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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux Socket Filter - Kernel level socket filtering | |
4 | * | |
bd4cf0ed AS |
5 | * Based on the design of the Berkeley Packet Filter. The new |
6 | * internal format has been designed by PLUMgrid: | |
1da177e4 | 7 | * |
bd4cf0ed AS |
8 | * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com |
9 | * | |
10 | * Authors: | |
11 | * | |
12 | * Jay Schulist <jschlst@samba.org> | |
13 | * Alexei Starovoitov <ast@plumgrid.com> | |
14 | * Daniel Borkmann <dborkman@redhat.com> | |
1da177e4 | 15 | * |
1da177e4 | 16 | * Andi Kleen - Fix a few bad bugs and races. |
4df95ff4 | 17 | * Kris Katterjohn - Added many additional checks in bpf_check_classic() |
1da177e4 LT |
18 | */ |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/types.h> | |
1da177e4 LT |
22 | #include <linux/mm.h> |
23 | #include <linux/fcntl.h> | |
24 | #include <linux/socket.h> | |
91b8270f | 25 | #include <linux/sock_diag.h> |
1da177e4 LT |
26 | #include <linux/in.h> |
27 | #include <linux/inet.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/if_packet.h> | |
c491680f | 30 | #include <linux/if_arp.h> |
5a0e3ad6 | 31 | #include <linux/gfp.h> |
d74bad4e | 32 | #include <net/inet_common.h> |
1da177e4 LT |
33 | #include <net/ip.h> |
34 | #include <net/protocol.h> | |
4738c1db | 35 | #include <net/netlink.h> |
1da177e4 | 36 | #include <linux/skbuff.h> |
604326b4 | 37 | #include <linux/skmsg.h> |
1da177e4 | 38 | #include <net/sock.h> |
10b89ee4 | 39 | #include <net/flow_dissector.h> |
1da177e4 LT |
40 | #include <linux/errno.h> |
41 | #include <linux/timer.h> | |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
40daafc8 | 43 | #include <asm/unaligned.h> |
d66f2b91 | 44 | #include <asm/cmpxchg.h> |
1da177e4 | 45 | #include <linux/filter.h> |
86e4ca66 | 46 | #include <linux/ratelimit.h> |
46b325c7 | 47 | #include <linux/seccomp.h> |
f3335031 | 48 | #include <linux/if_vlan.h> |
89aa0758 | 49 | #include <linux/bpf.h> |
d691f9e8 | 50 | #include <net/sch_generic.h> |
8d20aabe | 51 | #include <net/cls_cgroup.h> |
d3aa45ce | 52 | #include <net/dst_metadata.h> |
c46646d0 | 53 | #include <net/dst.h> |
538950a1 | 54 | #include <net/sock_reuseport.h> |
b1d9fc41 | 55 | #include <net/busy_poll.h> |
8c4b4c7e | 56 | #include <net/tcp.h> |
12bed760 | 57 | #include <net/xfrm.h> |
6acc9b43 | 58 | #include <net/udp.h> |
5acaee0a | 59 | #include <linux/bpf_trace.h> |
02671e23 | 60 | #include <net/xdp_sock.h> |
87f5fc7e | 61 | #include <linux/inetdevice.h> |
6acc9b43 JS |
62 | #include <net/inet_hashtables.h> |
63 | #include <net/inet6_hashtables.h> | |
87f5fc7e | 64 | #include <net/ip_fib.h> |
5481d73f | 65 | #include <net/nexthop.h> |
87f5fc7e DA |
66 | #include <net/flow.h> |
67 | #include <net/arp.h> | |
fe94cc29 | 68 | #include <net/ipv6.h> |
6acc9b43 | 69 | #include <net/net_namespace.h> |
fe94cc29 MX |
70 | #include <linux/seg6_local.h> |
71 | #include <net/seg6.h> | |
72 | #include <net/seg6_local.h> | |
52f27877 | 73 | #include <net/lwtunnel.h> |
3616d08b | 74 | #include <net/ipv6_stubs.h> |
6ac99e8f | 75 | #include <net/bpf_sk_storage.h> |
1da177e4 | 76 | |
43db6d65 | 77 | /** |
f4979fce | 78 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
79 | * @sk: sock associated with &sk_buff |
80 | * @skb: buffer to filter | |
f4979fce | 81 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 82 | * |
ff936a04 AS |
83 | * Run the eBPF program and then cut skb->data to correct size returned by |
84 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 85 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 86 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
87 | * be accepted or -EPERM if the packet should be tossed. |
88 | * | |
89 | */ | |
f4979fce | 90 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
91 | { |
92 | int err; | |
93 | struct sk_filter *filter; | |
94 | ||
c93bdd0e MG |
95 | /* |
96 | * If the skb was allocated from pfmemalloc reserves, only | |
97 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
98 | * helping free memory | |
99 | */ | |
8fe809a9 ED |
100 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
101 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 102 | return -ENOMEM; |
8fe809a9 | 103 | } |
c11cd3a6 DM |
104 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
105 | if (err) | |
106 | return err; | |
107 | ||
43db6d65 SH |
108 | err = security_sock_rcv_skb(sk, skb); |
109 | if (err) | |
110 | return err; | |
111 | ||
80f8f102 ED |
112 | rcu_read_lock(); |
113 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 114 | if (filter) { |
8f917bba WB |
115 | struct sock *save_sk = skb->sk; |
116 | unsigned int pkt_len; | |
117 | ||
118 | skb->sk = sk; | |
119 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 120 | skb->sk = save_sk; |
d1f496fd | 121 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 122 | } |
80f8f102 | 123 | rcu_read_unlock(); |
43db6d65 SH |
124 | |
125 | return err; | |
126 | } | |
f4979fce | 127 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 128 | |
b390134c | 129 | BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 130 | { |
f3694e00 | 131 | return skb_get_poff(skb); |
bd4cf0ed AS |
132 | } |
133 | ||
b390134c | 134 | BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 135 | { |
bd4cf0ed AS |
136 | struct nlattr *nla; |
137 | ||
138 | if (skb_is_nonlinear(skb)) | |
139 | return 0; | |
140 | ||
05ab8f26 MK |
141 | if (skb->len < sizeof(struct nlattr)) |
142 | return 0; | |
143 | ||
30743837 | 144 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
145 | return 0; |
146 | ||
30743837 | 147 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
148 | if (nla) |
149 | return (void *) nla - (void *) skb->data; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
b390134c | 154 | BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 155 | { |
bd4cf0ed AS |
156 | struct nlattr *nla; |
157 | ||
158 | if (skb_is_nonlinear(skb)) | |
159 | return 0; | |
160 | ||
05ab8f26 MK |
161 | if (skb->len < sizeof(struct nlattr)) |
162 | return 0; | |
163 | ||
30743837 | 164 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
165 | return 0; |
166 | ||
30743837 DB |
167 | nla = (struct nlattr *) &skb->data[a]; |
168 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
169 | return 0; |
170 | ||
30743837 | 171 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
172 | if (nla) |
173 | return (void *) nla - (void *) skb->data; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
e0cea7ce DB |
178 | BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, |
179 | data, int, headlen, int, offset) | |
180 | { | |
181 | u8 tmp, *ptr; | |
182 | const int len = sizeof(tmp); | |
183 | ||
184 | if (offset >= 0) { | |
185 | if (headlen - offset >= len) | |
186 | return *(u8 *)(data + offset); | |
187 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
188 | return tmp; | |
189 | } else { | |
190 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
191 | if (likely(ptr)) | |
192 | return *(u8 *)ptr; | |
193 | } | |
194 | ||
195 | return -EFAULT; | |
196 | } | |
197 | ||
198 | BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, | |
199 | int, offset) | |
200 | { | |
201 | return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, | |
202 | offset); | |
203 | } | |
204 | ||
205 | BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, | |
206 | data, int, headlen, int, offset) | |
207 | { | |
208 | u16 tmp, *ptr; | |
209 | const int len = sizeof(tmp); | |
210 | ||
211 | if (offset >= 0) { | |
212 | if (headlen - offset >= len) | |
213 | return get_unaligned_be16(data + offset); | |
214 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
215 | return be16_to_cpu(tmp); | |
216 | } else { | |
217 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
218 | if (likely(ptr)) | |
219 | return get_unaligned_be16(ptr); | |
220 | } | |
221 | ||
222 | return -EFAULT; | |
223 | } | |
224 | ||
225 | BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, | |
226 | int, offset) | |
227 | { | |
228 | return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, | |
229 | offset); | |
230 | } | |
231 | ||
232 | BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, | |
233 | data, int, headlen, int, offset) | |
234 | { | |
235 | u32 tmp, *ptr; | |
236 | const int len = sizeof(tmp); | |
237 | ||
238 | if (likely(offset >= 0)) { | |
239 | if (headlen - offset >= len) | |
240 | return get_unaligned_be32(data + offset); | |
241 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
242 | return be32_to_cpu(tmp); | |
243 | } else { | |
244 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
245 | if (likely(ptr)) | |
246 | return get_unaligned_be32(ptr); | |
247 | } | |
248 | ||
249 | return -EFAULT; | |
250 | } | |
251 | ||
252 | BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, | |
253 | int, offset) | |
254 | { | |
255 | return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, | |
256 | offset); | |
257 | } | |
258 | ||
b390134c | 259 | BPF_CALL_0(bpf_get_raw_cpu_id) |
bd4cf0ed AS |
260 | { |
261 | return raw_smp_processor_id(); | |
262 | } | |
263 | ||
80b48c44 | 264 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
b390134c | 265 | .func = bpf_get_raw_cpu_id, |
80b48c44 DB |
266 | .gpl_only = false, |
267 | .ret_type = RET_INTEGER, | |
268 | }; | |
269 | ||
9bac3d6d AS |
270 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
271 | struct bpf_insn *insn_buf) | |
272 | { | |
273 | struct bpf_insn *insn = insn_buf; | |
274 | ||
275 | switch (skb_field) { | |
276 | case SKF_AD_MARK: | |
c593642c | 277 | BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); |
9bac3d6d AS |
278 | |
279 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
280 | offsetof(struct sk_buff, mark)); | |
281 | break; | |
282 | ||
283 | case SKF_AD_PKTTYPE: | |
284 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
285 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
286 | #ifdef __BIG_ENDIAN_BITFIELD | |
287 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
288 | #endif | |
289 | break; | |
290 | ||
291 | case SKF_AD_QUEUE: | |
c593642c | 292 | BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); |
9bac3d6d AS |
293 | |
294 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
295 | offsetof(struct sk_buff, queue_mapping)); | |
296 | break; | |
c2497395 | 297 | |
c2497395 | 298 | case SKF_AD_VLAN_TAG: |
c593642c | 299 | BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); |
c2497395 AS |
300 | |
301 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
302 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
303 | offsetof(struct sk_buff, vlan_tci)); | |
9c212255 MM |
304 | break; |
305 | case SKF_AD_VLAN_TAG_PRESENT: | |
306 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); | |
307 | if (PKT_VLAN_PRESENT_BIT) | |
308 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); | |
309 | if (PKT_VLAN_PRESENT_BIT < 7) | |
c2497395 | 310 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); |
c2497395 | 311 | break; |
9bac3d6d AS |
312 | } |
313 | ||
314 | return insn - insn_buf; | |
315 | } | |
316 | ||
bd4cf0ed | 317 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 318 | struct bpf_insn **insnp) |
bd4cf0ed | 319 | { |
2695fb55 | 320 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 321 | u32 cnt; |
bd4cf0ed AS |
322 | |
323 | switch (fp->k) { | |
324 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
c593642c | 325 | BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); |
0b8c707d DB |
326 | |
327 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
328 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
329 | offsetof(struct sk_buff, protocol)); | |
330 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
331 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
332 | break; |
333 | ||
334 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
335 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
336 | insn += cnt - 1; | |
bd4cf0ed AS |
337 | break; |
338 | ||
339 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
340 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
c593642c PB |
341 | BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); |
342 | BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); | |
f8f6d679 | 343 | |
f035a515 | 344 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
345 | BPF_REG_TMP, BPF_REG_CTX, |
346 | offsetof(struct sk_buff, dev)); | |
347 | /* if (tmp != 0) goto pc + 1 */ | |
348 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
349 | *insn++ = BPF_EXIT_INSN(); | |
350 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
351 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
352 | offsetof(struct net_device, ifindex)); | |
353 | else | |
354 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
355 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
356 | break; |
357 | ||
358 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
359 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
360 | insn += cnt - 1; | |
bd4cf0ed AS |
361 | break; |
362 | ||
363 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
c593642c | 364 | BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); |
bd4cf0ed | 365 | |
9739eef1 AS |
366 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
367 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
368 | break; |
369 | ||
370 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
371 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
372 | insn += cnt - 1; | |
bd4cf0ed AS |
373 | break; |
374 | ||
375 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
376 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
377 | BPF_REG_A, BPF_REG_CTX, insn); | |
378 | insn += cnt - 1; | |
379 | break; | |
bd4cf0ed | 380 | |
c2497395 AS |
381 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
382 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
383 | BPF_REG_A, BPF_REG_CTX, insn); | |
384 | insn += cnt - 1; | |
bd4cf0ed AS |
385 | break; |
386 | ||
27cd5452 | 387 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
c593642c | 388 | BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); |
27cd5452 MS |
389 | |
390 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
391 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
392 | offsetof(struct sk_buff, vlan_proto)); | |
393 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
394 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
395 | break; | |
396 | ||
bd4cf0ed AS |
397 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
398 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
399 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
400 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 401 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 402 | /* arg1 = CTX */ |
f8f6d679 | 403 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 404 | /* arg2 = A */ |
f8f6d679 | 405 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 406 | /* arg3 = X */ |
f8f6d679 | 407 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 408 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
409 | switch (fp->k) { |
410 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
b390134c | 411 | *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); |
bd4cf0ed AS |
412 | break; |
413 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
b390134c | 414 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); |
bd4cf0ed AS |
415 | break; |
416 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
b390134c | 417 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); |
bd4cf0ed AS |
418 | break; |
419 | case SKF_AD_OFF + SKF_AD_CPU: | |
b390134c | 420 | *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); |
bd4cf0ed | 421 | break; |
4cd3675e | 422 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
423 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
424 | bpf_user_rnd_init_once(); | |
4cd3675e | 425 | break; |
bd4cf0ed AS |
426 | } |
427 | break; | |
428 | ||
429 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
430 | /* A ^= X */ |
431 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
432 | break; |
433 | ||
434 | default: | |
435 | /* This is just a dummy call to avoid letting the compiler | |
436 | * evict __bpf_call_base() as an optimization. Placed here | |
437 | * where no-one bothers. | |
438 | */ | |
439 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
440 | return false; | |
441 | } | |
442 | ||
443 | *insnp = insn; | |
444 | return true; | |
445 | } | |
446 | ||
e0cea7ce DB |
447 | static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) |
448 | { | |
449 | const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); | |
450 | int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); | |
451 | bool endian = BPF_SIZE(fp->code) == BPF_H || | |
452 | BPF_SIZE(fp->code) == BPF_W; | |
453 | bool indirect = BPF_MODE(fp->code) == BPF_IND; | |
454 | const int ip_align = NET_IP_ALIGN; | |
455 | struct bpf_insn *insn = *insnp; | |
456 | int offset = fp->k; | |
457 | ||
458 | if (!indirect && | |
459 | ((unaligned_ok && offset >= 0) || | |
460 | (!unaligned_ok && offset >= 0 && | |
461 | offset + ip_align >= 0 && | |
462 | offset + ip_align % size == 0))) { | |
59ee4129 DB |
463 | bool ldx_off_ok = offset <= S16_MAX; |
464 | ||
e0cea7ce | 465 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); |
d8f3e978 DM |
466 | if (offset) |
467 | *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); | |
59ee4129 DB |
468 | *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, |
469 | size, 2 + endian + (!ldx_off_ok * 2)); | |
470 | if (ldx_off_ok) { | |
471 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
472 | BPF_REG_D, offset); | |
473 | } else { | |
474 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); | |
475 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); | |
476 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
477 | BPF_REG_TMP, 0); | |
478 | } | |
e0cea7ce DB |
479 | if (endian) |
480 | *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); | |
481 | *insn++ = BPF_JMP_A(8); | |
482 | } | |
483 | ||
484 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); | |
485 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); | |
486 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); | |
487 | if (!indirect) { | |
488 | *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); | |
489 | } else { | |
490 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); | |
491 | if (fp->k) | |
492 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); | |
493 | } | |
494 | ||
495 | switch (BPF_SIZE(fp->code)) { | |
496 | case BPF_B: | |
497 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); | |
498 | break; | |
499 | case BPF_H: | |
500 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); | |
501 | break; | |
502 | case BPF_W: | |
503 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); | |
504 | break; | |
505 | default: | |
506 | return false; | |
507 | } | |
508 | ||
509 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); | |
510 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
511 | *insn = BPF_EXIT_INSN(); | |
512 | ||
513 | *insnp = insn; | |
514 | return true; | |
515 | } | |
516 | ||
bd4cf0ed | 517 | /** |
8fb575ca | 518 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
519 | * @prog: the user passed filter program |
520 | * @len: the length of the user passed filter program | |
50bbfed9 | 521 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed | 522 | * @new_len: pointer to store length of converted program |
e0cea7ce | 523 | * @seen_ld_abs: bool whether we've seen ld_abs/ind |
bd4cf0ed | 524 | * |
1f504ec9 TK |
525 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
526 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
527 | * Conversion workflow: |
528 | * | |
529 | * 1) First pass for calculating the new program length: | |
e0cea7ce | 530 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) |
bd4cf0ed AS |
531 | * |
532 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
533 | * jump offsets, 2nd pass remapping: | |
e0cea7ce | 534 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) |
bd4cf0ed | 535 | */ |
d9e12f42 | 536 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
e0cea7ce DB |
537 | struct bpf_prog *new_prog, int *new_len, |
538 | bool *seen_ld_abs) | |
bd4cf0ed | 539 | { |
50bbfed9 AS |
540 | int new_flen = 0, pass = 0, target, i, stack_off; |
541 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
542 | struct sock_filter *fp; |
543 | int *addrs = NULL; | |
544 | u8 bpf_src; | |
545 | ||
546 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 547 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 548 | |
6f9a093b | 549 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
550 | return -EINVAL; |
551 | ||
552 | if (new_prog) { | |
50bbfed9 | 553 | first_insn = new_prog->insnsi; |
658da937 DB |
554 | addrs = kcalloc(len, sizeof(*addrs), |
555 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
556 | if (!addrs) |
557 | return -ENOMEM; | |
558 | } | |
559 | ||
560 | do_pass: | |
50bbfed9 | 561 | new_insn = first_insn; |
bd4cf0ed AS |
562 | fp = prog; |
563 | ||
8b614aeb | 564 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 565 | if (new_prog) { |
8b614aeb DB |
566 | /* Classic BPF expects A and X to be reset first. These need |
567 | * to be guaranteed to be the first two instructions. | |
568 | */ | |
1d621674 DB |
569 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
570 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
8b614aeb DB |
571 | |
572 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
573 | * In eBPF case it's done by the compiler, here we need to | |
574 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
575 | */ | |
576 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
e0cea7ce DB |
577 | if (*seen_ld_abs) { |
578 | /* For packet access in classic BPF, cache skb->data | |
579 | * in callee-saved BPF R8 and skb->len - skb->data_len | |
580 | * (headlen) in BPF R9. Since classic BPF is read-only | |
581 | * on CTX, we only need to cache it once. | |
582 | */ | |
583 | *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), | |
584 | BPF_REG_D, BPF_REG_CTX, | |
585 | offsetof(struct sk_buff, data)); | |
586 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, | |
587 | offsetof(struct sk_buff, len)); | |
588 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, | |
589 | offsetof(struct sk_buff, data_len)); | |
590 | *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); | |
591 | } | |
8b614aeb DB |
592 | } else { |
593 | new_insn += 3; | |
594 | } | |
bd4cf0ed AS |
595 | |
596 | for (i = 0; i < len; fp++, i++) { | |
e0cea7ce | 597 | struct bpf_insn tmp_insns[32] = { }; |
2695fb55 | 598 | struct bpf_insn *insn = tmp_insns; |
bd4cf0ed AS |
599 | |
600 | if (addrs) | |
50bbfed9 | 601 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
602 | |
603 | switch (fp->code) { | |
604 | /* All arithmetic insns and skb loads map as-is. */ | |
605 | case BPF_ALU | BPF_ADD | BPF_X: | |
606 | case BPF_ALU | BPF_ADD | BPF_K: | |
607 | case BPF_ALU | BPF_SUB | BPF_X: | |
608 | case BPF_ALU | BPF_SUB | BPF_K: | |
609 | case BPF_ALU | BPF_AND | BPF_X: | |
610 | case BPF_ALU | BPF_AND | BPF_K: | |
611 | case BPF_ALU | BPF_OR | BPF_X: | |
612 | case BPF_ALU | BPF_OR | BPF_K: | |
613 | case BPF_ALU | BPF_LSH | BPF_X: | |
614 | case BPF_ALU | BPF_LSH | BPF_K: | |
615 | case BPF_ALU | BPF_RSH | BPF_X: | |
616 | case BPF_ALU | BPF_RSH | BPF_K: | |
617 | case BPF_ALU | BPF_XOR | BPF_X: | |
618 | case BPF_ALU | BPF_XOR | BPF_K: | |
619 | case BPF_ALU | BPF_MUL | BPF_X: | |
620 | case BPF_ALU | BPF_MUL | BPF_K: | |
621 | case BPF_ALU | BPF_DIV | BPF_X: | |
622 | case BPF_ALU | BPF_DIV | BPF_K: | |
623 | case BPF_ALU | BPF_MOD | BPF_X: | |
624 | case BPF_ALU | BPF_MOD | BPF_K: | |
625 | case BPF_ALU | BPF_NEG: | |
626 | case BPF_LD | BPF_ABS | BPF_W: | |
627 | case BPF_LD | BPF_ABS | BPF_H: | |
628 | case BPF_LD | BPF_ABS | BPF_B: | |
629 | case BPF_LD | BPF_IND | BPF_W: | |
630 | case BPF_LD | BPF_IND | BPF_H: | |
631 | case BPF_LD | BPF_IND | BPF_B: | |
632 | /* Check for overloaded BPF extension and | |
633 | * directly convert it if found, otherwise | |
634 | * just move on with mapping. | |
635 | */ | |
636 | if (BPF_CLASS(fp->code) == BPF_LD && | |
637 | BPF_MODE(fp->code) == BPF_ABS && | |
638 | convert_bpf_extensions(fp, &insn)) | |
639 | break; | |
e0cea7ce DB |
640 | if (BPF_CLASS(fp->code) == BPF_LD && |
641 | convert_bpf_ld_abs(fp, &insn)) { | |
642 | *seen_ld_abs = true; | |
643 | break; | |
644 | } | |
bd4cf0ed | 645 | |
68fda450 | 646 | if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || |
f6b1b3bf | 647 | fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { |
68fda450 | 648 | *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); |
f6b1b3bf DB |
649 | /* Error with exception code on div/mod by 0. |
650 | * For cBPF programs, this was always return 0. | |
651 | */ | |
652 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); | |
653 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
654 | *insn++ = BPF_EXIT_INSN(); | |
655 | } | |
68fda450 | 656 | |
f8f6d679 | 657 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
658 | break; |
659 | ||
f8f6d679 DB |
660 | /* Jump transformation cannot use BPF block macros |
661 | * everywhere as offset calculation and target updates | |
662 | * require a bit more work than the rest, i.e. jump | |
663 | * opcodes map as-is, but offsets need adjustment. | |
664 | */ | |
665 | ||
666 | #define BPF_EMIT_JMP \ | |
bd4cf0ed | 667 | do { \ |
050fad7c DB |
668 | const s32 off_min = S16_MIN, off_max = S16_MAX; \ |
669 | s32 off; \ | |
670 | \ | |
bd4cf0ed AS |
671 | if (target >= len || target < 0) \ |
672 | goto err; \ | |
050fad7c | 673 | off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ |
bd4cf0ed | 674 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ |
050fad7c DB |
675 | off -= insn - tmp_insns; \ |
676 | /* Reject anything not fitting into insn->off. */ \ | |
677 | if (off < off_min || off > off_max) \ | |
678 | goto err; \ | |
679 | insn->off = off; \ | |
bd4cf0ed AS |
680 | } while (0) |
681 | ||
f8f6d679 DB |
682 | case BPF_JMP | BPF_JA: |
683 | target = i + fp->k + 1; | |
684 | insn->code = fp->code; | |
685 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
686 | break; |
687 | ||
688 | case BPF_JMP | BPF_JEQ | BPF_K: | |
689 | case BPF_JMP | BPF_JEQ | BPF_X: | |
690 | case BPF_JMP | BPF_JSET | BPF_K: | |
691 | case BPF_JMP | BPF_JSET | BPF_X: | |
692 | case BPF_JMP | BPF_JGT | BPF_K: | |
693 | case BPF_JMP | BPF_JGT | BPF_X: | |
694 | case BPF_JMP | BPF_JGE | BPF_K: | |
695 | case BPF_JMP | BPF_JGE | BPF_X: | |
696 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
697 | /* BPF immediates are signed, zero extend | |
698 | * immediate into tmp register and use it | |
699 | * in compare insn. | |
700 | */ | |
f8f6d679 | 701 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 702 | |
e430f34e AS |
703 | insn->dst_reg = BPF_REG_A; |
704 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
705 | bpf_src = BPF_X; |
706 | } else { | |
e430f34e | 707 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
708 | insn->imm = fp->k; |
709 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 710 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 711 | } |
bd4cf0ed AS |
712 | |
713 | /* Common case where 'jump_false' is next insn. */ | |
714 | if (fp->jf == 0) { | |
715 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
716 | target = i + fp->jt + 1; | |
f8f6d679 | 717 | BPF_EMIT_JMP; |
bd4cf0ed | 718 | break; |
1da177e4 | 719 | } |
bd4cf0ed | 720 | |
92b31a9a DB |
721 | /* Convert some jumps when 'jump_true' is next insn. */ |
722 | if (fp->jt == 0) { | |
723 | switch (BPF_OP(fp->code)) { | |
724 | case BPF_JEQ: | |
725 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
726 | break; | |
727 | case BPF_JGT: | |
728 | insn->code = BPF_JMP | BPF_JLE | bpf_src; | |
729 | break; | |
730 | case BPF_JGE: | |
731 | insn->code = BPF_JMP | BPF_JLT | bpf_src; | |
732 | break; | |
733 | default: | |
734 | goto jmp_rest; | |
735 | } | |
736 | ||
bd4cf0ed | 737 | target = i + fp->jf + 1; |
f8f6d679 | 738 | BPF_EMIT_JMP; |
bd4cf0ed | 739 | break; |
0b05b2a4 | 740 | } |
92b31a9a | 741 | jmp_rest: |
bd4cf0ed AS |
742 | /* Other jumps are mapped into two insns: Jxx and JA. */ |
743 | target = i + fp->jt + 1; | |
744 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 745 | BPF_EMIT_JMP; |
bd4cf0ed AS |
746 | insn++; |
747 | ||
748 | insn->code = BPF_JMP | BPF_JA; | |
749 | target = i + fp->jf + 1; | |
f8f6d679 | 750 | BPF_EMIT_JMP; |
bd4cf0ed AS |
751 | break; |
752 | ||
753 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
e0cea7ce DB |
754 | case BPF_LDX | BPF_MSH | BPF_B: { |
755 | struct sock_filter tmp = { | |
756 | .code = BPF_LD | BPF_ABS | BPF_B, | |
757 | .k = fp->k, | |
758 | }; | |
759 | ||
760 | *seen_ld_abs = true; | |
761 | ||
762 | /* X = A */ | |
763 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); | |
1268e253 | 764 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
e0cea7ce DB |
765 | convert_bpf_ld_abs(&tmp, &insn); |
766 | insn++; | |
9739eef1 | 767 | /* A &= 0xf */ |
f8f6d679 | 768 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 769 | /* A <<= 2 */ |
f8f6d679 | 770 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
e0cea7ce DB |
771 | /* tmp = X */ |
772 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); | |
9739eef1 | 773 | /* X = A */ |
f8f6d679 | 774 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 775 | /* A = tmp */ |
f8f6d679 | 776 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed | 777 | break; |
e0cea7ce | 778 | } |
6205b9cf DB |
779 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
780 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
781 | */ | |
bd4cf0ed AS |
782 | case BPF_RET | BPF_A: |
783 | case BPF_RET | BPF_K: | |
6205b9cf DB |
784 | if (BPF_RVAL(fp->code) == BPF_K) |
785 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
786 | 0, fp->k); | |
9739eef1 | 787 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
788 | break; |
789 | ||
790 | /* Store to stack. */ | |
791 | case BPF_ST: | |
792 | case BPF_STX: | |
50bbfed9 | 793 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
794 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
795 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
796 | -stack_off); |
797 | /* check_load_and_stores() verifies that classic BPF can | |
798 | * load from stack only after write, so tracking | |
799 | * stack_depth for ST|STX insns is enough | |
800 | */ | |
801 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
802 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
803 | break; |
804 | ||
805 | /* Load from stack. */ | |
806 | case BPF_LD | BPF_MEM: | |
807 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 808 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
809 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
810 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 811 | -stack_off); |
bd4cf0ed AS |
812 | break; |
813 | ||
814 | /* A = K or X = K */ | |
815 | case BPF_LD | BPF_IMM: | |
816 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
817 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
818 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
819 | break; |
820 | ||
821 | /* X = A */ | |
822 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 823 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
824 | break; |
825 | ||
826 | /* A = X */ | |
827 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 828 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
829 | break; |
830 | ||
831 | /* A = skb->len or X = skb->len */ | |
832 | case BPF_LD | BPF_W | BPF_LEN: | |
833 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
834 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
835 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
836 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
837 | break; |
838 | ||
f8f6d679 | 839 | /* Access seccomp_data fields. */ |
bd4cf0ed | 840 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
841 | /* A = *(u32 *) (ctx + K) */ |
842 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
843 | break; |
844 | ||
ca9f1fd2 | 845 | /* Unknown instruction. */ |
1da177e4 | 846 | default: |
bd4cf0ed | 847 | goto err; |
1da177e4 | 848 | } |
bd4cf0ed AS |
849 | |
850 | insn++; | |
851 | if (new_prog) | |
852 | memcpy(new_insn, tmp_insns, | |
853 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 854 | new_insn += insn - tmp_insns; |
1da177e4 LT |
855 | } |
856 | ||
bd4cf0ed AS |
857 | if (!new_prog) { |
858 | /* Only calculating new length. */ | |
50bbfed9 | 859 | *new_len = new_insn - first_insn; |
e0cea7ce DB |
860 | if (*seen_ld_abs) |
861 | *new_len += 4; /* Prologue bits. */ | |
bd4cf0ed AS |
862 | return 0; |
863 | } | |
864 | ||
865 | pass++; | |
50bbfed9 AS |
866 | if (new_flen != new_insn - first_insn) { |
867 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
868 | if (pass > 2) |
869 | goto err; | |
bd4cf0ed AS |
870 | goto do_pass; |
871 | } | |
872 | ||
873 | kfree(addrs); | |
874 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 875 | return 0; |
bd4cf0ed AS |
876 | err: |
877 | kfree(addrs); | |
878 | return -EINVAL; | |
1da177e4 LT |
879 | } |
880 | ||
bd4cf0ed | 881 | /* Security: |
bd4cf0ed | 882 | * |
2d5311e4 | 883 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 884 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 885 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 886 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 887 | */ |
ec31a05c | 888 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 889 | { |
34805931 | 890 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
891 | int pc, ret = 0; |
892 | ||
893 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 894 | |
99e72a0f | 895 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
896 | if (!masks) |
897 | return -ENOMEM; | |
34805931 | 898 | |
2d5311e4 ED |
899 | memset(masks, 0xff, flen * sizeof(*masks)); |
900 | ||
901 | for (pc = 0; pc < flen; pc++) { | |
902 | memvalid &= masks[pc]; | |
903 | ||
904 | switch (filter[pc].code) { | |
34805931 DB |
905 | case BPF_ST: |
906 | case BPF_STX: | |
2d5311e4 ED |
907 | memvalid |= (1 << filter[pc].k); |
908 | break; | |
34805931 DB |
909 | case BPF_LD | BPF_MEM: |
910 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
911 | if (!(memvalid & (1 << filter[pc].k))) { |
912 | ret = -EINVAL; | |
913 | goto error; | |
914 | } | |
915 | break; | |
34805931 DB |
916 | case BPF_JMP | BPF_JA: |
917 | /* A jump must set masks on target */ | |
2d5311e4 ED |
918 | masks[pc + 1 + filter[pc].k] &= memvalid; |
919 | memvalid = ~0; | |
920 | break; | |
34805931 DB |
921 | case BPF_JMP | BPF_JEQ | BPF_K: |
922 | case BPF_JMP | BPF_JEQ | BPF_X: | |
923 | case BPF_JMP | BPF_JGE | BPF_K: | |
924 | case BPF_JMP | BPF_JGE | BPF_X: | |
925 | case BPF_JMP | BPF_JGT | BPF_K: | |
926 | case BPF_JMP | BPF_JGT | BPF_X: | |
927 | case BPF_JMP | BPF_JSET | BPF_K: | |
928 | case BPF_JMP | BPF_JSET | BPF_X: | |
929 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
930 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
931 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
932 | memvalid = ~0; | |
933 | break; | |
934 | } | |
935 | } | |
936 | error: | |
937 | kfree(masks); | |
938 | return ret; | |
939 | } | |
940 | ||
34805931 DB |
941 | static bool chk_code_allowed(u16 code_to_probe) |
942 | { | |
943 | static const bool codes[] = { | |
944 | /* 32 bit ALU operations */ | |
945 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
946 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
947 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
948 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
949 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
950 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
951 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
952 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
953 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
954 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
955 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
956 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
957 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
958 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
959 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
960 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
961 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
962 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
963 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
964 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
965 | [BPF_ALU | BPF_NEG] = true, | |
966 | /* Load instructions */ | |
967 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
968 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
969 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
970 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
971 | [BPF_LD | BPF_W | BPF_IND] = true, | |
972 | [BPF_LD | BPF_H | BPF_IND] = true, | |
973 | [BPF_LD | BPF_B | BPF_IND] = true, | |
974 | [BPF_LD | BPF_IMM] = true, | |
975 | [BPF_LD | BPF_MEM] = true, | |
976 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
977 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
978 | [BPF_LDX | BPF_IMM] = true, | |
979 | [BPF_LDX | BPF_MEM] = true, | |
980 | /* Store instructions */ | |
981 | [BPF_ST] = true, | |
982 | [BPF_STX] = true, | |
983 | /* Misc instructions */ | |
984 | [BPF_MISC | BPF_TAX] = true, | |
985 | [BPF_MISC | BPF_TXA] = true, | |
986 | /* Return instructions */ | |
987 | [BPF_RET | BPF_K] = true, | |
988 | [BPF_RET | BPF_A] = true, | |
989 | /* Jump instructions */ | |
990 | [BPF_JMP | BPF_JA] = true, | |
991 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
992 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
993 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
994 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
995 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
996 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
997 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
998 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
999 | }; | |
1000 | ||
1001 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
1002 | return false; | |
1003 | ||
1004 | return codes[code_to_probe]; | |
1005 | } | |
1006 | ||
f7bd9e36 DB |
1007 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
1008 | unsigned int flen) | |
1009 | { | |
1010 | if (filter == NULL) | |
1011 | return false; | |
1012 | if (flen == 0 || flen > BPF_MAXINSNS) | |
1013 | return false; | |
1014 | ||
1015 | return true; | |
1016 | } | |
1017 | ||
1da177e4 | 1018 | /** |
4df95ff4 | 1019 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
1020 | * @filter: filter to verify |
1021 | * @flen: length of filter | |
1022 | * | |
1023 | * Check the user's filter code. If we let some ugly | |
1024 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
1025 | * no references or jumps that are out of range, no illegal |
1026 | * instructions, and must end with a RET instruction. | |
1da177e4 | 1027 | * |
7b11f69f KK |
1028 | * All jumps are forward as they are not signed. |
1029 | * | |
1030 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 1031 | */ |
d9e12f42 NS |
1032 | static int bpf_check_classic(const struct sock_filter *filter, |
1033 | unsigned int flen) | |
1da177e4 | 1034 | { |
aa1113d9 | 1035 | bool anc_found; |
34805931 | 1036 | int pc; |
1da177e4 | 1037 | |
34805931 | 1038 | /* Check the filter code now */ |
1da177e4 | 1039 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 1040 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 1041 | |
34805931 DB |
1042 | /* May we actually operate on this code? */ |
1043 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 1044 | return -EINVAL; |
34805931 | 1045 | |
93699863 | 1046 | /* Some instructions need special checks */ |
34805931 DB |
1047 | switch (ftest->code) { |
1048 | case BPF_ALU | BPF_DIV | BPF_K: | |
1049 | case BPF_ALU | BPF_MOD | BPF_K: | |
1050 | /* Check for division by zero */ | |
b6069a95 ED |
1051 | if (ftest->k == 0) |
1052 | return -EINVAL; | |
1053 | break; | |
229394e8 RV |
1054 | case BPF_ALU | BPF_LSH | BPF_K: |
1055 | case BPF_ALU | BPF_RSH | BPF_K: | |
1056 | if (ftest->k >= 32) | |
1057 | return -EINVAL; | |
1058 | break; | |
34805931 DB |
1059 | case BPF_LD | BPF_MEM: |
1060 | case BPF_LDX | BPF_MEM: | |
1061 | case BPF_ST: | |
1062 | case BPF_STX: | |
1063 | /* Check for invalid memory addresses */ | |
93699863 KK |
1064 | if (ftest->k >= BPF_MEMWORDS) |
1065 | return -EINVAL; | |
1066 | break; | |
34805931 DB |
1067 | case BPF_JMP | BPF_JA: |
1068 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
1069 | * Compare this with conditional jumps below, |
1070 | * where offsets are limited. --ANK (981016) | |
1071 | */ | |
34805931 | 1072 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 1073 | return -EINVAL; |
01f2f3f6 | 1074 | break; |
34805931 DB |
1075 | case BPF_JMP | BPF_JEQ | BPF_K: |
1076 | case BPF_JMP | BPF_JEQ | BPF_X: | |
1077 | case BPF_JMP | BPF_JGE | BPF_K: | |
1078 | case BPF_JMP | BPF_JGE | BPF_X: | |
1079 | case BPF_JMP | BPF_JGT | BPF_K: | |
1080 | case BPF_JMP | BPF_JGT | BPF_X: | |
1081 | case BPF_JMP | BPF_JSET | BPF_K: | |
1082 | case BPF_JMP | BPF_JSET | BPF_X: | |
1083 | /* Both conditionals must be safe */ | |
e35bedf3 | 1084 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
1085 | pc + ftest->jf + 1 >= flen) |
1086 | return -EINVAL; | |
cba328fc | 1087 | break; |
34805931 DB |
1088 | case BPF_LD | BPF_W | BPF_ABS: |
1089 | case BPF_LD | BPF_H | BPF_ABS: | |
1090 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 1091 | anc_found = false; |
34805931 DB |
1092 | if (bpf_anc_helper(ftest) & BPF_ANC) |
1093 | anc_found = true; | |
1094 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
1095 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
1096 | return -EINVAL; | |
01f2f3f6 HPP |
1097 | } |
1098 | } | |
93699863 | 1099 | |
34805931 | 1100 | /* Last instruction must be a RET code */ |
01f2f3f6 | 1101 | switch (filter[flen - 1].code) { |
34805931 DB |
1102 | case BPF_RET | BPF_K: |
1103 | case BPF_RET | BPF_A: | |
2d5311e4 | 1104 | return check_load_and_stores(filter, flen); |
cba328fc | 1105 | } |
34805931 | 1106 | |
cba328fc | 1107 | return -EINVAL; |
1da177e4 LT |
1108 | } |
1109 | ||
7ae457c1 AS |
1110 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
1111 | const struct sock_fprog *fprog) | |
a3ea269b | 1112 | { |
009937e7 | 1113 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
1114 | struct sock_fprog_kern *fkprog; |
1115 | ||
1116 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
1117 | if (!fp->orig_prog) | |
1118 | return -ENOMEM; | |
1119 | ||
1120 | fkprog = fp->orig_prog; | |
1121 | fkprog->len = fprog->len; | |
658da937 DB |
1122 | |
1123 | fkprog->filter = kmemdup(fp->insns, fsize, | |
1124 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
1125 | if (!fkprog->filter) { |
1126 | kfree(fp->orig_prog); | |
1127 | return -ENOMEM; | |
1128 | } | |
1129 | ||
1130 | return 0; | |
1131 | } | |
1132 | ||
7ae457c1 | 1133 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
1134 | { |
1135 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
1136 | ||
1137 | if (fprog) { | |
1138 | kfree(fprog->filter); | |
1139 | kfree(fprog); | |
1140 | } | |
1141 | } | |
1142 | ||
7ae457c1 AS |
1143 | static void __bpf_prog_release(struct bpf_prog *prog) |
1144 | { | |
24701ece | 1145 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
1146 | bpf_prog_put(prog); |
1147 | } else { | |
1148 | bpf_release_orig_filter(prog); | |
1149 | bpf_prog_free(prog); | |
1150 | } | |
7ae457c1 AS |
1151 | } |
1152 | ||
34c5bd66 PN |
1153 | static void __sk_filter_release(struct sk_filter *fp) |
1154 | { | |
7ae457c1 AS |
1155 | __bpf_prog_release(fp->prog); |
1156 | kfree(fp); | |
34c5bd66 PN |
1157 | } |
1158 | ||
47e958ea | 1159 | /** |
46bcf14f | 1160 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
1161 | * @rcu: rcu_head that contains the sk_filter to free |
1162 | */ | |
fbc907f0 | 1163 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
1164 | { |
1165 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
1166 | ||
34c5bd66 | 1167 | __sk_filter_release(fp); |
47e958ea | 1168 | } |
fbc907f0 DB |
1169 | |
1170 | /** | |
1171 | * sk_filter_release - release a socket filter | |
1172 | * @fp: filter to remove | |
1173 | * | |
1174 | * Remove a filter from a socket and release its resources. | |
1175 | */ | |
1176 | static void sk_filter_release(struct sk_filter *fp) | |
1177 | { | |
4c355cdf | 1178 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
1179 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
1180 | } | |
1181 | ||
1182 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1183 | { | |
7ae457c1 | 1184 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 1185 | |
278571ba AS |
1186 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
1187 | sk_filter_release(fp); | |
fbc907f0 | 1188 | } |
47e958ea | 1189 | |
278571ba AS |
1190 | /* try to charge the socket memory if there is space available |
1191 | * return true on success | |
1192 | */ | |
4c355cdf | 1193 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 1194 | { |
7ae457c1 | 1195 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
1196 | |
1197 | /* same check as in sock_kmalloc() */ | |
1198 | if (filter_size <= sysctl_optmem_max && | |
1199 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
1200 | atomic_add(filter_size, &sk->sk_omem_alloc); |
1201 | return true; | |
bd4cf0ed | 1202 | } |
278571ba | 1203 | return false; |
bd4cf0ed AS |
1204 | } |
1205 | ||
4c355cdf RE |
1206 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
1207 | { | |
eefca20e ED |
1208 | if (!refcount_inc_not_zero(&fp->refcnt)) |
1209 | return false; | |
1210 | ||
1211 | if (!__sk_filter_charge(sk, fp)) { | |
1212 | sk_filter_release(fp); | |
1213 | return false; | |
1214 | } | |
1215 | return true; | |
4c355cdf RE |
1216 | } |
1217 | ||
7ae457c1 | 1218 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
1219 | { |
1220 | struct sock_filter *old_prog; | |
7ae457c1 | 1221 | struct bpf_prog *old_fp; |
34805931 | 1222 | int err, new_len, old_len = fp->len; |
e0cea7ce | 1223 | bool seen_ld_abs = false; |
bd4cf0ed AS |
1224 | |
1225 | /* We are free to overwrite insns et al right here as it | |
1226 | * won't be used at this point in time anymore internally | |
1227 | * after the migration to the internal BPF instruction | |
1228 | * representation. | |
1229 | */ | |
1230 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 1231 | sizeof(struct bpf_insn)); |
bd4cf0ed | 1232 | |
bd4cf0ed AS |
1233 | /* Conversion cannot happen on overlapping memory areas, |
1234 | * so we need to keep the user BPF around until the 2nd | |
1235 | * pass. At this time, the user BPF is stored in fp->insns. | |
1236 | */ | |
1237 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1238 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1239 | if (!old_prog) { |
1240 | err = -ENOMEM; | |
1241 | goto out_err; | |
1242 | } | |
1243 | ||
1244 | /* 1st pass: calculate the new program length. */ | |
e0cea7ce DB |
1245 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, |
1246 | &seen_ld_abs); | |
bd4cf0ed AS |
1247 | if (err) |
1248 | goto out_err_free; | |
1249 | ||
1250 | /* Expand fp for appending the new filter representation. */ | |
1251 | old_fp = fp; | |
60a3b225 | 1252 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1253 | if (!fp) { |
1254 | /* The old_fp is still around in case we couldn't | |
1255 | * allocate new memory, so uncharge on that one. | |
1256 | */ | |
1257 | fp = old_fp; | |
1258 | err = -ENOMEM; | |
1259 | goto out_err_free; | |
1260 | } | |
1261 | ||
bd4cf0ed AS |
1262 | fp->len = new_len; |
1263 | ||
2695fb55 | 1264 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
e0cea7ce DB |
1265 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len, |
1266 | &seen_ld_abs); | |
bd4cf0ed | 1267 | if (err) |
8fb575ca | 1268 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1269 | * to allocate memory, remapping must succeed. Note, |
1270 | * that at this time old_fp has already been released | |
278571ba | 1271 | * by krealloc(). |
bd4cf0ed AS |
1272 | */ |
1273 | goto out_err_free; | |
1274 | ||
d1c55ab5 | 1275 | fp = bpf_prog_select_runtime(fp, &err); |
290af866 AS |
1276 | if (err) |
1277 | goto out_err_free; | |
5fe821a9 | 1278 | |
bd4cf0ed AS |
1279 | kfree(old_prog); |
1280 | return fp; | |
1281 | ||
1282 | out_err_free: | |
1283 | kfree(old_prog); | |
1284 | out_err: | |
7ae457c1 | 1285 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1286 | return ERR_PTR(err); |
1287 | } | |
1288 | ||
ac67eb2c DB |
1289 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1290 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1291 | { |
1292 | int err; | |
1293 | ||
bd4cf0ed | 1294 | fp->bpf_func = NULL; |
a91263d5 | 1295 | fp->jited = 0; |
302d6637 | 1296 | |
4df95ff4 | 1297 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1298 | if (err) { |
7ae457c1 | 1299 | __bpf_prog_release(fp); |
bd4cf0ed | 1300 | return ERR_PTR(err); |
418c96ac | 1301 | } |
302d6637 | 1302 | |
4ae92bc7 NS |
1303 | /* There might be additional checks and transformations |
1304 | * needed on classic filters, f.e. in case of seccomp. | |
1305 | */ | |
1306 | if (trans) { | |
1307 | err = trans(fp->insns, fp->len); | |
1308 | if (err) { | |
1309 | __bpf_prog_release(fp); | |
1310 | return ERR_PTR(err); | |
1311 | } | |
1312 | } | |
1313 | ||
bd4cf0ed AS |
1314 | /* Probe if we can JIT compile the filter and if so, do |
1315 | * the compilation of the filter. | |
1316 | */ | |
302d6637 | 1317 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1318 | |
1319 | /* JIT compiler couldn't process this filter, so do the | |
1320 | * internal BPF translation for the optimized interpreter. | |
1321 | */ | |
5fe821a9 | 1322 | if (!fp->jited) |
7ae457c1 | 1323 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1324 | |
1325 | return fp; | |
302d6637 JP |
1326 | } |
1327 | ||
1328 | /** | |
7ae457c1 | 1329 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1330 | * @pfp: the unattached filter that is created |
677a9fd3 | 1331 | * @fprog: the filter program |
302d6637 | 1332 | * |
c6c4b97c | 1333 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1334 | * sanity checks on it to make sure it does not explode on us later. |
1335 | * If an error occurs or there is insufficient memory for the filter | |
1336 | * a negative errno code is returned. On success the return is zero. | |
1337 | */ | |
7ae457c1 | 1338 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1339 | { |
009937e7 | 1340 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1341 | struct bpf_prog *fp; |
302d6637 JP |
1342 | |
1343 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1344 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1345 | return -EINVAL; |
1346 | ||
60a3b225 | 1347 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1348 | if (!fp) |
1349 | return -ENOMEM; | |
a3ea269b | 1350 | |
302d6637 JP |
1351 | memcpy(fp->insns, fprog->filter, fsize); |
1352 | ||
302d6637 | 1353 | fp->len = fprog->len; |
a3ea269b DB |
1354 | /* Since unattached filters are not copied back to user |
1355 | * space through sk_get_filter(), we do not need to hold | |
1356 | * a copy here, and can spare us the work. | |
1357 | */ | |
1358 | fp->orig_prog = NULL; | |
302d6637 | 1359 | |
7ae457c1 | 1360 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1361 | * memory in case something goes wrong. |
1362 | */ | |
4ae92bc7 | 1363 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1364 | if (IS_ERR(fp)) |
1365 | return PTR_ERR(fp); | |
302d6637 JP |
1366 | |
1367 | *pfp = fp; | |
1368 | return 0; | |
302d6637 | 1369 | } |
7ae457c1 | 1370 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1371 | |
ac67eb2c DB |
1372 | /** |
1373 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1374 | * @pfp: the unattached filter that is created | |
1375 | * @fprog: the filter program | |
1376 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1377 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1378 | * |
1379 | * This function effectively does the same as bpf_prog_create(), only | |
1380 | * that it builds up its insns buffer from user space provided buffer. | |
1381 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1382 | */ | |
1383 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1384 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1385 | { |
1386 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1387 | struct bpf_prog *fp; | |
bab18991 | 1388 | int err; |
ac67eb2c DB |
1389 | |
1390 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1391 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1392 | return -EINVAL; |
1393 | ||
1394 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1395 | if (!fp) | |
1396 | return -ENOMEM; | |
1397 | ||
1398 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1399 | __bpf_prog_free(fp); | |
1400 | return -EFAULT; | |
1401 | } | |
1402 | ||
1403 | fp->len = fprog->len; | |
ac67eb2c DB |
1404 | fp->orig_prog = NULL; |
1405 | ||
bab18991 DB |
1406 | if (save_orig) { |
1407 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1408 | if (err) { | |
1409 | __bpf_prog_free(fp); | |
1410 | return -ENOMEM; | |
1411 | } | |
1412 | } | |
1413 | ||
ac67eb2c DB |
1414 | /* bpf_prepare_filter() already takes care of freeing |
1415 | * memory in case something goes wrong. | |
1416 | */ | |
1417 | fp = bpf_prepare_filter(fp, trans); | |
1418 | if (IS_ERR(fp)) | |
1419 | return PTR_ERR(fp); | |
1420 | ||
1421 | *pfp = fp; | |
1422 | return 0; | |
1423 | } | |
2ea273d7 | 1424 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1425 | |
7ae457c1 | 1426 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1427 | { |
7ae457c1 | 1428 | __bpf_prog_release(fp); |
302d6637 | 1429 | } |
7ae457c1 | 1430 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1431 | |
8ced425e | 1432 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1433 | { |
1434 | struct sk_filter *fp, *old_fp; | |
1435 | ||
1436 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1437 | if (!fp) | |
1438 | return -ENOMEM; | |
1439 | ||
1440 | fp->prog = prog; | |
49b31e57 | 1441 | |
4c355cdf | 1442 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1443 | kfree(fp); |
1444 | return -ENOMEM; | |
1445 | } | |
4c355cdf | 1446 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1447 | |
8ced425e HFS |
1448 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1449 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1450 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1451 | |
49b31e57 DB |
1452 | if (old_fp) |
1453 | sk_filter_uncharge(sk, old_fp); | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
538950a1 CG |
1458 | static |
1459 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1460 | { |
009937e7 | 1461 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1462 | struct bpf_prog *prog; |
1da177e4 LT |
1463 | int err; |
1464 | ||
d59577b6 | 1465 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1466 | return ERR_PTR(-EPERM); |
d59577b6 | 1467 | |
1da177e4 | 1468 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1469 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1470 | return ERR_PTR(-EINVAL); |
1da177e4 | 1471 | |
f7bd9e36 | 1472 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1473 | if (!prog) |
538950a1 | 1474 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1475 | |
7ae457c1 | 1476 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1477 | __bpf_prog_free(prog); |
538950a1 | 1478 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1479 | } |
1480 | ||
7ae457c1 | 1481 | prog->len = fprog->len; |
1da177e4 | 1482 | |
7ae457c1 | 1483 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1484 | if (err) { |
c0d1379a | 1485 | __bpf_prog_free(prog); |
538950a1 | 1486 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1487 | } |
1488 | ||
7ae457c1 | 1489 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1490 | * memory in case something goes wrong. |
1491 | */ | |
538950a1 CG |
1492 | return bpf_prepare_filter(prog, NULL); |
1493 | } | |
1494 | ||
1495 | /** | |
1496 | * sk_attach_filter - attach a socket filter | |
1497 | * @fprog: the filter program | |
1498 | * @sk: the socket to use | |
1499 | * | |
1500 | * Attach the user's filter code. We first run some sanity checks on | |
1501 | * it to make sure it does not explode on us later. If an error | |
1502 | * occurs or there is insufficient memory for the filter a negative | |
1503 | * errno code is returned. On success the return is zero. | |
1504 | */ | |
8ced425e | 1505 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1506 | { |
1507 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1508 | int err; | |
1509 | ||
7ae457c1 AS |
1510 | if (IS_ERR(prog)) |
1511 | return PTR_ERR(prog); | |
1512 | ||
8ced425e | 1513 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1514 | if (err < 0) { |
7ae457c1 | 1515 | __bpf_prog_release(prog); |
49b31e57 | 1516 | return err; |
278571ba AS |
1517 | } |
1518 | ||
d3904b73 | 1519 | return 0; |
1da177e4 | 1520 | } |
8ced425e | 1521 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1522 | |
538950a1 | 1523 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1524 | { |
538950a1 | 1525 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1526 | int err; |
89aa0758 | 1527 | |
538950a1 CG |
1528 | if (IS_ERR(prog)) |
1529 | return PTR_ERR(prog); | |
1530 | ||
8217ca65 MKL |
1531 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) |
1532 | err = -ENOMEM; | |
1533 | else | |
1534 | err = reuseport_attach_prog(sk, prog); | |
1535 | ||
1536 | if (err) | |
538950a1 | 1537 | __bpf_prog_release(prog); |
538950a1 | 1538 | |
8217ca65 | 1539 | return err; |
538950a1 CG |
1540 | } |
1541 | ||
1542 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1543 | { | |
89aa0758 | 1544 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1545 | return ERR_PTR(-EPERM); |
89aa0758 | 1546 | |
113214be | 1547 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1548 | } |
1549 | ||
1550 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1551 | { | |
1552 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1553 | int err; | |
1554 | ||
1555 | if (IS_ERR(prog)) | |
1556 | return PTR_ERR(prog); | |
1557 | ||
8ced425e | 1558 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1559 | if (err < 0) { |
89aa0758 | 1560 | bpf_prog_put(prog); |
49b31e57 | 1561 | return err; |
89aa0758 AS |
1562 | } |
1563 | ||
89aa0758 AS |
1564 | return 0; |
1565 | } | |
1566 | ||
538950a1 CG |
1567 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1568 | { | |
8217ca65 | 1569 | struct bpf_prog *prog; |
538950a1 CG |
1570 | int err; |
1571 | ||
8217ca65 MKL |
1572 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
1573 | return -EPERM; | |
1574 | ||
1575 | prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); | |
45586c70 | 1576 | if (PTR_ERR(prog) == -EINVAL) |
8217ca65 | 1577 | prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); |
538950a1 CG |
1578 | if (IS_ERR(prog)) |
1579 | return PTR_ERR(prog); | |
1580 | ||
8217ca65 MKL |
1581 | if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { |
1582 | /* Like other non BPF_PROG_TYPE_SOCKET_FILTER | |
1583 | * bpf prog (e.g. sockmap). It depends on the | |
1584 | * limitation imposed by bpf_prog_load(). | |
1585 | * Hence, sysctl_optmem_max is not checked. | |
1586 | */ | |
1587 | if ((sk->sk_type != SOCK_STREAM && | |
1588 | sk->sk_type != SOCK_DGRAM) || | |
1589 | (sk->sk_protocol != IPPROTO_UDP && | |
1590 | sk->sk_protocol != IPPROTO_TCP) || | |
1591 | (sk->sk_family != AF_INET && | |
1592 | sk->sk_family != AF_INET6)) { | |
1593 | err = -ENOTSUPP; | |
1594 | goto err_prog_put; | |
1595 | } | |
1596 | } else { | |
1597 | /* BPF_PROG_TYPE_SOCKET_FILTER */ | |
1598 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) { | |
1599 | err = -ENOMEM; | |
1600 | goto err_prog_put; | |
1601 | } | |
538950a1 CG |
1602 | } |
1603 | ||
8217ca65 MKL |
1604 | err = reuseport_attach_prog(sk, prog); |
1605 | err_prog_put: | |
1606 | if (err) | |
1607 | bpf_prog_put(prog); | |
1608 | ||
1609 | return err; | |
1610 | } | |
1611 | ||
1612 | void sk_reuseport_prog_free(struct bpf_prog *prog) | |
1613 | { | |
1614 | if (!prog) | |
1615 | return; | |
1616 | ||
1617 | if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) | |
1618 | bpf_prog_put(prog); | |
1619 | else | |
1620 | bpf_prog_destroy(prog); | |
538950a1 CG |
1621 | } |
1622 | ||
21cafc1d DB |
1623 | struct bpf_scratchpad { |
1624 | union { | |
1625 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1626 | u8 buff[MAX_BPF_STACK]; | |
1627 | }; | |
1628 | }; | |
1629 | ||
1630 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1631 | |
5293efe6 DB |
1632 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1633 | unsigned int write_len) | |
1634 | { | |
1635 | return skb_ensure_writable(skb, write_len); | |
1636 | } | |
1637 | ||
db58ba45 AS |
1638 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1639 | unsigned int write_len) | |
1640 | { | |
5293efe6 | 1641 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1642 | |
6aaae2b6 | 1643 | bpf_compute_data_pointers(skb); |
db58ba45 AS |
1644 | return err; |
1645 | } | |
1646 | ||
36bbef52 DB |
1647 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1648 | { | |
1649 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1650 | } | |
1651 | ||
a2bfe6bf DB |
1652 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1653 | { | |
1654 | if (skb_at_tc_ingress(skb)) | |
1655 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1656 | } | |
1657 | ||
8065694e DB |
1658 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1659 | { | |
1660 | if (skb_at_tc_ingress(skb)) | |
1661 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1662 | } | |
1663 | ||
f3694e00 DB |
1664 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1665 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1666 | { |
608cd71a AS |
1667 | void *ptr; |
1668 | ||
8afd54c8 | 1669 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1670 | return -EINVAL; |
0ed661d5 | 1671 | if (unlikely(offset > 0xffff)) |
608cd71a | 1672 | return -EFAULT; |
db58ba45 | 1673 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1674 | return -EFAULT; |
1675 | ||
0ed661d5 | 1676 | ptr = skb->data + offset; |
781c53bc | 1677 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1678 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1679 | |
1680 | memcpy(ptr, from, len); | |
1681 | ||
781c53bc | 1682 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1683 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1684 | if (flags & BPF_F_INVALIDATE_HASH) |
1685 | skb_clear_hash(skb); | |
f8ffad69 | 1686 | |
608cd71a AS |
1687 | return 0; |
1688 | } | |
1689 | ||
577c50aa | 1690 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1691 | .func = bpf_skb_store_bytes, |
1692 | .gpl_only = false, | |
1693 | .ret_type = RET_INTEGER, | |
1694 | .arg1_type = ARG_PTR_TO_CTX, | |
1695 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1696 | .arg3_type = ARG_PTR_TO_MEM, |
1697 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1698 | .arg5_type = ARG_ANYTHING, |
1699 | }; | |
1700 | ||
f3694e00 DB |
1701 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1702 | void *, to, u32, len) | |
05c74e5e | 1703 | { |
05c74e5e DB |
1704 | void *ptr; |
1705 | ||
0ed661d5 | 1706 | if (unlikely(offset > 0xffff)) |
074f528e | 1707 | goto err_clear; |
05c74e5e DB |
1708 | |
1709 | ptr = skb_header_pointer(skb, offset, len, to); | |
1710 | if (unlikely(!ptr)) | |
074f528e | 1711 | goto err_clear; |
05c74e5e DB |
1712 | if (ptr != to) |
1713 | memcpy(to, ptr, len); | |
1714 | ||
1715 | return 0; | |
074f528e DB |
1716 | err_clear: |
1717 | memset(to, 0, len); | |
1718 | return -EFAULT; | |
05c74e5e DB |
1719 | } |
1720 | ||
577c50aa | 1721 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1722 | .func = bpf_skb_load_bytes, |
1723 | .gpl_only = false, | |
1724 | .ret_type = RET_INTEGER, | |
1725 | .arg1_type = ARG_PTR_TO_CTX, | |
1726 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1727 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1728 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1729 | }; |
1730 | ||
089b19a9 SF |
1731 | BPF_CALL_4(bpf_flow_dissector_load_bytes, |
1732 | const struct bpf_flow_dissector *, ctx, u32, offset, | |
1733 | void *, to, u32, len) | |
1734 | { | |
1735 | void *ptr; | |
1736 | ||
1737 | if (unlikely(offset > 0xffff)) | |
1738 | goto err_clear; | |
1739 | ||
1740 | if (unlikely(!ctx->skb)) | |
1741 | goto err_clear; | |
1742 | ||
1743 | ptr = skb_header_pointer(ctx->skb, offset, len, to); | |
1744 | if (unlikely(!ptr)) | |
1745 | goto err_clear; | |
1746 | if (ptr != to) | |
1747 | memcpy(to, ptr, len); | |
1748 | ||
1749 | return 0; | |
1750 | err_clear: | |
1751 | memset(to, 0, len); | |
1752 | return -EFAULT; | |
1753 | } | |
1754 | ||
1755 | static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { | |
1756 | .func = bpf_flow_dissector_load_bytes, | |
1757 | .gpl_only = false, | |
1758 | .ret_type = RET_INTEGER, | |
1759 | .arg1_type = ARG_PTR_TO_CTX, | |
1760 | .arg2_type = ARG_ANYTHING, | |
1761 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
1762 | .arg4_type = ARG_CONST_SIZE, | |
1763 | }; | |
1764 | ||
4e1ec56c DB |
1765 | BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, |
1766 | u32, offset, void *, to, u32, len, u32, start_header) | |
1767 | { | |
3eee1f75 DB |
1768 | u8 *end = skb_tail_pointer(skb); |
1769 | u8 *net = skb_network_header(skb); | |
1770 | u8 *mac = skb_mac_header(skb); | |
4e1ec56c DB |
1771 | u8 *ptr; |
1772 | ||
3eee1f75 | 1773 | if (unlikely(offset > 0xffff || len > (end - mac))) |
4e1ec56c DB |
1774 | goto err_clear; |
1775 | ||
1776 | switch (start_header) { | |
1777 | case BPF_HDR_START_MAC: | |
3eee1f75 | 1778 | ptr = mac + offset; |
4e1ec56c DB |
1779 | break; |
1780 | case BPF_HDR_START_NET: | |
3eee1f75 | 1781 | ptr = net + offset; |
4e1ec56c DB |
1782 | break; |
1783 | default: | |
1784 | goto err_clear; | |
1785 | } | |
1786 | ||
3eee1f75 | 1787 | if (likely(ptr >= mac && ptr + len <= end)) { |
4e1ec56c DB |
1788 | memcpy(to, ptr, len); |
1789 | return 0; | |
1790 | } | |
1791 | ||
1792 | err_clear: | |
1793 | memset(to, 0, len); | |
1794 | return -EFAULT; | |
1795 | } | |
1796 | ||
1797 | static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { | |
1798 | .func = bpf_skb_load_bytes_relative, | |
1799 | .gpl_only = false, | |
1800 | .ret_type = RET_INTEGER, | |
1801 | .arg1_type = ARG_PTR_TO_CTX, | |
1802 | .arg2_type = ARG_ANYTHING, | |
1803 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
1804 | .arg4_type = ARG_CONST_SIZE, | |
1805 | .arg5_type = ARG_ANYTHING, | |
1806 | }; | |
1807 | ||
36bbef52 DB |
1808 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1809 | { | |
1810 | /* Idea is the following: should the needed direct read/write | |
1811 | * test fail during runtime, we can pull in more data and redo | |
1812 | * again, since implicitly, we invalidate previous checks here. | |
1813 | * | |
1814 | * Or, since we know how much we need to make read/writeable, | |
1815 | * this can be done once at the program beginning for direct | |
1816 | * access case. By this we overcome limitations of only current | |
1817 | * headroom being accessible. | |
1818 | */ | |
1819 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1820 | } | |
1821 | ||
1822 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1823 | .func = bpf_skb_pull_data, | |
1824 | .gpl_only = false, | |
1825 | .ret_type = RET_INTEGER, | |
1826 | .arg1_type = ARG_PTR_TO_CTX, | |
1827 | .arg2_type = ARG_ANYTHING, | |
1828 | }; | |
1829 | ||
46f8bc92 MKL |
1830 | BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) |
1831 | { | |
46f8bc92 MKL |
1832 | return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; |
1833 | } | |
1834 | ||
1835 | static const struct bpf_func_proto bpf_sk_fullsock_proto = { | |
1836 | .func = bpf_sk_fullsock, | |
1837 | .gpl_only = false, | |
1838 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
1839 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, | |
1840 | }; | |
1841 | ||
0ea488ff JF |
1842 | static inline int sk_skb_try_make_writable(struct sk_buff *skb, |
1843 | unsigned int write_len) | |
1844 | { | |
1845 | int err = __bpf_try_make_writable(skb, write_len); | |
1846 | ||
1847 | bpf_compute_data_end_sk_skb(skb); | |
1848 | return err; | |
1849 | } | |
1850 | ||
1851 | BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) | |
1852 | { | |
1853 | /* Idea is the following: should the needed direct read/write | |
1854 | * test fail during runtime, we can pull in more data and redo | |
1855 | * again, since implicitly, we invalidate previous checks here. | |
1856 | * | |
1857 | * Or, since we know how much we need to make read/writeable, | |
1858 | * this can be done once at the program beginning for direct | |
1859 | * access case. By this we overcome limitations of only current | |
1860 | * headroom being accessible. | |
1861 | */ | |
1862 | return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1863 | } | |
1864 | ||
1865 | static const struct bpf_func_proto sk_skb_pull_data_proto = { | |
1866 | .func = sk_skb_pull_data, | |
1867 | .gpl_only = false, | |
1868 | .ret_type = RET_INTEGER, | |
1869 | .arg1_type = ARG_PTR_TO_CTX, | |
1870 | .arg2_type = ARG_ANYTHING, | |
1871 | }; | |
1872 | ||
f3694e00 DB |
1873 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1874 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1875 | { |
0ed661d5 | 1876 | __sum16 *ptr; |
91bc4822 | 1877 | |
781c53bc DB |
1878 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1879 | return -EINVAL; | |
0ed661d5 | 1880 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1881 | return -EFAULT; |
0ed661d5 | 1882 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1883 | return -EFAULT; |
1884 | ||
0ed661d5 | 1885 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1886 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1887 | case 0: |
1888 | if (unlikely(from != 0)) | |
1889 | return -EINVAL; | |
1890 | ||
1891 | csum_replace_by_diff(ptr, to); | |
1892 | break; | |
91bc4822 AS |
1893 | case 2: |
1894 | csum_replace2(ptr, from, to); | |
1895 | break; | |
1896 | case 4: | |
1897 | csum_replace4(ptr, from, to); | |
1898 | break; | |
1899 | default: | |
1900 | return -EINVAL; | |
1901 | } | |
1902 | ||
91bc4822 AS |
1903 | return 0; |
1904 | } | |
1905 | ||
577c50aa | 1906 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1907 | .func = bpf_l3_csum_replace, |
1908 | .gpl_only = false, | |
1909 | .ret_type = RET_INTEGER, | |
1910 | .arg1_type = ARG_PTR_TO_CTX, | |
1911 | .arg2_type = ARG_ANYTHING, | |
1912 | .arg3_type = ARG_ANYTHING, | |
1913 | .arg4_type = ARG_ANYTHING, | |
1914 | .arg5_type = ARG_ANYTHING, | |
1915 | }; | |
1916 | ||
f3694e00 DB |
1917 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1918 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1919 | { |
781c53bc | 1920 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1921 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1922 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1923 | __sum16 *ptr; |
91bc4822 | 1924 | |
d1b662ad DB |
1925 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1926 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1927 | return -EINVAL; |
0ed661d5 | 1928 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1929 | return -EFAULT; |
0ed661d5 | 1930 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1931 | return -EFAULT; |
1932 | ||
0ed661d5 | 1933 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1934 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1935 | return 0; |
91bc4822 | 1936 | |
781c53bc | 1937 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1938 | case 0: |
1939 | if (unlikely(from != 0)) | |
1940 | return -EINVAL; | |
1941 | ||
1942 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1943 | break; | |
91bc4822 AS |
1944 | case 2: |
1945 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1946 | break; | |
1947 | case 4: | |
1948 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1949 | break; | |
1950 | default: | |
1951 | return -EINVAL; | |
1952 | } | |
1953 | ||
2f72959a DB |
1954 | if (is_mmzero && !*ptr) |
1955 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1956 | return 0; |
1957 | } | |
1958 | ||
577c50aa | 1959 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1960 | .func = bpf_l4_csum_replace, |
1961 | .gpl_only = false, | |
1962 | .ret_type = RET_INTEGER, | |
1963 | .arg1_type = ARG_PTR_TO_CTX, | |
1964 | .arg2_type = ARG_ANYTHING, | |
1965 | .arg3_type = ARG_ANYTHING, | |
1966 | .arg4_type = ARG_ANYTHING, | |
1967 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1968 | }; |
1969 | ||
f3694e00 DB |
1970 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1971 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1972 | { |
21cafc1d | 1973 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1974 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1975 | int i, j = 0; |
1976 | ||
1977 | /* This is quite flexible, some examples: | |
1978 | * | |
1979 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1980 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1981 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1982 | * | |
1983 | * Even for diffing, from_size and to_size don't need to be equal. | |
1984 | */ | |
1985 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1986 | diff_size > sizeof(sp->diff))) | |
1987 | return -EINVAL; | |
1988 | ||
1989 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1990 | sp->diff[j] = ~from[i]; | |
1991 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1992 | sp->diff[j] = to[i]; | |
1993 | ||
1994 | return csum_partial(sp->diff, diff_size, seed); | |
1995 | } | |
1996 | ||
577c50aa | 1997 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1998 | .func = bpf_csum_diff, |
1999 | .gpl_only = false, | |
36bbef52 | 2000 | .pkt_access = true, |
7d672345 | 2001 | .ret_type = RET_INTEGER, |
db1ac496 | 2002 | .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 2003 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
db1ac496 | 2004 | .arg3_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 2005 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
7d672345 DB |
2006 | .arg5_type = ARG_ANYTHING, |
2007 | }; | |
2008 | ||
36bbef52 DB |
2009 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
2010 | { | |
2011 | /* The interface is to be used in combination with bpf_csum_diff() | |
2012 | * for direct packet writes. csum rotation for alignment as well | |
2013 | * as emulating csum_sub() can be done from the eBPF program. | |
2014 | */ | |
2015 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
2016 | return (skb->csum = csum_add(skb->csum, csum)); | |
2017 | ||
2018 | return -ENOTSUPP; | |
2019 | } | |
2020 | ||
2021 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
2022 | .func = bpf_csum_update, | |
2023 | .gpl_only = false, | |
2024 | .ret_type = RET_INTEGER, | |
2025 | .arg1_type = ARG_PTR_TO_CTX, | |
2026 | .arg2_type = ARG_ANYTHING, | |
2027 | }; | |
2028 | ||
a70b506e DB |
2029 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
2030 | { | |
a70b506e DB |
2031 | return dev_forward_skb(dev, skb); |
2032 | } | |
2033 | ||
4e3264d2 MKL |
2034 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
2035 | struct sk_buff *skb) | |
2036 | { | |
2037 | int ret = ____dev_forward_skb(dev, skb); | |
2038 | ||
2039 | if (likely(!ret)) { | |
2040 | skb->dev = dev; | |
2041 | ret = netif_rx(skb); | |
2042 | } | |
2043 | ||
2044 | return ret; | |
2045 | } | |
2046 | ||
a70b506e DB |
2047 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
2048 | { | |
2049 | int ret; | |
2050 | ||
97cdcf37 | 2051 | if (dev_xmit_recursion()) { |
a70b506e DB |
2052 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); |
2053 | kfree_skb(skb); | |
2054 | return -ENETDOWN; | |
2055 | } | |
2056 | ||
2057 | skb->dev = dev; | |
5133498f | 2058 | skb->tstamp = 0; |
a70b506e | 2059 | |
97cdcf37 | 2060 | dev_xmit_recursion_inc(); |
a70b506e | 2061 | ret = dev_queue_xmit(skb); |
97cdcf37 | 2062 | dev_xmit_recursion_dec(); |
a70b506e DB |
2063 | |
2064 | return ret; | |
2065 | } | |
2066 | ||
4e3264d2 MKL |
2067 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
2068 | u32 flags) | |
2069 | { | |
e7c87bd6 | 2070 | unsigned int mlen = skb_network_offset(skb); |
4e3264d2 | 2071 | |
e7c87bd6 WB |
2072 | if (mlen) { |
2073 | __skb_pull(skb, mlen); | |
4e3264d2 | 2074 | |
e7c87bd6 WB |
2075 | /* At ingress, the mac header has already been pulled once. |
2076 | * At egress, skb_pospull_rcsum has to be done in case that | |
2077 | * the skb is originated from ingress (i.e. a forwarded skb) | |
2078 | * to ensure that rcsum starts at net header. | |
2079 | */ | |
2080 | if (!skb_at_tc_ingress(skb)) | |
2081 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
2082 | } | |
4e3264d2 MKL |
2083 | skb_pop_mac_header(skb); |
2084 | skb_reset_mac_len(skb); | |
2085 | return flags & BPF_F_INGRESS ? | |
2086 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
2087 | } | |
2088 | ||
2089 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
2090 | u32 flags) | |
2091 | { | |
3a0af8fd TG |
2092 | /* Verify that a link layer header is carried */ |
2093 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
2094 | kfree_skb(skb); | |
2095 | return -ERANGE; | |
2096 | } | |
2097 | ||
4e3264d2 MKL |
2098 | bpf_push_mac_rcsum(skb); |
2099 | return flags & BPF_F_INGRESS ? | |
2100 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
2101 | } | |
2102 | ||
2103 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
2104 | u32 flags) | |
2105 | { | |
c491680f | 2106 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 2107 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
2108 | else |
2109 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
2110 | } |
2111 | ||
f3694e00 | 2112 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 2113 | { |
3896d655 | 2114 | struct net_device *dev; |
36bbef52 DB |
2115 | struct sk_buff *clone; |
2116 | int ret; | |
3896d655 | 2117 | |
781c53bc DB |
2118 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2119 | return -EINVAL; | |
2120 | ||
3896d655 AS |
2121 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
2122 | if (unlikely(!dev)) | |
2123 | return -EINVAL; | |
2124 | ||
36bbef52 DB |
2125 | clone = skb_clone(skb, GFP_ATOMIC); |
2126 | if (unlikely(!clone)) | |
3896d655 AS |
2127 | return -ENOMEM; |
2128 | ||
36bbef52 DB |
2129 | /* For direct write, we need to keep the invariant that the skbs |
2130 | * we're dealing with need to be uncloned. Should uncloning fail | |
2131 | * here, we need to free the just generated clone to unclone once | |
2132 | * again. | |
2133 | */ | |
2134 | ret = bpf_try_make_head_writable(skb); | |
2135 | if (unlikely(ret)) { | |
2136 | kfree_skb(clone); | |
2137 | return -ENOMEM; | |
2138 | } | |
2139 | ||
4e3264d2 | 2140 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
2141 | } |
2142 | ||
577c50aa | 2143 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
2144 | .func = bpf_clone_redirect, |
2145 | .gpl_only = false, | |
2146 | .ret_type = RET_INTEGER, | |
2147 | .arg1_type = ARG_PTR_TO_CTX, | |
2148 | .arg2_type = ARG_ANYTHING, | |
2149 | .arg3_type = ARG_ANYTHING, | |
2150 | }; | |
2151 | ||
0b19cc0a TM |
2152 | DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); |
2153 | EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); | |
781c53bc | 2154 | |
f3694e00 | 2155 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 | 2156 | { |
0b19cc0a | 2157 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 | 2158 | |
781c53bc DB |
2159 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2160 | return TC_ACT_SHOT; | |
2161 | ||
27b29f63 | 2162 | ri->flags = flags; |
4b55cf29 | 2163 | ri->tgt_index = ifindex; |
781c53bc | 2164 | |
27b29f63 AS |
2165 | return TC_ACT_REDIRECT; |
2166 | } | |
2167 | ||
2168 | int skb_do_redirect(struct sk_buff *skb) | |
2169 | { | |
0b19cc0a | 2170 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 AS |
2171 | struct net_device *dev; |
2172 | ||
4b55cf29 THJ |
2173 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index); |
2174 | ri->tgt_index = 0; | |
27b29f63 AS |
2175 | if (unlikely(!dev)) { |
2176 | kfree_skb(skb); | |
2177 | return -EINVAL; | |
2178 | } | |
2179 | ||
4e3264d2 | 2180 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
2181 | } |
2182 | ||
577c50aa | 2183 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
2184 | .func = bpf_redirect, |
2185 | .gpl_only = false, | |
2186 | .ret_type = RET_INTEGER, | |
2187 | .arg1_type = ARG_ANYTHING, | |
2188 | .arg2_type = ARG_ANYTHING, | |
2189 | }; | |
2190 | ||
604326b4 | 2191 | BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) |
2a100317 JF |
2192 | { |
2193 | msg->apply_bytes = bytes; | |
2194 | return 0; | |
2195 | } | |
2196 | ||
2197 | static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { | |
2198 | .func = bpf_msg_apply_bytes, | |
2199 | .gpl_only = false, | |
2200 | .ret_type = RET_INTEGER, | |
2201 | .arg1_type = ARG_PTR_TO_CTX, | |
2202 | .arg2_type = ARG_ANYTHING, | |
2203 | }; | |
2204 | ||
604326b4 | 2205 | BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) |
91843d54 JF |
2206 | { |
2207 | msg->cork_bytes = bytes; | |
2208 | return 0; | |
2209 | } | |
2210 | ||
2211 | static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { | |
2212 | .func = bpf_msg_cork_bytes, | |
2213 | .gpl_only = false, | |
2214 | .ret_type = RET_INTEGER, | |
2215 | .arg1_type = ARG_PTR_TO_CTX, | |
2216 | .arg2_type = ARG_ANYTHING, | |
2217 | }; | |
2218 | ||
604326b4 DB |
2219 | BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, |
2220 | u32, end, u64, flags) | |
015632bb | 2221 | { |
604326b4 DB |
2222 | u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; |
2223 | u32 first_sge, last_sge, i, shift, bytes_sg_total; | |
2224 | struct scatterlist *sge; | |
2225 | u8 *raw, *to, *from; | |
015632bb JF |
2226 | struct page *page; |
2227 | ||
2228 | if (unlikely(flags || end <= start)) | |
2229 | return -EINVAL; | |
2230 | ||
2231 | /* First find the starting scatterlist element */ | |
604326b4 | 2232 | i = msg->sg.start; |
015632bb | 2233 | do { |
6562e29c | 2234 | offset += len; |
604326b4 | 2235 | len = sk_msg_elem(msg, i)->length; |
015632bb JF |
2236 | if (start < offset + len) |
2237 | break; | |
604326b4 DB |
2238 | sk_msg_iter_var_next(i); |
2239 | } while (i != msg->sg.end); | |
015632bb JF |
2240 | |
2241 | if (unlikely(start >= offset + len)) | |
2242 | return -EINVAL; | |
2243 | ||
604326b4 | 2244 | first_sge = i; |
5b24109b DB |
2245 | /* The start may point into the sg element so we need to also |
2246 | * account for the headroom. | |
2247 | */ | |
2248 | bytes_sg_total = start - offset + bytes; | |
163ab96b | 2249 | if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len) |
015632bb | 2250 | goto out; |
015632bb JF |
2251 | |
2252 | /* At this point we need to linearize multiple scatterlist | |
2253 | * elements or a single shared page. Either way we need to | |
2254 | * copy into a linear buffer exclusively owned by BPF. Then | |
2255 | * place the buffer in the scatterlist and fixup the original | |
2256 | * entries by removing the entries now in the linear buffer | |
2257 | * and shifting the remaining entries. For now we do not try | |
2258 | * to copy partial entries to avoid complexity of running out | |
2259 | * of sg_entry slots. The downside is reading a single byte | |
2260 | * will copy the entire sg entry. | |
2261 | */ | |
2262 | do { | |
604326b4 DB |
2263 | copy += sk_msg_elem(msg, i)->length; |
2264 | sk_msg_iter_var_next(i); | |
5b24109b | 2265 | if (bytes_sg_total <= copy) |
015632bb | 2266 | break; |
604326b4 DB |
2267 | } while (i != msg->sg.end); |
2268 | last_sge = i; | |
015632bb | 2269 | |
5b24109b | 2270 | if (unlikely(bytes_sg_total > copy)) |
015632bb JF |
2271 | return -EINVAL; |
2272 | ||
4c3d795c TD |
2273 | page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, |
2274 | get_order(copy)); | |
015632bb JF |
2275 | if (unlikely(!page)) |
2276 | return -ENOMEM; | |
015632bb | 2277 | |
604326b4 DB |
2278 | raw = page_address(page); |
2279 | i = first_sge; | |
015632bb | 2280 | do { |
604326b4 DB |
2281 | sge = sk_msg_elem(msg, i); |
2282 | from = sg_virt(sge); | |
2283 | len = sge->length; | |
2284 | to = raw + poffset; | |
015632bb JF |
2285 | |
2286 | memcpy(to, from, len); | |
9db39f4d | 2287 | poffset += len; |
604326b4 DB |
2288 | sge->length = 0; |
2289 | put_page(sg_page(sge)); | |
015632bb | 2290 | |
604326b4 DB |
2291 | sk_msg_iter_var_next(i); |
2292 | } while (i != last_sge); | |
015632bb | 2293 | |
604326b4 | 2294 | sg_set_page(&msg->sg.data[first_sge], page, copy, 0); |
015632bb JF |
2295 | |
2296 | /* To repair sg ring we need to shift entries. If we only | |
2297 | * had a single entry though we can just replace it and | |
2298 | * be done. Otherwise walk the ring and shift the entries. | |
2299 | */ | |
604326b4 DB |
2300 | WARN_ON_ONCE(last_sge == first_sge); |
2301 | shift = last_sge > first_sge ? | |
2302 | last_sge - first_sge - 1 : | |
031097d9 | 2303 | NR_MSG_FRAG_IDS - first_sge + last_sge - 1; |
015632bb JF |
2304 | if (!shift) |
2305 | goto out; | |
2306 | ||
604326b4 DB |
2307 | i = first_sge; |
2308 | sk_msg_iter_var_next(i); | |
015632bb | 2309 | do { |
604326b4 | 2310 | u32 move_from; |
015632bb | 2311 | |
031097d9 JK |
2312 | if (i + shift >= NR_MSG_FRAG_IDS) |
2313 | move_from = i + shift - NR_MSG_FRAG_IDS; | |
015632bb JF |
2314 | else |
2315 | move_from = i + shift; | |
604326b4 | 2316 | if (move_from == msg->sg.end) |
015632bb JF |
2317 | break; |
2318 | ||
604326b4 DB |
2319 | msg->sg.data[i] = msg->sg.data[move_from]; |
2320 | msg->sg.data[move_from].length = 0; | |
2321 | msg->sg.data[move_from].page_link = 0; | |
2322 | msg->sg.data[move_from].offset = 0; | |
2323 | sk_msg_iter_var_next(i); | |
015632bb | 2324 | } while (1); |
604326b4 DB |
2325 | |
2326 | msg->sg.end = msg->sg.end - shift > msg->sg.end ? | |
031097d9 | 2327 | msg->sg.end - shift + NR_MSG_FRAG_IDS : |
604326b4 | 2328 | msg->sg.end - shift; |
015632bb | 2329 | out: |
604326b4 | 2330 | msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; |
015632bb | 2331 | msg->data_end = msg->data + bytes; |
015632bb JF |
2332 | return 0; |
2333 | } | |
2334 | ||
2335 | static const struct bpf_func_proto bpf_msg_pull_data_proto = { | |
2336 | .func = bpf_msg_pull_data, | |
2337 | .gpl_only = false, | |
2338 | .ret_type = RET_INTEGER, | |
2339 | .arg1_type = ARG_PTR_TO_CTX, | |
2340 | .arg2_type = ARG_ANYTHING, | |
2341 | .arg3_type = ARG_ANYTHING, | |
2342 | .arg4_type = ARG_ANYTHING, | |
2343 | }; | |
2344 | ||
6fff607e JF |
2345 | BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, |
2346 | u32, len, u64, flags) | |
2347 | { | |
2348 | struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; | |
6562e29c | 2349 | u32 new, i = 0, l = 0, space, copy = 0, offset = 0; |
6fff607e JF |
2350 | u8 *raw, *to, *from; |
2351 | struct page *page; | |
2352 | ||
2353 | if (unlikely(flags)) | |
2354 | return -EINVAL; | |
2355 | ||
2356 | /* First find the starting scatterlist element */ | |
2357 | i = msg->sg.start; | |
2358 | do { | |
6562e29c | 2359 | offset += l; |
6fff607e JF |
2360 | l = sk_msg_elem(msg, i)->length; |
2361 | ||
2362 | if (start < offset + l) | |
2363 | break; | |
6fff607e JF |
2364 | sk_msg_iter_var_next(i); |
2365 | } while (i != msg->sg.end); | |
2366 | ||
2367 | if (start >= offset + l) | |
2368 | return -EINVAL; | |
2369 | ||
2370 | space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); | |
2371 | ||
2372 | /* If no space available will fallback to copy, we need at | |
2373 | * least one scatterlist elem available to push data into | |
2374 | * when start aligns to the beginning of an element or two | |
2375 | * when it falls inside an element. We handle the start equals | |
2376 | * offset case because its the common case for inserting a | |
2377 | * header. | |
2378 | */ | |
2379 | if (!space || (space == 1 && start != offset)) | |
2380 | copy = msg->sg.data[i].length; | |
2381 | ||
2382 | page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, | |
2383 | get_order(copy + len)); | |
2384 | if (unlikely(!page)) | |
2385 | return -ENOMEM; | |
2386 | ||
2387 | if (copy) { | |
2388 | int front, back; | |
2389 | ||
2390 | raw = page_address(page); | |
2391 | ||
2392 | psge = sk_msg_elem(msg, i); | |
2393 | front = start - offset; | |
2394 | back = psge->length - front; | |
2395 | from = sg_virt(psge); | |
2396 | ||
2397 | if (front) | |
2398 | memcpy(raw, from, front); | |
2399 | ||
2400 | if (back) { | |
2401 | from += front; | |
2402 | to = raw + front + len; | |
2403 | ||
2404 | memcpy(to, from, back); | |
2405 | } | |
2406 | ||
2407 | put_page(sg_page(psge)); | |
2408 | } else if (start - offset) { | |
2409 | psge = sk_msg_elem(msg, i); | |
2410 | rsge = sk_msg_elem_cpy(msg, i); | |
2411 | ||
2412 | psge->length = start - offset; | |
2413 | rsge.length -= psge->length; | |
2414 | rsge.offset += start; | |
2415 | ||
2416 | sk_msg_iter_var_next(i); | |
2417 | sg_unmark_end(psge); | |
cf21e9ba | 2418 | sg_unmark_end(&rsge); |
6fff607e JF |
2419 | sk_msg_iter_next(msg, end); |
2420 | } | |
2421 | ||
2422 | /* Slot(s) to place newly allocated data */ | |
2423 | new = i; | |
2424 | ||
2425 | /* Shift one or two slots as needed */ | |
2426 | if (!copy) { | |
2427 | sge = sk_msg_elem_cpy(msg, i); | |
2428 | ||
2429 | sk_msg_iter_var_next(i); | |
2430 | sg_unmark_end(&sge); | |
2431 | sk_msg_iter_next(msg, end); | |
2432 | ||
2433 | nsge = sk_msg_elem_cpy(msg, i); | |
2434 | if (rsge.length) { | |
2435 | sk_msg_iter_var_next(i); | |
2436 | nnsge = sk_msg_elem_cpy(msg, i); | |
2437 | } | |
2438 | ||
2439 | while (i != msg->sg.end) { | |
2440 | msg->sg.data[i] = sge; | |
2441 | sge = nsge; | |
2442 | sk_msg_iter_var_next(i); | |
2443 | if (rsge.length) { | |
2444 | nsge = nnsge; | |
2445 | nnsge = sk_msg_elem_cpy(msg, i); | |
2446 | } else { | |
2447 | nsge = sk_msg_elem_cpy(msg, i); | |
2448 | } | |
2449 | } | |
2450 | } | |
2451 | ||
2452 | /* Place newly allocated data buffer */ | |
2453 | sk_mem_charge(msg->sk, len); | |
2454 | msg->sg.size += len; | |
163ab96b | 2455 | __clear_bit(new, &msg->sg.copy); |
6fff607e JF |
2456 | sg_set_page(&msg->sg.data[new], page, len + copy, 0); |
2457 | if (rsge.length) { | |
2458 | get_page(sg_page(&rsge)); | |
2459 | sk_msg_iter_var_next(new); | |
2460 | msg->sg.data[new] = rsge; | |
2461 | } | |
2462 | ||
2463 | sk_msg_compute_data_pointers(msg); | |
2464 | return 0; | |
2465 | } | |
2466 | ||
2467 | static const struct bpf_func_proto bpf_msg_push_data_proto = { | |
2468 | .func = bpf_msg_push_data, | |
2469 | .gpl_only = false, | |
2470 | .ret_type = RET_INTEGER, | |
2471 | .arg1_type = ARG_PTR_TO_CTX, | |
2472 | .arg2_type = ARG_ANYTHING, | |
2473 | .arg3_type = ARG_ANYTHING, | |
2474 | .arg4_type = ARG_ANYTHING, | |
2475 | }; | |
2476 | ||
7246d8ed JF |
2477 | static void sk_msg_shift_left(struct sk_msg *msg, int i) |
2478 | { | |
2479 | int prev; | |
2480 | ||
2481 | do { | |
2482 | prev = i; | |
2483 | sk_msg_iter_var_next(i); | |
2484 | msg->sg.data[prev] = msg->sg.data[i]; | |
2485 | } while (i != msg->sg.end); | |
2486 | ||
2487 | sk_msg_iter_prev(msg, end); | |
2488 | } | |
2489 | ||
2490 | static void sk_msg_shift_right(struct sk_msg *msg, int i) | |
2491 | { | |
2492 | struct scatterlist tmp, sge; | |
2493 | ||
2494 | sk_msg_iter_next(msg, end); | |
2495 | sge = sk_msg_elem_cpy(msg, i); | |
2496 | sk_msg_iter_var_next(i); | |
2497 | tmp = sk_msg_elem_cpy(msg, i); | |
2498 | ||
2499 | while (i != msg->sg.end) { | |
2500 | msg->sg.data[i] = sge; | |
2501 | sk_msg_iter_var_next(i); | |
2502 | sge = tmp; | |
2503 | tmp = sk_msg_elem_cpy(msg, i); | |
2504 | } | |
2505 | } | |
2506 | ||
2507 | BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, | |
2508 | u32, len, u64, flags) | |
2509 | { | |
6562e29c | 2510 | u32 i = 0, l = 0, space, offset = 0; |
7246d8ed JF |
2511 | u64 last = start + len; |
2512 | int pop; | |
2513 | ||
2514 | if (unlikely(flags)) | |
2515 | return -EINVAL; | |
2516 | ||
2517 | /* First find the starting scatterlist element */ | |
2518 | i = msg->sg.start; | |
2519 | do { | |
6562e29c | 2520 | offset += l; |
7246d8ed JF |
2521 | l = sk_msg_elem(msg, i)->length; |
2522 | ||
2523 | if (start < offset + l) | |
2524 | break; | |
7246d8ed JF |
2525 | sk_msg_iter_var_next(i); |
2526 | } while (i != msg->sg.end); | |
2527 | ||
2528 | /* Bounds checks: start and pop must be inside message */ | |
2529 | if (start >= offset + l || last >= msg->sg.size) | |
2530 | return -EINVAL; | |
2531 | ||
2532 | space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); | |
2533 | ||
2534 | pop = len; | |
2535 | /* --------------| offset | |
2536 | * -| start |-------- len -------| | |
2537 | * | |
2538 | * |----- a ----|-------- pop -------|----- b ----| | |
2539 | * |______________________________________________| length | |
2540 | * | |
2541 | * | |
2542 | * a: region at front of scatter element to save | |
2543 | * b: region at back of scatter element to save when length > A + pop | |
2544 | * pop: region to pop from element, same as input 'pop' here will be | |
2545 | * decremented below per iteration. | |
2546 | * | |
2547 | * Two top-level cases to handle when start != offset, first B is non | |
2548 | * zero and second B is zero corresponding to when a pop includes more | |
2549 | * than one element. | |
2550 | * | |
2551 | * Then if B is non-zero AND there is no space allocate space and | |
2552 | * compact A, B regions into page. If there is space shift ring to | |
2553 | * the rigth free'ing the next element in ring to place B, leaving | |
2554 | * A untouched except to reduce length. | |
2555 | */ | |
2556 | if (start != offset) { | |
2557 | struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); | |
2558 | int a = start; | |
2559 | int b = sge->length - pop - a; | |
2560 | ||
2561 | sk_msg_iter_var_next(i); | |
2562 | ||
2563 | if (pop < sge->length - a) { | |
2564 | if (space) { | |
2565 | sge->length = a; | |
2566 | sk_msg_shift_right(msg, i); | |
2567 | nsge = sk_msg_elem(msg, i); | |
2568 | get_page(sg_page(sge)); | |
2569 | sg_set_page(nsge, | |
2570 | sg_page(sge), | |
2571 | b, sge->offset + pop + a); | |
2572 | } else { | |
2573 | struct page *page, *orig; | |
2574 | u8 *to, *from; | |
2575 | ||
2576 | page = alloc_pages(__GFP_NOWARN | | |
2577 | __GFP_COMP | GFP_ATOMIC, | |
2578 | get_order(a + b)); | |
2579 | if (unlikely(!page)) | |
2580 | return -ENOMEM; | |
2581 | ||
2582 | sge->length = a; | |
2583 | orig = sg_page(sge); | |
2584 | from = sg_virt(sge); | |
2585 | to = page_address(page); | |
2586 | memcpy(to, from, a); | |
2587 | memcpy(to + a, from + a + pop, b); | |
2588 | sg_set_page(sge, page, a + b, 0); | |
2589 | put_page(orig); | |
2590 | } | |
2591 | pop = 0; | |
2592 | } else if (pop >= sge->length - a) { | |
2593 | sge->length = a; | |
2594 | pop -= (sge->length - a); | |
2595 | } | |
2596 | } | |
2597 | ||
2598 | /* From above the current layout _must_ be as follows, | |
2599 | * | |
2600 | * -| offset | |
2601 | * -| start | |
2602 | * | |
2603 | * |---- pop ---|---------------- b ------------| | |
2604 | * |____________________________________________| length | |
2605 | * | |
2606 | * Offset and start of the current msg elem are equal because in the | |
2607 | * previous case we handled offset != start and either consumed the | |
2608 | * entire element and advanced to the next element OR pop == 0. | |
2609 | * | |
2610 | * Two cases to handle here are first pop is less than the length | |
2611 | * leaving some remainder b above. Simply adjust the element's layout | |
2612 | * in this case. Or pop >= length of the element so that b = 0. In this | |
2613 | * case advance to next element decrementing pop. | |
2614 | */ | |
2615 | while (pop) { | |
2616 | struct scatterlist *sge = sk_msg_elem(msg, i); | |
2617 | ||
2618 | if (pop < sge->length) { | |
2619 | sge->length -= pop; | |
2620 | sge->offset += pop; | |
2621 | pop = 0; | |
2622 | } else { | |
2623 | pop -= sge->length; | |
2624 | sk_msg_shift_left(msg, i); | |
2625 | } | |
2626 | sk_msg_iter_var_next(i); | |
2627 | } | |
2628 | ||
2629 | sk_mem_uncharge(msg->sk, len - pop); | |
2630 | msg->sg.size -= (len - pop); | |
2631 | sk_msg_compute_data_pointers(msg); | |
2632 | return 0; | |
2633 | } | |
2634 | ||
2635 | static const struct bpf_func_proto bpf_msg_pop_data_proto = { | |
2636 | .func = bpf_msg_pop_data, | |
2637 | .gpl_only = false, | |
2638 | .ret_type = RET_INTEGER, | |
2639 | .arg1_type = ARG_PTR_TO_CTX, | |
2640 | .arg2_type = ARG_ANYTHING, | |
2641 | .arg3_type = ARG_ANYTHING, | |
2642 | .arg4_type = ARG_ANYTHING, | |
2643 | }; | |
2644 | ||
5a52ae4e DB |
2645 | #ifdef CONFIG_CGROUP_NET_CLASSID |
2646 | BPF_CALL_0(bpf_get_cgroup_classid_curr) | |
2647 | { | |
2648 | return __task_get_classid(current); | |
2649 | } | |
2650 | ||
2651 | static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { | |
2652 | .func = bpf_get_cgroup_classid_curr, | |
2653 | .gpl_only = false, | |
2654 | .ret_type = RET_INTEGER, | |
2655 | }; | |
2656 | #endif | |
2657 | ||
f3694e00 | 2658 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 2659 | { |
f3694e00 | 2660 | return task_get_classid(skb); |
8d20aabe DB |
2661 | } |
2662 | ||
2663 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
2664 | .func = bpf_get_cgroup_classid, | |
2665 | .gpl_only = false, | |
2666 | .ret_type = RET_INTEGER, | |
2667 | .arg1_type = ARG_PTR_TO_CTX, | |
2668 | }; | |
2669 | ||
f3694e00 | 2670 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 2671 | { |
f3694e00 | 2672 | return dst_tclassid(skb); |
c46646d0 DB |
2673 | } |
2674 | ||
2675 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
2676 | .func = bpf_get_route_realm, | |
2677 | .gpl_only = false, | |
2678 | .ret_type = RET_INTEGER, | |
2679 | .arg1_type = ARG_PTR_TO_CTX, | |
2680 | }; | |
2681 | ||
f3694e00 | 2682 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
2683 | { |
2684 | /* If skb_clear_hash() was called due to mangling, we can | |
2685 | * trigger SW recalculation here. Later access to hash | |
2686 | * can then use the inline skb->hash via context directly | |
2687 | * instead of calling this helper again. | |
2688 | */ | |
f3694e00 | 2689 | return skb_get_hash(skb); |
13c5c240 DB |
2690 | } |
2691 | ||
2692 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
2693 | .func = bpf_get_hash_recalc, | |
2694 | .gpl_only = false, | |
2695 | .ret_type = RET_INTEGER, | |
2696 | .arg1_type = ARG_PTR_TO_CTX, | |
2697 | }; | |
2698 | ||
7a4b28c6 DB |
2699 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
2700 | { | |
2701 | /* After all direct packet write, this can be used once for | |
2702 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
2703 | */ | |
2704 | skb_clear_hash(skb); | |
2705 | return 0; | |
2706 | } | |
2707 | ||
2708 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
2709 | .func = bpf_set_hash_invalid, | |
2710 | .gpl_only = false, | |
2711 | .ret_type = RET_INTEGER, | |
2712 | .arg1_type = ARG_PTR_TO_CTX, | |
2713 | }; | |
2714 | ||
ded092cd DB |
2715 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
2716 | { | |
2717 | /* Set user specified hash as L4(+), so that it gets returned | |
2718 | * on skb_get_hash() call unless BPF prog later on triggers a | |
2719 | * skb_clear_hash(). | |
2720 | */ | |
2721 | __skb_set_sw_hash(skb, hash, true); | |
2722 | return 0; | |
2723 | } | |
2724 | ||
2725 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
2726 | .func = bpf_set_hash, | |
2727 | .gpl_only = false, | |
2728 | .ret_type = RET_INTEGER, | |
2729 | .arg1_type = ARG_PTR_TO_CTX, | |
2730 | .arg2_type = ARG_ANYTHING, | |
2731 | }; | |
2732 | ||
f3694e00 DB |
2733 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
2734 | u16, vlan_tci) | |
4e10df9a | 2735 | { |
db58ba45 | 2736 | int ret; |
4e10df9a AS |
2737 | |
2738 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
2739 | vlan_proto != htons(ETH_P_8021AD))) | |
2740 | vlan_proto = htons(ETH_P_8021Q); | |
2741 | ||
8065694e | 2742 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2743 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
2744 | bpf_pull_mac_rcsum(skb); |
2745 | ||
6aaae2b6 | 2746 | bpf_compute_data_pointers(skb); |
db58ba45 | 2747 | return ret; |
4e10df9a AS |
2748 | } |
2749 | ||
93731ef0 | 2750 | static const struct bpf_func_proto bpf_skb_vlan_push_proto = { |
4e10df9a AS |
2751 | .func = bpf_skb_vlan_push, |
2752 | .gpl_only = false, | |
2753 | .ret_type = RET_INTEGER, | |
2754 | .arg1_type = ARG_PTR_TO_CTX, | |
2755 | .arg2_type = ARG_ANYTHING, | |
2756 | .arg3_type = ARG_ANYTHING, | |
2757 | }; | |
2758 | ||
f3694e00 | 2759 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 2760 | { |
db58ba45 | 2761 | int ret; |
4e10df9a | 2762 | |
8065694e | 2763 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2764 | ret = skb_vlan_pop(skb); |
8065694e DB |
2765 | bpf_pull_mac_rcsum(skb); |
2766 | ||
6aaae2b6 | 2767 | bpf_compute_data_pointers(skb); |
db58ba45 | 2768 | return ret; |
4e10df9a AS |
2769 | } |
2770 | ||
93731ef0 | 2771 | static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { |
4e10df9a AS |
2772 | .func = bpf_skb_vlan_pop, |
2773 | .gpl_only = false, | |
2774 | .ret_type = RET_INTEGER, | |
2775 | .arg1_type = ARG_PTR_TO_CTX, | |
2776 | }; | |
2777 | ||
6578171a DB |
2778 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
2779 | { | |
2780 | /* Caller already did skb_cow() with len as headroom, | |
2781 | * so no need to do it here. | |
2782 | */ | |
2783 | skb_push(skb, len); | |
2784 | memmove(skb->data, skb->data + len, off); | |
2785 | memset(skb->data + off, 0, len); | |
2786 | ||
2787 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
2788 | * needed here as it does not change the skb->csum | |
2789 | * result for checksum complete when summing over | |
2790 | * zeroed blocks. | |
2791 | */ | |
2792 | return 0; | |
2793 | } | |
2794 | ||
2795 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
2796 | { | |
2797 | /* skb_ensure_writable() is not needed here, as we're | |
2798 | * already working on an uncloned skb. | |
2799 | */ | |
2800 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
2801 | return -ENOMEM; | |
2802 | ||
2803 | skb_postpull_rcsum(skb, skb->data + off, len); | |
2804 | memmove(skb->data + len, skb->data, off); | |
2805 | __skb_pull(skb, len); | |
2806 | ||
2807 | return 0; | |
2808 | } | |
2809 | ||
2810 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
2811 | { | |
2812 | bool trans_same = skb->transport_header == skb->network_header; | |
2813 | int ret; | |
2814 | ||
2815 | /* There's no need for __skb_push()/__skb_pull() pair to | |
2816 | * get to the start of the mac header as we're guaranteed | |
2817 | * to always start from here under eBPF. | |
2818 | */ | |
2819 | ret = bpf_skb_generic_push(skb, off, len); | |
2820 | if (likely(!ret)) { | |
2821 | skb->mac_header -= len; | |
2822 | skb->network_header -= len; | |
2823 | if (trans_same) | |
2824 | skb->transport_header = skb->network_header; | |
2825 | } | |
2826 | ||
2827 | return ret; | |
2828 | } | |
2829 | ||
2830 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
2831 | { | |
2832 | bool trans_same = skb->transport_header == skb->network_header; | |
2833 | int ret; | |
2834 | ||
2835 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2836 | ret = bpf_skb_generic_pop(skb, off, len); | |
2837 | if (likely(!ret)) { | |
2838 | skb->mac_header += len; | |
2839 | skb->network_header += len; | |
2840 | if (trans_same) | |
2841 | skb->transport_header = skb->network_header; | |
2842 | } | |
2843 | ||
2844 | return ret; | |
2845 | } | |
2846 | ||
2847 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2848 | { | |
2849 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2850 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2851 | int ret; |
2852 | ||
4c3024de | 2853 | if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) |
d02f51cb DA |
2854 | return -ENOTSUPP; |
2855 | ||
6578171a DB |
2856 | ret = skb_cow(skb, len_diff); |
2857 | if (unlikely(ret < 0)) | |
2858 | return ret; | |
2859 | ||
2860 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2861 | if (unlikely(ret < 0)) | |
2862 | return ret; | |
2863 | ||
2864 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2865 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2866 | ||
880388aa DM |
2867 | /* SKB_GSO_TCPV4 needs to be changed into |
2868 | * SKB_GSO_TCPV6. | |
6578171a | 2869 | */ |
d02f51cb DA |
2870 | if (shinfo->gso_type & SKB_GSO_TCPV4) { |
2871 | shinfo->gso_type &= ~SKB_GSO_TCPV4; | |
2872 | shinfo->gso_type |= SKB_GSO_TCPV6; | |
6578171a DB |
2873 | } |
2874 | ||
2875 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
d02f51cb | 2876 | skb_decrease_gso_size(shinfo, len_diff); |
6578171a | 2877 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2878 | shinfo->gso_type |= SKB_GSO_DODGY; |
2879 | shinfo->gso_segs = 0; | |
6578171a DB |
2880 | } |
2881 | ||
2882 | skb->protocol = htons(ETH_P_IPV6); | |
2883 | skb_clear_hash(skb); | |
2884 | ||
2885 | return 0; | |
2886 | } | |
2887 | ||
2888 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2889 | { | |
2890 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2891 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2892 | int ret; |
2893 | ||
4c3024de | 2894 | if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) |
d02f51cb DA |
2895 | return -ENOTSUPP; |
2896 | ||
6578171a DB |
2897 | ret = skb_unclone(skb, GFP_ATOMIC); |
2898 | if (unlikely(ret < 0)) | |
2899 | return ret; | |
2900 | ||
2901 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2902 | if (unlikely(ret < 0)) | |
2903 | return ret; | |
2904 | ||
2905 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2906 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2907 | ||
880388aa DM |
2908 | /* SKB_GSO_TCPV6 needs to be changed into |
2909 | * SKB_GSO_TCPV4. | |
6578171a | 2910 | */ |
d02f51cb DA |
2911 | if (shinfo->gso_type & SKB_GSO_TCPV6) { |
2912 | shinfo->gso_type &= ~SKB_GSO_TCPV6; | |
2913 | shinfo->gso_type |= SKB_GSO_TCPV4; | |
6578171a DB |
2914 | } |
2915 | ||
2916 | /* Due to IPv4 header, MSS can be upgraded. */ | |
d02f51cb | 2917 | skb_increase_gso_size(shinfo, len_diff); |
6578171a | 2918 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2919 | shinfo->gso_type |= SKB_GSO_DODGY; |
2920 | shinfo->gso_segs = 0; | |
6578171a DB |
2921 | } |
2922 | ||
2923 | skb->protocol = htons(ETH_P_IP); | |
2924 | skb_clear_hash(skb); | |
2925 | ||
2926 | return 0; | |
2927 | } | |
2928 | ||
2929 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2930 | { | |
2931 | __be16 from_proto = skb->protocol; | |
2932 | ||
2933 | if (from_proto == htons(ETH_P_IP) && | |
2934 | to_proto == htons(ETH_P_IPV6)) | |
2935 | return bpf_skb_proto_4_to_6(skb); | |
2936 | ||
2937 | if (from_proto == htons(ETH_P_IPV6) && | |
2938 | to_proto == htons(ETH_P_IP)) | |
2939 | return bpf_skb_proto_6_to_4(skb); | |
2940 | ||
2941 | return -ENOTSUPP; | |
2942 | } | |
2943 | ||
f3694e00 DB |
2944 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2945 | u64, flags) | |
6578171a | 2946 | { |
6578171a DB |
2947 | int ret; |
2948 | ||
2949 | if (unlikely(flags)) | |
2950 | return -EINVAL; | |
2951 | ||
2952 | /* General idea is that this helper does the basic groundwork | |
2953 | * needed for changing the protocol, and eBPF program fills the | |
2954 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2955 | * and other helpers, rather than passing a raw buffer here. | |
2956 | * | |
2957 | * The rationale is to keep this minimal and without a need to | |
2958 | * deal with raw packet data. F.e. even if we would pass buffers | |
2959 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2960 | * helpers anyway. Plus, this way we keep also separation of | |
2961 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2962 | * care of stores. | |
2963 | * | |
2964 | * Currently, additional options and extension header space are | |
2965 | * not supported, but flags register is reserved so we can adapt | |
2966 | * that. For offloads, we mark packet as dodgy, so that headers | |
2967 | * need to be verified first. | |
2968 | */ | |
2969 | ret = bpf_skb_proto_xlat(skb, proto); | |
6aaae2b6 | 2970 | bpf_compute_data_pointers(skb); |
6578171a DB |
2971 | return ret; |
2972 | } | |
2973 | ||
2974 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2975 | .func = bpf_skb_change_proto, | |
2976 | .gpl_only = false, | |
2977 | .ret_type = RET_INTEGER, | |
2978 | .arg1_type = ARG_PTR_TO_CTX, | |
2979 | .arg2_type = ARG_ANYTHING, | |
2980 | .arg3_type = ARG_ANYTHING, | |
2981 | }; | |
2982 | ||
f3694e00 | 2983 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2984 | { |
d2485c42 | 2985 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2986 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2987 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2988 | return -EINVAL; |
2989 | ||
2990 | skb->pkt_type = pkt_type; | |
2991 | return 0; | |
2992 | } | |
2993 | ||
2994 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2995 | .func = bpf_skb_change_type, | |
2996 | .gpl_only = false, | |
2997 | .ret_type = RET_INTEGER, | |
2998 | .arg1_type = ARG_PTR_TO_CTX, | |
2999 | .arg2_type = ARG_ANYTHING, | |
3000 | }; | |
3001 | ||
2be7e212 DB |
3002 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
3003 | { | |
3004 | switch (skb->protocol) { | |
3005 | case htons(ETH_P_IP): | |
3006 | return sizeof(struct iphdr); | |
3007 | case htons(ETH_P_IPV6): | |
3008 | return sizeof(struct ipv6hdr); | |
3009 | default: | |
3010 | return ~0U; | |
3011 | } | |
3012 | } | |
3013 | ||
868d5235 WB |
3014 | #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ |
3015 | BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) | |
3016 | ||
3017 | #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ | |
3018 | BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ | |
3019 | BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ | |
58dfc900 AM |
3020 | BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ |
3021 | BPF_F_ADJ_ROOM_ENCAP_L2( \ | |
3022 | BPF_ADJ_ROOM_ENCAP_L2_MASK)) | |
2278f6cc WB |
3023 | |
3024 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, | |
3025 | u64 flags) | |
2be7e212 | 3026 | { |
58dfc900 | 3027 | u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; |
868d5235 | 3028 | bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; |
62b31b42 | 3029 | u16 mac_len = 0, inner_net = 0, inner_trans = 0; |
868d5235 | 3030 | unsigned int gso_type = SKB_GSO_DODGY; |
2be7e212 DB |
3031 | int ret; |
3032 | ||
2278f6cc WB |
3033 | if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { |
3034 | /* udp gso_size delineates datagrams, only allow if fixed */ | |
3035 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || | |
3036 | !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) | |
3037 | return -ENOTSUPP; | |
3038 | } | |
d02f51cb | 3039 | |
908adce6 | 3040 | ret = skb_cow_head(skb, len_diff); |
2be7e212 DB |
3041 | if (unlikely(ret < 0)) |
3042 | return ret; | |
3043 | ||
868d5235 WB |
3044 | if (encap) { |
3045 | if (skb->protocol != htons(ETH_P_IP) && | |
3046 | skb->protocol != htons(ETH_P_IPV6)) | |
3047 | return -ENOTSUPP; | |
3048 | ||
3049 | if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && | |
3050 | flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) | |
3051 | return -EINVAL; | |
3052 | ||
3053 | if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && | |
3054 | flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) | |
3055 | return -EINVAL; | |
3056 | ||
3057 | if (skb->encapsulation) | |
3058 | return -EALREADY; | |
3059 | ||
3060 | mac_len = skb->network_header - skb->mac_header; | |
3061 | inner_net = skb->network_header; | |
58dfc900 AM |
3062 | if (inner_mac_len > len_diff) |
3063 | return -EINVAL; | |
868d5235 WB |
3064 | inner_trans = skb->transport_header; |
3065 | } | |
3066 | ||
2be7e212 DB |
3067 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); |
3068 | if (unlikely(ret < 0)) | |
3069 | return ret; | |
3070 | ||
868d5235 | 3071 | if (encap) { |
58dfc900 | 3072 | skb->inner_mac_header = inner_net - inner_mac_len; |
868d5235 WB |
3073 | skb->inner_network_header = inner_net; |
3074 | skb->inner_transport_header = inner_trans; | |
3075 | skb_set_inner_protocol(skb, skb->protocol); | |
3076 | ||
3077 | skb->encapsulation = 1; | |
3078 | skb_set_network_header(skb, mac_len); | |
3079 | ||
3080 | if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) | |
3081 | gso_type |= SKB_GSO_UDP_TUNNEL; | |
3082 | else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) | |
3083 | gso_type |= SKB_GSO_GRE; | |
3084 | else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) | |
3085 | gso_type |= SKB_GSO_IPXIP6; | |
58dfc900 | 3086 | else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) |
868d5235 WB |
3087 | gso_type |= SKB_GSO_IPXIP4; |
3088 | ||
3089 | if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || | |
3090 | flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { | |
3091 | int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? | |
3092 | sizeof(struct ipv6hdr) : | |
3093 | sizeof(struct iphdr); | |
3094 | ||
3095 | skb_set_transport_header(skb, mac_len + nh_len); | |
3096 | } | |
1b00e0df WB |
3097 | |
3098 | /* Match skb->protocol to new outer l3 protocol */ | |
3099 | if (skb->protocol == htons(ETH_P_IP) && | |
3100 | flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) | |
3101 | skb->protocol = htons(ETH_P_IPV6); | |
3102 | else if (skb->protocol == htons(ETH_P_IPV6) && | |
3103 | flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) | |
3104 | skb->protocol = htons(ETH_P_IP); | |
868d5235 WB |
3105 | } |
3106 | ||
2be7e212 | 3107 | if (skb_is_gso(skb)) { |
d02f51cb DA |
3108 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
3109 | ||
2be7e212 | 3110 | /* Due to header grow, MSS needs to be downgraded. */ |
2278f6cc WB |
3111 | if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
3112 | skb_decrease_gso_size(shinfo, len_diff); | |
3113 | ||
2be7e212 | 3114 | /* Header must be checked, and gso_segs recomputed. */ |
868d5235 | 3115 | shinfo->gso_type |= gso_type; |
d02f51cb | 3116 | shinfo->gso_segs = 0; |
2be7e212 DB |
3117 | } |
3118 | ||
3119 | return 0; | |
3120 | } | |
3121 | ||
2278f6cc WB |
3122 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, |
3123 | u64 flags) | |
2be7e212 | 3124 | { |
2be7e212 DB |
3125 | int ret; |
3126 | ||
43537b8e WB |
3127 | if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO) |
3128 | return -EINVAL; | |
3129 | ||
2278f6cc WB |
3130 | if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { |
3131 | /* udp gso_size delineates datagrams, only allow if fixed */ | |
3132 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || | |
3133 | !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) | |
3134 | return -ENOTSUPP; | |
3135 | } | |
d02f51cb | 3136 | |
2be7e212 DB |
3137 | ret = skb_unclone(skb, GFP_ATOMIC); |
3138 | if (unlikely(ret < 0)) | |
3139 | return ret; | |
3140 | ||
3141 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
3142 | if (unlikely(ret < 0)) | |
3143 | return ret; | |
3144 | ||
3145 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
3146 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
3147 | ||
2be7e212 | 3148 | /* Due to header shrink, MSS can be upgraded. */ |
2278f6cc WB |
3149 | if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
3150 | skb_increase_gso_size(shinfo, len_diff); | |
3151 | ||
2be7e212 | 3152 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
3153 | shinfo->gso_type |= SKB_GSO_DODGY; |
3154 | shinfo->gso_segs = 0; | |
2be7e212 DB |
3155 | } |
3156 | ||
3157 | return 0; | |
3158 | } | |
3159 | ||
3160 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
3161 | { | |
0c6bc6e5 JF |
3162 | return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : |
3163 | SKB_MAX_ALLOC; | |
2be7e212 DB |
3164 | } |
3165 | ||
14aa3192 WB |
3166 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, |
3167 | u32, mode, u64, flags) | |
2be7e212 | 3168 | { |
2be7e212 DB |
3169 | u32 len_cur, len_diff_abs = abs(len_diff); |
3170 | u32 len_min = bpf_skb_net_base_len(skb); | |
3171 | u32 len_max = __bpf_skb_max_len(skb); | |
3172 | __be16 proto = skb->protocol; | |
3173 | bool shrink = len_diff < 0; | |
14aa3192 | 3174 | u32 off; |
2be7e212 DB |
3175 | int ret; |
3176 | ||
2278f6cc | 3177 | if (unlikely(flags & ~BPF_F_ADJ_ROOM_MASK)) |
14aa3192 | 3178 | return -EINVAL; |
2be7e212 DB |
3179 | if (unlikely(len_diff_abs > 0xfffU)) |
3180 | return -EFAULT; | |
3181 | if (unlikely(proto != htons(ETH_P_IP) && | |
3182 | proto != htons(ETH_P_IPV6))) | |
3183 | return -ENOTSUPP; | |
3184 | ||
14aa3192 WB |
3185 | off = skb_mac_header_len(skb); |
3186 | switch (mode) { | |
3187 | case BPF_ADJ_ROOM_NET: | |
3188 | off += bpf_skb_net_base_len(skb); | |
3189 | break; | |
3190 | case BPF_ADJ_ROOM_MAC: | |
3191 | break; | |
3192 | default: | |
3193 | return -ENOTSUPP; | |
3194 | } | |
3195 | ||
2be7e212 | 3196 | len_cur = skb->len - skb_network_offset(skb); |
2be7e212 DB |
3197 | if ((shrink && (len_diff_abs >= len_cur || |
3198 | len_cur - len_diff_abs < len_min)) || | |
3199 | (!shrink && (skb->len + len_diff_abs > len_max && | |
3200 | !skb_is_gso(skb)))) | |
3201 | return -ENOTSUPP; | |
3202 | ||
2278f6cc WB |
3203 | ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : |
3204 | bpf_skb_net_grow(skb, off, len_diff_abs, flags); | |
2be7e212 | 3205 | |
6aaae2b6 | 3206 | bpf_compute_data_pointers(skb); |
e4a6a342 | 3207 | return ret; |
2be7e212 DB |
3208 | } |
3209 | ||
2be7e212 DB |
3210 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { |
3211 | .func = bpf_skb_adjust_room, | |
3212 | .gpl_only = false, | |
3213 | .ret_type = RET_INTEGER, | |
3214 | .arg1_type = ARG_PTR_TO_CTX, | |
3215 | .arg2_type = ARG_ANYTHING, | |
3216 | .arg3_type = ARG_ANYTHING, | |
3217 | .arg4_type = ARG_ANYTHING, | |
3218 | }; | |
3219 | ||
5293efe6 DB |
3220 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
3221 | { | |
3222 | u32 min_len = skb_network_offset(skb); | |
3223 | ||
3224 | if (skb_transport_header_was_set(skb)) | |
3225 | min_len = skb_transport_offset(skb); | |
3226 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
3227 | min_len = skb_checksum_start_offset(skb) + | |
3228 | skb->csum_offset + sizeof(__sum16); | |
3229 | return min_len; | |
3230 | } | |
3231 | ||
5293efe6 DB |
3232 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
3233 | { | |
3234 | unsigned int old_len = skb->len; | |
3235 | int ret; | |
3236 | ||
3237 | ret = __skb_grow_rcsum(skb, new_len); | |
3238 | if (!ret) | |
3239 | memset(skb->data + old_len, 0, new_len - old_len); | |
3240 | return ret; | |
3241 | } | |
3242 | ||
3243 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
3244 | { | |
3245 | return __skb_trim_rcsum(skb, new_len); | |
3246 | } | |
3247 | ||
0ea488ff JF |
3248 | static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, |
3249 | u64 flags) | |
5293efe6 | 3250 | { |
5293efe6 DB |
3251 | u32 max_len = __bpf_skb_max_len(skb); |
3252 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
3253 | int ret; |
3254 | ||
3255 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
3256 | return -EINVAL; | |
3257 | if (skb->encapsulation) | |
3258 | return -ENOTSUPP; | |
3259 | ||
3260 | /* The basic idea of this helper is that it's performing the | |
3261 | * needed work to either grow or trim an skb, and eBPF program | |
3262 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
3263 | * bpf_lX_csum_replace() and others rather than passing a raw | |
3264 | * buffer here. This one is a slow path helper and intended | |
3265 | * for replies with control messages. | |
3266 | * | |
3267 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
3268 | * minimal and without protocol specifics so that we are able | |
3269 | * to separate concerns as in bpf_skb_store_bytes() should only | |
3270 | * be the one responsible for writing buffers. | |
3271 | * | |
3272 | * It's really expected to be a slow path operation here for | |
3273 | * control message replies, so we're implicitly linearizing, | |
3274 | * uncloning and drop offloads from the skb by this. | |
3275 | */ | |
3276 | ret = __bpf_try_make_writable(skb, skb->len); | |
3277 | if (!ret) { | |
3278 | if (new_len > skb->len) | |
3279 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
3280 | else if (new_len < skb->len) | |
3281 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
3282 | if (!ret && skb_is_gso(skb)) | |
3283 | skb_gso_reset(skb); | |
3284 | } | |
0ea488ff JF |
3285 | return ret; |
3286 | } | |
3287 | ||
3288 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, | |
3289 | u64, flags) | |
3290 | { | |
3291 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
5293efe6 | 3292 | |
6aaae2b6 | 3293 | bpf_compute_data_pointers(skb); |
5293efe6 DB |
3294 | return ret; |
3295 | } | |
3296 | ||
3297 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
3298 | .func = bpf_skb_change_tail, | |
3299 | .gpl_only = false, | |
3300 | .ret_type = RET_INTEGER, | |
3301 | .arg1_type = ARG_PTR_TO_CTX, | |
3302 | .arg2_type = ARG_ANYTHING, | |
3303 | .arg3_type = ARG_ANYTHING, | |
3304 | }; | |
3305 | ||
0ea488ff | 3306 | BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
3a0af8fd | 3307 | u64, flags) |
0ea488ff JF |
3308 | { |
3309 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
3310 | ||
3311 | bpf_compute_data_end_sk_skb(skb); | |
3312 | return ret; | |
3313 | } | |
3314 | ||
3315 | static const struct bpf_func_proto sk_skb_change_tail_proto = { | |
3316 | .func = sk_skb_change_tail, | |
3317 | .gpl_only = false, | |
3318 | .ret_type = RET_INTEGER, | |
3319 | .arg1_type = ARG_PTR_TO_CTX, | |
3320 | .arg2_type = ARG_ANYTHING, | |
3321 | .arg3_type = ARG_ANYTHING, | |
3322 | }; | |
3323 | ||
3324 | static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, | |
3325 | u64 flags) | |
3a0af8fd TG |
3326 | { |
3327 | u32 max_len = __bpf_skb_max_len(skb); | |
3328 | u32 new_len = skb->len + head_room; | |
3329 | int ret; | |
3330 | ||
3331 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
3332 | new_len < skb->len)) | |
3333 | return -EINVAL; | |
3334 | ||
3335 | ret = skb_cow(skb, head_room); | |
3336 | if (likely(!ret)) { | |
3337 | /* Idea for this helper is that we currently only | |
3338 | * allow to expand on mac header. This means that | |
3339 | * skb->protocol network header, etc, stay as is. | |
3340 | * Compared to bpf_skb_change_tail(), we're more | |
3341 | * flexible due to not needing to linearize or | |
3342 | * reset GSO. Intention for this helper is to be | |
3343 | * used by an L3 skb that needs to push mac header | |
3344 | * for redirection into L2 device. | |
3345 | */ | |
3346 | __skb_push(skb, head_room); | |
3347 | memset(skb->data, 0, head_room); | |
3348 | skb_reset_mac_header(skb); | |
3349 | } | |
3350 | ||
0ea488ff JF |
3351 | return ret; |
3352 | } | |
3353 | ||
3354 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, | |
3355 | u64, flags) | |
3356 | { | |
3357 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3358 | ||
6aaae2b6 | 3359 | bpf_compute_data_pointers(skb); |
0ea488ff | 3360 | return ret; |
3a0af8fd TG |
3361 | } |
3362 | ||
3363 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
3364 | .func = bpf_skb_change_head, | |
3365 | .gpl_only = false, | |
3366 | .ret_type = RET_INTEGER, | |
3367 | .arg1_type = ARG_PTR_TO_CTX, | |
3368 | .arg2_type = ARG_ANYTHING, | |
3369 | .arg3_type = ARG_ANYTHING, | |
3370 | }; | |
3371 | ||
0ea488ff JF |
3372 | BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, |
3373 | u64, flags) | |
3374 | { | |
3375 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3376 | ||
3377 | bpf_compute_data_end_sk_skb(skb); | |
3378 | return ret; | |
3379 | } | |
3380 | ||
3381 | static const struct bpf_func_proto sk_skb_change_head_proto = { | |
3382 | .func = sk_skb_change_head, | |
3383 | .gpl_only = false, | |
3384 | .ret_type = RET_INTEGER, | |
3385 | .arg1_type = ARG_PTR_TO_CTX, | |
3386 | .arg2_type = ARG_ANYTHING, | |
3387 | .arg3_type = ARG_ANYTHING, | |
3388 | }; | |
de8f3a83 DB |
3389 | static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) |
3390 | { | |
3391 | return xdp_data_meta_unsupported(xdp) ? 0 : | |
3392 | xdp->data - xdp->data_meta; | |
3393 | } | |
3394 | ||
17bedab2 MKL |
3395 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
3396 | { | |
6dfb970d | 3397 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 | 3398 | unsigned long metalen = xdp_get_metalen(xdp); |
97e19cce | 3399 | void *data_start = xdp_frame_end + metalen; |
17bedab2 MKL |
3400 | void *data = xdp->data + offset; |
3401 | ||
de8f3a83 | 3402 | if (unlikely(data < data_start || |
17bedab2 MKL |
3403 | data > xdp->data_end - ETH_HLEN)) |
3404 | return -EINVAL; | |
3405 | ||
de8f3a83 DB |
3406 | if (metalen) |
3407 | memmove(xdp->data_meta + offset, | |
3408 | xdp->data_meta, metalen); | |
3409 | xdp->data_meta += offset; | |
17bedab2 MKL |
3410 | xdp->data = data; |
3411 | ||
3412 | return 0; | |
3413 | } | |
3414 | ||
3415 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
3416 | .func = bpf_xdp_adjust_head, | |
3417 | .gpl_only = false, | |
3418 | .ret_type = RET_INTEGER, | |
3419 | .arg1_type = ARG_PTR_TO_CTX, | |
3420 | .arg2_type = ARG_ANYTHING, | |
3421 | }; | |
3422 | ||
b32cc5b9 NS |
3423 | BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) |
3424 | { | |
3425 | void *data_end = xdp->data_end + offset; | |
3426 | ||
3427 | /* only shrinking is allowed for now. */ | |
3428 | if (unlikely(offset >= 0)) | |
3429 | return -EINVAL; | |
3430 | ||
3431 | if (unlikely(data_end < xdp->data + ETH_HLEN)) | |
3432 | return -EINVAL; | |
3433 | ||
3434 | xdp->data_end = data_end; | |
3435 | ||
3436 | return 0; | |
3437 | } | |
3438 | ||
3439 | static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { | |
3440 | .func = bpf_xdp_adjust_tail, | |
3441 | .gpl_only = false, | |
3442 | .ret_type = RET_INTEGER, | |
3443 | .arg1_type = ARG_PTR_TO_CTX, | |
3444 | .arg2_type = ARG_ANYTHING, | |
3445 | }; | |
3446 | ||
de8f3a83 DB |
3447 | BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) |
3448 | { | |
97e19cce | 3449 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 DB |
3450 | void *meta = xdp->data_meta + offset; |
3451 | unsigned long metalen = xdp->data - meta; | |
3452 | ||
3453 | if (xdp_data_meta_unsupported(xdp)) | |
3454 | return -ENOTSUPP; | |
97e19cce | 3455 | if (unlikely(meta < xdp_frame_end || |
de8f3a83 DB |
3456 | meta > xdp->data)) |
3457 | return -EINVAL; | |
3458 | if (unlikely((metalen & (sizeof(__u32) - 1)) || | |
3459 | (metalen > 32))) | |
3460 | return -EACCES; | |
3461 | ||
3462 | xdp->data_meta = meta; | |
3463 | ||
3464 | return 0; | |
3465 | } | |
3466 | ||
3467 | static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { | |
3468 | .func = bpf_xdp_adjust_meta, | |
3469 | .gpl_only = false, | |
3470 | .ret_type = RET_INTEGER, | |
3471 | .arg1_type = ARG_PTR_TO_CTX, | |
3472 | .arg2_type = ARG_ANYTHING, | |
3473 | }; | |
3474 | ||
9c270af3 | 3475 | static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, |
1170beaa | 3476 | struct bpf_map *map, struct xdp_buff *xdp) |
9c270af3 | 3477 | { |
1b1a251c | 3478 | switch (map->map_type) { |
6f9d451a | 3479 | case BPF_MAP_TYPE_DEVMAP: |
1170beaa BT |
3480 | case BPF_MAP_TYPE_DEVMAP_HASH: |
3481 | return dev_map_enqueue(fwd, xdp, dev_rx); | |
3482 | case BPF_MAP_TYPE_CPUMAP: | |
3483 | return cpu_map_enqueue(fwd, xdp, dev_rx); | |
3484 | case BPF_MAP_TYPE_XSKMAP: | |
3485 | return __xsk_map_redirect(fwd, xdp); | |
1b1a251c | 3486 | default: |
0a29275b | 3487 | return -EBADRQC; |
9c270af3 | 3488 | } |
e4a8e817 | 3489 | return 0; |
814abfab JF |
3490 | } |
3491 | ||
1d233886 | 3492 | void xdp_do_flush(void) |
11393cc9 | 3493 | { |
1d233886 | 3494 | __dev_flush(); |
332f22a6 BT |
3495 | __cpu_map_flush(); |
3496 | __xsk_map_flush(); | |
11393cc9 | 3497 | } |
1d233886 | 3498 | EXPORT_SYMBOL_GPL(xdp_do_flush); |
11393cc9 | 3499 | |
2a68d85f | 3500 | static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) |
9c270af3 JDB |
3501 | { |
3502 | switch (map->map_type) { | |
3503 | case BPF_MAP_TYPE_DEVMAP: | |
3504 | return __dev_map_lookup_elem(map, index); | |
6f9d451a THJ |
3505 | case BPF_MAP_TYPE_DEVMAP_HASH: |
3506 | return __dev_map_hash_lookup_elem(map, index); | |
9c270af3 JDB |
3507 | case BPF_MAP_TYPE_CPUMAP: |
3508 | return __cpu_map_lookup_elem(map, index); | |
1b1a251c BT |
3509 | case BPF_MAP_TYPE_XSKMAP: |
3510 | return __xsk_map_lookup_elem(map, index); | |
9c270af3 JDB |
3511 | default: |
3512 | return NULL; | |
3513 | } | |
3514 | } | |
3515 | ||
f6069b9a | 3516 | void bpf_clear_redirect_map(struct bpf_map *map) |
7c300131 | 3517 | { |
f6069b9a DB |
3518 | struct bpf_redirect_info *ri; |
3519 | int cpu; | |
3520 | ||
3521 | for_each_possible_cpu(cpu) { | |
3522 | ri = per_cpu_ptr(&bpf_redirect_info, cpu); | |
3523 | /* Avoid polluting remote cacheline due to writes if | |
3524 | * not needed. Once we pass this test, we need the | |
3525 | * cmpxchg() to make sure it hasn't been changed in | |
3526 | * the meantime by remote CPU. | |
3527 | */ | |
3528 | if (unlikely(READ_ONCE(ri->map) == map)) | |
3529 | cmpxchg(&ri->map, map, NULL); | |
3530 | } | |
7c300131 DB |
3531 | } |
3532 | ||
1d233886 THJ |
3533 | int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
3534 | struct bpf_prog *xdp_prog) | |
97f91a7c | 3535 | { |
1d233886 THJ |
3536 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
3537 | struct bpf_map *map = READ_ONCE(ri->map); | |
4b55cf29 | 3538 | u32 index = ri->tgt_index; |
43e74c02 | 3539 | void *fwd = ri->tgt_value; |
4c03bdd7 | 3540 | int err; |
97f91a7c | 3541 | |
4b55cf29 | 3542 | ri->tgt_index = 0; |
43e74c02 | 3543 | ri->tgt_value = NULL; |
f6069b9a | 3544 | WRITE_ONCE(ri->map, NULL); |
97f91a7c | 3545 | |
1d233886 THJ |
3546 | if (unlikely(!map)) { |
3547 | fwd = dev_get_by_index_rcu(dev_net(dev), index); | |
3548 | if (unlikely(!fwd)) { | |
3549 | err = -EINVAL; | |
3550 | goto err; | |
3551 | } | |
3552 | ||
3553 | err = dev_xdp_enqueue(fwd, xdp, dev); | |
3554 | } else { | |
3555 | err = __bpf_tx_xdp_map(dev, fwd, map, xdp); | |
3556 | } | |
3557 | ||
f5836ca5 JDB |
3558 | if (unlikely(err)) |
3559 | goto err; | |
3560 | ||
59a30896 | 3561 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
f5836ca5 JDB |
3562 | return 0; |
3563 | err: | |
59a30896 | 3564 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
97f91a7c JF |
3565 | return err; |
3566 | } | |
814abfab JF |
3567 | EXPORT_SYMBOL_GPL(xdp_do_redirect); |
3568 | ||
c060bc61 XS |
3569 | static int xdp_do_generic_redirect_map(struct net_device *dev, |
3570 | struct sk_buff *skb, | |
02671e23 | 3571 | struct xdp_buff *xdp, |
f6069b9a DB |
3572 | struct bpf_prog *xdp_prog, |
3573 | struct bpf_map *map) | |
6103aa96 | 3574 | { |
0b19cc0a | 3575 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
4b55cf29 | 3576 | u32 index = ri->tgt_index; |
43e74c02 | 3577 | void *fwd = ri->tgt_value; |
2facaad6 | 3578 | int err = 0; |
6103aa96 | 3579 | |
4b55cf29 | 3580 | ri->tgt_index = 0; |
43e74c02 | 3581 | ri->tgt_value = NULL; |
f6069b9a | 3582 | WRITE_ONCE(ri->map, NULL); |
96c5508e | 3583 | |
6f9d451a THJ |
3584 | if (map->map_type == BPF_MAP_TYPE_DEVMAP || |
3585 | map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) { | |
6d5fc195 TM |
3586 | struct bpf_dtab_netdev *dst = fwd; |
3587 | ||
3588 | err = dev_map_generic_redirect(dst, skb, xdp_prog); | |
3589 | if (unlikely(err)) | |
9c270af3 | 3590 | goto err; |
02671e23 BT |
3591 | } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { |
3592 | struct xdp_sock *xs = fwd; | |
3593 | ||
3594 | err = xsk_generic_rcv(xs, xdp); | |
3595 | if (err) | |
3596 | goto err; | |
3597 | consume_skb(skb); | |
9c270af3 JDB |
3598 | } else { |
3599 | /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ | |
3600 | err = -EBADRQC; | |
f5836ca5 | 3601 | goto err; |
2facaad6 | 3602 | } |
6103aa96 | 3603 | |
9c270af3 JDB |
3604 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
3605 | return 0; | |
3606 | err: | |
3607 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); | |
3608 | return err; | |
3609 | } | |
3610 | ||
3611 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, | |
02671e23 | 3612 | struct xdp_buff *xdp, struct bpf_prog *xdp_prog) |
9c270af3 | 3613 | { |
0b19cc0a | 3614 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
f6069b9a | 3615 | struct bpf_map *map = READ_ONCE(ri->map); |
4b55cf29 | 3616 | u32 index = ri->tgt_index; |
9c270af3 JDB |
3617 | struct net_device *fwd; |
3618 | int err = 0; | |
3619 | ||
f6069b9a DB |
3620 | if (map) |
3621 | return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, | |
3622 | map); | |
4b55cf29 | 3623 | ri->tgt_index = 0; |
9c270af3 JDB |
3624 | fwd = dev_get_by_index_rcu(dev_net(dev), index); |
3625 | if (unlikely(!fwd)) { | |
3626 | err = -EINVAL; | |
f5836ca5 | 3627 | goto err; |
2facaad6 JDB |
3628 | } |
3629 | ||
d8d7218a TM |
3630 | err = xdp_ok_fwd_dev(fwd, skb->len); |
3631 | if (unlikely(err)) | |
9c270af3 JDB |
3632 | goto err; |
3633 | ||
2facaad6 | 3634 | skb->dev = fwd; |
9c270af3 | 3635 | _trace_xdp_redirect(dev, xdp_prog, index); |
02671e23 | 3636 | generic_xdp_tx(skb, xdp_prog); |
f5836ca5 JDB |
3637 | return 0; |
3638 | err: | |
9c270af3 | 3639 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); |
2facaad6 | 3640 | return err; |
6103aa96 | 3641 | } |
6103aa96 | 3642 | |
814abfab JF |
3643 | BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
3644 | { | |
0b19cc0a | 3645 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
814abfab JF |
3646 | |
3647 | if (unlikely(flags)) | |
3648 | return XDP_ABORTED; | |
3649 | ||
814abfab | 3650 | ri->flags = flags; |
4b55cf29 | 3651 | ri->tgt_index = ifindex; |
43e74c02 | 3652 | ri->tgt_value = NULL; |
f6069b9a | 3653 | WRITE_ONCE(ri->map, NULL); |
e4a8e817 | 3654 | |
814abfab JF |
3655 | return XDP_REDIRECT; |
3656 | } | |
3657 | ||
3658 | static const struct bpf_func_proto bpf_xdp_redirect_proto = { | |
3659 | .func = bpf_xdp_redirect, | |
3660 | .gpl_only = false, | |
3661 | .ret_type = RET_INTEGER, | |
3662 | .arg1_type = ARG_ANYTHING, | |
3663 | .arg2_type = ARG_ANYTHING, | |
3664 | }; | |
3665 | ||
f6069b9a DB |
3666 | BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, |
3667 | u64, flags) | |
e4a8e817 | 3668 | { |
0b19cc0a | 3669 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
e4a8e817 | 3670 | |
43e74c02 THJ |
3671 | /* Lower bits of the flags are used as return code on lookup failure */ |
3672 | if (unlikely(flags > XDP_TX)) | |
e4a8e817 DB |
3673 | return XDP_ABORTED; |
3674 | ||
43e74c02 THJ |
3675 | ri->tgt_value = __xdp_map_lookup_elem(map, ifindex); |
3676 | if (unlikely(!ri->tgt_value)) { | |
3677 | /* If the lookup fails we want to clear out the state in the | |
3678 | * redirect_info struct completely, so that if an eBPF program | |
3679 | * performs multiple lookups, the last one always takes | |
3680 | * precedence. | |
3681 | */ | |
3682 | WRITE_ONCE(ri->map, NULL); | |
3683 | return flags; | |
3684 | } | |
3685 | ||
e4a8e817 | 3686 | ri->flags = flags; |
4b55cf29 | 3687 | ri->tgt_index = ifindex; |
f6069b9a | 3688 | WRITE_ONCE(ri->map, map); |
e4a8e817 DB |
3689 | |
3690 | return XDP_REDIRECT; | |
3691 | } | |
3692 | ||
3693 | static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { | |
3694 | .func = bpf_xdp_redirect_map, | |
3695 | .gpl_only = false, | |
3696 | .ret_type = RET_INTEGER, | |
3697 | .arg1_type = ARG_CONST_MAP_PTR, | |
3698 | .arg2_type = ARG_ANYTHING, | |
3699 | .arg3_type = ARG_ANYTHING, | |
3700 | }; | |
3701 | ||
555c8a86 | 3702 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 3703 | unsigned long off, unsigned long len) |
555c8a86 | 3704 | { |
aa7145c1 | 3705 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
3706 | |
3707 | if (unlikely(!ptr)) | |
3708 | return len; | |
3709 | if (ptr != dst_buff) | |
3710 | memcpy(dst_buff, ptr, len); | |
3711 | ||
3712 | return 0; | |
3713 | } | |
3714 | ||
f3694e00 DB |
3715 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
3716 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 3717 | { |
555c8a86 | 3718 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
3719 | |
3720 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
3721 | return -EINVAL; | |
a7658e1a | 3722 | if (unlikely(!skb || skb_size > skb->len)) |
555c8a86 DB |
3723 | return -EFAULT; |
3724 | ||
3725 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
3726 | bpf_skb_copy); | |
3727 | } | |
3728 | ||
3729 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
3730 | .func = bpf_skb_event_output, | |
3731 | .gpl_only = true, | |
3732 | .ret_type = RET_INTEGER, | |
3733 | .arg1_type = ARG_PTR_TO_CTX, | |
3734 | .arg2_type = ARG_CONST_MAP_PTR, | |
3735 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 3736 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 3737 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
555c8a86 DB |
3738 | }; |
3739 | ||
9cc31b3a | 3740 | static int bpf_skb_output_btf_ids[5]; |
a7658e1a AS |
3741 | const struct bpf_func_proto bpf_skb_output_proto = { |
3742 | .func = bpf_skb_event_output, | |
3743 | .gpl_only = true, | |
3744 | .ret_type = RET_INTEGER, | |
3745 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
3746 | .arg2_type = ARG_CONST_MAP_PTR, | |
3747 | .arg3_type = ARG_ANYTHING, | |
3748 | .arg4_type = ARG_PTR_TO_MEM, | |
3749 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
3750 | .btf_id = bpf_skb_output_btf_ids, | |
3751 | }; | |
3752 | ||
c6c33454 DB |
3753 | static unsigned short bpf_tunnel_key_af(u64 flags) |
3754 | { | |
3755 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
3756 | } | |
3757 | ||
f3694e00 DB |
3758 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
3759 | u32, size, u64, flags) | |
d3aa45ce | 3760 | { |
c6c33454 DB |
3761 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3762 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
3763 | void *to_orig = to; |
3764 | int err; | |
d3aa45ce | 3765 | |
074f528e DB |
3766 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
3767 | err = -EINVAL; | |
3768 | goto err_clear; | |
3769 | } | |
3770 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
3771 | err = -EPROTO; | |
3772 | goto err_clear; | |
3773 | } | |
c6c33454 | 3774 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 3775 | err = -EINVAL; |
c6c33454 | 3776 | switch (size) { |
4018ab18 | 3777 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3778 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 3779 | goto set_compat; |
c6c33454 DB |
3780 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3781 | /* Fixup deprecated structure layouts here, so we have | |
3782 | * a common path later on. | |
3783 | */ | |
3784 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 3785 | goto err_clear; |
4018ab18 | 3786 | set_compat: |
c6c33454 DB |
3787 | to = (struct bpf_tunnel_key *)compat; |
3788 | break; | |
3789 | default: | |
074f528e | 3790 | goto err_clear; |
c6c33454 DB |
3791 | } |
3792 | } | |
d3aa45ce AS |
3793 | |
3794 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
3795 | to->tunnel_tos = info->key.tos; |
3796 | to->tunnel_ttl = info->key.ttl; | |
1fbc2e0c | 3797 | to->tunnel_ext = 0; |
c6c33454 | 3798 | |
4018ab18 | 3799 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
3800 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
3801 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
3802 | to->tunnel_label = be32_to_cpu(info->key.label); |
3803 | } else { | |
c6c33454 | 3804 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
1fbc2e0c DB |
3805 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
3806 | to->tunnel_label = 0; | |
4018ab18 | 3807 | } |
c6c33454 DB |
3808 | |
3809 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 3810 | memcpy(to_orig, to, size); |
d3aa45ce AS |
3811 | |
3812 | return 0; | |
074f528e DB |
3813 | err_clear: |
3814 | memset(to_orig, 0, size); | |
3815 | return err; | |
d3aa45ce AS |
3816 | } |
3817 | ||
577c50aa | 3818 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
3819 | .func = bpf_skb_get_tunnel_key, |
3820 | .gpl_only = false, | |
3821 | .ret_type = RET_INTEGER, | |
3822 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3823 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3824 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3825 | .arg4_type = ARG_ANYTHING, |
3826 | }; | |
3827 | ||
f3694e00 | 3828 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 3829 | { |
14ca0751 | 3830 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 3831 | int err; |
14ca0751 DB |
3832 | |
3833 | if (unlikely(!info || | |
074f528e DB |
3834 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
3835 | err = -ENOENT; | |
3836 | goto err_clear; | |
3837 | } | |
3838 | if (unlikely(size < info->options_len)) { | |
3839 | err = -ENOMEM; | |
3840 | goto err_clear; | |
3841 | } | |
14ca0751 DB |
3842 | |
3843 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
3844 | if (size > info->options_len) |
3845 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
3846 | |
3847 | return info->options_len; | |
074f528e DB |
3848 | err_clear: |
3849 | memset(to, 0, size); | |
3850 | return err; | |
14ca0751 DB |
3851 | } |
3852 | ||
3853 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
3854 | .func = bpf_skb_get_tunnel_opt, | |
3855 | .gpl_only = false, | |
3856 | .ret_type = RET_INTEGER, | |
3857 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3858 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3859 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3860 | }; |
3861 | ||
d3aa45ce AS |
3862 | static struct metadata_dst __percpu *md_dst; |
3863 | ||
f3694e00 DB |
3864 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
3865 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 3866 | { |
d3aa45ce | 3867 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 3868 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
3869 | struct ip_tunnel_info *info; |
3870 | ||
22080870 | 3871 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
77a5196a | 3872 | BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) |
d3aa45ce | 3873 | return -EINVAL; |
c6c33454 DB |
3874 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
3875 | switch (size) { | |
4018ab18 | 3876 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3877 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
3878 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3879 | /* Fixup deprecated structure layouts here, so we have | |
3880 | * a common path later on. | |
3881 | */ | |
3882 | memcpy(compat, from, size); | |
3883 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 3884 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
3885 | break; |
3886 | default: | |
3887 | return -EINVAL; | |
3888 | } | |
3889 | } | |
c0e760c9 DB |
3890 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
3891 | from->tunnel_ext)) | |
4018ab18 | 3892 | return -EINVAL; |
d3aa45ce AS |
3893 | |
3894 | skb_dst_drop(skb); | |
3895 | dst_hold((struct dst_entry *) md); | |
3896 | skb_dst_set(skb, (struct dst_entry *) md); | |
3897 | ||
3898 | info = &md->u.tun_info; | |
5540fbf4 | 3899 | memset(info, 0, sizeof(*info)); |
d3aa45ce | 3900 | info->mode = IP_TUNNEL_INFO_TX; |
c6c33454 | 3901 | |
db3c6139 | 3902 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
3903 | if (flags & BPF_F_DONT_FRAGMENT) |
3904 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
792f3dd6 WT |
3905 | if (flags & BPF_F_ZERO_CSUM_TX) |
3906 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
77a5196a WT |
3907 | if (flags & BPF_F_SEQ_NUMBER) |
3908 | info->key.tun_flags |= TUNNEL_SEQ; | |
22080870 | 3909 | |
d3aa45ce | 3910 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
3911 | info->key.tos = from->tunnel_tos; |
3912 | info->key.ttl = from->tunnel_ttl; | |
3913 | ||
3914 | if (flags & BPF_F_TUNINFO_IPV6) { | |
3915 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
3916 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
3917 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
3918 | info->key.label = cpu_to_be32(from->tunnel_label) & |
3919 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
3920 | } else { |
3921 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
3922 | } | |
d3aa45ce AS |
3923 | |
3924 | return 0; | |
3925 | } | |
3926 | ||
577c50aa | 3927 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
3928 | .func = bpf_skb_set_tunnel_key, |
3929 | .gpl_only = false, | |
3930 | .ret_type = RET_INTEGER, | |
3931 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3932 | .arg2_type = ARG_PTR_TO_MEM, |
3933 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3934 | .arg4_type = ARG_ANYTHING, |
3935 | }; | |
3936 | ||
f3694e00 DB |
3937 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
3938 | const u8 *, from, u32, size) | |
14ca0751 | 3939 | { |
14ca0751 DB |
3940 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3941 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
3942 | ||
3943 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
3944 | return -EINVAL; | |
fca5fdf6 | 3945 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
3946 | return -ENOMEM; |
3947 | ||
256c87c1 | 3948 | ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); |
14ca0751 DB |
3949 | |
3950 | return 0; | |
3951 | } | |
3952 | ||
3953 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
3954 | .func = bpf_skb_set_tunnel_opt, | |
3955 | .gpl_only = false, | |
3956 | .ret_type = RET_INTEGER, | |
3957 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3958 | .arg2_type = ARG_PTR_TO_MEM, |
3959 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3960 | }; |
3961 | ||
3962 | static const struct bpf_func_proto * | |
3963 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
3964 | { |
3965 | if (!md_dst) { | |
d66f2b91 JK |
3966 | struct metadata_dst __percpu *tmp; |
3967 | ||
3968 | tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, | |
3969 | METADATA_IP_TUNNEL, | |
3970 | GFP_KERNEL); | |
3971 | if (!tmp) | |
d3aa45ce | 3972 | return NULL; |
d66f2b91 JK |
3973 | if (cmpxchg(&md_dst, NULL, tmp)) |
3974 | metadata_dst_free_percpu(tmp); | |
d3aa45ce | 3975 | } |
14ca0751 DB |
3976 | |
3977 | switch (which) { | |
3978 | case BPF_FUNC_skb_set_tunnel_key: | |
3979 | return &bpf_skb_set_tunnel_key_proto; | |
3980 | case BPF_FUNC_skb_set_tunnel_opt: | |
3981 | return &bpf_skb_set_tunnel_opt_proto; | |
3982 | default: | |
3983 | return NULL; | |
3984 | } | |
d3aa45ce AS |
3985 | } |
3986 | ||
f3694e00 DB |
3987 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
3988 | u32, idx) | |
4a482f34 | 3989 | { |
4a482f34 MKL |
3990 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
3991 | struct cgroup *cgrp; | |
3992 | struct sock *sk; | |
4a482f34 | 3993 | |
2d48c5f9 | 3994 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
3995 | if (!sk || !sk_fullsock(sk)) |
3996 | return -ENOENT; | |
f3694e00 | 3997 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
3998 | return -E2BIG; |
3999 | ||
f3694e00 | 4000 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
4001 | if (unlikely(!cgrp)) |
4002 | return -EAGAIN; | |
4003 | ||
54fd9c2d | 4004 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
4005 | } |
4006 | ||
747ea55e DB |
4007 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
4008 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
4009 | .gpl_only = false, |
4010 | .ret_type = RET_INTEGER, | |
4011 | .arg1_type = ARG_PTR_TO_CTX, | |
4012 | .arg2_type = ARG_CONST_MAP_PTR, | |
4013 | .arg3_type = ARG_ANYTHING, | |
4014 | }; | |
4a482f34 | 4015 | |
cb20b08e DB |
4016 | #ifdef CONFIG_SOCK_CGROUP_DATA |
4017 | BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) | |
4018 | { | |
4019 | struct sock *sk = skb_to_full_sk(skb); | |
4020 | struct cgroup *cgrp; | |
4021 | ||
4022 | if (!sk || !sk_fullsock(sk)) | |
4023 | return 0; | |
4024 | ||
4025 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); | |
74321038 | 4026 | return cgroup_id(cgrp); |
cb20b08e DB |
4027 | } |
4028 | ||
4029 | static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { | |
4030 | .func = bpf_skb_cgroup_id, | |
4031 | .gpl_only = false, | |
4032 | .ret_type = RET_INTEGER, | |
4033 | .arg1_type = ARG_PTR_TO_CTX, | |
4034 | }; | |
77236281 AI |
4035 | |
4036 | BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, | |
4037 | ancestor_level) | |
4038 | { | |
4039 | struct sock *sk = skb_to_full_sk(skb); | |
4040 | struct cgroup *ancestor; | |
4041 | struct cgroup *cgrp; | |
4042 | ||
4043 | if (!sk || !sk_fullsock(sk)) | |
4044 | return 0; | |
4045 | ||
4046 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); | |
4047 | ancestor = cgroup_ancestor(cgrp, ancestor_level); | |
4048 | if (!ancestor) | |
4049 | return 0; | |
4050 | ||
74321038 | 4051 | return cgroup_id(ancestor); |
77236281 AI |
4052 | } |
4053 | ||
4054 | static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { | |
4055 | .func = bpf_skb_ancestor_cgroup_id, | |
4056 | .gpl_only = false, | |
4057 | .ret_type = RET_INTEGER, | |
4058 | .arg1_type = ARG_PTR_TO_CTX, | |
4059 | .arg2_type = ARG_ANYTHING, | |
4060 | }; | |
cb20b08e DB |
4061 | #endif |
4062 | ||
4de16969 DB |
4063 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
4064 | unsigned long off, unsigned long len) | |
4065 | { | |
4066 | memcpy(dst_buff, src_buff + off, len); | |
4067 | return 0; | |
4068 | } | |
4069 | ||
f3694e00 DB |
4070 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
4071 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 4072 | { |
4de16969 | 4073 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
4074 | |
4075 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
4076 | return -EINVAL; | |
d831ee84 EC |
4077 | if (unlikely(!xdp || |
4078 | xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
4de16969 DB |
4079 | return -EFAULT; |
4080 | ||
9c471370 MKL |
4081 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
4082 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
4083 | } |
4084 | ||
4085 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
4086 | .func = bpf_xdp_event_output, | |
4087 | .gpl_only = true, | |
4088 | .ret_type = RET_INTEGER, | |
4089 | .arg1_type = ARG_PTR_TO_CTX, | |
4090 | .arg2_type = ARG_CONST_MAP_PTR, | |
4091 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 4092 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 4093 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
4de16969 DB |
4094 | }; |
4095 | ||
d831ee84 EC |
4096 | static int bpf_xdp_output_btf_ids[5]; |
4097 | const struct bpf_func_proto bpf_xdp_output_proto = { | |
4098 | .func = bpf_xdp_event_output, | |
4099 | .gpl_only = true, | |
4100 | .ret_type = RET_INTEGER, | |
4101 | .arg1_type = ARG_PTR_TO_BTF_ID, | |
4102 | .arg2_type = ARG_CONST_MAP_PTR, | |
4103 | .arg3_type = ARG_ANYTHING, | |
4104 | .arg4_type = ARG_PTR_TO_MEM, | |
4105 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
4106 | .btf_id = bpf_xdp_output_btf_ids, | |
4107 | }; | |
4108 | ||
91b8270f CF |
4109 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
4110 | { | |
4111 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
4112 | } | |
4113 | ||
4114 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
4115 | .func = bpf_get_socket_cookie, | |
4116 | .gpl_only = false, | |
4117 | .ret_type = RET_INTEGER, | |
4118 | .arg1_type = ARG_PTR_TO_CTX, | |
4119 | }; | |
4120 | ||
d692f113 AI |
4121 | BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) |
4122 | { | |
4123 | return sock_gen_cookie(ctx->sk); | |
4124 | } | |
4125 | ||
4126 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { | |
4127 | .func = bpf_get_socket_cookie_sock_addr, | |
4128 | .gpl_only = false, | |
4129 | .ret_type = RET_INTEGER, | |
4130 | .arg1_type = ARG_PTR_TO_CTX, | |
4131 | }; | |
4132 | ||
0e53d9e5 DB |
4133 | BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) |
4134 | { | |
4135 | return sock_gen_cookie(ctx); | |
4136 | } | |
4137 | ||
4138 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { | |
4139 | .func = bpf_get_socket_cookie_sock, | |
4140 | .gpl_only = false, | |
4141 | .ret_type = RET_INTEGER, | |
4142 | .arg1_type = ARG_PTR_TO_CTX, | |
4143 | }; | |
4144 | ||
d692f113 AI |
4145 | BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) |
4146 | { | |
4147 | return sock_gen_cookie(ctx->sk); | |
4148 | } | |
4149 | ||
4150 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { | |
4151 | .func = bpf_get_socket_cookie_sock_ops, | |
4152 | .gpl_only = false, | |
4153 | .ret_type = RET_INTEGER, | |
4154 | .arg1_type = ARG_PTR_TO_CTX, | |
4155 | }; | |
4156 | ||
f318903c DB |
4157 | static u64 __bpf_get_netns_cookie(struct sock *sk) |
4158 | { | |
4159 | #ifdef CONFIG_NET_NS | |
4160 | return net_gen_cookie(sk ? sk->sk_net.net : &init_net); | |
4161 | #else | |
4162 | return 0; | |
4163 | #endif | |
4164 | } | |
4165 | ||
4166 | BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) | |
4167 | { | |
4168 | return __bpf_get_netns_cookie(ctx); | |
4169 | } | |
4170 | ||
4171 | static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { | |
4172 | .func = bpf_get_netns_cookie_sock, | |
4173 | .gpl_only = false, | |
4174 | .ret_type = RET_INTEGER, | |
4175 | .arg1_type = ARG_PTR_TO_CTX_OR_NULL, | |
4176 | }; | |
4177 | ||
4178 | BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) | |
4179 | { | |
4180 | return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); | |
4181 | } | |
4182 | ||
4183 | static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { | |
4184 | .func = bpf_get_netns_cookie_sock_addr, | |
4185 | .gpl_only = false, | |
4186 | .ret_type = RET_INTEGER, | |
4187 | .arg1_type = ARG_PTR_TO_CTX_OR_NULL, | |
4188 | }; | |
4189 | ||
6acc5c29 CF |
4190 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
4191 | { | |
4192 | struct sock *sk = sk_to_full_sk(skb->sk); | |
4193 | kuid_t kuid; | |
4194 | ||
4195 | if (!sk || !sk_fullsock(sk)) | |
4196 | return overflowuid; | |
4197 | kuid = sock_net_uid(sock_net(sk), sk); | |
4198 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
4199 | } | |
4200 | ||
4201 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
4202 | .func = bpf_get_socket_uid, | |
4203 | .gpl_only = false, | |
4204 | .ret_type = RET_INTEGER, | |
4205 | .arg1_type = ARG_PTR_TO_CTX, | |
4206 | }; | |
4207 | ||
fcf752ea DB |
4208 | BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map, u64, flags, |
4209 | void *, data, u64, size) | |
a5a3a828 SV |
4210 | { |
4211 | if (unlikely(flags & ~(BPF_F_INDEX_MASK))) | |
4212 | return -EINVAL; | |
4213 | ||
4214 | return bpf_event_output(map, flags, data, size, NULL, 0, NULL); | |
4215 | } | |
4216 | ||
fcf752ea DB |
4217 | static const struct bpf_func_proto bpf_event_output_data_proto = { |
4218 | .func = bpf_event_output_data, | |
a5a3a828 SV |
4219 | .gpl_only = true, |
4220 | .ret_type = RET_INTEGER, | |
4221 | .arg1_type = ARG_PTR_TO_CTX, | |
4222 | .arg2_type = ARG_CONST_MAP_PTR, | |
4223 | .arg3_type = ARG_ANYTHING, | |
4224 | .arg4_type = ARG_PTR_TO_MEM, | |
4225 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, | |
4226 | }; | |
4227 | ||
8c4b4c7e LB |
4228 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
4229 | int, level, int, optname, char *, optval, int, optlen) | |
4230 | { | |
4231 | struct sock *sk = bpf_sock->sk; | |
4232 | int ret = 0; | |
4233 | int val; | |
4234 | ||
4235 | if (!sk_fullsock(sk)) | |
4236 | return -EINVAL; | |
4237 | ||
4238 | if (level == SOL_SOCKET) { | |
4239 | if (optlen != sizeof(int)) | |
4240 | return -EINVAL; | |
4241 | val = *((int *)optval); | |
4242 | ||
4243 | /* Only some socketops are supported */ | |
4244 | switch (optname) { | |
4245 | case SO_RCVBUF: | |
c9e45767 | 4246 | val = min_t(u32, val, sysctl_rmem_max); |
8c4b4c7e | 4247 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
ebb3b78d ED |
4248 | WRITE_ONCE(sk->sk_rcvbuf, |
4249 | max_t(int, val * 2, SOCK_MIN_RCVBUF)); | |
8c4b4c7e LB |
4250 | break; |
4251 | case SO_SNDBUF: | |
c9e45767 | 4252 | val = min_t(u32, val, sysctl_wmem_max); |
8c4b4c7e | 4253 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
e292f05e ED |
4254 | WRITE_ONCE(sk->sk_sndbuf, |
4255 | max_t(int, val * 2, SOCK_MIN_SNDBUF)); | |
8c4b4c7e | 4256 | break; |
76a9ebe8 | 4257 | case SO_MAX_PACING_RATE: /* 32bit version */ |
e224c390 YC |
4258 | if (val != ~0U) |
4259 | cmpxchg(&sk->sk_pacing_status, | |
4260 | SK_PACING_NONE, | |
4261 | SK_PACING_NEEDED); | |
76a9ebe8 | 4262 | sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; |
8c4b4c7e LB |
4263 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
4264 | sk->sk_max_pacing_rate); | |
4265 | break; | |
4266 | case SO_PRIORITY: | |
4267 | sk->sk_priority = val; | |
4268 | break; | |
4269 | case SO_RCVLOWAT: | |
4270 | if (val < 0) | |
4271 | val = INT_MAX; | |
eac66402 | 4272 | WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
8c4b4c7e LB |
4273 | break; |
4274 | case SO_MARK: | |
f4924f24 PO |
4275 | if (sk->sk_mark != val) { |
4276 | sk->sk_mark = val; | |
4277 | sk_dst_reset(sk); | |
4278 | } | |
8c4b4c7e LB |
4279 | break; |
4280 | default: | |
4281 | ret = -EINVAL; | |
4282 | } | |
a5192c52 | 4283 | #ifdef CONFIG_INET |
6f5c39fa NS |
4284 | } else if (level == SOL_IP) { |
4285 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
4286 | return -EINVAL; | |
4287 | ||
4288 | val = *((int *)optval); | |
4289 | /* Only some options are supported */ | |
4290 | switch (optname) { | |
4291 | case IP_TOS: | |
4292 | if (val < -1 || val > 0xff) { | |
4293 | ret = -EINVAL; | |
4294 | } else { | |
4295 | struct inet_sock *inet = inet_sk(sk); | |
4296 | ||
4297 | if (val == -1) | |
4298 | val = 0; | |
4299 | inet->tos = val; | |
4300 | } | |
4301 | break; | |
4302 | default: | |
4303 | ret = -EINVAL; | |
4304 | } | |
6f9bd3d7 LB |
4305 | #if IS_ENABLED(CONFIG_IPV6) |
4306 | } else if (level == SOL_IPV6) { | |
4307 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
4308 | return -EINVAL; | |
4309 | ||
4310 | val = *((int *)optval); | |
4311 | /* Only some options are supported */ | |
4312 | switch (optname) { | |
4313 | case IPV6_TCLASS: | |
4314 | if (val < -1 || val > 0xff) { | |
4315 | ret = -EINVAL; | |
4316 | } else { | |
4317 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4318 | ||
4319 | if (val == -1) | |
4320 | val = 0; | |
4321 | np->tclass = val; | |
4322 | } | |
4323 | break; | |
4324 | default: | |
4325 | ret = -EINVAL; | |
4326 | } | |
4327 | #endif | |
8c4b4c7e LB |
4328 | } else if (level == SOL_TCP && |
4329 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
4330 | if (optname == TCP_CONGESTION) { |
4331 | char name[TCP_CA_NAME_MAX]; | |
ebfa00c5 | 4332 | bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; |
91b5b21c LB |
4333 | |
4334 | strncpy(name, optval, min_t(long, optlen, | |
4335 | TCP_CA_NAME_MAX-1)); | |
4336 | name[TCP_CA_NAME_MAX-1] = 0; | |
6f9bd3d7 | 4337 | ret = tcp_set_congestion_control(sk, name, false, |
8d650cde | 4338 | reinit, true); |
91b5b21c | 4339 | } else { |
fc747810 LB |
4340 | struct tcp_sock *tp = tcp_sk(sk); |
4341 | ||
4342 | if (optlen != sizeof(int)) | |
4343 | return -EINVAL; | |
4344 | ||
4345 | val = *((int *)optval); | |
4346 | /* Only some options are supported */ | |
4347 | switch (optname) { | |
4348 | case TCP_BPF_IW: | |
31aa6503 | 4349 | if (val <= 0 || tp->data_segs_out > tp->syn_data) |
fc747810 LB |
4350 | ret = -EINVAL; |
4351 | else | |
4352 | tp->snd_cwnd = val; | |
4353 | break; | |
13bf9641 LB |
4354 | case TCP_BPF_SNDCWND_CLAMP: |
4355 | if (val <= 0) { | |
4356 | ret = -EINVAL; | |
4357 | } else { | |
4358 | tp->snd_cwnd_clamp = val; | |
4359 | tp->snd_ssthresh = val; | |
4360 | } | |
6d3f06a0 | 4361 | break; |
1e215300 NS |
4362 | case TCP_SAVE_SYN: |
4363 | if (val < 0 || val > 1) | |
4364 | ret = -EINVAL; | |
4365 | else | |
4366 | tp->save_syn = val; | |
4367 | break; | |
fc747810 LB |
4368 | default: |
4369 | ret = -EINVAL; | |
4370 | } | |
91b5b21c | 4371 | } |
91b5b21c | 4372 | #endif |
8c4b4c7e LB |
4373 | } else { |
4374 | ret = -EINVAL; | |
4375 | } | |
4376 | return ret; | |
4377 | } | |
4378 | ||
4379 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
4380 | .func = bpf_setsockopt, | |
cd86d1fd | 4381 | .gpl_only = false, |
8c4b4c7e LB |
4382 | .ret_type = RET_INTEGER, |
4383 | .arg1_type = ARG_PTR_TO_CTX, | |
4384 | .arg2_type = ARG_ANYTHING, | |
4385 | .arg3_type = ARG_ANYTHING, | |
4386 | .arg4_type = ARG_PTR_TO_MEM, | |
4387 | .arg5_type = ARG_CONST_SIZE, | |
4388 | }; | |
4389 | ||
cd86d1fd LB |
4390 | BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
4391 | int, level, int, optname, char *, optval, int, optlen) | |
4392 | { | |
4393 | struct sock *sk = bpf_sock->sk; | |
cd86d1fd LB |
4394 | |
4395 | if (!sk_fullsock(sk)) | |
4396 | goto err_clear; | |
cd86d1fd LB |
4397 | #ifdef CONFIG_INET |
4398 | if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { | |
1edb6e03 AR |
4399 | struct inet_connection_sock *icsk; |
4400 | struct tcp_sock *tp; | |
4401 | ||
1e215300 NS |
4402 | switch (optname) { |
4403 | case TCP_CONGESTION: | |
4404 | icsk = inet_csk(sk); | |
cd86d1fd LB |
4405 | |
4406 | if (!icsk->icsk_ca_ops || optlen <= 1) | |
4407 | goto err_clear; | |
4408 | strncpy(optval, icsk->icsk_ca_ops->name, optlen); | |
4409 | optval[optlen - 1] = 0; | |
1e215300 NS |
4410 | break; |
4411 | case TCP_SAVED_SYN: | |
4412 | tp = tcp_sk(sk); | |
4413 | ||
4414 | if (optlen <= 0 || !tp->saved_syn || | |
4415 | optlen > tp->saved_syn[0]) | |
4416 | goto err_clear; | |
4417 | memcpy(optval, tp->saved_syn + 1, optlen); | |
4418 | break; | |
4419 | default: | |
cd86d1fd LB |
4420 | goto err_clear; |
4421 | } | |
6f5c39fa NS |
4422 | } else if (level == SOL_IP) { |
4423 | struct inet_sock *inet = inet_sk(sk); | |
4424 | ||
4425 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
4426 | goto err_clear; | |
4427 | ||
4428 | /* Only some options are supported */ | |
4429 | switch (optname) { | |
4430 | case IP_TOS: | |
4431 | *((int *)optval) = (int)inet->tos; | |
4432 | break; | |
4433 | default: | |
4434 | goto err_clear; | |
4435 | } | |
6f9bd3d7 LB |
4436 | #if IS_ENABLED(CONFIG_IPV6) |
4437 | } else if (level == SOL_IPV6) { | |
4438 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4439 | ||
4440 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
4441 | goto err_clear; | |
4442 | ||
4443 | /* Only some options are supported */ | |
4444 | switch (optname) { | |
4445 | case IPV6_TCLASS: | |
4446 | *((int *)optval) = (int)np->tclass; | |
4447 | break; | |
4448 | default: | |
4449 | goto err_clear; | |
4450 | } | |
4451 | #endif | |
cd86d1fd LB |
4452 | } else { |
4453 | goto err_clear; | |
4454 | } | |
aa2bc739 | 4455 | return 0; |
cd86d1fd LB |
4456 | #endif |
4457 | err_clear: | |
4458 | memset(optval, 0, optlen); | |
4459 | return -EINVAL; | |
4460 | } | |
4461 | ||
4462 | static const struct bpf_func_proto bpf_getsockopt_proto = { | |
4463 | .func = bpf_getsockopt, | |
4464 | .gpl_only = false, | |
4465 | .ret_type = RET_INTEGER, | |
4466 | .arg1_type = ARG_PTR_TO_CTX, | |
4467 | .arg2_type = ARG_ANYTHING, | |
4468 | .arg3_type = ARG_ANYTHING, | |
4469 | .arg4_type = ARG_PTR_TO_UNINIT_MEM, | |
4470 | .arg5_type = ARG_CONST_SIZE, | |
4471 | }; | |
4472 | ||
b13d8807 LB |
4473 | BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, |
4474 | int, argval) | |
4475 | { | |
4476 | struct sock *sk = bpf_sock->sk; | |
4477 | int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; | |
4478 | ||
a7dcdf6e | 4479 | if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) |
b13d8807 LB |
4480 | return -EINVAL; |
4481 | ||
725721a6 | 4482 | tcp_sk(sk)->bpf_sock_ops_cb_flags = val; |
b13d8807 LB |
4483 | |
4484 | return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); | |
b13d8807 LB |
4485 | } |
4486 | ||
4487 | static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { | |
4488 | .func = bpf_sock_ops_cb_flags_set, | |
4489 | .gpl_only = false, | |
4490 | .ret_type = RET_INTEGER, | |
4491 | .arg1_type = ARG_PTR_TO_CTX, | |
4492 | .arg2_type = ARG_ANYTHING, | |
4493 | }; | |
4494 | ||
d74bad4e AI |
4495 | const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; |
4496 | EXPORT_SYMBOL_GPL(ipv6_bpf_stub); | |
4497 | ||
4498 | BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, | |
4499 | int, addr_len) | |
4500 | { | |
4501 | #ifdef CONFIG_INET | |
4502 | struct sock *sk = ctx->sk; | |
4503 | int err; | |
4504 | ||
4505 | /* Binding to port can be expensive so it's prohibited in the helper. | |
4506 | * Only binding to IP is supported. | |
4507 | */ | |
4508 | err = -EINVAL; | |
ba024f25 TH |
4509 | if (addr_len < offsetofend(struct sockaddr, sa_family)) |
4510 | return err; | |
d74bad4e AI |
4511 | if (addr->sa_family == AF_INET) { |
4512 | if (addr_len < sizeof(struct sockaddr_in)) | |
4513 | return err; | |
4514 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
4515 | return err; | |
4516 | return __inet_bind(sk, addr, addr_len, true, false); | |
4517 | #if IS_ENABLED(CONFIG_IPV6) | |
4518 | } else if (addr->sa_family == AF_INET6) { | |
4519 | if (addr_len < SIN6_LEN_RFC2133) | |
4520 | return err; | |
4521 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
4522 | return err; | |
4523 | /* ipv6_bpf_stub cannot be NULL, since it's called from | |
4524 | * bpf_cgroup_inet6_connect hook and ipv6 is already loaded | |
4525 | */ | |
4526 | return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); | |
4527 | #endif /* CONFIG_IPV6 */ | |
4528 | } | |
4529 | #endif /* CONFIG_INET */ | |
4530 | ||
4531 | return -EAFNOSUPPORT; | |
4532 | } | |
4533 | ||
4534 | static const struct bpf_func_proto bpf_bind_proto = { | |
4535 | .func = bpf_bind, | |
4536 | .gpl_only = false, | |
4537 | .ret_type = RET_INTEGER, | |
4538 | .arg1_type = ARG_PTR_TO_CTX, | |
4539 | .arg2_type = ARG_PTR_TO_MEM, | |
4540 | .arg3_type = ARG_CONST_SIZE, | |
4541 | }; | |
4542 | ||
12bed760 EB |
4543 | #ifdef CONFIG_XFRM |
4544 | BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, | |
4545 | struct bpf_xfrm_state *, to, u32, size, u64, flags) | |
4546 | { | |
4547 | const struct sec_path *sp = skb_sec_path(skb); | |
4548 | const struct xfrm_state *x; | |
4549 | ||
4550 | if (!sp || unlikely(index >= sp->len || flags)) | |
4551 | goto err_clear; | |
4552 | ||
4553 | x = sp->xvec[index]; | |
4554 | ||
4555 | if (unlikely(size != sizeof(struct bpf_xfrm_state))) | |
4556 | goto err_clear; | |
4557 | ||
4558 | to->reqid = x->props.reqid; | |
4559 | to->spi = x->id.spi; | |
4560 | to->family = x->props.family; | |
1fbc2e0c DB |
4561 | to->ext = 0; |
4562 | ||
12bed760 EB |
4563 | if (to->family == AF_INET6) { |
4564 | memcpy(to->remote_ipv6, x->props.saddr.a6, | |
4565 | sizeof(to->remote_ipv6)); | |
4566 | } else { | |
4567 | to->remote_ipv4 = x->props.saddr.a4; | |
1fbc2e0c | 4568 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
12bed760 EB |
4569 | } |
4570 | ||
4571 | return 0; | |
4572 | err_clear: | |
4573 | memset(to, 0, size); | |
4574 | return -EINVAL; | |
4575 | } | |
4576 | ||
4577 | static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { | |
4578 | .func = bpf_skb_get_xfrm_state, | |
4579 | .gpl_only = false, | |
4580 | .ret_type = RET_INTEGER, | |
4581 | .arg1_type = ARG_PTR_TO_CTX, | |
4582 | .arg2_type = ARG_ANYTHING, | |
4583 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
4584 | .arg4_type = ARG_CONST_SIZE, | |
4585 | .arg5_type = ARG_ANYTHING, | |
4586 | }; | |
4587 | #endif | |
4588 | ||
87f5fc7e DA |
4589 | #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) |
4590 | static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, | |
4591 | const struct neighbour *neigh, | |
4592 | const struct net_device *dev) | |
4593 | { | |
4594 | memcpy(params->dmac, neigh->ha, ETH_ALEN); | |
4595 | memcpy(params->smac, dev->dev_addr, ETH_ALEN); | |
4596 | params->h_vlan_TCI = 0; | |
4597 | params->h_vlan_proto = 0; | |
4c79579b | 4598 | params->ifindex = dev->ifindex; |
87f5fc7e | 4599 | |
4c79579b | 4600 | return 0; |
87f5fc7e DA |
4601 | } |
4602 | #endif | |
4603 | ||
4604 | #if IS_ENABLED(CONFIG_INET) | |
4605 | static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4606 | u32 flags, bool check_mtu) |
87f5fc7e | 4607 | { |
eba618ab | 4608 | struct fib_nh_common *nhc; |
87f5fc7e DA |
4609 | struct in_device *in_dev; |
4610 | struct neighbour *neigh; | |
4611 | struct net_device *dev; | |
4612 | struct fib_result res; | |
87f5fc7e DA |
4613 | struct flowi4 fl4; |
4614 | int err; | |
4f74fede | 4615 | u32 mtu; |
87f5fc7e DA |
4616 | |
4617 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4618 | if (unlikely(!dev)) | |
4619 | return -ENODEV; | |
4620 | ||
4621 | /* verify forwarding is enabled on this interface */ | |
4622 | in_dev = __in_dev_get_rcu(dev); | |
4623 | if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) | |
4c79579b | 4624 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4625 | |
4626 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4627 | fl4.flowi4_iif = 1; | |
4628 | fl4.flowi4_oif = params->ifindex; | |
4629 | } else { | |
4630 | fl4.flowi4_iif = params->ifindex; | |
4631 | fl4.flowi4_oif = 0; | |
4632 | } | |
4633 | fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; | |
4634 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
4635 | fl4.flowi4_flags = 0; | |
4636 | ||
4637 | fl4.flowi4_proto = params->l4_protocol; | |
4638 | fl4.daddr = params->ipv4_dst; | |
4639 | fl4.saddr = params->ipv4_src; | |
4640 | fl4.fl4_sport = params->sport; | |
4641 | fl4.fl4_dport = params->dport; | |
4642 | ||
4643 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4644 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4645 | struct fib_table *tb; | |
4646 | ||
4647 | tb = fib_get_table(net, tbid); | |
4648 | if (unlikely(!tb)) | |
4c79579b | 4649 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4650 | |
4651 | err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); | |
4652 | } else { | |
4653 | fl4.flowi4_mark = 0; | |
4654 | fl4.flowi4_secid = 0; | |
4655 | fl4.flowi4_tun_key.tun_id = 0; | |
4656 | fl4.flowi4_uid = sock_net_uid(net, NULL); | |
4657 | ||
4658 | err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); | |
4659 | } | |
4660 | ||
4c79579b DA |
4661 | if (err) { |
4662 | /* map fib lookup errors to RTN_ type */ | |
4663 | if (err == -EINVAL) | |
4664 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4665 | if (err == -EHOSTUNREACH) | |
4666 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4667 | if (err == -EACCES) | |
4668 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4669 | ||
4670 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
4671 | } | |
4672 | ||
4673 | if (res.type != RTN_UNICAST) | |
4674 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
87f5fc7e | 4675 | |
5481d73f | 4676 | if (fib_info_num_path(res.fi) > 1) |
87f5fc7e DA |
4677 | fib_select_path(net, &res, &fl4, NULL); |
4678 | ||
4f74fede DA |
4679 | if (check_mtu) { |
4680 | mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); | |
4681 | if (params->tot_len > mtu) | |
4c79579b | 4682 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4683 | } |
4684 | ||
eba618ab | 4685 | nhc = res.nhc; |
87f5fc7e DA |
4686 | |
4687 | /* do not handle lwt encaps right now */ | |
eba618ab | 4688 | if (nhc->nhc_lwtstate) |
4c79579b | 4689 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e | 4690 | |
eba618ab | 4691 | dev = nhc->nhc_dev; |
87f5fc7e DA |
4692 | |
4693 | params->rt_metric = res.fi->fib_priority; | |
4694 | ||
4695 | /* xdp and cls_bpf programs are run in RCU-bh so | |
4696 | * rcu_read_lock_bh is not needed here | |
4697 | */ | |
6f5f68d0 DA |
4698 | if (likely(nhc->nhc_gw_family != AF_INET6)) { |
4699 | if (nhc->nhc_gw_family) | |
4700 | params->ipv4_dst = nhc->nhc_gw.ipv4; | |
4701 | ||
4702 | neigh = __ipv4_neigh_lookup_noref(dev, | |
4703 | (__force u32)params->ipv4_dst); | |
4704 | } else { | |
4705 | struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; | |
4706 | ||
4707 | params->family = AF_INET6; | |
4708 | *dst = nhc->nhc_gw.ipv6; | |
4709 | neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); | |
4710 | } | |
4711 | ||
4c79579b DA |
4712 | if (!neigh) |
4713 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4714 | |
4c79579b | 4715 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4716 | } |
4717 | #endif | |
4718 | ||
4719 | #if IS_ENABLED(CONFIG_IPV6) | |
4720 | static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4721 | u32 flags, bool check_mtu) |
87f5fc7e DA |
4722 | { |
4723 | struct in6_addr *src = (struct in6_addr *) params->ipv6_src; | |
4724 | struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; | |
e55449e7 | 4725 | struct fib6_result res = {}; |
87f5fc7e DA |
4726 | struct neighbour *neigh; |
4727 | struct net_device *dev; | |
4728 | struct inet6_dev *idev; | |
87f5fc7e DA |
4729 | struct flowi6 fl6; |
4730 | int strict = 0; | |
effda4dd | 4731 | int oif, err; |
4f74fede | 4732 | u32 mtu; |
87f5fc7e DA |
4733 | |
4734 | /* link local addresses are never forwarded */ | |
4735 | if (rt6_need_strict(dst) || rt6_need_strict(src)) | |
4c79579b | 4736 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4737 | |
4738 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4739 | if (unlikely(!dev)) | |
4740 | return -ENODEV; | |
4741 | ||
4742 | idev = __in6_dev_get_safely(dev); | |
56f0f84e | 4743 | if (unlikely(!idev || !idev->cnf.forwarding)) |
4c79579b | 4744 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4745 | |
4746 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4747 | fl6.flowi6_iif = 1; | |
4748 | oif = fl6.flowi6_oif = params->ifindex; | |
4749 | } else { | |
4750 | oif = fl6.flowi6_iif = params->ifindex; | |
4751 | fl6.flowi6_oif = 0; | |
4752 | strict = RT6_LOOKUP_F_HAS_SADDR; | |
4753 | } | |
bd3a08aa | 4754 | fl6.flowlabel = params->flowinfo; |
87f5fc7e DA |
4755 | fl6.flowi6_scope = 0; |
4756 | fl6.flowi6_flags = 0; | |
4757 | fl6.mp_hash = 0; | |
4758 | ||
4759 | fl6.flowi6_proto = params->l4_protocol; | |
4760 | fl6.daddr = *dst; | |
4761 | fl6.saddr = *src; | |
4762 | fl6.fl6_sport = params->sport; | |
4763 | fl6.fl6_dport = params->dport; | |
4764 | ||
4765 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4766 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4767 | struct fib6_table *tb; | |
4768 | ||
4769 | tb = ipv6_stub->fib6_get_table(net, tbid); | |
4770 | if (unlikely(!tb)) | |
4c79579b | 4771 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e | 4772 | |
effda4dd DA |
4773 | err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, |
4774 | strict); | |
87f5fc7e DA |
4775 | } else { |
4776 | fl6.flowi6_mark = 0; | |
4777 | fl6.flowi6_secid = 0; | |
4778 | fl6.flowi6_tun_key.tun_id = 0; | |
4779 | fl6.flowi6_uid = sock_net_uid(net, NULL); | |
4780 | ||
effda4dd | 4781 | err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); |
87f5fc7e DA |
4782 | } |
4783 | ||
effda4dd | 4784 | if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || |
b1d40991 | 4785 | res.f6i == net->ipv6.fib6_null_entry)) |
4c79579b DA |
4786 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
4787 | ||
7d21fec9 DA |
4788 | switch (res.fib6_type) { |
4789 | /* only unicast is forwarded */ | |
4790 | case RTN_UNICAST: | |
4791 | break; | |
4792 | case RTN_BLACKHOLE: | |
4793 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4794 | case RTN_UNREACHABLE: | |
4795 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4796 | case RTN_PROHIBIT: | |
4797 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4798 | default: | |
4c79579b | 4799 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
7d21fec9 | 4800 | } |
87f5fc7e | 4801 | |
b1d40991 DA |
4802 | ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, |
4803 | fl6.flowi6_oif != 0, NULL, strict); | |
87f5fc7e | 4804 | |
4f74fede | 4805 | if (check_mtu) { |
b748f260 | 4806 | mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); |
4f74fede | 4807 | if (params->tot_len > mtu) |
4c79579b | 4808 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4809 | } |
4810 | ||
b1d40991 | 4811 | if (res.nh->fib_nh_lws) |
4c79579b | 4812 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e | 4813 | |
b1d40991 DA |
4814 | if (res.nh->fib_nh_gw_family) |
4815 | *dst = res.nh->fib_nh_gw6; | |
87f5fc7e | 4816 | |
b1d40991 DA |
4817 | dev = res.nh->fib_nh_dev; |
4818 | params->rt_metric = res.f6i->fib6_metric; | |
87f5fc7e DA |
4819 | |
4820 | /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is | |
71df5777 | 4821 | * not needed here. |
87f5fc7e | 4822 | */ |
71df5777 | 4823 | neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); |
4c79579b DA |
4824 | if (!neigh) |
4825 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4826 | |
4c79579b | 4827 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4828 | } |
4829 | #endif | |
4830 | ||
4831 | BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, | |
4832 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4833 | { | |
4834 | if (plen < sizeof(*params)) | |
4835 | return -EINVAL; | |
4836 | ||
9ce64f19 DA |
4837 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4838 | return -EINVAL; | |
4839 | ||
87f5fc7e DA |
4840 | switch (params->family) { |
4841 | #if IS_ENABLED(CONFIG_INET) | |
4842 | case AF_INET: | |
4843 | return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4844 | flags, true); |
87f5fc7e DA |
4845 | #endif |
4846 | #if IS_ENABLED(CONFIG_IPV6) | |
4847 | case AF_INET6: | |
4848 | return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4849 | flags, true); |
87f5fc7e DA |
4850 | #endif |
4851 | } | |
bcece5dc | 4852 | return -EAFNOSUPPORT; |
87f5fc7e DA |
4853 | } |
4854 | ||
4855 | static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { | |
4856 | .func = bpf_xdp_fib_lookup, | |
4857 | .gpl_only = true, | |
4858 | .ret_type = RET_INTEGER, | |
4859 | .arg1_type = ARG_PTR_TO_CTX, | |
4860 | .arg2_type = ARG_PTR_TO_MEM, | |
4861 | .arg3_type = ARG_CONST_SIZE, | |
4862 | .arg4_type = ARG_ANYTHING, | |
4863 | }; | |
4864 | ||
4865 | BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, | |
4866 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4867 | { | |
4f74fede | 4868 | struct net *net = dev_net(skb->dev); |
4c79579b | 4869 | int rc = -EAFNOSUPPORT; |
4f74fede | 4870 | |
87f5fc7e DA |
4871 | if (plen < sizeof(*params)) |
4872 | return -EINVAL; | |
4873 | ||
9ce64f19 DA |
4874 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4875 | return -EINVAL; | |
4876 | ||
87f5fc7e DA |
4877 | switch (params->family) { |
4878 | #if IS_ENABLED(CONFIG_INET) | |
4879 | case AF_INET: | |
4c79579b | 4880 | rc = bpf_ipv4_fib_lookup(net, params, flags, false); |
4f74fede | 4881 | break; |
87f5fc7e DA |
4882 | #endif |
4883 | #if IS_ENABLED(CONFIG_IPV6) | |
4884 | case AF_INET6: | |
4c79579b | 4885 | rc = bpf_ipv6_fib_lookup(net, params, flags, false); |
4f74fede | 4886 | break; |
87f5fc7e DA |
4887 | #endif |
4888 | } | |
4f74fede | 4889 | |
4c79579b | 4890 | if (!rc) { |
4f74fede DA |
4891 | struct net_device *dev; |
4892 | ||
4c79579b | 4893 | dev = dev_get_by_index_rcu(net, params->ifindex); |
4f74fede | 4894 | if (!is_skb_forwardable(dev, skb)) |
4c79579b | 4895 | rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4896 | } |
4897 | ||
4c79579b | 4898 | return rc; |
87f5fc7e DA |
4899 | } |
4900 | ||
4901 | static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { | |
4902 | .func = bpf_skb_fib_lookup, | |
4903 | .gpl_only = true, | |
4904 | .ret_type = RET_INTEGER, | |
4905 | .arg1_type = ARG_PTR_TO_CTX, | |
4906 | .arg2_type = ARG_PTR_TO_MEM, | |
4907 | .arg3_type = ARG_CONST_SIZE, | |
4908 | .arg4_type = ARG_ANYTHING, | |
4909 | }; | |
4910 | ||
fe94cc29 MX |
4911 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
4912 | static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) | |
4913 | { | |
4914 | int err; | |
4915 | struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; | |
4916 | ||
4917 | if (!seg6_validate_srh(srh, len)) | |
4918 | return -EINVAL; | |
4919 | ||
4920 | switch (type) { | |
4921 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4922 | if (skb->protocol != htons(ETH_P_IPV6)) | |
4923 | return -EBADMSG; | |
4924 | ||
4925 | err = seg6_do_srh_inline(skb, srh); | |
4926 | break; | |
4927 | case BPF_LWT_ENCAP_SEG6: | |
4928 | skb_reset_inner_headers(skb); | |
4929 | skb->encapsulation = 1; | |
4930 | err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); | |
4931 | break; | |
4932 | default: | |
4933 | return -EINVAL; | |
4934 | } | |
4935 | ||
4936 | bpf_compute_data_pointers(skb); | |
4937 | if (err) | |
4938 | return err; | |
4939 | ||
4940 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
4941 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
4942 | ||
4943 | return seg6_lookup_nexthop(skb, NULL, 0); | |
4944 | } | |
4945 | #endif /* CONFIG_IPV6_SEG6_BPF */ | |
4946 | ||
3e0bd37c PO |
4947 | #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) |
4948 | static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, | |
4949 | bool ingress) | |
4950 | { | |
52f27877 | 4951 | return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); |
3e0bd37c PO |
4952 | } |
4953 | #endif | |
4954 | ||
4955 | BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, | |
fe94cc29 MX |
4956 | u32, len) |
4957 | { | |
4958 | switch (type) { | |
4959 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) | |
4960 | case BPF_LWT_ENCAP_SEG6: | |
4961 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4962 | return bpf_push_seg6_encap(skb, type, hdr, len); | |
3e0bd37c PO |
4963 | #endif |
4964 | #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) | |
4965 | case BPF_LWT_ENCAP_IP: | |
4966 | return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); | |
fe94cc29 MX |
4967 | #endif |
4968 | default: | |
4969 | return -EINVAL; | |
4970 | } | |
4971 | } | |
4972 | ||
3e0bd37c PO |
4973 | BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, |
4974 | void *, hdr, u32, len) | |
4975 | { | |
4976 | switch (type) { | |
4977 | #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) | |
4978 | case BPF_LWT_ENCAP_IP: | |
4979 | return bpf_push_ip_encap(skb, hdr, len, false /* egress */); | |
fe94cc29 MX |
4980 | #endif |
4981 | default: | |
4982 | return -EINVAL; | |
4983 | } | |
4984 | } | |
4985 | ||
3e0bd37c PO |
4986 | static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { |
4987 | .func = bpf_lwt_in_push_encap, | |
4988 | .gpl_only = false, | |
4989 | .ret_type = RET_INTEGER, | |
4990 | .arg1_type = ARG_PTR_TO_CTX, | |
4991 | .arg2_type = ARG_ANYTHING, | |
4992 | .arg3_type = ARG_PTR_TO_MEM, | |
4993 | .arg4_type = ARG_CONST_SIZE | |
4994 | }; | |
4995 | ||
4996 | static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { | |
4997 | .func = bpf_lwt_xmit_push_encap, | |
fe94cc29 MX |
4998 | .gpl_only = false, |
4999 | .ret_type = RET_INTEGER, | |
5000 | .arg1_type = ARG_PTR_TO_CTX, | |
5001 | .arg2_type = ARG_ANYTHING, | |
5002 | .arg3_type = ARG_PTR_TO_MEM, | |
5003 | .arg4_type = ARG_CONST_SIZE | |
5004 | }; | |
5005 | ||
61d76980 | 5006 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
5007 | BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, |
5008 | const void *, from, u32, len) | |
5009 | { | |
fe94cc29 MX |
5010 | struct seg6_bpf_srh_state *srh_state = |
5011 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 5012 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 5013 | void *srh_tlvs, *srh_end, *ptr; |
fe94cc29 MX |
5014 | int srhoff = 0; |
5015 | ||
486cdf21 | 5016 | if (srh == NULL) |
fe94cc29 MX |
5017 | return -EINVAL; |
5018 | ||
fe94cc29 MX |
5019 | srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); |
5020 | srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); | |
5021 | ||
5022 | ptr = skb->data + offset; | |
5023 | if (ptr >= srh_tlvs && ptr + len <= srh_end) | |
486cdf21 | 5024 | srh_state->valid = false; |
fe94cc29 MX |
5025 | else if (ptr < (void *)&srh->flags || |
5026 | ptr + len > (void *)&srh->segments) | |
5027 | return -EFAULT; | |
5028 | ||
5029 | if (unlikely(bpf_try_make_writable(skb, offset + len))) | |
5030 | return -EFAULT; | |
486cdf21 MX |
5031 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
5032 | return -EINVAL; | |
5033 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 MX |
5034 | |
5035 | memcpy(skb->data + offset, from, len); | |
5036 | return 0; | |
fe94cc29 MX |
5037 | } |
5038 | ||
5039 | static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { | |
5040 | .func = bpf_lwt_seg6_store_bytes, | |
5041 | .gpl_only = false, | |
5042 | .ret_type = RET_INTEGER, | |
5043 | .arg1_type = ARG_PTR_TO_CTX, | |
5044 | .arg2_type = ARG_ANYTHING, | |
5045 | .arg3_type = ARG_PTR_TO_MEM, | |
5046 | .arg4_type = ARG_CONST_SIZE | |
5047 | }; | |
5048 | ||
486cdf21 | 5049 | static void bpf_update_srh_state(struct sk_buff *skb) |
fe94cc29 | 5050 | { |
fe94cc29 MX |
5051 | struct seg6_bpf_srh_state *srh_state = |
5052 | this_cpu_ptr(&seg6_bpf_srh_states); | |
fe94cc29 | 5053 | int srhoff = 0; |
fe94cc29 | 5054 | |
486cdf21 MX |
5055 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { |
5056 | srh_state->srh = NULL; | |
5057 | } else { | |
5058 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
5059 | srh_state->hdrlen = srh_state->srh->hdrlen << 3; | |
5060 | srh_state->valid = true; | |
fe94cc29 | 5061 | } |
486cdf21 MX |
5062 | } |
5063 | ||
5064 | BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, | |
5065 | u32, action, void *, param, u32, param_len) | |
5066 | { | |
5067 | struct seg6_bpf_srh_state *srh_state = | |
5068 | this_cpu_ptr(&seg6_bpf_srh_states); | |
5069 | int hdroff = 0; | |
5070 | int err; | |
fe94cc29 MX |
5071 | |
5072 | switch (action) { | |
5073 | case SEG6_LOCAL_ACTION_END_X: | |
486cdf21 MX |
5074 | if (!seg6_bpf_has_valid_srh(skb)) |
5075 | return -EBADMSG; | |
fe94cc29 MX |
5076 | if (param_len != sizeof(struct in6_addr)) |
5077 | return -EINVAL; | |
5078 | return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); | |
5079 | case SEG6_LOCAL_ACTION_END_T: | |
486cdf21 MX |
5080 | if (!seg6_bpf_has_valid_srh(skb)) |
5081 | return -EBADMSG; | |
fe94cc29 MX |
5082 | if (param_len != sizeof(int)) |
5083 | return -EINVAL; | |
5084 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); | |
486cdf21 MX |
5085 | case SEG6_LOCAL_ACTION_END_DT6: |
5086 | if (!seg6_bpf_has_valid_srh(skb)) | |
5087 | return -EBADMSG; | |
fe94cc29 MX |
5088 | if (param_len != sizeof(int)) |
5089 | return -EINVAL; | |
486cdf21 MX |
5090 | |
5091 | if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) | |
5092 | return -EBADMSG; | |
5093 | if (!pskb_pull(skb, hdroff)) | |
5094 | return -EBADMSG; | |
5095 | ||
5096 | skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); | |
5097 | skb_reset_network_header(skb); | |
5098 | skb_reset_transport_header(skb); | |
5099 | skb->encapsulation = 0; | |
5100 | ||
5101 | bpf_compute_data_pointers(skb); | |
5102 | bpf_update_srh_state(skb); | |
fe94cc29 MX |
5103 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); |
5104 | case SEG6_LOCAL_ACTION_END_B6: | |
486cdf21 MX |
5105 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
5106 | return -EBADMSG; | |
fe94cc29 MX |
5107 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, |
5108 | param, param_len); | |
5109 | if (!err) | |
486cdf21 MX |
5110 | bpf_update_srh_state(skb); |
5111 | ||
fe94cc29 MX |
5112 | return err; |
5113 | case SEG6_LOCAL_ACTION_END_B6_ENCAP: | |
486cdf21 MX |
5114 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
5115 | return -EBADMSG; | |
fe94cc29 MX |
5116 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, |
5117 | param, param_len); | |
5118 | if (!err) | |
486cdf21 MX |
5119 | bpf_update_srh_state(skb); |
5120 | ||
fe94cc29 MX |
5121 | return err; |
5122 | default: | |
5123 | return -EINVAL; | |
5124 | } | |
fe94cc29 MX |
5125 | } |
5126 | ||
5127 | static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { | |
5128 | .func = bpf_lwt_seg6_action, | |
5129 | .gpl_only = false, | |
5130 | .ret_type = RET_INTEGER, | |
5131 | .arg1_type = ARG_PTR_TO_CTX, | |
5132 | .arg2_type = ARG_ANYTHING, | |
5133 | .arg3_type = ARG_PTR_TO_MEM, | |
5134 | .arg4_type = ARG_CONST_SIZE | |
5135 | }; | |
5136 | ||
5137 | BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, | |
5138 | s32, len) | |
5139 | { | |
fe94cc29 MX |
5140 | struct seg6_bpf_srh_state *srh_state = |
5141 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 5142 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 5143 | void *srh_end, *srh_tlvs, *ptr; |
fe94cc29 MX |
5144 | struct ipv6hdr *hdr; |
5145 | int srhoff = 0; | |
5146 | int ret; | |
5147 | ||
486cdf21 | 5148 | if (unlikely(srh == NULL)) |
fe94cc29 | 5149 | return -EINVAL; |
fe94cc29 MX |
5150 | |
5151 | srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + | |
5152 | ((srh->first_segment + 1) << 4)); | |
5153 | srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + | |
5154 | srh_state->hdrlen); | |
5155 | ptr = skb->data + offset; | |
5156 | ||
5157 | if (unlikely(ptr < srh_tlvs || ptr > srh_end)) | |
5158 | return -EFAULT; | |
5159 | if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) | |
5160 | return -EFAULT; | |
5161 | ||
5162 | if (len > 0) { | |
5163 | ret = skb_cow_head(skb, len); | |
5164 | if (unlikely(ret < 0)) | |
5165 | return ret; | |
5166 | ||
5167 | ret = bpf_skb_net_hdr_push(skb, offset, len); | |
5168 | } else { | |
5169 | ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); | |
5170 | } | |
5171 | ||
5172 | bpf_compute_data_pointers(skb); | |
5173 | if (unlikely(ret < 0)) | |
5174 | return ret; | |
5175 | ||
5176 | hdr = (struct ipv6hdr *)skb->data; | |
5177 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
5178 | ||
486cdf21 MX |
5179 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
5180 | return -EINVAL; | |
5181 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 | 5182 | srh_state->hdrlen += len; |
486cdf21 | 5183 | srh_state->valid = false; |
fe94cc29 | 5184 | return 0; |
fe94cc29 MX |
5185 | } |
5186 | ||
5187 | static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { | |
5188 | .func = bpf_lwt_seg6_adjust_srh, | |
5189 | .gpl_only = false, | |
5190 | .ret_type = RET_INTEGER, | |
5191 | .arg1_type = ARG_PTR_TO_CTX, | |
5192 | .arg2_type = ARG_ANYTHING, | |
5193 | .arg3_type = ARG_ANYTHING, | |
5194 | }; | |
61d76980 | 5195 | #endif /* CONFIG_IPV6_SEG6_BPF */ |
fe94cc29 | 5196 | |
df3f94a0 AB |
5197 | #ifdef CONFIG_INET |
5198 | static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, | |
c8123ead | 5199 | int dif, int sdif, u8 family, u8 proto) |
6acc9b43 | 5200 | { |
6acc9b43 JS |
5201 | bool refcounted = false; |
5202 | struct sock *sk = NULL; | |
5203 | ||
5204 | if (family == AF_INET) { | |
5205 | __be32 src4 = tuple->ipv4.saddr; | |
5206 | __be32 dst4 = tuple->ipv4.daddr; | |
6acc9b43 JS |
5207 | |
5208 | if (proto == IPPROTO_TCP) | |
c8123ead | 5209 | sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, |
6acc9b43 JS |
5210 | src4, tuple->ipv4.sport, |
5211 | dst4, tuple->ipv4.dport, | |
5212 | dif, sdif, &refcounted); | |
5213 | else | |
5214 | sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, | |
5215 | dst4, tuple->ipv4.dport, | |
c8123ead | 5216 | dif, sdif, &udp_table, NULL); |
8a615c6b | 5217 | #if IS_ENABLED(CONFIG_IPV6) |
6acc9b43 JS |
5218 | } else { |
5219 | struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; | |
5220 | struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; | |
6acc9b43 JS |
5221 | |
5222 | if (proto == IPPROTO_TCP) | |
c8123ead | 5223 | sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, |
6acc9b43 | 5224 | src6, tuple->ipv6.sport, |
cac6cc2f | 5225 | dst6, ntohs(tuple->ipv6.dport), |
6acc9b43 | 5226 | dif, sdif, &refcounted); |
8a615c6b JS |
5227 | else if (likely(ipv6_bpf_stub)) |
5228 | sk = ipv6_bpf_stub->udp6_lib_lookup(net, | |
5229 | src6, tuple->ipv6.sport, | |
cac6cc2f | 5230 | dst6, tuple->ipv6.dport, |
8a615c6b | 5231 | dif, sdif, |
c8123ead | 5232 | &udp_table, NULL); |
6acc9b43 JS |
5233 | #endif |
5234 | } | |
5235 | ||
5236 | if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { | |
5237 | WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); | |
5238 | sk = NULL; | |
5239 | } | |
5240 | return sk; | |
5241 | } | |
5242 | ||
edbf8c01 | 5243 | /* bpf_skc_lookup performs the core lookup for different types of sockets, |
6acc9b43 JS |
5244 | * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. |
5245 | * Returns the socket as an 'unsigned long' to simplify the casting in the | |
5246 | * callers to satisfy BPF_CALL declarations. | |
5247 | */ | |
edbf8c01 LB |
5248 | static struct sock * |
5249 | __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, | |
5250 | struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, | |
5251 | u64 flags) | |
6acc9b43 | 5252 | { |
6acc9b43 JS |
5253 | struct sock *sk = NULL; |
5254 | u8 family = AF_UNSPEC; | |
5255 | struct net *net; | |
c8123ead | 5256 | int sdif; |
6acc9b43 | 5257 | |
9b28ae24 LB |
5258 | if (len == sizeof(tuple->ipv4)) |
5259 | family = AF_INET; | |
5260 | else if (len == sizeof(tuple->ipv6)) | |
5261 | family = AF_INET6; | |
5262 | else | |
5263 | return NULL; | |
5264 | ||
f71c6143 JS |
5265 | if (unlikely(family == AF_UNSPEC || flags || |
5266 | !((s32)netns_id < 0 || netns_id <= S32_MAX))) | |
6acc9b43 JS |
5267 | goto out; |
5268 | ||
c8123ead NH |
5269 | if (family == AF_INET) |
5270 | sdif = inet_sdif(skb); | |
6acc9b43 | 5271 | else |
c8123ead NH |
5272 | sdif = inet6_sdif(skb); |
5273 | ||
f71c6143 JS |
5274 | if ((s32)netns_id < 0) { |
5275 | net = caller_net; | |
4cc1feeb | 5276 | sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
f71c6143 | 5277 | } else { |
6acc9b43 JS |
5278 | net = get_net_ns_by_id(caller_net, netns_id); |
5279 | if (unlikely(!net)) | |
5280 | goto out; | |
c8123ead | 5281 | sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
6acc9b43 | 5282 | put_net(net); |
6acc9b43 JS |
5283 | } |
5284 | ||
edbf8c01 LB |
5285 | out: |
5286 | return sk; | |
5287 | } | |
5288 | ||
5289 | static struct sock * | |
5290 | __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, | |
5291 | struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, | |
5292 | u64 flags) | |
5293 | { | |
5294 | struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, | |
5295 | ifindex, proto, netns_id, flags); | |
5296 | ||
f7355a6c | 5297 | if (sk) { |
6acc9b43 | 5298 | sk = sk_to_full_sk(sk); |
f7355a6c | 5299 | if (!sk_fullsock(sk)) { |
2e012c74 | 5300 | sock_gen_put(sk); |
f7355a6c MKL |
5301 | return NULL; |
5302 | } | |
5303 | } | |
edbf8c01 LB |
5304 | |
5305 | return sk; | |
6acc9b43 JS |
5306 | } |
5307 | ||
edbf8c01 LB |
5308 | static struct sock * |
5309 | bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, | |
5310 | u8 proto, u64 netns_id, u64 flags) | |
c8123ead NH |
5311 | { |
5312 | struct net *caller_net; | |
5313 | int ifindex; | |
5314 | ||
5315 | if (skb->dev) { | |
5316 | caller_net = dev_net(skb->dev); | |
5317 | ifindex = skb->dev->ifindex; | |
5318 | } else { | |
5319 | caller_net = sock_net(skb->sk); | |
5320 | ifindex = 0; | |
5321 | } | |
5322 | ||
edbf8c01 LB |
5323 | return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, |
5324 | netns_id, flags); | |
c8123ead NH |
5325 | } |
5326 | ||
edbf8c01 LB |
5327 | static struct sock * |
5328 | bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, | |
5329 | u8 proto, u64 netns_id, u64 flags) | |
5330 | { | |
5331 | struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, | |
5332 | flags); | |
5333 | ||
f7355a6c | 5334 | if (sk) { |
edbf8c01 | 5335 | sk = sk_to_full_sk(sk); |
f7355a6c | 5336 | if (!sk_fullsock(sk)) { |
2e012c74 | 5337 | sock_gen_put(sk); |
f7355a6c MKL |
5338 | return NULL; |
5339 | } | |
5340 | } | |
edbf8c01 LB |
5341 | |
5342 | return sk; | |
5343 | } | |
5344 | ||
5345 | BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, | |
5346 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5347 | { | |
5348 | return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, | |
5349 | netns_id, flags); | |
5350 | } | |
5351 | ||
5352 | static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { | |
5353 | .func = bpf_skc_lookup_tcp, | |
5354 | .gpl_only = false, | |
5355 | .pkt_access = true, | |
5356 | .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, | |
5357 | .arg1_type = ARG_PTR_TO_CTX, | |
5358 | .arg2_type = ARG_PTR_TO_MEM, | |
5359 | .arg3_type = ARG_CONST_SIZE, | |
5360 | .arg4_type = ARG_ANYTHING, | |
5361 | .arg5_type = ARG_ANYTHING, | |
5362 | }; | |
5363 | ||
6acc9b43 JS |
5364 | BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, |
5365 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5366 | { | |
edbf8c01 LB |
5367 | return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, |
5368 | netns_id, flags); | |
6acc9b43 JS |
5369 | } |
5370 | ||
5371 | static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { | |
5372 | .func = bpf_sk_lookup_tcp, | |
5373 | .gpl_only = false, | |
5374 | .pkt_access = true, | |
5375 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5376 | .arg1_type = ARG_PTR_TO_CTX, | |
5377 | .arg2_type = ARG_PTR_TO_MEM, | |
5378 | .arg3_type = ARG_CONST_SIZE, | |
5379 | .arg4_type = ARG_ANYTHING, | |
5380 | .arg5_type = ARG_ANYTHING, | |
5381 | }; | |
5382 | ||
5383 | BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, | |
5384 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5385 | { | |
edbf8c01 LB |
5386 | return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, |
5387 | netns_id, flags); | |
6acc9b43 JS |
5388 | } |
5389 | ||
5390 | static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { | |
5391 | .func = bpf_sk_lookup_udp, | |
5392 | .gpl_only = false, | |
5393 | .pkt_access = true, | |
5394 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5395 | .arg1_type = ARG_PTR_TO_CTX, | |
5396 | .arg2_type = ARG_PTR_TO_MEM, | |
5397 | .arg3_type = ARG_CONST_SIZE, | |
5398 | .arg4_type = ARG_ANYTHING, | |
5399 | .arg5_type = ARG_ANYTHING, | |
5400 | }; | |
5401 | ||
5402 | BPF_CALL_1(bpf_sk_release, struct sock *, sk) | |
5403 | { | |
7ae215d2 | 5404 | if (sk_is_refcounted(sk)) |
6acc9b43 JS |
5405 | sock_gen_put(sk); |
5406 | return 0; | |
5407 | } | |
5408 | ||
5409 | static const struct bpf_func_proto bpf_sk_release_proto = { | |
5410 | .func = bpf_sk_release, | |
5411 | .gpl_only = false, | |
5412 | .ret_type = RET_INTEGER, | |
1b986589 | 5413 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
6acc9b43 | 5414 | }; |
c8123ead NH |
5415 | |
5416 | BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, | |
5417 | struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) | |
5418 | { | |
5419 | struct net *caller_net = dev_net(ctx->rxq->dev); | |
5420 | int ifindex = ctx->rxq->dev->ifindex; | |
5421 | ||
edbf8c01 LB |
5422 | return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, |
5423 | ifindex, IPPROTO_UDP, netns_id, | |
5424 | flags); | |
c8123ead NH |
5425 | } |
5426 | ||
5427 | static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { | |
5428 | .func = bpf_xdp_sk_lookup_udp, | |
5429 | .gpl_only = false, | |
5430 | .pkt_access = true, | |
5431 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5432 | .arg1_type = ARG_PTR_TO_CTX, | |
5433 | .arg2_type = ARG_PTR_TO_MEM, | |
5434 | .arg3_type = ARG_CONST_SIZE, | |
5435 | .arg4_type = ARG_ANYTHING, | |
5436 | .arg5_type = ARG_ANYTHING, | |
5437 | }; | |
5438 | ||
edbf8c01 LB |
5439 | BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, |
5440 | struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) | |
5441 | { | |
5442 | struct net *caller_net = dev_net(ctx->rxq->dev); | |
5443 | int ifindex = ctx->rxq->dev->ifindex; | |
5444 | ||
5445 | return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, | |
5446 | ifindex, IPPROTO_TCP, netns_id, | |
5447 | flags); | |
5448 | } | |
5449 | ||
5450 | static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { | |
5451 | .func = bpf_xdp_skc_lookup_tcp, | |
5452 | .gpl_only = false, | |
5453 | .pkt_access = true, | |
5454 | .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, | |
5455 | .arg1_type = ARG_PTR_TO_CTX, | |
5456 | .arg2_type = ARG_PTR_TO_MEM, | |
5457 | .arg3_type = ARG_CONST_SIZE, | |
5458 | .arg4_type = ARG_ANYTHING, | |
5459 | .arg5_type = ARG_ANYTHING, | |
5460 | }; | |
5461 | ||
c8123ead NH |
5462 | BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, |
5463 | struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) | |
5464 | { | |
5465 | struct net *caller_net = dev_net(ctx->rxq->dev); | |
5466 | int ifindex = ctx->rxq->dev->ifindex; | |
5467 | ||
edbf8c01 LB |
5468 | return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, |
5469 | ifindex, IPPROTO_TCP, netns_id, | |
5470 | flags); | |
c8123ead NH |
5471 | } |
5472 | ||
5473 | static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { | |
5474 | .func = bpf_xdp_sk_lookup_tcp, | |
5475 | .gpl_only = false, | |
5476 | .pkt_access = true, | |
5477 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5478 | .arg1_type = ARG_PTR_TO_CTX, | |
5479 | .arg2_type = ARG_PTR_TO_MEM, | |
5480 | .arg3_type = ARG_CONST_SIZE, | |
5481 | .arg4_type = ARG_ANYTHING, | |
5482 | .arg5_type = ARG_ANYTHING, | |
5483 | }; | |
6c49e65e | 5484 | |
edbf8c01 LB |
5485 | BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, |
5486 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5487 | { | |
5488 | return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, | |
5489 | sock_net(ctx->sk), 0, | |
5490 | IPPROTO_TCP, netns_id, flags); | |
5491 | } | |
5492 | ||
5493 | static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { | |
5494 | .func = bpf_sock_addr_skc_lookup_tcp, | |
5495 | .gpl_only = false, | |
5496 | .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, | |
5497 | .arg1_type = ARG_PTR_TO_CTX, | |
5498 | .arg2_type = ARG_PTR_TO_MEM, | |
5499 | .arg3_type = ARG_CONST_SIZE, | |
5500 | .arg4_type = ARG_ANYTHING, | |
5501 | .arg5_type = ARG_ANYTHING, | |
5502 | }; | |
5503 | ||
6c49e65e AI |
5504 | BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, |
5505 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5506 | { | |
edbf8c01 LB |
5507 | return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, |
5508 | sock_net(ctx->sk), 0, IPPROTO_TCP, | |
5509 | netns_id, flags); | |
6c49e65e AI |
5510 | } |
5511 | ||
5512 | static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { | |
5513 | .func = bpf_sock_addr_sk_lookup_tcp, | |
5514 | .gpl_only = false, | |
5515 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5516 | .arg1_type = ARG_PTR_TO_CTX, | |
5517 | .arg2_type = ARG_PTR_TO_MEM, | |
5518 | .arg3_type = ARG_CONST_SIZE, | |
5519 | .arg4_type = ARG_ANYTHING, | |
5520 | .arg5_type = ARG_ANYTHING, | |
5521 | }; | |
5522 | ||
5523 | BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, | |
5524 | struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) | |
5525 | { | |
edbf8c01 LB |
5526 | return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, |
5527 | sock_net(ctx->sk), 0, IPPROTO_UDP, | |
5528 | netns_id, flags); | |
6c49e65e AI |
5529 | } |
5530 | ||
5531 | static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { | |
5532 | .func = bpf_sock_addr_sk_lookup_udp, | |
5533 | .gpl_only = false, | |
5534 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5535 | .arg1_type = ARG_PTR_TO_CTX, | |
5536 | .arg2_type = ARG_PTR_TO_MEM, | |
5537 | .arg3_type = ARG_CONST_SIZE, | |
5538 | .arg4_type = ARG_ANYTHING, | |
5539 | .arg5_type = ARG_ANYTHING, | |
5540 | }; | |
5541 | ||
655a51e5 MKL |
5542 | bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
5543 | struct bpf_insn_access_aux *info) | |
5544 | { | |
c2cb5e82 SF |
5545 | if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, |
5546 | icsk_retransmits)) | |
655a51e5 MKL |
5547 | return false; |
5548 | ||
5549 | if (off % size != 0) | |
5550 | return false; | |
5551 | ||
5552 | switch (off) { | |
5553 | case offsetof(struct bpf_tcp_sock, bytes_received): | |
5554 | case offsetof(struct bpf_tcp_sock, bytes_acked): | |
5555 | return size == sizeof(__u64); | |
5556 | default: | |
5557 | return size == sizeof(__u32); | |
5558 | } | |
5559 | } | |
5560 | ||
5561 | u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, | |
5562 | const struct bpf_insn *si, | |
5563 | struct bpf_insn *insn_buf, | |
5564 | struct bpf_prog *prog, u32 *target_size) | |
5565 | { | |
5566 | struct bpf_insn *insn = insn_buf; | |
5567 | ||
5568 | #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ | |
5569 | do { \ | |
c593642c PB |
5570 | BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ |
5571 | sizeof_field(struct bpf_tcp_sock, FIELD)); \ | |
655a51e5 MKL |
5572 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ |
5573 | si->dst_reg, si->src_reg, \ | |
5574 | offsetof(struct tcp_sock, FIELD)); \ | |
5575 | } while (0) | |
5576 | ||
c2cb5e82 SF |
5577 | #define BPF_INET_SOCK_GET_COMMON(FIELD) \ |
5578 | do { \ | |
c593642c | 5579 | BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ |
c2cb5e82 | 5580 | FIELD) > \ |
c593642c | 5581 | sizeof_field(struct bpf_tcp_sock, FIELD)); \ |
c2cb5e82 SF |
5582 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
5583 | struct inet_connection_sock, \ | |
5584 | FIELD), \ | |
5585 | si->dst_reg, si->src_reg, \ | |
5586 | offsetof( \ | |
5587 | struct inet_connection_sock, \ | |
5588 | FIELD)); \ | |
5589 | } while (0) | |
5590 | ||
655a51e5 MKL |
5591 | if (insn > insn_buf) |
5592 | return insn - insn_buf; | |
5593 | ||
5594 | switch (si->off) { | |
5595 | case offsetof(struct bpf_tcp_sock, rtt_min): | |
c593642c | 5596 | BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != |
655a51e5 MKL |
5597 | sizeof(struct minmax)); |
5598 | BUILD_BUG_ON(sizeof(struct minmax) < | |
5599 | sizeof(struct minmax_sample)); | |
5600 | ||
5601 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
5602 | offsetof(struct tcp_sock, rtt_min) + | |
5603 | offsetof(struct minmax_sample, v)); | |
5604 | break; | |
2377b81d SF |
5605 | case offsetof(struct bpf_tcp_sock, snd_cwnd): |
5606 | BPF_TCP_SOCK_GET_COMMON(snd_cwnd); | |
5607 | break; | |
5608 | case offsetof(struct bpf_tcp_sock, srtt_us): | |
5609 | BPF_TCP_SOCK_GET_COMMON(srtt_us); | |
5610 | break; | |
5611 | case offsetof(struct bpf_tcp_sock, snd_ssthresh): | |
5612 | BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); | |
5613 | break; | |
5614 | case offsetof(struct bpf_tcp_sock, rcv_nxt): | |
5615 | BPF_TCP_SOCK_GET_COMMON(rcv_nxt); | |
5616 | break; | |
5617 | case offsetof(struct bpf_tcp_sock, snd_nxt): | |
5618 | BPF_TCP_SOCK_GET_COMMON(snd_nxt); | |
5619 | break; | |
5620 | case offsetof(struct bpf_tcp_sock, snd_una): | |
5621 | BPF_TCP_SOCK_GET_COMMON(snd_una); | |
5622 | break; | |
5623 | case offsetof(struct bpf_tcp_sock, mss_cache): | |
5624 | BPF_TCP_SOCK_GET_COMMON(mss_cache); | |
5625 | break; | |
5626 | case offsetof(struct bpf_tcp_sock, ecn_flags): | |
5627 | BPF_TCP_SOCK_GET_COMMON(ecn_flags); | |
5628 | break; | |
5629 | case offsetof(struct bpf_tcp_sock, rate_delivered): | |
5630 | BPF_TCP_SOCK_GET_COMMON(rate_delivered); | |
5631 | break; | |
5632 | case offsetof(struct bpf_tcp_sock, rate_interval_us): | |
5633 | BPF_TCP_SOCK_GET_COMMON(rate_interval_us); | |
5634 | break; | |
5635 | case offsetof(struct bpf_tcp_sock, packets_out): | |
5636 | BPF_TCP_SOCK_GET_COMMON(packets_out); | |
5637 | break; | |
5638 | case offsetof(struct bpf_tcp_sock, retrans_out): | |
5639 | BPF_TCP_SOCK_GET_COMMON(retrans_out); | |
5640 | break; | |
5641 | case offsetof(struct bpf_tcp_sock, total_retrans): | |
5642 | BPF_TCP_SOCK_GET_COMMON(total_retrans); | |
5643 | break; | |
5644 | case offsetof(struct bpf_tcp_sock, segs_in): | |
5645 | BPF_TCP_SOCK_GET_COMMON(segs_in); | |
5646 | break; | |
5647 | case offsetof(struct bpf_tcp_sock, data_segs_in): | |
5648 | BPF_TCP_SOCK_GET_COMMON(data_segs_in); | |
5649 | break; | |
5650 | case offsetof(struct bpf_tcp_sock, segs_out): | |
5651 | BPF_TCP_SOCK_GET_COMMON(segs_out); | |
5652 | break; | |
5653 | case offsetof(struct bpf_tcp_sock, data_segs_out): | |
5654 | BPF_TCP_SOCK_GET_COMMON(data_segs_out); | |
5655 | break; | |
5656 | case offsetof(struct bpf_tcp_sock, lost_out): | |
5657 | BPF_TCP_SOCK_GET_COMMON(lost_out); | |
5658 | break; | |
5659 | case offsetof(struct bpf_tcp_sock, sacked_out): | |
5660 | BPF_TCP_SOCK_GET_COMMON(sacked_out); | |
5661 | break; | |
5662 | case offsetof(struct bpf_tcp_sock, bytes_received): | |
5663 | BPF_TCP_SOCK_GET_COMMON(bytes_received); | |
5664 | break; | |
5665 | case offsetof(struct bpf_tcp_sock, bytes_acked): | |
5666 | BPF_TCP_SOCK_GET_COMMON(bytes_acked); | |
5667 | break; | |
0357746d SF |
5668 | case offsetof(struct bpf_tcp_sock, dsack_dups): |
5669 | BPF_TCP_SOCK_GET_COMMON(dsack_dups); | |
5670 | break; | |
5671 | case offsetof(struct bpf_tcp_sock, delivered): | |
5672 | BPF_TCP_SOCK_GET_COMMON(delivered); | |
5673 | break; | |
5674 | case offsetof(struct bpf_tcp_sock, delivered_ce): | |
5675 | BPF_TCP_SOCK_GET_COMMON(delivered_ce); | |
5676 | break; | |
c2cb5e82 SF |
5677 | case offsetof(struct bpf_tcp_sock, icsk_retransmits): |
5678 | BPF_INET_SOCK_GET_COMMON(icsk_retransmits); | |
5679 | break; | |
655a51e5 MKL |
5680 | } |
5681 | ||
5682 | return insn - insn_buf; | |
5683 | } | |
5684 | ||
5685 | BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) | |
5686 | { | |
655a51e5 MKL |
5687 | if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) |
5688 | return (unsigned long)sk; | |
5689 | ||
5690 | return (unsigned long)NULL; | |
5691 | } | |
5692 | ||
0d01da6a | 5693 | const struct bpf_func_proto bpf_tcp_sock_proto = { |
655a51e5 MKL |
5694 | .func = bpf_tcp_sock, |
5695 | .gpl_only = false, | |
5696 | .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, | |
5697 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, | |
5698 | }; | |
5699 | ||
dbafd7dd MKL |
5700 | BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) |
5701 | { | |
5702 | sk = sk_to_full_sk(sk); | |
5703 | ||
5704 | if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) | |
5705 | return (unsigned long)sk; | |
5706 | ||
5707 | return (unsigned long)NULL; | |
5708 | } | |
5709 | ||
5710 | static const struct bpf_func_proto bpf_get_listener_sock_proto = { | |
5711 | .func = bpf_get_listener_sock, | |
5712 | .gpl_only = false, | |
5713 | .ret_type = RET_PTR_TO_SOCKET_OR_NULL, | |
5714 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, | |
5715 | }; | |
5716 | ||
f7c917ba | 5717 | BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) |
5718 | { | |
5719 | unsigned int iphdr_len; | |
5720 | ||
5721 | if (skb->protocol == cpu_to_be16(ETH_P_IP)) | |
5722 | iphdr_len = sizeof(struct iphdr); | |
5723 | else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) | |
5724 | iphdr_len = sizeof(struct ipv6hdr); | |
5725 | else | |
5726 | return 0; | |
5727 | ||
5728 | if (skb_headlen(skb) < iphdr_len) | |
5729 | return 0; | |
5730 | ||
5731 | if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) | |
5732 | return 0; | |
5733 | ||
5734 | return INET_ECN_set_ce(skb); | |
5735 | } | |
5736 | ||
fada7fdc JL |
5737 | bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
5738 | struct bpf_insn_access_aux *info) | |
5739 | { | |
5740 | if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) | |
5741 | return false; | |
5742 | ||
5743 | if (off % size != 0) | |
5744 | return false; | |
5745 | ||
5746 | switch (off) { | |
5747 | default: | |
5748 | return size == sizeof(__u32); | |
5749 | } | |
5750 | } | |
5751 | ||
5752 | u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, | |
5753 | const struct bpf_insn *si, | |
5754 | struct bpf_insn *insn_buf, | |
5755 | struct bpf_prog *prog, u32 *target_size) | |
5756 | { | |
5757 | struct bpf_insn *insn = insn_buf; | |
5758 | ||
5759 | #define BPF_XDP_SOCK_GET(FIELD) \ | |
5760 | do { \ | |
c593642c PB |
5761 | BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ |
5762 | sizeof_field(struct bpf_xdp_sock, FIELD)); \ | |
fada7fdc JL |
5763 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ |
5764 | si->dst_reg, si->src_reg, \ | |
5765 | offsetof(struct xdp_sock, FIELD)); \ | |
5766 | } while (0) | |
5767 | ||
5768 | switch (si->off) { | |
5769 | case offsetof(struct bpf_xdp_sock, queue_id): | |
5770 | BPF_XDP_SOCK_GET(queue_id); | |
5771 | break; | |
5772 | } | |
5773 | ||
5774 | return insn - insn_buf; | |
5775 | } | |
5776 | ||
f7c917ba | 5777 | static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { |
5778 | .func = bpf_skb_ecn_set_ce, | |
5779 | .gpl_only = false, | |
5780 | .ret_type = RET_INTEGER, | |
5781 | .arg1_type = ARG_PTR_TO_CTX, | |
5782 | }; | |
39904084 LB |
5783 | |
5784 | BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, | |
5785 | struct tcphdr *, th, u32, th_len) | |
5786 | { | |
5787 | #ifdef CONFIG_SYN_COOKIES | |
5788 | u32 cookie; | |
5789 | int ret; | |
5790 | ||
5791 | if (unlikely(th_len < sizeof(*th))) | |
5792 | return -EINVAL; | |
5793 | ||
5794 | /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ | |
5795 | if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) | |
5796 | return -EINVAL; | |
5797 | ||
5798 | if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) | |
5799 | return -EINVAL; | |
5800 | ||
5801 | if (!th->ack || th->rst || th->syn) | |
5802 | return -ENOENT; | |
5803 | ||
5804 | if (tcp_synq_no_recent_overflow(sk)) | |
5805 | return -ENOENT; | |
5806 | ||
5807 | cookie = ntohl(th->ack_seq) - 1; | |
5808 | ||
5809 | switch (sk->sk_family) { | |
5810 | case AF_INET: | |
5811 | if (unlikely(iph_len < sizeof(struct iphdr))) | |
5812 | return -EINVAL; | |
5813 | ||
5814 | ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); | |
5815 | break; | |
5816 | ||
5817 | #if IS_BUILTIN(CONFIG_IPV6) | |
5818 | case AF_INET6: | |
5819 | if (unlikely(iph_len < sizeof(struct ipv6hdr))) | |
5820 | return -EINVAL; | |
5821 | ||
5822 | ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); | |
5823 | break; | |
5824 | #endif /* CONFIG_IPV6 */ | |
5825 | ||
5826 | default: | |
5827 | return -EPROTONOSUPPORT; | |
5828 | } | |
5829 | ||
5830 | if (ret > 0) | |
5831 | return 0; | |
5832 | ||
5833 | return -ENOENT; | |
5834 | #else | |
5835 | return -ENOTSUPP; | |
5836 | #endif | |
5837 | } | |
5838 | ||
5839 | static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { | |
5840 | .func = bpf_tcp_check_syncookie, | |
5841 | .gpl_only = true, | |
5842 | .pkt_access = true, | |
5843 | .ret_type = RET_INTEGER, | |
5844 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, | |
5845 | .arg2_type = ARG_PTR_TO_MEM, | |
5846 | .arg3_type = ARG_CONST_SIZE, | |
5847 | .arg4_type = ARG_PTR_TO_MEM, | |
5848 | .arg5_type = ARG_CONST_SIZE, | |
5849 | }; | |
5850 | ||
70d66244 PP |
5851 | BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, |
5852 | struct tcphdr *, th, u32, th_len) | |
5853 | { | |
5854 | #ifdef CONFIG_SYN_COOKIES | |
5855 | u32 cookie; | |
5856 | u16 mss; | |
5857 | ||
5858 | if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) | |
5859 | return -EINVAL; | |
5860 | ||
5861 | if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) | |
5862 | return -EINVAL; | |
5863 | ||
5864 | if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) | |
5865 | return -ENOENT; | |
5866 | ||
5867 | if (!th->syn || th->ack || th->fin || th->rst) | |
5868 | return -EINVAL; | |
5869 | ||
5870 | if (unlikely(iph_len < sizeof(struct iphdr))) | |
5871 | return -EINVAL; | |
5872 | ||
5873 | /* Both struct iphdr and struct ipv6hdr have the version field at the | |
5874 | * same offset so we can cast to the shorter header (struct iphdr). | |
5875 | */ | |
5876 | switch (((struct iphdr *)iph)->version) { | |
5877 | case 4: | |
5878 | if (sk->sk_family == AF_INET6 && sk->sk_ipv6only) | |
5879 | return -EINVAL; | |
5880 | ||
5881 | mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); | |
5882 | break; | |
5883 | ||
5884 | #if IS_BUILTIN(CONFIG_IPV6) | |
5885 | case 6: | |
5886 | if (unlikely(iph_len < sizeof(struct ipv6hdr))) | |
5887 | return -EINVAL; | |
5888 | ||
5889 | if (sk->sk_family != AF_INET6) | |
5890 | return -EINVAL; | |
5891 | ||
5892 | mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); | |
5893 | break; | |
5894 | #endif /* CONFIG_IPV6 */ | |
5895 | ||
5896 | default: | |
5897 | return -EPROTONOSUPPORT; | |
5898 | } | |
0741be35 | 5899 | if (mss == 0) |
70d66244 PP |
5900 | return -ENOENT; |
5901 | ||
5902 | return cookie | ((u64)mss << 32); | |
5903 | #else | |
5904 | return -EOPNOTSUPP; | |
5905 | #endif /* CONFIG_SYN_COOKIES */ | |
5906 | } | |
5907 | ||
5908 | static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { | |
5909 | .func = bpf_tcp_gen_syncookie, | |
5910 | .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ | |
5911 | .pkt_access = true, | |
5912 | .ret_type = RET_INTEGER, | |
5913 | .arg1_type = ARG_PTR_TO_SOCK_COMMON, | |
5914 | .arg2_type = ARG_PTR_TO_MEM, | |
5915 | .arg3_type = ARG_CONST_SIZE, | |
5916 | .arg4_type = ARG_PTR_TO_MEM, | |
5917 | .arg5_type = ARG_CONST_SIZE, | |
5918 | }; | |
5919 | ||
cf7fbe66 JS |
5920 | BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) |
5921 | { | |
5922 | if (flags != 0) | |
5923 | return -EINVAL; | |
5924 | if (!skb_at_tc_ingress(skb)) | |
5925 | return -EOPNOTSUPP; | |
5926 | if (unlikely(dev_net(skb->dev) != sock_net(sk))) | |
5927 | return -ENETUNREACH; | |
8e368dc7 | 5928 | if (unlikely(sk_fullsock(sk) && sk->sk_reuseport)) |
cf7fbe66 | 5929 | return -ESOCKTNOSUPPORT; |
7ae215d2 JS |
5930 | if (sk_is_refcounted(sk) && |
5931 | unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) | |
cf7fbe66 JS |
5932 | return -ENOENT; |
5933 | ||
5934 | skb_orphan(skb); | |
5935 | skb->sk = sk; | |
5936 | skb->destructor = sock_pfree; | |
5937 | ||
5938 | return 0; | |
5939 | } | |
5940 | ||
5941 | static const struct bpf_func_proto bpf_sk_assign_proto = { | |
5942 | .func = bpf_sk_assign, | |
5943 | .gpl_only = false, | |
5944 | .ret_type = RET_INTEGER, | |
5945 | .arg1_type = ARG_PTR_TO_CTX, | |
5946 | .arg2_type = ARG_PTR_TO_SOCK_COMMON, | |
5947 | .arg3_type = ARG_ANYTHING, | |
5948 | }; | |
5949 | ||
df3f94a0 | 5950 | #endif /* CONFIG_INET */ |
6acc9b43 | 5951 | |
fe94cc29 MX |
5952 | bool bpf_helper_changes_pkt_data(void *func) |
5953 | { | |
5954 | if (func == bpf_skb_vlan_push || | |
5955 | func == bpf_skb_vlan_pop || | |
5956 | func == bpf_skb_store_bytes || | |
5957 | func == bpf_skb_change_proto || | |
5958 | func == bpf_skb_change_head || | |
0ea488ff | 5959 | func == sk_skb_change_head || |
fe94cc29 | 5960 | func == bpf_skb_change_tail || |
0ea488ff | 5961 | func == sk_skb_change_tail || |
fe94cc29 MX |
5962 | func == bpf_skb_adjust_room || |
5963 | func == bpf_skb_pull_data || | |
0ea488ff | 5964 | func == sk_skb_pull_data || |
fe94cc29 MX |
5965 | func == bpf_clone_redirect || |
5966 | func == bpf_l3_csum_replace || | |
5967 | func == bpf_l4_csum_replace || | |
5968 | func == bpf_xdp_adjust_head || | |
5969 | func == bpf_xdp_adjust_meta || | |
5970 | func == bpf_msg_pull_data || | |
6fff607e | 5971 | func == bpf_msg_push_data || |
7246d8ed | 5972 | func == bpf_msg_pop_data || |
fe94cc29 | 5973 | func == bpf_xdp_adjust_tail || |
61d76980 | 5974 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
5975 | func == bpf_lwt_seg6_store_bytes || |
5976 | func == bpf_lwt_seg6_adjust_srh || | |
61d76980 MX |
5977 | func == bpf_lwt_seg6_action || |
5978 | #endif | |
3e0bd37c PO |
5979 | func == bpf_lwt_in_push_encap || |
5980 | func == bpf_lwt_xmit_push_encap) | |
fe94cc29 MX |
5981 | return true; |
5982 | ||
5983 | return false; | |
5984 | } | |
5985 | ||
0baf26b0 | 5986 | const struct bpf_func_proto * |
2492d3b8 | 5987 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
5988 | { |
5989 | switch (func_id) { | |
5990 | case BPF_FUNC_map_lookup_elem: | |
5991 | return &bpf_map_lookup_elem_proto; | |
5992 | case BPF_FUNC_map_update_elem: | |
5993 | return &bpf_map_update_elem_proto; | |
5994 | case BPF_FUNC_map_delete_elem: | |
5995 | return &bpf_map_delete_elem_proto; | |
f1a2e44a MV |
5996 | case BPF_FUNC_map_push_elem: |
5997 | return &bpf_map_push_elem_proto; | |
5998 | case BPF_FUNC_map_pop_elem: | |
5999 | return &bpf_map_pop_elem_proto; | |
6000 | case BPF_FUNC_map_peek_elem: | |
6001 | return &bpf_map_peek_elem_proto; | |
03e69b50 DB |
6002 | case BPF_FUNC_get_prandom_u32: |
6003 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 6004 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 6005 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
6006 | case BPF_FUNC_get_numa_node_id: |
6007 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
6008 | case BPF_FUNC_tail_call: |
6009 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
6010 | case BPF_FUNC_ktime_get_ns: |
6011 | return &bpf_ktime_get_ns_proto; | |
d83525ca AS |
6012 | default: |
6013 | break; | |
6014 | } | |
6015 | ||
6016 | if (!capable(CAP_SYS_ADMIN)) | |
6017 | return NULL; | |
6018 | ||
6019 | switch (func_id) { | |
6020 | case BPF_FUNC_spin_lock: | |
6021 | return &bpf_spin_lock_proto; | |
6022 | case BPF_FUNC_spin_unlock: | |
6023 | return &bpf_spin_unlock_proto; | |
0756ea3e | 6024 | case BPF_FUNC_trace_printk: |
d83525ca | 6025 | return bpf_get_trace_printk_proto(); |
5576b991 MKL |
6026 | case BPF_FUNC_jiffies64: |
6027 | return &bpf_jiffies64_proto; | |
89aa0758 AS |
6028 | default: |
6029 | return NULL; | |
6030 | } | |
6031 | } | |
6032 | ||
ae2cf1c4 | 6033 | static const struct bpf_func_proto * |
5e43f899 | 6034 | sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
ae2cf1c4 DA |
6035 | { |
6036 | switch (func_id) { | |
6037 | /* inet and inet6 sockets are created in a process | |
6038 | * context so there is always a valid uid/gid | |
6039 | */ | |
6040 | case BPF_FUNC_get_current_uid_gid: | |
6041 | return &bpf_get_current_uid_gid_proto; | |
cd339431 RG |
6042 | case BPF_FUNC_get_local_storage: |
6043 | return &bpf_get_local_storage_proto; | |
0e53d9e5 DB |
6044 | case BPF_FUNC_get_socket_cookie: |
6045 | return &bpf_get_socket_cookie_sock_proto; | |
f318903c DB |
6046 | case BPF_FUNC_get_netns_cookie: |
6047 | return &bpf_get_netns_cookie_sock_proto; | |
fcf752ea DB |
6048 | case BPF_FUNC_perf_event_output: |
6049 | return &bpf_event_output_data_proto; | |
834ebca8 DB |
6050 | case BPF_FUNC_get_current_pid_tgid: |
6051 | return &bpf_get_current_pid_tgid_proto; | |
6052 | case BPF_FUNC_get_current_comm: | |
6053 | return &bpf_get_current_comm_proto; | |
0f09abd1 DB |
6054 | #ifdef CONFIG_CGROUPS |
6055 | case BPF_FUNC_get_current_cgroup_id: | |
6056 | return &bpf_get_current_cgroup_id_proto; | |
6057 | case BPF_FUNC_get_current_ancestor_cgroup_id: | |
6058 | return &bpf_get_current_ancestor_cgroup_id_proto; | |
6059 | #endif | |
5a52ae4e DB |
6060 | #ifdef CONFIG_CGROUP_NET_CLASSID |
6061 | case BPF_FUNC_get_cgroup_classid: | |
6062 | return &bpf_get_cgroup_classid_curr_proto; | |
6063 | #endif | |
ae2cf1c4 DA |
6064 | default: |
6065 | return bpf_base_func_proto(func_id); | |
6066 | } | |
6067 | } | |
6068 | ||
4fbac77d AI |
6069 | static const struct bpf_func_proto * |
6070 | sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6071 | { | |
6072 | switch (func_id) { | |
6073 | /* inet and inet6 sockets are created in a process | |
6074 | * context so there is always a valid uid/gid | |
6075 | */ | |
6076 | case BPF_FUNC_get_current_uid_gid: | |
6077 | return &bpf_get_current_uid_gid_proto; | |
d74bad4e AI |
6078 | case BPF_FUNC_bind: |
6079 | switch (prog->expected_attach_type) { | |
6080 | case BPF_CGROUP_INET4_CONNECT: | |
6081 | case BPF_CGROUP_INET6_CONNECT: | |
6082 | return &bpf_bind_proto; | |
6083 | default: | |
6084 | return NULL; | |
6085 | } | |
d692f113 AI |
6086 | case BPF_FUNC_get_socket_cookie: |
6087 | return &bpf_get_socket_cookie_sock_addr_proto; | |
f318903c DB |
6088 | case BPF_FUNC_get_netns_cookie: |
6089 | return &bpf_get_netns_cookie_sock_addr_proto; | |
cd339431 RG |
6090 | case BPF_FUNC_get_local_storage: |
6091 | return &bpf_get_local_storage_proto; | |
fcf752ea DB |
6092 | case BPF_FUNC_perf_event_output: |
6093 | return &bpf_event_output_data_proto; | |
834ebca8 DB |
6094 | case BPF_FUNC_get_current_pid_tgid: |
6095 | return &bpf_get_current_pid_tgid_proto; | |
6096 | case BPF_FUNC_get_current_comm: | |
6097 | return &bpf_get_current_comm_proto; | |
0f09abd1 DB |
6098 | #ifdef CONFIG_CGROUPS |
6099 | case BPF_FUNC_get_current_cgroup_id: | |
6100 | return &bpf_get_current_cgroup_id_proto; | |
6101 | case BPF_FUNC_get_current_ancestor_cgroup_id: | |
6102 | return &bpf_get_current_ancestor_cgroup_id_proto; | |
6103 | #endif | |
5a52ae4e DB |
6104 | #ifdef CONFIG_CGROUP_NET_CLASSID |
6105 | case BPF_FUNC_get_cgroup_classid: | |
6106 | return &bpf_get_cgroup_classid_curr_proto; | |
6107 | #endif | |
6c49e65e AI |
6108 | #ifdef CONFIG_INET |
6109 | case BPF_FUNC_sk_lookup_tcp: | |
6110 | return &bpf_sock_addr_sk_lookup_tcp_proto; | |
6111 | case BPF_FUNC_sk_lookup_udp: | |
6112 | return &bpf_sock_addr_sk_lookup_udp_proto; | |
6113 | case BPF_FUNC_sk_release: | |
6114 | return &bpf_sk_release_proto; | |
edbf8c01 LB |
6115 | case BPF_FUNC_skc_lookup_tcp: |
6116 | return &bpf_sock_addr_skc_lookup_tcp_proto; | |
6c49e65e | 6117 | #endif /* CONFIG_INET */ |
fb85c4a7 SF |
6118 | case BPF_FUNC_sk_storage_get: |
6119 | return &bpf_sk_storage_get_proto; | |
6120 | case BPF_FUNC_sk_storage_delete: | |
6121 | return &bpf_sk_storage_delete_proto; | |
4fbac77d AI |
6122 | default: |
6123 | return bpf_base_func_proto(func_id); | |
6124 | } | |
6125 | } | |
6126 | ||
2492d3b8 | 6127 | static const struct bpf_func_proto * |
5e43f899 | 6128 | sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2492d3b8 DB |
6129 | { |
6130 | switch (func_id) { | |
6131 | case BPF_FUNC_skb_load_bytes: | |
6132 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
6133 | case BPF_FUNC_skb_load_bytes_relative: |
6134 | return &bpf_skb_load_bytes_relative_proto; | |
91b8270f CF |
6135 | case BPF_FUNC_get_socket_cookie: |
6136 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
6137 | case BPF_FUNC_get_socket_uid: |
6138 | return &bpf_get_socket_uid_proto; | |
7c4b90d7 AZ |
6139 | case BPF_FUNC_perf_event_output: |
6140 | return &bpf_skb_event_output_proto; | |
2492d3b8 DB |
6141 | default: |
6142 | return bpf_base_func_proto(func_id); | |
6143 | } | |
6144 | } | |
6145 | ||
6ac99e8f MKL |
6146 | const struct bpf_func_proto bpf_sk_storage_get_proto __weak; |
6147 | const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; | |
6148 | ||
cd339431 RG |
6149 | static const struct bpf_func_proto * |
6150 | cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6151 | { | |
6152 | switch (func_id) { | |
6153 | case BPF_FUNC_get_local_storage: | |
6154 | return &bpf_get_local_storage_proto; | |
46f8bc92 MKL |
6155 | case BPF_FUNC_sk_fullsock: |
6156 | return &bpf_sk_fullsock_proto; | |
6ac99e8f MKL |
6157 | case BPF_FUNC_sk_storage_get: |
6158 | return &bpf_sk_storage_get_proto; | |
6159 | case BPF_FUNC_sk_storage_delete: | |
6160 | return &bpf_sk_storage_delete_proto; | |
7c4b90d7 AZ |
6161 | case BPF_FUNC_perf_event_output: |
6162 | return &bpf_skb_event_output_proto; | |
4ecabd55 RG |
6163 | #ifdef CONFIG_SOCK_CGROUP_DATA |
6164 | case BPF_FUNC_skb_cgroup_id: | |
6165 | return &bpf_skb_cgroup_id_proto; | |
6166 | #endif | |
655a51e5 MKL |
6167 | #ifdef CONFIG_INET |
6168 | case BPF_FUNC_tcp_sock: | |
6169 | return &bpf_tcp_sock_proto; | |
dbafd7dd MKL |
6170 | case BPF_FUNC_get_listener_sock: |
6171 | return &bpf_get_listener_sock_proto; | |
f7c917ba | 6172 | case BPF_FUNC_skb_ecn_set_ce: |
6173 | return &bpf_skb_ecn_set_ce_proto; | |
655a51e5 | 6174 | #endif |
cd339431 RG |
6175 | default: |
6176 | return sk_filter_func_proto(func_id, prog); | |
6177 | } | |
6178 | } | |
6179 | ||
608cd71a | 6180 | static const struct bpf_func_proto * |
5e43f899 | 6181 | tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
608cd71a AS |
6182 | { |
6183 | switch (func_id) { | |
6184 | case BPF_FUNC_skb_store_bytes: | |
6185 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
6186 | case BPF_FUNC_skb_load_bytes: |
6187 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
6188 | case BPF_FUNC_skb_load_bytes_relative: |
6189 | return &bpf_skb_load_bytes_relative_proto; | |
36bbef52 DB |
6190 | case BPF_FUNC_skb_pull_data: |
6191 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
6192 | case BPF_FUNC_csum_diff: |
6193 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
6194 | case BPF_FUNC_csum_update: |
6195 | return &bpf_csum_update_proto; | |
91bc4822 AS |
6196 | case BPF_FUNC_l3_csum_replace: |
6197 | return &bpf_l3_csum_replace_proto; | |
6198 | case BPF_FUNC_l4_csum_replace: | |
6199 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
6200 | case BPF_FUNC_clone_redirect: |
6201 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
6202 | case BPF_FUNC_get_cgroup_classid: |
6203 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
6204 | case BPF_FUNC_skb_vlan_push: |
6205 | return &bpf_skb_vlan_push_proto; | |
6206 | case BPF_FUNC_skb_vlan_pop: | |
6207 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
6208 | case BPF_FUNC_skb_change_proto: |
6209 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
6210 | case BPF_FUNC_skb_change_type: |
6211 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
6212 | case BPF_FUNC_skb_adjust_room: |
6213 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
6214 | case BPF_FUNC_skb_change_tail: |
6215 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
6216 | case BPF_FUNC_skb_get_tunnel_key: |
6217 | return &bpf_skb_get_tunnel_key_proto; | |
6218 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
6219 | return bpf_get_skb_set_tunnel_proto(func_id); |
6220 | case BPF_FUNC_skb_get_tunnel_opt: | |
6221 | return &bpf_skb_get_tunnel_opt_proto; | |
6222 | case BPF_FUNC_skb_set_tunnel_opt: | |
6223 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
6224 | case BPF_FUNC_redirect: |
6225 | return &bpf_redirect_proto; | |
c46646d0 DB |
6226 | case BPF_FUNC_get_route_realm: |
6227 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
6228 | case BPF_FUNC_get_hash_recalc: |
6229 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
6230 | case BPF_FUNC_set_hash_invalid: |
6231 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
6232 | case BPF_FUNC_set_hash: |
6233 | return &bpf_set_hash_proto; | |
bd570ff9 | 6234 | case BPF_FUNC_perf_event_output: |
555c8a86 | 6235 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
6236 | case BPF_FUNC_get_smp_processor_id: |
6237 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
6238 | case BPF_FUNC_skb_under_cgroup: |
6239 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
6240 | case BPF_FUNC_get_socket_cookie: |
6241 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
6242 | case BPF_FUNC_get_socket_uid: |
6243 | return &bpf_get_socket_uid_proto; | |
cb20b08e DB |
6244 | case BPF_FUNC_fib_lookup: |
6245 | return &bpf_skb_fib_lookup_proto; | |
46f8bc92 MKL |
6246 | case BPF_FUNC_sk_fullsock: |
6247 | return &bpf_sk_fullsock_proto; | |
6ac99e8f MKL |
6248 | case BPF_FUNC_sk_storage_get: |
6249 | return &bpf_sk_storage_get_proto; | |
6250 | case BPF_FUNC_sk_storage_delete: | |
6251 | return &bpf_sk_storage_delete_proto; | |
12bed760 EB |
6252 | #ifdef CONFIG_XFRM |
6253 | case BPF_FUNC_skb_get_xfrm_state: | |
6254 | return &bpf_skb_get_xfrm_state_proto; | |
6255 | #endif | |
cb20b08e DB |
6256 | #ifdef CONFIG_SOCK_CGROUP_DATA |
6257 | case BPF_FUNC_skb_cgroup_id: | |
6258 | return &bpf_skb_cgroup_id_proto; | |
77236281 AI |
6259 | case BPF_FUNC_skb_ancestor_cgroup_id: |
6260 | return &bpf_skb_ancestor_cgroup_id_proto; | |
cb20b08e | 6261 | #endif |
df3f94a0 | 6262 | #ifdef CONFIG_INET |
6acc9b43 JS |
6263 | case BPF_FUNC_sk_lookup_tcp: |
6264 | return &bpf_sk_lookup_tcp_proto; | |
6265 | case BPF_FUNC_sk_lookup_udp: | |
6266 | return &bpf_sk_lookup_udp_proto; | |
6267 | case BPF_FUNC_sk_release: | |
6268 | return &bpf_sk_release_proto; | |
655a51e5 MKL |
6269 | case BPF_FUNC_tcp_sock: |
6270 | return &bpf_tcp_sock_proto; | |
dbafd7dd MKL |
6271 | case BPF_FUNC_get_listener_sock: |
6272 | return &bpf_get_listener_sock_proto; | |
edbf8c01 LB |
6273 | case BPF_FUNC_skc_lookup_tcp: |
6274 | return &bpf_skc_lookup_tcp_proto; | |
39904084 LB |
6275 | case BPF_FUNC_tcp_check_syncookie: |
6276 | return &bpf_tcp_check_syncookie_proto; | |
315a2029 PO |
6277 | case BPF_FUNC_skb_ecn_set_ce: |
6278 | return &bpf_skb_ecn_set_ce_proto; | |
70d66244 PP |
6279 | case BPF_FUNC_tcp_gen_syncookie: |
6280 | return &bpf_tcp_gen_syncookie_proto; | |
cf7fbe66 JS |
6281 | case BPF_FUNC_sk_assign: |
6282 | return &bpf_sk_assign_proto; | |
df3f94a0 | 6283 | #endif |
608cd71a | 6284 | default: |
2492d3b8 | 6285 | return bpf_base_func_proto(func_id); |
608cd71a AS |
6286 | } |
6287 | } | |
6288 | ||
6a773a15 | 6289 | static const struct bpf_func_proto * |
5e43f899 | 6290 | xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
6a773a15 | 6291 | { |
4de16969 DB |
6292 | switch (func_id) { |
6293 | case BPF_FUNC_perf_event_output: | |
6294 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
6295 | case BPF_FUNC_get_smp_processor_id: |
6296 | return &bpf_get_smp_processor_id_proto; | |
205c3807 DB |
6297 | case BPF_FUNC_csum_diff: |
6298 | return &bpf_csum_diff_proto; | |
17bedab2 MKL |
6299 | case BPF_FUNC_xdp_adjust_head: |
6300 | return &bpf_xdp_adjust_head_proto; | |
de8f3a83 DB |
6301 | case BPF_FUNC_xdp_adjust_meta: |
6302 | return &bpf_xdp_adjust_meta_proto; | |
814abfab JF |
6303 | case BPF_FUNC_redirect: |
6304 | return &bpf_xdp_redirect_proto; | |
97f91a7c | 6305 | case BPF_FUNC_redirect_map: |
e4a8e817 | 6306 | return &bpf_xdp_redirect_map_proto; |
b32cc5b9 NS |
6307 | case BPF_FUNC_xdp_adjust_tail: |
6308 | return &bpf_xdp_adjust_tail_proto; | |
87f5fc7e DA |
6309 | case BPF_FUNC_fib_lookup: |
6310 | return &bpf_xdp_fib_lookup_proto; | |
c8123ead NH |
6311 | #ifdef CONFIG_INET |
6312 | case BPF_FUNC_sk_lookup_udp: | |
6313 | return &bpf_xdp_sk_lookup_udp_proto; | |
6314 | case BPF_FUNC_sk_lookup_tcp: | |
6315 | return &bpf_xdp_sk_lookup_tcp_proto; | |
6316 | case BPF_FUNC_sk_release: | |
6317 | return &bpf_sk_release_proto; | |
edbf8c01 LB |
6318 | case BPF_FUNC_skc_lookup_tcp: |
6319 | return &bpf_xdp_skc_lookup_tcp_proto; | |
39904084 LB |
6320 | case BPF_FUNC_tcp_check_syncookie: |
6321 | return &bpf_tcp_check_syncookie_proto; | |
70d66244 PP |
6322 | case BPF_FUNC_tcp_gen_syncookie: |
6323 | return &bpf_tcp_gen_syncookie_proto; | |
c8123ead | 6324 | #endif |
4de16969 | 6325 | default: |
2492d3b8 | 6326 | return bpf_base_func_proto(func_id); |
4de16969 | 6327 | } |
6a773a15 BB |
6328 | } |
6329 | ||
604326b4 DB |
6330 | const struct bpf_func_proto bpf_sock_map_update_proto __weak; |
6331 | const struct bpf_func_proto bpf_sock_hash_update_proto __weak; | |
6332 | ||
8c4b4c7e | 6333 | static const struct bpf_func_proto * |
5e43f899 | 6334 | sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
8c4b4c7e LB |
6335 | { |
6336 | switch (func_id) { | |
6337 | case BPF_FUNC_setsockopt: | |
6338 | return &bpf_setsockopt_proto; | |
cd86d1fd LB |
6339 | case BPF_FUNC_getsockopt: |
6340 | return &bpf_getsockopt_proto; | |
b13d8807 LB |
6341 | case BPF_FUNC_sock_ops_cb_flags_set: |
6342 | return &bpf_sock_ops_cb_flags_set_proto; | |
174a79ff JF |
6343 | case BPF_FUNC_sock_map_update: |
6344 | return &bpf_sock_map_update_proto; | |
81110384 JF |
6345 | case BPF_FUNC_sock_hash_update: |
6346 | return &bpf_sock_hash_update_proto; | |
d692f113 AI |
6347 | case BPF_FUNC_get_socket_cookie: |
6348 | return &bpf_get_socket_cookie_sock_ops_proto; | |
cd339431 RG |
6349 | case BPF_FUNC_get_local_storage: |
6350 | return &bpf_get_local_storage_proto; | |
a5a3a828 | 6351 | case BPF_FUNC_perf_event_output: |
fcf752ea | 6352 | return &bpf_event_output_data_proto; |
1314ef56 SF |
6353 | case BPF_FUNC_sk_storage_get: |
6354 | return &bpf_sk_storage_get_proto; | |
6355 | case BPF_FUNC_sk_storage_delete: | |
6356 | return &bpf_sk_storage_delete_proto; | |
6357 | #ifdef CONFIG_INET | |
6358 | case BPF_FUNC_tcp_sock: | |
6359 | return &bpf_tcp_sock_proto; | |
6360 | #endif /* CONFIG_INET */ | |
8c4b4c7e LB |
6361 | default: |
6362 | return bpf_base_func_proto(func_id); | |
6363 | } | |
6364 | } | |
6365 | ||
604326b4 DB |
6366 | const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; |
6367 | const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; | |
6368 | ||
5e43f899 AI |
6369 | static const struct bpf_func_proto * |
6370 | sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
4f738adb JF |
6371 | { |
6372 | switch (func_id) { | |
6373 | case BPF_FUNC_msg_redirect_map: | |
6374 | return &bpf_msg_redirect_map_proto; | |
81110384 JF |
6375 | case BPF_FUNC_msg_redirect_hash: |
6376 | return &bpf_msg_redirect_hash_proto; | |
2a100317 JF |
6377 | case BPF_FUNC_msg_apply_bytes: |
6378 | return &bpf_msg_apply_bytes_proto; | |
91843d54 JF |
6379 | case BPF_FUNC_msg_cork_bytes: |
6380 | return &bpf_msg_cork_bytes_proto; | |
015632bb JF |
6381 | case BPF_FUNC_msg_pull_data: |
6382 | return &bpf_msg_pull_data_proto; | |
6fff607e JF |
6383 | case BPF_FUNC_msg_push_data: |
6384 | return &bpf_msg_push_data_proto; | |
7246d8ed JF |
6385 | case BPF_FUNC_msg_pop_data: |
6386 | return &bpf_msg_pop_data_proto; | |
4f738adb JF |
6387 | default: |
6388 | return bpf_base_func_proto(func_id); | |
6389 | } | |
6390 | } | |
6391 | ||
604326b4 DB |
6392 | const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; |
6393 | const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; | |
6394 | ||
5e43f899 AI |
6395 | static const struct bpf_func_proto * |
6396 | sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
b005fd18 JF |
6397 | { |
6398 | switch (func_id) { | |
8a31db56 JF |
6399 | case BPF_FUNC_skb_store_bytes: |
6400 | return &bpf_skb_store_bytes_proto; | |
b005fd18 JF |
6401 | case BPF_FUNC_skb_load_bytes: |
6402 | return &bpf_skb_load_bytes_proto; | |
8a31db56 | 6403 | case BPF_FUNC_skb_pull_data: |
0ea488ff | 6404 | return &sk_skb_pull_data_proto; |
8a31db56 | 6405 | case BPF_FUNC_skb_change_tail: |
0ea488ff | 6406 | return &sk_skb_change_tail_proto; |
8a31db56 | 6407 | case BPF_FUNC_skb_change_head: |
0ea488ff | 6408 | return &sk_skb_change_head_proto; |
b005fd18 JF |
6409 | case BPF_FUNC_get_socket_cookie: |
6410 | return &bpf_get_socket_cookie_proto; | |
6411 | case BPF_FUNC_get_socket_uid: | |
6412 | return &bpf_get_socket_uid_proto; | |
174a79ff JF |
6413 | case BPF_FUNC_sk_redirect_map: |
6414 | return &bpf_sk_redirect_map_proto; | |
81110384 JF |
6415 | case BPF_FUNC_sk_redirect_hash: |
6416 | return &bpf_sk_redirect_hash_proto; | |
7c4b90d7 AZ |
6417 | case BPF_FUNC_perf_event_output: |
6418 | return &bpf_skb_event_output_proto; | |
df3f94a0 | 6419 | #ifdef CONFIG_INET |
6acc9b43 JS |
6420 | case BPF_FUNC_sk_lookup_tcp: |
6421 | return &bpf_sk_lookup_tcp_proto; | |
6422 | case BPF_FUNC_sk_lookup_udp: | |
6423 | return &bpf_sk_lookup_udp_proto; | |
6424 | case BPF_FUNC_sk_release: | |
6425 | return &bpf_sk_release_proto; | |
edbf8c01 LB |
6426 | case BPF_FUNC_skc_lookup_tcp: |
6427 | return &bpf_skc_lookup_tcp_proto; | |
df3f94a0 | 6428 | #endif |
b005fd18 JF |
6429 | default: |
6430 | return bpf_base_func_proto(func_id); | |
6431 | } | |
6432 | } | |
6433 | ||
d58e468b PP |
6434 | static const struct bpf_func_proto * |
6435 | flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6436 | { | |
6437 | switch (func_id) { | |
6438 | case BPF_FUNC_skb_load_bytes: | |
089b19a9 | 6439 | return &bpf_flow_dissector_load_bytes_proto; |
d58e468b PP |
6440 | default: |
6441 | return bpf_base_func_proto(func_id); | |
6442 | } | |
6443 | } | |
6444 | ||
cd3092c7 MX |
6445 | static const struct bpf_func_proto * |
6446 | lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6447 | { | |
6448 | switch (func_id) { | |
6449 | case BPF_FUNC_skb_load_bytes: | |
6450 | return &bpf_skb_load_bytes_proto; | |
6451 | case BPF_FUNC_skb_pull_data: | |
6452 | return &bpf_skb_pull_data_proto; | |
6453 | case BPF_FUNC_csum_diff: | |
6454 | return &bpf_csum_diff_proto; | |
6455 | case BPF_FUNC_get_cgroup_classid: | |
6456 | return &bpf_get_cgroup_classid_proto; | |
6457 | case BPF_FUNC_get_route_realm: | |
6458 | return &bpf_get_route_realm_proto; | |
6459 | case BPF_FUNC_get_hash_recalc: | |
6460 | return &bpf_get_hash_recalc_proto; | |
6461 | case BPF_FUNC_perf_event_output: | |
6462 | return &bpf_skb_event_output_proto; | |
6463 | case BPF_FUNC_get_smp_processor_id: | |
6464 | return &bpf_get_smp_processor_id_proto; | |
6465 | case BPF_FUNC_skb_under_cgroup: | |
6466 | return &bpf_skb_under_cgroup_proto; | |
6467 | default: | |
6468 | return bpf_base_func_proto(func_id); | |
6469 | } | |
6470 | } | |
6471 | ||
6472 | static const struct bpf_func_proto * | |
6473 | lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6474 | { | |
6475 | switch (func_id) { | |
6476 | case BPF_FUNC_lwt_push_encap: | |
3e0bd37c | 6477 | return &bpf_lwt_in_push_encap_proto; |
cd3092c7 MX |
6478 | default: |
6479 | return lwt_out_func_proto(func_id, prog); | |
6480 | } | |
6481 | } | |
6482 | ||
3a0af8fd | 6483 | static const struct bpf_func_proto * |
5e43f899 | 6484 | lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
3a0af8fd TG |
6485 | { |
6486 | switch (func_id) { | |
6487 | case BPF_FUNC_skb_get_tunnel_key: | |
6488 | return &bpf_skb_get_tunnel_key_proto; | |
6489 | case BPF_FUNC_skb_set_tunnel_key: | |
6490 | return bpf_get_skb_set_tunnel_proto(func_id); | |
6491 | case BPF_FUNC_skb_get_tunnel_opt: | |
6492 | return &bpf_skb_get_tunnel_opt_proto; | |
6493 | case BPF_FUNC_skb_set_tunnel_opt: | |
6494 | return bpf_get_skb_set_tunnel_proto(func_id); | |
6495 | case BPF_FUNC_redirect: | |
6496 | return &bpf_redirect_proto; | |
6497 | case BPF_FUNC_clone_redirect: | |
6498 | return &bpf_clone_redirect_proto; | |
6499 | case BPF_FUNC_skb_change_tail: | |
6500 | return &bpf_skb_change_tail_proto; | |
6501 | case BPF_FUNC_skb_change_head: | |
6502 | return &bpf_skb_change_head_proto; | |
6503 | case BPF_FUNC_skb_store_bytes: | |
6504 | return &bpf_skb_store_bytes_proto; | |
6505 | case BPF_FUNC_csum_update: | |
6506 | return &bpf_csum_update_proto; | |
6507 | case BPF_FUNC_l3_csum_replace: | |
6508 | return &bpf_l3_csum_replace_proto; | |
6509 | case BPF_FUNC_l4_csum_replace: | |
6510 | return &bpf_l4_csum_replace_proto; | |
6511 | case BPF_FUNC_set_hash_invalid: | |
6512 | return &bpf_set_hash_invalid_proto; | |
3e0bd37c PO |
6513 | case BPF_FUNC_lwt_push_encap: |
6514 | return &bpf_lwt_xmit_push_encap_proto; | |
3a0af8fd | 6515 | default: |
cd3092c7 | 6516 | return lwt_out_func_proto(func_id, prog); |
3a0af8fd TG |
6517 | } |
6518 | } | |
6519 | ||
004d4b27 MX |
6520 | static const struct bpf_func_proto * |
6521 | lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
6522 | { | |
6523 | switch (func_id) { | |
61d76980 | 6524 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
004d4b27 MX |
6525 | case BPF_FUNC_lwt_seg6_store_bytes: |
6526 | return &bpf_lwt_seg6_store_bytes_proto; | |
6527 | case BPF_FUNC_lwt_seg6_action: | |
6528 | return &bpf_lwt_seg6_action_proto; | |
6529 | case BPF_FUNC_lwt_seg6_adjust_srh: | |
6530 | return &bpf_lwt_seg6_adjust_srh_proto; | |
61d76980 | 6531 | #endif |
004d4b27 MX |
6532 | default: |
6533 | return lwt_out_func_proto(func_id, prog); | |
3a0af8fd TG |
6534 | } |
6535 | } | |
6536 | ||
f96da094 | 6537 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 6538 | const struct bpf_prog *prog, |
f96da094 | 6539 | struct bpf_insn_access_aux *info) |
23994631 | 6540 | { |
f96da094 | 6541 | const int size_default = sizeof(__u32); |
23994631 | 6542 | |
9bac3d6d AS |
6543 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
6544 | return false; | |
62c7989b | 6545 | |
4936e352 | 6546 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
6547 | if (off % size != 0) |
6548 | return false; | |
62c7989b DB |
6549 | |
6550 | switch (off) { | |
f96da094 DB |
6551 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
6552 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
6553 | return false; |
6554 | break; | |
8a31db56 JF |
6555 | case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
6556 | case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): | |
6557 | case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): | |
6558 | case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): | |
f96da094 | 6559 | case bpf_ctx_range(struct __sk_buff, data): |
de8f3a83 | 6560 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 DB |
6561 | case bpf_ctx_range(struct __sk_buff, data_end): |
6562 | if (size != size_default) | |
23994631 | 6563 | return false; |
31fd8581 | 6564 | break; |
b7df9ada | 6565 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
089b19a9 | 6566 | return false; |
f11216b2 VD |
6567 | case bpf_ctx_range(struct __sk_buff, tstamp): |
6568 | if (size != sizeof(__u64)) | |
6569 | return false; | |
6570 | break; | |
46f8bc92 MKL |
6571 | case offsetof(struct __sk_buff, sk): |
6572 | if (type == BPF_WRITE || size != sizeof(__u64)) | |
6573 | return false; | |
6574 | info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; | |
6575 | break; | |
31fd8581 | 6576 | default: |
f96da094 | 6577 | /* Only narrow read access allowed for now. */ |
31fd8581 | 6578 | if (type == BPF_WRITE) { |
f96da094 | 6579 | if (size != size_default) |
31fd8581 YS |
6580 | return false; |
6581 | } else { | |
f96da094 DB |
6582 | bpf_ctx_record_field_size(info, size_default); |
6583 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 6584 | return false; |
31fd8581 | 6585 | } |
62c7989b | 6586 | } |
9bac3d6d AS |
6587 | |
6588 | return true; | |
6589 | } | |
6590 | ||
d691f9e8 | 6591 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 6592 | enum bpf_access_type type, |
5e43f899 | 6593 | const struct bpf_prog *prog, |
23994631 | 6594 | struct bpf_insn_access_aux *info) |
d691f9e8 | 6595 | { |
db58ba45 | 6596 | switch (off) { |
f96da094 DB |
6597 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
6598 | case bpf_ctx_range(struct __sk_buff, data): | |
de8f3a83 | 6599 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 | 6600 | case bpf_ctx_range(struct __sk_buff, data_end): |
8a31db56 | 6601 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
f11216b2 | 6602 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 6603 | case bpf_ctx_range(struct __sk_buff, wire_len): |
045efa82 | 6604 | return false; |
db58ba45 | 6605 | } |
045efa82 | 6606 | |
d691f9e8 AS |
6607 | if (type == BPF_WRITE) { |
6608 | switch (off) { | |
f96da094 | 6609 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
6610 | break; |
6611 | default: | |
6612 | return false; | |
6613 | } | |
6614 | } | |
6615 | ||
5e43f899 | 6616 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
6617 | } |
6618 | ||
b39b5f41 SL |
6619 | static bool cg_skb_is_valid_access(int off, int size, |
6620 | enum bpf_access_type type, | |
6621 | const struct bpf_prog *prog, | |
6622 | struct bpf_insn_access_aux *info) | |
6623 | { | |
6624 | switch (off) { | |
6625 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
6626 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
e3da08d0 | 6627 | case bpf_ctx_range(struct __sk_buff, wire_len): |
b39b5f41 | 6628 | return false; |
ab21c1b5 DB |
6629 | case bpf_ctx_range(struct __sk_buff, data): |
6630 | case bpf_ctx_range(struct __sk_buff, data_end): | |
6631 | if (!capable(CAP_SYS_ADMIN)) | |
6632 | return false; | |
6633 | break; | |
b39b5f41 | 6634 | } |
ab21c1b5 | 6635 | |
b39b5f41 SL |
6636 | if (type == BPF_WRITE) { |
6637 | switch (off) { | |
6638 | case bpf_ctx_range(struct __sk_buff, mark): | |
6639 | case bpf_ctx_range(struct __sk_buff, priority): | |
6640 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
6641 | break; | |
f11216b2 VD |
6642 | case bpf_ctx_range(struct __sk_buff, tstamp): |
6643 | if (!capable(CAP_SYS_ADMIN)) | |
6644 | return false; | |
6645 | break; | |
b39b5f41 SL |
6646 | default: |
6647 | return false; | |
6648 | } | |
6649 | } | |
6650 | ||
6651 | switch (off) { | |
6652 | case bpf_ctx_range(struct __sk_buff, data): | |
6653 | info->reg_type = PTR_TO_PACKET; | |
6654 | break; | |
6655 | case bpf_ctx_range(struct __sk_buff, data_end): | |
6656 | info->reg_type = PTR_TO_PACKET_END; | |
6657 | break; | |
6658 | } | |
6659 | ||
6660 | return bpf_skb_is_valid_access(off, size, type, prog, info); | |
6661 | } | |
6662 | ||
3a0af8fd TG |
6663 | static bool lwt_is_valid_access(int off, int size, |
6664 | enum bpf_access_type type, | |
5e43f899 | 6665 | const struct bpf_prog *prog, |
23994631 | 6666 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
6667 | { |
6668 | switch (off) { | |
f96da094 | 6669 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
8a31db56 | 6670 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
de8f3a83 | 6671 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f11216b2 | 6672 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 6673 | case bpf_ctx_range(struct __sk_buff, wire_len): |
3a0af8fd TG |
6674 | return false; |
6675 | } | |
6676 | ||
6677 | if (type == BPF_WRITE) { | |
6678 | switch (off) { | |
f96da094 DB |
6679 | case bpf_ctx_range(struct __sk_buff, mark): |
6680 | case bpf_ctx_range(struct __sk_buff, priority): | |
6681 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
6682 | break; |
6683 | default: | |
6684 | return false; | |
6685 | } | |
6686 | } | |
6687 | ||
f96da094 DB |
6688 | switch (off) { |
6689 | case bpf_ctx_range(struct __sk_buff, data): | |
6690 | info->reg_type = PTR_TO_PACKET; | |
6691 | break; | |
6692 | case bpf_ctx_range(struct __sk_buff, data_end): | |
6693 | info->reg_type = PTR_TO_PACKET_END; | |
6694 | break; | |
6695 | } | |
6696 | ||
5e43f899 | 6697 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
3a0af8fd TG |
6698 | } |
6699 | ||
aac3fc32 AI |
6700 | /* Attach type specific accesses */ |
6701 | static bool __sock_filter_check_attach_type(int off, | |
6702 | enum bpf_access_type access_type, | |
6703 | enum bpf_attach_type attach_type) | |
61023658 | 6704 | { |
aac3fc32 AI |
6705 | switch (off) { |
6706 | case offsetof(struct bpf_sock, bound_dev_if): | |
6707 | case offsetof(struct bpf_sock, mark): | |
6708 | case offsetof(struct bpf_sock, priority): | |
6709 | switch (attach_type) { | |
6710 | case BPF_CGROUP_INET_SOCK_CREATE: | |
6711 | goto full_access; | |
6712 | default: | |
6713 | return false; | |
6714 | } | |
6715 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
6716 | switch (attach_type) { | |
6717 | case BPF_CGROUP_INET4_POST_BIND: | |
6718 | goto read_only; | |
6719 | default: | |
6720 | return false; | |
6721 | } | |
6722 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
6723 | switch (attach_type) { | |
6724 | case BPF_CGROUP_INET6_POST_BIND: | |
6725 | goto read_only; | |
6726 | default: | |
6727 | return false; | |
6728 | } | |
6729 | case bpf_ctx_range(struct bpf_sock, src_port): | |
6730 | switch (attach_type) { | |
6731 | case BPF_CGROUP_INET4_POST_BIND: | |
6732 | case BPF_CGROUP_INET6_POST_BIND: | |
6733 | goto read_only; | |
61023658 DA |
6734 | default: |
6735 | return false; | |
6736 | } | |
6737 | } | |
aac3fc32 AI |
6738 | read_only: |
6739 | return access_type == BPF_READ; | |
6740 | full_access: | |
6741 | return true; | |
6742 | } | |
6743 | ||
46f8bc92 MKL |
6744 | bool bpf_sock_common_is_valid_access(int off, int size, |
6745 | enum bpf_access_type type, | |
aac3fc32 AI |
6746 | struct bpf_insn_access_aux *info) |
6747 | { | |
aac3fc32 | 6748 | switch (off) { |
46f8bc92 MKL |
6749 | case bpf_ctx_range_till(struct bpf_sock, type, priority): |
6750 | return false; | |
6751 | default: | |
6752 | return bpf_sock_is_valid_access(off, size, type, info); | |
aac3fc32 | 6753 | } |
aac3fc32 AI |
6754 | } |
6755 | ||
c64b7983 JS |
6756 | bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
6757 | struct bpf_insn_access_aux *info) | |
aac3fc32 | 6758 | { |
aa65d696 MKL |
6759 | const int size_default = sizeof(__u32); |
6760 | ||
aac3fc32 | 6761 | if (off < 0 || off >= sizeof(struct bpf_sock)) |
61023658 | 6762 | return false; |
61023658 DA |
6763 | if (off % size != 0) |
6764 | return false; | |
aa65d696 MKL |
6765 | |
6766 | switch (off) { | |
6767 | case offsetof(struct bpf_sock, state): | |
6768 | case offsetof(struct bpf_sock, family): | |
6769 | case offsetof(struct bpf_sock, type): | |
6770 | case offsetof(struct bpf_sock, protocol): | |
6771 | case offsetof(struct bpf_sock, dst_port): | |
6772 | case offsetof(struct bpf_sock, src_port): | |
6773 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
6774 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
6775 | case bpf_ctx_range(struct bpf_sock, dst_ip4): | |
6776 | case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): | |
6777 | bpf_ctx_record_field_size(info, size_default); | |
6778 | return bpf_ctx_narrow_access_ok(off, size, size_default); | |
6779 | } | |
6780 | ||
6781 | return size == size_default; | |
61023658 DA |
6782 | } |
6783 | ||
c64b7983 JS |
6784 | static bool sock_filter_is_valid_access(int off, int size, |
6785 | enum bpf_access_type type, | |
6786 | const struct bpf_prog *prog, | |
6787 | struct bpf_insn_access_aux *info) | |
6788 | { | |
6789 | if (!bpf_sock_is_valid_access(off, size, type, info)) | |
6790 | return false; | |
6791 | return __sock_filter_check_attach_type(off, type, | |
6792 | prog->expected_attach_type); | |
6793 | } | |
6794 | ||
b09928b9 DB |
6795 | static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, |
6796 | const struct bpf_prog *prog) | |
6797 | { | |
6798 | /* Neither direct read nor direct write requires any preliminary | |
6799 | * action. | |
6800 | */ | |
6801 | return 0; | |
6802 | } | |
6803 | ||
047b0ecd DB |
6804 | static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
6805 | const struct bpf_prog *prog, int drop_verdict) | |
36bbef52 DB |
6806 | { |
6807 | struct bpf_insn *insn = insn_buf; | |
6808 | ||
6809 | if (!direct_write) | |
6810 | return 0; | |
6811 | ||
6812 | /* if (!skb->cloned) | |
6813 | * goto start; | |
6814 | * | |
6815 | * (Fast-path, otherwise approximation that we might be | |
6816 | * a clone, do the rest in helper.) | |
6817 | */ | |
6818 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
6819 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
6820 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
6821 | ||
6822 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
6823 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
6824 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
6825 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
6826 | BPF_FUNC_skb_pull_data); | |
6827 | /* if (!ret) | |
6828 | * goto restore; | |
6829 | * return TC_ACT_SHOT; | |
6830 | */ | |
6831 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
047b0ecd | 6832 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
36bbef52 DB |
6833 | *insn++ = BPF_EXIT_INSN(); |
6834 | ||
6835 | /* restore: */ | |
6836 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
6837 | /* start: */ | |
6838 | *insn++ = prog->insnsi[0]; | |
6839 | ||
6840 | return insn - insn_buf; | |
6841 | } | |
6842 | ||
e0cea7ce DB |
6843 | static int bpf_gen_ld_abs(const struct bpf_insn *orig, |
6844 | struct bpf_insn *insn_buf) | |
6845 | { | |
6846 | bool indirect = BPF_MODE(orig->code) == BPF_IND; | |
6847 | struct bpf_insn *insn = insn_buf; | |
6848 | ||
6849 | /* We're guaranteed here that CTX is in R6. */ | |
6850 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); | |
6851 | if (!indirect) { | |
6852 | *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); | |
6853 | } else { | |
6854 | *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); | |
6855 | if (orig->imm) | |
6856 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); | |
6857 | } | |
6858 | ||
6859 | switch (BPF_SIZE(orig->code)) { | |
6860 | case BPF_B: | |
6861 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); | |
6862 | break; | |
6863 | case BPF_H: | |
6864 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); | |
6865 | break; | |
6866 | case BPF_W: | |
6867 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); | |
6868 | break; | |
6869 | } | |
6870 | ||
6871 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); | |
6872 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); | |
6873 | *insn++ = BPF_EXIT_INSN(); | |
6874 | ||
6875 | return insn - insn_buf; | |
6876 | } | |
6877 | ||
047b0ecd DB |
6878 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
6879 | const struct bpf_prog *prog) | |
6880 | { | |
6881 | return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); | |
6882 | } | |
6883 | ||
d691f9e8 | 6884 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 6885 | enum bpf_access_type type, |
5e43f899 | 6886 | const struct bpf_prog *prog, |
23994631 | 6887 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
6888 | { |
6889 | if (type == BPF_WRITE) { | |
6890 | switch (off) { | |
f96da094 DB |
6891 | case bpf_ctx_range(struct __sk_buff, mark): |
6892 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
6893 | case bpf_ctx_range(struct __sk_buff, priority): | |
6894 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
6895 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
f11216b2 | 6896 | case bpf_ctx_range(struct __sk_buff, tstamp): |
74e31ca8 | 6897 | case bpf_ctx_range(struct __sk_buff, queue_mapping): |
d691f9e8 AS |
6898 | break; |
6899 | default: | |
6900 | return false; | |
6901 | } | |
6902 | } | |
19de99f7 | 6903 | |
f96da094 DB |
6904 | switch (off) { |
6905 | case bpf_ctx_range(struct __sk_buff, data): | |
6906 | info->reg_type = PTR_TO_PACKET; | |
6907 | break; | |
de8f3a83 DB |
6908 | case bpf_ctx_range(struct __sk_buff, data_meta): |
6909 | info->reg_type = PTR_TO_PACKET_META; | |
6910 | break; | |
f96da094 DB |
6911 | case bpf_ctx_range(struct __sk_buff, data_end): |
6912 | info->reg_type = PTR_TO_PACKET_END; | |
6913 | break; | |
8a31db56 JF |
6914 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
6915 | return false; | |
f96da094 DB |
6916 | } |
6917 | ||
5e43f899 | 6918 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
6919 | } |
6920 | ||
1afaf661 | 6921 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
6922 | { |
6923 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
6924 | return false; | |
6925 | if (off % size != 0) | |
6926 | return false; | |
6088b582 | 6927 | if (size != sizeof(__u32)) |
6a773a15 BB |
6928 | return false; |
6929 | ||
6930 | return true; | |
6931 | } | |
6932 | ||
6933 | static bool xdp_is_valid_access(int off, int size, | |
6934 | enum bpf_access_type type, | |
5e43f899 | 6935 | const struct bpf_prog *prog, |
23994631 | 6936 | struct bpf_insn_access_aux *info) |
6a773a15 | 6937 | { |
0d830032 JK |
6938 | if (type == BPF_WRITE) { |
6939 | if (bpf_prog_is_dev_bound(prog->aux)) { | |
6940 | switch (off) { | |
6941 | case offsetof(struct xdp_md, rx_queue_index): | |
6942 | return __is_valid_xdp_access(off, size); | |
6943 | } | |
6944 | } | |
6a773a15 | 6945 | return false; |
0d830032 | 6946 | } |
6a773a15 BB |
6947 | |
6948 | switch (off) { | |
6949 | case offsetof(struct xdp_md, data): | |
23994631 | 6950 | info->reg_type = PTR_TO_PACKET; |
6a773a15 | 6951 | break; |
de8f3a83 DB |
6952 | case offsetof(struct xdp_md, data_meta): |
6953 | info->reg_type = PTR_TO_PACKET_META; | |
6954 | break; | |
6a773a15 | 6955 | case offsetof(struct xdp_md, data_end): |
23994631 | 6956 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
6957 | break; |
6958 | } | |
6959 | ||
1afaf661 | 6960 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
6961 | } |
6962 | ||
6963 | void bpf_warn_invalid_xdp_action(u32 act) | |
6964 | { | |
9beb8bed DB |
6965 | const u32 act_max = XDP_REDIRECT; |
6966 | ||
6967 | WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", | |
6968 | act > act_max ? "Illegal" : "Driver unsupported", | |
6969 | act); | |
6a773a15 BB |
6970 | } |
6971 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
6972 | ||
4fbac77d AI |
6973 | static bool sock_addr_is_valid_access(int off, int size, |
6974 | enum bpf_access_type type, | |
6975 | const struct bpf_prog *prog, | |
6976 | struct bpf_insn_access_aux *info) | |
6977 | { | |
6978 | const int size_default = sizeof(__u32); | |
6979 | ||
6980 | if (off < 0 || off >= sizeof(struct bpf_sock_addr)) | |
6981 | return false; | |
6982 | if (off % size != 0) | |
6983 | return false; | |
6984 | ||
6985 | /* Disallow access to IPv6 fields from IPv4 contex and vise | |
6986 | * versa. | |
6987 | */ | |
6988 | switch (off) { | |
6989 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
6990 | switch (prog->expected_attach_type) { | |
6991 | case BPF_CGROUP_INET4_BIND: | |
d74bad4e | 6992 | case BPF_CGROUP_INET4_CONNECT: |
1cedee13 | 6993 | case BPF_CGROUP_UDP4_SENDMSG: |
983695fa | 6994 | case BPF_CGROUP_UDP4_RECVMSG: |
4fbac77d AI |
6995 | break; |
6996 | default: | |
6997 | return false; | |
6998 | } | |
6999 | break; | |
7000 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
7001 | switch (prog->expected_attach_type) { | |
7002 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e | 7003 | case BPF_CGROUP_INET6_CONNECT: |
1cedee13 | 7004 | case BPF_CGROUP_UDP6_SENDMSG: |
983695fa | 7005 | case BPF_CGROUP_UDP6_RECVMSG: |
1cedee13 AI |
7006 | break; |
7007 | default: | |
7008 | return false; | |
7009 | } | |
7010 | break; | |
7011 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): | |
7012 | switch (prog->expected_attach_type) { | |
7013 | case BPF_CGROUP_UDP4_SENDMSG: | |
7014 | break; | |
7015 | default: | |
7016 | return false; | |
7017 | } | |
7018 | break; | |
7019 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
7020 | msg_src_ip6[3]): | |
7021 | switch (prog->expected_attach_type) { | |
7022 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
7023 | break; |
7024 | default: | |
7025 | return false; | |
7026 | } | |
7027 | break; | |
7028 | } | |
7029 | ||
7030 | switch (off) { | |
7031 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
7032 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
1cedee13 AI |
7033 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): |
7034 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
7035 | msg_src_ip6[3]): | |
4fbac77d AI |
7036 | if (type == BPF_READ) { |
7037 | bpf_ctx_record_field_size(info, size_default); | |
d4ecfeb1 SF |
7038 | |
7039 | if (bpf_ctx_wide_access_ok(off, size, | |
7040 | struct bpf_sock_addr, | |
7041 | user_ip6)) | |
7042 | return true; | |
7043 | ||
7044 | if (bpf_ctx_wide_access_ok(off, size, | |
7045 | struct bpf_sock_addr, | |
7046 | msg_src_ip6)) | |
7047 | return true; | |
7048 | ||
4fbac77d AI |
7049 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) |
7050 | return false; | |
7051 | } else { | |
b4399546 SF |
7052 | if (bpf_ctx_wide_access_ok(off, size, |
7053 | struct bpf_sock_addr, | |
7054 | user_ip6)) | |
600c70ba SF |
7055 | return true; |
7056 | ||
b4399546 SF |
7057 | if (bpf_ctx_wide_access_ok(off, size, |
7058 | struct bpf_sock_addr, | |
7059 | msg_src_ip6)) | |
600c70ba SF |
7060 | return true; |
7061 | ||
4fbac77d AI |
7062 | if (size != size_default) |
7063 | return false; | |
7064 | } | |
7065 | break; | |
7066 | case bpf_ctx_range(struct bpf_sock_addr, user_port): | |
7067 | if (size != size_default) | |
7068 | return false; | |
7069 | break; | |
fb85c4a7 SF |
7070 | case offsetof(struct bpf_sock_addr, sk): |
7071 | if (type != BPF_READ) | |
7072 | return false; | |
7073 | if (size != sizeof(__u64)) | |
7074 | return false; | |
7075 | info->reg_type = PTR_TO_SOCKET; | |
7076 | break; | |
4fbac77d AI |
7077 | default: |
7078 | if (type == BPF_READ) { | |
7079 | if (size != size_default) | |
7080 | return false; | |
7081 | } else { | |
7082 | return false; | |
7083 | } | |
7084 | } | |
7085 | ||
7086 | return true; | |
7087 | } | |
7088 | ||
44f0e430 LB |
7089 | static bool sock_ops_is_valid_access(int off, int size, |
7090 | enum bpf_access_type type, | |
5e43f899 | 7091 | const struct bpf_prog *prog, |
44f0e430 | 7092 | struct bpf_insn_access_aux *info) |
40304b2a | 7093 | { |
44f0e430 LB |
7094 | const int size_default = sizeof(__u32); |
7095 | ||
40304b2a LB |
7096 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) |
7097 | return false; | |
44f0e430 | 7098 | |
40304b2a LB |
7099 | /* The verifier guarantees that size > 0. */ |
7100 | if (off % size != 0) | |
7101 | return false; | |
40304b2a | 7102 | |
40304b2a LB |
7103 | if (type == BPF_WRITE) { |
7104 | switch (off) { | |
2585cd62 | 7105 | case offsetof(struct bpf_sock_ops, reply): |
6f9bd3d7 | 7106 | case offsetof(struct bpf_sock_ops, sk_txhash): |
44f0e430 LB |
7107 | if (size != size_default) |
7108 | return false; | |
40304b2a LB |
7109 | break; |
7110 | default: | |
7111 | return false; | |
7112 | } | |
44f0e430 LB |
7113 | } else { |
7114 | switch (off) { | |
7115 | case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, | |
7116 | bytes_acked): | |
7117 | if (size != sizeof(__u64)) | |
7118 | return false; | |
7119 | break; | |
1314ef56 SF |
7120 | case offsetof(struct bpf_sock_ops, sk): |
7121 | if (size != sizeof(__u64)) | |
7122 | return false; | |
7123 | info->reg_type = PTR_TO_SOCKET_OR_NULL; | |
7124 | break; | |
44f0e430 LB |
7125 | default: |
7126 | if (size != size_default) | |
7127 | return false; | |
7128 | break; | |
7129 | } | |
40304b2a LB |
7130 | } |
7131 | ||
44f0e430 | 7132 | return true; |
40304b2a LB |
7133 | } |
7134 | ||
8a31db56 JF |
7135 | static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
7136 | const struct bpf_prog *prog) | |
7137 | { | |
047b0ecd | 7138 | return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
8a31db56 JF |
7139 | } |
7140 | ||
b005fd18 JF |
7141 | static bool sk_skb_is_valid_access(int off, int size, |
7142 | enum bpf_access_type type, | |
5e43f899 | 7143 | const struct bpf_prog *prog, |
b005fd18 JF |
7144 | struct bpf_insn_access_aux *info) |
7145 | { | |
de8f3a83 DB |
7146 | switch (off) { |
7147 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
7148 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
f11216b2 | 7149 | case bpf_ctx_range(struct __sk_buff, tstamp): |
e3da08d0 | 7150 | case bpf_ctx_range(struct __sk_buff, wire_len): |
de8f3a83 DB |
7151 | return false; |
7152 | } | |
7153 | ||
8a31db56 JF |
7154 | if (type == BPF_WRITE) { |
7155 | switch (off) { | |
8a31db56 JF |
7156 | case bpf_ctx_range(struct __sk_buff, tc_index): |
7157 | case bpf_ctx_range(struct __sk_buff, priority): | |
7158 | break; | |
7159 | default: | |
7160 | return false; | |
7161 | } | |
7162 | } | |
7163 | ||
b005fd18 | 7164 | switch (off) { |
f7e9cb1e | 7165 | case bpf_ctx_range(struct __sk_buff, mark): |
8a31db56 | 7166 | return false; |
b005fd18 JF |
7167 | case bpf_ctx_range(struct __sk_buff, data): |
7168 | info->reg_type = PTR_TO_PACKET; | |
7169 | break; | |
7170 | case bpf_ctx_range(struct __sk_buff, data_end): | |
7171 | info->reg_type = PTR_TO_PACKET_END; | |
7172 | break; | |
7173 | } | |
7174 | ||
5e43f899 | 7175 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
b005fd18 JF |
7176 | } |
7177 | ||
4f738adb JF |
7178 | static bool sk_msg_is_valid_access(int off, int size, |
7179 | enum bpf_access_type type, | |
5e43f899 | 7180 | const struct bpf_prog *prog, |
4f738adb JF |
7181 | struct bpf_insn_access_aux *info) |
7182 | { | |
7183 | if (type == BPF_WRITE) | |
7184 | return false; | |
7185 | ||
bc1b4f01 JF |
7186 | if (off % size != 0) |
7187 | return false; | |
7188 | ||
4f738adb JF |
7189 | switch (off) { |
7190 | case offsetof(struct sk_msg_md, data): | |
7191 | info->reg_type = PTR_TO_PACKET; | |
303def35 JF |
7192 | if (size != sizeof(__u64)) |
7193 | return false; | |
4f738adb JF |
7194 | break; |
7195 | case offsetof(struct sk_msg_md, data_end): | |
7196 | info->reg_type = PTR_TO_PACKET_END; | |
303def35 JF |
7197 | if (size != sizeof(__u64)) |
7198 | return false; | |
4f738adb | 7199 | break; |
bc1b4f01 JF |
7200 | case bpf_ctx_range(struct sk_msg_md, family): |
7201 | case bpf_ctx_range(struct sk_msg_md, remote_ip4): | |
7202 | case bpf_ctx_range(struct sk_msg_md, local_ip4): | |
7203 | case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): | |
7204 | case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): | |
7205 | case bpf_ctx_range(struct sk_msg_md, remote_port): | |
7206 | case bpf_ctx_range(struct sk_msg_md, local_port): | |
7207 | case bpf_ctx_range(struct sk_msg_md, size): | |
303def35 JF |
7208 | if (size != sizeof(__u32)) |
7209 | return false; | |
bc1b4f01 JF |
7210 | break; |
7211 | default: | |
4f738adb | 7212 | return false; |
bc1b4f01 | 7213 | } |
4f738adb JF |
7214 | return true; |
7215 | } | |
7216 | ||
d58e468b PP |
7217 | static bool flow_dissector_is_valid_access(int off, int size, |
7218 | enum bpf_access_type type, | |
7219 | const struct bpf_prog *prog, | |
7220 | struct bpf_insn_access_aux *info) | |
7221 | { | |
089b19a9 SF |
7222 | const int size_default = sizeof(__u32); |
7223 | ||
7224 | if (off < 0 || off >= sizeof(struct __sk_buff)) | |
7225 | return false; | |
7226 | ||
2ee7fba0 SF |
7227 | if (type == BPF_WRITE) |
7228 | return false; | |
d58e468b PP |
7229 | |
7230 | switch (off) { | |
7231 | case bpf_ctx_range(struct __sk_buff, data): | |
089b19a9 SF |
7232 | if (size != size_default) |
7233 | return false; | |
d58e468b | 7234 | info->reg_type = PTR_TO_PACKET; |
089b19a9 | 7235 | return true; |
d58e468b | 7236 | case bpf_ctx_range(struct __sk_buff, data_end): |
089b19a9 SF |
7237 | if (size != size_default) |
7238 | return false; | |
d58e468b | 7239 | info->reg_type = PTR_TO_PACKET_END; |
089b19a9 | 7240 | return true; |
b7df9ada | 7241 | case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
089b19a9 SF |
7242 | if (size != sizeof(__u64)) |
7243 | return false; | |
d58e468b | 7244 | info->reg_type = PTR_TO_FLOW_KEYS; |
089b19a9 | 7245 | return true; |
2ee7fba0 | 7246 | default: |
d58e468b PP |
7247 | return false; |
7248 | } | |
089b19a9 | 7249 | } |
d58e468b | 7250 | |
089b19a9 SF |
7251 | static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, |
7252 | const struct bpf_insn *si, | |
7253 | struct bpf_insn *insn_buf, | |
7254 | struct bpf_prog *prog, | |
7255 | u32 *target_size) | |
7256 | ||
7257 | { | |
7258 | struct bpf_insn *insn = insn_buf; | |
7259 | ||
7260 | switch (si->off) { | |
7261 | case offsetof(struct __sk_buff, data): | |
7262 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), | |
7263 | si->dst_reg, si->src_reg, | |
7264 | offsetof(struct bpf_flow_dissector, data)); | |
7265 | break; | |
7266 | ||
7267 | case offsetof(struct __sk_buff, data_end): | |
7268 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), | |
7269 | si->dst_reg, si->src_reg, | |
7270 | offsetof(struct bpf_flow_dissector, data_end)); | |
7271 | break; | |
7272 | ||
7273 | case offsetof(struct __sk_buff, flow_keys): | |
7274 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), | |
7275 | si->dst_reg, si->src_reg, | |
7276 | offsetof(struct bpf_flow_dissector, flow_keys)); | |
7277 | break; | |
7278 | } | |
7279 | ||
7280 | return insn - insn_buf; | |
d58e468b PP |
7281 | } |
7282 | ||
cf62089b WB |
7283 | static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si, |
7284 | struct bpf_insn *insn) | |
7285 | { | |
7286 | /* si->dst_reg = skb_shinfo(SKB); */ | |
7287 | #ifdef NET_SKBUFF_DATA_USES_OFFSET | |
7288 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), | |
7289 | BPF_REG_AX, si->src_reg, | |
7290 | offsetof(struct sk_buff, end)); | |
7291 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), | |
7292 | si->dst_reg, si->src_reg, | |
7293 | offsetof(struct sk_buff, head)); | |
7294 | *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); | |
7295 | #else | |
7296 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), | |
7297 | si->dst_reg, si->src_reg, | |
7298 | offsetof(struct sk_buff, end)); | |
7299 | #endif | |
7300 | ||
7301 | return insn; | |
7302 | } | |
7303 | ||
2492d3b8 DB |
7304 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
7305 | const struct bpf_insn *si, | |
7306 | struct bpf_insn *insn_buf, | |
f96da094 | 7307 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
7308 | { |
7309 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 7310 | int off; |
9bac3d6d | 7311 | |
6b8cc1d1 | 7312 | switch (si->off) { |
9bac3d6d | 7313 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 7314 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7315 | bpf_target_off(struct sk_buff, len, 4, |
7316 | target_size)); | |
9bac3d6d AS |
7317 | break; |
7318 | ||
0b8c707d | 7319 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 7320 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
7321 | bpf_target_off(struct sk_buff, protocol, 2, |
7322 | target_size)); | |
0b8c707d DB |
7323 | break; |
7324 | ||
27cd5452 | 7325 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 7326 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
7327 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
7328 | target_size)); | |
27cd5452 MS |
7329 | break; |
7330 | ||
bcad5718 | 7331 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 7332 | if (type == BPF_WRITE) |
6b8cc1d1 | 7333 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7334 | bpf_target_off(struct sk_buff, priority, 4, |
7335 | target_size)); | |
754f1e6a | 7336 | else |
6b8cc1d1 | 7337 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7338 | bpf_target_off(struct sk_buff, priority, 4, |
7339 | target_size)); | |
bcad5718 DB |
7340 | break; |
7341 | ||
37e82c2f | 7342 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 7343 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7344 | bpf_target_off(struct sk_buff, skb_iif, 4, |
7345 | target_size)); | |
37e82c2f AS |
7346 | break; |
7347 | ||
7348 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 7349 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 7350 | si->dst_reg, si->src_reg, |
37e82c2f | 7351 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
7352 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
7353 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
7354 | bpf_target_off(struct net_device, ifindex, 4, |
7355 | target_size)); | |
37e82c2f AS |
7356 | break; |
7357 | ||
ba7591d8 | 7358 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 7359 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7360 | bpf_target_off(struct sk_buff, hash, 4, |
7361 | target_size)); | |
ba7591d8 DB |
7362 | break; |
7363 | ||
9bac3d6d | 7364 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 7365 | if (type == BPF_WRITE) |
6b8cc1d1 | 7366 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7367 | bpf_target_off(struct sk_buff, mark, 4, |
7368 | target_size)); | |
d691f9e8 | 7369 | else |
6b8cc1d1 | 7370 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7371 | bpf_target_off(struct sk_buff, mark, 4, |
7372 | target_size)); | |
d691f9e8 | 7373 | break; |
9bac3d6d AS |
7374 | |
7375 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
7376 | *target_size = 1; |
7377 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
7378 | PKT_TYPE_OFFSET()); | |
7379 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
7380 | #ifdef __BIG_ENDIAN_BITFIELD | |
7381 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
7382 | #endif | |
7383 | break; | |
9bac3d6d AS |
7384 | |
7385 | case offsetof(struct __sk_buff, queue_mapping): | |
74e31ca8 JDB |
7386 | if (type == BPF_WRITE) { |
7387 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); | |
7388 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
7389 | bpf_target_off(struct sk_buff, | |
7390 | queue_mapping, | |
7391 | 2, target_size)); | |
7392 | } else { | |
7393 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
7394 | bpf_target_off(struct sk_buff, | |
7395 | queue_mapping, | |
7396 | 2, target_size)); | |
7397 | } | |
f96da094 | 7398 | break; |
c2497395 | 7399 | |
c2497395 | 7400 | case offsetof(struct __sk_buff, vlan_present): |
9c212255 MM |
7401 | *target_size = 1; |
7402 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
7403 | PKT_VLAN_PRESENT_OFFSET()); | |
7404 | if (PKT_VLAN_PRESENT_BIT) | |
7405 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); | |
7406 | if (PKT_VLAN_PRESENT_BIT < 7) | |
7407 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
7408 | break; | |
f96da094 | 7409 | |
9c212255 | 7410 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
7411 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
7412 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
7413 | target_size)); | |
f96da094 | 7414 | break; |
d691f9e8 AS |
7415 | |
7416 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 7417 | offsetofend(struct __sk_buff, cb[4]) - 1: |
c593642c | 7418 | BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
7419 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
7420 | offsetof(struct qdisc_skb_cb, data)) % | |
7421 | sizeof(__u64)); | |
d691f9e8 | 7422 | |
ff936a04 | 7423 | prog->cb_access = 1; |
6b8cc1d1 DB |
7424 | off = si->off; |
7425 | off -= offsetof(struct __sk_buff, cb[0]); | |
7426 | off += offsetof(struct sk_buff, cb); | |
7427 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 7428 | if (type == BPF_WRITE) |
62c7989b | 7429 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 7430 | si->src_reg, off); |
d691f9e8 | 7431 | else |
62c7989b | 7432 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 7433 | si->src_reg, off); |
d691f9e8 AS |
7434 | break; |
7435 | ||
045efa82 | 7436 | case offsetof(struct __sk_buff, tc_classid): |
c593642c | 7437 | BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); |
6b8cc1d1 DB |
7438 | |
7439 | off = si->off; | |
7440 | off -= offsetof(struct __sk_buff, tc_classid); | |
7441 | off += offsetof(struct sk_buff, cb); | |
7442 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 7443 | *target_size = 2; |
09c37a2c | 7444 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
7445 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
7446 | si->src_reg, off); | |
09c37a2c | 7447 | else |
6b8cc1d1 DB |
7448 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
7449 | si->src_reg, off); | |
045efa82 DB |
7450 | break; |
7451 | ||
db58ba45 | 7452 | case offsetof(struct __sk_buff, data): |
f035a515 | 7453 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 7454 | si->dst_reg, si->src_reg, |
db58ba45 AS |
7455 | offsetof(struct sk_buff, data)); |
7456 | break; | |
7457 | ||
de8f3a83 DB |
7458 | case offsetof(struct __sk_buff, data_meta): |
7459 | off = si->off; | |
7460 | off -= offsetof(struct __sk_buff, data_meta); | |
7461 | off += offsetof(struct sk_buff, cb); | |
7462 | off += offsetof(struct bpf_skb_data_end, data_meta); | |
7463 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
7464 | si->src_reg, off); | |
7465 | break; | |
7466 | ||
db58ba45 | 7467 | case offsetof(struct __sk_buff, data_end): |
6b8cc1d1 DB |
7468 | off = si->off; |
7469 | off -= offsetof(struct __sk_buff, data_end); | |
7470 | off += offsetof(struct sk_buff, cb); | |
7471 | off += offsetof(struct bpf_skb_data_end, data_end); | |
7472 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
7473 | si->src_reg, off); | |
db58ba45 AS |
7474 | break; |
7475 | ||
d691f9e8 AS |
7476 | case offsetof(struct __sk_buff, tc_index): |
7477 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 7478 | if (type == BPF_WRITE) |
6b8cc1d1 | 7479 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
7480 | bpf_target_off(struct sk_buff, tc_index, 2, |
7481 | target_size)); | |
d691f9e8 | 7482 | else |
6b8cc1d1 | 7483 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
7484 | bpf_target_off(struct sk_buff, tc_index, 2, |
7485 | target_size)); | |
d691f9e8 | 7486 | #else |
2ed46ce4 | 7487 | *target_size = 2; |
d691f9e8 | 7488 | if (type == BPF_WRITE) |
6b8cc1d1 | 7489 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 7490 | else |
6b8cc1d1 | 7491 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
7492 | #endif |
7493 | break; | |
7494 | ||
7495 | case offsetof(struct __sk_buff, napi_id): | |
7496 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 7497 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
7498 | bpf_target_off(struct sk_buff, napi_id, 4, |
7499 | target_size)); | |
b1d9fc41 DB |
7500 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
7501 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
7502 | #else | |
2ed46ce4 | 7503 | *target_size = 4; |
b1d9fc41 | 7504 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 7505 | #endif |
6b8cc1d1 | 7506 | break; |
8a31db56 | 7507 | case offsetof(struct __sk_buff, family): |
c593642c | 7508 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
8a31db56 JF |
7509 | |
7510 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7511 | si->dst_reg, si->src_reg, | |
7512 | offsetof(struct sk_buff, sk)); | |
7513 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7514 | bpf_target_off(struct sock_common, | |
7515 | skc_family, | |
7516 | 2, target_size)); | |
7517 | break; | |
7518 | case offsetof(struct __sk_buff, remote_ip4): | |
c593642c | 7519 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
8a31db56 JF |
7520 | |
7521 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7522 | si->dst_reg, si->src_reg, | |
7523 | offsetof(struct sk_buff, sk)); | |
7524 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7525 | bpf_target_off(struct sock_common, | |
7526 | skc_daddr, | |
7527 | 4, target_size)); | |
7528 | break; | |
7529 | case offsetof(struct __sk_buff, local_ip4): | |
c593642c | 7530 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
8a31db56 JF |
7531 | skc_rcv_saddr) != 4); |
7532 | ||
7533 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7534 | si->dst_reg, si->src_reg, | |
7535 | offsetof(struct sk_buff, sk)); | |
7536 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7537 | bpf_target_off(struct sock_common, | |
7538 | skc_rcv_saddr, | |
7539 | 4, target_size)); | |
7540 | break; | |
7541 | case offsetof(struct __sk_buff, remote_ip6[0]) ... | |
7542 | offsetof(struct __sk_buff, remote_ip6[3]): | |
7543 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 7544 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
8a31db56 JF |
7545 | skc_v6_daddr.s6_addr32[0]) != 4); |
7546 | ||
7547 | off = si->off; | |
7548 | off -= offsetof(struct __sk_buff, remote_ip6[0]); | |
7549 | ||
7550 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7551 | si->dst_reg, si->src_reg, | |
7552 | offsetof(struct sk_buff, sk)); | |
7553 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7554 | offsetof(struct sock_common, | |
7555 | skc_v6_daddr.s6_addr32[0]) + | |
7556 | off); | |
7557 | #else | |
7558 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7559 | #endif | |
7560 | break; | |
7561 | case offsetof(struct __sk_buff, local_ip6[0]) ... | |
7562 | offsetof(struct __sk_buff, local_ip6[3]): | |
7563 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 7564 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
8a31db56 JF |
7565 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
7566 | ||
7567 | off = si->off; | |
7568 | off -= offsetof(struct __sk_buff, local_ip6[0]); | |
7569 | ||
7570 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7571 | si->dst_reg, si->src_reg, | |
7572 | offsetof(struct sk_buff, sk)); | |
7573 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
7574 | offsetof(struct sock_common, | |
7575 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
7576 | off); | |
7577 | #else | |
7578 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7579 | #endif | |
7580 | break; | |
7581 | ||
7582 | case offsetof(struct __sk_buff, remote_port): | |
c593642c | 7583 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
8a31db56 JF |
7584 | |
7585 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7586 | si->dst_reg, si->src_reg, | |
7587 | offsetof(struct sk_buff, sk)); | |
7588 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7589 | bpf_target_off(struct sock_common, | |
7590 | skc_dport, | |
7591 | 2, target_size)); | |
7592 | #ifndef __BIG_ENDIAN_BITFIELD | |
7593 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
7594 | #endif | |
7595 | break; | |
7596 | ||
7597 | case offsetof(struct __sk_buff, local_port): | |
c593642c | 7598 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
8a31db56 JF |
7599 | |
7600 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7601 | si->dst_reg, si->src_reg, | |
7602 | offsetof(struct sk_buff, sk)); | |
7603 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
7604 | bpf_target_off(struct sock_common, | |
7605 | skc_num, 2, target_size)); | |
7606 | break; | |
d58e468b | 7607 | |
f11216b2 | 7608 | case offsetof(struct __sk_buff, tstamp): |
c593642c | 7609 | BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); |
f11216b2 VD |
7610 | |
7611 | if (type == BPF_WRITE) | |
7612 | *insn++ = BPF_STX_MEM(BPF_DW, | |
7613 | si->dst_reg, si->src_reg, | |
7614 | bpf_target_off(struct sk_buff, | |
7615 | tstamp, 8, | |
7616 | target_size)); | |
7617 | else | |
7618 | *insn++ = BPF_LDX_MEM(BPF_DW, | |
7619 | si->dst_reg, si->src_reg, | |
7620 | bpf_target_off(struct sk_buff, | |
7621 | tstamp, 8, | |
7622 | target_size)); | |
e3da08d0 PP |
7623 | break; |
7624 | ||
d9ff286a | 7625 | case offsetof(struct __sk_buff, gso_segs): |
cf62089b | 7626 | insn = bpf_convert_shinfo_access(si, insn); |
d9ff286a ED |
7627 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), |
7628 | si->dst_reg, si->dst_reg, | |
7629 | bpf_target_off(struct skb_shared_info, | |
7630 | gso_segs, 2, | |
7631 | target_size)); | |
7632 | break; | |
cf62089b WB |
7633 | case offsetof(struct __sk_buff, gso_size): |
7634 | insn = bpf_convert_shinfo_access(si, insn); | |
7635 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), | |
7636 | si->dst_reg, si->dst_reg, | |
7637 | bpf_target_off(struct skb_shared_info, | |
7638 | gso_size, 2, | |
7639 | target_size)); | |
7640 | break; | |
e3da08d0 | 7641 | case offsetof(struct __sk_buff, wire_len): |
c593642c | 7642 | BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); |
e3da08d0 PP |
7643 | |
7644 | off = si->off; | |
7645 | off -= offsetof(struct __sk_buff, wire_len); | |
7646 | off += offsetof(struct sk_buff, cb); | |
7647 | off += offsetof(struct qdisc_skb_cb, pkt_len); | |
7648 | *target_size = 4; | |
7649 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); | |
46f8bc92 MKL |
7650 | break; |
7651 | ||
7652 | case offsetof(struct __sk_buff, sk): | |
7653 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
7654 | si->dst_reg, si->src_reg, | |
7655 | offsetof(struct sk_buff, sk)); | |
7656 | break; | |
9bac3d6d AS |
7657 | } |
7658 | ||
7659 | return insn - insn_buf; | |
89aa0758 AS |
7660 | } |
7661 | ||
c64b7983 JS |
7662 | u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, |
7663 | const struct bpf_insn *si, | |
7664 | struct bpf_insn *insn_buf, | |
7665 | struct bpf_prog *prog, u32 *target_size) | |
61023658 DA |
7666 | { |
7667 | struct bpf_insn *insn = insn_buf; | |
aac3fc32 | 7668 | int off; |
61023658 | 7669 | |
6b8cc1d1 | 7670 | switch (si->off) { |
61023658 | 7671 | case offsetof(struct bpf_sock, bound_dev_if): |
c593642c | 7672 | BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); |
61023658 DA |
7673 | |
7674 | if (type == BPF_WRITE) | |
6b8cc1d1 | 7675 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
7676 | offsetof(struct sock, sk_bound_dev_if)); |
7677 | else | |
6b8cc1d1 | 7678 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
7679 | offsetof(struct sock, sk_bound_dev_if)); |
7680 | break; | |
aa4c1037 | 7681 | |
482dca93 | 7682 | case offsetof(struct bpf_sock, mark): |
c593642c | 7683 | BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); |
482dca93 DA |
7684 | |
7685 | if (type == BPF_WRITE) | |
7686 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7687 | offsetof(struct sock, sk_mark)); | |
7688 | else | |
7689 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7690 | offsetof(struct sock, sk_mark)); | |
7691 | break; | |
7692 | ||
7693 | case offsetof(struct bpf_sock, priority): | |
c593642c | 7694 | BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); |
482dca93 DA |
7695 | |
7696 | if (type == BPF_WRITE) | |
7697 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7698 | offsetof(struct sock, sk_priority)); | |
7699 | else | |
7700 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
7701 | offsetof(struct sock, sk_priority)); | |
7702 | break; | |
7703 | ||
aa4c1037 | 7704 | case offsetof(struct bpf_sock, family): |
aa65d696 MKL |
7705 | *insn++ = BPF_LDX_MEM( |
7706 | BPF_FIELD_SIZEOF(struct sock_common, skc_family), | |
7707 | si->dst_reg, si->src_reg, | |
7708 | bpf_target_off(struct sock_common, | |
7709 | skc_family, | |
c593642c | 7710 | sizeof_field(struct sock_common, |
aa65d696 MKL |
7711 | skc_family), |
7712 | target_size)); | |
aa4c1037 DA |
7713 | break; |
7714 | ||
7715 | case offsetof(struct bpf_sock, type): | |
bf976514 MM |
7716 | *insn++ = BPF_LDX_MEM( |
7717 | BPF_FIELD_SIZEOF(struct sock, sk_type), | |
7718 | si->dst_reg, si->src_reg, | |
7719 | bpf_target_off(struct sock, sk_type, | |
7720 | sizeof_field(struct sock, sk_type), | |
7721 | target_size)); | |
aa4c1037 DA |
7722 | break; |
7723 | ||
7724 | case offsetof(struct bpf_sock, protocol): | |
bf976514 MM |
7725 | *insn++ = BPF_LDX_MEM( |
7726 | BPF_FIELD_SIZEOF(struct sock, sk_protocol), | |
7727 | si->dst_reg, si->src_reg, | |
7728 | bpf_target_off(struct sock, sk_protocol, | |
7729 | sizeof_field(struct sock, sk_protocol), | |
7730 | target_size)); | |
aa4c1037 | 7731 | break; |
aac3fc32 AI |
7732 | |
7733 | case offsetof(struct bpf_sock, src_ip4): | |
7734 | *insn++ = BPF_LDX_MEM( | |
7735 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
7736 | bpf_target_off(struct sock_common, skc_rcv_saddr, | |
c593642c | 7737 | sizeof_field(struct sock_common, |
aac3fc32 AI |
7738 | skc_rcv_saddr), |
7739 | target_size)); | |
7740 | break; | |
7741 | ||
aa65d696 MKL |
7742 | case offsetof(struct bpf_sock, dst_ip4): |
7743 | *insn++ = BPF_LDX_MEM( | |
7744 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
7745 | bpf_target_off(struct sock_common, skc_daddr, | |
c593642c | 7746 | sizeof_field(struct sock_common, |
aa65d696 MKL |
7747 | skc_daddr), |
7748 | target_size)); | |
7749 | break; | |
7750 | ||
aac3fc32 AI |
7751 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): |
7752 | #if IS_ENABLED(CONFIG_IPV6) | |
7753 | off = si->off; | |
7754 | off -= offsetof(struct bpf_sock, src_ip6[0]); | |
7755 | *insn++ = BPF_LDX_MEM( | |
7756 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
7757 | bpf_target_off( | |
7758 | struct sock_common, | |
7759 | skc_v6_rcv_saddr.s6_addr32[0], | |
c593642c | 7760 | sizeof_field(struct sock_common, |
aac3fc32 AI |
7761 | skc_v6_rcv_saddr.s6_addr32[0]), |
7762 | target_size) + off); | |
7763 | #else | |
7764 | (void)off; | |
7765 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7766 | #endif | |
7767 | break; | |
7768 | ||
aa65d696 MKL |
7769 | case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): |
7770 | #if IS_ENABLED(CONFIG_IPV6) | |
7771 | off = si->off; | |
7772 | off -= offsetof(struct bpf_sock, dst_ip6[0]); | |
7773 | *insn++ = BPF_LDX_MEM( | |
7774 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
7775 | bpf_target_off(struct sock_common, | |
7776 | skc_v6_daddr.s6_addr32[0], | |
c593642c | 7777 | sizeof_field(struct sock_common, |
aa65d696 MKL |
7778 | skc_v6_daddr.s6_addr32[0]), |
7779 | target_size) + off); | |
7780 | #else | |
7781 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
7782 | *target_size = 4; | |
7783 | #endif | |
7784 | break; | |
7785 | ||
aac3fc32 AI |
7786 | case offsetof(struct bpf_sock, src_port): |
7787 | *insn++ = BPF_LDX_MEM( | |
7788 | BPF_FIELD_SIZEOF(struct sock_common, skc_num), | |
7789 | si->dst_reg, si->src_reg, | |
7790 | bpf_target_off(struct sock_common, skc_num, | |
c593642c | 7791 | sizeof_field(struct sock_common, |
aac3fc32 AI |
7792 | skc_num), |
7793 | target_size)); | |
7794 | break; | |
aa65d696 MKL |
7795 | |
7796 | case offsetof(struct bpf_sock, dst_port): | |
7797 | *insn++ = BPF_LDX_MEM( | |
7798 | BPF_FIELD_SIZEOF(struct sock_common, skc_dport), | |
7799 | si->dst_reg, si->src_reg, | |
7800 | bpf_target_off(struct sock_common, skc_dport, | |
c593642c | 7801 | sizeof_field(struct sock_common, |
aa65d696 MKL |
7802 | skc_dport), |
7803 | target_size)); | |
7804 | break; | |
7805 | ||
7806 | case offsetof(struct bpf_sock, state): | |
7807 | *insn++ = BPF_LDX_MEM( | |
7808 | BPF_FIELD_SIZEOF(struct sock_common, skc_state), | |
7809 | si->dst_reg, si->src_reg, | |
7810 | bpf_target_off(struct sock_common, skc_state, | |
c593642c | 7811 | sizeof_field(struct sock_common, |
aa65d696 MKL |
7812 | skc_state), |
7813 | target_size)); | |
7814 | break; | |
61023658 DA |
7815 | } |
7816 | ||
7817 | return insn - insn_buf; | |
7818 | } | |
7819 | ||
6b8cc1d1 DB |
7820 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
7821 | const struct bpf_insn *si, | |
374fb54e | 7822 | struct bpf_insn *insn_buf, |
f96da094 | 7823 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
7824 | { |
7825 | struct bpf_insn *insn = insn_buf; | |
7826 | ||
6b8cc1d1 | 7827 | switch (si->off) { |
374fb54e | 7828 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 7829 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 7830 | si->dst_reg, si->src_reg, |
374fb54e | 7831 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 7832 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
7833 | bpf_target_off(struct net_device, ifindex, 4, |
7834 | target_size)); | |
374fb54e DB |
7835 | break; |
7836 | default: | |
f96da094 DB |
7837 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
7838 | target_size); | |
374fb54e DB |
7839 | } |
7840 | ||
7841 | return insn - insn_buf; | |
7842 | } | |
7843 | ||
6b8cc1d1 DB |
7844 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
7845 | const struct bpf_insn *si, | |
6a773a15 | 7846 | struct bpf_insn *insn_buf, |
f96da094 | 7847 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
7848 | { |
7849 | struct bpf_insn *insn = insn_buf; | |
7850 | ||
6b8cc1d1 | 7851 | switch (si->off) { |
6a773a15 | 7852 | case offsetof(struct xdp_md, data): |
f035a515 | 7853 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 7854 | si->dst_reg, si->src_reg, |
6a773a15 BB |
7855 | offsetof(struct xdp_buff, data)); |
7856 | break; | |
de8f3a83 DB |
7857 | case offsetof(struct xdp_md, data_meta): |
7858 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), | |
7859 | si->dst_reg, si->src_reg, | |
7860 | offsetof(struct xdp_buff, data_meta)); | |
7861 | break; | |
6a773a15 | 7862 | case offsetof(struct xdp_md, data_end): |
f035a515 | 7863 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 7864 | si->dst_reg, si->src_reg, |
6a773a15 BB |
7865 | offsetof(struct xdp_buff, data_end)); |
7866 | break; | |
02dd3291 JDB |
7867 | case offsetof(struct xdp_md, ingress_ifindex): |
7868 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
7869 | si->dst_reg, si->src_reg, | |
7870 | offsetof(struct xdp_buff, rxq)); | |
7871 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), | |
7872 | si->dst_reg, si->dst_reg, | |
7873 | offsetof(struct xdp_rxq_info, dev)); | |
7874 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 | 7875 | offsetof(struct net_device, ifindex)); |
02dd3291 JDB |
7876 | break; |
7877 | case offsetof(struct xdp_md, rx_queue_index): | |
7878 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
7879 | si->dst_reg, si->src_reg, | |
7880 | offsetof(struct xdp_buff, rxq)); | |
7881 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 JDB |
7882 | offsetof(struct xdp_rxq_info, |
7883 | queue_index)); | |
02dd3291 | 7884 | break; |
6a773a15 BB |
7885 | } |
7886 | ||
7887 | return insn - insn_buf; | |
7888 | } | |
7889 | ||
4fbac77d AI |
7890 | /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of |
7891 | * context Structure, F is Field in context structure that contains a pointer | |
7892 | * to Nested Structure of type NS that has the field NF. | |
7893 | * | |
7894 | * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make | |
7895 | * sure that SIZE is not greater than actual size of S.F.NF. | |
7896 | * | |
7897 | * If offset OFF is provided, the load happens from that offset relative to | |
7898 | * offset of NF. | |
7899 | */ | |
7900 | #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ | |
7901 | do { \ | |
7902 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ | |
7903 | si->src_reg, offsetof(S, F)); \ | |
7904 | *insn++ = BPF_LDX_MEM( \ | |
7905 | SIZE, si->dst_reg, si->dst_reg, \ | |
c593642c | 7906 | bpf_target_off(NS, NF, sizeof_field(NS, NF), \ |
4fbac77d AI |
7907 | target_size) \ |
7908 | + OFF); \ | |
7909 | } while (0) | |
7910 | ||
7911 | #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ | |
7912 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ | |
7913 | BPF_FIELD_SIZEOF(NS, NF), 0) | |
7914 | ||
7915 | /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to | |
7916 | * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. | |
7917 | * | |
4fbac77d AI |
7918 | * In addition it uses Temporary Field TF (member of struct S) as the 3rd |
7919 | * "register" since two registers available in convert_ctx_access are not | |
7920 | * enough: we can't override neither SRC, since it contains value to store, nor | |
7921 | * DST since it contains pointer to context that may be used by later | |
7922 | * instructions. But we need a temporary place to save pointer to nested | |
7923 | * structure whose field we want to store to. | |
7924 | */ | |
600c70ba | 7925 | #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ |
4fbac77d AI |
7926 | do { \ |
7927 | int tmp_reg = BPF_REG_9; \ | |
7928 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
7929 | --tmp_reg; \ | |
7930 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
7931 | --tmp_reg; \ | |
7932 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ | |
7933 | offsetof(S, TF)); \ | |
7934 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ | |
7935 | si->dst_reg, offsetof(S, F)); \ | |
600c70ba | 7936 | *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ |
c593642c | 7937 | bpf_target_off(NS, NF, sizeof_field(NS, NF), \ |
4fbac77d AI |
7938 | target_size) \ |
7939 | + OFF); \ | |
7940 | *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ | |
7941 | offsetof(S, TF)); \ | |
7942 | } while (0) | |
7943 | ||
7944 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ | |
7945 | TF) \ | |
7946 | do { \ | |
7947 | if (type == BPF_WRITE) { \ | |
600c70ba SF |
7948 | SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ |
7949 | OFF, TF); \ | |
4fbac77d AI |
7950 | } else { \ |
7951 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ | |
7952 | S, NS, F, NF, SIZE, OFF); \ | |
7953 | } \ | |
7954 | } while (0) | |
7955 | ||
7956 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ | |
7957 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ | |
7958 | S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) | |
7959 | ||
7960 | static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, | |
7961 | const struct bpf_insn *si, | |
7962 | struct bpf_insn *insn_buf, | |
7963 | struct bpf_prog *prog, u32 *target_size) | |
7964 | { | |
7965 | struct bpf_insn *insn = insn_buf; | |
7966 | int off; | |
7967 | ||
7968 | switch (si->off) { | |
7969 | case offsetof(struct bpf_sock_addr, user_family): | |
7970 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
7971 | struct sockaddr, uaddr, sa_family); | |
7972 | break; | |
7973 | ||
7974 | case offsetof(struct bpf_sock_addr, user_ip4): | |
7975 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
7976 | struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, | |
7977 | sin_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
7978 | break; | |
7979 | ||
7980 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
7981 | off = si->off; | |
7982 | off -= offsetof(struct bpf_sock_addr, user_ip6[0]); | |
7983 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
7984 | struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, | |
7985 | sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, | |
7986 | tmp_reg); | |
7987 | break; | |
7988 | ||
7989 | case offsetof(struct bpf_sock_addr, user_port): | |
7990 | /* To get port we need to know sa_family first and then treat | |
7991 | * sockaddr as either sockaddr_in or sockaddr_in6. | |
7992 | * Though we can simplify since port field has same offset and | |
7993 | * size in both structures. | |
7994 | * Here we check this invariant and use just one of the | |
7995 | * structures if it's true. | |
7996 | */ | |
7997 | BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != | |
7998 | offsetof(struct sockaddr_in6, sin6_port)); | |
c593642c PB |
7999 | BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != |
8000 | sizeof_field(struct sockaddr_in6, sin6_port)); | |
4fbac77d AI |
8001 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, |
8002 | struct sockaddr_in6, uaddr, | |
8003 | sin6_port, tmp_reg); | |
8004 | break; | |
8005 | ||
8006 | case offsetof(struct bpf_sock_addr, family): | |
8007 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
8008 | struct sock, sk, sk_family); | |
8009 | break; | |
8010 | ||
8011 | case offsetof(struct bpf_sock_addr, type): | |
bf976514 MM |
8012 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
8013 | struct sock, sk, sk_type); | |
4fbac77d AI |
8014 | break; |
8015 | ||
8016 | case offsetof(struct bpf_sock_addr, protocol): | |
bf976514 MM |
8017 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
8018 | struct sock, sk, sk_protocol); | |
4fbac77d | 8019 | break; |
1cedee13 AI |
8020 | |
8021 | case offsetof(struct bpf_sock_addr, msg_src_ip4): | |
8022 | /* Treat t_ctx as struct in_addr for msg_src_ip4. */ | |
8023 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
8024 | struct bpf_sock_addr_kern, struct in_addr, t_ctx, | |
8025 | s_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
8026 | break; | |
8027 | ||
8028 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
8029 | msg_src_ip6[3]): | |
8030 | off = si->off; | |
8031 | off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); | |
8032 | /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ | |
8033 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
8034 | struct bpf_sock_addr_kern, struct in6_addr, t_ctx, | |
8035 | s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); | |
8036 | break; | |
fb85c4a7 SF |
8037 | case offsetof(struct bpf_sock_addr, sk): |
8038 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), | |
8039 | si->dst_reg, si->src_reg, | |
8040 | offsetof(struct bpf_sock_addr_kern, sk)); | |
8041 | break; | |
4fbac77d AI |
8042 | } |
8043 | ||
8044 | return insn - insn_buf; | |
8045 | } | |
8046 | ||
40304b2a LB |
8047 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
8048 | const struct bpf_insn *si, | |
8049 | struct bpf_insn *insn_buf, | |
f96da094 DB |
8050 | struct bpf_prog *prog, |
8051 | u32 *target_size) | |
40304b2a LB |
8052 | { |
8053 | struct bpf_insn *insn = insn_buf; | |
8054 | int off; | |
8055 | ||
9b1f3d6e MKL |
8056 | /* Helper macro for adding read access to tcp_sock or sock fields. */ |
8057 | #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
8058 | do { \ | |
c593642c PB |
8059 | BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ |
8060 | sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ | |
9b1f3d6e MKL |
8061 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
8062 | struct bpf_sock_ops_kern, \ | |
8063 | is_fullsock), \ | |
8064 | si->dst_reg, si->src_reg, \ | |
8065 | offsetof(struct bpf_sock_ops_kern, \ | |
8066 | is_fullsock)); \ | |
8067 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ | |
8068 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
8069 | struct bpf_sock_ops_kern, sk),\ | |
8070 | si->dst_reg, si->src_reg, \ | |
8071 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
8072 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ | |
8073 | OBJ_FIELD), \ | |
8074 | si->dst_reg, si->dst_reg, \ | |
8075 | offsetof(OBJ, OBJ_FIELD)); \ | |
8076 | } while (0) | |
8077 | ||
8078 | #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ | |
8079 | SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) | |
8080 | ||
8081 | /* Helper macro for adding write access to tcp_sock or sock fields. | |
8082 | * The macro is called with two registers, dst_reg which contains a pointer | |
8083 | * to ctx (context) and src_reg which contains the value that should be | |
8084 | * stored. However, we need an additional register since we cannot overwrite | |
8085 | * dst_reg because it may be used later in the program. | |
8086 | * Instead we "borrow" one of the other register. We first save its value | |
8087 | * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore | |
8088 | * it at the end of the macro. | |
8089 | */ | |
8090 | #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
8091 | do { \ | |
8092 | int reg = BPF_REG_9; \ | |
c593642c PB |
8093 | BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ |
8094 | sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ | |
9b1f3d6e MKL |
8095 | if (si->dst_reg == reg || si->src_reg == reg) \ |
8096 | reg--; \ | |
8097 | if (si->dst_reg == reg || si->src_reg == reg) \ | |
8098 | reg--; \ | |
8099 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ | |
8100 | offsetof(struct bpf_sock_ops_kern, \ | |
8101 | temp)); \ | |
8102 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
8103 | struct bpf_sock_ops_kern, \ | |
8104 | is_fullsock), \ | |
8105 | reg, si->dst_reg, \ | |
8106 | offsetof(struct bpf_sock_ops_kern, \ | |
8107 | is_fullsock)); \ | |
8108 | *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ | |
8109 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
8110 | struct bpf_sock_ops_kern, sk),\ | |
8111 | reg, si->dst_reg, \ | |
8112 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
8113 | *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ | |
8114 | reg, si->src_reg, \ | |
8115 | offsetof(OBJ, OBJ_FIELD)); \ | |
8116 | *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ | |
8117 | offsetof(struct bpf_sock_ops_kern, \ | |
8118 | temp)); \ | |
8119 | } while (0) | |
8120 | ||
8121 | #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ | |
8122 | do { \ | |
8123 | if (TYPE == BPF_WRITE) \ | |
8124 | SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
8125 | else \ | |
8126 | SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
8127 | } while (0) | |
8128 | ||
9b1f3d6e MKL |
8129 | if (insn > insn_buf) |
8130 | return insn - insn_buf; | |
8131 | ||
40304b2a LB |
8132 | switch (si->off) { |
8133 | case offsetof(struct bpf_sock_ops, op) ... | |
8134 | offsetof(struct bpf_sock_ops, replylong[3]): | |
c593642c PB |
8135 | BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, op) != |
8136 | sizeof_field(struct bpf_sock_ops_kern, op)); | |
8137 | BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != | |
8138 | sizeof_field(struct bpf_sock_ops_kern, reply)); | |
8139 | BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != | |
8140 | sizeof_field(struct bpf_sock_ops_kern, replylong)); | |
40304b2a LB |
8141 | off = si->off; |
8142 | off -= offsetof(struct bpf_sock_ops, op); | |
8143 | off += offsetof(struct bpf_sock_ops_kern, op); | |
8144 | if (type == BPF_WRITE) | |
8145 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
8146 | off); | |
8147 | else | |
8148 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
8149 | off); | |
8150 | break; | |
8151 | ||
8152 | case offsetof(struct bpf_sock_ops, family): | |
c593642c | 8153 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
40304b2a LB |
8154 | |
8155 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8156 | struct bpf_sock_ops_kern, sk), | |
8157 | si->dst_reg, si->src_reg, | |
8158 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8159 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
8160 | offsetof(struct sock_common, skc_family)); | |
8161 | break; | |
8162 | ||
8163 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
c593642c | 8164 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
40304b2a LB |
8165 | |
8166 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8167 | struct bpf_sock_ops_kern, sk), | |
8168 | si->dst_reg, si->src_reg, | |
8169 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8170 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
8171 | offsetof(struct sock_common, skc_daddr)); | |
8172 | break; | |
8173 | ||
8174 | case offsetof(struct bpf_sock_ops, local_ip4): | |
c593642c | 8175 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
303def35 | 8176 | skc_rcv_saddr) != 4); |
40304b2a LB |
8177 | |
8178 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8179 | struct bpf_sock_ops_kern, sk), | |
8180 | si->dst_reg, si->src_reg, | |
8181 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8182 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
8183 | offsetof(struct sock_common, | |
8184 | skc_rcv_saddr)); | |
8185 | break; | |
8186 | ||
8187 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
8188 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
8189 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 8190 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
40304b2a LB |
8191 | skc_v6_daddr.s6_addr32[0]) != 4); |
8192 | ||
8193 | off = si->off; | |
8194 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
8195 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8196 | struct bpf_sock_ops_kern, sk), | |
8197 | si->dst_reg, si->src_reg, | |
8198 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8199 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
8200 | offsetof(struct sock_common, | |
8201 | skc_v6_daddr.s6_addr32[0]) + | |
8202 | off); | |
8203 | #else | |
8204 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
8205 | #endif | |
8206 | break; | |
8207 | ||
8208 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
8209 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
8210 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 8211 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
40304b2a LB |
8212 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
8213 | ||
8214 | off = si->off; | |
8215 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
8216 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8217 | struct bpf_sock_ops_kern, sk), | |
8218 | si->dst_reg, si->src_reg, | |
8219 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8220 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
8221 | offsetof(struct sock_common, | |
8222 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
8223 | off); | |
8224 | #else | |
8225 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
8226 | #endif | |
8227 | break; | |
8228 | ||
8229 | case offsetof(struct bpf_sock_ops, remote_port): | |
c593642c | 8230 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
40304b2a LB |
8231 | |
8232 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8233 | struct bpf_sock_ops_kern, sk), | |
8234 | si->dst_reg, si->src_reg, | |
8235 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8236 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
8237 | offsetof(struct sock_common, skc_dport)); | |
8238 | #ifndef __BIG_ENDIAN_BITFIELD | |
8239 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
8240 | #endif | |
8241 | break; | |
8242 | ||
8243 | case offsetof(struct bpf_sock_ops, local_port): | |
c593642c | 8244 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
40304b2a LB |
8245 | |
8246 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8247 | struct bpf_sock_ops_kern, sk), | |
8248 | si->dst_reg, si->src_reg, | |
8249 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8250 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
8251 | offsetof(struct sock_common, skc_num)); | |
8252 | break; | |
f19397a5 LB |
8253 | |
8254 | case offsetof(struct bpf_sock_ops, is_fullsock): | |
8255 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8256 | struct bpf_sock_ops_kern, | |
8257 | is_fullsock), | |
8258 | si->dst_reg, si->src_reg, | |
8259 | offsetof(struct bpf_sock_ops_kern, | |
8260 | is_fullsock)); | |
8261 | break; | |
8262 | ||
44f0e430 | 8263 | case offsetof(struct bpf_sock_ops, state): |
c593642c | 8264 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); |
44f0e430 LB |
8265 | |
8266 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8267 | struct bpf_sock_ops_kern, sk), | |
8268 | si->dst_reg, si->src_reg, | |
8269 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8270 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, | |
8271 | offsetof(struct sock_common, skc_state)); | |
8272 | break; | |
8273 | ||
8274 | case offsetof(struct bpf_sock_ops, rtt_min): | |
c593642c | 8275 | BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != |
44f0e430 LB |
8276 | sizeof(struct minmax)); |
8277 | BUILD_BUG_ON(sizeof(struct minmax) < | |
8278 | sizeof(struct minmax_sample)); | |
8279 | ||
8280 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8281 | struct bpf_sock_ops_kern, sk), | |
8282 | si->dst_reg, si->src_reg, | |
8283 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8284 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
8285 | offsetof(struct tcp_sock, rtt_min) + | |
c593642c | 8286 | sizeof_field(struct minmax_sample, t)); |
44f0e430 LB |
8287 | break; |
8288 | ||
b13d8807 LB |
8289 | case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): |
8290 | SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, | |
8291 | struct tcp_sock); | |
8292 | break; | |
44f0e430 | 8293 | |
44f0e430 | 8294 | case offsetof(struct bpf_sock_ops, sk_txhash): |
6f9bd3d7 LB |
8295 | SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, |
8296 | struct sock, type); | |
44f0e430 | 8297 | break; |
2377b81d SF |
8298 | case offsetof(struct bpf_sock_ops, snd_cwnd): |
8299 | SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); | |
8300 | break; | |
8301 | case offsetof(struct bpf_sock_ops, srtt_us): | |
8302 | SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); | |
8303 | break; | |
8304 | case offsetof(struct bpf_sock_ops, snd_ssthresh): | |
8305 | SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); | |
8306 | break; | |
8307 | case offsetof(struct bpf_sock_ops, rcv_nxt): | |
8308 | SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); | |
8309 | break; | |
8310 | case offsetof(struct bpf_sock_ops, snd_nxt): | |
8311 | SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); | |
8312 | break; | |
8313 | case offsetof(struct bpf_sock_ops, snd_una): | |
8314 | SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); | |
8315 | break; | |
8316 | case offsetof(struct bpf_sock_ops, mss_cache): | |
8317 | SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); | |
8318 | break; | |
8319 | case offsetof(struct bpf_sock_ops, ecn_flags): | |
8320 | SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); | |
8321 | break; | |
8322 | case offsetof(struct bpf_sock_ops, rate_delivered): | |
8323 | SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); | |
8324 | break; | |
8325 | case offsetof(struct bpf_sock_ops, rate_interval_us): | |
8326 | SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); | |
8327 | break; | |
8328 | case offsetof(struct bpf_sock_ops, packets_out): | |
8329 | SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); | |
8330 | break; | |
8331 | case offsetof(struct bpf_sock_ops, retrans_out): | |
8332 | SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); | |
8333 | break; | |
8334 | case offsetof(struct bpf_sock_ops, total_retrans): | |
8335 | SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); | |
8336 | break; | |
8337 | case offsetof(struct bpf_sock_ops, segs_in): | |
8338 | SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); | |
8339 | break; | |
8340 | case offsetof(struct bpf_sock_ops, data_segs_in): | |
8341 | SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); | |
8342 | break; | |
8343 | case offsetof(struct bpf_sock_ops, segs_out): | |
8344 | SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); | |
8345 | break; | |
8346 | case offsetof(struct bpf_sock_ops, data_segs_out): | |
8347 | SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); | |
8348 | break; | |
8349 | case offsetof(struct bpf_sock_ops, lost_out): | |
8350 | SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); | |
8351 | break; | |
8352 | case offsetof(struct bpf_sock_ops, sacked_out): | |
8353 | SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); | |
8354 | break; | |
8355 | case offsetof(struct bpf_sock_ops, bytes_received): | |
8356 | SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); | |
8357 | break; | |
8358 | case offsetof(struct bpf_sock_ops, bytes_acked): | |
8359 | SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); | |
8360 | break; | |
1314ef56 SF |
8361 | case offsetof(struct bpf_sock_ops, sk): |
8362 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8363 | struct bpf_sock_ops_kern, | |
8364 | is_fullsock), | |
8365 | si->dst_reg, si->src_reg, | |
8366 | offsetof(struct bpf_sock_ops_kern, | |
8367 | is_fullsock)); | |
8368 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); | |
8369 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
8370 | struct bpf_sock_ops_kern, sk), | |
8371 | si->dst_reg, si->src_reg, | |
8372 | offsetof(struct bpf_sock_ops_kern, sk)); | |
8373 | break; | |
40304b2a LB |
8374 | } |
8375 | return insn - insn_buf; | |
8376 | } | |
8377 | ||
8108a775 JF |
8378 | static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, |
8379 | const struct bpf_insn *si, | |
8380 | struct bpf_insn *insn_buf, | |
8381 | struct bpf_prog *prog, u32 *target_size) | |
8382 | { | |
8383 | struct bpf_insn *insn = insn_buf; | |
8384 | int off; | |
8385 | ||
8386 | switch (si->off) { | |
8387 | case offsetof(struct __sk_buff, data_end): | |
8388 | off = si->off; | |
8389 | off -= offsetof(struct __sk_buff, data_end); | |
8390 | off += offsetof(struct sk_buff, cb); | |
8391 | off += offsetof(struct tcp_skb_cb, bpf.data_end); | |
8392 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
8393 | si->src_reg, off); | |
8394 | break; | |
8395 | default: | |
8396 | return bpf_convert_ctx_access(type, si, insn_buf, prog, | |
8397 | target_size); | |
8398 | } | |
8399 | ||
8400 | return insn - insn_buf; | |
8401 | } | |
8402 | ||
4f738adb JF |
8403 | static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, |
8404 | const struct bpf_insn *si, | |
8405 | struct bpf_insn *insn_buf, | |
8406 | struct bpf_prog *prog, u32 *target_size) | |
8407 | { | |
8408 | struct bpf_insn *insn = insn_buf; | |
720e7f38 | 8409 | #if IS_ENABLED(CONFIG_IPV6) |
303def35 | 8410 | int off; |
720e7f38 | 8411 | #endif |
4f738adb | 8412 | |
7a69c0f2 JF |
8413 | /* convert ctx uses the fact sg element is first in struct */ |
8414 | BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); | |
8415 | ||
4f738adb JF |
8416 | switch (si->off) { |
8417 | case offsetof(struct sk_msg_md, data): | |
604326b4 | 8418 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), |
4f738adb | 8419 | si->dst_reg, si->src_reg, |
604326b4 | 8420 | offsetof(struct sk_msg, data)); |
4f738adb JF |
8421 | break; |
8422 | case offsetof(struct sk_msg_md, data_end): | |
604326b4 | 8423 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), |
4f738adb | 8424 | si->dst_reg, si->src_reg, |
604326b4 | 8425 | offsetof(struct sk_msg, data_end)); |
4f738adb | 8426 | break; |
303def35 | 8427 | case offsetof(struct sk_msg_md, family): |
c593642c | 8428 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
303def35 JF |
8429 | |
8430 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8431 | struct sk_msg, sk), |
303def35 | 8432 | si->dst_reg, si->src_reg, |
604326b4 | 8433 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8434 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
8435 | offsetof(struct sock_common, skc_family)); | |
8436 | break; | |
8437 | ||
8438 | case offsetof(struct sk_msg_md, remote_ip4): | |
c593642c | 8439 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
303def35 JF |
8440 | |
8441 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8442 | struct sk_msg, sk), |
303def35 | 8443 | si->dst_reg, si->src_reg, |
604326b4 | 8444 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8445 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
8446 | offsetof(struct sock_common, skc_daddr)); | |
8447 | break; | |
8448 | ||
8449 | case offsetof(struct sk_msg_md, local_ip4): | |
c593642c | 8450 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
303def35 JF |
8451 | skc_rcv_saddr) != 4); |
8452 | ||
8453 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8454 | struct sk_msg, sk), |
303def35 | 8455 | si->dst_reg, si->src_reg, |
604326b4 | 8456 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8457 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
8458 | offsetof(struct sock_common, | |
8459 | skc_rcv_saddr)); | |
8460 | break; | |
8461 | ||
8462 | case offsetof(struct sk_msg_md, remote_ip6[0]) ... | |
8463 | offsetof(struct sk_msg_md, remote_ip6[3]): | |
8464 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 8465 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
303def35 JF |
8466 | skc_v6_daddr.s6_addr32[0]) != 4); |
8467 | ||
8468 | off = si->off; | |
8469 | off -= offsetof(struct sk_msg_md, remote_ip6[0]); | |
8470 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8471 | struct sk_msg, sk), |
303def35 | 8472 | si->dst_reg, si->src_reg, |
604326b4 | 8473 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8474 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
8475 | offsetof(struct sock_common, | |
8476 | skc_v6_daddr.s6_addr32[0]) + | |
8477 | off); | |
8478 | #else | |
8479 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
8480 | #endif | |
8481 | break; | |
8482 | ||
8483 | case offsetof(struct sk_msg_md, local_ip6[0]) ... | |
8484 | offsetof(struct sk_msg_md, local_ip6[3]): | |
8485 | #if IS_ENABLED(CONFIG_IPV6) | |
c593642c | 8486 | BUILD_BUG_ON(sizeof_field(struct sock_common, |
303def35 JF |
8487 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
8488 | ||
8489 | off = si->off; | |
8490 | off -= offsetof(struct sk_msg_md, local_ip6[0]); | |
8491 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8492 | struct sk_msg, sk), |
303def35 | 8493 | si->dst_reg, si->src_reg, |
604326b4 | 8494 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8495 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
8496 | offsetof(struct sock_common, | |
8497 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
8498 | off); | |
8499 | #else | |
8500 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
8501 | #endif | |
8502 | break; | |
8503 | ||
8504 | case offsetof(struct sk_msg_md, remote_port): | |
c593642c | 8505 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
303def35 JF |
8506 | |
8507 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8508 | struct sk_msg, sk), |
303def35 | 8509 | si->dst_reg, si->src_reg, |
604326b4 | 8510 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8511 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
8512 | offsetof(struct sock_common, skc_dport)); | |
8513 | #ifndef __BIG_ENDIAN_BITFIELD | |
8514 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
8515 | #endif | |
8516 | break; | |
8517 | ||
8518 | case offsetof(struct sk_msg_md, local_port): | |
c593642c | 8519 | BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
303def35 JF |
8520 | |
8521 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
604326b4 | 8522 | struct sk_msg, sk), |
303def35 | 8523 | si->dst_reg, si->src_reg, |
604326b4 | 8524 | offsetof(struct sk_msg, sk)); |
303def35 JF |
8525 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
8526 | offsetof(struct sock_common, skc_num)); | |
8527 | break; | |
3bdbd022 JF |
8528 | |
8529 | case offsetof(struct sk_msg_md, size): | |
8530 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), | |
8531 | si->dst_reg, si->src_reg, | |
8532 | offsetof(struct sk_msg_sg, size)); | |
8533 | break; | |
4f738adb JF |
8534 | } |
8535 | ||
8536 | return insn - insn_buf; | |
8537 | } | |
8538 | ||
7de16e3a | 8539 | const struct bpf_verifier_ops sk_filter_verifier_ops = { |
4936e352 DB |
8540 | .get_func_proto = sk_filter_func_proto, |
8541 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 8542 | .convert_ctx_access = bpf_convert_ctx_access, |
e0cea7ce | 8543 | .gen_ld_abs = bpf_gen_ld_abs, |
89aa0758 AS |
8544 | }; |
8545 | ||
7de16e3a | 8546 | const struct bpf_prog_ops sk_filter_prog_ops = { |
61f3c964 | 8547 | .test_run = bpf_prog_test_run_skb, |
7de16e3a JK |
8548 | }; |
8549 | ||
8550 | const struct bpf_verifier_ops tc_cls_act_verifier_ops = { | |
4936e352 DB |
8551 | .get_func_proto = tc_cls_act_func_proto, |
8552 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 8553 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 8554 | .gen_prologue = tc_cls_act_prologue, |
e0cea7ce | 8555 | .gen_ld_abs = bpf_gen_ld_abs, |
7de16e3a JK |
8556 | }; |
8557 | ||
8558 | const struct bpf_prog_ops tc_cls_act_prog_ops = { | |
1cf1cae9 | 8559 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
8560 | }; |
8561 | ||
7de16e3a | 8562 | const struct bpf_verifier_ops xdp_verifier_ops = { |
6a773a15 BB |
8563 | .get_func_proto = xdp_func_proto, |
8564 | .is_valid_access = xdp_is_valid_access, | |
8565 | .convert_ctx_access = xdp_convert_ctx_access, | |
b09928b9 | 8566 | .gen_prologue = bpf_noop_prologue, |
7de16e3a JK |
8567 | }; |
8568 | ||
8569 | const struct bpf_prog_ops xdp_prog_ops = { | |
1cf1cae9 | 8570 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
8571 | }; |
8572 | ||
7de16e3a | 8573 | const struct bpf_verifier_ops cg_skb_verifier_ops = { |
cd339431 | 8574 | .get_func_proto = cg_skb_func_proto, |
b39b5f41 | 8575 | .is_valid_access = cg_skb_is_valid_access, |
2492d3b8 | 8576 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
8577 | }; |
8578 | ||
8579 | const struct bpf_prog_ops cg_skb_prog_ops = { | |
1cf1cae9 | 8580 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
8581 | }; |
8582 | ||
cd3092c7 MX |
8583 | const struct bpf_verifier_ops lwt_in_verifier_ops = { |
8584 | .get_func_proto = lwt_in_func_proto, | |
3a0af8fd | 8585 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 8586 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
8587 | }; |
8588 | ||
cd3092c7 MX |
8589 | const struct bpf_prog_ops lwt_in_prog_ops = { |
8590 | .test_run = bpf_prog_test_run_skb, | |
8591 | }; | |
8592 | ||
8593 | const struct bpf_verifier_ops lwt_out_verifier_ops = { | |
8594 | .get_func_proto = lwt_out_func_proto, | |
3a0af8fd | 8595 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 8596 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
8597 | }; |
8598 | ||
cd3092c7 | 8599 | const struct bpf_prog_ops lwt_out_prog_ops = { |
1cf1cae9 | 8600 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
8601 | }; |
8602 | ||
7de16e3a | 8603 | const struct bpf_verifier_ops lwt_xmit_verifier_ops = { |
3a0af8fd TG |
8604 | .get_func_proto = lwt_xmit_func_proto, |
8605 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 8606 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 8607 | .gen_prologue = tc_cls_act_prologue, |
7de16e3a JK |
8608 | }; |
8609 | ||
8610 | const struct bpf_prog_ops lwt_xmit_prog_ops = { | |
1cf1cae9 | 8611 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
8612 | }; |
8613 | ||
004d4b27 MX |
8614 | const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { |
8615 | .get_func_proto = lwt_seg6local_func_proto, | |
8616 | .is_valid_access = lwt_is_valid_access, | |
8617 | .convert_ctx_access = bpf_convert_ctx_access, | |
8618 | }; | |
8619 | ||
8620 | const struct bpf_prog_ops lwt_seg6local_prog_ops = { | |
8621 | .test_run = bpf_prog_test_run_skb, | |
8622 | }; | |
8623 | ||
7de16e3a | 8624 | const struct bpf_verifier_ops cg_sock_verifier_ops = { |
ae2cf1c4 | 8625 | .get_func_proto = sock_filter_func_proto, |
61023658 | 8626 | .is_valid_access = sock_filter_is_valid_access, |
c64b7983 | 8627 | .convert_ctx_access = bpf_sock_convert_ctx_access, |
61023658 DA |
8628 | }; |
8629 | ||
7de16e3a JK |
8630 | const struct bpf_prog_ops cg_sock_prog_ops = { |
8631 | }; | |
8632 | ||
4fbac77d AI |
8633 | const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { |
8634 | .get_func_proto = sock_addr_func_proto, | |
8635 | .is_valid_access = sock_addr_is_valid_access, | |
8636 | .convert_ctx_access = sock_addr_convert_ctx_access, | |
8637 | }; | |
8638 | ||
8639 | const struct bpf_prog_ops cg_sock_addr_prog_ops = { | |
8640 | }; | |
8641 | ||
7de16e3a | 8642 | const struct bpf_verifier_ops sock_ops_verifier_ops = { |
8c4b4c7e | 8643 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
8644 | .is_valid_access = sock_ops_is_valid_access, |
8645 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
8646 | }; | |
8647 | ||
7de16e3a JK |
8648 | const struct bpf_prog_ops sock_ops_prog_ops = { |
8649 | }; | |
8650 | ||
8651 | const struct bpf_verifier_ops sk_skb_verifier_ops = { | |
b005fd18 JF |
8652 | .get_func_proto = sk_skb_func_proto, |
8653 | .is_valid_access = sk_skb_is_valid_access, | |
8108a775 | 8654 | .convert_ctx_access = sk_skb_convert_ctx_access, |
8a31db56 | 8655 | .gen_prologue = sk_skb_prologue, |
b005fd18 JF |
8656 | }; |
8657 | ||
7de16e3a JK |
8658 | const struct bpf_prog_ops sk_skb_prog_ops = { |
8659 | }; | |
8660 | ||
4f738adb JF |
8661 | const struct bpf_verifier_ops sk_msg_verifier_ops = { |
8662 | .get_func_proto = sk_msg_func_proto, | |
8663 | .is_valid_access = sk_msg_is_valid_access, | |
8664 | .convert_ctx_access = sk_msg_convert_ctx_access, | |
b09928b9 | 8665 | .gen_prologue = bpf_noop_prologue, |
4f738adb JF |
8666 | }; |
8667 | ||
8668 | const struct bpf_prog_ops sk_msg_prog_ops = { | |
8669 | }; | |
8670 | ||
d58e468b PP |
8671 | const struct bpf_verifier_ops flow_dissector_verifier_ops = { |
8672 | .get_func_proto = flow_dissector_func_proto, | |
8673 | .is_valid_access = flow_dissector_is_valid_access, | |
089b19a9 | 8674 | .convert_ctx_access = flow_dissector_convert_ctx_access, |
d58e468b PP |
8675 | }; |
8676 | ||
8677 | const struct bpf_prog_ops flow_dissector_prog_ops = { | |
b7a1848e | 8678 | .test_run = bpf_prog_test_run_flow_dissector, |
d58e468b PP |
8679 | }; |
8680 | ||
8ced425e | 8681 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
8682 | { |
8683 | int ret = -ENOENT; | |
8684 | struct sk_filter *filter; | |
8685 | ||
d59577b6 VB |
8686 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
8687 | return -EPERM; | |
8688 | ||
8ced425e HFS |
8689 | filter = rcu_dereference_protected(sk->sk_filter, |
8690 | lockdep_sock_is_held(sk)); | |
55b33325 | 8691 | if (filter) { |
a9b3cd7f | 8692 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 8693 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
8694 | ret = 0; |
8695 | } | |
a3ea269b | 8696 | |
55b33325 PE |
8697 | return ret; |
8698 | } | |
8ced425e | 8699 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 8700 | |
a3ea269b DB |
8701 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
8702 | unsigned int len) | |
a8fc9277 | 8703 | { |
a3ea269b | 8704 | struct sock_fprog_kern *fprog; |
a8fc9277 | 8705 | struct sk_filter *filter; |
a3ea269b | 8706 | int ret = 0; |
a8fc9277 PE |
8707 | |
8708 | lock_sock(sk); | |
8709 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 8710 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
8711 | if (!filter) |
8712 | goto out; | |
a3ea269b DB |
8713 | |
8714 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
8715 | * so no conversion/decode needed anymore. eBPF programs that |
8716 | * have no original program cannot be dumped through this. | |
a3ea269b | 8717 | */ |
93d08b69 | 8718 | ret = -EACCES; |
7ae457c1 | 8719 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
8720 | if (!fprog) |
8721 | goto out; | |
a3ea269b DB |
8722 | |
8723 | ret = fprog->len; | |
a8fc9277 | 8724 | if (!len) |
a3ea269b | 8725 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 8726 | goto out; |
a3ea269b | 8727 | |
a8fc9277 | 8728 | ret = -EINVAL; |
a3ea269b | 8729 | if (len < fprog->len) |
a8fc9277 PE |
8730 | goto out; |
8731 | ||
8732 | ret = -EFAULT; | |
009937e7 | 8733 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 8734 | goto out; |
a8fc9277 | 8735 | |
a3ea269b DB |
8736 | /* Instead of bytes, the API requests to return the number |
8737 | * of filter blocks. | |
8738 | */ | |
8739 | ret = fprog->len; | |
a8fc9277 PE |
8740 | out: |
8741 | release_sock(sk); | |
8742 | return ret; | |
8743 | } | |
2dbb9b9e MKL |
8744 | |
8745 | #ifdef CONFIG_INET | |
2dbb9b9e MKL |
8746 | static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, |
8747 | struct sock_reuseport *reuse, | |
8748 | struct sock *sk, struct sk_buff *skb, | |
8749 | u32 hash) | |
8750 | { | |
8751 | reuse_kern->skb = skb; | |
8752 | reuse_kern->sk = sk; | |
8753 | reuse_kern->selected_sk = NULL; | |
8754 | reuse_kern->data_end = skb->data + skb_headlen(skb); | |
8755 | reuse_kern->hash = hash; | |
8756 | reuse_kern->reuseport_id = reuse->reuseport_id; | |
8757 | reuse_kern->bind_inany = reuse->bind_inany; | |
8758 | } | |
8759 | ||
8760 | struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, | |
8761 | struct bpf_prog *prog, struct sk_buff *skb, | |
8762 | u32 hash) | |
8763 | { | |
8764 | struct sk_reuseport_kern reuse_kern; | |
8765 | enum sk_action action; | |
8766 | ||
8767 | bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); | |
8768 | action = BPF_PROG_RUN(prog, &reuse_kern); | |
8769 | ||
8770 | if (action == SK_PASS) | |
8771 | return reuse_kern.selected_sk; | |
8772 | else | |
8773 | return ERR_PTR(-ECONNREFUSED); | |
8774 | } | |
8775 | ||
8776 | BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, | |
8777 | struct bpf_map *, map, void *, key, u32, flags) | |
8778 | { | |
9fed9000 | 8779 | bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; |
2dbb9b9e MKL |
8780 | struct sock_reuseport *reuse; |
8781 | struct sock *selected_sk; | |
8782 | ||
8783 | selected_sk = map->ops->map_lookup_elem(map, key); | |
8784 | if (!selected_sk) | |
8785 | return -ENOENT; | |
8786 | ||
8787 | reuse = rcu_dereference(selected_sk->sk_reuseport_cb); | |
9fed9000 JS |
8788 | if (!reuse) { |
8789 | /* reuseport_array has only sk with non NULL sk_reuseport_cb. | |
8790 | * The only (!reuse) case here is - the sk has already been | |
8791 | * unhashed (e.g. by close()), so treat it as -ENOENT. | |
8792 | * | |
8793 | * Other maps (e.g. sock_map) do not provide this guarantee and | |
8794 | * the sk may never be in the reuseport group to begin with. | |
2dbb9b9e | 8795 | */ |
9fed9000 JS |
8796 | return is_sockarray ? -ENOENT : -EINVAL; |
8797 | } | |
2dbb9b9e MKL |
8798 | |
8799 | if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { | |
035ff358 | 8800 | struct sock *sk = reuse_kern->sk; |
2dbb9b9e | 8801 | |
2dbb9b9e MKL |
8802 | if (sk->sk_protocol != selected_sk->sk_protocol) |
8803 | return -EPROTOTYPE; | |
8804 | else if (sk->sk_family != selected_sk->sk_family) | |
8805 | return -EAFNOSUPPORT; | |
8806 | ||
8807 | /* Catch all. Likely bound to a different sockaddr. */ | |
8808 | return -EBADFD; | |
8809 | } | |
8810 | ||
8811 | reuse_kern->selected_sk = selected_sk; | |
8812 | ||
8813 | return 0; | |
8814 | } | |
8815 | ||
8816 | static const struct bpf_func_proto sk_select_reuseport_proto = { | |
8817 | .func = sk_select_reuseport, | |
8818 | .gpl_only = false, | |
8819 | .ret_type = RET_INTEGER, | |
8820 | .arg1_type = ARG_PTR_TO_CTX, | |
8821 | .arg2_type = ARG_CONST_MAP_PTR, | |
8822 | .arg3_type = ARG_PTR_TO_MAP_KEY, | |
8823 | .arg4_type = ARG_ANYTHING, | |
8824 | }; | |
8825 | ||
8826 | BPF_CALL_4(sk_reuseport_load_bytes, | |
8827 | const struct sk_reuseport_kern *, reuse_kern, u32, offset, | |
8828 | void *, to, u32, len) | |
8829 | { | |
8830 | return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); | |
8831 | } | |
8832 | ||
8833 | static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { | |
8834 | .func = sk_reuseport_load_bytes, | |
8835 | .gpl_only = false, | |
8836 | .ret_type = RET_INTEGER, | |
8837 | .arg1_type = ARG_PTR_TO_CTX, | |
8838 | .arg2_type = ARG_ANYTHING, | |
8839 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
8840 | .arg4_type = ARG_CONST_SIZE, | |
8841 | }; | |
8842 | ||
8843 | BPF_CALL_5(sk_reuseport_load_bytes_relative, | |
8844 | const struct sk_reuseport_kern *, reuse_kern, u32, offset, | |
8845 | void *, to, u32, len, u32, start_header) | |
8846 | { | |
8847 | return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, | |
8848 | len, start_header); | |
8849 | } | |
8850 | ||
8851 | static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { | |
8852 | .func = sk_reuseport_load_bytes_relative, | |
8853 | .gpl_only = false, | |
8854 | .ret_type = RET_INTEGER, | |
8855 | .arg1_type = ARG_PTR_TO_CTX, | |
8856 | .arg2_type = ARG_ANYTHING, | |
8857 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
8858 | .arg4_type = ARG_CONST_SIZE, | |
8859 | .arg5_type = ARG_ANYTHING, | |
8860 | }; | |
8861 | ||
8862 | static const struct bpf_func_proto * | |
8863 | sk_reuseport_func_proto(enum bpf_func_id func_id, | |
8864 | const struct bpf_prog *prog) | |
8865 | { | |
8866 | switch (func_id) { | |
8867 | case BPF_FUNC_sk_select_reuseport: | |
8868 | return &sk_select_reuseport_proto; | |
8869 | case BPF_FUNC_skb_load_bytes: | |
8870 | return &sk_reuseport_load_bytes_proto; | |
8871 | case BPF_FUNC_skb_load_bytes_relative: | |
8872 | return &sk_reuseport_load_bytes_relative_proto; | |
8873 | default: | |
8874 | return bpf_base_func_proto(func_id); | |
8875 | } | |
8876 | } | |
8877 | ||
8878 | static bool | |
8879 | sk_reuseport_is_valid_access(int off, int size, | |
8880 | enum bpf_access_type type, | |
8881 | const struct bpf_prog *prog, | |
8882 | struct bpf_insn_access_aux *info) | |
8883 | { | |
8884 | const u32 size_default = sizeof(__u32); | |
8885 | ||
8886 | if (off < 0 || off >= sizeof(struct sk_reuseport_md) || | |
8887 | off % size || type != BPF_READ) | |
8888 | return false; | |
8889 | ||
8890 | switch (off) { | |
8891 | case offsetof(struct sk_reuseport_md, data): | |
8892 | info->reg_type = PTR_TO_PACKET; | |
8893 | return size == sizeof(__u64); | |
8894 | ||
8895 | case offsetof(struct sk_reuseport_md, data_end): | |
8896 | info->reg_type = PTR_TO_PACKET_END; | |
8897 | return size == sizeof(__u64); | |
8898 | ||
8899 | case offsetof(struct sk_reuseport_md, hash): | |
8900 | return size == size_default; | |
8901 | ||
8902 | /* Fields that allow narrowing */ | |
2c238177 | 8903 | case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): |
c593642c | 8904 | if (size < sizeof_field(struct sk_buff, protocol)) |
2dbb9b9e | 8905 | return false; |
4597b62f | 8906 | /* fall through */ |
2c238177 IL |
8907 | case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): |
8908 | case bpf_ctx_range(struct sk_reuseport_md, bind_inany): | |
8909 | case bpf_ctx_range(struct sk_reuseport_md, len): | |
2dbb9b9e MKL |
8910 | bpf_ctx_record_field_size(info, size_default); |
8911 | return bpf_ctx_narrow_access_ok(off, size, size_default); | |
8912 | ||
8913 | default: | |
8914 | return false; | |
8915 | } | |
8916 | } | |
8917 | ||
8918 | #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ | |
8919 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ | |
8920 | si->dst_reg, si->src_reg, \ | |
8921 | bpf_target_off(struct sk_reuseport_kern, F, \ | |
c593642c | 8922 | sizeof_field(struct sk_reuseport_kern, F), \ |
2dbb9b9e MKL |
8923 | target_size)); \ |
8924 | }) | |
8925 | ||
8926 | #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ | |
8927 | SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ | |
8928 | struct sk_buff, \ | |
8929 | skb, \ | |
8930 | SKB_FIELD) | |
8931 | ||
bf976514 MM |
8932 | #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ |
8933 | SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ | |
8934 | struct sock, \ | |
8935 | sk, \ | |
8936 | SK_FIELD) | |
2dbb9b9e MKL |
8937 | |
8938 | static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, | |
8939 | const struct bpf_insn *si, | |
8940 | struct bpf_insn *insn_buf, | |
8941 | struct bpf_prog *prog, | |
8942 | u32 *target_size) | |
8943 | { | |
8944 | struct bpf_insn *insn = insn_buf; | |
8945 | ||
8946 | switch (si->off) { | |
8947 | case offsetof(struct sk_reuseport_md, data): | |
8948 | SK_REUSEPORT_LOAD_SKB_FIELD(data); | |
8949 | break; | |
8950 | ||
8951 | case offsetof(struct sk_reuseport_md, len): | |
8952 | SK_REUSEPORT_LOAD_SKB_FIELD(len); | |
8953 | break; | |
8954 | ||
8955 | case offsetof(struct sk_reuseport_md, eth_protocol): | |
8956 | SK_REUSEPORT_LOAD_SKB_FIELD(protocol); | |
8957 | break; | |
8958 | ||
8959 | case offsetof(struct sk_reuseport_md, ip_protocol): | |
bf976514 | 8960 | SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); |
2dbb9b9e MKL |
8961 | break; |
8962 | ||
8963 | case offsetof(struct sk_reuseport_md, data_end): | |
8964 | SK_REUSEPORT_LOAD_FIELD(data_end); | |
8965 | break; | |
8966 | ||
8967 | case offsetof(struct sk_reuseport_md, hash): | |
8968 | SK_REUSEPORT_LOAD_FIELD(hash); | |
8969 | break; | |
8970 | ||
8971 | case offsetof(struct sk_reuseport_md, bind_inany): | |
8972 | SK_REUSEPORT_LOAD_FIELD(bind_inany); | |
8973 | break; | |
8974 | } | |
8975 | ||
8976 | return insn - insn_buf; | |
8977 | } | |
8978 | ||
8979 | const struct bpf_verifier_ops sk_reuseport_verifier_ops = { | |
8980 | .get_func_proto = sk_reuseport_func_proto, | |
8981 | .is_valid_access = sk_reuseport_is_valid_access, | |
8982 | .convert_ctx_access = sk_reuseport_convert_ctx_access, | |
8983 | }; | |
8984 | ||
8985 | const struct bpf_prog_ops sk_reuseport_prog_ops = { | |
8986 | }; | |
8987 | #endif /* CONFIG_INET */ | |
7e6897f9 | 8988 | |
6a64037d | 8989 | DEFINE_BPF_DISPATCHER(xdp) |
7e6897f9 BT |
8990 | |
8991 | void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) | |
8992 | { | |
6a64037d | 8993 | bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); |
7e6897f9 | 8994 | } |