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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux Socket Filter - Kernel level socket filtering | |
3 | * | |
bd4cf0ed AS |
4 | * Based on the design of the Berkeley Packet Filter. The new |
5 | * internal format has been designed by PLUMgrid: | |
1da177e4 | 6 | * |
bd4cf0ed AS |
7 | * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com |
8 | * | |
9 | * Authors: | |
10 | * | |
11 | * Jay Schulist <jschlst@samba.org> | |
12 | * Alexei Starovoitov <ast@plumgrid.com> | |
13 | * Daniel Borkmann <dborkman@redhat.com> | |
1da177e4 LT |
14 | * |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
20 | * Andi Kleen - Fix a few bad bugs and races. | |
4df95ff4 | 21 | * Kris Katterjohn - Added many additional checks in bpf_check_classic() |
1da177e4 LT |
22 | */ |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/types.h> | |
1da177e4 LT |
26 | #include <linux/mm.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/socket.h> | |
91b8270f | 29 | #include <linux/sock_diag.h> |
1da177e4 LT |
30 | #include <linux/in.h> |
31 | #include <linux/inet.h> | |
32 | #include <linux/netdevice.h> | |
33 | #include <linux/if_packet.h> | |
c491680f | 34 | #include <linux/if_arp.h> |
5a0e3ad6 | 35 | #include <linux/gfp.h> |
d74bad4e | 36 | #include <net/inet_common.h> |
1da177e4 LT |
37 | #include <net/ip.h> |
38 | #include <net/protocol.h> | |
4738c1db | 39 | #include <net/netlink.h> |
1da177e4 LT |
40 | #include <linux/skbuff.h> |
41 | #include <net/sock.h> | |
10b89ee4 | 42 | #include <net/flow_dissector.h> |
1da177e4 LT |
43 | #include <linux/errno.h> |
44 | #include <linux/timer.h> | |
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
40daafc8 | 46 | #include <asm/unaligned.h> |
d66f2b91 | 47 | #include <asm/cmpxchg.h> |
1da177e4 | 48 | #include <linux/filter.h> |
86e4ca66 | 49 | #include <linux/ratelimit.h> |
46b325c7 | 50 | #include <linux/seccomp.h> |
f3335031 | 51 | #include <linux/if_vlan.h> |
89aa0758 | 52 | #include <linux/bpf.h> |
d691f9e8 | 53 | #include <net/sch_generic.h> |
8d20aabe | 54 | #include <net/cls_cgroup.h> |
d3aa45ce | 55 | #include <net/dst_metadata.h> |
c46646d0 | 56 | #include <net/dst.h> |
538950a1 | 57 | #include <net/sock_reuseport.h> |
b1d9fc41 | 58 | #include <net/busy_poll.h> |
8c4b4c7e | 59 | #include <net/tcp.h> |
12bed760 | 60 | #include <net/xfrm.h> |
5acaee0a | 61 | #include <linux/bpf_trace.h> |
02671e23 | 62 | #include <net/xdp_sock.h> |
87f5fc7e DA |
63 | #include <linux/inetdevice.h> |
64 | #include <net/ip_fib.h> | |
65 | #include <net/flow.h> | |
66 | #include <net/arp.h> | |
fe94cc29 MX |
67 | #include <net/ipv6.h> |
68 | #include <linux/seg6_local.h> | |
69 | #include <net/seg6.h> | |
70 | #include <net/seg6_local.h> | |
1da177e4 | 71 | |
43db6d65 | 72 | /** |
f4979fce | 73 | * sk_filter_trim_cap - run a packet through a socket filter |
43db6d65 SH |
74 | * @sk: sock associated with &sk_buff |
75 | * @skb: buffer to filter | |
f4979fce | 76 | * @cap: limit on how short the eBPF program may trim the packet |
43db6d65 | 77 | * |
ff936a04 AS |
78 | * Run the eBPF program and then cut skb->data to correct size returned by |
79 | * the program. If pkt_len is 0 we toss packet. If skb->len is smaller | |
43db6d65 | 80 | * than pkt_len we keep whole skb->data. This is the socket level |
ff936a04 | 81 | * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
43db6d65 SH |
82 | * be accepted or -EPERM if the packet should be tossed. |
83 | * | |
84 | */ | |
f4979fce | 85 | int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
43db6d65 SH |
86 | { |
87 | int err; | |
88 | struct sk_filter *filter; | |
89 | ||
c93bdd0e MG |
90 | /* |
91 | * If the skb was allocated from pfmemalloc reserves, only | |
92 | * allow SOCK_MEMALLOC sockets to use it as this socket is | |
93 | * helping free memory | |
94 | */ | |
8fe809a9 ED |
95 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
96 | NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); | |
c93bdd0e | 97 | return -ENOMEM; |
8fe809a9 | 98 | } |
c11cd3a6 DM |
99 | err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
100 | if (err) | |
101 | return err; | |
102 | ||
43db6d65 SH |
103 | err = security_sock_rcv_skb(sk, skb); |
104 | if (err) | |
105 | return err; | |
106 | ||
80f8f102 ED |
107 | rcu_read_lock(); |
108 | filter = rcu_dereference(sk->sk_filter); | |
43db6d65 | 109 | if (filter) { |
8f917bba WB |
110 | struct sock *save_sk = skb->sk; |
111 | unsigned int pkt_len; | |
112 | ||
113 | skb->sk = sk; | |
114 | pkt_len = bpf_prog_run_save_cb(filter->prog, skb); | |
8f917bba | 115 | skb->sk = save_sk; |
d1f496fd | 116 | err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
43db6d65 | 117 | } |
80f8f102 | 118 | rcu_read_unlock(); |
43db6d65 SH |
119 | |
120 | return err; | |
121 | } | |
f4979fce | 122 | EXPORT_SYMBOL(sk_filter_trim_cap); |
43db6d65 | 123 | |
b390134c | 124 | BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) |
bd4cf0ed | 125 | { |
f3694e00 | 126 | return skb_get_poff(skb); |
bd4cf0ed AS |
127 | } |
128 | ||
b390134c | 129 | BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 130 | { |
bd4cf0ed AS |
131 | struct nlattr *nla; |
132 | ||
133 | if (skb_is_nonlinear(skb)) | |
134 | return 0; | |
135 | ||
05ab8f26 MK |
136 | if (skb->len < sizeof(struct nlattr)) |
137 | return 0; | |
138 | ||
30743837 | 139 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
140 | return 0; |
141 | ||
30743837 | 142 | nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
bd4cf0ed AS |
143 | if (nla) |
144 | return (void *) nla - (void *) skb->data; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
b390134c | 149 | BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
bd4cf0ed | 150 | { |
bd4cf0ed AS |
151 | struct nlattr *nla; |
152 | ||
153 | if (skb_is_nonlinear(skb)) | |
154 | return 0; | |
155 | ||
05ab8f26 MK |
156 | if (skb->len < sizeof(struct nlattr)) |
157 | return 0; | |
158 | ||
30743837 | 159 | if (a > skb->len - sizeof(struct nlattr)) |
bd4cf0ed AS |
160 | return 0; |
161 | ||
30743837 DB |
162 | nla = (struct nlattr *) &skb->data[a]; |
163 | if (nla->nla_len > skb->len - a) | |
bd4cf0ed AS |
164 | return 0; |
165 | ||
30743837 | 166 | nla = nla_find_nested(nla, x); |
bd4cf0ed AS |
167 | if (nla) |
168 | return (void *) nla - (void *) skb->data; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
e0cea7ce DB |
173 | BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, |
174 | data, int, headlen, int, offset) | |
175 | { | |
176 | u8 tmp, *ptr; | |
177 | const int len = sizeof(tmp); | |
178 | ||
179 | if (offset >= 0) { | |
180 | if (headlen - offset >= len) | |
181 | return *(u8 *)(data + offset); | |
182 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
183 | return tmp; | |
184 | } else { | |
185 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
186 | if (likely(ptr)) | |
187 | return *(u8 *)ptr; | |
188 | } | |
189 | ||
190 | return -EFAULT; | |
191 | } | |
192 | ||
193 | BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, | |
194 | int, offset) | |
195 | { | |
196 | return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, | |
197 | offset); | |
198 | } | |
199 | ||
200 | BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, | |
201 | data, int, headlen, int, offset) | |
202 | { | |
203 | u16 tmp, *ptr; | |
204 | const int len = sizeof(tmp); | |
205 | ||
206 | if (offset >= 0) { | |
207 | if (headlen - offset >= len) | |
208 | return get_unaligned_be16(data + offset); | |
209 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
210 | return be16_to_cpu(tmp); | |
211 | } else { | |
212 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
213 | if (likely(ptr)) | |
214 | return get_unaligned_be16(ptr); | |
215 | } | |
216 | ||
217 | return -EFAULT; | |
218 | } | |
219 | ||
220 | BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, | |
221 | int, offset) | |
222 | { | |
223 | return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, | |
224 | offset); | |
225 | } | |
226 | ||
227 | BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, | |
228 | data, int, headlen, int, offset) | |
229 | { | |
230 | u32 tmp, *ptr; | |
231 | const int len = sizeof(tmp); | |
232 | ||
233 | if (likely(offset >= 0)) { | |
234 | if (headlen - offset >= len) | |
235 | return get_unaligned_be32(data + offset); | |
236 | if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) | |
237 | return be32_to_cpu(tmp); | |
238 | } else { | |
239 | ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); | |
240 | if (likely(ptr)) | |
241 | return get_unaligned_be32(ptr); | |
242 | } | |
243 | ||
244 | return -EFAULT; | |
245 | } | |
246 | ||
247 | BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, | |
248 | int, offset) | |
249 | { | |
250 | return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, | |
251 | offset); | |
252 | } | |
253 | ||
b390134c | 254 | BPF_CALL_0(bpf_get_raw_cpu_id) |
bd4cf0ed AS |
255 | { |
256 | return raw_smp_processor_id(); | |
257 | } | |
258 | ||
80b48c44 | 259 | static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
b390134c | 260 | .func = bpf_get_raw_cpu_id, |
80b48c44 DB |
261 | .gpl_only = false, |
262 | .ret_type = RET_INTEGER, | |
263 | }; | |
264 | ||
9bac3d6d AS |
265 | static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
266 | struct bpf_insn *insn_buf) | |
267 | { | |
268 | struct bpf_insn *insn = insn_buf; | |
269 | ||
270 | switch (skb_field) { | |
271 | case SKF_AD_MARK: | |
272 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); | |
273 | ||
274 | *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, | |
275 | offsetof(struct sk_buff, mark)); | |
276 | break; | |
277 | ||
278 | case SKF_AD_PKTTYPE: | |
279 | *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); | |
280 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); | |
281 | #ifdef __BIG_ENDIAN_BITFIELD | |
282 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); | |
283 | #endif | |
284 | break; | |
285 | ||
286 | case SKF_AD_QUEUE: | |
287 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); | |
288 | ||
289 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
290 | offsetof(struct sk_buff, queue_mapping)); | |
291 | break; | |
c2497395 | 292 | |
c2497395 AS |
293 | case SKF_AD_VLAN_TAG: |
294 | case SKF_AD_VLAN_TAG_PRESENT: | |
295 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); | |
296 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); | |
297 | ||
298 | /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ | |
299 | *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, | |
300 | offsetof(struct sk_buff, vlan_tci)); | |
301 | if (skb_field == SKF_AD_VLAN_TAG) { | |
302 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, | |
303 | ~VLAN_TAG_PRESENT); | |
304 | } else { | |
305 | /* dst_reg >>= 12 */ | |
306 | *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12); | |
307 | /* dst_reg &= 1 */ | |
308 | *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); | |
309 | } | |
310 | break; | |
9bac3d6d AS |
311 | } |
312 | ||
313 | return insn - insn_buf; | |
314 | } | |
315 | ||
bd4cf0ed | 316 | static bool convert_bpf_extensions(struct sock_filter *fp, |
2695fb55 | 317 | struct bpf_insn **insnp) |
bd4cf0ed | 318 | { |
2695fb55 | 319 | struct bpf_insn *insn = *insnp; |
9bac3d6d | 320 | u32 cnt; |
bd4cf0ed AS |
321 | |
322 | switch (fp->k) { | |
323 | case SKF_AD_OFF + SKF_AD_PROTOCOL: | |
0b8c707d DB |
324 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); |
325 | ||
326 | /* A = *(u16 *) (CTX + offsetof(protocol)) */ | |
327 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
328 | offsetof(struct sk_buff, protocol)); | |
329 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
330 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
bd4cf0ed AS |
331 | break; |
332 | ||
333 | case SKF_AD_OFF + SKF_AD_PKTTYPE: | |
9bac3d6d AS |
334 | cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
335 | insn += cnt - 1; | |
bd4cf0ed AS |
336 | break; |
337 | ||
338 | case SKF_AD_OFF + SKF_AD_IFINDEX: | |
339 | case SKF_AD_OFF + SKF_AD_HATYPE: | |
bd4cf0ed AS |
340 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); |
341 | BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); | |
f8f6d679 | 342 | |
f035a515 | 343 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
f8f6d679 DB |
344 | BPF_REG_TMP, BPF_REG_CTX, |
345 | offsetof(struct sk_buff, dev)); | |
346 | /* if (tmp != 0) goto pc + 1 */ | |
347 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); | |
348 | *insn++ = BPF_EXIT_INSN(); | |
349 | if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) | |
350 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, | |
351 | offsetof(struct net_device, ifindex)); | |
352 | else | |
353 | *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, | |
354 | offsetof(struct net_device, type)); | |
bd4cf0ed AS |
355 | break; |
356 | ||
357 | case SKF_AD_OFF + SKF_AD_MARK: | |
9bac3d6d AS |
358 | cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
359 | insn += cnt - 1; | |
bd4cf0ed AS |
360 | break; |
361 | ||
362 | case SKF_AD_OFF + SKF_AD_RXHASH: | |
363 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); | |
364 | ||
9739eef1 AS |
365 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
366 | offsetof(struct sk_buff, hash)); | |
bd4cf0ed AS |
367 | break; |
368 | ||
369 | case SKF_AD_OFF + SKF_AD_QUEUE: | |
9bac3d6d AS |
370 | cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
371 | insn += cnt - 1; | |
bd4cf0ed AS |
372 | break; |
373 | ||
374 | case SKF_AD_OFF + SKF_AD_VLAN_TAG: | |
c2497395 AS |
375 | cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
376 | BPF_REG_A, BPF_REG_CTX, insn); | |
377 | insn += cnt - 1; | |
378 | break; | |
bd4cf0ed | 379 | |
c2497395 AS |
380 | case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
381 | cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, | |
382 | BPF_REG_A, BPF_REG_CTX, insn); | |
383 | insn += cnt - 1; | |
bd4cf0ed AS |
384 | break; |
385 | ||
27cd5452 MS |
386 | case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
387 | BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); | |
388 | ||
389 | /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ | |
390 | *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, | |
391 | offsetof(struct sk_buff, vlan_proto)); | |
392 | /* A = ntohs(A) [emitting a nop or swap16] */ | |
393 | *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); | |
394 | break; | |
395 | ||
bd4cf0ed AS |
396 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
397 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
398 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
399 | case SKF_AD_OFF + SKF_AD_CPU: | |
4cd3675e | 400 | case SKF_AD_OFF + SKF_AD_RANDOM: |
e430f34e | 401 | /* arg1 = CTX */ |
f8f6d679 | 402 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
bd4cf0ed | 403 | /* arg2 = A */ |
f8f6d679 | 404 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
bd4cf0ed | 405 | /* arg3 = X */ |
f8f6d679 | 406 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
e430f34e | 407 | /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
bd4cf0ed AS |
408 | switch (fp->k) { |
409 | case SKF_AD_OFF + SKF_AD_PAY_OFFSET: | |
b390134c | 410 | *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); |
bd4cf0ed AS |
411 | break; |
412 | case SKF_AD_OFF + SKF_AD_NLATTR: | |
b390134c | 413 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); |
bd4cf0ed AS |
414 | break; |
415 | case SKF_AD_OFF + SKF_AD_NLATTR_NEST: | |
b390134c | 416 | *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); |
bd4cf0ed AS |
417 | break; |
418 | case SKF_AD_OFF + SKF_AD_CPU: | |
b390134c | 419 | *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); |
bd4cf0ed | 420 | break; |
4cd3675e | 421 | case SKF_AD_OFF + SKF_AD_RANDOM: |
3ad00405 DB |
422 | *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
423 | bpf_user_rnd_init_once(); | |
4cd3675e | 424 | break; |
bd4cf0ed AS |
425 | } |
426 | break; | |
427 | ||
428 | case SKF_AD_OFF + SKF_AD_ALU_XOR_X: | |
9739eef1 AS |
429 | /* A ^= X */ |
430 | *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); | |
bd4cf0ed AS |
431 | break; |
432 | ||
433 | default: | |
434 | /* This is just a dummy call to avoid letting the compiler | |
435 | * evict __bpf_call_base() as an optimization. Placed here | |
436 | * where no-one bothers. | |
437 | */ | |
438 | BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); | |
439 | return false; | |
440 | } | |
441 | ||
442 | *insnp = insn; | |
443 | return true; | |
444 | } | |
445 | ||
e0cea7ce DB |
446 | static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) |
447 | { | |
448 | const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); | |
449 | int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); | |
450 | bool endian = BPF_SIZE(fp->code) == BPF_H || | |
451 | BPF_SIZE(fp->code) == BPF_W; | |
452 | bool indirect = BPF_MODE(fp->code) == BPF_IND; | |
453 | const int ip_align = NET_IP_ALIGN; | |
454 | struct bpf_insn *insn = *insnp; | |
455 | int offset = fp->k; | |
456 | ||
457 | if (!indirect && | |
458 | ((unaligned_ok && offset >= 0) || | |
459 | (!unaligned_ok && offset >= 0 && | |
460 | offset + ip_align >= 0 && | |
461 | offset + ip_align % size == 0))) { | |
59ee4129 DB |
462 | bool ldx_off_ok = offset <= S16_MAX; |
463 | ||
e0cea7ce DB |
464 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); |
465 | *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); | |
59ee4129 DB |
466 | *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, |
467 | size, 2 + endian + (!ldx_off_ok * 2)); | |
468 | if (ldx_off_ok) { | |
469 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
470 | BPF_REG_D, offset); | |
471 | } else { | |
472 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); | |
473 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); | |
474 | *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, | |
475 | BPF_REG_TMP, 0); | |
476 | } | |
e0cea7ce DB |
477 | if (endian) |
478 | *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); | |
479 | *insn++ = BPF_JMP_A(8); | |
480 | } | |
481 | ||
482 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); | |
483 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); | |
484 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); | |
485 | if (!indirect) { | |
486 | *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); | |
487 | } else { | |
488 | *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); | |
489 | if (fp->k) | |
490 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); | |
491 | } | |
492 | ||
493 | switch (BPF_SIZE(fp->code)) { | |
494 | case BPF_B: | |
495 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); | |
496 | break; | |
497 | case BPF_H: | |
498 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); | |
499 | break; | |
500 | case BPF_W: | |
501 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); | |
502 | break; | |
503 | default: | |
504 | return false; | |
505 | } | |
506 | ||
507 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); | |
508 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
509 | *insn = BPF_EXIT_INSN(); | |
510 | ||
511 | *insnp = insn; | |
512 | return true; | |
513 | } | |
514 | ||
bd4cf0ed | 515 | /** |
8fb575ca | 516 | * bpf_convert_filter - convert filter program |
bd4cf0ed AS |
517 | * @prog: the user passed filter program |
518 | * @len: the length of the user passed filter program | |
50bbfed9 | 519 | * @new_prog: allocated 'struct bpf_prog' or NULL |
bd4cf0ed | 520 | * @new_len: pointer to store length of converted program |
e0cea7ce | 521 | * @seen_ld_abs: bool whether we've seen ld_abs/ind |
bd4cf0ed | 522 | * |
1f504ec9 TK |
523 | * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
524 | * style extended BPF (eBPF). | |
bd4cf0ed AS |
525 | * Conversion workflow: |
526 | * | |
527 | * 1) First pass for calculating the new program length: | |
e0cea7ce | 528 | * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) |
bd4cf0ed AS |
529 | * |
530 | * 2) 2nd pass to remap in two passes: 1st pass finds new | |
531 | * jump offsets, 2nd pass remapping: | |
e0cea7ce | 532 | * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) |
bd4cf0ed | 533 | */ |
d9e12f42 | 534 | static int bpf_convert_filter(struct sock_filter *prog, int len, |
e0cea7ce DB |
535 | struct bpf_prog *new_prog, int *new_len, |
536 | bool *seen_ld_abs) | |
bd4cf0ed | 537 | { |
50bbfed9 AS |
538 | int new_flen = 0, pass = 0, target, i, stack_off; |
539 | struct bpf_insn *new_insn, *first_insn = NULL; | |
bd4cf0ed AS |
540 | struct sock_filter *fp; |
541 | int *addrs = NULL; | |
542 | u8 bpf_src; | |
543 | ||
544 | BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); | |
30743837 | 545 | BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
bd4cf0ed | 546 | |
6f9a093b | 547 | if (len <= 0 || len > BPF_MAXINSNS) |
bd4cf0ed AS |
548 | return -EINVAL; |
549 | ||
550 | if (new_prog) { | |
50bbfed9 | 551 | first_insn = new_prog->insnsi; |
658da937 DB |
552 | addrs = kcalloc(len, sizeof(*addrs), |
553 | GFP_KERNEL | __GFP_NOWARN); | |
bd4cf0ed AS |
554 | if (!addrs) |
555 | return -ENOMEM; | |
556 | } | |
557 | ||
558 | do_pass: | |
50bbfed9 | 559 | new_insn = first_insn; |
bd4cf0ed AS |
560 | fp = prog; |
561 | ||
8b614aeb | 562 | /* Classic BPF related prologue emission. */ |
50bbfed9 | 563 | if (new_prog) { |
8b614aeb DB |
564 | /* Classic BPF expects A and X to be reset first. These need |
565 | * to be guaranteed to be the first two instructions. | |
566 | */ | |
1d621674 DB |
567 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
568 | *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); | |
8b614aeb DB |
569 | |
570 | /* All programs must keep CTX in callee saved BPF_REG_CTX. | |
571 | * In eBPF case it's done by the compiler, here we need to | |
572 | * do this ourself. Initial CTX is present in BPF_REG_ARG1. | |
573 | */ | |
574 | *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); | |
e0cea7ce DB |
575 | if (*seen_ld_abs) { |
576 | /* For packet access in classic BPF, cache skb->data | |
577 | * in callee-saved BPF R8 and skb->len - skb->data_len | |
578 | * (headlen) in BPF R9. Since classic BPF is read-only | |
579 | * on CTX, we only need to cache it once. | |
580 | */ | |
581 | *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), | |
582 | BPF_REG_D, BPF_REG_CTX, | |
583 | offsetof(struct sk_buff, data)); | |
584 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, | |
585 | offsetof(struct sk_buff, len)); | |
586 | *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, | |
587 | offsetof(struct sk_buff, data_len)); | |
588 | *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); | |
589 | } | |
8b614aeb DB |
590 | } else { |
591 | new_insn += 3; | |
592 | } | |
bd4cf0ed AS |
593 | |
594 | for (i = 0; i < len; fp++, i++) { | |
e0cea7ce | 595 | struct bpf_insn tmp_insns[32] = { }; |
2695fb55 | 596 | struct bpf_insn *insn = tmp_insns; |
bd4cf0ed AS |
597 | |
598 | if (addrs) | |
50bbfed9 | 599 | addrs[i] = new_insn - first_insn; |
bd4cf0ed AS |
600 | |
601 | switch (fp->code) { | |
602 | /* All arithmetic insns and skb loads map as-is. */ | |
603 | case BPF_ALU | BPF_ADD | BPF_X: | |
604 | case BPF_ALU | BPF_ADD | BPF_K: | |
605 | case BPF_ALU | BPF_SUB | BPF_X: | |
606 | case BPF_ALU | BPF_SUB | BPF_K: | |
607 | case BPF_ALU | BPF_AND | BPF_X: | |
608 | case BPF_ALU | BPF_AND | BPF_K: | |
609 | case BPF_ALU | BPF_OR | BPF_X: | |
610 | case BPF_ALU | BPF_OR | BPF_K: | |
611 | case BPF_ALU | BPF_LSH | BPF_X: | |
612 | case BPF_ALU | BPF_LSH | BPF_K: | |
613 | case BPF_ALU | BPF_RSH | BPF_X: | |
614 | case BPF_ALU | BPF_RSH | BPF_K: | |
615 | case BPF_ALU | BPF_XOR | BPF_X: | |
616 | case BPF_ALU | BPF_XOR | BPF_K: | |
617 | case BPF_ALU | BPF_MUL | BPF_X: | |
618 | case BPF_ALU | BPF_MUL | BPF_K: | |
619 | case BPF_ALU | BPF_DIV | BPF_X: | |
620 | case BPF_ALU | BPF_DIV | BPF_K: | |
621 | case BPF_ALU | BPF_MOD | BPF_X: | |
622 | case BPF_ALU | BPF_MOD | BPF_K: | |
623 | case BPF_ALU | BPF_NEG: | |
624 | case BPF_LD | BPF_ABS | BPF_W: | |
625 | case BPF_LD | BPF_ABS | BPF_H: | |
626 | case BPF_LD | BPF_ABS | BPF_B: | |
627 | case BPF_LD | BPF_IND | BPF_W: | |
628 | case BPF_LD | BPF_IND | BPF_H: | |
629 | case BPF_LD | BPF_IND | BPF_B: | |
630 | /* Check for overloaded BPF extension and | |
631 | * directly convert it if found, otherwise | |
632 | * just move on with mapping. | |
633 | */ | |
634 | if (BPF_CLASS(fp->code) == BPF_LD && | |
635 | BPF_MODE(fp->code) == BPF_ABS && | |
636 | convert_bpf_extensions(fp, &insn)) | |
637 | break; | |
e0cea7ce DB |
638 | if (BPF_CLASS(fp->code) == BPF_LD && |
639 | convert_bpf_ld_abs(fp, &insn)) { | |
640 | *seen_ld_abs = true; | |
641 | break; | |
642 | } | |
bd4cf0ed | 643 | |
68fda450 | 644 | if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || |
f6b1b3bf | 645 | fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { |
68fda450 | 646 | *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); |
f6b1b3bf DB |
647 | /* Error with exception code on div/mod by 0. |
648 | * For cBPF programs, this was always return 0. | |
649 | */ | |
650 | *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); | |
651 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); | |
652 | *insn++ = BPF_EXIT_INSN(); | |
653 | } | |
68fda450 | 654 | |
f8f6d679 | 655 | *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
bd4cf0ed AS |
656 | break; |
657 | ||
f8f6d679 DB |
658 | /* Jump transformation cannot use BPF block macros |
659 | * everywhere as offset calculation and target updates | |
660 | * require a bit more work than the rest, i.e. jump | |
661 | * opcodes map as-is, but offsets need adjustment. | |
662 | */ | |
663 | ||
664 | #define BPF_EMIT_JMP \ | |
bd4cf0ed | 665 | do { \ |
050fad7c DB |
666 | const s32 off_min = S16_MIN, off_max = S16_MAX; \ |
667 | s32 off; \ | |
668 | \ | |
bd4cf0ed AS |
669 | if (target >= len || target < 0) \ |
670 | goto err; \ | |
050fad7c | 671 | off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ |
bd4cf0ed | 672 | /* Adjust pc relative offset for 2nd or 3rd insn. */ \ |
050fad7c DB |
673 | off -= insn - tmp_insns; \ |
674 | /* Reject anything not fitting into insn->off. */ \ | |
675 | if (off < off_min || off > off_max) \ | |
676 | goto err; \ | |
677 | insn->off = off; \ | |
bd4cf0ed AS |
678 | } while (0) |
679 | ||
f8f6d679 DB |
680 | case BPF_JMP | BPF_JA: |
681 | target = i + fp->k + 1; | |
682 | insn->code = fp->code; | |
683 | BPF_EMIT_JMP; | |
bd4cf0ed AS |
684 | break; |
685 | ||
686 | case BPF_JMP | BPF_JEQ | BPF_K: | |
687 | case BPF_JMP | BPF_JEQ | BPF_X: | |
688 | case BPF_JMP | BPF_JSET | BPF_K: | |
689 | case BPF_JMP | BPF_JSET | BPF_X: | |
690 | case BPF_JMP | BPF_JGT | BPF_K: | |
691 | case BPF_JMP | BPF_JGT | BPF_X: | |
692 | case BPF_JMP | BPF_JGE | BPF_K: | |
693 | case BPF_JMP | BPF_JGE | BPF_X: | |
694 | if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { | |
695 | /* BPF immediates are signed, zero extend | |
696 | * immediate into tmp register and use it | |
697 | * in compare insn. | |
698 | */ | |
f8f6d679 | 699 | *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
bd4cf0ed | 700 | |
e430f34e AS |
701 | insn->dst_reg = BPF_REG_A; |
702 | insn->src_reg = BPF_REG_TMP; | |
bd4cf0ed AS |
703 | bpf_src = BPF_X; |
704 | } else { | |
e430f34e | 705 | insn->dst_reg = BPF_REG_A; |
bd4cf0ed AS |
706 | insn->imm = fp->k; |
707 | bpf_src = BPF_SRC(fp->code); | |
19539ce7 | 708 | insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
1da177e4 | 709 | } |
bd4cf0ed AS |
710 | |
711 | /* Common case where 'jump_false' is next insn. */ | |
712 | if (fp->jf == 0) { | |
713 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
714 | target = i + fp->jt + 1; | |
f8f6d679 | 715 | BPF_EMIT_JMP; |
bd4cf0ed | 716 | break; |
1da177e4 | 717 | } |
bd4cf0ed | 718 | |
92b31a9a DB |
719 | /* Convert some jumps when 'jump_true' is next insn. */ |
720 | if (fp->jt == 0) { | |
721 | switch (BPF_OP(fp->code)) { | |
722 | case BPF_JEQ: | |
723 | insn->code = BPF_JMP | BPF_JNE | bpf_src; | |
724 | break; | |
725 | case BPF_JGT: | |
726 | insn->code = BPF_JMP | BPF_JLE | bpf_src; | |
727 | break; | |
728 | case BPF_JGE: | |
729 | insn->code = BPF_JMP | BPF_JLT | bpf_src; | |
730 | break; | |
731 | default: | |
732 | goto jmp_rest; | |
733 | } | |
734 | ||
bd4cf0ed | 735 | target = i + fp->jf + 1; |
f8f6d679 | 736 | BPF_EMIT_JMP; |
bd4cf0ed | 737 | break; |
0b05b2a4 | 738 | } |
92b31a9a | 739 | jmp_rest: |
bd4cf0ed AS |
740 | /* Other jumps are mapped into two insns: Jxx and JA. */ |
741 | target = i + fp->jt + 1; | |
742 | insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; | |
f8f6d679 | 743 | BPF_EMIT_JMP; |
bd4cf0ed AS |
744 | insn++; |
745 | ||
746 | insn->code = BPF_JMP | BPF_JA; | |
747 | target = i + fp->jf + 1; | |
f8f6d679 | 748 | BPF_EMIT_JMP; |
bd4cf0ed AS |
749 | break; |
750 | ||
751 | /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ | |
e0cea7ce DB |
752 | case BPF_LDX | BPF_MSH | BPF_B: { |
753 | struct sock_filter tmp = { | |
754 | .code = BPF_LD | BPF_ABS | BPF_B, | |
755 | .k = fp->k, | |
756 | }; | |
757 | ||
758 | *seen_ld_abs = true; | |
759 | ||
760 | /* X = A */ | |
761 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); | |
1268e253 | 762 | /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
e0cea7ce DB |
763 | convert_bpf_ld_abs(&tmp, &insn); |
764 | insn++; | |
9739eef1 | 765 | /* A &= 0xf */ |
f8f6d679 | 766 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
9739eef1 | 767 | /* A <<= 2 */ |
f8f6d679 | 768 | *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
e0cea7ce DB |
769 | /* tmp = X */ |
770 | *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); | |
9739eef1 | 771 | /* X = A */ |
f8f6d679 | 772 | *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
9739eef1 | 773 | /* A = tmp */ |
f8f6d679 | 774 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
bd4cf0ed | 775 | break; |
e0cea7ce | 776 | } |
6205b9cf DB |
777 | /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
778 | * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. | |
779 | */ | |
bd4cf0ed AS |
780 | case BPF_RET | BPF_A: |
781 | case BPF_RET | BPF_K: | |
6205b9cf DB |
782 | if (BPF_RVAL(fp->code) == BPF_K) |
783 | *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, | |
784 | 0, fp->k); | |
9739eef1 | 785 | *insn = BPF_EXIT_INSN(); |
bd4cf0ed AS |
786 | break; |
787 | ||
788 | /* Store to stack. */ | |
789 | case BPF_ST: | |
790 | case BPF_STX: | |
50bbfed9 | 791 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
792 | *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
793 | BPF_ST ? BPF_REG_A : BPF_REG_X, | |
50bbfed9 AS |
794 | -stack_off); |
795 | /* check_load_and_stores() verifies that classic BPF can | |
796 | * load from stack only after write, so tracking | |
797 | * stack_depth for ST|STX insns is enough | |
798 | */ | |
799 | if (new_prog && new_prog->aux->stack_depth < stack_off) | |
800 | new_prog->aux->stack_depth = stack_off; | |
bd4cf0ed AS |
801 | break; |
802 | ||
803 | /* Load from stack. */ | |
804 | case BPF_LD | BPF_MEM: | |
805 | case BPF_LDX | BPF_MEM: | |
50bbfed9 | 806 | stack_off = fp->k * 4 + 4; |
f8f6d679 DB |
807 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
808 | BPF_REG_A : BPF_REG_X, BPF_REG_FP, | |
50bbfed9 | 809 | -stack_off); |
bd4cf0ed AS |
810 | break; |
811 | ||
812 | /* A = K or X = K */ | |
813 | case BPF_LD | BPF_IMM: | |
814 | case BPF_LDX | BPF_IMM: | |
f8f6d679 DB |
815 | *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
816 | BPF_REG_A : BPF_REG_X, fp->k); | |
bd4cf0ed AS |
817 | break; |
818 | ||
819 | /* X = A */ | |
820 | case BPF_MISC | BPF_TAX: | |
f8f6d679 | 821 | *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
bd4cf0ed AS |
822 | break; |
823 | ||
824 | /* A = X */ | |
825 | case BPF_MISC | BPF_TXA: | |
f8f6d679 | 826 | *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
bd4cf0ed AS |
827 | break; |
828 | ||
829 | /* A = skb->len or X = skb->len */ | |
830 | case BPF_LD | BPF_W | BPF_LEN: | |
831 | case BPF_LDX | BPF_W | BPF_LEN: | |
f8f6d679 DB |
832 | *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
833 | BPF_REG_A : BPF_REG_X, BPF_REG_CTX, | |
834 | offsetof(struct sk_buff, len)); | |
bd4cf0ed AS |
835 | break; |
836 | ||
f8f6d679 | 837 | /* Access seccomp_data fields. */ |
bd4cf0ed | 838 | case BPF_LDX | BPF_ABS | BPF_W: |
9739eef1 AS |
839 | /* A = *(u32 *) (ctx + K) */ |
840 | *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); | |
bd4cf0ed AS |
841 | break; |
842 | ||
ca9f1fd2 | 843 | /* Unknown instruction. */ |
1da177e4 | 844 | default: |
bd4cf0ed | 845 | goto err; |
1da177e4 | 846 | } |
bd4cf0ed AS |
847 | |
848 | insn++; | |
849 | if (new_prog) | |
850 | memcpy(new_insn, tmp_insns, | |
851 | sizeof(*insn) * (insn - tmp_insns)); | |
bd4cf0ed | 852 | new_insn += insn - tmp_insns; |
1da177e4 LT |
853 | } |
854 | ||
bd4cf0ed AS |
855 | if (!new_prog) { |
856 | /* Only calculating new length. */ | |
50bbfed9 | 857 | *new_len = new_insn - first_insn; |
e0cea7ce DB |
858 | if (*seen_ld_abs) |
859 | *new_len += 4; /* Prologue bits. */ | |
bd4cf0ed AS |
860 | return 0; |
861 | } | |
862 | ||
863 | pass++; | |
50bbfed9 AS |
864 | if (new_flen != new_insn - first_insn) { |
865 | new_flen = new_insn - first_insn; | |
bd4cf0ed AS |
866 | if (pass > 2) |
867 | goto err; | |
bd4cf0ed AS |
868 | goto do_pass; |
869 | } | |
870 | ||
871 | kfree(addrs); | |
872 | BUG_ON(*new_len != new_flen); | |
1da177e4 | 873 | return 0; |
bd4cf0ed AS |
874 | err: |
875 | kfree(addrs); | |
876 | return -EINVAL; | |
1da177e4 LT |
877 | } |
878 | ||
bd4cf0ed | 879 | /* Security: |
bd4cf0ed | 880 | * |
2d5311e4 | 881 | * As we dont want to clear mem[] array for each packet going through |
8ea6e345 | 882 | * __bpf_prog_run(), we check that filter loaded by user never try to read |
2d5311e4 | 883 | * a cell if not previously written, and we check all branches to be sure |
25985edc | 884 | * a malicious user doesn't try to abuse us. |
2d5311e4 | 885 | */ |
ec31a05c | 886 | static int check_load_and_stores(const struct sock_filter *filter, int flen) |
2d5311e4 | 887 | { |
34805931 | 888 | u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
2d5311e4 ED |
889 | int pc, ret = 0; |
890 | ||
891 | BUILD_BUG_ON(BPF_MEMWORDS > 16); | |
34805931 | 892 | |
99e72a0f | 893 | masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
2d5311e4 ED |
894 | if (!masks) |
895 | return -ENOMEM; | |
34805931 | 896 | |
2d5311e4 ED |
897 | memset(masks, 0xff, flen * sizeof(*masks)); |
898 | ||
899 | for (pc = 0; pc < flen; pc++) { | |
900 | memvalid &= masks[pc]; | |
901 | ||
902 | switch (filter[pc].code) { | |
34805931 DB |
903 | case BPF_ST: |
904 | case BPF_STX: | |
2d5311e4 ED |
905 | memvalid |= (1 << filter[pc].k); |
906 | break; | |
34805931 DB |
907 | case BPF_LD | BPF_MEM: |
908 | case BPF_LDX | BPF_MEM: | |
2d5311e4 ED |
909 | if (!(memvalid & (1 << filter[pc].k))) { |
910 | ret = -EINVAL; | |
911 | goto error; | |
912 | } | |
913 | break; | |
34805931 DB |
914 | case BPF_JMP | BPF_JA: |
915 | /* A jump must set masks on target */ | |
2d5311e4 ED |
916 | masks[pc + 1 + filter[pc].k] &= memvalid; |
917 | memvalid = ~0; | |
918 | break; | |
34805931 DB |
919 | case BPF_JMP | BPF_JEQ | BPF_K: |
920 | case BPF_JMP | BPF_JEQ | BPF_X: | |
921 | case BPF_JMP | BPF_JGE | BPF_K: | |
922 | case BPF_JMP | BPF_JGE | BPF_X: | |
923 | case BPF_JMP | BPF_JGT | BPF_K: | |
924 | case BPF_JMP | BPF_JGT | BPF_X: | |
925 | case BPF_JMP | BPF_JSET | BPF_K: | |
926 | case BPF_JMP | BPF_JSET | BPF_X: | |
927 | /* A jump must set masks on targets */ | |
2d5311e4 ED |
928 | masks[pc + 1 + filter[pc].jt] &= memvalid; |
929 | masks[pc + 1 + filter[pc].jf] &= memvalid; | |
930 | memvalid = ~0; | |
931 | break; | |
932 | } | |
933 | } | |
934 | error: | |
935 | kfree(masks); | |
936 | return ret; | |
937 | } | |
938 | ||
34805931 DB |
939 | static bool chk_code_allowed(u16 code_to_probe) |
940 | { | |
941 | static const bool codes[] = { | |
942 | /* 32 bit ALU operations */ | |
943 | [BPF_ALU | BPF_ADD | BPF_K] = true, | |
944 | [BPF_ALU | BPF_ADD | BPF_X] = true, | |
945 | [BPF_ALU | BPF_SUB | BPF_K] = true, | |
946 | [BPF_ALU | BPF_SUB | BPF_X] = true, | |
947 | [BPF_ALU | BPF_MUL | BPF_K] = true, | |
948 | [BPF_ALU | BPF_MUL | BPF_X] = true, | |
949 | [BPF_ALU | BPF_DIV | BPF_K] = true, | |
950 | [BPF_ALU | BPF_DIV | BPF_X] = true, | |
951 | [BPF_ALU | BPF_MOD | BPF_K] = true, | |
952 | [BPF_ALU | BPF_MOD | BPF_X] = true, | |
953 | [BPF_ALU | BPF_AND | BPF_K] = true, | |
954 | [BPF_ALU | BPF_AND | BPF_X] = true, | |
955 | [BPF_ALU | BPF_OR | BPF_K] = true, | |
956 | [BPF_ALU | BPF_OR | BPF_X] = true, | |
957 | [BPF_ALU | BPF_XOR | BPF_K] = true, | |
958 | [BPF_ALU | BPF_XOR | BPF_X] = true, | |
959 | [BPF_ALU | BPF_LSH | BPF_K] = true, | |
960 | [BPF_ALU | BPF_LSH | BPF_X] = true, | |
961 | [BPF_ALU | BPF_RSH | BPF_K] = true, | |
962 | [BPF_ALU | BPF_RSH | BPF_X] = true, | |
963 | [BPF_ALU | BPF_NEG] = true, | |
964 | /* Load instructions */ | |
965 | [BPF_LD | BPF_W | BPF_ABS] = true, | |
966 | [BPF_LD | BPF_H | BPF_ABS] = true, | |
967 | [BPF_LD | BPF_B | BPF_ABS] = true, | |
968 | [BPF_LD | BPF_W | BPF_LEN] = true, | |
969 | [BPF_LD | BPF_W | BPF_IND] = true, | |
970 | [BPF_LD | BPF_H | BPF_IND] = true, | |
971 | [BPF_LD | BPF_B | BPF_IND] = true, | |
972 | [BPF_LD | BPF_IMM] = true, | |
973 | [BPF_LD | BPF_MEM] = true, | |
974 | [BPF_LDX | BPF_W | BPF_LEN] = true, | |
975 | [BPF_LDX | BPF_B | BPF_MSH] = true, | |
976 | [BPF_LDX | BPF_IMM] = true, | |
977 | [BPF_LDX | BPF_MEM] = true, | |
978 | /* Store instructions */ | |
979 | [BPF_ST] = true, | |
980 | [BPF_STX] = true, | |
981 | /* Misc instructions */ | |
982 | [BPF_MISC | BPF_TAX] = true, | |
983 | [BPF_MISC | BPF_TXA] = true, | |
984 | /* Return instructions */ | |
985 | [BPF_RET | BPF_K] = true, | |
986 | [BPF_RET | BPF_A] = true, | |
987 | /* Jump instructions */ | |
988 | [BPF_JMP | BPF_JA] = true, | |
989 | [BPF_JMP | BPF_JEQ | BPF_K] = true, | |
990 | [BPF_JMP | BPF_JEQ | BPF_X] = true, | |
991 | [BPF_JMP | BPF_JGE | BPF_K] = true, | |
992 | [BPF_JMP | BPF_JGE | BPF_X] = true, | |
993 | [BPF_JMP | BPF_JGT | BPF_K] = true, | |
994 | [BPF_JMP | BPF_JGT | BPF_X] = true, | |
995 | [BPF_JMP | BPF_JSET | BPF_K] = true, | |
996 | [BPF_JMP | BPF_JSET | BPF_X] = true, | |
997 | }; | |
998 | ||
999 | if (code_to_probe >= ARRAY_SIZE(codes)) | |
1000 | return false; | |
1001 | ||
1002 | return codes[code_to_probe]; | |
1003 | } | |
1004 | ||
f7bd9e36 DB |
1005 | static bool bpf_check_basics_ok(const struct sock_filter *filter, |
1006 | unsigned int flen) | |
1007 | { | |
1008 | if (filter == NULL) | |
1009 | return false; | |
1010 | if (flen == 0 || flen > BPF_MAXINSNS) | |
1011 | return false; | |
1012 | ||
1013 | return true; | |
1014 | } | |
1015 | ||
1da177e4 | 1016 | /** |
4df95ff4 | 1017 | * bpf_check_classic - verify socket filter code |
1da177e4 LT |
1018 | * @filter: filter to verify |
1019 | * @flen: length of filter | |
1020 | * | |
1021 | * Check the user's filter code. If we let some ugly | |
1022 | * filter code slip through kaboom! The filter must contain | |
93699863 KK |
1023 | * no references or jumps that are out of range, no illegal |
1024 | * instructions, and must end with a RET instruction. | |
1da177e4 | 1025 | * |
7b11f69f KK |
1026 | * All jumps are forward as they are not signed. |
1027 | * | |
1028 | * Returns 0 if the rule set is legal or -EINVAL if not. | |
1da177e4 | 1029 | */ |
d9e12f42 NS |
1030 | static int bpf_check_classic(const struct sock_filter *filter, |
1031 | unsigned int flen) | |
1da177e4 | 1032 | { |
aa1113d9 | 1033 | bool anc_found; |
34805931 | 1034 | int pc; |
1da177e4 | 1035 | |
34805931 | 1036 | /* Check the filter code now */ |
1da177e4 | 1037 | for (pc = 0; pc < flen; pc++) { |
ec31a05c | 1038 | const struct sock_filter *ftest = &filter[pc]; |
93699863 | 1039 | |
34805931 DB |
1040 | /* May we actually operate on this code? */ |
1041 | if (!chk_code_allowed(ftest->code)) | |
cba328fc | 1042 | return -EINVAL; |
34805931 | 1043 | |
93699863 | 1044 | /* Some instructions need special checks */ |
34805931 DB |
1045 | switch (ftest->code) { |
1046 | case BPF_ALU | BPF_DIV | BPF_K: | |
1047 | case BPF_ALU | BPF_MOD | BPF_K: | |
1048 | /* Check for division by zero */ | |
b6069a95 ED |
1049 | if (ftest->k == 0) |
1050 | return -EINVAL; | |
1051 | break; | |
229394e8 RV |
1052 | case BPF_ALU | BPF_LSH | BPF_K: |
1053 | case BPF_ALU | BPF_RSH | BPF_K: | |
1054 | if (ftest->k >= 32) | |
1055 | return -EINVAL; | |
1056 | break; | |
34805931 DB |
1057 | case BPF_LD | BPF_MEM: |
1058 | case BPF_LDX | BPF_MEM: | |
1059 | case BPF_ST: | |
1060 | case BPF_STX: | |
1061 | /* Check for invalid memory addresses */ | |
93699863 KK |
1062 | if (ftest->k >= BPF_MEMWORDS) |
1063 | return -EINVAL; | |
1064 | break; | |
34805931 DB |
1065 | case BPF_JMP | BPF_JA: |
1066 | /* Note, the large ftest->k might cause loops. | |
93699863 KK |
1067 | * Compare this with conditional jumps below, |
1068 | * where offsets are limited. --ANK (981016) | |
1069 | */ | |
34805931 | 1070 | if (ftest->k >= (unsigned int)(flen - pc - 1)) |
93699863 | 1071 | return -EINVAL; |
01f2f3f6 | 1072 | break; |
34805931 DB |
1073 | case BPF_JMP | BPF_JEQ | BPF_K: |
1074 | case BPF_JMP | BPF_JEQ | BPF_X: | |
1075 | case BPF_JMP | BPF_JGE | BPF_K: | |
1076 | case BPF_JMP | BPF_JGE | BPF_X: | |
1077 | case BPF_JMP | BPF_JGT | BPF_K: | |
1078 | case BPF_JMP | BPF_JGT | BPF_X: | |
1079 | case BPF_JMP | BPF_JSET | BPF_K: | |
1080 | case BPF_JMP | BPF_JSET | BPF_X: | |
1081 | /* Both conditionals must be safe */ | |
e35bedf3 | 1082 | if (pc + ftest->jt + 1 >= flen || |
93699863 KK |
1083 | pc + ftest->jf + 1 >= flen) |
1084 | return -EINVAL; | |
cba328fc | 1085 | break; |
34805931 DB |
1086 | case BPF_LD | BPF_W | BPF_ABS: |
1087 | case BPF_LD | BPF_H | BPF_ABS: | |
1088 | case BPF_LD | BPF_B | BPF_ABS: | |
aa1113d9 | 1089 | anc_found = false; |
34805931 DB |
1090 | if (bpf_anc_helper(ftest) & BPF_ANC) |
1091 | anc_found = true; | |
1092 | /* Ancillary operation unknown or unsupported */ | |
aa1113d9 DB |
1093 | if (anc_found == false && ftest->k >= SKF_AD_OFF) |
1094 | return -EINVAL; | |
01f2f3f6 HPP |
1095 | } |
1096 | } | |
93699863 | 1097 | |
34805931 | 1098 | /* Last instruction must be a RET code */ |
01f2f3f6 | 1099 | switch (filter[flen - 1].code) { |
34805931 DB |
1100 | case BPF_RET | BPF_K: |
1101 | case BPF_RET | BPF_A: | |
2d5311e4 | 1102 | return check_load_and_stores(filter, flen); |
cba328fc | 1103 | } |
34805931 | 1104 | |
cba328fc | 1105 | return -EINVAL; |
1da177e4 LT |
1106 | } |
1107 | ||
7ae457c1 AS |
1108 | static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
1109 | const struct sock_fprog *fprog) | |
a3ea269b | 1110 | { |
009937e7 | 1111 | unsigned int fsize = bpf_classic_proglen(fprog); |
a3ea269b DB |
1112 | struct sock_fprog_kern *fkprog; |
1113 | ||
1114 | fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); | |
1115 | if (!fp->orig_prog) | |
1116 | return -ENOMEM; | |
1117 | ||
1118 | fkprog = fp->orig_prog; | |
1119 | fkprog->len = fprog->len; | |
658da937 DB |
1120 | |
1121 | fkprog->filter = kmemdup(fp->insns, fsize, | |
1122 | GFP_KERNEL | __GFP_NOWARN); | |
a3ea269b DB |
1123 | if (!fkprog->filter) { |
1124 | kfree(fp->orig_prog); | |
1125 | return -ENOMEM; | |
1126 | } | |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
7ae457c1 | 1131 | static void bpf_release_orig_filter(struct bpf_prog *fp) |
a3ea269b DB |
1132 | { |
1133 | struct sock_fprog_kern *fprog = fp->orig_prog; | |
1134 | ||
1135 | if (fprog) { | |
1136 | kfree(fprog->filter); | |
1137 | kfree(fprog); | |
1138 | } | |
1139 | } | |
1140 | ||
7ae457c1 AS |
1141 | static void __bpf_prog_release(struct bpf_prog *prog) |
1142 | { | |
24701ece | 1143 | if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
89aa0758 AS |
1144 | bpf_prog_put(prog); |
1145 | } else { | |
1146 | bpf_release_orig_filter(prog); | |
1147 | bpf_prog_free(prog); | |
1148 | } | |
7ae457c1 AS |
1149 | } |
1150 | ||
34c5bd66 PN |
1151 | static void __sk_filter_release(struct sk_filter *fp) |
1152 | { | |
7ae457c1 AS |
1153 | __bpf_prog_release(fp->prog); |
1154 | kfree(fp); | |
34c5bd66 PN |
1155 | } |
1156 | ||
47e958ea | 1157 | /** |
46bcf14f | 1158 | * sk_filter_release_rcu - Release a socket filter by rcu_head |
47e958ea PE |
1159 | * @rcu: rcu_head that contains the sk_filter to free |
1160 | */ | |
fbc907f0 | 1161 | static void sk_filter_release_rcu(struct rcu_head *rcu) |
47e958ea PE |
1162 | { |
1163 | struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); | |
1164 | ||
34c5bd66 | 1165 | __sk_filter_release(fp); |
47e958ea | 1166 | } |
fbc907f0 DB |
1167 | |
1168 | /** | |
1169 | * sk_filter_release - release a socket filter | |
1170 | * @fp: filter to remove | |
1171 | * | |
1172 | * Remove a filter from a socket and release its resources. | |
1173 | */ | |
1174 | static void sk_filter_release(struct sk_filter *fp) | |
1175 | { | |
4c355cdf | 1176 | if (refcount_dec_and_test(&fp->refcnt)) |
fbc907f0 DB |
1177 | call_rcu(&fp->rcu, sk_filter_release_rcu); |
1178 | } | |
1179 | ||
1180 | void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) | |
1181 | { | |
7ae457c1 | 1182 | u32 filter_size = bpf_prog_size(fp->prog->len); |
fbc907f0 | 1183 | |
278571ba AS |
1184 | atomic_sub(filter_size, &sk->sk_omem_alloc); |
1185 | sk_filter_release(fp); | |
fbc907f0 | 1186 | } |
47e958ea | 1187 | |
278571ba AS |
1188 | /* try to charge the socket memory if there is space available |
1189 | * return true on success | |
1190 | */ | |
4c355cdf | 1191 | static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
bd4cf0ed | 1192 | { |
7ae457c1 | 1193 | u32 filter_size = bpf_prog_size(fp->prog->len); |
278571ba AS |
1194 | |
1195 | /* same check as in sock_kmalloc() */ | |
1196 | if (filter_size <= sysctl_optmem_max && | |
1197 | atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { | |
278571ba AS |
1198 | atomic_add(filter_size, &sk->sk_omem_alloc); |
1199 | return true; | |
bd4cf0ed | 1200 | } |
278571ba | 1201 | return false; |
bd4cf0ed AS |
1202 | } |
1203 | ||
4c355cdf RE |
1204 | bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
1205 | { | |
eefca20e ED |
1206 | if (!refcount_inc_not_zero(&fp->refcnt)) |
1207 | return false; | |
1208 | ||
1209 | if (!__sk_filter_charge(sk, fp)) { | |
1210 | sk_filter_release(fp); | |
1211 | return false; | |
1212 | } | |
1213 | return true; | |
4c355cdf RE |
1214 | } |
1215 | ||
7ae457c1 | 1216 | static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
bd4cf0ed AS |
1217 | { |
1218 | struct sock_filter *old_prog; | |
7ae457c1 | 1219 | struct bpf_prog *old_fp; |
34805931 | 1220 | int err, new_len, old_len = fp->len; |
e0cea7ce | 1221 | bool seen_ld_abs = false; |
bd4cf0ed AS |
1222 | |
1223 | /* We are free to overwrite insns et al right here as it | |
1224 | * won't be used at this point in time anymore internally | |
1225 | * after the migration to the internal BPF instruction | |
1226 | * representation. | |
1227 | */ | |
1228 | BUILD_BUG_ON(sizeof(struct sock_filter) != | |
2695fb55 | 1229 | sizeof(struct bpf_insn)); |
bd4cf0ed | 1230 | |
bd4cf0ed AS |
1231 | /* Conversion cannot happen on overlapping memory areas, |
1232 | * so we need to keep the user BPF around until the 2nd | |
1233 | * pass. At this time, the user BPF is stored in fp->insns. | |
1234 | */ | |
1235 | old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), | |
658da937 | 1236 | GFP_KERNEL | __GFP_NOWARN); |
bd4cf0ed AS |
1237 | if (!old_prog) { |
1238 | err = -ENOMEM; | |
1239 | goto out_err; | |
1240 | } | |
1241 | ||
1242 | /* 1st pass: calculate the new program length. */ | |
e0cea7ce DB |
1243 | err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, |
1244 | &seen_ld_abs); | |
bd4cf0ed AS |
1245 | if (err) |
1246 | goto out_err_free; | |
1247 | ||
1248 | /* Expand fp for appending the new filter representation. */ | |
1249 | old_fp = fp; | |
60a3b225 | 1250 | fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
bd4cf0ed AS |
1251 | if (!fp) { |
1252 | /* The old_fp is still around in case we couldn't | |
1253 | * allocate new memory, so uncharge on that one. | |
1254 | */ | |
1255 | fp = old_fp; | |
1256 | err = -ENOMEM; | |
1257 | goto out_err_free; | |
1258 | } | |
1259 | ||
bd4cf0ed AS |
1260 | fp->len = new_len; |
1261 | ||
2695fb55 | 1262 | /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
e0cea7ce DB |
1263 | err = bpf_convert_filter(old_prog, old_len, fp, &new_len, |
1264 | &seen_ld_abs); | |
bd4cf0ed | 1265 | if (err) |
8fb575ca | 1266 | /* 2nd bpf_convert_filter() can fail only if it fails |
bd4cf0ed AS |
1267 | * to allocate memory, remapping must succeed. Note, |
1268 | * that at this time old_fp has already been released | |
278571ba | 1269 | * by krealloc(). |
bd4cf0ed AS |
1270 | */ |
1271 | goto out_err_free; | |
1272 | ||
d1c55ab5 | 1273 | fp = bpf_prog_select_runtime(fp, &err); |
290af866 AS |
1274 | if (err) |
1275 | goto out_err_free; | |
5fe821a9 | 1276 | |
bd4cf0ed AS |
1277 | kfree(old_prog); |
1278 | return fp; | |
1279 | ||
1280 | out_err_free: | |
1281 | kfree(old_prog); | |
1282 | out_err: | |
7ae457c1 | 1283 | __bpf_prog_release(fp); |
bd4cf0ed AS |
1284 | return ERR_PTR(err); |
1285 | } | |
1286 | ||
ac67eb2c DB |
1287 | static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
1288 | bpf_aux_classic_check_t trans) | |
302d6637 JP |
1289 | { |
1290 | int err; | |
1291 | ||
bd4cf0ed | 1292 | fp->bpf_func = NULL; |
a91263d5 | 1293 | fp->jited = 0; |
302d6637 | 1294 | |
4df95ff4 | 1295 | err = bpf_check_classic(fp->insns, fp->len); |
418c96ac | 1296 | if (err) { |
7ae457c1 | 1297 | __bpf_prog_release(fp); |
bd4cf0ed | 1298 | return ERR_PTR(err); |
418c96ac | 1299 | } |
302d6637 | 1300 | |
4ae92bc7 NS |
1301 | /* There might be additional checks and transformations |
1302 | * needed on classic filters, f.e. in case of seccomp. | |
1303 | */ | |
1304 | if (trans) { | |
1305 | err = trans(fp->insns, fp->len); | |
1306 | if (err) { | |
1307 | __bpf_prog_release(fp); | |
1308 | return ERR_PTR(err); | |
1309 | } | |
1310 | } | |
1311 | ||
bd4cf0ed AS |
1312 | /* Probe if we can JIT compile the filter and if so, do |
1313 | * the compilation of the filter. | |
1314 | */ | |
302d6637 | 1315 | bpf_jit_compile(fp); |
bd4cf0ed AS |
1316 | |
1317 | /* JIT compiler couldn't process this filter, so do the | |
1318 | * internal BPF translation for the optimized interpreter. | |
1319 | */ | |
5fe821a9 | 1320 | if (!fp->jited) |
7ae457c1 | 1321 | fp = bpf_migrate_filter(fp); |
bd4cf0ed AS |
1322 | |
1323 | return fp; | |
302d6637 JP |
1324 | } |
1325 | ||
1326 | /** | |
7ae457c1 | 1327 | * bpf_prog_create - create an unattached filter |
c6c4b97c | 1328 | * @pfp: the unattached filter that is created |
677a9fd3 | 1329 | * @fprog: the filter program |
302d6637 | 1330 | * |
c6c4b97c | 1331 | * Create a filter independent of any socket. We first run some |
302d6637 JP |
1332 | * sanity checks on it to make sure it does not explode on us later. |
1333 | * If an error occurs or there is insufficient memory for the filter | |
1334 | * a negative errno code is returned. On success the return is zero. | |
1335 | */ | |
7ae457c1 | 1336 | int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
302d6637 | 1337 | { |
009937e7 | 1338 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1339 | struct bpf_prog *fp; |
302d6637 JP |
1340 | |
1341 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1342 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
302d6637 JP |
1343 | return -EINVAL; |
1344 | ||
60a3b225 | 1345 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
302d6637 JP |
1346 | if (!fp) |
1347 | return -ENOMEM; | |
a3ea269b | 1348 | |
302d6637 JP |
1349 | memcpy(fp->insns, fprog->filter, fsize); |
1350 | ||
302d6637 | 1351 | fp->len = fprog->len; |
a3ea269b DB |
1352 | /* Since unattached filters are not copied back to user |
1353 | * space through sk_get_filter(), we do not need to hold | |
1354 | * a copy here, and can spare us the work. | |
1355 | */ | |
1356 | fp->orig_prog = NULL; | |
302d6637 | 1357 | |
7ae457c1 | 1358 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1359 | * memory in case something goes wrong. |
1360 | */ | |
4ae92bc7 | 1361 | fp = bpf_prepare_filter(fp, NULL); |
bd4cf0ed AS |
1362 | if (IS_ERR(fp)) |
1363 | return PTR_ERR(fp); | |
302d6637 JP |
1364 | |
1365 | *pfp = fp; | |
1366 | return 0; | |
302d6637 | 1367 | } |
7ae457c1 | 1368 | EXPORT_SYMBOL_GPL(bpf_prog_create); |
302d6637 | 1369 | |
ac67eb2c DB |
1370 | /** |
1371 | * bpf_prog_create_from_user - create an unattached filter from user buffer | |
1372 | * @pfp: the unattached filter that is created | |
1373 | * @fprog: the filter program | |
1374 | * @trans: post-classic verifier transformation handler | |
bab18991 | 1375 | * @save_orig: save classic BPF program |
ac67eb2c DB |
1376 | * |
1377 | * This function effectively does the same as bpf_prog_create(), only | |
1378 | * that it builds up its insns buffer from user space provided buffer. | |
1379 | * It also allows for passing a bpf_aux_classic_check_t handler. | |
1380 | */ | |
1381 | int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, | |
bab18991 | 1382 | bpf_aux_classic_check_t trans, bool save_orig) |
ac67eb2c DB |
1383 | { |
1384 | unsigned int fsize = bpf_classic_proglen(fprog); | |
1385 | struct bpf_prog *fp; | |
bab18991 | 1386 | int err; |
ac67eb2c DB |
1387 | |
1388 | /* Make sure new filter is there and in the right amounts. */ | |
f7bd9e36 | 1389 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
ac67eb2c DB |
1390 | return -EINVAL; |
1391 | ||
1392 | fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); | |
1393 | if (!fp) | |
1394 | return -ENOMEM; | |
1395 | ||
1396 | if (copy_from_user(fp->insns, fprog->filter, fsize)) { | |
1397 | __bpf_prog_free(fp); | |
1398 | return -EFAULT; | |
1399 | } | |
1400 | ||
1401 | fp->len = fprog->len; | |
ac67eb2c DB |
1402 | fp->orig_prog = NULL; |
1403 | ||
bab18991 DB |
1404 | if (save_orig) { |
1405 | err = bpf_prog_store_orig_filter(fp, fprog); | |
1406 | if (err) { | |
1407 | __bpf_prog_free(fp); | |
1408 | return -ENOMEM; | |
1409 | } | |
1410 | } | |
1411 | ||
ac67eb2c DB |
1412 | /* bpf_prepare_filter() already takes care of freeing |
1413 | * memory in case something goes wrong. | |
1414 | */ | |
1415 | fp = bpf_prepare_filter(fp, trans); | |
1416 | if (IS_ERR(fp)) | |
1417 | return PTR_ERR(fp); | |
1418 | ||
1419 | *pfp = fp; | |
1420 | return 0; | |
1421 | } | |
2ea273d7 | 1422 | EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
ac67eb2c | 1423 | |
7ae457c1 | 1424 | void bpf_prog_destroy(struct bpf_prog *fp) |
302d6637 | 1425 | { |
7ae457c1 | 1426 | __bpf_prog_release(fp); |
302d6637 | 1427 | } |
7ae457c1 | 1428 | EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
302d6637 | 1429 | |
8ced425e | 1430 | static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
49b31e57 DB |
1431 | { |
1432 | struct sk_filter *fp, *old_fp; | |
1433 | ||
1434 | fp = kmalloc(sizeof(*fp), GFP_KERNEL); | |
1435 | if (!fp) | |
1436 | return -ENOMEM; | |
1437 | ||
1438 | fp->prog = prog; | |
49b31e57 | 1439 | |
4c355cdf | 1440 | if (!__sk_filter_charge(sk, fp)) { |
49b31e57 DB |
1441 | kfree(fp); |
1442 | return -ENOMEM; | |
1443 | } | |
4c355cdf | 1444 | refcount_set(&fp->refcnt, 1); |
49b31e57 | 1445 | |
8ced425e HFS |
1446 | old_fp = rcu_dereference_protected(sk->sk_filter, |
1447 | lockdep_sock_is_held(sk)); | |
49b31e57 | 1448 | rcu_assign_pointer(sk->sk_filter, fp); |
8ced425e | 1449 | |
49b31e57 DB |
1450 | if (old_fp) |
1451 | sk_filter_uncharge(sk, old_fp); | |
1452 | ||
1453 | return 0; | |
1454 | } | |
1455 | ||
538950a1 CG |
1456 | static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk) |
1457 | { | |
1458 | struct bpf_prog *old_prog; | |
1459 | int err; | |
1460 | ||
1461 | if (bpf_prog_size(prog->len) > sysctl_optmem_max) | |
1462 | return -ENOMEM; | |
1463 | ||
fa463497 | 1464 | if (sk_unhashed(sk) && sk->sk_reuseport) { |
538950a1 CG |
1465 | err = reuseport_alloc(sk); |
1466 | if (err) | |
1467 | return err; | |
1468 | } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) { | |
1469 | /* The socket wasn't bound with SO_REUSEPORT */ | |
1470 | return -EINVAL; | |
1471 | } | |
1472 | ||
1473 | old_prog = reuseport_attach_prog(sk, prog); | |
1474 | if (old_prog) | |
1475 | bpf_prog_destroy(old_prog); | |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | static | |
1481 | struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) | |
1da177e4 | 1482 | { |
009937e7 | 1483 | unsigned int fsize = bpf_classic_proglen(fprog); |
7ae457c1 | 1484 | struct bpf_prog *prog; |
1da177e4 LT |
1485 | int err; |
1486 | ||
d59577b6 | 1487 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1488 | return ERR_PTR(-EPERM); |
d59577b6 | 1489 | |
1da177e4 | 1490 | /* Make sure new filter is there and in the right amounts. */ |
f7bd9e36 | 1491 | if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
538950a1 | 1492 | return ERR_PTR(-EINVAL); |
1da177e4 | 1493 | |
f7bd9e36 | 1494 | prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
7ae457c1 | 1495 | if (!prog) |
538950a1 | 1496 | return ERR_PTR(-ENOMEM); |
a3ea269b | 1497 | |
7ae457c1 | 1498 | if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
c0d1379a | 1499 | __bpf_prog_free(prog); |
538950a1 | 1500 | return ERR_PTR(-EFAULT); |
1da177e4 LT |
1501 | } |
1502 | ||
7ae457c1 | 1503 | prog->len = fprog->len; |
1da177e4 | 1504 | |
7ae457c1 | 1505 | err = bpf_prog_store_orig_filter(prog, fprog); |
a3ea269b | 1506 | if (err) { |
c0d1379a | 1507 | __bpf_prog_free(prog); |
538950a1 | 1508 | return ERR_PTR(-ENOMEM); |
a3ea269b DB |
1509 | } |
1510 | ||
7ae457c1 | 1511 | /* bpf_prepare_filter() already takes care of freeing |
bd4cf0ed AS |
1512 | * memory in case something goes wrong. |
1513 | */ | |
538950a1 CG |
1514 | return bpf_prepare_filter(prog, NULL); |
1515 | } | |
1516 | ||
1517 | /** | |
1518 | * sk_attach_filter - attach a socket filter | |
1519 | * @fprog: the filter program | |
1520 | * @sk: the socket to use | |
1521 | * | |
1522 | * Attach the user's filter code. We first run some sanity checks on | |
1523 | * it to make sure it does not explode on us later. If an error | |
1524 | * occurs or there is insufficient memory for the filter a negative | |
1525 | * errno code is returned. On success the return is zero. | |
1526 | */ | |
8ced425e | 1527 | int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
538950a1 CG |
1528 | { |
1529 | struct bpf_prog *prog = __get_filter(fprog, sk); | |
1530 | int err; | |
1531 | ||
7ae457c1 AS |
1532 | if (IS_ERR(prog)) |
1533 | return PTR_ERR(prog); | |
1534 | ||
8ced425e | 1535 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1536 | if (err < 0) { |
7ae457c1 | 1537 | __bpf_prog_release(prog); |
49b31e57 | 1538 | return err; |
278571ba AS |
1539 | } |
1540 | ||
d3904b73 | 1541 | return 0; |
1da177e4 | 1542 | } |
8ced425e | 1543 | EXPORT_SYMBOL_GPL(sk_attach_filter); |
1da177e4 | 1544 | |
538950a1 | 1545 | int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
89aa0758 | 1546 | { |
538950a1 | 1547 | struct bpf_prog *prog = __get_filter(fprog, sk); |
49b31e57 | 1548 | int err; |
89aa0758 | 1549 | |
538950a1 CG |
1550 | if (IS_ERR(prog)) |
1551 | return PTR_ERR(prog); | |
1552 | ||
1553 | err = __reuseport_attach_prog(prog, sk); | |
1554 | if (err < 0) { | |
1555 | __bpf_prog_release(prog); | |
1556 | return err; | |
1557 | } | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) | |
1563 | { | |
89aa0758 | 1564 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
538950a1 | 1565 | return ERR_PTR(-EPERM); |
89aa0758 | 1566 | |
113214be | 1567 | return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
538950a1 CG |
1568 | } |
1569 | ||
1570 | int sk_attach_bpf(u32 ufd, struct sock *sk) | |
1571 | { | |
1572 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1573 | int err; | |
1574 | ||
1575 | if (IS_ERR(prog)) | |
1576 | return PTR_ERR(prog); | |
1577 | ||
8ced425e | 1578 | err = __sk_attach_prog(prog, sk); |
49b31e57 | 1579 | if (err < 0) { |
89aa0758 | 1580 | bpf_prog_put(prog); |
49b31e57 | 1581 | return err; |
89aa0758 AS |
1582 | } |
1583 | ||
89aa0758 AS |
1584 | return 0; |
1585 | } | |
1586 | ||
538950a1 CG |
1587 | int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
1588 | { | |
1589 | struct bpf_prog *prog = __get_bpf(ufd, sk); | |
1590 | int err; | |
1591 | ||
1592 | if (IS_ERR(prog)) | |
1593 | return PTR_ERR(prog); | |
1594 | ||
1595 | err = __reuseport_attach_prog(prog, sk); | |
1596 | if (err < 0) { | |
1597 | bpf_prog_put(prog); | |
1598 | return err; | |
1599 | } | |
1600 | ||
1601 | return 0; | |
1602 | } | |
1603 | ||
21cafc1d DB |
1604 | struct bpf_scratchpad { |
1605 | union { | |
1606 | __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; | |
1607 | u8 buff[MAX_BPF_STACK]; | |
1608 | }; | |
1609 | }; | |
1610 | ||
1611 | static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); | |
91bc4822 | 1612 | |
5293efe6 DB |
1613 | static inline int __bpf_try_make_writable(struct sk_buff *skb, |
1614 | unsigned int write_len) | |
1615 | { | |
1616 | return skb_ensure_writable(skb, write_len); | |
1617 | } | |
1618 | ||
db58ba45 AS |
1619 | static inline int bpf_try_make_writable(struct sk_buff *skb, |
1620 | unsigned int write_len) | |
1621 | { | |
5293efe6 | 1622 | int err = __bpf_try_make_writable(skb, write_len); |
db58ba45 | 1623 | |
6aaae2b6 | 1624 | bpf_compute_data_pointers(skb); |
db58ba45 AS |
1625 | return err; |
1626 | } | |
1627 | ||
36bbef52 DB |
1628 | static int bpf_try_make_head_writable(struct sk_buff *skb) |
1629 | { | |
1630 | return bpf_try_make_writable(skb, skb_headlen(skb)); | |
1631 | } | |
1632 | ||
a2bfe6bf DB |
1633 | static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
1634 | { | |
1635 | if (skb_at_tc_ingress(skb)) | |
1636 | skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1637 | } | |
1638 | ||
8065694e DB |
1639 | static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
1640 | { | |
1641 | if (skb_at_tc_ingress(skb)) | |
1642 | skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); | |
1643 | } | |
1644 | ||
f3694e00 DB |
1645 | BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
1646 | const void *, from, u32, len, u64, flags) | |
608cd71a | 1647 | { |
608cd71a AS |
1648 | void *ptr; |
1649 | ||
8afd54c8 | 1650 | if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
781c53bc | 1651 | return -EINVAL; |
0ed661d5 | 1652 | if (unlikely(offset > 0xffff)) |
608cd71a | 1653 | return -EFAULT; |
db58ba45 | 1654 | if (unlikely(bpf_try_make_writable(skb, offset + len))) |
608cd71a AS |
1655 | return -EFAULT; |
1656 | ||
0ed661d5 | 1657 | ptr = skb->data + offset; |
781c53bc | 1658 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1659 | __skb_postpull_rcsum(skb, ptr, len, offset); |
608cd71a AS |
1660 | |
1661 | memcpy(ptr, from, len); | |
1662 | ||
781c53bc | 1663 | if (flags & BPF_F_RECOMPUTE_CSUM) |
479ffccc | 1664 | __skb_postpush_rcsum(skb, ptr, len, offset); |
8afd54c8 DB |
1665 | if (flags & BPF_F_INVALIDATE_HASH) |
1666 | skb_clear_hash(skb); | |
f8ffad69 | 1667 | |
608cd71a AS |
1668 | return 0; |
1669 | } | |
1670 | ||
577c50aa | 1671 | static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
608cd71a AS |
1672 | .func = bpf_skb_store_bytes, |
1673 | .gpl_only = false, | |
1674 | .ret_type = RET_INTEGER, | |
1675 | .arg1_type = ARG_PTR_TO_CTX, | |
1676 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1677 | .arg3_type = ARG_PTR_TO_MEM, |
1678 | .arg4_type = ARG_CONST_SIZE, | |
91bc4822 AS |
1679 | .arg5_type = ARG_ANYTHING, |
1680 | }; | |
1681 | ||
f3694e00 DB |
1682 | BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
1683 | void *, to, u32, len) | |
05c74e5e | 1684 | { |
05c74e5e DB |
1685 | void *ptr; |
1686 | ||
0ed661d5 | 1687 | if (unlikely(offset > 0xffff)) |
074f528e | 1688 | goto err_clear; |
05c74e5e DB |
1689 | |
1690 | ptr = skb_header_pointer(skb, offset, len, to); | |
1691 | if (unlikely(!ptr)) | |
074f528e | 1692 | goto err_clear; |
05c74e5e DB |
1693 | if (ptr != to) |
1694 | memcpy(to, ptr, len); | |
1695 | ||
1696 | return 0; | |
074f528e DB |
1697 | err_clear: |
1698 | memset(to, 0, len); | |
1699 | return -EFAULT; | |
05c74e5e DB |
1700 | } |
1701 | ||
577c50aa | 1702 | static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
05c74e5e DB |
1703 | .func = bpf_skb_load_bytes, |
1704 | .gpl_only = false, | |
1705 | .ret_type = RET_INTEGER, | |
1706 | .arg1_type = ARG_PTR_TO_CTX, | |
1707 | .arg2_type = ARG_ANYTHING, | |
39f19ebb AS |
1708 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
1709 | .arg4_type = ARG_CONST_SIZE, | |
05c74e5e DB |
1710 | }; |
1711 | ||
4e1ec56c DB |
1712 | BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, |
1713 | u32, offset, void *, to, u32, len, u32, start_header) | |
1714 | { | |
3eee1f75 DB |
1715 | u8 *end = skb_tail_pointer(skb); |
1716 | u8 *net = skb_network_header(skb); | |
1717 | u8 *mac = skb_mac_header(skb); | |
4e1ec56c DB |
1718 | u8 *ptr; |
1719 | ||
3eee1f75 | 1720 | if (unlikely(offset > 0xffff || len > (end - mac))) |
4e1ec56c DB |
1721 | goto err_clear; |
1722 | ||
1723 | switch (start_header) { | |
1724 | case BPF_HDR_START_MAC: | |
3eee1f75 | 1725 | ptr = mac + offset; |
4e1ec56c DB |
1726 | break; |
1727 | case BPF_HDR_START_NET: | |
3eee1f75 | 1728 | ptr = net + offset; |
4e1ec56c DB |
1729 | break; |
1730 | default: | |
1731 | goto err_clear; | |
1732 | } | |
1733 | ||
3eee1f75 | 1734 | if (likely(ptr >= mac && ptr + len <= end)) { |
4e1ec56c DB |
1735 | memcpy(to, ptr, len); |
1736 | return 0; | |
1737 | } | |
1738 | ||
1739 | err_clear: | |
1740 | memset(to, 0, len); | |
1741 | return -EFAULT; | |
1742 | } | |
1743 | ||
1744 | static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { | |
1745 | .func = bpf_skb_load_bytes_relative, | |
1746 | .gpl_only = false, | |
1747 | .ret_type = RET_INTEGER, | |
1748 | .arg1_type = ARG_PTR_TO_CTX, | |
1749 | .arg2_type = ARG_ANYTHING, | |
1750 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
1751 | .arg4_type = ARG_CONST_SIZE, | |
1752 | .arg5_type = ARG_ANYTHING, | |
1753 | }; | |
1754 | ||
36bbef52 DB |
1755 | BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
1756 | { | |
1757 | /* Idea is the following: should the needed direct read/write | |
1758 | * test fail during runtime, we can pull in more data and redo | |
1759 | * again, since implicitly, we invalidate previous checks here. | |
1760 | * | |
1761 | * Or, since we know how much we need to make read/writeable, | |
1762 | * this can be done once at the program beginning for direct | |
1763 | * access case. By this we overcome limitations of only current | |
1764 | * headroom being accessible. | |
1765 | */ | |
1766 | return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1767 | } | |
1768 | ||
1769 | static const struct bpf_func_proto bpf_skb_pull_data_proto = { | |
1770 | .func = bpf_skb_pull_data, | |
1771 | .gpl_only = false, | |
1772 | .ret_type = RET_INTEGER, | |
1773 | .arg1_type = ARG_PTR_TO_CTX, | |
1774 | .arg2_type = ARG_ANYTHING, | |
1775 | }; | |
1776 | ||
0ea488ff JF |
1777 | static inline int sk_skb_try_make_writable(struct sk_buff *skb, |
1778 | unsigned int write_len) | |
1779 | { | |
1780 | int err = __bpf_try_make_writable(skb, write_len); | |
1781 | ||
1782 | bpf_compute_data_end_sk_skb(skb); | |
1783 | return err; | |
1784 | } | |
1785 | ||
1786 | BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) | |
1787 | { | |
1788 | /* Idea is the following: should the needed direct read/write | |
1789 | * test fail during runtime, we can pull in more data and redo | |
1790 | * again, since implicitly, we invalidate previous checks here. | |
1791 | * | |
1792 | * Or, since we know how much we need to make read/writeable, | |
1793 | * this can be done once at the program beginning for direct | |
1794 | * access case. By this we overcome limitations of only current | |
1795 | * headroom being accessible. | |
1796 | */ | |
1797 | return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); | |
1798 | } | |
1799 | ||
1800 | static const struct bpf_func_proto sk_skb_pull_data_proto = { | |
1801 | .func = sk_skb_pull_data, | |
1802 | .gpl_only = false, | |
1803 | .ret_type = RET_INTEGER, | |
1804 | .arg1_type = ARG_PTR_TO_CTX, | |
1805 | .arg2_type = ARG_ANYTHING, | |
1806 | }; | |
1807 | ||
f3694e00 DB |
1808 | BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
1809 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1810 | { |
0ed661d5 | 1811 | __sum16 *ptr; |
91bc4822 | 1812 | |
781c53bc DB |
1813 | if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
1814 | return -EINVAL; | |
0ed661d5 | 1815 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1816 | return -EFAULT; |
0ed661d5 | 1817 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1818 | return -EFAULT; |
1819 | ||
0ed661d5 | 1820 | ptr = (__sum16 *)(skb->data + offset); |
781c53bc | 1821 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
8050c0f0 DB |
1822 | case 0: |
1823 | if (unlikely(from != 0)) | |
1824 | return -EINVAL; | |
1825 | ||
1826 | csum_replace_by_diff(ptr, to); | |
1827 | break; | |
91bc4822 AS |
1828 | case 2: |
1829 | csum_replace2(ptr, from, to); | |
1830 | break; | |
1831 | case 4: | |
1832 | csum_replace4(ptr, from, to); | |
1833 | break; | |
1834 | default: | |
1835 | return -EINVAL; | |
1836 | } | |
1837 | ||
91bc4822 AS |
1838 | return 0; |
1839 | } | |
1840 | ||
577c50aa | 1841 | static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
91bc4822 AS |
1842 | .func = bpf_l3_csum_replace, |
1843 | .gpl_only = false, | |
1844 | .ret_type = RET_INTEGER, | |
1845 | .arg1_type = ARG_PTR_TO_CTX, | |
1846 | .arg2_type = ARG_ANYTHING, | |
1847 | .arg3_type = ARG_ANYTHING, | |
1848 | .arg4_type = ARG_ANYTHING, | |
1849 | .arg5_type = ARG_ANYTHING, | |
1850 | }; | |
1851 | ||
f3694e00 DB |
1852 | BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
1853 | u64, from, u64, to, u64, flags) | |
91bc4822 | 1854 | { |
781c53bc | 1855 | bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
2f72959a | 1856 | bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
d1b662ad | 1857 | bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
0ed661d5 | 1858 | __sum16 *ptr; |
91bc4822 | 1859 | |
d1b662ad DB |
1860 | if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
1861 | BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) | |
781c53bc | 1862 | return -EINVAL; |
0ed661d5 | 1863 | if (unlikely(offset > 0xffff || offset & 1)) |
91bc4822 | 1864 | return -EFAULT; |
0ed661d5 | 1865 | if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
91bc4822 AS |
1866 | return -EFAULT; |
1867 | ||
0ed661d5 | 1868 | ptr = (__sum16 *)(skb->data + offset); |
d1b662ad | 1869 | if (is_mmzero && !do_mforce && !*ptr) |
2f72959a | 1870 | return 0; |
91bc4822 | 1871 | |
781c53bc | 1872 | switch (flags & BPF_F_HDR_FIELD_MASK) { |
7d672345 DB |
1873 | case 0: |
1874 | if (unlikely(from != 0)) | |
1875 | return -EINVAL; | |
1876 | ||
1877 | inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); | |
1878 | break; | |
91bc4822 AS |
1879 | case 2: |
1880 | inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); | |
1881 | break; | |
1882 | case 4: | |
1883 | inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); | |
1884 | break; | |
1885 | default: | |
1886 | return -EINVAL; | |
1887 | } | |
1888 | ||
2f72959a DB |
1889 | if (is_mmzero && !*ptr) |
1890 | *ptr = CSUM_MANGLED_0; | |
91bc4822 AS |
1891 | return 0; |
1892 | } | |
1893 | ||
577c50aa | 1894 | static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
91bc4822 AS |
1895 | .func = bpf_l4_csum_replace, |
1896 | .gpl_only = false, | |
1897 | .ret_type = RET_INTEGER, | |
1898 | .arg1_type = ARG_PTR_TO_CTX, | |
1899 | .arg2_type = ARG_ANYTHING, | |
1900 | .arg3_type = ARG_ANYTHING, | |
1901 | .arg4_type = ARG_ANYTHING, | |
1902 | .arg5_type = ARG_ANYTHING, | |
608cd71a AS |
1903 | }; |
1904 | ||
f3694e00 DB |
1905 | BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
1906 | __be32 *, to, u32, to_size, __wsum, seed) | |
7d672345 | 1907 | { |
21cafc1d | 1908 | struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
f3694e00 | 1909 | u32 diff_size = from_size + to_size; |
7d672345 DB |
1910 | int i, j = 0; |
1911 | ||
1912 | /* This is quite flexible, some examples: | |
1913 | * | |
1914 | * from_size == 0, to_size > 0, seed := csum --> pushing data | |
1915 | * from_size > 0, to_size == 0, seed := csum --> pulling data | |
1916 | * from_size > 0, to_size > 0, seed := 0 --> diffing data | |
1917 | * | |
1918 | * Even for diffing, from_size and to_size don't need to be equal. | |
1919 | */ | |
1920 | if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || | |
1921 | diff_size > sizeof(sp->diff))) | |
1922 | return -EINVAL; | |
1923 | ||
1924 | for (i = 0; i < from_size / sizeof(__be32); i++, j++) | |
1925 | sp->diff[j] = ~from[i]; | |
1926 | for (i = 0; i < to_size / sizeof(__be32); i++, j++) | |
1927 | sp->diff[j] = to[i]; | |
1928 | ||
1929 | return csum_partial(sp->diff, diff_size, seed); | |
1930 | } | |
1931 | ||
577c50aa | 1932 | static const struct bpf_func_proto bpf_csum_diff_proto = { |
7d672345 DB |
1933 | .func = bpf_csum_diff, |
1934 | .gpl_only = false, | |
36bbef52 | 1935 | .pkt_access = true, |
7d672345 | 1936 | .ret_type = RET_INTEGER, |
db1ac496 | 1937 | .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1938 | .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
db1ac496 | 1939 | .arg3_type = ARG_PTR_TO_MEM_OR_NULL, |
39f19ebb | 1940 | .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
7d672345 DB |
1941 | .arg5_type = ARG_ANYTHING, |
1942 | }; | |
1943 | ||
36bbef52 DB |
1944 | BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
1945 | { | |
1946 | /* The interface is to be used in combination with bpf_csum_diff() | |
1947 | * for direct packet writes. csum rotation for alignment as well | |
1948 | * as emulating csum_sub() can be done from the eBPF program. | |
1949 | */ | |
1950 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1951 | return (skb->csum = csum_add(skb->csum, csum)); | |
1952 | ||
1953 | return -ENOTSUPP; | |
1954 | } | |
1955 | ||
1956 | static const struct bpf_func_proto bpf_csum_update_proto = { | |
1957 | .func = bpf_csum_update, | |
1958 | .gpl_only = false, | |
1959 | .ret_type = RET_INTEGER, | |
1960 | .arg1_type = ARG_PTR_TO_CTX, | |
1961 | .arg2_type = ARG_ANYTHING, | |
1962 | }; | |
1963 | ||
a70b506e DB |
1964 | static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
1965 | { | |
a70b506e DB |
1966 | return dev_forward_skb(dev, skb); |
1967 | } | |
1968 | ||
4e3264d2 MKL |
1969 | static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
1970 | struct sk_buff *skb) | |
1971 | { | |
1972 | int ret = ____dev_forward_skb(dev, skb); | |
1973 | ||
1974 | if (likely(!ret)) { | |
1975 | skb->dev = dev; | |
1976 | ret = netif_rx(skb); | |
1977 | } | |
1978 | ||
1979 | return ret; | |
1980 | } | |
1981 | ||
a70b506e DB |
1982 | static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
1983 | { | |
1984 | int ret; | |
1985 | ||
1986 | if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) { | |
1987 | net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); | |
1988 | kfree_skb(skb); | |
1989 | return -ENETDOWN; | |
1990 | } | |
1991 | ||
1992 | skb->dev = dev; | |
1993 | ||
1994 | __this_cpu_inc(xmit_recursion); | |
1995 | ret = dev_queue_xmit(skb); | |
1996 | __this_cpu_dec(xmit_recursion); | |
1997 | ||
1998 | return ret; | |
1999 | } | |
2000 | ||
4e3264d2 MKL |
2001 | static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
2002 | u32 flags) | |
2003 | { | |
2004 | /* skb->mac_len is not set on normal egress */ | |
2005 | unsigned int mlen = skb->network_header - skb->mac_header; | |
2006 | ||
2007 | __skb_pull(skb, mlen); | |
2008 | ||
2009 | /* At ingress, the mac header has already been pulled once. | |
2010 | * At egress, skb_pospull_rcsum has to be done in case that | |
2011 | * the skb is originated from ingress (i.e. a forwarded skb) | |
2012 | * to ensure that rcsum starts at net header. | |
2013 | */ | |
2014 | if (!skb_at_tc_ingress(skb)) | |
2015 | skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); | |
2016 | skb_pop_mac_header(skb); | |
2017 | skb_reset_mac_len(skb); | |
2018 | return flags & BPF_F_INGRESS ? | |
2019 | __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); | |
2020 | } | |
2021 | ||
2022 | static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, | |
2023 | u32 flags) | |
2024 | { | |
3a0af8fd TG |
2025 | /* Verify that a link layer header is carried */ |
2026 | if (unlikely(skb->mac_header >= skb->network_header)) { | |
2027 | kfree_skb(skb); | |
2028 | return -ERANGE; | |
2029 | } | |
2030 | ||
4e3264d2 MKL |
2031 | bpf_push_mac_rcsum(skb); |
2032 | return flags & BPF_F_INGRESS ? | |
2033 | __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); | |
2034 | } | |
2035 | ||
2036 | static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, | |
2037 | u32 flags) | |
2038 | { | |
c491680f | 2039 | if (dev_is_mac_header_xmit(dev)) |
4e3264d2 | 2040 | return __bpf_redirect_common(skb, dev, flags); |
c491680f DB |
2041 | else |
2042 | return __bpf_redirect_no_mac(skb, dev, flags); | |
4e3264d2 MKL |
2043 | } |
2044 | ||
f3694e00 | 2045 | BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
3896d655 | 2046 | { |
3896d655 | 2047 | struct net_device *dev; |
36bbef52 DB |
2048 | struct sk_buff *clone; |
2049 | int ret; | |
3896d655 | 2050 | |
781c53bc DB |
2051 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2052 | return -EINVAL; | |
2053 | ||
3896d655 AS |
2054 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
2055 | if (unlikely(!dev)) | |
2056 | return -EINVAL; | |
2057 | ||
36bbef52 DB |
2058 | clone = skb_clone(skb, GFP_ATOMIC); |
2059 | if (unlikely(!clone)) | |
3896d655 AS |
2060 | return -ENOMEM; |
2061 | ||
36bbef52 DB |
2062 | /* For direct write, we need to keep the invariant that the skbs |
2063 | * we're dealing with need to be uncloned. Should uncloning fail | |
2064 | * here, we need to free the just generated clone to unclone once | |
2065 | * again. | |
2066 | */ | |
2067 | ret = bpf_try_make_head_writable(skb); | |
2068 | if (unlikely(ret)) { | |
2069 | kfree_skb(clone); | |
2070 | return -ENOMEM; | |
2071 | } | |
2072 | ||
4e3264d2 | 2073 | return __bpf_redirect(clone, dev, flags); |
3896d655 AS |
2074 | } |
2075 | ||
577c50aa | 2076 | static const struct bpf_func_proto bpf_clone_redirect_proto = { |
3896d655 AS |
2077 | .func = bpf_clone_redirect, |
2078 | .gpl_only = false, | |
2079 | .ret_type = RET_INTEGER, | |
2080 | .arg1_type = ARG_PTR_TO_CTX, | |
2081 | .arg2_type = ARG_ANYTHING, | |
2082 | .arg3_type = ARG_ANYTHING, | |
2083 | }; | |
2084 | ||
0b19cc0a TM |
2085 | DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); |
2086 | EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); | |
781c53bc | 2087 | |
f3694e00 | 2088 | BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
27b29f63 | 2089 | { |
0b19cc0a | 2090 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 | 2091 | |
781c53bc DB |
2092 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
2093 | return TC_ACT_SHOT; | |
2094 | ||
27b29f63 AS |
2095 | ri->ifindex = ifindex; |
2096 | ri->flags = flags; | |
781c53bc | 2097 | |
27b29f63 AS |
2098 | return TC_ACT_REDIRECT; |
2099 | } | |
2100 | ||
2101 | int skb_do_redirect(struct sk_buff *skb) | |
2102 | { | |
0b19cc0a | 2103 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
27b29f63 AS |
2104 | struct net_device *dev; |
2105 | ||
2106 | dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex); | |
2107 | ri->ifindex = 0; | |
2108 | if (unlikely(!dev)) { | |
2109 | kfree_skb(skb); | |
2110 | return -EINVAL; | |
2111 | } | |
2112 | ||
4e3264d2 | 2113 | return __bpf_redirect(skb, dev, ri->flags); |
27b29f63 AS |
2114 | } |
2115 | ||
577c50aa | 2116 | static const struct bpf_func_proto bpf_redirect_proto = { |
27b29f63 AS |
2117 | .func = bpf_redirect, |
2118 | .gpl_only = false, | |
2119 | .ret_type = RET_INTEGER, | |
2120 | .arg1_type = ARG_ANYTHING, | |
2121 | .arg2_type = ARG_ANYTHING, | |
2122 | }; | |
2123 | ||
81110384 JF |
2124 | BPF_CALL_4(bpf_sk_redirect_hash, struct sk_buff *, skb, |
2125 | struct bpf_map *, map, void *, key, u64, flags) | |
2126 | { | |
2127 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); | |
2128 | ||
2129 | /* If user passes invalid input drop the packet. */ | |
2130 | if (unlikely(flags & ~(BPF_F_INGRESS))) | |
2131 | return SK_DROP; | |
2132 | ||
2133 | tcb->bpf.flags = flags; | |
2134 | tcb->bpf.sk_redir = __sock_hash_lookup_elem(map, key); | |
2135 | if (!tcb->bpf.sk_redir) | |
2136 | return SK_DROP; | |
2137 | ||
2138 | return SK_PASS; | |
2139 | } | |
2140 | ||
2141 | static const struct bpf_func_proto bpf_sk_redirect_hash_proto = { | |
2142 | .func = bpf_sk_redirect_hash, | |
2143 | .gpl_only = false, | |
2144 | .ret_type = RET_INTEGER, | |
2145 | .arg1_type = ARG_PTR_TO_CTX, | |
2146 | .arg2_type = ARG_CONST_MAP_PTR, | |
2147 | .arg3_type = ARG_PTR_TO_MAP_KEY, | |
2148 | .arg4_type = ARG_ANYTHING, | |
2149 | }; | |
2150 | ||
34f79502 JF |
2151 | BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb, |
2152 | struct bpf_map *, map, u32, key, u64, flags) | |
174a79ff | 2153 | { |
34f79502 | 2154 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
174a79ff | 2155 | |
bfa64075 | 2156 | /* If user passes invalid input drop the packet. */ |
fa246693 | 2157 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
bfa64075 | 2158 | return SK_DROP; |
174a79ff | 2159 | |
34f79502 | 2160 | tcb->bpf.flags = flags; |
e5cd3abc JF |
2161 | tcb->bpf.sk_redir = __sock_map_lookup_elem(map, key); |
2162 | if (!tcb->bpf.sk_redir) | |
2163 | return SK_DROP; | |
174a79ff | 2164 | |
bfa64075 | 2165 | return SK_PASS; |
174a79ff JF |
2166 | } |
2167 | ||
34f79502 | 2168 | struct sock *do_sk_redirect_map(struct sk_buff *skb) |
174a79ff | 2169 | { |
34f79502 | 2170 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
174a79ff | 2171 | |
e5cd3abc | 2172 | return tcb->bpf.sk_redir; |
174a79ff JF |
2173 | } |
2174 | ||
2175 | static const struct bpf_func_proto bpf_sk_redirect_map_proto = { | |
2176 | .func = bpf_sk_redirect_map, | |
2177 | .gpl_only = false, | |
2178 | .ret_type = RET_INTEGER, | |
34f79502 JF |
2179 | .arg1_type = ARG_PTR_TO_CTX, |
2180 | .arg2_type = ARG_CONST_MAP_PTR, | |
174a79ff | 2181 | .arg3_type = ARG_ANYTHING, |
34f79502 | 2182 | .arg4_type = ARG_ANYTHING, |
174a79ff JF |
2183 | }; |
2184 | ||
81110384 JF |
2185 | BPF_CALL_4(bpf_msg_redirect_hash, struct sk_msg_buff *, msg, |
2186 | struct bpf_map *, map, void *, key, u64, flags) | |
2187 | { | |
2188 | /* If user passes invalid input drop the packet. */ | |
2189 | if (unlikely(flags & ~(BPF_F_INGRESS))) | |
2190 | return SK_DROP; | |
2191 | ||
2192 | msg->flags = flags; | |
2193 | msg->sk_redir = __sock_hash_lookup_elem(map, key); | |
2194 | if (!msg->sk_redir) | |
2195 | return SK_DROP; | |
2196 | ||
2197 | return SK_PASS; | |
2198 | } | |
2199 | ||
2200 | static const struct bpf_func_proto bpf_msg_redirect_hash_proto = { | |
2201 | .func = bpf_msg_redirect_hash, | |
2202 | .gpl_only = false, | |
2203 | .ret_type = RET_INTEGER, | |
2204 | .arg1_type = ARG_PTR_TO_CTX, | |
2205 | .arg2_type = ARG_CONST_MAP_PTR, | |
2206 | .arg3_type = ARG_PTR_TO_MAP_KEY, | |
2207 | .arg4_type = ARG_ANYTHING, | |
2208 | }; | |
2209 | ||
4f738adb JF |
2210 | BPF_CALL_4(bpf_msg_redirect_map, struct sk_msg_buff *, msg, |
2211 | struct bpf_map *, map, u32, key, u64, flags) | |
2212 | { | |
2213 | /* If user passes invalid input drop the packet. */ | |
8934ce2f | 2214 | if (unlikely(flags & ~(BPF_F_INGRESS))) |
4f738adb JF |
2215 | return SK_DROP; |
2216 | ||
4f738adb | 2217 | msg->flags = flags; |
e5cd3abc JF |
2218 | msg->sk_redir = __sock_map_lookup_elem(map, key); |
2219 | if (!msg->sk_redir) | |
2220 | return SK_DROP; | |
4f738adb JF |
2221 | |
2222 | return SK_PASS; | |
2223 | } | |
2224 | ||
2225 | struct sock *do_msg_redirect_map(struct sk_msg_buff *msg) | |
2226 | { | |
e5cd3abc | 2227 | return msg->sk_redir; |
4f738adb JF |
2228 | } |
2229 | ||
2230 | static const struct bpf_func_proto bpf_msg_redirect_map_proto = { | |
2231 | .func = bpf_msg_redirect_map, | |
2232 | .gpl_only = false, | |
2233 | .ret_type = RET_INTEGER, | |
2234 | .arg1_type = ARG_PTR_TO_CTX, | |
2235 | .arg2_type = ARG_CONST_MAP_PTR, | |
2236 | .arg3_type = ARG_ANYTHING, | |
2237 | .arg4_type = ARG_ANYTHING, | |
2238 | }; | |
2239 | ||
2a100317 JF |
2240 | BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg_buff *, msg, u32, bytes) |
2241 | { | |
2242 | msg->apply_bytes = bytes; | |
2243 | return 0; | |
2244 | } | |
2245 | ||
2246 | static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { | |
2247 | .func = bpf_msg_apply_bytes, | |
2248 | .gpl_only = false, | |
2249 | .ret_type = RET_INTEGER, | |
2250 | .arg1_type = ARG_PTR_TO_CTX, | |
2251 | .arg2_type = ARG_ANYTHING, | |
2252 | }; | |
2253 | ||
91843d54 JF |
2254 | BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg_buff *, msg, u32, bytes) |
2255 | { | |
2256 | msg->cork_bytes = bytes; | |
2257 | return 0; | |
2258 | } | |
2259 | ||
2260 | static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { | |
2261 | .func = bpf_msg_cork_bytes, | |
2262 | .gpl_only = false, | |
2263 | .ret_type = RET_INTEGER, | |
2264 | .arg1_type = ARG_PTR_TO_CTX, | |
2265 | .arg2_type = ARG_ANYTHING, | |
2266 | }; | |
2267 | ||
015632bb JF |
2268 | BPF_CALL_4(bpf_msg_pull_data, |
2269 | struct sk_msg_buff *, msg, u32, start, u32, end, u64, flags) | |
2270 | { | |
2271 | unsigned int len = 0, offset = 0, copy = 0; | |
2272 | struct scatterlist *sg = msg->sg_data; | |
2273 | int first_sg, last_sg, i, shift; | |
2274 | unsigned char *p, *to, *from; | |
2275 | int bytes = end - start; | |
2276 | struct page *page; | |
2277 | ||
2278 | if (unlikely(flags || end <= start)) | |
2279 | return -EINVAL; | |
2280 | ||
2281 | /* First find the starting scatterlist element */ | |
2282 | i = msg->sg_start; | |
2283 | do { | |
2284 | len = sg[i].length; | |
2285 | offset += len; | |
2286 | if (start < offset + len) | |
2287 | break; | |
2288 | i++; | |
2289 | if (i == MAX_SKB_FRAGS) | |
2290 | i = 0; | |
2291 | } while (i != msg->sg_end); | |
2292 | ||
2293 | if (unlikely(start >= offset + len)) | |
2294 | return -EINVAL; | |
2295 | ||
2296 | if (!msg->sg_copy[i] && bytes <= len) | |
2297 | goto out; | |
2298 | ||
2299 | first_sg = i; | |
2300 | ||
2301 | /* At this point we need to linearize multiple scatterlist | |
2302 | * elements or a single shared page. Either way we need to | |
2303 | * copy into a linear buffer exclusively owned by BPF. Then | |
2304 | * place the buffer in the scatterlist and fixup the original | |
2305 | * entries by removing the entries now in the linear buffer | |
2306 | * and shifting the remaining entries. For now we do not try | |
2307 | * to copy partial entries to avoid complexity of running out | |
2308 | * of sg_entry slots. The downside is reading a single byte | |
2309 | * will copy the entire sg entry. | |
2310 | */ | |
2311 | do { | |
2312 | copy += sg[i].length; | |
2313 | i++; | |
2314 | if (i == MAX_SKB_FRAGS) | |
2315 | i = 0; | |
2316 | if (bytes < copy) | |
2317 | break; | |
2318 | } while (i != msg->sg_end); | |
2319 | last_sg = i; | |
2320 | ||
2321 | if (unlikely(copy < end - start)) | |
2322 | return -EINVAL; | |
2323 | ||
2324 | page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC, get_order(copy)); | |
2325 | if (unlikely(!page)) | |
2326 | return -ENOMEM; | |
2327 | p = page_address(page); | |
2328 | offset = 0; | |
2329 | ||
2330 | i = first_sg; | |
2331 | do { | |
2332 | from = sg_virt(&sg[i]); | |
2333 | len = sg[i].length; | |
2334 | to = p + offset; | |
2335 | ||
2336 | memcpy(to, from, len); | |
2337 | offset += len; | |
2338 | sg[i].length = 0; | |
2339 | put_page(sg_page(&sg[i])); | |
2340 | ||
2341 | i++; | |
2342 | if (i == MAX_SKB_FRAGS) | |
2343 | i = 0; | |
2344 | } while (i != last_sg); | |
2345 | ||
2346 | sg[first_sg].length = copy; | |
2347 | sg_set_page(&sg[first_sg], page, copy, 0); | |
2348 | ||
2349 | /* To repair sg ring we need to shift entries. If we only | |
2350 | * had a single entry though we can just replace it and | |
2351 | * be done. Otherwise walk the ring and shift the entries. | |
2352 | */ | |
2353 | shift = last_sg - first_sg - 1; | |
2354 | if (!shift) | |
2355 | goto out; | |
2356 | ||
2357 | i = first_sg + 1; | |
2358 | do { | |
2359 | int move_from; | |
2360 | ||
2361 | if (i + shift >= MAX_SKB_FRAGS) | |
2362 | move_from = i + shift - MAX_SKB_FRAGS; | |
2363 | else | |
2364 | move_from = i + shift; | |
2365 | ||
2366 | if (move_from == msg->sg_end) | |
2367 | break; | |
2368 | ||
2369 | sg[i] = sg[move_from]; | |
2370 | sg[move_from].length = 0; | |
2371 | sg[move_from].page_link = 0; | |
2372 | sg[move_from].offset = 0; | |
2373 | ||
2374 | i++; | |
2375 | if (i == MAX_SKB_FRAGS) | |
2376 | i = 0; | |
2377 | } while (1); | |
2378 | msg->sg_end -= shift; | |
2379 | if (msg->sg_end < 0) | |
2380 | msg->sg_end += MAX_SKB_FRAGS; | |
2381 | out: | |
2382 | msg->data = sg_virt(&sg[i]) + start - offset; | |
2383 | msg->data_end = msg->data + bytes; | |
2384 | ||
2385 | return 0; | |
2386 | } | |
2387 | ||
2388 | static const struct bpf_func_proto bpf_msg_pull_data_proto = { | |
2389 | .func = bpf_msg_pull_data, | |
2390 | .gpl_only = false, | |
2391 | .ret_type = RET_INTEGER, | |
2392 | .arg1_type = ARG_PTR_TO_CTX, | |
2393 | .arg2_type = ARG_ANYTHING, | |
2394 | .arg3_type = ARG_ANYTHING, | |
2395 | .arg4_type = ARG_ANYTHING, | |
2396 | }; | |
2397 | ||
f3694e00 | 2398 | BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
8d20aabe | 2399 | { |
f3694e00 | 2400 | return task_get_classid(skb); |
8d20aabe DB |
2401 | } |
2402 | ||
2403 | static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { | |
2404 | .func = bpf_get_cgroup_classid, | |
2405 | .gpl_only = false, | |
2406 | .ret_type = RET_INTEGER, | |
2407 | .arg1_type = ARG_PTR_TO_CTX, | |
2408 | }; | |
2409 | ||
f3694e00 | 2410 | BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
c46646d0 | 2411 | { |
f3694e00 | 2412 | return dst_tclassid(skb); |
c46646d0 DB |
2413 | } |
2414 | ||
2415 | static const struct bpf_func_proto bpf_get_route_realm_proto = { | |
2416 | .func = bpf_get_route_realm, | |
2417 | .gpl_only = false, | |
2418 | .ret_type = RET_INTEGER, | |
2419 | .arg1_type = ARG_PTR_TO_CTX, | |
2420 | }; | |
2421 | ||
f3694e00 | 2422 | BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
13c5c240 DB |
2423 | { |
2424 | /* If skb_clear_hash() was called due to mangling, we can | |
2425 | * trigger SW recalculation here. Later access to hash | |
2426 | * can then use the inline skb->hash via context directly | |
2427 | * instead of calling this helper again. | |
2428 | */ | |
f3694e00 | 2429 | return skb_get_hash(skb); |
13c5c240 DB |
2430 | } |
2431 | ||
2432 | static const struct bpf_func_proto bpf_get_hash_recalc_proto = { | |
2433 | .func = bpf_get_hash_recalc, | |
2434 | .gpl_only = false, | |
2435 | .ret_type = RET_INTEGER, | |
2436 | .arg1_type = ARG_PTR_TO_CTX, | |
2437 | }; | |
2438 | ||
7a4b28c6 DB |
2439 | BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
2440 | { | |
2441 | /* After all direct packet write, this can be used once for | |
2442 | * triggering a lazy recalc on next skb_get_hash() invocation. | |
2443 | */ | |
2444 | skb_clear_hash(skb); | |
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | static const struct bpf_func_proto bpf_set_hash_invalid_proto = { | |
2449 | .func = bpf_set_hash_invalid, | |
2450 | .gpl_only = false, | |
2451 | .ret_type = RET_INTEGER, | |
2452 | .arg1_type = ARG_PTR_TO_CTX, | |
2453 | }; | |
2454 | ||
ded092cd DB |
2455 | BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
2456 | { | |
2457 | /* Set user specified hash as L4(+), so that it gets returned | |
2458 | * on skb_get_hash() call unless BPF prog later on triggers a | |
2459 | * skb_clear_hash(). | |
2460 | */ | |
2461 | __skb_set_sw_hash(skb, hash, true); | |
2462 | return 0; | |
2463 | } | |
2464 | ||
2465 | static const struct bpf_func_proto bpf_set_hash_proto = { | |
2466 | .func = bpf_set_hash, | |
2467 | .gpl_only = false, | |
2468 | .ret_type = RET_INTEGER, | |
2469 | .arg1_type = ARG_PTR_TO_CTX, | |
2470 | .arg2_type = ARG_ANYTHING, | |
2471 | }; | |
2472 | ||
f3694e00 DB |
2473 | BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
2474 | u16, vlan_tci) | |
4e10df9a | 2475 | { |
db58ba45 | 2476 | int ret; |
4e10df9a AS |
2477 | |
2478 | if (unlikely(vlan_proto != htons(ETH_P_8021Q) && | |
2479 | vlan_proto != htons(ETH_P_8021AD))) | |
2480 | vlan_proto = htons(ETH_P_8021Q); | |
2481 | ||
8065694e | 2482 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2483 | ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
8065694e DB |
2484 | bpf_pull_mac_rcsum(skb); |
2485 | ||
6aaae2b6 | 2486 | bpf_compute_data_pointers(skb); |
db58ba45 | 2487 | return ret; |
4e10df9a AS |
2488 | } |
2489 | ||
93731ef0 | 2490 | static const struct bpf_func_proto bpf_skb_vlan_push_proto = { |
4e10df9a AS |
2491 | .func = bpf_skb_vlan_push, |
2492 | .gpl_only = false, | |
2493 | .ret_type = RET_INTEGER, | |
2494 | .arg1_type = ARG_PTR_TO_CTX, | |
2495 | .arg2_type = ARG_ANYTHING, | |
2496 | .arg3_type = ARG_ANYTHING, | |
2497 | }; | |
2498 | ||
f3694e00 | 2499 | BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
4e10df9a | 2500 | { |
db58ba45 | 2501 | int ret; |
4e10df9a | 2502 | |
8065694e | 2503 | bpf_push_mac_rcsum(skb); |
db58ba45 | 2504 | ret = skb_vlan_pop(skb); |
8065694e DB |
2505 | bpf_pull_mac_rcsum(skb); |
2506 | ||
6aaae2b6 | 2507 | bpf_compute_data_pointers(skb); |
db58ba45 | 2508 | return ret; |
4e10df9a AS |
2509 | } |
2510 | ||
93731ef0 | 2511 | static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { |
4e10df9a AS |
2512 | .func = bpf_skb_vlan_pop, |
2513 | .gpl_only = false, | |
2514 | .ret_type = RET_INTEGER, | |
2515 | .arg1_type = ARG_PTR_TO_CTX, | |
2516 | }; | |
2517 | ||
6578171a DB |
2518 | static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
2519 | { | |
2520 | /* Caller already did skb_cow() with len as headroom, | |
2521 | * so no need to do it here. | |
2522 | */ | |
2523 | skb_push(skb, len); | |
2524 | memmove(skb->data, skb->data + len, off); | |
2525 | memset(skb->data + off, 0, len); | |
2526 | ||
2527 | /* No skb_postpush_rcsum(skb, skb->data + off, len) | |
2528 | * needed here as it does not change the skb->csum | |
2529 | * result for checksum complete when summing over | |
2530 | * zeroed blocks. | |
2531 | */ | |
2532 | return 0; | |
2533 | } | |
2534 | ||
2535 | static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) | |
2536 | { | |
2537 | /* skb_ensure_writable() is not needed here, as we're | |
2538 | * already working on an uncloned skb. | |
2539 | */ | |
2540 | if (unlikely(!pskb_may_pull(skb, off + len))) | |
2541 | return -ENOMEM; | |
2542 | ||
2543 | skb_postpull_rcsum(skb, skb->data + off, len); | |
2544 | memmove(skb->data + len, skb->data, off); | |
2545 | __skb_pull(skb, len); | |
2546 | ||
2547 | return 0; | |
2548 | } | |
2549 | ||
2550 | static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) | |
2551 | { | |
2552 | bool trans_same = skb->transport_header == skb->network_header; | |
2553 | int ret; | |
2554 | ||
2555 | /* There's no need for __skb_push()/__skb_pull() pair to | |
2556 | * get to the start of the mac header as we're guaranteed | |
2557 | * to always start from here under eBPF. | |
2558 | */ | |
2559 | ret = bpf_skb_generic_push(skb, off, len); | |
2560 | if (likely(!ret)) { | |
2561 | skb->mac_header -= len; | |
2562 | skb->network_header -= len; | |
2563 | if (trans_same) | |
2564 | skb->transport_header = skb->network_header; | |
2565 | } | |
2566 | ||
2567 | return ret; | |
2568 | } | |
2569 | ||
2570 | static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) | |
2571 | { | |
2572 | bool trans_same = skb->transport_header == skb->network_header; | |
2573 | int ret; | |
2574 | ||
2575 | /* Same here, __skb_push()/__skb_pull() pair not needed. */ | |
2576 | ret = bpf_skb_generic_pop(skb, off, len); | |
2577 | if (likely(!ret)) { | |
2578 | skb->mac_header += len; | |
2579 | skb->network_header += len; | |
2580 | if (trans_same) | |
2581 | skb->transport_header = skb->network_header; | |
2582 | } | |
2583 | ||
2584 | return ret; | |
2585 | } | |
2586 | ||
2587 | static int bpf_skb_proto_4_to_6(struct sk_buff *skb) | |
2588 | { | |
2589 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2590 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2591 | int ret; |
2592 | ||
d02f51cb DA |
2593 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2594 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2595 | return -ENOTSUPP; | |
2596 | ||
6578171a DB |
2597 | ret = skb_cow(skb, len_diff); |
2598 | if (unlikely(ret < 0)) | |
2599 | return ret; | |
2600 | ||
2601 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2602 | if (unlikely(ret < 0)) | |
2603 | return ret; | |
2604 | ||
2605 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2606 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2607 | ||
880388aa DM |
2608 | /* SKB_GSO_TCPV4 needs to be changed into |
2609 | * SKB_GSO_TCPV6. | |
6578171a | 2610 | */ |
d02f51cb DA |
2611 | if (shinfo->gso_type & SKB_GSO_TCPV4) { |
2612 | shinfo->gso_type &= ~SKB_GSO_TCPV4; | |
2613 | shinfo->gso_type |= SKB_GSO_TCPV6; | |
6578171a DB |
2614 | } |
2615 | ||
2616 | /* Due to IPv6 header, MSS needs to be downgraded. */ | |
d02f51cb | 2617 | skb_decrease_gso_size(shinfo, len_diff); |
6578171a | 2618 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2619 | shinfo->gso_type |= SKB_GSO_DODGY; |
2620 | shinfo->gso_segs = 0; | |
6578171a DB |
2621 | } |
2622 | ||
2623 | skb->protocol = htons(ETH_P_IPV6); | |
2624 | skb_clear_hash(skb); | |
2625 | ||
2626 | return 0; | |
2627 | } | |
2628 | ||
2629 | static int bpf_skb_proto_6_to_4(struct sk_buff *skb) | |
2630 | { | |
2631 | const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); | |
0daf4349 | 2632 | u32 off = skb_mac_header_len(skb); |
6578171a DB |
2633 | int ret; |
2634 | ||
d02f51cb DA |
2635 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2636 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2637 | return -ENOTSUPP; | |
2638 | ||
6578171a DB |
2639 | ret = skb_unclone(skb, GFP_ATOMIC); |
2640 | if (unlikely(ret < 0)) | |
2641 | return ret; | |
2642 | ||
2643 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2644 | if (unlikely(ret < 0)) | |
2645 | return ret; | |
2646 | ||
2647 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2648 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2649 | ||
880388aa DM |
2650 | /* SKB_GSO_TCPV6 needs to be changed into |
2651 | * SKB_GSO_TCPV4. | |
6578171a | 2652 | */ |
d02f51cb DA |
2653 | if (shinfo->gso_type & SKB_GSO_TCPV6) { |
2654 | shinfo->gso_type &= ~SKB_GSO_TCPV6; | |
2655 | shinfo->gso_type |= SKB_GSO_TCPV4; | |
6578171a DB |
2656 | } |
2657 | ||
2658 | /* Due to IPv4 header, MSS can be upgraded. */ | |
d02f51cb | 2659 | skb_increase_gso_size(shinfo, len_diff); |
6578171a | 2660 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2661 | shinfo->gso_type |= SKB_GSO_DODGY; |
2662 | shinfo->gso_segs = 0; | |
6578171a DB |
2663 | } |
2664 | ||
2665 | skb->protocol = htons(ETH_P_IP); | |
2666 | skb_clear_hash(skb); | |
2667 | ||
2668 | return 0; | |
2669 | } | |
2670 | ||
2671 | static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) | |
2672 | { | |
2673 | __be16 from_proto = skb->protocol; | |
2674 | ||
2675 | if (from_proto == htons(ETH_P_IP) && | |
2676 | to_proto == htons(ETH_P_IPV6)) | |
2677 | return bpf_skb_proto_4_to_6(skb); | |
2678 | ||
2679 | if (from_proto == htons(ETH_P_IPV6) && | |
2680 | to_proto == htons(ETH_P_IP)) | |
2681 | return bpf_skb_proto_6_to_4(skb); | |
2682 | ||
2683 | return -ENOTSUPP; | |
2684 | } | |
2685 | ||
f3694e00 DB |
2686 | BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
2687 | u64, flags) | |
6578171a | 2688 | { |
6578171a DB |
2689 | int ret; |
2690 | ||
2691 | if (unlikely(flags)) | |
2692 | return -EINVAL; | |
2693 | ||
2694 | /* General idea is that this helper does the basic groundwork | |
2695 | * needed for changing the protocol, and eBPF program fills the | |
2696 | * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() | |
2697 | * and other helpers, rather than passing a raw buffer here. | |
2698 | * | |
2699 | * The rationale is to keep this minimal and without a need to | |
2700 | * deal with raw packet data. F.e. even if we would pass buffers | |
2701 | * here, the program still needs to call the bpf_lX_csum_replace() | |
2702 | * helpers anyway. Plus, this way we keep also separation of | |
2703 | * concerns, since f.e. bpf_skb_store_bytes() should only take | |
2704 | * care of stores. | |
2705 | * | |
2706 | * Currently, additional options and extension header space are | |
2707 | * not supported, but flags register is reserved so we can adapt | |
2708 | * that. For offloads, we mark packet as dodgy, so that headers | |
2709 | * need to be verified first. | |
2710 | */ | |
2711 | ret = bpf_skb_proto_xlat(skb, proto); | |
6aaae2b6 | 2712 | bpf_compute_data_pointers(skb); |
6578171a DB |
2713 | return ret; |
2714 | } | |
2715 | ||
2716 | static const struct bpf_func_proto bpf_skb_change_proto_proto = { | |
2717 | .func = bpf_skb_change_proto, | |
2718 | .gpl_only = false, | |
2719 | .ret_type = RET_INTEGER, | |
2720 | .arg1_type = ARG_PTR_TO_CTX, | |
2721 | .arg2_type = ARG_ANYTHING, | |
2722 | .arg3_type = ARG_ANYTHING, | |
2723 | }; | |
2724 | ||
f3694e00 | 2725 | BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
d2485c42 | 2726 | { |
d2485c42 | 2727 | /* We only allow a restricted subset to be changed for now. */ |
45c7fffa DB |
2728 | if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
2729 | !skb_pkt_type_ok(pkt_type))) | |
d2485c42 DB |
2730 | return -EINVAL; |
2731 | ||
2732 | skb->pkt_type = pkt_type; | |
2733 | return 0; | |
2734 | } | |
2735 | ||
2736 | static const struct bpf_func_proto bpf_skb_change_type_proto = { | |
2737 | .func = bpf_skb_change_type, | |
2738 | .gpl_only = false, | |
2739 | .ret_type = RET_INTEGER, | |
2740 | .arg1_type = ARG_PTR_TO_CTX, | |
2741 | .arg2_type = ARG_ANYTHING, | |
2742 | }; | |
2743 | ||
2be7e212 DB |
2744 | static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
2745 | { | |
2746 | switch (skb->protocol) { | |
2747 | case htons(ETH_P_IP): | |
2748 | return sizeof(struct iphdr); | |
2749 | case htons(ETH_P_IPV6): | |
2750 | return sizeof(struct ipv6hdr); | |
2751 | default: | |
2752 | return ~0U; | |
2753 | } | |
2754 | } | |
2755 | ||
2756 | static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff) | |
2757 | { | |
2758 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2759 | int ret; | |
2760 | ||
d02f51cb DA |
2761 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2762 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2763 | return -ENOTSUPP; | |
2764 | ||
2be7e212 DB |
2765 | ret = skb_cow(skb, len_diff); |
2766 | if (unlikely(ret < 0)) | |
2767 | return ret; | |
2768 | ||
2769 | ret = bpf_skb_net_hdr_push(skb, off, len_diff); | |
2770 | if (unlikely(ret < 0)) | |
2771 | return ret; | |
2772 | ||
2773 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2774 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2775 | ||
2be7e212 | 2776 | /* Due to header grow, MSS needs to be downgraded. */ |
d02f51cb | 2777 | skb_decrease_gso_size(shinfo, len_diff); |
2be7e212 | 2778 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2779 | shinfo->gso_type |= SKB_GSO_DODGY; |
2780 | shinfo->gso_segs = 0; | |
2be7e212 DB |
2781 | } |
2782 | ||
2783 | return 0; | |
2784 | } | |
2785 | ||
2786 | static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff) | |
2787 | { | |
2788 | u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb); | |
2789 | int ret; | |
2790 | ||
d02f51cb DA |
2791 | /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */ |
2792 | if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb))) | |
2793 | return -ENOTSUPP; | |
2794 | ||
2be7e212 DB |
2795 | ret = skb_unclone(skb, GFP_ATOMIC); |
2796 | if (unlikely(ret < 0)) | |
2797 | return ret; | |
2798 | ||
2799 | ret = bpf_skb_net_hdr_pop(skb, off, len_diff); | |
2800 | if (unlikely(ret < 0)) | |
2801 | return ret; | |
2802 | ||
2803 | if (skb_is_gso(skb)) { | |
d02f51cb DA |
2804 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
2805 | ||
2be7e212 | 2806 | /* Due to header shrink, MSS can be upgraded. */ |
d02f51cb | 2807 | skb_increase_gso_size(shinfo, len_diff); |
2be7e212 | 2808 | /* Header must be checked, and gso_segs recomputed. */ |
d02f51cb DA |
2809 | shinfo->gso_type |= SKB_GSO_DODGY; |
2810 | shinfo->gso_segs = 0; | |
2be7e212 DB |
2811 | } |
2812 | ||
2813 | return 0; | |
2814 | } | |
2815 | ||
2816 | static u32 __bpf_skb_max_len(const struct sk_buff *skb) | |
2817 | { | |
0c6bc6e5 JF |
2818 | return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : |
2819 | SKB_MAX_ALLOC; | |
2be7e212 DB |
2820 | } |
2821 | ||
2822 | static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff) | |
2823 | { | |
2824 | bool trans_same = skb->transport_header == skb->network_header; | |
2825 | u32 len_cur, len_diff_abs = abs(len_diff); | |
2826 | u32 len_min = bpf_skb_net_base_len(skb); | |
2827 | u32 len_max = __bpf_skb_max_len(skb); | |
2828 | __be16 proto = skb->protocol; | |
2829 | bool shrink = len_diff < 0; | |
2830 | int ret; | |
2831 | ||
2832 | if (unlikely(len_diff_abs > 0xfffU)) | |
2833 | return -EFAULT; | |
2834 | if (unlikely(proto != htons(ETH_P_IP) && | |
2835 | proto != htons(ETH_P_IPV6))) | |
2836 | return -ENOTSUPP; | |
2837 | ||
2838 | len_cur = skb->len - skb_network_offset(skb); | |
2839 | if (skb_transport_header_was_set(skb) && !trans_same) | |
2840 | len_cur = skb_network_header_len(skb); | |
2841 | if ((shrink && (len_diff_abs >= len_cur || | |
2842 | len_cur - len_diff_abs < len_min)) || | |
2843 | (!shrink && (skb->len + len_diff_abs > len_max && | |
2844 | !skb_is_gso(skb)))) | |
2845 | return -ENOTSUPP; | |
2846 | ||
2847 | ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) : | |
2848 | bpf_skb_net_grow(skb, len_diff_abs); | |
2849 | ||
6aaae2b6 | 2850 | bpf_compute_data_pointers(skb); |
e4a6a342 | 2851 | return ret; |
2be7e212 DB |
2852 | } |
2853 | ||
2854 | BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, | |
2855 | u32, mode, u64, flags) | |
2856 | { | |
2857 | if (unlikely(flags)) | |
2858 | return -EINVAL; | |
2859 | if (likely(mode == BPF_ADJ_ROOM_NET)) | |
2860 | return bpf_skb_adjust_net(skb, len_diff); | |
2861 | ||
2862 | return -ENOTSUPP; | |
2863 | } | |
2864 | ||
2865 | static const struct bpf_func_proto bpf_skb_adjust_room_proto = { | |
2866 | .func = bpf_skb_adjust_room, | |
2867 | .gpl_only = false, | |
2868 | .ret_type = RET_INTEGER, | |
2869 | .arg1_type = ARG_PTR_TO_CTX, | |
2870 | .arg2_type = ARG_ANYTHING, | |
2871 | .arg3_type = ARG_ANYTHING, | |
2872 | .arg4_type = ARG_ANYTHING, | |
2873 | }; | |
2874 | ||
5293efe6 DB |
2875 | static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
2876 | { | |
2877 | u32 min_len = skb_network_offset(skb); | |
2878 | ||
2879 | if (skb_transport_header_was_set(skb)) | |
2880 | min_len = skb_transport_offset(skb); | |
2881 | if (skb->ip_summed == CHECKSUM_PARTIAL) | |
2882 | min_len = skb_checksum_start_offset(skb) + | |
2883 | skb->csum_offset + sizeof(__sum16); | |
2884 | return min_len; | |
2885 | } | |
2886 | ||
5293efe6 DB |
2887 | static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
2888 | { | |
2889 | unsigned int old_len = skb->len; | |
2890 | int ret; | |
2891 | ||
2892 | ret = __skb_grow_rcsum(skb, new_len); | |
2893 | if (!ret) | |
2894 | memset(skb->data + old_len, 0, new_len - old_len); | |
2895 | return ret; | |
2896 | } | |
2897 | ||
2898 | static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) | |
2899 | { | |
2900 | return __skb_trim_rcsum(skb, new_len); | |
2901 | } | |
2902 | ||
0ea488ff JF |
2903 | static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, |
2904 | u64 flags) | |
5293efe6 | 2905 | { |
5293efe6 DB |
2906 | u32 max_len = __bpf_skb_max_len(skb); |
2907 | u32 min_len = __bpf_skb_min_len(skb); | |
5293efe6 DB |
2908 | int ret; |
2909 | ||
2910 | if (unlikely(flags || new_len > max_len || new_len < min_len)) | |
2911 | return -EINVAL; | |
2912 | if (skb->encapsulation) | |
2913 | return -ENOTSUPP; | |
2914 | ||
2915 | /* The basic idea of this helper is that it's performing the | |
2916 | * needed work to either grow or trim an skb, and eBPF program | |
2917 | * rewrites the rest via helpers like bpf_skb_store_bytes(), | |
2918 | * bpf_lX_csum_replace() and others rather than passing a raw | |
2919 | * buffer here. This one is a slow path helper and intended | |
2920 | * for replies with control messages. | |
2921 | * | |
2922 | * Like in bpf_skb_change_proto(), we want to keep this rather | |
2923 | * minimal and without protocol specifics so that we are able | |
2924 | * to separate concerns as in bpf_skb_store_bytes() should only | |
2925 | * be the one responsible for writing buffers. | |
2926 | * | |
2927 | * It's really expected to be a slow path operation here for | |
2928 | * control message replies, so we're implicitly linearizing, | |
2929 | * uncloning and drop offloads from the skb by this. | |
2930 | */ | |
2931 | ret = __bpf_try_make_writable(skb, skb->len); | |
2932 | if (!ret) { | |
2933 | if (new_len > skb->len) | |
2934 | ret = bpf_skb_grow_rcsum(skb, new_len); | |
2935 | else if (new_len < skb->len) | |
2936 | ret = bpf_skb_trim_rcsum(skb, new_len); | |
2937 | if (!ret && skb_is_gso(skb)) | |
2938 | skb_gso_reset(skb); | |
2939 | } | |
0ea488ff JF |
2940 | return ret; |
2941 | } | |
2942 | ||
2943 | BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, | |
2944 | u64, flags) | |
2945 | { | |
2946 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
5293efe6 | 2947 | |
6aaae2b6 | 2948 | bpf_compute_data_pointers(skb); |
5293efe6 DB |
2949 | return ret; |
2950 | } | |
2951 | ||
2952 | static const struct bpf_func_proto bpf_skb_change_tail_proto = { | |
2953 | .func = bpf_skb_change_tail, | |
2954 | .gpl_only = false, | |
2955 | .ret_type = RET_INTEGER, | |
2956 | .arg1_type = ARG_PTR_TO_CTX, | |
2957 | .arg2_type = ARG_ANYTHING, | |
2958 | .arg3_type = ARG_ANYTHING, | |
2959 | }; | |
2960 | ||
0ea488ff | 2961 | BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
3a0af8fd | 2962 | u64, flags) |
0ea488ff JF |
2963 | { |
2964 | int ret = __bpf_skb_change_tail(skb, new_len, flags); | |
2965 | ||
2966 | bpf_compute_data_end_sk_skb(skb); | |
2967 | return ret; | |
2968 | } | |
2969 | ||
2970 | static const struct bpf_func_proto sk_skb_change_tail_proto = { | |
2971 | .func = sk_skb_change_tail, | |
2972 | .gpl_only = false, | |
2973 | .ret_type = RET_INTEGER, | |
2974 | .arg1_type = ARG_PTR_TO_CTX, | |
2975 | .arg2_type = ARG_ANYTHING, | |
2976 | .arg3_type = ARG_ANYTHING, | |
2977 | }; | |
2978 | ||
2979 | static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, | |
2980 | u64 flags) | |
3a0af8fd TG |
2981 | { |
2982 | u32 max_len = __bpf_skb_max_len(skb); | |
2983 | u32 new_len = skb->len + head_room; | |
2984 | int ret; | |
2985 | ||
2986 | if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || | |
2987 | new_len < skb->len)) | |
2988 | return -EINVAL; | |
2989 | ||
2990 | ret = skb_cow(skb, head_room); | |
2991 | if (likely(!ret)) { | |
2992 | /* Idea for this helper is that we currently only | |
2993 | * allow to expand on mac header. This means that | |
2994 | * skb->protocol network header, etc, stay as is. | |
2995 | * Compared to bpf_skb_change_tail(), we're more | |
2996 | * flexible due to not needing to linearize or | |
2997 | * reset GSO. Intention for this helper is to be | |
2998 | * used by an L3 skb that needs to push mac header | |
2999 | * for redirection into L2 device. | |
3000 | */ | |
3001 | __skb_push(skb, head_room); | |
3002 | memset(skb->data, 0, head_room); | |
3003 | skb_reset_mac_header(skb); | |
3004 | } | |
3005 | ||
0ea488ff JF |
3006 | return ret; |
3007 | } | |
3008 | ||
3009 | BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, | |
3010 | u64, flags) | |
3011 | { | |
3012 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3013 | ||
6aaae2b6 | 3014 | bpf_compute_data_pointers(skb); |
0ea488ff | 3015 | return ret; |
3a0af8fd TG |
3016 | } |
3017 | ||
3018 | static const struct bpf_func_proto bpf_skb_change_head_proto = { | |
3019 | .func = bpf_skb_change_head, | |
3020 | .gpl_only = false, | |
3021 | .ret_type = RET_INTEGER, | |
3022 | .arg1_type = ARG_PTR_TO_CTX, | |
3023 | .arg2_type = ARG_ANYTHING, | |
3024 | .arg3_type = ARG_ANYTHING, | |
3025 | }; | |
3026 | ||
0ea488ff JF |
3027 | BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, |
3028 | u64, flags) | |
3029 | { | |
3030 | int ret = __bpf_skb_change_head(skb, head_room, flags); | |
3031 | ||
3032 | bpf_compute_data_end_sk_skb(skb); | |
3033 | return ret; | |
3034 | } | |
3035 | ||
3036 | static const struct bpf_func_proto sk_skb_change_head_proto = { | |
3037 | .func = sk_skb_change_head, | |
3038 | .gpl_only = false, | |
3039 | .ret_type = RET_INTEGER, | |
3040 | .arg1_type = ARG_PTR_TO_CTX, | |
3041 | .arg2_type = ARG_ANYTHING, | |
3042 | .arg3_type = ARG_ANYTHING, | |
3043 | }; | |
de8f3a83 DB |
3044 | static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) |
3045 | { | |
3046 | return xdp_data_meta_unsupported(xdp) ? 0 : | |
3047 | xdp->data - xdp->data_meta; | |
3048 | } | |
3049 | ||
17bedab2 MKL |
3050 | BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
3051 | { | |
6dfb970d | 3052 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 | 3053 | unsigned long metalen = xdp_get_metalen(xdp); |
97e19cce | 3054 | void *data_start = xdp_frame_end + metalen; |
17bedab2 MKL |
3055 | void *data = xdp->data + offset; |
3056 | ||
de8f3a83 | 3057 | if (unlikely(data < data_start || |
17bedab2 MKL |
3058 | data > xdp->data_end - ETH_HLEN)) |
3059 | return -EINVAL; | |
3060 | ||
de8f3a83 DB |
3061 | if (metalen) |
3062 | memmove(xdp->data_meta + offset, | |
3063 | xdp->data_meta, metalen); | |
3064 | xdp->data_meta += offset; | |
17bedab2 MKL |
3065 | xdp->data = data; |
3066 | ||
3067 | return 0; | |
3068 | } | |
3069 | ||
3070 | static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { | |
3071 | .func = bpf_xdp_adjust_head, | |
3072 | .gpl_only = false, | |
3073 | .ret_type = RET_INTEGER, | |
3074 | .arg1_type = ARG_PTR_TO_CTX, | |
3075 | .arg2_type = ARG_ANYTHING, | |
3076 | }; | |
3077 | ||
b32cc5b9 NS |
3078 | BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) |
3079 | { | |
3080 | void *data_end = xdp->data_end + offset; | |
3081 | ||
3082 | /* only shrinking is allowed for now. */ | |
3083 | if (unlikely(offset >= 0)) | |
3084 | return -EINVAL; | |
3085 | ||
3086 | if (unlikely(data_end < xdp->data + ETH_HLEN)) | |
3087 | return -EINVAL; | |
3088 | ||
3089 | xdp->data_end = data_end; | |
3090 | ||
3091 | return 0; | |
3092 | } | |
3093 | ||
3094 | static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { | |
3095 | .func = bpf_xdp_adjust_tail, | |
3096 | .gpl_only = false, | |
3097 | .ret_type = RET_INTEGER, | |
3098 | .arg1_type = ARG_PTR_TO_CTX, | |
3099 | .arg2_type = ARG_ANYTHING, | |
3100 | }; | |
3101 | ||
de8f3a83 DB |
3102 | BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) |
3103 | { | |
97e19cce | 3104 | void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
de8f3a83 DB |
3105 | void *meta = xdp->data_meta + offset; |
3106 | unsigned long metalen = xdp->data - meta; | |
3107 | ||
3108 | if (xdp_data_meta_unsupported(xdp)) | |
3109 | return -ENOTSUPP; | |
97e19cce | 3110 | if (unlikely(meta < xdp_frame_end || |
de8f3a83 DB |
3111 | meta > xdp->data)) |
3112 | return -EINVAL; | |
3113 | if (unlikely((metalen & (sizeof(__u32) - 1)) || | |
3114 | (metalen > 32))) | |
3115 | return -EACCES; | |
3116 | ||
3117 | xdp->data_meta = meta; | |
3118 | ||
3119 | return 0; | |
3120 | } | |
3121 | ||
3122 | static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { | |
3123 | .func = bpf_xdp_adjust_meta, | |
3124 | .gpl_only = false, | |
3125 | .ret_type = RET_INTEGER, | |
3126 | .arg1_type = ARG_PTR_TO_CTX, | |
3127 | .arg2_type = ARG_ANYTHING, | |
3128 | }; | |
3129 | ||
11393cc9 JF |
3130 | static int __bpf_tx_xdp(struct net_device *dev, |
3131 | struct bpf_map *map, | |
3132 | struct xdp_buff *xdp, | |
3133 | u32 index) | |
814abfab | 3134 | { |
44fa2dbd | 3135 | struct xdp_frame *xdpf; |
d8d7218a | 3136 | int err, sent; |
11393cc9 JF |
3137 | |
3138 | if (!dev->netdev_ops->ndo_xdp_xmit) { | |
11393cc9 | 3139 | return -EOPNOTSUPP; |
814abfab | 3140 | } |
11393cc9 | 3141 | |
d8d7218a TM |
3142 | err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data); |
3143 | if (unlikely(err)) | |
3144 | return err; | |
3145 | ||
44fa2dbd JDB |
3146 | xdpf = convert_to_xdp_frame(xdp); |
3147 | if (unlikely(!xdpf)) | |
3148 | return -EOVERFLOW; | |
3149 | ||
1e67575a | 3150 | sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH); |
735fc405 JDB |
3151 | if (sent <= 0) |
3152 | return sent; | |
9c270af3 JDB |
3153 | return 0; |
3154 | } | |
3155 | ||
3156 | static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, | |
3157 | struct bpf_map *map, | |
3158 | struct xdp_buff *xdp, | |
3159 | u32 index) | |
3160 | { | |
3161 | int err; | |
3162 | ||
1b1a251c BT |
3163 | switch (map->map_type) { |
3164 | case BPF_MAP_TYPE_DEVMAP: { | |
67f29e07 | 3165 | struct bpf_dtab_netdev *dst = fwd; |
9c270af3 | 3166 | |
38edddb8 | 3167 | err = dev_map_enqueue(dst, xdp, dev_rx); |
9c270af3 JDB |
3168 | if (err) |
3169 | return err; | |
11393cc9 | 3170 | __dev_map_insert_ctx(map, index); |
1b1a251c BT |
3171 | break; |
3172 | } | |
3173 | case BPF_MAP_TYPE_CPUMAP: { | |
9c270af3 JDB |
3174 | struct bpf_cpu_map_entry *rcpu = fwd; |
3175 | ||
3176 | err = cpu_map_enqueue(rcpu, xdp, dev_rx); | |
3177 | if (err) | |
3178 | return err; | |
3179 | __cpu_map_insert_ctx(map, index); | |
1b1a251c BT |
3180 | break; |
3181 | } | |
3182 | case BPF_MAP_TYPE_XSKMAP: { | |
3183 | struct xdp_sock *xs = fwd; | |
3184 | ||
3185 | err = __xsk_map_redirect(map, xdp, xs); | |
3186 | return err; | |
3187 | } | |
3188 | default: | |
3189 | break; | |
9c270af3 | 3190 | } |
e4a8e817 | 3191 | return 0; |
814abfab JF |
3192 | } |
3193 | ||
11393cc9 JF |
3194 | void xdp_do_flush_map(void) |
3195 | { | |
0b19cc0a | 3196 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
11393cc9 JF |
3197 | struct bpf_map *map = ri->map_to_flush; |
3198 | ||
11393cc9 | 3199 | ri->map_to_flush = NULL; |
9c270af3 JDB |
3200 | if (map) { |
3201 | switch (map->map_type) { | |
3202 | case BPF_MAP_TYPE_DEVMAP: | |
3203 | __dev_map_flush(map); | |
3204 | break; | |
3205 | case BPF_MAP_TYPE_CPUMAP: | |
3206 | __cpu_map_flush(map); | |
3207 | break; | |
1b1a251c BT |
3208 | case BPF_MAP_TYPE_XSKMAP: |
3209 | __xsk_map_flush(map); | |
3210 | break; | |
9c270af3 JDB |
3211 | default: |
3212 | break; | |
3213 | } | |
3214 | } | |
11393cc9 JF |
3215 | } |
3216 | EXPORT_SYMBOL_GPL(xdp_do_flush_map); | |
3217 | ||
9c270af3 JDB |
3218 | static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) |
3219 | { | |
3220 | switch (map->map_type) { | |
3221 | case BPF_MAP_TYPE_DEVMAP: | |
3222 | return __dev_map_lookup_elem(map, index); | |
3223 | case BPF_MAP_TYPE_CPUMAP: | |
3224 | return __cpu_map_lookup_elem(map, index); | |
1b1a251c BT |
3225 | case BPF_MAP_TYPE_XSKMAP: |
3226 | return __xsk_map_lookup_elem(map, index); | |
9c270af3 JDB |
3227 | default: |
3228 | return NULL; | |
3229 | } | |
3230 | } | |
3231 | ||
7c300131 DB |
3232 | static inline bool xdp_map_invalid(const struct bpf_prog *xdp_prog, |
3233 | unsigned long aux) | |
3234 | { | |
3235 | return (unsigned long)xdp_prog->aux != aux; | |
3236 | } | |
3237 | ||
e4a8e817 DB |
3238 | static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, |
3239 | struct bpf_prog *xdp_prog) | |
97f91a7c | 3240 | { |
0b19cc0a | 3241 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
7c300131 | 3242 | unsigned long map_owner = ri->map_owner; |
97f91a7c | 3243 | struct bpf_map *map = ri->map; |
11393cc9 | 3244 | u32 index = ri->ifindex; |
9c270af3 | 3245 | void *fwd = NULL; |
4c03bdd7 | 3246 | int err; |
97f91a7c JF |
3247 | |
3248 | ri->ifindex = 0; | |
3249 | ri->map = NULL; | |
7c300131 | 3250 | ri->map_owner = 0; |
109980b8 | 3251 | |
7c300131 | 3252 | if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) { |
96c5508e JDB |
3253 | err = -EFAULT; |
3254 | map = NULL; | |
3255 | goto err; | |
3256 | } | |
97f91a7c | 3257 | |
9c270af3 | 3258 | fwd = __xdp_map_lookup_elem(map, index); |
4c03bdd7 JDB |
3259 | if (!fwd) { |
3260 | err = -EINVAL; | |
f5836ca5 | 3261 | goto err; |
4c03bdd7 | 3262 | } |
e4a8e817 | 3263 | if (ri->map_to_flush && ri->map_to_flush != map) |
11393cc9 JF |
3264 | xdp_do_flush_map(); |
3265 | ||
9c270af3 | 3266 | err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index); |
f5836ca5 JDB |
3267 | if (unlikely(err)) |
3268 | goto err; | |
3269 | ||
3270 | ri->map_to_flush = map; | |
59a30896 | 3271 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
f5836ca5 JDB |
3272 | return 0; |
3273 | err: | |
59a30896 | 3274 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
97f91a7c JF |
3275 | return err; |
3276 | } | |
3277 | ||
5acaee0a JF |
3278 | int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
3279 | struct bpf_prog *xdp_prog) | |
814abfab | 3280 | { |
0b19cc0a | 3281 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
5acaee0a | 3282 | struct net_device *fwd; |
eb48d682 | 3283 | u32 index = ri->ifindex; |
4c03bdd7 | 3284 | int err; |
814abfab | 3285 | |
97f91a7c JF |
3286 | if (ri->map) |
3287 | return xdp_do_redirect_map(dev, xdp, xdp_prog); | |
3288 | ||
eb48d682 | 3289 | fwd = dev_get_by_index_rcu(dev_net(dev), index); |
814abfab | 3290 | ri->ifindex = 0; |
5acaee0a | 3291 | if (unlikely(!fwd)) { |
4c03bdd7 | 3292 | err = -EINVAL; |
f5836ca5 | 3293 | goto err; |
814abfab JF |
3294 | } |
3295 | ||
4c03bdd7 | 3296 | err = __bpf_tx_xdp(fwd, NULL, xdp, 0); |
f5836ca5 JDB |
3297 | if (unlikely(err)) |
3298 | goto err; | |
3299 | ||
3300 | _trace_xdp_redirect(dev, xdp_prog, index); | |
3301 | return 0; | |
3302 | err: | |
3303 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); | |
4c03bdd7 | 3304 | return err; |
814abfab JF |
3305 | } |
3306 | EXPORT_SYMBOL_GPL(xdp_do_redirect); | |
3307 | ||
c060bc61 XS |
3308 | static int xdp_do_generic_redirect_map(struct net_device *dev, |
3309 | struct sk_buff *skb, | |
02671e23 | 3310 | struct xdp_buff *xdp, |
c060bc61 | 3311 | struct bpf_prog *xdp_prog) |
6103aa96 | 3312 | { |
0b19cc0a | 3313 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
7c300131 | 3314 | unsigned long map_owner = ri->map_owner; |
96c5508e | 3315 | struct bpf_map *map = ri->map; |
eb48d682 | 3316 | u32 index = ri->ifindex; |
02671e23 | 3317 | void *fwd = NULL; |
2facaad6 | 3318 | int err = 0; |
6103aa96 | 3319 | |
6103aa96 | 3320 | ri->ifindex = 0; |
96c5508e | 3321 | ri->map = NULL; |
7c300131 | 3322 | ri->map_owner = 0; |
96c5508e | 3323 | |
9c270af3 JDB |
3324 | if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) { |
3325 | err = -EFAULT; | |
3326 | map = NULL; | |
3327 | goto err; | |
96c5508e | 3328 | } |
9c270af3 | 3329 | fwd = __xdp_map_lookup_elem(map, index); |
2facaad6 JDB |
3330 | if (unlikely(!fwd)) { |
3331 | err = -EINVAL; | |
f5836ca5 | 3332 | goto err; |
6103aa96 JF |
3333 | } |
3334 | ||
9c270af3 | 3335 | if (map->map_type == BPF_MAP_TYPE_DEVMAP) { |
6d5fc195 TM |
3336 | struct bpf_dtab_netdev *dst = fwd; |
3337 | ||
3338 | err = dev_map_generic_redirect(dst, skb, xdp_prog); | |
3339 | if (unlikely(err)) | |
9c270af3 | 3340 | goto err; |
02671e23 BT |
3341 | } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { |
3342 | struct xdp_sock *xs = fwd; | |
3343 | ||
3344 | err = xsk_generic_rcv(xs, xdp); | |
3345 | if (err) | |
3346 | goto err; | |
3347 | consume_skb(skb); | |
9c270af3 JDB |
3348 | } else { |
3349 | /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ | |
3350 | err = -EBADRQC; | |
f5836ca5 | 3351 | goto err; |
2facaad6 | 3352 | } |
6103aa96 | 3353 | |
9c270af3 JDB |
3354 | _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
3355 | return 0; | |
3356 | err: | |
3357 | _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); | |
3358 | return err; | |
3359 | } | |
3360 | ||
3361 | int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, | |
02671e23 | 3362 | struct xdp_buff *xdp, struct bpf_prog *xdp_prog) |
9c270af3 | 3363 | { |
0b19cc0a | 3364 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
9c270af3 JDB |
3365 | u32 index = ri->ifindex; |
3366 | struct net_device *fwd; | |
3367 | int err = 0; | |
3368 | ||
3369 | if (ri->map) | |
02671e23 | 3370 | return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog); |
9c270af3 JDB |
3371 | |
3372 | ri->ifindex = 0; | |
3373 | fwd = dev_get_by_index_rcu(dev_net(dev), index); | |
3374 | if (unlikely(!fwd)) { | |
3375 | err = -EINVAL; | |
f5836ca5 | 3376 | goto err; |
2facaad6 JDB |
3377 | } |
3378 | ||
d8d7218a TM |
3379 | err = xdp_ok_fwd_dev(fwd, skb->len); |
3380 | if (unlikely(err)) | |
9c270af3 JDB |
3381 | goto err; |
3382 | ||
2facaad6 | 3383 | skb->dev = fwd; |
9c270af3 | 3384 | _trace_xdp_redirect(dev, xdp_prog, index); |
02671e23 | 3385 | generic_xdp_tx(skb, xdp_prog); |
f5836ca5 JDB |
3386 | return 0; |
3387 | err: | |
9c270af3 | 3388 | _trace_xdp_redirect_err(dev, xdp_prog, index, err); |
2facaad6 | 3389 | return err; |
6103aa96 JF |
3390 | } |
3391 | EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); | |
3392 | ||
814abfab JF |
3393 | BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
3394 | { | |
0b19cc0a | 3395 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
814abfab JF |
3396 | |
3397 | if (unlikely(flags)) | |
3398 | return XDP_ABORTED; | |
3399 | ||
3400 | ri->ifindex = ifindex; | |
3401 | ri->flags = flags; | |
109980b8 | 3402 | ri->map = NULL; |
7c300131 | 3403 | ri->map_owner = 0; |
e4a8e817 | 3404 | |
814abfab JF |
3405 | return XDP_REDIRECT; |
3406 | } | |
3407 | ||
3408 | static const struct bpf_func_proto bpf_xdp_redirect_proto = { | |
3409 | .func = bpf_xdp_redirect, | |
3410 | .gpl_only = false, | |
3411 | .ret_type = RET_INTEGER, | |
3412 | .arg1_type = ARG_ANYTHING, | |
3413 | .arg2_type = ARG_ANYTHING, | |
3414 | }; | |
3415 | ||
109980b8 | 3416 | BPF_CALL_4(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags, |
7c300131 | 3417 | unsigned long, map_owner) |
e4a8e817 | 3418 | { |
0b19cc0a | 3419 | struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
e4a8e817 DB |
3420 | |
3421 | if (unlikely(flags)) | |
3422 | return XDP_ABORTED; | |
3423 | ||
3424 | ri->ifindex = ifindex; | |
3425 | ri->flags = flags; | |
3426 | ri->map = map; | |
109980b8 | 3427 | ri->map_owner = map_owner; |
e4a8e817 DB |
3428 | |
3429 | return XDP_REDIRECT; | |
3430 | } | |
3431 | ||
109980b8 DB |
3432 | /* Note, arg4 is hidden from users and populated by the verifier |
3433 | * with the right pointer. | |
3434 | */ | |
e4a8e817 DB |
3435 | static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { |
3436 | .func = bpf_xdp_redirect_map, | |
3437 | .gpl_only = false, | |
3438 | .ret_type = RET_INTEGER, | |
3439 | .arg1_type = ARG_CONST_MAP_PTR, | |
3440 | .arg2_type = ARG_ANYTHING, | |
3441 | .arg3_type = ARG_ANYTHING, | |
3442 | }; | |
3443 | ||
555c8a86 | 3444 | static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
aa7145c1 | 3445 | unsigned long off, unsigned long len) |
555c8a86 | 3446 | { |
aa7145c1 | 3447 | void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
555c8a86 DB |
3448 | |
3449 | if (unlikely(!ptr)) | |
3450 | return len; | |
3451 | if (ptr != dst_buff) | |
3452 | memcpy(dst_buff, ptr, len); | |
3453 | ||
3454 | return 0; | |
3455 | } | |
3456 | ||
f3694e00 DB |
3457 | BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
3458 | u64, flags, void *, meta, u64, meta_size) | |
555c8a86 | 3459 | { |
555c8a86 | 3460 | u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
555c8a86 DB |
3461 | |
3462 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
3463 | return -EINVAL; | |
3464 | if (unlikely(skb_size > skb->len)) | |
3465 | return -EFAULT; | |
3466 | ||
3467 | return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, | |
3468 | bpf_skb_copy); | |
3469 | } | |
3470 | ||
3471 | static const struct bpf_func_proto bpf_skb_event_output_proto = { | |
3472 | .func = bpf_skb_event_output, | |
3473 | .gpl_only = true, | |
3474 | .ret_type = RET_INTEGER, | |
3475 | .arg1_type = ARG_PTR_TO_CTX, | |
3476 | .arg2_type = ARG_CONST_MAP_PTR, | |
3477 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 3478 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 3479 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
555c8a86 DB |
3480 | }; |
3481 | ||
c6c33454 DB |
3482 | static unsigned short bpf_tunnel_key_af(u64 flags) |
3483 | { | |
3484 | return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; | |
3485 | } | |
3486 | ||
f3694e00 DB |
3487 | BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
3488 | u32, size, u64, flags) | |
d3aa45ce | 3489 | { |
c6c33454 DB |
3490 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3491 | u8 compat[sizeof(struct bpf_tunnel_key)]; | |
074f528e DB |
3492 | void *to_orig = to; |
3493 | int err; | |
d3aa45ce | 3494 | |
074f528e DB |
3495 | if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
3496 | err = -EINVAL; | |
3497 | goto err_clear; | |
3498 | } | |
3499 | if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { | |
3500 | err = -EPROTO; | |
3501 | goto err_clear; | |
3502 | } | |
c6c33454 | 3503 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
074f528e | 3504 | err = -EINVAL; |
c6c33454 | 3505 | switch (size) { |
4018ab18 | 3506 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3507 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
4018ab18 | 3508 | goto set_compat; |
c6c33454 DB |
3509 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3510 | /* Fixup deprecated structure layouts here, so we have | |
3511 | * a common path later on. | |
3512 | */ | |
3513 | if (ip_tunnel_info_af(info) != AF_INET) | |
074f528e | 3514 | goto err_clear; |
4018ab18 | 3515 | set_compat: |
c6c33454 DB |
3516 | to = (struct bpf_tunnel_key *)compat; |
3517 | break; | |
3518 | default: | |
074f528e | 3519 | goto err_clear; |
c6c33454 DB |
3520 | } |
3521 | } | |
d3aa45ce AS |
3522 | |
3523 | to->tunnel_id = be64_to_cpu(info->key.tun_id); | |
c6c33454 DB |
3524 | to->tunnel_tos = info->key.tos; |
3525 | to->tunnel_ttl = info->key.ttl; | |
1fbc2e0c | 3526 | to->tunnel_ext = 0; |
c6c33454 | 3527 | |
4018ab18 | 3528 | if (flags & BPF_F_TUNINFO_IPV6) { |
c6c33454 DB |
3529 | memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
3530 | sizeof(to->remote_ipv6)); | |
4018ab18 DB |
3531 | to->tunnel_label = be32_to_cpu(info->key.label); |
3532 | } else { | |
c6c33454 | 3533 | to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
1fbc2e0c DB |
3534 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
3535 | to->tunnel_label = 0; | |
4018ab18 | 3536 | } |
c6c33454 DB |
3537 | |
3538 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) | |
074f528e | 3539 | memcpy(to_orig, to, size); |
d3aa45ce AS |
3540 | |
3541 | return 0; | |
074f528e DB |
3542 | err_clear: |
3543 | memset(to_orig, 0, size); | |
3544 | return err; | |
d3aa45ce AS |
3545 | } |
3546 | ||
577c50aa | 3547 | static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
d3aa45ce AS |
3548 | .func = bpf_skb_get_tunnel_key, |
3549 | .gpl_only = false, | |
3550 | .ret_type = RET_INTEGER, | |
3551 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3552 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3553 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3554 | .arg4_type = ARG_ANYTHING, |
3555 | }; | |
3556 | ||
f3694e00 | 3557 | BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
14ca0751 | 3558 | { |
14ca0751 | 3559 | const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
074f528e | 3560 | int err; |
14ca0751 DB |
3561 | |
3562 | if (unlikely(!info || | |
074f528e DB |
3563 | !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
3564 | err = -ENOENT; | |
3565 | goto err_clear; | |
3566 | } | |
3567 | if (unlikely(size < info->options_len)) { | |
3568 | err = -ENOMEM; | |
3569 | goto err_clear; | |
3570 | } | |
14ca0751 DB |
3571 | |
3572 | ip_tunnel_info_opts_get(to, info); | |
074f528e DB |
3573 | if (size > info->options_len) |
3574 | memset(to + info->options_len, 0, size - info->options_len); | |
14ca0751 DB |
3575 | |
3576 | return info->options_len; | |
074f528e DB |
3577 | err_clear: |
3578 | memset(to, 0, size); | |
3579 | return err; | |
14ca0751 DB |
3580 | } |
3581 | ||
3582 | static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { | |
3583 | .func = bpf_skb_get_tunnel_opt, | |
3584 | .gpl_only = false, | |
3585 | .ret_type = RET_INTEGER, | |
3586 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3587 | .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
3588 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3589 | }; |
3590 | ||
d3aa45ce AS |
3591 | static struct metadata_dst __percpu *md_dst; |
3592 | ||
f3694e00 DB |
3593 | BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
3594 | const struct bpf_tunnel_key *, from, u32, size, u64, flags) | |
d3aa45ce | 3595 | { |
d3aa45ce | 3596 | struct metadata_dst *md = this_cpu_ptr(md_dst); |
c6c33454 | 3597 | u8 compat[sizeof(struct bpf_tunnel_key)]; |
d3aa45ce AS |
3598 | struct ip_tunnel_info *info; |
3599 | ||
22080870 | 3600 | if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
77a5196a | 3601 | BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) |
d3aa45ce | 3602 | return -EINVAL; |
c6c33454 DB |
3603 | if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
3604 | switch (size) { | |
4018ab18 | 3605 | case offsetof(struct bpf_tunnel_key, tunnel_label): |
c0e760c9 | 3606 | case offsetof(struct bpf_tunnel_key, tunnel_ext): |
c6c33454 DB |
3607 | case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
3608 | /* Fixup deprecated structure layouts here, so we have | |
3609 | * a common path later on. | |
3610 | */ | |
3611 | memcpy(compat, from, size); | |
3612 | memset(compat + size, 0, sizeof(compat) - size); | |
f3694e00 | 3613 | from = (const struct bpf_tunnel_key *) compat; |
c6c33454 DB |
3614 | break; |
3615 | default: | |
3616 | return -EINVAL; | |
3617 | } | |
3618 | } | |
c0e760c9 DB |
3619 | if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
3620 | from->tunnel_ext)) | |
4018ab18 | 3621 | return -EINVAL; |
d3aa45ce AS |
3622 | |
3623 | skb_dst_drop(skb); | |
3624 | dst_hold((struct dst_entry *) md); | |
3625 | skb_dst_set(skb, (struct dst_entry *) md); | |
3626 | ||
3627 | info = &md->u.tun_info; | |
5540fbf4 | 3628 | memset(info, 0, sizeof(*info)); |
d3aa45ce | 3629 | info->mode = IP_TUNNEL_INFO_TX; |
c6c33454 | 3630 | |
db3c6139 | 3631 | info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
22080870 DB |
3632 | if (flags & BPF_F_DONT_FRAGMENT) |
3633 | info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; | |
792f3dd6 WT |
3634 | if (flags & BPF_F_ZERO_CSUM_TX) |
3635 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
77a5196a WT |
3636 | if (flags & BPF_F_SEQ_NUMBER) |
3637 | info->key.tun_flags |= TUNNEL_SEQ; | |
22080870 | 3638 | |
d3aa45ce | 3639 | info->key.tun_id = cpu_to_be64(from->tunnel_id); |
c6c33454 DB |
3640 | info->key.tos = from->tunnel_tos; |
3641 | info->key.ttl = from->tunnel_ttl; | |
3642 | ||
3643 | if (flags & BPF_F_TUNINFO_IPV6) { | |
3644 | info->mode |= IP_TUNNEL_INFO_IPV6; | |
3645 | memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, | |
3646 | sizeof(from->remote_ipv6)); | |
4018ab18 DB |
3647 | info->key.label = cpu_to_be32(from->tunnel_label) & |
3648 | IPV6_FLOWLABEL_MASK; | |
c6c33454 DB |
3649 | } else { |
3650 | info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); | |
3651 | } | |
d3aa45ce AS |
3652 | |
3653 | return 0; | |
3654 | } | |
3655 | ||
577c50aa | 3656 | static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
d3aa45ce AS |
3657 | .func = bpf_skb_set_tunnel_key, |
3658 | .gpl_only = false, | |
3659 | .ret_type = RET_INTEGER, | |
3660 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3661 | .arg2_type = ARG_PTR_TO_MEM, |
3662 | .arg3_type = ARG_CONST_SIZE, | |
d3aa45ce AS |
3663 | .arg4_type = ARG_ANYTHING, |
3664 | }; | |
3665 | ||
f3694e00 DB |
3666 | BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
3667 | const u8 *, from, u32, size) | |
14ca0751 | 3668 | { |
14ca0751 DB |
3669 | struct ip_tunnel_info *info = skb_tunnel_info(skb); |
3670 | const struct metadata_dst *md = this_cpu_ptr(md_dst); | |
3671 | ||
3672 | if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) | |
3673 | return -EINVAL; | |
fca5fdf6 | 3674 | if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
14ca0751 DB |
3675 | return -ENOMEM; |
3676 | ||
256c87c1 | 3677 | ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); |
14ca0751 DB |
3678 | |
3679 | return 0; | |
3680 | } | |
3681 | ||
3682 | static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { | |
3683 | .func = bpf_skb_set_tunnel_opt, | |
3684 | .gpl_only = false, | |
3685 | .ret_type = RET_INTEGER, | |
3686 | .arg1_type = ARG_PTR_TO_CTX, | |
39f19ebb AS |
3687 | .arg2_type = ARG_PTR_TO_MEM, |
3688 | .arg3_type = ARG_CONST_SIZE, | |
14ca0751 DB |
3689 | }; |
3690 | ||
3691 | static const struct bpf_func_proto * | |
3692 | bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) | |
d3aa45ce AS |
3693 | { |
3694 | if (!md_dst) { | |
d66f2b91 JK |
3695 | struct metadata_dst __percpu *tmp; |
3696 | ||
3697 | tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, | |
3698 | METADATA_IP_TUNNEL, | |
3699 | GFP_KERNEL); | |
3700 | if (!tmp) | |
d3aa45ce | 3701 | return NULL; |
d66f2b91 JK |
3702 | if (cmpxchg(&md_dst, NULL, tmp)) |
3703 | metadata_dst_free_percpu(tmp); | |
d3aa45ce | 3704 | } |
14ca0751 DB |
3705 | |
3706 | switch (which) { | |
3707 | case BPF_FUNC_skb_set_tunnel_key: | |
3708 | return &bpf_skb_set_tunnel_key_proto; | |
3709 | case BPF_FUNC_skb_set_tunnel_opt: | |
3710 | return &bpf_skb_set_tunnel_opt_proto; | |
3711 | default: | |
3712 | return NULL; | |
3713 | } | |
d3aa45ce AS |
3714 | } |
3715 | ||
f3694e00 DB |
3716 | BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
3717 | u32, idx) | |
4a482f34 | 3718 | { |
4a482f34 MKL |
3719 | struct bpf_array *array = container_of(map, struct bpf_array, map); |
3720 | struct cgroup *cgrp; | |
3721 | struct sock *sk; | |
4a482f34 | 3722 | |
2d48c5f9 | 3723 | sk = skb_to_full_sk(skb); |
4a482f34 MKL |
3724 | if (!sk || !sk_fullsock(sk)) |
3725 | return -ENOENT; | |
f3694e00 | 3726 | if (unlikely(idx >= array->map.max_entries)) |
4a482f34 MKL |
3727 | return -E2BIG; |
3728 | ||
f3694e00 | 3729 | cgrp = READ_ONCE(array->ptrs[idx]); |
4a482f34 MKL |
3730 | if (unlikely(!cgrp)) |
3731 | return -EAGAIN; | |
3732 | ||
54fd9c2d | 3733 | return sk_under_cgroup_hierarchy(sk, cgrp); |
4a482f34 MKL |
3734 | } |
3735 | ||
747ea55e DB |
3736 | static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
3737 | .func = bpf_skb_under_cgroup, | |
4a482f34 MKL |
3738 | .gpl_only = false, |
3739 | .ret_type = RET_INTEGER, | |
3740 | .arg1_type = ARG_PTR_TO_CTX, | |
3741 | .arg2_type = ARG_CONST_MAP_PTR, | |
3742 | .arg3_type = ARG_ANYTHING, | |
3743 | }; | |
4a482f34 | 3744 | |
cb20b08e DB |
3745 | #ifdef CONFIG_SOCK_CGROUP_DATA |
3746 | BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) | |
3747 | { | |
3748 | struct sock *sk = skb_to_full_sk(skb); | |
3749 | struct cgroup *cgrp; | |
3750 | ||
3751 | if (!sk || !sk_fullsock(sk)) | |
3752 | return 0; | |
3753 | ||
3754 | cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); | |
3755 | return cgrp->kn->id.id; | |
3756 | } | |
3757 | ||
3758 | static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { | |
3759 | .func = bpf_skb_cgroup_id, | |
3760 | .gpl_only = false, | |
3761 | .ret_type = RET_INTEGER, | |
3762 | .arg1_type = ARG_PTR_TO_CTX, | |
3763 | }; | |
3764 | #endif | |
3765 | ||
4de16969 DB |
3766 | static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
3767 | unsigned long off, unsigned long len) | |
3768 | { | |
3769 | memcpy(dst_buff, src_buff + off, len); | |
3770 | return 0; | |
3771 | } | |
3772 | ||
f3694e00 DB |
3773 | BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
3774 | u64, flags, void *, meta, u64, meta_size) | |
4de16969 | 3775 | { |
4de16969 | 3776 | u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
4de16969 DB |
3777 | |
3778 | if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) | |
3779 | return -EINVAL; | |
3780 | if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) | |
3781 | return -EFAULT; | |
3782 | ||
9c471370 MKL |
3783 | return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
3784 | xdp_size, bpf_xdp_copy); | |
4de16969 DB |
3785 | } |
3786 | ||
3787 | static const struct bpf_func_proto bpf_xdp_event_output_proto = { | |
3788 | .func = bpf_xdp_event_output, | |
3789 | .gpl_only = true, | |
3790 | .ret_type = RET_INTEGER, | |
3791 | .arg1_type = ARG_PTR_TO_CTX, | |
3792 | .arg2_type = ARG_CONST_MAP_PTR, | |
3793 | .arg3_type = ARG_ANYTHING, | |
39f19ebb | 3794 | .arg4_type = ARG_PTR_TO_MEM, |
1728a4f2 | 3795 | .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
4de16969 DB |
3796 | }; |
3797 | ||
91b8270f CF |
3798 | BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
3799 | { | |
3800 | return skb->sk ? sock_gen_cookie(skb->sk) : 0; | |
3801 | } | |
3802 | ||
3803 | static const struct bpf_func_proto bpf_get_socket_cookie_proto = { | |
3804 | .func = bpf_get_socket_cookie, | |
3805 | .gpl_only = false, | |
3806 | .ret_type = RET_INTEGER, | |
3807 | .arg1_type = ARG_PTR_TO_CTX, | |
3808 | }; | |
3809 | ||
d692f113 AI |
3810 | BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) |
3811 | { | |
3812 | return sock_gen_cookie(ctx->sk); | |
3813 | } | |
3814 | ||
3815 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { | |
3816 | .func = bpf_get_socket_cookie_sock_addr, | |
3817 | .gpl_only = false, | |
3818 | .ret_type = RET_INTEGER, | |
3819 | .arg1_type = ARG_PTR_TO_CTX, | |
3820 | }; | |
3821 | ||
3822 | BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) | |
3823 | { | |
3824 | return sock_gen_cookie(ctx->sk); | |
3825 | } | |
3826 | ||
3827 | static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { | |
3828 | .func = bpf_get_socket_cookie_sock_ops, | |
3829 | .gpl_only = false, | |
3830 | .ret_type = RET_INTEGER, | |
3831 | .arg1_type = ARG_PTR_TO_CTX, | |
3832 | }; | |
3833 | ||
6acc5c29 CF |
3834 | BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
3835 | { | |
3836 | struct sock *sk = sk_to_full_sk(skb->sk); | |
3837 | kuid_t kuid; | |
3838 | ||
3839 | if (!sk || !sk_fullsock(sk)) | |
3840 | return overflowuid; | |
3841 | kuid = sock_net_uid(sock_net(sk), sk); | |
3842 | return from_kuid_munged(sock_net(sk)->user_ns, kuid); | |
3843 | } | |
3844 | ||
3845 | static const struct bpf_func_proto bpf_get_socket_uid_proto = { | |
3846 | .func = bpf_get_socket_uid, | |
3847 | .gpl_only = false, | |
3848 | .ret_type = RET_INTEGER, | |
3849 | .arg1_type = ARG_PTR_TO_CTX, | |
3850 | }; | |
3851 | ||
8c4b4c7e LB |
3852 | BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
3853 | int, level, int, optname, char *, optval, int, optlen) | |
3854 | { | |
3855 | struct sock *sk = bpf_sock->sk; | |
3856 | int ret = 0; | |
3857 | int val; | |
3858 | ||
3859 | if (!sk_fullsock(sk)) | |
3860 | return -EINVAL; | |
3861 | ||
3862 | if (level == SOL_SOCKET) { | |
3863 | if (optlen != sizeof(int)) | |
3864 | return -EINVAL; | |
3865 | val = *((int *)optval); | |
3866 | ||
3867 | /* Only some socketops are supported */ | |
3868 | switch (optname) { | |
3869 | case SO_RCVBUF: | |
3870 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
3871 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); | |
3872 | break; | |
3873 | case SO_SNDBUF: | |
3874 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
3875 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); | |
3876 | break; | |
3877 | case SO_MAX_PACING_RATE: | |
3878 | sk->sk_max_pacing_rate = val; | |
3879 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
3880 | sk->sk_max_pacing_rate); | |
3881 | break; | |
3882 | case SO_PRIORITY: | |
3883 | sk->sk_priority = val; | |
3884 | break; | |
3885 | case SO_RCVLOWAT: | |
3886 | if (val < 0) | |
3887 | val = INT_MAX; | |
3888 | sk->sk_rcvlowat = val ? : 1; | |
3889 | break; | |
3890 | case SO_MARK: | |
3891 | sk->sk_mark = val; | |
3892 | break; | |
3893 | default: | |
3894 | ret = -EINVAL; | |
3895 | } | |
a5192c52 | 3896 | #ifdef CONFIG_INET |
6f5c39fa NS |
3897 | } else if (level == SOL_IP) { |
3898 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
3899 | return -EINVAL; | |
3900 | ||
3901 | val = *((int *)optval); | |
3902 | /* Only some options are supported */ | |
3903 | switch (optname) { | |
3904 | case IP_TOS: | |
3905 | if (val < -1 || val > 0xff) { | |
3906 | ret = -EINVAL; | |
3907 | } else { | |
3908 | struct inet_sock *inet = inet_sk(sk); | |
3909 | ||
3910 | if (val == -1) | |
3911 | val = 0; | |
3912 | inet->tos = val; | |
3913 | } | |
3914 | break; | |
3915 | default: | |
3916 | ret = -EINVAL; | |
3917 | } | |
6f9bd3d7 LB |
3918 | #if IS_ENABLED(CONFIG_IPV6) |
3919 | } else if (level == SOL_IPV6) { | |
3920 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
3921 | return -EINVAL; | |
3922 | ||
3923 | val = *((int *)optval); | |
3924 | /* Only some options are supported */ | |
3925 | switch (optname) { | |
3926 | case IPV6_TCLASS: | |
3927 | if (val < -1 || val > 0xff) { | |
3928 | ret = -EINVAL; | |
3929 | } else { | |
3930 | struct ipv6_pinfo *np = inet6_sk(sk); | |
3931 | ||
3932 | if (val == -1) | |
3933 | val = 0; | |
3934 | np->tclass = val; | |
3935 | } | |
3936 | break; | |
3937 | default: | |
3938 | ret = -EINVAL; | |
3939 | } | |
3940 | #endif | |
8c4b4c7e LB |
3941 | } else if (level == SOL_TCP && |
3942 | sk->sk_prot->setsockopt == tcp_setsockopt) { | |
91b5b21c LB |
3943 | if (optname == TCP_CONGESTION) { |
3944 | char name[TCP_CA_NAME_MAX]; | |
ebfa00c5 | 3945 | bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; |
91b5b21c LB |
3946 | |
3947 | strncpy(name, optval, min_t(long, optlen, | |
3948 | TCP_CA_NAME_MAX-1)); | |
3949 | name[TCP_CA_NAME_MAX-1] = 0; | |
6f9bd3d7 LB |
3950 | ret = tcp_set_congestion_control(sk, name, false, |
3951 | reinit); | |
91b5b21c | 3952 | } else { |
fc747810 LB |
3953 | struct tcp_sock *tp = tcp_sk(sk); |
3954 | ||
3955 | if (optlen != sizeof(int)) | |
3956 | return -EINVAL; | |
3957 | ||
3958 | val = *((int *)optval); | |
3959 | /* Only some options are supported */ | |
3960 | switch (optname) { | |
3961 | case TCP_BPF_IW: | |
3962 | if (val <= 0 || tp->data_segs_out > 0) | |
3963 | ret = -EINVAL; | |
3964 | else | |
3965 | tp->snd_cwnd = val; | |
3966 | break; | |
13bf9641 LB |
3967 | case TCP_BPF_SNDCWND_CLAMP: |
3968 | if (val <= 0) { | |
3969 | ret = -EINVAL; | |
3970 | } else { | |
3971 | tp->snd_cwnd_clamp = val; | |
3972 | tp->snd_ssthresh = val; | |
3973 | } | |
6d3f06a0 | 3974 | break; |
fc747810 LB |
3975 | default: |
3976 | ret = -EINVAL; | |
3977 | } | |
91b5b21c | 3978 | } |
91b5b21c | 3979 | #endif |
8c4b4c7e LB |
3980 | } else { |
3981 | ret = -EINVAL; | |
3982 | } | |
3983 | return ret; | |
3984 | } | |
3985 | ||
3986 | static const struct bpf_func_proto bpf_setsockopt_proto = { | |
3987 | .func = bpf_setsockopt, | |
cd86d1fd | 3988 | .gpl_only = false, |
8c4b4c7e LB |
3989 | .ret_type = RET_INTEGER, |
3990 | .arg1_type = ARG_PTR_TO_CTX, | |
3991 | .arg2_type = ARG_ANYTHING, | |
3992 | .arg3_type = ARG_ANYTHING, | |
3993 | .arg4_type = ARG_PTR_TO_MEM, | |
3994 | .arg5_type = ARG_CONST_SIZE, | |
3995 | }; | |
3996 | ||
cd86d1fd LB |
3997 | BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
3998 | int, level, int, optname, char *, optval, int, optlen) | |
3999 | { | |
4000 | struct sock *sk = bpf_sock->sk; | |
cd86d1fd LB |
4001 | |
4002 | if (!sk_fullsock(sk)) | |
4003 | goto err_clear; | |
4004 | ||
4005 | #ifdef CONFIG_INET | |
4006 | if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { | |
4007 | if (optname == TCP_CONGESTION) { | |
4008 | struct inet_connection_sock *icsk = inet_csk(sk); | |
4009 | ||
4010 | if (!icsk->icsk_ca_ops || optlen <= 1) | |
4011 | goto err_clear; | |
4012 | strncpy(optval, icsk->icsk_ca_ops->name, optlen); | |
4013 | optval[optlen - 1] = 0; | |
4014 | } else { | |
4015 | goto err_clear; | |
4016 | } | |
6f5c39fa NS |
4017 | } else if (level == SOL_IP) { |
4018 | struct inet_sock *inet = inet_sk(sk); | |
4019 | ||
4020 | if (optlen != sizeof(int) || sk->sk_family != AF_INET) | |
4021 | goto err_clear; | |
4022 | ||
4023 | /* Only some options are supported */ | |
4024 | switch (optname) { | |
4025 | case IP_TOS: | |
4026 | *((int *)optval) = (int)inet->tos; | |
4027 | break; | |
4028 | default: | |
4029 | goto err_clear; | |
4030 | } | |
6f9bd3d7 LB |
4031 | #if IS_ENABLED(CONFIG_IPV6) |
4032 | } else if (level == SOL_IPV6) { | |
4033 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4034 | ||
4035 | if (optlen != sizeof(int) || sk->sk_family != AF_INET6) | |
4036 | goto err_clear; | |
4037 | ||
4038 | /* Only some options are supported */ | |
4039 | switch (optname) { | |
4040 | case IPV6_TCLASS: | |
4041 | *((int *)optval) = (int)np->tclass; | |
4042 | break; | |
4043 | default: | |
4044 | goto err_clear; | |
4045 | } | |
4046 | #endif | |
cd86d1fd LB |
4047 | } else { |
4048 | goto err_clear; | |
4049 | } | |
aa2bc739 | 4050 | return 0; |
cd86d1fd LB |
4051 | #endif |
4052 | err_clear: | |
4053 | memset(optval, 0, optlen); | |
4054 | return -EINVAL; | |
4055 | } | |
4056 | ||
4057 | static const struct bpf_func_proto bpf_getsockopt_proto = { | |
4058 | .func = bpf_getsockopt, | |
4059 | .gpl_only = false, | |
4060 | .ret_type = RET_INTEGER, | |
4061 | .arg1_type = ARG_PTR_TO_CTX, | |
4062 | .arg2_type = ARG_ANYTHING, | |
4063 | .arg3_type = ARG_ANYTHING, | |
4064 | .arg4_type = ARG_PTR_TO_UNINIT_MEM, | |
4065 | .arg5_type = ARG_CONST_SIZE, | |
4066 | }; | |
4067 | ||
b13d8807 LB |
4068 | BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, |
4069 | int, argval) | |
4070 | { | |
4071 | struct sock *sk = bpf_sock->sk; | |
4072 | int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; | |
4073 | ||
a7dcdf6e | 4074 | if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) |
b13d8807 LB |
4075 | return -EINVAL; |
4076 | ||
b13d8807 LB |
4077 | if (val) |
4078 | tcp_sk(sk)->bpf_sock_ops_cb_flags = val; | |
4079 | ||
4080 | return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); | |
b13d8807 LB |
4081 | } |
4082 | ||
4083 | static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { | |
4084 | .func = bpf_sock_ops_cb_flags_set, | |
4085 | .gpl_only = false, | |
4086 | .ret_type = RET_INTEGER, | |
4087 | .arg1_type = ARG_PTR_TO_CTX, | |
4088 | .arg2_type = ARG_ANYTHING, | |
4089 | }; | |
4090 | ||
d74bad4e AI |
4091 | const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; |
4092 | EXPORT_SYMBOL_GPL(ipv6_bpf_stub); | |
4093 | ||
4094 | BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, | |
4095 | int, addr_len) | |
4096 | { | |
4097 | #ifdef CONFIG_INET | |
4098 | struct sock *sk = ctx->sk; | |
4099 | int err; | |
4100 | ||
4101 | /* Binding to port can be expensive so it's prohibited in the helper. | |
4102 | * Only binding to IP is supported. | |
4103 | */ | |
4104 | err = -EINVAL; | |
4105 | if (addr->sa_family == AF_INET) { | |
4106 | if (addr_len < sizeof(struct sockaddr_in)) | |
4107 | return err; | |
4108 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
4109 | return err; | |
4110 | return __inet_bind(sk, addr, addr_len, true, false); | |
4111 | #if IS_ENABLED(CONFIG_IPV6) | |
4112 | } else if (addr->sa_family == AF_INET6) { | |
4113 | if (addr_len < SIN6_LEN_RFC2133) | |
4114 | return err; | |
4115 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
4116 | return err; | |
4117 | /* ipv6_bpf_stub cannot be NULL, since it's called from | |
4118 | * bpf_cgroup_inet6_connect hook and ipv6 is already loaded | |
4119 | */ | |
4120 | return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); | |
4121 | #endif /* CONFIG_IPV6 */ | |
4122 | } | |
4123 | #endif /* CONFIG_INET */ | |
4124 | ||
4125 | return -EAFNOSUPPORT; | |
4126 | } | |
4127 | ||
4128 | static const struct bpf_func_proto bpf_bind_proto = { | |
4129 | .func = bpf_bind, | |
4130 | .gpl_only = false, | |
4131 | .ret_type = RET_INTEGER, | |
4132 | .arg1_type = ARG_PTR_TO_CTX, | |
4133 | .arg2_type = ARG_PTR_TO_MEM, | |
4134 | .arg3_type = ARG_CONST_SIZE, | |
4135 | }; | |
4136 | ||
12bed760 EB |
4137 | #ifdef CONFIG_XFRM |
4138 | BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, | |
4139 | struct bpf_xfrm_state *, to, u32, size, u64, flags) | |
4140 | { | |
4141 | const struct sec_path *sp = skb_sec_path(skb); | |
4142 | const struct xfrm_state *x; | |
4143 | ||
4144 | if (!sp || unlikely(index >= sp->len || flags)) | |
4145 | goto err_clear; | |
4146 | ||
4147 | x = sp->xvec[index]; | |
4148 | ||
4149 | if (unlikely(size != sizeof(struct bpf_xfrm_state))) | |
4150 | goto err_clear; | |
4151 | ||
4152 | to->reqid = x->props.reqid; | |
4153 | to->spi = x->id.spi; | |
4154 | to->family = x->props.family; | |
1fbc2e0c DB |
4155 | to->ext = 0; |
4156 | ||
12bed760 EB |
4157 | if (to->family == AF_INET6) { |
4158 | memcpy(to->remote_ipv6, x->props.saddr.a6, | |
4159 | sizeof(to->remote_ipv6)); | |
4160 | } else { | |
4161 | to->remote_ipv4 = x->props.saddr.a4; | |
1fbc2e0c | 4162 | memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
12bed760 EB |
4163 | } |
4164 | ||
4165 | return 0; | |
4166 | err_clear: | |
4167 | memset(to, 0, size); | |
4168 | return -EINVAL; | |
4169 | } | |
4170 | ||
4171 | static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { | |
4172 | .func = bpf_skb_get_xfrm_state, | |
4173 | .gpl_only = false, | |
4174 | .ret_type = RET_INTEGER, | |
4175 | .arg1_type = ARG_PTR_TO_CTX, | |
4176 | .arg2_type = ARG_ANYTHING, | |
4177 | .arg3_type = ARG_PTR_TO_UNINIT_MEM, | |
4178 | .arg4_type = ARG_CONST_SIZE, | |
4179 | .arg5_type = ARG_ANYTHING, | |
4180 | }; | |
4181 | #endif | |
4182 | ||
87f5fc7e DA |
4183 | #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) |
4184 | static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, | |
4185 | const struct neighbour *neigh, | |
4186 | const struct net_device *dev) | |
4187 | { | |
4188 | memcpy(params->dmac, neigh->ha, ETH_ALEN); | |
4189 | memcpy(params->smac, dev->dev_addr, ETH_ALEN); | |
4190 | params->h_vlan_TCI = 0; | |
4191 | params->h_vlan_proto = 0; | |
4c79579b | 4192 | params->ifindex = dev->ifindex; |
87f5fc7e | 4193 | |
4c79579b | 4194 | return 0; |
87f5fc7e DA |
4195 | } |
4196 | #endif | |
4197 | ||
4198 | #if IS_ENABLED(CONFIG_INET) | |
4199 | static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4200 | u32 flags, bool check_mtu) |
87f5fc7e DA |
4201 | { |
4202 | struct in_device *in_dev; | |
4203 | struct neighbour *neigh; | |
4204 | struct net_device *dev; | |
4205 | struct fib_result res; | |
4206 | struct fib_nh *nh; | |
4207 | struct flowi4 fl4; | |
4208 | int err; | |
4f74fede | 4209 | u32 mtu; |
87f5fc7e DA |
4210 | |
4211 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4212 | if (unlikely(!dev)) | |
4213 | return -ENODEV; | |
4214 | ||
4215 | /* verify forwarding is enabled on this interface */ | |
4216 | in_dev = __in_dev_get_rcu(dev); | |
4217 | if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) | |
4c79579b | 4218 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4219 | |
4220 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4221 | fl4.flowi4_iif = 1; | |
4222 | fl4.flowi4_oif = params->ifindex; | |
4223 | } else { | |
4224 | fl4.flowi4_iif = params->ifindex; | |
4225 | fl4.flowi4_oif = 0; | |
4226 | } | |
4227 | fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; | |
4228 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
4229 | fl4.flowi4_flags = 0; | |
4230 | ||
4231 | fl4.flowi4_proto = params->l4_protocol; | |
4232 | fl4.daddr = params->ipv4_dst; | |
4233 | fl4.saddr = params->ipv4_src; | |
4234 | fl4.fl4_sport = params->sport; | |
4235 | fl4.fl4_dport = params->dport; | |
4236 | ||
4237 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4238 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4239 | struct fib_table *tb; | |
4240 | ||
4241 | tb = fib_get_table(net, tbid); | |
4242 | if (unlikely(!tb)) | |
4c79579b | 4243 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4244 | |
4245 | err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); | |
4246 | } else { | |
4247 | fl4.flowi4_mark = 0; | |
4248 | fl4.flowi4_secid = 0; | |
4249 | fl4.flowi4_tun_key.tun_id = 0; | |
4250 | fl4.flowi4_uid = sock_net_uid(net, NULL); | |
4251 | ||
4252 | err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); | |
4253 | } | |
4254 | ||
4c79579b DA |
4255 | if (err) { |
4256 | /* map fib lookup errors to RTN_ type */ | |
4257 | if (err == -EINVAL) | |
4258 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4259 | if (err == -EHOSTUNREACH) | |
4260 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4261 | if (err == -EACCES) | |
4262 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4263 | ||
4264 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
4265 | } | |
4266 | ||
4267 | if (res.type != RTN_UNICAST) | |
4268 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
87f5fc7e DA |
4269 | |
4270 | if (res.fi->fib_nhs > 1) | |
4271 | fib_select_path(net, &res, &fl4, NULL); | |
4272 | ||
4f74fede DA |
4273 | if (check_mtu) { |
4274 | mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); | |
4275 | if (params->tot_len > mtu) | |
4c79579b | 4276 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4277 | } |
4278 | ||
87f5fc7e DA |
4279 | nh = &res.fi->fib_nh[res.nh_sel]; |
4280 | ||
4281 | /* do not handle lwt encaps right now */ | |
4282 | if (nh->nh_lwtstate) | |
4c79579b | 4283 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e DA |
4284 | |
4285 | dev = nh->nh_dev; | |
87f5fc7e DA |
4286 | if (nh->nh_gw) |
4287 | params->ipv4_dst = nh->nh_gw; | |
4288 | ||
4289 | params->rt_metric = res.fi->fib_priority; | |
4290 | ||
4291 | /* xdp and cls_bpf programs are run in RCU-bh so | |
4292 | * rcu_read_lock_bh is not needed here | |
4293 | */ | |
4294 | neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)params->ipv4_dst); | |
4c79579b DA |
4295 | if (!neigh) |
4296 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4297 | |
4c79579b | 4298 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4299 | } |
4300 | #endif | |
4301 | ||
4302 | #if IS_ENABLED(CONFIG_IPV6) | |
4303 | static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, | |
4f74fede | 4304 | u32 flags, bool check_mtu) |
87f5fc7e DA |
4305 | { |
4306 | struct in6_addr *src = (struct in6_addr *) params->ipv6_src; | |
4307 | struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; | |
4308 | struct neighbour *neigh; | |
4309 | struct net_device *dev; | |
4310 | struct inet6_dev *idev; | |
4311 | struct fib6_info *f6i; | |
4312 | struct flowi6 fl6; | |
4313 | int strict = 0; | |
4314 | int oif; | |
4f74fede | 4315 | u32 mtu; |
87f5fc7e DA |
4316 | |
4317 | /* link local addresses are never forwarded */ | |
4318 | if (rt6_need_strict(dst) || rt6_need_strict(src)) | |
4c79579b | 4319 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4320 | |
4321 | dev = dev_get_by_index_rcu(net, params->ifindex); | |
4322 | if (unlikely(!dev)) | |
4323 | return -ENODEV; | |
4324 | ||
4325 | idev = __in6_dev_get_safely(dev); | |
4326 | if (unlikely(!idev || !net->ipv6.devconf_all->forwarding)) | |
4c79579b | 4327 | return BPF_FIB_LKUP_RET_FWD_DISABLED; |
87f5fc7e DA |
4328 | |
4329 | if (flags & BPF_FIB_LOOKUP_OUTPUT) { | |
4330 | fl6.flowi6_iif = 1; | |
4331 | oif = fl6.flowi6_oif = params->ifindex; | |
4332 | } else { | |
4333 | oif = fl6.flowi6_iif = params->ifindex; | |
4334 | fl6.flowi6_oif = 0; | |
4335 | strict = RT6_LOOKUP_F_HAS_SADDR; | |
4336 | } | |
bd3a08aa | 4337 | fl6.flowlabel = params->flowinfo; |
87f5fc7e DA |
4338 | fl6.flowi6_scope = 0; |
4339 | fl6.flowi6_flags = 0; | |
4340 | fl6.mp_hash = 0; | |
4341 | ||
4342 | fl6.flowi6_proto = params->l4_protocol; | |
4343 | fl6.daddr = *dst; | |
4344 | fl6.saddr = *src; | |
4345 | fl6.fl6_sport = params->sport; | |
4346 | fl6.fl6_dport = params->dport; | |
4347 | ||
4348 | if (flags & BPF_FIB_LOOKUP_DIRECT) { | |
4349 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; | |
4350 | struct fib6_table *tb; | |
4351 | ||
4352 | tb = ipv6_stub->fib6_get_table(net, tbid); | |
4353 | if (unlikely(!tb)) | |
4c79579b | 4354 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
87f5fc7e DA |
4355 | |
4356 | f6i = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, strict); | |
4357 | } else { | |
4358 | fl6.flowi6_mark = 0; | |
4359 | fl6.flowi6_secid = 0; | |
4360 | fl6.flowi6_tun_key.tun_id = 0; | |
4361 | fl6.flowi6_uid = sock_net_uid(net, NULL); | |
4362 | ||
4363 | f6i = ipv6_stub->fib6_lookup(net, oif, &fl6, strict); | |
4364 | } | |
4365 | ||
4366 | if (unlikely(IS_ERR_OR_NULL(f6i) || f6i == net->ipv6.fib6_null_entry)) | |
4c79579b DA |
4367 | return BPF_FIB_LKUP_RET_NOT_FWDED; |
4368 | ||
4369 | if (unlikely(f6i->fib6_flags & RTF_REJECT)) { | |
4370 | switch (f6i->fib6_type) { | |
4371 | case RTN_BLACKHOLE: | |
4372 | return BPF_FIB_LKUP_RET_BLACKHOLE; | |
4373 | case RTN_UNREACHABLE: | |
4374 | return BPF_FIB_LKUP_RET_UNREACHABLE; | |
4375 | case RTN_PROHIBIT: | |
4376 | return BPF_FIB_LKUP_RET_PROHIBIT; | |
4377 | default: | |
4378 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
4379 | } | |
4380 | } | |
87f5fc7e | 4381 | |
4c79579b DA |
4382 | if (f6i->fib6_type != RTN_UNICAST) |
4383 | return BPF_FIB_LKUP_RET_NOT_FWDED; | |
87f5fc7e DA |
4384 | |
4385 | if (f6i->fib6_nsiblings && fl6.flowi6_oif == 0) | |
4386 | f6i = ipv6_stub->fib6_multipath_select(net, f6i, &fl6, | |
4387 | fl6.flowi6_oif, NULL, | |
4388 | strict); | |
4389 | ||
4f74fede DA |
4390 | if (check_mtu) { |
4391 | mtu = ipv6_stub->ip6_mtu_from_fib6(f6i, dst, src); | |
4392 | if (params->tot_len > mtu) | |
4c79579b | 4393 | return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4394 | } |
4395 | ||
87f5fc7e | 4396 | if (f6i->fib6_nh.nh_lwtstate) |
4c79579b | 4397 | return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
87f5fc7e DA |
4398 | |
4399 | if (f6i->fib6_flags & RTF_GATEWAY) | |
4400 | *dst = f6i->fib6_nh.nh_gw; | |
4401 | ||
4402 | dev = f6i->fib6_nh.nh_dev; | |
4403 | params->rt_metric = f6i->fib6_metric; | |
4404 | ||
4405 | /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is | |
4406 | * not needed here. Can not use __ipv6_neigh_lookup_noref here | |
4407 | * because we need to get nd_tbl via the stub | |
4408 | */ | |
4409 | neigh = ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128, | |
4410 | ndisc_hashfn, dst, dev); | |
4c79579b DA |
4411 | if (!neigh) |
4412 | return BPF_FIB_LKUP_RET_NO_NEIGH; | |
87f5fc7e | 4413 | |
4c79579b | 4414 | return bpf_fib_set_fwd_params(params, neigh, dev); |
87f5fc7e DA |
4415 | } |
4416 | #endif | |
4417 | ||
4418 | BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, | |
4419 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4420 | { | |
4421 | if (plen < sizeof(*params)) | |
4422 | return -EINVAL; | |
4423 | ||
9ce64f19 DA |
4424 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4425 | return -EINVAL; | |
4426 | ||
87f5fc7e DA |
4427 | switch (params->family) { |
4428 | #if IS_ENABLED(CONFIG_INET) | |
4429 | case AF_INET: | |
4430 | return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4431 | flags, true); |
87f5fc7e DA |
4432 | #endif |
4433 | #if IS_ENABLED(CONFIG_IPV6) | |
4434 | case AF_INET6: | |
4435 | return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, | |
4f74fede | 4436 | flags, true); |
87f5fc7e DA |
4437 | #endif |
4438 | } | |
bcece5dc | 4439 | return -EAFNOSUPPORT; |
87f5fc7e DA |
4440 | } |
4441 | ||
4442 | static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { | |
4443 | .func = bpf_xdp_fib_lookup, | |
4444 | .gpl_only = true, | |
4445 | .ret_type = RET_INTEGER, | |
4446 | .arg1_type = ARG_PTR_TO_CTX, | |
4447 | .arg2_type = ARG_PTR_TO_MEM, | |
4448 | .arg3_type = ARG_CONST_SIZE, | |
4449 | .arg4_type = ARG_ANYTHING, | |
4450 | }; | |
4451 | ||
4452 | BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, | |
4453 | struct bpf_fib_lookup *, params, int, plen, u32, flags) | |
4454 | { | |
4f74fede | 4455 | struct net *net = dev_net(skb->dev); |
4c79579b | 4456 | int rc = -EAFNOSUPPORT; |
4f74fede | 4457 | |
87f5fc7e DA |
4458 | if (plen < sizeof(*params)) |
4459 | return -EINVAL; | |
4460 | ||
9ce64f19 DA |
4461 | if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
4462 | return -EINVAL; | |
4463 | ||
87f5fc7e DA |
4464 | switch (params->family) { |
4465 | #if IS_ENABLED(CONFIG_INET) | |
4466 | case AF_INET: | |
4c79579b | 4467 | rc = bpf_ipv4_fib_lookup(net, params, flags, false); |
4f74fede | 4468 | break; |
87f5fc7e DA |
4469 | #endif |
4470 | #if IS_ENABLED(CONFIG_IPV6) | |
4471 | case AF_INET6: | |
4c79579b | 4472 | rc = bpf_ipv6_fib_lookup(net, params, flags, false); |
4f74fede | 4473 | break; |
87f5fc7e DA |
4474 | #endif |
4475 | } | |
4f74fede | 4476 | |
4c79579b | 4477 | if (!rc) { |
4f74fede DA |
4478 | struct net_device *dev; |
4479 | ||
4c79579b | 4480 | dev = dev_get_by_index_rcu(net, params->ifindex); |
4f74fede | 4481 | if (!is_skb_forwardable(dev, skb)) |
4c79579b | 4482 | rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; |
4f74fede DA |
4483 | } |
4484 | ||
4c79579b | 4485 | return rc; |
87f5fc7e DA |
4486 | } |
4487 | ||
4488 | static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { | |
4489 | .func = bpf_skb_fib_lookup, | |
4490 | .gpl_only = true, | |
4491 | .ret_type = RET_INTEGER, | |
4492 | .arg1_type = ARG_PTR_TO_CTX, | |
4493 | .arg2_type = ARG_PTR_TO_MEM, | |
4494 | .arg3_type = ARG_CONST_SIZE, | |
4495 | .arg4_type = ARG_ANYTHING, | |
4496 | }; | |
4497 | ||
fe94cc29 MX |
4498 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
4499 | static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) | |
4500 | { | |
4501 | int err; | |
4502 | struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; | |
4503 | ||
4504 | if (!seg6_validate_srh(srh, len)) | |
4505 | return -EINVAL; | |
4506 | ||
4507 | switch (type) { | |
4508 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4509 | if (skb->protocol != htons(ETH_P_IPV6)) | |
4510 | return -EBADMSG; | |
4511 | ||
4512 | err = seg6_do_srh_inline(skb, srh); | |
4513 | break; | |
4514 | case BPF_LWT_ENCAP_SEG6: | |
4515 | skb_reset_inner_headers(skb); | |
4516 | skb->encapsulation = 1; | |
4517 | err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); | |
4518 | break; | |
4519 | default: | |
4520 | return -EINVAL; | |
4521 | } | |
4522 | ||
4523 | bpf_compute_data_pointers(skb); | |
4524 | if (err) | |
4525 | return err; | |
4526 | ||
4527 | ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
4528 | skb_set_transport_header(skb, sizeof(struct ipv6hdr)); | |
4529 | ||
4530 | return seg6_lookup_nexthop(skb, NULL, 0); | |
4531 | } | |
4532 | #endif /* CONFIG_IPV6_SEG6_BPF */ | |
4533 | ||
4534 | BPF_CALL_4(bpf_lwt_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, | |
4535 | u32, len) | |
4536 | { | |
4537 | switch (type) { | |
4538 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) | |
4539 | case BPF_LWT_ENCAP_SEG6: | |
4540 | case BPF_LWT_ENCAP_SEG6_INLINE: | |
4541 | return bpf_push_seg6_encap(skb, type, hdr, len); | |
4542 | #endif | |
4543 | default: | |
4544 | return -EINVAL; | |
4545 | } | |
4546 | } | |
4547 | ||
4548 | static const struct bpf_func_proto bpf_lwt_push_encap_proto = { | |
4549 | .func = bpf_lwt_push_encap, | |
4550 | .gpl_only = false, | |
4551 | .ret_type = RET_INTEGER, | |
4552 | .arg1_type = ARG_PTR_TO_CTX, | |
4553 | .arg2_type = ARG_ANYTHING, | |
4554 | .arg3_type = ARG_PTR_TO_MEM, | |
4555 | .arg4_type = ARG_CONST_SIZE | |
4556 | }; | |
4557 | ||
61d76980 | 4558 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
4559 | BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, |
4560 | const void *, from, u32, len) | |
4561 | { | |
fe94cc29 MX |
4562 | struct seg6_bpf_srh_state *srh_state = |
4563 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 4564 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 4565 | void *srh_tlvs, *srh_end, *ptr; |
fe94cc29 MX |
4566 | int srhoff = 0; |
4567 | ||
486cdf21 | 4568 | if (srh == NULL) |
fe94cc29 MX |
4569 | return -EINVAL; |
4570 | ||
fe94cc29 MX |
4571 | srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); |
4572 | srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); | |
4573 | ||
4574 | ptr = skb->data + offset; | |
4575 | if (ptr >= srh_tlvs && ptr + len <= srh_end) | |
486cdf21 | 4576 | srh_state->valid = false; |
fe94cc29 MX |
4577 | else if (ptr < (void *)&srh->flags || |
4578 | ptr + len > (void *)&srh->segments) | |
4579 | return -EFAULT; | |
4580 | ||
4581 | if (unlikely(bpf_try_make_writable(skb, offset + len))) | |
4582 | return -EFAULT; | |
486cdf21 MX |
4583 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
4584 | return -EINVAL; | |
4585 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 MX |
4586 | |
4587 | memcpy(skb->data + offset, from, len); | |
4588 | return 0; | |
fe94cc29 MX |
4589 | } |
4590 | ||
4591 | static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { | |
4592 | .func = bpf_lwt_seg6_store_bytes, | |
4593 | .gpl_only = false, | |
4594 | .ret_type = RET_INTEGER, | |
4595 | .arg1_type = ARG_PTR_TO_CTX, | |
4596 | .arg2_type = ARG_ANYTHING, | |
4597 | .arg3_type = ARG_PTR_TO_MEM, | |
4598 | .arg4_type = ARG_CONST_SIZE | |
4599 | }; | |
4600 | ||
486cdf21 | 4601 | static void bpf_update_srh_state(struct sk_buff *skb) |
fe94cc29 | 4602 | { |
fe94cc29 MX |
4603 | struct seg6_bpf_srh_state *srh_state = |
4604 | this_cpu_ptr(&seg6_bpf_srh_states); | |
fe94cc29 | 4605 | int srhoff = 0; |
fe94cc29 | 4606 | |
486cdf21 MX |
4607 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { |
4608 | srh_state->srh = NULL; | |
4609 | } else { | |
4610 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
4611 | srh_state->hdrlen = srh_state->srh->hdrlen << 3; | |
4612 | srh_state->valid = true; | |
fe94cc29 | 4613 | } |
486cdf21 MX |
4614 | } |
4615 | ||
4616 | BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, | |
4617 | u32, action, void *, param, u32, param_len) | |
4618 | { | |
4619 | struct seg6_bpf_srh_state *srh_state = | |
4620 | this_cpu_ptr(&seg6_bpf_srh_states); | |
4621 | int hdroff = 0; | |
4622 | int err; | |
fe94cc29 MX |
4623 | |
4624 | switch (action) { | |
4625 | case SEG6_LOCAL_ACTION_END_X: | |
486cdf21 MX |
4626 | if (!seg6_bpf_has_valid_srh(skb)) |
4627 | return -EBADMSG; | |
fe94cc29 MX |
4628 | if (param_len != sizeof(struct in6_addr)) |
4629 | return -EINVAL; | |
4630 | return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); | |
4631 | case SEG6_LOCAL_ACTION_END_T: | |
486cdf21 MX |
4632 | if (!seg6_bpf_has_valid_srh(skb)) |
4633 | return -EBADMSG; | |
fe94cc29 MX |
4634 | if (param_len != sizeof(int)) |
4635 | return -EINVAL; | |
4636 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); | |
486cdf21 MX |
4637 | case SEG6_LOCAL_ACTION_END_DT6: |
4638 | if (!seg6_bpf_has_valid_srh(skb)) | |
4639 | return -EBADMSG; | |
fe94cc29 MX |
4640 | if (param_len != sizeof(int)) |
4641 | return -EINVAL; | |
486cdf21 MX |
4642 | |
4643 | if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) | |
4644 | return -EBADMSG; | |
4645 | if (!pskb_pull(skb, hdroff)) | |
4646 | return -EBADMSG; | |
4647 | ||
4648 | skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); | |
4649 | skb_reset_network_header(skb); | |
4650 | skb_reset_transport_header(skb); | |
4651 | skb->encapsulation = 0; | |
4652 | ||
4653 | bpf_compute_data_pointers(skb); | |
4654 | bpf_update_srh_state(skb); | |
fe94cc29 MX |
4655 | return seg6_lookup_nexthop(skb, NULL, *(int *)param); |
4656 | case SEG6_LOCAL_ACTION_END_B6: | |
486cdf21 MX |
4657 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
4658 | return -EBADMSG; | |
fe94cc29 MX |
4659 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, |
4660 | param, param_len); | |
4661 | if (!err) | |
486cdf21 MX |
4662 | bpf_update_srh_state(skb); |
4663 | ||
fe94cc29 MX |
4664 | return err; |
4665 | case SEG6_LOCAL_ACTION_END_B6_ENCAP: | |
486cdf21 MX |
4666 | if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
4667 | return -EBADMSG; | |
fe94cc29 MX |
4668 | err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, |
4669 | param, param_len); | |
4670 | if (!err) | |
486cdf21 MX |
4671 | bpf_update_srh_state(skb); |
4672 | ||
fe94cc29 MX |
4673 | return err; |
4674 | default: | |
4675 | return -EINVAL; | |
4676 | } | |
fe94cc29 MX |
4677 | } |
4678 | ||
4679 | static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { | |
4680 | .func = bpf_lwt_seg6_action, | |
4681 | .gpl_only = false, | |
4682 | .ret_type = RET_INTEGER, | |
4683 | .arg1_type = ARG_PTR_TO_CTX, | |
4684 | .arg2_type = ARG_ANYTHING, | |
4685 | .arg3_type = ARG_PTR_TO_MEM, | |
4686 | .arg4_type = ARG_CONST_SIZE | |
4687 | }; | |
4688 | ||
4689 | BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, | |
4690 | s32, len) | |
4691 | { | |
fe94cc29 MX |
4692 | struct seg6_bpf_srh_state *srh_state = |
4693 | this_cpu_ptr(&seg6_bpf_srh_states); | |
486cdf21 | 4694 | struct ipv6_sr_hdr *srh = srh_state->srh; |
fe94cc29 | 4695 | void *srh_end, *srh_tlvs, *ptr; |
fe94cc29 MX |
4696 | struct ipv6hdr *hdr; |
4697 | int srhoff = 0; | |
4698 | int ret; | |
4699 | ||
486cdf21 | 4700 | if (unlikely(srh == NULL)) |
fe94cc29 | 4701 | return -EINVAL; |
fe94cc29 MX |
4702 | |
4703 | srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + | |
4704 | ((srh->first_segment + 1) << 4)); | |
4705 | srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + | |
4706 | srh_state->hdrlen); | |
4707 | ptr = skb->data + offset; | |
4708 | ||
4709 | if (unlikely(ptr < srh_tlvs || ptr > srh_end)) | |
4710 | return -EFAULT; | |
4711 | if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) | |
4712 | return -EFAULT; | |
4713 | ||
4714 | if (len > 0) { | |
4715 | ret = skb_cow_head(skb, len); | |
4716 | if (unlikely(ret < 0)) | |
4717 | return ret; | |
4718 | ||
4719 | ret = bpf_skb_net_hdr_push(skb, offset, len); | |
4720 | } else { | |
4721 | ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); | |
4722 | } | |
4723 | ||
4724 | bpf_compute_data_pointers(skb); | |
4725 | if (unlikely(ret < 0)) | |
4726 | return ret; | |
4727 | ||
4728 | hdr = (struct ipv6hdr *)skb->data; | |
4729 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
4730 | ||
486cdf21 MX |
4731 | if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
4732 | return -EINVAL; | |
4733 | srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); | |
fe94cc29 | 4734 | srh_state->hdrlen += len; |
486cdf21 | 4735 | srh_state->valid = false; |
fe94cc29 | 4736 | return 0; |
fe94cc29 MX |
4737 | } |
4738 | ||
4739 | static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { | |
4740 | .func = bpf_lwt_seg6_adjust_srh, | |
4741 | .gpl_only = false, | |
4742 | .ret_type = RET_INTEGER, | |
4743 | .arg1_type = ARG_PTR_TO_CTX, | |
4744 | .arg2_type = ARG_ANYTHING, | |
4745 | .arg3_type = ARG_ANYTHING, | |
4746 | }; | |
61d76980 | 4747 | #endif /* CONFIG_IPV6_SEG6_BPF */ |
fe94cc29 MX |
4748 | |
4749 | bool bpf_helper_changes_pkt_data(void *func) | |
4750 | { | |
4751 | if (func == bpf_skb_vlan_push || | |
4752 | func == bpf_skb_vlan_pop || | |
4753 | func == bpf_skb_store_bytes || | |
4754 | func == bpf_skb_change_proto || | |
4755 | func == bpf_skb_change_head || | |
0ea488ff | 4756 | func == sk_skb_change_head || |
fe94cc29 | 4757 | func == bpf_skb_change_tail || |
0ea488ff | 4758 | func == sk_skb_change_tail || |
fe94cc29 MX |
4759 | func == bpf_skb_adjust_room || |
4760 | func == bpf_skb_pull_data || | |
0ea488ff | 4761 | func == sk_skb_pull_data || |
fe94cc29 MX |
4762 | func == bpf_clone_redirect || |
4763 | func == bpf_l3_csum_replace || | |
4764 | func == bpf_l4_csum_replace || | |
4765 | func == bpf_xdp_adjust_head || | |
4766 | func == bpf_xdp_adjust_meta || | |
4767 | func == bpf_msg_pull_data || | |
4768 | func == bpf_xdp_adjust_tail || | |
61d76980 | 4769 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
fe94cc29 MX |
4770 | func == bpf_lwt_seg6_store_bytes || |
4771 | func == bpf_lwt_seg6_adjust_srh || | |
61d76980 MX |
4772 | func == bpf_lwt_seg6_action || |
4773 | #endif | |
4774 | func == bpf_lwt_push_encap) | |
fe94cc29 MX |
4775 | return true; |
4776 | ||
4777 | return false; | |
4778 | } | |
4779 | ||
d4052c4a | 4780 | static const struct bpf_func_proto * |
2492d3b8 | 4781 | bpf_base_func_proto(enum bpf_func_id func_id) |
89aa0758 AS |
4782 | { |
4783 | switch (func_id) { | |
4784 | case BPF_FUNC_map_lookup_elem: | |
4785 | return &bpf_map_lookup_elem_proto; | |
4786 | case BPF_FUNC_map_update_elem: | |
4787 | return &bpf_map_update_elem_proto; | |
4788 | case BPF_FUNC_map_delete_elem: | |
4789 | return &bpf_map_delete_elem_proto; | |
03e69b50 DB |
4790 | case BPF_FUNC_get_prandom_u32: |
4791 | return &bpf_get_prandom_u32_proto; | |
c04167ce | 4792 | case BPF_FUNC_get_smp_processor_id: |
80b48c44 | 4793 | return &bpf_get_raw_smp_processor_id_proto; |
2d0e30c3 DB |
4794 | case BPF_FUNC_get_numa_node_id: |
4795 | return &bpf_get_numa_node_id_proto; | |
04fd61ab AS |
4796 | case BPF_FUNC_tail_call: |
4797 | return &bpf_tail_call_proto; | |
17ca8cbf DB |
4798 | case BPF_FUNC_ktime_get_ns: |
4799 | return &bpf_ktime_get_ns_proto; | |
0756ea3e | 4800 | case BPF_FUNC_trace_printk: |
1be7f75d AS |
4801 | if (capable(CAP_SYS_ADMIN)) |
4802 | return bpf_get_trace_printk_proto(); | |
2cc0608e | 4803 | /* else: fall through */ |
89aa0758 AS |
4804 | default: |
4805 | return NULL; | |
4806 | } | |
4807 | } | |
4808 | ||
ae2cf1c4 | 4809 | static const struct bpf_func_proto * |
5e43f899 | 4810 | sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
ae2cf1c4 DA |
4811 | { |
4812 | switch (func_id) { | |
4813 | /* inet and inet6 sockets are created in a process | |
4814 | * context so there is always a valid uid/gid | |
4815 | */ | |
4816 | case BPF_FUNC_get_current_uid_gid: | |
4817 | return &bpf_get_current_uid_gid_proto; | |
cd339431 RG |
4818 | case BPF_FUNC_get_local_storage: |
4819 | return &bpf_get_local_storage_proto; | |
ae2cf1c4 DA |
4820 | default: |
4821 | return bpf_base_func_proto(func_id); | |
4822 | } | |
4823 | } | |
4824 | ||
4fbac77d AI |
4825 | static const struct bpf_func_proto * |
4826 | sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
4827 | { | |
4828 | switch (func_id) { | |
4829 | /* inet and inet6 sockets are created in a process | |
4830 | * context so there is always a valid uid/gid | |
4831 | */ | |
4832 | case BPF_FUNC_get_current_uid_gid: | |
4833 | return &bpf_get_current_uid_gid_proto; | |
d74bad4e AI |
4834 | case BPF_FUNC_bind: |
4835 | switch (prog->expected_attach_type) { | |
4836 | case BPF_CGROUP_INET4_CONNECT: | |
4837 | case BPF_CGROUP_INET6_CONNECT: | |
4838 | return &bpf_bind_proto; | |
4839 | default: | |
4840 | return NULL; | |
4841 | } | |
d692f113 AI |
4842 | case BPF_FUNC_get_socket_cookie: |
4843 | return &bpf_get_socket_cookie_sock_addr_proto; | |
cd339431 RG |
4844 | case BPF_FUNC_get_local_storage: |
4845 | return &bpf_get_local_storage_proto; | |
4fbac77d AI |
4846 | default: |
4847 | return bpf_base_func_proto(func_id); | |
4848 | } | |
4849 | } | |
4850 | ||
2492d3b8 | 4851 | static const struct bpf_func_proto * |
5e43f899 | 4852 | sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
2492d3b8 DB |
4853 | { |
4854 | switch (func_id) { | |
4855 | case BPF_FUNC_skb_load_bytes: | |
4856 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
4857 | case BPF_FUNC_skb_load_bytes_relative: |
4858 | return &bpf_skb_load_bytes_relative_proto; | |
91b8270f CF |
4859 | case BPF_FUNC_get_socket_cookie: |
4860 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
4861 | case BPF_FUNC_get_socket_uid: |
4862 | return &bpf_get_socket_uid_proto; | |
2492d3b8 DB |
4863 | default: |
4864 | return bpf_base_func_proto(func_id); | |
4865 | } | |
4866 | } | |
4867 | ||
cd339431 RG |
4868 | static const struct bpf_func_proto * |
4869 | cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
4870 | { | |
4871 | switch (func_id) { | |
4872 | case BPF_FUNC_get_local_storage: | |
4873 | return &bpf_get_local_storage_proto; | |
4874 | default: | |
4875 | return sk_filter_func_proto(func_id, prog); | |
4876 | } | |
4877 | } | |
4878 | ||
608cd71a | 4879 | static const struct bpf_func_proto * |
5e43f899 | 4880 | tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
608cd71a AS |
4881 | { |
4882 | switch (func_id) { | |
4883 | case BPF_FUNC_skb_store_bytes: | |
4884 | return &bpf_skb_store_bytes_proto; | |
05c74e5e DB |
4885 | case BPF_FUNC_skb_load_bytes: |
4886 | return &bpf_skb_load_bytes_proto; | |
4e1ec56c DB |
4887 | case BPF_FUNC_skb_load_bytes_relative: |
4888 | return &bpf_skb_load_bytes_relative_proto; | |
36bbef52 DB |
4889 | case BPF_FUNC_skb_pull_data: |
4890 | return &bpf_skb_pull_data_proto; | |
7d672345 DB |
4891 | case BPF_FUNC_csum_diff: |
4892 | return &bpf_csum_diff_proto; | |
36bbef52 DB |
4893 | case BPF_FUNC_csum_update: |
4894 | return &bpf_csum_update_proto; | |
91bc4822 AS |
4895 | case BPF_FUNC_l3_csum_replace: |
4896 | return &bpf_l3_csum_replace_proto; | |
4897 | case BPF_FUNC_l4_csum_replace: | |
4898 | return &bpf_l4_csum_replace_proto; | |
3896d655 AS |
4899 | case BPF_FUNC_clone_redirect: |
4900 | return &bpf_clone_redirect_proto; | |
8d20aabe DB |
4901 | case BPF_FUNC_get_cgroup_classid: |
4902 | return &bpf_get_cgroup_classid_proto; | |
4e10df9a AS |
4903 | case BPF_FUNC_skb_vlan_push: |
4904 | return &bpf_skb_vlan_push_proto; | |
4905 | case BPF_FUNC_skb_vlan_pop: | |
4906 | return &bpf_skb_vlan_pop_proto; | |
6578171a DB |
4907 | case BPF_FUNC_skb_change_proto: |
4908 | return &bpf_skb_change_proto_proto; | |
d2485c42 DB |
4909 | case BPF_FUNC_skb_change_type: |
4910 | return &bpf_skb_change_type_proto; | |
2be7e212 DB |
4911 | case BPF_FUNC_skb_adjust_room: |
4912 | return &bpf_skb_adjust_room_proto; | |
5293efe6 DB |
4913 | case BPF_FUNC_skb_change_tail: |
4914 | return &bpf_skb_change_tail_proto; | |
d3aa45ce AS |
4915 | case BPF_FUNC_skb_get_tunnel_key: |
4916 | return &bpf_skb_get_tunnel_key_proto; | |
4917 | case BPF_FUNC_skb_set_tunnel_key: | |
14ca0751 DB |
4918 | return bpf_get_skb_set_tunnel_proto(func_id); |
4919 | case BPF_FUNC_skb_get_tunnel_opt: | |
4920 | return &bpf_skb_get_tunnel_opt_proto; | |
4921 | case BPF_FUNC_skb_set_tunnel_opt: | |
4922 | return bpf_get_skb_set_tunnel_proto(func_id); | |
27b29f63 AS |
4923 | case BPF_FUNC_redirect: |
4924 | return &bpf_redirect_proto; | |
c46646d0 DB |
4925 | case BPF_FUNC_get_route_realm: |
4926 | return &bpf_get_route_realm_proto; | |
13c5c240 DB |
4927 | case BPF_FUNC_get_hash_recalc: |
4928 | return &bpf_get_hash_recalc_proto; | |
7a4b28c6 DB |
4929 | case BPF_FUNC_set_hash_invalid: |
4930 | return &bpf_set_hash_invalid_proto; | |
ded092cd DB |
4931 | case BPF_FUNC_set_hash: |
4932 | return &bpf_set_hash_proto; | |
bd570ff9 | 4933 | case BPF_FUNC_perf_event_output: |
555c8a86 | 4934 | return &bpf_skb_event_output_proto; |
80b48c44 DB |
4935 | case BPF_FUNC_get_smp_processor_id: |
4936 | return &bpf_get_smp_processor_id_proto; | |
747ea55e DB |
4937 | case BPF_FUNC_skb_under_cgroup: |
4938 | return &bpf_skb_under_cgroup_proto; | |
91b8270f CF |
4939 | case BPF_FUNC_get_socket_cookie: |
4940 | return &bpf_get_socket_cookie_proto; | |
6acc5c29 CF |
4941 | case BPF_FUNC_get_socket_uid: |
4942 | return &bpf_get_socket_uid_proto; | |
cb20b08e DB |
4943 | case BPF_FUNC_fib_lookup: |
4944 | return &bpf_skb_fib_lookup_proto; | |
12bed760 EB |
4945 | #ifdef CONFIG_XFRM |
4946 | case BPF_FUNC_skb_get_xfrm_state: | |
4947 | return &bpf_skb_get_xfrm_state_proto; | |
4948 | #endif | |
cb20b08e DB |
4949 | #ifdef CONFIG_SOCK_CGROUP_DATA |
4950 | case BPF_FUNC_skb_cgroup_id: | |
4951 | return &bpf_skb_cgroup_id_proto; | |
4952 | #endif | |
608cd71a | 4953 | default: |
2492d3b8 | 4954 | return bpf_base_func_proto(func_id); |
608cd71a AS |
4955 | } |
4956 | } | |
4957 | ||
6a773a15 | 4958 | static const struct bpf_func_proto * |
5e43f899 | 4959 | xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
6a773a15 | 4960 | { |
4de16969 DB |
4961 | switch (func_id) { |
4962 | case BPF_FUNC_perf_event_output: | |
4963 | return &bpf_xdp_event_output_proto; | |
669dc4d7 DB |
4964 | case BPF_FUNC_get_smp_processor_id: |
4965 | return &bpf_get_smp_processor_id_proto; | |
205c3807 DB |
4966 | case BPF_FUNC_csum_diff: |
4967 | return &bpf_csum_diff_proto; | |
17bedab2 MKL |
4968 | case BPF_FUNC_xdp_adjust_head: |
4969 | return &bpf_xdp_adjust_head_proto; | |
de8f3a83 DB |
4970 | case BPF_FUNC_xdp_adjust_meta: |
4971 | return &bpf_xdp_adjust_meta_proto; | |
814abfab JF |
4972 | case BPF_FUNC_redirect: |
4973 | return &bpf_xdp_redirect_proto; | |
97f91a7c | 4974 | case BPF_FUNC_redirect_map: |
e4a8e817 | 4975 | return &bpf_xdp_redirect_map_proto; |
b32cc5b9 NS |
4976 | case BPF_FUNC_xdp_adjust_tail: |
4977 | return &bpf_xdp_adjust_tail_proto; | |
87f5fc7e DA |
4978 | case BPF_FUNC_fib_lookup: |
4979 | return &bpf_xdp_fib_lookup_proto; | |
4de16969 | 4980 | default: |
2492d3b8 | 4981 | return bpf_base_func_proto(func_id); |
4de16969 | 4982 | } |
6a773a15 BB |
4983 | } |
4984 | ||
8c4b4c7e | 4985 | static const struct bpf_func_proto * |
5e43f899 | 4986 | sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
8c4b4c7e LB |
4987 | { |
4988 | switch (func_id) { | |
4989 | case BPF_FUNC_setsockopt: | |
4990 | return &bpf_setsockopt_proto; | |
cd86d1fd LB |
4991 | case BPF_FUNC_getsockopt: |
4992 | return &bpf_getsockopt_proto; | |
b13d8807 LB |
4993 | case BPF_FUNC_sock_ops_cb_flags_set: |
4994 | return &bpf_sock_ops_cb_flags_set_proto; | |
174a79ff JF |
4995 | case BPF_FUNC_sock_map_update: |
4996 | return &bpf_sock_map_update_proto; | |
81110384 JF |
4997 | case BPF_FUNC_sock_hash_update: |
4998 | return &bpf_sock_hash_update_proto; | |
d692f113 AI |
4999 | case BPF_FUNC_get_socket_cookie: |
5000 | return &bpf_get_socket_cookie_sock_ops_proto; | |
cd339431 RG |
5001 | case BPF_FUNC_get_local_storage: |
5002 | return &bpf_get_local_storage_proto; | |
8c4b4c7e LB |
5003 | default: |
5004 | return bpf_base_func_proto(func_id); | |
5005 | } | |
5006 | } | |
5007 | ||
5e43f899 AI |
5008 | static const struct bpf_func_proto * |
5009 | sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
4f738adb JF |
5010 | { |
5011 | switch (func_id) { | |
5012 | case BPF_FUNC_msg_redirect_map: | |
5013 | return &bpf_msg_redirect_map_proto; | |
81110384 JF |
5014 | case BPF_FUNC_msg_redirect_hash: |
5015 | return &bpf_msg_redirect_hash_proto; | |
2a100317 JF |
5016 | case BPF_FUNC_msg_apply_bytes: |
5017 | return &bpf_msg_apply_bytes_proto; | |
91843d54 JF |
5018 | case BPF_FUNC_msg_cork_bytes: |
5019 | return &bpf_msg_cork_bytes_proto; | |
015632bb JF |
5020 | case BPF_FUNC_msg_pull_data: |
5021 | return &bpf_msg_pull_data_proto; | |
cd339431 RG |
5022 | case BPF_FUNC_get_local_storage: |
5023 | return &bpf_get_local_storage_proto; | |
4f738adb JF |
5024 | default: |
5025 | return bpf_base_func_proto(func_id); | |
5026 | } | |
5027 | } | |
5028 | ||
5e43f899 AI |
5029 | static const struct bpf_func_proto * |
5030 | sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
b005fd18 JF |
5031 | { |
5032 | switch (func_id) { | |
8a31db56 JF |
5033 | case BPF_FUNC_skb_store_bytes: |
5034 | return &bpf_skb_store_bytes_proto; | |
b005fd18 JF |
5035 | case BPF_FUNC_skb_load_bytes: |
5036 | return &bpf_skb_load_bytes_proto; | |
8a31db56 | 5037 | case BPF_FUNC_skb_pull_data: |
0ea488ff | 5038 | return &sk_skb_pull_data_proto; |
8a31db56 | 5039 | case BPF_FUNC_skb_change_tail: |
0ea488ff | 5040 | return &sk_skb_change_tail_proto; |
8a31db56 | 5041 | case BPF_FUNC_skb_change_head: |
0ea488ff | 5042 | return &sk_skb_change_head_proto; |
b005fd18 JF |
5043 | case BPF_FUNC_get_socket_cookie: |
5044 | return &bpf_get_socket_cookie_proto; | |
5045 | case BPF_FUNC_get_socket_uid: | |
5046 | return &bpf_get_socket_uid_proto; | |
174a79ff JF |
5047 | case BPF_FUNC_sk_redirect_map: |
5048 | return &bpf_sk_redirect_map_proto; | |
81110384 JF |
5049 | case BPF_FUNC_sk_redirect_hash: |
5050 | return &bpf_sk_redirect_hash_proto; | |
cd339431 RG |
5051 | case BPF_FUNC_get_local_storage: |
5052 | return &bpf_get_local_storage_proto; | |
b005fd18 JF |
5053 | default: |
5054 | return bpf_base_func_proto(func_id); | |
5055 | } | |
5056 | } | |
5057 | ||
cd3092c7 MX |
5058 | static const struct bpf_func_proto * |
5059 | lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5060 | { | |
5061 | switch (func_id) { | |
5062 | case BPF_FUNC_skb_load_bytes: | |
5063 | return &bpf_skb_load_bytes_proto; | |
5064 | case BPF_FUNC_skb_pull_data: | |
5065 | return &bpf_skb_pull_data_proto; | |
5066 | case BPF_FUNC_csum_diff: | |
5067 | return &bpf_csum_diff_proto; | |
5068 | case BPF_FUNC_get_cgroup_classid: | |
5069 | return &bpf_get_cgroup_classid_proto; | |
5070 | case BPF_FUNC_get_route_realm: | |
5071 | return &bpf_get_route_realm_proto; | |
5072 | case BPF_FUNC_get_hash_recalc: | |
5073 | return &bpf_get_hash_recalc_proto; | |
5074 | case BPF_FUNC_perf_event_output: | |
5075 | return &bpf_skb_event_output_proto; | |
5076 | case BPF_FUNC_get_smp_processor_id: | |
5077 | return &bpf_get_smp_processor_id_proto; | |
5078 | case BPF_FUNC_skb_under_cgroup: | |
5079 | return &bpf_skb_under_cgroup_proto; | |
5080 | default: | |
5081 | return bpf_base_func_proto(func_id); | |
5082 | } | |
5083 | } | |
5084 | ||
5085 | static const struct bpf_func_proto * | |
5086 | lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5087 | { | |
5088 | switch (func_id) { | |
5089 | case BPF_FUNC_lwt_push_encap: | |
5090 | return &bpf_lwt_push_encap_proto; | |
5091 | default: | |
5092 | return lwt_out_func_proto(func_id, prog); | |
5093 | } | |
5094 | } | |
5095 | ||
3a0af8fd | 5096 | static const struct bpf_func_proto * |
5e43f899 | 5097 | lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
3a0af8fd TG |
5098 | { |
5099 | switch (func_id) { | |
5100 | case BPF_FUNC_skb_get_tunnel_key: | |
5101 | return &bpf_skb_get_tunnel_key_proto; | |
5102 | case BPF_FUNC_skb_set_tunnel_key: | |
5103 | return bpf_get_skb_set_tunnel_proto(func_id); | |
5104 | case BPF_FUNC_skb_get_tunnel_opt: | |
5105 | return &bpf_skb_get_tunnel_opt_proto; | |
5106 | case BPF_FUNC_skb_set_tunnel_opt: | |
5107 | return bpf_get_skb_set_tunnel_proto(func_id); | |
5108 | case BPF_FUNC_redirect: | |
5109 | return &bpf_redirect_proto; | |
5110 | case BPF_FUNC_clone_redirect: | |
5111 | return &bpf_clone_redirect_proto; | |
5112 | case BPF_FUNC_skb_change_tail: | |
5113 | return &bpf_skb_change_tail_proto; | |
5114 | case BPF_FUNC_skb_change_head: | |
5115 | return &bpf_skb_change_head_proto; | |
5116 | case BPF_FUNC_skb_store_bytes: | |
5117 | return &bpf_skb_store_bytes_proto; | |
5118 | case BPF_FUNC_csum_update: | |
5119 | return &bpf_csum_update_proto; | |
5120 | case BPF_FUNC_l3_csum_replace: | |
5121 | return &bpf_l3_csum_replace_proto; | |
5122 | case BPF_FUNC_l4_csum_replace: | |
5123 | return &bpf_l4_csum_replace_proto; | |
5124 | case BPF_FUNC_set_hash_invalid: | |
5125 | return &bpf_set_hash_invalid_proto; | |
5126 | default: | |
cd3092c7 | 5127 | return lwt_out_func_proto(func_id, prog); |
3a0af8fd TG |
5128 | } |
5129 | } | |
5130 | ||
004d4b27 MX |
5131 | static const struct bpf_func_proto * |
5132 | lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) | |
5133 | { | |
5134 | switch (func_id) { | |
61d76980 | 5135 | #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
004d4b27 MX |
5136 | case BPF_FUNC_lwt_seg6_store_bytes: |
5137 | return &bpf_lwt_seg6_store_bytes_proto; | |
5138 | case BPF_FUNC_lwt_seg6_action: | |
5139 | return &bpf_lwt_seg6_action_proto; | |
5140 | case BPF_FUNC_lwt_seg6_adjust_srh: | |
5141 | return &bpf_lwt_seg6_adjust_srh_proto; | |
61d76980 | 5142 | #endif |
004d4b27 MX |
5143 | default: |
5144 | return lwt_out_func_proto(func_id, prog); | |
3a0af8fd TG |
5145 | } |
5146 | } | |
5147 | ||
f96da094 | 5148 | static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
5e43f899 | 5149 | const struct bpf_prog *prog, |
f96da094 | 5150 | struct bpf_insn_access_aux *info) |
23994631 | 5151 | { |
f96da094 | 5152 | const int size_default = sizeof(__u32); |
23994631 | 5153 | |
9bac3d6d AS |
5154 | if (off < 0 || off >= sizeof(struct __sk_buff)) |
5155 | return false; | |
62c7989b | 5156 | |
4936e352 | 5157 | /* The verifier guarantees that size > 0. */ |
9bac3d6d AS |
5158 | if (off % size != 0) |
5159 | return false; | |
62c7989b DB |
5160 | |
5161 | switch (off) { | |
f96da094 DB |
5162 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
5163 | if (off + size > offsetofend(struct __sk_buff, cb[4])) | |
62c7989b DB |
5164 | return false; |
5165 | break; | |
8a31db56 JF |
5166 | case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
5167 | case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): | |
5168 | case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): | |
5169 | case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): | |
f96da094 | 5170 | case bpf_ctx_range(struct __sk_buff, data): |
de8f3a83 | 5171 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 DB |
5172 | case bpf_ctx_range(struct __sk_buff, data_end): |
5173 | if (size != size_default) | |
23994631 | 5174 | return false; |
31fd8581 YS |
5175 | break; |
5176 | default: | |
f96da094 | 5177 | /* Only narrow read access allowed for now. */ |
31fd8581 | 5178 | if (type == BPF_WRITE) { |
f96da094 | 5179 | if (size != size_default) |
31fd8581 YS |
5180 | return false; |
5181 | } else { | |
f96da094 DB |
5182 | bpf_ctx_record_field_size(info, size_default); |
5183 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
23994631 | 5184 | return false; |
31fd8581 | 5185 | } |
62c7989b | 5186 | } |
9bac3d6d AS |
5187 | |
5188 | return true; | |
5189 | } | |
5190 | ||
d691f9e8 | 5191 | static bool sk_filter_is_valid_access(int off, int size, |
19de99f7 | 5192 | enum bpf_access_type type, |
5e43f899 | 5193 | const struct bpf_prog *prog, |
23994631 | 5194 | struct bpf_insn_access_aux *info) |
d691f9e8 | 5195 | { |
db58ba45 | 5196 | switch (off) { |
f96da094 DB |
5197 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
5198 | case bpf_ctx_range(struct __sk_buff, data): | |
de8f3a83 | 5199 | case bpf_ctx_range(struct __sk_buff, data_meta): |
f96da094 | 5200 | case bpf_ctx_range(struct __sk_buff, data_end): |
8a31db56 | 5201 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
045efa82 | 5202 | return false; |
db58ba45 | 5203 | } |
045efa82 | 5204 | |
d691f9e8 AS |
5205 | if (type == BPF_WRITE) { |
5206 | switch (off) { | |
f96da094 | 5207 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
d691f9e8 AS |
5208 | break; |
5209 | default: | |
5210 | return false; | |
5211 | } | |
5212 | } | |
5213 | ||
5e43f899 | 5214 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
5215 | } |
5216 | ||
3a0af8fd TG |
5217 | static bool lwt_is_valid_access(int off, int size, |
5218 | enum bpf_access_type type, | |
5e43f899 | 5219 | const struct bpf_prog *prog, |
23994631 | 5220 | struct bpf_insn_access_aux *info) |
3a0af8fd TG |
5221 | { |
5222 | switch (off) { | |
f96da094 | 5223 | case bpf_ctx_range(struct __sk_buff, tc_classid): |
8a31db56 | 5224 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
de8f3a83 | 5225 | case bpf_ctx_range(struct __sk_buff, data_meta): |
3a0af8fd TG |
5226 | return false; |
5227 | } | |
5228 | ||
5229 | if (type == BPF_WRITE) { | |
5230 | switch (off) { | |
f96da094 DB |
5231 | case bpf_ctx_range(struct __sk_buff, mark): |
5232 | case bpf_ctx_range(struct __sk_buff, priority): | |
5233 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
3a0af8fd TG |
5234 | break; |
5235 | default: | |
5236 | return false; | |
5237 | } | |
5238 | } | |
5239 | ||
f96da094 DB |
5240 | switch (off) { |
5241 | case bpf_ctx_range(struct __sk_buff, data): | |
5242 | info->reg_type = PTR_TO_PACKET; | |
5243 | break; | |
5244 | case bpf_ctx_range(struct __sk_buff, data_end): | |
5245 | info->reg_type = PTR_TO_PACKET_END; | |
5246 | break; | |
5247 | } | |
5248 | ||
5e43f899 | 5249 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
3a0af8fd TG |
5250 | } |
5251 | ||
aac3fc32 AI |
5252 | /* Attach type specific accesses */ |
5253 | static bool __sock_filter_check_attach_type(int off, | |
5254 | enum bpf_access_type access_type, | |
5255 | enum bpf_attach_type attach_type) | |
61023658 | 5256 | { |
aac3fc32 AI |
5257 | switch (off) { |
5258 | case offsetof(struct bpf_sock, bound_dev_if): | |
5259 | case offsetof(struct bpf_sock, mark): | |
5260 | case offsetof(struct bpf_sock, priority): | |
5261 | switch (attach_type) { | |
5262 | case BPF_CGROUP_INET_SOCK_CREATE: | |
5263 | goto full_access; | |
5264 | default: | |
5265 | return false; | |
5266 | } | |
5267 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
5268 | switch (attach_type) { | |
5269 | case BPF_CGROUP_INET4_POST_BIND: | |
5270 | goto read_only; | |
5271 | default: | |
5272 | return false; | |
5273 | } | |
5274 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
5275 | switch (attach_type) { | |
5276 | case BPF_CGROUP_INET6_POST_BIND: | |
5277 | goto read_only; | |
5278 | default: | |
5279 | return false; | |
5280 | } | |
5281 | case bpf_ctx_range(struct bpf_sock, src_port): | |
5282 | switch (attach_type) { | |
5283 | case BPF_CGROUP_INET4_POST_BIND: | |
5284 | case BPF_CGROUP_INET6_POST_BIND: | |
5285 | goto read_only; | |
61023658 DA |
5286 | default: |
5287 | return false; | |
5288 | } | |
5289 | } | |
aac3fc32 AI |
5290 | read_only: |
5291 | return access_type == BPF_READ; | |
5292 | full_access: | |
5293 | return true; | |
5294 | } | |
5295 | ||
5296 | static bool __sock_filter_check_size(int off, int size, | |
5297 | struct bpf_insn_access_aux *info) | |
5298 | { | |
5299 | const int size_default = sizeof(__u32); | |
61023658 | 5300 | |
aac3fc32 AI |
5301 | switch (off) { |
5302 | case bpf_ctx_range(struct bpf_sock, src_ip4): | |
5303 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
5304 | bpf_ctx_record_field_size(info, size_default); | |
5305 | return bpf_ctx_narrow_access_ok(off, size, size_default); | |
5306 | } | |
5307 | ||
5308 | return size == size_default; | |
5309 | } | |
5310 | ||
5311 | static bool sock_filter_is_valid_access(int off, int size, | |
5312 | enum bpf_access_type type, | |
5313 | const struct bpf_prog *prog, | |
5314 | struct bpf_insn_access_aux *info) | |
5315 | { | |
5316 | if (off < 0 || off >= sizeof(struct bpf_sock)) | |
61023658 | 5317 | return false; |
61023658 DA |
5318 | if (off % size != 0) |
5319 | return false; | |
aac3fc32 AI |
5320 | if (!__sock_filter_check_attach_type(off, type, |
5321 | prog->expected_attach_type)) | |
5322 | return false; | |
5323 | if (!__sock_filter_check_size(off, size, info)) | |
61023658 | 5324 | return false; |
61023658 DA |
5325 | return true; |
5326 | } | |
5327 | ||
047b0ecd DB |
5328 | static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
5329 | const struct bpf_prog *prog, int drop_verdict) | |
36bbef52 DB |
5330 | { |
5331 | struct bpf_insn *insn = insn_buf; | |
5332 | ||
5333 | if (!direct_write) | |
5334 | return 0; | |
5335 | ||
5336 | /* if (!skb->cloned) | |
5337 | * goto start; | |
5338 | * | |
5339 | * (Fast-path, otherwise approximation that we might be | |
5340 | * a clone, do the rest in helper.) | |
5341 | */ | |
5342 | *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); | |
5343 | *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); | |
5344 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); | |
5345 | ||
5346 | /* ret = bpf_skb_pull_data(skb, 0); */ | |
5347 | *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); | |
5348 | *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); | |
5349 | *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, | |
5350 | BPF_FUNC_skb_pull_data); | |
5351 | /* if (!ret) | |
5352 | * goto restore; | |
5353 | * return TC_ACT_SHOT; | |
5354 | */ | |
5355 | *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); | |
047b0ecd | 5356 | *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
36bbef52 DB |
5357 | *insn++ = BPF_EXIT_INSN(); |
5358 | ||
5359 | /* restore: */ | |
5360 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); | |
5361 | /* start: */ | |
5362 | *insn++ = prog->insnsi[0]; | |
5363 | ||
5364 | return insn - insn_buf; | |
5365 | } | |
5366 | ||
e0cea7ce DB |
5367 | static int bpf_gen_ld_abs(const struct bpf_insn *orig, |
5368 | struct bpf_insn *insn_buf) | |
5369 | { | |
5370 | bool indirect = BPF_MODE(orig->code) == BPF_IND; | |
5371 | struct bpf_insn *insn = insn_buf; | |
5372 | ||
5373 | /* We're guaranteed here that CTX is in R6. */ | |
5374 | *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); | |
5375 | if (!indirect) { | |
5376 | *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); | |
5377 | } else { | |
5378 | *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); | |
5379 | if (orig->imm) | |
5380 | *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); | |
5381 | } | |
5382 | ||
5383 | switch (BPF_SIZE(orig->code)) { | |
5384 | case BPF_B: | |
5385 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); | |
5386 | break; | |
5387 | case BPF_H: | |
5388 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); | |
5389 | break; | |
5390 | case BPF_W: | |
5391 | *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); | |
5392 | break; | |
5393 | } | |
5394 | ||
5395 | *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); | |
5396 | *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); | |
5397 | *insn++ = BPF_EXIT_INSN(); | |
5398 | ||
5399 | return insn - insn_buf; | |
5400 | } | |
5401 | ||
047b0ecd DB |
5402 | static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
5403 | const struct bpf_prog *prog) | |
5404 | { | |
5405 | return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); | |
5406 | } | |
5407 | ||
d691f9e8 | 5408 | static bool tc_cls_act_is_valid_access(int off, int size, |
19de99f7 | 5409 | enum bpf_access_type type, |
5e43f899 | 5410 | const struct bpf_prog *prog, |
23994631 | 5411 | struct bpf_insn_access_aux *info) |
d691f9e8 AS |
5412 | { |
5413 | if (type == BPF_WRITE) { | |
5414 | switch (off) { | |
f96da094 DB |
5415 | case bpf_ctx_range(struct __sk_buff, mark): |
5416 | case bpf_ctx_range(struct __sk_buff, tc_index): | |
5417 | case bpf_ctx_range(struct __sk_buff, priority): | |
5418 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
5419 | case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): | |
d691f9e8 AS |
5420 | break; |
5421 | default: | |
5422 | return false; | |
5423 | } | |
5424 | } | |
19de99f7 | 5425 | |
f96da094 DB |
5426 | switch (off) { |
5427 | case bpf_ctx_range(struct __sk_buff, data): | |
5428 | info->reg_type = PTR_TO_PACKET; | |
5429 | break; | |
de8f3a83 DB |
5430 | case bpf_ctx_range(struct __sk_buff, data_meta): |
5431 | info->reg_type = PTR_TO_PACKET_META; | |
5432 | break; | |
f96da094 DB |
5433 | case bpf_ctx_range(struct __sk_buff, data_end): |
5434 | info->reg_type = PTR_TO_PACKET_END; | |
5435 | break; | |
8a31db56 JF |
5436 | case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
5437 | return false; | |
f96da094 DB |
5438 | } |
5439 | ||
5e43f899 | 5440 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
d691f9e8 AS |
5441 | } |
5442 | ||
1afaf661 | 5443 | static bool __is_valid_xdp_access(int off, int size) |
6a773a15 BB |
5444 | { |
5445 | if (off < 0 || off >= sizeof(struct xdp_md)) | |
5446 | return false; | |
5447 | if (off % size != 0) | |
5448 | return false; | |
6088b582 | 5449 | if (size != sizeof(__u32)) |
6a773a15 BB |
5450 | return false; |
5451 | ||
5452 | return true; | |
5453 | } | |
5454 | ||
5455 | static bool xdp_is_valid_access(int off, int size, | |
5456 | enum bpf_access_type type, | |
5e43f899 | 5457 | const struct bpf_prog *prog, |
23994631 | 5458 | struct bpf_insn_access_aux *info) |
6a773a15 | 5459 | { |
0d830032 JK |
5460 | if (type == BPF_WRITE) { |
5461 | if (bpf_prog_is_dev_bound(prog->aux)) { | |
5462 | switch (off) { | |
5463 | case offsetof(struct xdp_md, rx_queue_index): | |
5464 | return __is_valid_xdp_access(off, size); | |
5465 | } | |
5466 | } | |
6a773a15 | 5467 | return false; |
0d830032 | 5468 | } |
6a773a15 BB |
5469 | |
5470 | switch (off) { | |
5471 | case offsetof(struct xdp_md, data): | |
23994631 | 5472 | info->reg_type = PTR_TO_PACKET; |
6a773a15 | 5473 | break; |
de8f3a83 DB |
5474 | case offsetof(struct xdp_md, data_meta): |
5475 | info->reg_type = PTR_TO_PACKET_META; | |
5476 | break; | |
6a773a15 | 5477 | case offsetof(struct xdp_md, data_end): |
23994631 | 5478 | info->reg_type = PTR_TO_PACKET_END; |
6a773a15 BB |
5479 | break; |
5480 | } | |
5481 | ||
1afaf661 | 5482 | return __is_valid_xdp_access(off, size); |
6a773a15 BB |
5483 | } |
5484 | ||
5485 | void bpf_warn_invalid_xdp_action(u32 act) | |
5486 | { | |
9beb8bed DB |
5487 | const u32 act_max = XDP_REDIRECT; |
5488 | ||
5489 | WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", | |
5490 | act > act_max ? "Illegal" : "Driver unsupported", | |
5491 | act); | |
6a773a15 BB |
5492 | } |
5493 | EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); | |
5494 | ||
4fbac77d AI |
5495 | static bool sock_addr_is_valid_access(int off, int size, |
5496 | enum bpf_access_type type, | |
5497 | const struct bpf_prog *prog, | |
5498 | struct bpf_insn_access_aux *info) | |
5499 | { | |
5500 | const int size_default = sizeof(__u32); | |
5501 | ||
5502 | if (off < 0 || off >= sizeof(struct bpf_sock_addr)) | |
5503 | return false; | |
5504 | if (off % size != 0) | |
5505 | return false; | |
5506 | ||
5507 | /* Disallow access to IPv6 fields from IPv4 contex and vise | |
5508 | * versa. | |
5509 | */ | |
5510 | switch (off) { | |
5511 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
5512 | switch (prog->expected_attach_type) { | |
5513 | case BPF_CGROUP_INET4_BIND: | |
d74bad4e | 5514 | case BPF_CGROUP_INET4_CONNECT: |
1cedee13 | 5515 | case BPF_CGROUP_UDP4_SENDMSG: |
4fbac77d AI |
5516 | break; |
5517 | default: | |
5518 | return false; | |
5519 | } | |
5520 | break; | |
5521 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
5522 | switch (prog->expected_attach_type) { | |
5523 | case BPF_CGROUP_INET6_BIND: | |
d74bad4e | 5524 | case BPF_CGROUP_INET6_CONNECT: |
1cedee13 AI |
5525 | case BPF_CGROUP_UDP6_SENDMSG: |
5526 | break; | |
5527 | default: | |
5528 | return false; | |
5529 | } | |
5530 | break; | |
5531 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): | |
5532 | switch (prog->expected_attach_type) { | |
5533 | case BPF_CGROUP_UDP4_SENDMSG: | |
5534 | break; | |
5535 | default: | |
5536 | return false; | |
5537 | } | |
5538 | break; | |
5539 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
5540 | msg_src_ip6[3]): | |
5541 | switch (prog->expected_attach_type) { | |
5542 | case BPF_CGROUP_UDP6_SENDMSG: | |
4fbac77d AI |
5543 | break; |
5544 | default: | |
5545 | return false; | |
5546 | } | |
5547 | break; | |
5548 | } | |
5549 | ||
5550 | switch (off) { | |
5551 | case bpf_ctx_range(struct bpf_sock_addr, user_ip4): | |
5552 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
1cedee13 AI |
5553 | case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): |
5554 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
5555 | msg_src_ip6[3]): | |
4fbac77d AI |
5556 | /* Only narrow read access allowed for now. */ |
5557 | if (type == BPF_READ) { | |
5558 | bpf_ctx_record_field_size(info, size_default); | |
5559 | if (!bpf_ctx_narrow_access_ok(off, size, size_default)) | |
5560 | return false; | |
5561 | } else { | |
5562 | if (size != size_default) | |
5563 | return false; | |
5564 | } | |
5565 | break; | |
5566 | case bpf_ctx_range(struct bpf_sock_addr, user_port): | |
5567 | if (size != size_default) | |
5568 | return false; | |
5569 | break; | |
5570 | default: | |
5571 | if (type == BPF_READ) { | |
5572 | if (size != size_default) | |
5573 | return false; | |
5574 | } else { | |
5575 | return false; | |
5576 | } | |
5577 | } | |
5578 | ||
5579 | return true; | |
5580 | } | |
5581 | ||
44f0e430 LB |
5582 | static bool sock_ops_is_valid_access(int off, int size, |
5583 | enum bpf_access_type type, | |
5e43f899 | 5584 | const struct bpf_prog *prog, |
44f0e430 | 5585 | struct bpf_insn_access_aux *info) |
40304b2a | 5586 | { |
44f0e430 LB |
5587 | const int size_default = sizeof(__u32); |
5588 | ||
40304b2a LB |
5589 | if (off < 0 || off >= sizeof(struct bpf_sock_ops)) |
5590 | return false; | |
44f0e430 | 5591 | |
40304b2a LB |
5592 | /* The verifier guarantees that size > 0. */ |
5593 | if (off % size != 0) | |
5594 | return false; | |
40304b2a | 5595 | |
40304b2a LB |
5596 | if (type == BPF_WRITE) { |
5597 | switch (off) { | |
2585cd62 | 5598 | case offsetof(struct bpf_sock_ops, reply): |
6f9bd3d7 | 5599 | case offsetof(struct bpf_sock_ops, sk_txhash): |
44f0e430 LB |
5600 | if (size != size_default) |
5601 | return false; | |
40304b2a LB |
5602 | break; |
5603 | default: | |
5604 | return false; | |
5605 | } | |
44f0e430 LB |
5606 | } else { |
5607 | switch (off) { | |
5608 | case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, | |
5609 | bytes_acked): | |
5610 | if (size != sizeof(__u64)) | |
5611 | return false; | |
5612 | break; | |
5613 | default: | |
5614 | if (size != size_default) | |
5615 | return false; | |
5616 | break; | |
5617 | } | |
40304b2a LB |
5618 | } |
5619 | ||
44f0e430 | 5620 | return true; |
40304b2a LB |
5621 | } |
5622 | ||
8a31db56 JF |
5623 | static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
5624 | const struct bpf_prog *prog) | |
5625 | { | |
047b0ecd | 5626 | return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
8a31db56 JF |
5627 | } |
5628 | ||
b005fd18 JF |
5629 | static bool sk_skb_is_valid_access(int off, int size, |
5630 | enum bpf_access_type type, | |
5e43f899 | 5631 | const struct bpf_prog *prog, |
b005fd18 JF |
5632 | struct bpf_insn_access_aux *info) |
5633 | { | |
de8f3a83 DB |
5634 | switch (off) { |
5635 | case bpf_ctx_range(struct __sk_buff, tc_classid): | |
5636 | case bpf_ctx_range(struct __sk_buff, data_meta): | |
5637 | return false; | |
5638 | } | |
5639 | ||
8a31db56 JF |
5640 | if (type == BPF_WRITE) { |
5641 | switch (off) { | |
8a31db56 JF |
5642 | case bpf_ctx_range(struct __sk_buff, tc_index): |
5643 | case bpf_ctx_range(struct __sk_buff, priority): | |
5644 | break; | |
5645 | default: | |
5646 | return false; | |
5647 | } | |
5648 | } | |
5649 | ||
b005fd18 | 5650 | switch (off) { |
f7e9cb1e | 5651 | case bpf_ctx_range(struct __sk_buff, mark): |
8a31db56 | 5652 | return false; |
b005fd18 JF |
5653 | case bpf_ctx_range(struct __sk_buff, data): |
5654 | info->reg_type = PTR_TO_PACKET; | |
5655 | break; | |
5656 | case bpf_ctx_range(struct __sk_buff, data_end): | |
5657 | info->reg_type = PTR_TO_PACKET_END; | |
5658 | break; | |
5659 | } | |
5660 | ||
5e43f899 | 5661 | return bpf_skb_is_valid_access(off, size, type, prog, info); |
b005fd18 JF |
5662 | } |
5663 | ||
4f738adb JF |
5664 | static bool sk_msg_is_valid_access(int off, int size, |
5665 | enum bpf_access_type type, | |
5e43f899 | 5666 | const struct bpf_prog *prog, |
4f738adb JF |
5667 | struct bpf_insn_access_aux *info) |
5668 | { | |
5669 | if (type == BPF_WRITE) | |
5670 | return false; | |
5671 | ||
5672 | switch (off) { | |
5673 | case offsetof(struct sk_msg_md, data): | |
5674 | info->reg_type = PTR_TO_PACKET; | |
303def35 JF |
5675 | if (size != sizeof(__u64)) |
5676 | return false; | |
4f738adb JF |
5677 | break; |
5678 | case offsetof(struct sk_msg_md, data_end): | |
5679 | info->reg_type = PTR_TO_PACKET_END; | |
303def35 JF |
5680 | if (size != sizeof(__u64)) |
5681 | return false; | |
4f738adb | 5682 | break; |
303def35 JF |
5683 | default: |
5684 | if (size != sizeof(__u32)) | |
5685 | return false; | |
4f738adb JF |
5686 | } |
5687 | ||
5688 | if (off < 0 || off >= sizeof(struct sk_msg_md)) | |
5689 | return false; | |
5690 | if (off % size != 0) | |
5691 | return false; | |
4f738adb JF |
5692 | |
5693 | return true; | |
5694 | } | |
5695 | ||
2492d3b8 DB |
5696 | static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
5697 | const struct bpf_insn *si, | |
5698 | struct bpf_insn *insn_buf, | |
f96da094 | 5699 | struct bpf_prog *prog, u32 *target_size) |
9bac3d6d AS |
5700 | { |
5701 | struct bpf_insn *insn = insn_buf; | |
6b8cc1d1 | 5702 | int off; |
9bac3d6d | 5703 | |
6b8cc1d1 | 5704 | switch (si->off) { |
9bac3d6d | 5705 | case offsetof(struct __sk_buff, len): |
6b8cc1d1 | 5706 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5707 | bpf_target_off(struct sk_buff, len, 4, |
5708 | target_size)); | |
9bac3d6d AS |
5709 | break; |
5710 | ||
0b8c707d | 5711 | case offsetof(struct __sk_buff, protocol): |
6b8cc1d1 | 5712 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
5713 | bpf_target_off(struct sk_buff, protocol, 2, |
5714 | target_size)); | |
0b8c707d DB |
5715 | break; |
5716 | ||
27cd5452 | 5717 | case offsetof(struct __sk_buff, vlan_proto): |
6b8cc1d1 | 5718 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
5719 | bpf_target_off(struct sk_buff, vlan_proto, 2, |
5720 | target_size)); | |
27cd5452 MS |
5721 | break; |
5722 | ||
bcad5718 | 5723 | case offsetof(struct __sk_buff, priority): |
754f1e6a | 5724 | if (type == BPF_WRITE) |
6b8cc1d1 | 5725 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5726 | bpf_target_off(struct sk_buff, priority, 4, |
5727 | target_size)); | |
754f1e6a | 5728 | else |
6b8cc1d1 | 5729 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5730 | bpf_target_off(struct sk_buff, priority, 4, |
5731 | target_size)); | |
bcad5718 DB |
5732 | break; |
5733 | ||
37e82c2f | 5734 | case offsetof(struct __sk_buff, ingress_ifindex): |
6b8cc1d1 | 5735 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5736 | bpf_target_off(struct sk_buff, skb_iif, 4, |
5737 | target_size)); | |
37e82c2f AS |
5738 | break; |
5739 | ||
5740 | case offsetof(struct __sk_buff, ifindex): | |
f035a515 | 5741 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 5742 | si->dst_reg, si->src_reg, |
37e82c2f | 5743 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 DB |
5744 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
5745 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
f96da094 DB |
5746 | bpf_target_off(struct net_device, ifindex, 4, |
5747 | target_size)); | |
37e82c2f AS |
5748 | break; |
5749 | ||
ba7591d8 | 5750 | case offsetof(struct __sk_buff, hash): |
6b8cc1d1 | 5751 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5752 | bpf_target_off(struct sk_buff, hash, 4, |
5753 | target_size)); | |
ba7591d8 DB |
5754 | break; |
5755 | ||
9bac3d6d | 5756 | case offsetof(struct __sk_buff, mark): |
d691f9e8 | 5757 | if (type == BPF_WRITE) |
6b8cc1d1 | 5758 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5759 | bpf_target_off(struct sk_buff, mark, 4, |
5760 | target_size)); | |
d691f9e8 | 5761 | else |
6b8cc1d1 | 5762 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5763 | bpf_target_off(struct sk_buff, mark, 4, |
5764 | target_size)); | |
d691f9e8 | 5765 | break; |
9bac3d6d AS |
5766 | |
5767 | case offsetof(struct __sk_buff, pkt_type): | |
f96da094 DB |
5768 | *target_size = 1; |
5769 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, | |
5770 | PKT_TYPE_OFFSET()); | |
5771 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); | |
5772 | #ifdef __BIG_ENDIAN_BITFIELD | |
5773 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); | |
5774 | #endif | |
5775 | break; | |
9bac3d6d AS |
5776 | |
5777 | case offsetof(struct __sk_buff, queue_mapping): | |
f96da094 DB |
5778 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
5779 | bpf_target_off(struct sk_buff, queue_mapping, 2, | |
5780 | target_size)); | |
5781 | break; | |
c2497395 | 5782 | |
c2497395 | 5783 | case offsetof(struct __sk_buff, vlan_present): |
c2497395 | 5784 | case offsetof(struct __sk_buff, vlan_tci): |
f96da094 DB |
5785 | BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000); |
5786 | ||
5787 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, | |
5788 | bpf_target_off(struct sk_buff, vlan_tci, 2, | |
5789 | target_size)); | |
5790 | if (si->off == offsetof(struct __sk_buff, vlan_tci)) { | |
5791 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, | |
5792 | ~VLAN_TAG_PRESENT); | |
5793 | } else { | |
5794 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12); | |
5795 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); | |
5796 | } | |
5797 | break; | |
d691f9e8 AS |
5798 | |
5799 | case offsetof(struct __sk_buff, cb[0]) ... | |
f96da094 | 5800 | offsetofend(struct __sk_buff, cb[4]) - 1: |
d691f9e8 | 5801 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); |
62c7989b DB |
5802 | BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
5803 | offsetof(struct qdisc_skb_cb, data)) % | |
5804 | sizeof(__u64)); | |
d691f9e8 | 5805 | |
ff936a04 | 5806 | prog->cb_access = 1; |
6b8cc1d1 DB |
5807 | off = si->off; |
5808 | off -= offsetof(struct __sk_buff, cb[0]); | |
5809 | off += offsetof(struct sk_buff, cb); | |
5810 | off += offsetof(struct qdisc_skb_cb, data); | |
d691f9e8 | 5811 | if (type == BPF_WRITE) |
62c7989b | 5812 | *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 5813 | si->src_reg, off); |
d691f9e8 | 5814 | else |
62c7989b | 5815 | *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
6b8cc1d1 | 5816 | si->src_reg, off); |
d691f9e8 AS |
5817 | break; |
5818 | ||
045efa82 | 5819 | case offsetof(struct __sk_buff, tc_classid): |
6b8cc1d1 DB |
5820 | BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); |
5821 | ||
5822 | off = si->off; | |
5823 | off -= offsetof(struct __sk_buff, tc_classid); | |
5824 | off += offsetof(struct sk_buff, cb); | |
5825 | off += offsetof(struct qdisc_skb_cb, tc_classid); | |
f96da094 | 5826 | *target_size = 2; |
09c37a2c | 5827 | if (type == BPF_WRITE) |
6b8cc1d1 DB |
5828 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
5829 | si->src_reg, off); | |
09c37a2c | 5830 | else |
6b8cc1d1 DB |
5831 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
5832 | si->src_reg, off); | |
045efa82 DB |
5833 | break; |
5834 | ||
db58ba45 | 5835 | case offsetof(struct __sk_buff, data): |
f035a515 | 5836 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
6b8cc1d1 | 5837 | si->dst_reg, si->src_reg, |
db58ba45 AS |
5838 | offsetof(struct sk_buff, data)); |
5839 | break; | |
5840 | ||
de8f3a83 DB |
5841 | case offsetof(struct __sk_buff, data_meta): |
5842 | off = si->off; | |
5843 | off -= offsetof(struct __sk_buff, data_meta); | |
5844 | off += offsetof(struct sk_buff, cb); | |
5845 | off += offsetof(struct bpf_skb_data_end, data_meta); | |
5846 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
5847 | si->src_reg, off); | |
5848 | break; | |
5849 | ||
db58ba45 | 5850 | case offsetof(struct __sk_buff, data_end): |
6b8cc1d1 DB |
5851 | off = si->off; |
5852 | off -= offsetof(struct __sk_buff, data_end); | |
5853 | off += offsetof(struct sk_buff, cb); | |
5854 | off += offsetof(struct bpf_skb_data_end, data_end); | |
5855 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
5856 | si->src_reg, off); | |
db58ba45 AS |
5857 | break; |
5858 | ||
d691f9e8 AS |
5859 | case offsetof(struct __sk_buff, tc_index): |
5860 | #ifdef CONFIG_NET_SCHED | |
d691f9e8 | 5861 | if (type == BPF_WRITE) |
6b8cc1d1 | 5862 | *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
5863 | bpf_target_off(struct sk_buff, tc_index, 2, |
5864 | target_size)); | |
d691f9e8 | 5865 | else |
6b8cc1d1 | 5866 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
f96da094 DB |
5867 | bpf_target_off(struct sk_buff, tc_index, 2, |
5868 | target_size)); | |
d691f9e8 | 5869 | #else |
2ed46ce4 | 5870 | *target_size = 2; |
d691f9e8 | 5871 | if (type == BPF_WRITE) |
6b8cc1d1 | 5872 | *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
d691f9e8 | 5873 | else |
6b8cc1d1 | 5874 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
b1d9fc41 DB |
5875 | #endif |
5876 | break; | |
5877 | ||
5878 | case offsetof(struct __sk_buff, napi_id): | |
5879 | #if defined(CONFIG_NET_RX_BUSY_POLL) | |
b1d9fc41 | 5880 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
f96da094 DB |
5881 | bpf_target_off(struct sk_buff, napi_id, 4, |
5882 | target_size)); | |
b1d9fc41 DB |
5883 | *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
5884 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); | |
5885 | #else | |
2ed46ce4 | 5886 | *target_size = 4; |
b1d9fc41 | 5887 | *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
d691f9e8 | 5888 | #endif |
6b8cc1d1 | 5889 | break; |
8a31db56 JF |
5890 | case offsetof(struct __sk_buff, family): |
5891 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
5892 | ||
5893 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5894 | si->dst_reg, si->src_reg, | |
5895 | offsetof(struct sk_buff, sk)); | |
5896 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
5897 | bpf_target_off(struct sock_common, | |
5898 | skc_family, | |
5899 | 2, target_size)); | |
5900 | break; | |
5901 | case offsetof(struct __sk_buff, remote_ip4): | |
5902 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
5903 | ||
5904 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5905 | si->dst_reg, si->src_reg, | |
5906 | offsetof(struct sk_buff, sk)); | |
5907 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
5908 | bpf_target_off(struct sock_common, | |
5909 | skc_daddr, | |
5910 | 4, target_size)); | |
5911 | break; | |
5912 | case offsetof(struct __sk_buff, local_ip4): | |
5913 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
5914 | skc_rcv_saddr) != 4); | |
5915 | ||
5916 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5917 | si->dst_reg, si->src_reg, | |
5918 | offsetof(struct sk_buff, sk)); | |
5919 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
5920 | bpf_target_off(struct sock_common, | |
5921 | skc_rcv_saddr, | |
5922 | 4, target_size)); | |
5923 | break; | |
5924 | case offsetof(struct __sk_buff, remote_ip6[0]) ... | |
5925 | offsetof(struct __sk_buff, remote_ip6[3]): | |
5926 | #if IS_ENABLED(CONFIG_IPV6) | |
5927 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
5928 | skc_v6_daddr.s6_addr32[0]) != 4); | |
5929 | ||
5930 | off = si->off; | |
5931 | off -= offsetof(struct __sk_buff, remote_ip6[0]); | |
5932 | ||
5933 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5934 | si->dst_reg, si->src_reg, | |
5935 | offsetof(struct sk_buff, sk)); | |
5936 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
5937 | offsetof(struct sock_common, | |
5938 | skc_v6_daddr.s6_addr32[0]) + | |
5939 | off); | |
5940 | #else | |
5941 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
5942 | #endif | |
5943 | break; | |
5944 | case offsetof(struct __sk_buff, local_ip6[0]) ... | |
5945 | offsetof(struct __sk_buff, local_ip6[3]): | |
5946 | #if IS_ENABLED(CONFIG_IPV6) | |
5947 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
5948 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
5949 | ||
5950 | off = si->off; | |
5951 | off -= offsetof(struct __sk_buff, local_ip6[0]); | |
5952 | ||
5953 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5954 | si->dst_reg, si->src_reg, | |
5955 | offsetof(struct sk_buff, sk)); | |
5956 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
5957 | offsetof(struct sock_common, | |
5958 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
5959 | off); | |
5960 | #else | |
5961 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
5962 | #endif | |
5963 | break; | |
5964 | ||
5965 | case offsetof(struct __sk_buff, remote_port): | |
5966 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
5967 | ||
5968 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5969 | si->dst_reg, si->src_reg, | |
5970 | offsetof(struct sk_buff, sk)); | |
5971 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
5972 | bpf_target_off(struct sock_common, | |
5973 | skc_dport, | |
5974 | 2, target_size)); | |
5975 | #ifndef __BIG_ENDIAN_BITFIELD | |
5976 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
5977 | #endif | |
5978 | break; | |
5979 | ||
5980 | case offsetof(struct __sk_buff, local_port): | |
5981 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
5982 | ||
5983 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), | |
5984 | si->dst_reg, si->src_reg, | |
5985 | offsetof(struct sk_buff, sk)); | |
5986 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
5987 | bpf_target_off(struct sock_common, | |
5988 | skc_num, 2, target_size)); | |
5989 | break; | |
9bac3d6d AS |
5990 | } |
5991 | ||
5992 | return insn - insn_buf; | |
89aa0758 AS |
5993 | } |
5994 | ||
61023658 | 5995 | static u32 sock_filter_convert_ctx_access(enum bpf_access_type type, |
6b8cc1d1 | 5996 | const struct bpf_insn *si, |
61023658 | 5997 | struct bpf_insn *insn_buf, |
f96da094 | 5998 | struct bpf_prog *prog, u32 *target_size) |
61023658 DA |
5999 | { |
6000 | struct bpf_insn *insn = insn_buf; | |
aac3fc32 | 6001 | int off; |
61023658 | 6002 | |
6b8cc1d1 | 6003 | switch (si->off) { |
61023658 DA |
6004 | case offsetof(struct bpf_sock, bound_dev_if): |
6005 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); | |
6006 | ||
6007 | if (type == BPF_WRITE) | |
6b8cc1d1 | 6008 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
6009 | offsetof(struct sock, sk_bound_dev_if)); |
6010 | else | |
6b8cc1d1 | 6011 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
61023658 DA |
6012 | offsetof(struct sock, sk_bound_dev_if)); |
6013 | break; | |
aa4c1037 | 6014 | |
482dca93 DA |
6015 | case offsetof(struct bpf_sock, mark): |
6016 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4); | |
6017 | ||
6018 | if (type == BPF_WRITE) | |
6019 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6020 | offsetof(struct sock, sk_mark)); | |
6021 | else | |
6022 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6023 | offsetof(struct sock, sk_mark)); | |
6024 | break; | |
6025 | ||
6026 | case offsetof(struct bpf_sock, priority): | |
6027 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4); | |
6028 | ||
6029 | if (type == BPF_WRITE) | |
6030 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6031 | offsetof(struct sock, sk_priority)); | |
6032 | else | |
6033 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6034 | offsetof(struct sock, sk_priority)); | |
6035 | break; | |
6036 | ||
aa4c1037 DA |
6037 | case offsetof(struct bpf_sock, family): |
6038 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2); | |
6039 | ||
6b8cc1d1 | 6040 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
aa4c1037 DA |
6041 | offsetof(struct sock, sk_family)); |
6042 | break; | |
6043 | ||
6044 | case offsetof(struct bpf_sock, type): | |
6b8cc1d1 | 6045 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 6046 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
6047 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); |
6048 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
aa4c1037 DA |
6049 | break; |
6050 | ||
6051 | case offsetof(struct bpf_sock, protocol): | |
6b8cc1d1 | 6052 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
aa4c1037 | 6053 | offsetof(struct sock, __sk_flags_offset)); |
6b8cc1d1 DB |
6054 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); |
6055 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); | |
aa4c1037 | 6056 | break; |
aac3fc32 AI |
6057 | |
6058 | case offsetof(struct bpf_sock, src_ip4): | |
6059 | *insn++ = BPF_LDX_MEM( | |
6060 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
6061 | bpf_target_off(struct sock_common, skc_rcv_saddr, | |
6062 | FIELD_SIZEOF(struct sock_common, | |
6063 | skc_rcv_saddr), | |
6064 | target_size)); | |
6065 | break; | |
6066 | ||
6067 | case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): | |
6068 | #if IS_ENABLED(CONFIG_IPV6) | |
6069 | off = si->off; | |
6070 | off -= offsetof(struct bpf_sock, src_ip6[0]); | |
6071 | *insn++ = BPF_LDX_MEM( | |
6072 | BPF_SIZE(si->code), si->dst_reg, si->src_reg, | |
6073 | bpf_target_off( | |
6074 | struct sock_common, | |
6075 | skc_v6_rcv_saddr.s6_addr32[0], | |
6076 | FIELD_SIZEOF(struct sock_common, | |
6077 | skc_v6_rcv_saddr.s6_addr32[0]), | |
6078 | target_size) + off); | |
6079 | #else | |
6080 | (void)off; | |
6081 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6082 | #endif | |
6083 | break; | |
6084 | ||
6085 | case offsetof(struct bpf_sock, src_port): | |
6086 | *insn++ = BPF_LDX_MEM( | |
6087 | BPF_FIELD_SIZEOF(struct sock_common, skc_num), | |
6088 | si->dst_reg, si->src_reg, | |
6089 | bpf_target_off(struct sock_common, skc_num, | |
6090 | FIELD_SIZEOF(struct sock_common, | |
6091 | skc_num), | |
6092 | target_size)); | |
6093 | break; | |
61023658 DA |
6094 | } |
6095 | ||
6096 | return insn - insn_buf; | |
6097 | } | |
6098 | ||
6b8cc1d1 DB |
6099 | static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
6100 | const struct bpf_insn *si, | |
374fb54e | 6101 | struct bpf_insn *insn_buf, |
f96da094 | 6102 | struct bpf_prog *prog, u32 *target_size) |
374fb54e DB |
6103 | { |
6104 | struct bpf_insn *insn = insn_buf; | |
6105 | ||
6b8cc1d1 | 6106 | switch (si->off) { |
374fb54e | 6107 | case offsetof(struct __sk_buff, ifindex): |
374fb54e | 6108 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
6b8cc1d1 | 6109 | si->dst_reg, si->src_reg, |
374fb54e | 6110 | offsetof(struct sk_buff, dev)); |
6b8cc1d1 | 6111 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
f96da094 DB |
6112 | bpf_target_off(struct net_device, ifindex, 4, |
6113 | target_size)); | |
374fb54e DB |
6114 | break; |
6115 | default: | |
f96da094 DB |
6116 | return bpf_convert_ctx_access(type, si, insn_buf, prog, |
6117 | target_size); | |
374fb54e DB |
6118 | } |
6119 | ||
6120 | return insn - insn_buf; | |
6121 | } | |
6122 | ||
6b8cc1d1 DB |
6123 | static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
6124 | const struct bpf_insn *si, | |
6a773a15 | 6125 | struct bpf_insn *insn_buf, |
f96da094 | 6126 | struct bpf_prog *prog, u32 *target_size) |
6a773a15 BB |
6127 | { |
6128 | struct bpf_insn *insn = insn_buf; | |
6129 | ||
6b8cc1d1 | 6130 | switch (si->off) { |
6a773a15 | 6131 | case offsetof(struct xdp_md, data): |
f035a515 | 6132 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
6b8cc1d1 | 6133 | si->dst_reg, si->src_reg, |
6a773a15 BB |
6134 | offsetof(struct xdp_buff, data)); |
6135 | break; | |
de8f3a83 DB |
6136 | case offsetof(struct xdp_md, data_meta): |
6137 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), | |
6138 | si->dst_reg, si->src_reg, | |
6139 | offsetof(struct xdp_buff, data_meta)); | |
6140 | break; | |
6a773a15 | 6141 | case offsetof(struct xdp_md, data_end): |
f035a515 | 6142 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
6b8cc1d1 | 6143 | si->dst_reg, si->src_reg, |
6a773a15 BB |
6144 | offsetof(struct xdp_buff, data_end)); |
6145 | break; | |
02dd3291 JDB |
6146 | case offsetof(struct xdp_md, ingress_ifindex): |
6147 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
6148 | si->dst_reg, si->src_reg, | |
6149 | offsetof(struct xdp_buff, rxq)); | |
6150 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), | |
6151 | si->dst_reg, si->dst_reg, | |
6152 | offsetof(struct xdp_rxq_info, dev)); | |
6153 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 | 6154 | offsetof(struct net_device, ifindex)); |
02dd3291 JDB |
6155 | break; |
6156 | case offsetof(struct xdp_md, rx_queue_index): | |
6157 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), | |
6158 | si->dst_reg, si->src_reg, | |
6159 | offsetof(struct xdp_buff, rxq)); | |
6160 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
daaf24c6 JDB |
6161 | offsetof(struct xdp_rxq_info, |
6162 | queue_index)); | |
02dd3291 | 6163 | break; |
6a773a15 BB |
6164 | } |
6165 | ||
6166 | return insn - insn_buf; | |
6167 | } | |
6168 | ||
4fbac77d AI |
6169 | /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of |
6170 | * context Structure, F is Field in context structure that contains a pointer | |
6171 | * to Nested Structure of type NS that has the field NF. | |
6172 | * | |
6173 | * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make | |
6174 | * sure that SIZE is not greater than actual size of S.F.NF. | |
6175 | * | |
6176 | * If offset OFF is provided, the load happens from that offset relative to | |
6177 | * offset of NF. | |
6178 | */ | |
6179 | #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ | |
6180 | do { \ | |
6181 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ | |
6182 | si->src_reg, offsetof(S, F)); \ | |
6183 | *insn++ = BPF_LDX_MEM( \ | |
6184 | SIZE, si->dst_reg, si->dst_reg, \ | |
6185 | bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ | |
6186 | target_size) \ | |
6187 | + OFF); \ | |
6188 | } while (0) | |
6189 | ||
6190 | #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ | |
6191 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ | |
6192 | BPF_FIELD_SIZEOF(NS, NF), 0) | |
6193 | ||
6194 | /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to | |
6195 | * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. | |
6196 | * | |
6197 | * It doesn't support SIZE argument though since narrow stores are not | |
6198 | * supported for now. | |
6199 | * | |
6200 | * In addition it uses Temporary Field TF (member of struct S) as the 3rd | |
6201 | * "register" since two registers available in convert_ctx_access are not | |
6202 | * enough: we can't override neither SRC, since it contains value to store, nor | |
6203 | * DST since it contains pointer to context that may be used by later | |
6204 | * instructions. But we need a temporary place to save pointer to nested | |
6205 | * structure whose field we want to store to. | |
6206 | */ | |
6207 | #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, TF) \ | |
6208 | do { \ | |
6209 | int tmp_reg = BPF_REG_9; \ | |
6210 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
6211 | --tmp_reg; \ | |
6212 | if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ | |
6213 | --tmp_reg; \ | |
6214 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ | |
6215 | offsetof(S, TF)); \ | |
6216 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ | |
6217 | si->dst_reg, offsetof(S, F)); \ | |
6218 | *insn++ = BPF_STX_MEM( \ | |
6219 | BPF_FIELD_SIZEOF(NS, NF), tmp_reg, si->src_reg, \ | |
6220 | bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ | |
6221 | target_size) \ | |
6222 | + OFF); \ | |
6223 | *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ | |
6224 | offsetof(S, TF)); \ | |
6225 | } while (0) | |
6226 | ||
6227 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ | |
6228 | TF) \ | |
6229 | do { \ | |
6230 | if (type == BPF_WRITE) { \ | |
6231 | SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, \ | |
6232 | TF); \ | |
6233 | } else { \ | |
6234 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ | |
6235 | S, NS, F, NF, SIZE, OFF); \ | |
6236 | } \ | |
6237 | } while (0) | |
6238 | ||
6239 | #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ | |
6240 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ | |
6241 | S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) | |
6242 | ||
6243 | static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, | |
6244 | const struct bpf_insn *si, | |
6245 | struct bpf_insn *insn_buf, | |
6246 | struct bpf_prog *prog, u32 *target_size) | |
6247 | { | |
6248 | struct bpf_insn *insn = insn_buf; | |
6249 | int off; | |
6250 | ||
6251 | switch (si->off) { | |
6252 | case offsetof(struct bpf_sock_addr, user_family): | |
6253 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
6254 | struct sockaddr, uaddr, sa_family); | |
6255 | break; | |
6256 | ||
6257 | case offsetof(struct bpf_sock_addr, user_ip4): | |
6258 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6259 | struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, | |
6260 | sin_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
6261 | break; | |
6262 | ||
6263 | case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): | |
6264 | off = si->off; | |
6265 | off -= offsetof(struct bpf_sock_addr, user_ip6[0]); | |
6266 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6267 | struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, | |
6268 | sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, | |
6269 | tmp_reg); | |
6270 | break; | |
6271 | ||
6272 | case offsetof(struct bpf_sock_addr, user_port): | |
6273 | /* To get port we need to know sa_family first and then treat | |
6274 | * sockaddr as either sockaddr_in or sockaddr_in6. | |
6275 | * Though we can simplify since port field has same offset and | |
6276 | * size in both structures. | |
6277 | * Here we check this invariant and use just one of the | |
6278 | * structures if it's true. | |
6279 | */ | |
6280 | BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != | |
6281 | offsetof(struct sockaddr_in6, sin6_port)); | |
6282 | BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) != | |
6283 | FIELD_SIZEOF(struct sockaddr_in6, sin6_port)); | |
6284 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, | |
6285 | struct sockaddr_in6, uaddr, | |
6286 | sin6_port, tmp_reg); | |
6287 | break; | |
6288 | ||
6289 | case offsetof(struct bpf_sock_addr, family): | |
6290 | SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, | |
6291 | struct sock, sk, sk_family); | |
6292 | break; | |
6293 | ||
6294 | case offsetof(struct bpf_sock_addr, type): | |
6295 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( | |
6296 | struct bpf_sock_addr_kern, struct sock, sk, | |
6297 | __sk_flags_offset, BPF_W, 0); | |
6298 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); | |
6299 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); | |
6300 | break; | |
6301 | ||
6302 | case offsetof(struct bpf_sock_addr, protocol): | |
6303 | SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( | |
6304 | struct bpf_sock_addr_kern, struct sock, sk, | |
6305 | __sk_flags_offset, BPF_W, 0); | |
6306 | *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); | |
6307 | *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, | |
6308 | SK_FL_PROTO_SHIFT); | |
6309 | break; | |
1cedee13 AI |
6310 | |
6311 | case offsetof(struct bpf_sock_addr, msg_src_ip4): | |
6312 | /* Treat t_ctx as struct in_addr for msg_src_ip4. */ | |
6313 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6314 | struct bpf_sock_addr_kern, struct in_addr, t_ctx, | |
6315 | s_addr, BPF_SIZE(si->code), 0, tmp_reg); | |
6316 | break; | |
6317 | ||
6318 | case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], | |
6319 | msg_src_ip6[3]): | |
6320 | off = si->off; | |
6321 | off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); | |
6322 | /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ | |
6323 | SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( | |
6324 | struct bpf_sock_addr_kern, struct in6_addr, t_ctx, | |
6325 | s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); | |
6326 | break; | |
4fbac77d AI |
6327 | } |
6328 | ||
6329 | return insn - insn_buf; | |
6330 | } | |
6331 | ||
40304b2a LB |
6332 | static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
6333 | const struct bpf_insn *si, | |
6334 | struct bpf_insn *insn_buf, | |
f96da094 DB |
6335 | struct bpf_prog *prog, |
6336 | u32 *target_size) | |
40304b2a LB |
6337 | { |
6338 | struct bpf_insn *insn = insn_buf; | |
6339 | int off; | |
6340 | ||
6341 | switch (si->off) { | |
6342 | case offsetof(struct bpf_sock_ops, op) ... | |
6343 | offsetof(struct bpf_sock_ops, replylong[3]): | |
6344 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != | |
6345 | FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); | |
6346 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != | |
6347 | FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); | |
6348 | BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != | |
6349 | FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); | |
6350 | off = si->off; | |
6351 | off -= offsetof(struct bpf_sock_ops, op); | |
6352 | off += offsetof(struct bpf_sock_ops_kern, op); | |
6353 | if (type == BPF_WRITE) | |
6354 | *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6355 | off); | |
6356 | else | |
6357 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, | |
6358 | off); | |
6359 | break; | |
6360 | ||
6361 | case offsetof(struct bpf_sock_ops, family): | |
6362 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
6363 | ||
6364 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6365 | struct bpf_sock_ops_kern, sk), | |
6366 | si->dst_reg, si->src_reg, | |
6367 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6368 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6369 | offsetof(struct sock_common, skc_family)); | |
6370 | break; | |
6371 | ||
6372 | case offsetof(struct bpf_sock_ops, remote_ip4): | |
6373 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
6374 | ||
6375 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6376 | struct bpf_sock_ops_kern, sk), | |
6377 | si->dst_reg, si->src_reg, | |
6378 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6379 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6380 | offsetof(struct sock_common, skc_daddr)); | |
6381 | break; | |
6382 | ||
6383 | case offsetof(struct bpf_sock_ops, local_ip4): | |
303def35 JF |
6384 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, |
6385 | skc_rcv_saddr) != 4); | |
40304b2a LB |
6386 | |
6387 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6388 | struct bpf_sock_ops_kern, sk), | |
6389 | si->dst_reg, si->src_reg, | |
6390 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6391 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6392 | offsetof(struct sock_common, | |
6393 | skc_rcv_saddr)); | |
6394 | break; | |
6395 | ||
6396 | case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... | |
6397 | offsetof(struct bpf_sock_ops, remote_ip6[3]): | |
6398 | #if IS_ENABLED(CONFIG_IPV6) | |
6399 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6400 | skc_v6_daddr.s6_addr32[0]) != 4); | |
6401 | ||
6402 | off = si->off; | |
6403 | off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); | |
6404 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6405 | struct bpf_sock_ops_kern, sk), | |
6406 | si->dst_reg, si->src_reg, | |
6407 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6408 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6409 | offsetof(struct sock_common, | |
6410 | skc_v6_daddr.s6_addr32[0]) + | |
6411 | off); | |
6412 | #else | |
6413 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6414 | #endif | |
6415 | break; | |
6416 | ||
6417 | case offsetof(struct bpf_sock_ops, local_ip6[0]) ... | |
6418 | offsetof(struct bpf_sock_ops, local_ip6[3]): | |
6419 | #if IS_ENABLED(CONFIG_IPV6) | |
6420 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6421 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
6422 | ||
6423 | off = si->off; | |
6424 | off -= offsetof(struct bpf_sock_ops, local_ip6[0]); | |
6425 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6426 | struct bpf_sock_ops_kern, sk), | |
6427 | si->dst_reg, si->src_reg, | |
6428 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6429 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6430 | offsetof(struct sock_common, | |
6431 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
6432 | off); | |
6433 | #else | |
6434 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6435 | #endif | |
6436 | break; | |
6437 | ||
6438 | case offsetof(struct bpf_sock_ops, remote_port): | |
6439 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
6440 | ||
6441 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6442 | struct bpf_sock_ops_kern, sk), | |
6443 | si->dst_reg, si->src_reg, | |
6444 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6445 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6446 | offsetof(struct sock_common, skc_dport)); | |
6447 | #ifndef __BIG_ENDIAN_BITFIELD | |
6448 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
6449 | #endif | |
6450 | break; | |
6451 | ||
6452 | case offsetof(struct bpf_sock_ops, local_port): | |
6453 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
6454 | ||
6455 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6456 | struct bpf_sock_ops_kern, sk), | |
6457 | si->dst_reg, si->src_reg, | |
6458 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6459 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6460 | offsetof(struct sock_common, skc_num)); | |
6461 | break; | |
f19397a5 LB |
6462 | |
6463 | case offsetof(struct bpf_sock_ops, is_fullsock): | |
6464 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6465 | struct bpf_sock_ops_kern, | |
6466 | is_fullsock), | |
6467 | si->dst_reg, si->src_reg, | |
6468 | offsetof(struct bpf_sock_ops_kern, | |
6469 | is_fullsock)); | |
6470 | break; | |
6471 | ||
44f0e430 LB |
6472 | case offsetof(struct bpf_sock_ops, state): |
6473 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1); | |
6474 | ||
6475 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6476 | struct bpf_sock_ops_kern, sk), | |
6477 | si->dst_reg, si->src_reg, | |
6478 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6479 | *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, | |
6480 | offsetof(struct sock_common, skc_state)); | |
6481 | break; | |
6482 | ||
6483 | case offsetof(struct bpf_sock_ops, rtt_min): | |
6484 | BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != | |
6485 | sizeof(struct minmax)); | |
6486 | BUILD_BUG_ON(sizeof(struct minmax) < | |
6487 | sizeof(struct minmax_sample)); | |
6488 | ||
6489 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6490 | struct bpf_sock_ops_kern, sk), | |
6491 | si->dst_reg, si->src_reg, | |
6492 | offsetof(struct bpf_sock_ops_kern, sk)); | |
6493 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6494 | offsetof(struct tcp_sock, rtt_min) + | |
6495 | FIELD_SIZEOF(struct minmax_sample, t)); | |
6496 | break; | |
6497 | ||
34d367c5 LB |
6498 | /* Helper macro for adding read access to tcp_sock or sock fields. */ |
6499 | #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
f19397a5 | 6500 | do { \ |
34d367c5 LB |
6501 | BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ |
6502 | FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ | |
f19397a5 LB |
6503 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
6504 | struct bpf_sock_ops_kern, \ | |
6505 | is_fullsock), \ | |
6506 | si->dst_reg, si->src_reg, \ | |
6507 | offsetof(struct bpf_sock_ops_kern, \ | |
6508 | is_fullsock)); \ | |
6509 | *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ | |
6510 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
6511 | struct bpf_sock_ops_kern, sk),\ | |
6512 | si->dst_reg, si->src_reg, \ | |
6513 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
34d367c5 LB |
6514 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ |
6515 | OBJ_FIELD), \ | |
6516 | si->dst_reg, si->dst_reg, \ | |
6517 | offsetof(OBJ, OBJ_FIELD)); \ | |
f19397a5 LB |
6518 | } while (0) |
6519 | ||
b73042b8 LB |
6520 | /* Helper macro for adding write access to tcp_sock or sock fields. |
6521 | * The macro is called with two registers, dst_reg which contains a pointer | |
6522 | * to ctx (context) and src_reg which contains the value that should be | |
6523 | * stored. However, we need an additional register since we cannot overwrite | |
6524 | * dst_reg because it may be used later in the program. | |
6525 | * Instead we "borrow" one of the other register. We first save its value | |
6526 | * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore | |
6527 | * it at the end of the macro. | |
6528 | */ | |
6529 | #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ | |
6530 | do { \ | |
6531 | int reg = BPF_REG_9; \ | |
6532 | BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ | |
6533 | FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ | |
6534 | if (si->dst_reg == reg || si->src_reg == reg) \ | |
6535 | reg--; \ | |
6536 | if (si->dst_reg == reg || si->src_reg == reg) \ | |
6537 | reg--; \ | |
6538 | *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ | |
6539 | offsetof(struct bpf_sock_ops_kern, \ | |
6540 | temp)); \ | |
6541 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
6542 | struct bpf_sock_ops_kern, \ | |
6543 | is_fullsock), \ | |
6544 | reg, si->dst_reg, \ | |
6545 | offsetof(struct bpf_sock_ops_kern, \ | |
6546 | is_fullsock)); \ | |
6547 | *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ | |
6548 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ | |
6549 | struct bpf_sock_ops_kern, sk),\ | |
6550 | reg, si->dst_reg, \ | |
6551 | offsetof(struct bpf_sock_ops_kern, sk));\ | |
6552 | *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ | |
6553 | reg, si->src_reg, \ | |
6554 | offsetof(OBJ, OBJ_FIELD)); \ | |
6555 | *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ | |
6556 | offsetof(struct bpf_sock_ops_kern, \ | |
6557 | temp)); \ | |
6558 | } while (0) | |
6559 | ||
6560 | #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ | |
6561 | do { \ | |
6562 | if (TYPE == BPF_WRITE) \ | |
6563 | SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
6564 | else \ | |
6565 | SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ | |
6566 | } while (0) | |
6567 | ||
f19397a5 | 6568 | case offsetof(struct bpf_sock_ops, snd_cwnd): |
34d367c5 | 6569 | SOCK_OPS_GET_FIELD(snd_cwnd, snd_cwnd, struct tcp_sock); |
f19397a5 LB |
6570 | break; |
6571 | ||
6572 | case offsetof(struct bpf_sock_ops, srtt_us): | |
34d367c5 | 6573 | SOCK_OPS_GET_FIELD(srtt_us, srtt_us, struct tcp_sock); |
f19397a5 | 6574 | break; |
b13d8807 LB |
6575 | |
6576 | case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): | |
6577 | SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, | |
6578 | struct tcp_sock); | |
6579 | break; | |
44f0e430 LB |
6580 | |
6581 | case offsetof(struct bpf_sock_ops, snd_ssthresh): | |
6582 | SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock); | |
6583 | break; | |
6584 | ||
6585 | case offsetof(struct bpf_sock_ops, rcv_nxt): | |
6586 | SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock); | |
6587 | break; | |
6588 | ||
6589 | case offsetof(struct bpf_sock_ops, snd_nxt): | |
6590 | SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock); | |
6591 | break; | |
6592 | ||
6593 | case offsetof(struct bpf_sock_ops, snd_una): | |
6594 | SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock); | |
6595 | break; | |
6596 | ||
6597 | case offsetof(struct bpf_sock_ops, mss_cache): | |
6598 | SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock); | |
6599 | break; | |
6600 | ||
6601 | case offsetof(struct bpf_sock_ops, ecn_flags): | |
6602 | SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock); | |
6603 | break; | |
6604 | ||
6605 | case offsetof(struct bpf_sock_ops, rate_delivered): | |
6606 | SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered, | |
6607 | struct tcp_sock); | |
6608 | break; | |
6609 | ||
6610 | case offsetof(struct bpf_sock_ops, rate_interval_us): | |
6611 | SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us, | |
6612 | struct tcp_sock); | |
6613 | break; | |
6614 | ||
6615 | case offsetof(struct bpf_sock_ops, packets_out): | |
6616 | SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock); | |
6617 | break; | |
6618 | ||
6619 | case offsetof(struct bpf_sock_ops, retrans_out): | |
6620 | SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock); | |
6621 | break; | |
6622 | ||
6623 | case offsetof(struct bpf_sock_ops, total_retrans): | |
6624 | SOCK_OPS_GET_FIELD(total_retrans, total_retrans, | |
6625 | struct tcp_sock); | |
6626 | break; | |
6627 | ||
6628 | case offsetof(struct bpf_sock_ops, segs_in): | |
6629 | SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock); | |
6630 | break; | |
6631 | ||
6632 | case offsetof(struct bpf_sock_ops, data_segs_in): | |
6633 | SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock); | |
6634 | break; | |
6635 | ||
6636 | case offsetof(struct bpf_sock_ops, segs_out): | |
6637 | SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock); | |
6638 | break; | |
6639 | ||
6640 | case offsetof(struct bpf_sock_ops, data_segs_out): | |
6641 | SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out, | |
6642 | struct tcp_sock); | |
6643 | break; | |
6644 | ||
6645 | case offsetof(struct bpf_sock_ops, lost_out): | |
6646 | SOCK_OPS_GET_FIELD(lost_out, lost_out, struct tcp_sock); | |
6647 | break; | |
6648 | ||
6649 | case offsetof(struct bpf_sock_ops, sacked_out): | |
6650 | SOCK_OPS_GET_FIELD(sacked_out, sacked_out, struct tcp_sock); | |
6651 | break; | |
6652 | ||
6653 | case offsetof(struct bpf_sock_ops, sk_txhash): | |
6f9bd3d7 LB |
6654 | SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, |
6655 | struct sock, type); | |
44f0e430 LB |
6656 | break; |
6657 | ||
6658 | case offsetof(struct bpf_sock_ops, bytes_received): | |
6659 | SOCK_OPS_GET_FIELD(bytes_received, bytes_received, | |
6660 | struct tcp_sock); | |
6661 | break; | |
6662 | ||
6663 | case offsetof(struct bpf_sock_ops, bytes_acked): | |
6664 | SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock); | |
6665 | break; | |
6f9bd3d7 | 6666 | |
40304b2a LB |
6667 | } |
6668 | return insn - insn_buf; | |
6669 | } | |
6670 | ||
8108a775 JF |
6671 | static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, |
6672 | const struct bpf_insn *si, | |
6673 | struct bpf_insn *insn_buf, | |
6674 | struct bpf_prog *prog, u32 *target_size) | |
6675 | { | |
6676 | struct bpf_insn *insn = insn_buf; | |
6677 | int off; | |
6678 | ||
6679 | switch (si->off) { | |
6680 | case offsetof(struct __sk_buff, data_end): | |
6681 | off = si->off; | |
6682 | off -= offsetof(struct __sk_buff, data_end); | |
6683 | off += offsetof(struct sk_buff, cb); | |
6684 | off += offsetof(struct tcp_skb_cb, bpf.data_end); | |
6685 | *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, | |
6686 | si->src_reg, off); | |
6687 | break; | |
6688 | default: | |
6689 | return bpf_convert_ctx_access(type, si, insn_buf, prog, | |
6690 | target_size); | |
6691 | } | |
6692 | ||
6693 | return insn - insn_buf; | |
6694 | } | |
6695 | ||
4f738adb JF |
6696 | static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, |
6697 | const struct bpf_insn *si, | |
6698 | struct bpf_insn *insn_buf, | |
6699 | struct bpf_prog *prog, u32 *target_size) | |
6700 | { | |
6701 | struct bpf_insn *insn = insn_buf; | |
720e7f38 | 6702 | #if IS_ENABLED(CONFIG_IPV6) |
303def35 | 6703 | int off; |
720e7f38 | 6704 | #endif |
4f738adb JF |
6705 | |
6706 | switch (si->off) { | |
6707 | case offsetof(struct sk_msg_md, data): | |
6708 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_buff, data), | |
6709 | si->dst_reg, si->src_reg, | |
6710 | offsetof(struct sk_msg_buff, data)); | |
6711 | break; | |
6712 | case offsetof(struct sk_msg_md, data_end): | |
6713 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_buff, data_end), | |
6714 | si->dst_reg, si->src_reg, | |
6715 | offsetof(struct sk_msg_buff, data_end)); | |
6716 | break; | |
303def35 JF |
6717 | case offsetof(struct sk_msg_md, family): |
6718 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); | |
6719 | ||
6720 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6721 | struct sk_msg_buff, sk), | |
6722 | si->dst_reg, si->src_reg, | |
6723 | offsetof(struct sk_msg_buff, sk)); | |
6724 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6725 | offsetof(struct sock_common, skc_family)); | |
6726 | break; | |
6727 | ||
6728 | case offsetof(struct sk_msg_md, remote_ip4): | |
6729 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); | |
6730 | ||
6731 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6732 | struct sk_msg_buff, sk), | |
6733 | si->dst_reg, si->src_reg, | |
6734 | offsetof(struct sk_msg_buff, sk)); | |
6735 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6736 | offsetof(struct sock_common, skc_daddr)); | |
6737 | break; | |
6738 | ||
6739 | case offsetof(struct sk_msg_md, local_ip4): | |
6740 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6741 | skc_rcv_saddr) != 4); | |
6742 | ||
6743 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6744 | struct sk_msg_buff, sk), | |
6745 | si->dst_reg, si->src_reg, | |
6746 | offsetof(struct sk_msg_buff, sk)); | |
6747 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6748 | offsetof(struct sock_common, | |
6749 | skc_rcv_saddr)); | |
6750 | break; | |
6751 | ||
6752 | case offsetof(struct sk_msg_md, remote_ip6[0]) ... | |
6753 | offsetof(struct sk_msg_md, remote_ip6[3]): | |
6754 | #if IS_ENABLED(CONFIG_IPV6) | |
6755 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6756 | skc_v6_daddr.s6_addr32[0]) != 4); | |
6757 | ||
6758 | off = si->off; | |
6759 | off -= offsetof(struct sk_msg_md, remote_ip6[0]); | |
6760 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6761 | struct sk_msg_buff, sk), | |
6762 | si->dst_reg, si->src_reg, | |
6763 | offsetof(struct sk_msg_buff, sk)); | |
6764 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6765 | offsetof(struct sock_common, | |
6766 | skc_v6_daddr.s6_addr32[0]) + | |
6767 | off); | |
6768 | #else | |
6769 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6770 | #endif | |
6771 | break; | |
6772 | ||
6773 | case offsetof(struct sk_msg_md, local_ip6[0]) ... | |
6774 | offsetof(struct sk_msg_md, local_ip6[3]): | |
6775 | #if IS_ENABLED(CONFIG_IPV6) | |
6776 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, | |
6777 | skc_v6_rcv_saddr.s6_addr32[0]) != 4); | |
6778 | ||
6779 | off = si->off; | |
6780 | off -= offsetof(struct sk_msg_md, local_ip6[0]); | |
6781 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6782 | struct sk_msg_buff, sk), | |
6783 | si->dst_reg, si->src_reg, | |
6784 | offsetof(struct sk_msg_buff, sk)); | |
6785 | *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, | |
6786 | offsetof(struct sock_common, | |
6787 | skc_v6_rcv_saddr.s6_addr32[0]) + | |
6788 | off); | |
6789 | #else | |
6790 | *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); | |
6791 | #endif | |
6792 | break; | |
6793 | ||
6794 | case offsetof(struct sk_msg_md, remote_port): | |
6795 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); | |
6796 | ||
6797 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6798 | struct sk_msg_buff, sk), | |
6799 | si->dst_reg, si->src_reg, | |
6800 | offsetof(struct sk_msg_buff, sk)); | |
6801 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6802 | offsetof(struct sock_common, skc_dport)); | |
6803 | #ifndef __BIG_ENDIAN_BITFIELD | |
6804 | *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); | |
6805 | #endif | |
6806 | break; | |
6807 | ||
6808 | case offsetof(struct sk_msg_md, local_port): | |
6809 | BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); | |
6810 | ||
6811 | *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( | |
6812 | struct sk_msg_buff, sk), | |
6813 | si->dst_reg, si->src_reg, | |
6814 | offsetof(struct sk_msg_buff, sk)); | |
6815 | *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, | |
6816 | offsetof(struct sock_common, skc_num)); | |
6817 | break; | |
4f738adb JF |
6818 | } |
6819 | ||
6820 | return insn - insn_buf; | |
6821 | } | |
6822 | ||
7de16e3a | 6823 | const struct bpf_verifier_ops sk_filter_verifier_ops = { |
4936e352 DB |
6824 | .get_func_proto = sk_filter_func_proto, |
6825 | .is_valid_access = sk_filter_is_valid_access, | |
2492d3b8 | 6826 | .convert_ctx_access = bpf_convert_ctx_access, |
e0cea7ce | 6827 | .gen_ld_abs = bpf_gen_ld_abs, |
89aa0758 AS |
6828 | }; |
6829 | ||
7de16e3a | 6830 | const struct bpf_prog_ops sk_filter_prog_ops = { |
61f3c964 | 6831 | .test_run = bpf_prog_test_run_skb, |
7de16e3a JK |
6832 | }; |
6833 | ||
6834 | const struct bpf_verifier_ops tc_cls_act_verifier_ops = { | |
4936e352 DB |
6835 | .get_func_proto = tc_cls_act_func_proto, |
6836 | .is_valid_access = tc_cls_act_is_valid_access, | |
374fb54e | 6837 | .convert_ctx_access = tc_cls_act_convert_ctx_access, |
36bbef52 | 6838 | .gen_prologue = tc_cls_act_prologue, |
e0cea7ce | 6839 | .gen_ld_abs = bpf_gen_ld_abs, |
7de16e3a JK |
6840 | }; |
6841 | ||
6842 | const struct bpf_prog_ops tc_cls_act_prog_ops = { | |
1cf1cae9 | 6843 | .test_run = bpf_prog_test_run_skb, |
608cd71a AS |
6844 | }; |
6845 | ||
7de16e3a | 6846 | const struct bpf_verifier_ops xdp_verifier_ops = { |
6a773a15 BB |
6847 | .get_func_proto = xdp_func_proto, |
6848 | .is_valid_access = xdp_is_valid_access, | |
6849 | .convert_ctx_access = xdp_convert_ctx_access, | |
7de16e3a JK |
6850 | }; |
6851 | ||
6852 | const struct bpf_prog_ops xdp_prog_ops = { | |
1cf1cae9 | 6853 | .test_run = bpf_prog_test_run_xdp, |
6a773a15 BB |
6854 | }; |
6855 | ||
7de16e3a | 6856 | const struct bpf_verifier_ops cg_skb_verifier_ops = { |
cd339431 | 6857 | .get_func_proto = cg_skb_func_proto, |
0e33661d | 6858 | .is_valid_access = sk_filter_is_valid_access, |
2492d3b8 | 6859 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
6860 | }; |
6861 | ||
6862 | const struct bpf_prog_ops cg_skb_prog_ops = { | |
1cf1cae9 | 6863 | .test_run = bpf_prog_test_run_skb, |
0e33661d DM |
6864 | }; |
6865 | ||
cd3092c7 MX |
6866 | const struct bpf_verifier_ops lwt_in_verifier_ops = { |
6867 | .get_func_proto = lwt_in_func_proto, | |
3a0af8fd | 6868 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 6869 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
6870 | }; |
6871 | ||
cd3092c7 MX |
6872 | const struct bpf_prog_ops lwt_in_prog_ops = { |
6873 | .test_run = bpf_prog_test_run_skb, | |
6874 | }; | |
6875 | ||
6876 | const struct bpf_verifier_ops lwt_out_verifier_ops = { | |
6877 | .get_func_proto = lwt_out_func_proto, | |
3a0af8fd | 6878 | .is_valid_access = lwt_is_valid_access, |
2492d3b8 | 6879 | .convert_ctx_access = bpf_convert_ctx_access, |
7de16e3a JK |
6880 | }; |
6881 | ||
cd3092c7 | 6882 | const struct bpf_prog_ops lwt_out_prog_ops = { |
1cf1cae9 | 6883 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
6884 | }; |
6885 | ||
7de16e3a | 6886 | const struct bpf_verifier_ops lwt_xmit_verifier_ops = { |
3a0af8fd TG |
6887 | .get_func_proto = lwt_xmit_func_proto, |
6888 | .is_valid_access = lwt_is_valid_access, | |
2492d3b8 | 6889 | .convert_ctx_access = bpf_convert_ctx_access, |
3a0af8fd | 6890 | .gen_prologue = tc_cls_act_prologue, |
7de16e3a JK |
6891 | }; |
6892 | ||
6893 | const struct bpf_prog_ops lwt_xmit_prog_ops = { | |
1cf1cae9 | 6894 | .test_run = bpf_prog_test_run_skb, |
3a0af8fd TG |
6895 | }; |
6896 | ||
004d4b27 MX |
6897 | const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { |
6898 | .get_func_proto = lwt_seg6local_func_proto, | |
6899 | .is_valid_access = lwt_is_valid_access, | |
6900 | .convert_ctx_access = bpf_convert_ctx_access, | |
6901 | }; | |
6902 | ||
6903 | const struct bpf_prog_ops lwt_seg6local_prog_ops = { | |
6904 | .test_run = bpf_prog_test_run_skb, | |
6905 | }; | |
6906 | ||
7de16e3a | 6907 | const struct bpf_verifier_ops cg_sock_verifier_ops = { |
ae2cf1c4 | 6908 | .get_func_proto = sock_filter_func_proto, |
61023658 DA |
6909 | .is_valid_access = sock_filter_is_valid_access, |
6910 | .convert_ctx_access = sock_filter_convert_ctx_access, | |
6911 | }; | |
6912 | ||
7de16e3a JK |
6913 | const struct bpf_prog_ops cg_sock_prog_ops = { |
6914 | }; | |
6915 | ||
4fbac77d AI |
6916 | const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { |
6917 | .get_func_proto = sock_addr_func_proto, | |
6918 | .is_valid_access = sock_addr_is_valid_access, | |
6919 | .convert_ctx_access = sock_addr_convert_ctx_access, | |
6920 | }; | |
6921 | ||
6922 | const struct bpf_prog_ops cg_sock_addr_prog_ops = { | |
6923 | }; | |
6924 | ||
7de16e3a | 6925 | const struct bpf_verifier_ops sock_ops_verifier_ops = { |
8c4b4c7e | 6926 | .get_func_proto = sock_ops_func_proto, |
40304b2a LB |
6927 | .is_valid_access = sock_ops_is_valid_access, |
6928 | .convert_ctx_access = sock_ops_convert_ctx_access, | |
6929 | }; | |
6930 | ||
7de16e3a JK |
6931 | const struct bpf_prog_ops sock_ops_prog_ops = { |
6932 | }; | |
6933 | ||
6934 | const struct bpf_verifier_ops sk_skb_verifier_ops = { | |
b005fd18 JF |
6935 | .get_func_proto = sk_skb_func_proto, |
6936 | .is_valid_access = sk_skb_is_valid_access, | |
8108a775 | 6937 | .convert_ctx_access = sk_skb_convert_ctx_access, |
8a31db56 | 6938 | .gen_prologue = sk_skb_prologue, |
b005fd18 JF |
6939 | }; |
6940 | ||
7de16e3a JK |
6941 | const struct bpf_prog_ops sk_skb_prog_ops = { |
6942 | }; | |
6943 | ||
4f738adb JF |
6944 | const struct bpf_verifier_ops sk_msg_verifier_ops = { |
6945 | .get_func_proto = sk_msg_func_proto, | |
6946 | .is_valid_access = sk_msg_is_valid_access, | |
6947 | .convert_ctx_access = sk_msg_convert_ctx_access, | |
6948 | }; | |
6949 | ||
6950 | const struct bpf_prog_ops sk_msg_prog_ops = { | |
6951 | }; | |
6952 | ||
8ced425e | 6953 | int sk_detach_filter(struct sock *sk) |
55b33325 PE |
6954 | { |
6955 | int ret = -ENOENT; | |
6956 | struct sk_filter *filter; | |
6957 | ||
d59577b6 VB |
6958 | if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
6959 | return -EPERM; | |
6960 | ||
8ced425e HFS |
6961 | filter = rcu_dereference_protected(sk->sk_filter, |
6962 | lockdep_sock_is_held(sk)); | |
55b33325 | 6963 | if (filter) { |
a9b3cd7f | 6964 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
46bcf14f | 6965 | sk_filter_uncharge(sk, filter); |
55b33325 PE |
6966 | ret = 0; |
6967 | } | |
a3ea269b | 6968 | |
55b33325 PE |
6969 | return ret; |
6970 | } | |
8ced425e | 6971 | EXPORT_SYMBOL_GPL(sk_detach_filter); |
a8fc9277 | 6972 | |
a3ea269b DB |
6973 | int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
6974 | unsigned int len) | |
a8fc9277 | 6975 | { |
a3ea269b | 6976 | struct sock_fprog_kern *fprog; |
a8fc9277 | 6977 | struct sk_filter *filter; |
a3ea269b | 6978 | int ret = 0; |
a8fc9277 PE |
6979 | |
6980 | lock_sock(sk); | |
6981 | filter = rcu_dereference_protected(sk->sk_filter, | |
8ced425e | 6982 | lockdep_sock_is_held(sk)); |
a8fc9277 PE |
6983 | if (!filter) |
6984 | goto out; | |
a3ea269b DB |
6985 | |
6986 | /* We're copying the filter that has been originally attached, | |
93d08b69 DB |
6987 | * so no conversion/decode needed anymore. eBPF programs that |
6988 | * have no original program cannot be dumped through this. | |
a3ea269b | 6989 | */ |
93d08b69 | 6990 | ret = -EACCES; |
7ae457c1 | 6991 | fprog = filter->prog->orig_prog; |
93d08b69 DB |
6992 | if (!fprog) |
6993 | goto out; | |
a3ea269b DB |
6994 | |
6995 | ret = fprog->len; | |
a8fc9277 | 6996 | if (!len) |
a3ea269b | 6997 | /* User space only enquires number of filter blocks. */ |
a8fc9277 | 6998 | goto out; |
a3ea269b | 6999 | |
a8fc9277 | 7000 | ret = -EINVAL; |
a3ea269b | 7001 | if (len < fprog->len) |
a8fc9277 PE |
7002 | goto out; |
7003 | ||
7004 | ret = -EFAULT; | |
009937e7 | 7005 | if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
a3ea269b | 7006 | goto out; |
a8fc9277 | 7007 | |
a3ea269b DB |
7008 | /* Instead of bytes, the API requests to return the number |
7009 | * of filter blocks. | |
7010 | */ | |
7011 | ret = fprog->len; | |
a8fc9277 PE |
7012 | out: |
7013 | release_sock(sk); | |
7014 | return ret; | |
7015 | } |