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bpf, sockmap: fix psock refcount leak in bpf_tcp_recvmsg
[thirdparty/linux.git] / net / core / filter.c
CommitLineData
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 85int 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 122EXPORT_SYMBOL(sk_filter_trim_cap);
43db6d65 123
b390134c 124BPF_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 129BPF_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 149BPF_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		 173BPF_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
193BPF_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
200BPF_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
220BPF_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
227BPF_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
247BPF_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 254BPF_CALL_0(bpf_get_raw_cpu_id)
bd4cf0ed
AS		 255{
256 return raw_smp_processor_id();
257}
258
80b48c44 259static 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		 265static 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 316static 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		 446static 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 534static 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
558do_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 739jmp_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		 874err:
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 886static 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 }
934error:
935 kfree(masks);
936 return ret;
937}
938
34805931
DB		 939static 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		 1005static 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		 1030static 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		 1108static 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 1131static 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		 1141static 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		 1151static 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 1161static 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 */
1174static 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
1180void 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 1191static 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		 1204bool 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 1216static 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
1280out_err_free:
1281 kfree(old_prog);
1282out_err:
7ae457c1 1283 __bpf_prog_release(fp);
bd4cf0ed
AS		 1284 return ERR_PTR(err);
1285}
1286
ac67eb2c
DB		 1287static 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 1336int 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 1368EXPORT_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 */
1381int 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 1422EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
ac67eb2c 1423
7ae457c1 1424void bpf_prog_destroy(struct bpf_prog *fp)
302d6637 1425{
7ae457c1 1426 __bpf_prog_release(fp);
302d6637 1427}
7ae457c1 1428EXPORT_SYMBOL_GPL(bpf_prog_destroy);
302d6637 1429
8ced425e 1430static 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		 1456static
1457struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1da177e4 1458{
009937e7 1459 unsigned int fsize = bpf_classic_proglen(fprog);
7ae457c1 1460 struct bpf_prog *prog;
1da177e4
LT		 1461 int err;
1462
d59577b6 1463 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1464 return ERR_PTR(-EPERM);
d59577b6 1465
1da177e4 1466 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1467 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
538950a1 1468 return ERR_PTR(-EINVAL);
1da177e4 1469
f7bd9e36 1470 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
7ae457c1 1471 if (!prog)
538950a1 1472 return ERR_PTR(-ENOMEM);
a3ea269b 1473
7ae457c1 1474 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
c0d1379a 1475 __bpf_prog_free(prog);
538950a1 1476 return ERR_PTR(-EFAULT);
1da177e4
LT		 1477 }
1478
7ae457c1 1479 prog->len = fprog->len;
1da177e4 1480
7ae457c1 1481 err = bpf_prog_store_orig_filter(prog, fprog);
a3ea269b 1482 if (err) {
c0d1379a 1483 __bpf_prog_free(prog);
538950a1 1484 return ERR_PTR(-ENOMEM);
a3ea269b
DB		 1485 }
1486
7ae457c1 1487 /* bpf_prepare_filter() already takes care of freeing
bd4cf0ed
AS		 1488 * memory in case something goes wrong.
1489 */
538950a1
CG		 1490 return bpf_prepare_filter(prog, NULL);
1491}
1492
1493/**
1494 * sk_attach_filter - attach a socket filter
1495 * @fprog: the filter program
1496 * @sk: the socket to use
1497 *
1498 * Attach the user's filter code. We first run some sanity checks on
1499 * it to make sure it does not explode on us later. If an error
1500 * occurs or there is insufficient memory for the filter a negative
1501 * errno code is returned. On success the return is zero.
1502 */
8ced425e 1503int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
538950a1
CG		 1504{
1505 struct bpf_prog *prog = __get_filter(fprog, sk);
1506 int err;
1507
7ae457c1
AS		 1508 if (IS_ERR(prog))
1509 return PTR_ERR(prog);
1510
8ced425e 1511 err = __sk_attach_prog(prog, sk);
49b31e57 1512 if (err < 0) {
7ae457c1 1513 __bpf_prog_release(prog);
49b31e57 1514 return err;
278571ba
AS		 1515 }
1516
d3904b73 1517 return 0;
1da177e4 1518}
8ced425e 1519EXPORT_SYMBOL_GPL(sk_attach_filter);
1da177e4 1520
538950a1 1521int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
89aa0758 1522{
538950a1 1523 struct bpf_prog *prog = __get_filter(fprog, sk);
49b31e57 1524 int err;
89aa0758 1525
538950a1
CG		 1526 if (IS_ERR(prog))
1527 return PTR_ERR(prog);
1528
8217ca65
MKL		 1529 if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1530 err = -ENOMEM;
1531 else
1532 err = reuseport_attach_prog(sk, prog);
1533
1534 if (err)
538950a1 1535 __bpf_prog_release(prog);
538950a1 1536
8217ca65 1537 return err;
538950a1
CG		 1538}
1539
1540static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1541{
89aa0758 1542 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1543 return ERR_PTR(-EPERM);
89aa0758 1544
113214be 1545 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
538950a1
CG		 1546}
1547
1548int sk_attach_bpf(u32 ufd, struct sock *sk)
1549{
1550 struct bpf_prog *prog = __get_bpf(ufd, sk);
1551 int err;
1552
1553 if (IS_ERR(prog))
1554 return PTR_ERR(prog);
1555
8ced425e 1556 err = __sk_attach_prog(prog, sk);
49b31e57 1557 if (err < 0) {
89aa0758 1558 bpf_prog_put(prog);
49b31e57 1559 return err;
89aa0758
AS		 1560 }
1561
89aa0758
AS		 1562 return 0;
1563}
1564
538950a1
CG		 1565int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1566{
8217ca65 1567 struct bpf_prog *prog;
538950a1
CG		 1568 int err;
1569
8217ca65
MKL		 1570 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1571 return -EPERM;
1572
1573 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1574 if (IS_ERR(prog) && PTR_ERR(prog) == -EINVAL)
1575 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
538950a1
CG		 1576 if (IS_ERR(prog))
1577 return PTR_ERR(prog);
1578
8217ca65
MKL		 1579 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1580 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1581 * bpf prog (e.g. sockmap). It depends on the
1582 * limitation imposed by bpf_prog_load().
1583 * Hence, sysctl_optmem_max is not checked.
1584 */
1585 if ((sk->sk_type != SOCK_STREAM &&
1586 sk->sk_type != SOCK_DGRAM) ||
1587 (sk->sk_protocol != IPPROTO_UDP &&
1588 sk->sk_protocol != IPPROTO_TCP) ||
1589 (sk->sk_family != AF_INET &&
1590 sk->sk_family != AF_INET6)) {
1591 err = -ENOTSUPP;
1592 goto err_prog_put;
1593 }
1594 } else {
1595 /* BPF_PROG_TYPE_SOCKET_FILTER */
1596 if (bpf_prog_size(prog->len) > sysctl_optmem_max) {
1597 err = -ENOMEM;
1598 goto err_prog_put;
1599 }
538950a1
CG		 1600 }
1601
8217ca65
MKL		 1602 err = reuseport_attach_prog(sk, prog);
1603err_prog_put:
1604 if (err)
1605 bpf_prog_put(prog);
1606
1607 return err;
1608}
1609
1610void sk_reuseport_prog_free(struct bpf_prog *prog)
1611{
1612 if (!prog)
1613 return;
1614
1615 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1616 bpf_prog_put(prog);
1617 else
1618 bpf_prog_destroy(prog);
538950a1
CG		 1619}
1620
21cafc1d
DB		 1621struct bpf_scratchpad {
1622 union {
1623 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1624 u8 buff[MAX_BPF_STACK];
1625 };
1626};
1627
1628static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
91bc4822 1629
5293efe6
DB		 1630static inline int __bpf_try_make_writable(struct sk_buff *skb,
1631 unsigned int write_len)
1632{
1633 return skb_ensure_writable(skb, write_len);
1634}
1635
db58ba45
AS		 1636static inline int bpf_try_make_writable(struct sk_buff *skb,
1637 unsigned int write_len)
1638{
5293efe6 1639 int err = __bpf_try_make_writable(skb, write_len);
db58ba45 1640
6aaae2b6 1641 bpf_compute_data_pointers(skb);
db58ba45
AS		 1642 return err;
1643}
1644
36bbef52
DB		 1645static int bpf_try_make_head_writable(struct sk_buff *skb)
1646{
1647 return bpf_try_make_writable(skb, skb_headlen(skb));
1648}
1649
a2bfe6bf
DB		 1650static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1651{
1652 if (skb_at_tc_ingress(skb))
1653 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1654}
1655
8065694e
DB		 1656static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1657{
1658 if (skb_at_tc_ingress(skb))
1659 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1660}
1661
f3694e00
DB		 1662BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1663 const void *, from, u32, len, u64, flags)
608cd71a 1664{
608cd71a
AS		 1665 void *ptr;
1666
8afd54c8 1667 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
781c53bc 1668 return -EINVAL;
0ed661d5 1669 if (unlikely(offset > 0xffff))
608cd71a 1670 return -EFAULT;
db58ba45 1671 if (unlikely(bpf_try_make_writable(skb, offset + len)))
608cd71a
AS		 1672 return -EFAULT;
1673
0ed661d5 1674 ptr = skb->data + offset;
781c53bc 1675 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1676 __skb_postpull_rcsum(skb, ptr, len, offset);
608cd71a
AS		 1677
1678 memcpy(ptr, from, len);
1679
781c53bc 1680 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1681 __skb_postpush_rcsum(skb, ptr, len, offset);
8afd54c8
DB		 1682 if (flags & BPF_F_INVALIDATE_HASH)
1683 skb_clear_hash(skb);
f8ffad69 1684
608cd71a
AS		 1685 return 0;
1686}
1687
577c50aa 1688static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
608cd71a
AS		 1689 .func = bpf_skb_store_bytes,
1690 .gpl_only = false,
1691 .ret_type = RET_INTEGER,
1692 .arg1_type = ARG_PTR_TO_CTX,
1693 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1694 .arg3_type = ARG_PTR_TO_MEM,
1695 .arg4_type = ARG_CONST_SIZE,
91bc4822
AS		 1696 .arg5_type = ARG_ANYTHING,
1697};
1698
f3694e00
DB		 1699BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1700 void *, to, u32, len)
05c74e5e 1701{
05c74e5e
DB		 1702 void *ptr;
1703
0ed661d5 1704 if (unlikely(offset > 0xffff))
074f528e 1705 goto err_clear;
05c74e5e
DB		 1706
1707 ptr = skb_header_pointer(skb, offset, len, to);
1708 if (unlikely(!ptr))
074f528e 1709 goto err_clear;
05c74e5e
DB		 1710 if (ptr != to)
1711 memcpy(to, ptr, len);
1712
1713 return 0;
074f528e
DB		 1714err_clear:
1715 memset(to, 0, len);
1716 return -EFAULT;
05c74e5e
DB		 1717}
1718
577c50aa 1719static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
05c74e5e
DB		 1720 .func = bpf_skb_load_bytes,
1721 .gpl_only = false,
1722 .ret_type = RET_INTEGER,
1723 .arg1_type = ARG_PTR_TO_CTX,
1724 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1725 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1726 .arg4_type = ARG_CONST_SIZE,
05c74e5e
DB		 1727};
1728
4e1ec56c
DB		 1729BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1730 u32, offset, void *, to, u32, len, u32, start_header)
1731{
3eee1f75
DB		 1732 u8 *end = skb_tail_pointer(skb);
1733 u8 *net = skb_network_header(skb);
1734 u8 *mac = skb_mac_header(skb);
4e1ec56c
DB		 1735 u8 *ptr;
1736
3eee1f75 1737 if (unlikely(offset > 0xffff || len > (end - mac)))
4e1ec56c
DB		 1738 goto err_clear;
1739
1740 switch (start_header) {
1741 case BPF_HDR_START_MAC:
3eee1f75 1742 ptr = mac + offset;
4e1ec56c
DB		 1743 break;
1744 case BPF_HDR_START_NET:
3eee1f75 1745 ptr = net + offset;
4e1ec56c
DB		 1746 break;
1747 default:
1748 goto err_clear;
1749 }
1750
3eee1f75 1751 if (likely(ptr >= mac && ptr + len <= end)) {
4e1ec56c
DB		 1752 memcpy(to, ptr, len);
1753 return 0;
1754 }
1755
1756err_clear:
1757 memset(to, 0, len);
1758 return -EFAULT;
1759}
1760
1761static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1762 .func = bpf_skb_load_bytes_relative,
1763 .gpl_only = false,
1764 .ret_type = RET_INTEGER,
1765 .arg1_type = ARG_PTR_TO_CTX,
1766 .arg2_type = ARG_ANYTHING,
1767 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1768 .arg4_type = ARG_CONST_SIZE,
1769 .arg5_type = ARG_ANYTHING,
1770};
1771
36bbef52
DB		 1772BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1773{
1774 /* Idea is the following: should the needed direct read/write
1775 * test fail during runtime, we can pull in more data and redo
1776 * again, since implicitly, we invalidate previous checks here.
1777 *
1778 * Or, since we know how much we need to make read/writeable,
1779 * this can be done once at the program beginning for direct
1780 * access case. By this we overcome limitations of only current
1781 * headroom being accessible.
1782 */
1783 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1784}
1785
1786static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1787 .func = bpf_skb_pull_data,
1788 .gpl_only = false,
1789 .ret_type = RET_INTEGER,
1790 .arg1_type = ARG_PTR_TO_CTX,
1791 .arg2_type = ARG_ANYTHING,
1792};
1793
0ea488ff
JF		 1794static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1795 unsigned int write_len)
1796{
1797 int err = __bpf_try_make_writable(skb, write_len);
1798
1799 bpf_compute_data_end_sk_skb(skb);
1800 return err;
1801}
1802
1803BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
1804{
1805 /* Idea is the following: should the needed direct read/write
1806 * test fail during runtime, we can pull in more data and redo
1807 * again, since implicitly, we invalidate previous checks here.
1808 *
1809 * Or, since we know how much we need to make read/writeable,
1810 * this can be done once at the program beginning for direct
1811 * access case. By this we overcome limitations of only current
1812 * headroom being accessible.
1813 */
1814 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1815}
1816
1817static const struct bpf_func_proto sk_skb_pull_data_proto = {
1818 .func = sk_skb_pull_data,
1819 .gpl_only = false,
1820 .ret_type = RET_INTEGER,
1821 .arg1_type = ARG_PTR_TO_CTX,
1822 .arg2_type = ARG_ANYTHING,
1823};
1824
f3694e00
DB		 1825BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1826 u64, from, u64, to, u64, flags)
91bc4822 1827{
0ed661d5 1828 __sum16 *ptr;
91bc4822 1829
781c53bc
DB		 1830 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1831 return -EINVAL;
0ed661d5 1832 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1833 return -EFAULT;
0ed661d5 1834 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1835 return -EFAULT;
1836
0ed661d5 1837 ptr = (__sum16 *)(skb->data + offset);
781c53bc 1838 switch (flags & BPF_F_HDR_FIELD_MASK) {
8050c0f0
DB		 1839 case 0:
1840 if (unlikely(from != 0))
1841 return -EINVAL;
1842
1843 csum_replace_by_diff(ptr, to);
1844 break;
91bc4822
AS		 1845 case 2:
1846 csum_replace2(ptr, from, to);
1847 break;
1848 case 4:
1849 csum_replace4(ptr, from, to);
1850 break;
1851 default:
1852 return -EINVAL;
1853 }
1854
91bc4822
AS		 1855 return 0;
1856}
1857
577c50aa 1858static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
91bc4822
AS		 1859 .func = bpf_l3_csum_replace,
1860 .gpl_only = false,
1861 .ret_type = RET_INTEGER,
1862 .arg1_type = ARG_PTR_TO_CTX,
1863 .arg2_type = ARG_ANYTHING,
1864 .arg3_type = ARG_ANYTHING,
1865 .arg4_type = ARG_ANYTHING,
1866 .arg5_type = ARG_ANYTHING,
1867};
1868
f3694e00
DB		 1869BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1870 u64, from, u64, to, u64, flags)
91bc4822 1871{
781c53bc 1872 bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
2f72959a 1873 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
d1b662ad 1874 bool do_mforce = flags & BPF_F_MARK_ENFORCE;
0ed661d5 1875 __sum16 *ptr;
91bc4822 1876
d1b662ad
DB		 1877 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1878 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
781c53bc 1879 return -EINVAL;
0ed661d5 1880 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1881 return -EFAULT;
0ed661d5 1882 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1883 return -EFAULT;
1884
0ed661d5 1885 ptr = (__sum16 *)(skb->data + offset);
d1b662ad 1886 if (is_mmzero && !do_mforce && !*ptr)
2f72959a 1887 return 0;
91bc4822 1888
781c53bc 1889 switch (flags & BPF_F_HDR_FIELD_MASK) {
7d672345
DB		 1890 case 0:
1891 if (unlikely(from != 0))
1892 return -EINVAL;
1893
1894 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1895 break;
91bc4822
AS		 1896 case 2:
1897 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1898 break;
1899 case 4:
1900 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1901 break;
1902 default:
1903 return -EINVAL;
1904 }
1905
2f72959a
DB		 1906 if (is_mmzero && !*ptr)
1907 *ptr = CSUM_MANGLED_0;
91bc4822
AS		 1908 return 0;
1909}
1910
577c50aa 1911static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
91bc4822
AS		 1912 .func = bpf_l4_csum_replace,
1913 .gpl_only = false,
1914 .ret_type = RET_INTEGER,
1915 .arg1_type = ARG_PTR_TO_CTX,
1916 .arg2_type = ARG_ANYTHING,
1917 .arg3_type = ARG_ANYTHING,
1918 .arg4_type = ARG_ANYTHING,
1919 .arg5_type = ARG_ANYTHING,
608cd71a
AS		 1920};
1921
f3694e00
DB		 1922BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1923 __be32 *, to, u32, to_size, __wsum, seed)
7d672345 1924{
21cafc1d 1925 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
f3694e00 1926 u32 diff_size = from_size + to_size;
7d672345
DB		 1927 int i, j = 0;
1928
1929 /* This is quite flexible, some examples:
1930 *
1931 * from_size == 0, to_size > 0, seed := csum --> pushing data
1932 * from_size > 0, to_size == 0, seed := csum --> pulling data
1933 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1934 *
1935 * Even for diffing, from_size and to_size don't need to be equal.
1936 */
1937 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1938 diff_size > sizeof(sp->diff)))
1939 return -EINVAL;
1940
1941 for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1942 sp->diff[j] = ~from[i];
1943 for (i = 0; i < to_size / sizeof(__be32); i++, j++)
1944 sp->diff[j] = to[i];
1945
1946 return csum_partial(sp->diff, diff_size, seed);
1947}
1948
577c50aa 1949static const struct bpf_func_proto bpf_csum_diff_proto = {
7d672345
DB		 1950 .func = bpf_csum_diff,
1951 .gpl_only = false,
36bbef52 1952 .pkt_access = true,
7d672345 1953 .ret_type = RET_INTEGER,
db1ac496 1954 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1955 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
db1ac496 1956 .arg3_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1957 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
7d672345
DB		 1958 .arg5_type = ARG_ANYTHING,
1959};
1960
36bbef52
DB		 1961BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
1962{
1963 /* The interface is to be used in combination with bpf_csum_diff()
1964 * for direct packet writes. csum rotation for alignment as well
1965 * as emulating csum_sub() can be done from the eBPF program.
1966 */
1967 if (skb->ip_summed == CHECKSUM_COMPLETE)
1968 return (skb->csum = csum_add(skb->csum, csum));
1969
1970 return -ENOTSUPP;
1971}
1972
1973static const struct bpf_func_proto bpf_csum_update_proto = {
1974 .func = bpf_csum_update,
1975 .gpl_only = false,
1976 .ret_type = RET_INTEGER,
1977 .arg1_type = ARG_PTR_TO_CTX,
1978 .arg2_type = ARG_ANYTHING,
1979};
1980
a70b506e
DB		 1981static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
1982{
a70b506e
DB		 1983 return dev_forward_skb(dev, skb);
1984}
1985
4e3264d2
MKL		 1986static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
1987 struct sk_buff *skb)
1988{
1989 int ret = ____dev_forward_skb(dev, skb);
1990
1991 if (likely(!ret)) {
1992 skb->dev = dev;
1993 ret = netif_rx(skb);
1994 }
1995
1996 return ret;
1997}
1998
a70b506e
DB		 1999static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2000{
2001 int ret;
2002
2003 if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) {
2004 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2005 kfree_skb(skb);
2006 return -ENETDOWN;
2007 }
2008
2009 skb->dev = dev;
2010
2011 __this_cpu_inc(xmit_recursion);
2012 ret = dev_queue_xmit(skb);
2013 __this_cpu_dec(xmit_recursion);
2014
2015 return ret;
2016}
2017
4e3264d2
MKL		 2018static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2019 u32 flags)
2020{
2021 /* skb->mac_len is not set on normal egress */
2022 unsigned int mlen = skb->network_header - skb->mac_header;
2023
2024 __skb_pull(skb, mlen);
2025
2026 /* At ingress, the mac header has already been pulled once.
2027 * At egress, skb_pospull_rcsum has to be done in case that
2028 * the skb is originated from ingress (i.e. a forwarded skb)
2029 * to ensure that rcsum starts at net header.
2030 */
2031 if (!skb_at_tc_ingress(skb))
2032 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
2033 skb_pop_mac_header(skb);
2034 skb_reset_mac_len(skb);
2035 return flags & BPF_F_INGRESS ?
2036 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
2037}
2038
2039static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2040 u32 flags)
2041{
3a0af8fd
TG		 2042 /* Verify that a link layer header is carried */
2043 if (unlikely(skb->mac_header >= skb->network_header)) {
2044 kfree_skb(skb);
2045 return -ERANGE;
2046 }
2047
4e3264d2
MKL		 2048 bpf_push_mac_rcsum(skb);
2049 return flags & BPF_F_INGRESS ?
2050 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2051}
2052
2053static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2054 u32 flags)
2055{
c491680f 2056 if (dev_is_mac_header_xmit(dev))
4e3264d2 2057 return __bpf_redirect_common(skb, dev, flags);
c491680f
DB		 2058 else
2059 return __bpf_redirect_no_mac(skb, dev, flags);
4e3264d2
MKL		 2060}
2061
f3694e00 2062BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
3896d655 2063{
3896d655 2064 struct net_device *dev;
36bbef52
DB		 2065 struct sk_buff *clone;
2066 int ret;
3896d655 2067
781c53bc
DB		 2068 if (unlikely(flags & ~(BPF_F_INGRESS)))
2069 return -EINVAL;
2070
3896d655
AS		 2071 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2072 if (unlikely(!dev))
2073 return -EINVAL;
2074
36bbef52
DB		 2075 clone = skb_clone(skb, GFP_ATOMIC);
2076 if (unlikely(!clone))
3896d655
AS		 2077 return -ENOMEM;
2078
36bbef52
DB		 2079 /* For direct write, we need to keep the invariant that the skbs
2080 * we're dealing with need to be uncloned. Should uncloning fail
2081 * here, we need to free the just generated clone to unclone once
2082 * again.
2083 */
2084 ret = bpf_try_make_head_writable(skb);
2085 if (unlikely(ret)) {
2086 kfree_skb(clone);
2087 return -ENOMEM;
2088 }
2089
4e3264d2 2090 return __bpf_redirect(clone, dev, flags);
3896d655
AS		 2091}
2092
577c50aa 2093static const struct bpf_func_proto bpf_clone_redirect_proto = {
3896d655
AS		 2094 .func = bpf_clone_redirect,
2095 .gpl_only = false,
2096 .ret_type = RET_INTEGER,
2097 .arg1_type = ARG_PTR_TO_CTX,
2098 .arg2_type = ARG_ANYTHING,
2099 .arg3_type = ARG_ANYTHING,
2100};
2101
0b19cc0a
TM		 2102DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2103EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
781c53bc 2104
f3694e00 2105BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
27b29f63 2106{
0b19cc0a 2107 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
27b29f63 2108
781c53bc
DB		 2109 if (unlikely(flags & ~(BPF_F_INGRESS)))
2110 return TC_ACT_SHOT;
2111
27b29f63
AS		 2112 ri->ifindex = ifindex;
2113 ri->flags = flags;
781c53bc 2114
27b29f63
AS		 2115 return TC_ACT_REDIRECT;
2116}
2117
2118int skb_do_redirect(struct sk_buff *skb)
2119{
0b19cc0a 2120 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
27b29f63
AS		 2121 struct net_device *dev;
2122
2123 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
2124 ri->ifindex = 0;
2125 if (unlikely(!dev)) {
2126 kfree_skb(skb);
2127 return -EINVAL;
2128 }
2129
4e3264d2 2130 return __bpf_redirect(skb, dev, ri->flags);
27b29f63
AS		 2131}
2132
577c50aa 2133static const struct bpf_func_proto bpf_redirect_proto = {
27b29f63
AS		 2134 .func = bpf_redirect,
2135 .gpl_only = false,
2136 .ret_type = RET_INTEGER,
2137 .arg1_type = ARG_ANYTHING,
2138 .arg2_type = ARG_ANYTHING,
2139};
2140
81110384
JF		 2141BPF_CALL_4(bpf_sk_redirect_hash, struct sk_buff *, skb,
2142 struct bpf_map *, map, void *, key, u64, flags)
2143{
2144 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
2145
2146 /* If user passes invalid input drop the packet. */
2147 if (unlikely(flags & ~(BPF_F_INGRESS)))
2148 return SK_DROP;
2149
2150 tcb->bpf.flags = flags;
2151 tcb->bpf.sk_redir = __sock_hash_lookup_elem(map, key);
2152 if (!tcb->bpf.sk_redir)
2153 return SK_DROP;
2154
2155 return SK_PASS;
2156}
2157
2158static const struct bpf_func_proto bpf_sk_redirect_hash_proto = {
2159 .func = bpf_sk_redirect_hash,
2160 .gpl_only = false,
2161 .ret_type = RET_INTEGER,
2162 .arg1_type = ARG_PTR_TO_CTX,
2163 .arg2_type = ARG_CONST_MAP_PTR,
2164 .arg3_type = ARG_PTR_TO_MAP_KEY,
2165 .arg4_type = ARG_ANYTHING,
2166};
2167
34f79502
JF		 2168BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
2169 struct bpf_map *, map, u32, key, u64, flags)
174a79ff 2170{
34f79502 2171 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
174a79ff 2172
bfa64075 2173 /* If user passes invalid input drop the packet. */
fa246693 2174 if (unlikely(flags & ~(BPF_F_INGRESS)))
bfa64075 2175 return SK_DROP;
174a79ff 2176
34f79502 2177 tcb->bpf.flags = flags;
e5cd3abc
JF		 2178 tcb->bpf.sk_redir = __sock_map_lookup_elem(map, key);
2179 if (!tcb->bpf.sk_redir)
2180 return SK_DROP;
174a79ff 2181
bfa64075 2182 return SK_PASS;
174a79ff
JF		 2183}
2184
34f79502 2185struct sock *do_sk_redirect_map(struct sk_buff *skb)
174a79ff 2186{
34f79502 2187 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
174a79ff 2188
e5cd3abc 2189 return tcb->bpf.sk_redir;
174a79ff
JF		 2190}
2191
2192static const struct bpf_func_proto bpf_sk_redirect_map_proto = {
2193 .func = bpf_sk_redirect_map,
2194 .gpl_only = false,
2195 .ret_type = RET_INTEGER,
34f79502
JF		 2196 .arg1_type = ARG_PTR_TO_CTX,
2197 .arg2_type = ARG_CONST_MAP_PTR,
174a79ff 2198 .arg3_type = ARG_ANYTHING,
34f79502 2199 .arg4_type = ARG_ANYTHING,
174a79ff
JF		 2200};
2201
81110384
JF		 2202BPF_CALL_4(bpf_msg_redirect_hash, struct sk_msg_buff *, msg,
2203 struct bpf_map *, map, void *, key, u64, flags)
2204{
2205 /* If user passes invalid input drop the packet. */
2206 if (unlikely(flags & ~(BPF_F_INGRESS)))
2207 return SK_DROP;
2208
2209 msg->flags = flags;
2210 msg->sk_redir = __sock_hash_lookup_elem(map, key);
2211 if (!msg->sk_redir)
2212 return SK_DROP;
2213
2214 return SK_PASS;
2215}
2216
2217static const struct bpf_func_proto bpf_msg_redirect_hash_proto = {
2218 .func = bpf_msg_redirect_hash,
2219 .gpl_only = false,
2220 .ret_type = RET_INTEGER,
2221 .arg1_type = ARG_PTR_TO_CTX,
2222 .arg2_type = ARG_CONST_MAP_PTR,
2223 .arg3_type = ARG_PTR_TO_MAP_KEY,
2224 .arg4_type = ARG_ANYTHING,
2225};
2226
4f738adb
JF		 2227BPF_CALL_4(bpf_msg_redirect_map, struct sk_msg_buff *, msg,
2228 struct bpf_map *, map, u32, key, u64, flags)
2229{
2230 /* If user passes invalid input drop the packet. */
8934ce2f 2231 if (unlikely(flags & ~(BPF_F_INGRESS)))
4f738adb
JF		 2232 return SK_DROP;
2233
4f738adb 2234 msg->flags = flags;
e5cd3abc
JF		 2235 msg->sk_redir = __sock_map_lookup_elem(map, key);
2236 if (!msg->sk_redir)
2237 return SK_DROP;
4f738adb
JF		 2238
2239 return SK_PASS;
2240}
2241
2242struct sock *do_msg_redirect_map(struct sk_msg_buff *msg)
2243{
e5cd3abc 2244 return msg->sk_redir;
4f738adb
JF		 2245}
2246
2247static const struct bpf_func_proto bpf_msg_redirect_map_proto = {
2248 .func = bpf_msg_redirect_map,
2249 .gpl_only = false,
2250 .ret_type = RET_INTEGER,
2251 .arg1_type = ARG_PTR_TO_CTX,
2252 .arg2_type = ARG_CONST_MAP_PTR,
2253 .arg3_type = ARG_ANYTHING,
2254 .arg4_type = ARG_ANYTHING,
2255};
2256
2a100317
JF		 2257BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg_buff *, msg, u32, bytes)
2258{
2259 msg->apply_bytes = bytes;
2260 return 0;
2261}
2262
2263static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2264 .func = bpf_msg_apply_bytes,
2265 .gpl_only = false,
2266 .ret_type = RET_INTEGER,
2267 .arg1_type = ARG_PTR_TO_CTX,
2268 .arg2_type = ARG_ANYTHING,
2269};
2270
91843d54
JF		 2271BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg_buff *, msg, u32, bytes)
2272{
2273 msg->cork_bytes = bytes;
2274 return 0;
2275}
2276
2277static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2278 .func = bpf_msg_cork_bytes,
2279 .gpl_only = false,
2280 .ret_type = RET_INTEGER,
2281 .arg1_type = ARG_PTR_TO_CTX,
2282 .arg2_type = ARG_ANYTHING,
2283};
2284
015632bb
JF		 2285BPF_CALL_4(bpf_msg_pull_data,
2286 struct sk_msg_buff *, msg, u32, start, u32, end, u64, flags)
2287{
2288 unsigned int len = 0, offset = 0, copy = 0;
2289 struct scatterlist *sg = msg->sg_data;
2290 int first_sg, last_sg, i, shift;
2291 unsigned char *p, *to, *from;
2292 int bytes = end - start;
2293 struct page *page;
2294
2295 if (unlikely(flags || end <= start))
2296 return -EINVAL;
2297
2298 /* First find the starting scatterlist element */
2299 i = msg->sg_start;
2300 do {
2301 len = sg[i].length;
2302 offset += len;
2303 if (start < offset + len)
2304 break;
2305 i++;
2306 if (i == MAX_SKB_FRAGS)
2307 i = 0;
2308 } while (i != msg->sg_end);
2309
2310 if (unlikely(start >= offset + len))
2311 return -EINVAL;
2312
2313 if (!msg->sg_copy[i] && bytes <= len)
2314 goto out;
2315
2316 first_sg = i;
2317
2318 /* At this point we need to linearize multiple scatterlist
2319 * elements or a single shared page. Either way we need to
2320 * copy into a linear buffer exclusively owned by BPF. Then
2321 * place the buffer in the scatterlist and fixup the original
2322 * entries by removing the entries now in the linear buffer
2323 * and shifting the remaining entries. For now we do not try
2324 * to copy partial entries to avoid complexity of running out
2325 * of sg_entry slots. The downside is reading a single byte
2326 * will copy the entire sg entry.
2327 */
2328 do {
2329 copy += sg[i].length;
2330 i++;
2331 if (i == MAX_SKB_FRAGS)
2332 i = 0;
2333 if (bytes < copy)
2334 break;
2335 } while (i != msg->sg_end);
2336 last_sg = i;
2337
2338 if (unlikely(copy < end - start))
2339 return -EINVAL;
2340
2341 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC, get_order(copy));
2342 if (unlikely(!page))
2343 return -ENOMEM;
2344 p = page_address(page);
2345 offset = 0;
2346
2347 i = first_sg;
2348 do {
2349 from = sg_virt(&sg[i]);
2350 len = sg[i].length;
2351 to = p + offset;
2352
2353 memcpy(to, from, len);
2354 offset += len;
2355 sg[i].length = 0;
2356 put_page(sg_page(&sg[i]));
2357
2358 i++;
2359 if (i == MAX_SKB_FRAGS)
2360 i = 0;
2361 } while (i != last_sg);
2362
2363 sg[first_sg].length = copy;
2364 sg_set_page(&sg[first_sg], page, copy, 0);
2365
2366 /* To repair sg ring we need to shift entries. If we only
2367 * had a single entry though we can just replace it and
2368 * be done. Otherwise walk the ring and shift the entries.
2369 */
2370 shift = last_sg - first_sg - 1;
2371 if (!shift)
2372 goto out;
2373
2374 i = first_sg + 1;
2375 do {
2376 int move_from;
2377
2378 if (i + shift >= MAX_SKB_FRAGS)
2379 move_from = i + shift - MAX_SKB_FRAGS;
2380 else
2381 move_from = i + shift;
2382
2383 if (move_from == msg->sg_end)
2384 break;
2385
2386 sg[i] = sg[move_from];
2387 sg[move_from].length = 0;
2388 sg[move_from].page_link = 0;
2389 sg[move_from].offset = 0;
2390
2391 i++;
2392 if (i == MAX_SKB_FRAGS)
2393 i = 0;
2394 } while (1);
2395 msg->sg_end -= shift;
2396 if (msg->sg_end < 0)
2397 msg->sg_end += MAX_SKB_FRAGS;
2398out:
2399 msg->data = sg_virt(&sg[i]) + start - offset;
2400 msg->data_end = msg->data + bytes;
2401
2402 return 0;
2403}
2404
2405static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2406 .func = bpf_msg_pull_data,
2407 .gpl_only = false,
2408 .ret_type = RET_INTEGER,
2409 .arg1_type = ARG_PTR_TO_CTX,
2410 .arg2_type = ARG_ANYTHING,
2411 .arg3_type = ARG_ANYTHING,
2412 .arg4_type = ARG_ANYTHING,
2413};
2414
f3694e00 2415BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
8d20aabe 2416{
f3694e00 2417 return task_get_classid(skb);
8d20aabe
DB		 2418}
2419
2420static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
2421 .func = bpf_get_cgroup_classid,
2422 .gpl_only = false,
2423 .ret_type = RET_INTEGER,
2424 .arg1_type = ARG_PTR_TO_CTX,
2425};
2426
f3694e00 2427BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
c46646d0 2428{
f3694e00 2429 return dst_tclassid(skb);
c46646d0
DB		 2430}
2431
2432static const struct bpf_func_proto bpf_get_route_realm_proto = {
2433 .func = bpf_get_route_realm,
2434 .gpl_only = false,
2435 .ret_type = RET_INTEGER,
2436 .arg1_type = ARG_PTR_TO_CTX,
2437};
2438
f3694e00 2439BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
13c5c240
DB		 2440{
2441 /* If skb_clear_hash() was called due to mangling, we can
2442 * trigger SW recalculation here. Later access to hash
2443 * can then use the inline skb->hash via context directly
2444 * instead of calling this helper again.
2445 */
f3694e00 2446 return skb_get_hash(skb);
13c5c240
DB		 2447}
2448
2449static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
2450 .func = bpf_get_hash_recalc,
2451 .gpl_only = false,
2452 .ret_type = RET_INTEGER,
2453 .arg1_type = ARG_PTR_TO_CTX,
2454};
2455
7a4b28c6
DB		 2456BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
2457{
2458 /* After all direct packet write, this can be used once for
2459 * triggering a lazy recalc on next skb_get_hash() invocation.
2460 */
2461 skb_clear_hash(skb);
2462 return 0;
2463}
2464
2465static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
2466 .func = bpf_set_hash_invalid,
2467 .gpl_only = false,
2468 .ret_type = RET_INTEGER,
2469 .arg1_type = ARG_PTR_TO_CTX,
2470};
2471
ded092cd
DB		 2472BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
2473{
2474 /* Set user specified hash as L4(+), so that it gets returned
2475 * on skb_get_hash() call unless BPF prog later on triggers a
2476 * skb_clear_hash().
2477 */
2478 __skb_set_sw_hash(skb, hash, true);
2479 return 0;
2480}
2481
2482static const struct bpf_func_proto bpf_set_hash_proto = {
2483 .func = bpf_set_hash,
2484 .gpl_only = false,
2485 .ret_type = RET_INTEGER,
2486 .arg1_type = ARG_PTR_TO_CTX,
2487 .arg2_type = ARG_ANYTHING,
2488};
2489
f3694e00
DB		 2490BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
2491 u16, vlan_tci)
4e10df9a 2492{
db58ba45 2493 int ret;
4e10df9a
AS		 2494
2495 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
2496 vlan_proto != htons(ETH_P_8021AD)))
2497 vlan_proto = htons(ETH_P_8021Q);
2498
8065694e 2499 bpf_push_mac_rcsum(skb);
db58ba45 2500 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
8065694e
DB		 2501 bpf_pull_mac_rcsum(skb);
2502
6aaae2b6 2503 bpf_compute_data_pointers(skb);
db58ba45 2504 return ret;
4e10df9a
AS		 2505}
2506
93731ef0 2507static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
4e10df9a
AS		 2508 .func = bpf_skb_vlan_push,
2509 .gpl_only = false,
2510 .ret_type = RET_INTEGER,
2511 .arg1_type = ARG_PTR_TO_CTX,
2512 .arg2_type = ARG_ANYTHING,
2513 .arg3_type = ARG_ANYTHING,
2514};
2515
f3694e00 2516BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
4e10df9a 2517{
db58ba45 2518 int ret;
4e10df9a 2519
8065694e 2520 bpf_push_mac_rcsum(skb);
db58ba45 2521 ret = skb_vlan_pop(skb);
8065694e
DB		 2522 bpf_pull_mac_rcsum(skb);
2523
6aaae2b6 2524 bpf_compute_data_pointers(skb);
db58ba45 2525 return ret;
4e10df9a
AS		 2526}
2527
93731ef0 2528static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
4e10df9a
AS		 2529 .func = bpf_skb_vlan_pop,
2530 .gpl_only = false,
2531 .ret_type = RET_INTEGER,
2532 .arg1_type = ARG_PTR_TO_CTX,
2533};
2534
6578171a
DB		 2535static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2536{
2537 /* Caller already did skb_cow() with len as headroom,
2538 * so no need to do it here.
2539 */
2540 skb_push(skb, len);
2541 memmove(skb->data, skb->data + len, off);
2542 memset(skb->data + off, 0, len);
2543
2544 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2545 * needed here as it does not change the skb->csum
2546 * result for checksum complete when summing over
2547 * zeroed blocks.
2548 */
2549 return 0;
2550}
2551
2552static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2553{
2554 /* skb_ensure_writable() is not needed here, as we're
2555 * already working on an uncloned skb.
2556 */
2557 if (unlikely(!pskb_may_pull(skb, off + len)))
2558 return -ENOMEM;
2559
2560 skb_postpull_rcsum(skb, skb->data + off, len);
2561 memmove(skb->data + len, skb->data, off);
2562 __skb_pull(skb, len);
2563
2564 return 0;
2565}
2566
2567static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2568{
2569 bool trans_same = skb->transport_header == skb->network_header;
2570 int ret;
2571
2572 /* There's no need for __skb_push()/__skb_pull() pair to
2573 * get to the start of the mac header as we're guaranteed
2574 * to always start from here under eBPF.
2575 */
2576 ret = bpf_skb_generic_push(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
2587static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2588{
2589 bool trans_same = skb->transport_header == skb->network_header;
2590 int ret;
2591
2592 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2593 ret = bpf_skb_generic_pop(skb, off, len);
2594 if (likely(!ret)) {
2595 skb->mac_header += len;
2596 skb->network_header += len;
2597 if (trans_same)
2598 skb->transport_header = skb->network_header;
2599 }
2600
2601 return ret;
2602}
2603
2604static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2605{
2606 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2607 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2608 int ret;
2609
d02f51cb
DA		 2610 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2611 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2612 return -ENOTSUPP;
2613
6578171a
DB		 2614 ret = skb_cow(skb, len_diff);
2615 if (unlikely(ret < 0))
2616 return ret;
2617
2618 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2619 if (unlikely(ret < 0))
2620 return ret;
2621
2622 if (skb_is_gso(skb)) {
d02f51cb
DA		 2623 struct skb_shared_info *shinfo = skb_shinfo(skb);
2624
880388aa
DM		 2625 /* SKB_GSO_TCPV4 needs to be changed into
2626 * SKB_GSO_TCPV6.
6578171a 2627 */
d02f51cb
DA		 2628 if (shinfo->gso_type & SKB_GSO_TCPV4) {
2629 shinfo->gso_type &= ~SKB_GSO_TCPV4;
2630 shinfo->gso_type |= SKB_GSO_TCPV6;
6578171a
DB		 2631 }
2632
2633 /* Due to IPv6 header, MSS needs to be downgraded. */
d02f51cb 2634 skb_decrease_gso_size(shinfo, len_diff);
6578171a 2635 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2636 shinfo->gso_type |= SKB_GSO_DODGY;
2637 shinfo->gso_segs = 0;
6578171a
DB		 2638 }
2639
2640 skb->protocol = htons(ETH_P_IPV6);
2641 skb_clear_hash(skb);
2642
2643 return 0;
2644}
2645
2646static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2647{
2648 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2649 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2650 int ret;
2651
d02f51cb
DA		 2652 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2653 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2654 return -ENOTSUPP;
2655
6578171a
DB		 2656 ret = skb_unclone(skb, GFP_ATOMIC);
2657 if (unlikely(ret < 0))
2658 return ret;
2659
2660 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2661 if (unlikely(ret < 0))
2662 return ret;
2663
2664 if (skb_is_gso(skb)) {
d02f51cb
DA		 2665 struct skb_shared_info *shinfo = skb_shinfo(skb);
2666
880388aa
DM		 2667 /* SKB_GSO_TCPV6 needs to be changed into
2668 * SKB_GSO_TCPV4.
6578171a 2669 */
d02f51cb
DA		 2670 if (shinfo->gso_type & SKB_GSO_TCPV6) {
2671 shinfo->gso_type &= ~SKB_GSO_TCPV6;
2672 shinfo->gso_type |= SKB_GSO_TCPV4;
6578171a
DB		 2673 }
2674
2675 /* Due to IPv4 header, MSS can be upgraded. */
d02f51cb 2676 skb_increase_gso_size(shinfo, len_diff);
6578171a 2677 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2678 shinfo->gso_type |= SKB_GSO_DODGY;
2679 shinfo->gso_segs = 0;
6578171a
DB		 2680 }
2681
2682 skb->protocol = htons(ETH_P_IP);
2683 skb_clear_hash(skb);
2684
2685 return 0;
2686}
2687
2688static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2689{
2690 __be16 from_proto = skb->protocol;
2691
2692 if (from_proto == htons(ETH_P_IP) &&
2693 to_proto == htons(ETH_P_IPV6))
2694 return bpf_skb_proto_4_to_6(skb);
2695
2696 if (from_proto == htons(ETH_P_IPV6) &&
2697 to_proto == htons(ETH_P_IP))
2698 return bpf_skb_proto_6_to_4(skb);
2699
2700 return -ENOTSUPP;
2701}
2702
f3694e00
DB		 2703BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2704 u64, flags)
6578171a 2705{
6578171a
DB		 2706 int ret;
2707
2708 if (unlikely(flags))
2709 return -EINVAL;
2710
2711 /* General idea is that this helper does the basic groundwork
2712 * needed for changing the protocol, and eBPF program fills the
2713 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2714 * and other helpers, rather than passing a raw buffer here.
2715 *
2716 * The rationale is to keep this minimal and without a need to
2717 * deal with raw packet data. F.e. even if we would pass buffers
2718 * here, the program still needs to call the bpf_lX_csum_replace()
2719 * helpers anyway. Plus, this way we keep also separation of
2720 * concerns, since f.e. bpf_skb_store_bytes() should only take
2721 * care of stores.
2722 *
2723 * Currently, additional options and extension header space are
2724 * not supported, but flags register is reserved so we can adapt
2725 * that. For offloads, we mark packet as dodgy, so that headers
2726 * need to be verified first.
2727 */
2728 ret = bpf_skb_proto_xlat(skb, proto);
6aaae2b6 2729 bpf_compute_data_pointers(skb);
6578171a
DB		 2730 return ret;
2731}
2732
2733static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2734 .func = bpf_skb_change_proto,
2735 .gpl_only = false,
2736 .ret_type = RET_INTEGER,
2737 .arg1_type = ARG_PTR_TO_CTX,
2738 .arg2_type = ARG_ANYTHING,
2739 .arg3_type = ARG_ANYTHING,
2740};
2741
f3694e00 2742BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
d2485c42 2743{
d2485c42 2744 /* We only allow a restricted subset to be changed for now. */
45c7fffa
DB		 2745 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2746 !skb_pkt_type_ok(pkt_type)))
d2485c42
DB		 2747 return -EINVAL;
2748
2749 skb->pkt_type = pkt_type;
2750 return 0;
2751}
2752
2753static const struct bpf_func_proto bpf_skb_change_type_proto = {
2754 .func = bpf_skb_change_type,
2755 .gpl_only = false,
2756 .ret_type = RET_INTEGER,
2757 .arg1_type = ARG_PTR_TO_CTX,
2758 .arg2_type = ARG_ANYTHING,
2759};
2760
2be7e212
DB		 2761static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2762{
2763 switch (skb->protocol) {
2764 case htons(ETH_P_IP):
2765 return sizeof(struct iphdr);
2766 case htons(ETH_P_IPV6):
2767 return sizeof(struct ipv6hdr);
2768 default:
2769 return ~0U;
2770 }
2771}
2772
2773static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff)
2774{
2775 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2776 int ret;
2777
d02f51cb
DA		 2778 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2779 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2780 return -ENOTSUPP;
2781
2be7e212
DB		 2782 ret = skb_cow(skb, len_diff);
2783 if (unlikely(ret < 0))
2784 return ret;
2785
2786 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2787 if (unlikely(ret < 0))
2788 return ret;
2789
2790 if (skb_is_gso(skb)) {
d02f51cb
DA		 2791 struct skb_shared_info *shinfo = skb_shinfo(skb);
2792
2be7e212 2793 /* Due to header grow, MSS needs to be downgraded. */
d02f51cb 2794 skb_decrease_gso_size(shinfo, len_diff);
2be7e212 2795 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2796 shinfo->gso_type |= SKB_GSO_DODGY;
2797 shinfo->gso_segs = 0;
2be7e212
DB		 2798 }
2799
2800 return 0;
2801}
2802
2803static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff)
2804{
2805 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2806 int ret;
2807
d02f51cb
DA		 2808 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2809 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2810 return -ENOTSUPP;
2811
2be7e212
DB		 2812 ret = skb_unclone(skb, GFP_ATOMIC);
2813 if (unlikely(ret < 0))
2814 return ret;
2815
2816 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2817 if (unlikely(ret < 0))
2818 return ret;
2819
2820 if (skb_is_gso(skb)) {
d02f51cb
DA		 2821 struct skb_shared_info *shinfo = skb_shinfo(skb);
2822
2be7e212 2823 /* Due to header shrink, MSS can be upgraded. */
d02f51cb 2824 skb_increase_gso_size(shinfo, len_diff);
2be7e212 2825 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2826 shinfo->gso_type |= SKB_GSO_DODGY;
2827 shinfo->gso_segs = 0;
2be7e212
DB		 2828 }
2829
2830 return 0;
2831}
2832
2833static u32 __bpf_skb_max_len(const struct sk_buff *skb)
2834{
0c6bc6e5
JF		 2835 return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
2836 SKB_MAX_ALLOC;
2be7e212
DB		 2837}
2838
2839static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
2840{
2841 bool trans_same = skb->transport_header == skb->network_header;
2842 u32 len_cur, len_diff_abs = abs(len_diff);
2843 u32 len_min = bpf_skb_net_base_len(skb);
2844 u32 len_max = __bpf_skb_max_len(skb);
2845 __be16 proto = skb->protocol;
2846 bool shrink = len_diff < 0;
2847 int ret;
2848
2849 if (unlikely(len_diff_abs > 0xfffU))
2850 return -EFAULT;
2851 if (unlikely(proto != htons(ETH_P_IP) &&
2852 proto != htons(ETH_P_IPV6)))
2853 return -ENOTSUPP;
2854
2855 len_cur = skb->len - skb_network_offset(skb);
2856 if (skb_transport_header_was_set(skb) && !trans_same)
2857 len_cur = skb_network_header_len(skb);
2858 if ((shrink && (len_diff_abs >= len_cur ||
2859 len_cur - len_diff_abs < len_min)) ||
2860 (!shrink && (skb->len + len_diff_abs > len_max &&
2861 !skb_is_gso(skb))))
2862 return -ENOTSUPP;
2863
2864 ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) :
2865 bpf_skb_net_grow(skb, len_diff_abs);
2866
6aaae2b6 2867 bpf_compute_data_pointers(skb);
e4a6a342 2868 return ret;
2be7e212
DB		 2869}
2870
2871BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
2872 u32, mode, u64, flags)
2873{
2874 if (unlikely(flags))
2875 return -EINVAL;
2876 if (likely(mode == BPF_ADJ_ROOM_NET))
2877 return bpf_skb_adjust_net(skb, len_diff);
2878
2879 return -ENOTSUPP;
2880}
2881
2882static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
2883 .func = bpf_skb_adjust_room,
2884 .gpl_only = false,
2885 .ret_type = RET_INTEGER,
2886 .arg1_type = ARG_PTR_TO_CTX,
2887 .arg2_type = ARG_ANYTHING,
2888 .arg3_type = ARG_ANYTHING,
2889 .arg4_type = ARG_ANYTHING,
2890};
2891
5293efe6
DB		 2892static u32 __bpf_skb_min_len(const struct sk_buff *skb)
2893{
2894 u32 min_len = skb_network_offset(skb);
2895
2896 if (skb_transport_header_was_set(skb))
2897 min_len = skb_transport_offset(skb);
2898 if (skb->ip_summed == CHECKSUM_PARTIAL)
2899 min_len = skb_checksum_start_offset(skb) +
2900 skb->csum_offset + sizeof(__sum16);
2901 return min_len;
2902}
2903
5293efe6
DB		 2904static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
2905{
2906 unsigned int old_len = skb->len;
2907 int ret;
2908
2909 ret = __skb_grow_rcsum(skb, new_len);
2910 if (!ret)
2911 memset(skb->data + old_len, 0, new_len - old_len);
2912 return ret;
2913}
2914
2915static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
2916{
2917 return __skb_trim_rcsum(skb, new_len);
2918}
2919
0ea488ff
JF		 2920static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
2921 u64 flags)
5293efe6 2922{
5293efe6
DB		 2923 u32 max_len = __bpf_skb_max_len(skb);
2924 u32 min_len = __bpf_skb_min_len(skb);
5293efe6
DB		 2925 int ret;
2926
2927 if (unlikely(flags || new_len > max_len || new_len < min_len))
2928 return -EINVAL;
2929 if (skb->encapsulation)
2930 return -ENOTSUPP;
2931
2932 /* The basic idea of this helper is that it's performing the
2933 * needed work to either grow or trim an skb, and eBPF program
2934 * rewrites the rest via helpers like bpf_skb_store_bytes(),
2935 * bpf_lX_csum_replace() and others rather than passing a raw
2936 * buffer here. This one is a slow path helper and intended
2937 * for replies with control messages.
2938 *
2939 * Like in bpf_skb_change_proto(), we want to keep this rather
2940 * minimal and without protocol specifics so that we are able
2941 * to separate concerns as in bpf_skb_store_bytes() should only
2942 * be the one responsible for writing buffers.
2943 *
2944 * It's really expected to be a slow path operation here for
2945 * control message replies, so we're implicitly linearizing,
2946 * uncloning and drop offloads from the skb by this.
2947 */
2948 ret = __bpf_try_make_writable(skb, skb->len);
2949 if (!ret) {
2950 if (new_len > skb->len)
2951 ret = bpf_skb_grow_rcsum(skb, new_len);
2952 else if (new_len < skb->len)
2953 ret = bpf_skb_trim_rcsum(skb, new_len);
2954 if (!ret && skb_is_gso(skb))
2955 skb_gso_reset(skb);
2956 }
0ea488ff
JF		 2957 return ret;
2958}
2959
2960BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
2961 u64, flags)
2962{
2963 int ret = __bpf_skb_change_tail(skb, new_len, flags);
5293efe6 2964
6aaae2b6 2965 bpf_compute_data_pointers(skb);
5293efe6
DB		 2966 return ret;
2967}
2968
2969static const struct bpf_func_proto bpf_skb_change_tail_proto = {
2970 .func = bpf_skb_change_tail,
2971 .gpl_only = false,
2972 .ret_type = RET_INTEGER,
2973 .arg1_type = ARG_PTR_TO_CTX,
2974 .arg2_type = ARG_ANYTHING,
2975 .arg3_type = ARG_ANYTHING,
2976};
2977
0ea488ff 2978BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3a0af8fd 2979 u64, flags)
0ea488ff
JF		 2980{
2981 int ret = __bpf_skb_change_tail(skb, new_len, flags);
2982
2983 bpf_compute_data_end_sk_skb(skb);
2984 return ret;
2985}
2986
2987static const struct bpf_func_proto sk_skb_change_tail_proto = {
2988 .func = sk_skb_change_tail,
2989 .gpl_only = false,
2990 .ret_type = RET_INTEGER,
2991 .arg1_type = ARG_PTR_TO_CTX,
2992 .arg2_type = ARG_ANYTHING,
2993 .arg3_type = ARG_ANYTHING,
2994};
2995
2996static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
2997 u64 flags)
3a0af8fd
TG		 2998{
2999 u32 max_len = __bpf_skb_max_len(skb);
3000 u32 new_len = skb->len + head_room;
3001 int ret;
3002
3003 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
3004 new_len < skb->len))
3005 return -EINVAL;
3006
3007 ret = skb_cow(skb, head_room);
3008 if (likely(!ret)) {
3009 /* Idea for this helper is that we currently only
3010 * allow to expand on mac header. This means that
3011 * skb->protocol network header, etc, stay as is.
3012 * Compared to bpf_skb_change_tail(), we're more
3013 * flexible due to not needing to linearize or
3014 * reset GSO. Intention for this helper is to be
3015 * used by an L3 skb that needs to push mac header
3016 * for redirection into L2 device.
3017 */
3018 __skb_push(skb, head_room);
3019 memset(skb->data, 0, head_room);
3020 skb_reset_mac_header(skb);
3021 }
3022
0ea488ff
JF		 3023 return ret;
3024}
3025
3026BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
3027 u64, flags)
3028{
3029 int ret = __bpf_skb_change_head(skb, head_room, flags);
3030
6aaae2b6 3031 bpf_compute_data_pointers(skb);
0ea488ff 3032 return ret;
3a0af8fd
TG		 3033}
3034
3035static const struct bpf_func_proto bpf_skb_change_head_proto = {
3036 .func = bpf_skb_change_head,
3037 .gpl_only = false,
3038 .ret_type = RET_INTEGER,
3039 .arg1_type = ARG_PTR_TO_CTX,
3040 .arg2_type = ARG_ANYTHING,
3041 .arg3_type = ARG_ANYTHING,
3042};
3043
0ea488ff
JF		 3044BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
3045 u64, flags)
3046{
3047 int ret = __bpf_skb_change_head(skb, head_room, flags);
3048
3049 bpf_compute_data_end_sk_skb(skb);
3050 return ret;
3051}
3052
3053static const struct bpf_func_proto sk_skb_change_head_proto = {
3054 .func = sk_skb_change_head,
3055 .gpl_only = false,
3056 .ret_type = RET_INTEGER,
3057 .arg1_type = ARG_PTR_TO_CTX,
3058 .arg2_type = ARG_ANYTHING,
3059 .arg3_type = ARG_ANYTHING,
3060};
de8f3a83
DB		 3061static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
3062{
3063 return xdp_data_meta_unsupported(xdp) ? 0 :
3064 xdp->data - xdp->data_meta;
3065}
3066
17bedab2
MKL		 3067BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
3068{
6dfb970d 3069 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
de8f3a83 3070 unsigned long metalen = xdp_get_metalen(xdp);
97e19cce 3071 void *data_start = xdp_frame_end + metalen;
17bedab2
MKL		 3072 void *data = xdp->data + offset;
3073
de8f3a83 3074 if (unlikely(data < data_start ||
17bedab2
MKL		 3075 data > xdp->data_end - ETH_HLEN))
3076 return -EINVAL;
3077
de8f3a83
DB		 3078 if (metalen)
3079 memmove(xdp->data_meta + offset,
3080 xdp->data_meta, metalen);
3081 xdp->data_meta += offset;
17bedab2
MKL		 3082 xdp->data = data;
3083
3084 return 0;
3085}
3086
3087static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
3088 .func = bpf_xdp_adjust_head,
3089 .gpl_only = false,
3090 .ret_type = RET_INTEGER,
3091 .arg1_type = ARG_PTR_TO_CTX,
3092 .arg2_type = ARG_ANYTHING,
3093};
3094
b32cc5b9
NS		 3095BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
3096{
3097 void *data_end = xdp->data_end + offset;
3098
3099 /* only shrinking is allowed for now. */
3100 if (unlikely(offset >= 0))
3101 return -EINVAL;
3102
3103 if (unlikely(data_end < xdp->data + ETH_HLEN))
3104 return -EINVAL;
3105
3106 xdp->data_end = data_end;
3107
3108 return 0;
3109}
3110
3111static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
3112 .func = bpf_xdp_adjust_tail,
3113 .gpl_only = false,
3114 .ret_type = RET_INTEGER,
3115 .arg1_type = ARG_PTR_TO_CTX,
3116 .arg2_type = ARG_ANYTHING,
3117};
3118
de8f3a83
DB		 3119BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
3120{
97e19cce 3121 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
de8f3a83
DB		 3122 void *meta = xdp->data_meta + offset;
3123 unsigned long metalen = xdp->data - meta;
3124
3125 if (xdp_data_meta_unsupported(xdp))
3126 return -ENOTSUPP;
97e19cce 3127 if (unlikely(meta < xdp_frame_end ||
de8f3a83
DB		 3128 meta > xdp->data))
3129 return -EINVAL;
3130 if (unlikely((metalen & (sizeof(__u32) - 1)) ||
3131 (metalen > 32)))
3132 return -EACCES;
3133
3134 xdp->data_meta = meta;
3135
3136 return 0;
3137}
3138
3139static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
3140 .func = bpf_xdp_adjust_meta,
3141 .gpl_only = false,
3142 .ret_type = RET_INTEGER,
3143 .arg1_type = ARG_PTR_TO_CTX,
3144 .arg2_type = ARG_ANYTHING,
3145};
3146
11393cc9
JF		 3147static int __bpf_tx_xdp(struct net_device *dev,
3148 struct bpf_map *map,
3149 struct xdp_buff *xdp,
3150 u32 index)
814abfab 3151{
44fa2dbd 3152 struct xdp_frame *xdpf;
d8d7218a 3153 int err, sent;
11393cc9
JF		 3154
3155 if (!dev->netdev_ops->ndo_xdp_xmit) {
11393cc9 3156 return -EOPNOTSUPP;
814abfab 3157 }
11393cc9 3158
d8d7218a
TM		 3159 err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data);
3160 if (unlikely(err))
3161 return err;
3162
44fa2dbd
JDB		 3163 xdpf = convert_to_xdp_frame(xdp);
3164 if (unlikely(!xdpf))
3165 return -EOVERFLOW;
3166
1e67575a 3167 sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH);
735fc405
JDB		 3168 if (sent <= 0)
3169 return sent;
9c270af3
JDB		 3170 return 0;
3171}
3172
3173static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
3174 struct bpf_map *map,
3175 struct xdp_buff *xdp,
3176 u32 index)
3177{
3178 int err;
3179
1b1a251c
BT		 3180 switch (map->map_type) {
3181 case BPF_MAP_TYPE_DEVMAP: {
67f29e07 3182 struct bpf_dtab_netdev *dst = fwd;
9c270af3 3183
38edddb8 3184 err = dev_map_enqueue(dst, xdp, dev_rx);
9c270af3
JDB		 3185 if (err)
3186 return err;
11393cc9 3187 __dev_map_insert_ctx(map, index);
1b1a251c
BT		 3188 break;
3189 }
3190 case BPF_MAP_TYPE_CPUMAP: {
9c270af3
JDB		 3191 struct bpf_cpu_map_entry *rcpu = fwd;
3192
3193 err = cpu_map_enqueue(rcpu, xdp, dev_rx);
3194 if (err)
3195 return err;
3196 __cpu_map_insert_ctx(map, index);
1b1a251c
BT		 3197 break;
3198 }
3199 case BPF_MAP_TYPE_XSKMAP: {
3200 struct xdp_sock *xs = fwd;
3201
3202 err = __xsk_map_redirect(map, xdp, xs);
3203 return err;
3204 }
3205 default:
3206 break;
9c270af3 3207 }
e4a8e817 3208 return 0;
814abfab
JF		 3209}
3210
11393cc9
JF		 3211void xdp_do_flush_map(void)
3212{
0b19cc0a 3213 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
11393cc9
JF		 3214 struct bpf_map *map = ri->map_to_flush;
3215
11393cc9 3216 ri->map_to_flush = NULL;
9c270af3
JDB		 3217 if (map) {
3218 switch (map->map_type) {
3219 case BPF_MAP_TYPE_DEVMAP:
3220 __dev_map_flush(map);
3221 break;
3222 case BPF_MAP_TYPE_CPUMAP:
3223 __cpu_map_flush(map);
3224 break;
1b1a251c
BT		 3225 case BPF_MAP_TYPE_XSKMAP:
3226 __xsk_map_flush(map);
3227 break;
9c270af3
JDB		 3228 default:
3229 break;
3230 }
3231 }
11393cc9
JF		 3232}
3233EXPORT_SYMBOL_GPL(xdp_do_flush_map);
3234
9c270af3
JDB		 3235static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
3236{
3237 switch (map->map_type) {
3238 case BPF_MAP_TYPE_DEVMAP:
3239 return __dev_map_lookup_elem(map, index);
3240 case BPF_MAP_TYPE_CPUMAP:
3241 return __cpu_map_lookup_elem(map, index);
1b1a251c
BT		 3242 case BPF_MAP_TYPE_XSKMAP:
3243 return __xsk_map_lookup_elem(map, index);
9c270af3
JDB		 3244 default:
3245 return NULL;
3246 }
3247}
3248
f6069b9a 3249void bpf_clear_redirect_map(struct bpf_map *map)
7c300131 3250{
f6069b9a
DB		 3251 struct bpf_redirect_info *ri;
3252 int cpu;
3253
3254 for_each_possible_cpu(cpu) {
3255 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
3256 /* Avoid polluting remote cacheline due to writes if
3257 * not needed. Once we pass this test, we need the
3258 * cmpxchg() to make sure it hasn't been changed in
3259 * the meantime by remote CPU.
3260 */
3261 if (unlikely(READ_ONCE(ri->map) == map))
3262 cmpxchg(&ri->map, map, NULL);
3263 }
7c300131
DB		 3264}
3265
e4a8e817 3266static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
f6069b9a 3267 struct bpf_prog *xdp_prog, struct bpf_map *map)
97f91a7c 3268{
0b19cc0a 3269 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
11393cc9 3270 u32 index = ri->ifindex;
9c270af3 3271 void *fwd = NULL;
4c03bdd7 3272 int err;
97f91a7c
JF		 3273
3274 ri->ifindex = 0;
f6069b9a 3275 WRITE_ONCE(ri->map, NULL);
97f91a7c 3276
9c270af3 3277 fwd = __xdp_map_lookup_elem(map, index);
4c03bdd7
JDB		 3278 if (!fwd) {
3279 err = -EINVAL;
f5836ca5 3280 goto err;
4c03bdd7 3281 }
e4a8e817 3282 if (ri->map_to_flush && ri->map_to_flush != map)
11393cc9
JF		 3283 xdp_do_flush_map();
3284
9c270af3 3285 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index);
f5836ca5
JDB		 3286 if (unlikely(err))
3287 goto err;
3288
3289 ri->map_to_flush = map;
59a30896 3290 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
f5836ca5
JDB		 3291 return 0;
3292err:
59a30896 3293 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
97f91a7c
JF		 3294 return err;
3295}
3296
5acaee0a
JF		 3297int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
3298 struct bpf_prog *xdp_prog)
814abfab 3299{
0b19cc0a 3300 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
f6069b9a 3301 struct bpf_map *map = READ_ONCE(ri->map);
5acaee0a 3302 struct net_device *fwd;
eb48d682 3303 u32 index = ri->ifindex;
4c03bdd7 3304 int err;
814abfab 3305
f6069b9a
DB		 3306 if (map)
3307 return xdp_do_redirect_map(dev, xdp, xdp_prog, map);
97f91a7c 3308
eb48d682 3309 fwd = dev_get_by_index_rcu(dev_net(dev), index);
814abfab 3310 ri->ifindex = 0;
5acaee0a 3311 if (unlikely(!fwd)) {
4c03bdd7 3312 err = -EINVAL;
f5836ca5 3313 goto err;
814abfab
JF		 3314 }
3315
4c03bdd7 3316 err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
f5836ca5
JDB		 3317 if (unlikely(err))
3318 goto err;
3319
3320 _trace_xdp_redirect(dev, xdp_prog, index);
3321 return 0;
3322err:
3323 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
4c03bdd7 3324 return err;
814abfab
JF		 3325}
3326EXPORT_SYMBOL_GPL(xdp_do_redirect);
3327
c060bc61
XS		 3328static int xdp_do_generic_redirect_map(struct net_device *dev,
3329 struct sk_buff *skb,
02671e23 3330 struct xdp_buff *xdp,
f6069b9a
DB		 3331 struct bpf_prog *xdp_prog,
3332 struct bpf_map *map)
6103aa96 3333{
0b19cc0a 3334 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
eb48d682 3335 u32 index = ri->ifindex;
02671e23 3336 void *fwd = NULL;
2facaad6 3337 int err = 0;
6103aa96 3338
6103aa96 3339 ri->ifindex = 0;
f6069b9a 3340 WRITE_ONCE(ri->map, NULL);
96c5508e 3341
9c270af3 3342 fwd = __xdp_map_lookup_elem(map, index);
2facaad6
JDB		 3343 if (unlikely(!fwd)) {
3344 err = -EINVAL;
f5836ca5 3345 goto err;
6103aa96
JF		 3346 }
3347
9c270af3 3348 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
6d5fc195
TM		 3349 struct bpf_dtab_netdev *dst = fwd;
3350
3351 err = dev_map_generic_redirect(dst, skb, xdp_prog);
3352 if (unlikely(err))
9c270af3 3353 goto err;
02671e23
BT		 3354 } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
3355 struct xdp_sock *xs = fwd;
3356
3357 err = xsk_generic_rcv(xs, xdp);
3358 if (err)
3359 goto err;
3360 consume_skb(skb);
9c270af3
JDB		 3361 } else {
3362 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3363 err = -EBADRQC;
f5836ca5 3364 goto err;
2facaad6 3365 }
6103aa96 3366
9c270af3
JDB		 3367 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3368 return 0;
3369err:
3370 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3371 return err;
3372}
3373
3374int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
02671e23 3375 struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
9c270af3 3376{
0b19cc0a 3377 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
f6069b9a 3378 struct bpf_map *map = READ_ONCE(ri->map);
9c270af3
JDB		 3379 u32 index = ri->ifindex;
3380 struct net_device *fwd;
3381 int err = 0;
3382
f6069b9a
DB		 3383 if (map)
3384 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog,
3385 map);
9c270af3
JDB		 3386 ri->ifindex = 0;
3387 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3388 if (unlikely(!fwd)) {
3389 err = -EINVAL;
f5836ca5 3390 goto err;
2facaad6
JDB		 3391 }
3392
d8d7218a
TM		 3393 err = xdp_ok_fwd_dev(fwd, skb->len);
3394 if (unlikely(err))
9c270af3
JDB		 3395 goto err;
3396
2facaad6 3397 skb->dev = fwd;
9c270af3 3398 _trace_xdp_redirect(dev, xdp_prog, index);
02671e23 3399 generic_xdp_tx(skb, xdp_prog);
f5836ca5
JDB		 3400 return 0;
3401err:
9c270af3 3402 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2facaad6 3403 return err;
6103aa96
JF		 3404}
3405EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
3406
814abfab
JF		 3407BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
3408{
0b19cc0a 3409 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
814abfab
JF		 3410
3411 if (unlikely(flags))
3412 return XDP_ABORTED;
3413
3414 ri->ifindex = ifindex;
3415 ri->flags = flags;
f6069b9a 3416 WRITE_ONCE(ri->map, NULL);
e4a8e817 3417
814abfab
JF		 3418 return XDP_REDIRECT;
3419}
3420
3421static const struct bpf_func_proto bpf_xdp_redirect_proto = {
3422 .func = bpf_xdp_redirect,
3423 .gpl_only = false,
3424 .ret_type = RET_INTEGER,
3425 .arg1_type = ARG_ANYTHING,
3426 .arg2_type = ARG_ANYTHING,
3427};
3428
f6069b9a
DB		 3429BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
3430 u64, flags)
e4a8e817 3431{
0b19cc0a 3432 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
e4a8e817
DB		 3433
3434 if (unlikely(flags))
3435 return XDP_ABORTED;
3436
3437 ri->ifindex = ifindex;
3438 ri->flags = flags;
f6069b9a 3439 WRITE_ONCE(ri->map, map);
e4a8e817
DB		 3440
3441 return XDP_REDIRECT;
3442}
3443
3444static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
3445 .func = bpf_xdp_redirect_map,
3446 .gpl_only = false,
3447 .ret_type = RET_INTEGER,
3448 .arg1_type = ARG_CONST_MAP_PTR,
3449 .arg2_type = ARG_ANYTHING,
3450 .arg3_type = ARG_ANYTHING,
3451};
3452
555c8a86 3453static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
aa7145c1 3454 unsigned long off, unsigned long len)
555c8a86 3455{
aa7145c1 3456 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
555c8a86
DB		 3457
3458 if (unlikely(!ptr))
3459 return len;
3460 if (ptr != dst_buff)
3461 memcpy(dst_buff, ptr, len);
3462
3463 return 0;
3464}
3465
f3694e00
DB		 3466BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
3467 u64, flags, void *, meta, u64, meta_size)
555c8a86 3468{
555c8a86 3469 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
555c8a86
DB		 3470
3471 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3472 return -EINVAL;
3473 if (unlikely(skb_size > skb->len))
3474 return -EFAULT;
3475
3476 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
3477 bpf_skb_copy);
3478}
3479
3480static const struct bpf_func_proto bpf_skb_event_output_proto = {
3481 .func = bpf_skb_event_output,
3482 .gpl_only = true,
3483 .ret_type = RET_INTEGER,
3484 .arg1_type = ARG_PTR_TO_CTX,
3485 .arg2_type = ARG_CONST_MAP_PTR,
3486 .arg3_type = ARG_ANYTHING,
39f19ebb 3487 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 3488 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
555c8a86
DB		 3489};
3490
c6c33454
DB		 3491static unsigned short bpf_tunnel_key_af(u64 flags)
3492{
3493 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
3494}
3495
f3694e00
DB		 3496BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
3497 u32, size, u64, flags)
d3aa45ce 3498{
c6c33454
DB		 3499 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
3500 u8 compat[sizeof(struct bpf_tunnel_key)];
074f528e
DB		 3501 void *to_orig = to;
3502 int err;
d3aa45ce 3503
074f528e
DB		 3504 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
3505 err = -EINVAL;
3506 goto err_clear;
3507 }
3508 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
3509 err = -EPROTO;
3510 goto err_clear;
3511 }
c6c33454 3512 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
074f528e 3513 err = -EINVAL;
c6c33454 3514 switch (size) {
4018ab18 3515 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 3516 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4018ab18 3517 goto set_compat;
c6c33454
DB		 3518 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3519 /* Fixup deprecated structure layouts here, so we have
3520 * a common path later on.
3521 */
3522 if (ip_tunnel_info_af(info) != AF_INET)
074f528e 3523 goto err_clear;
4018ab18 3524set_compat:
c6c33454
DB		 3525 to = (struct bpf_tunnel_key *)compat;
3526 break;
3527 default:
074f528e 3528 goto err_clear;
c6c33454
DB		 3529 }
3530 }
d3aa45ce
AS		 3531
3532 to->tunnel_id = be64_to_cpu(info->key.tun_id);
c6c33454
DB		 3533 to->tunnel_tos = info->key.tos;
3534 to->tunnel_ttl = info->key.ttl;
1fbc2e0c 3535 to->tunnel_ext = 0;
c6c33454 3536
4018ab18 3537 if (flags & BPF_F_TUNINFO_IPV6) {
c6c33454
DB		 3538 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
3539 sizeof(to->remote_ipv6));
4018ab18
DB		 3540 to->tunnel_label = be32_to_cpu(info->key.label);
3541 } else {
c6c33454 3542 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
1fbc2e0c
DB		 3543 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
3544 to->tunnel_label = 0;
4018ab18 3545 }
c6c33454
DB		 3546
3547 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
074f528e 3548 memcpy(to_orig, to, size);
d3aa45ce
AS		 3549
3550 return 0;
074f528e
DB		 3551err_clear:
3552 memset(to_orig, 0, size);
3553 return err;
d3aa45ce
AS		 3554}
3555
577c50aa 3556static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
d3aa45ce
AS		 3557 .func = bpf_skb_get_tunnel_key,
3558 .gpl_only = false,
3559 .ret_type = RET_INTEGER,
3560 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3561 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
3562 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 3563 .arg4_type = ARG_ANYTHING,
3564};
3565
f3694e00 3566BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
14ca0751 3567{
14ca0751 3568 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
074f528e 3569 int err;
14ca0751
DB		 3570
3571 if (unlikely(!info ||
074f528e
DB		 3572 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
3573 err = -ENOENT;
3574 goto err_clear;
3575 }
3576 if (unlikely(size < info->options_len)) {
3577 err = -ENOMEM;
3578 goto err_clear;
3579 }
14ca0751
DB		 3580
3581 ip_tunnel_info_opts_get(to, info);
074f528e
DB		 3582 if (size > info->options_len)
3583 memset(to + info->options_len, 0, size - info->options_len);
14ca0751
DB		 3584
3585 return info->options_len;
074f528e
DB		 3586err_clear:
3587 memset(to, 0, size);
3588 return err;
14ca0751
DB		 3589}
3590
3591static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
3592 .func = bpf_skb_get_tunnel_opt,
3593 .gpl_only = false,
3594 .ret_type = RET_INTEGER,
3595 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3596 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
3597 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 3598};
3599
d3aa45ce
AS		 3600static struct metadata_dst __percpu *md_dst;
3601
f3694e00
DB		 3602BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
3603 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
d3aa45ce 3604{
d3aa45ce 3605 struct metadata_dst *md = this_cpu_ptr(md_dst);
c6c33454 3606 u8 compat[sizeof(struct bpf_tunnel_key)];
d3aa45ce
AS		 3607 struct ip_tunnel_info *info;
3608
22080870 3609 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
77a5196a 3610 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
d3aa45ce 3611 return -EINVAL;
c6c33454
DB		 3612 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
3613 switch (size) {
4018ab18 3614 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 3615 case offsetof(struct bpf_tunnel_key, tunnel_ext):
c6c33454
DB		 3616 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3617 /* Fixup deprecated structure layouts here, so we have
3618 * a common path later on.
3619 */
3620 memcpy(compat, from, size);
3621 memset(compat + size, 0, sizeof(compat) - size);
f3694e00 3622 from = (const struct bpf_tunnel_key *) compat;
c6c33454
DB		 3623 break;
3624 default:
3625 return -EINVAL;
3626 }
3627 }
c0e760c9
DB		 3628 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3629 from->tunnel_ext))
4018ab18 3630 return -EINVAL;
d3aa45ce
AS		 3631
3632 skb_dst_drop(skb);
3633 dst_hold((struct dst_entry *) md);
3634 skb_dst_set(skb, (struct dst_entry *) md);
3635
3636 info = &md->u.tun_info;
5540fbf4 3637 memset(info, 0, sizeof(*info));
d3aa45ce 3638 info->mode = IP_TUNNEL_INFO_TX;
c6c33454 3639
db3c6139 3640 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
22080870
DB		 3641 if (flags & BPF_F_DONT_FRAGMENT)
3642 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
792f3dd6
WT		 3643 if (flags & BPF_F_ZERO_CSUM_TX)
3644 info->key.tun_flags &= ~TUNNEL_CSUM;
77a5196a
WT		 3645 if (flags & BPF_F_SEQ_NUMBER)
3646 info->key.tun_flags |= TUNNEL_SEQ;
22080870 3647
d3aa45ce 3648 info->key.tun_id = cpu_to_be64(from->tunnel_id);
c6c33454
DB		 3649 info->key.tos = from->tunnel_tos;
3650 info->key.ttl = from->tunnel_ttl;
3651
3652 if (flags & BPF_F_TUNINFO_IPV6) {
3653 info->mode |= IP_TUNNEL_INFO_IPV6;
3654 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3655 sizeof(from->remote_ipv6));
4018ab18
DB		 3656 info->key.label = cpu_to_be32(from->tunnel_label) &
3657 IPV6_FLOWLABEL_MASK;
c6c33454
DB		 3658 } else {
3659 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3660 }
d3aa45ce
AS		 3661
3662 return 0;
3663}
3664
577c50aa 3665static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
d3aa45ce
AS		 3666 .func = bpf_skb_set_tunnel_key,
3667 .gpl_only = false,
3668 .ret_type = RET_INTEGER,
3669 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3670 .arg2_type = ARG_PTR_TO_MEM,
3671 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 3672 .arg4_type = ARG_ANYTHING,
3673};
3674
f3694e00
DB		 3675BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3676 const u8 *, from, u32, size)
14ca0751 3677{
14ca0751
DB		 3678 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3679 const struct metadata_dst *md = this_cpu_ptr(md_dst);
3680
3681 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3682 return -EINVAL;
fca5fdf6 3683 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
14ca0751
DB		 3684 return -ENOMEM;
3685
256c87c1 3686 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
14ca0751
DB		 3687
3688 return 0;
3689}
3690
3691static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3692 .func = bpf_skb_set_tunnel_opt,
3693 .gpl_only = false,
3694 .ret_type = RET_INTEGER,
3695 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3696 .arg2_type = ARG_PTR_TO_MEM,
3697 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 3698};
3699
3700static const struct bpf_func_proto *
3701bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
d3aa45ce
AS		 3702{
3703 if (!md_dst) {
d66f2b91
JK		 3704 struct metadata_dst __percpu *tmp;
3705
3706 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3707 METADATA_IP_TUNNEL,
3708 GFP_KERNEL);
3709 if (!tmp)
d3aa45ce 3710 return NULL;
d66f2b91
JK		 3711 if (cmpxchg(&md_dst, NULL, tmp))
3712 metadata_dst_free_percpu(tmp);
d3aa45ce 3713 }
14ca0751
DB		 3714
3715 switch (which) {
3716 case BPF_FUNC_skb_set_tunnel_key:
3717 return &bpf_skb_set_tunnel_key_proto;
3718 case BPF_FUNC_skb_set_tunnel_opt:
3719 return &bpf_skb_set_tunnel_opt_proto;
3720 default:
3721 return NULL;
3722 }
d3aa45ce
AS		 3723}
3724
f3694e00
DB		 3725BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3726 u32, idx)
4a482f34 3727{
4a482f34
MKL		 3728 struct bpf_array *array = container_of(map, struct bpf_array, map);
3729 struct cgroup *cgrp;
3730 struct sock *sk;
4a482f34 3731
2d48c5f9 3732 sk = skb_to_full_sk(skb);
4a482f34
MKL		 3733 if (!sk || !sk_fullsock(sk))
3734 return -ENOENT;
f3694e00 3735 if (unlikely(idx >= array->map.max_entries))
4a482f34
MKL		 3736 return -E2BIG;
3737
f3694e00 3738 cgrp = READ_ONCE(array->ptrs[idx]);
4a482f34
MKL		 3739 if (unlikely(!cgrp))
3740 return -EAGAIN;
3741
54fd9c2d 3742 return sk_under_cgroup_hierarchy(sk, cgrp);
4a482f34
MKL		 3743}
3744
747ea55e
DB		 3745static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3746 .func = bpf_skb_under_cgroup,
4a482f34
MKL		 3747 .gpl_only = false,
3748 .ret_type = RET_INTEGER,
3749 .arg1_type = ARG_PTR_TO_CTX,
3750 .arg2_type = ARG_CONST_MAP_PTR,
3751 .arg3_type = ARG_ANYTHING,
3752};
4a482f34 3753
cb20b08e
DB		 3754#ifdef CONFIG_SOCK_CGROUP_DATA
3755BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
3756{
3757 struct sock *sk = skb_to_full_sk(skb);
3758 struct cgroup *cgrp;
3759
3760 if (!sk || !sk_fullsock(sk))
3761 return 0;
3762
3763 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
3764 return cgrp->kn->id.id;
3765}
3766
3767static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
3768 .func = bpf_skb_cgroup_id,
3769 .gpl_only = false,
3770 .ret_type = RET_INTEGER,
3771 .arg1_type = ARG_PTR_TO_CTX,
3772};
77236281
AI		 3773
3774BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
3775 ancestor_level)
3776{
3777 struct sock *sk = skb_to_full_sk(skb);
3778 struct cgroup *ancestor;
3779 struct cgroup *cgrp;
3780
3781 if (!sk || !sk_fullsock(sk))
3782 return 0;
3783
3784 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
3785 ancestor = cgroup_ancestor(cgrp, ancestor_level);
3786 if (!ancestor)
3787 return 0;
3788
3789 return ancestor->kn->id.id;
3790}
3791
3792static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
3793 .func = bpf_skb_ancestor_cgroup_id,
3794 .gpl_only = false,
3795 .ret_type = RET_INTEGER,
3796 .arg1_type = ARG_PTR_TO_CTX,
3797 .arg2_type = ARG_ANYTHING,
3798};
cb20b08e
DB		 3799#endif
3800
4de16969
DB		 3801static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
3802 unsigned long off, unsigned long len)
3803{
3804 memcpy(dst_buff, src_buff + off, len);
3805 return 0;
3806}
3807
f3694e00
DB		 3808BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
3809 u64, flags, void *, meta, u64, meta_size)
4de16969 3810{
4de16969 3811 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4de16969
DB		 3812
3813 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3814 return -EINVAL;
3815 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
3816 return -EFAULT;
3817
9c471370
MKL		 3818 return bpf_event_output(map, flags, meta, meta_size, xdp->data,
3819 xdp_size, bpf_xdp_copy);
4de16969
DB		 3820}
3821
3822static const struct bpf_func_proto bpf_xdp_event_output_proto = {
3823 .func = bpf_xdp_event_output,
3824 .gpl_only = true,
3825 .ret_type = RET_INTEGER,
3826 .arg1_type = ARG_PTR_TO_CTX,
3827 .arg2_type = ARG_CONST_MAP_PTR,
3828 .arg3_type = ARG_ANYTHING,
39f19ebb 3829 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 3830 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4de16969
DB		 3831};
3832
91b8270f
CF		 3833BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
3834{
3835 return skb->sk ? sock_gen_cookie(skb->sk) : 0;
3836}
3837
3838static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
3839 .func = bpf_get_socket_cookie,
3840 .gpl_only = false,
3841 .ret_type = RET_INTEGER,
3842 .arg1_type = ARG_PTR_TO_CTX,
3843};
3844
d692f113
AI		 3845BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
3846{
3847 return sock_gen_cookie(ctx->sk);
3848}
3849
3850static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
3851 .func = bpf_get_socket_cookie_sock_addr,
3852 .gpl_only = false,
3853 .ret_type = RET_INTEGER,
3854 .arg1_type = ARG_PTR_TO_CTX,
3855};
3856
3857BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
3858{
3859 return sock_gen_cookie(ctx->sk);
3860}
3861
3862static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
3863 .func = bpf_get_socket_cookie_sock_ops,
3864 .gpl_only = false,
3865 .ret_type = RET_INTEGER,
3866 .arg1_type = ARG_PTR_TO_CTX,
3867};
3868
6acc5c29
CF		 3869BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
3870{
3871 struct sock *sk = sk_to_full_sk(skb->sk);
3872 kuid_t kuid;
3873
3874 if (!sk || !sk_fullsock(sk))
3875 return overflowuid;
3876 kuid = sock_net_uid(sock_net(sk), sk);
3877 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
3878}
3879
3880static const struct bpf_func_proto bpf_get_socket_uid_proto = {
3881 .func = bpf_get_socket_uid,
3882 .gpl_only = false,
3883 .ret_type = RET_INTEGER,
3884 .arg1_type = ARG_PTR_TO_CTX,
3885};
3886
8c4b4c7e
LB		 3887BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3888 int, level, int, optname, char *, optval, int, optlen)
3889{
3890 struct sock *sk = bpf_sock->sk;
3891 int ret = 0;
3892 int val;
3893
3894 if (!sk_fullsock(sk))
3895 return -EINVAL;
3896
3897 if (level == SOL_SOCKET) {
3898 if (optlen != sizeof(int))
3899 return -EINVAL;
3900 val = *((int *)optval);
3901
3902 /* Only some socketops are supported */
3903 switch (optname) {
3904 case SO_RCVBUF:
3905 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
3906 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
3907 break;
3908 case SO_SNDBUF:
3909 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
3910 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
3911 break;
3912 case SO_MAX_PACING_RATE:
3913 sk->sk_max_pacing_rate = val;
3914 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
3915 sk->sk_max_pacing_rate);
3916 break;
3917 case SO_PRIORITY:
3918 sk->sk_priority = val;
3919 break;
3920 case SO_RCVLOWAT:
3921 if (val < 0)
3922 val = INT_MAX;
3923 sk->sk_rcvlowat = val ? : 1;
3924 break;
3925 case SO_MARK:
3926 sk->sk_mark = val;
3927 break;
3928 default:
3929 ret = -EINVAL;
3930 }
a5192c52 3931#ifdef CONFIG_INET
6f5c39fa
NS		 3932 } else if (level == SOL_IP) {
3933 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
3934 return -EINVAL;
3935
3936 val = *((int *)optval);
3937 /* Only some options are supported */
3938 switch (optname) {
3939 case IP_TOS:
3940 if (val < -1 || val > 0xff) {
3941 ret = -EINVAL;
3942 } else {
3943 struct inet_sock *inet = inet_sk(sk);
3944
3945 if (val == -1)
3946 val = 0;
3947 inet->tos = val;
3948 }
3949 break;
3950 default:
3951 ret = -EINVAL;
3952 }
6f9bd3d7
LB		 3953#if IS_ENABLED(CONFIG_IPV6)
3954 } else if (level == SOL_IPV6) {
3955 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
3956 return -EINVAL;
3957
3958 val = *((int *)optval);
3959 /* Only some options are supported */
3960 switch (optname) {
3961 case IPV6_TCLASS:
3962 if (val < -1 || val > 0xff) {
3963 ret = -EINVAL;
3964 } else {
3965 struct ipv6_pinfo *np = inet6_sk(sk);
3966
3967 if (val == -1)
3968 val = 0;
3969 np->tclass = val;
3970 }
3971 break;
3972 default:
3973 ret = -EINVAL;
3974 }
3975#endif
8c4b4c7e
LB		 3976 } else if (level == SOL_TCP &&
3977 sk->sk_prot->setsockopt == tcp_setsockopt) {
91b5b21c
LB		 3978 if (optname == TCP_CONGESTION) {
3979 char name[TCP_CA_NAME_MAX];
ebfa00c5 3980 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
91b5b21c
LB		 3981
3982 strncpy(name, optval, min_t(long, optlen,
3983 TCP_CA_NAME_MAX-1));
3984 name[TCP_CA_NAME_MAX-1] = 0;
6f9bd3d7
LB		 3985 ret = tcp_set_congestion_control(sk, name, false,
3986 reinit);
91b5b21c 3987 } else {
fc747810
LB		 3988 struct tcp_sock *tp = tcp_sk(sk);
3989
3990 if (optlen != sizeof(int))
3991 return -EINVAL;
3992
3993 val = *((int *)optval);
3994 /* Only some options are supported */
3995 switch (optname) {
3996 case TCP_BPF_IW:
3997 if (val <= 0 || tp->data_segs_out > 0)
3998 ret = -EINVAL;
3999 else
4000 tp->snd_cwnd = val;
4001 break;
13bf9641
LB		 4002 case TCP_BPF_SNDCWND_CLAMP:
4003 if (val <= 0) {
4004 ret = -EINVAL;
4005 } else {
4006 tp->snd_cwnd_clamp = val;
4007 tp->snd_ssthresh = val;
4008 }
6d3f06a0 4009 break;
fc747810
LB		 4010 default:
4011 ret = -EINVAL;
4012 }
91b5b21c 4013 }
91b5b21c 4014#endif
8c4b4c7e
LB		 4015 } else {
4016 ret = -EINVAL;
4017 }
4018 return ret;
4019}
4020
4021static const struct bpf_func_proto bpf_setsockopt_proto = {
4022 .func = bpf_setsockopt,
cd86d1fd 4023 .gpl_only = false,
8c4b4c7e
LB		 4024 .ret_type = RET_INTEGER,
4025 .arg1_type = ARG_PTR_TO_CTX,
4026 .arg2_type = ARG_ANYTHING,
4027 .arg3_type = ARG_ANYTHING,
4028 .arg4_type = ARG_PTR_TO_MEM,
4029 .arg5_type = ARG_CONST_SIZE,
4030};
4031
cd86d1fd
LB		 4032BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
4033 int, level, int, optname, char *, optval, int, optlen)
4034{
4035 struct sock *sk = bpf_sock->sk;
cd86d1fd
LB		 4036
4037 if (!sk_fullsock(sk))
4038 goto err_clear;
4039
4040#ifdef CONFIG_INET
4041 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
4042 if (optname == TCP_CONGESTION) {
4043 struct inet_connection_sock *icsk = inet_csk(sk);
4044
4045 if (!icsk->icsk_ca_ops || optlen <= 1)
4046 goto err_clear;
4047 strncpy(optval, icsk->icsk_ca_ops->name, optlen);
4048 optval[optlen - 1] = 0;
4049 } else {
4050 goto err_clear;
4051 }
6f5c39fa
NS		 4052 } else if (level == SOL_IP) {
4053 struct inet_sock *inet = inet_sk(sk);
4054
4055 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4056 goto err_clear;
4057
4058 /* Only some options are supported */
4059 switch (optname) {
4060 case IP_TOS:
4061 *((int *)optval) = (int)inet->tos;
4062 break;
4063 default:
4064 goto err_clear;
4065 }
6f9bd3d7
LB		 4066#if IS_ENABLED(CONFIG_IPV6)
4067 } else if (level == SOL_IPV6) {
4068 struct ipv6_pinfo *np = inet6_sk(sk);
4069
4070 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4071 goto err_clear;
4072
4073 /* Only some options are supported */
4074 switch (optname) {
4075 case IPV6_TCLASS:
4076 *((int *)optval) = (int)np->tclass;
4077 break;
4078 default:
4079 goto err_clear;
4080 }
4081#endif
cd86d1fd
LB		 4082 } else {
4083 goto err_clear;
4084 }
aa2bc739 4085 return 0;
cd86d1fd
LB		 4086#endif
4087err_clear:
4088 memset(optval, 0, optlen);
4089 return -EINVAL;
4090}
4091
4092static const struct bpf_func_proto bpf_getsockopt_proto = {
4093 .func = bpf_getsockopt,
4094 .gpl_only = false,
4095 .ret_type = RET_INTEGER,
4096 .arg1_type = ARG_PTR_TO_CTX,
4097 .arg2_type = ARG_ANYTHING,
4098 .arg3_type = ARG_ANYTHING,
4099 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
4100 .arg5_type = ARG_CONST_SIZE,
4101};
4102
b13d8807
LB		 4103BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
4104 int, argval)
4105{
4106 struct sock *sk = bpf_sock->sk;
4107 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
4108
a7dcdf6e 4109 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
b13d8807
LB		 4110 return -EINVAL;
4111
b13d8807
LB		 4112 if (val)
4113 tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
4114
4115 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
b13d8807
LB		 4116}
4117
4118static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
4119 .func = bpf_sock_ops_cb_flags_set,
4120 .gpl_only = false,
4121 .ret_type = RET_INTEGER,
4122 .arg1_type = ARG_PTR_TO_CTX,
4123 .arg2_type = ARG_ANYTHING,
4124};
4125
d74bad4e
AI		 4126const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
4127EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
4128
4129BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
4130 int, addr_len)
4131{
4132#ifdef CONFIG_INET
4133 struct sock *sk = ctx->sk;
4134 int err;
4135
4136 /* Binding to port can be expensive so it's prohibited in the helper.
4137 * Only binding to IP is supported.
4138 */
4139 err = -EINVAL;
4140 if (addr->sa_family == AF_INET) {
4141 if (addr_len < sizeof(struct sockaddr_in))
4142 return err;
4143 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
4144 return err;
4145 return __inet_bind(sk, addr, addr_len, true, false);
4146#if IS_ENABLED(CONFIG_IPV6)
4147 } else if (addr->sa_family == AF_INET6) {
4148 if (addr_len < SIN6_LEN_RFC2133)
4149 return err;
4150 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
4151 return err;
4152 /* ipv6_bpf_stub cannot be NULL, since it's called from
4153 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
4154 */
4155 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false);
4156#endif /* CONFIG_IPV6 */
4157 }
4158#endif /* CONFIG_INET */
4159
4160 return -EAFNOSUPPORT;
4161}
4162
4163static const struct bpf_func_proto bpf_bind_proto = {
4164 .func = bpf_bind,
4165 .gpl_only = false,
4166 .ret_type = RET_INTEGER,
4167 .arg1_type = ARG_PTR_TO_CTX,
4168 .arg2_type = ARG_PTR_TO_MEM,
4169 .arg3_type = ARG_CONST_SIZE,
4170};
4171
12bed760
EB		 4172#ifdef CONFIG_XFRM
4173BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
4174 struct bpf_xfrm_state *, to, u32, size, u64, flags)
4175{
4176 const struct sec_path *sp = skb_sec_path(skb);
4177 const struct xfrm_state *x;
4178
4179 if (!sp || unlikely(index >= sp->len || flags))
4180 goto err_clear;
4181
4182 x = sp->xvec[index];
4183
4184 if (unlikely(size != sizeof(struct bpf_xfrm_state)))
4185 goto err_clear;
4186
4187 to->reqid = x->props.reqid;
4188 to->spi = x->id.spi;
4189 to->family = x->props.family;
1fbc2e0c
DB		 4190 to->ext = 0;
4191
12bed760
EB		 4192 if (to->family == AF_INET6) {
4193 memcpy(to->remote_ipv6, x->props.saddr.a6,
4194 sizeof(to->remote_ipv6));
4195 } else {
4196 to->remote_ipv4 = x->props.saddr.a4;
1fbc2e0c 4197 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
12bed760
EB		 4198 }
4199
4200 return 0;
4201err_clear:
4202 memset(to, 0, size);
4203 return -EINVAL;
4204}
4205
4206static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
4207 .func = bpf_skb_get_xfrm_state,
4208 .gpl_only = false,
4209 .ret_type = RET_INTEGER,
4210 .arg1_type = ARG_PTR_TO_CTX,
4211 .arg2_type = ARG_ANYTHING,
4212 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
4213 .arg4_type = ARG_CONST_SIZE,
4214 .arg5_type = ARG_ANYTHING,
4215};
4216#endif
4217
87f5fc7e
DA		 4218#if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
4219static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
4220 const struct neighbour *neigh,
4221 const struct net_device *dev)
4222{
4223 memcpy(params->dmac, neigh->ha, ETH_ALEN);
4224 memcpy(params->smac, dev->dev_addr, ETH_ALEN);
4225 params->h_vlan_TCI = 0;
4226 params->h_vlan_proto = 0;
4c79579b 4227 params->ifindex = dev->ifindex;
87f5fc7e 4228
4c79579b 4229 return 0;
87f5fc7e
DA		 4230}
4231#endif
4232
4233#if IS_ENABLED(CONFIG_INET)
4234static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4f74fede 4235 u32 flags, bool check_mtu)
87f5fc7e
DA		 4236{
4237 struct in_device *in_dev;
4238 struct neighbour *neigh;
4239 struct net_device *dev;
4240 struct fib_result res;
4241 struct fib_nh *nh;
4242 struct flowi4 fl4;
4243 int err;
4f74fede 4244 u32 mtu;
87f5fc7e
DA		 4245
4246 dev = dev_get_by_index_rcu(net, params->ifindex);
4247 if (unlikely(!dev))
4248 return -ENODEV;
4249
4250 /* verify forwarding is enabled on this interface */
4251 in_dev = __in_dev_get_rcu(dev);
4252 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
4c79579b 4253 return BPF_FIB_LKUP_RET_FWD_DISABLED;
87f5fc7e
DA		 4254
4255 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4256 fl4.flowi4_iif = 1;
4257 fl4.flowi4_oif = params->ifindex;
4258 } else {
4259 fl4.flowi4_iif = params->ifindex;
4260 fl4.flowi4_oif = 0;
4261 }
4262 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
4263 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
4264 fl4.flowi4_flags = 0;
4265
4266 fl4.flowi4_proto = params->l4_protocol;
4267 fl4.daddr = params->ipv4_dst;
4268 fl4.saddr = params->ipv4_src;
4269 fl4.fl4_sport = params->sport;
4270 fl4.fl4_dport = params->dport;
4271
4272 if (flags & BPF_FIB_LOOKUP_DIRECT) {
4273 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4274 struct fib_table *tb;
4275
4276 tb = fib_get_table(net, tbid);
4277 if (unlikely(!tb))
4c79579b 4278 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4279
4280 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
4281 } else {
4282 fl4.flowi4_mark = 0;
4283 fl4.flowi4_secid = 0;
4284 fl4.flowi4_tun_key.tun_id = 0;
4285 fl4.flowi4_uid = sock_net_uid(net, NULL);
4286
4287 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
4288 }
4289
4c79579b
DA		 4290 if (err) {
4291 /* map fib lookup errors to RTN_ type */
4292 if (err == -EINVAL)
4293 return BPF_FIB_LKUP_RET_BLACKHOLE;
4294 if (err == -EHOSTUNREACH)
4295 return BPF_FIB_LKUP_RET_UNREACHABLE;
4296 if (err == -EACCES)
4297 return BPF_FIB_LKUP_RET_PROHIBIT;
4298
4299 return BPF_FIB_LKUP_RET_NOT_FWDED;
4300 }
4301
4302 if (res.type != RTN_UNICAST)
4303 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4304
4305 if (res.fi->fib_nhs > 1)
4306 fib_select_path(net, &res, &fl4, NULL);
4307
4f74fede
DA		 4308 if (check_mtu) {
4309 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
4310 if (params->tot_len > mtu)
4c79579b 4311 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4312 }
4313
87f5fc7e
DA		 4314 nh = &res.fi->fib_nh[res.nh_sel];
4315
4316 /* do not handle lwt encaps right now */
4317 if (nh->nh_lwtstate)
4c79579b 4318 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
87f5fc7e
DA		 4319
4320 dev = nh->nh_dev;
87f5fc7e
DA		 4321 if (nh->nh_gw)
4322 params->ipv4_dst = nh->nh_gw;
4323
4324 params->rt_metric = res.fi->fib_priority;
4325
4326 /* xdp and cls_bpf programs are run in RCU-bh so
4327 * rcu_read_lock_bh is not needed here
4328 */
4329 neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)params->ipv4_dst);
4c79579b
DA		 4330 if (!neigh)
4331 return BPF_FIB_LKUP_RET_NO_NEIGH;
87f5fc7e 4332
4c79579b 4333 return bpf_fib_set_fwd_params(params, neigh, dev);
87f5fc7e
DA		 4334}
4335#endif
4336
4337#if IS_ENABLED(CONFIG_IPV6)
4338static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4f74fede 4339 u32 flags, bool check_mtu)
87f5fc7e
DA		 4340{
4341 struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
4342 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
4343 struct neighbour *neigh;
4344 struct net_device *dev;
4345 struct inet6_dev *idev;
4346 struct fib6_info *f6i;
4347 struct flowi6 fl6;
4348 int strict = 0;
4349 int oif;
4f74fede 4350 u32 mtu;
87f5fc7e
DA		 4351
4352 /* link local addresses are never forwarded */
4353 if (rt6_need_strict(dst) || rt6_need_strict(src))
4c79579b 4354 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4355
4356 dev = dev_get_by_index_rcu(net, params->ifindex);
4357 if (unlikely(!dev))
4358 return -ENODEV;
4359
4360 idev = __in6_dev_get_safely(dev);
4361 if (unlikely(!idev || !net->ipv6.devconf_all->forwarding))
4c79579b 4362 return BPF_FIB_LKUP_RET_FWD_DISABLED;
87f5fc7e
DA		 4363
4364 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4365 fl6.flowi6_iif = 1;
4366 oif = fl6.flowi6_oif = params->ifindex;
4367 } else {
4368 oif = fl6.flowi6_iif = params->ifindex;
4369 fl6.flowi6_oif = 0;
4370 strict = RT6_LOOKUP_F_HAS_SADDR;
4371 }
bd3a08aa 4372 fl6.flowlabel = params->flowinfo;
87f5fc7e
DA		 4373 fl6.flowi6_scope = 0;
4374 fl6.flowi6_flags = 0;
4375 fl6.mp_hash = 0;
4376
4377 fl6.flowi6_proto = params->l4_protocol;
4378 fl6.daddr = *dst;
4379 fl6.saddr = *src;
4380 fl6.fl6_sport = params->sport;
4381 fl6.fl6_dport = params->dport;
4382
4383 if (flags & BPF_FIB_LOOKUP_DIRECT) {
4384 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4385 struct fib6_table *tb;
4386
4387 tb = ipv6_stub->fib6_get_table(net, tbid);
4388 if (unlikely(!tb))
4c79579b 4389 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4390
4391 f6i = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, strict);
4392 } else {
4393 fl6.flowi6_mark = 0;
4394 fl6.flowi6_secid = 0;
4395 fl6.flowi6_tun_key.tun_id = 0;
4396 fl6.flowi6_uid = sock_net_uid(net, NULL);
4397
4398 f6i = ipv6_stub->fib6_lookup(net, oif, &fl6, strict);
4399 }
4400
4401 if (unlikely(IS_ERR_OR_NULL(f6i) || f6i == net->ipv6.fib6_null_entry))
4c79579b
DA		 4402 return BPF_FIB_LKUP_RET_NOT_FWDED;
4403
4404 if (unlikely(f6i->fib6_flags & RTF_REJECT)) {
4405 switch (f6i->fib6_type) {
4406 case RTN_BLACKHOLE:
4407 return BPF_FIB_LKUP_RET_BLACKHOLE;
4408 case RTN_UNREACHABLE:
4409 return BPF_FIB_LKUP_RET_UNREACHABLE;
4410 case RTN_PROHIBIT:
4411 return BPF_FIB_LKUP_RET_PROHIBIT;
4412 default:
4413 return BPF_FIB_LKUP_RET_NOT_FWDED;
4414 }
4415 }
87f5fc7e 4416
4c79579b
DA		 4417 if (f6i->fib6_type != RTN_UNICAST)
4418 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4419
4420 if (f6i->fib6_nsiblings && fl6.flowi6_oif == 0)
4421 f6i = ipv6_stub->fib6_multipath_select(net, f6i, &fl6,
4422 fl6.flowi6_oif, NULL,
4423 strict);
4424
4f74fede
DA		 4425 if (check_mtu) {
4426 mtu = ipv6_stub->ip6_mtu_from_fib6(f6i, dst, src);
4427 if (params->tot_len > mtu)
4c79579b 4428 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4429 }
4430
87f5fc7e 4431 if (f6i->fib6_nh.nh_lwtstate)
4c79579b 4432 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
87f5fc7e
DA		 4433
4434 if (f6i->fib6_flags & RTF_GATEWAY)
4435 *dst = f6i->fib6_nh.nh_gw;
4436
4437 dev = f6i->fib6_nh.nh_dev;
4438 params->rt_metric = f6i->fib6_metric;
4439
4440 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
4441 * not needed here. Can not use __ipv6_neigh_lookup_noref here
4442 * because we need to get nd_tbl via the stub
4443 */
4444 neigh = ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128,
4445 ndisc_hashfn, dst, dev);
4c79579b
DA		 4446 if (!neigh)
4447 return BPF_FIB_LKUP_RET_NO_NEIGH;
87f5fc7e 4448
4c79579b 4449 return bpf_fib_set_fwd_params(params, neigh, dev);
87f5fc7e
DA		 4450}
4451#endif
4452
4453BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
4454 struct bpf_fib_lookup *, params, int, plen, u32, flags)
4455{
4456 if (plen < sizeof(*params))
4457 return -EINVAL;
4458
9ce64f19
DA		 4459 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4460 return -EINVAL;
4461
87f5fc7e
DA		 4462 switch (params->family) {
4463#if IS_ENABLED(CONFIG_INET)
4464 case AF_INET:
4465 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
4f74fede 4466 flags, true);
87f5fc7e
DA		 4467#endif
4468#if IS_ENABLED(CONFIG_IPV6)
4469 case AF_INET6:
4470 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
4f74fede 4471 flags, true);
87f5fc7e
DA		 4472#endif
4473 }
bcece5dc 4474 return -EAFNOSUPPORT;
87f5fc7e
DA		 4475}
4476
4477static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
4478 .func = bpf_xdp_fib_lookup,
4479 .gpl_only = true,
4480 .ret_type = RET_INTEGER,
4481 .arg1_type = ARG_PTR_TO_CTX,
4482 .arg2_type = ARG_PTR_TO_MEM,
4483 .arg3_type = ARG_CONST_SIZE,
4484 .arg4_type = ARG_ANYTHING,
4485};
4486
4487BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
4488 struct bpf_fib_lookup *, params, int, plen, u32, flags)
4489{
4f74fede 4490 struct net *net = dev_net(skb->dev);
4c79579b 4491 int rc = -EAFNOSUPPORT;
4f74fede 4492
87f5fc7e
DA		 4493 if (plen < sizeof(*params))
4494 return -EINVAL;
4495
9ce64f19
DA		 4496 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4497 return -EINVAL;
4498
87f5fc7e
DA		 4499 switch (params->family) {
4500#if IS_ENABLED(CONFIG_INET)
4501 case AF_INET:
4c79579b 4502 rc = bpf_ipv4_fib_lookup(net, params, flags, false);
4f74fede 4503 break;
87f5fc7e
DA		 4504#endif
4505#if IS_ENABLED(CONFIG_IPV6)
4506 case AF_INET6:
4c79579b 4507 rc = bpf_ipv6_fib_lookup(net, params, flags, false);
4f74fede 4508 break;
87f5fc7e
DA		 4509#endif
4510 }
4f74fede 4511
4c79579b 4512 if (!rc) {
4f74fede
DA		 4513 struct net_device *dev;
4514
4c79579b 4515 dev = dev_get_by_index_rcu(net, params->ifindex);
4f74fede 4516 if (!is_skb_forwardable(dev, skb))
4c79579b 4517 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4518 }
4519
4c79579b 4520 return rc;
87f5fc7e
DA		 4521}
4522
4523static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
4524 .func = bpf_skb_fib_lookup,
4525 .gpl_only = true,
4526 .ret_type = RET_INTEGER,
4527 .arg1_type = ARG_PTR_TO_CTX,
4528 .arg2_type = ARG_PTR_TO_MEM,
4529 .arg3_type = ARG_CONST_SIZE,
4530 .arg4_type = ARG_ANYTHING,
4531};
4532
fe94cc29
MX		 4533#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4534static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
4535{
4536 int err;
4537 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
4538
4539 if (!seg6_validate_srh(srh, len))
4540 return -EINVAL;
4541
4542 switch (type) {
4543 case BPF_LWT_ENCAP_SEG6_INLINE:
4544 if (skb->protocol != htons(ETH_P_IPV6))
4545 return -EBADMSG;
4546
4547 err = seg6_do_srh_inline(skb, srh);
4548 break;
4549 case BPF_LWT_ENCAP_SEG6:
4550 skb_reset_inner_headers(skb);
4551 skb->encapsulation = 1;
4552 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
4553 break;
4554 default:
4555 return -EINVAL;
4556 }
4557
4558 bpf_compute_data_pointers(skb);
4559 if (err)
4560 return err;
4561
4562 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
4563 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
4564
4565 return seg6_lookup_nexthop(skb, NULL, 0);
4566}
4567#endif /* CONFIG_IPV6_SEG6_BPF */
4568
4569BPF_CALL_4(bpf_lwt_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
4570 u32, len)
4571{
4572 switch (type) {
4573#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4574 case BPF_LWT_ENCAP_SEG6:
4575 case BPF_LWT_ENCAP_SEG6_INLINE:
4576 return bpf_push_seg6_encap(skb, type, hdr, len);
4577#endif
4578 default:
4579 return -EINVAL;
4580 }
4581}
4582
4583static const struct bpf_func_proto bpf_lwt_push_encap_proto = {
4584 .func = bpf_lwt_push_encap,
4585 .gpl_only = false,
4586 .ret_type = RET_INTEGER,
4587 .arg1_type = ARG_PTR_TO_CTX,
4588 .arg2_type = ARG_ANYTHING,
4589 .arg3_type = ARG_PTR_TO_MEM,
4590 .arg4_type = ARG_CONST_SIZE
4591};
4592
61d76980 4593#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
fe94cc29
MX		 4594BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
4595 const void *, from, u32, len)
4596{
fe94cc29
MX		 4597 struct seg6_bpf_srh_state *srh_state =
4598 this_cpu_ptr(&seg6_bpf_srh_states);
486cdf21 4599 struct ipv6_sr_hdr *srh = srh_state->srh;
fe94cc29 4600 void *srh_tlvs, *srh_end, *ptr;
fe94cc29
MX		 4601 int srhoff = 0;
4602
486cdf21 4603 if (srh == NULL)
fe94cc29
MX		 4604 return -EINVAL;
4605
fe94cc29
MX		 4606 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
4607 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
4608
4609 ptr = skb->data + offset;
4610 if (ptr >= srh_tlvs && ptr + len <= srh_end)
486cdf21 4611 srh_state->valid = false;
fe94cc29
MX		 4612 else if (ptr < (void *)&srh->flags ||
4613 ptr + len > (void *)&srh->segments)
4614 return -EFAULT;
4615
4616 if (unlikely(bpf_try_make_writable(skb, offset + len)))
4617 return -EFAULT;
486cdf21
MX		 4618 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
4619 return -EINVAL;
4620 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
fe94cc29
MX		 4621
4622 memcpy(skb->data + offset, from, len);
4623 return 0;
fe94cc29
MX		 4624}
4625
4626static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
4627 .func = bpf_lwt_seg6_store_bytes,
4628 .gpl_only = false,
4629 .ret_type = RET_INTEGER,
4630 .arg1_type = ARG_PTR_TO_CTX,
4631 .arg2_type = ARG_ANYTHING,
4632 .arg3_type = ARG_PTR_TO_MEM,
4633 .arg4_type = ARG_CONST_SIZE
4634};
4635
486cdf21 4636static void bpf_update_srh_state(struct sk_buff *skb)
fe94cc29 4637{
fe94cc29
MX		 4638 struct seg6_bpf_srh_state *srh_state =
4639 this_cpu_ptr(&seg6_bpf_srh_states);
fe94cc29 4640 int srhoff = 0;
fe94cc29 4641
486cdf21
MX		 4642 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
4643 srh_state->srh = NULL;
4644 } else {
4645 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
4646 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
4647 srh_state->valid = true;
fe94cc29 4648 }
486cdf21
MX		 4649}
4650
4651BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
4652 u32, action, void *, param, u32, param_len)
4653{
4654 struct seg6_bpf_srh_state *srh_state =
4655 this_cpu_ptr(&seg6_bpf_srh_states);
4656 int hdroff = 0;
4657 int err;
fe94cc29
MX		 4658
4659 switch (action) {
4660 case SEG6_LOCAL_ACTION_END_X:
486cdf21
MX		 4661 if (!seg6_bpf_has_valid_srh(skb))
4662 return -EBADMSG;
fe94cc29
MX		 4663 if (param_len != sizeof(struct in6_addr))
4664 return -EINVAL;
4665 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
4666 case SEG6_LOCAL_ACTION_END_T:
486cdf21
MX		 4667 if (!seg6_bpf_has_valid_srh(skb))
4668 return -EBADMSG;
fe94cc29
MX		 4669 if (param_len != sizeof(int))
4670 return -EINVAL;
4671 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
486cdf21
MX		 4672 case SEG6_LOCAL_ACTION_END_DT6:
4673 if (!seg6_bpf_has_valid_srh(skb))
4674 return -EBADMSG;
fe94cc29
MX		 4675 if (param_len != sizeof(int))
4676 return -EINVAL;
486cdf21
MX		 4677
4678 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
4679 return -EBADMSG;
4680 if (!pskb_pull(skb, hdroff))
4681 return -EBADMSG;
4682
4683 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
4684 skb_reset_network_header(skb);
4685 skb_reset_transport_header(skb);
4686 skb->encapsulation = 0;
4687
4688 bpf_compute_data_pointers(skb);
4689 bpf_update_srh_state(skb);
fe94cc29
MX		 4690 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
4691 case SEG6_LOCAL_ACTION_END_B6:
486cdf21
MX		 4692 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
4693 return -EBADMSG;
fe94cc29
MX		 4694 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
4695 param, param_len);
4696 if (!err)
486cdf21
MX		 4697 bpf_update_srh_state(skb);
4698
fe94cc29
MX		 4699 return err;
4700 case SEG6_LOCAL_ACTION_END_B6_ENCAP:
486cdf21
MX		 4701 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
4702 return -EBADMSG;
fe94cc29
MX		 4703 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
4704 param, param_len);
4705 if (!err)
486cdf21
MX		 4706 bpf_update_srh_state(skb);
4707
fe94cc29
MX		 4708 return err;
4709 default:
4710 return -EINVAL;
4711 }
fe94cc29
MX		 4712}
4713
4714static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
4715 .func = bpf_lwt_seg6_action,
4716 .gpl_only = false,
4717 .ret_type = RET_INTEGER,
4718 .arg1_type = ARG_PTR_TO_CTX,
4719 .arg2_type = ARG_ANYTHING,
4720 .arg3_type = ARG_PTR_TO_MEM,
4721 .arg4_type = ARG_CONST_SIZE
4722};
4723
4724BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
4725 s32, len)
4726{
fe94cc29
MX		 4727 struct seg6_bpf_srh_state *srh_state =
4728 this_cpu_ptr(&seg6_bpf_srh_states);
486cdf21 4729 struct ipv6_sr_hdr *srh = srh_state->srh;
fe94cc29 4730 void *srh_end, *srh_tlvs, *ptr;
fe94cc29
MX		 4731 struct ipv6hdr *hdr;
4732 int srhoff = 0;
4733 int ret;
4734
486cdf21 4735 if (unlikely(srh == NULL))
fe94cc29 4736 return -EINVAL;
fe94cc29
MX		 4737
4738 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
4739 ((srh->first_segment + 1) << 4));
4740 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
4741 srh_state->hdrlen);
4742 ptr = skb->data + offset;
4743
4744 if (unlikely(ptr < srh_tlvs || ptr > srh_end))
4745 return -EFAULT;
4746 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
4747 return -EFAULT;
4748
4749 if (len > 0) {
4750 ret = skb_cow_head(skb, len);
4751 if (unlikely(ret < 0))
4752 return ret;
4753
4754 ret = bpf_skb_net_hdr_push(skb, offset, len);
4755 } else {
4756 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
4757 }
4758
4759 bpf_compute_data_pointers(skb);
4760 if (unlikely(ret < 0))
4761 return ret;
4762
4763 hdr = (struct ipv6hdr *)skb->data;
4764 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
4765
486cdf21
MX		 4766 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
4767 return -EINVAL;
4768 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
fe94cc29 4769 srh_state->hdrlen += len;
486cdf21 4770 srh_state->valid = false;
fe94cc29 4771 return 0;
fe94cc29
MX		 4772}
4773
4774static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
4775 .func = bpf_lwt_seg6_adjust_srh,
4776 .gpl_only = false,
4777 .ret_type = RET_INTEGER,
4778 .arg1_type = ARG_PTR_TO_CTX,
4779 .arg2_type = ARG_ANYTHING,
4780 .arg3_type = ARG_ANYTHING,
4781};
61d76980 4782#endif /* CONFIG_IPV6_SEG6_BPF */
fe94cc29
MX		 4783
4784bool bpf_helper_changes_pkt_data(void *func)
4785{
4786 if (func == bpf_skb_vlan_push ||
4787 func == bpf_skb_vlan_pop ||
4788 func == bpf_skb_store_bytes ||
4789 func == bpf_skb_change_proto ||
4790 func == bpf_skb_change_head ||
0ea488ff 4791 func == sk_skb_change_head ||
fe94cc29 4792 func == bpf_skb_change_tail ||
0ea488ff 4793 func == sk_skb_change_tail ||
fe94cc29
MX		 4794 func == bpf_skb_adjust_room ||
4795 func == bpf_skb_pull_data ||
0ea488ff 4796 func == sk_skb_pull_data ||
fe94cc29
MX		 4797 func == bpf_clone_redirect ||
4798 func == bpf_l3_csum_replace ||
4799 func == bpf_l4_csum_replace ||
4800 func == bpf_xdp_adjust_head ||
4801 func == bpf_xdp_adjust_meta ||
4802 func == bpf_msg_pull_data ||
4803 func == bpf_xdp_adjust_tail ||
61d76980 4804#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
fe94cc29
MX		 4805 func == bpf_lwt_seg6_store_bytes ||
4806 func == bpf_lwt_seg6_adjust_srh ||
61d76980
MX		 4807 func == bpf_lwt_seg6_action ||
4808#endif
4809 func == bpf_lwt_push_encap)
fe94cc29
MX		 4810 return true;
4811
4812 return false;
4813}
4814
d4052c4a 4815static const struct bpf_func_proto *
2492d3b8 4816bpf_base_func_proto(enum bpf_func_id func_id)
89aa0758
AS		 4817{
4818 switch (func_id) {
4819 case BPF_FUNC_map_lookup_elem:
4820 return &bpf_map_lookup_elem_proto;
4821 case BPF_FUNC_map_update_elem:
4822 return &bpf_map_update_elem_proto;
4823 case BPF_FUNC_map_delete_elem:
4824 return &bpf_map_delete_elem_proto;
03e69b50
DB		 4825 case BPF_FUNC_get_prandom_u32:
4826 return &bpf_get_prandom_u32_proto;
c04167ce 4827 case BPF_FUNC_get_smp_processor_id:
80b48c44 4828 return &bpf_get_raw_smp_processor_id_proto;
2d0e30c3
DB		 4829 case BPF_FUNC_get_numa_node_id:
4830 return &bpf_get_numa_node_id_proto;
04fd61ab
AS		 4831 case BPF_FUNC_tail_call:
4832 return &bpf_tail_call_proto;
17ca8cbf
DB		 4833 case BPF_FUNC_ktime_get_ns:
4834 return &bpf_ktime_get_ns_proto;
0756ea3e 4835 case BPF_FUNC_trace_printk:
1be7f75d
AS		 4836 if (capable(CAP_SYS_ADMIN))
4837 return bpf_get_trace_printk_proto();
2cc0608e 4838 /* else: fall through */
89aa0758
AS		 4839 default:
4840 return NULL;
4841 }
4842}
4843
ae2cf1c4 4844static const struct bpf_func_proto *
5e43f899 4845sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
ae2cf1c4
DA		 4846{
4847 switch (func_id) {
4848 /* inet and inet6 sockets are created in a process
4849 * context so there is always a valid uid/gid
4850 */
4851 case BPF_FUNC_get_current_uid_gid:
4852 return &bpf_get_current_uid_gid_proto;
cd339431
RG		 4853 case BPF_FUNC_get_local_storage:
4854 return &bpf_get_local_storage_proto;
ae2cf1c4
DA		 4855 default:
4856 return bpf_base_func_proto(func_id);
4857 }
4858}
4859
4fbac77d
AI		 4860static const struct bpf_func_proto *
4861sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4862{
4863 switch (func_id) {
4864 /* inet and inet6 sockets are created in a process
4865 * context so there is always a valid uid/gid
4866 */
4867 case BPF_FUNC_get_current_uid_gid:
4868 return &bpf_get_current_uid_gid_proto;
d74bad4e
AI		 4869 case BPF_FUNC_bind:
4870 switch (prog->expected_attach_type) {
4871 case BPF_CGROUP_INET4_CONNECT:
4872 case BPF_CGROUP_INET6_CONNECT:
4873 return &bpf_bind_proto;
4874 default:
4875 return NULL;
4876 }
d692f113
AI		 4877 case BPF_FUNC_get_socket_cookie:
4878 return &bpf_get_socket_cookie_sock_addr_proto;
cd339431
RG		 4879 case BPF_FUNC_get_local_storage:
4880 return &bpf_get_local_storage_proto;
4fbac77d
AI		 4881 default:
4882 return bpf_base_func_proto(func_id);
4883 }
4884}
4885
2492d3b8 4886static const struct bpf_func_proto *
5e43f899 4887sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
2492d3b8
DB		 4888{
4889 switch (func_id) {
4890 case BPF_FUNC_skb_load_bytes:
4891 return &bpf_skb_load_bytes_proto;
4e1ec56c
DB		 4892 case BPF_FUNC_skb_load_bytes_relative:
4893 return &bpf_skb_load_bytes_relative_proto;
91b8270f
CF		 4894 case BPF_FUNC_get_socket_cookie:
4895 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 4896 case BPF_FUNC_get_socket_uid:
4897 return &bpf_get_socket_uid_proto;
2492d3b8
DB		 4898 default:
4899 return bpf_base_func_proto(func_id);
4900 }
4901}
4902
cd339431
RG		 4903static const struct bpf_func_proto *
4904cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4905{
4906 switch (func_id) {
4907 case BPF_FUNC_get_local_storage:
4908 return &bpf_get_local_storage_proto;
4909 default:
4910 return sk_filter_func_proto(func_id, prog);
4911 }
4912}
4913
608cd71a 4914static const struct bpf_func_proto *
5e43f899 4915tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
608cd71a
AS		 4916{
4917 switch (func_id) {
4918 case BPF_FUNC_skb_store_bytes:
4919 return &bpf_skb_store_bytes_proto;
05c74e5e
DB		 4920 case BPF_FUNC_skb_load_bytes:
4921 return &bpf_skb_load_bytes_proto;
4e1ec56c
DB		 4922 case BPF_FUNC_skb_load_bytes_relative:
4923 return &bpf_skb_load_bytes_relative_proto;
36bbef52
DB		 4924 case BPF_FUNC_skb_pull_data:
4925 return &bpf_skb_pull_data_proto;
7d672345
DB		 4926 case BPF_FUNC_csum_diff:
4927 return &bpf_csum_diff_proto;
36bbef52
DB		 4928 case BPF_FUNC_csum_update:
4929 return &bpf_csum_update_proto;
91bc4822
AS		 4930 case BPF_FUNC_l3_csum_replace:
4931 return &bpf_l3_csum_replace_proto;
4932 case BPF_FUNC_l4_csum_replace:
4933 return &bpf_l4_csum_replace_proto;
3896d655
AS		 4934 case BPF_FUNC_clone_redirect:
4935 return &bpf_clone_redirect_proto;
8d20aabe
DB		 4936 case BPF_FUNC_get_cgroup_classid:
4937 return &bpf_get_cgroup_classid_proto;
4e10df9a
AS		 4938 case BPF_FUNC_skb_vlan_push:
4939 return &bpf_skb_vlan_push_proto;
4940 case BPF_FUNC_skb_vlan_pop:
4941 return &bpf_skb_vlan_pop_proto;
6578171a
DB		 4942 case BPF_FUNC_skb_change_proto:
4943 return &bpf_skb_change_proto_proto;
d2485c42
DB		 4944 case BPF_FUNC_skb_change_type:
4945 return &bpf_skb_change_type_proto;
2be7e212
DB		 4946 case BPF_FUNC_skb_adjust_room:
4947 return &bpf_skb_adjust_room_proto;
5293efe6
DB		 4948 case BPF_FUNC_skb_change_tail:
4949 return &bpf_skb_change_tail_proto;
d3aa45ce
AS		 4950 case BPF_FUNC_skb_get_tunnel_key:
4951 return &bpf_skb_get_tunnel_key_proto;
4952 case BPF_FUNC_skb_set_tunnel_key:
14ca0751
DB		 4953 return bpf_get_skb_set_tunnel_proto(func_id);
4954 case BPF_FUNC_skb_get_tunnel_opt:
4955 return &bpf_skb_get_tunnel_opt_proto;
4956 case BPF_FUNC_skb_set_tunnel_opt:
4957 return bpf_get_skb_set_tunnel_proto(func_id);
27b29f63
AS		 4958 case BPF_FUNC_redirect:
4959 return &bpf_redirect_proto;
c46646d0
DB		 4960 case BPF_FUNC_get_route_realm:
4961 return &bpf_get_route_realm_proto;
13c5c240
DB		 4962 case BPF_FUNC_get_hash_recalc:
4963 return &bpf_get_hash_recalc_proto;
7a4b28c6
DB		 4964 case BPF_FUNC_set_hash_invalid:
4965 return &bpf_set_hash_invalid_proto;
ded092cd
DB		 4966 case BPF_FUNC_set_hash:
4967 return &bpf_set_hash_proto;
bd570ff9 4968 case BPF_FUNC_perf_event_output:
555c8a86 4969 return &bpf_skb_event_output_proto;
80b48c44
DB		 4970 case BPF_FUNC_get_smp_processor_id:
4971 return &bpf_get_smp_processor_id_proto;
747ea55e
DB		 4972 case BPF_FUNC_skb_under_cgroup:
4973 return &bpf_skb_under_cgroup_proto;
91b8270f
CF		 4974 case BPF_FUNC_get_socket_cookie:
4975 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 4976 case BPF_FUNC_get_socket_uid:
4977 return &bpf_get_socket_uid_proto;
cb20b08e
DB		 4978 case BPF_FUNC_fib_lookup:
4979 return &bpf_skb_fib_lookup_proto;
12bed760
EB		 4980#ifdef CONFIG_XFRM
4981 case BPF_FUNC_skb_get_xfrm_state:
4982 return &bpf_skb_get_xfrm_state_proto;
4983#endif
cb20b08e
DB		 4984#ifdef CONFIG_SOCK_CGROUP_DATA
4985 case BPF_FUNC_skb_cgroup_id:
4986 return &bpf_skb_cgroup_id_proto;
77236281
AI		 4987 case BPF_FUNC_skb_ancestor_cgroup_id:
4988 return &bpf_skb_ancestor_cgroup_id_proto;
cb20b08e 4989#endif
608cd71a 4990 default:
2492d3b8 4991 return bpf_base_func_proto(func_id);
608cd71a
AS		 4992 }
4993}
4994
6a773a15 4995static const struct bpf_func_proto *
5e43f899 4996xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6a773a15 4997{
4de16969
DB		 4998 switch (func_id) {
4999 case BPF_FUNC_perf_event_output:
5000 return &bpf_xdp_event_output_proto;
669dc4d7
DB		 5001 case BPF_FUNC_get_smp_processor_id:
5002 return &bpf_get_smp_processor_id_proto;
205c3807
DB		 5003 case BPF_FUNC_csum_diff:
5004 return &bpf_csum_diff_proto;
17bedab2
MKL		 5005 case BPF_FUNC_xdp_adjust_head:
5006 return &bpf_xdp_adjust_head_proto;
de8f3a83
DB		 5007 case BPF_FUNC_xdp_adjust_meta:
5008 return &bpf_xdp_adjust_meta_proto;
814abfab
JF		 5009 case BPF_FUNC_redirect:
5010 return &bpf_xdp_redirect_proto;
97f91a7c 5011 case BPF_FUNC_redirect_map:
e4a8e817 5012 return &bpf_xdp_redirect_map_proto;
b32cc5b9
NS		 5013 case BPF_FUNC_xdp_adjust_tail:
5014 return &bpf_xdp_adjust_tail_proto;
87f5fc7e
DA		 5015 case BPF_FUNC_fib_lookup:
5016 return &bpf_xdp_fib_lookup_proto;
4de16969 5017 default:
2492d3b8 5018 return bpf_base_func_proto(func_id);
4de16969 5019 }
6a773a15
BB		 5020}
5021
8c4b4c7e 5022static const struct bpf_func_proto *
5e43f899 5023sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8c4b4c7e
LB		 5024{
5025 switch (func_id) {
5026 case BPF_FUNC_setsockopt:
5027 return &bpf_setsockopt_proto;
cd86d1fd
LB		 5028 case BPF_FUNC_getsockopt:
5029 return &bpf_getsockopt_proto;
b13d8807
LB		 5030 case BPF_FUNC_sock_ops_cb_flags_set:
5031 return &bpf_sock_ops_cb_flags_set_proto;
174a79ff
JF		 5032 case BPF_FUNC_sock_map_update:
5033 return &bpf_sock_map_update_proto;
81110384
JF		 5034 case BPF_FUNC_sock_hash_update:
5035 return &bpf_sock_hash_update_proto;
d692f113
AI		 5036 case BPF_FUNC_get_socket_cookie:
5037 return &bpf_get_socket_cookie_sock_ops_proto;
cd339431
RG		 5038 case BPF_FUNC_get_local_storage:
5039 return &bpf_get_local_storage_proto;
8c4b4c7e
LB		 5040 default:
5041 return bpf_base_func_proto(func_id);
5042 }
5043}
5044
5e43f899
AI		 5045static const struct bpf_func_proto *
5046sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4f738adb
JF		 5047{
5048 switch (func_id) {
5049 case BPF_FUNC_msg_redirect_map:
5050 return &bpf_msg_redirect_map_proto;
81110384
JF		 5051 case BPF_FUNC_msg_redirect_hash:
5052 return &bpf_msg_redirect_hash_proto;
2a100317
JF		 5053 case BPF_FUNC_msg_apply_bytes:
5054 return &bpf_msg_apply_bytes_proto;
91843d54
JF		 5055 case BPF_FUNC_msg_cork_bytes:
5056 return &bpf_msg_cork_bytes_proto;
015632bb
JF		 5057 case BPF_FUNC_msg_pull_data:
5058 return &bpf_msg_pull_data_proto;
cd339431
RG		 5059 case BPF_FUNC_get_local_storage:
5060 return &bpf_get_local_storage_proto;
4f738adb
JF		 5061 default:
5062 return bpf_base_func_proto(func_id);
5063 }
5064}
5065
5e43f899
AI		 5066static const struct bpf_func_proto *
5067sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
b005fd18
JF		 5068{
5069 switch (func_id) {
8a31db56
JF		 5070 case BPF_FUNC_skb_store_bytes:
5071 return &bpf_skb_store_bytes_proto;
b005fd18
JF		 5072 case BPF_FUNC_skb_load_bytes:
5073 return &bpf_skb_load_bytes_proto;
8a31db56 5074 case BPF_FUNC_skb_pull_data:
0ea488ff 5075 return &sk_skb_pull_data_proto;
8a31db56 5076 case BPF_FUNC_skb_change_tail:
0ea488ff 5077 return &sk_skb_change_tail_proto;
8a31db56 5078 case BPF_FUNC_skb_change_head:
0ea488ff 5079 return &sk_skb_change_head_proto;
b005fd18
JF		 5080 case BPF_FUNC_get_socket_cookie:
5081 return &bpf_get_socket_cookie_proto;
5082 case BPF_FUNC_get_socket_uid:
5083 return &bpf_get_socket_uid_proto;
174a79ff
JF		 5084 case BPF_FUNC_sk_redirect_map:
5085 return &bpf_sk_redirect_map_proto;
81110384
JF		 5086 case BPF_FUNC_sk_redirect_hash:
5087 return &bpf_sk_redirect_hash_proto;
cd339431
RG		 5088 case BPF_FUNC_get_local_storage:
5089 return &bpf_get_local_storage_proto;
b005fd18
JF		 5090 default:
5091 return bpf_base_func_proto(func_id);
5092 }
5093}
5094
cd3092c7
MX		 5095static const struct bpf_func_proto *
5096lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5097{
5098 switch (func_id) {
5099 case BPF_FUNC_skb_load_bytes:
5100 return &bpf_skb_load_bytes_proto;
5101 case BPF_FUNC_skb_pull_data:
5102 return &bpf_skb_pull_data_proto;
5103 case BPF_FUNC_csum_diff:
5104 return &bpf_csum_diff_proto;
5105 case BPF_FUNC_get_cgroup_classid:
5106 return &bpf_get_cgroup_classid_proto;
5107 case BPF_FUNC_get_route_realm:
5108 return &bpf_get_route_realm_proto;
5109 case BPF_FUNC_get_hash_recalc:
5110 return &bpf_get_hash_recalc_proto;
5111 case BPF_FUNC_perf_event_output:
5112 return &bpf_skb_event_output_proto;
5113 case BPF_FUNC_get_smp_processor_id:
5114 return &bpf_get_smp_processor_id_proto;
5115 case BPF_FUNC_skb_under_cgroup:
5116 return &bpf_skb_under_cgroup_proto;
5117 default:
5118 return bpf_base_func_proto(func_id);
5119 }
5120}
5121
5122static const struct bpf_func_proto *
5123lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5124{
5125 switch (func_id) {
5126 case BPF_FUNC_lwt_push_encap:
5127 return &bpf_lwt_push_encap_proto;
5128 default:
5129 return lwt_out_func_proto(func_id, prog);
5130 }
5131}
5132
3a0af8fd 5133static const struct bpf_func_proto *
5e43f899 5134lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
3a0af8fd
TG		 5135{
5136 switch (func_id) {
5137 case BPF_FUNC_skb_get_tunnel_key:
5138 return &bpf_skb_get_tunnel_key_proto;
5139 case BPF_FUNC_skb_set_tunnel_key:
5140 return bpf_get_skb_set_tunnel_proto(func_id);
5141 case BPF_FUNC_skb_get_tunnel_opt:
5142 return &bpf_skb_get_tunnel_opt_proto;
5143 case BPF_FUNC_skb_set_tunnel_opt:
5144 return bpf_get_skb_set_tunnel_proto(func_id);
5145 case BPF_FUNC_redirect:
5146 return &bpf_redirect_proto;
5147 case BPF_FUNC_clone_redirect:
5148 return &bpf_clone_redirect_proto;
5149 case BPF_FUNC_skb_change_tail:
5150 return &bpf_skb_change_tail_proto;
5151 case BPF_FUNC_skb_change_head:
5152 return &bpf_skb_change_head_proto;
5153 case BPF_FUNC_skb_store_bytes:
5154 return &bpf_skb_store_bytes_proto;
5155 case BPF_FUNC_csum_update:
5156 return &bpf_csum_update_proto;
5157 case BPF_FUNC_l3_csum_replace:
5158 return &bpf_l3_csum_replace_proto;
5159 case BPF_FUNC_l4_csum_replace:
5160 return &bpf_l4_csum_replace_proto;
5161 case BPF_FUNC_set_hash_invalid:
5162 return &bpf_set_hash_invalid_proto;
5163 default:
cd3092c7 5164 return lwt_out_func_proto(func_id, prog);
3a0af8fd
TG		 5165 }
5166}
5167
004d4b27
MX		 5168static const struct bpf_func_proto *
5169lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5170{
5171 switch (func_id) {
61d76980 5172#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
004d4b27
MX		 5173 case BPF_FUNC_lwt_seg6_store_bytes:
5174 return &bpf_lwt_seg6_store_bytes_proto;
5175 case BPF_FUNC_lwt_seg6_action:
5176 return &bpf_lwt_seg6_action_proto;
5177 case BPF_FUNC_lwt_seg6_adjust_srh:
5178 return &bpf_lwt_seg6_adjust_srh_proto;
61d76980 5179#endif
004d4b27
MX		 5180 default:
5181 return lwt_out_func_proto(func_id, prog);
3a0af8fd
TG		 5182 }
5183}
5184
f96da094 5185static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
5e43f899 5186 const struct bpf_prog *prog,
f96da094 5187 struct bpf_insn_access_aux *info)
23994631 5188{
f96da094 5189 const int size_default = sizeof(__u32);
23994631 5190
9bac3d6d
AS		 5191 if (off < 0 || off >= sizeof(struct __sk_buff))
5192 return false;
62c7989b 5193
4936e352 5194 /* The verifier guarantees that size > 0. */
9bac3d6d
AS		 5195 if (off % size != 0)
5196 return false;
62c7989b
DB		 5197
5198 switch (off) {
f96da094
DB		 5199 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
5200 if (off + size > offsetofend(struct __sk_buff, cb[4]))
62c7989b
DB		 5201 return false;
5202 break;
8a31db56
JF		 5203 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
5204 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
5205 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
5206 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
f96da094 5207 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 5208 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094
DB		 5209 case bpf_ctx_range(struct __sk_buff, data_end):
5210 if (size != size_default)
23994631 5211 return false;
31fd8581
YS		 5212 break;
5213 default:
f96da094 5214 /* Only narrow read access allowed for now. */
31fd8581 5215 if (type == BPF_WRITE) {
f96da094 5216 if (size != size_default)
31fd8581
YS		 5217 return false;
5218 } else {
f96da094
DB		 5219 bpf_ctx_record_field_size(info, size_default);
5220 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
23994631 5221 return false;
31fd8581 5222 }
62c7989b 5223 }
9bac3d6d
AS		 5224
5225 return true;
5226}
5227
d691f9e8 5228static bool sk_filter_is_valid_access(int off, int size,
19de99f7 5229 enum bpf_access_type type,
5e43f899 5230 const struct bpf_prog *prog,
23994631 5231 struct bpf_insn_access_aux *info)
d691f9e8 5232{
db58ba45 5233 switch (off) {
f96da094
DB		 5234 case bpf_ctx_range(struct __sk_buff, tc_classid):
5235 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 5236 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094 5237 case bpf_ctx_range(struct __sk_buff, data_end):
8a31db56 5238 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
045efa82 5239 return false;
db58ba45 5240 }
045efa82 5241
d691f9e8
AS		 5242 if (type == BPF_WRITE) {
5243 switch (off) {
f96da094 5244 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 5245 break;
5246 default:
5247 return false;
5248 }
5249 }
5250
5e43f899 5251 return bpf_skb_is_valid_access(off, size, type, prog, info);
d691f9e8
AS		 5252}
5253
3a0af8fd
TG		 5254static bool lwt_is_valid_access(int off, int size,
5255 enum bpf_access_type type,
5e43f899 5256 const struct bpf_prog *prog,
23994631 5257 struct bpf_insn_access_aux *info)
3a0af8fd
TG		 5258{
5259 switch (off) {
f96da094 5260 case bpf_ctx_range(struct __sk_buff, tc_classid):
8a31db56 5261 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
de8f3a83 5262 case bpf_ctx_range(struct __sk_buff, data_meta):
3a0af8fd
TG		 5263 return false;
5264 }
5265
5266 if (type == BPF_WRITE) {
5267 switch (off) {
f96da094
DB		 5268 case bpf_ctx_range(struct __sk_buff, mark):
5269 case bpf_ctx_range(struct __sk_buff, priority):
5270 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3a0af8fd
TG		 5271 break;
5272 default:
5273 return false;
5274 }
5275 }
5276
f96da094
DB		 5277 switch (off) {
5278 case bpf_ctx_range(struct __sk_buff, data):
5279 info->reg_type = PTR_TO_PACKET;
5280 break;
5281 case bpf_ctx_range(struct __sk_buff, data_end):
5282 info->reg_type = PTR_TO_PACKET_END;
5283 break;
5284 }
5285
5e43f899 5286 return bpf_skb_is_valid_access(off, size, type, prog, info);
3a0af8fd
TG		 5287}
5288
aac3fc32
AI		 5289/* Attach type specific accesses */
5290static bool __sock_filter_check_attach_type(int off,
5291 enum bpf_access_type access_type,
5292 enum bpf_attach_type attach_type)
61023658 5293{
aac3fc32
AI		 5294 switch (off) {
5295 case offsetof(struct bpf_sock, bound_dev_if):
5296 case offsetof(struct bpf_sock, mark):
5297 case offsetof(struct bpf_sock, priority):
5298 switch (attach_type) {
5299 case BPF_CGROUP_INET_SOCK_CREATE:
5300 goto full_access;
5301 default:
5302 return false;
5303 }
5304 case bpf_ctx_range(struct bpf_sock, src_ip4):
5305 switch (attach_type) {
5306 case BPF_CGROUP_INET4_POST_BIND:
5307 goto read_only;
5308 default:
5309 return false;
5310 }
5311 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
5312 switch (attach_type) {
5313 case BPF_CGROUP_INET6_POST_BIND:
5314 goto read_only;
5315 default:
5316 return false;
5317 }
5318 case bpf_ctx_range(struct bpf_sock, src_port):
5319 switch (attach_type) {
5320 case BPF_CGROUP_INET4_POST_BIND:
5321 case BPF_CGROUP_INET6_POST_BIND:
5322 goto read_only;
61023658
DA		 5323 default:
5324 return false;
5325 }
5326 }
aac3fc32
AI		 5327read_only:
5328 return access_type == BPF_READ;
5329full_access:
5330 return true;
5331}
5332
5333static bool __sock_filter_check_size(int off, int size,
5334 struct bpf_insn_access_aux *info)
5335{
5336 const int size_default = sizeof(__u32);
61023658 5337
aac3fc32
AI		 5338 switch (off) {
5339 case bpf_ctx_range(struct bpf_sock, src_ip4):
5340 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
5341 bpf_ctx_record_field_size(info, size_default);
5342 return bpf_ctx_narrow_access_ok(off, size, size_default);
5343 }
5344
5345 return size == size_default;
5346}
5347
5348static bool sock_filter_is_valid_access(int off, int size,
5349 enum bpf_access_type type,
5350 const struct bpf_prog *prog,
5351 struct bpf_insn_access_aux *info)
5352{
5353 if (off < 0 || off >= sizeof(struct bpf_sock))
61023658 5354 return false;
61023658
DA		 5355 if (off % size != 0)
5356 return false;
aac3fc32
AI		 5357 if (!__sock_filter_check_attach_type(off, type,
5358 prog->expected_attach_type))
5359 return false;
5360 if (!__sock_filter_check_size(off, size, info))
61023658 5361 return false;
61023658
DA		 5362 return true;
5363}
5364
047b0ecd
DB		 5365static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
5366 const struct bpf_prog *prog, int drop_verdict)
36bbef52
DB		 5367{
5368 struct bpf_insn *insn = insn_buf;
5369
5370 if (!direct_write)
5371 return 0;
5372
5373 /* if (!skb->cloned)
5374 * goto start;
5375 *
5376 * (Fast-path, otherwise approximation that we might be
5377 * a clone, do the rest in helper.)
5378 */
5379 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
5380 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
5381 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
5382
5383 /* ret = bpf_skb_pull_data(skb, 0); */
5384 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
5385 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
5386 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
5387 BPF_FUNC_skb_pull_data);
5388 /* if (!ret)
5389 * goto restore;
5390 * return TC_ACT_SHOT;
5391 */
5392 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
047b0ecd 5393 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
36bbef52
DB		 5394 *insn++ = BPF_EXIT_INSN();
5395
5396 /* restore: */
5397 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
5398 /* start: */
5399 *insn++ = prog->insnsi[0];
5400
5401 return insn - insn_buf;
5402}
5403
e0cea7ce
DB		 5404static int bpf_gen_ld_abs(const struct bpf_insn *orig,
5405 struct bpf_insn *insn_buf)
5406{
5407 bool indirect = BPF_MODE(orig->code) == BPF_IND;
5408 struct bpf_insn *insn = insn_buf;
5409
5410 /* We're guaranteed here that CTX is in R6. */
5411 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
5412 if (!indirect) {
5413 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
5414 } else {
5415 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
5416 if (orig->imm)
5417 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
5418 }
5419
5420 switch (BPF_SIZE(orig->code)) {
5421 case BPF_B:
5422 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
5423 break;
5424 case BPF_H:
5425 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
5426 break;
5427 case BPF_W:
5428 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
5429 break;
5430 }
5431
5432 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
5433 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
5434 *insn++ = BPF_EXIT_INSN();
5435
5436 return insn - insn_buf;
5437}
5438
047b0ecd
DB		 5439static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
5440 const struct bpf_prog *prog)
5441{
5442 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
5443}
5444
d691f9e8 5445static bool tc_cls_act_is_valid_access(int off, int size,
19de99f7 5446 enum bpf_access_type type,
5e43f899 5447 const struct bpf_prog *prog,
23994631 5448 struct bpf_insn_access_aux *info)
d691f9e8
AS		 5449{
5450 if (type == BPF_WRITE) {
5451 switch (off) {
f96da094
DB		 5452 case bpf_ctx_range(struct __sk_buff, mark):
5453 case bpf_ctx_range(struct __sk_buff, tc_index):
5454 case bpf_ctx_range(struct __sk_buff, priority):
5455 case bpf_ctx_range(struct __sk_buff, tc_classid):
5456 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 5457 break;
5458 default:
5459 return false;
5460 }
5461 }
19de99f7 5462
f96da094
DB		 5463 switch (off) {
5464 case bpf_ctx_range(struct __sk_buff, data):
5465 info->reg_type = PTR_TO_PACKET;
5466 break;
de8f3a83
DB		 5467 case bpf_ctx_range(struct __sk_buff, data_meta):
5468 info->reg_type = PTR_TO_PACKET_META;
5469 break;
f96da094
DB		 5470 case bpf_ctx_range(struct __sk_buff, data_end):
5471 info->reg_type = PTR_TO_PACKET_END;
5472 break;
8a31db56
JF		 5473 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
5474 return false;
f96da094
DB		 5475 }
5476
5e43f899 5477 return bpf_skb_is_valid_access(off, size, type, prog, info);
d691f9e8
AS		 5478}
5479
1afaf661 5480static bool __is_valid_xdp_access(int off, int size)
6a773a15
BB		 5481{
5482 if (off < 0 || off >= sizeof(struct xdp_md))
5483 return false;
5484 if (off % size != 0)
5485 return false;
6088b582 5486 if (size != sizeof(__u32))
6a773a15
BB		 5487 return false;
5488
5489 return true;
5490}
5491
5492static bool xdp_is_valid_access(int off, int size,
5493 enum bpf_access_type type,
5e43f899 5494 const struct bpf_prog *prog,
23994631 5495 struct bpf_insn_access_aux *info)
6a773a15 5496{
0d830032
JK		 5497 if (type == BPF_WRITE) {
5498 if (bpf_prog_is_dev_bound(prog->aux)) {
5499 switch (off) {
5500 case offsetof(struct xdp_md, rx_queue_index):
5501 return __is_valid_xdp_access(off, size);
5502 }
5503 }
6a773a15 5504 return false;
0d830032 5505 }
6a773a15
BB		 5506
5507 switch (off) {
5508 case offsetof(struct xdp_md, data):
23994631 5509 info->reg_type = PTR_TO_PACKET;
6a773a15 5510 break;
de8f3a83
DB		 5511 case offsetof(struct xdp_md, data_meta):
5512 info->reg_type = PTR_TO_PACKET_META;
5513 break;
6a773a15 5514 case offsetof(struct xdp_md, data_end):
23994631 5515 info->reg_type = PTR_TO_PACKET_END;
6a773a15
BB		 5516 break;
5517 }
5518
1afaf661 5519 return __is_valid_xdp_access(off, size);
6a773a15
BB		 5520}
5521
5522void bpf_warn_invalid_xdp_action(u32 act)
5523{
9beb8bed
DB		 5524 const u32 act_max = XDP_REDIRECT;
5525
5526 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
5527 act > act_max ? "Illegal" : "Driver unsupported",
5528 act);
6a773a15
BB		 5529}
5530EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
5531
4fbac77d
AI		 5532static bool sock_addr_is_valid_access(int off, int size,
5533 enum bpf_access_type type,
5534 const struct bpf_prog *prog,
5535 struct bpf_insn_access_aux *info)
5536{
5537 const int size_default = sizeof(__u32);
5538
5539 if (off < 0 || off >= sizeof(struct bpf_sock_addr))
5540 return false;
5541 if (off % size != 0)
5542 return false;
5543
5544 /* Disallow access to IPv6 fields from IPv4 contex and vise
5545 * versa.
5546 */
5547 switch (off) {
5548 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
5549 switch (prog->expected_attach_type) {
5550 case BPF_CGROUP_INET4_BIND:
d74bad4e 5551 case BPF_CGROUP_INET4_CONNECT:
1cedee13 5552 case BPF_CGROUP_UDP4_SENDMSG:
4fbac77d
AI		 5553 break;
5554 default:
5555 return false;
5556 }
5557 break;
5558 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
5559 switch (prog->expected_attach_type) {
5560 case BPF_CGROUP_INET6_BIND:
d74bad4e 5561 case BPF_CGROUP_INET6_CONNECT:
1cedee13
AI		 5562 case BPF_CGROUP_UDP6_SENDMSG:
5563 break;
5564 default:
5565 return false;
5566 }
5567 break;
5568 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
5569 switch (prog->expected_attach_type) {
5570 case BPF_CGROUP_UDP4_SENDMSG:
5571 break;
5572 default:
5573 return false;
5574 }
5575 break;
5576 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
5577 msg_src_ip6[3]):
5578 switch (prog->expected_attach_type) {
5579 case BPF_CGROUP_UDP6_SENDMSG:
4fbac77d
AI		 5580 break;
5581 default:
5582 return false;
5583 }
5584 break;
5585 }
5586
5587 switch (off) {
5588 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
5589 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
1cedee13
AI		 5590 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
5591 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
5592 msg_src_ip6[3]):
4fbac77d
AI		 5593 /* Only narrow read access allowed for now. */
5594 if (type == BPF_READ) {
5595 bpf_ctx_record_field_size(info, size_default);
5596 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
5597 return false;
5598 } else {
5599 if (size != size_default)
5600 return false;
5601 }
5602 break;
5603 case bpf_ctx_range(struct bpf_sock_addr, user_port):
5604 if (size != size_default)
5605 return false;
5606 break;
5607 default:
5608 if (type == BPF_READ) {
5609 if (size != size_default)
5610 return false;
5611 } else {
5612 return false;
5613 }
5614 }
5615
5616 return true;
5617}
5618
44f0e430
LB		 5619static bool sock_ops_is_valid_access(int off, int size,
5620 enum bpf_access_type type,
5e43f899 5621 const struct bpf_prog *prog,
44f0e430 5622 struct bpf_insn_access_aux *info)
40304b2a 5623{
44f0e430
LB		 5624 const int size_default = sizeof(__u32);
5625
40304b2a
LB		 5626 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
5627 return false;
44f0e430 5628
40304b2a
LB		 5629 /* The verifier guarantees that size > 0. */
5630 if (off % size != 0)
5631 return false;
40304b2a 5632
40304b2a
LB		 5633 if (type == BPF_WRITE) {
5634 switch (off) {
2585cd62 5635 case offsetof(struct bpf_sock_ops, reply):
6f9bd3d7 5636 case offsetof(struct bpf_sock_ops, sk_txhash):
44f0e430
LB		 5637 if (size != size_default)
5638 return false;
40304b2a
LB		 5639 break;
5640 default:
5641 return false;
5642 }
44f0e430
LB		 5643 } else {
5644 switch (off) {
5645 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
5646 bytes_acked):
5647 if (size != sizeof(__u64))
5648 return false;
5649 break;
5650 default:
5651 if (size != size_default)
5652 return false;
5653 break;
5654 }
40304b2a
LB		 5655 }
5656
44f0e430 5657 return true;
40304b2a
LB		 5658}
5659
8a31db56
JF		 5660static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
5661 const struct bpf_prog *prog)
5662{
047b0ecd 5663 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
8a31db56
JF		 5664}
5665
b005fd18
JF		 5666static bool sk_skb_is_valid_access(int off, int size,
5667 enum bpf_access_type type,
5e43f899 5668 const struct bpf_prog *prog,
b005fd18
JF		 5669 struct bpf_insn_access_aux *info)
5670{
de8f3a83
DB		 5671 switch (off) {
5672 case bpf_ctx_range(struct __sk_buff, tc_classid):
5673 case bpf_ctx_range(struct __sk_buff, data_meta):
5674 return false;
5675 }
5676
8a31db56
JF		 5677 if (type == BPF_WRITE) {
5678 switch (off) {
8a31db56
JF		 5679 case bpf_ctx_range(struct __sk_buff, tc_index):
5680 case bpf_ctx_range(struct __sk_buff, priority):
5681 break;
5682 default:
5683 return false;
5684 }
5685 }
5686
b005fd18 5687 switch (off) {
f7e9cb1e 5688 case bpf_ctx_range(struct __sk_buff, mark):
8a31db56 5689 return false;
b005fd18
JF		 5690 case bpf_ctx_range(struct __sk_buff, data):
5691 info->reg_type = PTR_TO_PACKET;
5692 break;
5693 case bpf_ctx_range(struct __sk_buff, data_end):
5694 info->reg_type = PTR_TO_PACKET_END;
5695 break;
5696 }
5697
5e43f899 5698 return bpf_skb_is_valid_access(off, size, type, prog, info);
b005fd18
JF		 5699}
5700
4f738adb
JF		 5701static bool sk_msg_is_valid_access(int off, int size,
5702 enum bpf_access_type type,
5e43f899 5703 const struct bpf_prog *prog,
4f738adb
JF		 5704 struct bpf_insn_access_aux *info)
5705{
5706 if (type == BPF_WRITE)
5707 return false;
5708
5709 switch (off) {
5710 case offsetof(struct sk_msg_md, data):
5711 info->reg_type = PTR_TO_PACKET;
303def35
JF		 5712 if (size != sizeof(__u64))
5713 return false;
4f738adb
JF		 5714 break;
5715 case offsetof(struct sk_msg_md, data_end):
5716 info->reg_type = PTR_TO_PACKET_END;
303def35
JF		 5717 if (size != sizeof(__u64))
5718 return false;
4f738adb 5719 break;
303def35
JF		 5720 default:
5721 if (size != sizeof(__u32))
5722 return false;
4f738adb
JF		 5723 }
5724
5725 if (off < 0 || off >= sizeof(struct sk_msg_md))
5726 return false;
5727 if (off % size != 0)
5728 return false;
4f738adb
JF		 5729
5730 return true;
5731}
5732
2492d3b8
DB		 5733static u32 bpf_convert_ctx_access(enum bpf_access_type type,
5734 const struct bpf_insn *si,
5735 struct bpf_insn *insn_buf,
f96da094 5736 struct bpf_prog *prog, u32 *target_size)
9bac3d6d
AS		 5737{
5738 struct bpf_insn *insn = insn_buf;
6b8cc1d1 5739 int off;
9bac3d6d 5740
6b8cc1d1 5741 switch (si->off) {
9bac3d6d 5742 case offsetof(struct __sk_buff, len):
6b8cc1d1 5743 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5744 bpf_target_off(struct sk_buff, len, 4,
5745 target_size));
9bac3d6d
AS		 5746 break;
5747
0b8c707d 5748 case offsetof(struct __sk_buff, protocol):
6b8cc1d1 5749 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5750 bpf_target_off(struct sk_buff, protocol, 2,
5751 target_size));
0b8c707d
DB		 5752 break;
5753
27cd5452 5754 case offsetof(struct __sk_buff, vlan_proto):
6b8cc1d1 5755 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5756 bpf_target_off(struct sk_buff, vlan_proto, 2,
5757 target_size));
27cd5452
MS		 5758 break;
5759
bcad5718 5760 case offsetof(struct __sk_buff, priority):
754f1e6a 5761 if (type == BPF_WRITE)
6b8cc1d1 5762 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5763 bpf_target_off(struct sk_buff, priority, 4,
5764 target_size));
754f1e6a 5765 else
6b8cc1d1 5766 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5767 bpf_target_off(struct sk_buff, priority, 4,
5768 target_size));
bcad5718
DB		 5769 break;
5770
37e82c2f 5771 case offsetof(struct __sk_buff, ingress_ifindex):
6b8cc1d1 5772 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5773 bpf_target_off(struct sk_buff, skb_iif, 4,
5774 target_size));
37e82c2f
AS		 5775 break;
5776
5777 case offsetof(struct __sk_buff, ifindex):
f035a515 5778 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 5779 si->dst_reg, si->src_reg,
37e82c2f 5780 offsetof(struct sk_buff, dev));
6b8cc1d1
DB		 5781 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
5782 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 5783 bpf_target_off(struct net_device, ifindex, 4,
5784 target_size));
37e82c2f
AS		 5785 break;
5786
ba7591d8 5787 case offsetof(struct __sk_buff, hash):
6b8cc1d1 5788 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5789 bpf_target_off(struct sk_buff, hash, 4,
5790 target_size));
ba7591d8
DB		 5791 break;
5792
9bac3d6d 5793 case offsetof(struct __sk_buff, mark):
d691f9e8 5794 if (type == BPF_WRITE)
6b8cc1d1 5795 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5796 bpf_target_off(struct sk_buff, mark, 4,
5797 target_size));
d691f9e8 5798 else
6b8cc1d1 5799 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5800 bpf_target_off(struct sk_buff, mark, 4,
5801 target_size));
d691f9e8 5802 break;
9bac3d6d
AS		 5803
5804 case offsetof(struct __sk_buff, pkt_type):
f96da094
DB		 5805 *target_size = 1;
5806 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
5807 PKT_TYPE_OFFSET());
5808 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
5809#ifdef __BIG_ENDIAN_BITFIELD
5810 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
5811#endif
5812 break;
9bac3d6d
AS		 5813
5814 case offsetof(struct __sk_buff, queue_mapping):
f96da094
DB		 5815 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
5816 bpf_target_off(struct sk_buff, queue_mapping, 2,
5817 target_size));
5818 break;
c2497395 5819
c2497395 5820 case offsetof(struct __sk_buff, vlan_present):
c2497395 5821 case offsetof(struct __sk_buff, vlan_tci):
f96da094
DB		 5822 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
5823
5824 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
5825 bpf_target_off(struct sk_buff, vlan_tci, 2,
5826 target_size));
5827 if (si->off == offsetof(struct __sk_buff, vlan_tci)) {
5828 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg,
5829 ~VLAN_TAG_PRESENT);
5830 } else {
5831 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12);
5832 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
5833 }
5834 break;
d691f9e8
AS		 5835
5836 case offsetof(struct __sk_buff, cb[0]) ...
f96da094 5837 offsetofend(struct __sk_buff, cb[4]) - 1:
d691f9e8 5838 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20);
62c7989b
DB		 5839 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
5840 offsetof(struct qdisc_skb_cb, data)) %
5841 sizeof(__u64));
d691f9e8 5842
ff936a04 5843 prog->cb_access = 1;
6b8cc1d1
DB		 5844 off = si->off;
5845 off -= offsetof(struct __sk_buff, cb[0]);
5846 off += offsetof(struct sk_buff, cb);
5847 off += offsetof(struct qdisc_skb_cb, data);
d691f9e8 5848 if (type == BPF_WRITE)
62c7989b 5849 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 5850 si->src_reg, off);
d691f9e8 5851 else
62c7989b 5852 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 5853 si->src_reg, off);
d691f9e8
AS		 5854 break;
5855
045efa82 5856 case offsetof(struct __sk_buff, tc_classid):
6b8cc1d1
DB		 5857 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2);
5858
5859 off = si->off;
5860 off -= offsetof(struct __sk_buff, tc_classid);
5861 off += offsetof(struct sk_buff, cb);
5862 off += offsetof(struct qdisc_skb_cb, tc_classid);
f96da094 5863 *target_size = 2;
09c37a2c 5864 if (type == BPF_WRITE)
6b8cc1d1
DB		 5865 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
5866 si->src_reg, off);
09c37a2c 5867 else
6b8cc1d1
DB		 5868 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
5869 si->src_reg, off);
045efa82
DB		 5870 break;
5871
db58ba45 5872 case offsetof(struct __sk_buff, data):
f035a515 5873 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
6b8cc1d1 5874 si->dst_reg, si->src_reg,
db58ba45
AS		 5875 offsetof(struct sk_buff, data));
5876 break;
5877
de8f3a83
DB		 5878 case offsetof(struct __sk_buff, data_meta):
5879 off = si->off;
5880 off -= offsetof(struct __sk_buff, data_meta);
5881 off += offsetof(struct sk_buff, cb);
5882 off += offsetof(struct bpf_skb_data_end, data_meta);
5883 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
5884 si->src_reg, off);
5885 break;
5886
db58ba45 5887 case offsetof(struct __sk_buff, data_end):
6b8cc1d1
DB		 5888 off = si->off;
5889 off -= offsetof(struct __sk_buff, data_end);
5890 off += offsetof(struct sk_buff, cb);
5891 off += offsetof(struct bpf_skb_data_end, data_end);
5892 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
5893 si->src_reg, off);
db58ba45
AS		 5894 break;
5895
d691f9e8
AS		 5896 case offsetof(struct __sk_buff, tc_index):
5897#ifdef CONFIG_NET_SCHED
d691f9e8 5898 if (type == BPF_WRITE)
6b8cc1d1 5899 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5900 bpf_target_off(struct sk_buff, tc_index, 2,
5901 target_size));
d691f9e8 5902 else
6b8cc1d1 5903 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5904 bpf_target_off(struct sk_buff, tc_index, 2,
5905 target_size));
d691f9e8 5906#else
2ed46ce4 5907 *target_size = 2;
d691f9e8 5908 if (type == BPF_WRITE)
6b8cc1d1 5909 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
d691f9e8 5910 else
6b8cc1d1 5911 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
b1d9fc41
DB		 5912#endif
5913 break;
5914
5915 case offsetof(struct __sk_buff, napi_id):
5916#if defined(CONFIG_NET_RX_BUSY_POLL)
b1d9fc41 5917 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5918 bpf_target_off(struct sk_buff, napi_id, 4,
5919 target_size));
b1d9fc41
DB		 5920 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
5921 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
5922#else
2ed46ce4 5923 *target_size = 4;
b1d9fc41 5924 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
d691f9e8 5925#endif
6b8cc1d1 5926 break;
8a31db56
JF		 5927 case offsetof(struct __sk_buff, family):
5928 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
5929
5930 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
5931 si->dst_reg, si->src_reg,
5932 offsetof(struct sk_buff, sk));
5933 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
5934 bpf_target_off(struct sock_common,
5935 skc_family,
5936 2, target_size));
5937 break;
5938 case offsetof(struct __sk_buff, remote_ip4):
5939 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
5940
5941 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
5942 si->dst_reg, si->src_reg,
5943 offsetof(struct sk_buff, sk));
5944 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
5945 bpf_target_off(struct sock_common,
5946 skc_daddr,
5947 4, target_size));
5948 break;
5949 case offsetof(struct __sk_buff, local_ip4):
5950 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
5951 skc_rcv_saddr) != 4);
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 bpf_target_off(struct sock_common,
5958 skc_rcv_saddr,
5959 4, target_size));
5960 break;
5961 case offsetof(struct __sk_buff, remote_ip6[0]) ...
5962 offsetof(struct __sk_buff, remote_ip6[3]):
5963#if IS_ENABLED(CONFIG_IPV6)
5964 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
5965 skc_v6_daddr.s6_addr32[0]) != 4);
5966
5967 off = si->off;
5968 off -= offsetof(struct __sk_buff, remote_ip6[0]);
5969
5970 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
5971 si->dst_reg, si->src_reg,
5972 offsetof(struct sk_buff, sk));
5973 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
5974 offsetof(struct sock_common,
5975 skc_v6_daddr.s6_addr32[0]) +
5976 off);
5977#else
5978 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
5979#endif
5980 break;
5981 case offsetof(struct __sk_buff, local_ip6[0]) ...
5982 offsetof(struct __sk_buff, local_ip6[3]):
5983#if IS_ENABLED(CONFIG_IPV6)
5984 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
5985 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
5986
5987 off = si->off;
5988 off -= offsetof(struct __sk_buff, local_ip6[0]);
5989
5990 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
5991 si->dst_reg, si->src_reg,
5992 offsetof(struct sk_buff, sk));
5993 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
5994 offsetof(struct sock_common,
5995 skc_v6_rcv_saddr.s6_addr32[0]) +
5996 off);
5997#else
5998 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
5999#endif
6000 break;
6001
6002 case offsetof(struct __sk_buff, remote_port):
6003 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6004
6005 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6006 si->dst_reg, si->src_reg,
6007 offsetof(struct sk_buff, sk));
6008 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6009 bpf_target_off(struct sock_common,
6010 skc_dport,
6011 2, target_size));
6012#ifndef __BIG_ENDIAN_BITFIELD
6013 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6014#endif
6015 break;
6016
6017 case offsetof(struct __sk_buff, local_port):
6018 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6019
6020 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6021 si->dst_reg, si->src_reg,
6022 offsetof(struct sk_buff, sk));
6023 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6024 bpf_target_off(struct sock_common,
6025 skc_num, 2, target_size));
6026 break;
9bac3d6d
AS		 6027 }
6028
6029 return insn - insn_buf;
89aa0758
AS		 6030}
6031
61023658 6032static u32 sock_filter_convert_ctx_access(enum bpf_access_type type,
6b8cc1d1 6033 const struct bpf_insn *si,
61023658 6034 struct bpf_insn *insn_buf,
f96da094 6035 struct bpf_prog *prog, u32 *target_size)
61023658
DA		 6036{
6037 struct bpf_insn *insn = insn_buf;
aac3fc32 6038 int off;
61023658 6039
6b8cc1d1 6040 switch (si->off) {
61023658
DA		 6041 case offsetof(struct bpf_sock, bound_dev_if):
6042 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4);
6043
6044 if (type == BPF_WRITE)
6b8cc1d1 6045 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 6046 offsetof(struct sock, sk_bound_dev_if));
6047 else
6b8cc1d1 6048 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 6049 offsetof(struct sock, sk_bound_dev_if));
6050 break;
aa4c1037 6051
482dca93
DA		 6052 case offsetof(struct bpf_sock, mark):
6053 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4);
6054
6055 if (type == BPF_WRITE)
6056 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6057 offsetof(struct sock, sk_mark));
6058 else
6059 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6060 offsetof(struct sock, sk_mark));
6061 break;
6062
6063 case offsetof(struct bpf_sock, priority):
6064 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
6065
6066 if (type == BPF_WRITE)
6067 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6068 offsetof(struct sock, sk_priority));
6069 else
6070 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6071 offsetof(struct sock, sk_priority));
6072 break;
6073
aa4c1037
DA		 6074 case offsetof(struct bpf_sock, family):
6075 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2);
6076
6b8cc1d1 6077 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
aa4c1037
DA		 6078 offsetof(struct sock, sk_family));
6079 break;
6080
6081 case offsetof(struct bpf_sock, type):
6b8cc1d1 6082 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 6083 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 6084 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
6085 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
aa4c1037
DA		 6086 break;
6087
6088 case offsetof(struct bpf_sock, protocol):
6b8cc1d1 6089 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 6090 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 6091 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
6092 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT);
aa4c1037 6093 break;
aac3fc32
AI		 6094
6095 case offsetof(struct bpf_sock, src_ip4):
6096 *insn++ = BPF_LDX_MEM(
6097 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
6098 bpf_target_off(struct sock_common, skc_rcv_saddr,
6099 FIELD_SIZEOF(struct sock_common,
6100 skc_rcv_saddr),
6101 target_size));
6102 break;
6103
6104 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
6105#if IS_ENABLED(CONFIG_IPV6)
6106 off = si->off;
6107 off -= offsetof(struct bpf_sock, src_ip6[0]);
6108 *insn++ = BPF_LDX_MEM(
6109 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
6110 bpf_target_off(
6111 struct sock_common,
6112 skc_v6_rcv_saddr.s6_addr32[0],
6113 FIELD_SIZEOF(struct sock_common,
6114 skc_v6_rcv_saddr.s6_addr32[0]),
6115 target_size) + off);
6116#else
6117 (void)off;
6118 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6119#endif
6120 break;
6121
6122 case offsetof(struct bpf_sock, src_port):
6123 *insn++ = BPF_LDX_MEM(
6124 BPF_FIELD_SIZEOF(struct sock_common, skc_num),
6125 si->dst_reg, si->src_reg,
6126 bpf_target_off(struct sock_common, skc_num,
6127 FIELD_SIZEOF(struct sock_common,
6128 skc_num),
6129 target_size));
6130 break;
61023658
DA		 6131 }
6132
6133 return insn - insn_buf;
6134}
6135
6b8cc1d1
DB		 6136static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
6137 const struct bpf_insn *si,
374fb54e 6138 struct bpf_insn *insn_buf,
f96da094 6139 struct bpf_prog *prog, u32 *target_size)
374fb54e
DB		 6140{
6141 struct bpf_insn *insn = insn_buf;
6142
6b8cc1d1 6143 switch (si->off) {
374fb54e 6144 case offsetof(struct __sk_buff, ifindex):
374fb54e 6145 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 6146 si->dst_reg, si->src_reg,
374fb54e 6147 offsetof(struct sk_buff, dev));
6b8cc1d1 6148 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 6149 bpf_target_off(struct net_device, ifindex, 4,
6150 target_size));
374fb54e
DB		 6151 break;
6152 default:
f96da094
DB		 6153 return bpf_convert_ctx_access(type, si, insn_buf, prog,
6154 target_size);
374fb54e
DB		 6155 }
6156
6157 return insn - insn_buf;
6158}
6159
6b8cc1d1
DB		 6160static u32 xdp_convert_ctx_access(enum bpf_access_type type,
6161 const struct bpf_insn *si,
6a773a15 6162 struct bpf_insn *insn_buf,
f96da094 6163 struct bpf_prog *prog, u32 *target_size)
6a773a15
BB		 6164{
6165 struct bpf_insn *insn = insn_buf;
6166
6b8cc1d1 6167 switch (si->off) {
6a773a15 6168 case offsetof(struct xdp_md, data):
f035a515 6169 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
6b8cc1d1 6170 si->dst_reg, si->src_reg,
6a773a15
BB		 6171 offsetof(struct xdp_buff, data));
6172 break;
de8f3a83
DB		 6173 case offsetof(struct xdp_md, data_meta):
6174 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
6175 si->dst_reg, si->src_reg,
6176 offsetof(struct xdp_buff, data_meta));
6177 break;
6a773a15 6178 case offsetof(struct xdp_md, data_end):
f035a515 6179 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
6b8cc1d1 6180 si->dst_reg, si->src_reg,
6a773a15
BB		 6181 offsetof(struct xdp_buff, data_end));
6182 break;
02dd3291
JDB		 6183 case offsetof(struct xdp_md, ingress_ifindex):
6184 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
6185 si->dst_reg, si->src_reg,
6186 offsetof(struct xdp_buff, rxq));
6187 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
6188 si->dst_reg, si->dst_reg,
6189 offsetof(struct xdp_rxq_info, dev));
6190 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6 6191 offsetof(struct net_device, ifindex));
02dd3291
JDB		 6192 break;
6193 case offsetof(struct xdp_md, rx_queue_index):
6194 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
6195 si->dst_reg, si->src_reg,
6196 offsetof(struct xdp_buff, rxq));
6197 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6
JDB		 6198 offsetof(struct xdp_rxq_info,
6199 queue_index));
02dd3291 6200 break;
6a773a15
BB		 6201 }
6202
6203 return insn - insn_buf;
6204}
6205
4fbac77d
AI		 6206/* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
6207 * context Structure, F is Field in context structure that contains a pointer
6208 * to Nested Structure of type NS that has the field NF.
6209 *
6210 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
6211 * sure that SIZE is not greater than actual size of S.F.NF.
6212 *
6213 * If offset OFF is provided, the load happens from that offset relative to
6214 * offset of NF.
6215 */
6216#define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
6217 do { \
6218 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
6219 si->src_reg, offsetof(S, F)); \
6220 *insn++ = BPF_LDX_MEM( \
6221 SIZE, si->dst_reg, si->dst_reg, \
6222 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6223 target_size) \
6224 + OFF); \
6225 } while (0)
6226
6227#define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
6228 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
6229 BPF_FIELD_SIZEOF(NS, NF), 0)
6230
6231/* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
6232 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
6233 *
6234 * It doesn't support SIZE argument though since narrow stores are not
6235 * supported for now.
6236 *
6237 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
6238 * "register" since two registers available in convert_ctx_access are not
6239 * enough: we can't override neither SRC, since it contains value to store, nor
6240 * DST since it contains pointer to context that may be used by later
6241 * instructions. But we need a temporary place to save pointer to nested
6242 * structure whose field we want to store to.
6243 */
6244#define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, TF) \
6245 do { \
6246 int tmp_reg = BPF_REG_9; \
6247 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6248 --tmp_reg; \
6249 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6250 --tmp_reg; \
6251 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
6252 offsetof(S, TF)); \
6253 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
6254 si->dst_reg, offsetof(S, F)); \
6255 *insn++ = BPF_STX_MEM( \
6256 BPF_FIELD_SIZEOF(NS, NF), tmp_reg, si->src_reg, \
6257 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6258 target_size) \
6259 + OFF); \
6260 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
6261 offsetof(S, TF)); \
6262 } while (0)
6263
6264#define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
6265 TF) \
6266 do { \
6267 if (type == BPF_WRITE) { \
6268 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, \
6269 TF); \
6270 } else { \
6271 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
6272 S, NS, F, NF, SIZE, OFF); \
6273 } \
6274 } while (0)
6275
6276#define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
6277 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
6278 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
6279
6280static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
6281 const struct bpf_insn *si,
6282 struct bpf_insn *insn_buf,
6283 struct bpf_prog *prog, u32 *target_size)
6284{
6285 struct bpf_insn *insn = insn_buf;
6286 int off;
6287
6288 switch (si->off) {
6289 case offsetof(struct bpf_sock_addr, user_family):
6290 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
6291 struct sockaddr, uaddr, sa_family);
6292 break;
6293
6294 case offsetof(struct bpf_sock_addr, user_ip4):
6295 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6296 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
6297 sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
6298 break;
6299
6300 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
6301 off = si->off;
6302 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
6303 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6304 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
6305 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
6306 tmp_reg);
6307 break;
6308
6309 case offsetof(struct bpf_sock_addr, user_port):
6310 /* To get port we need to know sa_family first and then treat
6311 * sockaddr as either sockaddr_in or sockaddr_in6.
6312 * Though we can simplify since port field has same offset and
6313 * size in both structures.
6314 * Here we check this invariant and use just one of the
6315 * structures if it's true.
6316 */
6317 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
6318 offsetof(struct sockaddr_in6, sin6_port));
6319 BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) !=
6320 FIELD_SIZEOF(struct sockaddr_in6, sin6_port));
6321 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern,
6322 struct sockaddr_in6, uaddr,
6323 sin6_port, tmp_reg);
6324 break;
6325
6326 case offsetof(struct bpf_sock_addr, family):
6327 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
6328 struct sock, sk, sk_family);
6329 break;
6330
6331 case offsetof(struct bpf_sock_addr, type):
6332 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
6333 struct bpf_sock_addr_kern, struct sock, sk,
6334 __sk_flags_offset, BPF_W, 0);
6335 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
6336 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
6337 break;
6338
6339 case offsetof(struct bpf_sock_addr, protocol):
6340 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
6341 struct bpf_sock_addr_kern, struct sock, sk,
6342 __sk_flags_offset, BPF_W, 0);
6343 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
6344 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg,
6345 SK_FL_PROTO_SHIFT);
6346 break;
1cedee13
AI		 6347
6348 case offsetof(struct bpf_sock_addr, msg_src_ip4):
6349 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
6350 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6351 struct bpf_sock_addr_kern, struct in_addr, t_ctx,
6352 s_addr, BPF_SIZE(si->code), 0, tmp_reg);
6353 break;
6354
6355 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
6356 msg_src_ip6[3]):
6357 off = si->off;
6358 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
6359 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
6360 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6361 struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
6362 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
6363 break;
4fbac77d
AI		 6364 }
6365
6366 return insn - insn_buf;
6367}
6368
40304b2a
LB		 6369static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
6370 const struct bpf_insn *si,
6371 struct bpf_insn *insn_buf,
f96da094
DB		 6372 struct bpf_prog *prog,
6373 u32 *target_size)
40304b2a
LB		 6374{
6375 struct bpf_insn *insn = insn_buf;
6376 int off;
6377
6378 switch (si->off) {
6379 case offsetof(struct bpf_sock_ops, op) ...
6380 offsetof(struct bpf_sock_ops, replylong[3]):
6381 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
6382 FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
6383 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
6384 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
6385 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
6386 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
6387 off = si->off;
6388 off -= offsetof(struct bpf_sock_ops, op);
6389 off += offsetof(struct bpf_sock_ops_kern, op);
6390 if (type == BPF_WRITE)
6391 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6392 off);
6393 else
6394 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6395 off);
6396 break;
6397
6398 case offsetof(struct bpf_sock_ops, family):
6399 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
6400
6401 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6402 struct bpf_sock_ops_kern, sk),
6403 si->dst_reg, si->src_reg,
6404 offsetof(struct bpf_sock_ops_kern, sk));
6405 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6406 offsetof(struct sock_common, skc_family));
6407 break;
6408
6409 case offsetof(struct bpf_sock_ops, remote_ip4):
6410 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
6411
6412 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6413 struct bpf_sock_ops_kern, sk),
6414 si->dst_reg, si->src_reg,
6415 offsetof(struct bpf_sock_ops_kern, sk));
6416 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6417 offsetof(struct sock_common, skc_daddr));
6418 break;
6419
6420 case offsetof(struct bpf_sock_ops, local_ip4):
303def35
JF		 6421 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6422 skc_rcv_saddr) != 4);
40304b2a
LB		 6423
6424 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6425 struct bpf_sock_ops_kern, sk),
6426 si->dst_reg, si->src_reg,
6427 offsetof(struct bpf_sock_ops_kern, sk));
6428 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6429 offsetof(struct sock_common,
6430 skc_rcv_saddr));
6431 break;
6432
6433 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
6434 offsetof(struct bpf_sock_ops, remote_ip6[3]):
6435#if IS_ENABLED(CONFIG_IPV6)
6436 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6437 skc_v6_daddr.s6_addr32[0]) != 4);
6438
6439 off = si->off;
6440 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
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_W, si->dst_reg, si->dst_reg,
6446 offsetof(struct sock_common,
6447 skc_v6_daddr.s6_addr32[0]) +
6448 off);
6449#else
6450 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6451#endif
6452 break;
6453
6454 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
6455 offsetof(struct bpf_sock_ops, local_ip6[3]):
6456#if IS_ENABLED(CONFIG_IPV6)
6457 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6458 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
6459
6460 off = si->off;
6461 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
6462 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6463 struct bpf_sock_ops_kern, sk),
6464 si->dst_reg, si->src_reg,
6465 offsetof(struct bpf_sock_ops_kern, sk));
6466 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6467 offsetof(struct sock_common,
6468 skc_v6_rcv_saddr.s6_addr32[0]) +
6469 off);
6470#else
6471 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6472#endif
6473 break;
6474
6475 case offsetof(struct bpf_sock_ops, remote_port):
6476 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6477
6478 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6479 struct bpf_sock_ops_kern, sk),
6480 si->dst_reg, si->src_reg,
6481 offsetof(struct bpf_sock_ops_kern, sk));
6482 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6483 offsetof(struct sock_common, skc_dport));
6484#ifndef __BIG_ENDIAN_BITFIELD
6485 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6486#endif
6487 break;
6488
6489 case offsetof(struct bpf_sock_ops, local_port):
6490 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6491
6492 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6493 struct bpf_sock_ops_kern, sk),
6494 si->dst_reg, si->src_reg,
6495 offsetof(struct bpf_sock_ops_kern, sk));
6496 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6497 offsetof(struct sock_common, skc_num));
6498 break;
f19397a5
LB		 6499
6500 case offsetof(struct bpf_sock_ops, is_fullsock):
6501 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6502 struct bpf_sock_ops_kern,
6503 is_fullsock),
6504 si->dst_reg, si->src_reg,
6505 offsetof(struct bpf_sock_ops_kern,
6506 is_fullsock));
6507 break;
6508
44f0e430
LB		 6509 case offsetof(struct bpf_sock_ops, state):
6510 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1);
6511
6512 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6513 struct bpf_sock_ops_kern, sk),
6514 si->dst_reg, si->src_reg,
6515 offsetof(struct bpf_sock_ops_kern, sk));
6516 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
6517 offsetof(struct sock_common, skc_state));
6518 break;
6519
6520 case offsetof(struct bpf_sock_ops, rtt_min):
6521 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) !=
6522 sizeof(struct minmax));
6523 BUILD_BUG_ON(sizeof(struct minmax) <
6524 sizeof(struct minmax_sample));
6525
6526 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6527 struct bpf_sock_ops_kern, sk),
6528 si->dst_reg, si->src_reg,
6529 offsetof(struct bpf_sock_ops_kern, sk));
6530 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6531 offsetof(struct tcp_sock, rtt_min) +
6532 FIELD_SIZEOF(struct minmax_sample, t));
6533 break;
6534
34d367c5
LB		 6535/* Helper macro for adding read access to tcp_sock or sock fields. */
6536#define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
f19397a5 6537 do { \
34d367c5
LB		 6538 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
6539 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
f19397a5
LB		 6540 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6541 struct bpf_sock_ops_kern, \
6542 is_fullsock), \
6543 si->dst_reg, si->src_reg, \
6544 offsetof(struct bpf_sock_ops_kern, \
6545 is_fullsock)); \
6546 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
6547 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6548 struct bpf_sock_ops_kern, sk),\
6549 si->dst_reg, si->src_reg, \
6550 offsetof(struct bpf_sock_ops_kern, sk));\
34d367c5
LB		 6551 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
6552 OBJ_FIELD), \
6553 si->dst_reg, si->dst_reg, \
6554 offsetof(OBJ, OBJ_FIELD)); \
f19397a5
LB		 6555 } while (0)
6556
b73042b8
LB		 6557/* Helper macro for adding write access to tcp_sock or sock fields.
6558 * The macro is called with two registers, dst_reg which contains a pointer
6559 * to ctx (context) and src_reg which contains the value that should be
6560 * stored. However, we need an additional register since we cannot overwrite
6561 * dst_reg because it may be used later in the program.
6562 * Instead we "borrow" one of the other register. We first save its value
6563 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
6564 * it at the end of the macro.
6565 */
6566#define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
6567 do { \
6568 int reg = BPF_REG_9; \
6569 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
6570 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
6571 if (si->dst_reg == reg || si->src_reg == reg) \
6572 reg--; \
6573 if (si->dst_reg == reg || si->src_reg == reg) \
6574 reg--; \
6575 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
6576 offsetof(struct bpf_sock_ops_kern, \
6577 temp)); \
6578 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6579 struct bpf_sock_ops_kern, \
6580 is_fullsock), \
6581 reg, si->dst_reg, \
6582 offsetof(struct bpf_sock_ops_kern, \
6583 is_fullsock)); \
6584 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
6585 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6586 struct bpf_sock_ops_kern, sk),\
6587 reg, si->dst_reg, \
6588 offsetof(struct bpf_sock_ops_kern, sk));\
6589 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
6590 reg, si->src_reg, \
6591 offsetof(OBJ, OBJ_FIELD)); \
6592 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
6593 offsetof(struct bpf_sock_ops_kern, \
6594 temp)); \
6595 } while (0)
6596
6597#define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
6598 do { \
6599 if (TYPE == BPF_WRITE) \
6600 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
6601 else \
6602 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
6603 } while (0)
6604
f19397a5 6605 case offsetof(struct bpf_sock_ops, snd_cwnd):
34d367c5 6606 SOCK_OPS_GET_FIELD(snd_cwnd, snd_cwnd, struct tcp_sock);
f19397a5
LB		 6607 break;
6608
6609 case offsetof(struct bpf_sock_ops, srtt_us):
34d367c5 6610 SOCK_OPS_GET_FIELD(srtt_us, srtt_us, struct tcp_sock);
f19397a5 6611 break;
b13d8807
LB		 6612
6613 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
6614 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
6615 struct tcp_sock);
6616 break;
44f0e430
LB		 6617
6618 case offsetof(struct bpf_sock_ops, snd_ssthresh):
6619 SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock);
6620 break;
6621
6622 case offsetof(struct bpf_sock_ops, rcv_nxt):
6623 SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock);
6624 break;
6625
6626 case offsetof(struct bpf_sock_ops, snd_nxt):
6627 SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock);
6628 break;
6629
6630 case offsetof(struct bpf_sock_ops, snd_una):
6631 SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock);
6632 break;
6633
6634 case offsetof(struct bpf_sock_ops, mss_cache):
6635 SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock);
6636 break;
6637
6638 case offsetof(struct bpf_sock_ops, ecn_flags):
6639 SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock);
6640 break;
6641
6642 case offsetof(struct bpf_sock_ops, rate_delivered):
6643 SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered,
6644 struct tcp_sock);
6645 break;
6646
6647 case offsetof(struct bpf_sock_ops, rate_interval_us):
6648 SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us,
6649 struct tcp_sock);
6650 break;
6651
6652 case offsetof(struct bpf_sock_ops, packets_out):
6653 SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock);
6654 break;
6655
6656 case offsetof(struct bpf_sock_ops, retrans_out):
6657 SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock);
6658 break;
6659
6660 case offsetof(struct bpf_sock_ops, total_retrans):
6661 SOCK_OPS_GET_FIELD(total_retrans, total_retrans,
6662 struct tcp_sock);
6663 break;
6664
6665 case offsetof(struct bpf_sock_ops, segs_in):
6666 SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock);
6667 break;
6668
6669 case offsetof(struct bpf_sock_ops, data_segs_in):
6670 SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock);
6671 break;
6672
6673 case offsetof(struct bpf_sock_ops, segs_out):
6674 SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock);
6675 break;
6676
6677 case offsetof(struct bpf_sock_ops, data_segs_out):
6678 SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out,
6679 struct tcp_sock);
6680 break;
6681
6682 case offsetof(struct bpf_sock_ops, lost_out):
6683 SOCK_OPS_GET_FIELD(lost_out, lost_out, struct tcp_sock);
6684 break;
6685
6686 case offsetof(struct bpf_sock_ops, sacked_out):
6687 SOCK_OPS_GET_FIELD(sacked_out, sacked_out, struct tcp_sock);
6688 break;
6689
6690 case offsetof(struct bpf_sock_ops, sk_txhash):
6f9bd3d7
LB		 6691 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
6692 struct sock, type);
44f0e430
LB		 6693 break;
6694
6695 case offsetof(struct bpf_sock_ops, bytes_received):
6696 SOCK_OPS_GET_FIELD(bytes_received, bytes_received,
6697 struct tcp_sock);
6698 break;
6699
6700 case offsetof(struct bpf_sock_ops, bytes_acked):
6701 SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock);
6702 break;
6f9bd3d7 6703
40304b2a
LB		 6704 }
6705 return insn - insn_buf;
6706}
6707
8108a775
JF		 6708static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
6709 const struct bpf_insn *si,
6710 struct bpf_insn *insn_buf,
6711 struct bpf_prog *prog, u32 *target_size)
6712{
6713 struct bpf_insn *insn = insn_buf;
6714 int off;
6715
6716 switch (si->off) {
6717 case offsetof(struct __sk_buff, data_end):
6718 off = si->off;
6719 off -= offsetof(struct __sk_buff, data_end);
6720 off += offsetof(struct sk_buff, cb);
6721 off += offsetof(struct tcp_skb_cb, bpf.data_end);
6722 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
6723 si->src_reg, off);
6724 break;
6725 default:
6726 return bpf_convert_ctx_access(type, si, insn_buf, prog,
6727 target_size);
6728 }
6729
6730 return insn - insn_buf;
6731}
6732
4f738adb
JF		 6733static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
6734 const struct bpf_insn *si,
6735 struct bpf_insn *insn_buf,
6736 struct bpf_prog *prog, u32 *target_size)
6737{
6738 struct bpf_insn *insn = insn_buf;
720e7f38 6739#if IS_ENABLED(CONFIG_IPV6)
303def35 6740 int off;
720e7f38 6741#endif
4f738adb
JF		 6742
6743 switch (si->off) {
6744 case offsetof(struct sk_msg_md, data):
6745 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_buff, data),
6746 si->dst_reg, si->src_reg,
6747 offsetof(struct sk_msg_buff, data));
6748 break;
6749 case offsetof(struct sk_msg_md, data_end):
6750 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_buff, data_end),
6751 si->dst_reg, si->src_reg,
6752 offsetof(struct sk_msg_buff, data_end));
6753 break;
303def35
JF		 6754 case offsetof(struct sk_msg_md, family):
6755 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
6756
6757 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6758 struct sk_msg_buff, sk),
6759 si->dst_reg, si->src_reg,
6760 offsetof(struct sk_msg_buff, sk));
6761 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6762 offsetof(struct sock_common, skc_family));
6763 break;
6764
6765 case offsetof(struct sk_msg_md, remote_ip4):
6766 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
6767
6768 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6769 struct sk_msg_buff, sk),
6770 si->dst_reg, si->src_reg,
6771 offsetof(struct sk_msg_buff, sk));
6772 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6773 offsetof(struct sock_common, skc_daddr));
6774 break;
6775
6776 case offsetof(struct sk_msg_md, local_ip4):
6777 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6778 skc_rcv_saddr) != 4);
6779
6780 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6781 struct sk_msg_buff, sk),
6782 si->dst_reg, si->src_reg,
6783 offsetof(struct sk_msg_buff, sk));
6784 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6785 offsetof(struct sock_common,
6786 skc_rcv_saddr));
6787 break;
6788
6789 case offsetof(struct sk_msg_md, remote_ip6[0]) ...
6790 offsetof(struct sk_msg_md, remote_ip6[3]):
6791#if IS_ENABLED(CONFIG_IPV6)
6792 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6793 skc_v6_daddr.s6_addr32[0]) != 4);
6794
6795 off = si->off;
6796 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
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_W, si->dst_reg, si->dst_reg,
6802 offsetof(struct sock_common,
6803 skc_v6_daddr.s6_addr32[0]) +
6804 off);
6805#else
6806 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6807#endif
6808 break;
6809
6810 case offsetof(struct sk_msg_md, local_ip6[0]) ...
6811 offsetof(struct sk_msg_md, local_ip6[3]):
6812#if IS_ENABLED(CONFIG_IPV6)
6813 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6814 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
6815
6816 off = si->off;
6817 off -= offsetof(struct sk_msg_md, local_ip6[0]);
6818 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6819 struct sk_msg_buff, sk),
6820 si->dst_reg, si->src_reg,
6821 offsetof(struct sk_msg_buff, sk));
6822 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6823 offsetof(struct sock_common,
6824 skc_v6_rcv_saddr.s6_addr32[0]) +
6825 off);
6826#else
6827 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6828#endif
6829 break;
6830
6831 case offsetof(struct sk_msg_md, remote_port):
6832 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6833
6834 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6835 struct sk_msg_buff, sk),
6836 si->dst_reg, si->src_reg,
6837 offsetof(struct sk_msg_buff, sk));
6838 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6839 offsetof(struct sock_common, skc_dport));
6840#ifndef __BIG_ENDIAN_BITFIELD
6841 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6842#endif
6843 break;
6844
6845 case offsetof(struct sk_msg_md, local_port):
6846 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6847
6848 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6849 struct sk_msg_buff, sk),
6850 si->dst_reg, si->src_reg,
6851 offsetof(struct sk_msg_buff, sk));
6852 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6853 offsetof(struct sock_common, skc_num));
6854 break;
4f738adb
JF		 6855 }
6856
6857 return insn - insn_buf;
6858}
6859
7de16e3a 6860const struct bpf_verifier_ops sk_filter_verifier_ops = {
4936e352
DB		 6861 .get_func_proto = sk_filter_func_proto,
6862 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 6863 .convert_ctx_access = bpf_convert_ctx_access,
e0cea7ce 6864 .gen_ld_abs = bpf_gen_ld_abs,
89aa0758
AS		 6865};
6866
7de16e3a 6867const struct bpf_prog_ops sk_filter_prog_ops = {
61f3c964 6868 .test_run = bpf_prog_test_run_skb,
7de16e3a
JK		 6869};
6870
6871const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
4936e352
DB		 6872 .get_func_proto = tc_cls_act_func_proto,
6873 .is_valid_access = tc_cls_act_is_valid_access,
374fb54e 6874 .convert_ctx_access = tc_cls_act_convert_ctx_access,
36bbef52 6875 .gen_prologue = tc_cls_act_prologue,
e0cea7ce 6876 .gen_ld_abs = bpf_gen_ld_abs,
7de16e3a
JK		 6877};
6878
6879const struct bpf_prog_ops tc_cls_act_prog_ops = {
1cf1cae9 6880 .test_run = bpf_prog_test_run_skb,
608cd71a
AS		 6881};
6882
7de16e3a 6883const struct bpf_verifier_ops xdp_verifier_ops = {
6a773a15
BB		 6884 .get_func_proto = xdp_func_proto,
6885 .is_valid_access = xdp_is_valid_access,
6886 .convert_ctx_access = xdp_convert_ctx_access,
7de16e3a
JK		 6887};
6888
6889const struct bpf_prog_ops xdp_prog_ops = {
1cf1cae9 6890 .test_run = bpf_prog_test_run_xdp,
6a773a15
BB		 6891};
6892
7de16e3a 6893const struct bpf_verifier_ops cg_skb_verifier_ops = {
cd339431 6894 .get_func_proto = cg_skb_func_proto,
0e33661d 6895 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 6896 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 6897};
6898
6899const struct bpf_prog_ops cg_skb_prog_ops = {
1cf1cae9 6900 .test_run = bpf_prog_test_run_skb,
0e33661d
DM		 6901};
6902
cd3092c7
MX		 6903const struct bpf_verifier_ops lwt_in_verifier_ops = {
6904 .get_func_proto = lwt_in_func_proto,
3a0af8fd 6905 .is_valid_access = lwt_is_valid_access,
2492d3b8 6906 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 6907};
6908
cd3092c7
MX		 6909const struct bpf_prog_ops lwt_in_prog_ops = {
6910 .test_run = bpf_prog_test_run_skb,
6911};
6912
6913const struct bpf_verifier_ops lwt_out_verifier_ops = {
6914 .get_func_proto = lwt_out_func_proto,
3a0af8fd 6915 .is_valid_access = lwt_is_valid_access,
2492d3b8 6916 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 6917};
6918
cd3092c7 6919const struct bpf_prog_ops lwt_out_prog_ops = {
1cf1cae9 6920 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 6921};
6922
7de16e3a 6923const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
3a0af8fd
TG		 6924 .get_func_proto = lwt_xmit_func_proto,
6925 .is_valid_access = lwt_is_valid_access,
2492d3b8 6926 .convert_ctx_access = bpf_convert_ctx_access,
3a0af8fd 6927 .gen_prologue = tc_cls_act_prologue,
7de16e3a
JK		 6928};
6929
6930const struct bpf_prog_ops lwt_xmit_prog_ops = {
1cf1cae9 6931 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 6932};
6933
004d4b27
MX		 6934const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
6935 .get_func_proto = lwt_seg6local_func_proto,
6936 .is_valid_access = lwt_is_valid_access,
6937 .convert_ctx_access = bpf_convert_ctx_access,
6938};
6939
6940const struct bpf_prog_ops lwt_seg6local_prog_ops = {
6941 .test_run = bpf_prog_test_run_skb,
6942};
6943
7de16e3a 6944const struct bpf_verifier_ops cg_sock_verifier_ops = {
ae2cf1c4 6945 .get_func_proto = sock_filter_func_proto,
61023658
DA		 6946 .is_valid_access = sock_filter_is_valid_access,
6947 .convert_ctx_access = sock_filter_convert_ctx_access,
6948};
6949
7de16e3a
JK		 6950const struct bpf_prog_ops cg_sock_prog_ops = {
6951};
6952
4fbac77d
AI		 6953const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
6954 .get_func_proto = sock_addr_func_proto,
6955 .is_valid_access = sock_addr_is_valid_access,
6956 .convert_ctx_access = sock_addr_convert_ctx_access,
6957};
6958
6959const struct bpf_prog_ops cg_sock_addr_prog_ops = {
6960};
6961
7de16e3a 6962const struct bpf_verifier_ops sock_ops_verifier_ops = {
8c4b4c7e 6963 .get_func_proto = sock_ops_func_proto,
40304b2a
LB		 6964 .is_valid_access = sock_ops_is_valid_access,
6965 .convert_ctx_access = sock_ops_convert_ctx_access,
6966};
6967
7de16e3a
JK		 6968const struct bpf_prog_ops sock_ops_prog_ops = {
6969};
6970
6971const struct bpf_verifier_ops sk_skb_verifier_ops = {
b005fd18
JF		 6972 .get_func_proto = sk_skb_func_proto,
6973 .is_valid_access = sk_skb_is_valid_access,
8108a775 6974 .convert_ctx_access = sk_skb_convert_ctx_access,
8a31db56 6975 .gen_prologue = sk_skb_prologue,
b005fd18
JF		 6976};
6977
7de16e3a
JK		 6978const struct bpf_prog_ops sk_skb_prog_ops = {
6979};
6980
4f738adb
JF		 6981const struct bpf_verifier_ops sk_msg_verifier_ops = {
6982 .get_func_proto = sk_msg_func_proto,
6983 .is_valid_access = sk_msg_is_valid_access,
6984 .convert_ctx_access = sk_msg_convert_ctx_access,
6985};
6986
6987const struct bpf_prog_ops sk_msg_prog_ops = {
6988};
6989
8ced425e 6990int sk_detach_filter(struct sock *sk)
55b33325
PE		 6991{
6992 int ret = -ENOENT;
6993 struct sk_filter *filter;
6994
d59577b6
VB		 6995 if (sock_flag(sk, SOCK_FILTER_LOCKED))
6996 return -EPERM;
6997
8ced425e
HFS		 6998 filter = rcu_dereference_protected(sk->sk_filter,
6999 lockdep_sock_is_held(sk));
55b33325 7000 if (filter) {
a9b3cd7f 7001 RCU_INIT_POINTER(sk->sk_filter, NULL);
46bcf14f 7002 sk_filter_uncharge(sk, filter);
55b33325
PE		 7003 ret = 0;
7004 }
a3ea269b 7005
55b33325
PE		 7006 return ret;
7007}
8ced425e 7008EXPORT_SYMBOL_GPL(sk_detach_filter);
a8fc9277 7009
a3ea269b
DB		 7010int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
7011 unsigned int len)
a8fc9277 7012{
a3ea269b 7013 struct sock_fprog_kern *fprog;
a8fc9277 7014 struct sk_filter *filter;
a3ea269b 7015 int ret = 0;
a8fc9277
PE		 7016
7017 lock_sock(sk);
7018 filter = rcu_dereference_protected(sk->sk_filter,
8ced425e 7019 lockdep_sock_is_held(sk));
a8fc9277
PE		 7020 if (!filter)
7021 goto out;
a3ea269b
DB		 7022
7023 /* We're copying the filter that has been originally attached,
93d08b69
DB		 7024 * so no conversion/decode needed anymore. eBPF programs that
7025 * have no original program cannot be dumped through this.
a3ea269b 7026 */
93d08b69 7027 ret = -EACCES;
7ae457c1 7028 fprog = filter->prog->orig_prog;
93d08b69
DB		 7029 if (!fprog)
7030 goto out;
a3ea269b
DB		 7031
7032 ret = fprog->len;
a8fc9277 7033 if (!len)
a3ea269b 7034 /* User space only enquires number of filter blocks. */
a8fc9277 7035 goto out;
a3ea269b 7036
a8fc9277 7037 ret = -EINVAL;
a3ea269b 7038 if (len < fprog->len)
a8fc9277
PE		 7039 goto out;
7040
7041 ret = -EFAULT;
009937e7 7042 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
a3ea269b 7043 goto out;
a8fc9277 7044
a3ea269b
DB		 7045 /* Instead of bytes, the API requests to return the number
7046 * of filter blocks.
7047 */
7048 ret = fprog->len;
a8fc9277
PE		 7049out:
7050 release_sock(sk);
7051 return ret;
7052}
2dbb9b9e
MKL		 7053
7054#ifdef CONFIG_INET
7055struct sk_reuseport_kern {
7056 struct sk_buff *skb;
7057 struct sock *sk;
7058 struct sock *selected_sk;
7059 void *data_end;
7060 u32 hash;
7061 u32 reuseport_id;
7062 bool bind_inany;
7063};
7064
7065static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
7066 struct sock_reuseport *reuse,
7067 struct sock *sk, struct sk_buff *skb,
7068 u32 hash)
7069{
7070 reuse_kern->skb = skb;
7071 reuse_kern->sk = sk;
7072 reuse_kern->selected_sk = NULL;
7073 reuse_kern->data_end = skb->data + skb_headlen(skb);
7074 reuse_kern->hash = hash;
7075 reuse_kern->reuseport_id = reuse->reuseport_id;
7076 reuse_kern->bind_inany = reuse->bind_inany;
7077}
7078
7079struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
7080 struct bpf_prog *prog, struct sk_buff *skb,
7081 u32 hash)
7082{
7083 struct sk_reuseport_kern reuse_kern;
7084 enum sk_action action;
7085
7086 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash);
7087 action = BPF_PROG_RUN(prog, &reuse_kern);
7088
7089 if (action == SK_PASS)
7090 return reuse_kern.selected_sk;
7091 else
7092 return ERR_PTR(-ECONNREFUSED);
7093}
7094
7095BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
7096 struct bpf_map *, map, void *, key, u32, flags)
7097{
7098 struct sock_reuseport *reuse;
7099 struct sock *selected_sk;
7100
7101 selected_sk = map->ops->map_lookup_elem(map, key);
7102 if (!selected_sk)
7103 return -ENOENT;
7104
7105 reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
7106 if (!reuse)
7107 /* selected_sk is unhashed (e.g. by close()) after the
7108 * above map_lookup_elem(). Treat selected_sk has already
7109 * been removed from the map.
7110 */
7111 return -ENOENT;
7112
7113 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
7114 struct sock *sk;
7115
7116 if (unlikely(!reuse_kern->reuseport_id))
7117 /* There is a small race between adding the
7118 * sk to the map and setting the
7119 * reuse_kern->reuseport_id.
7120 * Treat it as the sk has not been added to
7121 * the bpf map yet.
7122 */
7123 return -ENOENT;
7124
7125 sk = reuse_kern->sk;
7126 if (sk->sk_protocol != selected_sk->sk_protocol)
7127 return -EPROTOTYPE;
7128 else if (sk->sk_family != selected_sk->sk_family)
7129 return -EAFNOSUPPORT;
7130
7131 /* Catch all. Likely bound to a different sockaddr. */
7132 return -EBADFD;
7133 }
7134
7135 reuse_kern->selected_sk = selected_sk;
7136
7137 return 0;
7138}
7139
7140static const struct bpf_func_proto sk_select_reuseport_proto = {
7141 .func = sk_select_reuseport,
7142 .gpl_only = false,
7143 .ret_type = RET_INTEGER,
7144 .arg1_type = ARG_PTR_TO_CTX,
7145 .arg2_type = ARG_CONST_MAP_PTR,
7146 .arg3_type = ARG_PTR_TO_MAP_KEY,
7147 .arg4_type = ARG_ANYTHING,
7148};
7149
7150BPF_CALL_4(sk_reuseport_load_bytes,
7151 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
7152 void *, to, u32, len)
7153{
7154 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
7155}
7156
7157static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
7158 .func = sk_reuseport_load_bytes,
7159 .gpl_only = false,
7160 .ret_type = RET_INTEGER,
7161 .arg1_type = ARG_PTR_TO_CTX,
7162 .arg2_type = ARG_ANYTHING,
7163 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
7164 .arg4_type = ARG_CONST_SIZE,
7165};
7166
7167BPF_CALL_5(sk_reuseport_load_bytes_relative,
7168 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
7169 void *, to, u32, len, u32, start_header)
7170{
7171 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
7172 len, start_header);
7173}
7174
7175static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
7176 .func = sk_reuseport_load_bytes_relative,
7177 .gpl_only = false,
7178 .ret_type = RET_INTEGER,
7179 .arg1_type = ARG_PTR_TO_CTX,
7180 .arg2_type = ARG_ANYTHING,
7181 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
7182 .arg4_type = ARG_CONST_SIZE,
7183 .arg5_type = ARG_ANYTHING,
7184};
7185
7186static const struct bpf_func_proto *
7187sk_reuseport_func_proto(enum bpf_func_id func_id,
7188 const struct bpf_prog *prog)
7189{
7190 switch (func_id) {
7191 case BPF_FUNC_sk_select_reuseport:
7192 return &sk_select_reuseport_proto;
7193 case BPF_FUNC_skb_load_bytes:
7194 return &sk_reuseport_load_bytes_proto;
7195 case BPF_FUNC_skb_load_bytes_relative:
7196 return &sk_reuseport_load_bytes_relative_proto;
7197 default:
7198 return bpf_base_func_proto(func_id);
7199 }
7200}
7201
7202static bool
7203sk_reuseport_is_valid_access(int off, int size,
7204 enum bpf_access_type type,
7205 const struct bpf_prog *prog,
7206 struct bpf_insn_access_aux *info)
7207{
7208 const u32 size_default = sizeof(__u32);
7209
7210 if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
7211 off % size || type != BPF_READ)
7212 return false;
7213
7214 switch (off) {
7215 case offsetof(struct sk_reuseport_md, data):
7216 info->reg_type = PTR_TO_PACKET;
7217 return size == sizeof(__u64);
7218
7219 case offsetof(struct sk_reuseport_md, data_end):
7220 info->reg_type = PTR_TO_PACKET_END;
7221 return size == sizeof(__u64);
7222
7223 case offsetof(struct sk_reuseport_md, hash):
7224 return size == size_default;
7225
7226 /* Fields that allow narrowing */
7227 case offsetof(struct sk_reuseport_md, eth_protocol):
7228 if (size < FIELD_SIZEOF(struct sk_buff, protocol))
7229 return false;
4597b62f 7230 /* fall through */
2dbb9b9e
MKL		 7231 case offsetof(struct sk_reuseport_md, ip_protocol):
7232 case offsetof(struct sk_reuseport_md, bind_inany):
7233 case offsetof(struct sk_reuseport_md, len):
7234 bpf_ctx_record_field_size(info, size_default);
7235 return bpf_ctx_narrow_access_ok(off, size, size_default);
7236
7237 default:
7238 return false;
7239 }
7240}
7241
7242#define SK_REUSEPORT_LOAD_FIELD(F) ({ \
7243 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7244 si->dst_reg, si->src_reg, \
7245 bpf_target_off(struct sk_reuseport_kern, F, \
7246 FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7247 target_size)); \
7248 })
7249
7250#define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
7251 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
7252 struct sk_buff, \
7253 skb, \
7254 SKB_FIELD)
7255
7256#define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \
7257 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \
7258 struct sock, \
7259 sk, \
7260 SK_FIELD, BPF_SIZE, EXTRA_OFF)
7261
7262static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
7263 const struct bpf_insn *si,
7264 struct bpf_insn *insn_buf,
7265 struct bpf_prog *prog,
7266 u32 *target_size)
7267{
7268 struct bpf_insn *insn = insn_buf;
7269
7270 switch (si->off) {
7271 case offsetof(struct sk_reuseport_md, data):
7272 SK_REUSEPORT_LOAD_SKB_FIELD(data);
7273 break;
7274
7275 case offsetof(struct sk_reuseport_md, len):
7276 SK_REUSEPORT_LOAD_SKB_FIELD(len);
7277 break;
7278
7279 case offsetof(struct sk_reuseport_md, eth_protocol):
7280 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
7281 break;
7282
7283 case offsetof(struct sk_reuseport_md, ip_protocol):
7284 BUILD_BUG_ON(hweight_long(SK_FL_PROTO_MASK) != BITS_PER_BYTE);
7285 SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset,
7286 BPF_W, 0);
7287 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
7288 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg,
7289 SK_FL_PROTO_SHIFT);
7290 /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian
7291 * aware. No further narrowing or masking is needed.
7292 */
7293 *target_size = 1;
7294 break;
7295
7296 case offsetof(struct sk_reuseport_md, data_end):
7297 SK_REUSEPORT_LOAD_FIELD(data_end);
7298 break;
7299
7300 case offsetof(struct sk_reuseport_md, hash):
7301 SK_REUSEPORT_LOAD_FIELD(hash);
7302 break;
7303
7304 case offsetof(struct sk_reuseport_md, bind_inany):
7305 SK_REUSEPORT_LOAD_FIELD(bind_inany);
7306 break;
7307 }
7308
7309 return insn - insn_buf;
7310}
7311
7312const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
7313 .get_func_proto = sk_reuseport_func_proto,
7314 .is_valid_access = sk_reuseport_is_valid_access,
7315 .convert_ctx_access = sk_reuseport_convert_ctx_access,
7316};
7317
7318const struct bpf_prog_ops sk_reuseport_prog_ops = {
7319};
7320#endif /* CONFIG_INET */
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