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bpf, sockmap: convert to generic sk_msg interface
[linux-2.6-block.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 40#include <linux/skbuff.h>
604326b4 41#include <linux/skmsg.h>
1da177e4 42#include <net/sock.h>
10b89ee4 43#include <net/flow_dissector.h>
1da177e4
LT		 44#include <linux/errno.h>
45#include <linux/timer.h>
7c0f6ba6 46#include <linux/uaccess.h>
40daafc8 47#include <asm/unaligned.h>
d66f2b91 48#include <asm/cmpxchg.h>
1da177e4 49#include <linux/filter.h>
86e4ca66 50#include <linux/ratelimit.h>
46b325c7 51#include <linux/seccomp.h>
f3335031 52#include <linux/if_vlan.h>
89aa0758 53#include <linux/bpf.h>
d691f9e8 54#include <net/sch_generic.h>
8d20aabe 55#include <net/cls_cgroup.h>
d3aa45ce 56#include <net/dst_metadata.h>
c46646d0 57#include <net/dst.h>
538950a1 58#include <net/sock_reuseport.h>
b1d9fc41 59#include <net/busy_poll.h>
8c4b4c7e 60#include <net/tcp.h>
12bed760 61#include <net/xfrm.h>
6acc9b43 62#include <net/udp.h>
5acaee0a 63#include <linux/bpf_trace.h>
02671e23 64#include <net/xdp_sock.h>
87f5fc7e 65#include <linux/inetdevice.h>
6acc9b43
JS		 66#include <net/inet_hashtables.h>
67#include <net/inet6_hashtables.h>
87f5fc7e
DA		 68#include <net/ip_fib.h>
69#include <net/flow.h>
70#include <net/arp.h>
fe94cc29 71#include <net/ipv6.h>
6acc9b43 72#include <net/net_namespace.h>
fe94cc29
MX		 73#include <linux/seg6_local.h>
74#include <net/seg6.h>
75#include <net/seg6_local.h>
1da177e4 76
43db6d65 77/**
f4979fce 78 * sk_filter_trim_cap - run a packet through a socket filter
43db6d65
SH		 79 * @sk: sock associated with &sk_buff
80 * @skb: buffer to filter
f4979fce 81 * @cap: limit on how short the eBPF program may trim the packet
43db6d65 82 *
ff936a04
AS		 83 * Run the eBPF program and then cut skb->data to correct size returned by
84 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
43db6d65 85 * than pkt_len we keep whole skb->data. This is the socket level
ff936a04 86 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
43db6d65
SH		 87 * be accepted or -EPERM if the packet should be tossed.
88 *
89 */
f4979fce 90int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
43db6d65
SH		 91{
92 int err;
93 struct sk_filter *filter;
94
c93bdd0e
MG		 95 /*
96 * If the skb was allocated from pfmemalloc reserves, only
97 * allow SOCK_MEMALLOC sockets to use it as this socket is
98 * helping free memory
99 */
8fe809a9
ED		 100 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
101 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
c93bdd0e 102 return -ENOMEM;
8fe809a9 103 }
c11cd3a6
DM		 104 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
105 if (err)
106 return err;
107
43db6d65
SH		 108 err = security_sock_rcv_skb(sk, skb);
109 if (err)
110 return err;
111
80f8f102
ED		 112 rcu_read_lock();
113 filter = rcu_dereference(sk->sk_filter);
43db6d65 114 if (filter) {
8f917bba
WB		 115 struct sock *save_sk = skb->sk;
116 unsigned int pkt_len;
117
118 skb->sk = sk;
119 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
8f917bba 120 skb->sk = save_sk;
d1f496fd 121 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
43db6d65 122 }
80f8f102 123 rcu_read_unlock();
43db6d65
SH		 124
125 return err;
126}
f4979fce 127EXPORT_SYMBOL(sk_filter_trim_cap);
43db6d65 128
b390134c 129BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb)
bd4cf0ed 130{
f3694e00 131 return skb_get_poff(skb);
bd4cf0ed
AS		 132}
133
b390134c 134BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
bd4cf0ed 135{
bd4cf0ed
AS		 136 struct nlattr *nla;
137
138 if (skb_is_nonlinear(skb))
139 return 0;
140
05ab8f26
MK		 141 if (skb->len < sizeof(struct nlattr))
142 return 0;
143
30743837 144 if (a > skb->len - sizeof(struct nlattr))
bd4cf0ed
AS		 145 return 0;
146
30743837 147 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
bd4cf0ed
AS		 148 if (nla)
149 return (void *) nla - (void *) skb->data;
150
151 return 0;
152}
153
b390134c 154BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
bd4cf0ed 155{
bd4cf0ed
AS		 156 struct nlattr *nla;
157
158 if (skb_is_nonlinear(skb))
159 return 0;
160
05ab8f26
MK		 161 if (skb->len < sizeof(struct nlattr))
162 return 0;
163
30743837 164 if (a > skb->len - sizeof(struct nlattr))
bd4cf0ed
AS		 165 return 0;
166
30743837
DB		 167 nla = (struct nlattr *) &skb->data[a];
168 if (nla->nla_len > skb->len - a)
bd4cf0ed
AS		 169 return 0;
170
30743837 171 nla = nla_find_nested(nla, x);
bd4cf0ed
AS		 172 if (nla)
173 return (void *) nla - (void *) skb->data;
174
175 return 0;
176}
177
e0cea7ce
DB		 178BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
179 data, int, headlen, int, offset)
180{
181 u8 tmp, *ptr;
182 const int len = sizeof(tmp);
183
184 if (offset >= 0) {
185 if (headlen - offset >= len)
186 return *(u8 *)(data + offset);
187 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
188 return tmp;
189 } else {
190 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
191 if (likely(ptr))
192 return *(u8 *)ptr;
193 }
194
195 return -EFAULT;
196}
197
198BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
199 int, offset)
200{
201 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
202 offset);
203}
204
205BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
206 data, int, headlen, int, offset)
207{
208 u16 tmp, *ptr;
209 const int len = sizeof(tmp);
210
211 if (offset >= 0) {
212 if (headlen - offset >= len)
213 return get_unaligned_be16(data + offset);
214 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
215 return be16_to_cpu(tmp);
216 } else {
217 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
218 if (likely(ptr))
219 return get_unaligned_be16(ptr);
220 }
221
222 return -EFAULT;
223}
224
225BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
226 int, offset)
227{
228 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
229 offset);
230}
231
232BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
233 data, int, headlen, int, offset)
234{
235 u32 tmp, *ptr;
236 const int len = sizeof(tmp);
237
238 if (likely(offset >= 0)) {
239 if (headlen - offset >= len)
240 return get_unaligned_be32(data + offset);
241 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
242 return be32_to_cpu(tmp);
243 } else {
244 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
245 if (likely(ptr))
246 return get_unaligned_be32(ptr);
247 }
248
249 return -EFAULT;
250}
251
252BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
253 int, offset)
254{
255 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
256 offset);
257}
258
b390134c 259BPF_CALL_0(bpf_get_raw_cpu_id)
bd4cf0ed
AS		 260{
261 return raw_smp_processor_id();
262}
263
80b48c44 264static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
b390134c 265 .func = bpf_get_raw_cpu_id,
80b48c44
DB		 266 .gpl_only = false,
267 .ret_type = RET_INTEGER,
268};
269
9bac3d6d
AS		 270static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
271 struct bpf_insn *insn_buf)
272{
273 struct bpf_insn *insn = insn_buf;
274
275 switch (skb_field) {
276 case SKF_AD_MARK:
277 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4);
278
279 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
280 offsetof(struct sk_buff, mark));
281 break;
282
283 case SKF_AD_PKTTYPE:
284 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
285 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
286#ifdef __BIG_ENDIAN_BITFIELD
287 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
288#endif
289 break;
290
291 case SKF_AD_QUEUE:
292 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2);
293
294 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
295 offsetof(struct sk_buff, queue_mapping));
296 break;
c2497395 297
c2497395
AS		 298 case SKF_AD_VLAN_TAG:
299 case SKF_AD_VLAN_TAG_PRESENT:
300 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
301 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
302
303 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
304 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
305 offsetof(struct sk_buff, vlan_tci));
306 if (skb_field == SKF_AD_VLAN_TAG) {
307 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg,
308 ~VLAN_TAG_PRESENT);
309 } else {
310 /* dst_reg >>= 12 */
311 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12);
312 /* dst_reg &= 1 */
313 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
314 }
315 break;
9bac3d6d
AS		 316 }
317
318 return insn - insn_buf;
319}
320
bd4cf0ed 321static bool convert_bpf_extensions(struct sock_filter *fp,
2695fb55 322 struct bpf_insn **insnp)
bd4cf0ed 323{
2695fb55 324 struct bpf_insn *insn = *insnp;
9bac3d6d 325 u32 cnt;
bd4cf0ed
AS		 326
327 switch (fp->k) {
328 case SKF_AD_OFF + SKF_AD_PROTOCOL:
0b8c707d
DB		 329 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2);
330
331 /* A = *(u16 *) (CTX + offsetof(protocol)) */
332 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
333 offsetof(struct sk_buff, protocol));
334 /* A = ntohs(A) [emitting a nop or swap16] */
335 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
bd4cf0ed
AS		 336 break;
337
338 case SKF_AD_OFF + SKF_AD_PKTTYPE:
9bac3d6d
AS		 339 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
340 insn += cnt - 1;
bd4cf0ed
AS		 341 break;
342
343 case SKF_AD_OFF + SKF_AD_IFINDEX:
344 case SKF_AD_OFF + SKF_AD_HATYPE:
bd4cf0ed
AS		 345 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4);
346 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2);
f8f6d679 347
f035a515 348 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
f8f6d679
DB		 349 BPF_REG_TMP, BPF_REG_CTX,
350 offsetof(struct sk_buff, dev));
351 /* if (tmp != 0) goto pc + 1 */
352 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
353 *insn++ = BPF_EXIT_INSN();
354 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
355 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
356 offsetof(struct net_device, ifindex));
357 else
358 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
359 offsetof(struct net_device, type));
bd4cf0ed
AS		 360 break;
361
362 case SKF_AD_OFF + SKF_AD_MARK:
9bac3d6d
AS		 363 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
364 insn += cnt - 1;
bd4cf0ed
AS		 365 break;
366
367 case SKF_AD_OFF + SKF_AD_RXHASH:
368 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4);
369
9739eef1
AS		 370 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
371 offsetof(struct sk_buff, hash));
bd4cf0ed
AS		 372 break;
373
374 case SKF_AD_OFF + SKF_AD_QUEUE:
9bac3d6d
AS		 375 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
376 insn += cnt - 1;
bd4cf0ed
AS		 377 break;
378
379 case SKF_AD_OFF + SKF_AD_VLAN_TAG:
c2497395
AS		 380 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
381 BPF_REG_A, BPF_REG_CTX, insn);
382 insn += cnt - 1;
383 break;
bd4cf0ed 384
c2497395
AS		 385 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
386 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
387 BPF_REG_A, BPF_REG_CTX, insn);
388 insn += cnt - 1;
bd4cf0ed
AS		 389 break;
390
27cd5452
MS		 391 case SKF_AD_OFF + SKF_AD_VLAN_TPID:
392 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2);
393
394 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
395 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
396 offsetof(struct sk_buff, vlan_proto));
397 /* A = ntohs(A) [emitting a nop or swap16] */
398 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
399 break;
400
bd4cf0ed
AS		 401 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
402 case SKF_AD_OFF + SKF_AD_NLATTR:
403 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
404 case SKF_AD_OFF + SKF_AD_CPU:
4cd3675e 405 case SKF_AD_OFF + SKF_AD_RANDOM:
e430f34e 406 /* arg1 = CTX */
f8f6d679 407 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
bd4cf0ed 408 /* arg2 = A */
f8f6d679 409 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
bd4cf0ed 410 /* arg3 = X */
f8f6d679 411 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
e430f34e 412 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
bd4cf0ed
AS		 413 switch (fp->k) {
414 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
b390134c 415 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset);
bd4cf0ed
AS		 416 break;
417 case SKF_AD_OFF + SKF_AD_NLATTR:
b390134c 418 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr);
bd4cf0ed
AS		 419 break;
420 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
b390134c 421 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest);
bd4cf0ed
AS		 422 break;
423 case SKF_AD_OFF + SKF_AD_CPU:
b390134c 424 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id);
bd4cf0ed 425 break;
4cd3675e 426 case SKF_AD_OFF + SKF_AD_RANDOM:
3ad00405
DB		 427 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
428 bpf_user_rnd_init_once();
4cd3675e 429 break;
bd4cf0ed
AS		 430 }
431 break;
432
433 case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
9739eef1
AS		 434 /* A ^= X */
435 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
bd4cf0ed
AS		 436 break;
437
438 default:
439 /* This is just a dummy call to avoid letting the compiler
440 * evict __bpf_call_base() as an optimization. Placed here
441 * where no-one bothers.
442 */
443 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
444 return false;
445 }
446
447 *insnp = insn;
448 return true;
449}
450
e0cea7ce
DB		 451static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
452{
453 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
454 int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
455 bool endian = BPF_SIZE(fp->code) == BPF_H ||
456 BPF_SIZE(fp->code) == BPF_W;
457 bool indirect = BPF_MODE(fp->code) == BPF_IND;
458 const int ip_align = NET_IP_ALIGN;
459 struct bpf_insn *insn = *insnp;
460 int offset = fp->k;
461
462 if (!indirect &&
463 ((unaligned_ok && offset >= 0) ||
464 (!unaligned_ok && offset >= 0 &&
465 offset + ip_align >= 0 &&
466 offset + ip_align % size == 0))) {
59ee4129
DB		 467 bool ldx_off_ok = offset <= S16_MAX;
468
e0cea7ce
DB		 469 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
470 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
59ee4129
DB		 471 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP,
472 size, 2 + endian + (!ldx_off_ok * 2));
473 if (ldx_off_ok) {
474 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
475 BPF_REG_D, offset);
476 } else {
477 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D);
478 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset);
479 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
480 BPF_REG_TMP, 0);
481 }
e0cea7ce
DB		 482 if (endian)
483 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
484 *insn++ = BPF_JMP_A(8);
485 }
486
487 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
488 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
489 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
490 if (!indirect) {
491 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
492 } else {
493 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
494 if (fp->k)
495 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
496 }
497
498 switch (BPF_SIZE(fp->code)) {
499 case BPF_B:
500 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
501 break;
502 case BPF_H:
503 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
504 break;
505 case BPF_W:
506 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
507 break;
508 default:
509 return false;
510 }
511
512 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
513 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
514 *insn = BPF_EXIT_INSN();
515
516 *insnp = insn;
517 return true;
518}
519
bd4cf0ed 520/**
8fb575ca 521 * bpf_convert_filter - convert filter program
bd4cf0ed
AS		 522 * @prog: the user passed filter program
523 * @len: the length of the user passed filter program
50bbfed9 524 * @new_prog: allocated 'struct bpf_prog' or NULL
bd4cf0ed 525 * @new_len: pointer to store length of converted program
e0cea7ce 526 * @seen_ld_abs: bool whether we've seen ld_abs/ind
bd4cf0ed 527 *
1f504ec9
TK		 528 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
529 * style extended BPF (eBPF).
bd4cf0ed
AS		 530 * Conversion workflow:
531 *
532 * 1) First pass for calculating the new program length:
e0cea7ce 533 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
bd4cf0ed
AS		 534 *
535 * 2) 2nd pass to remap in two passes: 1st pass finds new
536 * jump offsets, 2nd pass remapping:
e0cea7ce 537 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
bd4cf0ed 538 */
d9e12f42 539static int bpf_convert_filter(struct sock_filter *prog, int len,
e0cea7ce
DB		 540 struct bpf_prog *new_prog, int *new_len,
541 bool *seen_ld_abs)
bd4cf0ed 542{
50bbfed9
AS		 543 int new_flen = 0, pass = 0, target, i, stack_off;
544 struct bpf_insn *new_insn, *first_insn = NULL;
bd4cf0ed
AS		 545 struct sock_filter *fp;
546 int *addrs = NULL;
547 u8 bpf_src;
548
549 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
30743837 550 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
bd4cf0ed 551
6f9a093b 552 if (len <= 0 || len > BPF_MAXINSNS)
bd4cf0ed
AS		 553 return -EINVAL;
554
555 if (new_prog) {
50bbfed9 556 first_insn = new_prog->insnsi;
658da937
DB		 557 addrs = kcalloc(len, sizeof(*addrs),
558 GFP_KERNEL | __GFP_NOWARN);
bd4cf0ed
AS		 559 if (!addrs)
560 return -ENOMEM;
561 }
562
563do_pass:
50bbfed9 564 new_insn = first_insn;
bd4cf0ed
AS		 565 fp = prog;
566
8b614aeb 567 /* Classic BPF related prologue emission. */
50bbfed9 568 if (new_prog) {
8b614aeb
DB		 569 /* Classic BPF expects A and X to be reset first. These need
570 * to be guaranteed to be the first two instructions.
571 */
1d621674
DB		 572 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
573 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
8b614aeb
DB		 574
575 /* All programs must keep CTX in callee saved BPF_REG_CTX.
576 * In eBPF case it's done by the compiler, here we need to
577 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
578 */
579 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
e0cea7ce
DB		 580 if (*seen_ld_abs) {
581 /* For packet access in classic BPF, cache skb->data
582 * in callee-saved BPF R8 and skb->len - skb->data_len
583 * (headlen) in BPF R9. Since classic BPF is read-only
584 * on CTX, we only need to cache it once.
585 */
586 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
587 BPF_REG_D, BPF_REG_CTX,
588 offsetof(struct sk_buff, data));
589 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
590 offsetof(struct sk_buff, len));
591 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
592 offsetof(struct sk_buff, data_len));
593 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
594 }
8b614aeb
DB		 595 } else {
596 new_insn += 3;
597 }
bd4cf0ed
AS		 598
599 for (i = 0; i < len; fp++, i++) {
e0cea7ce 600 struct bpf_insn tmp_insns[32] = { };
2695fb55 601 struct bpf_insn *insn = tmp_insns;
bd4cf0ed
AS		 602
603 if (addrs)
50bbfed9 604 addrs[i] = new_insn - first_insn;
bd4cf0ed
AS		 605
606 switch (fp->code) {
607 /* All arithmetic insns and skb loads map as-is. */
608 case BPF_ALU | BPF_ADD | BPF_X:
609 case BPF_ALU | BPF_ADD | BPF_K:
610 case BPF_ALU | BPF_SUB | BPF_X:
611 case BPF_ALU | BPF_SUB | BPF_K:
612 case BPF_ALU | BPF_AND | BPF_X:
613 case BPF_ALU | BPF_AND | BPF_K:
614 case BPF_ALU | BPF_OR | BPF_X:
615 case BPF_ALU | BPF_OR | BPF_K:
616 case BPF_ALU | BPF_LSH | BPF_X:
617 case BPF_ALU | BPF_LSH | BPF_K:
618 case BPF_ALU | BPF_RSH | BPF_X:
619 case BPF_ALU | BPF_RSH | BPF_K:
620 case BPF_ALU | BPF_XOR | BPF_X:
621 case BPF_ALU | BPF_XOR | BPF_K:
622 case BPF_ALU | BPF_MUL | BPF_X:
623 case BPF_ALU | BPF_MUL | BPF_K:
624 case BPF_ALU | BPF_DIV | BPF_X:
625 case BPF_ALU | BPF_DIV | BPF_K:
626 case BPF_ALU | BPF_MOD | BPF_X:
627 case BPF_ALU | BPF_MOD | BPF_K:
628 case BPF_ALU | BPF_NEG:
629 case BPF_LD | BPF_ABS | BPF_W:
630 case BPF_LD | BPF_ABS | BPF_H:
631 case BPF_LD | BPF_ABS | BPF_B:
632 case BPF_LD | BPF_IND | BPF_W:
633 case BPF_LD | BPF_IND | BPF_H:
634 case BPF_LD | BPF_IND | BPF_B:
635 /* Check for overloaded BPF extension and
636 * directly convert it if found, otherwise
637 * just move on with mapping.
638 */
639 if (BPF_CLASS(fp->code) == BPF_LD &&
640 BPF_MODE(fp->code) == BPF_ABS &&
641 convert_bpf_extensions(fp, &insn))
642 break;
e0cea7ce
DB		 643 if (BPF_CLASS(fp->code) == BPF_LD &&
644 convert_bpf_ld_abs(fp, &insn)) {
645 *seen_ld_abs = true;
646 break;
647 }
bd4cf0ed 648
68fda450 649 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
f6b1b3bf 650 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
68fda450 651 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
f6b1b3bf
DB		 652 /* Error with exception code on div/mod by 0.
653 * For cBPF programs, this was always return 0.
654 */
655 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
656 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
657 *insn++ = BPF_EXIT_INSN();
658 }
68fda450 659
f8f6d679 660 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
bd4cf0ed
AS		 661 break;
662
f8f6d679
DB		 663 /* Jump transformation cannot use BPF block macros
664 * everywhere as offset calculation and target updates
665 * require a bit more work than the rest, i.e. jump
666 * opcodes map as-is, but offsets need adjustment.
667 */
668
669#define BPF_EMIT_JMP \
bd4cf0ed 670 do { \
050fad7c
DB		 671 const s32 off_min = S16_MIN, off_max = S16_MAX; \
672 s32 off; \
673 \
bd4cf0ed
AS		 674 if (target >= len || target < 0) \
675 goto err; \
050fad7c 676 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
bd4cf0ed 677 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
050fad7c
DB		 678 off -= insn - tmp_insns; \
679 /* Reject anything not fitting into insn->off. */ \
680 if (off < off_min || off > off_max) \
681 goto err; \
682 insn->off = off; \
bd4cf0ed
AS		 683 } while (0)
684
f8f6d679
DB		 685 case BPF_JMP | BPF_JA:
686 target = i + fp->k + 1;
687 insn->code = fp->code;
688 BPF_EMIT_JMP;
bd4cf0ed
AS		 689 break;
690
691 case BPF_JMP | BPF_JEQ | BPF_K:
692 case BPF_JMP | BPF_JEQ | BPF_X:
693 case BPF_JMP | BPF_JSET | BPF_K:
694 case BPF_JMP | BPF_JSET | BPF_X:
695 case BPF_JMP | BPF_JGT | BPF_K:
696 case BPF_JMP | BPF_JGT | BPF_X:
697 case BPF_JMP | BPF_JGE | BPF_K:
698 case BPF_JMP | BPF_JGE | BPF_X:
699 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
700 /* BPF immediates are signed, zero extend
701 * immediate into tmp register and use it
702 * in compare insn.
703 */
f8f6d679 704 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
bd4cf0ed 705
e430f34e
AS		 706 insn->dst_reg = BPF_REG_A;
707 insn->src_reg = BPF_REG_TMP;
bd4cf0ed
AS		 708 bpf_src = BPF_X;
709 } else {
e430f34e 710 insn->dst_reg = BPF_REG_A;
bd4cf0ed
AS		 711 insn->imm = fp->k;
712 bpf_src = BPF_SRC(fp->code);
19539ce7 713 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
1da177e4 714 }
bd4cf0ed
AS		 715
716 /* Common case where 'jump_false' is next insn. */
717 if (fp->jf == 0) {
718 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
719 target = i + fp->jt + 1;
f8f6d679 720 BPF_EMIT_JMP;
bd4cf0ed 721 break;
1da177e4 722 }
bd4cf0ed 723
92b31a9a
DB		 724 /* Convert some jumps when 'jump_true' is next insn. */
725 if (fp->jt == 0) {
726 switch (BPF_OP(fp->code)) {
727 case BPF_JEQ:
728 insn->code = BPF_JMP | BPF_JNE | bpf_src;
729 break;
730 case BPF_JGT:
731 insn->code = BPF_JMP | BPF_JLE | bpf_src;
732 break;
733 case BPF_JGE:
734 insn->code = BPF_JMP | BPF_JLT | bpf_src;
735 break;
736 default:
737 goto jmp_rest;
738 }
739
bd4cf0ed 740 target = i + fp->jf + 1;
f8f6d679 741 BPF_EMIT_JMP;
bd4cf0ed 742 break;
0b05b2a4 743 }
92b31a9a 744jmp_rest:
bd4cf0ed
AS		 745 /* Other jumps are mapped into two insns: Jxx and JA. */
746 target = i + fp->jt + 1;
747 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
f8f6d679 748 BPF_EMIT_JMP;
bd4cf0ed
AS		 749 insn++;
750
751 insn->code = BPF_JMP | BPF_JA;
752 target = i + fp->jf + 1;
f8f6d679 753 BPF_EMIT_JMP;
bd4cf0ed
AS		 754 break;
755
756 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
e0cea7ce
DB		 757 case BPF_LDX | BPF_MSH | BPF_B: {
758 struct sock_filter tmp = {
759 .code = BPF_LD | BPF_ABS | BPF_B,
760 .k = fp->k,
761 };
762
763 *seen_ld_abs = true;
764
765 /* X = A */
766 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
1268e253 767 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
e0cea7ce
DB		 768 convert_bpf_ld_abs(&tmp, &insn);
769 insn++;
9739eef1 770 /* A &= 0xf */
f8f6d679 771 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
9739eef1 772 /* A <<= 2 */
f8f6d679 773 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
e0cea7ce
DB		 774 /* tmp = X */
775 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
9739eef1 776 /* X = A */
f8f6d679 777 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
9739eef1 778 /* A = tmp */
f8f6d679 779 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
bd4cf0ed 780 break;
e0cea7ce 781 }
6205b9cf
DB		 782 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
783 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
784 */
bd4cf0ed
AS		 785 case BPF_RET | BPF_A:
786 case BPF_RET | BPF_K:
6205b9cf
DB		 787 if (BPF_RVAL(fp->code) == BPF_K)
788 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
789 0, fp->k);
9739eef1 790 *insn = BPF_EXIT_INSN();
bd4cf0ed
AS		 791 break;
792
793 /* Store to stack. */
794 case BPF_ST:
795 case BPF_STX:
50bbfed9 796 stack_off = fp->k * 4 + 4;
f8f6d679
DB		 797 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
798 BPF_ST ? BPF_REG_A : BPF_REG_X,
50bbfed9
AS		 799 -stack_off);
800 /* check_load_and_stores() verifies that classic BPF can
801 * load from stack only after write, so tracking
802 * stack_depth for ST|STX insns is enough
803 */
804 if (new_prog && new_prog->aux->stack_depth < stack_off)
805 new_prog->aux->stack_depth = stack_off;
bd4cf0ed
AS		 806 break;
807
808 /* Load from stack. */
809 case BPF_LD | BPF_MEM:
810 case BPF_LDX | BPF_MEM:
50bbfed9 811 stack_off = fp->k * 4 + 4;
f8f6d679
DB		 812 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
813 BPF_REG_A : BPF_REG_X, BPF_REG_FP,
50bbfed9 814 -stack_off);
bd4cf0ed
AS		 815 break;
816
817 /* A = K or X = K */
818 case BPF_LD | BPF_IMM:
819 case BPF_LDX | BPF_IMM:
f8f6d679
DB		 820 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
821 BPF_REG_A : BPF_REG_X, fp->k);
bd4cf0ed
AS		 822 break;
823
824 /* X = A */
825 case BPF_MISC | BPF_TAX:
f8f6d679 826 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
bd4cf0ed
AS		 827 break;
828
829 /* A = X */
830 case BPF_MISC | BPF_TXA:
f8f6d679 831 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
bd4cf0ed
AS		 832 break;
833
834 /* A = skb->len or X = skb->len */
835 case BPF_LD | BPF_W | BPF_LEN:
836 case BPF_LDX | BPF_W | BPF_LEN:
f8f6d679
DB		 837 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
838 BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
839 offsetof(struct sk_buff, len));
bd4cf0ed
AS		 840 break;
841
f8f6d679 842 /* Access seccomp_data fields. */
bd4cf0ed 843 case BPF_LDX | BPF_ABS | BPF_W:
9739eef1
AS		 844 /* A = *(u32 *) (ctx + K) */
845 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
bd4cf0ed
AS		 846 break;
847
ca9f1fd2 848 /* Unknown instruction. */
1da177e4 849 default:
bd4cf0ed 850 goto err;
1da177e4 851 }
bd4cf0ed
AS		 852
853 insn++;
854 if (new_prog)
855 memcpy(new_insn, tmp_insns,
856 sizeof(*insn) * (insn - tmp_insns));
bd4cf0ed 857 new_insn += insn - tmp_insns;
1da177e4
LT		 858 }
859
bd4cf0ed
AS		 860 if (!new_prog) {
861 /* Only calculating new length. */
50bbfed9 862 *new_len = new_insn - first_insn;
e0cea7ce
DB		 863 if (*seen_ld_abs)
864 *new_len += 4; /* Prologue bits. */
bd4cf0ed
AS		 865 return 0;
866 }
867
868 pass++;
50bbfed9
AS		 869 if (new_flen != new_insn - first_insn) {
870 new_flen = new_insn - first_insn;
bd4cf0ed
AS		 871 if (pass > 2)
872 goto err;
bd4cf0ed
AS		 873 goto do_pass;
874 }
875
876 kfree(addrs);
877 BUG_ON(*new_len != new_flen);
1da177e4 878 return 0;
bd4cf0ed
AS		 879err:
880 kfree(addrs);
881 return -EINVAL;
1da177e4
LT		 882}
883
bd4cf0ed 884/* Security:
bd4cf0ed 885 *
2d5311e4 886 * As we dont want to clear mem[] array for each packet going through
8ea6e345 887 * __bpf_prog_run(), we check that filter loaded by user never try to read
2d5311e4 888 * a cell if not previously written, and we check all branches to be sure
25985edc 889 * a malicious user doesn't try to abuse us.
2d5311e4 890 */
ec31a05c 891static int check_load_and_stores(const struct sock_filter *filter, int flen)
2d5311e4 892{
34805931 893 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
2d5311e4
ED		 894 int pc, ret = 0;
895
896 BUILD_BUG_ON(BPF_MEMWORDS > 16);
34805931 897
99e72a0f 898 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
2d5311e4
ED		 899 if (!masks)
900 return -ENOMEM;
34805931 901
2d5311e4
ED		 902 memset(masks, 0xff, flen * sizeof(*masks));
903
904 for (pc = 0; pc < flen; pc++) {
905 memvalid &= masks[pc];
906
907 switch (filter[pc].code) {
34805931
DB		 908 case BPF_ST:
909 case BPF_STX:
2d5311e4
ED		 910 memvalid |= (1 << filter[pc].k);
911 break;
34805931
DB		 912 case BPF_LD | BPF_MEM:
913 case BPF_LDX | BPF_MEM:
2d5311e4
ED		 914 if (!(memvalid & (1 << filter[pc].k))) {
915 ret = -EINVAL;
916 goto error;
917 }
918 break;
34805931
DB		 919 case BPF_JMP | BPF_JA:
920 /* A jump must set masks on target */
2d5311e4
ED		 921 masks[pc + 1 + filter[pc].k] &= memvalid;
922 memvalid = ~0;
923 break;
34805931
DB		 924 case BPF_JMP | BPF_JEQ | BPF_K:
925 case BPF_JMP | BPF_JEQ | BPF_X:
926 case BPF_JMP | BPF_JGE | BPF_K:
927 case BPF_JMP | BPF_JGE | BPF_X:
928 case BPF_JMP | BPF_JGT | BPF_K:
929 case BPF_JMP | BPF_JGT | BPF_X:
930 case BPF_JMP | BPF_JSET | BPF_K:
931 case BPF_JMP | BPF_JSET | BPF_X:
932 /* A jump must set masks on targets */
2d5311e4
ED		 933 masks[pc + 1 + filter[pc].jt] &= memvalid;
934 masks[pc + 1 + filter[pc].jf] &= memvalid;
935 memvalid = ~0;
936 break;
937 }
938 }
939error:
940 kfree(masks);
941 return ret;
942}
943
34805931
DB		 944static bool chk_code_allowed(u16 code_to_probe)
945{
946 static const bool codes[] = {
947 /* 32 bit ALU operations */
948 [BPF_ALU | BPF_ADD | BPF_K] = true,
949 [BPF_ALU | BPF_ADD | BPF_X] = true,
950 [BPF_ALU | BPF_SUB | BPF_K] = true,
951 [BPF_ALU | BPF_SUB | BPF_X] = true,
952 [BPF_ALU | BPF_MUL | BPF_K] = true,
953 [BPF_ALU | BPF_MUL | BPF_X] = true,
954 [BPF_ALU | BPF_DIV | BPF_K] = true,
955 [BPF_ALU | BPF_DIV | BPF_X] = true,
956 [BPF_ALU | BPF_MOD | BPF_K] = true,
957 [BPF_ALU | BPF_MOD | BPF_X] = true,
958 [BPF_ALU | BPF_AND | BPF_K] = true,
959 [BPF_ALU | BPF_AND | BPF_X] = true,
960 [BPF_ALU | BPF_OR | BPF_K] = true,
961 [BPF_ALU | BPF_OR | BPF_X] = true,
962 [BPF_ALU | BPF_XOR | BPF_K] = true,
963 [BPF_ALU | BPF_XOR | BPF_X] = true,
964 [BPF_ALU | BPF_LSH | BPF_K] = true,
965 [BPF_ALU | BPF_LSH | BPF_X] = true,
966 [BPF_ALU | BPF_RSH | BPF_K] = true,
967 [BPF_ALU | BPF_RSH | BPF_X] = true,
968 [BPF_ALU | BPF_NEG] = true,
969 /* Load instructions */
970 [BPF_LD | BPF_W | BPF_ABS] = true,
971 [BPF_LD | BPF_H | BPF_ABS] = true,
972 [BPF_LD | BPF_B | BPF_ABS] = true,
973 [BPF_LD | BPF_W | BPF_LEN] = true,
974 [BPF_LD | BPF_W | BPF_IND] = true,
975 [BPF_LD | BPF_H | BPF_IND] = true,
976 [BPF_LD | BPF_B | BPF_IND] = true,
977 [BPF_LD | BPF_IMM] = true,
978 [BPF_LD | BPF_MEM] = true,
979 [BPF_LDX | BPF_W | BPF_LEN] = true,
980 [BPF_LDX | BPF_B | BPF_MSH] = true,
981 [BPF_LDX | BPF_IMM] = true,
982 [BPF_LDX | BPF_MEM] = true,
983 /* Store instructions */
984 [BPF_ST] = true,
985 [BPF_STX] = true,
986 /* Misc instructions */
987 [BPF_MISC | BPF_TAX] = true,
988 [BPF_MISC | BPF_TXA] = true,
989 /* Return instructions */
990 [BPF_RET | BPF_K] = true,
991 [BPF_RET | BPF_A] = true,
992 /* Jump instructions */
993 [BPF_JMP | BPF_JA] = true,
994 [BPF_JMP | BPF_JEQ | BPF_K] = true,
995 [BPF_JMP | BPF_JEQ | BPF_X] = true,
996 [BPF_JMP | BPF_JGE | BPF_K] = true,
997 [BPF_JMP | BPF_JGE | BPF_X] = true,
998 [BPF_JMP | BPF_JGT | BPF_K] = true,
999 [BPF_JMP | BPF_JGT | BPF_X] = true,
1000 [BPF_JMP | BPF_JSET | BPF_K] = true,
1001 [BPF_JMP | BPF_JSET | BPF_X] = true,
1002 };
1003
1004 if (code_to_probe >= ARRAY_SIZE(codes))
1005 return false;
1006
1007 return codes[code_to_probe];
1008}
1009
f7bd9e36
DB		 1010static bool bpf_check_basics_ok(const struct sock_filter *filter,
1011 unsigned int flen)
1012{
1013 if (filter == NULL)
1014 return false;
1015 if (flen == 0 || flen > BPF_MAXINSNS)
1016 return false;
1017
1018 return true;
1019}
1020
1da177e4 1021/**
4df95ff4 1022 * bpf_check_classic - verify socket filter code
1da177e4
LT		 1023 * @filter: filter to verify
1024 * @flen: length of filter
1025 *
1026 * Check the user's filter code. If we let some ugly
1027 * filter code slip through kaboom! The filter must contain
93699863
KK		 1028 * no references or jumps that are out of range, no illegal
1029 * instructions, and must end with a RET instruction.
1da177e4 1030 *
7b11f69f
KK		 1031 * All jumps are forward as they are not signed.
1032 *
1033 * Returns 0 if the rule set is legal or -EINVAL if not.
1da177e4 1034 */
d9e12f42
NS		 1035static int bpf_check_classic(const struct sock_filter *filter,
1036 unsigned int flen)
1da177e4 1037{
aa1113d9 1038 bool anc_found;
34805931 1039 int pc;
1da177e4 1040
34805931 1041 /* Check the filter code now */
1da177e4 1042 for (pc = 0; pc < flen; pc++) {
ec31a05c 1043 const struct sock_filter *ftest = &filter[pc];
93699863 1044
34805931
DB		 1045 /* May we actually operate on this code? */
1046 if (!chk_code_allowed(ftest->code))
cba328fc 1047 return -EINVAL;
34805931 1048
93699863 1049 /* Some instructions need special checks */
34805931
DB		 1050 switch (ftest->code) {
1051 case BPF_ALU | BPF_DIV | BPF_K:
1052 case BPF_ALU | BPF_MOD | BPF_K:
1053 /* Check for division by zero */
b6069a95
ED		 1054 if (ftest->k == 0)
1055 return -EINVAL;
1056 break;
229394e8
RV		 1057 case BPF_ALU | BPF_LSH | BPF_K:
1058 case BPF_ALU | BPF_RSH | BPF_K:
1059 if (ftest->k >= 32)
1060 return -EINVAL;
1061 break;
34805931
DB		 1062 case BPF_LD | BPF_MEM:
1063 case BPF_LDX | BPF_MEM:
1064 case BPF_ST:
1065 case BPF_STX:
1066 /* Check for invalid memory addresses */
93699863
KK		 1067 if (ftest->k >= BPF_MEMWORDS)
1068 return -EINVAL;
1069 break;
34805931
DB		 1070 case BPF_JMP | BPF_JA:
1071 /* Note, the large ftest->k might cause loops.
93699863
KK		 1072 * Compare this with conditional jumps below,
1073 * where offsets are limited. --ANK (981016)
1074 */
34805931 1075 if (ftest->k >= (unsigned int)(flen - pc - 1))
93699863 1076 return -EINVAL;
01f2f3f6 1077 break;
34805931
DB		 1078 case BPF_JMP | BPF_JEQ | BPF_K:
1079 case BPF_JMP | BPF_JEQ | BPF_X:
1080 case BPF_JMP | BPF_JGE | BPF_K:
1081 case BPF_JMP | BPF_JGE | BPF_X:
1082 case BPF_JMP | BPF_JGT | BPF_K:
1083 case BPF_JMP | BPF_JGT | BPF_X:
1084 case BPF_JMP | BPF_JSET | BPF_K:
1085 case BPF_JMP | BPF_JSET | BPF_X:
1086 /* Both conditionals must be safe */
e35bedf3 1087 if (pc + ftest->jt + 1 >= flen ||
93699863
KK		 1088 pc + ftest->jf + 1 >= flen)
1089 return -EINVAL;
cba328fc 1090 break;
34805931
DB		 1091 case BPF_LD | BPF_W | BPF_ABS:
1092 case BPF_LD | BPF_H | BPF_ABS:
1093 case BPF_LD | BPF_B | BPF_ABS:
aa1113d9 1094 anc_found = false;
34805931
DB		 1095 if (bpf_anc_helper(ftest) & BPF_ANC)
1096 anc_found = true;
1097 /* Ancillary operation unknown or unsupported */
aa1113d9
DB		 1098 if (anc_found == false && ftest->k >= SKF_AD_OFF)
1099 return -EINVAL;
01f2f3f6
HPP		 1100 }
1101 }
93699863 1102
34805931 1103 /* Last instruction must be a RET code */
01f2f3f6 1104 switch (filter[flen - 1].code) {
34805931
DB		 1105 case BPF_RET | BPF_K:
1106 case BPF_RET | BPF_A:
2d5311e4 1107 return check_load_and_stores(filter, flen);
cba328fc 1108 }
34805931 1109
cba328fc 1110 return -EINVAL;
1da177e4
LT		 1111}
1112
7ae457c1
AS		 1113static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
1114 const struct sock_fprog *fprog)
a3ea269b 1115{
009937e7 1116 unsigned int fsize = bpf_classic_proglen(fprog);
a3ea269b
DB		 1117 struct sock_fprog_kern *fkprog;
1118
1119 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
1120 if (!fp->orig_prog)
1121 return -ENOMEM;
1122
1123 fkprog = fp->orig_prog;
1124 fkprog->len = fprog->len;
658da937
DB		 1125
1126 fkprog->filter = kmemdup(fp->insns, fsize,
1127 GFP_KERNEL | __GFP_NOWARN);
a3ea269b
DB		 1128 if (!fkprog->filter) {
1129 kfree(fp->orig_prog);
1130 return -ENOMEM;
1131 }
1132
1133 return 0;
1134}
1135
7ae457c1 1136static void bpf_release_orig_filter(struct bpf_prog *fp)
a3ea269b
DB		 1137{
1138 struct sock_fprog_kern *fprog = fp->orig_prog;
1139
1140 if (fprog) {
1141 kfree(fprog->filter);
1142 kfree(fprog);
1143 }
1144}
1145
7ae457c1
AS		 1146static void __bpf_prog_release(struct bpf_prog *prog)
1147{
24701ece 1148 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
89aa0758
AS		 1149 bpf_prog_put(prog);
1150 } else {
1151 bpf_release_orig_filter(prog);
1152 bpf_prog_free(prog);
1153 }
7ae457c1
AS		 1154}
1155
34c5bd66
PN		 1156static void __sk_filter_release(struct sk_filter *fp)
1157{
7ae457c1
AS		 1158 __bpf_prog_release(fp->prog);
1159 kfree(fp);
34c5bd66
PN		 1160}
1161
47e958ea 1162/**
46bcf14f 1163 * sk_filter_release_rcu - Release a socket filter by rcu_head
47e958ea
PE		 1164 * @rcu: rcu_head that contains the sk_filter to free
1165 */
fbc907f0 1166static void sk_filter_release_rcu(struct rcu_head *rcu)
47e958ea
PE		 1167{
1168 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
1169
34c5bd66 1170 __sk_filter_release(fp);
47e958ea 1171}
fbc907f0
DB		 1172
1173/**
1174 * sk_filter_release - release a socket filter
1175 * @fp: filter to remove
1176 *
1177 * Remove a filter from a socket and release its resources.
1178 */
1179static void sk_filter_release(struct sk_filter *fp)
1180{
4c355cdf 1181 if (refcount_dec_and_test(&fp->refcnt))
fbc907f0
DB		 1182 call_rcu(&fp->rcu, sk_filter_release_rcu);
1183}
1184
1185void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
1186{
7ae457c1 1187 u32 filter_size = bpf_prog_size(fp->prog->len);
fbc907f0 1188
278571ba
AS		 1189 atomic_sub(filter_size, &sk->sk_omem_alloc);
1190 sk_filter_release(fp);
fbc907f0 1191}
47e958ea 1192
278571ba
AS		 1193/* try to charge the socket memory if there is space available
1194 * return true on success
1195 */
4c355cdf 1196static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
bd4cf0ed 1197{
7ae457c1 1198 u32 filter_size = bpf_prog_size(fp->prog->len);
278571ba
AS		 1199
1200 /* same check as in sock_kmalloc() */
1201 if (filter_size <= sysctl_optmem_max &&
1202 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
278571ba
AS		 1203 atomic_add(filter_size, &sk->sk_omem_alloc);
1204 return true;
bd4cf0ed 1205 }
278571ba 1206 return false;
bd4cf0ed
AS		 1207}
1208
4c355cdf
RE		 1209bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1210{
eefca20e
ED		 1211 if (!refcount_inc_not_zero(&fp->refcnt))
1212 return false;
1213
1214 if (!__sk_filter_charge(sk, fp)) {
1215 sk_filter_release(fp);
1216 return false;
1217 }
1218 return true;
4c355cdf
RE		 1219}
1220
7ae457c1 1221static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
bd4cf0ed
AS		 1222{
1223 struct sock_filter *old_prog;
7ae457c1 1224 struct bpf_prog *old_fp;
34805931 1225 int err, new_len, old_len = fp->len;
e0cea7ce 1226 bool seen_ld_abs = false;
bd4cf0ed
AS		 1227
1228 /* We are free to overwrite insns et al right here as it
1229 * won't be used at this point in time anymore internally
1230 * after the migration to the internal BPF instruction
1231 * representation.
1232 */
1233 BUILD_BUG_ON(sizeof(struct sock_filter) !=
2695fb55 1234 sizeof(struct bpf_insn));
bd4cf0ed 1235
bd4cf0ed
AS		 1236 /* Conversion cannot happen on overlapping memory areas,
1237 * so we need to keep the user BPF around until the 2nd
1238 * pass. At this time, the user BPF is stored in fp->insns.
1239 */
1240 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
658da937 1241 GFP_KERNEL | __GFP_NOWARN);
bd4cf0ed
AS		 1242 if (!old_prog) {
1243 err = -ENOMEM;
1244 goto out_err;
1245 }
1246
1247 /* 1st pass: calculate the new program length. */
e0cea7ce
DB		 1248 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
1249 &seen_ld_abs);
bd4cf0ed
AS		 1250 if (err)
1251 goto out_err_free;
1252
1253 /* Expand fp for appending the new filter representation. */
1254 old_fp = fp;
60a3b225 1255 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
bd4cf0ed
AS		 1256 if (!fp) {
1257 /* The old_fp is still around in case we couldn't
1258 * allocate new memory, so uncharge on that one.
1259 */
1260 fp = old_fp;
1261 err = -ENOMEM;
1262 goto out_err_free;
1263 }
1264
bd4cf0ed
AS		 1265 fp->len = new_len;
1266
2695fb55 1267 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
e0cea7ce
DB		 1268 err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
1269 &seen_ld_abs);
bd4cf0ed 1270 if (err)
8fb575ca 1271 /* 2nd bpf_convert_filter() can fail only if it fails
bd4cf0ed
AS		 1272 * to allocate memory, remapping must succeed. Note,
1273 * that at this time old_fp has already been released
278571ba 1274 * by krealloc().
bd4cf0ed
AS		 1275 */
1276 goto out_err_free;
1277
d1c55ab5 1278 fp = bpf_prog_select_runtime(fp, &err);
290af866
AS		 1279 if (err)
1280 goto out_err_free;
5fe821a9 1281
bd4cf0ed
AS		 1282 kfree(old_prog);
1283 return fp;
1284
1285out_err_free:
1286 kfree(old_prog);
1287out_err:
7ae457c1 1288 __bpf_prog_release(fp);
bd4cf0ed
AS		 1289 return ERR_PTR(err);
1290}
1291
ac67eb2c
DB		 1292static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1293 bpf_aux_classic_check_t trans)
302d6637
JP		 1294{
1295 int err;
1296
bd4cf0ed 1297 fp->bpf_func = NULL;
a91263d5 1298 fp->jited = 0;
302d6637 1299
4df95ff4 1300 err = bpf_check_classic(fp->insns, fp->len);
418c96ac 1301 if (err) {
7ae457c1 1302 __bpf_prog_release(fp);
bd4cf0ed 1303 return ERR_PTR(err);
418c96ac 1304 }
302d6637 1305
4ae92bc7
NS		 1306 /* There might be additional checks and transformations
1307 * needed on classic filters, f.e. in case of seccomp.
1308 */
1309 if (trans) {
1310 err = trans(fp->insns, fp->len);
1311 if (err) {
1312 __bpf_prog_release(fp);
1313 return ERR_PTR(err);
1314 }
1315 }
1316
bd4cf0ed
AS		 1317 /* Probe if we can JIT compile the filter and if so, do
1318 * the compilation of the filter.
1319 */
302d6637 1320 bpf_jit_compile(fp);
bd4cf0ed
AS		 1321
1322 /* JIT compiler couldn't process this filter, so do the
1323 * internal BPF translation for the optimized interpreter.
1324 */
5fe821a9 1325 if (!fp->jited)
7ae457c1 1326 fp = bpf_migrate_filter(fp);
bd4cf0ed
AS		 1327
1328 return fp;
302d6637
JP		 1329}
1330
1331/**
7ae457c1 1332 * bpf_prog_create - create an unattached filter
c6c4b97c 1333 * @pfp: the unattached filter that is created
677a9fd3 1334 * @fprog: the filter program
302d6637 1335 *
c6c4b97c 1336 * Create a filter independent of any socket. We first run some
302d6637
JP		 1337 * sanity checks on it to make sure it does not explode on us later.
1338 * If an error occurs or there is insufficient memory for the filter
1339 * a negative errno code is returned. On success the return is zero.
1340 */
7ae457c1 1341int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
302d6637 1342{
009937e7 1343 unsigned int fsize = bpf_classic_proglen(fprog);
7ae457c1 1344 struct bpf_prog *fp;
302d6637
JP		 1345
1346 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1347 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
302d6637
JP		 1348 return -EINVAL;
1349
60a3b225 1350 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
302d6637
JP		 1351 if (!fp)
1352 return -ENOMEM;
a3ea269b 1353
302d6637
JP		 1354 memcpy(fp->insns, fprog->filter, fsize);
1355
302d6637 1356 fp->len = fprog->len;
a3ea269b
DB		 1357 /* Since unattached filters are not copied back to user
1358 * space through sk_get_filter(), we do not need to hold
1359 * a copy here, and can spare us the work.
1360 */
1361 fp->orig_prog = NULL;
302d6637 1362
7ae457c1 1363 /* bpf_prepare_filter() already takes care of freeing
bd4cf0ed
AS		 1364 * memory in case something goes wrong.
1365 */
4ae92bc7 1366 fp = bpf_prepare_filter(fp, NULL);
bd4cf0ed
AS		 1367 if (IS_ERR(fp))
1368 return PTR_ERR(fp);
302d6637
JP		 1369
1370 *pfp = fp;
1371 return 0;
302d6637 1372}
7ae457c1 1373EXPORT_SYMBOL_GPL(bpf_prog_create);
302d6637 1374
ac67eb2c
DB		 1375/**
1376 * bpf_prog_create_from_user - create an unattached filter from user buffer
1377 * @pfp: the unattached filter that is created
1378 * @fprog: the filter program
1379 * @trans: post-classic verifier transformation handler
bab18991 1380 * @save_orig: save classic BPF program
ac67eb2c
DB		 1381 *
1382 * This function effectively does the same as bpf_prog_create(), only
1383 * that it builds up its insns buffer from user space provided buffer.
1384 * It also allows for passing a bpf_aux_classic_check_t handler.
1385 */
1386int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
bab18991 1387 bpf_aux_classic_check_t trans, bool save_orig)
ac67eb2c
DB		 1388{
1389 unsigned int fsize = bpf_classic_proglen(fprog);
1390 struct bpf_prog *fp;
bab18991 1391 int err;
ac67eb2c
DB		 1392
1393 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1394 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
ac67eb2c
DB		 1395 return -EINVAL;
1396
1397 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1398 if (!fp)
1399 return -ENOMEM;
1400
1401 if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1402 __bpf_prog_free(fp);
1403 return -EFAULT;
1404 }
1405
1406 fp->len = fprog->len;
ac67eb2c
DB		 1407 fp->orig_prog = NULL;
1408
bab18991
DB		 1409 if (save_orig) {
1410 err = bpf_prog_store_orig_filter(fp, fprog);
1411 if (err) {
1412 __bpf_prog_free(fp);
1413 return -ENOMEM;
1414 }
1415 }
1416
ac67eb2c
DB		 1417 /* bpf_prepare_filter() already takes care of freeing
1418 * memory in case something goes wrong.
1419 */
1420 fp = bpf_prepare_filter(fp, trans);
1421 if (IS_ERR(fp))
1422 return PTR_ERR(fp);
1423
1424 *pfp = fp;
1425 return 0;
1426}
2ea273d7 1427EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
ac67eb2c 1428
7ae457c1 1429void bpf_prog_destroy(struct bpf_prog *fp)
302d6637 1430{
7ae457c1 1431 __bpf_prog_release(fp);
302d6637 1432}
7ae457c1 1433EXPORT_SYMBOL_GPL(bpf_prog_destroy);
302d6637 1434
8ced425e 1435static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
49b31e57
DB		 1436{
1437 struct sk_filter *fp, *old_fp;
1438
1439 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1440 if (!fp)
1441 return -ENOMEM;
1442
1443 fp->prog = prog;
49b31e57 1444
4c355cdf 1445 if (!__sk_filter_charge(sk, fp)) {
49b31e57
DB		 1446 kfree(fp);
1447 return -ENOMEM;
1448 }
4c355cdf 1449 refcount_set(&fp->refcnt, 1);
49b31e57 1450
8ced425e
HFS		 1451 old_fp = rcu_dereference_protected(sk->sk_filter,
1452 lockdep_sock_is_held(sk));
49b31e57 1453 rcu_assign_pointer(sk->sk_filter, fp);
8ced425e 1454
49b31e57
DB		 1455 if (old_fp)
1456 sk_filter_uncharge(sk, old_fp);
1457
1458 return 0;
1459}
1460
538950a1
CG		 1461static
1462struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1da177e4 1463{
009937e7 1464 unsigned int fsize = bpf_classic_proglen(fprog);
7ae457c1 1465 struct bpf_prog *prog;
1da177e4
LT		 1466 int err;
1467
d59577b6 1468 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1469 return ERR_PTR(-EPERM);
d59577b6 1470
1da177e4 1471 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1472 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
538950a1 1473 return ERR_PTR(-EINVAL);
1da177e4 1474
f7bd9e36 1475 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
7ae457c1 1476 if (!prog)
538950a1 1477 return ERR_PTR(-ENOMEM);
a3ea269b 1478
7ae457c1 1479 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
c0d1379a 1480 __bpf_prog_free(prog);
538950a1 1481 return ERR_PTR(-EFAULT);
1da177e4
LT		 1482 }
1483
7ae457c1 1484 prog->len = fprog->len;
1da177e4 1485
7ae457c1 1486 err = bpf_prog_store_orig_filter(prog, fprog);
a3ea269b 1487 if (err) {
c0d1379a 1488 __bpf_prog_free(prog);
538950a1 1489 return ERR_PTR(-ENOMEM);
a3ea269b
DB		 1490 }
1491
7ae457c1 1492 /* bpf_prepare_filter() already takes care of freeing
bd4cf0ed
AS		 1493 * memory in case something goes wrong.
1494 */
538950a1
CG		 1495 return bpf_prepare_filter(prog, NULL);
1496}
1497
1498/**
1499 * sk_attach_filter - attach a socket filter
1500 * @fprog: the filter program
1501 * @sk: the socket to use
1502 *
1503 * Attach the user's filter code. We first run some sanity checks on
1504 * it to make sure it does not explode on us later. If an error
1505 * occurs or there is insufficient memory for the filter a negative
1506 * errno code is returned. On success the return is zero.
1507 */
8ced425e 1508int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
538950a1
CG		 1509{
1510 struct bpf_prog *prog = __get_filter(fprog, sk);
1511 int err;
1512
7ae457c1
AS		 1513 if (IS_ERR(prog))
1514 return PTR_ERR(prog);
1515
8ced425e 1516 err = __sk_attach_prog(prog, sk);
49b31e57 1517 if (err < 0) {
7ae457c1 1518 __bpf_prog_release(prog);
49b31e57 1519 return err;
278571ba
AS		 1520 }
1521
d3904b73 1522 return 0;
1da177e4 1523}
8ced425e 1524EXPORT_SYMBOL_GPL(sk_attach_filter);
1da177e4 1525
538950a1 1526int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
89aa0758 1527{
538950a1 1528 struct bpf_prog *prog = __get_filter(fprog, sk);
49b31e57 1529 int err;
89aa0758 1530
538950a1
CG		 1531 if (IS_ERR(prog))
1532 return PTR_ERR(prog);
1533
8217ca65
MKL		 1534 if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1535 err = -ENOMEM;
1536 else
1537 err = reuseport_attach_prog(sk, prog);
1538
1539 if (err)
538950a1 1540 __bpf_prog_release(prog);
538950a1 1541
8217ca65 1542 return err;
538950a1
CG		 1543}
1544
1545static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1546{
89aa0758 1547 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1548 return ERR_PTR(-EPERM);
89aa0758 1549
113214be 1550 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
538950a1
CG		 1551}
1552
1553int sk_attach_bpf(u32 ufd, struct sock *sk)
1554{
1555 struct bpf_prog *prog = __get_bpf(ufd, sk);
1556 int err;
1557
1558 if (IS_ERR(prog))
1559 return PTR_ERR(prog);
1560
8ced425e 1561 err = __sk_attach_prog(prog, sk);
49b31e57 1562 if (err < 0) {
89aa0758 1563 bpf_prog_put(prog);
49b31e57 1564 return err;
89aa0758
AS		 1565 }
1566
89aa0758
AS		 1567 return 0;
1568}
1569
538950a1
CG		 1570int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1571{
8217ca65 1572 struct bpf_prog *prog;
538950a1
CG		 1573 int err;
1574
8217ca65
MKL		 1575 if (sock_flag(sk, SOCK_FILTER_LOCKED))
1576 return -EPERM;
1577
1578 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1579 if (IS_ERR(prog) && PTR_ERR(prog) == -EINVAL)
1580 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
538950a1
CG		 1581 if (IS_ERR(prog))
1582 return PTR_ERR(prog);
1583
8217ca65
MKL		 1584 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1585 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1586 * bpf prog (e.g. sockmap). It depends on the
1587 * limitation imposed by bpf_prog_load().
1588 * Hence, sysctl_optmem_max is not checked.
1589 */
1590 if ((sk->sk_type != SOCK_STREAM &&
1591 sk->sk_type != SOCK_DGRAM) ||
1592 (sk->sk_protocol != IPPROTO_UDP &&
1593 sk->sk_protocol != IPPROTO_TCP) ||
1594 (sk->sk_family != AF_INET &&
1595 sk->sk_family != AF_INET6)) {
1596 err = -ENOTSUPP;
1597 goto err_prog_put;
1598 }
1599 } else {
1600 /* BPF_PROG_TYPE_SOCKET_FILTER */
1601 if (bpf_prog_size(prog->len) > sysctl_optmem_max) {
1602 err = -ENOMEM;
1603 goto err_prog_put;
1604 }
538950a1
CG		 1605 }
1606
8217ca65
MKL		 1607 err = reuseport_attach_prog(sk, prog);
1608err_prog_put:
1609 if (err)
1610 bpf_prog_put(prog);
1611
1612 return err;
1613}
1614
1615void sk_reuseport_prog_free(struct bpf_prog *prog)
1616{
1617 if (!prog)
1618 return;
1619
1620 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1621 bpf_prog_put(prog);
1622 else
1623 bpf_prog_destroy(prog);
538950a1
CG		 1624}
1625
21cafc1d
DB		 1626struct bpf_scratchpad {
1627 union {
1628 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1629 u8 buff[MAX_BPF_STACK];
1630 };
1631};
1632
1633static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
91bc4822 1634
5293efe6
DB		 1635static inline int __bpf_try_make_writable(struct sk_buff *skb,
1636 unsigned int write_len)
1637{
1638 return skb_ensure_writable(skb, write_len);
1639}
1640
db58ba45
AS		 1641static inline int bpf_try_make_writable(struct sk_buff *skb,
1642 unsigned int write_len)
1643{
5293efe6 1644 int err = __bpf_try_make_writable(skb, write_len);
db58ba45 1645
6aaae2b6 1646 bpf_compute_data_pointers(skb);
db58ba45
AS		 1647 return err;
1648}
1649
36bbef52
DB		 1650static int bpf_try_make_head_writable(struct sk_buff *skb)
1651{
1652 return bpf_try_make_writable(skb, skb_headlen(skb));
1653}
1654
a2bfe6bf
DB		 1655static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1656{
1657 if (skb_at_tc_ingress(skb))
1658 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1659}
1660
8065694e
DB		 1661static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1662{
1663 if (skb_at_tc_ingress(skb))
1664 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1665}
1666
f3694e00
DB		 1667BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1668 const void *, from, u32, len, u64, flags)
608cd71a 1669{
608cd71a
AS		 1670 void *ptr;
1671
8afd54c8 1672 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
781c53bc 1673 return -EINVAL;
0ed661d5 1674 if (unlikely(offset > 0xffff))
608cd71a 1675 return -EFAULT;
db58ba45 1676 if (unlikely(bpf_try_make_writable(skb, offset + len)))
608cd71a
AS		 1677 return -EFAULT;
1678
0ed661d5 1679 ptr = skb->data + offset;
781c53bc 1680 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1681 __skb_postpull_rcsum(skb, ptr, len, offset);
608cd71a
AS		 1682
1683 memcpy(ptr, from, len);
1684
781c53bc 1685 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1686 __skb_postpush_rcsum(skb, ptr, len, offset);
8afd54c8
DB		 1687 if (flags & BPF_F_INVALIDATE_HASH)
1688 skb_clear_hash(skb);
f8ffad69 1689
608cd71a
AS		 1690 return 0;
1691}
1692
577c50aa 1693static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
608cd71a
AS		 1694 .func = bpf_skb_store_bytes,
1695 .gpl_only = false,
1696 .ret_type = RET_INTEGER,
1697 .arg1_type = ARG_PTR_TO_CTX,
1698 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1699 .arg3_type = ARG_PTR_TO_MEM,
1700 .arg4_type = ARG_CONST_SIZE,
91bc4822
AS		 1701 .arg5_type = ARG_ANYTHING,
1702};
1703
f3694e00
DB		 1704BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1705 void *, to, u32, len)
05c74e5e 1706{
05c74e5e
DB		 1707 void *ptr;
1708
0ed661d5 1709 if (unlikely(offset > 0xffff))
074f528e 1710 goto err_clear;
05c74e5e
DB		 1711
1712 ptr = skb_header_pointer(skb, offset, len, to);
1713 if (unlikely(!ptr))
074f528e 1714 goto err_clear;
05c74e5e
DB		 1715 if (ptr != to)
1716 memcpy(to, ptr, len);
1717
1718 return 0;
074f528e
DB		 1719err_clear:
1720 memset(to, 0, len);
1721 return -EFAULT;
05c74e5e
DB		 1722}
1723
577c50aa 1724static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
05c74e5e
DB		 1725 .func = bpf_skb_load_bytes,
1726 .gpl_only = false,
1727 .ret_type = RET_INTEGER,
1728 .arg1_type = ARG_PTR_TO_CTX,
1729 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1730 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1731 .arg4_type = ARG_CONST_SIZE,
05c74e5e
DB		 1732};
1733
4e1ec56c
DB		 1734BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1735 u32, offset, void *, to, u32, len, u32, start_header)
1736{
3eee1f75
DB		 1737 u8 *end = skb_tail_pointer(skb);
1738 u8 *net = skb_network_header(skb);
1739 u8 *mac = skb_mac_header(skb);
4e1ec56c
DB		 1740 u8 *ptr;
1741
3eee1f75 1742 if (unlikely(offset > 0xffff || len > (end - mac)))
4e1ec56c
DB		 1743 goto err_clear;
1744
1745 switch (start_header) {
1746 case BPF_HDR_START_MAC:
3eee1f75 1747 ptr = mac + offset;
4e1ec56c
DB		 1748 break;
1749 case BPF_HDR_START_NET:
3eee1f75 1750 ptr = net + offset;
4e1ec56c
DB		 1751 break;
1752 default:
1753 goto err_clear;
1754 }
1755
3eee1f75 1756 if (likely(ptr >= mac && ptr + len <= end)) {
4e1ec56c
DB		 1757 memcpy(to, ptr, len);
1758 return 0;
1759 }
1760
1761err_clear:
1762 memset(to, 0, len);
1763 return -EFAULT;
1764}
1765
1766static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1767 .func = bpf_skb_load_bytes_relative,
1768 .gpl_only = false,
1769 .ret_type = RET_INTEGER,
1770 .arg1_type = ARG_PTR_TO_CTX,
1771 .arg2_type = ARG_ANYTHING,
1772 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1773 .arg4_type = ARG_CONST_SIZE,
1774 .arg5_type = ARG_ANYTHING,
1775};
1776
36bbef52
DB		 1777BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1778{
1779 /* Idea is the following: should the needed direct read/write
1780 * test fail during runtime, we can pull in more data and redo
1781 * again, since implicitly, we invalidate previous checks here.
1782 *
1783 * Or, since we know how much we need to make read/writeable,
1784 * this can be done once at the program beginning for direct
1785 * access case. By this we overcome limitations of only current
1786 * headroom being accessible.
1787 */
1788 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1789}
1790
1791static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1792 .func = bpf_skb_pull_data,
1793 .gpl_only = false,
1794 .ret_type = RET_INTEGER,
1795 .arg1_type = ARG_PTR_TO_CTX,
1796 .arg2_type = ARG_ANYTHING,
1797};
1798
0ea488ff
JF		 1799static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1800 unsigned int write_len)
1801{
1802 int err = __bpf_try_make_writable(skb, write_len);
1803
1804 bpf_compute_data_end_sk_skb(skb);
1805 return err;
1806}
1807
1808BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
1809{
1810 /* Idea is the following: should the needed direct read/write
1811 * test fail during runtime, we can pull in more data and redo
1812 * again, since implicitly, we invalidate previous checks here.
1813 *
1814 * Or, since we know how much we need to make read/writeable,
1815 * this can be done once at the program beginning for direct
1816 * access case. By this we overcome limitations of only current
1817 * headroom being accessible.
1818 */
1819 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1820}
1821
1822static const struct bpf_func_proto sk_skb_pull_data_proto = {
1823 .func = sk_skb_pull_data,
1824 .gpl_only = false,
1825 .ret_type = RET_INTEGER,
1826 .arg1_type = ARG_PTR_TO_CTX,
1827 .arg2_type = ARG_ANYTHING,
1828};
1829
f3694e00
DB		 1830BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1831 u64, from, u64, to, u64, flags)
91bc4822 1832{
0ed661d5 1833 __sum16 *ptr;
91bc4822 1834
781c53bc
DB		 1835 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1836 return -EINVAL;
0ed661d5 1837 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1838 return -EFAULT;
0ed661d5 1839 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1840 return -EFAULT;
1841
0ed661d5 1842 ptr = (__sum16 *)(skb->data + offset);
781c53bc 1843 switch (flags & BPF_F_HDR_FIELD_MASK) {
8050c0f0
DB		 1844 case 0:
1845 if (unlikely(from != 0))
1846 return -EINVAL;
1847
1848 csum_replace_by_diff(ptr, to);
1849 break;
91bc4822
AS		 1850 case 2:
1851 csum_replace2(ptr, from, to);
1852 break;
1853 case 4:
1854 csum_replace4(ptr, from, to);
1855 break;
1856 default:
1857 return -EINVAL;
1858 }
1859
91bc4822
AS		 1860 return 0;
1861}
1862
577c50aa 1863static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
91bc4822
AS		 1864 .func = bpf_l3_csum_replace,
1865 .gpl_only = false,
1866 .ret_type = RET_INTEGER,
1867 .arg1_type = ARG_PTR_TO_CTX,
1868 .arg2_type = ARG_ANYTHING,
1869 .arg3_type = ARG_ANYTHING,
1870 .arg4_type = ARG_ANYTHING,
1871 .arg5_type = ARG_ANYTHING,
1872};
1873
f3694e00
DB		 1874BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1875 u64, from, u64, to, u64, flags)
91bc4822 1876{
781c53bc 1877 bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
2f72959a 1878 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
d1b662ad 1879 bool do_mforce = flags & BPF_F_MARK_ENFORCE;
0ed661d5 1880 __sum16 *ptr;
91bc4822 1881
d1b662ad
DB		 1882 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1883 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
781c53bc 1884 return -EINVAL;
0ed661d5 1885 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1886 return -EFAULT;
0ed661d5 1887 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1888 return -EFAULT;
1889
0ed661d5 1890 ptr = (__sum16 *)(skb->data + offset);
d1b662ad 1891 if (is_mmzero && !do_mforce && !*ptr)
2f72959a 1892 return 0;
91bc4822 1893
781c53bc 1894 switch (flags & BPF_F_HDR_FIELD_MASK) {
7d672345
DB		 1895 case 0:
1896 if (unlikely(from != 0))
1897 return -EINVAL;
1898
1899 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1900 break;
91bc4822
AS		 1901 case 2:
1902 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1903 break;
1904 case 4:
1905 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1906 break;
1907 default:
1908 return -EINVAL;
1909 }
1910
2f72959a
DB		 1911 if (is_mmzero && !*ptr)
1912 *ptr = CSUM_MANGLED_0;
91bc4822
AS		 1913 return 0;
1914}
1915
577c50aa 1916static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
91bc4822
AS		 1917 .func = bpf_l4_csum_replace,
1918 .gpl_only = false,
1919 .ret_type = RET_INTEGER,
1920 .arg1_type = ARG_PTR_TO_CTX,
1921 .arg2_type = ARG_ANYTHING,
1922 .arg3_type = ARG_ANYTHING,
1923 .arg4_type = ARG_ANYTHING,
1924 .arg5_type = ARG_ANYTHING,
608cd71a
AS		 1925};
1926
f3694e00
DB		 1927BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1928 __be32 *, to, u32, to_size, __wsum, seed)
7d672345 1929{
21cafc1d 1930 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
f3694e00 1931 u32 diff_size = from_size + to_size;
7d672345
DB		 1932 int i, j = 0;
1933
1934 /* This is quite flexible, some examples:
1935 *
1936 * from_size == 0, to_size > 0, seed := csum --> pushing data
1937 * from_size > 0, to_size == 0, seed := csum --> pulling data
1938 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1939 *
1940 * Even for diffing, from_size and to_size don't need to be equal.
1941 */
1942 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1943 diff_size > sizeof(sp->diff)))
1944 return -EINVAL;
1945
1946 for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1947 sp->diff[j] = ~from[i];
1948 for (i = 0; i < to_size / sizeof(__be32); i++, j++)
1949 sp->diff[j] = to[i];
1950
1951 return csum_partial(sp->diff, diff_size, seed);
1952}
1953
577c50aa 1954static const struct bpf_func_proto bpf_csum_diff_proto = {
7d672345
DB		 1955 .func = bpf_csum_diff,
1956 .gpl_only = false,
36bbef52 1957 .pkt_access = true,
7d672345 1958 .ret_type = RET_INTEGER,
db1ac496 1959 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1960 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
db1ac496 1961 .arg3_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1962 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
7d672345
DB		 1963 .arg5_type = ARG_ANYTHING,
1964};
1965
36bbef52
DB		 1966BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
1967{
1968 /* The interface is to be used in combination with bpf_csum_diff()
1969 * for direct packet writes. csum rotation for alignment as well
1970 * as emulating csum_sub() can be done from the eBPF program.
1971 */
1972 if (skb->ip_summed == CHECKSUM_COMPLETE)
1973 return (skb->csum = csum_add(skb->csum, csum));
1974
1975 return -ENOTSUPP;
1976}
1977
1978static const struct bpf_func_proto bpf_csum_update_proto = {
1979 .func = bpf_csum_update,
1980 .gpl_only = false,
1981 .ret_type = RET_INTEGER,
1982 .arg1_type = ARG_PTR_TO_CTX,
1983 .arg2_type = ARG_ANYTHING,
1984};
1985
a70b506e
DB		 1986static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
1987{
a70b506e
DB		 1988 return dev_forward_skb(dev, skb);
1989}
1990
4e3264d2
MKL		 1991static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
1992 struct sk_buff *skb)
1993{
1994 int ret = ____dev_forward_skb(dev, skb);
1995
1996 if (likely(!ret)) {
1997 skb->dev = dev;
1998 ret = netif_rx(skb);
1999 }
2000
2001 return ret;
2002}
2003
a70b506e
DB		 2004static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2005{
2006 int ret;
2007
2008 if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) {
2009 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2010 kfree_skb(skb);
2011 return -ENETDOWN;
2012 }
2013
2014 skb->dev = dev;
2015
2016 __this_cpu_inc(xmit_recursion);
2017 ret = dev_queue_xmit(skb);
2018 __this_cpu_dec(xmit_recursion);
2019
2020 return ret;
2021}
2022
4e3264d2
MKL		 2023static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2024 u32 flags)
2025{
2026 /* skb->mac_len is not set on normal egress */
2027 unsigned int mlen = skb->network_header - skb->mac_header;
2028
2029 __skb_pull(skb, mlen);
2030
2031 /* At ingress, the mac header has already been pulled once.
2032 * At egress, skb_pospull_rcsum has to be done in case that
2033 * the skb is originated from ingress (i.e. a forwarded skb)
2034 * to ensure that rcsum starts at net header.
2035 */
2036 if (!skb_at_tc_ingress(skb))
2037 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
2038 skb_pop_mac_header(skb);
2039 skb_reset_mac_len(skb);
2040 return flags & BPF_F_INGRESS ?
2041 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
2042}
2043
2044static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2045 u32 flags)
2046{
3a0af8fd
TG		 2047 /* Verify that a link layer header is carried */
2048 if (unlikely(skb->mac_header >= skb->network_header)) {
2049 kfree_skb(skb);
2050 return -ERANGE;
2051 }
2052
4e3264d2
MKL		 2053 bpf_push_mac_rcsum(skb);
2054 return flags & BPF_F_INGRESS ?
2055 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2056}
2057
2058static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2059 u32 flags)
2060{
c491680f 2061 if (dev_is_mac_header_xmit(dev))
4e3264d2 2062 return __bpf_redirect_common(skb, dev, flags);
c491680f
DB		 2063 else
2064 return __bpf_redirect_no_mac(skb, dev, flags);
4e3264d2
MKL		 2065}
2066
f3694e00 2067BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
3896d655 2068{
3896d655 2069 struct net_device *dev;
36bbef52
DB		 2070 struct sk_buff *clone;
2071 int ret;
3896d655 2072
781c53bc
DB		 2073 if (unlikely(flags & ~(BPF_F_INGRESS)))
2074 return -EINVAL;
2075
3896d655
AS		 2076 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2077 if (unlikely(!dev))
2078 return -EINVAL;
2079
36bbef52
DB		 2080 clone = skb_clone(skb, GFP_ATOMIC);
2081 if (unlikely(!clone))
3896d655
AS		 2082 return -ENOMEM;
2083
36bbef52
DB		 2084 /* For direct write, we need to keep the invariant that the skbs
2085 * we're dealing with need to be uncloned. Should uncloning fail
2086 * here, we need to free the just generated clone to unclone once
2087 * again.
2088 */
2089 ret = bpf_try_make_head_writable(skb);
2090 if (unlikely(ret)) {
2091 kfree_skb(clone);
2092 return -ENOMEM;
2093 }
2094
4e3264d2 2095 return __bpf_redirect(clone, dev, flags);
3896d655
AS		 2096}
2097
577c50aa 2098static const struct bpf_func_proto bpf_clone_redirect_proto = {
3896d655
AS		 2099 .func = bpf_clone_redirect,
2100 .gpl_only = false,
2101 .ret_type = RET_INTEGER,
2102 .arg1_type = ARG_PTR_TO_CTX,
2103 .arg2_type = ARG_ANYTHING,
2104 .arg3_type = ARG_ANYTHING,
2105};
2106
0b19cc0a
TM		 2107DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2108EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
781c53bc 2109
f3694e00 2110BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
27b29f63 2111{
0b19cc0a 2112 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
27b29f63 2113
781c53bc
DB		 2114 if (unlikely(flags & ~(BPF_F_INGRESS)))
2115 return TC_ACT_SHOT;
2116
27b29f63
AS		 2117 ri->ifindex = ifindex;
2118 ri->flags = flags;
781c53bc 2119
27b29f63
AS		 2120 return TC_ACT_REDIRECT;
2121}
2122
2123int skb_do_redirect(struct sk_buff *skb)
2124{
0b19cc0a 2125 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
27b29f63
AS		 2126 struct net_device *dev;
2127
2128 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
2129 ri->ifindex = 0;
2130 if (unlikely(!dev)) {
2131 kfree_skb(skb);
2132 return -EINVAL;
2133 }
2134
4e3264d2 2135 return __bpf_redirect(skb, dev, ri->flags);
27b29f63
AS		 2136}
2137
577c50aa 2138static const struct bpf_func_proto bpf_redirect_proto = {
27b29f63
AS		 2139 .func = bpf_redirect,
2140 .gpl_only = false,
2141 .ret_type = RET_INTEGER,
2142 .arg1_type = ARG_ANYTHING,
2143 .arg2_type = ARG_ANYTHING,
2144};
2145
604326b4 2146BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes)
2a100317
JF		 2147{
2148 msg->apply_bytes = bytes;
2149 return 0;
2150}
2151
2152static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2153 .func = bpf_msg_apply_bytes,
2154 .gpl_only = false,
2155 .ret_type = RET_INTEGER,
2156 .arg1_type = ARG_PTR_TO_CTX,
2157 .arg2_type = ARG_ANYTHING,
2158};
2159
604326b4 2160BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes)
91843d54
JF		 2161{
2162 msg->cork_bytes = bytes;
2163 return 0;
2164}
2165
2166static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2167 .func = bpf_msg_cork_bytes,
2168 .gpl_only = false,
2169 .ret_type = RET_INTEGER,
2170 .arg1_type = ARG_PTR_TO_CTX,
2171 .arg2_type = ARG_ANYTHING,
2172};
2173
604326b4
DB		 2174BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
2175 u32, end, u64, flags)
015632bb 2176{
604326b4
DB		 2177 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
2178 u32 first_sge, last_sge, i, shift, bytes_sg_total;
2179 struct scatterlist *sge;
2180 u8 *raw, *to, *from;
015632bb
JF		 2181 struct page *page;
2182
2183 if (unlikely(flags || end <= start))
2184 return -EINVAL;
2185
2186 /* First find the starting scatterlist element */
604326b4 2187 i = msg->sg.start;
015632bb 2188 do {
604326b4 2189 len = sk_msg_elem(msg, i)->length;
015632bb
JF		 2190 if (start < offset + len)
2191 break;
5b24109b 2192 offset += len;
604326b4
DB		 2193 sk_msg_iter_var_next(i);
2194 } while (i != msg->sg.end);
015632bb
JF		 2195
2196 if (unlikely(start >= offset + len))
2197 return -EINVAL;
2198
604326b4 2199 first_sge = i;
5b24109b
DB		 2200 /* The start may point into the sg element so we need to also
2201 * account for the headroom.
2202 */
2203 bytes_sg_total = start - offset + bytes;
604326b4 2204 if (!msg->sg.copy[i] && bytes_sg_total <= len)
015632bb 2205 goto out;
015632bb
JF		 2206
2207 /* At this point we need to linearize multiple scatterlist
2208 * elements or a single shared page. Either way we need to
2209 * copy into a linear buffer exclusively owned by BPF. Then
2210 * place the buffer in the scatterlist and fixup the original
2211 * entries by removing the entries now in the linear buffer
2212 * and shifting the remaining entries. For now we do not try
2213 * to copy partial entries to avoid complexity of running out
2214 * of sg_entry slots. The downside is reading a single byte
2215 * will copy the entire sg entry.
2216 */
2217 do {
604326b4
DB		 2218 copy += sk_msg_elem(msg, i)->length;
2219 sk_msg_iter_var_next(i);
5b24109b 2220 if (bytes_sg_total <= copy)
015632bb 2221 break;
604326b4
DB		 2222 } while (i != msg->sg.end);
2223 last_sge = i;
015632bb 2224
5b24109b 2225 if (unlikely(bytes_sg_total > copy))
015632bb
JF		 2226 return -EINVAL;
2227
4c3d795c
TD		 2228 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2229 get_order(copy));
015632bb
JF		 2230 if (unlikely(!page))
2231 return -ENOMEM;
015632bb 2232
604326b4
DB		 2233 raw = page_address(page);
2234 i = first_sge;
015632bb 2235 do {
604326b4
DB		 2236 sge = sk_msg_elem(msg, i);
2237 from = sg_virt(sge);
2238 len = sge->length;
2239 to = raw + poffset;
015632bb
JF		 2240
2241 memcpy(to, from, len);
9db39f4d 2242 poffset += len;
604326b4
DB		 2243 sge->length = 0;
2244 put_page(sg_page(sge));
015632bb 2245
604326b4
DB		 2246 sk_msg_iter_var_next(i);
2247 } while (i != last_sge);
015632bb 2248
604326b4 2249 sg_set_page(&msg->sg.data[first_sge], page, copy, 0);
015632bb
JF		 2250
2251 /* To repair sg ring we need to shift entries. If we only
2252 * had a single entry though we can just replace it and
2253 * be done. Otherwise walk the ring and shift the entries.
2254 */
604326b4
DB		 2255 WARN_ON_ONCE(last_sge == first_sge);
2256 shift = last_sge > first_sge ?
2257 last_sge - first_sge - 1 :
2258 MAX_SKB_FRAGS - first_sge + last_sge - 1;
015632bb
JF		 2259 if (!shift)
2260 goto out;
2261
604326b4
DB		 2262 i = first_sge;
2263 sk_msg_iter_var_next(i);
015632bb 2264 do {
604326b4 2265 u32 move_from;
015632bb 2266
604326b4
DB		 2267 if (i + shift >= MAX_MSG_FRAGS)
2268 move_from = i + shift - MAX_MSG_FRAGS;
015632bb
JF		 2269 else
2270 move_from = i + shift;
604326b4 2271 if (move_from == msg->sg.end)
015632bb
JF		 2272 break;
2273
604326b4
DB		 2274 msg->sg.data[i] = msg->sg.data[move_from];
2275 msg->sg.data[move_from].length = 0;
2276 msg->sg.data[move_from].page_link = 0;
2277 msg->sg.data[move_from].offset = 0;
2278 sk_msg_iter_var_next(i);
015632bb 2279 } while (1);
604326b4
DB		 2280
2281 msg->sg.end = msg->sg.end - shift > msg->sg.end ?
2282 msg->sg.end - shift + MAX_MSG_FRAGS :
2283 msg->sg.end - shift;
015632bb 2284out:
604326b4 2285 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
015632bb 2286 msg->data_end = msg->data + bytes;
015632bb
JF		 2287 return 0;
2288}
2289
2290static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2291 .func = bpf_msg_pull_data,
2292 .gpl_only = false,
2293 .ret_type = RET_INTEGER,
2294 .arg1_type = ARG_PTR_TO_CTX,
2295 .arg2_type = ARG_ANYTHING,
2296 .arg3_type = ARG_ANYTHING,
2297 .arg4_type = ARG_ANYTHING,
2298};
2299
f3694e00 2300BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
8d20aabe 2301{
f3694e00 2302 return task_get_classid(skb);
8d20aabe
DB		 2303}
2304
2305static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
2306 .func = bpf_get_cgroup_classid,
2307 .gpl_only = false,
2308 .ret_type = RET_INTEGER,
2309 .arg1_type = ARG_PTR_TO_CTX,
2310};
2311
f3694e00 2312BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
c46646d0 2313{
f3694e00 2314 return dst_tclassid(skb);
c46646d0
DB		 2315}
2316
2317static const struct bpf_func_proto bpf_get_route_realm_proto = {
2318 .func = bpf_get_route_realm,
2319 .gpl_only = false,
2320 .ret_type = RET_INTEGER,
2321 .arg1_type = ARG_PTR_TO_CTX,
2322};
2323
f3694e00 2324BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
13c5c240
DB		 2325{
2326 /* If skb_clear_hash() was called due to mangling, we can
2327 * trigger SW recalculation here. Later access to hash
2328 * can then use the inline skb->hash via context directly
2329 * instead of calling this helper again.
2330 */
f3694e00 2331 return skb_get_hash(skb);
13c5c240
DB		 2332}
2333
2334static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
2335 .func = bpf_get_hash_recalc,
2336 .gpl_only = false,
2337 .ret_type = RET_INTEGER,
2338 .arg1_type = ARG_PTR_TO_CTX,
2339};
2340
7a4b28c6
DB		 2341BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
2342{
2343 /* After all direct packet write, this can be used once for
2344 * triggering a lazy recalc on next skb_get_hash() invocation.
2345 */
2346 skb_clear_hash(skb);
2347 return 0;
2348}
2349
2350static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
2351 .func = bpf_set_hash_invalid,
2352 .gpl_only = false,
2353 .ret_type = RET_INTEGER,
2354 .arg1_type = ARG_PTR_TO_CTX,
2355};
2356
ded092cd
DB		 2357BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
2358{
2359 /* Set user specified hash as L4(+), so that it gets returned
2360 * on skb_get_hash() call unless BPF prog later on triggers a
2361 * skb_clear_hash().
2362 */
2363 __skb_set_sw_hash(skb, hash, true);
2364 return 0;
2365}
2366
2367static const struct bpf_func_proto bpf_set_hash_proto = {
2368 .func = bpf_set_hash,
2369 .gpl_only = false,
2370 .ret_type = RET_INTEGER,
2371 .arg1_type = ARG_PTR_TO_CTX,
2372 .arg2_type = ARG_ANYTHING,
2373};
2374
f3694e00
DB		 2375BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
2376 u16, vlan_tci)
4e10df9a 2377{
db58ba45 2378 int ret;
4e10df9a
AS		 2379
2380 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
2381 vlan_proto != htons(ETH_P_8021AD)))
2382 vlan_proto = htons(ETH_P_8021Q);
2383
8065694e 2384 bpf_push_mac_rcsum(skb);
db58ba45 2385 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
8065694e
DB		 2386 bpf_pull_mac_rcsum(skb);
2387
6aaae2b6 2388 bpf_compute_data_pointers(skb);
db58ba45 2389 return ret;
4e10df9a
AS		 2390}
2391
93731ef0 2392static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
4e10df9a
AS		 2393 .func = bpf_skb_vlan_push,
2394 .gpl_only = false,
2395 .ret_type = RET_INTEGER,
2396 .arg1_type = ARG_PTR_TO_CTX,
2397 .arg2_type = ARG_ANYTHING,
2398 .arg3_type = ARG_ANYTHING,
2399};
2400
f3694e00 2401BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
4e10df9a 2402{
db58ba45 2403 int ret;
4e10df9a 2404
8065694e 2405 bpf_push_mac_rcsum(skb);
db58ba45 2406 ret = skb_vlan_pop(skb);
8065694e
DB		 2407 bpf_pull_mac_rcsum(skb);
2408
6aaae2b6 2409 bpf_compute_data_pointers(skb);
db58ba45 2410 return ret;
4e10df9a
AS		 2411}
2412
93731ef0 2413static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
4e10df9a
AS		 2414 .func = bpf_skb_vlan_pop,
2415 .gpl_only = false,
2416 .ret_type = RET_INTEGER,
2417 .arg1_type = ARG_PTR_TO_CTX,
2418};
2419
6578171a
DB		 2420static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2421{
2422 /* Caller already did skb_cow() with len as headroom,
2423 * so no need to do it here.
2424 */
2425 skb_push(skb, len);
2426 memmove(skb->data, skb->data + len, off);
2427 memset(skb->data + off, 0, len);
2428
2429 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2430 * needed here as it does not change the skb->csum
2431 * result for checksum complete when summing over
2432 * zeroed blocks.
2433 */
2434 return 0;
2435}
2436
2437static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2438{
2439 /* skb_ensure_writable() is not needed here, as we're
2440 * already working on an uncloned skb.
2441 */
2442 if (unlikely(!pskb_may_pull(skb, off + len)))
2443 return -ENOMEM;
2444
2445 skb_postpull_rcsum(skb, skb->data + off, len);
2446 memmove(skb->data + len, skb->data, off);
2447 __skb_pull(skb, len);
2448
2449 return 0;
2450}
2451
2452static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2453{
2454 bool trans_same = skb->transport_header == skb->network_header;
2455 int ret;
2456
2457 /* There's no need for __skb_push()/__skb_pull() pair to
2458 * get to the start of the mac header as we're guaranteed
2459 * to always start from here under eBPF.
2460 */
2461 ret = bpf_skb_generic_push(skb, off, len);
2462 if (likely(!ret)) {
2463 skb->mac_header -= len;
2464 skb->network_header -= len;
2465 if (trans_same)
2466 skb->transport_header = skb->network_header;
2467 }
2468
2469 return ret;
2470}
2471
2472static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2473{
2474 bool trans_same = skb->transport_header == skb->network_header;
2475 int ret;
2476
2477 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2478 ret = bpf_skb_generic_pop(skb, off, len);
2479 if (likely(!ret)) {
2480 skb->mac_header += len;
2481 skb->network_header += len;
2482 if (trans_same)
2483 skb->transport_header = skb->network_header;
2484 }
2485
2486 return ret;
2487}
2488
2489static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2490{
2491 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2492 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2493 int ret;
2494
d02f51cb
DA		 2495 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2496 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2497 return -ENOTSUPP;
2498
6578171a
DB		 2499 ret = skb_cow(skb, len_diff);
2500 if (unlikely(ret < 0))
2501 return ret;
2502
2503 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2504 if (unlikely(ret < 0))
2505 return ret;
2506
2507 if (skb_is_gso(skb)) {
d02f51cb
DA		 2508 struct skb_shared_info *shinfo = skb_shinfo(skb);
2509
880388aa
DM		 2510 /* SKB_GSO_TCPV4 needs to be changed into
2511 * SKB_GSO_TCPV6.
6578171a 2512 */
d02f51cb
DA		 2513 if (shinfo->gso_type & SKB_GSO_TCPV4) {
2514 shinfo->gso_type &= ~SKB_GSO_TCPV4;
2515 shinfo->gso_type |= SKB_GSO_TCPV6;
6578171a
DB		 2516 }
2517
2518 /* Due to IPv6 header, MSS needs to be downgraded. */
d02f51cb 2519 skb_decrease_gso_size(shinfo, len_diff);
6578171a 2520 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2521 shinfo->gso_type |= SKB_GSO_DODGY;
2522 shinfo->gso_segs = 0;
6578171a
DB		 2523 }
2524
2525 skb->protocol = htons(ETH_P_IPV6);
2526 skb_clear_hash(skb);
2527
2528 return 0;
2529}
2530
2531static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2532{
2533 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2534 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2535 int ret;
2536
d02f51cb
DA		 2537 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2538 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2539 return -ENOTSUPP;
2540
6578171a
DB		 2541 ret = skb_unclone(skb, GFP_ATOMIC);
2542 if (unlikely(ret < 0))
2543 return ret;
2544
2545 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2546 if (unlikely(ret < 0))
2547 return ret;
2548
2549 if (skb_is_gso(skb)) {
d02f51cb
DA		 2550 struct skb_shared_info *shinfo = skb_shinfo(skb);
2551
880388aa
DM		 2552 /* SKB_GSO_TCPV6 needs to be changed into
2553 * SKB_GSO_TCPV4.
6578171a 2554 */
d02f51cb
DA		 2555 if (shinfo->gso_type & SKB_GSO_TCPV6) {
2556 shinfo->gso_type &= ~SKB_GSO_TCPV6;
2557 shinfo->gso_type |= SKB_GSO_TCPV4;
6578171a
DB		 2558 }
2559
2560 /* Due to IPv4 header, MSS can be upgraded. */
d02f51cb 2561 skb_increase_gso_size(shinfo, len_diff);
6578171a 2562 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2563 shinfo->gso_type |= SKB_GSO_DODGY;
2564 shinfo->gso_segs = 0;
6578171a
DB		 2565 }
2566
2567 skb->protocol = htons(ETH_P_IP);
2568 skb_clear_hash(skb);
2569
2570 return 0;
2571}
2572
2573static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2574{
2575 __be16 from_proto = skb->protocol;
2576
2577 if (from_proto == htons(ETH_P_IP) &&
2578 to_proto == htons(ETH_P_IPV6))
2579 return bpf_skb_proto_4_to_6(skb);
2580
2581 if (from_proto == htons(ETH_P_IPV6) &&
2582 to_proto == htons(ETH_P_IP))
2583 return bpf_skb_proto_6_to_4(skb);
2584
2585 return -ENOTSUPP;
2586}
2587
f3694e00
DB		 2588BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2589 u64, flags)
6578171a 2590{
6578171a
DB		 2591 int ret;
2592
2593 if (unlikely(flags))
2594 return -EINVAL;
2595
2596 /* General idea is that this helper does the basic groundwork
2597 * needed for changing the protocol, and eBPF program fills the
2598 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2599 * and other helpers, rather than passing a raw buffer here.
2600 *
2601 * The rationale is to keep this minimal and without a need to
2602 * deal with raw packet data. F.e. even if we would pass buffers
2603 * here, the program still needs to call the bpf_lX_csum_replace()
2604 * helpers anyway. Plus, this way we keep also separation of
2605 * concerns, since f.e. bpf_skb_store_bytes() should only take
2606 * care of stores.
2607 *
2608 * Currently, additional options and extension header space are
2609 * not supported, but flags register is reserved so we can adapt
2610 * that. For offloads, we mark packet as dodgy, so that headers
2611 * need to be verified first.
2612 */
2613 ret = bpf_skb_proto_xlat(skb, proto);
6aaae2b6 2614 bpf_compute_data_pointers(skb);
6578171a
DB		 2615 return ret;
2616}
2617
2618static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2619 .func = bpf_skb_change_proto,
2620 .gpl_only = false,
2621 .ret_type = RET_INTEGER,
2622 .arg1_type = ARG_PTR_TO_CTX,
2623 .arg2_type = ARG_ANYTHING,
2624 .arg3_type = ARG_ANYTHING,
2625};
2626
f3694e00 2627BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
d2485c42 2628{
d2485c42 2629 /* We only allow a restricted subset to be changed for now. */
45c7fffa
DB		 2630 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2631 !skb_pkt_type_ok(pkt_type)))
d2485c42
DB		 2632 return -EINVAL;
2633
2634 skb->pkt_type = pkt_type;
2635 return 0;
2636}
2637
2638static const struct bpf_func_proto bpf_skb_change_type_proto = {
2639 .func = bpf_skb_change_type,
2640 .gpl_only = false,
2641 .ret_type = RET_INTEGER,
2642 .arg1_type = ARG_PTR_TO_CTX,
2643 .arg2_type = ARG_ANYTHING,
2644};
2645
2be7e212
DB		 2646static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2647{
2648 switch (skb->protocol) {
2649 case htons(ETH_P_IP):
2650 return sizeof(struct iphdr);
2651 case htons(ETH_P_IPV6):
2652 return sizeof(struct ipv6hdr);
2653 default:
2654 return ~0U;
2655 }
2656}
2657
2658static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff)
2659{
2660 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2661 int ret;
2662
d02f51cb
DA		 2663 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2664 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2665 return -ENOTSUPP;
2666
2be7e212
DB		 2667 ret = skb_cow(skb, len_diff);
2668 if (unlikely(ret < 0))
2669 return ret;
2670
2671 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2672 if (unlikely(ret < 0))
2673 return ret;
2674
2675 if (skb_is_gso(skb)) {
d02f51cb
DA		 2676 struct skb_shared_info *shinfo = skb_shinfo(skb);
2677
2be7e212 2678 /* Due to header grow, MSS needs to be downgraded. */
d02f51cb 2679 skb_decrease_gso_size(shinfo, len_diff);
2be7e212 2680 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2681 shinfo->gso_type |= SKB_GSO_DODGY;
2682 shinfo->gso_segs = 0;
2be7e212
DB		 2683 }
2684
2685 return 0;
2686}
2687
2688static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff)
2689{
2690 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2691 int ret;
2692
d02f51cb
DA		 2693 /* SCTP uses GSO_BY_FRAGS, thus cannot adjust it. */
2694 if (skb_is_gso(skb) && unlikely(skb_is_gso_sctp(skb)))
2695 return -ENOTSUPP;
2696
2be7e212
DB		 2697 ret = skb_unclone(skb, GFP_ATOMIC);
2698 if (unlikely(ret < 0))
2699 return ret;
2700
2701 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2702 if (unlikely(ret < 0))
2703 return ret;
2704
2705 if (skb_is_gso(skb)) {
d02f51cb
DA		 2706 struct skb_shared_info *shinfo = skb_shinfo(skb);
2707
2be7e212 2708 /* Due to header shrink, MSS can be upgraded. */
d02f51cb 2709 skb_increase_gso_size(shinfo, len_diff);
2be7e212 2710 /* Header must be checked, and gso_segs recomputed. */
d02f51cb
DA		 2711 shinfo->gso_type |= SKB_GSO_DODGY;
2712 shinfo->gso_segs = 0;
2be7e212
DB		 2713 }
2714
2715 return 0;
2716}
2717
2718static u32 __bpf_skb_max_len(const struct sk_buff *skb)
2719{
0c6bc6e5
JF		 2720 return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
2721 SKB_MAX_ALLOC;
2be7e212
DB		 2722}
2723
2724static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
2725{
2726 bool trans_same = skb->transport_header == skb->network_header;
2727 u32 len_cur, len_diff_abs = abs(len_diff);
2728 u32 len_min = bpf_skb_net_base_len(skb);
2729 u32 len_max = __bpf_skb_max_len(skb);
2730 __be16 proto = skb->protocol;
2731 bool shrink = len_diff < 0;
2732 int ret;
2733
2734 if (unlikely(len_diff_abs > 0xfffU))
2735 return -EFAULT;
2736 if (unlikely(proto != htons(ETH_P_IP) &&
2737 proto != htons(ETH_P_IPV6)))
2738 return -ENOTSUPP;
2739
2740 len_cur = skb->len - skb_network_offset(skb);
2741 if (skb_transport_header_was_set(skb) && !trans_same)
2742 len_cur = skb_network_header_len(skb);
2743 if ((shrink && (len_diff_abs >= len_cur ||
2744 len_cur - len_diff_abs < len_min)) ||
2745 (!shrink && (skb->len + len_diff_abs > len_max &&
2746 !skb_is_gso(skb))))
2747 return -ENOTSUPP;
2748
2749 ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) :
2750 bpf_skb_net_grow(skb, len_diff_abs);
2751
6aaae2b6 2752 bpf_compute_data_pointers(skb);
e4a6a342 2753 return ret;
2be7e212
DB		 2754}
2755
2756BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
2757 u32, mode, u64, flags)
2758{
2759 if (unlikely(flags))
2760 return -EINVAL;
2761 if (likely(mode == BPF_ADJ_ROOM_NET))
2762 return bpf_skb_adjust_net(skb, len_diff);
2763
2764 return -ENOTSUPP;
2765}
2766
2767static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
2768 .func = bpf_skb_adjust_room,
2769 .gpl_only = false,
2770 .ret_type = RET_INTEGER,
2771 .arg1_type = ARG_PTR_TO_CTX,
2772 .arg2_type = ARG_ANYTHING,
2773 .arg3_type = ARG_ANYTHING,
2774 .arg4_type = ARG_ANYTHING,
2775};
2776
5293efe6
DB		 2777static u32 __bpf_skb_min_len(const struct sk_buff *skb)
2778{
2779 u32 min_len = skb_network_offset(skb);
2780
2781 if (skb_transport_header_was_set(skb))
2782 min_len = skb_transport_offset(skb);
2783 if (skb->ip_summed == CHECKSUM_PARTIAL)
2784 min_len = skb_checksum_start_offset(skb) +
2785 skb->csum_offset + sizeof(__sum16);
2786 return min_len;
2787}
2788
5293efe6
DB		 2789static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
2790{
2791 unsigned int old_len = skb->len;
2792 int ret;
2793
2794 ret = __skb_grow_rcsum(skb, new_len);
2795 if (!ret)
2796 memset(skb->data + old_len, 0, new_len - old_len);
2797 return ret;
2798}
2799
2800static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
2801{
2802 return __skb_trim_rcsum(skb, new_len);
2803}
2804
0ea488ff
JF		 2805static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
2806 u64 flags)
5293efe6 2807{
5293efe6
DB		 2808 u32 max_len = __bpf_skb_max_len(skb);
2809 u32 min_len = __bpf_skb_min_len(skb);
5293efe6
DB		 2810 int ret;
2811
2812 if (unlikely(flags || new_len > max_len || new_len < min_len))
2813 return -EINVAL;
2814 if (skb->encapsulation)
2815 return -ENOTSUPP;
2816
2817 /* The basic idea of this helper is that it's performing the
2818 * needed work to either grow or trim an skb, and eBPF program
2819 * rewrites the rest via helpers like bpf_skb_store_bytes(),
2820 * bpf_lX_csum_replace() and others rather than passing a raw
2821 * buffer here. This one is a slow path helper and intended
2822 * for replies with control messages.
2823 *
2824 * Like in bpf_skb_change_proto(), we want to keep this rather
2825 * minimal and without protocol specifics so that we are able
2826 * to separate concerns as in bpf_skb_store_bytes() should only
2827 * be the one responsible for writing buffers.
2828 *
2829 * It's really expected to be a slow path operation here for
2830 * control message replies, so we're implicitly linearizing,
2831 * uncloning and drop offloads from the skb by this.
2832 */
2833 ret = __bpf_try_make_writable(skb, skb->len);
2834 if (!ret) {
2835 if (new_len > skb->len)
2836 ret = bpf_skb_grow_rcsum(skb, new_len);
2837 else if (new_len < skb->len)
2838 ret = bpf_skb_trim_rcsum(skb, new_len);
2839 if (!ret && skb_is_gso(skb))
2840 skb_gso_reset(skb);
2841 }
0ea488ff
JF		 2842 return ret;
2843}
2844
2845BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
2846 u64, flags)
2847{
2848 int ret = __bpf_skb_change_tail(skb, new_len, flags);
5293efe6 2849
6aaae2b6 2850 bpf_compute_data_pointers(skb);
5293efe6
DB		 2851 return ret;
2852}
2853
2854static const struct bpf_func_proto bpf_skb_change_tail_proto = {
2855 .func = bpf_skb_change_tail,
2856 .gpl_only = false,
2857 .ret_type = RET_INTEGER,
2858 .arg1_type = ARG_PTR_TO_CTX,
2859 .arg2_type = ARG_ANYTHING,
2860 .arg3_type = ARG_ANYTHING,
2861};
2862
0ea488ff 2863BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3a0af8fd 2864 u64, flags)
0ea488ff
JF		 2865{
2866 int ret = __bpf_skb_change_tail(skb, new_len, flags);
2867
2868 bpf_compute_data_end_sk_skb(skb);
2869 return ret;
2870}
2871
2872static const struct bpf_func_proto sk_skb_change_tail_proto = {
2873 .func = sk_skb_change_tail,
2874 .gpl_only = false,
2875 .ret_type = RET_INTEGER,
2876 .arg1_type = ARG_PTR_TO_CTX,
2877 .arg2_type = ARG_ANYTHING,
2878 .arg3_type = ARG_ANYTHING,
2879};
2880
2881static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
2882 u64 flags)
3a0af8fd
TG		 2883{
2884 u32 max_len = __bpf_skb_max_len(skb);
2885 u32 new_len = skb->len + head_room;
2886 int ret;
2887
2888 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
2889 new_len < skb->len))
2890 return -EINVAL;
2891
2892 ret = skb_cow(skb, head_room);
2893 if (likely(!ret)) {
2894 /* Idea for this helper is that we currently only
2895 * allow to expand on mac header. This means that
2896 * skb->protocol network header, etc, stay as is.
2897 * Compared to bpf_skb_change_tail(), we're more
2898 * flexible due to not needing to linearize or
2899 * reset GSO. Intention for this helper is to be
2900 * used by an L3 skb that needs to push mac header
2901 * for redirection into L2 device.
2902 */
2903 __skb_push(skb, head_room);
2904 memset(skb->data, 0, head_room);
2905 skb_reset_mac_header(skb);
2906 }
2907
0ea488ff
JF		 2908 return ret;
2909}
2910
2911BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
2912 u64, flags)
2913{
2914 int ret = __bpf_skb_change_head(skb, head_room, flags);
2915
6aaae2b6 2916 bpf_compute_data_pointers(skb);
0ea488ff 2917 return ret;
3a0af8fd
TG		 2918}
2919
2920static const struct bpf_func_proto bpf_skb_change_head_proto = {
2921 .func = bpf_skb_change_head,
2922 .gpl_only = false,
2923 .ret_type = RET_INTEGER,
2924 .arg1_type = ARG_PTR_TO_CTX,
2925 .arg2_type = ARG_ANYTHING,
2926 .arg3_type = ARG_ANYTHING,
2927};
2928
0ea488ff
JF		 2929BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
2930 u64, flags)
2931{
2932 int ret = __bpf_skb_change_head(skb, head_room, flags);
2933
2934 bpf_compute_data_end_sk_skb(skb);
2935 return ret;
2936}
2937
2938static const struct bpf_func_proto sk_skb_change_head_proto = {
2939 .func = sk_skb_change_head,
2940 .gpl_only = false,
2941 .ret_type = RET_INTEGER,
2942 .arg1_type = ARG_PTR_TO_CTX,
2943 .arg2_type = ARG_ANYTHING,
2944 .arg3_type = ARG_ANYTHING,
2945};
de8f3a83
DB		 2946static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
2947{
2948 return xdp_data_meta_unsupported(xdp) ? 0 :
2949 xdp->data - xdp->data_meta;
2950}
2951
17bedab2
MKL		 2952BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
2953{
6dfb970d 2954 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
de8f3a83 2955 unsigned long metalen = xdp_get_metalen(xdp);
97e19cce 2956 void *data_start = xdp_frame_end + metalen;
17bedab2
MKL		 2957 void *data = xdp->data + offset;
2958
de8f3a83 2959 if (unlikely(data < data_start ||
17bedab2
MKL		 2960 data > xdp->data_end - ETH_HLEN))
2961 return -EINVAL;
2962
de8f3a83
DB		 2963 if (metalen)
2964 memmove(xdp->data_meta + offset,
2965 xdp->data_meta, metalen);
2966 xdp->data_meta += offset;
17bedab2
MKL		 2967 xdp->data = data;
2968
2969 return 0;
2970}
2971
2972static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
2973 .func = bpf_xdp_adjust_head,
2974 .gpl_only = false,
2975 .ret_type = RET_INTEGER,
2976 .arg1_type = ARG_PTR_TO_CTX,
2977 .arg2_type = ARG_ANYTHING,
2978};
2979
b32cc5b9
NS		 2980BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
2981{
2982 void *data_end = xdp->data_end + offset;
2983
2984 /* only shrinking is allowed for now. */
2985 if (unlikely(offset >= 0))
2986 return -EINVAL;
2987
2988 if (unlikely(data_end < xdp->data + ETH_HLEN))
2989 return -EINVAL;
2990
2991 xdp->data_end = data_end;
2992
2993 return 0;
2994}
2995
2996static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
2997 .func = bpf_xdp_adjust_tail,
2998 .gpl_only = false,
2999 .ret_type = RET_INTEGER,
3000 .arg1_type = ARG_PTR_TO_CTX,
3001 .arg2_type = ARG_ANYTHING,
3002};
3003
de8f3a83
DB		 3004BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
3005{
97e19cce 3006 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
de8f3a83
DB		 3007 void *meta = xdp->data_meta + offset;
3008 unsigned long metalen = xdp->data - meta;
3009
3010 if (xdp_data_meta_unsupported(xdp))
3011 return -ENOTSUPP;
97e19cce 3012 if (unlikely(meta < xdp_frame_end ||
de8f3a83
DB		 3013 meta > xdp->data))
3014 return -EINVAL;
3015 if (unlikely((metalen & (sizeof(__u32) - 1)) ||
3016 (metalen > 32)))
3017 return -EACCES;
3018
3019 xdp->data_meta = meta;
3020
3021 return 0;
3022}
3023
3024static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
3025 .func = bpf_xdp_adjust_meta,
3026 .gpl_only = false,
3027 .ret_type = RET_INTEGER,
3028 .arg1_type = ARG_PTR_TO_CTX,
3029 .arg2_type = ARG_ANYTHING,
3030};
3031
11393cc9
JF		 3032static int __bpf_tx_xdp(struct net_device *dev,
3033 struct bpf_map *map,
3034 struct xdp_buff *xdp,
3035 u32 index)
814abfab 3036{
44fa2dbd 3037 struct xdp_frame *xdpf;
d8d7218a 3038 int err, sent;
11393cc9
JF		 3039
3040 if (!dev->netdev_ops->ndo_xdp_xmit) {
11393cc9 3041 return -EOPNOTSUPP;
814abfab 3042 }
11393cc9 3043
d8d7218a
TM		 3044 err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data);
3045 if (unlikely(err))
3046 return err;
3047
44fa2dbd
JDB		 3048 xdpf = convert_to_xdp_frame(xdp);
3049 if (unlikely(!xdpf))
3050 return -EOVERFLOW;
3051
1e67575a 3052 sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH);
735fc405
JDB		 3053 if (sent <= 0)
3054 return sent;
9c270af3
JDB		 3055 return 0;
3056}
3057
47b123ed
JDB		 3058static noinline int
3059xdp_do_redirect_slow(struct net_device *dev, struct xdp_buff *xdp,
3060 struct bpf_prog *xdp_prog, struct bpf_redirect_info *ri)
3061{
3062 struct net_device *fwd;
3063 u32 index = ri->ifindex;
3064 int err;
3065
3066 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3067 ri->ifindex = 0;
3068 if (unlikely(!fwd)) {
3069 err = -EINVAL;
3070 goto err;
3071 }
3072
3073 err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
3074 if (unlikely(err))
3075 goto err;
3076
3077 _trace_xdp_redirect(dev, xdp_prog, index);
3078 return 0;
3079err:
3080 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
3081 return err;
3082}
3083
9c270af3
JDB		 3084static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
3085 struct bpf_map *map,
3086 struct xdp_buff *xdp,
3087 u32 index)
3088{
3089 int err;
3090
1b1a251c
BT		 3091 switch (map->map_type) {
3092 case BPF_MAP_TYPE_DEVMAP: {
67f29e07 3093 struct bpf_dtab_netdev *dst = fwd;
9c270af3 3094
38edddb8 3095 err = dev_map_enqueue(dst, xdp, dev_rx);
e1302542 3096 if (unlikely(err))
9c270af3 3097 return err;
11393cc9 3098 __dev_map_insert_ctx(map, index);
1b1a251c
BT		 3099 break;
3100 }
3101 case BPF_MAP_TYPE_CPUMAP: {
9c270af3
JDB		 3102 struct bpf_cpu_map_entry *rcpu = fwd;
3103
3104 err = cpu_map_enqueue(rcpu, xdp, dev_rx);
e1302542 3105 if (unlikely(err))
9c270af3
JDB		 3106 return err;
3107 __cpu_map_insert_ctx(map, index);
1b1a251c
BT		 3108 break;
3109 }
3110 case BPF_MAP_TYPE_XSKMAP: {
3111 struct xdp_sock *xs = fwd;
3112
3113 err = __xsk_map_redirect(map, xdp, xs);
3114 return err;
3115 }
3116 default:
3117 break;
9c270af3 3118 }
e4a8e817 3119 return 0;
814abfab
JF		 3120}
3121
11393cc9
JF		 3122void xdp_do_flush_map(void)
3123{
0b19cc0a 3124 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
11393cc9
JF		 3125 struct bpf_map *map = ri->map_to_flush;
3126
11393cc9 3127 ri->map_to_flush = NULL;
9c270af3
JDB		 3128 if (map) {
3129 switch (map->map_type) {
3130 case BPF_MAP_TYPE_DEVMAP:
3131 __dev_map_flush(map);
3132 break;
3133 case BPF_MAP_TYPE_CPUMAP:
3134 __cpu_map_flush(map);
3135 break;
1b1a251c
BT		 3136 case BPF_MAP_TYPE_XSKMAP:
3137 __xsk_map_flush(map);
3138 break;
9c270af3
JDB		 3139 default:
3140 break;
3141 }
3142 }
11393cc9
JF		 3143}
3144EXPORT_SYMBOL_GPL(xdp_do_flush_map);
3145
2a68d85f 3146static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
9c270af3
JDB		 3147{
3148 switch (map->map_type) {
3149 case BPF_MAP_TYPE_DEVMAP:
3150 return __dev_map_lookup_elem(map, index);
3151 case BPF_MAP_TYPE_CPUMAP:
3152 return __cpu_map_lookup_elem(map, index);
1b1a251c
BT		 3153 case BPF_MAP_TYPE_XSKMAP:
3154 return __xsk_map_lookup_elem(map, index);
9c270af3
JDB		 3155 default:
3156 return NULL;
3157 }
3158}
3159
f6069b9a 3160void bpf_clear_redirect_map(struct bpf_map *map)
7c300131 3161{
f6069b9a
DB		 3162 struct bpf_redirect_info *ri;
3163 int cpu;
3164
3165 for_each_possible_cpu(cpu) {
3166 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
3167 /* Avoid polluting remote cacheline due to writes if
3168 * not needed. Once we pass this test, we need the
3169 * cmpxchg() to make sure it hasn't been changed in
3170 * the meantime by remote CPU.
3171 */
3172 if (unlikely(READ_ONCE(ri->map) == map))
3173 cmpxchg(&ri->map, map, NULL);
3174 }
7c300131
DB		 3175}
3176
e4a8e817 3177static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
47b123ed
JDB		 3178 struct bpf_prog *xdp_prog, struct bpf_map *map,
3179 struct bpf_redirect_info *ri)
97f91a7c 3180{
11393cc9 3181 u32 index = ri->ifindex;
9c270af3 3182 void *fwd = NULL;
4c03bdd7 3183 int err;
97f91a7c
JF		 3184
3185 ri->ifindex = 0;
f6069b9a 3186 WRITE_ONCE(ri->map, NULL);
97f91a7c 3187
9c270af3 3188 fwd = __xdp_map_lookup_elem(map, index);
2a68d85f 3189 if (unlikely(!fwd)) {
4c03bdd7 3190 err = -EINVAL;
f5836ca5 3191 goto err;
4c03bdd7 3192 }
e1302542 3193 if (ri->map_to_flush && unlikely(ri->map_to_flush != map))
11393cc9
JF		 3194 xdp_do_flush_map();
3195
9c270af3 3196 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index);
f5836ca5
JDB		 3197 if (unlikely(err))
3198 goto err;
3199
3200 ri->map_to_flush = map;
59a30896 3201 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
f5836ca5
JDB		 3202 return 0;
3203err:
59a30896 3204 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
97f91a7c
JF		 3205 return err;
3206}
3207
5acaee0a
JF		 3208int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
3209 struct bpf_prog *xdp_prog)
814abfab 3210{
0b19cc0a 3211 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
f6069b9a 3212 struct bpf_map *map = READ_ONCE(ri->map);
814abfab 3213
2a68d85f 3214 if (likely(map))
47b123ed 3215 return xdp_do_redirect_map(dev, xdp, xdp_prog, map, ri);
97f91a7c 3216
47b123ed 3217 return xdp_do_redirect_slow(dev, xdp, xdp_prog, ri);
814abfab
JF		 3218}
3219EXPORT_SYMBOL_GPL(xdp_do_redirect);
3220
c060bc61
XS		 3221static int xdp_do_generic_redirect_map(struct net_device *dev,
3222 struct sk_buff *skb,
02671e23 3223 struct xdp_buff *xdp,
f6069b9a
DB		 3224 struct bpf_prog *xdp_prog,
3225 struct bpf_map *map)
6103aa96 3226{
0b19cc0a 3227 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
eb48d682 3228 u32 index = ri->ifindex;
02671e23 3229 void *fwd = NULL;
2facaad6 3230 int err = 0;
6103aa96 3231
6103aa96 3232 ri->ifindex = 0;
f6069b9a 3233 WRITE_ONCE(ri->map, NULL);
96c5508e 3234
9c270af3 3235 fwd = __xdp_map_lookup_elem(map, index);
2facaad6
JDB		 3236 if (unlikely(!fwd)) {
3237 err = -EINVAL;
f5836ca5 3238 goto err;
6103aa96
JF		 3239 }
3240
9c270af3 3241 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
6d5fc195
TM		 3242 struct bpf_dtab_netdev *dst = fwd;
3243
3244 err = dev_map_generic_redirect(dst, skb, xdp_prog);
3245 if (unlikely(err))
9c270af3 3246 goto err;
02671e23
BT		 3247 } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
3248 struct xdp_sock *xs = fwd;
3249
3250 err = xsk_generic_rcv(xs, xdp);
3251 if (err)
3252 goto err;
3253 consume_skb(skb);
9c270af3
JDB		 3254 } else {
3255 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3256 err = -EBADRQC;
f5836ca5 3257 goto err;
2facaad6 3258 }
6103aa96 3259
9c270af3
JDB		 3260 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3261 return 0;
3262err:
3263 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3264 return err;
3265}
3266
3267int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
02671e23 3268 struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
9c270af3 3269{
0b19cc0a 3270 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
f6069b9a 3271 struct bpf_map *map = READ_ONCE(ri->map);
9c270af3
JDB		 3272 u32 index = ri->ifindex;
3273 struct net_device *fwd;
3274 int err = 0;
3275
f6069b9a
DB		 3276 if (map)
3277 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog,
3278 map);
9c270af3
JDB		 3279 ri->ifindex = 0;
3280 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3281 if (unlikely(!fwd)) {
3282 err = -EINVAL;
f5836ca5 3283 goto err;
2facaad6
JDB		 3284 }
3285
d8d7218a
TM		 3286 err = xdp_ok_fwd_dev(fwd, skb->len);
3287 if (unlikely(err))
9c270af3
JDB		 3288 goto err;
3289
2facaad6 3290 skb->dev = fwd;
9c270af3 3291 _trace_xdp_redirect(dev, xdp_prog, index);
02671e23 3292 generic_xdp_tx(skb, xdp_prog);
f5836ca5
JDB		 3293 return 0;
3294err:
9c270af3 3295 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2facaad6 3296 return err;
6103aa96
JF		 3297}
3298EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
3299
814abfab
JF		 3300BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
3301{
0b19cc0a 3302 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
814abfab
JF		 3303
3304 if (unlikely(flags))
3305 return XDP_ABORTED;
3306
3307 ri->ifindex = ifindex;
3308 ri->flags = flags;
f6069b9a 3309 WRITE_ONCE(ri->map, NULL);
e4a8e817 3310
814abfab
JF		 3311 return XDP_REDIRECT;
3312}
3313
3314static const struct bpf_func_proto bpf_xdp_redirect_proto = {
3315 .func = bpf_xdp_redirect,
3316 .gpl_only = false,
3317 .ret_type = RET_INTEGER,
3318 .arg1_type = ARG_ANYTHING,
3319 .arg2_type = ARG_ANYTHING,
3320};
3321
f6069b9a
DB		 3322BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
3323 u64, flags)
e4a8e817 3324{
0b19cc0a 3325 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
e4a8e817
DB		 3326
3327 if (unlikely(flags))
3328 return XDP_ABORTED;
3329
3330 ri->ifindex = ifindex;
3331 ri->flags = flags;
f6069b9a 3332 WRITE_ONCE(ri->map, map);
e4a8e817
DB		 3333
3334 return XDP_REDIRECT;
3335}
3336
3337static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
3338 .func = bpf_xdp_redirect_map,
3339 .gpl_only = false,
3340 .ret_type = RET_INTEGER,
3341 .arg1_type = ARG_CONST_MAP_PTR,
3342 .arg2_type = ARG_ANYTHING,
3343 .arg3_type = ARG_ANYTHING,
3344};
3345
555c8a86 3346static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
aa7145c1 3347 unsigned long off, unsigned long len)
555c8a86 3348{
aa7145c1 3349 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
555c8a86
DB		 3350
3351 if (unlikely(!ptr))
3352 return len;
3353 if (ptr != dst_buff)
3354 memcpy(dst_buff, ptr, len);
3355
3356 return 0;
3357}
3358
f3694e00
DB		 3359BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
3360 u64, flags, void *, meta, u64, meta_size)
555c8a86 3361{
555c8a86 3362 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
555c8a86
DB		 3363
3364 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3365 return -EINVAL;
3366 if (unlikely(skb_size > skb->len))
3367 return -EFAULT;
3368
3369 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
3370 bpf_skb_copy);
3371}
3372
3373static const struct bpf_func_proto bpf_skb_event_output_proto = {
3374 .func = bpf_skb_event_output,
3375 .gpl_only = true,
3376 .ret_type = RET_INTEGER,
3377 .arg1_type = ARG_PTR_TO_CTX,
3378 .arg2_type = ARG_CONST_MAP_PTR,
3379 .arg3_type = ARG_ANYTHING,
39f19ebb 3380 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 3381 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
555c8a86
DB		 3382};
3383
c6c33454
DB		 3384static unsigned short bpf_tunnel_key_af(u64 flags)
3385{
3386 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
3387}
3388
f3694e00
DB		 3389BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
3390 u32, size, u64, flags)
d3aa45ce 3391{
c6c33454
DB		 3392 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
3393 u8 compat[sizeof(struct bpf_tunnel_key)];
074f528e
DB		 3394 void *to_orig = to;
3395 int err;
d3aa45ce 3396
074f528e
DB		 3397 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
3398 err = -EINVAL;
3399 goto err_clear;
3400 }
3401 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
3402 err = -EPROTO;
3403 goto err_clear;
3404 }
c6c33454 3405 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
074f528e 3406 err = -EINVAL;
c6c33454 3407 switch (size) {
4018ab18 3408 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 3409 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4018ab18 3410 goto set_compat;
c6c33454
DB		 3411 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3412 /* Fixup deprecated structure layouts here, so we have
3413 * a common path later on.
3414 */
3415 if (ip_tunnel_info_af(info) != AF_INET)
074f528e 3416 goto err_clear;
4018ab18 3417set_compat:
c6c33454
DB		 3418 to = (struct bpf_tunnel_key *)compat;
3419 break;
3420 default:
074f528e 3421 goto err_clear;
c6c33454
DB		 3422 }
3423 }
d3aa45ce
AS		 3424
3425 to->tunnel_id = be64_to_cpu(info->key.tun_id);
c6c33454
DB		 3426 to->tunnel_tos = info->key.tos;
3427 to->tunnel_ttl = info->key.ttl;
1fbc2e0c 3428 to->tunnel_ext = 0;
c6c33454 3429
4018ab18 3430 if (flags & BPF_F_TUNINFO_IPV6) {
c6c33454
DB		 3431 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
3432 sizeof(to->remote_ipv6));
4018ab18
DB		 3433 to->tunnel_label = be32_to_cpu(info->key.label);
3434 } else {
c6c33454 3435 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
1fbc2e0c
DB		 3436 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
3437 to->tunnel_label = 0;
4018ab18 3438 }
c6c33454
DB		 3439
3440 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
074f528e 3441 memcpy(to_orig, to, size);
d3aa45ce
AS		 3442
3443 return 0;
074f528e
DB		 3444err_clear:
3445 memset(to_orig, 0, size);
3446 return err;
d3aa45ce
AS		 3447}
3448
577c50aa 3449static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
d3aa45ce
AS		 3450 .func = bpf_skb_get_tunnel_key,
3451 .gpl_only = false,
3452 .ret_type = RET_INTEGER,
3453 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3454 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
3455 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 3456 .arg4_type = ARG_ANYTHING,
3457};
3458
f3694e00 3459BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
14ca0751 3460{
14ca0751 3461 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
074f528e 3462 int err;
14ca0751
DB		 3463
3464 if (unlikely(!info ||
074f528e
DB		 3465 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
3466 err = -ENOENT;
3467 goto err_clear;
3468 }
3469 if (unlikely(size < info->options_len)) {
3470 err = -ENOMEM;
3471 goto err_clear;
3472 }
14ca0751
DB		 3473
3474 ip_tunnel_info_opts_get(to, info);
074f528e
DB		 3475 if (size > info->options_len)
3476 memset(to + info->options_len, 0, size - info->options_len);
14ca0751
DB		 3477
3478 return info->options_len;
074f528e
DB		 3479err_clear:
3480 memset(to, 0, size);
3481 return err;
14ca0751
DB		 3482}
3483
3484static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
3485 .func = bpf_skb_get_tunnel_opt,
3486 .gpl_only = false,
3487 .ret_type = RET_INTEGER,
3488 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3489 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
3490 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 3491};
3492
d3aa45ce
AS		 3493static struct metadata_dst __percpu *md_dst;
3494
f3694e00
DB		 3495BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
3496 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
d3aa45ce 3497{
d3aa45ce 3498 struct metadata_dst *md = this_cpu_ptr(md_dst);
c6c33454 3499 u8 compat[sizeof(struct bpf_tunnel_key)];
d3aa45ce
AS		 3500 struct ip_tunnel_info *info;
3501
22080870 3502 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
77a5196a 3503 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
d3aa45ce 3504 return -EINVAL;
c6c33454
DB		 3505 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
3506 switch (size) {
4018ab18 3507 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 3508 case offsetof(struct bpf_tunnel_key, tunnel_ext):
c6c33454
DB		 3509 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3510 /* Fixup deprecated structure layouts here, so we have
3511 * a common path later on.
3512 */
3513 memcpy(compat, from, size);
3514 memset(compat + size, 0, sizeof(compat) - size);
f3694e00 3515 from = (const struct bpf_tunnel_key *) compat;
c6c33454
DB		 3516 break;
3517 default:
3518 return -EINVAL;
3519 }
3520 }
c0e760c9
DB		 3521 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3522 from->tunnel_ext))
4018ab18 3523 return -EINVAL;
d3aa45ce
AS		 3524
3525 skb_dst_drop(skb);
3526 dst_hold((struct dst_entry *) md);
3527 skb_dst_set(skb, (struct dst_entry *) md);
3528
3529 info = &md->u.tun_info;
5540fbf4 3530 memset(info, 0, sizeof(*info));
d3aa45ce 3531 info->mode = IP_TUNNEL_INFO_TX;
c6c33454 3532
db3c6139 3533 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
22080870
DB		 3534 if (flags & BPF_F_DONT_FRAGMENT)
3535 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
792f3dd6
WT		 3536 if (flags & BPF_F_ZERO_CSUM_TX)
3537 info->key.tun_flags &= ~TUNNEL_CSUM;
77a5196a
WT		 3538 if (flags & BPF_F_SEQ_NUMBER)
3539 info->key.tun_flags |= TUNNEL_SEQ;
22080870 3540
d3aa45ce 3541 info->key.tun_id = cpu_to_be64(from->tunnel_id);
c6c33454
DB		 3542 info->key.tos = from->tunnel_tos;
3543 info->key.ttl = from->tunnel_ttl;
3544
3545 if (flags & BPF_F_TUNINFO_IPV6) {
3546 info->mode |= IP_TUNNEL_INFO_IPV6;
3547 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3548 sizeof(from->remote_ipv6));
4018ab18
DB		 3549 info->key.label = cpu_to_be32(from->tunnel_label) &
3550 IPV6_FLOWLABEL_MASK;
c6c33454
DB		 3551 } else {
3552 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3553 }
d3aa45ce
AS		 3554
3555 return 0;
3556}
3557
577c50aa 3558static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
d3aa45ce
AS		 3559 .func = bpf_skb_set_tunnel_key,
3560 .gpl_only = false,
3561 .ret_type = RET_INTEGER,
3562 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3563 .arg2_type = ARG_PTR_TO_MEM,
3564 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 3565 .arg4_type = ARG_ANYTHING,
3566};
3567
f3694e00
DB		 3568BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3569 const u8 *, from, u32, size)
14ca0751 3570{
14ca0751
DB		 3571 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3572 const struct metadata_dst *md = this_cpu_ptr(md_dst);
3573
3574 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3575 return -EINVAL;
fca5fdf6 3576 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
14ca0751
DB		 3577 return -ENOMEM;
3578
256c87c1 3579 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
14ca0751
DB		 3580
3581 return 0;
3582}
3583
3584static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3585 .func = bpf_skb_set_tunnel_opt,
3586 .gpl_only = false,
3587 .ret_type = RET_INTEGER,
3588 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3589 .arg2_type = ARG_PTR_TO_MEM,
3590 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 3591};
3592
3593static const struct bpf_func_proto *
3594bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
d3aa45ce
AS		 3595{
3596 if (!md_dst) {
d66f2b91
JK		 3597 struct metadata_dst __percpu *tmp;
3598
3599 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3600 METADATA_IP_TUNNEL,
3601 GFP_KERNEL);
3602 if (!tmp)
d3aa45ce 3603 return NULL;
d66f2b91
JK		 3604 if (cmpxchg(&md_dst, NULL, tmp))
3605 metadata_dst_free_percpu(tmp);
d3aa45ce 3606 }
14ca0751
DB		 3607
3608 switch (which) {
3609 case BPF_FUNC_skb_set_tunnel_key:
3610 return &bpf_skb_set_tunnel_key_proto;
3611 case BPF_FUNC_skb_set_tunnel_opt:
3612 return &bpf_skb_set_tunnel_opt_proto;
3613 default:
3614 return NULL;
3615 }
d3aa45ce
AS		 3616}
3617
f3694e00
DB		 3618BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3619 u32, idx)
4a482f34 3620{
4a482f34
MKL		 3621 struct bpf_array *array = container_of(map, struct bpf_array, map);
3622 struct cgroup *cgrp;
3623 struct sock *sk;
4a482f34 3624
2d48c5f9 3625 sk = skb_to_full_sk(skb);
4a482f34
MKL		 3626 if (!sk || !sk_fullsock(sk))
3627 return -ENOENT;
f3694e00 3628 if (unlikely(idx >= array->map.max_entries))
4a482f34
MKL		 3629 return -E2BIG;
3630
f3694e00 3631 cgrp = READ_ONCE(array->ptrs[idx]);
4a482f34
MKL		 3632 if (unlikely(!cgrp))
3633 return -EAGAIN;
3634
54fd9c2d 3635 return sk_under_cgroup_hierarchy(sk, cgrp);
4a482f34
MKL		 3636}
3637
747ea55e
DB		 3638static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3639 .func = bpf_skb_under_cgroup,
4a482f34
MKL		 3640 .gpl_only = false,
3641 .ret_type = RET_INTEGER,
3642 .arg1_type = ARG_PTR_TO_CTX,
3643 .arg2_type = ARG_CONST_MAP_PTR,
3644 .arg3_type = ARG_ANYTHING,
3645};
4a482f34 3646
cb20b08e
DB		 3647#ifdef CONFIG_SOCK_CGROUP_DATA
3648BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
3649{
3650 struct sock *sk = skb_to_full_sk(skb);
3651 struct cgroup *cgrp;
3652
3653 if (!sk || !sk_fullsock(sk))
3654 return 0;
3655
3656 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
3657 return cgrp->kn->id.id;
3658}
3659
3660static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
3661 .func = bpf_skb_cgroup_id,
3662 .gpl_only = false,
3663 .ret_type = RET_INTEGER,
3664 .arg1_type = ARG_PTR_TO_CTX,
3665};
77236281
AI		 3666
3667BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
3668 ancestor_level)
3669{
3670 struct sock *sk = skb_to_full_sk(skb);
3671 struct cgroup *ancestor;
3672 struct cgroup *cgrp;
3673
3674 if (!sk || !sk_fullsock(sk))
3675 return 0;
3676
3677 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
3678 ancestor = cgroup_ancestor(cgrp, ancestor_level);
3679 if (!ancestor)
3680 return 0;
3681
3682 return ancestor->kn->id.id;
3683}
3684
3685static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
3686 .func = bpf_skb_ancestor_cgroup_id,
3687 .gpl_only = false,
3688 .ret_type = RET_INTEGER,
3689 .arg1_type = ARG_PTR_TO_CTX,
3690 .arg2_type = ARG_ANYTHING,
3691};
cb20b08e
DB		 3692#endif
3693
4de16969
DB		 3694static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
3695 unsigned long off, unsigned long len)
3696{
3697 memcpy(dst_buff, src_buff + off, len);
3698 return 0;
3699}
3700
f3694e00
DB		 3701BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
3702 u64, flags, void *, meta, u64, meta_size)
4de16969 3703{
4de16969 3704 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4de16969
DB		 3705
3706 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3707 return -EINVAL;
3708 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
3709 return -EFAULT;
3710
9c471370
MKL		 3711 return bpf_event_output(map, flags, meta, meta_size, xdp->data,
3712 xdp_size, bpf_xdp_copy);
4de16969
DB		 3713}
3714
3715static const struct bpf_func_proto bpf_xdp_event_output_proto = {
3716 .func = bpf_xdp_event_output,
3717 .gpl_only = true,
3718 .ret_type = RET_INTEGER,
3719 .arg1_type = ARG_PTR_TO_CTX,
3720 .arg2_type = ARG_CONST_MAP_PTR,
3721 .arg3_type = ARG_ANYTHING,
39f19ebb 3722 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 3723 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4de16969
DB		 3724};
3725
91b8270f
CF		 3726BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
3727{
3728 return skb->sk ? sock_gen_cookie(skb->sk) : 0;
3729}
3730
3731static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
3732 .func = bpf_get_socket_cookie,
3733 .gpl_only = false,
3734 .ret_type = RET_INTEGER,
3735 .arg1_type = ARG_PTR_TO_CTX,
3736};
3737
d692f113
AI		 3738BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
3739{
3740 return sock_gen_cookie(ctx->sk);
3741}
3742
3743static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
3744 .func = bpf_get_socket_cookie_sock_addr,
3745 .gpl_only = false,
3746 .ret_type = RET_INTEGER,
3747 .arg1_type = ARG_PTR_TO_CTX,
3748};
3749
3750BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
3751{
3752 return sock_gen_cookie(ctx->sk);
3753}
3754
3755static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
3756 .func = bpf_get_socket_cookie_sock_ops,
3757 .gpl_only = false,
3758 .ret_type = RET_INTEGER,
3759 .arg1_type = ARG_PTR_TO_CTX,
3760};
3761
6acc5c29
CF		 3762BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
3763{
3764 struct sock *sk = sk_to_full_sk(skb->sk);
3765 kuid_t kuid;
3766
3767 if (!sk || !sk_fullsock(sk))
3768 return overflowuid;
3769 kuid = sock_net_uid(sock_net(sk), sk);
3770 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
3771}
3772
3773static const struct bpf_func_proto bpf_get_socket_uid_proto = {
3774 .func = bpf_get_socket_uid,
3775 .gpl_only = false,
3776 .ret_type = RET_INTEGER,
3777 .arg1_type = ARG_PTR_TO_CTX,
3778};
3779
8c4b4c7e
LB		 3780BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3781 int, level, int, optname, char *, optval, int, optlen)
3782{
3783 struct sock *sk = bpf_sock->sk;
3784 int ret = 0;
3785 int val;
3786
3787 if (!sk_fullsock(sk))
3788 return -EINVAL;
3789
3790 if (level == SOL_SOCKET) {
3791 if (optlen != sizeof(int))
3792 return -EINVAL;
3793 val = *((int *)optval);
3794
3795 /* Only some socketops are supported */
3796 switch (optname) {
3797 case SO_RCVBUF:
3798 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
3799 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
3800 break;
3801 case SO_SNDBUF:
3802 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
3803 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
3804 break;
3805 case SO_MAX_PACING_RATE:
3806 sk->sk_max_pacing_rate = val;
3807 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
3808 sk->sk_max_pacing_rate);
3809 break;
3810 case SO_PRIORITY:
3811 sk->sk_priority = val;
3812 break;
3813 case SO_RCVLOWAT:
3814 if (val < 0)
3815 val = INT_MAX;
3816 sk->sk_rcvlowat = val ? : 1;
3817 break;
3818 case SO_MARK:
3819 sk->sk_mark = val;
3820 break;
3821 default:
3822 ret = -EINVAL;
3823 }
a5192c52 3824#ifdef CONFIG_INET
6f5c39fa
NS		 3825 } else if (level == SOL_IP) {
3826 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
3827 return -EINVAL;
3828
3829 val = *((int *)optval);
3830 /* Only some options are supported */
3831 switch (optname) {
3832 case IP_TOS:
3833 if (val < -1 || val > 0xff) {
3834 ret = -EINVAL;
3835 } else {
3836 struct inet_sock *inet = inet_sk(sk);
3837
3838 if (val == -1)
3839 val = 0;
3840 inet->tos = val;
3841 }
3842 break;
3843 default:
3844 ret = -EINVAL;
3845 }
6f9bd3d7
LB		 3846#if IS_ENABLED(CONFIG_IPV6)
3847 } else if (level == SOL_IPV6) {
3848 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
3849 return -EINVAL;
3850
3851 val = *((int *)optval);
3852 /* Only some options are supported */
3853 switch (optname) {
3854 case IPV6_TCLASS:
3855 if (val < -1 || val > 0xff) {
3856 ret = -EINVAL;
3857 } else {
3858 struct ipv6_pinfo *np = inet6_sk(sk);
3859
3860 if (val == -1)
3861 val = 0;
3862 np->tclass = val;
3863 }
3864 break;
3865 default:
3866 ret = -EINVAL;
3867 }
3868#endif
8c4b4c7e
LB		 3869 } else if (level == SOL_TCP &&
3870 sk->sk_prot->setsockopt == tcp_setsockopt) {
91b5b21c
LB		 3871 if (optname == TCP_CONGESTION) {
3872 char name[TCP_CA_NAME_MAX];
ebfa00c5 3873 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
91b5b21c
LB		 3874
3875 strncpy(name, optval, min_t(long, optlen,
3876 TCP_CA_NAME_MAX-1));
3877 name[TCP_CA_NAME_MAX-1] = 0;
6f9bd3d7
LB		 3878 ret = tcp_set_congestion_control(sk, name, false,
3879 reinit);
91b5b21c 3880 } else {
fc747810
LB		 3881 struct tcp_sock *tp = tcp_sk(sk);
3882
3883 if (optlen != sizeof(int))
3884 return -EINVAL;
3885
3886 val = *((int *)optval);
3887 /* Only some options are supported */
3888 switch (optname) {
3889 case TCP_BPF_IW:
3890 if (val <= 0 || tp->data_segs_out > 0)
3891 ret = -EINVAL;
3892 else
3893 tp->snd_cwnd = val;
3894 break;
13bf9641
LB		 3895 case TCP_BPF_SNDCWND_CLAMP:
3896 if (val <= 0) {
3897 ret = -EINVAL;
3898 } else {
3899 tp->snd_cwnd_clamp = val;
3900 tp->snd_ssthresh = val;
3901 }
6d3f06a0 3902 break;
1e215300
NS		 3903 case TCP_SAVE_SYN:
3904 if (val < 0 || val > 1)
3905 ret = -EINVAL;
3906 else
3907 tp->save_syn = val;
3908 break;
fc747810
LB		 3909 default:
3910 ret = -EINVAL;
3911 }
91b5b21c 3912 }
91b5b21c 3913#endif
8c4b4c7e
LB		 3914 } else {
3915 ret = -EINVAL;
3916 }
3917 return ret;
3918}
3919
3920static const struct bpf_func_proto bpf_setsockopt_proto = {
3921 .func = bpf_setsockopt,
cd86d1fd 3922 .gpl_only = false,
8c4b4c7e
LB		 3923 .ret_type = RET_INTEGER,
3924 .arg1_type = ARG_PTR_TO_CTX,
3925 .arg2_type = ARG_ANYTHING,
3926 .arg3_type = ARG_ANYTHING,
3927 .arg4_type = ARG_PTR_TO_MEM,
3928 .arg5_type = ARG_CONST_SIZE,
3929};
3930
cd86d1fd
LB		 3931BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3932 int, level, int, optname, char *, optval, int, optlen)
3933{
3934 struct sock *sk = bpf_sock->sk;
cd86d1fd
LB		 3935
3936 if (!sk_fullsock(sk))
3937 goto err_clear;
cd86d1fd
LB		 3938#ifdef CONFIG_INET
3939 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
1edb6e03
AR		 3940 struct inet_connection_sock *icsk;
3941 struct tcp_sock *tp;
3942
1e215300
NS		 3943 switch (optname) {
3944 case TCP_CONGESTION:
3945 icsk = inet_csk(sk);
cd86d1fd
LB		 3946
3947 if (!icsk->icsk_ca_ops || optlen <= 1)
3948 goto err_clear;
3949 strncpy(optval, icsk->icsk_ca_ops->name, optlen);
3950 optval[optlen - 1] = 0;
1e215300
NS		 3951 break;
3952 case TCP_SAVED_SYN:
3953 tp = tcp_sk(sk);
3954
3955 if (optlen <= 0 || !tp->saved_syn ||
3956 optlen > tp->saved_syn[0])
3957 goto err_clear;
3958 memcpy(optval, tp->saved_syn + 1, optlen);
3959 break;
3960 default:
cd86d1fd
LB		 3961 goto err_clear;
3962 }
6f5c39fa
NS		 3963 } else if (level == SOL_IP) {
3964 struct inet_sock *inet = inet_sk(sk);
3965
3966 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
3967 goto err_clear;
3968
3969 /* Only some options are supported */
3970 switch (optname) {
3971 case IP_TOS:
3972 *((int *)optval) = (int)inet->tos;
3973 break;
3974 default:
3975 goto err_clear;
3976 }
6f9bd3d7
LB		 3977#if IS_ENABLED(CONFIG_IPV6)
3978 } else if (level == SOL_IPV6) {
3979 struct ipv6_pinfo *np = inet6_sk(sk);
3980
3981 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
3982 goto err_clear;
3983
3984 /* Only some options are supported */
3985 switch (optname) {
3986 case IPV6_TCLASS:
3987 *((int *)optval) = (int)np->tclass;
3988 break;
3989 default:
3990 goto err_clear;
3991 }
3992#endif
cd86d1fd
LB		 3993 } else {
3994 goto err_clear;
3995 }
aa2bc739 3996 return 0;
cd86d1fd
LB		 3997#endif
3998err_clear:
3999 memset(optval, 0, optlen);
4000 return -EINVAL;
4001}
4002
4003static const struct bpf_func_proto bpf_getsockopt_proto = {
4004 .func = bpf_getsockopt,
4005 .gpl_only = false,
4006 .ret_type = RET_INTEGER,
4007 .arg1_type = ARG_PTR_TO_CTX,
4008 .arg2_type = ARG_ANYTHING,
4009 .arg3_type = ARG_ANYTHING,
4010 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
4011 .arg5_type = ARG_CONST_SIZE,
4012};
4013
b13d8807
LB		 4014BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
4015 int, argval)
4016{
4017 struct sock *sk = bpf_sock->sk;
4018 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
4019
a7dcdf6e 4020 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
b13d8807
LB		 4021 return -EINVAL;
4022
b13d8807
LB		 4023 if (val)
4024 tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
4025
4026 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
b13d8807
LB		 4027}
4028
4029static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
4030 .func = bpf_sock_ops_cb_flags_set,
4031 .gpl_only = false,
4032 .ret_type = RET_INTEGER,
4033 .arg1_type = ARG_PTR_TO_CTX,
4034 .arg2_type = ARG_ANYTHING,
4035};
4036
d74bad4e
AI		 4037const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
4038EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
4039
4040BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
4041 int, addr_len)
4042{
4043#ifdef CONFIG_INET
4044 struct sock *sk = ctx->sk;
4045 int err;
4046
4047 /* Binding to port can be expensive so it's prohibited in the helper.
4048 * Only binding to IP is supported.
4049 */
4050 err = -EINVAL;
4051 if (addr->sa_family == AF_INET) {
4052 if (addr_len < sizeof(struct sockaddr_in))
4053 return err;
4054 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
4055 return err;
4056 return __inet_bind(sk, addr, addr_len, true, false);
4057#if IS_ENABLED(CONFIG_IPV6)
4058 } else if (addr->sa_family == AF_INET6) {
4059 if (addr_len < SIN6_LEN_RFC2133)
4060 return err;
4061 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
4062 return err;
4063 /* ipv6_bpf_stub cannot be NULL, since it's called from
4064 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
4065 */
4066 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false);
4067#endif /* CONFIG_IPV6 */
4068 }
4069#endif /* CONFIG_INET */
4070
4071 return -EAFNOSUPPORT;
4072}
4073
4074static const struct bpf_func_proto bpf_bind_proto = {
4075 .func = bpf_bind,
4076 .gpl_only = false,
4077 .ret_type = RET_INTEGER,
4078 .arg1_type = ARG_PTR_TO_CTX,
4079 .arg2_type = ARG_PTR_TO_MEM,
4080 .arg3_type = ARG_CONST_SIZE,
4081};
4082
12bed760
EB		 4083#ifdef CONFIG_XFRM
4084BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
4085 struct bpf_xfrm_state *, to, u32, size, u64, flags)
4086{
4087 const struct sec_path *sp = skb_sec_path(skb);
4088 const struct xfrm_state *x;
4089
4090 if (!sp || unlikely(index >= sp->len || flags))
4091 goto err_clear;
4092
4093 x = sp->xvec[index];
4094
4095 if (unlikely(size != sizeof(struct bpf_xfrm_state)))
4096 goto err_clear;
4097
4098 to->reqid = x->props.reqid;
4099 to->spi = x->id.spi;
4100 to->family = x->props.family;
1fbc2e0c
DB		 4101 to->ext = 0;
4102
12bed760
EB		 4103 if (to->family == AF_INET6) {
4104 memcpy(to->remote_ipv6, x->props.saddr.a6,
4105 sizeof(to->remote_ipv6));
4106 } else {
4107 to->remote_ipv4 = x->props.saddr.a4;
1fbc2e0c 4108 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
12bed760
EB		 4109 }
4110
4111 return 0;
4112err_clear:
4113 memset(to, 0, size);
4114 return -EINVAL;
4115}
4116
4117static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
4118 .func = bpf_skb_get_xfrm_state,
4119 .gpl_only = false,
4120 .ret_type = RET_INTEGER,
4121 .arg1_type = ARG_PTR_TO_CTX,
4122 .arg2_type = ARG_ANYTHING,
4123 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
4124 .arg4_type = ARG_CONST_SIZE,
4125 .arg5_type = ARG_ANYTHING,
4126};
4127#endif
4128
87f5fc7e
DA		 4129#if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
4130static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
4131 const struct neighbour *neigh,
4132 const struct net_device *dev)
4133{
4134 memcpy(params->dmac, neigh->ha, ETH_ALEN);
4135 memcpy(params->smac, dev->dev_addr, ETH_ALEN);
4136 params->h_vlan_TCI = 0;
4137 params->h_vlan_proto = 0;
4c79579b 4138 params->ifindex = dev->ifindex;
87f5fc7e 4139
4c79579b 4140 return 0;
87f5fc7e
DA		 4141}
4142#endif
4143
4144#if IS_ENABLED(CONFIG_INET)
4145static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4f74fede 4146 u32 flags, bool check_mtu)
87f5fc7e
DA		 4147{
4148 struct in_device *in_dev;
4149 struct neighbour *neigh;
4150 struct net_device *dev;
4151 struct fib_result res;
4152 struct fib_nh *nh;
4153 struct flowi4 fl4;
4154 int err;
4f74fede 4155 u32 mtu;
87f5fc7e
DA		 4156
4157 dev = dev_get_by_index_rcu(net, params->ifindex);
4158 if (unlikely(!dev))
4159 return -ENODEV;
4160
4161 /* verify forwarding is enabled on this interface */
4162 in_dev = __in_dev_get_rcu(dev);
4163 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
4c79579b 4164 return BPF_FIB_LKUP_RET_FWD_DISABLED;
87f5fc7e
DA		 4165
4166 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4167 fl4.flowi4_iif = 1;
4168 fl4.flowi4_oif = params->ifindex;
4169 } else {
4170 fl4.flowi4_iif = params->ifindex;
4171 fl4.flowi4_oif = 0;
4172 }
4173 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
4174 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
4175 fl4.flowi4_flags = 0;
4176
4177 fl4.flowi4_proto = params->l4_protocol;
4178 fl4.daddr = params->ipv4_dst;
4179 fl4.saddr = params->ipv4_src;
4180 fl4.fl4_sport = params->sport;
4181 fl4.fl4_dport = params->dport;
4182
4183 if (flags & BPF_FIB_LOOKUP_DIRECT) {
4184 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4185 struct fib_table *tb;
4186
4187 tb = fib_get_table(net, tbid);
4188 if (unlikely(!tb))
4c79579b 4189 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4190
4191 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
4192 } else {
4193 fl4.flowi4_mark = 0;
4194 fl4.flowi4_secid = 0;
4195 fl4.flowi4_tun_key.tun_id = 0;
4196 fl4.flowi4_uid = sock_net_uid(net, NULL);
4197
4198 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
4199 }
4200
4c79579b
DA		 4201 if (err) {
4202 /* map fib lookup errors to RTN_ type */
4203 if (err == -EINVAL)
4204 return BPF_FIB_LKUP_RET_BLACKHOLE;
4205 if (err == -EHOSTUNREACH)
4206 return BPF_FIB_LKUP_RET_UNREACHABLE;
4207 if (err == -EACCES)
4208 return BPF_FIB_LKUP_RET_PROHIBIT;
4209
4210 return BPF_FIB_LKUP_RET_NOT_FWDED;
4211 }
4212
4213 if (res.type != RTN_UNICAST)
4214 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4215
4216 if (res.fi->fib_nhs > 1)
4217 fib_select_path(net, &res, &fl4, NULL);
4218
4f74fede
DA		 4219 if (check_mtu) {
4220 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
4221 if (params->tot_len > mtu)
4c79579b 4222 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4223 }
4224
87f5fc7e
DA		 4225 nh = &res.fi->fib_nh[res.nh_sel];
4226
4227 /* do not handle lwt encaps right now */
4228 if (nh->nh_lwtstate)
4c79579b 4229 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
87f5fc7e
DA		 4230
4231 dev = nh->nh_dev;
87f5fc7e
DA		 4232 if (nh->nh_gw)
4233 params->ipv4_dst = nh->nh_gw;
4234
4235 params->rt_metric = res.fi->fib_priority;
4236
4237 /* xdp and cls_bpf programs are run in RCU-bh so
4238 * rcu_read_lock_bh is not needed here
4239 */
4240 neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)params->ipv4_dst);
4c79579b
DA		 4241 if (!neigh)
4242 return BPF_FIB_LKUP_RET_NO_NEIGH;
87f5fc7e 4243
4c79579b 4244 return bpf_fib_set_fwd_params(params, neigh, dev);
87f5fc7e
DA		 4245}
4246#endif
4247
4248#if IS_ENABLED(CONFIG_IPV6)
4249static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4f74fede 4250 u32 flags, bool check_mtu)
87f5fc7e
DA		 4251{
4252 struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
4253 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
4254 struct neighbour *neigh;
4255 struct net_device *dev;
4256 struct inet6_dev *idev;
4257 struct fib6_info *f6i;
4258 struct flowi6 fl6;
4259 int strict = 0;
4260 int oif;
4f74fede 4261 u32 mtu;
87f5fc7e
DA		 4262
4263 /* link local addresses are never forwarded */
4264 if (rt6_need_strict(dst) || rt6_need_strict(src))
4c79579b 4265 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4266
4267 dev = dev_get_by_index_rcu(net, params->ifindex);
4268 if (unlikely(!dev))
4269 return -ENODEV;
4270
4271 idev = __in6_dev_get_safely(dev);
4272 if (unlikely(!idev || !net->ipv6.devconf_all->forwarding))
4c79579b 4273 return BPF_FIB_LKUP_RET_FWD_DISABLED;
87f5fc7e
DA		 4274
4275 if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4276 fl6.flowi6_iif = 1;
4277 oif = fl6.flowi6_oif = params->ifindex;
4278 } else {
4279 oif = fl6.flowi6_iif = params->ifindex;
4280 fl6.flowi6_oif = 0;
4281 strict = RT6_LOOKUP_F_HAS_SADDR;
4282 }
bd3a08aa 4283 fl6.flowlabel = params->flowinfo;
87f5fc7e
DA		 4284 fl6.flowi6_scope = 0;
4285 fl6.flowi6_flags = 0;
4286 fl6.mp_hash = 0;
4287
4288 fl6.flowi6_proto = params->l4_protocol;
4289 fl6.daddr = *dst;
4290 fl6.saddr = *src;
4291 fl6.fl6_sport = params->sport;
4292 fl6.fl6_dport = params->dport;
4293
4294 if (flags & BPF_FIB_LOOKUP_DIRECT) {
4295 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4296 struct fib6_table *tb;
4297
4298 tb = ipv6_stub->fib6_get_table(net, tbid);
4299 if (unlikely(!tb))
4c79579b 4300 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4301
4302 f6i = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, strict);
4303 } else {
4304 fl6.flowi6_mark = 0;
4305 fl6.flowi6_secid = 0;
4306 fl6.flowi6_tun_key.tun_id = 0;
4307 fl6.flowi6_uid = sock_net_uid(net, NULL);
4308
4309 f6i = ipv6_stub->fib6_lookup(net, oif, &fl6, strict);
4310 }
4311
4312 if (unlikely(IS_ERR_OR_NULL(f6i) || f6i == net->ipv6.fib6_null_entry))
4c79579b
DA		 4313 return BPF_FIB_LKUP_RET_NOT_FWDED;
4314
4315 if (unlikely(f6i->fib6_flags & RTF_REJECT)) {
4316 switch (f6i->fib6_type) {
4317 case RTN_BLACKHOLE:
4318 return BPF_FIB_LKUP_RET_BLACKHOLE;
4319 case RTN_UNREACHABLE:
4320 return BPF_FIB_LKUP_RET_UNREACHABLE;
4321 case RTN_PROHIBIT:
4322 return BPF_FIB_LKUP_RET_PROHIBIT;
4323 default:
4324 return BPF_FIB_LKUP_RET_NOT_FWDED;
4325 }
4326 }
87f5fc7e 4327
4c79579b
DA		 4328 if (f6i->fib6_type != RTN_UNICAST)
4329 return BPF_FIB_LKUP_RET_NOT_FWDED;
87f5fc7e
DA		 4330
4331 if (f6i->fib6_nsiblings && fl6.flowi6_oif == 0)
4332 f6i = ipv6_stub->fib6_multipath_select(net, f6i, &fl6,
4333 fl6.flowi6_oif, NULL,
4334 strict);
4335
4f74fede
DA		 4336 if (check_mtu) {
4337 mtu = ipv6_stub->ip6_mtu_from_fib6(f6i, dst, src);
4338 if (params->tot_len > mtu)
4c79579b 4339 return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4340 }
4341
87f5fc7e 4342 if (f6i->fib6_nh.nh_lwtstate)
4c79579b 4343 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
87f5fc7e
DA		 4344
4345 if (f6i->fib6_flags & RTF_GATEWAY)
4346 *dst = f6i->fib6_nh.nh_gw;
4347
4348 dev = f6i->fib6_nh.nh_dev;
4349 params->rt_metric = f6i->fib6_metric;
4350
4351 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
4352 * not needed here. Can not use __ipv6_neigh_lookup_noref here
4353 * because we need to get nd_tbl via the stub
4354 */
4355 neigh = ___neigh_lookup_noref(ipv6_stub->nd_tbl, neigh_key_eq128,
4356 ndisc_hashfn, dst, dev);
4c79579b
DA		 4357 if (!neigh)
4358 return BPF_FIB_LKUP_RET_NO_NEIGH;
87f5fc7e 4359
4c79579b 4360 return bpf_fib_set_fwd_params(params, neigh, dev);
87f5fc7e
DA		 4361}
4362#endif
4363
4364BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
4365 struct bpf_fib_lookup *, params, int, plen, u32, flags)
4366{
4367 if (plen < sizeof(*params))
4368 return -EINVAL;
4369
9ce64f19
DA		 4370 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4371 return -EINVAL;
4372
87f5fc7e
DA		 4373 switch (params->family) {
4374#if IS_ENABLED(CONFIG_INET)
4375 case AF_INET:
4376 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
4f74fede 4377 flags, true);
87f5fc7e
DA		 4378#endif
4379#if IS_ENABLED(CONFIG_IPV6)
4380 case AF_INET6:
4381 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
4f74fede 4382 flags, true);
87f5fc7e
DA		 4383#endif
4384 }
bcece5dc 4385 return -EAFNOSUPPORT;
87f5fc7e
DA		 4386}
4387
4388static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
4389 .func = bpf_xdp_fib_lookup,
4390 .gpl_only = true,
4391 .ret_type = RET_INTEGER,
4392 .arg1_type = ARG_PTR_TO_CTX,
4393 .arg2_type = ARG_PTR_TO_MEM,
4394 .arg3_type = ARG_CONST_SIZE,
4395 .arg4_type = ARG_ANYTHING,
4396};
4397
4398BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
4399 struct bpf_fib_lookup *, params, int, plen, u32, flags)
4400{
4f74fede 4401 struct net *net = dev_net(skb->dev);
4c79579b 4402 int rc = -EAFNOSUPPORT;
4f74fede 4403
87f5fc7e
DA		 4404 if (plen < sizeof(*params))
4405 return -EINVAL;
4406
9ce64f19
DA		 4407 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4408 return -EINVAL;
4409
87f5fc7e
DA		 4410 switch (params->family) {
4411#if IS_ENABLED(CONFIG_INET)
4412 case AF_INET:
4c79579b 4413 rc = bpf_ipv4_fib_lookup(net, params, flags, false);
4f74fede 4414 break;
87f5fc7e
DA		 4415#endif
4416#if IS_ENABLED(CONFIG_IPV6)
4417 case AF_INET6:
4c79579b 4418 rc = bpf_ipv6_fib_lookup(net, params, flags, false);
4f74fede 4419 break;
87f5fc7e
DA		 4420#endif
4421 }
4f74fede 4422
4c79579b 4423 if (!rc) {
4f74fede
DA		 4424 struct net_device *dev;
4425
4c79579b 4426 dev = dev_get_by_index_rcu(net, params->ifindex);
4f74fede 4427 if (!is_skb_forwardable(dev, skb))
4c79579b 4428 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
4f74fede
DA		 4429 }
4430
4c79579b 4431 return rc;
87f5fc7e
DA		 4432}
4433
4434static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
4435 .func = bpf_skb_fib_lookup,
4436 .gpl_only = true,
4437 .ret_type = RET_INTEGER,
4438 .arg1_type = ARG_PTR_TO_CTX,
4439 .arg2_type = ARG_PTR_TO_MEM,
4440 .arg3_type = ARG_CONST_SIZE,
4441 .arg4_type = ARG_ANYTHING,
4442};
4443
fe94cc29
MX		 4444#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4445static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
4446{
4447 int err;
4448 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
4449
4450 if (!seg6_validate_srh(srh, len))
4451 return -EINVAL;
4452
4453 switch (type) {
4454 case BPF_LWT_ENCAP_SEG6_INLINE:
4455 if (skb->protocol != htons(ETH_P_IPV6))
4456 return -EBADMSG;
4457
4458 err = seg6_do_srh_inline(skb, srh);
4459 break;
4460 case BPF_LWT_ENCAP_SEG6:
4461 skb_reset_inner_headers(skb);
4462 skb->encapsulation = 1;
4463 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
4464 break;
4465 default:
4466 return -EINVAL;
4467 }
4468
4469 bpf_compute_data_pointers(skb);
4470 if (err)
4471 return err;
4472
4473 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
4474 skb_set_transport_header(skb, sizeof(struct ipv6hdr));
4475
4476 return seg6_lookup_nexthop(skb, NULL, 0);
4477}
4478#endif /* CONFIG_IPV6_SEG6_BPF */
4479
4480BPF_CALL_4(bpf_lwt_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
4481 u32, len)
4482{
4483 switch (type) {
4484#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4485 case BPF_LWT_ENCAP_SEG6:
4486 case BPF_LWT_ENCAP_SEG6_INLINE:
4487 return bpf_push_seg6_encap(skb, type, hdr, len);
4488#endif
4489 default:
4490 return -EINVAL;
4491 }
4492}
4493
4494static const struct bpf_func_proto bpf_lwt_push_encap_proto = {
4495 .func = bpf_lwt_push_encap,
4496 .gpl_only = false,
4497 .ret_type = RET_INTEGER,
4498 .arg1_type = ARG_PTR_TO_CTX,
4499 .arg2_type = ARG_ANYTHING,
4500 .arg3_type = ARG_PTR_TO_MEM,
4501 .arg4_type = ARG_CONST_SIZE
4502};
4503
61d76980 4504#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
fe94cc29
MX		 4505BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
4506 const void *, from, u32, len)
4507{
fe94cc29
MX		 4508 struct seg6_bpf_srh_state *srh_state =
4509 this_cpu_ptr(&seg6_bpf_srh_states);
486cdf21 4510 struct ipv6_sr_hdr *srh = srh_state->srh;
fe94cc29 4511 void *srh_tlvs, *srh_end, *ptr;
fe94cc29
MX		 4512 int srhoff = 0;
4513
486cdf21 4514 if (srh == NULL)
fe94cc29
MX		 4515 return -EINVAL;
4516
fe94cc29
MX		 4517 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
4518 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
4519
4520 ptr = skb->data + offset;
4521 if (ptr >= srh_tlvs && ptr + len <= srh_end)
486cdf21 4522 srh_state->valid = false;
fe94cc29
MX		 4523 else if (ptr < (void *)&srh->flags ||
4524 ptr + len > (void *)&srh->segments)
4525 return -EFAULT;
4526
4527 if (unlikely(bpf_try_make_writable(skb, offset + len)))
4528 return -EFAULT;
486cdf21
MX		 4529 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
4530 return -EINVAL;
4531 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
fe94cc29
MX		 4532
4533 memcpy(skb->data + offset, from, len);
4534 return 0;
fe94cc29
MX		 4535}
4536
4537static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
4538 .func = bpf_lwt_seg6_store_bytes,
4539 .gpl_only = false,
4540 .ret_type = RET_INTEGER,
4541 .arg1_type = ARG_PTR_TO_CTX,
4542 .arg2_type = ARG_ANYTHING,
4543 .arg3_type = ARG_PTR_TO_MEM,
4544 .arg4_type = ARG_CONST_SIZE
4545};
4546
486cdf21 4547static void bpf_update_srh_state(struct sk_buff *skb)
fe94cc29 4548{
fe94cc29
MX		 4549 struct seg6_bpf_srh_state *srh_state =
4550 this_cpu_ptr(&seg6_bpf_srh_states);
fe94cc29 4551 int srhoff = 0;
fe94cc29 4552
486cdf21
MX		 4553 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
4554 srh_state->srh = NULL;
4555 } else {
4556 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
4557 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
4558 srh_state->valid = true;
fe94cc29 4559 }
486cdf21
MX		 4560}
4561
4562BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
4563 u32, action, void *, param, u32, param_len)
4564{
4565 struct seg6_bpf_srh_state *srh_state =
4566 this_cpu_ptr(&seg6_bpf_srh_states);
4567 int hdroff = 0;
4568 int err;
fe94cc29
MX		 4569
4570 switch (action) {
4571 case SEG6_LOCAL_ACTION_END_X:
486cdf21
MX		 4572 if (!seg6_bpf_has_valid_srh(skb))
4573 return -EBADMSG;
fe94cc29
MX		 4574 if (param_len != sizeof(struct in6_addr))
4575 return -EINVAL;
4576 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
4577 case SEG6_LOCAL_ACTION_END_T:
486cdf21
MX		 4578 if (!seg6_bpf_has_valid_srh(skb))
4579 return -EBADMSG;
fe94cc29
MX		 4580 if (param_len != sizeof(int))
4581 return -EINVAL;
4582 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
486cdf21
MX		 4583 case SEG6_LOCAL_ACTION_END_DT6:
4584 if (!seg6_bpf_has_valid_srh(skb))
4585 return -EBADMSG;
fe94cc29
MX		 4586 if (param_len != sizeof(int))
4587 return -EINVAL;
486cdf21
MX		 4588
4589 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
4590 return -EBADMSG;
4591 if (!pskb_pull(skb, hdroff))
4592 return -EBADMSG;
4593
4594 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
4595 skb_reset_network_header(skb);
4596 skb_reset_transport_header(skb);
4597 skb->encapsulation = 0;
4598
4599 bpf_compute_data_pointers(skb);
4600 bpf_update_srh_state(skb);
fe94cc29
MX		 4601 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
4602 case SEG6_LOCAL_ACTION_END_B6:
486cdf21
MX		 4603 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
4604 return -EBADMSG;
fe94cc29
MX		 4605 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
4606 param, param_len);
4607 if (!err)
486cdf21
MX		 4608 bpf_update_srh_state(skb);
4609
fe94cc29
MX		 4610 return err;
4611 case SEG6_LOCAL_ACTION_END_B6_ENCAP:
486cdf21
MX		 4612 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
4613 return -EBADMSG;
fe94cc29
MX		 4614 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
4615 param, param_len);
4616 if (!err)
486cdf21
MX		 4617 bpf_update_srh_state(skb);
4618
fe94cc29
MX		 4619 return err;
4620 default:
4621 return -EINVAL;
4622 }
fe94cc29
MX		 4623}
4624
4625static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
4626 .func = bpf_lwt_seg6_action,
4627 .gpl_only = false,
4628 .ret_type = RET_INTEGER,
4629 .arg1_type = ARG_PTR_TO_CTX,
4630 .arg2_type = ARG_ANYTHING,
4631 .arg3_type = ARG_PTR_TO_MEM,
4632 .arg4_type = ARG_CONST_SIZE
4633};
4634
4635BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
4636 s32, len)
4637{
fe94cc29
MX		 4638 struct seg6_bpf_srh_state *srh_state =
4639 this_cpu_ptr(&seg6_bpf_srh_states);
486cdf21 4640 struct ipv6_sr_hdr *srh = srh_state->srh;
fe94cc29 4641 void *srh_end, *srh_tlvs, *ptr;
fe94cc29
MX		 4642 struct ipv6hdr *hdr;
4643 int srhoff = 0;
4644 int ret;
4645
486cdf21 4646 if (unlikely(srh == NULL))
fe94cc29 4647 return -EINVAL;
fe94cc29
MX		 4648
4649 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
4650 ((srh->first_segment + 1) << 4));
4651 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
4652 srh_state->hdrlen);
4653 ptr = skb->data + offset;
4654
4655 if (unlikely(ptr < srh_tlvs || ptr > srh_end))
4656 return -EFAULT;
4657 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
4658 return -EFAULT;
4659
4660 if (len > 0) {
4661 ret = skb_cow_head(skb, len);
4662 if (unlikely(ret < 0))
4663 return ret;
4664
4665 ret = bpf_skb_net_hdr_push(skb, offset, len);
4666 } else {
4667 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
4668 }
4669
4670 bpf_compute_data_pointers(skb);
4671 if (unlikely(ret < 0))
4672 return ret;
4673
4674 hdr = (struct ipv6hdr *)skb->data;
4675 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
4676
486cdf21
MX		 4677 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
4678 return -EINVAL;
4679 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
fe94cc29 4680 srh_state->hdrlen += len;
486cdf21 4681 srh_state->valid = false;
fe94cc29 4682 return 0;
fe94cc29
MX		 4683}
4684
4685static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
4686 .func = bpf_lwt_seg6_adjust_srh,
4687 .gpl_only = false,
4688 .ret_type = RET_INTEGER,
4689 .arg1_type = ARG_PTR_TO_CTX,
4690 .arg2_type = ARG_ANYTHING,
4691 .arg3_type = ARG_ANYTHING,
4692};
61d76980 4693#endif /* CONFIG_IPV6_SEG6_BPF */
fe94cc29 4694
df3f94a0
AB		 4695#ifdef CONFIG_INET
4696static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
4697 struct sk_buff *skb, u8 family, u8 proto)
6acc9b43 4698{
6acc9b43
JS		 4699 bool refcounted = false;
4700 struct sock *sk = NULL;
67e89ac3
JS		 4701 int dif = 0;
4702
4703 if (skb->dev)
4704 dif = skb->dev->ifindex;
6acc9b43
JS		 4705
4706 if (family == AF_INET) {
4707 __be32 src4 = tuple->ipv4.saddr;
4708 __be32 dst4 = tuple->ipv4.daddr;
4709 int sdif = inet_sdif(skb);
4710
4711 if (proto == IPPROTO_TCP)
4712 sk = __inet_lookup(net, &tcp_hashinfo, skb, 0,
4713 src4, tuple->ipv4.sport,
4714 dst4, tuple->ipv4.dport,
4715 dif, sdif, &refcounted);
4716 else
4717 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
4718 dst4, tuple->ipv4.dport,
4719 dif, sdif, &udp_table, skb);
d71019b5 4720#if IS_REACHABLE(CONFIG_IPV6)
6acc9b43
JS		 4721 } else {
4722 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
4723 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
4724 int sdif = inet6_sdif(skb);
4725
4726 if (proto == IPPROTO_TCP)
4727 sk = __inet6_lookup(net, &tcp_hashinfo, skb, 0,
4728 src6, tuple->ipv6.sport,
4729 dst6, tuple->ipv6.dport,
4730 dif, sdif, &refcounted);
4731 else
4732 sk = __udp6_lib_lookup(net, src6, tuple->ipv6.sport,
4733 dst6, tuple->ipv6.dport,
4734 dif, sdif, &udp_table, skb);
4735#endif
4736 }
4737
4738 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
4739 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
4740 sk = NULL;
4741 }
4742 return sk;
4743}
4744
4745/* bpf_sk_lookup performs the core lookup for different types of sockets,
4746 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
4747 * Returns the socket as an 'unsigned long' to simplify the casting in the
4748 * callers to satisfy BPF_CALL declarations.
4749 */
4750static unsigned long
4751bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
4752 u8 proto, u64 netns_id, u64 flags)
4753{
4754 struct net *caller_net;
4755 struct sock *sk = NULL;
4756 u8 family = AF_UNSPEC;
4757 struct net *net;
4758
4759 family = len == sizeof(tuple->ipv4) ? AF_INET : AF_INET6;
4760 if (unlikely(family == AF_UNSPEC || netns_id > U32_MAX || flags))
4761 goto out;
4762
4763 if (skb->dev)
4764 caller_net = dev_net(skb->dev);
4765 else
4766 caller_net = sock_net(skb->sk);
4767 if (netns_id) {
4768 net = get_net_ns_by_id(caller_net, netns_id);
4769 if (unlikely(!net))
4770 goto out;
4771 sk = sk_lookup(net, tuple, skb, family, proto);
4772 put_net(net);
4773 } else {
4774 net = caller_net;
4775 sk = sk_lookup(net, tuple, skb, family, proto);
4776 }
4777
4778 if (sk)
4779 sk = sk_to_full_sk(sk);
4780out:
4781 return (unsigned long) sk;
4782}
4783
4784BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
4785 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
4786{
4787 return bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, netns_id, flags);
4788}
4789
4790static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
4791 .func = bpf_sk_lookup_tcp,
4792 .gpl_only = false,
4793 .pkt_access = true,
4794 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
4795 .arg1_type = ARG_PTR_TO_CTX,
4796 .arg2_type = ARG_PTR_TO_MEM,
4797 .arg3_type = ARG_CONST_SIZE,
4798 .arg4_type = ARG_ANYTHING,
4799 .arg5_type = ARG_ANYTHING,
4800};
4801
4802BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
4803 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
4804{
4805 return bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, netns_id, flags);
4806}
4807
4808static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
4809 .func = bpf_sk_lookup_udp,
4810 .gpl_only = false,
4811 .pkt_access = true,
4812 .ret_type = RET_PTR_TO_SOCKET_OR_NULL,
4813 .arg1_type = ARG_PTR_TO_CTX,
4814 .arg2_type = ARG_PTR_TO_MEM,
4815 .arg3_type = ARG_CONST_SIZE,
4816 .arg4_type = ARG_ANYTHING,
4817 .arg5_type = ARG_ANYTHING,
4818};
4819
4820BPF_CALL_1(bpf_sk_release, struct sock *, sk)
4821{
4822 if (!sock_flag(sk, SOCK_RCU_FREE))
4823 sock_gen_put(sk);
4824 return 0;
4825}
4826
4827static const struct bpf_func_proto bpf_sk_release_proto = {
4828 .func = bpf_sk_release,
4829 .gpl_only = false,
4830 .ret_type = RET_INTEGER,
4831 .arg1_type = ARG_PTR_TO_SOCKET,
4832};
df3f94a0 4833#endif /* CONFIG_INET */
6acc9b43 4834
fe94cc29
MX		 4835bool bpf_helper_changes_pkt_data(void *func)
4836{
4837 if (func == bpf_skb_vlan_push ||
4838 func == bpf_skb_vlan_pop ||
4839 func == bpf_skb_store_bytes ||
4840 func == bpf_skb_change_proto ||
4841 func == bpf_skb_change_head ||
0ea488ff 4842 func == sk_skb_change_head ||
fe94cc29 4843 func == bpf_skb_change_tail ||
0ea488ff 4844 func == sk_skb_change_tail ||
fe94cc29
MX		 4845 func == bpf_skb_adjust_room ||
4846 func == bpf_skb_pull_data ||
0ea488ff 4847 func == sk_skb_pull_data ||
fe94cc29
MX		 4848 func == bpf_clone_redirect ||
4849 func == bpf_l3_csum_replace ||
4850 func == bpf_l4_csum_replace ||
4851 func == bpf_xdp_adjust_head ||
4852 func == bpf_xdp_adjust_meta ||
4853 func == bpf_msg_pull_data ||
4854 func == bpf_xdp_adjust_tail ||
61d76980 4855#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
fe94cc29
MX		 4856 func == bpf_lwt_seg6_store_bytes ||
4857 func == bpf_lwt_seg6_adjust_srh ||
61d76980
MX		 4858 func == bpf_lwt_seg6_action ||
4859#endif
4860 func == bpf_lwt_push_encap)
fe94cc29
MX		 4861 return true;
4862
4863 return false;
4864}
4865
d4052c4a 4866static const struct bpf_func_proto *
2492d3b8 4867bpf_base_func_proto(enum bpf_func_id func_id)
89aa0758
AS		 4868{
4869 switch (func_id) {
4870 case BPF_FUNC_map_lookup_elem:
4871 return &bpf_map_lookup_elem_proto;
4872 case BPF_FUNC_map_update_elem:
4873 return &bpf_map_update_elem_proto;
4874 case BPF_FUNC_map_delete_elem:
4875 return &bpf_map_delete_elem_proto;
03e69b50
DB		 4876 case BPF_FUNC_get_prandom_u32:
4877 return &bpf_get_prandom_u32_proto;
c04167ce 4878 case BPF_FUNC_get_smp_processor_id:
80b48c44 4879 return &bpf_get_raw_smp_processor_id_proto;
2d0e30c3
DB		 4880 case BPF_FUNC_get_numa_node_id:
4881 return &bpf_get_numa_node_id_proto;
04fd61ab
AS		 4882 case BPF_FUNC_tail_call:
4883 return &bpf_tail_call_proto;
17ca8cbf
DB		 4884 case BPF_FUNC_ktime_get_ns:
4885 return &bpf_ktime_get_ns_proto;
0756ea3e 4886 case BPF_FUNC_trace_printk:
1be7f75d
AS		 4887 if (capable(CAP_SYS_ADMIN))
4888 return bpf_get_trace_printk_proto();
2cc0608e 4889 /* else: fall through */
89aa0758
AS		 4890 default:
4891 return NULL;
4892 }
4893}
4894
ae2cf1c4 4895static const struct bpf_func_proto *
5e43f899 4896sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
ae2cf1c4
DA		 4897{
4898 switch (func_id) {
4899 /* inet and inet6 sockets are created in a process
4900 * context so there is always a valid uid/gid
4901 */
4902 case BPF_FUNC_get_current_uid_gid:
4903 return &bpf_get_current_uid_gid_proto;
cd339431
RG		 4904 case BPF_FUNC_get_local_storage:
4905 return &bpf_get_local_storage_proto;
ae2cf1c4
DA		 4906 default:
4907 return bpf_base_func_proto(func_id);
4908 }
4909}
4910
4fbac77d
AI		 4911static const struct bpf_func_proto *
4912sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4913{
4914 switch (func_id) {
4915 /* inet and inet6 sockets are created in a process
4916 * context so there is always a valid uid/gid
4917 */
4918 case BPF_FUNC_get_current_uid_gid:
4919 return &bpf_get_current_uid_gid_proto;
d74bad4e
AI		 4920 case BPF_FUNC_bind:
4921 switch (prog->expected_attach_type) {
4922 case BPF_CGROUP_INET4_CONNECT:
4923 case BPF_CGROUP_INET6_CONNECT:
4924 return &bpf_bind_proto;
4925 default:
4926 return NULL;
4927 }
d692f113
AI		 4928 case BPF_FUNC_get_socket_cookie:
4929 return &bpf_get_socket_cookie_sock_addr_proto;
cd339431
RG		 4930 case BPF_FUNC_get_local_storage:
4931 return &bpf_get_local_storage_proto;
4fbac77d
AI		 4932 default:
4933 return bpf_base_func_proto(func_id);
4934 }
4935}
4936
2492d3b8 4937static const struct bpf_func_proto *
5e43f899 4938sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
2492d3b8
DB		 4939{
4940 switch (func_id) {
4941 case BPF_FUNC_skb_load_bytes:
4942 return &bpf_skb_load_bytes_proto;
4e1ec56c
DB		 4943 case BPF_FUNC_skb_load_bytes_relative:
4944 return &bpf_skb_load_bytes_relative_proto;
91b8270f
CF		 4945 case BPF_FUNC_get_socket_cookie:
4946 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 4947 case BPF_FUNC_get_socket_uid:
4948 return &bpf_get_socket_uid_proto;
2492d3b8
DB		 4949 default:
4950 return bpf_base_func_proto(func_id);
4951 }
4952}
4953
cd339431
RG		 4954static const struct bpf_func_proto *
4955cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4956{
4957 switch (func_id) {
4958 case BPF_FUNC_get_local_storage:
4959 return &bpf_get_local_storage_proto;
4960 default:
4961 return sk_filter_func_proto(func_id, prog);
4962 }
4963}
4964
608cd71a 4965static const struct bpf_func_proto *
5e43f899 4966tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
608cd71a
AS		 4967{
4968 switch (func_id) {
4969 case BPF_FUNC_skb_store_bytes:
4970 return &bpf_skb_store_bytes_proto;
05c74e5e
DB		 4971 case BPF_FUNC_skb_load_bytes:
4972 return &bpf_skb_load_bytes_proto;
4e1ec56c
DB		 4973 case BPF_FUNC_skb_load_bytes_relative:
4974 return &bpf_skb_load_bytes_relative_proto;
36bbef52
DB		 4975 case BPF_FUNC_skb_pull_data:
4976 return &bpf_skb_pull_data_proto;
7d672345
DB		 4977 case BPF_FUNC_csum_diff:
4978 return &bpf_csum_diff_proto;
36bbef52
DB		 4979 case BPF_FUNC_csum_update:
4980 return &bpf_csum_update_proto;
91bc4822
AS		 4981 case BPF_FUNC_l3_csum_replace:
4982 return &bpf_l3_csum_replace_proto;
4983 case BPF_FUNC_l4_csum_replace:
4984 return &bpf_l4_csum_replace_proto;
3896d655
AS		 4985 case BPF_FUNC_clone_redirect:
4986 return &bpf_clone_redirect_proto;
8d20aabe
DB		 4987 case BPF_FUNC_get_cgroup_classid:
4988 return &bpf_get_cgroup_classid_proto;
4e10df9a
AS		 4989 case BPF_FUNC_skb_vlan_push:
4990 return &bpf_skb_vlan_push_proto;
4991 case BPF_FUNC_skb_vlan_pop:
4992 return &bpf_skb_vlan_pop_proto;
6578171a
DB		 4993 case BPF_FUNC_skb_change_proto:
4994 return &bpf_skb_change_proto_proto;
d2485c42
DB		 4995 case BPF_FUNC_skb_change_type:
4996 return &bpf_skb_change_type_proto;
2be7e212
DB		 4997 case BPF_FUNC_skb_adjust_room:
4998 return &bpf_skb_adjust_room_proto;
5293efe6
DB		 4999 case BPF_FUNC_skb_change_tail:
5000 return &bpf_skb_change_tail_proto;
d3aa45ce
AS		 5001 case BPF_FUNC_skb_get_tunnel_key:
5002 return &bpf_skb_get_tunnel_key_proto;
5003 case BPF_FUNC_skb_set_tunnel_key:
14ca0751
DB		 5004 return bpf_get_skb_set_tunnel_proto(func_id);
5005 case BPF_FUNC_skb_get_tunnel_opt:
5006 return &bpf_skb_get_tunnel_opt_proto;
5007 case BPF_FUNC_skb_set_tunnel_opt:
5008 return bpf_get_skb_set_tunnel_proto(func_id);
27b29f63
AS		 5009 case BPF_FUNC_redirect:
5010 return &bpf_redirect_proto;
c46646d0
DB		 5011 case BPF_FUNC_get_route_realm:
5012 return &bpf_get_route_realm_proto;
13c5c240
DB		 5013 case BPF_FUNC_get_hash_recalc:
5014 return &bpf_get_hash_recalc_proto;
7a4b28c6
DB		 5015 case BPF_FUNC_set_hash_invalid:
5016 return &bpf_set_hash_invalid_proto;
ded092cd
DB		 5017 case BPF_FUNC_set_hash:
5018 return &bpf_set_hash_proto;
bd570ff9 5019 case BPF_FUNC_perf_event_output:
555c8a86 5020 return &bpf_skb_event_output_proto;
80b48c44
DB		 5021 case BPF_FUNC_get_smp_processor_id:
5022 return &bpf_get_smp_processor_id_proto;
747ea55e
DB		 5023 case BPF_FUNC_skb_under_cgroup:
5024 return &bpf_skb_under_cgroup_proto;
91b8270f
CF		 5025 case BPF_FUNC_get_socket_cookie:
5026 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 5027 case BPF_FUNC_get_socket_uid:
5028 return &bpf_get_socket_uid_proto;
cb20b08e
DB		 5029 case BPF_FUNC_fib_lookup:
5030 return &bpf_skb_fib_lookup_proto;
12bed760
EB		 5031#ifdef CONFIG_XFRM
5032 case BPF_FUNC_skb_get_xfrm_state:
5033 return &bpf_skb_get_xfrm_state_proto;
5034#endif
cb20b08e
DB		 5035#ifdef CONFIG_SOCK_CGROUP_DATA
5036 case BPF_FUNC_skb_cgroup_id:
5037 return &bpf_skb_cgroup_id_proto;
77236281
AI		 5038 case BPF_FUNC_skb_ancestor_cgroup_id:
5039 return &bpf_skb_ancestor_cgroup_id_proto;
cb20b08e 5040#endif
df3f94a0 5041#ifdef CONFIG_INET
6acc9b43
JS		 5042 case BPF_FUNC_sk_lookup_tcp:
5043 return &bpf_sk_lookup_tcp_proto;
5044 case BPF_FUNC_sk_lookup_udp:
5045 return &bpf_sk_lookup_udp_proto;
5046 case BPF_FUNC_sk_release:
5047 return &bpf_sk_release_proto;
df3f94a0 5048#endif
608cd71a 5049 default:
2492d3b8 5050 return bpf_base_func_proto(func_id);
608cd71a
AS		 5051 }
5052}
5053
6a773a15 5054static const struct bpf_func_proto *
5e43f899 5055xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6a773a15 5056{
4de16969
DB		 5057 switch (func_id) {
5058 case BPF_FUNC_perf_event_output:
5059 return &bpf_xdp_event_output_proto;
669dc4d7
DB		 5060 case BPF_FUNC_get_smp_processor_id:
5061 return &bpf_get_smp_processor_id_proto;
205c3807
DB		 5062 case BPF_FUNC_csum_diff:
5063 return &bpf_csum_diff_proto;
17bedab2
MKL		 5064 case BPF_FUNC_xdp_adjust_head:
5065 return &bpf_xdp_adjust_head_proto;
de8f3a83
DB		 5066 case BPF_FUNC_xdp_adjust_meta:
5067 return &bpf_xdp_adjust_meta_proto;
814abfab
JF		 5068 case BPF_FUNC_redirect:
5069 return &bpf_xdp_redirect_proto;
97f91a7c 5070 case BPF_FUNC_redirect_map:
e4a8e817 5071 return &bpf_xdp_redirect_map_proto;
b32cc5b9
NS		 5072 case BPF_FUNC_xdp_adjust_tail:
5073 return &bpf_xdp_adjust_tail_proto;
87f5fc7e
DA		 5074 case BPF_FUNC_fib_lookup:
5075 return &bpf_xdp_fib_lookup_proto;
4de16969 5076 default:
2492d3b8 5077 return bpf_base_func_proto(func_id);
4de16969 5078 }
6a773a15
BB		 5079}
5080
604326b4
DB		 5081const struct bpf_func_proto bpf_sock_map_update_proto __weak;
5082const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
5083
8c4b4c7e 5084static const struct bpf_func_proto *
5e43f899 5085sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
8c4b4c7e
LB		 5086{
5087 switch (func_id) {
5088 case BPF_FUNC_setsockopt:
5089 return &bpf_setsockopt_proto;
cd86d1fd
LB		 5090 case BPF_FUNC_getsockopt:
5091 return &bpf_getsockopt_proto;
b13d8807
LB		 5092 case BPF_FUNC_sock_ops_cb_flags_set:
5093 return &bpf_sock_ops_cb_flags_set_proto;
174a79ff
JF		 5094 case BPF_FUNC_sock_map_update:
5095 return &bpf_sock_map_update_proto;
81110384
JF		 5096 case BPF_FUNC_sock_hash_update:
5097 return &bpf_sock_hash_update_proto;
d692f113
AI		 5098 case BPF_FUNC_get_socket_cookie:
5099 return &bpf_get_socket_cookie_sock_ops_proto;
cd339431
RG		 5100 case BPF_FUNC_get_local_storage:
5101 return &bpf_get_local_storage_proto;
8c4b4c7e
LB		 5102 default:
5103 return bpf_base_func_proto(func_id);
5104 }
5105}
5106
604326b4
DB		 5107const struct bpf_func_proto bpf_msg_redirect_map_proto __weak;
5108const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak;
5109
5e43f899
AI		 5110static const struct bpf_func_proto *
5111sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
4f738adb
JF		 5112{
5113 switch (func_id) {
5114 case BPF_FUNC_msg_redirect_map:
5115 return &bpf_msg_redirect_map_proto;
81110384
JF		 5116 case BPF_FUNC_msg_redirect_hash:
5117 return &bpf_msg_redirect_hash_proto;
2a100317
JF		 5118 case BPF_FUNC_msg_apply_bytes:
5119 return &bpf_msg_apply_bytes_proto;
91843d54
JF		 5120 case BPF_FUNC_msg_cork_bytes:
5121 return &bpf_msg_cork_bytes_proto;
015632bb
JF		 5122 case BPF_FUNC_msg_pull_data:
5123 return &bpf_msg_pull_data_proto;
cd339431
RG		 5124 case BPF_FUNC_get_local_storage:
5125 return &bpf_get_local_storage_proto;
4f738adb
JF		 5126 default:
5127 return bpf_base_func_proto(func_id);
5128 }
5129}
5130
604326b4
DB		 5131const struct bpf_func_proto bpf_sk_redirect_map_proto __weak;
5132const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak;
5133
5e43f899
AI		 5134static const struct bpf_func_proto *
5135sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
b005fd18
JF		 5136{
5137 switch (func_id) {
8a31db56
JF		 5138 case BPF_FUNC_skb_store_bytes:
5139 return &bpf_skb_store_bytes_proto;
b005fd18
JF		 5140 case BPF_FUNC_skb_load_bytes:
5141 return &bpf_skb_load_bytes_proto;
8a31db56 5142 case BPF_FUNC_skb_pull_data:
0ea488ff 5143 return &sk_skb_pull_data_proto;
8a31db56 5144 case BPF_FUNC_skb_change_tail:
0ea488ff 5145 return &sk_skb_change_tail_proto;
8a31db56 5146 case BPF_FUNC_skb_change_head:
0ea488ff 5147 return &sk_skb_change_head_proto;
b005fd18
JF		 5148 case BPF_FUNC_get_socket_cookie:
5149 return &bpf_get_socket_cookie_proto;
5150 case BPF_FUNC_get_socket_uid:
5151 return &bpf_get_socket_uid_proto;
174a79ff
JF		 5152 case BPF_FUNC_sk_redirect_map:
5153 return &bpf_sk_redirect_map_proto;
81110384
JF		 5154 case BPF_FUNC_sk_redirect_hash:
5155 return &bpf_sk_redirect_hash_proto;
cd339431
RG		 5156 case BPF_FUNC_get_local_storage:
5157 return &bpf_get_local_storage_proto;
df3f94a0 5158#ifdef CONFIG_INET
6acc9b43
JS		 5159 case BPF_FUNC_sk_lookup_tcp:
5160 return &bpf_sk_lookup_tcp_proto;
5161 case BPF_FUNC_sk_lookup_udp:
5162 return &bpf_sk_lookup_udp_proto;
5163 case BPF_FUNC_sk_release:
5164 return &bpf_sk_release_proto;
df3f94a0 5165#endif
b005fd18
JF		 5166 default:
5167 return bpf_base_func_proto(func_id);
5168 }
5169}
5170
d58e468b
PP		 5171static const struct bpf_func_proto *
5172flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5173{
5174 switch (func_id) {
5175 case BPF_FUNC_skb_load_bytes:
5176 return &bpf_skb_load_bytes_proto;
5177 default:
5178 return bpf_base_func_proto(func_id);
5179 }
5180}
5181
cd3092c7
MX		 5182static const struct bpf_func_proto *
5183lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5184{
5185 switch (func_id) {
5186 case BPF_FUNC_skb_load_bytes:
5187 return &bpf_skb_load_bytes_proto;
5188 case BPF_FUNC_skb_pull_data:
5189 return &bpf_skb_pull_data_proto;
5190 case BPF_FUNC_csum_diff:
5191 return &bpf_csum_diff_proto;
5192 case BPF_FUNC_get_cgroup_classid:
5193 return &bpf_get_cgroup_classid_proto;
5194 case BPF_FUNC_get_route_realm:
5195 return &bpf_get_route_realm_proto;
5196 case BPF_FUNC_get_hash_recalc:
5197 return &bpf_get_hash_recalc_proto;
5198 case BPF_FUNC_perf_event_output:
5199 return &bpf_skb_event_output_proto;
5200 case BPF_FUNC_get_smp_processor_id:
5201 return &bpf_get_smp_processor_id_proto;
5202 case BPF_FUNC_skb_under_cgroup:
5203 return &bpf_skb_under_cgroup_proto;
5204 default:
5205 return bpf_base_func_proto(func_id);
5206 }
5207}
5208
5209static const struct bpf_func_proto *
5210lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5211{
5212 switch (func_id) {
5213 case BPF_FUNC_lwt_push_encap:
5214 return &bpf_lwt_push_encap_proto;
5215 default:
5216 return lwt_out_func_proto(func_id, prog);
5217 }
5218}
5219
3a0af8fd 5220static const struct bpf_func_proto *
5e43f899 5221lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
3a0af8fd
TG		 5222{
5223 switch (func_id) {
5224 case BPF_FUNC_skb_get_tunnel_key:
5225 return &bpf_skb_get_tunnel_key_proto;
5226 case BPF_FUNC_skb_set_tunnel_key:
5227 return bpf_get_skb_set_tunnel_proto(func_id);
5228 case BPF_FUNC_skb_get_tunnel_opt:
5229 return &bpf_skb_get_tunnel_opt_proto;
5230 case BPF_FUNC_skb_set_tunnel_opt:
5231 return bpf_get_skb_set_tunnel_proto(func_id);
5232 case BPF_FUNC_redirect:
5233 return &bpf_redirect_proto;
5234 case BPF_FUNC_clone_redirect:
5235 return &bpf_clone_redirect_proto;
5236 case BPF_FUNC_skb_change_tail:
5237 return &bpf_skb_change_tail_proto;
5238 case BPF_FUNC_skb_change_head:
5239 return &bpf_skb_change_head_proto;
5240 case BPF_FUNC_skb_store_bytes:
5241 return &bpf_skb_store_bytes_proto;
5242 case BPF_FUNC_csum_update:
5243 return &bpf_csum_update_proto;
5244 case BPF_FUNC_l3_csum_replace:
5245 return &bpf_l3_csum_replace_proto;
5246 case BPF_FUNC_l4_csum_replace:
5247 return &bpf_l4_csum_replace_proto;
5248 case BPF_FUNC_set_hash_invalid:
5249 return &bpf_set_hash_invalid_proto;
5250 default:
cd3092c7 5251 return lwt_out_func_proto(func_id, prog);
3a0af8fd
TG		 5252 }
5253}
5254
004d4b27
MX		 5255static const struct bpf_func_proto *
5256lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5257{
5258 switch (func_id) {
61d76980 5259#if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
004d4b27
MX		 5260 case BPF_FUNC_lwt_seg6_store_bytes:
5261 return &bpf_lwt_seg6_store_bytes_proto;
5262 case BPF_FUNC_lwt_seg6_action:
5263 return &bpf_lwt_seg6_action_proto;
5264 case BPF_FUNC_lwt_seg6_adjust_srh:
5265 return &bpf_lwt_seg6_adjust_srh_proto;
61d76980 5266#endif
004d4b27
MX		 5267 default:
5268 return lwt_out_func_proto(func_id, prog);
3a0af8fd
TG		 5269 }
5270}
5271
f96da094 5272static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
5e43f899 5273 const struct bpf_prog *prog,
f96da094 5274 struct bpf_insn_access_aux *info)
23994631 5275{
f96da094 5276 const int size_default = sizeof(__u32);
23994631 5277
9bac3d6d
AS		 5278 if (off < 0 || off >= sizeof(struct __sk_buff))
5279 return false;
62c7989b 5280
4936e352 5281 /* The verifier guarantees that size > 0. */
9bac3d6d
AS		 5282 if (off % size != 0)
5283 return false;
62c7989b
DB		 5284
5285 switch (off) {
f96da094
DB		 5286 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
5287 if (off + size > offsetofend(struct __sk_buff, cb[4]))
62c7989b
DB		 5288 return false;
5289 break;
8a31db56
JF		 5290 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
5291 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
5292 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
5293 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
f96da094 5294 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 5295 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094
DB		 5296 case bpf_ctx_range(struct __sk_buff, data_end):
5297 if (size != size_default)
23994631 5298 return false;
31fd8581 5299 break;
d58e468b
PP		 5300 case bpf_ctx_range(struct __sk_buff, flow_keys):
5301 if (size != sizeof(struct bpf_flow_keys *))
5302 return false;
5303 break;
31fd8581 5304 default:
f96da094 5305 /* Only narrow read access allowed for now. */
31fd8581 5306 if (type == BPF_WRITE) {
f96da094 5307 if (size != size_default)
31fd8581
YS		 5308 return false;
5309 } else {
f96da094
DB		 5310 bpf_ctx_record_field_size(info, size_default);
5311 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
23994631 5312 return false;
31fd8581 5313 }
62c7989b 5314 }
9bac3d6d
AS		 5315
5316 return true;
5317}
5318
d691f9e8 5319static bool sk_filter_is_valid_access(int off, int size,
19de99f7 5320 enum bpf_access_type type,
5e43f899 5321 const struct bpf_prog *prog,
23994631 5322 struct bpf_insn_access_aux *info)
d691f9e8 5323{
db58ba45 5324 switch (off) {
f96da094
DB		 5325 case bpf_ctx_range(struct __sk_buff, tc_classid):
5326 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 5327 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094 5328 case bpf_ctx_range(struct __sk_buff, data_end):
d58e468b 5329 case bpf_ctx_range(struct __sk_buff, flow_keys):
8a31db56 5330 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
045efa82 5331 return false;
db58ba45 5332 }
045efa82 5333
d691f9e8
AS		 5334 if (type == BPF_WRITE) {
5335 switch (off) {
f96da094 5336 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 5337 break;
5338 default:
5339 return false;
5340 }
5341 }
5342
5e43f899 5343 return bpf_skb_is_valid_access(off, size, type, prog, info);
d691f9e8
AS		 5344}
5345
3a0af8fd
TG		 5346static bool lwt_is_valid_access(int off, int size,
5347 enum bpf_access_type type,
5e43f899 5348 const struct bpf_prog *prog,
23994631 5349 struct bpf_insn_access_aux *info)
3a0af8fd
TG		 5350{
5351 switch (off) {
f96da094 5352 case bpf_ctx_range(struct __sk_buff, tc_classid):
8a31db56 5353 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
de8f3a83 5354 case bpf_ctx_range(struct __sk_buff, data_meta):
d58e468b 5355 case bpf_ctx_range(struct __sk_buff, flow_keys):
3a0af8fd
TG		 5356 return false;
5357 }
5358
5359 if (type == BPF_WRITE) {
5360 switch (off) {
f96da094
DB		 5361 case bpf_ctx_range(struct __sk_buff, mark):
5362 case bpf_ctx_range(struct __sk_buff, priority):
5363 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3a0af8fd
TG		 5364 break;
5365 default:
5366 return false;
5367 }
5368 }
5369
f96da094
DB		 5370 switch (off) {
5371 case bpf_ctx_range(struct __sk_buff, data):
5372 info->reg_type = PTR_TO_PACKET;
5373 break;
5374 case bpf_ctx_range(struct __sk_buff, data_end):
5375 info->reg_type = PTR_TO_PACKET_END;
5376 break;
5377 }
5378
5e43f899 5379 return bpf_skb_is_valid_access(off, size, type, prog, info);
3a0af8fd
TG		 5380}
5381
aac3fc32
AI		 5382/* Attach type specific accesses */
5383static bool __sock_filter_check_attach_type(int off,
5384 enum bpf_access_type access_type,
5385 enum bpf_attach_type attach_type)
61023658 5386{
aac3fc32
AI		 5387 switch (off) {
5388 case offsetof(struct bpf_sock, bound_dev_if):
5389 case offsetof(struct bpf_sock, mark):
5390 case offsetof(struct bpf_sock, priority):
5391 switch (attach_type) {
5392 case BPF_CGROUP_INET_SOCK_CREATE:
5393 goto full_access;
5394 default:
5395 return false;
5396 }
5397 case bpf_ctx_range(struct bpf_sock, src_ip4):
5398 switch (attach_type) {
5399 case BPF_CGROUP_INET4_POST_BIND:
5400 goto read_only;
5401 default:
5402 return false;
5403 }
5404 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
5405 switch (attach_type) {
5406 case BPF_CGROUP_INET6_POST_BIND:
5407 goto read_only;
5408 default:
5409 return false;
5410 }
5411 case bpf_ctx_range(struct bpf_sock, src_port):
5412 switch (attach_type) {
5413 case BPF_CGROUP_INET4_POST_BIND:
5414 case BPF_CGROUP_INET6_POST_BIND:
5415 goto read_only;
61023658
DA		 5416 default:
5417 return false;
5418 }
5419 }
aac3fc32
AI		 5420read_only:
5421 return access_type == BPF_READ;
5422full_access:
5423 return true;
5424}
5425
5426static bool __sock_filter_check_size(int off, int size,
5427 struct bpf_insn_access_aux *info)
5428{
5429 const int size_default = sizeof(__u32);
61023658 5430
aac3fc32
AI		 5431 switch (off) {
5432 case bpf_ctx_range(struct bpf_sock, src_ip4):
5433 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
5434 bpf_ctx_record_field_size(info, size_default);
5435 return bpf_ctx_narrow_access_ok(off, size, size_default);
5436 }
5437
5438 return size == size_default;
5439}
5440
c64b7983
JS		 5441bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
5442 struct bpf_insn_access_aux *info)
aac3fc32
AI		 5443{
5444 if (off < 0 || off >= sizeof(struct bpf_sock))
61023658 5445 return false;
61023658
DA		 5446 if (off % size != 0)
5447 return false;
aac3fc32 5448 if (!__sock_filter_check_size(off, size, info))
61023658 5449 return false;
61023658
DA		 5450 return true;
5451}
5452
c64b7983
JS		 5453static bool sock_filter_is_valid_access(int off, int size,
5454 enum bpf_access_type type,
5455 const struct bpf_prog *prog,
5456 struct bpf_insn_access_aux *info)
5457{
5458 if (!bpf_sock_is_valid_access(off, size, type, info))
5459 return false;
5460 return __sock_filter_check_attach_type(off, type,
5461 prog->expected_attach_type);
5462}
5463
047b0ecd
DB		 5464static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
5465 const struct bpf_prog *prog, int drop_verdict)
36bbef52
DB		 5466{
5467 struct bpf_insn *insn = insn_buf;
5468
5469 if (!direct_write)
5470 return 0;
5471
5472 /* if (!skb->cloned)
5473 * goto start;
5474 *
5475 * (Fast-path, otherwise approximation that we might be
5476 * a clone, do the rest in helper.)
5477 */
5478 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
5479 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
5480 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
5481
5482 /* ret = bpf_skb_pull_data(skb, 0); */
5483 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
5484 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
5485 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
5486 BPF_FUNC_skb_pull_data);
5487 /* if (!ret)
5488 * goto restore;
5489 * return TC_ACT_SHOT;
5490 */
5491 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
047b0ecd 5492 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
36bbef52
DB		 5493 *insn++ = BPF_EXIT_INSN();
5494
5495 /* restore: */
5496 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
5497 /* start: */
5498 *insn++ = prog->insnsi[0];
5499
5500 return insn - insn_buf;
5501}
5502
e0cea7ce
DB		 5503static int bpf_gen_ld_abs(const struct bpf_insn *orig,
5504 struct bpf_insn *insn_buf)
5505{
5506 bool indirect = BPF_MODE(orig->code) == BPF_IND;
5507 struct bpf_insn *insn = insn_buf;
5508
5509 /* We're guaranteed here that CTX is in R6. */
5510 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
5511 if (!indirect) {
5512 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
5513 } else {
5514 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
5515 if (orig->imm)
5516 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
5517 }
5518
5519 switch (BPF_SIZE(orig->code)) {
5520 case BPF_B:
5521 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
5522 break;
5523 case BPF_H:
5524 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
5525 break;
5526 case BPF_W:
5527 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
5528 break;
5529 }
5530
5531 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
5532 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
5533 *insn++ = BPF_EXIT_INSN();
5534
5535 return insn - insn_buf;
5536}
5537
047b0ecd
DB		 5538static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
5539 const struct bpf_prog *prog)
5540{
5541 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
5542}
5543
d691f9e8 5544static bool tc_cls_act_is_valid_access(int off, int size,
19de99f7 5545 enum bpf_access_type type,
5e43f899 5546 const struct bpf_prog *prog,
23994631 5547 struct bpf_insn_access_aux *info)
d691f9e8
AS		 5548{
5549 if (type == BPF_WRITE) {
5550 switch (off) {
f96da094
DB		 5551 case bpf_ctx_range(struct __sk_buff, mark):
5552 case bpf_ctx_range(struct __sk_buff, tc_index):
5553 case bpf_ctx_range(struct __sk_buff, priority):
5554 case bpf_ctx_range(struct __sk_buff, tc_classid):
5555 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 5556 break;
5557 default:
5558 return false;
5559 }
5560 }
19de99f7 5561
f96da094
DB		 5562 switch (off) {
5563 case bpf_ctx_range(struct __sk_buff, data):
5564 info->reg_type = PTR_TO_PACKET;
5565 break;
de8f3a83
DB		 5566 case bpf_ctx_range(struct __sk_buff, data_meta):
5567 info->reg_type = PTR_TO_PACKET_META;
5568 break;
f96da094
DB		 5569 case bpf_ctx_range(struct __sk_buff, data_end):
5570 info->reg_type = PTR_TO_PACKET_END;
5571 break;
d58e468b 5572 case bpf_ctx_range(struct __sk_buff, flow_keys):
8a31db56
JF		 5573 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
5574 return false;
f96da094
DB		 5575 }
5576
5e43f899 5577 return bpf_skb_is_valid_access(off, size, type, prog, info);
d691f9e8
AS		 5578}
5579
1afaf661 5580static bool __is_valid_xdp_access(int off, int size)
6a773a15
BB		 5581{
5582 if (off < 0 || off >= sizeof(struct xdp_md))
5583 return false;
5584 if (off % size != 0)
5585 return false;
6088b582 5586 if (size != sizeof(__u32))
6a773a15
BB		 5587 return false;
5588
5589 return true;
5590}
5591
5592static bool xdp_is_valid_access(int off, int size,
5593 enum bpf_access_type type,
5e43f899 5594 const struct bpf_prog *prog,
23994631 5595 struct bpf_insn_access_aux *info)
6a773a15 5596{
0d830032
JK		 5597 if (type == BPF_WRITE) {
5598 if (bpf_prog_is_dev_bound(prog->aux)) {
5599 switch (off) {
5600 case offsetof(struct xdp_md, rx_queue_index):
5601 return __is_valid_xdp_access(off, size);
5602 }
5603 }
6a773a15 5604 return false;
0d830032 5605 }
6a773a15
BB		 5606
5607 switch (off) {
5608 case offsetof(struct xdp_md, data):
23994631 5609 info->reg_type = PTR_TO_PACKET;
6a773a15 5610 break;
de8f3a83
DB		 5611 case offsetof(struct xdp_md, data_meta):
5612 info->reg_type = PTR_TO_PACKET_META;
5613 break;
6a773a15 5614 case offsetof(struct xdp_md, data_end):
23994631 5615 info->reg_type = PTR_TO_PACKET_END;
6a773a15
BB		 5616 break;
5617 }
5618
1afaf661 5619 return __is_valid_xdp_access(off, size);
6a773a15
BB		 5620}
5621
5622void bpf_warn_invalid_xdp_action(u32 act)
5623{
9beb8bed
DB		 5624 const u32 act_max = XDP_REDIRECT;
5625
5626 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
5627 act > act_max ? "Illegal" : "Driver unsupported",
5628 act);
6a773a15
BB		 5629}
5630EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
5631
4fbac77d
AI		 5632static bool sock_addr_is_valid_access(int off, int size,
5633 enum bpf_access_type type,
5634 const struct bpf_prog *prog,
5635 struct bpf_insn_access_aux *info)
5636{
5637 const int size_default = sizeof(__u32);
5638
5639 if (off < 0 || off >= sizeof(struct bpf_sock_addr))
5640 return false;
5641 if (off % size != 0)
5642 return false;
5643
5644 /* Disallow access to IPv6 fields from IPv4 contex and vise
5645 * versa.
5646 */
5647 switch (off) {
5648 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
5649 switch (prog->expected_attach_type) {
5650 case BPF_CGROUP_INET4_BIND:
d74bad4e 5651 case BPF_CGROUP_INET4_CONNECT:
1cedee13 5652 case BPF_CGROUP_UDP4_SENDMSG:
4fbac77d
AI		 5653 break;
5654 default:
5655 return false;
5656 }
5657 break;
5658 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
5659 switch (prog->expected_attach_type) {
5660 case BPF_CGROUP_INET6_BIND:
d74bad4e 5661 case BPF_CGROUP_INET6_CONNECT:
1cedee13
AI		 5662 case BPF_CGROUP_UDP6_SENDMSG:
5663 break;
5664 default:
5665 return false;
5666 }
5667 break;
5668 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
5669 switch (prog->expected_attach_type) {
5670 case BPF_CGROUP_UDP4_SENDMSG:
5671 break;
5672 default:
5673 return false;
5674 }
5675 break;
5676 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
5677 msg_src_ip6[3]):
5678 switch (prog->expected_attach_type) {
5679 case BPF_CGROUP_UDP6_SENDMSG:
4fbac77d
AI		 5680 break;
5681 default:
5682 return false;
5683 }
5684 break;
5685 }
5686
5687 switch (off) {
5688 case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
5689 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
1cedee13
AI		 5690 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
5691 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
5692 msg_src_ip6[3]):
4fbac77d
AI		 5693 /* Only narrow read access allowed for now. */
5694 if (type == BPF_READ) {
5695 bpf_ctx_record_field_size(info, size_default);
5696 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
5697 return false;
5698 } else {
5699 if (size != size_default)
5700 return false;
5701 }
5702 break;
5703 case bpf_ctx_range(struct bpf_sock_addr, user_port):
5704 if (size != size_default)
5705 return false;
5706 break;
5707 default:
5708 if (type == BPF_READ) {
5709 if (size != size_default)
5710 return false;
5711 } else {
5712 return false;
5713 }
5714 }
5715
5716 return true;
5717}
5718
44f0e430
LB		 5719static bool sock_ops_is_valid_access(int off, int size,
5720 enum bpf_access_type type,
5e43f899 5721 const struct bpf_prog *prog,
44f0e430 5722 struct bpf_insn_access_aux *info)
40304b2a 5723{
44f0e430
LB		 5724 const int size_default = sizeof(__u32);
5725
40304b2a
LB		 5726 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
5727 return false;
44f0e430 5728
40304b2a
LB		 5729 /* The verifier guarantees that size > 0. */
5730 if (off % size != 0)
5731 return false;
40304b2a 5732
40304b2a
LB		 5733 if (type == BPF_WRITE) {
5734 switch (off) {
2585cd62 5735 case offsetof(struct bpf_sock_ops, reply):
6f9bd3d7 5736 case offsetof(struct bpf_sock_ops, sk_txhash):
44f0e430
LB		 5737 if (size != size_default)
5738 return false;
40304b2a
LB		 5739 break;
5740 default:
5741 return false;
5742 }
44f0e430
LB		 5743 } else {
5744 switch (off) {
5745 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
5746 bytes_acked):
5747 if (size != sizeof(__u64))
5748 return false;
5749 break;
5750 default:
5751 if (size != size_default)
5752 return false;
5753 break;
5754 }
40304b2a
LB		 5755 }
5756
44f0e430 5757 return true;
40304b2a
LB		 5758}
5759
8a31db56
JF		 5760static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
5761 const struct bpf_prog *prog)
5762{
047b0ecd 5763 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
8a31db56
JF		 5764}
5765
b005fd18
JF		 5766static bool sk_skb_is_valid_access(int off, int size,
5767 enum bpf_access_type type,
5e43f899 5768 const struct bpf_prog *prog,
b005fd18
JF		 5769 struct bpf_insn_access_aux *info)
5770{
de8f3a83
DB		 5771 switch (off) {
5772 case bpf_ctx_range(struct __sk_buff, tc_classid):
5773 case bpf_ctx_range(struct __sk_buff, data_meta):
d58e468b 5774 case bpf_ctx_range(struct __sk_buff, flow_keys):
de8f3a83
DB		 5775 return false;
5776 }
5777
8a31db56
JF		 5778 if (type == BPF_WRITE) {
5779 switch (off) {
8a31db56
JF		 5780 case bpf_ctx_range(struct __sk_buff, tc_index):
5781 case bpf_ctx_range(struct __sk_buff, priority):
5782 break;
5783 default:
5784 return false;
5785 }
5786 }
5787
b005fd18 5788 switch (off) {
f7e9cb1e 5789 case bpf_ctx_range(struct __sk_buff, mark):
8a31db56 5790 return false;
b005fd18
JF		 5791 case bpf_ctx_range(struct __sk_buff, data):
5792 info->reg_type = PTR_TO_PACKET;
5793 break;
5794 case bpf_ctx_range(struct __sk_buff, data_end):
5795 info->reg_type = PTR_TO_PACKET_END;
5796 break;
5797 }
5798
5e43f899 5799 return bpf_skb_is_valid_access(off, size, type, prog, info);
b005fd18
JF		 5800}
5801
4f738adb
JF		 5802static bool sk_msg_is_valid_access(int off, int size,
5803 enum bpf_access_type type,
5e43f899 5804 const struct bpf_prog *prog,
4f738adb
JF		 5805 struct bpf_insn_access_aux *info)
5806{
5807 if (type == BPF_WRITE)
5808 return false;
5809
5810 switch (off) {
5811 case offsetof(struct sk_msg_md, data):
5812 info->reg_type = PTR_TO_PACKET;
303def35
JF		 5813 if (size != sizeof(__u64))
5814 return false;
4f738adb
JF		 5815 break;
5816 case offsetof(struct sk_msg_md, data_end):
5817 info->reg_type = PTR_TO_PACKET_END;
303def35
JF		 5818 if (size != sizeof(__u64))
5819 return false;
4f738adb 5820 break;
303def35
JF		 5821 default:
5822 if (size != sizeof(__u32))
5823 return false;
4f738adb
JF		 5824 }
5825
5826 if (off < 0 || off >= sizeof(struct sk_msg_md))
5827 return false;
5828 if (off % size != 0)
5829 return false;
4f738adb
JF		 5830
5831 return true;
5832}
5833
d58e468b
PP		 5834static bool flow_dissector_is_valid_access(int off, int size,
5835 enum bpf_access_type type,
5836 const struct bpf_prog *prog,
5837 struct bpf_insn_access_aux *info)
5838{
5839 if (type == BPF_WRITE) {
5840 switch (off) {
5841 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
5842 break;
5843 default:
5844 return false;
5845 }
5846 }
5847
5848 switch (off) {
5849 case bpf_ctx_range(struct __sk_buff, data):
5850 info->reg_type = PTR_TO_PACKET;
5851 break;
5852 case bpf_ctx_range(struct __sk_buff, data_end):
5853 info->reg_type = PTR_TO_PACKET_END;
5854 break;
5855 case bpf_ctx_range(struct __sk_buff, flow_keys):
5856 info->reg_type = PTR_TO_FLOW_KEYS;
5857 break;
5858 case bpf_ctx_range(struct __sk_buff, tc_classid):
5859 case bpf_ctx_range(struct __sk_buff, data_meta):
5860 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
5861 return false;
5862 }
5863
5864 return bpf_skb_is_valid_access(off, size, type, prog, info);
5865}
5866
2492d3b8
DB		 5867static u32 bpf_convert_ctx_access(enum bpf_access_type type,
5868 const struct bpf_insn *si,
5869 struct bpf_insn *insn_buf,
f96da094 5870 struct bpf_prog *prog, u32 *target_size)
9bac3d6d
AS		 5871{
5872 struct bpf_insn *insn = insn_buf;
6b8cc1d1 5873 int off;
9bac3d6d 5874
6b8cc1d1 5875 switch (si->off) {
9bac3d6d 5876 case offsetof(struct __sk_buff, len):
6b8cc1d1 5877 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5878 bpf_target_off(struct sk_buff, len, 4,
5879 target_size));
9bac3d6d
AS		 5880 break;
5881
0b8c707d 5882 case offsetof(struct __sk_buff, protocol):
6b8cc1d1 5883 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5884 bpf_target_off(struct sk_buff, protocol, 2,
5885 target_size));
0b8c707d
DB		 5886 break;
5887
27cd5452 5888 case offsetof(struct __sk_buff, vlan_proto):
6b8cc1d1 5889 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 5890 bpf_target_off(struct sk_buff, vlan_proto, 2,
5891 target_size));
27cd5452
MS		 5892 break;
5893
bcad5718 5894 case offsetof(struct __sk_buff, priority):
754f1e6a 5895 if (type == BPF_WRITE)
6b8cc1d1 5896 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5897 bpf_target_off(struct sk_buff, priority, 4,
5898 target_size));
754f1e6a 5899 else
6b8cc1d1 5900 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5901 bpf_target_off(struct sk_buff, priority, 4,
5902 target_size));
bcad5718
DB		 5903 break;
5904
37e82c2f 5905 case offsetof(struct __sk_buff, ingress_ifindex):
6b8cc1d1 5906 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5907 bpf_target_off(struct sk_buff, skb_iif, 4,
5908 target_size));
37e82c2f
AS		 5909 break;
5910
5911 case offsetof(struct __sk_buff, ifindex):
f035a515 5912 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 5913 si->dst_reg, si->src_reg,
37e82c2f 5914 offsetof(struct sk_buff, dev));
6b8cc1d1
DB		 5915 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
5916 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 5917 bpf_target_off(struct net_device, ifindex, 4,
5918 target_size));
37e82c2f
AS		 5919 break;
5920
ba7591d8 5921 case offsetof(struct __sk_buff, hash):
6b8cc1d1 5922 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5923 bpf_target_off(struct sk_buff, hash, 4,
5924 target_size));
ba7591d8
DB		 5925 break;
5926
9bac3d6d 5927 case offsetof(struct __sk_buff, mark):
d691f9e8 5928 if (type == BPF_WRITE)
6b8cc1d1 5929 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5930 bpf_target_off(struct sk_buff, mark, 4,
5931 target_size));
d691f9e8 5932 else
6b8cc1d1 5933 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 5934 bpf_target_off(struct sk_buff, mark, 4,
5935 target_size));
d691f9e8 5936 break;
9bac3d6d
AS		 5937
5938 case offsetof(struct __sk_buff, pkt_type):
f96da094
DB		 5939 *target_size = 1;
5940 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
5941 PKT_TYPE_OFFSET());
5942 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
5943#ifdef __BIG_ENDIAN_BITFIELD
5944 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
5945#endif
5946 break;
9bac3d6d
AS		 5947
5948 case offsetof(struct __sk_buff, queue_mapping):
f96da094
DB		 5949 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
5950 bpf_target_off(struct sk_buff, queue_mapping, 2,
5951 target_size));
5952 break;
c2497395 5953
c2497395 5954 case offsetof(struct __sk_buff, vlan_present):
c2497395 5955 case offsetof(struct __sk_buff, vlan_tci):
f96da094
DB		 5956 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
5957
5958 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
5959 bpf_target_off(struct sk_buff, vlan_tci, 2,
5960 target_size));
5961 if (si->off == offsetof(struct __sk_buff, vlan_tci)) {
5962 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg,
5963 ~VLAN_TAG_PRESENT);
5964 } else {
5965 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12);
5966 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
5967 }
5968 break;
d691f9e8
AS		 5969
5970 case offsetof(struct __sk_buff, cb[0]) ...
f96da094 5971 offsetofend(struct __sk_buff, cb[4]) - 1:
d691f9e8 5972 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20);
62c7989b
DB		 5973 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
5974 offsetof(struct qdisc_skb_cb, data)) %
5975 sizeof(__u64));
d691f9e8 5976
ff936a04 5977 prog->cb_access = 1;
6b8cc1d1
DB		 5978 off = si->off;
5979 off -= offsetof(struct __sk_buff, cb[0]);
5980 off += offsetof(struct sk_buff, cb);
5981 off += offsetof(struct qdisc_skb_cb, data);
d691f9e8 5982 if (type == BPF_WRITE)
62c7989b 5983 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 5984 si->src_reg, off);
d691f9e8 5985 else
62c7989b 5986 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 5987 si->src_reg, off);
d691f9e8
AS		 5988 break;
5989
045efa82 5990 case offsetof(struct __sk_buff, tc_classid):
6b8cc1d1
DB		 5991 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2);
5992
5993 off = si->off;
5994 off -= offsetof(struct __sk_buff, tc_classid);
5995 off += offsetof(struct sk_buff, cb);
5996 off += offsetof(struct qdisc_skb_cb, tc_classid);
f96da094 5997 *target_size = 2;
09c37a2c 5998 if (type == BPF_WRITE)
6b8cc1d1
DB		 5999 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
6000 si->src_reg, off);
09c37a2c 6001 else
6b8cc1d1
DB		 6002 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
6003 si->src_reg, off);
045efa82
DB		 6004 break;
6005
db58ba45 6006 case offsetof(struct __sk_buff, data):
f035a515 6007 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
6b8cc1d1 6008 si->dst_reg, si->src_reg,
db58ba45
AS		 6009 offsetof(struct sk_buff, data));
6010 break;
6011
de8f3a83
DB		 6012 case offsetof(struct __sk_buff, data_meta):
6013 off = si->off;
6014 off -= offsetof(struct __sk_buff, data_meta);
6015 off += offsetof(struct sk_buff, cb);
6016 off += offsetof(struct bpf_skb_data_end, data_meta);
6017 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
6018 si->src_reg, off);
6019 break;
6020
db58ba45 6021 case offsetof(struct __sk_buff, data_end):
6b8cc1d1
DB		 6022 off = si->off;
6023 off -= offsetof(struct __sk_buff, data_end);
6024 off += offsetof(struct sk_buff, cb);
6025 off += offsetof(struct bpf_skb_data_end, data_end);
6026 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
6027 si->src_reg, off);
db58ba45
AS		 6028 break;
6029
d691f9e8
AS		 6030 case offsetof(struct __sk_buff, tc_index):
6031#ifdef CONFIG_NET_SCHED
d691f9e8 6032 if (type == BPF_WRITE)
6b8cc1d1 6033 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 6034 bpf_target_off(struct sk_buff, tc_index, 2,
6035 target_size));
d691f9e8 6036 else
6b8cc1d1 6037 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 6038 bpf_target_off(struct sk_buff, tc_index, 2,
6039 target_size));
d691f9e8 6040#else
2ed46ce4 6041 *target_size = 2;
d691f9e8 6042 if (type == BPF_WRITE)
6b8cc1d1 6043 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
d691f9e8 6044 else
6b8cc1d1 6045 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
b1d9fc41
DB		 6046#endif
6047 break;
6048
6049 case offsetof(struct __sk_buff, napi_id):
6050#if defined(CONFIG_NET_RX_BUSY_POLL)
b1d9fc41 6051 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 6052 bpf_target_off(struct sk_buff, napi_id, 4,
6053 target_size));
b1d9fc41
DB		 6054 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
6055 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
6056#else
2ed46ce4 6057 *target_size = 4;
b1d9fc41 6058 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
d691f9e8 6059#endif
6b8cc1d1 6060 break;
8a31db56
JF		 6061 case offsetof(struct __sk_buff, family):
6062 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
6063
6064 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6065 si->dst_reg, si->src_reg,
6066 offsetof(struct sk_buff, sk));
6067 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6068 bpf_target_off(struct sock_common,
6069 skc_family,
6070 2, target_size));
6071 break;
6072 case offsetof(struct __sk_buff, remote_ip4):
6073 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
6074
6075 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6076 si->dst_reg, si->src_reg,
6077 offsetof(struct sk_buff, sk));
6078 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6079 bpf_target_off(struct sock_common,
6080 skc_daddr,
6081 4, target_size));
6082 break;
6083 case offsetof(struct __sk_buff, local_ip4):
6084 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6085 skc_rcv_saddr) != 4);
6086
6087 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6088 si->dst_reg, si->src_reg,
6089 offsetof(struct sk_buff, sk));
6090 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6091 bpf_target_off(struct sock_common,
6092 skc_rcv_saddr,
6093 4, target_size));
6094 break;
6095 case offsetof(struct __sk_buff, remote_ip6[0]) ...
6096 offsetof(struct __sk_buff, remote_ip6[3]):
6097#if IS_ENABLED(CONFIG_IPV6)
6098 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6099 skc_v6_daddr.s6_addr32[0]) != 4);
6100
6101 off = si->off;
6102 off -= offsetof(struct __sk_buff, remote_ip6[0]);
6103
6104 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6105 si->dst_reg, si->src_reg,
6106 offsetof(struct sk_buff, sk));
6107 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6108 offsetof(struct sock_common,
6109 skc_v6_daddr.s6_addr32[0]) +
6110 off);
6111#else
6112 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6113#endif
6114 break;
6115 case offsetof(struct __sk_buff, local_ip6[0]) ...
6116 offsetof(struct __sk_buff, local_ip6[3]):
6117#if IS_ENABLED(CONFIG_IPV6)
6118 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6119 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
6120
6121 off = si->off;
6122 off -= offsetof(struct __sk_buff, local_ip6[0]);
6123
6124 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6125 si->dst_reg, si->src_reg,
6126 offsetof(struct sk_buff, sk));
6127 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6128 offsetof(struct sock_common,
6129 skc_v6_rcv_saddr.s6_addr32[0]) +
6130 off);
6131#else
6132 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6133#endif
6134 break;
6135
6136 case offsetof(struct __sk_buff, remote_port):
6137 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6138
6139 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6140 si->dst_reg, si->src_reg,
6141 offsetof(struct sk_buff, sk));
6142 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6143 bpf_target_off(struct sock_common,
6144 skc_dport,
6145 2, target_size));
6146#ifndef __BIG_ENDIAN_BITFIELD
6147 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6148#endif
6149 break;
6150
6151 case offsetof(struct __sk_buff, local_port):
6152 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6153
6154 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
6155 si->dst_reg, si->src_reg,
6156 offsetof(struct sk_buff, sk));
6157 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6158 bpf_target_off(struct sock_common,
6159 skc_num, 2, target_size));
6160 break;
d58e468b
PP		 6161
6162 case offsetof(struct __sk_buff, flow_keys):
6163 off = si->off;
6164 off -= offsetof(struct __sk_buff, flow_keys);
6165 off += offsetof(struct sk_buff, cb);
6166 off += offsetof(struct qdisc_skb_cb, flow_keys);
6167 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
6168 si->src_reg, off);
6169 break;
9bac3d6d
AS		 6170 }
6171
6172 return insn - insn_buf;
89aa0758
AS		 6173}
6174
c64b7983
JS		 6175u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
6176 const struct bpf_insn *si,
6177 struct bpf_insn *insn_buf,
6178 struct bpf_prog *prog, u32 *target_size)
61023658
DA		 6179{
6180 struct bpf_insn *insn = insn_buf;
aac3fc32 6181 int off;
61023658 6182
6b8cc1d1 6183 switch (si->off) {
61023658
DA		 6184 case offsetof(struct bpf_sock, bound_dev_if):
6185 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4);
6186
6187 if (type == BPF_WRITE)
6b8cc1d1 6188 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 6189 offsetof(struct sock, sk_bound_dev_if));
6190 else
6b8cc1d1 6191 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 6192 offsetof(struct sock, sk_bound_dev_if));
6193 break;
aa4c1037 6194
482dca93
DA		 6195 case offsetof(struct bpf_sock, mark):
6196 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4);
6197
6198 if (type == BPF_WRITE)
6199 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6200 offsetof(struct sock, sk_mark));
6201 else
6202 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6203 offsetof(struct sock, sk_mark));
6204 break;
6205
6206 case offsetof(struct bpf_sock, priority):
6207 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
6208
6209 if (type == BPF_WRITE)
6210 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6211 offsetof(struct sock, sk_priority));
6212 else
6213 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6214 offsetof(struct sock, sk_priority));
6215 break;
6216
aa4c1037
DA		 6217 case offsetof(struct bpf_sock, family):
6218 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2);
6219
6b8cc1d1 6220 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
aa4c1037
DA		 6221 offsetof(struct sock, sk_family));
6222 break;
6223
6224 case offsetof(struct bpf_sock, type):
6b8cc1d1 6225 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 6226 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 6227 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
6228 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
aa4c1037
DA		 6229 break;
6230
6231 case offsetof(struct bpf_sock, protocol):
6b8cc1d1 6232 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 6233 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 6234 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
6235 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT);
aa4c1037 6236 break;
aac3fc32
AI		 6237
6238 case offsetof(struct bpf_sock, src_ip4):
6239 *insn++ = BPF_LDX_MEM(
6240 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
6241 bpf_target_off(struct sock_common, skc_rcv_saddr,
6242 FIELD_SIZEOF(struct sock_common,
6243 skc_rcv_saddr),
6244 target_size));
6245 break;
6246
6247 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
6248#if IS_ENABLED(CONFIG_IPV6)
6249 off = si->off;
6250 off -= offsetof(struct bpf_sock, src_ip6[0]);
6251 *insn++ = BPF_LDX_MEM(
6252 BPF_SIZE(si->code), si->dst_reg, si->src_reg,
6253 bpf_target_off(
6254 struct sock_common,
6255 skc_v6_rcv_saddr.s6_addr32[0],
6256 FIELD_SIZEOF(struct sock_common,
6257 skc_v6_rcv_saddr.s6_addr32[0]),
6258 target_size) + off);
6259#else
6260 (void)off;
6261 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6262#endif
6263 break;
6264
6265 case offsetof(struct bpf_sock, src_port):
6266 *insn++ = BPF_LDX_MEM(
6267 BPF_FIELD_SIZEOF(struct sock_common, skc_num),
6268 si->dst_reg, si->src_reg,
6269 bpf_target_off(struct sock_common, skc_num,
6270 FIELD_SIZEOF(struct sock_common,
6271 skc_num),
6272 target_size));
6273 break;
61023658
DA		 6274 }
6275
6276 return insn - insn_buf;
6277}
6278
6b8cc1d1
DB		 6279static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
6280 const struct bpf_insn *si,
374fb54e 6281 struct bpf_insn *insn_buf,
f96da094 6282 struct bpf_prog *prog, u32 *target_size)
374fb54e
DB		 6283{
6284 struct bpf_insn *insn = insn_buf;
6285
6b8cc1d1 6286 switch (si->off) {
374fb54e 6287 case offsetof(struct __sk_buff, ifindex):
374fb54e 6288 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 6289 si->dst_reg, si->src_reg,
374fb54e 6290 offsetof(struct sk_buff, dev));
6b8cc1d1 6291 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 6292 bpf_target_off(struct net_device, ifindex, 4,
6293 target_size));
374fb54e
DB		 6294 break;
6295 default:
f96da094
DB		 6296 return bpf_convert_ctx_access(type, si, insn_buf, prog,
6297 target_size);
374fb54e
DB		 6298 }
6299
6300 return insn - insn_buf;
6301}
6302
6b8cc1d1
DB		 6303static u32 xdp_convert_ctx_access(enum bpf_access_type type,
6304 const struct bpf_insn *si,
6a773a15 6305 struct bpf_insn *insn_buf,
f96da094 6306 struct bpf_prog *prog, u32 *target_size)
6a773a15
BB		 6307{
6308 struct bpf_insn *insn = insn_buf;
6309
6b8cc1d1 6310 switch (si->off) {
6a773a15 6311 case offsetof(struct xdp_md, data):
f035a515 6312 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
6b8cc1d1 6313 si->dst_reg, si->src_reg,
6a773a15
BB		 6314 offsetof(struct xdp_buff, data));
6315 break;
de8f3a83
DB		 6316 case offsetof(struct xdp_md, data_meta):
6317 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
6318 si->dst_reg, si->src_reg,
6319 offsetof(struct xdp_buff, data_meta));
6320 break;
6a773a15 6321 case offsetof(struct xdp_md, data_end):
f035a515 6322 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
6b8cc1d1 6323 si->dst_reg, si->src_reg,
6a773a15
BB		 6324 offsetof(struct xdp_buff, data_end));
6325 break;
02dd3291
JDB		 6326 case offsetof(struct xdp_md, ingress_ifindex):
6327 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
6328 si->dst_reg, si->src_reg,
6329 offsetof(struct xdp_buff, rxq));
6330 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
6331 si->dst_reg, si->dst_reg,
6332 offsetof(struct xdp_rxq_info, dev));
6333 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6 6334 offsetof(struct net_device, ifindex));
02dd3291
JDB		 6335 break;
6336 case offsetof(struct xdp_md, rx_queue_index):
6337 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
6338 si->dst_reg, si->src_reg,
6339 offsetof(struct xdp_buff, rxq));
6340 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6
JDB		 6341 offsetof(struct xdp_rxq_info,
6342 queue_index));
02dd3291 6343 break;
6a773a15
BB		 6344 }
6345
6346 return insn - insn_buf;
6347}
6348
4fbac77d
AI		 6349/* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
6350 * context Structure, F is Field in context structure that contains a pointer
6351 * to Nested Structure of type NS that has the field NF.
6352 *
6353 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
6354 * sure that SIZE is not greater than actual size of S.F.NF.
6355 *
6356 * If offset OFF is provided, the load happens from that offset relative to
6357 * offset of NF.
6358 */
6359#define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \
6360 do { \
6361 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \
6362 si->src_reg, offsetof(S, F)); \
6363 *insn++ = BPF_LDX_MEM( \
6364 SIZE, si->dst_reg, si->dst_reg, \
6365 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6366 target_size) \
6367 + OFF); \
6368 } while (0)
6369
6370#define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \
6371 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \
6372 BPF_FIELD_SIZEOF(NS, NF), 0)
6373
6374/* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
6375 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
6376 *
6377 * It doesn't support SIZE argument though since narrow stores are not
6378 * supported for now.
6379 *
6380 * In addition it uses Temporary Field TF (member of struct S) as the 3rd
6381 * "register" since two registers available in convert_ctx_access are not
6382 * enough: we can't override neither SRC, since it contains value to store, nor
6383 * DST since it contains pointer to context that may be used by later
6384 * instructions. But we need a temporary place to save pointer to nested
6385 * structure whose field we want to store to.
6386 */
6387#define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, TF) \
6388 do { \
6389 int tmp_reg = BPF_REG_9; \
6390 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6391 --tmp_reg; \
6392 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \
6393 --tmp_reg; \
6394 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \
6395 offsetof(S, TF)); \
6396 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \
6397 si->dst_reg, offsetof(S, F)); \
6398 *insn++ = BPF_STX_MEM( \
6399 BPF_FIELD_SIZEOF(NS, NF), tmp_reg, si->src_reg, \
6400 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \
6401 target_size) \
6402 + OFF); \
6403 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \
6404 offsetof(S, TF)); \
6405 } while (0)
6406
6407#define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
6408 TF) \
6409 do { \
6410 if (type == BPF_WRITE) { \
6411 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, OFF, \
6412 TF); \
6413 } else { \
6414 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \
6415 S, NS, F, NF, SIZE, OFF); \
6416 } \
6417 } while (0)
6418
6419#define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \
6420 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \
6421 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
6422
6423static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
6424 const struct bpf_insn *si,
6425 struct bpf_insn *insn_buf,
6426 struct bpf_prog *prog, u32 *target_size)
6427{
6428 struct bpf_insn *insn = insn_buf;
6429 int off;
6430
6431 switch (si->off) {
6432 case offsetof(struct bpf_sock_addr, user_family):
6433 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
6434 struct sockaddr, uaddr, sa_family);
6435 break;
6436
6437 case offsetof(struct bpf_sock_addr, user_ip4):
6438 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6439 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
6440 sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
6441 break;
6442
6443 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
6444 off = si->off;
6445 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
6446 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6447 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
6448 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
6449 tmp_reg);
6450 break;
6451
6452 case offsetof(struct bpf_sock_addr, user_port):
6453 /* To get port we need to know sa_family first and then treat
6454 * sockaddr as either sockaddr_in or sockaddr_in6.
6455 * Though we can simplify since port field has same offset and
6456 * size in both structures.
6457 * Here we check this invariant and use just one of the
6458 * structures if it's true.
6459 */
6460 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
6461 offsetof(struct sockaddr_in6, sin6_port));
6462 BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) !=
6463 FIELD_SIZEOF(struct sockaddr_in6, sin6_port));
6464 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern,
6465 struct sockaddr_in6, uaddr,
6466 sin6_port, tmp_reg);
6467 break;
6468
6469 case offsetof(struct bpf_sock_addr, family):
6470 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
6471 struct sock, sk, sk_family);
6472 break;
6473
6474 case offsetof(struct bpf_sock_addr, type):
6475 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
6476 struct bpf_sock_addr_kern, struct sock, sk,
6477 __sk_flags_offset, BPF_W, 0);
6478 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
6479 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
6480 break;
6481
6482 case offsetof(struct bpf_sock_addr, protocol):
6483 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(
6484 struct bpf_sock_addr_kern, struct sock, sk,
6485 __sk_flags_offset, BPF_W, 0);
6486 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
6487 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg,
6488 SK_FL_PROTO_SHIFT);
6489 break;
1cedee13
AI		 6490
6491 case offsetof(struct bpf_sock_addr, msg_src_ip4):
6492 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
6493 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6494 struct bpf_sock_addr_kern, struct in_addr, t_ctx,
6495 s_addr, BPF_SIZE(si->code), 0, tmp_reg);
6496 break;
6497
6498 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
6499 msg_src_ip6[3]):
6500 off = si->off;
6501 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
6502 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
6503 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
6504 struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
6505 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
6506 break;
4fbac77d
AI		 6507 }
6508
6509 return insn - insn_buf;
6510}
6511
40304b2a
LB		 6512static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
6513 const struct bpf_insn *si,
6514 struct bpf_insn *insn_buf,
f96da094
DB		 6515 struct bpf_prog *prog,
6516 u32 *target_size)
40304b2a
LB		 6517{
6518 struct bpf_insn *insn = insn_buf;
6519 int off;
6520
6521 switch (si->off) {
6522 case offsetof(struct bpf_sock_ops, op) ...
6523 offsetof(struct bpf_sock_ops, replylong[3]):
6524 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
6525 FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
6526 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
6527 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
6528 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
6529 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
6530 off = si->off;
6531 off -= offsetof(struct bpf_sock_ops, op);
6532 off += offsetof(struct bpf_sock_ops_kern, op);
6533 if (type == BPF_WRITE)
6534 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
6535 off);
6536 else
6537 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6538 off);
6539 break;
6540
6541 case offsetof(struct bpf_sock_ops, family):
6542 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
6543
6544 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6545 struct bpf_sock_ops_kern, sk),
6546 si->dst_reg, si->src_reg,
6547 offsetof(struct bpf_sock_ops_kern, sk));
6548 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6549 offsetof(struct sock_common, skc_family));
6550 break;
6551
6552 case offsetof(struct bpf_sock_ops, remote_ip4):
6553 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
6554
6555 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6556 struct bpf_sock_ops_kern, sk),
6557 si->dst_reg, si->src_reg,
6558 offsetof(struct bpf_sock_ops_kern, sk));
6559 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6560 offsetof(struct sock_common, skc_daddr));
6561 break;
6562
6563 case offsetof(struct bpf_sock_ops, local_ip4):
303def35
JF		 6564 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6565 skc_rcv_saddr) != 4);
40304b2a
LB		 6566
6567 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6568 struct bpf_sock_ops_kern, sk),
6569 si->dst_reg, si->src_reg,
6570 offsetof(struct bpf_sock_ops_kern, sk));
6571 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6572 offsetof(struct sock_common,
6573 skc_rcv_saddr));
6574 break;
6575
6576 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
6577 offsetof(struct bpf_sock_ops, remote_ip6[3]):
6578#if IS_ENABLED(CONFIG_IPV6)
6579 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6580 skc_v6_daddr.s6_addr32[0]) != 4);
6581
6582 off = si->off;
6583 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
6584 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6585 struct bpf_sock_ops_kern, sk),
6586 si->dst_reg, si->src_reg,
6587 offsetof(struct bpf_sock_ops_kern, sk));
6588 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6589 offsetof(struct sock_common,
6590 skc_v6_daddr.s6_addr32[0]) +
6591 off);
6592#else
6593 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6594#endif
6595 break;
6596
6597 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
6598 offsetof(struct bpf_sock_ops, local_ip6[3]):
6599#if IS_ENABLED(CONFIG_IPV6)
6600 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6601 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
6602
6603 off = si->off;
6604 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
6605 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6606 struct bpf_sock_ops_kern, sk),
6607 si->dst_reg, si->src_reg,
6608 offsetof(struct bpf_sock_ops_kern, sk));
6609 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6610 offsetof(struct sock_common,
6611 skc_v6_rcv_saddr.s6_addr32[0]) +
6612 off);
6613#else
6614 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6615#endif
6616 break;
6617
6618 case offsetof(struct bpf_sock_ops, remote_port):
6619 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6620
6621 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6622 struct bpf_sock_ops_kern, sk),
6623 si->dst_reg, si->src_reg,
6624 offsetof(struct bpf_sock_ops_kern, sk));
6625 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6626 offsetof(struct sock_common, skc_dport));
6627#ifndef __BIG_ENDIAN_BITFIELD
6628 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6629#endif
6630 break;
6631
6632 case offsetof(struct bpf_sock_ops, local_port):
6633 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6634
6635 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6636 struct bpf_sock_ops_kern, sk),
6637 si->dst_reg, si->src_reg,
6638 offsetof(struct bpf_sock_ops_kern, sk));
6639 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6640 offsetof(struct sock_common, skc_num));
6641 break;
f19397a5
LB		 6642
6643 case offsetof(struct bpf_sock_ops, is_fullsock):
6644 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6645 struct bpf_sock_ops_kern,
6646 is_fullsock),
6647 si->dst_reg, si->src_reg,
6648 offsetof(struct bpf_sock_ops_kern,
6649 is_fullsock));
6650 break;
6651
44f0e430
LB		 6652 case offsetof(struct bpf_sock_ops, state):
6653 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1);
6654
6655 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6656 struct bpf_sock_ops_kern, sk),
6657 si->dst_reg, si->src_reg,
6658 offsetof(struct bpf_sock_ops_kern, sk));
6659 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
6660 offsetof(struct sock_common, skc_state));
6661 break;
6662
6663 case offsetof(struct bpf_sock_ops, rtt_min):
6664 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) !=
6665 sizeof(struct minmax));
6666 BUILD_BUG_ON(sizeof(struct minmax) <
6667 sizeof(struct minmax_sample));
6668
6669 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
6670 struct bpf_sock_ops_kern, sk),
6671 si->dst_reg, si->src_reg,
6672 offsetof(struct bpf_sock_ops_kern, sk));
6673 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6674 offsetof(struct tcp_sock, rtt_min) +
6675 FIELD_SIZEOF(struct minmax_sample, t));
6676 break;
6677
34d367c5
LB		 6678/* Helper macro for adding read access to tcp_sock or sock fields. */
6679#define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
f19397a5 6680 do { \
34d367c5
LB		 6681 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
6682 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
f19397a5
LB		 6683 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6684 struct bpf_sock_ops_kern, \
6685 is_fullsock), \
6686 si->dst_reg, si->src_reg, \
6687 offsetof(struct bpf_sock_ops_kern, \
6688 is_fullsock)); \
6689 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
6690 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6691 struct bpf_sock_ops_kern, sk),\
6692 si->dst_reg, si->src_reg, \
6693 offsetof(struct bpf_sock_ops_kern, sk));\
34d367c5
LB		 6694 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
6695 OBJ_FIELD), \
6696 si->dst_reg, si->dst_reg, \
6697 offsetof(OBJ, OBJ_FIELD)); \
f19397a5
LB		 6698 } while (0)
6699
b73042b8
LB		 6700/* Helper macro for adding write access to tcp_sock or sock fields.
6701 * The macro is called with two registers, dst_reg which contains a pointer
6702 * to ctx (context) and src_reg which contains the value that should be
6703 * stored. However, we need an additional register since we cannot overwrite
6704 * dst_reg because it may be used later in the program.
6705 * Instead we "borrow" one of the other register. We first save its value
6706 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
6707 * it at the end of the macro.
6708 */
6709#define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
6710 do { \
6711 int reg = BPF_REG_9; \
6712 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
6713 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
6714 if (si->dst_reg == reg || si->src_reg == reg) \
6715 reg--; \
6716 if (si->dst_reg == reg || si->src_reg == reg) \
6717 reg--; \
6718 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
6719 offsetof(struct bpf_sock_ops_kern, \
6720 temp)); \
6721 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6722 struct bpf_sock_ops_kern, \
6723 is_fullsock), \
6724 reg, si->dst_reg, \
6725 offsetof(struct bpf_sock_ops_kern, \
6726 is_fullsock)); \
6727 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
6728 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
6729 struct bpf_sock_ops_kern, sk),\
6730 reg, si->dst_reg, \
6731 offsetof(struct bpf_sock_ops_kern, sk));\
6732 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
6733 reg, si->src_reg, \
6734 offsetof(OBJ, OBJ_FIELD)); \
6735 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
6736 offsetof(struct bpf_sock_ops_kern, \
6737 temp)); \
6738 } while (0)
6739
6740#define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
6741 do { \
6742 if (TYPE == BPF_WRITE) \
6743 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
6744 else \
6745 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
6746 } while (0)
6747
f19397a5 6748 case offsetof(struct bpf_sock_ops, snd_cwnd):
34d367c5 6749 SOCK_OPS_GET_FIELD(snd_cwnd, snd_cwnd, struct tcp_sock);
f19397a5
LB		 6750 break;
6751
6752 case offsetof(struct bpf_sock_ops, srtt_us):
34d367c5 6753 SOCK_OPS_GET_FIELD(srtt_us, srtt_us, struct tcp_sock);
f19397a5 6754 break;
b13d8807
LB		 6755
6756 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
6757 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
6758 struct tcp_sock);
6759 break;
44f0e430
LB		 6760
6761 case offsetof(struct bpf_sock_ops, snd_ssthresh):
6762 SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock);
6763 break;
6764
6765 case offsetof(struct bpf_sock_ops, rcv_nxt):
6766 SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock);
6767 break;
6768
6769 case offsetof(struct bpf_sock_ops, snd_nxt):
6770 SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock);
6771 break;
6772
6773 case offsetof(struct bpf_sock_ops, snd_una):
6774 SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock);
6775 break;
6776
6777 case offsetof(struct bpf_sock_ops, mss_cache):
6778 SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock);
6779 break;
6780
6781 case offsetof(struct bpf_sock_ops, ecn_flags):
6782 SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock);
6783 break;
6784
6785 case offsetof(struct bpf_sock_ops, rate_delivered):
6786 SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered,
6787 struct tcp_sock);
6788 break;
6789
6790 case offsetof(struct bpf_sock_ops, rate_interval_us):
6791 SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us,
6792 struct tcp_sock);
6793 break;
6794
6795 case offsetof(struct bpf_sock_ops, packets_out):
6796 SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock);
6797 break;
6798
6799 case offsetof(struct bpf_sock_ops, retrans_out):
6800 SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock);
6801 break;
6802
6803 case offsetof(struct bpf_sock_ops, total_retrans):
6804 SOCK_OPS_GET_FIELD(total_retrans, total_retrans,
6805 struct tcp_sock);
6806 break;
6807
6808 case offsetof(struct bpf_sock_ops, segs_in):
6809 SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock);
6810 break;
6811
6812 case offsetof(struct bpf_sock_ops, data_segs_in):
6813 SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock);
6814 break;
6815
6816 case offsetof(struct bpf_sock_ops, segs_out):
6817 SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock);
6818 break;
6819
6820 case offsetof(struct bpf_sock_ops, data_segs_out):
6821 SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out,
6822 struct tcp_sock);
6823 break;
6824
6825 case offsetof(struct bpf_sock_ops, lost_out):
6826 SOCK_OPS_GET_FIELD(lost_out, lost_out, struct tcp_sock);
6827 break;
6828
6829 case offsetof(struct bpf_sock_ops, sacked_out):
6830 SOCK_OPS_GET_FIELD(sacked_out, sacked_out, struct tcp_sock);
6831 break;
6832
6833 case offsetof(struct bpf_sock_ops, sk_txhash):
6f9bd3d7
LB		 6834 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
6835 struct sock, type);
44f0e430
LB		 6836 break;
6837
6838 case offsetof(struct bpf_sock_ops, bytes_received):
6839 SOCK_OPS_GET_FIELD(bytes_received, bytes_received,
6840 struct tcp_sock);
6841 break;
6842
6843 case offsetof(struct bpf_sock_ops, bytes_acked):
6844 SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock);
6845 break;
6f9bd3d7 6846
40304b2a
LB		 6847 }
6848 return insn - insn_buf;
6849}
6850
8108a775
JF		 6851static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
6852 const struct bpf_insn *si,
6853 struct bpf_insn *insn_buf,
6854 struct bpf_prog *prog, u32 *target_size)
6855{
6856 struct bpf_insn *insn = insn_buf;
6857 int off;
6858
6859 switch (si->off) {
6860 case offsetof(struct __sk_buff, data_end):
6861 off = si->off;
6862 off -= offsetof(struct __sk_buff, data_end);
6863 off += offsetof(struct sk_buff, cb);
6864 off += offsetof(struct tcp_skb_cb, bpf.data_end);
6865 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
6866 si->src_reg, off);
6867 break;
6868 default:
6869 return bpf_convert_ctx_access(type, si, insn_buf, prog,
6870 target_size);
6871 }
6872
6873 return insn - insn_buf;
6874}
6875
4f738adb
JF		 6876static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
6877 const struct bpf_insn *si,
6878 struct bpf_insn *insn_buf,
6879 struct bpf_prog *prog, u32 *target_size)
6880{
6881 struct bpf_insn *insn = insn_buf;
720e7f38 6882#if IS_ENABLED(CONFIG_IPV6)
303def35 6883 int off;
720e7f38 6884#endif
4f738adb
JF		 6885
6886 switch (si->off) {
6887 case offsetof(struct sk_msg_md, data):
604326b4 6888 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data),
4f738adb 6889 si->dst_reg, si->src_reg,
604326b4 6890 offsetof(struct sk_msg, data));
4f738adb
JF		 6891 break;
6892 case offsetof(struct sk_msg_md, data_end):
604326b4 6893 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end),
4f738adb 6894 si->dst_reg, si->src_reg,
604326b4 6895 offsetof(struct sk_msg, data_end));
4f738adb 6896 break;
303def35
JF		 6897 case offsetof(struct sk_msg_md, family):
6898 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
6899
6900 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6901 struct sk_msg, sk),
303def35 6902 si->dst_reg, si->src_reg,
604326b4 6903 offsetof(struct sk_msg, sk));
303def35
JF		 6904 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6905 offsetof(struct sock_common, skc_family));
6906 break;
6907
6908 case offsetof(struct sk_msg_md, remote_ip4):
6909 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
6910
6911 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6912 struct sk_msg, sk),
303def35 6913 si->dst_reg, si->src_reg,
604326b4 6914 offsetof(struct sk_msg, sk));
303def35
JF		 6915 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6916 offsetof(struct sock_common, skc_daddr));
6917 break;
6918
6919 case offsetof(struct sk_msg_md, local_ip4):
6920 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6921 skc_rcv_saddr) != 4);
6922
6923 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6924 struct sk_msg, sk),
303def35 6925 si->dst_reg, si->src_reg,
604326b4 6926 offsetof(struct sk_msg, sk));
303def35
JF		 6927 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6928 offsetof(struct sock_common,
6929 skc_rcv_saddr));
6930 break;
6931
6932 case offsetof(struct sk_msg_md, remote_ip6[0]) ...
6933 offsetof(struct sk_msg_md, remote_ip6[3]):
6934#if IS_ENABLED(CONFIG_IPV6)
6935 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6936 skc_v6_daddr.s6_addr32[0]) != 4);
6937
6938 off = si->off;
6939 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
6940 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6941 struct sk_msg, sk),
303def35 6942 si->dst_reg, si->src_reg,
604326b4 6943 offsetof(struct sk_msg, sk));
303def35
JF		 6944 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6945 offsetof(struct sock_common,
6946 skc_v6_daddr.s6_addr32[0]) +
6947 off);
6948#else
6949 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6950#endif
6951 break;
6952
6953 case offsetof(struct sk_msg_md, local_ip6[0]) ...
6954 offsetof(struct sk_msg_md, local_ip6[3]):
6955#if IS_ENABLED(CONFIG_IPV6)
6956 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
6957 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
6958
6959 off = si->off;
6960 off -= offsetof(struct sk_msg_md, local_ip6[0]);
6961 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6962 struct sk_msg, sk),
303def35 6963 si->dst_reg, si->src_reg,
604326b4 6964 offsetof(struct sk_msg, sk));
303def35
JF		 6965 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
6966 offsetof(struct sock_common,
6967 skc_v6_rcv_saddr.s6_addr32[0]) +
6968 off);
6969#else
6970 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
6971#endif
6972 break;
6973
6974 case offsetof(struct sk_msg_md, remote_port):
6975 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
6976
6977 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6978 struct sk_msg, sk),
303def35 6979 si->dst_reg, si->src_reg,
604326b4 6980 offsetof(struct sk_msg, sk));
303def35
JF		 6981 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6982 offsetof(struct sock_common, skc_dport));
6983#ifndef __BIG_ENDIAN_BITFIELD
6984 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
6985#endif
6986 break;
6987
6988 case offsetof(struct sk_msg_md, local_port):
6989 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
6990
6991 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
604326b4 6992 struct sk_msg, sk),
303def35 6993 si->dst_reg, si->src_reg,
604326b4 6994 offsetof(struct sk_msg, sk));
303def35
JF		 6995 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
6996 offsetof(struct sock_common, skc_num));
6997 break;
4f738adb
JF		 6998 }
6999
7000 return insn - insn_buf;
7001}
7002
7de16e3a 7003const struct bpf_verifier_ops sk_filter_verifier_ops = {
4936e352
DB		 7004 .get_func_proto = sk_filter_func_proto,
7005 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 7006 .convert_ctx_access = bpf_convert_ctx_access,
e0cea7ce 7007 .gen_ld_abs = bpf_gen_ld_abs,
89aa0758
AS		 7008};
7009
7de16e3a 7010const struct bpf_prog_ops sk_filter_prog_ops = {
61f3c964 7011 .test_run = bpf_prog_test_run_skb,
7de16e3a
JK		 7012};
7013
7014const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
4936e352
DB		 7015 .get_func_proto = tc_cls_act_func_proto,
7016 .is_valid_access = tc_cls_act_is_valid_access,
374fb54e 7017 .convert_ctx_access = tc_cls_act_convert_ctx_access,
36bbef52 7018 .gen_prologue = tc_cls_act_prologue,
e0cea7ce 7019 .gen_ld_abs = bpf_gen_ld_abs,
7de16e3a
JK		 7020};
7021
7022const struct bpf_prog_ops tc_cls_act_prog_ops = {
1cf1cae9 7023 .test_run = bpf_prog_test_run_skb,
608cd71a
AS		 7024};
7025
7de16e3a 7026const struct bpf_verifier_ops xdp_verifier_ops = {
6a773a15
BB		 7027 .get_func_proto = xdp_func_proto,
7028 .is_valid_access = xdp_is_valid_access,
7029 .convert_ctx_access = xdp_convert_ctx_access,
7de16e3a
JK		 7030};
7031
7032const struct bpf_prog_ops xdp_prog_ops = {
1cf1cae9 7033 .test_run = bpf_prog_test_run_xdp,
6a773a15
BB		 7034};
7035
7de16e3a 7036const struct bpf_verifier_ops cg_skb_verifier_ops = {
cd339431 7037 .get_func_proto = cg_skb_func_proto,
0e33661d 7038 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 7039 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 7040};
7041
7042const struct bpf_prog_ops cg_skb_prog_ops = {
1cf1cae9 7043 .test_run = bpf_prog_test_run_skb,
0e33661d
DM		 7044};
7045
cd3092c7
MX		 7046const struct bpf_verifier_ops lwt_in_verifier_ops = {
7047 .get_func_proto = lwt_in_func_proto,
3a0af8fd 7048 .is_valid_access = lwt_is_valid_access,
2492d3b8 7049 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 7050};
7051
cd3092c7
MX		 7052const struct bpf_prog_ops lwt_in_prog_ops = {
7053 .test_run = bpf_prog_test_run_skb,
7054};
7055
7056const struct bpf_verifier_ops lwt_out_verifier_ops = {
7057 .get_func_proto = lwt_out_func_proto,
3a0af8fd 7058 .is_valid_access = lwt_is_valid_access,
2492d3b8 7059 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 7060};
7061
cd3092c7 7062const struct bpf_prog_ops lwt_out_prog_ops = {
1cf1cae9 7063 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 7064};
7065
7de16e3a 7066const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
3a0af8fd
TG		 7067 .get_func_proto = lwt_xmit_func_proto,
7068 .is_valid_access = lwt_is_valid_access,
2492d3b8 7069 .convert_ctx_access = bpf_convert_ctx_access,
3a0af8fd 7070 .gen_prologue = tc_cls_act_prologue,
7de16e3a
JK		 7071};
7072
7073const struct bpf_prog_ops lwt_xmit_prog_ops = {
1cf1cae9 7074 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 7075};
7076
004d4b27
MX		 7077const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
7078 .get_func_proto = lwt_seg6local_func_proto,
7079 .is_valid_access = lwt_is_valid_access,
7080 .convert_ctx_access = bpf_convert_ctx_access,
7081};
7082
7083const struct bpf_prog_ops lwt_seg6local_prog_ops = {
7084 .test_run = bpf_prog_test_run_skb,
7085};
7086
7de16e3a 7087const struct bpf_verifier_ops cg_sock_verifier_ops = {
ae2cf1c4 7088 .get_func_proto = sock_filter_func_proto,
61023658 7089 .is_valid_access = sock_filter_is_valid_access,
c64b7983 7090 .convert_ctx_access = bpf_sock_convert_ctx_access,
61023658
DA		 7091};
7092
7de16e3a
JK		 7093const struct bpf_prog_ops cg_sock_prog_ops = {
7094};
7095
4fbac77d
AI		 7096const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
7097 .get_func_proto = sock_addr_func_proto,
7098 .is_valid_access = sock_addr_is_valid_access,
7099 .convert_ctx_access = sock_addr_convert_ctx_access,
7100};
7101
7102const struct bpf_prog_ops cg_sock_addr_prog_ops = {
7103};
7104
7de16e3a 7105const struct bpf_verifier_ops sock_ops_verifier_ops = {
8c4b4c7e 7106 .get_func_proto = sock_ops_func_proto,
40304b2a
LB		 7107 .is_valid_access = sock_ops_is_valid_access,
7108 .convert_ctx_access = sock_ops_convert_ctx_access,
7109};
7110
7de16e3a
JK		 7111const struct bpf_prog_ops sock_ops_prog_ops = {
7112};
7113
7114const struct bpf_verifier_ops sk_skb_verifier_ops = {
b005fd18
JF		 7115 .get_func_proto = sk_skb_func_proto,
7116 .is_valid_access = sk_skb_is_valid_access,
8108a775 7117 .convert_ctx_access = sk_skb_convert_ctx_access,
8a31db56 7118 .gen_prologue = sk_skb_prologue,
b005fd18
JF		 7119};
7120
7de16e3a
JK		 7121const struct bpf_prog_ops sk_skb_prog_ops = {
7122};
7123
4f738adb
JF		 7124const struct bpf_verifier_ops sk_msg_verifier_ops = {
7125 .get_func_proto = sk_msg_func_proto,
7126 .is_valid_access = sk_msg_is_valid_access,
7127 .convert_ctx_access = sk_msg_convert_ctx_access,
7128};
7129
7130const struct bpf_prog_ops sk_msg_prog_ops = {
7131};
7132
d58e468b
PP		 7133const struct bpf_verifier_ops flow_dissector_verifier_ops = {
7134 .get_func_proto = flow_dissector_func_proto,
7135 .is_valid_access = flow_dissector_is_valid_access,
7136 .convert_ctx_access = bpf_convert_ctx_access,
7137};
7138
7139const struct bpf_prog_ops flow_dissector_prog_ops = {
7140};
7141
8ced425e 7142int sk_detach_filter(struct sock *sk)
55b33325
PE		 7143{
7144 int ret = -ENOENT;
7145 struct sk_filter *filter;
7146
d59577b6
VB		 7147 if (sock_flag(sk, SOCK_FILTER_LOCKED))
7148 return -EPERM;
7149
8ced425e
HFS		 7150 filter = rcu_dereference_protected(sk->sk_filter,
7151 lockdep_sock_is_held(sk));
55b33325 7152 if (filter) {
a9b3cd7f 7153 RCU_INIT_POINTER(sk->sk_filter, NULL);
46bcf14f 7154 sk_filter_uncharge(sk, filter);
55b33325
PE		 7155 ret = 0;
7156 }
a3ea269b 7157
55b33325
PE		 7158 return ret;
7159}
8ced425e 7160EXPORT_SYMBOL_GPL(sk_detach_filter);
a8fc9277 7161
a3ea269b
DB		 7162int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
7163 unsigned int len)
a8fc9277 7164{
a3ea269b 7165 struct sock_fprog_kern *fprog;
a8fc9277 7166 struct sk_filter *filter;
a3ea269b 7167 int ret = 0;
a8fc9277
PE		 7168
7169 lock_sock(sk);
7170 filter = rcu_dereference_protected(sk->sk_filter,
8ced425e 7171 lockdep_sock_is_held(sk));
a8fc9277
PE		 7172 if (!filter)
7173 goto out;
a3ea269b
DB		 7174
7175 /* We're copying the filter that has been originally attached,
93d08b69
DB		 7176 * so no conversion/decode needed anymore. eBPF programs that
7177 * have no original program cannot be dumped through this.
a3ea269b 7178 */
93d08b69 7179 ret = -EACCES;
7ae457c1 7180 fprog = filter->prog->orig_prog;
93d08b69
DB		 7181 if (!fprog)
7182 goto out;
a3ea269b
DB		 7183
7184 ret = fprog->len;
a8fc9277 7185 if (!len)
a3ea269b 7186 /* User space only enquires number of filter blocks. */
a8fc9277 7187 goto out;
a3ea269b 7188
a8fc9277 7189 ret = -EINVAL;
a3ea269b 7190 if (len < fprog->len)
a8fc9277
PE		 7191 goto out;
7192
7193 ret = -EFAULT;
009937e7 7194 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
a3ea269b 7195 goto out;
a8fc9277 7196
a3ea269b
DB		 7197 /* Instead of bytes, the API requests to return the number
7198 * of filter blocks.
7199 */
7200 ret = fprog->len;
a8fc9277
PE		 7201out:
7202 release_sock(sk);
7203 return ret;
7204}
2dbb9b9e
MKL		 7205
7206#ifdef CONFIG_INET
7207struct sk_reuseport_kern {
7208 struct sk_buff *skb;
7209 struct sock *sk;
7210 struct sock *selected_sk;
7211 void *data_end;
7212 u32 hash;
7213 u32 reuseport_id;
7214 bool bind_inany;
7215};
7216
7217static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
7218 struct sock_reuseport *reuse,
7219 struct sock *sk, struct sk_buff *skb,
7220 u32 hash)
7221{
7222 reuse_kern->skb = skb;
7223 reuse_kern->sk = sk;
7224 reuse_kern->selected_sk = NULL;
7225 reuse_kern->data_end = skb->data + skb_headlen(skb);
7226 reuse_kern->hash = hash;
7227 reuse_kern->reuseport_id = reuse->reuseport_id;
7228 reuse_kern->bind_inany = reuse->bind_inany;
7229}
7230
7231struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
7232 struct bpf_prog *prog, struct sk_buff *skb,
7233 u32 hash)
7234{
7235 struct sk_reuseport_kern reuse_kern;
7236 enum sk_action action;
7237
7238 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash);
7239 action = BPF_PROG_RUN(prog, &reuse_kern);
7240
7241 if (action == SK_PASS)
7242 return reuse_kern.selected_sk;
7243 else
7244 return ERR_PTR(-ECONNREFUSED);
7245}
7246
7247BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
7248 struct bpf_map *, map, void *, key, u32, flags)
7249{
7250 struct sock_reuseport *reuse;
7251 struct sock *selected_sk;
7252
7253 selected_sk = map->ops->map_lookup_elem(map, key);
7254 if (!selected_sk)
7255 return -ENOENT;
7256
7257 reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
7258 if (!reuse)
7259 /* selected_sk is unhashed (e.g. by close()) after the
7260 * above map_lookup_elem(). Treat selected_sk has already
7261 * been removed from the map.
7262 */
7263 return -ENOENT;
7264
7265 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
7266 struct sock *sk;
7267
7268 if (unlikely(!reuse_kern->reuseport_id))
7269 /* There is a small race between adding the
7270 * sk to the map and setting the
7271 * reuse_kern->reuseport_id.
7272 * Treat it as the sk has not been added to
7273 * the bpf map yet.
7274 */
7275 return -ENOENT;
7276
7277 sk = reuse_kern->sk;
7278 if (sk->sk_protocol != selected_sk->sk_protocol)
7279 return -EPROTOTYPE;
7280 else if (sk->sk_family != selected_sk->sk_family)
7281 return -EAFNOSUPPORT;
7282
7283 /* Catch all. Likely bound to a different sockaddr. */
7284 return -EBADFD;
7285 }
7286
7287 reuse_kern->selected_sk = selected_sk;
7288
7289 return 0;
7290}
7291
7292static const struct bpf_func_proto sk_select_reuseport_proto = {
7293 .func = sk_select_reuseport,
7294 .gpl_only = false,
7295 .ret_type = RET_INTEGER,
7296 .arg1_type = ARG_PTR_TO_CTX,
7297 .arg2_type = ARG_CONST_MAP_PTR,
7298 .arg3_type = ARG_PTR_TO_MAP_KEY,
7299 .arg4_type = ARG_ANYTHING,
7300};
7301
7302BPF_CALL_4(sk_reuseport_load_bytes,
7303 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
7304 void *, to, u32, len)
7305{
7306 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
7307}
7308
7309static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
7310 .func = sk_reuseport_load_bytes,
7311 .gpl_only = false,
7312 .ret_type = RET_INTEGER,
7313 .arg1_type = ARG_PTR_TO_CTX,
7314 .arg2_type = ARG_ANYTHING,
7315 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
7316 .arg4_type = ARG_CONST_SIZE,
7317};
7318
7319BPF_CALL_5(sk_reuseport_load_bytes_relative,
7320 const struct sk_reuseport_kern *, reuse_kern, u32, offset,
7321 void *, to, u32, len, u32, start_header)
7322{
7323 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
7324 len, start_header);
7325}
7326
7327static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
7328 .func = sk_reuseport_load_bytes_relative,
7329 .gpl_only = false,
7330 .ret_type = RET_INTEGER,
7331 .arg1_type = ARG_PTR_TO_CTX,
7332 .arg2_type = ARG_ANYTHING,
7333 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
7334 .arg4_type = ARG_CONST_SIZE,
7335 .arg5_type = ARG_ANYTHING,
7336};
7337
7338static const struct bpf_func_proto *
7339sk_reuseport_func_proto(enum bpf_func_id func_id,
7340 const struct bpf_prog *prog)
7341{
7342 switch (func_id) {
7343 case BPF_FUNC_sk_select_reuseport:
7344 return &sk_select_reuseport_proto;
7345 case BPF_FUNC_skb_load_bytes:
7346 return &sk_reuseport_load_bytes_proto;
7347 case BPF_FUNC_skb_load_bytes_relative:
7348 return &sk_reuseport_load_bytes_relative_proto;
7349 default:
7350 return bpf_base_func_proto(func_id);
7351 }
7352}
7353
7354static bool
7355sk_reuseport_is_valid_access(int off, int size,
7356 enum bpf_access_type type,
7357 const struct bpf_prog *prog,
7358 struct bpf_insn_access_aux *info)
7359{
7360 const u32 size_default = sizeof(__u32);
7361
7362 if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
7363 off % size || type != BPF_READ)
7364 return false;
7365
7366 switch (off) {
7367 case offsetof(struct sk_reuseport_md, data):
7368 info->reg_type = PTR_TO_PACKET;
7369 return size == sizeof(__u64);
7370
7371 case offsetof(struct sk_reuseport_md, data_end):
7372 info->reg_type = PTR_TO_PACKET_END;
7373 return size == sizeof(__u64);
7374
7375 case offsetof(struct sk_reuseport_md, hash):
7376 return size == size_default;
7377
7378 /* Fields that allow narrowing */
7379 case offsetof(struct sk_reuseport_md, eth_protocol):
7380 if (size < FIELD_SIZEOF(struct sk_buff, protocol))
7381 return false;
4597b62f 7382 /* fall through */
2dbb9b9e
MKL		 7383 case offsetof(struct sk_reuseport_md, ip_protocol):
7384 case offsetof(struct sk_reuseport_md, bind_inany):
7385 case offsetof(struct sk_reuseport_md, len):
7386 bpf_ctx_record_field_size(info, size_default);
7387 return bpf_ctx_narrow_access_ok(off, size, size_default);
7388
7389 default:
7390 return false;
7391 }
7392}
7393
7394#define SK_REUSEPORT_LOAD_FIELD(F) ({ \
7395 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7396 si->dst_reg, si->src_reg, \
7397 bpf_target_off(struct sk_reuseport_kern, F, \
7398 FIELD_SIZEOF(struct sk_reuseport_kern, F), \
7399 target_size)); \
7400 })
7401
7402#define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \
7403 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \
7404 struct sk_buff, \
7405 skb, \
7406 SKB_FIELD)
7407
7408#define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \
7409 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \
7410 struct sock, \
7411 sk, \
7412 SK_FIELD, BPF_SIZE, EXTRA_OFF)
7413
7414static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
7415 const struct bpf_insn *si,
7416 struct bpf_insn *insn_buf,
7417 struct bpf_prog *prog,
7418 u32 *target_size)
7419{
7420 struct bpf_insn *insn = insn_buf;
7421
7422 switch (si->off) {
7423 case offsetof(struct sk_reuseport_md, data):
7424 SK_REUSEPORT_LOAD_SKB_FIELD(data);
7425 break;
7426
7427 case offsetof(struct sk_reuseport_md, len):
7428 SK_REUSEPORT_LOAD_SKB_FIELD(len);
7429 break;
7430
7431 case offsetof(struct sk_reuseport_md, eth_protocol):
7432 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
7433 break;
7434
7435 case offsetof(struct sk_reuseport_md, ip_protocol):
3f6e138d 7436 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE);
2dbb9b9e
MKL		 7437 SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset,
7438 BPF_W, 0);
7439 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
7440 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg,
7441 SK_FL_PROTO_SHIFT);
7442 /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian
7443 * aware. No further narrowing or masking is needed.
7444 */
7445 *target_size = 1;
7446 break;
7447
7448 case offsetof(struct sk_reuseport_md, data_end):
7449 SK_REUSEPORT_LOAD_FIELD(data_end);
7450 break;
7451
7452 case offsetof(struct sk_reuseport_md, hash):
7453 SK_REUSEPORT_LOAD_FIELD(hash);
7454 break;
7455
7456 case offsetof(struct sk_reuseport_md, bind_inany):
7457 SK_REUSEPORT_LOAD_FIELD(bind_inany);
7458 break;
7459 }
7460
7461 return insn - insn_buf;
7462}
7463
7464const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
7465 .get_func_proto = sk_reuseport_func_proto,
7466 .is_valid_access = sk_reuseport_is_valid_access,
7467 .convert_ctx_access = sk_reuseport_convert_ctx_access,
7468};
7469
7470const struct bpf_prog_ops sk_reuseport_prog_ops = {
7471};
7472#endif /* CONFIG_INET */
Linux 6.x block layer and io_uring tree(s)