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bpf: fix subprog verifier bypass by div/mod by 0 exception
[linux-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>
1da177e4
LT		 36#include <net/ip.h>
37#include <net/protocol.h>
4738c1db 38#include <net/netlink.h>
1da177e4
LT		 39#include <linux/skbuff.h>
40#include <net/sock.h>
10b89ee4 41#include <net/flow_dissector.h>
1da177e4
LT		 42#include <linux/errno.h>
43#include <linux/timer.h>
7c0f6ba6 44#include <linux/uaccess.h>
40daafc8 45#include <asm/unaligned.h>
d66f2b91 46#include <asm/cmpxchg.h>
1da177e4 47#include <linux/filter.h>
86e4ca66 48#include <linux/ratelimit.h>
46b325c7 49#include <linux/seccomp.h>
f3335031 50#include <linux/if_vlan.h>
89aa0758 51#include <linux/bpf.h>
d691f9e8 52#include <net/sch_generic.h>
8d20aabe 53#include <net/cls_cgroup.h>
d3aa45ce 54#include <net/dst_metadata.h>
c46646d0 55#include <net/dst.h>
538950a1 56#include <net/sock_reuseport.h>
b1d9fc41 57#include <net/busy_poll.h>
8c4b4c7e 58#include <net/tcp.h>
5acaee0a 59#include <linux/bpf_trace.h>
1da177e4 60
43db6d65 61/**
f4979fce 62 * sk_filter_trim_cap - run a packet through a socket filter
43db6d65
SH		 63 * @sk: sock associated with &sk_buff
64 * @skb: buffer to filter
f4979fce 65 * @cap: limit on how short the eBPF program may trim the packet
43db6d65 66 *
ff936a04
AS		 67 * Run the eBPF program and then cut skb->data to correct size returned by
68 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
43db6d65 69 * than pkt_len we keep whole skb->data. This is the socket level
ff936a04 70 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
43db6d65
SH		 71 * be accepted or -EPERM if the packet should be tossed.
72 *
73 */
f4979fce 74int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
43db6d65
SH		 75{
76 int err;
77 struct sk_filter *filter;
78
c93bdd0e
MG		 79 /*
80 * If the skb was allocated from pfmemalloc reserves, only
81 * allow SOCK_MEMALLOC sockets to use it as this socket is
82 * helping free memory
83 */
8fe809a9
ED		 84 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
85 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
c93bdd0e 86 return -ENOMEM;
8fe809a9 87 }
c11cd3a6
DM		 88 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
89 if (err)
90 return err;
91
43db6d65
SH		 92 err = security_sock_rcv_skb(sk, skb);
93 if (err)
94 return err;
95
80f8f102
ED		 96 rcu_read_lock();
97 filter = rcu_dereference(sk->sk_filter);
43db6d65 98 if (filter) {
8f917bba
WB		 99 struct sock *save_sk = skb->sk;
100 unsigned int pkt_len;
101
102 skb->sk = sk;
103 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
8f917bba 104 skb->sk = save_sk;
d1f496fd 105 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
43db6d65 106 }
80f8f102 107 rcu_read_unlock();
43db6d65
SH		 108
109 return err;
110}
f4979fce 111EXPORT_SYMBOL(sk_filter_trim_cap);
43db6d65 112
f3694e00 113BPF_CALL_1(__skb_get_pay_offset, struct sk_buff *, skb)
bd4cf0ed 114{
f3694e00 115 return skb_get_poff(skb);
bd4cf0ed
AS		 116}
117
f3694e00 118BPF_CALL_3(__skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
bd4cf0ed 119{
bd4cf0ed
AS		 120 struct nlattr *nla;
121
122 if (skb_is_nonlinear(skb))
123 return 0;
124
05ab8f26
MK		 125 if (skb->len < sizeof(struct nlattr))
126 return 0;
127
30743837 128 if (a > skb->len - sizeof(struct nlattr))
bd4cf0ed
AS		 129 return 0;
130
30743837 131 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
bd4cf0ed
AS		 132 if (nla)
133 return (void *) nla - (void *) skb->data;
134
135 return 0;
136}
137
f3694e00 138BPF_CALL_3(__skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
bd4cf0ed 139{
bd4cf0ed
AS		 140 struct nlattr *nla;
141
142 if (skb_is_nonlinear(skb))
143 return 0;
144
05ab8f26
MK		 145 if (skb->len < sizeof(struct nlattr))
146 return 0;
147
30743837 148 if (a > skb->len - sizeof(struct nlattr))
bd4cf0ed
AS		 149 return 0;
150
30743837
DB		 151 nla = (struct nlattr *) &skb->data[a];
152 if (nla->nla_len > skb->len - a)
bd4cf0ed
AS		 153 return 0;
154
30743837 155 nla = nla_find_nested(nla, x);
bd4cf0ed
AS		 156 if (nla)
157 return (void *) nla - (void *) skb->data;
158
159 return 0;
160}
161
f3694e00 162BPF_CALL_0(__get_raw_cpu_id)
bd4cf0ed
AS		 163{
164 return raw_smp_processor_id();
165}
166
80b48c44
DB		 167static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
168 .func = __get_raw_cpu_id,
169 .gpl_only = false,
170 .ret_type = RET_INTEGER,
171};
172
9bac3d6d
AS		 173static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
174 struct bpf_insn *insn_buf)
175{
176 struct bpf_insn *insn = insn_buf;
177
178 switch (skb_field) {
179 case SKF_AD_MARK:
180 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4);
181
182 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
183 offsetof(struct sk_buff, mark));
184 break;
185
186 case SKF_AD_PKTTYPE:
187 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
188 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
189#ifdef __BIG_ENDIAN_BITFIELD
190 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
191#endif
192 break;
193
194 case SKF_AD_QUEUE:
195 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2);
196
197 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
198 offsetof(struct sk_buff, queue_mapping));
199 break;
c2497395 200
c2497395
AS		 201 case SKF_AD_VLAN_TAG:
202 case SKF_AD_VLAN_TAG_PRESENT:
203 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
204 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
205
206 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
207 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
208 offsetof(struct sk_buff, vlan_tci));
209 if (skb_field == SKF_AD_VLAN_TAG) {
210 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg,
211 ~VLAN_TAG_PRESENT);
212 } else {
213 /* dst_reg >>= 12 */
214 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 12);
215 /* dst_reg &= 1 */
216 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
217 }
218 break;
9bac3d6d
AS		 219 }
220
221 return insn - insn_buf;
222}
223
bd4cf0ed 224static bool convert_bpf_extensions(struct sock_filter *fp,
2695fb55 225 struct bpf_insn **insnp)
bd4cf0ed 226{
2695fb55 227 struct bpf_insn *insn = *insnp;
9bac3d6d 228 u32 cnt;
bd4cf0ed
AS		 229
230 switch (fp->k) {
231 case SKF_AD_OFF + SKF_AD_PROTOCOL:
0b8c707d
DB		 232 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2);
233
234 /* A = *(u16 *) (CTX + offsetof(protocol)) */
235 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
236 offsetof(struct sk_buff, protocol));
237 /* A = ntohs(A) [emitting a nop or swap16] */
238 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
bd4cf0ed
AS		 239 break;
240
241 case SKF_AD_OFF + SKF_AD_PKTTYPE:
9bac3d6d
AS		 242 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
243 insn += cnt - 1;
bd4cf0ed
AS		 244 break;
245
246 case SKF_AD_OFF + SKF_AD_IFINDEX:
247 case SKF_AD_OFF + SKF_AD_HATYPE:
bd4cf0ed
AS		 248 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4);
249 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2);
f8f6d679 250
f035a515 251 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
f8f6d679
DB		 252 BPF_REG_TMP, BPF_REG_CTX,
253 offsetof(struct sk_buff, dev));
254 /* if (tmp != 0) goto pc + 1 */
255 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
256 *insn++ = BPF_EXIT_INSN();
257 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
258 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
259 offsetof(struct net_device, ifindex));
260 else
261 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
262 offsetof(struct net_device, type));
bd4cf0ed
AS		 263 break;
264
265 case SKF_AD_OFF + SKF_AD_MARK:
9bac3d6d
AS		 266 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
267 insn += cnt - 1;
bd4cf0ed
AS		 268 break;
269
270 case SKF_AD_OFF + SKF_AD_RXHASH:
271 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4);
272
9739eef1
AS		 273 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
274 offsetof(struct sk_buff, hash));
bd4cf0ed
AS		 275 break;
276
277 case SKF_AD_OFF + SKF_AD_QUEUE:
9bac3d6d
AS		 278 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
279 insn += cnt - 1;
bd4cf0ed
AS		 280 break;
281
282 case SKF_AD_OFF + SKF_AD_VLAN_TAG:
c2497395
AS		 283 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
284 BPF_REG_A, BPF_REG_CTX, insn);
285 insn += cnt - 1;
286 break;
bd4cf0ed 287
c2497395
AS		 288 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
289 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
290 BPF_REG_A, BPF_REG_CTX, insn);
291 insn += cnt - 1;
bd4cf0ed
AS		 292 break;
293
27cd5452
MS		 294 case SKF_AD_OFF + SKF_AD_VLAN_TPID:
295 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2);
296
297 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
298 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
299 offsetof(struct sk_buff, vlan_proto));
300 /* A = ntohs(A) [emitting a nop or swap16] */
301 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
302 break;
303
bd4cf0ed
AS		 304 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
305 case SKF_AD_OFF + SKF_AD_NLATTR:
306 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
307 case SKF_AD_OFF + SKF_AD_CPU:
4cd3675e 308 case SKF_AD_OFF + SKF_AD_RANDOM:
e430f34e 309 /* arg1 = CTX */
f8f6d679 310 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
bd4cf0ed 311 /* arg2 = A */
f8f6d679 312 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
bd4cf0ed 313 /* arg3 = X */
f8f6d679 314 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
e430f34e 315 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
bd4cf0ed
AS		 316 switch (fp->k) {
317 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
f8f6d679 318 *insn = BPF_EMIT_CALL(__skb_get_pay_offset);
bd4cf0ed
AS		 319 break;
320 case SKF_AD_OFF + SKF_AD_NLATTR:
f8f6d679 321 *insn = BPF_EMIT_CALL(__skb_get_nlattr);
bd4cf0ed
AS		 322 break;
323 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
f8f6d679 324 *insn = BPF_EMIT_CALL(__skb_get_nlattr_nest);
bd4cf0ed
AS		 325 break;
326 case SKF_AD_OFF + SKF_AD_CPU:
f8f6d679 327 *insn = BPF_EMIT_CALL(__get_raw_cpu_id);
bd4cf0ed 328 break;
4cd3675e 329 case SKF_AD_OFF + SKF_AD_RANDOM:
3ad00405
DB		 330 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
331 bpf_user_rnd_init_once();
4cd3675e 332 break;
bd4cf0ed
AS		 333 }
334 break;
335
336 case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
9739eef1
AS		 337 /* A ^= X */
338 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
bd4cf0ed
AS		 339 break;
340
341 default:
342 /* This is just a dummy call to avoid letting the compiler
343 * evict __bpf_call_base() as an optimization. Placed here
344 * where no-one bothers.
345 */
346 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
347 return false;
348 }
349
350 *insnp = insn;
351 return true;
352}
353
354/**
8fb575ca 355 * bpf_convert_filter - convert filter program
bd4cf0ed
AS		 356 * @prog: the user passed filter program
357 * @len: the length of the user passed filter program
50bbfed9 358 * @new_prog: allocated 'struct bpf_prog' or NULL
bd4cf0ed
AS		 359 * @new_len: pointer to store length of converted program
360 *
1f504ec9
TK		 361 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
362 * style extended BPF (eBPF).
bd4cf0ed
AS		 363 * Conversion workflow:
364 *
365 * 1) First pass for calculating the new program length:
8fb575ca 366 * bpf_convert_filter(old_prog, old_len, NULL, &new_len)
bd4cf0ed
AS		 367 *
368 * 2) 2nd pass to remap in two passes: 1st pass finds new
369 * jump offsets, 2nd pass remapping:
8fb575ca 370 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len);
bd4cf0ed 371 */
d9e12f42 372static int bpf_convert_filter(struct sock_filter *prog, int len,
50bbfed9 373 struct bpf_prog *new_prog, int *new_len)
bd4cf0ed 374{
50bbfed9
AS		 375 int new_flen = 0, pass = 0, target, i, stack_off;
376 struct bpf_insn *new_insn, *first_insn = NULL;
bd4cf0ed
AS		 377 struct sock_filter *fp;
378 int *addrs = NULL;
379 u8 bpf_src;
380
381 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
30743837 382 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
bd4cf0ed 383
6f9a093b 384 if (len <= 0 || len > BPF_MAXINSNS)
bd4cf0ed
AS		 385 return -EINVAL;
386
387 if (new_prog) {
50bbfed9 388 first_insn = new_prog->insnsi;
658da937
DB		 389 addrs = kcalloc(len, sizeof(*addrs),
390 GFP_KERNEL | __GFP_NOWARN);
bd4cf0ed
AS		 391 if (!addrs)
392 return -ENOMEM;
393 }
394
395do_pass:
50bbfed9 396 new_insn = first_insn;
bd4cf0ed
AS		 397 fp = prog;
398
8b614aeb 399 /* Classic BPF related prologue emission. */
50bbfed9 400 if (new_prog) {
8b614aeb
DB		 401 /* Classic BPF expects A and X to be reset first. These need
402 * to be guaranteed to be the first two instructions.
403 */
1d621674
DB		 404 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
405 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
8b614aeb
DB		 406
407 /* All programs must keep CTX in callee saved BPF_REG_CTX.
408 * In eBPF case it's done by the compiler, here we need to
409 * do this ourself. Initial CTX is present in BPF_REG_ARG1.
410 */
411 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
412 } else {
413 new_insn += 3;
414 }
bd4cf0ed
AS		 415
416 for (i = 0; i < len; fp++, i++) {
2695fb55
AS		 417 struct bpf_insn tmp_insns[6] = { };
418 struct bpf_insn *insn = tmp_insns;
bd4cf0ed
AS		 419
420 if (addrs)
50bbfed9 421 addrs[i] = new_insn - first_insn;
bd4cf0ed
AS		 422
423 switch (fp->code) {
424 /* All arithmetic insns and skb loads map as-is. */
425 case BPF_ALU | BPF_ADD | BPF_X:
426 case BPF_ALU | BPF_ADD | BPF_K:
427 case BPF_ALU | BPF_SUB | BPF_X:
428 case BPF_ALU | BPF_SUB | BPF_K:
429 case BPF_ALU | BPF_AND | BPF_X:
430 case BPF_ALU | BPF_AND | BPF_K:
431 case BPF_ALU | BPF_OR | BPF_X:
432 case BPF_ALU | BPF_OR | BPF_K:
433 case BPF_ALU | BPF_LSH | BPF_X:
434 case BPF_ALU | BPF_LSH | BPF_K:
435 case BPF_ALU | BPF_RSH | BPF_X:
436 case BPF_ALU | BPF_RSH | BPF_K:
437 case BPF_ALU | BPF_XOR | BPF_X:
438 case BPF_ALU | BPF_XOR | BPF_K:
439 case BPF_ALU | BPF_MUL | BPF_X:
440 case BPF_ALU | BPF_MUL | BPF_K:
441 case BPF_ALU | BPF_DIV | BPF_X:
442 case BPF_ALU | BPF_DIV | BPF_K:
443 case BPF_ALU | BPF_MOD | BPF_X:
444 case BPF_ALU | BPF_MOD | BPF_K:
445 case BPF_ALU | BPF_NEG:
446 case BPF_LD | BPF_ABS | BPF_W:
447 case BPF_LD | BPF_ABS | BPF_H:
448 case BPF_LD | BPF_ABS | BPF_B:
449 case BPF_LD | BPF_IND | BPF_W:
450 case BPF_LD | BPF_IND | BPF_H:
451 case BPF_LD | BPF_IND | BPF_B:
452 /* Check for overloaded BPF extension and
453 * directly convert it if found, otherwise
454 * just move on with mapping.
455 */
456 if (BPF_CLASS(fp->code) == BPF_LD &&
457 BPF_MODE(fp->code) == BPF_ABS &&
458 convert_bpf_extensions(fp, &insn))
459 break;
460
68fda450 461 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
f6b1b3bf 462 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
68fda450 463 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
f6b1b3bf
DB		 464 /* Error with exception code on div/mod by 0.
465 * For cBPF programs, this was always return 0.
466 */
467 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
468 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
469 *insn++ = BPF_EXIT_INSN();
470 }
68fda450 471
f8f6d679 472 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
bd4cf0ed
AS		 473 break;
474
f8f6d679
DB		 475 /* Jump transformation cannot use BPF block macros
476 * everywhere as offset calculation and target updates
477 * require a bit more work than the rest, i.e. jump
478 * opcodes map as-is, but offsets need adjustment.
479 */
480
481#define BPF_EMIT_JMP \
bd4cf0ed
AS		 482 do { \
483 if (target >= len || target < 0) \
484 goto err; \
485 insn->off = addrs ? addrs[target] - addrs[i] - 1 : 0; \
486 /* Adjust pc relative offset for 2nd or 3rd insn. */ \
487 insn->off -= insn - tmp_insns; \
488 } while (0)
489
f8f6d679
DB		 490 case BPF_JMP | BPF_JA:
491 target = i + fp->k + 1;
492 insn->code = fp->code;
493 BPF_EMIT_JMP;
bd4cf0ed
AS		 494 break;
495
496 case BPF_JMP | BPF_JEQ | BPF_K:
497 case BPF_JMP | BPF_JEQ | BPF_X:
498 case BPF_JMP | BPF_JSET | BPF_K:
499 case BPF_JMP | BPF_JSET | BPF_X:
500 case BPF_JMP | BPF_JGT | BPF_K:
501 case BPF_JMP | BPF_JGT | BPF_X:
502 case BPF_JMP | BPF_JGE | BPF_K:
503 case BPF_JMP | BPF_JGE | BPF_X:
504 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
505 /* BPF immediates are signed, zero extend
506 * immediate into tmp register and use it
507 * in compare insn.
508 */
f8f6d679 509 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
bd4cf0ed 510
e430f34e
AS		 511 insn->dst_reg = BPF_REG_A;
512 insn->src_reg = BPF_REG_TMP;
bd4cf0ed
AS		 513 bpf_src = BPF_X;
514 } else {
e430f34e 515 insn->dst_reg = BPF_REG_A;
bd4cf0ed
AS		 516 insn->imm = fp->k;
517 bpf_src = BPF_SRC(fp->code);
19539ce7 518 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
1da177e4 519 }
bd4cf0ed
AS		 520
521 /* Common case where 'jump_false' is next insn. */
522 if (fp->jf == 0) {
523 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
524 target = i + fp->jt + 1;
f8f6d679 525 BPF_EMIT_JMP;
bd4cf0ed 526 break;
1da177e4 527 }
bd4cf0ed 528
92b31a9a
DB		 529 /* Convert some jumps when 'jump_true' is next insn. */
530 if (fp->jt == 0) {
531 switch (BPF_OP(fp->code)) {
532 case BPF_JEQ:
533 insn->code = BPF_JMP | BPF_JNE | bpf_src;
534 break;
535 case BPF_JGT:
536 insn->code = BPF_JMP | BPF_JLE | bpf_src;
537 break;
538 case BPF_JGE:
539 insn->code = BPF_JMP | BPF_JLT | bpf_src;
540 break;
541 default:
542 goto jmp_rest;
543 }
544
bd4cf0ed 545 target = i + fp->jf + 1;
f8f6d679 546 BPF_EMIT_JMP;
bd4cf0ed 547 break;
0b05b2a4 548 }
92b31a9a 549jmp_rest:
bd4cf0ed
AS		 550 /* Other jumps are mapped into two insns: Jxx and JA. */
551 target = i + fp->jt + 1;
552 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
f8f6d679 553 BPF_EMIT_JMP;
bd4cf0ed
AS		 554 insn++;
555
556 insn->code = BPF_JMP | BPF_JA;
557 target = i + fp->jf + 1;
f8f6d679 558 BPF_EMIT_JMP;
bd4cf0ed
AS		 559 break;
560
561 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
562 case BPF_LDX | BPF_MSH | BPF_B:
9739eef1 563 /* tmp = A */
f8f6d679 564 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_A);
1268e253 565 /* A = BPF_R0 = *(u8 *) (skb->data + K) */
f8f6d679 566 *insn++ = BPF_LD_ABS(BPF_B, fp->k);
9739eef1 567 /* A &= 0xf */
f8f6d679 568 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
9739eef1 569 /* A <<= 2 */
f8f6d679 570 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
9739eef1 571 /* X = A */
f8f6d679 572 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
9739eef1 573 /* A = tmp */
f8f6d679 574 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
bd4cf0ed
AS		 575 break;
576
6205b9cf
DB		 577 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
578 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
579 */
bd4cf0ed
AS		 580 case BPF_RET | BPF_A:
581 case BPF_RET | BPF_K:
6205b9cf
DB		 582 if (BPF_RVAL(fp->code) == BPF_K)
583 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
584 0, fp->k);
9739eef1 585 *insn = BPF_EXIT_INSN();
bd4cf0ed
AS		 586 break;
587
588 /* Store to stack. */
589 case BPF_ST:
590 case BPF_STX:
50bbfed9 591 stack_off = fp->k * 4 + 4;
f8f6d679
DB		 592 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
593 BPF_ST ? BPF_REG_A : BPF_REG_X,
50bbfed9
AS		 594 -stack_off);
595 /* check_load_and_stores() verifies that classic BPF can
596 * load from stack only after write, so tracking
597 * stack_depth for ST|STX insns is enough
598 */
599 if (new_prog && new_prog->aux->stack_depth < stack_off)
600 new_prog->aux->stack_depth = stack_off;
bd4cf0ed
AS		 601 break;
602
603 /* Load from stack. */
604 case BPF_LD | BPF_MEM:
605 case BPF_LDX | BPF_MEM:
50bbfed9 606 stack_off = fp->k * 4 + 4;
f8f6d679
DB		 607 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
608 BPF_REG_A : BPF_REG_X, BPF_REG_FP,
50bbfed9 609 -stack_off);
bd4cf0ed
AS		 610 break;
611
612 /* A = K or X = K */
613 case BPF_LD | BPF_IMM:
614 case BPF_LDX | BPF_IMM:
f8f6d679
DB		 615 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
616 BPF_REG_A : BPF_REG_X, fp->k);
bd4cf0ed
AS		 617 break;
618
619 /* X = A */
620 case BPF_MISC | BPF_TAX:
f8f6d679 621 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
bd4cf0ed
AS		 622 break;
623
624 /* A = X */
625 case BPF_MISC | BPF_TXA:
f8f6d679 626 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
bd4cf0ed
AS		 627 break;
628
629 /* A = skb->len or X = skb->len */
630 case BPF_LD | BPF_W | BPF_LEN:
631 case BPF_LDX | BPF_W | BPF_LEN:
f8f6d679
DB		 632 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
633 BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
634 offsetof(struct sk_buff, len));
bd4cf0ed
AS		 635 break;
636
f8f6d679 637 /* Access seccomp_data fields. */
bd4cf0ed 638 case BPF_LDX | BPF_ABS | BPF_W:
9739eef1
AS		 639 /* A = *(u32 *) (ctx + K) */
640 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
bd4cf0ed
AS		 641 break;
642
ca9f1fd2 643 /* Unknown instruction. */
1da177e4 644 default:
bd4cf0ed 645 goto err;
1da177e4 646 }
bd4cf0ed
AS		 647
648 insn++;
649 if (new_prog)
650 memcpy(new_insn, tmp_insns,
651 sizeof(*insn) * (insn - tmp_insns));
bd4cf0ed 652 new_insn += insn - tmp_insns;
1da177e4
LT		 653 }
654
bd4cf0ed
AS		 655 if (!new_prog) {
656 /* Only calculating new length. */
50bbfed9 657 *new_len = new_insn - first_insn;
bd4cf0ed
AS		 658 return 0;
659 }
660
661 pass++;
50bbfed9
AS		 662 if (new_flen != new_insn - first_insn) {
663 new_flen = new_insn - first_insn;
bd4cf0ed
AS		 664 if (pass > 2)
665 goto err;
bd4cf0ed
AS		 666 goto do_pass;
667 }
668
669 kfree(addrs);
670 BUG_ON(*new_len != new_flen);
1da177e4 671 return 0;
bd4cf0ed
AS		 672err:
673 kfree(addrs);
674 return -EINVAL;
1da177e4
LT		 675}
676
bd4cf0ed 677/* Security:
bd4cf0ed 678 *
2d5311e4 679 * As we dont want to clear mem[] array for each packet going through
8ea6e345 680 * __bpf_prog_run(), we check that filter loaded by user never try to read
2d5311e4 681 * a cell if not previously written, and we check all branches to be sure
25985edc 682 * a malicious user doesn't try to abuse us.
2d5311e4 683 */
ec31a05c 684static int check_load_and_stores(const struct sock_filter *filter, int flen)
2d5311e4 685{
34805931 686 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
2d5311e4
ED		 687 int pc, ret = 0;
688
689 BUILD_BUG_ON(BPF_MEMWORDS > 16);
34805931 690
99e72a0f 691 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
2d5311e4
ED		 692 if (!masks)
693 return -ENOMEM;
34805931 694
2d5311e4
ED		 695 memset(masks, 0xff, flen * sizeof(*masks));
696
697 for (pc = 0; pc < flen; pc++) {
698 memvalid &= masks[pc];
699
700 switch (filter[pc].code) {
34805931
DB		 701 case BPF_ST:
702 case BPF_STX:
2d5311e4
ED		 703 memvalid |= (1 << filter[pc].k);
704 break;
34805931
DB		 705 case BPF_LD | BPF_MEM:
706 case BPF_LDX | BPF_MEM:
2d5311e4
ED		 707 if (!(memvalid & (1 << filter[pc].k))) {
708 ret = -EINVAL;
709 goto error;
710 }
711 break;
34805931
DB		 712 case BPF_JMP | BPF_JA:
713 /* A jump must set masks on target */
2d5311e4
ED		 714 masks[pc + 1 + filter[pc].k] &= memvalid;
715 memvalid = ~0;
716 break;
34805931
DB		 717 case BPF_JMP | BPF_JEQ | BPF_K:
718 case BPF_JMP | BPF_JEQ | BPF_X:
719 case BPF_JMP | BPF_JGE | BPF_K:
720 case BPF_JMP | BPF_JGE | BPF_X:
721 case BPF_JMP | BPF_JGT | BPF_K:
722 case BPF_JMP | BPF_JGT | BPF_X:
723 case BPF_JMP | BPF_JSET | BPF_K:
724 case BPF_JMP | BPF_JSET | BPF_X:
725 /* A jump must set masks on targets */
2d5311e4
ED		 726 masks[pc + 1 + filter[pc].jt] &= memvalid;
727 masks[pc + 1 + filter[pc].jf] &= memvalid;
728 memvalid = ~0;
729 break;
730 }
731 }
732error:
733 kfree(masks);
734 return ret;
735}
736
34805931
DB		 737static bool chk_code_allowed(u16 code_to_probe)
738{
739 static const bool codes[] = {
740 /* 32 bit ALU operations */
741 [BPF_ALU | BPF_ADD | BPF_K] = true,
742 [BPF_ALU | BPF_ADD | BPF_X] = true,
743 [BPF_ALU | BPF_SUB | BPF_K] = true,
744 [BPF_ALU | BPF_SUB | BPF_X] = true,
745 [BPF_ALU | BPF_MUL | BPF_K] = true,
746 [BPF_ALU | BPF_MUL | BPF_X] = true,
747 [BPF_ALU | BPF_DIV | BPF_K] = true,
748 [BPF_ALU | BPF_DIV | BPF_X] = true,
749 [BPF_ALU | BPF_MOD | BPF_K] = true,
750 [BPF_ALU | BPF_MOD | BPF_X] = true,
751 [BPF_ALU | BPF_AND | BPF_K] = true,
752 [BPF_ALU | BPF_AND | BPF_X] = true,
753 [BPF_ALU | BPF_OR | BPF_K] = true,
754 [BPF_ALU | BPF_OR | BPF_X] = true,
755 [BPF_ALU | BPF_XOR | BPF_K] = true,
756 [BPF_ALU | BPF_XOR | BPF_X] = true,
757 [BPF_ALU | BPF_LSH | BPF_K] = true,
758 [BPF_ALU | BPF_LSH | BPF_X] = true,
759 [BPF_ALU | BPF_RSH | BPF_K] = true,
760 [BPF_ALU | BPF_RSH | BPF_X] = true,
761 [BPF_ALU | BPF_NEG] = true,
762 /* Load instructions */
763 [BPF_LD | BPF_W | BPF_ABS] = true,
764 [BPF_LD | BPF_H | BPF_ABS] = true,
765 [BPF_LD | BPF_B | BPF_ABS] = true,
766 [BPF_LD | BPF_W | BPF_LEN] = true,
767 [BPF_LD | BPF_W | BPF_IND] = true,
768 [BPF_LD | BPF_H | BPF_IND] = true,
769 [BPF_LD | BPF_B | BPF_IND] = true,
770 [BPF_LD | BPF_IMM] = true,
771 [BPF_LD | BPF_MEM] = true,
772 [BPF_LDX | BPF_W | BPF_LEN] = true,
773 [BPF_LDX | BPF_B | BPF_MSH] = true,
774 [BPF_LDX | BPF_IMM] = true,
775 [BPF_LDX | BPF_MEM] = true,
776 /* Store instructions */
777 [BPF_ST] = true,
778 [BPF_STX] = true,
779 /* Misc instructions */
780 [BPF_MISC | BPF_TAX] = true,
781 [BPF_MISC | BPF_TXA] = true,
782 /* Return instructions */
783 [BPF_RET | BPF_K] = true,
784 [BPF_RET | BPF_A] = true,
785 /* Jump instructions */
786 [BPF_JMP | BPF_JA] = true,
787 [BPF_JMP | BPF_JEQ | BPF_K] = true,
788 [BPF_JMP | BPF_JEQ | BPF_X] = true,
789 [BPF_JMP | BPF_JGE | BPF_K] = true,
790 [BPF_JMP | BPF_JGE | BPF_X] = true,
791 [BPF_JMP | BPF_JGT | BPF_K] = true,
792 [BPF_JMP | BPF_JGT | BPF_X] = true,
793 [BPF_JMP | BPF_JSET | BPF_K] = true,
794 [BPF_JMP | BPF_JSET | BPF_X] = true,
795 };
796
797 if (code_to_probe >= ARRAY_SIZE(codes))
798 return false;
799
800 return codes[code_to_probe];
801}
802
f7bd9e36
DB		 803static bool bpf_check_basics_ok(const struct sock_filter *filter,
804 unsigned int flen)
805{
806 if (filter == NULL)
807 return false;
808 if (flen == 0 || flen > BPF_MAXINSNS)
809 return false;
810
811 return true;
812}
813
1da177e4 814/**
4df95ff4 815 * bpf_check_classic - verify socket filter code
1da177e4
LT		 816 * @filter: filter to verify
817 * @flen: length of filter
818 *
819 * Check the user's filter code. If we let some ugly
820 * filter code slip through kaboom! The filter must contain
93699863
KK		 821 * no references or jumps that are out of range, no illegal
822 * instructions, and must end with a RET instruction.
1da177e4 823 *
7b11f69f
KK		 824 * All jumps are forward as they are not signed.
825 *
826 * Returns 0 if the rule set is legal or -EINVAL if not.
1da177e4 827 */
d9e12f42
NS		 828static int bpf_check_classic(const struct sock_filter *filter,
829 unsigned int flen)
1da177e4 830{
aa1113d9 831 bool anc_found;
34805931 832 int pc;
1da177e4 833
34805931 834 /* Check the filter code now */
1da177e4 835 for (pc = 0; pc < flen; pc++) {
ec31a05c 836 const struct sock_filter *ftest = &filter[pc];
93699863 837
34805931
DB		 838 /* May we actually operate on this code? */
839 if (!chk_code_allowed(ftest->code))
cba328fc 840 return -EINVAL;
34805931 841
93699863 842 /* Some instructions need special checks */
34805931
DB		 843 switch (ftest->code) {
844 case BPF_ALU | BPF_DIV | BPF_K:
845 case BPF_ALU | BPF_MOD | BPF_K:
846 /* Check for division by zero */
b6069a95
ED		 847 if (ftest->k == 0)
848 return -EINVAL;
849 break;
229394e8
RV		 850 case BPF_ALU | BPF_LSH | BPF_K:
851 case BPF_ALU | BPF_RSH | BPF_K:
852 if (ftest->k >= 32)
853 return -EINVAL;
854 break;
34805931
DB		 855 case BPF_LD | BPF_MEM:
856 case BPF_LDX | BPF_MEM:
857 case BPF_ST:
858 case BPF_STX:
859 /* Check for invalid memory addresses */
93699863
KK		 860 if (ftest->k >= BPF_MEMWORDS)
861 return -EINVAL;
862 break;
34805931
DB		 863 case BPF_JMP | BPF_JA:
864 /* Note, the large ftest->k might cause loops.
93699863
KK		 865 * Compare this with conditional jumps below,
866 * where offsets are limited. --ANK (981016)
867 */
34805931 868 if (ftest->k >= (unsigned int)(flen - pc - 1))
93699863 869 return -EINVAL;
01f2f3f6 870 break;
34805931
DB		 871 case BPF_JMP | BPF_JEQ | BPF_K:
872 case BPF_JMP | BPF_JEQ | BPF_X:
873 case BPF_JMP | BPF_JGE | BPF_K:
874 case BPF_JMP | BPF_JGE | BPF_X:
875 case BPF_JMP | BPF_JGT | BPF_K:
876 case BPF_JMP | BPF_JGT | BPF_X:
877 case BPF_JMP | BPF_JSET | BPF_K:
878 case BPF_JMP | BPF_JSET | BPF_X:
879 /* Both conditionals must be safe */
e35bedf3 880 if (pc + ftest->jt + 1 >= flen ||
93699863
KK		 881 pc + ftest->jf + 1 >= flen)
882 return -EINVAL;
cba328fc 883 break;
34805931
DB		 884 case BPF_LD | BPF_W | BPF_ABS:
885 case BPF_LD | BPF_H | BPF_ABS:
886 case BPF_LD | BPF_B | BPF_ABS:
aa1113d9 887 anc_found = false;
34805931
DB		 888 if (bpf_anc_helper(ftest) & BPF_ANC)
889 anc_found = true;
890 /* Ancillary operation unknown or unsupported */
aa1113d9
DB		 891 if (anc_found == false && ftest->k >= SKF_AD_OFF)
892 return -EINVAL;
01f2f3f6
HPP		 893 }
894 }
93699863 895
34805931 896 /* Last instruction must be a RET code */
01f2f3f6 897 switch (filter[flen - 1].code) {
34805931
DB		 898 case BPF_RET | BPF_K:
899 case BPF_RET | BPF_A:
2d5311e4 900 return check_load_and_stores(filter, flen);
cba328fc 901 }
34805931 902
cba328fc 903 return -EINVAL;
1da177e4
LT		 904}
905
7ae457c1
AS		 906static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
907 const struct sock_fprog *fprog)
a3ea269b 908{
009937e7 909 unsigned int fsize = bpf_classic_proglen(fprog);
a3ea269b
DB		 910 struct sock_fprog_kern *fkprog;
911
912 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
913 if (!fp->orig_prog)
914 return -ENOMEM;
915
916 fkprog = fp->orig_prog;
917 fkprog->len = fprog->len;
658da937
DB		 918
919 fkprog->filter = kmemdup(fp->insns, fsize,
920 GFP_KERNEL | __GFP_NOWARN);
a3ea269b
DB		 921 if (!fkprog->filter) {
922 kfree(fp->orig_prog);
923 return -ENOMEM;
924 }
925
926 return 0;
927}
928
7ae457c1 929static void bpf_release_orig_filter(struct bpf_prog *fp)
a3ea269b
DB		 930{
931 struct sock_fprog_kern *fprog = fp->orig_prog;
932
933 if (fprog) {
934 kfree(fprog->filter);
935 kfree(fprog);
936 }
937}
938
7ae457c1
AS		 939static void __bpf_prog_release(struct bpf_prog *prog)
940{
24701ece 941 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
89aa0758
AS		 942 bpf_prog_put(prog);
943 } else {
944 bpf_release_orig_filter(prog);
945 bpf_prog_free(prog);
946 }
7ae457c1
AS		 947}
948
34c5bd66
PN		 949static void __sk_filter_release(struct sk_filter *fp)
950{
7ae457c1
AS		 951 __bpf_prog_release(fp->prog);
952 kfree(fp);
34c5bd66
PN		 953}
954
47e958ea 955/**
46bcf14f 956 * sk_filter_release_rcu - Release a socket filter by rcu_head
47e958ea
PE		 957 * @rcu: rcu_head that contains the sk_filter to free
958 */
fbc907f0 959static void sk_filter_release_rcu(struct rcu_head *rcu)
47e958ea
PE		 960{
961 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
962
34c5bd66 963 __sk_filter_release(fp);
47e958ea 964}
fbc907f0
DB		 965
966/**
967 * sk_filter_release - release a socket filter
968 * @fp: filter to remove
969 *
970 * Remove a filter from a socket and release its resources.
971 */
972static void sk_filter_release(struct sk_filter *fp)
973{
4c355cdf 974 if (refcount_dec_and_test(&fp->refcnt))
fbc907f0
DB		 975 call_rcu(&fp->rcu, sk_filter_release_rcu);
976}
977
978void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
979{
7ae457c1 980 u32 filter_size = bpf_prog_size(fp->prog->len);
fbc907f0 981
278571ba
AS		 982 atomic_sub(filter_size, &sk->sk_omem_alloc);
983 sk_filter_release(fp);
fbc907f0 984}
47e958ea 985
278571ba
AS		 986/* try to charge the socket memory if there is space available
987 * return true on success
988 */
4c355cdf 989static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
bd4cf0ed 990{
7ae457c1 991 u32 filter_size = bpf_prog_size(fp->prog->len);
278571ba
AS		 992
993 /* same check as in sock_kmalloc() */
994 if (filter_size <= sysctl_optmem_max &&
995 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
278571ba
AS		 996 atomic_add(filter_size, &sk->sk_omem_alloc);
997 return true;
bd4cf0ed 998 }
278571ba 999 return false;
bd4cf0ed
AS		 1000}
1001
4c355cdf
RE		 1002bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1003{
eefca20e
ED		 1004 if (!refcount_inc_not_zero(&fp->refcnt))
1005 return false;
1006
1007 if (!__sk_filter_charge(sk, fp)) {
1008 sk_filter_release(fp);
1009 return false;
1010 }
1011 return true;
4c355cdf
RE		 1012}
1013
7ae457c1 1014static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
bd4cf0ed
AS		 1015{
1016 struct sock_filter *old_prog;
7ae457c1 1017 struct bpf_prog *old_fp;
34805931 1018 int err, new_len, old_len = fp->len;
bd4cf0ed
AS		 1019
1020 /* We are free to overwrite insns et al right here as it
1021 * won't be used at this point in time anymore internally
1022 * after the migration to the internal BPF instruction
1023 * representation.
1024 */
1025 BUILD_BUG_ON(sizeof(struct sock_filter) !=
2695fb55 1026 sizeof(struct bpf_insn));
bd4cf0ed 1027
bd4cf0ed
AS		 1028 /* Conversion cannot happen on overlapping memory areas,
1029 * so we need to keep the user BPF around until the 2nd
1030 * pass. At this time, the user BPF is stored in fp->insns.
1031 */
1032 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
658da937 1033 GFP_KERNEL | __GFP_NOWARN);
bd4cf0ed
AS		 1034 if (!old_prog) {
1035 err = -ENOMEM;
1036 goto out_err;
1037 }
1038
1039 /* 1st pass: calculate the new program length. */
8fb575ca 1040 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len);
bd4cf0ed
AS		 1041 if (err)
1042 goto out_err_free;
1043
1044 /* Expand fp for appending the new filter representation. */
1045 old_fp = fp;
60a3b225 1046 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
bd4cf0ed
AS		 1047 if (!fp) {
1048 /* The old_fp is still around in case we couldn't
1049 * allocate new memory, so uncharge on that one.
1050 */
1051 fp = old_fp;
1052 err = -ENOMEM;
1053 goto out_err_free;
1054 }
1055
bd4cf0ed
AS		 1056 fp->len = new_len;
1057
2695fb55 1058 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
50bbfed9 1059 err = bpf_convert_filter(old_prog, old_len, fp, &new_len);
bd4cf0ed 1060 if (err)
8fb575ca 1061 /* 2nd bpf_convert_filter() can fail only if it fails
bd4cf0ed
AS		 1062 * to allocate memory, remapping must succeed. Note,
1063 * that at this time old_fp has already been released
278571ba 1064 * by krealloc().
bd4cf0ed
AS		 1065 */
1066 goto out_err_free;
1067
d1c55ab5 1068 fp = bpf_prog_select_runtime(fp, &err);
290af866
AS		 1069 if (err)
1070 goto out_err_free;
5fe821a9 1071
bd4cf0ed
AS		 1072 kfree(old_prog);
1073 return fp;
1074
1075out_err_free:
1076 kfree(old_prog);
1077out_err:
7ae457c1 1078 __bpf_prog_release(fp);
bd4cf0ed
AS		 1079 return ERR_PTR(err);
1080}
1081
ac67eb2c
DB		 1082static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1083 bpf_aux_classic_check_t trans)
302d6637
JP		 1084{
1085 int err;
1086
bd4cf0ed 1087 fp->bpf_func = NULL;
a91263d5 1088 fp->jited = 0;
302d6637 1089
4df95ff4 1090 err = bpf_check_classic(fp->insns, fp->len);
418c96ac 1091 if (err) {
7ae457c1 1092 __bpf_prog_release(fp);
bd4cf0ed 1093 return ERR_PTR(err);
418c96ac 1094 }
302d6637 1095
4ae92bc7
NS		 1096 /* There might be additional checks and transformations
1097 * needed on classic filters, f.e. in case of seccomp.
1098 */
1099 if (trans) {
1100 err = trans(fp->insns, fp->len);
1101 if (err) {
1102 __bpf_prog_release(fp);
1103 return ERR_PTR(err);
1104 }
1105 }
1106
bd4cf0ed
AS		 1107 /* Probe if we can JIT compile the filter and if so, do
1108 * the compilation of the filter.
1109 */
302d6637 1110 bpf_jit_compile(fp);
bd4cf0ed
AS		 1111
1112 /* JIT compiler couldn't process this filter, so do the
1113 * internal BPF translation for the optimized interpreter.
1114 */
5fe821a9 1115 if (!fp->jited)
7ae457c1 1116 fp = bpf_migrate_filter(fp);
bd4cf0ed
AS		 1117
1118 return fp;
302d6637
JP		 1119}
1120
1121/**
7ae457c1 1122 * bpf_prog_create - create an unattached filter
c6c4b97c 1123 * @pfp: the unattached filter that is created
677a9fd3 1124 * @fprog: the filter program
302d6637 1125 *
c6c4b97c 1126 * Create a filter independent of any socket. We first run some
302d6637
JP		 1127 * sanity checks on it to make sure it does not explode on us later.
1128 * If an error occurs or there is insufficient memory for the filter
1129 * a negative errno code is returned. On success the return is zero.
1130 */
7ae457c1 1131int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
302d6637 1132{
009937e7 1133 unsigned int fsize = bpf_classic_proglen(fprog);
7ae457c1 1134 struct bpf_prog *fp;
302d6637
JP		 1135
1136 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1137 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
302d6637
JP		 1138 return -EINVAL;
1139
60a3b225 1140 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
302d6637
JP		 1141 if (!fp)
1142 return -ENOMEM;
a3ea269b 1143
302d6637
JP		 1144 memcpy(fp->insns, fprog->filter, fsize);
1145
302d6637 1146 fp->len = fprog->len;
a3ea269b
DB		 1147 /* Since unattached filters are not copied back to user
1148 * space through sk_get_filter(), we do not need to hold
1149 * a copy here, and can spare us the work.
1150 */
1151 fp->orig_prog = NULL;
302d6637 1152
7ae457c1 1153 /* bpf_prepare_filter() already takes care of freeing
bd4cf0ed
AS		 1154 * memory in case something goes wrong.
1155 */
4ae92bc7 1156 fp = bpf_prepare_filter(fp, NULL);
bd4cf0ed
AS		 1157 if (IS_ERR(fp))
1158 return PTR_ERR(fp);
302d6637
JP		 1159
1160 *pfp = fp;
1161 return 0;
302d6637 1162}
7ae457c1 1163EXPORT_SYMBOL_GPL(bpf_prog_create);
302d6637 1164
ac67eb2c
DB		 1165/**
1166 * bpf_prog_create_from_user - create an unattached filter from user buffer
1167 * @pfp: the unattached filter that is created
1168 * @fprog: the filter program
1169 * @trans: post-classic verifier transformation handler
bab18991 1170 * @save_orig: save classic BPF program
ac67eb2c
DB		 1171 *
1172 * This function effectively does the same as bpf_prog_create(), only
1173 * that it builds up its insns buffer from user space provided buffer.
1174 * It also allows for passing a bpf_aux_classic_check_t handler.
1175 */
1176int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
bab18991 1177 bpf_aux_classic_check_t trans, bool save_orig)
ac67eb2c
DB		 1178{
1179 unsigned int fsize = bpf_classic_proglen(fprog);
1180 struct bpf_prog *fp;
bab18991 1181 int err;
ac67eb2c
DB		 1182
1183 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1184 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
ac67eb2c
DB		 1185 return -EINVAL;
1186
1187 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1188 if (!fp)
1189 return -ENOMEM;
1190
1191 if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1192 __bpf_prog_free(fp);
1193 return -EFAULT;
1194 }
1195
1196 fp->len = fprog->len;
ac67eb2c
DB		 1197 fp->orig_prog = NULL;
1198
bab18991
DB		 1199 if (save_orig) {
1200 err = bpf_prog_store_orig_filter(fp, fprog);
1201 if (err) {
1202 __bpf_prog_free(fp);
1203 return -ENOMEM;
1204 }
1205 }
1206
ac67eb2c
DB		 1207 /* bpf_prepare_filter() already takes care of freeing
1208 * memory in case something goes wrong.
1209 */
1210 fp = bpf_prepare_filter(fp, trans);
1211 if (IS_ERR(fp))
1212 return PTR_ERR(fp);
1213
1214 *pfp = fp;
1215 return 0;
1216}
2ea273d7 1217EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
ac67eb2c 1218
7ae457c1 1219void bpf_prog_destroy(struct bpf_prog *fp)
302d6637 1220{
7ae457c1 1221 __bpf_prog_release(fp);
302d6637 1222}
7ae457c1 1223EXPORT_SYMBOL_GPL(bpf_prog_destroy);
302d6637 1224
8ced425e 1225static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
49b31e57
DB		 1226{
1227 struct sk_filter *fp, *old_fp;
1228
1229 fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1230 if (!fp)
1231 return -ENOMEM;
1232
1233 fp->prog = prog;
49b31e57 1234
4c355cdf 1235 if (!__sk_filter_charge(sk, fp)) {
49b31e57
DB		 1236 kfree(fp);
1237 return -ENOMEM;
1238 }
4c355cdf 1239 refcount_set(&fp->refcnt, 1);
49b31e57 1240
8ced425e
HFS		 1241 old_fp = rcu_dereference_protected(sk->sk_filter,
1242 lockdep_sock_is_held(sk));
49b31e57 1243 rcu_assign_pointer(sk->sk_filter, fp);
8ced425e 1244
49b31e57
DB		 1245 if (old_fp)
1246 sk_filter_uncharge(sk, old_fp);
1247
1248 return 0;
1249}
1250
538950a1
CG		 1251static int __reuseport_attach_prog(struct bpf_prog *prog, struct sock *sk)
1252{
1253 struct bpf_prog *old_prog;
1254 int err;
1255
1256 if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1257 return -ENOMEM;
1258
fa463497 1259 if (sk_unhashed(sk) && sk->sk_reuseport) {
538950a1
CG		 1260 err = reuseport_alloc(sk);
1261 if (err)
1262 return err;
1263 } else if (!rcu_access_pointer(sk->sk_reuseport_cb)) {
1264 /* The socket wasn't bound with SO_REUSEPORT */
1265 return -EINVAL;
1266 }
1267
1268 old_prog = reuseport_attach_prog(sk, prog);
1269 if (old_prog)
1270 bpf_prog_destroy(old_prog);
1271
1272 return 0;
1273}
1274
1275static
1276struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1da177e4 1277{
009937e7 1278 unsigned int fsize = bpf_classic_proglen(fprog);
7ae457c1 1279 struct bpf_prog *prog;
1da177e4
LT		 1280 int err;
1281
d59577b6 1282 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1283 return ERR_PTR(-EPERM);
d59577b6 1284
1da177e4 1285 /* Make sure new filter is there and in the right amounts. */
f7bd9e36 1286 if (!bpf_check_basics_ok(fprog->filter, fprog->len))
538950a1 1287 return ERR_PTR(-EINVAL);
1da177e4 1288
f7bd9e36 1289 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
7ae457c1 1290 if (!prog)
538950a1 1291 return ERR_PTR(-ENOMEM);
a3ea269b 1292
7ae457c1 1293 if (copy_from_user(prog->insns, fprog->filter, fsize)) {
c0d1379a 1294 __bpf_prog_free(prog);
538950a1 1295 return ERR_PTR(-EFAULT);
1da177e4
LT		 1296 }
1297
7ae457c1 1298 prog->len = fprog->len;
1da177e4 1299
7ae457c1 1300 err = bpf_prog_store_orig_filter(prog, fprog);
a3ea269b 1301 if (err) {
c0d1379a 1302 __bpf_prog_free(prog);
538950a1 1303 return ERR_PTR(-ENOMEM);
a3ea269b
DB		 1304 }
1305
7ae457c1 1306 /* bpf_prepare_filter() already takes care of freeing
bd4cf0ed
AS		 1307 * memory in case something goes wrong.
1308 */
538950a1
CG		 1309 return bpf_prepare_filter(prog, NULL);
1310}
1311
1312/**
1313 * sk_attach_filter - attach a socket filter
1314 * @fprog: the filter program
1315 * @sk: the socket to use
1316 *
1317 * Attach the user's filter code. We first run some sanity checks on
1318 * it to make sure it does not explode on us later. If an error
1319 * occurs or there is insufficient memory for the filter a negative
1320 * errno code is returned. On success the return is zero.
1321 */
8ced425e 1322int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
538950a1
CG		 1323{
1324 struct bpf_prog *prog = __get_filter(fprog, sk);
1325 int err;
1326
7ae457c1
AS		 1327 if (IS_ERR(prog))
1328 return PTR_ERR(prog);
1329
8ced425e 1330 err = __sk_attach_prog(prog, sk);
49b31e57 1331 if (err < 0) {
7ae457c1 1332 __bpf_prog_release(prog);
49b31e57 1333 return err;
278571ba
AS		 1334 }
1335
d3904b73 1336 return 0;
1da177e4 1337}
8ced425e 1338EXPORT_SYMBOL_GPL(sk_attach_filter);
1da177e4 1339
538950a1 1340int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
89aa0758 1341{
538950a1 1342 struct bpf_prog *prog = __get_filter(fprog, sk);
49b31e57 1343 int err;
89aa0758 1344
538950a1
CG		 1345 if (IS_ERR(prog))
1346 return PTR_ERR(prog);
1347
1348 err = __reuseport_attach_prog(prog, sk);
1349 if (err < 0) {
1350 __bpf_prog_release(prog);
1351 return err;
1352 }
1353
1354 return 0;
1355}
1356
1357static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1358{
89aa0758 1359 if (sock_flag(sk, SOCK_FILTER_LOCKED))
538950a1 1360 return ERR_PTR(-EPERM);
89aa0758 1361
113214be 1362 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
538950a1
CG		 1363}
1364
1365int sk_attach_bpf(u32 ufd, struct sock *sk)
1366{
1367 struct bpf_prog *prog = __get_bpf(ufd, sk);
1368 int err;
1369
1370 if (IS_ERR(prog))
1371 return PTR_ERR(prog);
1372
8ced425e 1373 err = __sk_attach_prog(prog, sk);
49b31e57 1374 if (err < 0) {
89aa0758 1375 bpf_prog_put(prog);
49b31e57 1376 return err;
89aa0758
AS		 1377 }
1378
89aa0758
AS		 1379 return 0;
1380}
1381
538950a1
CG		 1382int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1383{
1384 struct bpf_prog *prog = __get_bpf(ufd, sk);
1385 int err;
1386
1387 if (IS_ERR(prog))
1388 return PTR_ERR(prog);
1389
1390 err = __reuseport_attach_prog(prog, sk);
1391 if (err < 0) {
1392 bpf_prog_put(prog);
1393 return err;
1394 }
1395
1396 return 0;
1397}
1398
21cafc1d
DB		 1399struct bpf_scratchpad {
1400 union {
1401 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1402 u8 buff[MAX_BPF_STACK];
1403 };
1404};
1405
1406static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
91bc4822 1407
5293efe6
DB		 1408static inline int __bpf_try_make_writable(struct sk_buff *skb,
1409 unsigned int write_len)
1410{
1411 return skb_ensure_writable(skb, write_len);
1412}
1413
db58ba45
AS		 1414static inline int bpf_try_make_writable(struct sk_buff *skb,
1415 unsigned int write_len)
1416{
5293efe6 1417 int err = __bpf_try_make_writable(skb, write_len);
db58ba45 1418
6aaae2b6 1419 bpf_compute_data_pointers(skb);
db58ba45
AS		 1420 return err;
1421}
1422
36bbef52
DB		 1423static int bpf_try_make_head_writable(struct sk_buff *skb)
1424{
1425 return bpf_try_make_writable(skb, skb_headlen(skb));
1426}
1427
a2bfe6bf
DB		 1428static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1429{
1430 if (skb_at_tc_ingress(skb))
1431 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1432}
1433
8065694e
DB		 1434static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1435{
1436 if (skb_at_tc_ingress(skb))
1437 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1438}
1439
f3694e00
DB		 1440BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1441 const void *, from, u32, len, u64, flags)
608cd71a 1442{
608cd71a
AS		 1443 void *ptr;
1444
8afd54c8 1445 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
781c53bc 1446 return -EINVAL;
0ed661d5 1447 if (unlikely(offset > 0xffff))
608cd71a 1448 return -EFAULT;
db58ba45 1449 if (unlikely(bpf_try_make_writable(skb, offset + len)))
608cd71a
AS		 1450 return -EFAULT;
1451
0ed661d5 1452 ptr = skb->data + offset;
781c53bc 1453 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1454 __skb_postpull_rcsum(skb, ptr, len, offset);
608cd71a
AS		 1455
1456 memcpy(ptr, from, len);
1457
781c53bc 1458 if (flags & BPF_F_RECOMPUTE_CSUM)
479ffccc 1459 __skb_postpush_rcsum(skb, ptr, len, offset);
8afd54c8
DB		 1460 if (flags & BPF_F_INVALIDATE_HASH)
1461 skb_clear_hash(skb);
f8ffad69 1462
608cd71a
AS		 1463 return 0;
1464}
1465
577c50aa 1466static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
608cd71a
AS		 1467 .func = bpf_skb_store_bytes,
1468 .gpl_only = false,
1469 .ret_type = RET_INTEGER,
1470 .arg1_type = ARG_PTR_TO_CTX,
1471 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1472 .arg3_type = ARG_PTR_TO_MEM,
1473 .arg4_type = ARG_CONST_SIZE,
91bc4822
AS		 1474 .arg5_type = ARG_ANYTHING,
1475};
1476
f3694e00
DB		 1477BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1478 void *, to, u32, len)
05c74e5e 1479{
05c74e5e
DB		 1480 void *ptr;
1481
0ed661d5 1482 if (unlikely(offset > 0xffff))
074f528e 1483 goto err_clear;
05c74e5e
DB		 1484
1485 ptr = skb_header_pointer(skb, offset, len, to);
1486 if (unlikely(!ptr))
074f528e 1487 goto err_clear;
05c74e5e
DB		 1488 if (ptr != to)
1489 memcpy(to, ptr, len);
1490
1491 return 0;
074f528e
DB		 1492err_clear:
1493 memset(to, 0, len);
1494 return -EFAULT;
05c74e5e
DB		 1495}
1496
577c50aa 1497static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
05c74e5e
DB		 1498 .func = bpf_skb_load_bytes,
1499 .gpl_only = false,
1500 .ret_type = RET_INTEGER,
1501 .arg1_type = ARG_PTR_TO_CTX,
1502 .arg2_type = ARG_ANYTHING,
39f19ebb
AS		 1503 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
1504 .arg4_type = ARG_CONST_SIZE,
05c74e5e
DB		 1505};
1506
36bbef52
DB		 1507BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1508{
1509 /* Idea is the following: should the needed direct read/write
1510 * test fail during runtime, we can pull in more data and redo
1511 * again, since implicitly, we invalidate previous checks here.
1512 *
1513 * Or, since we know how much we need to make read/writeable,
1514 * this can be done once at the program beginning for direct
1515 * access case. By this we overcome limitations of only current
1516 * headroom being accessible.
1517 */
1518 return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1519}
1520
1521static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1522 .func = bpf_skb_pull_data,
1523 .gpl_only = false,
1524 .ret_type = RET_INTEGER,
1525 .arg1_type = ARG_PTR_TO_CTX,
1526 .arg2_type = ARG_ANYTHING,
1527};
1528
f3694e00
DB		 1529BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1530 u64, from, u64, to, u64, flags)
91bc4822 1531{
0ed661d5 1532 __sum16 *ptr;
91bc4822 1533
781c53bc
DB		 1534 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1535 return -EINVAL;
0ed661d5 1536 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1537 return -EFAULT;
0ed661d5 1538 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1539 return -EFAULT;
1540
0ed661d5 1541 ptr = (__sum16 *)(skb->data + offset);
781c53bc 1542 switch (flags & BPF_F_HDR_FIELD_MASK) {
8050c0f0
DB		 1543 case 0:
1544 if (unlikely(from != 0))
1545 return -EINVAL;
1546
1547 csum_replace_by_diff(ptr, to);
1548 break;
91bc4822
AS		 1549 case 2:
1550 csum_replace2(ptr, from, to);
1551 break;
1552 case 4:
1553 csum_replace4(ptr, from, to);
1554 break;
1555 default:
1556 return -EINVAL;
1557 }
1558
91bc4822
AS		 1559 return 0;
1560}
1561
577c50aa 1562static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
91bc4822
AS		 1563 .func = bpf_l3_csum_replace,
1564 .gpl_only = false,
1565 .ret_type = RET_INTEGER,
1566 .arg1_type = ARG_PTR_TO_CTX,
1567 .arg2_type = ARG_ANYTHING,
1568 .arg3_type = ARG_ANYTHING,
1569 .arg4_type = ARG_ANYTHING,
1570 .arg5_type = ARG_ANYTHING,
1571};
1572
f3694e00
DB		 1573BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1574 u64, from, u64, to, u64, flags)
91bc4822 1575{
781c53bc 1576 bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
2f72959a 1577 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
d1b662ad 1578 bool do_mforce = flags & BPF_F_MARK_ENFORCE;
0ed661d5 1579 __sum16 *ptr;
91bc4822 1580
d1b662ad
DB		 1581 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1582 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
781c53bc 1583 return -EINVAL;
0ed661d5 1584 if (unlikely(offset > 0xffff || offset & 1))
91bc4822 1585 return -EFAULT;
0ed661d5 1586 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
91bc4822
AS		 1587 return -EFAULT;
1588
0ed661d5 1589 ptr = (__sum16 *)(skb->data + offset);
d1b662ad 1590 if (is_mmzero && !do_mforce && !*ptr)
2f72959a 1591 return 0;
91bc4822 1592
781c53bc 1593 switch (flags & BPF_F_HDR_FIELD_MASK) {
7d672345
DB		 1594 case 0:
1595 if (unlikely(from != 0))
1596 return -EINVAL;
1597
1598 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1599 break;
91bc4822
AS		 1600 case 2:
1601 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1602 break;
1603 case 4:
1604 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1605 break;
1606 default:
1607 return -EINVAL;
1608 }
1609
2f72959a
DB		 1610 if (is_mmzero && !*ptr)
1611 *ptr = CSUM_MANGLED_0;
91bc4822
AS		 1612 return 0;
1613}
1614
577c50aa 1615static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
91bc4822
AS		 1616 .func = bpf_l4_csum_replace,
1617 .gpl_only = false,
1618 .ret_type = RET_INTEGER,
1619 .arg1_type = ARG_PTR_TO_CTX,
1620 .arg2_type = ARG_ANYTHING,
1621 .arg3_type = ARG_ANYTHING,
1622 .arg4_type = ARG_ANYTHING,
1623 .arg5_type = ARG_ANYTHING,
608cd71a
AS		 1624};
1625
f3694e00
DB		 1626BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1627 __be32 *, to, u32, to_size, __wsum, seed)
7d672345 1628{
21cafc1d 1629 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
f3694e00 1630 u32 diff_size = from_size + to_size;
7d672345
DB		 1631 int i, j = 0;
1632
1633 /* This is quite flexible, some examples:
1634 *
1635 * from_size == 0, to_size > 0, seed := csum --> pushing data
1636 * from_size > 0, to_size == 0, seed := csum --> pulling data
1637 * from_size > 0, to_size > 0, seed := 0 --> diffing data
1638 *
1639 * Even for diffing, from_size and to_size don't need to be equal.
1640 */
1641 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1642 diff_size > sizeof(sp->diff)))
1643 return -EINVAL;
1644
1645 for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1646 sp->diff[j] = ~from[i];
1647 for (i = 0; i < to_size / sizeof(__be32); i++, j++)
1648 sp->diff[j] = to[i];
1649
1650 return csum_partial(sp->diff, diff_size, seed);
1651}
1652
577c50aa 1653static const struct bpf_func_proto bpf_csum_diff_proto = {
7d672345
DB		 1654 .func = bpf_csum_diff,
1655 .gpl_only = false,
36bbef52 1656 .pkt_access = true,
7d672345 1657 .ret_type = RET_INTEGER,
db1ac496 1658 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1659 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
db1ac496 1660 .arg3_type = ARG_PTR_TO_MEM_OR_NULL,
39f19ebb 1661 .arg4_type = ARG_CONST_SIZE_OR_ZERO,
7d672345
DB		 1662 .arg5_type = ARG_ANYTHING,
1663};
1664
36bbef52
DB		 1665BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
1666{
1667 /* The interface is to be used in combination with bpf_csum_diff()
1668 * for direct packet writes. csum rotation for alignment as well
1669 * as emulating csum_sub() can be done from the eBPF program.
1670 */
1671 if (skb->ip_summed == CHECKSUM_COMPLETE)
1672 return (skb->csum = csum_add(skb->csum, csum));
1673
1674 return -ENOTSUPP;
1675}
1676
1677static const struct bpf_func_proto bpf_csum_update_proto = {
1678 .func = bpf_csum_update,
1679 .gpl_only = false,
1680 .ret_type = RET_INTEGER,
1681 .arg1_type = ARG_PTR_TO_CTX,
1682 .arg2_type = ARG_ANYTHING,
1683};
1684
a70b506e
DB		 1685static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
1686{
a70b506e
DB		 1687 return dev_forward_skb(dev, skb);
1688}
1689
4e3264d2
MKL		 1690static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
1691 struct sk_buff *skb)
1692{
1693 int ret = ____dev_forward_skb(dev, skb);
1694
1695 if (likely(!ret)) {
1696 skb->dev = dev;
1697 ret = netif_rx(skb);
1698 }
1699
1700 return ret;
1701}
1702
a70b506e
DB		 1703static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
1704{
1705 int ret;
1706
1707 if (unlikely(__this_cpu_read(xmit_recursion) > XMIT_RECURSION_LIMIT)) {
1708 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
1709 kfree_skb(skb);
1710 return -ENETDOWN;
1711 }
1712
1713 skb->dev = dev;
1714
1715 __this_cpu_inc(xmit_recursion);
1716 ret = dev_queue_xmit(skb);
1717 __this_cpu_dec(xmit_recursion);
1718
1719 return ret;
1720}
1721
4e3264d2
MKL		 1722static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
1723 u32 flags)
1724{
1725 /* skb->mac_len is not set on normal egress */
1726 unsigned int mlen = skb->network_header - skb->mac_header;
1727
1728 __skb_pull(skb, mlen);
1729
1730 /* At ingress, the mac header has already been pulled once.
1731 * At egress, skb_pospull_rcsum has to be done in case that
1732 * the skb is originated from ingress (i.e. a forwarded skb)
1733 * to ensure that rcsum starts at net header.
1734 */
1735 if (!skb_at_tc_ingress(skb))
1736 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
1737 skb_pop_mac_header(skb);
1738 skb_reset_mac_len(skb);
1739 return flags & BPF_F_INGRESS ?
1740 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
1741}
1742
1743static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
1744 u32 flags)
1745{
3a0af8fd
TG		 1746 /* Verify that a link layer header is carried */
1747 if (unlikely(skb->mac_header >= skb->network_header)) {
1748 kfree_skb(skb);
1749 return -ERANGE;
1750 }
1751
4e3264d2
MKL		 1752 bpf_push_mac_rcsum(skb);
1753 return flags & BPF_F_INGRESS ?
1754 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
1755}
1756
1757static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
1758 u32 flags)
1759{
c491680f 1760 if (dev_is_mac_header_xmit(dev))
4e3264d2 1761 return __bpf_redirect_common(skb, dev, flags);
c491680f
DB		 1762 else
1763 return __bpf_redirect_no_mac(skb, dev, flags);
4e3264d2
MKL		 1764}
1765
f3694e00 1766BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
3896d655 1767{
3896d655 1768 struct net_device *dev;
36bbef52
DB		 1769 struct sk_buff *clone;
1770 int ret;
3896d655 1771
781c53bc
DB		 1772 if (unlikely(flags & ~(BPF_F_INGRESS)))
1773 return -EINVAL;
1774
3896d655
AS		 1775 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
1776 if (unlikely(!dev))
1777 return -EINVAL;
1778
36bbef52
DB		 1779 clone = skb_clone(skb, GFP_ATOMIC);
1780 if (unlikely(!clone))
3896d655
AS		 1781 return -ENOMEM;
1782
36bbef52
DB		 1783 /* For direct write, we need to keep the invariant that the skbs
1784 * we're dealing with need to be uncloned. Should uncloning fail
1785 * here, we need to free the just generated clone to unclone once
1786 * again.
1787 */
1788 ret = bpf_try_make_head_writable(skb);
1789 if (unlikely(ret)) {
1790 kfree_skb(clone);
1791 return -ENOMEM;
1792 }
1793
4e3264d2 1794 return __bpf_redirect(clone, dev, flags);
3896d655
AS		 1795}
1796
577c50aa 1797static const struct bpf_func_proto bpf_clone_redirect_proto = {
3896d655
AS		 1798 .func = bpf_clone_redirect,
1799 .gpl_only = false,
1800 .ret_type = RET_INTEGER,
1801 .arg1_type = ARG_PTR_TO_CTX,
1802 .arg2_type = ARG_ANYTHING,
1803 .arg3_type = ARG_ANYTHING,
1804};
1805
27b29f63
AS		 1806struct redirect_info {
1807 u32 ifindex;
1808 u32 flags;
97f91a7c 1809 struct bpf_map *map;
11393cc9 1810 struct bpf_map *map_to_flush;
7c300131 1811 unsigned long map_owner;
27b29f63
AS		 1812};
1813
1814static DEFINE_PER_CPU(struct redirect_info, redirect_info);
781c53bc 1815
f3694e00 1816BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
27b29f63
AS		 1817{
1818 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1819
781c53bc
DB		 1820 if (unlikely(flags & ~(BPF_F_INGRESS)))
1821 return TC_ACT_SHOT;
1822
27b29f63
AS		 1823 ri->ifindex = ifindex;
1824 ri->flags = flags;
781c53bc 1825
27b29f63
AS		 1826 return TC_ACT_REDIRECT;
1827}
1828
1829int skb_do_redirect(struct sk_buff *skb)
1830{
1831 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
1832 struct net_device *dev;
1833
1834 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
1835 ri->ifindex = 0;
1836 if (unlikely(!dev)) {
1837 kfree_skb(skb);
1838 return -EINVAL;
1839 }
1840
4e3264d2 1841 return __bpf_redirect(skb, dev, ri->flags);
27b29f63
AS		 1842}
1843
577c50aa 1844static const struct bpf_func_proto bpf_redirect_proto = {
27b29f63
AS		 1845 .func = bpf_redirect,
1846 .gpl_only = false,
1847 .ret_type = RET_INTEGER,
1848 .arg1_type = ARG_ANYTHING,
1849 .arg2_type = ARG_ANYTHING,
1850};
1851
34f79502
JF		 1852BPF_CALL_4(bpf_sk_redirect_map, struct sk_buff *, skb,
1853 struct bpf_map *, map, u32, key, u64, flags)
174a79ff 1854{
34f79502 1855 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
174a79ff 1856
bfa64075 1857 /* If user passes invalid input drop the packet. */
174a79ff 1858 if (unlikely(flags))
bfa64075 1859 return SK_DROP;
174a79ff 1860
34f79502
JF		 1861 tcb->bpf.key = key;
1862 tcb->bpf.flags = flags;
1863 tcb->bpf.map = map;
174a79ff 1864
bfa64075 1865 return SK_PASS;
174a79ff
JF		 1866}
1867
34f79502 1868struct sock *do_sk_redirect_map(struct sk_buff *skb)
174a79ff 1869{
34f79502 1870 struct tcp_skb_cb *tcb = TCP_SKB_CB(skb);
174a79ff
JF		 1871 struct sock *sk = NULL;
1872
34f79502
JF		 1873 if (tcb->bpf.map) {
1874 sk = __sock_map_lookup_elem(tcb->bpf.map, tcb->bpf.key);
174a79ff 1875
34f79502
JF		 1876 tcb->bpf.key = 0;
1877 tcb->bpf.map = NULL;
174a79ff
JF		 1878 }
1879
1880 return sk;
1881}
1882
1883static const struct bpf_func_proto bpf_sk_redirect_map_proto = {
1884 .func = bpf_sk_redirect_map,
1885 .gpl_only = false,
1886 .ret_type = RET_INTEGER,
34f79502
JF		 1887 .arg1_type = ARG_PTR_TO_CTX,
1888 .arg2_type = ARG_CONST_MAP_PTR,
174a79ff 1889 .arg3_type = ARG_ANYTHING,
34f79502 1890 .arg4_type = ARG_ANYTHING,
174a79ff
JF		 1891};
1892
f3694e00 1893BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
8d20aabe 1894{
f3694e00 1895 return task_get_classid(skb);
8d20aabe
DB		 1896}
1897
1898static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
1899 .func = bpf_get_cgroup_classid,
1900 .gpl_only = false,
1901 .ret_type = RET_INTEGER,
1902 .arg1_type = ARG_PTR_TO_CTX,
1903};
1904
f3694e00 1905BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
c46646d0 1906{
f3694e00 1907 return dst_tclassid(skb);
c46646d0
DB		 1908}
1909
1910static const struct bpf_func_proto bpf_get_route_realm_proto = {
1911 .func = bpf_get_route_realm,
1912 .gpl_only = false,
1913 .ret_type = RET_INTEGER,
1914 .arg1_type = ARG_PTR_TO_CTX,
1915};
1916
f3694e00 1917BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
13c5c240
DB		 1918{
1919 /* If skb_clear_hash() was called due to mangling, we can
1920 * trigger SW recalculation here. Later access to hash
1921 * can then use the inline skb->hash via context directly
1922 * instead of calling this helper again.
1923 */
f3694e00 1924 return skb_get_hash(skb);
13c5c240
DB		 1925}
1926
1927static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
1928 .func = bpf_get_hash_recalc,
1929 .gpl_only = false,
1930 .ret_type = RET_INTEGER,
1931 .arg1_type = ARG_PTR_TO_CTX,
1932};
1933
7a4b28c6
DB		 1934BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
1935{
1936 /* After all direct packet write, this can be used once for
1937 * triggering a lazy recalc on next skb_get_hash() invocation.
1938 */
1939 skb_clear_hash(skb);
1940 return 0;
1941}
1942
1943static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
1944 .func = bpf_set_hash_invalid,
1945 .gpl_only = false,
1946 .ret_type = RET_INTEGER,
1947 .arg1_type = ARG_PTR_TO_CTX,
1948};
1949
ded092cd
DB		 1950BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
1951{
1952 /* Set user specified hash as L4(+), so that it gets returned
1953 * on skb_get_hash() call unless BPF prog later on triggers a
1954 * skb_clear_hash().
1955 */
1956 __skb_set_sw_hash(skb, hash, true);
1957 return 0;
1958}
1959
1960static const struct bpf_func_proto bpf_set_hash_proto = {
1961 .func = bpf_set_hash,
1962 .gpl_only = false,
1963 .ret_type = RET_INTEGER,
1964 .arg1_type = ARG_PTR_TO_CTX,
1965 .arg2_type = ARG_ANYTHING,
1966};
1967
f3694e00
DB		 1968BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
1969 u16, vlan_tci)
4e10df9a 1970{
db58ba45 1971 int ret;
4e10df9a
AS		 1972
1973 if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
1974 vlan_proto != htons(ETH_P_8021AD)))
1975 vlan_proto = htons(ETH_P_8021Q);
1976
8065694e 1977 bpf_push_mac_rcsum(skb);
db58ba45 1978 ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
8065694e
DB		 1979 bpf_pull_mac_rcsum(skb);
1980
6aaae2b6 1981 bpf_compute_data_pointers(skb);
db58ba45 1982 return ret;
4e10df9a
AS		 1983}
1984
1985const struct bpf_func_proto bpf_skb_vlan_push_proto = {
1986 .func = bpf_skb_vlan_push,
1987 .gpl_only = false,
1988 .ret_type = RET_INTEGER,
1989 .arg1_type = ARG_PTR_TO_CTX,
1990 .arg2_type = ARG_ANYTHING,
1991 .arg3_type = ARG_ANYTHING,
1992};
4d9c5c53 1993EXPORT_SYMBOL_GPL(bpf_skb_vlan_push_proto);
4e10df9a 1994
f3694e00 1995BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
4e10df9a 1996{
db58ba45 1997 int ret;
4e10df9a 1998
8065694e 1999 bpf_push_mac_rcsum(skb);
db58ba45 2000 ret = skb_vlan_pop(skb);
8065694e
DB		 2001 bpf_pull_mac_rcsum(skb);
2002
6aaae2b6 2003 bpf_compute_data_pointers(skb);
db58ba45 2004 return ret;
4e10df9a
AS		 2005}
2006
2007const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
2008 .func = bpf_skb_vlan_pop,
2009 .gpl_only = false,
2010 .ret_type = RET_INTEGER,
2011 .arg1_type = ARG_PTR_TO_CTX,
2012};
4d9c5c53 2013EXPORT_SYMBOL_GPL(bpf_skb_vlan_pop_proto);
4e10df9a 2014
6578171a
DB		 2015static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2016{
2017 /* Caller already did skb_cow() with len as headroom,
2018 * so no need to do it here.
2019 */
2020 skb_push(skb, len);
2021 memmove(skb->data, skb->data + len, off);
2022 memset(skb->data + off, 0, len);
2023
2024 /* No skb_postpush_rcsum(skb, skb->data + off, len)
2025 * needed here as it does not change the skb->csum
2026 * result for checksum complete when summing over
2027 * zeroed blocks.
2028 */
2029 return 0;
2030}
2031
2032static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2033{
2034 /* skb_ensure_writable() is not needed here, as we're
2035 * already working on an uncloned skb.
2036 */
2037 if (unlikely(!pskb_may_pull(skb, off + len)))
2038 return -ENOMEM;
2039
2040 skb_postpull_rcsum(skb, skb->data + off, len);
2041 memmove(skb->data + len, skb->data, off);
2042 __skb_pull(skb, len);
2043
2044 return 0;
2045}
2046
2047static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2048{
2049 bool trans_same = skb->transport_header == skb->network_header;
2050 int ret;
2051
2052 /* There's no need for __skb_push()/__skb_pull() pair to
2053 * get to the start of the mac header as we're guaranteed
2054 * to always start from here under eBPF.
2055 */
2056 ret = bpf_skb_generic_push(skb, off, len);
2057 if (likely(!ret)) {
2058 skb->mac_header -= len;
2059 skb->network_header -= len;
2060 if (trans_same)
2061 skb->transport_header = skb->network_header;
2062 }
2063
2064 return ret;
2065}
2066
2067static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2068{
2069 bool trans_same = skb->transport_header == skb->network_header;
2070 int ret;
2071
2072 /* Same here, __skb_push()/__skb_pull() pair not needed. */
2073 ret = bpf_skb_generic_pop(skb, off, len);
2074 if (likely(!ret)) {
2075 skb->mac_header += len;
2076 skb->network_header += len;
2077 if (trans_same)
2078 skb->transport_header = skb->network_header;
2079 }
2080
2081 return ret;
2082}
2083
2084static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2085{
2086 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2087 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2088 int ret;
2089
2090 ret = skb_cow(skb, len_diff);
2091 if (unlikely(ret < 0))
2092 return ret;
2093
2094 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2095 if (unlikely(ret < 0))
2096 return ret;
2097
2098 if (skb_is_gso(skb)) {
880388aa
DM		 2099 /* SKB_GSO_TCPV4 needs to be changed into
2100 * SKB_GSO_TCPV6.
6578171a
DB		 2101 */
2102 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
2103 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV4;
2104 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
2105 }
2106
2107 /* Due to IPv6 header, MSS needs to be downgraded. */
2108 skb_shinfo(skb)->gso_size -= len_diff;
2109 /* Header must be checked, and gso_segs recomputed. */
2110 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2111 skb_shinfo(skb)->gso_segs = 0;
2112 }
2113
2114 skb->protocol = htons(ETH_P_IPV6);
2115 skb_clear_hash(skb);
2116
2117 return 0;
2118}
2119
2120static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2121{
2122 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
0daf4349 2123 u32 off = skb_mac_header_len(skb);
6578171a
DB		 2124 int ret;
2125
2126 ret = skb_unclone(skb, GFP_ATOMIC);
2127 if (unlikely(ret < 0))
2128 return ret;
2129
2130 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2131 if (unlikely(ret < 0))
2132 return ret;
2133
2134 if (skb_is_gso(skb)) {
880388aa
DM		 2135 /* SKB_GSO_TCPV6 needs to be changed into
2136 * SKB_GSO_TCPV4.
6578171a
DB		 2137 */
2138 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
2139 skb_shinfo(skb)->gso_type &= ~SKB_GSO_TCPV6;
2140 skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
2141 }
2142
2143 /* Due to IPv4 header, MSS can be upgraded. */
2144 skb_shinfo(skb)->gso_size += len_diff;
2145 /* Header must be checked, and gso_segs recomputed. */
2146 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2147 skb_shinfo(skb)->gso_segs = 0;
2148 }
2149
2150 skb->protocol = htons(ETH_P_IP);
2151 skb_clear_hash(skb);
2152
2153 return 0;
2154}
2155
2156static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2157{
2158 __be16 from_proto = skb->protocol;
2159
2160 if (from_proto == htons(ETH_P_IP) &&
2161 to_proto == htons(ETH_P_IPV6))
2162 return bpf_skb_proto_4_to_6(skb);
2163
2164 if (from_proto == htons(ETH_P_IPV6) &&
2165 to_proto == htons(ETH_P_IP))
2166 return bpf_skb_proto_6_to_4(skb);
2167
2168 return -ENOTSUPP;
2169}
2170
f3694e00
DB		 2171BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2172 u64, flags)
6578171a 2173{
6578171a
DB		 2174 int ret;
2175
2176 if (unlikely(flags))
2177 return -EINVAL;
2178
2179 /* General idea is that this helper does the basic groundwork
2180 * needed for changing the protocol, and eBPF program fills the
2181 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2182 * and other helpers, rather than passing a raw buffer here.
2183 *
2184 * The rationale is to keep this minimal and without a need to
2185 * deal with raw packet data. F.e. even if we would pass buffers
2186 * here, the program still needs to call the bpf_lX_csum_replace()
2187 * helpers anyway. Plus, this way we keep also separation of
2188 * concerns, since f.e. bpf_skb_store_bytes() should only take
2189 * care of stores.
2190 *
2191 * Currently, additional options and extension header space are
2192 * not supported, but flags register is reserved so we can adapt
2193 * that. For offloads, we mark packet as dodgy, so that headers
2194 * need to be verified first.
2195 */
2196 ret = bpf_skb_proto_xlat(skb, proto);
6aaae2b6 2197 bpf_compute_data_pointers(skb);
6578171a
DB		 2198 return ret;
2199}
2200
2201static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2202 .func = bpf_skb_change_proto,
2203 .gpl_only = false,
2204 .ret_type = RET_INTEGER,
2205 .arg1_type = ARG_PTR_TO_CTX,
2206 .arg2_type = ARG_ANYTHING,
2207 .arg3_type = ARG_ANYTHING,
2208};
2209
f3694e00 2210BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
d2485c42 2211{
d2485c42 2212 /* We only allow a restricted subset to be changed for now. */
45c7fffa
DB		 2213 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2214 !skb_pkt_type_ok(pkt_type)))
d2485c42
DB		 2215 return -EINVAL;
2216
2217 skb->pkt_type = pkt_type;
2218 return 0;
2219}
2220
2221static const struct bpf_func_proto bpf_skb_change_type_proto = {
2222 .func = bpf_skb_change_type,
2223 .gpl_only = false,
2224 .ret_type = RET_INTEGER,
2225 .arg1_type = ARG_PTR_TO_CTX,
2226 .arg2_type = ARG_ANYTHING,
2227};
2228
2be7e212
DB		 2229static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2230{
2231 switch (skb->protocol) {
2232 case htons(ETH_P_IP):
2233 return sizeof(struct iphdr);
2234 case htons(ETH_P_IPV6):
2235 return sizeof(struct ipv6hdr);
2236 default:
2237 return ~0U;
2238 }
2239}
2240
2241static int bpf_skb_net_grow(struct sk_buff *skb, u32 len_diff)
2242{
2243 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2244 int ret;
2245
2246 ret = skb_cow(skb, len_diff);
2247 if (unlikely(ret < 0))
2248 return ret;
2249
2250 ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2251 if (unlikely(ret < 0))
2252 return ret;
2253
2254 if (skb_is_gso(skb)) {
2255 /* Due to header grow, MSS needs to be downgraded. */
2256 skb_shinfo(skb)->gso_size -= len_diff;
2257 /* Header must be checked, and gso_segs recomputed. */
2258 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2259 skb_shinfo(skb)->gso_segs = 0;
2260 }
2261
2262 return 0;
2263}
2264
2265static int bpf_skb_net_shrink(struct sk_buff *skb, u32 len_diff)
2266{
2267 u32 off = skb_mac_header_len(skb) + bpf_skb_net_base_len(skb);
2268 int ret;
2269
2270 ret = skb_unclone(skb, GFP_ATOMIC);
2271 if (unlikely(ret < 0))
2272 return ret;
2273
2274 ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2275 if (unlikely(ret < 0))
2276 return ret;
2277
2278 if (skb_is_gso(skb)) {
2279 /* Due to header shrink, MSS can be upgraded. */
2280 skb_shinfo(skb)->gso_size += len_diff;
2281 /* Header must be checked, and gso_segs recomputed. */
2282 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
2283 skb_shinfo(skb)->gso_segs = 0;
2284 }
2285
2286 return 0;
2287}
2288
2289static u32 __bpf_skb_max_len(const struct sk_buff *skb)
2290{
2291 return skb->dev->mtu + skb->dev->hard_header_len;
2292}
2293
2294static int bpf_skb_adjust_net(struct sk_buff *skb, s32 len_diff)
2295{
2296 bool trans_same = skb->transport_header == skb->network_header;
2297 u32 len_cur, len_diff_abs = abs(len_diff);
2298 u32 len_min = bpf_skb_net_base_len(skb);
2299 u32 len_max = __bpf_skb_max_len(skb);
2300 __be16 proto = skb->protocol;
2301 bool shrink = len_diff < 0;
2302 int ret;
2303
2304 if (unlikely(len_diff_abs > 0xfffU))
2305 return -EFAULT;
2306 if (unlikely(proto != htons(ETH_P_IP) &&
2307 proto != htons(ETH_P_IPV6)))
2308 return -ENOTSUPP;
2309
2310 len_cur = skb->len - skb_network_offset(skb);
2311 if (skb_transport_header_was_set(skb) && !trans_same)
2312 len_cur = skb_network_header_len(skb);
2313 if ((shrink && (len_diff_abs >= len_cur ||
2314 len_cur - len_diff_abs < len_min)) ||
2315 (!shrink && (skb->len + len_diff_abs > len_max &&
2316 !skb_is_gso(skb))))
2317 return -ENOTSUPP;
2318
2319 ret = shrink ? bpf_skb_net_shrink(skb, len_diff_abs) :
2320 bpf_skb_net_grow(skb, len_diff_abs);
2321
6aaae2b6 2322 bpf_compute_data_pointers(skb);
e4a6a342 2323 return ret;
2be7e212
DB		 2324}
2325
2326BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
2327 u32, mode, u64, flags)
2328{
2329 if (unlikely(flags))
2330 return -EINVAL;
2331 if (likely(mode == BPF_ADJ_ROOM_NET))
2332 return bpf_skb_adjust_net(skb, len_diff);
2333
2334 return -ENOTSUPP;
2335}
2336
2337static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
2338 .func = bpf_skb_adjust_room,
2339 .gpl_only = false,
2340 .ret_type = RET_INTEGER,
2341 .arg1_type = ARG_PTR_TO_CTX,
2342 .arg2_type = ARG_ANYTHING,
2343 .arg3_type = ARG_ANYTHING,
2344 .arg4_type = ARG_ANYTHING,
2345};
2346
5293efe6
DB		 2347static u32 __bpf_skb_min_len(const struct sk_buff *skb)
2348{
2349 u32 min_len = skb_network_offset(skb);
2350
2351 if (skb_transport_header_was_set(skb))
2352 min_len = skb_transport_offset(skb);
2353 if (skb->ip_summed == CHECKSUM_PARTIAL)
2354 min_len = skb_checksum_start_offset(skb) +
2355 skb->csum_offset + sizeof(__sum16);
2356 return min_len;
2357}
2358
5293efe6
DB		 2359static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
2360{
2361 unsigned int old_len = skb->len;
2362 int ret;
2363
2364 ret = __skb_grow_rcsum(skb, new_len);
2365 if (!ret)
2366 memset(skb->data + old_len, 0, new_len - old_len);
2367 return ret;
2368}
2369
2370static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
2371{
2372 return __skb_trim_rcsum(skb, new_len);
2373}
2374
f3694e00
DB		 2375BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
2376 u64, flags)
5293efe6 2377{
5293efe6
DB		 2378 u32 max_len = __bpf_skb_max_len(skb);
2379 u32 min_len = __bpf_skb_min_len(skb);
5293efe6
DB		 2380 int ret;
2381
2382 if (unlikely(flags || new_len > max_len || new_len < min_len))
2383 return -EINVAL;
2384 if (skb->encapsulation)
2385 return -ENOTSUPP;
2386
2387 /* The basic idea of this helper is that it's performing the
2388 * needed work to either grow or trim an skb, and eBPF program
2389 * rewrites the rest via helpers like bpf_skb_store_bytes(),
2390 * bpf_lX_csum_replace() and others rather than passing a raw
2391 * buffer here. This one is a slow path helper and intended
2392 * for replies with control messages.
2393 *
2394 * Like in bpf_skb_change_proto(), we want to keep this rather
2395 * minimal and without protocol specifics so that we are able
2396 * to separate concerns as in bpf_skb_store_bytes() should only
2397 * be the one responsible for writing buffers.
2398 *
2399 * It's really expected to be a slow path operation here for
2400 * control message replies, so we're implicitly linearizing,
2401 * uncloning and drop offloads from the skb by this.
2402 */
2403 ret = __bpf_try_make_writable(skb, skb->len);
2404 if (!ret) {
2405 if (new_len > skb->len)
2406 ret = bpf_skb_grow_rcsum(skb, new_len);
2407 else if (new_len < skb->len)
2408 ret = bpf_skb_trim_rcsum(skb, new_len);
2409 if (!ret && skb_is_gso(skb))
2410 skb_gso_reset(skb);
2411 }
2412
6aaae2b6 2413 bpf_compute_data_pointers(skb);
5293efe6
DB		 2414 return ret;
2415}
2416
2417static const struct bpf_func_proto bpf_skb_change_tail_proto = {
2418 .func = bpf_skb_change_tail,
2419 .gpl_only = false,
2420 .ret_type = RET_INTEGER,
2421 .arg1_type = ARG_PTR_TO_CTX,
2422 .arg2_type = ARG_ANYTHING,
2423 .arg3_type = ARG_ANYTHING,
2424};
2425
3a0af8fd
TG		 2426BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
2427 u64, flags)
2428{
2429 u32 max_len = __bpf_skb_max_len(skb);
2430 u32 new_len = skb->len + head_room;
2431 int ret;
2432
2433 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
2434 new_len < skb->len))
2435 return -EINVAL;
2436
2437 ret = skb_cow(skb, head_room);
2438 if (likely(!ret)) {
2439 /* Idea for this helper is that we currently only
2440 * allow to expand on mac header. This means that
2441 * skb->protocol network header, etc, stay as is.
2442 * Compared to bpf_skb_change_tail(), we're more
2443 * flexible due to not needing to linearize or
2444 * reset GSO. Intention for this helper is to be
2445 * used by an L3 skb that needs to push mac header
2446 * for redirection into L2 device.
2447 */
2448 __skb_push(skb, head_room);
2449 memset(skb->data, 0, head_room);
2450 skb_reset_mac_header(skb);
2451 }
2452
6aaae2b6 2453 bpf_compute_data_pointers(skb);
3a0af8fd
TG		 2454 return 0;
2455}
2456
2457static const struct bpf_func_proto bpf_skb_change_head_proto = {
2458 .func = bpf_skb_change_head,
2459 .gpl_only = false,
2460 .ret_type = RET_INTEGER,
2461 .arg1_type = ARG_PTR_TO_CTX,
2462 .arg2_type = ARG_ANYTHING,
2463 .arg3_type = ARG_ANYTHING,
2464};
2465
de8f3a83
DB		 2466static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
2467{
2468 return xdp_data_meta_unsupported(xdp) ? 0 :
2469 xdp->data - xdp->data_meta;
2470}
2471
17bedab2
MKL		 2472BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
2473{
de8f3a83
DB		 2474 unsigned long metalen = xdp_get_metalen(xdp);
2475 void *data_start = xdp->data_hard_start + metalen;
17bedab2
MKL		 2476 void *data = xdp->data + offset;
2477
de8f3a83 2478 if (unlikely(data < data_start ||
17bedab2
MKL		 2479 data > xdp->data_end - ETH_HLEN))
2480 return -EINVAL;
2481
de8f3a83
DB		 2482 if (metalen)
2483 memmove(xdp->data_meta + offset,
2484 xdp->data_meta, metalen);
2485 xdp->data_meta += offset;
17bedab2
MKL		 2486 xdp->data = data;
2487
2488 return 0;
2489}
2490
2491static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
2492 .func = bpf_xdp_adjust_head,
2493 .gpl_only = false,
2494 .ret_type = RET_INTEGER,
2495 .arg1_type = ARG_PTR_TO_CTX,
2496 .arg2_type = ARG_ANYTHING,
2497};
2498
de8f3a83
DB		 2499BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
2500{
2501 void *meta = xdp->data_meta + offset;
2502 unsigned long metalen = xdp->data - meta;
2503
2504 if (xdp_data_meta_unsupported(xdp))
2505 return -ENOTSUPP;
2506 if (unlikely(meta < xdp->data_hard_start ||
2507 meta > xdp->data))
2508 return -EINVAL;
2509 if (unlikely((metalen & (sizeof(__u32) - 1)) ||
2510 (metalen > 32)))
2511 return -EACCES;
2512
2513 xdp->data_meta = meta;
2514
2515 return 0;
2516}
2517
2518static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
2519 .func = bpf_xdp_adjust_meta,
2520 .gpl_only = false,
2521 .ret_type = RET_INTEGER,
2522 .arg1_type = ARG_PTR_TO_CTX,
2523 .arg2_type = ARG_ANYTHING,
2524};
2525
11393cc9
JF		 2526static int __bpf_tx_xdp(struct net_device *dev,
2527 struct bpf_map *map,
2528 struct xdp_buff *xdp,
2529 u32 index)
814abfab 2530{
11393cc9
JF		 2531 int err;
2532
2533 if (!dev->netdev_ops->ndo_xdp_xmit) {
11393cc9 2534 return -EOPNOTSUPP;
814abfab 2535 }
11393cc9
JF		 2536
2537 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2538 if (err)
2539 return err;
9c270af3
JDB		 2540 dev->netdev_ops->ndo_xdp_flush(dev);
2541 return 0;
2542}
2543
2544static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
2545 struct bpf_map *map,
2546 struct xdp_buff *xdp,
2547 u32 index)
2548{
2549 int err;
2550
2551 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2552 struct net_device *dev = fwd;
2553
2554 if (!dev->netdev_ops->ndo_xdp_xmit)
2555 return -EOPNOTSUPP;
2556
2557 err = dev->netdev_ops->ndo_xdp_xmit(dev, xdp);
2558 if (err)
2559 return err;
11393cc9 2560 __dev_map_insert_ctx(map, index);
9c270af3
JDB		 2561
2562 } else if (map->map_type == BPF_MAP_TYPE_CPUMAP) {
2563 struct bpf_cpu_map_entry *rcpu = fwd;
2564
2565 err = cpu_map_enqueue(rcpu, xdp, dev_rx);
2566 if (err)
2567 return err;
2568 __cpu_map_insert_ctx(map, index);
2569 }
e4a8e817 2570 return 0;
814abfab
JF		 2571}
2572
11393cc9
JF		 2573void xdp_do_flush_map(void)
2574{
2575 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2576 struct bpf_map *map = ri->map_to_flush;
2577
11393cc9 2578 ri->map_to_flush = NULL;
9c270af3
JDB		 2579 if (map) {
2580 switch (map->map_type) {
2581 case BPF_MAP_TYPE_DEVMAP:
2582 __dev_map_flush(map);
2583 break;
2584 case BPF_MAP_TYPE_CPUMAP:
2585 __cpu_map_flush(map);
2586 break;
2587 default:
2588 break;
2589 }
2590 }
11393cc9
JF		 2591}
2592EXPORT_SYMBOL_GPL(xdp_do_flush_map);
2593
9c270af3
JDB		 2594static void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
2595{
2596 switch (map->map_type) {
2597 case BPF_MAP_TYPE_DEVMAP:
2598 return __dev_map_lookup_elem(map, index);
2599 case BPF_MAP_TYPE_CPUMAP:
2600 return __cpu_map_lookup_elem(map, index);
2601 default:
2602 return NULL;
2603 }
2604}
2605
7c300131
DB		 2606static inline bool xdp_map_invalid(const struct bpf_prog *xdp_prog,
2607 unsigned long aux)
2608{
2609 return (unsigned long)xdp_prog->aux != aux;
2610}
2611
e4a8e817
DB		 2612static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
2613 struct bpf_prog *xdp_prog)
97f91a7c
JF		 2614{
2615 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
7c300131 2616 unsigned long map_owner = ri->map_owner;
97f91a7c 2617 struct bpf_map *map = ri->map;
11393cc9 2618 u32 index = ri->ifindex;
9c270af3 2619 void *fwd = NULL;
4c03bdd7 2620 int err;
97f91a7c
JF		 2621
2622 ri->ifindex = 0;
2623 ri->map = NULL;
7c300131 2624 ri->map_owner = 0;
109980b8 2625
7c300131 2626 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
96c5508e
JDB		 2627 err = -EFAULT;
2628 map = NULL;
2629 goto err;
2630 }
97f91a7c 2631
9c270af3 2632 fwd = __xdp_map_lookup_elem(map, index);
4c03bdd7
JDB		 2633 if (!fwd) {
2634 err = -EINVAL;
f5836ca5 2635 goto err;
4c03bdd7 2636 }
e4a8e817 2637 if (ri->map_to_flush && ri->map_to_flush != map)
11393cc9
JF		 2638 xdp_do_flush_map();
2639
9c270af3 2640 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index);
f5836ca5
JDB		 2641 if (unlikely(err))
2642 goto err;
2643
2644 ri->map_to_flush = map;
59a30896 2645 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
f5836ca5
JDB		 2646 return 0;
2647err:
59a30896 2648 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
97f91a7c
JF		 2649 return err;
2650}
2651
5acaee0a
JF		 2652int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
2653 struct bpf_prog *xdp_prog)
814abfab
JF		 2654{
2655 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
5acaee0a 2656 struct net_device *fwd;
eb48d682 2657 u32 index = ri->ifindex;
4c03bdd7 2658 int err;
814abfab 2659
97f91a7c
JF		 2660 if (ri->map)
2661 return xdp_do_redirect_map(dev, xdp, xdp_prog);
2662
eb48d682 2663 fwd = dev_get_by_index_rcu(dev_net(dev), index);
814abfab 2664 ri->ifindex = 0;
5acaee0a 2665 if (unlikely(!fwd)) {
4c03bdd7 2666 err = -EINVAL;
f5836ca5 2667 goto err;
814abfab
JF		 2668 }
2669
4c03bdd7 2670 err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
f5836ca5
JDB		 2671 if (unlikely(err))
2672 goto err;
2673
2674 _trace_xdp_redirect(dev, xdp_prog, index);
2675 return 0;
2676err:
2677 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
4c03bdd7 2678 return err;
814abfab
JF		 2679}
2680EXPORT_SYMBOL_GPL(xdp_do_redirect);
2681
9c270af3
JDB		 2682static int __xdp_generic_ok_fwd_dev(struct sk_buff *skb, struct net_device *fwd)
2683{
2684 unsigned int len;
2685
2686 if (unlikely(!(fwd->flags & IFF_UP)))
2687 return -ENETDOWN;
2688
2689 len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
2690 if (skb->len > len)
2691 return -EMSGSIZE;
2692
2693 return 0;
2694}
2695
c060bc61
XS		 2696static int xdp_do_generic_redirect_map(struct net_device *dev,
2697 struct sk_buff *skb,
2698 struct bpf_prog *xdp_prog)
6103aa96
JF		 2699{
2700 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
7c300131 2701 unsigned long map_owner = ri->map_owner;
96c5508e
JDB		 2702 struct bpf_map *map = ri->map;
2703 struct net_device *fwd = NULL;
eb48d682 2704 u32 index = ri->ifindex;
2facaad6 2705 int err = 0;
6103aa96 2706
6103aa96 2707 ri->ifindex = 0;
96c5508e 2708 ri->map = NULL;
7c300131 2709 ri->map_owner = 0;
96c5508e 2710
9c270af3
JDB		 2711 if (unlikely(xdp_map_invalid(xdp_prog, map_owner))) {
2712 err = -EFAULT;
2713 map = NULL;
2714 goto err;
96c5508e 2715 }
9c270af3 2716 fwd = __xdp_map_lookup_elem(map, index);
2facaad6
JDB		 2717 if (unlikely(!fwd)) {
2718 err = -EINVAL;
f5836ca5 2719 goto err;
6103aa96
JF		 2720 }
2721
9c270af3
JDB		 2722 if (map->map_type == BPF_MAP_TYPE_DEVMAP) {
2723 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2724 goto err;
2725 skb->dev = fwd;
2726 } else {
2727 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
2728 err = -EBADRQC;
f5836ca5 2729 goto err;
2facaad6 2730 }
6103aa96 2731
9c270af3
JDB		 2732 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
2733 return 0;
2734err:
2735 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
2736 return err;
2737}
2738
2739int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
2740 struct bpf_prog *xdp_prog)
2741{
2742 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2743 u32 index = ri->ifindex;
2744 struct net_device *fwd;
2745 int err = 0;
2746
2747 if (ri->map)
2748 return xdp_do_generic_redirect_map(dev, skb, xdp_prog);
2749
2750 ri->ifindex = 0;
2751 fwd = dev_get_by_index_rcu(dev_net(dev), index);
2752 if (unlikely(!fwd)) {
2753 err = -EINVAL;
f5836ca5 2754 goto err;
2facaad6
JDB		 2755 }
2756
9c270af3
JDB		 2757 if (unlikely((err = __xdp_generic_ok_fwd_dev(skb, fwd))))
2758 goto err;
2759
2facaad6 2760 skb->dev = fwd;
9c270af3 2761 _trace_xdp_redirect(dev, xdp_prog, index);
f5836ca5
JDB		 2762 return 0;
2763err:
9c270af3 2764 _trace_xdp_redirect_err(dev, xdp_prog, index, err);
2facaad6 2765 return err;
6103aa96
JF		 2766}
2767EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
2768
814abfab
JF		 2769BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
2770{
2771 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2772
2773 if (unlikely(flags))
2774 return XDP_ABORTED;
2775
2776 ri->ifindex = ifindex;
2777 ri->flags = flags;
109980b8 2778 ri->map = NULL;
7c300131 2779 ri->map_owner = 0;
e4a8e817 2780
814abfab
JF		 2781 return XDP_REDIRECT;
2782}
2783
2784static const struct bpf_func_proto bpf_xdp_redirect_proto = {
2785 .func = bpf_xdp_redirect,
2786 .gpl_only = false,
2787 .ret_type = RET_INTEGER,
2788 .arg1_type = ARG_ANYTHING,
2789 .arg2_type = ARG_ANYTHING,
2790};
2791
109980b8 2792BPF_CALL_4(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, u64, flags,
7c300131 2793 unsigned long, map_owner)
e4a8e817
DB		 2794{
2795 struct redirect_info *ri = this_cpu_ptr(&redirect_info);
2796
2797 if (unlikely(flags))
2798 return XDP_ABORTED;
2799
2800 ri->ifindex = ifindex;
2801 ri->flags = flags;
2802 ri->map = map;
109980b8 2803 ri->map_owner = map_owner;
e4a8e817
DB		 2804
2805 return XDP_REDIRECT;
2806}
2807
109980b8
DB		 2808/* Note, arg4 is hidden from users and populated by the verifier
2809 * with the right pointer.
2810 */
e4a8e817
DB		 2811static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
2812 .func = bpf_xdp_redirect_map,
2813 .gpl_only = false,
2814 .ret_type = RET_INTEGER,
2815 .arg1_type = ARG_CONST_MAP_PTR,
2816 .arg2_type = ARG_ANYTHING,
2817 .arg3_type = ARG_ANYTHING,
2818};
2819
17bedab2 2820bool bpf_helper_changes_pkt_data(void *func)
4e10df9a 2821{
36bbef52
DB		 2822 if (func == bpf_skb_vlan_push ||
2823 func == bpf_skb_vlan_pop ||
2824 func == bpf_skb_store_bytes ||
2825 func == bpf_skb_change_proto ||
3a0af8fd 2826 func == bpf_skb_change_head ||
36bbef52 2827 func == bpf_skb_change_tail ||
2be7e212 2828 func == bpf_skb_adjust_room ||
36bbef52 2829 func == bpf_skb_pull_data ||
41703a73 2830 func == bpf_clone_redirect ||
36bbef52 2831 func == bpf_l3_csum_replace ||
17bedab2 2832 func == bpf_l4_csum_replace ||
de8f3a83
DB		 2833 func == bpf_xdp_adjust_head ||
2834 func == bpf_xdp_adjust_meta)
3697649f
DB		 2835 return true;
2836
4e10df9a
AS		 2837 return false;
2838}
2839
555c8a86 2840static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
aa7145c1 2841 unsigned long off, unsigned long len)
555c8a86 2842{
aa7145c1 2843 void *ptr = skb_header_pointer(skb, off, len, dst_buff);
555c8a86
DB		 2844
2845 if (unlikely(!ptr))
2846 return len;
2847 if (ptr != dst_buff)
2848 memcpy(dst_buff, ptr, len);
2849
2850 return 0;
2851}
2852
f3694e00
DB		 2853BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
2854 u64, flags, void *, meta, u64, meta_size)
555c8a86 2855{
555c8a86 2856 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
555c8a86
DB		 2857
2858 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
2859 return -EINVAL;
2860 if (unlikely(skb_size > skb->len))
2861 return -EFAULT;
2862
2863 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
2864 bpf_skb_copy);
2865}
2866
2867static const struct bpf_func_proto bpf_skb_event_output_proto = {
2868 .func = bpf_skb_event_output,
2869 .gpl_only = true,
2870 .ret_type = RET_INTEGER,
2871 .arg1_type = ARG_PTR_TO_CTX,
2872 .arg2_type = ARG_CONST_MAP_PTR,
2873 .arg3_type = ARG_ANYTHING,
39f19ebb 2874 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 2875 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
555c8a86
DB		 2876};
2877
c6c33454
DB		 2878static unsigned short bpf_tunnel_key_af(u64 flags)
2879{
2880 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
2881}
2882
f3694e00
DB		 2883BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
2884 u32, size, u64, flags)
d3aa45ce 2885{
c6c33454
DB		 2886 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
2887 u8 compat[sizeof(struct bpf_tunnel_key)];
074f528e
DB		 2888 void *to_orig = to;
2889 int err;
d3aa45ce 2890
074f528e
DB		 2891 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
2892 err = -EINVAL;
2893 goto err_clear;
2894 }
2895 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
2896 err = -EPROTO;
2897 goto err_clear;
2898 }
c6c33454 2899 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
074f528e 2900 err = -EINVAL;
c6c33454 2901 switch (size) {
4018ab18 2902 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 2903 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4018ab18 2904 goto set_compat;
c6c33454
DB		 2905 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
2906 /* Fixup deprecated structure layouts here, so we have
2907 * a common path later on.
2908 */
2909 if (ip_tunnel_info_af(info) != AF_INET)
074f528e 2910 goto err_clear;
4018ab18 2911set_compat:
c6c33454
DB		 2912 to = (struct bpf_tunnel_key *)compat;
2913 break;
2914 default:
074f528e 2915 goto err_clear;
c6c33454
DB		 2916 }
2917 }
d3aa45ce
AS		 2918
2919 to->tunnel_id = be64_to_cpu(info->key.tun_id);
c6c33454
DB		 2920 to->tunnel_tos = info->key.tos;
2921 to->tunnel_ttl = info->key.ttl;
2922
4018ab18 2923 if (flags & BPF_F_TUNINFO_IPV6) {
c6c33454
DB		 2924 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
2925 sizeof(to->remote_ipv6));
4018ab18
DB		 2926 to->tunnel_label = be32_to_cpu(info->key.label);
2927 } else {
c6c33454 2928 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
4018ab18 2929 }
c6c33454
DB		 2930
2931 if (unlikely(size != sizeof(struct bpf_tunnel_key)))
074f528e 2932 memcpy(to_orig, to, size);
d3aa45ce
AS		 2933
2934 return 0;
074f528e
DB		 2935err_clear:
2936 memset(to_orig, 0, size);
2937 return err;
d3aa45ce
AS		 2938}
2939
577c50aa 2940static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
d3aa45ce
AS		 2941 .func = bpf_skb_get_tunnel_key,
2942 .gpl_only = false,
2943 .ret_type = RET_INTEGER,
2944 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 2945 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2946 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 2947 .arg4_type = ARG_ANYTHING,
2948};
2949
f3694e00 2950BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
14ca0751 2951{
14ca0751 2952 const struct ip_tunnel_info *info = skb_tunnel_info(skb);
074f528e 2953 int err;
14ca0751
DB		 2954
2955 if (unlikely(!info ||
074f528e
DB		 2956 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
2957 err = -ENOENT;
2958 goto err_clear;
2959 }
2960 if (unlikely(size < info->options_len)) {
2961 err = -ENOMEM;
2962 goto err_clear;
2963 }
14ca0751
DB		 2964
2965 ip_tunnel_info_opts_get(to, info);
074f528e
DB		 2966 if (size > info->options_len)
2967 memset(to + info->options_len, 0, size - info->options_len);
14ca0751
DB		 2968
2969 return info->options_len;
074f528e
DB		 2970err_clear:
2971 memset(to, 0, size);
2972 return err;
14ca0751
DB		 2973}
2974
2975static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
2976 .func = bpf_skb_get_tunnel_opt,
2977 .gpl_only = false,
2978 .ret_type = RET_INTEGER,
2979 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 2980 .arg2_type = ARG_PTR_TO_UNINIT_MEM,
2981 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 2982};
2983
d3aa45ce
AS		 2984static struct metadata_dst __percpu *md_dst;
2985
f3694e00
DB		 2986BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
2987 const struct bpf_tunnel_key *, from, u32, size, u64, flags)
d3aa45ce 2988{
d3aa45ce 2989 struct metadata_dst *md = this_cpu_ptr(md_dst);
c6c33454 2990 u8 compat[sizeof(struct bpf_tunnel_key)];
d3aa45ce
AS		 2991 struct ip_tunnel_info *info;
2992
22080870
DB		 2993 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
2994 BPF_F_DONT_FRAGMENT)))
d3aa45ce 2995 return -EINVAL;
c6c33454
DB		 2996 if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
2997 switch (size) {
4018ab18 2998 case offsetof(struct bpf_tunnel_key, tunnel_label):
c0e760c9 2999 case offsetof(struct bpf_tunnel_key, tunnel_ext):
c6c33454
DB		 3000 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3001 /* Fixup deprecated structure layouts here, so we have
3002 * a common path later on.
3003 */
3004 memcpy(compat, from, size);
3005 memset(compat + size, 0, sizeof(compat) - size);
f3694e00 3006 from = (const struct bpf_tunnel_key *) compat;
c6c33454
DB		 3007 break;
3008 default:
3009 return -EINVAL;
3010 }
3011 }
c0e760c9
DB		 3012 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3013 from->tunnel_ext))
4018ab18 3014 return -EINVAL;
d3aa45ce
AS		 3015
3016 skb_dst_drop(skb);
3017 dst_hold((struct dst_entry *) md);
3018 skb_dst_set(skb, (struct dst_entry *) md);
3019
3020 info = &md->u.tun_info;
3021 info->mode = IP_TUNNEL_INFO_TX;
c6c33454 3022
db3c6139 3023 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
22080870
DB		 3024 if (flags & BPF_F_DONT_FRAGMENT)
3025 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
792f3dd6
WT		 3026 if (flags & BPF_F_ZERO_CSUM_TX)
3027 info->key.tun_flags &= ~TUNNEL_CSUM;
22080870 3028
d3aa45ce 3029 info->key.tun_id = cpu_to_be64(from->tunnel_id);
c6c33454
DB		 3030 info->key.tos = from->tunnel_tos;
3031 info->key.ttl = from->tunnel_ttl;
3032
3033 if (flags & BPF_F_TUNINFO_IPV6) {
3034 info->mode |= IP_TUNNEL_INFO_IPV6;
3035 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3036 sizeof(from->remote_ipv6));
4018ab18
DB		 3037 info->key.label = cpu_to_be32(from->tunnel_label) &
3038 IPV6_FLOWLABEL_MASK;
c6c33454
DB		 3039 } else {
3040 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3041 }
d3aa45ce
AS		 3042
3043 return 0;
3044}
3045
577c50aa 3046static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
d3aa45ce
AS		 3047 .func = bpf_skb_set_tunnel_key,
3048 .gpl_only = false,
3049 .ret_type = RET_INTEGER,
3050 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3051 .arg2_type = ARG_PTR_TO_MEM,
3052 .arg3_type = ARG_CONST_SIZE,
d3aa45ce
AS		 3053 .arg4_type = ARG_ANYTHING,
3054};
3055
f3694e00
DB		 3056BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3057 const u8 *, from, u32, size)
14ca0751 3058{
14ca0751
DB		 3059 struct ip_tunnel_info *info = skb_tunnel_info(skb);
3060 const struct metadata_dst *md = this_cpu_ptr(md_dst);
3061
3062 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3063 return -EINVAL;
fca5fdf6 3064 if (unlikely(size > IP_TUNNEL_OPTS_MAX))
14ca0751
DB		 3065 return -ENOMEM;
3066
3067 ip_tunnel_info_opts_set(info, from, size);
3068
3069 return 0;
3070}
3071
3072static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3073 .func = bpf_skb_set_tunnel_opt,
3074 .gpl_only = false,
3075 .ret_type = RET_INTEGER,
3076 .arg1_type = ARG_PTR_TO_CTX,
39f19ebb
AS		 3077 .arg2_type = ARG_PTR_TO_MEM,
3078 .arg3_type = ARG_CONST_SIZE,
14ca0751
DB		 3079};
3080
3081static const struct bpf_func_proto *
3082bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
d3aa45ce
AS		 3083{
3084 if (!md_dst) {
d66f2b91
JK		 3085 struct metadata_dst __percpu *tmp;
3086
3087 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3088 METADATA_IP_TUNNEL,
3089 GFP_KERNEL);
3090 if (!tmp)
d3aa45ce 3091 return NULL;
d66f2b91
JK		 3092 if (cmpxchg(&md_dst, NULL, tmp))
3093 metadata_dst_free_percpu(tmp);
d3aa45ce 3094 }
14ca0751
DB		 3095
3096 switch (which) {
3097 case BPF_FUNC_skb_set_tunnel_key:
3098 return &bpf_skb_set_tunnel_key_proto;
3099 case BPF_FUNC_skb_set_tunnel_opt:
3100 return &bpf_skb_set_tunnel_opt_proto;
3101 default:
3102 return NULL;
3103 }
d3aa45ce
AS		 3104}
3105
f3694e00
DB		 3106BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3107 u32, idx)
4a482f34 3108{
4a482f34
MKL		 3109 struct bpf_array *array = container_of(map, struct bpf_array, map);
3110 struct cgroup *cgrp;
3111 struct sock *sk;
4a482f34 3112
2d48c5f9 3113 sk = skb_to_full_sk(skb);
4a482f34
MKL		 3114 if (!sk || !sk_fullsock(sk))
3115 return -ENOENT;
f3694e00 3116 if (unlikely(idx >= array->map.max_entries))
4a482f34
MKL		 3117 return -E2BIG;
3118
f3694e00 3119 cgrp = READ_ONCE(array->ptrs[idx]);
4a482f34
MKL		 3120 if (unlikely(!cgrp))
3121 return -EAGAIN;
3122
54fd9c2d 3123 return sk_under_cgroup_hierarchy(sk, cgrp);
4a482f34
MKL		 3124}
3125
747ea55e
DB		 3126static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3127 .func = bpf_skb_under_cgroup,
4a482f34
MKL		 3128 .gpl_only = false,
3129 .ret_type = RET_INTEGER,
3130 .arg1_type = ARG_PTR_TO_CTX,
3131 .arg2_type = ARG_CONST_MAP_PTR,
3132 .arg3_type = ARG_ANYTHING,
3133};
4a482f34 3134
4de16969
DB		 3135static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
3136 unsigned long off, unsigned long len)
3137{
3138 memcpy(dst_buff, src_buff + off, len);
3139 return 0;
3140}
3141
f3694e00
DB		 3142BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
3143 u64, flags, void *, meta, u64, meta_size)
4de16969 3144{
4de16969 3145 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4de16969
DB		 3146
3147 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3148 return -EINVAL;
3149 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
3150 return -EFAULT;
3151
9c471370
MKL		 3152 return bpf_event_output(map, flags, meta, meta_size, xdp->data,
3153 xdp_size, bpf_xdp_copy);
4de16969
DB		 3154}
3155
3156static const struct bpf_func_proto bpf_xdp_event_output_proto = {
3157 .func = bpf_xdp_event_output,
3158 .gpl_only = true,
3159 .ret_type = RET_INTEGER,
3160 .arg1_type = ARG_PTR_TO_CTX,
3161 .arg2_type = ARG_CONST_MAP_PTR,
3162 .arg3_type = ARG_ANYTHING,
39f19ebb 3163 .arg4_type = ARG_PTR_TO_MEM,
1728a4f2 3164 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
4de16969
DB		 3165};
3166
91b8270f
CF		 3167BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
3168{
3169 return skb->sk ? sock_gen_cookie(skb->sk) : 0;
3170}
3171
3172static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
3173 .func = bpf_get_socket_cookie,
3174 .gpl_only = false,
3175 .ret_type = RET_INTEGER,
3176 .arg1_type = ARG_PTR_TO_CTX,
3177};
3178
6acc5c29
CF		 3179BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
3180{
3181 struct sock *sk = sk_to_full_sk(skb->sk);
3182 kuid_t kuid;
3183
3184 if (!sk || !sk_fullsock(sk))
3185 return overflowuid;
3186 kuid = sock_net_uid(sock_net(sk), sk);
3187 return from_kuid_munged(sock_net(sk)->user_ns, kuid);
3188}
3189
3190static const struct bpf_func_proto bpf_get_socket_uid_proto = {
3191 .func = bpf_get_socket_uid,
3192 .gpl_only = false,
3193 .ret_type = RET_INTEGER,
3194 .arg1_type = ARG_PTR_TO_CTX,
3195};
3196
8c4b4c7e
LB		 3197BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3198 int, level, int, optname, char *, optval, int, optlen)
3199{
3200 struct sock *sk = bpf_sock->sk;
3201 int ret = 0;
3202 int val;
3203
3204 if (!sk_fullsock(sk))
3205 return -EINVAL;
3206
3207 if (level == SOL_SOCKET) {
3208 if (optlen != sizeof(int))
3209 return -EINVAL;
3210 val = *((int *)optval);
3211
3212 /* Only some socketops are supported */
3213 switch (optname) {
3214 case SO_RCVBUF:
3215 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
3216 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
3217 break;
3218 case SO_SNDBUF:
3219 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
3220 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
3221 break;
3222 case SO_MAX_PACING_RATE:
3223 sk->sk_max_pacing_rate = val;
3224 sk->sk_pacing_rate = min(sk->sk_pacing_rate,
3225 sk->sk_max_pacing_rate);
3226 break;
3227 case SO_PRIORITY:
3228 sk->sk_priority = val;
3229 break;
3230 case SO_RCVLOWAT:
3231 if (val < 0)
3232 val = INT_MAX;
3233 sk->sk_rcvlowat = val ? : 1;
3234 break;
3235 case SO_MARK:
3236 sk->sk_mark = val;
3237 break;
3238 default:
3239 ret = -EINVAL;
3240 }
a5192c52 3241#ifdef CONFIG_INET
6f9bd3d7
LB		 3242#if IS_ENABLED(CONFIG_IPV6)
3243 } else if (level == SOL_IPV6) {
3244 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
3245 return -EINVAL;
3246
3247 val = *((int *)optval);
3248 /* Only some options are supported */
3249 switch (optname) {
3250 case IPV6_TCLASS:
3251 if (val < -1 || val > 0xff) {
3252 ret = -EINVAL;
3253 } else {
3254 struct ipv6_pinfo *np = inet6_sk(sk);
3255
3256 if (val == -1)
3257 val = 0;
3258 np->tclass = val;
3259 }
3260 break;
3261 default:
3262 ret = -EINVAL;
3263 }
3264#endif
8c4b4c7e
LB		 3265 } else if (level == SOL_TCP &&
3266 sk->sk_prot->setsockopt == tcp_setsockopt) {
91b5b21c
LB		 3267 if (optname == TCP_CONGESTION) {
3268 char name[TCP_CA_NAME_MAX];
ebfa00c5 3269 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
91b5b21c
LB		 3270
3271 strncpy(name, optval, min_t(long, optlen,
3272 TCP_CA_NAME_MAX-1));
3273 name[TCP_CA_NAME_MAX-1] = 0;
6f9bd3d7
LB		 3274 ret = tcp_set_congestion_control(sk, name, false,
3275 reinit);
91b5b21c 3276 } else {
fc747810
LB		 3277 struct tcp_sock *tp = tcp_sk(sk);
3278
3279 if (optlen != sizeof(int))
3280 return -EINVAL;
3281
3282 val = *((int *)optval);
3283 /* Only some options are supported */
3284 switch (optname) {
3285 case TCP_BPF_IW:
3286 if (val <= 0 || tp->data_segs_out > 0)
3287 ret = -EINVAL;
3288 else
3289 tp->snd_cwnd = val;
3290 break;
13bf9641
LB		 3291 case TCP_BPF_SNDCWND_CLAMP:
3292 if (val <= 0) {
3293 ret = -EINVAL;
3294 } else {
3295 tp->snd_cwnd_clamp = val;
3296 tp->snd_ssthresh = val;
3297 }
6d3f06a0 3298 break;
fc747810
LB		 3299 default:
3300 ret = -EINVAL;
3301 }
91b5b21c 3302 }
91b5b21c 3303#endif
8c4b4c7e
LB		 3304 } else {
3305 ret = -EINVAL;
3306 }
3307 return ret;
3308}
3309
3310static const struct bpf_func_proto bpf_setsockopt_proto = {
3311 .func = bpf_setsockopt,
cd86d1fd 3312 .gpl_only = false,
8c4b4c7e
LB		 3313 .ret_type = RET_INTEGER,
3314 .arg1_type = ARG_PTR_TO_CTX,
3315 .arg2_type = ARG_ANYTHING,
3316 .arg3_type = ARG_ANYTHING,
3317 .arg4_type = ARG_PTR_TO_MEM,
3318 .arg5_type = ARG_CONST_SIZE,
3319};
3320
cd86d1fd
LB		 3321BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
3322 int, level, int, optname, char *, optval, int, optlen)
3323{
3324 struct sock *sk = bpf_sock->sk;
cd86d1fd
LB		 3325
3326 if (!sk_fullsock(sk))
3327 goto err_clear;
3328
3329#ifdef CONFIG_INET
3330 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
3331 if (optname == TCP_CONGESTION) {
3332 struct inet_connection_sock *icsk = inet_csk(sk);
3333
3334 if (!icsk->icsk_ca_ops || optlen <= 1)
3335 goto err_clear;
3336 strncpy(optval, icsk->icsk_ca_ops->name, optlen);
3337 optval[optlen - 1] = 0;
3338 } else {
3339 goto err_clear;
3340 }
6f9bd3d7
LB		 3341#if IS_ENABLED(CONFIG_IPV6)
3342 } else if (level == SOL_IPV6) {
3343 struct ipv6_pinfo *np = inet6_sk(sk);
3344
3345 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
3346 goto err_clear;
3347
3348 /* Only some options are supported */
3349 switch (optname) {
3350 case IPV6_TCLASS:
3351 *((int *)optval) = (int)np->tclass;
3352 break;
3353 default:
3354 goto err_clear;
3355 }
3356#endif
cd86d1fd
LB		 3357 } else {
3358 goto err_clear;
3359 }
aa2bc739 3360 return 0;
cd86d1fd
LB		 3361#endif
3362err_clear:
3363 memset(optval, 0, optlen);
3364 return -EINVAL;
3365}
3366
3367static const struct bpf_func_proto bpf_getsockopt_proto = {
3368 .func = bpf_getsockopt,
3369 .gpl_only = false,
3370 .ret_type = RET_INTEGER,
3371 .arg1_type = ARG_PTR_TO_CTX,
3372 .arg2_type = ARG_ANYTHING,
3373 .arg3_type = ARG_ANYTHING,
3374 .arg4_type = ARG_PTR_TO_UNINIT_MEM,
3375 .arg5_type = ARG_CONST_SIZE,
3376};
3377
b13d8807
LB		 3378BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
3379 int, argval)
3380{
3381 struct sock *sk = bpf_sock->sk;
3382 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
3383
3384 if (!sk_fullsock(sk))
3385 return -EINVAL;
3386
3387#ifdef CONFIG_INET
3388 if (val)
3389 tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
3390
3391 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
3392#else
3393 return -EINVAL;
3394#endif
3395}
3396
3397static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
3398 .func = bpf_sock_ops_cb_flags_set,
3399 .gpl_only = false,
3400 .ret_type = RET_INTEGER,
3401 .arg1_type = ARG_PTR_TO_CTX,
3402 .arg2_type = ARG_ANYTHING,
3403};
3404
d4052c4a 3405static const struct bpf_func_proto *
2492d3b8 3406bpf_base_func_proto(enum bpf_func_id func_id)
89aa0758
AS		 3407{
3408 switch (func_id) {
3409 case BPF_FUNC_map_lookup_elem:
3410 return &bpf_map_lookup_elem_proto;
3411 case BPF_FUNC_map_update_elem:
3412 return &bpf_map_update_elem_proto;
3413 case BPF_FUNC_map_delete_elem:
3414 return &bpf_map_delete_elem_proto;
03e69b50
DB		 3415 case BPF_FUNC_get_prandom_u32:
3416 return &bpf_get_prandom_u32_proto;
c04167ce 3417 case BPF_FUNC_get_smp_processor_id:
80b48c44 3418 return &bpf_get_raw_smp_processor_id_proto;
2d0e30c3
DB		 3419 case BPF_FUNC_get_numa_node_id:
3420 return &bpf_get_numa_node_id_proto;
04fd61ab
AS		 3421 case BPF_FUNC_tail_call:
3422 return &bpf_tail_call_proto;
17ca8cbf
DB		 3423 case BPF_FUNC_ktime_get_ns:
3424 return &bpf_ktime_get_ns_proto;
0756ea3e 3425 case BPF_FUNC_trace_printk:
1be7f75d
AS		 3426 if (capable(CAP_SYS_ADMIN))
3427 return bpf_get_trace_printk_proto();
89aa0758
AS		 3428 default:
3429 return NULL;
3430 }
3431}
3432
ae2cf1c4
DA		 3433static const struct bpf_func_proto *
3434sock_filter_func_proto(enum bpf_func_id func_id)
3435{
3436 switch (func_id) {
3437 /* inet and inet6 sockets are created in a process
3438 * context so there is always a valid uid/gid
3439 */
3440 case BPF_FUNC_get_current_uid_gid:
3441 return &bpf_get_current_uid_gid_proto;
3442 default:
3443 return bpf_base_func_proto(func_id);
3444 }
3445}
3446
2492d3b8
DB		 3447static const struct bpf_func_proto *
3448sk_filter_func_proto(enum bpf_func_id func_id)
3449{
3450 switch (func_id) {
3451 case BPF_FUNC_skb_load_bytes:
3452 return &bpf_skb_load_bytes_proto;
91b8270f
CF		 3453 case BPF_FUNC_get_socket_cookie:
3454 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 3455 case BPF_FUNC_get_socket_uid:
3456 return &bpf_get_socket_uid_proto;
2492d3b8
DB		 3457 default:
3458 return bpf_base_func_proto(func_id);
3459 }
3460}
3461
608cd71a
AS		 3462static const struct bpf_func_proto *
3463tc_cls_act_func_proto(enum bpf_func_id func_id)
3464{
3465 switch (func_id) {
3466 case BPF_FUNC_skb_store_bytes:
3467 return &bpf_skb_store_bytes_proto;
05c74e5e
DB		 3468 case BPF_FUNC_skb_load_bytes:
3469 return &bpf_skb_load_bytes_proto;
36bbef52
DB		 3470 case BPF_FUNC_skb_pull_data:
3471 return &bpf_skb_pull_data_proto;
7d672345
DB		 3472 case BPF_FUNC_csum_diff:
3473 return &bpf_csum_diff_proto;
36bbef52
DB		 3474 case BPF_FUNC_csum_update:
3475 return &bpf_csum_update_proto;
91bc4822
AS		 3476 case BPF_FUNC_l3_csum_replace:
3477 return &bpf_l3_csum_replace_proto;
3478 case BPF_FUNC_l4_csum_replace:
3479 return &bpf_l4_csum_replace_proto;
3896d655
AS		 3480 case BPF_FUNC_clone_redirect:
3481 return &bpf_clone_redirect_proto;
8d20aabe
DB		 3482 case BPF_FUNC_get_cgroup_classid:
3483 return &bpf_get_cgroup_classid_proto;
4e10df9a
AS		 3484 case BPF_FUNC_skb_vlan_push:
3485 return &bpf_skb_vlan_push_proto;
3486 case BPF_FUNC_skb_vlan_pop:
3487 return &bpf_skb_vlan_pop_proto;
6578171a
DB		 3488 case BPF_FUNC_skb_change_proto:
3489 return &bpf_skb_change_proto_proto;
d2485c42
DB		 3490 case BPF_FUNC_skb_change_type:
3491 return &bpf_skb_change_type_proto;
2be7e212
DB		 3492 case BPF_FUNC_skb_adjust_room:
3493 return &bpf_skb_adjust_room_proto;
5293efe6
DB		 3494 case BPF_FUNC_skb_change_tail:
3495 return &bpf_skb_change_tail_proto;
d3aa45ce
AS		 3496 case BPF_FUNC_skb_get_tunnel_key:
3497 return &bpf_skb_get_tunnel_key_proto;
3498 case BPF_FUNC_skb_set_tunnel_key:
14ca0751
DB		 3499 return bpf_get_skb_set_tunnel_proto(func_id);
3500 case BPF_FUNC_skb_get_tunnel_opt:
3501 return &bpf_skb_get_tunnel_opt_proto;
3502 case BPF_FUNC_skb_set_tunnel_opt:
3503 return bpf_get_skb_set_tunnel_proto(func_id);
27b29f63
AS		 3504 case BPF_FUNC_redirect:
3505 return &bpf_redirect_proto;
c46646d0
DB		 3506 case BPF_FUNC_get_route_realm:
3507 return &bpf_get_route_realm_proto;
13c5c240
DB		 3508 case BPF_FUNC_get_hash_recalc:
3509 return &bpf_get_hash_recalc_proto;
7a4b28c6
DB		 3510 case BPF_FUNC_set_hash_invalid:
3511 return &bpf_set_hash_invalid_proto;
ded092cd
DB		 3512 case BPF_FUNC_set_hash:
3513 return &bpf_set_hash_proto;
bd570ff9 3514 case BPF_FUNC_perf_event_output:
555c8a86 3515 return &bpf_skb_event_output_proto;
80b48c44
DB		 3516 case BPF_FUNC_get_smp_processor_id:
3517 return &bpf_get_smp_processor_id_proto;
747ea55e
DB		 3518 case BPF_FUNC_skb_under_cgroup:
3519 return &bpf_skb_under_cgroup_proto;
91b8270f
CF		 3520 case BPF_FUNC_get_socket_cookie:
3521 return &bpf_get_socket_cookie_proto;
6acc5c29
CF		 3522 case BPF_FUNC_get_socket_uid:
3523 return &bpf_get_socket_uid_proto;
608cd71a 3524 default:
2492d3b8 3525 return bpf_base_func_proto(func_id);
608cd71a
AS		 3526 }
3527}
3528
6a773a15
BB		 3529static const struct bpf_func_proto *
3530xdp_func_proto(enum bpf_func_id func_id)
3531{
4de16969
DB		 3532 switch (func_id) {
3533 case BPF_FUNC_perf_event_output:
3534 return &bpf_xdp_event_output_proto;
669dc4d7
DB		 3535 case BPF_FUNC_get_smp_processor_id:
3536 return &bpf_get_smp_processor_id_proto;
205c3807
DB		 3537 case BPF_FUNC_csum_diff:
3538 return &bpf_csum_diff_proto;
17bedab2
MKL		 3539 case BPF_FUNC_xdp_adjust_head:
3540 return &bpf_xdp_adjust_head_proto;
de8f3a83
DB		 3541 case BPF_FUNC_xdp_adjust_meta:
3542 return &bpf_xdp_adjust_meta_proto;
814abfab
JF		 3543 case BPF_FUNC_redirect:
3544 return &bpf_xdp_redirect_proto;
97f91a7c 3545 case BPF_FUNC_redirect_map:
e4a8e817 3546 return &bpf_xdp_redirect_map_proto;
4de16969 3547 default:
2492d3b8 3548 return bpf_base_func_proto(func_id);
4de16969 3549 }
6a773a15
BB		 3550}
3551
3a0af8fd
TG		 3552static const struct bpf_func_proto *
3553lwt_inout_func_proto(enum bpf_func_id func_id)
3554{
3555 switch (func_id) {
3556 case BPF_FUNC_skb_load_bytes:
3557 return &bpf_skb_load_bytes_proto;
3558 case BPF_FUNC_skb_pull_data:
3559 return &bpf_skb_pull_data_proto;
3560 case BPF_FUNC_csum_diff:
3561 return &bpf_csum_diff_proto;
3562 case BPF_FUNC_get_cgroup_classid:
3563 return &bpf_get_cgroup_classid_proto;
3564 case BPF_FUNC_get_route_realm:
3565 return &bpf_get_route_realm_proto;
3566 case BPF_FUNC_get_hash_recalc:
3567 return &bpf_get_hash_recalc_proto;
3568 case BPF_FUNC_perf_event_output:
3569 return &bpf_skb_event_output_proto;
3570 case BPF_FUNC_get_smp_processor_id:
3571 return &bpf_get_smp_processor_id_proto;
3572 case BPF_FUNC_skb_under_cgroup:
3573 return &bpf_skb_under_cgroup_proto;
3574 default:
2492d3b8 3575 return bpf_base_func_proto(func_id);
3a0af8fd
TG		 3576 }
3577}
3578
8c4b4c7e
LB		 3579static const struct bpf_func_proto *
3580 sock_ops_func_proto(enum bpf_func_id func_id)
3581{
3582 switch (func_id) {
3583 case BPF_FUNC_setsockopt:
3584 return &bpf_setsockopt_proto;
cd86d1fd
LB		 3585 case BPF_FUNC_getsockopt:
3586 return &bpf_getsockopt_proto;
b13d8807
LB		 3587 case BPF_FUNC_sock_ops_cb_flags_set:
3588 return &bpf_sock_ops_cb_flags_set_proto;
174a79ff
JF		 3589 case BPF_FUNC_sock_map_update:
3590 return &bpf_sock_map_update_proto;
8c4b4c7e
LB		 3591 default:
3592 return bpf_base_func_proto(func_id);
3593 }
3594}
3595
b005fd18
JF		 3596static const struct bpf_func_proto *sk_skb_func_proto(enum bpf_func_id func_id)
3597{
3598 switch (func_id) {
8a31db56
JF		 3599 case BPF_FUNC_skb_store_bytes:
3600 return &bpf_skb_store_bytes_proto;
b005fd18
JF		 3601 case BPF_FUNC_skb_load_bytes:
3602 return &bpf_skb_load_bytes_proto;
8a31db56
JF		 3603 case BPF_FUNC_skb_pull_data:
3604 return &bpf_skb_pull_data_proto;
3605 case BPF_FUNC_skb_change_tail:
3606 return &bpf_skb_change_tail_proto;
3607 case BPF_FUNC_skb_change_head:
3608 return &bpf_skb_change_head_proto;
b005fd18
JF		 3609 case BPF_FUNC_get_socket_cookie:
3610 return &bpf_get_socket_cookie_proto;
3611 case BPF_FUNC_get_socket_uid:
3612 return &bpf_get_socket_uid_proto;
174a79ff
JF		 3613 case BPF_FUNC_sk_redirect_map:
3614 return &bpf_sk_redirect_map_proto;
b005fd18
JF		 3615 default:
3616 return bpf_base_func_proto(func_id);
3617 }
3618}
3619
3a0af8fd
TG		 3620static const struct bpf_func_proto *
3621lwt_xmit_func_proto(enum bpf_func_id func_id)
3622{
3623 switch (func_id) {
3624 case BPF_FUNC_skb_get_tunnel_key:
3625 return &bpf_skb_get_tunnel_key_proto;
3626 case BPF_FUNC_skb_set_tunnel_key:
3627 return bpf_get_skb_set_tunnel_proto(func_id);
3628 case BPF_FUNC_skb_get_tunnel_opt:
3629 return &bpf_skb_get_tunnel_opt_proto;
3630 case BPF_FUNC_skb_set_tunnel_opt:
3631 return bpf_get_skb_set_tunnel_proto(func_id);
3632 case BPF_FUNC_redirect:
3633 return &bpf_redirect_proto;
3634 case BPF_FUNC_clone_redirect:
3635 return &bpf_clone_redirect_proto;
3636 case BPF_FUNC_skb_change_tail:
3637 return &bpf_skb_change_tail_proto;
3638 case BPF_FUNC_skb_change_head:
3639 return &bpf_skb_change_head_proto;
3640 case BPF_FUNC_skb_store_bytes:
3641 return &bpf_skb_store_bytes_proto;
3642 case BPF_FUNC_csum_update:
3643 return &bpf_csum_update_proto;
3644 case BPF_FUNC_l3_csum_replace:
3645 return &bpf_l3_csum_replace_proto;
3646 case BPF_FUNC_l4_csum_replace:
3647 return &bpf_l4_csum_replace_proto;
3648 case BPF_FUNC_set_hash_invalid:
3649 return &bpf_set_hash_invalid_proto;
3650 default:
3651 return lwt_inout_func_proto(func_id);
3652 }
3653}
3654
f96da094
DB		 3655static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
3656 struct bpf_insn_access_aux *info)
23994631 3657{
f96da094 3658 const int size_default = sizeof(__u32);
23994631 3659
9bac3d6d
AS		 3660 if (off < 0 || off >= sizeof(struct __sk_buff))
3661 return false;
62c7989b 3662
4936e352 3663 /* The verifier guarantees that size > 0. */
9bac3d6d
AS		 3664 if (off % size != 0)
3665 return false;
62c7989b
DB		 3666
3667 switch (off) {
f96da094
DB		 3668 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3669 if (off + size > offsetofend(struct __sk_buff, cb[4]))
62c7989b
DB		 3670 return false;
3671 break;
8a31db56
JF		 3672 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
3673 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
3674 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
3675 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
f96da094 3676 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 3677 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094
DB		 3678 case bpf_ctx_range(struct __sk_buff, data_end):
3679 if (size != size_default)
23994631 3680 return false;
31fd8581
YS		 3681 break;
3682 default:
f96da094 3683 /* Only narrow read access allowed for now. */
31fd8581 3684 if (type == BPF_WRITE) {
f96da094 3685 if (size != size_default)
31fd8581
YS		 3686 return false;
3687 } else {
f96da094
DB		 3688 bpf_ctx_record_field_size(info, size_default);
3689 if (!bpf_ctx_narrow_access_ok(off, size, size_default))
23994631 3690 return false;
31fd8581 3691 }
62c7989b 3692 }
9bac3d6d
AS		 3693
3694 return true;
3695}
3696
d691f9e8 3697static bool sk_filter_is_valid_access(int off, int size,
19de99f7 3698 enum bpf_access_type type,
23994631 3699 struct bpf_insn_access_aux *info)
d691f9e8 3700{
db58ba45 3701 switch (off) {
f96da094
DB		 3702 case bpf_ctx_range(struct __sk_buff, tc_classid):
3703 case bpf_ctx_range(struct __sk_buff, data):
de8f3a83 3704 case bpf_ctx_range(struct __sk_buff, data_meta):
f96da094 3705 case bpf_ctx_range(struct __sk_buff, data_end):
8a31db56 3706 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
045efa82 3707 return false;
db58ba45 3708 }
045efa82 3709
d691f9e8
AS		 3710 if (type == BPF_WRITE) {
3711 switch (off) {
f96da094 3712 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 3713 break;
3714 default:
3715 return false;
3716 }
3717 }
3718
f96da094 3719 return bpf_skb_is_valid_access(off, size, type, info);
d691f9e8
AS		 3720}
3721
3a0af8fd
TG		 3722static bool lwt_is_valid_access(int off, int size,
3723 enum bpf_access_type type,
23994631 3724 struct bpf_insn_access_aux *info)
3a0af8fd
TG		 3725{
3726 switch (off) {
f96da094 3727 case bpf_ctx_range(struct __sk_buff, tc_classid):
8a31db56 3728 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
de8f3a83 3729 case bpf_ctx_range(struct __sk_buff, data_meta):
3a0af8fd
TG		 3730 return false;
3731 }
3732
3733 if (type == BPF_WRITE) {
3734 switch (off) {
f96da094
DB		 3735 case bpf_ctx_range(struct __sk_buff, mark):
3736 case bpf_ctx_range(struct __sk_buff, priority):
3737 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
3a0af8fd
TG		 3738 break;
3739 default:
3740 return false;
3741 }
3742 }
3743
f96da094
DB		 3744 switch (off) {
3745 case bpf_ctx_range(struct __sk_buff, data):
3746 info->reg_type = PTR_TO_PACKET;
3747 break;
3748 case bpf_ctx_range(struct __sk_buff, data_end):
3749 info->reg_type = PTR_TO_PACKET_END;
3750 break;
3751 }
3752
3753 return bpf_skb_is_valid_access(off, size, type, info);
3a0af8fd
TG		 3754}
3755
61023658
DA		 3756static bool sock_filter_is_valid_access(int off, int size,
3757 enum bpf_access_type type,
23994631 3758 struct bpf_insn_access_aux *info)
61023658
DA		 3759{
3760 if (type == BPF_WRITE) {
3761 switch (off) {
3762 case offsetof(struct bpf_sock, bound_dev_if):
482dca93 3763 case offsetof(struct bpf_sock, mark):
482dca93
DA		 3764 case offsetof(struct bpf_sock, priority):
3765 break;
61023658
DA		 3766 default:
3767 return false;
3768 }
3769 }
3770
3771 if (off < 0 || off + size > sizeof(struct bpf_sock))
3772 return false;
61023658
DA		 3773 /* The verifier guarantees that size > 0. */
3774 if (off % size != 0)
3775 return false;
61023658
DA		 3776 if (size != sizeof(__u32))
3777 return false;
3778
3779 return true;
3780}
3781
047b0ecd
DB		 3782static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
3783 const struct bpf_prog *prog, int drop_verdict)
36bbef52
DB		 3784{
3785 struct bpf_insn *insn = insn_buf;
3786
3787 if (!direct_write)
3788 return 0;
3789
3790 /* if (!skb->cloned)
3791 * goto start;
3792 *
3793 * (Fast-path, otherwise approximation that we might be
3794 * a clone, do the rest in helper.)
3795 */
3796 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
3797 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
3798 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
3799
3800 /* ret = bpf_skb_pull_data(skb, 0); */
3801 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
3802 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
3803 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
3804 BPF_FUNC_skb_pull_data);
3805 /* if (!ret)
3806 * goto restore;
3807 * return TC_ACT_SHOT;
3808 */
3809 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
047b0ecd 3810 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
36bbef52
DB		 3811 *insn++ = BPF_EXIT_INSN();
3812
3813 /* restore: */
3814 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
3815 /* start: */
3816 *insn++ = prog->insnsi[0];
3817
3818 return insn - insn_buf;
3819}
3820
047b0ecd
DB		 3821static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
3822 const struct bpf_prog *prog)
3823{
3824 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
3825}
3826
d691f9e8 3827static bool tc_cls_act_is_valid_access(int off, int size,
19de99f7 3828 enum bpf_access_type type,
23994631 3829 struct bpf_insn_access_aux *info)
d691f9e8
AS		 3830{
3831 if (type == BPF_WRITE) {
3832 switch (off) {
f96da094
DB		 3833 case bpf_ctx_range(struct __sk_buff, mark):
3834 case bpf_ctx_range(struct __sk_buff, tc_index):
3835 case bpf_ctx_range(struct __sk_buff, priority):
3836 case bpf_ctx_range(struct __sk_buff, tc_classid):
3837 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
d691f9e8
AS		 3838 break;
3839 default:
3840 return false;
3841 }
3842 }
19de99f7 3843
f96da094
DB		 3844 switch (off) {
3845 case bpf_ctx_range(struct __sk_buff, data):
3846 info->reg_type = PTR_TO_PACKET;
3847 break;
de8f3a83
DB		 3848 case bpf_ctx_range(struct __sk_buff, data_meta):
3849 info->reg_type = PTR_TO_PACKET_META;
3850 break;
f96da094
DB		 3851 case bpf_ctx_range(struct __sk_buff, data_end):
3852 info->reg_type = PTR_TO_PACKET_END;
3853 break;
8a31db56
JF		 3854 case bpf_ctx_range_till(struct __sk_buff, family, local_port):
3855 return false;
f96da094
DB		 3856 }
3857
3858 return bpf_skb_is_valid_access(off, size, type, info);
d691f9e8
AS		 3859}
3860
1afaf661 3861static bool __is_valid_xdp_access(int off, int size)
6a773a15
BB		 3862{
3863 if (off < 0 || off >= sizeof(struct xdp_md))
3864 return false;
3865 if (off % size != 0)
3866 return false;
6088b582 3867 if (size != sizeof(__u32))
6a773a15
BB		 3868 return false;
3869
3870 return true;
3871}
3872
3873static bool xdp_is_valid_access(int off, int size,
3874 enum bpf_access_type type,
23994631 3875 struct bpf_insn_access_aux *info)
6a773a15
BB		 3876{
3877 if (type == BPF_WRITE)
3878 return false;
3879
3880 switch (off) {
3881 case offsetof(struct xdp_md, data):
23994631 3882 info->reg_type = PTR_TO_PACKET;
6a773a15 3883 break;
de8f3a83
DB		 3884 case offsetof(struct xdp_md, data_meta):
3885 info->reg_type = PTR_TO_PACKET_META;
3886 break;
6a773a15 3887 case offsetof(struct xdp_md, data_end):
23994631 3888 info->reg_type = PTR_TO_PACKET_END;
6a773a15
BB		 3889 break;
3890 }
3891
1afaf661 3892 return __is_valid_xdp_access(off, size);
6a773a15
BB		 3893}
3894
3895void bpf_warn_invalid_xdp_action(u32 act)
3896{
9beb8bed
DB		 3897 const u32 act_max = XDP_REDIRECT;
3898
3899 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
3900 act > act_max ? "Illegal" : "Driver unsupported",
3901 act);
6a773a15
BB		 3902}
3903EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
3904
44f0e430
LB		 3905static bool sock_ops_is_valid_access(int off, int size,
3906 enum bpf_access_type type,
3907 struct bpf_insn_access_aux *info)
40304b2a 3908{
44f0e430
LB		 3909 const int size_default = sizeof(__u32);
3910
40304b2a
LB		 3911 if (off < 0 || off >= sizeof(struct bpf_sock_ops))
3912 return false;
44f0e430 3913
40304b2a
LB		 3914 /* The verifier guarantees that size > 0. */
3915 if (off % size != 0)
3916 return false;
40304b2a 3917
40304b2a
LB		 3918 if (type == BPF_WRITE) {
3919 switch (off) {
2585cd62 3920 case offsetof(struct bpf_sock_ops, reply):
6f9bd3d7 3921 case offsetof(struct bpf_sock_ops, sk_txhash):
44f0e430
LB		 3922 if (size != size_default)
3923 return false;
40304b2a
LB		 3924 break;
3925 default:
3926 return false;
3927 }
44f0e430
LB		 3928 } else {
3929 switch (off) {
3930 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
3931 bytes_acked):
3932 if (size != sizeof(__u64))
3933 return false;
3934 break;
3935 default:
3936 if (size != size_default)
3937 return false;
3938 break;
3939 }
40304b2a
LB		 3940 }
3941
44f0e430 3942 return true;
40304b2a
LB		 3943}
3944
8a31db56
JF		 3945static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
3946 const struct bpf_prog *prog)
3947{
047b0ecd 3948 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
8a31db56
JF		 3949}
3950
b005fd18
JF		 3951static bool sk_skb_is_valid_access(int off, int size,
3952 enum bpf_access_type type,
3953 struct bpf_insn_access_aux *info)
3954{
de8f3a83
DB		 3955 switch (off) {
3956 case bpf_ctx_range(struct __sk_buff, tc_classid):
3957 case bpf_ctx_range(struct __sk_buff, data_meta):
3958 return false;
3959 }
3960
8a31db56
JF		 3961 if (type == BPF_WRITE) {
3962 switch (off) {
8a31db56
JF		 3963 case bpf_ctx_range(struct __sk_buff, tc_index):
3964 case bpf_ctx_range(struct __sk_buff, priority):
3965 break;
3966 default:
3967 return false;
3968 }
3969 }
3970
b005fd18 3971 switch (off) {
f7e9cb1e 3972 case bpf_ctx_range(struct __sk_buff, mark):
8a31db56 3973 return false;
b005fd18
JF		 3974 case bpf_ctx_range(struct __sk_buff, data):
3975 info->reg_type = PTR_TO_PACKET;
3976 break;
3977 case bpf_ctx_range(struct __sk_buff, data_end):
3978 info->reg_type = PTR_TO_PACKET_END;
3979 break;
3980 }
3981
3982 return bpf_skb_is_valid_access(off, size, type, info);
3983}
3984
2492d3b8
DB		 3985static u32 bpf_convert_ctx_access(enum bpf_access_type type,
3986 const struct bpf_insn *si,
3987 struct bpf_insn *insn_buf,
f96da094 3988 struct bpf_prog *prog, u32 *target_size)
9bac3d6d
AS		 3989{
3990 struct bpf_insn *insn = insn_buf;
6b8cc1d1 3991 int off;
9bac3d6d 3992
6b8cc1d1 3993 switch (si->off) {
9bac3d6d 3994 case offsetof(struct __sk_buff, len):
6b8cc1d1 3995 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 3996 bpf_target_off(struct sk_buff, len, 4,
3997 target_size));
9bac3d6d
AS		 3998 break;
3999
0b8c707d 4000 case offsetof(struct __sk_buff, protocol):
6b8cc1d1 4001 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 4002 bpf_target_off(struct sk_buff, protocol, 2,
4003 target_size));
0b8c707d
DB		 4004 break;
4005
27cd5452 4006 case offsetof(struct __sk_buff, vlan_proto):
6b8cc1d1 4007 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 4008 bpf_target_off(struct sk_buff, vlan_proto, 2,
4009 target_size));
27cd5452
MS		 4010 break;
4011
bcad5718 4012 case offsetof(struct __sk_buff, priority):
754f1e6a 4013 if (type == BPF_WRITE)
6b8cc1d1 4014 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4015 bpf_target_off(struct sk_buff, priority, 4,
4016 target_size));
754f1e6a 4017 else
6b8cc1d1 4018 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4019 bpf_target_off(struct sk_buff, priority, 4,
4020 target_size));
bcad5718
DB		 4021 break;
4022
37e82c2f 4023 case offsetof(struct __sk_buff, ingress_ifindex):
6b8cc1d1 4024 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4025 bpf_target_off(struct sk_buff, skb_iif, 4,
4026 target_size));
37e82c2f
AS		 4027 break;
4028
4029 case offsetof(struct __sk_buff, ifindex):
f035a515 4030 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 4031 si->dst_reg, si->src_reg,
37e82c2f 4032 offsetof(struct sk_buff, dev));
6b8cc1d1
DB		 4033 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
4034 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 4035 bpf_target_off(struct net_device, ifindex, 4,
4036 target_size));
37e82c2f
AS		 4037 break;
4038
ba7591d8 4039 case offsetof(struct __sk_buff, hash):
6b8cc1d1 4040 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4041 bpf_target_off(struct sk_buff, hash, 4,
4042 target_size));
ba7591d8
DB		 4043 break;
4044
9bac3d6d 4045 case offsetof(struct __sk_buff, mark):
d691f9e8 4046 if (type == BPF_WRITE)
6b8cc1d1 4047 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4048 bpf_target_off(struct sk_buff, mark, 4,
4049 target_size));
d691f9e8 4050 else
6b8cc1d1 4051 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4052 bpf_target_off(struct sk_buff, mark, 4,
4053 target_size));
d691f9e8 4054 break;
9bac3d6d
AS		 4055
4056 case offsetof(struct __sk_buff, pkt_type):
f96da094
DB		 4057 *target_size = 1;
4058 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
4059 PKT_TYPE_OFFSET());
4060 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
4061#ifdef __BIG_ENDIAN_BITFIELD
4062 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
4063#endif
4064 break;
9bac3d6d
AS		 4065
4066 case offsetof(struct __sk_buff, queue_mapping):
f96da094
DB		 4067 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4068 bpf_target_off(struct sk_buff, queue_mapping, 2,
4069 target_size));
4070 break;
c2497395 4071
c2497395 4072 case offsetof(struct __sk_buff, vlan_present):
c2497395 4073 case offsetof(struct __sk_buff, vlan_tci):
f96da094
DB		 4074 BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
4075
4076 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
4077 bpf_target_off(struct sk_buff, vlan_tci, 2,
4078 target_size));
4079 if (si->off == offsetof(struct __sk_buff, vlan_tci)) {
4080 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg,
4081 ~VLAN_TAG_PRESENT);
4082 } else {
4083 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 12);
4084 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
4085 }
4086 break;
d691f9e8
AS		 4087
4088 case offsetof(struct __sk_buff, cb[0]) ...
f96da094 4089 offsetofend(struct __sk_buff, cb[4]) - 1:
d691f9e8 4090 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20);
62c7989b
DB		 4091 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
4092 offsetof(struct qdisc_skb_cb, data)) %
4093 sizeof(__u64));
d691f9e8 4094
ff936a04 4095 prog->cb_access = 1;
6b8cc1d1
DB		 4096 off = si->off;
4097 off -= offsetof(struct __sk_buff, cb[0]);
4098 off += offsetof(struct sk_buff, cb);
4099 off += offsetof(struct qdisc_skb_cb, data);
d691f9e8 4100 if (type == BPF_WRITE)
62c7989b 4101 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 4102 si->src_reg, off);
d691f9e8 4103 else
62c7989b 4104 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
6b8cc1d1 4105 si->src_reg, off);
d691f9e8
AS		 4106 break;
4107
045efa82 4108 case offsetof(struct __sk_buff, tc_classid):
6b8cc1d1
DB		 4109 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2);
4110
4111 off = si->off;
4112 off -= offsetof(struct __sk_buff, tc_classid);
4113 off += offsetof(struct sk_buff, cb);
4114 off += offsetof(struct qdisc_skb_cb, tc_classid);
f96da094 4115 *target_size = 2;
09c37a2c 4116 if (type == BPF_WRITE)
6b8cc1d1
DB		 4117 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
4118 si->src_reg, off);
09c37a2c 4119 else
6b8cc1d1
DB		 4120 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
4121 si->src_reg, off);
045efa82
DB		 4122 break;
4123
db58ba45 4124 case offsetof(struct __sk_buff, data):
f035a515 4125 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
6b8cc1d1 4126 si->dst_reg, si->src_reg,
db58ba45
AS		 4127 offsetof(struct sk_buff, data));
4128 break;
4129
de8f3a83
DB		 4130 case offsetof(struct __sk_buff, data_meta):
4131 off = si->off;
4132 off -= offsetof(struct __sk_buff, data_meta);
4133 off += offsetof(struct sk_buff, cb);
4134 off += offsetof(struct bpf_skb_data_end, data_meta);
4135 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4136 si->src_reg, off);
4137 break;
4138
db58ba45 4139 case offsetof(struct __sk_buff, data_end):
6b8cc1d1
DB		 4140 off = si->off;
4141 off -= offsetof(struct __sk_buff, data_end);
4142 off += offsetof(struct sk_buff, cb);
4143 off += offsetof(struct bpf_skb_data_end, data_end);
4144 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4145 si->src_reg, off);
db58ba45
AS		 4146 break;
4147
d691f9e8
AS		 4148 case offsetof(struct __sk_buff, tc_index):
4149#ifdef CONFIG_NET_SCHED
d691f9e8 4150 if (type == BPF_WRITE)
6b8cc1d1 4151 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 4152 bpf_target_off(struct sk_buff, tc_index, 2,
4153 target_size));
d691f9e8 4154 else
6b8cc1d1 4155 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
f96da094
DB		 4156 bpf_target_off(struct sk_buff, tc_index, 2,
4157 target_size));
d691f9e8 4158#else
2ed46ce4 4159 *target_size = 2;
d691f9e8 4160 if (type == BPF_WRITE)
6b8cc1d1 4161 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
d691f9e8 4162 else
6b8cc1d1 4163 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
b1d9fc41
DB		 4164#endif
4165 break;
4166
4167 case offsetof(struct __sk_buff, napi_id):
4168#if defined(CONFIG_NET_RX_BUSY_POLL)
b1d9fc41 4169 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
f96da094
DB		 4170 bpf_target_off(struct sk_buff, napi_id, 4,
4171 target_size));
b1d9fc41
DB		 4172 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
4173 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
4174#else
2ed46ce4 4175 *target_size = 4;
b1d9fc41 4176 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
d691f9e8 4177#endif
6b8cc1d1 4178 break;
8a31db56
JF		 4179 case offsetof(struct __sk_buff, family):
4180 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4181
4182 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4183 si->dst_reg, si->src_reg,
4184 offsetof(struct sk_buff, sk));
4185 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4186 bpf_target_off(struct sock_common,
4187 skc_family,
4188 2, target_size));
4189 break;
4190 case offsetof(struct __sk_buff, remote_ip4):
4191 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4192
4193 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4194 si->dst_reg, si->src_reg,
4195 offsetof(struct sk_buff, sk));
4196 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4197 bpf_target_off(struct sock_common,
4198 skc_daddr,
4199 4, target_size));
4200 break;
4201 case offsetof(struct __sk_buff, local_ip4):
4202 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4203 skc_rcv_saddr) != 4);
4204
4205 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4206 si->dst_reg, si->src_reg,
4207 offsetof(struct sk_buff, sk));
4208 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4209 bpf_target_off(struct sock_common,
4210 skc_rcv_saddr,
4211 4, target_size));
4212 break;
4213 case offsetof(struct __sk_buff, remote_ip6[0]) ...
4214 offsetof(struct __sk_buff, remote_ip6[3]):
4215#if IS_ENABLED(CONFIG_IPV6)
4216 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4217 skc_v6_daddr.s6_addr32[0]) != 4);
4218
4219 off = si->off;
4220 off -= offsetof(struct __sk_buff, remote_ip6[0]);
4221
4222 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4223 si->dst_reg, si->src_reg,
4224 offsetof(struct sk_buff, sk));
4225 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4226 offsetof(struct sock_common,
4227 skc_v6_daddr.s6_addr32[0]) +
4228 off);
4229#else
4230 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4231#endif
4232 break;
4233 case offsetof(struct __sk_buff, local_ip6[0]) ...
4234 offsetof(struct __sk_buff, local_ip6[3]):
4235#if IS_ENABLED(CONFIG_IPV6)
4236 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4237 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4238
4239 off = si->off;
4240 off -= offsetof(struct __sk_buff, local_ip6[0]);
4241
4242 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4243 si->dst_reg, si->src_reg,
4244 offsetof(struct sk_buff, sk));
4245 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4246 offsetof(struct sock_common,
4247 skc_v6_rcv_saddr.s6_addr32[0]) +
4248 off);
4249#else
4250 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4251#endif
4252 break;
4253
4254 case offsetof(struct __sk_buff, remote_port):
4255 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4256
4257 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4258 si->dst_reg, si->src_reg,
4259 offsetof(struct sk_buff, sk));
4260 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4261 bpf_target_off(struct sock_common,
4262 skc_dport,
4263 2, target_size));
4264#ifndef __BIG_ENDIAN_BITFIELD
4265 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4266#endif
4267 break;
4268
4269 case offsetof(struct __sk_buff, local_port):
4270 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4271
4272 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
4273 si->dst_reg, si->src_reg,
4274 offsetof(struct sk_buff, sk));
4275 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4276 bpf_target_off(struct sock_common,
4277 skc_num, 2, target_size));
4278 break;
9bac3d6d
AS		 4279 }
4280
4281 return insn - insn_buf;
89aa0758
AS		 4282}
4283
61023658 4284static u32 sock_filter_convert_ctx_access(enum bpf_access_type type,
6b8cc1d1 4285 const struct bpf_insn *si,
61023658 4286 struct bpf_insn *insn_buf,
f96da094 4287 struct bpf_prog *prog, u32 *target_size)
61023658
DA		 4288{
4289 struct bpf_insn *insn = insn_buf;
4290
6b8cc1d1 4291 switch (si->off) {
61023658
DA		 4292 case offsetof(struct bpf_sock, bound_dev_if):
4293 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4);
4294
4295 if (type == BPF_WRITE)
6b8cc1d1 4296 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 4297 offsetof(struct sock, sk_bound_dev_if));
4298 else
6b8cc1d1 4299 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
61023658
DA		 4300 offsetof(struct sock, sk_bound_dev_if));
4301 break;
aa4c1037 4302
482dca93
DA		 4303 case offsetof(struct bpf_sock, mark):
4304 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4);
4305
4306 if (type == BPF_WRITE)
4307 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4308 offsetof(struct sock, sk_mark));
4309 else
4310 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4311 offsetof(struct sock, sk_mark));
4312 break;
4313
4314 case offsetof(struct bpf_sock, priority):
4315 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4);
4316
4317 if (type == BPF_WRITE)
4318 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4319 offsetof(struct sock, sk_priority));
4320 else
4321 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4322 offsetof(struct sock, sk_priority));
4323 break;
4324
aa4c1037
DA		 4325 case offsetof(struct bpf_sock, family):
4326 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_family) != 2);
4327
6b8cc1d1 4328 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
aa4c1037
DA		 4329 offsetof(struct sock, sk_family));
4330 break;
4331
4332 case offsetof(struct bpf_sock, type):
6b8cc1d1 4333 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 4334 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 4335 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK);
4336 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT);
aa4c1037
DA		 4337 break;
4338
4339 case offsetof(struct bpf_sock, protocol):
6b8cc1d1 4340 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
aa4c1037 4341 offsetof(struct sock, __sk_flags_offset));
6b8cc1d1
DB		 4342 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);
4343 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT);
aa4c1037 4344 break;
61023658
DA		 4345 }
4346
4347 return insn - insn_buf;
4348}
4349
6b8cc1d1
DB		 4350static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
4351 const struct bpf_insn *si,
374fb54e 4352 struct bpf_insn *insn_buf,
f96da094 4353 struct bpf_prog *prog, u32 *target_size)
374fb54e
DB		 4354{
4355 struct bpf_insn *insn = insn_buf;
4356
6b8cc1d1 4357 switch (si->off) {
374fb54e 4358 case offsetof(struct __sk_buff, ifindex):
374fb54e 4359 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
6b8cc1d1 4360 si->dst_reg, si->src_reg,
374fb54e 4361 offsetof(struct sk_buff, dev));
6b8cc1d1 4362 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
f96da094
DB		 4363 bpf_target_off(struct net_device, ifindex, 4,
4364 target_size));
374fb54e
DB		 4365 break;
4366 default:
f96da094
DB		 4367 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4368 target_size);
374fb54e
DB		 4369 }
4370
4371 return insn - insn_buf;
4372}
4373
6b8cc1d1
DB		 4374static u32 xdp_convert_ctx_access(enum bpf_access_type type,
4375 const struct bpf_insn *si,
6a773a15 4376 struct bpf_insn *insn_buf,
f96da094 4377 struct bpf_prog *prog, u32 *target_size)
6a773a15
BB		 4378{
4379 struct bpf_insn *insn = insn_buf;
4380
6b8cc1d1 4381 switch (si->off) {
6a773a15 4382 case offsetof(struct xdp_md, data):
f035a515 4383 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
6b8cc1d1 4384 si->dst_reg, si->src_reg,
6a773a15
BB		 4385 offsetof(struct xdp_buff, data));
4386 break;
de8f3a83
DB		 4387 case offsetof(struct xdp_md, data_meta):
4388 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
4389 si->dst_reg, si->src_reg,
4390 offsetof(struct xdp_buff, data_meta));
4391 break;
6a773a15 4392 case offsetof(struct xdp_md, data_end):
f035a515 4393 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
6b8cc1d1 4394 si->dst_reg, si->src_reg,
6a773a15
BB		 4395 offsetof(struct xdp_buff, data_end));
4396 break;
02dd3291
JDB		 4397 case offsetof(struct xdp_md, ingress_ifindex):
4398 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
4399 si->dst_reg, si->src_reg,
4400 offsetof(struct xdp_buff, rxq));
4401 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
4402 si->dst_reg, si->dst_reg,
4403 offsetof(struct xdp_rxq_info, dev));
4404 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6 4405 offsetof(struct net_device, ifindex));
02dd3291
JDB		 4406 break;
4407 case offsetof(struct xdp_md, rx_queue_index):
4408 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
4409 si->dst_reg, si->src_reg,
4410 offsetof(struct xdp_buff, rxq));
4411 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
daaf24c6
JDB		 4412 offsetof(struct xdp_rxq_info,
4413 queue_index));
02dd3291 4414 break;
6a773a15
BB		 4415 }
4416
4417 return insn - insn_buf;
4418}
4419
40304b2a
LB		 4420static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
4421 const struct bpf_insn *si,
4422 struct bpf_insn *insn_buf,
f96da094
DB		 4423 struct bpf_prog *prog,
4424 u32 *target_size)
40304b2a
LB		 4425{
4426 struct bpf_insn *insn = insn_buf;
4427 int off;
4428
4429 switch (si->off) {
4430 case offsetof(struct bpf_sock_ops, op) ...
4431 offsetof(struct bpf_sock_ops, replylong[3]):
4432 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) !=
4433 FIELD_SIZEOF(struct bpf_sock_ops_kern, op));
4434 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) !=
4435 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply));
4436 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) !=
4437 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong));
4438 off = si->off;
4439 off -= offsetof(struct bpf_sock_ops, op);
4440 off += offsetof(struct bpf_sock_ops_kern, op);
4441 if (type == BPF_WRITE)
4442 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
4443 off);
4444 else
4445 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
4446 off);
4447 break;
4448
4449 case offsetof(struct bpf_sock_ops, family):
4450 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2);
4451
4452 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4453 struct bpf_sock_ops_kern, sk),
4454 si->dst_reg, si->src_reg,
4455 offsetof(struct bpf_sock_ops_kern, sk));
4456 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4457 offsetof(struct sock_common, skc_family));
4458 break;
4459
4460 case offsetof(struct bpf_sock_ops, remote_ip4):
4461 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4);
4462
4463 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4464 struct bpf_sock_ops_kern, sk),
4465 si->dst_reg, si->src_reg,
4466 offsetof(struct bpf_sock_ops_kern, sk));
4467 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4468 offsetof(struct sock_common, skc_daddr));
4469 break;
4470
4471 case offsetof(struct bpf_sock_ops, local_ip4):
4472 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_rcv_saddr) != 4);
4473
4474 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4475 struct bpf_sock_ops_kern, sk),
4476 si->dst_reg, si->src_reg,
4477 offsetof(struct bpf_sock_ops_kern, sk));
4478 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4479 offsetof(struct sock_common,
4480 skc_rcv_saddr));
4481 break;
4482
4483 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
4484 offsetof(struct bpf_sock_ops, remote_ip6[3]):
4485#if IS_ENABLED(CONFIG_IPV6)
4486 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4487 skc_v6_daddr.s6_addr32[0]) != 4);
4488
4489 off = si->off;
4490 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
4491 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4492 struct bpf_sock_ops_kern, sk),
4493 si->dst_reg, si->src_reg,
4494 offsetof(struct bpf_sock_ops_kern, sk));
4495 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4496 offsetof(struct sock_common,
4497 skc_v6_daddr.s6_addr32[0]) +
4498 off);
4499#else
4500 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4501#endif
4502 break;
4503
4504 case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
4505 offsetof(struct bpf_sock_ops, local_ip6[3]):
4506#if IS_ENABLED(CONFIG_IPV6)
4507 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common,
4508 skc_v6_rcv_saddr.s6_addr32[0]) != 4);
4509
4510 off = si->off;
4511 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
4512 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4513 struct bpf_sock_ops_kern, sk),
4514 si->dst_reg, si->src_reg,
4515 offsetof(struct bpf_sock_ops_kern, sk));
4516 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4517 offsetof(struct sock_common,
4518 skc_v6_rcv_saddr.s6_addr32[0]) +
4519 off);
4520#else
4521 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
4522#endif
4523 break;
4524
4525 case offsetof(struct bpf_sock_ops, remote_port):
4526 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2);
4527
4528 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4529 struct bpf_sock_ops_kern, sk),
4530 si->dst_reg, si->src_reg,
4531 offsetof(struct bpf_sock_ops_kern, sk));
4532 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4533 offsetof(struct sock_common, skc_dport));
4534#ifndef __BIG_ENDIAN_BITFIELD
4535 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
4536#endif
4537 break;
4538
4539 case offsetof(struct bpf_sock_ops, local_port):
4540 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2);
4541
4542 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4543 struct bpf_sock_ops_kern, sk),
4544 si->dst_reg, si->src_reg,
4545 offsetof(struct bpf_sock_ops_kern, sk));
4546 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
4547 offsetof(struct sock_common, skc_num));
4548 break;
f19397a5
LB		 4549
4550 case offsetof(struct bpf_sock_ops, is_fullsock):
4551 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4552 struct bpf_sock_ops_kern,
4553 is_fullsock),
4554 si->dst_reg, si->src_reg,
4555 offsetof(struct bpf_sock_ops_kern,
4556 is_fullsock));
4557 break;
4558
44f0e430
LB		 4559 case offsetof(struct bpf_sock_ops, state):
4560 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1);
4561
4562 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4563 struct bpf_sock_ops_kern, sk),
4564 si->dst_reg, si->src_reg,
4565 offsetof(struct bpf_sock_ops_kern, sk));
4566 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
4567 offsetof(struct sock_common, skc_state));
4568 break;
4569
4570 case offsetof(struct bpf_sock_ops, rtt_min):
4571 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) !=
4572 sizeof(struct minmax));
4573 BUILD_BUG_ON(sizeof(struct minmax) <
4574 sizeof(struct minmax_sample));
4575
4576 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
4577 struct bpf_sock_ops_kern, sk),
4578 si->dst_reg, si->src_reg,
4579 offsetof(struct bpf_sock_ops_kern, sk));
4580 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
4581 offsetof(struct tcp_sock, rtt_min) +
4582 FIELD_SIZEOF(struct minmax_sample, t));
4583 break;
4584
34d367c5
LB		 4585/* Helper macro for adding read access to tcp_sock or sock fields. */
4586#define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
f19397a5 4587 do { \
34d367c5
LB		 4588 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
4589 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
f19397a5
LB		 4590 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4591 struct bpf_sock_ops_kern, \
4592 is_fullsock), \
4593 si->dst_reg, si->src_reg, \
4594 offsetof(struct bpf_sock_ops_kern, \
4595 is_fullsock)); \
4596 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \
4597 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4598 struct bpf_sock_ops_kern, sk),\
4599 si->dst_reg, si->src_reg, \
4600 offsetof(struct bpf_sock_ops_kern, sk));\
34d367c5
LB		 4601 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \
4602 OBJ_FIELD), \
4603 si->dst_reg, si->dst_reg, \
4604 offsetof(OBJ, OBJ_FIELD)); \
f19397a5
LB		 4605 } while (0)
4606
b73042b8
LB		 4607/* Helper macro for adding write access to tcp_sock or sock fields.
4608 * The macro is called with two registers, dst_reg which contains a pointer
4609 * to ctx (context) and src_reg which contains the value that should be
4610 * stored. However, we need an additional register since we cannot overwrite
4611 * dst_reg because it may be used later in the program.
4612 * Instead we "borrow" one of the other register. We first save its value
4613 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
4614 * it at the end of the macro.
4615 */
4616#define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \
4617 do { \
4618 int reg = BPF_REG_9; \
4619 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \
4620 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \
4621 if (si->dst_reg == reg || si->src_reg == reg) \
4622 reg--; \
4623 if (si->dst_reg == reg || si->src_reg == reg) \
4624 reg--; \
4625 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \
4626 offsetof(struct bpf_sock_ops_kern, \
4627 temp)); \
4628 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4629 struct bpf_sock_ops_kern, \
4630 is_fullsock), \
4631 reg, si->dst_reg, \
4632 offsetof(struct bpf_sock_ops_kern, \
4633 is_fullsock)); \
4634 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \
4635 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \
4636 struct bpf_sock_ops_kern, sk),\
4637 reg, si->dst_reg, \
4638 offsetof(struct bpf_sock_ops_kern, sk));\
4639 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \
4640 reg, si->src_reg, \
4641 offsetof(OBJ, OBJ_FIELD)); \
4642 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \
4643 offsetof(struct bpf_sock_ops_kern, \
4644 temp)); \
4645 } while (0)
4646
4647#define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \
4648 do { \
4649 if (TYPE == BPF_WRITE) \
4650 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
4651 else \
4652 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \
4653 } while (0)
4654
f19397a5 4655 case offsetof(struct bpf_sock_ops, snd_cwnd):
34d367c5 4656 SOCK_OPS_GET_FIELD(snd_cwnd, snd_cwnd, struct tcp_sock);
f19397a5
LB		 4657 break;
4658
4659 case offsetof(struct bpf_sock_ops, srtt_us):
34d367c5 4660 SOCK_OPS_GET_FIELD(srtt_us, srtt_us, struct tcp_sock);
f19397a5 4661 break;
b13d8807
LB		 4662
4663 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
4664 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
4665 struct tcp_sock);
4666 break;
44f0e430
LB		 4667
4668 case offsetof(struct bpf_sock_ops, snd_ssthresh):
4669 SOCK_OPS_GET_FIELD(snd_ssthresh, snd_ssthresh, struct tcp_sock);
4670 break;
4671
4672 case offsetof(struct bpf_sock_ops, rcv_nxt):
4673 SOCK_OPS_GET_FIELD(rcv_nxt, rcv_nxt, struct tcp_sock);
4674 break;
4675
4676 case offsetof(struct bpf_sock_ops, snd_nxt):
4677 SOCK_OPS_GET_FIELD(snd_nxt, snd_nxt, struct tcp_sock);
4678 break;
4679
4680 case offsetof(struct bpf_sock_ops, snd_una):
4681 SOCK_OPS_GET_FIELD(snd_una, snd_una, struct tcp_sock);
4682 break;
4683
4684 case offsetof(struct bpf_sock_ops, mss_cache):
4685 SOCK_OPS_GET_FIELD(mss_cache, mss_cache, struct tcp_sock);
4686 break;
4687
4688 case offsetof(struct bpf_sock_ops, ecn_flags):
4689 SOCK_OPS_GET_FIELD(ecn_flags, ecn_flags, struct tcp_sock);
4690 break;
4691
4692 case offsetof(struct bpf_sock_ops, rate_delivered):
4693 SOCK_OPS_GET_FIELD(rate_delivered, rate_delivered,
4694 struct tcp_sock);
4695 break;
4696
4697 case offsetof(struct bpf_sock_ops, rate_interval_us):
4698 SOCK_OPS_GET_FIELD(rate_interval_us, rate_interval_us,
4699 struct tcp_sock);
4700 break;
4701
4702 case offsetof(struct bpf_sock_ops, packets_out):
4703 SOCK_OPS_GET_FIELD(packets_out, packets_out, struct tcp_sock);
4704 break;
4705
4706 case offsetof(struct bpf_sock_ops, retrans_out):
4707 SOCK_OPS_GET_FIELD(retrans_out, retrans_out, struct tcp_sock);
4708 break;
4709
4710 case offsetof(struct bpf_sock_ops, total_retrans):
4711 SOCK_OPS_GET_FIELD(total_retrans, total_retrans,
4712 struct tcp_sock);
4713 break;
4714
4715 case offsetof(struct bpf_sock_ops, segs_in):
4716 SOCK_OPS_GET_FIELD(segs_in, segs_in, struct tcp_sock);
4717 break;
4718
4719 case offsetof(struct bpf_sock_ops, data_segs_in):
4720 SOCK_OPS_GET_FIELD(data_segs_in, data_segs_in, struct tcp_sock);
4721 break;
4722
4723 case offsetof(struct bpf_sock_ops, segs_out):
4724 SOCK_OPS_GET_FIELD(segs_out, segs_out, struct tcp_sock);
4725 break;
4726
4727 case offsetof(struct bpf_sock_ops, data_segs_out):
4728 SOCK_OPS_GET_FIELD(data_segs_out, data_segs_out,
4729 struct tcp_sock);
4730 break;
4731
4732 case offsetof(struct bpf_sock_ops, lost_out):
4733 SOCK_OPS_GET_FIELD(lost_out, lost_out, struct tcp_sock);
4734 break;
4735
4736 case offsetof(struct bpf_sock_ops, sacked_out):
4737 SOCK_OPS_GET_FIELD(sacked_out, sacked_out, struct tcp_sock);
4738 break;
4739
4740 case offsetof(struct bpf_sock_ops, sk_txhash):
6f9bd3d7
LB		 4741 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
4742 struct sock, type);
44f0e430
LB		 4743 break;
4744
4745 case offsetof(struct bpf_sock_ops, bytes_received):
4746 SOCK_OPS_GET_FIELD(bytes_received, bytes_received,
4747 struct tcp_sock);
4748 break;
4749
4750 case offsetof(struct bpf_sock_ops, bytes_acked):
4751 SOCK_OPS_GET_FIELD(bytes_acked, bytes_acked, struct tcp_sock);
4752 break;
6f9bd3d7 4753
40304b2a
LB		 4754 }
4755 return insn - insn_buf;
4756}
4757
8108a775
JF		 4758static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
4759 const struct bpf_insn *si,
4760 struct bpf_insn *insn_buf,
4761 struct bpf_prog *prog, u32 *target_size)
4762{
4763 struct bpf_insn *insn = insn_buf;
4764 int off;
4765
4766 switch (si->off) {
4767 case offsetof(struct __sk_buff, data_end):
4768 off = si->off;
4769 off -= offsetof(struct __sk_buff, data_end);
4770 off += offsetof(struct sk_buff, cb);
4771 off += offsetof(struct tcp_skb_cb, bpf.data_end);
4772 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
4773 si->src_reg, off);
4774 break;
4775 default:
4776 return bpf_convert_ctx_access(type, si, insn_buf, prog,
4777 target_size);
4778 }
4779
4780 return insn - insn_buf;
4781}
4782
7de16e3a 4783const struct bpf_verifier_ops sk_filter_verifier_ops = {
4936e352
DB		 4784 .get_func_proto = sk_filter_func_proto,
4785 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 4786 .convert_ctx_access = bpf_convert_ctx_access,
89aa0758
AS		 4787};
4788
7de16e3a 4789const struct bpf_prog_ops sk_filter_prog_ops = {
61f3c964 4790 .test_run = bpf_prog_test_run_skb,
7de16e3a
JK		 4791};
4792
4793const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
4936e352
DB		 4794 .get_func_proto = tc_cls_act_func_proto,
4795 .is_valid_access = tc_cls_act_is_valid_access,
374fb54e 4796 .convert_ctx_access = tc_cls_act_convert_ctx_access,
36bbef52 4797 .gen_prologue = tc_cls_act_prologue,
7de16e3a
JK		 4798};
4799
4800const struct bpf_prog_ops tc_cls_act_prog_ops = {
1cf1cae9 4801 .test_run = bpf_prog_test_run_skb,
608cd71a
AS		 4802};
4803
7de16e3a 4804const struct bpf_verifier_ops xdp_verifier_ops = {
6a773a15
BB		 4805 .get_func_proto = xdp_func_proto,
4806 .is_valid_access = xdp_is_valid_access,
4807 .convert_ctx_access = xdp_convert_ctx_access,
7de16e3a
JK		 4808};
4809
4810const struct bpf_prog_ops xdp_prog_ops = {
1cf1cae9 4811 .test_run = bpf_prog_test_run_xdp,
6a773a15
BB		 4812};
4813
7de16e3a 4814const struct bpf_verifier_ops cg_skb_verifier_ops = {
966789fb 4815 .get_func_proto = sk_filter_func_proto,
0e33661d 4816 .is_valid_access = sk_filter_is_valid_access,
2492d3b8 4817 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 4818};
4819
4820const struct bpf_prog_ops cg_skb_prog_ops = {
1cf1cae9 4821 .test_run = bpf_prog_test_run_skb,
0e33661d
DM		 4822};
4823
7de16e3a 4824const struct bpf_verifier_ops lwt_inout_verifier_ops = {
3a0af8fd
TG		 4825 .get_func_proto = lwt_inout_func_proto,
4826 .is_valid_access = lwt_is_valid_access,
2492d3b8 4827 .convert_ctx_access = bpf_convert_ctx_access,
7de16e3a
JK		 4828};
4829
4830const struct bpf_prog_ops lwt_inout_prog_ops = {
1cf1cae9 4831 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 4832};
4833
7de16e3a 4834const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
3a0af8fd
TG		 4835 .get_func_proto = lwt_xmit_func_proto,
4836 .is_valid_access = lwt_is_valid_access,
2492d3b8 4837 .convert_ctx_access = bpf_convert_ctx_access,
3a0af8fd 4838 .gen_prologue = tc_cls_act_prologue,
7de16e3a
JK		 4839};
4840
4841const struct bpf_prog_ops lwt_xmit_prog_ops = {
1cf1cae9 4842 .test_run = bpf_prog_test_run_skb,
3a0af8fd
TG		 4843};
4844
7de16e3a 4845const struct bpf_verifier_ops cg_sock_verifier_ops = {
ae2cf1c4 4846 .get_func_proto = sock_filter_func_proto,
61023658
DA		 4847 .is_valid_access = sock_filter_is_valid_access,
4848 .convert_ctx_access = sock_filter_convert_ctx_access,
4849};
4850
7de16e3a
JK		 4851const struct bpf_prog_ops cg_sock_prog_ops = {
4852};
4853
4854const struct bpf_verifier_ops sock_ops_verifier_ops = {
8c4b4c7e 4855 .get_func_proto = sock_ops_func_proto,
40304b2a
LB		 4856 .is_valid_access = sock_ops_is_valid_access,
4857 .convert_ctx_access = sock_ops_convert_ctx_access,
4858};
4859
7de16e3a
JK		 4860const struct bpf_prog_ops sock_ops_prog_ops = {
4861};
4862
4863const struct bpf_verifier_ops sk_skb_verifier_ops = {
b005fd18
JF		 4864 .get_func_proto = sk_skb_func_proto,
4865 .is_valid_access = sk_skb_is_valid_access,
8108a775 4866 .convert_ctx_access = sk_skb_convert_ctx_access,
8a31db56 4867 .gen_prologue = sk_skb_prologue,
b005fd18
JF		 4868};
4869
7de16e3a
JK		 4870const struct bpf_prog_ops sk_skb_prog_ops = {
4871};
4872
8ced425e 4873int sk_detach_filter(struct sock *sk)
55b33325
PE		 4874{
4875 int ret = -ENOENT;
4876 struct sk_filter *filter;
4877
d59577b6
VB		 4878 if (sock_flag(sk, SOCK_FILTER_LOCKED))
4879 return -EPERM;
4880
8ced425e
HFS		 4881 filter = rcu_dereference_protected(sk->sk_filter,
4882 lockdep_sock_is_held(sk));
55b33325 4883 if (filter) {
a9b3cd7f 4884 RCU_INIT_POINTER(sk->sk_filter, NULL);
46bcf14f 4885 sk_filter_uncharge(sk, filter);
55b33325
PE		 4886 ret = 0;
4887 }
a3ea269b 4888
55b33325
PE		 4889 return ret;
4890}
8ced425e 4891EXPORT_SYMBOL_GPL(sk_detach_filter);
a8fc9277 4892
a3ea269b
DB		 4893int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
4894 unsigned int len)
a8fc9277 4895{
a3ea269b 4896 struct sock_fprog_kern *fprog;
a8fc9277 4897 struct sk_filter *filter;
a3ea269b 4898 int ret = 0;
a8fc9277
PE		 4899
4900 lock_sock(sk);
4901 filter = rcu_dereference_protected(sk->sk_filter,
8ced425e 4902 lockdep_sock_is_held(sk));
a8fc9277
PE		 4903 if (!filter)
4904 goto out;
a3ea269b
DB		 4905
4906 /* We're copying the filter that has been originally attached,
93d08b69
DB		 4907 * so no conversion/decode needed anymore. eBPF programs that
4908 * have no original program cannot be dumped through this.
a3ea269b 4909 */
93d08b69 4910 ret = -EACCES;
7ae457c1 4911 fprog = filter->prog->orig_prog;
93d08b69
DB		 4912 if (!fprog)
4913 goto out;
a3ea269b
DB		 4914
4915 ret = fprog->len;
a8fc9277 4916 if (!len)
a3ea269b 4917 /* User space only enquires number of filter blocks. */
a8fc9277 4918 goto out;
a3ea269b 4919
a8fc9277 4920 ret = -EINVAL;
a3ea269b 4921 if (len < fprog->len)
a8fc9277
PE		 4922 goto out;
4923
4924 ret = -EFAULT;
009937e7 4925 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
a3ea269b 4926 goto out;
a8fc9277 4927
a3ea269b
DB		 4928 /* Instead of bytes, the API requests to return the number
4929 * of filter blocks.
4930 */
4931 ret = fprog->len;
a8fc9277
PE		 4932out:
4933 release_sock(sk);
4934 return ret;
4935}
Linux 6.x block layer and io_uring tree(s)