1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux Socket Filter - Kernel level socket filtering 4 * 5 * Based on the design of the Berkeley Packet Filter. The new 6 * internal format has been designed by PLUMgrid: 7 * 8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com 9 * 10 * Authors: 11 * 12 * Jay Schulist <jschlst@samba.org> 13 * Alexei Starovoitov <ast@plumgrid.com> 14 * Daniel Borkmann <dborkman@redhat.com> 15 * 16 * Andi Kleen - Fix a few bad bugs and races. 17 * Kris Katterjohn - Added many additional checks in bpf_check_classic() 18 */ 19 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/mm.h> 23 #include <linux/fcntl.h> 24 #include <linux/socket.h> 25 #include <linux/sock_diag.h> 26 #include <linux/in.h> 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_packet.h> 30 #include <linux/if_arp.h> 31 #include <linux/gfp.h> 32 #include <net/inet_common.h> 33 #include <net/ip.h> 34 #include <net/protocol.h> 35 #include <net/netlink.h> 36 #include <linux/skbuff.h> 37 #include <linux/skmsg.h> 38 #include <net/sock.h> 39 #include <net/flow_dissector.h> 40 #include <linux/errno.h> 41 #include <linux/timer.h> 42 #include <linux/uaccess.h> 43 #include <asm/unaligned.h> 44 #include <asm/cmpxchg.h> 45 #include <linux/filter.h> 46 #include <linux/ratelimit.h> 47 #include <linux/seccomp.h> 48 #include <linux/if_vlan.h> 49 #include <linux/bpf.h> 50 #include <net/sch_generic.h> 51 #include <net/cls_cgroup.h> 52 #include <net/dst_metadata.h> 53 #include <net/dst.h> 54 #include <net/sock_reuseport.h> 55 #include <net/busy_poll.h> 56 #include <net/tcp.h> 57 #include <net/xfrm.h> 58 #include <net/udp.h> 59 #include <linux/bpf_trace.h> 60 #include <net/xdp_sock.h> 61 #include <linux/inetdevice.h> 62 #include <net/inet_hashtables.h> 63 #include <net/inet6_hashtables.h> 64 #include <net/ip_fib.h> 65 #include <net/nexthop.h> 66 #include <net/flow.h> 67 #include <net/arp.h> 68 #include <net/ipv6.h> 69 #include <net/net_namespace.h> 70 #include <linux/seg6_local.h> 71 #include <net/seg6.h> 72 #include <net/seg6_local.h> 73 #include <net/lwtunnel.h> 74 #include <net/ipv6_stubs.h> 75 #include <net/bpf_sk_storage.h> 76 77 /** 78 * sk_filter_trim_cap - run a packet through a socket filter 79 * @sk: sock associated with &sk_buff 80 * @skb: buffer to filter 81 * @cap: limit on how short the eBPF program may trim the packet 82 * 83 * Run the eBPF program and then cut skb->data to correct size returned by 84 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 85 * than pkt_len we keep whole skb->data. This is the socket level 86 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should 87 * be accepted or -EPERM if the packet should be tossed. 88 * 89 */ 90 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 91 { 92 int err; 93 struct sk_filter *filter; 94 95 /* 96 * If the skb was allocated from pfmemalloc reserves, only 97 * allow SOCK_MEMALLOC sockets to use it as this socket is 98 * helping free memory 99 */ 100 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 101 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 102 return -ENOMEM; 103 } 104 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 105 if (err) 106 return err; 107 108 err = security_sock_rcv_skb(sk, skb); 109 if (err) 110 return err; 111 112 rcu_read_lock(); 113 filter = rcu_dereference(sk->sk_filter); 114 if (filter) { 115 struct sock *save_sk = skb->sk; 116 unsigned int pkt_len; 117 118 skb->sk = sk; 119 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 120 skb->sk = save_sk; 121 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 122 } 123 rcu_read_unlock(); 124 125 return err; 126 } 127 EXPORT_SYMBOL(sk_filter_trim_cap); 128 129 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 130 { 131 return skb_get_poff(skb); 132 } 133 134 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 135 { 136 struct nlattr *nla; 137 138 if (skb_is_nonlinear(skb)) 139 return 0; 140 141 if (skb->len < sizeof(struct nlattr)) 142 return 0; 143 144 if (a > skb->len - sizeof(struct nlattr)) 145 return 0; 146 147 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 148 if (nla) 149 return (void *) nla - (void *) skb->data; 150 151 return 0; 152 } 153 154 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 155 { 156 struct nlattr *nla; 157 158 if (skb_is_nonlinear(skb)) 159 return 0; 160 161 if (skb->len < sizeof(struct nlattr)) 162 return 0; 163 164 if (a > skb->len - sizeof(struct nlattr)) 165 return 0; 166 167 nla = (struct nlattr *) &skb->data[a]; 168 if (nla->nla_len > skb->len - a) 169 return 0; 170 171 nla = nla_find_nested(nla, x); 172 if (nla) 173 return (void *) nla - (void *) skb->data; 174 175 return 0; 176 } 177 178 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 179 data, int, headlen, int, offset) 180 { 181 u8 tmp, *ptr; 182 const int len = sizeof(tmp); 183 184 if (offset >= 0) { 185 if (headlen - offset >= len) 186 return *(u8 *)(data + offset); 187 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 188 return tmp; 189 } else { 190 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 191 if (likely(ptr)) 192 return *(u8 *)ptr; 193 } 194 195 return -EFAULT; 196 } 197 198 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 199 int, offset) 200 { 201 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 202 offset); 203 } 204 205 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 206 data, int, headlen, int, offset) 207 { 208 u16 tmp, *ptr; 209 const int len = sizeof(tmp); 210 211 if (offset >= 0) { 212 if (headlen - offset >= len) 213 return get_unaligned_be16(data + offset); 214 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 215 return be16_to_cpu(tmp); 216 } else { 217 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 218 if (likely(ptr)) 219 return get_unaligned_be16(ptr); 220 } 221 222 return -EFAULT; 223 } 224 225 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 226 int, offset) 227 { 228 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 229 offset); 230 } 231 232 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 233 data, int, headlen, int, offset) 234 { 235 u32 tmp, *ptr; 236 const int len = sizeof(tmp); 237 238 if (likely(offset >= 0)) { 239 if (headlen - offset >= len) 240 return get_unaligned_be32(data + offset); 241 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 242 return be32_to_cpu(tmp); 243 } else { 244 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 245 if (likely(ptr)) 246 return get_unaligned_be32(ptr); 247 } 248 249 return -EFAULT; 250 } 251 252 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 253 int, offset) 254 { 255 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 256 offset); 257 } 258 259 BPF_CALL_0(bpf_get_raw_cpu_id) 260 { 261 return raw_smp_processor_id(); 262 } 263 264 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { 265 .func = bpf_get_raw_cpu_id, 266 .gpl_only = false, 267 .ret_type = RET_INTEGER, 268 }; 269 270 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 271 struct bpf_insn *insn_buf) 272 { 273 struct bpf_insn *insn = insn_buf; 274 275 switch (skb_field) { 276 case SKF_AD_MARK: 277 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4); 278 279 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 280 offsetof(struct sk_buff, mark)); 281 break; 282 283 case SKF_AD_PKTTYPE: 284 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); 285 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 286 #ifdef __BIG_ENDIAN_BITFIELD 287 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 288 #endif 289 break; 290 291 case SKF_AD_QUEUE: 292 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, queue_mapping) != 2); 293 294 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 295 offsetof(struct sk_buff, queue_mapping)); 296 break; 297 298 case SKF_AD_VLAN_TAG: 299 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2); 300 301 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 302 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 303 offsetof(struct sk_buff, vlan_tci)); 304 break; 305 case SKF_AD_VLAN_TAG_PRESENT: 306 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); 307 if (PKT_VLAN_PRESENT_BIT) 308 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); 309 if (PKT_VLAN_PRESENT_BIT < 7) 310 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); 311 break; 312 } 313 314 return insn - insn_buf; 315 } 316 317 static bool convert_bpf_extensions(struct sock_filter *fp, 318 struct bpf_insn **insnp) 319 { 320 struct bpf_insn *insn = *insnp; 321 u32 cnt; 322 323 switch (fp->k) { 324 case SKF_AD_OFF + SKF_AD_PROTOCOL: 325 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, protocol) != 2); 326 327 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 328 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 329 offsetof(struct sk_buff, protocol)); 330 /* A = ntohs(A) [emitting a nop or swap16] */ 331 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 332 break; 333 334 case SKF_AD_OFF + SKF_AD_PKTTYPE: 335 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 336 insn += cnt - 1; 337 break; 338 339 case SKF_AD_OFF + SKF_AD_IFINDEX: 340 case SKF_AD_OFF + SKF_AD_HATYPE: 341 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4); 342 BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2); 343 344 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 345 BPF_REG_TMP, BPF_REG_CTX, 346 offsetof(struct sk_buff, dev)); 347 /* if (tmp != 0) goto pc + 1 */ 348 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 349 *insn++ = BPF_EXIT_INSN(); 350 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 351 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 352 offsetof(struct net_device, ifindex)); 353 else 354 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 355 offsetof(struct net_device, type)); 356 break; 357 358 case SKF_AD_OFF + SKF_AD_MARK: 359 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 360 insn += cnt - 1; 361 break; 362 363 case SKF_AD_OFF + SKF_AD_RXHASH: 364 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4); 365 366 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 367 offsetof(struct sk_buff, hash)); 368 break; 369 370 case SKF_AD_OFF + SKF_AD_QUEUE: 371 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 372 insn += cnt - 1; 373 break; 374 375 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 376 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 377 BPF_REG_A, BPF_REG_CTX, insn); 378 insn += cnt - 1; 379 break; 380 381 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 382 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 383 BPF_REG_A, BPF_REG_CTX, insn); 384 insn += cnt - 1; 385 break; 386 387 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 388 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_proto) != 2); 389 390 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 391 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 392 offsetof(struct sk_buff, vlan_proto)); 393 /* A = ntohs(A) [emitting a nop or swap16] */ 394 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 395 break; 396 397 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 398 case SKF_AD_OFF + SKF_AD_NLATTR: 399 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 400 case SKF_AD_OFF + SKF_AD_CPU: 401 case SKF_AD_OFF + SKF_AD_RANDOM: 402 /* arg1 = CTX */ 403 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 404 /* arg2 = A */ 405 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 406 /* arg3 = X */ 407 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 408 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 409 switch (fp->k) { 410 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 411 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 412 break; 413 case SKF_AD_OFF + SKF_AD_NLATTR: 414 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 415 break; 416 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 417 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 418 break; 419 case SKF_AD_OFF + SKF_AD_CPU: 420 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 421 break; 422 case SKF_AD_OFF + SKF_AD_RANDOM: 423 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 424 bpf_user_rnd_init_once(); 425 break; 426 } 427 break; 428 429 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 430 /* A ^= X */ 431 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 432 break; 433 434 default: 435 /* This is just a dummy call to avoid letting the compiler 436 * evict __bpf_call_base() as an optimization. Placed here 437 * where no-one bothers. 438 */ 439 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 440 return false; 441 } 442 443 *insnp = insn; 444 return true; 445 } 446 447 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 448 { 449 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 450 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 451 bool endian = BPF_SIZE(fp->code) == BPF_H || 452 BPF_SIZE(fp->code) == BPF_W; 453 bool indirect = BPF_MODE(fp->code) == BPF_IND; 454 const int ip_align = NET_IP_ALIGN; 455 struct bpf_insn *insn = *insnp; 456 int offset = fp->k; 457 458 if (!indirect && 459 ((unaligned_ok && offset >= 0) || 460 (!unaligned_ok && offset >= 0 && 461 offset + ip_align >= 0 && 462 offset + ip_align % size == 0))) { 463 bool ldx_off_ok = offset <= S16_MAX; 464 465 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 466 if (offset) 467 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 468 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 469 size, 2 + endian + (!ldx_off_ok * 2)); 470 if (ldx_off_ok) { 471 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 472 BPF_REG_D, offset); 473 } else { 474 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 475 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 476 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 477 BPF_REG_TMP, 0); 478 } 479 if (endian) 480 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 481 *insn++ = BPF_JMP_A(8); 482 } 483 484 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 485 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 486 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 487 if (!indirect) { 488 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 489 } else { 490 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 491 if (fp->k) 492 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 493 } 494 495 switch (BPF_SIZE(fp->code)) { 496 case BPF_B: 497 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 498 break; 499 case BPF_H: 500 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 501 break; 502 case BPF_W: 503 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 504 break; 505 default: 506 return false; 507 } 508 509 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 510 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 511 *insn = BPF_EXIT_INSN(); 512 513 *insnp = insn; 514 return true; 515 } 516 517 /** 518 * bpf_convert_filter - convert filter program 519 * @prog: the user passed filter program 520 * @len: the length of the user passed filter program 521 * @new_prog: allocated 'struct bpf_prog' or NULL 522 * @new_len: pointer to store length of converted program 523 * @seen_ld_abs: bool whether we've seen ld_abs/ind 524 * 525 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 526 * style extended BPF (eBPF). 527 * Conversion workflow: 528 * 529 * 1) First pass for calculating the new program length: 530 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 531 * 532 * 2) 2nd pass to remap in two passes: 1st pass finds new 533 * jump offsets, 2nd pass remapping: 534 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 535 */ 536 static int bpf_convert_filter(struct sock_filter *prog, int len, 537 struct bpf_prog *new_prog, int *new_len, 538 bool *seen_ld_abs) 539 { 540 int new_flen = 0, pass = 0, target, i, stack_off; 541 struct bpf_insn *new_insn, *first_insn = NULL; 542 struct sock_filter *fp; 543 int *addrs = NULL; 544 u8 bpf_src; 545 546 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 547 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 548 549 if (len <= 0 || len > BPF_MAXINSNS) 550 return -EINVAL; 551 552 if (new_prog) { 553 first_insn = new_prog->insnsi; 554 addrs = kcalloc(len, sizeof(*addrs), 555 GFP_KERNEL | __GFP_NOWARN); 556 if (!addrs) 557 return -ENOMEM; 558 } 559 560 do_pass: 561 new_insn = first_insn; 562 fp = prog; 563 564 /* Classic BPF related prologue emission. */ 565 if (new_prog) { 566 /* Classic BPF expects A and X to be reset first. These need 567 * to be guaranteed to be the first two instructions. 568 */ 569 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 570 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 571 572 /* All programs must keep CTX in callee saved BPF_REG_CTX. 573 * In eBPF case it's done by the compiler, here we need to 574 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 575 */ 576 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 577 if (*seen_ld_abs) { 578 /* For packet access in classic BPF, cache skb->data 579 * in callee-saved BPF R8 and skb->len - skb->data_len 580 * (headlen) in BPF R9. Since classic BPF is read-only 581 * on CTX, we only need to cache it once. 582 */ 583 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 584 BPF_REG_D, BPF_REG_CTX, 585 offsetof(struct sk_buff, data)); 586 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 587 offsetof(struct sk_buff, len)); 588 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 589 offsetof(struct sk_buff, data_len)); 590 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 591 } 592 } else { 593 new_insn += 3; 594 } 595 596 for (i = 0; i < len; fp++, i++) { 597 struct bpf_insn tmp_insns[32] = { }; 598 struct bpf_insn *insn = tmp_insns; 599 600 if (addrs) 601 addrs[i] = new_insn - first_insn; 602 603 switch (fp->code) { 604 /* All arithmetic insns and skb loads map as-is. */ 605 case BPF_ALU | BPF_ADD | BPF_X: 606 case BPF_ALU | BPF_ADD | BPF_K: 607 case BPF_ALU | BPF_SUB | BPF_X: 608 case BPF_ALU | BPF_SUB | BPF_K: 609 case BPF_ALU | BPF_AND | BPF_X: 610 case BPF_ALU | BPF_AND | BPF_K: 611 case BPF_ALU | BPF_OR | BPF_X: 612 case BPF_ALU | BPF_OR | BPF_K: 613 case BPF_ALU | BPF_LSH | BPF_X: 614 case BPF_ALU | BPF_LSH | BPF_K: 615 case BPF_ALU | BPF_RSH | BPF_X: 616 case BPF_ALU | BPF_RSH | BPF_K: 617 case BPF_ALU | BPF_XOR | BPF_X: 618 case BPF_ALU | BPF_XOR | BPF_K: 619 case BPF_ALU | BPF_MUL | BPF_X: 620 case BPF_ALU | BPF_MUL | BPF_K: 621 case BPF_ALU | BPF_DIV | BPF_X: 622 case BPF_ALU | BPF_DIV | BPF_K: 623 case BPF_ALU | BPF_MOD | BPF_X: 624 case BPF_ALU | BPF_MOD | BPF_K: 625 case BPF_ALU | BPF_NEG: 626 case BPF_LD | BPF_ABS | BPF_W: 627 case BPF_LD | BPF_ABS | BPF_H: 628 case BPF_LD | BPF_ABS | BPF_B: 629 case BPF_LD | BPF_IND | BPF_W: 630 case BPF_LD | BPF_IND | BPF_H: 631 case BPF_LD | BPF_IND | BPF_B: 632 /* Check for overloaded BPF extension and 633 * directly convert it if found, otherwise 634 * just move on with mapping. 635 */ 636 if (BPF_CLASS(fp->code) == BPF_LD && 637 BPF_MODE(fp->code) == BPF_ABS && 638 convert_bpf_extensions(fp, &insn)) 639 break; 640 if (BPF_CLASS(fp->code) == BPF_LD && 641 convert_bpf_ld_abs(fp, &insn)) { 642 *seen_ld_abs = true; 643 break; 644 } 645 646 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 647 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 648 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 649 /* Error with exception code on div/mod by 0. 650 * For cBPF programs, this was always return 0. 651 */ 652 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 653 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 654 *insn++ = BPF_EXIT_INSN(); 655 } 656 657 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 658 break; 659 660 /* Jump transformation cannot use BPF block macros 661 * everywhere as offset calculation and target updates 662 * require a bit more work than the rest, i.e. jump 663 * opcodes map as-is, but offsets need adjustment. 664 */ 665 666 #define BPF_EMIT_JMP \ 667 do { \ 668 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 669 s32 off; \ 670 \ 671 if (target >= len || target < 0) \ 672 goto err; \ 673 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 674 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 675 off -= insn - tmp_insns; \ 676 /* Reject anything not fitting into insn->off. */ \ 677 if (off < off_min || off > off_max) \ 678 goto err; \ 679 insn->off = off; \ 680 } while (0) 681 682 case BPF_JMP | BPF_JA: 683 target = i + fp->k + 1; 684 insn->code = fp->code; 685 BPF_EMIT_JMP; 686 break; 687 688 case BPF_JMP | BPF_JEQ | BPF_K: 689 case BPF_JMP | BPF_JEQ | BPF_X: 690 case BPF_JMP | BPF_JSET | BPF_K: 691 case BPF_JMP | BPF_JSET | BPF_X: 692 case BPF_JMP | BPF_JGT | BPF_K: 693 case BPF_JMP | BPF_JGT | BPF_X: 694 case BPF_JMP | BPF_JGE | BPF_K: 695 case BPF_JMP | BPF_JGE | BPF_X: 696 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 697 /* BPF immediates are signed, zero extend 698 * immediate into tmp register and use it 699 * in compare insn. 700 */ 701 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 702 703 insn->dst_reg = BPF_REG_A; 704 insn->src_reg = BPF_REG_TMP; 705 bpf_src = BPF_X; 706 } else { 707 insn->dst_reg = BPF_REG_A; 708 insn->imm = fp->k; 709 bpf_src = BPF_SRC(fp->code); 710 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 711 } 712 713 /* Common case where 'jump_false' is next insn. */ 714 if (fp->jf == 0) { 715 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 716 target = i + fp->jt + 1; 717 BPF_EMIT_JMP; 718 break; 719 } 720 721 /* Convert some jumps when 'jump_true' is next insn. */ 722 if (fp->jt == 0) { 723 switch (BPF_OP(fp->code)) { 724 case BPF_JEQ: 725 insn->code = BPF_JMP | BPF_JNE | bpf_src; 726 break; 727 case BPF_JGT: 728 insn->code = BPF_JMP | BPF_JLE | bpf_src; 729 break; 730 case BPF_JGE: 731 insn->code = BPF_JMP | BPF_JLT | bpf_src; 732 break; 733 default: 734 goto jmp_rest; 735 } 736 737 target = i + fp->jf + 1; 738 BPF_EMIT_JMP; 739 break; 740 } 741 jmp_rest: 742 /* Other jumps are mapped into two insns: Jxx and JA. */ 743 target = i + fp->jt + 1; 744 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 745 BPF_EMIT_JMP; 746 insn++; 747 748 insn->code = BPF_JMP | BPF_JA; 749 target = i + fp->jf + 1; 750 BPF_EMIT_JMP; 751 break; 752 753 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 754 case BPF_LDX | BPF_MSH | BPF_B: { 755 struct sock_filter tmp = { 756 .code = BPF_LD | BPF_ABS | BPF_B, 757 .k = fp->k, 758 }; 759 760 *seen_ld_abs = true; 761 762 /* X = A */ 763 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 764 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 765 convert_bpf_ld_abs(&tmp, &insn); 766 insn++; 767 /* A &= 0xf */ 768 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 769 /* A <<= 2 */ 770 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 771 /* tmp = X */ 772 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 773 /* X = A */ 774 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 775 /* A = tmp */ 776 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 777 break; 778 } 779 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 780 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 781 */ 782 case BPF_RET | BPF_A: 783 case BPF_RET | BPF_K: 784 if (BPF_RVAL(fp->code) == BPF_K) 785 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 786 0, fp->k); 787 *insn = BPF_EXIT_INSN(); 788 break; 789 790 /* Store to stack. */ 791 case BPF_ST: 792 case BPF_STX: 793 stack_off = fp->k * 4 + 4; 794 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 795 BPF_ST ? BPF_REG_A : BPF_REG_X, 796 -stack_off); 797 /* check_load_and_stores() verifies that classic BPF can 798 * load from stack only after write, so tracking 799 * stack_depth for ST|STX insns is enough 800 */ 801 if (new_prog && new_prog->aux->stack_depth < stack_off) 802 new_prog->aux->stack_depth = stack_off; 803 break; 804 805 /* Load from stack. */ 806 case BPF_LD | BPF_MEM: 807 case BPF_LDX | BPF_MEM: 808 stack_off = fp->k * 4 + 4; 809 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 810 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 811 -stack_off); 812 break; 813 814 /* A = K or X = K */ 815 case BPF_LD | BPF_IMM: 816 case BPF_LDX | BPF_IMM: 817 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 818 BPF_REG_A : BPF_REG_X, fp->k); 819 break; 820 821 /* X = A */ 822 case BPF_MISC | BPF_TAX: 823 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 824 break; 825 826 /* A = X */ 827 case BPF_MISC | BPF_TXA: 828 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 829 break; 830 831 /* A = skb->len or X = skb->len */ 832 case BPF_LD | BPF_W | BPF_LEN: 833 case BPF_LDX | BPF_W | BPF_LEN: 834 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 835 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 836 offsetof(struct sk_buff, len)); 837 break; 838 839 /* Access seccomp_data fields. */ 840 case BPF_LDX | BPF_ABS | BPF_W: 841 /* A = *(u32 *) (ctx + K) */ 842 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 843 break; 844 845 /* Unknown instruction. */ 846 default: 847 goto err; 848 } 849 850 insn++; 851 if (new_prog) 852 memcpy(new_insn, tmp_insns, 853 sizeof(*insn) * (insn - tmp_insns)); 854 new_insn += insn - tmp_insns; 855 } 856 857 if (!new_prog) { 858 /* Only calculating new length. */ 859 *new_len = new_insn - first_insn; 860 if (*seen_ld_abs) 861 *new_len += 4; /* Prologue bits. */ 862 return 0; 863 } 864 865 pass++; 866 if (new_flen != new_insn - first_insn) { 867 new_flen = new_insn - first_insn; 868 if (pass > 2) 869 goto err; 870 goto do_pass; 871 } 872 873 kfree(addrs); 874 BUG_ON(*new_len != new_flen); 875 return 0; 876 err: 877 kfree(addrs); 878 return -EINVAL; 879 } 880 881 /* Security: 882 * 883 * As we dont want to clear mem[] array for each packet going through 884 * __bpf_prog_run(), we check that filter loaded by user never try to read 885 * a cell if not previously written, and we check all branches to be sure 886 * a malicious user doesn't try to abuse us. 887 */ 888 static int check_load_and_stores(const struct sock_filter *filter, int flen) 889 { 890 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 891 int pc, ret = 0; 892 893 BUILD_BUG_ON(BPF_MEMWORDS > 16); 894 895 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 896 if (!masks) 897 return -ENOMEM; 898 899 memset(masks, 0xff, flen * sizeof(*masks)); 900 901 for (pc = 0; pc < flen; pc++) { 902 memvalid &= masks[pc]; 903 904 switch (filter[pc].code) { 905 case BPF_ST: 906 case BPF_STX: 907 memvalid |= (1 << filter[pc].k); 908 break; 909 case BPF_LD | BPF_MEM: 910 case BPF_LDX | BPF_MEM: 911 if (!(memvalid & (1 << filter[pc].k))) { 912 ret = -EINVAL; 913 goto error; 914 } 915 break; 916 case BPF_JMP | BPF_JA: 917 /* A jump must set masks on target */ 918 masks[pc + 1 + filter[pc].k] &= memvalid; 919 memvalid = ~0; 920 break; 921 case BPF_JMP | BPF_JEQ | BPF_K: 922 case BPF_JMP | BPF_JEQ | BPF_X: 923 case BPF_JMP | BPF_JGE | BPF_K: 924 case BPF_JMP | BPF_JGE | BPF_X: 925 case BPF_JMP | BPF_JGT | BPF_K: 926 case BPF_JMP | BPF_JGT | BPF_X: 927 case BPF_JMP | BPF_JSET | BPF_K: 928 case BPF_JMP | BPF_JSET | BPF_X: 929 /* A jump must set masks on targets */ 930 masks[pc + 1 + filter[pc].jt] &= memvalid; 931 masks[pc + 1 + filter[pc].jf] &= memvalid; 932 memvalid = ~0; 933 break; 934 } 935 } 936 error: 937 kfree(masks); 938 return ret; 939 } 940 941 static bool chk_code_allowed(u16 code_to_probe) 942 { 943 static const bool codes[] = { 944 /* 32 bit ALU operations */ 945 [BPF_ALU | BPF_ADD | BPF_K] = true, 946 [BPF_ALU | BPF_ADD | BPF_X] = true, 947 [BPF_ALU | BPF_SUB | BPF_K] = true, 948 [BPF_ALU | BPF_SUB | BPF_X] = true, 949 [BPF_ALU | BPF_MUL | BPF_K] = true, 950 [BPF_ALU | BPF_MUL | BPF_X] = true, 951 [BPF_ALU | BPF_DIV | BPF_K] = true, 952 [BPF_ALU | BPF_DIV | BPF_X] = true, 953 [BPF_ALU | BPF_MOD | BPF_K] = true, 954 [BPF_ALU | BPF_MOD | BPF_X] = true, 955 [BPF_ALU | BPF_AND | BPF_K] = true, 956 [BPF_ALU | BPF_AND | BPF_X] = true, 957 [BPF_ALU | BPF_OR | BPF_K] = true, 958 [BPF_ALU | BPF_OR | BPF_X] = true, 959 [BPF_ALU | BPF_XOR | BPF_K] = true, 960 [BPF_ALU | BPF_XOR | BPF_X] = true, 961 [BPF_ALU | BPF_LSH | BPF_K] = true, 962 [BPF_ALU | BPF_LSH | BPF_X] = true, 963 [BPF_ALU | BPF_RSH | BPF_K] = true, 964 [BPF_ALU | BPF_RSH | BPF_X] = true, 965 [BPF_ALU | BPF_NEG] = true, 966 /* Load instructions */ 967 [BPF_LD | BPF_W | BPF_ABS] = true, 968 [BPF_LD | BPF_H | BPF_ABS] = true, 969 [BPF_LD | BPF_B | BPF_ABS] = true, 970 [BPF_LD | BPF_W | BPF_LEN] = true, 971 [BPF_LD | BPF_W | BPF_IND] = true, 972 [BPF_LD | BPF_H | BPF_IND] = true, 973 [BPF_LD | BPF_B | BPF_IND] = true, 974 [BPF_LD | BPF_IMM] = true, 975 [BPF_LD | BPF_MEM] = true, 976 [BPF_LDX | BPF_W | BPF_LEN] = true, 977 [BPF_LDX | BPF_B | BPF_MSH] = true, 978 [BPF_LDX | BPF_IMM] = true, 979 [BPF_LDX | BPF_MEM] = true, 980 /* Store instructions */ 981 [BPF_ST] = true, 982 [BPF_STX] = true, 983 /* Misc instructions */ 984 [BPF_MISC | BPF_TAX] = true, 985 [BPF_MISC | BPF_TXA] = true, 986 /* Return instructions */ 987 [BPF_RET | BPF_K] = true, 988 [BPF_RET | BPF_A] = true, 989 /* Jump instructions */ 990 [BPF_JMP | BPF_JA] = true, 991 [BPF_JMP | BPF_JEQ | BPF_K] = true, 992 [BPF_JMP | BPF_JEQ | BPF_X] = true, 993 [BPF_JMP | BPF_JGE | BPF_K] = true, 994 [BPF_JMP | BPF_JGE | BPF_X] = true, 995 [BPF_JMP | BPF_JGT | BPF_K] = true, 996 [BPF_JMP | BPF_JGT | BPF_X] = true, 997 [BPF_JMP | BPF_JSET | BPF_K] = true, 998 [BPF_JMP | BPF_JSET | BPF_X] = true, 999 }; 1000 1001 if (code_to_probe >= ARRAY_SIZE(codes)) 1002 return false; 1003 1004 return codes[code_to_probe]; 1005 } 1006 1007 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1008 unsigned int flen) 1009 { 1010 if (filter == NULL) 1011 return false; 1012 if (flen == 0 || flen > BPF_MAXINSNS) 1013 return false; 1014 1015 return true; 1016 } 1017 1018 /** 1019 * bpf_check_classic - verify socket filter code 1020 * @filter: filter to verify 1021 * @flen: length of filter 1022 * 1023 * Check the user's filter code. If we let some ugly 1024 * filter code slip through kaboom! The filter must contain 1025 * no references or jumps that are out of range, no illegal 1026 * instructions, and must end with a RET instruction. 1027 * 1028 * All jumps are forward as they are not signed. 1029 * 1030 * Returns 0 if the rule set is legal or -EINVAL if not. 1031 */ 1032 static int bpf_check_classic(const struct sock_filter *filter, 1033 unsigned int flen) 1034 { 1035 bool anc_found; 1036 int pc; 1037 1038 /* Check the filter code now */ 1039 for (pc = 0; pc < flen; pc++) { 1040 const struct sock_filter *ftest = &filter[pc]; 1041 1042 /* May we actually operate on this code? */ 1043 if (!chk_code_allowed(ftest->code)) 1044 return -EINVAL; 1045 1046 /* Some instructions need special checks */ 1047 switch (ftest->code) { 1048 case BPF_ALU | BPF_DIV | BPF_K: 1049 case BPF_ALU | BPF_MOD | BPF_K: 1050 /* Check for division by zero */ 1051 if (ftest->k == 0) 1052 return -EINVAL; 1053 break; 1054 case BPF_ALU | BPF_LSH | BPF_K: 1055 case BPF_ALU | BPF_RSH | BPF_K: 1056 if (ftest->k >= 32) 1057 return -EINVAL; 1058 break; 1059 case BPF_LD | BPF_MEM: 1060 case BPF_LDX | BPF_MEM: 1061 case BPF_ST: 1062 case BPF_STX: 1063 /* Check for invalid memory addresses */ 1064 if (ftest->k >= BPF_MEMWORDS) 1065 return -EINVAL; 1066 break; 1067 case BPF_JMP | BPF_JA: 1068 /* Note, the large ftest->k might cause loops. 1069 * Compare this with conditional jumps below, 1070 * where offsets are limited. --ANK (981016) 1071 */ 1072 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1073 return -EINVAL; 1074 break; 1075 case BPF_JMP | BPF_JEQ | BPF_K: 1076 case BPF_JMP | BPF_JEQ | BPF_X: 1077 case BPF_JMP | BPF_JGE | BPF_K: 1078 case BPF_JMP | BPF_JGE | BPF_X: 1079 case BPF_JMP | BPF_JGT | BPF_K: 1080 case BPF_JMP | BPF_JGT | BPF_X: 1081 case BPF_JMP | BPF_JSET | BPF_K: 1082 case BPF_JMP | BPF_JSET | BPF_X: 1083 /* Both conditionals must be safe */ 1084 if (pc + ftest->jt + 1 >= flen || 1085 pc + ftest->jf + 1 >= flen) 1086 return -EINVAL; 1087 break; 1088 case BPF_LD | BPF_W | BPF_ABS: 1089 case BPF_LD | BPF_H | BPF_ABS: 1090 case BPF_LD | BPF_B | BPF_ABS: 1091 anc_found = false; 1092 if (bpf_anc_helper(ftest) & BPF_ANC) 1093 anc_found = true; 1094 /* Ancillary operation unknown or unsupported */ 1095 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1096 return -EINVAL; 1097 } 1098 } 1099 1100 /* Last instruction must be a RET code */ 1101 switch (filter[flen - 1].code) { 1102 case BPF_RET | BPF_K: 1103 case BPF_RET | BPF_A: 1104 return check_load_and_stores(filter, flen); 1105 } 1106 1107 return -EINVAL; 1108 } 1109 1110 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1111 const struct sock_fprog *fprog) 1112 { 1113 unsigned int fsize = bpf_classic_proglen(fprog); 1114 struct sock_fprog_kern *fkprog; 1115 1116 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1117 if (!fp->orig_prog) 1118 return -ENOMEM; 1119 1120 fkprog = fp->orig_prog; 1121 fkprog->len = fprog->len; 1122 1123 fkprog->filter = kmemdup(fp->insns, fsize, 1124 GFP_KERNEL | __GFP_NOWARN); 1125 if (!fkprog->filter) { 1126 kfree(fp->orig_prog); 1127 return -ENOMEM; 1128 } 1129 1130 return 0; 1131 } 1132 1133 static void bpf_release_orig_filter(struct bpf_prog *fp) 1134 { 1135 struct sock_fprog_kern *fprog = fp->orig_prog; 1136 1137 if (fprog) { 1138 kfree(fprog->filter); 1139 kfree(fprog); 1140 } 1141 } 1142 1143 static void __bpf_prog_release(struct bpf_prog *prog) 1144 { 1145 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1146 bpf_prog_put(prog); 1147 } else { 1148 bpf_release_orig_filter(prog); 1149 bpf_prog_free(prog); 1150 } 1151 } 1152 1153 static void __sk_filter_release(struct sk_filter *fp) 1154 { 1155 __bpf_prog_release(fp->prog); 1156 kfree(fp); 1157 } 1158 1159 /** 1160 * sk_filter_release_rcu - Release a socket filter by rcu_head 1161 * @rcu: rcu_head that contains the sk_filter to free 1162 */ 1163 static void sk_filter_release_rcu(struct rcu_head *rcu) 1164 { 1165 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1166 1167 __sk_filter_release(fp); 1168 } 1169 1170 /** 1171 * sk_filter_release - release a socket filter 1172 * @fp: filter to remove 1173 * 1174 * Remove a filter from a socket and release its resources. 1175 */ 1176 static void sk_filter_release(struct sk_filter *fp) 1177 { 1178 if (refcount_dec_and_test(&fp->refcnt)) 1179 call_rcu(&fp->rcu, sk_filter_release_rcu); 1180 } 1181 1182 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1183 { 1184 u32 filter_size = bpf_prog_size(fp->prog->len); 1185 1186 atomic_sub(filter_size, &sk->sk_omem_alloc); 1187 sk_filter_release(fp); 1188 } 1189 1190 /* try to charge the socket memory if there is space available 1191 * return true on success 1192 */ 1193 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1194 { 1195 u32 filter_size = bpf_prog_size(fp->prog->len); 1196 1197 /* same check as in sock_kmalloc() */ 1198 if (filter_size <= sysctl_optmem_max && 1199 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { 1200 atomic_add(filter_size, &sk->sk_omem_alloc); 1201 return true; 1202 } 1203 return false; 1204 } 1205 1206 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1207 { 1208 if (!refcount_inc_not_zero(&fp->refcnt)) 1209 return false; 1210 1211 if (!__sk_filter_charge(sk, fp)) { 1212 sk_filter_release(fp); 1213 return false; 1214 } 1215 return true; 1216 } 1217 1218 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1219 { 1220 struct sock_filter *old_prog; 1221 struct bpf_prog *old_fp; 1222 int err, new_len, old_len = fp->len; 1223 bool seen_ld_abs = false; 1224 1225 /* We are free to overwrite insns et al right here as it 1226 * won't be used at this point in time anymore internally 1227 * after the migration to the internal BPF instruction 1228 * representation. 1229 */ 1230 BUILD_BUG_ON(sizeof(struct sock_filter) != 1231 sizeof(struct bpf_insn)); 1232 1233 /* Conversion cannot happen on overlapping memory areas, 1234 * so we need to keep the user BPF around until the 2nd 1235 * pass. At this time, the user BPF is stored in fp->insns. 1236 */ 1237 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1238 GFP_KERNEL | __GFP_NOWARN); 1239 if (!old_prog) { 1240 err = -ENOMEM; 1241 goto out_err; 1242 } 1243 1244 /* 1st pass: calculate the new program length. */ 1245 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1246 &seen_ld_abs); 1247 if (err) 1248 goto out_err_free; 1249 1250 /* Expand fp for appending the new filter representation. */ 1251 old_fp = fp; 1252 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1253 if (!fp) { 1254 /* The old_fp is still around in case we couldn't 1255 * allocate new memory, so uncharge on that one. 1256 */ 1257 fp = old_fp; 1258 err = -ENOMEM; 1259 goto out_err_free; 1260 } 1261 1262 fp->len = new_len; 1263 1264 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1265 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1266 &seen_ld_abs); 1267 if (err) 1268 /* 2nd bpf_convert_filter() can fail only if it fails 1269 * to allocate memory, remapping must succeed. Note, 1270 * that at this time old_fp has already been released 1271 * by krealloc(). 1272 */ 1273 goto out_err_free; 1274 1275 fp = bpf_prog_select_runtime(fp, &err); 1276 if (err) 1277 goto out_err_free; 1278 1279 kfree(old_prog); 1280 return fp; 1281 1282 out_err_free: 1283 kfree(old_prog); 1284 out_err: 1285 __bpf_prog_release(fp); 1286 return ERR_PTR(err); 1287 } 1288 1289 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1290 bpf_aux_classic_check_t trans) 1291 { 1292 int err; 1293 1294 fp->bpf_func = NULL; 1295 fp->jited = 0; 1296 1297 err = bpf_check_classic(fp->insns, fp->len); 1298 if (err) { 1299 __bpf_prog_release(fp); 1300 return ERR_PTR(err); 1301 } 1302 1303 /* There might be additional checks and transformations 1304 * needed on classic filters, f.e. in case of seccomp. 1305 */ 1306 if (trans) { 1307 err = trans(fp->insns, fp->len); 1308 if (err) { 1309 __bpf_prog_release(fp); 1310 return ERR_PTR(err); 1311 } 1312 } 1313 1314 /* Probe if we can JIT compile the filter and if so, do 1315 * the compilation of the filter. 1316 */ 1317 bpf_jit_compile(fp); 1318 1319 /* JIT compiler couldn't process this filter, so do the 1320 * internal BPF translation for the optimized interpreter. 1321 */ 1322 if (!fp->jited) 1323 fp = bpf_migrate_filter(fp); 1324 1325 return fp; 1326 } 1327 1328 /** 1329 * bpf_prog_create - create an unattached filter 1330 * @pfp: the unattached filter that is created 1331 * @fprog: the filter program 1332 * 1333 * Create a filter independent of any socket. We first run some 1334 * sanity checks on it to make sure it does not explode on us later. 1335 * If an error occurs or there is insufficient memory for the filter 1336 * a negative errno code is returned. On success the return is zero. 1337 */ 1338 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1339 { 1340 unsigned int fsize = bpf_classic_proglen(fprog); 1341 struct bpf_prog *fp; 1342 1343 /* Make sure new filter is there and in the right amounts. */ 1344 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1345 return -EINVAL; 1346 1347 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1348 if (!fp) 1349 return -ENOMEM; 1350 1351 memcpy(fp->insns, fprog->filter, fsize); 1352 1353 fp->len = fprog->len; 1354 /* Since unattached filters are not copied back to user 1355 * space through sk_get_filter(), we do not need to hold 1356 * a copy here, and can spare us the work. 1357 */ 1358 fp->orig_prog = NULL; 1359 1360 /* bpf_prepare_filter() already takes care of freeing 1361 * memory in case something goes wrong. 1362 */ 1363 fp = bpf_prepare_filter(fp, NULL); 1364 if (IS_ERR(fp)) 1365 return PTR_ERR(fp); 1366 1367 *pfp = fp; 1368 return 0; 1369 } 1370 EXPORT_SYMBOL_GPL(bpf_prog_create); 1371 1372 /** 1373 * bpf_prog_create_from_user - create an unattached filter from user buffer 1374 * @pfp: the unattached filter that is created 1375 * @fprog: the filter program 1376 * @trans: post-classic verifier transformation handler 1377 * @save_orig: save classic BPF program 1378 * 1379 * This function effectively does the same as bpf_prog_create(), only 1380 * that it builds up its insns buffer from user space provided buffer. 1381 * It also allows for passing a bpf_aux_classic_check_t handler. 1382 */ 1383 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1384 bpf_aux_classic_check_t trans, bool save_orig) 1385 { 1386 unsigned int fsize = bpf_classic_proglen(fprog); 1387 struct bpf_prog *fp; 1388 int err; 1389 1390 /* Make sure new filter is there and in the right amounts. */ 1391 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1392 return -EINVAL; 1393 1394 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1395 if (!fp) 1396 return -ENOMEM; 1397 1398 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1399 __bpf_prog_free(fp); 1400 return -EFAULT; 1401 } 1402 1403 fp->len = fprog->len; 1404 fp->orig_prog = NULL; 1405 1406 if (save_orig) { 1407 err = bpf_prog_store_orig_filter(fp, fprog); 1408 if (err) { 1409 __bpf_prog_free(fp); 1410 return -ENOMEM; 1411 } 1412 } 1413 1414 /* bpf_prepare_filter() already takes care of freeing 1415 * memory in case something goes wrong. 1416 */ 1417 fp = bpf_prepare_filter(fp, trans); 1418 if (IS_ERR(fp)) 1419 return PTR_ERR(fp); 1420 1421 *pfp = fp; 1422 return 0; 1423 } 1424 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1425 1426 void bpf_prog_destroy(struct bpf_prog *fp) 1427 { 1428 __bpf_prog_release(fp); 1429 } 1430 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1431 1432 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1433 { 1434 struct sk_filter *fp, *old_fp; 1435 1436 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1437 if (!fp) 1438 return -ENOMEM; 1439 1440 fp->prog = prog; 1441 1442 if (!__sk_filter_charge(sk, fp)) { 1443 kfree(fp); 1444 return -ENOMEM; 1445 } 1446 refcount_set(&fp->refcnt, 1); 1447 1448 old_fp = rcu_dereference_protected(sk->sk_filter, 1449 lockdep_sock_is_held(sk)); 1450 rcu_assign_pointer(sk->sk_filter, fp); 1451 1452 if (old_fp) 1453 sk_filter_uncharge(sk, old_fp); 1454 1455 return 0; 1456 } 1457 1458 static 1459 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1460 { 1461 unsigned int fsize = bpf_classic_proglen(fprog); 1462 struct bpf_prog *prog; 1463 int err; 1464 1465 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1466 return ERR_PTR(-EPERM); 1467 1468 /* Make sure new filter is there and in the right amounts. */ 1469 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1470 return ERR_PTR(-EINVAL); 1471 1472 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1473 if (!prog) 1474 return ERR_PTR(-ENOMEM); 1475 1476 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1477 __bpf_prog_free(prog); 1478 return ERR_PTR(-EFAULT); 1479 } 1480 1481 prog->len = fprog->len; 1482 1483 err = bpf_prog_store_orig_filter(prog, fprog); 1484 if (err) { 1485 __bpf_prog_free(prog); 1486 return ERR_PTR(-ENOMEM); 1487 } 1488 1489 /* bpf_prepare_filter() already takes care of freeing 1490 * memory in case something goes wrong. 1491 */ 1492 return bpf_prepare_filter(prog, NULL); 1493 } 1494 1495 /** 1496 * sk_attach_filter - attach a socket filter 1497 * @fprog: the filter program 1498 * @sk: the socket to use 1499 * 1500 * Attach the user's filter code. We first run some sanity checks on 1501 * it to make sure it does not explode on us later. If an error 1502 * occurs or there is insufficient memory for the filter a negative 1503 * errno code is returned. On success the return is zero. 1504 */ 1505 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1506 { 1507 struct bpf_prog *prog = __get_filter(fprog, sk); 1508 int err; 1509 1510 if (IS_ERR(prog)) 1511 return PTR_ERR(prog); 1512 1513 err = __sk_attach_prog(prog, sk); 1514 if (err < 0) { 1515 __bpf_prog_release(prog); 1516 return err; 1517 } 1518 1519 return 0; 1520 } 1521 EXPORT_SYMBOL_GPL(sk_attach_filter); 1522 1523 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1524 { 1525 struct bpf_prog *prog = __get_filter(fprog, sk); 1526 int err; 1527 1528 if (IS_ERR(prog)) 1529 return PTR_ERR(prog); 1530 1531 if (bpf_prog_size(prog->len) > sysctl_optmem_max) 1532 err = -ENOMEM; 1533 else 1534 err = reuseport_attach_prog(sk, prog); 1535 1536 if (err) 1537 __bpf_prog_release(prog); 1538 1539 return err; 1540 } 1541 1542 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1543 { 1544 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1545 return ERR_PTR(-EPERM); 1546 1547 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1548 } 1549 1550 int sk_attach_bpf(u32 ufd, struct sock *sk) 1551 { 1552 struct bpf_prog *prog = __get_bpf(ufd, sk); 1553 int err; 1554 1555 if (IS_ERR(prog)) 1556 return PTR_ERR(prog); 1557 1558 err = __sk_attach_prog(prog, sk); 1559 if (err < 0) { 1560 bpf_prog_put(prog); 1561 return err; 1562 } 1563 1564 return 0; 1565 } 1566 1567 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1568 { 1569 struct bpf_prog *prog; 1570 int err; 1571 1572 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1573 return -EPERM; 1574 1575 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1576 if (IS_ERR(prog) && PTR_ERR(prog) == -EINVAL) 1577 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1578 if (IS_ERR(prog)) 1579 return PTR_ERR(prog); 1580 1581 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1582 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1583 * bpf prog (e.g. sockmap). It depends on the 1584 * limitation imposed by bpf_prog_load(). 1585 * Hence, sysctl_optmem_max is not checked. 1586 */ 1587 if ((sk->sk_type != SOCK_STREAM && 1588 sk->sk_type != SOCK_DGRAM) || 1589 (sk->sk_protocol != IPPROTO_UDP && 1590 sk->sk_protocol != IPPROTO_TCP) || 1591 (sk->sk_family != AF_INET && 1592 sk->sk_family != AF_INET6)) { 1593 err = -ENOTSUPP; 1594 goto err_prog_put; 1595 } 1596 } else { 1597 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1598 if (bpf_prog_size(prog->len) > sysctl_optmem_max) { 1599 err = -ENOMEM; 1600 goto err_prog_put; 1601 } 1602 } 1603 1604 err = reuseport_attach_prog(sk, prog); 1605 err_prog_put: 1606 if (err) 1607 bpf_prog_put(prog); 1608 1609 return err; 1610 } 1611 1612 void sk_reuseport_prog_free(struct bpf_prog *prog) 1613 { 1614 if (!prog) 1615 return; 1616 1617 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1618 bpf_prog_put(prog); 1619 else 1620 bpf_prog_destroy(prog); 1621 } 1622 1623 struct bpf_scratchpad { 1624 union { 1625 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1626 u8 buff[MAX_BPF_STACK]; 1627 }; 1628 }; 1629 1630 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1631 1632 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1633 unsigned int write_len) 1634 { 1635 return skb_ensure_writable(skb, write_len); 1636 } 1637 1638 static inline int bpf_try_make_writable(struct sk_buff *skb, 1639 unsigned int write_len) 1640 { 1641 int err = __bpf_try_make_writable(skb, write_len); 1642 1643 bpf_compute_data_pointers(skb); 1644 return err; 1645 } 1646 1647 static int bpf_try_make_head_writable(struct sk_buff *skb) 1648 { 1649 return bpf_try_make_writable(skb, skb_headlen(skb)); 1650 } 1651 1652 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1653 { 1654 if (skb_at_tc_ingress(skb)) 1655 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1656 } 1657 1658 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1659 { 1660 if (skb_at_tc_ingress(skb)) 1661 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1662 } 1663 1664 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1665 const void *, from, u32, len, u64, flags) 1666 { 1667 void *ptr; 1668 1669 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1670 return -EINVAL; 1671 if (unlikely(offset > 0xffff)) 1672 return -EFAULT; 1673 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1674 return -EFAULT; 1675 1676 ptr = skb->data + offset; 1677 if (flags & BPF_F_RECOMPUTE_CSUM) 1678 __skb_postpull_rcsum(skb, ptr, len, offset); 1679 1680 memcpy(ptr, from, len); 1681 1682 if (flags & BPF_F_RECOMPUTE_CSUM) 1683 __skb_postpush_rcsum(skb, ptr, len, offset); 1684 if (flags & BPF_F_INVALIDATE_HASH) 1685 skb_clear_hash(skb); 1686 1687 return 0; 1688 } 1689 1690 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1691 .func = bpf_skb_store_bytes, 1692 .gpl_only = false, 1693 .ret_type = RET_INTEGER, 1694 .arg1_type = ARG_PTR_TO_CTX, 1695 .arg2_type = ARG_ANYTHING, 1696 .arg3_type = ARG_PTR_TO_MEM, 1697 .arg4_type = ARG_CONST_SIZE, 1698 .arg5_type = ARG_ANYTHING, 1699 }; 1700 1701 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1702 void *, to, u32, len) 1703 { 1704 void *ptr; 1705 1706 if (unlikely(offset > 0xffff)) 1707 goto err_clear; 1708 1709 ptr = skb_header_pointer(skb, offset, len, to); 1710 if (unlikely(!ptr)) 1711 goto err_clear; 1712 if (ptr != to) 1713 memcpy(to, ptr, len); 1714 1715 return 0; 1716 err_clear: 1717 memset(to, 0, len); 1718 return -EFAULT; 1719 } 1720 1721 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1722 .func = bpf_skb_load_bytes, 1723 .gpl_only = false, 1724 .ret_type = RET_INTEGER, 1725 .arg1_type = ARG_PTR_TO_CTX, 1726 .arg2_type = ARG_ANYTHING, 1727 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1728 .arg4_type = ARG_CONST_SIZE, 1729 }; 1730 1731 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1732 const struct bpf_flow_dissector *, ctx, u32, offset, 1733 void *, to, u32, len) 1734 { 1735 void *ptr; 1736 1737 if (unlikely(offset > 0xffff)) 1738 goto err_clear; 1739 1740 if (unlikely(!ctx->skb)) 1741 goto err_clear; 1742 1743 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1744 if (unlikely(!ptr)) 1745 goto err_clear; 1746 if (ptr != to) 1747 memcpy(to, ptr, len); 1748 1749 return 0; 1750 err_clear: 1751 memset(to, 0, len); 1752 return -EFAULT; 1753 } 1754 1755 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1756 .func = bpf_flow_dissector_load_bytes, 1757 .gpl_only = false, 1758 .ret_type = RET_INTEGER, 1759 .arg1_type = ARG_PTR_TO_CTX, 1760 .arg2_type = ARG_ANYTHING, 1761 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1762 .arg4_type = ARG_CONST_SIZE, 1763 }; 1764 1765 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1766 u32, offset, void *, to, u32, len, u32, start_header) 1767 { 1768 u8 *end = skb_tail_pointer(skb); 1769 u8 *net = skb_network_header(skb); 1770 u8 *mac = skb_mac_header(skb); 1771 u8 *ptr; 1772 1773 if (unlikely(offset > 0xffff || len > (end - mac))) 1774 goto err_clear; 1775 1776 switch (start_header) { 1777 case BPF_HDR_START_MAC: 1778 ptr = mac + offset; 1779 break; 1780 case BPF_HDR_START_NET: 1781 ptr = net + offset; 1782 break; 1783 default: 1784 goto err_clear; 1785 } 1786 1787 if (likely(ptr >= mac && ptr + len <= end)) { 1788 memcpy(to, ptr, len); 1789 return 0; 1790 } 1791 1792 err_clear: 1793 memset(to, 0, len); 1794 return -EFAULT; 1795 } 1796 1797 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1798 .func = bpf_skb_load_bytes_relative, 1799 .gpl_only = false, 1800 .ret_type = RET_INTEGER, 1801 .arg1_type = ARG_PTR_TO_CTX, 1802 .arg2_type = ARG_ANYTHING, 1803 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1804 .arg4_type = ARG_CONST_SIZE, 1805 .arg5_type = ARG_ANYTHING, 1806 }; 1807 1808 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1809 { 1810 /* Idea is the following: should the needed direct read/write 1811 * test fail during runtime, we can pull in more data and redo 1812 * again, since implicitly, we invalidate previous checks here. 1813 * 1814 * Or, since we know how much we need to make read/writeable, 1815 * this can be done once at the program beginning for direct 1816 * access case. By this we overcome limitations of only current 1817 * headroom being accessible. 1818 */ 1819 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1820 } 1821 1822 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1823 .func = bpf_skb_pull_data, 1824 .gpl_only = false, 1825 .ret_type = RET_INTEGER, 1826 .arg1_type = ARG_PTR_TO_CTX, 1827 .arg2_type = ARG_ANYTHING, 1828 }; 1829 1830 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1831 { 1832 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1833 } 1834 1835 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1836 .func = bpf_sk_fullsock, 1837 .gpl_only = false, 1838 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1839 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1840 }; 1841 1842 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1843 unsigned int write_len) 1844 { 1845 int err = __bpf_try_make_writable(skb, write_len); 1846 1847 bpf_compute_data_end_sk_skb(skb); 1848 return err; 1849 } 1850 1851 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1852 { 1853 /* Idea is the following: should the needed direct read/write 1854 * test fail during runtime, we can pull in more data and redo 1855 * again, since implicitly, we invalidate previous checks here. 1856 * 1857 * Or, since we know how much we need to make read/writeable, 1858 * this can be done once at the program beginning for direct 1859 * access case. By this we overcome limitations of only current 1860 * headroom being accessible. 1861 */ 1862 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1863 } 1864 1865 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1866 .func = sk_skb_pull_data, 1867 .gpl_only = false, 1868 .ret_type = RET_INTEGER, 1869 .arg1_type = ARG_PTR_TO_CTX, 1870 .arg2_type = ARG_ANYTHING, 1871 }; 1872 1873 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1874 u64, from, u64, to, u64, flags) 1875 { 1876 __sum16 *ptr; 1877 1878 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1879 return -EINVAL; 1880 if (unlikely(offset > 0xffff || offset & 1)) 1881 return -EFAULT; 1882 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1883 return -EFAULT; 1884 1885 ptr = (__sum16 *)(skb->data + offset); 1886 switch (flags & BPF_F_HDR_FIELD_MASK) { 1887 case 0: 1888 if (unlikely(from != 0)) 1889 return -EINVAL; 1890 1891 csum_replace_by_diff(ptr, to); 1892 break; 1893 case 2: 1894 csum_replace2(ptr, from, to); 1895 break; 1896 case 4: 1897 csum_replace4(ptr, from, to); 1898 break; 1899 default: 1900 return -EINVAL; 1901 } 1902 1903 return 0; 1904 } 1905 1906 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1907 .func = bpf_l3_csum_replace, 1908 .gpl_only = false, 1909 .ret_type = RET_INTEGER, 1910 .arg1_type = ARG_PTR_TO_CTX, 1911 .arg2_type = ARG_ANYTHING, 1912 .arg3_type = ARG_ANYTHING, 1913 .arg4_type = ARG_ANYTHING, 1914 .arg5_type = ARG_ANYTHING, 1915 }; 1916 1917 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1918 u64, from, u64, to, u64, flags) 1919 { 1920 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1921 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1922 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1923 __sum16 *ptr; 1924 1925 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1926 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1927 return -EINVAL; 1928 if (unlikely(offset > 0xffff || offset & 1)) 1929 return -EFAULT; 1930 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1931 return -EFAULT; 1932 1933 ptr = (__sum16 *)(skb->data + offset); 1934 if (is_mmzero && !do_mforce && !*ptr) 1935 return 0; 1936 1937 switch (flags & BPF_F_HDR_FIELD_MASK) { 1938 case 0: 1939 if (unlikely(from != 0)) 1940 return -EINVAL; 1941 1942 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1943 break; 1944 case 2: 1945 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1946 break; 1947 case 4: 1948 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1949 break; 1950 default: 1951 return -EINVAL; 1952 } 1953 1954 if (is_mmzero && !*ptr) 1955 *ptr = CSUM_MANGLED_0; 1956 return 0; 1957 } 1958 1959 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 1960 .func = bpf_l4_csum_replace, 1961 .gpl_only = false, 1962 .ret_type = RET_INTEGER, 1963 .arg1_type = ARG_PTR_TO_CTX, 1964 .arg2_type = ARG_ANYTHING, 1965 .arg3_type = ARG_ANYTHING, 1966 .arg4_type = ARG_ANYTHING, 1967 .arg5_type = ARG_ANYTHING, 1968 }; 1969 1970 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 1971 __be32 *, to, u32, to_size, __wsum, seed) 1972 { 1973 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 1974 u32 diff_size = from_size + to_size; 1975 int i, j = 0; 1976 1977 /* This is quite flexible, some examples: 1978 * 1979 * from_size == 0, to_size > 0, seed := csum --> pushing data 1980 * from_size > 0, to_size == 0, seed := csum --> pulling data 1981 * from_size > 0, to_size > 0, seed := 0 --> diffing data 1982 * 1983 * Even for diffing, from_size and to_size don't need to be equal. 1984 */ 1985 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 1986 diff_size > sizeof(sp->diff))) 1987 return -EINVAL; 1988 1989 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 1990 sp->diff[j] = ~from[i]; 1991 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 1992 sp->diff[j] = to[i]; 1993 1994 return csum_partial(sp->diff, diff_size, seed); 1995 } 1996 1997 static const struct bpf_func_proto bpf_csum_diff_proto = { 1998 .func = bpf_csum_diff, 1999 .gpl_only = false, 2000 .pkt_access = true, 2001 .ret_type = RET_INTEGER, 2002 .arg1_type = ARG_PTR_TO_MEM_OR_NULL, 2003 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2004 .arg3_type = ARG_PTR_TO_MEM_OR_NULL, 2005 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2006 .arg5_type = ARG_ANYTHING, 2007 }; 2008 2009 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2010 { 2011 /* The interface is to be used in combination with bpf_csum_diff() 2012 * for direct packet writes. csum rotation for alignment as well 2013 * as emulating csum_sub() can be done from the eBPF program. 2014 */ 2015 if (skb->ip_summed == CHECKSUM_COMPLETE) 2016 return (skb->csum = csum_add(skb->csum, csum)); 2017 2018 return -ENOTSUPP; 2019 } 2020 2021 static const struct bpf_func_proto bpf_csum_update_proto = { 2022 .func = bpf_csum_update, 2023 .gpl_only = false, 2024 .ret_type = RET_INTEGER, 2025 .arg1_type = ARG_PTR_TO_CTX, 2026 .arg2_type = ARG_ANYTHING, 2027 }; 2028 2029 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2030 { 2031 return dev_forward_skb(dev, skb); 2032 } 2033 2034 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2035 struct sk_buff *skb) 2036 { 2037 int ret = ____dev_forward_skb(dev, skb); 2038 2039 if (likely(!ret)) { 2040 skb->dev = dev; 2041 ret = netif_rx(skb); 2042 } 2043 2044 return ret; 2045 } 2046 2047 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2048 { 2049 int ret; 2050 2051 if (dev_xmit_recursion()) { 2052 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2053 kfree_skb(skb); 2054 return -ENETDOWN; 2055 } 2056 2057 skb->dev = dev; 2058 2059 dev_xmit_recursion_inc(); 2060 ret = dev_queue_xmit(skb); 2061 dev_xmit_recursion_dec(); 2062 2063 return ret; 2064 } 2065 2066 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2067 u32 flags) 2068 { 2069 unsigned int mlen = skb_network_offset(skb); 2070 2071 if (mlen) { 2072 __skb_pull(skb, mlen); 2073 2074 /* At ingress, the mac header has already been pulled once. 2075 * At egress, skb_pospull_rcsum has to be done in case that 2076 * the skb is originated from ingress (i.e. a forwarded skb) 2077 * to ensure that rcsum starts at net header. 2078 */ 2079 if (!skb_at_tc_ingress(skb)) 2080 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2081 } 2082 skb_pop_mac_header(skb); 2083 skb_reset_mac_len(skb); 2084 return flags & BPF_F_INGRESS ? 2085 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2086 } 2087 2088 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2089 u32 flags) 2090 { 2091 /* Verify that a link layer header is carried */ 2092 if (unlikely(skb->mac_header >= skb->network_header)) { 2093 kfree_skb(skb); 2094 return -ERANGE; 2095 } 2096 2097 bpf_push_mac_rcsum(skb); 2098 return flags & BPF_F_INGRESS ? 2099 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2100 } 2101 2102 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2103 u32 flags) 2104 { 2105 if (dev_is_mac_header_xmit(dev)) 2106 return __bpf_redirect_common(skb, dev, flags); 2107 else 2108 return __bpf_redirect_no_mac(skb, dev, flags); 2109 } 2110 2111 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2112 { 2113 struct net_device *dev; 2114 struct sk_buff *clone; 2115 int ret; 2116 2117 if (unlikely(flags & ~(BPF_F_INGRESS))) 2118 return -EINVAL; 2119 2120 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2121 if (unlikely(!dev)) 2122 return -EINVAL; 2123 2124 clone = skb_clone(skb, GFP_ATOMIC); 2125 if (unlikely(!clone)) 2126 return -ENOMEM; 2127 2128 /* For direct write, we need to keep the invariant that the skbs 2129 * we're dealing with need to be uncloned. Should uncloning fail 2130 * here, we need to free the just generated clone to unclone once 2131 * again. 2132 */ 2133 ret = bpf_try_make_head_writable(skb); 2134 if (unlikely(ret)) { 2135 kfree_skb(clone); 2136 return -ENOMEM; 2137 } 2138 2139 return __bpf_redirect(clone, dev, flags); 2140 } 2141 2142 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2143 .func = bpf_clone_redirect, 2144 .gpl_only = false, 2145 .ret_type = RET_INTEGER, 2146 .arg1_type = ARG_PTR_TO_CTX, 2147 .arg2_type = ARG_ANYTHING, 2148 .arg3_type = ARG_ANYTHING, 2149 }; 2150 2151 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2152 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2153 2154 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2155 { 2156 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2157 2158 if (unlikely(flags & ~(BPF_F_INGRESS))) 2159 return TC_ACT_SHOT; 2160 2161 ri->flags = flags; 2162 ri->tgt_index = ifindex; 2163 2164 return TC_ACT_REDIRECT; 2165 } 2166 2167 int skb_do_redirect(struct sk_buff *skb) 2168 { 2169 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2170 struct net_device *dev; 2171 2172 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index); 2173 ri->tgt_index = 0; 2174 if (unlikely(!dev)) { 2175 kfree_skb(skb); 2176 return -EINVAL; 2177 } 2178 2179 return __bpf_redirect(skb, dev, ri->flags); 2180 } 2181 2182 static const struct bpf_func_proto bpf_redirect_proto = { 2183 .func = bpf_redirect, 2184 .gpl_only = false, 2185 .ret_type = RET_INTEGER, 2186 .arg1_type = ARG_ANYTHING, 2187 .arg2_type = ARG_ANYTHING, 2188 }; 2189 2190 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2191 { 2192 msg->apply_bytes = bytes; 2193 return 0; 2194 } 2195 2196 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2197 .func = bpf_msg_apply_bytes, 2198 .gpl_only = false, 2199 .ret_type = RET_INTEGER, 2200 .arg1_type = ARG_PTR_TO_CTX, 2201 .arg2_type = ARG_ANYTHING, 2202 }; 2203 2204 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2205 { 2206 msg->cork_bytes = bytes; 2207 return 0; 2208 } 2209 2210 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2211 .func = bpf_msg_cork_bytes, 2212 .gpl_only = false, 2213 .ret_type = RET_INTEGER, 2214 .arg1_type = ARG_PTR_TO_CTX, 2215 .arg2_type = ARG_ANYTHING, 2216 }; 2217 2218 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2219 u32, end, u64, flags) 2220 { 2221 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2222 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2223 struct scatterlist *sge; 2224 u8 *raw, *to, *from; 2225 struct page *page; 2226 2227 if (unlikely(flags || end <= start)) 2228 return -EINVAL; 2229 2230 /* First find the starting scatterlist element */ 2231 i = msg->sg.start; 2232 do { 2233 len = sk_msg_elem(msg, i)->length; 2234 if (start < offset + len) 2235 break; 2236 offset += len; 2237 sk_msg_iter_var_next(i); 2238 } while (i != msg->sg.end); 2239 2240 if (unlikely(start >= offset + len)) 2241 return -EINVAL; 2242 2243 first_sge = i; 2244 /* The start may point into the sg element so we need to also 2245 * account for the headroom. 2246 */ 2247 bytes_sg_total = start - offset + bytes; 2248 if (!msg->sg.copy[i] && bytes_sg_total <= len) 2249 goto out; 2250 2251 /* At this point we need to linearize multiple scatterlist 2252 * elements or a single shared page. Either way we need to 2253 * copy into a linear buffer exclusively owned by BPF. Then 2254 * place the buffer in the scatterlist and fixup the original 2255 * entries by removing the entries now in the linear buffer 2256 * and shifting the remaining entries. For now we do not try 2257 * to copy partial entries to avoid complexity of running out 2258 * of sg_entry slots. The downside is reading a single byte 2259 * will copy the entire sg entry. 2260 */ 2261 do { 2262 copy += sk_msg_elem(msg, i)->length; 2263 sk_msg_iter_var_next(i); 2264 if (bytes_sg_total <= copy) 2265 break; 2266 } while (i != msg->sg.end); 2267 last_sge = i; 2268 2269 if (unlikely(bytes_sg_total > copy)) 2270 return -EINVAL; 2271 2272 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2273 get_order(copy)); 2274 if (unlikely(!page)) 2275 return -ENOMEM; 2276 2277 raw = page_address(page); 2278 i = first_sge; 2279 do { 2280 sge = sk_msg_elem(msg, i); 2281 from = sg_virt(sge); 2282 len = sge->length; 2283 to = raw + poffset; 2284 2285 memcpy(to, from, len); 2286 poffset += len; 2287 sge->length = 0; 2288 put_page(sg_page(sge)); 2289 2290 sk_msg_iter_var_next(i); 2291 } while (i != last_sge); 2292 2293 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2294 2295 /* To repair sg ring we need to shift entries. If we only 2296 * had a single entry though we can just replace it and 2297 * be done. Otherwise walk the ring and shift the entries. 2298 */ 2299 WARN_ON_ONCE(last_sge == first_sge); 2300 shift = last_sge > first_sge ? 2301 last_sge - first_sge - 1 : 2302 MAX_SKB_FRAGS - first_sge + last_sge - 1; 2303 if (!shift) 2304 goto out; 2305 2306 i = first_sge; 2307 sk_msg_iter_var_next(i); 2308 do { 2309 u32 move_from; 2310 2311 if (i + shift >= MAX_MSG_FRAGS) 2312 move_from = i + shift - MAX_MSG_FRAGS; 2313 else 2314 move_from = i + shift; 2315 if (move_from == msg->sg.end) 2316 break; 2317 2318 msg->sg.data[i] = msg->sg.data[move_from]; 2319 msg->sg.data[move_from].length = 0; 2320 msg->sg.data[move_from].page_link = 0; 2321 msg->sg.data[move_from].offset = 0; 2322 sk_msg_iter_var_next(i); 2323 } while (1); 2324 2325 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2326 msg->sg.end - shift + MAX_MSG_FRAGS : 2327 msg->sg.end - shift; 2328 out: 2329 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2330 msg->data_end = msg->data + bytes; 2331 return 0; 2332 } 2333 2334 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2335 .func = bpf_msg_pull_data, 2336 .gpl_only = false, 2337 .ret_type = RET_INTEGER, 2338 .arg1_type = ARG_PTR_TO_CTX, 2339 .arg2_type = ARG_ANYTHING, 2340 .arg3_type = ARG_ANYTHING, 2341 .arg4_type = ARG_ANYTHING, 2342 }; 2343 2344 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2345 u32, len, u64, flags) 2346 { 2347 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2348 u32 new, i = 0, l, space, copy = 0, offset = 0; 2349 u8 *raw, *to, *from; 2350 struct page *page; 2351 2352 if (unlikely(flags)) 2353 return -EINVAL; 2354 2355 /* First find the starting scatterlist element */ 2356 i = msg->sg.start; 2357 do { 2358 l = sk_msg_elem(msg, i)->length; 2359 2360 if (start < offset + l) 2361 break; 2362 offset += l; 2363 sk_msg_iter_var_next(i); 2364 } while (i != msg->sg.end); 2365 2366 if (start >= offset + l) 2367 return -EINVAL; 2368 2369 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2370 2371 /* If no space available will fallback to copy, we need at 2372 * least one scatterlist elem available to push data into 2373 * when start aligns to the beginning of an element or two 2374 * when it falls inside an element. We handle the start equals 2375 * offset case because its the common case for inserting a 2376 * header. 2377 */ 2378 if (!space || (space == 1 && start != offset)) 2379 copy = msg->sg.data[i].length; 2380 2381 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2382 get_order(copy + len)); 2383 if (unlikely(!page)) 2384 return -ENOMEM; 2385 2386 if (copy) { 2387 int front, back; 2388 2389 raw = page_address(page); 2390 2391 psge = sk_msg_elem(msg, i); 2392 front = start - offset; 2393 back = psge->length - front; 2394 from = sg_virt(psge); 2395 2396 if (front) 2397 memcpy(raw, from, front); 2398 2399 if (back) { 2400 from += front; 2401 to = raw + front + len; 2402 2403 memcpy(to, from, back); 2404 } 2405 2406 put_page(sg_page(psge)); 2407 } else if (start - offset) { 2408 psge = sk_msg_elem(msg, i); 2409 rsge = sk_msg_elem_cpy(msg, i); 2410 2411 psge->length = start - offset; 2412 rsge.length -= psge->length; 2413 rsge.offset += start; 2414 2415 sk_msg_iter_var_next(i); 2416 sg_unmark_end(psge); 2417 sk_msg_iter_next(msg, end); 2418 } 2419 2420 /* Slot(s) to place newly allocated data */ 2421 new = i; 2422 2423 /* Shift one or two slots as needed */ 2424 if (!copy) { 2425 sge = sk_msg_elem_cpy(msg, i); 2426 2427 sk_msg_iter_var_next(i); 2428 sg_unmark_end(&sge); 2429 sk_msg_iter_next(msg, end); 2430 2431 nsge = sk_msg_elem_cpy(msg, i); 2432 if (rsge.length) { 2433 sk_msg_iter_var_next(i); 2434 nnsge = sk_msg_elem_cpy(msg, i); 2435 } 2436 2437 while (i != msg->sg.end) { 2438 msg->sg.data[i] = sge; 2439 sge = nsge; 2440 sk_msg_iter_var_next(i); 2441 if (rsge.length) { 2442 nsge = nnsge; 2443 nnsge = sk_msg_elem_cpy(msg, i); 2444 } else { 2445 nsge = sk_msg_elem_cpy(msg, i); 2446 } 2447 } 2448 } 2449 2450 /* Place newly allocated data buffer */ 2451 sk_mem_charge(msg->sk, len); 2452 msg->sg.size += len; 2453 msg->sg.copy[new] = false; 2454 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2455 if (rsge.length) { 2456 get_page(sg_page(&rsge)); 2457 sk_msg_iter_var_next(new); 2458 msg->sg.data[new] = rsge; 2459 } 2460 2461 sk_msg_compute_data_pointers(msg); 2462 return 0; 2463 } 2464 2465 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2466 .func = bpf_msg_push_data, 2467 .gpl_only = false, 2468 .ret_type = RET_INTEGER, 2469 .arg1_type = ARG_PTR_TO_CTX, 2470 .arg2_type = ARG_ANYTHING, 2471 .arg3_type = ARG_ANYTHING, 2472 .arg4_type = ARG_ANYTHING, 2473 }; 2474 2475 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2476 { 2477 int prev; 2478 2479 do { 2480 prev = i; 2481 sk_msg_iter_var_next(i); 2482 msg->sg.data[prev] = msg->sg.data[i]; 2483 } while (i != msg->sg.end); 2484 2485 sk_msg_iter_prev(msg, end); 2486 } 2487 2488 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2489 { 2490 struct scatterlist tmp, sge; 2491 2492 sk_msg_iter_next(msg, end); 2493 sge = sk_msg_elem_cpy(msg, i); 2494 sk_msg_iter_var_next(i); 2495 tmp = sk_msg_elem_cpy(msg, i); 2496 2497 while (i != msg->sg.end) { 2498 msg->sg.data[i] = sge; 2499 sk_msg_iter_var_next(i); 2500 sge = tmp; 2501 tmp = sk_msg_elem_cpy(msg, i); 2502 } 2503 } 2504 2505 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2506 u32, len, u64, flags) 2507 { 2508 u32 i = 0, l, space, offset = 0; 2509 u64 last = start + len; 2510 int pop; 2511 2512 if (unlikely(flags)) 2513 return -EINVAL; 2514 2515 /* First find the starting scatterlist element */ 2516 i = msg->sg.start; 2517 do { 2518 l = sk_msg_elem(msg, i)->length; 2519 2520 if (start < offset + l) 2521 break; 2522 offset += l; 2523 sk_msg_iter_var_next(i); 2524 } while (i != msg->sg.end); 2525 2526 /* Bounds checks: start and pop must be inside message */ 2527 if (start >= offset + l || last >= msg->sg.size) 2528 return -EINVAL; 2529 2530 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2531 2532 pop = len; 2533 /* --------------| offset 2534 * -| start |-------- len -------| 2535 * 2536 * |----- a ----|-------- pop -------|----- b ----| 2537 * |______________________________________________| length 2538 * 2539 * 2540 * a: region at front of scatter element to save 2541 * b: region at back of scatter element to save when length > A + pop 2542 * pop: region to pop from element, same as input 'pop' here will be 2543 * decremented below per iteration. 2544 * 2545 * Two top-level cases to handle when start != offset, first B is non 2546 * zero and second B is zero corresponding to when a pop includes more 2547 * than one element. 2548 * 2549 * Then if B is non-zero AND there is no space allocate space and 2550 * compact A, B regions into page. If there is space shift ring to 2551 * the rigth free'ing the next element in ring to place B, leaving 2552 * A untouched except to reduce length. 2553 */ 2554 if (start != offset) { 2555 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2556 int a = start; 2557 int b = sge->length - pop - a; 2558 2559 sk_msg_iter_var_next(i); 2560 2561 if (pop < sge->length - a) { 2562 if (space) { 2563 sge->length = a; 2564 sk_msg_shift_right(msg, i); 2565 nsge = sk_msg_elem(msg, i); 2566 get_page(sg_page(sge)); 2567 sg_set_page(nsge, 2568 sg_page(sge), 2569 b, sge->offset + pop + a); 2570 } else { 2571 struct page *page, *orig; 2572 u8 *to, *from; 2573 2574 page = alloc_pages(__GFP_NOWARN | 2575 __GFP_COMP | GFP_ATOMIC, 2576 get_order(a + b)); 2577 if (unlikely(!page)) 2578 return -ENOMEM; 2579 2580 sge->length = a; 2581 orig = sg_page(sge); 2582 from = sg_virt(sge); 2583 to = page_address(page); 2584 memcpy(to, from, a); 2585 memcpy(to + a, from + a + pop, b); 2586 sg_set_page(sge, page, a + b, 0); 2587 put_page(orig); 2588 } 2589 pop = 0; 2590 } else if (pop >= sge->length - a) { 2591 sge->length = a; 2592 pop -= (sge->length - a); 2593 } 2594 } 2595 2596 /* From above the current layout _must_ be as follows, 2597 * 2598 * -| offset 2599 * -| start 2600 * 2601 * |---- pop ---|---------------- b ------------| 2602 * |____________________________________________| length 2603 * 2604 * Offset and start of the current msg elem are equal because in the 2605 * previous case we handled offset != start and either consumed the 2606 * entire element and advanced to the next element OR pop == 0. 2607 * 2608 * Two cases to handle here are first pop is less than the length 2609 * leaving some remainder b above. Simply adjust the element's layout 2610 * in this case. Or pop >= length of the element so that b = 0. In this 2611 * case advance to next element decrementing pop. 2612 */ 2613 while (pop) { 2614 struct scatterlist *sge = sk_msg_elem(msg, i); 2615 2616 if (pop < sge->length) { 2617 sge->length -= pop; 2618 sge->offset += pop; 2619 pop = 0; 2620 } else { 2621 pop -= sge->length; 2622 sk_msg_shift_left(msg, i); 2623 } 2624 sk_msg_iter_var_next(i); 2625 } 2626 2627 sk_mem_uncharge(msg->sk, len - pop); 2628 msg->sg.size -= (len - pop); 2629 sk_msg_compute_data_pointers(msg); 2630 return 0; 2631 } 2632 2633 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 2634 .func = bpf_msg_pop_data, 2635 .gpl_only = false, 2636 .ret_type = RET_INTEGER, 2637 .arg1_type = ARG_PTR_TO_CTX, 2638 .arg2_type = ARG_ANYTHING, 2639 .arg3_type = ARG_ANYTHING, 2640 .arg4_type = ARG_ANYTHING, 2641 }; 2642 2643 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 2644 { 2645 return task_get_classid(skb); 2646 } 2647 2648 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 2649 .func = bpf_get_cgroup_classid, 2650 .gpl_only = false, 2651 .ret_type = RET_INTEGER, 2652 .arg1_type = ARG_PTR_TO_CTX, 2653 }; 2654 2655 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 2656 { 2657 return dst_tclassid(skb); 2658 } 2659 2660 static const struct bpf_func_proto bpf_get_route_realm_proto = { 2661 .func = bpf_get_route_realm, 2662 .gpl_only = false, 2663 .ret_type = RET_INTEGER, 2664 .arg1_type = ARG_PTR_TO_CTX, 2665 }; 2666 2667 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 2668 { 2669 /* If skb_clear_hash() was called due to mangling, we can 2670 * trigger SW recalculation here. Later access to hash 2671 * can then use the inline skb->hash via context directly 2672 * instead of calling this helper again. 2673 */ 2674 return skb_get_hash(skb); 2675 } 2676 2677 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 2678 .func = bpf_get_hash_recalc, 2679 .gpl_only = false, 2680 .ret_type = RET_INTEGER, 2681 .arg1_type = ARG_PTR_TO_CTX, 2682 }; 2683 2684 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 2685 { 2686 /* After all direct packet write, this can be used once for 2687 * triggering a lazy recalc on next skb_get_hash() invocation. 2688 */ 2689 skb_clear_hash(skb); 2690 return 0; 2691 } 2692 2693 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 2694 .func = bpf_set_hash_invalid, 2695 .gpl_only = false, 2696 .ret_type = RET_INTEGER, 2697 .arg1_type = ARG_PTR_TO_CTX, 2698 }; 2699 2700 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 2701 { 2702 /* Set user specified hash as L4(+), so that it gets returned 2703 * on skb_get_hash() call unless BPF prog later on triggers a 2704 * skb_clear_hash(). 2705 */ 2706 __skb_set_sw_hash(skb, hash, true); 2707 return 0; 2708 } 2709 2710 static const struct bpf_func_proto bpf_set_hash_proto = { 2711 .func = bpf_set_hash, 2712 .gpl_only = false, 2713 .ret_type = RET_INTEGER, 2714 .arg1_type = ARG_PTR_TO_CTX, 2715 .arg2_type = ARG_ANYTHING, 2716 }; 2717 2718 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 2719 u16, vlan_tci) 2720 { 2721 int ret; 2722 2723 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 2724 vlan_proto != htons(ETH_P_8021AD))) 2725 vlan_proto = htons(ETH_P_8021Q); 2726 2727 bpf_push_mac_rcsum(skb); 2728 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 2729 bpf_pull_mac_rcsum(skb); 2730 2731 bpf_compute_data_pointers(skb); 2732 return ret; 2733 } 2734 2735 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 2736 .func = bpf_skb_vlan_push, 2737 .gpl_only = false, 2738 .ret_type = RET_INTEGER, 2739 .arg1_type = ARG_PTR_TO_CTX, 2740 .arg2_type = ARG_ANYTHING, 2741 .arg3_type = ARG_ANYTHING, 2742 }; 2743 2744 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 2745 { 2746 int ret; 2747 2748 bpf_push_mac_rcsum(skb); 2749 ret = skb_vlan_pop(skb); 2750 bpf_pull_mac_rcsum(skb); 2751 2752 bpf_compute_data_pointers(skb); 2753 return ret; 2754 } 2755 2756 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 2757 .func = bpf_skb_vlan_pop, 2758 .gpl_only = false, 2759 .ret_type = RET_INTEGER, 2760 .arg1_type = ARG_PTR_TO_CTX, 2761 }; 2762 2763 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 2764 { 2765 /* Caller already did skb_cow() with len as headroom, 2766 * so no need to do it here. 2767 */ 2768 skb_push(skb, len); 2769 memmove(skb->data, skb->data + len, off); 2770 memset(skb->data + off, 0, len); 2771 2772 /* No skb_postpush_rcsum(skb, skb->data + off, len) 2773 * needed here as it does not change the skb->csum 2774 * result for checksum complete when summing over 2775 * zeroed blocks. 2776 */ 2777 return 0; 2778 } 2779 2780 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 2781 { 2782 /* skb_ensure_writable() is not needed here, as we're 2783 * already working on an uncloned skb. 2784 */ 2785 if (unlikely(!pskb_may_pull(skb, off + len))) 2786 return -ENOMEM; 2787 2788 skb_postpull_rcsum(skb, skb->data + off, len); 2789 memmove(skb->data + len, skb->data, off); 2790 __skb_pull(skb, len); 2791 2792 return 0; 2793 } 2794 2795 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 2796 { 2797 bool trans_same = skb->transport_header == skb->network_header; 2798 int ret; 2799 2800 /* There's no need for __skb_push()/__skb_pull() pair to 2801 * get to the start of the mac header as we're guaranteed 2802 * to always start from here under eBPF. 2803 */ 2804 ret = bpf_skb_generic_push(skb, off, len); 2805 if (likely(!ret)) { 2806 skb->mac_header -= len; 2807 skb->network_header -= len; 2808 if (trans_same) 2809 skb->transport_header = skb->network_header; 2810 } 2811 2812 return ret; 2813 } 2814 2815 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 2816 { 2817 bool trans_same = skb->transport_header == skb->network_header; 2818 int ret; 2819 2820 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 2821 ret = bpf_skb_generic_pop(skb, off, len); 2822 if (likely(!ret)) { 2823 skb->mac_header += len; 2824 skb->network_header += len; 2825 if (trans_same) 2826 skb->transport_header = skb->network_header; 2827 } 2828 2829 return ret; 2830 } 2831 2832 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 2833 { 2834 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2835 u32 off = skb_mac_header_len(skb); 2836 int ret; 2837 2838 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2839 return -ENOTSUPP; 2840 2841 ret = skb_cow(skb, len_diff); 2842 if (unlikely(ret < 0)) 2843 return ret; 2844 2845 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 2846 if (unlikely(ret < 0)) 2847 return ret; 2848 2849 if (skb_is_gso(skb)) { 2850 struct skb_shared_info *shinfo = skb_shinfo(skb); 2851 2852 /* SKB_GSO_TCPV4 needs to be changed into 2853 * SKB_GSO_TCPV6. 2854 */ 2855 if (shinfo->gso_type & SKB_GSO_TCPV4) { 2856 shinfo->gso_type &= ~SKB_GSO_TCPV4; 2857 shinfo->gso_type |= SKB_GSO_TCPV6; 2858 } 2859 2860 /* Due to IPv6 header, MSS needs to be downgraded. */ 2861 skb_decrease_gso_size(shinfo, len_diff); 2862 /* Header must be checked, and gso_segs recomputed. */ 2863 shinfo->gso_type |= SKB_GSO_DODGY; 2864 shinfo->gso_segs = 0; 2865 } 2866 2867 skb->protocol = htons(ETH_P_IPV6); 2868 skb_clear_hash(skb); 2869 2870 return 0; 2871 } 2872 2873 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 2874 { 2875 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2876 u32 off = skb_mac_header_len(skb); 2877 int ret; 2878 2879 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2880 return -ENOTSUPP; 2881 2882 ret = skb_unclone(skb, GFP_ATOMIC); 2883 if (unlikely(ret < 0)) 2884 return ret; 2885 2886 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 2887 if (unlikely(ret < 0)) 2888 return ret; 2889 2890 if (skb_is_gso(skb)) { 2891 struct skb_shared_info *shinfo = skb_shinfo(skb); 2892 2893 /* SKB_GSO_TCPV6 needs to be changed into 2894 * SKB_GSO_TCPV4. 2895 */ 2896 if (shinfo->gso_type & SKB_GSO_TCPV6) { 2897 shinfo->gso_type &= ~SKB_GSO_TCPV6; 2898 shinfo->gso_type |= SKB_GSO_TCPV4; 2899 } 2900 2901 /* Due to IPv4 header, MSS can be upgraded. */ 2902 skb_increase_gso_size(shinfo, len_diff); 2903 /* Header must be checked, and gso_segs recomputed. */ 2904 shinfo->gso_type |= SKB_GSO_DODGY; 2905 shinfo->gso_segs = 0; 2906 } 2907 2908 skb->protocol = htons(ETH_P_IP); 2909 skb_clear_hash(skb); 2910 2911 return 0; 2912 } 2913 2914 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 2915 { 2916 __be16 from_proto = skb->protocol; 2917 2918 if (from_proto == htons(ETH_P_IP) && 2919 to_proto == htons(ETH_P_IPV6)) 2920 return bpf_skb_proto_4_to_6(skb); 2921 2922 if (from_proto == htons(ETH_P_IPV6) && 2923 to_proto == htons(ETH_P_IP)) 2924 return bpf_skb_proto_6_to_4(skb); 2925 2926 return -ENOTSUPP; 2927 } 2928 2929 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 2930 u64, flags) 2931 { 2932 int ret; 2933 2934 if (unlikely(flags)) 2935 return -EINVAL; 2936 2937 /* General idea is that this helper does the basic groundwork 2938 * needed for changing the protocol, and eBPF program fills the 2939 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 2940 * and other helpers, rather than passing a raw buffer here. 2941 * 2942 * The rationale is to keep this minimal and without a need to 2943 * deal with raw packet data. F.e. even if we would pass buffers 2944 * here, the program still needs to call the bpf_lX_csum_replace() 2945 * helpers anyway. Plus, this way we keep also separation of 2946 * concerns, since f.e. bpf_skb_store_bytes() should only take 2947 * care of stores. 2948 * 2949 * Currently, additional options and extension header space are 2950 * not supported, but flags register is reserved so we can adapt 2951 * that. For offloads, we mark packet as dodgy, so that headers 2952 * need to be verified first. 2953 */ 2954 ret = bpf_skb_proto_xlat(skb, proto); 2955 bpf_compute_data_pointers(skb); 2956 return ret; 2957 } 2958 2959 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 2960 .func = bpf_skb_change_proto, 2961 .gpl_only = false, 2962 .ret_type = RET_INTEGER, 2963 .arg1_type = ARG_PTR_TO_CTX, 2964 .arg2_type = ARG_ANYTHING, 2965 .arg3_type = ARG_ANYTHING, 2966 }; 2967 2968 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 2969 { 2970 /* We only allow a restricted subset to be changed for now. */ 2971 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 2972 !skb_pkt_type_ok(pkt_type))) 2973 return -EINVAL; 2974 2975 skb->pkt_type = pkt_type; 2976 return 0; 2977 } 2978 2979 static const struct bpf_func_proto bpf_skb_change_type_proto = { 2980 .func = bpf_skb_change_type, 2981 .gpl_only = false, 2982 .ret_type = RET_INTEGER, 2983 .arg1_type = ARG_PTR_TO_CTX, 2984 .arg2_type = ARG_ANYTHING, 2985 }; 2986 2987 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 2988 { 2989 switch (skb->protocol) { 2990 case htons(ETH_P_IP): 2991 return sizeof(struct iphdr); 2992 case htons(ETH_P_IPV6): 2993 return sizeof(struct ipv6hdr); 2994 default: 2995 return ~0U; 2996 } 2997 } 2998 2999 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3000 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3001 3002 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3003 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3004 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3005 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3006 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3007 BPF_ADJ_ROOM_ENCAP_L2_MASK)) 3008 3009 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3010 u64 flags) 3011 { 3012 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3013 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3014 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3015 unsigned int gso_type = SKB_GSO_DODGY; 3016 int ret; 3017 3018 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3019 /* udp gso_size delineates datagrams, only allow if fixed */ 3020 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3021 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3022 return -ENOTSUPP; 3023 } 3024 3025 ret = skb_cow_head(skb, len_diff); 3026 if (unlikely(ret < 0)) 3027 return ret; 3028 3029 if (encap) { 3030 if (skb->protocol != htons(ETH_P_IP) && 3031 skb->protocol != htons(ETH_P_IPV6)) 3032 return -ENOTSUPP; 3033 3034 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3035 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3036 return -EINVAL; 3037 3038 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3039 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3040 return -EINVAL; 3041 3042 if (skb->encapsulation) 3043 return -EALREADY; 3044 3045 mac_len = skb->network_header - skb->mac_header; 3046 inner_net = skb->network_header; 3047 if (inner_mac_len > len_diff) 3048 return -EINVAL; 3049 inner_trans = skb->transport_header; 3050 } 3051 3052 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3053 if (unlikely(ret < 0)) 3054 return ret; 3055 3056 if (encap) { 3057 skb->inner_mac_header = inner_net - inner_mac_len; 3058 skb->inner_network_header = inner_net; 3059 skb->inner_transport_header = inner_trans; 3060 skb_set_inner_protocol(skb, skb->protocol); 3061 3062 skb->encapsulation = 1; 3063 skb_set_network_header(skb, mac_len); 3064 3065 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3066 gso_type |= SKB_GSO_UDP_TUNNEL; 3067 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3068 gso_type |= SKB_GSO_GRE; 3069 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3070 gso_type |= SKB_GSO_IPXIP6; 3071 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3072 gso_type |= SKB_GSO_IPXIP4; 3073 3074 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3075 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3076 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3077 sizeof(struct ipv6hdr) : 3078 sizeof(struct iphdr); 3079 3080 skb_set_transport_header(skb, mac_len + nh_len); 3081 } 3082 3083 /* Match skb->protocol to new outer l3 protocol */ 3084 if (skb->protocol == htons(ETH_P_IP) && 3085 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3086 skb->protocol = htons(ETH_P_IPV6); 3087 else if (skb->protocol == htons(ETH_P_IPV6) && 3088 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3089 skb->protocol = htons(ETH_P_IP); 3090 } 3091 3092 if (skb_is_gso(skb)) { 3093 struct skb_shared_info *shinfo = skb_shinfo(skb); 3094 3095 /* Due to header grow, MSS needs to be downgraded. */ 3096 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3097 skb_decrease_gso_size(shinfo, len_diff); 3098 3099 /* Header must be checked, and gso_segs recomputed. */ 3100 shinfo->gso_type |= gso_type; 3101 shinfo->gso_segs = 0; 3102 } 3103 3104 return 0; 3105 } 3106 3107 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3108 u64 flags) 3109 { 3110 int ret; 3111 3112 if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO) 3113 return -EINVAL; 3114 3115 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3116 /* udp gso_size delineates datagrams, only allow if fixed */ 3117 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3118 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3119 return -ENOTSUPP; 3120 } 3121 3122 ret = skb_unclone(skb, GFP_ATOMIC); 3123 if (unlikely(ret < 0)) 3124 return ret; 3125 3126 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3127 if (unlikely(ret < 0)) 3128 return ret; 3129 3130 if (skb_is_gso(skb)) { 3131 struct skb_shared_info *shinfo = skb_shinfo(skb); 3132 3133 /* Due to header shrink, MSS can be upgraded. */ 3134 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3135 skb_increase_gso_size(shinfo, len_diff); 3136 3137 /* Header must be checked, and gso_segs recomputed. */ 3138 shinfo->gso_type |= SKB_GSO_DODGY; 3139 shinfo->gso_segs = 0; 3140 } 3141 3142 return 0; 3143 } 3144 3145 static u32 __bpf_skb_max_len(const struct sk_buff *skb) 3146 { 3147 return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : 3148 SKB_MAX_ALLOC; 3149 } 3150 3151 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3152 u32, mode, u64, flags) 3153 { 3154 u32 len_cur, len_diff_abs = abs(len_diff); 3155 u32 len_min = bpf_skb_net_base_len(skb); 3156 u32 len_max = __bpf_skb_max_len(skb); 3157 __be16 proto = skb->protocol; 3158 bool shrink = len_diff < 0; 3159 u32 off; 3160 int ret; 3161 3162 if (unlikely(flags & ~BPF_F_ADJ_ROOM_MASK)) 3163 return -EINVAL; 3164 if (unlikely(len_diff_abs > 0xfffU)) 3165 return -EFAULT; 3166 if (unlikely(proto != htons(ETH_P_IP) && 3167 proto != htons(ETH_P_IPV6))) 3168 return -ENOTSUPP; 3169 3170 off = skb_mac_header_len(skb); 3171 switch (mode) { 3172 case BPF_ADJ_ROOM_NET: 3173 off += bpf_skb_net_base_len(skb); 3174 break; 3175 case BPF_ADJ_ROOM_MAC: 3176 break; 3177 default: 3178 return -ENOTSUPP; 3179 } 3180 3181 len_cur = skb->len - skb_network_offset(skb); 3182 if ((shrink && (len_diff_abs >= len_cur || 3183 len_cur - len_diff_abs < len_min)) || 3184 (!shrink && (skb->len + len_diff_abs > len_max && 3185 !skb_is_gso(skb)))) 3186 return -ENOTSUPP; 3187 3188 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3189 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3190 3191 bpf_compute_data_pointers(skb); 3192 return ret; 3193 } 3194 3195 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3196 .func = bpf_skb_adjust_room, 3197 .gpl_only = false, 3198 .ret_type = RET_INTEGER, 3199 .arg1_type = ARG_PTR_TO_CTX, 3200 .arg2_type = ARG_ANYTHING, 3201 .arg3_type = ARG_ANYTHING, 3202 .arg4_type = ARG_ANYTHING, 3203 }; 3204 3205 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3206 { 3207 u32 min_len = skb_network_offset(skb); 3208 3209 if (skb_transport_header_was_set(skb)) 3210 min_len = skb_transport_offset(skb); 3211 if (skb->ip_summed == CHECKSUM_PARTIAL) 3212 min_len = skb_checksum_start_offset(skb) + 3213 skb->csum_offset + sizeof(__sum16); 3214 return min_len; 3215 } 3216 3217 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3218 { 3219 unsigned int old_len = skb->len; 3220 int ret; 3221 3222 ret = __skb_grow_rcsum(skb, new_len); 3223 if (!ret) 3224 memset(skb->data + old_len, 0, new_len - old_len); 3225 return ret; 3226 } 3227 3228 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3229 { 3230 return __skb_trim_rcsum(skb, new_len); 3231 } 3232 3233 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3234 u64 flags) 3235 { 3236 u32 max_len = __bpf_skb_max_len(skb); 3237 u32 min_len = __bpf_skb_min_len(skb); 3238 int ret; 3239 3240 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3241 return -EINVAL; 3242 if (skb->encapsulation) 3243 return -ENOTSUPP; 3244 3245 /* The basic idea of this helper is that it's performing the 3246 * needed work to either grow or trim an skb, and eBPF program 3247 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3248 * bpf_lX_csum_replace() and others rather than passing a raw 3249 * buffer here. This one is a slow path helper and intended 3250 * for replies with control messages. 3251 * 3252 * Like in bpf_skb_change_proto(), we want to keep this rather 3253 * minimal and without protocol specifics so that we are able 3254 * to separate concerns as in bpf_skb_store_bytes() should only 3255 * be the one responsible for writing buffers. 3256 * 3257 * It's really expected to be a slow path operation here for 3258 * control message replies, so we're implicitly linearizing, 3259 * uncloning and drop offloads from the skb by this. 3260 */ 3261 ret = __bpf_try_make_writable(skb, skb->len); 3262 if (!ret) { 3263 if (new_len > skb->len) 3264 ret = bpf_skb_grow_rcsum(skb, new_len); 3265 else if (new_len < skb->len) 3266 ret = bpf_skb_trim_rcsum(skb, new_len); 3267 if (!ret && skb_is_gso(skb)) 3268 skb_gso_reset(skb); 3269 } 3270 return ret; 3271 } 3272 3273 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3274 u64, flags) 3275 { 3276 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3277 3278 bpf_compute_data_pointers(skb); 3279 return ret; 3280 } 3281 3282 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3283 .func = bpf_skb_change_tail, 3284 .gpl_only = false, 3285 .ret_type = RET_INTEGER, 3286 .arg1_type = ARG_PTR_TO_CTX, 3287 .arg2_type = ARG_ANYTHING, 3288 .arg3_type = ARG_ANYTHING, 3289 }; 3290 3291 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3292 u64, flags) 3293 { 3294 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3295 3296 bpf_compute_data_end_sk_skb(skb); 3297 return ret; 3298 } 3299 3300 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3301 .func = sk_skb_change_tail, 3302 .gpl_only = false, 3303 .ret_type = RET_INTEGER, 3304 .arg1_type = ARG_PTR_TO_CTX, 3305 .arg2_type = ARG_ANYTHING, 3306 .arg3_type = ARG_ANYTHING, 3307 }; 3308 3309 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3310 u64 flags) 3311 { 3312 u32 max_len = __bpf_skb_max_len(skb); 3313 u32 new_len = skb->len + head_room; 3314 int ret; 3315 3316 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3317 new_len < skb->len)) 3318 return -EINVAL; 3319 3320 ret = skb_cow(skb, head_room); 3321 if (likely(!ret)) { 3322 /* Idea for this helper is that we currently only 3323 * allow to expand on mac header. This means that 3324 * skb->protocol network header, etc, stay as is. 3325 * Compared to bpf_skb_change_tail(), we're more 3326 * flexible due to not needing to linearize or 3327 * reset GSO. Intention for this helper is to be 3328 * used by an L3 skb that needs to push mac header 3329 * for redirection into L2 device. 3330 */ 3331 __skb_push(skb, head_room); 3332 memset(skb->data, 0, head_room); 3333 skb_reset_mac_header(skb); 3334 } 3335 3336 return ret; 3337 } 3338 3339 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3340 u64, flags) 3341 { 3342 int ret = __bpf_skb_change_head(skb, head_room, flags); 3343 3344 bpf_compute_data_pointers(skb); 3345 return ret; 3346 } 3347 3348 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3349 .func = bpf_skb_change_head, 3350 .gpl_only = false, 3351 .ret_type = RET_INTEGER, 3352 .arg1_type = ARG_PTR_TO_CTX, 3353 .arg2_type = ARG_ANYTHING, 3354 .arg3_type = ARG_ANYTHING, 3355 }; 3356 3357 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3358 u64, flags) 3359 { 3360 int ret = __bpf_skb_change_head(skb, head_room, flags); 3361 3362 bpf_compute_data_end_sk_skb(skb); 3363 return ret; 3364 } 3365 3366 static const struct bpf_func_proto sk_skb_change_head_proto = { 3367 .func = sk_skb_change_head, 3368 .gpl_only = false, 3369 .ret_type = RET_INTEGER, 3370 .arg1_type = ARG_PTR_TO_CTX, 3371 .arg2_type = ARG_ANYTHING, 3372 .arg3_type = ARG_ANYTHING, 3373 }; 3374 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3375 { 3376 return xdp_data_meta_unsupported(xdp) ? 0 : 3377 xdp->data - xdp->data_meta; 3378 } 3379 3380 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3381 { 3382 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3383 unsigned long metalen = xdp_get_metalen(xdp); 3384 void *data_start = xdp_frame_end + metalen; 3385 void *data = xdp->data + offset; 3386 3387 if (unlikely(data < data_start || 3388 data > xdp->data_end - ETH_HLEN)) 3389 return -EINVAL; 3390 3391 if (metalen) 3392 memmove(xdp->data_meta + offset, 3393 xdp->data_meta, metalen); 3394 xdp->data_meta += offset; 3395 xdp->data = data; 3396 3397 return 0; 3398 } 3399 3400 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3401 .func = bpf_xdp_adjust_head, 3402 .gpl_only = false, 3403 .ret_type = RET_INTEGER, 3404 .arg1_type = ARG_PTR_TO_CTX, 3405 .arg2_type = ARG_ANYTHING, 3406 }; 3407 3408 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 3409 { 3410 void *data_end = xdp->data_end + offset; 3411 3412 /* only shrinking is allowed for now. */ 3413 if (unlikely(offset >= 0)) 3414 return -EINVAL; 3415 3416 if (unlikely(data_end < xdp->data + ETH_HLEN)) 3417 return -EINVAL; 3418 3419 xdp->data_end = data_end; 3420 3421 return 0; 3422 } 3423 3424 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 3425 .func = bpf_xdp_adjust_tail, 3426 .gpl_only = false, 3427 .ret_type = RET_INTEGER, 3428 .arg1_type = ARG_PTR_TO_CTX, 3429 .arg2_type = ARG_ANYTHING, 3430 }; 3431 3432 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 3433 { 3434 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3435 void *meta = xdp->data_meta + offset; 3436 unsigned long metalen = xdp->data - meta; 3437 3438 if (xdp_data_meta_unsupported(xdp)) 3439 return -ENOTSUPP; 3440 if (unlikely(meta < xdp_frame_end || 3441 meta > xdp->data)) 3442 return -EINVAL; 3443 if (unlikely((metalen & (sizeof(__u32) - 1)) || 3444 (metalen > 32))) 3445 return -EACCES; 3446 3447 xdp->data_meta = meta; 3448 3449 return 0; 3450 } 3451 3452 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 3453 .func = bpf_xdp_adjust_meta, 3454 .gpl_only = false, 3455 .ret_type = RET_INTEGER, 3456 .arg1_type = ARG_PTR_TO_CTX, 3457 .arg2_type = ARG_ANYTHING, 3458 }; 3459 3460 static int __bpf_tx_xdp(struct net_device *dev, 3461 struct bpf_map *map, 3462 struct xdp_buff *xdp, 3463 u32 index) 3464 { 3465 struct xdp_frame *xdpf; 3466 int err, sent; 3467 3468 if (!dev->netdev_ops->ndo_xdp_xmit) { 3469 return -EOPNOTSUPP; 3470 } 3471 3472 err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data); 3473 if (unlikely(err)) 3474 return err; 3475 3476 xdpf = convert_to_xdp_frame(xdp); 3477 if (unlikely(!xdpf)) 3478 return -EOVERFLOW; 3479 3480 sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH); 3481 if (sent <= 0) 3482 return sent; 3483 return 0; 3484 } 3485 3486 static noinline int 3487 xdp_do_redirect_slow(struct net_device *dev, struct xdp_buff *xdp, 3488 struct bpf_prog *xdp_prog, struct bpf_redirect_info *ri) 3489 { 3490 struct net_device *fwd; 3491 u32 index = ri->tgt_index; 3492 int err; 3493 3494 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3495 ri->tgt_index = 0; 3496 if (unlikely(!fwd)) { 3497 err = -EINVAL; 3498 goto err; 3499 } 3500 3501 err = __bpf_tx_xdp(fwd, NULL, xdp, 0); 3502 if (unlikely(err)) 3503 goto err; 3504 3505 _trace_xdp_redirect(dev, xdp_prog, index); 3506 return 0; 3507 err: 3508 _trace_xdp_redirect_err(dev, xdp_prog, index, err); 3509 return err; 3510 } 3511 3512 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, 3513 struct bpf_map *map, 3514 struct xdp_buff *xdp, 3515 u32 index) 3516 { 3517 int err; 3518 3519 switch (map->map_type) { 3520 case BPF_MAP_TYPE_DEVMAP: 3521 case BPF_MAP_TYPE_DEVMAP_HASH: { 3522 struct bpf_dtab_netdev *dst = fwd; 3523 3524 err = dev_map_enqueue(dst, xdp, dev_rx); 3525 if (unlikely(err)) 3526 return err; 3527 break; 3528 } 3529 case BPF_MAP_TYPE_CPUMAP: { 3530 struct bpf_cpu_map_entry *rcpu = fwd; 3531 3532 err = cpu_map_enqueue(rcpu, xdp, dev_rx); 3533 if (unlikely(err)) 3534 return err; 3535 break; 3536 } 3537 case BPF_MAP_TYPE_XSKMAP: { 3538 struct xdp_sock *xs = fwd; 3539 3540 err = __xsk_map_redirect(map, xdp, xs); 3541 return err; 3542 } 3543 default: 3544 break; 3545 } 3546 return 0; 3547 } 3548 3549 void xdp_do_flush_map(void) 3550 { 3551 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3552 struct bpf_map *map = ri->map_to_flush; 3553 3554 ri->map_to_flush = NULL; 3555 if (map) { 3556 switch (map->map_type) { 3557 case BPF_MAP_TYPE_DEVMAP: 3558 case BPF_MAP_TYPE_DEVMAP_HASH: 3559 __dev_map_flush(map); 3560 break; 3561 case BPF_MAP_TYPE_CPUMAP: 3562 __cpu_map_flush(map); 3563 break; 3564 case BPF_MAP_TYPE_XSKMAP: 3565 __xsk_map_flush(map); 3566 break; 3567 default: 3568 break; 3569 } 3570 } 3571 } 3572 EXPORT_SYMBOL_GPL(xdp_do_flush_map); 3573 3574 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) 3575 { 3576 switch (map->map_type) { 3577 case BPF_MAP_TYPE_DEVMAP: 3578 return __dev_map_lookup_elem(map, index); 3579 case BPF_MAP_TYPE_DEVMAP_HASH: 3580 return __dev_map_hash_lookup_elem(map, index); 3581 case BPF_MAP_TYPE_CPUMAP: 3582 return __cpu_map_lookup_elem(map, index); 3583 case BPF_MAP_TYPE_XSKMAP: 3584 return __xsk_map_lookup_elem(map, index); 3585 default: 3586 return NULL; 3587 } 3588 } 3589 3590 void bpf_clear_redirect_map(struct bpf_map *map) 3591 { 3592 struct bpf_redirect_info *ri; 3593 int cpu; 3594 3595 for_each_possible_cpu(cpu) { 3596 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 3597 /* Avoid polluting remote cacheline due to writes if 3598 * not needed. Once we pass this test, we need the 3599 * cmpxchg() to make sure it hasn't been changed in 3600 * the meantime by remote CPU. 3601 */ 3602 if (unlikely(READ_ONCE(ri->map) == map)) 3603 cmpxchg(&ri->map, map, NULL); 3604 } 3605 } 3606 3607 static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, 3608 struct bpf_prog *xdp_prog, struct bpf_map *map, 3609 struct bpf_redirect_info *ri) 3610 { 3611 u32 index = ri->tgt_index; 3612 void *fwd = ri->tgt_value; 3613 int err; 3614 3615 ri->tgt_index = 0; 3616 ri->tgt_value = NULL; 3617 WRITE_ONCE(ri->map, NULL); 3618 3619 if (ri->map_to_flush && unlikely(ri->map_to_flush != map)) 3620 xdp_do_flush_map(); 3621 3622 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index); 3623 if (unlikely(err)) 3624 goto err; 3625 3626 ri->map_to_flush = map; 3627 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3628 return 0; 3629 err: 3630 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3631 return err; 3632 } 3633 3634 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 3635 struct bpf_prog *xdp_prog) 3636 { 3637 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3638 struct bpf_map *map = READ_ONCE(ri->map); 3639 3640 if (likely(map)) 3641 return xdp_do_redirect_map(dev, xdp, xdp_prog, map, ri); 3642 3643 return xdp_do_redirect_slow(dev, xdp, xdp_prog, ri); 3644 } 3645 EXPORT_SYMBOL_GPL(xdp_do_redirect); 3646 3647 static int xdp_do_generic_redirect_map(struct net_device *dev, 3648 struct sk_buff *skb, 3649 struct xdp_buff *xdp, 3650 struct bpf_prog *xdp_prog, 3651 struct bpf_map *map) 3652 { 3653 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3654 u32 index = ri->tgt_index; 3655 void *fwd = ri->tgt_value; 3656 int err = 0; 3657 3658 ri->tgt_index = 0; 3659 ri->tgt_value = NULL; 3660 WRITE_ONCE(ri->map, NULL); 3661 3662 if (map->map_type == BPF_MAP_TYPE_DEVMAP || 3663 map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) { 3664 struct bpf_dtab_netdev *dst = fwd; 3665 3666 err = dev_map_generic_redirect(dst, skb, xdp_prog); 3667 if (unlikely(err)) 3668 goto err; 3669 } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { 3670 struct xdp_sock *xs = fwd; 3671 3672 err = xsk_generic_rcv(xs, xdp); 3673 if (err) 3674 goto err; 3675 consume_skb(skb); 3676 } else { 3677 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ 3678 err = -EBADRQC; 3679 goto err; 3680 } 3681 3682 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3683 return 0; 3684 err: 3685 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3686 return err; 3687 } 3688 3689 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 3690 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 3691 { 3692 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3693 struct bpf_map *map = READ_ONCE(ri->map); 3694 u32 index = ri->tgt_index; 3695 struct net_device *fwd; 3696 int err = 0; 3697 3698 if (map) 3699 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, 3700 map); 3701 ri->tgt_index = 0; 3702 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3703 if (unlikely(!fwd)) { 3704 err = -EINVAL; 3705 goto err; 3706 } 3707 3708 err = xdp_ok_fwd_dev(fwd, skb->len); 3709 if (unlikely(err)) 3710 goto err; 3711 3712 skb->dev = fwd; 3713 _trace_xdp_redirect(dev, xdp_prog, index); 3714 generic_xdp_tx(skb, xdp_prog); 3715 return 0; 3716 err: 3717 _trace_xdp_redirect_err(dev, xdp_prog, index, err); 3718 return err; 3719 } 3720 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); 3721 3722 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 3723 { 3724 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3725 3726 if (unlikely(flags)) 3727 return XDP_ABORTED; 3728 3729 ri->flags = flags; 3730 ri->tgt_index = ifindex; 3731 ri->tgt_value = NULL; 3732 WRITE_ONCE(ri->map, NULL); 3733 3734 return XDP_REDIRECT; 3735 } 3736 3737 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 3738 .func = bpf_xdp_redirect, 3739 .gpl_only = false, 3740 .ret_type = RET_INTEGER, 3741 .arg1_type = ARG_ANYTHING, 3742 .arg2_type = ARG_ANYTHING, 3743 }; 3744 3745 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, 3746 u64, flags) 3747 { 3748 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3749 3750 /* Lower bits of the flags are used as return code on lookup failure */ 3751 if (unlikely(flags > XDP_TX)) 3752 return XDP_ABORTED; 3753 3754 ri->tgt_value = __xdp_map_lookup_elem(map, ifindex); 3755 if (unlikely(!ri->tgt_value)) { 3756 /* If the lookup fails we want to clear out the state in the 3757 * redirect_info struct completely, so that if an eBPF program 3758 * performs multiple lookups, the last one always takes 3759 * precedence. 3760 */ 3761 WRITE_ONCE(ri->map, NULL); 3762 return flags; 3763 } 3764 3765 ri->flags = flags; 3766 ri->tgt_index = ifindex; 3767 WRITE_ONCE(ri->map, map); 3768 3769 return XDP_REDIRECT; 3770 } 3771 3772 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 3773 .func = bpf_xdp_redirect_map, 3774 .gpl_only = false, 3775 .ret_type = RET_INTEGER, 3776 .arg1_type = ARG_CONST_MAP_PTR, 3777 .arg2_type = ARG_ANYTHING, 3778 .arg3_type = ARG_ANYTHING, 3779 }; 3780 3781 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 3782 unsigned long off, unsigned long len) 3783 { 3784 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 3785 3786 if (unlikely(!ptr)) 3787 return len; 3788 if (ptr != dst_buff) 3789 memcpy(dst_buff, ptr, len); 3790 3791 return 0; 3792 } 3793 3794 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 3795 u64, flags, void *, meta, u64, meta_size) 3796 { 3797 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 3798 3799 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 3800 return -EINVAL; 3801 if (unlikely(skb_size > skb->len)) 3802 return -EFAULT; 3803 3804 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 3805 bpf_skb_copy); 3806 } 3807 3808 static const struct bpf_func_proto bpf_skb_event_output_proto = { 3809 .func = bpf_skb_event_output, 3810 .gpl_only = true, 3811 .ret_type = RET_INTEGER, 3812 .arg1_type = ARG_PTR_TO_CTX, 3813 .arg2_type = ARG_CONST_MAP_PTR, 3814 .arg3_type = ARG_ANYTHING, 3815 .arg4_type = ARG_PTR_TO_MEM, 3816 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 3817 }; 3818 3819 static unsigned short bpf_tunnel_key_af(u64 flags) 3820 { 3821 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 3822 } 3823 3824 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 3825 u32, size, u64, flags) 3826 { 3827 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3828 u8 compat[sizeof(struct bpf_tunnel_key)]; 3829 void *to_orig = to; 3830 int err; 3831 3832 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { 3833 err = -EINVAL; 3834 goto err_clear; 3835 } 3836 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 3837 err = -EPROTO; 3838 goto err_clear; 3839 } 3840 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3841 err = -EINVAL; 3842 switch (size) { 3843 case offsetof(struct bpf_tunnel_key, tunnel_label): 3844 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3845 goto set_compat; 3846 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3847 /* Fixup deprecated structure layouts here, so we have 3848 * a common path later on. 3849 */ 3850 if (ip_tunnel_info_af(info) != AF_INET) 3851 goto err_clear; 3852 set_compat: 3853 to = (struct bpf_tunnel_key *)compat; 3854 break; 3855 default: 3856 goto err_clear; 3857 } 3858 } 3859 3860 to->tunnel_id = be64_to_cpu(info->key.tun_id); 3861 to->tunnel_tos = info->key.tos; 3862 to->tunnel_ttl = info->key.ttl; 3863 to->tunnel_ext = 0; 3864 3865 if (flags & BPF_F_TUNINFO_IPV6) { 3866 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 3867 sizeof(to->remote_ipv6)); 3868 to->tunnel_label = be32_to_cpu(info->key.label); 3869 } else { 3870 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 3871 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 3872 to->tunnel_label = 0; 3873 } 3874 3875 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 3876 memcpy(to_orig, to, size); 3877 3878 return 0; 3879 err_clear: 3880 memset(to_orig, 0, size); 3881 return err; 3882 } 3883 3884 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 3885 .func = bpf_skb_get_tunnel_key, 3886 .gpl_only = false, 3887 .ret_type = RET_INTEGER, 3888 .arg1_type = ARG_PTR_TO_CTX, 3889 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3890 .arg3_type = ARG_CONST_SIZE, 3891 .arg4_type = ARG_ANYTHING, 3892 }; 3893 3894 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 3895 { 3896 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3897 int err; 3898 3899 if (unlikely(!info || 3900 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 3901 err = -ENOENT; 3902 goto err_clear; 3903 } 3904 if (unlikely(size < info->options_len)) { 3905 err = -ENOMEM; 3906 goto err_clear; 3907 } 3908 3909 ip_tunnel_info_opts_get(to, info); 3910 if (size > info->options_len) 3911 memset(to + info->options_len, 0, size - info->options_len); 3912 3913 return info->options_len; 3914 err_clear: 3915 memset(to, 0, size); 3916 return err; 3917 } 3918 3919 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 3920 .func = bpf_skb_get_tunnel_opt, 3921 .gpl_only = false, 3922 .ret_type = RET_INTEGER, 3923 .arg1_type = ARG_PTR_TO_CTX, 3924 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3925 .arg3_type = ARG_CONST_SIZE, 3926 }; 3927 3928 static struct metadata_dst __percpu *md_dst; 3929 3930 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 3931 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 3932 { 3933 struct metadata_dst *md = this_cpu_ptr(md_dst); 3934 u8 compat[sizeof(struct bpf_tunnel_key)]; 3935 struct ip_tunnel_info *info; 3936 3937 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 3938 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) 3939 return -EINVAL; 3940 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3941 switch (size) { 3942 case offsetof(struct bpf_tunnel_key, tunnel_label): 3943 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3944 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3945 /* Fixup deprecated structure layouts here, so we have 3946 * a common path later on. 3947 */ 3948 memcpy(compat, from, size); 3949 memset(compat + size, 0, sizeof(compat) - size); 3950 from = (const struct bpf_tunnel_key *) compat; 3951 break; 3952 default: 3953 return -EINVAL; 3954 } 3955 } 3956 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 3957 from->tunnel_ext)) 3958 return -EINVAL; 3959 3960 skb_dst_drop(skb); 3961 dst_hold((struct dst_entry *) md); 3962 skb_dst_set(skb, (struct dst_entry *) md); 3963 3964 info = &md->u.tun_info; 3965 memset(info, 0, sizeof(*info)); 3966 info->mode = IP_TUNNEL_INFO_TX; 3967 3968 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 3969 if (flags & BPF_F_DONT_FRAGMENT) 3970 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 3971 if (flags & BPF_F_ZERO_CSUM_TX) 3972 info->key.tun_flags &= ~TUNNEL_CSUM; 3973 if (flags & BPF_F_SEQ_NUMBER) 3974 info->key.tun_flags |= TUNNEL_SEQ; 3975 3976 info->key.tun_id = cpu_to_be64(from->tunnel_id); 3977 info->key.tos = from->tunnel_tos; 3978 info->key.ttl = from->tunnel_ttl; 3979 3980 if (flags & BPF_F_TUNINFO_IPV6) { 3981 info->mode |= IP_TUNNEL_INFO_IPV6; 3982 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 3983 sizeof(from->remote_ipv6)); 3984 info->key.label = cpu_to_be32(from->tunnel_label) & 3985 IPV6_FLOWLABEL_MASK; 3986 } else { 3987 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 3988 } 3989 3990 return 0; 3991 } 3992 3993 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 3994 .func = bpf_skb_set_tunnel_key, 3995 .gpl_only = false, 3996 .ret_type = RET_INTEGER, 3997 .arg1_type = ARG_PTR_TO_CTX, 3998 .arg2_type = ARG_PTR_TO_MEM, 3999 .arg3_type = ARG_CONST_SIZE, 4000 .arg4_type = ARG_ANYTHING, 4001 }; 4002 4003 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4004 const u8 *, from, u32, size) 4005 { 4006 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4007 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4008 4009 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4010 return -EINVAL; 4011 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4012 return -ENOMEM; 4013 4014 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4015 4016 return 0; 4017 } 4018 4019 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4020 .func = bpf_skb_set_tunnel_opt, 4021 .gpl_only = false, 4022 .ret_type = RET_INTEGER, 4023 .arg1_type = ARG_PTR_TO_CTX, 4024 .arg2_type = ARG_PTR_TO_MEM, 4025 .arg3_type = ARG_CONST_SIZE, 4026 }; 4027 4028 static const struct bpf_func_proto * 4029 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4030 { 4031 if (!md_dst) { 4032 struct metadata_dst __percpu *tmp; 4033 4034 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4035 METADATA_IP_TUNNEL, 4036 GFP_KERNEL); 4037 if (!tmp) 4038 return NULL; 4039 if (cmpxchg(&md_dst, NULL, tmp)) 4040 metadata_dst_free_percpu(tmp); 4041 } 4042 4043 switch (which) { 4044 case BPF_FUNC_skb_set_tunnel_key: 4045 return &bpf_skb_set_tunnel_key_proto; 4046 case BPF_FUNC_skb_set_tunnel_opt: 4047 return &bpf_skb_set_tunnel_opt_proto; 4048 default: 4049 return NULL; 4050 } 4051 } 4052 4053 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4054 u32, idx) 4055 { 4056 struct bpf_array *array = container_of(map, struct bpf_array, map); 4057 struct cgroup *cgrp; 4058 struct sock *sk; 4059 4060 sk = skb_to_full_sk(skb); 4061 if (!sk || !sk_fullsock(sk)) 4062 return -ENOENT; 4063 if (unlikely(idx >= array->map.max_entries)) 4064 return -E2BIG; 4065 4066 cgrp = READ_ONCE(array->ptrs[idx]); 4067 if (unlikely(!cgrp)) 4068 return -EAGAIN; 4069 4070 return sk_under_cgroup_hierarchy(sk, cgrp); 4071 } 4072 4073 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4074 .func = bpf_skb_under_cgroup, 4075 .gpl_only = false, 4076 .ret_type = RET_INTEGER, 4077 .arg1_type = ARG_PTR_TO_CTX, 4078 .arg2_type = ARG_CONST_MAP_PTR, 4079 .arg3_type = ARG_ANYTHING, 4080 }; 4081 4082 #ifdef CONFIG_SOCK_CGROUP_DATA 4083 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4084 { 4085 struct sock *sk = skb_to_full_sk(skb); 4086 struct cgroup *cgrp; 4087 4088 if (!sk || !sk_fullsock(sk)) 4089 return 0; 4090 4091 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4092 return cgrp->kn->id.id; 4093 } 4094 4095 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4096 .func = bpf_skb_cgroup_id, 4097 .gpl_only = false, 4098 .ret_type = RET_INTEGER, 4099 .arg1_type = ARG_PTR_TO_CTX, 4100 }; 4101 4102 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4103 ancestor_level) 4104 { 4105 struct sock *sk = skb_to_full_sk(skb); 4106 struct cgroup *ancestor; 4107 struct cgroup *cgrp; 4108 4109 if (!sk || !sk_fullsock(sk)) 4110 return 0; 4111 4112 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4113 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4114 if (!ancestor) 4115 return 0; 4116 4117 return ancestor->kn->id.id; 4118 } 4119 4120 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4121 .func = bpf_skb_ancestor_cgroup_id, 4122 .gpl_only = false, 4123 .ret_type = RET_INTEGER, 4124 .arg1_type = ARG_PTR_TO_CTX, 4125 .arg2_type = ARG_ANYTHING, 4126 }; 4127 #endif 4128 4129 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, 4130 unsigned long off, unsigned long len) 4131 { 4132 memcpy(dst_buff, src_buff + off, len); 4133 return 0; 4134 } 4135 4136 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4137 u64, flags, void *, meta, u64, meta_size) 4138 { 4139 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4140 4141 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4142 return -EINVAL; 4143 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) 4144 return -EFAULT; 4145 4146 return bpf_event_output(map, flags, meta, meta_size, xdp->data, 4147 xdp_size, bpf_xdp_copy); 4148 } 4149 4150 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4151 .func = bpf_xdp_event_output, 4152 .gpl_only = true, 4153 .ret_type = RET_INTEGER, 4154 .arg1_type = ARG_PTR_TO_CTX, 4155 .arg2_type = ARG_CONST_MAP_PTR, 4156 .arg3_type = ARG_ANYTHING, 4157 .arg4_type = ARG_PTR_TO_MEM, 4158 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4159 }; 4160 4161 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4162 { 4163 return skb->sk ? sock_gen_cookie(skb->sk) : 0; 4164 } 4165 4166 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4167 .func = bpf_get_socket_cookie, 4168 .gpl_only = false, 4169 .ret_type = RET_INTEGER, 4170 .arg1_type = ARG_PTR_TO_CTX, 4171 }; 4172 4173 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4174 { 4175 return sock_gen_cookie(ctx->sk); 4176 } 4177 4178 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4179 .func = bpf_get_socket_cookie_sock_addr, 4180 .gpl_only = false, 4181 .ret_type = RET_INTEGER, 4182 .arg1_type = ARG_PTR_TO_CTX, 4183 }; 4184 4185 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 4186 { 4187 return sock_gen_cookie(ctx->sk); 4188 } 4189 4190 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 4191 .func = bpf_get_socket_cookie_sock_ops, 4192 .gpl_only = false, 4193 .ret_type = RET_INTEGER, 4194 .arg1_type = ARG_PTR_TO_CTX, 4195 }; 4196 4197 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 4198 { 4199 struct sock *sk = sk_to_full_sk(skb->sk); 4200 kuid_t kuid; 4201 4202 if (!sk || !sk_fullsock(sk)) 4203 return overflowuid; 4204 kuid = sock_net_uid(sock_net(sk), sk); 4205 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 4206 } 4207 4208 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 4209 .func = bpf_get_socket_uid, 4210 .gpl_only = false, 4211 .ret_type = RET_INTEGER, 4212 .arg1_type = ARG_PTR_TO_CTX, 4213 }; 4214 4215 BPF_CALL_5(bpf_sockopt_event_output, struct bpf_sock_ops_kern *, bpf_sock, 4216 struct bpf_map *, map, u64, flags, void *, data, u64, size) 4217 { 4218 if (unlikely(flags & ~(BPF_F_INDEX_MASK))) 4219 return -EINVAL; 4220 4221 return bpf_event_output(map, flags, data, size, NULL, 0, NULL); 4222 } 4223 4224 static const struct bpf_func_proto bpf_sockopt_event_output_proto = { 4225 .func = bpf_sockopt_event_output, 4226 .gpl_only = true, 4227 .ret_type = RET_INTEGER, 4228 .arg1_type = ARG_PTR_TO_CTX, 4229 .arg2_type = ARG_CONST_MAP_PTR, 4230 .arg3_type = ARG_ANYTHING, 4231 .arg4_type = ARG_PTR_TO_MEM, 4232 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4233 }; 4234 4235 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4236 int, level, int, optname, char *, optval, int, optlen) 4237 { 4238 struct sock *sk = bpf_sock->sk; 4239 int ret = 0; 4240 int val; 4241 4242 if (!sk_fullsock(sk)) 4243 return -EINVAL; 4244 4245 if (level == SOL_SOCKET) { 4246 if (optlen != sizeof(int)) 4247 return -EINVAL; 4248 val = *((int *)optval); 4249 4250 /* Only some socketops are supported */ 4251 switch (optname) { 4252 case SO_RCVBUF: 4253 val = min_t(u32, val, sysctl_rmem_max); 4254 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 4255 WRITE_ONCE(sk->sk_rcvbuf, 4256 max_t(int, val * 2, SOCK_MIN_RCVBUF)); 4257 break; 4258 case SO_SNDBUF: 4259 val = min_t(u32, val, sysctl_wmem_max); 4260 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 4261 WRITE_ONCE(sk->sk_sndbuf, 4262 max_t(int, val * 2, SOCK_MIN_SNDBUF)); 4263 break; 4264 case SO_MAX_PACING_RATE: /* 32bit version */ 4265 if (val != ~0U) 4266 cmpxchg(&sk->sk_pacing_status, 4267 SK_PACING_NONE, 4268 SK_PACING_NEEDED); 4269 sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; 4270 sk->sk_pacing_rate = min(sk->sk_pacing_rate, 4271 sk->sk_max_pacing_rate); 4272 break; 4273 case SO_PRIORITY: 4274 sk->sk_priority = val; 4275 break; 4276 case SO_RCVLOWAT: 4277 if (val < 0) 4278 val = INT_MAX; 4279 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 4280 break; 4281 case SO_MARK: 4282 if (sk->sk_mark != val) { 4283 sk->sk_mark = val; 4284 sk_dst_reset(sk); 4285 } 4286 break; 4287 default: 4288 ret = -EINVAL; 4289 } 4290 #ifdef CONFIG_INET 4291 } else if (level == SOL_IP) { 4292 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4293 return -EINVAL; 4294 4295 val = *((int *)optval); 4296 /* Only some options are supported */ 4297 switch (optname) { 4298 case IP_TOS: 4299 if (val < -1 || val > 0xff) { 4300 ret = -EINVAL; 4301 } else { 4302 struct inet_sock *inet = inet_sk(sk); 4303 4304 if (val == -1) 4305 val = 0; 4306 inet->tos = val; 4307 } 4308 break; 4309 default: 4310 ret = -EINVAL; 4311 } 4312 #if IS_ENABLED(CONFIG_IPV6) 4313 } else if (level == SOL_IPV6) { 4314 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4315 return -EINVAL; 4316 4317 val = *((int *)optval); 4318 /* Only some options are supported */ 4319 switch (optname) { 4320 case IPV6_TCLASS: 4321 if (val < -1 || val > 0xff) { 4322 ret = -EINVAL; 4323 } else { 4324 struct ipv6_pinfo *np = inet6_sk(sk); 4325 4326 if (val == -1) 4327 val = 0; 4328 np->tclass = val; 4329 } 4330 break; 4331 default: 4332 ret = -EINVAL; 4333 } 4334 #endif 4335 } else if (level == SOL_TCP && 4336 sk->sk_prot->setsockopt == tcp_setsockopt) { 4337 if (optname == TCP_CONGESTION) { 4338 char name[TCP_CA_NAME_MAX]; 4339 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; 4340 4341 strncpy(name, optval, min_t(long, optlen, 4342 TCP_CA_NAME_MAX-1)); 4343 name[TCP_CA_NAME_MAX-1] = 0; 4344 ret = tcp_set_congestion_control(sk, name, false, 4345 reinit, true); 4346 } else { 4347 struct tcp_sock *tp = tcp_sk(sk); 4348 4349 if (optlen != sizeof(int)) 4350 return -EINVAL; 4351 4352 val = *((int *)optval); 4353 /* Only some options are supported */ 4354 switch (optname) { 4355 case TCP_BPF_IW: 4356 if (val <= 0 || tp->data_segs_out > tp->syn_data) 4357 ret = -EINVAL; 4358 else 4359 tp->snd_cwnd = val; 4360 break; 4361 case TCP_BPF_SNDCWND_CLAMP: 4362 if (val <= 0) { 4363 ret = -EINVAL; 4364 } else { 4365 tp->snd_cwnd_clamp = val; 4366 tp->snd_ssthresh = val; 4367 } 4368 break; 4369 case TCP_SAVE_SYN: 4370 if (val < 0 || val > 1) 4371 ret = -EINVAL; 4372 else 4373 tp->save_syn = val; 4374 break; 4375 default: 4376 ret = -EINVAL; 4377 } 4378 } 4379 #endif 4380 } else { 4381 ret = -EINVAL; 4382 } 4383 return ret; 4384 } 4385 4386 static const struct bpf_func_proto bpf_setsockopt_proto = { 4387 .func = bpf_setsockopt, 4388 .gpl_only = false, 4389 .ret_type = RET_INTEGER, 4390 .arg1_type = ARG_PTR_TO_CTX, 4391 .arg2_type = ARG_ANYTHING, 4392 .arg3_type = ARG_ANYTHING, 4393 .arg4_type = ARG_PTR_TO_MEM, 4394 .arg5_type = ARG_CONST_SIZE, 4395 }; 4396 4397 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4398 int, level, int, optname, char *, optval, int, optlen) 4399 { 4400 struct sock *sk = bpf_sock->sk; 4401 4402 if (!sk_fullsock(sk)) 4403 goto err_clear; 4404 #ifdef CONFIG_INET 4405 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { 4406 struct inet_connection_sock *icsk; 4407 struct tcp_sock *tp; 4408 4409 switch (optname) { 4410 case TCP_CONGESTION: 4411 icsk = inet_csk(sk); 4412 4413 if (!icsk->icsk_ca_ops || optlen <= 1) 4414 goto err_clear; 4415 strncpy(optval, icsk->icsk_ca_ops->name, optlen); 4416 optval[optlen - 1] = 0; 4417 break; 4418 case TCP_SAVED_SYN: 4419 tp = tcp_sk(sk); 4420 4421 if (optlen <= 0 || !tp->saved_syn || 4422 optlen > tp->saved_syn[0]) 4423 goto err_clear; 4424 memcpy(optval, tp->saved_syn + 1, optlen); 4425 break; 4426 default: 4427 goto err_clear; 4428 } 4429 } else if (level == SOL_IP) { 4430 struct inet_sock *inet = inet_sk(sk); 4431 4432 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4433 goto err_clear; 4434 4435 /* Only some options are supported */ 4436 switch (optname) { 4437 case IP_TOS: 4438 *((int *)optval) = (int)inet->tos; 4439 break; 4440 default: 4441 goto err_clear; 4442 } 4443 #if IS_ENABLED(CONFIG_IPV6) 4444 } else if (level == SOL_IPV6) { 4445 struct ipv6_pinfo *np = inet6_sk(sk); 4446 4447 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4448 goto err_clear; 4449 4450 /* Only some options are supported */ 4451 switch (optname) { 4452 case IPV6_TCLASS: 4453 *((int *)optval) = (int)np->tclass; 4454 break; 4455 default: 4456 goto err_clear; 4457 } 4458 #endif 4459 } else { 4460 goto err_clear; 4461 } 4462 return 0; 4463 #endif 4464 err_clear: 4465 memset(optval, 0, optlen); 4466 return -EINVAL; 4467 } 4468 4469 static const struct bpf_func_proto bpf_getsockopt_proto = { 4470 .func = bpf_getsockopt, 4471 .gpl_only = false, 4472 .ret_type = RET_INTEGER, 4473 .arg1_type = ARG_PTR_TO_CTX, 4474 .arg2_type = ARG_ANYTHING, 4475 .arg3_type = ARG_ANYTHING, 4476 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 4477 .arg5_type = ARG_CONST_SIZE, 4478 }; 4479 4480 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 4481 int, argval) 4482 { 4483 struct sock *sk = bpf_sock->sk; 4484 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 4485 4486 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 4487 return -EINVAL; 4488 4489 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 4490 4491 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 4492 } 4493 4494 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 4495 .func = bpf_sock_ops_cb_flags_set, 4496 .gpl_only = false, 4497 .ret_type = RET_INTEGER, 4498 .arg1_type = ARG_PTR_TO_CTX, 4499 .arg2_type = ARG_ANYTHING, 4500 }; 4501 4502 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 4503 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 4504 4505 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 4506 int, addr_len) 4507 { 4508 #ifdef CONFIG_INET 4509 struct sock *sk = ctx->sk; 4510 int err; 4511 4512 /* Binding to port can be expensive so it's prohibited in the helper. 4513 * Only binding to IP is supported. 4514 */ 4515 err = -EINVAL; 4516 if (addr_len < offsetofend(struct sockaddr, sa_family)) 4517 return err; 4518 if (addr->sa_family == AF_INET) { 4519 if (addr_len < sizeof(struct sockaddr_in)) 4520 return err; 4521 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 4522 return err; 4523 return __inet_bind(sk, addr, addr_len, true, false); 4524 #if IS_ENABLED(CONFIG_IPV6) 4525 } else if (addr->sa_family == AF_INET6) { 4526 if (addr_len < SIN6_LEN_RFC2133) 4527 return err; 4528 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 4529 return err; 4530 /* ipv6_bpf_stub cannot be NULL, since it's called from 4531 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 4532 */ 4533 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); 4534 #endif /* CONFIG_IPV6 */ 4535 } 4536 #endif /* CONFIG_INET */ 4537 4538 return -EAFNOSUPPORT; 4539 } 4540 4541 static const struct bpf_func_proto bpf_bind_proto = { 4542 .func = bpf_bind, 4543 .gpl_only = false, 4544 .ret_type = RET_INTEGER, 4545 .arg1_type = ARG_PTR_TO_CTX, 4546 .arg2_type = ARG_PTR_TO_MEM, 4547 .arg3_type = ARG_CONST_SIZE, 4548 }; 4549 4550 #ifdef CONFIG_XFRM 4551 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 4552 struct bpf_xfrm_state *, to, u32, size, u64, flags) 4553 { 4554 const struct sec_path *sp = skb_sec_path(skb); 4555 const struct xfrm_state *x; 4556 4557 if (!sp || unlikely(index >= sp->len || flags)) 4558 goto err_clear; 4559 4560 x = sp->xvec[index]; 4561 4562 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 4563 goto err_clear; 4564 4565 to->reqid = x->props.reqid; 4566 to->spi = x->id.spi; 4567 to->family = x->props.family; 4568 to->ext = 0; 4569 4570 if (to->family == AF_INET6) { 4571 memcpy(to->remote_ipv6, x->props.saddr.a6, 4572 sizeof(to->remote_ipv6)); 4573 } else { 4574 to->remote_ipv4 = x->props.saddr.a4; 4575 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4576 } 4577 4578 return 0; 4579 err_clear: 4580 memset(to, 0, size); 4581 return -EINVAL; 4582 } 4583 4584 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 4585 .func = bpf_skb_get_xfrm_state, 4586 .gpl_only = false, 4587 .ret_type = RET_INTEGER, 4588 .arg1_type = ARG_PTR_TO_CTX, 4589 .arg2_type = ARG_ANYTHING, 4590 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4591 .arg4_type = ARG_CONST_SIZE, 4592 .arg5_type = ARG_ANYTHING, 4593 }; 4594 #endif 4595 4596 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 4597 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, 4598 const struct neighbour *neigh, 4599 const struct net_device *dev) 4600 { 4601 memcpy(params->dmac, neigh->ha, ETH_ALEN); 4602 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 4603 params->h_vlan_TCI = 0; 4604 params->h_vlan_proto = 0; 4605 params->ifindex = dev->ifindex; 4606 4607 return 0; 4608 } 4609 #endif 4610 4611 #if IS_ENABLED(CONFIG_INET) 4612 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4613 u32 flags, bool check_mtu) 4614 { 4615 struct fib_nh_common *nhc; 4616 struct in_device *in_dev; 4617 struct neighbour *neigh; 4618 struct net_device *dev; 4619 struct fib_result res; 4620 struct flowi4 fl4; 4621 int err; 4622 u32 mtu; 4623 4624 dev = dev_get_by_index_rcu(net, params->ifindex); 4625 if (unlikely(!dev)) 4626 return -ENODEV; 4627 4628 /* verify forwarding is enabled on this interface */ 4629 in_dev = __in_dev_get_rcu(dev); 4630 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 4631 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4632 4633 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4634 fl4.flowi4_iif = 1; 4635 fl4.flowi4_oif = params->ifindex; 4636 } else { 4637 fl4.flowi4_iif = params->ifindex; 4638 fl4.flowi4_oif = 0; 4639 } 4640 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 4641 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 4642 fl4.flowi4_flags = 0; 4643 4644 fl4.flowi4_proto = params->l4_protocol; 4645 fl4.daddr = params->ipv4_dst; 4646 fl4.saddr = params->ipv4_src; 4647 fl4.fl4_sport = params->sport; 4648 fl4.fl4_dport = params->dport; 4649 4650 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4651 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4652 struct fib_table *tb; 4653 4654 tb = fib_get_table(net, tbid); 4655 if (unlikely(!tb)) 4656 return BPF_FIB_LKUP_RET_NOT_FWDED; 4657 4658 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 4659 } else { 4660 fl4.flowi4_mark = 0; 4661 fl4.flowi4_secid = 0; 4662 fl4.flowi4_tun_key.tun_id = 0; 4663 fl4.flowi4_uid = sock_net_uid(net, NULL); 4664 4665 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 4666 } 4667 4668 if (err) { 4669 /* map fib lookup errors to RTN_ type */ 4670 if (err == -EINVAL) 4671 return BPF_FIB_LKUP_RET_BLACKHOLE; 4672 if (err == -EHOSTUNREACH) 4673 return BPF_FIB_LKUP_RET_UNREACHABLE; 4674 if (err == -EACCES) 4675 return BPF_FIB_LKUP_RET_PROHIBIT; 4676 4677 return BPF_FIB_LKUP_RET_NOT_FWDED; 4678 } 4679 4680 if (res.type != RTN_UNICAST) 4681 return BPF_FIB_LKUP_RET_NOT_FWDED; 4682 4683 if (fib_info_num_path(res.fi) > 1) 4684 fib_select_path(net, &res, &fl4, NULL); 4685 4686 if (check_mtu) { 4687 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 4688 if (params->tot_len > mtu) 4689 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4690 } 4691 4692 nhc = res.nhc; 4693 4694 /* do not handle lwt encaps right now */ 4695 if (nhc->nhc_lwtstate) 4696 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4697 4698 dev = nhc->nhc_dev; 4699 4700 params->rt_metric = res.fi->fib_priority; 4701 4702 /* xdp and cls_bpf programs are run in RCU-bh so 4703 * rcu_read_lock_bh is not needed here 4704 */ 4705 if (likely(nhc->nhc_gw_family != AF_INET6)) { 4706 if (nhc->nhc_gw_family) 4707 params->ipv4_dst = nhc->nhc_gw.ipv4; 4708 4709 neigh = __ipv4_neigh_lookup_noref(dev, 4710 (__force u32)params->ipv4_dst); 4711 } else { 4712 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 4713 4714 params->family = AF_INET6; 4715 *dst = nhc->nhc_gw.ipv6; 4716 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4717 } 4718 4719 if (!neigh) 4720 return BPF_FIB_LKUP_RET_NO_NEIGH; 4721 4722 return bpf_fib_set_fwd_params(params, neigh, dev); 4723 } 4724 #endif 4725 4726 #if IS_ENABLED(CONFIG_IPV6) 4727 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4728 u32 flags, bool check_mtu) 4729 { 4730 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 4731 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 4732 struct fib6_result res = {}; 4733 struct neighbour *neigh; 4734 struct net_device *dev; 4735 struct inet6_dev *idev; 4736 struct flowi6 fl6; 4737 int strict = 0; 4738 int oif, err; 4739 u32 mtu; 4740 4741 /* link local addresses are never forwarded */ 4742 if (rt6_need_strict(dst) || rt6_need_strict(src)) 4743 return BPF_FIB_LKUP_RET_NOT_FWDED; 4744 4745 dev = dev_get_by_index_rcu(net, params->ifindex); 4746 if (unlikely(!dev)) 4747 return -ENODEV; 4748 4749 idev = __in6_dev_get_safely(dev); 4750 if (unlikely(!idev || !idev->cnf.forwarding)) 4751 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4752 4753 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4754 fl6.flowi6_iif = 1; 4755 oif = fl6.flowi6_oif = params->ifindex; 4756 } else { 4757 oif = fl6.flowi6_iif = params->ifindex; 4758 fl6.flowi6_oif = 0; 4759 strict = RT6_LOOKUP_F_HAS_SADDR; 4760 } 4761 fl6.flowlabel = params->flowinfo; 4762 fl6.flowi6_scope = 0; 4763 fl6.flowi6_flags = 0; 4764 fl6.mp_hash = 0; 4765 4766 fl6.flowi6_proto = params->l4_protocol; 4767 fl6.daddr = *dst; 4768 fl6.saddr = *src; 4769 fl6.fl6_sport = params->sport; 4770 fl6.fl6_dport = params->dport; 4771 4772 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4773 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4774 struct fib6_table *tb; 4775 4776 tb = ipv6_stub->fib6_get_table(net, tbid); 4777 if (unlikely(!tb)) 4778 return BPF_FIB_LKUP_RET_NOT_FWDED; 4779 4780 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 4781 strict); 4782 } else { 4783 fl6.flowi6_mark = 0; 4784 fl6.flowi6_secid = 0; 4785 fl6.flowi6_tun_key.tun_id = 0; 4786 fl6.flowi6_uid = sock_net_uid(net, NULL); 4787 4788 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 4789 } 4790 4791 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 4792 res.f6i == net->ipv6.fib6_null_entry)) 4793 return BPF_FIB_LKUP_RET_NOT_FWDED; 4794 4795 switch (res.fib6_type) { 4796 /* only unicast is forwarded */ 4797 case RTN_UNICAST: 4798 break; 4799 case RTN_BLACKHOLE: 4800 return BPF_FIB_LKUP_RET_BLACKHOLE; 4801 case RTN_UNREACHABLE: 4802 return BPF_FIB_LKUP_RET_UNREACHABLE; 4803 case RTN_PROHIBIT: 4804 return BPF_FIB_LKUP_RET_PROHIBIT; 4805 default: 4806 return BPF_FIB_LKUP_RET_NOT_FWDED; 4807 } 4808 4809 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 4810 fl6.flowi6_oif != 0, NULL, strict); 4811 4812 if (check_mtu) { 4813 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 4814 if (params->tot_len > mtu) 4815 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4816 } 4817 4818 if (res.nh->fib_nh_lws) 4819 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4820 4821 if (res.nh->fib_nh_gw_family) 4822 *dst = res.nh->fib_nh_gw6; 4823 4824 dev = res.nh->fib_nh_dev; 4825 params->rt_metric = res.f6i->fib6_metric; 4826 4827 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 4828 * not needed here. 4829 */ 4830 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4831 if (!neigh) 4832 return BPF_FIB_LKUP_RET_NO_NEIGH; 4833 4834 return bpf_fib_set_fwd_params(params, neigh, dev); 4835 } 4836 #endif 4837 4838 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 4839 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4840 { 4841 if (plen < sizeof(*params)) 4842 return -EINVAL; 4843 4844 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4845 return -EINVAL; 4846 4847 switch (params->family) { 4848 #if IS_ENABLED(CONFIG_INET) 4849 case AF_INET: 4850 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 4851 flags, true); 4852 #endif 4853 #if IS_ENABLED(CONFIG_IPV6) 4854 case AF_INET6: 4855 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 4856 flags, true); 4857 #endif 4858 } 4859 return -EAFNOSUPPORT; 4860 } 4861 4862 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 4863 .func = bpf_xdp_fib_lookup, 4864 .gpl_only = true, 4865 .ret_type = RET_INTEGER, 4866 .arg1_type = ARG_PTR_TO_CTX, 4867 .arg2_type = ARG_PTR_TO_MEM, 4868 .arg3_type = ARG_CONST_SIZE, 4869 .arg4_type = ARG_ANYTHING, 4870 }; 4871 4872 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 4873 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4874 { 4875 struct net *net = dev_net(skb->dev); 4876 int rc = -EAFNOSUPPORT; 4877 4878 if (plen < sizeof(*params)) 4879 return -EINVAL; 4880 4881 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4882 return -EINVAL; 4883 4884 switch (params->family) { 4885 #if IS_ENABLED(CONFIG_INET) 4886 case AF_INET: 4887 rc = bpf_ipv4_fib_lookup(net, params, flags, false); 4888 break; 4889 #endif 4890 #if IS_ENABLED(CONFIG_IPV6) 4891 case AF_INET6: 4892 rc = bpf_ipv6_fib_lookup(net, params, flags, false); 4893 break; 4894 #endif 4895 } 4896 4897 if (!rc) { 4898 struct net_device *dev; 4899 4900 dev = dev_get_by_index_rcu(net, params->ifindex); 4901 if (!is_skb_forwardable(dev, skb)) 4902 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 4903 } 4904 4905 return rc; 4906 } 4907 4908 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 4909 .func = bpf_skb_fib_lookup, 4910 .gpl_only = true, 4911 .ret_type = RET_INTEGER, 4912 .arg1_type = ARG_PTR_TO_CTX, 4913 .arg2_type = ARG_PTR_TO_MEM, 4914 .arg3_type = ARG_CONST_SIZE, 4915 .arg4_type = ARG_ANYTHING, 4916 }; 4917 4918 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4919 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 4920 { 4921 int err; 4922 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 4923 4924 if (!seg6_validate_srh(srh, len)) 4925 return -EINVAL; 4926 4927 switch (type) { 4928 case BPF_LWT_ENCAP_SEG6_INLINE: 4929 if (skb->protocol != htons(ETH_P_IPV6)) 4930 return -EBADMSG; 4931 4932 err = seg6_do_srh_inline(skb, srh); 4933 break; 4934 case BPF_LWT_ENCAP_SEG6: 4935 skb_reset_inner_headers(skb); 4936 skb->encapsulation = 1; 4937 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 4938 break; 4939 default: 4940 return -EINVAL; 4941 } 4942 4943 bpf_compute_data_pointers(skb); 4944 if (err) 4945 return err; 4946 4947 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 4948 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 4949 4950 return seg6_lookup_nexthop(skb, NULL, 0); 4951 } 4952 #endif /* CONFIG_IPV6_SEG6_BPF */ 4953 4954 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4955 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 4956 bool ingress) 4957 { 4958 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 4959 } 4960 #endif 4961 4962 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 4963 u32, len) 4964 { 4965 switch (type) { 4966 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4967 case BPF_LWT_ENCAP_SEG6: 4968 case BPF_LWT_ENCAP_SEG6_INLINE: 4969 return bpf_push_seg6_encap(skb, type, hdr, len); 4970 #endif 4971 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4972 case BPF_LWT_ENCAP_IP: 4973 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 4974 #endif 4975 default: 4976 return -EINVAL; 4977 } 4978 } 4979 4980 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 4981 void *, hdr, u32, len) 4982 { 4983 switch (type) { 4984 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4985 case BPF_LWT_ENCAP_IP: 4986 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 4987 #endif 4988 default: 4989 return -EINVAL; 4990 } 4991 } 4992 4993 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 4994 .func = bpf_lwt_in_push_encap, 4995 .gpl_only = false, 4996 .ret_type = RET_INTEGER, 4997 .arg1_type = ARG_PTR_TO_CTX, 4998 .arg2_type = ARG_ANYTHING, 4999 .arg3_type = ARG_PTR_TO_MEM, 5000 .arg4_type = ARG_CONST_SIZE 5001 }; 5002 5003 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 5004 .func = bpf_lwt_xmit_push_encap, 5005 .gpl_only = false, 5006 .ret_type = RET_INTEGER, 5007 .arg1_type = ARG_PTR_TO_CTX, 5008 .arg2_type = ARG_ANYTHING, 5009 .arg3_type = ARG_PTR_TO_MEM, 5010 .arg4_type = ARG_CONST_SIZE 5011 }; 5012 5013 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5014 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 5015 const void *, from, u32, len) 5016 { 5017 struct seg6_bpf_srh_state *srh_state = 5018 this_cpu_ptr(&seg6_bpf_srh_states); 5019 struct ipv6_sr_hdr *srh = srh_state->srh; 5020 void *srh_tlvs, *srh_end, *ptr; 5021 int srhoff = 0; 5022 5023 if (srh == NULL) 5024 return -EINVAL; 5025 5026 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 5027 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 5028 5029 ptr = skb->data + offset; 5030 if (ptr >= srh_tlvs && ptr + len <= srh_end) 5031 srh_state->valid = false; 5032 else if (ptr < (void *)&srh->flags || 5033 ptr + len > (void *)&srh->segments) 5034 return -EFAULT; 5035 5036 if (unlikely(bpf_try_make_writable(skb, offset + len))) 5037 return -EFAULT; 5038 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5039 return -EINVAL; 5040 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5041 5042 memcpy(skb->data + offset, from, len); 5043 return 0; 5044 } 5045 5046 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 5047 .func = bpf_lwt_seg6_store_bytes, 5048 .gpl_only = false, 5049 .ret_type = RET_INTEGER, 5050 .arg1_type = ARG_PTR_TO_CTX, 5051 .arg2_type = ARG_ANYTHING, 5052 .arg3_type = ARG_PTR_TO_MEM, 5053 .arg4_type = ARG_CONST_SIZE 5054 }; 5055 5056 static void bpf_update_srh_state(struct sk_buff *skb) 5057 { 5058 struct seg6_bpf_srh_state *srh_state = 5059 this_cpu_ptr(&seg6_bpf_srh_states); 5060 int srhoff = 0; 5061 5062 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 5063 srh_state->srh = NULL; 5064 } else { 5065 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5066 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 5067 srh_state->valid = true; 5068 } 5069 } 5070 5071 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 5072 u32, action, void *, param, u32, param_len) 5073 { 5074 struct seg6_bpf_srh_state *srh_state = 5075 this_cpu_ptr(&seg6_bpf_srh_states); 5076 int hdroff = 0; 5077 int err; 5078 5079 switch (action) { 5080 case SEG6_LOCAL_ACTION_END_X: 5081 if (!seg6_bpf_has_valid_srh(skb)) 5082 return -EBADMSG; 5083 if (param_len != sizeof(struct in6_addr)) 5084 return -EINVAL; 5085 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 5086 case SEG6_LOCAL_ACTION_END_T: 5087 if (!seg6_bpf_has_valid_srh(skb)) 5088 return -EBADMSG; 5089 if (param_len != sizeof(int)) 5090 return -EINVAL; 5091 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5092 case SEG6_LOCAL_ACTION_END_DT6: 5093 if (!seg6_bpf_has_valid_srh(skb)) 5094 return -EBADMSG; 5095 if (param_len != sizeof(int)) 5096 return -EINVAL; 5097 5098 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 5099 return -EBADMSG; 5100 if (!pskb_pull(skb, hdroff)) 5101 return -EBADMSG; 5102 5103 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 5104 skb_reset_network_header(skb); 5105 skb_reset_transport_header(skb); 5106 skb->encapsulation = 0; 5107 5108 bpf_compute_data_pointers(skb); 5109 bpf_update_srh_state(skb); 5110 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5111 case SEG6_LOCAL_ACTION_END_B6: 5112 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5113 return -EBADMSG; 5114 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 5115 param, param_len); 5116 if (!err) 5117 bpf_update_srh_state(skb); 5118 5119 return err; 5120 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 5121 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5122 return -EBADMSG; 5123 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 5124 param, param_len); 5125 if (!err) 5126 bpf_update_srh_state(skb); 5127 5128 return err; 5129 default: 5130 return -EINVAL; 5131 } 5132 } 5133 5134 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 5135 .func = bpf_lwt_seg6_action, 5136 .gpl_only = false, 5137 .ret_type = RET_INTEGER, 5138 .arg1_type = ARG_PTR_TO_CTX, 5139 .arg2_type = ARG_ANYTHING, 5140 .arg3_type = ARG_PTR_TO_MEM, 5141 .arg4_type = ARG_CONST_SIZE 5142 }; 5143 5144 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 5145 s32, len) 5146 { 5147 struct seg6_bpf_srh_state *srh_state = 5148 this_cpu_ptr(&seg6_bpf_srh_states); 5149 struct ipv6_sr_hdr *srh = srh_state->srh; 5150 void *srh_end, *srh_tlvs, *ptr; 5151 struct ipv6hdr *hdr; 5152 int srhoff = 0; 5153 int ret; 5154 5155 if (unlikely(srh == NULL)) 5156 return -EINVAL; 5157 5158 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 5159 ((srh->first_segment + 1) << 4)); 5160 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 5161 srh_state->hdrlen); 5162 ptr = skb->data + offset; 5163 5164 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 5165 return -EFAULT; 5166 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 5167 return -EFAULT; 5168 5169 if (len > 0) { 5170 ret = skb_cow_head(skb, len); 5171 if (unlikely(ret < 0)) 5172 return ret; 5173 5174 ret = bpf_skb_net_hdr_push(skb, offset, len); 5175 } else { 5176 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 5177 } 5178 5179 bpf_compute_data_pointers(skb); 5180 if (unlikely(ret < 0)) 5181 return ret; 5182 5183 hdr = (struct ipv6hdr *)skb->data; 5184 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 5185 5186 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5187 return -EINVAL; 5188 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5189 srh_state->hdrlen += len; 5190 srh_state->valid = false; 5191 return 0; 5192 } 5193 5194 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 5195 .func = bpf_lwt_seg6_adjust_srh, 5196 .gpl_only = false, 5197 .ret_type = RET_INTEGER, 5198 .arg1_type = ARG_PTR_TO_CTX, 5199 .arg2_type = ARG_ANYTHING, 5200 .arg3_type = ARG_ANYTHING, 5201 }; 5202 #endif /* CONFIG_IPV6_SEG6_BPF */ 5203 5204 #ifdef CONFIG_INET 5205 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 5206 int dif, int sdif, u8 family, u8 proto) 5207 { 5208 bool refcounted = false; 5209 struct sock *sk = NULL; 5210 5211 if (family == AF_INET) { 5212 __be32 src4 = tuple->ipv4.saddr; 5213 __be32 dst4 = tuple->ipv4.daddr; 5214 5215 if (proto == IPPROTO_TCP) 5216 sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, 5217 src4, tuple->ipv4.sport, 5218 dst4, tuple->ipv4.dport, 5219 dif, sdif, &refcounted); 5220 else 5221 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 5222 dst4, tuple->ipv4.dport, 5223 dif, sdif, &udp_table, NULL); 5224 #if IS_ENABLED(CONFIG_IPV6) 5225 } else { 5226 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 5227 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 5228 5229 if (proto == IPPROTO_TCP) 5230 sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, 5231 src6, tuple->ipv6.sport, 5232 dst6, ntohs(tuple->ipv6.dport), 5233 dif, sdif, &refcounted); 5234 else if (likely(ipv6_bpf_stub)) 5235 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 5236 src6, tuple->ipv6.sport, 5237 dst6, tuple->ipv6.dport, 5238 dif, sdif, 5239 &udp_table, NULL); 5240 #endif 5241 } 5242 5243 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 5244 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 5245 sk = NULL; 5246 } 5247 return sk; 5248 } 5249 5250 /* bpf_skc_lookup performs the core lookup for different types of sockets, 5251 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 5252 * Returns the socket as an 'unsigned long' to simplify the casting in the 5253 * callers to satisfy BPF_CALL declarations. 5254 */ 5255 static struct sock * 5256 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5257 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5258 u64 flags) 5259 { 5260 struct sock *sk = NULL; 5261 u8 family = AF_UNSPEC; 5262 struct net *net; 5263 int sdif; 5264 5265 if (len == sizeof(tuple->ipv4)) 5266 family = AF_INET; 5267 else if (len == sizeof(tuple->ipv6)) 5268 family = AF_INET6; 5269 else 5270 return NULL; 5271 5272 if (unlikely(family == AF_UNSPEC || flags || 5273 !((s32)netns_id < 0 || netns_id <= S32_MAX))) 5274 goto out; 5275 5276 if (family == AF_INET) 5277 sdif = inet_sdif(skb); 5278 else 5279 sdif = inet6_sdif(skb); 5280 5281 if ((s32)netns_id < 0) { 5282 net = caller_net; 5283 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5284 } else { 5285 net = get_net_ns_by_id(caller_net, netns_id); 5286 if (unlikely(!net)) 5287 goto out; 5288 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5289 put_net(net); 5290 } 5291 5292 out: 5293 return sk; 5294 } 5295 5296 static struct sock * 5297 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5298 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5299 u64 flags) 5300 { 5301 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 5302 ifindex, proto, netns_id, flags); 5303 5304 if (sk) { 5305 sk = sk_to_full_sk(sk); 5306 if (!sk_fullsock(sk)) { 5307 if (!sock_flag(sk, SOCK_RCU_FREE)) 5308 sock_gen_put(sk); 5309 return NULL; 5310 } 5311 } 5312 5313 return sk; 5314 } 5315 5316 static struct sock * 5317 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5318 u8 proto, u64 netns_id, u64 flags) 5319 { 5320 struct net *caller_net; 5321 int ifindex; 5322 5323 if (skb->dev) { 5324 caller_net = dev_net(skb->dev); 5325 ifindex = skb->dev->ifindex; 5326 } else { 5327 caller_net = sock_net(skb->sk); 5328 ifindex = 0; 5329 } 5330 5331 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 5332 netns_id, flags); 5333 } 5334 5335 static struct sock * 5336 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5337 u8 proto, u64 netns_id, u64 flags) 5338 { 5339 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 5340 flags); 5341 5342 if (sk) { 5343 sk = sk_to_full_sk(sk); 5344 if (!sk_fullsock(sk)) { 5345 if (!sock_flag(sk, SOCK_RCU_FREE)) 5346 sock_gen_put(sk); 5347 return NULL; 5348 } 5349 } 5350 5351 return sk; 5352 } 5353 5354 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 5355 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5356 { 5357 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 5358 netns_id, flags); 5359 } 5360 5361 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 5362 .func = bpf_skc_lookup_tcp, 5363 .gpl_only = false, 5364 .pkt_access = true, 5365 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5366 .arg1_type = ARG_PTR_TO_CTX, 5367 .arg2_type = ARG_PTR_TO_MEM, 5368 .arg3_type = ARG_CONST_SIZE, 5369 .arg4_type = ARG_ANYTHING, 5370 .arg5_type = ARG_ANYTHING, 5371 }; 5372 5373 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 5374 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5375 { 5376 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 5377 netns_id, flags); 5378 } 5379 5380 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 5381 .func = bpf_sk_lookup_tcp, 5382 .gpl_only = false, 5383 .pkt_access = true, 5384 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5385 .arg1_type = ARG_PTR_TO_CTX, 5386 .arg2_type = ARG_PTR_TO_MEM, 5387 .arg3_type = ARG_CONST_SIZE, 5388 .arg4_type = ARG_ANYTHING, 5389 .arg5_type = ARG_ANYTHING, 5390 }; 5391 5392 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 5393 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5394 { 5395 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 5396 netns_id, flags); 5397 } 5398 5399 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 5400 .func = bpf_sk_lookup_udp, 5401 .gpl_only = false, 5402 .pkt_access = true, 5403 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5404 .arg1_type = ARG_PTR_TO_CTX, 5405 .arg2_type = ARG_PTR_TO_MEM, 5406 .arg3_type = ARG_CONST_SIZE, 5407 .arg4_type = ARG_ANYTHING, 5408 .arg5_type = ARG_ANYTHING, 5409 }; 5410 5411 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 5412 { 5413 if (!sock_flag(sk, SOCK_RCU_FREE)) 5414 sock_gen_put(sk); 5415 return 0; 5416 } 5417 5418 static const struct bpf_func_proto bpf_sk_release_proto = { 5419 .func = bpf_sk_release, 5420 .gpl_only = false, 5421 .ret_type = RET_INTEGER, 5422 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5423 }; 5424 5425 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 5426 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5427 { 5428 struct net *caller_net = dev_net(ctx->rxq->dev); 5429 int ifindex = ctx->rxq->dev->ifindex; 5430 5431 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5432 ifindex, IPPROTO_UDP, netns_id, 5433 flags); 5434 } 5435 5436 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 5437 .func = bpf_xdp_sk_lookup_udp, 5438 .gpl_only = false, 5439 .pkt_access = true, 5440 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5441 .arg1_type = ARG_PTR_TO_CTX, 5442 .arg2_type = ARG_PTR_TO_MEM, 5443 .arg3_type = ARG_CONST_SIZE, 5444 .arg4_type = ARG_ANYTHING, 5445 .arg5_type = ARG_ANYTHING, 5446 }; 5447 5448 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 5449 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5450 { 5451 struct net *caller_net = dev_net(ctx->rxq->dev); 5452 int ifindex = ctx->rxq->dev->ifindex; 5453 5454 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 5455 ifindex, IPPROTO_TCP, netns_id, 5456 flags); 5457 } 5458 5459 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 5460 .func = bpf_xdp_skc_lookup_tcp, 5461 .gpl_only = false, 5462 .pkt_access = true, 5463 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5464 .arg1_type = ARG_PTR_TO_CTX, 5465 .arg2_type = ARG_PTR_TO_MEM, 5466 .arg3_type = ARG_CONST_SIZE, 5467 .arg4_type = ARG_ANYTHING, 5468 .arg5_type = ARG_ANYTHING, 5469 }; 5470 5471 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 5472 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5473 { 5474 struct net *caller_net = dev_net(ctx->rxq->dev); 5475 int ifindex = ctx->rxq->dev->ifindex; 5476 5477 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5478 ifindex, IPPROTO_TCP, netns_id, 5479 flags); 5480 } 5481 5482 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 5483 .func = bpf_xdp_sk_lookup_tcp, 5484 .gpl_only = false, 5485 .pkt_access = true, 5486 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5487 .arg1_type = ARG_PTR_TO_CTX, 5488 .arg2_type = ARG_PTR_TO_MEM, 5489 .arg3_type = ARG_CONST_SIZE, 5490 .arg4_type = ARG_ANYTHING, 5491 .arg5_type = ARG_ANYTHING, 5492 }; 5493 5494 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5495 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5496 { 5497 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 5498 sock_net(ctx->sk), 0, 5499 IPPROTO_TCP, netns_id, flags); 5500 } 5501 5502 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 5503 .func = bpf_sock_addr_skc_lookup_tcp, 5504 .gpl_only = false, 5505 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5506 .arg1_type = ARG_PTR_TO_CTX, 5507 .arg2_type = ARG_PTR_TO_MEM, 5508 .arg3_type = ARG_CONST_SIZE, 5509 .arg4_type = ARG_ANYTHING, 5510 .arg5_type = ARG_ANYTHING, 5511 }; 5512 5513 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5514 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5515 { 5516 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5517 sock_net(ctx->sk), 0, IPPROTO_TCP, 5518 netns_id, flags); 5519 } 5520 5521 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 5522 .func = bpf_sock_addr_sk_lookup_tcp, 5523 .gpl_only = false, 5524 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5525 .arg1_type = ARG_PTR_TO_CTX, 5526 .arg2_type = ARG_PTR_TO_MEM, 5527 .arg3_type = ARG_CONST_SIZE, 5528 .arg4_type = ARG_ANYTHING, 5529 .arg5_type = ARG_ANYTHING, 5530 }; 5531 5532 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 5533 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5534 { 5535 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5536 sock_net(ctx->sk), 0, IPPROTO_UDP, 5537 netns_id, flags); 5538 } 5539 5540 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 5541 .func = bpf_sock_addr_sk_lookup_udp, 5542 .gpl_only = false, 5543 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5544 .arg1_type = ARG_PTR_TO_CTX, 5545 .arg2_type = ARG_PTR_TO_MEM, 5546 .arg3_type = ARG_CONST_SIZE, 5547 .arg4_type = ARG_ANYTHING, 5548 .arg5_type = ARG_ANYTHING, 5549 }; 5550 5551 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5552 struct bpf_insn_access_aux *info) 5553 { 5554 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 5555 icsk_retransmits)) 5556 return false; 5557 5558 if (off % size != 0) 5559 return false; 5560 5561 switch (off) { 5562 case offsetof(struct bpf_tcp_sock, bytes_received): 5563 case offsetof(struct bpf_tcp_sock, bytes_acked): 5564 return size == sizeof(__u64); 5565 default: 5566 return size == sizeof(__u32); 5567 } 5568 } 5569 5570 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 5571 const struct bpf_insn *si, 5572 struct bpf_insn *insn_buf, 5573 struct bpf_prog *prog, u32 *target_size) 5574 { 5575 struct bpf_insn *insn = insn_buf; 5576 5577 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 5578 do { \ 5579 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, FIELD) > \ 5580 FIELD_SIZEOF(struct bpf_tcp_sock, FIELD)); \ 5581 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 5582 si->dst_reg, si->src_reg, \ 5583 offsetof(struct tcp_sock, FIELD)); \ 5584 } while (0) 5585 5586 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 5587 do { \ 5588 BUILD_BUG_ON(FIELD_SIZEOF(struct inet_connection_sock, \ 5589 FIELD) > \ 5590 FIELD_SIZEOF(struct bpf_tcp_sock, FIELD)); \ 5591 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 5592 struct inet_connection_sock, \ 5593 FIELD), \ 5594 si->dst_reg, si->src_reg, \ 5595 offsetof( \ 5596 struct inet_connection_sock, \ 5597 FIELD)); \ 5598 } while (0) 5599 5600 if (insn > insn_buf) 5601 return insn - insn_buf; 5602 5603 switch (si->off) { 5604 case offsetof(struct bpf_tcp_sock, rtt_min): 5605 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != 5606 sizeof(struct minmax)); 5607 BUILD_BUG_ON(sizeof(struct minmax) < 5608 sizeof(struct minmax_sample)); 5609 5610 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 5611 offsetof(struct tcp_sock, rtt_min) + 5612 offsetof(struct minmax_sample, v)); 5613 break; 5614 case offsetof(struct bpf_tcp_sock, snd_cwnd): 5615 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 5616 break; 5617 case offsetof(struct bpf_tcp_sock, srtt_us): 5618 BPF_TCP_SOCK_GET_COMMON(srtt_us); 5619 break; 5620 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 5621 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 5622 break; 5623 case offsetof(struct bpf_tcp_sock, rcv_nxt): 5624 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 5625 break; 5626 case offsetof(struct bpf_tcp_sock, snd_nxt): 5627 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 5628 break; 5629 case offsetof(struct bpf_tcp_sock, snd_una): 5630 BPF_TCP_SOCK_GET_COMMON(snd_una); 5631 break; 5632 case offsetof(struct bpf_tcp_sock, mss_cache): 5633 BPF_TCP_SOCK_GET_COMMON(mss_cache); 5634 break; 5635 case offsetof(struct bpf_tcp_sock, ecn_flags): 5636 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 5637 break; 5638 case offsetof(struct bpf_tcp_sock, rate_delivered): 5639 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 5640 break; 5641 case offsetof(struct bpf_tcp_sock, rate_interval_us): 5642 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 5643 break; 5644 case offsetof(struct bpf_tcp_sock, packets_out): 5645 BPF_TCP_SOCK_GET_COMMON(packets_out); 5646 break; 5647 case offsetof(struct bpf_tcp_sock, retrans_out): 5648 BPF_TCP_SOCK_GET_COMMON(retrans_out); 5649 break; 5650 case offsetof(struct bpf_tcp_sock, total_retrans): 5651 BPF_TCP_SOCK_GET_COMMON(total_retrans); 5652 break; 5653 case offsetof(struct bpf_tcp_sock, segs_in): 5654 BPF_TCP_SOCK_GET_COMMON(segs_in); 5655 break; 5656 case offsetof(struct bpf_tcp_sock, data_segs_in): 5657 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 5658 break; 5659 case offsetof(struct bpf_tcp_sock, segs_out): 5660 BPF_TCP_SOCK_GET_COMMON(segs_out); 5661 break; 5662 case offsetof(struct bpf_tcp_sock, data_segs_out): 5663 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 5664 break; 5665 case offsetof(struct bpf_tcp_sock, lost_out): 5666 BPF_TCP_SOCK_GET_COMMON(lost_out); 5667 break; 5668 case offsetof(struct bpf_tcp_sock, sacked_out): 5669 BPF_TCP_SOCK_GET_COMMON(sacked_out); 5670 break; 5671 case offsetof(struct bpf_tcp_sock, bytes_received): 5672 BPF_TCP_SOCK_GET_COMMON(bytes_received); 5673 break; 5674 case offsetof(struct bpf_tcp_sock, bytes_acked): 5675 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 5676 break; 5677 case offsetof(struct bpf_tcp_sock, dsack_dups): 5678 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 5679 break; 5680 case offsetof(struct bpf_tcp_sock, delivered): 5681 BPF_TCP_SOCK_GET_COMMON(delivered); 5682 break; 5683 case offsetof(struct bpf_tcp_sock, delivered_ce): 5684 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 5685 break; 5686 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 5687 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 5688 break; 5689 } 5690 5691 return insn - insn_buf; 5692 } 5693 5694 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 5695 { 5696 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 5697 return (unsigned long)sk; 5698 5699 return (unsigned long)NULL; 5700 } 5701 5702 const struct bpf_func_proto bpf_tcp_sock_proto = { 5703 .func = bpf_tcp_sock, 5704 .gpl_only = false, 5705 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 5706 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5707 }; 5708 5709 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 5710 { 5711 sk = sk_to_full_sk(sk); 5712 5713 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 5714 return (unsigned long)sk; 5715 5716 return (unsigned long)NULL; 5717 } 5718 5719 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 5720 .func = bpf_get_listener_sock, 5721 .gpl_only = false, 5722 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5723 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5724 }; 5725 5726 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 5727 { 5728 unsigned int iphdr_len; 5729 5730 if (skb->protocol == cpu_to_be16(ETH_P_IP)) 5731 iphdr_len = sizeof(struct iphdr); 5732 else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) 5733 iphdr_len = sizeof(struct ipv6hdr); 5734 else 5735 return 0; 5736 5737 if (skb_headlen(skb) < iphdr_len) 5738 return 0; 5739 5740 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 5741 return 0; 5742 5743 return INET_ECN_set_ce(skb); 5744 } 5745 5746 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5747 struct bpf_insn_access_aux *info) 5748 { 5749 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 5750 return false; 5751 5752 if (off % size != 0) 5753 return false; 5754 5755 switch (off) { 5756 default: 5757 return size == sizeof(__u32); 5758 } 5759 } 5760 5761 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 5762 const struct bpf_insn *si, 5763 struct bpf_insn *insn_buf, 5764 struct bpf_prog *prog, u32 *target_size) 5765 { 5766 struct bpf_insn *insn = insn_buf; 5767 5768 #define BPF_XDP_SOCK_GET(FIELD) \ 5769 do { \ 5770 BUILD_BUG_ON(FIELD_SIZEOF(struct xdp_sock, FIELD) > \ 5771 FIELD_SIZEOF(struct bpf_xdp_sock, FIELD)); \ 5772 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 5773 si->dst_reg, si->src_reg, \ 5774 offsetof(struct xdp_sock, FIELD)); \ 5775 } while (0) 5776 5777 switch (si->off) { 5778 case offsetof(struct bpf_xdp_sock, queue_id): 5779 BPF_XDP_SOCK_GET(queue_id); 5780 break; 5781 } 5782 5783 return insn - insn_buf; 5784 } 5785 5786 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 5787 .func = bpf_skb_ecn_set_ce, 5788 .gpl_only = false, 5789 .ret_type = RET_INTEGER, 5790 .arg1_type = ARG_PTR_TO_CTX, 5791 }; 5792 5793 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 5794 struct tcphdr *, th, u32, th_len) 5795 { 5796 #ifdef CONFIG_SYN_COOKIES 5797 u32 cookie; 5798 int ret; 5799 5800 if (unlikely(th_len < sizeof(*th))) 5801 return -EINVAL; 5802 5803 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 5804 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 5805 return -EINVAL; 5806 5807 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 5808 return -EINVAL; 5809 5810 if (!th->ack || th->rst || th->syn) 5811 return -ENOENT; 5812 5813 if (tcp_synq_no_recent_overflow(sk)) 5814 return -ENOENT; 5815 5816 cookie = ntohl(th->ack_seq) - 1; 5817 5818 switch (sk->sk_family) { 5819 case AF_INET: 5820 if (unlikely(iph_len < sizeof(struct iphdr))) 5821 return -EINVAL; 5822 5823 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 5824 break; 5825 5826 #if IS_BUILTIN(CONFIG_IPV6) 5827 case AF_INET6: 5828 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 5829 return -EINVAL; 5830 5831 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 5832 break; 5833 #endif /* CONFIG_IPV6 */ 5834 5835 default: 5836 return -EPROTONOSUPPORT; 5837 } 5838 5839 if (ret > 0) 5840 return 0; 5841 5842 return -ENOENT; 5843 #else 5844 return -ENOTSUPP; 5845 #endif 5846 } 5847 5848 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 5849 .func = bpf_tcp_check_syncookie, 5850 .gpl_only = true, 5851 .pkt_access = true, 5852 .ret_type = RET_INTEGER, 5853 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5854 .arg2_type = ARG_PTR_TO_MEM, 5855 .arg3_type = ARG_CONST_SIZE, 5856 .arg4_type = ARG_PTR_TO_MEM, 5857 .arg5_type = ARG_CONST_SIZE, 5858 }; 5859 5860 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 5861 struct tcphdr *, th, u32, th_len) 5862 { 5863 #ifdef CONFIG_SYN_COOKIES 5864 u32 cookie; 5865 u16 mss; 5866 5867 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 5868 return -EINVAL; 5869 5870 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 5871 return -EINVAL; 5872 5873 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 5874 return -ENOENT; 5875 5876 if (!th->syn || th->ack || th->fin || th->rst) 5877 return -EINVAL; 5878 5879 if (unlikely(iph_len < sizeof(struct iphdr))) 5880 return -EINVAL; 5881 5882 /* Both struct iphdr and struct ipv6hdr have the version field at the 5883 * same offset so we can cast to the shorter header (struct iphdr). 5884 */ 5885 switch (((struct iphdr *)iph)->version) { 5886 case 4: 5887 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only) 5888 return -EINVAL; 5889 5890 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 5891 break; 5892 5893 #if IS_BUILTIN(CONFIG_IPV6) 5894 case 6: 5895 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 5896 return -EINVAL; 5897 5898 if (sk->sk_family != AF_INET6) 5899 return -EINVAL; 5900 5901 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 5902 break; 5903 #endif /* CONFIG_IPV6 */ 5904 5905 default: 5906 return -EPROTONOSUPPORT; 5907 } 5908 if (mss == 0) 5909 return -ENOENT; 5910 5911 return cookie | ((u64)mss << 32); 5912 #else 5913 return -EOPNOTSUPP; 5914 #endif /* CONFIG_SYN_COOKIES */ 5915 } 5916 5917 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 5918 .func = bpf_tcp_gen_syncookie, 5919 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 5920 .pkt_access = true, 5921 .ret_type = RET_INTEGER, 5922 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5923 .arg2_type = ARG_PTR_TO_MEM, 5924 .arg3_type = ARG_CONST_SIZE, 5925 .arg4_type = ARG_PTR_TO_MEM, 5926 .arg5_type = ARG_CONST_SIZE, 5927 }; 5928 5929 #endif /* CONFIG_INET */ 5930 5931 bool bpf_helper_changes_pkt_data(void *func) 5932 { 5933 if (func == bpf_skb_vlan_push || 5934 func == bpf_skb_vlan_pop || 5935 func == bpf_skb_store_bytes || 5936 func == bpf_skb_change_proto || 5937 func == bpf_skb_change_head || 5938 func == sk_skb_change_head || 5939 func == bpf_skb_change_tail || 5940 func == sk_skb_change_tail || 5941 func == bpf_skb_adjust_room || 5942 func == bpf_skb_pull_data || 5943 func == sk_skb_pull_data || 5944 func == bpf_clone_redirect || 5945 func == bpf_l3_csum_replace || 5946 func == bpf_l4_csum_replace || 5947 func == bpf_xdp_adjust_head || 5948 func == bpf_xdp_adjust_meta || 5949 func == bpf_msg_pull_data || 5950 func == bpf_msg_push_data || 5951 func == bpf_msg_pop_data || 5952 func == bpf_xdp_adjust_tail || 5953 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5954 func == bpf_lwt_seg6_store_bytes || 5955 func == bpf_lwt_seg6_adjust_srh || 5956 func == bpf_lwt_seg6_action || 5957 #endif 5958 func == bpf_lwt_in_push_encap || 5959 func == bpf_lwt_xmit_push_encap) 5960 return true; 5961 5962 return false; 5963 } 5964 5965 static const struct bpf_func_proto * 5966 bpf_base_func_proto(enum bpf_func_id func_id) 5967 { 5968 switch (func_id) { 5969 case BPF_FUNC_map_lookup_elem: 5970 return &bpf_map_lookup_elem_proto; 5971 case BPF_FUNC_map_update_elem: 5972 return &bpf_map_update_elem_proto; 5973 case BPF_FUNC_map_delete_elem: 5974 return &bpf_map_delete_elem_proto; 5975 case BPF_FUNC_map_push_elem: 5976 return &bpf_map_push_elem_proto; 5977 case BPF_FUNC_map_pop_elem: 5978 return &bpf_map_pop_elem_proto; 5979 case BPF_FUNC_map_peek_elem: 5980 return &bpf_map_peek_elem_proto; 5981 case BPF_FUNC_get_prandom_u32: 5982 return &bpf_get_prandom_u32_proto; 5983 case BPF_FUNC_get_smp_processor_id: 5984 return &bpf_get_raw_smp_processor_id_proto; 5985 case BPF_FUNC_get_numa_node_id: 5986 return &bpf_get_numa_node_id_proto; 5987 case BPF_FUNC_tail_call: 5988 return &bpf_tail_call_proto; 5989 case BPF_FUNC_ktime_get_ns: 5990 return &bpf_ktime_get_ns_proto; 5991 default: 5992 break; 5993 } 5994 5995 if (!capable(CAP_SYS_ADMIN)) 5996 return NULL; 5997 5998 switch (func_id) { 5999 case BPF_FUNC_spin_lock: 6000 return &bpf_spin_lock_proto; 6001 case BPF_FUNC_spin_unlock: 6002 return &bpf_spin_unlock_proto; 6003 case BPF_FUNC_trace_printk: 6004 return bpf_get_trace_printk_proto(); 6005 default: 6006 return NULL; 6007 } 6008 } 6009 6010 static const struct bpf_func_proto * 6011 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6012 { 6013 switch (func_id) { 6014 /* inet and inet6 sockets are created in a process 6015 * context so there is always a valid uid/gid 6016 */ 6017 case BPF_FUNC_get_current_uid_gid: 6018 return &bpf_get_current_uid_gid_proto; 6019 case BPF_FUNC_get_local_storage: 6020 return &bpf_get_local_storage_proto; 6021 default: 6022 return bpf_base_func_proto(func_id); 6023 } 6024 } 6025 6026 static const struct bpf_func_proto * 6027 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6028 { 6029 switch (func_id) { 6030 /* inet and inet6 sockets are created in a process 6031 * context so there is always a valid uid/gid 6032 */ 6033 case BPF_FUNC_get_current_uid_gid: 6034 return &bpf_get_current_uid_gid_proto; 6035 case BPF_FUNC_bind: 6036 switch (prog->expected_attach_type) { 6037 case BPF_CGROUP_INET4_CONNECT: 6038 case BPF_CGROUP_INET6_CONNECT: 6039 return &bpf_bind_proto; 6040 default: 6041 return NULL; 6042 } 6043 case BPF_FUNC_get_socket_cookie: 6044 return &bpf_get_socket_cookie_sock_addr_proto; 6045 case BPF_FUNC_get_local_storage: 6046 return &bpf_get_local_storage_proto; 6047 #ifdef CONFIG_INET 6048 case BPF_FUNC_sk_lookup_tcp: 6049 return &bpf_sock_addr_sk_lookup_tcp_proto; 6050 case BPF_FUNC_sk_lookup_udp: 6051 return &bpf_sock_addr_sk_lookup_udp_proto; 6052 case BPF_FUNC_sk_release: 6053 return &bpf_sk_release_proto; 6054 case BPF_FUNC_skc_lookup_tcp: 6055 return &bpf_sock_addr_skc_lookup_tcp_proto; 6056 #endif /* CONFIG_INET */ 6057 case BPF_FUNC_sk_storage_get: 6058 return &bpf_sk_storage_get_proto; 6059 case BPF_FUNC_sk_storage_delete: 6060 return &bpf_sk_storage_delete_proto; 6061 default: 6062 return bpf_base_func_proto(func_id); 6063 } 6064 } 6065 6066 static const struct bpf_func_proto * 6067 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6068 { 6069 switch (func_id) { 6070 case BPF_FUNC_skb_load_bytes: 6071 return &bpf_skb_load_bytes_proto; 6072 case BPF_FUNC_skb_load_bytes_relative: 6073 return &bpf_skb_load_bytes_relative_proto; 6074 case BPF_FUNC_get_socket_cookie: 6075 return &bpf_get_socket_cookie_proto; 6076 case BPF_FUNC_get_socket_uid: 6077 return &bpf_get_socket_uid_proto; 6078 case BPF_FUNC_perf_event_output: 6079 return &bpf_skb_event_output_proto; 6080 default: 6081 return bpf_base_func_proto(func_id); 6082 } 6083 } 6084 6085 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 6086 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 6087 6088 static const struct bpf_func_proto * 6089 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6090 { 6091 switch (func_id) { 6092 case BPF_FUNC_get_local_storage: 6093 return &bpf_get_local_storage_proto; 6094 case BPF_FUNC_sk_fullsock: 6095 return &bpf_sk_fullsock_proto; 6096 case BPF_FUNC_sk_storage_get: 6097 return &bpf_sk_storage_get_proto; 6098 case BPF_FUNC_sk_storage_delete: 6099 return &bpf_sk_storage_delete_proto; 6100 case BPF_FUNC_perf_event_output: 6101 return &bpf_skb_event_output_proto; 6102 #ifdef CONFIG_SOCK_CGROUP_DATA 6103 case BPF_FUNC_skb_cgroup_id: 6104 return &bpf_skb_cgroup_id_proto; 6105 #endif 6106 #ifdef CONFIG_INET 6107 case BPF_FUNC_tcp_sock: 6108 return &bpf_tcp_sock_proto; 6109 case BPF_FUNC_get_listener_sock: 6110 return &bpf_get_listener_sock_proto; 6111 case BPF_FUNC_skb_ecn_set_ce: 6112 return &bpf_skb_ecn_set_ce_proto; 6113 #endif 6114 default: 6115 return sk_filter_func_proto(func_id, prog); 6116 } 6117 } 6118 6119 static const struct bpf_func_proto * 6120 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6121 { 6122 switch (func_id) { 6123 case BPF_FUNC_skb_store_bytes: 6124 return &bpf_skb_store_bytes_proto; 6125 case BPF_FUNC_skb_load_bytes: 6126 return &bpf_skb_load_bytes_proto; 6127 case BPF_FUNC_skb_load_bytes_relative: 6128 return &bpf_skb_load_bytes_relative_proto; 6129 case BPF_FUNC_skb_pull_data: 6130 return &bpf_skb_pull_data_proto; 6131 case BPF_FUNC_csum_diff: 6132 return &bpf_csum_diff_proto; 6133 case BPF_FUNC_csum_update: 6134 return &bpf_csum_update_proto; 6135 case BPF_FUNC_l3_csum_replace: 6136 return &bpf_l3_csum_replace_proto; 6137 case BPF_FUNC_l4_csum_replace: 6138 return &bpf_l4_csum_replace_proto; 6139 case BPF_FUNC_clone_redirect: 6140 return &bpf_clone_redirect_proto; 6141 case BPF_FUNC_get_cgroup_classid: 6142 return &bpf_get_cgroup_classid_proto; 6143 case BPF_FUNC_skb_vlan_push: 6144 return &bpf_skb_vlan_push_proto; 6145 case BPF_FUNC_skb_vlan_pop: 6146 return &bpf_skb_vlan_pop_proto; 6147 case BPF_FUNC_skb_change_proto: 6148 return &bpf_skb_change_proto_proto; 6149 case BPF_FUNC_skb_change_type: 6150 return &bpf_skb_change_type_proto; 6151 case BPF_FUNC_skb_adjust_room: 6152 return &bpf_skb_adjust_room_proto; 6153 case BPF_FUNC_skb_change_tail: 6154 return &bpf_skb_change_tail_proto; 6155 case BPF_FUNC_skb_get_tunnel_key: 6156 return &bpf_skb_get_tunnel_key_proto; 6157 case BPF_FUNC_skb_set_tunnel_key: 6158 return bpf_get_skb_set_tunnel_proto(func_id); 6159 case BPF_FUNC_skb_get_tunnel_opt: 6160 return &bpf_skb_get_tunnel_opt_proto; 6161 case BPF_FUNC_skb_set_tunnel_opt: 6162 return bpf_get_skb_set_tunnel_proto(func_id); 6163 case BPF_FUNC_redirect: 6164 return &bpf_redirect_proto; 6165 case BPF_FUNC_get_route_realm: 6166 return &bpf_get_route_realm_proto; 6167 case BPF_FUNC_get_hash_recalc: 6168 return &bpf_get_hash_recalc_proto; 6169 case BPF_FUNC_set_hash_invalid: 6170 return &bpf_set_hash_invalid_proto; 6171 case BPF_FUNC_set_hash: 6172 return &bpf_set_hash_proto; 6173 case BPF_FUNC_perf_event_output: 6174 return &bpf_skb_event_output_proto; 6175 case BPF_FUNC_get_smp_processor_id: 6176 return &bpf_get_smp_processor_id_proto; 6177 case BPF_FUNC_skb_under_cgroup: 6178 return &bpf_skb_under_cgroup_proto; 6179 case BPF_FUNC_get_socket_cookie: 6180 return &bpf_get_socket_cookie_proto; 6181 case BPF_FUNC_get_socket_uid: 6182 return &bpf_get_socket_uid_proto; 6183 case BPF_FUNC_fib_lookup: 6184 return &bpf_skb_fib_lookup_proto; 6185 case BPF_FUNC_sk_fullsock: 6186 return &bpf_sk_fullsock_proto; 6187 case BPF_FUNC_sk_storage_get: 6188 return &bpf_sk_storage_get_proto; 6189 case BPF_FUNC_sk_storage_delete: 6190 return &bpf_sk_storage_delete_proto; 6191 #ifdef CONFIG_XFRM 6192 case BPF_FUNC_skb_get_xfrm_state: 6193 return &bpf_skb_get_xfrm_state_proto; 6194 #endif 6195 #ifdef CONFIG_SOCK_CGROUP_DATA 6196 case BPF_FUNC_skb_cgroup_id: 6197 return &bpf_skb_cgroup_id_proto; 6198 case BPF_FUNC_skb_ancestor_cgroup_id: 6199 return &bpf_skb_ancestor_cgroup_id_proto; 6200 #endif 6201 #ifdef CONFIG_INET 6202 case BPF_FUNC_sk_lookup_tcp: 6203 return &bpf_sk_lookup_tcp_proto; 6204 case BPF_FUNC_sk_lookup_udp: 6205 return &bpf_sk_lookup_udp_proto; 6206 case BPF_FUNC_sk_release: 6207 return &bpf_sk_release_proto; 6208 case BPF_FUNC_tcp_sock: 6209 return &bpf_tcp_sock_proto; 6210 case BPF_FUNC_get_listener_sock: 6211 return &bpf_get_listener_sock_proto; 6212 case BPF_FUNC_skc_lookup_tcp: 6213 return &bpf_skc_lookup_tcp_proto; 6214 case BPF_FUNC_tcp_check_syncookie: 6215 return &bpf_tcp_check_syncookie_proto; 6216 case BPF_FUNC_skb_ecn_set_ce: 6217 return &bpf_skb_ecn_set_ce_proto; 6218 case BPF_FUNC_tcp_gen_syncookie: 6219 return &bpf_tcp_gen_syncookie_proto; 6220 #endif 6221 default: 6222 return bpf_base_func_proto(func_id); 6223 } 6224 } 6225 6226 static const struct bpf_func_proto * 6227 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6228 { 6229 switch (func_id) { 6230 case BPF_FUNC_perf_event_output: 6231 return &bpf_xdp_event_output_proto; 6232 case BPF_FUNC_get_smp_processor_id: 6233 return &bpf_get_smp_processor_id_proto; 6234 case BPF_FUNC_csum_diff: 6235 return &bpf_csum_diff_proto; 6236 case BPF_FUNC_xdp_adjust_head: 6237 return &bpf_xdp_adjust_head_proto; 6238 case BPF_FUNC_xdp_adjust_meta: 6239 return &bpf_xdp_adjust_meta_proto; 6240 case BPF_FUNC_redirect: 6241 return &bpf_xdp_redirect_proto; 6242 case BPF_FUNC_redirect_map: 6243 return &bpf_xdp_redirect_map_proto; 6244 case BPF_FUNC_xdp_adjust_tail: 6245 return &bpf_xdp_adjust_tail_proto; 6246 case BPF_FUNC_fib_lookup: 6247 return &bpf_xdp_fib_lookup_proto; 6248 #ifdef CONFIG_INET 6249 case BPF_FUNC_sk_lookup_udp: 6250 return &bpf_xdp_sk_lookup_udp_proto; 6251 case BPF_FUNC_sk_lookup_tcp: 6252 return &bpf_xdp_sk_lookup_tcp_proto; 6253 case BPF_FUNC_sk_release: 6254 return &bpf_sk_release_proto; 6255 case BPF_FUNC_skc_lookup_tcp: 6256 return &bpf_xdp_skc_lookup_tcp_proto; 6257 case BPF_FUNC_tcp_check_syncookie: 6258 return &bpf_tcp_check_syncookie_proto; 6259 case BPF_FUNC_tcp_gen_syncookie: 6260 return &bpf_tcp_gen_syncookie_proto; 6261 #endif 6262 default: 6263 return bpf_base_func_proto(func_id); 6264 } 6265 } 6266 6267 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 6268 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 6269 6270 static const struct bpf_func_proto * 6271 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6272 { 6273 switch (func_id) { 6274 case BPF_FUNC_setsockopt: 6275 return &bpf_setsockopt_proto; 6276 case BPF_FUNC_getsockopt: 6277 return &bpf_getsockopt_proto; 6278 case BPF_FUNC_sock_ops_cb_flags_set: 6279 return &bpf_sock_ops_cb_flags_set_proto; 6280 case BPF_FUNC_sock_map_update: 6281 return &bpf_sock_map_update_proto; 6282 case BPF_FUNC_sock_hash_update: 6283 return &bpf_sock_hash_update_proto; 6284 case BPF_FUNC_get_socket_cookie: 6285 return &bpf_get_socket_cookie_sock_ops_proto; 6286 case BPF_FUNC_get_local_storage: 6287 return &bpf_get_local_storage_proto; 6288 case BPF_FUNC_perf_event_output: 6289 return &bpf_sockopt_event_output_proto; 6290 case BPF_FUNC_sk_storage_get: 6291 return &bpf_sk_storage_get_proto; 6292 case BPF_FUNC_sk_storage_delete: 6293 return &bpf_sk_storage_delete_proto; 6294 #ifdef CONFIG_INET 6295 case BPF_FUNC_tcp_sock: 6296 return &bpf_tcp_sock_proto; 6297 #endif /* CONFIG_INET */ 6298 default: 6299 return bpf_base_func_proto(func_id); 6300 } 6301 } 6302 6303 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 6304 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 6305 6306 static const struct bpf_func_proto * 6307 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6308 { 6309 switch (func_id) { 6310 case BPF_FUNC_msg_redirect_map: 6311 return &bpf_msg_redirect_map_proto; 6312 case BPF_FUNC_msg_redirect_hash: 6313 return &bpf_msg_redirect_hash_proto; 6314 case BPF_FUNC_msg_apply_bytes: 6315 return &bpf_msg_apply_bytes_proto; 6316 case BPF_FUNC_msg_cork_bytes: 6317 return &bpf_msg_cork_bytes_proto; 6318 case BPF_FUNC_msg_pull_data: 6319 return &bpf_msg_pull_data_proto; 6320 case BPF_FUNC_msg_push_data: 6321 return &bpf_msg_push_data_proto; 6322 case BPF_FUNC_msg_pop_data: 6323 return &bpf_msg_pop_data_proto; 6324 default: 6325 return bpf_base_func_proto(func_id); 6326 } 6327 } 6328 6329 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 6330 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 6331 6332 static const struct bpf_func_proto * 6333 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6334 { 6335 switch (func_id) { 6336 case BPF_FUNC_skb_store_bytes: 6337 return &bpf_skb_store_bytes_proto; 6338 case BPF_FUNC_skb_load_bytes: 6339 return &bpf_skb_load_bytes_proto; 6340 case BPF_FUNC_skb_pull_data: 6341 return &sk_skb_pull_data_proto; 6342 case BPF_FUNC_skb_change_tail: 6343 return &sk_skb_change_tail_proto; 6344 case BPF_FUNC_skb_change_head: 6345 return &sk_skb_change_head_proto; 6346 case BPF_FUNC_get_socket_cookie: 6347 return &bpf_get_socket_cookie_proto; 6348 case BPF_FUNC_get_socket_uid: 6349 return &bpf_get_socket_uid_proto; 6350 case BPF_FUNC_sk_redirect_map: 6351 return &bpf_sk_redirect_map_proto; 6352 case BPF_FUNC_sk_redirect_hash: 6353 return &bpf_sk_redirect_hash_proto; 6354 case BPF_FUNC_perf_event_output: 6355 return &bpf_skb_event_output_proto; 6356 #ifdef CONFIG_INET 6357 case BPF_FUNC_sk_lookup_tcp: 6358 return &bpf_sk_lookup_tcp_proto; 6359 case BPF_FUNC_sk_lookup_udp: 6360 return &bpf_sk_lookup_udp_proto; 6361 case BPF_FUNC_sk_release: 6362 return &bpf_sk_release_proto; 6363 case BPF_FUNC_skc_lookup_tcp: 6364 return &bpf_skc_lookup_tcp_proto; 6365 #endif 6366 default: 6367 return bpf_base_func_proto(func_id); 6368 } 6369 } 6370 6371 static const struct bpf_func_proto * 6372 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6373 { 6374 switch (func_id) { 6375 case BPF_FUNC_skb_load_bytes: 6376 return &bpf_flow_dissector_load_bytes_proto; 6377 default: 6378 return bpf_base_func_proto(func_id); 6379 } 6380 } 6381 6382 static const struct bpf_func_proto * 6383 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6384 { 6385 switch (func_id) { 6386 case BPF_FUNC_skb_load_bytes: 6387 return &bpf_skb_load_bytes_proto; 6388 case BPF_FUNC_skb_pull_data: 6389 return &bpf_skb_pull_data_proto; 6390 case BPF_FUNC_csum_diff: 6391 return &bpf_csum_diff_proto; 6392 case BPF_FUNC_get_cgroup_classid: 6393 return &bpf_get_cgroup_classid_proto; 6394 case BPF_FUNC_get_route_realm: 6395 return &bpf_get_route_realm_proto; 6396 case BPF_FUNC_get_hash_recalc: 6397 return &bpf_get_hash_recalc_proto; 6398 case BPF_FUNC_perf_event_output: 6399 return &bpf_skb_event_output_proto; 6400 case BPF_FUNC_get_smp_processor_id: 6401 return &bpf_get_smp_processor_id_proto; 6402 case BPF_FUNC_skb_under_cgroup: 6403 return &bpf_skb_under_cgroup_proto; 6404 default: 6405 return bpf_base_func_proto(func_id); 6406 } 6407 } 6408 6409 static const struct bpf_func_proto * 6410 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6411 { 6412 switch (func_id) { 6413 case BPF_FUNC_lwt_push_encap: 6414 return &bpf_lwt_in_push_encap_proto; 6415 default: 6416 return lwt_out_func_proto(func_id, prog); 6417 } 6418 } 6419 6420 static const struct bpf_func_proto * 6421 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6422 { 6423 switch (func_id) { 6424 case BPF_FUNC_skb_get_tunnel_key: 6425 return &bpf_skb_get_tunnel_key_proto; 6426 case BPF_FUNC_skb_set_tunnel_key: 6427 return bpf_get_skb_set_tunnel_proto(func_id); 6428 case BPF_FUNC_skb_get_tunnel_opt: 6429 return &bpf_skb_get_tunnel_opt_proto; 6430 case BPF_FUNC_skb_set_tunnel_opt: 6431 return bpf_get_skb_set_tunnel_proto(func_id); 6432 case BPF_FUNC_redirect: 6433 return &bpf_redirect_proto; 6434 case BPF_FUNC_clone_redirect: 6435 return &bpf_clone_redirect_proto; 6436 case BPF_FUNC_skb_change_tail: 6437 return &bpf_skb_change_tail_proto; 6438 case BPF_FUNC_skb_change_head: 6439 return &bpf_skb_change_head_proto; 6440 case BPF_FUNC_skb_store_bytes: 6441 return &bpf_skb_store_bytes_proto; 6442 case BPF_FUNC_csum_update: 6443 return &bpf_csum_update_proto; 6444 case BPF_FUNC_l3_csum_replace: 6445 return &bpf_l3_csum_replace_proto; 6446 case BPF_FUNC_l4_csum_replace: 6447 return &bpf_l4_csum_replace_proto; 6448 case BPF_FUNC_set_hash_invalid: 6449 return &bpf_set_hash_invalid_proto; 6450 case BPF_FUNC_lwt_push_encap: 6451 return &bpf_lwt_xmit_push_encap_proto; 6452 default: 6453 return lwt_out_func_proto(func_id, prog); 6454 } 6455 } 6456 6457 static const struct bpf_func_proto * 6458 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6459 { 6460 switch (func_id) { 6461 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6462 case BPF_FUNC_lwt_seg6_store_bytes: 6463 return &bpf_lwt_seg6_store_bytes_proto; 6464 case BPF_FUNC_lwt_seg6_action: 6465 return &bpf_lwt_seg6_action_proto; 6466 case BPF_FUNC_lwt_seg6_adjust_srh: 6467 return &bpf_lwt_seg6_adjust_srh_proto; 6468 #endif 6469 default: 6470 return lwt_out_func_proto(func_id, prog); 6471 } 6472 } 6473 6474 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 6475 const struct bpf_prog *prog, 6476 struct bpf_insn_access_aux *info) 6477 { 6478 const int size_default = sizeof(__u32); 6479 6480 if (off < 0 || off >= sizeof(struct __sk_buff)) 6481 return false; 6482 6483 /* The verifier guarantees that size > 0. */ 6484 if (off % size != 0) 6485 return false; 6486 6487 switch (off) { 6488 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6489 if (off + size > offsetofend(struct __sk_buff, cb[4])) 6490 return false; 6491 break; 6492 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 6493 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 6494 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 6495 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 6496 case bpf_ctx_range(struct __sk_buff, data): 6497 case bpf_ctx_range(struct __sk_buff, data_meta): 6498 case bpf_ctx_range(struct __sk_buff, data_end): 6499 if (size != size_default) 6500 return false; 6501 break; 6502 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 6503 return false; 6504 case bpf_ctx_range(struct __sk_buff, tstamp): 6505 if (size != sizeof(__u64)) 6506 return false; 6507 break; 6508 case offsetof(struct __sk_buff, sk): 6509 if (type == BPF_WRITE || size != sizeof(__u64)) 6510 return false; 6511 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 6512 break; 6513 default: 6514 /* Only narrow read access allowed for now. */ 6515 if (type == BPF_WRITE) { 6516 if (size != size_default) 6517 return false; 6518 } else { 6519 bpf_ctx_record_field_size(info, size_default); 6520 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6521 return false; 6522 } 6523 } 6524 6525 return true; 6526 } 6527 6528 static bool sk_filter_is_valid_access(int off, int size, 6529 enum bpf_access_type type, 6530 const struct bpf_prog *prog, 6531 struct bpf_insn_access_aux *info) 6532 { 6533 switch (off) { 6534 case bpf_ctx_range(struct __sk_buff, tc_classid): 6535 case bpf_ctx_range(struct __sk_buff, data): 6536 case bpf_ctx_range(struct __sk_buff, data_meta): 6537 case bpf_ctx_range(struct __sk_buff, data_end): 6538 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6539 case bpf_ctx_range(struct __sk_buff, tstamp): 6540 case bpf_ctx_range(struct __sk_buff, wire_len): 6541 return false; 6542 } 6543 6544 if (type == BPF_WRITE) { 6545 switch (off) { 6546 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6547 break; 6548 default: 6549 return false; 6550 } 6551 } 6552 6553 return bpf_skb_is_valid_access(off, size, type, prog, info); 6554 } 6555 6556 static bool cg_skb_is_valid_access(int off, int size, 6557 enum bpf_access_type type, 6558 const struct bpf_prog *prog, 6559 struct bpf_insn_access_aux *info) 6560 { 6561 switch (off) { 6562 case bpf_ctx_range(struct __sk_buff, tc_classid): 6563 case bpf_ctx_range(struct __sk_buff, data_meta): 6564 case bpf_ctx_range(struct __sk_buff, wire_len): 6565 return false; 6566 case bpf_ctx_range(struct __sk_buff, data): 6567 case bpf_ctx_range(struct __sk_buff, data_end): 6568 if (!capable(CAP_SYS_ADMIN)) 6569 return false; 6570 break; 6571 } 6572 6573 if (type == BPF_WRITE) { 6574 switch (off) { 6575 case bpf_ctx_range(struct __sk_buff, mark): 6576 case bpf_ctx_range(struct __sk_buff, priority): 6577 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6578 break; 6579 case bpf_ctx_range(struct __sk_buff, tstamp): 6580 if (!capable(CAP_SYS_ADMIN)) 6581 return false; 6582 break; 6583 default: 6584 return false; 6585 } 6586 } 6587 6588 switch (off) { 6589 case bpf_ctx_range(struct __sk_buff, data): 6590 info->reg_type = PTR_TO_PACKET; 6591 break; 6592 case bpf_ctx_range(struct __sk_buff, data_end): 6593 info->reg_type = PTR_TO_PACKET_END; 6594 break; 6595 } 6596 6597 return bpf_skb_is_valid_access(off, size, type, prog, info); 6598 } 6599 6600 static bool lwt_is_valid_access(int off, int size, 6601 enum bpf_access_type type, 6602 const struct bpf_prog *prog, 6603 struct bpf_insn_access_aux *info) 6604 { 6605 switch (off) { 6606 case bpf_ctx_range(struct __sk_buff, tc_classid): 6607 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6608 case bpf_ctx_range(struct __sk_buff, data_meta): 6609 case bpf_ctx_range(struct __sk_buff, tstamp): 6610 case bpf_ctx_range(struct __sk_buff, wire_len): 6611 return false; 6612 } 6613 6614 if (type == BPF_WRITE) { 6615 switch (off) { 6616 case bpf_ctx_range(struct __sk_buff, mark): 6617 case bpf_ctx_range(struct __sk_buff, priority): 6618 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6619 break; 6620 default: 6621 return false; 6622 } 6623 } 6624 6625 switch (off) { 6626 case bpf_ctx_range(struct __sk_buff, data): 6627 info->reg_type = PTR_TO_PACKET; 6628 break; 6629 case bpf_ctx_range(struct __sk_buff, data_end): 6630 info->reg_type = PTR_TO_PACKET_END; 6631 break; 6632 } 6633 6634 return bpf_skb_is_valid_access(off, size, type, prog, info); 6635 } 6636 6637 /* Attach type specific accesses */ 6638 static bool __sock_filter_check_attach_type(int off, 6639 enum bpf_access_type access_type, 6640 enum bpf_attach_type attach_type) 6641 { 6642 switch (off) { 6643 case offsetof(struct bpf_sock, bound_dev_if): 6644 case offsetof(struct bpf_sock, mark): 6645 case offsetof(struct bpf_sock, priority): 6646 switch (attach_type) { 6647 case BPF_CGROUP_INET_SOCK_CREATE: 6648 goto full_access; 6649 default: 6650 return false; 6651 } 6652 case bpf_ctx_range(struct bpf_sock, src_ip4): 6653 switch (attach_type) { 6654 case BPF_CGROUP_INET4_POST_BIND: 6655 goto read_only; 6656 default: 6657 return false; 6658 } 6659 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6660 switch (attach_type) { 6661 case BPF_CGROUP_INET6_POST_BIND: 6662 goto read_only; 6663 default: 6664 return false; 6665 } 6666 case bpf_ctx_range(struct bpf_sock, src_port): 6667 switch (attach_type) { 6668 case BPF_CGROUP_INET4_POST_BIND: 6669 case BPF_CGROUP_INET6_POST_BIND: 6670 goto read_only; 6671 default: 6672 return false; 6673 } 6674 } 6675 read_only: 6676 return access_type == BPF_READ; 6677 full_access: 6678 return true; 6679 } 6680 6681 bool bpf_sock_common_is_valid_access(int off, int size, 6682 enum bpf_access_type type, 6683 struct bpf_insn_access_aux *info) 6684 { 6685 switch (off) { 6686 case bpf_ctx_range_till(struct bpf_sock, type, priority): 6687 return false; 6688 default: 6689 return bpf_sock_is_valid_access(off, size, type, info); 6690 } 6691 } 6692 6693 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6694 struct bpf_insn_access_aux *info) 6695 { 6696 const int size_default = sizeof(__u32); 6697 6698 if (off < 0 || off >= sizeof(struct bpf_sock)) 6699 return false; 6700 if (off % size != 0) 6701 return false; 6702 6703 switch (off) { 6704 case offsetof(struct bpf_sock, state): 6705 case offsetof(struct bpf_sock, family): 6706 case offsetof(struct bpf_sock, type): 6707 case offsetof(struct bpf_sock, protocol): 6708 case offsetof(struct bpf_sock, dst_port): 6709 case offsetof(struct bpf_sock, src_port): 6710 case bpf_ctx_range(struct bpf_sock, src_ip4): 6711 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6712 case bpf_ctx_range(struct bpf_sock, dst_ip4): 6713 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 6714 bpf_ctx_record_field_size(info, size_default); 6715 return bpf_ctx_narrow_access_ok(off, size, size_default); 6716 } 6717 6718 return size == size_default; 6719 } 6720 6721 static bool sock_filter_is_valid_access(int off, int size, 6722 enum bpf_access_type type, 6723 const struct bpf_prog *prog, 6724 struct bpf_insn_access_aux *info) 6725 { 6726 if (!bpf_sock_is_valid_access(off, size, type, info)) 6727 return false; 6728 return __sock_filter_check_attach_type(off, type, 6729 prog->expected_attach_type); 6730 } 6731 6732 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 6733 const struct bpf_prog *prog) 6734 { 6735 /* Neither direct read nor direct write requires any preliminary 6736 * action. 6737 */ 6738 return 0; 6739 } 6740 6741 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 6742 const struct bpf_prog *prog, int drop_verdict) 6743 { 6744 struct bpf_insn *insn = insn_buf; 6745 6746 if (!direct_write) 6747 return 0; 6748 6749 /* if (!skb->cloned) 6750 * goto start; 6751 * 6752 * (Fast-path, otherwise approximation that we might be 6753 * a clone, do the rest in helper.) 6754 */ 6755 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); 6756 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 6757 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 6758 6759 /* ret = bpf_skb_pull_data(skb, 0); */ 6760 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 6761 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 6762 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 6763 BPF_FUNC_skb_pull_data); 6764 /* if (!ret) 6765 * goto restore; 6766 * return TC_ACT_SHOT; 6767 */ 6768 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 6769 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 6770 *insn++ = BPF_EXIT_INSN(); 6771 6772 /* restore: */ 6773 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 6774 /* start: */ 6775 *insn++ = prog->insnsi[0]; 6776 6777 return insn - insn_buf; 6778 } 6779 6780 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 6781 struct bpf_insn *insn_buf) 6782 { 6783 bool indirect = BPF_MODE(orig->code) == BPF_IND; 6784 struct bpf_insn *insn = insn_buf; 6785 6786 /* We're guaranteed here that CTX is in R6. */ 6787 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 6788 if (!indirect) { 6789 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 6790 } else { 6791 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 6792 if (orig->imm) 6793 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 6794 } 6795 6796 switch (BPF_SIZE(orig->code)) { 6797 case BPF_B: 6798 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 6799 break; 6800 case BPF_H: 6801 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 6802 break; 6803 case BPF_W: 6804 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 6805 break; 6806 } 6807 6808 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 6809 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 6810 *insn++ = BPF_EXIT_INSN(); 6811 6812 return insn - insn_buf; 6813 } 6814 6815 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 6816 const struct bpf_prog *prog) 6817 { 6818 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 6819 } 6820 6821 static bool tc_cls_act_is_valid_access(int off, int size, 6822 enum bpf_access_type type, 6823 const struct bpf_prog *prog, 6824 struct bpf_insn_access_aux *info) 6825 { 6826 if (type == BPF_WRITE) { 6827 switch (off) { 6828 case bpf_ctx_range(struct __sk_buff, mark): 6829 case bpf_ctx_range(struct __sk_buff, tc_index): 6830 case bpf_ctx_range(struct __sk_buff, priority): 6831 case bpf_ctx_range(struct __sk_buff, tc_classid): 6832 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6833 case bpf_ctx_range(struct __sk_buff, tstamp): 6834 case bpf_ctx_range(struct __sk_buff, queue_mapping): 6835 break; 6836 default: 6837 return false; 6838 } 6839 } 6840 6841 switch (off) { 6842 case bpf_ctx_range(struct __sk_buff, data): 6843 info->reg_type = PTR_TO_PACKET; 6844 break; 6845 case bpf_ctx_range(struct __sk_buff, data_meta): 6846 info->reg_type = PTR_TO_PACKET_META; 6847 break; 6848 case bpf_ctx_range(struct __sk_buff, data_end): 6849 info->reg_type = PTR_TO_PACKET_END; 6850 break; 6851 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6852 return false; 6853 } 6854 6855 return bpf_skb_is_valid_access(off, size, type, prog, info); 6856 } 6857 6858 static bool __is_valid_xdp_access(int off, int size) 6859 { 6860 if (off < 0 || off >= sizeof(struct xdp_md)) 6861 return false; 6862 if (off % size != 0) 6863 return false; 6864 if (size != sizeof(__u32)) 6865 return false; 6866 6867 return true; 6868 } 6869 6870 static bool xdp_is_valid_access(int off, int size, 6871 enum bpf_access_type type, 6872 const struct bpf_prog *prog, 6873 struct bpf_insn_access_aux *info) 6874 { 6875 if (type == BPF_WRITE) { 6876 if (bpf_prog_is_dev_bound(prog->aux)) { 6877 switch (off) { 6878 case offsetof(struct xdp_md, rx_queue_index): 6879 return __is_valid_xdp_access(off, size); 6880 } 6881 } 6882 return false; 6883 } 6884 6885 switch (off) { 6886 case offsetof(struct xdp_md, data): 6887 info->reg_type = PTR_TO_PACKET; 6888 break; 6889 case offsetof(struct xdp_md, data_meta): 6890 info->reg_type = PTR_TO_PACKET_META; 6891 break; 6892 case offsetof(struct xdp_md, data_end): 6893 info->reg_type = PTR_TO_PACKET_END; 6894 break; 6895 } 6896 6897 return __is_valid_xdp_access(off, size); 6898 } 6899 6900 void bpf_warn_invalid_xdp_action(u32 act) 6901 { 6902 const u32 act_max = XDP_REDIRECT; 6903 6904 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", 6905 act > act_max ? "Illegal" : "Driver unsupported", 6906 act); 6907 } 6908 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 6909 6910 static bool sock_addr_is_valid_access(int off, int size, 6911 enum bpf_access_type type, 6912 const struct bpf_prog *prog, 6913 struct bpf_insn_access_aux *info) 6914 { 6915 const int size_default = sizeof(__u32); 6916 6917 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 6918 return false; 6919 if (off % size != 0) 6920 return false; 6921 6922 /* Disallow access to IPv6 fields from IPv4 contex and vise 6923 * versa. 6924 */ 6925 switch (off) { 6926 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6927 switch (prog->expected_attach_type) { 6928 case BPF_CGROUP_INET4_BIND: 6929 case BPF_CGROUP_INET4_CONNECT: 6930 case BPF_CGROUP_UDP4_SENDMSG: 6931 case BPF_CGROUP_UDP4_RECVMSG: 6932 break; 6933 default: 6934 return false; 6935 } 6936 break; 6937 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6938 switch (prog->expected_attach_type) { 6939 case BPF_CGROUP_INET6_BIND: 6940 case BPF_CGROUP_INET6_CONNECT: 6941 case BPF_CGROUP_UDP6_SENDMSG: 6942 case BPF_CGROUP_UDP6_RECVMSG: 6943 break; 6944 default: 6945 return false; 6946 } 6947 break; 6948 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6949 switch (prog->expected_attach_type) { 6950 case BPF_CGROUP_UDP4_SENDMSG: 6951 break; 6952 default: 6953 return false; 6954 } 6955 break; 6956 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6957 msg_src_ip6[3]): 6958 switch (prog->expected_attach_type) { 6959 case BPF_CGROUP_UDP6_SENDMSG: 6960 break; 6961 default: 6962 return false; 6963 } 6964 break; 6965 } 6966 6967 switch (off) { 6968 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6969 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6970 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6971 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6972 msg_src_ip6[3]): 6973 if (type == BPF_READ) { 6974 bpf_ctx_record_field_size(info, size_default); 6975 6976 if (bpf_ctx_wide_access_ok(off, size, 6977 struct bpf_sock_addr, 6978 user_ip6)) 6979 return true; 6980 6981 if (bpf_ctx_wide_access_ok(off, size, 6982 struct bpf_sock_addr, 6983 msg_src_ip6)) 6984 return true; 6985 6986 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6987 return false; 6988 } else { 6989 if (bpf_ctx_wide_access_ok(off, size, 6990 struct bpf_sock_addr, 6991 user_ip6)) 6992 return true; 6993 6994 if (bpf_ctx_wide_access_ok(off, size, 6995 struct bpf_sock_addr, 6996 msg_src_ip6)) 6997 return true; 6998 6999 if (size != size_default) 7000 return false; 7001 } 7002 break; 7003 case bpf_ctx_range(struct bpf_sock_addr, user_port): 7004 if (size != size_default) 7005 return false; 7006 break; 7007 case offsetof(struct bpf_sock_addr, sk): 7008 if (type != BPF_READ) 7009 return false; 7010 if (size != sizeof(__u64)) 7011 return false; 7012 info->reg_type = PTR_TO_SOCKET; 7013 break; 7014 default: 7015 if (type == BPF_READ) { 7016 if (size != size_default) 7017 return false; 7018 } else { 7019 return false; 7020 } 7021 } 7022 7023 return true; 7024 } 7025 7026 static bool sock_ops_is_valid_access(int off, int size, 7027 enum bpf_access_type type, 7028 const struct bpf_prog *prog, 7029 struct bpf_insn_access_aux *info) 7030 { 7031 const int size_default = sizeof(__u32); 7032 7033 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 7034 return false; 7035 7036 /* The verifier guarantees that size > 0. */ 7037 if (off % size != 0) 7038 return false; 7039 7040 if (type == BPF_WRITE) { 7041 switch (off) { 7042 case offsetof(struct bpf_sock_ops, reply): 7043 case offsetof(struct bpf_sock_ops, sk_txhash): 7044 if (size != size_default) 7045 return false; 7046 break; 7047 default: 7048 return false; 7049 } 7050 } else { 7051 switch (off) { 7052 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 7053 bytes_acked): 7054 if (size != sizeof(__u64)) 7055 return false; 7056 break; 7057 case offsetof(struct bpf_sock_ops, sk): 7058 if (size != sizeof(__u64)) 7059 return false; 7060 info->reg_type = PTR_TO_SOCKET_OR_NULL; 7061 break; 7062 default: 7063 if (size != size_default) 7064 return false; 7065 break; 7066 } 7067 } 7068 7069 return true; 7070 } 7071 7072 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 7073 const struct bpf_prog *prog) 7074 { 7075 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 7076 } 7077 7078 static bool sk_skb_is_valid_access(int off, int size, 7079 enum bpf_access_type type, 7080 const struct bpf_prog *prog, 7081 struct bpf_insn_access_aux *info) 7082 { 7083 switch (off) { 7084 case bpf_ctx_range(struct __sk_buff, tc_classid): 7085 case bpf_ctx_range(struct __sk_buff, data_meta): 7086 case bpf_ctx_range(struct __sk_buff, tstamp): 7087 case bpf_ctx_range(struct __sk_buff, wire_len): 7088 return false; 7089 } 7090 7091 if (type == BPF_WRITE) { 7092 switch (off) { 7093 case bpf_ctx_range(struct __sk_buff, tc_index): 7094 case bpf_ctx_range(struct __sk_buff, priority): 7095 break; 7096 default: 7097 return false; 7098 } 7099 } 7100 7101 switch (off) { 7102 case bpf_ctx_range(struct __sk_buff, mark): 7103 return false; 7104 case bpf_ctx_range(struct __sk_buff, data): 7105 info->reg_type = PTR_TO_PACKET; 7106 break; 7107 case bpf_ctx_range(struct __sk_buff, data_end): 7108 info->reg_type = PTR_TO_PACKET_END; 7109 break; 7110 } 7111 7112 return bpf_skb_is_valid_access(off, size, type, prog, info); 7113 } 7114 7115 static bool sk_msg_is_valid_access(int off, int size, 7116 enum bpf_access_type type, 7117 const struct bpf_prog *prog, 7118 struct bpf_insn_access_aux *info) 7119 { 7120 if (type == BPF_WRITE) 7121 return false; 7122 7123 if (off % size != 0) 7124 return false; 7125 7126 switch (off) { 7127 case offsetof(struct sk_msg_md, data): 7128 info->reg_type = PTR_TO_PACKET; 7129 if (size != sizeof(__u64)) 7130 return false; 7131 break; 7132 case offsetof(struct sk_msg_md, data_end): 7133 info->reg_type = PTR_TO_PACKET_END; 7134 if (size != sizeof(__u64)) 7135 return false; 7136 break; 7137 case bpf_ctx_range(struct sk_msg_md, family): 7138 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 7139 case bpf_ctx_range(struct sk_msg_md, local_ip4): 7140 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 7141 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 7142 case bpf_ctx_range(struct sk_msg_md, remote_port): 7143 case bpf_ctx_range(struct sk_msg_md, local_port): 7144 case bpf_ctx_range(struct sk_msg_md, size): 7145 if (size != sizeof(__u32)) 7146 return false; 7147 break; 7148 default: 7149 return false; 7150 } 7151 return true; 7152 } 7153 7154 static bool flow_dissector_is_valid_access(int off, int size, 7155 enum bpf_access_type type, 7156 const struct bpf_prog *prog, 7157 struct bpf_insn_access_aux *info) 7158 { 7159 const int size_default = sizeof(__u32); 7160 7161 if (off < 0 || off >= sizeof(struct __sk_buff)) 7162 return false; 7163 7164 if (type == BPF_WRITE) 7165 return false; 7166 7167 switch (off) { 7168 case bpf_ctx_range(struct __sk_buff, data): 7169 if (size != size_default) 7170 return false; 7171 info->reg_type = PTR_TO_PACKET; 7172 return true; 7173 case bpf_ctx_range(struct __sk_buff, data_end): 7174 if (size != size_default) 7175 return false; 7176 info->reg_type = PTR_TO_PACKET_END; 7177 return true; 7178 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 7179 if (size != sizeof(__u64)) 7180 return false; 7181 info->reg_type = PTR_TO_FLOW_KEYS; 7182 return true; 7183 default: 7184 return false; 7185 } 7186 } 7187 7188 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 7189 const struct bpf_insn *si, 7190 struct bpf_insn *insn_buf, 7191 struct bpf_prog *prog, 7192 u32 *target_size) 7193 7194 { 7195 struct bpf_insn *insn = insn_buf; 7196 7197 switch (si->off) { 7198 case offsetof(struct __sk_buff, data): 7199 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 7200 si->dst_reg, si->src_reg, 7201 offsetof(struct bpf_flow_dissector, data)); 7202 break; 7203 7204 case offsetof(struct __sk_buff, data_end): 7205 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 7206 si->dst_reg, si->src_reg, 7207 offsetof(struct bpf_flow_dissector, data_end)); 7208 break; 7209 7210 case offsetof(struct __sk_buff, flow_keys): 7211 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 7212 si->dst_reg, si->src_reg, 7213 offsetof(struct bpf_flow_dissector, flow_keys)); 7214 break; 7215 } 7216 7217 return insn - insn_buf; 7218 } 7219 7220 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 7221 const struct bpf_insn *si, 7222 struct bpf_insn *insn_buf, 7223 struct bpf_prog *prog, u32 *target_size) 7224 { 7225 struct bpf_insn *insn = insn_buf; 7226 int off; 7227 7228 switch (si->off) { 7229 case offsetof(struct __sk_buff, len): 7230 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7231 bpf_target_off(struct sk_buff, len, 4, 7232 target_size)); 7233 break; 7234 7235 case offsetof(struct __sk_buff, protocol): 7236 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7237 bpf_target_off(struct sk_buff, protocol, 2, 7238 target_size)); 7239 break; 7240 7241 case offsetof(struct __sk_buff, vlan_proto): 7242 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7243 bpf_target_off(struct sk_buff, vlan_proto, 2, 7244 target_size)); 7245 break; 7246 7247 case offsetof(struct __sk_buff, priority): 7248 if (type == BPF_WRITE) 7249 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7250 bpf_target_off(struct sk_buff, priority, 4, 7251 target_size)); 7252 else 7253 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7254 bpf_target_off(struct sk_buff, priority, 4, 7255 target_size)); 7256 break; 7257 7258 case offsetof(struct __sk_buff, ingress_ifindex): 7259 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7260 bpf_target_off(struct sk_buff, skb_iif, 4, 7261 target_size)); 7262 break; 7263 7264 case offsetof(struct __sk_buff, ifindex): 7265 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7266 si->dst_reg, si->src_reg, 7267 offsetof(struct sk_buff, dev)); 7268 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 7269 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7270 bpf_target_off(struct net_device, ifindex, 4, 7271 target_size)); 7272 break; 7273 7274 case offsetof(struct __sk_buff, hash): 7275 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7276 bpf_target_off(struct sk_buff, hash, 4, 7277 target_size)); 7278 break; 7279 7280 case offsetof(struct __sk_buff, mark): 7281 if (type == BPF_WRITE) 7282 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7283 bpf_target_off(struct sk_buff, mark, 4, 7284 target_size)); 7285 else 7286 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7287 bpf_target_off(struct sk_buff, mark, 4, 7288 target_size)); 7289 break; 7290 7291 case offsetof(struct __sk_buff, pkt_type): 7292 *target_size = 1; 7293 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7294 PKT_TYPE_OFFSET()); 7295 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 7296 #ifdef __BIG_ENDIAN_BITFIELD 7297 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 7298 #endif 7299 break; 7300 7301 case offsetof(struct __sk_buff, queue_mapping): 7302 if (type == BPF_WRITE) { 7303 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 7304 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7305 bpf_target_off(struct sk_buff, 7306 queue_mapping, 7307 2, target_size)); 7308 } else { 7309 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7310 bpf_target_off(struct sk_buff, 7311 queue_mapping, 7312 2, target_size)); 7313 } 7314 break; 7315 7316 case offsetof(struct __sk_buff, vlan_present): 7317 *target_size = 1; 7318 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7319 PKT_VLAN_PRESENT_OFFSET()); 7320 if (PKT_VLAN_PRESENT_BIT) 7321 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); 7322 if (PKT_VLAN_PRESENT_BIT < 7) 7323 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); 7324 break; 7325 7326 case offsetof(struct __sk_buff, vlan_tci): 7327 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7328 bpf_target_off(struct sk_buff, vlan_tci, 2, 7329 target_size)); 7330 break; 7331 7332 case offsetof(struct __sk_buff, cb[0]) ... 7333 offsetofend(struct __sk_buff, cb[4]) - 1: 7334 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); 7335 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 7336 offsetof(struct qdisc_skb_cb, data)) % 7337 sizeof(__u64)); 7338 7339 prog->cb_access = 1; 7340 off = si->off; 7341 off -= offsetof(struct __sk_buff, cb[0]); 7342 off += offsetof(struct sk_buff, cb); 7343 off += offsetof(struct qdisc_skb_cb, data); 7344 if (type == BPF_WRITE) 7345 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, 7346 si->src_reg, off); 7347 else 7348 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 7349 si->src_reg, off); 7350 break; 7351 7352 case offsetof(struct __sk_buff, tc_classid): 7353 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); 7354 7355 off = si->off; 7356 off -= offsetof(struct __sk_buff, tc_classid); 7357 off += offsetof(struct sk_buff, cb); 7358 off += offsetof(struct qdisc_skb_cb, tc_classid); 7359 *target_size = 2; 7360 if (type == BPF_WRITE) 7361 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, 7362 si->src_reg, off); 7363 else 7364 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 7365 si->src_reg, off); 7366 break; 7367 7368 case offsetof(struct __sk_buff, data): 7369 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 7370 si->dst_reg, si->src_reg, 7371 offsetof(struct sk_buff, data)); 7372 break; 7373 7374 case offsetof(struct __sk_buff, data_meta): 7375 off = si->off; 7376 off -= offsetof(struct __sk_buff, data_meta); 7377 off += offsetof(struct sk_buff, cb); 7378 off += offsetof(struct bpf_skb_data_end, data_meta); 7379 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7380 si->src_reg, off); 7381 break; 7382 7383 case offsetof(struct __sk_buff, data_end): 7384 off = si->off; 7385 off -= offsetof(struct __sk_buff, data_end); 7386 off += offsetof(struct sk_buff, cb); 7387 off += offsetof(struct bpf_skb_data_end, data_end); 7388 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7389 si->src_reg, off); 7390 break; 7391 7392 case offsetof(struct __sk_buff, tc_index): 7393 #ifdef CONFIG_NET_SCHED 7394 if (type == BPF_WRITE) 7395 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7396 bpf_target_off(struct sk_buff, tc_index, 2, 7397 target_size)); 7398 else 7399 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7400 bpf_target_off(struct sk_buff, tc_index, 2, 7401 target_size)); 7402 #else 7403 *target_size = 2; 7404 if (type == BPF_WRITE) 7405 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 7406 else 7407 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7408 #endif 7409 break; 7410 7411 case offsetof(struct __sk_buff, napi_id): 7412 #if defined(CONFIG_NET_RX_BUSY_POLL) 7413 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7414 bpf_target_off(struct sk_buff, napi_id, 4, 7415 target_size)); 7416 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 7417 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7418 #else 7419 *target_size = 4; 7420 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7421 #endif 7422 break; 7423 case offsetof(struct __sk_buff, family): 7424 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 7425 7426 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7427 si->dst_reg, si->src_reg, 7428 offsetof(struct sk_buff, sk)); 7429 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7430 bpf_target_off(struct sock_common, 7431 skc_family, 7432 2, target_size)); 7433 break; 7434 case offsetof(struct __sk_buff, remote_ip4): 7435 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 7436 7437 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7438 si->dst_reg, si->src_reg, 7439 offsetof(struct sk_buff, sk)); 7440 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7441 bpf_target_off(struct sock_common, 7442 skc_daddr, 7443 4, target_size)); 7444 break; 7445 case offsetof(struct __sk_buff, local_ip4): 7446 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7447 skc_rcv_saddr) != 4); 7448 7449 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7450 si->dst_reg, si->src_reg, 7451 offsetof(struct sk_buff, sk)); 7452 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7453 bpf_target_off(struct sock_common, 7454 skc_rcv_saddr, 7455 4, target_size)); 7456 break; 7457 case offsetof(struct __sk_buff, remote_ip6[0]) ... 7458 offsetof(struct __sk_buff, remote_ip6[3]): 7459 #if IS_ENABLED(CONFIG_IPV6) 7460 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7461 skc_v6_daddr.s6_addr32[0]) != 4); 7462 7463 off = si->off; 7464 off -= offsetof(struct __sk_buff, remote_ip6[0]); 7465 7466 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7467 si->dst_reg, si->src_reg, 7468 offsetof(struct sk_buff, sk)); 7469 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7470 offsetof(struct sock_common, 7471 skc_v6_daddr.s6_addr32[0]) + 7472 off); 7473 #else 7474 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7475 #endif 7476 break; 7477 case offsetof(struct __sk_buff, local_ip6[0]) ... 7478 offsetof(struct __sk_buff, local_ip6[3]): 7479 #if IS_ENABLED(CONFIG_IPV6) 7480 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7481 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 7482 7483 off = si->off; 7484 off -= offsetof(struct __sk_buff, local_ip6[0]); 7485 7486 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7487 si->dst_reg, si->src_reg, 7488 offsetof(struct sk_buff, sk)); 7489 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7490 offsetof(struct sock_common, 7491 skc_v6_rcv_saddr.s6_addr32[0]) + 7492 off); 7493 #else 7494 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7495 #endif 7496 break; 7497 7498 case offsetof(struct __sk_buff, remote_port): 7499 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 7500 7501 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7502 si->dst_reg, si->src_reg, 7503 offsetof(struct sk_buff, sk)); 7504 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7505 bpf_target_off(struct sock_common, 7506 skc_dport, 7507 2, target_size)); 7508 #ifndef __BIG_ENDIAN_BITFIELD 7509 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 7510 #endif 7511 break; 7512 7513 case offsetof(struct __sk_buff, local_port): 7514 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 7515 7516 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7517 si->dst_reg, si->src_reg, 7518 offsetof(struct sk_buff, sk)); 7519 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7520 bpf_target_off(struct sock_common, 7521 skc_num, 2, target_size)); 7522 break; 7523 7524 case offsetof(struct __sk_buff, tstamp): 7525 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, tstamp) != 8); 7526 7527 if (type == BPF_WRITE) 7528 *insn++ = BPF_STX_MEM(BPF_DW, 7529 si->dst_reg, si->src_reg, 7530 bpf_target_off(struct sk_buff, 7531 tstamp, 8, 7532 target_size)); 7533 else 7534 *insn++ = BPF_LDX_MEM(BPF_DW, 7535 si->dst_reg, si->src_reg, 7536 bpf_target_off(struct sk_buff, 7537 tstamp, 8, 7538 target_size)); 7539 break; 7540 7541 case offsetof(struct __sk_buff, gso_segs): 7542 /* si->dst_reg = skb_shinfo(SKB); */ 7543 #ifdef NET_SKBUFF_DATA_USES_OFFSET 7544 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7545 BPF_REG_AX, si->src_reg, 7546 offsetof(struct sk_buff, end)); 7547 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 7548 si->dst_reg, si->src_reg, 7549 offsetof(struct sk_buff, head)); 7550 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); 7551 #else 7552 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7553 si->dst_reg, si->src_reg, 7554 offsetof(struct sk_buff, end)); 7555 #endif 7556 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 7557 si->dst_reg, si->dst_reg, 7558 bpf_target_off(struct skb_shared_info, 7559 gso_segs, 2, 7560 target_size)); 7561 break; 7562 case offsetof(struct __sk_buff, wire_len): 7563 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, pkt_len) != 4); 7564 7565 off = si->off; 7566 off -= offsetof(struct __sk_buff, wire_len); 7567 off += offsetof(struct sk_buff, cb); 7568 off += offsetof(struct qdisc_skb_cb, pkt_len); 7569 *target_size = 4; 7570 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 7571 break; 7572 7573 case offsetof(struct __sk_buff, sk): 7574 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7575 si->dst_reg, si->src_reg, 7576 offsetof(struct sk_buff, sk)); 7577 break; 7578 } 7579 7580 return insn - insn_buf; 7581 } 7582 7583 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 7584 const struct bpf_insn *si, 7585 struct bpf_insn *insn_buf, 7586 struct bpf_prog *prog, u32 *target_size) 7587 { 7588 struct bpf_insn *insn = insn_buf; 7589 int off; 7590 7591 switch (si->off) { 7592 case offsetof(struct bpf_sock, bound_dev_if): 7593 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); 7594 7595 if (type == BPF_WRITE) 7596 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7597 offsetof(struct sock, sk_bound_dev_if)); 7598 else 7599 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7600 offsetof(struct sock, sk_bound_dev_if)); 7601 break; 7602 7603 case offsetof(struct bpf_sock, mark): 7604 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4); 7605 7606 if (type == BPF_WRITE) 7607 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7608 offsetof(struct sock, sk_mark)); 7609 else 7610 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7611 offsetof(struct sock, sk_mark)); 7612 break; 7613 7614 case offsetof(struct bpf_sock, priority): 7615 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4); 7616 7617 if (type == BPF_WRITE) 7618 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7619 offsetof(struct sock, sk_priority)); 7620 else 7621 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7622 offsetof(struct sock, sk_priority)); 7623 break; 7624 7625 case offsetof(struct bpf_sock, family): 7626 *insn++ = BPF_LDX_MEM( 7627 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 7628 si->dst_reg, si->src_reg, 7629 bpf_target_off(struct sock_common, 7630 skc_family, 7631 FIELD_SIZEOF(struct sock_common, 7632 skc_family), 7633 target_size)); 7634 break; 7635 7636 case offsetof(struct bpf_sock, type): 7637 BUILD_BUG_ON(HWEIGHT32(SK_FL_TYPE_MASK) != BITS_PER_BYTE * 2); 7638 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7639 offsetof(struct sock, __sk_flags_offset)); 7640 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); 7641 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); 7642 *target_size = 2; 7643 break; 7644 7645 case offsetof(struct bpf_sock, protocol): 7646 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE); 7647 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7648 offsetof(struct sock, __sk_flags_offset)); 7649 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 7650 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); 7651 *target_size = 1; 7652 break; 7653 7654 case offsetof(struct bpf_sock, src_ip4): 7655 *insn++ = BPF_LDX_MEM( 7656 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7657 bpf_target_off(struct sock_common, skc_rcv_saddr, 7658 FIELD_SIZEOF(struct sock_common, 7659 skc_rcv_saddr), 7660 target_size)); 7661 break; 7662 7663 case offsetof(struct bpf_sock, dst_ip4): 7664 *insn++ = BPF_LDX_MEM( 7665 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7666 bpf_target_off(struct sock_common, skc_daddr, 7667 FIELD_SIZEOF(struct sock_common, 7668 skc_daddr), 7669 target_size)); 7670 break; 7671 7672 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 7673 #if IS_ENABLED(CONFIG_IPV6) 7674 off = si->off; 7675 off -= offsetof(struct bpf_sock, src_ip6[0]); 7676 *insn++ = BPF_LDX_MEM( 7677 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7678 bpf_target_off( 7679 struct sock_common, 7680 skc_v6_rcv_saddr.s6_addr32[0], 7681 FIELD_SIZEOF(struct sock_common, 7682 skc_v6_rcv_saddr.s6_addr32[0]), 7683 target_size) + off); 7684 #else 7685 (void)off; 7686 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7687 #endif 7688 break; 7689 7690 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 7691 #if IS_ENABLED(CONFIG_IPV6) 7692 off = si->off; 7693 off -= offsetof(struct bpf_sock, dst_ip6[0]); 7694 *insn++ = BPF_LDX_MEM( 7695 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7696 bpf_target_off(struct sock_common, 7697 skc_v6_daddr.s6_addr32[0], 7698 FIELD_SIZEOF(struct sock_common, 7699 skc_v6_daddr.s6_addr32[0]), 7700 target_size) + off); 7701 #else 7702 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7703 *target_size = 4; 7704 #endif 7705 break; 7706 7707 case offsetof(struct bpf_sock, src_port): 7708 *insn++ = BPF_LDX_MEM( 7709 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 7710 si->dst_reg, si->src_reg, 7711 bpf_target_off(struct sock_common, skc_num, 7712 FIELD_SIZEOF(struct sock_common, 7713 skc_num), 7714 target_size)); 7715 break; 7716 7717 case offsetof(struct bpf_sock, dst_port): 7718 *insn++ = BPF_LDX_MEM( 7719 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 7720 si->dst_reg, si->src_reg, 7721 bpf_target_off(struct sock_common, skc_dport, 7722 FIELD_SIZEOF(struct sock_common, 7723 skc_dport), 7724 target_size)); 7725 break; 7726 7727 case offsetof(struct bpf_sock, state): 7728 *insn++ = BPF_LDX_MEM( 7729 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 7730 si->dst_reg, si->src_reg, 7731 bpf_target_off(struct sock_common, skc_state, 7732 FIELD_SIZEOF(struct sock_common, 7733 skc_state), 7734 target_size)); 7735 break; 7736 } 7737 7738 return insn - insn_buf; 7739 } 7740 7741 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 7742 const struct bpf_insn *si, 7743 struct bpf_insn *insn_buf, 7744 struct bpf_prog *prog, u32 *target_size) 7745 { 7746 struct bpf_insn *insn = insn_buf; 7747 7748 switch (si->off) { 7749 case offsetof(struct __sk_buff, ifindex): 7750 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7751 si->dst_reg, si->src_reg, 7752 offsetof(struct sk_buff, dev)); 7753 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7754 bpf_target_off(struct net_device, ifindex, 4, 7755 target_size)); 7756 break; 7757 default: 7758 return bpf_convert_ctx_access(type, si, insn_buf, prog, 7759 target_size); 7760 } 7761 7762 return insn - insn_buf; 7763 } 7764 7765 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 7766 const struct bpf_insn *si, 7767 struct bpf_insn *insn_buf, 7768 struct bpf_prog *prog, u32 *target_size) 7769 { 7770 struct bpf_insn *insn = insn_buf; 7771 7772 switch (si->off) { 7773 case offsetof(struct xdp_md, data): 7774 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 7775 si->dst_reg, si->src_reg, 7776 offsetof(struct xdp_buff, data)); 7777 break; 7778 case offsetof(struct xdp_md, data_meta): 7779 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 7780 si->dst_reg, si->src_reg, 7781 offsetof(struct xdp_buff, data_meta)); 7782 break; 7783 case offsetof(struct xdp_md, data_end): 7784 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 7785 si->dst_reg, si->src_reg, 7786 offsetof(struct xdp_buff, data_end)); 7787 break; 7788 case offsetof(struct xdp_md, ingress_ifindex): 7789 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7790 si->dst_reg, si->src_reg, 7791 offsetof(struct xdp_buff, rxq)); 7792 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 7793 si->dst_reg, si->dst_reg, 7794 offsetof(struct xdp_rxq_info, dev)); 7795 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7796 offsetof(struct net_device, ifindex)); 7797 break; 7798 case offsetof(struct xdp_md, rx_queue_index): 7799 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7800 si->dst_reg, si->src_reg, 7801 offsetof(struct xdp_buff, rxq)); 7802 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7803 offsetof(struct xdp_rxq_info, 7804 queue_index)); 7805 break; 7806 } 7807 7808 return insn - insn_buf; 7809 } 7810 7811 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 7812 * context Structure, F is Field in context structure that contains a pointer 7813 * to Nested Structure of type NS that has the field NF. 7814 * 7815 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 7816 * sure that SIZE is not greater than actual size of S.F.NF. 7817 * 7818 * If offset OFF is provided, the load happens from that offset relative to 7819 * offset of NF. 7820 */ 7821 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 7822 do { \ 7823 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 7824 si->src_reg, offsetof(S, F)); \ 7825 *insn++ = BPF_LDX_MEM( \ 7826 SIZE, si->dst_reg, si->dst_reg, \ 7827 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ 7828 target_size) \ 7829 + OFF); \ 7830 } while (0) 7831 7832 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 7833 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 7834 BPF_FIELD_SIZEOF(NS, NF), 0) 7835 7836 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 7837 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 7838 * 7839 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 7840 * "register" since two registers available in convert_ctx_access are not 7841 * enough: we can't override neither SRC, since it contains value to store, nor 7842 * DST since it contains pointer to context that may be used by later 7843 * instructions. But we need a temporary place to save pointer to nested 7844 * structure whose field we want to store to. 7845 */ 7846 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 7847 do { \ 7848 int tmp_reg = BPF_REG_9; \ 7849 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7850 --tmp_reg; \ 7851 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7852 --tmp_reg; \ 7853 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 7854 offsetof(S, TF)); \ 7855 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 7856 si->dst_reg, offsetof(S, F)); \ 7857 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ 7858 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ 7859 target_size) \ 7860 + OFF); \ 7861 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 7862 offsetof(S, TF)); \ 7863 } while (0) 7864 7865 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 7866 TF) \ 7867 do { \ 7868 if (type == BPF_WRITE) { \ 7869 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 7870 OFF, TF); \ 7871 } else { \ 7872 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 7873 S, NS, F, NF, SIZE, OFF); \ 7874 } \ 7875 } while (0) 7876 7877 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 7878 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 7879 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 7880 7881 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 7882 const struct bpf_insn *si, 7883 struct bpf_insn *insn_buf, 7884 struct bpf_prog *prog, u32 *target_size) 7885 { 7886 struct bpf_insn *insn = insn_buf; 7887 int off; 7888 7889 switch (si->off) { 7890 case offsetof(struct bpf_sock_addr, user_family): 7891 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7892 struct sockaddr, uaddr, sa_family); 7893 break; 7894 7895 case offsetof(struct bpf_sock_addr, user_ip4): 7896 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7897 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 7898 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 7899 break; 7900 7901 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 7902 off = si->off; 7903 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 7904 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7905 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 7906 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 7907 tmp_reg); 7908 break; 7909 7910 case offsetof(struct bpf_sock_addr, user_port): 7911 /* To get port we need to know sa_family first and then treat 7912 * sockaddr as either sockaddr_in or sockaddr_in6. 7913 * Though we can simplify since port field has same offset and 7914 * size in both structures. 7915 * Here we check this invariant and use just one of the 7916 * structures if it's true. 7917 */ 7918 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 7919 offsetof(struct sockaddr_in6, sin6_port)); 7920 BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) != 7921 FIELD_SIZEOF(struct sockaddr_in6, sin6_port)); 7922 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, 7923 struct sockaddr_in6, uaddr, 7924 sin6_port, tmp_reg); 7925 break; 7926 7927 case offsetof(struct bpf_sock_addr, family): 7928 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7929 struct sock, sk, sk_family); 7930 break; 7931 7932 case offsetof(struct bpf_sock_addr, type): 7933 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( 7934 struct bpf_sock_addr_kern, struct sock, sk, 7935 __sk_flags_offset, BPF_W, 0); 7936 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); 7937 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); 7938 break; 7939 7940 case offsetof(struct bpf_sock_addr, protocol): 7941 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( 7942 struct bpf_sock_addr_kern, struct sock, sk, 7943 __sk_flags_offset, BPF_W, 0); 7944 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 7945 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 7946 SK_FL_PROTO_SHIFT); 7947 break; 7948 7949 case offsetof(struct bpf_sock_addr, msg_src_ip4): 7950 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 7951 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7952 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 7953 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 7954 break; 7955 7956 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 7957 msg_src_ip6[3]): 7958 off = si->off; 7959 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 7960 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 7961 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7962 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 7963 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 7964 break; 7965 case offsetof(struct bpf_sock_addr, sk): 7966 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 7967 si->dst_reg, si->src_reg, 7968 offsetof(struct bpf_sock_addr_kern, sk)); 7969 break; 7970 } 7971 7972 return insn - insn_buf; 7973 } 7974 7975 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 7976 const struct bpf_insn *si, 7977 struct bpf_insn *insn_buf, 7978 struct bpf_prog *prog, 7979 u32 *target_size) 7980 { 7981 struct bpf_insn *insn = insn_buf; 7982 int off; 7983 7984 /* Helper macro for adding read access to tcp_sock or sock fields. */ 7985 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 7986 do { \ 7987 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ 7988 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ 7989 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7990 struct bpf_sock_ops_kern, \ 7991 is_fullsock), \ 7992 si->dst_reg, si->src_reg, \ 7993 offsetof(struct bpf_sock_ops_kern, \ 7994 is_fullsock)); \ 7995 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ 7996 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7997 struct bpf_sock_ops_kern, sk),\ 7998 si->dst_reg, si->src_reg, \ 7999 offsetof(struct bpf_sock_ops_kern, sk));\ 8000 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 8001 OBJ_FIELD), \ 8002 si->dst_reg, si->dst_reg, \ 8003 offsetof(OBJ, OBJ_FIELD)); \ 8004 } while (0) 8005 8006 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 8007 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 8008 8009 /* Helper macro for adding write access to tcp_sock or sock fields. 8010 * The macro is called with two registers, dst_reg which contains a pointer 8011 * to ctx (context) and src_reg which contains the value that should be 8012 * stored. However, we need an additional register since we cannot overwrite 8013 * dst_reg because it may be used later in the program. 8014 * Instead we "borrow" one of the other register. We first save its value 8015 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 8016 * it at the end of the macro. 8017 */ 8018 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 8019 do { \ 8020 int reg = BPF_REG_9; \ 8021 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ 8022 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ 8023 if (si->dst_reg == reg || si->src_reg == reg) \ 8024 reg--; \ 8025 if (si->dst_reg == reg || si->src_reg == reg) \ 8026 reg--; \ 8027 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 8028 offsetof(struct bpf_sock_ops_kern, \ 8029 temp)); \ 8030 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 8031 struct bpf_sock_ops_kern, \ 8032 is_fullsock), \ 8033 reg, si->dst_reg, \ 8034 offsetof(struct bpf_sock_ops_kern, \ 8035 is_fullsock)); \ 8036 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 8037 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 8038 struct bpf_sock_ops_kern, sk),\ 8039 reg, si->dst_reg, \ 8040 offsetof(struct bpf_sock_ops_kern, sk));\ 8041 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ 8042 reg, si->src_reg, \ 8043 offsetof(OBJ, OBJ_FIELD)); \ 8044 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 8045 offsetof(struct bpf_sock_ops_kern, \ 8046 temp)); \ 8047 } while (0) 8048 8049 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 8050 do { \ 8051 if (TYPE == BPF_WRITE) \ 8052 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 8053 else \ 8054 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 8055 } while (0) 8056 8057 if (insn > insn_buf) 8058 return insn - insn_buf; 8059 8060 switch (si->off) { 8061 case offsetof(struct bpf_sock_ops, op) ... 8062 offsetof(struct bpf_sock_ops, replylong[3]): 8063 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != 8064 FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); 8065 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != 8066 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); 8067 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != 8068 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); 8069 off = si->off; 8070 off -= offsetof(struct bpf_sock_ops, op); 8071 off += offsetof(struct bpf_sock_ops_kern, op); 8072 if (type == BPF_WRITE) 8073 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8074 off); 8075 else 8076 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8077 off); 8078 break; 8079 8080 case offsetof(struct bpf_sock_ops, family): 8081 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 8082 8083 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8084 struct bpf_sock_ops_kern, sk), 8085 si->dst_reg, si->src_reg, 8086 offsetof(struct bpf_sock_ops_kern, sk)); 8087 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8088 offsetof(struct sock_common, skc_family)); 8089 break; 8090 8091 case offsetof(struct bpf_sock_ops, remote_ip4): 8092 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 8093 8094 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8095 struct bpf_sock_ops_kern, sk), 8096 si->dst_reg, si->src_reg, 8097 offsetof(struct bpf_sock_ops_kern, sk)); 8098 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8099 offsetof(struct sock_common, skc_daddr)); 8100 break; 8101 8102 case offsetof(struct bpf_sock_ops, local_ip4): 8103 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8104 skc_rcv_saddr) != 4); 8105 8106 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8107 struct bpf_sock_ops_kern, sk), 8108 si->dst_reg, si->src_reg, 8109 offsetof(struct bpf_sock_ops_kern, sk)); 8110 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8111 offsetof(struct sock_common, 8112 skc_rcv_saddr)); 8113 break; 8114 8115 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 8116 offsetof(struct bpf_sock_ops, remote_ip6[3]): 8117 #if IS_ENABLED(CONFIG_IPV6) 8118 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8119 skc_v6_daddr.s6_addr32[0]) != 4); 8120 8121 off = si->off; 8122 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 8123 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8124 struct bpf_sock_ops_kern, sk), 8125 si->dst_reg, si->src_reg, 8126 offsetof(struct bpf_sock_ops_kern, sk)); 8127 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8128 offsetof(struct sock_common, 8129 skc_v6_daddr.s6_addr32[0]) + 8130 off); 8131 #else 8132 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8133 #endif 8134 break; 8135 8136 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 8137 offsetof(struct bpf_sock_ops, local_ip6[3]): 8138 #if IS_ENABLED(CONFIG_IPV6) 8139 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8140 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8141 8142 off = si->off; 8143 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 8144 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8145 struct bpf_sock_ops_kern, sk), 8146 si->dst_reg, si->src_reg, 8147 offsetof(struct bpf_sock_ops_kern, sk)); 8148 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8149 offsetof(struct sock_common, 8150 skc_v6_rcv_saddr.s6_addr32[0]) + 8151 off); 8152 #else 8153 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8154 #endif 8155 break; 8156 8157 case offsetof(struct bpf_sock_ops, remote_port): 8158 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 8159 8160 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8161 struct bpf_sock_ops_kern, sk), 8162 si->dst_reg, si->src_reg, 8163 offsetof(struct bpf_sock_ops_kern, sk)); 8164 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8165 offsetof(struct sock_common, skc_dport)); 8166 #ifndef __BIG_ENDIAN_BITFIELD 8167 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8168 #endif 8169 break; 8170 8171 case offsetof(struct bpf_sock_ops, local_port): 8172 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 8173 8174 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8175 struct bpf_sock_ops_kern, sk), 8176 si->dst_reg, si->src_reg, 8177 offsetof(struct bpf_sock_ops_kern, sk)); 8178 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8179 offsetof(struct sock_common, skc_num)); 8180 break; 8181 8182 case offsetof(struct bpf_sock_ops, is_fullsock): 8183 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8184 struct bpf_sock_ops_kern, 8185 is_fullsock), 8186 si->dst_reg, si->src_reg, 8187 offsetof(struct bpf_sock_ops_kern, 8188 is_fullsock)); 8189 break; 8190 8191 case offsetof(struct bpf_sock_ops, state): 8192 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1); 8193 8194 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8195 struct bpf_sock_ops_kern, sk), 8196 si->dst_reg, si->src_reg, 8197 offsetof(struct bpf_sock_ops_kern, sk)); 8198 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 8199 offsetof(struct sock_common, skc_state)); 8200 break; 8201 8202 case offsetof(struct bpf_sock_ops, rtt_min): 8203 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != 8204 sizeof(struct minmax)); 8205 BUILD_BUG_ON(sizeof(struct minmax) < 8206 sizeof(struct minmax_sample)); 8207 8208 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8209 struct bpf_sock_ops_kern, sk), 8210 si->dst_reg, si->src_reg, 8211 offsetof(struct bpf_sock_ops_kern, sk)); 8212 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8213 offsetof(struct tcp_sock, rtt_min) + 8214 FIELD_SIZEOF(struct minmax_sample, t)); 8215 break; 8216 8217 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 8218 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 8219 struct tcp_sock); 8220 break; 8221 8222 case offsetof(struct bpf_sock_ops, sk_txhash): 8223 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 8224 struct sock, type); 8225 break; 8226 case offsetof(struct bpf_sock_ops, snd_cwnd): 8227 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 8228 break; 8229 case offsetof(struct bpf_sock_ops, srtt_us): 8230 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 8231 break; 8232 case offsetof(struct bpf_sock_ops, snd_ssthresh): 8233 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 8234 break; 8235 case offsetof(struct bpf_sock_ops, rcv_nxt): 8236 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 8237 break; 8238 case offsetof(struct bpf_sock_ops, snd_nxt): 8239 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 8240 break; 8241 case offsetof(struct bpf_sock_ops, snd_una): 8242 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 8243 break; 8244 case offsetof(struct bpf_sock_ops, mss_cache): 8245 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 8246 break; 8247 case offsetof(struct bpf_sock_ops, ecn_flags): 8248 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 8249 break; 8250 case offsetof(struct bpf_sock_ops, rate_delivered): 8251 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 8252 break; 8253 case offsetof(struct bpf_sock_ops, rate_interval_us): 8254 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 8255 break; 8256 case offsetof(struct bpf_sock_ops, packets_out): 8257 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 8258 break; 8259 case offsetof(struct bpf_sock_ops, retrans_out): 8260 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 8261 break; 8262 case offsetof(struct bpf_sock_ops, total_retrans): 8263 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 8264 break; 8265 case offsetof(struct bpf_sock_ops, segs_in): 8266 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 8267 break; 8268 case offsetof(struct bpf_sock_ops, data_segs_in): 8269 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 8270 break; 8271 case offsetof(struct bpf_sock_ops, segs_out): 8272 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 8273 break; 8274 case offsetof(struct bpf_sock_ops, data_segs_out): 8275 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 8276 break; 8277 case offsetof(struct bpf_sock_ops, lost_out): 8278 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 8279 break; 8280 case offsetof(struct bpf_sock_ops, sacked_out): 8281 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 8282 break; 8283 case offsetof(struct bpf_sock_ops, bytes_received): 8284 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 8285 break; 8286 case offsetof(struct bpf_sock_ops, bytes_acked): 8287 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 8288 break; 8289 case offsetof(struct bpf_sock_ops, sk): 8290 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8291 struct bpf_sock_ops_kern, 8292 is_fullsock), 8293 si->dst_reg, si->src_reg, 8294 offsetof(struct bpf_sock_ops_kern, 8295 is_fullsock)); 8296 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 8297 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8298 struct bpf_sock_ops_kern, sk), 8299 si->dst_reg, si->src_reg, 8300 offsetof(struct bpf_sock_ops_kern, sk)); 8301 break; 8302 } 8303 return insn - insn_buf; 8304 } 8305 8306 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 8307 const struct bpf_insn *si, 8308 struct bpf_insn *insn_buf, 8309 struct bpf_prog *prog, u32 *target_size) 8310 { 8311 struct bpf_insn *insn = insn_buf; 8312 int off; 8313 8314 switch (si->off) { 8315 case offsetof(struct __sk_buff, data_end): 8316 off = si->off; 8317 off -= offsetof(struct __sk_buff, data_end); 8318 off += offsetof(struct sk_buff, cb); 8319 off += offsetof(struct tcp_skb_cb, bpf.data_end); 8320 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 8321 si->src_reg, off); 8322 break; 8323 default: 8324 return bpf_convert_ctx_access(type, si, insn_buf, prog, 8325 target_size); 8326 } 8327 8328 return insn - insn_buf; 8329 } 8330 8331 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 8332 const struct bpf_insn *si, 8333 struct bpf_insn *insn_buf, 8334 struct bpf_prog *prog, u32 *target_size) 8335 { 8336 struct bpf_insn *insn = insn_buf; 8337 #if IS_ENABLED(CONFIG_IPV6) 8338 int off; 8339 #endif 8340 8341 /* convert ctx uses the fact sg element is first in struct */ 8342 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 8343 8344 switch (si->off) { 8345 case offsetof(struct sk_msg_md, data): 8346 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 8347 si->dst_reg, si->src_reg, 8348 offsetof(struct sk_msg, data)); 8349 break; 8350 case offsetof(struct sk_msg_md, data_end): 8351 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 8352 si->dst_reg, si->src_reg, 8353 offsetof(struct sk_msg, data_end)); 8354 break; 8355 case offsetof(struct sk_msg_md, family): 8356 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 8357 8358 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8359 struct sk_msg, sk), 8360 si->dst_reg, si->src_reg, 8361 offsetof(struct sk_msg, sk)); 8362 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8363 offsetof(struct sock_common, skc_family)); 8364 break; 8365 8366 case offsetof(struct sk_msg_md, remote_ip4): 8367 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 8368 8369 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8370 struct sk_msg, sk), 8371 si->dst_reg, si->src_reg, 8372 offsetof(struct sk_msg, sk)); 8373 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8374 offsetof(struct sock_common, skc_daddr)); 8375 break; 8376 8377 case offsetof(struct sk_msg_md, local_ip4): 8378 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8379 skc_rcv_saddr) != 4); 8380 8381 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8382 struct sk_msg, sk), 8383 si->dst_reg, si->src_reg, 8384 offsetof(struct sk_msg, sk)); 8385 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8386 offsetof(struct sock_common, 8387 skc_rcv_saddr)); 8388 break; 8389 8390 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 8391 offsetof(struct sk_msg_md, remote_ip6[3]): 8392 #if IS_ENABLED(CONFIG_IPV6) 8393 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8394 skc_v6_daddr.s6_addr32[0]) != 4); 8395 8396 off = si->off; 8397 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 8398 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8399 struct sk_msg, sk), 8400 si->dst_reg, si->src_reg, 8401 offsetof(struct sk_msg, sk)); 8402 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8403 offsetof(struct sock_common, 8404 skc_v6_daddr.s6_addr32[0]) + 8405 off); 8406 #else 8407 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8408 #endif 8409 break; 8410 8411 case offsetof(struct sk_msg_md, local_ip6[0]) ... 8412 offsetof(struct sk_msg_md, local_ip6[3]): 8413 #if IS_ENABLED(CONFIG_IPV6) 8414 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8415 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8416 8417 off = si->off; 8418 off -= offsetof(struct sk_msg_md, local_ip6[0]); 8419 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8420 struct sk_msg, sk), 8421 si->dst_reg, si->src_reg, 8422 offsetof(struct sk_msg, sk)); 8423 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8424 offsetof(struct sock_common, 8425 skc_v6_rcv_saddr.s6_addr32[0]) + 8426 off); 8427 #else 8428 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8429 #endif 8430 break; 8431 8432 case offsetof(struct sk_msg_md, remote_port): 8433 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 8434 8435 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8436 struct sk_msg, sk), 8437 si->dst_reg, si->src_reg, 8438 offsetof(struct sk_msg, sk)); 8439 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8440 offsetof(struct sock_common, skc_dport)); 8441 #ifndef __BIG_ENDIAN_BITFIELD 8442 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8443 #endif 8444 break; 8445 8446 case offsetof(struct sk_msg_md, local_port): 8447 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 8448 8449 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8450 struct sk_msg, sk), 8451 si->dst_reg, si->src_reg, 8452 offsetof(struct sk_msg, sk)); 8453 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8454 offsetof(struct sock_common, skc_num)); 8455 break; 8456 8457 case offsetof(struct sk_msg_md, size): 8458 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 8459 si->dst_reg, si->src_reg, 8460 offsetof(struct sk_msg_sg, size)); 8461 break; 8462 } 8463 8464 return insn - insn_buf; 8465 } 8466 8467 const struct bpf_verifier_ops sk_filter_verifier_ops = { 8468 .get_func_proto = sk_filter_func_proto, 8469 .is_valid_access = sk_filter_is_valid_access, 8470 .convert_ctx_access = bpf_convert_ctx_access, 8471 .gen_ld_abs = bpf_gen_ld_abs, 8472 }; 8473 8474 const struct bpf_prog_ops sk_filter_prog_ops = { 8475 .test_run = bpf_prog_test_run_skb, 8476 }; 8477 8478 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 8479 .get_func_proto = tc_cls_act_func_proto, 8480 .is_valid_access = tc_cls_act_is_valid_access, 8481 .convert_ctx_access = tc_cls_act_convert_ctx_access, 8482 .gen_prologue = tc_cls_act_prologue, 8483 .gen_ld_abs = bpf_gen_ld_abs, 8484 }; 8485 8486 const struct bpf_prog_ops tc_cls_act_prog_ops = { 8487 .test_run = bpf_prog_test_run_skb, 8488 }; 8489 8490 const struct bpf_verifier_ops xdp_verifier_ops = { 8491 .get_func_proto = xdp_func_proto, 8492 .is_valid_access = xdp_is_valid_access, 8493 .convert_ctx_access = xdp_convert_ctx_access, 8494 .gen_prologue = bpf_noop_prologue, 8495 }; 8496 8497 const struct bpf_prog_ops xdp_prog_ops = { 8498 .test_run = bpf_prog_test_run_xdp, 8499 }; 8500 8501 const struct bpf_verifier_ops cg_skb_verifier_ops = { 8502 .get_func_proto = cg_skb_func_proto, 8503 .is_valid_access = cg_skb_is_valid_access, 8504 .convert_ctx_access = bpf_convert_ctx_access, 8505 }; 8506 8507 const struct bpf_prog_ops cg_skb_prog_ops = { 8508 .test_run = bpf_prog_test_run_skb, 8509 }; 8510 8511 const struct bpf_verifier_ops lwt_in_verifier_ops = { 8512 .get_func_proto = lwt_in_func_proto, 8513 .is_valid_access = lwt_is_valid_access, 8514 .convert_ctx_access = bpf_convert_ctx_access, 8515 }; 8516 8517 const struct bpf_prog_ops lwt_in_prog_ops = { 8518 .test_run = bpf_prog_test_run_skb, 8519 }; 8520 8521 const struct bpf_verifier_ops lwt_out_verifier_ops = { 8522 .get_func_proto = lwt_out_func_proto, 8523 .is_valid_access = lwt_is_valid_access, 8524 .convert_ctx_access = bpf_convert_ctx_access, 8525 }; 8526 8527 const struct bpf_prog_ops lwt_out_prog_ops = { 8528 .test_run = bpf_prog_test_run_skb, 8529 }; 8530 8531 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 8532 .get_func_proto = lwt_xmit_func_proto, 8533 .is_valid_access = lwt_is_valid_access, 8534 .convert_ctx_access = bpf_convert_ctx_access, 8535 .gen_prologue = tc_cls_act_prologue, 8536 }; 8537 8538 const struct bpf_prog_ops lwt_xmit_prog_ops = { 8539 .test_run = bpf_prog_test_run_skb, 8540 }; 8541 8542 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 8543 .get_func_proto = lwt_seg6local_func_proto, 8544 .is_valid_access = lwt_is_valid_access, 8545 .convert_ctx_access = bpf_convert_ctx_access, 8546 }; 8547 8548 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 8549 .test_run = bpf_prog_test_run_skb, 8550 }; 8551 8552 const struct bpf_verifier_ops cg_sock_verifier_ops = { 8553 .get_func_proto = sock_filter_func_proto, 8554 .is_valid_access = sock_filter_is_valid_access, 8555 .convert_ctx_access = bpf_sock_convert_ctx_access, 8556 }; 8557 8558 const struct bpf_prog_ops cg_sock_prog_ops = { 8559 }; 8560 8561 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 8562 .get_func_proto = sock_addr_func_proto, 8563 .is_valid_access = sock_addr_is_valid_access, 8564 .convert_ctx_access = sock_addr_convert_ctx_access, 8565 }; 8566 8567 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 8568 }; 8569 8570 const struct bpf_verifier_ops sock_ops_verifier_ops = { 8571 .get_func_proto = sock_ops_func_proto, 8572 .is_valid_access = sock_ops_is_valid_access, 8573 .convert_ctx_access = sock_ops_convert_ctx_access, 8574 }; 8575 8576 const struct bpf_prog_ops sock_ops_prog_ops = { 8577 }; 8578 8579 const struct bpf_verifier_ops sk_skb_verifier_ops = { 8580 .get_func_proto = sk_skb_func_proto, 8581 .is_valid_access = sk_skb_is_valid_access, 8582 .convert_ctx_access = sk_skb_convert_ctx_access, 8583 .gen_prologue = sk_skb_prologue, 8584 }; 8585 8586 const struct bpf_prog_ops sk_skb_prog_ops = { 8587 }; 8588 8589 const struct bpf_verifier_ops sk_msg_verifier_ops = { 8590 .get_func_proto = sk_msg_func_proto, 8591 .is_valid_access = sk_msg_is_valid_access, 8592 .convert_ctx_access = sk_msg_convert_ctx_access, 8593 .gen_prologue = bpf_noop_prologue, 8594 }; 8595 8596 const struct bpf_prog_ops sk_msg_prog_ops = { 8597 }; 8598 8599 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 8600 .get_func_proto = flow_dissector_func_proto, 8601 .is_valid_access = flow_dissector_is_valid_access, 8602 .convert_ctx_access = flow_dissector_convert_ctx_access, 8603 }; 8604 8605 const struct bpf_prog_ops flow_dissector_prog_ops = { 8606 .test_run = bpf_prog_test_run_flow_dissector, 8607 }; 8608 8609 int sk_detach_filter(struct sock *sk) 8610 { 8611 int ret = -ENOENT; 8612 struct sk_filter *filter; 8613 8614 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 8615 return -EPERM; 8616 8617 filter = rcu_dereference_protected(sk->sk_filter, 8618 lockdep_sock_is_held(sk)); 8619 if (filter) { 8620 RCU_INIT_POINTER(sk->sk_filter, NULL); 8621 sk_filter_uncharge(sk, filter); 8622 ret = 0; 8623 } 8624 8625 return ret; 8626 } 8627 EXPORT_SYMBOL_GPL(sk_detach_filter); 8628 8629 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, 8630 unsigned int len) 8631 { 8632 struct sock_fprog_kern *fprog; 8633 struct sk_filter *filter; 8634 int ret = 0; 8635 8636 lock_sock(sk); 8637 filter = rcu_dereference_protected(sk->sk_filter, 8638 lockdep_sock_is_held(sk)); 8639 if (!filter) 8640 goto out; 8641 8642 /* We're copying the filter that has been originally attached, 8643 * so no conversion/decode needed anymore. eBPF programs that 8644 * have no original program cannot be dumped through this. 8645 */ 8646 ret = -EACCES; 8647 fprog = filter->prog->orig_prog; 8648 if (!fprog) 8649 goto out; 8650 8651 ret = fprog->len; 8652 if (!len) 8653 /* User space only enquires number of filter blocks. */ 8654 goto out; 8655 8656 ret = -EINVAL; 8657 if (len < fprog->len) 8658 goto out; 8659 8660 ret = -EFAULT; 8661 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) 8662 goto out; 8663 8664 /* Instead of bytes, the API requests to return the number 8665 * of filter blocks. 8666 */ 8667 ret = fprog->len; 8668 out: 8669 release_sock(sk); 8670 return ret; 8671 } 8672 8673 #ifdef CONFIG_INET 8674 struct sk_reuseport_kern { 8675 struct sk_buff *skb; 8676 struct sock *sk; 8677 struct sock *selected_sk; 8678 void *data_end; 8679 u32 hash; 8680 u32 reuseport_id; 8681 bool bind_inany; 8682 }; 8683 8684 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 8685 struct sock_reuseport *reuse, 8686 struct sock *sk, struct sk_buff *skb, 8687 u32 hash) 8688 { 8689 reuse_kern->skb = skb; 8690 reuse_kern->sk = sk; 8691 reuse_kern->selected_sk = NULL; 8692 reuse_kern->data_end = skb->data + skb_headlen(skb); 8693 reuse_kern->hash = hash; 8694 reuse_kern->reuseport_id = reuse->reuseport_id; 8695 reuse_kern->bind_inany = reuse->bind_inany; 8696 } 8697 8698 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 8699 struct bpf_prog *prog, struct sk_buff *skb, 8700 u32 hash) 8701 { 8702 struct sk_reuseport_kern reuse_kern; 8703 enum sk_action action; 8704 8705 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); 8706 action = BPF_PROG_RUN(prog, &reuse_kern); 8707 8708 if (action == SK_PASS) 8709 return reuse_kern.selected_sk; 8710 else 8711 return ERR_PTR(-ECONNREFUSED); 8712 } 8713 8714 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 8715 struct bpf_map *, map, void *, key, u32, flags) 8716 { 8717 struct sock_reuseport *reuse; 8718 struct sock *selected_sk; 8719 8720 selected_sk = map->ops->map_lookup_elem(map, key); 8721 if (!selected_sk) 8722 return -ENOENT; 8723 8724 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 8725 if (!reuse) 8726 /* selected_sk is unhashed (e.g. by close()) after the 8727 * above map_lookup_elem(). Treat selected_sk has already 8728 * been removed from the map. 8729 */ 8730 return -ENOENT; 8731 8732 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 8733 struct sock *sk; 8734 8735 if (unlikely(!reuse_kern->reuseport_id)) 8736 /* There is a small race between adding the 8737 * sk to the map and setting the 8738 * reuse_kern->reuseport_id. 8739 * Treat it as the sk has not been added to 8740 * the bpf map yet. 8741 */ 8742 return -ENOENT; 8743 8744 sk = reuse_kern->sk; 8745 if (sk->sk_protocol != selected_sk->sk_protocol) 8746 return -EPROTOTYPE; 8747 else if (sk->sk_family != selected_sk->sk_family) 8748 return -EAFNOSUPPORT; 8749 8750 /* Catch all. Likely bound to a different sockaddr. */ 8751 return -EBADFD; 8752 } 8753 8754 reuse_kern->selected_sk = selected_sk; 8755 8756 return 0; 8757 } 8758 8759 static const struct bpf_func_proto sk_select_reuseport_proto = { 8760 .func = sk_select_reuseport, 8761 .gpl_only = false, 8762 .ret_type = RET_INTEGER, 8763 .arg1_type = ARG_PTR_TO_CTX, 8764 .arg2_type = ARG_CONST_MAP_PTR, 8765 .arg3_type = ARG_PTR_TO_MAP_KEY, 8766 .arg4_type = ARG_ANYTHING, 8767 }; 8768 8769 BPF_CALL_4(sk_reuseport_load_bytes, 8770 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8771 void *, to, u32, len) 8772 { 8773 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 8774 } 8775 8776 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 8777 .func = sk_reuseport_load_bytes, 8778 .gpl_only = false, 8779 .ret_type = RET_INTEGER, 8780 .arg1_type = ARG_PTR_TO_CTX, 8781 .arg2_type = ARG_ANYTHING, 8782 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8783 .arg4_type = ARG_CONST_SIZE, 8784 }; 8785 8786 BPF_CALL_5(sk_reuseport_load_bytes_relative, 8787 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8788 void *, to, u32, len, u32, start_header) 8789 { 8790 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 8791 len, start_header); 8792 } 8793 8794 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 8795 .func = sk_reuseport_load_bytes_relative, 8796 .gpl_only = false, 8797 .ret_type = RET_INTEGER, 8798 .arg1_type = ARG_PTR_TO_CTX, 8799 .arg2_type = ARG_ANYTHING, 8800 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8801 .arg4_type = ARG_CONST_SIZE, 8802 .arg5_type = ARG_ANYTHING, 8803 }; 8804 8805 static const struct bpf_func_proto * 8806 sk_reuseport_func_proto(enum bpf_func_id func_id, 8807 const struct bpf_prog *prog) 8808 { 8809 switch (func_id) { 8810 case BPF_FUNC_sk_select_reuseport: 8811 return &sk_select_reuseport_proto; 8812 case BPF_FUNC_skb_load_bytes: 8813 return &sk_reuseport_load_bytes_proto; 8814 case BPF_FUNC_skb_load_bytes_relative: 8815 return &sk_reuseport_load_bytes_relative_proto; 8816 default: 8817 return bpf_base_func_proto(func_id); 8818 } 8819 } 8820 8821 static bool 8822 sk_reuseport_is_valid_access(int off, int size, 8823 enum bpf_access_type type, 8824 const struct bpf_prog *prog, 8825 struct bpf_insn_access_aux *info) 8826 { 8827 const u32 size_default = sizeof(__u32); 8828 8829 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 8830 off % size || type != BPF_READ) 8831 return false; 8832 8833 switch (off) { 8834 case offsetof(struct sk_reuseport_md, data): 8835 info->reg_type = PTR_TO_PACKET; 8836 return size == sizeof(__u64); 8837 8838 case offsetof(struct sk_reuseport_md, data_end): 8839 info->reg_type = PTR_TO_PACKET_END; 8840 return size == sizeof(__u64); 8841 8842 case offsetof(struct sk_reuseport_md, hash): 8843 return size == size_default; 8844 8845 /* Fields that allow narrowing */ 8846 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 8847 if (size < FIELD_SIZEOF(struct sk_buff, protocol)) 8848 return false; 8849 /* fall through */ 8850 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 8851 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 8852 case bpf_ctx_range(struct sk_reuseport_md, len): 8853 bpf_ctx_record_field_size(info, size_default); 8854 return bpf_ctx_narrow_access_ok(off, size, size_default); 8855 8856 default: 8857 return false; 8858 } 8859 } 8860 8861 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 8862 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 8863 si->dst_reg, si->src_reg, \ 8864 bpf_target_off(struct sk_reuseport_kern, F, \ 8865 FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 8866 target_size)); \ 8867 }) 8868 8869 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 8870 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 8871 struct sk_buff, \ 8872 skb, \ 8873 SKB_FIELD) 8874 8875 #define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \ 8876 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \ 8877 struct sock, \ 8878 sk, \ 8879 SK_FIELD, BPF_SIZE, EXTRA_OFF) 8880 8881 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 8882 const struct bpf_insn *si, 8883 struct bpf_insn *insn_buf, 8884 struct bpf_prog *prog, 8885 u32 *target_size) 8886 { 8887 struct bpf_insn *insn = insn_buf; 8888 8889 switch (si->off) { 8890 case offsetof(struct sk_reuseport_md, data): 8891 SK_REUSEPORT_LOAD_SKB_FIELD(data); 8892 break; 8893 8894 case offsetof(struct sk_reuseport_md, len): 8895 SK_REUSEPORT_LOAD_SKB_FIELD(len); 8896 break; 8897 8898 case offsetof(struct sk_reuseport_md, eth_protocol): 8899 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 8900 break; 8901 8902 case offsetof(struct sk_reuseport_md, ip_protocol): 8903 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE); 8904 SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset, 8905 BPF_W, 0); 8906 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 8907 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 8908 SK_FL_PROTO_SHIFT); 8909 /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian 8910 * aware. No further narrowing or masking is needed. 8911 */ 8912 *target_size = 1; 8913 break; 8914 8915 case offsetof(struct sk_reuseport_md, data_end): 8916 SK_REUSEPORT_LOAD_FIELD(data_end); 8917 break; 8918 8919 case offsetof(struct sk_reuseport_md, hash): 8920 SK_REUSEPORT_LOAD_FIELD(hash); 8921 break; 8922 8923 case offsetof(struct sk_reuseport_md, bind_inany): 8924 SK_REUSEPORT_LOAD_FIELD(bind_inany); 8925 break; 8926 } 8927 8928 return insn - insn_buf; 8929 } 8930 8931 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 8932 .get_func_proto = sk_reuseport_func_proto, 8933 .is_valid_access = sk_reuseport_is_valid_access, 8934 .convert_ctx_access = sk_reuseport_convert_ctx_access, 8935 }; 8936 8937 const struct bpf_prog_ops sk_reuseport_prog_ops = { 8938 }; 8939 #endif /* CONFIG_INET */ 8940