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/atomic.h> 21 #include <linux/module.h> 22 #include <linux/types.h> 23 #include <linux/mm.h> 24 #include <linux/fcntl.h> 25 #include <linux/socket.h> 26 #include <linux/sock_diag.h> 27 #include <linux/in.h> 28 #include <linux/inet.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_packet.h> 31 #include <linux/if_arp.h> 32 #include <linux/gfp.h> 33 #include <net/inet_common.h> 34 #include <net/ip.h> 35 #include <net/protocol.h> 36 #include <net/netlink.h> 37 #include <linux/skbuff.h> 38 #include <linux/skmsg.h> 39 #include <net/sock.h> 40 #include <net/flow_dissector.h> 41 #include <linux/errno.h> 42 #include <linux/timer.h> 43 #include <linux/uaccess.h> 44 #include <asm/unaligned.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 <linux/btf.h> 51 #include <net/sch_generic.h> 52 #include <net/cls_cgroup.h> 53 #include <net/dst_metadata.h> 54 #include <net/dst.h> 55 #include <net/sock_reuseport.h> 56 #include <net/busy_poll.h> 57 #include <net/tcp.h> 58 #include <net/xfrm.h> 59 #include <net/udp.h> 60 #include <linux/bpf_trace.h> 61 #include <net/xdp_sock.h> 62 #include <linux/inetdevice.h> 63 #include <net/inet_hashtables.h> 64 #include <net/inet6_hashtables.h> 65 #include <net/ip_fib.h> 66 #include <net/nexthop.h> 67 #include <net/flow.h> 68 #include <net/arp.h> 69 #include <net/ipv6.h> 70 #include <net/net_namespace.h> 71 #include <linux/seg6_local.h> 72 #include <net/seg6.h> 73 #include <net/seg6_local.h> 74 #include <net/lwtunnel.h> 75 #include <net/ipv6_stubs.h> 76 #include <net/bpf_sk_storage.h> 77 #include <net/transp_v6.h> 78 #include <linux/btf_ids.h> 79 #include <net/tls.h> 80 81 static const struct bpf_func_proto * 82 bpf_sk_base_func_proto(enum bpf_func_id func_id); 83 84 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) 85 { 86 if (in_compat_syscall()) { 87 struct compat_sock_fprog f32; 88 89 if (len != sizeof(f32)) 90 return -EINVAL; 91 if (copy_from_sockptr(&f32, src, sizeof(f32))) 92 return -EFAULT; 93 memset(dst, 0, sizeof(*dst)); 94 dst->len = f32.len; 95 dst->filter = compat_ptr(f32.filter); 96 } else { 97 if (len != sizeof(*dst)) 98 return -EINVAL; 99 if (copy_from_sockptr(dst, src, sizeof(*dst))) 100 return -EFAULT; 101 } 102 103 return 0; 104 } 105 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); 106 107 /** 108 * sk_filter_trim_cap - run a packet through a socket filter 109 * @sk: sock associated with &sk_buff 110 * @skb: buffer to filter 111 * @cap: limit on how short the eBPF program may trim the packet 112 * 113 * Run the eBPF program and then cut skb->data to correct size returned by 114 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 115 * than pkt_len we keep whole skb->data. This is the socket level 116 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should 117 * be accepted or -EPERM if the packet should be tossed. 118 * 119 */ 120 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 121 { 122 int err; 123 struct sk_filter *filter; 124 125 /* 126 * If the skb was allocated from pfmemalloc reserves, only 127 * allow SOCK_MEMALLOC sockets to use it as this socket is 128 * helping free memory 129 */ 130 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 131 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 132 return -ENOMEM; 133 } 134 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 135 if (err) 136 return err; 137 138 err = security_sock_rcv_skb(sk, skb); 139 if (err) 140 return err; 141 142 rcu_read_lock(); 143 filter = rcu_dereference(sk->sk_filter); 144 if (filter) { 145 struct sock *save_sk = skb->sk; 146 unsigned int pkt_len; 147 148 skb->sk = sk; 149 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 150 skb->sk = save_sk; 151 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 152 } 153 rcu_read_unlock(); 154 155 return err; 156 } 157 EXPORT_SYMBOL(sk_filter_trim_cap); 158 159 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 160 { 161 return skb_get_poff(skb); 162 } 163 164 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 165 { 166 struct nlattr *nla; 167 168 if (skb_is_nonlinear(skb)) 169 return 0; 170 171 if (skb->len < sizeof(struct nlattr)) 172 return 0; 173 174 if (a > skb->len - sizeof(struct nlattr)) 175 return 0; 176 177 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 178 if (nla) 179 return (void *) nla - (void *) skb->data; 180 181 return 0; 182 } 183 184 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 185 { 186 struct nlattr *nla; 187 188 if (skb_is_nonlinear(skb)) 189 return 0; 190 191 if (skb->len < sizeof(struct nlattr)) 192 return 0; 193 194 if (a > skb->len - sizeof(struct nlattr)) 195 return 0; 196 197 nla = (struct nlattr *) &skb->data[a]; 198 if (nla->nla_len > skb->len - a) 199 return 0; 200 201 nla = nla_find_nested(nla, x); 202 if (nla) 203 return (void *) nla - (void *) skb->data; 204 205 return 0; 206 } 207 208 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 209 data, int, headlen, int, offset) 210 { 211 u8 tmp, *ptr; 212 const int len = sizeof(tmp); 213 214 if (offset >= 0) { 215 if (headlen - offset >= len) 216 return *(u8 *)(data + offset); 217 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 218 return tmp; 219 } else { 220 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 221 if (likely(ptr)) 222 return *(u8 *)ptr; 223 } 224 225 return -EFAULT; 226 } 227 228 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 229 int, offset) 230 { 231 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 232 offset); 233 } 234 235 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 236 data, int, headlen, int, offset) 237 { 238 u16 tmp, *ptr; 239 const int len = sizeof(tmp); 240 241 if (offset >= 0) { 242 if (headlen - offset >= len) 243 return get_unaligned_be16(data + offset); 244 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 245 return be16_to_cpu(tmp); 246 } else { 247 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 248 if (likely(ptr)) 249 return get_unaligned_be16(ptr); 250 } 251 252 return -EFAULT; 253 } 254 255 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 256 int, offset) 257 { 258 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 259 offset); 260 } 261 262 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 263 data, int, headlen, int, offset) 264 { 265 u32 tmp, *ptr; 266 const int len = sizeof(tmp); 267 268 if (likely(offset >= 0)) { 269 if (headlen - offset >= len) 270 return get_unaligned_be32(data + offset); 271 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 272 return be32_to_cpu(tmp); 273 } else { 274 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 275 if (likely(ptr)) 276 return get_unaligned_be32(ptr); 277 } 278 279 return -EFAULT; 280 } 281 282 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 283 int, offset) 284 { 285 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 286 offset); 287 } 288 289 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 290 struct bpf_insn *insn_buf) 291 { 292 struct bpf_insn *insn = insn_buf; 293 294 switch (skb_field) { 295 case SKF_AD_MARK: 296 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 297 298 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 299 offsetof(struct sk_buff, mark)); 300 break; 301 302 case SKF_AD_PKTTYPE: 303 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); 304 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 305 #ifdef __BIG_ENDIAN_BITFIELD 306 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 307 #endif 308 break; 309 310 case SKF_AD_QUEUE: 311 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 312 313 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 314 offsetof(struct sk_buff, queue_mapping)); 315 break; 316 317 case SKF_AD_VLAN_TAG: 318 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 319 320 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 321 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 322 offsetof(struct sk_buff, vlan_tci)); 323 break; 324 case SKF_AD_VLAN_TAG_PRESENT: 325 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); 326 if (PKT_VLAN_PRESENT_BIT) 327 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); 328 if (PKT_VLAN_PRESENT_BIT < 7) 329 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); 330 break; 331 } 332 333 return insn - insn_buf; 334 } 335 336 static bool convert_bpf_extensions(struct sock_filter *fp, 337 struct bpf_insn **insnp) 338 { 339 struct bpf_insn *insn = *insnp; 340 u32 cnt; 341 342 switch (fp->k) { 343 case SKF_AD_OFF + SKF_AD_PROTOCOL: 344 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 345 346 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 347 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 348 offsetof(struct sk_buff, protocol)); 349 /* A = ntohs(A) [emitting a nop or swap16] */ 350 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 351 break; 352 353 case SKF_AD_OFF + SKF_AD_PKTTYPE: 354 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 355 insn += cnt - 1; 356 break; 357 358 case SKF_AD_OFF + SKF_AD_IFINDEX: 359 case SKF_AD_OFF + SKF_AD_HATYPE: 360 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 361 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 362 363 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 364 BPF_REG_TMP, BPF_REG_CTX, 365 offsetof(struct sk_buff, dev)); 366 /* if (tmp != 0) goto pc + 1 */ 367 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 368 *insn++ = BPF_EXIT_INSN(); 369 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 370 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 371 offsetof(struct net_device, ifindex)); 372 else 373 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 374 offsetof(struct net_device, type)); 375 break; 376 377 case SKF_AD_OFF + SKF_AD_MARK: 378 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 379 insn += cnt - 1; 380 break; 381 382 case SKF_AD_OFF + SKF_AD_RXHASH: 383 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 384 385 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 386 offsetof(struct sk_buff, hash)); 387 break; 388 389 case SKF_AD_OFF + SKF_AD_QUEUE: 390 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 391 insn += cnt - 1; 392 break; 393 394 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 395 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 396 BPF_REG_A, BPF_REG_CTX, insn); 397 insn += cnt - 1; 398 break; 399 400 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 401 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 402 BPF_REG_A, BPF_REG_CTX, insn); 403 insn += cnt - 1; 404 break; 405 406 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 407 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 408 409 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 410 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 411 offsetof(struct sk_buff, vlan_proto)); 412 /* A = ntohs(A) [emitting a nop or swap16] */ 413 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 414 break; 415 416 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 417 case SKF_AD_OFF + SKF_AD_NLATTR: 418 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 419 case SKF_AD_OFF + SKF_AD_CPU: 420 case SKF_AD_OFF + SKF_AD_RANDOM: 421 /* arg1 = CTX */ 422 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 423 /* arg2 = A */ 424 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 425 /* arg3 = X */ 426 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 427 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 428 switch (fp->k) { 429 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 430 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 431 break; 432 case SKF_AD_OFF + SKF_AD_NLATTR: 433 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 434 break; 435 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 436 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 437 break; 438 case SKF_AD_OFF + SKF_AD_CPU: 439 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 440 break; 441 case SKF_AD_OFF + SKF_AD_RANDOM: 442 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 443 bpf_user_rnd_init_once(); 444 break; 445 } 446 break; 447 448 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 449 /* A ^= X */ 450 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 451 break; 452 453 default: 454 /* This is just a dummy call to avoid letting the compiler 455 * evict __bpf_call_base() as an optimization. Placed here 456 * where no-one bothers. 457 */ 458 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 459 return false; 460 } 461 462 *insnp = insn; 463 return true; 464 } 465 466 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 467 { 468 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 469 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 470 bool endian = BPF_SIZE(fp->code) == BPF_H || 471 BPF_SIZE(fp->code) == BPF_W; 472 bool indirect = BPF_MODE(fp->code) == BPF_IND; 473 const int ip_align = NET_IP_ALIGN; 474 struct bpf_insn *insn = *insnp; 475 int offset = fp->k; 476 477 if (!indirect && 478 ((unaligned_ok && offset >= 0) || 479 (!unaligned_ok && offset >= 0 && 480 offset + ip_align >= 0 && 481 offset + ip_align % size == 0))) { 482 bool ldx_off_ok = offset <= S16_MAX; 483 484 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 485 if (offset) 486 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 487 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 488 size, 2 + endian + (!ldx_off_ok * 2)); 489 if (ldx_off_ok) { 490 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 491 BPF_REG_D, offset); 492 } else { 493 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 494 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 495 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 496 BPF_REG_TMP, 0); 497 } 498 if (endian) 499 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 500 *insn++ = BPF_JMP_A(8); 501 } 502 503 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 504 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 505 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 506 if (!indirect) { 507 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 508 } else { 509 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 510 if (fp->k) 511 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 512 } 513 514 switch (BPF_SIZE(fp->code)) { 515 case BPF_B: 516 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 517 break; 518 case BPF_H: 519 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 520 break; 521 case BPF_W: 522 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 523 break; 524 default: 525 return false; 526 } 527 528 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 529 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 530 *insn = BPF_EXIT_INSN(); 531 532 *insnp = insn; 533 return true; 534 } 535 536 /** 537 * bpf_convert_filter - convert filter program 538 * @prog: the user passed filter program 539 * @len: the length of the user passed filter program 540 * @new_prog: allocated 'struct bpf_prog' or NULL 541 * @new_len: pointer to store length of converted program 542 * @seen_ld_abs: bool whether we've seen ld_abs/ind 543 * 544 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 545 * style extended BPF (eBPF). 546 * Conversion workflow: 547 * 548 * 1) First pass for calculating the new program length: 549 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 550 * 551 * 2) 2nd pass to remap in two passes: 1st pass finds new 552 * jump offsets, 2nd pass remapping: 553 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 554 */ 555 static int bpf_convert_filter(struct sock_filter *prog, int len, 556 struct bpf_prog *new_prog, int *new_len, 557 bool *seen_ld_abs) 558 { 559 int new_flen = 0, pass = 0, target, i, stack_off; 560 struct bpf_insn *new_insn, *first_insn = NULL; 561 struct sock_filter *fp; 562 int *addrs = NULL; 563 u8 bpf_src; 564 565 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 566 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 567 568 if (len <= 0 || len > BPF_MAXINSNS) 569 return -EINVAL; 570 571 if (new_prog) { 572 first_insn = new_prog->insnsi; 573 addrs = kcalloc(len, sizeof(*addrs), 574 GFP_KERNEL | __GFP_NOWARN); 575 if (!addrs) 576 return -ENOMEM; 577 } 578 579 do_pass: 580 new_insn = first_insn; 581 fp = prog; 582 583 /* Classic BPF related prologue emission. */ 584 if (new_prog) { 585 /* Classic BPF expects A and X to be reset first. These need 586 * to be guaranteed to be the first two instructions. 587 */ 588 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 589 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 590 591 /* All programs must keep CTX in callee saved BPF_REG_CTX. 592 * In eBPF case it's done by the compiler, here we need to 593 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 594 */ 595 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 596 if (*seen_ld_abs) { 597 /* For packet access in classic BPF, cache skb->data 598 * in callee-saved BPF R8 and skb->len - skb->data_len 599 * (headlen) in BPF R9. Since classic BPF is read-only 600 * on CTX, we only need to cache it once. 601 */ 602 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 603 BPF_REG_D, BPF_REG_CTX, 604 offsetof(struct sk_buff, data)); 605 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 606 offsetof(struct sk_buff, len)); 607 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 608 offsetof(struct sk_buff, data_len)); 609 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 610 } 611 } else { 612 new_insn += 3; 613 } 614 615 for (i = 0; i < len; fp++, i++) { 616 struct bpf_insn tmp_insns[32] = { }; 617 struct bpf_insn *insn = tmp_insns; 618 619 if (addrs) 620 addrs[i] = new_insn - first_insn; 621 622 switch (fp->code) { 623 /* All arithmetic insns and skb loads map as-is. */ 624 case BPF_ALU | BPF_ADD | BPF_X: 625 case BPF_ALU | BPF_ADD | BPF_K: 626 case BPF_ALU | BPF_SUB | BPF_X: 627 case BPF_ALU | BPF_SUB | BPF_K: 628 case BPF_ALU | BPF_AND | BPF_X: 629 case BPF_ALU | BPF_AND | BPF_K: 630 case BPF_ALU | BPF_OR | BPF_X: 631 case BPF_ALU | BPF_OR | BPF_K: 632 case BPF_ALU | BPF_LSH | BPF_X: 633 case BPF_ALU | BPF_LSH | BPF_K: 634 case BPF_ALU | BPF_RSH | BPF_X: 635 case BPF_ALU | BPF_RSH | BPF_K: 636 case BPF_ALU | BPF_XOR | BPF_X: 637 case BPF_ALU | BPF_XOR | BPF_K: 638 case BPF_ALU | BPF_MUL | BPF_X: 639 case BPF_ALU | BPF_MUL | BPF_K: 640 case BPF_ALU | BPF_DIV | BPF_X: 641 case BPF_ALU | BPF_DIV | BPF_K: 642 case BPF_ALU | BPF_MOD | BPF_X: 643 case BPF_ALU | BPF_MOD | BPF_K: 644 case BPF_ALU | BPF_NEG: 645 case BPF_LD | BPF_ABS | BPF_W: 646 case BPF_LD | BPF_ABS | BPF_H: 647 case BPF_LD | BPF_ABS | BPF_B: 648 case BPF_LD | BPF_IND | BPF_W: 649 case BPF_LD | BPF_IND | BPF_H: 650 case BPF_LD | BPF_IND | BPF_B: 651 /* Check for overloaded BPF extension and 652 * directly convert it if found, otherwise 653 * just move on with mapping. 654 */ 655 if (BPF_CLASS(fp->code) == BPF_LD && 656 BPF_MODE(fp->code) == BPF_ABS && 657 convert_bpf_extensions(fp, &insn)) 658 break; 659 if (BPF_CLASS(fp->code) == BPF_LD && 660 convert_bpf_ld_abs(fp, &insn)) { 661 *seen_ld_abs = true; 662 break; 663 } 664 665 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 666 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 667 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 668 /* Error with exception code on div/mod by 0. 669 * For cBPF programs, this was always return 0. 670 */ 671 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 672 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 673 *insn++ = BPF_EXIT_INSN(); 674 } 675 676 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 677 break; 678 679 /* Jump transformation cannot use BPF block macros 680 * everywhere as offset calculation and target updates 681 * require a bit more work than the rest, i.e. jump 682 * opcodes map as-is, but offsets need adjustment. 683 */ 684 685 #define BPF_EMIT_JMP \ 686 do { \ 687 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 688 s32 off; \ 689 \ 690 if (target >= len || target < 0) \ 691 goto err; \ 692 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 693 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 694 off -= insn - tmp_insns; \ 695 /* Reject anything not fitting into insn->off. */ \ 696 if (off < off_min || off > off_max) \ 697 goto err; \ 698 insn->off = off; \ 699 } while (0) 700 701 case BPF_JMP | BPF_JA: 702 target = i + fp->k + 1; 703 insn->code = fp->code; 704 BPF_EMIT_JMP; 705 break; 706 707 case BPF_JMP | BPF_JEQ | BPF_K: 708 case BPF_JMP | BPF_JEQ | BPF_X: 709 case BPF_JMP | BPF_JSET | BPF_K: 710 case BPF_JMP | BPF_JSET | BPF_X: 711 case BPF_JMP | BPF_JGT | BPF_K: 712 case BPF_JMP | BPF_JGT | BPF_X: 713 case BPF_JMP | BPF_JGE | BPF_K: 714 case BPF_JMP | BPF_JGE | BPF_X: 715 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 716 /* BPF immediates are signed, zero extend 717 * immediate into tmp register and use it 718 * in compare insn. 719 */ 720 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 721 722 insn->dst_reg = BPF_REG_A; 723 insn->src_reg = BPF_REG_TMP; 724 bpf_src = BPF_X; 725 } else { 726 insn->dst_reg = BPF_REG_A; 727 insn->imm = fp->k; 728 bpf_src = BPF_SRC(fp->code); 729 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 730 } 731 732 /* Common case where 'jump_false' is next insn. */ 733 if (fp->jf == 0) { 734 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 735 target = i + fp->jt + 1; 736 BPF_EMIT_JMP; 737 break; 738 } 739 740 /* Convert some jumps when 'jump_true' is next insn. */ 741 if (fp->jt == 0) { 742 switch (BPF_OP(fp->code)) { 743 case BPF_JEQ: 744 insn->code = BPF_JMP | BPF_JNE | bpf_src; 745 break; 746 case BPF_JGT: 747 insn->code = BPF_JMP | BPF_JLE | bpf_src; 748 break; 749 case BPF_JGE: 750 insn->code = BPF_JMP | BPF_JLT | bpf_src; 751 break; 752 default: 753 goto jmp_rest; 754 } 755 756 target = i + fp->jf + 1; 757 BPF_EMIT_JMP; 758 break; 759 } 760 jmp_rest: 761 /* Other jumps are mapped into two insns: Jxx and JA. */ 762 target = i + fp->jt + 1; 763 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 764 BPF_EMIT_JMP; 765 insn++; 766 767 insn->code = BPF_JMP | BPF_JA; 768 target = i + fp->jf + 1; 769 BPF_EMIT_JMP; 770 break; 771 772 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 773 case BPF_LDX | BPF_MSH | BPF_B: { 774 struct sock_filter tmp = { 775 .code = BPF_LD | BPF_ABS | BPF_B, 776 .k = fp->k, 777 }; 778 779 *seen_ld_abs = true; 780 781 /* X = A */ 782 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 783 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 784 convert_bpf_ld_abs(&tmp, &insn); 785 insn++; 786 /* A &= 0xf */ 787 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 788 /* A <<= 2 */ 789 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 790 /* tmp = X */ 791 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 792 /* X = A */ 793 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 794 /* A = tmp */ 795 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 796 break; 797 } 798 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 799 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 800 */ 801 case BPF_RET | BPF_A: 802 case BPF_RET | BPF_K: 803 if (BPF_RVAL(fp->code) == BPF_K) 804 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 805 0, fp->k); 806 *insn = BPF_EXIT_INSN(); 807 break; 808 809 /* Store to stack. */ 810 case BPF_ST: 811 case BPF_STX: 812 stack_off = fp->k * 4 + 4; 813 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 814 BPF_ST ? BPF_REG_A : BPF_REG_X, 815 -stack_off); 816 /* check_load_and_stores() verifies that classic BPF can 817 * load from stack only after write, so tracking 818 * stack_depth for ST|STX insns is enough 819 */ 820 if (new_prog && new_prog->aux->stack_depth < stack_off) 821 new_prog->aux->stack_depth = stack_off; 822 break; 823 824 /* Load from stack. */ 825 case BPF_LD | BPF_MEM: 826 case BPF_LDX | BPF_MEM: 827 stack_off = fp->k * 4 + 4; 828 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 829 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 830 -stack_off); 831 break; 832 833 /* A = K or X = K */ 834 case BPF_LD | BPF_IMM: 835 case BPF_LDX | BPF_IMM: 836 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 837 BPF_REG_A : BPF_REG_X, fp->k); 838 break; 839 840 /* X = A */ 841 case BPF_MISC | BPF_TAX: 842 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 843 break; 844 845 /* A = X */ 846 case BPF_MISC | BPF_TXA: 847 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 848 break; 849 850 /* A = skb->len or X = skb->len */ 851 case BPF_LD | BPF_W | BPF_LEN: 852 case BPF_LDX | BPF_W | BPF_LEN: 853 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 854 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 855 offsetof(struct sk_buff, len)); 856 break; 857 858 /* Access seccomp_data fields. */ 859 case BPF_LDX | BPF_ABS | BPF_W: 860 /* A = *(u32 *) (ctx + K) */ 861 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 862 break; 863 864 /* Unknown instruction. */ 865 default: 866 goto err; 867 } 868 869 insn++; 870 if (new_prog) 871 memcpy(new_insn, tmp_insns, 872 sizeof(*insn) * (insn - tmp_insns)); 873 new_insn += insn - tmp_insns; 874 } 875 876 if (!new_prog) { 877 /* Only calculating new length. */ 878 *new_len = new_insn - first_insn; 879 if (*seen_ld_abs) 880 *new_len += 4; /* Prologue bits. */ 881 return 0; 882 } 883 884 pass++; 885 if (new_flen != new_insn - first_insn) { 886 new_flen = new_insn - first_insn; 887 if (pass > 2) 888 goto err; 889 goto do_pass; 890 } 891 892 kfree(addrs); 893 BUG_ON(*new_len != new_flen); 894 return 0; 895 err: 896 kfree(addrs); 897 return -EINVAL; 898 } 899 900 /* Security: 901 * 902 * As we dont want to clear mem[] array for each packet going through 903 * __bpf_prog_run(), we check that filter loaded by user never try to read 904 * a cell if not previously written, and we check all branches to be sure 905 * a malicious user doesn't try to abuse us. 906 */ 907 static int check_load_and_stores(const struct sock_filter *filter, int flen) 908 { 909 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 910 int pc, ret = 0; 911 912 BUILD_BUG_ON(BPF_MEMWORDS > 16); 913 914 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 915 if (!masks) 916 return -ENOMEM; 917 918 memset(masks, 0xff, flen * sizeof(*masks)); 919 920 for (pc = 0; pc < flen; pc++) { 921 memvalid &= masks[pc]; 922 923 switch (filter[pc].code) { 924 case BPF_ST: 925 case BPF_STX: 926 memvalid |= (1 << filter[pc].k); 927 break; 928 case BPF_LD | BPF_MEM: 929 case BPF_LDX | BPF_MEM: 930 if (!(memvalid & (1 << filter[pc].k))) { 931 ret = -EINVAL; 932 goto error; 933 } 934 break; 935 case BPF_JMP | BPF_JA: 936 /* A jump must set masks on target */ 937 masks[pc + 1 + filter[pc].k] &= memvalid; 938 memvalid = ~0; 939 break; 940 case BPF_JMP | BPF_JEQ | BPF_K: 941 case BPF_JMP | BPF_JEQ | BPF_X: 942 case BPF_JMP | BPF_JGE | BPF_K: 943 case BPF_JMP | BPF_JGE | BPF_X: 944 case BPF_JMP | BPF_JGT | BPF_K: 945 case BPF_JMP | BPF_JGT | BPF_X: 946 case BPF_JMP | BPF_JSET | BPF_K: 947 case BPF_JMP | BPF_JSET | BPF_X: 948 /* A jump must set masks on targets */ 949 masks[pc + 1 + filter[pc].jt] &= memvalid; 950 masks[pc + 1 + filter[pc].jf] &= memvalid; 951 memvalid = ~0; 952 break; 953 } 954 } 955 error: 956 kfree(masks); 957 return ret; 958 } 959 960 static bool chk_code_allowed(u16 code_to_probe) 961 { 962 static const bool codes[] = { 963 /* 32 bit ALU operations */ 964 [BPF_ALU | BPF_ADD | BPF_K] = true, 965 [BPF_ALU | BPF_ADD | BPF_X] = true, 966 [BPF_ALU | BPF_SUB | BPF_K] = true, 967 [BPF_ALU | BPF_SUB | BPF_X] = true, 968 [BPF_ALU | BPF_MUL | BPF_K] = true, 969 [BPF_ALU | BPF_MUL | BPF_X] = true, 970 [BPF_ALU | BPF_DIV | BPF_K] = true, 971 [BPF_ALU | BPF_DIV | BPF_X] = true, 972 [BPF_ALU | BPF_MOD | BPF_K] = true, 973 [BPF_ALU | BPF_MOD | BPF_X] = true, 974 [BPF_ALU | BPF_AND | BPF_K] = true, 975 [BPF_ALU | BPF_AND | BPF_X] = true, 976 [BPF_ALU | BPF_OR | BPF_K] = true, 977 [BPF_ALU | BPF_OR | BPF_X] = true, 978 [BPF_ALU | BPF_XOR | BPF_K] = true, 979 [BPF_ALU | BPF_XOR | BPF_X] = true, 980 [BPF_ALU | BPF_LSH | BPF_K] = true, 981 [BPF_ALU | BPF_LSH | BPF_X] = true, 982 [BPF_ALU | BPF_RSH | BPF_K] = true, 983 [BPF_ALU | BPF_RSH | BPF_X] = true, 984 [BPF_ALU | BPF_NEG] = true, 985 /* Load instructions */ 986 [BPF_LD | BPF_W | BPF_ABS] = true, 987 [BPF_LD | BPF_H | BPF_ABS] = true, 988 [BPF_LD | BPF_B | BPF_ABS] = true, 989 [BPF_LD | BPF_W | BPF_LEN] = true, 990 [BPF_LD | BPF_W | BPF_IND] = true, 991 [BPF_LD | BPF_H | BPF_IND] = true, 992 [BPF_LD | BPF_B | BPF_IND] = true, 993 [BPF_LD | BPF_IMM] = true, 994 [BPF_LD | BPF_MEM] = true, 995 [BPF_LDX | BPF_W | BPF_LEN] = true, 996 [BPF_LDX | BPF_B | BPF_MSH] = true, 997 [BPF_LDX | BPF_IMM] = true, 998 [BPF_LDX | BPF_MEM] = true, 999 /* Store instructions */ 1000 [BPF_ST] = true, 1001 [BPF_STX] = true, 1002 /* Misc instructions */ 1003 [BPF_MISC | BPF_TAX] = true, 1004 [BPF_MISC | BPF_TXA] = true, 1005 /* Return instructions */ 1006 [BPF_RET | BPF_K] = true, 1007 [BPF_RET | BPF_A] = true, 1008 /* Jump instructions */ 1009 [BPF_JMP | BPF_JA] = true, 1010 [BPF_JMP | BPF_JEQ | BPF_K] = true, 1011 [BPF_JMP | BPF_JEQ | BPF_X] = true, 1012 [BPF_JMP | BPF_JGE | BPF_K] = true, 1013 [BPF_JMP | BPF_JGE | BPF_X] = true, 1014 [BPF_JMP | BPF_JGT | BPF_K] = true, 1015 [BPF_JMP | BPF_JGT | BPF_X] = true, 1016 [BPF_JMP | BPF_JSET | BPF_K] = true, 1017 [BPF_JMP | BPF_JSET | BPF_X] = true, 1018 }; 1019 1020 if (code_to_probe >= ARRAY_SIZE(codes)) 1021 return false; 1022 1023 return codes[code_to_probe]; 1024 } 1025 1026 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1027 unsigned int flen) 1028 { 1029 if (filter == NULL) 1030 return false; 1031 if (flen == 0 || flen > BPF_MAXINSNS) 1032 return false; 1033 1034 return true; 1035 } 1036 1037 /** 1038 * bpf_check_classic - verify socket filter code 1039 * @filter: filter to verify 1040 * @flen: length of filter 1041 * 1042 * Check the user's filter code. If we let some ugly 1043 * filter code slip through kaboom! The filter must contain 1044 * no references or jumps that are out of range, no illegal 1045 * instructions, and must end with a RET instruction. 1046 * 1047 * All jumps are forward as they are not signed. 1048 * 1049 * Returns 0 if the rule set is legal or -EINVAL if not. 1050 */ 1051 static int bpf_check_classic(const struct sock_filter *filter, 1052 unsigned int flen) 1053 { 1054 bool anc_found; 1055 int pc; 1056 1057 /* Check the filter code now */ 1058 for (pc = 0; pc < flen; pc++) { 1059 const struct sock_filter *ftest = &filter[pc]; 1060 1061 /* May we actually operate on this code? */ 1062 if (!chk_code_allowed(ftest->code)) 1063 return -EINVAL; 1064 1065 /* Some instructions need special checks */ 1066 switch (ftest->code) { 1067 case BPF_ALU | BPF_DIV | BPF_K: 1068 case BPF_ALU | BPF_MOD | BPF_K: 1069 /* Check for division by zero */ 1070 if (ftest->k == 0) 1071 return -EINVAL; 1072 break; 1073 case BPF_ALU | BPF_LSH | BPF_K: 1074 case BPF_ALU | BPF_RSH | BPF_K: 1075 if (ftest->k >= 32) 1076 return -EINVAL; 1077 break; 1078 case BPF_LD | BPF_MEM: 1079 case BPF_LDX | BPF_MEM: 1080 case BPF_ST: 1081 case BPF_STX: 1082 /* Check for invalid memory addresses */ 1083 if (ftest->k >= BPF_MEMWORDS) 1084 return -EINVAL; 1085 break; 1086 case BPF_JMP | BPF_JA: 1087 /* Note, the large ftest->k might cause loops. 1088 * Compare this with conditional jumps below, 1089 * where offsets are limited. --ANK (981016) 1090 */ 1091 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1092 return -EINVAL; 1093 break; 1094 case BPF_JMP | BPF_JEQ | BPF_K: 1095 case BPF_JMP | BPF_JEQ | BPF_X: 1096 case BPF_JMP | BPF_JGE | BPF_K: 1097 case BPF_JMP | BPF_JGE | BPF_X: 1098 case BPF_JMP | BPF_JGT | BPF_K: 1099 case BPF_JMP | BPF_JGT | BPF_X: 1100 case BPF_JMP | BPF_JSET | BPF_K: 1101 case BPF_JMP | BPF_JSET | BPF_X: 1102 /* Both conditionals must be safe */ 1103 if (pc + ftest->jt + 1 >= flen || 1104 pc + ftest->jf + 1 >= flen) 1105 return -EINVAL; 1106 break; 1107 case BPF_LD | BPF_W | BPF_ABS: 1108 case BPF_LD | BPF_H | BPF_ABS: 1109 case BPF_LD | BPF_B | BPF_ABS: 1110 anc_found = false; 1111 if (bpf_anc_helper(ftest) & BPF_ANC) 1112 anc_found = true; 1113 /* Ancillary operation unknown or unsupported */ 1114 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1115 return -EINVAL; 1116 } 1117 } 1118 1119 /* Last instruction must be a RET code */ 1120 switch (filter[flen - 1].code) { 1121 case BPF_RET | BPF_K: 1122 case BPF_RET | BPF_A: 1123 return check_load_and_stores(filter, flen); 1124 } 1125 1126 return -EINVAL; 1127 } 1128 1129 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1130 const struct sock_fprog *fprog) 1131 { 1132 unsigned int fsize = bpf_classic_proglen(fprog); 1133 struct sock_fprog_kern *fkprog; 1134 1135 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1136 if (!fp->orig_prog) 1137 return -ENOMEM; 1138 1139 fkprog = fp->orig_prog; 1140 fkprog->len = fprog->len; 1141 1142 fkprog->filter = kmemdup(fp->insns, fsize, 1143 GFP_KERNEL | __GFP_NOWARN); 1144 if (!fkprog->filter) { 1145 kfree(fp->orig_prog); 1146 return -ENOMEM; 1147 } 1148 1149 return 0; 1150 } 1151 1152 static void bpf_release_orig_filter(struct bpf_prog *fp) 1153 { 1154 struct sock_fprog_kern *fprog = fp->orig_prog; 1155 1156 if (fprog) { 1157 kfree(fprog->filter); 1158 kfree(fprog); 1159 } 1160 } 1161 1162 static void __bpf_prog_release(struct bpf_prog *prog) 1163 { 1164 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1165 bpf_prog_put(prog); 1166 } else { 1167 bpf_release_orig_filter(prog); 1168 bpf_prog_free(prog); 1169 } 1170 } 1171 1172 static void __sk_filter_release(struct sk_filter *fp) 1173 { 1174 __bpf_prog_release(fp->prog); 1175 kfree(fp); 1176 } 1177 1178 /** 1179 * sk_filter_release_rcu - Release a socket filter by rcu_head 1180 * @rcu: rcu_head that contains the sk_filter to free 1181 */ 1182 static void sk_filter_release_rcu(struct rcu_head *rcu) 1183 { 1184 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1185 1186 __sk_filter_release(fp); 1187 } 1188 1189 /** 1190 * sk_filter_release - release a socket filter 1191 * @fp: filter to remove 1192 * 1193 * Remove a filter from a socket and release its resources. 1194 */ 1195 static void sk_filter_release(struct sk_filter *fp) 1196 { 1197 if (refcount_dec_and_test(&fp->refcnt)) 1198 call_rcu(&fp->rcu, sk_filter_release_rcu); 1199 } 1200 1201 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1202 { 1203 u32 filter_size = bpf_prog_size(fp->prog->len); 1204 1205 atomic_sub(filter_size, &sk->sk_omem_alloc); 1206 sk_filter_release(fp); 1207 } 1208 1209 /* try to charge the socket memory if there is space available 1210 * return true on success 1211 */ 1212 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1213 { 1214 u32 filter_size = bpf_prog_size(fp->prog->len); 1215 1216 /* same check as in sock_kmalloc() */ 1217 if (filter_size <= sysctl_optmem_max && 1218 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { 1219 atomic_add(filter_size, &sk->sk_omem_alloc); 1220 return true; 1221 } 1222 return false; 1223 } 1224 1225 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1226 { 1227 if (!refcount_inc_not_zero(&fp->refcnt)) 1228 return false; 1229 1230 if (!__sk_filter_charge(sk, fp)) { 1231 sk_filter_release(fp); 1232 return false; 1233 } 1234 return true; 1235 } 1236 1237 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1238 { 1239 struct sock_filter *old_prog; 1240 struct bpf_prog *old_fp; 1241 int err, new_len, old_len = fp->len; 1242 bool seen_ld_abs = false; 1243 1244 /* We are free to overwrite insns et al right here as it 1245 * won't be used at this point in time anymore internally 1246 * after the migration to the internal BPF instruction 1247 * representation. 1248 */ 1249 BUILD_BUG_ON(sizeof(struct sock_filter) != 1250 sizeof(struct bpf_insn)); 1251 1252 /* Conversion cannot happen on overlapping memory areas, 1253 * so we need to keep the user BPF around until the 2nd 1254 * pass. At this time, the user BPF is stored in fp->insns. 1255 */ 1256 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1257 GFP_KERNEL | __GFP_NOWARN); 1258 if (!old_prog) { 1259 err = -ENOMEM; 1260 goto out_err; 1261 } 1262 1263 /* 1st pass: calculate the new program length. */ 1264 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1265 &seen_ld_abs); 1266 if (err) 1267 goto out_err_free; 1268 1269 /* Expand fp for appending the new filter representation. */ 1270 old_fp = fp; 1271 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1272 if (!fp) { 1273 /* The old_fp is still around in case we couldn't 1274 * allocate new memory, so uncharge on that one. 1275 */ 1276 fp = old_fp; 1277 err = -ENOMEM; 1278 goto out_err_free; 1279 } 1280 1281 fp->len = new_len; 1282 1283 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1284 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1285 &seen_ld_abs); 1286 if (err) 1287 /* 2nd bpf_convert_filter() can fail only if it fails 1288 * to allocate memory, remapping must succeed. Note, 1289 * that at this time old_fp has already been released 1290 * by krealloc(). 1291 */ 1292 goto out_err_free; 1293 1294 fp = bpf_prog_select_runtime(fp, &err); 1295 if (err) 1296 goto out_err_free; 1297 1298 kfree(old_prog); 1299 return fp; 1300 1301 out_err_free: 1302 kfree(old_prog); 1303 out_err: 1304 __bpf_prog_release(fp); 1305 return ERR_PTR(err); 1306 } 1307 1308 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1309 bpf_aux_classic_check_t trans) 1310 { 1311 int err; 1312 1313 fp->bpf_func = NULL; 1314 fp->jited = 0; 1315 1316 err = bpf_check_classic(fp->insns, fp->len); 1317 if (err) { 1318 __bpf_prog_release(fp); 1319 return ERR_PTR(err); 1320 } 1321 1322 /* There might be additional checks and transformations 1323 * needed on classic filters, f.e. in case of seccomp. 1324 */ 1325 if (trans) { 1326 err = trans(fp->insns, fp->len); 1327 if (err) { 1328 __bpf_prog_release(fp); 1329 return ERR_PTR(err); 1330 } 1331 } 1332 1333 /* Probe if we can JIT compile the filter and if so, do 1334 * the compilation of the filter. 1335 */ 1336 bpf_jit_compile(fp); 1337 1338 /* JIT compiler couldn't process this filter, so do the 1339 * internal BPF translation for the optimized interpreter. 1340 */ 1341 if (!fp->jited) 1342 fp = bpf_migrate_filter(fp); 1343 1344 return fp; 1345 } 1346 1347 /** 1348 * bpf_prog_create - create an unattached filter 1349 * @pfp: the unattached filter that is created 1350 * @fprog: the filter program 1351 * 1352 * Create a filter independent of any socket. We first run some 1353 * sanity checks on it to make sure it does not explode on us later. 1354 * If an error occurs or there is insufficient memory for the filter 1355 * a negative errno code is returned. On success the return is zero. 1356 */ 1357 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1358 { 1359 unsigned int fsize = bpf_classic_proglen(fprog); 1360 struct bpf_prog *fp; 1361 1362 /* Make sure new filter is there and in the right amounts. */ 1363 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1364 return -EINVAL; 1365 1366 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1367 if (!fp) 1368 return -ENOMEM; 1369 1370 memcpy(fp->insns, fprog->filter, fsize); 1371 1372 fp->len = fprog->len; 1373 /* Since unattached filters are not copied back to user 1374 * space through sk_get_filter(), we do not need to hold 1375 * a copy here, and can spare us the work. 1376 */ 1377 fp->orig_prog = NULL; 1378 1379 /* bpf_prepare_filter() already takes care of freeing 1380 * memory in case something goes wrong. 1381 */ 1382 fp = bpf_prepare_filter(fp, NULL); 1383 if (IS_ERR(fp)) 1384 return PTR_ERR(fp); 1385 1386 *pfp = fp; 1387 return 0; 1388 } 1389 EXPORT_SYMBOL_GPL(bpf_prog_create); 1390 1391 /** 1392 * bpf_prog_create_from_user - create an unattached filter from user buffer 1393 * @pfp: the unattached filter that is created 1394 * @fprog: the filter program 1395 * @trans: post-classic verifier transformation handler 1396 * @save_orig: save classic BPF program 1397 * 1398 * This function effectively does the same as bpf_prog_create(), only 1399 * that it builds up its insns buffer from user space provided buffer. 1400 * It also allows for passing a bpf_aux_classic_check_t handler. 1401 */ 1402 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1403 bpf_aux_classic_check_t trans, bool save_orig) 1404 { 1405 unsigned int fsize = bpf_classic_proglen(fprog); 1406 struct bpf_prog *fp; 1407 int err; 1408 1409 /* Make sure new filter is there and in the right amounts. */ 1410 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1411 return -EINVAL; 1412 1413 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1414 if (!fp) 1415 return -ENOMEM; 1416 1417 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1418 __bpf_prog_free(fp); 1419 return -EFAULT; 1420 } 1421 1422 fp->len = fprog->len; 1423 fp->orig_prog = NULL; 1424 1425 if (save_orig) { 1426 err = bpf_prog_store_orig_filter(fp, fprog); 1427 if (err) { 1428 __bpf_prog_free(fp); 1429 return -ENOMEM; 1430 } 1431 } 1432 1433 /* bpf_prepare_filter() already takes care of freeing 1434 * memory in case something goes wrong. 1435 */ 1436 fp = bpf_prepare_filter(fp, trans); 1437 if (IS_ERR(fp)) 1438 return PTR_ERR(fp); 1439 1440 *pfp = fp; 1441 return 0; 1442 } 1443 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1444 1445 void bpf_prog_destroy(struct bpf_prog *fp) 1446 { 1447 __bpf_prog_release(fp); 1448 } 1449 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1450 1451 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1452 { 1453 struct sk_filter *fp, *old_fp; 1454 1455 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1456 if (!fp) 1457 return -ENOMEM; 1458 1459 fp->prog = prog; 1460 1461 if (!__sk_filter_charge(sk, fp)) { 1462 kfree(fp); 1463 return -ENOMEM; 1464 } 1465 refcount_set(&fp->refcnt, 1); 1466 1467 old_fp = rcu_dereference_protected(sk->sk_filter, 1468 lockdep_sock_is_held(sk)); 1469 rcu_assign_pointer(sk->sk_filter, fp); 1470 1471 if (old_fp) 1472 sk_filter_uncharge(sk, old_fp); 1473 1474 return 0; 1475 } 1476 1477 static 1478 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1479 { 1480 unsigned int fsize = bpf_classic_proglen(fprog); 1481 struct bpf_prog *prog; 1482 int err; 1483 1484 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1485 return ERR_PTR(-EPERM); 1486 1487 /* Make sure new filter is there and in the right amounts. */ 1488 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1489 return ERR_PTR(-EINVAL); 1490 1491 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1492 if (!prog) 1493 return ERR_PTR(-ENOMEM); 1494 1495 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1496 __bpf_prog_free(prog); 1497 return ERR_PTR(-EFAULT); 1498 } 1499 1500 prog->len = fprog->len; 1501 1502 err = bpf_prog_store_orig_filter(prog, fprog); 1503 if (err) { 1504 __bpf_prog_free(prog); 1505 return ERR_PTR(-ENOMEM); 1506 } 1507 1508 /* bpf_prepare_filter() already takes care of freeing 1509 * memory in case something goes wrong. 1510 */ 1511 return bpf_prepare_filter(prog, NULL); 1512 } 1513 1514 /** 1515 * sk_attach_filter - attach a socket filter 1516 * @fprog: the filter program 1517 * @sk: the socket to use 1518 * 1519 * Attach the user's filter code. We first run some sanity checks on 1520 * it to make sure it does not explode on us later. If an error 1521 * occurs or there is insufficient memory for the filter a negative 1522 * errno code is returned. On success the return is zero. 1523 */ 1524 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1525 { 1526 struct bpf_prog *prog = __get_filter(fprog, sk); 1527 int err; 1528 1529 if (IS_ERR(prog)) 1530 return PTR_ERR(prog); 1531 1532 err = __sk_attach_prog(prog, sk); 1533 if (err < 0) { 1534 __bpf_prog_release(prog); 1535 return err; 1536 } 1537 1538 return 0; 1539 } 1540 EXPORT_SYMBOL_GPL(sk_attach_filter); 1541 1542 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1543 { 1544 struct bpf_prog *prog = __get_filter(fprog, sk); 1545 int err; 1546 1547 if (IS_ERR(prog)) 1548 return PTR_ERR(prog); 1549 1550 if (bpf_prog_size(prog->len) > sysctl_optmem_max) 1551 err = -ENOMEM; 1552 else 1553 err = reuseport_attach_prog(sk, prog); 1554 1555 if (err) 1556 __bpf_prog_release(prog); 1557 1558 return err; 1559 } 1560 1561 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1562 { 1563 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1564 return ERR_PTR(-EPERM); 1565 1566 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1567 } 1568 1569 int sk_attach_bpf(u32 ufd, struct sock *sk) 1570 { 1571 struct bpf_prog *prog = __get_bpf(ufd, sk); 1572 int err; 1573 1574 if (IS_ERR(prog)) 1575 return PTR_ERR(prog); 1576 1577 err = __sk_attach_prog(prog, sk); 1578 if (err < 0) { 1579 bpf_prog_put(prog); 1580 return err; 1581 } 1582 1583 return 0; 1584 } 1585 1586 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1587 { 1588 struct bpf_prog *prog; 1589 int err; 1590 1591 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1592 return -EPERM; 1593 1594 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1595 if (PTR_ERR(prog) == -EINVAL) 1596 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1597 if (IS_ERR(prog)) 1598 return PTR_ERR(prog); 1599 1600 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1601 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1602 * bpf prog (e.g. sockmap). It depends on the 1603 * limitation imposed by bpf_prog_load(). 1604 * Hence, sysctl_optmem_max is not checked. 1605 */ 1606 if ((sk->sk_type != SOCK_STREAM && 1607 sk->sk_type != SOCK_DGRAM) || 1608 (sk->sk_protocol != IPPROTO_UDP && 1609 sk->sk_protocol != IPPROTO_TCP) || 1610 (sk->sk_family != AF_INET && 1611 sk->sk_family != AF_INET6)) { 1612 err = -ENOTSUPP; 1613 goto err_prog_put; 1614 } 1615 } else { 1616 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1617 if (bpf_prog_size(prog->len) > sysctl_optmem_max) { 1618 err = -ENOMEM; 1619 goto err_prog_put; 1620 } 1621 } 1622 1623 err = reuseport_attach_prog(sk, prog); 1624 err_prog_put: 1625 if (err) 1626 bpf_prog_put(prog); 1627 1628 return err; 1629 } 1630 1631 void sk_reuseport_prog_free(struct bpf_prog *prog) 1632 { 1633 if (!prog) 1634 return; 1635 1636 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1637 bpf_prog_put(prog); 1638 else 1639 bpf_prog_destroy(prog); 1640 } 1641 1642 struct bpf_scratchpad { 1643 union { 1644 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1645 u8 buff[MAX_BPF_STACK]; 1646 }; 1647 }; 1648 1649 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1650 1651 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1652 unsigned int write_len) 1653 { 1654 return skb_ensure_writable(skb, write_len); 1655 } 1656 1657 static inline int bpf_try_make_writable(struct sk_buff *skb, 1658 unsigned int write_len) 1659 { 1660 int err = __bpf_try_make_writable(skb, write_len); 1661 1662 bpf_compute_data_pointers(skb); 1663 return err; 1664 } 1665 1666 static int bpf_try_make_head_writable(struct sk_buff *skb) 1667 { 1668 return bpf_try_make_writable(skb, skb_headlen(skb)); 1669 } 1670 1671 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1672 { 1673 if (skb_at_tc_ingress(skb)) 1674 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1675 } 1676 1677 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1678 { 1679 if (skb_at_tc_ingress(skb)) 1680 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1681 } 1682 1683 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1684 const void *, from, u32, len, u64, flags) 1685 { 1686 void *ptr; 1687 1688 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1689 return -EINVAL; 1690 if (unlikely(offset > 0xffff)) 1691 return -EFAULT; 1692 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1693 return -EFAULT; 1694 1695 ptr = skb->data + offset; 1696 if (flags & BPF_F_RECOMPUTE_CSUM) 1697 __skb_postpull_rcsum(skb, ptr, len, offset); 1698 1699 memcpy(ptr, from, len); 1700 1701 if (flags & BPF_F_RECOMPUTE_CSUM) 1702 __skb_postpush_rcsum(skb, ptr, len, offset); 1703 if (flags & BPF_F_INVALIDATE_HASH) 1704 skb_clear_hash(skb); 1705 1706 return 0; 1707 } 1708 1709 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1710 .func = bpf_skb_store_bytes, 1711 .gpl_only = false, 1712 .ret_type = RET_INTEGER, 1713 .arg1_type = ARG_PTR_TO_CTX, 1714 .arg2_type = ARG_ANYTHING, 1715 .arg3_type = ARG_PTR_TO_MEM, 1716 .arg4_type = ARG_CONST_SIZE, 1717 .arg5_type = ARG_ANYTHING, 1718 }; 1719 1720 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1721 void *, to, u32, len) 1722 { 1723 void *ptr; 1724 1725 if (unlikely(offset > 0xffff)) 1726 goto err_clear; 1727 1728 ptr = skb_header_pointer(skb, offset, len, to); 1729 if (unlikely(!ptr)) 1730 goto err_clear; 1731 if (ptr != to) 1732 memcpy(to, ptr, len); 1733 1734 return 0; 1735 err_clear: 1736 memset(to, 0, len); 1737 return -EFAULT; 1738 } 1739 1740 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1741 .func = bpf_skb_load_bytes, 1742 .gpl_only = false, 1743 .ret_type = RET_INTEGER, 1744 .arg1_type = ARG_PTR_TO_CTX, 1745 .arg2_type = ARG_ANYTHING, 1746 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1747 .arg4_type = ARG_CONST_SIZE, 1748 }; 1749 1750 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1751 const struct bpf_flow_dissector *, ctx, u32, offset, 1752 void *, to, u32, len) 1753 { 1754 void *ptr; 1755 1756 if (unlikely(offset > 0xffff)) 1757 goto err_clear; 1758 1759 if (unlikely(!ctx->skb)) 1760 goto err_clear; 1761 1762 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1763 if (unlikely(!ptr)) 1764 goto err_clear; 1765 if (ptr != to) 1766 memcpy(to, ptr, len); 1767 1768 return 0; 1769 err_clear: 1770 memset(to, 0, len); 1771 return -EFAULT; 1772 } 1773 1774 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1775 .func = bpf_flow_dissector_load_bytes, 1776 .gpl_only = false, 1777 .ret_type = RET_INTEGER, 1778 .arg1_type = ARG_PTR_TO_CTX, 1779 .arg2_type = ARG_ANYTHING, 1780 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1781 .arg4_type = ARG_CONST_SIZE, 1782 }; 1783 1784 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1785 u32, offset, void *, to, u32, len, u32, start_header) 1786 { 1787 u8 *end = skb_tail_pointer(skb); 1788 u8 *start, *ptr; 1789 1790 if (unlikely(offset > 0xffff)) 1791 goto err_clear; 1792 1793 switch (start_header) { 1794 case BPF_HDR_START_MAC: 1795 if (unlikely(!skb_mac_header_was_set(skb))) 1796 goto err_clear; 1797 start = skb_mac_header(skb); 1798 break; 1799 case BPF_HDR_START_NET: 1800 start = skb_network_header(skb); 1801 break; 1802 default: 1803 goto err_clear; 1804 } 1805 1806 ptr = start + offset; 1807 1808 if (likely(ptr + len <= end)) { 1809 memcpy(to, ptr, len); 1810 return 0; 1811 } 1812 1813 err_clear: 1814 memset(to, 0, len); 1815 return -EFAULT; 1816 } 1817 1818 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1819 .func = bpf_skb_load_bytes_relative, 1820 .gpl_only = false, 1821 .ret_type = RET_INTEGER, 1822 .arg1_type = ARG_PTR_TO_CTX, 1823 .arg2_type = ARG_ANYTHING, 1824 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1825 .arg4_type = ARG_CONST_SIZE, 1826 .arg5_type = ARG_ANYTHING, 1827 }; 1828 1829 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1830 { 1831 /* Idea is the following: should the needed direct read/write 1832 * test fail during runtime, we can pull in more data and redo 1833 * again, since implicitly, we invalidate previous checks here. 1834 * 1835 * Or, since we know how much we need to make read/writeable, 1836 * this can be done once at the program beginning for direct 1837 * access case. By this we overcome limitations of only current 1838 * headroom being accessible. 1839 */ 1840 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1841 } 1842 1843 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1844 .func = bpf_skb_pull_data, 1845 .gpl_only = false, 1846 .ret_type = RET_INTEGER, 1847 .arg1_type = ARG_PTR_TO_CTX, 1848 .arg2_type = ARG_ANYTHING, 1849 }; 1850 1851 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1852 { 1853 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1854 } 1855 1856 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1857 .func = bpf_sk_fullsock, 1858 .gpl_only = false, 1859 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1860 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1861 }; 1862 1863 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1864 unsigned int write_len) 1865 { 1866 return __bpf_try_make_writable(skb, write_len); 1867 } 1868 1869 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1870 { 1871 /* Idea is the following: should the needed direct read/write 1872 * test fail during runtime, we can pull in more data and redo 1873 * again, since implicitly, we invalidate previous checks here. 1874 * 1875 * Or, since we know how much we need to make read/writeable, 1876 * this can be done once at the program beginning for direct 1877 * access case. By this we overcome limitations of only current 1878 * headroom being accessible. 1879 */ 1880 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1881 } 1882 1883 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1884 .func = sk_skb_pull_data, 1885 .gpl_only = false, 1886 .ret_type = RET_INTEGER, 1887 .arg1_type = ARG_PTR_TO_CTX, 1888 .arg2_type = ARG_ANYTHING, 1889 }; 1890 1891 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1892 u64, from, u64, to, u64, flags) 1893 { 1894 __sum16 *ptr; 1895 1896 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1897 return -EINVAL; 1898 if (unlikely(offset > 0xffff || offset & 1)) 1899 return -EFAULT; 1900 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1901 return -EFAULT; 1902 1903 ptr = (__sum16 *)(skb->data + offset); 1904 switch (flags & BPF_F_HDR_FIELD_MASK) { 1905 case 0: 1906 if (unlikely(from != 0)) 1907 return -EINVAL; 1908 1909 csum_replace_by_diff(ptr, to); 1910 break; 1911 case 2: 1912 csum_replace2(ptr, from, to); 1913 break; 1914 case 4: 1915 csum_replace4(ptr, from, to); 1916 break; 1917 default: 1918 return -EINVAL; 1919 } 1920 1921 return 0; 1922 } 1923 1924 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1925 .func = bpf_l3_csum_replace, 1926 .gpl_only = false, 1927 .ret_type = RET_INTEGER, 1928 .arg1_type = ARG_PTR_TO_CTX, 1929 .arg2_type = ARG_ANYTHING, 1930 .arg3_type = ARG_ANYTHING, 1931 .arg4_type = ARG_ANYTHING, 1932 .arg5_type = ARG_ANYTHING, 1933 }; 1934 1935 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1936 u64, from, u64, to, u64, flags) 1937 { 1938 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1939 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1940 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1941 __sum16 *ptr; 1942 1943 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1944 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1945 return -EINVAL; 1946 if (unlikely(offset > 0xffff || offset & 1)) 1947 return -EFAULT; 1948 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1949 return -EFAULT; 1950 1951 ptr = (__sum16 *)(skb->data + offset); 1952 if (is_mmzero && !do_mforce && !*ptr) 1953 return 0; 1954 1955 switch (flags & BPF_F_HDR_FIELD_MASK) { 1956 case 0: 1957 if (unlikely(from != 0)) 1958 return -EINVAL; 1959 1960 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1961 break; 1962 case 2: 1963 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1964 break; 1965 case 4: 1966 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1967 break; 1968 default: 1969 return -EINVAL; 1970 } 1971 1972 if (is_mmzero && !*ptr) 1973 *ptr = CSUM_MANGLED_0; 1974 return 0; 1975 } 1976 1977 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 1978 .func = bpf_l4_csum_replace, 1979 .gpl_only = false, 1980 .ret_type = RET_INTEGER, 1981 .arg1_type = ARG_PTR_TO_CTX, 1982 .arg2_type = ARG_ANYTHING, 1983 .arg3_type = ARG_ANYTHING, 1984 .arg4_type = ARG_ANYTHING, 1985 .arg5_type = ARG_ANYTHING, 1986 }; 1987 1988 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 1989 __be32 *, to, u32, to_size, __wsum, seed) 1990 { 1991 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 1992 u32 diff_size = from_size + to_size; 1993 int i, j = 0; 1994 1995 /* This is quite flexible, some examples: 1996 * 1997 * from_size == 0, to_size > 0, seed := csum --> pushing data 1998 * from_size > 0, to_size == 0, seed := csum --> pulling data 1999 * from_size > 0, to_size > 0, seed := 0 --> diffing data 2000 * 2001 * Even for diffing, from_size and to_size don't need to be equal. 2002 */ 2003 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 2004 diff_size > sizeof(sp->diff))) 2005 return -EINVAL; 2006 2007 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 2008 sp->diff[j] = ~from[i]; 2009 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 2010 sp->diff[j] = to[i]; 2011 2012 return csum_partial(sp->diff, diff_size, seed); 2013 } 2014 2015 static const struct bpf_func_proto bpf_csum_diff_proto = { 2016 .func = bpf_csum_diff, 2017 .gpl_only = false, 2018 .pkt_access = true, 2019 .ret_type = RET_INTEGER, 2020 .arg1_type = ARG_PTR_TO_MEM_OR_NULL, 2021 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2022 .arg3_type = ARG_PTR_TO_MEM_OR_NULL, 2023 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2024 .arg5_type = ARG_ANYTHING, 2025 }; 2026 2027 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2028 { 2029 /* The interface is to be used in combination with bpf_csum_diff() 2030 * for direct packet writes. csum rotation for alignment as well 2031 * as emulating csum_sub() can be done from the eBPF program. 2032 */ 2033 if (skb->ip_summed == CHECKSUM_COMPLETE) 2034 return (skb->csum = csum_add(skb->csum, csum)); 2035 2036 return -ENOTSUPP; 2037 } 2038 2039 static const struct bpf_func_proto bpf_csum_update_proto = { 2040 .func = bpf_csum_update, 2041 .gpl_only = false, 2042 .ret_type = RET_INTEGER, 2043 .arg1_type = ARG_PTR_TO_CTX, 2044 .arg2_type = ARG_ANYTHING, 2045 }; 2046 2047 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) 2048 { 2049 /* The interface is to be used in combination with bpf_skb_adjust_room() 2050 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET 2051 * is passed as flags, for example. 2052 */ 2053 switch (level) { 2054 case BPF_CSUM_LEVEL_INC: 2055 __skb_incr_checksum_unnecessary(skb); 2056 break; 2057 case BPF_CSUM_LEVEL_DEC: 2058 __skb_decr_checksum_unnecessary(skb); 2059 break; 2060 case BPF_CSUM_LEVEL_RESET: 2061 __skb_reset_checksum_unnecessary(skb); 2062 break; 2063 case BPF_CSUM_LEVEL_QUERY: 2064 return skb->ip_summed == CHECKSUM_UNNECESSARY ? 2065 skb->csum_level : -EACCES; 2066 default: 2067 return -EINVAL; 2068 } 2069 2070 return 0; 2071 } 2072 2073 static const struct bpf_func_proto bpf_csum_level_proto = { 2074 .func = bpf_csum_level, 2075 .gpl_only = false, 2076 .ret_type = RET_INTEGER, 2077 .arg1_type = ARG_PTR_TO_CTX, 2078 .arg2_type = ARG_ANYTHING, 2079 }; 2080 2081 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2082 { 2083 return dev_forward_skb_nomtu(dev, skb); 2084 } 2085 2086 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2087 struct sk_buff *skb) 2088 { 2089 int ret = ____dev_forward_skb(dev, skb, false); 2090 2091 if (likely(!ret)) { 2092 skb->dev = dev; 2093 ret = netif_rx(skb); 2094 } 2095 2096 return ret; 2097 } 2098 2099 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2100 { 2101 int ret; 2102 2103 if (dev_xmit_recursion()) { 2104 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2105 kfree_skb(skb); 2106 return -ENETDOWN; 2107 } 2108 2109 skb->dev = dev; 2110 skb->tstamp = 0; 2111 2112 dev_xmit_recursion_inc(); 2113 ret = dev_queue_xmit(skb); 2114 dev_xmit_recursion_dec(); 2115 2116 return ret; 2117 } 2118 2119 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2120 u32 flags) 2121 { 2122 unsigned int mlen = skb_network_offset(skb); 2123 2124 if (mlen) { 2125 __skb_pull(skb, mlen); 2126 2127 /* At ingress, the mac header has already been pulled once. 2128 * At egress, skb_pospull_rcsum has to be done in case that 2129 * the skb is originated from ingress (i.e. a forwarded skb) 2130 * to ensure that rcsum starts at net header. 2131 */ 2132 if (!skb_at_tc_ingress(skb)) 2133 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2134 } 2135 skb_pop_mac_header(skb); 2136 skb_reset_mac_len(skb); 2137 return flags & BPF_F_INGRESS ? 2138 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2139 } 2140 2141 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2142 u32 flags) 2143 { 2144 /* Verify that a link layer header is carried */ 2145 if (unlikely(skb->mac_header >= skb->network_header)) { 2146 kfree_skb(skb); 2147 return -ERANGE; 2148 } 2149 2150 bpf_push_mac_rcsum(skb); 2151 return flags & BPF_F_INGRESS ? 2152 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2153 } 2154 2155 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2156 u32 flags) 2157 { 2158 if (dev_is_mac_header_xmit(dev)) 2159 return __bpf_redirect_common(skb, dev, flags); 2160 else 2161 return __bpf_redirect_no_mac(skb, dev, flags); 2162 } 2163 2164 #if IS_ENABLED(CONFIG_IPV6) 2165 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, 2166 struct net_device *dev, struct bpf_nh_params *nh) 2167 { 2168 u32 hh_len = LL_RESERVED_SPACE(dev); 2169 const struct in6_addr *nexthop; 2170 struct dst_entry *dst = NULL; 2171 struct neighbour *neigh; 2172 2173 if (dev_xmit_recursion()) { 2174 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2175 goto out_drop; 2176 } 2177 2178 skb->dev = dev; 2179 skb->tstamp = 0; 2180 2181 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2182 struct sk_buff *skb2; 2183 2184 skb2 = skb_realloc_headroom(skb, hh_len); 2185 if (unlikely(!skb2)) { 2186 kfree_skb(skb); 2187 return -ENOMEM; 2188 } 2189 if (skb->sk) 2190 skb_set_owner_w(skb2, skb->sk); 2191 consume_skb(skb); 2192 skb = skb2; 2193 } 2194 2195 rcu_read_lock_bh(); 2196 if (!nh) { 2197 dst = skb_dst(skb); 2198 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst), 2199 &ipv6_hdr(skb)->daddr); 2200 } else { 2201 nexthop = &nh->ipv6_nh; 2202 } 2203 neigh = ip_neigh_gw6(dev, nexthop); 2204 if (likely(!IS_ERR(neigh))) { 2205 int ret; 2206 2207 sock_confirm_neigh(skb, neigh); 2208 dev_xmit_recursion_inc(); 2209 ret = neigh_output(neigh, skb, false); 2210 dev_xmit_recursion_dec(); 2211 rcu_read_unlock_bh(); 2212 return ret; 2213 } 2214 rcu_read_unlock_bh(); 2215 if (dst) 2216 IP6_INC_STATS(dev_net(dst->dev), 2217 ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 2218 out_drop: 2219 kfree_skb(skb); 2220 return -ENETDOWN; 2221 } 2222 2223 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2224 struct bpf_nh_params *nh) 2225 { 2226 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2227 struct net *net = dev_net(dev); 2228 int err, ret = NET_XMIT_DROP; 2229 2230 if (!nh) { 2231 struct dst_entry *dst; 2232 struct flowi6 fl6 = { 2233 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2234 .flowi6_mark = skb->mark, 2235 .flowlabel = ip6_flowinfo(ip6h), 2236 .flowi6_oif = dev->ifindex, 2237 .flowi6_proto = ip6h->nexthdr, 2238 .daddr = ip6h->daddr, 2239 .saddr = ip6h->saddr, 2240 }; 2241 2242 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2243 if (IS_ERR(dst)) 2244 goto out_drop; 2245 2246 skb_dst_set(skb, dst); 2247 } else if (nh->nh_family != AF_INET6) { 2248 goto out_drop; 2249 } 2250 2251 err = bpf_out_neigh_v6(net, skb, dev, nh); 2252 if (unlikely(net_xmit_eval(err))) 2253 dev->stats.tx_errors++; 2254 else 2255 ret = NET_XMIT_SUCCESS; 2256 goto out_xmit; 2257 out_drop: 2258 dev->stats.tx_errors++; 2259 kfree_skb(skb); 2260 out_xmit: 2261 return ret; 2262 } 2263 #else 2264 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2265 struct bpf_nh_params *nh) 2266 { 2267 kfree_skb(skb); 2268 return NET_XMIT_DROP; 2269 } 2270 #endif /* CONFIG_IPV6 */ 2271 2272 #if IS_ENABLED(CONFIG_INET) 2273 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, 2274 struct net_device *dev, struct bpf_nh_params *nh) 2275 { 2276 u32 hh_len = LL_RESERVED_SPACE(dev); 2277 struct neighbour *neigh; 2278 bool is_v6gw = false; 2279 2280 if (dev_xmit_recursion()) { 2281 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2282 goto out_drop; 2283 } 2284 2285 skb->dev = dev; 2286 skb->tstamp = 0; 2287 2288 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2289 struct sk_buff *skb2; 2290 2291 skb2 = skb_realloc_headroom(skb, hh_len); 2292 if (unlikely(!skb2)) { 2293 kfree_skb(skb); 2294 return -ENOMEM; 2295 } 2296 if (skb->sk) 2297 skb_set_owner_w(skb2, skb->sk); 2298 consume_skb(skb); 2299 skb = skb2; 2300 } 2301 2302 rcu_read_lock_bh(); 2303 if (!nh) { 2304 struct dst_entry *dst = skb_dst(skb); 2305 struct rtable *rt = container_of(dst, struct rtable, dst); 2306 2307 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); 2308 } else if (nh->nh_family == AF_INET6) { 2309 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh); 2310 is_v6gw = true; 2311 } else if (nh->nh_family == AF_INET) { 2312 neigh = ip_neigh_gw4(dev, nh->ipv4_nh); 2313 } else { 2314 rcu_read_unlock_bh(); 2315 goto out_drop; 2316 } 2317 2318 if (likely(!IS_ERR(neigh))) { 2319 int ret; 2320 2321 sock_confirm_neigh(skb, neigh); 2322 dev_xmit_recursion_inc(); 2323 ret = neigh_output(neigh, skb, is_v6gw); 2324 dev_xmit_recursion_dec(); 2325 rcu_read_unlock_bh(); 2326 return ret; 2327 } 2328 rcu_read_unlock_bh(); 2329 out_drop: 2330 kfree_skb(skb); 2331 return -ENETDOWN; 2332 } 2333 2334 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2335 struct bpf_nh_params *nh) 2336 { 2337 const struct iphdr *ip4h = ip_hdr(skb); 2338 struct net *net = dev_net(dev); 2339 int err, ret = NET_XMIT_DROP; 2340 2341 if (!nh) { 2342 struct flowi4 fl4 = { 2343 .flowi4_flags = FLOWI_FLAG_ANYSRC, 2344 .flowi4_mark = skb->mark, 2345 .flowi4_tos = RT_TOS(ip4h->tos), 2346 .flowi4_oif = dev->ifindex, 2347 .flowi4_proto = ip4h->protocol, 2348 .daddr = ip4h->daddr, 2349 .saddr = ip4h->saddr, 2350 }; 2351 struct rtable *rt; 2352 2353 rt = ip_route_output_flow(net, &fl4, NULL); 2354 if (IS_ERR(rt)) 2355 goto out_drop; 2356 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 2357 ip_rt_put(rt); 2358 goto out_drop; 2359 } 2360 2361 skb_dst_set(skb, &rt->dst); 2362 } 2363 2364 err = bpf_out_neigh_v4(net, skb, dev, nh); 2365 if (unlikely(net_xmit_eval(err))) 2366 dev->stats.tx_errors++; 2367 else 2368 ret = NET_XMIT_SUCCESS; 2369 goto out_xmit; 2370 out_drop: 2371 dev->stats.tx_errors++; 2372 kfree_skb(skb); 2373 out_xmit: 2374 return ret; 2375 } 2376 #else 2377 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2378 struct bpf_nh_params *nh) 2379 { 2380 kfree_skb(skb); 2381 return NET_XMIT_DROP; 2382 } 2383 #endif /* CONFIG_INET */ 2384 2385 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev, 2386 struct bpf_nh_params *nh) 2387 { 2388 struct ethhdr *ethh = eth_hdr(skb); 2389 2390 if (unlikely(skb->mac_header >= skb->network_header)) 2391 goto out; 2392 bpf_push_mac_rcsum(skb); 2393 if (is_multicast_ether_addr(ethh->h_dest)) 2394 goto out; 2395 2396 skb_pull(skb, sizeof(*ethh)); 2397 skb_unset_mac_header(skb); 2398 skb_reset_network_header(skb); 2399 2400 if (skb->protocol == htons(ETH_P_IP)) 2401 return __bpf_redirect_neigh_v4(skb, dev, nh); 2402 else if (skb->protocol == htons(ETH_P_IPV6)) 2403 return __bpf_redirect_neigh_v6(skb, dev, nh); 2404 out: 2405 kfree_skb(skb); 2406 return -ENOTSUPP; 2407 } 2408 2409 /* Internal, non-exposed redirect flags. */ 2410 enum { 2411 BPF_F_NEIGH = (1ULL << 1), 2412 BPF_F_PEER = (1ULL << 2), 2413 BPF_F_NEXTHOP = (1ULL << 3), 2414 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP) 2415 }; 2416 2417 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2418 { 2419 struct net_device *dev; 2420 struct sk_buff *clone; 2421 int ret; 2422 2423 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2424 return -EINVAL; 2425 2426 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2427 if (unlikely(!dev)) 2428 return -EINVAL; 2429 2430 clone = skb_clone(skb, GFP_ATOMIC); 2431 if (unlikely(!clone)) 2432 return -ENOMEM; 2433 2434 /* For direct write, we need to keep the invariant that the skbs 2435 * we're dealing with need to be uncloned. Should uncloning fail 2436 * here, we need to free the just generated clone to unclone once 2437 * again. 2438 */ 2439 ret = bpf_try_make_head_writable(skb); 2440 if (unlikely(ret)) { 2441 kfree_skb(clone); 2442 return -ENOMEM; 2443 } 2444 2445 return __bpf_redirect(clone, dev, flags); 2446 } 2447 2448 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2449 .func = bpf_clone_redirect, 2450 .gpl_only = false, 2451 .ret_type = RET_INTEGER, 2452 .arg1_type = ARG_PTR_TO_CTX, 2453 .arg2_type = ARG_ANYTHING, 2454 .arg3_type = ARG_ANYTHING, 2455 }; 2456 2457 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2458 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2459 2460 int skb_do_redirect(struct sk_buff *skb) 2461 { 2462 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2463 struct net *net = dev_net(skb->dev); 2464 struct net_device *dev; 2465 u32 flags = ri->flags; 2466 2467 dev = dev_get_by_index_rcu(net, ri->tgt_index); 2468 ri->tgt_index = 0; 2469 ri->flags = 0; 2470 if (unlikely(!dev)) 2471 goto out_drop; 2472 if (flags & BPF_F_PEER) { 2473 const struct net_device_ops *ops = dev->netdev_ops; 2474 2475 if (unlikely(!ops->ndo_get_peer_dev || 2476 !skb_at_tc_ingress(skb))) 2477 goto out_drop; 2478 dev = ops->ndo_get_peer_dev(dev); 2479 if (unlikely(!dev || 2480 !(dev->flags & IFF_UP) || 2481 net_eq(net, dev_net(dev)))) 2482 goto out_drop; 2483 skb->dev = dev; 2484 return -EAGAIN; 2485 } 2486 return flags & BPF_F_NEIGH ? 2487 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ? 2488 &ri->nh : NULL) : 2489 __bpf_redirect(skb, dev, flags); 2490 out_drop: 2491 kfree_skb(skb); 2492 return -EINVAL; 2493 } 2494 2495 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2496 { 2497 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2498 2499 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2500 return TC_ACT_SHOT; 2501 2502 ri->flags = flags; 2503 ri->tgt_index = ifindex; 2504 2505 return TC_ACT_REDIRECT; 2506 } 2507 2508 static const struct bpf_func_proto bpf_redirect_proto = { 2509 .func = bpf_redirect, 2510 .gpl_only = false, 2511 .ret_type = RET_INTEGER, 2512 .arg1_type = ARG_ANYTHING, 2513 .arg2_type = ARG_ANYTHING, 2514 }; 2515 2516 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags) 2517 { 2518 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2519 2520 if (unlikely(flags)) 2521 return TC_ACT_SHOT; 2522 2523 ri->flags = BPF_F_PEER; 2524 ri->tgt_index = ifindex; 2525 2526 return TC_ACT_REDIRECT; 2527 } 2528 2529 static const struct bpf_func_proto bpf_redirect_peer_proto = { 2530 .func = bpf_redirect_peer, 2531 .gpl_only = false, 2532 .ret_type = RET_INTEGER, 2533 .arg1_type = ARG_ANYTHING, 2534 .arg2_type = ARG_ANYTHING, 2535 }; 2536 2537 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params, 2538 int, plen, u64, flags) 2539 { 2540 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2541 2542 if (unlikely((plen && plen < sizeof(*params)) || flags)) 2543 return TC_ACT_SHOT; 2544 2545 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0); 2546 ri->tgt_index = ifindex; 2547 2548 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params)); 2549 if (plen) 2550 memcpy(&ri->nh, params, sizeof(ri->nh)); 2551 2552 return TC_ACT_REDIRECT; 2553 } 2554 2555 static const struct bpf_func_proto bpf_redirect_neigh_proto = { 2556 .func = bpf_redirect_neigh, 2557 .gpl_only = false, 2558 .ret_type = RET_INTEGER, 2559 .arg1_type = ARG_ANYTHING, 2560 .arg2_type = ARG_PTR_TO_MEM_OR_NULL, 2561 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 2562 .arg4_type = ARG_ANYTHING, 2563 }; 2564 2565 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2566 { 2567 msg->apply_bytes = bytes; 2568 return 0; 2569 } 2570 2571 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2572 .func = bpf_msg_apply_bytes, 2573 .gpl_only = false, 2574 .ret_type = RET_INTEGER, 2575 .arg1_type = ARG_PTR_TO_CTX, 2576 .arg2_type = ARG_ANYTHING, 2577 }; 2578 2579 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2580 { 2581 msg->cork_bytes = bytes; 2582 return 0; 2583 } 2584 2585 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2586 .func = bpf_msg_cork_bytes, 2587 .gpl_only = false, 2588 .ret_type = RET_INTEGER, 2589 .arg1_type = ARG_PTR_TO_CTX, 2590 .arg2_type = ARG_ANYTHING, 2591 }; 2592 2593 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2594 u32, end, u64, flags) 2595 { 2596 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2597 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2598 struct scatterlist *sge; 2599 u8 *raw, *to, *from; 2600 struct page *page; 2601 2602 if (unlikely(flags || end <= start)) 2603 return -EINVAL; 2604 2605 /* First find the starting scatterlist element */ 2606 i = msg->sg.start; 2607 do { 2608 offset += len; 2609 len = sk_msg_elem(msg, i)->length; 2610 if (start < offset + len) 2611 break; 2612 sk_msg_iter_var_next(i); 2613 } while (i != msg->sg.end); 2614 2615 if (unlikely(start >= offset + len)) 2616 return -EINVAL; 2617 2618 first_sge = i; 2619 /* The start may point into the sg element so we need to also 2620 * account for the headroom. 2621 */ 2622 bytes_sg_total = start - offset + bytes; 2623 if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len) 2624 goto out; 2625 2626 /* At this point we need to linearize multiple scatterlist 2627 * elements or a single shared page. Either way we need to 2628 * copy into a linear buffer exclusively owned by BPF. Then 2629 * place the buffer in the scatterlist and fixup the original 2630 * entries by removing the entries now in the linear buffer 2631 * and shifting the remaining entries. For now we do not try 2632 * to copy partial entries to avoid complexity of running out 2633 * of sg_entry slots. The downside is reading a single byte 2634 * will copy the entire sg entry. 2635 */ 2636 do { 2637 copy += sk_msg_elem(msg, i)->length; 2638 sk_msg_iter_var_next(i); 2639 if (bytes_sg_total <= copy) 2640 break; 2641 } while (i != msg->sg.end); 2642 last_sge = i; 2643 2644 if (unlikely(bytes_sg_total > copy)) 2645 return -EINVAL; 2646 2647 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2648 get_order(copy)); 2649 if (unlikely(!page)) 2650 return -ENOMEM; 2651 2652 raw = page_address(page); 2653 i = first_sge; 2654 do { 2655 sge = sk_msg_elem(msg, i); 2656 from = sg_virt(sge); 2657 len = sge->length; 2658 to = raw + poffset; 2659 2660 memcpy(to, from, len); 2661 poffset += len; 2662 sge->length = 0; 2663 put_page(sg_page(sge)); 2664 2665 sk_msg_iter_var_next(i); 2666 } while (i != last_sge); 2667 2668 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2669 2670 /* To repair sg ring we need to shift entries. If we only 2671 * had a single entry though we can just replace it and 2672 * be done. Otherwise walk the ring and shift the entries. 2673 */ 2674 WARN_ON_ONCE(last_sge == first_sge); 2675 shift = last_sge > first_sge ? 2676 last_sge - first_sge - 1 : 2677 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2678 if (!shift) 2679 goto out; 2680 2681 i = first_sge; 2682 sk_msg_iter_var_next(i); 2683 do { 2684 u32 move_from; 2685 2686 if (i + shift >= NR_MSG_FRAG_IDS) 2687 move_from = i + shift - NR_MSG_FRAG_IDS; 2688 else 2689 move_from = i + shift; 2690 if (move_from == msg->sg.end) 2691 break; 2692 2693 msg->sg.data[i] = msg->sg.data[move_from]; 2694 msg->sg.data[move_from].length = 0; 2695 msg->sg.data[move_from].page_link = 0; 2696 msg->sg.data[move_from].offset = 0; 2697 sk_msg_iter_var_next(i); 2698 } while (1); 2699 2700 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2701 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2702 msg->sg.end - shift; 2703 out: 2704 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2705 msg->data_end = msg->data + bytes; 2706 return 0; 2707 } 2708 2709 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2710 .func = bpf_msg_pull_data, 2711 .gpl_only = false, 2712 .ret_type = RET_INTEGER, 2713 .arg1_type = ARG_PTR_TO_CTX, 2714 .arg2_type = ARG_ANYTHING, 2715 .arg3_type = ARG_ANYTHING, 2716 .arg4_type = ARG_ANYTHING, 2717 }; 2718 2719 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2720 u32, len, u64, flags) 2721 { 2722 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2723 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2724 u8 *raw, *to, *from; 2725 struct page *page; 2726 2727 if (unlikely(flags)) 2728 return -EINVAL; 2729 2730 /* First find the starting scatterlist element */ 2731 i = msg->sg.start; 2732 do { 2733 offset += l; 2734 l = sk_msg_elem(msg, i)->length; 2735 2736 if (start < offset + l) 2737 break; 2738 sk_msg_iter_var_next(i); 2739 } while (i != msg->sg.end); 2740 2741 if (start >= offset + l) 2742 return -EINVAL; 2743 2744 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2745 2746 /* If no space available will fallback to copy, we need at 2747 * least one scatterlist elem available to push data into 2748 * when start aligns to the beginning of an element or two 2749 * when it falls inside an element. We handle the start equals 2750 * offset case because its the common case for inserting a 2751 * header. 2752 */ 2753 if (!space || (space == 1 && start != offset)) 2754 copy = msg->sg.data[i].length; 2755 2756 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2757 get_order(copy + len)); 2758 if (unlikely(!page)) 2759 return -ENOMEM; 2760 2761 if (copy) { 2762 int front, back; 2763 2764 raw = page_address(page); 2765 2766 psge = sk_msg_elem(msg, i); 2767 front = start - offset; 2768 back = psge->length - front; 2769 from = sg_virt(psge); 2770 2771 if (front) 2772 memcpy(raw, from, front); 2773 2774 if (back) { 2775 from += front; 2776 to = raw + front + len; 2777 2778 memcpy(to, from, back); 2779 } 2780 2781 put_page(sg_page(psge)); 2782 } else if (start - offset) { 2783 psge = sk_msg_elem(msg, i); 2784 rsge = sk_msg_elem_cpy(msg, i); 2785 2786 psge->length = start - offset; 2787 rsge.length -= psge->length; 2788 rsge.offset += start; 2789 2790 sk_msg_iter_var_next(i); 2791 sg_unmark_end(psge); 2792 sg_unmark_end(&rsge); 2793 sk_msg_iter_next(msg, end); 2794 } 2795 2796 /* Slot(s) to place newly allocated data */ 2797 new = i; 2798 2799 /* Shift one or two slots as needed */ 2800 if (!copy) { 2801 sge = sk_msg_elem_cpy(msg, i); 2802 2803 sk_msg_iter_var_next(i); 2804 sg_unmark_end(&sge); 2805 sk_msg_iter_next(msg, end); 2806 2807 nsge = sk_msg_elem_cpy(msg, i); 2808 if (rsge.length) { 2809 sk_msg_iter_var_next(i); 2810 nnsge = sk_msg_elem_cpy(msg, i); 2811 } 2812 2813 while (i != msg->sg.end) { 2814 msg->sg.data[i] = sge; 2815 sge = nsge; 2816 sk_msg_iter_var_next(i); 2817 if (rsge.length) { 2818 nsge = nnsge; 2819 nnsge = sk_msg_elem_cpy(msg, i); 2820 } else { 2821 nsge = sk_msg_elem_cpy(msg, i); 2822 } 2823 } 2824 } 2825 2826 /* Place newly allocated data buffer */ 2827 sk_mem_charge(msg->sk, len); 2828 msg->sg.size += len; 2829 __clear_bit(new, &msg->sg.copy); 2830 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2831 if (rsge.length) { 2832 get_page(sg_page(&rsge)); 2833 sk_msg_iter_var_next(new); 2834 msg->sg.data[new] = rsge; 2835 } 2836 2837 sk_msg_compute_data_pointers(msg); 2838 return 0; 2839 } 2840 2841 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2842 .func = bpf_msg_push_data, 2843 .gpl_only = false, 2844 .ret_type = RET_INTEGER, 2845 .arg1_type = ARG_PTR_TO_CTX, 2846 .arg2_type = ARG_ANYTHING, 2847 .arg3_type = ARG_ANYTHING, 2848 .arg4_type = ARG_ANYTHING, 2849 }; 2850 2851 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2852 { 2853 int prev; 2854 2855 do { 2856 prev = i; 2857 sk_msg_iter_var_next(i); 2858 msg->sg.data[prev] = msg->sg.data[i]; 2859 } while (i != msg->sg.end); 2860 2861 sk_msg_iter_prev(msg, end); 2862 } 2863 2864 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2865 { 2866 struct scatterlist tmp, sge; 2867 2868 sk_msg_iter_next(msg, end); 2869 sge = sk_msg_elem_cpy(msg, i); 2870 sk_msg_iter_var_next(i); 2871 tmp = sk_msg_elem_cpy(msg, i); 2872 2873 while (i != msg->sg.end) { 2874 msg->sg.data[i] = sge; 2875 sk_msg_iter_var_next(i); 2876 sge = tmp; 2877 tmp = sk_msg_elem_cpy(msg, i); 2878 } 2879 } 2880 2881 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2882 u32, len, u64, flags) 2883 { 2884 u32 i = 0, l = 0, space, offset = 0; 2885 u64 last = start + len; 2886 int pop; 2887 2888 if (unlikely(flags)) 2889 return -EINVAL; 2890 2891 /* First find the starting scatterlist element */ 2892 i = msg->sg.start; 2893 do { 2894 offset += l; 2895 l = sk_msg_elem(msg, i)->length; 2896 2897 if (start < offset + l) 2898 break; 2899 sk_msg_iter_var_next(i); 2900 } while (i != msg->sg.end); 2901 2902 /* Bounds checks: start and pop must be inside message */ 2903 if (start >= offset + l || last >= msg->sg.size) 2904 return -EINVAL; 2905 2906 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2907 2908 pop = len; 2909 /* --------------| offset 2910 * -| start |-------- len -------| 2911 * 2912 * |----- a ----|-------- pop -------|----- b ----| 2913 * |______________________________________________| length 2914 * 2915 * 2916 * a: region at front of scatter element to save 2917 * b: region at back of scatter element to save when length > A + pop 2918 * pop: region to pop from element, same as input 'pop' here will be 2919 * decremented below per iteration. 2920 * 2921 * Two top-level cases to handle when start != offset, first B is non 2922 * zero and second B is zero corresponding to when a pop includes more 2923 * than one element. 2924 * 2925 * Then if B is non-zero AND there is no space allocate space and 2926 * compact A, B regions into page. If there is space shift ring to 2927 * the rigth free'ing the next element in ring to place B, leaving 2928 * A untouched except to reduce length. 2929 */ 2930 if (start != offset) { 2931 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2932 int a = start; 2933 int b = sge->length - pop - a; 2934 2935 sk_msg_iter_var_next(i); 2936 2937 if (pop < sge->length - a) { 2938 if (space) { 2939 sge->length = a; 2940 sk_msg_shift_right(msg, i); 2941 nsge = sk_msg_elem(msg, i); 2942 get_page(sg_page(sge)); 2943 sg_set_page(nsge, 2944 sg_page(sge), 2945 b, sge->offset + pop + a); 2946 } else { 2947 struct page *page, *orig; 2948 u8 *to, *from; 2949 2950 page = alloc_pages(__GFP_NOWARN | 2951 __GFP_COMP | GFP_ATOMIC, 2952 get_order(a + b)); 2953 if (unlikely(!page)) 2954 return -ENOMEM; 2955 2956 sge->length = a; 2957 orig = sg_page(sge); 2958 from = sg_virt(sge); 2959 to = page_address(page); 2960 memcpy(to, from, a); 2961 memcpy(to + a, from + a + pop, b); 2962 sg_set_page(sge, page, a + b, 0); 2963 put_page(orig); 2964 } 2965 pop = 0; 2966 } else if (pop >= sge->length - a) { 2967 pop -= (sge->length - a); 2968 sge->length = a; 2969 } 2970 } 2971 2972 /* From above the current layout _must_ be as follows, 2973 * 2974 * -| offset 2975 * -| start 2976 * 2977 * |---- pop ---|---------------- b ------------| 2978 * |____________________________________________| length 2979 * 2980 * Offset and start of the current msg elem are equal because in the 2981 * previous case we handled offset != start and either consumed the 2982 * entire element and advanced to the next element OR pop == 0. 2983 * 2984 * Two cases to handle here are first pop is less than the length 2985 * leaving some remainder b above. Simply adjust the element's layout 2986 * in this case. Or pop >= length of the element so that b = 0. In this 2987 * case advance to next element decrementing pop. 2988 */ 2989 while (pop) { 2990 struct scatterlist *sge = sk_msg_elem(msg, i); 2991 2992 if (pop < sge->length) { 2993 sge->length -= pop; 2994 sge->offset += pop; 2995 pop = 0; 2996 } else { 2997 pop -= sge->length; 2998 sk_msg_shift_left(msg, i); 2999 } 3000 sk_msg_iter_var_next(i); 3001 } 3002 3003 sk_mem_uncharge(msg->sk, len - pop); 3004 msg->sg.size -= (len - pop); 3005 sk_msg_compute_data_pointers(msg); 3006 return 0; 3007 } 3008 3009 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 3010 .func = bpf_msg_pop_data, 3011 .gpl_only = false, 3012 .ret_type = RET_INTEGER, 3013 .arg1_type = ARG_PTR_TO_CTX, 3014 .arg2_type = ARG_ANYTHING, 3015 .arg3_type = ARG_ANYTHING, 3016 .arg4_type = ARG_ANYTHING, 3017 }; 3018 3019 #ifdef CONFIG_CGROUP_NET_CLASSID 3020 BPF_CALL_0(bpf_get_cgroup_classid_curr) 3021 { 3022 return __task_get_classid(current); 3023 } 3024 3025 static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { 3026 .func = bpf_get_cgroup_classid_curr, 3027 .gpl_only = false, 3028 .ret_type = RET_INTEGER, 3029 }; 3030 3031 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb) 3032 { 3033 struct sock *sk = skb_to_full_sk(skb); 3034 3035 if (!sk || !sk_fullsock(sk)) 3036 return 0; 3037 3038 return sock_cgroup_classid(&sk->sk_cgrp_data); 3039 } 3040 3041 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = { 3042 .func = bpf_skb_cgroup_classid, 3043 .gpl_only = false, 3044 .ret_type = RET_INTEGER, 3045 .arg1_type = ARG_PTR_TO_CTX, 3046 }; 3047 #endif 3048 3049 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 3050 { 3051 return task_get_classid(skb); 3052 } 3053 3054 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 3055 .func = bpf_get_cgroup_classid, 3056 .gpl_only = false, 3057 .ret_type = RET_INTEGER, 3058 .arg1_type = ARG_PTR_TO_CTX, 3059 }; 3060 3061 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 3062 { 3063 return dst_tclassid(skb); 3064 } 3065 3066 static const struct bpf_func_proto bpf_get_route_realm_proto = { 3067 .func = bpf_get_route_realm, 3068 .gpl_only = false, 3069 .ret_type = RET_INTEGER, 3070 .arg1_type = ARG_PTR_TO_CTX, 3071 }; 3072 3073 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 3074 { 3075 /* If skb_clear_hash() was called due to mangling, we can 3076 * trigger SW recalculation here. Later access to hash 3077 * can then use the inline skb->hash via context directly 3078 * instead of calling this helper again. 3079 */ 3080 return skb_get_hash(skb); 3081 } 3082 3083 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 3084 .func = bpf_get_hash_recalc, 3085 .gpl_only = false, 3086 .ret_type = RET_INTEGER, 3087 .arg1_type = ARG_PTR_TO_CTX, 3088 }; 3089 3090 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 3091 { 3092 /* After all direct packet write, this can be used once for 3093 * triggering a lazy recalc on next skb_get_hash() invocation. 3094 */ 3095 skb_clear_hash(skb); 3096 return 0; 3097 } 3098 3099 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 3100 .func = bpf_set_hash_invalid, 3101 .gpl_only = false, 3102 .ret_type = RET_INTEGER, 3103 .arg1_type = ARG_PTR_TO_CTX, 3104 }; 3105 3106 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 3107 { 3108 /* Set user specified hash as L4(+), so that it gets returned 3109 * on skb_get_hash() call unless BPF prog later on triggers a 3110 * skb_clear_hash(). 3111 */ 3112 __skb_set_sw_hash(skb, hash, true); 3113 return 0; 3114 } 3115 3116 static const struct bpf_func_proto bpf_set_hash_proto = { 3117 .func = bpf_set_hash, 3118 .gpl_only = false, 3119 .ret_type = RET_INTEGER, 3120 .arg1_type = ARG_PTR_TO_CTX, 3121 .arg2_type = ARG_ANYTHING, 3122 }; 3123 3124 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 3125 u16, vlan_tci) 3126 { 3127 int ret; 3128 3129 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 3130 vlan_proto != htons(ETH_P_8021AD))) 3131 vlan_proto = htons(ETH_P_8021Q); 3132 3133 bpf_push_mac_rcsum(skb); 3134 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 3135 bpf_pull_mac_rcsum(skb); 3136 3137 bpf_compute_data_pointers(skb); 3138 return ret; 3139 } 3140 3141 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 3142 .func = bpf_skb_vlan_push, 3143 .gpl_only = false, 3144 .ret_type = RET_INTEGER, 3145 .arg1_type = ARG_PTR_TO_CTX, 3146 .arg2_type = ARG_ANYTHING, 3147 .arg3_type = ARG_ANYTHING, 3148 }; 3149 3150 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 3151 { 3152 int ret; 3153 3154 bpf_push_mac_rcsum(skb); 3155 ret = skb_vlan_pop(skb); 3156 bpf_pull_mac_rcsum(skb); 3157 3158 bpf_compute_data_pointers(skb); 3159 return ret; 3160 } 3161 3162 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 3163 .func = bpf_skb_vlan_pop, 3164 .gpl_only = false, 3165 .ret_type = RET_INTEGER, 3166 .arg1_type = ARG_PTR_TO_CTX, 3167 }; 3168 3169 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 3170 { 3171 /* Caller already did skb_cow() with len as headroom, 3172 * so no need to do it here. 3173 */ 3174 skb_push(skb, len); 3175 memmove(skb->data, skb->data + len, off); 3176 memset(skb->data + off, 0, len); 3177 3178 /* No skb_postpush_rcsum(skb, skb->data + off, len) 3179 * needed here as it does not change the skb->csum 3180 * result for checksum complete when summing over 3181 * zeroed blocks. 3182 */ 3183 return 0; 3184 } 3185 3186 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 3187 { 3188 /* skb_ensure_writable() is not needed here, as we're 3189 * already working on an uncloned skb. 3190 */ 3191 if (unlikely(!pskb_may_pull(skb, off + len))) 3192 return -ENOMEM; 3193 3194 skb_postpull_rcsum(skb, skb->data + off, len); 3195 memmove(skb->data + len, skb->data, off); 3196 __skb_pull(skb, len); 3197 3198 return 0; 3199 } 3200 3201 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 3202 { 3203 bool trans_same = skb->transport_header == skb->network_header; 3204 int ret; 3205 3206 /* There's no need for __skb_push()/__skb_pull() pair to 3207 * get to the start of the mac header as we're guaranteed 3208 * to always start from here under eBPF. 3209 */ 3210 ret = bpf_skb_generic_push(skb, off, len); 3211 if (likely(!ret)) { 3212 skb->mac_header -= len; 3213 skb->network_header -= len; 3214 if (trans_same) 3215 skb->transport_header = skb->network_header; 3216 } 3217 3218 return ret; 3219 } 3220 3221 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 3222 { 3223 bool trans_same = skb->transport_header == skb->network_header; 3224 int ret; 3225 3226 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 3227 ret = bpf_skb_generic_pop(skb, off, len); 3228 if (likely(!ret)) { 3229 skb->mac_header += len; 3230 skb->network_header += len; 3231 if (trans_same) 3232 skb->transport_header = skb->network_header; 3233 } 3234 3235 return ret; 3236 } 3237 3238 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 3239 { 3240 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3241 u32 off = skb_mac_header_len(skb); 3242 int ret; 3243 3244 ret = skb_cow(skb, len_diff); 3245 if (unlikely(ret < 0)) 3246 return ret; 3247 3248 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3249 if (unlikely(ret < 0)) 3250 return ret; 3251 3252 if (skb_is_gso(skb)) { 3253 struct skb_shared_info *shinfo = skb_shinfo(skb); 3254 3255 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */ 3256 if (shinfo->gso_type & SKB_GSO_TCPV4) { 3257 shinfo->gso_type &= ~SKB_GSO_TCPV4; 3258 shinfo->gso_type |= SKB_GSO_TCPV6; 3259 } 3260 } 3261 3262 skb->protocol = htons(ETH_P_IPV6); 3263 skb_clear_hash(skb); 3264 3265 return 0; 3266 } 3267 3268 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 3269 { 3270 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3271 u32 off = skb_mac_header_len(skb); 3272 int ret; 3273 3274 ret = skb_unclone(skb, GFP_ATOMIC); 3275 if (unlikely(ret < 0)) 3276 return ret; 3277 3278 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3279 if (unlikely(ret < 0)) 3280 return ret; 3281 3282 if (skb_is_gso(skb)) { 3283 struct skb_shared_info *shinfo = skb_shinfo(skb); 3284 3285 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */ 3286 if (shinfo->gso_type & SKB_GSO_TCPV6) { 3287 shinfo->gso_type &= ~SKB_GSO_TCPV6; 3288 shinfo->gso_type |= SKB_GSO_TCPV4; 3289 } 3290 } 3291 3292 skb->protocol = htons(ETH_P_IP); 3293 skb_clear_hash(skb); 3294 3295 return 0; 3296 } 3297 3298 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 3299 { 3300 __be16 from_proto = skb->protocol; 3301 3302 if (from_proto == htons(ETH_P_IP) && 3303 to_proto == htons(ETH_P_IPV6)) 3304 return bpf_skb_proto_4_to_6(skb); 3305 3306 if (from_proto == htons(ETH_P_IPV6) && 3307 to_proto == htons(ETH_P_IP)) 3308 return bpf_skb_proto_6_to_4(skb); 3309 3310 return -ENOTSUPP; 3311 } 3312 3313 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 3314 u64, flags) 3315 { 3316 int ret; 3317 3318 if (unlikely(flags)) 3319 return -EINVAL; 3320 3321 /* General idea is that this helper does the basic groundwork 3322 * needed for changing the protocol, and eBPF program fills the 3323 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 3324 * and other helpers, rather than passing a raw buffer here. 3325 * 3326 * The rationale is to keep this minimal and without a need to 3327 * deal with raw packet data. F.e. even if we would pass buffers 3328 * here, the program still needs to call the bpf_lX_csum_replace() 3329 * helpers anyway. Plus, this way we keep also separation of 3330 * concerns, since f.e. bpf_skb_store_bytes() should only take 3331 * care of stores. 3332 * 3333 * Currently, additional options and extension header space are 3334 * not supported, but flags register is reserved so we can adapt 3335 * that. For offloads, we mark packet as dodgy, so that headers 3336 * need to be verified first. 3337 */ 3338 ret = bpf_skb_proto_xlat(skb, proto); 3339 bpf_compute_data_pointers(skb); 3340 return ret; 3341 } 3342 3343 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 3344 .func = bpf_skb_change_proto, 3345 .gpl_only = false, 3346 .ret_type = RET_INTEGER, 3347 .arg1_type = ARG_PTR_TO_CTX, 3348 .arg2_type = ARG_ANYTHING, 3349 .arg3_type = ARG_ANYTHING, 3350 }; 3351 3352 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 3353 { 3354 /* We only allow a restricted subset to be changed for now. */ 3355 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 3356 !skb_pkt_type_ok(pkt_type))) 3357 return -EINVAL; 3358 3359 skb->pkt_type = pkt_type; 3360 return 0; 3361 } 3362 3363 static const struct bpf_func_proto bpf_skb_change_type_proto = { 3364 .func = bpf_skb_change_type, 3365 .gpl_only = false, 3366 .ret_type = RET_INTEGER, 3367 .arg1_type = ARG_PTR_TO_CTX, 3368 .arg2_type = ARG_ANYTHING, 3369 }; 3370 3371 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 3372 { 3373 switch (skb->protocol) { 3374 case htons(ETH_P_IP): 3375 return sizeof(struct iphdr); 3376 case htons(ETH_P_IPV6): 3377 return sizeof(struct ipv6hdr); 3378 default: 3379 return ~0U; 3380 } 3381 } 3382 3383 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3384 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3385 3386 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3387 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3388 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3389 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3390 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \ 3391 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3392 BPF_ADJ_ROOM_ENCAP_L2_MASK)) 3393 3394 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3395 u64 flags) 3396 { 3397 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3398 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3399 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3400 unsigned int gso_type = SKB_GSO_DODGY; 3401 int ret; 3402 3403 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3404 /* udp gso_size delineates datagrams, only allow if fixed */ 3405 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3406 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3407 return -ENOTSUPP; 3408 } 3409 3410 ret = skb_cow_head(skb, len_diff); 3411 if (unlikely(ret < 0)) 3412 return ret; 3413 3414 if (encap) { 3415 if (skb->protocol != htons(ETH_P_IP) && 3416 skb->protocol != htons(ETH_P_IPV6)) 3417 return -ENOTSUPP; 3418 3419 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3420 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3421 return -EINVAL; 3422 3423 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3424 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3425 return -EINVAL; 3426 3427 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH && 3428 inner_mac_len < ETH_HLEN) 3429 return -EINVAL; 3430 3431 if (skb->encapsulation) 3432 return -EALREADY; 3433 3434 mac_len = skb->network_header - skb->mac_header; 3435 inner_net = skb->network_header; 3436 if (inner_mac_len > len_diff) 3437 return -EINVAL; 3438 inner_trans = skb->transport_header; 3439 } 3440 3441 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3442 if (unlikely(ret < 0)) 3443 return ret; 3444 3445 if (encap) { 3446 skb->inner_mac_header = inner_net - inner_mac_len; 3447 skb->inner_network_header = inner_net; 3448 skb->inner_transport_header = inner_trans; 3449 3450 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH) 3451 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 3452 else 3453 skb_set_inner_protocol(skb, skb->protocol); 3454 3455 skb->encapsulation = 1; 3456 skb_set_network_header(skb, mac_len); 3457 3458 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3459 gso_type |= SKB_GSO_UDP_TUNNEL; 3460 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3461 gso_type |= SKB_GSO_GRE; 3462 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3463 gso_type |= SKB_GSO_IPXIP6; 3464 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3465 gso_type |= SKB_GSO_IPXIP4; 3466 3467 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3468 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3469 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3470 sizeof(struct ipv6hdr) : 3471 sizeof(struct iphdr); 3472 3473 skb_set_transport_header(skb, mac_len + nh_len); 3474 } 3475 3476 /* Match skb->protocol to new outer l3 protocol */ 3477 if (skb->protocol == htons(ETH_P_IP) && 3478 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3479 skb->protocol = htons(ETH_P_IPV6); 3480 else if (skb->protocol == htons(ETH_P_IPV6) && 3481 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3482 skb->protocol = htons(ETH_P_IP); 3483 } 3484 3485 if (skb_is_gso(skb)) { 3486 struct skb_shared_info *shinfo = skb_shinfo(skb); 3487 3488 /* Due to header grow, MSS needs to be downgraded. */ 3489 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3490 skb_decrease_gso_size(shinfo, len_diff); 3491 3492 /* Header must be checked, and gso_segs recomputed. */ 3493 shinfo->gso_type |= gso_type; 3494 shinfo->gso_segs = 0; 3495 } 3496 3497 return 0; 3498 } 3499 3500 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3501 u64 flags) 3502 { 3503 int ret; 3504 3505 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | 3506 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3507 return -EINVAL; 3508 3509 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3510 /* udp gso_size delineates datagrams, only allow if fixed */ 3511 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3512 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3513 return -ENOTSUPP; 3514 } 3515 3516 ret = skb_unclone(skb, GFP_ATOMIC); 3517 if (unlikely(ret < 0)) 3518 return ret; 3519 3520 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3521 if (unlikely(ret < 0)) 3522 return ret; 3523 3524 if (skb_is_gso(skb)) { 3525 struct skb_shared_info *shinfo = skb_shinfo(skb); 3526 3527 /* Due to header shrink, MSS can be upgraded. */ 3528 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3529 skb_increase_gso_size(shinfo, len_diff); 3530 3531 /* Header must be checked, and gso_segs recomputed. */ 3532 shinfo->gso_type |= SKB_GSO_DODGY; 3533 shinfo->gso_segs = 0; 3534 } 3535 3536 return 0; 3537 } 3538 3539 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC 3540 3541 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3542 u32, mode, u64, flags) 3543 { 3544 u32 len_diff_abs = abs(len_diff); 3545 bool shrink = len_diff < 0; 3546 int ret = 0; 3547 3548 if (unlikely(flags || mode)) 3549 return -EINVAL; 3550 if (unlikely(len_diff_abs > 0xfffU)) 3551 return -EFAULT; 3552 3553 if (!shrink) { 3554 ret = skb_cow(skb, len_diff); 3555 if (unlikely(ret < 0)) 3556 return ret; 3557 __skb_push(skb, len_diff_abs); 3558 memset(skb->data, 0, len_diff_abs); 3559 } else { 3560 if (unlikely(!pskb_may_pull(skb, len_diff_abs))) 3561 return -ENOMEM; 3562 __skb_pull(skb, len_diff_abs); 3563 } 3564 if (tls_sw_has_ctx_rx(skb->sk)) { 3565 struct strp_msg *rxm = strp_msg(skb); 3566 3567 rxm->full_len += len_diff; 3568 } 3569 return ret; 3570 } 3571 3572 static const struct bpf_func_proto sk_skb_adjust_room_proto = { 3573 .func = sk_skb_adjust_room, 3574 .gpl_only = false, 3575 .ret_type = RET_INTEGER, 3576 .arg1_type = ARG_PTR_TO_CTX, 3577 .arg2_type = ARG_ANYTHING, 3578 .arg3_type = ARG_ANYTHING, 3579 .arg4_type = ARG_ANYTHING, 3580 }; 3581 3582 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3583 u32, mode, u64, flags) 3584 { 3585 u32 len_cur, len_diff_abs = abs(len_diff); 3586 u32 len_min = bpf_skb_net_base_len(skb); 3587 u32 len_max = BPF_SKB_MAX_LEN; 3588 __be16 proto = skb->protocol; 3589 bool shrink = len_diff < 0; 3590 u32 off; 3591 int ret; 3592 3593 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | 3594 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3595 return -EINVAL; 3596 if (unlikely(len_diff_abs > 0xfffU)) 3597 return -EFAULT; 3598 if (unlikely(proto != htons(ETH_P_IP) && 3599 proto != htons(ETH_P_IPV6))) 3600 return -ENOTSUPP; 3601 3602 off = skb_mac_header_len(skb); 3603 switch (mode) { 3604 case BPF_ADJ_ROOM_NET: 3605 off += bpf_skb_net_base_len(skb); 3606 break; 3607 case BPF_ADJ_ROOM_MAC: 3608 break; 3609 default: 3610 return -ENOTSUPP; 3611 } 3612 3613 len_cur = skb->len - skb_network_offset(skb); 3614 if ((shrink && (len_diff_abs >= len_cur || 3615 len_cur - len_diff_abs < len_min)) || 3616 (!shrink && (skb->len + len_diff_abs > len_max && 3617 !skb_is_gso(skb)))) 3618 return -ENOTSUPP; 3619 3620 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3621 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3622 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) 3623 __skb_reset_checksum_unnecessary(skb); 3624 3625 bpf_compute_data_pointers(skb); 3626 return ret; 3627 } 3628 3629 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3630 .func = bpf_skb_adjust_room, 3631 .gpl_only = false, 3632 .ret_type = RET_INTEGER, 3633 .arg1_type = ARG_PTR_TO_CTX, 3634 .arg2_type = ARG_ANYTHING, 3635 .arg3_type = ARG_ANYTHING, 3636 .arg4_type = ARG_ANYTHING, 3637 }; 3638 3639 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3640 { 3641 u32 min_len = skb_network_offset(skb); 3642 3643 if (skb_transport_header_was_set(skb)) 3644 min_len = skb_transport_offset(skb); 3645 if (skb->ip_summed == CHECKSUM_PARTIAL) 3646 min_len = skb_checksum_start_offset(skb) + 3647 skb->csum_offset + sizeof(__sum16); 3648 return min_len; 3649 } 3650 3651 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3652 { 3653 unsigned int old_len = skb->len; 3654 int ret; 3655 3656 ret = __skb_grow_rcsum(skb, new_len); 3657 if (!ret) 3658 memset(skb->data + old_len, 0, new_len - old_len); 3659 return ret; 3660 } 3661 3662 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3663 { 3664 return __skb_trim_rcsum(skb, new_len); 3665 } 3666 3667 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3668 u64 flags) 3669 { 3670 u32 max_len = BPF_SKB_MAX_LEN; 3671 u32 min_len = __bpf_skb_min_len(skb); 3672 int ret; 3673 3674 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3675 return -EINVAL; 3676 if (skb->encapsulation) 3677 return -ENOTSUPP; 3678 3679 /* The basic idea of this helper is that it's performing the 3680 * needed work to either grow or trim an skb, and eBPF program 3681 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3682 * bpf_lX_csum_replace() and others rather than passing a raw 3683 * buffer here. This one is a slow path helper and intended 3684 * for replies with control messages. 3685 * 3686 * Like in bpf_skb_change_proto(), we want to keep this rather 3687 * minimal and without protocol specifics so that we are able 3688 * to separate concerns as in bpf_skb_store_bytes() should only 3689 * be the one responsible for writing buffers. 3690 * 3691 * It's really expected to be a slow path operation here for 3692 * control message replies, so we're implicitly linearizing, 3693 * uncloning and drop offloads from the skb by this. 3694 */ 3695 ret = __bpf_try_make_writable(skb, skb->len); 3696 if (!ret) { 3697 if (new_len > skb->len) 3698 ret = bpf_skb_grow_rcsum(skb, new_len); 3699 else if (new_len < skb->len) 3700 ret = bpf_skb_trim_rcsum(skb, new_len); 3701 if (!ret && skb_is_gso(skb)) 3702 skb_gso_reset(skb); 3703 } 3704 return ret; 3705 } 3706 3707 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3708 u64, flags) 3709 { 3710 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3711 3712 bpf_compute_data_pointers(skb); 3713 return ret; 3714 } 3715 3716 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3717 .func = bpf_skb_change_tail, 3718 .gpl_only = false, 3719 .ret_type = RET_INTEGER, 3720 .arg1_type = ARG_PTR_TO_CTX, 3721 .arg2_type = ARG_ANYTHING, 3722 .arg3_type = ARG_ANYTHING, 3723 }; 3724 3725 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3726 u64, flags) 3727 { 3728 return __bpf_skb_change_tail(skb, new_len, flags); 3729 } 3730 3731 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3732 .func = sk_skb_change_tail, 3733 .gpl_only = false, 3734 .ret_type = RET_INTEGER, 3735 .arg1_type = ARG_PTR_TO_CTX, 3736 .arg2_type = ARG_ANYTHING, 3737 .arg3_type = ARG_ANYTHING, 3738 }; 3739 3740 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3741 u64 flags) 3742 { 3743 u32 max_len = BPF_SKB_MAX_LEN; 3744 u32 new_len = skb->len + head_room; 3745 int ret; 3746 3747 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3748 new_len < skb->len)) 3749 return -EINVAL; 3750 3751 ret = skb_cow(skb, head_room); 3752 if (likely(!ret)) { 3753 /* Idea for this helper is that we currently only 3754 * allow to expand on mac header. This means that 3755 * skb->protocol network header, etc, stay as is. 3756 * Compared to bpf_skb_change_tail(), we're more 3757 * flexible due to not needing to linearize or 3758 * reset GSO. Intention for this helper is to be 3759 * used by an L3 skb that needs to push mac header 3760 * for redirection into L2 device. 3761 */ 3762 __skb_push(skb, head_room); 3763 memset(skb->data, 0, head_room); 3764 skb_reset_mac_header(skb); 3765 skb_reset_mac_len(skb); 3766 } 3767 3768 return ret; 3769 } 3770 3771 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3772 u64, flags) 3773 { 3774 int ret = __bpf_skb_change_head(skb, head_room, flags); 3775 3776 bpf_compute_data_pointers(skb); 3777 return ret; 3778 } 3779 3780 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3781 .func = bpf_skb_change_head, 3782 .gpl_only = false, 3783 .ret_type = RET_INTEGER, 3784 .arg1_type = ARG_PTR_TO_CTX, 3785 .arg2_type = ARG_ANYTHING, 3786 .arg3_type = ARG_ANYTHING, 3787 }; 3788 3789 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3790 u64, flags) 3791 { 3792 return __bpf_skb_change_head(skb, head_room, flags); 3793 } 3794 3795 static const struct bpf_func_proto sk_skb_change_head_proto = { 3796 .func = sk_skb_change_head, 3797 .gpl_only = false, 3798 .ret_type = RET_INTEGER, 3799 .arg1_type = ARG_PTR_TO_CTX, 3800 .arg2_type = ARG_ANYTHING, 3801 .arg3_type = ARG_ANYTHING, 3802 }; 3803 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3804 { 3805 return xdp_data_meta_unsupported(xdp) ? 0 : 3806 xdp->data - xdp->data_meta; 3807 } 3808 3809 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3810 { 3811 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3812 unsigned long metalen = xdp_get_metalen(xdp); 3813 void *data_start = xdp_frame_end + metalen; 3814 void *data = xdp->data + offset; 3815 3816 if (unlikely(data < data_start || 3817 data > xdp->data_end - ETH_HLEN)) 3818 return -EINVAL; 3819 3820 if (metalen) 3821 memmove(xdp->data_meta + offset, 3822 xdp->data_meta, metalen); 3823 xdp->data_meta += offset; 3824 xdp->data = data; 3825 3826 return 0; 3827 } 3828 3829 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3830 .func = bpf_xdp_adjust_head, 3831 .gpl_only = false, 3832 .ret_type = RET_INTEGER, 3833 .arg1_type = ARG_PTR_TO_CTX, 3834 .arg2_type = ARG_ANYTHING, 3835 }; 3836 3837 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 3838 { 3839 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ 3840 void *data_end = xdp->data_end + offset; 3841 3842 /* Notice that xdp_data_hard_end have reserved some tailroom */ 3843 if (unlikely(data_end > data_hard_end)) 3844 return -EINVAL; 3845 3846 /* ALL drivers MUST init xdp->frame_sz, chicken check below */ 3847 if (unlikely(xdp->frame_sz > PAGE_SIZE)) { 3848 WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz); 3849 return -EINVAL; 3850 } 3851 3852 if (unlikely(data_end < xdp->data + ETH_HLEN)) 3853 return -EINVAL; 3854 3855 /* Clear memory area on grow, can contain uninit kernel memory */ 3856 if (offset > 0) 3857 memset(xdp->data_end, 0, offset); 3858 3859 xdp->data_end = data_end; 3860 3861 return 0; 3862 } 3863 3864 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 3865 .func = bpf_xdp_adjust_tail, 3866 .gpl_only = false, 3867 .ret_type = RET_INTEGER, 3868 .arg1_type = ARG_PTR_TO_CTX, 3869 .arg2_type = ARG_ANYTHING, 3870 }; 3871 3872 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 3873 { 3874 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3875 void *meta = xdp->data_meta + offset; 3876 unsigned long metalen = xdp->data - meta; 3877 3878 if (xdp_data_meta_unsupported(xdp)) 3879 return -ENOTSUPP; 3880 if (unlikely(meta < xdp_frame_end || 3881 meta > xdp->data)) 3882 return -EINVAL; 3883 if (unlikely((metalen & (sizeof(__u32) - 1)) || 3884 (metalen > 32))) 3885 return -EACCES; 3886 3887 xdp->data_meta = meta; 3888 3889 return 0; 3890 } 3891 3892 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 3893 .func = bpf_xdp_adjust_meta, 3894 .gpl_only = false, 3895 .ret_type = RET_INTEGER, 3896 .arg1_type = ARG_PTR_TO_CTX, 3897 .arg2_type = ARG_ANYTHING, 3898 }; 3899 3900 /* XDP_REDIRECT works by a three-step process, implemented in the functions 3901 * below: 3902 * 3903 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target 3904 * of the redirect and store it (along with some other metadata) in a per-CPU 3905 * struct bpf_redirect_info. 3906 * 3907 * 2. When the program returns the XDP_REDIRECT return code, the driver will 3908 * call xdp_do_redirect() which will use the information in struct 3909 * bpf_redirect_info to actually enqueue the frame into a map type-specific 3910 * bulk queue structure. 3911 * 3912 * 3. Before exiting its NAPI poll loop, the driver will call xdp_do_flush(), 3913 * which will flush all the different bulk queues, thus completing the 3914 * redirect. 3915 * 3916 * Pointers to the map entries will be kept around for this whole sequence of 3917 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in 3918 * the core code; instead, the RCU protection relies on everything happening 3919 * inside a single NAPI poll sequence, which means it's between a pair of calls 3920 * to local_bh_disable()/local_bh_enable(). 3921 * 3922 * The map entries are marked as __rcu and the map code makes sure to 3923 * dereference those pointers with rcu_dereference_check() in a way that works 3924 * for both sections that to hold an rcu_read_lock() and sections that are 3925 * called from NAPI without a separate rcu_read_lock(). The code below does not 3926 * use RCU annotations, but relies on those in the map code. 3927 */ 3928 void xdp_do_flush(void) 3929 { 3930 __dev_flush(); 3931 __cpu_map_flush(); 3932 __xsk_map_flush(); 3933 } 3934 EXPORT_SYMBOL_GPL(xdp_do_flush); 3935 3936 void bpf_clear_redirect_map(struct bpf_map *map) 3937 { 3938 struct bpf_redirect_info *ri; 3939 int cpu; 3940 3941 for_each_possible_cpu(cpu) { 3942 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 3943 /* Avoid polluting remote cacheline due to writes if 3944 * not needed. Once we pass this test, we need the 3945 * cmpxchg() to make sure it hasn't been changed in 3946 * the meantime by remote CPU. 3947 */ 3948 if (unlikely(READ_ONCE(ri->map) == map)) 3949 cmpxchg(&ri->map, map, NULL); 3950 } 3951 } 3952 3953 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 3954 struct bpf_prog *xdp_prog) 3955 { 3956 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3957 enum bpf_map_type map_type = ri->map_type; 3958 void *fwd = ri->tgt_value; 3959 u32 map_id = ri->map_id; 3960 struct bpf_map *map; 3961 int err; 3962 3963 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 3964 ri->map_type = BPF_MAP_TYPE_UNSPEC; 3965 3966 switch (map_type) { 3967 case BPF_MAP_TYPE_DEVMAP: 3968 fallthrough; 3969 case BPF_MAP_TYPE_DEVMAP_HASH: 3970 map = READ_ONCE(ri->map); 3971 if (unlikely(map)) { 3972 WRITE_ONCE(ri->map, NULL); 3973 err = dev_map_enqueue_multi(xdp, dev, map, 3974 ri->flags & BPF_F_EXCLUDE_INGRESS); 3975 } else { 3976 err = dev_map_enqueue(fwd, xdp, dev); 3977 } 3978 break; 3979 case BPF_MAP_TYPE_CPUMAP: 3980 err = cpu_map_enqueue(fwd, xdp, dev); 3981 break; 3982 case BPF_MAP_TYPE_XSKMAP: 3983 err = __xsk_map_redirect(fwd, xdp); 3984 break; 3985 case BPF_MAP_TYPE_UNSPEC: 3986 if (map_id == INT_MAX) { 3987 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 3988 if (unlikely(!fwd)) { 3989 err = -EINVAL; 3990 break; 3991 } 3992 err = dev_xdp_enqueue(fwd, xdp, dev); 3993 break; 3994 } 3995 fallthrough; 3996 default: 3997 err = -EBADRQC; 3998 } 3999 4000 if (unlikely(err)) 4001 goto err; 4002 4003 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4004 return 0; 4005 err: 4006 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4007 return err; 4008 } 4009 EXPORT_SYMBOL_GPL(xdp_do_redirect); 4010 4011 static int xdp_do_generic_redirect_map(struct net_device *dev, 4012 struct sk_buff *skb, 4013 struct xdp_buff *xdp, 4014 struct bpf_prog *xdp_prog, 4015 void *fwd, 4016 enum bpf_map_type map_type, u32 map_id) 4017 { 4018 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4019 struct bpf_map *map; 4020 int err; 4021 4022 switch (map_type) { 4023 case BPF_MAP_TYPE_DEVMAP: 4024 fallthrough; 4025 case BPF_MAP_TYPE_DEVMAP_HASH: 4026 map = READ_ONCE(ri->map); 4027 if (unlikely(map)) { 4028 WRITE_ONCE(ri->map, NULL); 4029 err = dev_map_redirect_multi(dev, skb, xdp_prog, map, 4030 ri->flags & BPF_F_EXCLUDE_INGRESS); 4031 } else { 4032 err = dev_map_generic_redirect(fwd, skb, xdp_prog); 4033 } 4034 if (unlikely(err)) 4035 goto err; 4036 break; 4037 case BPF_MAP_TYPE_XSKMAP: 4038 err = xsk_generic_rcv(fwd, xdp); 4039 if (err) 4040 goto err; 4041 consume_skb(skb); 4042 break; 4043 default: 4044 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ 4045 err = -EBADRQC; 4046 goto err; 4047 } 4048 4049 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4050 return 0; 4051 err: 4052 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4053 return err; 4054 } 4055 4056 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 4057 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 4058 { 4059 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4060 enum bpf_map_type map_type = ri->map_type; 4061 void *fwd = ri->tgt_value; 4062 u32 map_id = ri->map_id; 4063 int err; 4064 4065 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4066 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4067 4068 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) { 4069 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4070 if (unlikely(!fwd)) { 4071 err = -EINVAL; 4072 goto err; 4073 } 4074 4075 err = xdp_ok_fwd_dev(fwd, skb->len); 4076 if (unlikely(err)) 4077 goto err; 4078 4079 skb->dev = fwd; 4080 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index); 4081 generic_xdp_tx(skb, xdp_prog); 4082 return 0; 4083 } 4084 4085 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id); 4086 err: 4087 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err); 4088 return err; 4089 } 4090 4091 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 4092 { 4093 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4094 4095 if (unlikely(flags)) 4096 return XDP_ABORTED; 4097 4098 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated 4099 * by map_idr) is used for ifindex based XDP redirect. 4100 */ 4101 ri->tgt_index = ifindex; 4102 ri->map_id = INT_MAX; 4103 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4104 4105 return XDP_REDIRECT; 4106 } 4107 4108 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 4109 .func = bpf_xdp_redirect, 4110 .gpl_only = false, 4111 .ret_type = RET_INTEGER, 4112 .arg1_type = ARG_ANYTHING, 4113 .arg2_type = ARG_ANYTHING, 4114 }; 4115 4116 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, 4117 u64, flags) 4118 { 4119 return map->ops->map_redirect(map, ifindex, flags); 4120 } 4121 4122 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 4123 .func = bpf_xdp_redirect_map, 4124 .gpl_only = false, 4125 .ret_type = RET_INTEGER, 4126 .arg1_type = ARG_CONST_MAP_PTR, 4127 .arg2_type = ARG_ANYTHING, 4128 .arg3_type = ARG_ANYTHING, 4129 }; 4130 4131 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 4132 unsigned long off, unsigned long len) 4133 { 4134 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 4135 4136 if (unlikely(!ptr)) 4137 return len; 4138 if (ptr != dst_buff) 4139 memcpy(dst_buff, ptr, len); 4140 4141 return 0; 4142 } 4143 4144 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 4145 u64, flags, void *, meta, u64, meta_size) 4146 { 4147 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4148 4149 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4150 return -EINVAL; 4151 if (unlikely(!skb || skb_size > skb->len)) 4152 return -EFAULT; 4153 4154 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 4155 bpf_skb_copy); 4156 } 4157 4158 static const struct bpf_func_proto bpf_skb_event_output_proto = { 4159 .func = bpf_skb_event_output, 4160 .gpl_only = true, 4161 .ret_type = RET_INTEGER, 4162 .arg1_type = ARG_PTR_TO_CTX, 4163 .arg2_type = ARG_CONST_MAP_PTR, 4164 .arg3_type = ARG_ANYTHING, 4165 .arg4_type = ARG_PTR_TO_MEM, 4166 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4167 }; 4168 4169 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff) 4170 4171 const struct bpf_func_proto bpf_skb_output_proto = { 4172 .func = bpf_skb_event_output, 4173 .gpl_only = true, 4174 .ret_type = RET_INTEGER, 4175 .arg1_type = ARG_PTR_TO_BTF_ID, 4176 .arg1_btf_id = &bpf_skb_output_btf_ids[0], 4177 .arg2_type = ARG_CONST_MAP_PTR, 4178 .arg3_type = ARG_ANYTHING, 4179 .arg4_type = ARG_PTR_TO_MEM, 4180 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4181 }; 4182 4183 static unsigned short bpf_tunnel_key_af(u64 flags) 4184 { 4185 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 4186 } 4187 4188 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 4189 u32, size, u64, flags) 4190 { 4191 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4192 u8 compat[sizeof(struct bpf_tunnel_key)]; 4193 void *to_orig = to; 4194 int err; 4195 4196 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { 4197 err = -EINVAL; 4198 goto err_clear; 4199 } 4200 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 4201 err = -EPROTO; 4202 goto err_clear; 4203 } 4204 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4205 err = -EINVAL; 4206 switch (size) { 4207 case offsetof(struct bpf_tunnel_key, tunnel_label): 4208 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4209 goto set_compat; 4210 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4211 /* Fixup deprecated structure layouts here, so we have 4212 * a common path later on. 4213 */ 4214 if (ip_tunnel_info_af(info) != AF_INET) 4215 goto err_clear; 4216 set_compat: 4217 to = (struct bpf_tunnel_key *)compat; 4218 break; 4219 default: 4220 goto err_clear; 4221 } 4222 } 4223 4224 to->tunnel_id = be64_to_cpu(info->key.tun_id); 4225 to->tunnel_tos = info->key.tos; 4226 to->tunnel_ttl = info->key.ttl; 4227 to->tunnel_ext = 0; 4228 4229 if (flags & BPF_F_TUNINFO_IPV6) { 4230 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 4231 sizeof(to->remote_ipv6)); 4232 to->tunnel_label = be32_to_cpu(info->key.label); 4233 } else { 4234 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 4235 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4236 to->tunnel_label = 0; 4237 } 4238 4239 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 4240 memcpy(to_orig, to, size); 4241 4242 return 0; 4243 err_clear: 4244 memset(to_orig, 0, size); 4245 return err; 4246 } 4247 4248 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 4249 .func = bpf_skb_get_tunnel_key, 4250 .gpl_only = false, 4251 .ret_type = RET_INTEGER, 4252 .arg1_type = ARG_PTR_TO_CTX, 4253 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4254 .arg3_type = ARG_CONST_SIZE, 4255 .arg4_type = ARG_ANYTHING, 4256 }; 4257 4258 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 4259 { 4260 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4261 int err; 4262 4263 if (unlikely(!info || 4264 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 4265 err = -ENOENT; 4266 goto err_clear; 4267 } 4268 if (unlikely(size < info->options_len)) { 4269 err = -ENOMEM; 4270 goto err_clear; 4271 } 4272 4273 ip_tunnel_info_opts_get(to, info); 4274 if (size > info->options_len) 4275 memset(to + info->options_len, 0, size - info->options_len); 4276 4277 return info->options_len; 4278 err_clear: 4279 memset(to, 0, size); 4280 return err; 4281 } 4282 4283 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 4284 .func = bpf_skb_get_tunnel_opt, 4285 .gpl_only = false, 4286 .ret_type = RET_INTEGER, 4287 .arg1_type = ARG_PTR_TO_CTX, 4288 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4289 .arg3_type = ARG_CONST_SIZE, 4290 }; 4291 4292 static struct metadata_dst __percpu *md_dst; 4293 4294 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 4295 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 4296 { 4297 struct metadata_dst *md = this_cpu_ptr(md_dst); 4298 u8 compat[sizeof(struct bpf_tunnel_key)]; 4299 struct ip_tunnel_info *info; 4300 4301 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 4302 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) 4303 return -EINVAL; 4304 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4305 switch (size) { 4306 case offsetof(struct bpf_tunnel_key, tunnel_label): 4307 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4308 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4309 /* Fixup deprecated structure layouts here, so we have 4310 * a common path later on. 4311 */ 4312 memcpy(compat, from, size); 4313 memset(compat + size, 0, sizeof(compat) - size); 4314 from = (const struct bpf_tunnel_key *) compat; 4315 break; 4316 default: 4317 return -EINVAL; 4318 } 4319 } 4320 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 4321 from->tunnel_ext)) 4322 return -EINVAL; 4323 4324 skb_dst_drop(skb); 4325 dst_hold((struct dst_entry *) md); 4326 skb_dst_set(skb, (struct dst_entry *) md); 4327 4328 info = &md->u.tun_info; 4329 memset(info, 0, sizeof(*info)); 4330 info->mode = IP_TUNNEL_INFO_TX; 4331 4332 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 4333 if (flags & BPF_F_DONT_FRAGMENT) 4334 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 4335 if (flags & BPF_F_ZERO_CSUM_TX) 4336 info->key.tun_flags &= ~TUNNEL_CSUM; 4337 if (flags & BPF_F_SEQ_NUMBER) 4338 info->key.tun_flags |= TUNNEL_SEQ; 4339 4340 info->key.tun_id = cpu_to_be64(from->tunnel_id); 4341 info->key.tos = from->tunnel_tos; 4342 info->key.ttl = from->tunnel_ttl; 4343 4344 if (flags & BPF_F_TUNINFO_IPV6) { 4345 info->mode |= IP_TUNNEL_INFO_IPV6; 4346 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 4347 sizeof(from->remote_ipv6)); 4348 info->key.label = cpu_to_be32(from->tunnel_label) & 4349 IPV6_FLOWLABEL_MASK; 4350 } else { 4351 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 4352 } 4353 4354 return 0; 4355 } 4356 4357 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 4358 .func = bpf_skb_set_tunnel_key, 4359 .gpl_only = false, 4360 .ret_type = RET_INTEGER, 4361 .arg1_type = ARG_PTR_TO_CTX, 4362 .arg2_type = ARG_PTR_TO_MEM, 4363 .arg3_type = ARG_CONST_SIZE, 4364 .arg4_type = ARG_ANYTHING, 4365 }; 4366 4367 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4368 const u8 *, from, u32, size) 4369 { 4370 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4371 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4372 4373 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4374 return -EINVAL; 4375 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4376 return -ENOMEM; 4377 4378 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4379 4380 return 0; 4381 } 4382 4383 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4384 .func = bpf_skb_set_tunnel_opt, 4385 .gpl_only = false, 4386 .ret_type = RET_INTEGER, 4387 .arg1_type = ARG_PTR_TO_CTX, 4388 .arg2_type = ARG_PTR_TO_MEM, 4389 .arg3_type = ARG_CONST_SIZE, 4390 }; 4391 4392 static const struct bpf_func_proto * 4393 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4394 { 4395 if (!md_dst) { 4396 struct metadata_dst __percpu *tmp; 4397 4398 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4399 METADATA_IP_TUNNEL, 4400 GFP_KERNEL); 4401 if (!tmp) 4402 return NULL; 4403 if (cmpxchg(&md_dst, NULL, tmp)) 4404 metadata_dst_free_percpu(tmp); 4405 } 4406 4407 switch (which) { 4408 case BPF_FUNC_skb_set_tunnel_key: 4409 return &bpf_skb_set_tunnel_key_proto; 4410 case BPF_FUNC_skb_set_tunnel_opt: 4411 return &bpf_skb_set_tunnel_opt_proto; 4412 default: 4413 return NULL; 4414 } 4415 } 4416 4417 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4418 u32, idx) 4419 { 4420 struct bpf_array *array = container_of(map, struct bpf_array, map); 4421 struct cgroup *cgrp; 4422 struct sock *sk; 4423 4424 sk = skb_to_full_sk(skb); 4425 if (!sk || !sk_fullsock(sk)) 4426 return -ENOENT; 4427 if (unlikely(idx >= array->map.max_entries)) 4428 return -E2BIG; 4429 4430 cgrp = READ_ONCE(array->ptrs[idx]); 4431 if (unlikely(!cgrp)) 4432 return -EAGAIN; 4433 4434 return sk_under_cgroup_hierarchy(sk, cgrp); 4435 } 4436 4437 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4438 .func = bpf_skb_under_cgroup, 4439 .gpl_only = false, 4440 .ret_type = RET_INTEGER, 4441 .arg1_type = ARG_PTR_TO_CTX, 4442 .arg2_type = ARG_CONST_MAP_PTR, 4443 .arg3_type = ARG_ANYTHING, 4444 }; 4445 4446 #ifdef CONFIG_SOCK_CGROUP_DATA 4447 static inline u64 __bpf_sk_cgroup_id(struct sock *sk) 4448 { 4449 struct cgroup *cgrp; 4450 4451 sk = sk_to_full_sk(sk); 4452 if (!sk || !sk_fullsock(sk)) 4453 return 0; 4454 4455 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4456 return cgroup_id(cgrp); 4457 } 4458 4459 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4460 { 4461 return __bpf_sk_cgroup_id(skb->sk); 4462 } 4463 4464 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4465 .func = bpf_skb_cgroup_id, 4466 .gpl_only = false, 4467 .ret_type = RET_INTEGER, 4468 .arg1_type = ARG_PTR_TO_CTX, 4469 }; 4470 4471 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, 4472 int ancestor_level) 4473 { 4474 struct cgroup *ancestor; 4475 struct cgroup *cgrp; 4476 4477 sk = sk_to_full_sk(sk); 4478 if (!sk || !sk_fullsock(sk)) 4479 return 0; 4480 4481 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4482 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4483 if (!ancestor) 4484 return 0; 4485 4486 return cgroup_id(ancestor); 4487 } 4488 4489 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4490 ancestor_level) 4491 { 4492 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level); 4493 } 4494 4495 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4496 .func = bpf_skb_ancestor_cgroup_id, 4497 .gpl_only = false, 4498 .ret_type = RET_INTEGER, 4499 .arg1_type = ARG_PTR_TO_CTX, 4500 .arg2_type = ARG_ANYTHING, 4501 }; 4502 4503 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) 4504 { 4505 return __bpf_sk_cgroup_id(sk); 4506 } 4507 4508 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { 4509 .func = bpf_sk_cgroup_id, 4510 .gpl_only = false, 4511 .ret_type = RET_INTEGER, 4512 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4513 }; 4514 4515 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) 4516 { 4517 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); 4518 } 4519 4520 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { 4521 .func = bpf_sk_ancestor_cgroup_id, 4522 .gpl_only = false, 4523 .ret_type = RET_INTEGER, 4524 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4525 .arg2_type = ARG_ANYTHING, 4526 }; 4527 #endif 4528 4529 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, 4530 unsigned long off, unsigned long len) 4531 { 4532 memcpy(dst_buff, src_buff + off, len); 4533 return 0; 4534 } 4535 4536 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4537 u64, flags, void *, meta, u64, meta_size) 4538 { 4539 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4540 4541 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4542 return -EINVAL; 4543 if (unlikely(!xdp || 4544 xdp_size > (unsigned long)(xdp->data_end - xdp->data))) 4545 return -EFAULT; 4546 4547 return bpf_event_output(map, flags, meta, meta_size, xdp->data, 4548 xdp_size, bpf_xdp_copy); 4549 } 4550 4551 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4552 .func = bpf_xdp_event_output, 4553 .gpl_only = true, 4554 .ret_type = RET_INTEGER, 4555 .arg1_type = ARG_PTR_TO_CTX, 4556 .arg2_type = ARG_CONST_MAP_PTR, 4557 .arg3_type = ARG_ANYTHING, 4558 .arg4_type = ARG_PTR_TO_MEM, 4559 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4560 }; 4561 4562 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff) 4563 4564 const struct bpf_func_proto bpf_xdp_output_proto = { 4565 .func = bpf_xdp_event_output, 4566 .gpl_only = true, 4567 .ret_type = RET_INTEGER, 4568 .arg1_type = ARG_PTR_TO_BTF_ID, 4569 .arg1_btf_id = &bpf_xdp_output_btf_ids[0], 4570 .arg2_type = ARG_CONST_MAP_PTR, 4571 .arg3_type = ARG_ANYTHING, 4572 .arg4_type = ARG_PTR_TO_MEM, 4573 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4574 }; 4575 4576 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4577 { 4578 return skb->sk ? __sock_gen_cookie(skb->sk) : 0; 4579 } 4580 4581 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4582 .func = bpf_get_socket_cookie, 4583 .gpl_only = false, 4584 .ret_type = RET_INTEGER, 4585 .arg1_type = ARG_PTR_TO_CTX, 4586 }; 4587 4588 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4589 { 4590 return __sock_gen_cookie(ctx->sk); 4591 } 4592 4593 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4594 .func = bpf_get_socket_cookie_sock_addr, 4595 .gpl_only = false, 4596 .ret_type = RET_INTEGER, 4597 .arg1_type = ARG_PTR_TO_CTX, 4598 }; 4599 4600 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) 4601 { 4602 return __sock_gen_cookie(ctx); 4603 } 4604 4605 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { 4606 .func = bpf_get_socket_cookie_sock, 4607 .gpl_only = false, 4608 .ret_type = RET_INTEGER, 4609 .arg1_type = ARG_PTR_TO_CTX, 4610 }; 4611 4612 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) 4613 { 4614 return sk ? sock_gen_cookie(sk) : 0; 4615 } 4616 4617 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { 4618 .func = bpf_get_socket_ptr_cookie, 4619 .gpl_only = false, 4620 .ret_type = RET_INTEGER, 4621 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4622 }; 4623 4624 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 4625 { 4626 return __sock_gen_cookie(ctx->sk); 4627 } 4628 4629 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 4630 .func = bpf_get_socket_cookie_sock_ops, 4631 .gpl_only = false, 4632 .ret_type = RET_INTEGER, 4633 .arg1_type = ARG_PTR_TO_CTX, 4634 }; 4635 4636 static u64 __bpf_get_netns_cookie(struct sock *sk) 4637 { 4638 const struct net *net = sk ? sock_net(sk) : &init_net; 4639 4640 return net->net_cookie; 4641 } 4642 4643 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) 4644 { 4645 return __bpf_get_netns_cookie(ctx); 4646 } 4647 4648 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { 4649 .func = bpf_get_netns_cookie_sock, 4650 .gpl_only = false, 4651 .ret_type = RET_INTEGER, 4652 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 4653 }; 4654 4655 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4656 { 4657 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 4658 } 4659 4660 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { 4661 .func = bpf_get_netns_cookie_sock_addr, 4662 .gpl_only = false, 4663 .ret_type = RET_INTEGER, 4664 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 4665 }; 4666 4667 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 4668 { 4669 struct sock *sk = sk_to_full_sk(skb->sk); 4670 kuid_t kuid; 4671 4672 if (!sk || !sk_fullsock(sk)) 4673 return overflowuid; 4674 kuid = sock_net_uid(sock_net(sk), sk); 4675 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 4676 } 4677 4678 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 4679 .func = bpf_get_socket_uid, 4680 .gpl_only = false, 4681 .ret_type = RET_INTEGER, 4682 .arg1_type = ARG_PTR_TO_CTX, 4683 }; 4684 4685 static int _bpf_setsockopt(struct sock *sk, int level, int optname, 4686 char *optval, int optlen) 4687 { 4688 char devname[IFNAMSIZ]; 4689 int val, valbool; 4690 struct net *net; 4691 int ifindex; 4692 int ret = 0; 4693 4694 if (!sk_fullsock(sk)) 4695 return -EINVAL; 4696 4697 sock_owned_by_me(sk); 4698 4699 if (level == SOL_SOCKET) { 4700 if (optlen != sizeof(int) && optname != SO_BINDTODEVICE) 4701 return -EINVAL; 4702 val = *((int *)optval); 4703 valbool = val ? 1 : 0; 4704 4705 /* Only some socketops are supported */ 4706 switch (optname) { 4707 case SO_RCVBUF: 4708 val = min_t(u32, val, sysctl_rmem_max); 4709 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 4710 WRITE_ONCE(sk->sk_rcvbuf, 4711 max_t(int, val * 2, SOCK_MIN_RCVBUF)); 4712 break; 4713 case SO_SNDBUF: 4714 val = min_t(u32, val, sysctl_wmem_max); 4715 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 4716 WRITE_ONCE(sk->sk_sndbuf, 4717 max_t(int, val * 2, SOCK_MIN_SNDBUF)); 4718 break; 4719 case SO_MAX_PACING_RATE: /* 32bit version */ 4720 if (val != ~0U) 4721 cmpxchg(&sk->sk_pacing_status, 4722 SK_PACING_NONE, 4723 SK_PACING_NEEDED); 4724 sk->sk_max_pacing_rate = (val == ~0U) ? 4725 ~0UL : (unsigned int)val; 4726 sk->sk_pacing_rate = min(sk->sk_pacing_rate, 4727 sk->sk_max_pacing_rate); 4728 break; 4729 case SO_PRIORITY: 4730 sk->sk_priority = val; 4731 break; 4732 case SO_RCVLOWAT: 4733 if (val < 0) 4734 val = INT_MAX; 4735 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 4736 break; 4737 case SO_MARK: 4738 if (sk->sk_mark != val) { 4739 sk->sk_mark = val; 4740 sk_dst_reset(sk); 4741 } 4742 break; 4743 case SO_BINDTODEVICE: 4744 optlen = min_t(long, optlen, IFNAMSIZ - 1); 4745 strncpy(devname, optval, optlen); 4746 devname[optlen] = 0; 4747 4748 ifindex = 0; 4749 if (devname[0] != '\0') { 4750 struct net_device *dev; 4751 4752 ret = -ENODEV; 4753 4754 net = sock_net(sk); 4755 dev = dev_get_by_name(net, devname); 4756 if (!dev) 4757 break; 4758 ifindex = dev->ifindex; 4759 dev_put(dev); 4760 } 4761 fallthrough; 4762 case SO_BINDTOIFINDEX: 4763 if (optname == SO_BINDTOIFINDEX) 4764 ifindex = val; 4765 ret = sock_bindtoindex(sk, ifindex, false); 4766 break; 4767 case SO_KEEPALIVE: 4768 if (sk->sk_prot->keepalive) 4769 sk->sk_prot->keepalive(sk, valbool); 4770 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 4771 break; 4772 case SO_REUSEPORT: 4773 sk->sk_reuseport = valbool; 4774 break; 4775 default: 4776 ret = -EINVAL; 4777 } 4778 #ifdef CONFIG_INET 4779 } else if (level == SOL_IP) { 4780 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4781 return -EINVAL; 4782 4783 val = *((int *)optval); 4784 /* Only some options are supported */ 4785 switch (optname) { 4786 case IP_TOS: 4787 if (val < -1 || val > 0xff) { 4788 ret = -EINVAL; 4789 } else { 4790 struct inet_sock *inet = inet_sk(sk); 4791 4792 if (val == -1) 4793 val = 0; 4794 inet->tos = val; 4795 } 4796 break; 4797 default: 4798 ret = -EINVAL; 4799 } 4800 #if IS_ENABLED(CONFIG_IPV6) 4801 } else if (level == SOL_IPV6) { 4802 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4803 return -EINVAL; 4804 4805 val = *((int *)optval); 4806 /* Only some options are supported */ 4807 switch (optname) { 4808 case IPV6_TCLASS: 4809 if (val < -1 || val > 0xff) { 4810 ret = -EINVAL; 4811 } else { 4812 struct ipv6_pinfo *np = inet6_sk(sk); 4813 4814 if (val == -1) 4815 val = 0; 4816 np->tclass = val; 4817 } 4818 break; 4819 default: 4820 ret = -EINVAL; 4821 } 4822 #endif 4823 } else if (level == SOL_TCP && 4824 sk->sk_prot->setsockopt == tcp_setsockopt) { 4825 if (optname == TCP_CONGESTION) { 4826 char name[TCP_CA_NAME_MAX]; 4827 4828 strncpy(name, optval, min_t(long, optlen, 4829 TCP_CA_NAME_MAX-1)); 4830 name[TCP_CA_NAME_MAX-1] = 0; 4831 ret = tcp_set_congestion_control(sk, name, false, true); 4832 } else { 4833 struct inet_connection_sock *icsk = inet_csk(sk); 4834 struct tcp_sock *tp = tcp_sk(sk); 4835 unsigned long timeout; 4836 4837 if (optlen != sizeof(int)) 4838 return -EINVAL; 4839 4840 val = *((int *)optval); 4841 /* Only some options are supported */ 4842 switch (optname) { 4843 case TCP_BPF_IW: 4844 if (val <= 0 || tp->data_segs_out > tp->syn_data) 4845 ret = -EINVAL; 4846 else 4847 tp->snd_cwnd = val; 4848 break; 4849 case TCP_BPF_SNDCWND_CLAMP: 4850 if (val <= 0) { 4851 ret = -EINVAL; 4852 } else { 4853 tp->snd_cwnd_clamp = val; 4854 tp->snd_ssthresh = val; 4855 } 4856 break; 4857 case TCP_BPF_DELACK_MAX: 4858 timeout = usecs_to_jiffies(val); 4859 if (timeout > TCP_DELACK_MAX || 4860 timeout < TCP_TIMEOUT_MIN) 4861 return -EINVAL; 4862 inet_csk(sk)->icsk_delack_max = timeout; 4863 break; 4864 case TCP_BPF_RTO_MIN: 4865 timeout = usecs_to_jiffies(val); 4866 if (timeout > TCP_RTO_MIN || 4867 timeout < TCP_TIMEOUT_MIN) 4868 return -EINVAL; 4869 inet_csk(sk)->icsk_rto_min = timeout; 4870 break; 4871 case TCP_SAVE_SYN: 4872 if (val < 0 || val > 1) 4873 ret = -EINVAL; 4874 else 4875 tp->save_syn = val; 4876 break; 4877 case TCP_KEEPIDLE: 4878 ret = tcp_sock_set_keepidle_locked(sk, val); 4879 break; 4880 case TCP_KEEPINTVL: 4881 if (val < 1 || val > MAX_TCP_KEEPINTVL) 4882 ret = -EINVAL; 4883 else 4884 tp->keepalive_intvl = val * HZ; 4885 break; 4886 case TCP_KEEPCNT: 4887 if (val < 1 || val > MAX_TCP_KEEPCNT) 4888 ret = -EINVAL; 4889 else 4890 tp->keepalive_probes = val; 4891 break; 4892 case TCP_SYNCNT: 4893 if (val < 1 || val > MAX_TCP_SYNCNT) 4894 ret = -EINVAL; 4895 else 4896 icsk->icsk_syn_retries = val; 4897 break; 4898 case TCP_USER_TIMEOUT: 4899 if (val < 0) 4900 ret = -EINVAL; 4901 else 4902 icsk->icsk_user_timeout = val; 4903 break; 4904 case TCP_NOTSENT_LOWAT: 4905 tp->notsent_lowat = val; 4906 sk->sk_write_space(sk); 4907 break; 4908 case TCP_WINDOW_CLAMP: 4909 ret = tcp_set_window_clamp(sk, val); 4910 break; 4911 default: 4912 ret = -EINVAL; 4913 } 4914 } 4915 #endif 4916 } else { 4917 ret = -EINVAL; 4918 } 4919 return ret; 4920 } 4921 4922 static int _bpf_getsockopt(struct sock *sk, int level, int optname, 4923 char *optval, int optlen) 4924 { 4925 if (!sk_fullsock(sk)) 4926 goto err_clear; 4927 4928 sock_owned_by_me(sk); 4929 4930 if (level == SOL_SOCKET) { 4931 if (optlen != sizeof(int)) 4932 goto err_clear; 4933 4934 switch (optname) { 4935 case SO_MARK: 4936 *((int *)optval) = sk->sk_mark; 4937 break; 4938 case SO_PRIORITY: 4939 *((int *)optval) = sk->sk_priority; 4940 break; 4941 case SO_BINDTOIFINDEX: 4942 *((int *)optval) = sk->sk_bound_dev_if; 4943 break; 4944 case SO_REUSEPORT: 4945 *((int *)optval) = sk->sk_reuseport; 4946 break; 4947 default: 4948 goto err_clear; 4949 } 4950 #ifdef CONFIG_INET 4951 } else if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { 4952 struct inet_connection_sock *icsk; 4953 struct tcp_sock *tp; 4954 4955 switch (optname) { 4956 case TCP_CONGESTION: 4957 icsk = inet_csk(sk); 4958 4959 if (!icsk->icsk_ca_ops || optlen <= 1) 4960 goto err_clear; 4961 strncpy(optval, icsk->icsk_ca_ops->name, optlen); 4962 optval[optlen - 1] = 0; 4963 break; 4964 case TCP_SAVED_SYN: 4965 tp = tcp_sk(sk); 4966 4967 if (optlen <= 0 || !tp->saved_syn || 4968 optlen > tcp_saved_syn_len(tp->saved_syn)) 4969 goto err_clear; 4970 memcpy(optval, tp->saved_syn->data, optlen); 4971 break; 4972 default: 4973 goto err_clear; 4974 } 4975 } else if (level == SOL_IP) { 4976 struct inet_sock *inet = inet_sk(sk); 4977 4978 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4979 goto err_clear; 4980 4981 /* Only some options are supported */ 4982 switch (optname) { 4983 case IP_TOS: 4984 *((int *)optval) = (int)inet->tos; 4985 break; 4986 default: 4987 goto err_clear; 4988 } 4989 #if IS_ENABLED(CONFIG_IPV6) 4990 } else if (level == SOL_IPV6) { 4991 struct ipv6_pinfo *np = inet6_sk(sk); 4992 4993 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4994 goto err_clear; 4995 4996 /* Only some options are supported */ 4997 switch (optname) { 4998 case IPV6_TCLASS: 4999 *((int *)optval) = (int)np->tclass; 5000 break; 5001 default: 5002 goto err_clear; 5003 } 5004 #endif 5005 #endif 5006 } else { 5007 goto err_clear; 5008 } 5009 return 0; 5010 err_clear: 5011 memset(optval, 0, optlen); 5012 return -EINVAL; 5013 } 5014 5015 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, 5016 int, level, int, optname, char *, optval, int, optlen) 5017 { 5018 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen); 5019 } 5020 5021 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { 5022 .func = bpf_sock_addr_setsockopt, 5023 .gpl_only = false, 5024 .ret_type = RET_INTEGER, 5025 .arg1_type = ARG_PTR_TO_CTX, 5026 .arg2_type = ARG_ANYTHING, 5027 .arg3_type = ARG_ANYTHING, 5028 .arg4_type = ARG_PTR_TO_MEM, 5029 .arg5_type = ARG_CONST_SIZE, 5030 }; 5031 5032 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, 5033 int, level, int, optname, char *, optval, int, optlen) 5034 { 5035 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); 5036 } 5037 5038 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { 5039 .func = bpf_sock_addr_getsockopt, 5040 .gpl_only = false, 5041 .ret_type = RET_INTEGER, 5042 .arg1_type = ARG_PTR_TO_CTX, 5043 .arg2_type = ARG_ANYTHING, 5044 .arg3_type = ARG_ANYTHING, 5045 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5046 .arg5_type = ARG_CONST_SIZE, 5047 }; 5048 5049 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5050 int, level, int, optname, char *, optval, int, optlen) 5051 { 5052 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen); 5053 } 5054 5055 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { 5056 .func = bpf_sock_ops_setsockopt, 5057 .gpl_only = false, 5058 .ret_type = RET_INTEGER, 5059 .arg1_type = ARG_PTR_TO_CTX, 5060 .arg2_type = ARG_ANYTHING, 5061 .arg3_type = ARG_ANYTHING, 5062 .arg4_type = ARG_PTR_TO_MEM, 5063 .arg5_type = ARG_CONST_SIZE, 5064 }; 5065 5066 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, 5067 int optname, const u8 **start) 5068 { 5069 struct sk_buff *syn_skb = bpf_sock->syn_skb; 5070 const u8 *hdr_start; 5071 int ret; 5072 5073 if (syn_skb) { 5074 /* sk is a request_sock here */ 5075 5076 if (optname == TCP_BPF_SYN) { 5077 hdr_start = syn_skb->data; 5078 ret = tcp_hdrlen(syn_skb); 5079 } else if (optname == TCP_BPF_SYN_IP) { 5080 hdr_start = skb_network_header(syn_skb); 5081 ret = skb_network_header_len(syn_skb) + 5082 tcp_hdrlen(syn_skb); 5083 } else { 5084 /* optname == TCP_BPF_SYN_MAC */ 5085 hdr_start = skb_mac_header(syn_skb); 5086 ret = skb_mac_header_len(syn_skb) + 5087 skb_network_header_len(syn_skb) + 5088 tcp_hdrlen(syn_skb); 5089 } 5090 } else { 5091 struct sock *sk = bpf_sock->sk; 5092 struct saved_syn *saved_syn; 5093 5094 if (sk->sk_state == TCP_NEW_SYN_RECV) 5095 /* synack retransmit. bpf_sock->syn_skb will 5096 * not be available. It has to resort to 5097 * saved_syn (if it is saved). 5098 */ 5099 saved_syn = inet_reqsk(sk)->saved_syn; 5100 else 5101 saved_syn = tcp_sk(sk)->saved_syn; 5102 5103 if (!saved_syn) 5104 return -ENOENT; 5105 5106 if (optname == TCP_BPF_SYN) { 5107 hdr_start = saved_syn->data + 5108 saved_syn->mac_hdrlen + 5109 saved_syn->network_hdrlen; 5110 ret = saved_syn->tcp_hdrlen; 5111 } else if (optname == TCP_BPF_SYN_IP) { 5112 hdr_start = saved_syn->data + 5113 saved_syn->mac_hdrlen; 5114 ret = saved_syn->network_hdrlen + 5115 saved_syn->tcp_hdrlen; 5116 } else { 5117 /* optname == TCP_BPF_SYN_MAC */ 5118 5119 /* TCP_SAVE_SYN may not have saved the mac hdr */ 5120 if (!saved_syn->mac_hdrlen) 5121 return -ENOENT; 5122 5123 hdr_start = saved_syn->data; 5124 ret = saved_syn->mac_hdrlen + 5125 saved_syn->network_hdrlen + 5126 saved_syn->tcp_hdrlen; 5127 } 5128 } 5129 5130 *start = hdr_start; 5131 return ret; 5132 } 5133 5134 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5135 int, level, int, optname, char *, optval, int, optlen) 5136 { 5137 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && 5138 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { 5139 int ret, copy_len = 0; 5140 const u8 *start; 5141 5142 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start); 5143 if (ret > 0) { 5144 copy_len = ret; 5145 if (optlen < copy_len) { 5146 copy_len = optlen; 5147 ret = -ENOSPC; 5148 } 5149 5150 memcpy(optval, start, copy_len); 5151 } 5152 5153 /* Zero out unused buffer at the end */ 5154 memset(optval + copy_len, 0, optlen - copy_len); 5155 5156 return ret; 5157 } 5158 5159 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); 5160 } 5161 5162 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { 5163 .func = bpf_sock_ops_getsockopt, 5164 .gpl_only = false, 5165 .ret_type = RET_INTEGER, 5166 .arg1_type = ARG_PTR_TO_CTX, 5167 .arg2_type = ARG_ANYTHING, 5168 .arg3_type = ARG_ANYTHING, 5169 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5170 .arg5_type = ARG_CONST_SIZE, 5171 }; 5172 5173 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 5174 int, argval) 5175 { 5176 struct sock *sk = bpf_sock->sk; 5177 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 5178 5179 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 5180 return -EINVAL; 5181 5182 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 5183 5184 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 5185 } 5186 5187 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 5188 .func = bpf_sock_ops_cb_flags_set, 5189 .gpl_only = false, 5190 .ret_type = RET_INTEGER, 5191 .arg1_type = ARG_PTR_TO_CTX, 5192 .arg2_type = ARG_ANYTHING, 5193 }; 5194 5195 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 5196 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 5197 5198 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 5199 int, addr_len) 5200 { 5201 #ifdef CONFIG_INET 5202 struct sock *sk = ctx->sk; 5203 u32 flags = BIND_FROM_BPF; 5204 int err; 5205 5206 err = -EINVAL; 5207 if (addr_len < offsetofend(struct sockaddr, sa_family)) 5208 return err; 5209 if (addr->sa_family == AF_INET) { 5210 if (addr_len < sizeof(struct sockaddr_in)) 5211 return err; 5212 if (((struct sockaddr_in *)addr)->sin_port == htons(0)) 5213 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5214 return __inet_bind(sk, addr, addr_len, flags); 5215 #if IS_ENABLED(CONFIG_IPV6) 5216 } else if (addr->sa_family == AF_INET6) { 5217 if (addr_len < SIN6_LEN_RFC2133) 5218 return err; 5219 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) 5220 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5221 /* ipv6_bpf_stub cannot be NULL, since it's called from 5222 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 5223 */ 5224 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); 5225 #endif /* CONFIG_IPV6 */ 5226 } 5227 #endif /* CONFIG_INET */ 5228 5229 return -EAFNOSUPPORT; 5230 } 5231 5232 static const struct bpf_func_proto bpf_bind_proto = { 5233 .func = bpf_bind, 5234 .gpl_only = false, 5235 .ret_type = RET_INTEGER, 5236 .arg1_type = ARG_PTR_TO_CTX, 5237 .arg2_type = ARG_PTR_TO_MEM, 5238 .arg3_type = ARG_CONST_SIZE, 5239 }; 5240 5241 #ifdef CONFIG_XFRM 5242 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 5243 struct bpf_xfrm_state *, to, u32, size, u64, flags) 5244 { 5245 const struct sec_path *sp = skb_sec_path(skb); 5246 const struct xfrm_state *x; 5247 5248 if (!sp || unlikely(index >= sp->len || flags)) 5249 goto err_clear; 5250 5251 x = sp->xvec[index]; 5252 5253 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 5254 goto err_clear; 5255 5256 to->reqid = x->props.reqid; 5257 to->spi = x->id.spi; 5258 to->family = x->props.family; 5259 to->ext = 0; 5260 5261 if (to->family == AF_INET6) { 5262 memcpy(to->remote_ipv6, x->props.saddr.a6, 5263 sizeof(to->remote_ipv6)); 5264 } else { 5265 to->remote_ipv4 = x->props.saddr.a4; 5266 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 5267 } 5268 5269 return 0; 5270 err_clear: 5271 memset(to, 0, size); 5272 return -EINVAL; 5273 } 5274 5275 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 5276 .func = bpf_skb_get_xfrm_state, 5277 .gpl_only = false, 5278 .ret_type = RET_INTEGER, 5279 .arg1_type = ARG_PTR_TO_CTX, 5280 .arg2_type = ARG_ANYTHING, 5281 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 5282 .arg4_type = ARG_CONST_SIZE, 5283 .arg5_type = ARG_ANYTHING, 5284 }; 5285 #endif 5286 5287 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 5288 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, 5289 const struct neighbour *neigh, 5290 const struct net_device *dev, u32 mtu) 5291 { 5292 memcpy(params->dmac, neigh->ha, ETH_ALEN); 5293 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 5294 params->h_vlan_TCI = 0; 5295 params->h_vlan_proto = 0; 5296 if (mtu) 5297 params->mtu_result = mtu; /* union with tot_len */ 5298 5299 return 0; 5300 } 5301 #endif 5302 5303 #if IS_ENABLED(CONFIG_INET) 5304 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5305 u32 flags, bool check_mtu) 5306 { 5307 struct fib_nh_common *nhc; 5308 struct in_device *in_dev; 5309 struct neighbour *neigh; 5310 struct net_device *dev; 5311 struct fib_result res; 5312 struct flowi4 fl4; 5313 u32 mtu = 0; 5314 int err; 5315 5316 dev = dev_get_by_index_rcu(net, params->ifindex); 5317 if (unlikely(!dev)) 5318 return -ENODEV; 5319 5320 /* verify forwarding is enabled on this interface */ 5321 in_dev = __in_dev_get_rcu(dev); 5322 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 5323 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5324 5325 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5326 fl4.flowi4_iif = 1; 5327 fl4.flowi4_oif = params->ifindex; 5328 } else { 5329 fl4.flowi4_iif = params->ifindex; 5330 fl4.flowi4_oif = 0; 5331 } 5332 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 5333 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 5334 fl4.flowi4_flags = 0; 5335 5336 fl4.flowi4_proto = params->l4_protocol; 5337 fl4.daddr = params->ipv4_dst; 5338 fl4.saddr = params->ipv4_src; 5339 fl4.fl4_sport = params->sport; 5340 fl4.fl4_dport = params->dport; 5341 fl4.flowi4_multipath_hash = 0; 5342 5343 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5344 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5345 struct fib_table *tb; 5346 5347 tb = fib_get_table(net, tbid); 5348 if (unlikely(!tb)) 5349 return BPF_FIB_LKUP_RET_NOT_FWDED; 5350 5351 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 5352 } else { 5353 fl4.flowi4_mark = 0; 5354 fl4.flowi4_secid = 0; 5355 fl4.flowi4_tun_key.tun_id = 0; 5356 fl4.flowi4_uid = sock_net_uid(net, NULL); 5357 5358 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 5359 } 5360 5361 if (err) { 5362 /* map fib lookup errors to RTN_ type */ 5363 if (err == -EINVAL) 5364 return BPF_FIB_LKUP_RET_BLACKHOLE; 5365 if (err == -EHOSTUNREACH) 5366 return BPF_FIB_LKUP_RET_UNREACHABLE; 5367 if (err == -EACCES) 5368 return BPF_FIB_LKUP_RET_PROHIBIT; 5369 5370 return BPF_FIB_LKUP_RET_NOT_FWDED; 5371 } 5372 5373 if (res.type != RTN_UNICAST) 5374 return BPF_FIB_LKUP_RET_NOT_FWDED; 5375 5376 if (fib_info_num_path(res.fi) > 1) 5377 fib_select_path(net, &res, &fl4, NULL); 5378 5379 if (check_mtu) { 5380 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 5381 if (params->tot_len > mtu) { 5382 params->mtu_result = mtu; /* union with tot_len */ 5383 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5384 } 5385 } 5386 5387 nhc = res.nhc; 5388 5389 /* do not handle lwt encaps right now */ 5390 if (nhc->nhc_lwtstate) 5391 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5392 5393 dev = nhc->nhc_dev; 5394 5395 params->rt_metric = res.fi->fib_priority; 5396 params->ifindex = dev->ifindex; 5397 5398 /* xdp and cls_bpf programs are run in RCU-bh so 5399 * rcu_read_lock_bh is not needed here 5400 */ 5401 if (likely(nhc->nhc_gw_family != AF_INET6)) { 5402 if (nhc->nhc_gw_family) 5403 params->ipv4_dst = nhc->nhc_gw.ipv4; 5404 5405 neigh = __ipv4_neigh_lookup_noref(dev, 5406 (__force u32)params->ipv4_dst); 5407 } else { 5408 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 5409 5410 params->family = AF_INET6; 5411 *dst = nhc->nhc_gw.ipv6; 5412 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 5413 } 5414 5415 if (!neigh) 5416 return BPF_FIB_LKUP_RET_NO_NEIGH; 5417 5418 return bpf_fib_set_fwd_params(params, neigh, dev, mtu); 5419 } 5420 #endif 5421 5422 #if IS_ENABLED(CONFIG_IPV6) 5423 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5424 u32 flags, bool check_mtu) 5425 { 5426 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 5427 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 5428 struct fib6_result res = {}; 5429 struct neighbour *neigh; 5430 struct net_device *dev; 5431 struct inet6_dev *idev; 5432 struct flowi6 fl6; 5433 int strict = 0; 5434 int oif, err; 5435 u32 mtu = 0; 5436 5437 /* link local addresses are never forwarded */ 5438 if (rt6_need_strict(dst) || rt6_need_strict(src)) 5439 return BPF_FIB_LKUP_RET_NOT_FWDED; 5440 5441 dev = dev_get_by_index_rcu(net, params->ifindex); 5442 if (unlikely(!dev)) 5443 return -ENODEV; 5444 5445 idev = __in6_dev_get_safely(dev); 5446 if (unlikely(!idev || !idev->cnf.forwarding)) 5447 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5448 5449 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5450 fl6.flowi6_iif = 1; 5451 oif = fl6.flowi6_oif = params->ifindex; 5452 } else { 5453 oif = fl6.flowi6_iif = params->ifindex; 5454 fl6.flowi6_oif = 0; 5455 strict = RT6_LOOKUP_F_HAS_SADDR; 5456 } 5457 fl6.flowlabel = params->flowinfo; 5458 fl6.flowi6_scope = 0; 5459 fl6.flowi6_flags = 0; 5460 fl6.mp_hash = 0; 5461 5462 fl6.flowi6_proto = params->l4_protocol; 5463 fl6.daddr = *dst; 5464 fl6.saddr = *src; 5465 fl6.fl6_sport = params->sport; 5466 fl6.fl6_dport = params->dport; 5467 5468 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5469 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5470 struct fib6_table *tb; 5471 5472 tb = ipv6_stub->fib6_get_table(net, tbid); 5473 if (unlikely(!tb)) 5474 return BPF_FIB_LKUP_RET_NOT_FWDED; 5475 5476 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 5477 strict); 5478 } else { 5479 fl6.flowi6_mark = 0; 5480 fl6.flowi6_secid = 0; 5481 fl6.flowi6_tun_key.tun_id = 0; 5482 fl6.flowi6_uid = sock_net_uid(net, NULL); 5483 5484 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 5485 } 5486 5487 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 5488 res.f6i == net->ipv6.fib6_null_entry)) 5489 return BPF_FIB_LKUP_RET_NOT_FWDED; 5490 5491 switch (res.fib6_type) { 5492 /* only unicast is forwarded */ 5493 case RTN_UNICAST: 5494 break; 5495 case RTN_BLACKHOLE: 5496 return BPF_FIB_LKUP_RET_BLACKHOLE; 5497 case RTN_UNREACHABLE: 5498 return BPF_FIB_LKUP_RET_UNREACHABLE; 5499 case RTN_PROHIBIT: 5500 return BPF_FIB_LKUP_RET_PROHIBIT; 5501 default: 5502 return BPF_FIB_LKUP_RET_NOT_FWDED; 5503 } 5504 5505 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 5506 fl6.flowi6_oif != 0, NULL, strict); 5507 5508 if (check_mtu) { 5509 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 5510 if (params->tot_len > mtu) { 5511 params->mtu_result = mtu; /* union with tot_len */ 5512 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5513 } 5514 } 5515 5516 if (res.nh->fib_nh_lws) 5517 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5518 5519 if (res.nh->fib_nh_gw_family) 5520 *dst = res.nh->fib_nh_gw6; 5521 5522 dev = res.nh->fib_nh_dev; 5523 params->rt_metric = res.f6i->fib6_metric; 5524 params->ifindex = dev->ifindex; 5525 5526 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 5527 * not needed here. 5528 */ 5529 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 5530 if (!neigh) 5531 return BPF_FIB_LKUP_RET_NO_NEIGH; 5532 5533 return bpf_fib_set_fwd_params(params, neigh, dev, mtu); 5534 } 5535 #endif 5536 5537 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 5538 struct bpf_fib_lookup *, params, int, plen, u32, flags) 5539 { 5540 if (plen < sizeof(*params)) 5541 return -EINVAL; 5542 5543 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 5544 return -EINVAL; 5545 5546 switch (params->family) { 5547 #if IS_ENABLED(CONFIG_INET) 5548 case AF_INET: 5549 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 5550 flags, true); 5551 #endif 5552 #if IS_ENABLED(CONFIG_IPV6) 5553 case AF_INET6: 5554 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 5555 flags, true); 5556 #endif 5557 } 5558 return -EAFNOSUPPORT; 5559 } 5560 5561 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 5562 .func = bpf_xdp_fib_lookup, 5563 .gpl_only = true, 5564 .ret_type = RET_INTEGER, 5565 .arg1_type = ARG_PTR_TO_CTX, 5566 .arg2_type = ARG_PTR_TO_MEM, 5567 .arg3_type = ARG_CONST_SIZE, 5568 .arg4_type = ARG_ANYTHING, 5569 }; 5570 5571 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 5572 struct bpf_fib_lookup *, params, int, plen, u32, flags) 5573 { 5574 struct net *net = dev_net(skb->dev); 5575 int rc = -EAFNOSUPPORT; 5576 bool check_mtu = false; 5577 5578 if (plen < sizeof(*params)) 5579 return -EINVAL; 5580 5581 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 5582 return -EINVAL; 5583 5584 if (params->tot_len) 5585 check_mtu = true; 5586 5587 switch (params->family) { 5588 #if IS_ENABLED(CONFIG_INET) 5589 case AF_INET: 5590 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu); 5591 break; 5592 #endif 5593 #if IS_ENABLED(CONFIG_IPV6) 5594 case AF_INET6: 5595 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu); 5596 break; 5597 #endif 5598 } 5599 5600 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) { 5601 struct net_device *dev; 5602 5603 /* When tot_len isn't provided by user, check skb 5604 * against MTU of FIB lookup resulting net_device 5605 */ 5606 dev = dev_get_by_index_rcu(net, params->ifindex); 5607 if (!is_skb_forwardable(dev, skb)) 5608 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 5609 5610 params->mtu_result = dev->mtu; /* union with tot_len */ 5611 } 5612 5613 return rc; 5614 } 5615 5616 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 5617 .func = bpf_skb_fib_lookup, 5618 .gpl_only = true, 5619 .ret_type = RET_INTEGER, 5620 .arg1_type = ARG_PTR_TO_CTX, 5621 .arg2_type = ARG_PTR_TO_MEM, 5622 .arg3_type = ARG_CONST_SIZE, 5623 .arg4_type = ARG_ANYTHING, 5624 }; 5625 5626 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr, 5627 u32 ifindex) 5628 { 5629 struct net *netns = dev_net(dev_curr); 5630 5631 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */ 5632 if (ifindex == 0) 5633 return dev_curr; 5634 5635 return dev_get_by_index_rcu(netns, ifindex); 5636 } 5637 5638 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb, 5639 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 5640 { 5641 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 5642 struct net_device *dev = skb->dev; 5643 int skb_len, dev_len; 5644 int mtu; 5645 5646 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS))) 5647 return -EINVAL; 5648 5649 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len))) 5650 return -EINVAL; 5651 5652 dev = __dev_via_ifindex(dev, ifindex); 5653 if (unlikely(!dev)) 5654 return -ENODEV; 5655 5656 mtu = READ_ONCE(dev->mtu); 5657 5658 dev_len = mtu + dev->hard_header_len; 5659 5660 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 5661 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len; 5662 5663 skb_len += len_diff; /* minus result pass check */ 5664 if (skb_len <= dev_len) { 5665 ret = BPF_MTU_CHK_RET_SUCCESS; 5666 goto out; 5667 } 5668 /* At this point, skb->len exceed MTU, but as it include length of all 5669 * segments, it can still be below MTU. The SKB can possibly get 5670 * re-segmented in transmit path (see validate_xmit_skb). Thus, user 5671 * must choose if segs are to be MTU checked. 5672 */ 5673 if (skb_is_gso(skb)) { 5674 ret = BPF_MTU_CHK_RET_SUCCESS; 5675 5676 if (flags & BPF_MTU_CHK_SEGS && 5677 !skb_gso_validate_network_len(skb, mtu)) 5678 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG; 5679 } 5680 out: 5681 /* BPF verifier guarantees valid pointer */ 5682 *mtu_len = mtu; 5683 5684 return ret; 5685 } 5686 5687 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp, 5688 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 5689 { 5690 struct net_device *dev = xdp->rxq->dev; 5691 int xdp_len = xdp->data_end - xdp->data; 5692 int ret = BPF_MTU_CHK_RET_SUCCESS; 5693 int mtu, dev_len; 5694 5695 /* XDP variant doesn't support multi-buffer segment check (yet) */ 5696 if (unlikely(flags)) 5697 return -EINVAL; 5698 5699 dev = __dev_via_ifindex(dev, ifindex); 5700 if (unlikely(!dev)) 5701 return -ENODEV; 5702 5703 mtu = READ_ONCE(dev->mtu); 5704 5705 /* Add L2-header as dev MTU is L3 size */ 5706 dev_len = mtu + dev->hard_header_len; 5707 5708 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 5709 if (*mtu_len) 5710 xdp_len = *mtu_len + dev->hard_header_len; 5711 5712 xdp_len += len_diff; /* minus result pass check */ 5713 if (xdp_len > dev_len) 5714 ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 5715 5716 /* BPF verifier guarantees valid pointer */ 5717 *mtu_len = mtu; 5718 5719 return ret; 5720 } 5721 5722 static const struct bpf_func_proto bpf_skb_check_mtu_proto = { 5723 .func = bpf_skb_check_mtu, 5724 .gpl_only = true, 5725 .ret_type = RET_INTEGER, 5726 .arg1_type = ARG_PTR_TO_CTX, 5727 .arg2_type = ARG_ANYTHING, 5728 .arg3_type = ARG_PTR_TO_INT, 5729 .arg4_type = ARG_ANYTHING, 5730 .arg5_type = ARG_ANYTHING, 5731 }; 5732 5733 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = { 5734 .func = bpf_xdp_check_mtu, 5735 .gpl_only = true, 5736 .ret_type = RET_INTEGER, 5737 .arg1_type = ARG_PTR_TO_CTX, 5738 .arg2_type = ARG_ANYTHING, 5739 .arg3_type = ARG_PTR_TO_INT, 5740 .arg4_type = ARG_ANYTHING, 5741 .arg5_type = ARG_ANYTHING, 5742 }; 5743 5744 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5745 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 5746 { 5747 int err; 5748 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 5749 5750 if (!seg6_validate_srh(srh, len, false)) 5751 return -EINVAL; 5752 5753 switch (type) { 5754 case BPF_LWT_ENCAP_SEG6_INLINE: 5755 if (skb->protocol != htons(ETH_P_IPV6)) 5756 return -EBADMSG; 5757 5758 err = seg6_do_srh_inline(skb, srh); 5759 break; 5760 case BPF_LWT_ENCAP_SEG6: 5761 skb_reset_inner_headers(skb); 5762 skb->encapsulation = 1; 5763 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 5764 break; 5765 default: 5766 return -EINVAL; 5767 } 5768 5769 bpf_compute_data_pointers(skb); 5770 if (err) 5771 return err; 5772 5773 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 5774 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 5775 5776 return seg6_lookup_nexthop(skb, NULL, 0); 5777 } 5778 #endif /* CONFIG_IPV6_SEG6_BPF */ 5779 5780 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 5781 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 5782 bool ingress) 5783 { 5784 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 5785 } 5786 #endif 5787 5788 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 5789 u32, len) 5790 { 5791 switch (type) { 5792 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5793 case BPF_LWT_ENCAP_SEG6: 5794 case BPF_LWT_ENCAP_SEG6_INLINE: 5795 return bpf_push_seg6_encap(skb, type, hdr, len); 5796 #endif 5797 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 5798 case BPF_LWT_ENCAP_IP: 5799 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 5800 #endif 5801 default: 5802 return -EINVAL; 5803 } 5804 } 5805 5806 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 5807 void *, hdr, u32, len) 5808 { 5809 switch (type) { 5810 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 5811 case BPF_LWT_ENCAP_IP: 5812 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 5813 #endif 5814 default: 5815 return -EINVAL; 5816 } 5817 } 5818 5819 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 5820 .func = bpf_lwt_in_push_encap, 5821 .gpl_only = false, 5822 .ret_type = RET_INTEGER, 5823 .arg1_type = ARG_PTR_TO_CTX, 5824 .arg2_type = ARG_ANYTHING, 5825 .arg3_type = ARG_PTR_TO_MEM, 5826 .arg4_type = ARG_CONST_SIZE 5827 }; 5828 5829 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 5830 .func = bpf_lwt_xmit_push_encap, 5831 .gpl_only = false, 5832 .ret_type = RET_INTEGER, 5833 .arg1_type = ARG_PTR_TO_CTX, 5834 .arg2_type = ARG_ANYTHING, 5835 .arg3_type = ARG_PTR_TO_MEM, 5836 .arg4_type = ARG_CONST_SIZE 5837 }; 5838 5839 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5840 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 5841 const void *, from, u32, len) 5842 { 5843 struct seg6_bpf_srh_state *srh_state = 5844 this_cpu_ptr(&seg6_bpf_srh_states); 5845 struct ipv6_sr_hdr *srh = srh_state->srh; 5846 void *srh_tlvs, *srh_end, *ptr; 5847 int srhoff = 0; 5848 5849 if (srh == NULL) 5850 return -EINVAL; 5851 5852 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 5853 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 5854 5855 ptr = skb->data + offset; 5856 if (ptr >= srh_tlvs && ptr + len <= srh_end) 5857 srh_state->valid = false; 5858 else if (ptr < (void *)&srh->flags || 5859 ptr + len > (void *)&srh->segments) 5860 return -EFAULT; 5861 5862 if (unlikely(bpf_try_make_writable(skb, offset + len))) 5863 return -EFAULT; 5864 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5865 return -EINVAL; 5866 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5867 5868 memcpy(skb->data + offset, from, len); 5869 return 0; 5870 } 5871 5872 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 5873 .func = bpf_lwt_seg6_store_bytes, 5874 .gpl_only = false, 5875 .ret_type = RET_INTEGER, 5876 .arg1_type = ARG_PTR_TO_CTX, 5877 .arg2_type = ARG_ANYTHING, 5878 .arg3_type = ARG_PTR_TO_MEM, 5879 .arg4_type = ARG_CONST_SIZE 5880 }; 5881 5882 static void bpf_update_srh_state(struct sk_buff *skb) 5883 { 5884 struct seg6_bpf_srh_state *srh_state = 5885 this_cpu_ptr(&seg6_bpf_srh_states); 5886 int srhoff = 0; 5887 5888 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 5889 srh_state->srh = NULL; 5890 } else { 5891 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5892 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 5893 srh_state->valid = true; 5894 } 5895 } 5896 5897 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 5898 u32, action, void *, param, u32, param_len) 5899 { 5900 struct seg6_bpf_srh_state *srh_state = 5901 this_cpu_ptr(&seg6_bpf_srh_states); 5902 int hdroff = 0; 5903 int err; 5904 5905 switch (action) { 5906 case SEG6_LOCAL_ACTION_END_X: 5907 if (!seg6_bpf_has_valid_srh(skb)) 5908 return -EBADMSG; 5909 if (param_len != sizeof(struct in6_addr)) 5910 return -EINVAL; 5911 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 5912 case SEG6_LOCAL_ACTION_END_T: 5913 if (!seg6_bpf_has_valid_srh(skb)) 5914 return -EBADMSG; 5915 if (param_len != sizeof(int)) 5916 return -EINVAL; 5917 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5918 case SEG6_LOCAL_ACTION_END_DT6: 5919 if (!seg6_bpf_has_valid_srh(skb)) 5920 return -EBADMSG; 5921 if (param_len != sizeof(int)) 5922 return -EINVAL; 5923 5924 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 5925 return -EBADMSG; 5926 if (!pskb_pull(skb, hdroff)) 5927 return -EBADMSG; 5928 5929 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 5930 skb_reset_network_header(skb); 5931 skb_reset_transport_header(skb); 5932 skb->encapsulation = 0; 5933 5934 bpf_compute_data_pointers(skb); 5935 bpf_update_srh_state(skb); 5936 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5937 case SEG6_LOCAL_ACTION_END_B6: 5938 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5939 return -EBADMSG; 5940 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 5941 param, param_len); 5942 if (!err) 5943 bpf_update_srh_state(skb); 5944 5945 return err; 5946 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 5947 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5948 return -EBADMSG; 5949 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 5950 param, param_len); 5951 if (!err) 5952 bpf_update_srh_state(skb); 5953 5954 return err; 5955 default: 5956 return -EINVAL; 5957 } 5958 } 5959 5960 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 5961 .func = bpf_lwt_seg6_action, 5962 .gpl_only = false, 5963 .ret_type = RET_INTEGER, 5964 .arg1_type = ARG_PTR_TO_CTX, 5965 .arg2_type = ARG_ANYTHING, 5966 .arg3_type = ARG_PTR_TO_MEM, 5967 .arg4_type = ARG_CONST_SIZE 5968 }; 5969 5970 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 5971 s32, len) 5972 { 5973 struct seg6_bpf_srh_state *srh_state = 5974 this_cpu_ptr(&seg6_bpf_srh_states); 5975 struct ipv6_sr_hdr *srh = srh_state->srh; 5976 void *srh_end, *srh_tlvs, *ptr; 5977 struct ipv6hdr *hdr; 5978 int srhoff = 0; 5979 int ret; 5980 5981 if (unlikely(srh == NULL)) 5982 return -EINVAL; 5983 5984 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 5985 ((srh->first_segment + 1) << 4)); 5986 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 5987 srh_state->hdrlen); 5988 ptr = skb->data + offset; 5989 5990 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 5991 return -EFAULT; 5992 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 5993 return -EFAULT; 5994 5995 if (len > 0) { 5996 ret = skb_cow_head(skb, len); 5997 if (unlikely(ret < 0)) 5998 return ret; 5999 6000 ret = bpf_skb_net_hdr_push(skb, offset, len); 6001 } else { 6002 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 6003 } 6004 6005 bpf_compute_data_pointers(skb); 6006 if (unlikely(ret < 0)) 6007 return ret; 6008 6009 hdr = (struct ipv6hdr *)skb->data; 6010 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 6011 6012 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6013 return -EINVAL; 6014 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6015 srh_state->hdrlen += len; 6016 srh_state->valid = false; 6017 return 0; 6018 } 6019 6020 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 6021 .func = bpf_lwt_seg6_adjust_srh, 6022 .gpl_only = false, 6023 .ret_type = RET_INTEGER, 6024 .arg1_type = ARG_PTR_TO_CTX, 6025 .arg2_type = ARG_ANYTHING, 6026 .arg3_type = ARG_ANYTHING, 6027 }; 6028 #endif /* CONFIG_IPV6_SEG6_BPF */ 6029 6030 #ifdef CONFIG_INET 6031 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 6032 int dif, int sdif, u8 family, u8 proto) 6033 { 6034 bool refcounted = false; 6035 struct sock *sk = NULL; 6036 6037 if (family == AF_INET) { 6038 __be32 src4 = tuple->ipv4.saddr; 6039 __be32 dst4 = tuple->ipv4.daddr; 6040 6041 if (proto == IPPROTO_TCP) 6042 sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, 6043 src4, tuple->ipv4.sport, 6044 dst4, tuple->ipv4.dport, 6045 dif, sdif, &refcounted); 6046 else 6047 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 6048 dst4, tuple->ipv4.dport, 6049 dif, sdif, &udp_table, NULL); 6050 #if IS_ENABLED(CONFIG_IPV6) 6051 } else { 6052 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 6053 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 6054 6055 if (proto == IPPROTO_TCP) 6056 sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, 6057 src6, tuple->ipv6.sport, 6058 dst6, ntohs(tuple->ipv6.dport), 6059 dif, sdif, &refcounted); 6060 else if (likely(ipv6_bpf_stub)) 6061 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 6062 src6, tuple->ipv6.sport, 6063 dst6, tuple->ipv6.dport, 6064 dif, sdif, 6065 &udp_table, NULL); 6066 #endif 6067 } 6068 6069 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 6070 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6071 sk = NULL; 6072 } 6073 return sk; 6074 } 6075 6076 /* bpf_skc_lookup performs the core lookup for different types of sockets, 6077 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 6078 * Returns the socket as an 'unsigned long' to simplify the casting in the 6079 * callers to satisfy BPF_CALL declarations. 6080 */ 6081 static struct sock * 6082 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6083 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6084 u64 flags) 6085 { 6086 struct sock *sk = NULL; 6087 u8 family = AF_UNSPEC; 6088 struct net *net; 6089 int sdif; 6090 6091 if (len == sizeof(tuple->ipv4)) 6092 family = AF_INET; 6093 else if (len == sizeof(tuple->ipv6)) 6094 family = AF_INET6; 6095 else 6096 return NULL; 6097 6098 if (unlikely(family == AF_UNSPEC || flags || 6099 !((s32)netns_id < 0 || netns_id <= S32_MAX))) 6100 goto out; 6101 6102 if (family == AF_INET) 6103 sdif = inet_sdif(skb); 6104 else 6105 sdif = inet6_sdif(skb); 6106 6107 if ((s32)netns_id < 0) { 6108 net = caller_net; 6109 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6110 } else { 6111 net = get_net_ns_by_id(caller_net, netns_id); 6112 if (unlikely(!net)) 6113 goto out; 6114 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6115 put_net(net); 6116 } 6117 6118 out: 6119 return sk; 6120 } 6121 6122 static struct sock * 6123 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6124 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6125 u64 flags) 6126 { 6127 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 6128 ifindex, proto, netns_id, flags); 6129 6130 if (sk) { 6131 sk = sk_to_full_sk(sk); 6132 if (!sk_fullsock(sk)) { 6133 sock_gen_put(sk); 6134 return NULL; 6135 } 6136 } 6137 6138 return sk; 6139 } 6140 6141 static struct sock * 6142 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6143 u8 proto, u64 netns_id, u64 flags) 6144 { 6145 struct net *caller_net; 6146 int ifindex; 6147 6148 if (skb->dev) { 6149 caller_net = dev_net(skb->dev); 6150 ifindex = skb->dev->ifindex; 6151 } else { 6152 caller_net = sock_net(skb->sk); 6153 ifindex = 0; 6154 } 6155 6156 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 6157 netns_id, flags); 6158 } 6159 6160 static struct sock * 6161 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6162 u8 proto, u64 netns_id, u64 flags) 6163 { 6164 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 6165 flags); 6166 6167 if (sk) { 6168 sk = sk_to_full_sk(sk); 6169 if (!sk_fullsock(sk)) { 6170 sock_gen_put(sk); 6171 return NULL; 6172 } 6173 } 6174 6175 return sk; 6176 } 6177 6178 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 6179 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6180 { 6181 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 6182 netns_id, flags); 6183 } 6184 6185 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 6186 .func = bpf_skc_lookup_tcp, 6187 .gpl_only = false, 6188 .pkt_access = true, 6189 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6190 .arg1_type = ARG_PTR_TO_CTX, 6191 .arg2_type = ARG_PTR_TO_MEM, 6192 .arg3_type = ARG_CONST_SIZE, 6193 .arg4_type = ARG_ANYTHING, 6194 .arg5_type = ARG_ANYTHING, 6195 }; 6196 6197 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 6198 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6199 { 6200 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 6201 netns_id, flags); 6202 } 6203 6204 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 6205 .func = bpf_sk_lookup_tcp, 6206 .gpl_only = false, 6207 .pkt_access = true, 6208 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6209 .arg1_type = ARG_PTR_TO_CTX, 6210 .arg2_type = ARG_PTR_TO_MEM, 6211 .arg3_type = ARG_CONST_SIZE, 6212 .arg4_type = ARG_ANYTHING, 6213 .arg5_type = ARG_ANYTHING, 6214 }; 6215 6216 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 6217 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6218 { 6219 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 6220 netns_id, flags); 6221 } 6222 6223 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 6224 .func = bpf_sk_lookup_udp, 6225 .gpl_only = false, 6226 .pkt_access = true, 6227 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6228 .arg1_type = ARG_PTR_TO_CTX, 6229 .arg2_type = ARG_PTR_TO_MEM, 6230 .arg3_type = ARG_CONST_SIZE, 6231 .arg4_type = ARG_ANYTHING, 6232 .arg5_type = ARG_ANYTHING, 6233 }; 6234 6235 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 6236 { 6237 if (sk && sk_is_refcounted(sk)) 6238 sock_gen_put(sk); 6239 return 0; 6240 } 6241 6242 static const struct bpf_func_proto bpf_sk_release_proto = { 6243 .func = bpf_sk_release, 6244 .gpl_only = false, 6245 .ret_type = RET_INTEGER, 6246 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 6247 }; 6248 6249 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 6250 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6251 { 6252 struct net *caller_net = dev_net(ctx->rxq->dev); 6253 int ifindex = ctx->rxq->dev->ifindex; 6254 6255 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6256 ifindex, IPPROTO_UDP, netns_id, 6257 flags); 6258 } 6259 6260 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 6261 .func = bpf_xdp_sk_lookup_udp, 6262 .gpl_only = false, 6263 .pkt_access = true, 6264 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6265 .arg1_type = ARG_PTR_TO_CTX, 6266 .arg2_type = ARG_PTR_TO_MEM, 6267 .arg3_type = ARG_CONST_SIZE, 6268 .arg4_type = ARG_ANYTHING, 6269 .arg5_type = ARG_ANYTHING, 6270 }; 6271 6272 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 6273 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6274 { 6275 struct net *caller_net = dev_net(ctx->rxq->dev); 6276 int ifindex = ctx->rxq->dev->ifindex; 6277 6278 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 6279 ifindex, IPPROTO_TCP, netns_id, 6280 flags); 6281 } 6282 6283 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 6284 .func = bpf_xdp_skc_lookup_tcp, 6285 .gpl_only = false, 6286 .pkt_access = true, 6287 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6288 .arg1_type = ARG_PTR_TO_CTX, 6289 .arg2_type = ARG_PTR_TO_MEM, 6290 .arg3_type = ARG_CONST_SIZE, 6291 .arg4_type = ARG_ANYTHING, 6292 .arg5_type = ARG_ANYTHING, 6293 }; 6294 6295 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 6296 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6297 { 6298 struct net *caller_net = dev_net(ctx->rxq->dev); 6299 int ifindex = ctx->rxq->dev->ifindex; 6300 6301 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6302 ifindex, IPPROTO_TCP, netns_id, 6303 flags); 6304 } 6305 6306 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 6307 .func = bpf_xdp_sk_lookup_tcp, 6308 .gpl_only = false, 6309 .pkt_access = true, 6310 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6311 .arg1_type = ARG_PTR_TO_CTX, 6312 .arg2_type = ARG_PTR_TO_MEM, 6313 .arg3_type = ARG_CONST_SIZE, 6314 .arg4_type = ARG_ANYTHING, 6315 .arg5_type = ARG_ANYTHING, 6316 }; 6317 6318 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6319 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6320 { 6321 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 6322 sock_net(ctx->sk), 0, 6323 IPPROTO_TCP, netns_id, flags); 6324 } 6325 6326 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 6327 .func = bpf_sock_addr_skc_lookup_tcp, 6328 .gpl_only = false, 6329 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6330 .arg1_type = ARG_PTR_TO_CTX, 6331 .arg2_type = ARG_PTR_TO_MEM, 6332 .arg3_type = ARG_CONST_SIZE, 6333 .arg4_type = ARG_ANYTHING, 6334 .arg5_type = ARG_ANYTHING, 6335 }; 6336 6337 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6338 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6339 { 6340 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6341 sock_net(ctx->sk), 0, IPPROTO_TCP, 6342 netns_id, flags); 6343 } 6344 6345 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 6346 .func = bpf_sock_addr_sk_lookup_tcp, 6347 .gpl_only = false, 6348 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6349 .arg1_type = ARG_PTR_TO_CTX, 6350 .arg2_type = ARG_PTR_TO_MEM, 6351 .arg3_type = ARG_CONST_SIZE, 6352 .arg4_type = ARG_ANYTHING, 6353 .arg5_type = ARG_ANYTHING, 6354 }; 6355 6356 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 6357 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6358 { 6359 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6360 sock_net(ctx->sk), 0, IPPROTO_UDP, 6361 netns_id, flags); 6362 } 6363 6364 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 6365 .func = bpf_sock_addr_sk_lookup_udp, 6366 .gpl_only = false, 6367 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6368 .arg1_type = ARG_PTR_TO_CTX, 6369 .arg2_type = ARG_PTR_TO_MEM, 6370 .arg3_type = ARG_CONST_SIZE, 6371 .arg4_type = ARG_ANYTHING, 6372 .arg5_type = ARG_ANYTHING, 6373 }; 6374 6375 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6376 struct bpf_insn_access_aux *info) 6377 { 6378 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 6379 icsk_retransmits)) 6380 return false; 6381 6382 if (off % size != 0) 6383 return false; 6384 6385 switch (off) { 6386 case offsetof(struct bpf_tcp_sock, bytes_received): 6387 case offsetof(struct bpf_tcp_sock, bytes_acked): 6388 return size == sizeof(__u64); 6389 default: 6390 return size == sizeof(__u32); 6391 } 6392 } 6393 6394 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 6395 const struct bpf_insn *si, 6396 struct bpf_insn *insn_buf, 6397 struct bpf_prog *prog, u32 *target_size) 6398 { 6399 struct bpf_insn *insn = insn_buf; 6400 6401 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 6402 do { \ 6403 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 6404 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 6405 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 6406 si->dst_reg, si->src_reg, \ 6407 offsetof(struct tcp_sock, FIELD)); \ 6408 } while (0) 6409 6410 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 6411 do { \ 6412 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 6413 FIELD) > \ 6414 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 6415 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 6416 struct inet_connection_sock, \ 6417 FIELD), \ 6418 si->dst_reg, si->src_reg, \ 6419 offsetof( \ 6420 struct inet_connection_sock, \ 6421 FIELD)); \ 6422 } while (0) 6423 6424 if (insn > insn_buf) 6425 return insn - insn_buf; 6426 6427 switch (si->off) { 6428 case offsetof(struct bpf_tcp_sock, rtt_min): 6429 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 6430 sizeof(struct minmax)); 6431 BUILD_BUG_ON(sizeof(struct minmax) < 6432 sizeof(struct minmax_sample)); 6433 6434 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 6435 offsetof(struct tcp_sock, rtt_min) + 6436 offsetof(struct minmax_sample, v)); 6437 break; 6438 case offsetof(struct bpf_tcp_sock, snd_cwnd): 6439 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 6440 break; 6441 case offsetof(struct bpf_tcp_sock, srtt_us): 6442 BPF_TCP_SOCK_GET_COMMON(srtt_us); 6443 break; 6444 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 6445 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 6446 break; 6447 case offsetof(struct bpf_tcp_sock, rcv_nxt): 6448 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 6449 break; 6450 case offsetof(struct bpf_tcp_sock, snd_nxt): 6451 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 6452 break; 6453 case offsetof(struct bpf_tcp_sock, snd_una): 6454 BPF_TCP_SOCK_GET_COMMON(snd_una); 6455 break; 6456 case offsetof(struct bpf_tcp_sock, mss_cache): 6457 BPF_TCP_SOCK_GET_COMMON(mss_cache); 6458 break; 6459 case offsetof(struct bpf_tcp_sock, ecn_flags): 6460 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 6461 break; 6462 case offsetof(struct bpf_tcp_sock, rate_delivered): 6463 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 6464 break; 6465 case offsetof(struct bpf_tcp_sock, rate_interval_us): 6466 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 6467 break; 6468 case offsetof(struct bpf_tcp_sock, packets_out): 6469 BPF_TCP_SOCK_GET_COMMON(packets_out); 6470 break; 6471 case offsetof(struct bpf_tcp_sock, retrans_out): 6472 BPF_TCP_SOCK_GET_COMMON(retrans_out); 6473 break; 6474 case offsetof(struct bpf_tcp_sock, total_retrans): 6475 BPF_TCP_SOCK_GET_COMMON(total_retrans); 6476 break; 6477 case offsetof(struct bpf_tcp_sock, segs_in): 6478 BPF_TCP_SOCK_GET_COMMON(segs_in); 6479 break; 6480 case offsetof(struct bpf_tcp_sock, data_segs_in): 6481 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 6482 break; 6483 case offsetof(struct bpf_tcp_sock, segs_out): 6484 BPF_TCP_SOCK_GET_COMMON(segs_out); 6485 break; 6486 case offsetof(struct bpf_tcp_sock, data_segs_out): 6487 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 6488 break; 6489 case offsetof(struct bpf_tcp_sock, lost_out): 6490 BPF_TCP_SOCK_GET_COMMON(lost_out); 6491 break; 6492 case offsetof(struct bpf_tcp_sock, sacked_out): 6493 BPF_TCP_SOCK_GET_COMMON(sacked_out); 6494 break; 6495 case offsetof(struct bpf_tcp_sock, bytes_received): 6496 BPF_TCP_SOCK_GET_COMMON(bytes_received); 6497 break; 6498 case offsetof(struct bpf_tcp_sock, bytes_acked): 6499 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 6500 break; 6501 case offsetof(struct bpf_tcp_sock, dsack_dups): 6502 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 6503 break; 6504 case offsetof(struct bpf_tcp_sock, delivered): 6505 BPF_TCP_SOCK_GET_COMMON(delivered); 6506 break; 6507 case offsetof(struct bpf_tcp_sock, delivered_ce): 6508 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 6509 break; 6510 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 6511 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 6512 break; 6513 } 6514 6515 return insn - insn_buf; 6516 } 6517 6518 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 6519 { 6520 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 6521 return (unsigned long)sk; 6522 6523 return (unsigned long)NULL; 6524 } 6525 6526 const struct bpf_func_proto bpf_tcp_sock_proto = { 6527 .func = bpf_tcp_sock, 6528 .gpl_only = false, 6529 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 6530 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 6531 }; 6532 6533 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 6534 { 6535 sk = sk_to_full_sk(sk); 6536 6537 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 6538 return (unsigned long)sk; 6539 6540 return (unsigned long)NULL; 6541 } 6542 6543 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 6544 .func = bpf_get_listener_sock, 6545 .gpl_only = false, 6546 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6547 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 6548 }; 6549 6550 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 6551 { 6552 unsigned int iphdr_len; 6553 6554 switch (skb_protocol(skb, true)) { 6555 case cpu_to_be16(ETH_P_IP): 6556 iphdr_len = sizeof(struct iphdr); 6557 break; 6558 case cpu_to_be16(ETH_P_IPV6): 6559 iphdr_len = sizeof(struct ipv6hdr); 6560 break; 6561 default: 6562 return 0; 6563 } 6564 6565 if (skb_headlen(skb) < iphdr_len) 6566 return 0; 6567 6568 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 6569 return 0; 6570 6571 return INET_ECN_set_ce(skb); 6572 } 6573 6574 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6575 struct bpf_insn_access_aux *info) 6576 { 6577 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 6578 return false; 6579 6580 if (off % size != 0) 6581 return false; 6582 6583 switch (off) { 6584 default: 6585 return size == sizeof(__u32); 6586 } 6587 } 6588 6589 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 6590 const struct bpf_insn *si, 6591 struct bpf_insn *insn_buf, 6592 struct bpf_prog *prog, u32 *target_size) 6593 { 6594 struct bpf_insn *insn = insn_buf; 6595 6596 #define BPF_XDP_SOCK_GET(FIELD) \ 6597 do { \ 6598 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 6599 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 6600 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 6601 si->dst_reg, si->src_reg, \ 6602 offsetof(struct xdp_sock, FIELD)); \ 6603 } while (0) 6604 6605 switch (si->off) { 6606 case offsetof(struct bpf_xdp_sock, queue_id): 6607 BPF_XDP_SOCK_GET(queue_id); 6608 break; 6609 } 6610 6611 return insn - insn_buf; 6612 } 6613 6614 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 6615 .func = bpf_skb_ecn_set_ce, 6616 .gpl_only = false, 6617 .ret_type = RET_INTEGER, 6618 .arg1_type = ARG_PTR_TO_CTX, 6619 }; 6620 6621 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 6622 struct tcphdr *, th, u32, th_len) 6623 { 6624 #ifdef CONFIG_SYN_COOKIES 6625 u32 cookie; 6626 int ret; 6627 6628 if (unlikely(!sk || th_len < sizeof(*th))) 6629 return -EINVAL; 6630 6631 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 6632 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 6633 return -EINVAL; 6634 6635 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 6636 return -EINVAL; 6637 6638 if (!th->ack || th->rst || th->syn) 6639 return -ENOENT; 6640 6641 if (tcp_synq_no_recent_overflow(sk)) 6642 return -ENOENT; 6643 6644 cookie = ntohl(th->ack_seq) - 1; 6645 6646 switch (sk->sk_family) { 6647 case AF_INET: 6648 if (unlikely(iph_len < sizeof(struct iphdr))) 6649 return -EINVAL; 6650 6651 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 6652 break; 6653 6654 #if IS_BUILTIN(CONFIG_IPV6) 6655 case AF_INET6: 6656 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 6657 return -EINVAL; 6658 6659 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 6660 break; 6661 #endif /* CONFIG_IPV6 */ 6662 6663 default: 6664 return -EPROTONOSUPPORT; 6665 } 6666 6667 if (ret > 0) 6668 return 0; 6669 6670 return -ENOENT; 6671 #else 6672 return -ENOTSUPP; 6673 #endif 6674 } 6675 6676 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 6677 .func = bpf_tcp_check_syncookie, 6678 .gpl_only = true, 6679 .pkt_access = true, 6680 .ret_type = RET_INTEGER, 6681 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 6682 .arg2_type = ARG_PTR_TO_MEM, 6683 .arg3_type = ARG_CONST_SIZE, 6684 .arg4_type = ARG_PTR_TO_MEM, 6685 .arg5_type = ARG_CONST_SIZE, 6686 }; 6687 6688 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 6689 struct tcphdr *, th, u32, th_len) 6690 { 6691 #ifdef CONFIG_SYN_COOKIES 6692 u32 cookie; 6693 u16 mss; 6694 6695 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4)) 6696 return -EINVAL; 6697 6698 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 6699 return -EINVAL; 6700 6701 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 6702 return -ENOENT; 6703 6704 if (!th->syn || th->ack || th->fin || th->rst) 6705 return -EINVAL; 6706 6707 if (unlikely(iph_len < sizeof(struct iphdr))) 6708 return -EINVAL; 6709 6710 /* Both struct iphdr and struct ipv6hdr have the version field at the 6711 * same offset so we can cast to the shorter header (struct iphdr). 6712 */ 6713 switch (((struct iphdr *)iph)->version) { 6714 case 4: 6715 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only) 6716 return -EINVAL; 6717 6718 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 6719 break; 6720 6721 #if IS_BUILTIN(CONFIG_IPV6) 6722 case 6: 6723 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 6724 return -EINVAL; 6725 6726 if (sk->sk_family != AF_INET6) 6727 return -EINVAL; 6728 6729 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 6730 break; 6731 #endif /* CONFIG_IPV6 */ 6732 6733 default: 6734 return -EPROTONOSUPPORT; 6735 } 6736 if (mss == 0) 6737 return -ENOENT; 6738 6739 return cookie | ((u64)mss << 32); 6740 #else 6741 return -EOPNOTSUPP; 6742 #endif /* CONFIG_SYN_COOKIES */ 6743 } 6744 6745 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 6746 .func = bpf_tcp_gen_syncookie, 6747 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 6748 .pkt_access = true, 6749 .ret_type = RET_INTEGER, 6750 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 6751 .arg2_type = ARG_PTR_TO_MEM, 6752 .arg3_type = ARG_CONST_SIZE, 6753 .arg4_type = ARG_PTR_TO_MEM, 6754 .arg5_type = ARG_CONST_SIZE, 6755 }; 6756 6757 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) 6758 { 6759 if (!sk || flags != 0) 6760 return -EINVAL; 6761 if (!skb_at_tc_ingress(skb)) 6762 return -EOPNOTSUPP; 6763 if (unlikely(dev_net(skb->dev) != sock_net(sk))) 6764 return -ENETUNREACH; 6765 if (unlikely(sk_fullsock(sk) && sk->sk_reuseport)) 6766 return -ESOCKTNOSUPPORT; 6767 if (sk_is_refcounted(sk) && 6768 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 6769 return -ENOENT; 6770 6771 skb_orphan(skb); 6772 skb->sk = sk; 6773 skb->destructor = sock_pfree; 6774 6775 return 0; 6776 } 6777 6778 static const struct bpf_func_proto bpf_sk_assign_proto = { 6779 .func = bpf_sk_assign, 6780 .gpl_only = false, 6781 .ret_type = RET_INTEGER, 6782 .arg1_type = ARG_PTR_TO_CTX, 6783 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 6784 .arg3_type = ARG_ANYTHING, 6785 }; 6786 6787 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend, 6788 u8 search_kind, const u8 *magic, 6789 u8 magic_len, bool *eol) 6790 { 6791 u8 kind, kind_len; 6792 6793 *eol = false; 6794 6795 while (op < opend) { 6796 kind = op[0]; 6797 6798 if (kind == TCPOPT_EOL) { 6799 *eol = true; 6800 return ERR_PTR(-ENOMSG); 6801 } else if (kind == TCPOPT_NOP) { 6802 op++; 6803 continue; 6804 } 6805 6806 if (opend - op < 2 || opend - op < op[1] || op[1] < 2) 6807 /* Something is wrong in the received header. 6808 * Follow the TCP stack's tcp_parse_options() 6809 * and just bail here. 6810 */ 6811 return ERR_PTR(-EFAULT); 6812 6813 kind_len = op[1]; 6814 if (search_kind == kind) { 6815 if (!magic_len) 6816 return op; 6817 6818 if (magic_len > kind_len - 2) 6819 return ERR_PTR(-ENOMSG); 6820 6821 if (!memcmp(&op[2], magic, magic_len)) 6822 return op; 6823 } 6824 6825 op += kind_len; 6826 } 6827 6828 return ERR_PTR(-ENOMSG); 6829 } 6830 6831 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 6832 void *, search_res, u32, len, u64, flags) 6833 { 6834 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN; 6835 const u8 *op, *opend, *magic, *search = search_res; 6836 u8 search_kind, search_len, copy_len, magic_len; 6837 int ret; 6838 6839 /* 2 byte is the minimal option len except TCPOPT_NOP and 6840 * TCPOPT_EOL which are useless for the bpf prog to learn 6841 * and this helper disallow loading them also. 6842 */ 6843 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN) 6844 return -EINVAL; 6845 6846 search_kind = search[0]; 6847 search_len = search[1]; 6848 6849 if (search_len > len || search_kind == TCPOPT_NOP || 6850 search_kind == TCPOPT_EOL) 6851 return -EINVAL; 6852 6853 if (search_kind == TCPOPT_EXP || search_kind == 253) { 6854 /* 16 or 32 bit magic. +2 for kind and kind length */ 6855 if (search_len != 4 && search_len != 6) 6856 return -EINVAL; 6857 magic = &search[2]; 6858 magic_len = search_len - 2; 6859 } else { 6860 if (search_len) 6861 return -EINVAL; 6862 magic = NULL; 6863 magic_len = 0; 6864 } 6865 6866 if (load_syn) { 6867 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op); 6868 if (ret < 0) 6869 return ret; 6870 6871 opend = op + ret; 6872 op += sizeof(struct tcphdr); 6873 } else { 6874 if (!bpf_sock->skb || 6875 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB) 6876 /* This bpf_sock->op cannot call this helper */ 6877 return -EPERM; 6878 6879 opend = bpf_sock->skb_data_end; 6880 op = bpf_sock->skb->data + sizeof(struct tcphdr); 6881 } 6882 6883 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len, 6884 &eol); 6885 if (IS_ERR(op)) 6886 return PTR_ERR(op); 6887 6888 copy_len = op[1]; 6889 ret = copy_len; 6890 if (copy_len > len) { 6891 ret = -ENOSPC; 6892 copy_len = len; 6893 } 6894 6895 memcpy(search_res, op, copy_len); 6896 return ret; 6897 } 6898 6899 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = { 6900 .func = bpf_sock_ops_load_hdr_opt, 6901 .gpl_only = false, 6902 .ret_type = RET_INTEGER, 6903 .arg1_type = ARG_PTR_TO_CTX, 6904 .arg2_type = ARG_PTR_TO_MEM, 6905 .arg3_type = ARG_CONST_SIZE, 6906 .arg4_type = ARG_ANYTHING, 6907 }; 6908 6909 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 6910 const void *, from, u32, len, u64, flags) 6911 { 6912 u8 new_kind, new_kind_len, magic_len = 0, *opend; 6913 const u8 *op, *new_op, *magic = NULL; 6914 struct sk_buff *skb; 6915 bool eol; 6916 6917 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB) 6918 return -EPERM; 6919 6920 if (len < 2 || flags) 6921 return -EINVAL; 6922 6923 new_op = from; 6924 new_kind = new_op[0]; 6925 new_kind_len = new_op[1]; 6926 6927 if (new_kind_len > len || new_kind == TCPOPT_NOP || 6928 new_kind == TCPOPT_EOL) 6929 return -EINVAL; 6930 6931 if (new_kind_len > bpf_sock->remaining_opt_len) 6932 return -ENOSPC; 6933 6934 /* 253 is another experimental kind */ 6935 if (new_kind == TCPOPT_EXP || new_kind == 253) { 6936 if (new_kind_len < 4) 6937 return -EINVAL; 6938 /* Match for the 2 byte magic also. 6939 * RFC 6994: the magic could be 2 or 4 bytes. 6940 * Hence, matching by 2 byte only is on the 6941 * conservative side but it is the right 6942 * thing to do for the 'search-for-duplication' 6943 * purpose. 6944 */ 6945 magic = &new_op[2]; 6946 magic_len = 2; 6947 } 6948 6949 /* Check for duplication */ 6950 skb = bpf_sock->skb; 6951 op = skb->data + sizeof(struct tcphdr); 6952 opend = bpf_sock->skb_data_end; 6953 6954 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len, 6955 &eol); 6956 if (!IS_ERR(op)) 6957 return -EEXIST; 6958 6959 if (PTR_ERR(op) != -ENOMSG) 6960 return PTR_ERR(op); 6961 6962 if (eol) 6963 /* The option has been ended. Treat it as no more 6964 * header option can be written. 6965 */ 6966 return -ENOSPC; 6967 6968 /* No duplication found. Store the header option. */ 6969 memcpy(opend, from, new_kind_len); 6970 6971 bpf_sock->remaining_opt_len -= new_kind_len; 6972 bpf_sock->skb_data_end += new_kind_len; 6973 6974 return 0; 6975 } 6976 6977 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = { 6978 .func = bpf_sock_ops_store_hdr_opt, 6979 .gpl_only = false, 6980 .ret_type = RET_INTEGER, 6981 .arg1_type = ARG_PTR_TO_CTX, 6982 .arg2_type = ARG_PTR_TO_MEM, 6983 .arg3_type = ARG_CONST_SIZE, 6984 .arg4_type = ARG_ANYTHING, 6985 }; 6986 6987 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 6988 u32, len, u64, flags) 6989 { 6990 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB) 6991 return -EPERM; 6992 6993 if (flags || len < 2) 6994 return -EINVAL; 6995 6996 if (len > bpf_sock->remaining_opt_len) 6997 return -ENOSPC; 6998 6999 bpf_sock->remaining_opt_len -= len; 7000 7001 return 0; 7002 } 7003 7004 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = { 7005 .func = bpf_sock_ops_reserve_hdr_opt, 7006 .gpl_only = false, 7007 .ret_type = RET_INTEGER, 7008 .arg1_type = ARG_PTR_TO_CTX, 7009 .arg2_type = ARG_ANYTHING, 7010 .arg3_type = ARG_ANYTHING, 7011 }; 7012 7013 #endif /* CONFIG_INET */ 7014 7015 bool bpf_helper_changes_pkt_data(void *func) 7016 { 7017 if (func == bpf_skb_vlan_push || 7018 func == bpf_skb_vlan_pop || 7019 func == bpf_skb_store_bytes || 7020 func == bpf_skb_change_proto || 7021 func == bpf_skb_change_head || 7022 func == sk_skb_change_head || 7023 func == bpf_skb_change_tail || 7024 func == sk_skb_change_tail || 7025 func == bpf_skb_adjust_room || 7026 func == sk_skb_adjust_room || 7027 func == bpf_skb_pull_data || 7028 func == sk_skb_pull_data || 7029 func == bpf_clone_redirect || 7030 func == bpf_l3_csum_replace || 7031 func == bpf_l4_csum_replace || 7032 func == bpf_xdp_adjust_head || 7033 func == bpf_xdp_adjust_meta || 7034 func == bpf_msg_pull_data || 7035 func == bpf_msg_push_data || 7036 func == bpf_msg_pop_data || 7037 func == bpf_xdp_adjust_tail || 7038 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7039 func == bpf_lwt_seg6_store_bytes || 7040 func == bpf_lwt_seg6_adjust_srh || 7041 func == bpf_lwt_seg6_action || 7042 #endif 7043 #ifdef CONFIG_INET 7044 func == bpf_sock_ops_store_hdr_opt || 7045 #endif 7046 func == bpf_lwt_in_push_encap || 7047 func == bpf_lwt_xmit_push_encap) 7048 return true; 7049 7050 return false; 7051 } 7052 7053 const struct bpf_func_proto bpf_event_output_data_proto __weak; 7054 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; 7055 7056 static const struct bpf_func_proto * 7057 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7058 { 7059 switch (func_id) { 7060 /* inet and inet6 sockets are created in a process 7061 * context so there is always a valid uid/gid 7062 */ 7063 case BPF_FUNC_get_current_uid_gid: 7064 return &bpf_get_current_uid_gid_proto; 7065 case BPF_FUNC_get_local_storage: 7066 return &bpf_get_local_storage_proto; 7067 case BPF_FUNC_get_socket_cookie: 7068 return &bpf_get_socket_cookie_sock_proto; 7069 case BPF_FUNC_get_netns_cookie: 7070 return &bpf_get_netns_cookie_sock_proto; 7071 case BPF_FUNC_perf_event_output: 7072 return &bpf_event_output_data_proto; 7073 case BPF_FUNC_get_current_pid_tgid: 7074 return &bpf_get_current_pid_tgid_proto; 7075 case BPF_FUNC_get_current_comm: 7076 return &bpf_get_current_comm_proto; 7077 #ifdef CONFIG_CGROUPS 7078 case BPF_FUNC_get_current_cgroup_id: 7079 return &bpf_get_current_cgroup_id_proto; 7080 case BPF_FUNC_get_current_ancestor_cgroup_id: 7081 return &bpf_get_current_ancestor_cgroup_id_proto; 7082 #endif 7083 #ifdef CONFIG_CGROUP_NET_CLASSID 7084 case BPF_FUNC_get_cgroup_classid: 7085 return &bpf_get_cgroup_classid_curr_proto; 7086 #endif 7087 case BPF_FUNC_sk_storage_get: 7088 return &bpf_sk_storage_get_cg_sock_proto; 7089 default: 7090 return bpf_base_func_proto(func_id); 7091 } 7092 } 7093 7094 static const struct bpf_func_proto * 7095 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7096 { 7097 switch (func_id) { 7098 /* inet and inet6 sockets are created in a process 7099 * context so there is always a valid uid/gid 7100 */ 7101 case BPF_FUNC_get_current_uid_gid: 7102 return &bpf_get_current_uid_gid_proto; 7103 case BPF_FUNC_bind: 7104 switch (prog->expected_attach_type) { 7105 case BPF_CGROUP_INET4_CONNECT: 7106 case BPF_CGROUP_INET6_CONNECT: 7107 return &bpf_bind_proto; 7108 default: 7109 return NULL; 7110 } 7111 case BPF_FUNC_get_socket_cookie: 7112 return &bpf_get_socket_cookie_sock_addr_proto; 7113 case BPF_FUNC_get_netns_cookie: 7114 return &bpf_get_netns_cookie_sock_addr_proto; 7115 case BPF_FUNC_get_local_storage: 7116 return &bpf_get_local_storage_proto; 7117 case BPF_FUNC_perf_event_output: 7118 return &bpf_event_output_data_proto; 7119 case BPF_FUNC_get_current_pid_tgid: 7120 return &bpf_get_current_pid_tgid_proto; 7121 case BPF_FUNC_get_current_comm: 7122 return &bpf_get_current_comm_proto; 7123 #ifdef CONFIG_CGROUPS 7124 case BPF_FUNC_get_current_cgroup_id: 7125 return &bpf_get_current_cgroup_id_proto; 7126 case BPF_FUNC_get_current_ancestor_cgroup_id: 7127 return &bpf_get_current_ancestor_cgroup_id_proto; 7128 #endif 7129 #ifdef CONFIG_CGROUP_NET_CLASSID 7130 case BPF_FUNC_get_cgroup_classid: 7131 return &bpf_get_cgroup_classid_curr_proto; 7132 #endif 7133 #ifdef CONFIG_INET 7134 case BPF_FUNC_sk_lookup_tcp: 7135 return &bpf_sock_addr_sk_lookup_tcp_proto; 7136 case BPF_FUNC_sk_lookup_udp: 7137 return &bpf_sock_addr_sk_lookup_udp_proto; 7138 case BPF_FUNC_sk_release: 7139 return &bpf_sk_release_proto; 7140 case BPF_FUNC_skc_lookup_tcp: 7141 return &bpf_sock_addr_skc_lookup_tcp_proto; 7142 #endif /* CONFIG_INET */ 7143 case BPF_FUNC_sk_storage_get: 7144 return &bpf_sk_storage_get_proto; 7145 case BPF_FUNC_sk_storage_delete: 7146 return &bpf_sk_storage_delete_proto; 7147 case BPF_FUNC_setsockopt: 7148 switch (prog->expected_attach_type) { 7149 case BPF_CGROUP_INET4_BIND: 7150 case BPF_CGROUP_INET6_BIND: 7151 case BPF_CGROUP_INET4_CONNECT: 7152 case BPF_CGROUP_INET6_CONNECT: 7153 case BPF_CGROUP_UDP4_RECVMSG: 7154 case BPF_CGROUP_UDP6_RECVMSG: 7155 case BPF_CGROUP_UDP4_SENDMSG: 7156 case BPF_CGROUP_UDP6_SENDMSG: 7157 case BPF_CGROUP_INET4_GETPEERNAME: 7158 case BPF_CGROUP_INET6_GETPEERNAME: 7159 case BPF_CGROUP_INET4_GETSOCKNAME: 7160 case BPF_CGROUP_INET6_GETSOCKNAME: 7161 return &bpf_sock_addr_setsockopt_proto; 7162 default: 7163 return NULL; 7164 } 7165 case BPF_FUNC_getsockopt: 7166 switch (prog->expected_attach_type) { 7167 case BPF_CGROUP_INET4_BIND: 7168 case BPF_CGROUP_INET6_BIND: 7169 case BPF_CGROUP_INET4_CONNECT: 7170 case BPF_CGROUP_INET6_CONNECT: 7171 case BPF_CGROUP_UDP4_RECVMSG: 7172 case BPF_CGROUP_UDP6_RECVMSG: 7173 case BPF_CGROUP_UDP4_SENDMSG: 7174 case BPF_CGROUP_UDP6_SENDMSG: 7175 case BPF_CGROUP_INET4_GETPEERNAME: 7176 case BPF_CGROUP_INET6_GETPEERNAME: 7177 case BPF_CGROUP_INET4_GETSOCKNAME: 7178 case BPF_CGROUP_INET6_GETSOCKNAME: 7179 return &bpf_sock_addr_getsockopt_proto; 7180 default: 7181 return NULL; 7182 } 7183 default: 7184 return bpf_sk_base_func_proto(func_id); 7185 } 7186 } 7187 7188 static const struct bpf_func_proto * 7189 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7190 { 7191 switch (func_id) { 7192 case BPF_FUNC_skb_load_bytes: 7193 return &bpf_skb_load_bytes_proto; 7194 case BPF_FUNC_skb_load_bytes_relative: 7195 return &bpf_skb_load_bytes_relative_proto; 7196 case BPF_FUNC_get_socket_cookie: 7197 return &bpf_get_socket_cookie_proto; 7198 case BPF_FUNC_get_socket_uid: 7199 return &bpf_get_socket_uid_proto; 7200 case BPF_FUNC_perf_event_output: 7201 return &bpf_skb_event_output_proto; 7202 default: 7203 return bpf_sk_base_func_proto(func_id); 7204 } 7205 } 7206 7207 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 7208 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 7209 7210 static const struct bpf_func_proto * 7211 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7212 { 7213 switch (func_id) { 7214 case BPF_FUNC_get_local_storage: 7215 return &bpf_get_local_storage_proto; 7216 case BPF_FUNC_sk_fullsock: 7217 return &bpf_sk_fullsock_proto; 7218 case BPF_FUNC_sk_storage_get: 7219 return &bpf_sk_storage_get_proto; 7220 case BPF_FUNC_sk_storage_delete: 7221 return &bpf_sk_storage_delete_proto; 7222 case BPF_FUNC_perf_event_output: 7223 return &bpf_skb_event_output_proto; 7224 #ifdef CONFIG_SOCK_CGROUP_DATA 7225 case BPF_FUNC_skb_cgroup_id: 7226 return &bpf_skb_cgroup_id_proto; 7227 case BPF_FUNC_skb_ancestor_cgroup_id: 7228 return &bpf_skb_ancestor_cgroup_id_proto; 7229 case BPF_FUNC_sk_cgroup_id: 7230 return &bpf_sk_cgroup_id_proto; 7231 case BPF_FUNC_sk_ancestor_cgroup_id: 7232 return &bpf_sk_ancestor_cgroup_id_proto; 7233 #endif 7234 #ifdef CONFIG_INET 7235 case BPF_FUNC_sk_lookup_tcp: 7236 return &bpf_sk_lookup_tcp_proto; 7237 case BPF_FUNC_sk_lookup_udp: 7238 return &bpf_sk_lookup_udp_proto; 7239 case BPF_FUNC_sk_release: 7240 return &bpf_sk_release_proto; 7241 case BPF_FUNC_skc_lookup_tcp: 7242 return &bpf_skc_lookup_tcp_proto; 7243 case BPF_FUNC_tcp_sock: 7244 return &bpf_tcp_sock_proto; 7245 case BPF_FUNC_get_listener_sock: 7246 return &bpf_get_listener_sock_proto; 7247 case BPF_FUNC_skb_ecn_set_ce: 7248 return &bpf_skb_ecn_set_ce_proto; 7249 #endif 7250 default: 7251 return sk_filter_func_proto(func_id, prog); 7252 } 7253 } 7254 7255 static const struct bpf_func_proto * 7256 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7257 { 7258 switch (func_id) { 7259 case BPF_FUNC_skb_store_bytes: 7260 return &bpf_skb_store_bytes_proto; 7261 case BPF_FUNC_skb_load_bytes: 7262 return &bpf_skb_load_bytes_proto; 7263 case BPF_FUNC_skb_load_bytes_relative: 7264 return &bpf_skb_load_bytes_relative_proto; 7265 case BPF_FUNC_skb_pull_data: 7266 return &bpf_skb_pull_data_proto; 7267 case BPF_FUNC_csum_diff: 7268 return &bpf_csum_diff_proto; 7269 case BPF_FUNC_csum_update: 7270 return &bpf_csum_update_proto; 7271 case BPF_FUNC_csum_level: 7272 return &bpf_csum_level_proto; 7273 case BPF_FUNC_l3_csum_replace: 7274 return &bpf_l3_csum_replace_proto; 7275 case BPF_FUNC_l4_csum_replace: 7276 return &bpf_l4_csum_replace_proto; 7277 case BPF_FUNC_clone_redirect: 7278 return &bpf_clone_redirect_proto; 7279 case BPF_FUNC_get_cgroup_classid: 7280 return &bpf_get_cgroup_classid_proto; 7281 case BPF_FUNC_skb_vlan_push: 7282 return &bpf_skb_vlan_push_proto; 7283 case BPF_FUNC_skb_vlan_pop: 7284 return &bpf_skb_vlan_pop_proto; 7285 case BPF_FUNC_skb_change_proto: 7286 return &bpf_skb_change_proto_proto; 7287 case BPF_FUNC_skb_change_type: 7288 return &bpf_skb_change_type_proto; 7289 case BPF_FUNC_skb_adjust_room: 7290 return &bpf_skb_adjust_room_proto; 7291 case BPF_FUNC_skb_change_tail: 7292 return &bpf_skb_change_tail_proto; 7293 case BPF_FUNC_skb_change_head: 7294 return &bpf_skb_change_head_proto; 7295 case BPF_FUNC_skb_get_tunnel_key: 7296 return &bpf_skb_get_tunnel_key_proto; 7297 case BPF_FUNC_skb_set_tunnel_key: 7298 return bpf_get_skb_set_tunnel_proto(func_id); 7299 case BPF_FUNC_skb_get_tunnel_opt: 7300 return &bpf_skb_get_tunnel_opt_proto; 7301 case BPF_FUNC_skb_set_tunnel_opt: 7302 return bpf_get_skb_set_tunnel_proto(func_id); 7303 case BPF_FUNC_redirect: 7304 return &bpf_redirect_proto; 7305 case BPF_FUNC_redirect_neigh: 7306 return &bpf_redirect_neigh_proto; 7307 case BPF_FUNC_redirect_peer: 7308 return &bpf_redirect_peer_proto; 7309 case BPF_FUNC_get_route_realm: 7310 return &bpf_get_route_realm_proto; 7311 case BPF_FUNC_get_hash_recalc: 7312 return &bpf_get_hash_recalc_proto; 7313 case BPF_FUNC_set_hash_invalid: 7314 return &bpf_set_hash_invalid_proto; 7315 case BPF_FUNC_set_hash: 7316 return &bpf_set_hash_proto; 7317 case BPF_FUNC_perf_event_output: 7318 return &bpf_skb_event_output_proto; 7319 case BPF_FUNC_get_smp_processor_id: 7320 return &bpf_get_smp_processor_id_proto; 7321 case BPF_FUNC_skb_under_cgroup: 7322 return &bpf_skb_under_cgroup_proto; 7323 case BPF_FUNC_get_socket_cookie: 7324 return &bpf_get_socket_cookie_proto; 7325 case BPF_FUNC_get_socket_uid: 7326 return &bpf_get_socket_uid_proto; 7327 case BPF_FUNC_fib_lookup: 7328 return &bpf_skb_fib_lookup_proto; 7329 case BPF_FUNC_check_mtu: 7330 return &bpf_skb_check_mtu_proto; 7331 case BPF_FUNC_sk_fullsock: 7332 return &bpf_sk_fullsock_proto; 7333 case BPF_FUNC_sk_storage_get: 7334 return &bpf_sk_storage_get_proto; 7335 case BPF_FUNC_sk_storage_delete: 7336 return &bpf_sk_storage_delete_proto; 7337 #ifdef CONFIG_XFRM 7338 case BPF_FUNC_skb_get_xfrm_state: 7339 return &bpf_skb_get_xfrm_state_proto; 7340 #endif 7341 #ifdef CONFIG_CGROUP_NET_CLASSID 7342 case BPF_FUNC_skb_cgroup_classid: 7343 return &bpf_skb_cgroup_classid_proto; 7344 #endif 7345 #ifdef CONFIG_SOCK_CGROUP_DATA 7346 case BPF_FUNC_skb_cgroup_id: 7347 return &bpf_skb_cgroup_id_proto; 7348 case BPF_FUNC_skb_ancestor_cgroup_id: 7349 return &bpf_skb_ancestor_cgroup_id_proto; 7350 #endif 7351 #ifdef CONFIG_INET 7352 case BPF_FUNC_sk_lookup_tcp: 7353 return &bpf_sk_lookup_tcp_proto; 7354 case BPF_FUNC_sk_lookup_udp: 7355 return &bpf_sk_lookup_udp_proto; 7356 case BPF_FUNC_sk_release: 7357 return &bpf_sk_release_proto; 7358 case BPF_FUNC_tcp_sock: 7359 return &bpf_tcp_sock_proto; 7360 case BPF_FUNC_get_listener_sock: 7361 return &bpf_get_listener_sock_proto; 7362 case BPF_FUNC_skc_lookup_tcp: 7363 return &bpf_skc_lookup_tcp_proto; 7364 case BPF_FUNC_tcp_check_syncookie: 7365 return &bpf_tcp_check_syncookie_proto; 7366 case BPF_FUNC_skb_ecn_set_ce: 7367 return &bpf_skb_ecn_set_ce_proto; 7368 case BPF_FUNC_tcp_gen_syncookie: 7369 return &bpf_tcp_gen_syncookie_proto; 7370 case BPF_FUNC_sk_assign: 7371 return &bpf_sk_assign_proto; 7372 #endif 7373 default: 7374 return bpf_sk_base_func_proto(func_id); 7375 } 7376 } 7377 7378 static const struct bpf_func_proto * 7379 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7380 { 7381 switch (func_id) { 7382 case BPF_FUNC_perf_event_output: 7383 return &bpf_xdp_event_output_proto; 7384 case BPF_FUNC_get_smp_processor_id: 7385 return &bpf_get_smp_processor_id_proto; 7386 case BPF_FUNC_csum_diff: 7387 return &bpf_csum_diff_proto; 7388 case BPF_FUNC_xdp_adjust_head: 7389 return &bpf_xdp_adjust_head_proto; 7390 case BPF_FUNC_xdp_adjust_meta: 7391 return &bpf_xdp_adjust_meta_proto; 7392 case BPF_FUNC_redirect: 7393 return &bpf_xdp_redirect_proto; 7394 case BPF_FUNC_redirect_map: 7395 return &bpf_xdp_redirect_map_proto; 7396 case BPF_FUNC_xdp_adjust_tail: 7397 return &bpf_xdp_adjust_tail_proto; 7398 case BPF_FUNC_fib_lookup: 7399 return &bpf_xdp_fib_lookup_proto; 7400 case BPF_FUNC_check_mtu: 7401 return &bpf_xdp_check_mtu_proto; 7402 #ifdef CONFIG_INET 7403 case BPF_FUNC_sk_lookup_udp: 7404 return &bpf_xdp_sk_lookup_udp_proto; 7405 case BPF_FUNC_sk_lookup_tcp: 7406 return &bpf_xdp_sk_lookup_tcp_proto; 7407 case BPF_FUNC_sk_release: 7408 return &bpf_sk_release_proto; 7409 case BPF_FUNC_skc_lookup_tcp: 7410 return &bpf_xdp_skc_lookup_tcp_proto; 7411 case BPF_FUNC_tcp_check_syncookie: 7412 return &bpf_tcp_check_syncookie_proto; 7413 case BPF_FUNC_tcp_gen_syncookie: 7414 return &bpf_tcp_gen_syncookie_proto; 7415 #endif 7416 default: 7417 return bpf_sk_base_func_proto(func_id); 7418 } 7419 } 7420 7421 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 7422 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 7423 7424 static const struct bpf_func_proto * 7425 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7426 { 7427 switch (func_id) { 7428 case BPF_FUNC_setsockopt: 7429 return &bpf_sock_ops_setsockopt_proto; 7430 case BPF_FUNC_getsockopt: 7431 return &bpf_sock_ops_getsockopt_proto; 7432 case BPF_FUNC_sock_ops_cb_flags_set: 7433 return &bpf_sock_ops_cb_flags_set_proto; 7434 case BPF_FUNC_sock_map_update: 7435 return &bpf_sock_map_update_proto; 7436 case BPF_FUNC_sock_hash_update: 7437 return &bpf_sock_hash_update_proto; 7438 case BPF_FUNC_get_socket_cookie: 7439 return &bpf_get_socket_cookie_sock_ops_proto; 7440 case BPF_FUNC_get_local_storage: 7441 return &bpf_get_local_storage_proto; 7442 case BPF_FUNC_perf_event_output: 7443 return &bpf_event_output_data_proto; 7444 case BPF_FUNC_sk_storage_get: 7445 return &bpf_sk_storage_get_proto; 7446 case BPF_FUNC_sk_storage_delete: 7447 return &bpf_sk_storage_delete_proto; 7448 #ifdef CONFIG_INET 7449 case BPF_FUNC_load_hdr_opt: 7450 return &bpf_sock_ops_load_hdr_opt_proto; 7451 case BPF_FUNC_store_hdr_opt: 7452 return &bpf_sock_ops_store_hdr_opt_proto; 7453 case BPF_FUNC_reserve_hdr_opt: 7454 return &bpf_sock_ops_reserve_hdr_opt_proto; 7455 case BPF_FUNC_tcp_sock: 7456 return &bpf_tcp_sock_proto; 7457 #endif /* CONFIG_INET */ 7458 default: 7459 return bpf_sk_base_func_proto(func_id); 7460 } 7461 } 7462 7463 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 7464 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 7465 7466 static const struct bpf_func_proto * 7467 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7468 { 7469 switch (func_id) { 7470 case BPF_FUNC_msg_redirect_map: 7471 return &bpf_msg_redirect_map_proto; 7472 case BPF_FUNC_msg_redirect_hash: 7473 return &bpf_msg_redirect_hash_proto; 7474 case BPF_FUNC_msg_apply_bytes: 7475 return &bpf_msg_apply_bytes_proto; 7476 case BPF_FUNC_msg_cork_bytes: 7477 return &bpf_msg_cork_bytes_proto; 7478 case BPF_FUNC_msg_pull_data: 7479 return &bpf_msg_pull_data_proto; 7480 case BPF_FUNC_msg_push_data: 7481 return &bpf_msg_push_data_proto; 7482 case BPF_FUNC_msg_pop_data: 7483 return &bpf_msg_pop_data_proto; 7484 case BPF_FUNC_perf_event_output: 7485 return &bpf_event_output_data_proto; 7486 case BPF_FUNC_get_current_uid_gid: 7487 return &bpf_get_current_uid_gid_proto; 7488 case BPF_FUNC_get_current_pid_tgid: 7489 return &bpf_get_current_pid_tgid_proto; 7490 case BPF_FUNC_sk_storage_get: 7491 return &bpf_sk_storage_get_proto; 7492 case BPF_FUNC_sk_storage_delete: 7493 return &bpf_sk_storage_delete_proto; 7494 #ifdef CONFIG_CGROUPS 7495 case BPF_FUNC_get_current_cgroup_id: 7496 return &bpf_get_current_cgroup_id_proto; 7497 case BPF_FUNC_get_current_ancestor_cgroup_id: 7498 return &bpf_get_current_ancestor_cgroup_id_proto; 7499 #endif 7500 #ifdef CONFIG_CGROUP_NET_CLASSID 7501 case BPF_FUNC_get_cgroup_classid: 7502 return &bpf_get_cgroup_classid_curr_proto; 7503 #endif 7504 default: 7505 return bpf_sk_base_func_proto(func_id); 7506 } 7507 } 7508 7509 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 7510 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 7511 7512 static const struct bpf_func_proto * 7513 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7514 { 7515 switch (func_id) { 7516 case BPF_FUNC_skb_store_bytes: 7517 return &bpf_skb_store_bytes_proto; 7518 case BPF_FUNC_skb_load_bytes: 7519 return &bpf_skb_load_bytes_proto; 7520 case BPF_FUNC_skb_pull_data: 7521 return &sk_skb_pull_data_proto; 7522 case BPF_FUNC_skb_change_tail: 7523 return &sk_skb_change_tail_proto; 7524 case BPF_FUNC_skb_change_head: 7525 return &sk_skb_change_head_proto; 7526 case BPF_FUNC_skb_adjust_room: 7527 return &sk_skb_adjust_room_proto; 7528 case BPF_FUNC_get_socket_cookie: 7529 return &bpf_get_socket_cookie_proto; 7530 case BPF_FUNC_get_socket_uid: 7531 return &bpf_get_socket_uid_proto; 7532 case BPF_FUNC_sk_redirect_map: 7533 return &bpf_sk_redirect_map_proto; 7534 case BPF_FUNC_sk_redirect_hash: 7535 return &bpf_sk_redirect_hash_proto; 7536 case BPF_FUNC_perf_event_output: 7537 return &bpf_skb_event_output_proto; 7538 #ifdef CONFIG_INET 7539 case BPF_FUNC_sk_lookup_tcp: 7540 return &bpf_sk_lookup_tcp_proto; 7541 case BPF_FUNC_sk_lookup_udp: 7542 return &bpf_sk_lookup_udp_proto; 7543 case BPF_FUNC_sk_release: 7544 return &bpf_sk_release_proto; 7545 case BPF_FUNC_skc_lookup_tcp: 7546 return &bpf_skc_lookup_tcp_proto; 7547 #endif 7548 default: 7549 return bpf_sk_base_func_proto(func_id); 7550 } 7551 } 7552 7553 static const struct bpf_func_proto * 7554 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7555 { 7556 switch (func_id) { 7557 case BPF_FUNC_skb_load_bytes: 7558 return &bpf_flow_dissector_load_bytes_proto; 7559 default: 7560 return bpf_sk_base_func_proto(func_id); 7561 } 7562 } 7563 7564 static const struct bpf_func_proto * 7565 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7566 { 7567 switch (func_id) { 7568 case BPF_FUNC_skb_load_bytes: 7569 return &bpf_skb_load_bytes_proto; 7570 case BPF_FUNC_skb_pull_data: 7571 return &bpf_skb_pull_data_proto; 7572 case BPF_FUNC_csum_diff: 7573 return &bpf_csum_diff_proto; 7574 case BPF_FUNC_get_cgroup_classid: 7575 return &bpf_get_cgroup_classid_proto; 7576 case BPF_FUNC_get_route_realm: 7577 return &bpf_get_route_realm_proto; 7578 case BPF_FUNC_get_hash_recalc: 7579 return &bpf_get_hash_recalc_proto; 7580 case BPF_FUNC_perf_event_output: 7581 return &bpf_skb_event_output_proto; 7582 case BPF_FUNC_get_smp_processor_id: 7583 return &bpf_get_smp_processor_id_proto; 7584 case BPF_FUNC_skb_under_cgroup: 7585 return &bpf_skb_under_cgroup_proto; 7586 default: 7587 return bpf_sk_base_func_proto(func_id); 7588 } 7589 } 7590 7591 static const struct bpf_func_proto * 7592 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7593 { 7594 switch (func_id) { 7595 case BPF_FUNC_lwt_push_encap: 7596 return &bpf_lwt_in_push_encap_proto; 7597 default: 7598 return lwt_out_func_proto(func_id, prog); 7599 } 7600 } 7601 7602 static const struct bpf_func_proto * 7603 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7604 { 7605 switch (func_id) { 7606 case BPF_FUNC_skb_get_tunnel_key: 7607 return &bpf_skb_get_tunnel_key_proto; 7608 case BPF_FUNC_skb_set_tunnel_key: 7609 return bpf_get_skb_set_tunnel_proto(func_id); 7610 case BPF_FUNC_skb_get_tunnel_opt: 7611 return &bpf_skb_get_tunnel_opt_proto; 7612 case BPF_FUNC_skb_set_tunnel_opt: 7613 return bpf_get_skb_set_tunnel_proto(func_id); 7614 case BPF_FUNC_redirect: 7615 return &bpf_redirect_proto; 7616 case BPF_FUNC_clone_redirect: 7617 return &bpf_clone_redirect_proto; 7618 case BPF_FUNC_skb_change_tail: 7619 return &bpf_skb_change_tail_proto; 7620 case BPF_FUNC_skb_change_head: 7621 return &bpf_skb_change_head_proto; 7622 case BPF_FUNC_skb_store_bytes: 7623 return &bpf_skb_store_bytes_proto; 7624 case BPF_FUNC_csum_update: 7625 return &bpf_csum_update_proto; 7626 case BPF_FUNC_csum_level: 7627 return &bpf_csum_level_proto; 7628 case BPF_FUNC_l3_csum_replace: 7629 return &bpf_l3_csum_replace_proto; 7630 case BPF_FUNC_l4_csum_replace: 7631 return &bpf_l4_csum_replace_proto; 7632 case BPF_FUNC_set_hash_invalid: 7633 return &bpf_set_hash_invalid_proto; 7634 case BPF_FUNC_lwt_push_encap: 7635 return &bpf_lwt_xmit_push_encap_proto; 7636 default: 7637 return lwt_out_func_proto(func_id, prog); 7638 } 7639 } 7640 7641 static const struct bpf_func_proto * 7642 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7643 { 7644 switch (func_id) { 7645 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7646 case BPF_FUNC_lwt_seg6_store_bytes: 7647 return &bpf_lwt_seg6_store_bytes_proto; 7648 case BPF_FUNC_lwt_seg6_action: 7649 return &bpf_lwt_seg6_action_proto; 7650 case BPF_FUNC_lwt_seg6_adjust_srh: 7651 return &bpf_lwt_seg6_adjust_srh_proto; 7652 #endif 7653 default: 7654 return lwt_out_func_proto(func_id, prog); 7655 } 7656 } 7657 7658 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 7659 const struct bpf_prog *prog, 7660 struct bpf_insn_access_aux *info) 7661 { 7662 const int size_default = sizeof(__u32); 7663 7664 if (off < 0 || off >= sizeof(struct __sk_buff)) 7665 return false; 7666 7667 /* The verifier guarantees that size > 0. */ 7668 if (off % size != 0) 7669 return false; 7670 7671 switch (off) { 7672 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 7673 if (off + size > offsetofend(struct __sk_buff, cb[4])) 7674 return false; 7675 break; 7676 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 7677 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 7678 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 7679 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 7680 case bpf_ctx_range(struct __sk_buff, data): 7681 case bpf_ctx_range(struct __sk_buff, data_meta): 7682 case bpf_ctx_range(struct __sk_buff, data_end): 7683 if (size != size_default) 7684 return false; 7685 break; 7686 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 7687 return false; 7688 case bpf_ctx_range(struct __sk_buff, tstamp): 7689 if (size != sizeof(__u64)) 7690 return false; 7691 break; 7692 case offsetof(struct __sk_buff, sk): 7693 if (type == BPF_WRITE || size != sizeof(__u64)) 7694 return false; 7695 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 7696 break; 7697 default: 7698 /* Only narrow read access allowed for now. */ 7699 if (type == BPF_WRITE) { 7700 if (size != size_default) 7701 return false; 7702 } else { 7703 bpf_ctx_record_field_size(info, size_default); 7704 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 7705 return false; 7706 } 7707 } 7708 7709 return true; 7710 } 7711 7712 static bool sk_filter_is_valid_access(int off, int size, 7713 enum bpf_access_type type, 7714 const struct bpf_prog *prog, 7715 struct bpf_insn_access_aux *info) 7716 { 7717 switch (off) { 7718 case bpf_ctx_range(struct __sk_buff, tc_classid): 7719 case bpf_ctx_range(struct __sk_buff, data): 7720 case bpf_ctx_range(struct __sk_buff, data_meta): 7721 case bpf_ctx_range(struct __sk_buff, data_end): 7722 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 7723 case bpf_ctx_range(struct __sk_buff, tstamp): 7724 case bpf_ctx_range(struct __sk_buff, wire_len): 7725 return false; 7726 } 7727 7728 if (type == BPF_WRITE) { 7729 switch (off) { 7730 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 7731 break; 7732 default: 7733 return false; 7734 } 7735 } 7736 7737 return bpf_skb_is_valid_access(off, size, type, prog, info); 7738 } 7739 7740 static bool cg_skb_is_valid_access(int off, int size, 7741 enum bpf_access_type type, 7742 const struct bpf_prog *prog, 7743 struct bpf_insn_access_aux *info) 7744 { 7745 switch (off) { 7746 case bpf_ctx_range(struct __sk_buff, tc_classid): 7747 case bpf_ctx_range(struct __sk_buff, data_meta): 7748 case bpf_ctx_range(struct __sk_buff, wire_len): 7749 return false; 7750 case bpf_ctx_range(struct __sk_buff, data): 7751 case bpf_ctx_range(struct __sk_buff, data_end): 7752 if (!bpf_capable()) 7753 return false; 7754 break; 7755 } 7756 7757 if (type == BPF_WRITE) { 7758 switch (off) { 7759 case bpf_ctx_range(struct __sk_buff, mark): 7760 case bpf_ctx_range(struct __sk_buff, priority): 7761 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 7762 break; 7763 case bpf_ctx_range(struct __sk_buff, tstamp): 7764 if (!bpf_capable()) 7765 return false; 7766 break; 7767 default: 7768 return false; 7769 } 7770 } 7771 7772 switch (off) { 7773 case bpf_ctx_range(struct __sk_buff, data): 7774 info->reg_type = PTR_TO_PACKET; 7775 break; 7776 case bpf_ctx_range(struct __sk_buff, data_end): 7777 info->reg_type = PTR_TO_PACKET_END; 7778 break; 7779 } 7780 7781 return bpf_skb_is_valid_access(off, size, type, prog, info); 7782 } 7783 7784 static bool lwt_is_valid_access(int off, int size, 7785 enum bpf_access_type type, 7786 const struct bpf_prog *prog, 7787 struct bpf_insn_access_aux *info) 7788 { 7789 switch (off) { 7790 case bpf_ctx_range(struct __sk_buff, tc_classid): 7791 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 7792 case bpf_ctx_range(struct __sk_buff, data_meta): 7793 case bpf_ctx_range(struct __sk_buff, tstamp): 7794 case bpf_ctx_range(struct __sk_buff, wire_len): 7795 return false; 7796 } 7797 7798 if (type == BPF_WRITE) { 7799 switch (off) { 7800 case bpf_ctx_range(struct __sk_buff, mark): 7801 case bpf_ctx_range(struct __sk_buff, priority): 7802 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 7803 break; 7804 default: 7805 return false; 7806 } 7807 } 7808 7809 switch (off) { 7810 case bpf_ctx_range(struct __sk_buff, data): 7811 info->reg_type = PTR_TO_PACKET; 7812 break; 7813 case bpf_ctx_range(struct __sk_buff, data_end): 7814 info->reg_type = PTR_TO_PACKET_END; 7815 break; 7816 } 7817 7818 return bpf_skb_is_valid_access(off, size, type, prog, info); 7819 } 7820 7821 /* Attach type specific accesses */ 7822 static bool __sock_filter_check_attach_type(int off, 7823 enum bpf_access_type access_type, 7824 enum bpf_attach_type attach_type) 7825 { 7826 switch (off) { 7827 case offsetof(struct bpf_sock, bound_dev_if): 7828 case offsetof(struct bpf_sock, mark): 7829 case offsetof(struct bpf_sock, priority): 7830 switch (attach_type) { 7831 case BPF_CGROUP_INET_SOCK_CREATE: 7832 case BPF_CGROUP_INET_SOCK_RELEASE: 7833 goto full_access; 7834 default: 7835 return false; 7836 } 7837 case bpf_ctx_range(struct bpf_sock, src_ip4): 7838 switch (attach_type) { 7839 case BPF_CGROUP_INET4_POST_BIND: 7840 goto read_only; 7841 default: 7842 return false; 7843 } 7844 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 7845 switch (attach_type) { 7846 case BPF_CGROUP_INET6_POST_BIND: 7847 goto read_only; 7848 default: 7849 return false; 7850 } 7851 case bpf_ctx_range(struct bpf_sock, src_port): 7852 switch (attach_type) { 7853 case BPF_CGROUP_INET4_POST_BIND: 7854 case BPF_CGROUP_INET6_POST_BIND: 7855 goto read_only; 7856 default: 7857 return false; 7858 } 7859 } 7860 read_only: 7861 return access_type == BPF_READ; 7862 full_access: 7863 return true; 7864 } 7865 7866 bool bpf_sock_common_is_valid_access(int off, int size, 7867 enum bpf_access_type type, 7868 struct bpf_insn_access_aux *info) 7869 { 7870 switch (off) { 7871 case bpf_ctx_range_till(struct bpf_sock, type, priority): 7872 return false; 7873 default: 7874 return bpf_sock_is_valid_access(off, size, type, info); 7875 } 7876 } 7877 7878 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7879 struct bpf_insn_access_aux *info) 7880 { 7881 const int size_default = sizeof(__u32); 7882 7883 if (off < 0 || off >= sizeof(struct bpf_sock)) 7884 return false; 7885 if (off % size != 0) 7886 return false; 7887 7888 switch (off) { 7889 case offsetof(struct bpf_sock, state): 7890 case offsetof(struct bpf_sock, family): 7891 case offsetof(struct bpf_sock, type): 7892 case offsetof(struct bpf_sock, protocol): 7893 case offsetof(struct bpf_sock, dst_port): 7894 case offsetof(struct bpf_sock, src_port): 7895 case offsetof(struct bpf_sock, rx_queue_mapping): 7896 case bpf_ctx_range(struct bpf_sock, src_ip4): 7897 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 7898 case bpf_ctx_range(struct bpf_sock, dst_ip4): 7899 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 7900 bpf_ctx_record_field_size(info, size_default); 7901 return bpf_ctx_narrow_access_ok(off, size, size_default); 7902 } 7903 7904 return size == size_default; 7905 } 7906 7907 static bool sock_filter_is_valid_access(int off, int size, 7908 enum bpf_access_type type, 7909 const struct bpf_prog *prog, 7910 struct bpf_insn_access_aux *info) 7911 { 7912 if (!bpf_sock_is_valid_access(off, size, type, info)) 7913 return false; 7914 return __sock_filter_check_attach_type(off, type, 7915 prog->expected_attach_type); 7916 } 7917 7918 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 7919 const struct bpf_prog *prog) 7920 { 7921 /* Neither direct read nor direct write requires any preliminary 7922 * action. 7923 */ 7924 return 0; 7925 } 7926 7927 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 7928 const struct bpf_prog *prog, int drop_verdict) 7929 { 7930 struct bpf_insn *insn = insn_buf; 7931 7932 if (!direct_write) 7933 return 0; 7934 7935 /* if (!skb->cloned) 7936 * goto start; 7937 * 7938 * (Fast-path, otherwise approximation that we might be 7939 * a clone, do the rest in helper.) 7940 */ 7941 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); 7942 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 7943 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 7944 7945 /* ret = bpf_skb_pull_data(skb, 0); */ 7946 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 7947 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 7948 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 7949 BPF_FUNC_skb_pull_data); 7950 /* if (!ret) 7951 * goto restore; 7952 * return TC_ACT_SHOT; 7953 */ 7954 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 7955 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 7956 *insn++ = BPF_EXIT_INSN(); 7957 7958 /* restore: */ 7959 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 7960 /* start: */ 7961 *insn++ = prog->insnsi[0]; 7962 7963 return insn - insn_buf; 7964 } 7965 7966 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 7967 struct bpf_insn *insn_buf) 7968 { 7969 bool indirect = BPF_MODE(orig->code) == BPF_IND; 7970 struct bpf_insn *insn = insn_buf; 7971 7972 if (!indirect) { 7973 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 7974 } else { 7975 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 7976 if (orig->imm) 7977 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 7978 } 7979 /* We're guaranteed here that CTX is in R6. */ 7980 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 7981 7982 switch (BPF_SIZE(orig->code)) { 7983 case BPF_B: 7984 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 7985 break; 7986 case BPF_H: 7987 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 7988 break; 7989 case BPF_W: 7990 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 7991 break; 7992 } 7993 7994 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 7995 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 7996 *insn++ = BPF_EXIT_INSN(); 7997 7998 return insn - insn_buf; 7999 } 8000 8001 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 8002 const struct bpf_prog *prog) 8003 { 8004 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 8005 } 8006 8007 static bool tc_cls_act_is_valid_access(int off, int size, 8008 enum bpf_access_type type, 8009 const struct bpf_prog *prog, 8010 struct bpf_insn_access_aux *info) 8011 { 8012 if (type == BPF_WRITE) { 8013 switch (off) { 8014 case bpf_ctx_range(struct __sk_buff, mark): 8015 case bpf_ctx_range(struct __sk_buff, tc_index): 8016 case bpf_ctx_range(struct __sk_buff, priority): 8017 case bpf_ctx_range(struct __sk_buff, tc_classid): 8018 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8019 case bpf_ctx_range(struct __sk_buff, tstamp): 8020 case bpf_ctx_range(struct __sk_buff, queue_mapping): 8021 break; 8022 default: 8023 return false; 8024 } 8025 } 8026 8027 switch (off) { 8028 case bpf_ctx_range(struct __sk_buff, data): 8029 info->reg_type = PTR_TO_PACKET; 8030 break; 8031 case bpf_ctx_range(struct __sk_buff, data_meta): 8032 info->reg_type = PTR_TO_PACKET_META; 8033 break; 8034 case bpf_ctx_range(struct __sk_buff, data_end): 8035 info->reg_type = PTR_TO_PACKET_END; 8036 break; 8037 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8038 return false; 8039 } 8040 8041 return bpf_skb_is_valid_access(off, size, type, prog, info); 8042 } 8043 8044 static bool __is_valid_xdp_access(int off, int size) 8045 { 8046 if (off < 0 || off >= sizeof(struct xdp_md)) 8047 return false; 8048 if (off % size != 0) 8049 return false; 8050 if (size != sizeof(__u32)) 8051 return false; 8052 8053 return true; 8054 } 8055 8056 static bool xdp_is_valid_access(int off, int size, 8057 enum bpf_access_type type, 8058 const struct bpf_prog *prog, 8059 struct bpf_insn_access_aux *info) 8060 { 8061 if (prog->expected_attach_type != BPF_XDP_DEVMAP) { 8062 switch (off) { 8063 case offsetof(struct xdp_md, egress_ifindex): 8064 return false; 8065 } 8066 } 8067 8068 if (type == BPF_WRITE) { 8069 if (bpf_prog_is_dev_bound(prog->aux)) { 8070 switch (off) { 8071 case offsetof(struct xdp_md, rx_queue_index): 8072 return __is_valid_xdp_access(off, size); 8073 } 8074 } 8075 return false; 8076 } 8077 8078 switch (off) { 8079 case offsetof(struct xdp_md, data): 8080 info->reg_type = PTR_TO_PACKET; 8081 break; 8082 case offsetof(struct xdp_md, data_meta): 8083 info->reg_type = PTR_TO_PACKET_META; 8084 break; 8085 case offsetof(struct xdp_md, data_end): 8086 info->reg_type = PTR_TO_PACKET_END; 8087 break; 8088 } 8089 8090 return __is_valid_xdp_access(off, size); 8091 } 8092 8093 void bpf_warn_invalid_xdp_action(u32 act) 8094 { 8095 const u32 act_max = XDP_REDIRECT; 8096 8097 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", 8098 act > act_max ? "Illegal" : "Driver unsupported", 8099 act); 8100 } 8101 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 8102 8103 static bool sock_addr_is_valid_access(int off, int size, 8104 enum bpf_access_type type, 8105 const struct bpf_prog *prog, 8106 struct bpf_insn_access_aux *info) 8107 { 8108 const int size_default = sizeof(__u32); 8109 8110 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 8111 return false; 8112 if (off % size != 0) 8113 return false; 8114 8115 /* Disallow access to IPv6 fields from IPv4 contex and vise 8116 * versa. 8117 */ 8118 switch (off) { 8119 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8120 switch (prog->expected_attach_type) { 8121 case BPF_CGROUP_INET4_BIND: 8122 case BPF_CGROUP_INET4_CONNECT: 8123 case BPF_CGROUP_INET4_GETPEERNAME: 8124 case BPF_CGROUP_INET4_GETSOCKNAME: 8125 case BPF_CGROUP_UDP4_SENDMSG: 8126 case BPF_CGROUP_UDP4_RECVMSG: 8127 break; 8128 default: 8129 return false; 8130 } 8131 break; 8132 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8133 switch (prog->expected_attach_type) { 8134 case BPF_CGROUP_INET6_BIND: 8135 case BPF_CGROUP_INET6_CONNECT: 8136 case BPF_CGROUP_INET6_GETPEERNAME: 8137 case BPF_CGROUP_INET6_GETSOCKNAME: 8138 case BPF_CGROUP_UDP6_SENDMSG: 8139 case BPF_CGROUP_UDP6_RECVMSG: 8140 break; 8141 default: 8142 return false; 8143 } 8144 break; 8145 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8146 switch (prog->expected_attach_type) { 8147 case BPF_CGROUP_UDP4_SENDMSG: 8148 break; 8149 default: 8150 return false; 8151 } 8152 break; 8153 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8154 msg_src_ip6[3]): 8155 switch (prog->expected_attach_type) { 8156 case BPF_CGROUP_UDP6_SENDMSG: 8157 break; 8158 default: 8159 return false; 8160 } 8161 break; 8162 } 8163 8164 switch (off) { 8165 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8166 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8167 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8168 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8169 msg_src_ip6[3]): 8170 case bpf_ctx_range(struct bpf_sock_addr, user_port): 8171 if (type == BPF_READ) { 8172 bpf_ctx_record_field_size(info, size_default); 8173 8174 if (bpf_ctx_wide_access_ok(off, size, 8175 struct bpf_sock_addr, 8176 user_ip6)) 8177 return true; 8178 8179 if (bpf_ctx_wide_access_ok(off, size, 8180 struct bpf_sock_addr, 8181 msg_src_ip6)) 8182 return true; 8183 8184 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 8185 return false; 8186 } else { 8187 if (bpf_ctx_wide_access_ok(off, size, 8188 struct bpf_sock_addr, 8189 user_ip6)) 8190 return true; 8191 8192 if (bpf_ctx_wide_access_ok(off, size, 8193 struct bpf_sock_addr, 8194 msg_src_ip6)) 8195 return true; 8196 8197 if (size != size_default) 8198 return false; 8199 } 8200 break; 8201 case offsetof(struct bpf_sock_addr, sk): 8202 if (type != BPF_READ) 8203 return false; 8204 if (size != sizeof(__u64)) 8205 return false; 8206 info->reg_type = PTR_TO_SOCKET; 8207 break; 8208 default: 8209 if (type == BPF_READ) { 8210 if (size != size_default) 8211 return false; 8212 } else { 8213 return false; 8214 } 8215 } 8216 8217 return true; 8218 } 8219 8220 static bool sock_ops_is_valid_access(int off, int size, 8221 enum bpf_access_type type, 8222 const struct bpf_prog *prog, 8223 struct bpf_insn_access_aux *info) 8224 { 8225 const int size_default = sizeof(__u32); 8226 8227 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 8228 return false; 8229 8230 /* The verifier guarantees that size > 0. */ 8231 if (off % size != 0) 8232 return false; 8233 8234 if (type == BPF_WRITE) { 8235 switch (off) { 8236 case offsetof(struct bpf_sock_ops, reply): 8237 case offsetof(struct bpf_sock_ops, sk_txhash): 8238 if (size != size_default) 8239 return false; 8240 break; 8241 default: 8242 return false; 8243 } 8244 } else { 8245 switch (off) { 8246 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 8247 bytes_acked): 8248 if (size != sizeof(__u64)) 8249 return false; 8250 break; 8251 case offsetof(struct bpf_sock_ops, sk): 8252 if (size != sizeof(__u64)) 8253 return false; 8254 info->reg_type = PTR_TO_SOCKET_OR_NULL; 8255 break; 8256 case offsetof(struct bpf_sock_ops, skb_data): 8257 if (size != sizeof(__u64)) 8258 return false; 8259 info->reg_type = PTR_TO_PACKET; 8260 break; 8261 case offsetof(struct bpf_sock_ops, skb_data_end): 8262 if (size != sizeof(__u64)) 8263 return false; 8264 info->reg_type = PTR_TO_PACKET_END; 8265 break; 8266 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 8267 bpf_ctx_record_field_size(info, size_default); 8268 return bpf_ctx_narrow_access_ok(off, size, 8269 size_default); 8270 default: 8271 if (size != size_default) 8272 return false; 8273 break; 8274 } 8275 } 8276 8277 return true; 8278 } 8279 8280 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 8281 const struct bpf_prog *prog) 8282 { 8283 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 8284 } 8285 8286 static bool sk_skb_is_valid_access(int off, int size, 8287 enum bpf_access_type type, 8288 const struct bpf_prog *prog, 8289 struct bpf_insn_access_aux *info) 8290 { 8291 switch (off) { 8292 case bpf_ctx_range(struct __sk_buff, tc_classid): 8293 case bpf_ctx_range(struct __sk_buff, data_meta): 8294 case bpf_ctx_range(struct __sk_buff, tstamp): 8295 case bpf_ctx_range(struct __sk_buff, wire_len): 8296 return false; 8297 } 8298 8299 if (type == BPF_WRITE) { 8300 switch (off) { 8301 case bpf_ctx_range(struct __sk_buff, tc_index): 8302 case bpf_ctx_range(struct __sk_buff, priority): 8303 break; 8304 default: 8305 return false; 8306 } 8307 } 8308 8309 switch (off) { 8310 case bpf_ctx_range(struct __sk_buff, mark): 8311 return false; 8312 case bpf_ctx_range(struct __sk_buff, data): 8313 info->reg_type = PTR_TO_PACKET; 8314 break; 8315 case bpf_ctx_range(struct __sk_buff, data_end): 8316 info->reg_type = PTR_TO_PACKET_END; 8317 break; 8318 } 8319 8320 return bpf_skb_is_valid_access(off, size, type, prog, info); 8321 } 8322 8323 static bool sk_msg_is_valid_access(int off, int size, 8324 enum bpf_access_type type, 8325 const struct bpf_prog *prog, 8326 struct bpf_insn_access_aux *info) 8327 { 8328 if (type == BPF_WRITE) 8329 return false; 8330 8331 if (off % size != 0) 8332 return false; 8333 8334 switch (off) { 8335 case offsetof(struct sk_msg_md, data): 8336 info->reg_type = PTR_TO_PACKET; 8337 if (size != sizeof(__u64)) 8338 return false; 8339 break; 8340 case offsetof(struct sk_msg_md, data_end): 8341 info->reg_type = PTR_TO_PACKET_END; 8342 if (size != sizeof(__u64)) 8343 return false; 8344 break; 8345 case offsetof(struct sk_msg_md, sk): 8346 if (size != sizeof(__u64)) 8347 return false; 8348 info->reg_type = PTR_TO_SOCKET; 8349 break; 8350 case bpf_ctx_range(struct sk_msg_md, family): 8351 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 8352 case bpf_ctx_range(struct sk_msg_md, local_ip4): 8353 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 8354 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 8355 case bpf_ctx_range(struct sk_msg_md, remote_port): 8356 case bpf_ctx_range(struct sk_msg_md, local_port): 8357 case bpf_ctx_range(struct sk_msg_md, size): 8358 if (size != sizeof(__u32)) 8359 return false; 8360 break; 8361 default: 8362 return false; 8363 } 8364 return true; 8365 } 8366 8367 static bool flow_dissector_is_valid_access(int off, int size, 8368 enum bpf_access_type type, 8369 const struct bpf_prog *prog, 8370 struct bpf_insn_access_aux *info) 8371 { 8372 const int size_default = sizeof(__u32); 8373 8374 if (off < 0 || off >= sizeof(struct __sk_buff)) 8375 return false; 8376 8377 if (type == BPF_WRITE) 8378 return false; 8379 8380 switch (off) { 8381 case bpf_ctx_range(struct __sk_buff, data): 8382 if (size != size_default) 8383 return false; 8384 info->reg_type = PTR_TO_PACKET; 8385 return true; 8386 case bpf_ctx_range(struct __sk_buff, data_end): 8387 if (size != size_default) 8388 return false; 8389 info->reg_type = PTR_TO_PACKET_END; 8390 return true; 8391 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 8392 if (size != sizeof(__u64)) 8393 return false; 8394 info->reg_type = PTR_TO_FLOW_KEYS; 8395 return true; 8396 default: 8397 return false; 8398 } 8399 } 8400 8401 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 8402 const struct bpf_insn *si, 8403 struct bpf_insn *insn_buf, 8404 struct bpf_prog *prog, 8405 u32 *target_size) 8406 8407 { 8408 struct bpf_insn *insn = insn_buf; 8409 8410 switch (si->off) { 8411 case offsetof(struct __sk_buff, data): 8412 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 8413 si->dst_reg, si->src_reg, 8414 offsetof(struct bpf_flow_dissector, data)); 8415 break; 8416 8417 case offsetof(struct __sk_buff, data_end): 8418 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 8419 si->dst_reg, si->src_reg, 8420 offsetof(struct bpf_flow_dissector, data_end)); 8421 break; 8422 8423 case offsetof(struct __sk_buff, flow_keys): 8424 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 8425 si->dst_reg, si->src_reg, 8426 offsetof(struct bpf_flow_dissector, flow_keys)); 8427 break; 8428 } 8429 8430 return insn - insn_buf; 8431 } 8432 8433 static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si, 8434 struct bpf_insn *insn) 8435 { 8436 /* si->dst_reg = skb_shinfo(SKB); */ 8437 #ifdef NET_SKBUFF_DATA_USES_OFFSET 8438 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 8439 BPF_REG_AX, si->src_reg, 8440 offsetof(struct sk_buff, end)); 8441 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 8442 si->dst_reg, si->src_reg, 8443 offsetof(struct sk_buff, head)); 8444 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); 8445 #else 8446 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 8447 si->dst_reg, si->src_reg, 8448 offsetof(struct sk_buff, end)); 8449 #endif 8450 8451 return insn; 8452 } 8453 8454 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 8455 const struct bpf_insn *si, 8456 struct bpf_insn *insn_buf, 8457 struct bpf_prog *prog, u32 *target_size) 8458 { 8459 struct bpf_insn *insn = insn_buf; 8460 int off; 8461 8462 switch (si->off) { 8463 case offsetof(struct __sk_buff, len): 8464 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8465 bpf_target_off(struct sk_buff, len, 4, 8466 target_size)); 8467 break; 8468 8469 case offsetof(struct __sk_buff, protocol): 8470 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 8471 bpf_target_off(struct sk_buff, protocol, 2, 8472 target_size)); 8473 break; 8474 8475 case offsetof(struct __sk_buff, vlan_proto): 8476 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 8477 bpf_target_off(struct sk_buff, vlan_proto, 2, 8478 target_size)); 8479 break; 8480 8481 case offsetof(struct __sk_buff, priority): 8482 if (type == BPF_WRITE) 8483 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8484 bpf_target_off(struct sk_buff, priority, 4, 8485 target_size)); 8486 else 8487 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8488 bpf_target_off(struct sk_buff, priority, 4, 8489 target_size)); 8490 break; 8491 8492 case offsetof(struct __sk_buff, ingress_ifindex): 8493 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8494 bpf_target_off(struct sk_buff, skb_iif, 4, 8495 target_size)); 8496 break; 8497 8498 case offsetof(struct __sk_buff, ifindex): 8499 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 8500 si->dst_reg, si->src_reg, 8501 offsetof(struct sk_buff, dev)); 8502 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 8503 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8504 bpf_target_off(struct net_device, ifindex, 4, 8505 target_size)); 8506 break; 8507 8508 case offsetof(struct __sk_buff, hash): 8509 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8510 bpf_target_off(struct sk_buff, hash, 4, 8511 target_size)); 8512 break; 8513 8514 case offsetof(struct __sk_buff, mark): 8515 if (type == BPF_WRITE) 8516 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8517 bpf_target_off(struct sk_buff, mark, 4, 8518 target_size)); 8519 else 8520 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8521 bpf_target_off(struct sk_buff, mark, 4, 8522 target_size)); 8523 break; 8524 8525 case offsetof(struct __sk_buff, pkt_type): 8526 *target_size = 1; 8527 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 8528 PKT_TYPE_OFFSET()); 8529 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 8530 #ifdef __BIG_ENDIAN_BITFIELD 8531 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 8532 #endif 8533 break; 8534 8535 case offsetof(struct __sk_buff, queue_mapping): 8536 if (type == BPF_WRITE) { 8537 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 8538 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 8539 bpf_target_off(struct sk_buff, 8540 queue_mapping, 8541 2, target_size)); 8542 } else { 8543 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 8544 bpf_target_off(struct sk_buff, 8545 queue_mapping, 8546 2, target_size)); 8547 } 8548 break; 8549 8550 case offsetof(struct __sk_buff, vlan_present): 8551 *target_size = 1; 8552 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 8553 PKT_VLAN_PRESENT_OFFSET()); 8554 if (PKT_VLAN_PRESENT_BIT) 8555 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); 8556 if (PKT_VLAN_PRESENT_BIT < 7) 8557 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); 8558 break; 8559 8560 case offsetof(struct __sk_buff, vlan_tci): 8561 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 8562 bpf_target_off(struct sk_buff, vlan_tci, 2, 8563 target_size)); 8564 break; 8565 8566 case offsetof(struct __sk_buff, cb[0]) ... 8567 offsetofend(struct __sk_buff, cb[4]) - 1: 8568 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 8569 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 8570 offsetof(struct qdisc_skb_cb, data)) % 8571 sizeof(__u64)); 8572 8573 prog->cb_access = 1; 8574 off = si->off; 8575 off -= offsetof(struct __sk_buff, cb[0]); 8576 off += offsetof(struct sk_buff, cb); 8577 off += offsetof(struct qdisc_skb_cb, data); 8578 if (type == BPF_WRITE) 8579 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, 8580 si->src_reg, off); 8581 else 8582 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 8583 si->src_reg, off); 8584 break; 8585 8586 case offsetof(struct __sk_buff, tc_classid): 8587 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 8588 8589 off = si->off; 8590 off -= offsetof(struct __sk_buff, tc_classid); 8591 off += offsetof(struct sk_buff, cb); 8592 off += offsetof(struct qdisc_skb_cb, tc_classid); 8593 *target_size = 2; 8594 if (type == BPF_WRITE) 8595 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, 8596 si->src_reg, off); 8597 else 8598 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 8599 si->src_reg, off); 8600 break; 8601 8602 case offsetof(struct __sk_buff, data): 8603 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 8604 si->dst_reg, si->src_reg, 8605 offsetof(struct sk_buff, data)); 8606 break; 8607 8608 case offsetof(struct __sk_buff, data_meta): 8609 off = si->off; 8610 off -= offsetof(struct __sk_buff, data_meta); 8611 off += offsetof(struct sk_buff, cb); 8612 off += offsetof(struct bpf_skb_data_end, data_meta); 8613 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 8614 si->src_reg, off); 8615 break; 8616 8617 case offsetof(struct __sk_buff, data_end): 8618 off = si->off; 8619 off -= offsetof(struct __sk_buff, data_end); 8620 off += offsetof(struct sk_buff, cb); 8621 off += offsetof(struct bpf_skb_data_end, data_end); 8622 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 8623 si->src_reg, off); 8624 break; 8625 8626 case offsetof(struct __sk_buff, tc_index): 8627 #ifdef CONFIG_NET_SCHED 8628 if (type == BPF_WRITE) 8629 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 8630 bpf_target_off(struct sk_buff, tc_index, 2, 8631 target_size)); 8632 else 8633 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 8634 bpf_target_off(struct sk_buff, tc_index, 2, 8635 target_size)); 8636 #else 8637 *target_size = 2; 8638 if (type == BPF_WRITE) 8639 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 8640 else 8641 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 8642 #endif 8643 break; 8644 8645 case offsetof(struct __sk_buff, napi_id): 8646 #if defined(CONFIG_NET_RX_BUSY_POLL) 8647 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8648 bpf_target_off(struct sk_buff, napi_id, 4, 8649 target_size)); 8650 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 8651 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 8652 #else 8653 *target_size = 4; 8654 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 8655 #endif 8656 break; 8657 case offsetof(struct __sk_buff, family): 8658 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 8659 8660 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8661 si->dst_reg, si->src_reg, 8662 offsetof(struct sk_buff, sk)); 8663 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8664 bpf_target_off(struct sock_common, 8665 skc_family, 8666 2, target_size)); 8667 break; 8668 case offsetof(struct __sk_buff, remote_ip4): 8669 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 8670 8671 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8672 si->dst_reg, si->src_reg, 8673 offsetof(struct sk_buff, sk)); 8674 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8675 bpf_target_off(struct sock_common, 8676 skc_daddr, 8677 4, target_size)); 8678 break; 8679 case offsetof(struct __sk_buff, local_ip4): 8680 BUILD_BUG_ON(sizeof_field(struct sock_common, 8681 skc_rcv_saddr) != 4); 8682 8683 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8684 si->dst_reg, si->src_reg, 8685 offsetof(struct sk_buff, sk)); 8686 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8687 bpf_target_off(struct sock_common, 8688 skc_rcv_saddr, 8689 4, target_size)); 8690 break; 8691 case offsetof(struct __sk_buff, remote_ip6[0]) ... 8692 offsetof(struct __sk_buff, remote_ip6[3]): 8693 #if IS_ENABLED(CONFIG_IPV6) 8694 BUILD_BUG_ON(sizeof_field(struct sock_common, 8695 skc_v6_daddr.s6_addr32[0]) != 4); 8696 8697 off = si->off; 8698 off -= offsetof(struct __sk_buff, remote_ip6[0]); 8699 8700 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8701 si->dst_reg, si->src_reg, 8702 offsetof(struct sk_buff, sk)); 8703 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8704 offsetof(struct sock_common, 8705 skc_v6_daddr.s6_addr32[0]) + 8706 off); 8707 #else 8708 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8709 #endif 8710 break; 8711 case offsetof(struct __sk_buff, local_ip6[0]) ... 8712 offsetof(struct __sk_buff, local_ip6[3]): 8713 #if IS_ENABLED(CONFIG_IPV6) 8714 BUILD_BUG_ON(sizeof_field(struct sock_common, 8715 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8716 8717 off = si->off; 8718 off -= offsetof(struct __sk_buff, local_ip6[0]); 8719 8720 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8721 si->dst_reg, si->src_reg, 8722 offsetof(struct sk_buff, sk)); 8723 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8724 offsetof(struct sock_common, 8725 skc_v6_rcv_saddr.s6_addr32[0]) + 8726 off); 8727 #else 8728 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8729 #endif 8730 break; 8731 8732 case offsetof(struct __sk_buff, remote_port): 8733 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 8734 8735 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8736 si->dst_reg, si->src_reg, 8737 offsetof(struct sk_buff, sk)); 8738 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8739 bpf_target_off(struct sock_common, 8740 skc_dport, 8741 2, target_size)); 8742 #ifndef __BIG_ENDIAN_BITFIELD 8743 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8744 #endif 8745 break; 8746 8747 case offsetof(struct __sk_buff, local_port): 8748 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 8749 8750 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8751 si->dst_reg, si->src_reg, 8752 offsetof(struct sk_buff, sk)); 8753 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8754 bpf_target_off(struct sock_common, 8755 skc_num, 2, target_size)); 8756 break; 8757 8758 case offsetof(struct __sk_buff, tstamp): 8759 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 8760 8761 if (type == BPF_WRITE) 8762 *insn++ = BPF_STX_MEM(BPF_DW, 8763 si->dst_reg, si->src_reg, 8764 bpf_target_off(struct sk_buff, 8765 tstamp, 8, 8766 target_size)); 8767 else 8768 *insn++ = BPF_LDX_MEM(BPF_DW, 8769 si->dst_reg, si->src_reg, 8770 bpf_target_off(struct sk_buff, 8771 tstamp, 8, 8772 target_size)); 8773 break; 8774 8775 case offsetof(struct __sk_buff, gso_segs): 8776 insn = bpf_convert_shinfo_access(si, insn); 8777 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 8778 si->dst_reg, si->dst_reg, 8779 bpf_target_off(struct skb_shared_info, 8780 gso_segs, 2, 8781 target_size)); 8782 break; 8783 case offsetof(struct __sk_buff, gso_size): 8784 insn = bpf_convert_shinfo_access(si, insn); 8785 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), 8786 si->dst_reg, si->dst_reg, 8787 bpf_target_off(struct skb_shared_info, 8788 gso_size, 2, 8789 target_size)); 8790 break; 8791 case offsetof(struct __sk_buff, wire_len): 8792 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 8793 8794 off = si->off; 8795 off -= offsetof(struct __sk_buff, wire_len); 8796 off += offsetof(struct sk_buff, cb); 8797 off += offsetof(struct qdisc_skb_cb, pkt_len); 8798 *target_size = 4; 8799 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 8800 break; 8801 8802 case offsetof(struct __sk_buff, sk): 8803 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 8804 si->dst_reg, si->src_reg, 8805 offsetof(struct sk_buff, sk)); 8806 break; 8807 } 8808 8809 return insn - insn_buf; 8810 } 8811 8812 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 8813 const struct bpf_insn *si, 8814 struct bpf_insn *insn_buf, 8815 struct bpf_prog *prog, u32 *target_size) 8816 { 8817 struct bpf_insn *insn = insn_buf; 8818 int off; 8819 8820 switch (si->off) { 8821 case offsetof(struct bpf_sock, bound_dev_if): 8822 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 8823 8824 if (type == BPF_WRITE) 8825 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8826 offsetof(struct sock, sk_bound_dev_if)); 8827 else 8828 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8829 offsetof(struct sock, sk_bound_dev_if)); 8830 break; 8831 8832 case offsetof(struct bpf_sock, mark): 8833 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 8834 8835 if (type == BPF_WRITE) 8836 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8837 offsetof(struct sock, sk_mark)); 8838 else 8839 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8840 offsetof(struct sock, sk_mark)); 8841 break; 8842 8843 case offsetof(struct bpf_sock, priority): 8844 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 8845 8846 if (type == BPF_WRITE) 8847 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 8848 offsetof(struct sock, sk_priority)); 8849 else 8850 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 8851 offsetof(struct sock, sk_priority)); 8852 break; 8853 8854 case offsetof(struct bpf_sock, family): 8855 *insn++ = BPF_LDX_MEM( 8856 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 8857 si->dst_reg, si->src_reg, 8858 bpf_target_off(struct sock_common, 8859 skc_family, 8860 sizeof_field(struct sock_common, 8861 skc_family), 8862 target_size)); 8863 break; 8864 8865 case offsetof(struct bpf_sock, type): 8866 *insn++ = BPF_LDX_MEM( 8867 BPF_FIELD_SIZEOF(struct sock, sk_type), 8868 si->dst_reg, si->src_reg, 8869 bpf_target_off(struct sock, sk_type, 8870 sizeof_field(struct sock, sk_type), 8871 target_size)); 8872 break; 8873 8874 case offsetof(struct bpf_sock, protocol): 8875 *insn++ = BPF_LDX_MEM( 8876 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 8877 si->dst_reg, si->src_reg, 8878 bpf_target_off(struct sock, sk_protocol, 8879 sizeof_field(struct sock, sk_protocol), 8880 target_size)); 8881 break; 8882 8883 case offsetof(struct bpf_sock, src_ip4): 8884 *insn++ = BPF_LDX_MEM( 8885 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 8886 bpf_target_off(struct sock_common, skc_rcv_saddr, 8887 sizeof_field(struct sock_common, 8888 skc_rcv_saddr), 8889 target_size)); 8890 break; 8891 8892 case offsetof(struct bpf_sock, dst_ip4): 8893 *insn++ = BPF_LDX_MEM( 8894 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 8895 bpf_target_off(struct sock_common, skc_daddr, 8896 sizeof_field(struct sock_common, 8897 skc_daddr), 8898 target_size)); 8899 break; 8900 8901 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8902 #if IS_ENABLED(CONFIG_IPV6) 8903 off = si->off; 8904 off -= offsetof(struct bpf_sock, src_ip6[0]); 8905 *insn++ = BPF_LDX_MEM( 8906 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 8907 bpf_target_off( 8908 struct sock_common, 8909 skc_v6_rcv_saddr.s6_addr32[0], 8910 sizeof_field(struct sock_common, 8911 skc_v6_rcv_saddr.s6_addr32[0]), 8912 target_size) + off); 8913 #else 8914 (void)off; 8915 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8916 #endif 8917 break; 8918 8919 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 8920 #if IS_ENABLED(CONFIG_IPV6) 8921 off = si->off; 8922 off -= offsetof(struct bpf_sock, dst_ip6[0]); 8923 *insn++ = BPF_LDX_MEM( 8924 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 8925 bpf_target_off(struct sock_common, 8926 skc_v6_daddr.s6_addr32[0], 8927 sizeof_field(struct sock_common, 8928 skc_v6_daddr.s6_addr32[0]), 8929 target_size) + off); 8930 #else 8931 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8932 *target_size = 4; 8933 #endif 8934 break; 8935 8936 case offsetof(struct bpf_sock, src_port): 8937 *insn++ = BPF_LDX_MEM( 8938 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 8939 si->dst_reg, si->src_reg, 8940 bpf_target_off(struct sock_common, skc_num, 8941 sizeof_field(struct sock_common, 8942 skc_num), 8943 target_size)); 8944 break; 8945 8946 case offsetof(struct bpf_sock, dst_port): 8947 *insn++ = BPF_LDX_MEM( 8948 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 8949 si->dst_reg, si->src_reg, 8950 bpf_target_off(struct sock_common, skc_dport, 8951 sizeof_field(struct sock_common, 8952 skc_dport), 8953 target_size)); 8954 break; 8955 8956 case offsetof(struct bpf_sock, state): 8957 *insn++ = BPF_LDX_MEM( 8958 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 8959 si->dst_reg, si->src_reg, 8960 bpf_target_off(struct sock_common, skc_state, 8961 sizeof_field(struct sock_common, 8962 skc_state), 8963 target_size)); 8964 break; 8965 case offsetof(struct bpf_sock, rx_queue_mapping): 8966 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 8967 *insn++ = BPF_LDX_MEM( 8968 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), 8969 si->dst_reg, si->src_reg, 8970 bpf_target_off(struct sock, sk_rx_queue_mapping, 8971 sizeof_field(struct sock, 8972 sk_rx_queue_mapping), 8973 target_size)); 8974 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, 8975 1); 8976 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 8977 #else 8978 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 8979 *target_size = 2; 8980 #endif 8981 break; 8982 } 8983 8984 return insn - insn_buf; 8985 } 8986 8987 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 8988 const struct bpf_insn *si, 8989 struct bpf_insn *insn_buf, 8990 struct bpf_prog *prog, u32 *target_size) 8991 { 8992 struct bpf_insn *insn = insn_buf; 8993 8994 switch (si->off) { 8995 case offsetof(struct __sk_buff, ifindex): 8996 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 8997 si->dst_reg, si->src_reg, 8998 offsetof(struct sk_buff, dev)); 8999 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9000 bpf_target_off(struct net_device, ifindex, 4, 9001 target_size)); 9002 break; 9003 default: 9004 return bpf_convert_ctx_access(type, si, insn_buf, prog, 9005 target_size); 9006 } 9007 9008 return insn - insn_buf; 9009 } 9010 9011 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 9012 const struct bpf_insn *si, 9013 struct bpf_insn *insn_buf, 9014 struct bpf_prog *prog, u32 *target_size) 9015 { 9016 struct bpf_insn *insn = insn_buf; 9017 9018 switch (si->off) { 9019 case offsetof(struct xdp_md, data): 9020 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 9021 si->dst_reg, si->src_reg, 9022 offsetof(struct xdp_buff, data)); 9023 break; 9024 case offsetof(struct xdp_md, data_meta): 9025 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 9026 si->dst_reg, si->src_reg, 9027 offsetof(struct xdp_buff, data_meta)); 9028 break; 9029 case offsetof(struct xdp_md, data_end): 9030 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 9031 si->dst_reg, si->src_reg, 9032 offsetof(struct xdp_buff, data_end)); 9033 break; 9034 case offsetof(struct xdp_md, ingress_ifindex): 9035 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9036 si->dst_reg, si->src_reg, 9037 offsetof(struct xdp_buff, rxq)); 9038 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 9039 si->dst_reg, si->dst_reg, 9040 offsetof(struct xdp_rxq_info, dev)); 9041 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9042 offsetof(struct net_device, ifindex)); 9043 break; 9044 case offsetof(struct xdp_md, rx_queue_index): 9045 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9046 si->dst_reg, si->src_reg, 9047 offsetof(struct xdp_buff, rxq)); 9048 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9049 offsetof(struct xdp_rxq_info, 9050 queue_index)); 9051 break; 9052 case offsetof(struct xdp_md, egress_ifindex): 9053 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), 9054 si->dst_reg, si->src_reg, 9055 offsetof(struct xdp_buff, txq)); 9056 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), 9057 si->dst_reg, si->dst_reg, 9058 offsetof(struct xdp_txq_info, dev)); 9059 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9060 offsetof(struct net_device, ifindex)); 9061 break; 9062 } 9063 9064 return insn - insn_buf; 9065 } 9066 9067 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 9068 * context Structure, F is Field in context structure that contains a pointer 9069 * to Nested Structure of type NS that has the field NF. 9070 * 9071 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 9072 * sure that SIZE is not greater than actual size of S.F.NF. 9073 * 9074 * If offset OFF is provided, the load happens from that offset relative to 9075 * offset of NF. 9076 */ 9077 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 9078 do { \ 9079 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 9080 si->src_reg, offsetof(S, F)); \ 9081 *insn++ = BPF_LDX_MEM( \ 9082 SIZE, si->dst_reg, si->dst_reg, \ 9083 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 9084 target_size) \ 9085 + OFF); \ 9086 } while (0) 9087 9088 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 9089 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 9090 BPF_FIELD_SIZEOF(NS, NF), 0) 9091 9092 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 9093 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 9094 * 9095 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 9096 * "register" since two registers available in convert_ctx_access are not 9097 * enough: we can't override neither SRC, since it contains value to store, nor 9098 * DST since it contains pointer to context that may be used by later 9099 * instructions. But we need a temporary place to save pointer to nested 9100 * structure whose field we want to store to. 9101 */ 9102 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 9103 do { \ 9104 int tmp_reg = BPF_REG_9; \ 9105 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 9106 --tmp_reg; \ 9107 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 9108 --tmp_reg; \ 9109 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 9110 offsetof(S, TF)); \ 9111 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 9112 si->dst_reg, offsetof(S, F)); \ 9113 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ 9114 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 9115 target_size) \ 9116 + OFF); \ 9117 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 9118 offsetof(S, TF)); \ 9119 } while (0) 9120 9121 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 9122 TF) \ 9123 do { \ 9124 if (type == BPF_WRITE) { \ 9125 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 9126 OFF, TF); \ 9127 } else { \ 9128 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 9129 S, NS, F, NF, SIZE, OFF); \ 9130 } \ 9131 } while (0) 9132 9133 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 9134 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 9135 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 9136 9137 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 9138 const struct bpf_insn *si, 9139 struct bpf_insn *insn_buf, 9140 struct bpf_prog *prog, u32 *target_size) 9141 { 9142 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); 9143 struct bpf_insn *insn = insn_buf; 9144 9145 switch (si->off) { 9146 case offsetof(struct bpf_sock_addr, user_family): 9147 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 9148 struct sockaddr, uaddr, sa_family); 9149 break; 9150 9151 case offsetof(struct bpf_sock_addr, user_ip4): 9152 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 9153 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 9154 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 9155 break; 9156 9157 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 9158 off = si->off; 9159 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 9160 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 9161 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 9162 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 9163 tmp_reg); 9164 break; 9165 9166 case offsetof(struct bpf_sock_addr, user_port): 9167 /* To get port we need to know sa_family first and then treat 9168 * sockaddr as either sockaddr_in or sockaddr_in6. 9169 * Though we can simplify since port field has same offset and 9170 * size in both structures. 9171 * Here we check this invariant and use just one of the 9172 * structures if it's true. 9173 */ 9174 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 9175 offsetof(struct sockaddr_in6, sin6_port)); 9176 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 9177 sizeof_field(struct sockaddr_in6, sin6_port)); 9178 /* Account for sin6_port being smaller than user_port. */ 9179 port_size = min(port_size, BPF_LDST_BYTES(si)); 9180 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 9181 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 9182 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); 9183 break; 9184 9185 case offsetof(struct bpf_sock_addr, family): 9186 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 9187 struct sock, sk, sk_family); 9188 break; 9189 9190 case offsetof(struct bpf_sock_addr, type): 9191 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 9192 struct sock, sk, sk_type); 9193 break; 9194 9195 case offsetof(struct bpf_sock_addr, protocol): 9196 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 9197 struct sock, sk, sk_protocol); 9198 break; 9199 9200 case offsetof(struct bpf_sock_addr, msg_src_ip4): 9201 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 9202 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 9203 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 9204 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 9205 break; 9206 9207 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 9208 msg_src_ip6[3]): 9209 off = si->off; 9210 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 9211 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 9212 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 9213 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 9214 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 9215 break; 9216 case offsetof(struct bpf_sock_addr, sk): 9217 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 9218 si->dst_reg, si->src_reg, 9219 offsetof(struct bpf_sock_addr_kern, sk)); 9220 break; 9221 } 9222 9223 return insn - insn_buf; 9224 } 9225 9226 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 9227 const struct bpf_insn *si, 9228 struct bpf_insn *insn_buf, 9229 struct bpf_prog *prog, 9230 u32 *target_size) 9231 { 9232 struct bpf_insn *insn = insn_buf; 9233 int off; 9234 9235 /* Helper macro for adding read access to tcp_sock or sock fields. */ 9236 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 9237 do { \ 9238 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ 9239 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 9240 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 9241 if (si->dst_reg == reg || si->src_reg == reg) \ 9242 reg--; \ 9243 if (si->dst_reg == reg || si->src_reg == reg) \ 9244 reg--; \ 9245 if (si->dst_reg == si->src_reg) { \ 9246 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 9247 offsetof(struct bpf_sock_ops_kern, \ 9248 temp)); \ 9249 fullsock_reg = reg; \ 9250 jmp += 2; \ 9251 } \ 9252 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9253 struct bpf_sock_ops_kern, \ 9254 is_fullsock), \ 9255 fullsock_reg, si->src_reg, \ 9256 offsetof(struct bpf_sock_ops_kern, \ 9257 is_fullsock)); \ 9258 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 9259 if (si->dst_reg == si->src_reg) \ 9260 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 9261 offsetof(struct bpf_sock_ops_kern, \ 9262 temp)); \ 9263 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9264 struct bpf_sock_ops_kern, sk),\ 9265 si->dst_reg, si->src_reg, \ 9266 offsetof(struct bpf_sock_ops_kern, sk));\ 9267 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 9268 OBJ_FIELD), \ 9269 si->dst_reg, si->dst_reg, \ 9270 offsetof(OBJ, OBJ_FIELD)); \ 9271 if (si->dst_reg == si->src_reg) { \ 9272 *insn++ = BPF_JMP_A(1); \ 9273 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 9274 offsetof(struct bpf_sock_ops_kern, \ 9275 temp)); \ 9276 } \ 9277 } while (0) 9278 9279 #define SOCK_OPS_GET_SK() \ 9280 do { \ 9281 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ 9282 if (si->dst_reg == reg || si->src_reg == reg) \ 9283 reg--; \ 9284 if (si->dst_reg == reg || si->src_reg == reg) \ 9285 reg--; \ 9286 if (si->dst_reg == si->src_reg) { \ 9287 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 9288 offsetof(struct bpf_sock_ops_kern, \ 9289 temp)); \ 9290 fullsock_reg = reg; \ 9291 jmp += 2; \ 9292 } \ 9293 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9294 struct bpf_sock_ops_kern, \ 9295 is_fullsock), \ 9296 fullsock_reg, si->src_reg, \ 9297 offsetof(struct bpf_sock_ops_kern, \ 9298 is_fullsock)); \ 9299 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 9300 if (si->dst_reg == si->src_reg) \ 9301 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 9302 offsetof(struct bpf_sock_ops_kern, \ 9303 temp)); \ 9304 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9305 struct bpf_sock_ops_kern, sk),\ 9306 si->dst_reg, si->src_reg, \ 9307 offsetof(struct bpf_sock_ops_kern, sk));\ 9308 if (si->dst_reg == si->src_reg) { \ 9309 *insn++ = BPF_JMP_A(1); \ 9310 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 9311 offsetof(struct bpf_sock_ops_kern, \ 9312 temp)); \ 9313 } \ 9314 } while (0) 9315 9316 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 9317 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 9318 9319 /* Helper macro for adding write access to tcp_sock or sock fields. 9320 * The macro is called with two registers, dst_reg which contains a pointer 9321 * to ctx (context) and src_reg which contains the value that should be 9322 * stored. However, we need an additional register since we cannot overwrite 9323 * dst_reg because it may be used later in the program. 9324 * Instead we "borrow" one of the other register. We first save its value 9325 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 9326 * it at the end of the macro. 9327 */ 9328 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 9329 do { \ 9330 int reg = BPF_REG_9; \ 9331 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 9332 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 9333 if (si->dst_reg == reg || si->src_reg == reg) \ 9334 reg--; \ 9335 if (si->dst_reg == reg || si->src_reg == reg) \ 9336 reg--; \ 9337 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 9338 offsetof(struct bpf_sock_ops_kern, \ 9339 temp)); \ 9340 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9341 struct bpf_sock_ops_kern, \ 9342 is_fullsock), \ 9343 reg, si->dst_reg, \ 9344 offsetof(struct bpf_sock_ops_kern, \ 9345 is_fullsock)); \ 9346 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 9347 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 9348 struct bpf_sock_ops_kern, sk),\ 9349 reg, si->dst_reg, \ 9350 offsetof(struct bpf_sock_ops_kern, sk));\ 9351 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ 9352 reg, si->src_reg, \ 9353 offsetof(OBJ, OBJ_FIELD)); \ 9354 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 9355 offsetof(struct bpf_sock_ops_kern, \ 9356 temp)); \ 9357 } while (0) 9358 9359 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 9360 do { \ 9361 if (TYPE == BPF_WRITE) \ 9362 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 9363 else \ 9364 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 9365 } while (0) 9366 9367 if (insn > insn_buf) 9368 return insn - insn_buf; 9369 9370 switch (si->off) { 9371 case offsetof(struct bpf_sock_ops, op): 9372 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 9373 op), 9374 si->dst_reg, si->src_reg, 9375 offsetof(struct bpf_sock_ops_kern, op)); 9376 break; 9377 9378 case offsetof(struct bpf_sock_ops, replylong[0]) ... 9379 offsetof(struct bpf_sock_ops, replylong[3]): 9380 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 9381 sizeof_field(struct bpf_sock_ops_kern, reply)); 9382 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 9383 sizeof_field(struct bpf_sock_ops_kern, replylong)); 9384 off = si->off; 9385 off -= offsetof(struct bpf_sock_ops, replylong[0]); 9386 off += offsetof(struct bpf_sock_ops_kern, replylong[0]); 9387 if (type == BPF_WRITE) 9388 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 9389 off); 9390 else 9391 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9392 off); 9393 break; 9394 9395 case offsetof(struct bpf_sock_ops, family): 9396 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9397 9398 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9399 struct bpf_sock_ops_kern, sk), 9400 si->dst_reg, si->src_reg, 9401 offsetof(struct bpf_sock_ops_kern, sk)); 9402 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9403 offsetof(struct sock_common, skc_family)); 9404 break; 9405 9406 case offsetof(struct bpf_sock_ops, remote_ip4): 9407 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9408 9409 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9410 struct bpf_sock_ops_kern, sk), 9411 si->dst_reg, si->src_reg, 9412 offsetof(struct bpf_sock_ops_kern, sk)); 9413 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9414 offsetof(struct sock_common, skc_daddr)); 9415 break; 9416 9417 case offsetof(struct bpf_sock_ops, local_ip4): 9418 BUILD_BUG_ON(sizeof_field(struct sock_common, 9419 skc_rcv_saddr) != 4); 9420 9421 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9422 struct bpf_sock_ops_kern, sk), 9423 si->dst_reg, si->src_reg, 9424 offsetof(struct bpf_sock_ops_kern, sk)); 9425 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9426 offsetof(struct sock_common, 9427 skc_rcv_saddr)); 9428 break; 9429 9430 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 9431 offsetof(struct bpf_sock_ops, remote_ip6[3]): 9432 #if IS_ENABLED(CONFIG_IPV6) 9433 BUILD_BUG_ON(sizeof_field(struct sock_common, 9434 skc_v6_daddr.s6_addr32[0]) != 4); 9435 9436 off = si->off; 9437 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 9438 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9439 struct bpf_sock_ops_kern, sk), 9440 si->dst_reg, si->src_reg, 9441 offsetof(struct bpf_sock_ops_kern, sk)); 9442 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9443 offsetof(struct sock_common, 9444 skc_v6_daddr.s6_addr32[0]) + 9445 off); 9446 #else 9447 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9448 #endif 9449 break; 9450 9451 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 9452 offsetof(struct bpf_sock_ops, local_ip6[3]): 9453 #if IS_ENABLED(CONFIG_IPV6) 9454 BUILD_BUG_ON(sizeof_field(struct sock_common, 9455 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9456 9457 off = si->off; 9458 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 9459 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9460 struct bpf_sock_ops_kern, sk), 9461 si->dst_reg, si->src_reg, 9462 offsetof(struct bpf_sock_ops_kern, sk)); 9463 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9464 offsetof(struct sock_common, 9465 skc_v6_rcv_saddr.s6_addr32[0]) + 9466 off); 9467 #else 9468 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9469 #endif 9470 break; 9471 9472 case offsetof(struct bpf_sock_ops, remote_port): 9473 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9474 9475 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9476 struct bpf_sock_ops_kern, sk), 9477 si->dst_reg, si->src_reg, 9478 offsetof(struct bpf_sock_ops_kern, sk)); 9479 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9480 offsetof(struct sock_common, skc_dport)); 9481 #ifndef __BIG_ENDIAN_BITFIELD 9482 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9483 #endif 9484 break; 9485 9486 case offsetof(struct bpf_sock_ops, local_port): 9487 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9488 9489 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9490 struct bpf_sock_ops_kern, sk), 9491 si->dst_reg, si->src_reg, 9492 offsetof(struct bpf_sock_ops_kern, sk)); 9493 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9494 offsetof(struct sock_common, skc_num)); 9495 break; 9496 9497 case offsetof(struct bpf_sock_ops, is_fullsock): 9498 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9499 struct bpf_sock_ops_kern, 9500 is_fullsock), 9501 si->dst_reg, si->src_reg, 9502 offsetof(struct bpf_sock_ops_kern, 9503 is_fullsock)); 9504 break; 9505 9506 case offsetof(struct bpf_sock_ops, state): 9507 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 9508 9509 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9510 struct bpf_sock_ops_kern, sk), 9511 si->dst_reg, si->src_reg, 9512 offsetof(struct bpf_sock_ops_kern, sk)); 9513 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 9514 offsetof(struct sock_common, skc_state)); 9515 break; 9516 9517 case offsetof(struct bpf_sock_ops, rtt_min): 9518 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 9519 sizeof(struct minmax)); 9520 BUILD_BUG_ON(sizeof(struct minmax) < 9521 sizeof(struct minmax_sample)); 9522 9523 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9524 struct bpf_sock_ops_kern, sk), 9525 si->dst_reg, si->src_reg, 9526 offsetof(struct bpf_sock_ops_kern, sk)); 9527 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9528 offsetof(struct tcp_sock, rtt_min) + 9529 sizeof_field(struct minmax_sample, t)); 9530 break; 9531 9532 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 9533 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 9534 struct tcp_sock); 9535 break; 9536 9537 case offsetof(struct bpf_sock_ops, sk_txhash): 9538 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 9539 struct sock, type); 9540 break; 9541 case offsetof(struct bpf_sock_ops, snd_cwnd): 9542 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 9543 break; 9544 case offsetof(struct bpf_sock_ops, srtt_us): 9545 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 9546 break; 9547 case offsetof(struct bpf_sock_ops, snd_ssthresh): 9548 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 9549 break; 9550 case offsetof(struct bpf_sock_ops, rcv_nxt): 9551 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 9552 break; 9553 case offsetof(struct bpf_sock_ops, snd_nxt): 9554 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 9555 break; 9556 case offsetof(struct bpf_sock_ops, snd_una): 9557 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 9558 break; 9559 case offsetof(struct bpf_sock_ops, mss_cache): 9560 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 9561 break; 9562 case offsetof(struct bpf_sock_ops, ecn_flags): 9563 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 9564 break; 9565 case offsetof(struct bpf_sock_ops, rate_delivered): 9566 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 9567 break; 9568 case offsetof(struct bpf_sock_ops, rate_interval_us): 9569 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 9570 break; 9571 case offsetof(struct bpf_sock_ops, packets_out): 9572 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 9573 break; 9574 case offsetof(struct bpf_sock_ops, retrans_out): 9575 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 9576 break; 9577 case offsetof(struct bpf_sock_ops, total_retrans): 9578 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 9579 break; 9580 case offsetof(struct bpf_sock_ops, segs_in): 9581 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 9582 break; 9583 case offsetof(struct bpf_sock_ops, data_segs_in): 9584 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 9585 break; 9586 case offsetof(struct bpf_sock_ops, segs_out): 9587 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 9588 break; 9589 case offsetof(struct bpf_sock_ops, data_segs_out): 9590 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 9591 break; 9592 case offsetof(struct bpf_sock_ops, lost_out): 9593 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 9594 break; 9595 case offsetof(struct bpf_sock_ops, sacked_out): 9596 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 9597 break; 9598 case offsetof(struct bpf_sock_ops, bytes_received): 9599 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 9600 break; 9601 case offsetof(struct bpf_sock_ops, bytes_acked): 9602 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 9603 break; 9604 case offsetof(struct bpf_sock_ops, sk): 9605 SOCK_OPS_GET_SK(); 9606 break; 9607 case offsetof(struct bpf_sock_ops, skb_data_end): 9608 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 9609 skb_data_end), 9610 si->dst_reg, si->src_reg, 9611 offsetof(struct bpf_sock_ops_kern, 9612 skb_data_end)); 9613 break; 9614 case offsetof(struct bpf_sock_ops, skb_data): 9615 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 9616 skb), 9617 si->dst_reg, si->src_reg, 9618 offsetof(struct bpf_sock_ops_kern, 9619 skb)); 9620 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9621 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9622 si->dst_reg, si->dst_reg, 9623 offsetof(struct sk_buff, data)); 9624 break; 9625 case offsetof(struct bpf_sock_ops, skb_len): 9626 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 9627 skb), 9628 si->dst_reg, si->src_reg, 9629 offsetof(struct bpf_sock_ops_kern, 9630 skb)); 9631 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9632 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 9633 si->dst_reg, si->dst_reg, 9634 offsetof(struct sk_buff, len)); 9635 break; 9636 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 9637 off = offsetof(struct sk_buff, cb); 9638 off += offsetof(struct tcp_skb_cb, tcp_flags); 9639 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags); 9640 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 9641 skb), 9642 si->dst_reg, si->src_reg, 9643 offsetof(struct bpf_sock_ops_kern, 9644 skb)); 9645 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9646 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb, 9647 tcp_flags), 9648 si->dst_reg, si->dst_reg, off); 9649 break; 9650 } 9651 return insn - insn_buf; 9652 } 9653 9654 /* data_end = skb->data + skb_headlen() */ 9655 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si, 9656 struct bpf_insn *insn) 9657 { 9658 /* si->dst_reg = skb->data */ 9659 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9660 si->dst_reg, si->src_reg, 9661 offsetof(struct sk_buff, data)); 9662 /* AX = skb->len */ 9663 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 9664 BPF_REG_AX, si->src_reg, 9665 offsetof(struct sk_buff, len)); 9666 /* si->dst_reg = skb->data + skb->len */ 9667 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); 9668 /* AX = skb->data_len */ 9669 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len), 9670 BPF_REG_AX, si->src_reg, 9671 offsetof(struct sk_buff, data_len)); 9672 /* si->dst_reg = skb->data + skb->len - skb->data_len */ 9673 *insn++ = BPF_ALU64_REG(BPF_SUB, si->dst_reg, BPF_REG_AX); 9674 9675 return insn; 9676 } 9677 9678 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 9679 const struct bpf_insn *si, 9680 struct bpf_insn *insn_buf, 9681 struct bpf_prog *prog, u32 *target_size) 9682 { 9683 struct bpf_insn *insn = insn_buf; 9684 9685 switch (si->off) { 9686 case offsetof(struct __sk_buff, data_end): 9687 insn = bpf_convert_data_end_access(si, insn); 9688 break; 9689 default: 9690 return bpf_convert_ctx_access(type, si, insn_buf, prog, 9691 target_size); 9692 } 9693 9694 return insn - insn_buf; 9695 } 9696 9697 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 9698 const struct bpf_insn *si, 9699 struct bpf_insn *insn_buf, 9700 struct bpf_prog *prog, u32 *target_size) 9701 { 9702 struct bpf_insn *insn = insn_buf; 9703 #if IS_ENABLED(CONFIG_IPV6) 9704 int off; 9705 #endif 9706 9707 /* convert ctx uses the fact sg element is first in struct */ 9708 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 9709 9710 switch (si->off) { 9711 case offsetof(struct sk_msg_md, data): 9712 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 9713 si->dst_reg, si->src_reg, 9714 offsetof(struct sk_msg, data)); 9715 break; 9716 case offsetof(struct sk_msg_md, data_end): 9717 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 9718 si->dst_reg, si->src_reg, 9719 offsetof(struct sk_msg, data_end)); 9720 break; 9721 case offsetof(struct sk_msg_md, family): 9722 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9723 9724 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9725 struct sk_msg, sk), 9726 si->dst_reg, si->src_reg, 9727 offsetof(struct sk_msg, sk)); 9728 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9729 offsetof(struct sock_common, skc_family)); 9730 break; 9731 9732 case offsetof(struct sk_msg_md, remote_ip4): 9733 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9734 9735 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9736 struct sk_msg, sk), 9737 si->dst_reg, si->src_reg, 9738 offsetof(struct sk_msg, sk)); 9739 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9740 offsetof(struct sock_common, skc_daddr)); 9741 break; 9742 9743 case offsetof(struct sk_msg_md, local_ip4): 9744 BUILD_BUG_ON(sizeof_field(struct sock_common, 9745 skc_rcv_saddr) != 4); 9746 9747 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9748 struct sk_msg, sk), 9749 si->dst_reg, si->src_reg, 9750 offsetof(struct sk_msg, sk)); 9751 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9752 offsetof(struct sock_common, 9753 skc_rcv_saddr)); 9754 break; 9755 9756 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 9757 offsetof(struct sk_msg_md, remote_ip6[3]): 9758 #if IS_ENABLED(CONFIG_IPV6) 9759 BUILD_BUG_ON(sizeof_field(struct sock_common, 9760 skc_v6_daddr.s6_addr32[0]) != 4); 9761 9762 off = si->off; 9763 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 9764 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9765 struct sk_msg, sk), 9766 si->dst_reg, si->src_reg, 9767 offsetof(struct sk_msg, sk)); 9768 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9769 offsetof(struct sock_common, 9770 skc_v6_daddr.s6_addr32[0]) + 9771 off); 9772 #else 9773 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9774 #endif 9775 break; 9776 9777 case offsetof(struct sk_msg_md, local_ip6[0]) ... 9778 offsetof(struct sk_msg_md, local_ip6[3]): 9779 #if IS_ENABLED(CONFIG_IPV6) 9780 BUILD_BUG_ON(sizeof_field(struct sock_common, 9781 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9782 9783 off = si->off; 9784 off -= offsetof(struct sk_msg_md, local_ip6[0]); 9785 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9786 struct sk_msg, sk), 9787 si->dst_reg, si->src_reg, 9788 offsetof(struct sk_msg, sk)); 9789 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9790 offsetof(struct sock_common, 9791 skc_v6_rcv_saddr.s6_addr32[0]) + 9792 off); 9793 #else 9794 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9795 #endif 9796 break; 9797 9798 case offsetof(struct sk_msg_md, remote_port): 9799 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9800 9801 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9802 struct sk_msg, sk), 9803 si->dst_reg, si->src_reg, 9804 offsetof(struct sk_msg, sk)); 9805 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9806 offsetof(struct sock_common, skc_dport)); 9807 #ifndef __BIG_ENDIAN_BITFIELD 9808 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9809 #endif 9810 break; 9811 9812 case offsetof(struct sk_msg_md, local_port): 9813 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9814 9815 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 9816 struct sk_msg, sk), 9817 si->dst_reg, si->src_reg, 9818 offsetof(struct sk_msg, sk)); 9819 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9820 offsetof(struct sock_common, skc_num)); 9821 break; 9822 9823 case offsetof(struct sk_msg_md, size): 9824 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 9825 si->dst_reg, si->src_reg, 9826 offsetof(struct sk_msg_sg, size)); 9827 break; 9828 9829 case offsetof(struct sk_msg_md, sk): 9830 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), 9831 si->dst_reg, si->src_reg, 9832 offsetof(struct sk_msg, sk)); 9833 break; 9834 } 9835 9836 return insn - insn_buf; 9837 } 9838 9839 const struct bpf_verifier_ops sk_filter_verifier_ops = { 9840 .get_func_proto = sk_filter_func_proto, 9841 .is_valid_access = sk_filter_is_valid_access, 9842 .convert_ctx_access = bpf_convert_ctx_access, 9843 .gen_ld_abs = bpf_gen_ld_abs, 9844 }; 9845 9846 const struct bpf_prog_ops sk_filter_prog_ops = { 9847 .test_run = bpf_prog_test_run_skb, 9848 }; 9849 9850 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 9851 .get_func_proto = tc_cls_act_func_proto, 9852 .is_valid_access = tc_cls_act_is_valid_access, 9853 .convert_ctx_access = tc_cls_act_convert_ctx_access, 9854 .gen_prologue = tc_cls_act_prologue, 9855 .gen_ld_abs = bpf_gen_ld_abs, 9856 .check_kfunc_call = bpf_prog_test_check_kfunc_call, 9857 }; 9858 9859 const struct bpf_prog_ops tc_cls_act_prog_ops = { 9860 .test_run = bpf_prog_test_run_skb, 9861 }; 9862 9863 const struct bpf_verifier_ops xdp_verifier_ops = { 9864 .get_func_proto = xdp_func_proto, 9865 .is_valid_access = xdp_is_valid_access, 9866 .convert_ctx_access = xdp_convert_ctx_access, 9867 .gen_prologue = bpf_noop_prologue, 9868 }; 9869 9870 const struct bpf_prog_ops xdp_prog_ops = { 9871 .test_run = bpf_prog_test_run_xdp, 9872 }; 9873 9874 const struct bpf_verifier_ops cg_skb_verifier_ops = { 9875 .get_func_proto = cg_skb_func_proto, 9876 .is_valid_access = cg_skb_is_valid_access, 9877 .convert_ctx_access = bpf_convert_ctx_access, 9878 }; 9879 9880 const struct bpf_prog_ops cg_skb_prog_ops = { 9881 .test_run = bpf_prog_test_run_skb, 9882 }; 9883 9884 const struct bpf_verifier_ops lwt_in_verifier_ops = { 9885 .get_func_proto = lwt_in_func_proto, 9886 .is_valid_access = lwt_is_valid_access, 9887 .convert_ctx_access = bpf_convert_ctx_access, 9888 }; 9889 9890 const struct bpf_prog_ops lwt_in_prog_ops = { 9891 .test_run = bpf_prog_test_run_skb, 9892 }; 9893 9894 const struct bpf_verifier_ops lwt_out_verifier_ops = { 9895 .get_func_proto = lwt_out_func_proto, 9896 .is_valid_access = lwt_is_valid_access, 9897 .convert_ctx_access = bpf_convert_ctx_access, 9898 }; 9899 9900 const struct bpf_prog_ops lwt_out_prog_ops = { 9901 .test_run = bpf_prog_test_run_skb, 9902 }; 9903 9904 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 9905 .get_func_proto = lwt_xmit_func_proto, 9906 .is_valid_access = lwt_is_valid_access, 9907 .convert_ctx_access = bpf_convert_ctx_access, 9908 .gen_prologue = tc_cls_act_prologue, 9909 }; 9910 9911 const struct bpf_prog_ops lwt_xmit_prog_ops = { 9912 .test_run = bpf_prog_test_run_skb, 9913 }; 9914 9915 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 9916 .get_func_proto = lwt_seg6local_func_proto, 9917 .is_valid_access = lwt_is_valid_access, 9918 .convert_ctx_access = bpf_convert_ctx_access, 9919 }; 9920 9921 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 9922 .test_run = bpf_prog_test_run_skb, 9923 }; 9924 9925 const struct bpf_verifier_ops cg_sock_verifier_ops = { 9926 .get_func_proto = sock_filter_func_proto, 9927 .is_valid_access = sock_filter_is_valid_access, 9928 .convert_ctx_access = bpf_sock_convert_ctx_access, 9929 }; 9930 9931 const struct bpf_prog_ops cg_sock_prog_ops = { 9932 }; 9933 9934 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 9935 .get_func_proto = sock_addr_func_proto, 9936 .is_valid_access = sock_addr_is_valid_access, 9937 .convert_ctx_access = sock_addr_convert_ctx_access, 9938 }; 9939 9940 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 9941 }; 9942 9943 const struct bpf_verifier_ops sock_ops_verifier_ops = { 9944 .get_func_proto = sock_ops_func_proto, 9945 .is_valid_access = sock_ops_is_valid_access, 9946 .convert_ctx_access = sock_ops_convert_ctx_access, 9947 }; 9948 9949 const struct bpf_prog_ops sock_ops_prog_ops = { 9950 }; 9951 9952 const struct bpf_verifier_ops sk_skb_verifier_ops = { 9953 .get_func_proto = sk_skb_func_proto, 9954 .is_valid_access = sk_skb_is_valid_access, 9955 .convert_ctx_access = sk_skb_convert_ctx_access, 9956 .gen_prologue = sk_skb_prologue, 9957 }; 9958 9959 const struct bpf_prog_ops sk_skb_prog_ops = { 9960 }; 9961 9962 const struct bpf_verifier_ops sk_msg_verifier_ops = { 9963 .get_func_proto = sk_msg_func_proto, 9964 .is_valid_access = sk_msg_is_valid_access, 9965 .convert_ctx_access = sk_msg_convert_ctx_access, 9966 .gen_prologue = bpf_noop_prologue, 9967 }; 9968 9969 const struct bpf_prog_ops sk_msg_prog_ops = { 9970 }; 9971 9972 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 9973 .get_func_proto = flow_dissector_func_proto, 9974 .is_valid_access = flow_dissector_is_valid_access, 9975 .convert_ctx_access = flow_dissector_convert_ctx_access, 9976 }; 9977 9978 const struct bpf_prog_ops flow_dissector_prog_ops = { 9979 .test_run = bpf_prog_test_run_flow_dissector, 9980 }; 9981 9982 int sk_detach_filter(struct sock *sk) 9983 { 9984 int ret = -ENOENT; 9985 struct sk_filter *filter; 9986 9987 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 9988 return -EPERM; 9989 9990 filter = rcu_dereference_protected(sk->sk_filter, 9991 lockdep_sock_is_held(sk)); 9992 if (filter) { 9993 RCU_INIT_POINTER(sk->sk_filter, NULL); 9994 sk_filter_uncharge(sk, filter); 9995 ret = 0; 9996 } 9997 9998 return ret; 9999 } 10000 EXPORT_SYMBOL_GPL(sk_detach_filter); 10001 10002 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, 10003 unsigned int len) 10004 { 10005 struct sock_fprog_kern *fprog; 10006 struct sk_filter *filter; 10007 int ret = 0; 10008 10009 lock_sock(sk); 10010 filter = rcu_dereference_protected(sk->sk_filter, 10011 lockdep_sock_is_held(sk)); 10012 if (!filter) 10013 goto out; 10014 10015 /* We're copying the filter that has been originally attached, 10016 * so no conversion/decode needed anymore. eBPF programs that 10017 * have no original program cannot be dumped through this. 10018 */ 10019 ret = -EACCES; 10020 fprog = filter->prog->orig_prog; 10021 if (!fprog) 10022 goto out; 10023 10024 ret = fprog->len; 10025 if (!len) 10026 /* User space only enquires number of filter blocks. */ 10027 goto out; 10028 10029 ret = -EINVAL; 10030 if (len < fprog->len) 10031 goto out; 10032 10033 ret = -EFAULT; 10034 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) 10035 goto out; 10036 10037 /* Instead of bytes, the API requests to return the number 10038 * of filter blocks. 10039 */ 10040 ret = fprog->len; 10041 out: 10042 release_sock(sk); 10043 return ret; 10044 } 10045 10046 #ifdef CONFIG_INET 10047 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 10048 struct sock_reuseport *reuse, 10049 struct sock *sk, struct sk_buff *skb, 10050 struct sock *migrating_sk, 10051 u32 hash) 10052 { 10053 reuse_kern->skb = skb; 10054 reuse_kern->sk = sk; 10055 reuse_kern->selected_sk = NULL; 10056 reuse_kern->migrating_sk = migrating_sk; 10057 reuse_kern->data_end = skb->data + skb_headlen(skb); 10058 reuse_kern->hash = hash; 10059 reuse_kern->reuseport_id = reuse->reuseport_id; 10060 reuse_kern->bind_inany = reuse->bind_inany; 10061 } 10062 10063 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 10064 struct bpf_prog *prog, struct sk_buff *skb, 10065 struct sock *migrating_sk, 10066 u32 hash) 10067 { 10068 struct sk_reuseport_kern reuse_kern; 10069 enum sk_action action; 10070 10071 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash); 10072 action = BPF_PROG_RUN(prog, &reuse_kern); 10073 10074 if (action == SK_PASS) 10075 return reuse_kern.selected_sk; 10076 else 10077 return ERR_PTR(-ECONNREFUSED); 10078 } 10079 10080 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 10081 struct bpf_map *, map, void *, key, u32, flags) 10082 { 10083 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; 10084 struct sock_reuseport *reuse; 10085 struct sock *selected_sk; 10086 10087 selected_sk = map->ops->map_lookup_elem(map, key); 10088 if (!selected_sk) 10089 return -ENOENT; 10090 10091 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 10092 if (!reuse) { 10093 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ 10094 if (sk_is_refcounted(selected_sk)) 10095 sock_put(selected_sk); 10096 10097 /* reuseport_array has only sk with non NULL sk_reuseport_cb. 10098 * The only (!reuse) case here is - the sk has already been 10099 * unhashed (e.g. by close()), so treat it as -ENOENT. 10100 * 10101 * Other maps (e.g. sock_map) do not provide this guarantee and 10102 * the sk may never be in the reuseport group to begin with. 10103 */ 10104 return is_sockarray ? -ENOENT : -EINVAL; 10105 } 10106 10107 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 10108 struct sock *sk = reuse_kern->sk; 10109 10110 if (sk->sk_protocol != selected_sk->sk_protocol) 10111 return -EPROTOTYPE; 10112 else if (sk->sk_family != selected_sk->sk_family) 10113 return -EAFNOSUPPORT; 10114 10115 /* Catch all. Likely bound to a different sockaddr. */ 10116 return -EBADFD; 10117 } 10118 10119 reuse_kern->selected_sk = selected_sk; 10120 10121 return 0; 10122 } 10123 10124 static const struct bpf_func_proto sk_select_reuseport_proto = { 10125 .func = sk_select_reuseport, 10126 .gpl_only = false, 10127 .ret_type = RET_INTEGER, 10128 .arg1_type = ARG_PTR_TO_CTX, 10129 .arg2_type = ARG_CONST_MAP_PTR, 10130 .arg3_type = ARG_PTR_TO_MAP_KEY, 10131 .arg4_type = ARG_ANYTHING, 10132 }; 10133 10134 BPF_CALL_4(sk_reuseport_load_bytes, 10135 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 10136 void *, to, u32, len) 10137 { 10138 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 10139 } 10140 10141 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 10142 .func = sk_reuseport_load_bytes, 10143 .gpl_only = false, 10144 .ret_type = RET_INTEGER, 10145 .arg1_type = ARG_PTR_TO_CTX, 10146 .arg2_type = ARG_ANYTHING, 10147 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 10148 .arg4_type = ARG_CONST_SIZE, 10149 }; 10150 10151 BPF_CALL_5(sk_reuseport_load_bytes_relative, 10152 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 10153 void *, to, u32, len, u32, start_header) 10154 { 10155 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 10156 len, start_header); 10157 } 10158 10159 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 10160 .func = sk_reuseport_load_bytes_relative, 10161 .gpl_only = false, 10162 .ret_type = RET_INTEGER, 10163 .arg1_type = ARG_PTR_TO_CTX, 10164 .arg2_type = ARG_ANYTHING, 10165 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 10166 .arg4_type = ARG_CONST_SIZE, 10167 .arg5_type = ARG_ANYTHING, 10168 }; 10169 10170 static const struct bpf_func_proto * 10171 sk_reuseport_func_proto(enum bpf_func_id func_id, 10172 const struct bpf_prog *prog) 10173 { 10174 switch (func_id) { 10175 case BPF_FUNC_sk_select_reuseport: 10176 return &sk_select_reuseport_proto; 10177 case BPF_FUNC_skb_load_bytes: 10178 return &sk_reuseport_load_bytes_proto; 10179 case BPF_FUNC_skb_load_bytes_relative: 10180 return &sk_reuseport_load_bytes_relative_proto; 10181 case BPF_FUNC_get_socket_cookie: 10182 return &bpf_get_socket_ptr_cookie_proto; 10183 default: 10184 return bpf_base_func_proto(func_id); 10185 } 10186 } 10187 10188 static bool 10189 sk_reuseport_is_valid_access(int off, int size, 10190 enum bpf_access_type type, 10191 const struct bpf_prog *prog, 10192 struct bpf_insn_access_aux *info) 10193 { 10194 const u32 size_default = sizeof(__u32); 10195 10196 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 10197 off % size || type != BPF_READ) 10198 return false; 10199 10200 switch (off) { 10201 case offsetof(struct sk_reuseport_md, data): 10202 info->reg_type = PTR_TO_PACKET; 10203 return size == sizeof(__u64); 10204 10205 case offsetof(struct sk_reuseport_md, data_end): 10206 info->reg_type = PTR_TO_PACKET_END; 10207 return size == sizeof(__u64); 10208 10209 case offsetof(struct sk_reuseport_md, hash): 10210 return size == size_default; 10211 10212 case offsetof(struct sk_reuseport_md, sk): 10213 info->reg_type = PTR_TO_SOCKET; 10214 return size == sizeof(__u64); 10215 10216 case offsetof(struct sk_reuseport_md, migrating_sk): 10217 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 10218 return size == sizeof(__u64); 10219 10220 /* Fields that allow narrowing */ 10221 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 10222 if (size < sizeof_field(struct sk_buff, protocol)) 10223 return false; 10224 fallthrough; 10225 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 10226 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 10227 case bpf_ctx_range(struct sk_reuseport_md, len): 10228 bpf_ctx_record_field_size(info, size_default); 10229 return bpf_ctx_narrow_access_ok(off, size, size_default); 10230 10231 default: 10232 return false; 10233 } 10234 } 10235 10236 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 10237 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 10238 si->dst_reg, si->src_reg, \ 10239 bpf_target_off(struct sk_reuseport_kern, F, \ 10240 sizeof_field(struct sk_reuseport_kern, F), \ 10241 target_size)); \ 10242 }) 10243 10244 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 10245 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 10246 struct sk_buff, \ 10247 skb, \ 10248 SKB_FIELD) 10249 10250 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 10251 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 10252 struct sock, \ 10253 sk, \ 10254 SK_FIELD) 10255 10256 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 10257 const struct bpf_insn *si, 10258 struct bpf_insn *insn_buf, 10259 struct bpf_prog *prog, 10260 u32 *target_size) 10261 { 10262 struct bpf_insn *insn = insn_buf; 10263 10264 switch (si->off) { 10265 case offsetof(struct sk_reuseport_md, data): 10266 SK_REUSEPORT_LOAD_SKB_FIELD(data); 10267 break; 10268 10269 case offsetof(struct sk_reuseport_md, len): 10270 SK_REUSEPORT_LOAD_SKB_FIELD(len); 10271 break; 10272 10273 case offsetof(struct sk_reuseport_md, eth_protocol): 10274 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 10275 break; 10276 10277 case offsetof(struct sk_reuseport_md, ip_protocol): 10278 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 10279 break; 10280 10281 case offsetof(struct sk_reuseport_md, data_end): 10282 SK_REUSEPORT_LOAD_FIELD(data_end); 10283 break; 10284 10285 case offsetof(struct sk_reuseport_md, hash): 10286 SK_REUSEPORT_LOAD_FIELD(hash); 10287 break; 10288 10289 case offsetof(struct sk_reuseport_md, bind_inany): 10290 SK_REUSEPORT_LOAD_FIELD(bind_inany); 10291 break; 10292 10293 case offsetof(struct sk_reuseport_md, sk): 10294 SK_REUSEPORT_LOAD_FIELD(sk); 10295 break; 10296 10297 case offsetof(struct sk_reuseport_md, migrating_sk): 10298 SK_REUSEPORT_LOAD_FIELD(migrating_sk); 10299 break; 10300 } 10301 10302 return insn - insn_buf; 10303 } 10304 10305 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 10306 .get_func_proto = sk_reuseport_func_proto, 10307 .is_valid_access = sk_reuseport_is_valid_access, 10308 .convert_ctx_access = sk_reuseport_convert_ctx_access, 10309 }; 10310 10311 const struct bpf_prog_ops sk_reuseport_prog_ops = { 10312 }; 10313 10314 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); 10315 EXPORT_SYMBOL(bpf_sk_lookup_enabled); 10316 10317 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, 10318 struct sock *, sk, u64, flags) 10319 { 10320 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | 10321 BPF_SK_LOOKUP_F_NO_REUSEPORT))) 10322 return -EINVAL; 10323 if (unlikely(sk && sk_is_refcounted(sk))) 10324 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ 10325 if (unlikely(sk && sk->sk_state == TCP_ESTABLISHED)) 10326 return -ESOCKTNOSUPPORT; /* reject connected sockets */ 10327 10328 /* Check if socket is suitable for packet L3/L4 protocol */ 10329 if (sk && sk->sk_protocol != ctx->protocol) 10330 return -EPROTOTYPE; 10331 if (sk && sk->sk_family != ctx->family && 10332 (sk->sk_family == AF_INET || ipv6_only_sock(sk))) 10333 return -EAFNOSUPPORT; 10334 10335 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) 10336 return -EEXIST; 10337 10338 /* Select socket as lookup result */ 10339 ctx->selected_sk = sk; 10340 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; 10341 return 0; 10342 } 10343 10344 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { 10345 .func = bpf_sk_lookup_assign, 10346 .gpl_only = false, 10347 .ret_type = RET_INTEGER, 10348 .arg1_type = ARG_PTR_TO_CTX, 10349 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, 10350 .arg3_type = ARG_ANYTHING, 10351 }; 10352 10353 static const struct bpf_func_proto * 10354 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 10355 { 10356 switch (func_id) { 10357 case BPF_FUNC_perf_event_output: 10358 return &bpf_event_output_data_proto; 10359 case BPF_FUNC_sk_assign: 10360 return &bpf_sk_lookup_assign_proto; 10361 case BPF_FUNC_sk_release: 10362 return &bpf_sk_release_proto; 10363 default: 10364 return bpf_sk_base_func_proto(func_id); 10365 } 10366 } 10367 10368 static bool sk_lookup_is_valid_access(int off, int size, 10369 enum bpf_access_type type, 10370 const struct bpf_prog *prog, 10371 struct bpf_insn_access_aux *info) 10372 { 10373 if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) 10374 return false; 10375 if (off % size != 0) 10376 return false; 10377 if (type != BPF_READ) 10378 return false; 10379 10380 switch (off) { 10381 case offsetof(struct bpf_sk_lookup, sk): 10382 info->reg_type = PTR_TO_SOCKET_OR_NULL; 10383 return size == sizeof(__u64); 10384 10385 case bpf_ctx_range(struct bpf_sk_lookup, family): 10386 case bpf_ctx_range(struct bpf_sk_lookup, protocol): 10387 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): 10388 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): 10389 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): 10390 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): 10391 case bpf_ctx_range(struct bpf_sk_lookup, remote_port): 10392 case bpf_ctx_range(struct bpf_sk_lookup, local_port): 10393 bpf_ctx_record_field_size(info, sizeof(__u32)); 10394 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); 10395 10396 default: 10397 return false; 10398 } 10399 } 10400 10401 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, 10402 const struct bpf_insn *si, 10403 struct bpf_insn *insn_buf, 10404 struct bpf_prog *prog, 10405 u32 *target_size) 10406 { 10407 struct bpf_insn *insn = insn_buf; 10408 10409 switch (si->off) { 10410 case offsetof(struct bpf_sk_lookup, sk): 10411 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 10412 offsetof(struct bpf_sk_lookup_kern, selected_sk)); 10413 break; 10414 10415 case offsetof(struct bpf_sk_lookup, family): 10416 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 10417 bpf_target_off(struct bpf_sk_lookup_kern, 10418 family, 2, target_size)); 10419 break; 10420 10421 case offsetof(struct bpf_sk_lookup, protocol): 10422 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 10423 bpf_target_off(struct bpf_sk_lookup_kern, 10424 protocol, 2, target_size)); 10425 break; 10426 10427 case offsetof(struct bpf_sk_lookup, remote_ip4): 10428 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10429 bpf_target_off(struct bpf_sk_lookup_kern, 10430 v4.saddr, 4, target_size)); 10431 break; 10432 10433 case offsetof(struct bpf_sk_lookup, local_ip4): 10434 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10435 bpf_target_off(struct bpf_sk_lookup_kern, 10436 v4.daddr, 4, target_size)); 10437 break; 10438 10439 case bpf_ctx_range_till(struct bpf_sk_lookup, 10440 remote_ip6[0], remote_ip6[3]): { 10441 #if IS_ENABLED(CONFIG_IPV6) 10442 int off = si->off; 10443 10444 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); 10445 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 10446 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 10447 offsetof(struct bpf_sk_lookup_kern, v6.saddr)); 10448 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10449 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 10450 #else 10451 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10452 #endif 10453 break; 10454 } 10455 case bpf_ctx_range_till(struct bpf_sk_lookup, 10456 local_ip6[0], local_ip6[3]): { 10457 #if IS_ENABLED(CONFIG_IPV6) 10458 int off = si->off; 10459 10460 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); 10461 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 10462 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 10463 offsetof(struct bpf_sk_lookup_kern, v6.daddr)); 10464 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10465 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 10466 #else 10467 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10468 #endif 10469 break; 10470 } 10471 case offsetof(struct bpf_sk_lookup, remote_port): 10472 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 10473 bpf_target_off(struct bpf_sk_lookup_kern, 10474 sport, 2, target_size)); 10475 break; 10476 10477 case offsetof(struct bpf_sk_lookup, local_port): 10478 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 10479 bpf_target_off(struct bpf_sk_lookup_kern, 10480 dport, 2, target_size)); 10481 break; 10482 } 10483 10484 return insn - insn_buf; 10485 } 10486 10487 const struct bpf_prog_ops sk_lookup_prog_ops = { 10488 .test_run = bpf_prog_test_run_sk_lookup, 10489 }; 10490 10491 const struct bpf_verifier_ops sk_lookup_verifier_ops = { 10492 .get_func_proto = sk_lookup_func_proto, 10493 .is_valid_access = sk_lookup_is_valid_access, 10494 .convert_ctx_access = sk_lookup_convert_ctx_access, 10495 }; 10496 10497 #endif /* CONFIG_INET */ 10498 10499 DEFINE_BPF_DISPATCHER(xdp) 10500 10501 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 10502 { 10503 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); 10504 } 10505 10506 #ifdef CONFIG_DEBUG_INFO_BTF 10507 BTF_ID_LIST_GLOBAL(btf_sock_ids) 10508 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) 10509 BTF_SOCK_TYPE_xxx 10510 #undef BTF_SOCK_TYPE 10511 #else 10512 u32 btf_sock_ids[MAX_BTF_SOCK_TYPE]; 10513 #endif 10514 10515 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) 10516 { 10517 /* tcp6_sock type is not generated in dwarf and hence btf, 10518 * trigger an explicit type generation here. 10519 */ 10520 BTF_TYPE_EMIT(struct tcp6_sock); 10521 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && 10522 sk->sk_family == AF_INET6) 10523 return (unsigned long)sk; 10524 10525 return (unsigned long)NULL; 10526 } 10527 10528 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { 10529 .func = bpf_skc_to_tcp6_sock, 10530 .gpl_only = false, 10531 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10532 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 10533 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], 10534 }; 10535 10536 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) 10537 { 10538 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 10539 return (unsigned long)sk; 10540 10541 return (unsigned long)NULL; 10542 } 10543 10544 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { 10545 .func = bpf_skc_to_tcp_sock, 10546 .gpl_only = false, 10547 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10548 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 10549 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], 10550 }; 10551 10552 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) 10553 { 10554 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not 10555 * generated if CONFIG_INET=n. Trigger an explicit generation here. 10556 */ 10557 BTF_TYPE_EMIT(struct inet_timewait_sock); 10558 BTF_TYPE_EMIT(struct tcp_timewait_sock); 10559 10560 #ifdef CONFIG_INET 10561 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) 10562 return (unsigned long)sk; 10563 #endif 10564 10565 #if IS_BUILTIN(CONFIG_IPV6) 10566 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) 10567 return (unsigned long)sk; 10568 #endif 10569 10570 return (unsigned long)NULL; 10571 } 10572 10573 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { 10574 .func = bpf_skc_to_tcp_timewait_sock, 10575 .gpl_only = false, 10576 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10577 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 10578 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], 10579 }; 10580 10581 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) 10582 { 10583 #ifdef CONFIG_INET 10584 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) 10585 return (unsigned long)sk; 10586 #endif 10587 10588 #if IS_BUILTIN(CONFIG_IPV6) 10589 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) 10590 return (unsigned long)sk; 10591 #endif 10592 10593 return (unsigned long)NULL; 10594 } 10595 10596 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { 10597 .func = bpf_skc_to_tcp_request_sock, 10598 .gpl_only = false, 10599 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10600 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 10601 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], 10602 }; 10603 10604 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) 10605 { 10606 /* udp6_sock type is not generated in dwarf and hence btf, 10607 * trigger an explicit type generation here. 10608 */ 10609 BTF_TYPE_EMIT(struct udp6_sock); 10610 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && 10611 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) 10612 return (unsigned long)sk; 10613 10614 return (unsigned long)NULL; 10615 } 10616 10617 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { 10618 .func = bpf_skc_to_udp6_sock, 10619 .gpl_only = false, 10620 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10621 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 10622 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], 10623 }; 10624 10625 BPF_CALL_1(bpf_sock_from_file, struct file *, file) 10626 { 10627 return (unsigned long)sock_from_file(file); 10628 } 10629 10630 BTF_ID_LIST(bpf_sock_from_file_btf_ids) 10631 BTF_ID(struct, socket) 10632 BTF_ID(struct, file) 10633 10634 const struct bpf_func_proto bpf_sock_from_file_proto = { 10635 .func = bpf_sock_from_file, 10636 .gpl_only = false, 10637 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 10638 .ret_btf_id = &bpf_sock_from_file_btf_ids[0], 10639 .arg1_type = ARG_PTR_TO_BTF_ID, 10640 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1], 10641 }; 10642 10643 static const struct bpf_func_proto * 10644 bpf_sk_base_func_proto(enum bpf_func_id func_id) 10645 { 10646 const struct bpf_func_proto *func; 10647 10648 switch (func_id) { 10649 case BPF_FUNC_skc_to_tcp6_sock: 10650 func = &bpf_skc_to_tcp6_sock_proto; 10651 break; 10652 case BPF_FUNC_skc_to_tcp_sock: 10653 func = &bpf_skc_to_tcp_sock_proto; 10654 break; 10655 case BPF_FUNC_skc_to_tcp_timewait_sock: 10656 func = &bpf_skc_to_tcp_timewait_sock_proto; 10657 break; 10658 case BPF_FUNC_skc_to_tcp_request_sock: 10659 func = &bpf_skc_to_tcp_request_sock_proto; 10660 break; 10661 case BPF_FUNC_skc_to_udp6_sock: 10662 func = &bpf_skc_to_udp6_sock_proto; 10663 break; 10664 default: 10665 return bpf_base_func_proto(func_id); 10666 } 10667 10668 if (!perfmon_capable()) 10669 return NULL; 10670 10671 return func; 10672 } 10673