1 /* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */ 2 /*- 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr) and 5 * Niels Provos (provos@physnet.uni-hamburg.de). 6 * 7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 8 * in November 1995. 9 * 10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 11 * by Angelos D. Keromytis. 12 * 13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 14 * and Niels Provos. 15 * 16 * Additional features in 1999 by Angelos D. Keromytis. 17 * 18 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 19 * Angelos D. Keromytis and Niels Provos. 20 * Copyright (c) 2001, Angelos D. Keromytis. 21 * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> 22 * 23 * Permission to use, copy, and modify this software with or without fee 24 * is hereby granted, provided that this entire notice is included in 25 * all copies of any software which is or includes a copy or 26 * modification of this software. 27 * You may use this code under the GNU public license if you so wish. Please 28 * contribute changes back to the authors under this freer than GPL license 29 * so that we may further the use of strong encryption without limitations to 30 * all. 31 * 32 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 33 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 34 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 35 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 36 * PURPOSE. 37 */ 38 39 /* 40 * IPsec input processing. 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include "opt_inet.h" 47 #include "opt_inet6.h" 48 #include "opt_ipsec.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/domain.h> 55 #include <sys/protosw.h> 56 #include <sys/socket.h> 57 #include <sys/errno.h> 58 #include <sys/hhook.h> 59 #include <sys/syslog.h> 60 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/if_enc.h> 64 #include <net/netisr.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/ip_icmp.h> 72 #include <netinet/in_var.h> 73 #include <netinet/tcp_var.h> 74 75 #include <netinet/ip6.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #endif 79 #include <netinet/in_pcb.h> 80 #ifdef INET6 81 #include <netinet/icmp6.h> 82 #endif 83 84 #include <netipsec/ipsec.h> 85 #ifdef INET6 86 #include <netipsec/ipsec6.h> 87 #endif 88 #include <netipsec/ah_var.h> 89 #include <netipsec/esp.h> 90 #include <netipsec/esp_var.h> 91 #include <netipsec/ipcomp_var.h> 92 93 #include <netipsec/key.h> 94 #include <netipsec/keydb.h> 95 #include <netipsec/key_debug.h> 96 97 #include <netipsec/xform.h> 98 #include <netinet6/ip6protosw.h> 99 100 #include <machine/in_cksum.h> 101 #include <machine/stdarg.h> 102 103 #define IPSEC_ISTAT(proto, name) do { \ 104 if ((proto) == IPPROTO_ESP) \ 105 ESPSTAT_INC(esps_##name); \ 106 else if ((proto) == IPPROTO_AH) \ 107 AHSTAT_INC(ahs_##name); \ 108 else \ 109 IPCOMPSTAT_INC(ipcomps_##name); \ 110 } while (0) 111 112 /* 113 * ipsec_common_input gets called when an IPsec-protected packet 114 * is received by IPv4 or IPv6. Its job is to find the right SA 115 * and call the appropriate transform. The transform callback 116 * takes care of further processing (like ingress filtering). 117 */ 118 static int 119 ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto) 120 { 121 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 122 union sockaddr_union dst_address; 123 struct secasvar *sav; 124 uint32_t spi; 125 int error; 126 127 IPSEC_ISTAT(sproto, input); 128 129 IPSEC_ASSERT(m != NULL, ("null packet")); 130 131 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 132 sproto == IPPROTO_IPCOMP, 133 ("unexpected security protocol %u", sproto)); 134 135 if ((sproto == IPPROTO_ESP && !V_esp_enable) || 136 (sproto == IPPROTO_AH && !V_ah_enable) || 137 (sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 138 m_freem(m); 139 IPSEC_ISTAT(sproto, pdrops); 140 return EOPNOTSUPP; 141 } 142 143 if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) { 144 m_freem(m); 145 IPSEC_ISTAT(sproto, hdrops); 146 DPRINTF(("%s: packet too small\n", __func__)); 147 return EINVAL; 148 } 149 150 /* Retrieve the SPI from the relevant IPsec header */ 151 if (sproto == IPPROTO_ESP) 152 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi); 153 else if (sproto == IPPROTO_AH) 154 m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t), 155 (caddr_t) &spi); 156 else if (sproto == IPPROTO_IPCOMP) { 157 u_int16_t cpi; 158 m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t), 159 (caddr_t) &cpi); 160 spi = ntohl(htons(cpi)); 161 } 162 163 /* 164 * Find the SA and (indirectly) call the appropriate 165 * kernel crypto routine. The resulting mbuf chain is a valid 166 * IP packet ready to go through input processing. 167 */ 168 bzero(&dst_address, sizeof (dst_address)); 169 dst_address.sa.sa_family = af; 170 switch (af) { 171 #ifdef INET 172 case AF_INET: 173 dst_address.sin.sin_len = sizeof(struct sockaddr_in); 174 m_copydata(m, offsetof(struct ip, ip_dst), 175 sizeof(struct in_addr), 176 (caddr_t) &dst_address.sin.sin_addr); 177 break; 178 #endif /* INET */ 179 #ifdef INET6 180 case AF_INET6: 181 dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6); 182 m_copydata(m, offsetof(struct ip6_hdr, ip6_dst), 183 sizeof(struct in6_addr), 184 (caddr_t) &dst_address.sin6.sin6_addr); 185 /* We keep addresses in SADB without embedded scope id */ 186 if (IN6_IS_SCOPE_LINKLOCAL(&dst_address.sin6.sin6_addr)) { 187 /* XXX: sa6_recoverscope() */ 188 dst_address.sin6.sin6_scope_id = 189 ntohs(dst_address.sin6.sin6_addr.s6_addr16[1]); 190 dst_address.sin6.sin6_addr.s6_addr16[1] = 0; 191 } 192 break; 193 #endif /* INET6 */ 194 default: 195 DPRINTF(("%s: unsupported protocol family %u\n", __func__, af)); 196 m_freem(m); 197 IPSEC_ISTAT(sproto, nopf); 198 return EPFNOSUPPORT; 199 } 200 201 /* NB: only pass dst since key_allocsa follows RFC2401 */ 202 sav = key_allocsa(&dst_address, sproto, spi); 203 if (sav == NULL) { 204 DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n", 205 __func__, ipsec_address(&dst_address, buf, sizeof(buf)), 206 (u_long) ntohl(spi), sproto)); 207 IPSEC_ISTAT(sproto, notdb); 208 m_freem(m); 209 return ENOENT; 210 } 211 212 if (sav->tdb_xform == NULL) { 213 DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n", 214 __func__, ipsec_address(&dst_address, buf, sizeof(buf)), 215 (u_long) ntohl(spi), sproto)); 216 IPSEC_ISTAT(sproto, noxform); 217 key_freesav(&sav); 218 m_freem(m); 219 return ENXIO; 220 } 221 222 /* 223 * Call appropriate transform and return -- callback takes care of 224 * everything else. 225 */ 226 error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff); 227 return (error); 228 } 229 230 #ifdef INET 231 extern struct protosw inetsw[]; 232 233 /* 234 * IPSEC_INPUT() method implementation for IPv4. 235 * 0 - Permitted by inbound security policy for further processing. 236 * EACCES - Forbidden by inbound security policy. 237 * EINPROGRESS - consumed by IPsec. 238 */ 239 int 240 ipsec4_input(struct mbuf *m, int offset, int proto) 241 { 242 243 switch (proto) { 244 case IPPROTO_AH: 245 case IPPROTO_ESP: 246 case IPPROTO_IPCOMP: 247 /* Do inbound IPsec processing for AH/ESP/IPCOMP */ 248 ipsec_common_input(m, offset, 249 offsetof(struct ip, ip_p), AF_INET, proto); 250 return (EINPROGRESS); /* mbuf consumed by IPsec */ 251 default: 252 /* 253 * Protocols with further headers get their IPsec treatment 254 * within the protocol specific processing. 255 */ 256 if ((inetsw[ip_protox[proto]].pr_flags & PR_LASTHDR) == 0) 257 return (0); 258 /* FALLTHROUGH */ 259 }; 260 /* 261 * Enforce IPsec policy checking if we are seeing last header. 262 */ 263 if (ipsec4_in_reject(m, NULL) != 0) { 264 /* Forbidden by inbound security policy */ 265 m_freem(m); 266 return (EACCES); 267 } 268 return (0); 269 } 270 271 int 272 ipsec4_ctlinput(int code, struct sockaddr *sa, void *v) 273 { 274 struct in_conninfo inc; 275 struct secasvar *sav; 276 struct icmp *icp; 277 struct ip *ip = v; 278 uint32_t pmtu, spi; 279 uint8_t proto; 280 281 if (code != PRC_MSGSIZE || ip == NULL) 282 return (EINVAL); 283 if (sa->sa_family != AF_INET || 284 sa->sa_len != sizeof(struct sockaddr_in)) 285 return (EAFNOSUPPORT); 286 287 icp = __containerof(ip, struct icmp, icmp_ip); 288 pmtu = ntohs(icp->icmp_nextmtu); 289 290 if (pmtu < V_ip4_ipsec_min_pmtu) 291 return (EINVAL); 292 293 proto = ip->ip_p; 294 if (proto != IPPROTO_ESP && proto != IPPROTO_AH && 295 proto != IPPROTO_IPCOMP) 296 return (EINVAL); 297 298 memcpy(&spi, (caddr_t)ip + (ip->ip_hl << 2), sizeof(spi)); 299 sav = key_allocsa((union sockaddr_union *)sa, proto, spi); 300 if (sav == NULL) 301 return (ENOENT); 302 303 key_freesav(&sav); 304 305 memset(&inc, 0, sizeof(inc)); 306 inc.inc_faddr = satosin(sa)->sin_addr; 307 tcp_hc_updatemtu(&inc, pmtu); 308 return (0); 309 } 310 311 /* 312 * IPsec input callback for INET protocols. 313 * This routine is called as the transform callback. 314 * Takes care of filtering and other sanity checks on 315 * the processed packet. 316 */ 317 int 318 ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, 319 int protoff) 320 { 321 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 322 struct epoch_tracker et; 323 struct ipsec_ctx_data ctx; 324 struct xform_history *xh; 325 struct secasindex *saidx; 326 struct m_tag *mtag; 327 struct ip *ip; 328 int error, prot, af, sproto, isr_prot; 329 330 IPSEC_ASSERT(sav != NULL, ("null SA")); 331 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 332 saidx = &sav->sah->saidx; 333 af = saidx->dst.sa.sa_family; 334 IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af)); 335 sproto = saidx->proto; 336 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 337 sproto == IPPROTO_IPCOMP, 338 ("unexpected security protocol %u", sproto)); 339 340 if (skip != 0) { 341 /* 342 * Fix IPv4 header 343 */ 344 if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) { 345 DPRINTF(("%s: processing failed for SA %s/%08lx\n", 346 __func__, ipsec_address(&sav->sah->saidx.dst, 347 buf, sizeof(buf)), (u_long) ntohl(sav->spi))); 348 IPSEC_ISTAT(sproto, hdrops); 349 error = ENOBUFS; 350 goto bad_noepoch; 351 } 352 353 ip = mtod(m, struct ip *); 354 ip->ip_len = htons(m->m_pkthdr.len); 355 ip->ip_sum = 0; 356 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 357 } else { 358 ip = mtod(m, struct ip *); 359 } 360 prot = ip->ip_p; 361 /* 362 * Check that we have NAT-T enabled and apply transport mode 363 * decapsulation NAT procedure (RFC3948). 364 * Do this before invoking into the PFIL. 365 */ 366 if (sav->natt != NULL && 367 (prot == IPPROTO_UDP || prot == IPPROTO_TCP)) 368 udp_ipsec_adjust_cksum(m, sav, prot, skip); 369 370 /* 371 * Needed for ipsec_run_hooks and netisr_queue_src 372 */ 373 NET_EPOCH_ENTER(et); 374 375 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, AF_INET, IPSEC_ENC_BEFORE); 376 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 377 goto bad; 378 ip = mtod(m, struct ip *); /* update pointer */ 379 380 /* IP-in-IP encapsulation */ 381 if (prot == IPPROTO_IPIP && 382 saidx->mode != IPSEC_MODE_TRANSPORT) { 383 if (m->m_pkthdr.len - skip < sizeof(struct ip)) { 384 IPSEC_ISTAT(sproto, hdrops); 385 error = EINVAL; 386 goto bad; 387 } 388 /* enc0: strip outer IPv4 header */ 389 m_striphdr(m, 0, ip->ip_hl << 2); 390 } 391 #ifdef INET6 392 /* IPv6-in-IP encapsulation. */ 393 else if (prot == IPPROTO_IPV6 && 394 saidx->mode != IPSEC_MODE_TRANSPORT) { 395 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) { 396 IPSEC_ISTAT(sproto, hdrops); 397 error = EINVAL; 398 goto bad; 399 } 400 /* enc0: strip IPv4 header, keep IPv6 header only */ 401 m_striphdr(m, 0, ip->ip_hl << 2); 402 } 403 #endif /* INET6 */ 404 else if (prot != IPPROTO_IPV6 && saidx->mode == IPSEC_MODE_ANY) { 405 /* 406 * When mode is wildcard, inner protocol is IPv6 and 407 * we have no INET6 support - drop this packet a bit later. 408 * In other cases we assume transport mode. Set prot to 409 * correctly choose netisr. 410 */ 411 prot = IPPROTO_IPIP; 412 } 413 414 /* 415 * Record what we've done to the packet (under what SA it was 416 * processed). 417 */ 418 if (sproto != IPPROTO_IPCOMP) { 419 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE, 420 sizeof(struct xform_history), M_NOWAIT); 421 if (mtag == NULL) { 422 DPRINTF(("%s: failed to get tag\n", __func__)); 423 IPSEC_ISTAT(sproto, hdrops); 424 error = ENOMEM; 425 goto bad; 426 } 427 428 xh = (struct xform_history *)(mtag + 1); 429 bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len); 430 xh->spi = sav->spi; 431 xh->proto = sproto; 432 xh->mode = saidx->mode; 433 m_tag_prepend(m, mtag); 434 } 435 436 key_sa_recordxfer(sav, m); /* record data transfer */ 437 438 /* 439 * In transport mode requeue decrypted mbuf back to IPv4 protocol 440 * handler. This is necessary to correctly expose rcvif. 441 */ 442 if (saidx->mode == IPSEC_MODE_TRANSPORT) 443 prot = IPPROTO_IPIP; 444 /* 445 * Re-dispatch via software interrupt. 446 */ 447 switch (prot) { 448 case IPPROTO_IPIP: 449 isr_prot = NETISR_IP; 450 af = AF_INET; 451 break; 452 #ifdef INET6 453 case IPPROTO_IPV6: 454 isr_prot = NETISR_IPV6; 455 af = AF_INET6; 456 break; 457 #endif 458 default: 459 DPRINTF(("%s: cannot handle inner ip proto %d\n", 460 __func__, prot)); 461 IPSEC_ISTAT(sproto, nopf); 462 error = EPFNOSUPPORT; 463 goto bad; 464 } 465 466 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER); 467 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 468 goto bad; 469 470 /* Handle virtual tunneling interfaces */ 471 if (saidx->mode == IPSEC_MODE_TUNNEL) 472 error = ipsec_if_input(m, sav, af); 473 if (error == 0) { 474 error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m); 475 if (error) { 476 IPSEC_ISTAT(sproto, qfull); 477 DPRINTF(("%s: queue full; proto %u packet dropped\n", 478 __func__, sproto)); 479 } 480 } 481 NET_EPOCH_EXIT(et); 482 key_freesav(&sav); 483 return (error); 484 bad: 485 NET_EPOCH_EXIT(et); 486 bad_noepoch: 487 key_freesav(&sav); 488 if (m != NULL) 489 m_freem(m); 490 return (error); 491 } 492 #endif /* INET */ 493 494 #ifdef INET6 495 /* 496 * IPSEC_INPUT() method implementation for IPv6. 497 * 0 - Permitted by inbound security policy for further processing. 498 * EACCES - Forbidden by inbound security policy. 499 * EINPROGRESS - consumed by IPsec. 500 */ 501 int 502 ipsec6_input(struct mbuf *m, int offset, int proto) 503 { 504 505 switch (proto) { 506 case IPPROTO_AH: 507 case IPPROTO_ESP: 508 case IPPROTO_IPCOMP: 509 /* Do inbound IPsec processing for AH/ESP/IPCOMP */ 510 ipsec_common_input(m, offset, 511 offsetof(struct ip6_hdr, ip6_nxt), AF_INET6, proto); 512 return (EINPROGRESS); /* mbuf consumed by IPsec */ 513 default: 514 /* 515 * Protocols with further headers get their IPsec treatment 516 * within the protocol specific processing. 517 */ 518 if ((inet6sw[ip6_protox[proto]].pr_flags & PR_LASTHDR) == 0) 519 return (0); 520 /* FALLTHROUGH */ 521 }; 522 /* 523 * Enforce IPsec policy checking if we are seeing last header. 524 */ 525 if (ipsec6_in_reject(m, NULL) != 0) { 526 /* Forbidden by inbound security policy */ 527 m_freem(m); 528 return (EACCES); 529 } 530 return (0); 531 } 532 533 int 534 ipsec6_ctlinput(int code, struct sockaddr *sa, void *v) 535 { 536 return (0); 537 } 538 539 /* 540 * IPsec input callback, called by the transform callback. Takes care of 541 * filtering and other sanity checks on the processed packet. 542 */ 543 int 544 ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, 545 int protoff) 546 { 547 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 548 struct epoch_tracker et; 549 struct ipsec_ctx_data ctx; 550 struct xform_history *xh; 551 struct secasindex *saidx; 552 struct ip6_hdr *ip6; 553 struct m_tag *mtag; 554 int prot, af, sproto; 555 int nxt, isr_prot; 556 int error, nest; 557 uint8_t nxt8; 558 559 IPSEC_ASSERT(sav != NULL, ("null SA")); 560 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 561 saidx = &sav->sah->saidx; 562 af = saidx->dst.sa.sa_family; 563 IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af)); 564 sproto = saidx->proto; 565 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 566 sproto == IPPROTO_IPCOMP, 567 ("unexpected security protocol %u", sproto)); 568 569 NET_EPOCH_ENTER(et); 570 571 /* Fix IPv6 header */ 572 if (m->m_len < sizeof(struct ip6_hdr) && 573 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 574 DPRINTF(("%s: processing failed for SA %s/%08lx\n", 575 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 576 sizeof(buf)), (u_long) ntohl(sav->spi))); 577 578 IPSEC_ISTAT(sproto, hdrops); 579 error = EACCES; 580 goto bad; 581 } 582 583 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_BEFORE); 584 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 585 goto bad; 586 587 ip6 = mtod(m, struct ip6_hdr *); 588 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 589 590 /* Save protocol */ 591 m_copydata(m, protoff, 1, &nxt8); 592 prot = nxt8; 593 594 /* IPv6-in-IP encapsulation */ 595 if (prot == IPPROTO_IPV6 && 596 saidx->mode != IPSEC_MODE_TRANSPORT) { 597 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) { 598 IPSEC_ISTAT(sproto, hdrops); 599 error = EINVAL; 600 goto bad; 601 } 602 /* ip6n will now contain the inner IPv6 header. */ 603 m_striphdr(m, 0, skip); 604 skip = 0; 605 } 606 #ifdef INET 607 /* IP-in-IP encapsulation */ 608 else if (prot == IPPROTO_IPIP && 609 saidx->mode != IPSEC_MODE_TRANSPORT) { 610 if (m->m_pkthdr.len - skip < sizeof(struct ip)) { 611 IPSEC_ISTAT(sproto, hdrops); 612 error = EINVAL; 613 goto bad; 614 } 615 /* ipn will now contain the inner IPv4 header */ 616 m_striphdr(m, 0, skip); 617 skip = 0; 618 } 619 #endif /* INET */ 620 else { 621 prot = IPPROTO_IPV6; /* for correct BPF processing */ 622 } 623 624 /* 625 * Record what we've done to the packet (under what SA it was 626 * processed). 627 */ 628 if (sproto != IPPROTO_IPCOMP) { 629 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE, 630 sizeof(struct xform_history), M_NOWAIT); 631 if (mtag == NULL) { 632 DPRINTF(("%s: failed to get tag\n", __func__)); 633 IPSEC_ISTAT(sproto, hdrops); 634 error = ENOMEM; 635 goto bad; 636 } 637 638 xh = (struct xform_history *)(mtag + 1); 639 bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len); 640 xh->spi = sav->spi; 641 xh->proto = sproto; 642 xh->mode = saidx->mode; 643 m_tag_prepend(m, mtag); 644 } 645 646 key_sa_recordxfer(sav, m); 647 648 #ifdef INET 649 if (prot == IPPROTO_IPIP) 650 af = AF_INET; 651 else 652 #endif 653 af = AF_INET6; 654 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER); 655 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 656 goto bad; 657 if (skip == 0) { 658 /* 659 * We stripped outer IPv6 header. 660 * Now we should requeue decrypted packet via netisr. 661 */ 662 switch (prot) { 663 #ifdef INET 664 case IPPROTO_IPIP: 665 isr_prot = NETISR_IP; 666 break; 667 #endif 668 case IPPROTO_IPV6: 669 isr_prot = NETISR_IPV6; 670 break; 671 default: 672 DPRINTF(("%s: cannot handle inner ip proto %d\n", 673 __func__, prot)); 674 IPSEC_ISTAT(sproto, nopf); 675 error = EPFNOSUPPORT; 676 goto bad; 677 } 678 /* Handle virtual tunneling interfaces */ 679 if (saidx->mode == IPSEC_MODE_TUNNEL) 680 error = ipsec_if_input(m, sav, af); 681 if (error == 0) { 682 error = netisr_queue_src(isr_prot, 683 (uintptr_t)sav->spi, m); 684 if (error) { 685 IPSEC_ISTAT(sproto, qfull); 686 DPRINTF(("%s: queue full; proto %u packet" 687 " dropped\n", __func__, sproto)); 688 } 689 } 690 NET_EPOCH_EXIT(et); 691 key_freesav(&sav); 692 return (error); 693 } 694 /* 695 * See the end of ip6_input for this logic. 696 * IPPROTO_IPV[46] case will be processed just like other ones 697 */ 698 nest = 0; 699 nxt = nxt8; 700 while (nxt != IPPROTO_DONE) { 701 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 702 IP6STAT_INC(ip6s_toomanyhdr); 703 error = EINVAL; 704 goto bad; 705 } 706 707 /* 708 * Protection against faulty packet - there should be 709 * more sanity checks in header chain processing. 710 */ 711 if (m->m_pkthdr.len < skip) { 712 IP6STAT_INC(ip6s_tooshort); 713 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 714 error = EINVAL; 715 goto bad; 716 } 717 /* 718 * Enforce IPsec policy checking if we are seeing last header. 719 * note that we do not visit this with protocols with pcb layer 720 * code - like udp/tcp/raw ip. 721 */ 722 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 723 ipsec6_in_reject(m, NULL)) { 724 error = EINVAL; 725 goto bad; 726 } 727 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt); 728 } 729 NET_EPOCH_EXIT(et); 730 key_freesav(&sav); 731 return (0); 732 bad: 733 NET_EPOCH_EXIT(et); 734 key_freesav(&sav); 735 if (m) 736 m_freem(m); 737 return (error); 738 } 739 #endif /* INET6 */ 740