ipsec_output.c revision 1.52
1 /* $NetBSD: ipsec_output.c,v 1.52 2017/07/13 01:22:44 ozaki-r Exp $ */ 2 3 /*- 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: /repoman/r/ncvs/src/sys/netipsec/ipsec_output.c,v 1.3.2.2 2003/03/28 20:32:53 sam Exp $ 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.52 2017/07/13 01:22:44 ozaki-r Exp $"); 33 34 /* 35 * IPsec output processing. 36 */ 37 #if defined(_KERNEL_OPT) 38 #include "opt_inet.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/errno.h> 48 #include <sys/syslog.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/ip_var.h> 57 #include <netinet/in_var.h> 58 #include <netinet/ip_ecn.h> 59 60 #include <netinet/ip6.h> 61 #ifdef INET6 62 #include <netinet6/ip6_var.h> 63 #endif 64 #include <netinet/in_pcb.h> 65 #ifdef INET6 66 #include <netinet/icmp6.h> 67 #endif 68 #include <netinet/udp.h> 69 70 #include <netipsec/ipsec.h> 71 #include <netipsec/ipsec_var.h> 72 #include <netipsec/ipsec_private.h> 73 #ifdef INET6 74 #include <netipsec/ipsec6.h> 75 #endif 76 #include <netipsec/ah_var.h> 77 #include <netipsec/esp_var.h> 78 #include <netipsec/ipcomp_var.h> 79 80 #include <netipsec/xform.h> 81 82 #include <netipsec/key.h> 83 #include <netipsec/keydb.h> 84 #include <netipsec/key_debug.h> 85 86 #include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */ 87 88 89 /* 90 * Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing 91 * It will be used by ip{,6}_output to check if we have already or not 92 * processed this packet. 93 */ 94 static int 95 ipsec_register_done(struct mbuf *m, int * error) 96 { 97 struct m_tag *mtag; 98 99 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT); 100 if (mtag == NULL) { 101 IPSECLOG(LOG_DEBUG, "could not get packet tag\n"); 102 *error = ENOMEM; 103 return -1; 104 } 105 106 m_tag_prepend(m, mtag); 107 return 0; 108 } 109 110 static int 111 ipsec_reinject_ipstack(struct mbuf *m, int af) 112 { 113 #if defined(INET) || defined(INET6) 114 int rv; 115 #endif 116 117 switch (af) { 118 #ifdef INET 119 case AF_INET: 120 KERNEL_LOCK(1, NULL); 121 rv = ip_output(m, NULL, NULL, IP_RAWOUTPUT|IP_NOIPNEWID, 122 NULL, NULL); 123 KERNEL_UNLOCK_ONE(NULL); 124 return rv; 125 126 #endif /* INET */ 127 #ifdef INET6 128 case AF_INET6: 129 /* 130 * We don't need massage, IPv6 header fields are always in 131 * net endian. 132 */ 133 KERNEL_LOCK(1, NULL); 134 rv = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 135 KERNEL_UNLOCK_ONE(NULL); 136 return rv; 137 #endif /* INET6 */ 138 } 139 140 panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af); 141 return -1; /* NOTREACHED */ 142 } 143 144 int 145 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 146 { 147 struct secasvar *sav; 148 struct secasindex *saidx; 149 int error; 150 #ifdef INET 151 struct ip * ip; 152 #endif /* INET */ 153 #ifdef INET6 154 struct ip6_hdr * ip6; 155 #endif /* INET6 */ 156 struct mbuf * mo; 157 struct udphdr *udp = NULL; 158 uint64_t * data = NULL; 159 int hlen, roff; 160 161 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 162 163 KASSERT(m != NULL); 164 KASSERT(isr != NULL); 165 sav = isr->sav; 166 KASSERT(sav != NULL); 167 168 saidx = &sav->sah->saidx; 169 170 if(sav->natt_type != 0) { 171 ip = mtod(m, struct ip *); 172 173 hlen = sizeof(struct udphdr); 174 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 175 hlen += sizeof(uint64_t); 176 177 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 178 if (mo == NULL) { 179 char buf[IPSEC_ADDRSTRLEN]; 180 IPSECLOG(LOG_DEBUG, 181 "failed to inject %u byte UDP for SA %s/%08lx\n", 182 hlen, ipsec_address(&saidx->dst, buf, sizeof(buf)), 183 (u_long) ntohl(sav->spi)); 184 error = ENOBUFS; 185 goto bad; 186 } 187 188 udp = (struct udphdr*) (mtod(mo, char*) + roff); 189 data = (uint64_t*) (udp + 1); 190 191 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 192 *data = 0; /* NON-IKE Marker */ 193 194 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 195 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 196 else 197 udp->uh_sport = key_portfromsaddr(&saidx->src); 198 199 udp->uh_dport = key_portfromsaddr(&saidx->dst); 200 udp->uh_sum = 0; 201 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 202 } 203 204 switch (saidx->dst.sa.sa_family) { 205 #ifdef INET 206 case AF_INET: 207 /* Fix the header length, for AH processing. */ 208 ip = mtod(m, struct ip *); 209 ip->ip_len = htons(m->m_pkthdr.len); 210 if (sav->natt_type != 0) 211 ip->ip_p = IPPROTO_UDP; 212 break; 213 #endif /* INET */ 214 #ifdef INET6 215 case AF_INET6: 216 /* Fix the header length, for AH processing. */ 217 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 218 error = ENXIO; 219 goto bad; 220 } 221 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 222 /* No jumbogram support. */ 223 error = ENXIO; /*?*/ 224 goto bad; 225 } 226 ip6 = mtod(m, struct ip6_hdr *); 227 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 228 if (sav->natt_type != 0) 229 ip6->ip6_nxt = IPPROTO_UDP; 230 break; 231 #endif /* INET6 */ 232 default: 233 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 234 saidx->dst.sa.sa_family); 235 error = ENXIO; 236 goto bad; 237 } 238 239 key_sa_recordxfer(sav, m); 240 241 /* 242 * If there's another (bundled) SA to apply, do so. 243 * Note that this puts a burden on the kernel stack size. 244 * If this is a problem we'll need to introduce a queue 245 * to set the packet on so we can unwind the stack before 246 * doing further processing. 247 */ 248 if (isr->next) { 249 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 250 switch ( saidx->dst.sa.sa_family ) { 251 #ifdef INET 252 case AF_INET: 253 return ipsec4_process_packet(m, isr->next); 254 #endif /* INET */ 255 #ifdef INET6 256 case AF_INET6: 257 return ipsec6_process_packet(m,isr->next); 258 #endif /* INET6 */ 259 default : 260 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 261 saidx->dst.sa.sa_family); 262 error = ENXIO; 263 goto bad; 264 } 265 } 266 267 /* 268 * We're done with IPsec processing, 269 * mark that we have already processed the packet 270 * transmit it packet using the appropriate network protocol (IP or IPv6). 271 */ 272 273 if (ipsec_register_done(m, &error) < 0) 274 goto bad; 275 276 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 277 bad: 278 m_freem(m); 279 KEY_FREESAV(&sav); 280 return (error); 281 } 282 283 /* 284 * ipsec_nextisr can return : 285 * - isr == NULL and error != 0 => something is bad : the packet must be 286 * discarded 287 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 288 * is done, reinject it in ip stack 289 * - isr != NULL (error == 0) => we need to apply one rule to the packet 290 */ 291 static struct ipsecrequest * 292 ipsec_nextisr( 293 struct mbuf *m, 294 struct ipsecrequest *isr, 295 int af, 296 int *error 297 ) 298 { 299 #define IPSEC_OSTAT(type) \ 300 do { \ 301 switch (isr->saidx.proto) { \ 302 case IPPROTO_ESP: \ 303 ESP_STATINC(ESP_STAT_ ## type); \ 304 break; \ 305 case IPPROTO_AH: \ 306 AH_STATINC(AH_STAT_ ## type); \ 307 break; \ 308 default: \ 309 IPCOMP_STATINC(IPCOMP_STAT_ ## type); \ 310 break; \ 311 } \ 312 } while (/*CONSTCOND*/0) 313 314 struct secasvar *sav; 315 struct secasindex *saidx; 316 317 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 318 KASSERTMSG(af == AF_INET || af == AF_INET6, 319 "invalid address family %u", af); 320 again: 321 /* 322 * Craft SA index to search for proper SA. Note that 323 * we only fillin unspecified SA peers for transport 324 * mode; for tunnel mode they must already be filled in. 325 */ 326 saidx = &isr->saidx; 327 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 328 /* Fillin unspecified SA peers only for transport mode */ 329 if (af == AF_INET) { 330 struct sockaddr_in *sin; 331 struct ip *ip = mtod(m, struct ip *); 332 333 if (saidx->src.sa.sa_len == 0) { 334 sin = &saidx->src.sin; 335 sin->sin_len = sizeof(*sin); 336 sin->sin_family = AF_INET; 337 sin->sin_port = IPSEC_PORT_ANY; 338 sin->sin_addr = ip->ip_src; 339 } 340 if (saidx->dst.sa.sa_len == 0) { 341 sin = &saidx->dst.sin; 342 sin->sin_len = sizeof(*sin); 343 sin->sin_family = AF_INET; 344 sin->sin_port = IPSEC_PORT_ANY; 345 sin->sin_addr = ip->ip_dst; 346 } 347 } else { 348 struct sockaddr_in6 *sin6; 349 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 350 351 if (saidx->src.sin6.sin6_len == 0) { 352 sin6 = (struct sockaddr_in6 *)&saidx->src; 353 sin6->sin6_len = sizeof(*sin6); 354 sin6->sin6_family = AF_INET6; 355 sin6->sin6_port = IPSEC_PORT_ANY; 356 sin6->sin6_addr = ip6->ip6_src; 357 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 358 /* fix scope id for comparing SPD */ 359 sin6->sin6_addr.s6_addr16[1] = 0; 360 sin6->sin6_scope_id = 361 ntohs(ip6->ip6_src.s6_addr16[1]); 362 } 363 } 364 if (saidx->dst.sin6.sin6_len == 0) { 365 sin6 = (struct sockaddr_in6 *)&saidx->dst; 366 sin6->sin6_len = sizeof(*sin6); 367 sin6->sin6_family = AF_INET6; 368 sin6->sin6_port = IPSEC_PORT_ANY; 369 sin6->sin6_addr = ip6->ip6_dst; 370 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 371 /* fix scope id for comparing SPD */ 372 sin6->sin6_addr.s6_addr16[1] = 0; 373 sin6->sin6_scope_id = 374 ntohs(ip6->ip6_dst.s6_addr16[1]); 375 } 376 } 377 } 378 } 379 380 /* 381 * Lookup SA and validate it. 382 */ 383 *error = key_checkrequest(isr); 384 if (*error != 0) { 385 /* 386 * IPsec processing is required, but no SA found. 387 * I assume that key_acquire() had been called 388 * to get/establish the SA. Here I discard 389 * this packet because it is responsibility for 390 * upper layer to retransmit the packet. 391 */ 392 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 393 goto bad; 394 } 395 sav = isr->sav; 396 /* sav may be NULL here if we have an USE rule */ 397 if (sav == NULL) { 398 KASSERTMSG(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 399 "no SA found, but required; level %u", 400 ipsec_get_reqlevel(isr)); 401 isr = isr->next; 402 /* 403 * No more rules to apply, return NULL isr and no error 404 * It can happen when the last rules are USE rules 405 * */ 406 if (isr == NULL) { 407 *error = 0; 408 return isr; 409 } 410 goto again; 411 } 412 413 /* 414 * Check system global policy controls. 415 */ 416 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 417 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 418 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 419 IPSECLOG(LOG_DEBUG, "IPsec outbound packet dropped due" 420 " to policy (check your sysctls)\n"); 421 IPSEC_OSTAT(PDROPS); 422 *error = EHOSTUNREACH; 423 goto bad; 424 } 425 426 /* 427 * Sanity check the SA contents for the caller 428 * before they invoke the xform output method. 429 */ 430 KASSERT(sav->tdb_xform != NULL); 431 return isr; 432 bad: 433 KASSERTMSG(*error != 0, "error return w/ no error code"); 434 return NULL; 435 #undef IPSEC_OSTAT 436 } 437 438 #ifdef INET 439 /* 440 * IPsec output logic for IPv4. 441 */ 442 int 443 ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 444 { 445 struct secasvar *sav; 446 struct ip *ip; 447 int s, error, i, off; 448 union sockaddr_union *dst; 449 int setdf; 450 451 KASSERT(m != NULL); 452 KASSERT(isr != NULL); 453 454 s = splsoftnet(); /* insure SA contents don't change */ 455 456 isr = ipsec_nextisr(m, isr, AF_INET, &error); 457 if (isr == NULL) { 458 if (error != 0) { 459 goto bad; 460 } else { 461 if (ipsec_register_done(m, &error) < 0) 462 goto bad; 463 464 splx(s); 465 return ipsec_reinject_ipstack(m, AF_INET); 466 } 467 } 468 469 sav = isr->sav; 470 dst = &sav->sah->saidx.dst; 471 472 /* 473 * Collect IP_DF state from the outer header. 474 */ 475 if (dst->sa.sa_family == AF_INET) { 476 if (m->m_len < sizeof (struct ip) && 477 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 478 error = ENOBUFS; 479 goto bad; 480 } 481 ip = mtod(m, struct ip *); 482 /* Honor system-wide control of how to handle IP_DF */ 483 switch (ip4_ipsec_dfbit) { 484 case 0: /* clear in outer header */ 485 case 1: /* set in outer header */ 486 setdf = ip4_ipsec_dfbit; 487 break; 488 default: /* propagate to outer header */ 489 setdf = ip->ip_off; 490 setdf = ntohs(setdf); 491 setdf = htons(setdf & IP_DF); 492 break; 493 } 494 } else { 495 ip = NULL; /* keep compiler happy */ 496 setdf = 0; 497 } 498 /* Do the appropriate encapsulation, if necessary */ 499 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 500 dst->sa.sa_family != AF_INET || /* PF mismatch */ 501 #if 0 502 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 503 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 504 #endif 505 (dst->sa.sa_family == AF_INET && /* Proxy */ 506 dst->sin.sin_addr.s_addr != INADDR_ANY && 507 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 508 struct mbuf *mp; 509 510 /* Fix IPv4 header checksum and length */ 511 if (m->m_len < sizeof (struct ip) && 512 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 513 error = ENOBUFS; 514 goto bad; 515 } 516 ip = mtod(m, struct ip *); 517 ip->ip_len = htons(m->m_pkthdr.len); 518 ip->ip_sum = 0; 519 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 520 521 /* Encapsulate the packet */ 522 error = ipip_output(m, isr, &mp, 0, 0); 523 if (mp == NULL && !error) { 524 /* Should never happen. */ 525 IPSECLOG(LOG_DEBUG, 526 "ipip_output returns no mbuf and no error!"); 527 error = EFAULT; 528 } 529 if (error) { 530 if (mp) { 531 /* XXX: Should never happen! */ 532 m_freem(mp); 533 } 534 m = NULL; /* ipip_output() already freed it */ 535 goto bad; 536 } 537 m = mp, mp = NULL; 538 /* 539 * ipip_output clears IP_DF in the new header. If 540 * we need to propagate IP_DF from the outer header, 541 * then we have to do it here. 542 * 543 * XXX shouldn't assume what ipip_output does. 544 */ 545 if (dst->sa.sa_family == AF_INET && setdf) { 546 if (m->m_len < sizeof (struct ip) && 547 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 548 error = ENOBUFS; 549 goto bad; 550 } 551 ip = mtod(m, struct ip *); 552 ip->ip_off |= htons(IP_DF); 553 } 554 } 555 556 /* 557 * Dispatch to the appropriate IPsec transform logic. The 558 * packet will be returned for transmission after crypto 559 * processing, etc. are completed. For encapsulation we 560 * bypass this call because of the explicit call done above 561 * (necessary to deal with IP_DF handling for IPv4). 562 * 563 * NB: m & sav are ``passed to caller'' who's reponsible for 564 * for reclaiming their resources. 565 */ 566 if (sav->tdb_xform->xf_type != XF_IP4) { 567 if (dst->sa.sa_family == AF_INET) { 568 ip = mtod(m, struct ip *); 569 i = ip->ip_hl << 2; 570 off = offsetof(struct ip, ip_p); 571 } else { 572 i = sizeof(struct ip6_hdr); 573 off = offsetof(struct ip6_hdr, ip6_nxt); 574 } 575 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 576 } else { 577 error = ipsec_process_done(m, isr); 578 } 579 splx(s); 580 return error; 581 bad: 582 splx(s); 583 if (m) 584 m_freem(m); 585 return error; 586 } 587 #endif 588 589 #ifdef INET6 590 static void 591 compute_ipsec_pos(struct mbuf *m, int *i, int *off) 592 { 593 int nxt; 594 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr*); 595 struct ip6_ext ip6e; 596 int dstopt = 0; 597 598 *i = sizeof(struct ip6_hdr); 599 *off = offsetof(struct ip6_hdr, ip6_nxt); 600 nxt = ip6->ip6_nxt; 601 602 /* 603 * chase mbuf chain to find the appropriate place to 604 * put AH/ESP/IPcomp header. 605 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 606 */ 607 do { 608 switch (nxt) { 609 case IPPROTO_AH: 610 case IPPROTO_ESP: 611 case IPPROTO_IPCOMP: 612 /* 613 * we should not skip security header added 614 * beforehand. 615 */ 616 return; 617 618 case IPPROTO_HOPOPTS: 619 case IPPROTO_DSTOPTS: 620 case IPPROTO_ROUTING: 621 /* 622 * if we see 2nd destination option header, 623 * we should stop there. 624 */ 625 if (nxt == IPPROTO_DSTOPTS && dstopt) 626 return; 627 628 if (nxt == IPPROTO_DSTOPTS) { 629 /* 630 * seen 1st or 2nd destination option. 631 * next time we see one, it must be 2nd. 632 */ 633 dstopt = 1; 634 } else if (nxt == IPPROTO_ROUTING) { 635 /* 636 * if we see destionation option next 637 * time, it must be dest2. 638 */ 639 dstopt = 2; 640 } 641 642 /* skip this header */ 643 m_copydata(m, *i, sizeof(ip6e), &ip6e); 644 nxt = ip6e.ip6e_nxt; 645 *off = *i + offsetof(struct ip6_ext, ip6e_nxt); 646 /* 647 * we will never see nxt == IPPROTO_AH 648 * so it is safe to omit AH case. 649 */ 650 *i += (ip6e.ip6e_len + 1) << 3; 651 break; 652 default: 653 return; 654 } 655 } while (*i < m->m_pkthdr.len); 656 } 657 658 static int 659 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 660 { 661 struct in6_addr ia2; 662 663 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 664 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 665 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 666 667 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 668 } 669 670 int 671 ipsec6_process_packet( 672 struct mbuf *m, 673 struct ipsecrequest *isr 674 ) 675 { 676 struct secasvar *sav; 677 struct ip6_hdr *ip6; 678 int s, error, i, off; 679 union sockaddr_union *dst; 680 681 KASSERT(m != NULL); 682 KASSERT(isr != NULL); 683 684 s = splsoftnet(); /* insure SA contents don't change */ 685 686 isr = ipsec_nextisr(m, isr, AF_INET6, &error); 687 if (isr == NULL) { 688 if (error != 0) { 689 /* XXX Should we send a notification ? */ 690 goto bad; 691 } else { 692 if (ipsec_register_done(m, &error) < 0) 693 goto bad; 694 695 splx(s); 696 return ipsec_reinject_ipstack(m, AF_INET6); 697 } 698 } 699 700 sav = isr->sav; 701 dst = &sav->sah->saidx.dst; 702 703 ip6 = mtod(m, struct ip6_hdr *); /* XXX */ 704 705 /* Do the appropriate encapsulation, if necessary */ 706 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 707 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 708 ((dst->sa.sa_family == AF_INET6) && 709 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 710 (!in6_sa_equal_addrwithscope(&dst->sin6, 711 &ip6->ip6_dst)))) { 712 struct mbuf *mp; 713 714 /* Fix IPv6 header payload length. */ 715 if (m->m_len < sizeof(struct ip6_hdr)) 716 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 717 return ENOBUFS; 718 719 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 720 /* No jumbogram support. */ 721 m_freem(m); 722 return ENXIO; /*XXX*/ 723 } 724 725 ip6 = mtod(m, struct ip6_hdr *); 726 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 727 728 /* Encapsulate the packet */ 729 error = ipip_output(m, isr, &mp, 0, 0); 730 if (mp == NULL && !error) { 731 /* Should never happen. */ 732 IPSECLOG(LOG_DEBUG, 733 "ipip_output returns no mbuf and no error!"); 734 error = EFAULT; 735 } 736 737 if (error) { 738 if (mp) { 739 /* XXX: Should never happen! */ 740 m_freem(mp); 741 } 742 m = NULL; /* ipip_output() already freed it */ 743 goto bad; 744 } 745 746 m = mp; 747 mp = NULL; 748 } 749 750 if (dst->sa.sa_family == AF_INET) { 751 struct ip *ip; 752 ip = mtod(m, struct ip *); 753 i = ip->ip_hl << 2; 754 off = offsetof(struct ip, ip_p); 755 } else { 756 compute_ipsec_pos(m, &i, &off); 757 } 758 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 759 splx(s); 760 return error; 761 bad: 762 splx(s); 763 if (m) 764 m_freem(m); 765 return error; 766 } 767 #endif /*INET6*/ 768
Indexes created Tue Sep 23 07:09:52 GMT 2025