1 /* $NetBSD: ipsec_output.c,v 1.41 2015/03/30 03:51:50 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 1.41 2015/03/30 03:51:50 ozaki-r Exp $"); 33 34 /* 35 * IPsec output processing. 36 */ 37 #include "opt_inet.h" 38 #ifdef __FreeBSD__ 39 #include "opt_inet6.h" 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/errno.h> 49 #include <sys/syslog.h> 50 51 #include <net/if.h> 52 #include <net/route.h> 53 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/ip.h> 57 #include <netinet/ip_var.h> 58 #include <netinet/in_var.h> 59 #include <netinet/ip_ecn.h> 60 #ifdef INET6 61 # ifdef __FreeBSD__ 62 # include <netinet6/ip6_ecn.h> 63 # endif 64 #endif 65 66 #include <netinet/ip6.h> 67 #ifdef INET6 68 #include <netinet6/ip6_var.h> 69 #endif 70 #include <netinet/in_pcb.h> 71 #ifdef INET6 72 #include <netinet/icmp6.h> 73 #endif 74 #include <netinet/udp.h> 75 76 #include <netipsec/ipsec.h> 77 #include <netipsec/ipsec_var.h> 78 #include <netipsec/ipsec_private.h> 79 #ifdef INET6 80 #include <netipsec/ipsec6.h> 81 #endif 82 #include <netipsec/ah_var.h> 83 #include <netipsec/esp_var.h> 84 #include <netipsec/ipcomp_var.h> 85 86 #include <netipsec/xform.h> 87 88 #include <netipsec/key.h> 89 #include <netipsec/keydb.h> 90 #include <netipsec/key_debug.h> 91 #include <netipsec/ipsec_osdep.h> 92 93 #include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */ 94 95 96 /* 97 * Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing 98 * It will be used by ip{,6}_output to check if we have already or not 99 * processed this packet. 100 */ 101 static int 102 ipsec_register_done(struct mbuf *m, int * error) 103 { 104 struct m_tag *mtag; 105 106 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT); 107 if (mtag == NULL) { 108 DPRINTF(("ipsec_register_done: could not get packet tag\n")); 109 *error = ENOMEM; 110 return -1; 111 } 112 113 m_tag_prepend(m, mtag); 114 return 0; 115 } 116 117 static int 118 ipsec_reinject_ipstack(struct mbuf *m, int af) 119 { 120 #ifdef INET 121 #ifdef __FreeBSD__ 122 struct ip *ip; 123 #endif /* __FreeBSD_ */ 124 #endif /* INET */ 125 #if defined(INET) || defined(INET6) 126 int rv; 127 #endif 128 129 switch (af) { 130 #ifdef INET 131 case AF_INET: 132 #ifdef __FreeBSD__ 133 ip = mtod(m, struct ip *); 134 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */ 135 ip->ip_len = ntohs(ip->ip_len); 136 ip->ip_off = ntohs(ip->ip_off); 137 #endif /* __FreeBSD_ */ 138 KERNEL_LOCK(1, NULL); 139 rv = ip_output(m, NULL, NULL, IP_RAWOUTPUT|IP_NOIPNEWID, 140 NULL, NULL); 141 KERNEL_UNLOCK_ONE(NULL); 142 return rv; 143 144 #endif /* INET */ 145 #ifdef INET6 146 case AF_INET6: 147 /* 148 * We don't need massage, IPv6 header fields are always in 149 * net endian. 150 */ 151 KERNEL_LOCK(1, NULL); 152 rv = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 153 KERNEL_UNLOCK_ONE(NULL); 154 return rv; 155 #endif /* INET6 */ 156 } 157 158 panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af); 159 return -1; /* NOTREACHED */ 160 } 161 162 int 163 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 164 { 165 struct secasvar *sav; 166 struct secasindex *saidx; 167 int error; 168 #ifdef INET 169 struct ip * ip; 170 #endif /* INET */ 171 #ifdef INET6 172 struct ip6_hdr * ip6; 173 #endif /* INET6 */ 174 struct mbuf * mo; 175 struct udphdr *udp = NULL; 176 uint64_t * data = NULL; 177 int hlen, roff; 178 179 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 180 181 IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 182 IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 183 sav = isr->sav; 184 IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA")); 185 IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 186 187 saidx = &sav->sah->saidx; 188 189 if(sav->natt_type != 0) { 190 ip = mtod(m, struct ip *); 191 192 hlen = sizeof(struct udphdr); 193 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 194 hlen += sizeof(uint64_t); 195 196 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 197 if (mo == NULL) { 198 DPRINTF(("ipsec_process_done : failed to inject" 199 "%u byte UDP for SA %s/%08lx\n", 200 hlen, ipsec_address(&saidx->dst), 201 (u_long) ntohl(sav->spi))); 202 error = ENOBUFS; 203 goto bad; 204 } 205 206 udp = (struct udphdr*) (mtod(mo, char*) + roff); 207 data = (uint64_t*) (udp + 1); 208 209 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 210 *data = 0; /* NON-IKE Marker */ 211 212 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 213 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 214 else 215 udp->uh_sport = key_portfromsaddr(&saidx->src); 216 217 udp->uh_dport = key_portfromsaddr(&saidx->dst); 218 udp->uh_sum = 0; 219 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 220 } 221 222 switch (saidx->dst.sa.sa_family) { 223 #ifdef INET 224 case AF_INET: 225 /* Fix the header length, for AH processing. */ 226 ip = mtod(m, struct ip *); 227 ip->ip_len = htons(m->m_pkthdr.len); 228 if (sav->natt_type != 0) 229 ip->ip_p = IPPROTO_UDP; 230 break; 231 #endif /* INET */ 232 #ifdef INET6 233 case AF_INET6: 234 /* Fix the header length, for AH processing. */ 235 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 236 error = ENXIO; 237 goto bad; 238 } 239 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 240 /* No jumbogram support. */ 241 error = ENXIO; /*?*/ 242 goto bad; 243 } 244 ip6 = mtod(m, struct ip6_hdr *); 245 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 246 if (sav->natt_type != 0) 247 ip6->ip6_nxt = IPPROTO_UDP; 248 break; 249 #endif /* INET6 */ 250 default: 251 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 252 saidx->dst.sa.sa_family)); 253 error = ENXIO; 254 goto bad; 255 } 256 257 key_sa_recordxfer(sav, m); 258 259 /* 260 * If there's another (bundled) SA to apply, do so. 261 * Note that this puts a burden on the kernel stack size. 262 * If this is a problem we'll need to introduce a queue 263 * to set the packet on so we can unwind the stack before 264 * doing further processing. 265 */ 266 if (isr->next) { 267 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 268 switch ( saidx->dst.sa.sa_family ) { 269 #ifdef INET 270 case AF_INET: 271 return ipsec4_process_packet(m, isr->next, 0,0); 272 #endif /* INET */ 273 #ifdef INET6 274 case AF_INET6: 275 return ipsec6_process_packet(m,isr->next); 276 #endif /* INET6 */ 277 default : 278 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 279 saidx->dst.sa.sa_family)); 280 error = ENXIO; 281 goto bad; 282 } 283 } 284 285 /* 286 * We're done with IPsec processing, 287 * mark that we have already processed the packet 288 * transmit it packet using the appropriate network protocol (IP or IPv6). 289 */ 290 291 if (ipsec_register_done(m, &error) < 0) 292 goto bad; 293 294 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 295 bad: 296 m_freem(m); 297 KEY_FREESAV(&sav); 298 return (error); 299 } 300 301 /* 302 * ipsec_nextisr can return : 303 * - isr == NULL and error != 0 => something is bad : the packet must be 304 * discarded 305 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 306 * is done, reinject it in ip stack 307 * - isr != NULL (error == 0) => we need to apply one rule to the packet 308 */ 309 static struct ipsecrequest * 310 ipsec_nextisr( 311 struct mbuf *m, 312 struct ipsecrequest *isr, 313 int af, 314 struct secasindex *saidx, 315 int *error 316 ) 317 { 318 #define IPSEC_OSTAT(x, y, z) \ 319 do { \ 320 switch (isr->saidx.proto) { \ 321 case IPPROTO_ESP: \ 322 ESP_STATINC(x); \ 323 break; \ 324 case IPPROTO_AH: \ 325 AH_STATINC(y); \ 326 break; \ 327 default: \ 328 IPCOMP_STATINC(z); \ 329 break; \ 330 } \ 331 } while (/*CONSTCOND*/0) 332 333 struct secasvar *sav; 334 335 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 336 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 337 ("ipsec_nextisr: invalid address family %u", af)); 338 again: 339 /* 340 * Craft SA index to search for proper SA. Note that 341 * we only fillin unspecified SA peers for transport 342 * mode; for tunnel mode they must already be filled in. 343 */ 344 *saidx = isr->saidx; 345 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 346 /* Fillin unspecified SA peers only for transport mode */ 347 if (af == AF_INET) { 348 struct sockaddr_in *sin; 349 struct ip *ip = mtod(m, struct ip *); 350 351 if (saidx->src.sa.sa_len == 0) { 352 sin = &saidx->src.sin; 353 sin->sin_len = sizeof(*sin); 354 sin->sin_family = AF_INET; 355 sin->sin_port = IPSEC_PORT_ANY; 356 sin->sin_addr = ip->ip_src; 357 } 358 if (saidx->dst.sa.sa_len == 0) { 359 sin = &saidx->dst.sin; 360 sin->sin_len = sizeof(*sin); 361 sin->sin_family = AF_INET; 362 sin->sin_port = IPSEC_PORT_ANY; 363 sin->sin_addr = ip->ip_dst; 364 } 365 } else { 366 struct sockaddr_in6 *sin6; 367 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 368 369 if (saidx->src.sin6.sin6_len == 0) { 370 sin6 = (struct sockaddr_in6 *)&saidx->src; 371 sin6->sin6_len = sizeof(*sin6); 372 sin6->sin6_family = AF_INET6; 373 sin6->sin6_port = IPSEC_PORT_ANY; 374 sin6->sin6_addr = ip6->ip6_src; 375 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 376 /* fix scope id for comparing SPD */ 377 sin6->sin6_addr.s6_addr16[1] = 0; 378 sin6->sin6_scope_id = 379 ntohs(ip6->ip6_src.s6_addr16[1]); 380 } 381 } 382 if (saidx->dst.sin6.sin6_len == 0) { 383 sin6 = (struct sockaddr_in6 *)&saidx->dst; 384 sin6->sin6_len = sizeof(*sin6); 385 sin6->sin6_family = AF_INET6; 386 sin6->sin6_port = IPSEC_PORT_ANY; 387 sin6->sin6_addr = ip6->ip6_dst; 388 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 389 /* fix scope id for comparing SPD */ 390 sin6->sin6_addr.s6_addr16[1] = 0; 391 sin6->sin6_scope_id = 392 ntohs(ip6->ip6_dst.s6_addr16[1]); 393 } 394 } 395 } 396 } 397 398 /* 399 * Lookup SA and validate it. 400 */ 401 *error = key_checkrequest(isr, saidx); 402 if (*error != 0) { 403 /* 404 * IPsec processing is required, but no SA found. 405 * I assume that key_acquire() had been called 406 * to get/establish the SA. Here I discard 407 * this packet because it is responsibility for 408 * upper layer to retransmit the packet. 409 */ 410 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 411 goto bad; 412 } 413 sav = isr->sav; 414 /* sav may be NULL here if we have an USE rule */ 415 if (sav == NULL) { 416 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 417 ("ipsec_nextisr: no SA found, but required; level %u", 418 ipsec_get_reqlevel(isr))); 419 isr = isr->next; 420 /* 421 * No more rules to apply, return NULL isr and no error 422 * It can happen when the last rules are USE rules 423 * */ 424 if (isr == NULL) { 425 *error = 0; 426 return isr; 427 } 428 goto again; 429 } 430 431 /* 432 * Check system global policy controls. 433 */ 434 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 435 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 436 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 437 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 438 " to policy (check your sysctls)\n")); 439 IPSEC_OSTAT(ESP_STAT_PDROPS, AH_STAT_PDROPS, 440 IPCOMP_STAT_PDROPS); 441 *error = EHOSTUNREACH; 442 goto bad; 443 } 444 445 /* 446 * Sanity check the SA contents for the caller 447 * before they invoke the xform output method. 448 */ 449 if (sav->tdb_xform == NULL) { 450 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 451 IPSEC_OSTAT(ESP_STAT_NOXFORM, AH_STAT_NOXFORM, 452 IPCOMP_STAT_NOXFORM); 453 *error = EHOSTUNREACH; 454 goto bad; 455 } 456 return isr; 457 bad: 458 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 459 return NULL; 460 #undef IPSEC_OSTAT 461 } 462 463 #ifdef INET 464 /* 465 * IPsec output logic for IPv4. 466 */ 467 int 468 ipsec4_process_packet( 469 struct mbuf *m, 470 struct ipsecrequest *isr, 471 int flags, 472 int tunalready 473 ) 474 { 475 struct secasindex saidx; 476 struct secasvar *sav; 477 struct ip *ip; 478 int s, error, i, off; 479 480 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 481 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 482 483 s = splsoftnet(); /* insure SA contents don't change */ 484 485 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 486 if (isr == NULL) { 487 if (error != 0) { 488 goto bad; 489 } else { 490 if (ipsec_register_done(m, &error) < 0) 491 goto bad; 492 493 splx(s); 494 return ipsec_reinject_ipstack(m, AF_INET); 495 } 496 } 497 498 sav = isr->sav; 499 if (!tunalready) { 500 union sockaddr_union *dst = &sav->sah->saidx.dst; 501 int setdf; 502 503 /* 504 * Collect IP_DF state from the outer header. 505 */ 506 if (dst->sa.sa_family == AF_INET) { 507 if (m->m_len < sizeof (struct ip) && 508 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 509 error = ENOBUFS; 510 goto bad; 511 } 512 ip = mtod(m, struct ip *); 513 /* Honor system-wide control of how to handle IP_DF */ 514 switch (ip4_ipsec_dfbit) { 515 case 0: /* clear in outer header */ 516 case 1: /* set in outer header */ 517 setdf = ip4_ipsec_dfbit; 518 break; 519 default: /* propagate to outer header */ 520 setdf = ip->ip_off; 521 #ifndef __FreeBSD__ 522 /* On FreeBSD, ip_off and ip_len assumed in host endian. */ 523 setdf = ntohs(setdf); 524 #endif 525 setdf = htons(setdf & IP_DF); 526 break; 527 } 528 } else { 529 ip = NULL; /* keep compiler happy */ 530 setdf = 0; 531 } 532 /* Do the appropriate encapsulation, if necessary */ 533 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 534 dst->sa.sa_family != AF_INET || /* PF mismatch */ 535 #if 0 536 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 537 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 538 #endif 539 (dst->sa.sa_family == AF_INET && /* Proxy */ 540 dst->sin.sin_addr.s_addr != INADDR_ANY && 541 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 542 struct mbuf *mp; 543 544 /* Fix IPv4 header checksum and length */ 545 if (m->m_len < sizeof (struct ip) && 546 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 547 error = ENOBUFS; 548 goto bad; 549 } 550 ip = mtod(m, struct ip *); 551 ip->ip_len = htons(m->m_pkthdr.len); 552 ip->ip_sum = 0; 553 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 554 555 /* Encapsulate the packet */ 556 error = ipip_output(m, isr, &mp, 0, 0); 557 if (mp == NULL && !error) { 558 /* Should never happen. */ 559 DPRINTF(("ipsec4_process_packet: ipip_output " 560 "returns no mbuf and no error!")); 561 error = EFAULT; 562 } 563 if (error) { 564 if (mp) { 565 /* XXX: Should never happen! */ 566 m_freem(mp); 567 } 568 m = NULL; /* ipip_output() already freed it */ 569 goto bad; 570 } 571 m = mp, mp = NULL; 572 /* 573 * ipip_output clears IP_DF in the new header. If 574 * we need to propagate IP_DF from the outer header, 575 * then we have to do it here. 576 * 577 * XXX shouldn't assume what ipip_output does. 578 */ 579 if (dst->sa.sa_family == AF_INET && setdf) { 580 if (m->m_len < sizeof (struct ip) && 581 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 582 error = ENOBUFS; 583 goto bad; 584 } 585 ip = mtod(m, struct ip *); 586 ip->ip_off |= IP_OFF_CONVERT(IP_DF); 587 } 588 } 589 } 590 591 /* 592 * Dispatch to the appropriate IPsec transform logic. The 593 * packet will be returned for transmission after crypto 594 * processing, etc. are completed. For encapsulation we 595 * bypass this call because of the explicit call done above 596 * (necessary to deal with IP_DF handling for IPv4). 597 * 598 * NB: m & sav are ``passed to caller'' who's reponsible for 599 * for reclaiming their resources. 600 */ 601 if (sav->tdb_xform->xf_type != XF_IP4) { 602 union sockaddr_union *dst = &sav->sah->saidx.dst; 603 if (dst->sa.sa_family == AF_INET) { 604 ip = mtod(m, struct ip *); 605 i = ip->ip_hl << 2; 606 off = offsetof(struct ip, ip_p); 607 } else { 608 i = sizeof(struct ip6_hdr); 609 off = offsetof(struct ip6_hdr, ip6_nxt); 610 } 611 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 612 } else { 613 error = ipsec_process_done(m, isr); 614 } 615 splx(s); 616 return error; 617 bad: 618 splx(s); 619 if (m) 620 m_freem(m); 621 return error; 622 } 623 #endif 624 625 #ifdef INET6 626 static void 627 compute_ipsec_pos(struct mbuf *m, int *i, int *off) 628 { 629 int nxt; 630 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr*); 631 struct ip6_ext ip6e; 632 int dstopt = 0; 633 634 *i = sizeof(struct ip6_hdr); 635 *off = offsetof(struct ip6_hdr, ip6_nxt); 636 nxt = ip6->ip6_nxt; 637 638 /* 639 * chase mbuf chain to find the appropriate place to 640 * put AH/ESP/IPcomp header. 641 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 642 */ 643 do { 644 switch (nxt) { 645 case IPPROTO_AH: 646 case IPPROTO_ESP: 647 case IPPROTO_IPCOMP: 648 /* 649 * we should not skip security header added 650 * beforehand. 651 */ 652 return; 653 654 case IPPROTO_HOPOPTS: 655 case IPPROTO_DSTOPTS: 656 case IPPROTO_ROUTING: 657 /* 658 * if we see 2nd destination option header, 659 * we should stop there. 660 */ 661 if (nxt == IPPROTO_DSTOPTS && dstopt) 662 return; 663 664 if (nxt == IPPROTO_DSTOPTS) { 665 /* 666 * seen 1st or 2nd destination option. 667 * next time we see one, it must be 2nd. 668 */ 669 dstopt = 1; 670 } else if (nxt == IPPROTO_ROUTING) { 671 /* 672 * if we see destionation option next 673 * time, it must be dest2. 674 */ 675 dstopt = 2; 676 } 677 678 /* skip this header */ 679 m_copydata(m, *i, sizeof(ip6e), &ip6e); 680 nxt = ip6e.ip6e_nxt; 681 *off = *i + offsetof(struct ip6_ext, ip6e_nxt); 682 /* 683 * we will never see nxt == IPPROTO_AH 684 * so it is safe to omit AH case. 685 */ 686 *i += (ip6e.ip6e_len + 1) << 3; 687 break; 688 default: 689 return; 690 } 691 } while (*i < m->m_pkthdr.len); 692 } 693 694 static int 695 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 696 { 697 struct in6_addr ia2; 698 699 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 700 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 701 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 702 703 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 704 } 705 706 int 707 ipsec6_process_packet( 708 struct mbuf *m, 709 struct ipsecrequest *isr 710 ) 711 { 712 struct secasindex saidx; 713 struct secasvar *sav; 714 struct ip6_hdr *ip6; 715 int s, error, i, off; 716 union sockaddr_union *dst; 717 718 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 719 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 720 721 s = splsoftnet(); /* insure SA contents don't change */ 722 723 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 724 if (isr == NULL) { 725 if (error != 0) { 726 /* XXX Should we send a notification ? */ 727 goto bad; 728 } else { 729 if (ipsec_register_done(m, &error) < 0) 730 goto bad; 731 732 splx(s); 733 return ipsec_reinject_ipstack(m, AF_INET6); 734 } 735 } 736 737 sav = isr->sav; 738 dst = &sav->sah->saidx.dst; 739 740 ip6 = mtod(m, struct ip6_hdr *); /* XXX */ 741 742 /* Do the appropriate encapsulation, if necessary */ 743 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 744 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 745 ((dst->sa.sa_family == AF_INET6) && 746 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 747 (!in6_sa_equal_addrwithscope(&dst->sin6, 748 &ip6->ip6_dst)))) { 749 struct mbuf *mp; 750 751 /* Fix IPv6 header payload length. */ 752 if (m->m_len < sizeof(struct ip6_hdr)) 753 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 754 return ENOBUFS; 755 756 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 757 /* No jumbogram support. */ 758 m_freem(m); 759 return ENXIO; /*XXX*/ 760 } 761 762 ip6 = mtod(m, struct ip6_hdr *); 763 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 764 765 /* Encapsulate the packet */ 766 error = ipip_output(m, isr, &mp, 0, 0); 767 if (mp == NULL && !error) { 768 /* Should never happen. */ 769 DPRINTF(("ipsec6_process_packet: ipip_output " 770 "returns no mbuf and no error!")); 771 error = EFAULT; 772 } 773 774 if (error) { 775 if (mp) { 776 /* XXX: Should never happen! */ 777 m_freem(mp); 778 } 779 m = NULL; /* ipip_output() already freed it */ 780 goto bad; 781 } 782 783 m = mp; 784 mp = NULL; 785 } 786 787 if (dst->sa.sa_family == AF_INET) { 788 struct ip *ip; 789 ip = mtod(m, struct ip *); 790 i = ip->ip_hl << 2; 791 off = offsetof(struct ip, ip_p); 792 } else { 793 compute_ipsec_pos(m, &i, &off); 794 } 795 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 796 splx(s); 797 return error; 798 bad: 799 splx(s); 800 if (m) 801 m_freem(m); 802 return error; 803 } 804 #endif /*INET6*/ 805