1 /* $NetBSD: ipsec_output.c,v 1.31 2011/02/10 20:42:30 drochner 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 1.31 2011/02/10 20:42:30 drochner Exp $"); 33 34 /* 35 * IPsec output processing. 36 */ 37 #include "opt_inet.h" 38 #ifdef __FreeBSD__ 39 #include "opt_inet6.h" 40 #endif 41 #include "opt_ipsec.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/errno.h> 50 #include <sys/syslog.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 #include <netinet/ip.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/in_var.h> 60 #include <netinet/ip_ecn.h> 61 #ifdef INET6 62 # ifdef __FreeBSD__ 63 # include <netinet6/ip6_ecn.h> 64 # endif 65 #endif 66 67 #include <netinet/ip6.h> 68 #ifdef INET6 69 #include <netinet6/ip6_var.h> 70 #endif 71 #include <netinet/in_pcb.h> 72 #ifdef INET6 73 #include <netinet/icmp6.h> 74 #endif 75 #ifdef IPSEC_NAT_T 76 #include <netinet/udp.h> 77 #endif 78 79 #include <netipsec/ipsec.h> 80 #include <netipsec/ipsec_var.h> 81 #include <netipsec/ipsec_private.h> 82 #ifdef INET6 83 #include <netipsec/ipsec6.h> 84 #endif 85 #include <netipsec/ah_var.h> 86 #include <netipsec/esp_var.h> 87 #include <netipsec/ipcomp_var.h> 88 89 #include <netipsec/xform.h> 90 91 #include <netipsec/key.h> 92 #include <netipsec/keydb.h> 93 #include <netipsec/key_debug.h> 94 #include <netipsec/ipsec_osdep.h> 95 96 #include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */ 97 98 99 /* 100 * Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing 101 * It will be used by ip{,6}_output to check if we have already or not 102 * processed this packet. 103 */ 104 static int 105 ipsec_register_done(struct mbuf *m, int * error) 106 { 107 struct m_tag *mtag; 108 109 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT); 110 if (mtag == NULL) { 111 DPRINTF(("ipsec_register_done: could not get packet tag\n")); 112 *error = ENOMEM; 113 return -1; 114 } 115 116 m_tag_prepend(m, mtag); 117 return 0; 118 } 119 120 static int 121 ipsec_reinject_ipstack(struct mbuf *m, int af) 122 { 123 #ifdef INET 124 struct ip * ip; 125 #endif /* INET */ 126 #if defined(INET) || defined(INET6) 127 int rv; 128 #endif 129 130 switch (af) { 131 #ifdef INET 132 case AF_INET: 133 ip = mtod(m, struct ip *); 134 #ifdef __FreeBSD__ 135 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */ 136 ip->ip_len = ntohs(ip->ip_len); 137 ip->ip_off = ntohs(ip->ip_off); 138 #endif /* __FreeBSD_ */ 139 KERNEL_LOCK(1, NULL); 140 rv = ip_output(m, NULL, NULL, IP_RAWOUTPUT|IP_NOIPNEWID, 141 (struct ip_moptions *)NULL, (struct socket *)NULL); 142 KERNEL_UNLOCK_ONE(NULL); 143 return rv; 144 145 #endif /* INET */ 146 #ifdef INET6 147 case AF_INET6: 148 /* 149 * We don't need massage, IPv6 header fields are always in 150 * net endian. 151 */ 152 KERNEL_LOCK(1, NULL); 153 rv = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 154 KERNEL_UNLOCK_ONE(NULL); 155 return rv; 156 #endif /* INET6 */ 157 } 158 159 panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af); 160 return -1; /* NOTREACHED */ 161 } 162 163 int 164 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 165 { 166 struct secasvar *sav; 167 struct secasindex *saidx; 168 int error; 169 #ifdef INET 170 struct ip * ip; 171 #endif /* INET */ 172 #ifdef INET6 173 struct ip6_hdr * ip6; 174 #endif /* INET6 */ 175 #ifdef IPSEC_NAT_T 176 struct mbuf * mo; 177 struct udphdr *udp = NULL; 178 uint64_t * data = NULL; 179 int hlen, roff; 180 #endif /* IPSEC_NAT_T */ 181 182 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 183 184 IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 185 IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 186 sav = isr->sav; 187 IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA")); 188 IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 189 190 saidx = &sav->sah->saidx; 191 192 #ifdef IPSEC_NAT_T 193 if(sav->natt_type != 0) { 194 ip = mtod(m, struct ip *); 195 196 hlen = sizeof(struct udphdr); 197 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 198 hlen += sizeof(uint64_t); 199 200 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 201 if (mo == NULL) { 202 DPRINTF(("ipsec_process_done : failed to inject" 203 "%u byte UDP for SA %s/%08lx\n", 204 hlen, ipsec_address(&saidx->dst), 205 (u_long) ntohl(sav->spi))); 206 error = ENOBUFS; 207 goto bad; 208 } 209 210 udp = (struct udphdr*) (mtod(mo, char*) + roff); 211 data = (uint64_t*) (udp + 1); 212 213 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 214 *data = 0; /* NON-IKE Marker */ 215 216 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 217 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 218 else 219 udp->uh_sport = key_portfromsaddr(&saidx->src); 220 221 udp->uh_dport = key_portfromsaddr(&saidx->dst); 222 udp->uh_sum = 0; 223 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 224 } 225 #endif /* IPSEC_NAT_T */ 226 227 switch (saidx->dst.sa.sa_family) { 228 #ifdef INET 229 case AF_INET: 230 /* Fix the header length, for AH processing. */ 231 ip = mtod(m, struct ip *); 232 ip->ip_len = htons(m->m_pkthdr.len); 233 #ifdef IPSEC_NAT_T 234 if (sav->natt_type != 0) 235 ip->ip_p = IPPROTO_UDP; 236 #endif /* IPSEC_NAT_T */ 237 break; 238 #endif /* INET */ 239 #ifdef INET6 240 case AF_INET6: 241 /* Fix the header length, for AH processing. */ 242 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 243 error = ENXIO; 244 goto bad; 245 } 246 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 247 /* No jumbogram support. */ 248 error = ENXIO; /*?*/ 249 goto bad; 250 } 251 ip6 = mtod(m, struct ip6_hdr *); 252 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 253 #ifdef IPSEC_NAT_T 254 if (sav->natt_type != 0) 255 ip6->ip6_nxt = IPPROTO_UDP; 256 #endif /* IPSEC_NAT_T */ 257 break; 258 #endif /* INET6 */ 259 default: 260 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 261 saidx->dst.sa.sa_family)); 262 error = ENXIO; 263 goto bad; 264 } 265 266 /* 267 * If there's another (bundled) SA to apply, do so. 268 * Note that this puts a burden on the kernel stack size. 269 * If this is a problem we'll need to introduce a queue 270 * to set the packet on so we can unwind the stack before 271 * doing further processing. 272 */ 273 if (isr->next) { 274 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 275 switch ( saidx->dst.sa.sa_family ) { 276 #ifdef INET 277 case AF_INET: 278 return ipsec4_process_packet(m, isr->next, 0,0); 279 #endif /* INET */ 280 #ifdef INET6 281 case AF_INET6: 282 return ipsec6_process_packet(m,isr->next); 283 #endif /* INET6 */ 284 default : 285 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 286 saidx->dst.sa.sa_family)); 287 error = ENXIO; 288 goto bad; 289 } 290 } 291 292 /* 293 * We're done with IPsec processing, 294 * mark that we have already processed the packet 295 * transmit it packet using the appropriate network protocol (IP or IPv6). 296 */ 297 298 if (ipsec_register_done(m, &error) < 0) 299 goto bad; 300 301 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 302 bad: 303 m_freem(m); 304 KEY_FREESAV(&sav); 305 return (error); 306 } 307 308 /* 309 * ipsec_nextisr can return : 310 * - isr == NULL and error != 0 => something is bad : the packet must be 311 * discarded 312 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 313 * is done, reinject it in ip stack 314 * - isr != NULL (error == 0) => we need to apply one rule to the packet 315 */ 316 static struct ipsecrequest * 317 ipsec_nextisr( 318 struct mbuf *m, 319 struct ipsecrequest *isr, 320 int af, 321 struct secasindex *saidx, 322 int *error 323 ) 324 { 325 #define IPSEC_OSTAT(x, y, z) \ 326 do { \ 327 switch (isr->saidx.proto) { \ 328 case IPPROTO_ESP: \ 329 ESP_STATINC(x); \ 330 break; \ 331 case IPPROTO_AH: \ 332 AH_STATINC(y); \ 333 break; \ 334 default: \ 335 IPCOMP_STATINC(z); \ 336 break; \ 337 } \ 338 } while (/*CONSTCOND*/0) 339 340 struct secasvar *sav; 341 342 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 343 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 344 ("ipsec_nextisr: invalid address family %u", af)); 345 again: 346 /* 347 * Craft SA index to search for proper SA. Note that 348 * we only fillin unspecified SA peers for transport 349 * mode; for tunnel mode they must already be filled in. 350 */ 351 *saidx = isr->saidx; 352 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 353 /* Fillin unspecified SA peers only for transport mode */ 354 if (af == AF_INET) { 355 struct sockaddr_in *sin; 356 struct ip *ip = mtod(m, struct ip *); 357 358 if (saidx->src.sa.sa_len == 0) { 359 sin = &saidx->src.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_src; 364 } 365 if (saidx->dst.sa.sa_len == 0) { 366 sin = &saidx->dst.sin; 367 sin->sin_len = sizeof(*sin); 368 sin->sin_family = AF_INET; 369 sin->sin_port = IPSEC_PORT_ANY; 370 sin->sin_addr = ip->ip_dst; 371 } 372 } else { 373 struct sockaddr_in6 *sin6; 374 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 375 376 if (saidx->src.sin6.sin6_len == 0) { 377 sin6 = (struct sockaddr_in6 *)&saidx->src; 378 sin6->sin6_len = sizeof(*sin6); 379 sin6->sin6_family = AF_INET6; 380 sin6->sin6_port = IPSEC_PORT_ANY; 381 sin6->sin6_addr = ip6->ip6_src; 382 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 383 /* fix scope id for comparing SPD */ 384 sin6->sin6_addr.s6_addr16[1] = 0; 385 sin6->sin6_scope_id = 386 ntohs(ip6->ip6_src.s6_addr16[1]); 387 } 388 } 389 if (saidx->dst.sin6.sin6_len == 0) { 390 sin6 = (struct sockaddr_in6 *)&saidx->dst; 391 sin6->sin6_len = sizeof(*sin6); 392 sin6->sin6_family = AF_INET6; 393 sin6->sin6_port = IPSEC_PORT_ANY; 394 sin6->sin6_addr = ip6->ip6_dst; 395 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 396 /* fix scope id for comparing SPD */ 397 sin6->sin6_addr.s6_addr16[1] = 0; 398 sin6->sin6_scope_id = 399 ntohs(ip6->ip6_dst.s6_addr16[1]); 400 } 401 } 402 } 403 } 404 405 /* 406 * Lookup SA and validate it. 407 */ 408 *error = key_checkrequest(isr, saidx); 409 if (*error != 0) { 410 /* 411 * IPsec processing is required, but no SA found. 412 * I assume that key_acquire() had been called 413 * to get/establish the SA. Here I discard 414 * this packet because it is responsibility for 415 * upper layer to retransmit the packet. 416 */ 417 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 418 goto bad; 419 } 420 sav = isr->sav; 421 /* sav may be NULL here if we have an USE rule */ 422 if (sav == NULL) { 423 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 424 ("ipsec_nextisr: no SA found, but required; level %u", 425 ipsec_get_reqlevel(isr))); 426 isr = isr->next; 427 /* 428 * No more rules to apply, return NULL isr and no error 429 * It can happen when the last rules are USE rules 430 * */ 431 if (isr == NULL) { 432 *error = 0; 433 return isr; 434 } 435 goto again; 436 } 437 438 /* 439 * Check system global policy controls. 440 */ 441 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 442 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 443 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 444 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 445 " to policy (check your sysctls)\n")); 446 IPSEC_OSTAT(ESP_STAT_PDROPS, AH_STAT_PDROPS, 447 IPCOMP_STAT_PDROPS); 448 *error = EHOSTUNREACH; 449 goto bad; 450 } 451 452 /* 453 * Sanity check the SA contents for the caller 454 * before they invoke the xform output method. 455 */ 456 if (sav->tdb_xform == NULL) { 457 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 458 IPSEC_OSTAT(ESP_STAT_NOXFORM, AH_STAT_NOXFORM, 459 IPCOMP_STAT_NOXFORM); 460 *error = EHOSTUNREACH; 461 goto bad; 462 } 463 return isr; 464 bad: 465 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 466 return NULL; 467 #undef IPSEC_OSTAT 468 } 469 470 #ifdef INET 471 /* 472 * IPsec output logic for IPv4. 473 */ 474 int 475 ipsec4_process_packet( 476 struct mbuf *m, 477 struct ipsecrequest *isr, 478 int flags, 479 int tunalready 480 ) 481 { 482 struct secasindex saidx; 483 struct secasvar *sav; 484 struct ip *ip; 485 int s, error, i, off; 486 487 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 488 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 489 490 s = splsoftnet(); /* insure SA contents don't change */ 491 492 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 493 if (isr == NULL) { 494 if (error != 0) { 495 goto bad; 496 } else { 497 if (ipsec_register_done(m, &error) < 0) 498 goto bad; 499 500 splx(s); 501 return ipsec_reinject_ipstack(m, AF_INET); 502 } 503 } 504 505 sav = isr->sav; 506 if (!tunalready) { 507 union sockaddr_union *dst = &sav->sah->saidx.dst; 508 int setdf; 509 510 /* 511 * Collect IP_DF state from the outer header. 512 */ 513 if (dst->sa.sa_family == AF_INET) { 514 if (m->m_len < sizeof (struct ip) && 515 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 516 error = ENOBUFS; 517 goto bad; 518 } 519 ip = mtod(m, struct ip *); 520 /* Honor system-wide control of how to handle IP_DF */ 521 switch (ip4_ipsec_dfbit) { 522 case 0: /* clear in outer header */ 523 case 1: /* set in outer header */ 524 setdf = ip4_ipsec_dfbit; 525 break; 526 default: /* propagate to outer header */ 527 setdf = ip->ip_off; 528 #ifndef __FreeBSD__ 529 /* On FreeBSD, ip_off and ip_len assumed in host endian. */ 530 setdf = ntohs(setdf); 531 #endif 532 setdf = htons(setdf & IP_DF); 533 break; 534 } 535 } else { 536 ip = NULL; /* keep compiler happy */ 537 setdf = 0; 538 } 539 /* Do the appropriate encapsulation, if necessary */ 540 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 541 dst->sa.sa_family != AF_INET || /* PF mismatch */ 542 #if 0 543 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 544 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 545 #endif 546 (dst->sa.sa_family == AF_INET && /* Proxy */ 547 dst->sin.sin_addr.s_addr != INADDR_ANY && 548 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 549 struct mbuf *mp; 550 551 /* Fix IPv4 header checksum and length */ 552 if (m->m_len < sizeof (struct ip) && 553 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 554 error = ENOBUFS; 555 goto bad; 556 } 557 ip = mtod(m, struct ip *); 558 ip->ip_len = htons(m->m_pkthdr.len); 559 ip->ip_sum = 0; 560 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 561 562 /* Encapsulate the packet */ 563 error = ipip_output(m, isr, &mp, 0, 0); 564 if (mp == NULL && !error) { 565 /* Should never happen. */ 566 DPRINTF(("ipsec4_process_packet: ipip_output " 567 "returns no mbuf and no error!")); 568 error = EFAULT; 569 } 570 if (error) { 571 if (mp) { 572 /* XXX: Should never happen! */ 573 m_freem(mp); 574 } 575 m = NULL; /* ipip_output() already freed it */ 576 goto bad; 577 } 578 m = mp, mp = NULL; 579 /* 580 * ipip_output clears IP_DF in the new header. If 581 * we need to propagate IP_DF from the outer header, 582 * then we have to do it here. 583 * 584 * XXX shouldn't assume what ipip_output does. 585 */ 586 if (dst->sa.sa_family == AF_INET && setdf) { 587 if (m->m_len < sizeof (struct ip) && 588 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 589 error = ENOBUFS; 590 goto bad; 591 } 592 ip = mtod(m, struct ip *); 593 ip->ip_off |= IP_OFF_CONVERT(IP_DF); 594 } 595 } 596 } 597 598 /* 599 * Dispatch to the appropriate IPsec transform logic. The 600 * packet will be returned for transmission after crypto 601 * processing, etc. are completed. For encapsulation we 602 * bypass this call because of the explicit call done above 603 * (necessary to deal with IP_DF handling for IPv4). 604 * 605 * NB: m & sav are ``passed to caller'' who's reponsible for 606 * for reclaiming their resources. 607 */ 608 if (sav->tdb_xform->xf_type != XF_IP4) { 609 ip = mtod(m, struct ip *); 610 i = ip->ip_hl << 2; 611 off = offsetof(struct ip, ip_p); 612 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 613 } else { 614 error = ipsec_process_done(m, isr); 615 } 616 splx(s); 617 return error; 618 bad: 619 splx(s); 620 if (m) 621 m_freem(m); 622 return error; 623 } 624 #endif 625 626 #ifdef INET6 627 int 628 ipsec6_process_packet( 629 struct mbuf *m, 630 struct ipsecrequest *isr 631 ) 632 { 633 struct secasindex saidx; 634 struct secasvar *sav; 635 struct ip6_hdr *ip6; 636 int s, error, i, off; 637 638 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 639 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 640 641 s = splsoftnet(); /* insure SA contents don't change */ 642 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 643 if (isr == NULL) { 644 if (error != 0) { 645 // XXX Should we send a notification ? 646 goto bad; 647 } else { 648 if (ipsec_register_done(m, &error) < 0) 649 goto bad; 650 651 splx(s); 652 return ipsec_reinject_ipstack(m, AF_INET6); 653 } 654 } 655 656 sav = isr->sav; 657 if (sav->tdb_xform->xf_type != XF_IP4) { 658 i = sizeof(struct ip6_hdr); 659 off = offsetof(struct ip6_hdr, ip6_nxt); 660 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 661 } else { 662 union sockaddr_union *dst = &sav->sah->saidx.dst; 663 664 ip6 = mtod(m, struct ip6_hdr *); 665 666 /* Do the appropriate encapsulation, if necessary */ 667 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 668 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 669 ((dst->sa.sa_family == AF_INET6) && 670 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 671 (!IN6_ARE_ADDR_EQUAL(&dst->sin6.sin6_addr, 672 &ip6->ip6_dst))) 673 ) 674 { 675 struct mbuf *mp; 676 /* Fix IPv6 header payload length. */ 677 if (m->m_len < sizeof(struct ip6_hdr)) 678 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 679 return ENOBUFS; 680 681 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 682 /* No jumbogram support. */ 683 m_freem(m); 684 return ENXIO; /*XXX*/ 685 } 686 ip6 = mtod(m, struct ip6_hdr *); 687 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 688 689 /* Encapsulate the packet */ 690 error = ipip_output(m, isr, &mp, 0, 0); 691 if (mp == NULL && !error) { 692 /* Should never happen. */ 693 DPRINTF(("ipsec6_process_packet: ipip_output " 694 "returns no mbuf and no error!")); 695 error = EFAULT; 696 } 697 698 if (error) { 699 if (mp) { 700 /* XXX: Should never happen! */ 701 m_freem(mp); 702 } 703 m = NULL; /* ipip_output() already freed it */ 704 goto bad; 705 } 706 707 m = mp; 708 mp = NULL; 709 } 710 711 error = ipsec_process_done(m,isr); 712 } 713 splx(s); 714 return error; 715 bad: 716 splx(s); 717 if (m) 718 m_freem(m); 719 return error; 720 } 721 #endif /*INET6*/ 722