Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/ipsec_output.c
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1 /* $NetBSD: ipsec_output.c,v 1.28 2008/04/28 17:40:11 degroote 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 1.28 2008/04/28 17:40:11 degroote 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 */ 126 127 switch (af) { 128 #ifdef INET 129 case AF_INET: 130 ip = mtod(m, struct ip *); 131 #ifdef __FreeBSD__ 132 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */ 133 ip->ip_len = ntohs(ip->ip_len); 134 ip->ip_off = ntohs(ip->ip_off); 135 #endif /* __FreeBSD_ */ 136 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, 137 (struct ip_moptions *)NULL, (struct socket *)NULL); 138 139 #endif /* INET */ 140 #ifdef INET6 141 case AF_INET6: 142 /* 143 * We don't need massage, IPv6 header fields are always in 144 * net endian. 145 */ 146 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 147 #endif /* INET6 */ 148 } 149 150 panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af); 151 return -1; /* NOTREACHED */ 152 } 153 154 int 155 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 156 { 157 struct secasvar *sav; 158 struct secasindex *saidx; 159 int error; 160 #ifdef INET 161 struct ip * ip; 162 #endif /* INET */ 163 #ifdef INET6 164 struct ip6_hdr * ip6; 165 #endif /* INET6 */ 166 #ifdef IPSEC_NAT_T 167 struct mbuf * mo; 168 struct udphdr *udp = NULL; 169 uint64_t * data = NULL; 170 int hlen, roff; 171 #endif /* IPSEC_NAT_T */ 172 173 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 174 175 IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 176 IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 177 sav = isr->sav; 178 IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA")); 179 IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 180 181 saidx = &sav->sah->saidx; 182 183 #ifdef IPSEC_NAT_T 184 if(sav->natt_type != 0) { 185 ip = mtod(m, struct ip *); 186 187 hlen = sizeof(struct udphdr); 188 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 189 hlen += sizeof(uint64_t); 190 191 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 192 if (mo == NULL) { 193 DPRINTF(("ipsec_process_done : failed to inject" 194 "%u byte UDP for SA %s/%08lx\n", 195 hlen, ipsec_address(&saidx->dst), 196 (u_long) ntohl(sav->spi))); 197 error = ENOBUFS; 198 goto bad; 199 } 200 201 udp = (struct udphdr*) (mtod(mo, char*) + roff); 202 data = (uint64_t*) (udp + 1); 203 204 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 205 *data = 0; /* NON-IKE Marker */ 206 207 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 208 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 209 else 210 udp->uh_sport = key_portfromsaddr(&saidx->src); 211 212 udp->uh_dport = key_portfromsaddr(&saidx->dst); 213 udp->uh_sum = 0; 214 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 215 } 216 #endif /* IPSEC_NAT_T */ 217 218 switch (saidx->dst.sa.sa_family) { 219 #ifdef INET 220 case AF_INET: 221 /* Fix the header length, for AH processing. */ 222 ip = mtod(m, struct ip *); 223 ip->ip_len = htons(m->m_pkthdr.len); 224 #ifdef IPSEC_NAT_T 225 if (sav->natt_type != 0) 226 ip->ip_p = IPPROTO_UDP; 227 #endif /* IPSEC_NAT_T */ 228 break; 229 #endif /* INET */ 230 #ifdef INET6 231 case AF_INET6: 232 /* Fix the header length, for AH processing. */ 233 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 234 error = ENXIO; 235 goto bad; 236 } 237 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 238 /* No jumbogram support. */ 239 error = ENXIO; /*?*/ 240 goto bad; 241 } 242 ip6 = mtod(m, struct ip6_hdr *); 243 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 244 #ifdef IPSEC_NAT_T 245 if (sav->natt_type != 0) 246 ip6->ip6_nxt = IPPROTO_UDP; 247 #endif /* IPSEC_NAT_T */ 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 /* 258 * If there's another (bundled) SA to apply, do so. 259 * Note that this puts a burden on the kernel stack size. 260 * If this is a problem we'll need to introduce a queue 261 * to set the packet on so we can unwind the stack before 262 * doing further processing. 263 */ 264 if (isr->next) { 265 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 266 switch ( saidx->dst.sa.sa_family ) { 267 #ifdef INET 268 case AF_INET: 269 return ipsec4_process_packet(m, isr->next, 0,0); 270 #endif /* INET */ 271 #ifdef INET6 272 case AF_INET6: 273 return ipsec6_process_packet(m,isr->next); 274 #endif /* INET6 */ 275 default : 276 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 277 saidx->dst.sa.sa_family)); 278 error = ENXIO; 279 goto bad; 280 } 281 } 282 283 /* 284 * We're done with IPsec processing, 285 * mark that we have already processed the packet 286 * transmit it packet using the appropriate network protocol (IP or IPv6). 287 */ 288 289 if (ipsec_register_done(m, &error) < 0) 290 goto bad; 291 292 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 293 bad: 294 m_freem(m); 295 KEY_FREESAV(&sav); 296 return (error); 297 } 298 299 /* 300 * ipsec_nextisr can return : 301 * - isr == NULL and error != 0 => something is bad : the packet must be 302 * discarded 303 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 304 * is done, reinject it in ip stack 305 * - isr != NULL (error == 0) => we need to apply one rule to the packet 306 */ 307 static struct ipsecrequest * 308 ipsec_nextisr( 309 struct mbuf *m, 310 struct ipsecrequest *isr, 311 int af, 312 struct secasindex *saidx, 313 int *error 314 ) 315 { 316 #define IPSEC_OSTAT(x, y, z) \ 317 do { \ 318 switch (isr->saidx.proto) { \ 319 case IPPROTO_ESP: \ 320 ESP_STATINC(x); \ 321 break; \ 322 case IPPROTO_AH: \ 323 AH_STATINC(y); \ 324 break; \ 325 default: \ 326 IPCOMP_STATINC(z); \ 327 break; \ 328 } \ 329 } while (/*CONSTCOND*/0) 330 331 struct secasvar *sav; 332 333 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 334 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 335 ("ipsec_nextisr: invalid address family %u", af)); 336 again: 337 /* 338 * Craft SA index to search for proper SA. Note that 339 * we only fillin unspecified SA peers for transport 340 * mode; for tunnel mode they must already be filled in. 341 */ 342 *saidx = isr->saidx; 343 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 344 /* Fillin unspecified SA peers only for transport mode */ 345 if (af == AF_INET) { 346 struct sockaddr_in *sin; 347 struct ip *ip = mtod(m, struct ip *); 348 349 if (saidx->src.sa.sa_len == 0) { 350 sin = &saidx->src.sin; 351 sin->sin_len = sizeof(*sin); 352 sin->sin_family = AF_INET; 353 sin->sin_port = IPSEC_PORT_ANY; 354 sin->sin_addr = ip->ip_src; 355 } 356 if (saidx->dst.sa.sa_len == 0) { 357 sin = &saidx->dst.sin; 358 sin->sin_len = sizeof(*sin); 359 sin->sin_family = AF_INET; 360 sin->sin_port = IPSEC_PORT_ANY; 361 sin->sin_addr = ip->ip_dst; 362 } 363 } else { 364 struct sockaddr_in6 *sin6; 365 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 366 367 if (saidx->src.sin6.sin6_len == 0) { 368 sin6 = (struct sockaddr_in6 *)&saidx->src; 369 sin6->sin6_len = sizeof(*sin6); 370 sin6->sin6_family = AF_INET6; 371 sin6->sin6_port = IPSEC_PORT_ANY; 372 sin6->sin6_addr = ip6->ip6_src; 373 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 374 /* fix scope id for comparing SPD */ 375 sin6->sin6_addr.s6_addr16[1] = 0; 376 sin6->sin6_scope_id = 377 ntohs(ip6->ip6_src.s6_addr16[1]); 378 } 379 } 380 if (saidx->dst.sin6.sin6_len == 0) { 381 sin6 = (struct sockaddr_in6 *)&saidx->dst; 382 sin6->sin6_len = sizeof(*sin6); 383 sin6->sin6_family = AF_INET6; 384 sin6->sin6_port = IPSEC_PORT_ANY; 385 sin6->sin6_addr = ip6->ip6_dst; 386 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 387 /* fix scope id for comparing SPD */ 388 sin6->sin6_addr.s6_addr16[1] = 0; 389 sin6->sin6_scope_id = 390 ntohs(ip6->ip6_dst.s6_addr16[1]); 391 } 392 } 393 } 394 } 395 396 /* 397 * Lookup SA and validate it. 398 */ 399 *error = key_checkrequest(isr, saidx); 400 if (*error != 0) { 401 /* 402 * IPsec processing is required, but no SA found. 403 * I assume that key_acquire() had been called 404 * to get/establish the SA. Here I discard 405 * this packet because it is responsibility for 406 * upper layer to retransmit the packet. 407 */ 408 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 409 goto bad; 410 } 411 sav = isr->sav; 412 /* sav may be NULL here if we have an USE rule */ 413 if (sav == NULL) { 414 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 415 ("ipsec_nextisr: no SA found, but required; level %u", 416 ipsec_get_reqlevel(isr))); 417 isr = isr->next; 418 /* 419 * No more rules to apply, return NULL isr and no error 420 * It can happen when the last rules are USE rules 421 * */ 422 if (isr == NULL) { 423 *error = 0; 424 return isr; 425 } 426 goto again; 427 } 428 429 /* 430 * Check system global policy controls. 431 */ 432 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 433 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 434 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 435 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 436 " to policy (check your sysctls)\n")); 437 IPSEC_OSTAT(ESP_STAT_PDROPS, AH_STAT_PDROPS, 438 IPCOMP_STAT_PDROPS); 439 *error = EHOSTUNREACH; 440 goto bad; 441 } 442 443 /* 444 * Sanity check the SA contents for the caller 445 * before they invoke the xform output method. 446 */ 447 if (sav->tdb_xform == NULL) { 448 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 449 IPSEC_OSTAT(ESP_STAT_NOXFORM, AH_STAT_NOXFORM, 450 IPCOMP_STAT_NOXFORM); 451 *error = EHOSTUNREACH; 452 goto bad; 453 } 454 return isr; 455 bad: 456 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 457 return NULL; 458 #undef IPSEC_OSTAT 459 } 460 461 #ifdef INET 462 /* 463 * IPsec output logic for IPv4. 464 */ 465 int 466 ipsec4_process_packet( 467 struct mbuf *m, 468 struct ipsecrequest *isr, 469 int flags, 470 int tunalready 471 ) 472 { 473 struct secasindex saidx; 474 struct secasvar *sav; 475 struct ip *ip; 476 int s, error, i, off; 477 478 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 479 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 480 481 s = splsoftnet(); /* insure SA contents don't change */ 482 483 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 484 if (isr == NULL) { 485 if (error != 0) { 486 goto bad; 487 } else { 488 if (ipsec_register_done(m, &error) < 0) 489 goto bad; 490 491 splx(s); 492 return ipsec_reinject_ipstack(m, AF_INET); 493 } 494 } 495 496 sav = isr->sav; 497 if (!tunalready) { 498 union sockaddr_union *dst = &sav->sah->saidx.dst; 499 int setdf; 500 501 /* 502 * Collect IP_DF state from the outer header. 503 */ 504 if (dst->sa.sa_family == AF_INET) { 505 if (m->m_len < sizeof (struct ip) && 506 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 507 error = ENOBUFS; 508 goto bad; 509 } 510 ip = mtod(m, struct ip *); 511 /* Honor system-wide control of how to handle IP_DF */ 512 switch (ip4_ipsec_dfbit) { 513 case 0: /* clear in outer header */ 514 case 1: /* set in outer header */ 515 setdf = ip4_ipsec_dfbit; 516 break; 517 default: /* propagate to outer header */ 518 setdf = ip->ip_off; 519 #ifndef __FreeBSD__ 520 /* On FreeBSD, ip_off and ip_len assumed in host endian. */ 521 setdf = ntohs(setdf); 522 #endif 523 setdf = htons(setdf & IP_DF); 524 break; 525 } 526 } else { 527 ip = NULL; /* keep compiler happy */ 528 setdf = 0; 529 } 530 /* Do the appropriate encapsulation, if necessary */ 531 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 532 dst->sa.sa_family != AF_INET || /* PF mismatch */ 533 #if 0 534 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 535 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 536 #endif 537 (dst->sa.sa_family == AF_INET && /* Proxy */ 538 dst->sin.sin_addr.s_addr != INADDR_ANY && 539 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 540 struct mbuf *mp; 541 542 /* Fix IPv4 header checksum and length */ 543 if (m->m_len < sizeof (struct ip) && 544 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 545 error = ENOBUFS; 546 goto bad; 547 } 548 ip = mtod(m, struct ip *); 549 ip->ip_len = htons(m->m_pkthdr.len); 550 ip->ip_sum = 0; 551 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 552 553 /* Encapsulate the packet */ 554 error = ipip_output(m, isr, &mp, 0, 0); 555 if (mp == NULL && !error) { 556 /* Should never happen. */ 557 DPRINTF(("ipsec4_process_packet: ipip_output " 558 "returns no mbuf and no error!")); 559 error = EFAULT; 560 } 561 if (error) { 562 if (mp) { 563 /* XXX: Should never happen! */ 564 m_freem(mp); 565 } 566 m = NULL; /* ipip_output() already freed it */ 567 goto bad; 568 } 569 m = mp, mp = NULL; 570 /* 571 * ipip_output clears IP_DF in the new header. If 572 * we need to propagate IP_DF from the outer header, 573 * then we have to do it here. 574 * 575 * XXX shouldn't assume what ipip_output does. 576 */ 577 if (dst->sa.sa_family == AF_INET && setdf) { 578 if (m->m_len < sizeof (struct ip) && 579 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 580 error = ENOBUFS; 581 goto bad; 582 } 583 ip = mtod(m, struct ip *); 584 ip->ip_off |= IP_OFF_CONVERT(IP_DF); 585 } 586 } 587 } 588 589 /* 590 * Dispatch to the appropriate IPsec transform logic. The 591 * packet will be returned for transmission after crypto 592 * processing, etc. are completed. For encapsulation we 593 * bypass this call because of the explicit call done above 594 * (necessary to deal with IP_DF handling for IPv4). 595 * 596 * NB: m & sav are ``passed to caller'' who's reponsible for 597 * for reclaiming their resources. 598 */ 599 if (sav->tdb_xform->xf_type != XF_IP4) { 600 ip = mtod(m, struct ip *); 601 i = ip->ip_hl << 2; 602 off = offsetof(struct ip, ip_p); 603 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 604 } else { 605 error = ipsec_process_done(m, isr); 606 } 607 splx(s); 608 return error; 609 bad: 610 splx(s); 611 if (m) 612 m_freem(m); 613 return error; 614 } 615 #endif 616 617 #ifdef INET6 618 int 619 ipsec6_process_packet( 620 struct mbuf *m, 621 struct ipsecrequest *isr 622 ) 623 { 624 struct secasindex saidx; 625 struct secasvar *sav; 626 struct ip6_hdr *ip6; 627 int s, error, i, off; 628 629 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 630 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 631 632 s = splsoftnet(); /* insure SA contents don't change */ 633 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 634 if (isr == NULL) { 635 if (error != 0) { 636 // XXX Should we send a notification ? 637 goto bad; 638 } else { 639 if (ipsec_register_done(m, &error) < 0) 640 goto bad; 641 642 splx(s); 643 return ipsec_reinject_ipstack(m, AF_INET6); 644 } 645 } 646 647 sav = isr->sav; 648 if (sav->tdb_xform->xf_type != XF_IP4) { 649 i = sizeof(struct ip6_hdr); 650 off = offsetof(struct ip6_hdr, ip6_nxt); 651 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 652 } else { 653 union sockaddr_union *dst = &sav->sah->saidx.dst; 654 655 ip6 = mtod(m, struct ip6_hdr *); 656 657 /* Do the appropriate encapsulation, if necessary */ 658 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 659 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 660 ((dst->sa.sa_family == AF_INET6) && 661 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 662 (!IN6_ARE_ADDR_EQUAL(&dst->sin6.sin6_addr, 663 &ip6->ip6_dst))) 664 ) 665 { 666 struct mbuf *mp; 667 /* Fix IPv6 header payload length. */ 668 if (m->m_len < sizeof(struct ip6_hdr)) 669 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 670 return ENOBUFS; 671 672 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 673 /* No jumbogram support. */ 674 m_freem(m); 675 return ENXIO; /*XXX*/ 676 } 677 ip6 = mtod(m, struct ip6_hdr *); 678 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 679 680 /* Encapsulate the packet */ 681 error = ipip_output(m, isr, &mp, 0, 0); 682 if (mp == NULL && !error) { 683 /* Should never happen. */ 684 DPRINTF(("ipsec6_process_packet: ipip_output " 685 "returns no mbuf and no error!")); 686 error = EFAULT; 687 } 688 689 if (error) { 690 if (mp) { 691 /* XXX: Should never happen! */ 692 m_freem(mp); 693 } 694 m = NULL; /* ipip_output() already freed it */ 695 goto bad; 696 } 697 698 m = mp; 699 mp = NULL; 700 } 701 702 error = ipsec_process_done(m,isr); 703 } 704 splx(s); 705 return error; 706 bad: 707 splx(s); 708 if (m) 709 m_freem(m); 710 return error; 711 } 712 #endif /*INET6*/
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