ipsec_output.c revision 117056
1/*- 2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/netipsec/ipsec_output.c 117056 2003-06-30 05:05:19Z sam $ 27 */ 28 29/* 30 * IPsec output processing. 31 */ 32#include "opt_inet.h" 33#include "opt_inet6.h" 34#include "opt_ipsec.h" 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/mbuf.h> 39#include <sys/domain.h> 40#include <sys/protosw.h> 41#include <sys/socket.h> 42#include <sys/errno.h> 43#include <sys/syslog.h> 44 45#include <net/if.h> 46#include <net/route.h> 47 48#include <netinet/in.h> 49#include <netinet/in_systm.h> 50#include <netinet/ip.h> 51#include <netinet/ip_var.h> 52#include <netinet/in_var.h> 53#include <netinet/ip_ecn.h> 54#ifdef INET6 55#include <netinet6/ip6_ecn.h> 56#endif 57 58#include <netinet/ip6.h> 59#ifdef INET6 60#include <netinet6/ip6_var.h> 61#endif 62#include <netinet/in_pcb.h> 63#ifdef INET6 64#include <netinet/icmp6.h> 65#endif 66 67#include <netipsec/ipsec.h> 68#ifdef INET6 69#include <netipsec/ipsec6.h> 70#endif 71#include <netipsec/ah_var.h> 72#include <netipsec/esp_var.h> 73#include <netipsec/ipcomp_var.h> 74 75#include <netipsec/xform.h> 76 77#include <netipsec/key.h> 78#include <netipsec/keydb.h> 79#include <netipsec/key_debug.h> 80 81#include <machine/in_cksum.h> 82 83int 84ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 85{ 86 struct tdb_ident *tdbi; 87 struct m_tag *mtag; 88 struct secasvar *sav; 89 struct secasindex *saidx; 90 int error; 91 92#if 0 93 SPLASSERT(net, "ipsec_process_done"); 94#endif 95 96 KASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 97 KASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 98 sav = isr->sav; 99 KASSERT(sav != NULL, ("ipsec_process_done: null SA")); 100 KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 101 102 saidx = &sav->sah->saidx; 103 switch (saidx->dst.sa.sa_family) { 104#ifdef INET 105 case AF_INET: 106 /* Fix the header length, for AH processing. */ 107 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 108 break; 109#endif /* INET */ 110#ifdef INET6 111 case AF_INET6: 112 /* Fix the header length, for AH processing. */ 113 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 114 error = ENXIO; 115 goto bad; 116 } 117 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 118 /* No jumbogram support. */ 119 error = ENXIO; /*?*/ 120 goto bad; 121 } 122 mtod(m, struct ip6_hdr *)->ip6_plen = 123 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 124 break; 125#endif /* INET6 */ 126 default: 127 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 128 saidx->dst.sa.sa_family)); 129 error = ENXIO; 130 goto bad; 131 } 132 133 /* 134 * Add a record of what we've done or what needs to be done to the 135 * packet. 136 */ 137 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 138 sizeof(struct tdb_ident), M_NOWAIT); 139 if (mtag == NULL) { 140 DPRINTF(("ipsec_process_done: could not get packet tag\n")); 141 error = ENOMEM; 142 goto bad; 143 } 144 145 tdbi = (struct tdb_ident *)(mtag + 1); 146 tdbi->dst = saidx->dst; 147 tdbi->proto = saidx->proto; 148 tdbi->spi = sav->spi; 149 m_tag_prepend(m, mtag); 150 151 /* 152 * If there's another (bundled) SA to apply, do so. 153 * Note that this puts a burden on the kernel stack size. 154 * If this is a problem we'll need to introduce a queue 155 * to set the packet on so we can unwind the stack before 156 * doing further processing. 157 */ 158 if (isr->next) { 159 newipsecstat.ips_out_bundlesa++; 160 return ipsec4_process_packet(m, isr->next, 0, 0); 161 } 162 key_sa_recordxfer(sav, m); /* record data transfer */ 163 164 /* 165 * We're done with IPsec processing, transmit the packet using the 166 * appropriate network protocol (IP or IPv6). SPD lookup will be 167 * performed again there. 168 */ 169 switch (saidx->dst.sa.sa_family) { 170#ifdef INET 171 struct ip *ip; 172 case AF_INET: 173 ip = mtod(m, struct ip *); 174 ip->ip_len = ntohs(ip->ip_len); 175 ip->ip_off = ntohs(ip->ip_off); 176 177 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 178#endif /* INET */ 179#ifdef INET6 180 case AF_INET6: 181 /* 182 * We don't need massage, IPv6 header fields are always in 183 * net endian. 184 */ 185 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 186#endif /* INET6 */ 187 } 188 panic("ipsec_process_done"); 189bad: 190 m_freem(m); 191 KEY_FREESAV(&sav); 192 return (error); 193} 194 195static struct ipsecrequest * 196ipsec_nextisr( 197 struct mbuf *m, 198 struct ipsecrequest *isr, 199 int af, 200 struct secasindex *saidx, 201 int *error 202) 203{ 204#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 205 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 206 struct secasvar *sav; 207 208#if 0 209 SPLASSERT(net, "ipsec_nextisr"); 210#endif 211 KASSERT(af == AF_INET || af == AF_INET6, 212 ("ipsec_nextisr: invalid address family %u", af)); 213again: 214 /* 215 * Craft SA index to search for proper SA. Note that 216 * we only fillin unspecified SA peers for transport 217 * mode; for tunnel mode they must already be filled in. 218 */ 219 *saidx = isr->saidx; 220 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 221 /* Fillin unspecified SA peers only for transport mode */ 222 if (af == AF_INET) { 223 struct sockaddr_in *sin; 224 struct ip *ip = mtod(m, struct ip *); 225 226 if (saidx->src.sa.sa_len == 0) { 227 sin = &saidx->src.sin; 228 sin->sin_len = sizeof(*sin); 229 sin->sin_family = AF_INET; 230 sin->sin_port = IPSEC_PORT_ANY; 231 sin->sin_addr = ip->ip_src; 232 } 233 if (saidx->dst.sa.sa_len == 0) { 234 sin = &saidx->dst.sin; 235 sin->sin_len = sizeof(*sin); 236 sin->sin_family = AF_INET; 237 sin->sin_port = IPSEC_PORT_ANY; 238 sin->sin_addr = ip->ip_dst; 239 } 240 } else { 241 struct sockaddr_in6 *sin6; 242 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 243 244 if (saidx->src.sin6.sin6_len == 0) { 245 sin6 = (struct sockaddr_in6 *)&saidx->src; 246 sin6->sin6_len = sizeof(*sin6); 247 sin6->sin6_family = AF_INET6; 248 sin6->sin6_port = IPSEC_PORT_ANY; 249 sin6->sin6_addr = ip6->ip6_src; 250 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 251 /* fix scope id for comparing SPD */ 252 sin6->sin6_addr.s6_addr16[1] = 0; 253 sin6->sin6_scope_id = 254 ntohs(ip6->ip6_src.s6_addr16[1]); 255 } 256 } 257 if (saidx->dst.sin6.sin6_len == 0) { 258 sin6 = (struct sockaddr_in6 *)&saidx->dst; 259 sin6->sin6_len = sizeof(*sin6); 260 sin6->sin6_family = AF_INET6; 261 sin6->sin6_port = IPSEC_PORT_ANY; 262 sin6->sin6_addr = ip6->ip6_dst; 263 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 264 /* fix scope id for comparing SPD */ 265 sin6->sin6_addr.s6_addr16[1] = 0; 266 sin6->sin6_scope_id = 267 ntohs(ip6->ip6_dst.s6_addr16[1]); 268 } 269 } 270 } 271 } 272 273 /* 274 * Lookup SA and validate it. 275 */ 276 *error = key_checkrequest(isr, saidx); 277 if (*error != 0) { 278 /* 279 * IPsec processing is required, but no SA found. 280 * I assume that key_acquire() had been called 281 * to get/establish the SA. Here I discard 282 * this packet because it is responsibility for 283 * upper layer to retransmit the packet. 284 */ 285 newipsecstat.ips_out_nosa++; 286 goto bad; 287 } 288 sav = isr->sav; 289 if (sav == NULL) { /* XXX valid return */ 290 KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 291 ("ipsec_nextisr: no SA found, but required; level %u", 292 ipsec_get_reqlevel(isr))); 293 isr = isr->next; 294 if (isr == NULL) { 295 /*XXXstatistic??*/ 296 *error = EINVAL; /*XXX*/ 297 return isr; 298 } 299 goto again; 300 } 301 302 /* 303 * Check system global policy controls. 304 */ 305 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 306 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 307 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 308 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 309 " to policy (check your sysctls)\n")); 310 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 311 ipcompstat.ipcomps_pdrops); 312 *error = EHOSTUNREACH; 313 goto bad; 314 } 315 316 /* 317 * Sanity check the SA contents for the caller 318 * before they invoke the xform output method. 319 */ 320 if (sav->tdb_xform == NULL) { 321 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 322 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 323 ipcompstat.ipcomps_noxform); 324 *error = EHOSTUNREACH; 325 goto bad; 326 } 327 return isr; 328bad: 329 KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 330 return NULL; 331#undef IPSEC_OSTAT 332} 333 334#ifdef INET 335/* 336 * IPsec output logic for IPv4. 337 */ 338int 339ipsec4_process_packet( 340 struct mbuf *m, 341 struct ipsecrequest *isr, 342 int flags, 343 int tunalready) 344{ 345 struct secasindex saidx; 346 struct secasvar *sav; 347 struct ip *ip; 348 int s, error, i, off; 349 350 KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 351 KASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 352 353 s = splnet(); /* insure SA contents don't change */ 354 355 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 356 if (isr == NULL) 357 goto bad; 358 359 sav = isr->sav; 360 if (!tunalready) { 361 union sockaddr_union *dst = &sav->sah->saidx.dst; 362 int setdf; 363 364 /* 365 * Collect IP_DF state from the outer header. 366 */ 367 if (dst->sa.sa_family == AF_INET) { 368 if (m->m_len < sizeof (struct ip) && 369 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 370 error = ENOBUFS; 371 goto bad; 372 } 373 ip = mtod(m, struct ip *); 374 /* Honor system-wide control of how to handle IP_DF */ 375 switch (ip4_ipsec_dfbit) { 376 case 0: /* clear in outer header */ 377 case 1: /* set in outer header */ 378 setdf = ip4_ipsec_dfbit; 379 break; 380 default: /* propagate to outer header */ 381 setdf = ntohs(ip->ip_off & IP_DF); 382 break; 383 } 384 } else { 385 ip = NULL; /* keep compiler happy */ 386 setdf = 0; 387 } 388 /* Do the appropriate encapsulation, if necessary */ 389 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 390 dst->sa.sa_family != AF_INET || /* PF mismatch */ 391#if 0 392 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 393 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 394#endif 395 (dst->sa.sa_family == AF_INET && /* Proxy */ 396 dst->sin.sin_addr.s_addr != INADDR_ANY && 397 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 398 struct mbuf *mp; 399 400 /* Fix IPv4 header checksum and length */ 401 if (m->m_len < sizeof (struct ip) && 402 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 403 error = ENOBUFS; 404 goto bad; 405 } 406 ip = mtod(m, struct ip *); 407 ip->ip_len = htons(m->m_pkthdr.len); 408 ip->ip_sum = 0; 409#ifdef _IP_VHL 410 if (ip->ip_vhl == IP_VHL_BORING) 411 ip->ip_sum = in_cksum_hdr(ip); 412 else 413 ip->ip_sum = in_cksum(m, 414 _IP_VHL_HL(ip->ip_vhl) << 2); 415#else 416 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 417#endif 418 419 /* Encapsulate the packet */ 420 error = ipip_output(m, isr, &mp, 0, 0); 421 if (mp == NULL && !error) { 422 /* Should never happen. */ 423 DPRINTF(("ipsec4_process_packet: ipip_output " 424 "returns no mbuf and no error!")); 425 error = EFAULT; 426 } 427 if (error) { 428 if (mp) 429 m_freem(mp); 430 goto bad; 431 } 432 m = mp, mp = NULL; 433 /* 434 * ipip_output clears IP_DF in the new header. If 435 * we need to propagate IP_DF from the outer header, 436 * then we have to do it here. 437 * 438 * XXX shouldn't assume what ipip_output does. 439 */ 440 if (dst->sa.sa_family == AF_INET && setdf) { 441 if (m->m_len < sizeof (struct ip) && 442 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 443 error = ENOBUFS; 444 goto bad; 445 } 446 ip = mtod(m, struct ip *); 447 ip->ip_off = ntohs(ip->ip_off); 448 ip->ip_off |= IP_DF; 449 ip->ip_off = htons(ip->ip_off); 450 } 451 } 452 } 453 454 /* 455 * Dispatch to the appropriate IPsec transform logic. The 456 * packet will be returned for transmission after crypto 457 * processing, etc. are completed. For encapsulation we 458 * bypass this call because of the explicit call done above 459 * (necessary to deal with IP_DF handling for IPv4). 460 * 461 * NB: m & sav are ``passed to caller'' who's reponsible for 462 * for reclaiming their resources. 463 */ 464 if (sav->tdb_xform->xf_type != XF_IP4) { 465 ip = mtod(m, struct ip *); 466 i = ip->ip_hl << 2; 467 off = offsetof(struct ip, ip_p); 468 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 469 } else { 470 error = ipsec_process_done(m, isr); 471 } 472 splx(s); 473 return error; 474bad: 475 splx(s); 476 if (m) 477 m_freem(m); 478 return error; 479} 480#endif 481 482#ifdef INET6 483/* 484 * Chop IP6 header from the payload. 485 */ 486static struct mbuf * 487ipsec6_splithdr(struct mbuf *m) 488{ 489 struct mbuf *mh; 490 struct ip6_hdr *ip6; 491 int hlen; 492 493 KASSERT(m->m_len >= sizeof (struct ip6_hdr), 494 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len)); 495 ip6 = mtod(m, struct ip6_hdr *); 496 hlen = sizeof(struct ip6_hdr); 497 if (m->m_len > hlen) { 498 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 499 if (!mh) { 500 m_freem(m); 501 return NULL; 502 } 503 M_MOVE_PKTHDR(mh, m); 504 MH_ALIGN(mh, hlen); 505 m->m_len -= hlen; 506 m->m_data += hlen; 507 mh->m_next = m; 508 m = mh; 509 m->m_len = hlen; 510 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 511 } else if (m->m_len < hlen) { 512 m = m_pullup(m, hlen); 513 if (!m) 514 return NULL; 515 } 516 return m; 517} 518 519/* 520 * IPsec output logic for IPv6, transport mode. 521 */ 522int 523ipsec6_output_trans( 524 struct ipsec_output_state *state, 525 u_char *nexthdrp, 526 struct mbuf *mprev, 527 struct secpolicy *sp, 528 int flags, 529 int *tun) 530{ 531 struct ipsecrequest *isr; 532 struct secasindex saidx; 533 int error = 0; 534 struct mbuf *m; 535 536 KASSERT(state != NULL, ("ipsec6_output: null state")); 537 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 538 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp")); 539 KASSERT(mprev != NULL, ("ipsec6_output: null mprev")); 540 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 541 KASSERT(tun != NULL, ("ipsec6_output: null tun")); 542 543 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 544 printf("ipsec6_output_trans: applyed SP\n"); 545 kdebug_secpolicy(sp)); 546 547 isr = sp->req; 548 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 549 /* the rest will be handled by ipsec6_output_tunnel() */ 550 *tun = 1; /* need tunnel-mode processing */ 551 return 0; 552 } 553 554 *tun = 0; 555 m = state->m; 556 557 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 558 if (isr == NULL) { 559#ifdef notdef 560 /* XXX should notification be done for all errors ? */ 561 /* 562 * Notify the fact that the packet is discarded 563 * to ourselves. I believe this is better than 564 * just silently discarding. (jinmei@kame.net) 565 * XXX: should we restrict the error to TCP packets? 566 * XXX: should we directly notify sockets via 567 * pfctlinputs? 568 */ 569 icmp6_error(m, ICMP6_DST_UNREACH, 570 ICMP6_DST_UNREACH_ADMIN, 0); 571 m = NULL; /* NB: icmp6_error frees mbuf */ 572#endif 573 goto bad; 574 } 575 576 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 577 sizeof (struct ip6_hdr), 578 offsetof(struct ip6_hdr, ip6_nxt)); 579bad: 580 if (m) 581 m_freem(m); 582 state->m = NULL; 583 return error; 584} 585 586static int 587ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 588{ 589 struct ip6_hdr *oip6; 590 struct ip6_hdr *ip6; 591 size_t plen; 592 593 /* can't tunnel between different AFs */ 594 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 595 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 596 m_freem(m); 597 return EINVAL; 598 } 599 KASSERT(m->m_len != sizeof (struct ip6_hdr), 600 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len)); 601 602 603 /* 604 * grow the mbuf to accomodate the new IPv6 header. 605 */ 606 plen = m->m_pkthdr.len; 607 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 608 struct mbuf *n; 609 MGET(n, M_DONTWAIT, MT_DATA); 610 if (!n) { 611 m_freem(m); 612 return ENOBUFS; 613 } 614 n->m_len = sizeof(struct ip6_hdr); 615 n->m_next = m->m_next; 616 m->m_next = n; 617 m->m_pkthdr.len += sizeof(struct ip6_hdr); 618 oip6 = mtod(n, struct ip6_hdr *); 619 } else { 620 m->m_next->m_len += sizeof(struct ip6_hdr); 621 m->m_next->m_data -= sizeof(struct ip6_hdr); 622 m->m_pkthdr.len += sizeof(struct ip6_hdr); 623 oip6 = mtod(m->m_next, struct ip6_hdr *); 624 } 625 ip6 = mtod(m, struct ip6_hdr *); 626 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 627 628 /* Fake link-local scope-class addresses */ 629 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 630 oip6->ip6_src.s6_addr16[1] = 0; 631 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 632 oip6->ip6_dst.s6_addr16[1] = 0; 633 634 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 635 /* ECN consideration. */ 636 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 637 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 638 ip6->ip6_plen = htons(plen); 639 else { 640 /* ip6->ip6_plen will be updated in ip6_output() */ 641 } 642 ip6->ip6_nxt = IPPROTO_IPV6; 643 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 644 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 645 ip6->ip6_hlim = IPV6_DEFHLIM; 646 647 /* XXX Should ip6_src be updated later ? */ 648 649 return 0; 650} 651 652/* 653 * IPsec output logic for IPv6, tunnel mode. 654 */ 655int 656ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 657{ 658 struct ip6_hdr *ip6; 659 struct ipsecrequest *isr; 660 struct secasindex saidx; 661 int error; 662 struct sockaddr_in6* dst6; 663 struct mbuf *m; 664 665 KASSERT(state != NULL, ("ipsec6_output: null state")); 666 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 667 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 668 669 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 670 printf("ipsec6_output_tunnel: applyed SP\n"); 671 kdebug_secpolicy(sp)); 672 673 m = state->m; 674 /* 675 * transport mode ipsec (before the 1st tunnel mode) is already 676 * processed by ipsec6_output_trans(). 677 */ 678 for (isr = sp->req; isr; isr = isr->next) { 679 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 680 break; 681 } 682 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 683 if (isr == NULL) 684 goto bad; 685 686 /* 687 * There may be the case that SA status will be changed when 688 * we are refering to one. So calling splsoftnet(). 689 */ 690 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 691 /* 692 * build IPsec tunnel. 693 */ 694 /* XXX should be processed with other familiy */ 695 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 696 ipseclog((LOG_ERR, "ipsec6_output_tunnel: " 697 "family mismatched between inner and outer, spi=%u\n", 698 ntohl(isr->sav->spi))); 699 newipsecstat.ips_out_inval++; 700 error = EAFNOSUPPORT; 701 goto bad; 702 } 703 704 m = ipsec6_splithdr(m); 705 if (!m) { 706 newipsecstat.ips_out_nomem++; 707 error = ENOMEM; 708 goto bad; 709 } 710 error = ipsec6_encapsulate(m, isr->sav); 711 if (error) { 712 m = NULL; 713 goto bad; 714 } 715 ip6 = mtod(m, struct ip6_hdr *); 716 717 state->ro = &isr->sav->sah->sa_route; 718 state->dst = (struct sockaddr *)&state->ro->ro_dst; 719 dst6 = (struct sockaddr_in6 *)state->dst; 720 if (state->ro->ro_rt 721 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 722 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 723 RTFREE(state->ro->ro_rt); 724 state->ro->ro_rt = NULL; 725 } 726 if (state->ro->ro_rt == 0) { 727 bzero(dst6, sizeof(*dst6)); 728 dst6->sin6_family = AF_INET6; 729 dst6->sin6_len = sizeof(*dst6); 730 dst6->sin6_addr = ip6->ip6_dst; 731 rtalloc(state->ro); 732 } 733 if (state->ro->ro_rt == 0) { 734 ip6stat.ip6s_noroute++; 735 newipsecstat.ips_out_noroute++; 736 error = EHOSTUNREACH; 737 goto bad; 738 } 739 740 /* adjust state->dst if tunnel endpoint is offlink */ 741 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 742 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 743 dst6 = (struct sockaddr_in6 *)state->dst; 744 } 745 } 746 747 m = ipsec6_splithdr(m); 748 if (!m) { 749 newipsecstat.ips_out_nomem++; 750 error = ENOMEM; 751 goto bad; 752 } 753 ip6 = mtod(m, struct ip6_hdr *); 754 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 755 sizeof (struct ip6_hdr), 756 offsetof(struct ip6_hdr, ip6_nxt)); 757bad: 758 if (m) 759 m_freem(m); 760 state->m = NULL; 761 return error; 762} 763#endif /*INET6*/ 764