ipsec_output.c revision 170122
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 170122 2007-05-29 22:34:58Z bz $ 27 */ 28 29/* 30 * IPsec output processing. 31 */ 32#include "opt_inet.h" 33#include "opt_inet6.h" 34#include "opt_ipsec.h" 35#include "opt_enc.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/mbuf.h> 40#include <sys/domain.h> 41#include <sys/protosw.h> 42#include <sys/socket.h> 43#include <sys/errno.h> 44#include <sys/syslog.h> 45 46#include <net/if.h> 47#include <net/route.h> 48 49#include <netinet/in.h> 50#include <netinet/in_systm.h> 51#include <netinet/ip.h> 52#include <netinet/ip_var.h> 53#include <netinet/in_var.h> 54#include <netinet/ip_ecn.h> 55#ifdef INET6 56#include <netinet6/ip6_ecn.h> 57#endif 58 59#include <netinet/ip6.h> 60#ifdef INET6 61#include <netinet6/ip6_var.h> 62#endif 63#include <netinet/in_pcb.h> 64#ifdef INET6 65#include <netinet/icmp6.h> 66#endif 67 68#include <netipsec/ipsec.h> 69#ifdef INET6 70#include <netipsec/ipsec6.h> 71#endif 72#include <netipsec/ah_var.h> 73#include <netipsec/esp_var.h> 74#include <netipsec/ipcomp_var.h> 75 76#include <netipsec/xform.h> 77 78#include <netipsec/key.h> 79#include <netipsec/keydb.h> 80#include <netipsec/key_debug.h> 81 82#include <machine/in_cksum.h> 83 84int 85ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 86{ 87 struct tdb_ident *tdbi; 88 struct m_tag *mtag; 89 struct secasvar *sav; 90 struct secasindex *saidx; 91 int error; 92 93 IPSEC_SPLASSERT_SOFTNET(__func__); 94 95 IPSEC_ASSERT(m != NULL, ("null mbuf")); 96 IPSEC_ASSERT(isr != NULL, ("null ISR")); 97 sav = isr->sav; 98 IPSEC_ASSERT(sav != NULL, ("null SA")); 99 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 100 101 saidx = &sav->sah->saidx; 102 switch (saidx->dst.sa.sa_family) { 103#ifdef INET 104 case AF_INET: 105 /* Fix the header length, for AH processing. */ 106 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 107 break; 108#endif /* INET */ 109#ifdef INET6 110 case AF_INET6: 111 /* Fix the header length, for AH processing. */ 112 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 113 error = ENXIO; 114 goto bad; 115 } 116 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 117 /* No jumbogram support. */ 118 error = ENXIO; /*?*/ 119 goto bad; 120 } 121 mtod(m, struct ip6_hdr *)->ip6_plen = 122 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 123 break; 124#endif /* INET6 */ 125 default: 126 DPRINTF(("%s: unknown protocol family %u\n", __func__, 127 saidx->dst.sa.sa_family)); 128 error = ENXIO; 129 goto bad; 130 } 131 132 /* 133 * Add a record of what we've done or what needs to be done to the 134 * packet. 135 */ 136 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 137 sizeof(struct tdb_ident), M_NOWAIT); 138 if (mtag == NULL) { 139 DPRINTF(("%s: could not get packet tag\n", __func__)); 140 error = ENOMEM; 141 goto bad; 142 } 143 144 tdbi = (struct tdb_ident *)(mtag + 1); 145 tdbi->dst = saidx->dst; 146 tdbi->proto = saidx->proto; 147 tdbi->spi = sav->spi; 148 m_tag_prepend(m, mtag); 149 150 /* 151 * If there's another (bundled) SA to apply, do so. 152 * Note that this puts a burden on the kernel stack size. 153 * If this is a problem we'll need to introduce a queue 154 * to set the packet on so we can unwind the stack before 155 * doing further processing. 156 */ 157 if (isr->next) { 158 newipsecstat.ips_out_bundlesa++; 159 return ipsec4_process_packet(m, isr->next, 0, 0); 160 } 161 key_sa_recordxfer(sav, m); /* record data transfer */ 162 163 /* 164 * We're done with IPsec processing, transmit the packet using the 165 * appropriate network protocol (IP or IPv6). SPD lookup will be 166 * performed again there. 167 */ 168 switch (saidx->dst.sa.sa_family) { 169#ifdef INET 170 struct ip *ip; 171 case AF_INET: 172 ip = mtod(m, struct ip *); 173 ip->ip_len = ntohs(ip->ip_len); 174 ip->ip_off = ntohs(ip->ip_off); 175 176 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 177#endif /* INET */ 178#ifdef INET6 179 case AF_INET6: 180 /* 181 * We don't need massage, IPv6 header fields are always in 182 * net endian. 183 */ 184 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 185#endif /* INET6 */ 186 } 187 panic("ipsec_process_done"); 188bad: 189 m_freem(m); 190 KEY_FREESAV(&sav); 191 return (error); 192} 193 194static struct ipsecrequest * 195ipsec_nextisr( 196 struct mbuf *m, 197 struct ipsecrequest *isr, 198 int af, 199 struct secasindex *saidx, 200 int *error 201) 202{ 203#define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 204 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 205 struct secasvar *sav; 206 207 IPSEC_SPLASSERT_SOFTNET(__func__); 208 IPSECREQUEST_LOCK_ASSERT(isr); 209 210 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 211 ("invalid address family %u", af)); 212again: 213 /* 214 * Craft SA index to search for proper SA. Note that 215 * we only fillin unspecified SA peers for transport 216 * mode; for tunnel mode they must already be filled in. 217 */ 218 *saidx = isr->saidx; 219 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 220 /* Fillin unspecified SA peers only for transport mode */ 221 if (af == AF_INET) { 222 struct sockaddr_in *sin; 223 struct ip *ip = mtod(m, struct ip *); 224 225 if (saidx->src.sa.sa_len == 0) { 226 sin = &saidx->src.sin; 227 sin->sin_len = sizeof(*sin); 228 sin->sin_family = AF_INET; 229 sin->sin_port = IPSEC_PORT_ANY; 230 sin->sin_addr = ip->ip_src; 231 } 232 if (saidx->dst.sa.sa_len == 0) { 233 sin = &saidx->dst.sin; 234 sin->sin_len = sizeof(*sin); 235 sin->sin_family = AF_INET; 236 sin->sin_port = IPSEC_PORT_ANY; 237 sin->sin_addr = ip->ip_dst; 238 } 239 } else { 240 struct sockaddr_in6 *sin6; 241 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 242 243 if (saidx->src.sin6.sin6_len == 0) { 244 sin6 = (struct sockaddr_in6 *)&saidx->src; 245 sin6->sin6_len = sizeof(*sin6); 246 sin6->sin6_family = AF_INET6; 247 sin6->sin6_port = IPSEC_PORT_ANY; 248 sin6->sin6_addr = ip6->ip6_src; 249 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 250 /* fix scope id for comparing SPD */ 251 sin6->sin6_addr.s6_addr16[1] = 0; 252 sin6->sin6_scope_id = 253 ntohs(ip6->ip6_src.s6_addr16[1]); 254 } 255 } 256 if (saidx->dst.sin6.sin6_len == 0) { 257 sin6 = (struct sockaddr_in6 *)&saidx->dst; 258 sin6->sin6_len = sizeof(*sin6); 259 sin6->sin6_family = AF_INET6; 260 sin6->sin6_port = IPSEC_PORT_ANY; 261 sin6->sin6_addr = ip6->ip6_dst; 262 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 263 /* fix scope id for comparing SPD */ 264 sin6->sin6_addr.s6_addr16[1] = 0; 265 sin6->sin6_scope_id = 266 ntohs(ip6->ip6_dst.s6_addr16[1]); 267 } 268 } 269 } 270 } 271 272 /* 273 * Lookup SA and validate it. 274 */ 275 *error = key_checkrequest(isr, saidx); 276 if (*error != 0) { 277 /* 278 * IPsec processing is required, but no SA found. 279 * I assume that key_acquire() had been called 280 * to get/establish the SA. Here I discard 281 * this packet because it is responsibility for 282 * upper layer to retransmit the packet. 283 */ 284 newipsecstat.ips_out_nosa++; 285 goto bad; 286 } 287 sav = isr->sav; 288 if (sav == NULL) { /* XXX valid return */ 289 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 290 ("no SA found, but required; level %u", 291 ipsec_get_reqlevel(isr))); 292 IPSECREQUEST_UNLOCK(isr); 293 isr = isr->next; 294 if (isr == NULL) { 295 /*XXXstatistic??*/ 296 *error = EINVAL; /*XXX*/ 297 return isr; 298 } 299 IPSECREQUEST_LOCK(isr); 300 goto again; 301 } 302 303 /* 304 * Check system global policy controls. 305 */ 306 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 307 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 308 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 309 DPRINTF(("%s: IPsec outbound packet dropped due" 310 " to policy (check your sysctls)\n", __func__)); 311 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 312 ipcompstat.ipcomps_pdrops); 313 *error = EHOSTUNREACH; 314 goto bad; 315 } 316 317 /* 318 * Sanity check the SA contents for the caller 319 * before they invoke the xform output method. 320 */ 321 if (sav->tdb_xform == NULL) { 322 DPRINTF(("%s: no transform for SA\n", __func__)); 323 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 324 ipcompstat.ipcomps_noxform); 325 *error = EHOSTUNREACH; 326 goto bad; 327 } 328 return isr; 329bad: 330 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 331 IPSECREQUEST_UNLOCK(isr); 332 return NULL; 333#undef IPSEC_OSTAT 334} 335 336#ifdef INET 337/* 338 * IPsec output logic for IPv4. 339 */ 340int 341ipsec4_process_packet( 342 struct mbuf *m, 343 struct ipsecrequest *isr, 344 int flags, 345 int tunalready) 346{ 347 struct secasindex saidx; 348 struct secasvar *sav; 349 struct ip *ip; 350 int error, i, off; 351 352 IPSEC_ASSERT(m != NULL, ("null mbuf")); 353 IPSEC_ASSERT(isr != NULL, ("null isr")); 354 355 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 356 357 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 358 if (isr == NULL) 359 goto bad; 360 361 sav = isr->sav; 362 363#ifdef DEV_ENC 364 /* pass the mbuf to enc0 for packet filtering */ 365 if ((error = ipsec_filter(&m, 2)) != 0) 366 goto bad; 367#endif 368 369 if (!tunalready) { 370 union sockaddr_union *dst = &sav->sah->saidx.dst; 371 int setdf; 372 373 /* 374 * Collect IP_DF state from the outer header. 375 */ 376 if (dst->sa.sa_family == AF_INET) { 377 if (m->m_len < sizeof (struct ip) && 378 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 379 error = ENOBUFS; 380 goto bad; 381 } 382 ip = mtod(m, struct ip *); 383 /* Honor system-wide control of how to handle IP_DF */ 384 switch (ip4_ipsec_dfbit) { 385 case 0: /* clear in outer header */ 386 case 1: /* set in outer header */ 387 setdf = ip4_ipsec_dfbit; 388 break; 389 default: /* propagate to outer header */ 390 setdf = ntohs(ip->ip_off & IP_DF); 391 break; 392 } 393 } else { 394 ip = NULL; /* keep compiler happy */ 395 setdf = 0; 396 } 397 /* Do the appropriate encapsulation, if necessary */ 398 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 399 dst->sa.sa_family != AF_INET || /* PF mismatch */ 400#if 0 401 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 402 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 403#endif 404 (dst->sa.sa_family == AF_INET && /* Proxy */ 405 dst->sin.sin_addr.s_addr != INADDR_ANY && 406 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 407 struct mbuf *mp; 408 409 /* Fix IPv4 header checksum and length */ 410 if (m->m_len < sizeof (struct ip) && 411 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 412 error = ENOBUFS; 413 goto bad; 414 } 415 ip = mtod(m, struct ip *); 416 ip->ip_len = htons(m->m_pkthdr.len); 417 ip->ip_sum = 0; 418#ifdef _IP_VHL 419 if (ip->ip_vhl == IP_VHL_BORING) 420 ip->ip_sum = in_cksum_hdr(ip); 421 else 422 ip->ip_sum = in_cksum(m, 423 _IP_VHL_HL(ip->ip_vhl) << 2); 424#else 425 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 426#endif 427 428 /* Encapsulate the packet */ 429 error = ipip_output(m, isr, &mp, 0, 0); 430 if (mp == NULL && !error) { 431 /* Should never happen. */ 432 DPRINTF(("%s: ipip_output returns no mbuf and " 433 "no error!", __func__)); 434 error = EFAULT; 435 } 436 if (error) { 437 if (mp) { 438 /* XXX: Should never happen! */ 439 m_freem(mp); 440 } 441 m = NULL; /* ipip_output() already freed it */ 442 goto bad; 443 } 444 m = mp, mp = NULL; 445 /* 446 * ipip_output clears IP_DF in the new header. If 447 * we need to propagate IP_DF from the outer header, 448 * then we have to do it here. 449 * 450 * XXX shouldn't assume what ipip_output does. 451 */ 452 if (dst->sa.sa_family == AF_INET && setdf) { 453 if (m->m_len < sizeof (struct ip) && 454 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 455 error = ENOBUFS; 456 goto bad; 457 } 458 ip = mtod(m, struct ip *); 459 ip->ip_off = ntohs(ip->ip_off); 460 ip->ip_off |= IP_DF; 461 ip->ip_off = htons(ip->ip_off); 462 } 463 } 464 } 465 466#ifdef DEV_ENC 467 /* pass the mbuf to enc0 for bpf processing */ 468 ipsec_bpf(m, sav, AF_INET); 469#endif 470 471 /* 472 * Dispatch to the appropriate IPsec transform logic. The 473 * packet will be returned for transmission after crypto 474 * processing, etc. are completed. For encapsulation we 475 * bypass this call because of the explicit call done above 476 * (necessary to deal with IP_DF handling for IPv4). 477 * 478 * NB: m & sav are ``passed to caller'' who's reponsible for 479 * for reclaiming their resources. 480 */ 481 if (sav->tdb_xform->xf_type != XF_IP4) { 482 ip = mtod(m, struct ip *); 483 i = ip->ip_hl << 2; 484 off = offsetof(struct ip, ip_p); 485 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 486 } else { 487 error = ipsec_process_done(m, isr); 488 } 489 IPSECREQUEST_UNLOCK(isr); 490 return error; 491bad: 492 if (isr) 493 IPSECREQUEST_UNLOCK(isr); 494 if (m) 495 m_freem(m); 496 return error; 497} 498#endif 499 500#ifdef INET6 501/* 502 * Chop IP6 header from the payload. 503 */ 504static struct mbuf * 505ipsec6_splithdr(struct mbuf *m) 506{ 507 struct mbuf *mh; 508 struct ip6_hdr *ip6; 509 int hlen; 510 511 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 512 ("first mbuf too short, len %u", m->m_len)); 513 ip6 = mtod(m, struct ip6_hdr *); 514 hlen = sizeof(struct ip6_hdr); 515 if (m->m_len > hlen) { 516 MGETHDR(mh, M_DONTWAIT, MT_DATA); 517 if (!mh) { 518 m_freem(m); 519 return NULL; 520 } 521 M_MOVE_PKTHDR(mh, m); 522 MH_ALIGN(mh, hlen); 523 m->m_len -= hlen; 524 m->m_data += hlen; 525 mh->m_next = m; 526 m = mh; 527 m->m_len = hlen; 528 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 529 } else if (m->m_len < hlen) { 530 m = m_pullup(m, hlen); 531 if (!m) 532 return NULL; 533 } 534 return m; 535} 536 537/* 538 * IPsec output logic for IPv6, transport mode. 539 */ 540int 541ipsec6_output_trans( 542 struct ipsec_output_state *state, 543 u_char *nexthdrp, 544 struct mbuf *mprev, 545 struct secpolicy *sp, 546 int flags, 547 int *tun) 548{ 549 struct ipsecrequest *isr; 550 struct secasindex saidx; 551 int error = 0; 552 struct mbuf *m; 553 554 IPSEC_ASSERT(state != NULL, ("null state")); 555 IPSEC_ASSERT(state->m != NULL, ("null m")); 556 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 557 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 558 IPSEC_ASSERT(sp != NULL, ("null sp")); 559 IPSEC_ASSERT(tun != NULL, ("null tun")); 560 561 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 562 printf("%s: applied SP\n", __func__); 563 kdebug_secpolicy(sp)); 564 565 isr = sp->req; 566 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 567 /* the rest will be handled by ipsec6_output_tunnel() */ 568 *tun = 1; /* need tunnel-mode processing */ 569 return 0; 570 } 571 572 *tun = 0; 573 m = state->m; 574 575 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 576 if (isr == NULL) { 577#ifdef notdef 578 /* XXX should notification be done for all errors ? */ 579 /* 580 * Notify the fact that the packet is discarded 581 * to ourselves. I believe this is better than 582 * just silently discarding. (jinmei@kame.net) 583 * XXX: should we restrict the error to TCP packets? 584 * XXX: should we directly notify sockets via 585 * pfctlinputs? 586 */ 587 icmp6_error(m, ICMP6_DST_UNREACH, 588 ICMP6_DST_UNREACH_ADMIN, 0); 589 m = NULL; /* NB: icmp6_error frees mbuf */ 590#endif 591 goto bad; 592 } 593 594 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 595 sizeof (struct ip6_hdr), 596 offsetof(struct ip6_hdr, ip6_nxt)); 597bad: 598 if (m) 599 m_freem(m); 600 state->m = NULL; 601 return error; 602} 603 604static int 605ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 606{ 607 struct ip6_hdr *oip6; 608 struct ip6_hdr *ip6; 609 size_t plen; 610 611 /* can't tunnel between different AFs */ 612 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 613 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 614 m_freem(m); 615 return EINVAL; 616 } 617 IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr), 618 ("mbuf wrong size; len %u", m->m_len)); 619 620 621 /* 622 * grow the mbuf to accomodate the new IPv6 header. 623 */ 624 plen = m->m_pkthdr.len; 625 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 626 struct mbuf *n; 627 MGET(n, M_DONTWAIT, MT_DATA); 628 if (!n) { 629 m_freem(m); 630 return ENOBUFS; 631 } 632 n->m_len = sizeof(struct ip6_hdr); 633 n->m_next = m->m_next; 634 m->m_next = n; 635 m->m_pkthdr.len += sizeof(struct ip6_hdr); 636 oip6 = mtod(n, struct ip6_hdr *); 637 } else { 638 m->m_next->m_len += sizeof(struct ip6_hdr); 639 m->m_next->m_data -= sizeof(struct ip6_hdr); 640 m->m_pkthdr.len += sizeof(struct ip6_hdr); 641 oip6 = mtod(m->m_next, struct ip6_hdr *); 642 } 643 ip6 = mtod(m, struct ip6_hdr *); 644 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 645 646 /* Fake link-local scope-class addresses */ 647 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 648 oip6->ip6_src.s6_addr16[1] = 0; 649 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 650 oip6->ip6_dst.s6_addr16[1] = 0; 651 652 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 653 /* ECN consideration. */ 654 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 655 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 656 ip6->ip6_plen = htons(plen); 657 else { 658 /* ip6->ip6_plen will be updated in ip6_output() */ 659 } 660 ip6->ip6_nxt = IPPROTO_IPV6; 661 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 662 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 663 ip6->ip6_hlim = IPV6_DEFHLIM; 664 665 /* XXX Should ip6_src be updated later ? */ 666 667 return 0; 668} 669 670/* 671 * IPsec output logic for IPv6, tunnel mode. 672 */ 673int 674ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 675{ 676 struct ip6_hdr *ip6; 677 struct ipsecrequest *isr; 678 struct secasindex saidx; 679 int error; 680 struct sockaddr_in6* dst6; 681 struct mbuf *m; 682 683 IPSEC_ASSERT(state != NULL, ("null state")); 684 IPSEC_ASSERT(state->m != NULL, ("null m")); 685 IPSEC_ASSERT(sp != NULL, ("null sp")); 686 687 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 688 printf("%s: applied SP\n", __func__); 689 kdebug_secpolicy(sp)); 690 691 m = state->m; 692 /* 693 * transport mode ipsec (before the 1st tunnel mode) is already 694 * processed by ipsec6_output_trans(). 695 */ 696 for (isr = sp->req; isr; isr = isr->next) { 697 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 698 break; 699 } 700 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 701 if (isr == NULL) 702 goto bad; 703 704 /* 705 * There may be the case that SA status will be changed when 706 * we are refering to one. So calling splsoftnet(). 707 */ 708 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 709 /* 710 * build IPsec tunnel. 711 */ 712 /* XXX should be processed with other familiy */ 713 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 714 ipseclog((LOG_ERR, "%s: family mismatched between " 715 "inner and outer, spi=%u\n", __func__, 716 ntohl(isr->sav->spi))); 717 newipsecstat.ips_out_inval++; 718 error = EAFNOSUPPORT; 719 goto bad; 720 } 721 722 m = ipsec6_splithdr(m); 723 if (!m) { 724 newipsecstat.ips_out_nomem++; 725 error = ENOMEM; 726 goto bad; 727 } 728 error = ipsec6_encapsulate(m, isr->sav); 729 if (error) { 730 m = NULL; 731 goto bad; 732 } 733 ip6 = mtod(m, struct ip6_hdr *); 734 735 state->ro = &isr->sav->sah->sa_route; 736 state->dst = (struct sockaddr *)&state->ro->ro_dst; 737 dst6 = (struct sockaddr_in6 *)state->dst; 738 if (state->ro->ro_rt 739 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 740 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 741 RTFREE(state->ro->ro_rt); 742 state->ro->ro_rt = NULL; 743 } 744 if (state->ro->ro_rt == 0) { 745 bzero(dst6, sizeof(*dst6)); 746 dst6->sin6_family = AF_INET6; 747 dst6->sin6_len = sizeof(*dst6); 748 dst6->sin6_addr = ip6->ip6_dst; 749 rtalloc(state->ro); 750 } 751 if (state->ro->ro_rt == 0) { 752 ip6stat.ip6s_noroute++; 753 newipsecstat.ips_out_noroute++; 754 error = EHOSTUNREACH; 755 goto bad; 756 } 757 758 /* adjust state->dst if tunnel endpoint is offlink */ 759 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 760 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 761 dst6 = (struct sockaddr_in6 *)state->dst; 762 } 763 } 764 765 m = ipsec6_splithdr(m); 766 if (!m) { 767 newipsecstat.ips_out_nomem++; 768 error = ENOMEM; 769 goto bad; 770 } 771 ip6 = mtod(m, struct ip6_hdr *); 772 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 773 sizeof (struct ip6_hdr), 774 offsetof(struct ip6_hdr, ip6_nxt)); 775bad: 776 if (m) 777 m_freem(m); 778 state->m = NULL; 779 return error; 780} 781#endif /*INET6*/ 782