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 * $FreeBSD$ 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/pfil.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 #include <netinet/in_var.h> 55 #include <netinet/ip_ecn.h> 56 #ifdef INET6 57 #include <netinet6/ip6_ecn.h> 58 #endif 59 60 #include <netinet/ip6.h> 61 #ifdef INET6 62 #include <netinet6/ip6_var.h> 63 #endif 64 #include <netinet/in_pcb.h> 65 #ifdef INET6 66 #include <netinet/icmp6.h> 67 #endif 68 69 #include <netipsec/ipsec.h> 70 #ifdef INET6 71 #include <netipsec/ipsec6.h> 72 #endif 73 #include <netipsec/ah_var.h> 74 #include <netipsec/esp_var.h> 75 #include <netipsec/ipcomp_var.h> 76 77 #include <netipsec/xform.h> 78 79 #include <netipsec/key.h> 80 #include <netipsec/keydb.h> 81 #include <netipsec/key_debug.h> 82 83 #include <machine/in_cksum.h> 84 85 int 86 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 87 { 88 struct tdb_ident *tdbi; 89 struct m_tag *mtag; 90 struct secasvar *sav; 91 struct secasindex *saidx; 92 int error; 93 94 IPSEC_SPLASSERT_SOFTNET(__func__); 95 96 IPSEC_ASSERT(m != NULL, ("null mbuf")); 97 IPSEC_ASSERT(isr != NULL, ("null ISR")); 98 sav = isr->sav; 99 IPSEC_ASSERT(sav != NULL, ("null SA")); 100 IPSEC_ASSERT(sav->sah != NULL, ("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(("%s: unknown protocol family %u\n", __func__, 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(("%s: could not get packet tag\n", __func__)); 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 ipsec4stat.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"); 189 bad: 190 m_freem(m); 191 KEY_FREESAV(&sav); 192 return (error); 193 } 194 195 static struct ipsecrequest * 196 ipsec_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 IPSEC_SPLASSERT_SOFTNET(__func__); 209 IPSECREQUEST_LOCK_ASSERT(isr); 210 211 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 212 ("invalid address family %u", af)); 213 again: 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 ipsec4stat.ips_out_nosa++; 286 goto bad; 287 } 288 sav = isr->sav; 289 if (sav == NULL) { /* XXX valid return */ 290 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 291 ("no SA found, but required; level %u", 292 ipsec_get_reqlevel(isr))); 293 IPSECREQUEST_UNLOCK(isr); 294 isr = isr->next; 295 if (isr == NULL) { 296 /*XXXstatistic??*/ 297 *error = EINVAL; /*XXX*/ 298 return isr; 299 } 300 IPSECREQUEST_LOCK(isr); 301 goto again; 302 } 303 304 /* 305 * Check system global policy controls. 306 */ 307 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 308 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 309 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 310 DPRINTF(("%s: IPsec outbound packet dropped due" 311 " to policy (check your sysctls)\n", __func__)); 312 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 313 ipcompstat.ipcomps_pdrops); 314 *error = EHOSTUNREACH; 315 goto bad; 316 } 317 318 /* 319 * Sanity check the SA contents for the caller 320 * before they invoke the xform output method. 321 */ 322 if (sav->tdb_xform == NULL) { 323 DPRINTF(("%s: no transform for SA\n", __func__)); 324 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 325 ipcompstat.ipcomps_noxform); 326 *error = EHOSTUNREACH; 327 goto bad; 328 } 329 return isr; 330 bad: 331 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 332 IPSECREQUEST_UNLOCK(isr); 333 return NULL; 334 #undef IPSEC_OSTAT 335 } 336 337 #ifdef INET 338 /* 339 * IPsec output logic for IPv4. 340 */ 341 int 342 ipsec4_process_packet( 343 struct mbuf *m, 344 struct ipsecrequest *isr, 345 int flags, 346 int tunalready) 347 { 348 struct secasindex saidx; 349 struct secasvar *sav; 350 struct ip *ip; 351 int error, i, off; 352 353 IPSEC_ASSERT(m != NULL, ("null mbuf")); 354 IPSEC_ASSERT(isr != NULL, ("null isr")); 355 356 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 357 358 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 359 if (isr == NULL) 360 goto bad; 361 362 sav = isr->sav; 363 364 #ifdef DEV_ENC 365 /* pass the mbuf to enc0 for bpf processing */ 366 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 367 /* pass the mbuf to enc0 for packet filtering */ 368 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 369 goto bad; 370 #endif 371 372 if (!tunalready) { 373 union sockaddr_union *dst = &sav->sah->saidx.dst; 374 int setdf; 375 376 /* 377 * Collect IP_DF state from the outer header. 378 */ 379 if (dst->sa.sa_family == AF_INET) { 380 if (m->m_len < sizeof (struct ip) && 381 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 382 error = ENOBUFS; 383 goto bad; 384 } 385 ip = mtod(m, struct ip *); 386 /* Honor system-wide control of how to handle IP_DF */ 387 switch (ip4_ipsec_dfbit) { 388 case 0: /* clear in outer header */ 389 case 1: /* set in outer header */ 390 setdf = ip4_ipsec_dfbit; 391 break; 392 default: /* propagate to outer header */ 393 setdf = ntohs(ip->ip_off & IP_DF); 394 break; 395 } 396 } else { 397 ip = NULL; /* keep compiler happy */ 398 setdf = 0; 399 } 400 /* Do the appropriate encapsulation, if necessary */ 401 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 402 dst->sa.sa_family != AF_INET || /* PF mismatch */ 403 #if 0 404 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 405 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 406 #endif 407 (dst->sa.sa_family == AF_INET && /* Proxy */ 408 dst->sin.sin_addr.s_addr != INADDR_ANY && 409 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 410 struct mbuf *mp; 411 412 /* Fix IPv4 header checksum and length */ 413 if (m->m_len < sizeof (struct ip) && 414 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 415 error = ENOBUFS; 416 goto bad; 417 } 418 ip = mtod(m, struct ip *); 419 ip->ip_len = htons(m->m_pkthdr.len); 420 ip->ip_sum = 0; 421 #ifdef _IP_VHL 422 if (ip->ip_vhl == IP_VHL_BORING) 423 ip->ip_sum = in_cksum_hdr(ip); 424 else 425 ip->ip_sum = in_cksum(m, 426 _IP_VHL_HL(ip->ip_vhl) << 2); 427 #else 428 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 429 #endif 430 431 /* Encapsulate the packet */ 432 error = ipip_output(m, isr, &mp, 0, 0); 433 if (mp == NULL && !error) { 434 /* Should never happen. */ 435 DPRINTF(("%s: ipip_output returns no mbuf and " 436 "no error!", __func__)); 437 error = EFAULT; 438 } 439 if (error) { 440 if (mp) { 441 /* XXX: Should never happen! */ 442 m_freem(mp); 443 } 444 m = NULL; /* ipip_output() already freed it */ 445 goto bad; 446 } 447 m = mp, mp = NULL; 448 /* 449 * ipip_output clears IP_DF in the new header. If 450 * we need to propagate IP_DF from the outer header, 451 * then we have to do it here. 452 * 453 * XXX shouldn't assume what ipip_output does. 454 */ 455 if (dst->sa.sa_family == AF_INET && setdf) { 456 if (m->m_len < sizeof (struct ip) && 457 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 458 error = ENOBUFS; 459 goto bad; 460 } 461 ip = mtod(m, struct ip *); 462 ip->ip_off = ntohs(ip->ip_off); 463 ip->ip_off |= IP_DF; 464 ip->ip_off = htons(ip->ip_off); 465 } 466 } 467 } 468 469 #ifdef DEV_ENC 470 /* pass the mbuf to enc0 for bpf processing */ 471 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 472 /* pass the mbuf to enc0 for packet filtering */ 473 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 474 goto bad; 475 #endif 476 477 /* 478 * Dispatch to the appropriate IPsec transform logic. The 479 * packet will be returned for transmission after crypto 480 * processing, etc. are completed. For encapsulation we 481 * bypass this call because of the explicit call done above 482 * (necessary to deal with IP_DF handling for IPv4). 483 * 484 * NB: m & sav are ``passed to caller'' who's reponsible for 485 * for reclaiming their resources. 486 */ 487 if (sav->tdb_xform->xf_type != XF_IP4) { 488 ip = mtod(m, struct ip *); 489 i = ip->ip_hl << 2; 490 off = offsetof(struct ip, ip_p); 491 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 492 } else { 493 error = ipsec_process_done(m, isr); 494 } 495 IPSECREQUEST_UNLOCK(isr); 496 return error; 497 bad: 498 if (isr) 499 IPSECREQUEST_UNLOCK(isr); 500 if (m) 501 m_freem(m); 502 return error; 503 } 504 #endif 505 506 #ifdef INET6 507 /* 508 * Chop IP6 header from the payload. 509 */ 510 static struct mbuf * 511 ipsec6_splithdr(struct mbuf *m) 512 { 513 struct mbuf *mh; 514 struct ip6_hdr *ip6; 515 int hlen; 516 517 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 518 ("first mbuf too short, len %u", m->m_len)); 519 ip6 = mtod(m, struct ip6_hdr *); 520 hlen = sizeof(struct ip6_hdr); 521 if (m->m_len > hlen) { 522 MGETHDR(mh, M_DONTWAIT, MT_DATA); 523 if (!mh) { 524 m_freem(m); 525 return NULL; 526 } 527 M_MOVE_PKTHDR(mh, m); 528 MH_ALIGN(mh, hlen); 529 m->m_len -= hlen; 530 m->m_data += hlen; 531 mh->m_next = m; 532 m = mh; 533 m->m_len = hlen; 534 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 535 } else if (m->m_len < hlen) { 536 m = m_pullup(m, hlen); 537 if (!m) 538 return NULL; 539 } 540 return m; 541 } 542 543 /* 544 * IPsec output logic for IPv6, transport mode. 545 */ 546 int 547 ipsec6_output_trans( 548 struct ipsec_output_state *state, 549 u_char *nexthdrp, 550 struct mbuf *mprev, 551 struct secpolicy *sp, 552 int flags, 553 int *tun) 554 { 555 struct ipsecrequest *isr; 556 struct secasindex saidx; 557 int error = 0; 558 struct mbuf *m; 559 560 IPSEC_ASSERT(state != NULL, ("null state")); 561 IPSEC_ASSERT(state->m != NULL, ("null m")); 562 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 563 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 564 IPSEC_ASSERT(sp != NULL, ("null sp")); 565 IPSEC_ASSERT(tun != NULL, ("null tun")); 566 567 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 568 printf("%s: applied SP\n", __func__); 569 kdebug_secpolicy(sp)); 570 571 isr = sp->req; 572 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 573 /* the rest will be handled by ipsec6_output_tunnel() */ 574 *tun = 1; /* need tunnel-mode processing */ 575 return 0; 576 } 577 578 *tun = 0; 579 m = state->m; 580 581 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 582 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 583 if (isr == NULL) { 584 #ifdef notdef 585 /* XXX should notification be done for all errors ? */ 586 /* 587 * Notify the fact that the packet is discarded 588 * to ourselves. I believe this is better than 589 * just silently discarding. (jinmei@kame.net) 590 * XXX: should we restrict the error to TCP packets? 591 * XXX: should we directly notify sockets via 592 * pfctlinputs? 593 */ 594 icmp6_error(m, ICMP6_DST_UNREACH, 595 ICMP6_DST_UNREACH_ADMIN, 0); 596 m = NULL; /* NB: icmp6_error frees mbuf */ 597 #endif 598 goto bad; 599 } 600 601 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 602 sizeof (struct ip6_hdr), 603 offsetof(struct ip6_hdr, 604 ip6_nxt)); 605 IPSECREQUEST_UNLOCK(isr); 606 return error; 607 bad: 608 if (isr) 609 IPSECREQUEST_UNLOCK(isr); 610 if (m) 611 m_freem(m); 612 state->m = NULL; 613 return error; 614 } 615 616 static int 617 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 618 { 619 struct ip6_hdr *oip6; 620 struct ip6_hdr *ip6; 621 size_t plen; 622 623 /* can't tunnel between different AFs */ 624 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 625 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 626 m_freem(m); 627 return EINVAL; 628 } 629 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 630 ("mbuf wrong size; len %u", m->m_len)); 631 632 633 /* 634 * grow the mbuf to accomodate the new IPv6 header. 635 */ 636 plen = m->m_pkthdr.len; 637 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 638 struct mbuf *n; 639 MGET(n, M_DONTWAIT, MT_DATA); 640 if (!n) { 641 m_freem(m); 642 return ENOBUFS; 643 } 644 n->m_len = sizeof(struct ip6_hdr); 645 n->m_next = m->m_next; 646 m->m_next = n; 647 m->m_pkthdr.len += sizeof(struct ip6_hdr); 648 oip6 = mtod(n, struct ip6_hdr *); 649 } else { 650 m->m_next->m_len += sizeof(struct ip6_hdr); 651 m->m_next->m_data -= sizeof(struct ip6_hdr); 652 m->m_pkthdr.len += sizeof(struct ip6_hdr); 653 oip6 = mtod(m->m_next, struct ip6_hdr *); 654 } 655 ip6 = mtod(m, struct ip6_hdr *); 656 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 657 658 /* Fake link-local scope-class addresses */ 659 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 660 oip6->ip6_src.s6_addr16[1] = 0; 661 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 662 oip6->ip6_dst.s6_addr16[1] = 0; 663 664 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 665 /* ECN consideration. */ 666 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 667 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 668 ip6->ip6_plen = htons(plen); 669 else { 670 /* ip6->ip6_plen will be updated in ip6_output() */ 671 } 672 ip6->ip6_nxt = IPPROTO_IPV6; 673 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 674 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 675 ip6->ip6_hlim = IPV6_DEFHLIM; 676 677 /* XXX Should ip6_src be updated later ? */ 678 679 return 0; 680 } 681 682 /* 683 * IPsec output logic for IPv6, tunnel mode. 684 */ 685 int 686 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 687 { 688 struct ip6_hdr *ip6; 689 struct ipsecrequest *isr; 690 struct secasindex saidx; 691 int error; 692 struct sockaddr_in6* dst6; 693 struct mbuf *m; 694 695 IPSEC_ASSERT(state != NULL, ("null state")); 696 IPSEC_ASSERT(state->m != NULL, ("null m")); 697 IPSEC_ASSERT(sp != NULL, ("null sp")); 698 699 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 700 printf("%s: applied SP\n", __func__); 701 kdebug_secpolicy(sp)); 702 703 m = state->m; 704 /* 705 * transport mode ipsec (before the 1st tunnel mode) is already 706 * processed by ipsec6_output_trans(). 707 */ 708 for (isr = sp->req; isr; isr = isr->next) { 709 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 710 break; 711 } 712 713 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 714 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 715 if (isr == NULL) 716 goto bad; 717 718 #ifdef DEV_ENC 719 /* pass the mbuf to enc0 for bpf processing */ 720 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 721 /* pass the mbuf to enc0 for packet filtering */ 722 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 723 goto bad; 724 #endif 725 726 /* 727 * There may be the case that SA status will be changed when 728 * we are refering to one. So calling splsoftnet(). 729 */ 730 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 731 /* 732 * build IPsec tunnel. 733 */ 734 /* XXX should be processed with other familiy */ 735 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 736 ipseclog((LOG_ERR, "%s: family mismatched between " 737 "inner and outer, spi=%u\n", __func__, 738 ntohl(isr->sav->spi))); 739 ipsec6stat.ips_out_inval++; 740 error = EAFNOSUPPORT; 741 goto bad; 742 } 743 744 m = ipsec6_splithdr(m); 745 if (!m) { 746 ipsec6stat.ips_out_nomem++; 747 error = ENOMEM; 748 goto bad; 749 } 750 error = ipsec6_encapsulate(m, isr->sav); 751 if (error) { 752 m = NULL; 753 goto bad; 754 } 755 ip6 = mtod(m, struct ip6_hdr *); 756 757 state->ro = &isr->sav->sah->sa_route; 758 state->dst = (struct sockaddr *)&state->ro->ro_dst; 759 dst6 = (struct sockaddr_in6 *)state->dst; 760 if (state->ro->ro_rt 761 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 762 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 763 RTFREE(state->ro->ro_rt); 764 state->ro->ro_rt = NULL; 765 } 766 if (state->ro->ro_rt == 0) { 767 bzero(dst6, sizeof(*dst6)); 768 dst6->sin6_family = AF_INET6; 769 dst6->sin6_len = sizeof(*dst6); 770 dst6->sin6_addr = ip6->ip6_dst; 771 rtalloc(state->ro); 772 } 773 if (state->ro->ro_rt == 0) { 774 ip6stat.ip6s_noroute++; 775 ipsec6stat.ips_out_noroute++; 776 error = EHOSTUNREACH; 777 goto bad; 778 } 779 780 /* adjust state->dst if tunnel endpoint is offlink */ 781 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 782 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 783 dst6 = (struct sockaddr_in6 *)state->dst; 784 } 785 } 786 787 m = ipsec6_splithdr(m); 788 if (!m) { 789 ipsec6stat.ips_out_nomem++; 790 error = ENOMEM; 791 goto bad; 792 } 793 ip6 = mtod(m, struct ip6_hdr *); 794 795 #ifdef DEV_ENC 796 /* pass the mbuf to enc0 for bpf processing */ 797 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 798 /* pass the mbuf to enc0 for packet filtering */ 799 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 800 goto bad; 801 #endif 802 803 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 804 sizeof (struct ip6_hdr), 805 offsetof(struct ip6_hdr, ip6_nxt)); 806 IPSECREQUEST_UNLOCK(isr); 807 return error; 808 bad: 809 if (isr) 810 IPSECREQUEST_UNLOCK(isr); 811 if (m) 812 m_freem(m); 813 state->m = NULL; 814 return error; 815 } 816 #endif /*INET6*/ 817