ipsec_output.c revision 1.54
1 /* $NetBSD: ipsec_output.c,v 1.54 2017/07/14 12:26:26 ozaki-r 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 1.54 2017/07/14 12:26:26 ozaki-r Exp $"); 33 34 /* 35 * IPsec output processing. 36 */ 37 #if defined(_KERNEL_OPT) 38 #include "opt_inet.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/mbuf.h> 44 #include <sys/domain.h> 45 #include <sys/protosw.h> 46 #include <sys/socket.h> 47 #include <sys/errno.h> 48 #include <sys/syslog.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/ip_var.h> 57 #include <netinet/in_var.h> 58 #include <netinet/ip_ecn.h> 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 #include <netinet/udp.h> 69 70 #include <netipsec/ipsec.h> 71 #include <netipsec/ipsec_var.h> 72 #include <netipsec/ipsec_private.h> 73 #ifdef INET6 74 #include <netipsec/ipsec6.h> 75 #endif 76 #include <netipsec/ah_var.h> 77 #include <netipsec/esp_var.h> 78 #include <netipsec/ipcomp_var.h> 79 80 #include <netipsec/xform.h> 81 82 #include <netipsec/key.h> 83 #include <netipsec/keydb.h> 84 #include <netipsec/key_debug.h> 85 86 #include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */ 87 88 89 /* 90 * Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing 91 * It will be used by ip{,6}_output to check if we have already or not 92 * processed this packet. 93 */ 94 static int 95 ipsec_register_done(struct mbuf *m, int * error) 96 { 97 struct m_tag *mtag; 98 99 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT); 100 if (mtag == NULL) { 101 IPSECLOG(LOG_DEBUG, "could not get packet tag\n"); 102 *error = ENOMEM; 103 return -1; 104 } 105 106 m_tag_prepend(m, mtag); 107 return 0; 108 } 109 110 static int 111 ipsec_reinject_ipstack(struct mbuf *m, int af) 112 { 113 #if defined(INET) || defined(INET6) 114 int rv; 115 #endif 116 117 switch (af) { 118 #ifdef INET 119 case AF_INET: 120 KERNEL_LOCK(1, NULL); 121 rv = ip_output(m, NULL, NULL, IP_RAWOUTPUT|IP_NOIPNEWID, 122 NULL, NULL); 123 KERNEL_UNLOCK_ONE(NULL); 124 return rv; 125 126 #endif /* INET */ 127 #ifdef INET6 128 case AF_INET6: 129 /* 130 * We don't need massage, IPv6 header fields are always in 131 * net endian. 132 */ 133 KERNEL_LOCK(1, NULL); 134 rv = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 135 KERNEL_UNLOCK_ONE(NULL); 136 return rv; 137 #endif /* INET6 */ 138 } 139 140 panic("ipsec_reinject_ipstack : iunknown protocol family %u\n", af); 141 return -1; /* NOTREACHED */ 142 } 143 144 int 145 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr, 146 struct secasvar *sav) 147 { 148 struct secasindex *saidx; 149 int error; 150 #ifdef INET 151 struct ip * ip; 152 #endif /* INET */ 153 #ifdef INET6 154 struct ip6_hdr * ip6; 155 #endif /* INET6 */ 156 struct mbuf * mo; 157 struct udphdr *udp = NULL; 158 uint64_t * data = NULL; 159 int hlen, roff; 160 161 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 162 163 KASSERT(m != NULL); 164 KASSERT(isr != NULL); 165 KASSERT(sav != NULL); 166 167 saidx = &sav->sah->saidx; 168 169 if(sav->natt_type != 0) { 170 ip = mtod(m, struct ip *); 171 172 hlen = sizeof(struct udphdr); 173 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 174 hlen += sizeof(uint64_t); 175 176 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 177 if (mo == NULL) { 178 char buf[IPSEC_ADDRSTRLEN]; 179 IPSECLOG(LOG_DEBUG, 180 "failed to inject %u byte UDP for SA %s/%08lx\n", 181 hlen, ipsec_address(&saidx->dst, buf, sizeof(buf)), 182 (u_long) ntohl(sav->spi)); 183 error = ENOBUFS; 184 goto bad; 185 } 186 187 udp = (struct udphdr*) (mtod(mo, char*) + roff); 188 data = (uint64_t*) (udp + 1); 189 190 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 191 *data = 0; /* NON-IKE Marker */ 192 193 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 194 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 195 else 196 udp->uh_sport = key_portfromsaddr(&saidx->src); 197 198 udp->uh_dport = key_portfromsaddr(&saidx->dst); 199 udp->uh_sum = 0; 200 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 201 } 202 203 switch (saidx->dst.sa.sa_family) { 204 #ifdef INET 205 case AF_INET: 206 /* Fix the header length, for AH processing. */ 207 ip = mtod(m, struct ip *); 208 ip->ip_len = htons(m->m_pkthdr.len); 209 if (sav->natt_type != 0) 210 ip->ip_p = IPPROTO_UDP; 211 break; 212 #endif /* INET */ 213 #ifdef INET6 214 case AF_INET6: 215 /* Fix the header length, for AH processing. */ 216 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 217 error = ENXIO; 218 goto bad; 219 } 220 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 221 /* No jumbogram support. */ 222 error = ENXIO; /*?*/ 223 goto bad; 224 } 225 ip6 = mtod(m, struct ip6_hdr *); 226 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 227 if (sav->natt_type != 0) 228 ip6->ip6_nxt = IPPROTO_UDP; 229 break; 230 #endif /* INET6 */ 231 default: 232 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 233 saidx->dst.sa.sa_family); 234 error = ENXIO; 235 goto bad; 236 } 237 238 key_sa_recordxfer(sav, m); 239 240 /* 241 * If there's another (bundled) SA to apply, do so. 242 * Note that this puts a burden on the kernel stack size. 243 * If this is a problem we'll need to introduce a queue 244 * to set the packet on so we can unwind the stack before 245 * doing further processing. 246 */ 247 if (isr->next) { 248 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 249 switch ( saidx->dst.sa.sa_family ) { 250 #ifdef INET 251 case AF_INET: 252 return ipsec4_process_packet(m, isr->next); 253 #endif /* INET */ 254 #ifdef INET6 255 case AF_INET6: 256 return ipsec6_process_packet(m,isr->next); 257 #endif /* INET6 */ 258 default : 259 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 260 saidx->dst.sa.sa_family); 261 error = ENXIO; 262 goto bad; 263 } 264 } 265 266 /* 267 * We're done with IPsec processing, 268 * mark that we have already processed the packet 269 * transmit it packet using the appropriate network protocol (IP or IPv6). 270 */ 271 272 if (ipsec_register_done(m, &error) < 0) 273 goto bad; 274 275 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 276 bad: 277 m_freem(m); 278 KEY_FREESAV(&sav); 279 return (error); 280 } 281 282 /* 283 * ipsec_nextisr can return : 284 * - isr == NULL and error != 0 => something is bad : the packet must be 285 * discarded 286 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 287 * is done, reinject it in ip stack 288 * - isr != NULL (error == 0) => we need to apply one rule to the packet 289 */ 290 static struct ipsecrequest * 291 ipsec_nextisr( 292 struct mbuf *m, 293 struct ipsecrequest *isr, 294 int af, 295 int *error, 296 struct secasvar **ret 297 ) 298 { 299 #define IPSEC_OSTAT(type) \ 300 do { \ 301 switch (isr->saidx.proto) { \ 302 case IPPROTO_ESP: \ 303 ESP_STATINC(ESP_STAT_ ## type); \ 304 break; \ 305 case IPPROTO_AH: \ 306 AH_STATINC(AH_STAT_ ## type); \ 307 break; \ 308 default: \ 309 IPCOMP_STATINC(IPCOMP_STAT_ ## type); \ 310 break; \ 311 } \ 312 } while (/*CONSTCOND*/0) 313 314 struct secasvar *sav = NULL; 315 struct secasindex *saidx; 316 317 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 318 KASSERTMSG(af == AF_INET || af == AF_INET6, 319 "invalid address family %u", af); 320 again: 321 /* 322 * Craft SA index to search for proper SA. Note that 323 * we only fillin unspecified SA peers for transport 324 * mode; for tunnel mode they must already be filled in. 325 */ 326 saidx = &isr->saidx; 327 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 328 /* Fillin unspecified SA peers only for transport mode */ 329 if (af == AF_INET) { 330 struct sockaddr_in *sin; 331 struct ip *ip = mtod(m, struct ip *); 332 333 if (saidx->src.sa.sa_len == 0) { 334 sin = &saidx->src.sin; 335 sin->sin_len = sizeof(*sin); 336 sin->sin_family = AF_INET; 337 sin->sin_port = IPSEC_PORT_ANY; 338 sin->sin_addr = ip->ip_src; 339 } 340 if (saidx->dst.sa.sa_len == 0) { 341 sin = &saidx->dst.sin; 342 sin->sin_len = sizeof(*sin); 343 sin->sin_family = AF_INET; 344 sin->sin_port = IPSEC_PORT_ANY; 345 sin->sin_addr = ip->ip_dst; 346 } 347 } else { 348 struct sockaddr_in6 *sin6; 349 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 350 351 if (saidx->src.sin6.sin6_len == 0) { 352 sin6 = (struct sockaddr_in6 *)&saidx->src; 353 sin6->sin6_len = sizeof(*sin6); 354 sin6->sin6_family = AF_INET6; 355 sin6->sin6_port = IPSEC_PORT_ANY; 356 sin6->sin6_addr = ip6->ip6_src; 357 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 358 /* fix scope id for comparing SPD */ 359 sin6->sin6_addr.s6_addr16[1] = 0; 360 sin6->sin6_scope_id = 361 ntohs(ip6->ip6_src.s6_addr16[1]); 362 } 363 } 364 if (saidx->dst.sin6.sin6_len == 0) { 365 sin6 = (struct sockaddr_in6 *)&saidx->dst; 366 sin6->sin6_len = sizeof(*sin6); 367 sin6->sin6_family = AF_INET6; 368 sin6->sin6_port = IPSEC_PORT_ANY; 369 sin6->sin6_addr = ip6->ip6_dst; 370 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 371 /* fix scope id for comparing SPD */ 372 sin6->sin6_addr.s6_addr16[1] = 0; 373 sin6->sin6_scope_id = 374 ntohs(ip6->ip6_dst.s6_addr16[1]); 375 } 376 } 377 } 378 } 379 380 /* 381 * Lookup SA and validate it. 382 */ 383 *error = key_checkrequest(isr, &sav); 384 if (*error != 0) { 385 /* 386 * IPsec processing is required, but no SA found. 387 * I assume that key_acquire() had been called 388 * to get/establish the SA. Here I discard 389 * this packet because it is responsibility for 390 * upper layer to retransmit the packet. 391 */ 392 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 393 goto bad; 394 } 395 /* sav may be NULL here if we have an USE rule */ 396 if (sav == NULL) { 397 KASSERTMSG(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 398 "no SA found, but required; level %u", 399 ipsec_get_reqlevel(isr)); 400 isr = isr->next; 401 /* 402 * No more rules to apply, return NULL isr and no error 403 * It can happen when the last rules are USE rules 404 * */ 405 if (isr == NULL) { 406 *ret = NULL; 407 *error = 0; 408 return isr; 409 } 410 goto again; 411 } 412 413 /* 414 * Check system global policy controls. 415 */ 416 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 417 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 418 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 419 IPSECLOG(LOG_DEBUG, "IPsec outbound packet dropped due" 420 " to policy (check your sysctls)\n"); 421 IPSEC_OSTAT(PDROPS); 422 *error = EHOSTUNREACH; 423 KEY_FREESAV(&sav); 424 goto bad; 425 } 426 427 /* 428 * Sanity check the SA contents for the caller 429 * before they invoke the xform output method. 430 */ 431 KASSERT(sav->tdb_xform != NULL); 432 *ret = sav; 433 return isr; 434 bad: 435 KASSERTMSG(*error != 0, "error return w/ no error code"); 436 return NULL; 437 #undef IPSEC_OSTAT 438 } 439 440 #ifdef INET 441 /* 442 * IPsec output logic for IPv4. 443 */ 444 int 445 ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 446 { 447 struct secasvar *sav = NULL; 448 struct ip *ip; 449 int s, error, i, off; 450 union sockaddr_union *dst; 451 int setdf; 452 453 KASSERT(m != NULL); 454 KASSERT(isr != NULL); 455 456 s = splsoftnet(); /* insure SA contents don't change */ 457 458 isr = ipsec_nextisr(m, isr, AF_INET, &error, &sav); 459 if (isr == NULL) { 460 if (error != 0) { 461 goto bad; 462 } else { 463 if (ipsec_register_done(m, &error) < 0) 464 goto bad; 465 466 splx(s); 467 return ipsec_reinject_ipstack(m, AF_INET); 468 } 469 } 470 471 KASSERT(sav != NULL); 472 dst = &sav->sah->saidx.dst; 473 474 /* 475 * Collect IP_DF state from the outer header. 476 */ 477 if (dst->sa.sa_family == AF_INET) { 478 if (m->m_len < sizeof (struct ip) && 479 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 480 error = ENOBUFS; 481 goto unrefsav; 482 } 483 ip = mtod(m, struct ip *); 484 /* Honor system-wide control of how to handle IP_DF */ 485 switch (ip4_ipsec_dfbit) { 486 case 0: /* clear in outer header */ 487 case 1: /* set in outer header */ 488 setdf = ip4_ipsec_dfbit; 489 break; 490 default: /* propagate to outer header */ 491 setdf = ip->ip_off; 492 setdf = ntohs(setdf); 493 setdf = htons(setdf & IP_DF); 494 break; 495 } 496 } else { 497 ip = NULL; /* keep compiler happy */ 498 setdf = 0; 499 } 500 /* Do the appropriate encapsulation, if necessary */ 501 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 502 dst->sa.sa_family != AF_INET || /* PF mismatch */ 503 #if 0 504 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 505 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 506 #endif 507 (dst->sa.sa_family == AF_INET && /* Proxy */ 508 dst->sin.sin_addr.s_addr != INADDR_ANY && 509 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 510 struct mbuf *mp; 511 512 /* Fix IPv4 header checksum and length */ 513 if (m->m_len < sizeof (struct ip) && 514 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 515 error = ENOBUFS; 516 goto unrefsav; 517 } 518 ip = mtod(m, struct ip *); 519 ip->ip_len = htons(m->m_pkthdr.len); 520 ip->ip_sum = 0; 521 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 522 523 /* Encapsulate the packet */ 524 error = ipip_output(m, isr, sav, &mp, 0, 0); 525 if (mp == NULL && !error) { 526 /* Should never happen. */ 527 IPSECLOG(LOG_DEBUG, 528 "ipip_output returns no mbuf and no error!"); 529 error = EFAULT; 530 } 531 if (error) { 532 if (mp) { 533 /* XXX: Should never happen! */ 534 m_freem(mp); 535 } 536 m = NULL; /* ipip_output() already freed it */ 537 goto unrefsav; 538 } 539 m = mp, mp = NULL; 540 /* 541 * ipip_output clears IP_DF in the new header. If 542 * we need to propagate IP_DF from the outer header, 543 * then we have to do it here. 544 * 545 * XXX shouldn't assume what ipip_output does. 546 */ 547 if (dst->sa.sa_family == AF_INET && setdf) { 548 if (m->m_len < sizeof (struct ip) && 549 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 550 error = ENOBUFS; 551 goto unrefsav; 552 } 553 ip = mtod(m, struct ip *); 554 ip->ip_off |= htons(IP_DF); 555 } 556 } 557 558 /* 559 * Dispatch to the appropriate IPsec transform logic. The 560 * packet will be returned for transmission after crypto 561 * processing, etc. are completed. For encapsulation we 562 * bypass this call because of the explicit call done above 563 * (necessary to deal with IP_DF handling for IPv4). 564 * 565 * NB: m & sav are ``passed to caller'' who's reponsible for 566 * for reclaiming their resources. 567 */ 568 if (sav->tdb_xform->xf_type != XF_IP4) { 569 if (dst->sa.sa_family == AF_INET) { 570 ip = mtod(m, struct ip *); 571 i = ip->ip_hl << 2; 572 off = offsetof(struct ip, ip_p); 573 } else { 574 i = sizeof(struct ip6_hdr); 575 off = offsetof(struct ip6_hdr, ip6_nxt); 576 } 577 error = (*sav->tdb_xform->xf_output)(m, isr, sav, NULL, i, off); 578 } else { 579 error = ipsec_process_done(m, isr, sav); 580 } 581 KEY_FREESAV(&sav); 582 splx(s); 583 return error; 584 unrefsav: 585 KEY_FREESAV(&sav); 586 bad: 587 splx(s); 588 if (m) 589 m_freem(m); 590 return error; 591 } 592 #endif 593 594 #ifdef INET6 595 static void 596 compute_ipsec_pos(struct mbuf *m, int *i, int *off) 597 { 598 int nxt; 599 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr*); 600 struct ip6_ext ip6e; 601 int dstopt = 0; 602 603 *i = sizeof(struct ip6_hdr); 604 *off = offsetof(struct ip6_hdr, ip6_nxt); 605 nxt = ip6->ip6_nxt; 606 607 /* 608 * chase mbuf chain to find the appropriate place to 609 * put AH/ESP/IPcomp header. 610 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 611 */ 612 do { 613 switch (nxt) { 614 case IPPROTO_AH: 615 case IPPROTO_ESP: 616 case IPPROTO_IPCOMP: 617 /* 618 * we should not skip security header added 619 * beforehand. 620 */ 621 return; 622 623 case IPPROTO_HOPOPTS: 624 case IPPROTO_DSTOPTS: 625 case IPPROTO_ROUTING: 626 /* 627 * if we see 2nd destination option header, 628 * we should stop there. 629 */ 630 if (nxt == IPPROTO_DSTOPTS && dstopt) 631 return; 632 633 if (nxt == IPPROTO_DSTOPTS) { 634 /* 635 * seen 1st or 2nd destination option. 636 * next time we see one, it must be 2nd. 637 */ 638 dstopt = 1; 639 } else if (nxt == IPPROTO_ROUTING) { 640 /* 641 * if we see destionation option next 642 * time, it must be dest2. 643 */ 644 dstopt = 2; 645 } 646 647 /* skip this header */ 648 m_copydata(m, *i, sizeof(ip6e), &ip6e); 649 nxt = ip6e.ip6e_nxt; 650 *off = *i + offsetof(struct ip6_ext, ip6e_nxt); 651 /* 652 * we will never see nxt == IPPROTO_AH 653 * so it is safe to omit AH case. 654 */ 655 *i += (ip6e.ip6e_len + 1) << 3; 656 break; 657 default: 658 return; 659 } 660 } while (*i < m->m_pkthdr.len); 661 } 662 663 static int 664 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 665 { 666 struct in6_addr ia2; 667 668 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 669 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 670 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 671 672 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 673 } 674 675 int 676 ipsec6_process_packet( 677 struct mbuf *m, 678 struct ipsecrequest *isr 679 ) 680 { 681 struct secasvar *sav = NULL; 682 struct ip6_hdr *ip6; 683 int s, error, i, off; 684 union sockaddr_union *dst; 685 686 KASSERT(m != NULL); 687 KASSERT(isr != NULL); 688 689 s = splsoftnet(); /* insure SA contents don't change */ 690 691 isr = ipsec_nextisr(m, isr, AF_INET6, &error, &sav); 692 if (isr == NULL) { 693 if (error != 0) { 694 /* XXX Should we send a notification ? */ 695 goto bad; 696 } else { 697 if (ipsec_register_done(m, &error) < 0) 698 goto bad; 699 700 splx(s); 701 return ipsec_reinject_ipstack(m, AF_INET6); 702 } 703 } 704 705 KASSERT(sav != NULL); 706 dst = &sav->sah->saidx.dst; 707 708 ip6 = mtod(m, struct ip6_hdr *); /* XXX */ 709 710 /* Do the appropriate encapsulation, if necessary */ 711 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 712 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 713 ((dst->sa.sa_family == AF_INET6) && 714 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 715 (!in6_sa_equal_addrwithscope(&dst->sin6, 716 &ip6->ip6_dst)))) { 717 struct mbuf *mp; 718 719 /* Fix IPv6 header payload length. */ 720 if (m->m_len < sizeof(struct ip6_hdr)) { 721 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 722 error = ENOBUFS; 723 goto unrefsav; 724 } 725 } 726 727 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 728 /* No jumbogram support. */ 729 error = ENXIO; /*XXX*/ 730 goto unrefsav; 731 } 732 733 ip6 = mtod(m, struct ip6_hdr *); 734 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 735 736 /* Encapsulate the packet */ 737 error = ipip_output(m, isr, sav, &mp, 0, 0); 738 if (mp == NULL && !error) { 739 /* Should never happen. */ 740 IPSECLOG(LOG_DEBUG, 741 "ipip_output returns no mbuf and no error!"); 742 error = EFAULT; 743 } 744 745 if (error) { 746 if (mp) { 747 /* XXX: Should never happen! */ 748 m_freem(mp); 749 } 750 m = NULL; /* ipip_output() already freed it */ 751 goto unrefsav; 752 } 753 754 m = mp; 755 mp = NULL; 756 } 757 758 if (dst->sa.sa_family == AF_INET) { 759 struct ip *ip; 760 ip = mtod(m, struct ip *); 761 i = ip->ip_hl << 2; 762 off = offsetof(struct ip, ip_p); 763 } else { 764 compute_ipsec_pos(m, &i, &off); 765 } 766 error = (*sav->tdb_xform->xf_output)(m, isr, sav, NULL, i, off); 767 KEY_FREESAV(&sav); 768 splx(s); 769 return error; 770 unrefsav: 771 KEY_FREESAV(&sav); 772 bad: 773 splx(s); 774 if (m) 775 m_freem(m); 776 return error; 777 } 778 #endif /*INET6*/ 779
Indexes created Tue Sep 23 07:09:52 GMT 2025