ipsec_output.c revision 1.80
1 /* $NetBSD: ipsec_output.c,v 1.80 2018/05/31 15:06:45 maxv 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: 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 1.80 2018/05/31 15:06:45 maxv Exp $"); 33 34 #if defined(_KERNEL_OPT) 35 #include "opt_inet.h" 36 #include "opt_net_mpsafe.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/domain.h> 43 #include <sys/protosw.h> 44 #include <sys/socket.h> 45 #include <sys/errno.h> 46 #include <sys/syslog.h> 47 48 #include <net/if.h> 49 #include <net/route.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip_ecn.h> 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 #include <netinet/udp.h> 67 68 #include <netipsec/ipsec.h> 69 #include <netipsec/ipsec_var.h> 70 #include <netipsec/ipsec_private.h> 71 #ifdef INET6 72 #include <netipsec/ipsec6.h> 73 #endif 74 #include <netipsec/ah_var.h> 75 #include <netipsec/esp_var.h> 76 #include <netipsec/ipcomp_var.h> 77 78 #include <netipsec/xform.h> 79 80 #include <netipsec/key.h> 81 #include <netipsec/keydb.h> 82 #include <netipsec/key_debug.h> 83 84 static percpu_t *ipsec_rtcache_percpu __cacheline_aligned; 85 86 /* 87 * Add a IPSEC_OUT_DONE tag to mark that we have finished the ipsec processing 88 * It will be used by ip{,6}_output to check if we have already or not 89 * processed this packet. 90 */ 91 static int 92 ipsec_register_done(struct mbuf *m, int *error) 93 { 94 struct m_tag *mtag; 95 96 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 0, M_NOWAIT); 97 if (mtag == NULL) { 98 IPSECLOG(LOG_DEBUG, "could not get packet tag\n"); 99 *error = ENOMEM; 100 return -1; 101 } 102 103 m_tag_prepend(m, mtag); 104 return 0; 105 } 106 107 static int 108 ipsec_reinject_ipstack(struct mbuf *m, int af) 109 { 110 int rv = -1; 111 struct route *ro; 112 113 KASSERT(af == AF_INET || af == AF_INET6); 114 115 KERNEL_LOCK_UNLESS_NET_MPSAFE(); 116 ro = percpu_getref(ipsec_rtcache_percpu); 117 switch (af) { 118 #ifdef INET 119 case AF_INET: 120 rv = ip_output(m, NULL, ro, IP_RAWOUTPUT|IP_NOIPNEWID, 121 NULL, NULL); 122 break; 123 #endif 124 #ifdef INET6 125 case AF_INET6: 126 /* 127 * We don't need massage, IPv6 header fields are always in 128 * net endian. 129 */ 130 rv = ip6_output(m, NULL, ro, 0, NULL, NULL, NULL); 131 break; 132 #endif 133 } 134 percpu_putref(ipsec_rtcache_percpu); 135 KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 136 137 return rv; 138 } 139 140 int 141 ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr, 142 struct secasvar *sav) 143 { 144 struct secasindex *saidx; 145 int error; 146 #ifdef INET 147 struct ip *ip; 148 #endif 149 #ifdef INET6 150 struct ip6_hdr *ip6; 151 #endif 152 struct mbuf *mo; 153 struct udphdr *udp = NULL; 154 int hlen, roff; 155 156 KASSERT(m != NULL); 157 KASSERT(isr != NULL); 158 KASSERT(sav != NULL); 159 160 saidx = &sav->sah->saidx; 161 162 if (sav->natt_type != 0) { 163 ip = mtod(m, struct ip *); 164 165 hlen = sizeof(struct udphdr); 166 167 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 168 if (mo == NULL) { 169 char buf[IPSEC_ADDRSTRLEN]; 170 IPSECLOG(LOG_DEBUG, 171 "failed to inject %u byte UDP for SA %s/%08lx\n", 172 hlen, ipsec_address(&saidx->dst, buf, sizeof(buf)), 173 (u_long)ntohl(sav->spi)); 174 error = ENOBUFS; 175 goto bad; 176 } 177 178 udp = (struct udphdr *)(mtod(mo, char *) + roff); 179 udp->uh_sport = key_portfromsaddr(&saidx->src); 180 udp->uh_dport = key_portfromsaddr(&saidx->dst); 181 udp->uh_sum = 0; 182 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 183 } 184 185 /* 186 * Fix the header length, for AH processing. 187 */ 188 switch (saidx->dst.sa.sa_family) { 189 #ifdef INET 190 case AF_INET: 191 ip = mtod(m, struct ip *); 192 ip->ip_len = htons(m->m_pkthdr.len); 193 if (sav->natt_type != 0) 194 ip->ip_p = IPPROTO_UDP; 195 break; 196 #endif 197 #ifdef INET6 198 case AF_INET6: 199 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 200 error = ENXIO; 201 goto bad; 202 } 203 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) > IPV6_MAXPACKET) { 204 /* No jumbogram support. */ 205 error = ENXIO; /*?*/ 206 goto bad; 207 } 208 ip6 = mtod(m, struct ip6_hdr *); 209 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 210 if (sav->natt_type != 0) 211 ip6->ip6_nxt = IPPROTO_UDP; 212 break; 213 #endif 214 default: 215 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 216 saidx->dst.sa.sa_family); 217 error = ENXIO; 218 goto bad; 219 } 220 221 key_sa_recordxfer(sav, m); 222 223 /* 224 * If there's another (bundled) SA to apply, do so. 225 * Note that this puts a burden on the kernel stack size. 226 * If this is a problem we'll need to introduce a queue 227 * to set the packet on so we can unwind the stack before 228 * doing further processing. 229 */ 230 if (isr->next) { 231 IPSEC_STATINC(IPSEC_STAT_OUT_BUNDLESA); 232 switch (saidx->dst.sa.sa_family) { 233 #ifdef INET 234 case AF_INET: 235 return ipsec4_process_packet(m, isr->next, NULL); 236 #endif 237 #ifdef INET6 238 case AF_INET6: 239 return ipsec6_process_packet(m, isr->next); 240 #endif 241 default: 242 IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n", 243 saidx->dst.sa.sa_family); 244 error = ENXIO; 245 goto bad; 246 } 247 } 248 249 /* 250 * We're done with IPsec processing, mark the packet as processed, 251 * and transmit it using the appropriate network protocol 252 * (IPv4/IPv6). 253 */ 254 255 if (ipsec_register_done(m, &error) < 0) 256 goto bad; 257 258 return ipsec_reinject_ipstack(m, saidx->dst.sa.sa_family); 259 260 bad: 261 m_freem(m); 262 return error; 263 } 264 265 static void 266 ipsec_fill_saidx_bymbuf(struct secasindex *saidx, const struct mbuf *m, 267 const int af) 268 { 269 270 if (af == AF_INET) { 271 struct sockaddr_in *sin; 272 struct ip *ip = mtod(m, struct ip *); 273 274 if (saidx->src.sa.sa_len == 0) { 275 sin = &saidx->src.sin; 276 sin->sin_len = sizeof(*sin); 277 sin->sin_family = AF_INET; 278 sin->sin_port = IPSEC_PORT_ANY; 279 sin->sin_addr = ip->ip_src; 280 } 281 if (saidx->dst.sa.sa_len == 0) { 282 sin = &saidx->dst.sin; 283 sin->sin_len = sizeof(*sin); 284 sin->sin_family = AF_INET; 285 sin->sin_port = IPSEC_PORT_ANY; 286 sin->sin_addr = ip->ip_dst; 287 } 288 } else { 289 struct sockaddr_in6 *sin6; 290 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 291 292 if (saidx->src.sin6.sin6_len == 0) { 293 sin6 = (struct sockaddr_in6 *)&saidx->src; 294 sin6->sin6_len = sizeof(*sin6); 295 sin6->sin6_family = AF_INET6; 296 sin6->sin6_port = IPSEC_PORT_ANY; 297 sin6->sin6_addr = ip6->ip6_src; 298 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 299 /* fix scope id for comparing SPD */ 300 sin6->sin6_addr.s6_addr16[1] = 0; 301 sin6->sin6_scope_id = 302 ntohs(ip6->ip6_src.s6_addr16[1]); 303 } 304 } 305 if (saidx->dst.sin6.sin6_len == 0) { 306 sin6 = (struct sockaddr_in6 *)&saidx->dst; 307 sin6->sin6_len = sizeof(*sin6); 308 sin6->sin6_family = AF_INET6; 309 sin6->sin6_port = IPSEC_PORT_ANY; 310 sin6->sin6_addr = ip6->ip6_dst; 311 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 312 /* fix scope id for comparing SPD */ 313 sin6->sin6_addr.s6_addr16[1] = 0; 314 sin6->sin6_scope_id = 315 ntohs(ip6->ip6_dst.s6_addr16[1]); 316 } 317 } 318 } 319 } 320 321 struct secasvar * 322 ipsec_lookup_sa(const struct ipsecrequest *isr, const struct mbuf *m) 323 { 324 struct secasindex saidx; 325 326 saidx = isr->saidx; 327 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 328 /* Fillin unspecified SA peers only for transport mode */ 329 ipsec_fill_saidx_bymbuf(&saidx, m, isr->saidx.dst.sa.sa_family); 330 } 331 332 return key_lookup_sa_bysaidx(&saidx); 333 } 334 335 /* 336 * ipsec_nextisr can return : 337 * - isr == NULL and error != 0 => something is bad : the packet must be 338 * discarded 339 * - isr == NULL and error == 0 => no more rules to apply, ipsec processing 340 * is done, reinject it in ip stack 341 * - isr != NULL (error == 0) => we need to apply one rule to the packet 342 */ 343 static const struct ipsecrequest * 344 ipsec_nextisr(struct mbuf *m, const struct ipsecrequest *isr, int af, 345 int *error, struct secasvar **ret) 346 { 347 #define IPSEC_OSTAT(type) \ 348 do { \ 349 switch (isr->saidx.proto) { \ 350 case IPPROTO_ESP: \ 351 ESP_STATINC(ESP_STAT_ ## type); \ 352 break; \ 353 case IPPROTO_AH: \ 354 AH_STATINC(AH_STAT_ ## type); \ 355 break; \ 356 default: \ 357 IPCOMP_STATINC(IPCOMP_STAT_ ## type); \ 358 break; \ 359 } \ 360 } while (/*CONSTCOND*/0) 361 362 struct secasvar *sav = NULL; 363 struct secasindex saidx; 364 365 KASSERTMSG(af == AF_INET || af == AF_INET6, 366 "invalid address family %u", af); 367 again: 368 /* 369 * Craft SA index to search for proper SA. Note that 370 * we only fillin unspecified SA peers for transport 371 * mode; for tunnel mode they must already be filled in. 372 */ 373 saidx = isr->saidx; 374 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 375 /* Fillin unspecified SA peers only for transport mode */ 376 ipsec_fill_saidx_bymbuf(&saidx, m, af); 377 } 378 379 /* 380 * Lookup SA and validate it. 381 */ 382 *error = key_checkrequest(isr, &saidx, &sav); 383 if (*error != 0) { 384 /* 385 * IPsec processing is required, but no SA found. 386 * I assume that key_acquire() had been called 387 * to get/establish the SA. Here I discard 388 * this packet because it is responsibility for 389 * upper layer to retransmit the packet. 390 */ 391 IPSEC_STATINC(IPSEC_STAT_OUT_NOSA); 392 goto bad; 393 } 394 /* sav may be NULL here if we have an USE rule */ 395 if (sav == NULL) { 396 KASSERTMSG(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 397 "no SA found, but required; level %u", 398 ipsec_get_reqlevel(isr)); 399 isr = isr->next; 400 /* 401 * No more rules to apply, return NULL isr and no error. 402 * It can happen when the last rules are USE rules. 403 */ 404 if (isr == NULL) { 405 *ret = NULL; 406 *error = 0; 407 return isr; 408 } 409 goto again; 410 } 411 412 /* 413 * Check system global policy controls. 414 */ 415 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 416 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 417 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 418 IPSECLOG(LOG_DEBUG, "IPsec outbound packet dropped due" 419 " to policy (check your sysctls)\n"); 420 IPSEC_OSTAT(PDROPS); 421 *error = EHOSTUNREACH; 422 KEY_SA_UNREF(&sav); 423 goto bad; 424 } 425 426 /* 427 * Sanity check the SA contents for the caller 428 * before they invoke the xform output method. 429 */ 430 KASSERT(sav->tdb_xform != NULL); 431 *ret = sav; 432 return isr; 433 434 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, const struct ipsecrequest *isr, 446 u_long *mtu) 447 { 448 struct secasvar *sav = NULL; 449 struct ip *ip; 450 int s, error, i, off; 451 union sockaddr_union *dst; 452 int setdf; 453 454 KASSERT(m != NULL); 455 KASSERT(m->m_nextpkt == NULL); 456 KASSERT(isr != NULL); 457 458 s = splsoftnet(); /* insure SA contents don't change */ 459 460 isr = ipsec_nextisr(m, isr, AF_INET, &error, &sav); 461 if (isr == NULL) { 462 if (error != 0) { 463 goto bad; 464 } else { 465 if (ipsec_register_done(m, &error) < 0) 466 goto bad; 467 468 splx(s); 469 return ipsec_reinject_ipstack(m, AF_INET); 470 } 471 } 472 KASSERT(sav != NULL); 473 474 if (m->m_len < sizeof(struct ip) && 475 (m = m_pullup(m, sizeof(struct ip))) == NULL) { 476 error = ENOBUFS; 477 goto unrefsav; 478 } 479 480 /* 481 * Check if we need to handle NAT-T fragmentation. 482 */ 483 if (isr == isr->sp->req) { /* Check only if called from ipsec4_output */ 484 KASSERT(mtu != NULL); 485 ip = mtod(m, struct ip *); 486 if (!(sav->natt_type & UDP_ENCAP_ESPINUDP)) { 487 goto noneed; 488 } 489 if (ntohs(ip->ip_len) <= sav->esp_frag) 490 goto noneed; 491 *mtu = sav->esp_frag; 492 KEY_SA_UNREF(&sav); 493 splx(s); 494 return 0; 495 } 496 noneed: 497 dst = &sav->sah->saidx.dst; 498 499 /* 500 * Collect IP_DF state from the outer header. 501 */ 502 if (dst->sa.sa_family == AF_INET) { 503 ip = mtod(m, struct ip *); 504 /* Honor system-wide control of how to handle IP_DF */ 505 switch (ip4_ipsec_dfbit) { 506 case 0: /* clear in outer header */ 507 case 1: /* set in outer header */ 508 setdf = ip4_ipsec_dfbit; 509 break; 510 default: /* propagate to outer header */ 511 setdf = ip->ip_off; 512 setdf = ntohs(setdf); 513 setdf = htons(setdf & IP_DF); 514 break; 515 } 516 } else { 517 ip = NULL; /* keep compiler happy */ 518 setdf = 0; 519 } 520 521 /* Do the appropriate encapsulation, if necessary */ 522 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 523 dst->sa.sa_family != AF_INET || /* PF mismatch */ 524 (dst->sa.sa_family == AF_INET && /* Proxy */ 525 dst->sin.sin_addr.s_addr != INADDR_ANY && 526 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 527 struct mbuf *mp; 528 529 /* Fix IPv4 header checksum and length */ 530 ip = mtod(m, struct ip *); 531 ip->ip_len = htons(m->m_pkthdr.len); 532 ip->ip_sum = 0; 533 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 534 535 /* Encapsulate the packet */ 536 error = ipip_output(m, sav, &mp); 537 if (mp == NULL && !error) { 538 /* Should never happen. */ 539 IPSECLOG(LOG_DEBUG, 540 "ipip_output returns no mbuf and no error!"); 541 error = EFAULT; 542 } 543 if (error) { 544 if (mp) { 545 /* XXX: Should never happen! */ 546 m_freem(mp); 547 } 548 m = NULL; /* ipip_output() already freed it */ 549 goto unrefsav; 550 } 551 m = mp, mp = NULL; 552 553 /* 554 * ipip_output clears IP_DF in the new header. If 555 * we need to propagate IP_DF from the outer header, 556 * then we have to do it here. 557 * 558 * XXX shouldn't assume what ipip_output does. 559 */ 560 if (dst->sa.sa_family == AF_INET && setdf) { 561 if (m->m_len < sizeof(struct ip) && 562 (m = m_pullup(m, sizeof(struct ip))) == NULL) { 563 error = ENOBUFS; 564 goto unrefsav; 565 } 566 ip = mtod(m, struct ip *); 567 ip->ip_off |= htons(IP_DF); 568 } 569 } 570 571 /* 572 * Dispatch to the appropriate IPsec transform logic. The 573 * packet will be returned for transmission after crypto 574 * processing, etc. are completed. For encapsulation we 575 * bypass this call because of the explicit call done above 576 * (necessary to deal with IP_DF handling for IPv4). 577 * 578 * NB: m & sav are ``passed to caller'' who's reponsible for 579 * for reclaiming their resources. 580 */ 581 if (sav->tdb_xform->xf_type != XF_IP4) { 582 if (dst->sa.sa_family == AF_INET) { 583 ip = mtod(m, struct ip *); 584 i = ip->ip_hl << 2; 585 off = offsetof(struct ip, ip_p); 586 } else { 587 i = sizeof(struct ip6_hdr); 588 off = offsetof(struct ip6_hdr, ip6_nxt); 589 } 590 error = (*sav->tdb_xform->xf_output)(m, isr, sav, i, off); 591 } else { 592 error = ipsec_process_done(m, isr, sav); 593 } 594 KEY_SA_UNREF(&sav); 595 splx(s); 596 return error; 597 598 unrefsav: 599 KEY_SA_UNREF(&sav); 600 bad: 601 splx(s); 602 if (m) 603 m_freem(m); 604 return error; 605 } 606 #endif 607 608 #ifdef INET6 609 static int 610 compute_ipsec_pos(struct mbuf *m, int *i, int *off) 611 { 612 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 613 struct ip6_ext ip6e; 614 int dstopt = 0; 615 int nxt; 616 617 *i = sizeof(struct ip6_hdr); 618 *off = offsetof(struct ip6_hdr, ip6_nxt); 619 nxt = ip6->ip6_nxt; 620 621 /* 622 * chase mbuf chain to find the appropriate place to 623 * put AH/ESP/IPcomp header. 624 * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] 625 */ 626 while (1) { 627 switch (nxt) { 628 case IPPROTO_AH: 629 case IPPROTO_ESP: 630 case IPPROTO_IPCOMP: 631 /* 632 * We should not skip security header added 633 * beforehand. 634 */ 635 return 0; 636 637 case IPPROTO_HOPOPTS: 638 case IPPROTO_DSTOPTS: 639 case IPPROTO_ROUTING: 640 if (*i + sizeof(ip6e) > m->m_pkthdr.len) { 641 return EINVAL; 642 } 643 644 /* 645 * If we see 2nd destination option header, 646 * we should stop there. 647 */ 648 if (nxt == IPPROTO_DSTOPTS && dstopt) 649 return 0; 650 651 if (nxt == IPPROTO_DSTOPTS) { 652 /* 653 * Seen 1st or 2nd destination option. 654 * next time we see one, it must be 2nd. 655 */ 656 dstopt = 1; 657 } else if (nxt == IPPROTO_ROUTING) { 658 /* 659 * If we see destination option next 660 * time, it must be dest2. 661 */ 662 dstopt = 2; 663 } 664 665 /* skip this header */ 666 m_copydata(m, *i, sizeof(ip6e), &ip6e); 667 nxt = ip6e.ip6e_nxt; 668 *off = *i + offsetof(struct ip6_ext, ip6e_nxt); 669 *i += (ip6e.ip6e_len + 1) << 3; 670 if (*i > m->m_pkthdr.len) { 671 return EINVAL; 672 } 673 break; 674 default: 675 return 0; 676 } 677 } 678 679 return 0; 680 } 681 682 static int 683 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, 684 const struct in6_addr *ia) 685 { 686 struct in6_addr ia2; 687 688 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 689 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 690 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 691 692 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 693 } 694 695 int 696 ipsec6_process_packet(struct mbuf *m, const struct ipsecrequest *isr) 697 { 698 struct secasvar *sav = NULL; 699 struct ip6_hdr *ip6; 700 int s, error, i, off; 701 union sockaddr_union *dst; 702 703 KASSERT(m != NULL); 704 KASSERT(m->m_nextpkt == NULL); 705 KASSERT(isr != NULL); 706 707 s = splsoftnet(); /* insure SA contents don't change */ 708 709 isr = ipsec_nextisr(m, isr, AF_INET6, &error, &sav); 710 if (isr == NULL) { 711 if (error != 0) { 712 /* XXX Should we send a notification ? */ 713 goto bad; 714 } else { 715 if (ipsec_register_done(m, &error) < 0) 716 goto bad; 717 718 splx(s); 719 return ipsec_reinject_ipstack(m, AF_INET6); 720 } 721 } 722 723 KASSERT(sav != NULL); 724 dst = &sav->sah->saidx.dst; 725 726 if (m->m_len < sizeof(struct ip6_hdr)) { 727 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 728 error = ENOBUFS; 729 goto unrefsav; 730 } 731 } 732 ip6 = mtod(m, struct ip6_hdr *); 733 734 /* Do the appropriate encapsulation, if necessary */ 735 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 736 dst->sa.sa_family != AF_INET6 || /* AF mismatch */ 737 ((dst->sa.sa_family == AF_INET6) && 738 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 739 (!in6_sa_equal_addrwithscope(&dst->sin6, &ip6->ip6_dst)))) { 740 struct mbuf *mp; 741 742 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 743 /* No jumbogram support. */ 744 error = ENXIO; /*XXX*/ 745 goto unrefsav; 746 } 747 748 /* Fix IPv6 header payload length. */ 749 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 750 751 /* Encapsulate the packet */ 752 error = ipip_output(m, sav, &mp); 753 if (mp == NULL && !error) { 754 /* Should never happen. */ 755 IPSECLOG(LOG_DEBUG, 756 "ipip_output returns no mbuf and no error!"); 757 error = EFAULT; 758 } 759 760 if (error) { 761 if (mp) { 762 /* XXX: Should never happen! */ 763 m_freem(mp); 764 } 765 m = NULL; /* ipip_output() already freed it */ 766 goto unrefsav; 767 } 768 769 m = mp; 770 mp = NULL; 771 } 772 773 if (dst->sa.sa_family == AF_INET) { 774 struct ip *ip; 775 ip = mtod(m, struct ip *); 776 i = ip->ip_hl << 2; 777 off = offsetof(struct ip, ip_p); 778 } else { 779 error = compute_ipsec_pos(m, &i, &off); 780 if (error) 781 goto unrefsav; 782 } 783 error = (*sav->tdb_xform->xf_output)(m, isr, sav, i, off); 784 KEY_SA_UNREF(&sav); 785 splx(s); 786 return error; 787 788 unrefsav: 789 KEY_SA_UNREF(&sav); 790 bad: 791 splx(s); 792 if (m) 793 m_freem(m); 794 return error; 795 } 796 #endif /* INET6 */ 797 798 void 799 ipsec_output_init(void) 800 { 801 802 ipsec_rtcache_percpu = percpu_alloc(sizeof(struct route)); 803 } 804
Indexes created Wed Sep 24 05:09:52 GMT 2025