Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netinet6/esp_input.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $FreeBSD$ */ 2 /* $KAME: esp_input.c,v 1.62 2002/01/07 11:39:57 kjc Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * RFC1827/2406 Encapsulated Security Payload. 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mbuf.h> 43 #include <sys/domain.h> 44 #include <sys/protosw.h> 45 #include <sys/socket.h> 46 #include <sys/errno.h> 47 #include <sys/time.h> 48 #include <sys/syslog.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 #include <net/netisr.h> 53 #include <machine/cpu.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 #include <netinet/ip.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/in_var.h> 60 #include <netinet/ip_ecn.h> 61 #ifdef INET6 62 #include <netinet6/ip6_ecn.h> 63 #endif 64 65 #ifdef INET6 66 #include <netinet/ip6.h> 67 #include <netinet6/in6_pcb.h> 68 #include <netinet6/ip6_var.h> 69 #include <netinet/icmp6.h> 70 #include <netinet6/ip6protosw.h> 71 #endif 72 73 #include <netinet6/ipsec.h> 74 #ifdef INET6 75 #include <netinet6/ipsec6.h> 76 #endif 77 #include <netinet6/ah.h> 78 #ifdef INET6 79 #include <netinet6/ah6.h> 80 #endif 81 #include <netinet6/esp.h> 82 #ifdef INET6 83 #include <netinet6/esp6.h> 84 #endif 85 #include <netkey/key.h> 86 #include <netkey/keydb.h> 87 #include <netkey/key_debug.h> 88 89 #include <machine/stdarg.h> 90 91 #include <net/net_osdep.h> 92 93 #define IPLEN_FLIPPED 94 95 #define ESPMAXLEN \ 96 (sizeof(struct esp) < sizeof(struct newesp) \ 97 ? sizeof(struct newesp) : sizeof(struct esp)) 98 99 #ifdef INET 100 #include <netinet/ipprotosw.h> 101 extern struct ipprotosw inetsw[]; 102 103 void 104 #if __STDC__ 105 esp4_input(struct mbuf *m, ...) 106 #else 107 esp4_input(m, va_alist) 108 struct mbuf *m; 109 va_dcl 110 #endif 111 { 112 struct ip *ip; 113 struct esp *esp; 114 struct esptail esptail; 115 u_int32_t spi; 116 struct secasvar *sav = NULL; 117 size_t taillen; 118 u_int16_t nxt; 119 const struct esp_algorithm *algo; 120 int ivlen; 121 size_t hlen; 122 size_t esplen; 123 int s; 124 va_list ap; 125 int off, proto; 126 127 va_start(ap, m); 128 off = va_arg(ap, int); 129 proto = va_arg(ap, int); 130 va_end(ap); 131 132 /* sanity check for alignment. */ 133 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { 134 ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem " 135 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); 136 ipsecstat.in_inval++; 137 goto bad; 138 } 139 140 if (m->m_len < off + ESPMAXLEN) { 141 m = m_pullup(m, off + ESPMAXLEN); 142 if (!m) { 143 ipseclog((LOG_DEBUG, 144 "IPv4 ESP input: can't pullup in esp4_input\n")); 145 ipsecstat.in_inval++; 146 goto bad; 147 } 148 } 149 150 ip = mtod(m, struct ip *); 151 esp = (struct esp *)(((u_int8_t *)ip) + off); 152 #ifdef _IP_VHL 153 hlen = IP_VHL_HL(ip->ip_vhl) << 2; 154 #else 155 hlen = ip->ip_hl << 2; 156 #endif 157 158 /* find the sassoc. */ 159 spi = esp->esp_spi; 160 161 if ((sav = key_allocsa(AF_INET, 162 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst, 163 IPPROTO_ESP, spi)) == 0) { 164 ipseclog((LOG_WARNING, 165 "IPv4 ESP input: no key association found for spi %u\n", 166 (u_int32_t)ntohl(spi))); 167 ipsecstat.in_nosa++; 168 goto bad; 169 } 170 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 171 printf("DP esp4_input called to allocate SA:%p\n", sav)); 172 if (sav->state != SADB_SASTATE_MATURE 173 && sav->state != SADB_SASTATE_DYING) { 174 ipseclog((LOG_DEBUG, 175 "IPv4 ESP input: non-mature/dying SA found for spi %u\n", 176 (u_int32_t)ntohl(spi))); 177 ipsecstat.in_badspi++; 178 goto bad; 179 } 180 algo = esp_algorithm_lookup(sav->alg_enc); 181 if (!algo) { 182 ipseclog((LOG_DEBUG, "IPv4 ESP input: " 183 "unsupported encryption algorithm for spi %u\n", 184 (u_int32_t)ntohl(spi))); 185 ipsecstat.in_badspi++; 186 goto bad; 187 } 188 189 /* check if we have proper ivlen information */ 190 ivlen = sav->ivlen; 191 if (ivlen < 0) { 192 ipseclog((LOG_ERR, "inproper ivlen in IPv4 ESP input: %s %s\n", 193 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 194 ipsecstat.in_inval++; 195 goto bad; 196 } 197 198 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay 199 && (sav->alg_auth && sav->key_auth))) 200 goto noreplaycheck; 201 202 if (sav->alg_auth == SADB_X_AALG_NULL || 203 sav->alg_auth == SADB_AALG_NONE) 204 goto noreplaycheck; 205 206 /* 207 * check for sequence number. 208 */ 209 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) 210 ; /* okey */ 211 else { 212 ipsecstat.in_espreplay++; 213 ipseclog((LOG_WARNING, 214 "replay packet in IPv4 ESP input: %s %s\n", 215 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 216 goto bad; 217 } 218 219 /* check ICV */ 220 { 221 u_char sum0[AH_MAXSUMSIZE]; 222 u_char sum[AH_MAXSUMSIZE]; 223 const struct ah_algorithm *sumalgo; 224 size_t siz; 225 226 sumalgo = ah_algorithm_lookup(sav->alg_auth); 227 if (!sumalgo) 228 goto noreplaycheck; 229 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); 230 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) { 231 ipsecstat.in_inval++; 232 goto bad; 233 } 234 if (AH_MAXSUMSIZE < siz) { 235 ipseclog((LOG_DEBUG, 236 "internal error: AH_MAXSUMSIZE must be larger than %lu\n", 237 (u_long)siz)); 238 ipsecstat.in_inval++; 239 goto bad; 240 } 241 242 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); 243 244 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { 245 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", 246 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 247 ipsecstat.in_espauthfail++; 248 goto bad; 249 } 250 251 if (bcmp(sum0, sum, siz) != 0) { 252 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", 253 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 254 ipsecstat.in_espauthfail++; 255 goto bad; 256 } 257 258 /* strip off the authentication data */ 259 m_adj(m, -siz); 260 ip = mtod(m, struct ip *); 261 #ifdef IPLEN_FLIPPED 262 ip->ip_len = ip->ip_len - siz; 263 #else 264 ip->ip_len = htons(ntohs(ip->ip_len) - siz); 265 #endif 266 m->m_flags |= M_AUTHIPDGM; 267 ipsecstat.in_espauthsucc++; 268 } 269 270 /* 271 * update sequence number. 272 */ 273 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { 274 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { 275 ipsecstat.in_espreplay++; 276 goto bad; 277 } 278 } 279 280 noreplaycheck: 281 282 /* process main esp header. */ 283 if (sav->flags & SADB_X_EXT_OLD) { 284 /* RFC 1827 */ 285 esplen = sizeof(struct esp); 286 } else { 287 /* RFC 2406 */ 288 if (sav->flags & SADB_X_EXT_DERIV) 289 esplen = sizeof(struct esp); 290 else 291 esplen = sizeof(struct newesp); 292 } 293 294 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { 295 ipseclog((LOG_WARNING, 296 "IPv4 ESP input: packet too short\n")); 297 ipsecstat.in_inval++; 298 goto bad; 299 } 300 301 if (m->m_len < off + esplen + ivlen) { 302 m = m_pullup(m, off + esplen + ivlen); 303 if (!m) { 304 ipseclog((LOG_DEBUG, 305 "IPv4 ESP input: can't pullup in esp4_input\n")); 306 ipsecstat.in_inval++; 307 goto bad; 308 } 309 } 310 311 /* 312 * pre-compute and cache intermediate key 313 */ 314 if (esp_schedule(algo, sav) != 0) { 315 ipsecstat.in_inval++; 316 goto bad; 317 } 318 319 /* 320 * decrypt the packet. 321 */ 322 if (!algo->decrypt) 323 panic("internal error: no decrypt function"); 324 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { 325 /* m is already freed */ 326 m = NULL; 327 ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n", 328 ipsec_logsastr(sav))); 329 ipsecstat.in_inval++; 330 goto bad; 331 } 332 ipsecstat.in_esphist[sav->alg_enc]++; 333 334 m->m_flags |= M_DECRYPTED; 335 336 /* 337 * find the trailer of the ESP. 338 */ 339 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), 340 (caddr_t)&esptail); 341 nxt = esptail.esp_nxt; 342 taillen = esptail.esp_padlen + sizeof(esptail); 343 344 if (m->m_pkthdr.len < taillen 345 || m->m_pkthdr.len - taillen < hlen) { /* ? */ 346 ipseclog((LOG_WARNING, 347 "bad pad length in IPv4 ESP input: %s %s\n", 348 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 349 ipsecstat.in_inval++; 350 goto bad; 351 } 352 353 /* strip off the trailing pad area. */ 354 m_adj(m, -taillen); 355 356 #ifdef IPLEN_FLIPPED 357 ip->ip_len = ip->ip_len - taillen; 358 #else 359 ip->ip_len = htons(ntohs(ip->ip_len) - taillen); 360 #endif 361 362 /* was it transmitted over the IPsec tunnel SA? */ 363 if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { 364 /* 365 * strip off all the headers that precedes ESP header. 366 * IP4 xx ESP IP4' payload -> IP4' payload 367 * 368 * XXX more sanity checks 369 * XXX relationship with gif? 370 */ 371 u_int8_t tos; 372 373 tos = ip->ip_tos; 374 m_adj(m, off + esplen + ivlen); 375 if (m->m_len < sizeof(*ip)) { 376 m = m_pullup(m, sizeof(*ip)); 377 if (!m) { 378 ipsecstat.in_inval++; 379 goto bad; 380 } 381 } 382 ip = mtod(m, struct ip *); 383 /* ECN consideration. */ 384 ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos); 385 if (!key_checktunnelsanity(sav, AF_INET, 386 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) { 387 ipseclog((LOG_ERR, "ipsec tunnel address mismatch " 388 "in IPv4 ESP input: %s %s\n", 389 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 390 ipsecstat.in_inval++; 391 goto bad; 392 } 393 394 key_sa_recordxfer(sav, m); 395 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || 396 ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) { 397 ipsecstat.in_nomem++; 398 goto bad; 399 } 400 401 s = splimp(); 402 if (IF_QFULL(&ipintrq)) { 403 ipsecstat.in_inval++; 404 splx(s); 405 goto bad; 406 } 407 IF_ENQUEUE(&ipintrq, m); 408 m = NULL; 409 schednetisr(NETISR_IP); /* can be skipped but to make sure */ 410 splx(s); 411 nxt = IPPROTO_DONE; 412 } else { 413 /* 414 * strip off ESP header and IV. 415 * even in m_pulldown case, we need to strip off ESP so that 416 * we can always compute checksum for AH correctly. 417 */ 418 size_t stripsiz; 419 420 stripsiz = esplen + ivlen; 421 422 ip = mtod(m, struct ip *); 423 ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off); 424 m->m_data += stripsiz; 425 m->m_len -= stripsiz; 426 m->m_pkthdr.len -= stripsiz; 427 428 ip = mtod(m, struct ip *); 429 #ifdef IPLEN_FLIPPED 430 ip->ip_len = ip->ip_len - stripsiz; 431 #else 432 ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz); 433 #endif 434 ip->ip_p = nxt; 435 436 key_sa_recordxfer(sav, m); 437 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { 438 ipsecstat.in_nomem++; 439 goto bad; 440 } 441 442 if (nxt != IPPROTO_DONE) { 443 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 444 ipsec4_in_reject(m, NULL)) { 445 ipsecstat.in_polvio++; 446 goto bad; 447 } 448 (*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt); 449 } else 450 m_freem(m); 451 m = NULL; 452 } 453 454 if (sav) { 455 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 456 printf("DP esp4_input call free SA:%p\n", sav)); 457 key_freesav(sav); 458 } 459 ipsecstat.in_success++; 460 return; 461 462 bad: 463 if (sav) { 464 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 465 printf("DP esp4_input call free SA:%p\n", sav)); 466 key_freesav(sav); 467 } 468 if (m) 469 m_freem(m); 470 return; 471 } 472 #endif /* INET */ 473 474 #ifdef INET6 475 int 476 esp6_input(mp, offp, proto) 477 struct mbuf **mp; 478 int *offp, proto; 479 { 480 struct mbuf *m = *mp; 481 int off = *offp; 482 struct ip6_hdr *ip6; 483 struct esp *esp; 484 struct esptail esptail; 485 u_int32_t spi; 486 struct secasvar *sav = NULL; 487 size_t taillen; 488 u_int16_t nxt; 489 const struct esp_algorithm *algo; 490 int ivlen; 491 size_t esplen; 492 int s; 493 494 /* sanity check for alignment. */ 495 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { 496 ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem " 497 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); 498 ipsec6stat.in_inval++; 499 goto bad; 500 } 501 502 #ifndef PULLDOWN_TEST 503 IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE); 504 esp = (struct esp *)(mtod(m, caddr_t) + off); 505 #else 506 IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN); 507 if (esp == NULL) { 508 ipsec6stat.in_inval++; 509 return IPPROTO_DONE; 510 } 511 #endif 512 ip6 = mtod(m, struct ip6_hdr *); 513 514 if (ntohs(ip6->ip6_plen) == 0) { 515 ipseclog((LOG_ERR, "IPv6 ESP input: " 516 "ESP with IPv6 jumbogram is not supported.\n")); 517 ipsec6stat.in_inval++; 518 goto bad; 519 } 520 521 /* find the sassoc. */ 522 spi = esp->esp_spi; 523 524 if ((sav = key_allocsa(AF_INET6, 525 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst, 526 IPPROTO_ESP, spi)) == 0) { 527 ipseclog((LOG_WARNING, 528 "IPv6 ESP input: no key association found for spi %u\n", 529 (u_int32_t)ntohl(spi))); 530 ipsec6stat.in_nosa++; 531 goto bad; 532 } 533 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 534 printf("DP esp6_input called to allocate SA:%p\n", sav)); 535 if (sav->state != SADB_SASTATE_MATURE 536 && sav->state != SADB_SASTATE_DYING) { 537 ipseclog((LOG_DEBUG, 538 "IPv6 ESP input: non-mature/dying SA found for spi %u\n", 539 (u_int32_t)ntohl(spi))); 540 ipsec6stat.in_badspi++; 541 goto bad; 542 } 543 algo = esp_algorithm_lookup(sav->alg_enc); 544 if (!algo) { 545 ipseclog((LOG_DEBUG, "IPv6 ESP input: " 546 "unsupported encryption algorithm for spi %u\n", 547 (u_int32_t)ntohl(spi))); 548 ipsec6stat.in_badspi++; 549 goto bad; 550 } 551 552 /* check if we have proper ivlen information */ 553 ivlen = sav->ivlen; 554 if (ivlen < 0) { 555 ipseclog((LOG_ERR, "inproper ivlen in IPv6 ESP input: %s %s\n", 556 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 557 ipsec6stat.in_badspi++; 558 goto bad; 559 } 560 561 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay 562 && (sav->alg_auth && sav->key_auth))) 563 goto noreplaycheck; 564 565 if (sav->alg_auth == SADB_X_AALG_NULL || 566 sav->alg_auth == SADB_AALG_NONE) 567 goto noreplaycheck; 568 569 /* 570 * check for sequence number. 571 */ 572 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) 573 ; /* okey */ 574 else { 575 ipsec6stat.in_espreplay++; 576 ipseclog((LOG_WARNING, 577 "replay packet in IPv6 ESP input: %s %s\n", 578 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 579 goto bad; 580 } 581 582 /* check ICV */ 583 { 584 u_char sum0[AH_MAXSUMSIZE]; 585 u_char sum[AH_MAXSUMSIZE]; 586 const struct ah_algorithm *sumalgo; 587 size_t siz; 588 589 sumalgo = ah_algorithm_lookup(sav->alg_auth); 590 if (!sumalgo) 591 goto noreplaycheck; 592 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); 593 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) { 594 ipsec6stat.in_inval++; 595 goto bad; 596 } 597 if (AH_MAXSUMSIZE < siz) { 598 ipseclog((LOG_DEBUG, 599 "internal error: AH_MAXSUMSIZE must be larger than %lu\n", 600 (u_long)siz)); 601 ipsec6stat.in_inval++; 602 goto bad; 603 } 604 605 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); 606 607 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { 608 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", 609 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 610 ipsec6stat.in_espauthfail++; 611 goto bad; 612 } 613 614 if (bcmp(sum0, sum, siz) != 0) { 615 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", 616 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 617 ipsec6stat.in_espauthfail++; 618 goto bad; 619 } 620 621 /* strip off the authentication data */ 622 m_adj(m, -siz); 623 ip6 = mtod(m, struct ip6_hdr *); 624 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz); 625 626 m->m_flags |= M_AUTHIPDGM; 627 ipsec6stat.in_espauthsucc++; 628 } 629 630 /* 631 * update sequence number. 632 */ 633 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { 634 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { 635 ipsec6stat.in_espreplay++; 636 goto bad; 637 } 638 } 639 640 noreplaycheck: 641 642 /* process main esp header. */ 643 if (sav->flags & SADB_X_EXT_OLD) { 644 /* RFC 1827 */ 645 esplen = sizeof(struct esp); 646 } else { 647 /* RFC 2406 */ 648 if (sav->flags & SADB_X_EXT_DERIV) 649 esplen = sizeof(struct esp); 650 else 651 esplen = sizeof(struct newesp); 652 } 653 654 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { 655 ipseclog((LOG_WARNING, 656 "IPv6 ESP input: packet too short\n")); 657 ipsec6stat.in_inval++; 658 goto bad; 659 } 660 661 #ifndef PULLDOWN_TEST 662 IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /* XXX */ 663 #else 664 IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen); 665 if (esp == NULL) { 666 ipsec6stat.in_inval++; 667 m = NULL; 668 goto bad; 669 } 670 #endif 671 ip6 = mtod(m, struct ip6_hdr *); /* set it again just in case */ 672 673 /* 674 * pre-compute and cache intermediate key 675 */ 676 if (esp_schedule(algo, sav) != 0) { 677 ipsec6stat.in_inval++; 678 goto bad; 679 } 680 681 /* 682 * decrypt the packet. 683 */ 684 if (!algo->decrypt) 685 panic("internal error: no decrypt function"); 686 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { 687 /* m is already freed */ 688 m = NULL; 689 ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n", 690 ipsec_logsastr(sav))); 691 ipsec6stat.in_inval++; 692 goto bad; 693 } 694 ipsec6stat.in_esphist[sav->alg_enc]++; 695 696 m->m_flags |= M_DECRYPTED; 697 698 /* 699 * find the trailer of the ESP. 700 */ 701 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), 702 (caddr_t)&esptail); 703 nxt = esptail.esp_nxt; 704 taillen = esptail.esp_padlen + sizeof(esptail); 705 706 if (m->m_pkthdr.len < taillen 707 || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /* ? */ 708 ipseclog((LOG_WARNING, 709 "bad pad length in IPv6 ESP input: %s %s\n", 710 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 711 ipsec6stat.in_inval++; 712 goto bad; 713 } 714 715 /* strip off the trailing pad area. */ 716 m_adj(m, -taillen); 717 718 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen); 719 720 /* was it transmitted over the IPsec tunnel SA? */ 721 if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { 722 /* 723 * strip off all the headers that precedes ESP header. 724 * IP6 xx ESP IP6' payload -> IP6' payload 725 * 726 * XXX more sanity checks 727 * XXX relationship with gif? 728 */ 729 u_int32_t flowinfo; /* net endian */ 730 flowinfo = ip6->ip6_flow; 731 m_adj(m, off + esplen + ivlen); 732 if (m->m_len < sizeof(*ip6)) { 733 #ifndef PULLDOWN_TEST 734 /* 735 * m_pullup is prohibited in KAME IPv6 input processing 736 * but there's no other way! 737 */ 738 #else 739 /* okay to pullup in m_pulldown style */ 740 #endif 741 m = m_pullup(m, sizeof(*ip6)); 742 if (!m) { 743 ipsec6stat.in_inval++; 744 goto bad; 745 } 746 } 747 ip6 = mtod(m, struct ip6_hdr *); 748 /* ECN consideration. */ 749 ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow); 750 if (!key_checktunnelsanity(sav, AF_INET6, 751 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) { 752 ipseclog((LOG_ERR, "ipsec tunnel address mismatch " 753 "in IPv6 ESP input: %s %s\n", 754 ipsec6_logpacketstr(ip6, spi), 755 ipsec_logsastr(sav))); 756 ipsec6stat.in_inval++; 757 goto bad; 758 } 759 760 key_sa_recordxfer(sav, m); 761 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || 762 ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) { 763 ipsec6stat.in_nomem++; 764 goto bad; 765 } 766 767 s = splimp(); 768 if (IF_QFULL(&ip6intrq)) { 769 ipsec6stat.in_inval++; 770 splx(s); 771 goto bad; 772 } 773 IF_ENQUEUE(&ip6intrq, m); 774 m = NULL; 775 schednetisr(NETISR_IPV6); /* can be skipped but to make sure */ 776 splx(s); 777 nxt = IPPROTO_DONE; 778 } else { 779 /* 780 * strip off ESP header and IV. 781 * even in m_pulldown case, we need to strip off ESP so that 782 * we can always compute checksum for AH correctly. 783 */ 784 size_t stripsiz; 785 char *prvnxtp; 786 787 /* 788 * Set the next header field of the previous header correctly. 789 */ 790 prvnxtp = ip6_get_prevhdr(m, off); /* XXX */ 791 *prvnxtp = nxt; 792 793 stripsiz = esplen + ivlen; 794 795 ip6 = mtod(m, struct ip6_hdr *); 796 if (m->m_len >= stripsiz + off) { 797 ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off); 798 m->m_data += stripsiz; 799 m->m_len -= stripsiz; 800 m->m_pkthdr.len -= stripsiz; 801 } else { 802 /* 803 * this comes with no copy if the boundary is on 804 * cluster 805 */ 806 struct mbuf *n; 807 808 n = m_split(m, off, M_DONTWAIT); 809 if (n == NULL) { 810 /* m is retained by m_split */ 811 goto bad; 812 } 813 m_adj(n, stripsiz); 814 m_cat(m, n); 815 /* m_cat does not update m_pkthdr.len */ 816 m->m_pkthdr.len += n->m_pkthdr.len; 817 } 818 819 #ifndef PULLDOWN_TEST 820 /* 821 * KAME requires that the packet to be contiguous on the 822 * mbuf. We need to make that sure. 823 * this kind of code should be avoided. 824 * XXX other conditions to avoid running this part? 825 */ 826 if (m->m_len != m->m_pkthdr.len) { 827 struct mbuf *n = NULL; 828 int maxlen; 829 830 MGETHDR(n, M_DONTWAIT, MT_HEADER); 831 maxlen = MHLEN; 832 if (n) 833 M_MOVE_PKTHDR(n, m); 834 if (n && n->m_pkthdr.len > maxlen) { 835 MCLGET(n, M_DONTWAIT); 836 maxlen = MCLBYTES; 837 if ((n->m_flags & M_EXT) == 0) { 838 m_free(n); 839 n = NULL; 840 } 841 } 842 if (!n) { 843 printf("esp6_input: mbuf allocation failed\n"); 844 goto bad; 845 } 846 847 if (n->m_pkthdr.len <= maxlen) { 848 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 849 n->m_len = n->m_pkthdr.len; 850 n->m_next = NULL; 851 m_freem(m); 852 } else { 853 m_copydata(m, 0, maxlen, mtod(n, caddr_t)); 854 n->m_len = maxlen; 855 n->m_next = m; 856 m_adj(m, maxlen); 857 } 858 m = n; 859 } 860 #endif 861 862 ip6 = mtod(m, struct ip6_hdr *); 863 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz); 864 865 key_sa_recordxfer(sav, m); 866 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { 867 ipsec6stat.in_nomem++; 868 goto bad; 869 } 870 } 871 872 *offp = off; 873 *mp = m; 874 875 if (sav) { 876 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 877 printf("DP esp6_input call free SA:%p\n", sav)); 878 key_freesav(sav); 879 } 880 ipsec6stat.in_success++; 881 return nxt; 882 883 bad: 884 if (sav) { 885 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 886 printf("DP esp6_input call free SA:%p\n", sav)); 887 key_freesav(sav); 888 } 889 if (m) 890 m_freem(m); 891 return IPPROTO_DONE; 892 } 893 894 void 895 esp6_ctlinput(cmd, sa, d) 896 int cmd; 897 struct sockaddr *sa; 898 void *d; 899 { 900 const struct newesp *espp; 901 struct newesp esp; 902 struct ip6ctlparam *ip6cp = NULL, ip6cp1; 903 struct secasvar *sav; 904 struct ip6_hdr *ip6; 905 struct mbuf *m; 906 int off; 907 struct sockaddr_in6 *sa6_src, *sa6_dst; 908 909 if (sa->sa_family != AF_INET6 || 910 sa->sa_len != sizeof(struct sockaddr_in6)) 911 return; 912 if ((unsigned)cmd >= PRC_NCMDS) 913 return; 914 915 /* if the parameter is from icmp6, decode it. */ 916 if (d != NULL) { 917 ip6cp = (struct ip6ctlparam *)d; 918 m = ip6cp->ip6c_m; 919 ip6 = ip6cp->ip6c_ip6; 920 off = ip6cp->ip6c_off; 921 } else { 922 m = NULL; 923 ip6 = NULL; 924 } 925 926 if (ip6) { 927 /* 928 * Notify the error to all possible sockets via pfctlinput2. 929 * Since the upper layer information (such as protocol type, 930 * source and destination ports) is embedded in the encrypted 931 * data and might have been cut, we can't directly call 932 * an upper layer ctlinput function. However, the pcbnotify 933 * function will consider source and destination addresses 934 * as well as the flow info value, and may be able to find 935 * some PCB that should be notified. 936 * Although pfctlinput2 will call esp6_ctlinput(), there is 937 * no possibility of an infinite loop of function calls, 938 * because we don't pass the inner IPv6 header. 939 */ 940 bzero(&ip6cp1, sizeof(ip6cp1)); 941 ip6cp1.ip6c_src = ip6cp->ip6c_src; 942 pfctlinput2(cmd, sa, (void *)&ip6cp1); 943 944 /* 945 * Then go to special cases that need ESP header information. 946 * XXX: We assume that when ip6 is non NULL, 947 * M and OFF are valid. 948 */ 949 950 /* check if we can safely examine src and dst ports */ 951 if (m->m_pkthdr.len < off + sizeof(esp)) 952 return; 953 954 if (m->m_len < off + sizeof(esp)) { 955 /* 956 * this should be rare case, 957 * so we compromise on this copy... 958 */ 959 m_copydata(m, off, sizeof(esp), (caddr_t)&esp); 960 espp = &esp; 961 } else 962 espp = (struct newesp*)(mtod(m, caddr_t) + off); 963 964 if (cmd == PRC_MSGSIZE) { 965 int valid = 0; 966 967 /* 968 * Check to see if we have a valid SA corresponding to 969 * the address in the ICMP message payload. 970 */ 971 sa6_src = ip6cp->ip6c_src; 972 sa6_dst = (struct sockaddr_in6 *)sa; 973 sav = key_allocsa(AF_INET6, 974 (caddr_t)&sa6_src->sin6_addr, 975 (caddr_t)&sa6_dst->sin6_addr, 976 IPPROTO_ESP, espp->esp_spi); 977 if (sav) { 978 if (sav->state == SADB_SASTATE_MATURE || 979 sav->state == SADB_SASTATE_DYING) 980 valid++; 981 key_freesav(sav); 982 } 983 984 /* XXX Further validation? */ 985 986 /* 987 * Depending on the value of "valid" and routing table 988 * size (mtudisc_{hi,lo}wat), we will: 989 * - recalcurate the new MTU and create the 990 * corresponding routing entry, or 991 * - ignore the MTU change notification. 992 */ 993 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 994 } 995 } else { 996 /* we normally notify any pcb here */ 997 } 998 } 999 #endif /* INET6 */
Cache object: abec6d7f9078642503701276453c26a5
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]