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sys/netinet6/esp_input.c
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1 /* $FreeBSD: src/sys/netinet6/esp_input.c,v 1.1.2.8 2003/01/23 21:06:47 sam Exp $ */ 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 <sys/thread2.h> 51 #include <sys/msgport2.h> 52 53 #include <net/if.h> 54 #include <net/route.h> 55 #include <net/netisr.h> 56 #include <machine/cpu.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/ip.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/in_var.h> 63 #include <netinet/ip_ecn.h> 64 #ifdef INET6 65 #include <netinet6/ip6_ecn.h> 66 #endif 67 68 #ifdef INET6 69 #include <netinet/ip6.h> 70 #include <netinet6/in6_pcb.h> 71 #include <netinet6/ip6_var.h> 72 #include <netinet/icmp6.h> 73 #include <netinet6/ip6protosw.h> 74 #endif 75 76 #include <netinet6/ipsec.h> 77 #ifdef INET6 78 #include <netinet6/ipsec6.h> 79 #endif 80 #include <netinet6/ah.h> 81 #ifdef INET6 82 #include <netinet6/ah6.h> 83 #endif 84 #include <netinet6/esp.h> 85 #ifdef INET6 86 #include <netinet6/esp6.h> 87 #endif 88 #include <netproto/key/key.h> 89 #include <netproto/key/keydb.h> 90 #include <netproto/key/key_debug.h> 91 92 #include <machine/stdarg.h> 93 94 #include <net/net_osdep.h> 95 96 #define IPLEN_FLIPPED 97 98 #define ESPMAXLEN \ 99 (sizeof(struct esp) < sizeof(struct newesp) \ 100 ? sizeof(struct newesp) : sizeof(struct esp)) 101 102 #ifdef INET 103 extern struct protosw inetsw[]; 104 105 int 106 esp4_input(struct mbuf **mp, int *offp, int proto) 107 { 108 int off; 109 struct ip *ip; 110 struct esp *esp; 111 struct esptail esptail; 112 struct mbuf *m; 113 u_int32_t spi; 114 struct secasvar *sav = NULL; 115 size_t taillen; 116 u_int16_t nxt; 117 const struct esp_algorithm *algo; 118 int ivlen; 119 size_t esplen; 120 121 off = *offp; 122 m = *mp; 123 *mp = NULL; 124 125 /* sanity check for alignment. */ 126 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { 127 ipseclog((LOG_ERR, "IPv4 ESP input: packet alignment problem " 128 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); 129 ipsecstat.in_inval++; 130 goto bad; 131 } 132 133 if (m->m_len < off + ESPMAXLEN) { 134 m = m_pullup(m, off + ESPMAXLEN); 135 if (!m) { 136 ipseclog((LOG_DEBUG, 137 "IPv4 ESP input: can't pullup in esp4_input\n")); 138 ipsecstat.in_inval++; 139 goto bad; 140 } 141 } 142 143 ip = mtod(m, struct ip *); 144 esp = (struct esp *)(((u_int8_t *)ip) + off); 145 146 /* find the sassoc. */ 147 spi = esp->esp_spi; 148 149 if ((sav = key_allocsa(AF_INET, 150 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst, 151 IPPROTO_ESP, spi)) == NULL) { 152 ipseclog((LOG_WARNING, 153 "IPv4 ESP input: no key association found for spi %u\n", 154 (u_int32_t)ntohl(spi))); 155 ipsecstat.in_nosa++; 156 goto bad; 157 } 158 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 159 kprintf("DP esp4_input called to allocate SA:%p\n", sav)); 160 if (sav->state != SADB_SASTATE_MATURE 161 && sav->state != SADB_SASTATE_DYING) { 162 ipseclog((LOG_DEBUG, 163 "IPv4 ESP input: non-mature/dying SA found for spi %u\n", 164 (u_int32_t)ntohl(spi))); 165 ipsecstat.in_badspi++; 166 goto bad; 167 } 168 algo = esp_algorithm_lookup(sav->alg_enc); 169 if (!algo) { 170 ipseclog((LOG_DEBUG, "IPv4 ESP input: " 171 "unsupported encryption algorithm for spi %u\n", 172 (u_int32_t)ntohl(spi))); 173 ipsecstat.in_badspi++; 174 goto bad; 175 } 176 177 /* check if we have proper ivlen information */ 178 ivlen = sav->ivlen; 179 if (ivlen < 0) { 180 ipseclog((LOG_ERR, "improper ivlen in IPv4 ESP input: %s %s\n", 181 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 182 ipsecstat.in_inval++; 183 goto bad; 184 } 185 186 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay 187 && (sav->alg_auth && sav->key_auth))) 188 goto noreplaycheck; 189 190 if (sav->alg_auth == SADB_X_AALG_NULL || 191 sav->alg_auth == SADB_AALG_NONE) 192 goto noreplaycheck; 193 194 /* 195 * check for sequence number. 196 */ 197 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) 198 ; /* okey */ 199 else { 200 ipsecstat.in_espreplay++; 201 ipseclog((LOG_WARNING, 202 "replay packet in IPv4 ESP input: %s %s\n", 203 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 204 goto bad; 205 } 206 207 /* check ICV */ 208 { 209 u_char sum0[AH_MAXSUMSIZE]; 210 u_char sum[AH_MAXSUMSIZE]; 211 const struct ah_algorithm *sumalgo; 212 size_t siz; 213 214 sumalgo = ah_algorithm_lookup(sav->alg_auth); 215 if (!sumalgo) 216 goto noreplaycheck; 217 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); 218 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) { 219 ipsecstat.in_inval++; 220 goto bad; 221 } 222 if (AH_MAXSUMSIZE < siz) { 223 ipseclog((LOG_DEBUG, 224 "internal error: AH_MAXSUMSIZE must be larger than %lu\n", 225 (u_long)siz)); 226 ipsecstat.in_inval++; 227 goto bad; 228 } 229 230 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); 231 232 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { 233 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", 234 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 235 ipsecstat.in_espauthfail++; 236 goto bad; 237 } 238 239 if (bcmp(sum0, sum, siz) != 0) { 240 ipseclog((LOG_WARNING, "auth fail in IPv4 ESP input: %s %s\n", 241 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 242 ipsecstat.in_espauthfail++; 243 goto bad; 244 } 245 246 /* strip off the authentication data */ 247 m_adj(m, -siz); 248 ip = mtod(m, struct ip *); 249 #ifdef IPLEN_FLIPPED 250 ip->ip_len = ip->ip_len - siz; 251 #else 252 ip->ip_len = htons(ntohs(ip->ip_len) - siz); 253 #endif 254 m->m_flags |= M_AUTHIPDGM; 255 ipsecstat.in_espauthsucc++; 256 } 257 258 /* 259 * update sequence number. 260 */ 261 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { 262 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { 263 ipsecstat.in_espreplay++; 264 goto bad; 265 } 266 } 267 268 noreplaycheck: 269 270 /* process main esp header. */ 271 if (sav->flags & SADB_X_EXT_OLD) { 272 /* RFC 1827 */ 273 esplen = sizeof(struct esp); 274 } else { 275 /* RFC 2406 */ 276 if (sav->flags & SADB_X_EXT_DERIV) 277 esplen = sizeof(struct esp); 278 else 279 esplen = sizeof(struct newesp); 280 } 281 282 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { 283 ipseclog((LOG_WARNING, 284 "IPv4 ESP input: packet too short\n")); 285 ipsecstat.in_inval++; 286 goto bad; 287 } 288 289 if (m->m_len < off + esplen + ivlen) { 290 m = m_pullup(m, off + esplen + ivlen); 291 if (!m) { 292 ipseclog((LOG_DEBUG, 293 "IPv4 ESP input: can't pullup in esp4_input\n")); 294 ipsecstat.in_inval++; 295 goto bad; 296 } 297 } 298 299 /* 300 * pre-compute and cache intermediate key 301 */ 302 if (esp_schedule(algo, sav) != 0) { 303 ipsecstat.in_inval++; 304 goto bad; 305 } 306 307 /* 308 * decrypt the packet. 309 */ 310 if (!algo->decrypt) 311 panic("internal error: no decrypt function"); 312 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { 313 /* m is already freed */ 314 m = NULL; 315 ipseclog((LOG_ERR, "decrypt fail in IPv4 ESP input: %s\n", 316 ipsec_logsastr(sav))); 317 ipsecstat.in_inval++; 318 goto bad; 319 } 320 ipsecstat.in_esphist[sav->alg_enc]++; 321 322 m->m_flags |= M_DECRYPTED; 323 324 /* 325 * find the trailer of the ESP. 326 */ 327 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), 328 (caddr_t)&esptail); 329 nxt = esptail.esp_nxt; 330 taillen = esptail.esp_padlen + sizeof(esptail); 331 332 if (m->m_pkthdr.len < taillen || 333 m->m_pkthdr.len - taillen < off + esplen + ivlen + sizeof(esptail)) { 334 ipseclog((LOG_WARNING, 335 "bad pad length in IPv4 ESP input: %s %s\n", 336 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 337 ipsecstat.in_inval++; 338 goto bad; 339 } 340 341 /* strip off the trailing pad area. */ 342 m_adj(m, -taillen); 343 344 #ifdef IPLEN_FLIPPED 345 ip->ip_len = ip->ip_len - taillen; 346 #else 347 ip->ip_len = htons(ntohs(ip->ip_len) - taillen); 348 #endif 349 350 /* was it transmitted over the IPsec tunnel SA? */ 351 if (ipsec4_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { 352 /* 353 * strip off all the headers that precedes ESP header. 354 * IP4 xx ESP IP4' payload -> IP4' payload 355 * 356 * XXX more sanity checks 357 * XXX relationship with gif? 358 */ 359 u_int8_t tos; 360 361 tos = ip->ip_tos; 362 m_adj(m, off + esplen + ivlen); 363 if (m->m_len < sizeof(*ip)) { 364 m = m_pullup(m, sizeof(*ip)); 365 if (!m) { 366 ipsecstat.in_inval++; 367 goto bad; 368 } 369 } 370 ip = mtod(m, struct ip *); 371 /* ECN consideration. */ 372 ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos); 373 if (!key_checktunnelsanity(sav, AF_INET, 374 (caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) { 375 ipseclog((LOG_ERR, "ipsec tunnel address mismatch " 376 "in IPv4 ESP input: %s %s\n", 377 ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav))); 378 ipsecstat.in_inval++; 379 goto bad; 380 } 381 382 key_sa_recordxfer(sav, m); 383 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || 384 ipsec_addhist(m, IPPROTO_IPV4, 0) != 0) { 385 ipsecstat.in_nomem++; 386 goto bad; 387 } 388 389 if (netisr_queue(NETISR_IP, m)) { 390 ipsecstat.in_inval++; 391 m = NULL; 392 goto bad; 393 } 394 395 nxt = IPPROTO_DONE; 396 } else { 397 /* 398 * strip off ESP header and IV. 399 * even in m_pulldown case, we need to strip off ESP so that 400 * we can always compute checksum for AH correctly. 401 */ 402 size_t stripsiz; 403 404 stripsiz = esplen + ivlen; 405 406 ip = mtod(m, struct ip *); 407 ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off); 408 m->m_data += stripsiz; 409 m->m_len -= stripsiz; 410 m->m_pkthdr.len -= stripsiz; 411 412 ip = mtod(m, struct ip *); 413 #ifdef IPLEN_FLIPPED 414 ip->ip_len = ip->ip_len - stripsiz; 415 #else 416 ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz); 417 #endif 418 ip->ip_p = nxt; 419 420 key_sa_recordxfer(sav, m); 421 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { 422 ipsecstat.in_nomem++; 423 goto bad; 424 } 425 426 if (nxt != IPPROTO_DONE) { 427 if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) && 428 ipsec4_in_reject(m, NULL)) { 429 ipsecstat.in_polvio++; 430 goto bad; 431 } 432 if (!ip_lengthcheck(&m, 0)) { 433 /* freed in ip_lengthcheck() */ 434 goto bad; 435 } 436 *mp = m; 437 *offp = off; 438 (*inetsw[ip_protox[nxt]].pr_input)(mp, offp, nxt); 439 } else { 440 m_freem(m); 441 } 442 m = NULL; 443 } 444 445 if (sav) { 446 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 447 kprintf("DP esp4_input call free SA:%p\n", sav)); 448 key_freesav(sav); 449 } 450 ipsecstat.in_success++; 451 return(IPPROTO_DONE); 452 453 bad: 454 if (sav) { 455 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 456 kprintf("DP esp4_input call free SA:%p\n", sav)); 457 key_freesav(sav); 458 } 459 if (m) 460 m_freem(m); 461 return(IPPROTO_DONE); 462 } 463 #endif /* INET */ 464 465 #ifdef INET6 466 int 467 esp6_input(struct mbuf **mp, int *offp, int proto) 468 { 469 struct mbuf *m = *mp; 470 int off = *offp; 471 struct ip6_hdr *ip6; 472 struct esp *esp; 473 struct esptail esptail; 474 u_int32_t spi; 475 struct secasvar *sav = NULL; 476 size_t taillen; 477 u_int16_t nxt; 478 const struct esp_algorithm *algo; 479 int ivlen; 480 size_t esplen; 481 482 /* sanity check for alignment. */ 483 if (off % 4 != 0 || m->m_pkthdr.len % 4 != 0) { 484 ipseclog((LOG_ERR, "IPv6 ESP input: packet alignment problem " 485 "(off=%d, pktlen=%d)\n", off, m->m_pkthdr.len)); 486 ipsec6stat.in_inval++; 487 goto bad; 488 } 489 490 #ifndef PULLDOWN_TEST 491 IP6_EXTHDR_CHECK(m, off, ESPMAXLEN, IPPROTO_DONE); 492 esp = (struct esp *)(mtod(m, caddr_t) + off); 493 #else 494 IP6_EXTHDR_GET(esp, struct esp *, m, off, ESPMAXLEN); 495 if (esp == NULL) { 496 ipsec6stat.in_inval++; 497 return IPPROTO_DONE; 498 } 499 #endif 500 ip6 = mtod(m, struct ip6_hdr *); 501 502 if (ntohs(ip6->ip6_plen) == 0) { 503 ipseclog((LOG_ERR, "IPv6 ESP input: " 504 "ESP with IPv6 jumbogram is not supported.\n")); 505 ipsec6stat.in_inval++; 506 goto bad; 507 } 508 509 /* find the sassoc. */ 510 spi = esp->esp_spi; 511 512 if ((sav = key_allocsa(AF_INET6, 513 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst, 514 IPPROTO_ESP, spi)) == NULL) { 515 ipseclog((LOG_WARNING, 516 "IPv6 ESP input: no key association found for spi %u\n", 517 (u_int32_t)ntohl(spi))); 518 ipsec6stat.in_nosa++; 519 goto bad; 520 } 521 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 522 kprintf("DP esp6_input called to allocate SA:%p\n", sav)); 523 if (sav->state != SADB_SASTATE_MATURE 524 && sav->state != SADB_SASTATE_DYING) { 525 ipseclog((LOG_DEBUG, 526 "IPv6 ESP input: non-mature/dying SA found for spi %u\n", 527 (u_int32_t)ntohl(spi))); 528 ipsec6stat.in_badspi++; 529 goto bad; 530 } 531 algo = esp_algorithm_lookup(sav->alg_enc); 532 if (!algo) { 533 ipseclog((LOG_DEBUG, "IPv6 ESP input: " 534 "unsupported encryption algorithm for spi %u\n", 535 (u_int32_t)ntohl(spi))); 536 ipsec6stat.in_badspi++; 537 goto bad; 538 } 539 540 /* check if we have proper ivlen information */ 541 ivlen = sav->ivlen; 542 if (ivlen < 0) { 543 ipseclog((LOG_ERR, "improper ivlen in IPv6 ESP input: %s %s\n", 544 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 545 ipsec6stat.in_badspi++; 546 goto bad; 547 } 548 549 if (!((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay 550 && (sav->alg_auth && sav->key_auth))) 551 goto noreplaycheck; 552 553 if (sav->alg_auth == SADB_X_AALG_NULL || 554 sav->alg_auth == SADB_AALG_NONE) 555 goto noreplaycheck; 556 557 /* 558 * check for sequence number. 559 */ 560 if (ipsec_chkreplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) 561 ; /* okey */ 562 else { 563 ipsec6stat.in_espreplay++; 564 ipseclog((LOG_WARNING, 565 "replay packet in IPv6 ESP input: %s %s\n", 566 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 567 goto bad; 568 } 569 570 /* check ICV */ 571 { 572 u_char sum0[AH_MAXSUMSIZE]; 573 u_char sum[AH_MAXSUMSIZE]; 574 const struct ah_algorithm *sumalgo; 575 size_t siz; 576 577 sumalgo = ah_algorithm_lookup(sav->alg_auth); 578 if (!sumalgo) 579 goto noreplaycheck; 580 siz = (((*sumalgo->sumsiz)(sav) + 3) & ~(4 - 1)); 581 if (m->m_pkthdr.len < off + ESPMAXLEN + siz) { 582 ipsec6stat.in_inval++; 583 goto bad; 584 } 585 if (AH_MAXSUMSIZE < siz) { 586 ipseclog((LOG_DEBUG, 587 "internal error: AH_MAXSUMSIZE must be larger than %lu\n", 588 (u_long)siz)); 589 ipsec6stat.in_inval++; 590 goto bad; 591 } 592 593 m_copydata(m, m->m_pkthdr.len - siz, siz, &sum0[0]); 594 595 if (esp_auth(m, off, m->m_pkthdr.len - off - siz, sav, sum)) { 596 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", 597 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 598 ipsec6stat.in_espauthfail++; 599 goto bad; 600 } 601 602 if (bcmp(sum0, sum, siz) != 0) { 603 ipseclog((LOG_WARNING, "auth fail in IPv6 ESP input: %s %s\n", 604 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 605 ipsec6stat.in_espauthfail++; 606 goto bad; 607 } 608 609 /* strip off the authentication data */ 610 m_adj(m, -siz); 611 ip6 = mtod(m, struct ip6_hdr *); 612 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - siz); 613 614 m->m_flags |= M_AUTHIPDGM; 615 ipsec6stat.in_espauthsucc++; 616 } 617 618 /* 619 * update sequence number. 620 */ 621 if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) { 622 if (ipsec_updatereplay(ntohl(((struct newesp *)esp)->esp_seq), sav)) { 623 ipsec6stat.in_espreplay++; 624 goto bad; 625 } 626 } 627 628 noreplaycheck: 629 630 /* process main esp header. */ 631 if (sav->flags & SADB_X_EXT_OLD) { 632 /* RFC 1827 */ 633 esplen = sizeof(struct esp); 634 } else { 635 /* RFC 2406 */ 636 if (sav->flags & SADB_X_EXT_DERIV) 637 esplen = sizeof(struct esp); 638 else 639 esplen = sizeof(struct newesp); 640 } 641 642 if (m->m_pkthdr.len < off + esplen + ivlen + sizeof(esptail)) { 643 ipseclog((LOG_WARNING, 644 "IPv6 ESP input: packet too short\n")); 645 ipsec6stat.in_inval++; 646 goto bad; 647 } 648 649 #ifndef PULLDOWN_TEST 650 IP6_EXTHDR_CHECK(m, off, esplen + ivlen, IPPROTO_DONE); /* XXX */ 651 #else 652 IP6_EXTHDR_GET(esp, struct esp *, m, off, esplen + ivlen); 653 if (esp == NULL) { 654 ipsec6stat.in_inval++; 655 m = NULL; 656 goto bad; 657 } 658 #endif 659 ip6 = mtod(m, struct ip6_hdr *); /* set it again just in case */ 660 661 /* 662 * pre-compute and cache intermediate key 663 */ 664 if (esp_schedule(algo, sav) != 0) { 665 ipsec6stat.in_inval++; 666 goto bad; 667 } 668 669 /* 670 * decrypt the packet. 671 */ 672 if (!algo->decrypt) 673 panic("internal error: no decrypt function"); 674 if ((*algo->decrypt)(m, off, sav, algo, ivlen)) { 675 /* m is already freed */ 676 m = NULL; 677 ipseclog((LOG_ERR, "decrypt fail in IPv6 ESP input: %s\n", 678 ipsec_logsastr(sav))); 679 ipsec6stat.in_inval++; 680 goto bad; 681 } 682 ipsec6stat.in_esphist[sav->alg_enc]++; 683 684 m->m_flags |= M_DECRYPTED; 685 686 /* 687 * find the trailer of the ESP. 688 */ 689 m_copydata(m, m->m_pkthdr.len - sizeof(esptail), sizeof(esptail), 690 (caddr_t)&esptail); 691 nxt = esptail.esp_nxt; 692 taillen = esptail.esp_padlen + sizeof(esptail); 693 694 if (m->m_pkthdr.len < taillen 695 || m->m_pkthdr.len - taillen < sizeof(struct ip6_hdr)) { /* ? */ 696 ipseclog((LOG_WARNING, 697 "bad pad length in IPv6 ESP input: %s %s\n", 698 ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav))); 699 ipsec6stat.in_inval++; 700 goto bad; 701 } 702 703 /* strip off the trailing pad area. */ 704 m_adj(m, -taillen); 705 706 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - taillen); 707 708 /* was it transmitted over the IPsec tunnel SA? */ 709 if (ipsec6_tunnel_validate(m, off + esplen + ivlen, nxt, sav)) { 710 /* 711 * strip off all the headers that precedes ESP header. 712 * IP6 xx ESP IP6' payload -> IP6' payload 713 * 714 * XXX more sanity checks 715 * XXX relationship with gif? 716 */ 717 u_int32_t flowinfo; /* net endian */ 718 flowinfo = ip6->ip6_flow; 719 m_adj(m, off + esplen + ivlen); 720 if (m->m_len < sizeof(*ip6)) { 721 #ifndef PULLDOWN_TEST 722 /* 723 * m_pullup is prohibited in KAME IPv6 input processing 724 * but there's no other way! 725 */ 726 #else 727 /* okay to pullup in m_pulldown style */ 728 #endif 729 m = m_pullup(m, sizeof(*ip6)); 730 if (!m) { 731 ipsec6stat.in_inval++; 732 goto bad; 733 } 734 } 735 ip6 = mtod(m, struct ip6_hdr *); 736 /* ECN consideration. */ 737 ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow); 738 if (!key_checktunnelsanity(sav, AF_INET6, 739 (caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) { 740 ipseclog((LOG_ERR, "ipsec tunnel address mismatch " 741 "in IPv6 ESP input: %s %s\n", 742 ipsec6_logpacketstr(ip6, spi), 743 ipsec_logsastr(sav))); 744 ipsec6stat.in_inval++; 745 goto bad; 746 } 747 748 key_sa_recordxfer(sav, m); 749 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0 || 750 ipsec_addhist(m, IPPROTO_IPV6, 0) != 0) { 751 ipsec6stat.in_nomem++; 752 goto bad; 753 } 754 755 if (netisr_queue(NETISR_IPV6, m)) { 756 ipsec6stat.in_inval++; 757 m = NULL; 758 goto bad; 759 } 760 761 nxt = IPPROTO_DONE; 762 } else { 763 /* 764 * strip off ESP header and IV. 765 * even in m_pulldown case, we need to strip off ESP so that 766 * we can always compute checksum for AH correctly. 767 */ 768 size_t stripsiz; 769 char *prvnxtp; 770 771 /* 772 * Set the next header field of the previous header correctly. 773 */ 774 prvnxtp = ip6_get_prevhdr(m, off); /* XXX */ 775 *prvnxtp = nxt; 776 777 stripsiz = esplen + ivlen; 778 779 ip6 = mtod(m, struct ip6_hdr *); 780 if (m->m_len >= stripsiz + off) { 781 ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off); 782 m->m_data += stripsiz; 783 m->m_len -= stripsiz; 784 m->m_pkthdr.len -= stripsiz; 785 } else { 786 /* 787 * this comes with no copy if the boundary is on 788 * cluster 789 */ 790 struct mbuf *n; 791 792 n = m_split(m, off, MB_DONTWAIT); 793 if (n == NULL) { 794 /* m is retained by m_split */ 795 goto bad; 796 } 797 m_adj(n, stripsiz); 798 /* m_cat does not update m_pkthdr.len */ 799 m->m_pkthdr.len += n->m_pkthdr.len; 800 m_cat(m, n); 801 } 802 803 #ifndef PULLDOWN_TEST 804 /* 805 * KAME requires that the packet to be contiguous on the 806 * mbuf. We need to make that sure. 807 * this kind of code should be avoided. 808 * XXX other conditions to avoid running this part? 809 */ 810 if (m->m_len != m->m_pkthdr.len) { 811 struct mbuf *n = NULL; 812 int maxlen; 813 814 n = m_getb(m->m_pkthdr.len, MB_DONTWAIT, MT_HEADER, 815 M_PKTHDR); 816 if (!n) { 817 kprintf("esp6_input: mbuf allocation failed\n"); 818 goto bad; 819 } 820 M_MOVE_PKTHDR(n, m); 821 822 maxlen = (n->m_flags & M_EXT) ? MCLBYTES : MHLEN; 823 if (n->m_pkthdr.len <= maxlen) { 824 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 825 n->m_len = n->m_pkthdr.len; 826 n->m_next = NULL; 827 m_freem(m); 828 } else { 829 m_copydata(m, 0, maxlen, mtod(n, caddr_t)); 830 n->m_len = maxlen; 831 n->m_next = m; 832 m_adj(m, maxlen); 833 } 834 m = n; 835 } 836 #endif 837 838 ip6 = mtod(m, struct ip6_hdr *); 839 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz); 840 841 key_sa_recordxfer(sav, m); 842 if (ipsec_addhist(m, IPPROTO_ESP, spi) != 0) { 843 ipsec6stat.in_nomem++; 844 goto bad; 845 } 846 } 847 848 *offp = off; 849 *mp = m; 850 851 if (sav) { 852 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 853 kprintf("DP esp6_input call free SA:%p\n", sav)); 854 key_freesav(sav); 855 } 856 ipsec6stat.in_success++; 857 return nxt; 858 859 bad: 860 if (sav) { 861 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 862 kprintf("DP esp6_input call free SA:%p\n", sav)); 863 key_freesav(sav); 864 } 865 if (m) 866 m_freem(m); 867 return IPPROTO_DONE; 868 } 869 870 void 871 esp6_ctlinput(netmsg_t msg) 872 { 873 int cmd = msg->ctlinput.nm_cmd; 874 struct sockaddr *sa = msg->ctlinput.nm_arg; 875 void *d = msg->ctlinput.nm_extra; 876 const struct newesp *espp; 877 struct newesp esp; 878 struct ip6ctlparam *ip6cp = NULL, ip6cp1; 879 struct secasvar *sav; 880 struct ip6_hdr *ip6; 881 struct mbuf *m; 882 int off; 883 struct sockaddr_in6 *sa6_src, *sa6_dst; 884 885 if (sa->sa_family != AF_INET6 || 886 sa->sa_len != sizeof(struct sockaddr_in6)) 887 goto out; 888 if ((unsigned)cmd >= PRC_NCMDS) 889 goto out; 890 891 /* if the parameter is from icmp6, decode it. */ 892 if (d != NULL) { 893 ip6cp = (struct ip6ctlparam *)d; 894 m = ip6cp->ip6c_m; 895 ip6 = ip6cp->ip6c_ip6; 896 off = ip6cp->ip6c_off; 897 } else { 898 m = NULL; 899 ip6 = NULL; 900 off = 0; /* fix warning */ 901 } 902 903 if (ip6) { 904 /* 905 * Notify the error to all possible sockets via pfctlinput2. 906 * Since the upper layer information (such as protocol type, 907 * source and destination ports) is embedded in the encrypted 908 * data and might have been cut, we can't directly call 909 * an upper layer ctlinput function. However, the pcbnotify 910 * function will consider source and destination addresses 911 * as well as the flow info value, and may be able to find 912 * some PCB that should be notified. 913 * Although kpfctlinput2 will call esp6_ctlinput(), there is 914 * no possibility of an infinite loop of function calls, 915 * because we don't pass the inner IPv6 header. 916 */ 917 bzero(&ip6cp1, sizeof(ip6cp1)); 918 ip6cp1.ip6c_src = ip6cp->ip6c_src; 919 kpfctlinput2(cmd, sa, (void *)&ip6cp1); 920 921 /* 922 * Then go to special cases that need ESP header information. 923 * XXX: We assume that when ip6 is non NULL, 924 * M and OFF are valid. 925 */ 926 927 /* check if we can safely examine src and dst ports */ 928 if (m->m_pkthdr.len < off + sizeof(esp)) 929 goto out; 930 931 if (m->m_len < off + sizeof(esp)) { 932 /* 933 * this should be rare case, 934 * so we compromise on this copy... 935 */ 936 m_copydata(m, off, sizeof(esp), (caddr_t)&esp); 937 espp = &esp; 938 } else 939 espp = (struct newesp*)(mtod(m, caddr_t) + off); 940 941 if (cmd == PRC_MSGSIZE) { 942 int valid = 0; 943 944 /* 945 * Check to see if we have a valid SA corresponding to 946 * the address in the ICMP message payload. 947 */ 948 sa6_src = ip6cp->ip6c_src; 949 sa6_dst = (struct sockaddr_in6 *)sa; 950 sav = key_allocsa(AF_INET6, 951 (caddr_t)&sa6_src->sin6_addr, 952 (caddr_t)&sa6_dst->sin6_addr, 953 IPPROTO_ESP, espp->esp_spi); 954 if (sav) { 955 if (sav->state == SADB_SASTATE_MATURE || 956 sav->state == SADB_SASTATE_DYING) 957 valid++; 958 key_freesav(sav); 959 } 960 961 /* XXX Further validation? */ 962 963 /* 964 * Depending on the value of "valid" and routing table 965 * size (mtudisc_{hi,lo}wat), we will: 966 * - recalcurate the new MTU and create the 967 * corresponding routing entry, or 968 * - ignore the MTU change notification. 969 */ 970 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 971 } 972 } else { 973 /* we normally notify any pcb here */ 974 } 975 out: 976 lwkt_replymsg(&msg->ctlinput.base.lmsg, 0); 977 } 978 #endif /* INET6 */
Cache object: 766c568b802751858828aaccc22901ed
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