ipsec.c revision 1.147
1 /* $NetBSD: ipsec.c,v 1.147 2018/02/28 10:09:17 maxv Exp $ */ 2 /* $FreeBSD: src/sys/netipsec/ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */ 3 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.147 2018/02/28 10:09:17 maxv Exp $"); 36 37 /* 38 * IPsec controller part. 39 */ 40 41 #if defined(_KERNEL_OPT) 42 #include "opt_inet.h" 43 #include "opt_ipsec.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/mbuf.h> 49 #include <sys/domain.h> 50 #include <sys/protosw.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/errno.h> 54 #include <sys/time.h> 55 #include <sys/kernel.h> 56 #include <sys/syslog.h> 57 #include <sys/sysctl.h> 58 #include <sys/proc.h> 59 #include <sys/kauth.h> 60 #include <sys/cpu.h> 61 #include <sys/kmem.h> 62 #include <sys/pserialize.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/in_var.h> 72 #include <netinet/udp.h> 73 #include <netinet/udp_var.h> 74 #include <netinet/tcp.h> 75 #include <netinet/udp.h> 76 #include <netinet/ip_icmp.h> 77 #include <netinet/ip_private.h> 78 79 #include <netinet/ip6.h> 80 #ifdef INET6 81 #include <netinet6/ip6_var.h> 82 #endif 83 #include <netinet/in_pcb.h> 84 #ifdef INET6 85 #include <netinet6/in6_pcb.h> 86 #include <netinet/icmp6.h> 87 #endif 88 89 #include <netipsec/ipsec.h> 90 #include <netipsec/ipsec_var.h> 91 #include <netipsec/ipsec_private.h> 92 #ifdef INET6 93 #include <netipsec/ipsec6.h> 94 #endif 95 #include <netipsec/ah_var.h> 96 #include <netipsec/esp_var.h> 97 #include <netipsec/ipcomp.h> /*XXX*/ 98 #include <netipsec/ipcomp_var.h> 99 100 #include <netipsec/key.h> 101 #include <netipsec/keydb.h> 102 #include <netipsec/key_debug.h> 103 104 #include <netipsec/xform.h> 105 106 int ipsec_used = 0; 107 int ipsec_enabled = 1; 108 109 #ifdef IPSEC_DEBUG 110 int ipsec_debug = 1; 111 112 /* 113 * When set to 1, IPsec will send packets with the same sequence number. 114 * This allows to verify if the other side has proper replay attacks detection. 115 */ 116 int ipsec_replay = 0; 117 118 /* 119 * When set 1, IPsec will send packets with corrupted HMAC. 120 * This allows to verify if the other side properly detects modified packets. 121 */ 122 int ipsec_integrity = 0; 123 #else 124 int ipsec_debug = 0; 125 #endif 126 127 percpu_t *ipsecstat_percpu; 128 129 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 130 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ 131 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 132 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 133 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 134 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 135 struct secpolicy ip4_def_policy; 136 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 137 138 u_int ipsec_spdgen = 1; /* SPD generation # */ 139 140 static struct secpolicy ipsec_dummy_sp __read_mostly = { 141 .state = IPSEC_SPSTATE_ALIVE, 142 /* If ENTRUST, the dummy SP never be used. See ipsec_getpolicybysock. */ 143 .policy = IPSEC_POLICY_ENTRUST, 144 }; 145 146 static struct secpolicy *ipsec_checkpcbcache(struct mbuf *, 147 struct inpcbpolicy *, int); 148 static int ipsec_fillpcbcache(struct inpcbpolicy *, struct mbuf *, 149 struct secpolicy *, int); 150 static int ipsec_invalpcbcache(struct inpcbpolicy *, int); 151 152 /* 153 * Crypto support requirements: 154 * 155 * 1 require hardware support 156 * -1 require software support 157 * 0 take anything 158 */ 159 int crypto_support = 0; 160 161 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 162 struct inpcb_hdr *, int *); 163 164 #ifdef INET6 165 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 166 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 167 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 168 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 169 struct secpolicy ip6_def_policy; 170 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 171 #endif 172 173 static int ipsec4_setspidx_inpcb(struct mbuf *, struct inpcb *); 174 #ifdef INET6 175 static int ipsec6_setspidx_in6pcb(struct mbuf *, struct in6pcb *); 176 #endif 177 static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int); 178 static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 179 static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 180 #ifdef INET6 181 static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 182 static int ipsec6_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 183 #endif 184 static void ipsec_delpcbpolicy(struct inpcbpolicy *); 185 #if 0 /* unused */ 186 static struct secpolicy *ipsec_deepcopy_policy(const struct secpolicy *); 187 #endif 188 static void ipsec_destroy_policy(struct secpolicy *); 189 static int ipsec_sp_reject(const struct secpolicy *, const struct mbuf *); 190 static void vshiftl(unsigned char *, int, int); 191 static size_t ipsec_sp_hdrsiz(const struct secpolicy *, const struct mbuf *); 192 193 /* 194 * Try to validate and use cached policy on a PCB. 195 */ 196 static struct secpolicy * 197 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 198 { 199 struct secpolicyindex spidx; 200 struct secpolicy *sp = NULL; 201 int s; 202 203 KASSERT(IPSEC_DIR_IS_VALID(dir)); 204 KASSERT(pcbsp != NULL); 205 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 206 KASSERT(inph_locked(pcbsp->sp_inph)); 207 208 /* 209 * Checking the generation and sp->state and taking a reference to an SP 210 * must be in a critical section of pserialize. See key_unlink_sp. 211 */ 212 s = pserialize_read_enter(); 213 /* SPD table change invalidate all the caches. */ 214 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 215 ipsec_invalpcbcache(pcbsp, dir); 216 goto out; 217 } 218 sp = pcbsp->sp_cache[dir].cachesp; 219 if (sp == NULL) 220 goto out; 221 if (sp->state != IPSEC_SPSTATE_ALIVE) { 222 sp = NULL; 223 ipsec_invalpcbcache(pcbsp, dir); 224 goto out; 225 } 226 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 227 /* NB: assume ipsec_setspidx never sleep */ 228 if (ipsec_setspidx(m, &spidx, 1) != 0) { 229 sp = NULL; 230 goto out; 231 } 232 233 /* 234 * We have to make an exact match here since the cached rule 235 * might have lower priority than a rule that would otherwise 236 * have matched the packet. 237 */ 238 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 239 sizeof(spidx))) { 240 sp = NULL; 241 goto out; 242 } 243 } else { 244 /* 245 * The pcb is connected, and the L4 code is sure that: 246 * - outgoing side uses inp_[lf]addr 247 * - incoming side looks up policy after inpcb lookup 248 * and address pair is know to be stable. We do not need 249 * to generate spidx again, nor check the address match again. 250 * 251 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 252 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 253 */ 254 } 255 256 sp->lastused = time_second; 257 KEY_SP_REF(sp); 258 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 259 "DP cause refcnt++:%d SP:%p\n", 260 key_sp_refcnt(sp), pcbsp->sp_cache[dir].cachesp); 261 out: 262 pserialize_read_exit(s); 263 return sp; 264 } 265 266 static int 267 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 268 struct secpolicy *sp, int dir) 269 { 270 271 KASSERT(IPSEC_DIR_IS_INOROUT(dir)); 272 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 273 KASSERT(inph_locked(pcbsp->sp_inph)); 274 275 pcbsp->sp_cache[dir].cachesp = NULL; 276 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_UNKNOWN; 277 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 278 return EINVAL; 279 } 280 pcbsp->sp_cache[dir].cachesp = sp; 281 if (pcbsp->sp_cache[dir].cachesp) { 282 /* 283 * If the PCB is connected, we can remember a hint to 284 * possibly short-circuit IPsec processing in other places. 285 */ 286 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 287 switch (pcbsp->sp_cache[dir].cachesp->policy) { 288 case IPSEC_POLICY_NONE: 289 case IPSEC_POLICY_BYPASS: 290 pcbsp->sp_cache[dir].cachehint = 291 IPSEC_PCBHINT_NO; 292 break; 293 default: 294 pcbsp->sp_cache[dir].cachehint = 295 IPSEC_PCBHINT_YES; 296 } 297 } 298 } 299 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 300 301 return 0; 302 } 303 304 static int 305 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 306 { 307 int i; 308 309 KASSERT(inph_locked(pcbsp->sp_inph)); 310 311 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 312 if (dir != IPSEC_DIR_ANY && i != dir) 313 continue; 314 pcbsp->sp_cache[i].cachesp = NULL; 315 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_UNKNOWN; 316 pcbsp->sp_cache[i].cachegen = 0; 317 memset(&pcbsp->sp_cache[i].cacheidx, 0, 318 sizeof(pcbsp->sp_cache[i].cacheidx)); 319 } 320 return 0; 321 } 322 323 void 324 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 325 { 326 327 KASSERT(inph_locked(pcbsp->sp_inph)); 328 329 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 330 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 331 } 332 333 void 334 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 335 { 336 337 KASSERT(inph_locked(pcbsp->sp_inph)); 338 339 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 340 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 341 } 342 343 void 344 ipsec_invalpcbcacheall(void) 345 { 346 347 if (ipsec_spdgen == UINT_MAX) 348 ipsec_spdgen = 1; 349 else 350 ipsec_spdgen++; 351 } 352 353 /* 354 * Return a held reference to the default SP. 355 */ 356 static struct secpolicy * 357 key_get_default_sp(int af, const char *where, int tag) 358 { 359 struct secpolicy *sp; 360 361 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP from %s:%u\n", where, tag); 362 363 switch(af) { 364 case AF_INET: 365 sp = &ip4_def_policy; 366 break; 367 #ifdef INET6 368 case AF_INET6: 369 sp = &ip6_def_policy; 370 break; 371 #endif 372 default: 373 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 374 "unexpected protocol family %u\n", af); 375 return NULL; 376 } 377 378 if (sp->policy != IPSEC_POLICY_DISCARD && 379 sp->policy != IPSEC_POLICY_NONE) { 380 IPSECLOG(LOG_INFO, "fixed system default policy: %d->%d\n", 381 sp->policy, IPSEC_POLICY_NONE); 382 sp->policy = IPSEC_POLICY_NONE; 383 } 384 KEY_SP_REF(sp); 385 386 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP returns SP:%p (%u)\n", 387 sp, key_sp_refcnt(sp)); 388 return sp; 389 } 390 391 #define KEY_GET_DEFAULT_SP(af) \ 392 key_get_default_sp((af), __func__, __LINE__) 393 394 /* 395 * For OUTBOUND packet having a socket. Searching SPD for packet, 396 * and return a pointer to SP. 397 * OUT: NULL: no apropreate SP found, the following value is set to error. 398 * 0 : bypass 399 * EACCES : discard packet. 400 * ENOENT : ipsec_acquire() in progress, maybe. 401 * others : error occurred. 402 * others: a pointer to SP 403 * 404 * NOTE: IPv6 mapped address concern is implemented here. 405 */ 406 static struct secpolicy * 407 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb_hdr *inph, 408 int *error) 409 { 410 struct inpcbpolicy *pcbsp = NULL; 411 struct secpolicy *currsp = NULL; /* policy on socket */ 412 struct secpolicy *sp; 413 int af; 414 415 KASSERT(m != NULL); 416 KASSERT(inph != NULL); 417 KASSERT(error != NULL); 418 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 419 420 KASSERT(inph->inph_socket != NULL); 421 KASSERT(inph_locked(inph)); 422 423 /* XXX FIXME inpcb/in6pcb vs socket*/ 424 af = inph->inph_af; 425 KASSERTMSG(af == AF_INET || af == AF_INET6, 426 "unexpected protocol family %u", af); 427 428 KASSERT(inph->inph_sp != NULL); 429 /* If we have a cached entry, and if it is still valid, use it. */ 430 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); 431 currsp = ipsec_checkpcbcache(m, inph->inph_sp, dir); 432 if (currsp) { 433 *error = 0; 434 return currsp; 435 } 436 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); 437 438 switch (af) { 439 case AF_INET: { 440 struct inpcb *in4p = (struct inpcb *)inph; 441 /* set spidx in pcb */ 442 *error = ipsec4_setspidx_inpcb(m, in4p); 443 pcbsp = in4p->inp_sp; 444 break; 445 } 446 #if defined(INET6) 447 case AF_INET6: { 448 struct in6pcb *in6p = (struct in6pcb *)inph; 449 /* set spidx in pcb */ 450 *error = ipsec6_setspidx_in6pcb(m, in6p); 451 pcbsp = in6p->in6p_sp; 452 break; 453 } 454 #endif 455 default: 456 *error = EPFNOSUPPORT; 457 break; 458 } 459 if (*error) 460 return NULL; 461 462 KASSERT(pcbsp != NULL); 463 switch (dir) { 464 case IPSEC_DIR_INBOUND: 465 currsp = pcbsp->sp_in; 466 break; 467 case IPSEC_DIR_OUTBOUND: 468 currsp = pcbsp->sp_out; 469 break; 470 } 471 KASSERT(currsp != NULL); 472 473 if (pcbsp->priv) { /* when privilieged socket */ 474 switch (currsp->policy) { 475 case IPSEC_POLICY_BYPASS: 476 case IPSEC_POLICY_IPSEC: 477 KEY_SP_REF(currsp); 478 sp = currsp; 479 break; 480 481 case IPSEC_POLICY_ENTRUST: 482 /* look for a policy in SPD */ 483 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 484 if (sp == NULL) /* no SP found */ 485 sp = KEY_GET_DEFAULT_SP(af); 486 break; 487 488 default: 489 IPSECLOG(LOG_ERR, "Invalid policy for PCB %d\n", 490 currsp->policy); 491 *error = EINVAL; 492 return NULL; 493 } 494 } else { /* unpriv, SPD has policy */ 495 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 496 if (sp == NULL) { /* no SP found */ 497 switch (currsp->policy) { 498 case IPSEC_POLICY_BYPASS: 499 IPSECLOG(LOG_ERR, "Illegal policy for " 500 "non-priviliged defined %d\n", 501 currsp->policy); 502 *error = EINVAL; 503 return NULL; 504 505 case IPSEC_POLICY_ENTRUST: 506 sp = KEY_GET_DEFAULT_SP(af); 507 break; 508 509 case IPSEC_POLICY_IPSEC: 510 KEY_SP_REF(currsp); 511 sp = currsp; 512 break; 513 514 default: 515 IPSECLOG(LOG_ERR, "Invalid policy for " 516 "PCB %d\n", currsp->policy); 517 *error = EINVAL; 518 return NULL; 519 } 520 } 521 } 522 KASSERTMSG(sp != NULL, "null SP (priv %u policy %u", pcbsp->priv, 523 currsp->policy); 524 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 525 "DP (priv %u policy %u) allocates SP:%p (refcnt %u)\n", 526 pcbsp->priv, currsp->policy, sp, key_sp_refcnt(sp)); 527 ipsec_fillpcbcache(pcbsp, m, sp, dir); 528 return sp; 529 } 530 531 /* 532 * For FORWARDING packet or OUTBOUND without a socket. Searching SPD for packet, 533 * and return a pointer to SP. 534 * OUT: positive: a pointer to the entry for security policy leaf matched. 535 * NULL: no apropreate SP found, the following value is set to error. 536 * 0 : bypass 537 * EACCES : discard packet. 538 * ENOENT : ipsec_acquire() in progress, maybe. 539 * others : error occurred. 540 */ 541 static struct secpolicy * 542 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 543 { 544 struct secpolicyindex spidx; 545 struct secpolicy *sp; 546 547 KASSERT(m != NULL); 548 KASSERT(error != NULL); 549 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 550 551 sp = NULL; 552 553 /* Make an index to look for a policy. */ 554 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 555 if (*error != 0) { 556 IPSECLOG(LOG_DEBUG, "setpidx failed, dir %u flag %u\n", dir, flag); 557 memset(&spidx, 0, sizeof(spidx)); 558 return NULL; 559 } 560 561 spidx.dir = dir; 562 563 if (key_havesp(dir)) { 564 sp = KEY_LOOKUP_SP_BYSPIDX(&spidx, dir); 565 } 566 567 if (sp == NULL) /* no SP found, use system default */ 568 sp = KEY_GET_DEFAULT_SP(spidx.dst.sa.sa_family); 569 KASSERT(sp != NULL); 570 return sp; 571 } 572 573 static struct secpolicy * 574 ipsec_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 575 void *inp) 576 { 577 struct secpolicy *sp; 578 579 *error = 0; 580 581 if (inp == NULL) { 582 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 583 } else { 584 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 585 KASSERT(inph->inph_socket != NULL); 586 sp = ipsec_getpolicybysock(m, dir, inph, error); 587 } 588 if (sp == NULL) { 589 KASSERTMSG(*error != 0, "getpolicy failed w/o error"); 590 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 591 return NULL; 592 } 593 KASSERTMSG(*error == 0, "sp w/ error set to %u", *error); 594 595 switch (sp->policy) { 596 case IPSEC_POLICY_ENTRUST: 597 default: 598 printf("%s: invalid policy %u\n", __func__, sp->policy); 599 /* fall thru... */ 600 case IPSEC_POLICY_DISCARD: 601 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 602 *error = -EINVAL; /* packet is discarded by caller */ 603 break; 604 case IPSEC_POLICY_BYPASS: 605 case IPSEC_POLICY_NONE: 606 KEY_SP_UNREF(&sp); 607 sp = NULL; /* NB: force NULL result */ 608 break; 609 case IPSEC_POLICY_IPSEC: 610 KASSERT(sp->req != NULL); 611 break; 612 } 613 614 if (*error != 0) { 615 KEY_SP_UNREF(&sp); 616 sp = NULL; 617 IPSECLOG(LOG_DEBUG, "done, error %d\n", *error); 618 } 619 620 return sp; 621 } 622 623 int 624 ipsec4_output(struct mbuf *m, struct inpcb *inp, int flags, 625 u_long *mtu, bool *natt_frag, bool *done) 626 { 627 struct secpolicy *sp = NULL; 628 int error, s; 629 630 /* 631 * Check the security policy (SP) for the packet and, if required, 632 * do IPsec-related processing. There are two cases here; the first 633 * time a packet is sent through it will be untagged and handled by 634 * ipsec_checkpolicy(). If the packet is resubmitted to ip_output 635 * (e.g. after AH, ESP, etc. processing), there will be a tag to 636 * bypass the lookup and related policy checking. 637 */ 638 if (ipsec_outdone(m)) { 639 return 0; 640 } 641 s = splsoftnet(); 642 if (inp && ipsec_pcb_skip_ipsec(inp->inp_sp, IPSEC_DIR_OUTBOUND)) { 643 splx(s); 644 return 0; 645 } 646 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, inp); 647 648 /* 649 * There are four return cases: 650 * sp != NULL apply IPsec policy 651 * sp == NULL, error == 0 no IPsec handling needed 652 * sp == NULL, error == -EINVAL discard packet w/o error 653 * sp == NULL, error != 0 discard packet, report error 654 */ 655 if (sp == NULL) { 656 splx(s); 657 if (error) { 658 /* 659 * Hack: -EINVAL is used to signal that a packet 660 * should be silently discarded. This is typically 661 * because we asked key management for an SA and 662 * it was delayed (e.g. kicked up to IKE). 663 */ 664 if (error == -EINVAL) 665 error = 0; 666 m_freem(m); 667 *done = true; 668 return error; 669 } 670 /* No IPsec processing for this packet. */ 671 return 0; 672 } 673 674 /* 675 * Do delayed checksums now because we send before 676 * this is done in the normal processing path. 677 */ 678 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 679 in_delayed_cksum(m); 680 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 681 } 682 683 { 684 u_long _mtu = 0; 685 686 error = ipsec4_process_packet(m, sp->req, &_mtu); 687 688 if (error == 0 && _mtu != 0) { 689 /* 690 * NAT-T ESP fragmentation: do not do IPSec processing 691 * now, we will do it on each fragmented packet. 692 */ 693 *mtu = _mtu; 694 *natt_frag = true; 695 KEY_SP_UNREF(&sp); 696 splx(s); 697 return 0; 698 } 699 } 700 701 /* 702 * Preserve KAME behaviour: ENOENT can be returned 703 * when an SA acquire is in progress. Don't propagate 704 * this to user-level; it confuses applications. 705 * 706 * XXX this will go away when the SADB is redone. 707 */ 708 if (error == ENOENT) 709 error = 0; 710 KEY_SP_UNREF(&sp); 711 splx(s); 712 *done = true; 713 return error; 714 } 715 716 int 717 ipsec4_input(struct mbuf *m, int flags) 718 { 719 struct secpolicy *sp; 720 int error, s; 721 722 s = splsoftnet(); 723 error = ipsec_in_reject(m, NULL); 724 splx(s); 725 if (error) { 726 return EINVAL; 727 } 728 729 if (flags == 0) { 730 /* We are done. */ 731 return 0; 732 } 733 734 /* 735 * Peek at the outbound SP for this packet to determine if 736 * it is a Fast Forward candidate. 737 */ 738 s = splsoftnet(); 739 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, NULL); 740 if (sp != NULL) { 741 m->m_flags &= ~M_CANFASTFWD; 742 KEY_SP_UNREF(&sp); 743 } 744 splx(s); 745 return 0; 746 } 747 748 int 749 ipsec4_forward(struct mbuf *m, int *destmtu) 750 { 751 /* 752 * If the packet is routed over IPsec tunnel, tell the 753 * originator the tunnel MTU. 754 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 755 * XXX quickhack!!! 756 */ 757 struct secpolicy *sp; 758 size_t ipsechdr; 759 int error; 760 761 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, IP_FORWARDING, 762 &error); 763 if (sp == NULL) { 764 return EINVAL; 765 } 766 767 /* Count IPsec header size. */ 768 ipsechdr = ipsec_sp_hdrsiz(sp, m); 769 770 /* 771 * Find the correct route for outer IPv4 header, compute tunnel MTU. 772 */ 773 if (sp->req) { 774 struct secasvar *sav; 775 776 sav = ipsec_lookup_sa(sp->req, m); 777 if (sav != NULL) { 778 struct route *ro; 779 struct rtentry *rt; 780 781 ro = &sav->sah->sa_route; 782 rt = rtcache_validate(ro); 783 if (rt && rt->rt_ifp) { 784 *destmtu = rt->rt_rmx.rmx_mtu ? 785 rt->rt_rmx.rmx_mtu : rt->rt_ifp->if_mtu; 786 *destmtu -= ipsechdr; 787 } 788 rtcache_unref(rt, ro); 789 KEY_SA_UNREF(&sav); 790 } 791 } 792 KEY_SP_UNREF(&sp); 793 return 0; 794 } 795 796 static int 797 ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) 798 { 799 int error; 800 801 KASSERT(pcb != NULL); 802 KASSERT(pcb->inp_sp != NULL); 803 KASSERT(pcb->inp_sp->sp_out != NULL); 804 KASSERT(pcb->inp_sp->sp_in != NULL); 805 806 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 807 if (error == 0) { 808 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 809 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 810 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 811 } else { 812 memset(&pcb->inp_sp->sp_in->spidx, 0, 813 sizeof(pcb->inp_sp->sp_in->spidx)); 814 memset(&pcb->inp_sp->sp_out->spidx, 0, 815 sizeof(pcb->inp_sp->sp_out->spidx)); 816 } 817 return error; 818 } 819 820 #ifdef INET6 821 static int 822 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) 823 { 824 int error; 825 826 KASSERT(pcb != NULL); 827 KASSERT(pcb->in6p_sp != NULL); 828 KASSERT(pcb->in6p_sp->sp_out != NULL); 829 KASSERT(pcb->in6p_sp->sp_in != NULL); 830 831 error = ipsec_setspidx(m, &pcb->in6p_sp->sp_in->spidx, 1); 832 if (error == 0) { 833 pcb->in6p_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 834 pcb->in6p_sp->sp_out->spidx = pcb->in6p_sp->sp_in->spidx; 835 pcb->in6p_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 836 } else { 837 memset(&pcb->in6p_sp->sp_in->spidx, 0, 838 sizeof(pcb->in6p_sp->sp_in->spidx)); 839 memset(&pcb->in6p_sp->sp_out->spidx, 0, 840 sizeof(pcb->in6p_sp->sp_out->spidx)); 841 } 842 return error; 843 } 844 #endif 845 846 /* 847 * configure security policy index (src/dst/proto/sport/dport) 848 * by looking at the content of mbuf. 849 * the caller is responsible for error recovery (like clearing up spidx). 850 */ 851 static int 852 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 853 { 854 struct ip *ip = NULL; 855 struct ip ipbuf; 856 u_int v; 857 struct mbuf *n; 858 int len; 859 int error; 860 861 KASSERT(m != NULL); 862 863 /* 864 * validate m->m_pkthdr.len. we see incorrect length if we 865 * mistakenly call this function with inconsistent mbuf chain 866 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 867 */ 868 len = 0; 869 for (n = m; n; n = n->m_next) 870 len += n->m_len; 871 if (m->m_pkthdr.len != len) { 872 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 873 "total of m_len(%d) != pkthdr.len(%d), ignored.\n", 874 len, m->m_pkthdr.len); 875 KASSERTMSG(0, "impossible"); 876 return EINVAL; 877 } 878 879 if (m->m_pkthdr.len < sizeof(struct ip)) { 880 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 881 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 882 m->m_pkthdr.len); 883 return EINVAL; 884 } 885 886 if (m->m_len >= sizeof(*ip)) { 887 ip = mtod(m, struct ip *); 888 } else { 889 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 890 ip = &ipbuf; 891 } 892 v = ip->ip_v; 893 switch (v) { 894 case 4: 895 error = ipsec4_setspidx_ipaddr(m, spidx); 896 if (error) 897 return error; 898 ipsec4_get_ulp(m, spidx, needport); 899 return 0; 900 #ifdef INET6 901 case 6: 902 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 903 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 904 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 905 "ignored.\n", m->m_pkthdr.len); 906 return EINVAL; 907 } 908 error = ipsec6_setspidx_ipaddr(m, spidx); 909 if (error) 910 return error; 911 ipsec6_get_ulp(m, spidx, needport); 912 return 0; 913 #endif 914 default: 915 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 916 "unknown IP version %u, ignored.\n", v); 917 return EINVAL; 918 } 919 } 920 921 static void 922 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 923 { 924 u_int8_t nxt; 925 int off; 926 927 KASSERT(m != NULL); 928 KASSERTMSG(m->m_pkthdr.len >= sizeof(struct ip), "packet too short"); 929 930 /* NB: ip_input() flips it into host endian XXX need more checking */ 931 if (m->m_len >= sizeof(struct ip)) { 932 struct ip *ip = mtod(m, struct ip *); 933 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) 934 goto done; 935 off = ip->ip_hl << 2; 936 nxt = ip->ip_p; 937 } else { 938 struct ip ih; 939 940 m_copydata(m, 0, sizeof(struct ip), &ih); 941 if (ih.ip_off & htons(IP_MF | IP_OFFMASK)) 942 goto done; 943 off = ih.ip_hl << 2; 944 nxt = ih.ip_p; 945 } 946 947 while (off < m->m_pkthdr.len) { 948 struct ip6_ext ip6e; 949 struct tcphdr th; 950 struct udphdr uh; 951 struct icmp icmph; 952 953 switch (nxt) { 954 case IPPROTO_TCP: 955 spidx->ul_proto = nxt; 956 if (!needport) 957 goto done_proto; 958 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 959 goto done; 960 m_copydata(m, off, sizeof(th), &th); 961 spidx->src.sin.sin_port = th.th_sport; 962 spidx->dst.sin.sin_port = th.th_dport; 963 return; 964 case IPPROTO_UDP: 965 spidx->ul_proto = nxt; 966 if (!needport) 967 goto done_proto; 968 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 969 goto done; 970 m_copydata(m, off, sizeof(uh), &uh); 971 spidx->src.sin.sin_port = uh.uh_sport; 972 spidx->dst.sin.sin_port = uh.uh_dport; 973 return; 974 case IPPROTO_AH: 975 if (off + sizeof(ip6e) > m->m_pkthdr.len) 976 goto done; 977 /* XXX sigh, this works but is totally bogus */ 978 m_copydata(m, off, sizeof(ip6e), &ip6e); 979 off += (ip6e.ip6e_len + 2) << 2; 980 nxt = ip6e.ip6e_nxt; 981 break; 982 case IPPROTO_ICMP: 983 spidx->ul_proto = nxt; 984 if (off + sizeof(struct icmp) > m->m_pkthdr.len) 985 goto done; 986 m_copydata(m, off, sizeof(icmph), &icmph); 987 ((struct sockaddr_in *)&spidx->src)->sin_port = 988 htons((uint16_t)icmph.icmp_type); 989 ((struct sockaddr_in *)&spidx->dst)->sin_port = 990 htons((uint16_t)icmph.icmp_code); 991 return; 992 default: 993 /* XXX intermediate headers??? */ 994 spidx->ul_proto = nxt; 995 goto done_proto; 996 } 997 } 998 done: 999 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1000 done_proto: 1001 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1002 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1003 } 1004 1005 static int 1006 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1007 { 1008 static const struct sockaddr_in template = { 1009 sizeof(struct sockaddr_in), 1010 AF_INET, 1011 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1012 }; 1013 1014 spidx->src.sin = template; 1015 spidx->dst.sin = template; 1016 1017 if (m->m_len < sizeof(struct ip)) { 1018 m_copydata(m, offsetof(struct ip, ip_src), 1019 sizeof(struct in_addr), &spidx->src.sin.sin_addr); 1020 m_copydata(m, offsetof(struct ip, ip_dst), 1021 sizeof(struct in_addr), &spidx->dst.sin.sin_addr); 1022 } else { 1023 struct ip *ip = mtod(m, struct ip *); 1024 spidx->src.sin.sin_addr = ip->ip_src; 1025 spidx->dst.sin.sin_addr = ip->ip_dst; 1026 } 1027 1028 spidx->prefs = sizeof(struct in_addr) << 3; 1029 spidx->prefd = sizeof(struct in_addr) << 3; 1030 1031 return 0; 1032 } 1033 1034 #ifdef INET6 1035 static void 1036 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 1037 { 1038 int off, nxt; 1039 struct tcphdr th; 1040 struct udphdr uh; 1041 struct icmp6_hdr icmph; 1042 1043 KASSERT(m != NULL); 1044 1045 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1046 kdebug_mbuf(__func__, m); 1047 } 1048 1049 /* set default */ 1050 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1051 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1052 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1053 1054 nxt = -1; 1055 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1056 if (off < 0 || m->m_pkthdr.len < off) 1057 return; 1058 1059 switch (nxt) { 1060 case IPPROTO_TCP: 1061 spidx->ul_proto = nxt; 1062 if (!needport) 1063 break; 1064 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1065 break; 1066 m_copydata(m, off, sizeof(th), &th); 1067 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1068 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1069 break; 1070 case IPPROTO_UDP: 1071 spidx->ul_proto = nxt; 1072 if (!needport) 1073 break; 1074 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1075 break; 1076 m_copydata(m, off, sizeof(uh), &uh); 1077 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1078 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1079 break; 1080 case IPPROTO_ICMPV6: 1081 spidx->ul_proto = nxt; 1082 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 1083 break; 1084 m_copydata(m, off, sizeof(icmph), &icmph); 1085 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 1086 htons((uint16_t)icmph.icmp6_type); 1087 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 1088 htons((uint16_t)icmph.icmp6_code); 1089 break; 1090 default: 1091 /* XXX intermediate headers??? */ 1092 spidx->ul_proto = nxt; 1093 break; 1094 } 1095 } 1096 1097 static int 1098 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1099 { 1100 struct ip6_hdr *ip6 = NULL; 1101 struct ip6_hdr ip6buf; 1102 struct sockaddr_in6 *sin6; 1103 1104 if (m->m_len >= sizeof(*ip6)) 1105 ip6 = mtod(m, struct ip6_hdr *); 1106 else { 1107 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1108 ip6 = &ip6buf; 1109 } 1110 1111 sin6 = (struct sockaddr_in6 *)&spidx->src; 1112 memset(sin6, 0, sizeof(*sin6)); 1113 sin6->sin6_family = AF_INET6; 1114 sin6->sin6_len = sizeof(struct sockaddr_in6); 1115 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); 1116 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1117 sin6->sin6_addr.s6_addr16[1] = 0; 1118 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1119 } 1120 spidx->prefs = sizeof(struct in6_addr) << 3; 1121 1122 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1123 memset(sin6, 0, sizeof(*sin6)); 1124 sin6->sin6_family = AF_INET6; 1125 sin6->sin6_len = sizeof(struct sockaddr_in6); 1126 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); 1127 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1128 sin6->sin6_addr.s6_addr16[1] = 0; 1129 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1130 } 1131 spidx->prefd = sizeof(struct in6_addr) << 3; 1132 1133 return 0; 1134 } 1135 #endif 1136 1137 static void 1138 ipsec_delpcbpolicy(struct inpcbpolicy *p) 1139 { 1140 1141 kmem_intr_free(p, sizeof(*p)); 1142 } 1143 1144 /* initialize policy in PCB */ 1145 int 1146 ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) 1147 { 1148 struct inpcbpolicy *new; 1149 1150 KASSERT(so != NULL); 1151 KASSERT(policy != NULL); 1152 1153 new = kmem_intr_zalloc(sizeof(*new), KM_NOSLEEP); 1154 if (new == NULL) { 1155 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1156 return ENOBUFS; 1157 } 1158 1159 if (IPSEC_PRIVILEGED_SO(so)) 1160 new->priv = 1; 1161 else 1162 new->priv = 0; 1163 1164 /* 1165 * Set dummy SPs. Actual SPs will be allocated later if needed. 1166 */ 1167 new->sp_in = &ipsec_dummy_sp; 1168 new->sp_out = &ipsec_dummy_sp; 1169 1170 *policy = new; 1171 1172 return 0; 1173 } 1174 1175 #if 0 /* unused */ 1176 /* copy old ipsec policy into new */ 1177 int 1178 ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) 1179 { 1180 struct secpolicy *sp; 1181 1182 sp = ipsec_deepcopy_policy(old->sp_in); 1183 if (sp) { 1184 KEY_SP_UNREF(&new->sp_in); 1185 new->sp_in = sp; 1186 } else 1187 return ENOBUFS; 1188 1189 sp = ipsec_deepcopy_policy(old->sp_out); 1190 if (sp) { 1191 KEY_SP_UNREF(&new->sp_out); 1192 new->sp_out = sp; 1193 } else 1194 return ENOBUFS; 1195 1196 new->priv = old->priv; 1197 1198 return 0; 1199 } 1200 1201 /* deep-copy a policy in PCB */ 1202 static struct secpolicy * 1203 ipsec_deepcopy_policy(const struct secpolicy *src) 1204 { 1205 struct ipsecrequest *newchain = NULL; 1206 const struct ipsecrequest *p; 1207 struct ipsecrequest **q; 1208 struct secpolicy *dst; 1209 1210 if (src == NULL) 1211 return NULL; 1212 dst = KEY_NEWSP(); 1213 if (dst == NULL) 1214 return NULL; 1215 1216 /* 1217 * deep-copy IPsec request chain. This is required since struct 1218 * ipsecrequest is not reference counted. 1219 */ 1220 q = &newchain; 1221 for (p = src->req; p; p = p->next) { 1222 *q = kmem_zalloc(sizeof(**q), KM_SLEEP); 1223 (*q)->next = NULL; 1224 1225 (*q)->saidx.proto = p->saidx.proto; 1226 (*q)->saidx.mode = p->saidx.mode; 1227 (*q)->level = p->level; 1228 (*q)->saidx.reqid = p->saidx.reqid; 1229 1230 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); 1231 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); 1232 1233 (*q)->sp = dst; 1234 1235 q = &((*q)->next); 1236 } 1237 1238 dst->req = newchain; 1239 dst->state = src->state; 1240 dst->policy = src->policy; 1241 /* do not touch the refcnt fields */ 1242 1243 return dst; 1244 } 1245 #endif 1246 1247 static void 1248 ipsec_destroy_policy(struct secpolicy *sp) 1249 { 1250 1251 if (sp == &ipsec_dummy_sp) 1252 ; /* It's dummy. No need to free it. */ 1253 else { 1254 /* 1255 * We cannot destroy here because it can be called in 1256 * softint. So mark the SP as DEAD and let the timer 1257 * destroy it. See key_timehandler_spd. 1258 */ 1259 sp->state = IPSEC_SPSTATE_DEAD; 1260 } 1261 } 1262 1263 int 1264 ipsec_set_policy(void *inp, int optname, const void *request, size_t len, 1265 kauth_cred_t cred) 1266 { 1267 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1268 const struct sadb_x_policy *xpl; 1269 struct secpolicy *newsp, *oldsp; 1270 struct secpolicy **policy; 1271 int error; 1272 1273 KASSERT(!cpu_softintr_p()); 1274 KASSERT(inph != NULL); 1275 KASSERT(inph_locked(inph)); 1276 KASSERT(request != NULL); 1277 1278 if (len < sizeof(*xpl)) 1279 return EINVAL; 1280 xpl = (const struct sadb_x_policy *)request; 1281 1282 KASSERT(inph->inph_sp != NULL); 1283 1284 /* select direction */ 1285 switch (xpl->sadb_x_policy_dir) { 1286 case IPSEC_DIR_INBOUND: 1287 policy = &inph->inph_sp->sp_in; 1288 break; 1289 case IPSEC_DIR_OUTBOUND: 1290 policy = &inph->inph_sp->sp_out; 1291 break; 1292 default: 1293 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1294 xpl->sadb_x_policy_dir); 1295 return EINVAL; 1296 } 1297 1298 /* sanity check. */ 1299 if (policy == NULL || *policy == NULL) 1300 return EINVAL; 1301 1302 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1303 kdebug_sadb_xpolicy("set passed policy", request); 1304 } 1305 1306 /* check policy type */ 1307 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1308 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD || 1309 xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1310 return EINVAL; 1311 1312 /* check privileged socket */ 1313 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1314 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, 1315 KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); 1316 if (error) 1317 return error; 1318 } 1319 1320 /* allocation new SP entry */ 1321 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1322 return error; 1323 1324 key_init_sp(newsp); 1325 newsp->created = time_uptime; 1326 /* Insert the global list for SPs for sockets */ 1327 key_socksplist_add(newsp); 1328 1329 /* clear old SP and set new SP */ 1330 oldsp = *policy; 1331 *policy = newsp; 1332 ipsec_destroy_policy(oldsp); 1333 1334 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1335 printf("%s: new policy\n", __func__); 1336 kdebug_secpolicy(newsp); 1337 } 1338 1339 return 0; 1340 } 1341 1342 int 1343 ipsec_get_policy(void *inp, const void *request, size_t len, 1344 struct mbuf **mp) 1345 { 1346 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1347 const struct sadb_x_policy *xpl; 1348 struct secpolicy *policy; 1349 1350 /* sanity check. */ 1351 if (inph == NULL || request == NULL || mp == NULL) 1352 return EINVAL; 1353 KASSERT(inph->inph_sp != NULL); 1354 if (len < sizeof(*xpl)) 1355 return EINVAL; 1356 xpl = (const struct sadb_x_policy *)request; 1357 1358 /* select direction */ 1359 switch (xpl->sadb_x_policy_dir) { 1360 case IPSEC_DIR_INBOUND: 1361 policy = inph->inph_sp->sp_in; 1362 break; 1363 case IPSEC_DIR_OUTBOUND: 1364 policy = inph->inph_sp->sp_out; 1365 break; 1366 default: 1367 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1368 xpl->sadb_x_policy_dir); 1369 return EINVAL; 1370 } 1371 1372 if (policy == NULL) 1373 return EINVAL; 1374 1375 *mp = key_sp2msg(policy, M_NOWAIT); 1376 if (!*mp) { 1377 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1378 return ENOBUFS; 1379 } 1380 1381 (*mp)->m_type = MT_DATA; 1382 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1383 kdebug_mbuf(__func__, *mp); 1384 } 1385 1386 return 0; 1387 } 1388 1389 int 1390 ipsec_delete_pcbpolicy(void *inp) 1391 { 1392 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1393 1394 KASSERT(inph != NULL); 1395 1396 if (inph->inph_sp == NULL) 1397 return 0; 1398 1399 if (inph->inph_sp->sp_in != NULL) 1400 ipsec_destroy_policy(inph->inph_sp->sp_in); 1401 1402 if (inph->inph_sp->sp_out != NULL) 1403 ipsec_destroy_policy(inph->inph_sp->sp_out); 1404 1405 ipsec_invalpcbcache(inph->inph_sp, IPSEC_DIR_ANY); 1406 1407 ipsec_delpcbpolicy(inph->inph_sp); 1408 inph->inph_sp = NULL; 1409 1410 return 0; 1411 } 1412 1413 /* 1414 * Return the current level (either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE). 1415 */ 1416 u_int 1417 ipsec_get_reqlevel(const struct ipsecrequest *isr) 1418 { 1419 u_int level = 0; 1420 u_int esp_trans_deflev, esp_net_deflev; 1421 u_int ah_trans_deflev, ah_net_deflev; 1422 1423 KASSERT(isr != NULL); 1424 KASSERT(isr->sp != NULL); 1425 KASSERTMSG( 1426 isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1427 "af family mismatch, src %u, dst %u", 1428 isr->sp->spidx.src.sa.sa_family, isr->sp->spidx.dst.sa.sa_family); 1429 1430 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1431 #define IPSEC_CHECK_DEFAULT(lev) \ 1432 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1433 && (lev) != IPSEC_LEVEL_UNIQUE) ? \ 1434 (ipsec_debug ? log(LOG_INFO, "fixed system default level " #lev \ 1435 ":%d->%d\n", (lev), IPSEC_LEVEL_REQUIRE) : (void)0), \ 1436 (lev) = IPSEC_LEVEL_REQUIRE, (lev) \ 1437 : (lev)) 1438 1439 /* set default level */ 1440 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1441 #ifdef INET 1442 case AF_INET: 1443 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1444 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1445 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1446 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1447 break; 1448 #endif 1449 #ifdef INET6 1450 case AF_INET6: 1451 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1452 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1453 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1454 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1455 break; 1456 #endif /* INET6 */ 1457 default: 1458 panic("%s: unknown af %u", __func__, 1459 isr->sp->spidx.src.sa.sa_family); 1460 } 1461 1462 #undef IPSEC_CHECK_DEFAULT 1463 1464 /* set level */ 1465 switch (isr->level) { 1466 case IPSEC_LEVEL_DEFAULT: 1467 switch (isr->saidx.proto) { 1468 case IPPROTO_ESP: 1469 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1470 level = esp_net_deflev; 1471 else 1472 level = esp_trans_deflev; 1473 break; 1474 case IPPROTO_AH: 1475 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1476 level = ah_net_deflev; 1477 else 1478 level = ah_trans_deflev; 1479 break; 1480 case IPPROTO_IPCOMP: 1481 /* 1482 * we don't really care, as IPcomp document says that 1483 * we shouldn't compress small packets 1484 */ 1485 level = IPSEC_LEVEL_USE; 1486 break; 1487 default: 1488 panic("%s: Illegal protocol defined %u", __func__, 1489 isr->saidx.proto); 1490 } 1491 break; 1492 1493 case IPSEC_LEVEL_USE: 1494 case IPSEC_LEVEL_REQUIRE: 1495 level = isr->level; 1496 break; 1497 case IPSEC_LEVEL_UNIQUE: 1498 level = IPSEC_LEVEL_REQUIRE; 1499 break; 1500 1501 default: 1502 panic("%s: Illegal IPsec level %u", __func__, isr->level); 1503 } 1504 1505 return level; 1506 } 1507 1508 /* 1509 * Check security policy requirements against the actual packet contents. 1510 * 1511 * If the SP requires an IPsec packet, and the packet was neither AH nor ESP, 1512 * then kick it. 1513 */ 1514 int 1515 ipsec_sp_reject(const struct secpolicy *sp, const struct mbuf *m) 1516 { 1517 struct ipsecrequest *isr; 1518 1519 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1520 printf("%s: using SP\n", __func__); 1521 kdebug_secpolicy(sp); 1522 } 1523 1524 /* check policy */ 1525 switch (sp->policy) { 1526 case IPSEC_POLICY_DISCARD: 1527 return 1; 1528 case IPSEC_POLICY_BYPASS: 1529 case IPSEC_POLICY_NONE: 1530 return 0; 1531 } 1532 1533 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1534 "invalid policy %u", sp->policy); 1535 1536 /* XXX should compare policy against ipsec header history */ 1537 1538 for (isr = sp->req; isr != NULL; isr = isr->next) { 1539 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1540 continue; 1541 switch (isr->saidx.proto) { 1542 case IPPROTO_ESP: 1543 if ((m->m_flags & M_DECRYPTED) == 0) { 1544 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1545 "ESP m_flags:%x\n", m->m_flags); 1546 return 1; 1547 } 1548 break; 1549 case IPPROTO_AH: 1550 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1551 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1552 "AH m_flags:%x\n", m->m_flags); 1553 return 1; 1554 } 1555 break; 1556 case IPPROTO_IPCOMP: 1557 /* 1558 * We don't really care, as IPcomp document 1559 * says that we shouldn't compress small 1560 * packets, IPComp policy should always be 1561 * treated as being in "use" level. 1562 */ 1563 break; 1564 } 1565 } 1566 1567 return 0; 1568 } 1569 1570 /* 1571 * Check security policy requirements. 1572 */ 1573 int 1574 ipsec_in_reject(struct mbuf *m, void *inp) 1575 { 1576 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1577 struct secpolicy *sp; 1578 int error; 1579 int result; 1580 1581 KASSERT(m != NULL); 1582 1583 if (inph == NULL) 1584 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 1585 IP_FORWARDING, &error); 1586 else 1587 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1588 inph, &error); 1589 1590 if (sp != NULL) { 1591 result = ipsec_sp_reject(sp, m); 1592 if (result) 1593 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1594 KEY_SP_UNREF(&sp); 1595 } else { 1596 result = 0; 1597 } 1598 return result; 1599 } 1600 1601 /* 1602 * Compute the byte size to be occupied by the IPsec header. If it is 1603 * tunneled, it includes the size of outer IP header. 1604 */ 1605 static size_t 1606 ipsec_sp_hdrsiz(const struct secpolicy *sp, const struct mbuf *m) 1607 { 1608 struct ipsecrequest *isr; 1609 size_t siz; 1610 1611 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1612 printf("%s: using SP\n", __func__); 1613 kdebug_secpolicy(sp); 1614 } 1615 1616 switch (sp->policy) { 1617 case IPSEC_POLICY_DISCARD: 1618 case IPSEC_POLICY_BYPASS: 1619 case IPSEC_POLICY_NONE: 1620 return 0; 1621 } 1622 1623 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1624 "invalid policy %u", sp->policy); 1625 1626 siz = 0; 1627 for (isr = sp->req; isr != NULL; isr = isr->next) { 1628 size_t clen = 0; 1629 struct secasvar *sav; 1630 1631 switch (isr->saidx.proto) { 1632 case IPPROTO_ESP: 1633 sav = ipsec_lookup_sa(isr, m); 1634 if (sav != NULL) { 1635 clen = esp_hdrsiz(sav); 1636 KEY_SA_UNREF(&sav); 1637 } else 1638 clen = esp_hdrsiz(NULL); 1639 break; 1640 case IPPROTO_AH: 1641 sav = ipsec_lookup_sa(isr, m); 1642 if (sav != NULL) { 1643 clen = ah_hdrsiz(sav); 1644 KEY_SA_UNREF(&sav); 1645 } else 1646 clen = ah_hdrsiz(NULL); 1647 break; 1648 case IPPROTO_IPCOMP: 1649 clen = sizeof(struct ipcomp); 1650 break; 1651 } 1652 1653 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1654 switch (isr->saidx.dst.sa.sa_family) { 1655 case AF_INET: 1656 clen += sizeof(struct ip); 1657 break; 1658 #ifdef INET6 1659 case AF_INET6: 1660 clen += sizeof(struct ip6_hdr); 1661 break; 1662 #endif 1663 default: 1664 IPSECLOG(LOG_ERR, "unknown AF %d in " 1665 "IPsec tunnel SA\n", 1666 ((const struct sockaddr *)&isr->saidx.dst) 1667 ->sa_family); 1668 break; 1669 } 1670 } 1671 siz += clen; 1672 } 1673 1674 return siz; 1675 } 1676 1677 size_t 1678 ipsec_hdrsiz(struct mbuf *m, u_int dir, void *inp) 1679 { 1680 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1681 struct secpolicy *sp; 1682 int error; 1683 size_t size; 1684 1685 KASSERT(m != NULL); 1686 KASSERTMSG(inph == NULL || inph->inph_socket != NULL, 1687 "socket w/o inpcb"); 1688 1689 if (inph == NULL) 1690 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1691 else 1692 sp = ipsec_getpolicybysock(m, dir, inph, &error); 1693 1694 if (sp != NULL) { 1695 size = ipsec_sp_hdrsiz(sp, m); 1696 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DATA, "size:%zu.\n", size); 1697 KEY_SP_UNREF(&sp); 1698 } else { 1699 size = 0; 1700 } 1701 1702 return size; 1703 } 1704 1705 /* 1706 * Check the variable replay window. 1707 * ipsec_chkreplay() performs replay check before ICV verification. 1708 * ipsec_updatereplay() updates replay bitmap. This must be called after 1709 * ICV verification (it also performs replay check, which is usually done 1710 * beforehand). 1711 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1712 * 1713 * based on RFC 2401. 1714 */ 1715 int 1716 ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) 1717 { 1718 const struct secreplay *replay; 1719 u_int32_t diff; 1720 int fr; 1721 u_int32_t wsizeb; /* constant: bits of window size */ 1722 int frlast; /* constant: last frame */ 1723 1724 IPSEC_SPLASSERT_SOFTNET(__func__); 1725 1726 KASSERT(sav != NULL); 1727 KASSERT(sav->replay != NULL); 1728 1729 replay = sav->replay; 1730 1731 if (replay->wsize == 0) 1732 return 1; /* no need to check replay. */ 1733 1734 /* constant */ 1735 frlast = replay->wsize - 1; 1736 wsizeb = replay->wsize << 3; 1737 1738 /* sequence number of 0 is invalid */ 1739 if (seq == 0) 1740 return 0; 1741 1742 /* first time is always okay */ 1743 if (replay->count == 0) 1744 return 1; 1745 1746 if (seq > replay->lastseq) { 1747 /* larger sequences are okay */ 1748 return 1; 1749 } else { 1750 /* seq is equal or less than lastseq. */ 1751 diff = replay->lastseq - seq; 1752 1753 /* over range to check, i.e. too old or wrapped */ 1754 if (diff >= wsizeb) 1755 return 0; 1756 1757 fr = frlast - diff / 8; 1758 1759 /* this packet already seen ? */ 1760 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1761 return 0; 1762 1763 /* out of order but good */ 1764 return 1; 1765 } 1766 } 1767 1768 /* 1769 * check replay counter whether to update or not. 1770 * OUT: 0: OK 1771 * 1: NG 1772 */ 1773 int 1774 ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) 1775 { 1776 struct secreplay *replay; 1777 u_int32_t diff; 1778 int fr; 1779 u_int32_t wsizeb; /* constant: bits of window size */ 1780 int frlast; /* constant: last frame */ 1781 1782 IPSEC_SPLASSERT_SOFTNET(__func__); 1783 1784 KASSERT(sav != NULL); 1785 KASSERT(sav->replay != NULL); 1786 1787 replay = sav->replay; 1788 1789 if (replay->wsize == 0) 1790 goto ok; /* no need to check replay. */ 1791 1792 /* constant */ 1793 frlast = replay->wsize - 1; 1794 wsizeb = replay->wsize << 3; 1795 1796 /* sequence number of 0 is invalid */ 1797 if (seq == 0) 1798 return 1; 1799 1800 /* first time */ 1801 if (replay->count == 0) { 1802 replay->lastseq = seq; 1803 memset(replay->bitmap, 0, replay->wsize); 1804 (replay->bitmap)[frlast] = 1; 1805 goto ok; 1806 } 1807 1808 if (seq > replay->lastseq) { 1809 /* seq is larger than lastseq. */ 1810 diff = seq - replay->lastseq; 1811 1812 /* new larger sequence number */ 1813 if (diff < wsizeb) { 1814 /* In window */ 1815 /* set bit for this packet */ 1816 vshiftl(replay->bitmap, diff, replay->wsize); 1817 (replay->bitmap)[frlast] |= 1; 1818 } else { 1819 /* this packet has a "way larger" */ 1820 memset(replay->bitmap, 0, replay->wsize); 1821 (replay->bitmap)[frlast] = 1; 1822 } 1823 replay->lastseq = seq; 1824 1825 /* larger is good */ 1826 } else { 1827 /* seq is equal or less than lastseq. */ 1828 diff = replay->lastseq - seq; 1829 1830 /* over range to check, i.e. too old or wrapped */ 1831 if (diff >= wsizeb) 1832 return 1; 1833 1834 fr = frlast - diff / 8; 1835 1836 /* this packet already seen ? */ 1837 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1838 return 1; 1839 1840 /* mark as seen */ 1841 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1842 1843 /* out of order but good */ 1844 } 1845 1846 ok: 1847 if (replay->count == ~0) { 1848 char buf[IPSEC_LOGSASTRLEN]; 1849 1850 /* set overflow flag */ 1851 replay->overflow++; 1852 1853 /* don't increment, no more packets accepted */ 1854 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1855 return 1; 1856 1857 IPSECLOG(LOG_WARNING, "replay counter made %d cycle. %s\n", 1858 replay->overflow, ipsec_logsastr(sav, buf, sizeof(buf))); 1859 } 1860 1861 replay->count++; 1862 1863 return 0; 1864 } 1865 1866 /* 1867 * shift variable length buffer to left. 1868 * IN: bitmap: pointer to the buffer 1869 * nbit: the number of to shift. 1870 * wsize: buffer size (bytes). 1871 */ 1872 static void 1873 vshiftl(unsigned char *bitmap, int nbit, int wsize) 1874 { 1875 int s, j, i; 1876 unsigned char over; 1877 1878 for (j = 0; j < nbit; j += 8) { 1879 s = (nbit - j < 8) ? (nbit - j): 8; 1880 bitmap[0] <<= s; 1881 for (i = 1; i < wsize; i++) { 1882 over = (bitmap[i] >> (8 - s)); 1883 bitmap[i] <<= s; 1884 bitmap[i-1] |= over; 1885 } 1886 } 1887 1888 return; 1889 } 1890 1891 /* Return a printable string for the address. */ 1892 const char * 1893 ipsec_address(const union sockaddr_union *sa, char *buf, size_t size) 1894 { 1895 switch (sa->sa.sa_family) { 1896 #if INET 1897 case AF_INET: 1898 in_print(buf, size, &sa->sin.sin_addr); 1899 return buf; 1900 #endif 1901 #if INET6 1902 case AF_INET6: 1903 in6_print(buf, size, &sa->sin6.sin6_addr); 1904 return buf; 1905 #endif 1906 default: 1907 return "(unknown address family)"; 1908 } 1909 } 1910 1911 const char * 1912 ipsec_logsastr(const struct secasvar *sav, char *buf, size_t size) 1913 { 1914 const struct secasindex *saidx = &sav->sah->saidx; 1915 char sbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN]; 1916 1917 KASSERTMSG(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1918 "af family mismatch, src %u, dst %u", 1919 saidx->src.sa.sa_family, saidx->dst.sa.sa_family); 1920 1921 snprintf(buf, size, "SA(SPI=%u src=%s dst=%s)", 1922 (u_int32_t)ntohl(sav->spi), 1923 ipsec_address(&saidx->src, sbuf, sizeof(sbuf)), 1924 ipsec_address(&saidx->dst, dbuf, sizeof(dbuf))); 1925 1926 return buf; 1927 } 1928 1929 void 1930 ipsec_dumpmbuf(struct mbuf *m) 1931 { 1932 int totlen; 1933 int i; 1934 u_char *p; 1935 1936 totlen = 0; 1937 printf("---\n"); 1938 while (m) { 1939 p = mtod(m, u_char *); 1940 for (i = 0; i < m->m_len; i++) { 1941 printf("%02x ", p[i]); 1942 totlen++; 1943 if (totlen % 16 == 0) 1944 printf("\n"); 1945 } 1946 m = m->m_next; 1947 } 1948 if (totlen % 16 != 0) 1949 printf("\n"); 1950 printf("---\n"); 1951 } 1952 1953 #ifdef INET6 1954 struct secpolicy * 1955 ipsec6_check_policy(struct mbuf *m, struct in6pcb *in6p, int flags, 1956 int *needipsecp, int *errorp) 1957 { 1958 struct secpolicy *sp = NULL; 1959 int s; 1960 int error = 0; 1961 int needipsec = 0; 1962 1963 if (!ipsec_outdone(m)) { 1964 s = splsoftnet(); 1965 if (in6p != NULL && 1966 ipsec_pcb_skip_ipsec(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { 1967 splx(s); 1968 goto skippolicycheck; 1969 } 1970 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, 1971 in6p); 1972 1973 /* 1974 * There are four return cases: 1975 * sp != NULL apply IPsec policy 1976 * sp == NULL, error == 0 no IPsec handling needed 1977 * sp == NULL, error == -EINVAL discard packet w/o error 1978 * sp == NULL, error != 0 discard packet, report error 1979 */ 1980 1981 splx(s); 1982 if (sp == NULL) { 1983 /* 1984 * Caller must check the error return to see if it needs to discard 1985 * the packet. 1986 */ 1987 needipsec = 0; 1988 } else { 1989 needipsec = 1; 1990 } 1991 } 1992 skippolicycheck:; 1993 1994 *errorp = error; 1995 *needipsecp = needipsec; 1996 return sp; 1997 } 1998 1999 int 2000 ipsec6_input(struct mbuf *m) 2001 { 2002 int s, error; 2003 2004 s = splsoftnet(); 2005 error = ipsec_in_reject(m, NULL); 2006 splx(s); 2007 if (error) { 2008 return EINVAL; 2009 } 2010 2011 return 0; 2012 } 2013 #endif /* INET6 */ 2014 2015 /* 2016 * ----------------------------------------------------------------------------- 2017 */ 2018 2019 /* XXX this stuff doesn't belong here... */ 2020 2021 static struct xformsw *xforms = NULL; 2022 2023 /* 2024 * Register a transform; typically at system startup. 2025 */ 2026 void 2027 xform_register(struct xformsw *xsp) 2028 { 2029 xsp->xf_next = xforms; 2030 xforms = xsp; 2031 } 2032 2033 /* 2034 * Initialize transform support in an sav. 2035 */ 2036 int 2037 xform_init(struct secasvar *sav, int xftype) 2038 { 2039 struct xformsw *xsp; 2040 2041 if (sav->tdb_xform != NULL) /* previously initialized */ 2042 return 0; 2043 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2044 if (xsp->xf_type == xftype) 2045 return (*xsp->xf_init)(sav, xsp); 2046 2047 IPSECLOG(LOG_DEBUG, "no match for xform type %d\n", xftype); 2048 return EINVAL; 2049 } 2050 2051 void 2052 nat_t_ports_get(struct mbuf *m, u_int16_t *dport, u_int16_t *sport) 2053 { 2054 struct m_tag *tag; 2055 2056 if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) { 2057 *sport = ((u_int16_t *)(tag + 1))[0]; 2058 *dport = ((u_int16_t *)(tag + 1))[1]; 2059 } else 2060 *sport = *dport = 0; 2061 } 2062 2063 /* 2064 * XXXJRT This should be done as a protosw init call. 2065 */ 2066 void 2067 ipsec_attach(void) 2068 { 2069 2070 ipsec_output_init(); 2071 2072 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); 2073 2074 sysctl_net_inet_ipsec_setup(NULL); 2075 #ifdef INET6 2076 sysctl_net_inet6_ipsec6_setup(NULL); 2077 #endif 2078 2079 ah_attach(); 2080 esp_attach(); 2081 ipcomp_attach(); 2082 ipe4_attach(); 2083 #ifdef TCP_SIGNATURE 2084 tcpsignature_attach(); 2085 #endif 2086 } 2087
Indexes created Tue Sep 30 11:09:46 GMT 2025