ipsec.c revision 1.149
1 /* $NetBSD: ipsec.c,v 1.149 2018/02/28 11:29:14 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 1.149 2018/02/28 11:29:14 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 ipsec_setspidx_inpcb(struct mbuf *, void *); 174 static int ipsec_setspidx(struct mbuf *, struct secpolicyindex *, int); 175 static void ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 176 static int ipsec4_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 177 #ifdef INET6 178 static void ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *, int); 179 static int ipsec6_setspidx_ipaddr(struct mbuf *, struct secpolicyindex *); 180 #endif 181 static void ipsec_delpcbpolicy(struct inpcbpolicy *); 182 #if 0 /* unused */ 183 static struct secpolicy *ipsec_deepcopy_policy(const struct secpolicy *); 184 #endif 185 static void ipsec_destroy_policy(struct secpolicy *); 186 static int ipsec_sp_reject(const struct secpolicy *, const struct mbuf *); 187 static void vshiftl(unsigned char *, int, int); 188 static size_t ipsec_sp_hdrsiz(const struct secpolicy *, const struct mbuf *); 189 190 /* 191 * Try to validate and use cached policy on a PCB. 192 */ 193 static struct secpolicy * 194 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 195 { 196 struct secpolicyindex spidx; 197 struct secpolicy *sp = NULL; 198 int s; 199 200 KASSERT(IPSEC_DIR_IS_VALID(dir)); 201 KASSERT(pcbsp != NULL); 202 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 203 KASSERT(inph_locked(pcbsp->sp_inph)); 204 205 /* 206 * Checking the generation and sp->state and taking a reference to an SP 207 * must be in a critical section of pserialize. See key_unlink_sp. 208 */ 209 s = pserialize_read_enter(); 210 /* SPD table change invalidate all the caches. */ 211 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 212 ipsec_invalpcbcache(pcbsp, dir); 213 goto out; 214 } 215 sp = pcbsp->sp_cache[dir].cachesp; 216 if (sp == NULL) 217 goto out; 218 if (sp->state != IPSEC_SPSTATE_ALIVE) { 219 sp = NULL; 220 ipsec_invalpcbcache(pcbsp, dir); 221 goto out; 222 } 223 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 224 /* NB: assume ipsec_setspidx never sleep */ 225 if (ipsec_setspidx(m, &spidx, 1) != 0) { 226 sp = NULL; 227 goto out; 228 } 229 230 /* 231 * We have to make an exact match here since the cached rule 232 * might have lower priority than a rule that would otherwise 233 * have matched the packet. 234 */ 235 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, 236 sizeof(spidx))) { 237 sp = NULL; 238 goto out; 239 } 240 } else { 241 /* 242 * The pcb is connected, and the L4 code is sure that: 243 * - outgoing side uses inp_[lf]addr 244 * - incoming side looks up policy after inpcb lookup 245 * and address pair is know to be stable. We do not need 246 * to generate spidx again, nor check the address match again. 247 * 248 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 249 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 250 */ 251 } 252 253 sp->lastused = time_second; 254 KEY_SP_REF(sp); 255 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 256 "DP cause refcnt++:%d SP:%p\n", 257 key_sp_refcnt(sp), pcbsp->sp_cache[dir].cachesp); 258 out: 259 pserialize_read_exit(s); 260 return sp; 261 } 262 263 static int 264 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 265 struct secpolicy *sp, int dir) 266 { 267 268 KASSERT(IPSEC_DIR_IS_INOROUT(dir)); 269 KASSERT(dir < __arraycount(pcbsp->sp_cache)); 270 KASSERT(inph_locked(pcbsp->sp_inph)); 271 272 pcbsp->sp_cache[dir].cachesp = NULL; 273 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_UNKNOWN; 274 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 275 return EINVAL; 276 } 277 pcbsp->sp_cache[dir].cachesp = sp; 278 if (pcbsp->sp_cache[dir].cachesp) { 279 /* 280 * If the PCB is connected, we can remember a hint to 281 * possibly short-circuit IPsec processing in other places. 282 */ 283 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 284 switch (pcbsp->sp_cache[dir].cachesp->policy) { 285 case IPSEC_POLICY_NONE: 286 case IPSEC_POLICY_BYPASS: 287 pcbsp->sp_cache[dir].cachehint = 288 IPSEC_PCBHINT_NO; 289 break; 290 default: 291 pcbsp->sp_cache[dir].cachehint = 292 IPSEC_PCBHINT_YES; 293 } 294 } 295 } 296 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 297 298 return 0; 299 } 300 301 static int 302 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 303 { 304 int i; 305 306 KASSERT(inph_locked(pcbsp->sp_inph)); 307 308 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 309 if (dir != IPSEC_DIR_ANY && i != dir) 310 continue; 311 pcbsp->sp_cache[i].cachesp = NULL; 312 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_UNKNOWN; 313 pcbsp->sp_cache[i].cachegen = 0; 314 memset(&pcbsp->sp_cache[i].cacheidx, 0, 315 sizeof(pcbsp->sp_cache[i].cacheidx)); 316 } 317 return 0; 318 } 319 320 void 321 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 322 { 323 324 KASSERT(inph_locked(pcbsp->sp_inph)); 325 326 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 327 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 328 } 329 330 void 331 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 332 { 333 334 KASSERT(inph_locked(pcbsp->sp_inph)); 335 336 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 337 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 338 } 339 340 void 341 ipsec_invalpcbcacheall(void) 342 { 343 344 if (ipsec_spdgen == UINT_MAX) 345 ipsec_spdgen = 1; 346 else 347 ipsec_spdgen++; 348 } 349 350 /* 351 * Return a held reference to the default SP. 352 */ 353 static struct secpolicy * 354 key_get_default_sp(int af, const char *where, int tag) 355 { 356 struct secpolicy *sp; 357 358 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP from %s:%u\n", where, tag); 359 360 switch(af) { 361 case AF_INET: 362 sp = &ip4_def_policy; 363 break; 364 #ifdef INET6 365 case AF_INET6: 366 sp = &ip6_def_policy; 367 break; 368 #endif 369 default: 370 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 371 "unexpected protocol family %u\n", af); 372 return NULL; 373 } 374 375 if (sp->policy != IPSEC_POLICY_DISCARD && 376 sp->policy != IPSEC_POLICY_NONE) { 377 IPSECLOG(LOG_INFO, "fixed system default policy: %d->%d\n", 378 sp->policy, IPSEC_POLICY_NONE); 379 sp->policy = IPSEC_POLICY_NONE; 380 } 381 KEY_SP_REF(sp); 382 383 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP returns SP:%p (%u)\n", 384 sp, key_sp_refcnt(sp)); 385 return sp; 386 } 387 388 #define KEY_GET_DEFAULT_SP(af) \ 389 key_get_default_sp((af), __func__, __LINE__) 390 391 /* 392 * For OUTBOUND packet having a socket. Searching SPD for packet, 393 * and return a pointer to SP. 394 * OUT: NULL: no apropreate SP found, the following value is set to error. 395 * 0 : bypass 396 * EACCES : discard packet. 397 * ENOENT : ipsec_acquire() in progress, maybe. 398 * others : error occurred. 399 * others: a pointer to SP 400 * 401 * NOTE: IPv6 mapped address concern is implemented here. 402 */ 403 static struct secpolicy * 404 ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb_hdr *inph, 405 int *error) 406 { 407 struct inpcbpolicy *pcbsp = NULL; 408 struct secpolicy *currsp = NULL; /* policy on socket */ 409 struct secpolicy *sp; 410 int af; 411 412 KASSERT(m != NULL); 413 KASSERT(inph != NULL); 414 KASSERT(error != NULL); 415 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 416 417 KASSERT(inph->inph_socket != NULL); 418 KASSERT(inph_locked(inph)); 419 420 /* XXX FIXME inpcb/in6pcb vs socket*/ 421 af = inph->inph_af; 422 KASSERTMSG(af == AF_INET || af == AF_INET6, 423 "unexpected protocol family %u", af); 424 425 KASSERT(inph->inph_sp != NULL); 426 /* If we have a cached entry, and if it is still valid, use it. */ 427 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); 428 currsp = ipsec_checkpcbcache(m, inph->inph_sp, dir); 429 if (currsp) { 430 *error = 0; 431 return currsp; 432 } 433 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); 434 435 switch (af) { 436 case AF_INET: { 437 struct inpcb *in4p = (struct inpcb *)inph; 438 /* set spidx in pcb */ 439 *error = ipsec_setspidx_inpcb(m, in4p); 440 pcbsp = in4p->inp_sp; 441 break; 442 } 443 #if defined(INET6) 444 case AF_INET6: { 445 struct in6pcb *in6p = (struct in6pcb *)inph; 446 /* set spidx in pcb */ 447 *error = ipsec_setspidx_inpcb(m, in6p); 448 pcbsp = in6p->in6p_sp; 449 break; 450 } 451 #endif 452 default: 453 *error = EPFNOSUPPORT; 454 break; 455 } 456 if (*error) 457 return NULL; 458 459 KASSERT(pcbsp != NULL); 460 switch (dir) { 461 case IPSEC_DIR_INBOUND: 462 currsp = pcbsp->sp_in; 463 break; 464 case IPSEC_DIR_OUTBOUND: 465 currsp = pcbsp->sp_out; 466 break; 467 } 468 KASSERT(currsp != NULL); 469 470 if (pcbsp->priv) { /* when privilieged socket */ 471 switch (currsp->policy) { 472 case IPSEC_POLICY_BYPASS: 473 case IPSEC_POLICY_IPSEC: 474 KEY_SP_REF(currsp); 475 sp = currsp; 476 break; 477 478 case IPSEC_POLICY_ENTRUST: 479 /* look for a policy in SPD */ 480 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 481 if (sp == NULL) /* no SP found */ 482 sp = KEY_GET_DEFAULT_SP(af); 483 break; 484 485 default: 486 IPSECLOG(LOG_ERR, "Invalid policy for PCB %d\n", 487 currsp->policy); 488 *error = EINVAL; 489 return NULL; 490 } 491 } else { /* unpriv, SPD has policy */ 492 sp = KEY_LOOKUP_SP_BYSPIDX(&currsp->spidx, dir); 493 if (sp == NULL) { /* no SP found */ 494 switch (currsp->policy) { 495 case IPSEC_POLICY_BYPASS: 496 IPSECLOG(LOG_ERR, "Illegal policy for " 497 "non-priviliged defined %d\n", 498 currsp->policy); 499 *error = EINVAL; 500 return NULL; 501 502 case IPSEC_POLICY_ENTRUST: 503 sp = KEY_GET_DEFAULT_SP(af); 504 break; 505 506 case IPSEC_POLICY_IPSEC: 507 KEY_SP_REF(currsp); 508 sp = currsp; 509 break; 510 511 default: 512 IPSECLOG(LOG_ERR, "Invalid policy for " 513 "PCB %d\n", currsp->policy); 514 *error = EINVAL; 515 return NULL; 516 } 517 } 518 } 519 KASSERTMSG(sp != NULL, "null SP (priv %u policy %u", pcbsp->priv, 520 currsp->policy); 521 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 522 "DP (priv %u policy %u) allocates SP:%p (refcnt %u)\n", 523 pcbsp->priv, currsp->policy, sp, key_sp_refcnt(sp)); 524 ipsec_fillpcbcache(pcbsp, m, sp, dir); 525 return sp; 526 } 527 528 /* 529 * For FORWARDING packet or OUTBOUND without a socket. Searching SPD for packet, 530 * and return a pointer to SP. 531 * OUT: positive: a pointer to the entry for security policy leaf matched. 532 * NULL: no apropreate SP found, the following value is set to error. 533 * 0 : bypass 534 * EACCES : discard packet. 535 * ENOENT : ipsec_acquire() in progress, maybe. 536 * others : error occurred. 537 */ 538 static struct secpolicy * 539 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 540 { 541 struct secpolicyindex spidx; 542 struct secpolicy *sp; 543 544 KASSERT(m != NULL); 545 KASSERT(error != NULL); 546 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 547 548 sp = NULL; 549 550 /* Make an index to look for a policy. */ 551 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 552 if (*error != 0) { 553 IPSECLOG(LOG_DEBUG, "setpidx failed, dir %u flag %u\n", dir, flag); 554 memset(&spidx, 0, sizeof(spidx)); 555 return NULL; 556 } 557 558 spidx.dir = dir; 559 560 if (key_havesp(dir)) { 561 sp = KEY_LOOKUP_SP_BYSPIDX(&spidx, dir); 562 } 563 564 if (sp == NULL) /* no SP found, use system default */ 565 sp = KEY_GET_DEFAULT_SP(spidx.dst.sa.sa_family); 566 KASSERT(sp != NULL); 567 return sp; 568 } 569 570 static struct secpolicy * 571 ipsec_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 572 void *inp) 573 { 574 struct secpolicy *sp; 575 576 *error = 0; 577 578 if (inp == NULL) { 579 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 580 } else { 581 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 582 KASSERT(inph->inph_socket != NULL); 583 sp = ipsec_getpolicybysock(m, dir, inph, error); 584 } 585 if (sp == NULL) { 586 KASSERTMSG(*error != 0, "getpolicy failed w/o error"); 587 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 588 return NULL; 589 } 590 KASSERTMSG(*error == 0, "sp w/ error set to %u", *error); 591 592 switch (sp->policy) { 593 case IPSEC_POLICY_ENTRUST: 594 default: 595 printf("%s: invalid policy %u\n", __func__, sp->policy); 596 /* fall thru... */ 597 case IPSEC_POLICY_DISCARD: 598 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 599 *error = -EINVAL; /* packet is discarded by caller */ 600 break; 601 case IPSEC_POLICY_BYPASS: 602 case IPSEC_POLICY_NONE: 603 KEY_SP_UNREF(&sp); 604 sp = NULL; /* NB: force NULL result */ 605 break; 606 case IPSEC_POLICY_IPSEC: 607 KASSERT(sp->req != NULL); 608 break; 609 } 610 611 if (*error != 0) { 612 KEY_SP_UNREF(&sp); 613 sp = NULL; 614 IPSECLOG(LOG_DEBUG, "done, error %d\n", *error); 615 } 616 617 return sp; 618 } 619 620 int 621 ipsec4_output(struct mbuf *m, struct inpcb *inp, int flags, 622 u_long *mtu, bool *natt_frag, bool *done) 623 { 624 struct secpolicy *sp = NULL; 625 int error, s; 626 627 /* 628 * Check the security policy (SP) for the packet and, if required, 629 * do IPsec-related processing. There are two cases here; the first 630 * time a packet is sent through it will be untagged and handled by 631 * ipsec_checkpolicy(). If the packet is resubmitted to ip_output 632 * (e.g. after AH, ESP, etc. processing), there will be a tag to 633 * bypass the lookup and related policy checking. 634 */ 635 if (ipsec_outdone(m)) { 636 return 0; 637 } 638 s = splsoftnet(); 639 if (inp && ipsec_pcb_skip_ipsec(inp->inp_sp, IPSEC_DIR_OUTBOUND)) { 640 splx(s); 641 return 0; 642 } 643 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, inp); 644 645 /* 646 * There are four return cases: 647 * sp != NULL apply IPsec policy 648 * sp == NULL, error == 0 no IPsec handling needed 649 * sp == NULL, error == -EINVAL discard packet w/o error 650 * sp == NULL, error != 0 discard packet, report error 651 */ 652 if (sp == NULL) { 653 splx(s); 654 if (error) { 655 /* 656 * Hack: -EINVAL is used to signal that a packet 657 * should be silently discarded. This is typically 658 * because we asked key management for an SA and 659 * it was delayed (e.g. kicked up to IKE). 660 */ 661 if (error == -EINVAL) 662 error = 0; 663 m_freem(m); 664 *done = true; 665 return error; 666 } 667 /* No IPsec processing for this packet. */ 668 return 0; 669 } 670 671 /* 672 * Do delayed checksums now because we send before 673 * this is done in the normal processing path. 674 */ 675 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 676 in_delayed_cksum(m); 677 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 678 } 679 680 { 681 u_long _mtu = 0; 682 683 error = ipsec4_process_packet(m, sp->req, &_mtu); 684 685 if (error == 0 && _mtu != 0) { 686 /* 687 * NAT-T ESP fragmentation: do not do IPSec processing 688 * now, we will do it on each fragmented packet. 689 */ 690 *mtu = _mtu; 691 *natt_frag = true; 692 KEY_SP_UNREF(&sp); 693 splx(s); 694 return 0; 695 } 696 } 697 698 /* 699 * Preserve KAME behaviour: ENOENT can be returned 700 * when an SA acquire is in progress. Don't propagate 701 * this to user-level; it confuses applications. 702 * 703 * XXX this will go away when the SADB is redone. 704 */ 705 if (error == ENOENT) 706 error = 0; 707 KEY_SP_UNREF(&sp); 708 splx(s); 709 *done = true; 710 return error; 711 } 712 713 int 714 ipsec4_input(struct mbuf *m, int flags) 715 { 716 struct secpolicy *sp; 717 int error, s; 718 719 s = splsoftnet(); 720 error = ipsec_in_reject(m, NULL); 721 splx(s); 722 if (error) { 723 return EINVAL; 724 } 725 726 if (flags == 0) { 727 /* We are done. */ 728 return 0; 729 } 730 731 /* 732 * Peek at the outbound SP for this packet to determine if 733 * it is a Fast Forward candidate. 734 */ 735 s = splsoftnet(); 736 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, NULL); 737 if (sp != NULL) { 738 m->m_flags &= ~M_CANFASTFWD; 739 KEY_SP_UNREF(&sp); 740 } 741 splx(s); 742 return 0; 743 } 744 745 int 746 ipsec4_forward(struct mbuf *m, int *destmtu) 747 { 748 /* 749 * If the packet is routed over IPsec tunnel, tell the 750 * originator the tunnel MTU. 751 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 752 * XXX quickhack!!! 753 */ 754 struct secpolicy *sp; 755 size_t ipsechdr; 756 int error; 757 758 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, IP_FORWARDING, 759 &error); 760 if (sp == NULL) { 761 return EINVAL; 762 } 763 764 /* Count IPsec header size. */ 765 ipsechdr = ipsec_sp_hdrsiz(sp, m); 766 767 /* 768 * Find the correct route for outer IPv4 header, compute tunnel MTU. 769 */ 770 if (sp->req) { 771 struct secasvar *sav; 772 773 sav = ipsec_lookup_sa(sp->req, m); 774 if (sav != NULL) { 775 struct route *ro; 776 struct rtentry *rt; 777 778 ro = &sav->sah->sa_route; 779 rt = rtcache_validate(ro); 780 if (rt && rt->rt_ifp) { 781 *destmtu = rt->rt_rmx.rmx_mtu ? 782 rt->rt_rmx.rmx_mtu : rt->rt_ifp->if_mtu; 783 *destmtu -= ipsechdr; 784 } 785 rtcache_unref(rt, ro); 786 KEY_SA_UNREF(&sav); 787 } 788 } 789 KEY_SP_UNREF(&sp); 790 return 0; 791 } 792 793 static int 794 ipsec_setspidx_inpcb(struct mbuf *m, void *pcb) 795 { 796 struct inpcb_hdr *inph = (struct inpcb_hdr *)pcb; 797 int error; 798 799 KASSERT(inph != NULL); 800 KASSERT(inph->inph_sp != NULL); 801 KASSERT(inph->inph_sp->sp_out != NULL); 802 KASSERT(inph->inph_sp->sp_in != NULL); 803 804 error = ipsec_setspidx(m, &inph->inph_sp->sp_in->spidx, 1); 805 if (error == 0) { 806 inph->inph_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 807 inph->inph_sp->sp_out->spidx = inph->inph_sp->sp_in->spidx; 808 inph->inph_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 809 } else { 810 memset(&inph->inph_sp->sp_in->spidx, 0, 811 sizeof(inph->inph_sp->sp_in->spidx)); 812 memset(&inph->inph_sp->sp_out->spidx, 0, 813 sizeof(inph->inph_sp->sp_out->spidx)); 814 } 815 return error; 816 } 817 818 /* 819 * configure security policy index (src/dst/proto/sport/dport) 820 * by looking at the content of mbuf. 821 * the caller is responsible for error recovery (like clearing up spidx). 822 */ 823 static int 824 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 825 { 826 struct ip *ip = NULL; 827 struct ip ipbuf; 828 u_int v; 829 struct mbuf *n; 830 int len; 831 int error; 832 833 KASSERT(m != NULL); 834 835 /* 836 * validate m->m_pkthdr.len. we see incorrect length if we 837 * mistakenly call this function with inconsistent mbuf chain 838 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 839 */ 840 len = 0; 841 for (n = m; n; n = n->m_next) 842 len += n->m_len; 843 if (m->m_pkthdr.len != len) { 844 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 845 "total of m_len(%d) != pkthdr.len(%d), ignored.\n", 846 len, m->m_pkthdr.len); 847 KASSERTMSG(0, "impossible"); 848 return EINVAL; 849 } 850 851 if (m->m_pkthdr.len < sizeof(struct ip)) { 852 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 853 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 854 m->m_pkthdr.len); 855 return EINVAL; 856 } 857 858 if (m->m_len >= sizeof(*ip)) { 859 ip = mtod(m, struct ip *); 860 } else { 861 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 862 ip = &ipbuf; 863 } 864 v = ip->ip_v; 865 switch (v) { 866 case 4: 867 error = ipsec4_setspidx_ipaddr(m, spidx); 868 if (error) 869 return error; 870 ipsec4_get_ulp(m, spidx, needport); 871 return 0; 872 #ifdef INET6 873 case 6: 874 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 875 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 876 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 877 "ignored.\n", m->m_pkthdr.len); 878 return EINVAL; 879 } 880 error = ipsec6_setspidx_ipaddr(m, spidx); 881 if (error) 882 return error; 883 ipsec6_get_ulp(m, spidx, needport); 884 return 0; 885 #endif 886 default: 887 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 888 "unknown IP version %u, ignored.\n", v); 889 return EINVAL; 890 } 891 } 892 893 static void 894 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 895 { 896 u_int8_t nxt; 897 int off; 898 899 KASSERT(m != NULL); 900 KASSERTMSG(m->m_pkthdr.len >= sizeof(struct ip), "packet too short"); 901 902 /* NB: ip_input() flips it into host endian XXX need more checking */ 903 if (m->m_len >= sizeof(struct ip)) { 904 struct ip *ip = mtod(m, struct ip *); 905 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) 906 goto done; 907 off = ip->ip_hl << 2; 908 nxt = ip->ip_p; 909 } else { 910 struct ip ih; 911 912 m_copydata(m, 0, sizeof(struct ip), &ih); 913 if (ih.ip_off & htons(IP_MF | IP_OFFMASK)) 914 goto done; 915 off = ih.ip_hl << 2; 916 nxt = ih.ip_p; 917 } 918 919 while (off < m->m_pkthdr.len) { 920 struct ip6_ext ip6e; 921 struct tcphdr th; 922 struct udphdr uh; 923 struct icmp icmph; 924 925 switch (nxt) { 926 case IPPROTO_TCP: 927 spidx->ul_proto = nxt; 928 if (!needport) 929 goto done_proto; 930 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 931 goto done; 932 m_copydata(m, off, sizeof(th), &th); 933 spidx->src.sin.sin_port = th.th_sport; 934 spidx->dst.sin.sin_port = th.th_dport; 935 return; 936 case IPPROTO_UDP: 937 spidx->ul_proto = nxt; 938 if (!needport) 939 goto done_proto; 940 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 941 goto done; 942 m_copydata(m, off, sizeof(uh), &uh); 943 spidx->src.sin.sin_port = uh.uh_sport; 944 spidx->dst.sin.sin_port = uh.uh_dport; 945 return; 946 case IPPROTO_AH: 947 if (off + sizeof(ip6e) > m->m_pkthdr.len) 948 goto done; 949 /* XXX sigh, this works but is totally bogus */ 950 m_copydata(m, off, sizeof(ip6e), &ip6e); 951 off += (ip6e.ip6e_len + 2) << 2; 952 nxt = ip6e.ip6e_nxt; 953 break; 954 case IPPROTO_ICMP: 955 spidx->ul_proto = nxt; 956 if (off + sizeof(struct icmp) > m->m_pkthdr.len) 957 goto done; 958 m_copydata(m, off, sizeof(icmph), &icmph); 959 ((struct sockaddr_in *)&spidx->src)->sin_port = 960 htons((uint16_t)icmph.icmp_type); 961 ((struct sockaddr_in *)&spidx->dst)->sin_port = 962 htons((uint16_t)icmph.icmp_code); 963 return; 964 default: 965 /* XXX intermediate headers??? */ 966 spidx->ul_proto = nxt; 967 goto done_proto; 968 } 969 } 970 done: 971 spidx->ul_proto = IPSEC_ULPROTO_ANY; 972 done_proto: 973 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 974 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 975 } 976 977 static int 978 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 979 { 980 static const struct sockaddr_in template = { 981 sizeof(struct sockaddr_in), 982 AF_INET, 983 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 984 }; 985 986 spidx->src.sin = template; 987 spidx->dst.sin = template; 988 989 if (m->m_len < sizeof(struct ip)) { 990 m_copydata(m, offsetof(struct ip, ip_src), 991 sizeof(struct in_addr), &spidx->src.sin.sin_addr); 992 m_copydata(m, offsetof(struct ip, ip_dst), 993 sizeof(struct in_addr), &spidx->dst.sin.sin_addr); 994 } else { 995 struct ip *ip = mtod(m, struct ip *); 996 spidx->src.sin.sin_addr = ip->ip_src; 997 spidx->dst.sin.sin_addr = ip->ip_dst; 998 } 999 1000 spidx->prefs = sizeof(struct in_addr) << 3; 1001 spidx->prefd = sizeof(struct in_addr) << 3; 1002 1003 return 0; 1004 } 1005 1006 #ifdef INET6 1007 static void 1008 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 1009 { 1010 int off, nxt; 1011 struct tcphdr th; 1012 struct udphdr uh; 1013 struct icmp6_hdr icmph; 1014 1015 KASSERT(m != NULL); 1016 1017 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1018 kdebug_mbuf(__func__, m); 1019 } 1020 1021 /* set default */ 1022 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1023 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1024 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1025 1026 nxt = -1; 1027 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1028 if (off < 0 || m->m_pkthdr.len < off) 1029 return; 1030 1031 switch (nxt) { 1032 case IPPROTO_TCP: 1033 spidx->ul_proto = nxt; 1034 if (!needport) 1035 break; 1036 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1037 break; 1038 m_copydata(m, off, sizeof(th), &th); 1039 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1040 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1041 break; 1042 case IPPROTO_UDP: 1043 spidx->ul_proto = nxt; 1044 if (!needport) 1045 break; 1046 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1047 break; 1048 m_copydata(m, off, sizeof(uh), &uh); 1049 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1050 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1051 break; 1052 case IPPROTO_ICMPV6: 1053 spidx->ul_proto = nxt; 1054 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 1055 break; 1056 m_copydata(m, off, sizeof(icmph), &icmph); 1057 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 1058 htons((uint16_t)icmph.icmp6_type); 1059 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 1060 htons((uint16_t)icmph.icmp6_code); 1061 break; 1062 default: 1063 /* XXX intermediate headers??? */ 1064 spidx->ul_proto = nxt; 1065 break; 1066 } 1067 } 1068 1069 static int 1070 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1071 { 1072 struct ip6_hdr *ip6 = NULL; 1073 struct ip6_hdr ip6buf; 1074 struct sockaddr_in6 *sin6; 1075 1076 if (m->m_len >= sizeof(*ip6)) 1077 ip6 = mtod(m, struct ip6_hdr *); 1078 else { 1079 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1080 ip6 = &ip6buf; 1081 } 1082 1083 sin6 = (struct sockaddr_in6 *)&spidx->src; 1084 memset(sin6, 0, sizeof(*sin6)); 1085 sin6->sin6_family = AF_INET6; 1086 sin6->sin6_len = sizeof(struct sockaddr_in6); 1087 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); 1088 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1089 sin6->sin6_addr.s6_addr16[1] = 0; 1090 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1091 } 1092 spidx->prefs = sizeof(struct in6_addr) << 3; 1093 1094 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1095 memset(sin6, 0, sizeof(*sin6)); 1096 sin6->sin6_family = AF_INET6; 1097 sin6->sin6_len = sizeof(struct sockaddr_in6); 1098 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); 1099 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1100 sin6->sin6_addr.s6_addr16[1] = 0; 1101 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1102 } 1103 spidx->prefd = sizeof(struct in6_addr) << 3; 1104 1105 return 0; 1106 } 1107 #endif 1108 1109 static void 1110 ipsec_delpcbpolicy(struct inpcbpolicy *p) 1111 { 1112 1113 kmem_intr_free(p, sizeof(*p)); 1114 } 1115 1116 /* initialize policy in PCB */ 1117 int 1118 ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) 1119 { 1120 struct inpcbpolicy *new; 1121 1122 KASSERT(so != NULL); 1123 KASSERT(policy != NULL); 1124 1125 new = kmem_intr_zalloc(sizeof(*new), KM_NOSLEEP); 1126 if (new == NULL) { 1127 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1128 return ENOBUFS; 1129 } 1130 1131 if (IPSEC_PRIVILEGED_SO(so)) 1132 new->priv = 1; 1133 else 1134 new->priv = 0; 1135 1136 /* 1137 * Set dummy SPs. Actual SPs will be allocated later if needed. 1138 */ 1139 new->sp_in = &ipsec_dummy_sp; 1140 new->sp_out = &ipsec_dummy_sp; 1141 1142 *policy = new; 1143 1144 return 0; 1145 } 1146 1147 #if 0 /* unused */ 1148 /* copy old ipsec policy into new */ 1149 int 1150 ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) 1151 { 1152 struct secpolicy *sp; 1153 1154 sp = ipsec_deepcopy_policy(old->sp_in); 1155 if (sp) { 1156 KEY_SP_UNREF(&new->sp_in); 1157 new->sp_in = sp; 1158 } else 1159 return ENOBUFS; 1160 1161 sp = ipsec_deepcopy_policy(old->sp_out); 1162 if (sp) { 1163 KEY_SP_UNREF(&new->sp_out); 1164 new->sp_out = sp; 1165 } else 1166 return ENOBUFS; 1167 1168 new->priv = old->priv; 1169 1170 return 0; 1171 } 1172 1173 /* deep-copy a policy in PCB */ 1174 static struct secpolicy * 1175 ipsec_deepcopy_policy(const struct secpolicy *src) 1176 { 1177 struct ipsecrequest *newchain = NULL; 1178 const struct ipsecrequest *p; 1179 struct ipsecrequest **q; 1180 struct secpolicy *dst; 1181 1182 if (src == NULL) 1183 return NULL; 1184 dst = KEY_NEWSP(); 1185 if (dst == NULL) 1186 return NULL; 1187 1188 /* 1189 * deep-copy IPsec request chain. This is required since struct 1190 * ipsecrequest is not reference counted. 1191 */ 1192 q = &newchain; 1193 for (p = src->req; p; p = p->next) { 1194 *q = kmem_zalloc(sizeof(**q), KM_SLEEP); 1195 (*q)->next = NULL; 1196 1197 (*q)->saidx.proto = p->saidx.proto; 1198 (*q)->saidx.mode = p->saidx.mode; 1199 (*q)->level = p->level; 1200 (*q)->saidx.reqid = p->saidx.reqid; 1201 1202 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); 1203 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); 1204 1205 (*q)->sp = dst; 1206 1207 q = &((*q)->next); 1208 } 1209 1210 dst->req = newchain; 1211 dst->state = src->state; 1212 dst->policy = src->policy; 1213 /* do not touch the refcnt fields */ 1214 1215 return dst; 1216 } 1217 #endif 1218 1219 static void 1220 ipsec_destroy_policy(struct secpolicy *sp) 1221 { 1222 1223 if (sp == &ipsec_dummy_sp) 1224 ; /* It's dummy. No need to free it. */ 1225 else { 1226 /* 1227 * We cannot destroy here because it can be called in 1228 * softint. So mark the SP as DEAD and let the timer 1229 * destroy it. See key_timehandler_spd. 1230 */ 1231 sp->state = IPSEC_SPSTATE_DEAD; 1232 } 1233 } 1234 1235 int 1236 ipsec_set_policy(void *inp, int optname, const void *request, size_t len, 1237 kauth_cred_t cred) 1238 { 1239 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1240 const struct sadb_x_policy *xpl; 1241 struct secpolicy *newsp, *oldsp; 1242 struct secpolicy **policy; 1243 int error; 1244 1245 KASSERT(!cpu_softintr_p()); 1246 KASSERT(inph != NULL); 1247 KASSERT(inph_locked(inph)); 1248 KASSERT(request != NULL); 1249 1250 if (len < sizeof(*xpl)) 1251 return EINVAL; 1252 xpl = (const struct sadb_x_policy *)request; 1253 1254 KASSERT(inph->inph_sp != NULL); 1255 1256 /* select direction */ 1257 switch (xpl->sadb_x_policy_dir) { 1258 case IPSEC_DIR_INBOUND: 1259 policy = &inph->inph_sp->sp_in; 1260 break; 1261 case IPSEC_DIR_OUTBOUND: 1262 policy = &inph->inph_sp->sp_out; 1263 break; 1264 default: 1265 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1266 xpl->sadb_x_policy_dir); 1267 return EINVAL; 1268 } 1269 1270 /* sanity check. */ 1271 if (policy == NULL || *policy == NULL) 1272 return EINVAL; 1273 1274 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1275 kdebug_sadb_xpolicy("set passed policy", request); 1276 } 1277 1278 /* check policy type */ 1279 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1280 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD || 1281 xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1282 return EINVAL; 1283 1284 /* check privileged socket */ 1285 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1286 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, 1287 KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); 1288 if (error) 1289 return error; 1290 } 1291 1292 /* allocation new SP entry */ 1293 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1294 return error; 1295 1296 key_init_sp(newsp); 1297 newsp->created = time_uptime; 1298 /* Insert the global list for SPs for sockets */ 1299 key_socksplist_add(newsp); 1300 1301 /* clear old SP and set new SP */ 1302 oldsp = *policy; 1303 *policy = newsp; 1304 ipsec_destroy_policy(oldsp); 1305 1306 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1307 printf("%s: new policy\n", __func__); 1308 kdebug_secpolicy(newsp); 1309 } 1310 1311 return 0; 1312 } 1313 1314 int 1315 ipsec_get_policy(void *inp, const void *request, size_t len, 1316 struct mbuf **mp) 1317 { 1318 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1319 const struct sadb_x_policy *xpl; 1320 struct secpolicy *policy; 1321 1322 /* sanity check. */ 1323 if (inph == NULL || request == NULL || mp == NULL) 1324 return EINVAL; 1325 KASSERT(inph->inph_sp != NULL); 1326 if (len < sizeof(*xpl)) 1327 return EINVAL; 1328 xpl = (const struct sadb_x_policy *)request; 1329 1330 /* select direction */ 1331 switch (xpl->sadb_x_policy_dir) { 1332 case IPSEC_DIR_INBOUND: 1333 policy = inph->inph_sp->sp_in; 1334 break; 1335 case IPSEC_DIR_OUTBOUND: 1336 policy = inph->inph_sp->sp_out; 1337 break; 1338 default: 1339 IPSECLOG(LOG_ERR, "invalid direction=%u\n", 1340 xpl->sadb_x_policy_dir); 1341 return EINVAL; 1342 } 1343 1344 if (policy == NULL) 1345 return EINVAL; 1346 1347 *mp = key_sp2msg(policy, M_NOWAIT); 1348 if (!*mp) { 1349 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 1350 return ENOBUFS; 1351 } 1352 1353 (*mp)->m_type = MT_DATA; 1354 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DUMP)) { 1355 kdebug_mbuf(__func__, *mp); 1356 } 1357 1358 return 0; 1359 } 1360 1361 int 1362 ipsec_delete_pcbpolicy(void *inp) 1363 { 1364 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1365 1366 KASSERT(inph != NULL); 1367 1368 if (inph->inph_sp == NULL) 1369 return 0; 1370 1371 if (inph->inph_sp->sp_in != NULL) 1372 ipsec_destroy_policy(inph->inph_sp->sp_in); 1373 1374 if (inph->inph_sp->sp_out != NULL) 1375 ipsec_destroy_policy(inph->inph_sp->sp_out); 1376 1377 ipsec_invalpcbcache(inph->inph_sp, IPSEC_DIR_ANY); 1378 1379 ipsec_delpcbpolicy(inph->inph_sp); 1380 inph->inph_sp = NULL; 1381 1382 return 0; 1383 } 1384 1385 /* 1386 * Return the current level (either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE). 1387 */ 1388 u_int 1389 ipsec_get_reqlevel(const struct ipsecrequest *isr) 1390 { 1391 u_int level = 0; 1392 u_int esp_trans_deflev, esp_net_deflev; 1393 u_int ah_trans_deflev, ah_net_deflev; 1394 1395 KASSERT(isr != NULL); 1396 KASSERT(isr->sp != NULL); 1397 KASSERTMSG( 1398 isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1399 "af family mismatch, src %u, dst %u", 1400 isr->sp->spidx.src.sa.sa_family, isr->sp->spidx.dst.sa.sa_family); 1401 1402 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1403 #define IPSEC_CHECK_DEFAULT(lev) \ 1404 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1405 && (lev) != IPSEC_LEVEL_UNIQUE) ? \ 1406 (ipsec_debug ? log(LOG_INFO, "fixed system default level " #lev \ 1407 ":%d->%d\n", (lev), IPSEC_LEVEL_REQUIRE) : (void)0), \ 1408 (lev) = IPSEC_LEVEL_REQUIRE, (lev) \ 1409 : (lev)) 1410 1411 /* set default level */ 1412 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1413 #ifdef INET 1414 case AF_INET: 1415 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1416 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1417 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1418 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1419 break; 1420 #endif 1421 #ifdef INET6 1422 case AF_INET6: 1423 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1424 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1425 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1426 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1427 break; 1428 #endif /* INET6 */ 1429 default: 1430 panic("%s: unknown af %u", __func__, 1431 isr->sp->spidx.src.sa.sa_family); 1432 } 1433 1434 #undef IPSEC_CHECK_DEFAULT 1435 1436 /* set level */ 1437 switch (isr->level) { 1438 case IPSEC_LEVEL_DEFAULT: 1439 switch (isr->saidx.proto) { 1440 case IPPROTO_ESP: 1441 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1442 level = esp_net_deflev; 1443 else 1444 level = esp_trans_deflev; 1445 break; 1446 case IPPROTO_AH: 1447 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1448 level = ah_net_deflev; 1449 else 1450 level = ah_trans_deflev; 1451 break; 1452 case IPPROTO_IPCOMP: 1453 /* 1454 * we don't really care, as IPcomp document says that 1455 * we shouldn't compress small packets 1456 */ 1457 level = IPSEC_LEVEL_USE; 1458 break; 1459 default: 1460 panic("%s: Illegal protocol defined %u", __func__, 1461 isr->saidx.proto); 1462 } 1463 break; 1464 1465 case IPSEC_LEVEL_USE: 1466 case IPSEC_LEVEL_REQUIRE: 1467 level = isr->level; 1468 break; 1469 case IPSEC_LEVEL_UNIQUE: 1470 level = IPSEC_LEVEL_REQUIRE; 1471 break; 1472 1473 default: 1474 panic("%s: Illegal IPsec level %u", __func__, isr->level); 1475 } 1476 1477 return level; 1478 } 1479 1480 /* 1481 * Check security policy requirements against the actual packet contents. 1482 * 1483 * If the SP requires an IPsec packet, and the packet was neither AH nor ESP, 1484 * then kick it. 1485 */ 1486 static int 1487 ipsec_sp_reject(const struct secpolicy *sp, const struct mbuf *m) 1488 { 1489 struct ipsecrequest *isr; 1490 1491 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1492 printf("%s: using SP\n", __func__); 1493 kdebug_secpolicy(sp); 1494 } 1495 1496 /* check policy */ 1497 switch (sp->policy) { 1498 case IPSEC_POLICY_DISCARD: 1499 return 1; 1500 case IPSEC_POLICY_BYPASS: 1501 case IPSEC_POLICY_NONE: 1502 return 0; 1503 } 1504 1505 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1506 "invalid policy %u", sp->policy); 1507 1508 /* XXX should compare policy against ipsec header history */ 1509 1510 for (isr = sp->req; isr != NULL; isr = isr->next) { 1511 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1512 continue; 1513 switch (isr->saidx.proto) { 1514 case IPPROTO_ESP: 1515 if ((m->m_flags & M_DECRYPTED) == 0) { 1516 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1517 "ESP m_flags:%x\n", m->m_flags); 1518 return 1; 1519 } 1520 break; 1521 case IPPROTO_AH: 1522 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1523 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DUMP, 1524 "AH m_flags:%x\n", m->m_flags); 1525 return 1; 1526 } 1527 break; 1528 case IPPROTO_IPCOMP: 1529 /* 1530 * We don't really care, as IPcomp document 1531 * says that we shouldn't compress small 1532 * packets, IPComp policy should always be 1533 * treated as being in "use" level. 1534 */ 1535 break; 1536 } 1537 } 1538 1539 return 0; 1540 } 1541 1542 /* 1543 * Check security policy requirements. 1544 */ 1545 int 1546 ipsec_in_reject(struct mbuf *m, void *inp) 1547 { 1548 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1549 struct secpolicy *sp; 1550 int error; 1551 int result; 1552 1553 KASSERT(m != NULL); 1554 1555 if (inph == NULL) 1556 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 1557 IP_FORWARDING, &error); 1558 else 1559 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1560 inph, &error); 1561 1562 if (sp != NULL) { 1563 result = ipsec_sp_reject(sp, m); 1564 if (result) 1565 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1566 KEY_SP_UNREF(&sp); 1567 } else { 1568 result = 0; 1569 } 1570 return result; 1571 } 1572 1573 /* 1574 * Compute the byte size to be occupied by the IPsec header. If it is 1575 * tunneled, it includes the size of outer IP header. 1576 */ 1577 static size_t 1578 ipsec_sp_hdrsiz(const struct secpolicy *sp, const struct mbuf *m) 1579 { 1580 struct ipsecrequest *isr; 1581 size_t siz; 1582 1583 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 1584 printf("%s: using SP\n", __func__); 1585 kdebug_secpolicy(sp); 1586 } 1587 1588 switch (sp->policy) { 1589 case IPSEC_POLICY_DISCARD: 1590 case IPSEC_POLICY_BYPASS: 1591 case IPSEC_POLICY_NONE: 1592 return 0; 1593 } 1594 1595 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 1596 "invalid policy %u", sp->policy); 1597 1598 siz = 0; 1599 for (isr = sp->req; isr != NULL; isr = isr->next) { 1600 size_t clen = 0; 1601 struct secasvar *sav; 1602 1603 switch (isr->saidx.proto) { 1604 case IPPROTO_ESP: 1605 sav = ipsec_lookup_sa(isr, m); 1606 if (sav != NULL) { 1607 clen = esp_hdrsiz(sav); 1608 KEY_SA_UNREF(&sav); 1609 } else 1610 clen = esp_hdrsiz(NULL); 1611 break; 1612 case IPPROTO_AH: 1613 sav = ipsec_lookup_sa(isr, m); 1614 if (sav != NULL) { 1615 clen = ah_hdrsiz(sav); 1616 KEY_SA_UNREF(&sav); 1617 } else 1618 clen = ah_hdrsiz(NULL); 1619 break; 1620 case IPPROTO_IPCOMP: 1621 clen = sizeof(struct ipcomp); 1622 break; 1623 } 1624 1625 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1626 switch (isr->saidx.dst.sa.sa_family) { 1627 case AF_INET: 1628 clen += sizeof(struct ip); 1629 break; 1630 #ifdef INET6 1631 case AF_INET6: 1632 clen += sizeof(struct ip6_hdr); 1633 break; 1634 #endif 1635 default: 1636 IPSECLOG(LOG_ERR, "unknown AF %d in " 1637 "IPsec tunnel SA\n", 1638 ((const struct sockaddr *)&isr->saidx.dst) 1639 ->sa_family); 1640 break; 1641 } 1642 } 1643 siz += clen; 1644 } 1645 1646 return siz; 1647 } 1648 1649 size_t 1650 ipsec_hdrsiz(struct mbuf *m, u_int dir, void *inp) 1651 { 1652 struct inpcb_hdr *inph = (struct inpcb_hdr *)inp; 1653 struct secpolicy *sp; 1654 int error; 1655 size_t size; 1656 1657 KASSERT(m != NULL); 1658 KASSERTMSG(inph == NULL || inph->inph_socket != NULL, 1659 "socket w/o inpcb"); 1660 1661 if (inph == NULL) 1662 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1663 else 1664 sp = ipsec_getpolicybysock(m, dir, inph, &error); 1665 1666 if (sp != NULL) { 1667 size = ipsec_sp_hdrsiz(sp, m); 1668 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_DATA, "size:%zu.\n", size); 1669 KEY_SP_UNREF(&sp); 1670 } else { 1671 size = 0; 1672 } 1673 1674 return size; 1675 } 1676 1677 /* 1678 * Check the variable replay window. 1679 * ipsec_chkreplay() performs replay check before ICV verification. 1680 * ipsec_updatereplay() updates replay bitmap. This must be called after 1681 * ICV verification (it also performs replay check, which is usually done 1682 * beforehand). 1683 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1684 * 1685 * based on RFC 2401. 1686 */ 1687 int 1688 ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) 1689 { 1690 const struct secreplay *replay; 1691 u_int32_t diff; 1692 int fr; 1693 u_int32_t wsizeb; /* constant: bits of window size */ 1694 int frlast; /* constant: last frame */ 1695 1696 IPSEC_SPLASSERT_SOFTNET(__func__); 1697 1698 KASSERT(sav != NULL); 1699 KASSERT(sav->replay != NULL); 1700 1701 replay = sav->replay; 1702 1703 if (replay->wsize == 0) 1704 return 1; /* no need to check replay. */ 1705 1706 /* constant */ 1707 frlast = replay->wsize - 1; 1708 wsizeb = replay->wsize << 3; 1709 1710 /* sequence number of 0 is invalid */ 1711 if (seq == 0) 1712 return 0; 1713 1714 /* first time is always okay */ 1715 if (replay->count == 0) 1716 return 1; 1717 1718 if (seq > replay->lastseq) { 1719 /* larger sequences are okay */ 1720 return 1; 1721 } else { 1722 /* seq is equal or less than lastseq. */ 1723 diff = replay->lastseq - seq; 1724 1725 /* over range to check, i.e. too old or wrapped */ 1726 if (diff >= wsizeb) 1727 return 0; 1728 1729 fr = frlast - diff / 8; 1730 1731 /* this packet already seen ? */ 1732 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1733 return 0; 1734 1735 /* out of order but good */ 1736 return 1; 1737 } 1738 } 1739 1740 /* 1741 * check replay counter whether to update or not. 1742 * OUT: 0: OK 1743 * 1: NG 1744 */ 1745 int 1746 ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) 1747 { 1748 struct secreplay *replay; 1749 u_int32_t diff; 1750 int fr; 1751 u_int32_t wsizeb; /* constant: bits of window size */ 1752 int frlast; /* constant: last frame */ 1753 1754 IPSEC_SPLASSERT_SOFTNET(__func__); 1755 1756 KASSERT(sav != NULL); 1757 KASSERT(sav->replay != NULL); 1758 1759 replay = sav->replay; 1760 1761 if (replay->wsize == 0) 1762 goto ok; /* no need to check replay. */ 1763 1764 /* constant */ 1765 frlast = replay->wsize - 1; 1766 wsizeb = replay->wsize << 3; 1767 1768 /* sequence number of 0 is invalid */ 1769 if (seq == 0) 1770 return 1; 1771 1772 /* first time */ 1773 if (replay->count == 0) { 1774 replay->lastseq = seq; 1775 memset(replay->bitmap, 0, replay->wsize); 1776 (replay->bitmap)[frlast] = 1; 1777 goto ok; 1778 } 1779 1780 if (seq > replay->lastseq) { 1781 /* seq is larger than lastseq. */ 1782 diff = seq - replay->lastseq; 1783 1784 /* new larger sequence number */ 1785 if (diff < wsizeb) { 1786 /* In window */ 1787 /* set bit for this packet */ 1788 vshiftl(replay->bitmap, diff, replay->wsize); 1789 (replay->bitmap)[frlast] |= 1; 1790 } else { 1791 /* this packet has a "way larger" */ 1792 memset(replay->bitmap, 0, replay->wsize); 1793 (replay->bitmap)[frlast] = 1; 1794 } 1795 replay->lastseq = seq; 1796 1797 /* larger is good */ 1798 } else { 1799 /* seq is equal or less than lastseq. */ 1800 diff = replay->lastseq - seq; 1801 1802 /* over range to check, i.e. too old or wrapped */ 1803 if (diff >= wsizeb) 1804 return 1; 1805 1806 fr = frlast - diff / 8; 1807 1808 /* this packet already seen ? */ 1809 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1810 return 1; 1811 1812 /* mark as seen */ 1813 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1814 1815 /* out of order but good */ 1816 } 1817 1818 ok: 1819 if (replay->count == ~0) { 1820 char buf[IPSEC_LOGSASTRLEN]; 1821 1822 /* set overflow flag */ 1823 replay->overflow++; 1824 1825 /* don't increment, no more packets accepted */ 1826 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1827 return 1; 1828 1829 IPSECLOG(LOG_WARNING, "replay counter made %d cycle. %s\n", 1830 replay->overflow, ipsec_logsastr(sav, buf, sizeof(buf))); 1831 } 1832 1833 replay->count++; 1834 1835 return 0; 1836 } 1837 1838 /* 1839 * shift variable length buffer to left. 1840 * IN: bitmap: pointer to the buffer 1841 * nbit: the number of to shift. 1842 * wsize: buffer size (bytes). 1843 */ 1844 static void 1845 vshiftl(unsigned char *bitmap, int nbit, int wsize) 1846 { 1847 int s, j, i; 1848 unsigned char over; 1849 1850 for (j = 0; j < nbit; j += 8) { 1851 s = (nbit - j < 8) ? (nbit - j): 8; 1852 bitmap[0] <<= s; 1853 for (i = 1; i < wsize; i++) { 1854 over = (bitmap[i] >> (8 - s)); 1855 bitmap[i] <<= s; 1856 bitmap[i-1] |= over; 1857 } 1858 } 1859 1860 return; 1861 } 1862 1863 /* Return a printable string for the address. */ 1864 const char * 1865 ipsec_address(const union sockaddr_union *sa, char *buf, size_t size) 1866 { 1867 switch (sa->sa.sa_family) { 1868 #if INET 1869 case AF_INET: 1870 in_print(buf, size, &sa->sin.sin_addr); 1871 return buf; 1872 #endif 1873 #if INET6 1874 case AF_INET6: 1875 in6_print(buf, size, &sa->sin6.sin6_addr); 1876 return buf; 1877 #endif 1878 default: 1879 return "(unknown address family)"; 1880 } 1881 } 1882 1883 const char * 1884 ipsec_logsastr(const struct secasvar *sav, char *buf, size_t size) 1885 { 1886 const struct secasindex *saidx = &sav->sah->saidx; 1887 char sbuf[IPSEC_ADDRSTRLEN], dbuf[IPSEC_ADDRSTRLEN]; 1888 1889 KASSERTMSG(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1890 "af family mismatch, src %u, dst %u", 1891 saidx->src.sa.sa_family, saidx->dst.sa.sa_family); 1892 1893 snprintf(buf, size, "SA(SPI=%u src=%s dst=%s)", 1894 (u_int32_t)ntohl(sav->spi), 1895 ipsec_address(&saidx->src, sbuf, sizeof(sbuf)), 1896 ipsec_address(&saidx->dst, dbuf, sizeof(dbuf))); 1897 1898 return buf; 1899 } 1900 1901 void 1902 ipsec_dumpmbuf(struct mbuf *m) 1903 { 1904 int totlen; 1905 int i; 1906 u_char *p; 1907 1908 totlen = 0; 1909 printf("---\n"); 1910 while (m) { 1911 p = mtod(m, u_char *); 1912 for (i = 0; i < m->m_len; i++) { 1913 printf("%02x ", p[i]); 1914 totlen++; 1915 if (totlen % 16 == 0) 1916 printf("\n"); 1917 } 1918 m = m->m_next; 1919 } 1920 if (totlen % 16 != 0) 1921 printf("\n"); 1922 printf("---\n"); 1923 } 1924 1925 #ifdef INET6 1926 struct secpolicy * 1927 ipsec6_check_policy(struct mbuf *m, struct in6pcb *in6p, int flags, 1928 int *needipsecp, int *errorp) 1929 { 1930 struct secpolicy *sp = NULL; 1931 int s; 1932 int error = 0; 1933 int needipsec = 0; 1934 1935 if (!ipsec_outdone(m)) { 1936 s = splsoftnet(); 1937 if (in6p != NULL && 1938 ipsec_pcb_skip_ipsec(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { 1939 splx(s); 1940 goto skippolicycheck; 1941 } 1942 sp = ipsec_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, 1943 in6p); 1944 1945 /* 1946 * There are four return cases: 1947 * sp != NULL apply IPsec policy 1948 * sp == NULL, error == 0 no IPsec handling needed 1949 * sp == NULL, error == -EINVAL discard packet w/o error 1950 * sp == NULL, error != 0 discard packet, report error 1951 */ 1952 1953 splx(s); 1954 if (sp == NULL) { 1955 /* 1956 * Caller must check the error return to see if it needs to discard 1957 * the packet. 1958 */ 1959 needipsec = 0; 1960 } else { 1961 needipsec = 1; 1962 } 1963 } 1964 skippolicycheck:; 1965 1966 *errorp = error; 1967 *needipsecp = needipsec; 1968 return sp; 1969 } 1970 1971 int 1972 ipsec6_input(struct mbuf *m) 1973 { 1974 int s, error; 1975 1976 s = splsoftnet(); 1977 error = ipsec_in_reject(m, NULL); 1978 splx(s); 1979 if (error) { 1980 return EINVAL; 1981 } 1982 1983 return 0; 1984 } 1985 #endif /* INET6 */ 1986 1987 /* 1988 * ----------------------------------------------------------------------------- 1989 */ 1990 1991 /* XXX this stuff doesn't belong here... */ 1992 1993 static struct xformsw *xforms = NULL; 1994 1995 /* 1996 * Register a transform; typically at system startup. 1997 */ 1998 void 1999 xform_register(struct xformsw *xsp) 2000 { 2001 xsp->xf_next = xforms; 2002 xforms = xsp; 2003 } 2004 2005 /* 2006 * Initialize transform support in an sav. 2007 */ 2008 int 2009 xform_init(struct secasvar *sav, int xftype) 2010 { 2011 struct xformsw *xsp; 2012 2013 if (sav->tdb_xform != NULL) /* previously initialized */ 2014 return 0; 2015 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2016 if (xsp->xf_type == xftype) 2017 return (*xsp->xf_init)(sav, xsp); 2018 2019 IPSECLOG(LOG_DEBUG, "no match for xform type %d\n", xftype); 2020 return EINVAL; 2021 } 2022 2023 void 2024 nat_t_ports_get(struct mbuf *m, u_int16_t *dport, u_int16_t *sport) 2025 { 2026 struct m_tag *tag; 2027 2028 if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) { 2029 *sport = ((u_int16_t *)(tag + 1))[0]; 2030 *dport = ((u_int16_t *)(tag + 1))[1]; 2031 } else 2032 *sport = *dport = 0; 2033 } 2034 2035 /* 2036 * XXXJRT This should be done as a protosw init call. 2037 */ 2038 void 2039 ipsec_attach(void) 2040 { 2041 2042 ipsec_output_init(); 2043 2044 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); 2045 2046 sysctl_net_inet_ipsec_setup(NULL); 2047 #ifdef INET6 2048 sysctl_net_inet6_ipsec6_setup(NULL); 2049 #endif 2050 2051 ah_attach(); 2052 esp_attach(); 2053 ipcomp_attach(); 2054 ipe4_attach(); 2055 #ifdef TCP_SIGNATURE 2056 tcpsignature_attach(); 2057 #endif 2058 } 2059
Indexes created Tue Sep 30 10:09:55 GMT 2025