1 /* $NetBSD: ipsec.c,v 1.60 2013/06/08 13:50:22 rmind Exp $ */ 2 /* $FreeBSD: /usr/local/www/cvsroot/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 1.60 2013/06/08 13:50:22 rmind Exp $"); 36 37 /* 38 * IPsec controller part. 39 */ 40 41 #include "opt_inet.h" 42 #ifdef __FreeBSD__ 43 #include "opt_inet6.h" 44 #endif 45 #include "opt_ipsec.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/malloc.h> 50 #include <sys/mbuf.h> 51 #include <sys/domain.h> 52 #include <sys/protosw.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/errno.h> 56 #include <sys/time.h> 57 #include <sys/kernel.h> 58 #include <sys/syslog.h> 59 #include <sys/sysctl.h> 60 #include <sys/proc.h> 61 #include <sys/kauth.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/ip.h> 69 #include <netinet/ip_var.h> 70 #include <netinet/in_var.h> 71 #include <netinet/udp.h> 72 #include <netinet/udp_var.h> 73 #include <netinet/tcp.h> 74 #include <netinet/udp.h> 75 #include <netinet/ip_icmp.h> 76 #include <netinet/ip_private.h> 77 78 #include <netinet/ip6.h> 79 #ifdef INET6 80 #include <netinet6/ip6_var.h> 81 #endif 82 #include <netinet/in_pcb.h> 83 #ifdef INET6 84 #include <netinet6/in6_pcb.h> 85 #include <netinet/icmp6.h> 86 #endif 87 88 #include <netipsec/ipsec.h> 89 #include <netipsec/ipsec_var.h> 90 #include <netipsec/ipsec_private.h> 91 #ifdef INET6 92 #include <netipsec/ipsec6.h> 93 #endif 94 #include <netipsec/ah_var.h> 95 #include <netipsec/esp_var.h> 96 #include <netipsec/ipcomp.h> /*XXX*/ 97 #include <netipsec/ipcomp_var.h> 98 99 #include <netipsec/key.h> 100 #include <netipsec/keydb.h> 101 #include <netipsec/key_debug.h> 102 103 #include <netipsec/xform.h> 104 105 #include <netipsec/ipsec_osdep.h> 106 107 #include <net/net_osdep.h> 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 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 129 int ip4_ipsec_dfbit = 2; /* DF bit on encap. 0: clear 1: set 2: copy */ 130 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 131 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 132 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 133 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 134 struct secpolicy ip4_def_policy; 135 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 136 int ip4_esp_randpad = -1; 137 138 #ifdef __NetBSD__ 139 u_int ipsec_spdgen = 1; /* SPD generation # */ 140 141 static struct secpolicy *ipsec_checkpcbcache (struct mbuf *, 142 struct inpcbpolicy *, int); 143 static int ipsec_fillpcbcache (struct inpcbpolicy *, struct mbuf *, 144 struct secpolicy *, int); 145 static int ipsec_invalpcbcache (struct inpcbpolicy *, int); 146 #endif /* __NetBSD__ */ 147 148 /* 149 * Crypto support requirements: 150 * 151 * 1 require hardware support 152 * -1 require software support 153 * 0 take anything 154 */ 155 int crypto_support = 0; 156 157 static struct secpolicy *ipsec_getpolicybysock(struct mbuf *, u_int, 158 PCB_T *, int *); 159 160 #ifdef __FreeBSD__ 161 SYSCTL_DECL(_net_inet_ipsec); 162 163 /* net.inet.ipsec */ 164 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 165 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 166 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 167 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 168 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 169 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 170 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 171 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 172 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 173 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 174 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 175 ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, ""); 176 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 177 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 178 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 179 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 180 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 181 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 182 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 183 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 184 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 185 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 186 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 187 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 188 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 189 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 190 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 191 "Emulate replay attack"); 192 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 193 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 194 #endif /* __FreeBSD__ */ 195 196 #ifdef INET6 197 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 198 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 199 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 200 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 201 struct secpolicy ip6_def_policy; 202 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 203 int ip6_esp_randpad = -1; 204 205 206 #ifdef __FreeBSD__ 207 SYSCTL_DECL(_net_inet6_ipsec6); 208 209 /* net.inet6.ipsec6 */ 210 #ifdef COMPAT_KAME 211 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 212 0,0, compat_ipsecstats_sysctl, "S", ""); 213 #endif /* COMPAT_KAME */ 214 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 215 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 216 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 217 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 218 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 219 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 220 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 221 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 222 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 223 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 224 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 225 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 226 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 227 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 228 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 229 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 230 #endif /* INET6 */ 231 #endif /* __FreeBSD__ */ 232 233 static int ipsec4_setspidx_inpcb (struct mbuf *, struct inpcb *); 234 #ifdef INET6 235 static int ipsec6_setspidx_in6pcb (struct mbuf *, struct in6pcb *); 236 #endif 237 static int ipsec_setspidx (struct mbuf *, struct secpolicyindex *, int); 238 static void ipsec4_get_ulp (struct mbuf *m, struct secpolicyindex *, int); 239 static int ipsec4_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); 240 #ifdef INET6 241 static void ipsec6_get_ulp (struct mbuf *m, struct secpolicyindex *, int); 242 static int ipsec6_setspidx_ipaddr (struct mbuf *, struct secpolicyindex *); 243 #endif 244 static void ipsec_delpcbpolicy (struct inpcbpolicy *); 245 static struct secpolicy *ipsec_deepcopy_policy (const struct secpolicy *); 246 static int ipsec_set_policy (struct secpolicy **, int, const void *, size_t, 247 kauth_cred_t); 248 static int ipsec_get_policy (struct secpolicy *, struct mbuf **); 249 static void vshiftl (unsigned char *, int, int); 250 static size_t ipsec_hdrsiz (const struct secpolicy *); 251 252 #ifdef __NetBSD__ 253 /* 254 * Try to validate and use cached policy on a PCB. 255 */ 256 static struct secpolicy * 257 ipsec_checkpcbcache(struct mbuf *m, struct inpcbpolicy *pcbsp, int dir) 258 { 259 struct secpolicyindex spidx; 260 261 switch (dir) { 262 case IPSEC_DIR_INBOUND: 263 case IPSEC_DIR_OUTBOUND: 264 case IPSEC_DIR_ANY: 265 break; 266 default: 267 return NULL; 268 } 269 #ifdef DIAGNOSTIC 270 if (pcbsp == NULL) { 271 printf("ipsec_checkpcbcache: NULL pcbsp\n"); 272 /* XXX panic? */ 273 return NULL; 274 } 275 #endif 276 277 #ifdef DIAGNOSTIC 278 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 279 panic("dir too big in ipsec_checkpcbcache"); 280 #endif 281 /* SPD table change invalidate all the caches. */ 282 if (ipsec_spdgen != pcbsp->sp_cache[dir].cachegen) { 283 ipsec_invalpcbcache(pcbsp, dir); 284 return NULL; 285 } 286 if (!pcbsp->sp_cache[dir].cachesp) 287 return NULL; 288 if (pcbsp->sp_cache[dir].cachesp->state != IPSEC_SPSTATE_ALIVE) { 289 ipsec_invalpcbcache(pcbsp, dir); 290 return NULL; 291 } 292 if ((pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) == 0) { 293 if (!pcbsp->sp_cache[dir].cachesp) 294 return NULL; 295 if (ipsec_setspidx(m, &spidx, 1) != 0) 296 return NULL; 297 298 /* 299 * We have to make an exact match here since the cached rule 300 * might have lower priority than a rule that would otherwise 301 * have matched the packet. 302 */ 303 304 if (memcmp(&pcbsp->sp_cache[dir].cacheidx, &spidx, sizeof(spidx))) 305 return NULL; 306 307 } else { 308 /* 309 * The pcb is connected, and the L4 code is sure that: 310 * - outgoing side uses inp_[lf]addr 311 * - incoming side looks up policy after inpcb lookup 312 * and address pair is know to be stable. We do not need 313 * to generate spidx again, nor check the address match again. 314 * 315 * For IPv4/v6 SOCK_STREAM sockets, this assumptions holds 316 * and there are calls to ipsec_pcbconn() from in_pcbconnect(). 317 */ 318 } 319 320 pcbsp->sp_cache[dir].cachesp->lastused = time_second; 321 pcbsp->sp_cache[dir].cachesp->refcnt++; 322 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 323 printf("DP ipsec_checkpcbcache cause refcnt++:%d SP:%p\n", 324 pcbsp->sp_cache[dir].cachesp->refcnt, 325 pcbsp->sp_cache[dir].cachesp)); 326 return pcbsp->sp_cache[dir].cachesp; 327 } 328 329 static int 330 ipsec_fillpcbcache(struct inpcbpolicy *pcbsp, struct mbuf *m, 331 struct secpolicy *sp, int dir) 332 { 333 334 switch (dir) { 335 case IPSEC_DIR_INBOUND: 336 case IPSEC_DIR_OUTBOUND: 337 break; 338 default: 339 return EINVAL; 340 } 341 #ifdef DIAGNOSTIC 342 if (dir >= sizeof(pcbsp->sp_cache)/sizeof(pcbsp->sp_cache[0])) 343 panic("dir too big in ipsec_fillpcbcache"); 344 #endif 345 346 if (pcbsp->sp_cache[dir].cachesp) 347 KEY_FREESP(&pcbsp->sp_cache[dir].cachesp); 348 pcbsp->sp_cache[dir].cachesp = NULL; 349 pcbsp->sp_cache[dir].cachehint = IPSEC_PCBHINT_MAYBE; 350 if (ipsec_setspidx(m, &pcbsp->sp_cache[dir].cacheidx, 1) != 0) { 351 return EINVAL; 352 } 353 pcbsp->sp_cache[dir].cachesp = sp; 354 if (pcbsp->sp_cache[dir].cachesp) { 355 pcbsp->sp_cache[dir].cachesp->refcnt++; 356 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 357 printf("DP ipsec_fillpcbcache cause refcnt++:%d SP:%p\n", 358 pcbsp->sp_cache[dir].cachesp->refcnt, 359 pcbsp->sp_cache[dir].cachesp)); 360 361 /* 362 * If the PCB is connected, we can remember a hint to 363 * possibly short-circuit IPsec processing in other places. 364 */ 365 if (pcbsp->sp_cacheflags & IPSEC_PCBSP_CONNECTED) { 366 switch (pcbsp->sp_cache[dir].cachesp->policy) { 367 case IPSEC_POLICY_NONE: 368 case IPSEC_POLICY_BYPASS: 369 pcbsp->sp_cache[dir].cachehint = 370 IPSEC_PCBHINT_NO; 371 break; 372 default: 373 pcbsp->sp_cache[dir].cachehint = 374 IPSEC_PCBHINT_YES; 375 } 376 } 377 } 378 pcbsp->sp_cache[dir].cachegen = ipsec_spdgen; 379 380 return 0; 381 } 382 383 static int 384 ipsec_invalpcbcache(struct inpcbpolicy *pcbsp, int dir) 385 { 386 int i; 387 388 for (i = IPSEC_DIR_INBOUND; i <= IPSEC_DIR_OUTBOUND; i++) { 389 if (dir != IPSEC_DIR_ANY && i != dir) 390 continue; 391 if (pcbsp->sp_cache[i].cachesp) 392 KEY_FREESP(&pcbsp->sp_cache[i].cachesp); 393 pcbsp->sp_cache[i].cachesp = NULL; 394 pcbsp->sp_cache[i].cachehint = IPSEC_PCBHINT_MAYBE; 395 pcbsp->sp_cache[i].cachegen = 0; 396 memset(&pcbsp->sp_cache[i].cacheidx, 0, 397 sizeof(pcbsp->sp_cache[i].cacheidx)); 398 } 399 return 0; 400 } 401 402 void 403 ipsec_pcbconn(struct inpcbpolicy *pcbsp) 404 { 405 406 pcbsp->sp_cacheflags |= IPSEC_PCBSP_CONNECTED; 407 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 408 } 409 410 void 411 ipsec_pcbdisconn(struct inpcbpolicy *pcbsp) 412 { 413 414 pcbsp->sp_cacheflags &= ~IPSEC_PCBSP_CONNECTED; 415 ipsec_invalpcbcache(pcbsp, IPSEC_DIR_ANY); 416 } 417 418 void 419 ipsec_invalpcbcacheall(void) 420 { 421 422 if (ipsec_spdgen == UINT_MAX) 423 ipsec_spdgen = 1; 424 else 425 ipsec_spdgen++; 426 } 427 #endif /* __NetBSD__ */ 428 429 /* 430 * Return a held reference to the default SP. 431 */ 432 static struct secpolicy * 433 key_allocsp_default(int af, const char *where, int tag) 434 { 435 struct secpolicy *sp; 436 437 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 438 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 439 440 switch(af) { 441 case AF_INET: 442 sp = &ip4_def_policy; 443 break; 444 #ifdef INET6 445 case AF_INET6: 446 sp = &ip6_def_policy; 447 break; 448 #endif 449 default: 450 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 451 printf("key_allocsp_default : unexpected protocol family %u\n", 452 af)); 453 return NULL; 454 } 455 456 if (sp->policy != IPSEC_POLICY_DISCARD && 457 sp->policy != IPSEC_POLICY_NONE) { 458 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 459 sp->policy, IPSEC_POLICY_NONE)); 460 sp->policy = IPSEC_POLICY_NONE; 461 } 462 sp->refcnt++; 463 464 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 465 printf("DP key_allocsp_default returns SP:%p (%u)\n", 466 sp, sp->refcnt)); 467 return sp; 468 } 469 #define KEY_ALLOCSP_DEFAULT(af) \ 470 key_allocsp_default((af),__FILE__, __LINE__) 471 472 /* 473 * For OUTBOUND packet having a socket. Searching SPD for packet, 474 * and return a pointer to SP. 475 * OUT: NULL: no apropreate SP found, the following value is set to error. 476 * 0 : bypass 477 * EACCES : discard packet. 478 * ENOENT : ipsec_acquire() in progress, maybe. 479 * others : error occurred. 480 * others: a pointer to SP 481 * 482 * NOTE: IPv6 mapped address concern is implemented here. 483 */ 484 struct secpolicy * 485 ipsec_getpolicy(const struct tdb_ident *tdbi, u_int dir) 486 { 487 struct secpolicy *sp; 488 489 IPSEC_ASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 490 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 491 ("ipsec_getpolicy: invalid direction %u", dir)); 492 493 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 494 if (sp == NULL) /*XXX????*/ 495 sp = KEY_ALLOCSP_DEFAULT(tdbi->dst.sa.sa_family); 496 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 497 return sp; 498 } 499 500 /* 501 * For OUTBOUND packet having a socket. Searching SPD for packet, 502 * and return a pointer to SP. 503 * OUT: NULL: no apropreate SP found, the following value is set to error. 504 * 0 : bypass 505 * EACCES : discard packet. 506 * ENOENT : ipsec_acquire() in progress, maybe. 507 * others : error occurred. 508 * others: a pointer to SP 509 * 510 * NOTE: IPv6 mapped address concern is implemented here. 511 */ 512 static struct secpolicy * 513 ipsec_getpolicybysock(struct mbuf *m, u_int dir, PCB_T *inp, int *error) 514 { 515 struct inpcbpolicy *pcbsp = NULL; 516 struct secpolicy *currsp = NULL; /* policy on socket */ 517 struct secpolicy *sp; 518 int af; 519 520 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 521 IPSEC_ASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 522 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 523 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 524 ("ipsec_getpolicybysock: invalid direction %u", dir)); 525 526 IPSEC_ASSERT(PCB_SOCKET(inp) != NULL, 527 ("ipsec_getppolicybysock: null socket\n")); 528 529 /* XXX FIXME inpcb/in6pcb vs socket*/ 530 af = PCB_FAMILY(inp); 531 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 532 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 533 534 #ifdef __NetBSD__ 535 IPSEC_ASSERT(inp->inph_sp != NULL, ("null PCB policy cache")); 536 /* If we have a cached entry, and if it is still valid, use it. */ 537 IPSEC_STATINC(IPSEC_STAT_SPDCACHELOOKUP); 538 currsp = ipsec_checkpcbcache(m, /*inpcb_hdr*/inp->inph_sp, dir); 539 if (currsp) { 540 *error = 0; 541 return currsp; 542 } 543 IPSEC_STATINC(IPSEC_STAT_SPDCACHEMISS); 544 #endif /* __NetBSD__ */ 545 546 switch (af) { 547 case AF_INET: { 548 struct inpcb *in4p = PCB_TO_IN4PCB(inp); 549 /* set spidx in pcb */ 550 *error = ipsec4_setspidx_inpcb(m, in4p); 551 pcbsp = in4p->inp_sp; 552 break; 553 } 554 555 #if defined(INET6) 556 case AF_INET6: { 557 struct in6pcb *in6p = PCB_TO_IN6PCB(inp); 558 /* set spidx in pcb */ 559 *error = ipsec6_setspidx_in6pcb(m, in6p); 560 pcbsp = in6p->in6p_sp; 561 break; 562 } 563 #endif 564 default: 565 *error = EPFNOSUPPORT; 566 break; 567 } 568 if (*error) 569 return NULL; 570 571 IPSEC_ASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 572 switch (dir) { 573 case IPSEC_DIR_INBOUND: 574 currsp = pcbsp->sp_in; 575 break; 576 case IPSEC_DIR_OUTBOUND: 577 currsp = pcbsp->sp_out; 578 break; 579 } 580 IPSEC_ASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 581 582 if (pcbsp->priv) { /* when privilieged socket */ 583 switch (currsp->policy) { 584 case IPSEC_POLICY_BYPASS: 585 case IPSEC_POLICY_IPSEC: 586 currsp->refcnt++; 587 sp = currsp; 588 break; 589 590 case IPSEC_POLICY_ENTRUST: 591 /* look for a policy in SPD */ 592 sp = KEY_ALLOCSP(&currsp->spidx, dir); 593 if (sp == NULL) /* no SP found */ 594 sp = KEY_ALLOCSP_DEFAULT(af); 595 break; 596 597 default: 598 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 599 "Invalid policy for PCB %d\n", currsp->policy)); 600 *error = EINVAL; 601 return NULL; 602 } 603 } else { /* unpriv, SPD has policy */ 604 sp = KEY_ALLOCSP(&currsp->spidx, dir); 605 if (sp == NULL) { /* no SP found */ 606 switch (currsp->policy) { 607 case IPSEC_POLICY_BYPASS: 608 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 609 "Illegal policy for non-priviliged defined %d\n", 610 currsp->policy)); 611 *error = EINVAL; 612 return NULL; 613 614 case IPSEC_POLICY_ENTRUST: 615 sp = KEY_ALLOCSP_DEFAULT(af); 616 break; 617 618 case IPSEC_POLICY_IPSEC: 619 currsp->refcnt++; 620 sp = currsp; 621 break; 622 623 default: 624 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 625 "Invalid policy for PCB %d\n", currsp->policy)); 626 *error = EINVAL; 627 return NULL; 628 } 629 } 630 } 631 IPSEC_ASSERT(sp != NULL, 632 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 633 pcbsp->priv, currsp->policy)); 634 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 635 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 636 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 637 sp, sp->refcnt)); 638 #ifdef __NetBSD__ 639 ipsec_fillpcbcache(pcbsp, m, sp, dir); 640 #endif /* __NetBSD__ */ 641 return sp; 642 } 643 644 /* 645 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 646 * and return a pointer to SP. 647 * OUT: positive: a pointer to the entry for security policy leaf matched. 648 * NULL: no apropreate SP found, the following value is set to error. 649 * 0 : bypass 650 * EACCES : discard packet. 651 * ENOENT : ipsec_acquire() in progress, maybe. 652 * others : error occurred. 653 */ 654 struct secpolicy * 655 ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 656 { 657 struct secpolicyindex spidx; 658 struct secpolicy *sp; 659 660 IPSEC_ASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 661 IPSEC_ASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 662 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 663 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 664 665 sp = NULL; 666 667 /* Make an index to look for a policy. */ 668 *error = ipsec_setspidx(m, &spidx, (flag & IP_FORWARDING) ? 0 : 1); 669 if (*error != 0) { 670 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 671 " dir %u flag %u\n", dir, flag)); 672 memset(&spidx, 0, sizeof (spidx)); 673 return NULL; 674 } 675 676 spidx.dir = dir; 677 678 if (key_havesp(dir)) { 679 sp = KEY_ALLOCSP(&spidx, dir); 680 } 681 682 if (sp == NULL) /* no SP found, use system default */ 683 sp = KEY_ALLOCSP_DEFAULT(spidx.dst.sa.sa_family); 684 IPSEC_ASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 685 return sp; 686 } 687 688 struct secpolicy * 689 ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 690 struct inpcb *inp) 691 { 692 struct secpolicy *sp; 693 694 *error = 0; 695 696 697 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 698 if (inp == NULL || inp->inp_socket == NULL) { 699 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 700 } else 701 sp = ipsec_getpolicybysock(m, dir, IN4PCB_TO_PCB(inp), error); 702 if (sp == NULL) { 703 IPSEC_ASSERT(*error != 0, 704 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 705 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 706 return NULL; 707 } 708 IPSEC_ASSERT(*error == 0, 709 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 710 switch (sp->policy) { 711 case IPSEC_POLICY_ENTRUST: 712 default: 713 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 714 /* fall thru... */ 715 case IPSEC_POLICY_DISCARD: 716 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 717 *error = -EINVAL; /* packet is discarded by caller */ 718 break; 719 case IPSEC_POLICY_BYPASS: 720 case IPSEC_POLICY_NONE: 721 KEY_FREESP(&sp); 722 sp = NULL; /* NB: force NULL result */ 723 break; 724 case IPSEC_POLICY_IPSEC: 725 if (sp->req == NULL) /* acquire an SA */ 726 *error = key_spdacquire(sp); 727 break; 728 } 729 if (*error != 0) { 730 KEY_FREESP(&sp); 731 sp = NULL; 732 DPRINTF(("%s: done, error %d\n", __func__, *error)); 733 } 734 return sp; 735 } 736 737 int 738 ipsec4_output(struct mbuf *m, struct socket *so, int flags, 739 struct secpolicy **sp_out, u_long *mtu, bool *natt_frag, bool *done) 740 { 741 const struct ip *ip = mtod(m, const struct ip *); 742 struct secpolicy *sp = NULL; 743 struct inpcb *inp; 744 int error, s; 745 746 inp = (so && so->so_proto->pr_domain->dom_family == AF_INET) ? 747 (struct inpcb *)so->so_pcb : NULL; 748 749 /* 750 * Check the security policy (SP) for the packet and, if required, 751 * do IPsec-related processing. There are two cases here; the first 752 * time a packet is sent through it will be untagged and handled by 753 * ipsec4_checkpolicy(). If the packet is resubmitted to ip_output 754 * (e.g. after AH, ESP, etc. processing), there will be a tag to 755 * bypass the lookup and related policy checking. 756 */ 757 if (ipsec_outdone(m)) { 758 return 0; 759 } 760 s = splsoftnet(); 761 if (inp && IPSEC_PCB_SKIP_IPSEC(inp->inp_sp, IPSEC_DIR_OUTBOUND)) { 762 splx(s); 763 return 0; 764 } 765 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, inp); 766 767 /* 768 * There are four return cases: 769 * sp != NULL apply IPsec policy 770 * sp == NULL, error == 0 no IPsec handling needed 771 * sp == NULL, error == -EINVAL discard packet w/o error 772 * sp == NULL, error != 0 discard packet, report error 773 */ 774 if (sp == NULL) { 775 splx(s); 776 if (error) { 777 /* 778 * Hack: -EINVAL is used to signal that a packet 779 * should be silently discarded. This is typically 780 * because we asked key management for an SA and 781 * it was delayed (e.g. kicked up to IKE). 782 */ 783 if (error == -EINVAL) 784 error = 0; 785 m_freem(m); 786 *done = true; 787 return error; 788 } 789 /* No IPsec processing for this packet. */ 790 return 0; 791 } 792 *sp_out = sp; 793 794 /* 795 * NAT-T ESP fragmentation: do not do IPSec processing now, 796 * we will do it on each fragmented packet. 797 */ 798 if (sp->req->sav && (sp->req->sav->natt_type & 799 (UDP_ENCAP_ESPINUDP|UDP_ENCAP_ESPINUDP_NON_IKE))) { 800 if (ntohs(ip->ip_len) > sp->req->sav->esp_frag) { 801 *mtu = sp->req->sav->esp_frag; 802 *natt_frag = true; 803 splx(s); 804 return 0; 805 } 806 } 807 808 /* 809 * Do delayed checksums now because we send before 810 * this is done in the normal processing path. 811 */ 812 if (m->m_pkthdr.csum_flags & (M_CSUM_TCPv4|M_CSUM_UDPv4)) { 813 in_delayed_cksum(m); 814 m->m_pkthdr.csum_flags &= ~(M_CSUM_TCPv4|M_CSUM_UDPv4); 815 } 816 817 /* Note: callee frees mbuf */ 818 error = ipsec4_process_packet(m, sp->req, flags, 0); 819 /* 820 * Preserve KAME behaviour: ENOENT can be returned 821 * when an SA acquire is in progress. Don't propagate 822 * this to user-level; it confuses applications. 823 * 824 * XXX this will go away when the SADB is redone. 825 */ 826 if (error == ENOENT) 827 error = 0; 828 splx(s); 829 *done = true; 830 return error; 831 } 832 833 int 834 ipsec4_input(struct mbuf *m, int flags) 835 { 836 struct m_tag *mtag; 837 struct tdb_ident *tdbi; 838 struct secpolicy *sp; 839 int error, s; 840 841 /* 842 * Check if the packet has already had IPsec processing done. 843 * If so, then just pass it along. This tag gets set during AH, 844 * ESP, etc. input handling, before the packet is returned to 845 * the IP input queue for delivery. 846 */ 847 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 848 s = splsoftnet(); 849 if (mtag != NULL) { 850 tdbi = (struct tdb_ident *)(mtag + 1); 851 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 852 } else { 853 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 854 IP_FORWARDING, &error); 855 } 856 if (sp == NULL) { 857 splx(s); 858 return EINVAL; 859 } 860 861 /* 862 * Check security policy against packet attributes. 863 */ 864 error = ipsec_in_reject(sp, m); 865 KEY_FREESP(&sp); 866 splx(s); 867 if (error) { 868 return error; 869 } 870 871 if (flags == 0) { 872 /* We are done. */ 873 return 0; 874 } 875 876 /* 877 * Peek at the outbound SP for this packet to determine if 878 * it is a Fast Forward candidate. 879 */ 880 mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL); 881 if (mtag != NULL) { 882 m->m_flags &= ~M_CANFASTFWD; 883 return 0; 884 } 885 886 s = splsoftnet(); 887 sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error, NULL); 888 if (sp != NULL) { 889 m->m_flags &= ~M_CANFASTFWD; 890 KEY_FREESP(&sp); 891 } 892 splx(s); 893 return 0; 894 } 895 896 int 897 ipsec4_forward(struct mbuf *m, int *destmtu) 898 { 899 /* 900 * If the packet is routed over IPsec tunnel, tell the 901 * originator the tunnel MTU. 902 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz 903 * XXX quickhack!!! 904 */ 905 struct secpolicy *sp; 906 size_t ipsechdr; 907 int error; 908 909 sp = ipsec4_getpolicybyaddr(m, 910 IPSEC_DIR_OUTBOUND, IP_FORWARDING, &error); 911 if (sp == NULL) { 912 return EINVAL; 913 } 914 915 /* Count IPsec header size. */ 916 ipsechdr = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, NULL); 917 918 /* 919 * Find the correct route for outer IPv4 header, compute tunnel MTU. 920 */ 921 if (sp->req && sp->req->sav && sp->req->sav->sah) { 922 struct route *ro; 923 struct rtentry *rt; 924 925 ro = &sp->req->sav->sah->sa_route; 926 rt = rtcache_validate(ro); 927 if (rt && rt->rt_ifp) { 928 *destmtu = rt->rt_rmx.rmx_mtu ? 929 rt->rt_rmx.rmx_mtu : rt->rt_ifp->if_mtu; 930 *destmtu -= ipsechdr; 931 } 932 } 933 KEY_FREESP(&sp); 934 return 0; 935 } 936 937 #ifdef INET6 938 struct secpolicy * 939 ipsec6_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 940 struct in6pcb *in6p) 941 { 942 struct secpolicy *sp; 943 944 *error = 0; 945 946 947 /* XXX KAME IPv6 calls us with non-null inp but bogus inp_socket? */ 948 if (in6p == NULL || in6p->in6p_socket == NULL) { 949 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 950 } else 951 sp = ipsec_getpolicybysock(m, dir, IN6PCB_TO_PCB(in6p), error); 952 if (sp == NULL) { 953 IPSEC_ASSERT(*error != 0, 954 ("ipsec6_checkpolicy: getpolicy failed w/o error")); 955 IPSEC_STATINC(IPSEC_STAT_OUT_INVAL); 956 return NULL; 957 } 958 IPSEC_ASSERT(*error == 0, 959 ("ipsec6_checkpolicy: sp w/ error set to %u", *error)); 960 switch (sp->policy) { 961 case IPSEC_POLICY_ENTRUST: 962 default: 963 printf("ipsec6_checkpolicy: invalid policy %u\n", sp->policy); 964 /* fall thru... */ 965 case IPSEC_POLICY_DISCARD: 966 IPSEC_STATINC(IPSEC_STAT_OUT_POLVIO); 967 *error = -EINVAL; /* packet is discarded by caller */ 968 break; 969 case IPSEC_POLICY_BYPASS: 970 case IPSEC_POLICY_NONE: 971 KEY_FREESP(&sp); 972 sp = NULL; /* NB: force NULL result */ 973 break; 974 case IPSEC_POLICY_IPSEC: 975 if (sp->req == NULL) /* acquire an SA */ 976 *error = key_spdacquire(sp); 977 break; 978 } 979 if (*error != 0) { 980 KEY_FREESP(&sp); 981 sp = NULL; 982 DPRINTF(("%s: done, error %d\n", __func__, *error)); 983 } 984 return sp; 985 } 986 #endif /* INET6 */ 987 988 static int 989 ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *pcb) 990 { 991 int error; 992 993 IPSEC_ASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 994 IPSEC_ASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 995 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 996 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 997 998 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 999 if (error == 0) { 1000 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 1001 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 1002 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 1003 } else { 1004 memset(&pcb->inp_sp->sp_in->spidx, 0, 1005 sizeof (pcb->inp_sp->sp_in->spidx)); 1006 memset(&pcb->inp_sp->sp_out->spidx, 0, 1007 sizeof (pcb->inp_sp->sp_in->spidx)); 1008 } 1009 return error; 1010 } 1011 1012 #ifdef INET6 1013 static int 1014 ipsec6_setspidx_in6pcb(struct mbuf *m, struct in6pcb *pcb) 1015 { 1016 struct secpolicyindex *spidx; 1017 int error; 1018 1019 IPSEC_ASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 1020 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 1021 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 1022 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 1023 1024 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 1025 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 1026 1027 spidx = &pcb->in6p_sp->sp_in->spidx; 1028 error = ipsec_setspidx(m, spidx, 1); 1029 if (error) 1030 goto bad; 1031 spidx->dir = IPSEC_DIR_INBOUND; 1032 1033 spidx = &pcb->in6p_sp->sp_out->spidx; 1034 error = ipsec_setspidx(m, spidx, 1); 1035 if (error) 1036 goto bad; 1037 spidx->dir = IPSEC_DIR_OUTBOUND; 1038 1039 return 0; 1040 1041 bad: 1042 memset(&pcb->in6p_sp->sp_in->spidx, 0, sizeof(*spidx)); 1043 memset(&pcb->in6p_sp->sp_out->spidx, 0, sizeof(*spidx)); 1044 return error; 1045 } 1046 #endif 1047 1048 /* 1049 * configure security policy index (src/dst/proto/sport/dport) 1050 * by looking at the content of mbuf. 1051 * the caller is responsible for error recovery (like clearing up spidx). 1052 */ 1053 static int 1054 ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 1055 { 1056 struct ip *ip = NULL; 1057 struct ip ipbuf; 1058 u_int v; 1059 struct mbuf *n; 1060 int len; 1061 int error; 1062 1063 IPSEC_ASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 1064 1065 /* 1066 * validate m->m_pkthdr.len. we see incorrect length if we 1067 * mistakenly call this function with inconsistent mbuf chain 1068 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 1069 */ 1070 len = 0; 1071 for (n = m; n; n = n->m_next) 1072 len += n->m_len; 1073 if (m->m_pkthdr.len != len) { 1074 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1075 printf("ipsec_setspidx: " 1076 "total of m_len(%d) != pkthdr.len(%d), " 1077 "ignored.\n", 1078 len, m->m_pkthdr.len)); 1079 return EINVAL; 1080 } 1081 1082 if (m->m_pkthdr.len < sizeof(struct ip)) { 1083 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1084 printf("ipsec_setspidx: " 1085 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 1086 m->m_pkthdr.len)); 1087 return EINVAL; 1088 } 1089 1090 if (m->m_len >= sizeof(*ip)) 1091 ip = mtod(m, struct ip *); 1092 else { 1093 m_copydata(m, 0, sizeof(ipbuf), &ipbuf); 1094 ip = &ipbuf; 1095 } 1096 v = ip->ip_v; 1097 switch (v) { 1098 case 4: 1099 error = ipsec4_setspidx_ipaddr(m, spidx); 1100 if (error) 1101 return error; 1102 ipsec4_get_ulp(m, spidx, needport); 1103 return 0; 1104 #ifdef INET6 1105 case 6: 1106 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 1107 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1108 printf("ipsec_setspidx: " 1109 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 1110 "ignored.\n", m->m_pkthdr.len)); 1111 return EINVAL; 1112 } 1113 error = ipsec6_setspidx_ipaddr(m, spidx); 1114 if (error) 1115 return error; 1116 ipsec6_get_ulp(m, spidx, needport); 1117 return 0; 1118 #endif 1119 default: 1120 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1121 printf("ipsec_setspidx: " 1122 "unknown IP version %u, ignored.\n", v)); 1123 return EINVAL; 1124 } 1125 } 1126 1127 static void 1128 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 1129 { 1130 u_int8_t nxt; 1131 int off; 1132 1133 /* sanity check */ 1134 IPSEC_ASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 1135 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip), 1136 ("ipsec4_get_ulp: packet too short")); 1137 1138 /* NB: ip_input() flips it into host endian XXX need more checking */ 1139 if (m->m_len >= sizeof(struct ip)) { 1140 struct ip *ip = mtod(m, struct ip *); 1141 if (ip->ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 1142 goto done; 1143 off = ip->ip_hl << 2; 1144 nxt = ip->ip_p; 1145 } else { 1146 struct ip ih; 1147 1148 m_copydata(m, 0, sizeof (struct ip), &ih); 1149 if (ih.ip_off & IP_OFF_CONVERT(IP_MF | IP_OFFMASK)) 1150 goto done; 1151 off = ih.ip_hl << 2; 1152 nxt = ih.ip_p; 1153 } 1154 1155 while (off < m->m_pkthdr.len) { 1156 struct ip6_ext ip6e; 1157 struct tcphdr th; 1158 struct udphdr uh; 1159 struct icmp icmph; 1160 1161 switch (nxt) { 1162 case IPPROTO_TCP: 1163 spidx->ul_proto = nxt; 1164 if (!needport) 1165 goto done_proto; 1166 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1167 goto done; 1168 m_copydata(m, off, sizeof (th), &th); 1169 spidx->src.sin.sin_port = th.th_sport; 1170 spidx->dst.sin.sin_port = th.th_dport; 1171 return; 1172 case IPPROTO_UDP: 1173 spidx->ul_proto = nxt; 1174 if (!needport) 1175 goto done_proto; 1176 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1177 goto done; 1178 m_copydata(m, off, sizeof (uh), &uh); 1179 spidx->src.sin.sin_port = uh.uh_sport; 1180 spidx->dst.sin.sin_port = uh.uh_dport; 1181 return; 1182 case IPPROTO_AH: 1183 if (m->m_pkthdr.len > off + sizeof(ip6e)) 1184 goto done; 1185 /* XXX sigh, this works but is totally bogus */ 1186 m_copydata(m, off, sizeof(ip6e), &ip6e); 1187 off += (ip6e.ip6e_len + 2) << 2; 1188 nxt = ip6e.ip6e_nxt; 1189 break; 1190 case IPPROTO_ICMP: 1191 spidx->ul_proto = nxt; 1192 if (off + sizeof(struct icmp) > m->m_pkthdr.len) 1193 return; 1194 m_copydata(m, off, sizeof(icmph), &icmph); 1195 ((struct sockaddr_in *)&spidx->src)->sin_port = 1196 htons((uint16_t)icmph.icmp_type); 1197 ((struct sockaddr_in *)&spidx->dst)->sin_port = 1198 htons((uint16_t)icmph.icmp_code); 1199 return; 1200 default: 1201 /* XXX intermediate headers??? */ 1202 spidx->ul_proto = nxt; 1203 goto done_proto; 1204 } 1205 } 1206 done: 1207 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1208 done_proto: 1209 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 1210 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 1211 } 1212 1213 /* assumes that m is sane */ 1214 static int 1215 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1216 { 1217 static const struct sockaddr_in template = { 1218 sizeof (struct sockaddr_in), 1219 AF_INET, 1220 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 1221 }; 1222 1223 spidx->src.sin = template; 1224 spidx->dst.sin = template; 1225 1226 if (m->m_len < sizeof (struct ip)) { 1227 m_copydata(m, offsetof(struct ip, ip_src), 1228 sizeof (struct in_addr), 1229 &spidx->src.sin.sin_addr); 1230 m_copydata(m, offsetof(struct ip, ip_dst), 1231 sizeof (struct in_addr), 1232 &spidx->dst.sin.sin_addr); 1233 } else { 1234 struct ip *ip = mtod(m, struct ip *); 1235 spidx->src.sin.sin_addr = ip->ip_src; 1236 spidx->dst.sin.sin_addr = ip->ip_dst; 1237 } 1238 1239 spidx->prefs = sizeof(struct in_addr) << 3; 1240 spidx->prefd = sizeof(struct in_addr) << 3; 1241 1242 return 0; 1243 } 1244 1245 #ifdef INET6 1246 static void 1247 ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, 1248 int needport) 1249 { 1250 int off, nxt; 1251 struct tcphdr th; 1252 struct udphdr uh; 1253 struct icmp6_hdr icmph; 1254 1255 /* sanity check */ 1256 if (m == NULL) 1257 panic("ipsec6_get_ulp: NULL pointer was passed"); 1258 1259 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1260 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 1261 1262 /* set default */ 1263 spidx->ul_proto = IPSEC_ULPROTO_ANY; 1264 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 1265 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 1266 1267 nxt = -1; 1268 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 1269 if (off < 0 || m->m_pkthdr.len < off) 1270 return; 1271 1272 switch (nxt) { 1273 case IPPROTO_TCP: 1274 spidx->ul_proto = nxt; 1275 if (!needport) 1276 break; 1277 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 1278 break; 1279 m_copydata(m, off, sizeof(th), &th); 1280 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 1281 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 1282 break; 1283 case IPPROTO_UDP: 1284 spidx->ul_proto = nxt; 1285 if (!needport) 1286 break; 1287 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 1288 break; 1289 m_copydata(m, off, sizeof(uh), &uh); 1290 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 1291 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 1292 break; 1293 case IPPROTO_ICMPV6: 1294 spidx->ul_proto = nxt; 1295 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 1296 break; 1297 m_copydata(m, off, sizeof(icmph), &icmph); 1298 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 1299 htons((uint16_t)icmph.icmp6_type); 1300 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 1301 htons((uint16_t)icmph.icmp6_code); 1302 break; 1303 default: 1304 /* XXX intermediate headers??? */ 1305 spidx->ul_proto = nxt; 1306 break; 1307 } 1308 } 1309 1310 /* assumes that m is sane */ 1311 static int 1312 ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 1313 { 1314 struct ip6_hdr *ip6 = NULL; 1315 struct ip6_hdr ip6buf; 1316 struct sockaddr_in6 *sin6; 1317 1318 if (m->m_len >= sizeof(*ip6)) 1319 ip6 = mtod(m, struct ip6_hdr *); 1320 else { 1321 m_copydata(m, 0, sizeof(ip6buf), &ip6buf); 1322 ip6 = &ip6buf; 1323 } 1324 1325 sin6 = (struct sockaddr_in6 *)&spidx->src; 1326 memset(sin6, 0, sizeof(*sin6)); 1327 sin6->sin6_family = AF_INET6; 1328 sin6->sin6_len = sizeof(struct sockaddr_in6); 1329 memcpy(&sin6->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); 1330 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 1331 sin6->sin6_addr.s6_addr16[1] = 0; 1332 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 1333 } 1334 spidx->prefs = sizeof(struct in6_addr) << 3; 1335 1336 sin6 = (struct sockaddr_in6 *)&spidx->dst; 1337 memset(sin6, 0, sizeof(*sin6)); 1338 sin6->sin6_family = AF_INET6; 1339 sin6->sin6_len = sizeof(struct sockaddr_in6); 1340 memcpy(&sin6->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); 1341 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1342 sin6->sin6_addr.s6_addr16[1] = 0; 1343 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 1344 } 1345 spidx->prefd = sizeof(struct in6_addr) << 3; 1346 1347 return 0; 1348 } 1349 #endif 1350 1351 static void 1352 ipsec_delpcbpolicy(struct inpcbpolicy *p) 1353 { 1354 free(p, M_SECA); 1355 } 1356 1357 /* initialize policy in PCB */ 1358 int 1359 ipsec_init_policy(struct socket *so, struct inpcbpolicy **policy) 1360 { 1361 struct inpcbpolicy *new; 1362 1363 /* sanity check. */ 1364 if (so == NULL || policy == NULL) 1365 panic("ipsec_init_policy: NULL pointer was passed"); 1366 1367 new = malloc(sizeof(*new), M_SECA, M_NOWAIT|M_ZERO); 1368 if (new == NULL) { 1369 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 1370 return ENOBUFS; 1371 } 1372 1373 if (IPSEC_PRIVILEGED_SO(so)) 1374 new->priv = 1; 1375 else 1376 new->priv = 0; 1377 1378 if ((new->sp_in = KEY_NEWSP()) == NULL) { 1379 ipsec_delpcbpolicy(new); 1380 return ENOBUFS; 1381 } 1382 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 1383 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 1384 1385 if ((new->sp_out = KEY_NEWSP()) == NULL) { 1386 KEY_FREESP(&new->sp_in); 1387 ipsec_delpcbpolicy(new); 1388 return ENOBUFS; 1389 } 1390 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 1391 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 1392 1393 *policy = new; 1394 1395 return 0; 1396 } 1397 1398 /* copy old ipsec policy into new */ 1399 int 1400 ipsec_copy_policy(const struct inpcbpolicy *old, struct inpcbpolicy *new) 1401 { 1402 struct secpolicy *sp; 1403 1404 sp = ipsec_deepcopy_policy(old->sp_in); 1405 if (sp) { 1406 KEY_FREESP(&new->sp_in); 1407 new->sp_in = sp; 1408 } else 1409 return ENOBUFS; 1410 1411 sp = ipsec_deepcopy_policy(old->sp_out); 1412 if (sp) { 1413 KEY_FREESP(&new->sp_out); 1414 new->sp_out = sp; 1415 } else 1416 return ENOBUFS; 1417 1418 new->priv = old->priv; 1419 1420 return 0; 1421 } 1422 1423 /* deep-copy a policy in PCB */ 1424 static struct secpolicy * 1425 ipsec_deepcopy_policy(const struct secpolicy *src) 1426 { 1427 struct ipsecrequest *newchain = NULL; 1428 const struct ipsecrequest *p; 1429 struct ipsecrequest **q; 1430 struct ipsecrequest *r; 1431 struct secpolicy *dst; 1432 1433 if (src == NULL) 1434 return NULL; 1435 dst = KEY_NEWSP(); 1436 if (dst == NULL) 1437 return NULL; 1438 1439 /* 1440 * deep-copy IPsec request chain. This is required since struct 1441 * ipsecrequest is not reference counted. 1442 */ 1443 q = &newchain; 1444 for (p = src->req; p; p = p->next) { 1445 *q = malloc(sizeof(**q), M_SECA, M_NOWAIT|M_ZERO); 1446 if (*q == NULL) 1447 goto fail; 1448 (*q)->next = NULL; 1449 1450 (*q)->saidx.proto = p->saidx.proto; 1451 (*q)->saidx.mode = p->saidx.mode; 1452 (*q)->level = p->level; 1453 (*q)->saidx.reqid = p->saidx.reqid; 1454 1455 memcpy(&(*q)->saidx.src, &p->saidx.src, sizeof((*q)->saidx.src)); 1456 memcpy(&(*q)->saidx.dst, &p->saidx.dst, sizeof((*q)->saidx.dst)); 1457 1458 (*q)->sav = NULL; 1459 (*q)->sp = dst; 1460 1461 q = &((*q)->next); 1462 } 1463 1464 dst->req = newchain; 1465 dst->state = src->state; 1466 dst->policy = src->policy; 1467 /* do not touch the refcnt fields */ 1468 1469 return dst; 1470 1471 fail: 1472 for (q = &newchain; *q; q = &r) { 1473 r = (*q)->next; 1474 free(*q, M_SECA); 1475 } 1476 return NULL; 1477 } 1478 1479 /* set policy and ipsec request if present. */ 1480 static int 1481 ipsec_set_policy( 1482 struct secpolicy **policy, 1483 int optname, 1484 const void *request, 1485 size_t len, 1486 kauth_cred_t cred 1487 ) 1488 { 1489 const struct sadb_x_policy *xpl; 1490 struct secpolicy *newsp = NULL; 1491 int error; 1492 1493 /* sanity check. */ 1494 if (policy == NULL || *policy == NULL || request == NULL) 1495 return EINVAL; 1496 if (len < sizeof(*xpl)) 1497 return EINVAL; 1498 xpl = (const struct sadb_x_policy *)request; 1499 1500 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1501 printf("ipsec_set_policy: passed policy\n"); 1502 kdebug_sadb_x_policy((const struct sadb_ext *)xpl)); 1503 1504 /* check policy type */ 1505 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1506 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1507 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1508 return EINVAL; 1509 1510 /* check privileged socket */ 1511 if (xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1512 error = kauth_authorize_network(cred, KAUTH_NETWORK_IPSEC, 1513 KAUTH_REQ_NETWORK_IPSEC_BYPASS, NULL, NULL, NULL); 1514 if (error) 1515 return (error); 1516 } 1517 1518 /* allocation new SP entry */ 1519 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1520 return error; 1521 1522 newsp->state = IPSEC_SPSTATE_ALIVE; 1523 1524 /* clear old SP and set new SP */ 1525 KEY_FREESP(policy); 1526 *policy = newsp; 1527 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1528 printf("ipsec_set_policy: new policy\n"); 1529 kdebug_secpolicy(newsp)); 1530 1531 return 0; 1532 } 1533 1534 static int 1535 ipsec_get_policy(struct secpolicy *policy, struct mbuf **mp) 1536 { 1537 1538 /* sanity check. */ 1539 if (policy == NULL || mp == NULL) 1540 return EINVAL; 1541 1542 *mp = key_sp2msg(policy); 1543 if (!*mp) { 1544 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1545 return ENOBUFS; 1546 } 1547 1548 (*mp)->m_type = MT_DATA; 1549 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1550 printf("ipsec_get_policy:\n"); 1551 kdebug_mbuf(*mp)); 1552 1553 return 0; 1554 } 1555 1556 int 1557 ipsec4_set_policy(struct inpcb *inp, int optname, const void *request, 1558 size_t len, kauth_cred_t cred) 1559 { 1560 const struct sadb_x_policy *xpl; 1561 struct secpolicy **policy; 1562 1563 /* sanity check. */ 1564 if (inp == NULL || request == NULL) 1565 return EINVAL; 1566 if (len < sizeof(*xpl)) 1567 return EINVAL; 1568 xpl = (const struct sadb_x_policy *)request; 1569 1570 IPSEC_ASSERT(inp->inp_sp != NULL, 1571 ("ipsec4_set_policy(): null inp->in_sp")); 1572 1573 /* select direction */ 1574 switch (xpl->sadb_x_policy_dir) { 1575 case IPSEC_DIR_INBOUND: 1576 policy = &inp->inp_sp->sp_in; 1577 break; 1578 case IPSEC_DIR_OUTBOUND: 1579 policy = &inp->inp_sp->sp_out; 1580 break; 1581 default: 1582 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1583 xpl->sadb_x_policy_dir)); 1584 return EINVAL; 1585 } 1586 1587 return ipsec_set_policy(policy, optname, request, len, cred); 1588 } 1589 1590 int 1591 ipsec4_get_policy(struct inpcb *inp, const void *request, size_t len, 1592 struct mbuf **mp) 1593 { 1594 const struct sadb_x_policy *xpl; 1595 struct secpolicy *policy; 1596 1597 /* sanity check. */ 1598 if (inp == NULL || request == NULL || mp == NULL) 1599 return EINVAL; 1600 IPSEC_ASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1601 if (len < sizeof(*xpl)) 1602 return EINVAL; 1603 xpl = (const struct sadb_x_policy *)request; 1604 1605 /* select direction */ 1606 switch (xpl->sadb_x_policy_dir) { 1607 case IPSEC_DIR_INBOUND: 1608 policy = inp->inp_sp->sp_in; 1609 break; 1610 case IPSEC_DIR_OUTBOUND: 1611 policy = inp->inp_sp->sp_out; 1612 break; 1613 default: 1614 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1615 xpl->sadb_x_policy_dir)); 1616 return EINVAL; 1617 } 1618 1619 return ipsec_get_policy(policy, mp); 1620 } 1621 1622 /* delete policy in PCB */ 1623 int 1624 ipsec4_delete_pcbpolicy(struct inpcb *inp) 1625 { 1626 IPSEC_ASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1627 1628 if (inp->inp_sp == NULL) 1629 return 0; 1630 1631 if (inp->inp_sp->sp_in != NULL) 1632 KEY_FREESP(&inp->inp_sp->sp_in); 1633 1634 if (inp->inp_sp->sp_out != NULL) 1635 KEY_FREESP(&inp->inp_sp->sp_out); 1636 1637 #ifdef __NetBSD__ 1638 ipsec_invalpcbcache(inp->inp_sp, IPSEC_DIR_ANY); 1639 #endif 1640 1641 ipsec_delpcbpolicy(inp->inp_sp); 1642 inp->inp_sp = NULL; 1643 1644 return 0; 1645 } 1646 1647 #ifdef INET6 1648 int 1649 ipsec6_set_policy(struct in6pcb *in6p, int optname, const void *request, 1650 size_t len, kauth_cred_t cred) 1651 { 1652 const struct sadb_x_policy *xpl; 1653 struct secpolicy **policy; 1654 1655 /* sanity check. */ 1656 if (in6p == NULL || request == NULL) 1657 return EINVAL; 1658 if (len < sizeof(*xpl)) 1659 return EINVAL; 1660 xpl = (const struct sadb_x_policy *)request; 1661 1662 /* select direction */ 1663 switch (xpl->sadb_x_policy_dir) { 1664 case IPSEC_DIR_INBOUND: 1665 policy = &in6p->in6p_sp->sp_in; 1666 break; 1667 case IPSEC_DIR_OUTBOUND: 1668 policy = &in6p->in6p_sp->sp_out; 1669 break; 1670 default: 1671 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1672 xpl->sadb_x_policy_dir)); 1673 return EINVAL; 1674 } 1675 1676 return ipsec_set_policy(policy, optname, request, len, cred); 1677 } 1678 1679 int 1680 ipsec6_get_policy(struct in6pcb *in6p, const void *request, size_t len, 1681 struct mbuf **mp) 1682 { 1683 const struct sadb_x_policy *xpl; 1684 struct secpolicy *policy; 1685 1686 /* sanity check. */ 1687 if (in6p == NULL || request == NULL || mp == NULL) 1688 return EINVAL; 1689 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1690 if (len < sizeof(*xpl)) 1691 return EINVAL; 1692 xpl = (const struct sadb_x_policy *)request; 1693 1694 /* select direction */ 1695 switch (xpl->sadb_x_policy_dir) { 1696 case IPSEC_DIR_INBOUND: 1697 policy = in6p->in6p_sp->sp_in; 1698 break; 1699 case IPSEC_DIR_OUTBOUND: 1700 policy = in6p->in6p_sp->sp_out; 1701 break; 1702 default: 1703 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1704 xpl->sadb_x_policy_dir)); 1705 return EINVAL; 1706 } 1707 1708 return ipsec_get_policy(policy, mp); 1709 } 1710 1711 int 1712 ipsec6_delete_pcbpolicy(struct in6pcb *in6p) 1713 { 1714 IPSEC_ASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1715 1716 if (in6p->in6p_sp == NULL) 1717 return 0; 1718 1719 if (in6p->in6p_sp->sp_in != NULL) 1720 KEY_FREESP(&in6p->in6p_sp->sp_in); 1721 1722 if (in6p->in6p_sp->sp_out != NULL) 1723 KEY_FREESP(&in6p->in6p_sp->sp_out); 1724 1725 #ifdef __NetBSD 1726 ipsec_invalpcbcache(in6p->in6p_sp, IPSEC_DIR_ANY); 1727 #endif 1728 1729 ipsec_delpcbpolicy(in6p->in6p_sp); 1730 in6p->in6p_sp = NULL; 1731 1732 return 0; 1733 } 1734 #endif 1735 1736 /* 1737 * return current level. 1738 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1739 */ 1740 u_int 1741 ipsec_get_reqlevel(const struct ipsecrequest *isr) 1742 { 1743 u_int level = 0; 1744 u_int esp_trans_deflev, esp_net_deflev; 1745 u_int ah_trans_deflev, ah_net_deflev; 1746 1747 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, 1748 ("ipsec_get_reqlevel: null argument")); 1749 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1750 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1751 isr->sp->spidx.src.sa.sa_family, 1752 isr->sp->spidx.dst.sa.sa_family)); 1753 1754 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1755 #define IPSEC_CHECK_DEFAULT(lev) \ 1756 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1757 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1758 ? (ipsec_debug \ 1759 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1760 (lev), IPSEC_LEVEL_REQUIRE) \ 1761 : 0), \ 1762 (lev) = IPSEC_LEVEL_REQUIRE, \ 1763 (lev) \ 1764 : (lev)) 1765 1766 /* set default level */ 1767 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1768 #ifdef INET 1769 case AF_INET: 1770 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1771 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1772 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1773 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1774 break; 1775 #endif 1776 #ifdef INET6 1777 case AF_INET6: 1778 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1779 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1780 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1781 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1782 break; 1783 #endif /* INET6 */ 1784 default: 1785 panic("key_get_reqlevel: unknown af %u", 1786 isr->sp->spidx.src.sa.sa_family); 1787 } 1788 1789 #undef IPSEC_CHECK_DEFAULT 1790 1791 /* set level */ 1792 switch (isr->level) { 1793 case IPSEC_LEVEL_DEFAULT: 1794 switch (isr->saidx.proto) { 1795 case IPPROTO_ESP: 1796 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1797 level = esp_net_deflev; 1798 else 1799 level = esp_trans_deflev; 1800 break; 1801 case IPPROTO_AH: 1802 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1803 level = ah_net_deflev; 1804 else 1805 level = ah_trans_deflev; 1806 break; 1807 case IPPROTO_IPCOMP: 1808 /* 1809 * we don't really care, as IPcomp document says that 1810 * we shouldn't compress small packets 1811 */ 1812 level = IPSEC_LEVEL_USE; 1813 break; 1814 default: 1815 panic("ipsec_get_reqlevel: Illegal protocol defined %u", 1816 isr->saidx.proto); 1817 } 1818 break; 1819 1820 case IPSEC_LEVEL_USE: 1821 case IPSEC_LEVEL_REQUIRE: 1822 level = isr->level; 1823 break; 1824 case IPSEC_LEVEL_UNIQUE: 1825 level = IPSEC_LEVEL_REQUIRE; 1826 break; 1827 1828 default: 1829 panic("ipsec_get_reqlevel: Illegal IPsec level %u", 1830 isr->level); 1831 } 1832 1833 return level; 1834 } 1835 1836 /* 1837 * Check security policy requirements against the actual 1838 * packet contents. Return one if the packet should be 1839 * reject as "invalid"; otherwiser return zero to have the 1840 * packet treated as "valid". 1841 * 1842 * OUT: 1843 * 0: valid 1844 * 1: invalid 1845 */ 1846 int 1847 ipsec_in_reject(const struct secpolicy *sp, const struct mbuf *m) 1848 { 1849 struct ipsecrequest *isr; 1850 int need_auth; 1851 1852 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1853 printf("ipsec_in_reject: using SP\n"); 1854 kdebug_secpolicy(sp)); 1855 1856 /* check policy */ 1857 switch (sp->policy) { 1858 case IPSEC_POLICY_DISCARD: 1859 return 1; 1860 case IPSEC_POLICY_BYPASS: 1861 case IPSEC_POLICY_NONE: 1862 return 0; 1863 } 1864 1865 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1866 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1867 1868 /* XXX should compare policy against ipsec header history */ 1869 1870 need_auth = 0; 1871 for (isr = sp->req; isr != NULL; isr = isr->next) { 1872 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1873 continue; 1874 switch (isr->saidx.proto) { 1875 case IPPROTO_ESP: 1876 if ((m->m_flags & M_DECRYPTED) == 0) { 1877 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1878 printf("ipsec_in_reject: ESP m_flags:%x\n", 1879 m->m_flags)); 1880 return 1; 1881 } 1882 1883 if (!need_auth && 1884 isr->sav != NULL && 1885 isr->sav->tdb_authalgxform != NULL && 1886 (m->m_flags & M_AUTHIPDGM) == 0) { 1887 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1888 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1889 m->m_flags)); 1890 return 1; 1891 } 1892 break; 1893 case IPPROTO_AH: 1894 need_auth = 1; 1895 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1896 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1897 printf("ipsec_in_reject: AH m_flags:%x\n", 1898 m->m_flags)); 1899 return 1; 1900 } 1901 break; 1902 case IPPROTO_IPCOMP: 1903 /* 1904 * we don't really care, as IPcomp document 1905 * says that we shouldn't compress small 1906 * packets, IPComp policy should always be 1907 * treated as being in "use" level. 1908 */ 1909 break; 1910 } 1911 } 1912 return 0; /* valid */ 1913 } 1914 1915 /* 1916 * Check AH/ESP integrity. 1917 * This function is called from tcp_input(), udp_input(), 1918 * and {ah,esp}4_input for tunnel mode 1919 */ 1920 int 1921 ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) 1922 { 1923 struct secpolicy *sp; 1924 int error; 1925 int result; 1926 1927 IPSEC_ASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1928 1929 /* get SP for this packet. 1930 * When we are called from ip_forward(), we call 1931 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1932 */ 1933 if (inp == NULL) 1934 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1935 else 1936 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1937 IN4PCB_TO_PCB(inp), &error); 1938 1939 if (sp != NULL) { 1940 result = ipsec_in_reject(sp, m); 1941 if (result) 1942 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1943 KEY_FREESP(&sp); 1944 } else { 1945 result = 0; /* XXX should be panic ? 1946 * -> No, there may be error. */ 1947 } 1948 return result; 1949 } 1950 1951 1952 #ifdef INET6 1953 /* 1954 * Check AH/ESP integrity. 1955 * This function is called from tcp6_input(), udp6_input(), 1956 * and {ah,esp}6_input for tunnel mode 1957 */ 1958 int 1959 ipsec6_in_reject(struct mbuf *m, struct in6pcb *in6p) 1960 { 1961 struct secpolicy *sp = NULL; 1962 int error; 1963 int result; 1964 1965 /* sanity check */ 1966 if (m == NULL) 1967 return 0; /* XXX should be panic ? */ 1968 1969 /* get SP for this packet. 1970 * When we are called from ip_forward(), we call 1971 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1972 */ 1973 if (in6p == NULL) 1974 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1975 else 1976 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, 1977 IN6PCB_TO_PCB(in6p), 1978 &error); 1979 1980 if (sp != NULL) { 1981 result = ipsec_in_reject(sp, m); 1982 if (result) 1983 IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); 1984 KEY_FREESP(&sp); 1985 } else { 1986 result = 0; 1987 } 1988 return result; 1989 } 1990 #endif 1991 1992 /* 1993 * compute the byte size to be occupied by IPsec header. 1994 * in case it is tunneled, it includes the size of outer IP header. 1995 * NOTE: SP passed is free in this function. 1996 */ 1997 static size_t 1998 ipsec_hdrsiz(const struct secpolicy *sp) 1999 { 2000 const struct ipsecrequest *isr; 2001 size_t siz; 2002 2003 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 2004 printf("ipsec_hdrsiz: using SP\n"); 2005 kdebug_secpolicy(sp)); 2006 2007 switch (sp->policy) { 2008 case IPSEC_POLICY_DISCARD: 2009 case IPSEC_POLICY_BYPASS: 2010 case IPSEC_POLICY_NONE: 2011 return 0; 2012 } 2013 2014 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2015 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 2016 2017 siz = 0; 2018 for (isr = sp->req; isr != NULL; isr = isr->next) { 2019 size_t clen = 0; 2020 2021 switch (isr->saidx.proto) { 2022 case IPPROTO_ESP: 2023 clen = esp_hdrsiz(isr->sav); 2024 break; 2025 case IPPROTO_AH: 2026 clen = ah_hdrsiz(isr->sav); 2027 break; 2028 case IPPROTO_IPCOMP: 2029 clen = sizeof(struct ipcomp); 2030 break; 2031 } 2032 2033 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 2034 switch (isr->saidx.dst.sa.sa_family) { 2035 case AF_INET: 2036 clen += sizeof(struct ip); 2037 break; 2038 #ifdef INET6 2039 case AF_INET6: 2040 clen += sizeof(struct ip6_hdr); 2041 break; 2042 #endif 2043 default: 2044 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 2045 "unknown AF %d in IPsec tunnel SA\n", 2046 ((const struct sockaddr *)&isr->saidx.dst)->sa_family)); 2047 break; 2048 } 2049 } 2050 siz += clen; 2051 } 2052 2053 return siz; 2054 } 2055 2056 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 2057 size_t 2058 ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 2059 { 2060 struct secpolicy *sp; 2061 int error; 2062 size_t size; 2063 2064 IPSEC_ASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 2065 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 2066 ("ipsec4_hdrsize: socket w/o inpcb")); 2067 2068 /* get SP for this packet. 2069 * When we are called from ip_forward(), we call 2070 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 2071 */ 2072 if (inp == NULL) 2073 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 2074 else 2075 sp = ipsec_getpolicybysock(m, dir, 2076 IN4PCB_TO_PCB(inp), &error); 2077 2078 if (sp != NULL) { 2079 size = ipsec_hdrsiz(sp); 2080 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 2081 printf("ipsec4_hdrsiz: size:%lu.\n", 2082 (unsigned long)size)); 2083 2084 KEY_FREESP(&sp); 2085 } else { 2086 size = 0; /* XXX should be panic ? */ 2087 } 2088 return size; 2089 } 2090 2091 #ifdef INET6 2092 /* This function is called from ipsec6_hdrsize_tcp(), 2093 * and maybe from ip6_forward.() 2094 */ 2095 size_t 2096 ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct in6pcb *in6p) 2097 { 2098 struct secpolicy *sp; 2099 int error; 2100 size_t size; 2101 2102 IPSEC_ASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 2103 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 2104 ("ipsec6_hdrsize: socket w/o inpcb")); 2105 2106 /* get SP for this packet */ 2107 /* XXX Is it right to call with IP_FORWARDING. */ 2108 if (in6p == NULL) 2109 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 2110 else 2111 sp = ipsec_getpolicybysock(m, dir, 2112 IN6PCB_TO_PCB(in6p), 2113 &error); 2114 2115 if (sp == NULL) 2116 return 0; 2117 size = ipsec_hdrsiz(sp); 2118 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 2119 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 2120 KEY_FREESP(&sp); 2121 2122 return size; 2123 } 2124 #endif /*INET6*/ 2125 2126 /* 2127 * Check the variable replay window. 2128 * ipsec_chkreplay() performs replay check before ICV verification. 2129 * ipsec_updatereplay() updates replay bitmap. This must be called after 2130 * ICV verification (it also performs replay check, which is usually done 2131 * beforehand). 2132 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 2133 * 2134 * based on RFC 2401. 2135 */ 2136 int 2137 ipsec_chkreplay(u_int32_t seq, const struct secasvar *sav) 2138 { 2139 const struct secreplay *replay; 2140 u_int32_t diff; 2141 int fr; 2142 u_int32_t wsizeb; /* constant: bits of window size */ 2143 int frlast; /* constant: last frame */ 2144 2145 IPSEC_SPLASSERT_SOFTNET("ipsec_chkreplay"); 2146 2147 IPSEC_ASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 2148 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 2149 2150 replay = sav->replay; 2151 2152 if (replay->wsize == 0) 2153 return 1; /* no need to check replay. */ 2154 2155 /* constant */ 2156 frlast = replay->wsize - 1; 2157 wsizeb = replay->wsize << 3; 2158 2159 /* sequence number of 0 is invalid */ 2160 if (seq == 0) 2161 return 0; 2162 2163 /* first time is always okay */ 2164 if (replay->count == 0) 2165 return 1; 2166 2167 if (seq > replay->lastseq) { 2168 /* larger sequences are okay */ 2169 return 1; 2170 } else { 2171 /* seq is equal or less than lastseq. */ 2172 diff = replay->lastseq - seq; 2173 2174 /* over range to check, i.e. too old or wrapped */ 2175 if (diff >= wsizeb) 2176 return 0; 2177 2178 fr = frlast - diff / 8; 2179 2180 /* this packet already seen ? */ 2181 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2182 return 0; 2183 2184 /* out of order but good */ 2185 return 1; 2186 } 2187 } 2188 2189 /* 2190 * check replay counter whether to update or not. 2191 * OUT: 0: OK 2192 * 1: NG 2193 */ 2194 int 2195 ipsec_updatereplay(u_int32_t seq, const struct secasvar *sav) 2196 { 2197 struct secreplay *replay; 2198 u_int32_t diff; 2199 int fr; 2200 u_int32_t wsizeb; /* constant: bits of window size */ 2201 int frlast; /* constant: last frame */ 2202 2203 IPSEC_SPLASSERT_SOFTNET("ipsec_updatereplay"); 2204 2205 IPSEC_ASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 2206 IPSEC_ASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 2207 2208 replay = sav->replay; 2209 2210 if (replay->wsize == 0) 2211 goto ok; /* no need to check replay. */ 2212 2213 /* constant */ 2214 frlast = replay->wsize - 1; 2215 wsizeb = replay->wsize << 3; 2216 2217 /* sequence number of 0 is invalid */ 2218 if (seq == 0) 2219 return 1; 2220 2221 /* first time */ 2222 if (replay->count == 0) { 2223 replay->lastseq = seq; 2224 memset(replay->bitmap, 0, replay->wsize); 2225 (replay->bitmap)[frlast] = 1; 2226 goto ok; 2227 } 2228 2229 if (seq > replay->lastseq) { 2230 /* seq is larger than lastseq. */ 2231 diff = seq - replay->lastseq; 2232 2233 /* new larger sequence number */ 2234 if (diff < wsizeb) { 2235 /* In window */ 2236 /* set bit for this packet */ 2237 vshiftl(replay->bitmap, diff, replay->wsize); 2238 (replay->bitmap)[frlast] |= 1; 2239 } else { 2240 /* this packet has a "way larger" */ 2241 memset(replay->bitmap, 0, replay->wsize); 2242 (replay->bitmap)[frlast] = 1; 2243 } 2244 replay->lastseq = seq; 2245 2246 /* larger is good */ 2247 } else { 2248 /* seq is equal or less than lastseq. */ 2249 diff = replay->lastseq - seq; 2250 2251 /* over range to check, i.e. too old or wrapped */ 2252 if (diff >= wsizeb) 2253 return 1; 2254 2255 fr = frlast - diff / 8; 2256 2257 /* this packet already seen ? */ 2258 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 2259 return 1; 2260 2261 /* mark as seen */ 2262 (replay->bitmap)[fr] |= (1 << (diff % 8)); 2263 2264 /* out of order but good */ 2265 } 2266 2267 ok: 2268 if (replay->count == ~0) { 2269 2270 /* set overflow flag */ 2271 replay->overflow++; 2272 2273 /* don't increment, no more packets accepted */ 2274 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 2275 return 1; 2276 2277 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 2278 replay->overflow, ipsec_logsastr(sav))); 2279 } 2280 2281 replay->count++; 2282 2283 return 0; 2284 } 2285 2286 /* 2287 * shift variable length bunffer to left. 2288 * IN: bitmap: pointer to the buffer 2289 * nbit: the number of to shift. 2290 * wsize: buffer size (bytes). 2291 */ 2292 static void 2293 vshiftl(unsigned char *bitmap, int nbit, int wsize) 2294 { 2295 int s, j, i; 2296 unsigned char over; 2297 2298 for (j = 0; j < nbit; j += 8) { 2299 s = (nbit - j < 8) ? (nbit - j): 8; 2300 bitmap[0] <<= s; 2301 for (i = 1; i < wsize; i++) { 2302 over = (bitmap[i] >> (8 - s)); 2303 bitmap[i] <<= s; 2304 bitmap[i-1] |= over; 2305 } 2306 } 2307 2308 return; 2309 } 2310 2311 /* Return a printable string for the IPv4 address. */ 2312 static char * 2313 inet_ntoa4(struct in_addr ina) 2314 { 2315 static char buf[4][4 * sizeof "123" + 4]; 2316 unsigned char *ucp = (unsigned char *) &ina; 2317 static int i = 3; 2318 2319 i = (i + 1) % 4; 2320 snprintf(buf[i], sizeof(buf[i]), "%d.%d.%d.%d", 2321 ucp[0] & 0xff, ucp[1] & 0xff, ucp[2] & 0xff, ucp[3] & 0xff); 2322 return (buf[i]); 2323 } 2324 2325 /* Return a printable string for the address. */ 2326 const char * 2327 ipsec_address(const union sockaddr_union *sa) 2328 { 2329 switch (sa->sa.sa_family) { 2330 #if INET 2331 case AF_INET: 2332 return inet_ntoa4(sa->sin.sin_addr); 2333 #endif /* INET */ 2334 2335 #if INET6 2336 case AF_INET6: 2337 return ip6_sprintf(&sa->sin6.sin6_addr); 2338 #endif /* INET6 */ 2339 2340 default: 2341 return "(unknown address family)"; 2342 } 2343 } 2344 2345 const char * 2346 ipsec_logsastr(const struct secasvar *sav) 2347 { 2348 static char buf[256]; 2349 char *p; 2350 const struct secasindex *saidx = &sav->sah->saidx; 2351 2352 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 2353 ("ipsec_logsastr: address family mismatch")); 2354 2355 p = buf; 2356 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 2357 while (p && *p) 2358 p++; 2359 /* NB: only use ipsec_address on one address at a time */ 2360 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 2361 ipsec_address(&saidx->src)); 2362 while (p && *p) 2363 p++; 2364 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 2365 ipsec_address(&saidx->dst)); 2366 2367 return buf; 2368 } 2369 2370 void 2371 ipsec_dumpmbuf(struct mbuf *m) 2372 { 2373 int totlen; 2374 int i; 2375 u_char *p; 2376 2377 totlen = 0; 2378 printf("---\n"); 2379 while (m) { 2380 p = mtod(m, u_char *); 2381 for (i = 0; i < m->m_len; i++) { 2382 printf("%02x ", p[i]); 2383 totlen++; 2384 if (totlen % 16 == 0) 2385 printf("\n"); 2386 } 2387 m = m->m_next; 2388 } 2389 if (totlen % 16 != 0) 2390 printf("\n"); 2391 printf("---\n"); 2392 } 2393 2394 #ifdef INET6 2395 struct secpolicy * 2396 ipsec6_check_policy(struct mbuf *m, const struct socket *so, 2397 int flags, int *needipsecp, int *errorp) 2398 { 2399 struct in6pcb *in6p = NULL; 2400 struct secpolicy *sp = NULL; 2401 int s; 2402 int error = 0; 2403 int needipsec = 0; 2404 2405 if (so != NULL && so->so_proto->pr_domain->dom_family == AF_INET6) 2406 in6p = sotoin6pcb(so); 2407 2408 if (!ipsec_outdone(m)) { 2409 s = splsoftnet(); 2410 if (in6p != NULL && 2411 IPSEC_PCB_SKIP_IPSEC(in6p->in6p_sp, IPSEC_DIR_OUTBOUND)) { 2412 splx(s); 2413 goto skippolicycheck; 2414 } 2415 sp = ipsec6_checkpolicy(m, IPSEC_DIR_OUTBOUND, flags, &error,in6p); 2416 2417 /* 2418 * There are four return cases: 2419 * sp != NULL apply IPsec policy 2420 * sp == NULL, error == 0 no IPsec handling needed 2421 * sp == NULL, error == -EINVAL discard packet w/o error 2422 * sp == NULL, error != 0 discard packet, report error 2423 */ 2424 2425 splx(s); 2426 if (sp == NULL) { 2427 /* 2428 * Caller must check the error return to see if it needs to discard 2429 * the packet. 2430 */ 2431 needipsec = 0; 2432 } else { 2433 needipsec = 1; 2434 } 2435 } 2436 skippolicycheck:; 2437 2438 *errorp = error; 2439 *needipsecp = needipsec; 2440 return sp; 2441 } 2442 #endif 2443 2444 2445 2446 /* XXX this stuff doesn't belong here... */ 2447 2448 static struct xformsw *xforms = NULL; 2449 2450 /* 2451 * Register a transform; typically at system startup. 2452 */ 2453 void 2454 xform_register(struct xformsw *xsp) 2455 { 2456 xsp->xf_next = xforms; 2457 xforms = xsp; 2458 } 2459 2460 /* 2461 * Initialize transform support in an sav. 2462 */ 2463 int 2464 xform_init(struct secasvar *sav, int xftype) 2465 { 2466 struct xformsw *xsp; 2467 2468 if (sav->tdb_xform != NULL) /* previously initialized */ 2469 return 0; 2470 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2471 if (xsp->xf_type == xftype) 2472 return (*xsp->xf_init)(sav, xsp); 2473 2474 DPRINTF(("xform_init: no match for xform type %d\n", xftype)); 2475 return EINVAL; 2476 } 2477 2478 void 2479 nat_t_ports_get(struct mbuf *m, u_int16_t *dport, u_int16_t *sport) { 2480 struct m_tag *tag; 2481 2482 if ((tag = m_tag_find(m, PACKET_TAG_IPSEC_NAT_T_PORTS, NULL))) { 2483 *sport = ((u_int16_t *)(tag + 1))[0]; 2484 *dport = ((u_int16_t *)(tag + 1))[1]; 2485 } else 2486 *sport = *dport = 0; 2487 } 2488 2489 #ifdef __NetBSD__ 2490 /* 2491 * XXXJRT This should be done as a protosw init call. 2492 */ 2493 void 2494 ipsec_attach(void) 2495 { 2496 2497 ipsecstat_percpu = percpu_alloc(sizeof(uint64_t) * IPSEC_NSTATS); 2498 2499 ah_attach(); 2500 esp_attach(); 2501 ipcomp_attach(); 2502 ipe4_attach(); 2503 #ifdef TCP_SIGNATURE 2504 tcpsignature_attach(); 2505 #endif 2506 } 2507 #endif /* __NetBSD__ */ 2508