1 /* $FreeBSD$ */ 2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * IPsec controller part. 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/priv.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/proc.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/in_var.h> 65 #include <netinet/udp.h> 66 #include <netinet/udp_var.h> 67 #include <netinet/tcp.h> 68 #include <netinet/udp.h> 69 70 #include <netinet/ip6.h> 71 #ifdef INET6 72 #include <netinet6/ip6_var.h> 73 #endif 74 #include <netinet/in_pcb.h> 75 #ifdef INET6 76 #include <netinet/icmp6.h> 77 #endif 78 79 #include <sys/types.h> 80 #include <netipsec/ipsec.h> 81 #ifdef INET6 82 #include <netipsec/ipsec6.h> 83 #endif 84 #include <netipsec/ah_var.h> 85 #include <netipsec/esp_var.h> 86 #include <netipsec/ipcomp.h> /*XXX*/ 87 #include <netipsec/ipcomp_var.h> 88 89 #include <netipsec/key.h> 90 #include <netipsec/keydb.h> 91 #include <netipsec/key_debug.h> 92 93 #include <netipsec/xform.h> 94 95 #include <machine/in_cksum.h> 96 97 #include <opencrypto/cryptodev.h> 98 99 #ifdef IPSEC_DEBUG 100 int ipsec_debug = 1; 101 #else 102 int ipsec_debug = 0; 103 #endif 104 105 /* NB: name changed so netstat doesn't use it */ 106 struct ipsecstat ipsec4stat; 107 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 108 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 109 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 110 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 111 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 112 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 113 struct secpolicy ip4_def_policy; 114 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 115 int ip4_esp_randpad = -1; 116 /* 117 * Crypto support requirements: 118 * 119 * 1 require hardware support 120 * -1 require software support 121 * 0 take anything 122 */ 123 int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 124 125 SYSCTL_DECL(_net_inet_ipsec); 126 127 /* net.inet.ipsec */ 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 129 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, 130 "IPsec default policy."); 131 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 132 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, "Default ESP transport mode level"); 133 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 134 CTLFLAG_RW, &ip4_esp_net_deflev, 0, "Default ESP tunnel mode level."); 135 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 136 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, "AH transfer mode default level."); 137 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 138 CTLFLAG_RW, &ip4_ah_net_deflev, 0, "AH tunnel mode default level."); 139 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 140 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, 141 "If set clear type-of-service field when doing AH computation."); 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 143 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, 144 "If not set clear offset field mask when doing AH computation."); 145 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 146 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, "Do not fragment bit on encap."); 147 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 148 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, 149 "Explicit Congestion Notification handling."); 150 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 151 debug, CTLFLAG_RW, &ipsec_debug, 0, 152 "Enable IPsec debugging output when set."); 153 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 154 crypto_support, CTLFLAG_RW, &crypto_support, 0, 155 "Crypto driver selection."); 156 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 157 ipsecstats, CTLFLAG_RD, &ipsec4stat, ipsecstat, "IPsec IPv4 statistics."); 158 159 #ifdef REGRESSION 160 /* 161 * When set to 1, IPsec will send packets with the same sequence number. 162 * This allows to verify if the other side has proper replay attacks detection. 163 */ 164 int ipsec_replay = 0; 165 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 166 "Emulate replay attack"); 167 /* 168 * When set 1, IPsec will send packets with corrupted HMAC. 169 * This allows to verify if the other side properly detects modified packets. 170 */ 171 int ipsec_integrity = 0; 172 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 173 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 174 #endif 175 176 #ifdef INET6 177 struct ipsecstat ipsec6stat; 178 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 179 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 180 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 181 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 182 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 183 184 SYSCTL_DECL(_net_inet6_ipsec6); 185 186 /* net.inet6.ipsec6 */ 187 #ifdef COMPAT_KAME 188 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 189 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics."); 190 #endif /* COMPAT_KAME */ 191 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 192 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, "IPsec default policy."); 193 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 194 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, "Default ESP transport mode level."); 195 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 196 CTLFLAG_RW, &ip6_esp_net_deflev, 0, "Default ESP tunnel mode level."); 197 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 198 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, "AH transfer mode default level."); 199 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 200 CTLFLAG_RW, &ip6_ah_net_deflev, 0, "AH tunnel mode default level."); 201 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 202 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, 203 "Explicit Congestion Notification handling."); 204 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 205 debug, CTLFLAG_RW, &ipsec_debug, 0, 206 "Enable IPsec debugging output when set."); 207 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS, 208 ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, "IPsec IPv6 statistics."); 209 #endif /* INET6 */ 210 211 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 212 #ifdef INET6 213 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 214 #endif 215 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 216 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 217 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 218 #ifdef INET6 219 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 220 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 221 #endif 222 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 223 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 224 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 225 int optname, caddr_t request, size_t len, struct ucred *cred)); 226 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 227 static void vshiftl __P((unsigned char *, int, int)); 228 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 229 230 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 231 232 /* 233 * Return a held reference to the default SP. 234 */ 235 static struct secpolicy * 236 key_allocsp_default(const char* where, int tag) 237 { 238 struct secpolicy *sp; 239 240 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 241 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 242 243 sp = &ip4_def_policy; 244 if (sp->policy != IPSEC_POLICY_DISCARD && 245 sp->policy != IPSEC_POLICY_NONE) { 246 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 247 sp->policy, IPSEC_POLICY_NONE)); 248 sp->policy = IPSEC_POLICY_NONE; 249 } 250 key_addref(sp); 251 252 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 253 printf("DP key_allocsp_default returns SP:%p (%u)\n", 254 sp, sp->refcnt)); 255 return sp; 256 } 257 #define KEY_ALLOCSP_DEFAULT() \ 258 key_allocsp_default(__FILE__, __LINE__) 259 260 /* 261 * For OUTBOUND packet having a socket. Searching SPD for packet, 262 * and return a pointer to SP. 263 * OUT: NULL: no apropreate SP found, the following value is set to error. 264 * 0 : bypass 265 * EACCES : discard packet. 266 * ENOENT : ipsec_acquire() in progress, maybe. 267 * others : error occured. 268 * others: a pointer to SP 269 * 270 * NOTE: IPv6 mapped adddress concern is implemented here. 271 */ 272 struct secpolicy * 273 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 274 { 275 struct secpolicy *sp; 276 277 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 278 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 279 ("invalid direction %u", dir)); 280 281 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 282 if (sp == NULL) /*XXX????*/ 283 sp = KEY_ALLOCSP_DEFAULT(); 284 IPSEC_ASSERT(sp != NULL, ("null SP")); 285 return sp; 286 } 287 288 /* 289 * For OUTBOUND packet having a socket. Searching SPD for packet, 290 * and return a pointer to SP. 291 * OUT: NULL: no apropreate SP found, the following value is set to error. 292 * 0 : bypass 293 * EACCES : discard packet. 294 * ENOENT : ipsec_acquire() in progress, maybe. 295 * others : error occured. 296 * others: a pointer to SP 297 * 298 * NOTE: IPv6 mapped adddress concern is implemented here. 299 */ 300 struct secpolicy * 301 ipsec_getpolicybysock(m, dir, inp, error) 302 struct mbuf *m; 303 u_int dir; 304 struct inpcb *inp; 305 int *error; 306 { 307 struct inpcbpolicy *pcbsp = NULL; 308 struct secpolicy *currsp = NULL; /* policy on socket */ 309 struct secpolicy *sp; 310 311 IPSEC_ASSERT(m != NULL, ("null mbuf")); 312 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 313 IPSEC_ASSERT(error != NULL, ("null error")); 314 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 315 ("invalid direction %u", dir)); 316 317 /* set spidx in pcb */ 318 if (inp->inp_vflag & INP_IPV6PROTO) { 319 #ifdef INET6 320 *error = ipsec6_setspidx_in6pcb(m, inp); 321 pcbsp = inp->in6p_sp; 322 #else 323 *error = EINVAL; /* should not happen */ 324 #endif 325 } else { 326 *error = ipsec4_setspidx_inpcb(m, inp); 327 pcbsp = inp->inp_sp; 328 } 329 if (*error) 330 return NULL; 331 332 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 333 switch (dir) { 334 case IPSEC_DIR_INBOUND: 335 currsp = pcbsp->sp_in; 336 break; 337 case IPSEC_DIR_OUTBOUND: 338 currsp = pcbsp->sp_out; 339 break; 340 } 341 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 342 343 if (pcbsp->priv) { /* when privilieged socket */ 344 switch (currsp->policy) { 345 case IPSEC_POLICY_BYPASS: 346 case IPSEC_POLICY_IPSEC: 347 key_addref(currsp); 348 sp = currsp; 349 break; 350 351 case IPSEC_POLICY_ENTRUST: 352 /* look for a policy in SPD */ 353 sp = KEY_ALLOCSP(&currsp->spidx, dir); 354 if (sp == NULL) /* no SP found */ 355 sp = KEY_ALLOCSP_DEFAULT(); 356 break; 357 358 default: 359 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 360 __func__, currsp->policy)); 361 *error = EINVAL; 362 return NULL; 363 } 364 } else { /* unpriv, SPD has policy */ 365 sp = KEY_ALLOCSP(&currsp->spidx, dir); 366 if (sp == NULL) { /* no SP found */ 367 switch (currsp->policy) { 368 case IPSEC_POLICY_BYPASS: 369 ipseclog((LOG_ERR, "%s: Illegal policy for " 370 "non-priviliged defined %d\n", 371 __func__, currsp->policy)); 372 *error = EINVAL; 373 return NULL; 374 375 case IPSEC_POLICY_ENTRUST: 376 sp = KEY_ALLOCSP_DEFAULT(); 377 break; 378 379 case IPSEC_POLICY_IPSEC: 380 key_addref(currsp); 381 sp = currsp; 382 break; 383 384 default: 385 ipseclog((LOG_ERR, "%s: Invalid policy for " 386 "PCB %d\n", __func__, currsp->policy)); 387 *error = EINVAL; 388 return NULL; 389 } 390 } 391 } 392 IPSEC_ASSERT(sp != NULL, 393 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 394 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 395 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 396 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 397 return sp; 398 } 399 400 /* 401 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 402 * and return a pointer to SP. 403 * OUT: positive: a pointer to the entry for security policy leaf matched. 404 * NULL: no apropreate SP found, the following value is set to error. 405 * 0 : bypass 406 * EACCES : discard packet. 407 * ENOENT : ipsec_acquire() in progress, maybe. 408 * others : error occured. 409 */ 410 struct secpolicy * 411 ipsec_getpolicybyaddr(m, dir, flag, error) 412 struct mbuf *m; 413 u_int dir; 414 int flag; 415 int *error; 416 { 417 struct secpolicyindex spidx; 418 struct secpolicy *sp; 419 420 IPSEC_ASSERT(m != NULL, ("null mbuf")); 421 IPSEC_ASSERT(error != NULL, ("null error")); 422 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 423 ("invalid direction %u", dir)); 424 425 sp = NULL; 426 if (key_havesp(dir)) { 427 /* Make an index to look for a policy. */ 428 *error = ipsec_setspidx(m, &spidx, 429 (flag & IP_FORWARDING) ? 0 : 1); 430 if (*error != 0) { 431 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 432 __func__, dir, flag)); 433 return NULL; 434 } 435 spidx.dir = dir; 436 437 sp = KEY_ALLOCSP(&spidx, dir); 438 } 439 if (sp == NULL) /* no SP found, use system default */ 440 sp = KEY_ALLOCSP_DEFAULT(); 441 IPSEC_ASSERT(sp != NULL, ("null SP")); 442 return sp; 443 } 444 445 struct secpolicy * 446 ipsec4_checkpolicy(m, dir, flag, error, inp) 447 struct mbuf *m; 448 u_int dir, flag; 449 int *error; 450 struct inpcb *inp; 451 { 452 struct secpolicy *sp; 453 454 *error = 0; 455 if (inp == NULL) 456 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 457 else 458 sp = ipsec_getpolicybysock(m, dir, inp, error); 459 if (sp == NULL) { 460 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 461 ipsec4stat.ips_out_inval++; 462 return NULL; 463 } 464 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 465 switch (sp->policy) { 466 case IPSEC_POLICY_ENTRUST: 467 default: 468 printf("%s: invalid policy %u\n", __func__, sp->policy); 469 /* fall thru... */ 470 case IPSEC_POLICY_DISCARD: 471 ipsec4stat.ips_out_polvio++; 472 *error = -EINVAL; /* packet is discarded by caller */ 473 break; 474 case IPSEC_POLICY_BYPASS: 475 case IPSEC_POLICY_NONE: 476 KEY_FREESP(&sp); 477 sp = NULL; /* NB: force NULL result */ 478 break; 479 case IPSEC_POLICY_IPSEC: 480 if (sp->req == NULL) /* acquire an SA */ 481 *error = key_spdacquire(sp); 482 break; 483 } 484 if (*error != 0) { 485 KEY_FREESP(&sp); 486 sp = NULL; 487 } 488 return sp; 489 } 490 491 static int 492 ipsec4_setspidx_inpcb(m, pcb) 493 struct mbuf *m; 494 struct inpcb *pcb; 495 { 496 int error; 497 498 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 499 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 500 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 501 ("null sp_in || sp_out")); 502 503 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 504 if (error == 0) { 505 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 506 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 507 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 508 } else { 509 bzero(&pcb->inp_sp->sp_in->spidx, 510 sizeof (pcb->inp_sp->sp_in->spidx)); 511 bzero(&pcb->inp_sp->sp_out->spidx, 512 sizeof (pcb->inp_sp->sp_in->spidx)); 513 } 514 return error; 515 } 516 517 #ifdef INET6 518 static int 519 ipsec6_setspidx_in6pcb(m, pcb) 520 struct mbuf *m; 521 struct in6pcb *pcb; 522 { 523 struct secpolicyindex *spidx; 524 int error; 525 526 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 527 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 528 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 529 ("null sp_in || sp_out")); 530 531 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 532 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 533 534 spidx = &pcb->in6p_sp->sp_in->spidx; 535 error = ipsec_setspidx(m, spidx, 1); 536 if (error) 537 goto bad; 538 spidx->dir = IPSEC_DIR_INBOUND; 539 540 spidx = &pcb->in6p_sp->sp_out->spidx; 541 error = ipsec_setspidx(m, spidx, 1); 542 if (error) 543 goto bad; 544 spidx->dir = IPSEC_DIR_OUTBOUND; 545 546 return 0; 547 548 bad: 549 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 550 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 551 return error; 552 } 553 #endif 554 555 /* 556 * configure security policy index (src/dst/proto/sport/dport) 557 * by looking at the content of mbuf. 558 * the caller is responsible for error recovery (like clearing up spidx). 559 */ 560 static int 561 ipsec_setspidx(m, spidx, needport) 562 struct mbuf *m; 563 struct secpolicyindex *spidx; 564 int needport; 565 { 566 struct ip *ip = NULL; 567 struct ip ipbuf; 568 u_int v; 569 struct mbuf *n; 570 int len; 571 int error; 572 573 IPSEC_ASSERT(m != NULL, ("null mbuf")); 574 575 /* 576 * validate m->m_pkthdr.len. we see incorrect length if we 577 * mistakenly call this function with inconsistent mbuf chain 578 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 579 */ 580 len = 0; 581 for (n = m; n; n = n->m_next) 582 len += n->m_len; 583 if (m->m_pkthdr.len != len) { 584 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 585 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 586 __func__, len, m->m_pkthdr.len)); 587 return EINVAL; 588 } 589 590 if (m->m_pkthdr.len < sizeof(struct ip)) { 591 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 592 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 593 __func__, m->m_pkthdr.len)); 594 return EINVAL; 595 } 596 597 if (m->m_len >= sizeof(*ip)) 598 ip = mtod(m, struct ip *); 599 else { 600 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 601 ip = &ipbuf; 602 } 603 #ifdef _IP_VHL 604 v = _IP_VHL_V(ip->ip_vhl); 605 #else 606 v = ip->ip_v; 607 #endif 608 switch (v) { 609 case 4: 610 error = ipsec4_setspidx_ipaddr(m, spidx); 611 if (error) 612 return error; 613 ipsec4_get_ulp(m, spidx, needport); 614 return 0; 615 #ifdef INET6 616 case 6: 617 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 618 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 619 printf("%s: pkthdr len(%d) too small (v6), " 620 "ignored\n", __func__, m->m_pkthdr.len)); 621 return EINVAL; 622 } 623 error = ipsec6_setspidx_ipaddr(m, spidx); 624 if (error) 625 return error; 626 ipsec6_get_ulp(m, spidx, needport); 627 return 0; 628 #endif 629 default: 630 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 631 printf("%s: " "unknown IP version %u, ignored.\n", 632 __func__, v)); 633 return EINVAL; 634 } 635 } 636 637 static void 638 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 639 { 640 u_int8_t nxt; 641 int off; 642 643 /* sanity check */ 644 IPSEC_ASSERT(m != NULL, ("null mbuf")); 645 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 646 647 /* NB: ip_input() flips it into host endian XXX need more checking */ 648 if (m->m_len < sizeof (struct ip)) { 649 struct ip *ip = mtod(m, struct ip *); 650 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 651 goto done; 652 #ifdef _IP_VHL 653 off = _IP_VHL_HL(ip->ip_vhl) << 2; 654 #else 655 off = ip->ip_hl << 2; 656 #endif 657 nxt = ip->ip_p; 658 } else { 659 struct ip ih; 660 661 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 662 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 663 goto done; 664 #ifdef _IP_VHL 665 off = _IP_VHL_HL(ih.ip_vhl) << 2; 666 #else 667 off = ih.ip_hl << 2; 668 #endif 669 nxt = ih.ip_p; 670 } 671 672 while (off < m->m_pkthdr.len) { 673 struct ip6_ext ip6e; 674 struct tcphdr th; 675 struct udphdr uh; 676 677 switch (nxt) { 678 case IPPROTO_TCP: 679 spidx->ul_proto = nxt; 680 if (!needport) 681 goto done_proto; 682 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 683 goto done; 684 m_copydata(m, off, sizeof (th), (caddr_t) &th); 685 spidx->src.sin.sin_port = th.th_sport; 686 spidx->dst.sin.sin_port = th.th_dport; 687 return; 688 case IPPROTO_UDP: 689 spidx->ul_proto = nxt; 690 if (!needport) 691 goto done_proto; 692 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 693 goto done; 694 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 695 spidx->src.sin.sin_port = uh.uh_sport; 696 spidx->dst.sin.sin_port = uh.uh_dport; 697 return; 698 case IPPROTO_AH: 699 if (off + sizeof(ip6e) > m->m_pkthdr.len) 700 goto done; 701 /* XXX sigh, this works but is totally bogus */ 702 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 703 off += (ip6e.ip6e_len + 2) << 2; 704 nxt = ip6e.ip6e_nxt; 705 break; 706 case IPPROTO_ICMP: 707 default: 708 /* XXX intermediate headers??? */ 709 spidx->ul_proto = nxt; 710 goto done_proto; 711 } 712 } 713 done: 714 spidx->ul_proto = IPSEC_ULPROTO_ANY; 715 done_proto: 716 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 717 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 718 } 719 720 /* assumes that m is sane */ 721 static int 722 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 723 { 724 static const struct sockaddr_in template = { 725 sizeof (struct sockaddr_in), 726 AF_INET, 727 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 728 }; 729 730 spidx->src.sin = template; 731 spidx->dst.sin = template; 732 733 if (m->m_len < sizeof (struct ip)) { 734 m_copydata(m, offsetof(struct ip, ip_src), 735 sizeof (struct in_addr), 736 (caddr_t) &spidx->src.sin.sin_addr); 737 m_copydata(m, offsetof(struct ip, ip_dst), 738 sizeof (struct in_addr), 739 (caddr_t) &spidx->dst.sin.sin_addr); 740 } else { 741 struct ip *ip = mtod(m, struct ip *); 742 spidx->src.sin.sin_addr = ip->ip_src; 743 spidx->dst.sin.sin_addr = ip->ip_dst; 744 } 745 746 spidx->prefs = sizeof(struct in_addr) << 3; 747 spidx->prefd = sizeof(struct in_addr) << 3; 748 749 return 0; 750 } 751 752 #ifdef INET6 753 static void 754 ipsec6_get_ulp(m, spidx, needport) 755 struct mbuf *m; 756 struct secpolicyindex *spidx; 757 int needport; 758 { 759 int off, nxt; 760 struct tcphdr th; 761 struct udphdr uh; 762 struct icmp6_hdr ih; 763 764 /* sanity check */ 765 if (m == NULL) 766 panic("%s: NULL pointer was passed.\n", __func__); 767 768 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 769 printf("%s:\n", __func__); kdebug_mbuf(m)); 770 771 /* set default */ 772 spidx->ul_proto = IPSEC_ULPROTO_ANY; 773 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 774 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 775 776 nxt = -1; 777 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 778 if (off < 0 || m->m_pkthdr.len < off) 779 return; 780 781 switch (nxt) { 782 case IPPROTO_TCP: 783 spidx->ul_proto = nxt; 784 if (!needport) 785 break; 786 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 787 break; 788 m_copydata(m, off, sizeof(th), (caddr_t)&th); 789 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 790 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 791 break; 792 case IPPROTO_UDP: 793 spidx->ul_proto = nxt; 794 if (!needport) 795 break; 796 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 797 break; 798 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 799 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 800 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 801 break; 802 case IPPROTO_ICMPV6: 803 spidx->ul_proto = nxt; 804 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 805 break; 806 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 807 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 808 htons((uint16_t)ih.icmp6_type); 809 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 810 htons((uint16_t)ih.icmp6_code); 811 break; 812 default: 813 /* XXX intermediate headers??? */ 814 spidx->ul_proto = nxt; 815 break; 816 } 817 } 818 819 /* assumes that m is sane */ 820 static int 821 ipsec6_setspidx_ipaddr(m, spidx) 822 struct mbuf *m; 823 struct secpolicyindex *spidx; 824 { 825 struct ip6_hdr *ip6 = NULL; 826 struct ip6_hdr ip6buf; 827 struct sockaddr_in6 *sin6; 828 829 if (m->m_len >= sizeof(*ip6)) 830 ip6 = mtod(m, struct ip6_hdr *); 831 else { 832 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 833 ip6 = &ip6buf; 834 } 835 836 sin6 = (struct sockaddr_in6 *)&spidx->src; 837 bzero(sin6, sizeof(*sin6)); 838 sin6->sin6_family = AF_INET6; 839 sin6->sin6_len = sizeof(struct sockaddr_in6); 840 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 841 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 842 sin6->sin6_addr.s6_addr16[1] = 0; 843 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 844 } 845 spidx->prefs = sizeof(struct in6_addr) << 3; 846 847 sin6 = (struct sockaddr_in6 *)&spidx->dst; 848 bzero(sin6, sizeof(*sin6)); 849 sin6->sin6_family = AF_INET6; 850 sin6->sin6_len = sizeof(struct sockaddr_in6); 851 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 852 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 853 sin6->sin6_addr.s6_addr16[1] = 0; 854 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 855 } 856 spidx->prefd = sizeof(struct in6_addr) << 3; 857 858 return 0; 859 } 860 #endif 861 862 static void 863 ipsec_delpcbpolicy(p) 864 struct inpcbpolicy *p; 865 { 866 free(p, M_IPSEC_INPCB); 867 } 868 869 /* initialize policy in PCB */ 870 int 871 ipsec_init_policy(so, pcb_sp) 872 struct socket *so; 873 struct inpcbpolicy **pcb_sp; 874 { 875 struct inpcbpolicy *new; 876 877 /* sanity check. */ 878 if (so == NULL || pcb_sp == NULL) 879 panic("%s: NULL pointer was passed.\n", __func__); 880 881 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 882 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 883 if (new == NULL) { 884 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 885 return ENOBUFS; 886 } 887 888 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 889 890 if ((new->sp_in = KEY_NEWSP()) == NULL) { 891 ipsec_delpcbpolicy(new); 892 return ENOBUFS; 893 } 894 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 895 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 896 897 if ((new->sp_out = KEY_NEWSP()) == NULL) { 898 KEY_FREESP(&new->sp_in); 899 ipsec_delpcbpolicy(new); 900 return ENOBUFS; 901 } 902 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 903 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 904 905 *pcb_sp = new; 906 907 return 0; 908 } 909 910 /* copy old ipsec policy into new */ 911 int 912 ipsec_copy_policy(old, new) 913 struct inpcbpolicy *old, *new; 914 { 915 struct secpolicy *sp; 916 917 sp = ipsec_deepcopy_policy(old->sp_in); 918 if (sp) { 919 KEY_FREESP(&new->sp_in); 920 new->sp_in = sp; 921 } else 922 return ENOBUFS; 923 924 sp = ipsec_deepcopy_policy(old->sp_out); 925 if (sp) { 926 KEY_FREESP(&new->sp_out); 927 new->sp_out = sp; 928 } else 929 return ENOBUFS; 930 931 new->priv = old->priv; 932 933 return 0; 934 } 935 936 struct ipsecrequest * 937 ipsec_newisr(void) 938 { 939 struct ipsecrequest *p; 940 941 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 942 if (p != NULL) 943 IPSECREQUEST_LOCK_INIT(p); 944 return p; 945 } 946 947 void 948 ipsec_delisr(struct ipsecrequest *p) 949 { 950 IPSECREQUEST_LOCK_DESTROY(p); 951 free(p, M_IPSEC_SR); 952 } 953 954 /* deep-copy a policy in PCB */ 955 static struct secpolicy * 956 ipsec_deepcopy_policy(src) 957 struct secpolicy *src; 958 { 959 struct ipsecrequest *newchain = NULL; 960 struct ipsecrequest *p; 961 struct ipsecrequest **q; 962 struct ipsecrequest *r; 963 struct secpolicy *dst; 964 965 if (src == NULL) 966 return NULL; 967 dst = KEY_NEWSP(); 968 if (dst == NULL) 969 return NULL; 970 971 /* 972 * deep-copy IPsec request chain. This is required since struct 973 * ipsecrequest is not reference counted. 974 */ 975 q = &newchain; 976 for (p = src->req; p; p = p->next) { 977 *q = ipsec_newisr(); 978 if (*q == NULL) 979 goto fail; 980 (*q)->saidx.proto = p->saidx.proto; 981 (*q)->saidx.mode = p->saidx.mode; 982 (*q)->level = p->level; 983 (*q)->saidx.reqid = p->saidx.reqid; 984 985 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 986 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 987 988 (*q)->sp = dst; 989 990 q = &((*q)->next); 991 } 992 993 dst->req = newchain; 994 dst->state = src->state; 995 dst->policy = src->policy; 996 /* do not touch the refcnt fields */ 997 998 return dst; 999 1000 fail: 1001 for (p = newchain; p; p = r) { 1002 r = p->next; 1003 ipsec_delisr(p); 1004 p = NULL; 1005 } 1006 return NULL; 1007 } 1008 1009 /* set policy and ipsec request if present. */ 1010 static int 1011 ipsec_set_policy(pcb_sp, optname, request, len, cred) 1012 struct secpolicy **pcb_sp; 1013 int optname; 1014 caddr_t request; 1015 size_t len; 1016 struct ucred *cred; 1017 { 1018 struct sadb_x_policy *xpl; 1019 struct secpolicy *newsp = NULL; 1020 int error; 1021 1022 /* sanity check. */ 1023 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1024 return EINVAL; 1025 if (len < sizeof(*xpl)) 1026 return EINVAL; 1027 xpl = (struct sadb_x_policy *)request; 1028 1029 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1030 printf("%s: passed policy\n", __func__); 1031 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1032 1033 /* check policy type */ 1034 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1035 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1036 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1037 return EINVAL; 1038 1039 /* check privileged socket */ 1040 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1041 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 1042 if (error) 1043 return EACCES; 1044 } 1045 1046 /* allocation new SP entry */ 1047 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1048 return error; 1049 1050 newsp->state = IPSEC_SPSTATE_ALIVE; 1051 1052 /* clear old SP and set new SP */ 1053 KEY_FREESP(pcb_sp); 1054 *pcb_sp = newsp; 1055 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1056 printf("%s: new policy\n", __func__); 1057 kdebug_secpolicy(newsp)); 1058 1059 return 0; 1060 } 1061 1062 static int 1063 ipsec_get_policy(pcb_sp, mp) 1064 struct secpolicy *pcb_sp; 1065 struct mbuf **mp; 1066 { 1067 1068 /* sanity check. */ 1069 if (pcb_sp == NULL || mp == NULL) 1070 return EINVAL; 1071 1072 *mp = key_sp2msg(pcb_sp); 1073 if (!*mp) { 1074 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1075 return ENOBUFS; 1076 } 1077 1078 (*mp)->m_type = MT_DATA; 1079 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1080 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1081 1082 return 0; 1083 } 1084 1085 int 1086 ipsec4_set_policy(inp, optname, request, len, cred) 1087 struct inpcb *inp; 1088 int optname; 1089 caddr_t request; 1090 size_t len; 1091 struct ucred *cred; 1092 { 1093 struct sadb_x_policy *xpl; 1094 struct secpolicy **pcb_sp; 1095 1096 /* sanity check. */ 1097 if (inp == NULL || request == NULL) 1098 return EINVAL; 1099 if (len < sizeof(*xpl)) 1100 return EINVAL; 1101 xpl = (struct sadb_x_policy *)request; 1102 1103 /* select direction */ 1104 switch (xpl->sadb_x_policy_dir) { 1105 case IPSEC_DIR_INBOUND: 1106 pcb_sp = &inp->inp_sp->sp_in; 1107 break; 1108 case IPSEC_DIR_OUTBOUND: 1109 pcb_sp = &inp->inp_sp->sp_out; 1110 break; 1111 default: 1112 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1113 xpl->sadb_x_policy_dir)); 1114 return EINVAL; 1115 } 1116 1117 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1118 } 1119 1120 int 1121 ipsec4_get_policy(inp, request, len, mp) 1122 struct inpcb *inp; 1123 caddr_t request; 1124 size_t len; 1125 struct mbuf **mp; 1126 { 1127 struct sadb_x_policy *xpl; 1128 struct secpolicy *pcb_sp; 1129 1130 /* sanity check. */ 1131 if (inp == NULL || request == NULL || mp == NULL) 1132 return EINVAL; 1133 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1134 if (len < sizeof(*xpl)) 1135 return EINVAL; 1136 xpl = (struct sadb_x_policy *)request; 1137 1138 /* select direction */ 1139 switch (xpl->sadb_x_policy_dir) { 1140 case IPSEC_DIR_INBOUND: 1141 pcb_sp = inp->inp_sp->sp_in; 1142 break; 1143 case IPSEC_DIR_OUTBOUND: 1144 pcb_sp = inp->inp_sp->sp_out; 1145 break; 1146 default: 1147 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1148 xpl->sadb_x_policy_dir)); 1149 return EINVAL; 1150 } 1151 1152 return ipsec_get_policy(pcb_sp, mp); 1153 } 1154 1155 /* delete policy in PCB */ 1156 int 1157 ipsec4_delete_pcbpolicy(inp) 1158 struct inpcb *inp; 1159 { 1160 IPSEC_ASSERT(inp != NULL, ("null inp")); 1161 1162 if (inp->inp_sp == NULL) 1163 return 0; 1164 1165 if (inp->inp_sp->sp_in != NULL) 1166 KEY_FREESP(&inp->inp_sp->sp_in); 1167 1168 if (inp->inp_sp->sp_out != NULL) 1169 KEY_FREESP(&inp->inp_sp->sp_out); 1170 1171 ipsec_delpcbpolicy(inp->inp_sp); 1172 inp->inp_sp = NULL; 1173 1174 return 0; 1175 } 1176 1177 #ifdef INET6 1178 int 1179 ipsec6_set_policy(in6p, optname, request, len, cred) 1180 struct in6pcb *in6p; 1181 int optname; 1182 caddr_t request; 1183 size_t len; 1184 struct ucred *cred; 1185 { 1186 struct sadb_x_policy *xpl; 1187 struct secpolicy **pcb_sp; 1188 1189 /* sanity check. */ 1190 if (in6p == NULL || request == NULL) 1191 return EINVAL; 1192 if (len < sizeof(*xpl)) 1193 return EINVAL; 1194 xpl = (struct sadb_x_policy *)request; 1195 1196 /* select direction */ 1197 switch (xpl->sadb_x_policy_dir) { 1198 case IPSEC_DIR_INBOUND: 1199 pcb_sp = &in6p->in6p_sp->sp_in; 1200 break; 1201 case IPSEC_DIR_OUTBOUND: 1202 pcb_sp = &in6p->in6p_sp->sp_out; 1203 break; 1204 default: 1205 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1206 xpl->sadb_x_policy_dir)); 1207 return EINVAL; 1208 } 1209 1210 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1211 } 1212 1213 int 1214 ipsec6_get_policy(in6p, request, len, mp) 1215 struct in6pcb *in6p; 1216 caddr_t request; 1217 size_t len; 1218 struct mbuf **mp; 1219 { 1220 struct sadb_x_policy *xpl; 1221 struct secpolicy *pcb_sp; 1222 1223 /* sanity check. */ 1224 if (in6p == NULL || request == NULL || mp == NULL) 1225 return EINVAL; 1226 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1227 if (len < sizeof(*xpl)) 1228 return EINVAL; 1229 xpl = (struct sadb_x_policy *)request; 1230 1231 /* select direction */ 1232 switch (xpl->sadb_x_policy_dir) { 1233 case IPSEC_DIR_INBOUND: 1234 pcb_sp = in6p->in6p_sp->sp_in; 1235 break; 1236 case IPSEC_DIR_OUTBOUND: 1237 pcb_sp = in6p->in6p_sp->sp_out; 1238 break; 1239 default: 1240 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1241 xpl->sadb_x_policy_dir)); 1242 return EINVAL; 1243 } 1244 1245 return ipsec_get_policy(pcb_sp, mp); 1246 } 1247 1248 int 1249 ipsec6_delete_pcbpolicy(in6p) 1250 struct in6pcb *in6p; 1251 { 1252 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1253 1254 if (in6p->in6p_sp == NULL) 1255 return 0; 1256 1257 if (in6p->in6p_sp->sp_in != NULL) 1258 KEY_FREESP(&in6p->in6p_sp->sp_in); 1259 1260 if (in6p->in6p_sp->sp_out != NULL) 1261 KEY_FREESP(&in6p->in6p_sp->sp_out); 1262 1263 ipsec_delpcbpolicy(in6p->in6p_sp); 1264 in6p->in6p_sp = NULL; 1265 1266 return 0; 1267 } 1268 #endif 1269 1270 /* 1271 * return current level. 1272 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1273 */ 1274 u_int 1275 ipsec_get_reqlevel(isr) 1276 struct ipsecrequest *isr; 1277 { 1278 u_int level = 0; 1279 u_int esp_trans_deflev, esp_net_deflev; 1280 u_int ah_trans_deflev, ah_net_deflev; 1281 1282 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1283 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1284 ("af family mismatch, src %u, dst %u", 1285 isr->sp->spidx.src.sa.sa_family, 1286 isr->sp->spidx.dst.sa.sa_family)); 1287 1288 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1289 #define IPSEC_CHECK_DEFAULT(lev) \ 1290 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1291 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1292 ? (ipsec_debug \ 1293 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1294 (lev), IPSEC_LEVEL_REQUIRE) \ 1295 : 0), \ 1296 (lev) = IPSEC_LEVEL_REQUIRE, \ 1297 (lev) \ 1298 : (lev)) 1299 1300 /* set default level */ 1301 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1302 #ifdef INET 1303 case AF_INET: 1304 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1305 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1306 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1307 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1308 break; 1309 #endif 1310 #ifdef INET6 1311 case AF_INET6: 1312 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1313 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1314 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1315 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1316 break; 1317 #endif /* INET6 */ 1318 default: 1319 panic("%s: unknown af %u", 1320 __func__, isr->sp->spidx.src.sa.sa_family); 1321 } 1322 1323 #undef IPSEC_CHECK_DEFAULT 1324 1325 /* set level */ 1326 switch (isr->level) { 1327 case IPSEC_LEVEL_DEFAULT: 1328 switch (isr->saidx.proto) { 1329 case IPPROTO_ESP: 1330 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1331 level = esp_net_deflev; 1332 else 1333 level = esp_trans_deflev; 1334 break; 1335 case IPPROTO_AH: 1336 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1337 level = ah_net_deflev; 1338 else 1339 level = ah_trans_deflev; 1340 break; 1341 case IPPROTO_IPCOMP: 1342 /* 1343 * we don't really care, as IPcomp document says that 1344 * we shouldn't compress small packets 1345 */ 1346 level = IPSEC_LEVEL_USE; 1347 break; 1348 default: 1349 panic("%s: Illegal protocol defined %u\n", __func__, 1350 isr->saidx.proto); 1351 } 1352 break; 1353 1354 case IPSEC_LEVEL_USE: 1355 case IPSEC_LEVEL_REQUIRE: 1356 level = isr->level; 1357 break; 1358 case IPSEC_LEVEL_UNIQUE: 1359 level = IPSEC_LEVEL_REQUIRE; 1360 break; 1361 1362 default: 1363 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1364 } 1365 1366 return level; 1367 } 1368 1369 /* 1370 * Check security policy requirements against the actual 1371 * packet contents. Return one if the packet should be 1372 * reject as "invalid"; otherwiser return zero to have the 1373 * packet treated as "valid". 1374 * 1375 * OUT: 1376 * 0: valid 1377 * 1: invalid 1378 */ 1379 int 1380 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1381 { 1382 struct ipsecrequest *isr; 1383 int need_auth; 1384 1385 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1386 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1387 1388 /* check policy */ 1389 switch (sp->policy) { 1390 case IPSEC_POLICY_DISCARD: 1391 return 1; 1392 case IPSEC_POLICY_BYPASS: 1393 case IPSEC_POLICY_NONE: 1394 return 0; 1395 } 1396 1397 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1398 ("invalid policy %u", sp->policy)); 1399 1400 /* XXX should compare policy against ipsec header history */ 1401 1402 need_auth = 0; 1403 for (isr = sp->req; isr != NULL; isr = isr->next) { 1404 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1405 continue; 1406 switch (isr->saidx.proto) { 1407 case IPPROTO_ESP: 1408 if ((m->m_flags & M_DECRYPTED) == 0) { 1409 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1410 printf("%s: ESP m_flags:%x\n", __func__, 1411 m->m_flags)); 1412 return 1; 1413 } 1414 1415 if (!need_auth && 1416 isr->sav != NULL && 1417 isr->sav->tdb_authalgxform != NULL && 1418 (m->m_flags & M_AUTHIPDGM) == 0) { 1419 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1420 printf("%s: ESP/AH m_flags:%x\n", __func__, 1421 m->m_flags)); 1422 return 1; 1423 } 1424 break; 1425 case IPPROTO_AH: 1426 need_auth = 1; 1427 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1428 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1429 printf("%s: AH m_flags:%x\n", __func__, 1430 m->m_flags)); 1431 return 1; 1432 } 1433 break; 1434 case IPPROTO_IPCOMP: 1435 /* 1436 * we don't really care, as IPcomp document 1437 * says that we shouldn't compress small 1438 * packets, IPComp policy should always be 1439 * treated as being in "use" level. 1440 */ 1441 break; 1442 } 1443 } 1444 return 0; /* valid */ 1445 } 1446 1447 /* 1448 * Check AH/ESP integrity. 1449 * This function is called from tcp_input(), udp_input(), 1450 * and {ah,esp}4_input for tunnel mode 1451 */ 1452 int 1453 ipsec4_in_reject(m, inp) 1454 struct mbuf *m; 1455 struct inpcb *inp; 1456 { 1457 struct secpolicy *sp; 1458 int error; 1459 int result; 1460 1461 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1462 1463 /* get SP for this packet. 1464 * When we are called from ip_forward(), we call 1465 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1466 */ 1467 if (inp == NULL) 1468 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1469 else 1470 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1471 1472 if (sp != NULL) { 1473 result = ipsec_in_reject(sp, m); 1474 if (result) 1475 ipsec4stat.ips_in_polvio++; 1476 KEY_FREESP(&sp); 1477 } else { 1478 result = 0; /* XXX should be panic ? 1479 * -> No, there may be error. */ 1480 } 1481 return result; 1482 } 1483 1484 #ifdef INET6 1485 /* 1486 * Check AH/ESP integrity. 1487 * This function is called from tcp6_input(), udp6_input(), 1488 * and {ah,esp}6_input for tunnel mode 1489 */ 1490 int 1491 ipsec6_in_reject(m, inp) 1492 struct mbuf *m; 1493 struct inpcb *inp; 1494 { 1495 struct secpolicy *sp = NULL; 1496 int error; 1497 int result; 1498 1499 /* sanity check */ 1500 if (m == NULL) 1501 return 0; /* XXX should be panic ? */ 1502 1503 /* get SP for this packet. 1504 * When we are called from ip_forward(), we call 1505 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1506 */ 1507 if (inp == NULL) 1508 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1509 else 1510 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1511 1512 if (sp != NULL) { 1513 result = ipsec_in_reject(sp, m); 1514 if (result) 1515 ipsec6stat.ips_in_polvio++; 1516 KEY_FREESP(&sp); 1517 } else { 1518 result = 0; 1519 } 1520 return result; 1521 } 1522 #endif 1523 1524 /* 1525 * compute the byte size to be occupied by IPsec header. 1526 * in case it is tunneled, it includes the size of outer IP header. 1527 * NOTE: SP passed is free in this function. 1528 */ 1529 static size_t 1530 ipsec_hdrsiz(struct secpolicy *sp) 1531 { 1532 struct ipsecrequest *isr; 1533 size_t siz; 1534 1535 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1536 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1537 1538 switch (sp->policy) { 1539 case IPSEC_POLICY_DISCARD: 1540 case IPSEC_POLICY_BYPASS: 1541 case IPSEC_POLICY_NONE: 1542 return 0; 1543 } 1544 1545 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1546 ("invalid policy %u", sp->policy)); 1547 1548 siz = 0; 1549 for (isr = sp->req; isr != NULL; isr = isr->next) { 1550 size_t clen = 0; 1551 1552 switch (isr->saidx.proto) { 1553 case IPPROTO_ESP: 1554 clen = esp_hdrsiz(isr->sav); 1555 break; 1556 case IPPROTO_AH: 1557 clen = ah_hdrsiz(isr->sav); 1558 break; 1559 case IPPROTO_IPCOMP: 1560 clen = sizeof(struct ipcomp); 1561 break; 1562 } 1563 1564 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1565 switch (isr->saidx.dst.sa.sa_family) { 1566 case AF_INET: 1567 clen += sizeof(struct ip); 1568 break; 1569 #ifdef INET6 1570 case AF_INET6: 1571 clen += sizeof(struct ip6_hdr); 1572 break; 1573 #endif 1574 default: 1575 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1576 "IPsec tunnel SA\n", __func__, 1577 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1578 break; 1579 } 1580 } 1581 siz += clen; 1582 } 1583 1584 return siz; 1585 } 1586 1587 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1588 size_t 1589 ipsec4_hdrsiz(m, dir, inp) 1590 struct mbuf *m; 1591 u_int dir; 1592 struct inpcb *inp; 1593 { 1594 struct secpolicy *sp; 1595 int error; 1596 size_t size; 1597 1598 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1599 1600 /* get SP for this packet. 1601 * When we are called from ip_forward(), we call 1602 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1603 */ 1604 if (inp == NULL) 1605 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1606 else 1607 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1608 1609 if (sp != NULL) { 1610 size = ipsec_hdrsiz(sp); 1611 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1612 printf("%s: size:%lu.\n", __func__, 1613 (unsigned long)size)); 1614 1615 KEY_FREESP(&sp); 1616 } else { 1617 size = 0; /* XXX should be panic ? 1618 * -> No, we are called w/o knowing if 1619 * IPsec processing is needed. */ 1620 } 1621 return size; 1622 } 1623 1624 #ifdef INET6 1625 /* This function is called from ipsec6_hdrsize_tcp(), 1626 * and maybe from ip6_forward.() 1627 */ 1628 size_t 1629 ipsec6_hdrsiz(m, dir, in6p) 1630 struct mbuf *m; 1631 u_int dir; 1632 struct in6pcb *in6p; 1633 { 1634 struct secpolicy *sp; 1635 int error; 1636 size_t size; 1637 1638 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1639 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1640 ("socket w/o inpcb")); 1641 1642 /* get SP for this packet */ 1643 /* XXX Is it right to call with IP_FORWARDING. */ 1644 if (in6p == NULL) 1645 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1646 else 1647 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1648 1649 if (sp == NULL) 1650 return 0; 1651 size = ipsec_hdrsiz(sp); 1652 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1653 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1654 KEY_FREESP(&sp); 1655 1656 return size; 1657 } 1658 #endif /*INET6*/ 1659 1660 /* 1661 * Check the variable replay window. 1662 * ipsec_chkreplay() performs replay check before ICV verification. 1663 * ipsec_updatereplay() updates replay bitmap. This must be called after 1664 * ICV verification (it also performs replay check, which is usually done 1665 * beforehand). 1666 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1667 * 1668 * based on RFC 2401. 1669 */ 1670 int 1671 ipsec_chkreplay(seq, sav) 1672 u_int32_t seq; 1673 struct secasvar *sav; 1674 { 1675 const struct secreplay *replay; 1676 u_int32_t diff; 1677 int fr; 1678 u_int32_t wsizeb; /* constant: bits of window size */ 1679 int frlast; /* constant: last frame */ 1680 1681 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1682 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1683 1684 replay = sav->replay; 1685 1686 if (replay->wsize == 0) 1687 return 1; /* no need to check replay. */ 1688 1689 /* constant */ 1690 frlast = replay->wsize - 1; 1691 wsizeb = replay->wsize << 3; 1692 1693 /* sequence number of 0 is invalid */ 1694 if (seq == 0) 1695 return 0; 1696 1697 /* first time is always okay */ 1698 if (replay->count == 0) 1699 return 1; 1700 1701 if (seq > replay->lastseq) { 1702 /* larger sequences are okay */ 1703 return 1; 1704 } else { 1705 /* seq is equal or less than lastseq. */ 1706 diff = replay->lastseq - seq; 1707 1708 /* over range to check, i.e. too old or wrapped */ 1709 if (diff >= wsizeb) 1710 return 0; 1711 1712 fr = frlast - diff / 8; 1713 1714 /* this packet already seen ? */ 1715 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1716 return 0; 1717 1718 /* out of order but good */ 1719 return 1; 1720 } 1721 } 1722 1723 /* 1724 * check replay counter whether to update or not. 1725 * OUT: 0: OK 1726 * 1: NG 1727 */ 1728 int 1729 ipsec_updatereplay(seq, sav) 1730 u_int32_t seq; 1731 struct secasvar *sav; 1732 { 1733 struct secreplay *replay; 1734 u_int32_t diff; 1735 int fr; 1736 u_int32_t wsizeb; /* constant: bits of window size */ 1737 int frlast; /* constant: last frame */ 1738 1739 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1740 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1741 1742 replay = sav->replay; 1743 1744 if (replay->wsize == 0) 1745 goto ok; /* no need to check replay. */ 1746 1747 /* constant */ 1748 frlast = replay->wsize - 1; 1749 wsizeb = replay->wsize << 3; 1750 1751 /* sequence number of 0 is invalid */ 1752 if (seq == 0) 1753 return 1; 1754 1755 /* first time */ 1756 if (replay->count == 0) { 1757 replay->lastseq = seq; 1758 bzero(replay->bitmap, replay->wsize); 1759 (replay->bitmap)[frlast] = 1; 1760 goto ok; 1761 } 1762 1763 if (seq > replay->lastseq) { 1764 /* seq is larger than lastseq. */ 1765 diff = seq - replay->lastseq; 1766 1767 /* new larger sequence number */ 1768 if (diff < wsizeb) { 1769 /* In window */ 1770 /* set bit for this packet */ 1771 vshiftl(replay->bitmap, diff, replay->wsize); 1772 (replay->bitmap)[frlast] |= 1; 1773 } else { 1774 /* this packet has a "way larger" */ 1775 bzero(replay->bitmap, replay->wsize); 1776 (replay->bitmap)[frlast] = 1; 1777 } 1778 replay->lastseq = seq; 1779 1780 /* larger is good */ 1781 } else { 1782 /* seq is equal or less than lastseq. */ 1783 diff = replay->lastseq - seq; 1784 1785 /* over range to check, i.e. too old or wrapped */ 1786 if (diff >= wsizeb) 1787 return 1; 1788 1789 fr = frlast - diff / 8; 1790 1791 /* this packet already seen ? */ 1792 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1793 return 1; 1794 1795 /* mark as seen */ 1796 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1797 1798 /* out of order but good */ 1799 } 1800 1801 ok: 1802 if (replay->count == ~0) { 1803 1804 /* set overflow flag */ 1805 replay->overflow++; 1806 1807 /* don't increment, no more packets accepted */ 1808 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1809 return 1; 1810 1811 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1812 __func__, replay->overflow, ipsec_logsastr(sav))); 1813 } 1814 1815 replay->count++; 1816 1817 return 0; 1818 } 1819 1820 /* 1821 * shift variable length buffer to left. 1822 * IN: bitmap: pointer to the buffer 1823 * nbit: the number of to shift. 1824 * wsize: buffer size (bytes). 1825 */ 1826 static void 1827 vshiftl(bitmap, nbit, wsize) 1828 unsigned char *bitmap; 1829 int nbit, wsize; 1830 { 1831 int s, j, i; 1832 unsigned char over; 1833 1834 for (j = 0; j < nbit; j += 8) { 1835 s = (nbit - j < 8) ? (nbit - j): 8; 1836 bitmap[0] <<= s; 1837 for (i = 1; i < wsize; i++) { 1838 over = (bitmap[i] >> (8 - s)); 1839 bitmap[i] <<= s; 1840 bitmap[i-1] |= over; 1841 } 1842 } 1843 1844 return; 1845 } 1846 1847 /* Return a printable string for the IPv4 address. */ 1848 static char * 1849 inet_ntoa4(struct in_addr ina) 1850 { 1851 static char buf[4][4 * sizeof "123" + 4]; 1852 unsigned char *ucp = (unsigned char *) &ina; 1853 static int i = 3; 1854 1855 /* XXX-BZ returns static buffer. */ 1856 i = (i + 1) % 4; 1857 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1858 ucp[2] & 0xff, ucp[3] & 0xff); 1859 return (buf[i]); 1860 } 1861 1862 /* Return a printable string for the address. */ 1863 char * 1864 ipsec_address(union sockaddr_union* sa) 1865 { 1866 #ifdef INET6 1867 char ip6buf[INET6_ADDRSTRLEN]; 1868 #endif 1869 switch (sa->sa.sa_family) { 1870 #ifdef INET 1871 case AF_INET: 1872 return inet_ntoa4(sa->sin.sin_addr); 1873 #endif /* INET */ 1874 1875 #ifdef INET6 1876 case AF_INET6: 1877 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1878 #endif /* INET6 */ 1879 1880 default: 1881 return "(unknown address family)"; 1882 } 1883 } 1884 1885 const char * 1886 ipsec_logsastr(sav) 1887 struct secasvar *sav; 1888 { 1889 static char buf[256]; 1890 char *p; 1891 struct secasindex *saidx = &sav->sah->saidx; 1892 1893 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1894 ("address family mismatch")); 1895 1896 p = buf; 1897 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1898 while (p && *p) 1899 p++; 1900 /* NB: only use ipsec_address on one address at a time */ 1901 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1902 ipsec_address(&saidx->src)); 1903 while (p && *p) 1904 p++; 1905 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1906 ipsec_address(&saidx->dst)); 1907 1908 return buf; 1909 } 1910 1911 void 1912 ipsec_dumpmbuf(m) 1913 struct mbuf *m; 1914 { 1915 int totlen; 1916 int i; 1917 u_char *p; 1918 1919 totlen = 0; 1920 printf("---\n"); 1921 while (m) { 1922 p = mtod(m, u_char *); 1923 for (i = 0; i < m->m_len; i++) { 1924 printf("%02x ", p[i]); 1925 totlen++; 1926 if (totlen % 16 == 0) 1927 printf("\n"); 1928 } 1929 m = m->m_next; 1930 } 1931 if (totlen % 16 != 0) 1932 printf("\n"); 1933 printf("---\n"); 1934 } 1935 1936 static void 1937 ipsec_attach(void) 1938 { 1939 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1940 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1941 } 1942 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL); 1943 1944 1945 /* XXX this stuff doesn't belong here... */ 1946 1947 static struct xformsw* xforms = NULL; 1948 1949 /* 1950 * Register a transform; typically at system startup. 1951 */ 1952 void 1953 xform_register(struct xformsw* xsp) 1954 { 1955 xsp->xf_next = xforms; 1956 xforms = xsp; 1957 } 1958 1959 /* 1960 * Initialize transform support in an sav. 1961 */ 1962 int 1963 xform_init(struct secasvar *sav, int xftype) 1964 { 1965 struct xformsw *xsp; 1966 1967 if (sav->tdb_xform != NULL) /* previously initialized */ 1968 return 0; 1969 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1970 if (xsp->xf_type == xftype) 1971 return (*xsp->xf_init)(sav, xsp); 1972 return EINVAL; 1973 } 1974