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 <netipsec/ipsec.h> 80 #ifdef INET6 81 #include <netipsec/ipsec6.h> 82 #endif 83 #include <netipsec/ah_var.h> 84 #include <netipsec/esp_var.h> 85 #include <netipsec/ipcomp.h> /*XXX*/ 86 #include <netipsec/ipcomp_var.h> 87 88 #include <netipsec/key.h> 89 #include <netipsec/keydb.h> 90 #include <netipsec/key_debug.h> 91 92 #include <netipsec/xform.h> 93 94 #include <machine/in_cksum.h> 95 96 #ifdef IPSEC_DEBUG 97 int ipsec_debug = 1; 98 #else 99 int ipsec_debug = 0; 100 #endif 101 102 /* NB: name changed so netstat doesn't use it */ 103 struct newipsecstat newipsecstat; 104 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 105 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 106 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 107 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 108 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 109 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 110 struct secpolicy ip4_def_policy; 111 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 112 int ip4_esp_randpad = -1; 113 /* 114 * Crypto support requirements: 115 * 116 * 1 require hardware support 117 * -1 require software support 118 * 0 take anything 119 */ 120 int crypto_support = 0; 121 122 SYSCTL_DECL(_net_inet_ipsec); 123 124 /* net.inet.ipsec */ 125 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 126 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 127 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 128 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 129 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 130 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 131 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 132 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 133 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 134 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 135 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 136 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 137 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 138 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 139 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 140 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 141 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 142 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 143 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 144 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 145 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 146 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 147 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 148 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 149 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 150 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 151 152 #ifdef REGRESSION 153 /* 154 * When set to 1, IPsec will send packets with the same sequence number. 155 * This allows to verify if the other side has proper replay attacks detection. 156 */ 157 int ipsec_replay = 0; 158 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 159 "Emulate replay attack"); 160 /* 161 * When set 1, IPsec will send packets with corrupted HMAC. 162 * This allows to verify if the other side properly detects modified packets. 163 */ 164 int ipsec_integrity = 0; 165 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 166 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 167 #endif 168 169 #ifdef INET6 170 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 171 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 172 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 173 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 174 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 175 int ip6_esp_randpad = -1; 176 177 SYSCTL_DECL(_net_inet6_ipsec6); 178 179 /* net.inet6.ipsec6 */ 180 #ifdef COMPAT_KAME 181 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 182 0,0, compat_ipsecstats_sysctl, "S", ""); 183 #endif /* COMPAT_KAME */ 184 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 185 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 186 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 187 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 189 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 191 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 193 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 195 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 197 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 199 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 200 #endif /* INET6 */ 201 202 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 203 #ifdef INET6 204 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 205 #endif 206 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 207 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 208 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 209 #ifdef INET6 210 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 211 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 212 #endif 213 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 214 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 215 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 216 int optname, caddr_t request, size_t len, int priv)); 217 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 218 static void vshiftl __P((unsigned char *, int, int)); 219 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 220 221 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 222 223 /* 224 * Return a held reference to the default SP. 225 */ 226 static struct secpolicy * 227 key_allocsp_default(const char* where, int tag) 228 { 229 struct secpolicy *sp; 230 231 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 232 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 233 234 sp = &ip4_def_policy; 235 if (sp->policy != IPSEC_POLICY_DISCARD && 236 sp->policy != IPSEC_POLICY_NONE) { 237 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 238 sp->policy, IPSEC_POLICY_NONE)); 239 sp->policy = IPSEC_POLICY_NONE; 240 } 241 key_addref(sp); 242 243 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 244 printf("DP key_allocsp_default returns SP:%p (%u)\n", 245 sp, sp->refcnt)); 246 return sp; 247 } 248 #define KEY_ALLOCSP_DEFAULT() \ 249 key_allocsp_default(__FILE__, __LINE__) 250 251 /* 252 * For OUTBOUND packet having a socket. Searching SPD for packet, 253 * and return a pointer to SP. 254 * OUT: NULL: no apropreate SP found, the following value is set to error. 255 * 0 : bypass 256 * EACCES : discard packet. 257 * ENOENT : ipsec_acquire() in progress, maybe. 258 * others : error occured. 259 * others: a pointer to SP 260 * 261 * NOTE: IPv6 mapped adddress concern is implemented here. 262 */ 263 struct secpolicy * 264 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 265 { 266 struct secpolicy *sp; 267 268 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 269 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 270 ("invalid direction %u", dir)); 271 272 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 273 if (sp == NULL) /*XXX????*/ 274 sp = KEY_ALLOCSP_DEFAULT(); 275 IPSEC_ASSERT(sp != NULL, ("null SP")); 276 return sp; 277 } 278 279 /* 280 * For OUTBOUND packet having a socket. Searching SPD for packet, 281 * and return a pointer to SP. 282 * OUT: NULL: no apropreate SP found, the following value is set to error. 283 * 0 : bypass 284 * EACCES : discard packet. 285 * ENOENT : ipsec_acquire() in progress, maybe. 286 * others : error occured. 287 * others: a pointer to SP 288 * 289 * NOTE: IPv6 mapped adddress concern is implemented here. 290 */ 291 struct secpolicy * 292 ipsec_getpolicybysock(m, dir, inp, error) 293 struct mbuf *m; 294 u_int dir; 295 struct inpcb *inp; 296 int *error; 297 { 298 struct inpcbpolicy *pcbsp = NULL; 299 struct secpolicy *currsp = NULL; /* policy on socket */ 300 struct secpolicy *sp; 301 302 IPSEC_ASSERT(m != NULL, ("null mbuf")); 303 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 304 IPSEC_ASSERT(error != NULL, ("null error")); 305 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 306 ("invalid direction %u", dir)); 307 308 /* set spidx in pcb */ 309 if (inp->inp_vflag & INP_IPV6PROTO) { 310 #ifdef INET6 311 *error = ipsec6_setspidx_in6pcb(m, inp); 312 pcbsp = inp->in6p_sp; 313 #else 314 *error = EINVAL; /* should not happen */ 315 #endif 316 } else { 317 *error = ipsec4_setspidx_inpcb(m, inp); 318 pcbsp = inp->inp_sp; 319 } 320 if (*error) 321 return NULL; 322 323 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 324 switch (dir) { 325 case IPSEC_DIR_INBOUND: 326 currsp = pcbsp->sp_in; 327 break; 328 case IPSEC_DIR_OUTBOUND: 329 currsp = pcbsp->sp_out; 330 break; 331 } 332 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 333 334 if (pcbsp->priv) { /* when privilieged socket */ 335 switch (currsp->policy) { 336 case IPSEC_POLICY_BYPASS: 337 case IPSEC_POLICY_IPSEC: 338 key_addref(currsp); 339 sp = currsp; 340 break; 341 342 case IPSEC_POLICY_ENTRUST: 343 /* look for a policy in SPD */ 344 sp = KEY_ALLOCSP(&currsp->spidx, dir); 345 if (sp == NULL) /* no SP found */ 346 sp = KEY_ALLOCSP_DEFAULT(); 347 break; 348 349 default: 350 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 351 __func__, currsp->policy)); 352 *error = EINVAL; 353 return NULL; 354 } 355 } else { /* unpriv, SPD has policy */ 356 sp = KEY_ALLOCSP(&currsp->spidx, dir); 357 if (sp == NULL) { /* no SP found */ 358 switch (currsp->policy) { 359 case IPSEC_POLICY_BYPASS: 360 ipseclog((LOG_ERR, "%s: Illegal policy for " 361 "non-priviliged defined %d\n", 362 __func__, currsp->policy)); 363 *error = EINVAL; 364 return NULL; 365 366 case IPSEC_POLICY_ENTRUST: 367 sp = KEY_ALLOCSP_DEFAULT(); 368 break; 369 370 case IPSEC_POLICY_IPSEC: 371 key_addref(currsp); 372 sp = currsp; 373 break; 374 375 default: 376 ipseclog((LOG_ERR, "%s: Invalid policy for " 377 "PCB %d\n", __func__, currsp->policy)); 378 *error = EINVAL; 379 return NULL; 380 } 381 } 382 } 383 IPSEC_ASSERT(sp != NULL, 384 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 385 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 386 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 387 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 388 return sp; 389 } 390 391 /* 392 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 393 * and return a pointer to SP. 394 * OUT: positive: a pointer to the entry for security policy leaf matched. 395 * NULL: no apropreate SP found, the following value is set to error. 396 * 0 : bypass 397 * EACCES : discard packet. 398 * ENOENT : ipsec_acquire() in progress, maybe. 399 * others : error occured. 400 */ 401 struct secpolicy * 402 ipsec_getpolicybyaddr(m, dir, flag, error) 403 struct mbuf *m; 404 u_int dir; 405 int flag; 406 int *error; 407 { 408 struct secpolicyindex spidx; 409 struct secpolicy *sp; 410 411 IPSEC_ASSERT(m != NULL, ("null mbuf")); 412 IPSEC_ASSERT(error != NULL, ("null error")); 413 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 414 ("invalid direction %u", dir)); 415 416 sp = NULL; 417 if (key_havesp(dir)) { 418 /* Make an index to look for a policy. */ 419 *error = ipsec_setspidx(m, &spidx, 420 (flag & IP_FORWARDING) ? 0 : 1); 421 if (*error != 0) { 422 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 423 __func__, dir, flag)); 424 return NULL; 425 } 426 spidx.dir = dir; 427 428 sp = KEY_ALLOCSP(&spidx, dir); 429 } 430 if (sp == NULL) /* no SP found, use system default */ 431 sp = KEY_ALLOCSP_DEFAULT(); 432 IPSEC_ASSERT(sp != NULL, ("null SP")); 433 return sp; 434 } 435 436 struct secpolicy * 437 ipsec4_checkpolicy(m, dir, flag, error, inp) 438 struct mbuf *m; 439 u_int dir, flag; 440 int *error; 441 struct inpcb *inp; 442 { 443 struct secpolicy *sp; 444 445 *error = 0; 446 if (inp == NULL) 447 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 448 else 449 sp = ipsec_getpolicybysock(m, dir, inp, error); 450 if (sp == NULL) { 451 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 452 newipsecstat.ips_out_inval++; 453 return NULL; 454 } 455 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 456 switch (sp->policy) { 457 case IPSEC_POLICY_ENTRUST: 458 default: 459 printf("%s: invalid policy %u\n", __func__, sp->policy); 460 /* fall thru... */ 461 case IPSEC_POLICY_DISCARD: 462 newipsecstat.ips_out_polvio++; 463 *error = -EINVAL; /* packet is discarded by caller */ 464 break; 465 case IPSEC_POLICY_BYPASS: 466 case IPSEC_POLICY_NONE: 467 KEY_FREESP(&sp); 468 sp = NULL; /* NB: force NULL result */ 469 break; 470 case IPSEC_POLICY_IPSEC: 471 if (sp->req == NULL) /* acquire an SA */ 472 *error = key_spdacquire(sp); 473 break; 474 } 475 if (*error != 0) { 476 KEY_FREESP(&sp); 477 sp = NULL; 478 } 479 return sp; 480 } 481 482 static int 483 ipsec4_setspidx_inpcb(m, pcb) 484 struct mbuf *m; 485 struct inpcb *pcb; 486 { 487 int error; 488 489 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 490 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 491 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 492 ("null sp_in || sp_out")); 493 494 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 495 if (error == 0) { 496 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 497 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 498 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 499 } else { 500 bzero(&pcb->inp_sp->sp_in->spidx, 501 sizeof (pcb->inp_sp->sp_in->spidx)); 502 bzero(&pcb->inp_sp->sp_out->spidx, 503 sizeof (pcb->inp_sp->sp_in->spidx)); 504 } 505 return error; 506 } 507 508 #ifdef INET6 509 static int 510 ipsec6_setspidx_in6pcb(m, pcb) 511 struct mbuf *m; 512 struct in6pcb *pcb; 513 { 514 struct secpolicyindex *spidx; 515 int error; 516 517 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 518 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 519 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 520 ("null sp_in || sp_out")); 521 522 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 523 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 524 525 spidx = &pcb->in6p_sp->sp_in->spidx; 526 error = ipsec_setspidx(m, spidx, 1); 527 if (error) 528 goto bad; 529 spidx->dir = IPSEC_DIR_INBOUND; 530 531 spidx = &pcb->in6p_sp->sp_out->spidx; 532 error = ipsec_setspidx(m, spidx, 1); 533 if (error) 534 goto bad; 535 spidx->dir = IPSEC_DIR_OUTBOUND; 536 537 return 0; 538 539 bad: 540 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 541 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 542 return error; 543 } 544 #endif 545 546 /* 547 * configure security policy index (src/dst/proto/sport/dport) 548 * by looking at the content of mbuf. 549 * the caller is responsible for error recovery (like clearing up spidx). 550 */ 551 static int 552 ipsec_setspidx(m, spidx, needport) 553 struct mbuf *m; 554 struct secpolicyindex *spidx; 555 int needport; 556 { 557 struct ip *ip = NULL; 558 struct ip ipbuf; 559 u_int v; 560 struct mbuf *n; 561 int len; 562 int error; 563 564 IPSEC_ASSERT(m != NULL, ("null mbuf")); 565 566 /* 567 * validate m->m_pkthdr.len. we see incorrect length if we 568 * mistakenly call this function with inconsistent mbuf chain 569 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 570 */ 571 len = 0; 572 for (n = m; n; n = n->m_next) 573 len += n->m_len; 574 if (m->m_pkthdr.len != len) { 575 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 576 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 577 __func__, len, m->m_pkthdr.len)); 578 return EINVAL; 579 } 580 581 if (m->m_pkthdr.len < sizeof(struct ip)) { 582 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 583 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 584 __func__, m->m_pkthdr.len)); 585 return EINVAL; 586 } 587 588 if (m->m_len >= sizeof(*ip)) 589 ip = mtod(m, struct ip *); 590 else { 591 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 592 ip = &ipbuf; 593 } 594 #ifdef _IP_VHL 595 v = _IP_VHL_V(ip->ip_vhl); 596 #else 597 v = ip->ip_v; 598 #endif 599 switch (v) { 600 case 4: 601 error = ipsec4_setspidx_ipaddr(m, spidx); 602 if (error) 603 return error; 604 ipsec4_get_ulp(m, spidx, needport); 605 return 0; 606 #ifdef INET6 607 case 6: 608 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 609 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 610 printf("%s: pkthdr len(%d) too small (v6), " 611 "ignored\n", __func__, m->m_pkthdr.len)); 612 return EINVAL; 613 } 614 error = ipsec6_setspidx_ipaddr(m, spidx); 615 if (error) 616 return error; 617 ipsec6_get_ulp(m, spidx, needport); 618 return 0; 619 #endif 620 default: 621 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 622 printf("%s: " "unknown IP version %u, ignored.\n", 623 __func__, v)); 624 return EINVAL; 625 } 626 } 627 628 static void 629 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 630 { 631 u_int8_t nxt; 632 int off; 633 634 /* sanity check */ 635 IPSEC_ASSERT(m != NULL, ("null mbuf")); 636 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 637 638 /* NB: ip_input() flips it into host endian XXX need more checking */ 639 if (m->m_len < sizeof (struct ip)) { 640 struct ip *ip = mtod(m, struct ip *); 641 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 642 goto done; 643 #ifdef _IP_VHL 644 off = _IP_VHL_HL(ip->ip_vhl) << 2; 645 #else 646 off = ip->ip_hl << 2; 647 #endif 648 nxt = ip->ip_p; 649 } else { 650 struct ip ih; 651 652 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 653 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 654 goto done; 655 #ifdef _IP_VHL 656 off = _IP_VHL_HL(ih.ip_vhl) << 2; 657 #else 658 off = ih.ip_hl << 2; 659 #endif 660 nxt = ih.ip_p; 661 } 662 663 while (off < m->m_pkthdr.len) { 664 struct ip6_ext ip6e; 665 struct tcphdr th; 666 struct udphdr uh; 667 668 switch (nxt) { 669 case IPPROTO_TCP: 670 spidx->ul_proto = nxt; 671 if (!needport) 672 goto done_proto; 673 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 674 goto done; 675 m_copydata(m, off, sizeof (th), (caddr_t) &th); 676 spidx->src.sin.sin_port = th.th_sport; 677 spidx->dst.sin.sin_port = th.th_dport; 678 return; 679 case IPPROTO_UDP: 680 spidx->ul_proto = nxt; 681 if (!needport) 682 goto done_proto; 683 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 684 goto done; 685 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 686 spidx->src.sin.sin_port = uh.uh_sport; 687 spidx->dst.sin.sin_port = uh.uh_dport; 688 return; 689 case IPPROTO_AH: 690 if (off + sizeof(ip6e) > m->m_pkthdr.len) 691 goto done; 692 /* XXX sigh, this works but is totally bogus */ 693 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 694 off += (ip6e.ip6e_len + 2) << 2; 695 nxt = ip6e.ip6e_nxt; 696 break; 697 case IPPROTO_ICMP: 698 default: 699 /* XXX intermediate headers??? */ 700 spidx->ul_proto = nxt; 701 goto done_proto; 702 } 703 } 704 done: 705 spidx->ul_proto = IPSEC_ULPROTO_ANY; 706 done_proto: 707 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 708 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 709 } 710 711 /* assumes that m is sane */ 712 static int 713 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 714 { 715 static const struct sockaddr_in template = { 716 sizeof (struct sockaddr_in), 717 AF_INET, 718 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 719 }; 720 721 spidx->src.sin = template; 722 spidx->dst.sin = template; 723 724 if (m->m_len < sizeof (struct ip)) { 725 m_copydata(m, offsetof(struct ip, ip_src), 726 sizeof (struct in_addr), 727 (caddr_t) &spidx->src.sin.sin_addr); 728 m_copydata(m, offsetof(struct ip, ip_dst), 729 sizeof (struct in_addr), 730 (caddr_t) &spidx->dst.sin.sin_addr); 731 } else { 732 struct ip *ip = mtod(m, struct ip *); 733 spidx->src.sin.sin_addr = ip->ip_src; 734 spidx->dst.sin.sin_addr = ip->ip_dst; 735 } 736 737 spidx->prefs = sizeof(struct in_addr) << 3; 738 spidx->prefd = sizeof(struct in_addr) << 3; 739 740 return 0; 741 } 742 743 #ifdef INET6 744 static void 745 ipsec6_get_ulp(m, spidx, needport) 746 struct mbuf *m; 747 struct secpolicyindex *spidx; 748 int needport; 749 { 750 int off, nxt; 751 struct tcphdr th; 752 struct udphdr uh; 753 754 /* sanity check */ 755 if (m == NULL) 756 panic("%s: NULL pointer was passed.\n", __func__); 757 758 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 759 printf("%s:\n", __func__); kdebug_mbuf(m)); 760 761 /* set default */ 762 spidx->ul_proto = IPSEC_ULPROTO_ANY; 763 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 764 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 765 766 nxt = -1; 767 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 768 if (off < 0 || m->m_pkthdr.len < off) 769 return; 770 771 switch (nxt) { 772 case IPPROTO_TCP: 773 spidx->ul_proto = nxt; 774 if (!needport) 775 break; 776 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 777 break; 778 m_copydata(m, off, sizeof(th), (caddr_t)&th); 779 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 780 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 781 break; 782 case IPPROTO_UDP: 783 spidx->ul_proto = nxt; 784 if (!needport) 785 break; 786 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 787 break; 788 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 789 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 790 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 791 break; 792 case IPPROTO_ICMPV6: 793 default: 794 /* XXX intermediate headers??? */ 795 spidx->ul_proto = nxt; 796 break; 797 } 798 } 799 800 /* assumes that m is sane */ 801 static int 802 ipsec6_setspidx_ipaddr(m, spidx) 803 struct mbuf *m; 804 struct secpolicyindex *spidx; 805 { 806 struct ip6_hdr *ip6 = NULL; 807 struct ip6_hdr ip6buf; 808 struct sockaddr_in6 *sin6; 809 810 if (m->m_len >= sizeof(*ip6)) 811 ip6 = mtod(m, struct ip6_hdr *); 812 else { 813 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 814 ip6 = &ip6buf; 815 } 816 817 sin6 = (struct sockaddr_in6 *)&spidx->src; 818 bzero(sin6, sizeof(*sin6)); 819 sin6->sin6_family = AF_INET6; 820 sin6->sin6_len = sizeof(struct sockaddr_in6); 821 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 822 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 823 sin6->sin6_addr.s6_addr16[1] = 0; 824 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 825 } 826 spidx->prefs = sizeof(struct in6_addr) << 3; 827 828 sin6 = (struct sockaddr_in6 *)&spidx->dst; 829 bzero(sin6, sizeof(*sin6)); 830 sin6->sin6_family = AF_INET6; 831 sin6->sin6_len = sizeof(struct sockaddr_in6); 832 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 833 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 834 sin6->sin6_addr.s6_addr16[1] = 0; 835 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 836 } 837 spidx->prefd = sizeof(struct in6_addr) << 3; 838 839 return 0; 840 } 841 #endif 842 843 static void 844 ipsec_delpcbpolicy(p) 845 struct inpcbpolicy *p; 846 { 847 free(p, M_IPSEC_INPCB); 848 } 849 850 /* initialize policy in PCB */ 851 int 852 ipsec_init_policy(so, pcb_sp) 853 struct socket *so; 854 struct inpcbpolicy **pcb_sp; 855 { 856 struct inpcbpolicy *new; 857 858 /* sanity check. */ 859 if (so == NULL || pcb_sp == NULL) 860 panic("%s: NULL pointer was passed.\n", __func__); 861 862 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 863 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 864 if (new == NULL) { 865 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 866 return ENOBUFS; 867 } 868 869 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 870 871 if ((new->sp_in = KEY_NEWSP()) == NULL) { 872 ipsec_delpcbpolicy(new); 873 return ENOBUFS; 874 } 875 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 876 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 877 878 if ((new->sp_out = KEY_NEWSP()) == NULL) { 879 KEY_FREESP(&new->sp_in); 880 ipsec_delpcbpolicy(new); 881 return ENOBUFS; 882 } 883 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 884 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 885 886 *pcb_sp = new; 887 888 return 0; 889 } 890 891 /* copy old ipsec policy into new */ 892 int 893 ipsec_copy_policy(old, new) 894 struct inpcbpolicy *old, *new; 895 { 896 struct secpolicy *sp; 897 898 sp = ipsec_deepcopy_policy(old->sp_in); 899 if (sp) { 900 KEY_FREESP(&new->sp_in); 901 new->sp_in = sp; 902 } else 903 return ENOBUFS; 904 905 sp = ipsec_deepcopy_policy(old->sp_out); 906 if (sp) { 907 KEY_FREESP(&new->sp_out); 908 new->sp_out = sp; 909 } else 910 return ENOBUFS; 911 912 new->priv = old->priv; 913 914 return 0; 915 } 916 917 struct ipsecrequest * 918 ipsec_newisr(void) 919 { 920 struct ipsecrequest *p; 921 922 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 923 if (p != NULL) 924 IPSECREQUEST_LOCK_INIT(p); 925 return p; 926 } 927 928 void 929 ipsec_delisr(struct ipsecrequest *p) 930 { 931 IPSECREQUEST_LOCK_DESTROY(p); 932 free(p, M_IPSEC_SR); 933 } 934 935 /* deep-copy a policy in PCB */ 936 static struct secpolicy * 937 ipsec_deepcopy_policy(src) 938 struct secpolicy *src; 939 { 940 struct ipsecrequest *newchain = NULL; 941 struct ipsecrequest *p; 942 struct ipsecrequest **q; 943 struct ipsecrequest *r; 944 struct secpolicy *dst; 945 946 if (src == NULL) 947 return NULL; 948 dst = KEY_NEWSP(); 949 if (dst == NULL) 950 return NULL; 951 952 /* 953 * deep-copy IPsec request chain. This is required since struct 954 * ipsecrequest is not reference counted. 955 */ 956 q = &newchain; 957 for (p = src->req; p; p = p->next) { 958 *q = ipsec_newisr(); 959 if (*q == NULL) 960 goto fail; 961 (*q)->saidx.proto = p->saidx.proto; 962 (*q)->saidx.mode = p->saidx.mode; 963 (*q)->level = p->level; 964 (*q)->saidx.reqid = p->saidx.reqid; 965 966 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 967 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 968 969 (*q)->sp = dst; 970 971 q = &((*q)->next); 972 } 973 974 dst->req = newchain; 975 dst->state = src->state; 976 dst->policy = src->policy; 977 /* do not touch the refcnt fields */ 978 979 return dst; 980 981 fail: 982 for (p = newchain; p; p = r) { 983 r = p->next; 984 ipsec_delisr(p); 985 p = NULL; 986 } 987 return NULL; 988 } 989 990 /* set policy and ipsec request if present. */ 991 static int 992 ipsec_set_policy(pcb_sp, optname, request, len, priv) 993 struct secpolicy **pcb_sp; 994 int optname; 995 caddr_t request; 996 size_t len; 997 int priv; 998 { 999 struct sadb_x_policy *xpl; 1000 struct secpolicy *newsp = NULL; 1001 int error; 1002 1003 /* sanity check. */ 1004 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1005 return EINVAL; 1006 if (len < sizeof(*xpl)) 1007 return EINVAL; 1008 xpl = (struct sadb_x_policy *)request; 1009 1010 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1011 printf("%s: passed policy\n", __func__); 1012 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1013 1014 /* check policy type */ 1015 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1016 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1017 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1018 return EINVAL; 1019 1020 /* check privileged socket */ 1021 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1022 return EACCES; 1023 1024 /* allocation new SP entry */ 1025 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1026 return error; 1027 1028 newsp->state = IPSEC_SPSTATE_ALIVE; 1029 1030 /* clear old SP and set new SP */ 1031 KEY_FREESP(pcb_sp); 1032 *pcb_sp = newsp; 1033 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1034 printf("%s: new policy\n", __func__); 1035 kdebug_secpolicy(newsp)); 1036 1037 return 0; 1038 } 1039 1040 static int 1041 ipsec_get_policy(pcb_sp, mp) 1042 struct secpolicy *pcb_sp; 1043 struct mbuf **mp; 1044 { 1045 1046 /* sanity check. */ 1047 if (pcb_sp == NULL || mp == NULL) 1048 return EINVAL; 1049 1050 *mp = key_sp2msg(pcb_sp); 1051 if (!*mp) { 1052 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1053 return ENOBUFS; 1054 } 1055 1056 (*mp)->m_type = MT_DATA; 1057 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1058 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1059 1060 return 0; 1061 } 1062 1063 int 1064 ipsec4_set_policy(inp, optname, request, len, priv) 1065 struct inpcb *inp; 1066 int optname; 1067 caddr_t request; 1068 size_t len; 1069 int priv; 1070 { 1071 struct sadb_x_policy *xpl; 1072 struct secpolicy **pcb_sp; 1073 1074 /* sanity check. */ 1075 if (inp == NULL || request == NULL) 1076 return EINVAL; 1077 if (len < sizeof(*xpl)) 1078 return EINVAL; 1079 xpl = (struct sadb_x_policy *)request; 1080 1081 /* select direction */ 1082 switch (xpl->sadb_x_policy_dir) { 1083 case IPSEC_DIR_INBOUND: 1084 pcb_sp = &inp->inp_sp->sp_in; 1085 break; 1086 case IPSEC_DIR_OUTBOUND: 1087 pcb_sp = &inp->inp_sp->sp_out; 1088 break; 1089 default: 1090 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1091 xpl->sadb_x_policy_dir)); 1092 return EINVAL; 1093 } 1094 1095 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1096 } 1097 1098 int 1099 ipsec4_get_policy(inp, request, len, mp) 1100 struct inpcb *inp; 1101 caddr_t request; 1102 size_t len; 1103 struct mbuf **mp; 1104 { 1105 struct sadb_x_policy *xpl; 1106 struct secpolicy *pcb_sp; 1107 1108 /* sanity check. */ 1109 if (inp == NULL || request == NULL || mp == NULL) 1110 return EINVAL; 1111 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1112 if (len < sizeof(*xpl)) 1113 return EINVAL; 1114 xpl = (struct sadb_x_policy *)request; 1115 1116 /* select direction */ 1117 switch (xpl->sadb_x_policy_dir) { 1118 case IPSEC_DIR_INBOUND: 1119 pcb_sp = inp->inp_sp->sp_in; 1120 break; 1121 case IPSEC_DIR_OUTBOUND: 1122 pcb_sp = inp->inp_sp->sp_out; 1123 break; 1124 default: 1125 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1126 xpl->sadb_x_policy_dir)); 1127 return EINVAL; 1128 } 1129 1130 return ipsec_get_policy(pcb_sp, mp); 1131 } 1132 1133 /* delete policy in PCB */ 1134 int 1135 ipsec4_delete_pcbpolicy(inp) 1136 struct inpcb *inp; 1137 { 1138 IPSEC_ASSERT(inp != NULL, ("null inp")); 1139 1140 if (inp->inp_sp == NULL) 1141 return 0; 1142 1143 if (inp->inp_sp->sp_in != NULL) 1144 KEY_FREESP(&inp->inp_sp->sp_in); 1145 1146 if (inp->inp_sp->sp_out != NULL) 1147 KEY_FREESP(&inp->inp_sp->sp_out); 1148 1149 ipsec_delpcbpolicy(inp->inp_sp); 1150 inp->inp_sp = NULL; 1151 1152 return 0; 1153 } 1154 1155 #ifdef INET6 1156 int 1157 ipsec6_set_policy(in6p, optname, request, len, priv) 1158 struct in6pcb *in6p; 1159 int optname; 1160 caddr_t request; 1161 size_t len; 1162 int priv; 1163 { 1164 struct sadb_x_policy *xpl; 1165 struct secpolicy **pcb_sp; 1166 1167 /* sanity check. */ 1168 if (in6p == NULL || request == NULL) 1169 return EINVAL; 1170 if (len < sizeof(*xpl)) 1171 return EINVAL; 1172 xpl = (struct sadb_x_policy *)request; 1173 1174 /* select direction */ 1175 switch (xpl->sadb_x_policy_dir) { 1176 case IPSEC_DIR_INBOUND: 1177 pcb_sp = &in6p->in6p_sp->sp_in; 1178 break; 1179 case IPSEC_DIR_OUTBOUND: 1180 pcb_sp = &in6p->in6p_sp->sp_out; 1181 break; 1182 default: 1183 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1184 xpl->sadb_x_policy_dir)); 1185 return EINVAL; 1186 } 1187 1188 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1189 } 1190 1191 int 1192 ipsec6_get_policy(in6p, request, len, mp) 1193 struct in6pcb *in6p; 1194 caddr_t request; 1195 size_t len; 1196 struct mbuf **mp; 1197 { 1198 struct sadb_x_policy *xpl; 1199 struct secpolicy *pcb_sp; 1200 1201 /* sanity check. */ 1202 if (in6p == NULL || request == NULL || mp == NULL) 1203 return EINVAL; 1204 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1205 if (len < sizeof(*xpl)) 1206 return EINVAL; 1207 xpl = (struct sadb_x_policy *)request; 1208 1209 /* select direction */ 1210 switch (xpl->sadb_x_policy_dir) { 1211 case IPSEC_DIR_INBOUND: 1212 pcb_sp = in6p->in6p_sp->sp_in; 1213 break; 1214 case IPSEC_DIR_OUTBOUND: 1215 pcb_sp = in6p->in6p_sp->sp_out; 1216 break; 1217 default: 1218 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1219 xpl->sadb_x_policy_dir)); 1220 return EINVAL; 1221 } 1222 1223 return ipsec_get_policy(pcb_sp, mp); 1224 } 1225 1226 int 1227 ipsec6_delete_pcbpolicy(in6p) 1228 struct in6pcb *in6p; 1229 { 1230 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1231 1232 if (in6p->in6p_sp == NULL) 1233 return 0; 1234 1235 if (in6p->in6p_sp->sp_in != NULL) 1236 KEY_FREESP(&in6p->in6p_sp->sp_in); 1237 1238 if (in6p->in6p_sp->sp_out != NULL) 1239 KEY_FREESP(&in6p->in6p_sp->sp_out); 1240 1241 ipsec_delpcbpolicy(in6p->in6p_sp); 1242 in6p->in6p_sp = NULL; 1243 1244 return 0; 1245 } 1246 #endif 1247 1248 /* 1249 * return current level. 1250 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1251 */ 1252 u_int 1253 ipsec_get_reqlevel(isr) 1254 struct ipsecrequest *isr; 1255 { 1256 u_int level = 0; 1257 u_int esp_trans_deflev, esp_net_deflev; 1258 u_int ah_trans_deflev, ah_net_deflev; 1259 1260 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1261 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1262 ("af family mismatch, src %u, dst %u", 1263 isr->sp->spidx.src.sa.sa_family, 1264 isr->sp->spidx.dst.sa.sa_family)); 1265 1266 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1267 #define IPSEC_CHECK_DEFAULT(lev) \ 1268 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1269 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1270 ? (ipsec_debug \ 1271 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1272 (lev), IPSEC_LEVEL_REQUIRE) \ 1273 : 0), \ 1274 (lev) = IPSEC_LEVEL_REQUIRE, \ 1275 (lev) \ 1276 : (lev)) 1277 1278 /* set default level */ 1279 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1280 #ifdef INET 1281 case AF_INET: 1282 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1283 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1284 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1285 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1286 break; 1287 #endif 1288 #ifdef INET6 1289 case AF_INET6: 1290 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1291 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1292 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1293 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1294 break; 1295 #endif /* INET6 */ 1296 default: 1297 panic("%s: unknown af %u", 1298 __func__, isr->sp->spidx.src.sa.sa_family); 1299 } 1300 1301 #undef IPSEC_CHECK_DEFAULT 1302 1303 /* set level */ 1304 switch (isr->level) { 1305 case IPSEC_LEVEL_DEFAULT: 1306 switch (isr->saidx.proto) { 1307 case IPPROTO_ESP: 1308 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1309 level = esp_net_deflev; 1310 else 1311 level = esp_trans_deflev; 1312 break; 1313 case IPPROTO_AH: 1314 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1315 level = ah_net_deflev; 1316 else 1317 level = ah_trans_deflev; 1318 break; 1319 case IPPROTO_IPCOMP: 1320 /* 1321 * we don't really care, as IPcomp document says that 1322 * we shouldn't compress small packets 1323 */ 1324 level = IPSEC_LEVEL_USE; 1325 break; 1326 default: 1327 panic("%s: Illegal protocol defined %u\n", __func__, 1328 isr->saidx.proto); 1329 } 1330 break; 1331 1332 case IPSEC_LEVEL_USE: 1333 case IPSEC_LEVEL_REQUIRE: 1334 level = isr->level; 1335 break; 1336 case IPSEC_LEVEL_UNIQUE: 1337 level = IPSEC_LEVEL_REQUIRE; 1338 break; 1339 1340 default: 1341 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1342 } 1343 1344 return level; 1345 } 1346 1347 /* 1348 * Check security policy requirements against the actual 1349 * packet contents. Return one if the packet should be 1350 * reject as "invalid"; otherwiser return zero to have the 1351 * packet treated as "valid". 1352 * 1353 * OUT: 1354 * 0: valid 1355 * 1: invalid 1356 */ 1357 int 1358 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1359 { 1360 struct ipsecrequest *isr; 1361 int need_auth; 1362 1363 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1364 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1365 1366 /* check policy */ 1367 switch (sp->policy) { 1368 case IPSEC_POLICY_DISCARD: 1369 return 1; 1370 case IPSEC_POLICY_BYPASS: 1371 case IPSEC_POLICY_NONE: 1372 return 0; 1373 } 1374 1375 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1376 ("invalid policy %u", sp->policy)); 1377 1378 /* XXX should compare policy against ipsec header history */ 1379 1380 need_auth = 0; 1381 for (isr = sp->req; isr != NULL; isr = isr->next) { 1382 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1383 continue; 1384 switch (isr->saidx.proto) { 1385 case IPPROTO_ESP: 1386 if ((m->m_flags & M_DECRYPTED) == 0) { 1387 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1388 printf("%s: ESP m_flags:%x\n", __func__, 1389 m->m_flags)); 1390 return 1; 1391 } 1392 1393 if (!need_auth && 1394 isr->sav != NULL && 1395 isr->sav->tdb_authalgxform != NULL && 1396 (m->m_flags & M_AUTHIPDGM) == 0) { 1397 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1398 printf("%s: ESP/AH m_flags:%x\n", __func__, 1399 m->m_flags)); 1400 return 1; 1401 } 1402 break; 1403 case IPPROTO_AH: 1404 need_auth = 1; 1405 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1406 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1407 printf("%s: AH m_flags:%x\n", __func__, 1408 m->m_flags)); 1409 return 1; 1410 } 1411 break; 1412 case IPPROTO_IPCOMP: 1413 /* 1414 * we don't really care, as IPcomp document 1415 * says that we shouldn't compress small 1416 * packets, IPComp policy should always be 1417 * treated as being in "use" level. 1418 */ 1419 break; 1420 } 1421 } 1422 return 0; /* valid */ 1423 } 1424 1425 /* 1426 * Check AH/ESP integrity. 1427 * This function is called from tcp_input(), udp_input(), 1428 * and {ah,esp}4_input for tunnel mode 1429 */ 1430 int 1431 ipsec4_in_reject(m, inp) 1432 struct mbuf *m; 1433 struct inpcb *inp; 1434 { 1435 struct secpolicy *sp; 1436 int error; 1437 int result; 1438 1439 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1440 1441 /* get SP for this packet. 1442 * When we are called from ip_forward(), we call 1443 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1444 */ 1445 if (inp == NULL) 1446 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1447 else 1448 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1449 1450 if (sp != NULL) { 1451 result = ipsec_in_reject(sp, m); 1452 if (result) 1453 newipsecstat.ips_in_polvio++; 1454 KEY_FREESP(&sp); 1455 } else { 1456 result = 0; /* XXX should be panic ? 1457 * -> No, there may be error. */ 1458 } 1459 return result; 1460 } 1461 1462 #ifdef INET6 1463 /* 1464 * Check AH/ESP integrity. 1465 * This function is called from tcp6_input(), udp6_input(), 1466 * and {ah,esp}6_input for tunnel mode 1467 */ 1468 int 1469 ipsec6_in_reject(m, inp) 1470 struct mbuf *m; 1471 struct inpcb *inp; 1472 { 1473 struct secpolicy *sp = NULL; 1474 int error; 1475 int result; 1476 1477 /* sanity check */ 1478 if (m == NULL) 1479 return 0; /* XXX should be panic ? */ 1480 1481 /* get SP for this packet. 1482 * When we are called from ip_forward(), we call 1483 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1484 */ 1485 if (inp == NULL) 1486 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1487 else 1488 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1489 1490 if (sp != NULL) { 1491 result = ipsec_in_reject(sp, m); 1492 if (result) 1493 newipsecstat.ips_in_polvio++; 1494 KEY_FREESP(&sp); 1495 } else { 1496 result = 0; 1497 } 1498 return result; 1499 } 1500 #endif 1501 1502 /* 1503 * compute the byte size to be occupied by IPsec header. 1504 * in case it is tunneled, it includes the size of outer IP header. 1505 * NOTE: SP passed is free in this function. 1506 */ 1507 static size_t 1508 ipsec_hdrsiz(struct secpolicy *sp) 1509 { 1510 struct ipsecrequest *isr; 1511 size_t siz; 1512 1513 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1514 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1515 1516 switch (sp->policy) { 1517 case IPSEC_POLICY_DISCARD: 1518 case IPSEC_POLICY_BYPASS: 1519 case IPSEC_POLICY_NONE: 1520 return 0; 1521 } 1522 1523 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1524 ("invalid policy %u", sp->policy)); 1525 1526 siz = 0; 1527 for (isr = sp->req; isr != NULL; isr = isr->next) { 1528 size_t clen = 0; 1529 1530 switch (isr->saidx.proto) { 1531 case IPPROTO_ESP: 1532 clen = esp_hdrsiz(isr->sav); 1533 break; 1534 case IPPROTO_AH: 1535 clen = ah_hdrsiz(isr->sav); 1536 break; 1537 case IPPROTO_IPCOMP: 1538 clen = sizeof(struct ipcomp); 1539 break; 1540 } 1541 1542 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1543 switch (isr->saidx.dst.sa.sa_family) { 1544 case AF_INET: 1545 clen += sizeof(struct ip); 1546 break; 1547 #ifdef INET6 1548 case AF_INET6: 1549 clen += sizeof(struct ip6_hdr); 1550 break; 1551 #endif 1552 default: 1553 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1554 "IPsec tunnel SA\n", __func__, 1555 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1556 break; 1557 } 1558 } 1559 siz += clen; 1560 } 1561 1562 return siz; 1563 } 1564 1565 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1566 size_t 1567 ipsec4_hdrsiz(m, dir, inp) 1568 struct mbuf *m; 1569 u_int dir; 1570 struct inpcb *inp; 1571 { 1572 struct secpolicy *sp; 1573 int error; 1574 size_t size; 1575 1576 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1577 1578 /* get SP for this packet. 1579 * When we are called from ip_forward(), we call 1580 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1581 */ 1582 if (inp == NULL) 1583 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1584 else 1585 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1586 1587 if (sp != NULL) { 1588 size = ipsec_hdrsiz(sp); 1589 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1590 printf("%s: size:%lu.\n", __func__, 1591 (unsigned long)size)); 1592 1593 KEY_FREESP(&sp); 1594 } else { 1595 size = 0; /* XXX should be panic ? */ 1596 } 1597 return size; 1598 } 1599 1600 #ifdef INET6 1601 /* This function is called from ipsec6_hdrsize_tcp(), 1602 * and maybe from ip6_forward.() 1603 */ 1604 size_t 1605 ipsec6_hdrsiz(m, dir, in6p) 1606 struct mbuf *m; 1607 u_int dir; 1608 struct in6pcb *in6p; 1609 { 1610 struct secpolicy *sp; 1611 int error; 1612 size_t size; 1613 1614 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1615 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1616 ("socket w/o inpcb")); 1617 1618 /* get SP for this packet */ 1619 /* XXX Is it right to call with IP_FORWARDING. */ 1620 if (in6p == NULL) 1621 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1622 else 1623 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1624 1625 if (sp == NULL) 1626 return 0; 1627 size = ipsec_hdrsiz(sp); 1628 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1629 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1630 KEY_FREESP(&sp); 1631 1632 return size; 1633 } 1634 #endif /*INET6*/ 1635 1636 /* 1637 * Check the variable replay window. 1638 * ipsec_chkreplay() performs replay check before ICV verification. 1639 * ipsec_updatereplay() updates replay bitmap. This must be called after 1640 * ICV verification (it also performs replay check, which is usually done 1641 * beforehand). 1642 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1643 * 1644 * based on RFC 2401. 1645 */ 1646 int 1647 ipsec_chkreplay(seq, sav) 1648 u_int32_t seq; 1649 struct secasvar *sav; 1650 { 1651 const struct secreplay *replay; 1652 u_int32_t diff; 1653 int fr; 1654 u_int32_t wsizeb; /* constant: bits of window size */ 1655 int frlast; /* constant: last frame */ 1656 1657 IPSEC_SPLASSERT_SOFTNET(__func__); 1658 1659 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1660 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1661 1662 replay = sav->replay; 1663 1664 if (replay->wsize == 0) 1665 return 1; /* no need to check replay. */ 1666 1667 /* constant */ 1668 frlast = replay->wsize - 1; 1669 wsizeb = replay->wsize << 3; 1670 1671 /* sequence number of 0 is invalid */ 1672 if (seq == 0) 1673 return 0; 1674 1675 /* first time is always okay */ 1676 if (replay->count == 0) 1677 return 1; 1678 1679 if (seq > replay->lastseq) { 1680 /* larger sequences are okay */ 1681 return 1; 1682 } else { 1683 /* seq is equal or less than lastseq. */ 1684 diff = replay->lastseq - seq; 1685 1686 /* over range to check, i.e. too old or wrapped */ 1687 if (diff >= wsizeb) 1688 return 0; 1689 1690 fr = frlast - diff / 8; 1691 1692 /* this packet already seen ? */ 1693 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1694 return 0; 1695 1696 /* out of order but good */ 1697 return 1; 1698 } 1699 } 1700 1701 /* 1702 * check replay counter whether to update or not. 1703 * OUT: 0: OK 1704 * 1: NG 1705 */ 1706 int 1707 ipsec_updatereplay(seq, sav) 1708 u_int32_t seq; 1709 struct secasvar *sav; 1710 { 1711 struct secreplay *replay; 1712 u_int32_t diff; 1713 int fr; 1714 u_int32_t wsizeb; /* constant: bits of window size */ 1715 int frlast; /* constant: last frame */ 1716 1717 IPSEC_SPLASSERT_SOFTNET(__func__); 1718 1719 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1720 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1721 1722 replay = sav->replay; 1723 1724 if (replay->wsize == 0) 1725 goto ok; /* no need to check replay. */ 1726 1727 /* constant */ 1728 frlast = replay->wsize - 1; 1729 wsizeb = replay->wsize << 3; 1730 1731 /* sequence number of 0 is invalid */ 1732 if (seq == 0) 1733 return 1; 1734 1735 /* first time */ 1736 if (replay->count == 0) { 1737 replay->lastseq = seq; 1738 bzero(replay->bitmap, replay->wsize); 1739 (replay->bitmap)[frlast] = 1; 1740 goto ok; 1741 } 1742 1743 if (seq > replay->lastseq) { 1744 /* seq is larger than lastseq. */ 1745 diff = seq - replay->lastseq; 1746 1747 /* new larger sequence number */ 1748 if (diff < wsizeb) { 1749 /* In window */ 1750 /* set bit for this packet */ 1751 vshiftl(replay->bitmap, diff, replay->wsize); 1752 (replay->bitmap)[frlast] |= 1; 1753 } else { 1754 /* this packet has a "way larger" */ 1755 bzero(replay->bitmap, replay->wsize); 1756 (replay->bitmap)[frlast] = 1; 1757 } 1758 replay->lastseq = seq; 1759 1760 /* larger is good */ 1761 } else { 1762 /* seq is equal or less than lastseq. */ 1763 diff = replay->lastseq - seq; 1764 1765 /* over range to check, i.e. too old or wrapped */ 1766 if (diff >= wsizeb) 1767 return 1; 1768 1769 fr = frlast - diff / 8; 1770 1771 /* this packet already seen ? */ 1772 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1773 return 1; 1774 1775 /* mark as seen */ 1776 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1777 1778 /* out of order but good */ 1779 } 1780 1781 ok: 1782 if (replay->count == ~0) { 1783 1784 /* set overflow flag */ 1785 replay->overflow++; 1786 1787 /* don't increment, no more packets accepted */ 1788 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1789 return 1; 1790 1791 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1792 __func__, replay->overflow, ipsec_logsastr(sav))); 1793 } 1794 1795 replay->count++; 1796 1797 return 0; 1798 } 1799 1800 /* 1801 * shift variable length buffer to left. 1802 * IN: bitmap: pointer to the buffer 1803 * nbit: the number of to shift. 1804 * wsize: buffer size (bytes). 1805 */ 1806 static void 1807 vshiftl(bitmap, nbit, wsize) 1808 unsigned char *bitmap; 1809 int nbit, wsize; 1810 { 1811 int s, j, i; 1812 unsigned char over; 1813 1814 for (j = 0; j < nbit; j += 8) { 1815 s = (nbit - j < 8) ? (nbit - j): 8; 1816 bitmap[0] <<= s; 1817 for (i = 1; i < wsize; i++) { 1818 over = (bitmap[i] >> (8 - s)); 1819 bitmap[i] <<= s; 1820 bitmap[i-1] |= over; 1821 } 1822 } 1823 1824 return; 1825 } 1826 1827 /* Return a printable string for the IPv4 address. */ 1828 static char * 1829 inet_ntoa4(struct in_addr ina) 1830 { 1831 static char buf[4][4 * sizeof "123" + 4]; 1832 unsigned char *ucp = (unsigned char *) &ina; 1833 static int i = 3; 1834 1835 /* XXX-BZ returns static buffer. */ 1836 i = (i + 1) % 4; 1837 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1838 ucp[2] & 0xff, ucp[3] & 0xff); 1839 return (buf[i]); 1840 } 1841 1842 /* Return a printable string for the address. */ 1843 char * 1844 ipsec_address(union sockaddr_union* sa) 1845 { 1846 #ifdef INET6 1847 char ip6buf[INET6_ADDRSTRLEN]; 1848 #endif 1849 switch (sa->sa.sa_family) { 1850 #ifdef INET 1851 case AF_INET: 1852 return inet_ntoa4(sa->sin.sin_addr); 1853 #endif /* INET */ 1854 1855 #ifdef INET6 1856 case AF_INET6: 1857 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1858 #endif /* INET6 */ 1859 1860 default: 1861 return "(unknown address family)"; 1862 } 1863 } 1864 1865 const char * 1866 ipsec_logsastr(sav) 1867 struct secasvar *sav; 1868 { 1869 static char buf[256]; 1870 char *p; 1871 struct secasindex *saidx = &sav->sah->saidx; 1872 1873 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1874 ("address family mismatch")); 1875 1876 p = buf; 1877 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1878 while (p && *p) 1879 p++; 1880 /* NB: only use ipsec_address on one address at a time */ 1881 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1882 ipsec_address(&saidx->src)); 1883 while (p && *p) 1884 p++; 1885 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1886 ipsec_address(&saidx->dst)); 1887 1888 return buf; 1889 } 1890 1891 void 1892 ipsec_dumpmbuf(m) 1893 struct mbuf *m; 1894 { 1895 int totlen; 1896 int i; 1897 u_char *p; 1898 1899 totlen = 0; 1900 printf("---\n"); 1901 while (m) { 1902 p = mtod(m, u_char *); 1903 for (i = 0; i < m->m_len; i++) { 1904 printf("%02x ", p[i]); 1905 totlen++; 1906 if (totlen % 16 == 0) 1907 printf("\n"); 1908 } 1909 m = m->m_next; 1910 } 1911 if (totlen % 16 != 0) 1912 printf("\n"); 1913 printf("---\n"); 1914 } 1915 1916 static void 1917 ipsec_attach(void) 1918 { 1919 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1920 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1921 } 1922 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1923 1924 1925 /* XXX this stuff doesn't belong here... */ 1926 1927 static struct xformsw* xforms = NULL; 1928 1929 /* 1930 * Register a transform; typically at system startup. 1931 */ 1932 void 1933 xform_register(struct xformsw* xsp) 1934 { 1935 xsp->xf_next = xforms; 1936 xforms = xsp; 1937 } 1938 1939 /* 1940 * Initialize transform support in an sav. 1941 */ 1942 int 1943 xform_init(struct secasvar *sav, int xftype) 1944 { 1945 struct xformsw *xsp; 1946 1947 if (sav->tdb_xform != NULL) /* previously initialized */ 1948 return 0; 1949 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1950 if (xsp->xf_type == xftype) 1951 return (*xsp->xf_init)(sav, xsp); 1952 return EINVAL; 1953 } 1954