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 #include <opencrypto/cryptodev.h> 97 98 #ifdef IPSEC_DEBUG 99 int ipsec_debug = 1; 100 #else 101 int ipsec_debug = 0; 102 #endif 103 104 /* NB: name changed so netstat doesn't use it */ 105 struct newipsecstat newipsecstat; 106 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 107 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 108 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 109 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 110 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 111 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 112 struct secpolicy ip4_def_policy; 113 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 114 int ip4_esp_randpad = -1; 115 /* 116 * Crypto support requirements: 117 * 118 * 1 require hardware support 119 * -1 require software support 120 * 0 take anything 121 */ 122 int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 123 124 SYSCTL_DECL(_net_inet_ipsec); 125 126 /* net.inet.ipsec */ 127 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 128 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 129 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 130 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 131 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 132 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 133 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 134 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 135 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 136 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 137 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 138 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 139 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 140 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 141 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 142 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 143 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 144 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 145 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 146 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 147 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 148 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 149 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 150 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 151 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 152 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 153 154 #ifdef REGRESSION 155 /* 156 * When set to 1, IPsec will send packets with the same sequence number. 157 * This allows to verify if the other side has proper replay attacks detection. 158 */ 159 int ipsec_replay = 0; 160 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 161 "Emulate replay attack"); 162 /* 163 * When set 1, IPsec will send packets with corrupted HMAC. 164 * This allows to verify if the other side properly detects modified packets. 165 */ 166 int ipsec_integrity = 0; 167 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 168 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 169 #endif 170 171 #ifdef INET6 172 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 173 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 174 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 175 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 176 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 177 int ip6_esp_randpad = -1; 178 179 SYSCTL_DECL(_net_inet6_ipsec6); 180 181 /* net.inet6.ipsec6 */ 182 #ifdef COMPAT_KAME 183 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 184 0,0, compat_ipsecstats_sysctl, "S", ""); 185 #endif /* COMPAT_KAME */ 186 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 187 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 189 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 191 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 193 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 195 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 197 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 199 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 201 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 202 #endif /* INET6 */ 203 204 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 205 #ifdef INET6 206 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 207 #endif 208 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 209 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 210 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 211 #ifdef INET6 212 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 213 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 214 #endif 215 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 216 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 217 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 218 int optname, caddr_t request, size_t len, int priv)); 219 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 220 static void vshiftl __P((unsigned char *, int, int)); 221 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 222 223 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 224 225 /* 226 * Return a held reference to the default SP. 227 */ 228 static struct secpolicy * 229 key_allocsp_default(const char* where, int tag) 230 { 231 struct secpolicy *sp; 232 233 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 234 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 235 236 sp = &ip4_def_policy; 237 if (sp->policy != IPSEC_POLICY_DISCARD && 238 sp->policy != IPSEC_POLICY_NONE) { 239 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 240 sp->policy, IPSEC_POLICY_NONE)); 241 sp->policy = IPSEC_POLICY_NONE; 242 } 243 key_addref(sp); 244 245 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 246 printf("DP key_allocsp_default returns SP:%p (%u)\n", 247 sp, sp->refcnt)); 248 return sp; 249 } 250 #define KEY_ALLOCSP_DEFAULT() \ 251 key_allocsp_default(__FILE__, __LINE__) 252 253 /* 254 * For OUTBOUND packet having a socket. Searching SPD for packet, 255 * and return a pointer to SP. 256 * OUT: NULL: no apropreate SP found, the following value is set to error. 257 * 0 : bypass 258 * EACCES : discard packet. 259 * ENOENT : ipsec_acquire() in progress, maybe. 260 * others : error occured. 261 * others: a pointer to SP 262 * 263 * NOTE: IPv6 mapped adddress concern is implemented here. 264 */ 265 struct secpolicy * 266 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 267 { 268 struct secpolicy *sp; 269 270 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 271 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 272 ("invalid direction %u", dir)); 273 274 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 275 if (sp == NULL) /*XXX????*/ 276 sp = KEY_ALLOCSP_DEFAULT(); 277 IPSEC_ASSERT(sp != NULL, ("null SP")); 278 return sp; 279 } 280 281 /* 282 * For OUTBOUND packet having a socket. Searching SPD for packet, 283 * and return a pointer to SP. 284 * OUT: NULL: no apropreate SP found, the following value is set to error. 285 * 0 : bypass 286 * EACCES : discard packet. 287 * ENOENT : ipsec_acquire() in progress, maybe. 288 * others : error occured. 289 * others: a pointer to SP 290 * 291 * NOTE: IPv6 mapped adddress concern is implemented here. 292 */ 293 struct secpolicy * 294 ipsec_getpolicybysock(m, dir, inp, error) 295 struct mbuf *m; 296 u_int dir; 297 struct inpcb *inp; 298 int *error; 299 { 300 struct inpcbpolicy *pcbsp = NULL; 301 struct secpolicy *currsp = NULL; /* policy on socket */ 302 struct secpolicy *sp; 303 304 IPSEC_ASSERT(m != NULL, ("null mbuf")); 305 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 306 IPSEC_ASSERT(error != NULL, ("null error")); 307 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 308 ("invalid direction %u", dir)); 309 310 /* set spidx in pcb */ 311 if (inp->inp_vflag & INP_IPV6PROTO) { 312 #ifdef INET6 313 *error = ipsec6_setspidx_in6pcb(m, inp); 314 pcbsp = inp->in6p_sp; 315 #else 316 *error = EINVAL; /* should not happen */ 317 #endif 318 } else { 319 *error = ipsec4_setspidx_inpcb(m, inp); 320 pcbsp = inp->inp_sp; 321 } 322 if (*error) 323 return NULL; 324 325 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 326 switch (dir) { 327 case IPSEC_DIR_INBOUND: 328 currsp = pcbsp->sp_in; 329 break; 330 case IPSEC_DIR_OUTBOUND: 331 currsp = pcbsp->sp_out; 332 break; 333 } 334 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 335 336 if (pcbsp->priv) { /* when privilieged socket */ 337 switch (currsp->policy) { 338 case IPSEC_POLICY_BYPASS: 339 case IPSEC_POLICY_IPSEC: 340 key_addref(currsp); 341 sp = currsp; 342 break; 343 344 case IPSEC_POLICY_ENTRUST: 345 /* look for a policy in SPD */ 346 sp = KEY_ALLOCSP(&currsp->spidx, dir); 347 if (sp == NULL) /* no SP found */ 348 sp = KEY_ALLOCSP_DEFAULT(); 349 break; 350 351 default: 352 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 353 __func__, currsp->policy)); 354 *error = EINVAL; 355 return NULL; 356 } 357 } else { /* unpriv, SPD has policy */ 358 sp = KEY_ALLOCSP(&currsp->spidx, dir); 359 if (sp == NULL) { /* no SP found */ 360 switch (currsp->policy) { 361 case IPSEC_POLICY_BYPASS: 362 ipseclog((LOG_ERR, "%s: Illegal policy for " 363 "non-priviliged defined %d\n", 364 __func__, currsp->policy)); 365 *error = EINVAL; 366 return NULL; 367 368 case IPSEC_POLICY_ENTRUST: 369 sp = KEY_ALLOCSP_DEFAULT(); 370 break; 371 372 case IPSEC_POLICY_IPSEC: 373 key_addref(currsp); 374 sp = currsp; 375 break; 376 377 default: 378 ipseclog((LOG_ERR, "%s: Invalid policy for " 379 "PCB %d\n", __func__, currsp->policy)); 380 *error = EINVAL; 381 return NULL; 382 } 383 } 384 } 385 IPSEC_ASSERT(sp != NULL, 386 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 387 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 388 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 389 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 390 return sp; 391 } 392 393 /* 394 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 395 * and return a pointer to SP. 396 * OUT: positive: a pointer to the entry for security policy leaf matched. 397 * NULL: no apropreate SP found, the following value is set to error. 398 * 0 : bypass 399 * EACCES : discard packet. 400 * ENOENT : ipsec_acquire() in progress, maybe. 401 * others : error occured. 402 */ 403 struct secpolicy * 404 ipsec_getpolicybyaddr(m, dir, flag, error) 405 struct mbuf *m; 406 u_int dir; 407 int flag; 408 int *error; 409 { 410 struct secpolicyindex spidx; 411 struct secpolicy *sp; 412 413 IPSEC_ASSERT(m != NULL, ("null mbuf")); 414 IPSEC_ASSERT(error != NULL, ("null error")); 415 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 416 ("invalid direction %u", dir)); 417 418 sp = NULL; 419 if (key_havesp(dir)) { 420 /* Make an index to look for a policy. */ 421 *error = ipsec_setspidx(m, &spidx, 422 (flag & IP_FORWARDING) ? 0 : 1); 423 if (*error != 0) { 424 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 425 __func__, dir, flag)); 426 return NULL; 427 } 428 spidx.dir = dir; 429 430 sp = KEY_ALLOCSP(&spidx, dir); 431 } 432 if (sp == NULL) /* no SP found, use system default */ 433 sp = KEY_ALLOCSP_DEFAULT(); 434 IPSEC_ASSERT(sp != NULL, ("null SP")); 435 return sp; 436 } 437 438 struct secpolicy * 439 ipsec4_checkpolicy(m, dir, flag, error, inp) 440 struct mbuf *m; 441 u_int dir, flag; 442 int *error; 443 struct inpcb *inp; 444 { 445 struct secpolicy *sp; 446 447 *error = 0; 448 if (inp == NULL) 449 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 450 else 451 sp = ipsec_getpolicybysock(m, dir, inp, error); 452 if (sp == NULL) { 453 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 454 newipsecstat.ips_out_inval++; 455 return NULL; 456 } 457 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 458 switch (sp->policy) { 459 case IPSEC_POLICY_ENTRUST: 460 default: 461 printf("%s: invalid policy %u\n", __func__, sp->policy); 462 /* fall thru... */ 463 case IPSEC_POLICY_DISCARD: 464 newipsecstat.ips_out_polvio++; 465 *error = -EINVAL; /* packet is discarded by caller */ 466 break; 467 case IPSEC_POLICY_BYPASS: 468 case IPSEC_POLICY_NONE: 469 KEY_FREESP(&sp); 470 sp = NULL; /* NB: force NULL result */ 471 break; 472 case IPSEC_POLICY_IPSEC: 473 if (sp->req == NULL) /* acquire an SA */ 474 *error = key_spdacquire(sp); 475 break; 476 } 477 if (*error != 0) { 478 KEY_FREESP(&sp); 479 sp = NULL; 480 } 481 return sp; 482 } 483 484 static int 485 ipsec4_setspidx_inpcb(m, pcb) 486 struct mbuf *m; 487 struct inpcb *pcb; 488 { 489 int error; 490 491 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 492 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 493 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 494 ("null sp_in || sp_out")); 495 496 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 497 if (error == 0) { 498 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 499 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 500 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 501 } else { 502 bzero(&pcb->inp_sp->sp_in->spidx, 503 sizeof (pcb->inp_sp->sp_in->spidx)); 504 bzero(&pcb->inp_sp->sp_out->spidx, 505 sizeof (pcb->inp_sp->sp_in->spidx)); 506 } 507 return error; 508 } 509 510 #ifdef INET6 511 static int 512 ipsec6_setspidx_in6pcb(m, pcb) 513 struct mbuf *m; 514 struct in6pcb *pcb; 515 { 516 struct secpolicyindex *spidx; 517 int error; 518 519 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 520 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 521 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 522 ("null sp_in || sp_out")); 523 524 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 525 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 526 527 spidx = &pcb->in6p_sp->sp_in->spidx; 528 error = ipsec_setspidx(m, spidx, 1); 529 if (error) 530 goto bad; 531 spidx->dir = IPSEC_DIR_INBOUND; 532 533 spidx = &pcb->in6p_sp->sp_out->spidx; 534 error = ipsec_setspidx(m, spidx, 1); 535 if (error) 536 goto bad; 537 spidx->dir = IPSEC_DIR_OUTBOUND; 538 539 return 0; 540 541 bad: 542 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 543 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 544 return error; 545 } 546 #endif 547 548 /* 549 * configure security policy index (src/dst/proto/sport/dport) 550 * by looking at the content of mbuf. 551 * the caller is responsible for error recovery (like clearing up spidx). 552 */ 553 static int 554 ipsec_setspidx(m, spidx, needport) 555 struct mbuf *m; 556 struct secpolicyindex *spidx; 557 int needport; 558 { 559 struct ip *ip = NULL; 560 struct ip ipbuf; 561 u_int v; 562 struct mbuf *n; 563 int len; 564 int error; 565 566 IPSEC_ASSERT(m != NULL, ("null mbuf")); 567 568 /* 569 * validate m->m_pkthdr.len. we see incorrect length if we 570 * mistakenly call this function with inconsistent mbuf chain 571 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 572 */ 573 len = 0; 574 for (n = m; n; n = n->m_next) 575 len += n->m_len; 576 if (m->m_pkthdr.len != len) { 577 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 578 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 579 __func__, len, m->m_pkthdr.len)); 580 return EINVAL; 581 } 582 583 if (m->m_pkthdr.len < sizeof(struct ip)) { 584 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 585 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 586 __func__, m->m_pkthdr.len)); 587 return EINVAL; 588 } 589 590 if (m->m_len >= sizeof(*ip)) 591 ip = mtod(m, struct ip *); 592 else { 593 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 594 ip = &ipbuf; 595 } 596 #ifdef _IP_VHL 597 v = _IP_VHL_V(ip->ip_vhl); 598 #else 599 v = ip->ip_v; 600 #endif 601 switch (v) { 602 case 4: 603 error = ipsec4_setspidx_ipaddr(m, spidx); 604 if (error) 605 return error; 606 ipsec4_get_ulp(m, spidx, needport); 607 return 0; 608 #ifdef INET6 609 case 6: 610 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 611 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 612 printf("%s: pkthdr len(%d) too small (v6), " 613 "ignored\n", __func__, m->m_pkthdr.len)); 614 return EINVAL; 615 } 616 error = ipsec6_setspidx_ipaddr(m, spidx); 617 if (error) 618 return error; 619 ipsec6_get_ulp(m, spidx, needport); 620 return 0; 621 #endif 622 default: 623 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 624 printf("%s: " "unknown IP version %u, ignored.\n", 625 __func__, v)); 626 return EINVAL; 627 } 628 } 629 630 static void 631 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 632 { 633 u_int8_t nxt; 634 int off; 635 636 /* sanity check */ 637 IPSEC_ASSERT(m != NULL, ("null mbuf")); 638 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 639 640 /* NB: ip_input() flips it into host endian XXX need more checking */ 641 if (m->m_len < sizeof (struct ip)) { 642 struct ip *ip = mtod(m, struct ip *); 643 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 644 goto done; 645 #ifdef _IP_VHL 646 off = _IP_VHL_HL(ip->ip_vhl) << 2; 647 #else 648 off = ip->ip_hl << 2; 649 #endif 650 nxt = ip->ip_p; 651 } else { 652 struct ip ih; 653 654 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 655 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 656 goto done; 657 #ifdef _IP_VHL 658 off = _IP_VHL_HL(ih.ip_vhl) << 2; 659 #else 660 off = ih.ip_hl << 2; 661 #endif 662 nxt = ih.ip_p; 663 } 664 665 while (off < m->m_pkthdr.len) { 666 struct ip6_ext ip6e; 667 struct tcphdr th; 668 struct udphdr uh; 669 670 switch (nxt) { 671 case IPPROTO_TCP: 672 spidx->ul_proto = nxt; 673 if (!needport) 674 goto done_proto; 675 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 676 goto done; 677 m_copydata(m, off, sizeof (th), (caddr_t) &th); 678 spidx->src.sin.sin_port = th.th_sport; 679 spidx->dst.sin.sin_port = th.th_dport; 680 return; 681 case IPPROTO_UDP: 682 spidx->ul_proto = nxt; 683 if (!needport) 684 goto done_proto; 685 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 686 goto done; 687 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 688 spidx->src.sin.sin_port = uh.uh_sport; 689 spidx->dst.sin.sin_port = uh.uh_dport; 690 return; 691 case IPPROTO_AH: 692 if (off + sizeof(ip6e) > m->m_pkthdr.len) 693 goto done; 694 /* XXX sigh, this works but is totally bogus */ 695 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 696 off += (ip6e.ip6e_len + 2) << 2; 697 nxt = ip6e.ip6e_nxt; 698 break; 699 case IPPROTO_ICMP: 700 default: 701 /* XXX intermediate headers??? */ 702 spidx->ul_proto = nxt; 703 goto done_proto; 704 } 705 } 706 done: 707 spidx->ul_proto = IPSEC_ULPROTO_ANY; 708 done_proto: 709 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 710 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 711 } 712 713 /* assumes that m is sane */ 714 static int 715 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 716 { 717 static const struct sockaddr_in template = { 718 sizeof (struct sockaddr_in), 719 AF_INET, 720 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 721 }; 722 723 spidx->src.sin = template; 724 spidx->dst.sin = template; 725 726 if (m->m_len < sizeof (struct ip)) { 727 m_copydata(m, offsetof(struct ip, ip_src), 728 sizeof (struct in_addr), 729 (caddr_t) &spidx->src.sin.sin_addr); 730 m_copydata(m, offsetof(struct ip, ip_dst), 731 sizeof (struct in_addr), 732 (caddr_t) &spidx->dst.sin.sin_addr); 733 } else { 734 struct ip *ip = mtod(m, struct ip *); 735 spidx->src.sin.sin_addr = ip->ip_src; 736 spidx->dst.sin.sin_addr = ip->ip_dst; 737 } 738 739 spidx->prefs = sizeof(struct in_addr) << 3; 740 spidx->prefd = sizeof(struct in_addr) << 3; 741 742 return 0; 743 } 744 745 #ifdef INET6 746 static void 747 ipsec6_get_ulp(m, spidx, needport) 748 struct mbuf *m; 749 struct secpolicyindex *spidx; 750 int needport; 751 { 752 int off, nxt; 753 struct tcphdr th; 754 struct udphdr uh; 755 struct icmp6_hdr ih; 756 757 /* sanity check */ 758 if (m == NULL) 759 panic("%s: NULL pointer was passed.\n", __func__); 760 761 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 762 printf("%s:\n", __func__); kdebug_mbuf(m)); 763 764 /* set default */ 765 spidx->ul_proto = IPSEC_ULPROTO_ANY; 766 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 767 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 768 769 nxt = -1; 770 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 771 if (off < 0 || m->m_pkthdr.len < off) 772 return; 773 774 switch (nxt) { 775 case IPPROTO_TCP: 776 spidx->ul_proto = nxt; 777 if (!needport) 778 break; 779 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 780 break; 781 m_copydata(m, off, sizeof(th), (caddr_t)&th); 782 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 783 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 784 break; 785 case IPPROTO_UDP: 786 spidx->ul_proto = nxt; 787 if (!needport) 788 break; 789 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 790 break; 791 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 792 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 793 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 794 break; 795 case IPPROTO_ICMPV6: 796 spidx->ul_proto = nxt; 797 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 798 break; 799 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 800 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 801 htons((uint16_t)ih.icmp6_type); 802 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 803 htons((uint16_t)ih.icmp6_code); 804 break; 805 default: 806 /* XXX intermediate headers??? */ 807 spidx->ul_proto = nxt; 808 break; 809 } 810 } 811 812 /* assumes that m is sane */ 813 static int 814 ipsec6_setspidx_ipaddr(m, spidx) 815 struct mbuf *m; 816 struct secpolicyindex *spidx; 817 { 818 struct ip6_hdr *ip6 = NULL; 819 struct ip6_hdr ip6buf; 820 struct sockaddr_in6 *sin6; 821 822 if (m->m_len >= sizeof(*ip6)) 823 ip6 = mtod(m, struct ip6_hdr *); 824 else { 825 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 826 ip6 = &ip6buf; 827 } 828 829 sin6 = (struct sockaddr_in6 *)&spidx->src; 830 bzero(sin6, sizeof(*sin6)); 831 sin6->sin6_family = AF_INET6; 832 sin6->sin6_len = sizeof(struct sockaddr_in6); 833 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 834 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 835 sin6->sin6_addr.s6_addr16[1] = 0; 836 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 837 } 838 spidx->prefs = sizeof(struct in6_addr) << 3; 839 840 sin6 = (struct sockaddr_in6 *)&spidx->dst; 841 bzero(sin6, sizeof(*sin6)); 842 sin6->sin6_family = AF_INET6; 843 sin6->sin6_len = sizeof(struct sockaddr_in6); 844 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 845 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 846 sin6->sin6_addr.s6_addr16[1] = 0; 847 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 848 } 849 spidx->prefd = sizeof(struct in6_addr) << 3; 850 851 return 0; 852 } 853 #endif 854 855 static void 856 ipsec_delpcbpolicy(p) 857 struct inpcbpolicy *p; 858 { 859 free(p, M_IPSEC_INPCB); 860 } 861 862 /* initialize policy in PCB */ 863 int 864 ipsec_init_policy(so, pcb_sp) 865 struct socket *so; 866 struct inpcbpolicy **pcb_sp; 867 { 868 struct inpcbpolicy *new; 869 870 /* sanity check. */ 871 if (so == NULL || pcb_sp == NULL) 872 panic("%s: NULL pointer was passed.\n", __func__); 873 874 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 875 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 876 if (new == NULL) { 877 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 878 return ENOBUFS; 879 } 880 881 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 882 883 if ((new->sp_in = KEY_NEWSP()) == NULL) { 884 ipsec_delpcbpolicy(new); 885 return ENOBUFS; 886 } 887 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 888 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 889 890 if ((new->sp_out = KEY_NEWSP()) == NULL) { 891 KEY_FREESP(&new->sp_in); 892 ipsec_delpcbpolicy(new); 893 return ENOBUFS; 894 } 895 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 896 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 897 898 *pcb_sp = new; 899 900 return 0; 901 } 902 903 /* copy old ipsec policy into new */ 904 int 905 ipsec_copy_policy(old, new) 906 struct inpcbpolicy *old, *new; 907 { 908 struct secpolicy *sp; 909 910 sp = ipsec_deepcopy_policy(old->sp_in); 911 if (sp) { 912 KEY_FREESP(&new->sp_in); 913 new->sp_in = sp; 914 } else 915 return ENOBUFS; 916 917 sp = ipsec_deepcopy_policy(old->sp_out); 918 if (sp) { 919 KEY_FREESP(&new->sp_out); 920 new->sp_out = sp; 921 } else 922 return ENOBUFS; 923 924 new->priv = old->priv; 925 926 return 0; 927 } 928 929 struct ipsecrequest * 930 ipsec_newisr(void) 931 { 932 struct ipsecrequest *p; 933 934 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 935 if (p != NULL) 936 IPSECREQUEST_LOCK_INIT(p); 937 return p; 938 } 939 940 void 941 ipsec_delisr(struct ipsecrequest *p) 942 { 943 IPSECREQUEST_LOCK_DESTROY(p); 944 free(p, M_IPSEC_SR); 945 } 946 947 /* deep-copy a policy in PCB */ 948 static struct secpolicy * 949 ipsec_deepcopy_policy(src) 950 struct secpolicy *src; 951 { 952 struct ipsecrequest *newchain = NULL; 953 struct ipsecrequest *p; 954 struct ipsecrequest **q; 955 struct ipsecrequest *r; 956 struct secpolicy *dst; 957 958 if (src == NULL) 959 return NULL; 960 dst = KEY_NEWSP(); 961 if (dst == NULL) 962 return NULL; 963 964 /* 965 * deep-copy IPsec request chain. This is required since struct 966 * ipsecrequest is not reference counted. 967 */ 968 q = &newchain; 969 for (p = src->req; p; p = p->next) { 970 *q = ipsec_newisr(); 971 if (*q == NULL) 972 goto fail; 973 (*q)->saidx.proto = p->saidx.proto; 974 (*q)->saidx.mode = p->saidx.mode; 975 (*q)->level = p->level; 976 (*q)->saidx.reqid = p->saidx.reqid; 977 978 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 979 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 980 981 (*q)->sp = dst; 982 983 q = &((*q)->next); 984 } 985 986 dst->req = newchain; 987 dst->state = src->state; 988 dst->policy = src->policy; 989 /* do not touch the refcnt fields */ 990 991 return dst; 992 993 fail: 994 for (p = newchain; p; p = r) { 995 r = p->next; 996 ipsec_delisr(p); 997 p = NULL; 998 } 999 return NULL; 1000 } 1001 1002 /* set policy and ipsec request if present. */ 1003 static int 1004 ipsec_set_policy(pcb_sp, optname, request, len, priv) 1005 struct secpolicy **pcb_sp; 1006 int optname; 1007 caddr_t request; 1008 size_t len; 1009 int priv; 1010 { 1011 struct sadb_x_policy *xpl; 1012 struct secpolicy *newsp = NULL; 1013 int error; 1014 1015 /* sanity check. */ 1016 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1017 return EINVAL; 1018 if (len < sizeof(*xpl)) 1019 return EINVAL; 1020 xpl = (struct sadb_x_policy *)request; 1021 1022 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1023 printf("%s: passed policy\n", __func__); 1024 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1025 1026 /* check policy type */ 1027 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1028 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1029 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1030 return EINVAL; 1031 1032 /* check privileged socket */ 1033 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1034 return EACCES; 1035 1036 /* allocation new SP entry */ 1037 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1038 return error; 1039 1040 newsp->state = IPSEC_SPSTATE_ALIVE; 1041 1042 /* clear old SP and set new SP */ 1043 KEY_FREESP(pcb_sp); 1044 *pcb_sp = newsp; 1045 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1046 printf("%s: new policy\n", __func__); 1047 kdebug_secpolicy(newsp)); 1048 1049 return 0; 1050 } 1051 1052 static int 1053 ipsec_get_policy(pcb_sp, mp) 1054 struct secpolicy *pcb_sp; 1055 struct mbuf **mp; 1056 { 1057 1058 /* sanity check. */ 1059 if (pcb_sp == NULL || mp == NULL) 1060 return EINVAL; 1061 1062 *mp = key_sp2msg(pcb_sp); 1063 if (!*mp) { 1064 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1065 return ENOBUFS; 1066 } 1067 1068 (*mp)->m_type = MT_DATA; 1069 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1070 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1071 1072 return 0; 1073 } 1074 1075 int 1076 ipsec4_set_policy(inp, optname, request, len, priv) 1077 struct inpcb *inp; 1078 int optname; 1079 caddr_t request; 1080 size_t len; 1081 int priv; 1082 { 1083 struct sadb_x_policy *xpl; 1084 struct secpolicy **pcb_sp; 1085 1086 /* sanity check. */ 1087 if (inp == NULL || request == NULL) 1088 return EINVAL; 1089 if (len < sizeof(*xpl)) 1090 return EINVAL; 1091 xpl = (struct sadb_x_policy *)request; 1092 1093 /* select direction */ 1094 switch (xpl->sadb_x_policy_dir) { 1095 case IPSEC_DIR_INBOUND: 1096 pcb_sp = &inp->inp_sp->sp_in; 1097 break; 1098 case IPSEC_DIR_OUTBOUND: 1099 pcb_sp = &inp->inp_sp->sp_out; 1100 break; 1101 default: 1102 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1103 xpl->sadb_x_policy_dir)); 1104 return EINVAL; 1105 } 1106 1107 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1108 } 1109 1110 int 1111 ipsec4_get_policy(inp, request, len, mp) 1112 struct inpcb *inp; 1113 caddr_t request; 1114 size_t len; 1115 struct mbuf **mp; 1116 { 1117 struct sadb_x_policy *xpl; 1118 struct secpolicy *pcb_sp; 1119 1120 /* sanity check. */ 1121 if (inp == NULL || request == NULL || mp == NULL) 1122 return EINVAL; 1123 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1124 if (len < sizeof(*xpl)) 1125 return EINVAL; 1126 xpl = (struct sadb_x_policy *)request; 1127 1128 /* select direction */ 1129 switch (xpl->sadb_x_policy_dir) { 1130 case IPSEC_DIR_INBOUND: 1131 pcb_sp = inp->inp_sp->sp_in; 1132 break; 1133 case IPSEC_DIR_OUTBOUND: 1134 pcb_sp = inp->inp_sp->sp_out; 1135 break; 1136 default: 1137 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1138 xpl->sadb_x_policy_dir)); 1139 return EINVAL; 1140 } 1141 1142 return ipsec_get_policy(pcb_sp, mp); 1143 } 1144 1145 /* delete policy in PCB */ 1146 int 1147 ipsec4_delete_pcbpolicy(inp) 1148 struct inpcb *inp; 1149 { 1150 IPSEC_ASSERT(inp != NULL, ("null inp")); 1151 1152 if (inp->inp_sp == NULL) 1153 return 0; 1154 1155 if (inp->inp_sp->sp_in != NULL) 1156 KEY_FREESP(&inp->inp_sp->sp_in); 1157 1158 if (inp->inp_sp->sp_out != NULL) 1159 KEY_FREESP(&inp->inp_sp->sp_out); 1160 1161 ipsec_delpcbpolicy(inp->inp_sp); 1162 inp->inp_sp = NULL; 1163 1164 return 0; 1165 } 1166 1167 #ifdef INET6 1168 int 1169 ipsec6_set_policy(in6p, optname, request, len, priv) 1170 struct in6pcb *in6p; 1171 int optname; 1172 caddr_t request; 1173 size_t len; 1174 int priv; 1175 { 1176 struct sadb_x_policy *xpl; 1177 struct secpolicy **pcb_sp; 1178 1179 /* sanity check. */ 1180 if (in6p == NULL || request == NULL) 1181 return EINVAL; 1182 if (len < sizeof(*xpl)) 1183 return EINVAL; 1184 xpl = (struct sadb_x_policy *)request; 1185 1186 /* select direction */ 1187 switch (xpl->sadb_x_policy_dir) { 1188 case IPSEC_DIR_INBOUND: 1189 pcb_sp = &in6p->in6p_sp->sp_in; 1190 break; 1191 case IPSEC_DIR_OUTBOUND: 1192 pcb_sp = &in6p->in6p_sp->sp_out; 1193 break; 1194 default: 1195 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1196 xpl->sadb_x_policy_dir)); 1197 return EINVAL; 1198 } 1199 1200 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1201 } 1202 1203 int 1204 ipsec6_get_policy(in6p, request, len, mp) 1205 struct in6pcb *in6p; 1206 caddr_t request; 1207 size_t len; 1208 struct mbuf **mp; 1209 { 1210 struct sadb_x_policy *xpl; 1211 struct secpolicy *pcb_sp; 1212 1213 /* sanity check. */ 1214 if (in6p == NULL || request == NULL || mp == NULL) 1215 return EINVAL; 1216 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1217 if (len < sizeof(*xpl)) 1218 return EINVAL; 1219 xpl = (struct sadb_x_policy *)request; 1220 1221 /* select direction */ 1222 switch (xpl->sadb_x_policy_dir) { 1223 case IPSEC_DIR_INBOUND: 1224 pcb_sp = in6p->in6p_sp->sp_in; 1225 break; 1226 case IPSEC_DIR_OUTBOUND: 1227 pcb_sp = in6p->in6p_sp->sp_out; 1228 break; 1229 default: 1230 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1231 xpl->sadb_x_policy_dir)); 1232 return EINVAL; 1233 } 1234 1235 return ipsec_get_policy(pcb_sp, mp); 1236 } 1237 1238 int 1239 ipsec6_delete_pcbpolicy(in6p) 1240 struct in6pcb *in6p; 1241 { 1242 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1243 1244 if (in6p->in6p_sp == NULL) 1245 return 0; 1246 1247 if (in6p->in6p_sp->sp_in != NULL) 1248 KEY_FREESP(&in6p->in6p_sp->sp_in); 1249 1250 if (in6p->in6p_sp->sp_out != NULL) 1251 KEY_FREESP(&in6p->in6p_sp->sp_out); 1252 1253 ipsec_delpcbpolicy(in6p->in6p_sp); 1254 in6p->in6p_sp = NULL; 1255 1256 return 0; 1257 } 1258 #endif 1259 1260 /* 1261 * return current level. 1262 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1263 */ 1264 u_int 1265 ipsec_get_reqlevel(isr) 1266 struct ipsecrequest *isr; 1267 { 1268 u_int level = 0; 1269 u_int esp_trans_deflev, esp_net_deflev; 1270 u_int ah_trans_deflev, ah_net_deflev; 1271 1272 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1273 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1274 ("af family mismatch, src %u, dst %u", 1275 isr->sp->spidx.src.sa.sa_family, 1276 isr->sp->spidx.dst.sa.sa_family)); 1277 1278 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1279 #define IPSEC_CHECK_DEFAULT(lev) \ 1280 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1281 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1282 ? (ipsec_debug \ 1283 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1284 (lev), IPSEC_LEVEL_REQUIRE) \ 1285 : 0), \ 1286 (lev) = IPSEC_LEVEL_REQUIRE, \ 1287 (lev) \ 1288 : (lev)) 1289 1290 /* set default level */ 1291 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1292 #ifdef INET 1293 case AF_INET: 1294 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1295 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1296 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1297 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1298 break; 1299 #endif 1300 #ifdef INET6 1301 case AF_INET6: 1302 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1303 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1304 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1305 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1306 break; 1307 #endif /* INET6 */ 1308 default: 1309 panic("%s: unknown af %u", 1310 __func__, isr->sp->spidx.src.sa.sa_family); 1311 } 1312 1313 #undef IPSEC_CHECK_DEFAULT 1314 1315 /* set level */ 1316 switch (isr->level) { 1317 case IPSEC_LEVEL_DEFAULT: 1318 switch (isr->saidx.proto) { 1319 case IPPROTO_ESP: 1320 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1321 level = esp_net_deflev; 1322 else 1323 level = esp_trans_deflev; 1324 break; 1325 case IPPROTO_AH: 1326 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1327 level = ah_net_deflev; 1328 else 1329 level = ah_trans_deflev; 1330 break; 1331 case IPPROTO_IPCOMP: 1332 /* 1333 * we don't really care, as IPcomp document says that 1334 * we shouldn't compress small packets 1335 */ 1336 level = IPSEC_LEVEL_USE; 1337 break; 1338 default: 1339 panic("%s: Illegal protocol defined %u\n", __func__, 1340 isr->saidx.proto); 1341 } 1342 break; 1343 1344 case IPSEC_LEVEL_USE: 1345 case IPSEC_LEVEL_REQUIRE: 1346 level = isr->level; 1347 break; 1348 case IPSEC_LEVEL_UNIQUE: 1349 level = IPSEC_LEVEL_REQUIRE; 1350 break; 1351 1352 default: 1353 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1354 } 1355 1356 return level; 1357 } 1358 1359 /* 1360 * Check security policy requirements against the actual 1361 * packet contents. Return one if the packet should be 1362 * reject as "invalid"; otherwiser return zero to have the 1363 * packet treated as "valid". 1364 * 1365 * OUT: 1366 * 0: valid 1367 * 1: invalid 1368 */ 1369 int 1370 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1371 { 1372 struct ipsecrequest *isr; 1373 int need_auth; 1374 1375 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1376 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1377 1378 /* check policy */ 1379 switch (sp->policy) { 1380 case IPSEC_POLICY_DISCARD: 1381 return 1; 1382 case IPSEC_POLICY_BYPASS: 1383 case IPSEC_POLICY_NONE: 1384 return 0; 1385 } 1386 1387 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1388 ("invalid policy %u", sp->policy)); 1389 1390 /* XXX should compare policy against ipsec header history */ 1391 1392 need_auth = 0; 1393 for (isr = sp->req; isr != NULL; isr = isr->next) { 1394 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1395 continue; 1396 switch (isr->saidx.proto) { 1397 case IPPROTO_ESP: 1398 if ((m->m_flags & M_DECRYPTED) == 0) { 1399 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1400 printf("%s: ESP m_flags:%x\n", __func__, 1401 m->m_flags)); 1402 return 1; 1403 } 1404 1405 if (!need_auth && 1406 isr->sav != NULL && 1407 isr->sav->tdb_authalgxform != NULL && 1408 (m->m_flags & M_AUTHIPDGM) == 0) { 1409 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1410 printf("%s: ESP/AH m_flags:%x\n", __func__, 1411 m->m_flags)); 1412 return 1; 1413 } 1414 break; 1415 case IPPROTO_AH: 1416 need_auth = 1; 1417 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1418 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1419 printf("%s: AH m_flags:%x\n", __func__, 1420 m->m_flags)); 1421 return 1; 1422 } 1423 break; 1424 case IPPROTO_IPCOMP: 1425 /* 1426 * we don't really care, as IPcomp document 1427 * says that we shouldn't compress small 1428 * packets, IPComp policy should always be 1429 * treated as being in "use" level. 1430 */ 1431 break; 1432 } 1433 } 1434 return 0; /* valid */ 1435 } 1436 1437 /* 1438 * Check AH/ESP integrity. 1439 * This function is called from tcp_input(), udp_input(), 1440 * and {ah,esp}4_input for tunnel mode 1441 */ 1442 int 1443 ipsec4_in_reject(m, inp) 1444 struct mbuf *m; 1445 struct inpcb *inp; 1446 { 1447 struct secpolicy *sp; 1448 int error; 1449 int result; 1450 1451 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1452 1453 /* get SP for this packet. 1454 * When we are called from ip_forward(), we call 1455 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1456 */ 1457 if (inp == NULL) 1458 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1459 else 1460 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1461 1462 if (sp != NULL) { 1463 result = ipsec_in_reject(sp, m); 1464 if (result) 1465 newipsecstat.ips_in_polvio++; 1466 KEY_FREESP(&sp); 1467 } else { 1468 result = 0; /* XXX should be panic ? 1469 * -> No, there may be error. */ 1470 } 1471 return result; 1472 } 1473 1474 #ifdef INET6 1475 /* 1476 * Check AH/ESP integrity. 1477 * This function is called from tcp6_input(), udp6_input(), 1478 * and {ah,esp}6_input for tunnel mode 1479 */ 1480 int 1481 ipsec6_in_reject(m, inp) 1482 struct mbuf *m; 1483 struct inpcb *inp; 1484 { 1485 struct secpolicy *sp = NULL; 1486 int error; 1487 int result; 1488 1489 /* sanity check */ 1490 if (m == NULL) 1491 return 0; /* XXX should be panic ? */ 1492 1493 /* get SP for this packet. 1494 * When we are called from ip_forward(), we call 1495 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1496 */ 1497 if (inp == NULL) 1498 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1499 else 1500 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1501 1502 if (sp != NULL) { 1503 result = ipsec_in_reject(sp, m); 1504 if (result) 1505 newipsecstat.ips_in_polvio++; 1506 KEY_FREESP(&sp); 1507 } else { 1508 result = 0; 1509 } 1510 return result; 1511 } 1512 #endif 1513 1514 /* 1515 * compute the byte size to be occupied by IPsec header. 1516 * in case it is tunneled, it includes the size of outer IP header. 1517 * NOTE: SP passed is free in this function. 1518 */ 1519 static size_t 1520 ipsec_hdrsiz(struct secpolicy *sp) 1521 { 1522 struct ipsecrequest *isr; 1523 size_t siz; 1524 1525 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1526 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1527 1528 switch (sp->policy) { 1529 case IPSEC_POLICY_DISCARD: 1530 case IPSEC_POLICY_BYPASS: 1531 case IPSEC_POLICY_NONE: 1532 return 0; 1533 } 1534 1535 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1536 ("invalid policy %u", sp->policy)); 1537 1538 siz = 0; 1539 for (isr = sp->req; isr != NULL; isr = isr->next) { 1540 size_t clen = 0; 1541 1542 switch (isr->saidx.proto) { 1543 case IPPROTO_ESP: 1544 clen = esp_hdrsiz(isr->sav); 1545 break; 1546 case IPPROTO_AH: 1547 clen = ah_hdrsiz(isr->sav); 1548 break; 1549 case IPPROTO_IPCOMP: 1550 clen = sizeof(struct ipcomp); 1551 break; 1552 } 1553 1554 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1555 switch (isr->saidx.dst.sa.sa_family) { 1556 case AF_INET: 1557 clen += sizeof(struct ip); 1558 break; 1559 #ifdef INET6 1560 case AF_INET6: 1561 clen += sizeof(struct ip6_hdr); 1562 break; 1563 #endif 1564 default: 1565 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1566 "IPsec tunnel SA\n", __func__, 1567 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1568 break; 1569 } 1570 } 1571 siz += clen; 1572 } 1573 1574 return siz; 1575 } 1576 1577 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1578 size_t 1579 ipsec4_hdrsiz(m, dir, inp) 1580 struct mbuf *m; 1581 u_int dir; 1582 struct inpcb *inp; 1583 { 1584 struct secpolicy *sp; 1585 int error; 1586 size_t size; 1587 1588 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1589 1590 /* get SP for this packet. 1591 * When we are called from ip_forward(), we call 1592 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1593 */ 1594 if (inp == NULL) 1595 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1596 else 1597 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1598 1599 if (sp != NULL) { 1600 size = ipsec_hdrsiz(sp); 1601 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1602 printf("%s: size:%lu.\n", __func__, 1603 (unsigned long)size)); 1604 1605 KEY_FREESP(&sp); 1606 } else { 1607 size = 0; /* XXX should be panic ? */ 1608 } 1609 return size; 1610 } 1611 1612 #ifdef INET6 1613 /* This function is called from ipsec6_hdrsize_tcp(), 1614 * and maybe from ip6_forward.() 1615 */ 1616 size_t 1617 ipsec6_hdrsiz(m, dir, in6p) 1618 struct mbuf *m; 1619 u_int dir; 1620 struct in6pcb *in6p; 1621 { 1622 struct secpolicy *sp; 1623 int error; 1624 size_t size; 1625 1626 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1627 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1628 ("socket w/o inpcb")); 1629 1630 /* get SP for this packet */ 1631 /* XXX Is it right to call with IP_FORWARDING. */ 1632 if (in6p == NULL) 1633 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1634 else 1635 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1636 1637 if (sp == NULL) 1638 return 0; 1639 size = ipsec_hdrsiz(sp); 1640 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1641 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1642 KEY_FREESP(&sp); 1643 1644 return size; 1645 } 1646 #endif /*INET6*/ 1647 1648 /* 1649 * Check the variable replay window. 1650 * ipsec_chkreplay() performs replay check before ICV verification. 1651 * ipsec_updatereplay() updates replay bitmap. This must be called after 1652 * ICV verification (it also performs replay check, which is usually done 1653 * beforehand). 1654 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1655 * 1656 * based on RFC 2401. 1657 */ 1658 int 1659 ipsec_chkreplay(seq, sav) 1660 u_int32_t seq; 1661 struct secasvar *sav; 1662 { 1663 const struct secreplay *replay; 1664 u_int32_t diff; 1665 int fr; 1666 u_int32_t wsizeb; /* constant: bits of window size */ 1667 int frlast; /* constant: last frame */ 1668 1669 IPSEC_SPLASSERT_SOFTNET(__func__); 1670 1671 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1672 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1673 1674 replay = sav->replay; 1675 1676 if (replay->wsize == 0) 1677 return 1; /* no need to check replay. */ 1678 1679 /* constant */ 1680 frlast = replay->wsize - 1; 1681 wsizeb = replay->wsize << 3; 1682 1683 /* sequence number of 0 is invalid */ 1684 if (seq == 0) 1685 return 0; 1686 1687 /* first time is always okay */ 1688 if (replay->count == 0) 1689 return 1; 1690 1691 if (seq > replay->lastseq) { 1692 /* larger sequences are okay */ 1693 return 1; 1694 } else { 1695 /* seq is equal or less than lastseq. */ 1696 diff = replay->lastseq - seq; 1697 1698 /* over range to check, i.e. too old or wrapped */ 1699 if (diff >= wsizeb) 1700 return 0; 1701 1702 fr = frlast - diff / 8; 1703 1704 /* this packet already seen ? */ 1705 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1706 return 0; 1707 1708 /* out of order but good */ 1709 return 1; 1710 } 1711 } 1712 1713 /* 1714 * check replay counter whether to update or not. 1715 * OUT: 0: OK 1716 * 1: NG 1717 */ 1718 int 1719 ipsec_updatereplay(seq, sav) 1720 u_int32_t seq; 1721 struct secasvar *sav; 1722 { 1723 struct secreplay *replay; 1724 u_int32_t diff; 1725 int fr; 1726 u_int32_t wsizeb; /* constant: bits of window size */ 1727 int frlast; /* constant: last frame */ 1728 1729 IPSEC_SPLASSERT_SOFTNET(__func__); 1730 1731 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1732 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1733 1734 replay = sav->replay; 1735 1736 if (replay->wsize == 0) 1737 goto ok; /* no need to check replay. */ 1738 1739 /* constant */ 1740 frlast = replay->wsize - 1; 1741 wsizeb = replay->wsize << 3; 1742 1743 /* sequence number of 0 is invalid */ 1744 if (seq == 0) 1745 return 1; 1746 1747 /* first time */ 1748 if (replay->count == 0) { 1749 replay->lastseq = seq; 1750 bzero(replay->bitmap, replay->wsize); 1751 (replay->bitmap)[frlast] = 1; 1752 goto ok; 1753 } 1754 1755 if (seq > replay->lastseq) { 1756 /* seq is larger than lastseq. */ 1757 diff = seq - replay->lastseq; 1758 1759 /* new larger sequence number */ 1760 if (diff < wsizeb) { 1761 /* In window */ 1762 /* set bit for this packet */ 1763 vshiftl(replay->bitmap, diff, replay->wsize); 1764 (replay->bitmap)[frlast] |= 1; 1765 } else { 1766 /* this packet has a "way larger" */ 1767 bzero(replay->bitmap, replay->wsize); 1768 (replay->bitmap)[frlast] = 1; 1769 } 1770 replay->lastseq = seq; 1771 1772 /* larger is good */ 1773 } else { 1774 /* seq is equal or less than lastseq. */ 1775 diff = replay->lastseq - seq; 1776 1777 /* over range to check, i.e. too old or wrapped */ 1778 if (diff >= wsizeb) 1779 return 1; 1780 1781 fr = frlast - diff / 8; 1782 1783 /* this packet already seen ? */ 1784 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1785 return 1; 1786 1787 /* mark as seen */ 1788 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1789 1790 /* out of order but good */ 1791 } 1792 1793 ok: 1794 if (replay->count == ~0) { 1795 1796 /* set overflow flag */ 1797 replay->overflow++; 1798 1799 /* don't increment, no more packets accepted */ 1800 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1801 return 1; 1802 1803 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1804 __func__, replay->overflow, ipsec_logsastr(sav))); 1805 } 1806 1807 replay->count++; 1808 1809 return 0; 1810 } 1811 1812 /* 1813 * shift variable length buffer to left. 1814 * IN: bitmap: pointer to the buffer 1815 * nbit: the number of to shift. 1816 * wsize: buffer size (bytes). 1817 */ 1818 static void 1819 vshiftl(bitmap, nbit, wsize) 1820 unsigned char *bitmap; 1821 int nbit, wsize; 1822 { 1823 int s, j, i; 1824 unsigned char over; 1825 1826 for (j = 0; j < nbit; j += 8) { 1827 s = (nbit - j < 8) ? (nbit - j): 8; 1828 bitmap[0] <<= s; 1829 for (i = 1; i < wsize; i++) { 1830 over = (bitmap[i] >> (8 - s)); 1831 bitmap[i] <<= s; 1832 bitmap[i-1] |= over; 1833 } 1834 } 1835 1836 return; 1837 } 1838 1839 /* Return a printable string for the IPv4 address. */ 1840 static char * 1841 inet_ntoa4(struct in_addr ina) 1842 { 1843 static char buf[4][4 * sizeof "123" + 4]; 1844 unsigned char *ucp = (unsigned char *) &ina; 1845 static int i = 3; 1846 1847 /* XXX-BZ returns static buffer. */ 1848 i = (i + 1) % 4; 1849 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1850 ucp[2] & 0xff, ucp[3] & 0xff); 1851 return (buf[i]); 1852 } 1853 1854 /* Return a printable string for the address. */ 1855 char * 1856 ipsec_address(union sockaddr_union* sa) 1857 { 1858 #ifdef INET6 1859 char ip6buf[INET6_ADDRSTRLEN]; 1860 #endif 1861 switch (sa->sa.sa_family) { 1862 #ifdef INET 1863 case AF_INET: 1864 return inet_ntoa4(sa->sin.sin_addr); 1865 #endif /* INET */ 1866 1867 #ifdef INET6 1868 case AF_INET6: 1869 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1870 #endif /* INET6 */ 1871 1872 default: 1873 return "(unknown address family)"; 1874 } 1875 } 1876 1877 const char * 1878 ipsec_logsastr(sav) 1879 struct secasvar *sav; 1880 { 1881 static char buf[256]; 1882 char *p; 1883 struct secasindex *saidx = &sav->sah->saidx; 1884 1885 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1886 ("address family mismatch")); 1887 1888 p = buf; 1889 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1890 while (p && *p) 1891 p++; 1892 /* NB: only use ipsec_address on one address at a time */ 1893 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1894 ipsec_address(&saidx->src)); 1895 while (p && *p) 1896 p++; 1897 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1898 ipsec_address(&saidx->dst)); 1899 1900 return buf; 1901 } 1902 1903 void 1904 ipsec_dumpmbuf(m) 1905 struct mbuf *m; 1906 { 1907 int totlen; 1908 int i; 1909 u_char *p; 1910 1911 totlen = 0; 1912 printf("---\n"); 1913 while (m) { 1914 p = mtod(m, u_char *); 1915 for (i = 0; i < m->m_len; i++) { 1916 printf("%02x ", p[i]); 1917 totlen++; 1918 if (totlen % 16 == 0) 1919 printf("\n"); 1920 } 1921 m = m->m_next; 1922 } 1923 if (totlen % 16 != 0) 1924 printf("\n"); 1925 printf("---\n"); 1926 } 1927 1928 static void 1929 ipsec_attach(void) 1930 { 1931 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1932 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1933 } 1934 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1935 1936 1937 /* XXX this stuff doesn't belong here... */ 1938 1939 static struct xformsw* xforms = NULL; 1940 1941 /* 1942 * Register a transform; typically at system startup. 1943 */ 1944 void 1945 xform_register(struct xformsw* xsp) 1946 { 1947 xsp->xf_next = xforms; 1948 xforms = xsp; 1949 } 1950 1951 /* 1952 * Initialize transform support in an sav. 1953 */ 1954 int 1955 xform_init(struct secasvar *sav, int xftype) 1956 { 1957 struct xformsw *xsp; 1958 1959 if (sav->tdb_xform != NULL) /* previously initialized */ 1960 return 0; 1961 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1962 if (xsp->xf_type == xftype) 1963 return (*xsp->xf_init)(sav, xsp); 1964 return EINVAL; 1965 } 1966