Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/ipsec.c
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1 /* $FreeBSD$ */ 2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * IPsec controller part. 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/priv.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/proc.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 60 #include <netinet/in.h> 61 #include <netinet/in_systm.h> 62 #include <netinet/ip.h> 63 #include <netinet/ip_var.h> 64 #include <netinet/in_var.h> 65 #include <netinet/udp.h> 66 #include <netinet/udp_var.h> 67 #include <netinet/tcp.h> 68 #include <netinet/udp.h> 69 70 #include <netinet/ip6.h> 71 #ifdef INET6 72 #include <netinet6/ip6_var.h> 73 #endif 74 #include <netinet/in_pcb.h> 75 #ifdef INET6 76 #include <netinet/icmp6.h> 77 #endif 78 79 #include <sys/types.h> 80 #include <netipsec/ipsec.h> 81 #ifdef INET6 82 #include <netipsec/ipsec6.h> 83 #endif 84 #include <netipsec/ah_var.h> 85 #include <netipsec/esp_var.h> 86 #include <netipsec/ipcomp.h> /*XXX*/ 87 #include <netipsec/ipcomp_var.h> 88 89 #include <netipsec/key.h> 90 #include <netipsec/keydb.h> 91 #include <netipsec/key_debug.h> 92 93 #include <netipsec/xform.h> 94 95 #include <machine/in_cksum.h> 96 97 #include <opencrypto/cryptodev.h> 98 99 #ifdef IPSEC_DEBUG 100 int ipsec_debug = 1; 101 #else 102 int ipsec_debug = 0; 103 #endif 104 105 /* NB: name changed so netstat doesn't use it */ 106 struct ipsecstat ipsec4stat; 107 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 108 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 109 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 110 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 111 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 112 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 113 struct secpolicy ip4_def_policy; 114 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 115 int ip4_esp_randpad = -1; 116 /* 117 * Crypto support requirements: 118 * 119 * 1 require hardware support 120 * -1 require software support 121 * 0 take anything 122 */ 123 int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 124 125 SYSCTL_DECL(_net_inet_ipsec); 126 127 /* net.inet.ipsec */ 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 129 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 131 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 133 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 135 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 137 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 139 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 141 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 143 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 145 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 147 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 148 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 149 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 150 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 151 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 152 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 153 ipsecstats, CTLFLAG_RD, &ipsec4stat, ipsecstat, ""); 154 155 #ifdef REGRESSION 156 /* 157 * When set to 1, IPsec will send packets with the same sequence number. 158 * This allows to verify if the other side has proper replay attacks detection. 159 */ 160 int ipsec_replay = 0; 161 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 162 "Emulate replay attack"); 163 /* 164 * When set 1, IPsec will send packets with corrupted HMAC. 165 * This allows to verify if the other side properly detects modified packets. 166 */ 167 int ipsec_integrity = 0; 168 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 169 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 170 #endif 171 172 #ifdef INET6 173 struct ipsecstat ipsec6stat; 174 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 175 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 176 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 177 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 178 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 179 int ip6_esp_randpad = -1; 180 181 SYSCTL_DECL(_net_inet6_ipsec6); 182 183 /* net.inet6.ipsec6 */ 184 #ifdef COMPAT_KAME 185 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 186 0,0, compat_ipsecstats_sysctl, "S", ""); 187 #endif /* COMPAT_KAME */ 188 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 189 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 190 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 191 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 192 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 193 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 194 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 195 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 196 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 197 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 198 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 199 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 200 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 201 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 202 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 203 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 204 SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS, 205 ipsecstats, CTLFLAG_RD, &ipsec6stat, ipsecstat, ""); 206 #endif /* INET6 */ 207 208 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 209 #ifdef INET6 210 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 211 #endif 212 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 213 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 214 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 215 #ifdef INET6 216 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 217 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 218 #endif 219 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 220 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 221 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 222 int optname, caddr_t request, size_t len, struct ucred *cred)); 223 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 224 static void vshiftl __P((unsigned char *, int, int)); 225 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 226 227 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 228 229 /* 230 * Return a held reference to the default SP. 231 */ 232 static struct secpolicy * 233 key_allocsp_default(const char* where, int tag) 234 { 235 struct secpolicy *sp; 236 237 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 238 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 239 240 sp = &ip4_def_policy; 241 if (sp->policy != IPSEC_POLICY_DISCARD && 242 sp->policy != IPSEC_POLICY_NONE) { 243 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 244 sp->policy, IPSEC_POLICY_NONE)); 245 sp->policy = IPSEC_POLICY_NONE; 246 } 247 key_addref(sp); 248 249 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 250 printf("DP key_allocsp_default returns SP:%p (%u)\n", 251 sp, sp->refcnt)); 252 return sp; 253 } 254 #define KEY_ALLOCSP_DEFAULT() \ 255 key_allocsp_default(__FILE__, __LINE__) 256 257 /* 258 * For OUTBOUND packet having a socket. Searching SPD for packet, 259 * and return a pointer to SP. 260 * OUT: NULL: no apropreate SP found, the following value is set to error. 261 * 0 : bypass 262 * EACCES : discard packet. 263 * ENOENT : ipsec_acquire() in progress, maybe. 264 * others : error occured. 265 * others: a pointer to SP 266 * 267 * NOTE: IPv6 mapped adddress concern is implemented here. 268 */ 269 struct secpolicy * 270 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 271 { 272 struct secpolicy *sp; 273 274 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 275 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 276 ("invalid direction %u", dir)); 277 278 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 279 if (sp == NULL) /*XXX????*/ 280 sp = KEY_ALLOCSP_DEFAULT(); 281 IPSEC_ASSERT(sp != NULL, ("null SP")); 282 return sp; 283 } 284 285 /* 286 * For OUTBOUND packet having a socket. Searching SPD for packet, 287 * and return a pointer to SP. 288 * OUT: NULL: no apropreate SP found, the following value is set to error. 289 * 0 : bypass 290 * EACCES : discard packet. 291 * ENOENT : ipsec_acquire() in progress, maybe. 292 * others : error occured. 293 * others: a pointer to SP 294 * 295 * NOTE: IPv6 mapped adddress concern is implemented here. 296 */ 297 struct secpolicy * 298 ipsec_getpolicybysock(m, dir, inp, error) 299 struct mbuf *m; 300 u_int dir; 301 struct inpcb *inp; 302 int *error; 303 { 304 struct inpcbpolicy *pcbsp = NULL; 305 struct secpolicy *currsp = NULL; /* policy on socket */ 306 struct secpolicy *sp; 307 308 IPSEC_ASSERT(m != NULL, ("null mbuf")); 309 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 310 IPSEC_ASSERT(error != NULL, ("null error")); 311 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 312 ("invalid direction %u", dir)); 313 314 /* set spidx in pcb */ 315 if (inp->inp_vflag & INP_IPV6PROTO) { 316 #ifdef INET6 317 *error = ipsec6_setspidx_in6pcb(m, inp); 318 pcbsp = inp->in6p_sp; 319 #else 320 *error = EINVAL; /* should not happen */ 321 #endif 322 } else { 323 *error = ipsec4_setspidx_inpcb(m, inp); 324 pcbsp = inp->inp_sp; 325 } 326 if (*error) 327 return NULL; 328 329 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 330 switch (dir) { 331 case IPSEC_DIR_INBOUND: 332 currsp = pcbsp->sp_in; 333 break; 334 case IPSEC_DIR_OUTBOUND: 335 currsp = pcbsp->sp_out; 336 break; 337 } 338 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 339 340 if (pcbsp->priv) { /* when privilieged socket */ 341 switch (currsp->policy) { 342 case IPSEC_POLICY_BYPASS: 343 case IPSEC_POLICY_IPSEC: 344 key_addref(currsp); 345 sp = currsp; 346 break; 347 348 case IPSEC_POLICY_ENTRUST: 349 /* look for a policy in SPD */ 350 sp = KEY_ALLOCSP(&currsp->spidx, dir); 351 if (sp == NULL) /* no SP found */ 352 sp = KEY_ALLOCSP_DEFAULT(); 353 break; 354 355 default: 356 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 357 __func__, currsp->policy)); 358 *error = EINVAL; 359 return NULL; 360 } 361 } else { /* unpriv, SPD has policy */ 362 sp = KEY_ALLOCSP(&currsp->spidx, dir); 363 if (sp == NULL) { /* no SP found */ 364 switch (currsp->policy) { 365 case IPSEC_POLICY_BYPASS: 366 ipseclog((LOG_ERR, "%s: Illegal policy for " 367 "non-priviliged defined %d\n", 368 __func__, currsp->policy)); 369 *error = EINVAL; 370 return NULL; 371 372 case IPSEC_POLICY_ENTRUST: 373 sp = KEY_ALLOCSP_DEFAULT(); 374 break; 375 376 case IPSEC_POLICY_IPSEC: 377 key_addref(currsp); 378 sp = currsp; 379 break; 380 381 default: 382 ipseclog((LOG_ERR, "%s: Invalid policy for " 383 "PCB %d\n", __func__, currsp->policy)); 384 *error = EINVAL; 385 return NULL; 386 } 387 } 388 } 389 IPSEC_ASSERT(sp != NULL, 390 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 391 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 392 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 393 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 394 return sp; 395 } 396 397 /* 398 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 399 * and return a pointer to SP. 400 * OUT: positive: a pointer to the entry for security policy leaf matched. 401 * NULL: no apropreate SP found, the following value is set to error. 402 * 0 : bypass 403 * EACCES : discard packet. 404 * ENOENT : ipsec_acquire() in progress, maybe. 405 * others : error occured. 406 */ 407 struct secpolicy * 408 ipsec_getpolicybyaddr(m, dir, flag, error) 409 struct mbuf *m; 410 u_int dir; 411 int flag; 412 int *error; 413 { 414 struct secpolicyindex spidx; 415 struct secpolicy *sp; 416 417 IPSEC_ASSERT(m != NULL, ("null mbuf")); 418 IPSEC_ASSERT(error != NULL, ("null error")); 419 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 420 ("invalid direction %u", dir)); 421 422 sp = NULL; 423 if (key_havesp(dir)) { 424 /* Make an index to look for a policy. */ 425 *error = ipsec_setspidx(m, &spidx, 426 (flag & IP_FORWARDING) ? 0 : 1); 427 if (*error != 0) { 428 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 429 __func__, dir, flag)); 430 return NULL; 431 } 432 spidx.dir = dir; 433 434 sp = KEY_ALLOCSP(&spidx, dir); 435 } 436 if (sp == NULL) /* no SP found, use system default */ 437 sp = KEY_ALLOCSP_DEFAULT(); 438 IPSEC_ASSERT(sp != NULL, ("null SP")); 439 return sp; 440 } 441 442 struct secpolicy * 443 ipsec4_checkpolicy(m, dir, flag, error, inp) 444 struct mbuf *m; 445 u_int dir, flag; 446 int *error; 447 struct inpcb *inp; 448 { 449 struct secpolicy *sp; 450 451 *error = 0; 452 if (inp == NULL) 453 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 454 else 455 sp = ipsec_getpolicybysock(m, dir, inp, error); 456 if (sp == NULL) { 457 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 458 ipsec4stat.ips_out_inval++; 459 return NULL; 460 } 461 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 462 switch (sp->policy) { 463 case IPSEC_POLICY_ENTRUST: 464 default: 465 printf("%s: invalid policy %u\n", __func__, sp->policy); 466 /* fall thru... */ 467 case IPSEC_POLICY_DISCARD: 468 ipsec4stat.ips_out_polvio++; 469 *error = -EINVAL; /* packet is discarded by caller */ 470 break; 471 case IPSEC_POLICY_BYPASS: 472 case IPSEC_POLICY_NONE: 473 KEY_FREESP(&sp); 474 sp = NULL; /* NB: force NULL result */ 475 break; 476 case IPSEC_POLICY_IPSEC: 477 if (sp->req == NULL) /* acquire an SA */ 478 *error = key_spdacquire(sp); 479 break; 480 } 481 if (*error != 0) { 482 KEY_FREESP(&sp); 483 sp = NULL; 484 } 485 return sp; 486 } 487 488 static int 489 ipsec4_setspidx_inpcb(m, pcb) 490 struct mbuf *m; 491 struct inpcb *pcb; 492 { 493 int error; 494 495 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 496 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 497 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 498 ("null sp_in || sp_out")); 499 500 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 501 if (error == 0) { 502 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 503 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 504 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 505 } else { 506 bzero(&pcb->inp_sp->sp_in->spidx, 507 sizeof (pcb->inp_sp->sp_in->spidx)); 508 bzero(&pcb->inp_sp->sp_out->spidx, 509 sizeof (pcb->inp_sp->sp_in->spidx)); 510 } 511 return error; 512 } 513 514 #ifdef INET6 515 static int 516 ipsec6_setspidx_in6pcb(m, pcb) 517 struct mbuf *m; 518 struct in6pcb *pcb; 519 { 520 struct secpolicyindex *spidx; 521 int error; 522 523 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 524 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 525 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 526 ("null sp_in || sp_out")); 527 528 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 529 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 530 531 spidx = &pcb->in6p_sp->sp_in->spidx; 532 error = ipsec_setspidx(m, spidx, 1); 533 if (error) 534 goto bad; 535 spidx->dir = IPSEC_DIR_INBOUND; 536 537 spidx = &pcb->in6p_sp->sp_out->spidx; 538 error = ipsec_setspidx(m, spidx, 1); 539 if (error) 540 goto bad; 541 spidx->dir = IPSEC_DIR_OUTBOUND; 542 543 return 0; 544 545 bad: 546 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 547 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 548 return error; 549 } 550 #endif 551 552 /* 553 * configure security policy index (src/dst/proto/sport/dport) 554 * by looking at the content of mbuf. 555 * the caller is responsible for error recovery (like clearing up spidx). 556 */ 557 static int 558 ipsec_setspidx(m, spidx, needport) 559 struct mbuf *m; 560 struct secpolicyindex *spidx; 561 int needport; 562 { 563 struct ip *ip = NULL; 564 struct ip ipbuf; 565 u_int v; 566 struct mbuf *n; 567 int len; 568 int error; 569 570 IPSEC_ASSERT(m != NULL, ("null mbuf")); 571 572 /* 573 * validate m->m_pkthdr.len. we see incorrect length if we 574 * mistakenly call this function with inconsistent mbuf chain 575 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 576 */ 577 len = 0; 578 for (n = m; n; n = n->m_next) 579 len += n->m_len; 580 if (m->m_pkthdr.len != len) { 581 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 582 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 583 __func__, len, m->m_pkthdr.len)); 584 return EINVAL; 585 } 586 587 if (m->m_pkthdr.len < sizeof(struct ip)) { 588 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 589 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 590 __func__, m->m_pkthdr.len)); 591 return EINVAL; 592 } 593 594 if (m->m_len >= sizeof(*ip)) 595 ip = mtod(m, struct ip *); 596 else { 597 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 598 ip = &ipbuf; 599 } 600 #ifdef _IP_VHL 601 v = _IP_VHL_V(ip->ip_vhl); 602 #else 603 v = ip->ip_v; 604 #endif 605 switch (v) { 606 case 4: 607 error = ipsec4_setspidx_ipaddr(m, spidx); 608 if (error) 609 return error; 610 ipsec4_get_ulp(m, spidx, needport); 611 return 0; 612 #ifdef INET6 613 case 6: 614 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 615 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 616 printf("%s: pkthdr len(%d) too small (v6), " 617 "ignored\n", __func__, m->m_pkthdr.len)); 618 return EINVAL; 619 } 620 error = ipsec6_setspidx_ipaddr(m, spidx); 621 if (error) 622 return error; 623 ipsec6_get_ulp(m, spidx, needport); 624 return 0; 625 #endif 626 default: 627 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 628 printf("%s: " "unknown IP version %u, ignored.\n", 629 __func__, v)); 630 return EINVAL; 631 } 632 } 633 634 static void 635 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 636 { 637 u_int8_t nxt; 638 int off; 639 640 /* sanity check */ 641 IPSEC_ASSERT(m != NULL, ("null mbuf")); 642 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 643 644 /* NB: ip_input() flips it into host endian XXX need more checking */ 645 if (m->m_len < sizeof (struct ip)) { 646 struct ip *ip = mtod(m, struct ip *); 647 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 648 goto done; 649 #ifdef _IP_VHL 650 off = _IP_VHL_HL(ip->ip_vhl) << 2; 651 #else 652 off = ip->ip_hl << 2; 653 #endif 654 nxt = ip->ip_p; 655 } else { 656 struct ip ih; 657 658 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 659 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 660 goto done; 661 #ifdef _IP_VHL 662 off = _IP_VHL_HL(ih.ip_vhl) << 2; 663 #else 664 off = ih.ip_hl << 2; 665 #endif 666 nxt = ih.ip_p; 667 } 668 669 while (off < m->m_pkthdr.len) { 670 struct ip6_ext ip6e; 671 struct tcphdr th; 672 struct udphdr uh; 673 674 switch (nxt) { 675 case IPPROTO_TCP: 676 spidx->ul_proto = nxt; 677 if (!needport) 678 goto done_proto; 679 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 680 goto done; 681 m_copydata(m, off, sizeof (th), (caddr_t) &th); 682 spidx->src.sin.sin_port = th.th_sport; 683 spidx->dst.sin.sin_port = th.th_dport; 684 return; 685 case IPPROTO_UDP: 686 spidx->ul_proto = nxt; 687 if (!needport) 688 goto done_proto; 689 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 690 goto done; 691 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 692 spidx->src.sin.sin_port = uh.uh_sport; 693 spidx->dst.sin.sin_port = uh.uh_dport; 694 return; 695 case IPPROTO_AH: 696 if (off + sizeof(ip6e) > m->m_pkthdr.len) 697 goto done; 698 /* XXX sigh, this works but is totally bogus */ 699 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 700 off += (ip6e.ip6e_len + 2) << 2; 701 nxt = ip6e.ip6e_nxt; 702 break; 703 case IPPROTO_ICMP: 704 default: 705 /* XXX intermediate headers??? */ 706 spidx->ul_proto = nxt; 707 goto done_proto; 708 } 709 } 710 done: 711 spidx->ul_proto = IPSEC_ULPROTO_ANY; 712 done_proto: 713 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 714 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 715 } 716 717 /* assumes that m is sane */ 718 static int 719 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 720 { 721 static const struct sockaddr_in template = { 722 sizeof (struct sockaddr_in), 723 AF_INET, 724 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 725 }; 726 727 spidx->src.sin = template; 728 spidx->dst.sin = template; 729 730 if (m->m_len < sizeof (struct ip)) { 731 m_copydata(m, offsetof(struct ip, ip_src), 732 sizeof (struct in_addr), 733 (caddr_t) &spidx->src.sin.sin_addr); 734 m_copydata(m, offsetof(struct ip, ip_dst), 735 sizeof (struct in_addr), 736 (caddr_t) &spidx->dst.sin.sin_addr); 737 } else { 738 struct ip *ip = mtod(m, struct ip *); 739 spidx->src.sin.sin_addr = ip->ip_src; 740 spidx->dst.sin.sin_addr = ip->ip_dst; 741 } 742 743 spidx->prefs = sizeof(struct in_addr) << 3; 744 spidx->prefd = sizeof(struct in_addr) << 3; 745 746 return 0; 747 } 748 749 #ifdef INET6 750 static void 751 ipsec6_get_ulp(m, spidx, needport) 752 struct mbuf *m; 753 struct secpolicyindex *spidx; 754 int needport; 755 { 756 int off, nxt; 757 struct tcphdr th; 758 struct udphdr uh; 759 struct icmp6_hdr ih; 760 761 /* sanity check */ 762 if (m == NULL) 763 panic("%s: NULL pointer was passed.\n", __func__); 764 765 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 766 printf("%s:\n", __func__); kdebug_mbuf(m)); 767 768 /* set default */ 769 spidx->ul_proto = IPSEC_ULPROTO_ANY; 770 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 771 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 772 773 nxt = -1; 774 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 775 if (off < 0 || m->m_pkthdr.len < off) 776 return; 777 778 switch (nxt) { 779 case IPPROTO_TCP: 780 spidx->ul_proto = nxt; 781 if (!needport) 782 break; 783 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 784 break; 785 m_copydata(m, off, sizeof(th), (caddr_t)&th); 786 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 787 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 788 break; 789 case IPPROTO_UDP: 790 spidx->ul_proto = nxt; 791 if (!needport) 792 break; 793 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 794 break; 795 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 796 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 797 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 798 break; 799 case IPPROTO_ICMPV6: 800 spidx->ul_proto = nxt; 801 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 802 break; 803 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 804 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 805 htons((uint16_t)ih.icmp6_type); 806 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 807 htons((uint16_t)ih.icmp6_code); 808 break; 809 default: 810 /* XXX intermediate headers??? */ 811 spidx->ul_proto = nxt; 812 break; 813 } 814 } 815 816 /* assumes that m is sane */ 817 static int 818 ipsec6_setspidx_ipaddr(m, spidx) 819 struct mbuf *m; 820 struct secpolicyindex *spidx; 821 { 822 struct ip6_hdr *ip6 = NULL; 823 struct ip6_hdr ip6buf; 824 struct sockaddr_in6 *sin6; 825 826 if (m->m_len >= sizeof(*ip6)) 827 ip6 = mtod(m, struct ip6_hdr *); 828 else { 829 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 830 ip6 = &ip6buf; 831 } 832 833 sin6 = (struct sockaddr_in6 *)&spidx->src; 834 bzero(sin6, sizeof(*sin6)); 835 sin6->sin6_family = AF_INET6; 836 sin6->sin6_len = sizeof(struct sockaddr_in6); 837 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 838 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 839 sin6->sin6_addr.s6_addr16[1] = 0; 840 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 841 } 842 spidx->prefs = sizeof(struct in6_addr) << 3; 843 844 sin6 = (struct sockaddr_in6 *)&spidx->dst; 845 bzero(sin6, sizeof(*sin6)); 846 sin6->sin6_family = AF_INET6; 847 sin6->sin6_len = sizeof(struct sockaddr_in6); 848 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 849 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 850 sin6->sin6_addr.s6_addr16[1] = 0; 851 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 852 } 853 spidx->prefd = sizeof(struct in6_addr) << 3; 854 855 return 0; 856 } 857 #endif 858 859 static void 860 ipsec_delpcbpolicy(p) 861 struct inpcbpolicy *p; 862 { 863 free(p, M_IPSEC_INPCB); 864 } 865 866 /* initialize policy in PCB */ 867 int 868 ipsec_init_policy(so, pcb_sp) 869 struct socket *so; 870 struct inpcbpolicy **pcb_sp; 871 { 872 struct inpcbpolicy *new; 873 874 /* sanity check. */ 875 if (so == NULL || pcb_sp == NULL) 876 panic("%s: NULL pointer was passed.\n", __func__); 877 878 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 879 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 880 if (new == NULL) { 881 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 882 return ENOBUFS; 883 } 884 885 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 886 887 if ((new->sp_in = KEY_NEWSP()) == NULL) { 888 ipsec_delpcbpolicy(new); 889 return ENOBUFS; 890 } 891 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 892 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 893 894 if ((new->sp_out = KEY_NEWSP()) == NULL) { 895 KEY_FREESP(&new->sp_in); 896 ipsec_delpcbpolicy(new); 897 return ENOBUFS; 898 } 899 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 900 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 901 902 *pcb_sp = new; 903 904 return 0; 905 } 906 907 /* copy old ipsec policy into new */ 908 int 909 ipsec_copy_policy(old, new) 910 struct inpcbpolicy *old, *new; 911 { 912 struct secpolicy *sp; 913 914 sp = ipsec_deepcopy_policy(old->sp_in); 915 if (sp) { 916 KEY_FREESP(&new->sp_in); 917 new->sp_in = sp; 918 } else 919 return ENOBUFS; 920 921 sp = ipsec_deepcopy_policy(old->sp_out); 922 if (sp) { 923 KEY_FREESP(&new->sp_out); 924 new->sp_out = sp; 925 } else 926 return ENOBUFS; 927 928 new->priv = old->priv; 929 930 return 0; 931 } 932 933 struct ipsecrequest * 934 ipsec_newisr(void) 935 { 936 struct ipsecrequest *p; 937 938 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 939 if (p != NULL) 940 IPSECREQUEST_LOCK_INIT(p); 941 return p; 942 } 943 944 void 945 ipsec_delisr(struct ipsecrequest *p) 946 { 947 IPSECREQUEST_LOCK_DESTROY(p); 948 free(p, M_IPSEC_SR); 949 } 950 951 /* deep-copy a policy in PCB */ 952 static struct secpolicy * 953 ipsec_deepcopy_policy(src) 954 struct secpolicy *src; 955 { 956 struct ipsecrequest *newchain = NULL; 957 struct ipsecrequest *p; 958 struct ipsecrequest **q; 959 struct ipsecrequest *r; 960 struct secpolicy *dst; 961 962 if (src == NULL) 963 return NULL; 964 dst = KEY_NEWSP(); 965 if (dst == NULL) 966 return NULL; 967 968 /* 969 * deep-copy IPsec request chain. This is required since struct 970 * ipsecrequest is not reference counted. 971 */ 972 q = &newchain; 973 for (p = src->req; p; p = p->next) { 974 *q = ipsec_newisr(); 975 if (*q == NULL) 976 goto fail; 977 (*q)->saidx.proto = p->saidx.proto; 978 (*q)->saidx.mode = p->saidx.mode; 979 (*q)->level = p->level; 980 (*q)->saidx.reqid = p->saidx.reqid; 981 982 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 983 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 984 985 (*q)->sp = dst; 986 987 q = &((*q)->next); 988 } 989 990 dst->req = newchain; 991 dst->state = src->state; 992 dst->policy = src->policy; 993 /* do not touch the refcnt fields */ 994 995 return dst; 996 997 fail: 998 for (p = newchain; p; p = r) { 999 r = p->next; 1000 ipsec_delisr(p); 1001 p = NULL; 1002 } 1003 return NULL; 1004 } 1005 1006 /* set policy and ipsec request if present. */ 1007 static int 1008 ipsec_set_policy(pcb_sp, optname, request, len, cred) 1009 struct secpolicy **pcb_sp; 1010 int optname; 1011 caddr_t request; 1012 size_t len; 1013 struct ucred *cred; 1014 { 1015 struct sadb_x_policy *xpl; 1016 struct secpolicy *newsp = NULL; 1017 int error; 1018 1019 /* sanity check. */ 1020 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1021 return EINVAL; 1022 if (len < sizeof(*xpl)) 1023 return EINVAL; 1024 xpl = (struct sadb_x_policy *)request; 1025 1026 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1027 printf("%s: passed policy\n", __func__); 1028 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1029 1030 /* check policy type */ 1031 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1032 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1033 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1034 return EINVAL; 1035 1036 /* check privileged socket */ 1037 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1038 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 1039 if (error) 1040 return EACCES; 1041 } 1042 1043 /* allocation new SP entry */ 1044 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1045 return error; 1046 1047 newsp->state = IPSEC_SPSTATE_ALIVE; 1048 1049 /* clear old SP and set new SP */ 1050 KEY_FREESP(pcb_sp); 1051 *pcb_sp = newsp; 1052 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1053 printf("%s: new policy\n", __func__); 1054 kdebug_secpolicy(newsp)); 1055 1056 return 0; 1057 } 1058 1059 static int 1060 ipsec_get_policy(pcb_sp, mp) 1061 struct secpolicy *pcb_sp; 1062 struct mbuf **mp; 1063 { 1064 1065 /* sanity check. */ 1066 if (pcb_sp == NULL || mp == NULL) 1067 return EINVAL; 1068 1069 *mp = key_sp2msg(pcb_sp); 1070 if (!*mp) { 1071 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1072 return ENOBUFS; 1073 } 1074 1075 (*mp)->m_type = MT_DATA; 1076 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1077 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1078 1079 return 0; 1080 } 1081 1082 int 1083 ipsec4_set_policy(inp, optname, request, len, cred) 1084 struct inpcb *inp; 1085 int optname; 1086 caddr_t request; 1087 size_t len; 1088 struct ucred *cred; 1089 { 1090 struct sadb_x_policy *xpl; 1091 struct secpolicy **pcb_sp; 1092 1093 /* sanity check. */ 1094 if (inp == NULL || request == NULL) 1095 return EINVAL; 1096 if (len < sizeof(*xpl)) 1097 return EINVAL; 1098 xpl = (struct sadb_x_policy *)request; 1099 1100 /* select direction */ 1101 switch (xpl->sadb_x_policy_dir) { 1102 case IPSEC_DIR_INBOUND: 1103 pcb_sp = &inp->inp_sp->sp_in; 1104 break; 1105 case IPSEC_DIR_OUTBOUND: 1106 pcb_sp = &inp->inp_sp->sp_out; 1107 break; 1108 default: 1109 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1110 xpl->sadb_x_policy_dir)); 1111 return EINVAL; 1112 } 1113 1114 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1115 } 1116 1117 int 1118 ipsec4_get_policy(inp, request, len, mp) 1119 struct inpcb *inp; 1120 caddr_t request; 1121 size_t len; 1122 struct mbuf **mp; 1123 { 1124 struct sadb_x_policy *xpl; 1125 struct secpolicy *pcb_sp; 1126 1127 /* sanity check. */ 1128 if (inp == NULL || request == NULL || mp == NULL) 1129 return EINVAL; 1130 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1131 if (len < sizeof(*xpl)) 1132 return EINVAL; 1133 xpl = (struct sadb_x_policy *)request; 1134 1135 /* select direction */ 1136 switch (xpl->sadb_x_policy_dir) { 1137 case IPSEC_DIR_INBOUND: 1138 pcb_sp = inp->inp_sp->sp_in; 1139 break; 1140 case IPSEC_DIR_OUTBOUND: 1141 pcb_sp = inp->inp_sp->sp_out; 1142 break; 1143 default: 1144 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1145 xpl->sadb_x_policy_dir)); 1146 return EINVAL; 1147 } 1148 1149 return ipsec_get_policy(pcb_sp, mp); 1150 } 1151 1152 /* delete policy in PCB */ 1153 int 1154 ipsec4_delete_pcbpolicy(inp) 1155 struct inpcb *inp; 1156 { 1157 IPSEC_ASSERT(inp != NULL, ("null inp")); 1158 1159 if (inp->inp_sp == NULL) 1160 return 0; 1161 1162 if (inp->inp_sp->sp_in != NULL) 1163 KEY_FREESP(&inp->inp_sp->sp_in); 1164 1165 if (inp->inp_sp->sp_out != NULL) 1166 KEY_FREESP(&inp->inp_sp->sp_out); 1167 1168 ipsec_delpcbpolicy(inp->inp_sp); 1169 inp->inp_sp = NULL; 1170 1171 return 0; 1172 } 1173 1174 #ifdef INET6 1175 int 1176 ipsec6_set_policy(in6p, optname, request, len, cred) 1177 struct in6pcb *in6p; 1178 int optname; 1179 caddr_t request; 1180 size_t len; 1181 struct ucred *cred; 1182 { 1183 struct sadb_x_policy *xpl; 1184 struct secpolicy **pcb_sp; 1185 1186 /* sanity check. */ 1187 if (in6p == NULL || request == NULL) 1188 return EINVAL; 1189 if (len < sizeof(*xpl)) 1190 return EINVAL; 1191 xpl = (struct sadb_x_policy *)request; 1192 1193 /* select direction */ 1194 switch (xpl->sadb_x_policy_dir) { 1195 case IPSEC_DIR_INBOUND: 1196 pcb_sp = &in6p->in6p_sp->sp_in; 1197 break; 1198 case IPSEC_DIR_OUTBOUND: 1199 pcb_sp = &in6p->in6p_sp->sp_out; 1200 break; 1201 default: 1202 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1203 xpl->sadb_x_policy_dir)); 1204 return EINVAL; 1205 } 1206 1207 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1208 } 1209 1210 int 1211 ipsec6_get_policy(in6p, request, len, mp) 1212 struct in6pcb *in6p; 1213 caddr_t request; 1214 size_t len; 1215 struct mbuf **mp; 1216 { 1217 struct sadb_x_policy *xpl; 1218 struct secpolicy *pcb_sp; 1219 1220 /* sanity check. */ 1221 if (in6p == NULL || request == NULL || mp == NULL) 1222 return EINVAL; 1223 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1224 if (len < sizeof(*xpl)) 1225 return EINVAL; 1226 xpl = (struct sadb_x_policy *)request; 1227 1228 /* select direction */ 1229 switch (xpl->sadb_x_policy_dir) { 1230 case IPSEC_DIR_INBOUND: 1231 pcb_sp = in6p->in6p_sp->sp_in; 1232 break; 1233 case IPSEC_DIR_OUTBOUND: 1234 pcb_sp = in6p->in6p_sp->sp_out; 1235 break; 1236 default: 1237 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1238 xpl->sadb_x_policy_dir)); 1239 return EINVAL; 1240 } 1241 1242 return ipsec_get_policy(pcb_sp, mp); 1243 } 1244 1245 int 1246 ipsec6_delete_pcbpolicy(in6p) 1247 struct in6pcb *in6p; 1248 { 1249 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1250 1251 if (in6p->in6p_sp == NULL) 1252 return 0; 1253 1254 if (in6p->in6p_sp->sp_in != NULL) 1255 KEY_FREESP(&in6p->in6p_sp->sp_in); 1256 1257 if (in6p->in6p_sp->sp_out != NULL) 1258 KEY_FREESP(&in6p->in6p_sp->sp_out); 1259 1260 ipsec_delpcbpolicy(in6p->in6p_sp); 1261 in6p->in6p_sp = NULL; 1262 1263 return 0; 1264 } 1265 #endif 1266 1267 /* 1268 * return current level. 1269 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1270 */ 1271 u_int 1272 ipsec_get_reqlevel(isr) 1273 struct ipsecrequest *isr; 1274 { 1275 u_int level = 0; 1276 u_int esp_trans_deflev, esp_net_deflev; 1277 u_int ah_trans_deflev, ah_net_deflev; 1278 1279 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1280 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1281 ("af family mismatch, src %u, dst %u", 1282 isr->sp->spidx.src.sa.sa_family, 1283 isr->sp->spidx.dst.sa.sa_family)); 1284 1285 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1286 #define IPSEC_CHECK_DEFAULT(lev) \ 1287 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1288 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1289 ? (ipsec_debug \ 1290 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1291 (lev), IPSEC_LEVEL_REQUIRE) \ 1292 : 0), \ 1293 (lev) = IPSEC_LEVEL_REQUIRE, \ 1294 (lev) \ 1295 : (lev)) 1296 1297 /* set default level */ 1298 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1299 #ifdef INET 1300 case AF_INET: 1301 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1302 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1303 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1304 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1305 break; 1306 #endif 1307 #ifdef INET6 1308 case AF_INET6: 1309 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1310 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1311 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1312 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1313 break; 1314 #endif /* INET6 */ 1315 default: 1316 panic("%s: unknown af %u", 1317 __func__, isr->sp->spidx.src.sa.sa_family); 1318 } 1319 1320 #undef IPSEC_CHECK_DEFAULT 1321 1322 /* set level */ 1323 switch (isr->level) { 1324 case IPSEC_LEVEL_DEFAULT: 1325 switch (isr->saidx.proto) { 1326 case IPPROTO_ESP: 1327 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1328 level = esp_net_deflev; 1329 else 1330 level = esp_trans_deflev; 1331 break; 1332 case IPPROTO_AH: 1333 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1334 level = ah_net_deflev; 1335 else 1336 level = ah_trans_deflev; 1337 break; 1338 case IPPROTO_IPCOMP: 1339 /* 1340 * we don't really care, as IPcomp document says that 1341 * we shouldn't compress small packets 1342 */ 1343 level = IPSEC_LEVEL_USE; 1344 break; 1345 default: 1346 panic("%s: Illegal protocol defined %u\n", __func__, 1347 isr->saidx.proto); 1348 } 1349 break; 1350 1351 case IPSEC_LEVEL_USE: 1352 case IPSEC_LEVEL_REQUIRE: 1353 level = isr->level; 1354 break; 1355 case IPSEC_LEVEL_UNIQUE: 1356 level = IPSEC_LEVEL_REQUIRE; 1357 break; 1358 1359 default: 1360 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1361 } 1362 1363 return level; 1364 } 1365 1366 /* 1367 * Check security policy requirements against the actual 1368 * packet contents. Return one if the packet should be 1369 * reject as "invalid"; otherwiser return zero to have the 1370 * packet treated as "valid". 1371 * 1372 * OUT: 1373 * 0: valid 1374 * 1: invalid 1375 */ 1376 int 1377 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1378 { 1379 struct ipsecrequest *isr; 1380 int need_auth; 1381 1382 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1383 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1384 1385 /* check policy */ 1386 switch (sp->policy) { 1387 case IPSEC_POLICY_DISCARD: 1388 return 1; 1389 case IPSEC_POLICY_BYPASS: 1390 case IPSEC_POLICY_NONE: 1391 return 0; 1392 } 1393 1394 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1395 ("invalid policy %u", sp->policy)); 1396 1397 /* XXX should compare policy against ipsec header history */ 1398 1399 need_auth = 0; 1400 for (isr = sp->req; isr != NULL; isr = isr->next) { 1401 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1402 continue; 1403 switch (isr->saidx.proto) { 1404 case IPPROTO_ESP: 1405 if ((m->m_flags & M_DECRYPTED) == 0) { 1406 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1407 printf("%s: ESP m_flags:%x\n", __func__, 1408 m->m_flags)); 1409 return 1; 1410 } 1411 1412 if (!need_auth && 1413 isr->sav != NULL && 1414 isr->sav->tdb_authalgxform != NULL && 1415 (m->m_flags & M_AUTHIPDGM) == 0) { 1416 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1417 printf("%s: ESP/AH m_flags:%x\n", __func__, 1418 m->m_flags)); 1419 return 1; 1420 } 1421 break; 1422 case IPPROTO_AH: 1423 need_auth = 1; 1424 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1425 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1426 printf("%s: AH m_flags:%x\n", __func__, 1427 m->m_flags)); 1428 return 1; 1429 } 1430 break; 1431 case IPPROTO_IPCOMP: 1432 /* 1433 * we don't really care, as IPcomp document 1434 * says that we shouldn't compress small 1435 * packets, IPComp policy should always be 1436 * treated as being in "use" level. 1437 */ 1438 break; 1439 } 1440 } 1441 return 0; /* valid */ 1442 } 1443 1444 /* 1445 * Check AH/ESP integrity. 1446 * This function is called from tcp_input(), udp_input(), 1447 * and {ah,esp}4_input for tunnel mode 1448 */ 1449 int 1450 ipsec4_in_reject(m, inp) 1451 struct mbuf *m; 1452 struct inpcb *inp; 1453 { 1454 struct secpolicy *sp; 1455 int error; 1456 int result; 1457 1458 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1459 1460 /* get SP for this packet. 1461 * When we are called from ip_forward(), we call 1462 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1463 */ 1464 if (inp == NULL) 1465 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1466 else 1467 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1468 1469 if (sp != NULL) { 1470 result = ipsec_in_reject(sp, m); 1471 if (result) 1472 ipsec4stat.ips_in_polvio++; 1473 KEY_FREESP(&sp); 1474 } else { 1475 result = 0; /* XXX should be panic ? 1476 * -> No, there may be error. */ 1477 } 1478 return result; 1479 } 1480 1481 #ifdef INET6 1482 /* 1483 * Check AH/ESP integrity. 1484 * This function is called from tcp6_input(), udp6_input(), 1485 * and {ah,esp}6_input for tunnel mode 1486 */ 1487 int 1488 ipsec6_in_reject(m, inp) 1489 struct mbuf *m; 1490 struct inpcb *inp; 1491 { 1492 struct secpolicy *sp = NULL; 1493 int error; 1494 int result; 1495 1496 /* sanity check */ 1497 if (m == NULL) 1498 return 0; /* XXX should be panic ? */ 1499 1500 /* get SP for this packet. 1501 * When we are called from ip_forward(), we call 1502 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1503 */ 1504 if (inp == NULL) 1505 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1506 else 1507 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1508 1509 if (sp != NULL) { 1510 result = ipsec_in_reject(sp, m); 1511 if (result) 1512 ipsec6stat.ips_in_polvio++; 1513 KEY_FREESP(&sp); 1514 } else { 1515 result = 0; 1516 } 1517 return result; 1518 } 1519 #endif 1520 1521 /* 1522 * compute the byte size to be occupied by IPsec header. 1523 * in case it is tunneled, it includes the size of outer IP header. 1524 * NOTE: SP passed is free in this function. 1525 */ 1526 static size_t 1527 ipsec_hdrsiz(struct secpolicy *sp) 1528 { 1529 struct ipsecrequest *isr; 1530 size_t siz; 1531 1532 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1533 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1534 1535 switch (sp->policy) { 1536 case IPSEC_POLICY_DISCARD: 1537 case IPSEC_POLICY_BYPASS: 1538 case IPSEC_POLICY_NONE: 1539 return 0; 1540 } 1541 1542 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1543 ("invalid policy %u", sp->policy)); 1544 1545 siz = 0; 1546 for (isr = sp->req; isr != NULL; isr = isr->next) { 1547 size_t clen = 0; 1548 1549 switch (isr->saidx.proto) { 1550 case IPPROTO_ESP: 1551 clen = esp_hdrsiz(isr->sav); 1552 break; 1553 case IPPROTO_AH: 1554 clen = ah_hdrsiz(isr->sav); 1555 break; 1556 case IPPROTO_IPCOMP: 1557 clen = sizeof(struct ipcomp); 1558 break; 1559 } 1560 1561 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1562 switch (isr->saidx.dst.sa.sa_family) { 1563 case AF_INET: 1564 clen += sizeof(struct ip); 1565 break; 1566 #ifdef INET6 1567 case AF_INET6: 1568 clen += sizeof(struct ip6_hdr); 1569 break; 1570 #endif 1571 default: 1572 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1573 "IPsec tunnel SA\n", __func__, 1574 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1575 break; 1576 } 1577 } 1578 siz += clen; 1579 } 1580 1581 return siz; 1582 } 1583 1584 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1585 size_t 1586 ipsec4_hdrsiz(m, dir, inp) 1587 struct mbuf *m; 1588 u_int dir; 1589 struct inpcb *inp; 1590 { 1591 struct secpolicy *sp; 1592 int error; 1593 size_t size; 1594 1595 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1596 1597 /* get SP for this packet. 1598 * When we are called from ip_forward(), we call 1599 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1600 */ 1601 if (inp == NULL) 1602 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1603 else 1604 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1605 1606 if (sp != NULL) { 1607 size = ipsec_hdrsiz(sp); 1608 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1609 printf("%s: size:%lu.\n", __func__, 1610 (unsigned long)size)); 1611 1612 KEY_FREESP(&sp); 1613 } else { 1614 size = 0; /* XXX should be panic ? */ 1615 } 1616 return size; 1617 } 1618 1619 #ifdef INET6 1620 /* This function is called from ipsec6_hdrsize_tcp(), 1621 * and maybe from ip6_forward.() 1622 */ 1623 size_t 1624 ipsec6_hdrsiz(m, dir, in6p) 1625 struct mbuf *m; 1626 u_int dir; 1627 struct in6pcb *in6p; 1628 { 1629 struct secpolicy *sp; 1630 int error; 1631 size_t size; 1632 1633 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1634 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1635 ("socket w/o inpcb")); 1636 1637 /* get SP for this packet */ 1638 /* XXX Is it right to call with IP_FORWARDING. */ 1639 if (in6p == NULL) 1640 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1641 else 1642 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1643 1644 if (sp == NULL) 1645 return 0; 1646 size = ipsec_hdrsiz(sp); 1647 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1648 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1649 KEY_FREESP(&sp); 1650 1651 return size; 1652 } 1653 #endif /*INET6*/ 1654 1655 /* 1656 * Check the variable replay window. 1657 * ipsec_chkreplay() performs replay check before ICV verification. 1658 * ipsec_updatereplay() updates replay bitmap. This must be called after 1659 * ICV verification (it also performs replay check, which is usually done 1660 * beforehand). 1661 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1662 * 1663 * based on RFC 2401. 1664 */ 1665 int 1666 ipsec_chkreplay(seq, sav) 1667 u_int32_t seq; 1668 struct secasvar *sav; 1669 { 1670 const struct secreplay *replay; 1671 u_int32_t diff; 1672 int fr; 1673 u_int32_t wsizeb; /* constant: bits of window size */ 1674 int frlast; /* constant: last frame */ 1675 1676 IPSEC_SPLASSERT_SOFTNET(__func__); 1677 1678 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1679 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1680 1681 replay = sav->replay; 1682 1683 if (replay->wsize == 0) 1684 return 1; /* no need to check replay. */ 1685 1686 /* constant */ 1687 frlast = replay->wsize - 1; 1688 wsizeb = replay->wsize << 3; 1689 1690 /* sequence number of 0 is invalid */ 1691 if (seq == 0) 1692 return 0; 1693 1694 /* first time is always okay */ 1695 if (replay->count == 0) 1696 return 1; 1697 1698 if (seq > replay->lastseq) { 1699 /* larger sequences are okay */ 1700 return 1; 1701 } else { 1702 /* seq is equal or less than lastseq. */ 1703 diff = replay->lastseq - seq; 1704 1705 /* over range to check, i.e. too old or wrapped */ 1706 if (diff >= wsizeb) 1707 return 0; 1708 1709 fr = frlast - diff / 8; 1710 1711 /* this packet already seen ? */ 1712 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1713 return 0; 1714 1715 /* out of order but good */ 1716 return 1; 1717 } 1718 } 1719 1720 /* 1721 * check replay counter whether to update or not. 1722 * OUT: 0: OK 1723 * 1: NG 1724 */ 1725 int 1726 ipsec_updatereplay(seq, sav) 1727 u_int32_t seq; 1728 struct secasvar *sav; 1729 { 1730 struct secreplay *replay; 1731 u_int32_t diff; 1732 int fr; 1733 u_int32_t wsizeb; /* constant: bits of window size */ 1734 int frlast; /* constant: last frame */ 1735 1736 IPSEC_SPLASSERT_SOFTNET(__func__); 1737 1738 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1739 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1740 1741 replay = sav->replay; 1742 1743 if (replay->wsize == 0) 1744 goto ok; /* no need to check replay. */ 1745 1746 /* constant */ 1747 frlast = replay->wsize - 1; 1748 wsizeb = replay->wsize << 3; 1749 1750 /* sequence number of 0 is invalid */ 1751 if (seq == 0) 1752 return 1; 1753 1754 /* first time */ 1755 if (replay->count == 0) { 1756 replay->lastseq = seq; 1757 bzero(replay->bitmap, replay->wsize); 1758 (replay->bitmap)[frlast] = 1; 1759 goto ok; 1760 } 1761 1762 if (seq > replay->lastseq) { 1763 /* seq is larger than lastseq. */ 1764 diff = seq - replay->lastseq; 1765 1766 /* new larger sequence number */ 1767 if (diff < wsizeb) { 1768 /* In window */ 1769 /* set bit for this packet */ 1770 vshiftl(replay->bitmap, diff, replay->wsize); 1771 (replay->bitmap)[frlast] |= 1; 1772 } else { 1773 /* this packet has a "way larger" */ 1774 bzero(replay->bitmap, replay->wsize); 1775 (replay->bitmap)[frlast] = 1; 1776 } 1777 replay->lastseq = seq; 1778 1779 /* larger is good */ 1780 } else { 1781 /* seq is equal or less than lastseq. */ 1782 diff = replay->lastseq - seq; 1783 1784 /* over range to check, i.e. too old or wrapped */ 1785 if (diff >= wsizeb) 1786 return 1; 1787 1788 fr = frlast - diff / 8; 1789 1790 /* this packet already seen ? */ 1791 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1792 return 1; 1793 1794 /* mark as seen */ 1795 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1796 1797 /* out of order but good */ 1798 } 1799 1800 ok: 1801 if (replay->count == ~0) { 1802 1803 /* set overflow flag */ 1804 replay->overflow++; 1805 1806 /* don't increment, no more packets accepted */ 1807 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1808 return 1; 1809 1810 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1811 __func__, replay->overflow, ipsec_logsastr(sav))); 1812 } 1813 1814 replay->count++; 1815 1816 return 0; 1817 } 1818 1819 /* 1820 * shift variable length buffer to left. 1821 * IN: bitmap: pointer to the buffer 1822 * nbit: the number of to shift. 1823 * wsize: buffer size (bytes). 1824 */ 1825 static void 1826 vshiftl(bitmap, nbit, wsize) 1827 unsigned char *bitmap; 1828 int nbit, wsize; 1829 { 1830 int s, j, i; 1831 unsigned char over; 1832 1833 for (j = 0; j < nbit; j += 8) { 1834 s = (nbit - j < 8) ? (nbit - j): 8; 1835 bitmap[0] <<= s; 1836 for (i = 1; i < wsize; i++) { 1837 over = (bitmap[i] >> (8 - s)); 1838 bitmap[i] <<= s; 1839 bitmap[i-1] |= over; 1840 } 1841 } 1842 1843 return; 1844 } 1845 1846 /* Return a printable string for the IPv4 address. */ 1847 static char * 1848 inet_ntoa4(struct in_addr ina) 1849 { 1850 static char buf[4][4 * sizeof "123" + 4]; 1851 unsigned char *ucp = (unsigned char *) &ina; 1852 static int i = 3; 1853 1854 /* XXX-BZ returns static buffer. */ 1855 i = (i + 1) % 4; 1856 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1857 ucp[2] & 0xff, ucp[3] & 0xff); 1858 return (buf[i]); 1859 } 1860 1861 /* Return a printable string for the address. */ 1862 char * 1863 ipsec_address(union sockaddr_union* sa) 1864 { 1865 #ifdef INET6 1866 char ip6buf[INET6_ADDRSTRLEN]; 1867 #endif 1868 switch (sa->sa.sa_family) { 1869 #ifdef INET 1870 case AF_INET: 1871 return inet_ntoa4(sa->sin.sin_addr); 1872 #endif /* INET */ 1873 1874 #ifdef INET6 1875 case AF_INET6: 1876 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1877 #endif /* INET6 */ 1878 1879 default: 1880 return "(unknown address family)"; 1881 } 1882 } 1883 1884 const char * 1885 ipsec_logsastr(sav) 1886 struct secasvar *sav; 1887 { 1888 static char buf[256]; 1889 char *p; 1890 struct secasindex *saidx = &sav->sah->saidx; 1891 1892 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1893 ("address family mismatch")); 1894 1895 p = buf; 1896 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1897 while (p && *p) 1898 p++; 1899 /* NB: only use ipsec_address on one address at a time */ 1900 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1901 ipsec_address(&saidx->src)); 1902 while (p && *p) 1903 p++; 1904 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1905 ipsec_address(&saidx->dst)); 1906 1907 return buf; 1908 } 1909 1910 void 1911 ipsec_dumpmbuf(m) 1912 struct mbuf *m; 1913 { 1914 int totlen; 1915 int i; 1916 u_char *p; 1917 1918 totlen = 0; 1919 printf("---\n"); 1920 while (m) { 1921 p = mtod(m, u_char *); 1922 for (i = 0; i < m->m_len; i++) { 1923 printf("%02x ", p[i]); 1924 totlen++; 1925 if (totlen % 16 == 0) 1926 printf("\n"); 1927 } 1928 m = m->m_next; 1929 } 1930 if (totlen % 16 != 0) 1931 printf("\n"); 1932 printf("---\n"); 1933 } 1934 1935 static void 1936 ipsec_attach(void) 1937 { 1938 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1939 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1940 } 1941 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL); 1942 1943 1944 /* XXX this stuff doesn't belong here... */ 1945 1946 static struct xformsw* xforms = NULL; 1947 1948 /* 1949 * Register a transform; typically at system startup. 1950 */ 1951 void 1952 xform_register(struct xformsw* xsp) 1953 { 1954 xsp->xf_next = xforms; 1955 xforms = xsp; 1956 } 1957 1958 /* 1959 * Initialize transform support in an sav. 1960 */ 1961 int 1962 xform_init(struct secasvar *sav, int xftype) 1963 { 1964 struct xformsw *xsp; 1965 1966 if (sav->tdb_xform != NULL) /* previously initialized */ 1967 return 0; 1968 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1969 if (xsp->xf_type == xftype) 1970 return (*xsp->xf_init)(sav, xsp); 1971 return EINVAL; 1972 }
Cache object: ff0d78d939a706f95e012ddaa09d4533
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