ipsec.c revision 167820
1/* $FreeBSD: head/sys/netipsec/ipsec.c 167820 2007-03-22 22:25:25Z sam $ */ 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 99int ipsec_debug = 1; 100#else 101int ipsec_debug = 0; 102#endif 103 104/* NB: name changed so netstat doesn't use it */ 105struct newipsecstat newipsecstat; 106int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 107int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 108int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 109int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 110int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 111int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 112struct secpolicy ip4_def_policy; 113int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 114int 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 */ 122int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 123 124SYSCTL_DECL(_net_inet_ipsec); 125 126/* net.inet.ipsec */ 127SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 128 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 129SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 130 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 131SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 132 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 133SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 134 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 135SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 136 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 137SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 138 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 139SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 140 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 141SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 142 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 143SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 144 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 145SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 146 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 147SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 148 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 149SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 150 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 151SYSCTL_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 */ 159int ipsec_replay = 0; 160SYSCTL_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 */ 166int ipsec_integrity = 0; 167SYSCTL_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 172int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 173int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 174int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 175int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 176int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 177int ip6_esp_randpad = -1; 178 179SYSCTL_DECL(_net_inet6_ipsec6); 180 181/* net.inet6.ipsec6 */ 182#ifdef COMPAT_KAME 183SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 184 0,0, compat_ipsecstats_sysctl, "S", ""); 185#endif /* COMPAT_KAME */ 186SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 187 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 188SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 189 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 190SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 191 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 192SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 193 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 194SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 195 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 196SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 197 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 198SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 199 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 200SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 201 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 202#endif /* INET6 */ 203 204static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 205#ifdef INET6 206static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 207#endif 208static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 209static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 210static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 211#ifdef INET6 212static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 213static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 214#endif 215static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 216static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 217static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 218 int optname, caddr_t request, size_t len, int priv)); 219static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 220static void vshiftl __P((unsigned char *, int, int)); 221static size_t ipsec_hdrsiz __P((struct secpolicy *)); 222 223MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 224 225/* 226 * Return a held reference to the default SP. 227 */ 228static struct secpolicy * 229key_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 */ 265struct secpolicy * 266ipsec_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 */ 293struct secpolicy * 294ipsec_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 */ 403struct secpolicy * 404ipsec_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 438struct secpolicy * 439ipsec4_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 484static int 485ipsec4_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 511static int 512ipsec6_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 541bad: 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 */ 553static int 554ipsec_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 630static void 631ipsec4_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 } 706done: 707 spidx->ul_proto = IPSEC_ULPROTO_ANY; 708done_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 */ 714static int 715ipsec4_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 746static void 747ipsec6_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; 755 756 /* sanity check */ 757 if (m == NULL) 758 panic("%s: NULL pointer was passed.\n", __func__); 759 760 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 761 printf("%s:\n", __func__); kdebug_mbuf(m)); 762 763 /* set default */ 764 spidx->ul_proto = IPSEC_ULPROTO_ANY; 765 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 766 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 767 768 nxt = -1; 769 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 770 if (off < 0 || m->m_pkthdr.len < off) 771 return; 772 773 switch (nxt) { 774 case IPPROTO_TCP: 775 spidx->ul_proto = nxt; 776 if (!needport) 777 break; 778 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 779 break; 780 m_copydata(m, off, sizeof(th), (caddr_t)&th); 781 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 782 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 783 break; 784 case IPPROTO_UDP: 785 spidx->ul_proto = nxt; 786 if (!needport) 787 break; 788 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 789 break; 790 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 791 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 792 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 793 break; 794 case IPPROTO_ICMPV6: 795 default: 796 /* XXX intermediate headers??? */ 797 spidx->ul_proto = nxt; 798 break; 799 } 800} 801 802/* assumes that m is sane */ 803static int 804ipsec6_setspidx_ipaddr(m, spidx) 805 struct mbuf *m; 806 struct secpolicyindex *spidx; 807{ 808 struct ip6_hdr *ip6 = NULL; 809 struct ip6_hdr ip6buf; 810 struct sockaddr_in6 *sin6; 811 812 if (m->m_len >= sizeof(*ip6)) 813 ip6 = mtod(m, struct ip6_hdr *); 814 else { 815 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 816 ip6 = &ip6buf; 817 } 818 819 sin6 = (struct sockaddr_in6 *)&spidx->src; 820 bzero(sin6, sizeof(*sin6)); 821 sin6->sin6_family = AF_INET6; 822 sin6->sin6_len = sizeof(struct sockaddr_in6); 823 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 824 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 825 sin6->sin6_addr.s6_addr16[1] = 0; 826 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 827 } 828 spidx->prefs = sizeof(struct in6_addr) << 3; 829 830 sin6 = (struct sockaddr_in6 *)&spidx->dst; 831 bzero(sin6, sizeof(*sin6)); 832 sin6->sin6_family = AF_INET6; 833 sin6->sin6_len = sizeof(struct sockaddr_in6); 834 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 835 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 836 sin6->sin6_addr.s6_addr16[1] = 0; 837 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 838 } 839 spidx->prefd = sizeof(struct in6_addr) << 3; 840 841 return 0; 842} 843#endif 844 845static void 846ipsec_delpcbpolicy(p) 847 struct inpcbpolicy *p; 848{ 849 free(p, M_IPSEC_INPCB); 850} 851 852/* initialize policy in PCB */ 853int 854ipsec_init_policy(so, pcb_sp) 855 struct socket *so; 856 struct inpcbpolicy **pcb_sp; 857{ 858 struct inpcbpolicy *new; 859 860 /* sanity check. */ 861 if (so == NULL || pcb_sp == NULL) 862 panic("%s: NULL pointer was passed.\n", __func__); 863 864 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 865 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 866 if (new == NULL) { 867 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 868 return ENOBUFS; 869 } 870 871 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 872 873 if ((new->sp_in = KEY_NEWSP()) == NULL) { 874 ipsec_delpcbpolicy(new); 875 return ENOBUFS; 876 } 877 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 878 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 879 880 if ((new->sp_out = KEY_NEWSP()) == NULL) { 881 KEY_FREESP(&new->sp_in); 882 ipsec_delpcbpolicy(new); 883 return ENOBUFS; 884 } 885 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 886 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 887 888 *pcb_sp = new; 889 890 return 0; 891} 892 893/* copy old ipsec policy into new */ 894int 895ipsec_copy_policy(old, new) 896 struct inpcbpolicy *old, *new; 897{ 898 struct secpolicy *sp; 899 900 sp = ipsec_deepcopy_policy(old->sp_in); 901 if (sp) { 902 KEY_FREESP(&new->sp_in); 903 new->sp_in = sp; 904 } else 905 return ENOBUFS; 906 907 sp = ipsec_deepcopy_policy(old->sp_out); 908 if (sp) { 909 KEY_FREESP(&new->sp_out); 910 new->sp_out = sp; 911 } else 912 return ENOBUFS; 913 914 new->priv = old->priv; 915 916 return 0; 917} 918 919struct ipsecrequest * 920ipsec_newisr(void) 921{ 922 struct ipsecrequest *p; 923 924 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 925 if (p != NULL) 926 IPSECREQUEST_LOCK_INIT(p); 927 return p; 928} 929 930void 931ipsec_delisr(struct ipsecrequest *p) 932{ 933 IPSECREQUEST_LOCK_DESTROY(p); 934 free(p, M_IPSEC_SR); 935} 936 937/* deep-copy a policy in PCB */ 938static struct secpolicy * 939ipsec_deepcopy_policy(src) 940 struct secpolicy *src; 941{ 942 struct ipsecrequest *newchain = NULL; 943 struct ipsecrequest *p; 944 struct ipsecrequest **q; 945 struct ipsecrequest *r; 946 struct secpolicy *dst; 947 948 if (src == NULL) 949 return NULL; 950 dst = KEY_NEWSP(); 951 if (dst == NULL) 952 return NULL; 953 954 /* 955 * deep-copy IPsec request chain. This is required since struct 956 * ipsecrequest is not reference counted. 957 */ 958 q = &newchain; 959 for (p = src->req; p; p = p->next) { 960 *q = ipsec_newisr(); 961 if (*q == NULL) 962 goto fail; 963 (*q)->saidx.proto = p->saidx.proto; 964 (*q)->saidx.mode = p->saidx.mode; 965 (*q)->level = p->level; 966 (*q)->saidx.reqid = p->saidx.reqid; 967 968 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 969 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 970 971 (*q)->sp = dst; 972 973 q = &((*q)->next); 974 } 975 976 dst->req = newchain; 977 dst->state = src->state; 978 dst->policy = src->policy; 979 /* do not touch the refcnt fields */ 980 981 return dst; 982 983fail: 984 for (p = newchain; p; p = r) { 985 r = p->next; 986 ipsec_delisr(p); 987 p = NULL; 988 } 989 return NULL; 990} 991 992/* set policy and ipsec request if present. */ 993static int 994ipsec_set_policy(pcb_sp, optname, request, len, priv) 995 struct secpolicy **pcb_sp; 996 int optname; 997 caddr_t request; 998 size_t len; 999 int priv; 1000{ 1001 struct sadb_x_policy *xpl; 1002 struct secpolicy *newsp = NULL; 1003 int error; 1004 1005 /* sanity check. */ 1006 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1007 return EINVAL; 1008 if (len < sizeof(*xpl)) 1009 return EINVAL; 1010 xpl = (struct sadb_x_policy *)request; 1011 1012 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1013 printf("%s: passed policy\n", __func__); 1014 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1015 1016 /* check policy type */ 1017 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1018 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1019 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1020 return EINVAL; 1021 1022 /* check privileged socket */ 1023 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1024 return EACCES; 1025 1026 /* allocation new SP entry */ 1027 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1028 return error; 1029 1030 newsp->state = IPSEC_SPSTATE_ALIVE; 1031 1032 /* clear old SP and set new SP */ 1033 KEY_FREESP(pcb_sp); 1034 *pcb_sp = newsp; 1035 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1036 printf("%s: new policy\n", __func__); 1037 kdebug_secpolicy(newsp)); 1038 1039 return 0; 1040} 1041 1042static int 1043ipsec_get_policy(pcb_sp, mp) 1044 struct secpolicy *pcb_sp; 1045 struct mbuf **mp; 1046{ 1047 1048 /* sanity check. */ 1049 if (pcb_sp == NULL || mp == NULL) 1050 return EINVAL; 1051 1052 *mp = key_sp2msg(pcb_sp); 1053 if (!*mp) { 1054 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1055 return ENOBUFS; 1056 } 1057 1058 (*mp)->m_type = MT_DATA; 1059 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1060 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1061 1062 return 0; 1063} 1064 1065int 1066ipsec4_set_policy(inp, optname, request, len, priv) 1067 struct inpcb *inp; 1068 int optname; 1069 caddr_t request; 1070 size_t len; 1071 int priv; 1072{ 1073 struct sadb_x_policy *xpl; 1074 struct secpolicy **pcb_sp; 1075 1076 /* sanity check. */ 1077 if (inp == NULL || request == NULL) 1078 return EINVAL; 1079 if (len < sizeof(*xpl)) 1080 return EINVAL; 1081 xpl = (struct sadb_x_policy *)request; 1082 1083 /* select direction */ 1084 switch (xpl->sadb_x_policy_dir) { 1085 case IPSEC_DIR_INBOUND: 1086 pcb_sp = &inp->inp_sp->sp_in; 1087 break; 1088 case IPSEC_DIR_OUTBOUND: 1089 pcb_sp = &inp->inp_sp->sp_out; 1090 break; 1091 default: 1092 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1093 xpl->sadb_x_policy_dir)); 1094 return EINVAL; 1095 } 1096 1097 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1098} 1099 1100int 1101ipsec4_get_policy(inp, request, len, mp) 1102 struct inpcb *inp; 1103 caddr_t request; 1104 size_t len; 1105 struct mbuf **mp; 1106{ 1107 struct sadb_x_policy *xpl; 1108 struct secpolicy *pcb_sp; 1109 1110 /* sanity check. */ 1111 if (inp == NULL || request == NULL || mp == NULL) 1112 return EINVAL; 1113 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1114 if (len < sizeof(*xpl)) 1115 return EINVAL; 1116 xpl = (struct sadb_x_policy *)request; 1117 1118 /* select direction */ 1119 switch (xpl->sadb_x_policy_dir) { 1120 case IPSEC_DIR_INBOUND: 1121 pcb_sp = inp->inp_sp->sp_in; 1122 break; 1123 case IPSEC_DIR_OUTBOUND: 1124 pcb_sp = inp->inp_sp->sp_out; 1125 break; 1126 default: 1127 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1128 xpl->sadb_x_policy_dir)); 1129 return EINVAL; 1130 } 1131 1132 return ipsec_get_policy(pcb_sp, mp); 1133} 1134 1135/* delete policy in PCB */ 1136int 1137ipsec4_delete_pcbpolicy(inp) 1138 struct inpcb *inp; 1139{ 1140 IPSEC_ASSERT(inp != NULL, ("null inp")); 1141 1142 if (inp->inp_sp == NULL) 1143 return 0; 1144 1145 if (inp->inp_sp->sp_in != NULL) 1146 KEY_FREESP(&inp->inp_sp->sp_in); 1147 1148 if (inp->inp_sp->sp_out != NULL) 1149 KEY_FREESP(&inp->inp_sp->sp_out); 1150 1151 ipsec_delpcbpolicy(inp->inp_sp); 1152 inp->inp_sp = NULL; 1153 1154 return 0; 1155} 1156 1157#ifdef INET6 1158int 1159ipsec6_set_policy(in6p, optname, request, len, priv) 1160 struct in6pcb *in6p; 1161 int optname; 1162 caddr_t request; 1163 size_t len; 1164 int priv; 1165{ 1166 struct sadb_x_policy *xpl; 1167 struct secpolicy **pcb_sp; 1168 1169 /* sanity check. */ 1170 if (in6p == NULL || request == NULL) 1171 return EINVAL; 1172 if (len < sizeof(*xpl)) 1173 return EINVAL; 1174 xpl = (struct sadb_x_policy *)request; 1175 1176 /* select direction */ 1177 switch (xpl->sadb_x_policy_dir) { 1178 case IPSEC_DIR_INBOUND: 1179 pcb_sp = &in6p->in6p_sp->sp_in; 1180 break; 1181 case IPSEC_DIR_OUTBOUND: 1182 pcb_sp = &in6p->in6p_sp->sp_out; 1183 break; 1184 default: 1185 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1186 xpl->sadb_x_policy_dir)); 1187 return EINVAL; 1188 } 1189 1190 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1191} 1192 1193int 1194ipsec6_get_policy(in6p, request, len, mp) 1195 struct in6pcb *in6p; 1196 caddr_t request; 1197 size_t len; 1198 struct mbuf **mp; 1199{ 1200 struct sadb_x_policy *xpl; 1201 struct secpolicy *pcb_sp; 1202 1203 /* sanity check. */ 1204 if (in6p == NULL || request == NULL || mp == NULL) 1205 return EINVAL; 1206 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1207 if (len < sizeof(*xpl)) 1208 return EINVAL; 1209 xpl = (struct sadb_x_policy *)request; 1210 1211 /* select direction */ 1212 switch (xpl->sadb_x_policy_dir) { 1213 case IPSEC_DIR_INBOUND: 1214 pcb_sp = in6p->in6p_sp->sp_in; 1215 break; 1216 case IPSEC_DIR_OUTBOUND: 1217 pcb_sp = in6p->in6p_sp->sp_out; 1218 break; 1219 default: 1220 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1221 xpl->sadb_x_policy_dir)); 1222 return EINVAL; 1223 } 1224 1225 return ipsec_get_policy(pcb_sp, mp); 1226} 1227 1228int 1229ipsec6_delete_pcbpolicy(in6p) 1230 struct in6pcb *in6p; 1231{ 1232 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1233 1234 if (in6p->in6p_sp == NULL) 1235 return 0; 1236 1237 if (in6p->in6p_sp->sp_in != NULL) 1238 KEY_FREESP(&in6p->in6p_sp->sp_in); 1239 1240 if (in6p->in6p_sp->sp_out != NULL) 1241 KEY_FREESP(&in6p->in6p_sp->sp_out); 1242 1243 ipsec_delpcbpolicy(in6p->in6p_sp); 1244 in6p->in6p_sp = NULL; 1245 1246 return 0; 1247} 1248#endif 1249 1250/* 1251 * return current level. 1252 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1253 */ 1254u_int 1255ipsec_get_reqlevel(isr) 1256 struct ipsecrequest *isr; 1257{ 1258 u_int level = 0; 1259 u_int esp_trans_deflev, esp_net_deflev; 1260 u_int ah_trans_deflev, ah_net_deflev; 1261 1262 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1263 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1264 ("af family mismatch, src %u, dst %u", 1265 isr->sp->spidx.src.sa.sa_family, 1266 isr->sp->spidx.dst.sa.sa_family)); 1267 1268/* XXX note that we have ipseclog() expanded here - code sync issue */ 1269#define IPSEC_CHECK_DEFAULT(lev) \ 1270 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1271 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1272 ? (ipsec_debug \ 1273 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1274 (lev), IPSEC_LEVEL_REQUIRE) \ 1275 : 0), \ 1276 (lev) = IPSEC_LEVEL_REQUIRE, \ 1277 (lev) \ 1278 : (lev)) 1279 1280 /* set default level */ 1281 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1282#ifdef INET 1283 case AF_INET: 1284 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1285 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1286 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1287 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1288 break; 1289#endif 1290#ifdef INET6 1291 case AF_INET6: 1292 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1293 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1294 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1295 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1296 break; 1297#endif /* INET6 */ 1298 default: 1299 panic("%s: unknown af %u", 1300 __func__, isr->sp->spidx.src.sa.sa_family); 1301 } 1302 1303#undef IPSEC_CHECK_DEFAULT 1304 1305 /* set level */ 1306 switch (isr->level) { 1307 case IPSEC_LEVEL_DEFAULT: 1308 switch (isr->saidx.proto) { 1309 case IPPROTO_ESP: 1310 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1311 level = esp_net_deflev; 1312 else 1313 level = esp_trans_deflev; 1314 break; 1315 case IPPROTO_AH: 1316 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1317 level = ah_net_deflev; 1318 else 1319 level = ah_trans_deflev; 1320 break; 1321 case IPPROTO_IPCOMP: 1322 /* 1323 * we don't really care, as IPcomp document says that 1324 * we shouldn't compress small packets 1325 */ 1326 level = IPSEC_LEVEL_USE; 1327 break; 1328 default: 1329 panic("%s: Illegal protocol defined %u\n", __func__, 1330 isr->saidx.proto); 1331 } 1332 break; 1333 1334 case IPSEC_LEVEL_USE: 1335 case IPSEC_LEVEL_REQUIRE: 1336 level = isr->level; 1337 break; 1338 case IPSEC_LEVEL_UNIQUE: 1339 level = IPSEC_LEVEL_REQUIRE; 1340 break; 1341 1342 default: 1343 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1344 } 1345 1346 return level; 1347} 1348 1349/* 1350 * Check security policy requirements against the actual 1351 * packet contents. Return one if the packet should be 1352 * reject as "invalid"; otherwiser return zero to have the 1353 * packet treated as "valid". 1354 * 1355 * OUT: 1356 * 0: valid 1357 * 1: invalid 1358 */ 1359int 1360ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1361{ 1362 struct ipsecrequest *isr; 1363 int need_auth; 1364 1365 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1366 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1367 1368 /* check policy */ 1369 switch (sp->policy) { 1370 case IPSEC_POLICY_DISCARD: 1371 return 1; 1372 case IPSEC_POLICY_BYPASS: 1373 case IPSEC_POLICY_NONE: 1374 return 0; 1375 } 1376 1377 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1378 ("invalid policy %u", sp->policy)); 1379 1380 /* XXX should compare policy against ipsec header history */ 1381 1382 need_auth = 0; 1383 for (isr = sp->req; isr != NULL; isr = isr->next) { 1384 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1385 continue; 1386 switch (isr->saidx.proto) { 1387 case IPPROTO_ESP: 1388 if ((m->m_flags & M_DECRYPTED) == 0) { 1389 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1390 printf("%s: ESP m_flags:%x\n", __func__, 1391 m->m_flags)); 1392 return 1; 1393 } 1394 1395 if (!need_auth && 1396 isr->sav != NULL && 1397 isr->sav->tdb_authalgxform != NULL && 1398 (m->m_flags & M_AUTHIPDGM) == 0) { 1399 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1400 printf("%s: ESP/AH m_flags:%x\n", __func__, 1401 m->m_flags)); 1402 return 1; 1403 } 1404 break; 1405 case IPPROTO_AH: 1406 need_auth = 1; 1407 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1408 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1409 printf("%s: AH m_flags:%x\n", __func__, 1410 m->m_flags)); 1411 return 1; 1412 } 1413 break; 1414 case IPPROTO_IPCOMP: 1415 /* 1416 * we don't really care, as IPcomp document 1417 * says that we shouldn't compress small 1418 * packets, IPComp policy should always be 1419 * treated as being in "use" level. 1420 */ 1421 break; 1422 } 1423 } 1424 return 0; /* valid */ 1425} 1426 1427/* 1428 * Check AH/ESP integrity. 1429 * This function is called from tcp_input(), udp_input(), 1430 * and {ah,esp}4_input for tunnel mode 1431 */ 1432int 1433ipsec4_in_reject(m, inp) 1434 struct mbuf *m; 1435 struct inpcb *inp; 1436{ 1437 struct secpolicy *sp; 1438 int error; 1439 int result; 1440 1441 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1442 1443 /* get SP for this packet. 1444 * When we are called from ip_forward(), we call 1445 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1446 */ 1447 if (inp == NULL) 1448 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1449 else 1450 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1451 1452 if (sp != NULL) { 1453 result = ipsec_in_reject(sp, m); 1454 if (result) 1455 newipsecstat.ips_in_polvio++; 1456 KEY_FREESP(&sp); 1457 } else { 1458 result = 0; /* XXX should be panic ? 1459 * -> No, there may be error. */ 1460 } 1461 return result; 1462} 1463 1464#ifdef INET6 1465/* 1466 * Check AH/ESP integrity. 1467 * This function is called from tcp6_input(), udp6_input(), 1468 * and {ah,esp}6_input for tunnel mode 1469 */ 1470int 1471ipsec6_in_reject(m, inp) 1472 struct mbuf *m; 1473 struct inpcb *inp; 1474{ 1475 struct secpolicy *sp = NULL; 1476 int error; 1477 int result; 1478 1479 /* sanity check */ 1480 if (m == NULL) 1481 return 0; /* XXX should be panic ? */ 1482 1483 /* get SP for this packet. 1484 * When we are called from ip_forward(), we call 1485 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1486 */ 1487 if (inp == NULL) 1488 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1489 else 1490 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1491 1492 if (sp != NULL) { 1493 result = ipsec_in_reject(sp, m); 1494 if (result) 1495 newipsecstat.ips_in_polvio++; 1496 KEY_FREESP(&sp); 1497 } else { 1498 result = 0; 1499 } 1500 return result; 1501} 1502#endif 1503 1504/* 1505 * compute the byte size to be occupied by IPsec header. 1506 * in case it is tunneled, it includes the size of outer IP header. 1507 * NOTE: SP passed is free in this function. 1508 */ 1509static size_t 1510ipsec_hdrsiz(struct secpolicy *sp) 1511{ 1512 struct ipsecrequest *isr; 1513 size_t siz; 1514 1515 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1516 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1517 1518 switch (sp->policy) { 1519 case IPSEC_POLICY_DISCARD: 1520 case IPSEC_POLICY_BYPASS: 1521 case IPSEC_POLICY_NONE: 1522 return 0; 1523 } 1524 1525 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1526 ("invalid policy %u", sp->policy)); 1527 1528 siz = 0; 1529 for (isr = sp->req; isr != NULL; isr = isr->next) { 1530 size_t clen = 0; 1531 1532 switch (isr->saidx.proto) { 1533 case IPPROTO_ESP: 1534 clen = esp_hdrsiz(isr->sav); 1535 break; 1536 case IPPROTO_AH: 1537 clen = ah_hdrsiz(isr->sav); 1538 break; 1539 case IPPROTO_IPCOMP: 1540 clen = sizeof(struct ipcomp); 1541 break; 1542 } 1543 1544 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1545 switch (isr->saidx.dst.sa.sa_family) { 1546 case AF_INET: 1547 clen += sizeof(struct ip); 1548 break; 1549#ifdef INET6 1550 case AF_INET6: 1551 clen += sizeof(struct ip6_hdr); 1552 break; 1553#endif 1554 default: 1555 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1556 "IPsec tunnel SA\n", __func__, 1557 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1558 break; 1559 } 1560 } 1561 siz += clen; 1562 } 1563 1564 return siz; 1565} 1566 1567/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1568size_t 1569ipsec4_hdrsiz(m, dir, inp) 1570 struct mbuf *m; 1571 u_int dir; 1572 struct inpcb *inp; 1573{ 1574 struct secpolicy *sp; 1575 int error; 1576 size_t size; 1577 1578 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1579 1580 /* get SP for this packet. 1581 * When we are called from ip_forward(), we call 1582 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1583 */ 1584 if (inp == NULL) 1585 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1586 else 1587 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1588 1589 if (sp != NULL) { 1590 size = ipsec_hdrsiz(sp); 1591 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1592 printf("%s: size:%lu.\n", __func__, 1593 (unsigned long)size)); 1594 1595 KEY_FREESP(&sp); 1596 } else { 1597 size = 0; /* XXX should be panic ? */ 1598 } 1599 return size; 1600} 1601 1602#ifdef INET6 1603/* This function is called from ipsec6_hdrsize_tcp(), 1604 * and maybe from ip6_forward.() 1605 */ 1606size_t 1607ipsec6_hdrsiz(m, dir, in6p) 1608 struct mbuf *m; 1609 u_int dir; 1610 struct in6pcb *in6p; 1611{ 1612 struct secpolicy *sp; 1613 int error; 1614 size_t size; 1615 1616 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1617 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1618 ("socket w/o inpcb")); 1619 1620 /* get SP for this packet */ 1621 /* XXX Is it right to call with IP_FORWARDING. */ 1622 if (in6p == NULL) 1623 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1624 else 1625 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1626 1627 if (sp == NULL) 1628 return 0; 1629 size = ipsec_hdrsiz(sp); 1630 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1631 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1632 KEY_FREESP(&sp); 1633 1634 return size; 1635} 1636#endif /*INET6*/ 1637 1638/* 1639 * Check the variable replay window. 1640 * ipsec_chkreplay() performs replay check before ICV verification. 1641 * ipsec_updatereplay() updates replay bitmap. This must be called after 1642 * ICV verification (it also performs replay check, which is usually done 1643 * beforehand). 1644 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1645 * 1646 * based on RFC 2401. 1647 */ 1648int 1649ipsec_chkreplay(seq, sav) 1650 u_int32_t seq; 1651 struct secasvar *sav; 1652{ 1653 const struct secreplay *replay; 1654 u_int32_t diff; 1655 int fr; 1656 u_int32_t wsizeb; /* constant: bits of window size */ 1657 int frlast; /* constant: last frame */ 1658 1659 IPSEC_SPLASSERT_SOFTNET(__func__); 1660 1661 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1662 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1663 1664 replay = sav->replay; 1665 1666 if (replay->wsize == 0) 1667 return 1; /* no need to check replay. */ 1668 1669 /* constant */ 1670 frlast = replay->wsize - 1; 1671 wsizeb = replay->wsize << 3; 1672 1673 /* sequence number of 0 is invalid */ 1674 if (seq == 0) 1675 return 0; 1676 1677 /* first time is always okay */ 1678 if (replay->count == 0) 1679 return 1; 1680 1681 if (seq > replay->lastseq) { 1682 /* larger sequences are okay */ 1683 return 1; 1684 } else { 1685 /* seq is equal or less than lastseq. */ 1686 diff = replay->lastseq - seq; 1687 1688 /* over range to check, i.e. too old or wrapped */ 1689 if (diff >= wsizeb) 1690 return 0; 1691 1692 fr = frlast - diff / 8; 1693 1694 /* this packet already seen ? */ 1695 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1696 return 0; 1697 1698 /* out of order but good */ 1699 return 1; 1700 } 1701} 1702 1703/* 1704 * check replay counter whether to update or not. 1705 * OUT: 0: OK 1706 * 1: NG 1707 */ 1708int 1709ipsec_updatereplay(seq, sav) 1710 u_int32_t seq; 1711 struct secasvar *sav; 1712{ 1713 struct secreplay *replay; 1714 u_int32_t diff; 1715 int fr; 1716 u_int32_t wsizeb; /* constant: bits of window size */ 1717 int frlast; /* constant: last frame */ 1718 1719 IPSEC_SPLASSERT_SOFTNET(__func__); 1720 1721 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1722 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1723 1724 replay = sav->replay; 1725 1726 if (replay->wsize == 0) 1727 goto ok; /* no need to check replay. */ 1728 1729 /* constant */ 1730 frlast = replay->wsize - 1; 1731 wsizeb = replay->wsize << 3; 1732 1733 /* sequence number of 0 is invalid */ 1734 if (seq == 0) 1735 return 1; 1736 1737 /* first time */ 1738 if (replay->count == 0) { 1739 replay->lastseq = seq; 1740 bzero(replay->bitmap, replay->wsize); 1741 (replay->bitmap)[frlast] = 1; 1742 goto ok; 1743 } 1744 1745 if (seq > replay->lastseq) { 1746 /* seq is larger than lastseq. */ 1747 diff = seq - replay->lastseq; 1748 1749 /* new larger sequence number */ 1750 if (diff < wsizeb) { 1751 /* In window */ 1752 /* set bit for this packet */ 1753 vshiftl(replay->bitmap, diff, replay->wsize); 1754 (replay->bitmap)[frlast] |= 1; 1755 } else { 1756 /* this packet has a "way larger" */ 1757 bzero(replay->bitmap, replay->wsize); 1758 (replay->bitmap)[frlast] = 1; 1759 } 1760 replay->lastseq = seq; 1761 1762 /* larger is good */ 1763 } else { 1764 /* seq is equal or less than lastseq. */ 1765 diff = replay->lastseq - seq; 1766 1767 /* over range to check, i.e. too old or wrapped */ 1768 if (diff >= wsizeb) 1769 return 1; 1770 1771 fr = frlast - diff / 8; 1772 1773 /* this packet already seen ? */ 1774 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1775 return 1; 1776 1777 /* mark as seen */ 1778 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1779 1780 /* out of order but good */ 1781 } 1782 1783ok: 1784 if (replay->count == ~0) { 1785 1786 /* set overflow flag */ 1787 replay->overflow++; 1788 1789 /* don't increment, no more packets accepted */ 1790 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1791 return 1; 1792 1793 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1794 __func__, replay->overflow, ipsec_logsastr(sav))); 1795 } 1796 1797 replay->count++; 1798 1799 return 0; 1800} 1801 1802/* 1803 * shift variable length buffer to left. 1804 * IN: bitmap: pointer to the buffer 1805 * nbit: the number of to shift. 1806 * wsize: buffer size (bytes). 1807 */ 1808static void 1809vshiftl(bitmap, nbit, wsize) 1810 unsigned char *bitmap; 1811 int nbit, wsize; 1812{ 1813 int s, j, i; 1814 unsigned char over; 1815 1816 for (j = 0; j < nbit; j += 8) { 1817 s = (nbit - j < 8) ? (nbit - j): 8; 1818 bitmap[0] <<= s; 1819 for (i = 1; i < wsize; i++) { 1820 over = (bitmap[i] >> (8 - s)); 1821 bitmap[i] <<= s; 1822 bitmap[i-1] |= over; 1823 } 1824 } 1825 1826 return; 1827} 1828 1829/* Return a printable string for the IPv4 address. */ 1830static char * 1831inet_ntoa4(struct in_addr ina) 1832{ 1833 static char buf[4][4 * sizeof "123" + 4]; 1834 unsigned char *ucp = (unsigned char *) &ina; 1835 static int i = 3; 1836 1837 /* XXX-BZ returns static buffer. */ 1838 i = (i + 1) % 4; 1839 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1840 ucp[2] & 0xff, ucp[3] & 0xff); 1841 return (buf[i]); 1842} 1843 1844/* Return a printable string for the address. */ 1845char * 1846ipsec_address(union sockaddr_union* sa) 1847{ 1848#ifdef INET6 1849 char ip6buf[INET6_ADDRSTRLEN]; 1850#endif 1851 switch (sa->sa.sa_family) { 1852#ifdef INET 1853 case AF_INET: 1854 return inet_ntoa4(sa->sin.sin_addr); 1855#endif /* INET */ 1856 1857#ifdef INET6 1858 case AF_INET6: 1859 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1860#endif /* INET6 */ 1861 1862 default: 1863 return "(unknown address family)"; 1864 } 1865} 1866 1867const char * 1868ipsec_logsastr(sav) 1869 struct secasvar *sav; 1870{ 1871 static char buf[256]; 1872 char *p; 1873 struct secasindex *saidx = &sav->sah->saidx; 1874 1875 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1876 ("address family mismatch")); 1877 1878 p = buf; 1879 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1880 while (p && *p) 1881 p++; 1882 /* NB: only use ipsec_address on one address at a time */ 1883 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1884 ipsec_address(&saidx->src)); 1885 while (p && *p) 1886 p++; 1887 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1888 ipsec_address(&saidx->dst)); 1889 1890 return buf; 1891} 1892 1893void 1894ipsec_dumpmbuf(m) 1895 struct mbuf *m; 1896{ 1897 int totlen; 1898 int i; 1899 u_char *p; 1900 1901 totlen = 0; 1902 printf("---\n"); 1903 while (m) { 1904 p = mtod(m, u_char *); 1905 for (i = 0; i < m->m_len; i++) { 1906 printf("%02x ", p[i]); 1907 totlen++; 1908 if (totlen % 16 == 0) 1909 printf("\n"); 1910 } 1911 m = m->m_next; 1912 } 1913 if (totlen % 16 != 0) 1914 printf("\n"); 1915 printf("---\n"); 1916} 1917 1918static void 1919ipsec_attach(void) 1920{ 1921 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1922 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1923} 1924SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1925 1926 1927/* XXX this stuff doesn't belong here... */ 1928 1929static struct xformsw* xforms = NULL; 1930 1931/* 1932 * Register a transform; typically at system startup. 1933 */ 1934void 1935xform_register(struct xformsw* xsp) 1936{ 1937 xsp->xf_next = xforms; 1938 xforms = xsp; 1939} 1940 1941/* 1942 * Initialize transform support in an sav. 1943 */ 1944int 1945xform_init(struct secasvar *sav, int xftype) 1946{ 1947 struct xformsw *xsp; 1948 1949 if (sav->tdb_xform != NULL) /* previously initialized */ 1950 return 0; 1951 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1952 if (xsp->xf_type == xftype) 1953 return (*xsp->xf_init)(sav, xsp); 1954 return EINVAL; 1955} 1956