ipsec.c revision 157634
1/* $FreeBSD: head/sys/netipsec/ipsec.c 157634 2006-04-10 15:04:36Z pjd $ */ 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/protosw.h> 47#include <sys/socket.h> 48#include <sys/socketvar.h> 49#include <sys/errno.h> 50#include <sys/time.h> 51#include <sys/kernel.h> 52#include <sys/syslog.h> 53#include <sys/sysctl.h> 54#include <sys/proc.h> 55 56#include <net/if.h> 57#include <net/route.h> 58 59#include <netinet/in.h> 60#include <netinet/in_systm.h> 61#include <netinet/ip.h> 62#include <netinet/ip_var.h> 63#include <netinet/in_var.h> 64#include <netinet/udp.h> 65#include <netinet/udp_var.h> 66#include <netinet/tcp.h> 67#include <netinet/udp.h> 68 69#include <netinet/ip6.h> 70#ifdef INET6 71#include <netinet6/ip6_var.h> 72#endif 73#include <netinet/in_pcb.h> 74#ifdef INET6 75#include <netinet/icmp6.h> 76#endif 77 78#include <netipsec/ipsec.h> 79#ifdef INET6 80#include <netipsec/ipsec6.h> 81#endif 82#include <netipsec/ah_var.h> 83#include <netipsec/esp_var.h> 84#include <netipsec/ipcomp.h> /*XXX*/ 85#include <netipsec/ipcomp_var.h> 86 87#include <netipsec/key.h> 88#include <netipsec/keydb.h> 89#include <netipsec/key_debug.h> 90 91#include <netipsec/xform.h> 92 93#include <machine/in_cksum.h> 94 95#ifdef IPSEC_DEBUG 96int ipsec_debug = 1; 97#else 98int ipsec_debug = 0; 99#endif 100 101/* NB: name changed so netstat doesn't use it */ 102struct newipsecstat newipsecstat; 103int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 104int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 105int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 106int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 107int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 108int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 109struct secpolicy ip4_def_policy; 110int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 111int ip4_esp_randpad = -1; 112/* 113 * Crypto support requirements: 114 * 115 * 1 require hardware support 116 * -1 require software support 117 * 0 take anything 118 */ 119int crypto_support = 0; 120 121SYSCTL_DECL(_net_inet_ipsec); 122 123/* net.inet.ipsec */ 124SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 125 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 126SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 127 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 128SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 129 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 130SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 131 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 132SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 133 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 134SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 135 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 136SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 137 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 138SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 139 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 140SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 141 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 142SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 143 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 144SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 145 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 146SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 147 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 148SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 149 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 150 151#ifdef REGRESSION 152/* 153 * When set to 1, IPsec will send packets with the same sequence number. 154 * This allows to verify if the other side has proper replay attacks detection. 155 */ 156int ipsec_replay = 0; 157SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_replay, CTLFLAG_RW, &ipsec_replay, 0, 158 "Emulate replay attack"); 159/* 160 * When set 1, IPsec will send packets with corrupted HMAC. 161 * This allows to verify if the other side properly detects modified packets. 162 */ 163int ipsec_integrity = 0; 164SYSCTL_INT(_net_inet_ipsec, OID_AUTO, test_integrity, CTLFLAG_RW, 165 &ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 166#endif 167 168#ifdef INET6 169int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 170int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 171int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 172int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 173int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 174int ip6_esp_randpad = -1; 175 176SYSCTL_DECL(_net_inet6_ipsec6); 177 178/* net.inet6.ipsec6 */ 179#ifdef COMPAT_KAME 180SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 181 0,0, compat_ipsecstats_sysctl, "S", ""); 182#endif /* COMPAT_KAME */ 183SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 184 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 185SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 186 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 187SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 188 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 189SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 190 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 191SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 192 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 193SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 194 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 195SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 196 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 197SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 198 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 199#endif /* INET6 */ 200 201static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 202#ifdef INET6 203static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 204#endif 205static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 206static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 207static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 208#ifdef INET6 209static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 210static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 211#endif 212static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 213static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 214static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 215 int optname, caddr_t request, size_t len, int priv)); 216static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 217static void vshiftl __P((unsigned char *, int, int)); 218static size_t ipsec_hdrsiz __P((struct secpolicy *)); 219 220MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 221 222/* 223 * Return a held reference to the default SP. 224 */ 225static struct secpolicy * 226key_allocsp_default(const char* where, int tag) 227{ 228 struct secpolicy *sp; 229 230 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 231 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 232 233 sp = &ip4_def_policy; 234 if (sp->policy != IPSEC_POLICY_DISCARD && 235 sp->policy != IPSEC_POLICY_NONE) { 236 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 237 sp->policy, IPSEC_POLICY_NONE)); 238 sp->policy = IPSEC_POLICY_NONE; 239 } 240 key_addref(sp); 241 242 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 243 printf("DP key_allocsp_default returns SP:%p (%u)\n", 244 sp, sp->refcnt)); 245 return sp; 246} 247#define KEY_ALLOCSP_DEFAULT() \ 248 key_allocsp_default(__FILE__, __LINE__) 249 250/* 251 * For OUTBOUND packet having a socket. Searching SPD for packet, 252 * and return a pointer to SP. 253 * OUT: NULL: no apropreate SP found, the following value is set to error. 254 * 0 : bypass 255 * EACCES : discard packet. 256 * ENOENT : ipsec_acquire() in progress, maybe. 257 * others : error occured. 258 * others: a pointer to SP 259 * 260 * NOTE: IPv6 mapped adddress concern is implemented here. 261 */ 262struct secpolicy * 263ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 264{ 265 struct secpolicy *sp; 266 267 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 268 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 269 ("invalid direction %u", dir)); 270 271 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 272 if (sp == NULL) /*XXX????*/ 273 sp = KEY_ALLOCSP_DEFAULT(); 274 IPSEC_ASSERT(sp != NULL, ("null SP")); 275 return sp; 276} 277 278/* 279 * For OUTBOUND packet having a socket. Searching SPD for packet, 280 * and return a pointer to SP. 281 * OUT: NULL: no apropreate SP found, the following value is set to error. 282 * 0 : bypass 283 * EACCES : discard packet. 284 * ENOENT : ipsec_acquire() in progress, maybe. 285 * others : error occured. 286 * others: a pointer to SP 287 * 288 * NOTE: IPv6 mapped adddress concern is implemented here. 289 */ 290struct secpolicy * 291ipsec_getpolicybysock(m, dir, inp, error) 292 struct mbuf *m; 293 u_int dir; 294 struct inpcb *inp; 295 int *error; 296{ 297 struct inpcbpolicy *pcbsp = NULL; 298 struct secpolicy *currsp = NULL; /* policy on socket */ 299 struct secpolicy *sp; 300 301 IPSEC_ASSERT(m != NULL, ("null mbuf")); 302 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 303 IPSEC_ASSERT(error != NULL, ("null error")); 304 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 305 ("invalid direction %u", dir)); 306 307 /* set spidx in pcb */ 308 if (inp->inp_vflag & INP_IPV6PROTO) { 309#ifdef INET6 310 *error = ipsec6_setspidx_in6pcb(m, inp); 311 pcbsp = inp->in6p_sp; 312#else 313 *error = EINVAL; /* should not happen */ 314#endif 315 } else { 316 *error = ipsec4_setspidx_inpcb(m, inp); 317 pcbsp = inp->inp_sp; 318 } 319 if (*error) 320 return NULL; 321 322 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 323 switch (dir) { 324 case IPSEC_DIR_INBOUND: 325 currsp = pcbsp->sp_in; 326 break; 327 case IPSEC_DIR_OUTBOUND: 328 currsp = pcbsp->sp_out; 329 break; 330 } 331 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 332 333 if (pcbsp->priv) { /* when privilieged socket */ 334 switch (currsp->policy) { 335 case IPSEC_POLICY_BYPASS: 336 case IPSEC_POLICY_IPSEC: 337 key_addref(currsp); 338 sp = currsp; 339 break; 340 341 case IPSEC_POLICY_ENTRUST: 342 /* look for a policy in SPD */ 343 sp = KEY_ALLOCSP(&currsp->spidx, dir); 344 if (sp == NULL) /* no SP found */ 345 sp = KEY_ALLOCSP_DEFAULT(); 346 break; 347 348 default: 349 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 350 __func__, currsp->policy)); 351 *error = EINVAL; 352 return NULL; 353 } 354 } else { /* unpriv, SPD has policy */ 355 sp = KEY_ALLOCSP(&currsp->spidx, dir); 356 if (sp == NULL) { /* no SP found */ 357 switch (currsp->policy) { 358 case IPSEC_POLICY_BYPASS: 359 ipseclog((LOG_ERR, "%s: Illegal policy for " 360 "non-priviliged defined %d\n", 361 __func__, currsp->policy)); 362 *error = EINVAL; 363 return NULL; 364 365 case IPSEC_POLICY_ENTRUST: 366 sp = KEY_ALLOCSP_DEFAULT(); 367 break; 368 369 case IPSEC_POLICY_IPSEC: 370 key_addref(currsp); 371 sp = currsp; 372 break; 373 374 default: 375 ipseclog((LOG_ERR, "%s: Invalid policy for " 376 "PCB %d\n", __func__, currsp->policy)); 377 *error = EINVAL; 378 return NULL; 379 } 380 } 381 } 382 IPSEC_ASSERT(sp != NULL, 383 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 384 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 385 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 386 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 387 return sp; 388} 389 390/* 391 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 392 * and return a pointer to SP. 393 * OUT: positive: a pointer to the entry for security policy leaf matched. 394 * NULL: no apropreate SP found, the following value is set to error. 395 * 0 : bypass 396 * EACCES : discard packet. 397 * ENOENT : ipsec_acquire() in progress, maybe. 398 * others : error occured. 399 */ 400struct secpolicy * 401ipsec_getpolicybyaddr(m, dir, flag, error) 402 struct mbuf *m; 403 u_int dir; 404 int flag; 405 int *error; 406{ 407 struct secpolicyindex spidx; 408 struct secpolicy *sp; 409 410 IPSEC_ASSERT(m != NULL, ("null mbuf")); 411 IPSEC_ASSERT(error != NULL, ("null error")); 412 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 413 ("invalid direction %u", dir)); 414 415 sp = NULL; 416 if (key_havesp(dir)) { 417 /* Make an index to look for a policy. */ 418 *error = ipsec_setspidx(m, &spidx, 419 (flag & IP_FORWARDING) ? 0 : 1); 420 if (*error != 0) { 421 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 422 __func__, dir, flag)); 423 return NULL; 424 } 425 spidx.dir = dir; 426 427 sp = KEY_ALLOCSP(&spidx, dir); 428 } 429 if (sp == NULL) /* no SP found, use system default */ 430 sp = KEY_ALLOCSP_DEFAULT(); 431 IPSEC_ASSERT(sp != NULL, ("null SP")); 432 return sp; 433} 434 435struct secpolicy * 436ipsec4_checkpolicy(m, dir, flag, error, inp) 437 struct mbuf *m; 438 u_int dir, flag; 439 int *error; 440 struct inpcb *inp; 441{ 442 struct secpolicy *sp; 443 444 *error = 0; 445 if (inp == NULL) 446 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 447 else 448 sp = ipsec_getpolicybysock(m, dir, inp, error); 449 if (sp == NULL) { 450 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 451 newipsecstat.ips_out_inval++; 452 return NULL; 453 } 454 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 455 switch (sp->policy) { 456 case IPSEC_POLICY_ENTRUST: 457 default: 458 printf("%s: invalid policy %u\n", __func__, sp->policy); 459 /* fall thru... */ 460 case IPSEC_POLICY_DISCARD: 461 newipsecstat.ips_out_polvio++; 462 *error = -EINVAL; /* packet is discarded by caller */ 463 break; 464 case IPSEC_POLICY_BYPASS: 465 case IPSEC_POLICY_NONE: 466 KEY_FREESP(&sp); 467 sp = NULL; /* NB: force NULL result */ 468 break; 469 case IPSEC_POLICY_IPSEC: 470 if (sp->req == NULL) /* acquire an SA */ 471 *error = key_spdacquire(sp); 472 break; 473 } 474 if (*error != 0) { 475 KEY_FREESP(&sp); 476 sp = NULL; 477 } 478 return sp; 479} 480 481static int 482ipsec4_setspidx_inpcb(m, pcb) 483 struct mbuf *m; 484 struct inpcb *pcb; 485{ 486 int error; 487 488 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 489 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 490 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 491 ("null sp_in || sp_out")); 492 493 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 494 if (error == 0) { 495 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 496 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 497 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 498 } else { 499 bzero(&pcb->inp_sp->sp_in->spidx, 500 sizeof (pcb->inp_sp->sp_in->spidx)); 501 bzero(&pcb->inp_sp->sp_out->spidx, 502 sizeof (pcb->inp_sp->sp_in->spidx)); 503 } 504 return error; 505} 506 507#ifdef INET6 508static int 509ipsec6_setspidx_in6pcb(m, pcb) 510 struct mbuf *m; 511 struct in6pcb *pcb; 512{ 513 struct secpolicyindex *spidx; 514 int error; 515 516 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 517 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 518 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 519 ("null sp_in || sp_out")); 520 521 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 522 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 523 524 spidx = &pcb->in6p_sp->sp_in->spidx; 525 error = ipsec_setspidx(m, spidx, 1); 526 if (error) 527 goto bad; 528 spidx->dir = IPSEC_DIR_INBOUND; 529 530 spidx = &pcb->in6p_sp->sp_out->spidx; 531 error = ipsec_setspidx(m, spidx, 1); 532 if (error) 533 goto bad; 534 spidx->dir = IPSEC_DIR_OUTBOUND; 535 536 return 0; 537 538bad: 539 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 540 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 541 return error; 542} 543#endif 544 545/* 546 * configure security policy index (src/dst/proto/sport/dport) 547 * by looking at the content of mbuf. 548 * the caller is responsible for error recovery (like clearing up spidx). 549 */ 550static int 551ipsec_setspidx(m, spidx, needport) 552 struct mbuf *m; 553 struct secpolicyindex *spidx; 554 int needport; 555{ 556 struct ip *ip = NULL; 557 struct ip ipbuf; 558 u_int v; 559 struct mbuf *n; 560 int len; 561 int error; 562 563 IPSEC_ASSERT(m != NULL, ("null mbuf")); 564 565 /* 566 * validate m->m_pkthdr.len. we see incorrect length if we 567 * mistakenly call this function with inconsistent mbuf chain 568 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 569 */ 570 len = 0; 571 for (n = m; n; n = n->m_next) 572 len += n->m_len; 573 if (m->m_pkthdr.len != len) { 574 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 575 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 576 __func__, len, m->m_pkthdr.len)); 577 return EINVAL; 578 } 579 580 if (m->m_pkthdr.len < sizeof(struct ip)) { 581 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 582 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 583 __func__, m->m_pkthdr.len)); 584 return EINVAL; 585 } 586 587 if (m->m_len >= sizeof(*ip)) 588 ip = mtod(m, struct ip *); 589 else { 590 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 591 ip = &ipbuf; 592 } 593#ifdef _IP_VHL 594 v = _IP_VHL_V(ip->ip_vhl); 595#else 596 v = ip->ip_v; 597#endif 598 switch (v) { 599 case 4: 600 error = ipsec4_setspidx_ipaddr(m, spidx); 601 if (error) 602 return error; 603 ipsec4_get_ulp(m, spidx, needport); 604 return 0; 605#ifdef INET6 606 case 6: 607 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 608 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 609 printf("%s: pkthdr len(%d) too small (v6), " 610 "ignored\n", __func__, m->m_pkthdr.len)); 611 return EINVAL; 612 } 613 error = ipsec6_setspidx_ipaddr(m, spidx); 614 if (error) 615 return error; 616 ipsec6_get_ulp(m, spidx, needport); 617 return 0; 618#endif 619 default: 620 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 621 printf("%s: " "unknown IP version %u, ignored.\n", 622 __func__, v)); 623 return EINVAL; 624 } 625} 626 627static void 628ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 629{ 630 u_int8_t nxt; 631 int off; 632 633 /* sanity check */ 634 IPSEC_ASSERT(m != NULL, ("null mbuf")); 635 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 636 637 /* NB: ip_input() flips it into host endian XXX need more checking */ 638 if (m->m_len < sizeof (struct ip)) { 639 struct ip *ip = mtod(m, struct ip *); 640 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 641 goto done; 642#ifdef _IP_VHL 643 off = _IP_VHL_HL(ip->ip_vhl) << 2; 644#else 645 off = ip->ip_hl << 2; 646#endif 647 nxt = ip->ip_p; 648 } else { 649 struct ip ih; 650 651 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 652 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 653 goto done; 654#ifdef _IP_VHL 655 off = _IP_VHL_HL(ih.ip_vhl) << 2; 656#else 657 off = ih.ip_hl << 2; 658#endif 659 nxt = ih.ip_p; 660 } 661 662 while (off < m->m_pkthdr.len) { 663 struct ip6_ext ip6e; 664 struct tcphdr th; 665 struct udphdr uh; 666 667 switch (nxt) { 668 case IPPROTO_TCP: 669 spidx->ul_proto = nxt; 670 if (!needport) 671 goto done_proto; 672 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 673 goto done; 674 m_copydata(m, off, sizeof (th), (caddr_t) &th); 675 spidx->src.sin.sin_port = th.th_sport; 676 spidx->dst.sin.sin_port = th.th_dport; 677 return; 678 case IPPROTO_UDP: 679 spidx->ul_proto = nxt; 680 if (!needport) 681 goto done_proto; 682 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 683 goto done; 684 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 685 spidx->src.sin.sin_port = uh.uh_sport; 686 spidx->dst.sin.sin_port = uh.uh_dport; 687 return; 688 case IPPROTO_AH: 689 if (off + sizeof(ip6e) > m->m_pkthdr.len) 690 goto done; 691 /* XXX sigh, this works but is totally bogus */ 692 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 693 off += (ip6e.ip6e_len + 2) << 2; 694 nxt = ip6e.ip6e_nxt; 695 break; 696 case IPPROTO_ICMP: 697 default: 698 /* XXX intermediate headers??? */ 699 spidx->ul_proto = nxt; 700 goto done_proto; 701 } 702 } 703done: 704 spidx->ul_proto = IPSEC_ULPROTO_ANY; 705done_proto: 706 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 707 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 708} 709 710/* assumes that m is sane */ 711static int 712ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 713{ 714 static const struct sockaddr_in template = { 715 sizeof (struct sockaddr_in), 716 AF_INET, 717 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 718 }; 719 720 spidx->src.sin = template; 721 spidx->dst.sin = template; 722 723 if (m->m_len < sizeof (struct ip)) { 724 m_copydata(m, offsetof(struct ip, ip_src), 725 sizeof (struct in_addr), 726 (caddr_t) &spidx->src.sin.sin_addr); 727 m_copydata(m, offsetof(struct ip, ip_dst), 728 sizeof (struct in_addr), 729 (caddr_t) &spidx->dst.sin.sin_addr); 730 } else { 731 struct ip *ip = mtod(m, struct ip *); 732 spidx->src.sin.sin_addr = ip->ip_src; 733 spidx->dst.sin.sin_addr = ip->ip_dst; 734 } 735 736 spidx->prefs = sizeof(struct in_addr) << 3; 737 spidx->prefd = sizeof(struct in_addr) << 3; 738 739 return 0; 740} 741 742#ifdef INET6 743static void 744ipsec6_get_ulp(m, spidx, needport) 745 struct mbuf *m; 746 struct secpolicyindex *spidx; 747 int needport; 748{ 749 int off, nxt; 750 struct tcphdr th; 751 struct udphdr uh; 752 753 /* sanity check */ 754 if (m == NULL) 755 panic("%s: NULL pointer was passed.\n", __func__); 756 757 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 758 printf("%s:\n", __func__); kdebug_mbuf(m)); 759 760 /* set default */ 761 spidx->ul_proto = IPSEC_ULPROTO_ANY; 762 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 763 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 764 765 nxt = -1; 766 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 767 if (off < 0 || m->m_pkthdr.len < off) 768 return; 769 770 switch (nxt) { 771 case IPPROTO_TCP: 772 spidx->ul_proto = nxt; 773 if (!needport) 774 break; 775 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 776 break; 777 m_copydata(m, off, sizeof(th), (caddr_t)&th); 778 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 779 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 780 break; 781 case IPPROTO_UDP: 782 spidx->ul_proto = nxt; 783 if (!needport) 784 break; 785 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 786 break; 787 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 788 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 789 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 790 break; 791 case IPPROTO_ICMPV6: 792 default: 793 /* XXX intermediate headers??? */ 794 spidx->ul_proto = nxt; 795 break; 796 } 797} 798 799/* assumes that m is sane */ 800static int 801ipsec6_setspidx_ipaddr(m, spidx) 802 struct mbuf *m; 803 struct secpolicyindex *spidx; 804{ 805 struct ip6_hdr *ip6 = NULL; 806 struct ip6_hdr ip6buf; 807 struct sockaddr_in6 *sin6; 808 809 if (m->m_len >= sizeof(*ip6)) 810 ip6 = mtod(m, struct ip6_hdr *); 811 else { 812 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 813 ip6 = &ip6buf; 814 } 815 816 sin6 = (struct sockaddr_in6 *)&spidx->src; 817 bzero(sin6, sizeof(*sin6)); 818 sin6->sin6_family = AF_INET6; 819 sin6->sin6_len = sizeof(struct sockaddr_in6); 820 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 821 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 822 sin6->sin6_addr.s6_addr16[1] = 0; 823 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 824 } 825 spidx->prefs = sizeof(struct in6_addr) << 3; 826 827 sin6 = (struct sockaddr_in6 *)&spidx->dst; 828 bzero(sin6, sizeof(*sin6)); 829 sin6->sin6_family = AF_INET6; 830 sin6->sin6_len = sizeof(struct sockaddr_in6); 831 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 832 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 833 sin6->sin6_addr.s6_addr16[1] = 0; 834 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 835 } 836 spidx->prefd = sizeof(struct in6_addr) << 3; 837 838 return 0; 839} 840#endif 841 842static void 843ipsec_delpcbpolicy(p) 844 struct inpcbpolicy *p; 845{ 846 free(p, M_IPSEC_INPCB); 847} 848 849/* initialize policy in PCB */ 850int 851ipsec_init_policy(so, pcb_sp) 852 struct socket *so; 853 struct inpcbpolicy **pcb_sp; 854{ 855 struct inpcbpolicy *new; 856 857 /* sanity check. */ 858 if (so == NULL || pcb_sp == NULL) 859 panic("%s: NULL pointer was passed.\n", __func__); 860 861 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 862 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 863 if (new == NULL) { 864 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 865 return ENOBUFS; 866 } 867 868 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 869 870 if ((new->sp_in = KEY_NEWSP()) == NULL) { 871 ipsec_delpcbpolicy(new); 872 return ENOBUFS; 873 } 874 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 875 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 876 877 if ((new->sp_out = KEY_NEWSP()) == NULL) { 878 KEY_FREESP(&new->sp_in); 879 ipsec_delpcbpolicy(new); 880 return ENOBUFS; 881 } 882 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 883 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 884 885 *pcb_sp = new; 886 887 return 0; 888} 889 890/* copy old ipsec policy into new */ 891int 892ipsec_copy_policy(old, new) 893 struct inpcbpolicy *old, *new; 894{ 895 struct secpolicy *sp; 896 897 sp = ipsec_deepcopy_policy(old->sp_in); 898 if (sp) { 899 KEY_FREESP(&new->sp_in); 900 new->sp_in = sp; 901 } else 902 return ENOBUFS; 903 904 sp = ipsec_deepcopy_policy(old->sp_out); 905 if (sp) { 906 KEY_FREESP(&new->sp_out); 907 new->sp_out = sp; 908 } else 909 return ENOBUFS; 910 911 new->priv = old->priv; 912 913 return 0; 914} 915 916struct ipsecrequest * 917ipsec_newisr(void) 918{ 919 struct ipsecrequest *p; 920 921 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 922 if (p != NULL) 923 IPSECREQUEST_LOCK_INIT(p); 924 return p; 925} 926 927void 928ipsec_delisr(struct ipsecrequest *p) 929{ 930 IPSECREQUEST_LOCK_DESTROY(p); 931 free(p, M_IPSEC_SR); 932} 933 934/* deep-copy a policy in PCB */ 935static struct secpolicy * 936ipsec_deepcopy_policy(src) 937 struct secpolicy *src; 938{ 939 struct ipsecrequest *newchain = NULL; 940 struct ipsecrequest *p; 941 struct ipsecrequest **q; 942 struct ipsecrequest *r; 943 struct secpolicy *dst; 944 945 if (src == NULL) 946 return NULL; 947 dst = KEY_NEWSP(); 948 if (dst == NULL) 949 return NULL; 950 951 /* 952 * deep-copy IPsec request chain. This is required since struct 953 * ipsecrequest is not reference counted. 954 */ 955 q = &newchain; 956 for (p = src->req; p; p = p->next) { 957 *q = ipsec_newisr(); 958 if (*q == NULL) 959 goto fail; 960 (*q)->saidx.proto = p->saidx.proto; 961 (*q)->saidx.mode = p->saidx.mode; 962 (*q)->level = p->level; 963 (*q)->saidx.reqid = p->saidx.reqid; 964 965 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 966 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 967 968 (*q)->sp = dst; 969 970 q = &((*q)->next); 971 } 972 973 dst->req = newchain; 974 dst->state = src->state; 975 dst->policy = src->policy; 976 /* do not touch the refcnt fields */ 977 978 return dst; 979 980fail: 981 for (p = newchain; p; p = r) { 982 r = p->next; 983 ipsec_delisr(p); 984 p = NULL; 985 } 986 return NULL; 987} 988 989/* set policy and ipsec request if present. */ 990static int 991ipsec_set_policy(pcb_sp, optname, request, len, priv) 992 struct secpolicy **pcb_sp; 993 int optname; 994 caddr_t request; 995 size_t len; 996 int priv; 997{ 998 struct sadb_x_policy *xpl; 999 struct secpolicy *newsp = NULL; 1000 int error; 1001 1002 /* sanity check. */ 1003 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1004 return EINVAL; 1005 if (len < sizeof(*xpl)) 1006 return EINVAL; 1007 xpl = (struct sadb_x_policy *)request; 1008 1009 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1010 printf("%s: passed policy\n", __func__); 1011 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1012 1013 /* check policy type */ 1014 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1015 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1016 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1017 return EINVAL; 1018 1019 /* check privileged socket */ 1020 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1021 return EACCES; 1022 1023 /* allocation new SP entry */ 1024 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1025 return error; 1026 1027 newsp->state = IPSEC_SPSTATE_ALIVE; 1028 1029 /* clear old SP and set new SP */ 1030 KEY_FREESP(pcb_sp); 1031 *pcb_sp = newsp; 1032 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1033 printf("%s: new policy\n", __func__); 1034 kdebug_secpolicy(newsp)); 1035 1036 return 0; 1037} 1038 1039static int 1040ipsec_get_policy(pcb_sp, mp) 1041 struct secpolicy *pcb_sp; 1042 struct mbuf **mp; 1043{ 1044 1045 /* sanity check. */ 1046 if (pcb_sp == NULL || mp == NULL) 1047 return EINVAL; 1048 1049 *mp = key_sp2msg(pcb_sp); 1050 if (!*mp) { 1051 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1052 return ENOBUFS; 1053 } 1054 1055 (*mp)->m_type = MT_DATA; 1056 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1057 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1058 1059 return 0; 1060} 1061 1062int 1063ipsec4_set_policy(inp, optname, request, len, priv) 1064 struct inpcb *inp; 1065 int optname; 1066 caddr_t request; 1067 size_t len; 1068 int priv; 1069{ 1070 struct sadb_x_policy *xpl; 1071 struct secpolicy **pcb_sp; 1072 1073 /* sanity check. */ 1074 if (inp == NULL || request == NULL) 1075 return EINVAL; 1076 if (len < sizeof(*xpl)) 1077 return EINVAL; 1078 xpl = (struct sadb_x_policy *)request; 1079 1080 /* select direction */ 1081 switch (xpl->sadb_x_policy_dir) { 1082 case IPSEC_DIR_INBOUND: 1083 pcb_sp = &inp->inp_sp->sp_in; 1084 break; 1085 case IPSEC_DIR_OUTBOUND: 1086 pcb_sp = &inp->inp_sp->sp_out; 1087 break; 1088 default: 1089 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1090 xpl->sadb_x_policy_dir)); 1091 return EINVAL; 1092 } 1093 1094 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1095} 1096 1097int 1098ipsec4_get_policy(inp, request, len, mp) 1099 struct inpcb *inp; 1100 caddr_t request; 1101 size_t len; 1102 struct mbuf **mp; 1103{ 1104 struct sadb_x_policy *xpl; 1105 struct secpolicy *pcb_sp; 1106 1107 /* sanity check. */ 1108 if (inp == NULL || request == NULL || mp == NULL) 1109 return EINVAL; 1110 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1111 if (len < sizeof(*xpl)) 1112 return EINVAL; 1113 xpl = (struct sadb_x_policy *)request; 1114 1115 /* select direction */ 1116 switch (xpl->sadb_x_policy_dir) { 1117 case IPSEC_DIR_INBOUND: 1118 pcb_sp = inp->inp_sp->sp_in; 1119 break; 1120 case IPSEC_DIR_OUTBOUND: 1121 pcb_sp = inp->inp_sp->sp_out; 1122 break; 1123 default: 1124 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1125 xpl->sadb_x_policy_dir)); 1126 return EINVAL; 1127 } 1128 1129 return ipsec_get_policy(pcb_sp, mp); 1130} 1131 1132/* delete policy in PCB */ 1133int 1134ipsec4_delete_pcbpolicy(inp) 1135 struct inpcb *inp; 1136{ 1137 IPSEC_ASSERT(inp != NULL, ("null inp")); 1138 1139 if (inp->inp_sp == NULL) 1140 return 0; 1141 1142 if (inp->inp_sp->sp_in != NULL) 1143 KEY_FREESP(&inp->inp_sp->sp_in); 1144 1145 if (inp->inp_sp->sp_out != NULL) 1146 KEY_FREESP(&inp->inp_sp->sp_out); 1147 1148 ipsec_delpcbpolicy(inp->inp_sp); 1149 inp->inp_sp = NULL; 1150 1151 return 0; 1152} 1153 1154#ifdef INET6 1155int 1156ipsec6_set_policy(in6p, optname, request, len, priv) 1157 struct in6pcb *in6p; 1158 int optname; 1159 caddr_t request; 1160 size_t len; 1161 int priv; 1162{ 1163 struct sadb_x_policy *xpl; 1164 struct secpolicy **pcb_sp; 1165 1166 /* sanity check. */ 1167 if (in6p == NULL || request == NULL) 1168 return EINVAL; 1169 if (len < sizeof(*xpl)) 1170 return EINVAL; 1171 xpl = (struct sadb_x_policy *)request; 1172 1173 /* select direction */ 1174 switch (xpl->sadb_x_policy_dir) { 1175 case IPSEC_DIR_INBOUND: 1176 pcb_sp = &in6p->in6p_sp->sp_in; 1177 break; 1178 case IPSEC_DIR_OUTBOUND: 1179 pcb_sp = &in6p->in6p_sp->sp_out; 1180 break; 1181 default: 1182 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1183 xpl->sadb_x_policy_dir)); 1184 return EINVAL; 1185 } 1186 1187 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1188} 1189 1190int 1191ipsec6_get_policy(in6p, request, len, mp) 1192 struct in6pcb *in6p; 1193 caddr_t request; 1194 size_t len; 1195 struct mbuf **mp; 1196{ 1197 struct sadb_x_policy *xpl; 1198 struct secpolicy *pcb_sp; 1199 1200 /* sanity check. */ 1201 if (in6p == NULL || request == NULL || mp == NULL) 1202 return EINVAL; 1203 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1204 if (len < sizeof(*xpl)) 1205 return EINVAL; 1206 xpl = (struct sadb_x_policy *)request; 1207 1208 /* select direction */ 1209 switch (xpl->sadb_x_policy_dir) { 1210 case IPSEC_DIR_INBOUND: 1211 pcb_sp = in6p->in6p_sp->sp_in; 1212 break; 1213 case IPSEC_DIR_OUTBOUND: 1214 pcb_sp = in6p->in6p_sp->sp_out; 1215 break; 1216 default: 1217 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1218 xpl->sadb_x_policy_dir)); 1219 return EINVAL; 1220 } 1221 1222 return ipsec_get_policy(pcb_sp, mp); 1223} 1224 1225int 1226ipsec6_delete_pcbpolicy(in6p) 1227 struct in6pcb *in6p; 1228{ 1229 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1230 1231 if (in6p->in6p_sp == NULL) 1232 return 0; 1233 1234 if (in6p->in6p_sp->sp_in != NULL) 1235 KEY_FREESP(&in6p->in6p_sp->sp_in); 1236 1237 if (in6p->in6p_sp->sp_out != NULL) 1238 KEY_FREESP(&in6p->in6p_sp->sp_out); 1239 1240 ipsec_delpcbpolicy(in6p->in6p_sp); 1241 in6p->in6p_sp = NULL; 1242 1243 return 0; 1244} 1245#endif 1246 1247/* 1248 * return current level. 1249 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1250 */ 1251u_int 1252ipsec_get_reqlevel(isr) 1253 struct ipsecrequest *isr; 1254{ 1255 u_int level = 0; 1256 u_int esp_trans_deflev, esp_net_deflev; 1257 u_int ah_trans_deflev, ah_net_deflev; 1258 1259 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1260 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1261 ("af family mismatch, src %u, dst %u", 1262 isr->sp->spidx.src.sa.sa_family, 1263 isr->sp->spidx.dst.sa.sa_family)); 1264 1265/* XXX note that we have ipseclog() expanded here - code sync issue */ 1266#define IPSEC_CHECK_DEFAULT(lev) \ 1267 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1268 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1269 ? (ipsec_debug \ 1270 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1271 (lev), IPSEC_LEVEL_REQUIRE) \ 1272 : 0), \ 1273 (lev) = IPSEC_LEVEL_REQUIRE, \ 1274 (lev) \ 1275 : (lev)) 1276 1277 /* set default level */ 1278 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1279#ifdef INET 1280 case AF_INET: 1281 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1282 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1283 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1284 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1285 break; 1286#endif 1287#ifdef INET6 1288 case AF_INET6: 1289 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1290 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1291 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1292 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1293 break; 1294#endif /* INET6 */ 1295 default: 1296 panic("%s: unknown af %u", 1297 __func__, isr->sp->spidx.src.sa.sa_family); 1298 } 1299 1300#undef IPSEC_CHECK_DEFAULT 1301 1302 /* set level */ 1303 switch (isr->level) { 1304 case IPSEC_LEVEL_DEFAULT: 1305 switch (isr->saidx.proto) { 1306 case IPPROTO_ESP: 1307 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1308 level = esp_net_deflev; 1309 else 1310 level = esp_trans_deflev; 1311 break; 1312 case IPPROTO_AH: 1313 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1314 level = ah_net_deflev; 1315 else 1316 level = ah_trans_deflev; 1317 break; 1318 case IPPROTO_IPCOMP: 1319 /* 1320 * we don't really care, as IPcomp document says that 1321 * we shouldn't compress small packets 1322 */ 1323 level = IPSEC_LEVEL_USE; 1324 break; 1325 default: 1326 panic("%s: Illegal protocol defined %u\n", __func__, 1327 isr->saidx.proto); 1328 } 1329 break; 1330 1331 case IPSEC_LEVEL_USE: 1332 case IPSEC_LEVEL_REQUIRE: 1333 level = isr->level; 1334 break; 1335 case IPSEC_LEVEL_UNIQUE: 1336 level = IPSEC_LEVEL_REQUIRE; 1337 break; 1338 1339 default: 1340 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1341 } 1342 1343 return level; 1344} 1345 1346/* 1347 * Check security policy requirements against the actual 1348 * packet contents. Return one if the packet should be 1349 * reject as "invalid"; otherwiser return zero to have the 1350 * packet treated as "valid". 1351 * 1352 * OUT: 1353 * 0: valid 1354 * 1: invalid 1355 */ 1356int 1357ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1358{ 1359 struct ipsecrequest *isr; 1360 int need_auth; 1361 1362 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1363 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1364 1365 /* check policy */ 1366 switch (sp->policy) { 1367 case IPSEC_POLICY_DISCARD: 1368 return 1; 1369 case IPSEC_POLICY_BYPASS: 1370 case IPSEC_POLICY_NONE: 1371 return 0; 1372 } 1373 1374 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1375 ("invalid policy %u", sp->policy)); 1376 1377 /* XXX should compare policy against ipsec header history */ 1378 1379 need_auth = 0; 1380 for (isr = sp->req; isr != NULL; isr = isr->next) { 1381 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1382 continue; 1383 switch (isr->saidx.proto) { 1384 case IPPROTO_ESP: 1385 if ((m->m_flags & M_DECRYPTED) == 0) { 1386 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1387 printf("%s: ESP m_flags:%x\n", __func__, 1388 m->m_flags)); 1389 return 1; 1390 } 1391 1392 if (!need_auth && 1393 isr->sav != NULL && 1394 isr->sav->tdb_authalgxform != NULL && 1395 (m->m_flags & M_AUTHIPDGM) == 0) { 1396 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1397 printf("%s: ESP/AH m_flags:%x\n", __func__, 1398 m->m_flags)); 1399 return 1; 1400 } 1401 break; 1402 case IPPROTO_AH: 1403 need_auth = 1; 1404 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1405 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1406 printf("%s: AH m_flags:%x\n", __func__, 1407 m->m_flags)); 1408 return 1; 1409 } 1410 break; 1411 case IPPROTO_IPCOMP: 1412 /* 1413 * we don't really care, as IPcomp document 1414 * says that we shouldn't compress small 1415 * packets, IPComp policy should always be 1416 * treated as being in "use" level. 1417 */ 1418 break; 1419 } 1420 } 1421 return 0; /* valid */ 1422} 1423 1424/* 1425 * Check AH/ESP integrity. 1426 * This function is called from tcp_input(), udp_input(), 1427 * and {ah,esp}4_input for tunnel mode 1428 */ 1429int 1430ipsec4_in_reject(m, inp) 1431 struct mbuf *m; 1432 struct inpcb *inp; 1433{ 1434 struct secpolicy *sp; 1435 int error; 1436 int result; 1437 1438 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1439 1440 /* get SP for this packet. 1441 * When we are called from ip_forward(), we call 1442 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1443 */ 1444 if (inp == NULL) 1445 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1446 else 1447 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1448 1449 if (sp != NULL) { 1450 result = ipsec_in_reject(sp, m); 1451 if (result) 1452 newipsecstat.ips_in_polvio++; 1453 KEY_FREESP(&sp); 1454 } else { 1455 result = 0; /* XXX should be panic ? 1456 * -> No, there may be error. */ 1457 } 1458 return result; 1459} 1460 1461#ifdef INET6 1462/* 1463 * Check AH/ESP integrity. 1464 * This function is called from tcp6_input(), udp6_input(), 1465 * and {ah,esp}6_input for tunnel mode 1466 */ 1467int 1468ipsec6_in_reject(m, inp) 1469 struct mbuf *m; 1470 struct inpcb *inp; 1471{ 1472 struct secpolicy *sp = NULL; 1473 int error; 1474 int result; 1475 1476 /* sanity check */ 1477 if (m == NULL) 1478 return 0; /* XXX should be panic ? */ 1479 1480 /* get SP for this packet. 1481 * When we are called from ip_forward(), we call 1482 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1483 */ 1484 if (inp == NULL) 1485 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1486 else 1487 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1488 1489 if (sp != NULL) { 1490 result = ipsec_in_reject(sp, m); 1491 if (result) 1492 newipsecstat.ips_in_polvio++; 1493 KEY_FREESP(&sp); 1494 } else { 1495 result = 0; 1496 } 1497 return result; 1498} 1499#endif 1500 1501/* 1502 * compute the byte size to be occupied by IPsec header. 1503 * in case it is tunneled, it includes the size of outer IP header. 1504 * NOTE: SP passed is free in this function. 1505 */ 1506static size_t 1507ipsec_hdrsiz(struct secpolicy *sp) 1508{ 1509 struct ipsecrequest *isr; 1510 size_t siz; 1511 1512 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1513 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1514 1515 switch (sp->policy) { 1516 case IPSEC_POLICY_DISCARD: 1517 case IPSEC_POLICY_BYPASS: 1518 case IPSEC_POLICY_NONE: 1519 return 0; 1520 } 1521 1522 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1523 ("invalid policy %u", sp->policy)); 1524 1525 siz = 0; 1526 for (isr = sp->req; isr != NULL; isr = isr->next) { 1527 size_t clen = 0; 1528 1529 switch (isr->saidx.proto) { 1530 case IPPROTO_ESP: 1531 clen = esp_hdrsiz(isr->sav); 1532 break; 1533 case IPPROTO_AH: 1534 clen = ah_hdrsiz(isr->sav); 1535 break; 1536 case IPPROTO_IPCOMP: 1537 clen = sizeof(struct ipcomp); 1538 break; 1539 } 1540 1541 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1542 switch (isr->saidx.dst.sa.sa_family) { 1543 case AF_INET: 1544 clen += sizeof(struct ip); 1545 break; 1546#ifdef INET6 1547 case AF_INET6: 1548 clen += sizeof(struct ip6_hdr); 1549 break; 1550#endif 1551 default: 1552 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1553 "IPsec tunnel SA\n", __func__, 1554 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1555 break; 1556 } 1557 } 1558 siz += clen; 1559 } 1560 1561 return siz; 1562} 1563 1564/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1565size_t 1566ipsec4_hdrsiz(m, dir, inp) 1567 struct mbuf *m; 1568 u_int dir; 1569 struct inpcb *inp; 1570{ 1571 struct secpolicy *sp; 1572 int error; 1573 size_t size; 1574 1575 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1576 1577 /* get SP for this packet. 1578 * When we are called from ip_forward(), we call 1579 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1580 */ 1581 if (inp == NULL) 1582 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1583 else 1584 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1585 1586 if (sp != NULL) { 1587 size = ipsec_hdrsiz(sp); 1588 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1589 printf("%s: size:%lu.\n", __func__, 1590 (unsigned long)size)); 1591 1592 KEY_FREESP(&sp); 1593 } else { 1594 size = 0; /* XXX should be panic ? */ 1595 } 1596 return size; 1597} 1598 1599#ifdef INET6 1600/* This function is called from ipsec6_hdrsize_tcp(), 1601 * and maybe from ip6_forward.() 1602 */ 1603size_t 1604ipsec6_hdrsiz(m, dir, in6p) 1605 struct mbuf *m; 1606 u_int dir; 1607 struct in6pcb *in6p; 1608{ 1609 struct secpolicy *sp; 1610 int error; 1611 size_t size; 1612 1613 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1614 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1615 ("socket w/o inpcb")); 1616 1617 /* get SP for this packet */ 1618 /* XXX Is it right to call with IP_FORWARDING. */ 1619 if (in6p == NULL) 1620 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1621 else 1622 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1623 1624 if (sp == NULL) 1625 return 0; 1626 size = ipsec_hdrsiz(sp); 1627 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1628 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1629 KEY_FREESP(&sp); 1630 1631 return size; 1632} 1633#endif /*INET6*/ 1634 1635/* 1636 * Check the variable replay window. 1637 * ipsec_chkreplay() performs replay check before ICV verification. 1638 * ipsec_updatereplay() updates replay bitmap. This must be called after 1639 * ICV verification (it also performs replay check, which is usually done 1640 * beforehand). 1641 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1642 * 1643 * based on RFC 2401. 1644 */ 1645int 1646ipsec_chkreplay(seq, sav) 1647 u_int32_t seq; 1648 struct secasvar *sav; 1649{ 1650 const struct secreplay *replay; 1651 u_int32_t diff; 1652 int fr; 1653 u_int32_t wsizeb; /* constant: bits of window size */ 1654 int frlast; /* constant: last frame */ 1655 1656 IPSEC_SPLASSERT_SOFTNET(__func__); 1657 1658 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1659 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1660 1661 replay = sav->replay; 1662 1663 if (replay->wsize == 0) 1664 return 1; /* no need to check replay. */ 1665 1666 /* constant */ 1667 frlast = replay->wsize - 1; 1668 wsizeb = replay->wsize << 3; 1669 1670 /* sequence number of 0 is invalid */ 1671 if (seq == 0) 1672 return 0; 1673 1674 /* first time is always okay */ 1675 if (replay->count == 0) 1676 return 1; 1677 1678 if (seq > replay->lastseq) { 1679 /* larger sequences are okay */ 1680 return 1; 1681 } else { 1682 /* seq is equal or less than lastseq. */ 1683 diff = replay->lastseq - seq; 1684 1685 /* over range to check, i.e. too old or wrapped */ 1686 if (diff >= wsizeb) 1687 return 0; 1688 1689 fr = frlast - diff / 8; 1690 1691 /* this packet already seen ? */ 1692 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1693 return 0; 1694 1695 /* out of order but good */ 1696 return 1; 1697 } 1698} 1699 1700/* 1701 * check replay counter whether to update or not. 1702 * OUT: 0: OK 1703 * 1: NG 1704 */ 1705int 1706ipsec_updatereplay(seq, sav) 1707 u_int32_t seq; 1708 struct secasvar *sav; 1709{ 1710 struct secreplay *replay; 1711 u_int32_t diff; 1712 int fr; 1713 u_int32_t wsizeb; /* constant: bits of window size */ 1714 int frlast; /* constant: last frame */ 1715 1716 IPSEC_SPLASSERT_SOFTNET(__func__); 1717 1718 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1719 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1720 1721 replay = sav->replay; 1722 1723 if (replay->wsize == 0) 1724 goto ok; /* no need to check replay. */ 1725 1726 /* constant */ 1727 frlast = replay->wsize - 1; 1728 wsizeb = replay->wsize << 3; 1729 1730 /* sequence number of 0 is invalid */ 1731 if (seq == 0) 1732 return 1; 1733 1734 /* first time */ 1735 if (replay->count == 0) { 1736 replay->lastseq = seq; 1737 bzero(replay->bitmap, replay->wsize); 1738 (replay->bitmap)[frlast] = 1; 1739 goto ok; 1740 } 1741 1742 if (seq > replay->lastseq) { 1743 /* seq is larger than lastseq. */ 1744 diff = seq - replay->lastseq; 1745 1746 /* new larger sequence number */ 1747 if (diff < wsizeb) { 1748 /* In window */ 1749 /* set bit for this packet */ 1750 vshiftl(replay->bitmap, diff, replay->wsize); 1751 (replay->bitmap)[frlast] |= 1; 1752 } else { 1753 /* this packet has a "way larger" */ 1754 bzero(replay->bitmap, replay->wsize); 1755 (replay->bitmap)[frlast] = 1; 1756 } 1757 replay->lastseq = seq; 1758 1759 /* larger is good */ 1760 } else { 1761 /* seq is equal or less than lastseq. */ 1762 diff = replay->lastseq - seq; 1763 1764 /* over range to check, i.e. too old or wrapped */ 1765 if (diff >= wsizeb) 1766 return 1; 1767 1768 fr = frlast - diff / 8; 1769 1770 /* this packet already seen ? */ 1771 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1772 return 1; 1773 1774 /* mark as seen */ 1775 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1776 1777 /* out of order but good */ 1778 } 1779 1780ok: 1781 if (replay->count == ~0) { 1782 1783 /* set overflow flag */ 1784 replay->overflow++; 1785 1786 /* don't increment, no more packets accepted */ 1787 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1788 return 1; 1789 1790 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1791 __func__, replay->overflow, ipsec_logsastr(sav))); 1792 } 1793 1794 replay->count++; 1795 1796 return 0; 1797} 1798 1799/* 1800 * shift variable length buffer to left. 1801 * IN: bitmap: pointer to the buffer 1802 * nbit: the number of to shift. 1803 * wsize: buffer size (bytes). 1804 */ 1805static void 1806vshiftl(bitmap, nbit, wsize) 1807 unsigned char *bitmap; 1808 int nbit, wsize; 1809{ 1810 int s, j, i; 1811 unsigned char over; 1812 1813 for (j = 0; j < nbit; j += 8) { 1814 s = (nbit - j < 8) ? (nbit - j): 8; 1815 bitmap[0] <<= s; 1816 for (i = 1; i < wsize; i++) { 1817 over = (bitmap[i] >> (8 - s)); 1818 bitmap[i] <<= s; 1819 bitmap[i-1] |= over; 1820 } 1821 } 1822 1823 return; 1824} 1825 1826/* Return a printable string for the IPv4 address. */ 1827static char * 1828inet_ntoa4(struct in_addr ina) 1829{ 1830 static char buf[4][4 * sizeof "123" + 4]; 1831 unsigned char *ucp = (unsigned char *) &ina; 1832 static int i = 3; 1833 1834 i = (i + 1) % 4; 1835 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1836 ucp[2] & 0xff, ucp[3] & 0xff); 1837 return (buf[i]); 1838} 1839 1840/* Return a printable string for the address. */ 1841char * 1842ipsec_address(union sockaddr_union* sa) 1843{ 1844 switch (sa->sa.sa_family) { 1845#if INET 1846 case AF_INET: 1847 return inet_ntoa4(sa->sin.sin_addr); 1848#endif /* INET */ 1849 1850#if INET6 1851 case AF_INET6: 1852 return ip6_sprintf(&sa->sin6.sin6_addr); 1853#endif /* INET6 */ 1854 1855 default: 1856 return "(unknown address family)"; 1857 } 1858} 1859 1860const char * 1861ipsec_logsastr(sav) 1862 struct secasvar *sav; 1863{ 1864 static char buf[256]; 1865 char *p; 1866 struct secasindex *saidx = &sav->sah->saidx; 1867 1868 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1869 ("address family mismatch")); 1870 1871 p = buf; 1872 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1873 while (p && *p) 1874 p++; 1875 /* NB: only use ipsec_address on one address at a time */ 1876 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1877 ipsec_address(&saidx->src)); 1878 while (p && *p) 1879 p++; 1880 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1881 ipsec_address(&saidx->dst)); 1882 1883 return buf; 1884} 1885 1886void 1887ipsec_dumpmbuf(m) 1888 struct mbuf *m; 1889{ 1890 int totlen; 1891 int i; 1892 u_char *p; 1893 1894 totlen = 0; 1895 printf("---\n"); 1896 while (m) { 1897 p = mtod(m, u_char *); 1898 for (i = 0; i < m->m_len; i++) { 1899 printf("%02x ", p[i]); 1900 totlen++; 1901 if (totlen % 16 == 0) 1902 printf("\n"); 1903 } 1904 m = m->m_next; 1905 } 1906 if (totlen % 16 != 0) 1907 printf("\n"); 1908 printf("---\n"); 1909} 1910 1911static void 1912ipsec_attach(void) 1913{ 1914 SECPOLICY_LOCK_INIT(&ip4_def_policy); 1915 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1916} 1917SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL) 1918 1919 1920/* XXX this stuff doesn't belong here... */ 1921 1922static struct xformsw* xforms = NULL; 1923 1924/* 1925 * Register a transform; typically at system startup. 1926 */ 1927void 1928xform_register(struct xformsw* xsp) 1929{ 1930 xsp->xf_next = xforms; 1931 xforms = xsp; 1932} 1933 1934/* 1935 * Initialize transform support in an sav. 1936 */ 1937int 1938xform_init(struct secasvar *sav, int xftype) 1939{ 1940 struct xformsw *xsp; 1941 1942 if (sav->tdb_xform != NULL) /* previously initialized */ 1943 return 0; 1944 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1945 if (xsp->xf_type == xftype) 1946 return (*xsp->xf_init)(sav, xsp); 1947 return EINVAL; 1948} 1949