ipsec.c revision 185292
1/* $FreeBSD: head/sys/netipsec/ipsec.c 185292 2008-11-25 09:49:05Z bz $ */ 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#include <sys/vimage.h> 57 58#include <net/if.h> 59#include <net/route.h> 60 61#include <netinet/in.h> 62#include <netinet/in_systm.h> 63#include <netinet/ip.h> 64#include <netinet/ip_var.h> 65#include <netinet/in_var.h> 66#include <netinet/udp.h> 67#include <netinet/udp_var.h> 68#include <netinet/tcp.h> 69#include <netinet/udp.h> 70 71#include <netinet/ip6.h> 72#ifdef INET6 73#include <netinet6/ip6_var.h> 74#endif 75#include <netinet/in_pcb.h> 76#ifdef INET6 77#include <netinet/icmp6.h> 78#endif 79 80#include <sys/types.h> 81#include <netipsec/ipsec.h> 82#ifdef INET6 83#include <netipsec/ipsec6.h> 84#endif 85#include <netipsec/ah_var.h> 86#include <netipsec/esp_var.h> 87#include <netipsec/ipcomp.h> /*XXX*/ 88#include <netipsec/ipcomp_var.h> 89 90#include <netipsec/key.h> 91#include <netipsec/keydb.h> 92#include <netipsec/key_debug.h> 93 94#include <netipsec/xform.h> 95 96#include <machine/in_cksum.h> 97 98#include <opencrypto/cryptodev.h> 99 100#ifdef VIMAGE_GLOBALS 101/* NB: name changed so netstat doesn't use it */ 102struct ipsecstat ipsec4stat; 103struct secpolicy ip4_def_policy; 104int ipsec_debug; 105int ip4_ah_offsetmask; 106int ip4_ipsec_dfbit; 107int ip4_esp_trans_deflev; 108int ip4_esp_net_deflev; 109int ip4_ah_trans_deflev; 110int ip4_ah_net_deflev; 111int ip4_ipsec_ecn; 112int ip4_esp_randpad; 113/* 114 * Crypto support requirements: 115 * 116 * 1 require hardware support 117 * -1 require software support 118 * 0 take anything 119 */ 120int crypto_support; 121#endif /* VIMAGE_GLOBALS */ 122 123SYSCTL_DECL(_net_inet_ipsec); 124 125/* net.inet.ipsec */ 126SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_POLICY, 127 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 128 "IPsec default policy."); 129SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, 130 esp_trans_deflev, CTLFLAG_RW, ip4_esp_trans_deflev, 0, 131 "Default ESP transport mode level"); 132SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, 133 esp_net_deflev, CTLFLAG_RW, ip4_esp_net_deflev, 0, 134 "Default ESP tunnel mode level."); 135SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, 136 ah_trans_deflev, CTLFLAG_RW, ip4_ah_trans_deflev, 0, 137 "AH transfer mode default level."); 138SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, 139 ah_net_deflev, CTLFLAG_RW, ip4_ah_net_deflev, 0, 140 "AH tunnel mode default level."); 141SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 142 ah_cleartos, CTLFLAG_RW, ah_cleartos, 0, 143 "If set clear type-of-service field when doing AH computation."); 144SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 145 ah_offsetmask, CTLFLAG_RW, ip4_ah_offsetmask, 0, 146 "If not set clear offset field mask when doing AH computation."); 147SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DFBIT, 148 dfbit, CTLFLAG_RW, ip4_ipsec_dfbit, 0, 149 "Do not fragment bit on encap."); 150SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_ECN, 151 ecn, CTLFLAG_RW, ip4_ipsec_ecn, 0, 152 "Explicit Congestion Notification handling."); 153SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEBUG, 154 debug, CTLFLAG_RW, ipsec_debug, 0, 155 "Enable IPsec debugging output when set."); 156SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 157 crypto_support, CTLFLAG_RW, crypto_support,0, 158 "Crypto driver selection."); 159SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 160 ipsecstats, CTLFLAG_RD, ipsec4stat, ipsecstat, 161 "IPsec IPv4 statistics."); 162 163#ifdef REGRESSION 164#ifdef VIMAGE_GLOBALS 165int ipsec_replay; 166int ipsec_integrity; 167#endif 168/* 169 * When set to 1, IPsec will send packets with the same sequence number. 170 * This allows to verify if the other side has proper replay attacks detection. 171 */ 172SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_replay, 173 CTLFLAG_RW, ipsec_replay, 0, "Emulate replay attack"); 174/* 175 * When set 1, IPsec will send packets with corrupted HMAC. 176 * This allows to verify if the other side properly detects modified packets. 177 */ 178SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_integrity, 179 CTLFLAG_RW, ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 180#endif 181 182#ifdef INET6 183#ifdef VIMAGE_GLOBALS 184struct ipsecstat ipsec6stat; 185int ip6_esp_trans_deflev; 186int ip6_esp_net_deflev; 187int ip6_ah_trans_deflev; 188int ip6_ah_net_deflev; 189int ip6_ipsec_ecn; 190#endif 191 192SYSCTL_DECL(_net_inet6_ipsec6); 193 194/* net.inet6.ipsec6 */ 195#ifdef COMPAT_KAME 196SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 197 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics."); 198#endif /* COMPAT_KAME */ 199SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 200 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 201 "IPsec default policy."); 202SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 203 esp_trans_deflev, CTLFLAG_RW, ip6_esp_trans_deflev, 0, 204 "Default ESP transport mode level."); 205SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 206 esp_net_deflev, CTLFLAG_RW, ip6_esp_net_deflev, 0, 207 "Default ESP tunnel mode level."); 208SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 209 ah_trans_deflev, CTLFLAG_RW, ip6_ah_trans_deflev, 0, 210 "AH transfer mode default level."); 211SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 212 ah_net_deflev, CTLFLAG_RW, ip6_ah_net_deflev, 0, 213 "AH tunnel mode default level."); 214SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_ECN, 215 ecn, CTLFLAG_RW, ip6_ipsec_ecn, 0, 216 "Explicit Congestion Notification handling."); 217SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEBUG, 218 debug, CTLFLAG_RW, ipsec_debug, 0, 219 "Enable IPsec debugging output when set."); 220SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_STATS, 221 ipsecstats, CTLFLAG_RD, ipsec6stat, ipsecstat, 222 "IPsec IPv6 statistics."); 223#endif /* INET6 */ 224 225static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 226#ifdef INET6 227static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 228#endif 229static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 230static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 231static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 232#ifdef INET6 233static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 234static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 235#endif 236static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 237static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 238static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 239 int optname, caddr_t request, size_t len, struct ucred *cred)); 240static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 241static void vshiftl __P((unsigned char *, int, int)); 242static size_t ipsec_hdrsiz __P((struct secpolicy *)); 243 244MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 245 246void 247ipsec_init(void) 248{ 249 INIT_VNET_IPSEC(curvnet); 250 251#ifdef IPSEC_DEBUG 252 V_ipsec_debug = 1; 253#else 254 V_ipsec_debug = 0; 255#endif 256 257 V_ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 258 V_ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 259 V_ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 260 V_ip4_esp_net_deflev = IPSEC_LEVEL_USE; 261 V_ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 262 V_ip4_ah_net_deflev = IPSEC_LEVEL_USE; 263 V_ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 264 V_ip4_esp_randpad = -1; 265 266 V_crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 267 268#ifdef REGRESSION 269 V_ipsec_replay = 0; 270 V_ipsec_integrity = 0; 271#endif 272 273#ifdef INET6 274 V_ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 275 V_ip6_esp_net_deflev = IPSEC_LEVEL_USE; 276 V_ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 277 V_ip6_ah_net_deflev = IPSEC_LEVEL_USE; 278 V_ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 279#endif 280} 281 282/* 283 * Return a held reference to the default SP. 284 */ 285static struct secpolicy * 286key_allocsp_default(const char* where, int tag) 287{ 288 INIT_VNET_IPSEC(curvnet); 289 struct secpolicy *sp; 290 291 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 292 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 293 294 sp = &V_ip4_def_policy; 295 if (sp->policy != IPSEC_POLICY_DISCARD && 296 sp->policy != IPSEC_POLICY_NONE) { 297 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 298 sp->policy, IPSEC_POLICY_NONE)); 299 sp->policy = IPSEC_POLICY_NONE; 300 } 301 key_addref(sp); 302 303 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 304 printf("DP key_allocsp_default returns SP:%p (%u)\n", 305 sp, sp->refcnt)); 306 return sp; 307} 308#define KEY_ALLOCSP_DEFAULT() \ 309 key_allocsp_default(__FILE__, __LINE__) 310 311/* 312 * For OUTBOUND packet having a socket. Searching SPD for packet, 313 * and return a pointer to SP. 314 * OUT: NULL: no apropreate SP found, the following value is set to error. 315 * 0 : bypass 316 * EACCES : discard packet. 317 * ENOENT : ipsec_acquire() in progress, maybe. 318 * others : error occured. 319 * others: a pointer to SP 320 * 321 * NOTE: IPv6 mapped adddress concern is implemented here. 322 */ 323struct secpolicy * 324ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 325{ 326 struct secpolicy *sp; 327 328 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 329 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 330 ("invalid direction %u", dir)); 331 332 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 333 if (sp == NULL) /*XXX????*/ 334 sp = KEY_ALLOCSP_DEFAULT(); 335 IPSEC_ASSERT(sp != NULL, ("null SP")); 336 return sp; 337} 338 339/* 340 * For OUTBOUND packet having a socket. Searching SPD for packet, 341 * and return a pointer to SP. 342 * OUT: NULL: no apropreate SP found, the following value is set to error. 343 * 0 : bypass 344 * EACCES : discard packet. 345 * ENOENT : ipsec_acquire() in progress, maybe. 346 * others : error occured. 347 * others: a pointer to SP 348 * 349 * NOTE: IPv6 mapped adddress concern is implemented here. 350 */ 351struct secpolicy * 352ipsec_getpolicybysock(m, dir, inp, error) 353 struct mbuf *m; 354 u_int dir; 355 struct inpcb *inp; 356 int *error; 357{ 358 INIT_VNET_IPSEC(curvnet); 359 struct inpcbpolicy *pcbsp = NULL; 360 struct secpolicy *currsp = NULL; /* policy on socket */ 361 struct secpolicy *sp; 362 363 IPSEC_ASSERT(m != NULL, ("null mbuf")); 364 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 365 IPSEC_ASSERT(error != NULL, ("null error")); 366 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 367 ("invalid direction %u", dir)); 368 369 /* set spidx in pcb */ 370 if (inp->inp_vflag & INP_IPV6PROTO) { 371#ifdef INET6 372 *error = ipsec6_setspidx_in6pcb(m, inp); 373 pcbsp = inp->in6p_sp; 374#else 375 *error = EINVAL; /* should not happen */ 376#endif 377 } else { 378 *error = ipsec4_setspidx_inpcb(m, inp); 379 pcbsp = inp->inp_sp; 380 } 381 if (*error) 382 return NULL; 383 384 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 385 switch (dir) { 386 case IPSEC_DIR_INBOUND: 387 currsp = pcbsp->sp_in; 388 break; 389 case IPSEC_DIR_OUTBOUND: 390 currsp = pcbsp->sp_out; 391 break; 392 } 393 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 394 395 if (pcbsp->priv) { /* when privilieged socket */ 396 switch (currsp->policy) { 397 case IPSEC_POLICY_BYPASS: 398 case IPSEC_POLICY_IPSEC: 399 key_addref(currsp); 400 sp = currsp; 401 break; 402 403 case IPSEC_POLICY_ENTRUST: 404 /* look for a policy in SPD */ 405 sp = KEY_ALLOCSP(&currsp->spidx, dir); 406 if (sp == NULL) /* no SP found */ 407 sp = KEY_ALLOCSP_DEFAULT(); 408 break; 409 410 default: 411 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 412 __func__, currsp->policy)); 413 *error = EINVAL; 414 return NULL; 415 } 416 } else { /* unpriv, SPD has policy */ 417 sp = KEY_ALLOCSP(&currsp->spidx, dir); 418 if (sp == NULL) { /* no SP found */ 419 switch (currsp->policy) { 420 case IPSEC_POLICY_BYPASS: 421 ipseclog((LOG_ERR, "%s: Illegal policy for " 422 "non-priviliged defined %d\n", 423 __func__, currsp->policy)); 424 *error = EINVAL; 425 return NULL; 426 427 case IPSEC_POLICY_ENTRUST: 428 sp = KEY_ALLOCSP_DEFAULT(); 429 break; 430 431 case IPSEC_POLICY_IPSEC: 432 key_addref(currsp); 433 sp = currsp; 434 break; 435 436 default: 437 ipseclog((LOG_ERR, "%s: Invalid policy for " 438 "PCB %d\n", __func__, currsp->policy)); 439 *error = EINVAL; 440 return NULL; 441 } 442 } 443 } 444 IPSEC_ASSERT(sp != NULL, 445 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 446 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 447 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 448 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 449 return sp; 450} 451 452/* 453 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 454 * and return a pointer to SP. 455 * OUT: positive: a pointer to the entry for security policy leaf matched. 456 * NULL: no apropreate SP found, the following value is set to error. 457 * 0 : bypass 458 * EACCES : discard packet. 459 * ENOENT : ipsec_acquire() in progress, maybe. 460 * others : error occured. 461 */ 462struct secpolicy * 463ipsec_getpolicybyaddr(m, dir, flag, error) 464 struct mbuf *m; 465 u_int dir; 466 int flag; 467 int *error; 468{ 469 INIT_VNET_IPSEC(curvnet); 470 struct secpolicyindex spidx; 471 struct secpolicy *sp; 472 473 IPSEC_ASSERT(m != NULL, ("null mbuf")); 474 IPSEC_ASSERT(error != NULL, ("null error")); 475 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 476 ("invalid direction %u", dir)); 477 478 sp = NULL; 479 if (key_havesp(dir)) { 480 /* Make an index to look for a policy. */ 481 *error = ipsec_setspidx(m, &spidx, 482 (flag & IP_FORWARDING) ? 0 : 1); 483 if (*error != 0) { 484 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 485 __func__, dir, flag)); 486 return NULL; 487 } 488 spidx.dir = dir; 489 490 sp = KEY_ALLOCSP(&spidx, dir); 491 } 492 if (sp == NULL) /* no SP found, use system default */ 493 sp = KEY_ALLOCSP_DEFAULT(); 494 IPSEC_ASSERT(sp != NULL, ("null SP")); 495 return sp; 496} 497 498struct secpolicy * 499ipsec4_checkpolicy(m, dir, flag, error, inp) 500 struct mbuf *m; 501 u_int dir, flag; 502 int *error; 503 struct inpcb *inp; 504{ 505 INIT_VNET_IPSEC(curvnet); 506 struct secpolicy *sp; 507 508 *error = 0; 509 if (inp == NULL) 510 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 511 else 512 sp = ipsec_getpolicybysock(m, dir, inp, error); 513 if (sp == NULL) { 514 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 515 V_ipsec4stat.ips_out_inval++; 516 return NULL; 517 } 518 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 519 switch (sp->policy) { 520 case IPSEC_POLICY_ENTRUST: 521 default: 522 printf("%s: invalid policy %u\n", __func__, sp->policy); 523 /* fall thru... */ 524 case IPSEC_POLICY_DISCARD: 525 V_ipsec4stat.ips_out_polvio++; 526 *error = -EINVAL; /* packet is discarded by caller */ 527 break; 528 case IPSEC_POLICY_BYPASS: 529 case IPSEC_POLICY_NONE: 530 KEY_FREESP(&sp); 531 sp = NULL; /* NB: force NULL result */ 532 break; 533 case IPSEC_POLICY_IPSEC: 534 if (sp->req == NULL) /* acquire an SA */ 535 *error = key_spdacquire(sp); 536 break; 537 } 538 if (*error != 0) { 539 KEY_FREESP(&sp); 540 sp = NULL; 541 } 542 return sp; 543} 544 545static int 546ipsec4_setspidx_inpcb(m, pcb) 547 struct mbuf *m; 548 struct inpcb *pcb; 549{ 550 int error; 551 552 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 553 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 554 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 555 ("null sp_in || sp_out")); 556 557 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 558 if (error == 0) { 559 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 560 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 561 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 562 } else { 563 bzero(&pcb->inp_sp->sp_in->spidx, 564 sizeof (pcb->inp_sp->sp_in->spidx)); 565 bzero(&pcb->inp_sp->sp_out->spidx, 566 sizeof (pcb->inp_sp->sp_in->spidx)); 567 } 568 return error; 569} 570 571#ifdef INET6 572static int 573ipsec6_setspidx_in6pcb(m, pcb) 574 struct mbuf *m; 575 struct in6pcb *pcb; 576{ 577 //INIT_VNET_IPSEC(curvnet); 578 struct secpolicyindex *spidx; 579 int error; 580 581 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 582 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 583 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 584 ("null sp_in || sp_out")); 585 586 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 587 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 588 589 spidx = &pcb->in6p_sp->sp_in->spidx; 590 error = ipsec_setspidx(m, spidx, 1); 591 if (error) 592 goto bad; 593 spidx->dir = IPSEC_DIR_INBOUND; 594 595 spidx = &pcb->in6p_sp->sp_out->spidx; 596 error = ipsec_setspidx(m, spidx, 1); 597 if (error) 598 goto bad; 599 spidx->dir = IPSEC_DIR_OUTBOUND; 600 601 return 0; 602 603bad: 604 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 605 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 606 return error; 607} 608#endif 609 610/* 611 * configure security policy index (src/dst/proto/sport/dport) 612 * by looking at the content of mbuf. 613 * the caller is responsible for error recovery (like clearing up spidx). 614 */ 615static int 616ipsec_setspidx(m, spidx, needport) 617 struct mbuf *m; 618 struct secpolicyindex *spidx; 619 int needport; 620{ 621 INIT_VNET_IPSEC(curvnet); 622 struct ip *ip = NULL; 623 struct ip ipbuf; 624 u_int v; 625 struct mbuf *n; 626 int len; 627 int error; 628 629 IPSEC_ASSERT(m != NULL, ("null mbuf")); 630 631 /* 632 * validate m->m_pkthdr.len. we see incorrect length if we 633 * mistakenly call this function with inconsistent mbuf chain 634 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 635 */ 636 len = 0; 637 for (n = m; n; n = n->m_next) 638 len += n->m_len; 639 if (m->m_pkthdr.len != len) { 640 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 641 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 642 __func__, len, m->m_pkthdr.len)); 643 return EINVAL; 644 } 645 646 if (m->m_pkthdr.len < sizeof(struct ip)) { 647 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 648 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 649 __func__, m->m_pkthdr.len)); 650 return EINVAL; 651 } 652 653 if (m->m_len >= sizeof(*ip)) 654 ip = mtod(m, struct ip *); 655 else { 656 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 657 ip = &ipbuf; 658 } 659#ifdef _IP_VHL 660 v = _IP_VHL_V(ip->ip_vhl); 661#else 662 v = ip->ip_v; 663#endif 664 switch (v) { 665 case 4: 666 error = ipsec4_setspidx_ipaddr(m, spidx); 667 if (error) 668 return error; 669 ipsec4_get_ulp(m, spidx, needport); 670 return 0; 671#ifdef INET6 672 case 6: 673 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 674 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 675 printf("%s: pkthdr len(%d) too small (v6), " 676 "ignored\n", __func__, m->m_pkthdr.len)); 677 return EINVAL; 678 } 679 error = ipsec6_setspidx_ipaddr(m, spidx); 680 if (error) 681 return error; 682 ipsec6_get_ulp(m, spidx, needport); 683 return 0; 684#endif 685 default: 686 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 687 printf("%s: " "unknown IP version %u, ignored.\n", 688 __func__, v)); 689 return EINVAL; 690 } 691} 692 693static void 694ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 695{ 696 u_int8_t nxt; 697 int off; 698 699 /* sanity check */ 700 IPSEC_ASSERT(m != NULL, ("null mbuf")); 701 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 702 703 /* NB: ip_input() flips it into host endian XXX need more checking */ 704 if (m->m_len < sizeof (struct ip)) { 705 struct ip *ip = mtod(m, struct ip *); 706 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 707 goto done; 708#ifdef _IP_VHL 709 off = _IP_VHL_HL(ip->ip_vhl) << 2; 710#else 711 off = ip->ip_hl << 2; 712#endif 713 nxt = ip->ip_p; 714 } else { 715 struct ip ih; 716 717 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 718 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 719 goto done; 720#ifdef _IP_VHL 721 off = _IP_VHL_HL(ih.ip_vhl) << 2; 722#else 723 off = ih.ip_hl << 2; 724#endif 725 nxt = ih.ip_p; 726 } 727 728 while (off < m->m_pkthdr.len) { 729 struct ip6_ext ip6e; 730 struct tcphdr th; 731 struct udphdr uh; 732 733 switch (nxt) { 734 case IPPROTO_TCP: 735 spidx->ul_proto = nxt; 736 if (!needport) 737 goto done_proto; 738 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 739 goto done; 740 m_copydata(m, off, sizeof (th), (caddr_t) &th); 741 spidx->src.sin.sin_port = th.th_sport; 742 spidx->dst.sin.sin_port = th.th_dport; 743 return; 744 case IPPROTO_UDP: 745 spidx->ul_proto = nxt; 746 if (!needport) 747 goto done_proto; 748 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 749 goto done; 750 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 751 spidx->src.sin.sin_port = uh.uh_sport; 752 spidx->dst.sin.sin_port = uh.uh_dport; 753 return; 754 case IPPROTO_AH: 755 if (off + sizeof(ip6e) > m->m_pkthdr.len) 756 goto done; 757 /* XXX sigh, this works but is totally bogus */ 758 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 759 off += (ip6e.ip6e_len + 2) << 2; 760 nxt = ip6e.ip6e_nxt; 761 break; 762 case IPPROTO_ICMP: 763 default: 764 /* XXX intermediate headers??? */ 765 spidx->ul_proto = nxt; 766 goto done_proto; 767 } 768 } 769done: 770 spidx->ul_proto = IPSEC_ULPROTO_ANY; 771done_proto: 772 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 773 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 774} 775 776/* assumes that m is sane */ 777static int 778ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 779{ 780 static const struct sockaddr_in template = { 781 sizeof (struct sockaddr_in), 782 AF_INET, 783 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 784 }; 785 786 spidx->src.sin = template; 787 spidx->dst.sin = template; 788 789 if (m->m_len < sizeof (struct ip)) { 790 m_copydata(m, offsetof(struct ip, ip_src), 791 sizeof (struct in_addr), 792 (caddr_t) &spidx->src.sin.sin_addr); 793 m_copydata(m, offsetof(struct ip, ip_dst), 794 sizeof (struct in_addr), 795 (caddr_t) &spidx->dst.sin.sin_addr); 796 } else { 797 struct ip *ip = mtod(m, struct ip *); 798 spidx->src.sin.sin_addr = ip->ip_src; 799 spidx->dst.sin.sin_addr = ip->ip_dst; 800 } 801 802 spidx->prefs = sizeof(struct in_addr) << 3; 803 spidx->prefd = sizeof(struct in_addr) << 3; 804 805 return 0; 806} 807 808#ifdef INET6 809static void 810ipsec6_get_ulp(m, spidx, needport) 811 struct mbuf *m; 812 struct secpolicyindex *spidx; 813 int needport; 814{ 815 INIT_VNET_IPSEC(curvnet); 816 int off, nxt; 817 struct tcphdr th; 818 struct udphdr uh; 819 struct icmp6_hdr ih; 820 821 /* sanity check */ 822 if (m == NULL) 823 panic("%s: NULL pointer was passed.\n", __func__); 824 825 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 826 printf("%s:\n", __func__); kdebug_mbuf(m)); 827 828 /* set default */ 829 spidx->ul_proto = IPSEC_ULPROTO_ANY; 830 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 831 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 832 833 nxt = -1; 834 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 835 if (off < 0 || m->m_pkthdr.len < off) 836 return; 837 838 switch (nxt) { 839 case IPPROTO_TCP: 840 spidx->ul_proto = nxt; 841 if (!needport) 842 break; 843 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 844 break; 845 m_copydata(m, off, sizeof(th), (caddr_t)&th); 846 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 847 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 848 break; 849 case IPPROTO_UDP: 850 spidx->ul_proto = nxt; 851 if (!needport) 852 break; 853 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 854 break; 855 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 856 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 857 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 858 break; 859 case IPPROTO_ICMPV6: 860 spidx->ul_proto = nxt; 861 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 862 break; 863 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 864 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 865 htons((uint16_t)ih.icmp6_type); 866 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 867 htons((uint16_t)ih.icmp6_code); 868 break; 869 default: 870 /* XXX intermediate headers??? */ 871 spidx->ul_proto = nxt; 872 break; 873 } 874} 875 876/* assumes that m is sane */ 877static int 878ipsec6_setspidx_ipaddr(m, spidx) 879 struct mbuf *m; 880 struct secpolicyindex *spidx; 881{ 882 struct ip6_hdr *ip6 = NULL; 883 struct ip6_hdr ip6buf; 884 struct sockaddr_in6 *sin6; 885 886 if (m->m_len >= sizeof(*ip6)) 887 ip6 = mtod(m, struct ip6_hdr *); 888 else { 889 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 890 ip6 = &ip6buf; 891 } 892 893 sin6 = (struct sockaddr_in6 *)&spidx->src; 894 bzero(sin6, sizeof(*sin6)); 895 sin6->sin6_family = AF_INET6; 896 sin6->sin6_len = sizeof(struct sockaddr_in6); 897 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 898 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 899 sin6->sin6_addr.s6_addr16[1] = 0; 900 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 901 } 902 spidx->prefs = sizeof(struct in6_addr) << 3; 903 904 sin6 = (struct sockaddr_in6 *)&spidx->dst; 905 bzero(sin6, sizeof(*sin6)); 906 sin6->sin6_family = AF_INET6; 907 sin6->sin6_len = sizeof(struct sockaddr_in6); 908 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 909 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 910 sin6->sin6_addr.s6_addr16[1] = 0; 911 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 912 } 913 spidx->prefd = sizeof(struct in6_addr) << 3; 914 915 return 0; 916} 917#endif 918 919static void 920ipsec_delpcbpolicy(p) 921 struct inpcbpolicy *p; 922{ 923 free(p, M_IPSEC_INPCB); 924} 925 926/* initialize policy in PCB */ 927int 928ipsec_init_policy(so, pcb_sp) 929 struct socket *so; 930 struct inpcbpolicy **pcb_sp; 931{ 932 INIT_VNET_IPSEC(curvnet); 933 struct inpcbpolicy *new; 934 935 /* sanity check. */ 936 if (so == NULL || pcb_sp == NULL) 937 panic("%s: NULL pointer was passed.\n", __func__); 938 939 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 940 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 941 if (new == NULL) { 942 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 943 return ENOBUFS; 944 } 945 946 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 947 948 if ((new->sp_in = KEY_NEWSP()) == NULL) { 949 ipsec_delpcbpolicy(new); 950 return ENOBUFS; 951 } 952 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 953 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 954 955 if ((new->sp_out = KEY_NEWSP()) == NULL) { 956 KEY_FREESP(&new->sp_in); 957 ipsec_delpcbpolicy(new); 958 return ENOBUFS; 959 } 960 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 961 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 962 963 *pcb_sp = new; 964 965 return 0; 966} 967 968/* copy old ipsec policy into new */ 969int 970ipsec_copy_policy(old, new) 971 struct inpcbpolicy *old, *new; 972{ 973 struct secpolicy *sp; 974 975 sp = ipsec_deepcopy_policy(old->sp_in); 976 if (sp) { 977 KEY_FREESP(&new->sp_in); 978 new->sp_in = sp; 979 } else 980 return ENOBUFS; 981 982 sp = ipsec_deepcopy_policy(old->sp_out); 983 if (sp) { 984 KEY_FREESP(&new->sp_out); 985 new->sp_out = sp; 986 } else 987 return ENOBUFS; 988 989 new->priv = old->priv; 990 991 return 0; 992} 993 994struct ipsecrequest * 995ipsec_newisr(void) 996{ 997 struct ipsecrequest *p; 998 999 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 1000 if (p != NULL) 1001 IPSECREQUEST_LOCK_INIT(p); 1002 return p; 1003} 1004 1005void 1006ipsec_delisr(struct ipsecrequest *p) 1007{ 1008 IPSECREQUEST_LOCK_DESTROY(p); 1009 free(p, M_IPSEC_SR); 1010} 1011 1012/* deep-copy a policy in PCB */ 1013static struct secpolicy * 1014ipsec_deepcopy_policy(src) 1015 struct secpolicy *src; 1016{ 1017 struct ipsecrequest *newchain = NULL; 1018 struct ipsecrequest *p; 1019 struct ipsecrequest **q; 1020 struct ipsecrequest *r; 1021 struct secpolicy *dst; 1022 1023 if (src == NULL) 1024 return NULL; 1025 dst = KEY_NEWSP(); 1026 if (dst == NULL) 1027 return NULL; 1028 1029 /* 1030 * deep-copy IPsec request chain. This is required since struct 1031 * ipsecrequest is not reference counted. 1032 */ 1033 q = &newchain; 1034 for (p = src->req; p; p = p->next) { 1035 *q = ipsec_newisr(); 1036 if (*q == NULL) 1037 goto fail; 1038 (*q)->saidx.proto = p->saidx.proto; 1039 (*q)->saidx.mode = p->saidx.mode; 1040 (*q)->level = p->level; 1041 (*q)->saidx.reqid = p->saidx.reqid; 1042 1043 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1044 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1045 1046 (*q)->sp = dst; 1047 1048 q = &((*q)->next); 1049 } 1050 1051 dst->req = newchain; 1052 dst->state = src->state; 1053 dst->policy = src->policy; 1054 /* do not touch the refcnt fields */ 1055 1056 return dst; 1057 1058fail: 1059 for (p = newchain; p; p = r) { 1060 r = p->next; 1061 ipsec_delisr(p); 1062 p = NULL; 1063 } 1064 return NULL; 1065} 1066 1067/* set policy and ipsec request if present. */ 1068static int 1069ipsec_set_policy(pcb_sp, optname, request, len, cred) 1070 struct secpolicy **pcb_sp; 1071 int optname; 1072 caddr_t request; 1073 size_t len; 1074 struct ucred *cred; 1075{ 1076 INIT_VNET_IPSEC(curvnet); 1077 struct sadb_x_policy *xpl; 1078 struct secpolicy *newsp = NULL; 1079 int error; 1080 1081 /* sanity check. */ 1082 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1083 return EINVAL; 1084 if (len < sizeof(*xpl)) 1085 return EINVAL; 1086 xpl = (struct sadb_x_policy *)request; 1087 1088 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1089 printf("%s: passed policy\n", __func__); 1090 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1091 1092 /* check policy type */ 1093 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1094 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1095 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1096 return EINVAL; 1097 1098 /* check privileged socket */ 1099 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1100 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 1101 if (error) 1102 return EACCES; 1103 } 1104 1105 /* allocation new SP entry */ 1106 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1107 return error; 1108 1109 newsp->state = IPSEC_SPSTATE_ALIVE; 1110 1111 /* clear old SP and set new SP */ 1112 KEY_FREESP(pcb_sp); 1113 *pcb_sp = newsp; 1114 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1115 printf("%s: new policy\n", __func__); 1116 kdebug_secpolicy(newsp)); 1117 1118 return 0; 1119} 1120 1121static int 1122ipsec_get_policy(pcb_sp, mp) 1123 struct secpolicy *pcb_sp; 1124 struct mbuf **mp; 1125{ 1126 INIT_VNET_IPSEC(curvnet); 1127 1128 /* sanity check. */ 1129 if (pcb_sp == NULL || mp == NULL) 1130 return EINVAL; 1131 1132 *mp = key_sp2msg(pcb_sp); 1133 if (!*mp) { 1134 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1135 return ENOBUFS; 1136 } 1137 1138 (*mp)->m_type = MT_DATA; 1139 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1140 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1141 1142 return 0; 1143} 1144 1145int 1146ipsec4_set_policy(inp, optname, request, len, cred) 1147 struct inpcb *inp; 1148 int optname; 1149 caddr_t request; 1150 size_t len; 1151 struct ucred *cred; 1152{ 1153 INIT_VNET_IPSEC(curvnet); 1154 struct sadb_x_policy *xpl; 1155 struct secpolicy **pcb_sp; 1156 1157 /* sanity check. */ 1158 if (inp == NULL || request == NULL) 1159 return EINVAL; 1160 if (len < sizeof(*xpl)) 1161 return EINVAL; 1162 xpl = (struct sadb_x_policy *)request; 1163 1164 /* select direction */ 1165 switch (xpl->sadb_x_policy_dir) { 1166 case IPSEC_DIR_INBOUND: 1167 pcb_sp = &inp->inp_sp->sp_in; 1168 break; 1169 case IPSEC_DIR_OUTBOUND: 1170 pcb_sp = &inp->inp_sp->sp_out; 1171 break; 1172 default: 1173 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1174 xpl->sadb_x_policy_dir)); 1175 return EINVAL; 1176 } 1177 1178 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1179} 1180 1181int 1182ipsec4_get_policy(inp, request, len, mp) 1183 struct inpcb *inp; 1184 caddr_t request; 1185 size_t len; 1186 struct mbuf **mp; 1187{ 1188 INIT_VNET_IPSEC(curvnet); 1189 struct sadb_x_policy *xpl; 1190 struct secpolicy *pcb_sp; 1191 1192 /* sanity check. */ 1193 if (inp == NULL || request == NULL || mp == NULL) 1194 return EINVAL; 1195 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1196 if (len < sizeof(*xpl)) 1197 return EINVAL; 1198 xpl = (struct sadb_x_policy *)request; 1199 1200 /* select direction */ 1201 switch (xpl->sadb_x_policy_dir) { 1202 case IPSEC_DIR_INBOUND: 1203 pcb_sp = inp->inp_sp->sp_in; 1204 break; 1205 case IPSEC_DIR_OUTBOUND: 1206 pcb_sp = inp->inp_sp->sp_out; 1207 break; 1208 default: 1209 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1210 xpl->sadb_x_policy_dir)); 1211 return EINVAL; 1212 } 1213 1214 return ipsec_get_policy(pcb_sp, mp); 1215} 1216 1217/* delete policy in PCB */ 1218int 1219ipsec4_delete_pcbpolicy(inp) 1220 struct inpcb *inp; 1221{ 1222 IPSEC_ASSERT(inp != NULL, ("null inp")); 1223 1224 if (inp->inp_sp == NULL) 1225 return 0; 1226 1227 if (inp->inp_sp->sp_in != NULL) 1228 KEY_FREESP(&inp->inp_sp->sp_in); 1229 1230 if (inp->inp_sp->sp_out != NULL) 1231 KEY_FREESP(&inp->inp_sp->sp_out); 1232 1233 ipsec_delpcbpolicy(inp->inp_sp); 1234 inp->inp_sp = NULL; 1235 1236 return 0; 1237} 1238 1239#ifdef INET6 1240int 1241ipsec6_set_policy(in6p, optname, request, len, cred) 1242 struct in6pcb *in6p; 1243 int optname; 1244 caddr_t request; 1245 size_t len; 1246 struct ucred *cred; 1247{ 1248 INIT_VNET_IPSEC(curvnet); 1249 struct sadb_x_policy *xpl; 1250 struct secpolicy **pcb_sp; 1251 1252 /* sanity check. */ 1253 if (in6p == NULL || request == NULL) 1254 return EINVAL; 1255 if (len < sizeof(*xpl)) 1256 return EINVAL; 1257 xpl = (struct sadb_x_policy *)request; 1258 1259 /* select direction */ 1260 switch (xpl->sadb_x_policy_dir) { 1261 case IPSEC_DIR_INBOUND: 1262 pcb_sp = &in6p->in6p_sp->sp_in; 1263 break; 1264 case IPSEC_DIR_OUTBOUND: 1265 pcb_sp = &in6p->in6p_sp->sp_out; 1266 break; 1267 default: 1268 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1269 xpl->sadb_x_policy_dir)); 1270 return EINVAL; 1271 } 1272 1273 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1274} 1275 1276int 1277ipsec6_get_policy(in6p, request, len, mp) 1278 struct in6pcb *in6p; 1279 caddr_t request; 1280 size_t len; 1281 struct mbuf **mp; 1282{ 1283 INIT_VNET_IPSEC(curvnet); 1284 struct sadb_x_policy *xpl; 1285 struct secpolicy *pcb_sp; 1286 1287 /* sanity check. */ 1288 if (in6p == NULL || request == NULL || mp == NULL) 1289 return EINVAL; 1290 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1291 if (len < sizeof(*xpl)) 1292 return EINVAL; 1293 xpl = (struct sadb_x_policy *)request; 1294 1295 /* select direction */ 1296 switch (xpl->sadb_x_policy_dir) { 1297 case IPSEC_DIR_INBOUND: 1298 pcb_sp = in6p->in6p_sp->sp_in; 1299 break; 1300 case IPSEC_DIR_OUTBOUND: 1301 pcb_sp = in6p->in6p_sp->sp_out; 1302 break; 1303 default: 1304 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1305 xpl->sadb_x_policy_dir)); 1306 return EINVAL; 1307 } 1308 1309 return ipsec_get_policy(pcb_sp, mp); 1310} 1311 1312int 1313ipsec6_delete_pcbpolicy(in6p) 1314 struct in6pcb *in6p; 1315{ 1316 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1317 1318 if (in6p->in6p_sp == NULL) 1319 return 0; 1320 1321 if (in6p->in6p_sp->sp_in != NULL) 1322 KEY_FREESP(&in6p->in6p_sp->sp_in); 1323 1324 if (in6p->in6p_sp->sp_out != NULL) 1325 KEY_FREESP(&in6p->in6p_sp->sp_out); 1326 1327 ipsec_delpcbpolicy(in6p->in6p_sp); 1328 in6p->in6p_sp = NULL; 1329 1330 return 0; 1331} 1332#endif 1333 1334/* 1335 * return current level. 1336 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1337 */ 1338u_int 1339ipsec_get_reqlevel(isr) 1340 struct ipsecrequest *isr; 1341{ 1342 INIT_VNET_IPSEC(curvnet); 1343 u_int level = 0; 1344 u_int esp_trans_deflev, esp_net_deflev; 1345 u_int ah_trans_deflev, ah_net_deflev; 1346 1347 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1348 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1349 ("af family mismatch, src %u, dst %u", 1350 isr->sp->spidx.src.sa.sa_family, 1351 isr->sp->spidx.dst.sa.sa_family)); 1352 1353/* XXX note that we have ipseclog() expanded here - code sync issue */ 1354#define IPSEC_CHECK_DEFAULT(lev) \ 1355 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1356 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1357 ? (V_ipsec_debug \ 1358 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1359 (lev), IPSEC_LEVEL_REQUIRE) \ 1360 : 0), \ 1361 (lev) = IPSEC_LEVEL_REQUIRE, \ 1362 (lev) \ 1363 : (lev)) 1364 1365 /* set default level */ 1366 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1367#ifdef INET 1368 case AF_INET: 1369 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev); 1370 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev); 1371 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev); 1372 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev); 1373 break; 1374#endif 1375#ifdef INET6 1376 case AF_INET6: 1377 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev); 1378 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev); 1379 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev); 1380 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev); 1381 break; 1382#endif /* INET6 */ 1383 default: 1384 panic("%s: unknown af %u", 1385 __func__, isr->sp->spidx.src.sa.sa_family); 1386 } 1387 1388#undef IPSEC_CHECK_DEFAULT 1389 1390 /* set level */ 1391 switch (isr->level) { 1392 case IPSEC_LEVEL_DEFAULT: 1393 switch (isr->saidx.proto) { 1394 case IPPROTO_ESP: 1395 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1396 level = esp_net_deflev; 1397 else 1398 level = esp_trans_deflev; 1399 break; 1400 case IPPROTO_AH: 1401 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1402 level = ah_net_deflev; 1403 else 1404 level = ah_trans_deflev; 1405 break; 1406 case IPPROTO_IPCOMP: 1407 /* 1408 * we don't really care, as IPcomp document says that 1409 * we shouldn't compress small packets 1410 */ 1411 level = IPSEC_LEVEL_USE; 1412 break; 1413 default: 1414 panic("%s: Illegal protocol defined %u\n", __func__, 1415 isr->saidx.proto); 1416 } 1417 break; 1418 1419 case IPSEC_LEVEL_USE: 1420 case IPSEC_LEVEL_REQUIRE: 1421 level = isr->level; 1422 break; 1423 case IPSEC_LEVEL_UNIQUE: 1424 level = IPSEC_LEVEL_REQUIRE; 1425 break; 1426 1427 default: 1428 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1429 } 1430 1431 return level; 1432} 1433 1434/* 1435 * Check security policy requirements against the actual 1436 * packet contents. Return one if the packet should be 1437 * reject as "invalid"; otherwiser return zero to have the 1438 * packet treated as "valid". 1439 * 1440 * OUT: 1441 * 0: valid 1442 * 1: invalid 1443 */ 1444int 1445ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1446{ 1447 INIT_VNET_IPSEC(curvnet); 1448 struct ipsecrequest *isr; 1449 int need_auth; 1450 1451 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1452 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1453 1454 /* check policy */ 1455 switch (sp->policy) { 1456 case IPSEC_POLICY_DISCARD: 1457 return 1; 1458 case IPSEC_POLICY_BYPASS: 1459 case IPSEC_POLICY_NONE: 1460 return 0; 1461 } 1462 1463 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1464 ("invalid policy %u", sp->policy)); 1465 1466 /* XXX should compare policy against ipsec header history */ 1467 1468 need_auth = 0; 1469 for (isr = sp->req; isr != NULL; isr = isr->next) { 1470 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1471 continue; 1472 switch (isr->saidx.proto) { 1473 case IPPROTO_ESP: 1474 if ((m->m_flags & M_DECRYPTED) == 0) { 1475 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1476 printf("%s: ESP m_flags:%x\n", __func__, 1477 m->m_flags)); 1478 return 1; 1479 } 1480 1481 if (!need_auth && 1482 isr->sav != NULL && 1483 isr->sav->tdb_authalgxform != NULL && 1484 (m->m_flags & M_AUTHIPDGM) == 0) { 1485 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1486 printf("%s: ESP/AH m_flags:%x\n", __func__, 1487 m->m_flags)); 1488 return 1; 1489 } 1490 break; 1491 case IPPROTO_AH: 1492 need_auth = 1; 1493 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1494 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1495 printf("%s: AH m_flags:%x\n", __func__, 1496 m->m_flags)); 1497 return 1; 1498 } 1499 break; 1500 case IPPROTO_IPCOMP: 1501 /* 1502 * we don't really care, as IPcomp document 1503 * says that we shouldn't compress small 1504 * packets, IPComp policy should always be 1505 * treated as being in "use" level. 1506 */ 1507 break; 1508 } 1509 } 1510 return 0; /* valid */ 1511} 1512 1513/* 1514 * Check AH/ESP integrity. 1515 * This function is called from tcp_input(), udp_input(), 1516 * and {ah,esp}4_input for tunnel mode 1517 */ 1518int 1519ipsec4_in_reject(m, inp) 1520 struct mbuf *m; 1521 struct inpcb *inp; 1522{ 1523 INIT_VNET_IPSEC(curvnet); 1524 struct secpolicy *sp; 1525 int error; 1526 int result; 1527 1528 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1529 1530 /* get SP for this packet. 1531 * When we are called from ip_forward(), we call 1532 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1533 */ 1534 if (inp == NULL) 1535 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1536 else 1537 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1538 1539 if (sp != NULL) { 1540 result = ipsec_in_reject(sp, m); 1541 if (result) 1542 V_ipsec4stat.ips_in_polvio++; 1543 KEY_FREESP(&sp); 1544 } else { 1545 result = 0; /* XXX should be panic ? 1546 * -> No, there may be error. */ 1547 } 1548 return result; 1549} 1550 1551#ifdef INET6 1552/* 1553 * Check AH/ESP integrity. 1554 * This function is called from tcp6_input(), udp6_input(), 1555 * and {ah,esp}6_input for tunnel mode 1556 */ 1557int 1558ipsec6_in_reject(m, inp) 1559 struct mbuf *m; 1560 struct inpcb *inp; 1561{ 1562 INIT_VNET_IPSEC(curvnet); 1563 struct secpolicy *sp = NULL; 1564 int error; 1565 int result; 1566 1567 /* sanity check */ 1568 if (m == NULL) 1569 return 0; /* XXX should be panic ? */ 1570 1571 /* get SP for this packet. 1572 * When we are called from ip_forward(), we call 1573 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1574 */ 1575 if (inp == NULL) 1576 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1577 else 1578 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1579 1580 if (sp != NULL) { 1581 result = ipsec_in_reject(sp, m); 1582 if (result) 1583 V_ipsec6stat.ips_in_polvio++; 1584 KEY_FREESP(&sp); 1585 } else { 1586 result = 0; 1587 } 1588 return result; 1589} 1590#endif 1591 1592/* 1593 * compute the byte size to be occupied by IPsec header. 1594 * in case it is tunneled, it includes the size of outer IP header. 1595 * NOTE: SP passed is free in this function. 1596 */ 1597static size_t 1598ipsec_hdrsiz(struct secpolicy *sp) 1599{ 1600 INIT_VNET_IPSEC(curvnet); 1601 struct ipsecrequest *isr; 1602 size_t siz; 1603 1604 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1605 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1606 1607 switch (sp->policy) { 1608 case IPSEC_POLICY_DISCARD: 1609 case IPSEC_POLICY_BYPASS: 1610 case IPSEC_POLICY_NONE: 1611 return 0; 1612 } 1613 1614 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1615 ("invalid policy %u", sp->policy)); 1616 1617 siz = 0; 1618 for (isr = sp->req; isr != NULL; isr = isr->next) { 1619 size_t clen = 0; 1620 1621 switch (isr->saidx.proto) { 1622 case IPPROTO_ESP: 1623 clen = esp_hdrsiz(isr->sav); 1624 break; 1625 case IPPROTO_AH: 1626 clen = ah_hdrsiz(isr->sav); 1627 break; 1628 case IPPROTO_IPCOMP: 1629 clen = sizeof(struct ipcomp); 1630 break; 1631 } 1632 1633 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1634 switch (isr->saidx.dst.sa.sa_family) { 1635 case AF_INET: 1636 clen += sizeof(struct ip); 1637 break; 1638#ifdef INET6 1639 case AF_INET6: 1640 clen += sizeof(struct ip6_hdr); 1641 break; 1642#endif 1643 default: 1644 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1645 "IPsec tunnel SA\n", __func__, 1646 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1647 break; 1648 } 1649 } 1650 siz += clen; 1651 } 1652 1653 return siz; 1654} 1655 1656/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1657size_t 1658ipsec4_hdrsiz(m, dir, inp) 1659 struct mbuf *m; 1660 u_int dir; 1661 struct inpcb *inp; 1662{ 1663 INIT_VNET_IPSEC(curvnet); 1664 struct secpolicy *sp; 1665 int error; 1666 size_t size; 1667 1668 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1669 1670 /* get SP for this packet. 1671 * When we are called from ip_forward(), we call 1672 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1673 */ 1674 if (inp == NULL) 1675 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1676 else 1677 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1678 1679 if (sp != NULL) { 1680 size = ipsec_hdrsiz(sp); 1681 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1682 printf("%s: size:%lu.\n", __func__, 1683 (unsigned long)size)); 1684 1685 KEY_FREESP(&sp); 1686 } else { 1687 size = 0; /* XXX should be panic ? 1688 * -> No, we are called w/o knowing if 1689 * IPsec processing is needed. */ 1690 } 1691 return size; 1692} 1693 1694#ifdef INET6 1695/* This function is called from ipsec6_hdrsize_tcp(), 1696 * and maybe from ip6_forward.() 1697 */ 1698size_t 1699ipsec6_hdrsiz(m, dir, in6p) 1700 struct mbuf *m; 1701 u_int dir; 1702 struct in6pcb *in6p; 1703{ 1704 INIT_VNET_IPSEC(curvnet); 1705 struct secpolicy *sp; 1706 int error; 1707 size_t size; 1708 1709 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1710 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1711 ("socket w/o inpcb")); 1712 1713 /* get SP for this packet */ 1714 /* XXX Is it right to call with IP_FORWARDING. */ 1715 if (in6p == NULL) 1716 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1717 else 1718 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1719 1720 if (sp == NULL) 1721 return 0; 1722 size = ipsec_hdrsiz(sp); 1723 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1724 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1725 KEY_FREESP(&sp); 1726 1727 return size; 1728} 1729#endif /*INET6*/ 1730 1731/* 1732 * Check the variable replay window. 1733 * ipsec_chkreplay() performs replay check before ICV verification. 1734 * ipsec_updatereplay() updates replay bitmap. This must be called after 1735 * ICV verification (it also performs replay check, which is usually done 1736 * beforehand). 1737 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1738 * 1739 * based on RFC 2401. 1740 */ 1741int 1742ipsec_chkreplay(seq, sav) 1743 u_int32_t seq; 1744 struct secasvar *sav; 1745{ 1746 const struct secreplay *replay; 1747 u_int32_t diff; 1748 int fr; 1749 u_int32_t wsizeb; /* constant: bits of window size */ 1750 int frlast; /* constant: last frame */ 1751 1752 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1753 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1754 1755 replay = sav->replay; 1756 1757 if (replay->wsize == 0) 1758 return 1; /* no need to check replay. */ 1759 1760 /* constant */ 1761 frlast = replay->wsize - 1; 1762 wsizeb = replay->wsize << 3; 1763 1764 /* sequence number of 0 is invalid */ 1765 if (seq == 0) 1766 return 0; 1767 1768 /* first time is always okay */ 1769 if (replay->count == 0) 1770 return 1; 1771 1772 if (seq > replay->lastseq) { 1773 /* larger sequences are okay */ 1774 return 1; 1775 } else { 1776 /* seq is equal or less than lastseq. */ 1777 diff = replay->lastseq - seq; 1778 1779 /* over range to check, i.e. too old or wrapped */ 1780 if (diff >= wsizeb) 1781 return 0; 1782 1783 fr = frlast - diff / 8; 1784 1785 /* this packet already seen ? */ 1786 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1787 return 0; 1788 1789 /* out of order but good */ 1790 return 1; 1791 } 1792} 1793 1794/* 1795 * check replay counter whether to update or not. 1796 * OUT: 0: OK 1797 * 1: NG 1798 */ 1799int 1800ipsec_updatereplay(seq, sav) 1801 u_int32_t seq; 1802 struct secasvar *sav; 1803{ 1804 INIT_VNET_IPSEC(curvnet); 1805 struct secreplay *replay; 1806 u_int32_t diff; 1807 int fr; 1808 u_int32_t wsizeb; /* constant: bits of window size */ 1809 int frlast; /* constant: last frame */ 1810 1811 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1812 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1813 1814 replay = sav->replay; 1815 1816 if (replay->wsize == 0) 1817 goto ok; /* no need to check replay. */ 1818 1819 /* constant */ 1820 frlast = replay->wsize - 1; 1821 wsizeb = replay->wsize << 3; 1822 1823 /* sequence number of 0 is invalid */ 1824 if (seq == 0) 1825 return 1; 1826 1827 /* first time */ 1828 if (replay->count == 0) { 1829 replay->lastseq = seq; 1830 bzero(replay->bitmap, replay->wsize); 1831 (replay->bitmap)[frlast] = 1; 1832 goto ok; 1833 } 1834 1835 if (seq > replay->lastseq) { 1836 /* seq is larger than lastseq. */ 1837 diff = seq - replay->lastseq; 1838 1839 /* new larger sequence number */ 1840 if (diff < wsizeb) { 1841 /* In window */ 1842 /* set bit for this packet */ 1843 vshiftl(replay->bitmap, diff, replay->wsize); 1844 (replay->bitmap)[frlast] |= 1; 1845 } else { 1846 /* this packet has a "way larger" */ 1847 bzero(replay->bitmap, replay->wsize); 1848 (replay->bitmap)[frlast] = 1; 1849 } 1850 replay->lastseq = seq; 1851 1852 /* larger is good */ 1853 } else { 1854 /* seq is equal or less than lastseq. */ 1855 diff = replay->lastseq - seq; 1856 1857 /* over range to check, i.e. too old or wrapped */ 1858 if (diff >= wsizeb) 1859 return 1; 1860 1861 fr = frlast - diff / 8; 1862 1863 /* this packet already seen ? */ 1864 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1865 return 1; 1866 1867 /* mark as seen */ 1868 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1869 1870 /* out of order but good */ 1871 } 1872 1873ok: 1874 if (replay->count == ~0) { 1875 1876 /* set overflow flag */ 1877 replay->overflow++; 1878 1879 /* don't increment, no more packets accepted */ 1880 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1881 return 1; 1882 1883 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1884 __func__, replay->overflow, ipsec_logsastr(sav))); 1885 } 1886 1887 replay->count++; 1888 1889 return 0; 1890} 1891 1892/* 1893 * shift variable length buffer to left. 1894 * IN: bitmap: pointer to the buffer 1895 * nbit: the number of to shift. 1896 * wsize: buffer size (bytes). 1897 */ 1898static void 1899vshiftl(bitmap, nbit, wsize) 1900 unsigned char *bitmap; 1901 int nbit, wsize; 1902{ 1903 int s, j, i; 1904 unsigned char over; 1905 1906 for (j = 0; j < nbit; j += 8) { 1907 s = (nbit - j < 8) ? (nbit - j): 8; 1908 bitmap[0] <<= s; 1909 for (i = 1; i < wsize; i++) { 1910 over = (bitmap[i] >> (8 - s)); 1911 bitmap[i] <<= s; 1912 bitmap[i-1] |= over; 1913 } 1914 } 1915 1916 return; 1917} 1918 1919/* Return a printable string for the IPv4 address. */ 1920static char * 1921inet_ntoa4(struct in_addr ina) 1922{ 1923 static char buf[4][4 * sizeof "123" + 4]; 1924 unsigned char *ucp = (unsigned char *) &ina; 1925 static int i = 3; 1926 1927 /* XXX-BZ returns static buffer. */ 1928 i = (i + 1) % 4; 1929 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1930 ucp[2] & 0xff, ucp[3] & 0xff); 1931 return (buf[i]); 1932} 1933 1934/* Return a printable string for the address. */ 1935char * 1936ipsec_address(union sockaddr_union* sa) 1937{ 1938#ifdef INET6 1939 char ip6buf[INET6_ADDRSTRLEN]; 1940#endif 1941 switch (sa->sa.sa_family) { 1942#ifdef INET 1943 case AF_INET: 1944 return inet_ntoa4(sa->sin.sin_addr); 1945#endif /* INET */ 1946 1947#ifdef INET6 1948 case AF_INET6: 1949 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1950#endif /* INET6 */ 1951 1952 default: 1953 return "(unknown address family)"; 1954 } 1955} 1956 1957const char * 1958ipsec_logsastr(sav) 1959 struct secasvar *sav; 1960{ 1961 static char buf[256]; 1962 char *p; 1963 struct secasindex *saidx = &sav->sah->saidx; 1964 1965 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1966 ("address family mismatch")); 1967 1968 p = buf; 1969 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1970 while (p && *p) 1971 p++; 1972 /* NB: only use ipsec_address on one address at a time */ 1973 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1974 ipsec_address(&saidx->src)); 1975 while (p && *p) 1976 p++; 1977 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1978 ipsec_address(&saidx->dst)); 1979 1980 return buf; 1981} 1982 1983void 1984ipsec_dumpmbuf(m) 1985 struct mbuf *m; 1986{ 1987 int totlen; 1988 int i; 1989 u_char *p; 1990 1991 totlen = 0; 1992 printf("---\n"); 1993 while (m) { 1994 p = mtod(m, u_char *); 1995 for (i = 0; i < m->m_len; i++) { 1996 printf("%02x ", p[i]); 1997 totlen++; 1998 if (totlen % 16 == 0) 1999 printf("\n"); 2000 } 2001 m = m->m_next; 2002 } 2003 if (totlen % 16 != 0) 2004 printf("\n"); 2005 printf("---\n"); 2006} 2007 2008static void 2009ipsec_attach(void) 2010{ 2011 SECPOLICY_LOCK_INIT(&V_ip4_def_policy); 2012 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 2013} 2014SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL); 2015 2016 2017/* XXX this stuff doesn't belong here... */ 2018 2019static struct xformsw* xforms = NULL; 2020 2021/* 2022 * Register a transform; typically at system startup. 2023 */ 2024void 2025xform_register(struct xformsw* xsp) 2026{ 2027 xsp->xf_next = xforms; 2028 xforms = xsp; 2029} 2030 2031/* 2032 * Initialize transform support in an sav. 2033 */ 2034int 2035xform_init(struct secasvar *sav, int xftype) 2036{ 2037 struct xformsw *xsp; 2038 2039 if (sav->tdb_xform != NULL) /* previously initialized */ 2040 return 0; 2041 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2042 if (xsp->xf_type == xftype) 2043 return (*xsp->xf_init)(sav, xsp); 2044 return EINVAL; 2045} 2046