ipsec.c revision 186532
172445Sassar/* $FreeBSD: head/sys/netipsec/ipsec.c 186532 2008-12-27 23:24:59Z bz $ */ 2233294Sstas/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 372445Sassar 472445Sassar/*- 5233294Sstas * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 672445Sassar * All rights reserved. 772445Sassar * 872445Sassar * Redistribution and use in source and binary forms, with or without 9233294Sstas * modification, are permitted provided that the following conditions 1072445Sassar * are met: 1172445Sassar * 1. Redistributions of source code must retain the above copyright 12233294Sstas * notice, this list of conditions and the following disclaimer. 1372445Sassar * 2. Redistributions in binary form must reproduce the above copyright 1472445Sassar * notice, this list of conditions and the following disclaimer in the 1572445Sassar * documentation and/or other materials provided with the distribution. 16233294Sstas * 3. Neither the name of the project nor the names of its contributors 1772445Sassar * may be used to endorse or promote products derived from this software 1872445Sassar * without specific prior written permission. 1972445Sassar * 20233294Sstas * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 2172445Sassar * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2272445Sassar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2372445Sassar * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2472445Sassar * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2572445Sassar * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2672445Sassar * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2772445Sassar * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2872445Sassar * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2972445Sassar * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3072445Sassar * SUCH DAMAGE. 3172445Sassar */ 3272445Sassar 3372445Sassar/* 3472445Sassar * IPsec controller part. 3572445Sassar */ 3672445Sassar 3772445Sassar#include "opt_inet.h" 3872445Sassar#include "opt_inet6.h" 3972445Sassar#include "opt_ipsec.h" 40233294Sstas 4172445Sassar#include <sys/param.h> 4272445Sassar#include <sys/systm.h> 43178825Sdfr#include <sys/malloc.h> 4472445Sassar#include <sys/mbuf.h> 4572445Sassar#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#ifndef VIMAGE 101#ifndef VIMAGE_GLOBALS 102struct vnet_ipsec vnet_ipsec_0; 103#endif 104#endif 105 106#ifdef VIMAGE_GLOBALS 107/* NB: name changed so netstat doesn't use it. */ 108struct ipsecstat ipsec4stat; 109struct secpolicy ip4_def_policy; 110int ipsec_debug; 111int ip4_ah_offsetmask; 112int ip4_ipsec_dfbit; 113int ip4_esp_trans_deflev; 114int ip4_esp_net_deflev; 115int ip4_ah_trans_deflev; 116int ip4_ah_net_deflev; 117int ip4_ipsec_ecn; 118int ip4_esp_randpad; 119/* 120 * Crypto support requirements: 121 * 122 * 1 require hardware support 123 * -1 require software support 124 * 0 take anything 125 */ 126int crypto_support; 127#endif /* VIMAGE_GLOBALS */ 128 129SYSCTL_DECL(_net_inet_ipsec); 130 131/* net.inet.ipsec */ 132SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_POLICY, 133 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 134 "IPsec default policy."); 135SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, 136 esp_trans_deflev, CTLFLAG_RW, ip4_esp_trans_deflev, 0, 137 "Default ESP transport mode level"); 138SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, 139 esp_net_deflev, CTLFLAG_RW, ip4_esp_net_deflev, 0, 140 "Default ESP tunnel mode level."); 141SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, 142 ah_trans_deflev, CTLFLAG_RW, ip4_ah_trans_deflev, 0, 143 "AH transfer mode default level."); 144SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, 145 ah_net_deflev, CTLFLAG_RW, ip4_ah_net_deflev, 0, 146 "AH tunnel mode default level."); 147SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 148 ah_cleartos, CTLFLAG_RW, ah_cleartos, 0, 149 "If set clear type-of-service field when doing AH computation."); 150SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 151 ah_offsetmask, CTLFLAG_RW, ip4_ah_offsetmask, 0, 152 "If not set clear offset field mask when doing AH computation."); 153SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DFBIT, 154 dfbit, CTLFLAG_RW, ip4_ipsec_dfbit, 0, 155 "Do not fragment bit on encap."); 156SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_ECN, 157 ecn, CTLFLAG_RW, ip4_ipsec_ecn, 0, 158 "Explicit Congestion Notification handling."); 159SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEBUG, 160 debug, CTLFLAG_RW, ipsec_debug, 0, 161 "Enable IPsec debugging output when set."); 162SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 163 crypto_support, CTLFLAG_RW, crypto_support,0, 164 "Crypto driver selection."); 165SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 166 ipsecstats, CTLFLAG_RD, ipsec4stat, ipsecstat, 167 "IPsec IPv4 statistics."); 168 169#ifdef REGRESSION 170#ifdef VIMAGE_GLOBALS 171int ipsec_replay; 172int ipsec_integrity; 173#endif 174/* 175 * When set to 1, IPsec will send packets with the same sequence number. 176 * This allows to verify if the other side has proper replay attacks detection. 177 */ 178SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_replay, 179 CTLFLAG_RW, ipsec_replay, 0, "Emulate replay attack"); 180/* 181 * When set 1, IPsec will send packets with corrupted HMAC. 182 * This allows to verify if the other side properly detects modified packets. 183 */ 184SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_integrity, 185 CTLFLAG_RW, ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 186#endif 187 188#ifdef INET6 189#ifdef VIMAGE_GLOBALS 190struct ipsecstat ipsec6stat; 191int ip6_esp_trans_deflev; 192int ip6_esp_net_deflev; 193int ip6_ah_trans_deflev; 194int ip6_ah_net_deflev; 195int ip6_ipsec_ecn; 196#endif 197 198SYSCTL_DECL(_net_inet6_ipsec6); 199 200/* net.inet6.ipsec6 */ 201#ifdef COMPAT_KAME 202SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 203 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics."); 204#endif /* COMPAT_KAME */ 205SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 206 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 207 "IPsec default policy."); 208SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 209 esp_trans_deflev, CTLFLAG_RW, ip6_esp_trans_deflev, 0, 210 "Default ESP transport mode level."); 211SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 212 esp_net_deflev, CTLFLAG_RW, ip6_esp_net_deflev, 0, 213 "Default ESP tunnel mode level."); 214SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 215 ah_trans_deflev, CTLFLAG_RW, ip6_ah_trans_deflev, 0, 216 "AH transfer mode default level."); 217SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 218 ah_net_deflev, CTLFLAG_RW, ip6_ah_net_deflev, 0, 219 "AH tunnel mode default level."); 220SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_ECN, 221 ecn, CTLFLAG_RW, ip6_ipsec_ecn, 0, 222 "Explicit Congestion Notification handling."); 223SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEBUG, 224 debug, CTLFLAG_RW, ipsec_debug, 0, 225 "Enable IPsec debugging output when set."); 226SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_STATS, 227 ipsecstats, CTLFLAG_RD, ipsec6stat, ipsecstat, 228 "IPsec IPv6 statistics."); 229#endif /* INET6 */ 230 231static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *)); 232#ifdef INET6 233static int ipsec6_setspidx_inpcb __P((struct mbuf *, struct inpcb *)); 234#endif 235static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 236static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 237static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 238#ifdef INET6 239static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 240static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 241#endif 242static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 243static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 244static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 245 int optname, caddr_t request, size_t len, struct ucred *cred)); 246static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 247static void vshiftl __P((unsigned char *, int, int)); 248static size_t ipsec_hdrsiz __P((struct secpolicy *)); 249 250MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 251 252void 253ipsec_init(void) 254{ 255 INIT_VNET_IPSEC(curvnet); 256 257#ifdef IPSEC_DEBUG 258 V_ipsec_debug = 1; 259#else 260 V_ipsec_debug = 0; 261#endif 262 263 V_ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 264 V_ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 265 V_ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 266 V_ip4_esp_net_deflev = IPSEC_LEVEL_USE; 267 V_ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 268 V_ip4_ah_net_deflev = IPSEC_LEVEL_USE; 269 V_ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 270 V_ip4_esp_randpad = -1; 271 272 V_crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 273 274#ifdef REGRESSION 275 V_ipsec_replay = 0; 276 V_ipsec_integrity = 0; 277#endif 278 279#ifdef INET6 280 V_ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 281 V_ip6_esp_net_deflev = IPSEC_LEVEL_USE; 282 V_ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 283 V_ip6_ah_net_deflev = IPSEC_LEVEL_USE; 284 V_ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 285#endif 286} 287 288/* 289 * Return a held reference to the default SP. 290 */ 291static struct secpolicy * 292key_allocsp_default(const char* where, int tag) 293{ 294 INIT_VNET_IPSEC(curvnet); 295 struct secpolicy *sp; 296 297 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 298 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 299 300 sp = &V_ip4_def_policy; 301 if (sp->policy != IPSEC_POLICY_DISCARD && 302 sp->policy != IPSEC_POLICY_NONE) { 303 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 304 sp->policy, IPSEC_POLICY_NONE)); 305 sp->policy = IPSEC_POLICY_NONE; 306 } 307 key_addref(sp); 308 309 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 310 printf("DP key_allocsp_default returns SP:%p (%u)\n", 311 sp, sp->refcnt)); 312 return (sp); 313} 314#define KEY_ALLOCSP_DEFAULT() \ 315 key_allocsp_default(__FILE__, __LINE__) 316 317/* 318 * For OUTBOUND packet having a socket. Searching SPD for packet, 319 * and return a pointer to SP. 320 * OUT: NULL: no apropreate SP found, the following value is set to error. 321 * 0 : bypass 322 * EACCES : discard packet. 323 * ENOENT : ipsec_acquire() in progress, maybe. 324 * others : error occured. 325 * others: a pointer to SP 326 * 327 * NOTE: IPv6 mapped adddress concern is implemented here. 328 */ 329struct secpolicy * 330ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 331{ 332 struct secpolicy *sp; 333 334 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 335 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 336 ("invalid direction %u", dir)); 337 338 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 339 if (sp == NULL) /*XXX????*/ 340 sp = KEY_ALLOCSP_DEFAULT(); 341 IPSEC_ASSERT(sp != NULL, ("null SP")); 342 return (sp); 343} 344 345/* 346 * For OUTBOUND packet having a socket. Searching SPD for packet, 347 * and return a pointer to SP. 348 * OUT: NULL: no apropreate SP found, the following value is set to error. 349 * 0 : bypass 350 * EACCES : discard packet. 351 * ENOENT : ipsec_acquire() in progress, maybe. 352 * others : error occured. 353 * others: a pointer to SP 354 * 355 * NOTE: IPv6 mapped adddress concern is implemented here. 356 */ 357static struct secpolicy * 358ipsec_getpolicybysock(struct mbuf *m, u_int dir, struct inpcb *inp, int *error) 359{ 360 INIT_VNET_IPSEC(curvnet); 361 struct inpcbpolicy *pcbsp = NULL; 362 struct secpolicy *currsp = NULL; /* Policy on socket. */ 363 struct secpolicy *sp; 364 365 IPSEC_ASSERT(m != NULL, ("null mbuf")); 366 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 367 IPSEC_ASSERT(error != NULL, ("null error")); 368 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 369 ("invalid direction %u", dir)); 370 371 /* Set spidx in pcb. */ 372 if (inp->inp_vflag & INP_IPV6PROTO) { 373#ifdef INET6 374 *error = ipsec6_setspidx_inpcb(m, inp); 375 pcbsp = inp->inp_sp; 376#else 377 *error = EINVAL; /* Should not happen. */ 378#endif 379 } else { 380 *error = ipsec4_setspidx_inpcb(m, inp); 381 pcbsp = inp->inp_sp; 382 } 383 if (*error) 384 return (NULL); 385 386 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 387 switch (dir) { 388 case IPSEC_DIR_INBOUND: 389 currsp = pcbsp->sp_in; 390 break; 391 case IPSEC_DIR_OUTBOUND: 392 currsp = pcbsp->sp_out; 393 break; 394 } 395 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 396 397 if (pcbsp->priv) { /* When privilieged socket. */ 398 switch (currsp->policy) { 399 case IPSEC_POLICY_BYPASS: 400 case IPSEC_POLICY_IPSEC: 401 key_addref(currsp); 402 sp = currsp; 403 break; 404 405 case IPSEC_POLICY_ENTRUST: 406 /* Look for a policy in SPD. */ 407 sp = KEY_ALLOCSP(&currsp->spidx, dir); 408 if (sp == NULL) /* No SP found. */ 409 sp = KEY_ALLOCSP_DEFAULT(); 410 break; 411 412 default: 413 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 414 __func__, currsp->policy)); 415 *error = EINVAL; 416 return (NULL); 417 } 418 } else { /* Unpriv, SPD has policy. */ 419 sp = KEY_ALLOCSP(&currsp->spidx, dir); 420 if (sp == NULL) { /* No SP found. */ 421 switch (currsp->policy) { 422 case IPSEC_POLICY_BYPASS: 423 ipseclog((LOG_ERR, "%s: Illegal policy for " 424 "non-priviliged defined %d\n", 425 __func__, currsp->policy)); 426 *error = EINVAL; 427 return (NULL); 428 429 case IPSEC_POLICY_ENTRUST: 430 sp = KEY_ALLOCSP_DEFAULT(); 431 break; 432 433 case IPSEC_POLICY_IPSEC: 434 key_addref(currsp); 435 sp = currsp; 436 break; 437 438 default: 439 ipseclog((LOG_ERR, "%s: Invalid policy for " 440 "PCB %d\n", __func__, currsp->policy)); 441 *error = EINVAL; 442 return (NULL); 443 } 444 } 445 } 446 IPSEC_ASSERT(sp != NULL, 447 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 448 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 449 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 450 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 451 return (sp); 452} 453 454/* 455 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 456 * and return a pointer to SP. 457 * OUT: positive: a pointer to the entry for security policy leaf matched. 458 * NULL: no apropreate SP found, the following value is set to error. 459 * 0 : bypass 460 * EACCES : discard packet. 461 * ENOENT : ipsec_acquire() in progress, maybe. 462 * others : error occured. 463 */ 464struct secpolicy * 465ipsec_getpolicybyaddr(struct mbuf *m, u_int dir, int flag, int *error) 466{ 467 INIT_VNET_IPSEC(curvnet); 468 struct secpolicyindex spidx; 469 struct secpolicy *sp; 470 471 IPSEC_ASSERT(m != NULL, ("null mbuf")); 472 IPSEC_ASSERT(error != NULL, ("null error")); 473 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 474 ("invalid direction %u", dir)); 475 476 sp = NULL; 477 if (key_havesp(dir)) { 478 /* Make an index to look for a policy. */ 479 *error = ipsec_setspidx(m, &spidx, 480 (flag & IP_FORWARDING) ? 0 : 1); 481 if (*error != 0) { 482 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 483 __func__, dir, flag)); 484 return (NULL); 485 } 486 spidx.dir = dir; 487 488 sp = KEY_ALLOCSP(&spidx, dir); 489 } 490 if (sp == NULL) /* No SP found, use system default. */ 491 sp = KEY_ALLOCSP_DEFAULT(); 492 IPSEC_ASSERT(sp != NULL, ("null SP")); 493 return (sp); 494} 495 496struct secpolicy * 497ipsec4_checkpolicy(struct mbuf *m, u_int dir, u_int flag, int *error, 498 struct inpcb *inp) 499{ 500 INIT_VNET_IPSEC(curvnet); 501 struct secpolicy *sp; 502 503 *error = 0; 504 if (inp == NULL) 505 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 506 else 507 sp = ipsec_getpolicybysock(m, dir, inp, error); 508 if (sp == NULL) { 509 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 510 V_ipsec4stat.ips_out_inval++; 511 return (NULL); 512 } 513 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 514 switch (sp->policy) { 515 case IPSEC_POLICY_ENTRUST: 516 default: 517 printf("%s: invalid policy %u\n", __func__, sp->policy); 518 /* FALLTHROUGH */ 519 case IPSEC_POLICY_DISCARD: 520 V_ipsec4stat.ips_out_polvio++; 521 *error = -EINVAL; /* Packet is discarded by caller. */ 522 break; 523 case IPSEC_POLICY_BYPASS: 524 case IPSEC_POLICY_NONE: 525 KEY_FREESP(&sp); 526 sp = NULL; /* NB: force NULL result. */ 527 break; 528 case IPSEC_POLICY_IPSEC: 529 if (sp->req == NULL) /* Acquire a SA. */ 530 *error = key_spdacquire(sp); 531 break; 532 } 533 if (*error != 0) { 534 KEY_FREESP(&sp); 535 sp = NULL; 536 } 537 return (sp); 538} 539 540static int 541ipsec4_setspidx_inpcb(struct mbuf *m, struct inpcb *inp) 542{ 543 int error; 544 545 IPSEC_ASSERT(inp != NULL, ("null inp")); 546 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 547 IPSEC_ASSERT(inp->inp_sp->sp_out != NULL && inp->inp_sp->sp_in != NULL, 548 ("null sp_in || sp_out")); 549 550 error = ipsec_setspidx(m, &inp->inp_sp->sp_in->spidx, 1); 551 if (error == 0) { 552 inp->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 553 inp->inp_sp->sp_out->spidx = inp->inp_sp->sp_in->spidx; 554 inp->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 555 } else { 556 bzero(&inp->inp_sp->sp_in->spidx, 557 sizeof (inp->inp_sp->sp_in->spidx)); 558 bzero(&inp->inp_sp->sp_out->spidx, 559 sizeof (inp->inp_sp->sp_in->spidx)); 560 } 561 return (error); 562} 563 564#ifdef INET6 565static int 566ipsec6_setspidx_inpcb(struct mbuf *m, struct inpcb *inp) 567{ 568 int error; 569 570 IPSEC_ASSERT(inp != NULL, ("null inp")); 571 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 572 IPSEC_ASSERT(inp->inp_sp->sp_out != NULL && inp->inp_sp->sp_in != NULL, 573 ("null sp_in || sp_out")); 574 575 error = ipsec_setspidx(m, &inp->inp_sp->sp_in->spidx, 1); 576 if (error == 0) { 577 inp->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 578 inp->inp_sp->sp_out->spidx = inp->inp_sp->sp_in->spidx; 579 inp->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 580 } else { 581 bzero(&inp->inp_sp->sp_in->spidx, 582 sizeof(inp->inp_sp->sp_in->spidx)); 583 bzero(&inp->inp_sp->sp_out->spidx, 584 sizeof(inp->inp_sp->sp_in->spidx)); 585 } 586 587 return (error); 588} 589#endif 590 591/* 592 * Configure security policy index (src/dst/proto/sport/dport) 593 * by looking at the content of mbuf. 594 * The caller is responsible for error recovery (like clearing up spidx). 595 */ 596static int 597ipsec_setspidx(struct mbuf *m, struct secpolicyindex *spidx, int needport) 598{ 599 INIT_VNET_IPSEC(curvnet); 600 struct ip *ip = NULL; 601 struct ip ipbuf; 602 u_int v; 603 struct mbuf *n; 604 int len; 605 int error; 606 607 IPSEC_ASSERT(m != NULL, ("null mbuf")); 608 609 /* 610 * Validate m->m_pkthdr.len. We see incorrect length if we 611 * mistakenly call this function with inconsistent mbuf chain 612 * (like 4.4BSD tcp/udp processing). XXX Should we panic here? 613 */ 614 len = 0; 615 for (n = m; n; n = n->m_next) 616 len += n->m_len; 617 if (m->m_pkthdr.len != len) { 618 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 619 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 620 __func__, len, m->m_pkthdr.len)); 621 return (EINVAL); 622 } 623 624 if (m->m_pkthdr.len < sizeof(struct ip)) { 625 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 626 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 627 __func__, m->m_pkthdr.len)); 628 return (EINVAL); 629 } 630 631 if (m->m_len >= sizeof(*ip)) 632 ip = mtod(m, struct ip *); 633 else { 634 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 635 ip = &ipbuf; 636 } 637#ifdef _IP_VHL 638 v = _IP_VHL_V(ip->ip_vhl); 639#else 640 v = ip->ip_v; 641#endif 642 switch (v) { 643 case 4: 644 error = ipsec4_setspidx_ipaddr(m, spidx); 645 if (error) 646 return (error); 647 ipsec4_get_ulp(m, spidx, needport); 648 return (0); 649#ifdef INET6 650 case 6: 651 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 652 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 653 printf("%s: pkthdr len(%d) too small (v6), " 654 "ignored\n", __func__, m->m_pkthdr.len)); 655 return (EINVAL); 656 } 657 error = ipsec6_setspidx_ipaddr(m, spidx); 658 if (error) 659 return (error); 660 ipsec6_get_ulp(m, spidx, needport); 661 return (0); 662#endif 663 default: 664 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 665 printf("%s: " "unknown IP version %u, ignored.\n", 666 __func__, v)); 667 return (EINVAL); 668 } 669} 670 671static void 672ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 673{ 674 u_int8_t nxt; 675 int off; 676 677 /* Sanity check. */ 678 IPSEC_ASSERT(m != NULL, ("null mbuf")); 679 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 680 681 /* NB: ip_input() flips it into host endian. XXX Need more checking. */ 682 if (m->m_len < sizeof (struct ip)) { 683 struct ip *ip = mtod(m, struct ip *); 684 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 685 goto done; 686#ifdef _IP_VHL 687 off = _IP_VHL_HL(ip->ip_vhl) << 2; 688#else 689 off = ip->ip_hl << 2; 690#endif 691 nxt = ip->ip_p; 692 } else { 693 struct ip ih; 694 695 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 696 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 697 goto done; 698#ifdef _IP_VHL 699 off = _IP_VHL_HL(ih.ip_vhl) << 2; 700#else 701 off = ih.ip_hl << 2; 702#endif 703 nxt = ih.ip_p; 704 } 705 706 while (off < m->m_pkthdr.len) { 707 struct ip6_ext ip6e; 708 struct tcphdr th; 709 struct udphdr uh; 710 711 switch (nxt) { 712 case IPPROTO_TCP: 713 spidx->ul_proto = nxt; 714 if (!needport) 715 goto done_proto; 716 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 717 goto done; 718 m_copydata(m, off, sizeof (th), (caddr_t) &th); 719 spidx->src.sin.sin_port = th.th_sport; 720 spidx->dst.sin.sin_port = th.th_dport; 721 return; 722 case IPPROTO_UDP: 723 spidx->ul_proto = nxt; 724 if (!needport) 725 goto done_proto; 726 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 727 goto done; 728 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 729 spidx->src.sin.sin_port = uh.uh_sport; 730 spidx->dst.sin.sin_port = uh.uh_dport; 731 return; 732 case IPPROTO_AH: 733 if (off + sizeof(ip6e) > m->m_pkthdr.len) 734 goto done; 735 /* XXX Sigh, this works but is totally bogus. */ 736 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 737 off += (ip6e.ip6e_len + 2) << 2; 738 nxt = ip6e.ip6e_nxt; 739 break; 740 case IPPROTO_ICMP: 741 default: 742 /* XXX Intermediate headers??? */ 743 spidx->ul_proto = nxt; 744 goto done_proto; 745 } 746 } 747done: 748 spidx->ul_proto = IPSEC_ULPROTO_ANY; 749done_proto: 750 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 751 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 752} 753 754/* Assumes that m is sane. */ 755static int 756ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 757{ 758 static const struct sockaddr_in template = { 759 sizeof (struct sockaddr_in), 760 AF_INET, 761 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 762 }; 763 764 spidx->src.sin = template; 765 spidx->dst.sin = template; 766 767 if (m->m_len < sizeof (struct ip)) { 768 m_copydata(m, offsetof(struct ip, ip_src), 769 sizeof (struct in_addr), 770 (caddr_t) &spidx->src.sin.sin_addr); 771 m_copydata(m, offsetof(struct ip, ip_dst), 772 sizeof (struct in_addr), 773 (caddr_t) &spidx->dst.sin.sin_addr); 774 } else { 775 struct ip *ip = mtod(m, struct ip *); 776 spidx->src.sin.sin_addr = ip->ip_src; 777 spidx->dst.sin.sin_addr = ip->ip_dst; 778 } 779 780 spidx->prefs = sizeof(struct in_addr) << 3; 781 spidx->prefd = sizeof(struct in_addr) << 3; 782 783 return (0); 784} 785 786#ifdef INET6 787static void 788ipsec6_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 789{ 790 INIT_VNET_IPSEC(curvnet); 791 int off, nxt; 792 struct tcphdr th; 793 struct udphdr uh; 794 struct icmp6_hdr ih; 795 796 /* Sanity check. */ 797 if (m == NULL) 798 panic("%s: NULL pointer was passed.\n", __func__); 799 800 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 801 printf("%s:\n", __func__); kdebug_mbuf(m)); 802 803 /* Set default. */ 804 spidx->ul_proto = IPSEC_ULPROTO_ANY; 805 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 806 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 807 808 nxt = -1; 809 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 810 if (off < 0 || m->m_pkthdr.len < off) 811 return; 812 813 switch (nxt) { 814 case IPPROTO_TCP: 815 spidx->ul_proto = nxt; 816 if (!needport) 817 break; 818 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 819 break; 820 m_copydata(m, off, sizeof(th), (caddr_t)&th); 821 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 822 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 823 break; 824 case IPPROTO_UDP: 825 spidx->ul_proto = nxt; 826 if (!needport) 827 break; 828 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 829 break; 830 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 831 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 832 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 833 break; 834 case IPPROTO_ICMPV6: 835 spidx->ul_proto = nxt; 836 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 837 break; 838 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 839 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 840 htons((uint16_t)ih.icmp6_type); 841 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 842 htons((uint16_t)ih.icmp6_code); 843 break; 844 default: 845 /* XXX Intermediate headers??? */ 846 spidx->ul_proto = nxt; 847 break; 848 } 849} 850 851/* Assumes that m is sane. */ 852static int 853ipsec6_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 854{ 855 struct ip6_hdr *ip6 = NULL; 856 struct ip6_hdr ip6buf; 857 struct sockaddr_in6 *sin6; 858 859 if (m->m_len >= sizeof(*ip6)) 860 ip6 = mtod(m, struct ip6_hdr *); 861 else { 862 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 863 ip6 = &ip6buf; 864 } 865 866 sin6 = (struct sockaddr_in6 *)&spidx->src; 867 bzero(sin6, sizeof(*sin6)); 868 sin6->sin6_family = AF_INET6; 869 sin6->sin6_len = sizeof(struct sockaddr_in6); 870 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 871 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 872 sin6->sin6_addr.s6_addr16[1] = 0; 873 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 874 } 875 spidx->prefs = sizeof(struct in6_addr) << 3; 876 877 sin6 = (struct sockaddr_in6 *)&spidx->dst; 878 bzero(sin6, sizeof(*sin6)); 879 sin6->sin6_family = AF_INET6; 880 sin6->sin6_len = sizeof(struct sockaddr_in6); 881 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 882 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 883 sin6->sin6_addr.s6_addr16[1] = 0; 884 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 885 } 886 spidx->prefd = sizeof(struct in6_addr) << 3; 887 888 return (0); 889} 890#endif 891 892static void 893ipsec_delpcbpolicy(struct inpcbpolicy *p) 894{ 895 896 free(p, M_IPSEC_INPCB); 897} 898 899/* Initialize policy in PCB. */ 900int 901ipsec_init_policy(struct socket *so, struct inpcbpolicy **pcb_sp) 902{ 903 INIT_VNET_IPSEC(curvnet); 904 struct inpcbpolicy *new; 905 906 /* Sanity check. */ 907 if (so == NULL || pcb_sp == NULL) 908 panic("%s: NULL pointer was passed.\n", __func__); 909 910 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 911 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 912 if (new == NULL) { 913 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 914 return (ENOBUFS); 915 } 916 917 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 918 919 if ((new->sp_in = KEY_NEWSP()) == NULL) { 920 ipsec_delpcbpolicy(new); 921 return (ENOBUFS); 922 } 923 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 924 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 925 926 if ((new->sp_out = KEY_NEWSP()) == NULL) { 927 KEY_FREESP(&new->sp_in); 928 ipsec_delpcbpolicy(new); 929 return (ENOBUFS); 930 } 931 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 932 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 933 934 *pcb_sp = new; 935 936 return (0); 937} 938 939/* Copy old IPsec policy into new. */ 940int 941ipsec_copy_policy(struct inpcbpolicy *old, struct inpcbpolicy *new) 942{ 943 struct secpolicy *sp; 944 945 sp = ipsec_deepcopy_policy(old->sp_in); 946 if (sp) { 947 KEY_FREESP(&new->sp_in); 948 new->sp_in = sp; 949 } else 950 return (ENOBUFS); 951 952 sp = ipsec_deepcopy_policy(old->sp_out); 953 if (sp) { 954 KEY_FREESP(&new->sp_out); 955 new->sp_out = sp; 956 } else 957 return (ENOBUFS); 958 959 new->priv = old->priv; 960 961 return (0); 962} 963 964struct ipsecrequest * 965ipsec_newisr(void) 966{ 967 struct ipsecrequest *p; 968 969 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 970 if (p != NULL) 971 IPSECREQUEST_LOCK_INIT(p); 972 return (p); 973} 974 975void 976ipsec_delisr(struct ipsecrequest *p) 977{ 978 979 IPSECREQUEST_LOCK_DESTROY(p); 980 free(p, M_IPSEC_SR); 981} 982 983/* Deep-copy a policy in PCB. */ 984static struct secpolicy * 985ipsec_deepcopy_policy(struct secpolicy *src) 986{ 987 struct ipsecrequest *newchain = NULL; 988 struct ipsecrequest *p; 989 struct ipsecrequest **q; 990 struct ipsecrequest *r; 991 struct secpolicy *dst; 992 993 if (src == NULL) 994 return (NULL); 995 dst = KEY_NEWSP(); 996 if (dst == NULL) 997 return (NULL); 998 999 /* 1000 * Deep-copy IPsec request chain. This is required since struct 1001 * ipsecrequest is not reference counted. 1002 */ 1003 q = &newchain; 1004 for (p = src->req; p; p = p->next) { 1005 *q = ipsec_newisr(); 1006 if (*q == NULL) 1007 goto fail; 1008 (*q)->saidx.proto = p->saidx.proto; 1009 (*q)->saidx.mode = p->saidx.mode; 1010 (*q)->level = p->level; 1011 (*q)->saidx.reqid = p->saidx.reqid; 1012 1013 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1014 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1015 1016 (*q)->sp = dst; 1017 1018 q = &((*q)->next); 1019 } 1020 1021 dst->req = newchain; 1022 dst->state = src->state; 1023 dst->policy = src->policy; 1024 /* Do not touch the refcnt fields. */ 1025 1026 return (dst); 1027 1028fail: 1029 for (p = newchain; p; p = r) { 1030 r = p->next; 1031 ipsec_delisr(p); 1032 p = NULL; 1033 } 1034 return (NULL); 1035} 1036 1037/* Set policy and IPsec request if present. */ 1038static int 1039ipsec_set_policy(struct secpolicy **pcb_sp, int optname, caddr_t request, 1040 size_t len, struct ucred *cred) 1041{ 1042 INIT_VNET_IPSEC(curvnet); 1043 struct sadb_x_policy *xpl; 1044 struct secpolicy *newsp = NULL; 1045 int error; 1046 1047 /* Sanity check. */ 1048 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1049 return (EINVAL); 1050 if (len < sizeof(*xpl)) 1051 return (EINVAL); 1052 xpl = (struct sadb_x_policy *)request; 1053 1054 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1055 printf("%s: passed policy\n", __func__); 1056 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1057 1058 /* Check policy type. */ 1059 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1060 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1061 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1062 return (EINVAL); 1063 1064 /* Check privileged socket. */ 1065 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1066 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 1067 if (error) 1068 return (EACCES); 1069 } 1070 1071 /* Allocating new SP entry. */ 1072 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1073 return (error); 1074 1075 newsp->state = IPSEC_SPSTATE_ALIVE; 1076 1077 /* Clear old SP and set new SP. */ 1078 KEY_FREESP(pcb_sp); 1079 *pcb_sp = newsp; 1080 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1081 printf("%s: new policy\n", __func__); 1082 kdebug_secpolicy(newsp)); 1083 1084 return (0); 1085} 1086 1087static int 1088ipsec_get_policy(struct secpolicy *pcb_sp, struct mbuf **mp) 1089{ 1090 INIT_VNET_IPSEC(curvnet); 1091 1092 /* Sanity check. */ 1093 if (pcb_sp == NULL || mp == NULL) 1094 return (EINVAL); 1095 1096 *mp = key_sp2msg(pcb_sp); 1097 if (!*mp) { 1098 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1099 return (ENOBUFS); 1100 } 1101 1102 (*mp)->m_type = MT_DATA; 1103 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1104 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1105 1106 return (0); 1107} 1108 1109int 1110ipsec4_set_policy(struct inpcb *inp, int optname, caddr_t request, 1111 size_t len, struct ucred *cred) 1112{ 1113 INIT_VNET_IPSEC(curvnet); 1114 struct sadb_x_policy *xpl; 1115 struct secpolicy **pcb_sp; 1116 1117 /* Sanity check. */ 1118 if (inp == NULL || request == NULL) 1119 return (EINVAL); 1120 if (len < sizeof(*xpl)) 1121 return (EINVAL); 1122 xpl = (struct sadb_x_policy *)request; 1123 1124 /* Select direction. */ 1125 switch (xpl->sadb_x_policy_dir) { 1126 case IPSEC_DIR_INBOUND: 1127 pcb_sp = &inp->inp_sp->sp_in; 1128 break; 1129 case IPSEC_DIR_OUTBOUND: 1130 pcb_sp = &inp->inp_sp->sp_out; 1131 break; 1132 default: 1133 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1134 xpl->sadb_x_policy_dir)); 1135 return (EINVAL); 1136 } 1137 1138 return (ipsec_set_policy(pcb_sp, optname, request, len, cred)); 1139} 1140 1141int 1142ipsec4_get_policy(struct inpcb *inp, caddr_t request, size_t len, 1143 struct mbuf **mp) 1144{ 1145 INIT_VNET_IPSEC(curvnet); 1146 struct sadb_x_policy *xpl; 1147 struct secpolicy *pcb_sp; 1148 1149 /* Sanity check. */ 1150 if (inp == NULL || request == NULL || mp == NULL) 1151 return (EINVAL); 1152 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1153 if (len < sizeof(*xpl)) 1154 return (EINVAL); 1155 xpl = (struct sadb_x_policy *)request; 1156 1157 /* Select direction. */ 1158 switch (xpl->sadb_x_policy_dir) { 1159 case IPSEC_DIR_INBOUND: 1160 pcb_sp = inp->inp_sp->sp_in; 1161 break; 1162 case IPSEC_DIR_OUTBOUND: 1163 pcb_sp = inp->inp_sp->sp_out; 1164 break; 1165 default: 1166 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1167 xpl->sadb_x_policy_dir)); 1168 return (EINVAL); 1169 } 1170 1171 return (ipsec_get_policy(pcb_sp, mp)); 1172} 1173 1174/* Delete policy in PCB. */ 1175int 1176ipsec_delete_pcbpolicy(struct inpcb *inp) 1177{ 1178 IPSEC_ASSERT(inp != NULL, ("null inp")); 1179 1180 if (inp->inp_sp == NULL) 1181 return (0); 1182 1183 if (inp->inp_sp->sp_in != NULL) 1184 KEY_FREESP(&inp->inp_sp->sp_in); 1185 1186 if (inp->inp_sp->sp_out != NULL) 1187 KEY_FREESP(&inp->inp_sp->sp_out); 1188 1189 ipsec_delpcbpolicy(inp->inp_sp); 1190 inp->inp_sp = NULL; 1191 1192 return (0); 1193} 1194 1195#ifdef INET6 1196int 1197ipsec6_set_policy(struct inpcb *inp, int optname, caddr_t request, 1198 size_t len, struct ucred *cred) 1199{ 1200 INIT_VNET_IPSEC(curvnet); 1201 struct sadb_x_policy *xpl; 1202 struct secpolicy **pcb_sp; 1203 1204 /* Sanity check. */ 1205 if (inp == NULL || request == NULL) 1206 return (EINVAL); 1207 if (len < sizeof(*xpl)) 1208 return (EINVAL); 1209 xpl = (struct sadb_x_policy *)request; 1210 1211 /* Select direction. */ 1212 switch (xpl->sadb_x_policy_dir) { 1213 case IPSEC_DIR_INBOUND: 1214 pcb_sp = &inp->inp_sp->sp_in; 1215 break; 1216 case IPSEC_DIR_OUTBOUND: 1217 pcb_sp = &inp->inp_sp->sp_out; 1218 break; 1219 default: 1220 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1221 xpl->sadb_x_policy_dir)); 1222 return (EINVAL); 1223 } 1224 1225 return (ipsec_set_policy(pcb_sp, optname, request, len, cred)); 1226} 1227 1228int 1229ipsec6_get_policy(struct inpcb *inp, caddr_t request, size_t len, 1230 struct mbuf **mp) 1231{ 1232 INIT_VNET_IPSEC(curvnet); 1233 struct sadb_x_policy *xpl; 1234 struct secpolicy *pcb_sp; 1235 1236 /* Sanity check. */ 1237 if (inp == NULL || request == NULL || mp == NULL) 1238 return (EINVAL); 1239 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1240 if (len < sizeof(*xpl)) 1241 return (EINVAL); 1242 xpl = (struct sadb_x_policy *)request; 1243 1244 /* Select direction. */ 1245 switch (xpl->sadb_x_policy_dir) { 1246 case IPSEC_DIR_INBOUND: 1247 pcb_sp = inp->inp_sp->sp_in; 1248 break; 1249 case IPSEC_DIR_OUTBOUND: 1250 pcb_sp = inp->inp_sp->sp_out; 1251 break; 1252 default: 1253 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1254 xpl->sadb_x_policy_dir)); 1255 return (EINVAL); 1256 } 1257 1258 return (ipsec_get_policy(pcb_sp, mp)); 1259} 1260#endif 1261 1262/* 1263 * Return current level. 1264 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1265 */ 1266u_int 1267ipsec_get_reqlevel(struct ipsecrequest *isr) 1268{ 1269 INIT_VNET_IPSEC(curvnet); 1270 u_int level = 0; 1271 u_int esp_trans_deflev, esp_net_deflev; 1272 u_int ah_trans_deflev, ah_net_deflev; 1273 1274 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1275 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1276 ("af family mismatch, src %u, dst %u", 1277 isr->sp->spidx.src.sa.sa_family, 1278 isr->sp->spidx.dst.sa.sa_family)); 1279 1280/* XXX Note that we have ipseclog() expanded here - code sync issue. */ 1281#define IPSEC_CHECK_DEFAULT(lev) \ 1282 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1283 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1284 ? (V_ipsec_debug \ 1285 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1286 (lev), IPSEC_LEVEL_REQUIRE) \ 1287 : 0), \ 1288 (lev) = IPSEC_LEVEL_REQUIRE, \ 1289 (lev) \ 1290 : (lev)) 1291 1292 /* Set default level. */ 1293 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1294#ifdef INET 1295 case AF_INET: 1296 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev); 1297 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev); 1298 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev); 1299 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev); 1300 break; 1301#endif 1302#ifdef INET6 1303 case AF_INET6: 1304 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev); 1305 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev); 1306 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev); 1307 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev); 1308 break; 1309#endif /* INET6 */ 1310 default: 1311 panic("%s: unknown af %u", 1312 __func__, isr->sp->spidx.src.sa.sa_family); 1313 } 1314 1315#undef IPSEC_CHECK_DEFAULT 1316 1317 /* Set level. */ 1318 switch (isr->level) { 1319 case IPSEC_LEVEL_DEFAULT: 1320 switch (isr->saidx.proto) { 1321 case IPPROTO_ESP: 1322 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1323 level = esp_net_deflev; 1324 else 1325 level = esp_trans_deflev; 1326 break; 1327 case IPPROTO_AH: 1328 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1329 level = ah_net_deflev; 1330 else 1331 level = ah_trans_deflev; 1332 break; 1333 case IPPROTO_IPCOMP: 1334 /* 1335 * We don't really care, as IPcomp document says that 1336 * we shouldn't compress small packets. 1337 */ 1338 level = IPSEC_LEVEL_USE; 1339 break; 1340 default: 1341 panic("%s: Illegal protocol defined %u\n", __func__, 1342 isr->saidx.proto); 1343 } 1344 break; 1345 1346 case IPSEC_LEVEL_USE: 1347 case IPSEC_LEVEL_REQUIRE: 1348 level = isr->level; 1349 break; 1350 case IPSEC_LEVEL_UNIQUE: 1351 level = IPSEC_LEVEL_REQUIRE; 1352 break; 1353 1354 default: 1355 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1356 } 1357 1358 return (level); 1359} 1360 1361/* 1362 * Check security policy requirements against the actual 1363 * packet contents. Return one if the packet should be 1364 * reject as "invalid"; otherwiser return zero to have the 1365 * packet treated as "valid". 1366 * 1367 * OUT: 1368 * 0: valid 1369 * 1: invalid 1370 */ 1371int 1372ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1373{ 1374 INIT_VNET_IPSEC(curvnet); 1375 struct ipsecrequest *isr; 1376 int need_auth; 1377 1378 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1379 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1380 1381 /* Check policy. */ 1382 switch (sp->policy) { 1383 case IPSEC_POLICY_DISCARD: 1384 return (1); 1385 case IPSEC_POLICY_BYPASS: 1386 case IPSEC_POLICY_NONE: 1387 return (0); 1388 } 1389 1390 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1391 ("invalid policy %u", sp->policy)); 1392 1393 /* XXX Should compare policy against IPsec header history. */ 1394 1395 need_auth = 0; 1396 for (isr = sp->req; isr != NULL; isr = isr->next) { 1397 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1398 continue; 1399 switch (isr->saidx.proto) { 1400 case IPPROTO_ESP: 1401 if ((m->m_flags & M_DECRYPTED) == 0) { 1402 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1403 printf("%s: ESP m_flags:%x\n", __func__, 1404 m->m_flags)); 1405 return (1); 1406 } 1407 1408 if (!need_auth && 1409 isr->sav != NULL && 1410 isr->sav->tdb_authalgxform != NULL && 1411 (m->m_flags & M_AUTHIPDGM) == 0) { 1412 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1413 printf("%s: ESP/AH m_flags:%x\n", __func__, 1414 m->m_flags)); 1415 return (1); 1416 } 1417 break; 1418 case IPPROTO_AH: 1419 need_auth = 1; 1420 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1421 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1422 printf("%s: AH m_flags:%x\n", __func__, 1423 m->m_flags)); 1424 return (1); 1425 } 1426 break; 1427 case IPPROTO_IPCOMP: 1428 /* 1429 * We don't really care, as IPcomp document 1430 * says that we shouldn't compress small 1431 * packets. IPComp policy should always be 1432 * treated as being in "use" level. 1433 */ 1434 break; 1435 } 1436 } 1437 return (0); /* Valid. */ 1438} 1439 1440/* 1441 * Check AH/ESP integrity. 1442 * This function is called from tcp_input(), udp_input(), 1443 * and {ah,esp}4_input for tunnel mode. 1444 */ 1445int 1446ipsec4_in_reject(struct mbuf *m, struct inpcb *inp) 1447{ 1448 INIT_VNET_IPSEC(curvnet); 1449 struct secpolicy *sp; 1450 int error; 1451 int result; 1452 1453 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1454 1455 /* 1456 * Get SP for this packet. 1457 * When we are called from ip_forward(), we call 1458 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1459 */ 1460 if (inp == NULL) 1461 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1462 else 1463 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1464 1465 if (sp != NULL) { 1466 result = ipsec_in_reject(sp, m); 1467 if (result) 1468 V_ipsec4stat.ips_in_polvio++; 1469 KEY_FREESP(&sp); 1470 } else { 1471 result = 0; /* XXX Should be panic? 1472 * -> No, there may be error. */ 1473 } 1474 return (result); 1475} 1476 1477#ifdef INET6 1478/* 1479 * Check AH/ESP integrity. 1480 * This function is called from tcp6_input(), udp6_input(), 1481 * and {ah,esp}6_input for tunnel mode. 1482 */ 1483int 1484ipsec6_in_reject(struct mbuf *m, struct inpcb *inp) 1485{ 1486 INIT_VNET_IPSEC(curvnet); 1487 struct secpolicy *sp = NULL; 1488 int error; 1489 int result; 1490 1491 /* Sanity check. */ 1492 if (m == NULL) 1493 return (0); /* XXX Should be panic? */ 1494 1495 /* Get SP for this packet. 1496 * When we are called from ip_forward(), we call 1497 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1498 */ 1499 if (inp == NULL) 1500 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1501 else 1502 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1503 1504 if (sp != NULL) { 1505 result = ipsec_in_reject(sp, m); 1506 if (result) 1507 V_ipsec6stat.ips_in_polvio++; 1508 KEY_FREESP(&sp); 1509 } else { 1510 result = 0; 1511 } 1512 return (result); 1513} 1514#endif 1515 1516/* 1517 * Compute the byte size to be occupied by IPsec header. 1518 * In case it is tunnelled, it includes the size of outer IP header. 1519 * NOTE: SP passed is freed in this function. 1520 */ 1521static size_t 1522ipsec_hdrsiz(struct secpolicy *sp) 1523{ 1524 INIT_VNET_IPSEC(curvnet); 1525 struct ipsecrequest *isr; 1526 size_t size; 1527 1528 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1529 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1530 1531 switch (sp->policy) { 1532 case IPSEC_POLICY_DISCARD: 1533 case IPSEC_POLICY_BYPASS: 1534 case IPSEC_POLICY_NONE: 1535 return (0); 1536 } 1537 1538 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1539 ("invalid policy %u", sp->policy)); 1540 1541 size = 0; 1542 for (isr = sp->req; isr != NULL; isr = isr->next) { 1543 size_t clen = 0; 1544 1545 switch (isr->saidx.proto) { 1546 case IPPROTO_ESP: 1547 clen = esp_hdrsiz(isr->sav); 1548 break; 1549 case IPPROTO_AH: 1550 clen = ah_hdrsiz(isr->sav); 1551 break; 1552 case IPPROTO_IPCOMP: 1553 clen = sizeof(struct ipcomp); 1554 break; 1555 } 1556 1557 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1558 switch (isr->saidx.dst.sa.sa_family) { 1559 case AF_INET: 1560 clen += sizeof(struct ip); 1561 break; 1562#ifdef INET6 1563 case AF_INET6: 1564 clen += sizeof(struct ip6_hdr); 1565 break; 1566#endif 1567 default: 1568 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1569 "IPsec tunnel SA\n", __func__, 1570 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1571 break; 1572 } 1573 } 1574 size += clen; 1575 } 1576 1577 return (size); 1578} 1579 1580/* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1581size_t 1582ipsec4_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 1583{ 1584 INIT_VNET_IPSEC(curvnet); 1585 struct secpolicy *sp; 1586 int error; 1587 size_t size; 1588 1589 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1590 1591 /* Get SP for this packet. 1592 * When we are called from ip_forward(), we call 1593 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1594 */ 1595 if (inp == NULL) 1596 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1597 else 1598 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1599 1600 if (sp != NULL) { 1601 size = ipsec_hdrsiz(sp); 1602 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1603 printf("%s: size:%lu.\n", __func__, 1604 (unsigned long)size)); 1605 1606 KEY_FREESP(&sp); 1607 } else { 1608 size = 0; /* XXX Should be panic? 1609 * -> No, we are called w/o knowing if 1610 * IPsec processing is needed. */ 1611 } 1612 return (size); 1613} 1614 1615#ifdef INET6 1616/* This function is called from ipsec6_hdrsize_tcp(), 1617 * and maybe from ip6_forward(). 1618 */ 1619size_t 1620ipsec6_hdrsiz(struct mbuf *m, u_int dir, struct inpcb *inp) 1621{ 1622 INIT_VNET_IPSEC(curvnet); 1623 struct secpolicy *sp; 1624 int error; 1625 size_t size; 1626 1627 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1628 IPSEC_ASSERT(inp == NULL || inp->inp_socket != NULL, 1629 ("socket w/o inpcb")); 1630 1631 /* Get SP for this packet. */ 1632 /* XXX Is it right to call with IP_FORWARDING. */ 1633 if (inp == NULL) 1634 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1635 else 1636 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1637 1638 if (sp == NULL) 1639 return (0); 1640 size = ipsec_hdrsiz(sp); 1641 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1642 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1643 KEY_FREESP(&sp); 1644 1645 return (size); 1646} 1647#endif /*INET6*/ 1648 1649/* 1650 * Check the variable replay window. 1651 * ipsec_chkreplay() performs replay check before ICV verification. 1652 * ipsec_updatereplay() updates replay bitmap. This must be called after 1653 * ICV verification (it also performs replay check, which is usually done 1654 * beforehand). 1655 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1656 * 1657 * Based on RFC 2401. 1658 */ 1659int 1660ipsec_chkreplay(u_int32_t seq, struct secasvar *sav) 1661{ 1662 const struct secreplay *replay; 1663 u_int32_t diff; 1664 int fr; 1665 u_int32_t wsizeb; /* Constant: bits of window size. */ 1666 int frlast; /* Constant: last frame. */ 1667 1668 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1669 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1670 1671 replay = sav->replay; 1672 1673 if (replay->wsize == 0) 1674 return (1); /* No need to check replay. */ 1675 1676 /* Constant. */ 1677 frlast = replay->wsize - 1; 1678 wsizeb = replay->wsize << 3; 1679 1680 /* Sequence number of 0 is invalid. */ 1681 if (seq == 0) 1682 return (0); 1683 1684 /* First time is always okay. */ 1685 if (replay->count == 0) 1686 return (1); 1687 1688 if (seq > replay->lastseq) { 1689 /* Larger sequences are okay. */ 1690 return (1); 1691 } else { 1692 /* seq is equal or less than lastseq. */ 1693 diff = replay->lastseq - seq; 1694 1695 /* Over range to check, i.e. too old or wrapped. */ 1696 if (diff >= wsizeb) 1697 return (0); 1698 1699 fr = frlast - diff / 8; 1700 1701 /* This packet already seen? */ 1702 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1703 return (0); 1704 1705 /* Out of order but good. */ 1706 return (1); 1707 } 1708} 1709 1710/* 1711 * Check replay counter whether to update or not. 1712 * OUT: 0: OK 1713 * 1: NG 1714 */ 1715int 1716ipsec_updatereplay(u_int32_t seq, struct secasvar *sav) 1717{ 1718 INIT_VNET_IPSEC(curvnet); 1719 struct secreplay *replay; 1720 u_int32_t diff; 1721 int fr; 1722 u_int32_t wsizeb; /* Constant: bits of window size. */ 1723 int frlast; /* Constant: last frame. */ 1724 1725 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1726 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1727 1728 replay = sav->replay; 1729 1730 if (replay->wsize == 0) 1731 goto ok; /* No need to check replay. */ 1732 1733 /* Constant. */ 1734 frlast = replay->wsize - 1; 1735 wsizeb = replay->wsize << 3; 1736 1737 /* Sequence number of 0 is invalid. */ 1738 if (seq == 0) 1739 return (1); 1740 1741 /* First time. */ 1742 if (replay->count == 0) { 1743 replay->lastseq = seq; 1744 bzero(replay->bitmap, replay->wsize); 1745 (replay->bitmap)[frlast] = 1; 1746 goto ok; 1747 } 1748 1749 if (seq > replay->lastseq) { 1750 /* seq is larger than lastseq. */ 1751 diff = seq - replay->lastseq; 1752 1753 /* New larger sequence number. */ 1754 if (diff < wsizeb) { 1755 /* In window. */ 1756 /* Set bit for this packet. */ 1757 vshiftl(replay->bitmap, diff, replay->wsize); 1758 (replay->bitmap)[frlast] |= 1; 1759 } else { 1760 /* This packet has a "way larger". */ 1761 bzero(replay->bitmap, replay->wsize); 1762 (replay->bitmap)[frlast] = 1; 1763 } 1764 replay->lastseq = seq; 1765 1766 /* Larger is good. */ 1767 } else { 1768 /* seq is equal or less than lastseq. */ 1769 diff = replay->lastseq - seq; 1770 1771 /* Over range to check, i.e. too old or wrapped. */ 1772 if (diff >= wsizeb) 1773 return (1); 1774 1775 fr = frlast - diff / 8; 1776 1777 /* This packet already seen? */ 1778 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1779 return (1); 1780 1781 /* Mark as seen. */ 1782 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1783 1784 /* Out of order but good. */ 1785 } 1786 1787ok: 1788 if (replay->count == ~0) { 1789 1790 /* Set overflow flag. */ 1791 replay->overflow++; 1792 1793 /* Don't increment, no more packets accepted. */ 1794 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1795 return (1); 1796 1797 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1798 __func__, replay->overflow, ipsec_logsastr(sav))); 1799 } 1800 1801 replay->count++; 1802 1803 return (0); 1804} 1805 1806/* 1807 * Shift variable length buffer to left. 1808 * IN: bitmap: pointer to the buffer 1809 * nbit: the number of to shift. 1810 * wsize: buffer size (bytes). 1811 */ 1812static void 1813vshiftl(unsigned char *bitmap, int nbit, int wsize) 1814{ 1815 int s, j, i; 1816 unsigned char over; 1817 1818 for (j = 0; j < nbit; j += 8) { 1819 s = (nbit - j < 8) ? (nbit - j): 8; 1820 bitmap[0] <<= s; 1821 for (i = 1; i < wsize; i++) { 1822 over = (bitmap[i] >> (8 - s)); 1823 bitmap[i] <<= s; 1824 bitmap[i-1] |= over; 1825 } 1826 } 1827} 1828 1829/* Return a printable string for the IPv4 address. */ 1830static char * 1831inet_ntoa4(struct in_addr ina) 1832{ 1833 static char buf[4][4 * sizeof "123" + 4]; 1834 unsigned char *ucp = (unsigned char *) &ina; 1835 static int i = 3; 1836 1837 /* XXX-BZ Returns static buffer. */ 1838 i = (i + 1) % 4; 1839 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1840 ucp[2] & 0xff, ucp[3] & 0xff); 1841 return (buf[i]); 1842} 1843 1844/* Return a printable string for the address. */ 1845char * 1846ipsec_address(union sockaddr_union* sa) 1847{ 1848#ifdef INET6 1849 char ip6buf[INET6_ADDRSTRLEN]; 1850#endif 1851 1852 switch (sa->sa.sa_family) { 1853#ifdef INET 1854 case AF_INET: 1855 return (inet_ntoa4(sa->sin.sin_addr)); 1856#endif /* INET */ 1857#ifdef INET6 1858 case AF_INET6: 1859 return (ip6_sprintf(ip6buf, &sa->sin6.sin6_addr)); 1860#endif /* INET6 */ 1861 default: 1862 return ("(unknown address family)"); 1863 } 1864} 1865 1866const char * 1867ipsec_logsastr(struct secasvar *sav) 1868{ 1869 static char buf[256]; 1870 char *p; 1871 struct secasindex *saidx = &sav->sah->saidx; 1872 1873 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1874 ("address family mismatch")); 1875 1876 p = buf; 1877 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1878 while (p && *p) 1879 p++; 1880 /* NB: only use ipsec_address on one address at a time. */ 1881 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1882 ipsec_address(&saidx->src)); 1883 while (p && *p) 1884 p++; 1885 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1886 ipsec_address(&saidx->dst)); 1887 1888 return (buf); 1889} 1890 1891void 1892ipsec_dumpmbuf(struct mbuf *m) 1893{ 1894 int totlen; 1895 int i; 1896 u_char *p; 1897 1898 totlen = 0; 1899 printf("---\n"); 1900 while (m) { 1901 p = mtod(m, u_char *); 1902 for (i = 0; i < m->m_len; i++) { 1903 printf("%02x ", p[i]); 1904 totlen++; 1905 if (totlen % 16 == 0) 1906 printf("\n"); 1907 } 1908 m = m->m_next; 1909 } 1910 if (totlen % 16 != 0) 1911 printf("\n"); 1912 printf("---\n"); 1913} 1914 1915static void 1916ipsec_attach(void) 1917{ 1918 1919 SECPOLICY_LOCK_INIT(&V_ip4_def_policy); 1920 V_ip4_def_policy.refcnt = 1; /* NB: disallow free. */ 1921} 1922SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL); 1923 1924 1925/* XXX This stuff doesn't belong here... */ 1926 1927static struct xformsw* xforms = NULL; 1928 1929/* 1930 * Register a transform; typically at system startup. 1931 */ 1932void 1933xform_register(struct xformsw* xsp) 1934{ 1935 1936 xsp->xf_next = xforms; 1937 xforms = xsp; 1938} 1939 1940/* 1941 * Initialize transform support in an sav. 1942 */ 1943int 1944xform_init(struct secasvar *sav, int xftype) 1945{ 1946 struct xformsw *xsp; 1947 1948 if (sav->tdb_xform != NULL) /* Previously initialized. */ 1949 return (0); 1950 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1951 if (xsp->xf_type == xftype) 1952 return ((*xsp->xf_init)(sav, xsp)); 1953 return (EINVAL); 1954} 1955