1 /* $FreeBSD$ */ 2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * IPsec controller part. 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/domain.h> 46 #include <sys/priv.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/socketvar.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/syslog.h> 54 #include <sys/sysctl.h> 55 #include <sys/proc.h> 56 #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 IPSEC_DEBUG 101 int ipsec_debug = 1; 102 #else 103 int ipsec_debug = 0; 104 #endif 105 106 /* NB: name changed so netstat doesn't use it */ 107 struct ipsecstat ipsec4stat; 108 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 109 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 110 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 111 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 112 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 113 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 114 struct secpolicy ip4_def_policy; 115 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 116 int ip4_esp_randpad = -1; 117 /* 118 * Crypto support requirements: 119 * 120 * 1 require hardware support 121 * -1 require software support 122 * 0 take anything 123 */ 124 int crypto_support = CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE; 125 126 SYSCTL_DECL(_net_inet_ipsec); 127 128 /* net.inet.ipsec */ 129 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_POLICY, 130 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 131 "IPsec default policy."); 132 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, 133 esp_trans_deflev, CTLFLAG_RW, ip4_esp_trans_deflev, 0, 134 "Default ESP transport mode level"); 135 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, 136 esp_net_deflev, CTLFLAG_RW, ip4_esp_net_deflev, 0, 137 "Default ESP tunnel mode level."); 138 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, 139 ah_trans_deflev, CTLFLAG_RW, ip4_ah_trans_deflev, 0, 140 "AH transfer mode default level."); 141 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, 142 ah_net_deflev, CTLFLAG_RW, ip4_ah_net_deflev, 0, 143 "AH tunnel mode default level."); 144 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 145 ah_cleartos, CTLFLAG_RW, ah_cleartos, 0, 146 "If set clear type-of-service field when doing AH computation."); 147 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 148 ah_offsetmask, CTLFLAG_RW, ip4_ah_offsetmask, 0, 149 "If not set clear offset field mask when doing AH computation."); 150 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DFBIT, 151 dfbit, CTLFLAG_RW, ip4_ipsec_dfbit, 0, 152 "Do not fragment bit on encap."); 153 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_ECN, 154 ecn, CTLFLAG_RW, ip4_ipsec_ecn, 0, 155 "Explicit Congestion Notification handling."); 156 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, IPSECCTL_DEBUG, 157 debug, CTLFLAG_RW, ipsec_debug, 0, 158 "Enable IPsec debugging output when set."); 159 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 160 crypto_support, CTLFLAG_RW, crypto_support,0, 161 "Crypto driver selection."); 162 SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet_ipsec, OID_AUTO, 163 ipsecstats, CTLFLAG_RD, ipsec4stat, ipsecstat, 164 "IPsec IPv4 statistics."); 165 166 #ifdef REGRESSION 167 /* 168 * When set to 1, IPsec will send packets with the same sequence number. 169 * This allows to verify if the other side has proper replay attacks detection. 170 */ 171 int ipsec_replay = 0; 172 SYSCTL_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 */ 178 int ipsec_integrity = 0; 179 SYSCTL_V_INT(V_NET, vnet_ipsec,_net_inet_ipsec, OID_AUTO, test_integrity, 180 CTLFLAG_RW, ipsec_integrity, 0, "Emulate man-in-the-middle attack"); 181 #endif 182 183 #ifdef INET6 184 struct ipsecstat ipsec6stat; 185 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 186 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 187 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 188 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 189 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 190 191 SYSCTL_DECL(_net_inet6_ipsec6); 192 193 /* net.inet6.ipsec6 */ 194 #ifdef COMPAT_KAME 195 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 196 0, 0, compat_ipsecstats_sysctl, "S", "IPsec IPv6 statistics."); 197 #endif /* COMPAT_KAME */ 198 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 199 def_policy, CTLFLAG_RW, ip4_def_policy.policy, 0, 200 "IPsec default policy."); 201 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, 202 esp_trans_deflev, CTLFLAG_RW, ip6_esp_trans_deflev, 0, 203 "Default ESP transport mode level."); 204 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, 205 esp_net_deflev, CTLFLAG_RW, ip6_esp_net_deflev, 0, 206 "Default ESP tunnel mode level."); 207 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, 208 ah_trans_deflev, CTLFLAG_RW, ip6_ah_trans_deflev, 0, 209 "AH transfer mode default level."); 210 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, 211 ah_net_deflev, CTLFLAG_RW, ip6_ah_net_deflev, 0, 212 "AH tunnel mode default level."); 213 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_ECN, 214 ecn, CTLFLAG_RW, ip6_ipsec_ecn, 0, 215 "Explicit Congestion Notification handling."); 216 SYSCTL_V_INT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_DEBUG, 217 debug, CTLFLAG_RW, ipsec_debug, 0, 218 "Enable IPsec debugging output when set."); 219 SYSCTL_V_STRUCT(V_NET, vnet_ipsec, _net_inet6_ipsec6, IPSECCTL_STATS, 220 ipsecstats, CTLFLAG_RD, ipsec6stat, ipsecstat, 221 "IPsec IPv6 statistics."); 222 #endif /* INET6 */ 223 224 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 225 #ifdef INET6 226 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 227 #endif 228 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 229 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 230 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 231 #ifdef INET6 232 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 233 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 234 #endif 235 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 236 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 237 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 238 int optname, caddr_t request, size_t len, struct ucred *cred)); 239 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 240 static void vshiftl __P((unsigned char *, int, int)); 241 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 242 243 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 244 245 /* 246 * Return a held reference to the default SP. 247 */ 248 static struct secpolicy * 249 key_allocsp_default(const char* where, int tag) 250 { 251 INIT_VNET_IPSEC(curvnet); 252 struct secpolicy *sp; 253 254 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 255 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 256 257 sp = &V_ip4_def_policy; 258 if (sp->policy != IPSEC_POLICY_DISCARD && 259 sp->policy != IPSEC_POLICY_NONE) { 260 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 261 sp->policy, IPSEC_POLICY_NONE)); 262 sp->policy = IPSEC_POLICY_NONE; 263 } 264 key_addref(sp); 265 266 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 267 printf("DP key_allocsp_default returns SP:%p (%u)\n", 268 sp, sp->refcnt)); 269 return sp; 270 } 271 #define KEY_ALLOCSP_DEFAULT() \ 272 key_allocsp_default(__FILE__, __LINE__) 273 274 /* 275 * For OUTBOUND packet having a socket. Searching SPD for packet, 276 * and return a pointer to SP. 277 * OUT: NULL: no apropreate SP found, the following value is set to error. 278 * 0 : bypass 279 * EACCES : discard packet. 280 * ENOENT : ipsec_acquire() in progress, maybe. 281 * others : error occured. 282 * others: a pointer to SP 283 * 284 * NOTE: IPv6 mapped adddress concern is implemented here. 285 */ 286 struct secpolicy * 287 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 288 { 289 struct secpolicy *sp; 290 291 IPSEC_ASSERT(tdbi != NULL, ("null tdbi")); 292 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 293 ("invalid direction %u", dir)); 294 295 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 296 if (sp == NULL) /*XXX????*/ 297 sp = KEY_ALLOCSP_DEFAULT(); 298 IPSEC_ASSERT(sp != NULL, ("null SP")); 299 return sp; 300 } 301 302 /* 303 * For OUTBOUND packet having a socket. Searching SPD for packet, 304 * and return a pointer to SP. 305 * OUT: NULL: no apropreate SP found, the following value is set to error. 306 * 0 : bypass 307 * EACCES : discard packet. 308 * ENOENT : ipsec_acquire() in progress, maybe. 309 * others : error occured. 310 * others: a pointer to SP 311 * 312 * NOTE: IPv6 mapped adddress concern is implemented here. 313 */ 314 struct secpolicy * 315 ipsec_getpolicybysock(m, dir, inp, error) 316 struct mbuf *m; 317 u_int dir; 318 struct inpcb *inp; 319 int *error; 320 { 321 INIT_VNET_IPSEC(curvnet); 322 struct inpcbpolicy *pcbsp = NULL; 323 struct secpolicy *currsp = NULL; /* policy on socket */ 324 struct secpolicy *sp; 325 326 IPSEC_ASSERT(m != NULL, ("null mbuf")); 327 IPSEC_ASSERT(inp != NULL, ("null inpcb")); 328 IPSEC_ASSERT(error != NULL, ("null error")); 329 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 330 ("invalid direction %u", dir)); 331 332 /* set spidx in pcb */ 333 if (inp->inp_vflag & INP_IPV6PROTO) { 334 #ifdef INET6 335 *error = ipsec6_setspidx_in6pcb(m, inp); 336 pcbsp = inp->in6p_sp; 337 #else 338 *error = EINVAL; /* should not happen */ 339 #endif 340 } else { 341 *error = ipsec4_setspidx_inpcb(m, inp); 342 pcbsp = inp->inp_sp; 343 } 344 if (*error) 345 return NULL; 346 347 IPSEC_ASSERT(pcbsp != NULL, ("null pcbsp")); 348 switch (dir) { 349 case IPSEC_DIR_INBOUND: 350 currsp = pcbsp->sp_in; 351 break; 352 case IPSEC_DIR_OUTBOUND: 353 currsp = pcbsp->sp_out; 354 break; 355 } 356 IPSEC_ASSERT(currsp != NULL, ("null currsp")); 357 358 if (pcbsp->priv) { /* when privilieged socket */ 359 switch (currsp->policy) { 360 case IPSEC_POLICY_BYPASS: 361 case IPSEC_POLICY_IPSEC: 362 key_addref(currsp); 363 sp = currsp; 364 break; 365 366 case IPSEC_POLICY_ENTRUST: 367 /* look for a policy in SPD */ 368 sp = KEY_ALLOCSP(&currsp->spidx, dir); 369 if (sp == NULL) /* no SP found */ 370 sp = KEY_ALLOCSP_DEFAULT(); 371 break; 372 373 default: 374 ipseclog((LOG_ERR, "%s: Invalid policy for PCB %d\n", 375 __func__, currsp->policy)); 376 *error = EINVAL; 377 return NULL; 378 } 379 } else { /* unpriv, SPD has policy */ 380 sp = KEY_ALLOCSP(&currsp->spidx, dir); 381 if (sp == NULL) { /* no SP found */ 382 switch (currsp->policy) { 383 case IPSEC_POLICY_BYPASS: 384 ipseclog((LOG_ERR, "%s: Illegal policy for " 385 "non-priviliged defined %d\n", 386 __func__, currsp->policy)); 387 *error = EINVAL; 388 return NULL; 389 390 case IPSEC_POLICY_ENTRUST: 391 sp = KEY_ALLOCSP_DEFAULT(); 392 break; 393 394 case IPSEC_POLICY_IPSEC: 395 key_addref(currsp); 396 sp = currsp; 397 break; 398 399 default: 400 ipseclog((LOG_ERR, "%s: Invalid policy for " 401 "PCB %d\n", __func__, currsp->policy)); 402 *error = EINVAL; 403 return NULL; 404 } 405 } 406 } 407 IPSEC_ASSERT(sp != NULL, 408 ("null SP (priv %u policy %u", pcbsp->priv, currsp->policy)); 409 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 410 printf("DP %s (priv %u policy %u) allocate SP:%p (refcnt %u)\n", 411 __func__, pcbsp->priv, currsp->policy, sp, sp->refcnt)); 412 return sp; 413 } 414 415 /* 416 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 417 * and return a pointer to SP. 418 * OUT: positive: a pointer to the entry for security policy leaf matched. 419 * NULL: no apropreate SP found, the following value is set to error. 420 * 0 : bypass 421 * EACCES : discard packet. 422 * ENOENT : ipsec_acquire() in progress, maybe. 423 * others : error occured. 424 */ 425 struct secpolicy * 426 ipsec_getpolicybyaddr(m, dir, flag, error) 427 struct mbuf *m; 428 u_int dir; 429 int flag; 430 int *error; 431 { 432 INIT_VNET_IPSEC(curvnet); 433 struct secpolicyindex spidx; 434 struct secpolicy *sp; 435 436 IPSEC_ASSERT(m != NULL, ("null mbuf")); 437 IPSEC_ASSERT(error != NULL, ("null error")); 438 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 439 ("invalid direction %u", dir)); 440 441 sp = NULL; 442 if (key_havesp(dir)) { 443 /* Make an index to look for a policy. */ 444 *error = ipsec_setspidx(m, &spidx, 445 (flag & IP_FORWARDING) ? 0 : 1); 446 if (*error != 0) { 447 DPRINTF(("%s: setpidx failed, dir %u flag %u\n", 448 __func__, dir, flag)); 449 return NULL; 450 } 451 spidx.dir = dir; 452 453 sp = KEY_ALLOCSP(&spidx, dir); 454 } 455 if (sp == NULL) /* no SP found, use system default */ 456 sp = KEY_ALLOCSP_DEFAULT(); 457 IPSEC_ASSERT(sp != NULL, ("null SP")); 458 return sp; 459 } 460 461 struct secpolicy * 462 ipsec4_checkpolicy(m, dir, flag, error, inp) 463 struct mbuf *m; 464 u_int dir, flag; 465 int *error; 466 struct inpcb *inp; 467 { 468 INIT_VNET_IPSEC(curvnet); 469 struct secpolicy *sp; 470 471 *error = 0; 472 if (inp == NULL) 473 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 474 else 475 sp = ipsec_getpolicybysock(m, dir, inp, error); 476 if (sp == NULL) { 477 IPSEC_ASSERT(*error != 0, ("getpolicy failed w/o error")); 478 V_ipsec4stat.ips_out_inval++; 479 return NULL; 480 } 481 IPSEC_ASSERT(*error == 0, ("sp w/ error set to %u", *error)); 482 switch (sp->policy) { 483 case IPSEC_POLICY_ENTRUST: 484 default: 485 printf("%s: invalid policy %u\n", __func__, sp->policy); 486 /* fall thru... */ 487 case IPSEC_POLICY_DISCARD: 488 V_ipsec4stat.ips_out_polvio++; 489 *error = -EINVAL; /* packet is discarded by caller */ 490 break; 491 case IPSEC_POLICY_BYPASS: 492 case IPSEC_POLICY_NONE: 493 KEY_FREESP(&sp); 494 sp = NULL; /* NB: force NULL result */ 495 break; 496 case IPSEC_POLICY_IPSEC: 497 if (sp->req == NULL) /* acquire an SA */ 498 *error = key_spdacquire(sp); 499 break; 500 } 501 if (*error != 0) { 502 KEY_FREESP(&sp); 503 sp = NULL; 504 } 505 return sp; 506 } 507 508 static int 509 ipsec4_setspidx_inpcb(m, pcb) 510 struct mbuf *m; 511 struct inpcb *pcb; 512 { 513 int error; 514 515 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 516 IPSEC_ASSERT(pcb->inp_sp != NULL, ("null inp_sp")); 517 IPSEC_ASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 518 ("null sp_in || sp_out")); 519 520 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 521 if (error == 0) { 522 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 523 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 524 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 525 } else { 526 bzero(&pcb->inp_sp->sp_in->spidx, 527 sizeof (pcb->inp_sp->sp_in->spidx)); 528 bzero(&pcb->inp_sp->sp_out->spidx, 529 sizeof (pcb->inp_sp->sp_in->spidx)); 530 } 531 return error; 532 } 533 534 #ifdef INET6 535 static int 536 ipsec6_setspidx_in6pcb(m, pcb) 537 struct mbuf *m; 538 struct in6pcb *pcb; 539 { 540 //INIT_VNET_IPSEC(curvnet); 541 struct secpolicyindex *spidx; 542 int error; 543 544 IPSEC_ASSERT(pcb != NULL, ("null pcb")); 545 IPSEC_ASSERT(pcb->in6p_sp != NULL, ("null inp_sp")); 546 IPSEC_ASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 547 ("null sp_in || sp_out")); 548 549 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 550 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 551 552 spidx = &pcb->in6p_sp->sp_in->spidx; 553 error = ipsec_setspidx(m, spidx, 1); 554 if (error) 555 goto bad; 556 spidx->dir = IPSEC_DIR_INBOUND; 557 558 spidx = &pcb->in6p_sp->sp_out->spidx; 559 error = ipsec_setspidx(m, spidx, 1); 560 if (error) 561 goto bad; 562 spidx->dir = IPSEC_DIR_OUTBOUND; 563 564 return 0; 565 566 bad: 567 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 568 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 569 return error; 570 } 571 #endif 572 573 /* 574 * configure security policy index (src/dst/proto/sport/dport) 575 * by looking at the content of mbuf. 576 * the caller is responsible for error recovery (like clearing up spidx). 577 */ 578 static int 579 ipsec_setspidx(m, spidx, needport) 580 struct mbuf *m; 581 struct secpolicyindex *spidx; 582 int needport; 583 { 584 INIT_VNET_IPSEC(curvnet); 585 struct ip *ip = NULL; 586 struct ip ipbuf; 587 u_int v; 588 struct mbuf *n; 589 int len; 590 int error; 591 592 IPSEC_ASSERT(m != NULL, ("null mbuf")); 593 594 /* 595 * validate m->m_pkthdr.len. we see incorrect length if we 596 * mistakenly call this function with inconsistent mbuf chain 597 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 598 */ 599 len = 0; 600 for (n = m; n; n = n->m_next) 601 len += n->m_len; 602 if (m->m_pkthdr.len != len) { 603 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 604 printf("%s: pkthdr len(%d) mismatch (%d), ignored.\n", 605 __func__, len, m->m_pkthdr.len)); 606 return EINVAL; 607 } 608 609 if (m->m_pkthdr.len < sizeof(struct ip)) { 610 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 611 printf("%s: pkthdr len(%d) too small (v4), ignored.\n", 612 __func__, m->m_pkthdr.len)); 613 return EINVAL; 614 } 615 616 if (m->m_len >= sizeof(*ip)) 617 ip = mtod(m, struct ip *); 618 else { 619 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 620 ip = &ipbuf; 621 } 622 #ifdef _IP_VHL 623 v = _IP_VHL_V(ip->ip_vhl); 624 #else 625 v = ip->ip_v; 626 #endif 627 switch (v) { 628 case 4: 629 error = ipsec4_setspidx_ipaddr(m, spidx); 630 if (error) 631 return error; 632 ipsec4_get_ulp(m, spidx, needport); 633 return 0; 634 #ifdef INET6 635 case 6: 636 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 637 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 638 printf("%s: pkthdr len(%d) too small (v6), " 639 "ignored\n", __func__, m->m_pkthdr.len)); 640 return EINVAL; 641 } 642 error = ipsec6_setspidx_ipaddr(m, spidx); 643 if (error) 644 return error; 645 ipsec6_get_ulp(m, spidx, needport); 646 return 0; 647 #endif 648 default: 649 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 650 printf("%s: " "unknown IP version %u, ignored.\n", 651 __func__, v)); 652 return EINVAL; 653 } 654 } 655 656 static void 657 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 658 { 659 u_int8_t nxt; 660 int off; 661 662 /* sanity check */ 663 IPSEC_ASSERT(m != NULL, ("null mbuf")); 664 IPSEC_ASSERT(m->m_pkthdr.len >= sizeof(struct ip),("packet too short")); 665 666 /* NB: ip_input() flips it into host endian XXX need more checking */ 667 if (m->m_len < sizeof (struct ip)) { 668 struct ip *ip = mtod(m, struct ip *); 669 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 670 goto done; 671 #ifdef _IP_VHL 672 off = _IP_VHL_HL(ip->ip_vhl) << 2; 673 #else 674 off = ip->ip_hl << 2; 675 #endif 676 nxt = ip->ip_p; 677 } else { 678 struct ip ih; 679 680 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 681 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 682 goto done; 683 #ifdef _IP_VHL 684 off = _IP_VHL_HL(ih.ip_vhl) << 2; 685 #else 686 off = ih.ip_hl << 2; 687 #endif 688 nxt = ih.ip_p; 689 } 690 691 while (off < m->m_pkthdr.len) { 692 struct ip6_ext ip6e; 693 struct tcphdr th; 694 struct udphdr uh; 695 696 switch (nxt) { 697 case IPPROTO_TCP: 698 spidx->ul_proto = nxt; 699 if (!needport) 700 goto done_proto; 701 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 702 goto done; 703 m_copydata(m, off, sizeof (th), (caddr_t) &th); 704 spidx->src.sin.sin_port = th.th_sport; 705 spidx->dst.sin.sin_port = th.th_dport; 706 return; 707 case IPPROTO_UDP: 708 spidx->ul_proto = nxt; 709 if (!needport) 710 goto done_proto; 711 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 712 goto done; 713 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 714 spidx->src.sin.sin_port = uh.uh_sport; 715 spidx->dst.sin.sin_port = uh.uh_dport; 716 return; 717 case IPPROTO_AH: 718 if (off + sizeof(ip6e) > m->m_pkthdr.len) 719 goto done; 720 /* XXX sigh, this works but is totally bogus */ 721 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 722 off += (ip6e.ip6e_len + 2) << 2; 723 nxt = ip6e.ip6e_nxt; 724 break; 725 case IPPROTO_ICMP: 726 default: 727 /* XXX intermediate headers??? */ 728 spidx->ul_proto = nxt; 729 goto done_proto; 730 } 731 } 732 done: 733 spidx->ul_proto = IPSEC_ULPROTO_ANY; 734 done_proto: 735 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 736 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 737 } 738 739 /* assumes that m is sane */ 740 static int 741 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 742 { 743 static const struct sockaddr_in template = { 744 sizeof (struct sockaddr_in), 745 AF_INET, 746 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 747 }; 748 749 spidx->src.sin = template; 750 spidx->dst.sin = template; 751 752 if (m->m_len < sizeof (struct ip)) { 753 m_copydata(m, offsetof(struct ip, ip_src), 754 sizeof (struct in_addr), 755 (caddr_t) &spidx->src.sin.sin_addr); 756 m_copydata(m, offsetof(struct ip, ip_dst), 757 sizeof (struct in_addr), 758 (caddr_t) &spidx->dst.sin.sin_addr); 759 } else { 760 struct ip *ip = mtod(m, struct ip *); 761 spidx->src.sin.sin_addr = ip->ip_src; 762 spidx->dst.sin.sin_addr = ip->ip_dst; 763 } 764 765 spidx->prefs = sizeof(struct in_addr) << 3; 766 spidx->prefd = sizeof(struct in_addr) << 3; 767 768 return 0; 769 } 770 771 #ifdef INET6 772 static void 773 ipsec6_get_ulp(m, spidx, needport) 774 struct mbuf *m; 775 struct secpolicyindex *spidx; 776 int needport; 777 { 778 INIT_VNET_IPSEC(curvnet); 779 int off, nxt; 780 struct tcphdr th; 781 struct udphdr uh; 782 struct icmp6_hdr ih; 783 784 /* sanity check */ 785 if (m == NULL) 786 panic("%s: NULL pointer was passed.\n", __func__); 787 788 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 789 printf("%s:\n", __func__); kdebug_mbuf(m)); 790 791 /* set default */ 792 spidx->ul_proto = IPSEC_ULPROTO_ANY; 793 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 794 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 795 796 nxt = -1; 797 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 798 if (off < 0 || m->m_pkthdr.len < off) 799 return; 800 801 switch (nxt) { 802 case IPPROTO_TCP: 803 spidx->ul_proto = nxt; 804 if (!needport) 805 break; 806 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 807 break; 808 m_copydata(m, off, sizeof(th), (caddr_t)&th); 809 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 810 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 811 break; 812 case IPPROTO_UDP: 813 spidx->ul_proto = nxt; 814 if (!needport) 815 break; 816 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 817 break; 818 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 819 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 820 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 821 break; 822 case IPPROTO_ICMPV6: 823 spidx->ul_proto = nxt; 824 if (off + sizeof(struct icmp6_hdr) > m->m_pkthdr.len) 825 break; 826 m_copydata(m, off, sizeof(ih), (caddr_t)&ih); 827 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = 828 htons((uint16_t)ih.icmp6_type); 829 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = 830 htons((uint16_t)ih.icmp6_code); 831 break; 832 default: 833 /* XXX intermediate headers??? */ 834 spidx->ul_proto = nxt; 835 break; 836 } 837 } 838 839 /* assumes that m is sane */ 840 static int 841 ipsec6_setspidx_ipaddr(m, spidx) 842 struct mbuf *m; 843 struct secpolicyindex *spidx; 844 { 845 struct ip6_hdr *ip6 = NULL; 846 struct ip6_hdr ip6buf; 847 struct sockaddr_in6 *sin6; 848 849 if (m->m_len >= sizeof(*ip6)) 850 ip6 = mtod(m, struct ip6_hdr *); 851 else { 852 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 853 ip6 = &ip6buf; 854 } 855 856 sin6 = (struct sockaddr_in6 *)&spidx->src; 857 bzero(sin6, sizeof(*sin6)); 858 sin6->sin6_family = AF_INET6; 859 sin6->sin6_len = sizeof(struct sockaddr_in6); 860 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 861 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 862 sin6->sin6_addr.s6_addr16[1] = 0; 863 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 864 } 865 spidx->prefs = sizeof(struct in6_addr) << 3; 866 867 sin6 = (struct sockaddr_in6 *)&spidx->dst; 868 bzero(sin6, sizeof(*sin6)); 869 sin6->sin6_family = AF_INET6; 870 sin6->sin6_len = sizeof(struct sockaddr_in6); 871 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 872 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 873 sin6->sin6_addr.s6_addr16[1] = 0; 874 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 875 } 876 spidx->prefd = sizeof(struct in6_addr) << 3; 877 878 return 0; 879 } 880 #endif 881 882 static void 883 ipsec_delpcbpolicy(p) 884 struct inpcbpolicy *p; 885 { 886 free(p, M_IPSEC_INPCB); 887 } 888 889 /* initialize policy in PCB */ 890 int 891 ipsec_init_policy(so, pcb_sp) 892 struct socket *so; 893 struct inpcbpolicy **pcb_sp; 894 { 895 INIT_VNET_IPSEC(curvnet); 896 struct inpcbpolicy *new; 897 898 /* sanity check. */ 899 if (so == NULL || pcb_sp == NULL) 900 panic("%s: NULL pointer was passed.\n", __func__); 901 902 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 903 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 904 if (new == NULL) { 905 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 906 return ENOBUFS; 907 } 908 909 new->priv = IPSEC_IS_PRIVILEGED_SO(so); 910 911 if ((new->sp_in = KEY_NEWSP()) == NULL) { 912 ipsec_delpcbpolicy(new); 913 return ENOBUFS; 914 } 915 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 916 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 917 918 if ((new->sp_out = KEY_NEWSP()) == NULL) { 919 KEY_FREESP(&new->sp_in); 920 ipsec_delpcbpolicy(new); 921 return ENOBUFS; 922 } 923 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 924 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 925 926 *pcb_sp = new; 927 928 return 0; 929 } 930 931 /* copy old ipsec policy into new */ 932 int 933 ipsec_copy_policy(old, new) 934 struct inpcbpolicy *old, *new; 935 { 936 struct secpolicy *sp; 937 938 sp = ipsec_deepcopy_policy(old->sp_in); 939 if (sp) { 940 KEY_FREESP(&new->sp_in); 941 new->sp_in = sp; 942 } else 943 return ENOBUFS; 944 945 sp = ipsec_deepcopy_policy(old->sp_out); 946 if (sp) { 947 KEY_FREESP(&new->sp_out); 948 new->sp_out = sp; 949 } else 950 return ENOBUFS; 951 952 new->priv = old->priv; 953 954 return 0; 955 } 956 957 struct ipsecrequest * 958 ipsec_newisr(void) 959 { 960 struct ipsecrequest *p; 961 962 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 963 if (p != NULL) 964 IPSECREQUEST_LOCK_INIT(p); 965 return p; 966 } 967 968 void 969 ipsec_delisr(struct ipsecrequest *p) 970 { 971 IPSECREQUEST_LOCK_DESTROY(p); 972 free(p, M_IPSEC_SR); 973 } 974 975 /* deep-copy a policy in PCB */ 976 static struct secpolicy * 977 ipsec_deepcopy_policy(src) 978 struct secpolicy *src; 979 { 980 struct ipsecrequest *newchain = NULL; 981 struct ipsecrequest *p; 982 struct ipsecrequest **q; 983 struct ipsecrequest *r; 984 struct secpolicy *dst; 985 986 if (src == NULL) 987 return NULL; 988 dst = KEY_NEWSP(); 989 if (dst == NULL) 990 return NULL; 991 992 /* 993 * deep-copy IPsec request chain. This is required since struct 994 * ipsecrequest is not reference counted. 995 */ 996 q = &newchain; 997 for (p = src->req; p; p = p->next) { 998 *q = ipsec_newisr(); 999 if (*q == NULL) 1000 goto fail; 1001 (*q)->saidx.proto = p->saidx.proto; 1002 (*q)->saidx.mode = p->saidx.mode; 1003 (*q)->level = p->level; 1004 (*q)->saidx.reqid = p->saidx.reqid; 1005 1006 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 1007 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 1008 1009 (*q)->sp = dst; 1010 1011 q = &((*q)->next); 1012 } 1013 1014 dst->req = newchain; 1015 dst->state = src->state; 1016 dst->policy = src->policy; 1017 /* do not touch the refcnt fields */ 1018 1019 return dst; 1020 1021 fail: 1022 for (p = newchain; p; p = r) { 1023 r = p->next; 1024 ipsec_delisr(p); 1025 p = NULL; 1026 } 1027 return NULL; 1028 } 1029 1030 /* set policy and ipsec request if present. */ 1031 static int 1032 ipsec_set_policy(pcb_sp, optname, request, len, cred) 1033 struct secpolicy **pcb_sp; 1034 int optname; 1035 caddr_t request; 1036 size_t len; 1037 struct ucred *cred; 1038 { 1039 INIT_VNET_IPSEC(curvnet); 1040 struct sadb_x_policy *xpl; 1041 struct secpolicy *newsp = NULL; 1042 int error; 1043 1044 /* sanity check. */ 1045 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1046 return EINVAL; 1047 if (len < sizeof(*xpl)) 1048 return EINVAL; 1049 xpl = (struct sadb_x_policy *)request; 1050 1051 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1052 printf("%s: passed policy\n", __func__); 1053 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1054 1055 /* check policy type */ 1056 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1057 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1058 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1059 return EINVAL; 1060 1061 /* check privileged socket */ 1062 if (cred != NULL && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1063 error = priv_check_cred(cred, PRIV_NETINET_IPSEC, 0); 1064 if (error) 1065 return EACCES; 1066 } 1067 1068 /* allocation new SP entry */ 1069 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1070 return error; 1071 1072 newsp->state = IPSEC_SPSTATE_ALIVE; 1073 1074 /* clear old SP and set new SP */ 1075 KEY_FREESP(pcb_sp); 1076 *pcb_sp = newsp; 1077 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1078 printf("%s: new policy\n", __func__); 1079 kdebug_secpolicy(newsp)); 1080 1081 return 0; 1082 } 1083 1084 static int 1085 ipsec_get_policy(pcb_sp, mp) 1086 struct secpolicy *pcb_sp; 1087 struct mbuf **mp; 1088 { 1089 INIT_VNET_IPSEC(curvnet); 1090 1091 /* sanity check. */ 1092 if (pcb_sp == NULL || mp == NULL) 1093 return EINVAL; 1094 1095 *mp = key_sp2msg(pcb_sp); 1096 if (!*mp) { 1097 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 1098 return ENOBUFS; 1099 } 1100 1101 (*mp)->m_type = MT_DATA; 1102 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1103 printf("%s:\n", __func__); kdebug_mbuf(*mp)); 1104 1105 return 0; 1106 } 1107 1108 int 1109 ipsec4_set_policy(inp, optname, request, len, cred) 1110 struct inpcb *inp; 1111 int optname; 1112 caddr_t request; 1113 size_t len; 1114 struct ucred *cred; 1115 { 1116 INIT_VNET_IPSEC(curvnet); 1117 struct sadb_x_policy *xpl; 1118 struct secpolicy **pcb_sp; 1119 1120 /* sanity check. */ 1121 if (inp == NULL || request == NULL) 1122 return EINVAL; 1123 if (len < sizeof(*xpl)) 1124 return EINVAL; 1125 xpl = (struct sadb_x_policy *)request; 1126 1127 /* select direction */ 1128 switch (xpl->sadb_x_policy_dir) { 1129 case IPSEC_DIR_INBOUND: 1130 pcb_sp = &inp->inp_sp->sp_in; 1131 break; 1132 case IPSEC_DIR_OUTBOUND: 1133 pcb_sp = &inp->inp_sp->sp_out; 1134 break; 1135 default: 1136 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1137 xpl->sadb_x_policy_dir)); 1138 return EINVAL; 1139 } 1140 1141 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1142 } 1143 1144 int 1145 ipsec4_get_policy(inp, request, len, mp) 1146 struct inpcb *inp; 1147 caddr_t request; 1148 size_t len; 1149 struct mbuf **mp; 1150 { 1151 INIT_VNET_IPSEC(curvnet); 1152 struct sadb_x_policy *xpl; 1153 struct secpolicy *pcb_sp; 1154 1155 /* sanity check. */ 1156 if (inp == NULL || request == NULL || mp == NULL) 1157 return EINVAL; 1158 IPSEC_ASSERT(inp->inp_sp != NULL, ("null inp_sp")); 1159 if (len < sizeof(*xpl)) 1160 return EINVAL; 1161 xpl = (struct sadb_x_policy *)request; 1162 1163 /* select direction */ 1164 switch (xpl->sadb_x_policy_dir) { 1165 case IPSEC_DIR_INBOUND: 1166 pcb_sp = inp->inp_sp->sp_in; 1167 break; 1168 case IPSEC_DIR_OUTBOUND: 1169 pcb_sp = inp->inp_sp->sp_out; 1170 break; 1171 default: 1172 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1173 xpl->sadb_x_policy_dir)); 1174 return EINVAL; 1175 } 1176 1177 return ipsec_get_policy(pcb_sp, mp); 1178 } 1179 1180 /* delete policy in PCB */ 1181 int 1182 ipsec4_delete_pcbpolicy(inp) 1183 struct inpcb *inp; 1184 { 1185 IPSEC_ASSERT(inp != NULL, ("null inp")); 1186 1187 if (inp->inp_sp == NULL) 1188 return 0; 1189 1190 if (inp->inp_sp->sp_in != NULL) 1191 KEY_FREESP(&inp->inp_sp->sp_in); 1192 1193 if (inp->inp_sp->sp_out != NULL) 1194 KEY_FREESP(&inp->inp_sp->sp_out); 1195 1196 ipsec_delpcbpolicy(inp->inp_sp); 1197 inp->inp_sp = NULL; 1198 1199 return 0; 1200 } 1201 1202 #ifdef INET6 1203 int 1204 ipsec6_set_policy(in6p, optname, request, len, cred) 1205 struct in6pcb *in6p; 1206 int optname; 1207 caddr_t request; 1208 size_t len; 1209 struct ucred *cred; 1210 { 1211 INIT_VNET_IPSEC(curvnet); 1212 struct sadb_x_policy *xpl; 1213 struct secpolicy **pcb_sp; 1214 1215 /* sanity check. */ 1216 if (in6p == NULL || request == NULL) 1217 return EINVAL; 1218 if (len < sizeof(*xpl)) 1219 return EINVAL; 1220 xpl = (struct sadb_x_policy *)request; 1221 1222 /* select direction */ 1223 switch (xpl->sadb_x_policy_dir) { 1224 case IPSEC_DIR_INBOUND: 1225 pcb_sp = &in6p->in6p_sp->sp_in; 1226 break; 1227 case IPSEC_DIR_OUTBOUND: 1228 pcb_sp = &in6p->in6p_sp->sp_out; 1229 break; 1230 default: 1231 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1232 xpl->sadb_x_policy_dir)); 1233 return EINVAL; 1234 } 1235 1236 return ipsec_set_policy(pcb_sp, optname, request, len, cred); 1237 } 1238 1239 int 1240 ipsec6_get_policy(in6p, request, len, mp) 1241 struct in6pcb *in6p; 1242 caddr_t request; 1243 size_t len; 1244 struct mbuf **mp; 1245 { 1246 INIT_VNET_IPSEC(curvnet); 1247 struct sadb_x_policy *xpl; 1248 struct secpolicy *pcb_sp; 1249 1250 /* sanity check. */ 1251 if (in6p == NULL || request == NULL || mp == NULL) 1252 return EINVAL; 1253 IPSEC_ASSERT(in6p->in6p_sp != NULL, ("null in6p_sp")); 1254 if (len < sizeof(*xpl)) 1255 return EINVAL; 1256 xpl = (struct sadb_x_policy *)request; 1257 1258 /* select direction */ 1259 switch (xpl->sadb_x_policy_dir) { 1260 case IPSEC_DIR_INBOUND: 1261 pcb_sp = in6p->in6p_sp->sp_in; 1262 break; 1263 case IPSEC_DIR_OUTBOUND: 1264 pcb_sp = in6p->in6p_sp->sp_out; 1265 break; 1266 default: 1267 ipseclog((LOG_ERR, "%s: invalid direction=%u\n", __func__, 1268 xpl->sadb_x_policy_dir)); 1269 return EINVAL; 1270 } 1271 1272 return ipsec_get_policy(pcb_sp, mp); 1273 } 1274 1275 int 1276 ipsec6_delete_pcbpolicy(in6p) 1277 struct in6pcb *in6p; 1278 { 1279 IPSEC_ASSERT(in6p != NULL, ("null in6p")); 1280 1281 if (in6p->in6p_sp == NULL) 1282 return 0; 1283 1284 if (in6p->in6p_sp->sp_in != NULL) 1285 KEY_FREESP(&in6p->in6p_sp->sp_in); 1286 1287 if (in6p->in6p_sp->sp_out != NULL) 1288 KEY_FREESP(&in6p->in6p_sp->sp_out); 1289 1290 ipsec_delpcbpolicy(in6p->in6p_sp); 1291 in6p->in6p_sp = NULL; 1292 1293 return 0; 1294 } 1295 #endif 1296 1297 /* 1298 * return current level. 1299 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1300 */ 1301 u_int 1302 ipsec_get_reqlevel(isr) 1303 struct ipsecrequest *isr; 1304 { 1305 INIT_VNET_IPSEC(curvnet); 1306 u_int level = 0; 1307 u_int esp_trans_deflev, esp_net_deflev; 1308 u_int ah_trans_deflev, ah_net_deflev; 1309 1310 IPSEC_ASSERT(isr != NULL && isr->sp != NULL, ("null argument")); 1311 IPSEC_ASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1312 ("af family mismatch, src %u, dst %u", 1313 isr->sp->spidx.src.sa.sa_family, 1314 isr->sp->spidx.dst.sa.sa_family)); 1315 1316 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1317 #define IPSEC_CHECK_DEFAULT(lev) \ 1318 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1319 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1320 ? (V_ipsec_debug \ 1321 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1322 (lev), IPSEC_LEVEL_REQUIRE) \ 1323 : 0), \ 1324 (lev) = IPSEC_LEVEL_REQUIRE, \ 1325 (lev) \ 1326 : (lev)) 1327 1328 /* set default level */ 1329 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1330 #ifdef INET 1331 case AF_INET: 1332 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_trans_deflev); 1333 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_esp_net_deflev); 1334 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_trans_deflev); 1335 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip4_ah_net_deflev); 1336 break; 1337 #endif 1338 #ifdef INET6 1339 case AF_INET6: 1340 esp_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_trans_deflev); 1341 esp_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_esp_net_deflev); 1342 ah_trans_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_trans_deflev); 1343 ah_net_deflev = IPSEC_CHECK_DEFAULT(V_ip6_ah_net_deflev); 1344 break; 1345 #endif /* INET6 */ 1346 default: 1347 panic("%s: unknown af %u", 1348 __func__, isr->sp->spidx.src.sa.sa_family); 1349 } 1350 1351 #undef IPSEC_CHECK_DEFAULT 1352 1353 /* set level */ 1354 switch (isr->level) { 1355 case IPSEC_LEVEL_DEFAULT: 1356 switch (isr->saidx.proto) { 1357 case IPPROTO_ESP: 1358 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1359 level = esp_net_deflev; 1360 else 1361 level = esp_trans_deflev; 1362 break; 1363 case IPPROTO_AH: 1364 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1365 level = ah_net_deflev; 1366 else 1367 level = ah_trans_deflev; 1368 break; 1369 case IPPROTO_IPCOMP: 1370 /* 1371 * we don't really care, as IPcomp document says that 1372 * we shouldn't compress small packets 1373 */ 1374 level = IPSEC_LEVEL_USE; 1375 break; 1376 default: 1377 panic("%s: Illegal protocol defined %u\n", __func__, 1378 isr->saidx.proto); 1379 } 1380 break; 1381 1382 case IPSEC_LEVEL_USE: 1383 case IPSEC_LEVEL_REQUIRE: 1384 level = isr->level; 1385 break; 1386 case IPSEC_LEVEL_UNIQUE: 1387 level = IPSEC_LEVEL_REQUIRE; 1388 break; 1389 1390 default: 1391 panic("%s: Illegal IPsec level %u\n", __func__, isr->level); 1392 } 1393 1394 return level; 1395 } 1396 1397 /* 1398 * Check security policy requirements against the actual 1399 * packet contents. Return one if the packet should be 1400 * reject as "invalid"; otherwiser return zero to have the 1401 * packet treated as "valid". 1402 * 1403 * OUT: 1404 * 0: valid 1405 * 1: invalid 1406 */ 1407 int 1408 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1409 { 1410 INIT_VNET_IPSEC(curvnet); 1411 struct ipsecrequest *isr; 1412 int need_auth; 1413 1414 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1415 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1416 1417 /* check policy */ 1418 switch (sp->policy) { 1419 case IPSEC_POLICY_DISCARD: 1420 return 1; 1421 case IPSEC_POLICY_BYPASS: 1422 case IPSEC_POLICY_NONE: 1423 return 0; 1424 } 1425 1426 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1427 ("invalid policy %u", sp->policy)); 1428 1429 /* XXX should compare policy against ipsec header history */ 1430 1431 need_auth = 0; 1432 for (isr = sp->req; isr != NULL; isr = isr->next) { 1433 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1434 continue; 1435 switch (isr->saidx.proto) { 1436 case IPPROTO_ESP: 1437 if ((m->m_flags & M_DECRYPTED) == 0) { 1438 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1439 printf("%s: ESP m_flags:%x\n", __func__, 1440 m->m_flags)); 1441 return 1; 1442 } 1443 1444 if (!need_auth && 1445 isr->sav != NULL && 1446 isr->sav->tdb_authalgxform != NULL && 1447 (m->m_flags & M_AUTHIPDGM) == 0) { 1448 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1449 printf("%s: ESP/AH m_flags:%x\n", __func__, 1450 m->m_flags)); 1451 return 1; 1452 } 1453 break; 1454 case IPPROTO_AH: 1455 need_auth = 1; 1456 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1457 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1458 printf("%s: AH m_flags:%x\n", __func__, 1459 m->m_flags)); 1460 return 1; 1461 } 1462 break; 1463 case IPPROTO_IPCOMP: 1464 /* 1465 * we don't really care, as IPcomp document 1466 * says that we shouldn't compress small 1467 * packets, IPComp policy should always be 1468 * treated as being in "use" level. 1469 */ 1470 break; 1471 } 1472 } 1473 return 0; /* valid */ 1474 } 1475 1476 /* 1477 * Check AH/ESP integrity. 1478 * This function is called from tcp_input(), udp_input(), 1479 * and {ah,esp}4_input for tunnel mode 1480 */ 1481 int 1482 ipsec4_in_reject(m, inp) 1483 struct mbuf *m; 1484 struct inpcb *inp; 1485 { 1486 INIT_VNET_IPSEC(curvnet); 1487 struct secpolicy *sp; 1488 int error; 1489 int result; 1490 1491 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1492 1493 /* get SP for this packet. 1494 * When we are called from ip_forward(), we call 1495 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1496 */ 1497 if (inp == NULL) 1498 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1499 else 1500 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1501 1502 if (sp != NULL) { 1503 result = ipsec_in_reject(sp, m); 1504 if (result) 1505 V_ipsec4stat.ips_in_polvio++; 1506 KEY_FREESP(&sp); 1507 } else { 1508 result = 0; /* XXX should be panic ? 1509 * -> No, there may be error. */ 1510 } 1511 return result; 1512 } 1513 1514 #ifdef INET6 1515 /* 1516 * Check AH/ESP integrity. 1517 * This function is called from tcp6_input(), udp6_input(), 1518 * and {ah,esp}6_input for tunnel mode 1519 */ 1520 int 1521 ipsec6_in_reject(m, inp) 1522 struct mbuf *m; 1523 struct inpcb *inp; 1524 { 1525 INIT_VNET_IPSEC(curvnet); 1526 struct secpolicy *sp = NULL; 1527 int error; 1528 int result; 1529 1530 /* sanity check */ 1531 if (m == NULL) 1532 return 0; /* XXX should be panic ? */ 1533 1534 /* get SP for this packet. 1535 * When we are called from ip_forward(), we call 1536 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1537 */ 1538 if (inp == NULL) 1539 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1540 else 1541 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1542 1543 if (sp != NULL) { 1544 result = ipsec_in_reject(sp, m); 1545 if (result) 1546 V_ipsec6stat.ips_in_polvio++; 1547 KEY_FREESP(&sp); 1548 } else { 1549 result = 0; 1550 } 1551 return result; 1552 } 1553 #endif 1554 1555 /* 1556 * compute the byte size to be occupied by IPsec header. 1557 * in case it is tunneled, it includes the size of outer IP header. 1558 * NOTE: SP passed is free in this function. 1559 */ 1560 static size_t 1561 ipsec_hdrsiz(struct secpolicy *sp) 1562 { 1563 INIT_VNET_IPSEC(curvnet); 1564 struct ipsecrequest *isr; 1565 size_t siz; 1566 1567 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1568 printf("%s: using SP\n", __func__); kdebug_secpolicy(sp)); 1569 1570 switch (sp->policy) { 1571 case IPSEC_POLICY_DISCARD: 1572 case IPSEC_POLICY_BYPASS: 1573 case IPSEC_POLICY_NONE: 1574 return 0; 1575 } 1576 1577 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1578 ("invalid policy %u", sp->policy)); 1579 1580 siz = 0; 1581 for (isr = sp->req; isr != NULL; isr = isr->next) { 1582 size_t clen = 0; 1583 1584 switch (isr->saidx.proto) { 1585 case IPPROTO_ESP: 1586 clen = esp_hdrsiz(isr->sav); 1587 break; 1588 case IPPROTO_AH: 1589 clen = ah_hdrsiz(isr->sav); 1590 break; 1591 case IPPROTO_IPCOMP: 1592 clen = sizeof(struct ipcomp); 1593 break; 1594 } 1595 1596 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1597 switch (isr->saidx.dst.sa.sa_family) { 1598 case AF_INET: 1599 clen += sizeof(struct ip); 1600 break; 1601 #ifdef INET6 1602 case AF_INET6: 1603 clen += sizeof(struct ip6_hdr); 1604 break; 1605 #endif 1606 default: 1607 ipseclog((LOG_ERR, "%s: unknown AF %d in " 1608 "IPsec tunnel SA\n", __func__, 1609 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1610 break; 1611 } 1612 } 1613 siz += clen; 1614 } 1615 1616 return siz; 1617 } 1618 1619 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1620 size_t 1621 ipsec4_hdrsiz(m, dir, inp) 1622 struct mbuf *m; 1623 u_int dir; 1624 struct inpcb *inp; 1625 { 1626 INIT_VNET_IPSEC(curvnet); 1627 struct secpolicy *sp; 1628 int error; 1629 size_t size; 1630 1631 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1632 1633 /* get SP for this packet. 1634 * When we are called from ip_forward(), we call 1635 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1636 */ 1637 if (inp == NULL) 1638 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1639 else 1640 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1641 1642 if (sp != NULL) { 1643 size = ipsec_hdrsiz(sp); 1644 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1645 printf("%s: size:%lu.\n", __func__, 1646 (unsigned long)size)); 1647 1648 KEY_FREESP(&sp); 1649 } else { 1650 size = 0; /* XXX should be panic ? 1651 * -> No, we are called w/o knowing if 1652 * IPsec processing is needed. */ 1653 } 1654 return size; 1655 } 1656 1657 #ifdef INET6 1658 /* This function is called from ipsec6_hdrsize_tcp(), 1659 * and maybe from ip6_forward.() 1660 */ 1661 size_t 1662 ipsec6_hdrsiz(m, dir, in6p) 1663 struct mbuf *m; 1664 u_int dir; 1665 struct in6pcb *in6p; 1666 { 1667 INIT_VNET_IPSEC(curvnet); 1668 struct secpolicy *sp; 1669 int error; 1670 size_t size; 1671 1672 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1673 IPSEC_ASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1674 ("socket w/o inpcb")); 1675 1676 /* get SP for this packet */ 1677 /* XXX Is it right to call with IP_FORWARDING. */ 1678 if (in6p == NULL) 1679 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1680 else 1681 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1682 1683 if (sp == NULL) 1684 return 0; 1685 size = ipsec_hdrsiz(sp); 1686 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1687 printf("%s: size:%lu.\n", __func__, (unsigned long)size)); 1688 KEY_FREESP(&sp); 1689 1690 return size; 1691 } 1692 #endif /*INET6*/ 1693 1694 /* 1695 * Check the variable replay window. 1696 * ipsec_chkreplay() performs replay check before ICV verification. 1697 * ipsec_updatereplay() updates replay bitmap. This must be called after 1698 * ICV verification (it also performs replay check, which is usually done 1699 * beforehand). 1700 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1701 * 1702 * based on RFC 2401. 1703 */ 1704 int 1705 ipsec_chkreplay(seq, sav) 1706 u_int32_t seq; 1707 struct secasvar *sav; 1708 { 1709 const struct secreplay *replay; 1710 u_int32_t diff; 1711 int fr; 1712 u_int32_t wsizeb; /* constant: bits of window size */ 1713 int frlast; /* constant: last frame */ 1714 1715 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1716 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1717 1718 replay = sav->replay; 1719 1720 if (replay->wsize == 0) 1721 return 1; /* no need to check replay. */ 1722 1723 /* constant */ 1724 frlast = replay->wsize - 1; 1725 wsizeb = replay->wsize << 3; 1726 1727 /* sequence number of 0 is invalid */ 1728 if (seq == 0) 1729 return 0; 1730 1731 /* first time is always okay */ 1732 if (replay->count == 0) 1733 return 1; 1734 1735 if (seq > replay->lastseq) { 1736 /* larger sequences are okay */ 1737 return 1; 1738 } else { 1739 /* seq is equal or less than lastseq. */ 1740 diff = replay->lastseq - seq; 1741 1742 /* over range to check, i.e. too old or wrapped */ 1743 if (diff >= wsizeb) 1744 return 0; 1745 1746 fr = frlast - diff / 8; 1747 1748 /* this packet already seen ? */ 1749 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1750 return 0; 1751 1752 /* out of order but good */ 1753 return 1; 1754 } 1755 } 1756 1757 /* 1758 * check replay counter whether to update or not. 1759 * OUT: 0: OK 1760 * 1: NG 1761 */ 1762 int 1763 ipsec_updatereplay(seq, sav) 1764 u_int32_t seq; 1765 struct secasvar *sav; 1766 { 1767 INIT_VNET_IPSEC(curvnet); 1768 struct secreplay *replay; 1769 u_int32_t diff; 1770 int fr; 1771 u_int32_t wsizeb; /* constant: bits of window size */ 1772 int frlast; /* constant: last frame */ 1773 1774 IPSEC_ASSERT(sav != NULL, ("Null SA")); 1775 IPSEC_ASSERT(sav->replay != NULL, ("Null replay state")); 1776 1777 replay = sav->replay; 1778 1779 if (replay->wsize == 0) 1780 goto ok; /* no need to check replay. */ 1781 1782 /* constant */ 1783 frlast = replay->wsize - 1; 1784 wsizeb = replay->wsize << 3; 1785 1786 /* sequence number of 0 is invalid */ 1787 if (seq == 0) 1788 return 1; 1789 1790 /* first time */ 1791 if (replay->count == 0) { 1792 replay->lastseq = seq; 1793 bzero(replay->bitmap, replay->wsize); 1794 (replay->bitmap)[frlast] = 1; 1795 goto ok; 1796 } 1797 1798 if (seq > replay->lastseq) { 1799 /* seq is larger than lastseq. */ 1800 diff = seq - replay->lastseq; 1801 1802 /* new larger sequence number */ 1803 if (diff < wsizeb) { 1804 /* In window */ 1805 /* set bit for this packet */ 1806 vshiftl(replay->bitmap, diff, replay->wsize); 1807 (replay->bitmap)[frlast] |= 1; 1808 } else { 1809 /* this packet has a "way larger" */ 1810 bzero(replay->bitmap, replay->wsize); 1811 (replay->bitmap)[frlast] = 1; 1812 } 1813 replay->lastseq = seq; 1814 1815 /* larger is good */ 1816 } else { 1817 /* seq is equal or less than lastseq. */ 1818 diff = replay->lastseq - seq; 1819 1820 /* over range to check, i.e. too old or wrapped */ 1821 if (diff >= wsizeb) 1822 return 1; 1823 1824 fr = frlast - diff / 8; 1825 1826 /* this packet already seen ? */ 1827 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1828 return 1; 1829 1830 /* mark as seen */ 1831 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1832 1833 /* out of order but good */ 1834 } 1835 1836 ok: 1837 if (replay->count == ~0) { 1838 1839 /* set overflow flag */ 1840 replay->overflow++; 1841 1842 /* don't increment, no more packets accepted */ 1843 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1844 return 1; 1845 1846 ipseclog((LOG_WARNING, "%s: replay counter made %d cycle. %s\n", 1847 __func__, replay->overflow, ipsec_logsastr(sav))); 1848 } 1849 1850 replay->count++; 1851 1852 return 0; 1853 } 1854 1855 /* 1856 * shift variable length buffer to left. 1857 * IN: bitmap: pointer to the buffer 1858 * nbit: the number of to shift. 1859 * wsize: buffer size (bytes). 1860 */ 1861 static void 1862 vshiftl(bitmap, nbit, wsize) 1863 unsigned char *bitmap; 1864 int nbit, wsize; 1865 { 1866 int s, j, i; 1867 unsigned char over; 1868 1869 for (j = 0; j < nbit; j += 8) { 1870 s = (nbit - j < 8) ? (nbit - j): 8; 1871 bitmap[0] <<= s; 1872 for (i = 1; i < wsize; i++) { 1873 over = (bitmap[i] >> (8 - s)); 1874 bitmap[i] <<= s; 1875 bitmap[i-1] |= over; 1876 } 1877 } 1878 1879 return; 1880 } 1881 1882 /* Return a printable string for the IPv4 address. */ 1883 static char * 1884 inet_ntoa4(struct in_addr ina) 1885 { 1886 static char buf[4][4 * sizeof "123" + 4]; 1887 unsigned char *ucp = (unsigned char *) &ina; 1888 static int i = 3; 1889 1890 /* XXX-BZ returns static buffer. */ 1891 i = (i + 1) % 4; 1892 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1893 ucp[2] & 0xff, ucp[3] & 0xff); 1894 return (buf[i]); 1895 } 1896 1897 /* Return a printable string for the address. */ 1898 char * 1899 ipsec_address(union sockaddr_union* sa) 1900 { 1901 #ifdef INET6 1902 char ip6buf[INET6_ADDRSTRLEN]; 1903 #endif 1904 switch (sa->sa.sa_family) { 1905 #ifdef INET 1906 case AF_INET: 1907 return inet_ntoa4(sa->sin.sin_addr); 1908 #endif /* INET */ 1909 1910 #ifdef INET6 1911 case AF_INET6: 1912 return ip6_sprintf(ip6buf, &sa->sin6.sin6_addr); 1913 #endif /* INET6 */ 1914 1915 default: 1916 return "(unknown address family)"; 1917 } 1918 } 1919 1920 const char * 1921 ipsec_logsastr(sav) 1922 struct secasvar *sav; 1923 { 1924 static char buf[256]; 1925 char *p; 1926 struct secasindex *saidx = &sav->sah->saidx; 1927 1928 IPSEC_ASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1929 ("address family mismatch")); 1930 1931 p = buf; 1932 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1933 while (p && *p) 1934 p++; 1935 /* NB: only use ipsec_address on one address at a time */ 1936 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1937 ipsec_address(&saidx->src)); 1938 while (p && *p) 1939 p++; 1940 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1941 ipsec_address(&saidx->dst)); 1942 1943 return buf; 1944 } 1945 1946 void 1947 ipsec_dumpmbuf(m) 1948 struct mbuf *m; 1949 { 1950 int totlen; 1951 int i; 1952 u_char *p; 1953 1954 totlen = 0; 1955 printf("---\n"); 1956 while (m) { 1957 p = mtod(m, u_char *); 1958 for (i = 0; i < m->m_len; i++) { 1959 printf("%02x ", p[i]); 1960 totlen++; 1961 if (totlen % 16 == 0) 1962 printf("\n"); 1963 } 1964 m = m->m_next; 1965 } 1966 if (totlen % 16 != 0) 1967 printf("\n"); 1968 printf("---\n"); 1969 } 1970 1971 static void 1972 ipsec_attach(void) 1973 { 1974 SECPOLICY_LOCK_INIT(&V_ip4_def_policy); 1975 ip4_def_policy.refcnt = 1; /* NB: disallow free */ 1976 } 1977 SYSINIT(ipsec, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, ipsec_attach, NULL); 1978 1979 1980 /* XXX this stuff doesn't belong here... */ 1981 1982 static struct xformsw* xforms = NULL; 1983 1984 /* 1985 * Register a transform; typically at system startup. 1986 */ 1987 void 1988 xform_register(struct xformsw* xsp) 1989 { 1990 xsp->xf_next = xforms; 1991 xforms = xsp; 1992 } 1993 1994 /* 1995 * Initialize transform support in an sav. 1996 */ 1997 int 1998 xform_init(struct secasvar *sav, int xftype) 1999 { 2000 struct xformsw *xsp; 2001 2002 if (sav->tdb_xform != NULL) /* previously initialized */ 2003 return 0; 2004 for (xsp = xforms; xsp; xsp = xsp->xf_next) 2005 if (xsp->xf_type == xftype) 2006 return (*xsp->xf_init)(sav, xsp); 2007 return EINVAL; 2008 } 2009