Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/ipsec.c
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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/protosw.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/errno.h> 50 #include <sys/time.h> 51 #include <sys/kernel.h> 52 #include <sys/syslog.h> 53 #include <sys/sysctl.h> 54 #include <sys/proc.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_systm.h> 61 #include <netinet/ip.h> 62 #include <netinet/ip_var.h> 63 #include <netinet/in_var.h> 64 #include <netinet/udp.h> 65 #include <netinet/udp_var.h> 66 #include <netinet/tcp.h> 67 #include <netinet/udp.h> 68 69 #include <netinet/ip6.h> 70 #ifdef INET6 71 #include <netinet6/ip6_var.h> 72 #endif 73 #include <netinet/in_pcb.h> 74 #ifdef INET6 75 #include <netinet/icmp6.h> 76 #endif 77 78 #include <netipsec/ipsec.h> 79 #ifdef INET6 80 #include <netipsec/ipsec6.h> 81 #endif 82 #include <netipsec/ah_var.h> 83 #include <netipsec/esp_var.h> 84 #include <netipsec/ipcomp.h> /*XXX*/ 85 #include <netipsec/ipcomp_var.h> 86 87 #include <netipsec/key.h> 88 #include <netipsec/keydb.h> 89 #include <netipsec/key_debug.h> 90 91 #include <netipsec/xform.h> 92 93 #include <machine/in_cksum.h> 94 95 #include <net/net_osdep.h> 96 97 #ifdef IPSEC_DEBUG 98 int ipsec_debug = 1; 99 #else 100 int ipsec_debug = 0; 101 #endif 102 103 /* NB: name changed so netstat doesn't use it */ 104 struct newipsecstat newipsecstat; 105 int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ 106 int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ 107 int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; 108 int ip4_esp_net_deflev = IPSEC_LEVEL_USE; 109 int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; 110 int ip4_ah_net_deflev = IPSEC_LEVEL_USE; 111 struct secpolicy ip4_def_policy; 112 int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 113 int ip4_esp_randpad = -1; 114 /* 115 * Crypto support requirements: 116 * 117 * 1 require hardware support 118 * -1 require software support 119 * 0 take anything 120 */ 121 int crypto_support = 0; 122 123 SYSCTL_DECL(_net_inet_ipsec); 124 125 /* net.inet.ipsec */ 126 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, 127 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 128 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 129 CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); 130 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 131 CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); 132 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 133 CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); 134 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 135 CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); 136 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, 137 ah_cleartos, CTLFLAG_RW, &ah_cleartos, 0, ""); 138 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, 139 ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); 140 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, 141 dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); 142 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, 143 ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); 144 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEBUG, 145 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 146 SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ESP_RANDPAD, 147 esp_randpad, CTLFLAG_RW, &ip4_esp_randpad, 0, ""); 148 SYSCTL_INT(_net_inet_ipsec, OID_AUTO, 149 crypto_support, CTLFLAG_RW, &crypto_support,0, ""); 150 SYSCTL_STRUCT(_net_inet_ipsec, OID_AUTO, 151 ipsecstats, CTLFLAG_RD, &newipsecstat, newipsecstat, ""); 152 153 #ifdef INET6 154 int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; 155 int ip6_esp_net_deflev = IPSEC_LEVEL_USE; 156 int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; 157 int ip6_ah_net_deflev = IPSEC_LEVEL_USE; 158 int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ 159 int ip6_esp_randpad = -1; 160 161 SYSCTL_DECL(_net_inet6_ipsec6); 162 163 /* net.inet6.ipsec6 */ 164 #ifdef COMPAT_KAME 165 SYSCTL_OID(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, 166 0,0, compat_ipsecstats_sysctl, "S", ""); 167 #endif /* COMPAT_KAME */ 168 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, 169 def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); 170 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, 171 CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); 172 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, 173 CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); 174 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, 175 CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); 176 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, 177 CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); 178 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, 179 ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); 180 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEBUG, 181 debug, CTLFLAG_RW, &ipsec_debug, 0, ""); 182 SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ESP_RANDPAD, 183 esp_randpad, CTLFLAG_RW, &ip6_esp_randpad, 0, ""); 184 #endif /* INET6 */ 185 186 static int ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); 187 #ifdef INET6 188 static int ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); 189 #endif 190 static int ipsec_setspidx __P((struct mbuf *, struct secpolicyindex *, int)); 191 static void ipsec4_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 192 static int ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 193 #ifdef INET6 194 static void ipsec6_get_ulp __P((struct mbuf *m, struct secpolicyindex *, int)); 195 static int ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); 196 #endif 197 static void ipsec_delpcbpolicy __P((struct inpcbpolicy *)); 198 static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); 199 static int ipsec_set_policy __P((struct secpolicy **pcb_sp, 200 int optname, caddr_t request, size_t len, int priv)); 201 static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); 202 static void vshiftl __P((unsigned char *, int, int)); 203 static size_t ipsec_hdrsiz __P((struct secpolicy *)); 204 205 /* 206 * Return a held reference to the default SP. 207 */ 208 static struct secpolicy * 209 key_allocsp_default(const char* where, int tag) 210 { 211 struct secpolicy *sp; 212 213 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 214 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 215 216 sp = &ip4_def_policy; 217 if (sp->policy != IPSEC_POLICY_DISCARD && 218 sp->policy != IPSEC_POLICY_NONE) { 219 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 220 sp->policy, IPSEC_POLICY_NONE)); 221 sp->policy = IPSEC_POLICY_NONE; 222 } 223 sp->refcnt++; 224 225 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 226 printf("DP key_allocsp_default returns SP:%p (%u)\n", 227 sp, sp->refcnt)); 228 return sp; 229 } 230 #define KEY_ALLOCSP_DEFAULT() \ 231 key_allocsp_default(__FILE__, __LINE__) 232 233 /* 234 * For OUTBOUND packet having a socket. Searching SPD for packet, 235 * and return a pointer to SP. 236 * OUT: NULL: no apropreate SP found, the following value is set to error. 237 * 0 : bypass 238 * EACCES : discard packet. 239 * ENOENT : ipsec_acquire() in progress, maybe. 240 * others : error occured. 241 * others: a pointer to SP 242 * 243 * NOTE: IPv6 mapped adddress concern is implemented here. 244 */ 245 struct secpolicy * 246 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 247 { 248 struct secpolicy *sp; 249 250 KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 251 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 252 ("ipsec_getpolicy: invalid direction %u", dir)); 253 254 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 255 if (sp == NULL) /*XXX????*/ 256 sp = KEY_ALLOCSP_DEFAULT(); 257 KASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 258 return sp; 259 } 260 261 /* 262 * For OUTBOUND packet having a socket. Searching SPD for packet, 263 * and return a pointer to SP. 264 * OUT: NULL: no apropreate SP found, the following value is set to error. 265 * 0 : bypass 266 * EACCES : discard packet. 267 * ENOENT : ipsec_acquire() in progress, maybe. 268 * others : error occured. 269 * others: a pointer to SP 270 * 271 * NOTE: IPv6 mapped adddress concern is implemented here. 272 */ 273 struct secpolicy * 274 ipsec_getpolicybysock(m, dir, inp, error) 275 struct mbuf *m; 276 u_int dir; 277 struct inpcb *inp; 278 int *error; 279 { 280 struct inpcbpolicy *pcbsp = NULL; 281 struct secpolicy *currsp = NULL; /* policy on socket */ 282 struct secpolicy *sp; 283 int af; 284 285 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 286 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 287 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 288 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 289 ("ipsec_getpolicybysock: invalid direction %u", dir)); 290 291 af = inp->inp_socket->so_proto->pr_domain->dom_family; 292 KASSERT(af == AF_INET || af == AF_INET6, 293 ("ipsec_getpolicybysock: unexpected protocol family %u", af)); 294 295 switch (af) { 296 case AF_INET: 297 /* set spidx in pcb */ 298 *error = ipsec4_setspidx_inpcb(m, inp); 299 pcbsp = inp->inp_sp; 300 break; 301 #ifdef INET6 302 case AF_INET6: 303 /* set spidx in pcb */ 304 *error = ipsec6_setspidx_in6pcb(m, inp); 305 pcbsp = inp->in6p_sp; 306 break; 307 #endif 308 default: 309 *error = EPFNOSUPPORT; 310 break; 311 } 312 if (*error) 313 return NULL; 314 315 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 316 switch (dir) { 317 case IPSEC_DIR_INBOUND: 318 currsp = pcbsp->sp_in; 319 break; 320 case IPSEC_DIR_OUTBOUND: 321 currsp = pcbsp->sp_out; 322 break; 323 } 324 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 325 326 if (pcbsp->priv) { /* when privilieged socket */ 327 switch (currsp->policy) { 328 case IPSEC_POLICY_BYPASS: 329 case IPSEC_POLICY_IPSEC: 330 currsp->refcnt++; 331 sp = currsp; 332 break; 333 334 case IPSEC_POLICY_ENTRUST: 335 /* look for a policy in SPD */ 336 sp = KEY_ALLOCSP(&currsp->spidx, dir); 337 if (sp == NULL) /* no SP found */ 338 sp = KEY_ALLOCSP_DEFAULT(); 339 break; 340 341 default: 342 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 343 "Invalid policy for PCB %d\n", currsp->policy)); 344 *error = EINVAL; 345 return NULL; 346 } 347 } else { /* unpriv, SPD has policy */ 348 sp = KEY_ALLOCSP(&currsp->spidx, dir); 349 if (sp == NULL) { /* no SP found */ 350 switch (currsp->policy) { 351 case IPSEC_POLICY_BYPASS: 352 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 353 "Illegal policy for non-priviliged defined %d\n", 354 currsp->policy)); 355 *error = EINVAL; 356 return NULL; 357 358 case IPSEC_POLICY_ENTRUST: 359 sp = KEY_ALLOCSP_DEFAULT(); 360 break; 361 362 case IPSEC_POLICY_IPSEC: 363 currsp->refcnt++; 364 sp = currsp; 365 break; 366 367 default: 368 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 369 "Invalid policy for PCB %d\n", currsp->policy)); 370 *error = EINVAL; 371 return NULL; 372 } 373 } 374 } 375 KASSERT(sp != NULL, 376 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 377 pcbsp->priv, currsp->policy)); 378 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 379 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 380 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 381 sp, sp->refcnt)); 382 return sp; 383 } 384 385 /* 386 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 387 * and return a pointer to SP. 388 * OUT: positive: a pointer to the entry for security policy leaf matched. 389 * NULL: no apropreate SP found, the following value is set to error. 390 * 0 : bypass 391 * EACCES : discard packet. 392 * ENOENT : ipsec_acquire() in progress, maybe. 393 * others : error occured. 394 */ 395 struct secpolicy * 396 ipsec_getpolicybyaddr(m, dir, flag, error) 397 struct mbuf *m; 398 u_int dir; 399 int flag; 400 int *error; 401 { 402 struct secpolicyindex spidx; 403 struct secpolicy *sp; 404 405 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 406 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 407 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 408 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 409 410 sp = NULL; 411 if (key_havesp(dir)) { 412 /* Make an index to look for a policy. */ 413 *error = ipsec_setspidx(m, &spidx, 414 (flag & IP_FORWARDING) ? 0 : 1); 415 if (*error != 0) { 416 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 417 " dir %u flag %u\n", dir, flag)); 418 bzero(&spidx, sizeof (spidx)); 419 return NULL; 420 } 421 spidx.dir = dir; 422 423 sp = KEY_ALLOCSP(&spidx, dir); 424 } 425 if (sp == NULL) /* no SP found, use system default */ 426 sp = KEY_ALLOCSP_DEFAULT(); 427 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 428 return sp; 429 } 430 431 struct secpolicy * 432 ipsec4_checkpolicy(m, dir, flag, error, inp) 433 struct mbuf *m; 434 u_int dir, flag; 435 int *error; 436 struct inpcb *inp; 437 { 438 struct secpolicy *sp; 439 440 *error = 0; 441 if (inp == NULL) 442 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 443 else 444 sp = ipsec_getpolicybysock(m, dir, inp, error); 445 if (sp == NULL) { 446 KASSERT(*error != 0, 447 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 448 newipsecstat.ips_out_inval++; 449 return NULL; 450 } 451 KASSERT(*error == 0, 452 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 453 switch (sp->policy) { 454 case IPSEC_POLICY_ENTRUST: 455 default: 456 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 457 /* fall thru... */ 458 case IPSEC_POLICY_DISCARD: 459 newipsecstat.ips_out_polvio++; 460 *error = -EINVAL; /* packet is discarded by caller */ 461 break; 462 case IPSEC_POLICY_BYPASS: 463 case IPSEC_POLICY_NONE: 464 KEY_FREESP(&sp); 465 sp = NULL; /* NB: force NULL result */ 466 break; 467 case IPSEC_POLICY_IPSEC: 468 if (sp->req == NULL) /* acquire an SA */ 469 *error = key_spdacquire(sp); 470 break; 471 } 472 if (*error != 0) { 473 KEY_FREESP(&sp); 474 sp = NULL; 475 } 476 return sp; 477 } 478 479 static int 480 ipsec4_setspidx_inpcb(m, pcb) 481 struct mbuf *m; 482 struct inpcb *pcb; 483 { 484 int error; 485 486 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 487 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 488 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 489 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 490 491 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 492 if (error == 0) { 493 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 494 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 495 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 496 } else { 497 bzero(&pcb->inp_sp->sp_in->spidx, 498 sizeof (pcb->inp_sp->sp_in->spidx)); 499 bzero(&pcb->inp_sp->sp_out->spidx, 500 sizeof (pcb->inp_sp->sp_in->spidx)); 501 } 502 return error; 503 } 504 505 #ifdef INET6 506 static int 507 ipsec6_setspidx_in6pcb(m, pcb) 508 struct mbuf *m; 509 struct in6pcb *pcb; 510 { 511 struct secpolicyindex *spidx; 512 int error; 513 514 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 515 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 516 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 517 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 518 519 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 520 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 521 522 spidx = &pcb->in6p_sp->sp_in->spidx; 523 error = ipsec_setspidx(m, spidx, 1); 524 if (error) 525 goto bad; 526 spidx->dir = IPSEC_DIR_INBOUND; 527 528 spidx = &pcb->in6p_sp->sp_out->spidx; 529 error = ipsec_setspidx(m, spidx, 1); 530 if (error) 531 goto bad; 532 spidx->dir = IPSEC_DIR_OUTBOUND; 533 534 return 0; 535 536 bad: 537 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 538 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 539 return error; 540 } 541 #endif 542 543 /* 544 * configure security policy index (src/dst/proto/sport/dport) 545 * by looking at the content of mbuf. 546 * the caller is responsible for error recovery (like clearing up spidx). 547 */ 548 static int 549 ipsec_setspidx(m, spidx, needport) 550 struct mbuf *m; 551 struct secpolicyindex *spidx; 552 int needport; 553 { 554 struct ip *ip = NULL; 555 struct ip ipbuf; 556 u_int v; 557 struct mbuf *n; 558 int len; 559 int error; 560 561 KASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 562 563 /* 564 * validate m->m_pkthdr.len. we see incorrect length if we 565 * mistakenly call this function with inconsistent mbuf chain 566 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 567 */ 568 len = 0; 569 for (n = m; n; n = n->m_next) 570 len += n->m_len; 571 if (m->m_pkthdr.len != len) { 572 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 573 printf("ipsec_setspidx: " 574 "total of m_len(%d) != pkthdr.len(%d), " 575 "ignored.\n", 576 len, m->m_pkthdr.len)); 577 return EINVAL; 578 } 579 580 if (m->m_pkthdr.len < sizeof(struct ip)) { 581 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 582 printf("ipsec_setspidx: " 583 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 584 m->m_pkthdr.len)); 585 return EINVAL; 586 } 587 588 if (m->m_len >= sizeof(*ip)) 589 ip = mtod(m, struct ip *); 590 else { 591 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 592 ip = &ipbuf; 593 } 594 #ifdef _IP_VHL 595 v = _IP_VHL_V(ip->ip_vhl); 596 #else 597 v = ip->ip_v; 598 #endif 599 switch (v) { 600 case 4: 601 error = ipsec4_setspidx_ipaddr(m, spidx); 602 if (error) 603 return error; 604 ipsec4_get_ulp(m, spidx, needport); 605 return 0; 606 #ifdef INET6 607 case 6: 608 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 609 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 610 printf("ipsec_setspidx: " 611 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 612 "ignored.\n", m->m_pkthdr.len)); 613 return EINVAL; 614 } 615 error = ipsec6_setspidx_ipaddr(m, spidx); 616 if (error) 617 return error; 618 ipsec6_get_ulp(m, spidx, needport); 619 return 0; 620 #endif 621 default: 622 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 623 printf("ipsec_setspidx: " 624 "unknown IP version %u, ignored.\n", v)); 625 return EINVAL; 626 } 627 } 628 629 static void 630 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 631 { 632 u_int8_t nxt; 633 int off; 634 635 /* sanity check */ 636 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 637 KASSERT(m->m_pkthdr.len >= sizeof(struct ip), 638 ("ipsec4_get_ulp: packet too short")); 639 640 /* NB: ip_input() flips it into host endian XXX need more checking */ 641 if (m->m_len < sizeof (struct ip)) { 642 struct ip *ip = mtod(m, struct ip *); 643 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 644 goto done; 645 #ifdef _IP_VHL 646 off = _IP_VHL_HL(ip->ip_vhl) << 2; 647 #else 648 off = ip->ip_hl << 2; 649 #endif 650 nxt = ip->ip_p; 651 } else { 652 struct ip ih; 653 654 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 655 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 656 goto done; 657 #ifdef _IP_VHL 658 off = _IP_VHL_HL(ih.ip_vhl) << 2; 659 #else 660 off = ih.ip_hl << 2; 661 #endif 662 nxt = ih.ip_p; 663 } 664 665 while (off < m->m_pkthdr.len) { 666 struct ip6_ext ip6e; 667 struct tcphdr th; 668 struct udphdr uh; 669 670 switch (nxt) { 671 case IPPROTO_TCP: 672 spidx->ul_proto = nxt; 673 if (!needport) 674 goto done_proto; 675 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 676 goto done; 677 m_copydata(m, off, sizeof (th), (caddr_t) &th); 678 spidx->src.sin.sin_port = th.th_sport; 679 spidx->dst.sin.sin_port = th.th_dport; 680 return; 681 case IPPROTO_UDP: 682 spidx->ul_proto = nxt; 683 if (!needport) 684 goto done_proto; 685 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 686 goto done; 687 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 688 spidx->src.sin.sin_port = uh.uh_sport; 689 spidx->dst.sin.sin_port = uh.uh_dport; 690 return; 691 case IPPROTO_AH: 692 if (m->m_pkthdr.len > off + sizeof(ip6e)) 693 goto done; 694 /* XXX sigh, this works but is totally bogus */ 695 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 696 off += (ip6e.ip6e_len + 2) << 2; 697 nxt = ip6e.ip6e_nxt; 698 break; 699 case IPPROTO_ICMP: 700 default: 701 /* XXX intermediate headers??? */ 702 spidx->ul_proto = nxt; 703 goto done_proto; 704 } 705 } 706 done: 707 spidx->ul_proto = IPSEC_ULPROTO_ANY; 708 done_proto: 709 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 710 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 711 } 712 713 /* assumes that m is sane */ 714 static int 715 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 716 { 717 static const struct sockaddr_in template = { 718 sizeof (struct sockaddr_in), 719 AF_INET, 720 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 721 }; 722 723 spidx->src.sin = template; 724 spidx->dst.sin = template; 725 726 if (m->m_len < sizeof (struct ip)) { 727 m_copydata(m, offsetof(struct ip, ip_src), 728 sizeof (struct in_addr), 729 (caddr_t) &spidx->src.sin.sin_addr); 730 m_copydata(m, offsetof(struct ip, ip_dst), 731 sizeof (struct in_addr), 732 (caddr_t) &spidx->dst.sin.sin_addr); 733 } else { 734 struct ip *ip = mtod(m, struct ip *); 735 spidx->src.sin.sin_addr = ip->ip_src; 736 spidx->dst.sin.sin_addr = ip->ip_dst; 737 } 738 739 spidx->prefs = sizeof(struct in_addr) << 3; 740 spidx->prefd = sizeof(struct in_addr) << 3; 741 742 return 0; 743 } 744 745 #ifdef INET6 746 static void 747 ipsec6_get_ulp(m, spidx, needport) 748 struct mbuf *m; 749 struct secpolicyindex *spidx; 750 int needport; 751 { 752 int off, nxt; 753 struct tcphdr th; 754 struct udphdr uh; 755 756 /* sanity check */ 757 if (m == NULL) 758 panic("ipsec6_get_ulp: NULL pointer was passed.\n"); 759 760 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 761 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 762 763 /* set default */ 764 spidx->ul_proto = IPSEC_ULPROTO_ANY; 765 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 766 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 767 768 nxt = -1; 769 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 770 if (off < 0 || m->m_pkthdr.len < off) 771 return; 772 773 switch (nxt) { 774 case IPPROTO_TCP: 775 spidx->ul_proto = nxt; 776 if (!needport) 777 break; 778 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 779 break; 780 m_copydata(m, off, sizeof(th), (caddr_t)&th); 781 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 782 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 783 break; 784 case IPPROTO_UDP: 785 spidx->ul_proto = nxt; 786 if (!needport) 787 break; 788 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 789 break; 790 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 791 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 792 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 793 break; 794 case IPPROTO_ICMPV6: 795 default: 796 /* XXX intermediate headers??? */ 797 spidx->ul_proto = nxt; 798 break; 799 } 800 } 801 802 /* assumes that m is sane */ 803 static int 804 ipsec6_setspidx_ipaddr(m, spidx) 805 struct mbuf *m; 806 struct secpolicyindex *spidx; 807 { 808 struct ip6_hdr *ip6 = NULL; 809 struct ip6_hdr ip6buf; 810 struct sockaddr_in6 *sin6; 811 812 if (m->m_len >= sizeof(*ip6)) 813 ip6 = mtod(m, struct ip6_hdr *); 814 else { 815 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 816 ip6 = &ip6buf; 817 } 818 819 sin6 = (struct sockaddr_in6 *)&spidx->src; 820 bzero(sin6, sizeof(*sin6)); 821 sin6->sin6_family = AF_INET6; 822 sin6->sin6_len = sizeof(struct sockaddr_in6); 823 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 824 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 825 sin6->sin6_addr.s6_addr16[1] = 0; 826 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 827 } 828 spidx->prefs = sizeof(struct in6_addr) << 3; 829 830 sin6 = (struct sockaddr_in6 *)&spidx->dst; 831 bzero(sin6, sizeof(*sin6)); 832 sin6->sin6_family = AF_INET6; 833 sin6->sin6_len = sizeof(struct sockaddr_in6); 834 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 835 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 836 sin6->sin6_addr.s6_addr16[1] = 0; 837 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 838 } 839 spidx->prefd = sizeof(struct in6_addr) << 3; 840 841 return 0; 842 } 843 #endif 844 845 static void 846 ipsec_delpcbpolicy(p) 847 struct inpcbpolicy *p; 848 { 849 free(p, M_SECA); 850 } 851 852 /* initialize policy in PCB */ 853 int 854 ipsec_init_policy(so, pcb_sp) 855 struct socket *so; 856 struct inpcbpolicy **pcb_sp; 857 { 858 struct inpcbpolicy *new; 859 860 /* sanity check. */ 861 if (so == NULL || pcb_sp == NULL) 862 panic("ipsec_init_policy: NULL pointer was passed.\n"); 863 864 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 865 M_SECA, M_NOWAIT|M_ZERO); 866 if (new == NULL) { 867 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 868 return ENOBUFS; 869 } 870 871 if (so->so_cred != 0 && so->so_cred->cr_uid == 0) 872 new->priv = 1; 873 else 874 new->priv = 0; 875 876 if ((new->sp_in = KEY_NEWSP()) == NULL) { 877 ipsec_delpcbpolicy(new); 878 return ENOBUFS; 879 } 880 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 881 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 882 883 if ((new->sp_out = KEY_NEWSP()) == NULL) { 884 KEY_FREESP(&new->sp_in); 885 ipsec_delpcbpolicy(new); 886 return ENOBUFS; 887 } 888 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 889 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 890 891 *pcb_sp = new; 892 893 return 0; 894 } 895 896 /* copy old ipsec policy into new */ 897 int 898 ipsec_copy_policy(old, new) 899 struct inpcbpolicy *old, *new; 900 { 901 struct secpolicy *sp; 902 903 sp = ipsec_deepcopy_policy(old->sp_in); 904 if (sp) { 905 KEY_FREESP(&new->sp_in); 906 new->sp_in = sp; 907 } else 908 return ENOBUFS; 909 910 sp = ipsec_deepcopy_policy(old->sp_out); 911 if (sp) { 912 KEY_FREESP(&new->sp_out); 913 new->sp_out = sp; 914 } else 915 return ENOBUFS; 916 917 new->priv = old->priv; 918 919 return 0; 920 } 921 922 /* deep-copy a policy in PCB */ 923 static struct secpolicy * 924 ipsec_deepcopy_policy(src) 925 struct secpolicy *src; 926 { 927 struct ipsecrequest *newchain = NULL; 928 struct ipsecrequest *p; 929 struct ipsecrequest **q; 930 struct ipsecrequest *r; 931 struct secpolicy *dst; 932 933 if (src == NULL) 934 return NULL; 935 dst = KEY_NEWSP(); 936 if (dst == NULL) 937 return NULL; 938 939 /* 940 * deep-copy IPsec request chain. This is required since struct 941 * ipsecrequest is not reference counted. 942 */ 943 q = &newchain; 944 for (p = src->req; p; p = p->next) { 945 *q = (struct ipsecrequest *)malloc(sizeof(struct ipsecrequest), 946 M_SECA, M_NOWAIT); 947 if (*q == NULL) 948 goto fail; 949 bzero(*q, sizeof(**q)); 950 (*q)->next = NULL; 951 952 (*q)->saidx.proto = p->saidx.proto; 953 (*q)->saidx.mode = p->saidx.mode; 954 (*q)->level = p->level; 955 (*q)->saidx.reqid = p->saidx.reqid; 956 957 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 958 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 959 960 (*q)->sav = NULL; 961 (*q)->sp = dst; 962 963 q = &((*q)->next); 964 } 965 966 dst->req = newchain; 967 dst->state = src->state; 968 dst->policy = src->policy; 969 /* do not touch the refcnt fields */ 970 971 return dst; 972 973 fail: 974 for (p = newchain; p; p = r) { 975 r = p->next; 976 free(p, M_SECA); 977 p = NULL; 978 } 979 return NULL; 980 } 981 982 /* set policy and ipsec request if present. */ 983 static int 984 ipsec_set_policy(pcb_sp, optname, request, len, priv) 985 struct secpolicy **pcb_sp; 986 int optname; 987 caddr_t request; 988 size_t len; 989 int priv; 990 { 991 struct sadb_x_policy *xpl; 992 struct secpolicy *newsp = NULL; 993 int error; 994 995 /* sanity check. */ 996 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 997 return EINVAL; 998 if (len < sizeof(*xpl)) 999 return EINVAL; 1000 xpl = (struct sadb_x_policy *)request; 1001 1002 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1003 printf("ipsec_set_policy: passed policy\n"); 1004 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1005 1006 /* check policy type */ 1007 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1008 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1009 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1010 return EINVAL; 1011 1012 /* check privileged socket */ 1013 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1014 return EACCES; 1015 1016 /* allocation new SP entry */ 1017 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1018 return error; 1019 1020 newsp->state = IPSEC_SPSTATE_ALIVE; 1021 1022 /* clear old SP and set new SP */ 1023 KEY_FREESP(pcb_sp); 1024 *pcb_sp = newsp; 1025 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1026 printf("ipsec_set_policy: new policy\n"); 1027 kdebug_secpolicy(newsp)); 1028 1029 return 0; 1030 } 1031 1032 static int 1033 ipsec_get_policy(pcb_sp, mp) 1034 struct secpolicy *pcb_sp; 1035 struct mbuf **mp; 1036 { 1037 1038 /* sanity check. */ 1039 if (pcb_sp == NULL || mp == NULL) 1040 return EINVAL; 1041 1042 *mp = key_sp2msg(pcb_sp); 1043 if (!*mp) { 1044 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1045 return ENOBUFS; 1046 } 1047 1048 (*mp)->m_type = MT_DATA; 1049 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1050 printf("ipsec_get_policy:\n"); 1051 kdebug_mbuf(*mp)); 1052 1053 return 0; 1054 } 1055 1056 int 1057 ipsec4_set_policy(inp, optname, request, len, priv) 1058 struct inpcb *inp; 1059 int optname; 1060 caddr_t request; 1061 size_t len; 1062 int priv; 1063 { 1064 struct sadb_x_policy *xpl; 1065 struct secpolicy **pcb_sp; 1066 1067 /* sanity check. */ 1068 if (inp == NULL || request == NULL) 1069 return EINVAL; 1070 if (len < sizeof(*xpl)) 1071 return EINVAL; 1072 xpl = (struct sadb_x_policy *)request; 1073 1074 /* select direction */ 1075 switch (xpl->sadb_x_policy_dir) { 1076 case IPSEC_DIR_INBOUND: 1077 pcb_sp = &inp->inp_sp->sp_in; 1078 break; 1079 case IPSEC_DIR_OUTBOUND: 1080 pcb_sp = &inp->inp_sp->sp_out; 1081 break; 1082 default: 1083 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1084 xpl->sadb_x_policy_dir)); 1085 return EINVAL; 1086 } 1087 1088 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1089 } 1090 1091 int 1092 ipsec4_get_policy(inp, request, len, mp) 1093 struct inpcb *inp; 1094 caddr_t request; 1095 size_t len; 1096 struct mbuf **mp; 1097 { 1098 struct sadb_x_policy *xpl; 1099 struct secpolicy *pcb_sp; 1100 1101 /* sanity check. */ 1102 if (inp == NULL || request == NULL || mp == NULL) 1103 return EINVAL; 1104 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1105 if (len < sizeof(*xpl)) 1106 return EINVAL; 1107 xpl = (struct sadb_x_policy *)request; 1108 1109 /* select direction */ 1110 switch (xpl->sadb_x_policy_dir) { 1111 case IPSEC_DIR_INBOUND: 1112 pcb_sp = inp->inp_sp->sp_in; 1113 break; 1114 case IPSEC_DIR_OUTBOUND: 1115 pcb_sp = inp->inp_sp->sp_out; 1116 break; 1117 default: 1118 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1119 xpl->sadb_x_policy_dir)); 1120 return EINVAL; 1121 } 1122 1123 return ipsec_get_policy(pcb_sp, mp); 1124 } 1125 1126 /* delete policy in PCB */ 1127 int 1128 ipsec4_delete_pcbpolicy(inp) 1129 struct inpcb *inp; 1130 { 1131 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1132 1133 if (inp->inp_sp == NULL) 1134 return 0; 1135 1136 if (inp->inp_sp->sp_in != NULL) 1137 KEY_FREESP(&inp->inp_sp->sp_in); 1138 1139 if (inp->inp_sp->sp_out != NULL) 1140 KEY_FREESP(&inp->inp_sp->sp_out); 1141 1142 ipsec_delpcbpolicy(inp->inp_sp); 1143 inp->inp_sp = NULL; 1144 1145 return 0; 1146 } 1147 1148 #ifdef INET6 1149 int 1150 ipsec6_set_policy(in6p, optname, request, len, priv) 1151 struct in6pcb *in6p; 1152 int optname; 1153 caddr_t request; 1154 size_t len; 1155 int priv; 1156 { 1157 struct sadb_x_policy *xpl; 1158 struct secpolicy **pcb_sp; 1159 1160 /* sanity check. */ 1161 if (in6p == NULL || request == NULL) 1162 return EINVAL; 1163 if (len < sizeof(*xpl)) 1164 return EINVAL; 1165 xpl = (struct sadb_x_policy *)request; 1166 1167 /* select direction */ 1168 switch (xpl->sadb_x_policy_dir) { 1169 case IPSEC_DIR_INBOUND: 1170 pcb_sp = &in6p->in6p_sp->sp_in; 1171 break; 1172 case IPSEC_DIR_OUTBOUND: 1173 pcb_sp = &in6p->in6p_sp->sp_out; 1174 break; 1175 default: 1176 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1177 xpl->sadb_x_policy_dir)); 1178 return EINVAL; 1179 } 1180 1181 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1182 } 1183 1184 int 1185 ipsec6_get_policy(in6p, request, len, mp) 1186 struct in6pcb *in6p; 1187 caddr_t request; 1188 size_t len; 1189 struct mbuf **mp; 1190 { 1191 struct sadb_x_policy *xpl; 1192 struct secpolicy *pcb_sp; 1193 1194 /* sanity check. */ 1195 if (in6p == NULL || request == NULL || mp == NULL) 1196 return EINVAL; 1197 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1198 if (len < sizeof(*xpl)) 1199 return EINVAL; 1200 xpl = (struct sadb_x_policy *)request; 1201 1202 /* select direction */ 1203 switch (xpl->sadb_x_policy_dir) { 1204 case IPSEC_DIR_INBOUND: 1205 pcb_sp = in6p->in6p_sp->sp_in; 1206 break; 1207 case IPSEC_DIR_OUTBOUND: 1208 pcb_sp = in6p->in6p_sp->sp_out; 1209 break; 1210 default: 1211 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1212 xpl->sadb_x_policy_dir)); 1213 return EINVAL; 1214 } 1215 1216 return ipsec_get_policy(pcb_sp, mp); 1217 } 1218 1219 int 1220 ipsec6_delete_pcbpolicy(in6p) 1221 struct in6pcb *in6p; 1222 { 1223 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1224 1225 if (in6p->in6p_sp == NULL) 1226 return 0; 1227 1228 if (in6p->in6p_sp->sp_in != NULL) 1229 KEY_FREESP(&in6p->in6p_sp->sp_in); 1230 1231 if (in6p->in6p_sp->sp_out != NULL) 1232 KEY_FREESP(&in6p->in6p_sp->sp_out); 1233 1234 ipsec_delpcbpolicy(in6p->in6p_sp); 1235 in6p->in6p_sp = NULL; 1236 1237 return 0; 1238 } 1239 #endif 1240 1241 /* 1242 * return current level. 1243 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1244 */ 1245 u_int 1246 ipsec_get_reqlevel(isr) 1247 struct ipsecrequest *isr; 1248 { 1249 u_int level = 0; 1250 u_int esp_trans_deflev, esp_net_deflev; 1251 u_int ah_trans_deflev, ah_net_deflev; 1252 1253 KASSERT(isr != NULL && isr->sp != NULL, 1254 ("ipsec_get_reqlevel: null argument")); 1255 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1256 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1257 isr->sp->spidx.src.sa.sa_family, 1258 isr->sp->spidx.dst.sa.sa_family)); 1259 1260 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1261 #define IPSEC_CHECK_DEFAULT(lev) \ 1262 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1263 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1264 ? (ipsec_debug \ 1265 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1266 (lev), IPSEC_LEVEL_REQUIRE) \ 1267 : 0), \ 1268 (lev) = IPSEC_LEVEL_REQUIRE, \ 1269 (lev) \ 1270 : (lev)) 1271 1272 /* set default level */ 1273 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1274 #ifdef INET 1275 case AF_INET: 1276 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1277 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1278 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1279 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1280 break; 1281 #endif 1282 #ifdef INET6 1283 case AF_INET6: 1284 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1285 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1286 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1287 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1288 break; 1289 #endif /* INET6 */ 1290 default: 1291 panic("key_get_reqlevel: unknown af %u", 1292 isr->sp->spidx.src.sa.sa_family); 1293 } 1294 1295 #undef IPSEC_CHECK_DEFAULT 1296 1297 /* set level */ 1298 switch (isr->level) { 1299 case IPSEC_LEVEL_DEFAULT: 1300 switch (isr->saidx.proto) { 1301 case IPPROTO_ESP: 1302 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1303 level = esp_net_deflev; 1304 else 1305 level = esp_trans_deflev; 1306 break; 1307 case IPPROTO_AH: 1308 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1309 level = ah_net_deflev; 1310 else 1311 level = ah_trans_deflev; 1312 case IPPROTO_IPCOMP: 1313 /* 1314 * we don't really care, as IPcomp document says that 1315 * we shouldn't compress small packets 1316 */ 1317 level = IPSEC_LEVEL_USE; 1318 break; 1319 default: 1320 panic("ipsec_get_reqlevel: " 1321 "Illegal protocol defined %u\n", 1322 isr->saidx.proto); 1323 } 1324 break; 1325 1326 case IPSEC_LEVEL_USE: 1327 case IPSEC_LEVEL_REQUIRE: 1328 level = isr->level; 1329 break; 1330 case IPSEC_LEVEL_UNIQUE: 1331 level = IPSEC_LEVEL_REQUIRE; 1332 break; 1333 1334 default: 1335 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n", 1336 isr->level); 1337 } 1338 1339 return level; 1340 } 1341 1342 /* 1343 * Check security policy requirements against the actual 1344 * packet contents. Return one if the packet should be 1345 * reject as "invalid"; otherwiser return zero to have the 1346 * packet treated as "valid". 1347 * 1348 * OUT: 1349 * 0: valid 1350 * 1: invalid 1351 */ 1352 int 1353 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1354 { 1355 struct ipsecrequest *isr; 1356 int need_auth; 1357 1358 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1359 printf("ipsec_in_reject: using SP\n"); 1360 kdebug_secpolicy(sp)); 1361 1362 /* check policy */ 1363 switch (sp->policy) { 1364 case IPSEC_POLICY_DISCARD: 1365 return 1; 1366 case IPSEC_POLICY_BYPASS: 1367 case IPSEC_POLICY_NONE: 1368 return 0; 1369 } 1370 1371 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1372 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1373 1374 /* XXX should compare policy against ipsec header history */ 1375 1376 need_auth = 0; 1377 for (isr = sp->req; isr != NULL; isr = isr->next) { 1378 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1379 continue; 1380 switch (isr->saidx.proto) { 1381 case IPPROTO_ESP: 1382 if ((m->m_flags & M_DECRYPTED) == 0) { 1383 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1384 printf("ipsec_in_reject: ESP m_flags:%x\n", 1385 m->m_flags)); 1386 return 1; 1387 } 1388 1389 if (!need_auth && 1390 isr->sav != NULL && 1391 isr->sav->tdb_authalgxform != NULL && 1392 (m->m_flags & M_AUTHIPDGM) == 0) { 1393 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1394 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1395 m->m_flags)); 1396 return 1; 1397 } 1398 break; 1399 case IPPROTO_AH: 1400 need_auth = 1; 1401 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1402 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1403 printf("ipsec_in_reject: AH m_flags:%x\n", 1404 m->m_flags)); 1405 return 1; 1406 } 1407 break; 1408 case IPPROTO_IPCOMP: 1409 /* 1410 * we don't really care, as IPcomp document 1411 * says that we shouldn't compress small 1412 * packets, IPComp policy should always be 1413 * treated as being in "use" level. 1414 */ 1415 break; 1416 } 1417 } 1418 return 0; /* valid */ 1419 } 1420 1421 /* 1422 * Check AH/ESP integrity. 1423 * This function is called from tcp_input(), udp_input(), 1424 * and {ah,esp}4_input for tunnel mode 1425 */ 1426 int 1427 ipsec4_in_reject(m, inp) 1428 struct mbuf *m; 1429 struct inpcb *inp; 1430 { 1431 struct secpolicy *sp; 1432 int error; 1433 int result; 1434 1435 KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1436 1437 /* get SP for this packet. 1438 * When we are called from ip_forward(), we call 1439 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1440 */ 1441 if (inp == NULL) 1442 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1443 else 1444 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1445 1446 if (sp != NULL) { 1447 result = ipsec_in_reject(sp, m); 1448 if (result) 1449 newipsecstat.ips_in_polvio++; 1450 KEY_FREESP(&sp); 1451 } else { 1452 result = 0; /* XXX should be panic ? 1453 * -> No, there may be error. */ 1454 } 1455 return result; 1456 } 1457 1458 #ifdef INET6 1459 /* 1460 * Check AH/ESP integrity. 1461 * This function is called from tcp6_input(), udp6_input(), 1462 * and {ah,esp}6_input for tunnel mode 1463 */ 1464 int 1465 ipsec6_in_reject(m, inp) 1466 struct mbuf *m; 1467 struct inpcb *inp; 1468 { 1469 struct secpolicy *sp = NULL; 1470 int error; 1471 int result; 1472 1473 /* sanity check */ 1474 if (m == NULL) 1475 return 0; /* XXX should be panic ? */ 1476 1477 /* get SP for this packet. 1478 * When we are called from ip_forward(), we call 1479 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1480 */ 1481 if (inp == NULL) 1482 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1483 else 1484 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1485 1486 if (sp != NULL) { 1487 result = ipsec_in_reject(sp, m); 1488 if (result) 1489 newipsecstat.ips_in_polvio++; 1490 KEY_FREESP(&sp); 1491 } else { 1492 result = 0; 1493 } 1494 return result; 1495 } 1496 #endif 1497 1498 /* 1499 * compute the byte size to be occupied by IPsec header. 1500 * in case it is tunneled, it includes the size of outer IP header. 1501 * NOTE: SP passed is free in this function. 1502 */ 1503 static size_t 1504 ipsec_hdrsiz(struct secpolicy *sp) 1505 { 1506 struct ipsecrequest *isr; 1507 size_t siz; 1508 1509 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1510 printf("ipsec_hdrsiz: using SP\n"); 1511 kdebug_secpolicy(sp)); 1512 1513 switch (sp->policy) { 1514 case IPSEC_POLICY_DISCARD: 1515 case IPSEC_POLICY_BYPASS: 1516 case IPSEC_POLICY_NONE: 1517 return 0; 1518 } 1519 1520 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1521 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1522 1523 siz = 0; 1524 for (isr = sp->req; isr != NULL; isr = isr->next) { 1525 size_t clen = 0; 1526 1527 switch (isr->saidx.proto) { 1528 case IPPROTO_ESP: 1529 clen = esp_hdrsiz(isr->sav); 1530 break; 1531 case IPPROTO_AH: 1532 clen = ah_hdrsiz(isr->sav); 1533 break; 1534 case IPPROTO_IPCOMP: 1535 clen = sizeof(struct ipcomp); 1536 break; 1537 } 1538 1539 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1540 switch (isr->saidx.dst.sa.sa_family) { 1541 case AF_INET: 1542 clen += sizeof(struct ip); 1543 break; 1544 #ifdef INET6 1545 case AF_INET6: 1546 clen += sizeof(struct ip6_hdr); 1547 break; 1548 #endif 1549 default: 1550 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1551 "unknown AF %d in IPsec tunnel SA\n", 1552 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1553 break; 1554 } 1555 } 1556 siz += clen; 1557 } 1558 1559 return siz; 1560 } 1561 1562 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1563 size_t 1564 ipsec4_hdrsiz(m, dir, inp) 1565 struct mbuf *m; 1566 u_int dir; 1567 struct inpcb *inp; 1568 { 1569 struct secpolicy *sp; 1570 int error; 1571 size_t size; 1572 1573 KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1574 KASSERT(inp == NULL || inp->inp_socket != NULL, 1575 ("ipsec4_hdrsize: socket w/o inpcb")); 1576 1577 /* get SP for this packet. 1578 * When we are called from ip_forward(), we call 1579 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1580 */ 1581 if (inp == NULL) 1582 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1583 else 1584 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1585 1586 if (sp != NULL) { 1587 size = ipsec_hdrsiz(sp); 1588 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1589 printf("ipsec4_hdrsiz: size:%lu.\n", 1590 (unsigned long)size)); 1591 1592 KEY_FREESP(&sp); 1593 } else { 1594 size = 0; /* XXX should be panic ? */ 1595 } 1596 return size; 1597 } 1598 1599 #ifdef INET6 1600 /* This function is called from ipsec6_hdrsize_tcp(), 1601 * and maybe from ip6_forward.() 1602 */ 1603 size_t 1604 ipsec6_hdrsiz(m, dir, in6p) 1605 struct mbuf *m; 1606 u_int dir; 1607 struct in6pcb *in6p; 1608 { 1609 struct secpolicy *sp; 1610 int error; 1611 size_t size; 1612 1613 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1614 KASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1615 ("ipsec6_hdrsize: socket w/o inpcb")); 1616 1617 /* get SP for this packet */ 1618 /* XXX Is it right to call with IP_FORWARDING. */ 1619 if (in6p == NULL) 1620 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1621 else 1622 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1623 1624 if (sp == NULL) 1625 return 0; 1626 size = ipsec_hdrsiz(sp); 1627 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1628 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1629 KEY_FREESP(&sp); 1630 1631 return size; 1632 } 1633 #endif /*INET6*/ 1634 1635 /* 1636 * Check the variable replay window. 1637 * ipsec_chkreplay() performs replay check before ICV verification. 1638 * ipsec_updatereplay() updates replay bitmap. This must be called after 1639 * ICV verification (it also performs replay check, which is usually done 1640 * beforehand). 1641 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1642 * 1643 * based on RFC 2401. 1644 */ 1645 int 1646 ipsec_chkreplay(seq, sav) 1647 u_int32_t seq; 1648 struct secasvar *sav; 1649 { 1650 const struct secreplay *replay; 1651 u_int32_t diff; 1652 int fr; 1653 u_int32_t wsizeb; /* constant: bits of window size */ 1654 int frlast; /* constant: last frame */ 1655 1656 SPLASSERT(net, "ipsec_chkreplay"); 1657 1658 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1659 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1660 1661 replay = sav->replay; 1662 1663 if (replay->wsize == 0) 1664 return 1; /* no need to check replay. */ 1665 1666 /* constant */ 1667 frlast = replay->wsize - 1; 1668 wsizeb = replay->wsize << 3; 1669 1670 /* sequence number of 0 is invalid */ 1671 if (seq == 0) 1672 return 0; 1673 1674 /* first time is always okay */ 1675 if (replay->count == 0) 1676 return 1; 1677 1678 if (seq > replay->lastseq) { 1679 /* larger sequences are okay */ 1680 return 1; 1681 } else { 1682 /* seq is equal or less than lastseq. */ 1683 diff = replay->lastseq - seq; 1684 1685 /* over range to check, i.e. too old or wrapped */ 1686 if (diff >= wsizeb) 1687 return 0; 1688 1689 fr = frlast - diff / 8; 1690 1691 /* this packet already seen ? */ 1692 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1693 return 0; 1694 1695 /* out of order but good */ 1696 return 1; 1697 } 1698 } 1699 1700 /* 1701 * check replay counter whether to update or not. 1702 * OUT: 0: OK 1703 * 1: NG 1704 */ 1705 int 1706 ipsec_updatereplay(seq, sav) 1707 u_int32_t seq; 1708 struct secasvar *sav; 1709 { 1710 struct secreplay *replay; 1711 u_int32_t diff; 1712 int fr; 1713 u_int32_t wsizeb; /* constant: bits of window size */ 1714 int frlast; /* constant: last frame */ 1715 1716 SPLASSERT(net, "ipsec_updatereplay"); 1717 1718 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1719 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1720 1721 replay = sav->replay; 1722 1723 if (replay->wsize == 0) 1724 goto ok; /* no need to check replay. */ 1725 1726 /* constant */ 1727 frlast = replay->wsize - 1; 1728 wsizeb = replay->wsize << 3; 1729 1730 /* sequence number of 0 is invalid */ 1731 if (seq == 0) 1732 return 1; 1733 1734 /* first time */ 1735 if (replay->count == 0) { 1736 replay->lastseq = seq; 1737 bzero(replay->bitmap, replay->wsize); 1738 (replay->bitmap)[frlast] = 1; 1739 goto ok; 1740 } 1741 1742 if (seq > replay->lastseq) { 1743 /* seq is larger than lastseq. */ 1744 diff = seq - replay->lastseq; 1745 1746 /* new larger sequence number */ 1747 if (diff < wsizeb) { 1748 /* In window */ 1749 /* set bit for this packet */ 1750 vshiftl(replay->bitmap, diff, replay->wsize); 1751 (replay->bitmap)[frlast] |= 1; 1752 } else { 1753 /* this packet has a "way larger" */ 1754 bzero(replay->bitmap, replay->wsize); 1755 (replay->bitmap)[frlast] = 1; 1756 } 1757 replay->lastseq = seq; 1758 1759 /* larger is good */ 1760 } else { 1761 /* seq is equal or less than lastseq. */ 1762 diff = replay->lastseq - seq; 1763 1764 /* over range to check, i.e. too old or wrapped */ 1765 if (diff >= wsizeb) 1766 return 1; 1767 1768 fr = frlast - diff / 8; 1769 1770 /* this packet already seen ? */ 1771 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1772 return 1; 1773 1774 /* mark as seen */ 1775 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1776 1777 /* out of order but good */ 1778 } 1779 1780 ok: 1781 if (replay->count == ~0) { 1782 1783 /* set overflow flag */ 1784 replay->overflow++; 1785 1786 /* don't increment, no more packets accepted */ 1787 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1788 return 1; 1789 1790 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 1791 replay->overflow, ipsec_logsastr(sav))); 1792 } 1793 1794 replay->count++; 1795 1796 return 0; 1797 } 1798 1799 /* 1800 * shift variable length bunffer to left. 1801 * IN: bitmap: pointer to the buffer 1802 * nbit: the number of to shift. 1803 * wsize: buffer size (bytes). 1804 */ 1805 static void 1806 vshiftl(bitmap, nbit, wsize) 1807 unsigned char *bitmap; 1808 int nbit, wsize; 1809 { 1810 int s, j, i; 1811 unsigned char over; 1812 1813 for (j = 0; j < nbit; j += 8) { 1814 s = (nbit - j < 8) ? (nbit - j): 8; 1815 bitmap[0] <<= s; 1816 for (i = 1; i < wsize; i++) { 1817 over = (bitmap[i] >> (8 - s)); 1818 bitmap[i] <<= s; 1819 bitmap[i-1] |= over; 1820 } 1821 } 1822 1823 return; 1824 } 1825 1826 /* Return a printable string for the IPv4 address. */ 1827 static char * 1828 inet_ntoa4(struct in_addr ina) 1829 { 1830 static char buf[4][4 * sizeof "123" + 4]; 1831 unsigned char *ucp = (unsigned char *) &ina; 1832 static int i = 3; 1833 1834 i = (i + 1) % 4; 1835 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1836 ucp[2] & 0xff, ucp[3] & 0xff); 1837 return (buf[i]); 1838 } 1839 1840 /* Return a printable string for the address. */ 1841 char * 1842 ipsec_address(union sockaddr_union* sa) 1843 { 1844 switch (sa->sa.sa_family) { 1845 #if INET 1846 case AF_INET: 1847 return inet_ntoa4(sa->sin.sin_addr); 1848 #endif /* INET */ 1849 1850 #if INET6 1851 case AF_INET6: 1852 return ip6_sprintf(&sa->sin6.sin6_addr); 1853 #endif /* INET6 */ 1854 1855 default: 1856 return "(unknown address family)"; 1857 } 1858 } 1859 1860 const char * 1861 ipsec_logsastr(sav) 1862 struct secasvar *sav; 1863 { 1864 static char buf[256]; 1865 char *p; 1866 struct secasindex *saidx = &sav->sah->saidx; 1867 1868 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1869 ("ipsec_logsastr: address family mismatch")); 1870 1871 p = buf; 1872 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1873 while (p && *p) 1874 p++; 1875 /* NB: only use ipsec_address on one address at a time */ 1876 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1877 ipsec_address(&saidx->src)); 1878 while (p && *p) 1879 p++; 1880 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1881 ipsec_address(&saidx->dst)); 1882 1883 return buf; 1884 } 1885 1886 void 1887 ipsec_dumpmbuf(m) 1888 struct mbuf *m; 1889 { 1890 int totlen; 1891 int i; 1892 u_char *p; 1893 1894 totlen = 0; 1895 printf("---\n"); 1896 while (m) { 1897 p = mtod(m, u_char *); 1898 for (i = 0; i < m->m_len; i++) { 1899 printf("%02x ", p[i]); 1900 totlen++; 1901 if (totlen % 16 == 0) 1902 printf("\n"); 1903 } 1904 m = m->m_next; 1905 } 1906 if (totlen % 16 != 0) 1907 printf("\n"); 1908 printf("---\n"); 1909 } 1910 1911 /* XXX this stuff doesn't belong here... */ 1912 1913 static struct xformsw* xforms = NULL; 1914 1915 /* 1916 * Register a transform; typically at system startup. 1917 */ 1918 void 1919 xform_register(struct xformsw* xsp) 1920 { 1921 xsp->xf_next = xforms; 1922 xforms = xsp; 1923 } 1924 1925 /* 1926 * Initialize transform support in an sav. 1927 */ 1928 int 1929 xform_init(struct secasvar *sav, int xftype) 1930 { 1931 struct xformsw *xsp; 1932 1933 if (sav->tdb_xform != NULL) /* previously initialized */ 1934 return 0; 1935 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1936 if (xsp->xf_type == xftype) 1937 return (*xsp->xf_init)(sav, xsp); 1938 return EINVAL; 1939 }
Cache object: dd058c19b7951ecd356c76fd0d8c3379
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