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 MALLOC_DEFINE(M_IPSEC_INPCB, "inpcbpolicy", "inpcb-resident ipsec policy"); 206 207 /* 208 * Return a held reference to the default SP. 209 */ 210 static struct secpolicy * 211 key_allocsp_default(const char* where, int tag) 212 { 213 struct secpolicy *sp; 214 215 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 216 printf("DP key_allocsp_default from %s:%u\n", where, tag)); 217 218 sp = &ip4_def_policy; 219 if (sp->policy != IPSEC_POLICY_DISCARD && 220 sp->policy != IPSEC_POLICY_NONE) { 221 ipseclog((LOG_INFO, "fixed system default policy: %d->%d\n", 222 sp->policy, IPSEC_POLICY_NONE)); 223 sp->policy = IPSEC_POLICY_NONE; 224 } 225 sp->refcnt++; 226 227 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 228 printf("DP key_allocsp_default returns SP:%p (%u)\n", 229 sp, sp->refcnt)); 230 return sp; 231 } 232 #define KEY_ALLOCSP_DEFAULT() \ 233 key_allocsp_default(__FILE__, __LINE__) 234 235 /* 236 * For OUTBOUND packet having a socket. Searching SPD for packet, 237 * and return a pointer to SP. 238 * OUT: NULL: no apropreate SP found, the following value is set to error. 239 * 0 : bypass 240 * EACCES : discard packet. 241 * ENOENT : ipsec_acquire() in progress, maybe. 242 * others : error occured. 243 * others: a pointer to SP 244 * 245 * NOTE: IPv6 mapped adddress concern is implemented here. 246 */ 247 struct secpolicy * 248 ipsec_getpolicy(struct tdb_ident *tdbi, u_int dir) 249 { 250 struct secpolicy *sp; 251 252 KASSERT(tdbi != NULL, ("ipsec_getpolicy: null tdbi")); 253 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 254 ("ipsec_getpolicy: invalid direction %u", dir)); 255 256 sp = KEY_ALLOCSP2(tdbi->spi, &tdbi->dst, tdbi->proto, dir); 257 if (sp == NULL) /*XXX????*/ 258 sp = KEY_ALLOCSP_DEFAULT(); 259 KASSERT(sp != NULL, ("ipsec_getpolicy: null SP")); 260 return sp; 261 } 262 263 /* 264 * For OUTBOUND packet having a socket. Searching SPD for packet, 265 * and return a pointer to SP. 266 * OUT: NULL: no apropreate SP found, the following value is set to error. 267 * 0 : bypass 268 * EACCES : discard packet. 269 * ENOENT : ipsec_acquire() in progress, maybe. 270 * others : error occured. 271 * others: a pointer to SP 272 * 273 * NOTE: IPv6 mapped adddress concern is implemented here. 274 */ 275 struct secpolicy * 276 ipsec_getpolicybysock(m, dir, inp, error) 277 struct mbuf *m; 278 u_int dir; 279 struct inpcb *inp; 280 int *error; 281 { 282 struct inpcbpolicy *pcbsp = NULL; 283 struct secpolicy *currsp = NULL; /* policy on socket */ 284 struct secpolicy *sp; 285 286 KASSERT(m != NULL, ("ipsec_getpolicybysock: null mbuf")); 287 KASSERT(inp != NULL, ("ipsec_getpolicybysock: null inpcb")); 288 KASSERT(error != NULL, ("ipsec_getpolicybysock: null error")); 289 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 290 ("ipsec_getpolicybysock: invalid direction %u", dir)); 291 292 /* set spidx in pcb */ 293 if (inp->inp_vflag & INP_IPV6PROTO) { 294 #ifdef INET6 295 *error = ipsec6_setspidx_in6pcb(m, inp); 296 pcbsp = inp->in6p_sp; 297 #else 298 *error = EINVAL; /* should not happen */ 299 #endif 300 } else { 301 *error = ipsec4_setspidx_inpcb(m, inp); 302 pcbsp = inp->inp_sp; 303 } 304 if (*error) 305 return NULL; 306 307 KASSERT(pcbsp != NULL, ("ipsec_getpolicybysock: null pcbsp")); 308 switch (dir) { 309 case IPSEC_DIR_INBOUND: 310 currsp = pcbsp->sp_in; 311 break; 312 case IPSEC_DIR_OUTBOUND: 313 currsp = pcbsp->sp_out; 314 break; 315 } 316 KASSERT(currsp != NULL, ("ipsec_getpolicybysock: null currsp")); 317 318 if (pcbsp->priv) { /* when privilieged socket */ 319 switch (currsp->policy) { 320 case IPSEC_POLICY_BYPASS: 321 case IPSEC_POLICY_IPSEC: 322 currsp->refcnt++; 323 sp = currsp; 324 break; 325 326 case IPSEC_POLICY_ENTRUST: 327 /* look for a policy in SPD */ 328 sp = KEY_ALLOCSP(&currsp->spidx, dir); 329 if (sp == NULL) /* no SP found */ 330 sp = KEY_ALLOCSP_DEFAULT(); 331 break; 332 333 default: 334 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 335 "Invalid policy for PCB %d\n", currsp->policy)); 336 *error = EINVAL; 337 return NULL; 338 } 339 } else { /* unpriv, SPD has policy */ 340 sp = KEY_ALLOCSP(&currsp->spidx, dir); 341 if (sp == NULL) { /* no SP found */ 342 switch (currsp->policy) { 343 case IPSEC_POLICY_BYPASS: 344 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 345 "Illegal policy for non-priviliged defined %d\n", 346 currsp->policy)); 347 *error = EINVAL; 348 return NULL; 349 350 case IPSEC_POLICY_ENTRUST: 351 sp = KEY_ALLOCSP_DEFAULT(); 352 break; 353 354 case IPSEC_POLICY_IPSEC: 355 currsp->refcnt++; 356 sp = currsp; 357 break; 358 359 default: 360 ipseclog((LOG_ERR, "ipsec_getpolicybysock: " 361 "Invalid policy for PCB %d\n", currsp->policy)); 362 *error = EINVAL; 363 return NULL; 364 } 365 } 366 } 367 KASSERT(sp != NULL, 368 ("ipsec_getpolicybysock: null SP (priv %u policy %u", 369 pcbsp->priv, currsp->policy)); 370 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 371 printf("DP ipsec_getpolicybysock (priv %u policy %u) allocates " 372 "SP:%p (refcnt %u)\n", pcbsp->priv, currsp->policy, 373 sp, sp->refcnt)); 374 return sp; 375 } 376 377 /* 378 * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, 379 * and return a pointer to SP. 380 * OUT: positive: a pointer to the entry for security policy leaf matched. 381 * NULL: no apropreate SP found, the following value is set to error. 382 * 0 : bypass 383 * EACCES : discard packet. 384 * ENOENT : ipsec_acquire() in progress, maybe. 385 * others : error occured. 386 */ 387 struct secpolicy * 388 ipsec_getpolicybyaddr(m, dir, flag, error) 389 struct mbuf *m; 390 u_int dir; 391 int flag; 392 int *error; 393 { 394 struct secpolicyindex spidx; 395 struct secpolicy *sp; 396 397 KASSERT(m != NULL, ("ipsec_getpolicybyaddr: null mbuf")); 398 KASSERT(error != NULL, ("ipsec_getpolicybyaddr: null error")); 399 KASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 400 ("ipsec4_getpolicybaddr: invalid direction %u", dir)); 401 402 sp = NULL; 403 if (key_havesp(dir)) { 404 /* Make an index to look for a policy. */ 405 *error = ipsec_setspidx(m, &spidx, 406 (flag & IP_FORWARDING) ? 0 : 1); 407 if (*error != 0) { 408 DPRINTF(("ipsec_getpolicybyaddr: setpidx failed," 409 " dir %u flag %u\n", dir, flag)); 410 bzero(&spidx, sizeof (spidx)); 411 return NULL; 412 } 413 spidx.dir = dir; 414 415 sp = KEY_ALLOCSP(&spidx, dir); 416 } 417 if (sp == NULL) /* no SP found, use system default */ 418 sp = KEY_ALLOCSP_DEFAULT(); 419 KASSERT(sp != NULL, ("ipsec_getpolicybyaddr: null SP")); 420 return sp; 421 } 422 423 struct secpolicy * 424 ipsec4_checkpolicy(m, dir, flag, error, inp) 425 struct mbuf *m; 426 u_int dir, flag; 427 int *error; 428 struct inpcb *inp; 429 { 430 struct secpolicy *sp; 431 432 *error = 0; 433 if (inp == NULL) 434 sp = ipsec_getpolicybyaddr(m, dir, flag, error); 435 else 436 sp = ipsec_getpolicybysock(m, dir, inp, error); 437 if (sp == NULL) { 438 KASSERT(*error != 0, 439 ("ipsec4_checkpolicy: getpolicy failed w/o error")); 440 newipsecstat.ips_out_inval++; 441 return NULL; 442 } 443 KASSERT(*error == 0, 444 ("ipsec4_checkpolicy: sp w/ error set to %u", *error)); 445 switch (sp->policy) { 446 case IPSEC_POLICY_ENTRUST: 447 default: 448 printf("ipsec4_checkpolicy: invalid policy %u\n", sp->policy); 449 /* fall thru... */ 450 case IPSEC_POLICY_DISCARD: 451 newipsecstat.ips_out_polvio++; 452 *error = -EINVAL; /* packet is discarded by caller */ 453 break; 454 case IPSEC_POLICY_BYPASS: 455 case IPSEC_POLICY_NONE: 456 KEY_FREESP(&sp); 457 sp = NULL; /* NB: force NULL result */ 458 break; 459 case IPSEC_POLICY_IPSEC: 460 if (sp->req == NULL) /* acquire an SA */ 461 *error = key_spdacquire(sp); 462 break; 463 } 464 if (*error != 0) { 465 KEY_FREESP(&sp); 466 sp = NULL; 467 } 468 return sp; 469 } 470 471 static int 472 ipsec4_setspidx_inpcb(m, pcb) 473 struct mbuf *m; 474 struct inpcb *pcb; 475 { 476 int error; 477 478 KASSERT(pcb != NULL, ("ipsec4_setspidx_inpcb: null pcb")); 479 KASSERT(pcb->inp_sp != NULL, ("ipsec4_setspidx_inpcb: null inp_sp")); 480 KASSERT(pcb->inp_sp->sp_out != NULL && pcb->inp_sp->sp_in != NULL, 481 ("ipsec4_setspidx_inpcb: null sp_in || sp_out")); 482 483 error = ipsec_setspidx(m, &pcb->inp_sp->sp_in->spidx, 1); 484 if (error == 0) { 485 pcb->inp_sp->sp_in->spidx.dir = IPSEC_DIR_INBOUND; 486 pcb->inp_sp->sp_out->spidx = pcb->inp_sp->sp_in->spidx; 487 pcb->inp_sp->sp_out->spidx.dir = IPSEC_DIR_OUTBOUND; 488 } else { 489 bzero(&pcb->inp_sp->sp_in->spidx, 490 sizeof (pcb->inp_sp->sp_in->spidx)); 491 bzero(&pcb->inp_sp->sp_out->spidx, 492 sizeof (pcb->inp_sp->sp_in->spidx)); 493 } 494 return error; 495 } 496 497 #ifdef INET6 498 static int 499 ipsec6_setspidx_in6pcb(m, pcb) 500 struct mbuf *m; 501 struct in6pcb *pcb; 502 { 503 struct secpolicyindex *spidx; 504 int error; 505 506 KASSERT(pcb != NULL, ("ipsec6_setspidx_in6pcb: null pcb")); 507 KASSERT(pcb->in6p_sp != NULL, ("ipsec6_setspidx_in6pcb: null inp_sp")); 508 KASSERT(pcb->in6p_sp->sp_out != NULL && pcb->in6p_sp->sp_in != NULL, 509 ("ipsec6_setspidx_in6pcb: null sp_in || sp_out")); 510 511 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 512 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 513 514 spidx = &pcb->in6p_sp->sp_in->spidx; 515 error = ipsec_setspidx(m, spidx, 1); 516 if (error) 517 goto bad; 518 spidx->dir = IPSEC_DIR_INBOUND; 519 520 spidx = &pcb->in6p_sp->sp_out->spidx; 521 error = ipsec_setspidx(m, spidx, 1); 522 if (error) 523 goto bad; 524 spidx->dir = IPSEC_DIR_OUTBOUND; 525 526 return 0; 527 528 bad: 529 bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); 530 bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); 531 return error; 532 } 533 #endif 534 535 /* 536 * configure security policy index (src/dst/proto/sport/dport) 537 * by looking at the content of mbuf. 538 * the caller is responsible for error recovery (like clearing up spidx). 539 */ 540 static int 541 ipsec_setspidx(m, spidx, needport) 542 struct mbuf *m; 543 struct secpolicyindex *spidx; 544 int needport; 545 { 546 struct ip *ip = NULL; 547 struct ip ipbuf; 548 u_int v; 549 struct mbuf *n; 550 int len; 551 int error; 552 553 KASSERT(m != NULL, ("ipsec_setspidx: null mbuf")); 554 555 /* 556 * validate m->m_pkthdr.len. we see incorrect length if we 557 * mistakenly call this function with inconsistent mbuf chain 558 * (like 4.4BSD tcp/udp processing). XXX should we panic here? 559 */ 560 len = 0; 561 for (n = m; n; n = n->m_next) 562 len += n->m_len; 563 if (m->m_pkthdr.len != len) { 564 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 565 printf("ipsec_setspidx: " 566 "total of m_len(%d) != pkthdr.len(%d), " 567 "ignored.\n", 568 len, m->m_pkthdr.len)); 569 return EINVAL; 570 } 571 572 if (m->m_pkthdr.len < sizeof(struct ip)) { 573 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 574 printf("ipsec_setspidx: " 575 "pkthdr.len(%d) < sizeof(struct ip), ignored.\n", 576 m->m_pkthdr.len)); 577 return EINVAL; 578 } 579 580 if (m->m_len >= sizeof(*ip)) 581 ip = mtod(m, struct ip *); 582 else { 583 m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); 584 ip = &ipbuf; 585 } 586 #ifdef _IP_VHL 587 v = _IP_VHL_V(ip->ip_vhl); 588 #else 589 v = ip->ip_v; 590 #endif 591 switch (v) { 592 case 4: 593 error = ipsec4_setspidx_ipaddr(m, spidx); 594 if (error) 595 return error; 596 ipsec4_get_ulp(m, spidx, needport); 597 return 0; 598 #ifdef INET6 599 case 6: 600 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { 601 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 602 printf("ipsec_setspidx: " 603 "pkthdr.len(%d) < sizeof(struct ip6_hdr), " 604 "ignored.\n", m->m_pkthdr.len)); 605 return EINVAL; 606 } 607 error = ipsec6_setspidx_ipaddr(m, spidx); 608 if (error) 609 return error; 610 ipsec6_get_ulp(m, spidx, needport); 611 return 0; 612 #endif 613 default: 614 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 615 printf("ipsec_setspidx: " 616 "unknown IP version %u, ignored.\n", v)); 617 return EINVAL; 618 } 619 } 620 621 static void 622 ipsec4_get_ulp(struct mbuf *m, struct secpolicyindex *spidx, int needport) 623 { 624 u_int8_t nxt; 625 int off; 626 627 /* sanity check */ 628 KASSERT(m != NULL, ("ipsec4_get_ulp: null mbuf")); 629 KASSERT(m->m_pkthdr.len >= sizeof(struct ip), 630 ("ipsec4_get_ulp: packet too short")); 631 632 /* NB: ip_input() flips it into host endian XXX need more checking */ 633 if (m->m_len < sizeof (struct ip)) { 634 struct ip *ip = mtod(m, struct ip *); 635 if (ip->ip_off & (IP_MF | IP_OFFMASK)) 636 goto done; 637 #ifdef _IP_VHL 638 off = _IP_VHL_HL(ip->ip_vhl) << 2; 639 #else 640 off = ip->ip_hl << 2; 641 #endif 642 nxt = ip->ip_p; 643 } else { 644 struct ip ih; 645 646 m_copydata(m, 0, sizeof (struct ip), (caddr_t) &ih); 647 if (ih.ip_off & (IP_MF | IP_OFFMASK)) 648 goto done; 649 #ifdef _IP_VHL 650 off = _IP_VHL_HL(ih.ip_vhl) << 2; 651 #else 652 off = ih.ip_hl << 2; 653 #endif 654 nxt = ih.ip_p; 655 } 656 657 while (off < m->m_pkthdr.len) { 658 struct ip6_ext ip6e; 659 struct tcphdr th; 660 struct udphdr uh; 661 662 switch (nxt) { 663 case IPPROTO_TCP: 664 spidx->ul_proto = nxt; 665 if (!needport) 666 goto done_proto; 667 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 668 goto done; 669 m_copydata(m, off, sizeof (th), (caddr_t) &th); 670 spidx->src.sin.sin_port = th.th_sport; 671 spidx->dst.sin.sin_port = th.th_dport; 672 return; 673 case IPPROTO_UDP: 674 spidx->ul_proto = nxt; 675 if (!needport) 676 goto done_proto; 677 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 678 goto done; 679 m_copydata(m, off, sizeof (uh), (caddr_t) &uh); 680 spidx->src.sin.sin_port = uh.uh_sport; 681 spidx->dst.sin.sin_port = uh.uh_dport; 682 return; 683 case IPPROTO_AH: 684 if (m->m_pkthdr.len > off + sizeof(ip6e)) 685 goto done; 686 /* XXX sigh, this works but is totally bogus */ 687 m_copydata(m, off, sizeof(ip6e), (caddr_t) &ip6e); 688 off += (ip6e.ip6e_len + 2) << 2; 689 nxt = ip6e.ip6e_nxt; 690 break; 691 case IPPROTO_ICMP: 692 default: 693 /* XXX intermediate headers??? */ 694 spidx->ul_proto = nxt; 695 goto done_proto; 696 } 697 } 698 done: 699 spidx->ul_proto = IPSEC_ULPROTO_ANY; 700 done_proto: 701 spidx->src.sin.sin_port = IPSEC_PORT_ANY; 702 spidx->dst.sin.sin_port = IPSEC_PORT_ANY; 703 } 704 705 /* assumes that m is sane */ 706 static int 707 ipsec4_setspidx_ipaddr(struct mbuf *m, struct secpolicyindex *spidx) 708 { 709 static const struct sockaddr_in template = { 710 sizeof (struct sockaddr_in), 711 AF_INET, 712 0, { 0 }, { 0, 0, 0, 0, 0, 0, 0, 0 } 713 }; 714 715 spidx->src.sin = template; 716 spidx->dst.sin = template; 717 718 if (m->m_len < sizeof (struct ip)) { 719 m_copydata(m, offsetof(struct ip, ip_src), 720 sizeof (struct in_addr), 721 (caddr_t) &spidx->src.sin.sin_addr); 722 m_copydata(m, offsetof(struct ip, ip_dst), 723 sizeof (struct in_addr), 724 (caddr_t) &spidx->dst.sin.sin_addr); 725 } else { 726 struct ip *ip = mtod(m, struct ip *); 727 spidx->src.sin.sin_addr = ip->ip_src; 728 spidx->dst.sin.sin_addr = ip->ip_dst; 729 } 730 731 spidx->prefs = sizeof(struct in_addr) << 3; 732 spidx->prefd = sizeof(struct in_addr) << 3; 733 734 return 0; 735 } 736 737 #ifdef INET6 738 static void 739 ipsec6_get_ulp(m, spidx, needport) 740 struct mbuf *m; 741 struct secpolicyindex *spidx; 742 int needport; 743 { 744 int off, nxt; 745 struct tcphdr th; 746 struct udphdr uh; 747 748 /* sanity check */ 749 if (m == NULL) 750 panic("ipsec6_get_ulp: NULL pointer was passed.\n"); 751 752 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 753 printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); 754 755 /* set default */ 756 spidx->ul_proto = IPSEC_ULPROTO_ANY; 757 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = IPSEC_PORT_ANY; 758 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = IPSEC_PORT_ANY; 759 760 nxt = -1; 761 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 762 if (off < 0 || m->m_pkthdr.len < off) 763 return; 764 765 switch (nxt) { 766 case IPPROTO_TCP: 767 spidx->ul_proto = nxt; 768 if (!needport) 769 break; 770 if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) 771 break; 772 m_copydata(m, off, sizeof(th), (caddr_t)&th); 773 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = th.th_sport; 774 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = th.th_dport; 775 break; 776 case IPPROTO_UDP: 777 spidx->ul_proto = nxt; 778 if (!needport) 779 break; 780 if (off + sizeof(struct udphdr) > m->m_pkthdr.len) 781 break; 782 m_copydata(m, off, sizeof(uh), (caddr_t)&uh); 783 ((struct sockaddr_in6 *)&spidx->src)->sin6_port = uh.uh_sport; 784 ((struct sockaddr_in6 *)&spidx->dst)->sin6_port = uh.uh_dport; 785 break; 786 case IPPROTO_ICMPV6: 787 default: 788 /* XXX intermediate headers??? */ 789 spidx->ul_proto = nxt; 790 break; 791 } 792 } 793 794 /* assumes that m is sane */ 795 static int 796 ipsec6_setspidx_ipaddr(m, spidx) 797 struct mbuf *m; 798 struct secpolicyindex *spidx; 799 { 800 struct ip6_hdr *ip6 = NULL; 801 struct ip6_hdr ip6buf; 802 struct sockaddr_in6 *sin6; 803 804 if (m->m_len >= sizeof(*ip6)) 805 ip6 = mtod(m, struct ip6_hdr *); 806 else { 807 m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); 808 ip6 = &ip6buf; 809 } 810 811 sin6 = (struct sockaddr_in6 *)&spidx->src; 812 bzero(sin6, sizeof(*sin6)); 813 sin6->sin6_family = AF_INET6; 814 sin6->sin6_len = sizeof(struct sockaddr_in6); 815 bcopy(&ip6->ip6_src, &sin6->sin6_addr, sizeof(ip6->ip6_src)); 816 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 817 sin6->sin6_addr.s6_addr16[1] = 0; 818 sin6->sin6_scope_id = ntohs(ip6->ip6_src.s6_addr16[1]); 819 } 820 spidx->prefs = sizeof(struct in6_addr) << 3; 821 822 sin6 = (struct sockaddr_in6 *)&spidx->dst; 823 bzero(sin6, sizeof(*sin6)); 824 sin6->sin6_family = AF_INET6; 825 sin6->sin6_len = sizeof(struct sockaddr_in6); 826 bcopy(&ip6->ip6_dst, &sin6->sin6_addr, sizeof(ip6->ip6_dst)); 827 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 828 sin6->sin6_addr.s6_addr16[1] = 0; 829 sin6->sin6_scope_id = ntohs(ip6->ip6_dst.s6_addr16[1]); 830 } 831 spidx->prefd = sizeof(struct in6_addr) << 3; 832 833 return 0; 834 } 835 #endif 836 837 static void 838 ipsec_delpcbpolicy(p) 839 struct inpcbpolicy *p; 840 { 841 free(p, M_IPSEC_INPCB); 842 } 843 844 /* initialize policy in PCB */ 845 int 846 ipsec_init_policy(so, pcb_sp) 847 struct socket *so; 848 struct inpcbpolicy **pcb_sp; 849 { 850 struct inpcbpolicy *new; 851 852 /* sanity check. */ 853 if (so == NULL || pcb_sp == NULL) 854 panic("ipsec_init_policy: NULL pointer was passed.\n"); 855 856 new = (struct inpcbpolicy *) malloc(sizeof(struct inpcbpolicy), 857 M_IPSEC_INPCB, M_NOWAIT|M_ZERO); 858 if (new == NULL) { 859 ipseclog((LOG_DEBUG, "ipsec_init_policy: No more memory.\n")); 860 return ENOBUFS; 861 } 862 863 if (so->so_cred != 0 && so->so_cred->cr_uid == 0) 864 new->priv = 1; 865 else 866 new->priv = 0; 867 868 if ((new->sp_in = KEY_NEWSP()) == NULL) { 869 ipsec_delpcbpolicy(new); 870 return ENOBUFS; 871 } 872 new->sp_in->state = IPSEC_SPSTATE_ALIVE; 873 new->sp_in->policy = IPSEC_POLICY_ENTRUST; 874 875 if ((new->sp_out = KEY_NEWSP()) == NULL) { 876 KEY_FREESP(&new->sp_in); 877 ipsec_delpcbpolicy(new); 878 return ENOBUFS; 879 } 880 new->sp_out->state = IPSEC_SPSTATE_ALIVE; 881 new->sp_out->policy = IPSEC_POLICY_ENTRUST; 882 883 *pcb_sp = new; 884 885 return 0; 886 } 887 888 /* copy old ipsec policy into new */ 889 int 890 ipsec_copy_policy(old, new) 891 struct inpcbpolicy *old, *new; 892 { 893 struct secpolicy *sp; 894 895 sp = ipsec_deepcopy_policy(old->sp_in); 896 if (sp) { 897 KEY_FREESP(&new->sp_in); 898 new->sp_in = sp; 899 } else 900 return ENOBUFS; 901 902 sp = ipsec_deepcopy_policy(old->sp_out); 903 if (sp) { 904 KEY_FREESP(&new->sp_out); 905 new->sp_out = sp; 906 } else 907 return ENOBUFS; 908 909 new->priv = old->priv; 910 911 return 0; 912 } 913 914 struct ipsecrequest * 915 ipsec_newisr(void) 916 { 917 struct ipsecrequest *p; 918 919 p = malloc(sizeof(struct ipsecrequest), M_IPSEC_SR, M_NOWAIT|M_ZERO); 920 if (p != NULL) 921 mtx_init(&p->lock, "ipsec request", NULL, MTX_DEF); 922 return p; 923 } 924 925 void 926 ipsec_delisr(struct ipsecrequest *p) 927 { 928 mtx_destroy(&p->lock); 929 free(p, M_IPSEC_SR); 930 } 931 932 /* deep-copy a policy in PCB */ 933 static struct secpolicy * 934 ipsec_deepcopy_policy(src) 935 struct secpolicy *src; 936 { 937 struct ipsecrequest *newchain = NULL; 938 struct ipsecrequest *p; 939 struct ipsecrequest **q; 940 struct ipsecrequest *r; 941 struct secpolicy *dst; 942 943 if (src == NULL) 944 return NULL; 945 dst = KEY_NEWSP(); 946 if (dst == NULL) 947 return NULL; 948 949 /* 950 * deep-copy IPsec request chain. This is required since struct 951 * ipsecrequest is not reference counted. 952 */ 953 q = &newchain; 954 for (p = src->req; p; p = p->next) { 955 *q = ipsec_newisr(); 956 if (*q == NULL) 957 goto fail; 958 (*q)->saidx.proto = p->saidx.proto; 959 (*q)->saidx.mode = p->saidx.mode; 960 (*q)->level = p->level; 961 (*q)->saidx.reqid = p->saidx.reqid; 962 963 bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); 964 bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); 965 966 (*q)->sp = dst; 967 968 q = &((*q)->next); 969 } 970 971 dst->req = newchain; 972 dst->state = src->state; 973 dst->policy = src->policy; 974 /* do not touch the refcnt fields */ 975 976 return dst; 977 978 fail: 979 for (p = newchain; p; p = r) { 980 r = p->next; 981 ipsec_delisr(p); 982 p = NULL; 983 } 984 return NULL; 985 } 986 987 /* set policy and ipsec request if present. */ 988 static int 989 ipsec_set_policy(pcb_sp, optname, request, len, priv) 990 struct secpolicy **pcb_sp; 991 int optname; 992 caddr_t request; 993 size_t len; 994 int priv; 995 { 996 struct sadb_x_policy *xpl; 997 struct secpolicy *newsp = NULL; 998 int error; 999 1000 /* sanity check. */ 1001 if (pcb_sp == NULL || *pcb_sp == NULL || request == NULL) 1002 return EINVAL; 1003 if (len < sizeof(*xpl)) 1004 return EINVAL; 1005 xpl = (struct sadb_x_policy *)request; 1006 1007 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1008 printf("ipsec_set_policy: passed policy\n"); 1009 kdebug_sadb_x_policy((struct sadb_ext *)xpl)); 1010 1011 /* check policy type */ 1012 /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ 1013 if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD 1014 || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) 1015 return EINVAL; 1016 1017 /* check privileged socket */ 1018 if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) 1019 return EACCES; 1020 1021 /* allocation new SP entry */ 1022 if ((newsp = key_msg2sp(xpl, len, &error)) == NULL) 1023 return error; 1024 1025 newsp->state = IPSEC_SPSTATE_ALIVE; 1026 1027 /* clear old SP and set new SP */ 1028 KEY_FREESP(pcb_sp); 1029 *pcb_sp = newsp; 1030 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1031 printf("ipsec_set_policy: new policy\n"); 1032 kdebug_secpolicy(newsp)); 1033 1034 return 0; 1035 } 1036 1037 static int 1038 ipsec_get_policy(pcb_sp, mp) 1039 struct secpolicy *pcb_sp; 1040 struct mbuf **mp; 1041 { 1042 1043 /* sanity check. */ 1044 if (pcb_sp == NULL || mp == NULL) 1045 return EINVAL; 1046 1047 *mp = key_sp2msg(pcb_sp); 1048 if (!*mp) { 1049 ipseclog((LOG_DEBUG, "ipsec_get_policy: No more memory.\n")); 1050 return ENOBUFS; 1051 } 1052 1053 (*mp)->m_type = MT_DATA; 1054 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1055 printf("ipsec_get_policy:\n"); 1056 kdebug_mbuf(*mp)); 1057 1058 return 0; 1059 } 1060 1061 int 1062 ipsec4_set_policy(inp, optname, request, len, priv) 1063 struct inpcb *inp; 1064 int optname; 1065 caddr_t request; 1066 size_t len; 1067 int priv; 1068 { 1069 struct sadb_x_policy *xpl; 1070 struct secpolicy **pcb_sp; 1071 1072 /* sanity check. */ 1073 if (inp == NULL || request == NULL) 1074 return EINVAL; 1075 if (len < sizeof(*xpl)) 1076 return EINVAL; 1077 xpl = (struct sadb_x_policy *)request; 1078 1079 /* select direction */ 1080 switch (xpl->sadb_x_policy_dir) { 1081 case IPSEC_DIR_INBOUND: 1082 pcb_sp = &inp->inp_sp->sp_in; 1083 break; 1084 case IPSEC_DIR_OUTBOUND: 1085 pcb_sp = &inp->inp_sp->sp_out; 1086 break; 1087 default: 1088 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1089 xpl->sadb_x_policy_dir)); 1090 return EINVAL; 1091 } 1092 1093 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1094 } 1095 1096 int 1097 ipsec4_get_policy(inp, request, len, mp) 1098 struct inpcb *inp; 1099 caddr_t request; 1100 size_t len; 1101 struct mbuf **mp; 1102 { 1103 struct sadb_x_policy *xpl; 1104 struct secpolicy *pcb_sp; 1105 1106 /* sanity check. */ 1107 if (inp == NULL || request == NULL || mp == NULL) 1108 return EINVAL; 1109 KASSERT(inp->inp_sp != NULL, ("ipsec4_get_policy: null inp_sp")); 1110 if (len < sizeof(*xpl)) 1111 return EINVAL; 1112 xpl = (struct sadb_x_policy *)request; 1113 1114 /* select direction */ 1115 switch (xpl->sadb_x_policy_dir) { 1116 case IPSEC_DIR_INBOUND: 1117 pcb_sp = inp->inp_sp->sp_in; 1118 break; 1119 case IPSEC_DIR_OUTBOUND: 1120 pcb_sp = inp->inp_sp->sp_out; 1121 break; 1122 default: 1123 ipseclog((LOG_ERR, "ipsec4_set_policy: invalid direction=%u\n", 1124 xpl->sadb_x_policy_dir)); 1125 return EINVAL; 1126 } 1127 1128 return ipsec_get_policy(pcb_sp, mp); 1129 } 1130 1131 /* delete policy in PCB */ 1132 int 1133 ipsec4_delete_pcbpolicy(inp) 1134 struct inpcb *inp; 1135 { 1136 KASSERT(inp != NULL, ("ipsec4_delete_pcbpolicy: null inp")); 1137 1138 if (inp->inp_sp == NULL) 1139 return 0; 1140 1141 if (inp->inp_sp->sp_in != NULL) 1142 KEY_FREESP(&inp->inp_sp->sp_in); 1143 1144 if (inp->inp_sp->sp_out != NULL) 1145 KEY_FREESP(&inp->inp_sp->sp_out); 1146 1147 ipsec_delpcbpolicy(inp->inp_sp); 1148 inp->inp_sp = NULL; 1149 1150 return 0; 1151 } 1152 1153 #ifdef INET6 1154 int 1155 ipsec6_set_policy(in6p, optname, request, len, priv) 1156 struct in6pcb *in6p; 1157 int optname; 1158 caddr_t request; 1159 size_t len; 1160 int priv; 1161 { 1162 struct sadb_x_policy *xpl; 1163 struct secpolicy **pcb_sp; 1164 1165 /* sanity check. */ 1166 if (in6p == NULL || request == NULL) 1167 return EINVAL; 1168 if (len < sizeof(*xpl)) 1169 return EINVAL; 1170 xpl = (struct sadb_x_policy *)request; 1171 1172 /* select direction */ 1173 switch (xpl->sadb_x_policy_dir) { 1174 case IPSEC_DIR_INBOUND: 1175 pcb_sp = &in6p->in6p_sp->sp_in; 1176 break; 1177 case IPSEC_DIR_OUTBOUND: 1178 pcb_sp = &in6p->in6p_sp->sp_out; 1179 break; 1180 default: 1181 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1182 xpl->sadb_x_policy_dir)); 1183 return EINVAL; 1184 } 1185 1186 return ipsec_set_policy(pcb_sp, optname, request, len, priv); 1187 } 1188 1189 int 1190 ipsec6_get_policy(in6p, request, len, mp) 1191 struct in6pcb *in6p; 1192 caddr_t request; 1193 size_t len; 1194 struct mbuf **mp; 1195 { 1196 struct sadb_x_policy *xpl; 1197 struct secpolicy *pcb_sp; 1198 1199 /* sanity check. */ 1200 if (in6p == NULL || request == NULL || mp == NULL) 1201 return EINVAL; 1202 KASSERT(in6p->in6p_sp != NULL, ("ipsec6_get_policy: null in6p_sp")); 1203 if (len < sizeof(*xpl)) 1204 return EINVAL; 1205 xpl = (struct sadb_x_policy *)request; 1206 1207 /* select direction */ 1208 switch (xpl->sadb_x_policy_dir) { 1209 case IPSEC_DIR_INBOUND: 1210 pcb_sp = in6p->in6p_sp->sp_in; 1211 break; 1212 case IPSEC_DIR_OUTBOUND: 1213 pcb_sp = in6p->in6p_sp->sp_out; 1214 break; 1215 default: 1216 ipseclog((LOG_ERR, "ipsec6_set_policy: invalid direction=%u\n", 1217 xpl->sadb_x_policy_dir)); 1218 return EINVAL; 1219 } 1220 1221 return ipsec_get_policy(pcb_sp, mp); 1222 } 1223 1224 int 1225 ipsec6_delete_pcbpolicy(in6p) 1226 struct in6pcb *in6p; 1227 { 1228 KASSERT(in6p != NULL, ("ipsec6_delete_pcbpolicy: null in6p")); 1229 1230 if (in6p->in6p_sp == NULL) 1231 return 0; 1232 1233 if (in6p->in6p_sp->sp_in != NULL) 1234 KEY_FREESP(&in6p->in6p_sp->sp_in); 1235 1236 if (in6p->in6p_sp->sp_out != NULL) 1237 KEY_FREESP(&in6p->in6p_sp->sp_out); 1238 1239 ipsec_delpcbpolicy(in6p->in6p_sp); 1240 in6p->in6p_sp = NULL; 1241 1242 return 0; 1243 } 1244 #endif 1245 1246 /* 1247 * return current level. 1248 * Either IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. 1249 */ 1250 u_int 1251 ipsec_get_reqlevel(isr) 1252 struct ipsecrequest *isr; 1253 { 1254 u_int level = 0; 1255 u_int esp_trans_deflev, esp_net_deflev; 1256 u_int ah_trans_deflev, ah_net_deflev; 1257 1258 KASSERT(isr != NULL && isr->sp != NULL, 1259 ("ipsec_get_reqlevel: null argument")); 1260 KASSERT(isr->sp->spidx.src.sa.sa_family == isr->sp->spidx.dst.sa.sa_family, 1261 ("ipsec_get_reqlevel: af family mismatch, src %u, dst %u", 1262 isr->sp->spidx.src.sa.sa_family, 1263 isr->sp->spidx.dst.sa.sa_family)); 1264 1265 /* XXX note that we have ipseclog() expanded here - code sync issue */ 1266 #define IPSEC_CHECK_DEFAULT(lev) \ 1267 (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE \ 1268 && (lev) != IPSEC_LEVEL_UNIQUE) \ 1269 ? (ipsec_debug \ 1270 ? log(LOG_INFO, "fixed system default level " #lev ":%d->%d\n",\ 1271 (lev), IPSEC_LEVEL_REQUIRE) \ 1272 : 0), \ 1273 (lev) = IPSEC_LEVEL_REQUIRE, \ 1274 (lev) \ 1275 : (lev)) 1276 1277 /* set default level */ 1278 switch (((struct sockaddr *)&isr->sp->spidx.src)->sa_family) { 1279 #ifdef INET 1280 case AF_INET: 1281 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); 1282 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); 1283 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); 1284 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); 1285 break; 1286 #endif 1287 #ifdef INET6 1288 case AF_INET6: 1289 esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); 1290 esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); 1291 ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); 1292 ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); 1293 break; 1294 #endif /* INET6 */ 1295 default: 1296 panic("key_get_reqlevel: unknown af %u", 1297 isr->sp->spidx.src.sa.sa_family); 1298 } 1299 1300 #undef IPSEC_CHECK_DEFAULT 1301 1302 /* set level */ 1303 switch (isr->level) { 1304 case IPSEC_LEVEL_DEFAULT: 1305 switch (isr->saidx.proto) { 1306 case IPPROTO_ESP: 1307 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1308 level = esp_net_deflev; 1309 else 1310 level = esp_trans_deflev; 1311 break; 1312 case IPPROTO_AH: 1313 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 1314 level = ah_net_deflev; 1315 else 1316 level = ah_trans_deflev; 1317 case IPPROTO_IPCOMP: 1318 /* 1319 * we don't really care, as IPcomp document says that 1320 * we shouldn't compress small packets 1321 */ 1322 level = IPSEC_LEVEL_USE; 1323 break; 1324 default: 1325 panic("ipsec_get_reqlevel: " 1326 "Illegal protocol defined %u\n", 1327 isr->saidx.proto); 1328 } 1329 break; 1330 1331 case IPSEC_LEVEL_USE: 1332 case IPSEC_LEVEL_REQUIRE: 1333 level = isr->level; 1334 break; 1335 case IPSEC_LEVEL_UNIQUE: 1336 level = IPSEC_LEVEL_REQUIRE; 1337 break; 1338 1339 default: 1340 panic("ipsec_get_reqlevel: Illegal IPsec level %u\n", 1341 isr->level); 1342 } 1343 1344 return level; 1345 } 1346 1347 /* 1348 * Check security policy requirements against the actual 1349 * packet contents. Return one if the packet should be 1350 * reject as "invalid"; otherwiser return zero to have the 1351 * packet treated as "valid". 1352 * 1353 * OUT: 1354 * 0: valid 1355 * 1: invalid 1356 */ 1357 int 1358 ipsec_in_reject(struct secpolicy *sp, struct mbuf *m) 1359 { 1360 struct ipsecrequest *isr; 1361 int need_auth; 1362 1363 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1364 printf("ipsec_in_reject: using SP\n"); 1365 kdebug_secpolicy(sp)); 1366 1367 /* check policy */ 1368 switch (sp->policy) { 1369 case IPSEC_POLICY_DISCARD: 1370 return 1; 1371 case IPSEC_POLICY_BYPASS: 1372 case IPSEC_POLICY_NONE: 1373 return 0; 1374 } 1375 1376 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1377 ("ipsec_in_reject: invalid policy %u", sp->policy)); 1378 1379 /* XXX should compare policy against ipsec header history */ 1380 1381 need_auth = 0; 1382 for (isr = sp->req; isr != NULL; isr = isr->next) { 1383 if (ipsec_get_reqlevel(isr) != IPSEC_LEVEL_REQUIRE) 1384 continue; 1385 switch (isr->saidx.proto) { 1386 case IPPROTO_ESP: 1387 if ((m->m_flags & M_DECRYPTED) == 0) { 1388 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1389 printf("ipsec_in_reject: ESP m_flags:%x\n", 1390 m->m_flags)); 1391 return 1; 1392 } 1393 1394 if (!need_auth && 1395 isr->sav != NULL && 1396 isr->sav->tdb_authalgxform != NULL && 1397 (m->m_flags & M_AUTHIPDGM) == 0) { 1398 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1399 printf("ipsec_in_reject: ESP/AH m_flags:%x\n", 1400 m->m_flags)); 1401 return 1; 1402 } 1403 break; 1404 case IPPROTO_AH: 1405 need_auth = 1; 1406 if ((m->m_flags & M_AUTHIPHDR) == 0) { 1407 KEYDEBUG(KEYDEBUG_IPSEC_DUMP, 1408 printf("ipsec_in_reject: AH m_flags:%x\n", 1409 m->m_flags)); 1410 return 1; 1411 } 1412 break; 1413 case IPPROTO_IPCOMP: 1414 /* 1415 * we don't really care, as IPcomp document 1416 * says that we shouldn't compress small 1417 * packets, IPComp policy should always be 1418 * treated as being in "use" level. 1419 */ 1420 break; 1421 } 1422 } 1423 return 0; /* valid */ 1424 } 1425 1426 /* 1427 * Check AH/ESP integrity. 1428 * This function is called from tcp_input(), udp_input(), 1429 * and {ah,esp}4_input for tunnel mode 1430 */ 1431 int 1432 ipsec4_in_reject(m, inp) 1433 struct mbuf *m; 1434 struct inpcb *inp; 1435 { 1436 struct secpolicy *sp; 1437 int error; 1438 int result; 1439 1440 KASSERT(m != NULL, ("ipsec4_in_reject_so: null mbuf")); 1441 1442 /* get SP for this packet. 1443 * When we are called from ip_forward(), we call 1444 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1445 */ 1446 if (inp == NULL) 1447 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1448 else 1449 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1450 1451 if (sp != NULL) { 1452 result = ipsec_in_reject(sp, m); 1453 if (result) 1454 newipsecstat.ips_in_polvio++; 1455 KEY_FREESP(&sp); 1456 } else { 1457 result = 0; /* XXX should be panic ? 1458 * -> No, there may be error. */ 1459 } 1460 return result; 1461 } 1462 1463 #ifdef INET6 1464 /* 1465 * Check AH/ESP integrity. 1466 * This function is called from tcp6_input(), udp6_input(), 1467 * and {ah,esp}6_input for tunnel mode 1468 */ 1469 int 1470 ipsec6_in_reject(m, inp) 1471 struct mbuf *m; 1472 struct inpcb *inp; 1473 { 1474 struct secpolicy *sp = NULL; 1475 int error; 1476 int result; 1477 1478 /* sanity check */ 1479 if (m == NULL) 1480 return 0; /* XXX should be panic ? */ 1481 1482 /* get SP for this packet. 1483 * When we are called from ip_forward(), we call 1484 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1485 */ 1486 if (inp == NULL) 1487 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); 1488 else 1489 sp = ipsec_getpolicybysock(m, IPSEC_DIR_INBOUND, inp, &error); 1490 1491 if (sp != NULL) { 1492 result = ipsec_in_reject(sp, m); 1493 if (result) 1494 newipsecstat.ips_in_polvio++; 1495 KEY_FREESP(&sp); 1496 } else { 1497 result = 0; 1498 } 1499 return result; 1500 } 1501 #endif 1502 1503 /* 1504 * compute the byte size to be occupied by IPsec header. 1505 * in case it is tunneled, it includes the size of outer IP header. 1506 * NOTE: SP passed is free in this function. 1507 */ 1508 static size_t 1509 ipsec_hdrsiz(struct secpolicy *sp) 1510 { 1511 struct ipsecrequest *isr; 1512 size_t siz; 1513 1514 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1515 printf("ipsec_hdrsiz: using SP\n"); 1516 kdebug_secpolicy(sp)); 1517 1518 switch (sp->policy) { 1519 case IPSEC_POLICY_DISCARD: 1520 case IPSEC_POLICY_BYPASS: 1521 case IPSEC_POLICY_NONE: 1522 return 0; 1523 } 1524 1525 KASSERT(sp->policy == IPSEC_POLICY_IPSEC, 1526 ("ipsec_hdrsiz: invalid policy %u", sp->policy)); 1527 1528 siz = 0; 1529 for (isr = sp->req; isr != NULL; isr = isr->next) { 1530 size_t clen = 0; 1531 1532 switch (isr->saidx.proto) { 1533 case IPPROTO_ESP: 1534 clen = esp_hdrsiz(isr->sav); 1535 break; 1536 case IPPROTO_AH: 1537 clen = ah_hdrsiz(isr->sav); 1538 break; 1539 case IPPROTO_IPCOMP: 1540 clen = sizeof(struct ipcomp); 1541 break; 1542 } 1543 1544 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 1545 switch (isr->saidx.dst.sa.sa_family) { 1546 case AF_INET: 1547 clen += sizeof(struct ip); 1548 break; 1549 #ifdef INET6 1550 case AF_INET6: 1551 clen += sizeof(struct ip6_hdr); 1552 break; 1553 #endif 1554 default: 1555 ipseclog((LOG_ERR, "ipsec_hdrsiz: " 1556 "unknown AF %d in IPsec tunnel SA\n", 1557 ((struct sockaddr *)&isr->saidx.dst)->sa_family)); 1558 break; 1559 } 1560 } 1561 siz += clen; 1562 } 1563 1564 return siz; 1565 } 1566 1567 /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ 1568 size_t 1569 ipsec4_hdrsiz(m, dir, inp) 1570 struct mbuf *m; 1571 u_int dir; 1572 struct inpcb *inp; 1573 { 1574 struct secpolicy *sp; 1575 int error; 1576 size_t size; 1577 1578 KASSERT(m != NULL, ("ipsec4_hdrsiz: null mbuf")); 1579 1580 /* get SP for this packet. 1581 * When we are called from ip_forward(), we call 1582 * ipsec_getpolicybyaddr() with IP_FORWARDING flag. 1583 */ 1584 if (inp == NULL) 1585 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1586 else 1587 sp = ipsec_getpolicybysock(m, dir, inp, &error); 1588 1589 if (sp != NULL) { 1590 size = ipsec_hdrsiz(sp); 1591 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1592 printf("ipsec4_hdrsiz: size:%lu.\n", 1593 (unsigned long)size)); 1594 1595 KEY_FREESP(&sp); 1596 } else { 1597 size = 0; /* XXX should be panic ? */ 1598 } 1599 return size; 1600 } 1601 1602 #ifdef INET6 1603 /* This function is called from ipsec6_hdrsize_tcp(), 1604 * and maybe from ip6_forward.() 1605 */ 1606 size_t 1607 ipsec6_hdrsiz(m, dir, in6p) 1608 struct mbuf *m; 1609 u_int dir; 1610 struct in6pcb *in6p; 1611 { 1612 struct secpolicy *sp; 1613 int error; 1614 size_t size; 1615 1616 KASSERT(m != NULL, ("ipsec6_hdrsiz: null mbuf")); 1617 KASSERT(in6p == NULL || in6p->in6p_socket != NULL, 1618 ("ipsec6_hdrsize: socket w/o inpcb")); 1619 1620 /* get SP for this packet */ 1621 /* XXX Is it right to call with IP_FORWARDING. */ 1622 if (in6p == NULL) 1623 sp = ipsec_getpolicybyaddr(m, dir, IP_FORWARDING, &error); 1624 else 1625 sp = ipsec_getpolicybysock(m, dir, in6p, &error); 1626 1627 if (sp == NULL) 1628 return 0; 1629 size = ipsec_hdrsiz(sp); 1630 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 1631 printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); 1632 KEY_FREESP(&sp); 1633 1634 return size; 1635 } 1636 #endif /*INET6*/ 1637 1638 /* 1639 * Check the variable replay window. 1640 * ipsec_chkreplay() performs replay check before ICV verification. 1641 * ipsec_updatereplay() updates replay bitmap. This must be called after 1642 * ICV verification (it also performs replay check, which is usually done 1643 * beforehand). 1644 * 0 (zero) is returned if packet disallowed, 1 if packet permitted. 1645 * 1646 * based on RFC 2401. 1647 */ 1648 int 1649 ipsec_chkreplay(seq, sav) 1650 u_int32_t seq; 1651 struct secasvar *sav; 1652 { 1653 const struct secreplay *replay; 1654 u_int32_t diff; 1655 int fr; 1656 u_int32_t wsizeb; /* constant: bits of window size */ 1657 int frlast; /* constant: last frame */ 1658 1659 #if 0 1660 SPLASSERT(net, "ipsec_chkreplay"); 1661 #endif 1662 1663 KASSERT(sav != NULL, ("ipsec_chkreplay: Null SA")); 1664 KASSERT(sav->replay != NULL, ("ipsec_chkreplay: Null replay state")); 1665 1666 replay = sav->replay; 1667 1668 if (replay->wsize == 0) 1669 return 1; /* no need to check replay. */ 1670 1671 /* constant */ 1672 frlast = replay->wsize - 1; 1673 wsizeb = replay->wsize << 3; 1674 1675 /* sequence number of 0 is invalid */ 1676 if (seq == 0) 1677 return 0; 1678 1679 /* first time is always okay */ 1680 if (replay->count == 0) 1681 return 1; 1682 1683 if (seq > replay->lastseq) { 1684 /* larger sequences are okay */ 1685 return 1; 1686 } else { 1687 /* seq is equal or less than lastseq. */ 1688 diff = replay->lastseq - seq; 1689 1690 /* over range to check, i.e. too old or wrapped */ 1691 if (diff >= wsizeb) 1692 return 0; 1693 1694 fr = frlast - diff / 8; 1695 1696 /* this packet already seen ? */ 1697 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1698 return 0; 1699 1700 /* out of order but good */ 1701 return 1; 1702 } 1703 } 1704 1705 /* 1706 * check replay counter whether to update or not. 1707 * OUT: 0: OK 1708 * 1: NG 1709 */ 1710 int 1711 ipsec_updatereplay(seq, sav) 1712 u_int32_t seq; 1713 struct secasvar *sav; 1714 { 1715 struct secreplay *replay; 1716 u_int32_t diff; 1717 int fr; 1718 u_int32_t wsizeb; /* constant: bits of window size */ 1719 int frlast; /* constant: last frame */ 1720 1721 #if 0 1722 SPLASSERT(net, "ipsec_updatereplay"); 1723 #endif 1724 1725 KASSERT(sav != NULL, ("ipsec_updatereplay: Null SA")); 1726 KASSERT(sav->replay != NULL, ("ipsec_updatereplay: Null replay state")); 1727 1728 replay = sav->replay; 1729 1730 if (replay->wsize == 0) 1731 goto ok; /* no need to check replay. */ 1732 1733 /* constant */ 1734 frlast = replay->wsize - 1; 1735 wsizeb = replay->wsize << 3; 1736 1737 /* sequence number of 0 is invalid */ 1738 if (seq == 0) 1739 return 1; 1740 1741 /* first time */ 1742 if (replay->count == 0) { 1743 replay->lastseq = seq; 1744 bzero(replay->bitmap, replay->wsize); 1745 (replay->bitmap)[frlast] = 1; 1746 goto ok; 1747 } 1748 1749 if (seq > replay->lastseq) { 1750 /* seq is larger than lastseq. */ 1751 diff = seq - replay->lastseq; 1752 1753 /* new larger sequence number */ 1754 if (diff < wsizeb) { 1755 /* In window */ 1756 /* set bit for this packet */ 1757 vshiftl(replay->bitmap, diff, replay->wsize); 1758 (replay->bitmap)[frlast] |= 1; 1759 } else { 1760 /* this packet has a "way larger" */ 1761 bzero(replay->bitmap, replay->wsize); 1762 (replay->bitmap)[frlast] = 1; 1763 } 1764 replay->lastseq = seq; 1765 1766 /* larger is good */ 1767 } else { 1768 /* seq is equal or less than lastseq. */ 1769 diff = replay->lastseq - seq; 1770 1771 /* over range to check, i.e. too old or wrapped */ 1772 if (diff >= wsizeb) 1773 return 1; 1774 1775 fr = frlast - diff / 8; 1776 1777 /* this packet already seen ? */ 1778 if ((replay->bitmap)[fr] & (1 << (diff % 8))) 1779 return 1; 1780 1781 /* mark as seen */ 1782 (replay->bitmap)[fr] |= (1 << (diff % 8)); 1783 1784 /* out of order but good */ 1785 } 1786 1787 ok: 1788 if (replay->count == ~0) { 1789 1790 /* set overflow flag */ 1791 replay->overflow++; 1792 1793 /* don't increment, no more packets accepted */ 1794 if ((sav->flags & SADB_X_EXT_CYCSEQ) == 0) 1795 return 1; 1796 1797 ipseclog((LOG_WARNING, "replay counter made %d cycle. %s\n", 1798 replay->overflow, ipsec_logsastr(sav))); 1799 } 1800 1801 replay->count++; 1802 1803 return 0; 1804 } 1805 1806 /* 1807 * shift variable length bunffer to left. 1808 * IN: bitmap: pointer to the buffer 1809 * nbit: the number of to shift. 1810 * wsize: buffer size (bytes). 1811 */ 1812 static void 1813 vshiftl(bitmap, nbit, wsize) 1814 unsigned char *bitmap; 1815 int nbit, wsize; 1816 { 1817 int s, j, i; 1818 unsigned char over; 1819 1820 for (j = 0; j < nbit; j += 8) { 1821 s = (nbit - j < 8) ? (nbit - j): 8; 1822 bitmap[0] <<= s; 1823 for (i = 1; i < wsize; i++) { 1824 over = (bitmap[i] >> (8 - s)); 1825 bitmap[i] <<= s; 1826 bitmap[i-1] |= over; 1827 } 1828 } 1829 1830 return; 1831 } 1832 1833 /* Return a printable string for the IPv4 address. */ 1834 static char * 1835 inet_ntoa4(struct in_addr ina) 1836 { 1837 static char buf[4][4 * sizeof "123" + 4]; 1838 unsigned char *ucp = (unsigned char *) &ina; 1839 static int i = 3; 1840 1841 i = (i + 1) % 4; 1842 sprintf(buf[i], "%d.%d.%d.%d", ucp[0] & 0xff, ucp[1] & 0xff, 1843 ucp[2] & 0xff, ucp[3] & 0xff); 1844 return (buf[i]); 1845 } 1846 1847 /* Return a printable string for the address. */ 1848 char * 1849 ipsec_address(union sockaddr_union* sa) 1850 { 1851 switch (sa->sa.sa_family) { 1852 #if INET 1853 case AF_INET: 1854 return inet_ntoa4(sa->sin.sin_addr); 1855 #endif /* INET */ 1856 1857 #if INET6 1858 case AF_INET6: 1859 return ip6_sprintf(&sa->sin6.sin6_addr); 1860 #endif /* INET6 */ 1861 1862 default: 1863 return "(unknown address family)"; 1864 } 1865 } 1866 1867 const char * 1868 ipsec_logsastr(sav) 1869 struct secasvar *sav; 1870 { 1871 static char buf[256]; 1872 char *p; 1873 struct secasindex *saidx = &sav->sah->saidx; 1874 1875 KASSERT(saidx->src.sa.sa_family == saidx->dst.sa.sa_family, 1876 ("ipsec_logsastr: address family mismatch")); 1877 1878 p = buf; 1879 snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); 1880 while (p && *p) 1881 p++; 1882 /* NB: only use ipsec_address on one address at a time */ 1883 snprintf(p, sizeof (buf) - (p - buf), "src=%s ", 1884 ipsec_address(&saidx->src)); 1885 while (p && *p) 1886 p++; 1887 snprintf(p, sizeof (buf) - (p - buf), "dst=%s)", 1888 ipsec_address(&saidx->dst)); 1889 1890 return buf; 1891 } 1892 1893 void 1894 ipsec_dumpmbuf(m) 1895 struct mbuf *m; 1896 { 1897 int totlen; 1898 int i; 1899 u_char *p; 1900 1901 totlen = 0; 1902 printf("---\n"); 1903 while (m) { 1904 p = mtod(m, u_char *); 1905 for (i = 0; i < m->m_len; i++) { 1906 printf("%02x ", p[i]); 1907 totlen++; 1908 if (totlen % 16 == 0) 1909 printf("\n"); 1910 } 1911 m = m->m_next; 1912 } 1913 if (totlen % 16 != 0) 1914 printf("\n"); 1915 printf("---\n"); 1916 } 1917 1918 /* XXX this stuff doesn't belong here... */ 1919 1920 static struct xformsw* xforms = NULL; 1921 1922 /* 1923 * Register a transform; typically at system startup. 1924 */ 1925 void 1926 xform_register(struct xformsw* xsp) 1927 { 1928 xsp->xf_next = xforms; 1929 xforms = xsp; 1930 } 1931 1932 /* 1933 * Initialize transform support in an sav. 1934 */ 1935 int 1936 xform_init(struct secasvar *sav, int xftype) 1937 { 1938 struct xformsw *xsp; 1939 1940 if (sav->tdb_xform != NULL) /* previously initialized */ 1941 return 0; 1942 for (xsp = xforms; xsp; xsp = xsp->xf_next) 1943 if (xsp->xf_type == xftype) 1944 return (*xsp->xf_init)(sav, xsp); 1945 return EINVAL; 1946 } 1947