key.c revision 275822
1/* $FreeBSD: stable/10/sys/netipsec/key.c 275822 2014-12-16 11:24:07Z ae $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 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 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59 60#include <net/if.h> 61#include <net/route.h> 62#include <net/raw_cb.h> 63#include <net/vnet.h> 64 65#include <netinet/in.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#include <netinet/in_var.h> 69 70#ifdef INET6 71#include <netinet/ip6.h> 72#include <netinet6/in6_var.h> 73#include <netinet6/ip6_var.h> 74#endif /* INET6 */ 75 76#if defined(INET) || defined(INET6) 77#include <netinet/in_pcb.h> 78#endif 79#ifdef INET6 80#include <netinet6/in6_pcb.h> 81#endif /* INET6 */ 82 83#include <net/pfkeyv2.h> 84#include <netipsec/keydb.h> 85#include <netipsec/key.h> 86#include <netipsec/keysock.h> 87#include <netipsec/key_debug.h> 88 89#include <netipsec/ipsec.h> 90#ifdef INET6 91#include <netipsec/ipsec6.h> 92#endif 93 94#include <netipsec/xform.h> 95 96#include <machine/stdarg.h> 97 98/* randomness */ 99#include <sys/random.h> 100 101#define FULLMASK 0xff 102#define _BITS(bytes) ((bytes) << 3) 103 104/* 105 * Note on SA reference counting: 106 * - SAs that are not in DEAD state will have (total external reference + 1) 107 * following value in reference count field. they cannot be freed and are 108 * referenced from SA header. 109 * - SAs that are in DEAD state will have (total external reference) 110 * in reference count field. they are ready to be freed. reference from 111 * SA header will be removed in key_delsav(), when the reference count 112 * field hits 0 (= no external reference other than from SA header. 113 */ 114 115VNET_DEFINE(u_int32_t, key_debug_level) = 0; 116static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 117static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 118static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 119static VNET_DEFINE(u_int32_t, policy_id) = 0; 120/*interval to initialize randseed,1(m)*/ 121static VNET_DEFINE(u_int, key_int_random) = 60; 122/* interval to expire acquiring, 30(s)*/ 123static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 124/* counter for blocking SADB_ACQUIRE.*/ 125static VNET_DEFINE(int, key_blockacq_count) = 10; 126/* lifetime for blocking SADB_ACQUIRE.*/ 127static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 128/* preferred old sa rather than new sa.*/ 129static VNET_DEFINE(int, key_preferred_oldsa) = 1; 130#define V_key_spi_trycnt VNET(key_spi_trycnt) 131#define V_key_spi_minval VNET(key_spi_minval) 132#define V_key_spi_maxval VNET(key_spi_maxval) 133#define V_policy_id VNET(policy_id) 134#define V_key_int_random VNET(key_int_random) 135#define V_key_larval_lifetime VNET(key_larval_lifetime) 136#define V_key_blockacq_count VNET(key_blockacq_count) 137#define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 138#define V_key_preferred_oldsa VNET(key_preferred_oldsa) 139 140static VNET_DEFINE(u_int32_t, acq_seq) = 0; 141#define V_acq_seq VNET(acq_seq) 142 143 /* SPD */ 144static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 145#define V_sptree VNET(sptree) 146static struct mtx sptree_lock; 147#define SPTREE_LOCK_INIT() \ 148 mtx_init(&sptree_lock, "sptree", \ 149 "fast ipsec security policy database", MTX_DEF) 150#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 151#define SPTREE_LOCK() mtx_lock(&sptree_lock) 152#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 153#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 154 155static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 156#define V_sahtree VNET(sahtree) 157static struct mtx sahtree_lock; 158#define SAHTREE_LOCK_INIT() \ 159 mtx_init(&sahtree_lock, "sahtree", \ 160 "fast ipsec security association database", MTX_DEF) 161#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 162#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 163#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 164#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 165 166 /* registed list */ 167static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 168#define V_regtree VNET(regtree) 169static struct mtx regtree_lock; 170#define REGTREE_LOCK_INIT() \ 171 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 172#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 173#define REGTREE_LOCK() mtx_lock(®tree_lock) 174#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 175#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 176 177static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 178#define V_acqtree VNET(acqtree) 179static struct mtx acq_lock; 180#define ACQ_LOCK_INIT() \ 181 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 182#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 183#define ACQ_LOCK() mtx_lock(&acq_lock) 184#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 185#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 186 187 /* SP acquiring list */ 188static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 189#define V_spacqtree VNET(spacqtree) 190static struct mtx spacq_lock; 191#define SPACQ_LOCK_INIT() \ 192 mtx_init(&spacq_lock, "spacqtree", \ 193 "fast ipsec security policy acquire list", MTX_DEF) 194#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 195#define SPACQ_LOCK() mtx_lock(&spacq_lock) 196#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 197#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 198 199/* search order for SAs */ 200static const u_int saorder_state_valid_prefer_old[] = { 201 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 202}; 203static const u_int saorder_state_valid_prefer_new[] = { 204 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 205}; 206static const u_int saorder_state_alive[] = { 207 /* except DEAD */ 208 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 209}; 210static const u_int saorder_state_any[] = { 211 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 212 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 213}; 214 215static const int minsize[] = { 216 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 217 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 220 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 221 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 223 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 224 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 225 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 226 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 227 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 228 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 229 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 230 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 231 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 232 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 233 0, /* SADB_X_EXT_KMPRIVATE */ 234 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 235 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 236 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 237 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 238 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 239 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 240 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 241 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 242}; 243static const int maxsize[] = { 244 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 245 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 246 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 248 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 249 0, /* SADB_EXT_ADDRESS_SRC */ 250 0, /* SADB_EXT_ADDRESS_DST */ 251 0, /* SADB_EXT_ADDRESS_PROXY */ 252 0, /* SADB_EXT_KEY_AUTH */ 253 0, /* SADB_EXT_KEY_ENCRYPT */ 254 0, /* SADB_EXT_IDENTITY_SRC */ 255 0, /* SADB_EXT_IDENTITY_DST */ 256 0, /* SADB_EXT_SENSITIVITY */ 257 0, /* SADB_EXT_PROPOSAL */ 258 0, /* SADB_EXT_SUPPORTED_AUTH */ 259 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 260 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 261 0, /* SADB_X_EXT_KMPRIVATE */ 262 0, /* SADB_X_EXT_POLICY */ 263 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 264 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 265 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 266 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 267 0, /* SADB_X_EXT_NAT_T_OAI */ 268 0, /* SADB_X_EXT_NAT_T_OAR */ 269 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 270}; 271 272static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 273static VNET_DEFINE(int, ipsec_esp_auth) = 0; 274static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 275 276#define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 277#define V_ipsec_esp_auth VNET(ipsec_esp_auth) 278#define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 279 280#ifdef SYSCTL_DECL 281SYSCTL_DECL(_net_key); 282#endif 283 284SYSCTL_VNET_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 285 CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 286 287/* max count of trial for the decision of spi value */ 288SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 289 CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 290 291/* minimum spi value to allocate automatically. */ 292SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MIN_VALUE, 293 spi_minval, CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 294 295/* maximun spi value to allocate automatically. */ 296SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MAX_VALUE, 297 spi_maxval, CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 298 299/* interval to initialize randseed */ 300SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 301 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 302 303/* lifetime for larval SA */ 304SYSCTL_VNET_INT(_net_key, KEYCTL_LARVAL_LIFETIME, 305 larval_lifetime, CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 306 307/* counter for blocking to send SADB_ACQUIRE to IKEd */ 308SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, 309 blockacq_count, CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 310 311/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 312SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 313 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 314 315/* ESP auth */ 316SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 317 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 318 319/* minimum ESP key length */ 320SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 321 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 322 323/* minimum AH key length */ 324SYSCTL_VNET_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 325 CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 326 327/* perfered old SA rather than new SA */ 328SYSCTL_VNET_INT(_net_key, KEYCTL_PREFERED_OLDSA, 329 preferred_oldsa, CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 330 331#define __LIST_CHAINED(elm) \ 332 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 333#define LIST_INSERT_TAIL(head, elm, type, field) \ 334do {\ 335 struct type *curelm = LIST_FIRST(head); \ 336 if (curelm == NULL) {\ 337 LIST_INSERT_HEAD(head, elm, field); \ 338 } else { \ 339 while (LIST_NEXT(curelm, field)) \ 340 curelm = LIST_NEXT(curelm, field);\ 341 LIST_INSERT_AFTER(curelm, elm, field);\ 342 }\ 343} while (0) 344 345#define KEY_CHKSASTATE(head, sav, name) \ 346do { \ 347 if ((head) != (sav)) { \ 348 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 349 (name), (head), (sav))); \ 350 continue; \ 351 } \ 352} while (0) 353 354#define KEY_CHKSPDIR(head, sp, name) \ 355do { \ 356 if ((head) != (sp)) { \ 357 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 358 "anyway continue.\n", \ 359 (name), (head), (sp))); \ 360 } \ 361} while (0) 362 363MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 364MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 365MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 366MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 367MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 368MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 369MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 370 371/* 372 * set parameters into secpolicyindex buffer. 373 * Must allocate secpolicyindex buffer passed to this function. 374 */ 375#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 376do { \ 377 bzero((idx), sizeof(struct secpolicyindex)); \ 378 (idx)->dir = (_dir); \ 379 (idx)->prefs = (ps); \ 380 (idx)->prefd = (pd); \ 381 (idx)->ul_proto = (ulp); \ 382 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 383 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 384} while (0) 385 386/* 387 * set parameters into secasindex buffer. 388 * Must allocate secasindex buffer before calling this function. 389 */ 390#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 391do { \ 392 bzero((idx), sizeof(struct secasindex)); \ 393 (idx)->proto = (p); \ 394 (idx)->mode = (m); \ 395 (idx)->reqid = (r); \ 396 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 397 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 398} while (0) 399 400/* key statistics */ 401struct _keystat { 402 u_long getspi_count; /* the avarage of count to try to get new SPI */ 403} keystat; 404 405struct sadb_msghdr { 406 struct sadb_msg *msg; 407 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 408 int extoff[SADB_EXT_MAX + 1]; 409 int extlen[SADB_EXT_MAX + 1]; 410}; 411 412static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 413static void key_freesp_so __P((struct secpolicy **)); 414static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 415static void key_delsp __P((struct secpolicy *)); 416static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 417static void _key_delsp(struct secpolicy *sp); 418static struct secpolicy *key_getspbyid __P((u_int32_t)); 419static u_int32_t key_newreqid __P((void)); 420static struct mbuf *key_gather_mbuf __P((struct mbuf *, 421 const struct sadb_msghdr *, int, int, ...)); 422static int key_spdadd __P((struct socket *, struct mbuf *, 423 const struct sadb_msghdr *)); 424static u_int32_t key_getnewspid __P((void)); 425static int key_spddelete __P((struct socket *, struct mbuf *, 426 const struct sadb_msghdr *)); 427static int key_spddelete2 __P((struct socket *, struct mbuf *, 428 const struct sadb_msghdr *)); 429static int key_spdget __P((struct socket *, struct mbuf *, 430 const struct sadb_msghdr *)); 431static int key_spdflush __P((struct socket *, struct mbuf *, 432 const struct sadb_msghdr *)); 433static int key_spddump __P((struct socket *, struct mbuf *, 434 const struct sadb_msghdr *)); 435static struct mbuf *key_setdumpsp __P((struct secpolicy *, 436 u_int8_t, u_int32_t, u_int32_t)); 437static u_int key_getspreqmsglen __P((struct secpolicy *)); 438static int key_spdexpire __P((struct secpolicy *)); 439static struct secashead *key_newsah __P((struct secasindex *)); 440static void key_delsah __P((struct secashead *)); 441static struct secasvar *key_newsav __P((struct mbuf *, 442 const struct sadb_msghdr *, struct secashead *, int *, 443 const char*, int)); 444#define KEY_NEWSAV(m, sadb, sah, e) \ 445 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 446static void key_delsav __P((struct secasvar *)); 447static struct secashead *key_getsah __P((struct secasindex *)); 448static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 449static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 450static int key_setsaval __P((struct secasvar *, struct mbuf *, 451 const struct sadb_msghdr *)); 452static int key_mature __P((struct secasvar *)); 453static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 454 u_int8_t, u_int32_t, u_int32_t)); 455static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 456 u_int32_t, pid_t, u_int16_t)); 457static struct mbuf *key_setsadbsa __P((struct secasvar *)); 458static struct mbuf *key_setsadbaddr __P((u_int16_t, 459 const struct sockaddr *, u_int8_t, u_int16_t)); 460#ifdef IPSEC_NAT_T 461static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 462static struct mbuf *key_setsadbxtype(u_int16_t); 463#endif 464static void key_porttosaddr(struct sockaddr *, u_int16_t); 465#define KEY_PORTTOSADDR(saddr, port) \ 466 key_porttosaddr((struct sockaddr *)(saddr), (port)) 467static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 468static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 469 u_int32_t)); 470static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 471 struct malloc_type *); 472static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 473 struct malloc_type *type); 474#ifdef INET6 475static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 476#endif 477 478/* flags for key_cmpsaidx() */ 479#define CMP_HEAD 1 /* protocol, addresses. */ 480#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 481#define CMP_REQID 3 /* additionally HEAD, reaid. */ 482#define CMP_EXACTLY 4 /* all elements. */ 483static int key_cmpsaidx 484 __P((const struct secasindex *, const struct secasindex *, int)); 485 486static int key_cmpspidx_exactly 487 __P((struct secpolicyindex *, struct secpolicyindex *)); 488static int key_cmpspidx_withmask 489 __P((struct secpolicyindex *, struct secpolicyindex *)); 490static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 491static int key_bbcmp __P((const void *, const void *, u_int)); 492static u_int16_t key_satype2proto __P((u_int8_t)); 493static u_int8_t key_proto2satype __P((u_int16_t)); 494 495static int key_getspi __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 498 struct secasindex *)); 499static int key_update __P((struct socket *, struct mbuf *, 500 const struct sadb_msghdr *)); 501#ifdef IPSEC_DOSEQCHECK 502static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 503#endif 504static int key_add __P((struct socket *, struct mbuf *, 505 const struct sadb_msghdr *)); 506static int key_setident __P((struct secashead *, struct mbuf *, 507 const struct sadb_msghdr *)); 508static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 509 const struct sadb_msghdr *)); 510static int key_delete __P((struct socket *, struct mbuf *, 511 const struct sadb_msghdr *)); 512static int key_get __P((struct socket *, struct mbuf *, 513 const struct sadb_msghdr *)); 514 515static void key_getcomb_setlifetime __P((struct sadb_comb *)); 516static struct mbuf *key_getcomb_esp __P((void)); 517static struct mbuf *key_getcomb_ah __P((void)); 518static struct mbuf *key_getcomb_ipcomp __P((void)); 519static struct mbuf *key_getprop __P((const struct secasindex *)); 520 521static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 522static struct secacq *key_newacq __P((const struct secasindex *)); 523static struct secacq *key_getacq __P((const struct secasindex *)); 524static struct secacq *key_getacqbyseq __P((u_int32_t)); 525static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 526static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 527static int key_acquire2 __P((struct socket *, struct mbuf *, 528 const struct sadb_msghdr *)); 529static int key_register __P((struct socket *, struct mbuf *, 530 const struct sadb_msghdr *)); 531static int key_expire __P((struct secasvar *)); 532static int key_flush __P((struct socket *, struct mbuf *, 533 const struct sadb_msghdr *)); 534static int key_dump __P((struct socket *, struct mbuf *, 535 const struct sadb_msghdr *)); 536static int key_promisc __P((struct socket *, struct mbuf *, 537 const struct sadb_msghdr *)); 538static int key_senderror __P((struct socket *, struct mbuf *, int)); 539static int key_validate_ext __P((const struct sadb_ext *, int)); 540static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 541static struct mbuf *key_setlifetime(struct seclifetime *src, 542 u_int16_t exttype); 543static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 544 545#if 0 546static const char *key_getfqdn __P((void)); 547static const char *key_getuserfqdn __P((void)); 548#endif 549static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 550 551static __inline void 552sa_initref(struct secasvar *sav) 553{ 554 555 refcount_init(&sav->refcnt, 1); 556} 557static __inline void 558sa_addref(struct secasvar *sav) 559{ 560 561 refcount_acquire(&sav->refcnt); 562 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 563} 564static __inline int 565sa_delref(struct secasvar *sav) 566{ 567 568 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 569 return (refcount_release(&sav->refcnt)); 570} 571 572#define SP_ADDREF(p) do { \ 573 (p)->refcnt++; \ 574 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 575} while (0) 576#define SP_DELREF(p) do { \ 577 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 578 (p)->refcnt--; \ 579} while (0) 580 581 582/* 583 * Update the refcnt while holding the SPTREE lock. 584 */ 585void 586key_addref(struct secpolicy *sp) 587{ 588 SPTREE_LOCK(); 589 SP_ADDREF(sp); 590 SPTREE_UNLOCK(); 591} 592 593/* 594 * Return 0 when there are known to be no SP's for the specified 595 * direction. Otherwise return 1. This is used by IPsec code 596 * to optimize performance. 597 */ 598int 599key_havesp(u_int dir) 600{ 601 602 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 603 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 604} 605 606/* %%% IPsec policy management */ 607/* 608 * allocating a SP for OUTBOUND or INBOUND packet. 609 * Must call key_freesp() later. 610 * OUT: NULL: not found 611 * others: found and return the pointer. 612 */ 613struct secpolicy * 614key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 615{ 616 struct secpolicy *sp; 617 618 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 619 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 620 ("invalid direction %u", dir)); 621 622 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 623 printf("DP %s from %s:%u\n", __func__, where, tag)); 624 625 /* get a SP entry */ 626 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 627 printf("*** objects\n"); 628 kdebug_secpolicyindex(spidx)); 629 630 SPTREE_LOCK(); 631 LIST_FOREACH(sp, &V_sptree[dir], chain) { 632 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 633 printf("*** in SPD\n"); 634 kdebug_secpolicyindex(&sp->spidx)); 635 636 if (sp->state == IPSEC_SPSTATE_DEAD) 637 continue; 638 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 639 goto found; 640 } 641 sp = NULL; 642found: 643 if (sp) { 644 /* sanity check */ 645 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 646 647 /* found a SPD entry */ 648 sp->lastused = time_second; 649 SP_ADDREF(sp); 650 } 651 SPTREE_UNLOCK(); 652 653 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 654 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 655 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 656 return sp; 657} 658 659/* 660 * allocating a SP for OUTBOUND or INBOUND packet. 661 * Must call key_freesp() later. 662 * OUT: NULL: not found 663 * others: found and return the pointer. 664 */ 665struct secpolicy * 666key_allocsp2(u_int32_t spi, 667 union sockaddr_union *dst, 668 u_int8_t proto, 669 u_int dir, 670 const char* where, int tag) 671{ 672 struct secpolicy *sp; 673 674 IPSEC_ASSERT(dst != NULL, ("null dst")); 675 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 676 ("invalid direction %u", dir)); 677 678 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 679 printf("DP %s from %s:%u\n", __func__, where, tag)); 680 681 /* get a SP entry */ 682 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 683 printf("*** objects\n"); 684 printf("spi %u proto %u dir %u\n", spi, proto, dir); 685 kdebug_sockaddr(&dst->sa)); 686 687 SPTREE_LOCK(); 688 LIST_FOREACH(sp, &V_sptree[dir], chain) { 689 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 690 printf("*** in SPD\n"); 691 kdebug_secpolicyindex(&sp->spidx)); 692 693 if (sp->state == IPSEC_SPSTATE_DEAD) 694 continue; 695 /* compare simple values, then dst address */ 696 if (sp->spidx.ul_proto != proto) 697 continue; 698 /* NB: spi's must exist and match */ 699 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 700 continue; 701 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 702 goto found; 703 } 704 sp = NULL; 705found: 706 if (sp) { 707 /* sanity check */ 708 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 709 710 /* found a SPD entry */ 711 sp->lastused = time_second; 712 SP_ADDREF(sp); 713 } 714 SPTREE_UNLOCK(); 715 716 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 717 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 718 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 719 return sp; 720} 721 722#if 0 723/* 724 * return a policy that matches this particular inbound packet. 725 * XXX slow 726 */ 727struct secpolicy * 728key_gettunnel(const struct sockaddr *osrc, 729 const struct sockaddr *odst, 730 const struct sockaddr *isrc, 731 const struct sockaddr *idst, 732 const char* where, int tag) 733{ 734 struct secpolicy *sp; 735 const int dir = IPSEC_DIR_INBOUND; 736 struct ipsecrequest *r1, *r2, *p; 737 struct secpolicyindex spidx; 738 739 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 740 printf("DP %s from %s:%u\n", __func__, where, tag)); 741 742 if (isrc->sa_family != idst->sa_family) { 743 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 744 __func__, isrc->sa_family, idst->sa_family)); 745 sp = NULL; 746 goto done; 747 } 748 749 SPTREE_LOCK(); 750 LIST_FOREACH(sp, &V_sptree[dir], chain) { 751 if (sp->state == IPSEC_SPSTATE_DEAD) 752 continue; 753 754 r1 = r2 = NULL; 755 for (p = sp->req; p; p = p->next) { 756 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 757 continue; 758 759 r1 = r2; 760 r2 = p; 761 762 if (!r1) { 763 /* here we look at address matches only */ 764 spidx = sp->spidx; 765 if (isrc->sa_len > sizeof(spidx.src) || 766 idst->sa_len > sizeof(spidx.dst)) 767 continue; 768 bcopy(isrc, &spidx.src, isrc->sa_len); 769 bcopy(idst, &spidx.dst, idst->sa_len); 770 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 771 continue; 772 } else { 773 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 774 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 775 continue; 776 } 777 778 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 779 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 780 continue; 781 782 goto found; 783 } 784 } 785 sp = NULL; 786found: 787 if (sp) { 788 sp->lastused = time_second; 789 SP_ADDREF(sp); 790 } 791 SPTREE_UNLOCK(); 792done: 793 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 794 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 795 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 796 return sp; 797} 798#endif 799 800/* 801 * allocating an SA entry for an *OUTBOUND* packet. 802 * checking each request entries in SP, and acquire an SA if need. 803 * OUT: 0: there are valid requests. 804 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 805 */ 806int 807key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 808{ 809 u_int level; 810 int error; 811 struct secasvar *sav; 812 813 IPSEC_ASSERT(isr != NULL, ("null isr")); 814 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 815 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 816 saidx->mode == IPSEC_MODE_TUNNEL, 817 ("unexpected policy %u", saidx->mode)); 818 819 /* 820 * XXX guard against protocol callbacks from the crypto 821 * thread as they reference ipsecrequest.sav which we 822 * temporarily null out below. Need to rethink how we 823 * handle bundled SA's in the callback thread. 824 */ 825 IPSECREQUEST_LOCK_ASSERT(isr); 826 827 /* get current level */ 828 level = ipsec_get_reqlevel(isr); 829 830 /* 831 * We check new SA in the IPsec request because a different 832 * SA may be involved each time this request is checked, either 833 * because new SAs are being configured, or this request is 834 * associated with an unconnected datagram socket, or this request 835 * is associated with a system default policy. 836 * 837 * key_allocsa_policy should allocate the oldest SA available. 838 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 839 */ 840 sav = key_allocsa_policy(saidx); 841 if (sav != isr->sav) { 842 /* SA need to be updated. */ 843 if (!IPSECREQUEST_UPGRADE(isr)) { 844 /* Kick everyone off. */ 845 IPSECREQUEST_UNLOCK(isr); 846 IPSECREQUEST_WLOCK(isr); 847 } 848 if (isr->sav != NULL) 849 KEY_FREESAV(&isr->sav); 850 isr->sav = sav; 851 IPSECREQUEST_DOWNGRADE(isr); 852 } else if (sav != NULL) 853 KEY_FREESAV(&sav); 854 855 /* When there is SA. */ 856 if (isr->sav != NULL) { 857 if (isr->sav->state != SADB_SASTATE_MATURE && 858 isr->sav->state != SADB_SASTATE_DYING) 859 return EINVAL; 860 return 0; 861 } 862 863 /* there is no SA */ 864 error = key_acquire(saidx, isr->sp); 865 if (error != 0) { 866 /* XXX What should I do ? */ 867 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 868 __func__, error)); 869 return error; 870 } 871 872 if (level != IPSEC_LEVEL_REQUIRE) { 873 /* XXX sigh, the interface to this routine is botched */ 874 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 875 return 0; 876 } else { 877 return ENOENT; 878 } 879} 880 881/* 882 * allocating a SA for policy entry from SAD. 883 * NOTE: searching SAD of aliving state. 884 * OUT: NULL: not found. 885 * others: found and return the pointer. 886 */ 887static struct secasvar * 888key_allocsa_policy(const struct secasindex *saidx) 889{ 890#define N(a) _ARRAYLEN(a) 891 struct secashead *sah; 892 struct secasvar *sav; 893 u_int stateidx, arraysize; 894 const u_int *state_valid; 895 896 state_valid = NULL; /* silence gcc */ 897 arraysize = 0; /* silence gcc */ 898 899 SAHTREE_LOCK(); 900 LIST_FOREACH(sah, &V_sahtree, chain) { 901 if (sah->state == SADB_SASTATE_DEAD) 902 continue; 903 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 904 if (V_key_preferred_oldsa) { 905 state_valid = saorder_state_valid_prefer_old; 906 arraysize = N(saorder_state_valid_prefer_old); 907 } else { 908 state_valid = saorder_state_valid_prefer_new; 909 arraysize = N(saorder_state_valid_prefer_new); 910 } 911 break; 912 } 913 } 914 SAHTREE_UNLOCK(); 915 if (sah == NULL) 916 return NULL; 917 918 /* search valid state */ 919 for (stateidx = 0; stateidx < arraysize; stateidx++) { 920 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 921 if (sav != NULL) 922 return sav; 923 } 924 925 return NULL; 926#undef N 927} 928 929/* 930 * searching SAD with direction, protocol, mode and state. 931 * called by key_allocsa_policy(). 932 * OUT: 933 * NULL : not found 934 * others : found, pointer to a SA. 935 */ 936static struct secasvar * 937key_do_allocsa_policy(struct secashead *sah, u_int state) 938{ 939 struct secasvar *sav, *nextsav, *candidate, *d; 940 941 /* initilize */ 942 candidate = NULL; 943 944 SAHTREE_LOCK(); 945 for (sav = LIST_FIRST(&sah->savtree[state]); 946 sav != NULL; 947 sav = nextsav) { 948 949 nextsav = LIST_NEXT(sav, chain); 950 951 /* sanity check */ 952 KEY_CHKSASTATE(sav->state, state, __func__); 953 954 /* initialize */ 955 if (candidate == NULL) { 956 candidate = sav; 957 continue; 958 } 959 960 /* Which SA is the better ? */ 961 962 IPSEC_ASSERT(candidate->lft_c != NULL, 963 ("null candidate lifetime")); 964 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 965 966 /* What the best method is to compare ? */ 967 if (V_key_preferred_oldsa) { 968 if (candidate->lft_c->addtime > 969 sav->lft_c->addtime) { 970 candidate = sav; 971 } 972 continue; 973 /*NOTREACHED*/ 974 } 975 976 /* preferred new sa rather than old sa */ 977 if (candidate->lft_c->addtime < 978 sav->lft_c->addtime) { 979 d = candidate; 980 candidate = sav; 981 } else 982 d = sav; 983 984 /* 985 * prepared to delete the SA when there is more 986 * suitable candidate and the lifetime of the SA is not 987 * permanent. 988 */ 989 if (d->lft_h->addtime != 0) { 990 struct mbuf *m, *result; 991 u_int8_t satype; 992 993 key_sa_chgstate(d, SADB_SASTATE_DEAD); 994 995 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 996 997 satype = key_proto2satype(d->sah->saidx.proto); 998 if (satype == 0) 999 goto msgfail; 1000 1001 m = key_setsadbmsg(SADB_DELETE, 0, 1002 satype, 0, 0, d->refcnt - 1); 1003 if (!m) 1004 goto msgfail; 1005 result = m; 1006 1007 /* set sadb_address for saidx's. */ 1008 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1009 &d->sah->saidx.src.sa, 1010 d->sah->saidx.src.sa.sa_len << 3, 1011 IPSEC_ULPROTO_ANY); 1012 if (!m) 1013 goto msgfail; 1014 m_cat(result, m); 1015 1016 /* set sadb_address for saidx's. */ 1017 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1018 &d->sah->saidx.dst.sa, 1019 d->sah->saidx.dst.sa.sa_len << 3, 1020 IPSEC_ULPROTO_ANY); 1021 if (!m) 1022 goto msgfail; 1023 m_cat(result, m); 1024 1025 /* create SA extension */ 1026 m = key_setsadbsa(d); 1027 if (!m) 1028 goto msgfail; 1029 m_cat(result, m); 1030 1031 if (result->m_len < sizeof(struct sadb_msg)) { 1032 result = m_pullup(result, 1033 sizeof(struct sadb_msg)); 1034 if (result == NULL) 1035 goto msgfail; 1036 } 1037 1038 result->m_pkthdr.len = 0; 1039 for (m = result; m; m = m->m_next) 1040 result->m_pkthdr.len += m->m_len; 1041 mtod(result, struct sadb_msg *)->sadb_msg_len = 1042 PFKEY_UNIT64(result->m_pkthdr.len); 1043 1044 if (key_sendup_mbuf(NULL, result, 1045 KEY_SENDUP_REGISTERED)) 1046 goto msgfail; 1047 msgfail: 1048 KEY_FREESAV(&d); 1049 } 1050 } 1051 if (candidate) { 1052 sa_addref(candidate); 1053 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1054 printf("DP %s cause refcnt++:%d SA:%p\n", 1055 __func__, candidate->refcnt, candidate)); 1056 } 1057 SAHTREE_UNLOCK(); 1058 1059 return candidate; 1060} 1061 1062/* 1063 * allocating a usable SA entry for a *INBOUND* packet. 1064 * Must call key_freesav() later. 1065 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1066 * NULL: not found, or error occured. 1067 * 1068 * In the comparison, no source address is used--for RFC2401 conformance. 1069 * To quote, from section 4.1: 1070 * A security association is uniquely identified by a triple consisting 1071 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1072 * security protocol (AH or ESP) identifier. 1073 * Note that, however, we do need to keep source address in IPsec SA. 1074 * IKE specification and PF_KEY specification do assume that we 1075 * keep source address in IPsec SA. We see a tricky situation here. 1076 */ 1077struct secasvar * 1078key_allocsa( 1079 union sockaddr_union *dst, 1080 u_int proto, 1081 u_int32_t spi, 1082 const char* where, int tag) 1083{ 1084 struct secashead *sah; 1085 struct secasvar *sav; 1086 u_int stateidx, arraysize, state; 1087 const u_int *saorder_state_valid; 1088#ifdef IPSEC_NAT_T 1089 int natt_chkport; 1090#endif 1091 1092 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1093 1094 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1095 printf("DP %s from %s:%u\n", __func__, where, tag)); 1096 1097#ifdef IPSEC_NAT_T 1098 natt_chkport = (dst->sa.sa_family == AF_INET && 1099 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1100 dst->sin.sin_port != 0); 1101#endif 1102 1103 /* 1104 * searching SAD. 1105 * XXX: to be checked internal IP header somewhere. Also when 1106 * IPsec tunnel packet is received. But ESP tunnel mode is 1107 * encrypted so we can't check internal IP header. 1108 */ 1109 SAHTREE_LOCK(); 1110 if (V_key_preferred_oldsa) { 1111 saorder_state_valid = saorder_state_valid_prefer_old; 1112 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1113 } else { 1114 saorder_state_valid = saorder_state_valid_prefer_new; 1115 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1116 } 1117 LIST_FOREACH(sah, &V_sahtree, chain) { 1118 int checkport; 1119 1120 /* search valid state */ 1121 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1122 state = saorder_state_valid[stateidx]; 1123 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1124 /* sanity check */ 1125 KEY_CHKSASTATE(sav->state, state, __func__); 1126 /* do not return entries w/ unusable state */ 1127 if (sav->state != SADB_SASTATE_MATURE && 1128 sav->state != SADB_SASTATE_DYING) 1129 continue; 1130 if (proto != sav->sah->saidx.proto) 1131 continue; 1132 if (spi != sav->spi) 1133 continue; 1134 checkport = 0; 1135#ifdef IPSEC_NAT_T 1136 /* 1137 * Really only check ports when this is a NAT-T 1138 * SA. Otherwise other lookups providing ports 1139 * might suffer. 1140 */ 1141 if (sav->natt_type && natt_chkport) 1142 checkport = 1; 1143#endif 1144#if 0 /* don't check src */ 1145 /* check src address */ 1146 if (key_sockaddrcmp(&src->sa, 1147 &sav->sah->saidx.src.sa, checkport) != 0) 1148 continue; 1149#endif 1150 /* check dst address */ 1151 if (key_sockaddrcmp(&dst->sa, 1152 &sav->sah->saidx.dst.sa, checkport) != 0) 1153 continue; 1154 sa_addref(sav); 1155 goto done; 1156 } 1157 } 1158 } 1159 sav = NULL; 1160done: 1161 SAHTREE_UNLOCK(); 1162 1163 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1164 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1165 sav, sav ? sav->refcnt : 0)); 1166 return sav; 1167} 1168 1169/* 1170 * Must be called after calling key_allocsp(). 1171 * For both the packet without socket and key_freeso(). 1172 */ 1173void 1174_key_freesp(struct secpolicy **spp, const char* where, int tag) 1175{ 1176 struct secpolicy *sp = *spp; 1177 1178 IPSEC_ASSERT(sp != NULL, ("null sp")); 1179 1180 SPTREE_LOCK(); 1181 SP_DELREF(sp); 1182 1183 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1184 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1185 __func__, sp, sp->id, where, tag, sp->refcnt)); 1186 1187 if (sp->refcnt == 0) { 1188 *spp = NULL; 1189 key_delsp(sp); 1190 } 1191 SPTREE_UNLOCK(); 1192} 1193 1194/* 1195 * Must be called after calling key_allocsp(). 1196 * For the packet with socket. 1197 */ 1198void 1199key_freeso(struct socket *so) 1200{ 1201 IPSEC_ASSERT(so != NULL, ("null so")); 1202 1203 switch (so->so_proto->pr_domain->dom_family) { 1204#if defined(INET) || defined(INET6) 1205#ifdef INET 1206 case PF_INET: 1207#endif 1208#ifdef INET6 1209 case PF_INET6: 1210#endif 1211 { 1212 struct inpcb *pcb = sotoinpcb(so); 1213 1214 /* Does it have a PCB ? */ 1215 if (pcb == NULL) 1216 return; 1217 key_freesp_so(&pcb->inp_sp->sp_in); 1218 key_freesp_so(&pcb->inp_sp->sp_out); 1219 } 1220 break; 1221#endif /* INET || INET6 */ 1222 default: 1223 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1224 __func__, so->so_proto->pr_domain->dom_family)); 1225 return; 1226 } 1227} 1228 1229static void 1230key_freesp_so(struct secpolicy **sp) 1231{ 1232 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1233 1234 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1235 (*sp)->policy == IPSEC_POLICY_BYPASS) 1236 return; 1237 1238 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1239 ("invalid policy %u", (*sp)->policy)); 1240 KEY_FREESP(sp); 1241} 1242 1243void 1244key_addrefsa(struct secasvar *sav, const char* where, int tag) 1245{ 1246 1247 IPSEC_ASSERT(sav != NULL, ("null sav")); 1248 IPSEC_ASSERT(sav->refcnt > 0, ("refcount must exist")); 1249 1250 sa_addref(sav); 1251} 1252 1253/* 1254 * Must be called after calling key_allocsa(). 1255 * This function is called by key_freesp() to free some SA allocated 1256 * for a policy. 1257 */ 1258void 1259key_freesav(struct secasvar **psav, const char* where, int tag) 1260{ 1261 struct secasvar *sav = *psav; 1262 1263 IPSEC_ASSERT(sav != NULL, ("null sav")); 1264 1265 if (sa_delref(sav)) { 1266 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1267 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1268 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1269 *psav = NULL; 1270 key_delsav(sav); 1271 } else { 1272 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1273 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1274 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1275 } 1276} 1277 1278/* %%% SPD management */ 1279/* 1280 * free security policy entry. 1281 */ 1282static void 1283key_delsp(struct secpolicy *sp) 1284{ 1285 struct ipsecrequest *isr, *nextisr; 1286 1287 IPSEC_ASSERT(sp != NULL, ("null sp")); 1288 SPTREE_LOCK_ASSERT(); 1289 1290 sp->state = IPSEC_SPSTATE_DEAD; 1291 1292 IPSEC_ASSERT(sp->refcnt == 0, 1293 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1294 1295 /* remove from SP index */ 1296 if (__LIST_CHAINED(sp)) 1297 LIST_REMOVE(sp, chain); 1298 1299 for (isr = sp->req; isr != NULL; isr = nextisr) { 1300 if (isr->sav != NULL) { 1301 KEY_FREESAV(&isr->sav); 1302 isr->sav = NULL; 1303 } 1304 1305 nextisr = isr->next; 1306 ipsec_delisr(isr); 1307 } 1308 _key_delsp(sp); 1309} 1310 1311/* 1312 * search SPD 1313 * OUT: NULL : not found 1314 * others : found, pointer to a SP. 1315 */ 1316static struct secpolicy * 1317key_getsp(struct secpolicyindex *spidx) 1318{ 1319 struct secpolicy *sp; 1320 1321 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1322 1323 SPTREE_LOCK(); 1324 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1325 if (sp->state == IPSEC_SPSTATE_DEAD) 1326 continue; 1327 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1328 SP_ADDREF(sp); 1329 break; 1330 } 1331 } 1332 SPTREE_UNLOCK(); 1333 1334 return sp; 1335} 1336 1337/* 1338 * get SP by index. 1339 * OUT: NULL : not found 1340 * others : found, pointer to a SP. 1341 */ 1342static struct secpolicy * 1343key_getspbyid(u_int32_t id) 1344{ 1345 struct secpolicy *sp; 1346 1347 SPTREE_LOCK(); 1348 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1349 if (sp->state == IPSEC_SPSTATE_DEAD) 1350 continue; 1351 if (sp->id == id) { 1352 SP_ADDREF(sp); 1353 goto done; 1354 } 1355 } 1356 1357 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1358 if (sp->state == IPSEC_SPSTATE_DEAD) 1359 continue; 1360 if (sp->id == id) { 1361 SP_ADDREF(sp); 1362 goto done; 1363 } 1364 } 1365done: 1366 SPTREE_UNLOCK(); 1367 1368 return sp; 1369} 1370 1371struct secpolicy * 1372key_newsp(const char* where, int tag) 1373{ 1374 struct secpolicy *newsp = NULL; 1375 1376 newsp = (struct secpolicy *) 1377 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1378 if (newsp) { 1379 SECPOLICY_LOCK_INIT(newsp); 1380 newsp->refcnt = 1; 1381 newsp->req = NULL; 1382 } 1383 1384 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1385 printf("DP %s from %s:%u return SP:%p\n", __func__, 1386 where, tag, newsp)); 1387 return newsp; 1388} 1389 1390static void 1391_key_delsp(struct secpolicy *sp) 1392{ 1393 SECPOLICY_LOCK_DESTROY(sp); 1394 free(sp, M_IPSEC_SP); 1395} 1396 1397/* 1398 * create secpolicy structure from sadb_x_policy structure. 1399 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1400 * so must be set properly later. 1401 */ 1402struct secpolicy * 1403key_msg2sp(xpl0, len, error) 1404 struct sadb_x_policy *xpl0; 1405 size_t len; 1406 int *error; 1407{ 1408 struct secpolicy *newsp; 1409 1410 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1411 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1412 1413 if (len != PFKEY_EXTLEN(xpl0)) { 1414 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1415 *error = EINVAL; 1416 return NULL; 1417 } 1418 1419 if ((newsp = KEY_NEWSP()) == NULL) { 1420 *error = ENOBUFS; 1421 return NULL; 1422 } 1423 1424 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1425 newsp->policy = xpl0->sadb_x_policy_type; 1426 1427 /* check policy */ 1428 switch (xpl0->sadb_x_policy_type) { 1429 case IPSEC_POLICY_DISCARD: 1430 case IPSEC_POLICY_NONE: 1431 case IPSEC_POLICY_ENTRUST: 1432 case IPSEC_POLICY_BYPASS: 1433 newsp->req = NULL; 1434 break; 1435 1436 case IPSEC_POLICY_IPSEC: 1437 { 1438 int tlen; 1439 struct sadb_x_ipsecrequest *xisr; 1440 struct ipsecrequest **p_isr = &newsp->req; 1441 1442 /* validity check */ 1443 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1444 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1445 __func__)); 1446 KEY_FREESP(&newsp); 1447 *error = EINVAL; 1448 return NULL; 1449 } 1450 1451 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1452 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1453 1454 while (tlen > 0) { 1455 /* length check */ 1456 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1457 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1458 "length.\n", __func__)); 1459 KEY_FREESP(&newsp); 1460 *error = EINVAL; 1461 return NULL; 1462 } 1463 1464 /* allocate request buffer */ 1465 /* NB: data structure is zero'd */ 1466 *p_isr = ipsec_newisr(); 1467 if ((*p_isr) == NULL) { 1468 ipseclog((LOG_DEBUG, 1469 "%s: No more memory.\n", __func__)); 1470 KEY_FREESP(&newsp); 1471 *error = ENOBUFS; 1472 return NULL; 1473 } 1474 1475 /* set values */ 1476 switch (xisr->sadb_x_ipsecrequest_proto) { 1477 case IPPROTO_ESP: 1478 case IPPROTO_AH: 1479 case IPPROTO_IPCOMP: 1480 break; 1481 default: 1482 ipseclog((LOG_DEBUG, 1483 "%s: invalid proto type=%u\n", __func__, 1484 xisr->sadb_x_ipsecrequest_proto)); 1485 KEY_FREESP(&newsp); 1486 *error = EPROTONOSUPPORT; 1487 return NULL; 1488 } 1489 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1490 1491 switch (xisr->sadb_x_ipsecrequest_mode) { 1492 case IPSEC_MODE_TRANSPORT: 1493 case IPSEC_MODE_TUNNEL: 1494 break; 1495 case IPSEC_MODE_ANY: 1496 default: 1497 ipseclog((LOG_DEBUG, 1498 "%s: invalid mode=%u\n", __func__, 1499 xisr->sadb_x_ipsecrequest_mode)); 1500 KEY_FREESP(&newsp); 1501 *error = EINVAL; 1502 return NULL; 1503 } 1504 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1505 1506 switch (xisr->sadb_x_ipsecrequest_level) { 1507 case IPSEC_LEVEL_DEFAULT: 1508 case IPSEC_LEVEL_USE: 1509 case IPSEC_LEVEL_REQUIRE: 1510 break; 1511 case IPSEC_LEVEL_UNIQUE: 1512 /* validity check */ 1513 /* 1514 * If range violation of reqid, kernel will 1515 * update it, don't refuse it. 1516 */ 1517 if (xisr->sadb_x_ipsecrequest_reqid 1518 > IPSEC_MANUAL_REQID_MAX) { 1519 ipseclog((LOG_DEBUG, 1520 "%s: reqid=%d range " 1521 "violation, updated by kernel.\n", 1522 __func__, 1523 xisr->sadb_x_ipsecrequest_reqid)); 1524 xisr->sadb_x_ipsecrequest_reqid = 0; 1525 } 1526 1527 /* allocate new reqid id if reqid is zero. */ 1528 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1529 u_int32_t reqid; 1530 if ((reqid = key_newreqid()) == 0) { 1531 KEY_FREESP(&newsp); 1532 *error = ENOBUFS; 1533 return NULL; 1534 } 1535 (*p_isr)->saidx.reqid = reqid; 1536 xisr->sadb_x_ipsecrequest_reqid = reqid; 1537 } else { 1538 /* set it for manual keying. */ 1539 (*p_isr)->saidx.reqid = 1540 xisr->sadb_x_ipsecrequest_reqid; 1541 } 1542 break; 1543 1544 default: 1545 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1546 __func__, 1547 xisr->sadb_x_ipsecrequest_level)); 1548 KEY_FREESP(&newsp); 1549 *error = EINVAL; 1550 return NULL; 1551 } 1552 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1553 1554 /* set IP addresses if there */ 1555 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1556 struct sockaddr *paddr; 1557 1558 paddr = (struct sockaddr *)(xisr + 1); 1559 1560 /* validity check */ 1561 if (paddr->sa_len 1562 > sizeof((*p_isr)->saidx.src)) { 1563 ipseclog((LOG_DEBUG, "%s: invalid " 1564 "request address length.\n", 1565 __func__)); 1566 KEY_FREESP(&newsp); 1567 *error = EINVAL; 1568 return NULL; 1569 } 1570 bcopy(paddr, &(*p_isr)->saidx.src, 1571 paddr->sa_len); 1572 1573 paddr = (struct sockaddr *)((caddr_t)paddr 1574 + paddr->sa_len); 1575 1576 /* validity check */ 1577 if (paddr->sa_len 1578 > sizeof((*p_isr)->saidx.dst)) { 1579 ipseclog((LOG_DEBUG, "%s: invalid " 1580 "request address length.\n", 1581 __func__)); 1582 KEY_FREESP(&newsp); 1583 *error = EINVAL; 1584 return NULL; 1585 } 1586 bcopy(paddr, &(*p_isr)->saidx.dst, 1587 paddr->sa_len); 1588 } 1589 1590 (*p_isr)->sp = newsp; 1591 1592 /* initialization for the next. */ 1593 p_isr = &(*p_isr)->next; 1594 tlen -= xisr->sadb_x_ipsecrequest_len; 1595 1596 /* validity check */ 1597 if (tlen < 0) { 1598 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1599 __func__)); 1600 KEY_FREESP(&newsp); 1601 *error = EINVAL; 1602 return NULL; 1603 } 1604 1605 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1606 + xisr->sadb_x_ipsecrequest_len); 1607 } 1608 } 1609 break; 1610 default: 1611 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1612 KEY_FREESP(&newsp); 1613 *error = EINVAL; 1614 return NULL; 1615 } 1616 1617 *error = 0; 1618 return newsp; 1619} 1620 1621static u_int32_t 1622key_newreqid() 1623{ 1624 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1625 1626 auto_reqid = (auto_reqid == ~0 1627 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1628 1629 /* XXX should be unique check */ 1630 1631 return auto_reqid; 1632} 1633 1634/* 1635 * copy secpolicy struct to sadb_x_policy structure indicated. 1636 */ 1637struct mbuf * 1638key_sp2msg(sp) 1639 struct secpolicy *sp; 1640{ 1641 struct sadb_x_policy *xpl; 1642 int tlen; 1643 caddr_t p; 1644 struct mbuf *m; 1645 1646 IPSEC_ASSERT(sp != NULL, ("null policy")); 1647 1648 tlen = key_getspreqmsglen(sp); 1649 1650 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0); 1651 if (m == NULL) 1652 return (NULL); 1653 m_align(m, tlen); 1654 m->m_len = tlen; 1655 xpl = mtod(m, struct sadb_x_policy *); 1656 bzero(xpl, tlen); 1657 1658 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1659 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1660 xpl->sadb_x_policy_type = sp->policy; 1661 xpl->sadb_x_policy_dir = sp->spidx.dir; 1662 xpl->sadb_x_policy_id = sp->id; 1663 p = (caddr_t)xpl + sizeof(*xpl); 1664 1665 /* if is the policy for ipsec ? */ 1666 if (sp->policy == IPSEC_POLICY_IPSEC) { 1667 struct sadb_x_ipsecrequest *xisr; 1668 struct ipsecrequest *isr; 1669 1670 for (isr = sp->req; isr != NULL; isr = isr->next) { 1671 1672 xisr = (struct sadb_x_ipsecrequest *)p; 1673 1674 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1675 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1676 xisr->sadb_x_ipsecrequest_level = isr->level; 1677 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1678 1679 p += sizeof(*xisr); 1680 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1681 p += isr->saidx.src.sa.sa_len; 1682 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1683 p += isr->saidx.src.sa.sa_len; 1684 1685 xisr->sadb_x_ipsecrequest_len = 1686 PFKEY_ALIGN8(sizeof(*xisr) 1687 + isr->saidx.src.sa.sa_len 1688 + isr->saidx.dst.sa.sa_len); 1689 } 1690 } 1691 1692 return m; 1693} 1694 1695/* m will not be freed nor modified */ 1696static struct mbuf * 1697#ifdef __STDC__ 1698key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1699 int ndeep, int nitem, ...) 1700#else 1701key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1702 struct mbuf *m; 1703 const struct sadb_msghdr *mhp; 1704 int ndeep; 1705 int nitem; 1706 va_dcl 1707#endif 1708{ 1709 va_list ap; 1710 int idx; 1711 int i; 1712 struct mbuf *result = NULL, *n; 1713 int len; 1714 1715 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1716 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1717 1718 va_start(ap, nitem); 1719 for (i = 0; i < nitem; i++) { 1720 idx = va_arg(ap, int); 1721 if (idx < 0 || idx > SADB_EXT_MAX) 1722 goto fail; 1723 /* don't attempt to pull empty extension */ 1724 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1725 continue; 1726 if (idx != SADB_EXT_RESERVED && 1727 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1728 continue; 1729 1730 if (idx == SADB_EXT_RESERVED) { 1731 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1732 1733 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1734 1735 MGETHDR(n, M_NOWAIT, MT_DATA); 1736 if (!n) 1737 goto fail; 1738 n->m_len = len; 1739 n->m_next = NULL; 1740 m_copydata(m, 0, sizeof(struct sadb_msg), 1741 mtod(n, caddr_t)); 1742 } else if (i < ndeep) { 1743 len = mhp->extlen[idx]; 1744 n = m_get2(len, M_NOWAIT, MT_DATA, 0); 1745 if (n == NULL) 1746 goto fail; 1747 m_align(n, len); 1748 n->m_len = len; 1749 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1750 mtod(n, caddr_t)); 1751 } else { 1752 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1753 M_NOWAIT); 1754 } 1755 if (n == NULL) 1756 goto fail; 1757 1758 if (result) 1759 m_cat(result, n); 1760 else 1761 result = n; 1762 } 1763 va_end(ap); 1764 1765 if ((result->m_flags & M_PKTHDR) != 0) { 1766 result->m_pkthdr.len = 0; 1767 for (n = result; n; n = n->m_next) 1768 result->m_pkthdr.len += n->m_len; 1769 } 1770 1771 return result; 1772 1773fail: 1774 m_freem(result); 1775 va_end(ap); 1776 return NULL; 1777} 1778 1779/* 1780 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1781 * add an entry to SP database, when received 1782 * <base, address(SD), (lifetime(H),) policy> 1783 * from the user(?). 1784 * Adding to SP database, 1785 * and send 1786 * <base, address(SD), (lifetime(H),) policy> 1787 * to the socket which was send. 1788 * 1789 * SPDADD set a unique policy entry. 1790 * SPDSETIDX like SPDADD without a part of policy requests. 1791 * SPDUPDATE replace a unique policy entry. 1792 * 1793 * m will always be freed. 1794 */ 1795static int 1796key_spdadd(so, m, mhp) 1797 struct socket *so; 1798 struct mbuf *m; 1799 const struct sadb_msghdr *mhp; 1800{ 1801 struct sadb_address *src0, *dst0; 1802 struct sadb_x_policy *xpl0, *xpl; 1803 struct sadb_lifetime *lft = NULL; 1804 struct secpolicyindex spidx; 1805 struct secpolicy *newsp; 1806 int error; 1807 1808 IPSEC_ASSERT(so != NULL, ("null socket")); 1809 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1810 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1811 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1812 1813 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1814 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1815 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1816 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1817 return key_senderror(so, m, EINVAL); 1818 } 1819 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1820 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1821 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1822 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1823 __func__)); 1824 return key_senderror(so, m, EINVAL); 1825 } 1826 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1827 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1828 < sizeof(struct sadb_lifetime)) { 1829 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1830 __func__)); 1831 return key_senderror(so, m, EINVAL); 1832 } 1833 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1834 } 1835 1836 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1837 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1838 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1839 1840 /* 1841 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1842 * we are processing traffic endpoints. 1843 */ 1844 1845 /* make secindex */ 1846 /* XXX boundary check against sa_len */ 1847 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1848 src0 + 1, 1849 dst0 + 1, 1850 src0->sadb_address_prefixlen, 1851 dst0->sadb_address_prefixlen, 1852 src0->sadb_address_proto, 1853 &spidx); 1854 1855 /* checking the direciton. */ 1856 switch (xpl0->sadb_x_policy_dir) { 1857 case IPSEC_DIR_INBOUND: 1858 case IPSEC_DIR_OUTBOUND: 1859 break; 1860 default: 1861 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1862 mhp->msg->sadb_msg_errno = EINVAL; 1863 return 0; 1864 } 1865 1866 /* check policy */ 1867 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1868 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1869 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1870 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1871 return key_senderror(so, m, EINVAL); 1872 } 1873 1874 /* policy requests are mandatory when action is ipsec. */ 1875 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1876 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1877 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1878 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1879 __func__)); 1880 return key_senderror(so, m, EINVAL); 1881 } 1882 1883 /* 1884 * checking there is SP already or not. 1885 * SPDUPDATE doesn't depend on whether there is a SP or not. 1886 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1887 * then error. 1888 */ 1889 newsp = key_getsp(&spidx); 1890 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1891 if (newsp) { 1892 SPTREE_LOCK(); 1893 newsp->state = IPSEC_SPSTATE_DEAD; 1894 SPTREE_UNLOCK(); 1895 KEY_FREESP(&newsp); 1896 } 1897 } else { 1898 if (newsp != NULL) { 1899 KEY_FREESP(&newsp); 1900 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1901 __func__)); 1902 return key_senderror(so, m, EEXIST); 1903 } 1904 } 1905 1906 /* allocation new SP entry */ 1907 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1908 return key_senderror(so, m, error); 1909 } 1910 1911 if ((newsp->id = key_getnewspid()) == 0) { 1912 _key_delsp(newsp); 1913 return key_senderror(so, m, ENOBUFS); 1914 } 1915 1916 /* XXX boundary check against sa_len */ 1917 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1918 src0 + 1, 1919 dst0 + 1, 1920 src0->sadb_address_prefixlen, 1921 dst0->sadb_address_prefixlen, 1922 src0->sadb_address_proto, 1923 &newsp->spidx); 1924 1925 /* sanity check on addr pair */ 1926 if (((struct sockaddr *)(src0 + 1))->sa_family != 1927 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1928 _key_delsp(newsp); 1929 return key_senderror(so, m, EINVAL); 1930 } 1931 if (((struct sockaddr *)(src0 + 1))->sa_len != 1932 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1933 _key_delsp(newsp); 1934 return key_senderror(so, m, EINVAL); 1935 } 1936#if 1 1937 if (newsp->req && newsp->req->saidx.src.sa.sa_family && newsp->req->saidx.dst.sa.sa_family) { 1938 if (newsp->req->saidx.src.sa.sa_family != newsp->req->saidx.dst.sa.sa_family) { 1939 _key_delsp(newsp); 1940 return key_senderror(so, m, EINVAL); 1941 } 1942 } 1943#endif 1944 1945 newsp->created = time_second; 1946 newsp->lastused = newsp->created; 1947 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1948 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1949 1950 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1951 newsp->state = IPSEC_SPSTATE_ALIVE; 1952 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1953 1954 /* delete the entry in spacqtree */ 1955 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1956 struct secspacq *spacq = key_getspacq(&spidx); 1957 if (spacq != NULL) { 1958 /* reset counter in order to deletion by timehandler. */ 1959 spacq->created = time_second; 1960 spacq->count = 0; 1961 SPACQ_UNLOCK(); 1962 } 1963 } 1964 1965 { 1966 struct mbuf *n, *mpolicy; 1967 struct sadb_msg *newmsg; 1968 int off; 1969 1970 /* 1971 * Note: do not send SADB_X_EXT_NAT_T_* here: 1972 * we are sending traffic endpoints. 1973 */ 1974 1975 /* create new sadb_msg to reply. */ 1976 if (lft) { 1977 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1978 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1979 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1980 } else { 1981 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1982 SADB_X_EXT_POLICY, 1983 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1984 } 1985 if (!n) 1986 return key_senderror(so, m, ENOBUFS); 1987 1988 if (n->m_len < sizeof(*newmsg)) { 1989 n = m_pullup(n, sizeof(*newmsg)); 1990 if (!n) 1991 return key_senderror(so, m, ENOBUFS); 1992 } 1993 newmsg = mtod(n, struct sadb_msg *); 1994 newmsg->sadb_msg_errno = 0; 1995 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1996 1997 off = 0; 1998 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1999 sizeof(*xpl), &off); 2000 if (mpolicy == NULL) { 2001 /* n is already freed */ 2002 return key_senderror(so, m, ENOBUFS); 2003 } 2004 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 2005 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 2006 m_freem(n); 2007 return key_senderror(so, m, EINVAL); 2008 } 2009 xpl->sadb_x_policy_id = newsp->id; 2010 2011 m_freem(m); 2012 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2013 } 2014} 2015 2016/* 2017 * get new policy id. 2018 * OUT: 2019 * 0: failure. 2020 * others: success. 2021 */ 2022static u_int32_t 2023key_getnewspid() 2024{ 2025 u_int32_t newid = 0; 2026 int count = V_key_spi_trycnt; /* XXX */ 2027 struct secpolicy *sp; 2028 2029 /* when requesting to allocate spi ranged */ 2030 while (count--) { 2031 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2032 2033 if ((sp = key_getspbyid(newid)) == NULL) 2034 break; 2035 2036 KEY_FREESP(&sp); 2037 } 2038 2039 if (count == 0 || newid == 0) { 2040 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2041 __func__)); 2042 return 0; 2043 } 2044 2045 return newid; 2046} 2047 2048/* 2049 * SADB_SPDDELETE processing 2050 * receive 2051 * <base, address(SD), policy(*)> 2052 * from the user(?), and set SADB_SASTATE_DEAD, 2053 * and send, 2054 * <base, address(SD), policy(*)> 2055 * to the ikmpd. 2056 * policy(*) including direction of policy. 2057 * 2058 * m will always be freed. 2059 */ 2060static int 2061key_spddelete(so, m, mhp) 2062 struct socket *so; 2063 struct mbuf *m; 2064 const struct sadb_msghdr *mhp; 2065{ 2066 struct sadb_address *src0, *dst0; 2067 struct sadb_x_policy *xpl0; 2068 struct secpolicyindex spidx; 2069 struct secpolicy *sp; 2070 2071 IPSEC_ASSERT(so != NULL, ("null so")); 2072 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2073 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2074 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2075 2076 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2077 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2078 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2079 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2080 __func__)); 2081 return key_senderror(so, m, EINVAL); 2082 } 2083 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2084 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2085 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2086 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2087 __func__)); 2088 return key_senderror(so, m, EINVAL); 2089 } 2090 2091 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2092 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2093 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2094 2095 /* 2096 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2097 * we are processing traffic endpoints. 2098 */ 2099 2100 /* make secindex */ 2101 /* XXX boundary check against sa_len */ 2102 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2103 src0 + 1, 2104 dst0 + 1, 2105 src0->sadb_address_prefixlen, 2106 dst0->sadb_address_prefixlen, 2107 src0->sadb_address_proto, 2108 &spidx); 2109 2110 /* checking the direciton. */ 2111 switch (xpl0->sadb_x_policy_dir) { 2112 case IPSEC_DIR_INBOUND: 2113 case IPSEC_DIR_OUTBOUND: 2114 break; 2115 default: 2116 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2117 return key_senderror(so, m, EINVAL); 2118 } 2119 2120 /* Is there SP in SPD ? */ 2121 if ((sp = key_getsp(&spidx)) == NULL) { 2122 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2123 return key_senderror(so, m, EINVAL); 2124 } 2125 2126 /* save policy id to buffer to be returned. */ 2127 xpl0->sadb_x_policy_id = sp->id; 2128 2129 SPTREE_LOCK(); 2130 sp->state = IPSEC_SPSTATE_DEAD; 2131 SPTREE_UNLOCK(); 2132 KEY_FREESP(&sp); 2133 2134 { 2135 struct mbuf *n; 2136 struct sadb_msg *newmsg; 2137 2138 /* 2139 * Note: do not send SADB_X_EXT_NAT_T_* here: 2140 * we are sending traffic endpoints. 2141 */ 2142 2143 /* create new sadb_msg to reply. */ 2144 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2145 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2146 if (!n) 2147 return key_senderror(so, m, ENOBUFS); 2148 2149 newmsg = mtod(n, struct sadb_msg *); 2150 newmsg->sadb_msg_errno = 0; 2151 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2152 2153 m_freem(m); 2154 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2155 } 2156} 2157 2158/* 2159 * SADB_SPDDELETE2 processing 2160 * receive 2161 * <base, policy(*)> 2162 * from the user(?), and set SADB_SASTATE_DEAD, 2163 * and send, 2164 * <base, policy(*)> 2165 * to the ikmpd. 2166 * policy(*) including direction of policy. 2167 * 2168 * m will always be freed. 2169 */ 2170static int 2171key_spddelete2(so, m, mhp) 2172 struct socket *so; 2173 struct mbuf *m; 2174 const struct sadb_msghdr *mhp; 2175{ 2176 u_int32_t id; 2177 struct secpolicy *sp; 2178 2179 IPSEC_ASSERT(so != NULL, ("null socket")); 2180 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2181 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2182 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2183 2184 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2185 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2186 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2187 return key_senderror(so, m, EINVAL); 2188 } 2189 2190 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2191 2192 /* Is there SP in SPD ? */ 2193 if ((sp = key_getspbyid(id)) == NULL) { 2194 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2195 return key_senderror(so, m, EINVAL); 2196 } 2197 2198 SPTREE_LOCK(); 2199 sp->state = IPSEC_SPSTATE_DEAD; 2200 SPTREE_UNLOCK(); 2201 KEY_FREESP(&sp); 2202 2203 { 2204 struct mbuf *n, *nn; 2205 struct sadb_msg *newmsg; 2206 int off, len; 2207 2208 /* create new sadb_msg to reply. */ 2209 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2210 2211 MGETHDR(n, M_NOWAIT, MT_DATA); 2212 if (n && len > MHLEN) { 2213 MCLGET(n, M_NOWAIT); 2214 if ((n->m_flags & M_EXT) == 0) { 2215 m_freem(n); 2216 n = NULL; 2217 } 2218 } 2219 if (!n) 2220 return key_senderror(so, m, ENOBUFS); 2221 2222 n->m_len = len; 2223 n->m_next = NULL; 2224 off = 0; 2225 2226 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2227 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2228 2229 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2230 off, len)); 2231 2232 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2233 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT); 2234 if (!n->m_next) { 2235 m_freem(n); 2236 return key_senderror(so, m, ENOBUFS); 2237 } 2238 2239 n->m_pkthdr.len = 0; 2240 for (nn = n; nn; nn = nn->m_next) 2241 n->m_pkthdr.len += nn->m_len; 2242 2243 newmsg = mtod(n, struct sadb_msg *); 2244 newmsg->sadb_msg_errno = 0; 2245 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2246 2247 m_freem(m); 2248 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2249 } 2250} 2251 2252/* 2253 * SADB_X_GET processing 2254 * receive 2255 * <base, policy(*)> 2256 * from the user(?), 2257 * and send, 2258 * <base, address(SD), policy> 2259 * to the ikmpd. 2260 * policy(*) including direction of policy. 2261 * 2262 * m will always be freed. 2263 */ 2264static int 2265key_spdget(so, m, mhp) 2266 struct socket *so; 2267 struct mbuf *m; 2268 const struct sadb_msghdr *mhp; 2269{ 2270 u_int32_t id; 2271 struct secpolicy *sp; 2272 struct mbuf *n; 2273 2274 IPSEC_ASSERT(so != NULL, ("null socket")); 2275 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2276 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2277 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2278 2279 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2280 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2281 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2282 __func__)); 2283 return key_senderror(so, m, EINVAL); 2284 } 2285 2286 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2287 2288 /* Is there SP in SPD ? */ 2289 if ((sp = key_getspbyid(id)) == NULL) { 2290 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2291 return key_senderror(so, m, ENOENT); 2292 } 2293 2294 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2295 KEY_FREESP(&sp); 2296 if (n != NULL) { 2297 m_freem(m); 2298 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2299 } else 2300 return key_senderror(so, m, ENOBUFS); 2301} 2302 2303/* 2304 * SADB_X_SPDACQUIRE processing. 2305 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2306 * send 2307 * <base, policy(*)> 2308 * to KMD, and expect to receive 2309 * <base> with SADB_X_SPDACQUIRE if error occured, 2310 * or 2311 * <base, policy> 2312 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2313 * policy(*) is without policy requests. 2314 * 2315 * 0 : succeed 2316 * others: error number 2317 */ 2318int 2319key_spdacquire(sp) 2320 struct secpolicy *sp; 2321{ 2322 struct mbuf *result = NULL, *m; 2323 struct secspacq *newspacq; 2324 2325 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2326 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2327 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2328 ("policy not IPSEC %u", sp->policy)); 2329 2330 /* Get an entry to check whether sent message or not. */ 2331 newspacq = key_getspacq(&sp->spidx); 2332 if (newspacq != NULL) { 2333 if (V_key_blockacq_count < newspacq->count) { 2334 /* reset counter and do send message. */ 2335 newspacq->count = 0; 2336 } else { 2337 /* increment counter and do nothing. */ 2338 newspacq->count++; 2339 SPACQ_UNLOCK(); 2340 return (0); 2341 } 2342 SPACQ_UNLOCK(); 2343 } else { 2344 /* make new entry for blocking to send SADB_ACQUIRE. */ 2345 newspacq = key_newspacq(&sp->spidx); 2346 if (newspacq == NULL) 2347 return ENOBUFS; 2348 } 2349 2350 /* create new sadb_msg to reply. */ 2351 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2352 if (!m) 2353 return ENOBUFS; 2354 2355 result = m; 2356 2357 result->m_pkthdr.len = 0; 2358 for (m = result; m; m = m->m_next) 2359 result->m_pkthdr.len += m->m_len; 2360 2361 mtod(result, struct sadb_msg *)->sadb_msg_len = 2362 PFKEY_UNIT64(result->m_pkthdr.len); 2363 2364 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2365} 2366 2367/* 2368 * SADB_SPDFLUSH processing 2369 * receive 2370 * <base> 2371 * from the user, and free all entries in secpctree. 2372 * and send, 2373 * <base> 2374 * to the user. 2375 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2376 * 2377 * m will always be freed. 2378 */ 2379static int 2380key_spdflush(so, m, mhp) 2381 struct socket *so; 2382 struct mbuf *m; 2383 const struct sadb_msghdr *mhp; 2384{ 2385 struct sadb_msg *newmsg; 2386 struct secpolicy *sp; 2387 u_int dir; 2388 2389 IPSEC_ASSERT(so != NULL, ("null socket")); 2390 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2391 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2392 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2393 2394 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2395 return key_senderror(so, m, EINVAL); 2396 2397 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2398 SPTREE_LOCK(); 2399 LIST_FOREACH(sp, &V_sptree[dir], chain) 2400 sp->state = IPSEC_SPSTATE_DEAD; 2401 SPTREE_UNLOCK(); 2402 } 2403 2404 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2405 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2406 return key_senderror(so, m, ENOBUFS); 2407 } 2408 2409 if (m->m_next) 2410 m_freem(m->m_next); 2411 m->m_next = NULL; 2412 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2413 newmsg = mtod(m, struct sadb_msg *); 2414 newmsg->sadb_msg_errno = 0; 2415 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2416 2417 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2418} 2419 2420/* 2421 * SADB_SPDDUMP processing 2422 * receive 2423 * <base> 2424 * from the user, and dump all SP leaves 2425 * and send, 2426 * <base> ..... 2427 * to the ikmpd. 2428 * 2429 * m will always be freed. 2430 */ 2431static int 2432key_spddump(so, m, mhp) 2433 struct socket *so; 2434 struct mbuf *m; 2435 const struct sadb_msghdr *mhp; 2436{ 2437 struct secpolicy *sp; 2438 int cnt; 2439 u_int dir; 2440 struct mbuf *n; 2441 2442 IPSEC_ASSERT(so != NULL, ("null socket")); 2443 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2444 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2445 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2446 2447 /* search SPD entry and get buffer size. */ 2448 cnt = 0; 2449 SPTREE_LOCK(); 2450 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2451 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2452 cnt++; 2453 } 2454 } 2455 2456 if (cnt == 0) { 2457 SPTREE_UNLOCK(); 2458 return key_senderror(so, m, ENOENT); 2459 } 2460 2461 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2462 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2463 --cnt; 2464 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2465 mhp->msg->sadb_msg_pid); 2466 2467 if (n) 2468 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2469 } 2470 } 2471 2472 SPTREE_UNLOCK(); 2473 m_freem(m); 2474 return 0; 2475} 2476 2477static struct mbuf * 2478key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2479{ 2480 struct mbuf *result = NULL, *m; 2481 struct seclifetime lt; 2482 2483 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2484 if (!m) 2485 goto fail; 2486 result = m; 2487 2488 /* 2489 * Note: do not send SADB_X_EXT_NAT_T_* here: 2490 * we are sending traffic endpoints. 2491 */ 2492 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2493 &sp->spidx.src.sa, sp->spidx.prefs, 2494 sp->spidx.ul_proto); 2495 if (!m) 2496 goto fail; 2497 m_cat(result, m); 2498 2499 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2500 &sp->spidx.dst.sa, sp->spidx.prefd, 2501 sp->spidx.ul_proto); 2502 if (!m) 2503 goto fail; 2504 m_cat(result, m); 2505 2506 m = key_sp2msg(sp); 2507 if (!m) 2508 goto fail; 2509 m_cat(result, m); 2510 2511 if(sp->lifetime){ 2512 lt.addtime=sp->created; 2513 lt.usetime= sp->lastused; 2514 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2515 if (!m) 2516 goto fail; 2517 m_cat(result, m); 2518 2519 lt.addtime=sp->lifetime; 2520 lt.usetime= sp->validtime; 2521 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2522 if (!m) 2523 goto fail; 2524 m_cat(result, m); 2525 } 2526 2527 if ((result->m_flags & M_PKTHDR) == 0) 2528 goto fail; 2529 2530 if (result->m_len < sizeof(struct sadb_msg)) { 2531 result = m_pullup(result, sizeof(struct sadb_msg)); 2532 if (result == NULL) 2533 goto fail; 2534 } 2535 2536 result->m_pkthdr.len = 0; 2537 for (m = result; m; m = m->m_next) 2538 result->m_pkthdr.len += m->m_len; 2539 2540 mtod(result, struct sadb_msg *)->sadb_msg_len = 2541 PFKEY_UNIT64(result->m_pkthdr.len); 2542 2543 return result; 2544 2545fail: 2546 m_freem(result); 2547 return NULL; 2548} 2549 2550/* 2551 * get PFKEY message length for security policy and request. 2552 */ 2553static u_int 2554key_getspreqmsglen(sp) 2555 struct secpolicy *sp; 2556{ 2557 u_int tlen; 2558 2559 tlen = sizeof(struct sadb_x_policy); 2560 2561 /* if is the policy for ipsec ? */ 2562 if (sp->policy != IPSEC_POLICY_IPSEC) 2563 return tlen; 2564 2565 /* get length of ipsec requests */ 2566 { 2567 struct ipsecrequest *isr; 2568 int len; 2569 2570 for (isr = sp->req; isr != NULL; isr = isr->next) { 2571 len = sizeof(struct sadb_x_ipsecrequest) 2572 + isr->saidx.src.sa.sa_len 2573 + isr->saidx.dst.sa.sa_len; 2574 2575 tlen += PFKEY_ALIGN8(len); 2576 } 2577 } 2578 2579 return tlen; 2580} 2581 2582/* 2583 * SADB_SPDEXPIRE processing 2584 * send 2585 * <base, address(SD), lifetime(CH), policy> 2586 * to KMD by PF_KEY. 2587 * 2588 * OUT: 0 : succeed 2589 * others : error number 2590 */ 2591static int 2592key_spdexpire(sp) 2593 struct secpolicy *sp; 2594{ 2595 struct mbuf *result = NULL, *m; 2596 int len; 2597 int error = -1; 2598 struct sadb_lifetime *lt; 2599 2600 /* XXX: Why do we lock ? */ 2601 2602 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2603 2604 /* set msg header */ 2605 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2606 if (!m) { 2607 error = ENOBUFS; 2608 goto fail; 2609 } 2610 result = m; 2611 2612 /* create lifetime extension (current and hard) */ 2613 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2614 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 2615 if (m == NULL) { 2616 error = ENOBUFS; 2617 goto fail; 2618 } 2619 m_align(m, len); 2620 m->m_len = len; 2621 bzero(mtod(m, caddr_t), len); 2622 lt = mtod(m, struct sadb_lifetime *); 2623 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2624 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2625 lt->sadb_lifetime_allocations = 0; 2626 lt->sadb_lifetime_bytes = 0; 2627 lt->sadb_lifetime_addtime = sp->created; 2628 lt->sadb_lifetime_usetime = sp->lastused; 2629 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2630 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2631 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2632 lt->sadb_lifetime_allocations = 0; 2633 lt->sadb_lifetime_bytes = 0; 2634 lt->sadb_lifetime_addtime = sp->lifetime; 2635 lt->sadb_lifetime_usetime = sp->validtime; 2636 m_cat(result, m); 2637 2638 /* 2639 * Note: do not send SADB_X_EXT_NAT_T_* here: 2640 * we are sending traffic endpoints. 2641 */ 2642 2643 /* set sadb_address for source */ 2644 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2645 &sp->spidx.src.sa, 2646 sp->spidx.prefs, sp->spidx.ul_proto); 2647 if (!m) { 2648 error = ENOBUFS; 2649 goto fail; 2650 } 2651 m_cat(result, m); 2652 2653 /* set sadb_address for destination */ 2654 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2655 &sp->spidx.dst.sa, 2656 sp->spidx.prefd, sp->spidx.ul_proto); 2657 if (!m) { 2658 error = ENOBUFS; 2659 goto fail; 2660 } 2661 m_cat(result, m); 2662 2663 /* set secpolicy */ 2664 m = key_sp2msg(sp); 2665 if (!m) { 2666 error = ENOBUFS; 2667 goto fail; 2668 } 2669 m_cat(result, m); 2670 2671 if ((result->m_flags & M_PKTHDR) == 0) { 2672 error = EINVAL; 2673 goto fail; 2674 } 2675 2676 if (result->m_len < sizeof(struct sadb_msg)) { 2677 result = m_pullup(result, sizeof(struct sadb_msg)); 2678 if (result == NULL) { 2679 error = ENOBUFS; 2680 goto fail; 2681 } 2682 } 2683 2684 result->m_pkthdr.len = 0; 2685 for (m = result; m; m = m->m_next) 2686 result->m_pkthdr.len += m->m_len; 2687 2688 mtod(result, struct sadb_msg *)->sadb_msg_len = 2689 PFKEY_UNIT64(result->m_pkthdr.len); 2690 2691 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2692 2693 fail: 2694 if (result) 2695 m_freem(result); 2696 return error; 2697} 2698 2699/* %%% SAD management */ 2700/* 2701 * allocating a memory for new SA head, and copy from the values of mhp. 2702 * OUT: NULL : failure due to the lack of memory. 2703 * others : pointer to new SA head. 2704 */ 2705static struct secashead * 2706key_newsah(saidx) 2707 struct secasindex *saidx; 2708{ 2709 struct secashead *newsah; 2710 2711 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2712 2713 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2714 if (newsah != NULL) { 2715 int i; 2716 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2717 LIST_INIT(&newsah->savtree[i]); 2718 newsah->saidx = *saidx; 2719 2720 /* add to saidxtree */ 2721 newsah->state = SADB_SASTATE_MATURE; 2722 2723 SAHTREE_LOCK(); 2724 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2725 SAHTREE_UNLOCK(); 2726 } 2727 return(newsah); 2728} 2729 2730/* 2731 * delete SA index and all SA registerd. 2732 */ 2733static void 2734key_delsah(sah) 2735 struct secashead *sah; 2736{ 2737 struct secasvar *sav, *nextsav; 2738 u_int stateidx; 2739 int zombie = 0; 2740 2741 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2742 SAHTREE_LOCK_ASSERT(); 2743 2744 /* searching all SA registerd in the secindex. */ 2745 for (stateidx = 0; 2746 stateidx < _ARRAYLEN(saorder_state_any); 2747 stateidx++) { 2748 u_int state = saorder_state_any[stateidx]; 2749 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2750 if (sav->refcnt == 0) { 2751 /* sanity check */ 2752 KEY_CHKSASTATE(state, sav->state, __func__); 2753 /* 2754 * do NOT call KEY_FREESAV here: 2755 * it will only delete the sav if refcnt == 1, 2756 * where we already know that refcnt == 0 2757 */ 2758 key_delsav(sav); 2759 } else { 2760 /* give up to delete this sa */ 2761 zombie++; 2762 } 2763 } 2764 } 2765 if (!zombie) { /* delete only if there are savs */ 2766 /* remove from tree of SA index */ 2767 if (__LIST_CHAINED(sah)) 2768 LIST_REMOVE(sah, chain); 2769 if (sah->route_cache.sa_route.ro_rt) { 2770 RTFREE(sah->route_cache.sa_route.ro_rt); 2771 sah->route_cache.sa_route.ro_rt = (struct rtentry *)NULL; 2772 } 2773 free(sah, M_IPSEC_SAH); 2774 } 2775} 2776 2777/* 2778 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2779 * and copy the values of mhp into new buffer. 2780 * When SAD message type is GETSPI: 2781 * to set sequence number from acq_seq++, 2782 * to set zero to SPI. 2783 * not to call key_setsava(). 2784 * OUT: NULL : fail 2785 * others : pointer to new secasvar. 2786 * 2787 * does not modify mbuf. does not free mbuf on error. 2788 */ 2789static struct secasvar * 2790key_newsav(m, mhp, sah, errp, where, tag) 2791 struct mbuf *m; 2792 const struct sadb_msghdr *mhp; 2793 struct secashead *sah; 2794 int *errp; 2795 const char* where; 2796 int tag; 2797{ 2798 struct secasvar *newsav; 2799 const struct sadb_sa *xsa; 2800 2801 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2802 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2803 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2804 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2805 2806 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2807 if (newsav == NULL) { 2808 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2809 *errp = ENOBUFS; 2810 goto done; 2811 } 2812 2813 switch (mhp->msg->sadb_msg_type) { 2814 case SADB_GETSPI: 2815 newsav->spi = 0; 2816 2817#ifdef IPSEC_DOSEQCHECK 2818 /* sync sequence number */ 2819 if (mhp->msg->sadb_msg_seq == 0) 2820 newsav->seq = 2821 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2822 else 2823#endif 2824 newsav->seq = mhp->msg->sadb_msg_seq; 2825 break; 2826 2827 case SADB_ADD: 2828 /* sanity check */ 2829 if (mhp->ext[SADB_EXT_SA] == NULL) { 2830 free(newsav, M_IPSEC_SA); 2831 newsav = NULL; 2832 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2833 __func__)); 2834 *errp = EINVAL; 2835 goto done; 2836 } 2837 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2838 newsav->spi = xsa->sadb_sa_spi; 2839 newsav->seq = mhp->msg->sadb_msg_seq; 2840 break; 2841 default: 2842 free(newsav, M_IPSEC_SA); 2843 newsav = NULL; 2844 *errp = EINVAL; 2845 goto done; 2846 } 2847 2848 2849 /* copy sav values */ 2850 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2851 *errp = key_setsaval(newsav, m, mhp); 2852 if (*errp) { 2853 free(newsav, M_IPSEC_SA); 2854 newsav = NULL; 2855 goto done; 2856 } 2857 } 2858 2859 SECASVAR_LOCK_INIT(newsav); 2860 2861 /* reset created */ 2862 newsav->created = time_second; 2863 newsav->pid = mhp->msg->sadb_msg_pid; 2864 2865 /* add to satree */ 2866 newsav->sah = sah; 2867 sa_initref(newsav); 2868 newsav->state = SADB_SASTATE_LARVAL; 2869 2870 SAHTREE_LOCK(); 2871 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2872 secasvar, chain); 2873 SAHTREE_UNLOCK(); 2874done: 2875 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2876 printf("DP %s from %s:%u return SP:%p\n", __func__, 2877 where, tag, newsav)); 2878 2879 return newsav; 2880} 2881 2882/* 2883 * free() SA variable entry. 2884 */ 2885static void 2886key_cleansav(struct secasvar *sav) 2887{ 2888 /* 2889 * Cleanup xform state. Note that zeroize'ing causes the 2890 * keys to be cleared; otherwise we must do it ourself. 2891 */ 2892 if (sav->tdb_xform != NULL) { 2893 sav->tdb_xform->xf_zeroize(sav); 2894 sav->tdb_xform = NULL; 2895 } else { 2896 KASSERT(sav->iv == NULL, ("iv but no xform")); 2897 if (sav->key_auth != NULL) 2898 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2899 if (sav->key_enc != NULL) 2900 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2901 } 2902 if (sav->key_auth != NULL) { 2903 if (sav->key_auth->key_data != NULL) 2904 free(sav->key_auth->key_data, M_IPSEC_MISC); 2905 free(sav->key_auth, M_IPSEC_MISC); 2906 sav->key_auth = NULL; 2907 } 2908 if (sav->key_enc != NULL) { 2909 if (sav->key_enc->key_data != NULL) 2910 free(sav->key_enc->key_data, M_IPSEC_MISC); 2911 free(sav->key_enc, M_IPSEC_MISC); 2912 sav->key_enc = NULL; 2913 } 2914 if (sav->sched) { 2915 bzero(sav->sched, sav->schedlen); 2916 free(sav->sched, M_IPSEC_MISC); 2917 sav->sched = NULL; 2918 } 2919 if (sav->replay != NULL) { 2920 free(sav->replay, M_IPSEC_MISC); 2921 sav->replay = NULL; 2922 } 2923 if (sav->lft_c != NULL) { 2924 free(sav->lft_c, M_IPSEC_MISC); 2925 sav->lft_c = NULL; 2926 } 2927 if (sav->lft_h != NULL) { 2928 free(sav->lft_h, M_IPSEC_MISC); 2929 sav->lft_h = NULL; 2930 } 2931 if (sav->lft_s != NULL) { 2932 free(sav->lft_s, M_IPSEC_MISC); 2933 sav->lft_s = NULL; 2934 } 2935} 2936 2937/* 2938 * free() SA variable entry. 2939 */ 2940static void 2941key_delsav(sav) 2942 struct secasvar *sav; 2943{ 2944 IPSEC_ASSERT(sav != NULL, ("null sav")); 2945 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2946 2947 /* remove from SA header */ 2948 if (__LIST_CHAINED(sav)) 2949 LIST_REMOVE(sav, chain); 2950 key_cleansav(sav); 2951 SECASVAR_LOCK_DESTROY(sav); 2952 free(sav, M_IPSEC_SA); 2953} 2954 2955/* 2956 * search SAD. 2957 * OUT: 2958 * NULL : not found 2959 * others : found, pointer to a SA. 2960 */ 2961static struct secashead * 2962key_getsah(saidx) 2963 struct secasindex *saidx; 2964{ 2965 struct secashead *sah; 2966 2967 SAHTREE_LOCK(); 2968 LIST_FOREACH(sah, &V_sahtree, chain) { 2969 if (sah->state == SADB_SASTATE_DEAD) 2970 continue; 2971 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2972 break; 2973 } 2974 SAHTREE_UNLOCK(); 2975 2976 return sah; 2977} 2978 2979/* 2980 * check not to be duplicated SPI. 2981 * NOTE: this function is too slow due to searching all SAD. 2982 * OUT: 2983 * NULL : not found 2984 * others : found, pointer to a SA. 2985 */ 2986static struct secasvar * 2987key_checkspidup(saidx, spi) 2988 struct secasindex *saidx; 2989 u_int32_t spi; 2990{ 2991 struct secashead *sah; 2992 struct secasvar *sav; 2993 2994 /* check address family */ 2995 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2996 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2997 __func__)); 2998 return NULL; 2999 } 3000 3001 sav = NULL; 3002 /* check all SAD */ 3003 SAHTREE_LOCK(); 3004 LIST_FOREACH(sah, &V_sahtree, chain) { 3005 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 3006 continue; 3007 sav = key_getsavbyspi(sah, spi); 3008 if (sav != NULL) 3009 break; 3010 } 3011 SAHTREE_UNLOCK(); 3012 3013 return sav; 3014} 3015 3016/* 3017 * search SAD litmited alive SA, protocol, SPI. 3018 * OUT: 3019 * NULL : not found 3020 * others : found, pointer to a SA. 3021 */ 3022static struct secasvar * 3023key_getsavbyspi(sah, spi) 3024 struct secashead *sah; 3025 u_int32_t spi; 3026{ 3027 struct secasvar *sav; 3028 u_int stateidx, state; 3029 3030 sav = NULL; 3031 SAHTREE_LOCK_ASSERT(); 3032 /* search all status */ 3033 for (stateidx = 0; 3034 stateidx < _ARRAYLEN(saorder_state_alive); 3035 stateidx++) { 3036 3037 state = saorder_state_alive[stateidx]; 3038 LIST_FOREACH(sav, &sah->savtree[state], chain) { 3039 3040 /* sanity check */ 3041 if (sav->state != state) { 3042 ipseclog((LOG_DEBUG, "%s: " 3043 "invalid sav->state (queue: %d SA: %d)\n", 3044 __func__, state, sav->state)); 3045 continue; 3046 } 3047 3048 if (sav->spi == spi) 3049 return sav; 3050 } 3051 } 3052 3053 return NULL; 3054} 3055 3056/* 3057 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3058 * You must update these if need. 3059 * OUT: 0: success. 3060 * !0: failure. 3061 * 3062 * does not modify mbuf. does not free mbuf on error. 3063 */ 3064static int 3065key_setsaval(sav, m, mhp) 3066 struct secasvar *sav; 3067 struct mbuf *m; 3068 const struct sadb_msghdr *mhp; 3069{ 3070 int error = 0; 3071 3072 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3073 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3074 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3075 3076 /* initialization */ 3077 sav->replay = NULL; 3078 sav->key_auth = NULL; 3079 sav->key_enc = NULL; 3080 sav->sched = NULL; 3081 sav->schedlen = 0; 3082 sav->iv = NULL; 3083 sav->lft_c = NULL; 3084 sav->lft_h = NULL; 3085 sav->lft_s = NULL; 3086 sav->tdb_xform = NULL; /* transform */ 3087 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3088 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3089 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3090 /* Initialize even if NAT-T not compiled in: */ 3091 sav->natt_type = 0; 3092 sav->natt_esp_frag_len = 0; 3093 3094 /* SA */ 3095 if (mhp->ext[SADB_EXT_SA] != NULL) { 3096 const struct sadb_sa *sa0; 3097 3098 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3099 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3100 error = EINVAL; 3101 goto fail; 3102 } 3103 3104 sav->alg_auth = sa0->sadb_sa_auth; 3105 sav->alg_enc = sa0->sadb_sa_encrypt; 3106 sav->flags = sa0->sadb_sa_flags; 3107 3108 /* replay window */ 3109 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3110 sav->replay = (struct secreplay *) 3111 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3112 if (sav->replay == NULL) { 3113 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3114 __func__)); 3115 error = ENOBUFS; 3116 goto fail; 3117 } 3118 if (sa0->sadb_sa_replay != 0) 3119 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3120 sav->replay->wsize = sa0->sadb_sa_replay; 3121 } 3122 } 3123 3124 /* Authentication keys */ 3125 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3126 const struct sadb_key *key0; 3127 int len; 3128 3129 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3130 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3131 3132 error = 0; 3133 if (len < sizeof(*key0)) { 3134 error = EINVAL; 3135 goto fail; 3136 } 3137 switch (mhp->msg->sadb_msg_satype) { 3138 case SADB_SATYPE_AH: 3139 case SADB_SATYPE_ESP: 3140 case SADB_X_SATYPE_TCPSIGNATURE: 3141 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3142 sav->alg_auth != SADB_X_AALG_NULL) 3143 error = EINVAL; 3144 break; 3145 case SADB_X_SATYPE_IPCOMP: 3146 default: 3147 error = EINVAL; 3148 break; 3149 } 3150 if (error) { 3151 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3152 __func__)); 3153 goto fail; 3154 } 3155 3156 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3157 M_IPSEC_MISC); 3158 if (sav->key_auth == NULL ) { 3159 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3160 __func__)); 3161 error = ENOBUFS; 3162 goto fail; 3163 } 3164 } 3165 3166 /* Encryption key */ 3167 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3168 const struct sadb_key *key0; 3169 int len; 3170 3171 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3172 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3173 3174 error = 0; 3175 if (len < sizeof(*key0)) { 3176 error = EINVAL; 3177 goto fail; 3178 } 3179 switch (mhp->msg->sadb_msg_satype) { 3180 case SADB_SATYPE_ESP: 3181 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3182 sav->alg_enc != SADB_EALG_NULL) { 3183 error = EINVAL; 3184 break; 3185 } 3186 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3187 len, 3188 M_IPSEC_MISC); 3189 if (sav->key_enc == NULL) { 3190 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3191 __func__)); 3192 error = ENOBUFS; 3193 goto fail; 3194 } 3195 break; 3196 case SADB_X_SATYPE_IPCOMP: 3197 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3198 error = EINVAL; 3199 sav->key_enc = NULL; /*just in case*/ 3200 break; 3201 case SADB_SATYPE_AH: 3202 case SADB_X_SATYPE_TCPSIGNATURE: 3203 default: 3204 error = EINVAL; 3205 break; 3206 } 3207 if (error) { 3208 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3209 __func__)); 3210 goto fail; 3211 } 3212 } 3213 3214 /* set iv */ 3215 sav->ivlen = 0; 3216 3217 switch (mhp->msg->sadb_msg_satype) { 3218 case SADB_SATYPE_AH: 3219 error = xform_init(sav, XF_AH); 3220 break; 3221 case SADB_SATYPE_ESP: 3222 error = xform_init(sav, XF_ESP); 3223 break; 3224 case SADB_X_SATYPE_IPCOMP: 3225 error = xform_init(sav, XF_IPCOMP); 3226 break; 3227 case SADB_X_SATYPE_TCPSIGNATURE: 3228 error = xform_init(sav, XF_TCPSIGNATURE); 3229 break; 3230 } 3231 if (error) { 3232 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3233 __func__, mhp->msg->sadb_msg_satype)); 3234 goto fail; 3235 } 3236 3237 /* reset created */ 3238 sav->created = time_second; 3239 3240 /* make lifetime for CURRENT */ 3241 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3242 if (sav->lft_c == NULL) { 3243 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3244 error = ENOBUFS; 3245 goto fail; 3246 } 3247 3248 sav->lft_c->allocations = 0; 3249 sav->lft_c->bytes = 0; 3250 sav->lft_c->addtime = time_second; 3251 sav->lft_c->usetime = 0; 3252 3253 /* lifetimes for HARD and SOFT */ 3254 { 3255 const struct sadb_lifetime *lft0; 3256 3257 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3258 if (lft0 != NULL) { 3259 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3260 error = EINVAL; 3261 goto fail; 3262 } 3263 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3264 if (sav->lft_h == NULL) { 3265 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3266 error = ENOBUFS; 3267 goto fail; 3268 } 3269 /* to be initialize ? */ 3270 } 3271 3272 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3273 if (lft0 != NULL) { 3274 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3275 error = EINVAL; 3276 goto fail; 3277 } 3278 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3279 if (sav->lft_s == NULL) { 3280 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3281 error = ENOBUFS; 3282 goto fail; 3283 } 3284 /* to be initialize ? */ 3285 } 3286 } 3287 3288 return 0; 3289 3290 fail: 3291 /* initialization */ 3292 key_cleansav(sav); 3293 3294 return error; 3295} 3296 3297/* 3298 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3299 * OUT: 0: valid 3300 * other: errno 3301 */ 3302static int 3303key_mature(struct secasvar *sav) 3304{ 3305 int error; 3306 3307 /* check SPI value */ 3308 switch (sav->sah->saidx.proto) { 3309 case IPPROTO_ESP: 3310 case IPPROTO_AH: 3311 /* 3312 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3313 * 1-255 reserved by IANA for future use, 3314 * 0 for implementation specific, local use. 3315 */ 3316 if (ntohl(sav->spi) <= 255) { 3317 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3318 __func__, (u_int32_t)ntohl(sav->spi))); 3319 return EINVAL; 3320 } 3321 break; 3322 } 3323 3324 /* check satype */ 3325 switch (sav->sah->saidx.proto) { 3326 case IPPROTO_ESP: 3327 /* check flags */ 3328 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3329 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3330 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3331 "given to old-esp.\n", __func__)); 3332 return EINVAL; 3333 } 3334 error = xform_init(sav, XF_ESP); 3335 break; 3336 case IPPROTO_AH: 3337 /* check flags */ 3338 if (sav->flags & SADB_X_EXT_DERIV) { 3339 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3340 "given to AH SA.\n", __func__)); 3341 return EINVAL; 3342 } 3343 if (sav->alg_enc != SADB_EALG_NONE) { 3344 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3345 "mismated.\n", __func__)); 3346 return(EINVAL); 3347 } 3348 error = xform_init(sav, XF_AH); 3349 break; 3350 case IPPROTO_IPCOMP: 3351 if (sav->alg_auth != SADB_AALG_NONE) { 3352 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3353 "mismated.\n", __func__)); 3354 return(EINVAL); 3355 } 3356 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3357 && ntohl(sav->spi) >= 0x10000) { 3358 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3359 __func__)); 3360 return(EINVAL); 3361 } 3362 error = xform_init(sav, XF_IPCOMP); 3363 break; 3364 case IPPROTO_TCP: 3365 if (sav->alg_enc != SADB_EALG_NONE) { 3366 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3367 "mismated.\n", __func__)); 3368 return(EINVAL); 3369 } 3370 error = xform_init(sav, XF_TCPSIGNATURE); 3371 break; 3372 default: 3373 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3374 error = EPROTONOSUPPORT; 3375 break; 3376 } 3377 if (error == 0) { 3378 SAHTREE_LOCK(); 3379 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3380 SAHTREE_UNLOCK(); 3381 } 3382 return (error); 3383} 3384 3385/* 3386 * subroutine for SADB_GET and SADB_DUMP. 3387 */ 3388static struct mbuf * 3389key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3390 u_int32_t seq, u_int32_t pid) 3391{ 3392 struct mbuf *result = NULL, *tres = NULL, *m; 3393 int i; 3394 int dumporder[] = { 3395 SADB_EXT_SA, SADB_X_EXT_SA2, 3396 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3397 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3398 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3399 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3400 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3401#ifdef IPSEC_NAT_T 3402 SADB_X_EXT_NAT_T_TYPE, 3403 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3404 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3405 SADB_X_EXT_NAT_T_FRAG, 3406#endif 3407 }; 3408 3409 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3410 if (m == NULL) 3411 goto fail; 3412 result = m; 3413 3414 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3415 m = NULL; 3416 switch (dumporder[i]) { 3417 case SADB_EXT_SA: 3418 m = key_setsadbsa(sav); 3419 if (!m) 3420 goto fail; 3421 break; 3422 3423 case SADB_X_EXT_SA2: 3424 m = key_setsadbxsa2(sav->sah->saidx.mode, 3425 sav->replay ? sav->replay->count : 0, 3426 sav->sah->saidx.reqid); 3427 if (!m) 3428 goto fail; 3429 break; 3430 3431 case SADB_EXT_ADDRESS_SRC: 3432 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3433 &sav->sah->saidx.src.sa, 3434 FULLMASK, IPSEC_ULPROTO_ANY); 3435 if (!m) 3436 goto fail; 3437 break; 3438 3439 case SADB_EXT_ADDRESS_DST: 3440 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3441 &sav->sah->saidx.dst.sa, 3442 FULLMASK, IPSEC_ULPROTO_ANY); 3443 if (!m) 3444 goto fail; 3445 break; 3446 3447 case SADB_EXT_KEY_AUTH: 3448 if (!sav->key_auth) 3449 continue; 3450 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3451 if (!m) 3452 goto fail; 3453 break; 3454 3455 case SADB_EXT_KEY_ENCRYPT: 3456 if (!sav->key_enc) 3457 continue; 3458 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3459 if (!m) 3460 goto fail; 3461 break; 3462 3463 case SADB_EXT_LIFETIME_CURRENT: 3464 if (!sav->lft_c) 3465 continue; 3466 m = key_setlifetime(sav->lft_c, 3467 SADB_EXT_LIFETIME_CURRENT); 3468 if (!m) 3469 goto fail; 3470 break; 3471 3472 case SADB_EXT_LIFETIME_HARD: 3473 if (!sav->lft_h) 3474 continue; 3475 m = key_setlifetime(sav->lft_h, 3476 SADB_EXT_LIFETIME_HARD); 3477 if (!m) 3478 goto fail; 3479 break; 3480 3481 case SADB_EXT_LIFETIME_SOFT: 3482 if (!sav->lft_s) 3483 continue; 3484 m = key_setlifetime(sav->lft_s, 3485 SADB_EXT_LIFETIME_SOFT); 3486 3487 if (!m) 3488 goto fail; 3489 break; 3490 3491#ifdef IPSEC_NAT_T 3492 case SADB_X_EXT_NAT_T_TYPE: 3493 m = key_setsadbxtype(sav->natt_type); 3494 if (!m) 3495 goto fail; 3496 break; 3497 3498 case SADB_X_EXT_NAT_T_DPORT: 3499 m = key_setsadbxport( 3500 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3501 SADB_X_EXT_NAT_T_DPORT); 3502 if (!m) 3503 goto fail; 3504 break; 3505 3506 case SADB_X_EXT_NAT_T_SPORT: 3507 m = key_setsadbxport( 3508 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3509 SADB_X_EXT_NAT_T_SPORT); 3510 if (!m) 3511 goto fail; 3512 break; 3513 3514 case SADB_X_EXT_NAT_T_OAI: 3515 case SADB_X_EXT_NAT_T_OAR: 3516 case SADB_X_EXT_NAT_T_FRAG: 3517 /* We do not (yet) support those. */ 3518 continue; 3519#endif 3520 3521 case SADB_EXT_ADDRESS_PROXY: 3522 case SADB_EXT_IDENTITY_SRC: 3523 case SADB_EXT_IDENTITY_DST: 3524 /* XXX: should we brought from SPD ? */ 3525 case SADB_EXT_SENSITIVITY: 3526 default: 3527 continue; 3528 } 3529 3530 if (!m) 3531 goto fail; 3532 if (tres) 3533 m_cat(m, tres); 3534 tres = m; 3535 3536 } 3537 3538 m_cat(result, tres); 3539 if (result->m_len < sizeof(struct sadb_msg)) { 3540 result = m_pullup(result, sizeof(struct sadb_msg)); 3541 if (result == NULL) 3542 goto fail; 3543 } 3544 3545 result->m_pkthdr.len = 0; 3546 for (m = result; m; m = m->m_next) 3547 result->m_pkthdr.len += m->m_len; 3548 3549 mtod(result, struct sadb_msg *)->sadb_msg_len = 3550 PFKEY_UNIT64(result->m_pkthdr.len); 3551 3552 return result; 3553 3554fail: 3555 m_freem(result); 3556 m_freem(tres); 3557 return NULL; 3558} 3559 3560/* 3561 * set data into sadb_msg. 3562 */ 3563static struct mbuf * 3564key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3565 pid_t pid, u_int16_t reserved) 3566{ 3567 struct mbuf *m; 3568 struct sadb_msg *p; 3569 int len; 3570 3571 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3572 if (len > MCLBYTES) 3573 return NULL; 3574 MGETHDR(m, M_NOWAIT, MT_DATA); 3575 if (m && len > MHLEN) { 3576 MCLGET(m, M_NOWAIT); 3577 if ((m->m_flags & M_EXT) == 0) { 3578 m_freem(m); 3579 m = NULL; 3580 } 3581 } 3582 if (!m) 3583 return NULL; 3584 m->m_pkthdr.len = m->m_len = len; 3585 m->m_next = NULL; 3586 3587 p = mtod(m, struct sadb_msg *); 3588 3589 bzero(p, len); 3590 p->sadb_msg_version = PF_KEY_V2; 3591 p->sadb_msg_type = type; 3592 p->sadb_msg_errno = 0; 3593 p->sadb_msg_satype = satype; 3594 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3595 p->sadb_msg_reserved = reserved; 3596 p->sadb_msg_seq = seq; 3597 p->sadb_msg_pid = (u_int32_t)pid; 3598 3599 return m; 3600} 3601 3602/* 3603 * copy secasvar data into sadb_address. 3604 */ 3605static struct mbuf * 3606key_setsadbsa(sav) 3607 struct secasvar *sav; 3608{ 3609 struct mbuf *m; 3610 struct sadb_sa *p; 3611 int len; 3612 3613 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3614 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3615 if (m == NULL) 3616 return (NULL); 3617 m_align(m, len); 3618 m->m_len = len; 3619 p = mtod(m, struct sadb_sa *); 3620 bzero(p, len); 3621 p->sadb_sa_len = PFKEY_UNIT64(len); 3622 p->sadb_sa_exttype = SADB_EXT_SA; 3623 p->sadb_sa_spi = sav->spi; 3624 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3625 p->sadb_sa_state = sav->state; 3626 p->sadb_sa_auth = sav->alg_auth; 3627 p->sadb_sa_encrypt = sav->alg_enc; 3628 p->sadb_sa_flags = sav->flags; 3629 3630 return m; 3631} 3632 3633/* 3634 * set data into sadb_address. 3635 */ 3636static struct mbuf * 3637key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3638{ 3639 struct mbuf *m; 3640 struct sadb_address *p; 3641 size_t len; 3642 3643 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3644 PFKEY_ALIGN8(saddr->sa_len); 3645 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3646 if (m == NULL) 3647 return (NULL); 3648 m_align(m, len); 3649 m->m_len = len; 3650 p = mtod(m, struct sadb_address *); 3651 3652 bzero(p, len); 3653 p->sadb_address_len = PFKEY_UNIT64(len); 3654 p->sadb_address_exttype = exttype; 3655 p->sadb_address_proto = ul_proto; 3656 if (prefixlen == FULLMASK) { 3657 switch (saddr->sa_family) { 3658 case AF_INET: 3659 prefixlen = sizeof(struct in_addr) << 3; 3660 break; 3661 case AF_INET6: 3662 prefixlen = sizeof(struct in6_addr) << 3; 3663 break; 3664 default: 3665 ; /*XXX*/ 3666 } 3667 } 3668 p->sadb_address_prefixlen = prefixlen; 3669 p->sadb_address_reserved = 0; 3670 3671 bcopy(saddr, 3672 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3673 saddr->sa_len); 3674 3675 return m; 3676} 3677 3678/* 3679 * set data into sadb_x_sa2. 3680 */ 3681static struct mbuf * 3682key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3683{ 3684 struct mbuf *m; 3685 struct sadb_x_sa2 *p; 3686 size_t len; 3687 3688 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3689 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3690 if (m == NULL) 3691 return (NULL); 3692 m_align(m, len); 3693 m->m_len = len; 3694 p = mtod(m, struct sadb_x_sa2 *); 3695 3696 bzero(p, len); 3697 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3698 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3699 p->sadb_x_sa2_mode = mode; 3700 p->sadb_x_sa2_reserved1 = 0; 3701 p->sadb_x_sa2_reserved2 = 0; 3702 p->sadb_x_sa2_sequence = seq; 3703 p->sadb_x_sa2_reqid = reqid; 3704 3705 return m; 3706} 3707 3708#ifdef IPSEC_NAT_T 3709/* 3710 * Set a type in sadb_x_nat_t_type. 3711 */ 3712static struct mbuf * 3713key_setsadbxtype(u_int16_t type) 3714{ 3715 struct mbuf *m; 3716 size_t len; 3717 struct sadb_x_nat_t_type *p; 3718 3719 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3720 3721 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3722 if (m == NULL) 3723 return (NULL); 3724 m_align(m, len); 3725 m->m_len = len; 3726 p = mtod(m, struct sadb_x_nat_t_type *); 3727 3728 bzero(p, len); 3729 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3730 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3731 p->sadb_x_nat_t_type_type = type; 3732 3733 return (m); 3734} 3735/* 3736 * Set a port in sadb_x_nat_t_port. 3737 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3738 */ 3739static struct mbuf * 3740key_setsadbxport(u_int16_t port, u_int16_t type) 3741{ 3742 struct mbuf *m; 3743 size_t len; 3744 struct sadb_x_nat_t_port *p; 3745 3746 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3747 3748 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3749 if (m == NULL) 3750 return (NULL); 3751 m_align(m, len); 3752 m->m_len = len; 3753 p = mtod(m, struct sadb_x_nat_t_port *); 3754 3755 bzero(p, len); 3756 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3757 p->sadb_x_nat_t_port_exttype = type; 3758 p->sadb_x_nat_t_port_port = port; 3759 3760 return (m); 3761} 3762 3763/* 3764 * Get port from sockaddr. Port is in network byte order. 3765 */ 3766u_int16_t 3767key_portfromsaddr(struct sockaddr *sa) 3768{ 3769 3770 switch (sa->sa_family) { 3771#ifdef INET 3772 case AF_INET: 3773 return ((struct sockaddr_in *)sa)->sin_port; 3774#endif 3775#ifdef INET6 3776 case AF_INET6: 3777 return ((struct sockaddr_in6 *)sa)->sin6_port; 3778#endif 3779 } 3780 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3781 printf("DP %s unexpected address family %d\n", 3782 __func__, sa->sa_family)); 3783 return (0); 3784} 3785#endif /* IPSEC_NAT_T */ 3786 3787/* 3788 * Set port in struct sockaddr. Port is in network byte order. 3789 */ 3790static void 3791key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3792{ 3793 3794 switch (sa->sa_family) { 3795#ifdef INET 3796 case AF_INET: 3797 ((struct sockaddr_in *)sa)->sin_port = port; 3798 break; 3799#endif 3800#ifdef INET6 3801 case AF_INET6: 3802 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3803 break; 3804#endif 3805 default: 3806 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3807 __func__, sa->sa_family)); 3808 break; 3809 } 3810} 3811 3812/* 3813 * set data into sadb_x_policy 3814 */ 3815static struct mbuf * 3816key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3817{ 3818 struct mbuf *m; 3819 struct sadb_x_policy *p; 3820 size_t len; 3821 3822 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3823 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3824 if (m == NULL) 3825 return (NULL); 3826 m_align(m, len); 3827 m->m_len = len; 3828 p = mtod(m, struct sadb_x_policy *); 3829 3830 bzero(p, len); 3831 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3832 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3833 p->sadb_x_policy_type = type; 3834 p->sadb_x_policy_dir = dir; 3835 p->sadb_x_policy_id = id; 3836 3837 return m; 3838} 3839 3840/* %%% utilities */ 3841/* Take a key message (sadb_key) from the socket and turn it into one 3842 * of the kernel's key structures (seckey). 3843 * 3844 * IN: pointer to the src 3845 * OUT: NULL no more memory 3846 */ 3847struct seckey * 3848key_dup_keymsg(const struct sadb_key *src, u_int len, 3849 struct malloc_type *type) 3850{ 3851 struct seckey *dst; 3852 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3853 if (dst != NULL) { 3854 dst->bits = src->sadb_key_bits; 3855 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3856 if (dst->key_data != NULL) { 3857 bcopy((const char *)src + sizeof(struct sadb_key), 3858 dst->key_data, len); 3859 } else { 3860 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3861 __func__)); 3862 free(dst, type); 3863 dst = NULL; 3864 } 3865 } else { 3866 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3867 __func__)); 3868 3869 } 3870 return dst; 3871} 3872 3873/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3874 * turn it into one of the kernel's lifetime structures (seclifetime). 3875 * 3876 * IN: pointer to the destination, source and malloc type 3877 * OUT: NULL, no more memory 3878 */ 3879 3880static struct seclifetime * 3881key_dup_lifemsg(const struct sadb_lifetime *src, 3882 struct malloc_type *type) 3883{ 3884 struct seclifetime *dst = NULL; 3885 3886 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3887 type, M_NOWAIT); 3888 if (dst == NULL) { 3889 /* XXX counter */ 3890 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3891 } else { 3892 dst->allocations = src->sadb_lifetime_allocations; 3893 dst->bytes = src->sadb_lifetime_bytes; 3894 dst->addtime = src->sadb_lifetime_addtime; 3895 dst->usetime = src->sadb_lifetime_usetime; 3896 } 3897 return dst; 3898} 3899 3900/* compare my own address 3901 * OUT: 1: true, i.e. my address. 3902 * 0: false 3903 */ 3904int 3905key_ismyaddr(struct sockaddr *sa) 3906{ 3907 3908 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3909 switch (sa->sa_family) { 3910#ifdef INET 3911 case AF_INET: 3912 return (in_localip(satosin(sa)->sin_addr)); 3913#endif 3914#ifdef INET6 3915 case AF_INET6: 3916 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3917#endif 3918 } 3919 3920 return 0; 3921} 3922 3923#ifdef INET6 3924/* 3925 * compare my own address for IPv6. 3926 * 1: ours 3927 * 0: other 3928 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3929 */ 3930#include <netinet6/in6_var.h> 3931 3932static int 3933key_ismyaddr6(sin6) 3934 struct sockaddr_in6 *sin6; 3935{ 3936 struct in6_ifaddr *ia; 3937#if 0 3938 struct in6_multi *in6m; 3939#endif 3940 3941 IN6_IFADDR_RLOCK(); 3942 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3943 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3944 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3945 IN6_IFADDR_RUNLOCK(); 3946 return 1; 3947 } 3948 3949#if 0 3950 /* 3951 * XXX Multicast 3952 * XXX why do we care about multlicast here while we don't care 3953 * about IPv4 multicast?? 3954 * XXX scope 3955 */ 3956 in6m = NULL; 3957 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3958 if (in6m) { 3959 IN6_IFADDR_RUNLOCK(); 3960 return 1; 3961 } 3962#endif 3963 } 3964 IN6_IFADDR_RUNLOCK(); 3965 3966 /* loopback, just for safety */ 3967 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3968 return 1; 3969 3970 return 0; 3971} 3972#endif /*INET6*/ 3973 3974/* 3975 * compare two secasindex structure. 3976 * flag can specify to compare 2 saidxes. 3977 * compare two secasindex structure without both mode and reqid. 3978 * don't compare port. 3979 * IN: 3980 * saidx0: source, it can be in SAD. 3981 * saidx1: object. 3982 * OUT: 3983 * 1 : equal 3984 * 0 : not equal 3985 */ 3986static int 3987key_cmpsaidx( 3988 const struct secasindex *saidx0, 3989 const struct secasindex *saidx1, 3990 int flag) 3991{ 3992 int chkport = 0; 3993 3994 /* sanity */ 3995 if (saidx0 == NULL && saidx1 == NULL) 3996 return 1; 3997 3998 if (saidx0 == NULL || saidx1 == NULL) 3999 return 0; 4000 4001 if (saidx0->proto != saidx1->proto) 4002 return 0; 4003 4004 if (flag == CMP_EXACTLY) { 4005 if (saidx0->mode != saidx1->mode) 4006 return 0; 4007 if (saidx0->reqid != saidx1->reqid) 4008 return 0; 4009 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4010 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4011 return 0; 4012 } else { 4013 4014 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4015 if (flag == CMP_MODE_REQID 4016 ||flag == CMP_REQID) { 4017 /* 4018 * If reqid of SPD is non-zero, unique SA is required. 4019 * The result must be of same reqid in this case. 4020 */ 4021 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4022 return 0; 4023 } 4024 4025 if (flag == CMP_MODE_REQID) { 4026 if (saidx0->mode != IPSEC_MODE_ANY 4027 && saidx0->mode != saidx1->mode) 4028 return 0; 4029 } 4030 4031#ifdef IPSEC_NAT_T 4032 /* 4033 * If NAT-T is enabled, check ports for tunnel mode. 4034 * Do not check ports if they are set to zero in the SPD. 4035 * Also do not do it for native transport mode, as there 4036 * is no port information available in the SP. 4037 */ 4038 if ((saidx1->mode == IPSEC_MODE_TUNNEL || 4039 (saidx1->mode == IPSEC_MODE_TRANSPORT && 4040 saidx1->proto == IPPROTO_ESP)) && 4041 saidx1->src.sa.sa_family == AF_INET && 4042 saidx1->dst.sa.sa_family == AF_INET && 4043 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 4044 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 4045 chkport = 1; 4046#endif /* IPSEC_NAT_T */ 4047 4048 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 4049 return 0; 4050 } 4051 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 4052 return 0; 4053 } 4054 } 4055 4056 return 1; 4057} 4058 4059/* 4060 * compare two secindex structure exactly. 4061 * IN: 4062 * spidx0: source, it is often in SPD. 4063 * spidx1: object, it is often from PFKEY message. 4064 * OUT: 4065 * 1 : equal 4066 * 0 : not equal 4067 */ 4068static int 4069key_cmpspidx_exactly( 4070 struct secpolicyindex *spidx0, 4071 struct secpolicyindex *spidx1) 4072{ 4073 /* sanity */ 4074 if (spidx0 == NULL && spidx1 == NULL) 4075 return 1; 4076 4077 if (spidx0 == NULL || spidx1 == NULL) 4078 return 0; 4079 4080 if (spidx0->prefs != spidx1->prefs 4081 || spidx0->prefd != spidx1->prefd 4082 || spidx0->ul_proto != spidx1->ul_proto) 4083 return 0; 4084 4085 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4086 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4087} 4088 4089/* 4090 * compare two secindex structure with mask. 4091 * IN: 4092 * spidx0: source, it is often in SPD. 4093 * spidx1: object, it is often from IP header. 4094 * OUT: 4095 * 1 : equal 4096 * 0 : not equal 4097 */ 4098static int 4099key_cmpspidx_withmask( 4100 struct secpolicyindex *spidx0, 4101 struct secpolicyindex *spidx1) 4102{ 4103 /* sanity */ 4104 if (spidx0 == NULL && spidx1 == NULL) 4105 return 1; 4106 4107 if (spidx0 == NULL || spidx1 == NULL) 4108 return 0; 4109 4110 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4111 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4112 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4113 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4114 return 0; 4115 4116 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4117 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4118 && spidx0->ul_proto != spidx1->ul_proto) 4119 return 0; 4120 4121 switch (spidx0->src.sa.sa_family) { 4122 case AF_INET: 4123 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4124 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4125 return 0; 4126 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4127 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4128 return 0; 4129 break; 4130 case AF_INET6: 4131 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4132 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4133 return 0; 4134 /* 4135 * scope_id check. if sin6_scope_id is 0, we regard it 4136 * as a wildcard scope, which matches any scope zone ID. 4137 */ 4138 if (spidx0->src.sin6.sin6_scope_id && 4139 spidx1->src.sin6.sin6_scope_id && 4140 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4141 return 0; 4142 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4143 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4144 return 0; 4145 break; 4146 default: 4147 /* XXX */ 4148 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4149 return 0; 4150 break; 4151 } 4152 4153 switch (spidx0->dst.sa.sa_family) { 4154 case AF_INET: 4155 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4156 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4157 return 0; 4158 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4159 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4160 return 0; 4161 break; 4162 case AF_INET6: 4163 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4164 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4165 return 0; 4166 /* 4167 * scope_id check. if sin6_scope_id is 0, we regard it 4168 * as a wildcard scope, which matches any scope zone ID. 4169 */ 4170 if (spidx0->dst.sin6.sin6_scope_id && 4171 spidx1->dst.sin6.sin6_scope_id && 4172 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4173 return 0; 4174 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4175 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4176 return 0; 4177 break; 4178 default: 4179 /* XXX */ 4180 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4181 return 0; 4182 break; 4183 } 4184 4185 /* XXX Do we check other field ? e.g. flowinfo */ 4186 4187 return 1; 4188} 4189 4190/* returns 0 on match */ 4191static int 4192key_sockaddrcmp( 4193 const struct sockaddr *sa1, 4194 const struct sockaddr *sa2, 4195 int port) 4196{ 4197#ifdef satosin 4198#undef satosin 4199#endif 4200#define satosin(s) ((const struct sockaddr_in *)s) 4201#ifdef satosin6 4202#undef satosin6 4203#endif 4204#define satosin6(s) ((const struct sockaddr_in6 *)s) 4205 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4206 return 1; 4207 4208 switch (sa1->sa_family) { 4209 case AF_INET: 4210 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4211 return 1; 4212 if (satosin(sa1)->sin_addr.s_addr != 4213 satosin(sa2)->sin_addr.s_addr) { 4214 return 1; 4215 } 4216 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4217 return 1; 4218 break; 4219 case AF_INET6: 4220 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4221 return 1; /*EINVAL*/ 4222 if (satosin6(sa1)->sin6_scope_id != 4223 satosin6(sa2)->sin6_scope_id) { 4224 return 1; 4225 } 4226 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4227 &satosin6(sa2)->sin6_addr)) { 4228 return 1; 4229 } 4230 if (port && 4231 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4232 return 1; 4233 } 4234 break; 4235 default: 4236 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4237 return 1; 4238 break; 4239 } 4240 4241 return 0; 4242#undef satosin 4243#undef satosin6 4244} 4245 4246/* 4247 * compare two buffers with mask. 4248 * IN: 4249 * addr1: source 4250 * addr2: object 4251 * bits: Number of bits to compare 4252 * OUT: 4253 * 1 : equal 4254 * 0 : not equal 4255 */ 4256static int 4257key_bbcmp(const void *a1, const void *a2, u_int bits) 4258{ 4259 const unsigned char *p1 = a1; 4260 const unsigned char *p2 = a2; 4261 4262 /* XXX: This could be considerably faster if we compare a word 4263 * at a time, but it is complicated on LSB Endian machines */ 4264 4265 /* Handle null pointers */ 4266 if (p1 == NULL || p2 == NULL) 4267 return (p1 == p2); 4268 4269 while (bits >= 8) { 4270 if (*p1++ != *p2++) 4271 return 0; 4272 bits -= 8; 4273 } 4274 4275 if (bits > 0) { 4276 u_int8_t mask = ~((1<<(8-bits))-1); 4277 if ((*p1 & mask) != (*p2 & mask)) 4278 return 0; 4279 } 4280 return 1; /* Match! */ 4281} 4282 4283static void 4284key_flush_spd(time_t now) 4285{ 4286 static u_int16_t sptree_scangen = 0; 4287 u_int16_t gen = sptree_scangen++; 4288 struct secpolicy *sp; 4289 u_int dir; 4290 4291 /* SPD */ 4292 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4293restart: 4294 SPTREE_LOCK(); 4295 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4296 if (sp->scangen == gen) /* previously handled */ 4297 continue; 4298 sp->scangen = gen; 4299 if (sp->state == IPSEC_SPSTATE_DEAD && 4300 sp->refcnt == 1) { 4301 /* 4302 * Ensure that we only decrease refcnt once, 4303 * when we're the last consumer. 4304 * Directly call SP_DELREF/key_delsp instead 4305 * of KEY_FREESP to avoid unlocking/relocking 4306 * SPTREE_LOCK before key_delsp: may refcnt 4307 * be increased again during that time ? 4308 * NB: also clean entries created by 4309 * key_spdflush 4310 */ 4311 SP_DELREF(sp); 4312 key_delsp(sp); 4313 SPTREE_UNLOCK(); 4314 goto restart; 4315 } 4316 if (sp->lifetime == 0 && sp->validtime == 0) 4317 continue; 4318 if ((sp->lifetime && now - sp->created > sp->lifetime) 4319 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4320 sp->state = IPSEC_SPSTATE_DEAD; 4321 SPTREE_UNLOCK(); 4322 key_spdexpire(sp); 4323 goto restart; 4324 } 4325 } 4326 SPTREE_UNLOCK(); 4327 } 4328} 4329 4330static void 4331key_flush_sad(time_t now) 4332{ 4333 struct secashead *sah, *nextsah; 4334 struct secasvar *sav, *nextsav; 4335 4336 /* SAD */ 4337 SAHTREE_LOCK(); 4338 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4339 /* if sah has been dead, then delete it and process next sah. */ 4340 if (sah->state == SADB_SASTATE_DEAD) { 4341 key_delsah(sah); 4342 continue; 4343 } 4344 4345 /* if LARVAL entry doesn't become MATURE, delete it. */ 4346 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4347 /* Need to also check refcnt for a larval SA ??? */ 4348 if (now - sav->created > V_key_larval_lifetime) 4349 KEY_FREESAV(&sav); 4350 } 4351 4352 /* 4353 * check MATURE entry to start to send expire message 4354 * whether or not. 4355 */ 4356 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4357 /* we don't need to check. */ 4358 if (sav->lft_s == NULL) 4359 continue; 4360 4361 /* sanity check */ 4362 if (sav->lft_c == NULL) { 4363 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4364 "time, why?\n", __func__)); 4365 continue; 4366 } 4367 4368 /* check SOFT lifetime */ 4369 if (sav->lft_s->addtime != 0 && 4370 now - sav->created > sav->lft_s->addtime) { 4371 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4372 /* 4373 * Actually, only send expire message if 4374 * SA has been used, as it was done before, 4375 * but should we always send such message, 4376 * and let IKE daemon decide if it should be 4377 * renegotiated or not ? 4378 * XXX expire message will actually NOT be 4379 * sent if SA is only used after soft 4380 * lifetime has been reached, see below 4381 * (DYING state) 4382 */ 4383 if (sav->lft_c->usetime != 0) 4384 key_expire(sav); 4385 } 4386 /* check SOFT lifetime by bytes */ 4387 /* 4388 * XXX I don't know the way to delete this SA 4389 * when new SA is installed. Caution when it's 4390 * installed too big lifetime by time. 4391 */ 4392 else if (sav->lft_s->bytes != 0 && 4393 sav->lft_s->bytes < sav->lft_c->bytes) { 4394 4395 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4396 /* 4397 * XXX If we keep to send expire 4398 * message in the status of 4399 * DYING. Do remove below code. 4400 */ 4401 key_expire(sav); 4402 } 4403 } 4404 4405 /* check DYING entry to change status to DEAD. */ 4406 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4407 /* we don't need to check. */ 4408 if (sav->lft_h == NULL) 4409 continue; 4410 4411 /* sanity check */ 4412 if (sav->lft_c == NULL) { 4413 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4414 "time, why?\n", __func__)); 4415 continue; 4416 } 4417 4418 if (sav->lft_h->addtime != 0 && 4419 now - sav->created > sav->lft_h->addtime) { 4420 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4421 KEY_FREESAV(&sav); 4422 } 4423#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4424 else if (sav->lft_s != NULL 4425 && sav->lft_s->addtime != 0 4426 && now - sav->created > sav->lft_s->addtime) { 4427 /* 4428 * XXX: should be checked to be 4429 * installed the valid SA. 4430 */ 4431 4432 /* 4433 * If there is no SA then sending 4434 * expire message. 4435 */ 4436 key_expire(sav); 4437 } 4438#endif 4439 /* check HARD lifetime by bytes */ 4440 else if (sav->lft_h->bytes != 0 && 4441 sav->lft_h->bytes < sav->lft_c->bytes) { 4442 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4443 KEY_FREESAV(&sav); 4444 } 4445 } 4446 4447 /* delete entry in DEAD */ 4448 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4449 /* sanity check */ 4450 if (sav->state != SADB_SASTATE_DEAD) { 4451 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4452 "(queue: %d SA: %d): kill it anyway\n", 4453 __func__, 4454 SADB_SASTATE_DEAD, sav->state)); 4455 } 4456 /* 4457 * do not call key_freesav() here. 4458 * sav should already be freed, and sav->refcnt 4459 * shows other references to sav 4460 * (such as from SPD). 4461 */ 4462 } 4463 } 4464 SAHTREE_UNLOCK(); 4465} 4466 4467static void 4468key_flush_acq(time_t now) 4469{ 4470 struct secacq *acq, *nextacq; 4471 4472 /* ACQ tree */ 4473 ACQ_LOCK(); 4474 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4475 nextacq = LIST_NEXT(acq, chain); 4476 if (now - acq->created > V_key_blockacq_lifetime 4477 && __LIST_CHAINED(acq)) { 4478 LIST_REMOVE(acq, chain); 4479 free(acq, M_IPSEC_SAQ); 4480 } 4481 } 4482 ACQ_UNLOCK(); 4483} 4484 4485static void 4486key_flush_spacq(time_t now) 4487{ 4488 struct secspacq *acq, *nextacq; 4489 4490 /* SP ACQ tree */ 4491 SPACQ_LOCK(); 4492 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4493 nextacq = LIST_NEXT(acq, chain); 4494 if (now - acq->created > V_key_blockacq_lifetime 4495 && __LIST_CHAINED(acq)) { 4496 LIST_REMOVE(acq, chain); 4497 free(acq, M_IPSEC_SAQ); 4498 } 4499 } 4500 SPACQ_UNLOCK(); 4501} 4502 4503/* 4504 * time handler. 4505 * scanning SPD and SAD to check status for each entries, 4506 * and do to remove or to expire. 4507 * XXX: year 2038 problem may remain. 4508 */ 4509void 4510key_timehandler(void) 4511{ 4512 VNET_ITERATOR_DECL(vnet_iter); 4513 time_t now = time_second; 4514 4515 VNET_LIST_RLOCK_NOSLEEP(); 4516 VNET_FOREACH(vnet_iter) { 4517 CURVNET_SET(vnet_iter); 4518 key_flush_spd(now); 4519 key_flush_sad(now); 4520 key_flush_acq(now); 4521 key_flush_spacq(now); 4522 CURVNET_RESTORE(); 4523 } 4524 VNET_LIST_RUNLOCK_NOSLEEP(); 4525 4526#ifndef IPSEC_DEBUG2 4527 /* do exchange to tick time !! */ 4528 (void)timeout((void *)key_timehandler, (void *)0, hz); 4529#endif /* IPSEC_DEBUG2 */ 4530} 4531 4532u_long 4533key_random() 4534{ 4535 u_long value; 4536 4537 key_randomfill(&value, sizeof(value)); 4538 return value; 4539} 4540 4541void 4542key_randomfill(p, l) 4543 void *p; 4544 size_t l; 4545{ 4546 size_t n; 4547 u_long v; 4548 static int warn = 1; 4549 4550 n = 0; 4551 n = (size_t)read_random(p, (u_int)l); 4552 /* last resort */ 4553 while (n < l) { 4554 v = random(); 4555 bcopy(&v, (u_int8_t *)p + n, 4556 l - n < sizeof(v) ? l - n : sizeof(v)); 4557 n += sizeof(v); 4558 4559 if (warn) { 4560 printf("WARNING: pseudo-random number generator " 4561 "used for IPsec processing\n"); 4562 warn = 0; 4563 } 4564 } 4565} 4566 4567/* 4568 * map SADB_SATYPE_* to IPPROTO_*. 4569 * if satype == SADB_SATYPE then satype is mapped to ~0. 4570 * OUT: 4571 * 0: invalid satype. 4572 */ 4573static u_int16_t 4574key_satype2proto(u_int8_t satype) 4575{ 4576 switch (satype) { 4577 case SADB_SATYPE_UNSPEC: 4578 return IPSEC_PROTO_ANY; 4579 case SADB_SATYPE_AH: 4580 return IPPROTO_AH; 4581 case SADB_SATYPE_ESP: 4582 return IPPROTO_ESP; 4583 case SADB_X_SATYPE_IPCOMP: 4584 return IPPROTO_IPCOMP; 4585 case SADB_X_SATYPE_TCPSIGNATURE: 4586 return IPPROTO_TCP; 4587 default: 4588 return 0; 4589 } 4590 /* NOTREACHED */ 4591} 4592 4593/* 4594 * map IPPROTO_* to SADB_SATYPE_* 4595 * OUT: 4596 * 0: invalid protocol type. 4597 */ 4598static u_int8_t 4599key_proto2satype(u_int16_t proto) 4600{ 4601 switch (proto) { 4602 case IPPROTO_AH: 4603 return SADB_SATYPE_AH; 4604 case IPPROTO_ESP: 4605 return SADB_SATYPE_ESP; 4606 case IPPROTO_IPCOMP: 4607 return SADB_X_SATYPE_IPCOMP; 4608 case IPPROTO_TCP: 4609 return SADB_X_SATYPE_TCPSIGNATURE; 4610 default: 4611 return 0; 4612 } 4613 /* NOTREACHED */ 4614} 4615 4616/* %%% PF_KEY */ 4617/* 4618 * SADB_GETSPI processing is to receive 4619 * <base, (SA2), src address, dst address, (SPI range)> 4620 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4621 * tree with the status of LARVAL, and send 4622 * <base, SA(*), address(SD)> 4623 * to the IKMPd. 4624 * 4625 * IN: mhp: pointer to the pointer to each header. 4626 * OUT: NULL if fail. 4627 * other if success, return pointer to the message to send. 4628 */ 4629static int 4630key_getspi(so, m, mhp) 4631 struct socket *so; 4632 struct mbuf *m; 4633 const struct sadb_msghdr *mhp; 4634{ 4635 struct sadb_address *src0, *dst0; 4636 struct secasindex saidx; 4637 struct secashead *newsah; 4638 struct secasvar *newsav; 4639 u_int8_t proto; 4640 u_int32_t spi; 4641 u_int8_t mode; 4642 u_int32_t reqid; 4643 int error; 4644 4645 IPSEC_ASSERT(so != NULL, ("null socket")); 4646 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4647 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4648 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4649 4650 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4651 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4652 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4653 __func__)); 4654 return key_senderror(so, m, EINVAL); 4655 } 4656 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4657 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4658 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4659 __func__)); 4660 return key_senderror(so, m, EINVAL); 4661 } 4662 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4663 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4664 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4665 } else { 4666 mode = IPSEC_MODE_ANY; 4667 reqid = 0; 4668 } 4669 4670 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4671 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4672 4673 /* map satype to proto */ 4674 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4675 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4676 __func__)); 4677 return key_senderror(so, m, EINVAL); 4678 } 4679 4680 /* 4681 * Make sure the port numbers are zero. 4682 * In case of NAT-T we will update them later if needed. 4683 */ 4684 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4685 case AF_INET: 4686 if (((struct sockaddr *)(src0 + 1))->sa_len != 4687 sizeof(struct sockaddr_in)) 4688 return key_senderror(so, m, EINVAL); 4689 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4690 break; 4691 case AF_INET6: 4692 if (((struct sockaddr *)(src0 + 1))->sa_len != 4693 sizeof(struct sockaddr_in6)) 4694 return key_senderror(so, m, EINVAL); 4695 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4696 break; 4697 default: 4698 ; /*???*/ 4699 } 4700 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4701 case AF_INET: 4702 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4703 sizeof(struct sockaddr_in)) 4704 return key_senderror(so, m, EINVAL); 4705 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4706 break; 4707 case AF_INET6: 4708 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4709 sizeof(struct sockaddr_in6)) 4710 return key_senderror(so, m, EINVAL); 4711 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4712 break; 4713 default: 4714 ; /*???*/ 4715 } 4716 4717 /* XXX boundary check against sa_len */ 4718 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4719 4720#ifdef IPSEC_NAT_T 4721 /* 4722 * Handle NAT-T info if present. 4723 * We made sure the port numbers are zero above, so we do 4724 * not have to worry in case we do not update them. 4725 */ 4726 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4727 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4728 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4729 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4730 4731 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4732 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4733 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4734 struct sadb_x_nat_t_type *type; 4735 struct sadb_x_nat_t_port *sport, *dport; 4736 4737 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4738 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4739 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4740 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4741 "passed.\n", __func__)); 4742 return key_senderror(so, m, EINVAL); 4743 } 4744 4745 sport = (struct sadb_x_nat_t_port *) 4746 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4747 dport = (struct sadb_x_nat_t_port *) 4748 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4749 4750 if (sport) 4751 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4752 if (dport) 4753 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4754 } 4755#endif 4756 4757 /* SPI allocation */ 4758 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4759 &saidx); 4760 if (spi == 0) 4761 return key_senderror(so, m, EINVAL); 4762 4763 /* get a SA index */ 4764 if ((newsah = key_getsah(&saidx)) == NULL) { 4765 /* create a new SA index */ 4766 if ((newsah = key_newsah(&saidx)) == NULL) { 4767 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4768 return key_senderror(so, m, ENOBUFS); 4769 } 4770 } 4771 4772 /* get a new SA */ 4773 /* XXX rewrite */ 4774 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4775 if (newsav == NULL) { 4776 /* XXX don't free new SA index allocated in above. */ 4777 return key_senderror(so, m, error); 4778 } 4779 4780 /* set spi */ 4781 newsav->spi = htonl(spi); 4782 4783 /* delete the entry in acqtree */ 4784 if (mhp->msg->sadb_msg_seq != 0) { 4785 struct secacq *acq; 4786 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4787 /* reset counter in order to deletion by timehandler. */ 4788 acq->created = time_second; 4789 acq->count = 0; 4790 } 4791 } 4792 4793 { 4794 struct mbuf *n, *nn; 4795 struct sadb_sa *m_sa; 4796 struct sadb_msg *newmsg; 4797 int off, len; 4798 4799 /* create new sadb_msg to reply. */ 4800 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4801 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4802 4803 MGETHDR(n, M_NOWAIT, MT_DATA); 4804 if (len > MHLEN) { 4805 MCLGET(n, M_NOWAIT); 4806 if ((n->m_flags & M_EXT) == 0) { 4807 m_freem(n); 4808 n = NULL; 4809 } 4810 } 4811 if (!n) 4812 return key_senderror(so, m, ENOBUFS); 4813 4814 n->m_len = len; 4815 n->m_next = NULL; 4816 off = 0; 4817 4818 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4819 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4820 4821 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4822 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4823 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4824 m_sa->sadb_sa_spi = htonl(spi); 4825 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4826 4827 IPSEC_ASSERT(off == len, 4828 ("length inconsistency (off %u len %u)", off, len)); 4829 4830 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4831 SADB_EXT_ADDRESS_DST); 4832 if (!n->m_next) { 4833 m_freem(n); 4834 return key_senderror(so, m, ENOBUFS); 4835 } 4836 4837 if (n->m_len < sizeof(struct sadb_msg)) { 4838 n = m_pullup(n, sizeof(struct sadb_msg)); 4839 if (n == NULL) 4840 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4841 } 4842 4843 n->m_pkthdr.len = 0; 4844 for (nn = n; nn; nn = nn->m_next) 4845 n->m_pkthdr.len += nn->m_len; 4846 4847 newmsg = mtod(n, struct sadb_msg *); 4848 newmsg->sadb_msg_seq = newsav->seq; 4849 newmsg->sadb_msg_errno = 0; 4850 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4851 4852 m_freem(m); 4853 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4854 } 4855} 4856 4857/* 4858 * allocating new SPI 4859 * called by key_getspi(). 4860 * OUT: 4861 * 0: failure. 4862 * others: success. 4863 */ 4864static u_int32_t 4865key_do_getnewspi(spirange, saidx) 4866 struct sadb_spirange *spirange; 4867 struct secasindex *saidx; 4868{ 4869 u_int32_t newspi; 4870 u_int32_t min, max; 4871 int count = V_key_spi_trycnt; 4872 4873 /* set spi range to allocate */ 4874 if (spirange != NULL) { 4875 min = spirange->sadb_spirange_min; 4876 max = spirange->sadb_spirange_max; 4877 } else { 4878 min = V_key_spi_minval; 4879 max = V_key_spi_maxval; 4880 } 4881 /* IPCOMP needs 2-byte SPI */ 4882 if (saidx->proto == IPPROTO_IPCOMP) { 4883 u_int32_t t; 4884 if (min >= 0x10000) 4885 min = 0xffff; 4886 if (max >= 0x10000) 4887 max = 0xffff; 4888 if (min > max) { 4889 t = min; min = max; max = t; 4890 } 4891 } 4892 4893 if (min == max) { 4894 if (key_checkspidup(saidx, min) != NULL) { 4895 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4896 __func__, min)); 4897 return 0; 4898 } 4899 4900 count--; /* taking one cost. */ 4901 newspi = min; 4902 4903 } else { 4904 4905 /* init SPI */ 4906 newspi = 0; 4907 4908 /* when requesting to allocate spi ranged */ 4909 while (count--) { 4910 /* generate pseudo-random SPI value ranged. */ 4911 newspi = min + (key_random() % (max - min + 1)); 4912 4913 if (key_checkspidup(saidx, newspi) == NULL) 4914 break; 4915 } 4916 4917 if (count == 0 || newspi == 0) { 4918 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4919 __func__)); 4920 return 0; 4921 } 4922 } 4923 4924 /* statistics */ 4925 keystat.getspi_count = 4926 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4927 4928 return newspi; 4929} 4930 4931/* 4932 * SADB_UPDATE processing 4933 * receive 4934 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4935 * key(AE), (identity(SD),) (sensitivity)> 4936 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4937 * and send 4938 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4939 * (identity(SD),) (sensitivity)> 4940 * to the ikmpd. 4941 * 4942 * m will always be freed. 4943 */ 4944static int 4945key_update(so, m, mhp) 4946 struct socket *so; 4947 struct mbuf *m; 4948 const struct sadb_msghdr *mhp; 4949{ 4950 struct sadb_sa *sa0; 4951 struct sadb_address *src0, *dst0; 4952#ifdef IPSEC_NAT_T 4953 struct sadb_x_nat_t_type *type; 4954 struct sadb_x_nat_t_port *sport, *dport; 4955 struct sadb_address *iaddr, *raddr; 4956 struct sadb_x_nat_t_frag *frag; 4957#endif 4958 struct secasindex saidx; 4959 struct secashead *sah; 4960 struct secasvar *sav; 4961 u_int16_t proto; 4962 u_int8_t mode; 4963 u_int32_t reqid; 4964 int error; 4965 4966 IPSEC_ASSERT(so != NULL, ("null socket")); 4967 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4968 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4969 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4970 4971 /* map satype to proto */ 4972 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4973 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4974 __func__)); 4975 return key_senderror(so, m, EINVAL); 4976 } 4977 4978 if (mhp->ext[SADB_EXT_SA] == NULL || 4979 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4980 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4981 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4982 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4983 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4984 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4985 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4986 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4987 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4988 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4989 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4990 __func__)); 4991 return key_senderror(so, m, EINVAL); 4992 } 4993 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4994 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4995 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4996 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4997 __func__)); 4998 return key_senderror(so, m, EINVAL); 4999 } 5000 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5001 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5002 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5003 } else { 5004 mode = IPSEC_MODE_ANY; 5005 reqid = 0; 5006 } 5007 /* XXX boundary checking for other extensions */ 5008 5009 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5010 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5011 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5012 5013 /* XXX boundary check against sa_len */ 5014 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5015 5016 /* 5017 * Make sure the port numbers are zero. 5018 * In case of NAT-T we will update them later if needed. 5019 */ 5020 KEY_PORTTOSADDR(&saidx.src, 0); 5021 KEY_PORTTOSADDR(&saidx.dst, 0); 5022 5023#ifdef IPSEC_NAT_T 5024 /* 5025 * Handle NAT-T info if present. 5026 */ 5027 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5028 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5029 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5030 5031 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5032 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5033 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5034 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5035 __func__)); 5036 return key_senderror(so, m, EINVAL); 5037 } 5038 5039 type = (struct sadb_x_nat_t_type *) 5040 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5041 sport = (struct sadb_x_nat_t_port *) 5042 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5043 dport = (struct sadb_x_nat_t_port *) 5044 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5045 } else { 5046 type = 0; 5047 sport = dport = 0; 5048 } 5049 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5050 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5051 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5052 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5053 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5054 __func__)); 5055 return key_senderror(so, m, EINVAL); 5056 } 5057 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5058 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5059 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5060 } else { 5061 iaddr = raddr = NULL; 5062 } 5063 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5064 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5065 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5066 __func__)); 5067 return key_senderror(so, m, EINVAL); 5068 } 5069 frag = (struct sadb_x_nat_t_frag *) 5070 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5071 } else { 5072 frag = 0; 5073 } 5074#endif 5075 5076 /* get a SA header */ 5077 if ((sah = key_getsah(&saidx)) == NULL) { 5078 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5079 return key_senderror(so, m, ENOENT); 5080 } 5081 5082 /* set spidx if there */ 5083 /* XXX rewrite */ 5084 error = key_setident(sah, m, mhp); 5085 if (error) 5086 return key_senderror(so, m, error); 5087 5088 /* find a SA with sequence number. */ 5089#ifdef IPSEC_DOSEQCHECK 5090 if (mhp->msg->sadb_msg_seq != 0 5091 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5092 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5093 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5094 return key_senderror(so, m, ENOENT); 5095 } 5096#else 5097 SAHTREE_LOCK(); 5098 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5099 SAHTREE_UNLOCK(); 5100 if (sav == NULL) { 5101 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5102 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5103 return key_senderror(so, m, EINVAL); 5104 } 5105#endif 5106 5107 /* validity check */ 5108 if (sav->sah->saidx.proto != proto) { 5109 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5110 "(DB=%u param=%u)\n", __func__, 5111 sav->sah->saidx.proto, proto)); 5112 return key_senderror(so, m, EINVAL); 5113 } 5114#ifdef IPSEC_DOSEQCHECK 5115 if (sav->spi != sa0->sadb_sa_spi) { 5116 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5117 __func__, 5118 (u_int32_t)ntohl(sav->spi), 5119 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5120 return key_senderror(so, m, EINVAL); 5121 } 5122#endif 5123 if (sav->pid != mhp->msg->sadb_msg_pid) { 5124 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5125 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5126 return key_senderror(so, m, EINVAL); 5127 } 5128 5129 /* copy sav values */ 5130 error = key_setsaval(sav, m, mhp); 5131 if (error) { 5132 KEY_FREESAV(&sav); 5133 return key_senderror(so, m, error); 5134 } 5135 5136#ifdef IPSEC_NAT_T 5137 /* 5138 * Handle more NAT-T info if present, 5139 * now that we have a sav to fill. 5140 */ 5141 if (type) 5142 sav->natt_type = type->sadb_x_nat_t_type_type; 5143 5144 if (sport) 5145 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5146 sport->sadb_x_nat_t_port_port); 5147 if (dport) 5148 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5149 dport->sadb_x_nat_t_port_port); 5150 5151#if 0 5152 /* 5153 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5154 * We should actually check for a minimum MTU here, if we 5155 * want to support it in ip_output. 5156 */ 5157 if (frag) 5158 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5159#endif 5160#endif 5161 5162 /* check SA values to be mature. */ 5163 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5164 KEY_FREESAV(&sav); 5165 return key_senderror(so, m, 0); 5166 } 5167 5168 { 5169 struct mbuf *n; 5170 5171 /* set msg buf from mhp */ 5172 n = key_getmsgbuf_x1(m, mhp); 5173 if (n == NULL) { 5174 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5175 return key_senderror(so, m, ENOBUFS); 5176 } 5177 5178 m_freem(m); 5179 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5180 } 5181} 5182 5183/* 5184 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5185 * only called by key_update(). 5186 * OUT: 5187 * NULL : not found 5188 * others : found, pointer to a SA. 5189 */ 5190#ifdef IPSEC_DOSEQCHECK 5191static struct secasvar * 5192key_getsavbyseq(sah, seq) 5193 struct secashead *sah; 5194 u_int32_t seq; 5195{ 5196 struct secasvar *sav; 5197 u_int state; 5198 5199 state = SADB_SASTATE_LARVAL; 5200 5201 /* search SAD with sequence number ? */ 5202 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5203 5204 KEY_CHKSASTATE(state, sav->state, __func__); 5205 5206 if (sav->seq == seq) { 5207 sa_addref(sav); 5208 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5209 printf("DP %s cause refcnt++:%d SA:%p\n", 5210 __func__, sav->refcnt, sav)); 5211 return sav; 5212 } 5213 } 5214 5215 return NULL; 5216} 5217#endif 5218 5219/* 5220 * SADB_ADD processing 5221 * add an entry to SA database, when received 5222 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5223 * key(AE), (identity(SD),) (sensitivity)> 5224 * from the ikmpd, 5225 * and send 5226 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5227 * (identity(SD),) (sensitivity)> 5228 * to the ikmpd. 5229 * 5230 * IGNORE identity and sensitivity messages. 5231 * 5232 * m will always be freed. 5233 */ 5234static int 5235key_add(so, m, mhp) 5236 struct socket *so; 5237 struct mbuf *m; 5238 const struct sadb_msghdr *mhp; 5239{ 5240 struct sadb_sa *sa0; 5241 struct sadb_address *src0, *dst0; 5242#ifdef IPSEC_NAT_T 5243 struct sadb_x_nat_t_type *type; 5244 struct sadb_address *iaddr, *raddr; 5245 struct sadb_x_nat_t_frag *frag; 5246#endif 5247 struct secasindex saidx; 5248 struct secashead *newsah; 5249 struct secasvar *newsav; 5250 u_int16_t proto; 5251 u_int8_t mode; 5252 u_int32_t reqid; 5253 int error; 5254 5255 IPSEC_ASSERT(so != NULL, ("null socket")); 5256 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5257 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5258 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5259 5260 /* map satype to proto */ 5261 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5262 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5263 __func__)); 5264 return key_senderror(so, m, EINVAL); 5265 } 5266 5267 if (mhp->ext[SADB_EXT_SA] == NULL || 5268 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5269 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5270 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5271 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5272 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5273 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5274 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5275 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5276 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5277 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5278 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5279 __func__)); 5280 return key_senderror(so, m, EINVAL); 5281 } 5282 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5283 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5284 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5285 /* XXX need more */ 5286 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5287 __func__)); 5288 return key_senderror(so, m, EINVAL); 5289 } 5290 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5291 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5292 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5293 } else { 5294 mode = IPSEC_MODE_ANY; 5295 reqid = 0; 5296 } 5297 5298 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5299 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5300 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5301 5302 /* XXX boundary check against sa_len */ 5303 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5304 5305 /* 5306 * Make sure the port numbers are zero. 5307 * In case of NAT-T we will update them later if needed. 5308 */ 5309 KEY_PORTTOSADDR(&saidx.src, 0); 5310 KEY_PORTTOSADDR(&saidx.dst, 0); 5311 5312#ifdef IPSEC_NAT_T 5313 /* 5314 * Handle NAT-T info if present. 5315 */ 5316 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5317 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5318 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5319 struct sadb_x_nat_t_port *sport, *dport; 5320 5321 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5322 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5323 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5324 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5325 __func__)); 5326 return key_senderror(so, m, EINVAL); 5327 } 5328 5329 type = (struct sadb_x_nat_t_type *) 5330 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5331 sport = (struct sadb_x_nat_t_port *) 5332 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5333 dport = (struct sadb_x_nat_t_port *) 5334 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5335 5336 if (sport) 5337 KEY_PORTTOSADDR(&saidx.src, 5338 sport->sadb_x_nat_t_port_port); 5339 if (dport) 5340 KEY_PORTTOSADDR(&saidx.dst, 5341 dport->sadb_x_nat_t_port_port); 5342 } else { 5343 type = 0; 5344 } 5345 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5346 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5347 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5348 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5349 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5350 __func__)); 5351 return key_senderror(so, m, EINVAL); 5352 } 5353 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5354 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5355 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5356 } else { 5357 iaddr = raddr = NULL; 5358 } 5359 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5360 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5361 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5362 __func__)); 5363 return key_senderror(so, m, EINVAL); 5364 } 5365 frag = (struct sadb_x_nat_t_frag *) 5366 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5367 } else { 5368 frag = 0; 5369 } 5370#endif 5371 5372 /* get a SA header */ 5373 if ((newsah = key_getsah(&saidx)) == NULL) { 5374 /* create a new SA header */ 5375 if ((newsah = key_newsah(&saidx)) == NULL) { 5376 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5377 return key_senderror(so, m, ENOBUFS); 5378 } 5379 } 5380 5381 /* set spidx if there */ 5382 /* XXX rewrite */ 5383 error = key_setident(newsah, m, mhp); 5384 if (error) { 5385 return key_senderror(so, m, error); 5386 } 5387 5388 /* create new SA entry. */ 5389 /* We can create new SA only if SPI is differenct. */ 5390 SAHTREE_LOCK(); 5391 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5392 SAHTREE_UNLOCK(); 5393 if (newsav != NULL) { 5394 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5395 return key_senderror(so, m, EEXIST); 5396 } 5397 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5398 if (newsav == NULL) { 5399 return key_senderror(so, m, error); 5400 } 5401 5402#ifdef IPSEC_NAT_T 5403 /* 5404 * Handle more NAT-T info if present, 5405 * now that we have a sav to fill. 5406 */ 5407 if (type) 5408 newsav->natt_type = type->sadb_x_nat_t_type_type; 5409 5410#if 0 5411 /* 5412 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5413 * We should actually check for a minimum MTU here, if we 5414 * want to support it in ip_output. 5415 */ 5416 if (frag) 5417 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5418#endif 5419#endif 5420 5421 /* check SA values to be mature. */ 5422 if ((error = key_mature(newsav)) != 0) { 5423 KEY_FREESAV(&newsav); 5424 return key_senderror(so, m, error); 5425 } 5426 5427 /* 5428 * don't call key_freesav() here, as we would like to keep the SA 5429 * in the database on success. 5430 */ 5431 5432 { 5433 struct mbuf *n; 5434 5435 /* set msg buf from mhp */ 5436 n = key_getmsgbuf_x1(m, mhp); 5437 if (n == NULL) { 5438 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5439 return key_senderror(so, m, ENOBUFS); 5440 } 5441 5442 m_freem(m); 5443 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5444 } 5445} 5446 5447/* m is retained */ 5448static int 5449key_setident(sah, m, mhp) 5450 struct secashead *sah; 5451 struct mbuf *m; 5452 const struct sadb_msghdr *mhp; 5453{ 5454 const struct sadb_ident *idsrc, *iddst; 5455 int idsrclen, iddstlen; 5456 5457 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5458 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5459 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5460 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5461 5462 /* don't make buffer if not there */ 5463 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5464 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5465 sah->idents = NULL; 5466 sah->identd = NULL; 5467 return 0; 5468 } 5469 5470 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5471 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5472 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5473 return EINVAL; 5474 } 5475 5476 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5477 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5478 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5479 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5480 5481 /* validity check */ 5482 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5483 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5484 return EINVAL; 5485 } 5486 5487 switch (idsrc->sadb_ident_type) { 5488 case SADB_IDENTTYPE_PREFIX: 5489 case SADB_IDENTTYPE_FQDN: 5490 case SADB_IDENTTYPE_USERFQDN: 5491 default: 5492 /* XXX do nothing */ 5493 sah->idents = NULL; 5494 sah->identd = NULL; 5495 return 0; 5496 } 5497 5498 /* make structure */ 5499 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5500 if (sah->idents == NULL) { 5501 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5502 return ENOBUFS; 5503 } 5504 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5505 if (sah->identd == NULL) { 5506 free(sah->idents, M_IPSEC_MISC); 5507 sah->idents = NULL; 5508 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5509 return ENOBUFS; 5510 } 5511 sah->idents->type = idsrc->sadb_ident_type; 5512 sah->idents->id = idsrc->sadb_ident_id; 5513 5514 sah->identd->type = iddst->sadb_ident_type; 5515 sah->identd->id = iddst->sadb_ident_id; 5516 5517 return 0; 5518} 5519 5520/* 5521 * m will not be freed on return. 5522 * it is caller's responsibility to free the result. 5523 */ 5524static struct mbuf * 5525key_getmsgbuf_x1(m, mhp) 5526 struct mbuf *m; 5527 const struct sadb_msghdr *mhp; 5528{ 5529 struct mbuf *n; 5530 5531 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5532 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5533 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5534 5535 /* create new sadb_msg to reply. */ 5536 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5537 SADB_EXT_SA, SADB_X_EXT_SA2, 5538 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5539 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5540 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5541 if (!n) 5542 return NULL; 5543 5544 if (n->m_len < sizeof(struct sadb_msg)) { 5545 n = m_pullup(n, sizeof(struct sadb_msg)); 5546 if (n == NULL) 5547 return NULL; 5548 } 5549 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5550 mtod(n, struct sadb_msg *)->sadb_msg_len = 5551 PFKEY_UNIT64(n->m_pkthdr.len); 5552 5553 return n; 5554} 5555 5556static int key_delete_all __P((struct socket *, struct mbuf *, 5557 const struct sadb_msghdr *, u_int16_t)); 5558 5559/* 5560 * SADB_DELETE processing 5561 * receive 5562 * <base, SA(*), address(SD)> 5563 * from the ikmpd, and set SADB_SASTATE_DEAD, 5564 * and send, 5565 * <base, SA(*), address(SD)> 5566 * to the ikmpd. 5567 * 5568 * m will always be freed. 5569 */ 5570static int 5571key_delete(so, m, mhp) 5572 struct socket *so; 5573 struct mbuf *m; 5574 const struct sadb_msghdr *mhp; 5575{ 5576 struct sadb_sa *sa0; 5577 struct sadb_address *src0, *dst0; 5578 struct secasindex saidx; 5579 struct secashead *sah; 5580 struct secasvar *sav = NULL; 5581 u_int16_t proto; 5582 5583 IPSEC_ASSERT(so != NULL, ("null socket")); 5584 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5585 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5586 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5587 5588 /* map satype to proto */ 5589 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5590 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5591 __func__)); 5592 return key_senderror(so, m, EINVAL); 5593 } 5594 5595 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5596 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5597 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5598 __func__)); 5599 return key_senderror(so, m, EINVAL); 5600 } 5601 5602 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5603 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5604 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5605 __func__)); 5606 return key_senderror(so, m, EINVAL); 5607 } 5608 5609 if (mhp->ext[SADB_EXT_SA] == NULL) { 5610 /* 5611 * Caller wants us to delete all non-LARVAL SAs 5612 * that match the src/dst. This is used during 5613 * IKE INITIAL-CONTACT. 5614 */ 5615 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5616 return key_delete_all(so, m, mhp, proto); 5617 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5618 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5619 __func__)); 5620 return key_senderror(so, m, EINVAL); 5621 } 5622 5623 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5624 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5625 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5626 5627 /* XXX boundary check against sa_len */ 5628 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5629 5630 /* 5631 * Make sure the port numbers are zero. 5632 * In case of NAT-T we will update them later if needed. 5633 */ 5634 KEY_PORTTOSADDR(&saidx.src, 0); 5635 KEY_PORTTOSADDR(&saidx.dst, 0); 5636 5637#ifdef IPSEC_NAT_T 5638 /* 5639 * Handle NAT-T info if present. 5640 */ 5641 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5642 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5643 struct sadb_x_nat_t_port *sport, *dport; 5644 5645 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5646 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5647 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5648 __func__)); 5649 return key_senderror(so, m, EINVAL); 5650 } 5651 5652 sport = (struct sadb_x_nat_t_port *) 5653 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5654 dport = (struct sadb_x_nat_t_port *) 5655 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5656 5657 if (sport) 5658 KEY_PORTTOSADDR(&saidx.src, 5659 sport->sadb_x_nat_t_port_port); 5660 if (dport) 5661 KEY_PORTTOSADDR(&saidx.dst, 5662 dport->sadb_x_nat_t_port_port); 5663 } 5664#endif 5665 5666 /* get a SA header */ 5667 SAHTREE_LOCK(); 5668 LIST_FOREACH(sah, &V_sahtree, chain) { 5669 if (sah->state == SADB_SASTATE_DEAD) 5670 continue; 5671 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5672 continue; 5673 5674 /* get a SA with SPI. */ 5675 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5676 if (sav) 5677 break; 5678 } 5679 if (sah == NULL) { 5680 SAHTREE_UNLOCK(); 5681 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5682 return key_senderror(so, m, ENOENT); 5683 } 5684 5685 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5686 KEY_FREESAV(&sav); 5687 SAHTREE_UNLOCK(); 5688 5689 { 5690 struct mbuf *n; 5691 struct sadb_msg *newmsg; 5692 5693 /* create new sadb_msg to reply. */ 5694 /* XXX-BZ NAT-T extensions? */ 5695 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5696 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5697 if (!n) 5698 return key_senderror(so, m, ENOBUFS); 5699 5700 if (n->m_len < sizeof(struct sadb_msg)) { 5701 n = m_pullup(n, sizeof(struct sadb_msg)); 5702 if (n == NULL) 5703 return key_senderror(so, m, ENOBUFS); 5704 } 5705 newmsg = mtod(n, struct sadb_msg *); 5706 newmsg->sadb_msg_errno = 0; 5707 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5708 5709 m_freem(m); 5710 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5711 } 5712} 5713 5714/* 5715 * delete all SAs for src/dst. Called from key_delete(). 5716 */ 5717static int 5718key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5719 u_int16_t proto) 5720{ 5721 struct sadb_address *src0, *dst0; 5722 struct secasindex saidx; 5723 struct secashead *sah; 5724 struct secasvar *sav, *nextsav; 5725 u_int stateidx, state; 5726 5727 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5728 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5729 5730 /* XXX boundary check against sa_len */ 5731 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5732 5733 /* 5734 * Make sure the port numbers are zero. 5735 * In case of NAT-T we will update them later if needed. 5736 */ 5737 KEY_PORTTOSADDR(&saidx.src, 0); 5738 KEY_PORTTOSADDR(&saidx.dst, 0); 5739 5740#ifdef IPSEC_NAT_T 5741 /* 5742 * Handle NAT-T info if present. 5743 */ 5744 5745 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5746 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5747 struct sadb_x_nat_t_port *sport, *dport; 5748 5749 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5750 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5751 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5752 __func__)); 5753 return key_senderror(so, m, EINVAL); 5754 } 5755 5756 sport = (struct sadb_x_nat_t_port *) 5757 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5758 dport = (struct sadb_x_nat_t_port *) 5759 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5760 5761 if (sport) 5762 KEY_PORTTOSADDR(&saidx.src, 5763 sport->sadb_x_nat_t_port_port); 5764 if (dport) 5765 KEY_PORTTOSADDR(&saidx.dst, 5766 dport->sadb_x_nat_t_port_port); 5767 } 5768#endif 5769 5770 SAHTREE_LOCK(); 5771 LIST_FOREACH(sah, &V_sahtree, chain) { 5772 if (sah->state == SADB_SASTATE_DEAD) 5773 continue; 5774 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5775 continue; 5776 5777 /* Delete all non-LARVAL SAs. */ 5778 for (stateidx = 0; 5779 stateidx < _ARRAYLEN(saorder_state_alive); 5780 stateidx++) { 5781 state = saorder_state_alive[stateidx]; 5782 if (state == SADB_SASTATE_LARVAL) 5783 continue; 5784 for (sav = LIST_FIRST(&sah->savtree[state]); 5785 sav != NULL; sav = nextsav) { 5786 nextsav = LIST_NEXT(sav, chain); 5787 /* sanity check */ 5788 if (sav->state != state) { 5789 ipseclog((LOG_DEBUG, "%s: invalid " 5790 "sav->state (queue %d SA %d)\n", 5791 __func__, state, sav->state)); 5792 continue; 5793 } 5794 5795 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5796 KEY_FREESAV(&sav); 5797 } 5798 } 5799 } 5800 SAHTREE_UNLOCK(); 5801 { 5802 struct mbuf *n; 5803 struct sadb_msg *newmsg; 5804 5805 /* create new sadb_msg to reply. */ 5806 /* XXX-BZ NAT-T extensions? */ 5807 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5808 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5809 if (!n) 5810 return key_senderror(so, m, ENOBUFS); 5811 5812 if (n->m_len < sizeof(struct sadb_msg)) { 5813 n = m_pullup(n, sizeof(struct sadb_msg)); 5814 if (n == NULL) 5815 return key_senderror(so, m, ENOBUFS); 5816 } 5817 newmsg = mtod(n, struct sadb_msg *); 5818 newmsg->sadb_msg_errno = 0; 5819 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5820 5821 m_freem(m); 5822 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5823 } 5824} 5825 5826/* 5827 * SADB_GET processing 5828 * receive 5829 * <base, SA(*), address(SD)> 5830 * from the ikmpd, and get a SP and a SA to respond, 5831 * and send, 5832 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5833 * (identity(SD),) (sensitivity)> 5834 * to the ikmpd. 5835 * 5836 * m will always be freed. 5837 */ 5838static int 5839key_get(so, m, mhp) 5840 struct socket *so; 5841 struct mbuf *m; 5842 const struct sadb_msghdr *mhp; 5843{ 5844 struct sadb_sa *sa0; 5845 struct sadb_address *src0, *dst0; 5846 struct secasindex saidx; 5847 struct secashead *sah; 5848 struct secasvar *sav = NULL; 5849 u_int16_t proto; 5850 5851 IPSEC_ASSERT(so != NULL, ("null socket")); 5852 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5853 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5854 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5855 5856 /* map satype to proto */ 5857 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5858 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5859 __func__)); 5860 return key_senderror(so, m, EINVAL); 5861 } 5862 5863 if (mhp->ext[SADB_EXT_SA] == NULL || 5864 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5865 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5866 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5867 __func__)); 5868 return key_senderror(so, m, EINVAL); 5869 } 5870 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5871 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5872 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5873 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5874 __func__)); 5875 return key_senderror(so, m, EINVAL); 5876 } 5877 5878 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5879 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5880 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5881 5882 /* XXX boundary check against sa_len */ 5883 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5884 5885 /* 5886 * Make sure the port numbers are zero. 5887 * In case of NAT-T we will update them later if needed. 5888 */ 5889 KEY_PORTTOSADDR(&saidx.src, 0); 5890 KEY_PORTTOSADDR(&saidx.dst, 0); 5891 5892#ifdef IPSEC_NAT_T 5893 /* 5894 * Handle NAT-T info if present. 5895 */ 5896 5897 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5898 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5899 struct sadb_x_nat_t_port *sport, *dport; 5900 5901 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5902 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5903 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5904 __func__)); 5905 return key_senderror(so, m, EINVAL); 5906 } 5907 5908 sport = (struct sadb_x_nat_t_port *) 5909 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5910 dport = (struct sadb_x_nat_t_port *) 5911 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5912 5913 if (sport) 5914 KEY_PORTTOSADDR(&saidx.src, 5915 sport->sadb_x_nat_t_port_port); 5916 if (dport) 5917 KEY_PORTTOSADDR(&saidx.dst, 5918 dport->sadb_x_nat_t_port_port); 5919 } 5920#endif 5921 5922 /* get a SA header */ 5923 SAHTREE_LOCK(); 5924 LIST_FOREACH(sah, &V_sahtree, chain) { 5925 if (sah->state == SADB_SASTATE_DEAD) 5926 continue; 5927 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5928 continue; 5929 5930 /* get a SA with SPI. */ 5931 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5932 if (sav) 5933 break; 5934 } 5935 SAHTREE_UNLOCK(); 5936 if (sah == NULL) { 5937 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5938 return key_senderror(so, m, ENOENT); 5939 } 5940 5941 { 5942 struct mbuf *n; 5943 u_int8_t satype; 5944 5945 /* map proto to satype */ 5946 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5947 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5948 __func__)); 5949 return key_senderror(so, m, EINVAL); 5950 } 5951 5952 /* create new sadb_msg to reply. */ 5953 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5954 mhp->msg->sadb_msg_pid); 5955 if (!n) 5956 return key_senderror(so, m, ENOBUFS); 5957 5958 m_freem(m); 5959 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5960 } 5961} 5962 5963/* XXX make it sysctl-configurable? */ 5964static void 5965key_getcomb_setlifetime(comb) 5966 struct sadb_comb *comb; 5967{ 5968 5969 comb->sadb_comb_soft_allocations = 1; 5970 comb->sadb_comb_hard_allocations = 1; 5971 comb->sadb_comb_soft_bytes = 0; 5972 comb->sadb_comb_hard_bytes = 0; 5973 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5974 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5975 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5976 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5977} 5978 5979/* 5980 * XXX reorder combinations by preference 5981 * XXX no idea if the user wants ESP authentication or not 5982 */ 5983static struct mbuf * 5984key_getcomb_esp() 5985{ 5986 struct sadb_comb *comb; 5987 struct enc_xform *algo; 5988 struct mbuf *result = NULL, *m, *n; 5989 int encmin; 5990 int i, off, o; 5991 int totlen; 5992 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5993 5994 m = NULL; 5995 for (i = 1; i <= SADB_EALG_MAX; i++) { 5996 algo = esp_algorithm_lookup(i); 5997 if (algo == NULL) 5998 continue; 5999 6000 /* discard algorithms with key size smaller than system min */ 6001 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 6002 continue; 6003 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 6004 encmin = V_ipsec_esp_keymin; 6005 else 6006 encmin = _BITS(algo->minkey); 6007 6008 if (V_ipsec_esp_auth) 6009 m = key_getcomb_ah(); 6010 else { 6011 IPSEC_ASSERT(l <= MLEN, 6012 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6013 MGET(m, M_NOWAIT, MT_DATA); 6014 if (m) { 6015 M_ALIGN(m, l); 6016 m->m_len = l; 6017 m->m_next = NULL; 6018 bzero(mtod(m, caddr_t), m->m_len); 6019 } 6020 } 6021 if (!m) 6022 goto fail; 6023 6024 totlen = 0; 6025 for (n = m; n; n = n->m_next) 6026 totlen += n->m_len; 6027 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 6028 6029 for (off = 0; off < totlen; off += l) { 6030 n = m_pulldown(m, off, l, &o); 6031 if (!n) { 6032 /* m is already freed */ 6033 goto fail; 6034 } 6035 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 6036 bzero(comb, sizeof(*comb)); 6037 key_getcomb_setlifetime(comb); 6038 comb->sadb_comb_encrypt = i; 6039 comb->sadb_comb_encrypt_minbits = encmin; 6040 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 6041 } 6042 6043 if (!result) 6044 result = m; 6045 else 6046 m_cat(result, m); 6047 } 6048 6049 return result; 6050 6051 fail: 6052 if (result) 6053 m_freem(result); 6054 return NULL; 6055} 6056 6057static void 6058key_getsizes_ah( 6059 const struct auth_hash *ah, 6060 int alg, 6061 u_int16_t* min, 6062 u_int16_t* max) 6063{ 6064 6065 *min = *max = ah->keysize; 6066 if (ah->keysize == 0) { 6067 /* 6068 * Transform takes arbitrary key size but algorithm 6069 * key size is restricted. Enforce this here. 6070 */ 6071 switch (alg) { 6072 case SADB_X_AALG_MD5: *min = *max = 16; break; 6073 case SADB_X_AALG_SHA: *min = *max = 20; break; 6074 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 6075 case SADB_X_AALG_SHA2_256: *min = *max = 32; break; 6076 case SADB_X_AALG_SHA2_384: *min = *max = 48; break; 6077 case SADB_X_AALG_SHA2_512: *min = *max = 64; break; 6078 default: 6079 DPRINTF(("%s: unknown AH algorithm %u\n", 6080 __func__, alg)); 6081 break; 6082 } 6083 } 6084} 6085 6086/* 6087 * XXX reorder combinations by preference 6088 */ 6089static struct mbuf * 6090key_getcomb_ah() 6091{ 6092 struct sadb_comb *comb; 6093 struct auth_hash *algo; 6094 struct mbuf *m; 6095 u_int16_t minkeysize, maxkeysize; 6096 int i; 6097 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6098 6099 m = NULL; 6100 for (i = 1; i <= SADB_AALG_MAX; i++) { 6101#if 1 6102 /* we prefer HMAC algorithms, not old algorithms */ 6103 if (i != SADB_AALG_SHA1HMAC && 6104 i != SADB_AALG_MD5HMAC && 6105 i != SADB_X_AALG_SHA2_256 && 6106 i != SADB_X_AALG_SHA2_384 && 6107 i != SADB_X_AALG_SHA2_512) 6108 continue; 6109#endif 6110 algo = ah_algorithm_lookup(i); 6111 if (!algo) 6112 continue; 6113 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6114 /* discard algorithms with key size smaller than system min */ 6115 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6116 continue; 6117 6118 if (!m) { 6119 IPSEC_ASSERT(l <= MLEN, 6120 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6121 MGET(m, M_NOWAIT, MT_DATA); 6122 if (m) { 6123 M_ALIGN(m, l); 6124 m->m_len = l; 6125 m->m_next = NULL; 6126 } 6127 } else 6128 M_PREPEND(m, l, M_NOWAIT); 6129 if (!m) 6130 return NULL; 6131 6132 comb = mtod(m, struct sadb_comb *); 6133 bzero(comb, sizeof(*comb)); 6134 key_getcomb_setlifetime(comb); 6135 comb->sadb_comb_auth = i; 6136 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6137 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6138 } 6139 6140 return m; 6141} 6142 6143/* 6144 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6145 * XXX reorder combinations by preference 6146 */ 6147static struct mbuf * 6148key_getcomb_ipcomp() 6149{ 6150 struct sadb_comb *comb; 6151 struct comp_algo *algo; 6152 struct mbuf *m; 6153 int i; 6154 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6155 6156 m = NULL; 6157 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6158 algo = ipcomp_algorithm_lookup(i); 6159 if (!algo) 6160 continue; 6161 6162 if (!m) { 6163 IPSEC_ASSERT(l <= MLEN, 6164 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6165 MGET(m, M_NOWAIT, MT_DATA); 6166 if (m) { 6167 M_ALIGN(m, l); 6168 m->m_len = l; 6169 m->m_next = NULL; 6170 } 6171 } else 6172 M_PREPEND(m, l, M_NOWAIT); 6173 if (!m) 6174 return NULL; 6175 6176 comb = mtod(m, struct sadb_comb *); 6177 bzero(comb, sizeof(*comb)); 6178 key_getcomb_setlifetime(comb); 6179 comb->sadb_comb_encrypt = i; 6180 /* what should we set into sadb_comb_*_{min,max}bits? */ 6181 } 6182 6183 return m; 6184} 6185 6186/* 6187 * XXX no way to pass mode (transport/tunnel) to userland 6188 * XXX replay checking? 6189 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6190 */ 6191static struct mbuf * 6192key_getprop(saidx) 6193 const struct secasindex *saidx; 6194{ 6195 struct sadb_prop *prop; 6196 struct mbuf *m, *n; 6197 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6198 int totlen; 6199 6200 switch (saidx->proto) { 6201 case IPPROTO_ESP: 6202 m = key_getcomb_esp(); 6203 break; 6204 case IPPROTO_AH: 6205 m = key_getcomb_ah(); 6206 break; 6207 case IPPROTO_IPCOMP: 6208 m = key_getcomb_ipcomp(); 6209 break; 6210 default: 6211 return NULL; 6212 } 6213 6214 if (!m) 6215 return NULL; 6216 M_PREPEND(m, l, M_NOWAIT); 6217 if (!m) 6218 return NULL; 6219 6220 totlen = 0; 6221 for (n = m; n; n = n->m_next) 6222 totlen += n->m_len; 6223 6224 prop = mtod(m, struct sadb_prop *); 6225 bzero(prop, sizeof(*prop)); 6226 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6227 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6228 prop->sadb_prop_replay = 32; /* XXX */ 6229 6230 return m; 6231} 6232 6233/* 6234 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6235 * send 6236 * <base, SA, address(SD), (address(P)), x_policy, 6237 * (identity(SD),) (sensitivity,) proposal> 6238 * to KMD, and expect to receive 6239 * <base> with SADB_ACQUIRE if error occured, 6240 * or 6241 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6242 * from KMD by PF_KEY. 6243 * 6244 * XXX x_policy is outside of RFC2367 (KAME extension). 6245 * XXX sensitivity is not supported. 6246 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6247 * see comment for key_getcomb_ipcomp(). 6248 * 6249 * OUT: 6250 * 0 : succeed 6251 * others: error number 6252 */ 6253static int 6254key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6255{ 6256 struct mbuf *result = NULL, *m; 6257 struct secacq *newacq; 6258 u_int8_t satype; 6259 int error = -1; 6260 u_int32_t seq; 6261 6262 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6263 satype = key_proto2satype(saidx->proto); 6264 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6265 6266 /* 6267 * We never do anything about acquirng SA. There is anather 6268 * solution that kernel blocks to send SADB_ACQUIRE message until 6269 * getting something message from IKEd. In later case, to be 6270 * managed with ACQUIRING list. 6271 */ 6272 /* Get an entry to check whether sending message or not. */ 6273 if ((newacq = key_getacq(saidx)) != NULL) { 6274 if (V_key_blockacq_count < newacq->count) { 6275 /* reset counter and do send message. */ 6276 newacq->count = 0; 6277 } else { 6278 /* increment counter and do nothing. */ 6279 newacq->count++; 6280 return 0; 6281 } 6282 } else { 6283 /* make new entry for blocking to send SADB_ACQUIRE. */ 6284 if ((newacq = key_newacq(saidx)) == NULL) 6285 return ENOBUFS; 6286 } 6287 6288 6289 seq = newacq->seq; 6290 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6291 if (!m) { 6292 error = ENOBUFS; 6293 goto fail; 6294 } 6295 result = m; 6296 6297 /* 6298 * No SADB_X_EXT_NAT_T_* here: we do not know 6299 * anything related to NAT-T at this time. 6300 */ 6301 6302 /* set sadb_address for saidx's. */ 6303 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6304 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6305 if (!m) { 6306 error = ENOBUFS; 6307 goto fail; 6308 } 6309 m_cat(result, m); 6310 6311 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6312 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6313 if (!m) { 6314 error = ENOBUFS; 6315 goto fail; 6316 } 6317 m_cat(result, m); 6318 6319 /* XXX proxy address (optional) */ 6320 6321 /* set sadb_x_policy */ 6322 if (sp) { 6323 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6324 if (!m) { 6325 error = ENOBUFS; 6326 goto fail; 6327 } 6328 m_cat(result, m); 6329 } 6330 6331 /* XXX identity (optional) */ 6332#if 0 6333 if (idexttype && fqdn) { 6334 /* create identity extension (FQDN) */ 6335 struct sadb_ident *id; 6336 int fqdnlen; 6337 6338 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6339 id = (struct sadb_ident *)p; 6340 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6341 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6342 id->sadb_ident_exttype = idexttype; 6343 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6344 bcopy(fqdn, id + 1, fqdnlen); 6345 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6346 } 6347 6348 if (idexttype) { 6349 /* create identity extension (USERFQDN) */ 6350 struct sadb_ident *id; 6351 int userfqdnlen; 6352 6353 if (userfqdn) { 6354 /* +1 for terminating-NUL */ 6355 userfqdnlen = strlen(userfqdn) + 1; 6356 } else 6357 userfqdnlen = 0; 6358 id = (struct sadb_ident *)p; 6359 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6360 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6361 id->sadb_ident_exttype = idexttype; 6362 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6363 /* XXX is it correct? */ 6364 if (curproc && curproc->p_cred) 6365 id->sadb_ident_id = curproc->p_cred->p_ruid; 6366 if (userfqdn && userfqdnlen) 6367 bcopy(userfqdn, id + 1, userfqdnlen); 6368 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6369 } 6370#endif 6371 6372 /* XXX sensitivity (optional) */ 6373 6374 /* create proposal/combination extension */ 6375 m = key_getprop(saidx); 6376#if 0 6377 /* 6378 * spec conformant: always attach proposal/combination extension, 6379 * the problem is that we have no way to attach it for ipcomp, 6380 * due to the way sadb_comb is declared in RFC2367. 6381 */ 6382 if (!m) { 6383 error = ENOBUFS; 6384 goto fail; 6385 } 6386 m_cat(result, m); 6387#else 6388 /* 6389 * outside of spec; make proposal/combination extension optional. 6390 */ 6391 if (m) 6392 m_cat(result, m); 6393#endif 6394 6395 if ((result->m_flags & M_PKTHDR) == 0) { 6396 error = EINVAL; 6397 goto fail; 6398 } 6399 6400 if (result->m_len < sizeof(struct sadb_msg)) { 6401 result = m_pullup(result, sizeof(struct sadb_msg)); 6402 if (result == NULL) { 6403 error = ENOBUFS; 6404 goto fail; 6405 } 6406 } 6407 6408 result->m_pkthdr.len = 0; 6409 for (m = result; m; m = m->m_next) 6410 result->m_pkthdr.len += m->m_len; 6411 6412 mtod(result, struct sadb_msg *)->sadb_msg_len = 6413 PFKEY_UNIT64(result->m_pkthdr.len); 6414 6415 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6416 6417 fail: 6418 if (result) 6419 m_freem(result); 6420 return error; 6421} 6422 6423static struct secacq * 6424key_newacq(const struct secasindex *saidx) 6425{ 6426 struct secacq *newacq; 6427 6428 /* get new entry */ 6429 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6430 if (newacq == NULL) { 6431 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6432 return NULL; 6433 } 6434 6435 /* copy secindex */ 6436 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6437 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6438 newacq->created = time_second; 6439 newacq->count = 0; 6440 6441 /* add to acqtree */ 6442 ACQ_LOCK(); 6443 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6444 ACQ_UNLOCK(); 6445 6446 return newacq; 6447} 6448 6449static struct secacq * 6450key_getacq(const struct secasindex *saidx) 6451{ 6452 struct secacq *acq; 6453 6454 ACQ_LOCK(); 6455 LIST_FOREACH(acq, &V_acqtree, chain) { 6456 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6457 break; 6458 } 6459 ACQ_UNLOCK(); 6460 6461 return acq; 6462} 6463 6464static struct secacq * 6465key_getacqbyseq(seq) 6466 u_int32_t seq; 6467{ 6468 struct secacq *acq; 6469 6470 ACQ_LOCK(); 6471 LIST_FOREACH(acq, &V_acqtree, chain) { 6472 if (acq->seq == seq) 6473 break; 6474 } 6475 ACQ_UNLOCK(); 6476 6477 return acq; 6478} 6479 6480static struct secspacq * 6481key_newspacq(spidx) 6482 struct secpolicyindex *spidx; 6483{ 6484 struct secspacq *acq; 6485 6486 /* get new entry */ 6487 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6488 if (acq == NULL) { 6489 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6490 return NULL; 6491 } 6492 6493 /* copy secindex */ 6494 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6495 acq->created = time_second; 6496 acq->count = 0; 6497 6498 /* add to spacqtree */ 6499 SPACQ_LOCK(); 6500 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6501 SPACQ_UNLOCK(); 6502 6503 return acq; 6504} 6505 6506static struct secspacq * 6507key_getspacq(spidx) 6508 struct secpolicyindex *spidx; 6509{ 6510 struct secspacq *acq; 6511 6512 SPACQ_LOCK(); 6513 LIST_FOREACH(acq, &V_spacqtree, chain) { 6514 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6515 /* NB: return holding spacq_lock */ 6516 return acq; 6517 } 6518 } 6519 SPACQ_UNLOCK(); 6520 6521 return NULL; 6522} 6523 6524/* 6525 * SADB_ACQUIRE processing, 6526 * in first situation, is receiving 6527 * <base> 6528 * from the ikmpd, and clear sequence of its secasvar entry. 6529 * 6530 * In second situation, is receiving 6531 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6532 * from a user land process, and return 6533 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6534 * to the socket. 6535 * 6536 * m will always be freed. 6537 */ 6538static int 6539key_acquire2(so, m, mhp) 6540 struct socket *so; 6541 struct mbuf *m; 6542 const struct sadb_msghdr *mhp; 6543{ 6544 const struct sadb_address *src0, *dst0; 6545 struct secasindex saidx; 6546 struct secashead *sah; 6547 u_int16_t proto; 6548 int error; 6549 6550 IPSEC_ASSERT(so != NULL, ("null socket")); 6551 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6552 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6553 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6554 6555 /* 6556 * Error message from KMd. 6557 * We assume that if error was occured in IKEd, the length of PFKEY 6558 * message is equal to the size of sadb_msg structure. 6559 * We do not raise error even if error occured in this function. 6560 */ 6561 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6562 struct secacq *acq; 6563 6564 /* check sequence number */ 6565 if (mhp->msg->sadb_msg_seq == 0) { 6566 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6567 "number.\n", __func__)); 6568 m_freem(m); 6569 return 0; 6570 } 6571 6572 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6573 /* 6574 * the specified larval SA is already gone, or we got 6575 * a bogus sequence number. we can silently ignore it. 6576 */ 6577 m_freem(m); 6578 return 0; 6579 } 6580 6581 /* reset acq counter in order to deletion by timehander. */ 6582 acq->created = time_second; 6583 acq->count = 0; 6584 m_freem(m); 6585 return 0; 6586 } 6587 6588 /* 6589 * This message is from user land. 6590 */ 6591 6592 /* map satype to proto */ 6593 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6594 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6595 __func__)); 6596 return key_senderror(so, m, EINVAL); 6597 } 6598 6599 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6600 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6601 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6602 /* error */ 6603 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6604 __func__)); 6605 return key_senderror(so, m, EINVAL); 6606 } 6607 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6608 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6609 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6610 /* error */ 6611 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6612 __func__)); 6613 return key_senderror(so, m, EINVAL); 6614 } 6615 6616 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6617 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6618 6619 /* XXX boundary check against sa_len */ 6620 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6621 6622 /* 6623 * Make sure the port numbers are zero. 6624 * In case of NAT-T we will update them later if needed. 6625 */ 6626 KEY_PORTTOSADDR(&saidx.src, 0); 6627 KEY_PORTTOSADDR(&saidx.dst, 0); 6628 6629#ifndef IPSEC_NAT_T 6630 /* 6631 * Handle NAT-T info if present. 6632 */ 6633 6634 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6635 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6636 struct sadb_x_nat_t_port *sport, *dport; 6637 6638 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6639 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6640 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6641 __func__)); 6642 return key_senderror(so, m, EINVAL); 6643 } 6644 6645 sport = (struct sadb_x_nat_t_port *) 6646 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6647 dport = (struct sadb_x_nat_t_port *) 6648 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6649 6650 if (sport) 6651 KEY_PORTTOSADDR(&saidx.src, 6652 sport->sadb_x_nat_t_port_port); 6653 if (dport) 6654 KEY_PORTTOSADDR(&saidx.dst, 6655 dport->sadb_x_nat_t_port_port); 6656 } 6657#endif 6658 6659 /* get a SA index */ 6660 SAHTREE_LOCK(); 6661 LIST_FOREACH(sah, &V_sahtree, chain) { 6662 if (sah->state == SADB_SASTATE_DEAD) 6663 continue; 6664 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6665 break; 6666 } 6667 SAHTREE_UNLOCK(); 6668 if (sah != NULL) { 6669 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6670 return key_senderror(so, m, EEXIST); 6671 } 6672 6673 error = key_acquire(&saidx, NULL); 6674 if (error != 0) { 6675 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6676 __func__, mhp->msg->sadb_msg_errno)); 6677 return key_senderror(so, m, error); 6678 } 6679 6680 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6681} 6682 6683/* 6684 * SADB_REGISTER processing. 6685 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6686 * receive 6687 * <base> 6688 * from the ikmpd, and register a socket to send PF_KEY messages, 6689 * and send 6690 * <base, supported> 6691 * to KMD by PF_KEY. 6692 * If socket is detached, must free from regnode. 6693 * 6694 * m will always be freed. 6695 */ 6696static int 6697key_register(so, m, mhp) 6698 struct socket *so; 6699 struct mbuf *m; 6700 const struct sadb_msghdr *mhp; 6701{ 6702 struct secreg *reg, *newreg = 0; 6703 6704 IPSEC_ASSERT(so != NULL, ("null socket")); 6705 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6706 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6707 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6708 6709 /* check for invalid register message */ 6710 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6711 return key_senderror(so, m, EINVAL); 6712 6713 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6714 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6715 goto setmsg; 6716 6717 /* check whether existing or not */ 6718 REGTREE_LOCK(); 6719 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6720 if (reg->so == so) { 6721 REGTREE_UNLOCK(); 6722 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6723 __func__)); 6724 return key_senderror(so, m, EEXIST); 6725 } 6726 } 6727 6728 /* create regnode */ 6729 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6730 if (newreg == NULL) { 6731 REGTREE_UNLOCK(); 6732 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6733 return key_senderror(so, m, ENOBUFS); 6734 } 6735 6736 newreg->so = so; 6737 ((struct keycb *)sotorawcb(so))->kp_registered++; 6738 6739 /* add regnode to regtree. */ 6740 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6741 REGTREE_UNLOCK(); 6742 6743 setmsg: 6744 { 6745 struct mbuf *n; 6746 struct sadb_msg *newmsg; 6747 struct sadb_supported *sup; 6748 u_int len, alen, elen; 6749 int off; 6750 int i; 6751 struct sadb_alg *alg; 6752 6753 /* create new sadb_msg to reply. */ 6754 alen = 0; 6755 for (i = 1; i <= SADB_AALG_MAX; i++) { 6756 if (ah_algorithm_lookup(i)) 6757 alen += sizeof(struct sadb_alg); 6758 } 6759 if (alen) 6760 alen += sizeof(struct sadb_supported); 6761 elen = 0; 6762 for (i = 1; i <= SADB_EALG_MAX; i++) { 6763 if (esp_algorithm_lookup(i)) 6764 elen += sizeof(struct sadb_alg); 6765 } 6766 if (elen) 6767 elen += sizeof(struct sadb_supported); 6768 6769 len = sizeof(struct sadb_msg) + alen + elen; 6770 6771 if (len > MCLBYTES) 6772 return key_senderror(so, m, ENOBUFS); 6773 6774 MGETHDR(n, M_NOWAIT, MT_DATA); 6775 if (len > MHLEN) { 6776 MCLGET(n, M_NOWAIT); 6777 if ((n->m_flags & M_EXT) == 0) { 6778 m_freem(n); 6779 n = NULL; 6780 } 6781 } 6782 if (!n) 6783 return key_senderror(so, m, ENOBUFS); 6784 6785 n->m_pkthdr.len = n->m_len = len; 6786 n->m_next = NULL; 6787 off = 0; 6788 6789 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6790 newmsg = mtod(n, struct sadb_msg *); 6791 newmsg->sadb_msg_errno = 0; 6792 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6793 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6794 6795 /* for authentication algorithm */ 6796 if (alen) { 6797 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6798 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6799 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6800 off += PFKEY_ALIGN8(sizeof(*sup)); 6801 6802 for (i = 1; i <= SADB_AALG_MAX; i++) { 6803 struct auth_hash *aalgo; 6804 u_int16_t minkeysize, maxkeysize; 6805 6806 aalgo = ah_algorithm_lookup(i); 6807 if (!aalgo) 6808 continue; 6809 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6810 alg->sadb_alg_id = i; 6811 alg->sadb_alg_ivlen = 0; 6812 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6813 alg->sadb_alg_minbits = _BITS(minkeysize); 6814 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6815 off += PFKEY_ALIGN8(sizeof(*alg)); 6816 } 6817 } 6818 6819 /* for encryption algorithm */ 6820 if (elen) { 6821 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6822 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6823 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6824 off += PFKEY_ALIGN8(sizeof(*sup)); 6825 6826 for (i = 1; i <= SADB_EALG_MAX; i++) { 6827 struct enc_xform *ealgo; 6828 6829 ealgo = esp_algorithm_lookup(i); 6830 if (!ealgo) 6831 continue; 6832 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6833 alg->sadb_alg_id = i; 6834 alg->sadb_alg_ivlen = ealgo->blocksize; 6835 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6836 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6837 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6838 } 6839 } 6840 6841 IPSEC_ASSERT(off == len, 6842 ("length assumption failed (off %u len %u)", off, len)); 6843 6844 m_freem(m); 6845 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6846 } 6847} 6848 6849/* 6850 * free secreg entry registered. 6851 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6852 */ 6853void 6854key_freereg(struct socket *so) 6855{ 6856 struct secreg *reg; 6857 int i; 6858 6859 IPSEC_ASSERT(so != NULL, ("NULL so")); 6860 6861 /* 6862 * check whether existing or not. 6863 * check all type of SA, because there is a potential that 6864 * one socket is registered to multiple type of SA. 6865 */ 6866 REGTREE_LOCK(); 6867 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6868 LIST_FOREACH(reg, &V_regtree[i], chain) { 6869 if (reg->so == so && __LIST_CHAINED(reg)) { 6870 LIST_REMOVE(reg, chain); 6871 free(reg, M_IPSEC_SAR); 6872 break; 6873 } 6874 } 6875 } 6876 REGTREE_UNLOCK(); 6877} 6878 6879/* 6880 * SADB_EXPIRE processing 6881 * send 6882 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6883 * to KMD by PF_KEY. 6884 * NOTE: We send only soft lifetime extension. 6885 * 6886 * OUT: 0 : succeed 6887 * others : error number 6888 */ 6889static int 6890key_expire(struct secasvar *sav) 6891{ 6892 int satype; 6893 struct mbuf *result = NULL, *m; 6894 int len; 6895 int error = -1; 6896 struct sadb_lifetime *lt; 6897 6898 IPSEC_ASSERT (sav != NULL, ("null sav")); 6899 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6900 6901 /* set msg header */ 6902 satype = key_proto2satype(sav->sah->saidx.proto); 6903 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6904 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6905 if (!m) { 6906 error = ENOBUFS; 6907 goto fail; 6908 } 6909 result = m; 6910 6911 /* create SA extension */ 6912 m = key_setsadbsa(sav); 6913 if (!m) { 6914 error = ENOBUFS; 6915 goto fail; 6916 } 6917 m_cat(result, m); 6918 6919 /* create SA extension */ 6920 m = key_setsadbxsa2(sav->sah->saidx.mode, 6921 sav->replay ? sav->replay->count : 0, 6922 sav->sah->saidx.reqid); 6923 if (!m) { 6924 error = ENOBUFS; 6925 goto fail; 6926 } 6927 m_cat(result, m); 6928 6929 /* create lifetime extension (current and soft) */ 6930 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6931 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 6932 if (m == NULL) { 6933 error = ENOBUFS; 6934 goto fail; 6935 } 6936 m_align(m, len); 6937 m->m_len = len; 6938 bzero(mtod(m, caddr_t), len); 6939 lt = mtod(m, struct sadb_lifetime *); 6940 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6941 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6942 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6943 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6944 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6945 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6946 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6947 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6948 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6949 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6950 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6951 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6952 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6953 m_cat(result, m); 6954 6955 /* set sadb_address for source */ 6956 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6957 &sav->sah->saidx.src.sa, 6958 FULLMASK, IPSEC_ULPROTO_ANY); 6959 if (!m) { 6960 error = ENOBUFS; 6961 goto fail; 6962 } 6963 m_cat(result, m); 6964 6965 /* set sadb_address for destination */ 6966 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6967 &sav->sah->saidx.dst.sa, 6968 FULLMASK, IPSEC_ULPROTO_ANY); 6969 if (!m) { 6970 error = ENOBUFS; 6971 goto fail; 6972 } 6973 m_cat(result, m); 6974 6975 /* 6976 * XXX-BZ Handle NAT-T extensions here. 6977 */ 6978 6979 if ((result->m_flags & M_PKTHDR) == 0) { 6980 error = EINVAL; 6981 goto fail; 6982 } 6983 6984 if (result->m_len < sizeof(struct sadb_msg)) { 6985 result = m_pullup(result, sizeof(struct sadb_msg)); 6986 if (result == NULL) { 6987 error = ENOBUFS; 6988 goto fail; 6989 } 6990 } 6991 6992 result->m_pkthdr.len = 0; 6993 for (m = result; m; m = m->m_next) 6994 result->m_pkthdr.len += m->m_len; 6995 6996 mtod(result, struct sadb_msg *)->sadb_msg_len = 6997 PFKEY_UNIT64(result->m_pkthdr.len); 6998 6999 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 7000 7001 fail: 7002 if (result) 7003 m_freem(result); 7004 return error; 7005} 7006 7007/* 7008 * SADB_FLUSH processing 7009 * receive 7010 * <base> 7011 * from the ikmpd, and free all entries in secastree. 7012 * and send, 7013 * <base> 7014 * to the ikmpd. 7015 * NOTE: to do is only marking SADB_SASTATE_DEAD. 7016 * 7017 * m will always be freed. 7018 */ 7019static int 7020key_flush(so, m, mhp) 7021 struct socket *so; 7022 struct mbuf *m; 7023 const struct sadb_msghdr *mhp; 7024{ 7025 struct sadb_msg *newmsg; 7026 struct secashead *sah, *nextsah; 7027 struct secasvar *sav, *nextsav; 7028 u_int16_t proto; 7029 u_int8_t state; 7030 u_int stateidx; 7031 7032 IPSEC_ASSERT(so != NULL, ("null socket")); 7033 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7034 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7035 7036 /* map satype to proto */ 7037 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7038 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7039 __func__)); 7040 return key_senderror(so, m, EINVAL); 7041 } 7042 7043 /* no SATYPE specified, i.e. flushing all SA. */ 7044 SAHTREE_LOCK(); 7045 for (sah = LIST_FIRST(&V_sahtree); 7046 sah != NULL; 7047 sah = nextsah) { 7048 nextsah = LIST_NEXT(sah, chain); 7049 7050 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7051 && proto != sah->saidx.proto) 7052 continue; 7053 7054 for (stateidx = 0; 7055 stateidx < _ARRAYLEN(saorder_state_alive); 7056 stateidx++) { 7057 state = saorder_state_any[stateidx]; 7058 for (sav = LIST_FIRST(&sah->savtree[state]); 7059 sav != NULL; 7060 sav = nextsav) { 7061 7062 nextsav = LIST_NEXT(sav, chain); 7063 7064 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 7065 KEY_FREESAV(&sav); 7066 } 7067 } 7068 7069 sah->state = SADB_SASTATE_DEAD; 7070 } 7071 SAHTREE_UNLOCK(); 7072 7073 if (m->m_len < sizeof(struct sadb_msg) || 7074 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 7075 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 7076 return key_senderror(so, m, ENOBUFS); 7077 } 7078 7079 if (m->m_next) 7080 m_freem(m->m_next); 7081 m->m_next = NULL; 7082 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 7083 newmsg = mtod(m, struct sadb_msg *); 7084 newmsg->sadb_msg_errno = 0; 7085 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 7086 7087 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7088} 7089 7090/* 7091 * SADB_DUMP processing 7092 * dump all entries including status of DEAD in SAD. 7093 * receive 7094 * <base> 7095 * from the ikmpd, and dump all secasvar leaves 7096 * and send, 7097 * <base> ..... 7098 * to the ikmpd. 7099 * 7100 * m will always be freed. 7101 */ 7102static int 7103key_dump(so, m, mhp) 7104 struct socket *so; 7105 struct mbuf *m; 7106 const struct sadb_msghdr *mhp; 7107{ 7108 struct secashead *sah; 7109 struct secasvar *sav; 7110 u_int16_t proto; 7111 u_int stateidx; 7112 u_int8_t satype; 7113 u_int8_t state; 7114 int cnt; 7115 struct sadb_msg *newmsg; 7116 struct mbuf *n; 7117 7118 IPSEC_ASSERT(so != NULL, ("null socket")); 7119 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7120 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7121 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7122 7123 /* map satype to proto */ 7124 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7125 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7126 __func__)); 7127 return key_senderror(so, m, EINVAL); 7128 } 7129 7130 /* count sav entries to be sent to the userland. */ 7131 cnt = 0; 7132 SAHTREE_LOCK(); 7133 LIST_FOREACH(sah, &V_sahtree, chain) { 7134 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7135 && proto != sah->saidx.proto) 7136 continue; 7137 7138 for (stateidx = 0; 7139 stateidx < _ARRAYLEN(saorder_state_any); 7140 stateidx++) { 7141 state = saorder_state_any[stateidx]; 7142 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7143 cnt++; 7144 } 7145 } 7146 } 7147 7148 if (cnt == 0) { 7149 SAHTREE_UNLOCK(); 7150 return key_senderror(so, m, ENOENT); 7151 } 7152 7153 /* send this to the userland, one at a time. */ 7154 newmsg = NULL; 7155 LIST_FOREACH(sah, &V_sahtree, chain) { 7156 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7157 && proto != sah->saidx.proto) 7158 continue; 7159 7160 /* map proto to satype */ 7161 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7162 SAHTREE_UNLOCK(); 7163 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7164 "SAD.\n", __func__)); 7165 return key_senderror(so, m, EINVAL); 7166 } 7167 7168 for (stateidx = 0; 7169 stateidx < _ARRAYLEN(saorder_state_any); 7170 stateidx++) { 7171 state = saorder_state_any[stateidx]; 7172 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7173 n = key_setdumpsa(sav, SADB_DUMP, satype, 7174 --cnt, mhp->msg->sadb_msg_pid); 7175 if (!n) { 7176 SAHTREE_UNLOCK(); 7177 return key_senderror(so, m, ENOBUFS); 7178 } 7179 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7180 } 7181 } 7182 } 7183 SAHTREE_UNLOCK(); 7184 7185 m_freem(m); 7186 return 0; 7187} 7188 7189/* 7190 * SADB_X_PROMISC processing 7191 * 7192 * m will always be freed. 7193 */ 7194static int 7195key_promisc(so, m, mhp) 7196 struct socket *so; 7197 struct mbuf *m; 7198 const struct sadb_msghdr *mhp; 7199{ 7200 int olen; 7201 7202 IPSEC_ASSERT(so != NULL, ("null socket")); 7203 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7204 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7205 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7206 7207 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7208 7209 if (olen < sizeof(struct sadb_msg)) { 7210#if 1 7211 return key_senderror(so, m, EINVAL); 7212#else 7213 m_freem(m); 7214 return 0; 7215#endif 7216 } else if (olen == sizeof(struct sadb_msg)) { 7217 /* enable/disable promisc mode */ 7218 struct keycb *kp; 7219 7220 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7221 return key_senderror(so, m, EINVAL); 7222 mhp->msg->sadb_msg_errno = 0; 7223 switch (mhp->msg->sadb_msg_satype) { 7224 case 0: 7225 case 1: 7226 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7227 break; 7228 default: 7229 return key_senderror(so, m, EINVAL); 7230 } 7231 7232 /* send the original message back to everyone */ 7233 mhp->msg->sadb_msg_errno = 0; 7234 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7235 } else { 7236 /* send packet as is */ 7237 7238 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7239 7240 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7241 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7242 } 7243} 7244 7245static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 7246 const struct sadb_msghdr *)) = { 7247 NULL, /* SADB_RESERVED */ 7248 key_getspi, /* SADB_GETSPI */ 7249 key_update, /* SADB_UPDATE */ 7250 key_add, /* SADB_ADD */ 7251 key_delete, /* SADB_DELETE */ 7252 key_get, /* SADB_GET */ 7253 key_acquire2, /* SADB_ACQUIRE */ 7254 key_register, /* SADB_REGISTER */ 7255 NULL, /* SADB_EXPIRE */ 7256 key_flush, /* SADB_FLUSH */ 7257 key_dump, /* SADB_DUMP */ 7258 key_promisc, /* SADB_X_PROMISC */ 7259 NULL, /* SADB_X_PCHANGE */ 7260 key_spdadd, /* SADB_X_SPDUPDATE */ 7261 key_spdadd, /* SADB_X_SPDADD */ 7262 key_spddelete, /* SADB_X_SPDDELETE */ 7263 key_spdget, /* SADB_X_SPDGET */ 7264 NULL, /* SADB_X_SPDACQUIRE */ 7265 key_spddump, /* SADB_X_SPDDUMP */ 7266 key_spdflush, /* SADB_X_SPDFLUSH */ 7267 key_spdadd, /* SADB_X_SPDSETIDX */ 7268 NULL, /* SADB_X_SPDEXPIRE */ 7269 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7270}; 7271 7272/* 7273 * parse sadb_msg buffer to process PFKEYv2, 7274 * and create a data to response if needed. 7275 * I think to be dealed with mbuf directly. 7276 * IN: 7277 * msgp : pointer to pointer to a received buffer pulluped. 7278 * This is rewrited to response. 7279 * so : pointer to socket. 7280 * OUT: 7281 * length for buffer to send to user process. 7282 */ 7283int 7284key_parse(m, so) 7285 struct mbuf *m; 7286 struct socket *so; 7287{ 7288 struct sadb_msg *msg; 7289 struct sadb_msghdr mh; 7290 u_int orglen; 7291 int error; 7292 int target; 7293 7294 IPSEC_ASSERT(so != NULL, ("null socket")); 7295 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7296 7297#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7298 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7299 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7300 kdebug_sadb(msg)); 7301#endif 7302 7303 if (m->m_len < sizeof(struct sadb_msg)) { 7304 m = m_pullup(m, sizeof(struct sadb_msg)); 7305 if (!m) 7306 return ENOBUFS; 7307 } 7308 msg = mtod(m, struct sadb_msg *); 7309 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7310 target = KEY_SENDUP_ONE; 7311 7312 if ((m->m_flags & M_PKTHDR) == 0 || 7313 m->m_pkthdr.len != m->m_pkthdr.len) { 7314 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7315 PFKEYSTAT_INC(out_invlen); 7316 error = EINVAL; 7317 goto senderror; 7318 } 7319 7320 if (msg->sadb_msg_version != PF_KEY_V2) { 7321 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7322 __func__, msg->sadb_msg_version)); 7323 PFKEYSTAT_INC(out_invver); 7324 error = EINVAL; 7325 goto senderror; 7326 } 7327 7328 if (msg->sadb_msg_type > SADB_MAX) { 7329 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7330 __func__, msg->sadb_msg_type)); 7331 PFKEYSTAT_INC(out_invmsgtype); 7332 error = EINVAL; 7333 goto senderror; 7334 } 7335 7336 /* for old-fashioned code - should be nuked */ 7337 if (m->m_pkthdr.len > MCLBYTES) { 7338 m_freem(m); 7339 return ENOBUFS; 7340 } 7341 if (m->m_next) { 7342 struct mbuf *n; 7343 7344 MGETHDR(n, M_NOWAIT, MT_DATA); 7345 if (n && m->m_pkthdr.len > MHLEN) { 7346 MCLGET(n, M_NOWAIT); 7347 if ((n->m_flags & M_EXT) == 0) { 7348 m_free(n); 7349 n = NULL; 7350 } 7351 } 7352 if (!n) { 7353 m_freem(m); 7354 return ENOBUFS; 7355 } 7356 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7357 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7358 n->m_next = NULL; 7359 m_freem(m); 7360 m = n; 7361 } 7362 7363 /* align the mbuf chain so that extensions are in contiguous region. */ 7364 error = key_align(m, &mh); 7365 if (error) 7366 return error; 7367 7368 msg = mh.msg; 7369 7370 /* check SA type */ 7371 switch (msg->sadb_msg_satype) { 7372 case SADB_SATYPE_UNSPEC: 7373 switch (msg->sadb_msg_type) { 7374 case SADB_GETSPI: 7375 case SADB_UPDATE: 7376 case SADB_ADD: 7377 case SADB_DELETE: 7378 case SADB_GET: 7379 case SADB_ACQUIRE: 7380 case SADB_EXPIRE: 7381 ipseclog((LOG_DEBUG, "%s: must specify satype " 7382 "when msg type=%u.\n", __func__, 7383 msg->sadb_msg_type)); 7384 PFKEYSTAT_INC(out_invsatype); 7385 error = EINVAL; 7386 goto senderror; 7387 } 7388 break; 7389 case SADB_SATYPE_AH: 7390 case SADB_SATYPE_ESP: 7391 case SADB_X_SATYPE_IPCOMP: 7392 case SADB_X_SATYPE_TCPSIGNATURE: 7393 switch (msg->sadb_msg_type) { 7394 case SADB_X_SPDADD: 7395 case SADB_X_SPDDELETE: 7396 case SADB_X_SPDGET: 7397 case SADB_X_SPDDUMP: 7398 case SADB_X_SPDFLUSH: 7399 case SADB_X_SPDSETIDX: 7400 case SADB_X_SPDUPDATE: 7401 case SADB_X_SPDDELETE2: 7402 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7403 __func__, msg->sadb_msg_type)); 7404 PFKEYSTAT_INC(out_invsatype); 7405 error = EINVAL; 7406 goto senderror; 7407 } 7408 break; 7409 case SADB_SATYPE_RSVP: 7410 case SADB_SATYPE_OSPFV2: 7411 case SADB_SATYPE_RIPV2: 7412 case SADB_SATYPE_MIP: 7413 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7414 __func__, msg->sadb_msg_satype)); 7415 PFKEYSTAT_INC(out_invsatype); 7416 error = EOPNOTSUPP; 7417 goto senderror; 7418 case 1: /* XXX: What does it do? */ 7419 if (msg->sadb_msg_type == SADB_X_PROMISC) 7420 break; 7421 /*FALLTHROUGH*/ 7422 default: 7423 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7424 __func__, msg->sadb_msg_satype)); 7425 PFKEYSTAT_INC(out_invsatype); 7426 error = EINVAL; 7427 goto senderror; 7428 } 7429 7430 /* check field of upper layer protocol and address family */ 7431 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7432 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7433 struct sadb_address *src0, *dst0; 7434 u_int plen; 7435 7436 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7437 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7438 7439 /* check upper layer protocol */ 7440 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7441 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7442 "mismatched.\n", __func__)); 7443 PFKEYSTAT_INC(out_invaddr); 7444 error = EINVAL; 7445 goto senderror; 7446 } 7447 7448 /* check family */ 7449 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7450 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7451 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7452 __func__)); 7453 PFKEYSTAT_INC(out_invaddr); 7454 error = EINVAL; 7455 goto senderror; 7456 } 7457 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7458 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7459 ipseclog((LOG_DEBUG, "%s: address struct size " 7460 "mismatched.\n", __func__)); 7461 PFKEYSTAT_INC(out_invaddr); 7462 error = EINVAL; 7463 goto senderror; 7464 } 7465 7466 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7467 case AF_INET: 7468 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7469 sizeof(struct sockaddr_in)) { 7470 PFKEYSTAT_INC(out_invaddr); 7471 error = EINVAL; 7472 goto senderror; 7473 } 7474 break; 7475 case AF_INET6: 7476 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7477 sizeof(struct sockaddr_in6)) { 7478 PFKEYSTAT_INC(out_invaddr); 7479 error = EINVAL; 7480 goto senderror; 7481 } 7482 break; 7483 default: 7484 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7485 __func__)); 7486 PFKEYSTAT_INC(out_invaddr); 7487 error = EAFNOSUPPORT; 7488 goto senderror; 7489 } 7490 7491 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7492 case AF_INET: 7493 plen = sizeof(struct in_addr) << 3; 7494 break; 7495 case AF_INET6: 7496 plen = sizeof(struct in6_addr) << 3; 7497 break; 7498 default: 7499 plen = 0; /*fool gcc*/ 7500 break; 7501 } 7502 7503 /* check max prefix length */ 7504 if (src0->sadb_address_prefixlen > plen || 7505 dst0->sadb_address_prefixlen > plen) { 7506 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7507 __func__)); 7508 PFKEYSTAT_INC(out_invaddr); 7509 error = EINVAL; 7510 goto senderror; 7511 } 7512 7513 /* 7514 * prefixlen == 0 is valid because there can be a case when 7515 * all addresses are matched. 7516 */ 7517 } 7518 7519 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7520 key_typesw[msg->sadb_msg_type] == NULL) { 7521 PFKEYSTAT_INC(out_invmsgtype); 7522 error = EINVAL; 7523 goto senderror; 7524 } 7525 7526 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7527 7528senderror: 7529 msg->sadb_msg_errno = error; 7530 return key_sendup_mbuf(so, m, target); 7531} 7532 7533static int 7534key_senderror(so, m, code) 7535 struct socket *so; 7536 struct mbuf *m; 7537 int code; 7538{ 7539 struct sadb_msg *msg; 7540 7541 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7542 ("mbuf too small, len %u", m->m_len)); 7543 7544 msg = mtod(m, struct sadb_msg *); 7545 msg->sadb_msg_errno = code; 7546 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7547} 7548 7549/* 7550 * set the pointer to each header into message buffer. 7551 * m will be freed on error. 7552 * XXX larger-than-MCLBYTES extension? 7553 */ 7554static int 7555key_align(m, mhp) 7556 struct mbuf *m; 7557 struct sadb_msghdr *mhp; 7558{ 7559 struct mbuf *n; 7560 struct sadb_ext *ext; 7561 size_t off, end; 7562 int extlen; 7563 int toff; 7564 7565 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7566 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7567 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7568 ("mbuf too small, len %u", m->m_len)); 7569 7570 /* initialize */ 7571 bzero(mhp, sizeof(*mhp)); 7572 7573 mhp->msg = mtod(m, struct sadb_msg *); 7574 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7575 7576 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7577 extlen = end; /*just in case extlen is not updated*/ 7578 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7579 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7580 if (!n) { 7581 /* m is already freed */ 7582 return ENOBUFS; 7583 } 7584 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7585 7586 /* set pointer */ 7587 switch (ext->sadb_ext_type) { 7588 case SADB_EXT_SA: 7589 case SADB_EXT_ADDRESS_SRC: 7590 case SADB_EXT_ADDRESS_DST: 7591 case SADB_EXT_ADDRESS_PROXY: 7592 case SADB_EXT_LIFETIME_CURRENT: 7593 case SADB_EXT_LIFETIME_HARD: 7594 case SADB_EXT_LIFETIME_SOFT: 7595 case SADB_EXT_KEY_AUTH: 7596 case SADB_EXT_KEY_ENCRYPT: 7597 case SADB_EXT_IDENTITY_SRC: 7598 case SADB_EXT_IDENTITY_DST: 7599 case SADB_EXT_SENSITIVITY: 7600 case SADB_EXT_PROPOSAL: 7601 case SADB_EXT_SUPPORTED_AUTH: 7602 case SADB_EXT_SUPPORTED_ENCRYPT: 7603 case SADB_EXT_SPIRANGE: 7604 case SADB_X_EXT_POLICY: 7605 case SADB_X_EXT_SA2: 7606#ifdef IPSEC_NAT_T 7607 case SADB_X_EXT_NAT_T_TYPE: 7608 case SADB_X_EXT_NAT_T_SPORT: 7609 case SADB_X_EXT_NAT_T_DPORT: 7610 case SADB_X_EXT_NAT_T_OAI: 7611 case SADB_X_EXT_NAT_T_OAR: 7612 case SADB_X_EXT_NAT_T_FRAG: 7613#endif 7614 /* duplicate check */ 7615 /* 7616 * XXX Are there duplication payloads of either 7617 * KEY_AUTH or KEY_ENCRYPT ? 7618 */ 7619 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7620 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7621 "%u\n", __func__, ext->sadb_ext_type)); 7622 m_freem(m); 7623 PFKEYSTAT_INC(out_dupext); 7624 return EINVAL; 7625 } 7626 break; 7627 default: 7628 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7629 __func__, ext->sadb_ext_type)); 7630 m_freem(m); 7631 PFKEYSTAT_INC(out_invexttype); 7632 return EINVAL; 7633 } 7634 7635 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7636 7637 if (key_validate_ext(ext, extlen)) { 7638 m_freem(m); 7639 PFKEYSTAT_INC(out_invlen); 7640 return EINVAL; 7641 } 7642 7643 n = m_pulldown(m, off, extlen, &toff); 7644 if (!n) { 7645 /* m is already freed */ 7646 return ENOBUFS; 7647 } 7648 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7649 7650 mhp->ext[ext->sadb_ext_type] = ext; 7651 mhp->extoff[ext->sadb_ext_type] = off; 7652 mhp->extlen[ext->sadb_ext_type] = extlen; 7653 } 7654 7655 if (off != end) { 7656 m_freem(m); 7657 PFKEYSTAT_INC(out_invlen); 7658 return EINVAL; 7659 } 7660 7661 return 0; 7662} 7663 7664static int 7665key_validate_ext(ext, len) 7666 const struct sadb_ext *ext; 7667 int len; 7668{ 7669 const struct sockaddr *sa; 7670 enum { NONE, ADDR } checktype = NONE; 7671 int baselen = 0; 7672 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7673 7674 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7675 return EINVAL; 7676 7677 /* if it does not match minimum/maximum length, bail */ 7678 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7679 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7680 return EINVAL; 7681 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7682 return EINVAL; 7683 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7684 return EINVAL; 7685 7686 /* more checks based on sadb_ext_type XXX need more */ 7687 switch (ext->sadb_ext_type) { 7688 case SADB_EXT_ADDRESS_SRC: 7689 case SADB_EXT_ADDRESS_DST: 7690 case SADB_EXT_ADDRESS_PROXY: 7691 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7692 checktype = ADDR; 7693 break; 7694 case SADB_EXT_IDENTITY_SRC: 7695 case SADB_EXT_IDENTITY_DST: 7696 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7697 SADB_X_IDENTTYPE_ADDR) { 7698 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7699 checktype = ADDR; 7700 } else 7701 checktype = NONE; 7702 break; 7703 default: 7704 checktype = NONE; 7705 break; 7706 } 7707 7708 switch (checktype) { 7709 case NONE: 7710 break; 7711 case ADDR: 7712 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7713 if (len < baselen + sal) 7714 return EINVAL; 7715 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7716 return EINVAL; 7717 break; 7718 } 7719 7720 return 0; 7721} 7722 7723void 7724key_init(void) 7725{ 7726 int i; 7727 7728 for (i = 0; i < IPSEC_DIR_MAX; i++) 7729 LIST_INIT(&V_sptree[i]); 7730 7731 LIST_INIT(&V_sahtree); 7732 7733 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7734 LIST_INIT(&V_regtree[i]); 7735 7736 LIST_INIT(&V_acqtree); 7737 LIST_INIT(&V_spacqtree); 7738 7739 /* system default */ 7740 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7741 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7742 7743 if (!IS_DEFAULT_VNET(curvnet)) 7744 return; 7745 7746 SPTREE_LOCK_INIT(); 7747 REGTREE_LOCK_INIT(); 7748 SAHTREE_LOCK_INIT(); 7749 ACQ_LOCK_INIT(); 7750 SPACQ_LOCK_INIT(); 7751 7752#ifndef IPSEC_DEBUG2 7753 timeout((void *)key_timehandler, (void *)0, hz); 7754#endif /*IPSEC_DEBUG2*/ 7755 7756 /* initialize key statistics */ 7757 keystat.getspi_count = 1; 7758 7759 printf("IPsec: Initialized Security Association Processing.\n"); 7760} 7761 7762#ifdef VIMAGE 7763void 7764key_destroy(void) 7765{ 7766 struct secpolicy *sp, *nextsp; 7767 struct secacq *acq, *nextacq; 7768 struct secspacq *spacq, *nextspacq; 7769 struct secashead *sah, *nextsah; 7770 struct secreg *reg; 7771 int i; 7772 7773 SPTREE_LOCK(); 7774 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7775 for (sp = LIST_FIRST(&V_sptree[i]); 7776 sp != NULL; sp = nextsp) { 7777 nextsp = LIST_NEXT(sp, chain); 7778 if (__LIST_CHAINED(sp)) { 7779 LIST_REMOVE(sp, chain); 7780 free(sp, M_IPSEC_SP); 7781 } 7782 } 7783 } 7784 SPTREE_UNLOCK(); 7785 7786 SAHTREE_LOCK(); 7787 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7788 nextsah = LIST_NEXT(sah, chain); 7789 if (__LIST_CHAINED(sah)) { 7790 LIST_REMOVE(sah, chain); 7791 free(sah, M_IPSEC_SAH); 7792 } 7793 } 7794 SAHTREE_UNLOCK(); 7795 7796 REGTREE_LOCK(); 7797 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7798 LIST_FOREACH(reg, &V_regtree[i], chain) { 7799 if (__LIST_CHAINED(reg)) { 7800 LIST_REMOVE(reg, chain); 7801 free(reg, M_IPSEC_SAR); 7802 break; 7803 } 7804 } 7805 } 7806 REGTREE_UNLOCK(); 7807 7808 ACQ_LOCK(); 7809 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 7810 nextacq = LIST_NEXT(acq, chain); 7811 if (__LIST_CHAINED(acq)) { 7812 LIST_REMOVE(acq, chain); 7813 free(acq, M_IPSEC_SAQ); 7814 } 7815 } 7816 ACQ_UNLOCK(); 7817 7818 SPACQ_LOCK(); 7819 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL; 7820 spacq = nextspacq) { 7821 nextspacq = LIST_NEXT(spacq, chain); 7822 if (__LIST_CHAINED(spacq)) { 7823 LIST_REMOVE(spacq, chain); 7824 free(spacq, M_IPSEC_SAQ); 7825 } 7826 } 7827 SPACQ_UNLOCK(); 7828} 7829#endif 7830 7831/* 7832 * XXX: maybe This function is called after INBOUND IPsec processing. 7833 * 7834 * Special check for tunnel-mode packets. 7835 * We must make some checks for consistency between inner and outer IP header. 7836 * 7837 * xxx more checks to be provided 7838 */ 7839int 7840key_checktunnelsanity(sav, family, src, dst) 7841 struct secasvar *sav; 7842 u_int family; 7843 caddr_t src; 7844 caddr_t dst; 7845{ 7846 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7847 7848 /* XXX: check inner IP header */ 7849 7850 return 1; 7851} 7852 7853/* record data transfer on SA, and update timestamps */ 7854void 7855key_sa_recordxfer(sav, m) 7856 struct secasvar *sav; 7857 struct mbuf *m; 7858{ 7859 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7860 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7861 if (!sav->lft_c) 7862 return; 7863 7864 /* 7865 * XXX Currently, there is a difference of bytes size 7866 * between inbound and outbound processing. 7867 */ 7868 sav->lft_c->bytes += m->m_pkthdr.len; 7869 /* to check bytes lifetime is done in key_timehandler(). */ 7870 7871 /* 7872 * We use the number of packets as the unit of 7873 * allocations. We increment the variable 7874 * whenever {esp,ah}_{in,out}put is called. 7875 */ 7876 sav->lft_c->allocations++; 7877 /* XXX check for expires? */ 7878 7879 /* 7880 * NOTE: We record CURRENT usetime by using wall clock, 7881 * in seconds. HARD and SOFT lifetime are measured by the time 7882 * difference (again in seconds) from usetime. 7883 * 7884 * usetime 7885 * v expire expire 7886 * -----+-----+--------+---> t 7887 * <--------------> HARD 7888 * <-----> SOFT 7889 */ 7890 sav->lft_c->usetime = time_second; 7891 /* XXX check for expires? */ 7892 7893 return; 7894} 7895 7896/* dumb version */ 7897void 7898key_sa_routechange(dst) 7899 struct sockaddr *dst; 7900{ 7901 struct secashead *sah; 7902 struct route *ro; 7903 7904 SAHTREE_LOCK(); 7905 LIST_FOREACH(sah, &V_sahtree, chain) { 7906 ro = &sah->route_cache.sa_route; 7907 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7908 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7909 RTFREE(ro->ro_rt); 7910 ro->ro_rt = (struct rtentry *)NULL; 7911 } 7912 } 7913 SAHTREE_UNLOCK(); 7914} 7915 7916static void 7917key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7918{ 7919 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7920 SAHTREE_LOCK_ASSERT(); 7921 7922 if (sav->state != state) { 7923 if (__LIST_CHAINED(sav)) 7924 LIST_REMOVE(sav, chain); 7925 sav->state = state; 7926 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7927 } 7928} 7929 7930void 7931key_sa_stir_iv(sav) 7932 struct secasvar *sav; 7933{ 7934 7935 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7936 key_randomfill(sav->iv, sav->ivlen); 7937} 7938 7939/* 7940 * Take one of the kernel's security keys and convert it into a PF_KEY 7941 * structure within an mbuf, suitable for sending up to a waiting 7942 * application in user land. 7943 * 7944 * IN: 7945 * src: A pointer to a kernel security key. 7946 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7947 * OUT: 7948 * a valid mbuf or NULL indicating an error 7949 * 7950 */ 7951 7952static struct mbuf * 7953key_setkey(struct seckey *src, u_int16_t exttype) 7954{ 7955 struct mbuf *m; 7956 struct sadb_key *p; 7957 int len; 7958 7959 if (src == NULL) 7960 return NULL; 7961 7962 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7963 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 7964 if (m == NULL) 7965 return NULL; 7966 m_align(m, len); 7967 m->m_len = len; 7968 p = mtod(m, struct sadb_key *); 7969 bzero(p, len); 7970 p->sadb_key_len = PFKEY_UNIT64(len); 7971 p->sadb_key_exttype = exttype; 7972 p->sadb_key_bits = src->bits; 7973 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7974 7975 return m; 7976} 7977 7978/* 7979 * Take one of the kernel's lifetime data structures and convert it 7980 * into a PF_KEY structure within an mbuf, suitable for sending up to 7981 * a waiting application in user land. 7982 * 7983 * IN: 7984 * src: A pointer to a kernel lifetime structure. 7985 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7986 * data structures for more information. 7987 * OUT: 7988 * a valid mbuf or NULL indicating an error 7989 * 7990 */ 7991 7992static struct mbuf * 7993key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7994{ 7995 struct mbuf *m = NULL; 7996 struct sadb_lifetime *p; 7997 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7998 7999 if (src == NULL) 8000 return NULL; 8001 8002 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 8003 if (m == NULL) 8004 return m; 8005 m_align(m, len); 8006 m->m_len = len; 8007 p = mtod(m, struct sadb_lifetime *); 8008 8009 bzero(p, len); 8010 p->sadb_lifetime_len = PFKEY_UNIT64(len); 8011 p->sadb_lifetime_exttype = exttype; 8012 p->sadb_lifetime_allocations = src->allocations; 8013 p->sadb_lifetime_bytes = src->bytes; 8014 p->sadb_lifetime_addtime = src->addtime; 8015 p->sadb_lifetime_usetime = src->usetime; 8016 8017 return m; 8018 8019} 8020