key.c revision 197250
1/* $FreeBSD: head/sys/netipsec/key.c 197250 2009-09-16 11:56:44Z vanhu $ */ 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#ifdef INET 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; 117#define V_key_spi_trycnt VNET(key_spi_trycnt) 118static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 119#define V_key_spi_minval VNET(key_spi_minval) 120static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 121#define V_key_spi_maxval VNET(key_spi_maxval) 122static VNET_DEFINE(u_int32_t, policy_id) = 0; 123#define V_policy_id VNET(policy_id) 124/*interval to initialize randseed,1(m)*/ 125static VNET_DEFINE(u_int, key_int_random) = 60; 126#define V_key_int_random VNET(key_int_random) 127/* interval to expire acquiring, 30(s)*/ 128static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 129#define V_key_larval_lifetime VNET(key_larval_lifetime) 130/* counter for blocking SADB_ACQUIRE.*/ 131static VNET_DEFINE(int, key_blockacq_count) = 10; 132#define V_key_blockacq_count VNET(key_blockacq_count) 133/* lifetime for blocking SADB_ACQUIRE.*/ 134static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 135#define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 136/* preferred old sa rather than new sa.*/ 137static VNET_DEFINE(int, key_preferred_oldsa) = 1; 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; 273#define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 274static VNET_DEFINE(int, ipsec_esp_auth) = 0; 275#define V_ipsec_esp_auth VNET(ipsec_esp_auth) 276static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 277#define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 278 279#ifdef SYSCTL_DECL 280SYSCTL_DECL(_net_key); 281#endif 282 283SYSCTL_VNET_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 284 CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 285 286/* max count of trial for the decision of spi value */ 287SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 288 CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 289 290/* minimum spi value to allocate automatically. */ 291SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MIN_VALUE, 292 spi_minval, CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 293 294/* maximun spi value to allocate automatically. */ 295SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MAX_VALUE, 296 spi_maxval, CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 297 298/* interval to initialize randseed */ 299SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 300 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 301 302/* lifetime for larval SA */ 303SYSCTL_VNET_INT(_net_key, KEYCTL_LARVAL_LIFETIME, 304 larval_lifetime, CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 305 306/* counter for blocking to send SADB_ACQUIRE to IKEd */ 307SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, 308 blockacq_count, CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 309 310/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 311SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 312 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 313 314/* ESP auth */ 315SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 316 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 317 318/* minimum ESP key length */ 319SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 320 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 321 322/* minimum AH key length */ 323SYSCTL_VNET_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 324 CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 325 326/* perfered old SA rather than new SA */ 327SYSCTL_VNET_INT(_net_key, KEYCTL_PREFERED_OLDSA, 328 preferred_oldsa, CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 329 330#define __LIST_CHAINED(elm) \ 331 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 332#define LIST_INSERT_TAIL(head, elm, type, field) \ 333do {\ 334 struct type *curelm = LIST_FIRST(head); \ 335 if (curelm == NULL) {\ 336 LIST_INSERT_HEAD(head, elm, field); \ 337 } else { \ 338 while (LIST_NEXT(curelm, field)) \ 339 curelm = LIST_NEXT(curelm, field);\ 340 LIST_INSERT_AFTER(curelm, elm, field);\ 341 }\ 342} while (0) 343 344#define KEY_CHKSASTATE(head, sav, name) \ 345do { \ 346 if ((head) != (sav)) { \ 347 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 348 (name), (head), (sav))); \ 349 continue; \ 350 } \ 351} while (0) 352 353#define KEY_CHKSPDIR(head, sp, name) \ 354do { \ 355 if ((head) != (sp)) { \ 356 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 357 "anyway continue.\n", \ 358 (name), (head), (sp))); \ 359 } \ 360} while (0) 361 362MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 363MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 364MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 365MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 366MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 367MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 368MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 369 370/* 371 * set parameters into secpolicyindex buffer. 372 * Must allocate secpolicyindex buffer passed to this function. 373 */ 374#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 375do { \ 376 bzero((idx), sizeof(struct secpolicyindex)); \ 377 (idx)->dir = (_dir); \ 378 (idx)->prefs = (ps); \ 379 (idx)->prefd = (pd); \ 380 (idx)->ul_proto = (ulp); \ 381 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 382 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 383} while (0) 384 385/* 386 * set parameters into secasindex buffer. 387 * Must allocate secasindex buffer before calling this function. 388 */ 389#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 390do { \ 391 bzero((idx), sizeof(struct secasindex)); \ 392 (idx)->proto = (p); \ 393 (idx)->mode = (m); \ 394 (idx)->reqid = (r); \ 395 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 396 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 397} while (0) 398 399/* key statistics */ 400struct _keystat { 401 u_long getspi_count; /* the avarage of count to try to get new SPI */ 402} keystat; 403 404struct sadb_msghdr { 405 struct sadb_msg *msg; 406 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 407 int extoff[SADB_EXT_MAX + 1]; 408 int extlen[SADB_EXT_MAX + 1]; 409}; 410 411static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 412static void key_freesp_so __P((struct secpolicy **)); 413static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 414static void key_delsp __P((struct secpolicy *)); 415static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 416static void _key_delsp(struct secpolicy *sp); 417static struct secpolicy *key_getspbyid __P((u_int32_t)); 418static u_int32_t key_newreqid __P((void)); 419static struct mbuf *key_gather_mbuf __P((struct mbuf *, 420 const struct sadb_msghdr *, int, int, ...)); 421static int key_spdadd __P((struct socket *, struct mbuf *, 422 const struct sadb_msghdr *)); 423static u_int32_t key_getnewspid __P((void)); 424static int key_spddelete __P((struct socket *, struct mbuf *, 425 const struct sadb_msghdr *)); 426static int key_spddelete2 __P((struct socket *, struct mbuf *, 427 const struct sadb_msghdr *)); 428static int key_spdget __P((struct socket *, struct mbuf *, 429 const struct sadb_msghdr *)); 430static int key_spdflush __P((struct socket *, struct mbuf *, 431 const struct sadb_msghdr *)); 432static int key_spddump __P((struct socket *, struct mbuf *, 433 const struct sadb_msghdr *)); 434static struct mbuf *key_setdumpsp __P((struct secpolicy *, 435 u_int8_t, u_int32_t, u_int32_t)); 436static u_int key_getspreqmsglen __P((struct secpolicy *)); 437static int key_spdexpire __P((struct secpolicy *)); 438static struct secashead *key_newsah __P((struct secasindex *)); 439static void key_delsah __P((struct secashead *)); 440static struct secasvar *key_newsav __P((struct mbuf *, 441 const struct sadb_msghdr *, struct secashead *, int *, 442 const char*, int)); 443#define KEY_NEWSAV(m, sadb, sah, e) \ 444 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 445static void key_delsav __P((struct secasvar *)); 446static struct secashead *key_getsah __P((struct secasindex *)); 447static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 448static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 449static int key_setsaval __P((struct secasvar *, struct mbuf *, 450 const struct sadb_msghdr *)); 451static int key_mature __P((struct secasvar *)); 452static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 453 u_int8_t, u_int32_t, u_int32_t)); 454static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 455 u_int32_t, pid_t, u_int16_t)); 456static struct mbuf *key_setsadbsa __P((struct secasvar *)); 457static struct mbuf *key_setsadbaddr __P((u_int16_t, 458 const struct sockaddr *, u_int8_t, u_int16_t)); 459#ifdef IPSEC_NAT_T 460static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 461static struct mbuf *key_setsadbxtype(u_int16_t); 462#endif 463static void key_porttosaddr(struct sockaddr *, u_int16_t); 464#define KEY_PORTTOSADDR(saddr, port) \ 465 key_porttosaddr((struct sockaddr *)(saddr), (port)) 466static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 467static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 468 u_int32_t)); 469static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 470 struct malloc_type *); 471static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 472 struct malloc_type *type); 473#ifdef INET6 474static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 475#endif 476 477/* flags for key_cmpsaidx() */ 478#define CMP_HEAD 1 /* protocol, addresses. */ 479#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 480#define CMP_REQID 3 /* additionally HEAD, reaid. */ 481#define CMP_EXACTLY 4 /* all elements. */ 482static int key_cmpsaidx 483 __P((const struct secasindex *, const struct secasindex *, int)); 484 485static int key_cmpspidx_exactly 486 __P((struct secpolicyindex *, struct secpolicyindex *)); 487static int key_cmpspidx_withmask 488 __P((struct secpolicyindex *, struct secpolicyindex *)); 489static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 490static int key_bbcmp __P((const void *, const void *, u_int)); 491static u_int16_t key_satype2proto __P((u_int8_t)); 492static u_int8_t key_proto2satype __P((u_int16_t)); 493 494static int key_getspi __P((struct socket *, struct mbuf *, 495 const struct sadb_msghdr *)); 496static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 497 struct secasindex *)); 498static int key_update __P((struct socket *, struct mbuf *, 499 const struct sadb_msghdr *)); 500#ifdef IPSEC_DOSEQCHECK 501static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 502#endif 503static int key_add __P((struct socket *, struct mbuf *, 504 const struct sadb_msghdr *)); 505static int key_setident __P((struct secashead *, struct mbuf *, 506 const struct sadb_msghdr *)); 507static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 508 const struct sadb_msghdr *)); 509static int key_delete __P((struct socket *, struct mbuf *, 510 const struct sadb_msghdr *)); 511static int key_get __P((struct socket *, struct mbuf *, 512 const struct sadb_msghdr *)); 513 514static void key_getcomb_setlifetime __P((struct sadb_comb *)); 515static struct mbuf *key_getcomb_esp __P((void)); 516static struct mbuf *key_getcomb_ah __P((void)); 517static struct mbuf *key_getcomb_ipcomp __P((void)); 518static struct mbuf *key_getprop __P((const struct secasindex *)); 519 520static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 521static struct secacq *key_newacq __P((const struct secasindex *)); 522static struct secacq *key_getacq __P((const struct secasindex *)); 523static struct secacq *key_getacqbyseq __P((u_int32_t)); 524static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 525static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 526static int key_acquire2 __P((struct socket *, struct mbuf *, 527 const struct sadb_msghdr *)); 528static int key_register __P((struct socket *, struct mbuf *, 529 const struct sadb_msghdr *)); 530static int key_expire __P((struct secasvar *)); 531static int key_flush __P((struct socket *, struct mbuf *, 532 const struct sadb_msghdr *)); 533static int key_dump __P((struct socket *, struct mbuf *, 534 const struct sadb_msghdr *)); 535static int key_promisc __P((struct socket *, struct mbuf *, 536 const struct sadb_msghdr *)); 537static int key_senderror __P((struct socket *, struct mbuf *, int)); 538static int key_validate_ext __P((const struct sadb_ext *, int)); 539static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 540static struct mbuf *key_setlifetime(struct seclifetime *src, 541 u_int16_t exttype); 542static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 543 544#if 0 545static const char *key_getfqdn __P((void)); 546static const char *key_getuserfqdn __P((void)); 547#endif 548static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 549static struct mbuf *key_alloc_mbuf __P((int)); 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; 811 812 IPSEC_ASSERT(isr != NULL, ("null isr")); 813 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 814 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 815 saidx->mode == IPSEC_MODE_TUNNEL, 816 ("unexpected policy %u", saidx->mode)); 817 818 /* 819 * XXX guard against protocol callbacks from the crypto 820 * thread as they reference ipsecrequest.sav which we 821 * temporarily null out below. Need to rethink how we 822 * handle bundled SA's in the callback thread. 823 */ 824 IPSECREQUEST_LOCK_ASSERT(isr); 825 826 /* get current level */ 827 level = ipsec_get_reqlevel(isr); 828#if 0 829 /* 830 * We do allocate new SA only if the state of SA in the holder is 831 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 832 */ 833 if (isr->sav != NULL) { 834 if (isr->sav->sah == NULL) 835 panic("%s: sah is null.\n", __func__); 836 if (isr->sav == (struct secasvar *)LIST_FIRST( 837 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 838 KEY_FREESAV(&isr->sav); 839 isr->sav = NULL; 840 } 841 } 842#else 843 /* 844 * we free any SA stashed in the IPsec request because a different 845 * SA may be involved each time this request is checked, either 846 * because new SAs are being configured, or this request is 847 * associated with an unconnected datagram socket, or this request 848 * is associated with a system default policy. 849 * 850 * The operation may have negative impact to performance. We may 851 * want to check cached SA carefully, rather than picking new SA 852 * every time. 853 */ 854 if (isr->sav != NULL) { 855 KEY_FREESAV(&isr->sav); 856 isr->sav = NULL; 857 } 858#endif 859 860 /* 861 * new SA allocation if no SA found. 862 * key_allocsa_policy should allocate the oldest SA available. 863 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 864 */ 865 if (isr->sav == NULL) 866 isr->sav = key_allocsa_policy(saidx); 867 868 /* When there is SA. */ 869 if (isr->sav != NULL) { 870 if (isr->sav->state != SADB_SASTATE_MATURE && 871 isr->sav->state != SADB_SASTATE_DYING) 872 return EINVAL; 873 return 0; 874 } 875 876 /* there is no SA */ 877 error = key_acquire(saidx, isr->sp); 878 if (error != 0) { 879 /* XXX What should I do ? */ 880 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 881 __func__, error)); 882 return error; 883 } 884 885 if (level != IPSEC_LEVEL_REQUIRE) { 886 /* XXX sigh, the interface to this routine is botched */ 887 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 888 return 0; 889 } else { 890 return ENOENT; 891 } 892} 893 894/* 895 * allocating a SA for policy entry from SAD. 896 * NOTE: searching SAD of aliving state. 897 * OUT: NULL: not found. 898 * others: found and return the pointer. 899 */ 900static struct secasvar * 901key_allocsa_policy(const struct secasindex *saidx) 902{ 903#define N(a) _ARRAYLEN(a) 904 struct secashead *sah; 905 struct secasvar *sav; 906 u_int stateidx, arraysize; 907 const u_int *state_valid; 908 909 state_valid = NULL; /* silence gcc */ 910 arraysize = 0; /* silence gcc */ 911 912 SAHTREE_LOCK(); 913 LIST_FOREACH(sah, &V_sahtree, chain) { 914 if (sah->state == SADB_SASTATE_DEAD) 915 continue; 916 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 917 if (V_key_preferred_oldsa) { 918 state_valid = saorder_state_valid_prefer_old; 919 arraysize = N(saorder_state_valid_prefer_old); 920 } else { 921 state_valid = saorder_state_valid_prefer_new; 922 arraysize = N(saorder_state_valid_prefer_new); 923 } 924 break; 925 } 926 } 927 SAHTREE_UNLOCK(); 928 if (sah == NULL) 929 return NULL; 930 931 /* search valid state */ 932 for (stateidx = 0; stateidx < arraysize; stateidx++) { 933 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 934 if (sav != NULL) 935 return sav; 936 } 937 938 return NULL; 939#undef N 940} 941 942/* 943 * searching SAD with direction, protocol, mode and state. 944 * called by key_allocsa_policy(). 945 * OUT: 946 * NULL : not found 947 * others : found, pointer to a SA. 948 */ 949static struct secasvar * 950key_do_allocsa_policy(struct secashead *sah, u_int state) 951{ 952 struct secasvar *sav, *nextsav, *candidate, *d; 953 954 /* initilize */ 955 candidate = NULL; 956 957 SAHTREE_LOCK(); 958 for (sav = LIST_FIRST(&sah->savtree[state]); 959 sav != NULL; 960 sav = nextsav) { 961 962 nextsav = LIST_NEXT(sav, chain); 963 964 /* sanity check */ 965 KEY_CHKSASTATE(sav->state, state, __func__); 966 967 /* initialize */ 968 if (candidate == NULL) { 969 candidate = sav; 970 continue; 971 } 972 973 /* Which SA is the better ? */ 974 975 IPSEC_ASSERT(candidate->lft_c != NULL, 976 ("null candidate lifetime")); 977 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 978 979 /* What the best method is to compare ? */ 980 if (V_key_preferred_oldsa) { 981 if (candidate->lft_c->addtime > 982 sav->lft_c->addtime) { 983 candidate = sav; 984 } 985 continue; 986 /*NOTREACHED*/ 987 } 988 989 /* preferred new sa rather than old sa */ 990 if (candidate->lft_c->addtime < 991 sav->lft_c->addtime) { 992 d = candidate; 993 candidate = sav; 994 } else 995 d = sav; 996 997 /* 998 * prepared to delete the SA when there is more 999 * suitable candidate and the lifetime of the SA is not 1000 * permanent. 1001 */ 1002 if (d->lft_h->addtime != 0) { 1003 struct mbuf *m, *result; 1004 u_int8_t satype; 1005 1006 key_sa_chgstate(d, SADB_SASTATE_DEAD); 1007 1008 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 1009 1010 satype = key_proto2satype(d->sah->saidx.proto); 1011 if (satype == 0) 1012 goto msgfail; 1013 1014 m = key_setsadbmsg(SADB_DELETE, 0, 1015 satype, 0, 0, d->refcnt - 1); 1016 if (!m) 1017 goto msgfail; 1018 result = m; 1019 1020 /* set sadb_address for saidx's. */ 1021 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1022 &d->sah->saidx.src.sa, 1023 d->sah->saidx.src.sa.sa_len << 3, 1024 IPSEC_ULPROTO_ANY); 1025 if (!m) 1026 goto msgfail; 1027 m_cat(result, m); 1028 1029 /* set sadb_address for saidx's. */ 1030 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1031 &d->sah->saidx.dst.sa, 1032 d->sah->saidx.dst.sa.sa_len << 3, 1033 IPSEC_ULPROTO_ANY); 1034 if (!m) 1035 goto msgfail; 1036 m_cat(result, m); 1037 1038 /* create SA extension */ 1039 m = key_setsadbsa(d); 1040 if (!m) 1041 goto msgfail; 1042 m_cat(result, m); 1043 1044 if (result->m_len < sizeof(struct sadb_msg)) { 1045 result = m_pullup(result, 1046 sizeof(struct sadb_msg)); 1047 if (result == NULL) 1048 goto msgfail; 1049 } 1050 1051 result->m_pkthdr.len = 0; 1052 for (m = result; m; m = m->m_next) 1053 result->m_pkthdr.len += m->m_len; 1054 mtod(result, struct sadb_msg *)->sadb_msg_len = 1055 PFKEY_UNIT64(result->m_pkthdr.len); 1056 1057 if (key_sendup_mbuf(NULL, result, 1058 KEY_SENDUP_REGISTERED)) 1059 goto msgfail; 1060 msgfail: 1061 KEY_FREESAV(&d); 1062 } 1063 } 1064 if (candidate) { 1065 sa_addref(candidate); 1066 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1067 printf("DP %s cause refcnt++:%d SA:%p\n", 1068 __func__, candidate->refcnt, candidate)); 1069 } 1070 SAHTREE_UNLOCK(); 1071 1072 return candidate; 1073} 1074 1075/* 1076 * allocating a usable SA entry for a *INBOUND* packet. 1077 * Must call key_freesav() later. 1078 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1079 * NULL: not found, or error occured. 1080 * 1081 * In the comparison, no source address is used--for RFC2401 conformance. 1082 * To quote, from section 4.1: 1083 * A security association is uniquely identified by a triple consisting 1084 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1085 * security protocol (AH or ESP) identifier. 1086 * Note that, however, we do need to keep source address in IPsec SA. 1087 * IKE specification and PF_KEY specification do assume that we 1088 * keep source address in IPsec SA. We see a tricky situation here. 1089 */ 1090struct secasvar * 1091key_allocsa( 1092 union sockaddr_union *dst, 1093 u_int proto, 1094 u_int32_t spi, 1095 const char* where, int tag) 1096{ 1097 struct secashead *sah; 1098 struct secasvar *sav; 1099 u_int stateidx, arraysize, state; 1100 const u_int *saorder_state_valid; 1101 int chkport; 1102 1103 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1104 1105 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1106 printf("DP %s from %s:%u\n", __func__, where, tag)); 1107 1108#ifdef IPSEC_NAT_T 1109 chkport = (dst->sa.sa_family == AF_INET && 1110 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1111 dst->sin.sin_port != 0); 1112#else 1113 chkport = 0; 1114#endif 1115 1116 /* 1117 * searching SAD. 1118 * XXX: to be checked internal IP header somewhere. Also when 1119 * IPsec tunnel packet is received. But ESP tunnel mode is 1120 * encrypted so we can't check internal IP header. 1121 */ 1122 SAHTREE_LOCK(); 1123 if (V_key_preferred_oldsa) { 1124 saorder_state_valid = saorder_state_valid_prefer_old; 1125 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1126 } else { 1127 saorder_state_valid = saorder_state_valid_prefer_new; 1128 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1129 } 1130 LIST_FOREACH(sah, &V_sahtree, chain) { 1131 /* search valid state */ 1132 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1133 state = saorder_state_valid[stateidx]; 1134 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1135 /* sanity check */ 1136 KEY_CHKSASTATE(sav->state, state, __func__); 1137 /* do not return entries w/ unusable state */ 1138 if (sav->state != SADB_SASTATE_MATURE && 1139 sav->state != SADB_SASTATE_DYING) 1140 continue; 1141 if (proto != sav->sah->saidx.proto) 1142 continue; 1143 if (spi != sav->spi) 1144 continue; 1145#if 0 /* don't check src */ 1146 /* check src address */ 1147 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, chkport) != 0) 1148 continue; 1149#endif 1150 /* check dst address */ 1151 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, chkport) != 0) 1152 continue; 1153 sa_addref(sav); 1154 goto done; 1155 } 1156 } 1157 } 1158 sav = NULL; 1159done: 1160 SAHTREE_UNLOCK(); 1161 1162 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1163 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1164 sav, sav ? sav->refcnt : 0)); 1165 return sav; 1166} 1167 1168/* 1169 * Must be called after calling key_allocsp(). 1170 * For both the packet without socket and key_freeso(). 1171 */ 1172void 1173_key_freesp(struct secpolicy **spp, const char* where, int tag) 1174{ 1175 struct secpolicy *sp = *spp; 1176 1177 IPSEC_ASSERT(sp != NULL, ("null sp")); 1178 1179 SPTREE_LOCK(); 1180 SP_DELREF(sp); 1181 1182 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1183 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1184 __func__, sp, sp->id, where, tag, sp->refcnt)); 1185 1186 if (sp->refcnt == 0) { 1187 *spp = NULL; 1188 key_delsp(sp); 1189 } 1190 SPTREE_UNLOCK(); 1191} 1192 1193/* 1194 * Must be called after calling key_allocsp(). 1195 * For the packet with socket. 1196 */ 1197void 1198key_freeso(struct socket *so) 1199{ 1200 IPSEC_ASSERT(so != NULL, ("null so")); 1201 1202 switch (so->so_proto->pr_domain->dom_family) { 1203#if defined(INET) || defined(INET6) 1204#ifdef INET 1205 case PF_INET: 1206#endif 1207#ifdef INET6 1208 case PF_INET6: 1209#endif 1210 { 1211 struct inpcb *pcb = sotoinpcb(so); 1212 1213 /* Does it have a PCB ? */ 1214 if (pcb == NULL) 1215 return; 1216 key_freesp_so(&pcb->inp_sp->sp_in); 1217 key_freesp_so(&pcb->inp_sp->sp_out); 1218 } 1219 break; 1220#endif /* INET || INET6 */ 1221 default: 1222 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1223 __func__, so->so_proto->pr_domain->dom_family)); 1224 return; 1225 } 1226} 1227 1228static void 1229key_freesp_so(struct secpolicy **sp) 1230{ 1231 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1232 1233 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1234 (*sp)->policy == IPSEC_POLICY_BYPASS) 1235 return; 1236 1237 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1238 ("invalid policy %u", (*sp)->policy)); 1239 KEY_FREESP(sp); 1240} 1241 1242/* 1243 * Must be called after calling key_allocsa(). 1244 * This function is called by key_freesp() to free some SA allocated 1245 * for a policy. 1246 */ 1247void 1248key_freesav(struct secasvar **psav, const char* where, int tag) 1249{ 1250 struct secasvar *sav = *psav; 1251 1252 IPSEC_ASSERT(sav != NULL, ("null sav")); 1253 1254 if (sa_delref(sav)) { 1255 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1256 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1257 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1258 *psav = NULL; 1259 key_delsav(sav); 1260 } else { 1261 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1262 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1263 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1264 } 1265} 1266 1267/* %%% SPD management */ 1268/* 1269 * free security policy entry. 1270 */ 1271static void 1272key_delsp(struct secpolicy *sp) 1273{ 1274 struct ipsecrequest *isr, *nextisr; 1275 1276 IPSEC_ASSERT(sp != NULL, ("null sp")); 1277 SPTREE_LOCK_ASSERT(); 1278 1279 sp->state = IPSEC_SPSTATE_DEAD; 1280 1281 IPSEC_ASSERT(sp->refcnt == 0, 1282 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1283 1284 /* remove from SP index */ 1285 if (__LIST_CHAINED(sp)) 1286 LIST_REMOVE(sp, chain); 1287 1288 for (isr = sp->req; isr != NULL; isr = nextisr) { 1289 if (isr->sav != NULL) { 1290 KEY_FREESAV(&isr->sav); 1291 isr->sav = NULL; 1292 } 1293 1294 nextisr = isr->next; 1295 ipsec_delisr(isr); 1296 } 1297 _key_delsp(sp); 1298} 1299 1300/* 1301 * search SPD 1302 * OUT: NULL : not found 1303 * others : found, pointer to a SP. 1304 */ 1305static struct secpolicy * 1306key_getsp(struct secpolicyindex *spidx) 1307{ 1308 struct secpolicy *sp; 1309 1310 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1311 1312 SPTREE_LOCK(); 1313 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1314 if (sp->state == IPSEC_SPSTATE_DEAD) 1315 continue; 1316 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1317 SP_ADDREF(sp); 1318 break; 1319 } 1320 } 1321 SPTREE_UNLOCK(); 1322 1323 return sp; 1324} 1325 1326/* 1327 * get SP by index. 1328 * OUT: NULL : not found 1329 * others : found, pointer to a SP. 1330 */ 1331static struct secpolicy * 1332key_getspbyid(u_int32_t id) 1333{ 1334 struct secpolicy *sp; 1335 1336 SPTREE_LOCK(); 1337 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1338 if (sp->state == IPSEC_SPSTATE_DEAD) 1339 continue; 1340 if (sp->id == id) { 1341 SP_ADDREF(sp); 1342 goto done; 1343 } 1344 } 1345 1346 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1347 if (sp->state == IPSEC_SPSTATE_DEAD) 1348 continue; 1349 if (sp->id == id) { 1350 SP_ADDREF(sp); 1351 goto done; 1352 } 1353 } 1354done: 1355 SPTREE_UNLOCK(); 1356 1357 return sp; 1358} 1359 1360struct secpolicy * 1361key_newsp(const char* where, int tag) 1362{ 1363 struct secpolicy *newsp = NULL; 1364 1365 newsp = (struct secpolicy *) 1366 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1367 if (newsp) { 1368 SECPOLICY_LOCK_INIT(newsp); 1369 newsp->refcnt = 1; 1370 newsp->req = NULL; 1371 } 1372 1373 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1374 printf("DP %s from %s:%u return SP:%p\n", __func__, 1375 where, tag, newsp)); 1376 return newsp; 1377} 1378 1379static void 1380_key_delsp(struct secpolicy *sp) 1381{ 1382 SECPOLICY_LOCK_DESTROY(sp); 1383 free(sp, M_IPSEC_SP); 1384} 1385 1386/* 1387 * create secpolicy structure from sadb_x_policy structure. 1388 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1389 * so must be set properly later. 1390 */ 1391struct secpolicy * 1392key_msg2sp(xpl0, len, error) 1393 struct sadb_x_policy *xpl0; 1394 size_t len; 1395 int *error; 1396{ 1397 struct secpolicy *newsp; 1398 1399 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1400 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1401 1402 if (len != PFKEY_EXTLEN(xpl0)) { 1403 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1404 *error = EINVAL; 1405 return NULL; 1406 } 1407 1408 if ((newsp = KEY_NEWSP()) == NULL) { 1409 *error = ENOBUFS; 1410 return NULL; 1411 } 1412 1413 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1414 newsp->policy = xpl0->sadb_x_policy_type; 1415 1416 /* check policy */ 1417 switch (xpl0->sadb_x_policy_type) { 1418 case IPSEC_POLICY_DISCARD: 1419 case IPSEC_POLICY_NONE: 1420 case IPSEC_POLICY_ENTRUST: 1421 case IPSEC_POLICY_BYPASS: 1422 newsp->req = NULL; 1423 break; 1424 1425 case IPSEC_POLICY_IPSEC: 1426 { 1427 int tlen; 1428 struct sadb_x_ipsecrequest *xisr; 1429 struct ipsecrequest **p_isr = &newsp->req; 1430 1431 /* validity check */ 1432 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1433 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1434 __func__)); 1435 KEY_FREESP(&newsp); 1436 *error = EINVAL; 1437 return NULL; 1438 } 1439 1440 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1441 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1442 1443 while (tlen > 0) { 1444 /* length check */ 1445 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1446 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1447 "length.\n", __func__)); 1448 KEY_FREESP(&newsp); 1449 *error = EINVAL; 1450 return NULL; 1451 } 1452 1453 /* allocate request buffer */ 1454 /* NB: data structure is zero'd */ 1455 *p_isr = ipsec_newisr(); 1456 if ((*p_isr) == NULL) { 1457 ipseclog((LOG_DEBUG, 1458 "%s: No more memory.\n", __func__)); 1459 KEY_FREESP(&newsp); 1460 *error = ENOBUFS; 1461 return NULL; 1462 } 1463 1464 /* set values */ 1465 switch (xisr->sadb_x_ipsecrequest_proto) { 1466 case IPPROTO_ESP: 1467 case IPPROTO_AH: 1468 case IPPROTO_IPCOMP: 1469 break; 1470 default: 1471 ipseclog((LOG_DEBUG, 1472 "%s: invalid proto type=%u\n", __func__, 1473 xisr->sadb_x_ipsecrequest_proto)); 1474 KEY_FREESP(&newsp); 1475 *error = EPROTONOSUPPORT; 1476 return NULL; 1477 } 1478 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1479 1480 switch (xisr->sadb_x_ipsecrequest_mode) { 1481 case IPSEC_MODE_TRANSPORT: 1482 case IPSEC_MODE_TUNNEL: 1483 break; 1484 case IPSEC_MODE_ANY: 1485 default: 1486 ipseclog((LOG_DEBUG, 1487 "%s: invalid mode=%u\n", __func__, 1488 xisr->sadb_x_ipsecrequest_mode)); 1489 KEY_FREESP(&newsp); 1490 *error = EINVAL; 1491 return NULL; 1492 } 1493 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1494 1495 switch (xisr->sadb_x_ipsecrequest_level) { 1496 case IPSEC_LEVEL_DEFAULT: 1497 case IPSEC_LEVEL_USE: 1498 case IPSEC_LEVEL_REQUIRE: 1499 break; 1500 case IPSEC_LEVEL_UNIQUE: 1501 /* validity check */ 1502 /* 1503 * If range violation of reqid, kernel will 1504 * update it, don't refuse it. 1505 */ 1506 if (xisr->sadb_x_ipsecrequest_reqid 1507 > IPSEC_MANUAL_REQID_MAX) { 1508 ipseclog((LOG_DEBUG, 1509 "%s: reqid=%d range " 1510 "violation, updated by kernel.\n", 1511 __func__, 1512 xisr->sadb_x_ipsecrequest_reqid)); 1513 xisr->sadb_x_ipsecrequest_reqid = 0; 1514 } 1515 1516 /* allocate new reqid id if reqid is zero. */ 1517 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1518 u_int32_t reqid; 1519 if ((reqid = key_newreqid()) == 0) { 1520 KEY_FREESP(&newsp); 1521 *error = ENOBUFS; 1522 return NULL; 1523 } 1524 (*p_isr)->saidx.reqid = reqid; 1525 xisr->sadb_x_ipsecrequest_reqid = reqid; 1526 } else { 1527 /* set it for manual keying. */ 1528 (*p_isr)->saidx.reqid = 1529 xisr->sadb_x_ipsecrequest_reqid; 1530 } 1531 break; 1532 1533 default: 1534 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1535 __func__, 1536 xisr->sadb_x_ipsecrequest_level)); 1537 KEY_FREESP(&newsp); 1538 *error = EINVAL; 1539 return NULL; 1540 } 1541 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1542 1543 /* set IP addresses if there */ 1544 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1545 struct sockaddr *paddr; 1546 1547 paddr = (struct sockaddr *)(xisr + 1); 1548 1549 /* validity check */ 1550 if (paddr->sa_len 1551 > sizeof((*p_isr)->saidx.src)) { 1552 ipseclog((LOG_DEBUG, "%s: invalid " 1553 "request address length.\n", 1554 __func__)); 1555 KEY_FREESP(&newsp); 1556 *error = EINVAL; 1557 return NULL; 1558 } 1559 bcopy(paddr, &(*p_isr)->saidx.src, 1560 paddr->sa_len); 1561 1562 paddr = (struct sockaddr *)((caddr_t)paddr 1563 + paddr->sa_len); 1564 1565 /* validity check */ 1566 if (paddr->sa_len 1567 > sizeof((*p_isr)->saidx.dst)) { 1568 ipseclog((LOG_DEBUG, "%s: invalid " 1569 "request address length.\n", 1570 __func__)); 1571 KEY_FREESP(&newsp); 1572 *error = EINVAL; 1573 return NULL; 1574 } 1575 bcopy(paddr, &(*p_isr)->saidx.dst, 1576 paddr->sa_len); 1577 } 1578 1579 (*p_isr)->sp = newsp; 1580 1581 /* initialization for the next. */ 1582 p_isr = &(*p_isr)->next; 1583 tlen -= xisr->sadb_x_ipsecrequest_len; 1584 1585 /* validity check */ 1586 if (tlen < 0) { 1587 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1588 __func__)); 1589 KEY_FREESP(&newsp); 1590 *error = EINVAL; 1591 return NULL; 1592 } 1593 1594 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1595 + xisr->sadb_x_ipsecrequest_len); 1596 } 1597 } 1598 break; 1599 default: 1600 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1601 KEY_FREESP(&newsp); 1602 *error = EINVAL; 1603 return NULL; 1604 } 1605 1606 *error = 0; 1607 return newsp; 1608} 1609 1610static u_int32_t 1611key_newreqid() 1612{ 1613 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1614 1615 auto_reqid = (auto_reqid == ~0 1616 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1617 1618 /* XXX should be unique check */ 1619 1620 return auto_reqid; 1621} 1622 1623/* 1624 * copy secpolicy struct to sadb_x_policy structure indicated. 1625 */ 1626struct mbuf * 1627key_sp2msg(sp) 1628 struct secpolicy *sp; 1629{ 1630 struct sadb_x_policy *xpl; 1631 int tlen; 1632 caddr_t p; 1633 struct mbuf *m; 1634 1635 IPSEC_ASSERT(sp != NULL, ("null policy")); 1636 1637 tlen = key_getspreqmsglen(sp); 1638 1639 m = key_alloc_mbuf(tlen); 1640 if (!m || m->m_next) { /*XXX*/ 1641 if (m) 1642 m_freem(m); 1643 return NULL; 1644 } 1645 1646 m->m_len = tlen; 1647 m->m_next = NULL; 1648 xpl = mtod(m, struct sadb_x_policy *); 1649 bzero(xpl, tlen); 1650 1651 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1652 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1653 xpl->sadb_x_policy_type = sp->policy; 1654 xpl->sadb_x_policy_dir = sp->spidx.dir; 1655 xpl->sadb_x_policy_id = sp->id; 1656 p = (caddr_t)xpl + sizeof(*xpl); 1657 1658 /* if is the policy for ipsec ? */ 1659 if (sp->policy == IPSEC_POLICY_IPSEC) { 1660 struct sadb_x_ipsecrequest *xisr; 1661 struct ipsecrequest *isr; 1662 1663 for (isr = sp->req; isr != NULL; isr = isr->next) { 1664 1665 xisr = (struct sadb_x_ipsecrequest *)p; 1666 1667 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1668 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1669 xisr->sadb_x_ipsecrequest_level = isr->level; 1670 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1671 1672 p += sizeof(*xisr); 1673 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1674 p += isr->saidx.src.sa.sa_len; 1675 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1676 p += isr->saidx.src.sa.sa_len; 1677 1678 xisr->sadb_x_ipsecrequest_len = 1679 PFKEY_ALIGN8(sizeof(*xisr) 1680 + isr->saidx.src.sa.sa_len 1681 + isr->saidx.dst.sa.sa_len); 1682 } 1683 } 1684 1685 return m; 1686} 1687 1688/* m will not be freed nor modified */ 1689static struct mbuf * 1690#ifdef __STDC__ 1691key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1692 int ndeep, int nitem, ...) 1693#else 1694key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1695 struct mbuf *m; 1696 const struct sadb_msghdr *mhp; 1697 int ndeep; 1698 int nitem; 1699 va_dcl 1700#endif 1701{ 1702 va_list ap; 1703 int idx; 1704 int i; 1705 struct mbuf *result = NULL, *n; 1706 int len; 1707 1708 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1709 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1710 1711 va_start(ap, nitem); 1712 for (i = 0; i < nitem; i++) { 1713 idx = va_arg(ap, int); 1714 if (idx < 0 || idx > SADB_EXT_MAX) 1715 goto fail; 1716 /* don't attempt to pull empty extension */ 1717 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1718 continue; 1719 if (idx != SADB_EXT_RESERVED && 1720 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1721 continue; 1722 1723 if (idx == SADB_EXT_RESERVED) { 1724 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1725 1726 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1727 1728 MGETHDR(n, M_DONTWAIT, MT_DATA); 1729 if (!n) 1730 goto fail; 1731 n->m_len = len; 1732 n->m_next = NULL; 1733 m_copydata(m, 0, sizeof(struct sadb_msg), 1734 mtod(n, caddr_t)); 1735 } else if (i < ndeep) { 1736 len = mhp->extlen[idx]; 1737 n = key_alloc_mbuf(len); 1738 if (!n || n->m_next) { /*XXX*/ 1739 if (n) 1740 m_freem(n); 1741 goto fail; 1742 } 1743 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1744 mtod(n, caddr_t)); 1745 } else { 1746 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1747 M_DONTWAIT); 1748 } 1749 if (n == NULL) 1750 goto fail; 1751 1752 if (result) 1753 m_cat(result, n); 1754 else 1755 result = n; 1756 } 1757 va_end(ap); 1758 1759 if ((result->m_flags & M_PKTHDR) != 0) { 1760 result->m_pkthdr.len = 0; 1761 for (n = result; n; n = n->m_next) 1762 result->m_pkthdr.len += n->m_len; 1763 } 1764 1765 return result; 1766 1767fail: 1768 m_freem(result); 1769 return NULL; 1770} 1771 1772/* 1773 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1774 * add an entry to SP database, when received 1775 * <base, address(SD), (lifetime(H),) policy> 1776 * from the user(?). 1777 * Adding to SP database, 1778 * and send 1779 * <base, address(SD), (lifetime(H),) policy> 1780 * to the socket which was send. 1781 * 1782 * SPDADD set a unique policy entry. 1783 * SPDSETIDX like SPDADD without a part of policy requests. 1784 * SPDUPDATE replace a unique policy entry. 1785 * 1786 * m will always be freed. 1787 */ 1788static int 1789key_spdadd(so, m, mhp) 1790 struct socket *so; 1791 struct mbuf *m; 1792 const struct sadb_msghdr *mhp; 1793{ 1794 struct sadb_address *src0, *dst0; 1795 struct sadb_x_policy *xpl0, *xpl; 1796 struct sadb_lifetime *lft = NULL; 1797 struct secpolicyindex spidx; 1798 struct secpolicy *newsp; 1799 int error; 1800 1801 IPSEC_ASSERT(so != NULL, ("null socket")); 1802 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1803 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1804 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1805 1806 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1807 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1808 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1809 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1810 return key_senderror(so, m, EINVAL); 1811 } 1812 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1813 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1814 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1815 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1816 __func__)); 1817 return key_senderror(so, m, EINVAL); 1818 } 1819 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1820 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1821 < sizeof(struct sadb_lifetime)) { 1822 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1823 __func__)); 1824 return key_senderror(so, m, EINVAL); 1825 } 1826 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1827 } 1828 1829 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1830 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1831 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1832 1833 /* 1834 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1835 * we are processing traffic endpoints. 1836 */ 1837 1838 /* make secindex */ 1839 /* XXX boundary check against sa_len */ 1840 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1841 src0 + 1, 1842 dst0 + 1, 1843 src0->sadb_address_prefixlen, 1844 dst0->sadb_address_prefixlen, 1845 src0->sadb_address_proto, 1846 &spidx); 1847 1848 /* checking the direciton. */ 1849 switch (xpl0->sadb_x_policy_dir) { 1850 case IPSEC_DIR_INBOUND: 1851 case IPSEC_DIR_OUTBOUND: 1852 break; 1853 default: 1854 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1855 mhp->msg->sadb_msg_errno = EINVAL; 1856 return 0; 1857 } 1858 1859 /* check policy */ 1860 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1861 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1862 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1863 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1864 return key_senderror(so, m, EINVAL); 1865 } 1866 1867 /* policy requests are mandatory when action is ipsec. */ 1868 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1869 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1870 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1871 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1872 __func__)); 1873 return key_senderror(so, m, EINVAL); 1874 } 1875 1876 /* 1877 * checking there is SP already or not. 1878 * SPDUPDATE doesn't depend on whether there is a SP or not. 1879 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1880 * then error. 1881 */ 1882 newsp = key_getsp(&spidx); 1883 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1884 if (newsp) { 1885 newsp->state = IPSEC_SPSTATE_DEAD; 1886 KEY_FREESP(&newsp); 1887 } 1888 } else { 1889 if (newsp != NULL) { 1890 KEY_FREESP(&newsp); 1891 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1892 __func__)); 1893 return key_senderror(so, m, EEXIST); 1894 } 1895 } 1896 1897 /* allocation new SP entry */ 1898 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1899 return key_senderror(so, m, error); 1900 } 1901 1902 if ((newsp->id = key_getnewspid()) == 0) { 1903 _key_delsp(newsp); 1904 return key_senderror(so, m, ENOBUFS); 1905 } 1906 1907 /* XXX boundary check against sa_len */ 1908 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1909 src0 + 1, 1910 dst0 + 1, 1911 src0->sadb_address_prefixlen, 1912 dst0->sadb_address_prefixlen, 1913 src0->sadb_address_proto, 1914 &newsp->spidx); 1915 1916 /* sanity check on addr pair */ 1917 if (((struct sockaddr *)(src0 + 1))->sa_family != 1918 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1919 _key_delsp(newsp); 1920 return key_senderror(so, m, EINVAL); 1921 } 1922 if (((struct sockaddr *)(src0 + 1))->sa_len != 1923 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1924 _key_delsp(newsp); 1925 return key_senderror(so, m, EINVAL); 1926 } 1927#if 1 1928 if (newsp->req && newsp->req->saidx.src.sa.sa_family && newsp->req->saidx.dst.sa.sa_family) { 1929 if (newsp->req->saidx.src.sa.sa_family != newsp->req->saidx.dst.sa.sa_family) { 1930 _key_delsp(newsp); 1931 return key_senderror(so, m, EINVAL); 1932 } 1933 } 1934#endif 1935 1936 newsp->created = time_second; 1937 newsp->lastused = newsp->created; 1938 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1939 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1940 1941 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1942 newsp->state = IPSEC_SPSTATE_ALIVE; 1943 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1944 1945 /* delete the entry in spacqtree */ 1946 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1947 struct secspacq *spacq = key_getspacq(&spidx); 1948 if (spacq != NULL) { 1949 /* reset counter in order to deletion by timehandler. */ 1950 spacq->created = time_second; 1951 spacq->count = 0; 1952 SPACQ_UNLOCK(); 1953 } 1954 } 1955 1956 { 1957 struct mbuf *n, *mpolicy; 1958 struct sadb_msg *newmsg; 1959 int off; 1960 1961 /* 1962 * Note: do not send SADB_X_EXT_NAT_T_* here: 1963 * we are sending traffic endpoints. 1964 */ 1965 1966 /* create new sadb_msg to reply. */ 1967 if (lft) { 1968 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1969 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1970 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1971 } else { 1972 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1973 SADB_X_EXT_POLICY, 1974 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1975 } 1976 if (!n) 1977 return key_senderror(so, m, ENOBUFS); 1978 1979 if (n->m_len < sizeof(*newmsg)) { 1980 n = m_pullup(n, sizeof(*newmsg)); 1981 if (!n) 1982 return key_senderror(so, m, ENOBUFS); 1983 } 1984 newmsg = mtod(n, struct sadb_msg *); 1985 newmsg->sadb_msg_errno = 0; 1986 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1987 1988 off = 0; 1989 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1990 sizeof(*xpl), &off); 1991 if (mpolicy == NULL) { 1992 /* n is already freed */ 1993 return key_senderror(so, m, ENOBUFS); 1994 } 1995 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1996 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1997 m_freem(n); 1998 return key_senderror(so, m, EINVAL); 1999 } 2000 xpl->sadb_x_policy_id = newsp->id; 2001 2002 m_freem(m); 2003 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2004 } 2005} 2006 2007/* 2008 * get new policy id. 2009 * OUT: 2010 * 0: failure. 2011 * others: success. 2012 */ 2013static u_int32_t 2014key_getnewspid() 2015{ 2016 u_int32_t newid = 0; 2017 int count = V_key_spi_trycnt; /* XXX */ 2018 struct secpolicy *sp; 2019 2020 /* when requesting to allocate spi ranged */ 2021 while (count--) { 2022 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2023 2024 if ((sp = key_getspbyid(newid)) == NULL) 2025 break; 2026 2027 KEY_FREESP(&sp); 2028 } 2029 2030 if (count == 0 || newid == 0) { 2031 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2032 __func__)); 2033 return 0; 2034 } 2035 2036 return newid; 2037} 2038 2039/* 2040 * SADB_SPDDELETE processing 2041 * receive 2042 * <base, address(SD), policy(*)> 2043 * from the user(?), and set SADB_SASTATE_DEAD, 2044 * and send, 2045 * <base, address(SD), policy(*)> 2046 * to the ikmpd. 2047 * policy(*) including direction of policy. 2048 * 2049 * m will always be freed. 2050 */ 2051static int 2052key_spddelete(so, m, mhp) 2053 struct socket *so; 2054 struct mbuf *m; 2055 const struct sadb_msghdr *mhp; 2056{ 2057 struct sadb_address *src0, *dst0; 2058 struct sadb_x_policy *xpl0; 2059 struct secpolicyindex spidx; 2060 struct secpolicy *sp; 2061 2062 IPSEC_ASSERT(so != NULL, ("null so")); 2063 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2064 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2065 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2066 2067 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2068 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2069 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2070 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2071 __func__)); 2072 return key_senderror(so, m, EINVAL); 2073 } 2074 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2075 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2076 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2077 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2078 __func__)); 2079 return key_senderror(so, m, EINVAL); 2080 } 2081 2082 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2083 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2084 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2085 2086 /* 2087 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2088 * we are processing traffic endpoints. 2089 */ 2090 2091 /* make secindex */ 2092 /* XXX boundary check against sa_len */ 2093 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2094 src0 + 1, 2095 dst0 + 1, 2096 src0->sadb_address_prefixlen, 2097 dst0->sadb_address_prefixlen, 2098 src0->sadb_address_proto, 2099 &spidx); 2100 2101 /* checking the direciton. */ 2102 switch (xpl0->sadb_x_policy_dir) { 2103 case IPSEC_DIR_INBOUND: 2104 case IPSEC_DIR_OUTBOUND: 2105 break; 2106 default: 2107 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2108 return key_senderror(so, m, EINVAL); 2109 } 2110 2111 /* Is there SP in SPD ? */ 2112 if ((sp = key_getsp(&spidx)) == NULL) { 2113 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2114 return key_senderror(so, m, EINVAL); 2115 } 2116 2117 /* save policy id to buffer to be returned. */ 2118 xpl0->sadb_x_policy_id = sp->id; 2119 2120 sp->state = IPSEC_SPSTATE_DEAD; 2121 KEY_FREESP(&sp); 2122 2123 { 2124 struct mbuf *n; 2125 struct sadb_msg *newmsg; 2126 2127 /* 2128 * Note: do not send SADB_X_EXT_NAT_T_* here: 2129 * we are sending traffic endpoints. 2130 */ 2131 2132 /* create new sadb_msg to reply. */ 2133 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2134 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2135 if (!n) 2136 return key_senderror(so, m, ENOBUFS); 2137 2138 newmsg = mtod(n, struct sadb_msg *); 2139 newmsg->sadb_msg_errno = 0; 2140 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2141 2142 m_freem(m); 2143 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2144 } 2145} 2146 2147/* 2148 * SADB_SPDDELETE2 processing 2149 * receive 2150 * <base, policy(*)> 2151 * from the user(?), and set SADB_SASTATE_DEAD, 2152 * and send, 2153 * <base, policy(*)> 2154 * to the ikmpd. 2155 * policy(*) including direction of policy. 2156 * 2157 * m will always be freed. 2158 */ 2159static int 2160key_spddelete2(so, m, mhp) 2161 struct socket *so; 2162 struct mbuf *m; 2163 const struct sadb_msghdr *mhp; 2164{ 2165 u_int32_t id; 2166 struct secpolicy *sp; 2167 2168 IPSEC_ASSERT(so != NULL, ("null socket")); 2169 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2170 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2171 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2172 2173 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2174 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2175 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2176 return key_senderror(so, m, EINVAL); 2177 } 2178 2179 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2180 2181 /* Is there SP in SPD ? */ 2182 if ((sp = key_getspbyid(id)) == NULL) { 2183 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2184 return key_senderror(so, m, EINVAL); 2185 } 2186 2187 sp->state = IPSEC_SPSTATE_DEAD; 2188 KEY_FREESP(&sp); 2189 2190 { 2191 struct mbuf *n, *nn; 2192 struct sadb_msg *newmsg; 2193 int off, len; 2194 2195 /* create new sadb_msg to reply. */ 2196 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2197 2198 MGETHDR(n, M_DONTWAIT, MT_DATA); 2199 if (n && len > MHLEN) { 2200 MCLGET(n, M_DONTWAIT); 2201 if ((n->m_flags & M_EXT) == 0) { 2202 m_freem(n); 2203 n = NULL; 2204 } 2205 } 2206 if (!n) 2207 return key_senderror(so, m, ENOBUFS); 2208 2209 n->m_len = len; 2210 n->m_next = NULL; 2211 off = 0; 2212 2213 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2214 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2215 2216 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2217 off, len)); 2218 2219 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2220 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2221 if (!n->m_next) { 2222 m_freem(n); 2223 return key_senderror(so, m, ENOBUFS); 2224 } 2225 2226 n->m_pkthdr.len = 0; 2227 for (nn = n; nn; nn = nn->m_next) 2228 n->m_pkthdr.len += nn->m_len; 2229 2230 newmsg = mtod(n, struct sadb_msg *); 2231 newmsg->sadb_msg_errno = 0; 2232 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2233 2234 m_freem(m); 2235 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2236 } 2237} 2238 2239/* 2240 * SADB_X_GET processing 2241 * receive 2242 * <base, policy(*)> 2243 * from the user(?), 2244 * and send, 2245 * <base, address(SD), policy> 2246 * to the ikmpd. 2247 * policy(*) including direction of policy. 2248 * 2249 * m will always be freed. 2250 */ 2251static int 2252key_spdget(so, m, mhp) 2253 struct socket *so; 2254 struct mbuf *m; 2255 const struct sadb_msghdr *mhp; 2256{ 2257 u_int32_t id; 2258 struct secpolicy *sp; 2259 struct mbuf *n; 2260 2261 IPSEC_ASSERT(so != NULL, ("null socket")); 2262 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2263 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2264 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2265 2266 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2267 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2268 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2269 __func__)); 2270 return key_senderror(so, m, EINVAL); 2271 } 2272 2273 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2274 2275 /* Is there SP in SPD ? */ 2276 if ((sp = key_getspbyid(id)) == NULL) { 2277 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2278 return key_senderror(so, m, ENOENT); 2279 } 2280 2281 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2282 if (n != NULL) { 2283 m_freem(m); 2284 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2285 } else 2286 return key_senderror(so, m, ENOBUFS); 2287} 2288 2289/* 2290 * SADB_X_SPDACQUIRE processing. 2291 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2292 * send 2293 * <base, policy(*)> 2294 * to KMD, and expect to receive 2295 * <base> with SADB_X_SPDACQUIRE if error occured, 2296 * or 2297 * <base, policy> 2298 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2299 * policy(*) is without policy requests. 2300 * 2301 * 0 : succeed 2302 * others: error number 2303 */ 2304int 2305key_spdacquire(sp) 2306 struct secpolicy *sp; 2307{ 2308 struct mbuf *result = NULL, *m; 2309 struct secspacq *newspacq; 2310 2311 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2312 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2313 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2314 ("policy not IPSEC %u", sp->policy)); 2315 2316 /* Get an entry to check whether sent message or not. */ 2317 newspacq = key_getspacq(&sp->spidx); 2318 if (newspacq != NULL) { 2319 if (V_key_blockacq_count < newspacq->count) { 2320 /* reset counter and do send message. */ 2321 newspacq->count = 0; 2322 } else { 2323 /* increment counter and do nothing. */ 2324 newspacq->count++; 2325 return 0; 2326 } 2327 SPACQ_UNLOCK(); 2328 } else { 2329 /* make new entry for blocking to send SADB_ACQUIRE. */ 2330 newspacq = key_newspacq(&sp->spidx); 2331 if (newspacq == NULL) 2332 return ENOBUFS; 2333 } 2334 2335 /* create new sadb_msg to reply. */ 2336 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2337 if (!m) 2338 return ENOBUFS; 2339 2340 result = m; 2341 2342 result->m_pkthdr.len = 0; 2343 for (m = result; m; m = m->m_next) 2344 result->m_pkthdr.len += m->m_len; 2345 2346 mtod(result, struct sadb_msg *)->sadb_msg_len = 2347 PFKEY_UNIT64(result->m_pkthdr.len); 2348 2349 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2350} 2351 2352/* 2353 * SADB_SPDFLUSH processing 2354 * receive 2355 * <base> 2356 * from the user, and free all entries in secpctree. 2357 * and send, 2358 * <base> 2359 * to the user. 2360 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2361 * 2362 * m will always be freed. 2363 */ 2364static int 2365key_spdflush(so, m, mhp) 2366 struct socket *so; 2367 struct mbuf *m; 2368 const struct sadb_msghdr *mhp; 2369{ 2370 struct sadb_msg *newmsg; 2371 struct secpolicy *sp; 2372 u_int dir; 2373 2374 IPSEC_ASSERT(so != NULL, ("null socket")); 2375 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2376 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2377 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2378 2379 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2380 return key_senderror(so, m, EINVAL); 2381 2382 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2383 SPTREE_LOCK(); 2384 LIST_FOREACH(sp, &V_sptree[dir], chain) 2385 sp->state = IPSEC_SPSTATE_DEAD; 2386 SPTREE_UNLOCK(); 2387 } 2388 2389 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2390 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2391 return key_senderror(so, m, ENOBUFS); 2392 } 2393 2394 if (m->m_next) 2395 m_freem(m->m_next); 2396 m->m_next = NULL; 2397 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2398 newmsg = mtod(m, struct sadb_msg *); 2399 newmsg->sadb_msg_errno = 0; 2400 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2401 2402 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2403} 2404 2405/* 2406 * SADB_SPDDUMP processing 2407 * receive 2408 * <base> 2409 * from the user, and dump all SP leaves 2410 * and send, 2411 * <base> ..... 2412 * to the ikmpd. 2413 * 2414 * m will always be freed. 2415 */ 2416static int 2417key_spddump(so, m, mhp) 2418 struct socket *so; 2419 struct mbuf *m; 2420 const struct sadb_msghdr *mhp; 2421{ 2422 struct secpolicy *sp; 2423 int cnt; 2424 u_int dir; 2425 struct mbuf *n; 2426 2427 IPSEC_ASSERT(so != NULL, ("null socket")); 2428 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2429 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2430 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2431 2432 /* search SPD entry and get buffer size. */ 2433 cnt = 0; 2434 SPTREE_LOCK(); 2435 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2436 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2437 cnt++; 2438 } 2439 } 2440 2441 if (cnt == 0) { 2442 SPTREE_UNLOCK(); 2443 return key_senderror(so, m, ENOENT); 2444 } 2445 2446 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2447 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2448 --cnt; 2449 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2450 mhp->msg->sadb_msg_pid); 2451 2452 if (n) 2453 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2454 } 2455 } 2456 2457 SPTREE_UNLOCK(); 2458 m_freem(m); 2459 return 0; 2460} 2461 2462static struct mbuf * 2463key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2464{ 2465 struct mbuf *result = NULL, *m; 2466 struct seclifetime lt; 2467 2468 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2469 if (!m) 2470 goto fail; 2471 result = m; 2472 2473 /* 2474 * Note: do not send SADB_X_EXT_NAT_T_* here: 2475 * we are sending traffic endpoints. 2476 */ 2477 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2478 &sp->spidx.src.sa, sp->spidx.prefs, 2479 sp->spidx.ul_proto); 2480 if (!m) 2481 goto fail; 2482 m_cat(result, m); 2483 2484 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2485 &sp->spidx.dst.sa, sp->spidx.prefd, 2486 sp->spidx.ul_proto); 2487 if (!m) 2488 goto fail; 2489 m_cat(result, m); 2490 2491 m = key_sp2msg(sp); 2492 if (!m) 2493 goto fail; 2494 m_cat(result, m); 2495 2496 if(sp->lifetime){ 2497 lt.addtime=sp->created; 2498 lt.usetime= sp->lastused; 2499 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2500 if (!m) 2501 goto fail; 2502 m_cat(result, m); 2503 2504 lt.addtime=sp->lifetime; 2505 lt.usetime= sp->validtime; 2506 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2507 if (!m) 2508 goto fail; 2509 m_cat(result, m); 2510 } 2511 2512 if ((result->m_flags & M_PKTHDR) == 0) 2513 goto fail; 2514 2515 if (result->m_len < sizeof(struct sadb_msg)) { 2516 result = m_pullup(result, sizeof(struct sadb_msg)); 2517 if (result == NULL) 2518 goto fail; 2519 } 2520 2521 result->m_pkthdr.len = 0; 2522 for (m = result; m; m = m->m_next) 2523 result->m_pkthdr.len += m->m_len; 2524 2525 mtod(result, struct sadb_msg *)->sadb_msg_len = 2526 PFKEY_UNIT64(result->m_pkthdr.len); 2527 2528 return result; 2529 2530fail: 2531 m_freem(result); 2532 return NULL; 2533} 2534 2535/* 2536 * get PFKEY message length for security policy and request. 2537 */ 2538static u_int 2539key_getspreqmsglen(sp) 2540 struct secpolicy *sp; 2541{ 2542 u_int tlen; 2543 2544 tlen = sizeof(struct sadb_x_policy); 2545 2546 /* if is the policy for ipsec ? */ 2547 if (sp->policy != IPSEC_POLICY_IPSEC) 2548 return tlen; 2549 2550 /* get length of ipsec requests */ 2551 { 2552 struct ipsecrequest *isr; 2553 int len; 2554 2555 for (isr = sp->req; isr != NULL; isr = isr->next) { 2556 len = sizeof(struct sadb_x_ipsecrequest) 2557 + isr->saidx.src.sa.sa_len 2558 + isr->saidx.dst.sa.sa_len; 2559 2560 tlen += PFKEY_ALIGN8(len); 2561 } 2562 } 2563 2564 return tlen; 2565} 2566 2567/* 2568 * SADB_SPDEXPIRE processing 2569 * send 2570 * <base, address(SD), lifetime(CH), policy> 2571 * to KMD by PF_KEY. 2572 * 2573 * OUT: 0 : succeed 2574 * others : error number 2575 */ 2576static int 2577key_spdexpire(sp) 2578 struct secpolicy *sp; 2579{ 2580 struct mbuf *result = NULL, *m; 2581 int len; 2582 int error = -1; 2583 struct sadb_lifetime *lt; 2584 2585 /* XXX: Why do we lock ? */ 2586 2587 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2588 2589 /* set msg header */ 2590 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2591 if (!m) { 2592 error = ENOBUFS; 2593 goto fail; 2594 } 2595 result = m; 2596 2597 /* create lifetime extension (current and hard) */ 2598 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2599 m = key_alloc_mbuf(len); 2600 if (!m || m->m_next) { /*XXX*/ 2601 if (m) 2602 m_freem(m); 2603 error = ENOBUFS; 2604 goto fail; 2605 } 2606 bzero(mtod(m, caddr_t), len); 2607 lt = mtod(m, struct sadb_lifetime *); 2608 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2609 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2610 lt->sadb_lifetime_allocations = 0; 2611 lt->sadb_lifetime_bytes = 0; 2612 lt->sadb_lifetime_addtime = sp->created; 2613 lt->sadb_lifetime_usetime = sp->lastused; 2614 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2615 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2616 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2617 lt->sadb_lifetime_allocations = 0; 2618 lt->sadb_lifetime_bytes = 0; 2619 lt->sadb_lifetime_addtime = sp->lifetime; 2620 lt->sadb_lifetime_usetime = sp->validtime; 2621 m_cat(result, m); 2622 2623 /* 2624 * Note: do not send SADB_X_EXT_NAT_T_* here: 2625 * we are sending traffic endpoints. 2626 */ 2627 2628 /* set sadb_address for source */ 2629 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2630 &sp->spidx.src.sa, 2631 sp->spidx.prefs, sp->spidx.ul_proto); 2632 if (!m) { 2633 error = ENOBUFS; 2634 goto fail; 2635 } 2636 m_cat(result, m); 2637 2638 /* set sadb_address for destination */ 2639 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2640 &sp->spidx.dst.sa, 2641 sp->spidx.prefd, sp->spidx.ul_proto); 2642 if (!m) { 2643 error = ENOBUFS; 2644 goto fail; 2645 } 2646 m_cat(result, m); 2647 2648 /* set secpolicy */ 2649 m = key_sp2msg(sp); 2650 if (!m) { 2651 error = ENOBUFS; 2652 goto fail; 2653 } 2654 m_cat(result, m); 2655 2656 if ((result->m_flags & M_PKTHDR) == 0) { 2657 error = EINVAL; 2658 goto fail; 2659 } 2660 2661 if (result->m_len < sizeof(struct sadb_msg)) { 2662 result = m_pullup(result, sizeof(struct sadb_msg)); 2663 if (result == NULL) { 2664 error = ENOBUFS; 2665 goto fail; 2666 } 2667 } 2668 2669 result->m_pkthdr.len = 0; 2670 for (m = result; m; m = m->m_next) 2671 result->m_pkthdr.len += m->m_len; 2672 2673 mtod(result, struct sadb_msg *)->sadb_msg_len = 2674 PFKEY_UNIT64(result->m_pkthdr.len); 2675 2676 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2677 2678 fail: 2679 if (result) 2680 m_freem(result); 2681 return error; 2682} 2683 2684/* %%% SAD management */ 2685/* 2686 * allocating a memory for new SA head, and copy from the values of mhp. 2687 * OUT: NULL : failure due to the lack of memory. 2688 * others : pointer to new SA head. 2689 */ 2690static struct secashead * 2691key_newsah(saidx) 2692 struct secasindex *saidx; 2693{ 2694 struct secashead *newsah; 2695 2696 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2697 2698 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2699 if (newsah != NULL) { 2700 int i; 2701 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2702 LIST_INIT(&newsah->savtree[i]); 2703 newsah->saidx = *saidx; 2704 2705 /* add to saidxtree */ 2706 newsah->state = SADB_SASTATE_MATURE; 2707 2708 SAHTREE_LOCK(); 2709 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2710 SAHTREE_UNLOCK(); 2711 } 2712 return(newsah); 2713} 2714 2715/* 2716 * delete SA index and all SA registerd. 2717 */ 2718static void 2719key_delsah(sah) 2720 struct secashead *sah; 2721{ 2722 struct secasvar *sav, *nextsav; 2723 u_int stateidx; 2724 int zombie = 0; 2725 2726 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2727 SAHTREE_LOCK_ASSERT(); 2728 2729 /* searching all SA registerd in the secindex. */ 2730 for (stateidx = 0; 2731 stateidx < _ARRAYLEN(saorder_state_any); 2732 stateidx++) { 2733 u_int state = saorder_state_any[stateidx]; 2734 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2735 if (sav->refcnt == 0) { 2736 /* sanity check */ 2737 KEY_CHKSASTATE(state, sav->state, __func__); 2738 /* 2739 * do NOT call KEY_FREESAV here: 2740 * it will only delete the sav if refcnt == 1, 2741 * where we already know that refcnt == 0 2742 */ 2743 key_delsav(sav); 2744 } else { 2745 /* give up to delete this sa */ 2746 zombie++; 2747 } 2748 } 2749 } 2750 if (!zombie) { /* delete only if there are savs */ 2751 /* remove from tree of SA index */ 2752 if (__LIST_CHAINED(sah)) 2753 LIST_REMOVE(sah, chain); 2754 if (sah->sa_route.ro_rt) { 2755 RTFREE(sah->sa_route.ro_rt); 2756 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2757 } 2758 free(sah, M_IPSEC_SAH); 2759 } 2760} 2761 2762/* 2763 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2764 * and copy the values of mhp into new buffer. 2765 * When SAD message type is GETSPI: 2766 * to set sequence number from acq_seq++, 2767 * to set zero to SPI. 2768 * not to call key_setsava(). 2769 * OUT: NULL : fail 2770 * others : pointer to new secasvar. 2771 * 2772 * does not modify mbuf. does not free mbuf on error. 2773 */ 2774static struct secasvar * 2775key_newsav(m, mhp, sah, errp, where, tag) 2776 struct mbuf *m; 2777 const struct sadb_msghdr *mhp; 2778 struct secashead *sah; 2779 int *errp; 2780 const char* where; 2781 int tag; 2782{ 2783 struct secasvar *newsav; 2784 const struct sadb_sa *xsa; 2785 2786 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2787 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2788 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2789 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2790 2791 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2792 if (newsav == NULL) { 2793 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2794 *errp = ENOBUFS; 2795 goto done; 2796 } 2797 2798 switch (mhp->msg->sadb_msg_type) { 2799 case SADB_GETSPI: 2800 newsav->spi = 0; 2801 2802#ifdef IPSEC_DOSEQCHECK 2803 /* sync sequence number */ 2804 if (mhp->msg->sadb_msg_seq == 0) 2805 newsav->seq = 2806 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2807 else 2808#endif 2809 newsav->seq = mhp->msg->sadb_msg_seq; 2810 break; 2811 2812 case SADB_ADD: 2813 /* sanity check */ 2814 if (mhp->ext[SADB_EXT_SA] == NULL) { 2815 free(newsav, M_IPSEC_SA); 2816 newsav = NULL; 2817 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2818 __func__)); 2819 *errp = EINVAL; 2820 goto done; 2821 } 2822 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2823 newsav->spi = xsa->sadb_sa_spi; 2824 newsav->seq = mhp->msg->sadb_msg_seq; 2825 break; 2826 default: 2827 free(newsav, M_IPSEC_SA); 2828 newsav = NULL; 2829 *errp = EINVAL; 2830 goto done; 2831 } 2832 2833 2834 /* copy sav values */ 2835 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2836 *errp = key_setsaval(newsav, m, mhp); 2837 if (*errp) { 2838 free(newsav, M_IPSEC_SA); 2839 newsav = NULL; 2840 goto done; 2841 } 2842 } 2843 2844 SECASVAR_LOCK_INIT(newsav); 2845 2846 /* reset created */ 2847 newsav->created = time_second; 2848 newsav->pid = mhp->msg->sadb_msg_pid; 2849 2850 /* add to satree */ 2851 newsav->sah = sah; 2852 sa_initref(newsav); 2853 newsav->state = SADB_SASTATE_LARVAL; 2854 2855 /* XXX locking??? */ 2856 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2857 secasvar, chain); 2858done: 2859 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2860 printf("DP %s from %s:%u return SP:%p\n", __func__, 2861 where, tag, newsav)); 2862 2863 return newsav; 2864} 2865 2866/* 2867 * free() SA variable entry. 2868 */ 2869static void 2870key_cleansav(struct secasvar *sav) 2871{ 2872 /* 2873 * Cleanup xform state. Note that zeroize'ing causes the 2874 * keys to be cleared; otherwise we must do it ourself. 2875 */ 2876 if (sav->tdb_xform != NULL) { 2877 sav->tdb_xform->xf_zeroize(sav); 2878 sav->tdb_xform = NULL; 2879 } else { 2880 KASSERT(sav->iv == NULL, ("iv but no xform")); 2881 if (sav->key_auth != NULL) 2882 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2883 if (sav->key_enc != NULL) 2884 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2885 } 2886 if (sav->key_auth != NULL) { 2887 if (sav->key_auth->key_data != NULL) 2888 free(sav->key_auth->key_data, M_IPSEC_MISC); 2889 free(sav->key_auth, M_IPSEC_MISC); 2890 sav->key_auth = NULL; 2891 } 2892 if (sav->key_enc != NULL) { 2893 if (sav->key_enc->key_data != NULL) 2894 free(sav->key_enc->key_data, M_IPSEC_MISC); 2895 free(sav->key_enc, M_IPSEC_MISC); 2896 sav->key_enc = NULL; 2897 } 2898 if (sav->sched) { 2899 bzero(sav->sched, sav->schedlen); 2900 free(sav->sched, M_IPSEC_MISC); 2901 sav->sched = NULL; 2902 } 2903 if (sav->replay != NULL) { 2904 free(sav->replay, M_IPSEC_MISC); 2905 sav->replay = NULL; 2906 } 2907 if (sav->lft_c != NULL) { 2908 free(sav->lft_c, M_IPSEC_MISC); 2909 sav->lft_c = NULL; 2910 } 2911 if (sav->lft_h != NULL) { 2912 free(sav->lft_h, M_IPSEC_MISC); 2913 sav->lft_h = NULL; 2914 } 2915 if (sav->lft_s != NULL) { 2916 free(sav->lft_s, M_IPSEC_MISC); 2917 sav->lft_s = NULL; 2918 } 2919} 2920 2921/* 2922 * free() SA variable entry. 2923 */ 2924static void 2925key_delsav(sav) 2926 struct secasvar *sav; 2927{ 2928 IPSEC_ASSERT(sav != NULL, ("null sav")); 2929 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2930 2931 /* remove from SA header */ 2932 if (__LIST_CHAINED(sav)) 2933 LIST_REMOVE(sav, chain); 2934 key_cleansav(sav); 2935 SECASVAR_LOCK_DESTROY(sav); 2936 free(sav, M_IPSEC_SA); 2937} 2938 2939/* 2940 * search SAD. 2941 * OUT: 2942 * NULL : not found 2943 * others : found, pointer to a SA. 2944 */ 2945static struct secashead * 2946key_getsah(saidx) 2947 struct secasindex *saidx; 2948{ 2949 struct secashead *sah; 2950 2951 SAHTREE_LOCK(); 2952 LIST_FOREACH(sah, &V_sahtree, chain) { 2953 if (sah->state == SADB_SASTATE_DEAD) 2954 continue; 2955 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2956 break; 2957 } 2958 SAHTREE_UNLOCK(); 2959 2960 return sah; 2961} 2962 2963/* 2964 * check not to be duplicated SPI. 2965 * NOTE: this function is too slow due to searching all SAD. 2966 * OUT: 2967 * NULL : not found 2968 * others : found, pointer to a SA. 2969 */ 2970static struct secasvar * 2971key_checkspidup(saidx, spi) 2972 struct secasindex *saidx; 2973 u_int32_t spi; 2974{ 2975 struct secashead *sah; 2976 struct secasvar *sav; 2977 2978 /* check address family */ 2979 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2980 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2981 __func__)); 2982 return NULL; 2983 } 2984 2985 sav = NULL; 2986 /* check all SAD */ 2987 SAHTREE_LOCK(); 2988 LIST_FOREACH(sah, &V_sahtree, chain) { 2989 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2990 continue; 2991 sav = key_getsavbyspi(sah, spi); 2992 if (sav != NULL) 2993 break; 2994 } 2995 SAHTREE_UNLOCK(); 2996 2997 return sav; 2998} 2999 3000/* 3001 * search SAD litmited alive SA, protocol, SPI. 3002 * OUT: 3003 * NULL : not found 3004 * others : found, pointer to a SA. 3005 */ 3006static struct secasvar * 3007key_getsavbyspi(sah, spi) 3008 struct secashead *sah; 3009 u_int32_t spi; 3010{ 3011 struct secasvar *sav; 3012 u_int stateidx, state; 3013 3014 sav = NULL; 3015 SAHTREE_LOCK_ASSERT(); 3016 /* search all status */ 3017 for (stateidx = 0; 3018 stateidx < _ARRAYLEN(saorder_state_alive); 3019 stateidx++) { 3020 3021 state = saorder_state_alive[stateidx]; 3022 LIST_FOREACH(sav, &sah->savtree[state], chain) { 3023 3024 /* sanity check */ 3025 if (sav->state != state) { 3026 ipseclog((LOG_DEBUG, "%s: " 3027 "invalid sav->state (queue: %d SA: %d)\n", 3028 __func__, state, sav->state)); 3029 continue; 3030 } 3031 3032 if (sav->spi == spi) 3033 return sav; 3034 } 3035 } 3036 3037 return NULL; 3038} 3039 3040/* 3041 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3042 * You must update these if need. 3043 * OUT: 0: success. 3044 * !0: failure. 3045 * 3046 * does not modify mbuf. does not free mbuf on error. 3047 */ 3048static int 3049key_setsaval(sav, m, mhp) 3050 struct secasvar *sav; 3051 struct mbuf *m; 3052 const struct sadb_msghdr *mhp; 3053{ 3054 int error = 0; 3055 3056 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3057 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3058 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3059 3060 /* initialization */ 3061 sav->replay = NULL; 3062 sav->key_auth = NULL; 3063 sav->key_enc = NULL; 3064 sav->sched = NULL; 3065 sav->schedlen = 0; 3066 sav->iv = NULL; 3067 sav->lft_c = NULL; 3068 sav->lft_h = NULL; 3069 sav->lft_s = NULL; 3070 sav->tdb_xform = NULL; /* transform */ 3071 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3072 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3073 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3074 /* Initialize even if NAT-T not compiled in: */ 3075 sav->natt_type = 0; 3076 sav->natt_esp_frag_len = 0; 3077 3078 /* SA */ 3079 if (mhp->ext[SADB_EXT_SA] != NULL) { 3080 const struct sadb_sa *sa0; 3081 3082 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3083 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3084 error = EINVAL; 3085 goto fail; 3086 } 3087 3088 sav->alg_auth = sa0->sadb_sa_auth; 3089 sav->alg_enc = sa0->sadb_sa_encrypt; 3090 sav->flags = sa0->sadb_sa_flags; 3091 3092 /* replay window */ 3093 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3094 sav->replay = (struct secreplay *) 3095 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3096 if (sav->replay == NULL) { 3097 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3098 __func__)); 3099 error = ENOBUFS; 3100 goto fail; 3101 } 3102 if (sa0->sadb_sa_replay != 0) 3103 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3104 sav->replay->wsize = sa0->sadb_sa_replay; 3105 } 3106 } 3107 3108 /* Authentication keys */ 3109 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3110 const struct sadb_key *key0; 3111 int len; 3112 3113 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3114 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3115 3116 error = 0; 3117 if (len < sizeof(*key0)) { 3118 error = EINVAL; 3119 goto fail; 3120 } 3121 switch (mhp->msg->sadb_msg_satype) { 3122 case SADB_SATYPE_AH: 3123 case SADB_SATYPE_ESP: 3124 case SADB_X_SATYPE_TCPSIGNATURE: 3125 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3126 sav->alg_auth != SADB_X_AALG_NULL) 3127 error = EINVAL; 3128 break; 3129 case SADB_X_SATYPE_IPCOMP: 3130 default: 3131 error = EINVAL; 3132 break; 3133 } 3134 if (error) { 3135 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3136 __func__)); 3137 goto fail; 3138 } 3139 3140 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3141 M_IPSEC_MISC); 3142 if (sav->key_auth == NULL ) { 3143 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3144 __func__)); 3145 error = ENOBUFS; 3146 goto fail; 3147 } 3148 } 3149 3150 /* Encryption key */ 3151 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3152 const struct sadb_key *key0; 3153 int len; 3154 3155 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3156 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3157 3158 error = 0; 3159 if (len < sizeof(*key0)) { 3160 error = EINVAL; 3161 goto fail; 3162 } 3163 switch (mhp->msg->sadb_msg_satype) { 3164 case SADB_SATYPE_ESP: 3165 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3166 sav->alg_enc != SADB_EALG_NULL) { 3167 error = EINVAL; 3168 break; 3169 } 3170 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3171 len, 3172 M_IPSEC_MISC); 3173 if (sav->key_enc == NULL) { 3174 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3175 __func__)); 3176 error = ENOBUFS; 3177 goto fail; 3178 } 3179 break; 3180 case SADB_X_SATYPE_IPCOMP: 3181 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3182 error = EINVAL; 3183 sav->key_enc = NULL; /*just in case*/ 3184 break; 3185 case SADB_SATYPE_AH: 3186 case SADB_X_SATYPE_TCPSIGNATURE: 3187 default: 3188 error = EINVAL; 3189 break; 3190 } 3191 if (error) { 3192 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3193 __func__)); 3194 goto fail; 3195 } 3196 } 3197 3198 /* set iv */ 3199 sav->ivlen = 0; 3200 3201 switch (mhp->msg->sadb_msg_satype) { 3202 case SADB_SATYPE_AH: 3203 error = xform_init(sav, XF_AH); 3204 break; 3205 case SADB_SATYPE_ESP: 3206 error = xform_init(sav, XF_ESP); 3207 break; 3208 case SADB_X_SATYPE_IPCOMP: 3209 error = xform_init(sav, XF_IPCOMP); 3210 break; 3211 case SADB_X_SATYPE_TCPSIGNATURE: 3212 error = xform_init(sav, XF_TCPSIGNATURE); 3213 break; 3214 } 3215 if (error) { 3216 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3217 __func__, mhp->msg->sadb_msg_satype)); 3218 goto fail; 3219 } 3220 3221 /* reset created */ 3222 sav->created = time_second; 3223 3224 /* make lifetime for CURRENT */ 3225 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3226 if (sav->lft_c == NULL) { 3227 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3228 error = ENOBUFS; 3229 goto fail; 3230 } 3231 3232 sav->lft_c->allocations = 0; 3233 sav->lft_c->bytes = 0; 3234 sav->lft_c->addtime = time_second; 3235 sav->lft_c->usetime = 0; 3236 3237 /* lifetimes for HARD and SOFT */ 3238 { 3239 const struct sadb_lifetime *lft0; 3240 3241 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3242 if (lft0 != NULL) { 3243 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3244 error = EINVAL; 3245 goto fail; 3246 } 3247 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3248 if (sav->lft_h == NULL) { 3249 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3250 error = ENOBUFS; 3251 goto fail; 3252 } 3253 /* to be initialize ? */ 3254 } 3255 3256 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3257 if (lft0 != NULL) { 3258 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3259 error = EINVAL; 3260 goto fail; 3261 } 3262 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3263 if (sav->lft_s == NULL) { 3264 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3265 error = ENOBUFS; 3266 goto fail; 3267 } 3268 /* to be initialize ? */ 3269 } 3270 } 3271 3272 return 0; 3273 3274 fail: 3275 /* initialization */ 3276 key_cleansav(sav); 3277 3278 return error; 3279} 3280 3281/* 3282 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3283 * OUT: 0: valid 3284 * other: errno 3285 */ 3286static int 3287key_mature(struct secasvar *sav) 3288{ 3289 int error; 3290 3291 /* check SPI value */ 3292 switch (sav->sah->saidx.proto) { 3293 case IPPROTO_ESP: 3294 case IPPROTO_AH: 3295 /* 3296 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3297 * 1-255 reserved by IANA for future use, 3298 * 0 for implementation specific, local use. 3299 */ 3300 if (ntohl(sav->spi) <= 255) { 3301 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3302 __func__, (u_int32_t)ntohl(sav->spi))); 3303 return EINVAL; 3304 } 3305 break; 3306 } 3307 3308 /* check satype */ 3309 switch (sav->sah->saidx.proto) { 3310 case IPPROTO_ESP: 3311 /* check flags */ 3312 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3313 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3314 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3315 "given to old-esp.\n", __func__)); 3316 return EINVAL; 3317 } 3318 error = xform_init(sav, XF_ESP); 3319 break; 3320 case IPPROTO_AH: 3321 /* check flags */ 3322 if (sav->flags & SADB_X_EXT_DERIV) { 3323 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3324 "given to AH SA.\n", __func__)); 3325 return EINVAL; 3326 } 3327 if (sav->alg_enc != SADB_EALG_NONE) { 3328 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3329 "mismated.\n", __func__)); 3330 return(EINVAL); 3331 } 3332 error = xform_init(sav, XF_AH); 3333 break; 3334 case IPPROTO_IPCOMP: 3335 if (sav->alg_auth != SADB_AALG_NONE) { 3336 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3337 "mismated.\n", __func__)); 3338 return(EINVAL); 3339 } 3340 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3341 && ntohl(sav->spi) >= 0x10000) { 3342 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3343 __func__)); 3344 return(EINVAL); 3345 } 3346 error = xform_init(sav, XF_IPCOMP); 3347 break; 3348 case IPPROTO_TCP: 3349 if (sav->alg_enc != SADB_EALG_NONE) { 3350 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3351 "mismated.\n", __func__)); 3352 return(EINVAL); 3353 } 3354 error = xform_init(sav, XF_TCPSIGNATURE); 3355 break; 3356 default: 3357 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3358 error = EPROTONOSUPPORT; 3359 break; 3360 } 3361 if (error == 0) { 3362 SAHTREE_LOCK(); 3363 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3364 SAHTREE_UNLOCK(); 3365 } 3366 return (error); 3367} 3368 3369/* 3370 * subroutine for SADB_GET and SADB_DUMP. 3371 */ 3372static struct mbuf * 3373key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3374 u_int32_t seq, u_int32_t pid) 3375{ 3376 struct mbuf *result = NULL, *tres = NULL, *m; 3377 int i; 3378 int dumporder[] = { 3379 SADB_EXT_SA, SADB_X_EXT_SA2, 3380 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3381 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3382 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3383 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3384 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3385#ifdef IPSEC_NAT_T 3386 SADB_X_EXT_NAT_T_TYPE, 3387 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3388 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3389 SADB_X_EXT_NAT_T_FRAG, 3390#endif 3391 }; 3392 3393 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3394 if (m == NULL) 3395 goto fail; 3396 result = m; 3397 3398 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3399 m = NULL; 3400 switch (dumporder[i]) { 3401 case SADB_EXT_SA: 3402 m = key_setsadbsa(sav); 3403 if (!m) 3404 goto fail; 3405 break; 3406 3407 case SADB_X_EXT_SA2: 3408 m = key_setsadbxsa2(sav->sah->saidx.mode, 3409 sav->replay ? sav->replay->count : 0, 3410 sav->sah->saidx.reqid); 3411 if (!m) 3412 goto fail; 3413 break; 3414 3415 case SADB_EXT_ADDRESS_SRC: 3416 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3417 &sav->sah->saidx.src.sa, 3418 FULLMASK, IPSEC_ULPROTO_ANY); 3419 if (!m) 3420 goto fail; 3421 break; 3422 3423 case SADB_EXT_ADDRESS_DST: 3424 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3425 &sav->sah->saidx.dst.sa, 3426 FULLMASK, IPSEC_ULPROTO_ANY); 3427 if (!m) 3428 goto fail; 3429 break; 3430 3431 case SADB_EXT_KEY_AUTH: 3432 if (!sav->key_auth) 3433 continue; 3434 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3435 if (!m) 3436 goto fail; 3437 break; 3438 3439 case SADB_EXT_KEY_ENCRYPT: 3440 if (!sav->key_enc) 3441 continue; 3442 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3443 if (!m) 3444 goto fail; 3445 break; 3446 3447 case SADB_EXT_LIFETIME_CURRENT: 3448 if (!sav->lft_c) 3449 continue; 3450 m = key_setlifetime(sav->lft_c, 3451 SADB_EXT_LIFETIME_CURRENT); 3452 if (!m) 3453 goto fail; 3454 break; 3455 3456 case SADB_EXT_LIFETIME_HARD: 3457 if (!sav->lft_h) 3458 continue; 3459 m = key_setlifetime(sav->lft_h, 3460 SADB_EXT_LIFETIME_HARD); 3461 if (!m) 3462 goto fail; 3463 break; 3464 3465 case SADB_EXT_LIFETIME_SOFT: 3466 if (!sav->lft_s) 3467 continue; 3468 m = key_setlifetime(sav->lft_s, 3469 SADB_EXT_LIFETIME_SOFT); 3470 3471 if (!m) 3472 goto fail; 3473 break; 3474 3475#ifdef IPSEC_NAT_T 3476 case SADB_X_EXT_NAT_T_TYPE: 3477 m = key_setsadbxtype(sav->natt_type); 3478 if (!m) 3479 goto fail; 3480 break; 3481 3482 case SADB_X_EXT_NAT_T_DPORT: 3483 m = key_setsadbxport( 3484 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3485 SADB_X_EXT_NAT_T_DPORT); 3486 if (!m) 3487 goto fail; 3488 break; 3489 3490 case SADB_X_EXT_NAT_T_SPORT: 3491 m = key_setsadbxport( 3492 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3493 SADB_X_EXT_NAT_T_SPORT); 3494 if (!m) 3495 goto fail; 3496 break; 3497 3498 case SADB_X_EXT_NAT_T_OAI: 3499 case SADB_X_EXT_NAT_T_OAR: 3500 case SADB_X_EXT_NAT_T_FRAG: 3501 /* We do not (yet) support those. */ 3502 continue; 3503#endif 3504 3505 case SADB_EXT_ADDRESS_PROXY: 3506 case SADB_EXT_IDENTITY_SRC: 3507 case SADB_EXT_IDENTITY_DST: 3508 /* XXX: should we brought from SPD ? */ 3509 case SADB_EXT_SENSITIVITY: 3510 default: 3511 continue; 3512 } 3513 3514 if (!m) 3515 goto fail; 3516 if (tres) 3517 m_cat(m, tres); 3518 tres = m; 3519 3520 } 3521 3522 m_cat(result, tres); 3523 if (result->m_len < sizeof(struct sadb_msg)) { 3524 result = m_pullup(result, sizeof(struct sadb_msg)); 3525 if (result == NULL) 3526 goto fail; 3527 } 3528 3529 result->m_pkthdr.len = 0; 3530 for (m = result; m; m = m->m_next) 3531 result->m_pkthdr.len += m->m_len; 3532 3533 mtod(result, struct sadb_msg *)->sadb_msg_len = 3534 PFKEY_UNIT64(result->m_pkthdr.len); 3535 3536 return result; 3537 3538fail: 3539 m_freem(result); 3540 m_freem(tres); 3541 return NULL; 3542} 3543 3544/* 3545 * set data into sadb_msg. 3546 */ 3547static struct mbuf * 3548key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3549 pid_t pid, u_int16_t reserved) 3550{ 3551 struct mbuf *m; 3552 struct sadb_msg *p; 3553 int len; 3554 3555 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3556 if (len > MCLBYTES) 3557 return NULL; 3558 MGETHDR(m, M_DONTWAIT, MT_DATA); 3559 if (m && len > MHLEN) { 3560 MCLGET(m, M_DONTWAIT); 3561 if ((m->m_flags & M_EXT) == 0) { 3562 m_freem(m); 3563 m = NULL; 3564 } 3565 } 3566 if (!m) 3567 return NULL; 3568 m->m_pkthdr.len = m->m_len = len; 3569 m->m_next = NULL; 3570 3571 p = mtod(m, struct sadb_msg *); 3572 3573 bzero(p, len); 3574 p->sadb_msg_version = PF_KEY_V2; 3575 p->sadb_msg_type = type; 3576 p->sadb_msg_errno = 0; 3577 p->sadb_msg_satype = satype; 3578 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3579 p->sadb_msg_reserved = reserved; 3580 p->sadb_msg_seq = seq; 3581 p->sadb_msg_pid = (u_int32_t)pid; 3582 3583 return m; 3584} 3585 3586/* 3587 * copy secasvar data into sadb_address. 3588 */ 3589static struct mbuf * 3590key_setsadbsa(sav) 3591 struct secasvar *sav; 3592{ 3593 struct mbuf *m; 3594 struct sadb_sa *p; 3595 int len; 3596 3597 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3598 m = key_alloc_mbuf(len); 3599 if (!m || m->m_next) { /*XXX*/ 3600 if (m) 3601 m_freem(m); 3602 return NULL; 3603 } 3604 3605 p = mtod(m, struct sadb_sa *); 3606 3607 bzero(p, len); 3608 p->sadb_sa_len = PFKEY_UNIT64(len); 3609 p->sadb_sa_exttype = SADB_EXT_SA; 3610 p->sadb_sa_spi = sav->spi; 3611 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3612 p->sadb_sa_state = sav->state; 3613 p->sadb_sa_auth = sav->alg_auth; 3614 p->sadb_sa_encrypt = sav->alg_enc; 3615 p->sadb_sa_flags = sav->flags; 3616 3617 return m; 3618} 3619 3620/* 3621 * set data into sadb_address. 3622 */ 3623static struct mbuf * 3624key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3625{ 3626 struct mbuf *m; 3627 struct sadb_address *p; 3628 size_t len; 3629 3630 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3631 PFKEY_ALIGN8(saddr->sa_len); 3632 m = key_alloc_mbuf(len); 3633 if (!m || m->m_next) { /*XXX*/ 3634 if (m) 3635 m_freem(m); 3636 return NULL; 3637 } 3638 3639 p = mtod(m, struct sadb_address *); 3640 3641 bzero(p, len); 3642 p->sadb_address_len = PFKEY_UNIT64(len); 3643 p->sadb_address_exttype = exttype; 3644 p->sadb_address_proto = ul_proto; 3645 if (prefixlen == FULLMASK) { 3646 switch (saddr->sa_family) { 3647 case AF_INET: 3648 prefixlen = sizeof(struct in_addr) << 3; 3649 break; 3650 case AF_INET6: 3651 prefixlen = sizeof(struct in6_addr) << 3; 3652 break; 3653 default: 3654 ; /*XXX*/ 3655 } 3656 } 3657 p->sadb_address_prefixlen = prefixlen; 3658 p->sadb_address_reserved = 0; 3659 3660 bcopy(saddr, 3661 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3662 saddr->sa_len); 3663 3664 return m; 3665} 3666 3667/* 3668 * set data into sadb_x_sa2. 3669 */ 3670static struct mbuf * 3671key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3672{ 3673 struct mbuf *m; 3674 struct sadb_x_sa2 *p; 3675 size_t len; 3676 3677 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3678 m = key_alloc_mbuf(len); 3679 if (!m || m->m_next) { /*XXX*/ 3680 if (m) 3681 m_freem(m); 3682 return NULL; 3683 } 3684 3685 p = mtod(m, struct sadb_x_sa2 *); 3686 3687 bzero(p, len); 3688 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3689 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3690 p->sadb_x_sa2_mode = mode; 3691 p->sadb_x_sa2_reserved1 = 0; 3692 p->sadb_x_sa2_reserved2 = 0; 3693 p->sadb_x_sa2_sequence = seq; 3694 p->sadb_x_sa2_reqid = reqid; 3695 3696 return m; 3697} 3698 3699#ifdef IPSEC_NAT_T 3700/* 3701 * Set a type in sadb_x_nat_t_type. 3702 */ 3703static struct mbuf * 3704key_setsadbxtype(u_int16_t type) 3705{ 3706 struct mbuf *m; 3707 size_t len; 3708 struct sadb_x_nat_t_type *p; 3709 3710 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3711 3712 m = key_alloc_mbuf(len); 3713 if (!m || m->m_next) { /*XXX*/ 3714 if (m) 3715 m_freem(m); 3716 return (NULL); 3717 } 3718 3719 p = mtod(m, struct sadb_x_nat_t_type *); 3720 3721 bzero(p, len); 3722 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3723 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3724 p->sadb_x_nat_t_type_type = type; 3725 3726 return (m); 3727} 3728/* 3729 * Set a port in sadb_x_nat_t_port. 3730 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3731 */ 3732static struct mbuf * 3733key_setsadbxport(u_int16_t port, u_int16_t type) 3734{ 3735 struct mbuf *m; 3736 size_t len; 3737 struct sadb_x_nat_t_port *p; 3738 3739 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3740 3741 m = key_alloc_mbuf(len); 3742 if (!m || m->m_next) { /*XXX*/ 3743 if (m) 3744 m_freem(m); 3745 return (NULL); 3746 } 3747 3748 p = mtod(m, struct sadb_x_nat_t_port *); 3749 3750 bzero(p, len); 3751 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3752 p->sadb_x_nat_t_port_exttype = type; 3753 p->sadb_x_nat_t_port_port = port; 3754 3755 return (m); 3756} 3757 3758/* 3759 * Get port from sockaddr. Port is in network byte order. 3760 */ 3761u_int16_t 3762key_portfromsaddr(struct sockaddr *sa) 3763{ 3764 3765 switch (sa->sa_family) { 3766#ifdef INET 3767 case AF_INET: 3768 return ((struct sockaddr_in *)sa)->sin_port; 3769#endif 3770#ifdef INET6 3771 case AF_INET6: 3772 return ((struct sockaddr_in6 *)sa)->sin6_port; 3773#endif 3774 } 3775 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3776 printf("DP %s unexpected address family %d\n", 3777 __func__, sa->sa_family)); 3778 return (0); 3779} 3780#endif /* IPSEC_NAT_T */ 3781 3782/* 3783 * Set port in struct sockaddr. Port is in network byte order. 3784 */ 3785static void 3786key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3787{ 3788 3789 switch (sa->sa_family) { 3790#ifdef INET 3791 case AF_INET: 3792 ((struct sockaddr_in *)sa)->sin_port = port; 3793 break; 3794#endif 3795#ifdef INET6 3796 case AF_INET6: 3797 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3798 break; 3799#endif 3800 default: 3801 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3802 __func__, sa->sa_family)); 3803 break; 3804 } 3805} 3806 3807/* 3808 * set data into sadb_x_policy 3809 */ 3810static struct mbuf * 3811key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3812{ 3813 struct mbuf *m; 3814 struct sadb_x_policy *p; 3815 size_t len; 3816 3817 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3818 m = key_alloc_mbuf(len); 3819 if (!m || m->m_next) { /*XXX*/ 3820 if (m) 3821 m_freem(m); 3822 return NULL; 3823 } 3824 3825 p = mtod(m, struct sadb_x_policy *); 3826 3827 bzero(p, len); 3828 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3829 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3830 p->sadb_x_policy_type = type; 3831 p->sadb_x_policy_dir = dir; 3832 p->sadb_x_policy_id = id; 3833 3834 return m; 3835} 3836 3837/* %%% utilities */ 3838/* Take a key message (sadb_key) from the socket and turn it into one 3839 * of the kernel's key structures (seckey). 3840 * 3841 * IN: pointer to the src 3842 * OUT: NULL no more memory 3843 */ 3844struct seckey * 3845key_dup_keymsg(const struct sadb_key *src, u_int len, 3846 struct malloc_type *type) 3847{ 3848 struct seckey *dst; 3849 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3850 if (dst != NULL) { 3851 dst->bits = src->sadb_key_bits; 3852 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3853 if (dst->key_data != NULL) { 3854 bcopy((const char *)src + sizeof(struct sadb_key), 3855 dst->key_data, len); 3856 } else { 3857 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3858 __func__)); 3859 free(dst, type); 3860 dst = NULL; 3861 } 3862 } else { 3863 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3864 __func__)); 3865 3866 } 3867 return dst; 3868} 3869 3870/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3871 * turn it into one of the kernel's lifetime structures (seclifetime). 3872 * 3873 * IN: pointer to the destination, source and malloc type 3874 * OUT: NULL, no more memory 3875 */ 3876 3877static struct seclifetime * 3878key_dup_lifemsg(const struct sadb_lifetime *src, 3879 struct malloc_type *type) 3880{ 3881 struct seclifetime *dst = NULL; 3882 3883 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3884 type, M_NOWAIT); 3885 if (dst == NULL) { 3886 /* XXX counter */ 3887 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3888 } else { 3889 dst->allocations = src->sadb_lifetime_allocations; 3890 dst->bytes = src->sadb_lifetime_bytes; 3891 dst->addtime = src->sadb_lifetime_addtime; 3892 dst->usetime = src->sadb_lifetime_usetime; 3893 } 3894 return dst; 3895} 3896 3897/* compare my own address 3898 * OUT: 1: true, i.e. my address. 3899 * 0: false 3900 */ 3901int 3902key_ismyaddr(sa) 3903 struct sockaddr *sa; 3904{ 3905#ifdef INET 3906 struct sockaddr_in *sin; 3907 struct in_ifaddr *ia; 3908#endif 3909 3910 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3911 3912 switch (sa->sa_family) { 3913#ifdef INET 3914 case AF_INET: 3915 sin = (struct sockaddr_in *)sa; 3916 IN_IFADDR_RLOCK(); 3917 for (ia = V_in_ifaddrhead.tqh_first; ia; 3918 ia = ia->ia_link.tqe_next) 3919 { 3920 if (sin->sin_family == ia->ia_addr.sin_family && 3921 sin->sin_len == ia->ia_addr.sin_len && 3922 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3923 { 3924 IN_IFADDR_RUNLOCK(); 3925 return 1; 3926 } 3927 } 3928 IN_IFADDR_RUNLOCK(); 3929 break; 3930#endif 3931#ifdef INET6 3932 case AF_INET6: 3933 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3934#endif 3935 } 3936 3937 return 0; 3938} 3939 3940#ifdef INET6 3941/* 3942 * compare my own address for IPv6. 3943 * 1: ours 3944 * 0: other 3945 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3946 */ 3947#include <netinet6/in6_var.h> 3948 3949static int 3950key_ismyaddr6(sin6) 3951 struct sockaddr_in6 *sin6; 3952{ 3953 struct in6_ifaddr *ia; 3954#if 0 3955 struct in6_multi *in6m; 3956#endif 3957 3958 IN6_IFADDR_RLOCK(); 3959 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3960 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3961 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3962 IN6_IFADDR_RUNLOCK(); 3963 return 1; 3964 } 3965 3966#if 0 3967 /* 3968 * XXX Multicast 3969 * XXX why do we care about multlicast here while we don't care 3970 * about IPv4 multicast?? 3971 * XXX scope 3972 */ 3973 in6m = NULL; 3974 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3975 if (in6m) { 3976 IN6_IFADDR_RUNLOCK(); 3977 return 1; 3978 } 3979#endif 3980 } 3981 IN6_IFADDR_RUNLOCK(); 3982 3983 /* loopback, just for safety */ 3984 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3985 return 1; 3986 3987 return 0; 3988} 3989#endif /*INET6*/ 3990 3991/* 3992 * compare two secasindex structure. 3993 * flag can specify to compare 2 saidxes. 3994 * compare two secasindex structure without both mode and reqid. 3995 * don't compare port. 3996 * IN: 3997 * saidx0: source, it can be in SAD. 3998 * saidx1: object. 3999 * OUT: 4000 * 1 : equal 4001 * 0 : not equal 4002 */ 4003static int 4004key_cmpsaidx( 4005 const struct secasindex *saidx0, 4006 const struct secasindex *saidx1, 4007 int flag) 4008{ 4009 int chkport = 0; 4010 4011 /* sanity */ 4012 if (saidx0 == NULL && saidx1 == NULL) 4013 return 1; 4014 4015 if (saidx0 == NULL || saidx1 == NULL) 4016 return 0; 4017 4018 if (saidx0->proto != saidx1->proto) 4019 return 0; 4020 4021 if (flag == CMP_EXACTLY) { 4022 if (saidx0->mode != saidx1->mode) 4023 return 0; 4024 if (saidx0->reqid != saidx1->reqid) 4025 return 0; 4026 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4027 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4028 return 0; 4029 } else { 4030 4031 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4032 if (flag == CMP_MODE_REQID 4033 ||flag == CMP_REQID) { 4034 /* 4035 * If reqid of SPD is non-zero, unique SA is required. 4036 * The result must be of same reqid in this case. 4037 */ 4038 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4039 return 0; 4040 } 4041 4042 if (flag == CMP_MODE_REQID) { 4043 if (saidx0->mode != IPSEC_MODE_ANY 4044 && saidx0->mode != saidx1->mode) 4045 return 0; 4046 } 4047 4048#ifdef IPSEC_NAT_T 4049 /* 4050 * If NAT-T is enabled, check ports for tunnel mode. 4051 * Do not check ports if they are set to zero in the SPD. 4052 * Also do not do it for transport mode, as there is no 4053 * port information available in the SP. 4054 */ 4055 if (saidx1->mode == IPSEC_MODE_TUNNEL && 4056 saidx1->src.sa.sa_family == AF_INET && 4057 saidx1->dst.sa.sa_family == AF_INET && 4058 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 4059 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 4060 chkport = 1; 4061#endif /* IPSEC_NAT_T */ 4062 4063 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 4064 return 0; 4065 } 4066 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 4067 return 0; 4068 } 4069 } 4070 4071 return 1; 4072} 4073 4074/* 4075 * compare two secindex structure exactly. 4076 * IN: 4077 * spidx0: source, it is often in SPD. 4078 * spidx1: object, it is often from PFKEY message. 4079 * OUT: 4080 * 1 : equal 4081 * 0 : not equal 4082 */ 4083static int 4084key_cmpspidx_exactly( 4085 struct secpolicyindex *spidx0, 4086 struct secpolicyindex *spidx1) 4087{ 4088 /* sanity */ 4089 if (spidx0 == NULL && spidx1 == NULL) 4090 return 1; 4091 4092 if (spidx0 == NULL || spidx1 == NULL) 4093 return 0; 4094 4095 if (spidx0->prefs != spidx1->prefs 4096 || spidx0->prefd != spidx1->prefd 4097 || spidx0->ul_proto != spidx1->ul_proto) 4098 return 0; 4099 4100 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4101 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4102} 4103 4104/* 4105 * compare two secindex structure with mask. 4106 * IN: 4107 * spidx0: source, it is often in SPD. 4108 * spidx1: object, it is often from IP header. 4109 * OUT: 4110 * 1 : equal 4111 * 0 : not equal 4112 */ 4113static int 4114key_cmpspidx_withmask( 4115 struct secpolicyindex *spidx0, 4116 struct secpolicyindex *spidx1) 4117{ 4118 /* sanity */ 4119 if (spidx0 == NULL && spidx1 == NULL) 4120 return 1; 4121 4122 if (spidx0 == NULL || spidx1 == NULL) 4123 return 0; 4124 4125 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4126 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4127 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4128 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4129 return 0; 4130 4131 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4132 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4133 && spidx0->ul_proto != spidx1->ul_proto) 4134 return 0; 4135 4136 switch (spidx0->src.sa.sa_family) { 4137 case AF_INET: 4138 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4139 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4140 return 0; 4141 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4142 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4143 return 0; 4144 break; 4145 case AF_INET6: 4146 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4147 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4148 return 0; 4149 /* 4150 * scope_id check. if sin6_scope_id is 0, we regard it 4151 * as a wildcard scope, which matches any scope zone ID. 4152 */ 4153 if (spidx0->src.sin6.sin6_scope_id && 4154 spidx1->src.sin6.sin6_scope_id && 4155 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4156 return 0; 4157 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4158 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4159 return 0; 4160 break; 4161 default: 4162 /* XXX */ 4163 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4164 return 0; 4165 break; 4166 } 4167 4168 switch (spidx0->dst.sa.sa_family) { 4169 case AF_INET: 4170 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4171 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4172 return 0; 4173 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4174 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4175 return 0; 4176 break; 4177 case AF_INET6: 4178 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4179 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4180 return 0; 4181 /* 4182 * scope_id check. if sin6_scope_id is 0, we regard it 4183 * as a wildcard scope, which matches any scope zone ID. 4184 */ 4185 if (spidx0->dst.sin6.sin6_scope_id && 4186 spidx1->dst.sin6.sin6_scope_id && 4187 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4188 return 0; 4189 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4190 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4191 return 0; 4192 break; 4193 default: 4194 /* XXX */ 4195 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4196 return 0; 4197 break; 4198 } 4199 4200 /* XXX Do we check other field ? e.g. flowinfo */ 4201 4202 return 1; 4203} 4204 4205/* returns 0 on match */ 4206static int 4207key_sockaddrcmp( 4208 const struct sockaddr *sa1, 4209 const struct sockaddr *sa2, 4210 int port) 4211{ 4212#ifdef satosin 4213#undef satosin 4214#endif 4215#define satosin(s) ((const struct sockaddr_in *)s) 4216#ifdef satosin6 4217#undef satosin6 4218#endif 4219#define satosin6(s) ((const struct sockaddr_in6 *)s) 4220 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4221 return 1; 4222 4223 switch (sa1->sa_family) { 4224 case AF_INET: 4225 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4226 return 1; 4227 if (satosin(sa1)->sin_addr.s_addr != 4228 satosin(sa2)->sin_addr.s_addr) { 4229 return 1; 4230 } 4231 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4232 return 1; 4233 break; 4234 case AF_INET6: 4235 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4236 return 1; /*EINVAL*/ 4237 if (satosin6(sa1)->sin6_scope_id != 4238 satosin6(sa2)->sin6_scope_id) { 4239 return 1; 4240 } 4241 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4242 &satosin6(sa2)->sin6_addr)) { 4243 return 1; 4244 } 4245 if (port && 4246 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4247 return 1; 4248 } 4249 break; 4250 default: 4251 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4252 return 1; 4253 break; 4254 } 4255 4256 return 0; 4257#undef satosin 4258#undef satosin6 4259} 4260 4261/* 4262 * compare two buffers with mask. 4263 * IN: 4264 * addr1: source 4265 * addr2: object 4266 * bits: Number of bits to compare 4267 * OUT: 4268 * 1 : equal 4269 * 0 : not equal 4270 */ 4271static int 4272key_bbcmp(const void *a1, const void *a2, u_int bits) 4273{ 4274 const unsigned char *p1 = a1; 4275 const unsigned char *p2 = a2; 4276 4277 /* XXX: This could be considerably faster if we compare a word 4278 * at a time, but it is complicated on LSB Endian machines */ 4279 4280 /* Handle null pointers */ 4281 if (p1 == NULL || p2 == NULL) 4282 return (p1 == p2); 4283 4284 while (bits >= 8) { 4285 if (*p1++ != *p2++) 4286 return 0; 4287 bits -= 8; 4288 } 4289 4290 if (bits > 0) { 4291 u_int8_t mask = ~((1<<(8-bits))-1); 4292 if ((*p1 & mask) != (*p2 & mask)) 4293 return 0; 4294 } 4295 return 1; /* Match! */ 4296} 4297 4298static void 4299key_flush_spd(time_t now) 4300{ 4301 static u_int16_t sptree_scangen = 0; 4302 u_int16_t gen = sptree_scangen++; 4303 struct secpolicy *sp; 4304 u_int dir; 4305 4306 /* SPD */ 4307 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4308restart: 4309 SPTREE_LOCK(); 4310 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4311 if (sp->scangen == gen) /* previously handled */ 4312 continue; 4313 sp->scangen = gen; 4314 if (sp->state == IPSEC_SPSTATE_DEAD && 4315 sp->refcnt == 1) { 4316 /* 4317 * Ensure that we only decrease refcnt once, 4318 * when we're the last consumer. 4319 * Directly call SP_DELREF/key_delsp instead 4320 * of KEY_FREESP to avoid unlocking/relocking 4321 * SPTREE_LOCK before key_delsp: may refcnt 4322 * be increased again during that time ? 4323 * NB: also clean entries created by 4324 * key_spdflush 4325 */ 4326 SP_DELREF(sp); 4327 key_delsp(sp); 4328 SPTREE_UNLOCK(); 4329 goto restart; 4330 } 4331 if (sp->lifetime == 0 && sp->validtime == 0) 4332 continue; 4333 if ((sp->lifetime && now - sp->created > sp->lifetime) 4334 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4335 sp->state = IPSEC_SPSTATE_DEAD; 4336 SPTREE_UNLOCK(); 4337 key_spdexpire(sp); 4338 goto restart; 4339 } 4340 } 4341 SPTREE_UNLOCK(); 4342 } 4343} 4344 4345static void 4346key_flush_sad(time_t now) 4347{ 4348 struct secashead *sah, *nextsah; 4349 struct secasvar *sav, *nextsav; 4350 4351 /* SAD */ 4352 SAHTREE_LOCK(); 4353 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4354 /* if sah has been dead, then delete it and process next sah. */ 4355 if (sah->state == SADB_SASTATE_DEAD) { 4356 key_delsah(sah); 4357 continue; 4358 } 4359 4360 /* if LARVAL entry doesn't become MATURE, delete it. */ 4361 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4362 /* Need to also check refcnt for a larval SA ??? */ 4363 if (now - sav->created > V_key_larval_lifetime) 4364 KEY_FREESAV(&sav); 4365 } 4366 4367 /* 4368 * check MATURE entry to start to send expire message 4369 * whether or not. 4370 */ 4371 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4372 /* we don't need to check. */ 4373 if (sav->lft_s == NULL) 4374 continue; 4375 4376 /* sanity check */ 4377 if (sav->lft_c == NULL) { 4378 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4379 "time, why?\n", __func__)); 4380 continue; 4381 } 4382 4383 /* check SOFT lifetime */ 4384 if (sav->lft_s->addtime != 0 && 4385 now - sav->created > sav->lft_s->addtime) { 4386 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4387 /* 4388 * Actually, only send expire message if 4389 * SA has been used, as it was done before, 4390 * but should we always send such message, 4391 * and let IKE daemon decide if it should be 4392 * renegotiated or not ? 4393 * XXX expire message will actually NOT be 4394 * sent if SA is only used after soft 4395 * lifetime has been reached, see below 4396 * (DYING state) 4397 */ 4398 if (sav->lft_c->usetime != 0) 4399 key_expire(sav); 4400 } 4401 /* check SOFT lifetime by bytes */ 4402 /* 4403 * XXX I don't know the way to delete this SA 4404 * when new SA is installed. Caution when it's 4405 * installed too big lifetime by time. 4406 */ 4407 else if (sav->lft_s->bytes != 0 && 4408 sav->lft_s->bytes < sav->lft_c->bytes) { 4409 4410 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4411 /* 4412 * XXX If we keep to send expire 4413 * message in the status of 4414 * DYING. Do remove below code. 4415 */ 4416 key_expire(sav); 4417 } 4418 } 4419 4420 /* check DYING entry to change status to DEAD. */ 4421 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4422 /* we don't need to check. */ 4423 if (sav->lft_h == NULL) 4424 continue; 4425 4426 /* sanity check */ 4427 if (sav->lft_c == NULL) { 4428 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4429 "time, why?\n", __func__)); 4430 continue; 4431 } 4432 4433 if (sav->lft_h->addtime != 0 && 4434 now - sav->created > sav->lft_h->addtime) { 4435 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4436 KEY_FREESAV(&sav); 4437 } 4438#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4439 else if (sav->lft_s != NULL 4440 && sav->lft_s->addtime != 0 4441 && now - sav->created > sav->lft_s->addtime) { 4442 /* 4443 * XXX: should be checked to be 4444 * installed the valid SA. 4445 */ 4446 4447 /* 4448 * If there is no SA then sending 4449 * expire message. 4450 */ 4451 key_expire(sav); 4452 } 4453#endif 4454 /* check HARD lifetime by bytes */ 4455 else if (sav->lft_h->bytes != 0 && 4456 sav->lft_h->bytes < sav->lft_c->bytes) { 4457 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4458 KEY_FREESAV(&sav); 4459 } 4460 } 4461 4462 /* delete entry in DEAD */ 4463 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4464 /* sanity check */ 4465 if (sav->state != SADB_SASTATE_DEAD) { 4466 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4467 "(queue: %d SA: %d): kill it anyway\n", 4468 __func__, 4469 SADB_SASTATE_DEAD, sav->state)); 4470 } 4471 /* 4472 * do not call key_freesav() here. 4473 * sav should already be freed, and sav->refcnt 4474 * shows other references to sav 4475 * (such as from SPD). 4476 */ 4477 } 4478 } 4479 SAHTREE_UNLOCK(); 4480} 4481 4482static void 4483key_flush_acq(time_t now) 4484{ 4485 struct secacq *acq, *nextacq; 4486 4487 /* ACQ tree */ 4488 ACQ_LOCK(); 4489 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4490 nextacq = LIST_NEXT(acq, chain); 4491 if (now - acq->created > V_key_blockacq_lifetime 4492 && __LIST_CHAINED(acq)) { 4493 LIST_REMOVE(acq, chain); 4494 free(acq, M_IPSEC_SAQ); 4495 } 4496 } 4497 ACQ_UNLOCK(); 4498} 4499 4500static void 4501key_flush_spacq(time_t now) 4502{ 4503 struct secspacq *acq, *nextacq; 4504 4505 /* SP ACQ tree */ 4506 SPACQ_LOCK(); 4507 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4508 nextacq = LIST_NEXT(acq, chain); 4509 if (now - acq->created > V_key_blockacq_lifetime 4510 && __LIST_CHAINED(acq)) { 4511 LIST_REMOVE(acq, chain); 4512 free(acq, M_IPSEC_SAQ); 4513 } 4514 } 4515 SPACQ_UNLOCK(); 4516} 4517 4518/* 4519 * time handler. 4520 * scanning SPD and SAD to check status for each entries, 4521 * and do to remove or to expire. 4522 * XXX: year 2038 problem may remain. 4523 */ 4524void 4525key_timehandler(void) 4526{ 4527 VNET_ITERATOR_DECL(vnet_iter); 4528 time_t now = time_second; 4529 4530 VNET_LIST_RLOCK_NOSLEEP(); 4531 VNET_FOREACH(vnet_iter) { 4532 CURVNET_SET(vnet_iter); 4533 key_flush_spd(now); 4534 key_flush_sad(now); 4535 key_flush_acq(now); 4536 key_flush_spacq(now); 4537 CURVNET_RESTORE(); 4538 } 4539 VNET_LIST_RUNLOCK_NOSLEEP(); 4540 4541#ifndef IPSEC_DEBUG2 4542 /* do exchange to tick time !! */ 4543 (void)timeout((void *)key_timehandler, (void *)0, hz); 4544#endif /* IPSEC_DEBUG2 */ 4545} 4546 4547u_long 4548key_random() 4549{ 4550 u_long value; 4551 4552 key_randomfill(&value, sizeof(value)); 4553 return value; 4554} 4555 4556void 4557key_randomfill(p, l) 4558 void *p; 4559 size_t l; 4560{ 4561 size_t n; 4562 u_long v; 4563 static int warn = 1; 4564 4565 n = 0; 4566 n = (size_t)read_random(p, (u_int)l); 4567 /* last resort */ 4568 while (n < l) { 4569 v = random(); 4570 bcopy(&v, (u_int8_t *)p + n, 4571 l - n < sizeof(v) ? l - n : sizeof(v)); 4572 n += sizeof(v); 4573 4574 if (warn) { 4575 printf("WARNING: pseudo-random number generator " 4576 "used for IPsec processing\n"); 4577 warn = 0; 4578 } 4579 } 4580} 4581 4582/* 4583 * map SADB_SATYPE_* to IPPROTO_*. 4584 * if satype == SADB_SATYPE then satype is mapped to ~0. 4585 * OUT: 4586 * 0: invalid satype. 4587 */ 4588static u_int16_t 4589key_satype2proto(u_int8_t satype) 4590{ 4591 switch (satype) { 4592 case SADB_SATYPE_UNSPEC: 4593 return IPSEC_PROTO_ANY; 4594 case SADB_SATYPE_AH: 4595 return IPPROTO_AH; 4596 case SADB_SATYPE_ESP: 4597 return IPPROTO_ESP; 4598 case SADB_X_SATYPE_IPCOMP: 4599 return IPPROTO_IPCOMP; 4600 case SADB_X_SATYPE_TCPSIGNATURE: 4601 return IPPROTO_TCP; 4602 default: 4603 return 0; 4604 } 4605 /* NOTREACHED */ 4606} 4607 4608/* 4609 * map IPPROTO_* to SADB_SATYPE_* 4610 * OUT: 4611 * 0: invalid protocol type. 4612 */ 4613static u_int8_t 4614key_proto2satype(u_int16_t proto) 4615{ 4616 switch (proto) { 4617 case IPPROTO_AH: 4618 return SADB_SATYPE_AH; 4619 case IPPROTO_ESP: 4620 return SADB_SATYPE_ESP; 4621 case IPPROTO_IPCOMP: 4622 return SADB_X_SATYPE_IPCOMP; 4623 case IPPROTO_TCP: 4624 return SADB_X_SATYPE_TCPSIGNATURE; 4625 default: 4626 return 0; 4627 } 4628 /* NOTREACHED */ 4629} 4630 4631/* %%% PF_KEY */ 4632/* 4633 * SADB_GETSPI processing is to receive 4634 * <base, (SA2), src address, dst address, (SPI range)> 4635 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4636 * tree with the status of LARVAL, and send 4637 * <base, SA(*), address(SD)> 4638 * to the IKMPd. 4639 * 4640 * IN: mhp: pointer to the pointer to each header. 4641 * OUT: NULL if fail. 4642 * other if success, return pointer to the message to send. 4643 */ 4644static int 4645key_getspi(so, m, mhp) 4646 struct socket *so; 4647 struct mbuf *m; 4648 const struct sadb_msghdr *mhp; 4649{ 4650 struct sadb_address *src0, *dst0; 4651 struct secasindex saidx; 4652 struct secashead *newsah; 4653 struct secasvar *newsav; 4654 u_int8_t proto; 4655 u_int32_t spi; 4656 u_int8_t mode; 4657 u_int32_t reqid; 4658 int error; 4659 4660 IPSEC_ASSERT(so != NULL, ("null socket")); 4661 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4662 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4663 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4664 4665 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4666 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4667 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4668 __func__)); 4669 return key_senderror(so, m, EINVAL); 4670 } 4671 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4672 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4673 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4674 __func__)); 4675 return key_senderror(so, m, EINVAL); 4676 } 4677 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4678 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4679 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4680 } else { 4681 mode = IPSEC_MODE_ANY; 4682 reqid = 0; 4683 } 4684 4685 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4686 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4687 4688 /* map satype to proto */ 4689 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4690 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4691 __func__)); 4692 return key_senderror(so, m, EINVAL); 4693 } 4694 4695 /* 4696 * Make sure the port numbers are zero. 4697 * In case of NAT-T we will update them later if needed. 4698 */ 4699 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4700 case AF_INET: 4701 if (((struct sockaddr *)(src0 + 1))->sa_len != 4702 sizeof(struct sockaddr_in)) 4703 return key_senderror(so, m, EINVAL); 4704 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4705 break; 4706 case AF_INET6: 4707 if (((struct sockaddr *)(src0 + 1))->sa_len != 4708 sizeof(struct sockaddr_in6)) 4709 return key_senderror(so, m, EINVAL); 4710 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4711 break; 4712 default: 4713 ; /*???*/ 4714 } 4715 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4716 case AF_INET: 4717 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4718 sizeof(struct sockaddr_in)) 4719 return key_senderror(so, m, EINVAL); 4720 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4721 break; 4722 case AF_INET6: 4723 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4724 sizeof(struct sockaddr_in6)) 4725 return key_senderror(so, m, EINVAL); 4726 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4727 break; 4728 default: 4729 ; /*???*/ 4730 } 4731 4732 /* XXX boundary check against sa_len */ 4733 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4734 4735#ifdef IPSEC_NAT_T 4736 /* 4737 * Handle NAT-T info if present. 4738 * We made sure the port numbers are zero above, so we do 4739 * not have to worry in case we do not update them. 4740 */ 4741 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4742 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4743 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4744 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4745 4746 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4747 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4748 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4749 struct sadb_x_nat_t_type *type; 4750 struct sadb_x_nat_t_port *sport, *dport; 4751 4752 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4753 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4754 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4755 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4756 "passed.\n", __func__)); 4757 return key_senderror(so, m, EINVAL); 4758 } 4759 4760 sport = (struct sadb_x_nat_t_port *) 4761 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4762 dport = (struct sadb_x_nat_t_port *) 4763 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4764 4765 if (sport) 4766 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4767 if (dport) 4768 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4769 } 4770#endif 4771 4772 /* SPI allocation */ 4773 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4774 &saidx); 4775 if (spi == 0) 4776 return key_senderror(so, m, EINVAL); 4777 4778 /* get a SA index */ 4779 if ((newsah = key_getsah(&saidx)) == NULL) { 4780 /* create a new SA index */ 4781 if ((newsah = key_newsah(&saidx)) == NULL) { 4782 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4783 return key_senderror(so, m, ENOBUFS); 4784 } 4785 } 4786 4787 /* get a new SA */ 4788 /* XXX rewrite */ 4789 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4790 if (newsav == NULL) { 4791 /* XXX don't free new SA index allocated in above. */ 4792 return key_senderror(so, m, error); 4793 } 4794 4795 /* set spi */ 4796 newsav->spi = htonl(spi); 4797 4798 /* delete the entry in acqtree */ 4799 if (mhp->msg->sadb_msg_seq != 0) { 4800 struct secacq *acq; 4801 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4802 /* reset counter in order to deletion by timehandler. */ 4803 acq->created = time_second; 4804 acq->count = 0; 4805 } 4806 } 4807 4808 { 4809 struct mbuf *n, *nn; 4810 struct sadb_sa *m_sa; 4811 struct sadb_msg *newmsg; 4812 int off, len; 4813 4814 /* create new sadb_msg to reply. */ 4815 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4816 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4817 4818 MGETHDR(n, M_DONTWAIT, MT_DATA); 4819 if (len > MHLEN) { 4820 MCLGET(n, M_DONTWAIT); 4821 if ((n->m_flags & M_EXT) == 0) { 4822 m_freem(n); 4823 n = NULL; 4824 } 4825 } 4826 if (!n) 4827 return key_senderror(so, m, ENOBUFS); 4828 4829 n->m_len = len; 4830 n->m_next = NULL; 4831 off = 0; 4832 4833 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4834 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4835 4836 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4837 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4838 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4839 m_sa->sadb_sa_spi = htonl(spi); 4840 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4841 4842 IPSEC_ASSERT(off == len, 4843 ("length inconsistency (off %u len %u)", off, len)); 4844 4845 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4846 SADB_EXT_ADDRESS_DST); 4847 if (!n->m_next) { 4848 m_freem(n); 4849 return key_senderror(so, m, ENOBUFS); 4850 } 4851 4852 if (n->m_len < sizeof(struct sadb_msg)) { 4853 n = m_pullup(n, sizeof(struct sadb_msg)); 4854 if (n == NULL) 4855 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4856 } 4857 4858 n->m_pkthdr.len = 0; 4859 for (nn = n; nn; nn = nn->m_next) 4860 n->m_pkthdr.len += nn->m_len; 4861 4862 newmsg = mtod(n, struct sadb_msg *); 4863 newmsg->sadb_msg_seq = newsav->seq; 4864 newmsg->sadb_msg_errno = 0; 4865 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4866 4867 m_freem(m); 4868 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4869 } 4870} 4871 4872/* 4873 * allocating new SPI 4874 * called by key_getspi(). 4875 * OUT: 4876 * 0: failure. 4877 * others: success. 4878 */ 4879static u_int32_t 4880key_do_getnewspi(spirange, saidx) 4881 struct sadb_spirange *spirange; 4882 struct secasindex *saidx; 4883{ 4884 u_int32_t newspi; 4885 u_int32_t min, max; 4886 int count = V_key_spi_trycnt; 4887 4888 /* set spi range to allocate */ 4889 if (spirange != NULL) { 4890 min = spirange->sadb_spirange_min; 4891 max = spirange->sadb_spirange_max; 4892 } else { 4893 min = V_key_spi_minval; 4894 max = V_key_spi_maxval; 4895 } 4896 /* IPCOMP needs 2-byte SPI */ 4897 if (saidx->proto == IPPROTO_IPCOMP) { 4898 u_int32_t t; 4899 if (min >= 0x10000) 4900 min = 0xffff; 4901 if (max >= 0x10000) 4902 max = 0xffff; 4903 if (min > max) { 4904 t = min; min = max; max = t; 4905 } 4906 } 4907 4908 if (min == max) { 4909 if (key_checkspidup(saidx, min) != NULL) { 4910 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4911 __func__, min)); 4912 return 0; 4913 } 4914 4915 count--; /* taking one cost. */ 4916 newspi = min; 4917 4918 } else { 4919 4920 /* init SPI */ 4921 newspi = 0; 4922 4923 /* when requesting to allocate spi ranged */ 4924 while (count--) { 4925 /* generate pseudo-random SPI value ranged. */ 4926 newspi = min + (key_random() % (max - min + 1)); 4927 4928 if (key_checkspidup(saidx, newspi) == NULL) 4929 break; 4930 } 4931 4932 if (count == 0 || newspi == 0) { 4933 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4934 __func__)); 4935 return 0; 4936 } 4937 } 4938 4939 /* statistics */ 4940 keystat.getspi_count = 4941 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4942 4943 return newspi; 4944} 4945 4946/* 4947 * SADB_UPDATE processing 4948 * receive 4949 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4950 * key(AE), (identity(SD),) (sensitivity)> 4951 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4952 * and send 4953 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4954 * (identity(SD),) (sensitivity)> 4955 * to the ikmpd. 4956 * 4957 * m will always be freed. 4958 */ 4959static int 4960key_update(so, m, mhp) 4961 struct socket *so; 4962 struct mbuf *m; 4963 const struct sadb_msghdr *mhp; 4964{ 4965 struct sadb_sa *sa0; 4966 struct sadb_address *src0, *dst0; 4967#ifdef IPSEC_NAT_T 4968 struct sadb_x_nat_t_type *type; 4969 struct sadb_x_nat_t_port *sport, *dport; 4970 struct sadb_address *iaddr, *raddr; 4971 struct sadb_x_nat_t_frag *frag; 4972#endif 4973 struct secasindex saidx; 4974 struct secashead *sah; 4975 struct secasvar *sav; 4976 u_int16_t proto; 4977 u_int8_t mode; 4978 u_int32_t reqid; 4979 int error; 4980 4981 IPSEC_ASSERT(so != NULL, ("null socket")); 4982 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4983 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4984 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4985 4986 /* map satype to proto */ 4987 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4988 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4989 __func__)); 4990 return key_senderror(so, m, EINVAL); 4991 } 4992 4993 if (mhp->ext[SADB_EXT_SA] == NULL || 4994 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4995 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4996 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4997 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4998 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4999 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5000 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5001 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5002 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5003 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5004 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5005 __func__)); 5006 return key_senderror(so, m, EINVAL); 5007 } 5008 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5009 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5010 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5011 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5012 __func__)); 5013 return key_senderror(so, m, EINVAL); 5014 } 5015 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5016 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5017 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5018 } else { 5019 mode = IPSEC_MODE_ANY; 5020 reqid = 0; 5021 } 5022 /* XXX boundary checking for other extensions */ 5023 5024 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5025 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5026 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5027 5028 /* XXX boundary check against sa_len */ 5029 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5030 5031 /* 5032 * Make sure the port numbers are zero. 5033 * In case of NAT-T we will update them later if needed. 5034 */ 5035 KEY_PORTTOSADDR(&saidx.src, 0); 5036 KEY_PORTTOSADDR(&saidx.dst, 0); 5037 5038#ifdef IPSEC_NAT_T 5039 /* 5040 * Handle NAT-T info if present. 5041 */ 5042 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5043 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5044 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5045 5046 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5047 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5048 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5049 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5050 __func__)); 5051 return key_senderror(so, m, EINVAL); 5052 } 5053 5054 type = (struct sadb_x_nat_t_type *) 5055 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5056 sport = (struct sadb_x_nat_t_port *) 5057 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5058 dport = (struct sadb_x_nat_t_port *) 5059 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5060 } else { 5061 type = 0; 5062 sport = dport = 0; 5063 } 5064 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5065 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5066 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5067 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5068 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5069 __func__)); 5070 return key_senderror(so, m, EINVAL); 5071 } 5072 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5073 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5074 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5075 } else { 5076 iaddr = raddr = NULL; 5077 } 5078 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5079 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5080 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5081 __func__)); 5082 return key_senderror(so, m, EINVAL); 5083 } 5084 frag = (struct sadb_x_nat_t_frag *) 5085 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5086 } else { 5087 frag = 0; 5088 } 5089#endif 5090 5091 /* get a SA header */ 5092 if ((sah = key_getsah(&saidx)) == NULL) { 5093 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5094 return key_senderror(so, m, ENOENT); 5095 } 5096 5097 /* set spidx if there */ 5098 /* XXX rewrite */ 5099 error = key_setident(sah, m, mhp); 5100 if (error) 5101 return key_senderror(so, m, error); 5102 5103 /* find a SA with sequence number. */ 5104#ifdef IPSEC_DOSEQCHECK 5105 if (mhp->msg->sadb_msg_seq != 0 5106 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5107 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5108 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5109 return key_senderror(so, m, ENOENT); 5110 } 5111#else 5112 SAHTREE_LOCK(); 5113 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5114 SAHTREE_UNLOCK(); 5115 if (sav == NULL) { 5116 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5117 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5118 return key_senderror(so, m, EINVAL); 5119 } 5120#endif 5121 5122 /* validity check */ 5123 if (sav->sah->saidx.proto != proto) { 5124 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5125 "(DB=%u param=%u)\n", __func__, 5126 sav->sah->saidx.proto, proto)); 5127 return key_senderror(so, m, EINVAL); 5128 } 5129#ifdef IPSEC_DOSEQCHECK 5130 if (sav->spi != sa0->sadb_sa_spi) { 5131 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5132 __func__, 5133 (u_int32_t)ntohl(sav->spi), 5134 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5135 return key_senderror(so, m, EINVAL); 5136 } 5137#endif 5138 if (sav->pid != mhp->msg->sadb_msg_pid) { 5139 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5140 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5141 return key_senderror(so, m, EINVAL); 5142 } 5143 5144 /* copy sav values */ 5145 error = key_setsaval(sav, m, mhp); 5146 if (error) { 5147 KEY_FREESAV(&sav); 5148 return key_senderror(so, m, error); 5149 } 5150 5151 /* check SA values to be mature. */ 5152 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5153 KEY_FREESAV(&sav); 5154 return key_senderror(so, m, 0); 5155 } 5156 5157#ifdef IPSEC_NAT_T 5158 /* 5159 * Handle more NAT-T info if present, 5160 * now that we have a sav to fill. 5161 */ 5162 if (type) 5163 sav->natt_type = type->sadb_x_nat_t_type_type; 5164 5165 if (sport) 5166 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5167 sport->sadb_x_nat_t_port_port); 5168 if (dport) 5169 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5170 dport->sadb_x_nat_t_port_port); 5171 5172#if 0 5173 /* 5174 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5175 * We should actually check for a minimum MTU here, if we 5176 * want to support it in ip_output. 5177 */ 5178 if (frag) 5179 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5180#endif 5181#endif 5182 5183 { 5184 struct mbuf *n; 5185 5186 /* set msg buf from mhp */ 5187 n = key_getmsgbuf_x1(m, mhp); 5188 if (n == NULL) { 5189 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5190 return key_senderror(so, m, ENOBUFS); 5191 } 5192 5193 m_freem(m); 5194 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5195 } 5196} 5197 5198/* 5199 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5200 * only called by key_update(). 5201 * OUT: 5202 * NULL : not found 5203 * others : found, pointer to a SA. 5204 */ 5205#ifdef IPSEC_DOSEQCHECK 5206static struct secasvar * 5207key_getsavbyseq(sah, seq) 5208 struct secashead *sah; 5209 u_int32_t seq; 5210{ 5211 struct secasvar *sav; 5212 u_int state; 5213 5214 state = SADB_SASTATE_LARVAL; 5215 5216 /* search SAD with sequence number ? */ 5217 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5218 5219 KEY_CHKSASTATE(state, sav->state, __func__); 5220 5221 if (sav->seq == seq) { 5222 sa_addref(sav); 5223 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5224 printf("DP %s cause refcnt++:%d SA:%p\n", 5225 __func__, sav->refcnt, sav)); 5226 return sav; 5227 } 5228 } 5229 5230 return NULL; 5231} 5232#endif 5233 5234/* 5235 * SADB_ADD processing 5236 * add an entry to SA database, when received 5237 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5238 * key(AE), (identity(SD),) (sensitivity)> 5239 * from the ikmpd, 5240 * and send 5241 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5242 * (identity(SD),) (sensitivity)> 5243 * to the ikmpd. 5244 * 5245 * IGNORE identity and sensitivity messages. 5246 * 5247 * m will always be freed. 5248 */ 5249static int 5250key_add(so, m, mhp) 5251 struct socket *so; 5252 struct mbuf *m; 5253 const struct sadb_msghdr *mhp; 5254{ 5255 struct sadb_sa *sa0; 5256 struct sadb_address *src0, *dst0; 5257#ifdef IPSEC_NAT_T 5258 struct sadb_x_nat_t_type *type; 5259 struct sadb_address *iaddr, *raddr; 5260 struct sadb_x_nat_t_frag *frag; 5261#endif 5262 struct secasindex saidx; 5263 struct secashead *newsah; 5264 struct secasvar *newsav; 5265 u_int16_t proto; 5266 u_int8_t mode; 5267 u_int32_t reqid; 5268 int error; 5269 5270 IPSEC_ASSERT(so != NULL, ("null socket")); 5271 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5272 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5273 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5274 5275 /* map satype to proto */ 5276 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5277 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5278 __func__)); 5279 return key_senderror(so, m, EINVAL); 5280 } 5281 5282 if (mhp->ext[SADB_EXT_SA] == NULL || 5283 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5284 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5285 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5286 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5287 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5288 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5289 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5290 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5291 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5292 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5293 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5294 __func__)); 5295 return key_senderror(so, m, EINVAL); 5296 } 5297 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5298 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5299 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5300 /* XXX need more */ 5301 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5302 __func__)); 5303 return key_senderror(so, m, EINVAL); 5304 } 5305 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5306 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5307 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5308 } else { 5309 mode = IPSEC_MODE_ANY; 5310 reqid = 0; 5311 } 5312 5313 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5314 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5315 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5316 5317 /* XXX boundary check against sa_len */ 5318 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5319 5320 /* 5321 * Make sure the port numbers are zero. 5322 * In case of NAT-T we will update them later if needed. 5323 */ 5324 KEY_PORTTOSADDR(&saidx.src, 0); 5325 KEY_PORTTOSADDR(&saidx.dst, 0); 5326 5327#ifdef IPSEC_NAT_T 5328 /* 5329 * Handle NAT-T info if present. 5330 */ 5331 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5332 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5333 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5334 struct sadb_x_nat_t_port *sport, *dport; 5335 5336 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5337 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5338 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5339 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5340 __func__)); 5341 return key_senderror(so, m, EINVAL); 5342 } 5343 5344 type = (struct sadb_x_nat_t_type *) 5345 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5346 sport = (struct sadb_x_nat_t_port *) 5347 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5348 dport = (struct sadb_x_nat_t_port *) 5349 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5350 5351 if (sport) 5352 KEY_PORTTOSADDR(&saidx.src, 5353 sport->sadb_x_nat_t_port_port); 5354 if (dport) 5355 KEY_PORTTOSADDR(&saidx.dst, 5356 dport->sadb_x_nat_t_port_port); 5357 } else { 5358 type = 0; 5359 } 5360 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5361 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5362 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5363 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5364 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5365 __func__)); 5366 return key_senderror(so, m, EINVAL); 5367 } 5368 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5369 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5370 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5371 } else { 5372 iaddr = raddr = NULL; 5373 } 5374 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5375 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5376 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5377 __func__)); 5378 return key_senderror(so, m, EINVAL); 5379 } 5380 frag = (struct sadb_x_nat_t_frag *) 5381 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5382 } else { 5383 frag = 0; 5384 } 5385#endif 5386 5387 /* get a SA header */ 5388 if ((newsah = key_getsah(&saidx)) == NULL) { 5389 /* create a new SA header */ 5390 if ((newsah = key_newsah(&saidx)) == NULL) { 5391 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5392 return key_senderror(so, m, ENOBUFS); 5393 } 5394 } 5395 5396 /* set spidx if there */ 5397 /* XXX rewrite */ 5398 error = key_setident(newsah, m, mhp); 5399 if (error) { 5400 return key_senderror(so, m, error); 5401 } 5402 5403 /* create new SA entry. */ 5404 /* We can create new SA only if SPI is differenct. */ 5405 SAHTREE_LOCK(); 5406 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5407 SAHTREE_UNLOCK(); 5408 if (newsav != NULL) { 5409 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5410 return key_senderror(so, m, EEXIST); 5411 } 5412 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5413 if (newsav == NULL) { 5414 return key_senderror(so, m, error); 5415 } 5416 5417 /* check SA values to be mature. */ 5418 if ((error = key_mature(newsav)) != 0) { 5419 KEY_FREESAV(&newsav); 5420 return key_senderror(so, m, error); 5421 } 5422 5423#ifdef IPSEC_NAT_T 5424 /* 5425 * Handle more NAT-T info if present, 5426 * now that we have a sav to fill. 5427 */ 5428 if (type) 5429 newsav->natt_type = type->sadb_x_nat_t_type_type; 5430 5431#if 0 5432 /* 5433 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5434 * We should actually check for a minimum MTU here, if we 5435 * want to support it in ip_output. 5436 */ 5437 if (frag) 5438 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5439#endif 5440#endif 5441 5442 /* 5443 * don't call key_freesav() here, as we would like to keep the SA 5444 * in the database on success. 5445 */ 5446 5447 { 5448 struct mbuf *n; 5449 5450 /* set msg buf from mhp */ 5451 n = key_getmsgbuf_x1(m, mhp); 5452 if (n == NULL) { 5453 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5454 return key_senderror(so, m, ENOBUFS); 5455 } 5456 5457 m_freem(m); 5458 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5459 } 5460} 5461 5462/* m is retained */ 5463static int 5464key_setident(sah, m, mhp) 5465 struct secashead *sah; 5466 struct mbuf *m; 5467 const struct sadb_msghdr *mhp; 5468{ 5469 const struct sadb_ident *idsrc, *iddst; 5470 int idsrclen, iddstlen; 5471 5472 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5473 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5474 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5475 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5476 5477 /* don't make buffer if not there */ 5478 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5479 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5480 sah->idents = NULL; 5481 sah->identd = NULL; 5482 return 0; 5483 } 5484 5485 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5486 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5487 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5488 return EINVAL; 5489 } 5490 5491 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5492 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5493 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5494 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5495 5496 /* validity check */ 5497 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5498 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5499 return EINVAL; 5500 } 5501 5502 switch (idsrc->sadb_ident_type) { 5503 case SADB_IDENTTYPE_PREFIX: 5504 case SADB_IDENTTYPE_FQDN: 5505 case SADB_IDENTTYPE_USERFQDN: 5506 default: 5507 /* XXX do nothing */ 5508 sah->idents = NULL; 5509 sah->identd = NULL; 5510 return 0; 5511 } 5512 5513 /* make structure */ 5514 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5515 if (sah->idents == NULL) { 5516 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5517 return ENOBUFS; 5518 } 5519 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5520 if (sah->identd == NULL) { 5521 free(sah->idents, M_IPSEC_MISC); 5522 sah->idents = NULL; 5523 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5524 return ENOBUFS; 5525 } 5526 sah->idents->type = idsrc->sadb_ident_type; 5527 sah->idents->id = idsrc->sadb_ident_id; 5528 5529 sah->identd->type = iddst->sadb_ident_type; 5530 sah->identd->id = iddst->sadb_ident_id; 5531 5532 return 0; 5533} 5534 5535/* 5536 * m will not be freed on return. 5537 * it is caller's responsibility to free the result. 5538 */ 5539static struct mbuf * 5540key_getmsgbuf_x1(m, mhp) 5541 struct mbuf *m; 5542 const struct sadb_msghdr *mhp; 5543{ 5544 struct mbuf *n; 5545 5546 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5547 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5548 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5549 5550 /* create new sadb_msg to reply. */ 5551 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5552 SADB_EXT_SA, SADB_X_EXT_SA2, 5553 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5554 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5555 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5556 if (!n) 5557 return NULL; 5558 5559 if (n->m_len < sizeof(struct sadb_msg)) { 5560 n = m_pullup(n, sizeof(struct sadb_msg)); 5561 if (n == NULL) 5562 return NULL; 5563 } 5564 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5565 mtod(n, struct sadb_msg *)->sadb_msg_len = 5566 PFKEY_UNIT64(n->m_pkthdr.len); 5567 5568 return n; 5569} 5570 5571static int key_delete_all __P((struct socket *, struct mbuf *, 5572 const struct sadb_msghdr *, u_int16_t)); 5573 5574/* 5575 * SADB_DELETE processing 5576 * receive 5577 * <base, SA(*), address(SD)> 5578 * from the ikmpd, and set SADB_SASTATE_DEAD, 5579 * and send, 5580 * <base, SA(*), address(SD)> 5581 * to the ikmpd. 5582 * 5583 * m will always be freed. 5584 */ 5585static int 5586key_delete(so, m, mhp) 5587 struct socket *so; 5588 struct mbuf *m; 5589 const struct sadb_msghdr *mhp; 5590{ 5591 struct sadb_sa *sa0; 5592 struct sadb_address *src0, *dst0; 5593 struct secasindex saidx; 5594 struct secashead *sah; 5595 struct secasvar *sav = NULL; 5596 u_int16_t proto; 5597 5598 IPSEC_ASSERT(so != NULL, ("null socket")); 5599 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5600 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5601 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5602 5603 /* map satype to proto */ 5604 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5605 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5606 __func__)); 5607 return key_senderror(so, m, EINVAL); 5608 } 5609 5610 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5611 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5612 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5613 __func__)); 5614 return key_senderror(so, m, EINVAL); 5615 } 5616 5617 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5618 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5619 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5620 __func__)); 5621 return key_senderror(so, m, EINVAL); 5622 } 5623 5624 if (mhp->ext[SADB_EXT_SA] == NULL) { 5625 /* 5626 * Caller wants us to delete all non-LARVAL SAs 5627 * that match the src/dst. This is used during 5628 * IKE INITIAL-CONTACT. 5629 */ 5630 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5631 return key_delete_all(so, m, mhp, proto); 5632 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5633 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5634 __func__)); 5635 return key_senderror(so, m, EINVAL); 5636 } 5637 5638 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5639 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5640 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5641 5642 /* XXX boundary check against sa_len */ 5643 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5644 5645 /* 5646 * Make sure the port numbers are zero. 5647 * In case of NAT-T we will update them later if needed. 5648 */ 5649 KEY_PORTTOSADDR(&saidx.src, 0); 5650 KEY_PORTTOSADDR(&saidx.dst, 0); 5651 5652#ifdef IPSEC_NAT_T 5653 /* 5654 * Handle NAT-T info if present. 5655 */ 5656 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5657 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5658 struct sadb_x_nat_t_port *sport, *dport; 5659 5660 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5661 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5662 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5663 __func__)); 5664 return key_senderror(so, m, EINVAL); 5665 } 5666 5667 sport = (struct sadb_x_nat_t_port *) 5668 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5669 dport = (struct sadb_x_nat_t_port *) 5670 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5671 5672 if (sport) 5673 KEY_PORTTOSADDR(&saidx.src, 5674 sport->sadb_x_nat_t_port_port); 5675 if (dport) 5676 KEY_PORTTOSADDR(&saidx.dst, 5677 dport->sadb_x_nat_t_port_port); 5678 } 5679#endif 5680 5681 /* get a SA header */ 5682 SAHTREE_LOCK(); 5683 LIST_FOREACH(sah, &V_sahtree, chain) { 5684 if (sah->state == SADB_SASTATE_DEAD) 5685 continue; 5686 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5687 continue; 5688 5689 /* get a SA with SPI. */ 5690 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5691 if (sav) 5692 break; 5693 } 5694 if (sah == NULL) { 5695 SAHTREE_UNLOCK(); 5696 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5697 return key_senderror(so, m, ENOENT); 5698 } 5699 5700 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5701 SAHTREE_UNLOCK(); 5702 KEY_FREESAV(&sav); 5703 5704 { 5705 struct mbuf *n; 5706 struct sadb_msg *newmsg; 5707 5708 /* create new sadb_msg to reply. */ 5709 /* XXX-BZ NAT-T extensions? */ 5710 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5711 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5712 if (!n) 5713 return key_senderror(so, m, ENOBUFS); 5714 5715 if (n->m_len < sizeof(struct sadb_msg)) { 5716 n = m_pullup(n, sizeof(struct sadb_msg)); 5717 if (n == NULL) 5718 return key_senderror(so, m, ENOBUFS); 5719 } 5720 newmsg = mtod(n, struct sadb_msg *); 5721 newmsg->sadb_msg_errno = 0; 5722 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5723 5724 m_freem(m); 5725 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5726 } 5727} 5728 5729/* 5730 * delete all SAs for src/dst. Called from key_delete(). 5731 */ 5732static int 5733key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5734 u_int16_t proto) 5735{ 5736 struct sadb_address *src0, *dst0; 5737 struct secasindex saidx; 5738 struct secashead *sah; 5739 struct secasvar *sav, *nextsav; 5740 u_int stateidx, state; 5741 5742 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5743 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5744 5745 /* XXX boundary check against sa_len */ 5746 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5747 5748 /* 5749 * Make sure the port numbers are zero. 5750 * In case of NAT-T we will update them later if needed. 5751 */ 5752 KEY_PORTTOSADDR(&saidx.src, 0); 5753 KEY_PORTTOSADDR(&saidx.dst, 0); 5754 5755#ifdef IPSEC_NAT_T 5756 /* 5757 * Handle NAT-T info if present. 5758 */ 5759 5760 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5761 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5762 struct sadb_x_nat_t_port *sport, *dport; 5763 5764 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5765 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5766 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5767 __func__)); 5768 return key_senderror(so, m, EINVAL); 5769 } 5770 5771 sport = (struct sadb_x_nat_t_port *) 5772 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5773 dport = (struct sadb_x_nat_t_port *) 5774 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5775 5776 if (sport) 5777 KEY_PORTTOSADDR(&saidx.src, 5778 sport->sadb_x_nat_t_port_port); 5779 if (dport) 5780 KEY_PORTTOSADDR(&saidx.dst, 5781 dport->sadb_x_nat_t_port_port); 5782 } 5783#endif 5784 5785 SAHTREE_LOCK(); 5786 LIST_FOREACH(sah, &V_sahtree, chain) { 5787 if (sah->state == SADB_SASTATE_DEAD) 5788 continue; 5789 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5790 continue; 5791 5792 /* Delete all non-LARVAL SAs. */ 5793 for (stateidx = 0; 5794 stateidx < _ARRAYLEN(saorder_state_alive); 5795 stateidx++) { 5796 state = saorder_state_alive[stateidx]; 5797 if (state == SADB_SASTATE_LARVAL) 5798 continue; 5799 for (sav = LIST_FIRST(&sah->savtree[state]); 5800 sav != NULL; sav = nextsav) { 5801 nextsav = LIST_NEXT(sav, chain); 5802 /* sanity check */ 5803 if (sav->state != state) { 5804 ipseclog((LOG_DEBUG, "%s: invalid " 5805 "sav->state (queue %d SA %d)\n", 5806 __func__, state, sav->state)); 5807 continue; 5808 } 5809 5810 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5811 KEY_FREESAV(&sav); 5812 } 5813 } 5814 } 5815 SAHTREE_UNLOCK(); 5816 { 5817 struct mbuf *n; 5818 struct sadb_msg *newmsg; 5819 5820 /* create new sadb_msg to reply. */ 5821 /* XXX-BZ NAT-T extensions? */ 5822 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5823 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5824 if (!n) 5825 return key_senderror(so, m, ENOBUFS); 5826 5827 if (n->m_len < sizeof(struct sadb_msg)) { 5828 n = m_pullup(n, sizeof(struct sadb_msg)); 5829 if (n == NULL) 5830 return key_senderror(so, m, ENOBUFS); 5831 } 5832 newmsg = mtod(n, struct sadb_msg *); 5833 newmsg->sadb_msg_errno = 0; 5834 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5835 5836 m_freem(m); 5837 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5838 } 5839} 5840 5841/* 5842 * SADB_GET processing 5843 * receive 5844 * <base, SA(*), address(SD)> 5845 * from the ikmpd, and get a SP and a SA to respond, 5846 * and send, 5847 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5848 * (identity(SD),) (sensitivity)> 5849 * to the ikmpd. 5850 * 5851 * m will always be freed. 5852 */ 5853static int 5854key_get(so, m, mhp) 5855 struct socket *so; 5856 struct mbuf *m; 5857 const struct sadb_msghdr *mhp; 5858{ 5859 struct sadb_sa *sa0; 5860 struct sadb_address *src0, *dst0; 5861 struct secasindex saidx; 5862 struct secashead *sah; 5863 struct secasvar *sav = NULL; 5864 u_int16_t proto; 5865 5866 IPSEC_ASSERT(so != NULL, ("null socket")); 5867 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5868 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5869 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5870 5871 /* map satype to proto */ 5872 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5873 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5874 __func__)); 5875 return key_senderror(so, m, EINVAL); 5876 } 5877 5878 if (mhp->ext[SADB_EXT_SA] == NULL || 5879 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5880 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5881 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5882 __func__)); 5883 return key_senderror(so, m, EINVAL); 5884 } 5885 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5886 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5887 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5888 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5889 __func__)); 5890 return key_senderror(so, m, EINVAL); 5891 } 5892 5893 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5894 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5895 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5896 5897 /* XXX boundary check against sa_len */ 5898 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5899 5900 /* 5901 * Make sure the port numbers are zero. 5902 * In case of NAT-T we will update them later if needed. 5903 */ 5904 KEY_PORTTOSADDR(&saidx.src, 0); 5905 KEY_PORTTOSADDR(&saidx.dst, 0); 5906 5907#ifdef IPSEC_NAT_T 5908 /* 5909 * Handle NAT-T info if present. 5910 */ 5911 5912 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5913 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5914 struct sadb_x_nat_t_port *sport, *dport; 5915 5916 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5917 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5918 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5919 __func__)); 5920 return key_senderror(so, m, EINVAL); 5921 } 5922 5923 sport = (struct sadb_x_nat_t_port *) 5924 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5925 dport = (struct sadb_x_nat_t_port *) 5926 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5927 5928 if (sport) 5929 KEY_PORTTOSADDR(&saidx.src, 5930 sport->sadb_x_nat_t_port_port); 5931 if (dport) 5932 KEY_PORTTOSADDR(&saidx.dst, 5933 dport->sadb_x_nat_t_port_port); 5934 } 5935#endif 5936 5937 /* get a SA header */ 5938 SAHTREE_LOCK(); 5939 LIST_FOREACH(sah, &V_sahtree, chain) { 5940 if (sah->state == SADB_SASTATE_DEAD) 5941 continue; 5942 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5943 continue; 5944 5945 /* get a SA with SPI. */ 5946 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5947 if (sav) 5948 break; 5949 } 5950 SAHTREE_UNLOCK(); 5951 if (sah == NULL) { 5952 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5953 return key_senderror(so, m, ENOENT); 5954 } 5955 5956 { 5957 struct mbuf *n; 5958 u_int8_t satype; 5959 5960 /* map proto to satype */ 5961 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5962 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5963 __func__)); 5964 return key_senderror(so, m, EINVAL); 5965 } 5966 5967 /* create new sadb_msg to reply. */ 5968 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5969 mhp->msg->sadb_msg_pid); 5970 if (!n) 5971 return key_senderror(so, m, ENOBUFS); 5972 5973 m_freem(m); 5974 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5975 } 5976} 5977 5978/* XXX make it sysctl-configurable? */ 5979static void 5980key_getcomb_setlifetime(comb) 5981 struct sadb_comb *comb; 5982{ 5983 5984 comb->sadb_comb_soft_allocations = 1; 5985 comb->sadb_comb_hard_allocations = 1; 5986 comb->sadb_comb_soft_bytes = 0; 5987 comb->sadb_comb_hard_bytes = 0; 5988 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5989 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5990 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5991 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5992} 5993 5994/* 5995 * XXX reorder combinations by preference 5996 * XXX no idea if the user wants ESP authentication or not 5997 */ 5998static struct mbuf * 5999key_getcomb_esp() 6000{ 6001 struct sadb_comb *comb; 6002 struct enc_xform *algo; 6003 struct mbuf *result = NULL, *m, *n; 6004 int encmin; 6005 int i, off, o; 6006 int totlen; 6007 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6008 6009 m = NULL; 6010 for (i = 1; i <= SADB_EALG_MAX; i++) { 6011 algo = esp_algorithm_lookup(i); 6012 if (algo == NULL) 6013 continue; 6014 6015 /* discard algorithms with key size smaller than system min */ 6016 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 6017 continue; 6018 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 6019 encmin = V_ipsec_esp_keymin; 6020 else 6021 encmin = _BITS(algo->minkey); 6022 6023 if (V_ipsec_esp_auth) 6024 m = key_getcomb_ah(); 6025 else { 6026 IPSEC_ASSERT(l <= MLEN, 6027 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6028 MGET(m, M_DONTWAIT, MT_DATA); 6029 if (m) { 6030 M_ALIGN(m, l); 6031 m->m_len = l; 6032 m->m_next = NULL; 6033 bzero(mtod(m, caddr_t), m->m_len); 6034 } 6035 } 6036 if (!m) 6037 goto fail; 6038 6039 totlen = 0; 6040 for (n = m; n; n = n->m_next) 6041 totlen += n->m_len; 6042 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 6043 6044 for (off = 0; off < totlen; off += l) { 6045 n = m_pulldown(m, off, l, &o); 6046 if (!n) { 6047 /* m is already freed */ 6048 goto fail; 6049 } 6050 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 6051 bzero(comb, sizeof(*comb)); 6052 key_getcomb_setlifetime(comb); 6053 comb->sadb_comb_encrypt = i; 6054 comb->sadb_comb_encrypt_minbits = encmin; 6055 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 6056 } 6057 6058 if (!result) 6059 result = m; 6060 else 6061 m_cat(result, m); 6062 } 6063 6064 return result; 6065 6066 fail: 6067 if (result) 6068 m_freem(result); 6069 return NULL; 6070} 6071 6072static void 6073key_getsizes_ah( 6074 const struct auth_hash *ah, 6075 int alg, 6076 u_int16_t* min, 6077 u_int16_t* max) 6078{ 6079 6080 *min = *max = ah->keysize; 6081 if (ah->keysize == 0) { 6082 /* 6083 * Transform takes arbitrary key size but algorithm 6084 * key size is restricted. Enforce this here. 6085 */ 6086 switch (alg) { 6087 case SADB_X_AALG_MD5: *min = *max = 16; break; 6088 case SADB_X_AALG_SHA: *min = *max = 20; break; 6089 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 6090 default: 6091 DPRINTF(("%s: unknown AH algorithm %u\n", 6092 __func__, alg)); 6093 break; 6094 } 6095 } 6096} 6097 6098/* 6099 * XXX reorder combinations by preference 6100 */ 6101static struct mbuf * 6102key_getcomb_ah() 6103{ 6104 struct sadb_comb *comb; 6105 struct auth_hash *algo; 6106 struct mbuf *m; 6107 u_int16_t minkeysize, maxkeysize; 6108 int i; 6109 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6110 6111 m = NULL; 6112 for (i = 1; i <= SADB_AALG_MAX; i++) { 6113#if 1 6114 /* we prefer HMAC algorithms, not old algorithms */ 6115 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 6116 continue; 6117#endif 6118 algo = ah_algorithm_lookup(i); 6119 if (!algo) 6120 continue; 6121 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6122 /* discard algorithms with key size smaller than system min */ 6123 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6124 continue; 6125 6126 if (!m) { 6127 IPSEC_ASSERT(l <= MLEN, 6128 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6129 MGET(m, M_DONTWAIT, MT_DATA); 6130 if (m) { 6131 M_ALIGN(m, l); 6132 m->m_len = l; 6133 m->m_next = NULL; 6134 } 6135 } else 6136 M_PREPEND(m, l, M_DONTWAIT); 6137 if (!m) 6138 return NULL; 6139 6140 comb = mtod(m, struct sadb_comb *); 6141 bzero(comb, sizeof(*comb)); 6142 key_getcomb_setlifetime(comb); 6143 comb->sadb_comb_auth = i; 6144 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6145 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6146 } 6147 6148 return m; 6149} 6150 6151/* 6152 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6153 * XXX reorder combinations by preference 6154 */ 6155static struct mbuf * 6156key_getcomb_ipcomp() 6157{ 6158 struct sadb_comb *comb; 6159 struct comp_algo *algo; 6160 struct mbuf *m; 6161 int i; 6162 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6163 6164 m = NULL; 6165 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6166 algo = ipcomp_algorithm_lookup(i); 6167 if (!algo) 6168 continue; 6169 6170 if (!m) { 6171 IPSEC_ASSERT(l <= MLEN, 6172 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6173 MGET(m, M_DONTWAIT, MT_DATA); 6174 if (m) { 6175 M_ALIGN(m, l); 6176 m->m_len = l; 6177 m->m_next = NULL; 6178 } 6179 } else 6180 M_PREPEND(m, l, M_DONTWAIT); 6181 if (!m) 6182 return NULL; 6183 6184 comb = mtod(m, struct sadb_comb *); 6185 bzero(comb, sizeof(*comb)); 6186 key_getcomb_setlifetime(comb); 6187 comb->sadb_comb_encrypt = i; 6188 /* what should we set into sadb_comb_*_{min,max}bits? */ 6189 } 6190 6191 return m; 6192} 6193 6194/* 6195 * XXX no way to pass mode (transport/tunnel) to userland 6196 * XXX replay checking? 6197 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6198 */ 6199static struct mbuf * 6200key_getprop(saidx) 6201 const struct secasindex *saidx; 6202{ 6203 struct sadb_prop *prop; 6204 struct mbuf *m, *n; 6205 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6206 int totlen; 6207 6208 switch (saidx->proto) { 6209 case IPPROTO_ESP: 6210 m = key_getcomb_esp(); 6211 break; 6212 case IPPROTO_AH: 6213 m = key_getcomb_ah(); 6214 break; 6215 case IPPROTO_IPCOMP: 6216 m = key_getcomb_ipcomp(); 6217 break; 6218 default: 6219 return NULL; 6220 } 6221 6222 if (!m) 6223 return NULL; 6224 M_PREPEND(m, l, M_DONTWAIT); 6225 if (!m) 6226 return NULL; 6227 6228 totlen = 0; 6229 for (n = m; n; n = n->m_next) 6230 totlen += n->m_len; 6231 6232 prop = mtod(m, struct sadb_prop *); 6233 bzero(prop, sizeof(*prop)); 6234 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6235 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6236 prop->sadb_prop_replay = 32; /* XXX */ 6237 6238 return m; 6239} 6240 6241/* 6242 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6243 * send 6244 * <base, SA, address(SD), (address(P)), x_policy, 6245 * (identity(SD),) (sensitivity,) proposal> 6246 * to KMD, and expect to receive 6247 * <base> with SADB_ACQUIRE if error occured, 6248 * or 6249 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6250 * from KMD by PF_KEY. 6251 * 6252 * XXX x_policy is outside of RFC2367 (KAME extension). 6253 * XXX sensitivity is not supported. 6254 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6255 * see comment for key_getcomb_ipcomp(). 6256 * 6257 * OUT: 6258 * 0 : succeed 6259 * others: error number 6260 */ 6261static int 6262key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6263{ 6264 struct mbuf *result = NULL, *m; 6265 struct secacq *newacq; 6266 u_int8_t satype; 6267 int error = -1; 6268 u_int32_t seq; 6269 6270 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6271 satype = key_proto2satype(saidx->proto); 6272 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6273 6274 /* 6275 * We never do anything about acquirng SA. There is anather 6276 * solution that kernel blocks to send SADB_ACQUIRE message until 6277 * getting something message from IKEd. In later case, to be 6278 * managed with ACQUIRING list. 6279 */ 6280 /* Get an entry to check whether sending message or not. */ 6281 if ((newacq = key_getacq(saidx)) != NULL) { 6282 if (V_key_blockacq_count < newacq->count) { 6283 /* reset counter and do send message. */ 6284 newacq->count = 0; 6285 } else { 6286 /* increment counter and do nothing. */ 6287 newacq->count++; 6288 return 0; 6289 } 6290 } else { 6291 /* make new entry for blocking to send SADB_ACQUIRE. */ 6292 if ((newacq = key_newacq(saidx)) == NULL) 6293 return ENOBUFS; 6294 } 6295 6296 6297 seq = newacq->seq; 6298 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6299 if (!m) { 6300 error = ENOBUFS; 6301 goto fail; 6302 } 6303 result = m; 6304 6305 /* 6306 * No SADB_X_EXT_NAT_T_* here: we do not know 6307 * anything related to NAT-T at this time. 6308 */ 6309 6310 /* set sadb_address for saidx's. */ 6311 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6312 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6313 if (!m) { 6314 error = ENOBUFS; 6315 goto fail; 6316 } 6317 m_cat(result, m); 6318 6319 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6320 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6321 if (!m) { 6322 error = ENOBUFS; 6323 goto fail; 6324 } 6325 m_cat(result, m); 6326 6327 /* XXX proxy address (optional) */ 6328 6329 /* set sadb_x_policy */ 6330 if (sp) { 6331 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6332 if (!m) { 6333 error = ENOBUFS; 6334 goto fail; 6335 } 6336 m_cat(result, m); 6337 } 6338 6339 /* XXX identity (optional) */ 6340#if 0 6341 if (idexttype && fqdn) { 6342 /* create identity extension (FQDN) */ 6343 struct sadb_ident *id; 6344 int fqdnlen; 6345 6346 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6347 id = (struct sadb_ident *)p; 6348 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6349 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6350 id->sadb_ident_exttype = idexttype; 6351 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6352 bcopy(fqdn, id + 1, fqdnlen); 6353 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6354 } 6355 6356 if (idexttype) { 6357 /* create identity extension (USERFQDN) */ 6358 struct sadb_ident *id; 6359 int userfqdnlen; 6360 6361 if (userfqdn) { 6362 /* +1 for terminating-NUL */ 6363 userfqdnlen = strlen(userfqdn) + 1; 6364 } else 6365 userfqdnlen = 0; 6366 id = (struct sadb_ident *)p; 6367 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6368 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6369 id->sadb_ident_exttype = idexttype; 6370 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6371 /* XXX is it correct? */ 6372 if (curproc && curproc->p_cred) 6373 id->sadb_ident_id = curproc->p_cred->p_ruid; 6374 if (userfqdn && userfqdnlen) 6375 bcopy(userfqdn, id + 1, userfqdnlen); 6376 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6377 } 6378#endif 6379 6380 /* XXX sensitivity (optional) */ 6381 6382 /* create proposal/combination extension */ 6383 m = key_getprop(saidx); 6384#if 0 6385 /* 6386 * spec conformant: always attach proposal/combination extension, 6387 * the problem is that we have no way to attach it for ipcomp, 6388 * due to the way sadb_comb is declared in RFC2367. 6389 */ 6390 if (!m) { 6391 error = ENOBUFS; 6392 goto fail; 6393 } 6394 m_cat(result, m); 6395#else 6396 /* 6397 * outside of spec; make proposal/combination extension optional. 6398 */ 6399 if (m) 6400 m_cat(result, m); 6401#endif 6402 6403 if ((result->m_flags & M_PKTHDR) == 0) { 6404 error = EINVAL; 6405 goto fail; 6406 } 6407 6408 if (result->m_len < sizeof(struct sadb_msg)) { 6409 result = m_pullup(result, sizeof(struct sadb_msg)); 6410 if (result == NULL) { 6411 error = ENOBUFS; 6412 goto fail; 6413 } 6414 } 6415 6416 result->m_pkthdr.len = 0; 6417 for (m = result; m; m = m->m_next) 6418 result->m_pkthdr.len += m->m_len; 6419 6420 mtod(result, struct sadb_msg *)->sadb_msg_len = 6421 PFKEY_UNIT64(result->m_pkthdr.len); 6422 6423 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6424 6425 fail: 6426 if (result) 6427 m_freem(result); 6428 return error; 6429} 6430 6431static struct secacq * 6432key_newacq(const struct secasindex *saidx) 6433{ 6434 struct secacq *newacq; 6435 6436 /* get new entry */ 6437 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6438 if (newacq == NULL) { 6439 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6440 return NULL; 6441 } 6442 6443 /* copy secindex */ 6444 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6445 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6446 newacq->created = time_second; 6447 newacq->count = 0; 6448 6449 /* add to acqtree */ 6450 ACQ_LOCK(); 6451 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6452 ACQ_UNLOCK(); 6453 6454 return newacq; 6455} 6456 6457static struct secacq * 6458key_getacq(const struct secasindex *saidx) 6459{ 6460 struct secacq *acq; 6461 6462 ACQ_LOCK(); 6463 LIST_FOREACH(acq, &V_acqtree, chain) { 6464 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6465 break; 6466 } 6467 ACQ_UNLOCK(); 6468 6469 return acq; 6470} 6471 6472static struct secacq * 6473key_getacqbyseq(seq) 6474 u_int32_t seq; 6475{ 6476 struct secacq *acq; 6477 6478 ACQ_LOCK(); 6479 LIST_FOREACH(acq, &V_acqtree, chain) { 6480 if (acq->seq == seq) 6481 break; 6482 } 6483 ACQ_UNLOCK(); 6484 6485 return acq; 6486} 6487 6488static struct secspacq * 6489key_newspacq(spidx) 6490 struct secpolicyindex *spidx; 6491{ 6492 struct secspacq *acq; 6493 6494 /* get new entry */ 6495 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6496 if (acq == NULL) { 6497 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6498 return NULL; 6499 } 6500 6501 /* copy secindex */ 6502 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6503 acq->created = time_second; 6504 acq->count = 0; 6505 6506 /* add to spacqtree */ 6507 SPACQ_LOCK(); 6508 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6509 SPACQ_UNLOCK(); 6510 6511 return acq; 6512} 6513 6514static struct secspacq * 6515key_getspacq(spidx) 6516 struct secpolicyindex *spidx; 6517{ 6518 struct secspacq *acq; 6519 6520 SPACQ_LOCK(); 6521 LIST_FOREACH(acq, &V_spacqtree, chain) { 6522 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6523 /* NB: return holding spacq_lock */ 6524 return acq; 6525 } 6526 } 6527 SPACQ_UNLOCK(); 6528 6529 return NULL; 6530} 6531 6532/* 6533 * SADB_ACQUIRE processing, 6534 * in first situation, is receiving 6535 * <base> 6536 * from the ikmpd, and clear sequence of its secasvar entry. 6537 * 6538 * In second situation, is receiving 6539 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6540 * from a user land process, and return 6541 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6542 * to the socket. 6543 * 6544 * m will always be freed. 6545 */ 6546static int 6547key_acquire2(so, m, mhp) 6548 struct socket *so; 6549 struct mbuf *m; 6550 const struct sadb_msghdr *mhp; 6551{ 6552 const struct sadb_address *src0, *dst0; 6553 struct secasindex saidx; 6554 struct secashead *sah; 6555 u_int16_t proto; 6556 int error; 6557 6558 IPSEC_ASSERT(so != NULL, ("null socket")); 6559 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6560 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6561 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6562 6563 /* 6564 * Error message from KMd. 6565 * We assume that if error was occured in IKEd, the length of PFKEY 6566 * message is equal to the size of sadb_msg structure. 6567 * We do not raise error even if error occured in this function. 6568 */ 6569 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6570 struct secacq *acq; 6571 6572 /* check sequence number */ 6573 if (mhp->msg->sadb_msg_seq == 0) { 6574 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6575 "number.\n", __func__)); 6576 m_freem(m); 6577 return 0; 6578 } 6579 6580 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6581 /* 6582 * the specified larval SA is already gone, or we got 6583 * a bogus sequence number. we can silently ignore it. 6584 */ 6585 m_freem(m); 6586 return 0; 6587 } 6588 6589 /* reset acq counter in order to deletion by timehander. */ 6590 acq->created = time_second; 6591 acq->count = 0; 6592 m_freem(m); 6593 return 0; 6594 } 6595 6596 /* 6597 * This message is from user land. 6598 */ 6599 6600 /* map satype to proto */ 6601 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6602 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6603 __func__)); 6604 return key_senderror(so, m, EINVAL); 6605 } 6606 6607 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6608 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6609 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6610 /* error */ 6611 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6612 __func__)); 6613 return key_senderror(so, m, EINVAL); 6614 } 6615 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6616 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6617 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6618 /* error */ 6619 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6620 __func__)); 6621 return key_senderror(so, m, EINVAL); 6622 } 6623 6624 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6625 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6626 6627 /* XXX boundary check against sa_len */ 6628 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6629 6630 /* 6631 * Make sure the port numbers are zero. 6632 * In case of NAT-T we will update them later if needed. 6633 */ 6634 KEY_PORTTOSADDR(&saidx.src, 0); 6635 KEY_PORTTOSADDR(&saidx.dst, 0); 6636 6637#ifndef IPSEC_NAT_T 6638 /* 6639 * Handle NAT-T info if present. 6640 */ 6641 6642 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6643 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6644 struct sadb_x_nat_t_port *sport, *dport; 6645 6646 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6647 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6648 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6649 __func__)); 6650 return key_senderror(so, m, EINVAL); 6651 } 6652 6653 sport = (struct sadb_x_nat_t_port *) 6654 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6655 dport = (struct sadb_x_nat_t_port *) 6656 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6657 6658 if (sport) 6659 KEY_PORTTOSADDR(&saidx.src, 6660 sport->sadb_x_nat_t_port_port); 6661 if (dport) 6662 KEY_PORTTOSADDR(&saidx.dst, 6663 dport->sadb_x_nat_t_port_port); 6664 } 6665#endif 6666 6667 /* get a SA index */ 6668 SAHTREE_LOCK(); 6669 LIST_FOREACH(sah, &V_sahtree, chain) { 6670 if (sah->state == SADB_SASTATE_DEAD) 6671 continue; 6672 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6673 break; 6674 } 6675 SAHTREE_UNLOCK(); 6676 if (sah != NULL) { 6677 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6678 return key_senderror(so, m, EEXIST); 6679 } 6680 6681 error = key_acquire(&saidx, NULL); 6682 if (error != 0) { 6683 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6684 __func__, mhp->msg->sadb_msg_errno)); 6685 return key_senderror(so, m, error); 6686 } 6687 6688 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6689} 6690 6691/* 6692 * SADB_REGISTER processing. 6693 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6694 * receive 6695 * <base> 6696 * from the ikmpd, and register a socket to send PF_KEY messages, 6697 * and send 6698 * <base, supported> 6699 * to KMD by PF_KEY. 6700 * If socket is detached, must free from regnode. 6701 * 6702 * m will always be freed. 6703 */ 6704static int 6705key_register(so, m, mhp) 6706 struct socket *so; 6707 struct mbuf *m; 6708 const struct sadb_msghdr *mhp; 6709{ 6710 struct secreg *reg, *newreg = 0; 6711 6712 IPSEC_ASSERT(so != NULL, ("null socket")); 6713 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6714 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6715 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6716 6717 /* check for invalid register message */ 6718 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6719 return key_senderror(so, m, EINVAL); 6720 6721 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6722 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6723 goto setmsg; 6724 6725 /* check whether existing or not */ 6726 REGTREE_LOCK(); 6727 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6728 if (reg->so == so) { 6729 REGTREE_UNLOCK(); 6730 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6731 __func__)); 6732 return key_senderror(so, m, EEXIST); 6733 } 6734 } 6735 6736 /* create regnode */ 6737 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6738 if (newreg == NULL) { 6739 REGTREE_UNLOCK(); 6740 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6741 return key_senderror(so, m, ENOBUFS); 6742 } 6743 6744 newreg->so = so; 6745 ((struct keycb *)sotorawcb(so))->kp_registered++; 6746 6747 /* add regnode to regtree. */ 6748 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6749 REGTREE_UNLOCK(); 6750 6751 setmsg: 6752 { 6753 struct mbuf *n; 6754 struct sadb_msg *newmsg; 6755 struct sadb_supported *sup; 6756 u_int len, alen, elen; 6757 int off; 6758 int i; 6759 struct sadb_alg *alg; 6760 6761 /* create new sadb_msg to reply. */ 6762 alen = 0; 6763 for (i = 1; i <= SADB_AALG_MAX; i++) { 6764 if (ah_algorithm_lookup(i)) 6765 alen += sizeof(struct sadb_alg); 6766 } 6767 if (alen) 6768 alen += sizeof(struct sadb_supported); 6769 elen = 0; 6770 for (i = 1; i <= SADB_EALG_MAX; i++) { 6771 if (esp_algorithm_lookup(i)) 6772 elen += sizeof(struct sadb_alg); 6773 } 6774 if (elen) 6775 elen += sizeof(struct sadb_supported); 6776 6777 len = sizeof(struct sadb_msg) + alen + elen; 6778 6779 if (len > MCLBYTES) 6780 return key_senderror(so, m, ENOBUFS); 6781 6782 MGETHDR(n, M_DONTWAIT, MT_DATA); 6783 if (len > MHLEN) { 6784 MCLGET(n, M_DONTWAIT); 6785 if ((n->m_flags & M_EXT) == 0) { 6786 m_freem(n); 6787 n = NULL; 6788 } 6789 } 6790 if (!n) 6791 return key_senderror(so, m, ENOBUFS); 6792 6793 n->m_pkthdr.len = n->m_len = len; 6794 n->m_next = NULL; 6795 off = 0; 6796 6797 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6798 newmsg = mtod(n, struct sadb_msg *); 6799 newmsg->sadb_msg_errno = 0; 6800 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6801 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6802 6803 /* for authentication algorithm */ 6804 if (alen) { 6805 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6806 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6807 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6808 off += PFKEY_ALIGN8(sizeof(*sup)); 6809 6810 for (i = 1; i <= SADB_AALG_MAX; i++) { 6811 struct auth_hash *aalgo; 6812 u_int16_t minkeysize, maxkeysize; 6813 6814 aalgo = ah_algorithm_lookup(i); 6815 if (!aalgo) 6816 continue; 6817 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6818 alg->sadb_alg_id = i; 6819 alg->sadb_alg_ivlen = 0; 6820 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6821 alg->sadb_alg_minbits = _BITS(minkeysize); 6822 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6823 off += PFKEY_ALIGN8(sizeof(*alg)); 6824 } 6825 } 6826 6827 /* for encryption algorithm */ 6828 if (elen) { 6829 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6830 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6831 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6832 off += PFKEY_ALIGN8(sizeof(*sup)); 6833 6834 for (i = 1; i <= SADB_EALG_MAX; i++) { 6835 struct enc_xform *ealgo; 6836 6837 ealgo = esp_algorithm_lookup(i); 6838 if (!ealgo) 6839 continue; 6840 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6841 alg->sadb_alg_id = i; 6842 alg->sadb_alg_ivlen = ealgo->blocksize; 6843 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6844 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6845 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6846 } 6847 } 6848 6849 IPSEC_ASSERT(off == len, 6850 ("length assumption failed (off %u len %u)", off, len)); 6851 6852 m_freem(m); 6853 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6854 } 6855} 6856 6857/* 6858 * free secreg entry registered. 6859 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6860 */ 6861void 6862key_freereg(struct socket *so) 6863{ 6864 struct secreg *reg; 6865 int i; 6866 6867 IPSEC_ASSERT(so != NULL, ("NULL so")); 6868 6869 /* 6870 * check whether existing or not. 6871 * check all type of SA, because there is a potential that 6872 * one socket is registered to multiple type of SA. 6873 */ 6874 REGTREE_LOCK(); 6875 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6876 LIST_FOREACH(reg, &V_regtree[i], chain) { 6877 if (reg->so == so && __LIST_CHAINED(reg)) { 6878 LIST_REMOVE(reg, chain); 6879 free(reg, M_IPSEC_SAR); 6880 break; 6881 } 6882 } 6883 } 6884 REGTREE_UNLOCK(); 6885} 6886 6887/* 6888 * SADB_EXPIRE processing 6889 * send 6890 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6891 * to KMD by PF_KEY. 6892 * NOTE: We send only soft lifetime extension. 6893 * 6894 * OUT: 0 : succeed 6895 * others : error number 6896 */ 6897static int 6898key_expire(struct secasvar *sav) 6899{ 6900 int s; 6901 int satype; 6902 struct mbuf *result = NULL, *m; 6903 int len; 6904 int error = -1; 6905 struct sadb_lifetime *lt; 6906 6907 /* XXX: Why do we lock ? */ 6908 s = splnet(); /*called from softclock()*/ 6909 6910 IPSEC_ASSERT (sav != NULL, ("null sav")); 6911 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6912 6913 /* set msg header */ 6914 satype = key_proto2satype(sav->sah->saidx.proto); 6915 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6916 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6917 if (!m) { 6918 error = ENOBUFS; 6919 goto fail; 6920 } 6921 result = m; 6922 6923 /* create SA extension */ 6924 m = key_setsadbsa(sav); 6925 if (!m) { 6926 error = ENOBUFS; 6927 goto fail; 6928 } 6929 m_cat(result, m); 6930 6931 /* create SA extension */ 6932 m = key_setsadbxsa2(sav->sah->saidx.mode, 6933 sav->replay ? sav->replay->count : 0, 6934 sav->sah->saidx.reqid); 6935 if (!m) { 6936 error = ENOBUFS; 6937 goto fail; 6938 } 6939 m_cat(result, m); 6940 6941 /* create lifetime extension (current and soft) */ 6942 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6943 m = key_alloc_mbuf(len); 6944 if (!m || m->m_next) { /*XXX*/ 6945 if (m) 6946 m_freem(m); 6947 error = ENOBUFS; 6948 goto fail; 6949 } 6950 bzero(mtod(m, caddr_t), len); 6951 lt = mtod(m, struct sadb_lifetime *); 6952 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6953 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6954 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6955 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6956 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6957 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6958 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6959 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6960 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6961 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6962 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6963 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6964 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6965 m_cat(result, m); 6966 6967 /* set sadb_address for source */ 6968 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6969 &sav->sah->saidx.src.sa, 6970 FULLMASK, IPSEC_ULPROTO_ANY); 6971 if (!m) { 6972 error = ENOBUFS; 6973 goto fail; 6974 } 6975 m_cat(result, m); 6976 6977 /* set sadb_address for destination */ 6978 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6979 &sav->sah->saidx.dst.sa, 6980 FULLMASK, IPSEC_ULPROTO_ANY); 6981 if (!m) { 6982 error = ENOBUFS; 6983 goto fail; 6984 } 6985 m_cat(result, m); 6986 6987 /* 6988 * XXX-BZ Handle NAT-T extensions here. 6989 */ 6990 6991 if ((result->m_flags & M_PKTHDR) == 0) { 6992 error = EINVAL; 6993 goto fail; 6994 } 6995 6996 if (result->m_len < sizeof(struct sadb_msg)) { 6997 result = m_pullup(result, sizeof(struct sadb_msg)); 6998 if (result == NULL) { 6999 error = ENOBUFS; 7000 goto fail; 7001 } 7002 } 7003 7004 result->m_pkthdr.len = 0; 7005 for (m = result; m; m = m->m_next) 7006 result->m_pkthdr.len += m->m_len; 7007 7008 mtod(result, struct sadb_msg *)->sadb_msg_len = 7009 PFKEY_UNIT64(result->m_pkthdr.len); 7010 7011 splx(s); 7012 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 7013 7014 fail: 7015 if (result) 7016 m_freem(result); 7017 splx(s); 7018 return error; 7019} 7020 7021/* 7022 * SADB_FLUSH processing 7023 * receive 7024 * <base> 7025 * from the ikmpd, and free all entries in secastree. 7026 * and send, 7027 * <base> 7028 * to the ikmpd. 7029 * NOTE: to do is only marking SADB_SASTATE_DEAD. 7030 * 7031 * m will always be freed. 7032 */ 7033static int 7034key_flush(so, m, mhp) 7035 struct socket *so; 7036 struct mbuf *m; 7037 const struct sadb_msghdr *mhp; 7038{ 7039 struct sadb_msg *newmsg; 7040 struct secashead *sah, *nextsah; 7041 struct secasvar *sav, *nextsav; 7042 u_int16_t proto; 7043 u_int8_t state; 7044 u_int stateidx; 7045 7046 IPSEC_ASSERT(so != NULL, ("null socket")); 7047 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7048 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7049 7050 /* map satype to proto */ 7051 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7052 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7053 __func__)); 7054 return key_senderror(so, m, EINVAL); 7055 } 7056 7057 /* no SATYPE specified, i.e. flushing all SA. */ 7058 SAHTREE_LOCK(); 7059 for (sah = LIST_FIRST(&V_sahtree); 7060 sah != NULL; 7061 sah = nextsah) { 7062 nextsah = LIST_NEXT(sah, chain); 7063 7064 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7065 && proto != sah->saidx.proto) 7066 continue; 7067 7068 for (stateidx = 0; 7069 stateidx < _ARRAYLEN(saorder_state_alive); 7070 stateidx++) { 7071 state = saorder_state_any[stateidx]; 7072 for (sav = LIST_FIRST(&sah->savtree[state]); 7073 sav != NULL; 7074 sav = nextsav) { 7075 7076 nextsav = LIST_NEXT(sav, chain); 7077 7078 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 7079 KEY_FREESAV(&sav); 7080 } 7081 } 7082 7083 sah->state = SADB_SASTATE_DEAD; 7084 } 7085 SAHTREE_UNLOCK(); 7086 7087 if (m->m_len < sizeof(struct sadb_msg) || 7088 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 7089 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 7090 return key_senderror(so, m, ENOBUFS); 7091 } 7092 7093 if (m->m_next) 7094 m_freem(m->m_next); 7095 m->m_next = NULL; 7096 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 7097 newmsg = mtod(m, struct sadb_msg *); 7098 newmsg->sadb_msg_errno = 0; 7099 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 7100 7101 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7102} 7103 7104/* 7105 * SADB_DUMP processing 7106 * dump all entries including status of DEAD in SAD. 7107 * receive 7108 * <base> 7109 * from the ikmpd, and dump all secasvar leaves 7110 * and send, 7111 * <base> ..... 7112 * to the ikmpd. 7113 * 7114 * m will always be freed. 7115 */ 7116static int 7117key_dump(so, m, mhp) 7118 struct socket *so; 7119 struct mbuf *m; 7120 const struct sadb_msghdr *mhp; 7121{ 7122 struct secashead *sah; 7123 struct secasvar *sav; 7124 u_int16_t proto; 7125 u_int stateidx; 7126 u_int8_t satype; 7127 u_int8_t state; 7128 int cnt; 7129 struct sadb_msg *newmsg; 7130 struct mbuf *n; 7131 7132 IPSEC_ASSERT(so != NULL, ("null socket")); 7133 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7134 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7135 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7136 7137 /* map satype to proto */ 7138 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7139 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7140 __func__)); 7141 return key_senderror(so, m, EINVAL); 7142 } 7143 7144 /* count sav entries to be sent to the userland. */ 7145 cnt = 0; 7146 SAHTREE_LOCK(); 7147 LIST_FOREACH(sah, &V_sahtree, chain) { 7148 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7149 && proto != sah->saidx.proto) 7150 continue; 7151 7152 for (stateidx = 0; 7153 stateidx < _ARRAYLEN(saorder_state_any); 7154 stateidx++) { 7155 state = saorder_state_any[stateidx]; 7156 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7157 cnt++; 7158 } 7159 } 7160 } 7161 7162 if (cnt == 0) { 7163 SAHTREE_UNLOCK(); 7164 return key_senderror(so, m, ENOENT); 7165 } 7166 7167 /* send this to the userland, one at a time. */ 7168 newmsg = NULL; 7169 LIST_FOREACH(sah, &V_sahtree, chain) { 7170 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7171 && proto != sah->saidx.proto) 7172 continue; 7173 7174 /* map proto to satype */ 7175 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7176 SAHTREE_UNLOCK(); 7177 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7178 "SAD.\n", __func__)); 7179 return key_senderror(so, m, EINVAL); 7180 } 7181 7182 for (stateidx = 0; 7183 stateidx < _ARRAYLEN(saorder_state_any); 7184 stateidx++) { 7185 state = saorder_state_any[stateidx]; 7186 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7187 n = key_setdumpsa(sav, SADB_DUMP, satype, 7188 --cnt, mhp->msg->sadb_msg_pid); 7189 if (!n) { 7190 SAHTREE_UNLOCK(); 7191 return key_senderror(so, m, ENOBUFS); 7192 } 7193 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7194 } 7195 } 7196 } 7197 SAHTREE_UNLOCK(); 7198 7199 m_freem(m); 7200 return 0; 7201} 7202 7203/* 7204 * SADB_X_PROMISC processing 7205 * 7206 * m will always be freed. 7207 */ 7208static int 7209key_promisc(so, m, mhp) 7210 struct socket *so; 7211 struct mbuf *m; 7212 const struct sadb_msghdr *mhp; 7213{ 7214 int olen; 7215 7216 IPSEC_ASSERT(so != NULL, ("null socket")); 7217 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7218 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7219 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7220 7221 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7222 7223 if (olen < sizeof(struct sadb_msg)) { 7224#if 1 7225 return key_senderror(so, m, EINVAL); 7226#else 7227 m_freem(m); 7228 return 0; 7229#endif 7230 } else if (olen == sizeof(struct sadb_msg)) { 7231 /* enable/disable promisc mode */ 7232 struct keycb *kp; 7233 7234 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7235 return key_senderror(so, m, EINVAL); 7236 mhp->msg->sadb_msg_errno = 0; 7237 switch (mhp->msg->sadb_msg_satype) { 7238 case 0: 7239 case 1: 7240 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7241 break; 7242 default: 7243 return key_senderror(so, m, EINVAL); 7244 } 7245 7246 /* send the original message back to everyone */ 7247 mhp->msg->sadb_msg_errno = 0; 7248 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7249 } else { 7250 /* send packet as is */ 7251 7252 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7253 7254 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7255 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7256 } 7257} 7258 7259static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 7260 const struct sadb_msghdr *)) = { 7261 NULL, /* SADB_RESERVED */ 7262 key_getspi, /* SADB_GETSPI */ 7263 key_update, /* SADB_UPDATE */ 7264 key_add, /* SADB_ADD */ 7265 key_delete, /* SADB_DELETE */ 7266 key_get, /* SADB_GET */ 7267 key_acquire2, /* SADB_ACQUIRE */ 7268 key_register, /* SADB_REGISTER */ 7269 NULL, /* SADB_EXPIRE */ 7270 key_flush, /* SADB_FLUSH */ 7271 key_dump, /* SADB_DUMP */ 7272 key_promisc, /* SADB_X_PROMISC */ 7273 NULL, /* SADB_X_PCHANGE */ 7274 key_spdadd, /* SADB_X_SPDUPDATE */ 7275 key_spdadd, /* SADB_X_SPDADD */ 7276 key_spddelete, /* SADB_X_SPDDELETE */ 7277 key_spdget, /* SADB_X_SPDGET */ 7278 NULL, /* SADB_X_SPDACQUIRE */ 7279 key_spddump, /* SADB_X_SPDDUMP */ 7280 key_spdflush, /* SADB_X_SPDFLUSH */ 7281 key_spdadd, /* SADB_X_SPDSETIDX */ 7282 NULL, /* SADB_X_SPDEXPIRE */ 7283 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7284}; 7285 7286/* 7287 * parse sadb_msg buffer to process PFKEYv2, 7288 * and create a data to response if needed. 7289 * I think to be dealed with mbuf directly. 7290 * IN: 7291 * msgp : pointer to pointer to a received buffer pulluped. 7292 * This is rewrited to response. 7293 * so : pointer to socket. 7294 * OUT: 7295 * length for buffer to send to user process. 7296 */ 7297int 7298key_parse(m, so) 7299 struct mbuf *m; 7300 struct socket *so; 7301{ 7302 struct sadb_msg *msg; 7303 struct sadb_msghdr mh; 7304 u_int orglen; 7305 int error; 7306 int target; 7307 7308 IPSEC_ASSERT(so != NULL, ("null socket")); 7309 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7310 7311#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7312 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7313 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7314 kdebug_sadb(msg)); 7315#endif 7316 7317 if (m->m_len < sizeof(struct sadb_msg)) { 7318 m = m_pullup(m, sizeof(struct sadb_msg)); 7319 if (!m) 7320 return ENOBUFS; 7321 } 7322 msg = mtod(m, struct sadb_msg *); 7323 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7324 target = KEY_SENDUP_ONE; 7325 7326 if ((m->m_flags & M_PKTHDR) == 0 || 7327 m->m_pkthdr.len != m->m_pkthdr.len) { 7328 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7329 V_pfkeystat.out_invlen++; 7330 error = EINVAL; 7331 goto senderror; 7332 } 7333 7334 if (msg->sadb_msg_version != PF_KEY_V2) { 7335 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7336 __func__, msg->sadb_msg_version)); 7337 V_pfkeystat.out_invver++; 7338 error = EINVAL; 7339 goto senderror; 7340 } 7341 7342 if (msg->sadb_msg_type > SADB_MAX) { 7343 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7344 __func__, msg->sadb_msg_type)); 7345 V_pfkeystat.out_invmsgtype++; 7346 error = EINVAL; 7347 goto senderror; 7348 } 7349 7350 /* for old-fashioned code - should be nuked */ 7351 if (m->m_pkthdr.len > MCLBYTES) { 7352 m_freem(m); 7353 return ENOBUFS; 7354 } 7355 if (m->m_next) { 7356 struct mbuf *n; 7357 7358 MGETHDR(n, M_DONTWAIT, MT_DATA); 7359 if (n && m->m_pkthdr.len > MHLEN) { 7360 MCLGET(n, M_DONTWAIT); 7361 if ((n->m_flags & M_EXT) == 0) { 7362 m_free(n); 7363 n = NULL; 7364 } 7365 } 7366 if (!n) { 7367 m_freem(m); 7368 return ENOBUFS; 7369 } 7370 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7371 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7372 n->m_next = NULL; 7373 m_freem(m); 7374 m = n; 7375 } 7376 7377 /* align the mbuf chain so that extensions are in contiguous region. */ 7378 error = key_align(m, &mh); 7379 if (error) 7380 return error; 7381 7382 msg = mh.msg; 7383 7384 /* check SA type */ 7385 switch (msg->sadb_msg_satype) { 7386 case SADB_SATYPE_UNSPEC: 7387 switch (msg->sadb_msg_type) { 7388 case SADB_GETSPI: 7389 case SADB_UPDATE: 7390 case SADB_ADD: 7391 case SADB_DELETE: 7392 case SADB_GET: 7393 case SADB_ACQUIRE: 7394 case SADB_EXPIRE: 7395 ipseclog((LOG_DEBUG, "%s: must specify satype " 7396 "when msg type=%u.\n", __func__, 7397 msg->sadb_msg_type)); 7398 V_pfkeystat.out_invsatype++; 7399 error = EINVAL; 7400 goto senderror; 7401 } 7402 break; 7403 case SADB_SATYPE_AH: 7404 case SADB_SATYPE_ESP: 7405 case SADB_X_SATYPE_IPCOMP: 7406 case SADB_X_SATYPE_TCPSIGNATURE: 7407 switch (msg->sadb_msg_type) { 7408 case SADB_X_SPDADD: 7409 case SADB_X_SPDDELETE: 7410 case SADB_X_SPDGET: 7411 case SADB_X_SPDDUMP: 7412 case SADB_X_SPDFLUSH: 7413 case SADB_X_SPDSETIDX: 7414 case SADB_X_SPDUPDATE: 7415 case SADB_X_SPDDELETE2: 7416 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7417 __func__, msg->sadb_msg_type)); 7418 V_pfkeystat.out_invsatype++; 7419 error = EINVAL; 7420 goto senderror; 7421 } 7422 break; 7423 case SADB_SATYPE_RSVP: 7424 case SADB_SATYPE_OSPFV2: 7425 case SADB_SATYPE_RIPV2: 7426 case SADB_SATYPE_MIP: 7427 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7428 __func__, msg->sadb_msg_satype)); 7429 V_pfkeystat.out_invsatype++; 7430 error = EOPNOTSUPP; 7431 goto senderror; 7432 case 1: /* XXX: What does it do? */ 7433 if (msg->sadb_msg_type == SADB_X_PROMISC) 7434 break; 7435 /*FALLTHROUGH*/ 7436 default: 7437 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7438 __func__, msg->sadb_msg_satype)); 7439 V_pfkeystat.out_invsatype++; 7440 error = EINVAL; 7441 goto senderror; 7442 } 7443 7444 /* check field of upper layer protocol and address family */ 7445 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7446 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7447 struct sadb_address *src0, *dst0; 7448 u_int plen; 7449 7450 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7451 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7452 7453 /* check upper layer protocol */ 7454 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7455 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7456 "mismatched.\n", __func__)); 7457 V_pfkeystat.out_invaddr++; 7458 error = EINVAL; 7459 goto senderror; 7460 } 7461 7462 /* check family */ 7463 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7464 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7465 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7466 __func__)); 7467 V_pfkeystat.out_invaddr++; 7468 error = EINVAL; 7469 goto senderror; 7470 } 7471 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7472 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7473 ipseclog((LOG_DEBUG, "%s: address struct size " 7474 "mismatched.\n", __func__)); 7475 V_pfkeystat.out_invaddr++; 7476 error = EINVAL; 7477 goto senderror; 7478 } 7479 7480 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7481 case AF_INET: 7482 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7483 sizeof(struct sockaddr_in)) { 7484 V_pfkeystat.out_invaddr++; 7485 error = EINVAL; 7486 goto senderror; 7487 } 7488 break; 7489 case AF_INET6: 7490 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7491 sizeof(struct sockaddr_in6)) { 7492 V_pfkeystat.out_invaddr++; 7493 error = EINVAL; 7494 goto senderror; 7495 } 7496 break; 7497 default: 7498 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7499 __func__)); 7500 V_pfkeystat.out_invaddr++; 7501 error = EAFNOSUPPORT; 7502 goto senderror; 7503 } 7504 7505 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7506 case AF_INET: 7507 plen = sizeof(struct in_addr) << 3; 7508 break; 7509 case AF_INET6: 7510 plen = sizeof(struct in6_addr) << 3; 7511 break; 7512 default: 7513 plen = 0; /*fool gcc*/ 7514 break; 7515 } 7516 7517 /* check max prefix length */ 7518 if (src0->sadb_address_prefixlen > plen || 7519 dst0->sadb_address_prefixlen > plen) { 7520 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7521 __func__)); 7522 V_pfkeystat.out_invaddr++; 7523 error = EINVAL; 7524 goto senderror; 7525 } 7526 7527 /* 7528 * prefixlen == 0 is valid because there can be a case when 7529 * all addresses are matched. 7530 */ 7531 } 7532 7533 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7534 key_typesw[msg->sadb_msg_type] == NULL) { 7535 V_pfkeystat.out_invmsgtype++; 7536 error = EINVAL; 7537 goto senderror; 7538 } 7539 7540 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7541 7542senderror: 7543 msg->sadb_msg_errno = error; 7544 return key_sendup_mbuf(so, m, target); 7545} 7546 7547static int 7548key_senderror(so, m, code) 7549 struct socket *so; 7550 struct mbuf *m; 7551 int code; 7552{ 7553 struct sadb_msg *msg; 7554 7555 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7556 ("mbuf too small, len %u", m->m_len)); 7557 7558 msg = mtod(m, struct sadb_msg *); 7559 msg->sadb_msg_errno = code; 7560 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7561} 7562 7563/* 7564 * set the pointer to each header into message buffer. 7565 * m will be freed on error. 7566 * XXX larger-than-MCLBYTES extension? 7567 */ 7568static int 7569key_align(m, mhp) 7570 struct mbuf *m; 7571 struct sadb_msghdr *mhp; 7572{ 7573 struct mbuf *n; 7574 struct sadb_ext *ext; 7575 size_t off, end; 7576 int extlen; 7577 int toff; 7578 7579 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7580 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7581 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7582 ("mbuf too small, len %u", m->m_len)); 7583 7584 /* initialize */ 7585 bzero(mhp, sizeof(*mhp)); 7586 7587 mhp->msg = mtod(m, struct sadb_msg *); 7588 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7589 7590 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7591 extlen = end; /*just in case extlen is not updated*/ 7592 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7593 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7594 if (!n) { 7595 /* m is already freed */ 7596 return ENOBUFS; 7597 } 7598 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7599 7600 /* set pointer */ 7601 switch (ext->sadb_ext_type) { 7602 case SADB_EXT_SA: 7603 case SADB_EXT_ADDRESS_SRC: 7604 case SADB_EXT_ADDRESS_DST: 7605 case SADB_EXT_ADDRESS_PROXY: 7606 case SADB_EXT_LIFETIME_CURRENT: 7607 case SADB_EXT_LIFETIME_HARD: 7608 case SADB_EXT_LIFETIME_SOFT: 7609 case SADB_EXT_KEY_AUTH: 7610 case SADB_EXT_KEY_ENCRYPT: 7611 case SADB_EXT_IDENTITY_SRC: 7612 case SADB_EXT_IDENTITY_DST: 7613 case SADB_EXT_SENSITIVITY: 7614 case SADB_EXT_PROPOSAL: 7615 case SADB_EXT_SUPPORTED_AUTH: 7616 case SADB_EXT_SUPPORTED_ENCRYPT: 7617 case SADB_EXT_SPIRANGE: 7618 case SADB_X_EXT_POLICY: 7619 case SADB_X_EXT_SA2: 7620#ifdef IPSEC_NAT_T 7621 case SADB_X_EXT_NAT_T_TYPE: 7622 case SADB_X_EXT_NAT_T_SPORT: 7623 case SADB_X_EXT_NAT_T_DPORT: 7624 case SADB_X_EXT_NAT_T_OAI: 7625 case SADB_X_EXT_NAT_T_OAR: 7626 case SADB_X_EXT_NAT_T_FRAG: 7627#endif 7628 /* duplicate check */ 7629 /* 7630 * XXX Are there duplication payloads of either 7631 * KEY_AUTH or KEY_ENCRYPT ? 7632 */ 7633 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7634 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7635 "%u\n", __func__, ext->sadb_ext_type)); 7636 m_freem(m); 7637 V_pfkeystat.out_dupext++; 7638 return EINVAL; 7639 } 7640 break; 7641 default: 7642 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7643 __func__, ext->sadb_ext_type)); 7644 m_freem(m); 7645 V_pfkeystat.out_invexttype++; 7646 return EINVAL; 7647 } 7648 7649 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7650 7651 if (key_validate_ext(ext, extlen)) { 7652 m_freem(m); 7653 V_pfkeystat.out_invlen++; 7654 return EINVAL; 7655 } 7656 7657 n = m_pulldown(m, off, extlen, &toff); 7658 if (!n) { 7659 /* m is already freed */ 7660 return ENOBUFS; 7661 } 7662 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7663 7664 mhp->ext[ext->sadb_ext_type] = ext; 7665 mhp->extoff[ext->sadb_ext_type] = off; 7666 mhp->extlen[ext->sadb_ext_type] = extlen; 7667 } 7668 7669 if (off != end) { 7670 m_freem(m); 7671 V_pfkeystat.out_invlen++; 7672 return EINVAL; 7673 } 7674 7675 return 0; 7676} 7677 7678static int 7679key_validate_ext(ext, len) 7680 const struct sadb_ext *ext; 7681 int len; 7682{ 7683 const struct sockaddr *sa; 7684 enum { NONE, ADDR } checktype = NONE; 7685 int baselen = 0; 7686 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7687 7688 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7689 return EINVAL; 7690 7691 /* if it does not match minimum/maximum length, bail */ 7692 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7693 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7694 return EINVAL; 7695 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7696 return EINVAL; 7697 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7698 return EINVAL; 7699 7700 /* more checks based on sadb_ext_type XXX need more */ 7701 switch (ext->sadb_ext_type) { 7702 case SADB_EXT_ADDRESS_SRC: 7703 case SADB_EXT_ADDRESS_DST: 7704 case SADB_EXT_ADDRESS_PROXY: 7705 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7706 checktype = ADDR; 7707 break; 7708 case SADB_EXT_IDENTITY_SRC: 7709 case SADB_EXT_IDENTITY_DST: 7710 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7711 SADB_X_IDENTTYPE_ADDR) { 7712 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7713 checktype = ADDR; 7714 } else 7715 checktype = NONE; 7716 break; 7717 default: 7718 checktype = NONE; 7719 break; 7720 } 7721 7722 switch (checktype) { 7723 case NONE: 7724 break; 7725 case ADDR: 7726 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7727 if (len < baselen + sal) 7728 return EINVAL; 7729 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7730 return EINVAL; 7731 break; 7732 } 7733 7734 return 0; 7735} 7736 7737void 7738key_init(void) 7739{ 7740 int i; 7741 7742 for (i = 0; i < IPSEC_DIR_MAX; i++) 7743 LIST_INIT(&V_sptree[i]); 7744 7745 LIST_INIT(&V_sahtree); 7746 7747 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7748 LIST_INIT(&V_regtree[i]); 7749 7750 LIST_INIT(&V_acqtree); 7751 LIST_INIT(&V_spacqtree); 7752 7753 /* system default */ 7754 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7755 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7756 7757 if (!IS_DEFAULT_VNET(curvnet)) 7758 return; 7759 7760 SPTREE_LOCK_INIT(); 7761 REGTREE_LOCK_INIT(); 7762 SAHTREE_LOCK_INIT(); 7763 ACQ_LOCK_INIT(); 7764 SPACQ_LOCK_INIT(); 7765 7766#ifndef IPSEC_DEBUG2 7767 timeout((void *)key_timehandler, (void *)0, hz); 7768#endif /*IPSEC_DEBUG2*/ 7769 7770 /* initialize key statistics */ 7771 keystat.getspi_count = 1; 7772 7773 printf("IPsec: Initialized Security Association Processing.\n"); 7774} 7775 7776#ifdef VIMAGE 7777void 7778key_destroy(void) 7779{ 7780 struct secpolicy *sp, *nextsp; 7781 struct secspacq *acq, *nextacq; 7782 struct secashead *sah, *nextsah; 7783 struct secreg *reg; 7784 int i; 7785 7786 SPTREE_LOCK(); 7787 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7788 for (sp = LIST_FIRST(&V_sptree[i]); 7789 sp != NULL; sp = nextsp) { 7790 nextsp = LIST_NEXT(sp, chain); 7791 if (__LIST_CHAINED(sp)) { 7792 LIST_REMOVE(sp, chain); 7793 free(sp, M_IPSEC_SP); 7794 } 7795 } 7796 } 7797 SPTREE_UNLOCK(); 7798 7799 SAHTREE_LOCK(); 7800 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7801 nextsah = LIST_NEXT(sah, chain); 7802 if (__LIST_CHAINED(sah)) { 7803 LIST_REMOVE(sah, chain); 7804 free(sah, M_IPSEC_SAH); 7805 } 7806 } 7807 SAHTREE_UNLOCK(); 7808 7809 REGTREE_LOCK(); 7810 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7811 LIST_FOREACH(reg, &V_regtree[i], chain) { 7812 if (__LIST_CHAINED(reg)) { 7813 LIST_REMOVE(reg, chain); 7814 free(reg, M_IPSEC_SAR); 7815 break; 7816 } 7817 } 7818 } 7819 REGTREE_UNLOCK(); 7820 7821 ACQ_LOCK(); 7822 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7823 nextacq = LIST_NEXT(acq, chain); 7824 if (__LIST_CHAINED(acq)) { 7825 LIST_REMOVE(acq, chain); 7826 free(acq, M_IPSEC_SAQ); 7827 } 7828 } 7829 ACQ_UNLOCK(); 7830 7831 SPACQ_LOCK(); 7832 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7833 nextacq = LIST_NEXT(acq, chain); 7834 if (__LIST_CHAINED(acq)) { 7835 LIST_REMOVE(acq, chain); 7836 free(acq, M_IPSEC_SAQ); 7837 } 7838 } 7839 SPACQ_UNLOCK(); 7840} 7841#endif 7842 7843/* 7844 * XXX: maybe This function is called after INBOUND IPsec processing. 7845 * 7846 * Special check for tunnel-mode packets. 7847 * We must make some checks for consistency between inner and outer IP header. 7848 * 7849 * xxx more checks to be provided 7850 */ 7851int 7852key_checktunnelsanity(sav, family, src, dst) 7853 struct secasvar *sav; 7854 u_int family; 7855 caddr_t src; 7856 caddr_t dst; 7857{ 7858 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7859 7860 /* XXX: check inner IP header */ 7861 7862 return 1; 7863} 7864 7865/* record data transfer on SA, and update timestamps */ 7866void 7867key_sa_recordxfer(sav, m) 7868 struct secasvar *sav; 7869 struct mbuf *m; 7870{ 7871 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7872 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7873 if (!sav->lft_c) 7874 return; 7875 7876 /* 7877 * XXX Currently, there is a difference of bytes size 7878 * between inbound and outbound processing. 7879 */ 7880 sav->lft_c->bytes += m->m_pkthdr.len; 7881 /* to check bytes lifetime is done in key_timehandler(). */ 7882 7883 /* 7884 * We use the number of packets as the unit of 7885 * allocations. We increment the variable 7886 * whenever {esp,ah}_{in,out}put is called. 7887 */ 7888 sav->lft_c->allocations++; 7889 /* XXX check for expires? */ 7890 7891 /* 7892 * NOTE: We record CURRENT usetime by using wall clock, 7893 * in seconds. HARD and SOFT lifetime are measured by the time 7894 * difference (again in seconds) from usetime. 7895 * 7896 * usetime 7897 * v expire expire 7898 * -----+-----+--------+---> t 7899 * <--------------> HARD 7900 * <-----> SOFT 7901 */ 7902 sav->lft_c->usetime = time_second; 7903 /* XXX check for expires? */ 7904 7905 return; 7906} 7907 7908/* dumb version */ 7909void 7910key_sa_routechange(dst) 7911 struct sockaddr *dst; 7912{ 7913 struct secashead *sah; 7914 struct route *ro; 7915 7916 SAHTREE_LOCK(); 7917 LIST_FOREACH(sah, &V_sahtree, chain) { 7918 ro = &sah->sa_route; 7919 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7920 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7921 RTFREE(ro->ro_rt); 7922 ro->ro_rt = (struct rtentry *)NULL; 7923 } 7924 } 7925 SAHTREE_UNLOCK(); 7926} 7927 7928static void 7929key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7930{ 7931 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7932 SAHTREE_LOCK_ASSERT(); 7933 7934 if (sav->state != state) { 7935 if (__LIST_CHAINED(sav)) 7936 LIST_REMOVE(sav, chain); 7937 sav->state = state; 7938 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7939 } 7940} 7941 7942void 7943key_sa_stir_iv(sav) 7944 struct secasvar *sav; 7945{ 7946 7947 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7948 key_randomfill(sav->iv, sav->ivlen); 7949} 7950 7951/* XXX too much? */ 7952static struct mbuf * 7953key_alloc_mbuf(l) 7954 int l; 7955{ 7956 struct mbuf *m = NULL, *n; 7957 int len, t; 7958 7959 len = l; 7960 while (len > 0) { 7961 MGET(n, M_DONTWAIT, MT_DATA); 7962 if (n && len > MLEN) 7963 MCLGET(n, M_DONTWAIT); 7964 if (!n) { 7965 m_freem(m); 7966 return NULL; 7967 } 7968 7969 n->m_next = NULL; 7970 n->m_len = 0; 7971 n->m_len = M_TRAILINGSPACE(n); 7972 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7973 if (n->m_len > len) { 7974 t = (n->m_len - len) & ~(sizeof(long) - 1); 7975 n->m_data += t; 7976 n->m_len = len; 7977 } 7978 7979 len -= n->m_len; 7980 7981 if (m) 7982 m_cat(m, n); 7983 else 7984 m = n; 7985 } 7986 7987 return m; 7988} 7989 7990/* 7991 * Take one of the kernel's security keys and convert it into a PF_KEY 7992 * structure within an mbuf, suitable for sending up to a waiting 7993 * application in user land. 7994 * 7995 * IN: 7996 * src: A pointer to a kernel security key. 7997 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7998 * OUT: 7999 * a valid mbuf or NULL indicating an error 8000 * 8001 */ 8002 8003static struct mbuf * 8004key_setkey(struct seckey *src, u_int16_t exttype) 8005{ 8006 struct mbuf *m; 8007 struct sadb_key *p; 8008 int len; 8009 8010 if (src == NULL) 8011 return NULL; 8012 8013 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 8014 m = key_alloc_mbuf(len); 8015 if (m == NULL) 8016 return NULL; 8017 p = mtod(m, struct sadb_key *); 8018 bzero(p, len); 8019 p->sadb_key_len = PFKEY_UNIT64(len); 8020 p->sadb_key_exttype = exttype; 8021 p->sadb_key_bits = src->bits; 8022 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 8023 8024 return m; 8025} 8026 8027/* 8028 * Take one of the kernel's lifetime data structures and convert it 8029 * into a PF_KEY structure within an mbuf, suitable for sending up to 8030 * a waiting application in user land. 8031 * 8032 * IN: 8033 * src: A pointer to a kernel lifetime structure. 8034 * exttype: Which type of lifetime this is. Refer to the PF_KEY 8035 * data structures for more information. 8036 * OUT: 8037 * a valid mbuf or NULL indicating an error 8038 * 8039 */ 8040 8041static struct mbuf * 8042key_setlifetime(struct seclifetime *src, u_int16_t exttype) 8043{ 8044 struct mbuf *m = NULL; 8045 struct sadb_lifetime *p; 8046 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 8047 8048 if (src == NULL) 8049 return NULL; 8050 8051 m = key_alloc_mbuf(len); 8052 if (m == NULL) 8053 return m; 8054 p = mtod(m, struct sadb_lifetime *); 8055 8056 bzero(p, len); 8057 p->sadb_lifetime_len = PFKEY_UNIT64(len); 8058 p->sadb_lifetime_exttype = exttype; 8059 p->sadb_lifetime_allocations = src->allocations; 8060 p->sadb_lifetime_bytes = src->bytes; 8061 p->sadb_lifetime_addtime = src->addtime; 8062 p->sadb_lifetime_usetime = src->usetime; 8063 8064 return m; 8065 8066} 8067