Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netipsec/key.c
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1 /* $FreeBSD$ */ 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/raw_cb.h> 62 #include <net/vnet.h> 63 64 #include <netinet/in.h> 65 #include <netinet/in_systm.h> 66 #include <netinet/ip.h> 67 #include <netinet/in_var.h> 68 69 #ifdef INET6 70 #include <netinet/ip6.h> 71 #include <netinet6/in6_var.h> 72 #include <netinet6/ip6_var.h> 73 #endif /* INET6 */ 74 75 #if defined(INET) || defined(INET6) 76 #include <netinet/in_pcb.h> 77 #endif 78 #ifdef INET6 79 #include <netinet6/in6_pcb.h> 80 #endif /* INET6 */ 81 82 #include <net/pfkeyv2.h> 83 #include <netipsec/keydb.h> 84 #include <netipsec/key.h> 85 #include <netipsec/keysock.h> 86 #include <netipsec/key_debug.h> 87 88 #include <netipsec/ipsec.h> 89 #ifdef INET6 90 #include <netipsec/ipsec6.h> 91 #endif 92 93 #include <netipsec/xform.h> 94 95 #include <machine/stdarg.h> 96 97 /* randomness */ 98 #include <sys/random.h> 99 100 #define FULLMASK 0xff 101 #define _BITS(bytes) ((bytes) << 3) 102 103 /* 104 * Note on SA reference counting: 105 * - SAs that are not in DEAD state will have (total external reference + 1) 106 * following value in reference count field. they cannot be freed and are 107 * referenced from SA header. 108 * - SAs that are in DEAD state will have (total external reference) 109 * in reference count field. they are ready to be freed. reference from 110 * SA header will be removed in key_delsav(), when the reference count 111 * field hits 0 (= no external reference other than from SA header. 112 */ 113 114 VNET_DEFINE(u_int32_t, key_debug_level) = 0; 115 static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 116 static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 117 static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 118 static VNET_DEFINE(u_int32_t, policy_id) = 0; 119 /*interval to initialize randseed,1(m)*/ 120 static VNET_DEFINE(u_int, key_int_random) = 60; 121 /* interval to expire acquiring, 30(s)*/ 122 static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 123 /* counter for blocking SADB_ACQUIRE.*/ 124 static VNET_DEFINE(int, key_blockacq_count) = 10; 125 /* lifetime for blocking SADB_ACQUIRE.*/ 126 static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 127 /* preferred old sa rather than new sa.*/ 128 static VNET_DEFINE(int, key_preferred_oldsa) = 1; 129 #define V_key_spi_trycnt VNET(key_spi_trycnt) 130 #define V_key_spi_minval VNET(key_spi_minval) 131 #define V_key_spi_maxval VNET(key_spi_maxval) 132 #define V_policy_id VNET(policy_id) 133 #define V_key_int_random VNET(key_int_random) 134 #define V_key_larval_lifetime VNET(key_larval_lifetime) 135 #define V_key_blockacq_count VNET(key_blockacq_count) 136 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 137 #define V_key_preferred_oldsa VNET(key_preferred_oldsa) 138 139 static VNET_DEFINE(u_int32_t, acq_seq) = 0; 140 #define V_acq_seq VNET(acq_seq) 141 142 /* SPD */ 143 static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 144 #define V_sptree VNET(sptree) 145 static struct mtx sptree_lock; 146 #define SPTREE_LOCK_INIT() \ 147 mtx_init(&sptree_lock, "sptree", \ 148 "fast ipsec security policy database", MTX_DEF) 149 #define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 150 #define SPTREE_LOCK() mtx_lock(&sptree_lock) 151 #define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 152 #define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 153 154 static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 155 #define V_sahtree VNET(sahtree) 156 static struct mtx sahtree_lock; 157 #define SAHTREE_LOCK_INIT() \ 158 mtx_init(&sahtree_lock, "sahtree", \ 159 "fast ipsec security association database", MTX_DEF) 160 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 161 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 162 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 163 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 164 165 /* registed list */ 166 static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 167 #define V_regtree VNET(regtree) 168 static struct mtx regtree_lock; 169 #define REGTREE_LOCK_INIT() \ 170 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 171 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 172 #define REGTREE_LOCK() mtx_lock(®tree_lock) 173 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 174 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 175 176 static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 177 #define V_acqtree VNET(acqtree) 178 static struct mtx acq_lock; 179 #define ACQ_LOCK_INIT() \ 180 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 181 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 182 #define ACQ_LOCK() mtx_lock(&acq_lock) 183 #define ACQ_UNLOCK() mtx_unlock(&acq_lock) 184 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 185 186 /* SP acquiring list */ 187 static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 188 #define V_spacqtree VNET(spacqtree) 189 static struct mtx spacq_lock; 190 #define SPACQ_LOCK_INIT() \ 191 mtx_init(&spacq_lock, "spacqtree", \ 192 "fast ipsec security policy acquire list", MTX_DEF) 193 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 194 #define SPACQ_LOCK() mtx_lock(&spacq_lock) 195 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 196 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 197 198 /* search order for SAs */ 199 static const u_int saorder_state_valid_prefer_old[] = { 200 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 201 }; 202 static const u_int saorder_state_valid_prefer_new[] = { 203 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 204 }; 205 static const u_int saorder_state_alive[] = { 206 /* except DEAD */ 207 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 208 }; 209 static const u_int saorder_state_any[] = { 210 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 211 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 212 }; 213 214 static const int minsize[] = { 215 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 216 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 217 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 220 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 221 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 223 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 224 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 225 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 226 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 227 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 228 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 229 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 230 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 231 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 232 0, /* SADB_X_EXT_KMPRIVATE */ 233 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 234 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 235 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 236 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 237 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 238 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 239 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 240 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 241 }; 242 static const int maxsize[] = { 243 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 244 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 245 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 246 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 248 0, /* SADB_EXT_ADDRESS_SRC */ 249 0, /* SADB_EXT_ADDRESS_DST */ 250 0, /* SADB_EXT_ADDRESS_PROXY */ 251 0, /* SADB_EXT_KEY_AUTH */ 252 0, /* SADB_EXT_KEY_ENCRYPT */ 253 0, /* SADB_EXT_IDENTITY_SRC */ 254 0, /* SADB_EXT_IDENTITY_DST */ 255 0, /* SADB_EXT_SENSITIVITY */ 256 0, /* SADB_EXT_PROPOSAL */ 257 0, /* SADB_EXT_SUPPORTED_AUTH */ 258 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 259 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 260 0, /* SADB_X_EXT_KMPRIVATE */ 261 0, /* SADB_X_EXT_POLICY */ 262 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 263 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 264 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 265 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 266 0, /* SADB_X_EXT_NAT_T_OAI */ 267 0, /* SADB_X_EXT_NAT_T_OAR */ 268 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 269 }; 270 271 static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 272 static VNET_DEFINE(int, ipsec_esp_auth) = 0; 273 static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 274 275 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 276 #define V_ipsec_esp_auth VNET(ipsec_esp_auth) 277 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 278 279 #ifdef SYSCTL_DECL 280 SYSCTL_DECL(_net_key); 281 #endif 282 283 SYSCTL_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 */ 287 SYSCTL_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. */ 291 SYSCTL_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. */ 295 SYSCTL_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 */ 299 SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 300 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 301 302 /* lifetime for larval SA */ 303 SYSCTL_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 */ 307 SYSCTL_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 */ 311 SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 312 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 313 314 /* ESP auth */ 315 SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 316 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 317 318 /* minimum ESP key length */ 319 SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 320 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 321 322 /* minimum AH key length */ 323 SYSCTL_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 */ 327 SYSCTL_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) \ 333 do {\ 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) \ 345 do { \ 346 if ((head) != (sav)) { \ 347 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 348 (name), (head), (sav))); \ 349 break; \ 350 } \ 351 } while (0) 352 353 #define KEY_CHKSPDIR(head, sp, name) \ 354 do { \ 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) 361 362 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 363 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 364 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 365 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 366 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 367 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 368 MALLOC_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) \ 375 do { \ 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) \ 390 do { \ 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 */ 400 struct _keystat { 401 u_long getspi_count; /* the avarage of count to try to get new SPI */ 402 } keystat; 403 404 struct 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 }; 410 411 static struct secasvar *key_allocsa_policy(const struct secasindex *); 412 static void key_freesp_so(struct secpolicy **); 413 static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int); 414 static void key_delsp(struct secpolicy *); 415 static struct secpolicy *key_getsp(struct secpolicyindex *); 416 static void _key_delsp(struct secpolicy *sp); 417 static struct secpolicy *key_getspbyid(u_int32_t); 418 static u_int32_t key_newreqid(void); 419 static struct mbuf *key_gather_mbuf(struct mbuf *, 420 const struct sadb_msghdr *, int, int, ...); 421 static int key_spdadd(struct socket *, struct mbuf *, 422 const struct sadb_msghdr *); 423 static u_int32_t key_getnewspid(void); 424 static int key_spddelete(struct socket *, struct mbuf *, 425 const struct sadb_msghdr *); 426 static int key_spddelete2(struct socket *, struct mbuf *, 427 const struct sadb_msghdr *); 428 static int key_spdget(struct socket *, struct mbuf *, 429 const struct sadb_msghdr *); 430 static int key_spdflush(struct socket *, struct mbuf *, 431 const struct sadb_msghdr *); 432 static int key_spddump(struct socket *, struct mbuf *, 433 const struct sadb_msghdr *); 434 static struct mbuf *key_setdumpsp(struct secpolicy *, 435 u_int8_t, u_int32_t, u_int32_t); 436 static u_int key_getspreqmsglen(struct secpolicy *); 437 static int key_spdexpire(struct secpolicy *); 438 static struct secashead *key_newsah(struct secasindex *); 439 static void key_delsah(struct secashead *); 440 static struct secasvar *key_newsav(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__) 445 static void key_delsav(struct secasvar *); 446 static struct secashead *key_getsah(struct secasindex *); 447 static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t); 448 static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t); 449 static int key_setsaval(struct secasvar *, struct mbuf *, 450 const struct sadb_msghdr *); 451 static int key_mature(struct secasvar *); 452 static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t, 453 u_int8_t, u_int32_t, u_int32_t); 454 static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t, 455 u_int32_t, pid_t, u_int16_t); 456 static struct mbuf *key_setsadbsa(struct secasvar *); 457 static struct mbuf *key_setsadbaddr(u_int16_t, 458 const struct sockaddr *, u_int8_t, u_int16_t); 459 #ifdef IPSEC_NAT_T 460 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 461 static struct mbuf *key_setsadbxtype(u_int16_t); 462 #endif 463 static void key_porttosaddr(struct sockaddr *, u_int16_t); 464 #define KEY_PORTTOSADDR(saddr, port) \ 465 key_porttosaddr((struct sockaddr *)(saddr), (port)) 466 static struct mbuf *key_setsadbxsa2(u_int8_t, u_int32_t, u_int32_t); 467 static struct mbuf *key_setsadbxpolicy(u_int16_t, u_int8_t, 468 u_int32_t); 469 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 470 struct malloc_type *); 471 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 472 struct malloc_type *type); 473 #ifdef INET6 474 static int key_ismyaddr6(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. */ 482 static int key_cmpsaidx(const struct secasindex *, 483 const struct secasindex *, int); 484 static int key_cmpspidx_exactly(struct secpolicyindex *, 485 struct secpolicyindex *); 486 static int key_cmpspidx_withmask(struct secpolicyindex *, 487 struct secpolicyindex *); 488 static int key_sockaddrcmp(const struct sockaddr *, 489 const struct sockaddr *, int); 490 static int key_bbcmp(const void *, const void *, u_int); 491 static u_int16_t key_satype2proto(u_int8_t); 492 static u_int8_t key_proto2satype(u_int16_t); 493 494 static int key_getspi(struct socket *, struct mbuf *, 495 const struct sadb_msghdr *); 496 static u_int32_t key_do_getnewspi(struct sadb_spirange *, 497 struct secasindex *); 498 static int key_update(struct socket *, struct mbuf *, 499 const struct sadb_msghdr *); 500 #ifdef IPSEC_DOSEQCHECK 501 static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t); 502 #endif 503 static int key_add(struct socket *, struct mbuf *, 504 const struct sadb_msghdr *); 505 static int key_setident(struct secashead *, struct mbuf *, 506 const struct sadb_msghdr *); 507 static struct mbuf *key_getmsgbuf_x1(struct mbuf *, 508 const struct sadb_msghdr *); 509 static int key_delete(struct socket *, struct mbuf *, 510 const struct sadb_msghdr *); 511 static int key_delete_all(struct socket *, struct mbuf *, 512 const struct sadb_msghdr *, u_int16_t); 513 static int key_get(struct socket *, struct mbuf *, 514 const struct sadb_msghdr *); 515 516 static void key_getcomb_setlifetime(struct sadb_comb *); 517 static struct mbuf *key_getcomb_esp(void); 518 static struct mbuf *key_getcomb_ah(void); 519 static struct mbuf *key_getcomb_ipcomp(void); 520 static struct mbuf *key_getprop(const struct secasindex *); 521 522 static int key_acquire(const struct secasindex *, struct secpolicy *); 523 static struct secacq *key_newacq(const struct secasindex *); 524 static struct secacq *key_getacq(const struct secasindex *); 525 static struct secacq *key_getacqbyseq(u_int32_t); 526 static struct secspacq *key_newspacq(struct secpolicyindex *); 527 static struct secspacq *key_getspacq(struct secpolicyindex *); 528 static int key_acquire2(struct socket *, struct mbuf *, 529 const struct sadb_msghdr *); 530 static int key_register(struct socket *, struct mbuf *, 531 const struct sadb_msghdr *); 532 static int key_expire(struct secasvar *, int); 533 static int key_flush(struct socket *, struct mbuf *, 534 const struct sadb_msghdr *); 535 static int key_dump(struct socket *, struct mbuf *, 536 const struct sadb_msghdr *); 537 static int key_promisc(struct socket *, struct mbuf *, 538 const struct sadb_msghdr *); 539 static int key_senderror(struct socket *, struct mbuf *, int); 540 static int key_validate_ext(const struct sadb_ext *, int); 541 static int key_align(struct mbuf *, struct sadb_msghdr *); 542 static struct mbuf *key_setlifetime(struct seclifetime *src, 543 u_int16_t exttype); 544 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 545 546 #if 0 547 static const char *key_getfqdn(void); 548 static const char *key_getuserfqdn(void); 549 #endif 550 static void key_sa_chgstate(struct secasvar *, u_int8_t); 551 552 static __inline void 553 sa_initref(struct secasvar *sav) 554 { 555 556 refcount_init(&sav->refcnt, 1); 557 } 558 static __inline void 559 sa_addref(struct secasvar *sav) 560 { 561 562 refcount_acquire(&sav->refcnt); 563 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 564 } 565 static __inline int 566 sa_delref(struct secasvar *sav) 567 { 568 569 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 570 return (refcount_release(&sav->refcnt)); 571 } 572 573 #define SP_ADDREF(p) do { \ 574 (p)->refcnt++; \ 575 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 576 } while (0) 577 #define SP_DELREF(p) do { \ 578 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 579 (p)->refcnt--; \ 580 } while (0) 581 582 583 /* 584 * Update the refcnt while holding the SPTREE lock. 585 */ 586 void 587 key_addref(struct secpolicy *sp) 588 { 589 SPTREE_LOCK(); 590 SP_ADDREF(sp); 591 SPTREE_UNLOCK(); 592 } 593 594 /* 595 * Return 0 when there are known to be no SP's for the specified 596 * direction. Otherwise return 1. This is used by IPsec code 597 * to optimize performance. 598 */ 599 int 600 key_havesp(u_int dir) 601 { 602 603 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 604 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 605 } 606 607 /* %%% IPsec policy management */ 608 /* 609 * allocating a SP for OUTBOUND or INBOUND packet. 610 * Must call key_freesp() later. 611 * OUT: NULL: not found 612 * others: found and return the pointer. 613 */ 614 struct secpolicy * 615 key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, 616 int tag) 617 { 618 struct secpolicy *sp; 619 620 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 621 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 622 ("invalid direction %u", dir)); 623 624 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 625 printf("DP %s from %s:%u\n", __func__, where, tag)); 626 627 /* get a SP entry */ 628 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 629 printf("*** objects\n"); 630 kdebug_secpolicyindex(spidx)); 631 632 SPTREE_LOCK(); 633 LIST_FOREACH(sp, &V_sptree[dir], chain) { 634 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 635 printf("*** in SPD\n"); 636 kdebug_secpolicyindex(&sp->spidx)); 637 638 if (sp->state == IPSEC_SPSTATE_DEAD) 639 continue; 640 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 641 goto found; 642 } 643 sp = NULL; 644 found: 645 if (sp) { 646 /* sanity check */ 647 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 648 649 /* found a SPD entry */ 650 sp->lastused = time_second; 651 SP_ADDREF(sp); 652 } 653 SPTREE_UNLOCK(); 654 655 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 656 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 657 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 658 return sp; 659 } 660 661 /* 662 * allocating a SP for OUTBOUND or INBOUND packet. 663 * Must call key_freesp() later. 664 * OUT: NULL: not found 665 * others: found and return the pointer. 666 */ 667 struct secpolicy * 668 key_allocsp2(u_int32_t spi, union sockaddr_union *dst, u_int8_t proto, 669 u_int dir, const char* where, int tag) 670 { 671 struct secpolicy *sp; 672 673 IPSEC_ASSERT(dst != NULL, ("null dst")); 674 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 675 ("invalid direction %u", dir)); 676 677 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 678 printf("DP %s from %s:%u\n", __func__, where, tag)); 679 680 /* get a SP entry */ 681 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 682 printf("*** objects\n"); 683 printf("spi %u proto %u dir %u\n", spi, proto, dir); 684 kdebug_sockaddr(&dst->sa)); 685 686 SPTREE_LOCK(); 687 LIST_FOREACH(sp, &V_sptree[dir], chain) { 688 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 689 printf("*** in SPD\n"); 690 kdebug_secpolicyindex(&sp->spidx)); 691 692 if (sp->state == IPSEC_SPSTATE_DEAD) 693 continue; 694 /* compare simple values, then dst address */ 695 if (sp->spidx.ul_proto != proto) 696 continue; 697 /* NB: spi's must exist and match */ 698 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 699 continue; 700 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 701 goto found; 702 } 703 sp = NULL; 704 found: 705 if (sp) { 706 /* sanity check */ 707 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 708 709 /* found a SPD entry */ 710 sp->lastused = time_second; 711 SP_ADDREF(sp); 712 } 713 SPTREE_UNLOCK(); 714 715 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 716 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 717 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 718 return sp; 719 } 720 721 #if 0 722 /* 723 * return a policy that matches this particular inbound packet. 724 * XXX slow 725 */ 726 struct secpolicy * 727 key_gettunnel(const struct sockaddr *osrc, 728 const struct sockaddr *odst, 729 const struct sockaddr *isrc, 730 const struct sockaddr *idst, 731 const char* where, int tag) 732 { 733 struct secpolicy *sp; 734 const int dir = IPSEC_DIR_INBOUND; 735 struct ipsecrequest *r1, *r2, *p; 736 struct secpolicyindex spidx; 737 738 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 739 printf("DP %s from %s:%u\n", __func__, where, tag)); 740 741 if (isrc->sa_family != idst->sa_family) { 742 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 743 __func__, isrc->sa_family, idst->sa_family)); 744 sp = NULL; 745 goto done; 746 } 747 748 SPTREE_LOCK(); 749 LIST_FOREACH(sp, &V_sptree[dir], chain) { 750 if (sp->state == IPSEC_SPSTATE_DEAD) 751 continue; 752 753 r1 = r2 = NULL; 754 for (p = sp->req; p; p = p->next) { 755 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 756 continue; 757 758 r1 = r2; 759 r2 = p; 760 761 if (!r1) { 762 /* here we look at address matches only */ 763 spidx = sp->spidx; 764 if (isrc->sa_len > sizeof(spidx.src) || 765 idst->sa_len > sizeof(spidx.dst)) 766 continue; 767 bcopy(isrc, &spidx.src, isrc->sa_len); 768 bcopy(idst, &spidx.dst, idst->sa_len); 769 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 770 continue; 771 } else { 772 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 773 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 774 continue; 775 } 776 777 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 778 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 779 continue; 780 781 goto found; 782 } 783 } 784 sp = NULL; 785 found: 786 if (sp) { 787 sp->lastused = time_second; 788 SP_ADDREF(sp); 789 } 790 SPTREE_UNLOCK(); 791 done: 792 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 793 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 794 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 795 return sp; 796 } 797 #endif 798 799 /* 800 * allocating an SA entry for an *OUTBOUND* packet. 801 * checking each request entries in SP, and acquire an SA if need. 802 * OUT: 0: there are valid requests. 803 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 804 */ 805 int 806 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 807 { 808 u_int level; 809 int error; 810 struct secasvar *sav; 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); 828 829 /* 830 * We check new SA in the IPsec request because a different 831 * SA may be involved each time this request is checked, either 832 * because new SAs are being configured, or this request is 833 * associated with an unconnected datagram socket, or this request 834 * is associated with a system default policy. 835 * 836 * key_allocsa_policy should allocate the oldest SA available. 837 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 838 */ 839 sav = key_allocsa_policy(saidx); 840 if (sav != isr->sav) { 841 /* SA need to be updated. */ 842 if (!IPSECREQUEST_UPGRADE(isr)) { 843 /* Kick everyone off. */ 844 IPSECREQUEST_UNLOCK(isr); 845 IPSECREQUEST_WLOCK(isr); 846 } 847 if (isr->sav != NULL) 848 KEY_FREESAV(&isr->sav); 849 isr->sav = sav; 850 IPSECREQUEST_DOWNGRADE(isr); 851 } else if (sav != NULL) 852 KEY_FREESAV(&sav); 853 854 /* When there is SA. */ 855 if (isr->sav != NULL) { 856 if (isr->sav->state != SADB_SASTATE_MATURE && 857 isr->sav->state != SADB_SASTATE_DYING) 858 return EINVAL; 859 return 0; 860 } 861 862 /* there is no SA */ 863 error = key_acquire(saidx, isr->sp); 864 if (error != 0) { 865 /* XXX What should I do ? */ 866 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 867 __func__, error)); 868 return error; 869 } 870 871 if (level != IPSEC_LEVEL_REQUIRE) { 872 /* XXX sigh, the interface to this routine is botched */ 873 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 874 return 0; 875 } else { 876 return ENOENT; 877 } 878 } 879 880 /* 881 * allocating a SA for policy entry from SAD. 882 * NOTE: searching SAD of aliving state. 883 * OUT: NULL: not found. 884 * others: found and return the pointer. 885 */ 886 static struct secasvar * 887 key_allocsa_policy(const struct secasindex *saidx) 888 { 889 #define N(a) _ARRAYLEN(a) 890 struct secashead *sah; 891 struct secasvar *sav; 892 u_int stateidx, arraysize; 893 const u_int *state_valid; 894 895 state_valid = NULL; /* silence gcc */ 896 arraysize = 0; /* silence gcc */ 897 898 SAHTREE_LOCK(); 899 LIST_FOREACH(sah, &V_sahtree, chain) { 900 if (sah->state == SADB_SASTATE_DEAD) 901 continue; 902 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 903 if (V_key_preferred_oldsa) { 904 state_valid = saorder_state_valid_prefer_old; 905 arraysize = N(saorder_state_valid_prefer_old); 906 } else { 907 state_valid = saorder_state_valid_prefer_new; 908 arraysize = N(saorder_state_valid_prefer_new); 909 } 910 break; 911 } 912 } 913 SAHTREE_UNLOCK(); 914 if (sah == NULL) 915 return NULL; 916 917 /* search valid state */ 918 for (stateidx = 0; stateidx < arraysize; stateidx++) { 919 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 920 if (sav != NULL) 921 return sav; 922 } 923 924 return NULL; 925 #undef N 926 } 927 928 /* 929 * searching SAD with direction, protocol, mode and state. 930 * called by key_allocsa_policy(). 931 * OUT: 932 * NULL : not found 933 * others : found, pointer to a SA. 934 */ 935 static struct secasvar * 936 key_do_allocsa_policy(struct secashead *sah, u_int state) 937 { 938 struct secasvar *sav, *nextsav, *candidate, *d; 939 940 /* initilize */ 941 candidate = NULL; 942 943 SAHTREE_LOCK(); 944 for (sav = LIST_FIRST(&sah->savtree[state]); 945 sav != NULL; 946 sav = nextsav) { 947 948 nextsav = LIST_NEXT(sav, chain); 949 950 /* sanity check */ 951 KEY_CHKSASTATE(sav->state, state, __func__); 952 953 /* initialize */ 954 if (candidate == NULL) { 955 candidate = sav; 956 continue; 957 } 958 959 /* Which SA is the better ? */ 960 961 IPSEC_ASSERT(candidate->lft_c != NULL, 962 ("null candidate lifetime")); 963 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 964 965 /* What the best method is to compare ? */ 966 if (V_key_preferred_oldsa) { 967 if (candidate->lft_c->addtime > 968 sav->lft_c->addtime) { 969 candidate = sav; 970 } 971 continue; 972 /*NOTREACHED*/ 973 } 974 975 /* preferred new sa rather than old sa */ 976 if (candidate->lft_c->addtime < 977 sav->lft_c->addtime) { 978 d = candidate; 979 candidate = sav; 980 } else 981 d = sav; 982 983 /* 984 * prepared to delete the SA when there is more 985 * suitable candidate and the lifetime of the SA is not 986 * permanent. 987 */ 988 if (d->lft_h->addtime != 0) { 989 struct mbuf *m, *result; 990 u_int8_t satype; 991 992 key_sa_chgstate(d, SADB_SASTATE_DEAD); 993 994 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 995 996 satype = key_proto2satype(d->sah->saidx.proto); 997 if (satype == 0) 998 goto msgfail; 999 1000 m = key_setsadbmsg(SADB_DELETE, 0, 1001 satype, 0, 0, d->refcnt - 1); 1002 if (!m) 1003 goto msgfail; 1004 result = m; 1005 1006 /* set sadb_address for saidx's. */ 1007 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1008 &d->sah->saidx.src.sa, 1009 d->sah->saidx.src.sa.sa_len << 3, 1010 IPSEC_ULPROTO_ANY); 1011 if (!m) 1012 goto msgfail; 1013 m_cat(result, m); 1014 1015 /* set sadb_address for saidx's. */ 1016 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1017 &d->sah->saidx.dst.sa, 1018 d->sah->saidx.dst.sa.sa_len << 3, 1019 IPSEC_ULPROTO_ANY); 1020 if (!m) 1021 goto msgfail; 1022 m_cat(result, m); 1023 1024 /* create SA extension */ 1025 m = key_setsadbsa(d); 1026 if (!m) 1027 goto msgfail; 1028 m_cat(result, m); 1029 1030 if (result->m_len < sizeof(struct sadb_msg)) { 1031 result = m_pullup(result, 1032 sizeof(struct sadb_msg)); 1033 if (result == NULL) 1034 goto msgfail; 1035 } 1036 1037 result->m_pkthdr.len = 0; 1038 for (m = result; m; m = m->m_next) 1039 result->m_pkthdr.len += m->m_len; 1040 mtod(result, struct sadb_msg *)->sadb_msg_len = 1041 PFKEY_UNIT64(result->m_pkthdr.len); 1042 1043 if (key_sendup_mbuf(NULL, result, 1044 KEY_SENDUP_REGISTERED)) 1045 goto msgfail; 1046 msgfail: 1047 KEY_FREESAV(&d); 1048 } 1049 } 1050 if (candidate) { 1051 sa_addref(candidate); 1052 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1053 printf("DP %s cause refcnt++:%d SA:%p\n", 1054 __func__, candidate->refcnt, candidate)); 1055 } 1056 SAHTREE_UNLOCK(); 1057 1058 return candidate; 1059 } 1060 1061 /* 1062 * allocating a usable SA entry for a *INBOUND* packet. 1063 * Must call key_freesav() later. 1064 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1065 * NULL: not found, or error occured. 1066 * 1067 * In the comparison, no source address is used--for RFC2401 conformance. 1068 * To quote, from section 4.1: 1069 * A security association is uniquely identified by a triple consisting 1070 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1071 * security protocol (AH or ESP) identifier. 1072 * Note that, however, we do need to keep source address in IPsec SA. 1073 * IKE specification and PF_KEY specification do assume that we 1074 * keep source address in IPsec SA. We see a tricky situation here. 1075 */ 1076 struct secasvar * 1077 key_allocsa(union sockaddr_union *dst, u_int proto, u_int32_t spi, 1078 const char* where, int tag) 1079 { 1080 struct secashead *sah; 1081 struct secasvar *sav; 1082 u_int stateidx, arraysize, state; 1083 const u_int *saorder_state_valid; 1084 #ifdef IPSEC_NAT_T 1085 int natt_chkport; 1086 #endif 1087 1088 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1089 1090 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1091 printf("DP %s from %s:%u\n", __func__, where, tag)); 1092 1093 #ifdef IPSEC_NAT_T 1094 natt_chkport = (dst->sa.sa_family == AF_INET && 1095 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1096 dst->sin.sin_port != 0); 1097 #endif 1098 1099 /* 1100 * searching SAD. 1101 * XXX: to be checked internal IP header somewhere. Also when 1102 * IPsec tunnel packet is received. But ESP tunnel mode is 1103 * encrypted so we can't check internal IP header. 1104 */ 1105 SAHTREE_LOCK(); 1106 if (V_key_preferred_oldsa) { 1107 saorder_state_valid = saorder_state_valid_prefer_old; 1108 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1109 } else { 1110 saorder_state_valid = saorder_state_valid_prefer_new; 1111 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1112 } 1113 LIST_FOREACH(sah, &V_sahtree, chain) { 1114 int checkport; 1115 1116 /* search valid state */ 1117 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1118 state = saorder_state_valid[stateidx]; 1119 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1120 /* sanity check */ 1121 KEY_CHKSASTATE(sav->state, state, __func__); 1122 /* do not return entries w/ unusable state */ 1123 if (sav->state != SADB_SASTATE_MATURE && 1124 sav->state != SADB_SASTATE_DYING) 1125 continue; 1126 if (proto != sav->sah->saidx.proto) 1127 continue; 1128 if (spi != sav->spi) 1129 continue; 1130 checkport = 0; 1131 #ifdef IPSEC_NAT_T 1132 /* 1133 * Really only check ports when this is a NAT-T 1134 * SA. Otherwise other lookups providing ports 1135 * might suffer. 1136 */ 1137 if (sav->natt_type && natt_chkport) 1138 checkport = 1; 1139 #endif 1140 #if 0 /* don't check src */ 1141 /* check src address */ 1142 if (key_sockaddrcmp(&src->sa, 1143 &sav->sah->saidx.src.sa, checkport) != 0) 1144 continue; 1145 #endif 1146 /* check dst address */ 1147 if (key_sockaddrcmp(&dst->sa, 1148 &sav->sah->saidx.dst.sa, checkport) != 0) 1149 continue; 1150 sa_addref(sav); 1151 goto done; 1152 } 1153 } 1154 } 1155 sav = NULL; 1156 done: 1157 SAHTREE_UNLOCK(); 1158 1159 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1160 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1161 sav, sav ? sav->refcnt : 0)); 1162 return sav; 1163 } 1164 1165 /* 1166 * Must be called after calling key_allocsp(). 1167 * For both the packet without socket and key_freeso(). 1168 */ 1169 void 1170 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1171 { 1172 struct secpolicy *sp = *spp; 1173 1174 IPSEC_ASSERT(sp != NULL, ("null sp")); 1175 1176 SPTREE_LOCK(); 1177 SP_DELREF(sp); 1178 1179 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1180 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1181 __func__, sp, sp->id, where, tag, sp->refcnt)); 1182 1183 if (sp->refcnt == 0) { 1184 *spp = NULL; 1185 key_delsp(sp); 1186 } 1187 SPTREE_UNLOCK(); 1188 } 1189 1190 /* 1191 * Must be called after calling key_allocsp(). 1192 * For the packet with socket. 1193 */ 1194 void 1195 key_freeso(struct socket *so) 1196 { 1197 IPSEC_ASSERT(so != NULL, ("null so")); 1198 1199 switch (so->so_proto->pr_domain->dom_family) { 1200 #if defined(INET) || defined(INET6) 1201 #ifdef INET 1202 case PF_INET: 1203 #endif 1204 #ifdef INET6 1205 case PF_INET6: 1206 #endif 1207 { 1208 struct inpcb *pcb = sotoinpcb(so); 1209 1210 /* Does it have a PCB ? */ 1211 if (pcb == NULL) 1212 return; 1213 key_freesp_so(&pcb->inp_sp->sp_in); 1214 key_freesp_so(&pcb->inp_sp->sp_out); 1215 } 1216 break; 1217 #endif /* INET || INET6 */ 1218 default: 1219 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1220 __func__, so->so_proto->pr_domain->dom_family)); 1221 return; 1222 } 1223 } 1224 1225 static void 1226 key_freesp_so(struct secpolicy **sp) 1227 { 1228 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1229 1230 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1231 (*sp)->policy == IPSEC_POLICY_BYPASS) 1232 return; 1233 1234 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1235 ("invalid policy %u", (*sp)->policy)); 1236 KEY_FREESP(sp); 1237 } 1238 1239 void 1240 key_addrefsa(struct secasvar *sav, const char* where, int tag) 1241 { 1242 1243 IPSEC_ASSERT(sav != NULL, ("null sav")); 1244 IPSEC_ASSERT(sav->refcnt > 0, ("refcount must exist")); 1245 1246 sa_addref(sav); 1247 } 1248 1249 /* 1250 * Must be called after calling key_allocsa(). 1251 * This function is called by key_freesp() to free some SA allocated 1252 * for a policy. 1253 */ 1254 void 1255 key_freesav(struct secasvar **psav, const char* where, int tag) 1256 { 1257 struct secasvar *sav = *psav; 1258 1259 IPSEC_ASSERT(sav != NULL, ("null sav")); 1260 1261 if (sa_delref(sav)) { 1262 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1263 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1264 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1265 *psav = NULL; 1266 key_delsav(sav); 1267 } else { 1268 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1269 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1270 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1271 } 1272 } 1273 1274 /* %%% SPD management */ 1275 /* 1276 * free security policy entry. 1277 */ 1278 static void 1279 key_delsp(struct secpolicy *sp) 1280 { 1281 struct ipsecrequest *isr, *nextisr; 1282 1283 IPSEC_ASSERT(sp != NULL, ("null sp")); 1284 SPTREE_LOCK_ASSERT(); 1285 1286 sp->state = IPSEC_SPSTATE_DEAD; 1287 1288 IPSEC_ASSERT(sp->refcnt == 0, 1289 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1290 1291 /* remove from SP index */ 1292 if (__LIST_CHAINED(sp)) 1293 LIST_REMOVE(sp, chain); 1294 1295 for (isr = sp->req; isr != NULL; isr = nextisr) { 1296 if (isr->sav != NULL) { 1297 KEY_FREESAV(&isr->sav); 1298 isr->sav = NULL; 1299 } 1300 1301 nextisr = isr->next; 1302 ipsec_delisr(isr); 1303 } 1304 _key_delsp(sp); 1305 } 1306 1307 /* 1308 * search SPD 1309 * OUT: NULL : not found 1310 * others : found, pointer to a SP. 1311 */ 1312 static struct secpolicy * 1313 key_getsp(struct secpolicyindex *spidx) 1314 { 1315 struct secpolicy *sp; 1316 1317 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1318 1319 SPTREE_LOCK(); 1320 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1321 if (sp->state == IPSEC_SPSTATE_DEAD) 1322 continue; 1323 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1324 SP_ADDREF(sp); 1325 break; 1326 } 1327 } 1328 SPTREE_UNLOCK(); 1329 1330 return sp; 1331 } 1332 1333 /* 1334 * get SP by index. 1335 * OUT: NULL : not found 1336 * others : found, pointer to a SP. 1337 */ 1338 static struct secpolicy * 1339 key_getspbyid(u_int32_t id) 1340 { 1341 struct secpolicy *sp; 1342 1343 SPTREE_LOCK(); 1344 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1345 if (sp->state == IPSEC_SPSTATE_DEAD) 1346 continue; 1347 if (sp->id == id) { 1348 SP_ADDREF(sp); 1349 goto done; 1350 } 1351 } 1352 1353 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1354 if (sp->state == IPSEC_SPSTATE_DEAD) 1355 continue; 1356 if (sp->id == id) { 1357 SP_ADDREF(sp); 1358 goto done; 1359 } 1360 } 1361 done: 1362 SPTREE_UNLOCK(); 1363 1364 return sp; 1365 } 1366 1367 struct secpolicy * 1368 key_newsp(const char* where, int tag) 1369 { 1370 struct secpolicy *newsp = NULL; 1371 1372 newsp = (struct secpolicy *) 1373 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1374 if (newsp) { 1375 SECPOLICY_LOCK_INIT(newsp); 1376 newsp->refcnt = 1; 1377 newsp->req = NULL; 1378 } 1379 1380 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1381 printf("DP %s from %s:%u return SP:%p\n", __func__, 1382 where, tag, newsp)); 1383 return newsp; 1384 } 1385 1386 static void 1387 _key_delsp(struct secpolicy *sp) 1388 { 1389 SECPOLICY_LOCK_DESTROY(sp); 1390 free(sp, M_IPSEC_SP); 1391 } 1392 1393 /* 1394 * create secpolicy structure from sadb_x_policy structure. 1395 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1396 * so must be set properly later. 1397 */ 1398 struct secpolicy * 1399 key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error) 1400 { 1401 struct secpolicy *newsp; 1402 1403 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1404 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1405 1406 if (len != PFKEY_EXTLEN(xpl0)) { 1407 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1408 *error = EINVAL; 1409 return NULL; 1410 } 1411 1412 if ((newsp = KEY_NEWSP()) == NULL) { 1413 *error = ENOBUFS; 1414 return NULL; 1415 } 1416 1417 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1418 newsp->policy = xpl0->sadb_x_policy_type; 1419 1420 /* check policy */ 1421 switch (xpl0->sadb_x_policy_type) { 1422 case IPSEC_POLICY_DISCARD: 1423 case IPSEC_POLICY_NONE: 1424 case IPSEC_POLICY_ENTRUST: 1425 case IPSEC_POLICY_BYPASS: 1426 newsp->req = NULL; 1427 break; 1428 1429 case IPSEC_POLICY_IPSEC: 1430 { 1431 int tlen; 1432 struct sadb_x_ipsecrequest *xisr; 1433 struct ipsecrequest **p_isr = &newsp->req; 1434 1435 /* validity check */ 1436 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1437 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1438 __func__)); 1439 KEY_FREESP(&newsp); 1440 *error = EINVAL; 1441 return NULL; 1442 } 1443 1444 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1445 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1446 1447 while (tlen > 0) { 1448 /* length check */ 1449 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1450 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1451 "length.\n", __func__)); 1452 KEY_FREESP(&newsp); 1453 *error = EINVAL; 1454 return NULL; 1455 } 1456 1457 /* allocate request buffer */ 1458 /* NB: data structure is zero'd */ 1459 *p_isr = ipsec_newisr(); 1460 if ((*p_isr) == NULL) { 1461 ipseclog((LOG_DEBUG, 1462 "%s: No more memory.\n", __func__)); 1463 KEY_FREESP(&newsp); 1464 *error = ENOBUFS; 1465 return NULL; 1466 } 1467 1468 /* set values */ 1469 switch (xisr->sadb_x_ipsecrequest_proto) { 1470 case IPPROTO_ESP: 1471 case IPPROTO_AH: 1472 case IPPROTO_IPCOMP: 1473 break; 1474 default: 1475 ipseclog((LOG_DEBUG, 1476 "%s: invalid proto type=%u\n", __func__, 1477 xisr->sadb_x_ipsecrequest_proto)); 1478 KEY_FREESP(&newsp); 1479 *error = EPROTONOSUPPORT; 1480 return NULL; 1481 } 1482 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1483 1484 switch (xisr->sadb_x_ipsecrequest_mode) { 1485 case IPSEC_MODE_TRANSPORT: 1486 case IPSEC_MODE_TUNNEL: 1487 break; 1488 case IPSEC_MODE_ANY: 1489 default: 1490 ipseclog((LOG_DEBUG, 1491 "%s: invalid mode=%u\n", __func__, 1492 xisr->sadb_x_ipsecrequest_mode)); 1493 KEY_FREESP(&newsp); 1494 *error = EINVAL; 1495 return NULL; 1496 } 1497 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1498 1499 switch (xisr->sadb_x_ipsecrequest_level) { 1500 case IPSEC_LEVEL_DEFAULT: 1501 case IPSEC_LEVEL_USE: 1502 case IPSEC_LEVEL_REQUIRE: 1503 break; 1504 case IPSEC_LEVEL_UNIQUE: 1505 /* validity check */ 1506 /* 1507 * If range violation of reqid, kernel will 1508 * update it, don't refuse it. 1509 */ 1510 if (xisr->sadb_x_ipsecrequest_reqid 1511 > IPSEC_MANUAL_REQID_MAX) { 1512 ipseclog((LOG_DEBUG, 1513 "%s: reqid=%d range " 1514 "violation, updated by kernel.\n", 1515 __func__, 1516 xisr->sadb_x_ipsecrequest_reqid)); 1517 xisr->sadb_x_ipsecrequest_reqid = 0; 1518 } 1519 1520 /* allocate new reqid id if reqid is zero. */ 1521 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1522 u_int32_t reqid; 1523 if ((reqid = key_newreqid()) == 0) { 1524 KEY_FREESP(&newsp); 1525 *error = ENOBUFS; 1526 return NULL; 1527 } 1528 (*p_isr)->saidx.reqid = reqid; 1529 xisr->sadb_x_ipsecrequest_reqid = reqid; 1530 } else { 1531 /* set it for manual keying. */ 1532 (*p_isr)->saidx.reqid = 1533 xisr->sadb_x_ipsecrequest_reqid; 1534 } 1535 break; 1536 1537 default: 1538 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1539 __func__, 1540 xisr->sadb_x_ipsecrequest_level)); 1541 KEY_FREESP(&newsp); 1542 *error = EINVAL; 1543 return NULL; 1544 } 1545 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1546 1547 /* set IP addresses if there */ 1548 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1549 struct sockaddr *paddr; 1550 1551 paddr = (struct sockaddr *)(xisr + 1); 1552 1553 /* validity check */ 1554 if (paddr->sa_len 1555 > sizeof((*p_isr)->saidx.src)) { 1556 ipseclog((LOG_DEBUG, "%s: invalid " 1557 "request address length.\n", 1558 __func__)); 1559 KEY_FREESP(&newsp); 1560 *error = EINVAL; 1561 return NULL; 1562 } 1563 bcopy(paddr, &(*p_isr)->saidx.src, 1564 paddr->sa_len); 1565 1566 paddr = (struct sockaddr *)((caddr_t)paddr 1567 + paddr->sa_len); 1568 1569 /* validity check */ 1570 if (paddr->sa_len 1571 > sizeof((*p_isr)->saidx.dst)) { 1572 ipseclog((LOG_DEBUG, "%s: invalid " 1573 "request address length.\n", 1574 __func__)); 1575 KEY_FREESP(&newsp); 1576 *error = EINVAL; 1577 return NULL; 1578 } 1579 bcopy(paddr, &(*p_isr)->saidx.dst, 1580 paddr->sa_len); 1581 } 1582 1583 (*p_isr)->sp = newsp; 1584 1585 /* initialization for the next. */ 1586 p_isr = &(*p_isr)->next; 1587 tlen -= xisr->sadb_x_ipsecrequest_len; 1588 1589 /* validity check */ 1590 if (tlen < 0) { 1591 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1592 __func__)); 1593 KEY_FREESP(&newsp); 1594 *error = EINVAL; 1595 return NULL; 1596 } 1597 1598 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1599 + xisr->sadb_x_ipsecrequest_len); 1600 } 1601 } 1602 break; 1603 default: 1604 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1605 KEY_FREESP(&newsp); 1606 *error = EINVAL; 1607 return NULL; 1608 } 1609 1610 *error = 0; 1611 return newsp; 1612 } 1613 1614 static u_int32_t 1615 key_newreqid() 1616 { 1617 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1618 1619 auto_reqid = (auto_reqid == ~0 1620 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1621 1622 /* XXX should be unique check */ 1623 1624 return auto_reqid; 1625 } 1626 1627 /* 1628 * copy secpolicy struct to sadb_x_policy structure indicated. 1629 */ 1630 struct mbuf * 1631 key_sp2msg(struct secpolicy *sp) 1632 { 1633 struct sadb_x_policy *xpl; 1634 int tlen; 1635 caddr_t p; 1636 struct mbuf *m; 1637 1638 IPSEC_ASSERT(sp != NULL, ("null policy")); 1639 1640 tlen = key_getspreqmsglen(sp); 1641 1642 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0); 1643 if (m == NULL) 1644 return (NULL); 1645 m_align(m, tlen); 1646 m->m_len = tlen; 1647 xpl = mtod(m, struct sadb_x_policy *); 1648 bzero(xpl, tlen); 1649 1650 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1651 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1652 xpl->sadb_x_policy_type = sp->policy; 1653 xpl->sadb_x_policy_dir = sp->spidx.dir; 1654 xpl->sadb_x_policy_id = sp->id; 1655 p = (caddr_t)xpl + sizeof(*xpl); 1656 1657 /* if is the policy for ipsec ? */ 1658 if (sp->policy == IPSEC_POLICY_IPSEC) { 1659 struct sadb_x_ipsecrequest *xisr; 1660 struct ipsecrequest *isr; 1661 1662 for (isr = sp->req; isr != NULL; isr = isr->next) { 1663 1664 xisr = (struct sadb_x_ipsecrequest *)p; 1665 1666 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1667 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1668 xisr->sadb_x_ipsecrequest_level = isr->level; 1669 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1670 1671 p += sizeof(*xisr); 1672 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1673 p += isr->saidx.src.sa.sa_len; 1674 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1675 p += isr->saidx.src.sa.sa_len; 1676 1677 xisr->sadb_x_ipsecrequest_len = 1678 PFKEY_ALIGN8(sizeof(*xisr) 1679 + isr->saidx.src.sa.sa_len 1680 + isr->saidx.dst.sa.sa_len); 1681 } 1682 } 1683 1684 return m; 1685 } 1686 1687 /* m will not be freed nor modified */ 1688 static struct mbuf * 1689 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1690 int ndeep, int nitem, ...) 1691 { 1692 va_list ap; 1693 int idx; 1694 int i; 1695 struct mbuf *result = NULL, *n; 1696 int len; 1697 1698 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1699 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1700 1701 va_start(ap, nitem); 1702 for (i = 0; i < nitem; i++) { 1703 idx = va_arg(ap, int); 1704 if (idx < 0 || idx > SADB_EXT_MAX) 1705 goto fail; 1706 /* don't attempt to pull empty extension */ 1707 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1708 continue; 1709 if (idx != SADB_EXT_RESERVED && 1710 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1711 continue; 1712 1713 if (idx == SADB_EXT_RESERVED) { 1714 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1715 1716 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1717 1718 MGETHDR(n, M_NOWAIT, MT_DATA); 1719 if (!n) 1720 goto fail; 1721 n->m_len = len; 1722 n->m_next = NULL; 1723 m_copydata(m, 0, sizeof(struct sadb_msg), 1724 mtod(n, caddr_t)); 1725 } else if (i < ndeep) { 1726 len = mhp->extlen[idx]; 1727 n = m_get2(len, M_NOWAIT, MT_DATA, 0); 1728 if (n == NULL) 1729 goto fail; 1730 m_align(n, len); 1731 n->m_len = len; 1732 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1733 mtod(n, caddr_t)); 1734 } else { 1735 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1736 M_NOWAIT); 1737 } 1738 if (n == NULL) 1739 goto fail; 1740 1741 if (result) 1742 m_cat(result, n); 1743 else 1744 result = n; 1745 } 1746 va_end(ap); 1747 1748 if ((result->m_flags & M_PKTHDR) != 0) { 1749 result->m_pkthdr.len = 0; 1750 for (n = result; n; n = n->m_next) 1751 result->m_pkthdr.len += n->m_len; 1752 } 1753 1754 return result; 1755 1756 fail: 1757 m_freem(result); 1758 va_end(ap); 1759 return NULL; 1760 } 1761 1762 /* 1763 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1764 * add an entry to SP database, when received 1765 * <base, address(SD), (lifetime(H),) policy> 1766 * from the user(?). 1767 * Adding to SP database, 1768 * and send 1769 * <base, address(SD), (lifetime(H),) policy> 1770 * to the socket which was send. 1771 * 1772 * SPDADD set a unique policy entry. 1773 * SPDSETIDX like SPDADD without a part of policy requests. 1774 * SPDUPDATE replace a unique policy entry. 1775 * 1776 * m will always be freed. 1777 */ 1778 static int 1779 key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 1780 { 1781 struct sadb_address *src0, *dst0; 1782 struct sadb_x_policy *xpl0, *xpl; 1783 struct sadb_lifetime *lft = NULL; 1784 struct secpolicyindex spidx; 1785 struct secpolicy *newsp; 1786 int error; 1787 1788 IPSEC_ASSERT(so != NULL, ("null socket")); 1789 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1790 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1791 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1792 1793 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1794 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1795 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1796 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1797 return key_senderror(so, m, EINVAL); 1798 } 1799 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1800 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1801 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1802 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1803 __func__)); 1804 return key_senderror(so, m, EINVAL); 1805 } 1806 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1807 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1808 < sizeof(struct sadb_lifetime)) { 1809 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1810 __func__)); 1811 return key_senderror(so, m, EINVAL); 1812 } 1813 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1814 } 1815 1816 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1817 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1818 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1819 1820 /* 1821 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1822 * we are processing traffic endpoints. 1823 */ 1824 1825 /* make secindex */ 1826 /* XXX boundary check against sa_len */ 1827 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1828 src0 + 1, 1829 dst0 + 1, 1830 src0->sadb_address_prefixlen, 1831 dst0->sadb_address_prefixlen, 1832 src0->sadb_address_proto, 1833 &spidx); 1834 1835 /* checking the direciton. */ 1836 switch (xpl0->sadb_x_policy_dir) { 1837 case IPSEC_DIR_INBOUND: 1838 case IPSEC_DIR_OUTBOUND: 1839 break; 1840 default: 1841 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1842 mhp->msg->sadb_msg_errno = EINVAL; 1843 return 0; 1844 } 1845 1846 /* check policy */ 1847 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1848 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1849 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1850 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1851 return key_senderror(so, m, EINVAL); 1852 } 1853 1854 /* policy requests are mandatory when action is ipsec. */ 1855 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1856 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1857 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1858 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1859 __func__)); 1860 return key_senderror(so, m, EINVAL); 1861 } 1862 1863 /* 1864 * checking there is SP already or not. 1865 * SPDUPDATE doesn't depend on whether there is a SP or not. 1866 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1867 * then error. 1868 */ 1869 newsp = key_getsp(&spidx); 1870 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1871 if (newsp) { 1872 SPTREE_LOCK(); 1873 newsp->state = IPSEC_SPSTATE_DEAD; 1874 SPTREE_UNLOCK(); 1875 KEY_FREESP(&newsp); 1876 } 1877 } else { 1878 if (newsp != NULL) { 1879 KEY_FREESP(&newsp); 1880 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1881 __func__)); 1882 return key_senderror(so, m, EEXIST); 1883 } 1884 } 1885 1886 /* allocation new SP entry */ 1887 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1888 return key_senderror(so, m, error); 1889 } 1890 1891 if ((newsp->id = key_getnewspid()) == 0) { 1892 _key_delsp(newsp); 1893 return key_senderror(so, m, ENOBUFS); 1894 } 1895 1896 /* XXX boundary check against sa_len */ 1897 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1898 src0 + 1, 1899 dst0 + 1, 1900 src0->sadb_address_prefixlen, 1901 dst0->sadb_address_prefixlen, 1902 src0->sadb_address_proto, 1903 &newsp->spidx); 1904 1905 /* sanity check on addr pair */ 1906 if (((struct sockaddr *)(src0 + 1))->sa_family != 1907 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1908 _key_delsp(newsp); 1909 return key_senderror(so, m, EINVAL); 1910 } 1911 if (((struct sockaddr *)(src0 + 1))->sa_len != 1912 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1913 _key_delsp(newsp); 1914 return key_senderror(so, m, EINVAL); 1915 } 1916 #if 1 1917 if (newsp->req && newsp->req->saidx.src.sa.sa_family && newsp->req->saidx.dst.sa.sa_family) { 1918 if (newsp->req->saidx.src.sa.sa_family != newsp->req->saidx.dst.sa.sa_family) { 1919 _key_delsp(newsp); 1920 return key_senderror(so, m, EINVAL); 1921 } 1922 } 1923 #endif 1924 1925 newsp->created = time_second; 1926 newsp->lastused = newsp->created; 1927 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1928 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1929 1930 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1931 newsp->state = IPSEC_SPSTATE_ALIVE; 1932 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1933 1934 /* delete the entry in spacqtree */ 1935 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1936 struct secspacq *spacq = key_getspacq(&spidx); 1937 if (spacq != NULL) { 1938 /* reset counter in order to deletion by timehandler. */ 1939 spacq->created = time_second; 1940 spacq->count = 0; 1941 SPACQ_UNLOCK(); 1942 } 1943 } 1944 1945 { 1946 struct mbuf *n, *mpolicy; 1947 struct sadb_msg *newmsg; 1948 int off; 1949 1950 /* 1951 * Note: do not send SADB_X_EXT_NAT_T_* here: 1952 * we are sending traffic endpoints. 1953 */ 1954 1955 /* create new sadb_msg to reply. */ 1956 if (lft) { 1957 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1958 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1959 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1960 } else { 1961 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1962 SADB_X_EXT_POLICY, 1963 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1964 } 1965 if (!n) 1966 return key_senderror(so, m, ENOBUFS); 1967 1968 if (n->m_len < sizeof(*newmsg)) { 1969 n = m_pullup(n, sizeof(*newmsg)); 1970 if (!n) 1971 return key_senderror(so, m, ENOBUFS); 1972 } 1973 newmsg = mtod(n, struct sadb_msg *); 1974 newmsg->sadb_msg_errno = 0; 1975 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1976 1977 off = 0; 1978 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1979 sizeof(*xpl), &off); 1980 if (mpolicy == NULL) { 1981 /* n is already freed */ 1982 return key_senderror(so, m, ENOBUFS); 1983 } 1984 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1985 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1986 m_freem(n); 1987 return key_senderror(so, m, EINVAL); 1988 } 1989 xpl->sadb_x_policy_id = newsp->id; 1990 1991 m_freem(m); 1992 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1993 } 1994 } 1995 1996 /* 1997 * get new policy id. 1998 * OUT: 1999 * 0: failure. 2000 * others: success. 2001 */ 2002 static u_int32_t 2003 key_getnewspid() 2004 { 2005 u_int32_t newid = 0; 2006 int count = V_key_spi_trycnt; /* XXX */ 2007 struct secpolicy *sp; 2008 2009 /* when requesting to allocate spi ranged */ 2010 while (count--) { 2011 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2012 2013 if ((sp = key_getspbyid(newid)) == NULL) 2014 break; 2015 2016 KEY_FREESP(&sp); 2017 } 2018 2019 if (count == 0 || newid == 0) { 2020 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2021 __func__)); 2022 return 0; 2023 } 2024 2025 return newid; 2026 } 2027 2028 /* 2029 * SADB_SPDDELETE processing 2030 * receive 2031 * <base, address(SD), policy(*)> 2032 * from the user(?), and set SADB_SASTATE_DEAD, 2033 * and send, 2034 * <base, address(SD), policy(*)> 2035 * to the ikmpd. 2036 * policy(*) including direction of policy. 2037 * 2038 * m will always be freed. 2039 */ 2040 static int 2041 key_spddelete(struct socket *so, struct mbuf *m, 2042 const struct sadb_msghdr *mhp) 2043 { 2044 struct sadb_address *src0, *dst0; 2045 struct sadb_x_policy *xpl0; 2046 struct secpolicyindex spidx; 2047 struct secpolicy *sp; 2048 2049 IPSEC_ASSERT(so != NULL, ("null so")); 2050 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2051 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2052 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2053 2054 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2055 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2056 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2057 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2058 __func__)); 2059 return key_senderror(so, m, EINVAL); 2060 } 2061 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2062 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2063 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2064 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2065 __func__)); 2066 return key_senderror(so, m, EINVAL); 2067 } 2068 2069 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2070 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2071 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2072 2073 /* 2074 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2075 * we are processing traffic endpoints. 2076 */ 2077 2078 /* make secindex */ 2079 /* XXX boundary check against sa_len */ 2080 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2081 src0 + 1, 2082 dst0 + 1, 2083 src0->sadb_address_prefixlen, 2084 dst0->sadb_address_prefixlen, 2085 src0->sadb_address_proto, 2086 &spidx); 2087 2088 /* checking the direciton. */ 2089 switch (xpl0->sadb_x_policy_dir) { 2090 case IPSEC_DIR_INBOUND: 2091 case IPSEC_DIR_OUTBOUND: 2092 break; 2093 default: 2094 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2095 return key_senderror(so, m, EINVAL); 2096 } 2097 2098 /* Is there SP in SPD ? */ 2099 if ((sp = key_getsp(&spidx)) == NULL) { 2100 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2101 return key_senderror(so, m, EINVAL); 2102 } 2103 2104 /* save policy id to buffer to be returned. */ 2105 xpl0->sadb_x_policy_id = sp->id; 2106 2107 SPTREE_LOCK(); 2108 sp->state = IPSEC_SPSTATE_DEAD; 2109 SPTREE_UNLOCK(); 2110 KEY_FREESP(&sp); 2111 2112 { 2113 struct mbuf *n; 2114 struct sadb_msg *newmsg; 2115 2116 /* 2117 * Note: do not send SADB_X_EXT_NAT_T_* here: 2118 * we are sending traffic endpoints. 2119 */ 2120 2121 /* create new sadb_msg to reply. */ 2122 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2123 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2124 if (!n) 2125 return key_senderror(so, m, ENOBUFS); 2126 2127 newmsg = mtod(n, struct sadb_msg *); 2128 newmsg->sadb_msg_errno = 0; 2129 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2130 2131 m_freem(m); 2132 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2133 } 2134 } 2135 2136 /* 2137 * SADB_SPDDELETE2 processing 2138 * receive 2139 * <base, policy(*)> 2140 * from the user(?), and set SADB_SASTATE_DEAD, 2141 * and send, 2142 * <base, policy(*)> 2143 * to the ikmpd. 2144 * policy(*) including direction of policy. 2145 * 2146 * m will always be freed. 2147 */ 2148 static int 2149 key_spddelete2(struct socket *so, struct mbuf *m, 2150 const struct sadb_msghdr *mhp) 2151 { 2152 u_int32_t id; 2153 struct secpolicy *sp; 2154 2155 IPSEC_ASSERT(so != NULL, ("null socket")); 2156 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2157 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2158 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2159 2160 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2161 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2162 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2163 return key_senderror(so, m, EINVAL); 2164 } 2165 2166 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2167 2168 /* Is there SP in SPD ? */ 2169 if ((sp = key_getspbyid(id)) == NULL) { 2170 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2171 return key_senderror(so, m, EINVAL); 2172 } 2173 2174 SPTREE_LOCK(); 2175 sp->state = IPSEC_SPSTATE_DEAD; 2176 SPTREE_UNLOCK(); 2177 KEY_FREESP(&sp); 2178 2179 { 2180 struct mbuf *n, *nn; 2181 struct sadb_msg *newmsg; 2182 int off, len; 2183 2184 /* create new sadb_msg to reply. */ 2185 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2186 2187 MGETHDR(n, M_NOWAIT, MT_DATA); 2188 if (n && len > MHLEN) { 2189 MCLGET(n, M_NOWAIT); 2190 if ((n->m_flags & M_EXT) == 0) { 2191 m_freem(n); 2192 n = NULL; 2193 } 2194 } 2195 if (!n) 2196 return key_senderror(so, m, ENOBUFS); 2197 2198 n->m_len = len; 2199 n->m_next = NULL; 2200 off = 0; 2201 2202 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2203 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2204 2205 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2206 off, len)); 2207 2208 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2209 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT); 2210 if (!n->m_next) { 2211 m_freem(n); 2212 return key_senderror(so, m, ENOBUFS); 2213 } 2214 2215 n->m_pkthdr.len = 0; 2216 for (nn = n; nn; nn = nn->m_next) 2217 n->m_pkthdr.len += nn->m_len; 2218 2219 newmsg = mtod(n, struct sadb_msg *); 2220 newmsg->sadb_msg_errno = 0; 2221 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2222 2223 m_freem(m); 2224 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2225 } 2226 } 2227 2228 /* 2229 * SADB_X_SPDGET processing 2230 * receive 2231 * <base, policy(*)> 2232 * from the user(?), 2233 * and send, 2234 * <base, address(SD), policy> 2235 * to the ikmpd. 2236 * policy(*) including direction of policy. 2237 * 2238 * m will always be freed. 2239 */ 2240 static int 2241 key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2242 { 2243 u_int32_t id; 2244 struct secpolicy *sp; 2245 struct mbuf *n; 2246 2247 IPSEC_ASSERT(so != NULL, ("null socket")); 2248 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2249 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2250 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2251 2252 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2253 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2254 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2255 __func__)); 2256 return key_senderror(so, m, EINVAL); 2257 } 2258 2259 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2260 2261 /* Is there SP in SPD ? */ 2262 if ((sp = key_getspbyid(id)) == NULL) { 2263 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2264 return key_senderror(so, m, ENOENT); 2265 } 2266 2267 n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq, 2268 mhp->msg->sadb_msg_pid); 2269 KEY_FREESP(&sp); 2270 if (n != NULL) { 2271 m_freem(m); 2272 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2273 } else 2274 return key_senderror(so, m, ENOBUFS); 2275 } 2276 2277 /* 2278 * SADB_X_SPDACQUIRE processing. 2279 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2280 * send 2281 * <base, policy(*)> 2282 * to KMD, and expect to receive 2283 * <base> with SADB_X_SPDACQUIRE if error occured, 2284 * or 2285 * <base, policy> 2286 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2287 * policy(*) is without policy requests. 2288 * 2289 * 0 : succeed 2290 * others: error number 2291 */ 2292 int 2293 key_spdacquire(struct secpolicy *sp) 2294 { 2295 struct mbuf *result = NULL, *m; 2296 struct secspacq *newspacq; 2297 2298 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2299 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2300 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2301 ("policy not IPSEC %u", sp->policy)); 2302 2303 /* Get an entry to check whether sent message or not. */ 2304 newspacq = key_getspacq(&sp->spidx); 2305 if (newspacq != NULL) { 2306 if (V_key_blockacq_count < newspacq->count) { 2307 /* reset counter and do send message. */ 2308 newspacq->count = 0; 2309 } else { 2310 /* increment counter and do nothing. */ 2311 newspacq->count++; 2312 SPACQ_UNLOCK(); 2313 return (0); 2314 } 2315 SPACQ_UNLOCK(); 2316 } else { 2317 /* make new entry for blocking to send SADB_ACQUIRE. */ 2318 newspacq = key_newspacq(&sp->spidx); 2319 if (newspacq == NULL) 2320 return ENOBUFS; 2321 } 2322 2323 /* create new sadb_msg to reply. */ 2324 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2325 if (!m) 2326 return ENOBUFS; 2327 2328 result = m; 2329 2330 result->m_pkthdr.len = 0; 2331 for (m = result; m; m = m->m_next) 2332 result->m_pkthdr.len += m->m_len; 2333 2334 mtod(result, struct sadb_msg *)->sadb_msg_len = 2335 PFKEY_UNIT64(result->m_pkthdr.len); 2336 2337 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2338 } 2339 2340 /* 2341 * SADB_SPDFLUSH processing 2342 * receive 2343 * <base> 2344 * from the user, and free all entries in secpctree. 2345 * and send, 2346 * <base> 2347 * to the user. 2348 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2349 * 2350 * m will always be freed. 2351 */ 2352 static int 2353 key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2354 { 2355 struct sadb_msg *newmsg; 2356 struct secpolicy *sp; 2357 u_int dir; 2358 2359 IPSEC_ASSERT(so != NULL, ("null socket")); 2360 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2361 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2362 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2363 2364 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2365 return key_senderror(so, m, EINVAL); 2366 2367 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2368 SPTREE_LOCK(); 2369 LIST_FOREACH(sp, &V_sptree[dir], chain) 2370 sp->state = IPSEC_SPSTATE_DEAD; 2371 SPTREE_UNLOCK(); 2372 } 2373 2374 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2375 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2376 return key_senderror(so, m, ENOBUFS); 2377 } 2378 2379 if (m->m_next) 2380 m_freem(m->m_next); 2381 m->m_next = NULL; 2382 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2383 newmsg = mtod(m, struct sadb_msg *); 2384 newmsg->sadb_msg_errno = 0; 2385 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2386 2387 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2388 } 2389 2390 /* 2391 * SADB_SPDDUMP processing 2392 * receive 2393 * <base> 2394 * from the user, and dump all SP leaves 2395 * and send, 2396 * <base> ..... 2397 * to the ikmpd. 2398 * 2399 * m will always be freed. 2400 */ 2401 static int 2402 key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2403 { 2404 struct secpolicy *sp; 2405 int cnt; 2406 u_int dir; 2407 struct mbuf *n; 2408 2409 IPSEC_ASSERT(so != NULL, ("null socket")); 2410 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2411 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2412 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2413 2414 /* search SPD entry and get buffer size. */ 2415 cnt = 0; 2416 SPTREE_LOCK(); 2417 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2418 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2419 cnt++; 2420 } 2421 } 2422 2423 if (cnt == 0) { 2424 SPTREE_UNLOCK(); 2425 return key_senderror(so, m, ENOENT); 2426 } 2427 2428 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2429 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2430 --cnt; 2431 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2432 mhp->msg->sadb_msg_pid); 2433 2434 if (n) 2435 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2436 } 2437 } 2438 2439 SPTREE_UNLOCK(); 2440 m_freem(m); 2441 return 0; 2442 } 2443 2444 static struct mbuf * 2445 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, 2446 u_int32_t pid) 2447 { 2448 struct mbuf *result = NULL, *m; 2449 struct seclifetime lt; 2450 2451 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2452 if (!m) 2453 goto fail; 2454 result = m; 2455 2456 /* 2457 * Note: do not send SADB_X_EXT_NAT_T_* here: 2458 * we are sending traffic endpoints. 2459 */ 2460 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2461 &sp->spidx.src.sa, sp->spidx.prefs, 2462 sp->spidx.ul_proto); 2463 if (!m) 2464 goto fail; 2465 m_cat(result, m); 2466 2467 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2468 &sp->spidx.dst.sa, sp->spidx.prefd, 2469 sp->spidx.ul_proto); 2470 if (!m) 2471 goto fail; 2472 m_cat(result, m); 2473 2474 m = key_sp2msg(sp); 2475 if (!m) 2476 goto fail; 2477 m_cat(result, m); 2478 2479 if(sp->lifetime){ 2480 lt.addtime=sp->created; 2481 lt.usetime= sp->lastused; 2482 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2483 if (!m) 2484 goto fail; 2485 m_cat(result, m); 2486 2487 lt.addtime=sp->lifetime; 2488 lt.usetime= sp->validtime; 2489 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2490 if (!m) 2491 goto fail; 2492 m_cat(result, m); 2493 } 2494 2495 if ((result->m_flags & M_PKTHDR) == 0) 2496 goto fail; 2497 2498 if (result->m_len < sizeof(struct sadb_msg)) { 2499 result = m_pullup(result, sizeof(struct sadb_msg)); 2500 if (result == NULL) 2501 goto fail; 2502 } 2503 2504 result->m_pkthdr.len = 0; 2505 for (m = result; m; m = m->m_next) 2506 result->m_pkthdr.len += m->m_len; 2507 2508 mtod(result, struct sadb_msg *)->sadb_msg_len = 2509 PFKEY_UNIT64(result->m_pkthdr.len); 2510 2511 return result; 2512 2513 fail: 2514 m_freem(result); 2515 return NULL; 2516 } 2517 2518 /* 2519 * get PFKEY message length for security policy and request. 2520 */ 2521 static u_int 2522 key_getspreqmsglen(struct secpolicy *sp) 2523 { 2524 u_int tlen; 2525 2526 tlen = sizeof(struct sadb_x_policy); 2527 2528 /* if is the policy for ipsec ? */ 2529 if (sp->policy != IPSEC_POLICY_IPSEC) 2530 return tlen; 2531 2532 /* get length of ipsec requests */ 2533 { 2534 struct ipsecrequest *isr; 2535 int len; 2536 2537 for (isr = sp->req; isr != NULL; isr = isr->next) { 2538 len = sizeof(struct sadb_x_ipsecrequest) 2539 + isr->saidx.src.sa.sa_len 2540 + isr->saidx.dst.sa.sa_len; 2541 2542 tlen += PFKEY_ALIGN8(len); 2543 } 2544 } 2545 2546 return tlen; 2547 } 2548 2549 /* 2550 * SADB_SPDEXPIRE processing 2551 * send 2552 * <base, address(SD), lifetime(CH), policy> 2553 * to KMD by PF_KEY. 2554 * 2555 * OUT: 0 : succeed 2556 * others : error number 2557 */ 2558 static int 2559 key_spdexpire(struct secpolicy *sp) 2560 { 2561 struct mbuf *result = NULL, *m; 2562 int len; 2563 int error = -1; 2564 struct sadb_lifetime *lt; 2565 2566 /* XXX: Why do we lock ? */ 2567 2568 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2569 2570 /* set msg header */ 2571 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2572 if (!m) { 2573 error = ENOBUFS; 2574 goto fail; 2575 } 2576 result = m; 2577 2578 /* create lifetime extension (current and hard) */ 2579 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2580 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 2581 if (m == NULL) { 2582 error = ENOBUFS; 2583 goto fail; 2584 } 2585 m_align(m, len); 2586 m->m_len = len; 2587 bzero(mtod(m, caddr_t), len); 2588 lt = mtod(m, struct sadb_lifetime *); 2589 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2590 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2591 lt->sadb_lifetime_allocations = 0; 2592 lt->sadb_lifetime_bytes = 0; 2593 lt->sadb_lifetime_addtime = sp->created; 2594 lt->sadb_lifetime_usetime = sp->lastused; 2595 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2596 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2597 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2598 lt->sadb_lifetime_allocations = 0; 2599 lt->sadb_lifetime_bytes = 0; 2600 lt->sadb_lifetime_addtime = sp->lifetime; 2601 lt->sadb_lifetime_usetime = sp->validtime; 2602 m_cat(result, m); 2603 2604 /* 2605 * Note: do not send SADB_X_EXT_NAT_T_* here: 2606 * we are sending traffic endpoints. 2607 */ 2608 2609 /* set sadb_address for source */ 2610 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2611 &sp->spidx.src.sa, 2612 sp->spidx.prefs, sp->spidx.ul_proto); 2613 if (!m) { 2614 error = ENOBUFS; 2615 goto fail; 2616 } 2617 m_cat(result, m); 2618 2619 /* set sadb_address for destination */ 2620 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2621 &sp->spidx.dst.sa, 2622 sp->spidx.prefd, sp->spidx.ul_proto); 2623 if (!m) { 2624 error = ENOBUFS; 2625 goto fail; 2626 } 2627 m_cat(result, m); 2628 2629 /* set secpolicy */ 2630 m = key_sp2msg(sp); 2631 if (!m) { 2632 error = ENOBUFS; 2633 goto fail; 2634 } 2635 m_cat(result, m); 2636 2637 if ((result->m_flags & M_PKTHDR) == 0) { 2638 error = EINVAL; 2639 goto fail; 2640 } 2641 2642 if (result->m_len < sizeof(struct sadb_msg)) { 2643 result = m_pullup(result, sizeof(struct sadb_msg)); 2644 if (result == NULL) { 2645 error = ENOBUFS; 2646 goto fail; 2647 } 2648 } 2649 2650 result->m_pkthdr.len = 0; 2651 for (m = result; m; m = m->m_next) 2652 result->m_pkthdr.len += m->m_len; 2653 2654 mtod(result, struct sadb_msg *)->sadb_msg_len = 2655 PFKEY_UNIT64(result->m_pkthdr.len); 2656 2657 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2658 2659 fail: 2660 if (result) 2661 m_freem(result); 2662 return error; 2663 } 2664 2665 /* %%% SAD management */ 2666 /* 2667 * allocating a memory for new SA head, and copy from the values of mhp. 2668 * OUT: NULL : failure due to the lack of memory. 2669 * others : pointer to new SA head. 2670 */ 2671 static struct secashead * 2672 key_newsah(struct secasindex *saidx) 2673 { 2674 struct secashead *newsah; 2675 2676 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2677 2678 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2679 if (newsah != NULL) { 2680 int i; 2681 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2682 LIST_INIT(&newsah->savtree[i]); 2683 newsah->saidx = *saidx; 2684 2685 /* add to saidxtree */ 2686 newsah->state = SADB_SASTATE_MATURE; 2687 2688 SAHTREE_LOCK(); 2689 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2690 SAHTREE_UNLOCK(); 2691 } 2692 return(newsah); 2693 } 2694 2695 /* 2696 * delete SA index and all SA registerd. 2697 */ 2698 static void 2699 key_delsah(struct secashead *sah) 2700 { 2701 struct secasvar *sav, *nextsav; 2702 u_int stateidx; 2703 int zombie = 0; 2704 2705 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2706 SAHTREE_LOCK_ASSERT(); 2707 2708 /* searching all SA registerd in the secindex. */ 2709 for (stateidx = 0; 2710 stateidx < _ARRAYLEN(saorder_state_any); 2711 stateidx++) { 2712 u_int state = saorder_state_any[stateidx]; 2713 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2714 if (sav->refcnt == 0) { 2715 /* sanity check */ 2716 KEY_CHKSASTATE(state, sav->state, __func__); 2717 /* 2718 * do NOT call KEY_FREESAV here: 2719 * it will only delete the sav if refcnt == 1, 2720 * where we already know that refcnt == 0 2721 */ 2722 key_delsav(sav); 2723 } else { 2724 /* give up to delete this sa */ 2725 zombie++; 2726 } 2727 } 2728 } 2729 if (!zombie) { /* delete only if there are savs */ 2730 /* remove from tree of SA index */ 2731 if (__LIST_CHAINED(sah)) 2732 LIST_REMOVE(sah, chain); 2733 free(sah, M_IPSEC_SAH); 2734 } 2735 } 2736 2737 /* 2738 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2739 * and copy the values of mhp into new buffer. 2740 * When SAD message type is GETSPI: 2741 * to set sequence number from acq_seq++, 2742 * to set zero to SPI. 2743 * not to call key_setsava(). 2744 * OUT: NULL : fail 2745 * others : pointer to new secasvar. 2746 * 2747 * does not modify mbuf. does not free mbuf on error. 2748 */ 2749 static struct secasvar * 2750 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, 2751 struct secashead *sah, int *errp, const char *where, int tag) 2752 { 2753 struct secasvar *newsav; 2754 const struct sadb_sa *xsa; 2755 2756 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2757 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2758 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2759 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2760 2761 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2762 if (newsav == NULL) { 2763 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2764 *errp = ENOBUFS; 2765 goto done; 2766 } 2767 2768 switch (mhp->msg->sadb_msg_type) { 2769 case SADB_GETSPI: 2770 newsav->spi = 0; 2771 2772 #ifdef IPSEC_DOSEQCHECK 2773 /* sync sequence number */ 2774 if (mhp->msg->sadb_msg_seq == 0) 2775 newsav->seq = 2776 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2777 else 2778 #endif 2779 newsav->seq = mhp->msg->sadb_msg_seq; 2780 break; 2781 2782 case SADB_ADD: 2783 /* sanity check */ 2784 if (mhp->ext[SADB_EXT_SA] == NULL) { 2785 free(newsav, M_IPSEC_SA); 2786 newsav = NULL; 2787 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2788 __func__)); 2789 *errp = EINVAL; 2790 goto done; 2791 } 2792 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2793 newsav->spi = xsa->sadb_sa_spi; 2794 newsav->seq = mhp->msg->sadb_msg_seq; 2795 break; 2796 default: 2797 free(newsav, M_IPSEC_SA); 2798 newsav = NULL; 2799 *errp = EINVAL; 2800 goto done; 2801 } 2802 2803 2804 /* copy sav values */ 2805 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2806 *errp = key_setsaval(newsav, m, mhp); 2807 if (*errp) { 2808 free(newsav, M_IPSEC_SA); 2809 newsav = NULL; 2810 goto done; 2811 } 2812 } 2813 2814 SECASVAR_LOCK_INIT(newsav); 2815 2816 /* reset created */ 2817 newsav->created = time_second; 2818 newsav->pid = mhp->msg->sadb_msg_pid; 2819 2820 /* add to satree */ 2821 newsav->sah = sah; 2822 sa_initref(newsav); 2823 newsav->state = SADB_SASTATE_LARVAL; 2824 2825 SAHTREE_LOCK(); 2826 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2827 secasvar, chain); 2828 SAHTREE_UNLOCK(); 2829 done: 2830 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2831 printf("DP %s from %s:%u return SP:%p\n", __func__, 2832 where, tag, newsav)); 2833 2834 return newsav; 2835 } 2836 2837 /* 2838 * free() SA variable entry. 2839 */ 2840 static void 2841 key_cleansav(struct secasvar *sav) 2842 { 2843 /* 2844 * Cleanup xform state. Note that zeroize'ing causes the 2845 * keys to be cleared; otherwise we must do it ourself. 2846 */ 2847 if (sav->tdb_xform != NULL) { 2848 sav->tdb_xform->xf_zeroize(sav); 2849 sav->tdb_xform = NULL; 2850 } else { 2851 KASSERT(sav->iv == NULL, ("iv but no xform")); 2852 if (sav->key_auth != NULL) 2853 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2854 if (sav->key_enc != NULL) 2855 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2856 } 2857 if (sav->key_auth != NULL) { 2858 if (sav->key_auth->key_data != NULL) 2859 free(sav->key_auth->key_data, M_IPSEC_MISC); 2860 free(sav->key_auth, M_IPSEC_MISC); 2861 sav->key_auth = NULL; 2862 } 2863 if (sav->key_enc != NULL) { 2864 if (sav->key_enc->key_data != NULL) 2865 free(sav->key_enc->key_data, M_IPSEC_MISC); 2866 free(sav->key_enc, M_IPSEC_MISC); 2867 sav->key_enc = NULL; 2868 } 2869 if (sav->sched) { 2870 bzero(sav->sched, sav->schedlen); 2871 free(sav->sched, M_IPSEC_MISC); 2872 sav->sched = NULL; 2873 } 2874 if (sav->replay != NULL) { 2875 free(sav->replay, M_IPSEC_MISC); 2876 sav->replay = NULL; 2877 } 2878 if (sav->lft_c != NULL) { 2879 free(sav->lft_c, M_IPSEC_MISC); 2880 sav->lft_c = NULL; 2881 } 2882 if (sav->lft_h != NULL) { 2883 free(sav->lft_h, M_IPSEC_MISC); 2884 sav->lft_h = NULL; 2885 } 2886 if (sav->lft_s != NULL) { 2887 free(sav->lft_s, M_IPSEC_MISC); 2888 sav->lft_s = NULL; 2889 } 2890 } 2891 2892 /* 2893 * free() SA variable entry. 2894 */ 2895 static void 2896 key_delsav(struct secasvar *sav) 2897 { 2898 IPSEC_ASSERT(sav != NULL, ("null sav")); 2899 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2900 2901 /* remove from SA header */ 2902 if (__LIST_CHAINED(sav)) 2903 LIST_REMOVE(sav, chain); 2904 key_cleansav(sav); 2905 SECASVAR_LOCK_DESTROY(sav); 2906 free(sav, M_IPSEC_SA); 2907 } 2908 2909 /* 2910 * search SAD. 2911 * OUT: 2912 * NULL : not found 2913 * others : found, pointer to a SA. 2914 */ 2915 static struct secashead * 2916 key_getsah(struct secasindex *saidx) 2917 { 2918 struct secashead *sah; 2919 2920 SAHTREE_LOCK(); 2921 LIST_FOREACH(sah, &V_sahtree, chain) { 2922 if (sah->state == SADB_SASTATE_DEAD) 2923 continue; 2924 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2925 break; 2926 } 2927 SAHTREE_UNLOCK(); 2928 2929 return sah; 2930 } 2931 2932 /* 2933 * check not to be duplicated SPI. 2934 * NOTE: this function is too slow due to searching all SAD. 2935 * OUT: 2936 * NULL : not found 2937 * others : found, pointer to a SA. 2938 */ 2939 static struct secasvar * 2940 key_checkspidup(struct secasindex *saidx, u_int32_t spi) 2941 { 2942 struct secashead *sah; 2943 struct secasvar *sav; 2944 2945 /* check address family */ 2946 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2947 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2948 __func__)); 2949 return NULL; 2950 } 2951 2952 sav = NULL; 2953 /* check all SAD */ 2954 SAHTREE_LOCK(); 2955 LIST_FOREACH(sah, &V_sahtree, chain) { 2956 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2957 continue; 2958 sav = key_getsavbyspi(sah, spi); 2959 if (sav != NULL) 2960 break; 2961 } 2962 SAHTREE_UNLOCK(); 2963 2964 return sav; 2965 } 2966 2967 /* 2968 * search SAD litmited alive SA, protocol, SPI. 2969 * OUT: 2970 * NULL : not found 2971 * others : found, pointer to a SA. 2972 */ 2973 static struct secasvar * 2974 key_getsavbyspi(struct secashead *sah, u_int32_t spi) 2975 { 2976 struct secasvar *sav; 2977 u_int stateidx, state; 2978 2979 sav = NULL; 2980 SAHTREE_LOCK_ASSERT(); 2981 /* search all status */ 2982 for (stateidx = 0; 2983 stateidx < _ARRAYLEN(saorder_state_alive); 2984 stateidx++) { 2985 2986 state = saorder_state_alive[stateidx]; 2987 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2988 2989 /* sanity check */ 2990 if (sav->state != state) { 2991 ipseclog((LOG_DEBUG, "%s: " 2992 "invalid sav->state (queue: %d SA: %d)\n", 2993 __func__, state, sav->state)); 2994 continue; 2995 } 2996 2997 if (sav->spi == spi) 2998 return sav; 2999 } 3000 } 3001 3002 return NULL; 3003 } 3004 3005 /* 3006 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3007 * You must update these if need. 3008 * OUT: 0: success. 3009 * !0: failure. 3010 * 3011 * does not modify mbuf. does not free mbuf on error. 3012 */ 3013 static int 3014 key_setsaval(struct secasvar *sav, struct mbuf *m, 3015 const struct sadb_msghdr *mhp) 3016 { 3017 int error = 0; 3018 3019 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3020 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3021 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3022 3023 /* initialization */ 3024 sav->replay = NULL; 3025 sav->key_auth = NULL; 3026 sav->key_enc = NULL; 3027 sav->sched = NULL; 3028 sav->schedlen = 0; 3029 sav->iv = NULL; 3030 sav->lft_c = NULL; 3031 sav->lft_h = NULL; 3032 sav->lft_s = NULL; 3033 sav->tdb_xform = NULL; /* transform */ 3034 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3035 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3036 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3037 /* Initialize even if NAT-T not compiled in: */ 3038 sav->natt_type = 0; 3039 sav->natt_esp_frag_len = 0; 3040 3041 /* SA */ 3042 if (mhp->ext[SADB_EXT_SA] != NULL) { 3043 const struct sadb_sa *sa0; 3044 3045 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3046 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3047 error = EINVAL; 3048 goto fail; 3049 } 3050 3051 sav->alg_auth = sa0->sadb_sa_auth; 3052 sav->alg_enc = sa0->sadb_sa_encrypt; 3053 sav->flags = sa0->sadb_sa_flags; 3054 3055 /* replay window */ 3056 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3057 sav->replay = (struct secreplay *) 3058 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3059 if (sav->replay == NULL) { 3060 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3061 __func__)); 3062 error = ENOBUFS; 3063 goto fail; 3064 } 3065 if (sa0->sadb_sa_replay != 0) 3066 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3067 sav->replay->wsize = sa0->sadb_sa_replay; 3068 } 3069 } 3070 3071 /* Authentication keys */ 3072 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3073 const struct sadb_key *key0; 3074 int len; 3075 3076 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3077 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3078 3079 error = 0; 3080 if (len < sizeof(*key0)) { 3081 error = EINVAL; 3082 goto fail; 3083 } 3084 switch (mhp->msg->sadb_msg_satype) { 3085 case SADB_SATYPE_AH: 3086 case SADB_SATYPE_ESP: 3087 case SADB_X_SATYPE_TCPSIGNATURE: 3088 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3089 sav->alg_auth != SADB_X_AALG_NULL) 3090 error = EINVAL; 3091 break; 3092 case SADB_X_SATYPE_IPCOMP: 3093 default: 3094 error = EINVAL; 3095 break; 3096 } 3097 if (error) { 3098 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3099 __func__)); 3100 goto fail; 3101 } 3102 3103 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3104 M_IPSEC_MISC); 3105 if (sav->key_auth == NULL ) { 3106 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3107 __func__)); 3108 error = ENOBUFS; 3109 goto fail; 3110 } 3111 } 3112 3113 /* Encryption key */ 3114 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3115 const struct sadb_key *key0; 3116 int len; 3117 3118 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3119 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3120 3121 error = 0; 3122 if (len < sizeof(*key0)) { 3123 error = EINVAL; 3124 goto fail; 3125 } 3126 switch (mhp->msg->sadb_msg_satype) { 3127 case SADB_SATYPE_ESP: 3128 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3129 sav->alg_enc != SADB_EALG_NULL) { 3130 error = EINVAL; 3131 break; 3132 } 3133 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3134 len, 3135 M_IPSEC_MISC); 3136 if (sav->key_enc == NULL) { 3137 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3138 __func__)); 3139 error = ENOBUFS; 3140 goto fail; 3141 } 3142 break; 3143 case SADB_X_SATYPE_IPCOMP: 3144 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3145 error = EINVAL; 3146 sav->key_enc = NULL; /*just in case*/ 3147 break; 3148 case SADB_SATYPE_AH: 3149 case SADB_X_SATYPE_TCPSIGNATURE: 3150 default: 3151 error = EINVAL; 3152 break; 3153 } 3154 if (error) { 3155 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3156 __func__)); 3157 goto fail; 3158 } 3159 } 3160 3161 /* set iv */ 3162 sav->ivlen = 0; 3163 3164 switch (mhp->msg->sadb_msg_satype) { 3165 case SADB_SATYPE_AH: 3166 error = xform_init(sav, XF_AH); 3167 break; 3168 case SADB_SATYPE_ESP: 3169 error = xform_init(sav, XF_ESP); 3170 break; 3171 case SADB_X_SATYPE_IPCOMP: 3172 error = xform_init(sav, XF_IPCOMP); 3173 break; 3174 case SADB_X_SATYPE_TCPSIGNATURE: 3175 error = xform_init(sav, XF_TCPSIGNATURE); 3176 break; 3177 } 3178 if (error) { 3179 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3180 __func__, mhp->msg->sadb_msg_satype)); 3181 goto fail; 3182 } 3183 3184 /* reset created */ 3185 sav->created = time_second; 3186 3187 /* make lifetime for CURRENT */ 3188 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3189 if (sav->lft_c == NULL) { 3190 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3191 error = ENOBUFS; 3192 goto fail; 3193 } 3194 3195 sav->lft_c->allocations = 0; 3196 sav->lft_c->bytes = 0; 3197 sav->lft_c->addtime = time_second; 3198 sav->lft_c->usetime = 0; 3199 3200 /* lifetimes for HARD and SOFT */ 3201 { 3202 const struct sadb_lifetime *lft0; 3203 3204 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3205 if (lft0 != NULL) { 3206 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3207 error = EINVAL; 3208 goto fail; 3209 } 3210 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3211 if (sav->lft_h == NULL) { 3212 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3213 error = ENOBUFS; 3214 goto fail; 3215 } 3216 /* to be initialize ? */ 3217 } 3218 3219 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3220 if (lft0 != NULL) { 3221 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3222 error = EINVAL; 3223 goto fail; 3224 } 3225 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3226 if (sav->lft_s == NULL) { 3227 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3228 error = ENOBUFS; 3229 goto fail; 3230 } 3231 /* to be initialize ? */ 3232 } 3233 } 3234 3235 return 0; 3236 3237 fail: 3238 /* initialization */ 3239 key_cleansav(sav); 3240 3241 return error; 3242 } 3243 3244 /* 3245 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3246 * OUT: 0: valid 3247 * other: errno 3248 */ 3249 static int 3250 key_mature(struct secasvar *sav) 3251 { 3252 int error; 3253 3254 /* check SPI value */ 3255 switch (sav->sah->saidx.proto) { 3256 case IPPROTO_ESP: 3257 case IPPROTO_AH: 3258 /* 3259 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3260 * 1-255 reserved by IANA for future use, 3261 * 0 for implementation specific, local use. 3262 */ 3263 if (ntohl(sav->spi) <= 255) { 3264 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3265 __func__, (u_int32_t)ntohl(sav->spi))); 3266 return EINVAL; 3267 } 3268 break; 3269 } 3270 3271 /* check satype */ 3272 switch (sav->sah->saidx.proto) { 3273 case IPPROTO_ESP: 3274 /* check flags */ 3275 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3276 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3277 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3278 "given to old-esp.\n", __func__)); 3279 return EINVAL; 3280 } 3281 error = xform_init(sav, XF_ESP); 3282 break; 3283 case IPPROTO_AH: 3284 /* check flags */ 3285 if (sav->flags & SADB_X_EXT_DERIV) { 3286 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3287 "given to AH SA.\n", __func__)); 3288 return EINVAL; 3289 } 3290 if (sav->alg_enc != SADB_EALG_NONE) { 3291 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3292 "mismated.\n", __func__)); 3293 return(EINVAL); 3294 } 3295 error = xform_init(sav, XF_AH); 3296 break; 3297 case IPPROTO_IPCOMP: 3298 if (sav->alg_auth != SADB_AALG_NONE) { 3299 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3300 "mismated.\n", __func__)); 3301 return(EINVAL); 3302 } 3303 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3304 && ntohl(sav->spi) >= 0x10000) { 3305 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3306 __func__)); 3307 return(EINVAL); 3308 } 3309 error = xform_init(sav, XF_IPCOMP); 3310 break; 3311 case IPPROTO_TCP: 3312 if (sav->alg_enc != SADB_EALG_NONE) { 3313 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3314 "mismated.\n", __func__)); 3315 return(EINVAL); 3316 } 3317 error = xform_init(sav, XF_TCPSIGNATURE); 3318 break; 3319 default: 3320 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3321 error = EPROTONOSUPPORT; 3322 break; 3323 } 3324 if (error == 0) { 3325 SAHTREE_LOCK(); 3326 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3327 SAHTREE_UNLOCK(); 3328 } 3329 return (error); 3330 } 3331 3332 /* 3333 * subroutine for SADB_GET and SADB_DUMP. 3334 */ 3335 static struct mbuf * 3336 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3337 u_int32_t seq, u_int32_t pid) 3338 { 3339 struct mbuf *result = NULL, *tres = NULL, *m; 3340 int i; 3341 int dumporder[] = { 3342 SADB_EXT_SA, SADB_X_EXT_SA2, 3343 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3344 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3345 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3346 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3347 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3348 #ifdef IPSEC_NAT_T 3349 SADB_X_EXT_NAT_T_TYPE, 3350 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3351 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3352 SADB_X_EXT_NAT_T_FRAG, 3353 #endif 3354 }; 3355 3356 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3357 if (m == NULL) 3358 goto fail; 3359 result = m; 3360 3361 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3362 m = NULL; 3363 switch (dumporder[i]) { 3364 case SADB_EXT_SA: 3365 m = key_setsadbsa(sav); 3366 if (!m) 3367 goto fail; 3368 break; 3369 3370 case SADB_X_EXT_SA2: 3371 m = key_setsadbxsa2(sav->sah->saidx.mode, 3372 sav->replay ? sav->replay->count : 0, 3373 sav->sah->saidx.reqid); 3374 if (!m) 3375 goto fail; 3376 break; 3377 3378 case SADB_EXT_ADDRESS_SRC: 3379 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3380 &sav->sah->saidx.src.sa, 3381 FULLMASK, IPSEC_ULPROTO_ANY); 3382 if (!m) 3383 goto fail; 3384 break; 3385 3386 case SADB_EXT_ADDRESS_DST: 3387 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3388 &sav->sah->saidx.dst.sa, 3389 FULLMASK, IPSEC_ULPROTO_ANY); 3390 if (!m) 3391 goto fail; 3392 break; 3393 3394 case SADB_EXT_KEY_AUTH: 3395 if (!sav->key_auth) 3396 continue; 3397 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3398 if (!m) 3399 goto fail; 3400 break; 3401 3402 case SADB_EXT_KEY_ENCRYPT: 3403 if (!sav->key_enc) 3404 continue; 3405 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3406 if (!m) 3407 goto fail; 3408 break; 3409 3410 case SADB_EXT_LIFETIME_CURRENT: 3411 if (!sav->lft_c) 3412 continue; 3413 m = key_setlifetime(sav->lft_c, 3414 SADB_EXT_LIFETIME_CURRENT); 3415 if (!m) 3416 goto fail; 3417 break; 3418 3419 case SADB_EXT_LIFETIME_HARD: 3420 if (!sav->lft_h) 3421 continue; 3422 m = key_setlifetime(sav->lft_h, 3423 SADB_EXT_LIFETIME_HARD); 3424 if (!m) 3425 goto fail; 3426 break; 3427 3428 case SADB_EXT_LIFETIME_SOFT: 3429 if (!sav->lft_s) 3430 continue; 3431 m = key_setlifetime(sav->lft_s, 3432 SADB_EXT_LIFETIME_SOFT); 3433 3434 if (!m) 3435 goto fail; 3436 break; 3437 3438 #ifdef IPSEC_NAT_T 3439 case SADB_X_EXT_NAT_T_TYPE: 3440 m = key_setsadbxtype(sav->natt_type); 3441 if (!m) 3442 goto fail; 3443 break; 3444 3445 case SADB_X_EXT_NAT_T_DPORT: 3446 m = key_setsadbxport( 3447 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3448 SADB_X_EXT_NAT_T_DPORT); 3449 if (!m) 3450 goto fail; 3451 break; 3452 3453 case SADB_X_EXT_NAT_T_SPORT: 3454 m = key_setsadbxport( 3455 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3456 SADB_X_EXT_NAT_T_SPORT); 3457 if (!m) 3458 goto fail; 3459 break; 3460 3461 case SADB_X_EXT_NAT_T_OAI: 3462 case SADB_X_EXT_NAT_T_OAR: 3463 case SADB_X_EXT_NAT_T_FRAG: 3464 /* We do not (yet) support those. */ 3465 continue; 3466 #endif 3467 3468 case SADB_EXT_ADDRESS_PROXY: 3469 case SADB_EXT_IDENTITY_SRC: 3470 case SADB_EXT_IDENTITY_DST: 3471 /* XXX: should we brought from SPD ? */ 3472 case SADB_EXT_SENSITIVITY: 3473 default: 3474 continue; 3475 } 3476 3477 if (!m) 3478 goto fail; 3479 if (tres) 3480 m_cat(m, tres); 3481 tres = m; 3482 3483 } 3484 3485 m_cat(result, tres); 3486 if (result->m_len < sizeof(struct sadb_msg)) { 3487 result = m_pullup(result, sizeof(struct sadb_msg)); 3488 if (result == NULL) 3489 goto fail; 3490 } 3491 3492 result->m_pkthdr.len = 0; 3493 for (m = result; m; m = m->m_next) 3494 result->m_pkthdr.len += m->m_len; 3495 3496 mtod(result, struct sadb_msg *)->sadb_msg_len = 3497 PFKEY_UNIT64(result->m_pkthdr.len); 3498 3499 return result; 3500 3501 fail: 3502 m_freem(result); 3503 m_freem(tres); 3504 return NULL; 3505 } 3506 3507 /* 3508 * set data into sadb_msg. 3509 */ 3510 static struct mbuf * 3511 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3512 pid_t pid, u_int16_t reserved) 3513 { 3514 struct mbuf *m; 3515 struct sadb_msg *p; 3516 int len; 3517 3518 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3519 if (len > MCLBYTES) 3520 return NULL; 3521 MGETHDR(m, M_NOWAIT, MT_DATA); 3522 if (m && len > MHLEN) { 3523 MCLGET(m, M_NOWAIT); 3524 if ((m->m_flags & M_EXT) == 0) { 3525 m_freem(m); 3526 m = NULL; 3527 } 3528 } 3529 if (!m) 3530 return NULL; 3531 m->m_pkthdr.len = m->m_len = len; 3532 m->m_next = NULL; 3533 3534 p = mtod(m, struct sadb_msg *); 3535 3536 bzero(p, len); 3537 p->sadb_msg_version = PF_KEY_V2; 3538 p->sadb_msg_type = type; 3539 p->sadb_msg_errno = 0; 3540 p->sadb_msg_satype = satype; 3541 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3542 p->sadb_msg_reserved = reserved; 3543 p->sadb_msg_seq = seq; 3544 p->sadb_msg_pid = (u_int32_t)pid; 3545 3546 return m; 3547 } 3548 3549 /* 3550 * copy secasvar data into sadb_address. 3551 */ 3552 static struct mbuf * 3553 key_setsadbsa(struct secasvar *sav) 3554 { 3555 struct mbuf *m; 3556 struct sadb_sa *p; 3557 int len; 3558 3559 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3560 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3561 if (m == NULL) 3562 return (NULL); 3563 m_align(m, len); 3564 m->m_len = len; 3565 p = mtod(m, struct sadb_sa *); 3566 bzero(p, len); 3567 p->sadb_sa_len = PFKEY_UNIT64(len); 3568 p->sadb_sa_exttype = SADB_EXT_SA; 3569 p->sadb_sa_spi = sav->spi; 3570 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3571 p->sadb_sa_state = sav->state; 3572 p->sadb_sa_auth = sav->alg_auth; 3573 p->sadb_sa_encrypt = sav->alg_enc; 3574 p->sadb_sa_flags = sav->flags; 3575 3576 return m; 3577 } 3578 3579 /* 3580 * set data into sadb_address. 3581 */ 3582 static struct mbuf * 3583 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, 3584 u_int8_t prefixlen, u_int16_t ul_proto) 3585 { 3586 struct mbuf *m; 3587 struct sadb_address *p; 3588 size_t len; 3589 3590 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3591 PFKEY_ALIGN8(saddr->sa_len); 3592 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3593 if (m == NULL) 3594 return (NULL); 3595 m_align(m, len); 3596 m->m_len = len; 3597 p = mtod(m, struct sadb_address *); 3598 3599 bzero(p, len); 3600 p->sadb_address_len = PFKEY_UNIT64(len); 3601 p->sadb_address_exttype = exttype; 3602 p->sadb_address_proto = ul_proto; 3603 if (prefixlen == FULLMASK) { 3604 switch (saddr->sa_family) { 3605 case AF_INET: 3606 prefixlen = sizeof(struct in_addr) << 3; 3607 break; 3608 case AF_INET6: 3609 prefixlen = sizeof(struct in6_addr) << 3; 3610 break; 3611 default: 3612 ; /*XXX*/ 3613 } 3614 } 3615 p->sadb_address_prefixlen = prefixlen; 3616 p->sadb_address_reserved = 0; 3617 3618 bcopy(saddr, 3619 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3620 saddr->sa_len); 3621 3622 return m; 3623 } 3624 3625 /* 3626 * set data into sadb_x_sa2. 3627 */ 3628 static struct mbuf * 3629 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3630 { 3631 struct mbuf *m; 3632 struct sadb_x_sa2 *p; 3633 size_t len; 3634 3635 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3636 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3637 if (m == NULL) 3638 return (NULL); 3639 m_align(m, len); 3640 m->m_len = len; 3641 p = mtod(m, struct sadb_x_sa2 *); 3642 3643 bzero(p, len); 3644 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3645 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3646 p->sadb_x_sa2_mode = mode; 3647 p->sadb_x_sa2_reserved1 = 0; 3648 p->sadb_x_sa2_reserved2 = 0; 3649 p->sadb_x_sa2_sequence = seq; 3650 p->sadb_x_sa2_reqid = reqid; 3651 3652 return m; 3653 } 3654 3655 #ifdef IPSEC_NAT_T 3656 /* 3657 * Set a type in sadb_x_nat_t_type. 3658 */ 3659 static struct mbuf * 3660 key_setsadbxtype(u_int16_t type) 3661 { 3662 struct mbuf *m; 3663 size_t len; 3664 struct sadb_x_nat_t_type *p; 3665 3666 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3667 3668 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3669 if (m == NULL) 3670 return (NULL); 3671 m_align(m, len); 3672 m->m_len = len; 3673 p = mtod(m, struct sadb_x_nat_t_type *); 3674 3675 bzero(p, len); 3676 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3677 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3678 p->sadb_x_nat_t_type_type = type; 3679 3680 return (m); 3681 } 3682 /* 3683 * Set a port in sadb_x_nat_t_port. 3684 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3685 */ 3686 static struct mbuf * 3687 key_setsadbxport(u_int16_t port, u_int16_t type) 3688 { 3689 struct mbuf *m; 3690 size_t len; 3691 struct sadb_x_nat_t_port *p; 3692 3693 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3694 3695 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3696 if (m == NULL) 3697 return (NULL); 3698 m_align(m, len); 3699 m->m_len = len; 3700 p = mtod(m, struct sadb_x_nat_t_port *); 3701 3702 bzero(p, len); 3703 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3704 p->sadb_x_nat_t_port_exttype = type; 3705 p->sadb_x_nat_t_port_port = port; 3706 3707 return (m); 3708 } 3709 3710 /* 3711 * Get port from sockaddr. Port is in network byte order. 3712 */ 3713 u_int16_t 3714 key_portfromsaddr(struct sockaddr *sa) 3715 { 3716 3717 switch (sa->sa_family) { 3718 #ifdef INET 3719 case AF_INET: 3720 return ((struct sockaddr_in *)sa)->sin_port; 3721 #endif 3722 #ifdef INET6 3723 case AF_INET6: 3724 return ((struct sockaddr_in6 *)sa)->sin6_port; 3725 #endif 3726 } 3727 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3728 printf("DP %s unexpected address family %d\n", 3729 __func__, sa->sa_family)); 3730 return (0); 3731 } 3732 #endif /* IPSEC_NAT_T */ 3733 3734 /* 3735 * Set port in struct sockaddr. Port is in network byte order. 3736 */ 3737 static void 3738 key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3739 { 3740 3741 switch (sa->sa_family) { 3742 #ifdef INET 3743 case AF_INET: 3744 ((struct sockaddr_in *)sa)->sin_port = port; 3745 break; 3746 #endif 3747 #ifdef INET6 3748 case AF_INET6: 3749 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3750 break; 3751 #endif 3752 default: 3753 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3754 __func__, sa->sa_family)); 3755 break; 3756 } 3757 } 3758 3759 /* 3760 * set data into sadb_x_policy 3761 */ 3762 static struct mbuf * 3763 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3764 { 3765 struct mbuf *m; 3766 struct sadb_x_policy *p; 3767 size_t len; 3768 3769 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3770 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3771 if (m == NULL) 3772 return (NULL); 3773 m_align(m, len); 3774 m->m_len = len; 3775 p = mtod(m, struct sadb_x_policy *); 3776 3777 bzero(p, len); 3778 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3779 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3780 p->sadb_x_policy_type = type; 3781 p->sadb_x_policy_dir = dir; 3782 p->sadb_x_policy_id = id; 3783 3784 return m; 3785 } 3786 3787 /* %%% utilities */ 3788 /* Take a key message (sadb_key) from the socket and turn it into one 3789 * of the kernel's key structures (seckey). 3790 * 3791 * IN: pointer to the src 3792 * OUT: NULL no more memory 3793 */ 3794 struct seckey * 3795 key_dup_keymsg(const struct sadb_key *src, u_int len, 3796 struct malloc_type *type) 3797 { 3798 struct seckey *dst; 3799 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3800 if (dst != NULL) { 3801 dst->bits = src->sadb_key_bits; 3802 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3803 if (dst->key_data != NULL) { 3804 bcopy((const char *)src + sizeof(struct sadb_key), 3805 dst->key_data, len); 3806 } else { 3807 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3808 __func__)); 3809 free(dst, type); 3810 dst = NULL; 3811 } 3812 } else { 3813 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3814 __func__)); 3815 3816 } 3817 return dst; 3818 } 3819 3820 /* Take a lifetime message (sadb_lifetime) passed in on a socket and 3821 * turn it into one of the kernel's lifetime structures (seclifetime). 3822 * 3823 * IN: pointer to the destination, source and malloc type 3824 * OUT: NULL, no more memory 3825 */ 3826 3827 static struct seclifetime * 3828 key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type) 3829 { 3830 struct seclifetime *dst = NULL; 3831 3832 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3833 type, M_NOWAIT); 3834 if (dst == NULL) { 3835 /* XXX counter */ 3836 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3837 } else { 3838 dst->allocations = src->sadb_lifetime_allocations; 3839 dst->bytes = src->sadb_lifetime_bytes; 3840 dst->addtime = src->sadb_lifetime_addtime; 3841 dst->usetime = src->sadb_lifetime_usetime; 3842 } 3843 return dst; 3844 } 3845 3846 /* compare my own address 3847 * OUT: 1: true, i.e. my address. 3848 * 0: false 3849 */ 3850 int 3851 key_ismyaddr(struct sockaddr *sa) 3852 { 3853 3854 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3855 switch (sa->sa_family) { 3856 #ifdef INET 3857 case AF_INET: 3858 return (in_localip(satosin(sa)->sin_addr)); 3859 #endif 3860 #ifdef INET6 3861 case AF_INET6: 3862 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3863 #endif 3864 } 3865 3866 return 0; 3867 } 3868 3869 #ifdef INET6 3870 /* 3871 * compare my own address for IPv6. 3872 * 1: ours 3873 * 0: other 3874 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3875 */ 3876 #include <netinet6/in6_var.h> 3877 3878 static int 3879 key_ismyaddr6(struct sockaddr_in6 *sin6) 3880 { 3881 struct in6_ifaddr *ia; 3882 #if 0 3883 struct in6_multi *in6m; 3884 #endif 3885 3886 IN6_IFADDR_RLOCK(); 3887 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3888 if (key_sockaddrcmp((struct sockaddr *)sin6, 3889 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3890 IN6_IFADDR_RUNLOCK(); 3891 return 1; 3892 } 3893 3894 #if 0 3895 /* 3896 * XXX Multicast 3897 * XXX why do we care about multlicast here while we don't care 3898 * about IPv4 multicast?? 3899 * XXX scope 3900 */ 3901 in6m = NULL; 3902 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3903 if (in6m) { 3904 IN6_IFADDR_RUNLOCK(); 3905 return 1; 3906 } 3907 #endif 3908 } 3909 IN6_IFADDR_RUNLOCK(); 3910 3911 /* loopback, just for safety */ 3912 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3913 return 1; 3914 3915 return 0; 3916 } 3917 #endif /*INET6*/ 3918 3919 /* 3920 * compare two secasindex structure. 3921 * flag can specify to compare 2 saidxes. 3922 * compare two secasindex structure without both mode and reqid. 3923 * don't compare port. 3924 * IN: 3925 * saidx0: source, it can be in SAD. 3926 * saidx1: object. 3927 * OUT: 3928 * 1 : equal 3929 * 0 : not equal 3930 */ 3931 static int 3932 key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1, 3933 int flag) 3934 { 3935 int chkport = 0; 3936 3937 /* sanity */ 3938 if (saidx0 == NULL && saidx1 == NULL) 3939 return 1; 3940 3941 if (saidx0 == NULL || saidx1 == NULL) 3942 return 0; 3943 3944 if (saidx0->proto != saidx1->proto) 3945 return 0; 3946 3947 if (flag == CMP_EXACTLY) { 3948 if (saidx0->mode != saidx1->mode) 3949 return 0; 3950 if (saidx0->reqid != saidx1->reqid) 3951 return 0; 3952 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3953 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3954 return 0; 3955 } else { 3956 3957 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3958 if (flag == CMP_MODE_REQID 3959 ||flag == CMP_REQID) { 3960 /* 3961 * If reqid of SPD is non-zero, unique SA is required. 3962 * The result must be of same reqid in this case. 3963 */ 3964 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3965 return 0; 3966 } 3967 3968 if (flag == CMP_MODE_REQID) { 3969 if (saidx0->mode != IPSEC_MODE_ANY 3970 && saidx0->mode != saidx1->mode) 3971 return 0; 3972 } 3973 3974 #ifdef IPSEC_NAT_T 3975 /* 3976 * If NAT-T is enabled, check ports for tunnel mode. 3977 * Do not check ports if they are set to zero in the SPD. 3978 * Also do not do it for native transport mode, as there 3979 * is no port information available in the SP. 3980 */ 3981 if ((saidx1->mode == IPSEC_MODE_TUNNEL || 3982 (saidx1->mode == IPSEC_MODE_TRANSPORT && 3983 saidx1->proto == IPPROTO_ESP)) && 3984 saidx1->src.sa.sa_family == AF_INET && 3985 saidx1->dst.sa.sa_family == AF_INET && 3986 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 3987 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 3988 chkport = 1; 3989 #endif /* IPSEC_NAT_T */ 3990 3991 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 3992 return 0; 3993 } 3994 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 3995 return 0; 3996 } 3997 } 3998 3999 return 1; 4000 } 4001 4002 /* 4003 * compare two secindex structure exactly. 4004 * IN: 4005 * spidx0: source, it is often in SPD. 4006 * spidx1: object, it is often from PFKEY message. 4007 * OUT: 4008 * 1 : equal 4009 * 0 : not equal 4010 */ 4011 static int 4012 key_cmpspidx_exactly(struct secpolicyindex *spidx0, 4013 struct secpolicyindex *spidx1) 4014 { 4015 /* sanity */ 4016 if (spidx0 == NULL && spidx1 == NULL) 4017 return 1; 4018 4019 if (spidx0 == NULL || spidx1 == NULL) 4020 return 0; 4021 4022 if (spidx0->prefs != spidx1->prefs 4023 || spidx0->prefd != spidx1->prefd 4024 || spidx0->ul_proto != spidx1->ul_proto) 4025 return 0; 4026 4027 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4028 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4029 } 4030 4031 /* 4032 * compare two secindex structure with mask. 4033 * IN: 4034 * spidx0: source, it is often in SPD. 4035 * spidx1: object, it is often from IP header. 4036 * OUT: 4037 * 1 : equal 4038 * 0 : not equal 4039 */ 4040 static int 4041 key_cmpspidx_withmask(struct secpolicyindex *spidx0, 4042 struct secpolicyindex *spidx1) 4043 { 4044 /* sanity */ 4045 if (spidx0 == NULL && spidx1 == NULL) 4046 return 1; 4047 4048 if (spidx0 == NULL || spidx1 == NULL) 4049 return 0; 4050 4051 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4052 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4053 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4054 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4055 return 0; 4056 4057 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4058 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4059 && spidx0->ul_proto != spidx1->ul_proto) 4060 return 0; 4061 4062 switch (spidx0->src.sa.sa_family) { 4063 case AF_INET: 4064 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4065 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4066 return 0; 4067 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4068 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4069 return 0; 4070 break; 4071 case AF_INET6: 4072 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4073 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4074 return 0; 4075 /* 4076 * scope_id check. if sin6_scope_id is 0, we regard it 4077 * as a wildcard scope, which matches any scope zone ID. 4078 */ 4079 if (spidx0->src.sin6.sin6_scope_id && 4080 spidx1->src.sin6.sin6_scope_id && 4081 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4082 return 0; 4083 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4084 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4085 return 0; 4086 break; 4087 default: 4088 /* XXX */ 4089 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4090 return 0; 4091 break; 4092 } 4093 4094 switch (spidx0->dst.sa.sa_family) { 4095 case AF_INET: 4096 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4097 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4098 return 0; 4099 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4100 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4101 return 0; 4102 break; 4103 case AF_INET6: 4104 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4105 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4106 return 0; 4107 /* 4108 * scope_id check. if sin6_scope_id is 0, we regard it 4109 * as a wildcard scope, which matches any scope zone ID. 4110 */ 4111 if (spidx0->dst.sin6.sin6_scope_id && 4112 spidx1->dst.sin6.sin6_scope_id && 4113 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4114 return 0; 4115 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4116 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4117 return 0; 4118 break; 4119 default: 4120 /* XXX */ 4121 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4122 return 0; 4123 break; 4124 } 4125 4126 /* XXX Do we check other field ? e.g. flowinfo */ 4127 4128 return 1; 4129 } 4130 4131 /* returns 0 on match */ 4132 static int 4133 key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2, 4134 int port) 4135 { 4136 #ifdef satosin 4137 #undef satosin 4138 #endif 4139 #define satosin(s) ((const struct sockaddr_in *)s) 4140 #ifdef satosin6 4141 #undef satosin6 4142 #endif 4143 #define satosin6(s) ((const struct sockaddr_in6 *)s) 4144 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4145 return 1; 4146 4147 switch (sa1->sa_family) { 4148 case AF_INET: 4149 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4150 return 1; 4151 if (satosin(sa1)->sin_addr.s_addr != 4152 satosin(sa2)->sin_addr.s_addr) { 4153 return 1; 4154 } 4155 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4156 return 1; 4157 break; 4158 case AF_INET6: 4159 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4160 return 1; /*EINVAL*/ 4161 if (satosin6(sa1)->sin6_scope_id != 4162 satosin6(sa2)->sin6_scope_id) { 4163 return 1; 4164 } 4165 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4166 &satosin6(sa2)->sin6_addr)) { 4167 return 1; 4168 } 4169 if (port && 4170 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4171 return 1; 4172 } 4173 break; 4174 default: 4175 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4176 return 1; 4177 break; 4178 } 4179 4180 return 0; 4181 #undef satosin 4182 #undef satosin6 4183 } 4184 4185 /* 4186 * compare two buffers with mask. 4187 * IN: 4188 * addr1: source 4189 * addr2: object 4190 * bits: Number of bits to compare 4191 * OUT: 4192 * 1 : equal 4193 * 0 : not equal 4194 */ 4195 static int 4196 key_bbcmp(const void *a1, const void *a2, u_int bits) 4197 { 4198 const unsigned char *p1 = a1; 4199 const unsigned char *p2 = a2; 4200 4201 /* XXX: This could be considerably faster if we compare a word 4202 * at a time, but it is complicated on LSB Endian machines */ 4203 4204 /* Handle null pointers */ 4205 if (p1 == NULL || p2 == NULL) 4206 return (p1 == p2); 4207 4208 while (bits >= 8) { 4209 if (*p1++ != *p2++) 4210 return 0; 4211 bits -= 8; 4212 } 4213 4214 if (bits > 0) { 4215 u_int8_t mask = ~((1<<(8-bits))-1); 4216 if ((*p1 & mask) != (*p2 & mask)) 4217 return 0; 4218 } 4219 return 1; /* Match! */ 4220 } 4221 4222 static void 4223 key_flush_spd(time_t now) 4224 { 4225 static u_int16_t sptree_scangen = 0; 4226 u_int16_t gen = sptree_scangen++; 4227 struct secpolicy *sp; 4228 u_int dir; 4229 4230 /* SPD */ 4231 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4232 restart: 4233 SPTREE_LOCK(); 4234 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4235 if (sp->scangen == gen) /* previously handled */ 4236 continue; 4237 sp->scangen = gen; 4238 if (sp->state == IPSEC_SPSTATE_DEAD && 4239 sp->refcnt == 1) { 4240 /* 4241 * Ensure that we only decrease refcnt once, 4242 * when we're the last consumer. 4243 * Directly call SP_DELREF/key_delsp instead 4244 * of KEY_FREESP to avoid unlocking/relocking 4245 * SPTREE_LOCK before key_delsp: may refcnt 4246 * be increased again during that time ? 4247 * NB: also clean entries created by 4248 * key_spdflush 4249 */ 4250 SP_DELREF(sp); 4251 key_delsp(sp); 4252 SPTREE_UNLOCK(); 4253 goto restart; 4254 } 4255 if (sp->lifetime == 0 && sp->validtime == 0) 4256 continue; 4257 if ((sp->lifetime && now - sp->created > sp->lifetime) 4258 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4259 sp->state = IPSEC_SPSTATE_DEAD; 4260 SPTREE_UNLOCK(); 4261 key_spdexpire(sp); 4262 goto restart; 4263 } 4264 } 4265 SPTREE_UNLOCK(); 4266 } 4267 } 4268 4269 static void 4270 key_flush_sad(time_t now) 4271 { 4272 struct secashead *sah, *nextsah; 4273 struct secasvar *sav, *nextsav; 4274 4275 /* SAD */ 4276 SAHTREE_LOCK(); 4277 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4278 /* if sah has been dead, then delete it and process next sah. */ 4279 if (sah->state == SADB_SASTATE_DEAD) { 4280 key_delsah(sah); 4281 continue; 4282 } 4283 4284 /* if LARVAL entry doesn't become MATURE, delete it. */ 4285 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4286 /* Need to also check refcnt for a larval SA ??? */ 4287 if (now - sav->created > V_key_larval_lifetime) 4288 KEY_FREESAV(&sav); 4289 } 4290 4291 /* 4292 * check MATURE entry to start to send expire message 4293 * whether or not. 4294 */ 4295 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4296 /* we don't need to check. */ 4297 if (sav->lft_s == NULL) 4298 continue; 4299 4300 /* sanity check */ 4301 if (sav->lft_c == NULL) { 4302 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4303 "time, why?\n", __func__)); 4304 continue; 4305 } 4306 /* 4307 * RFC 2367: 4308 * HARD lifetimes MUST take precedence over SOFT 4309 * lifetimes, meaning if the HARD and SOFT lifetimes 4310 * are the same, the HARD lifetime will appear on the 4311 * EXPIRE message. 4312 */ 4313 /* check HARD lifetime */ 4314 if ((sav->lft_h->addtime != 0 && 4315 now - sav->created > sav->lft_h->addtime) || 4316 (sav->lft_h->bytes != 0 && 4317 sav->lft_h->bytes < sav->lft_c->bytes)) { 4318 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4319 key_expire(sav, 1); 4320 KEY_FREESAV(&sav); 4321 } 4322 /* check SOFT lifetime */ 4323 else if ((sav->lft_s->addtime != 0 && 4324 now - sav->created > sav->lft_s->addtime) || 4325 (sav->lft_s->bytes != 0 && 4326 sav->lft_s->bytes < sav->lft_c->bytes)) { 4327 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4328 key_expire(sav, 0); 4329 } 4330 } 4331 4332 /* check DYING entry to change status to DEAD. */ 4333 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4334 /* we don't need to check. */ 4335 if (sav->lft_h == NULL) 4336 continue; 4337 4338 /* sanity check */ 4339 if (sav->lft_c == NULL) { 4340 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4341 "time, why?\n", __func__)); 4342 continue; 4343 } 4344 4345 if (sav->lft_h->addtime != 0 && 4346 now - sav->created > sav->lft_h->addtime) { 4347 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4348 key_expire(sav, 1); 4349 KEY_FREESAV(&sav); 4350 } 4351 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4352 else if (sav->lft_s != NULL 4353 && sav->lft_s->addtime != 0 4354 && now - sav->created > sav->lft_s->addtime) { 4355 /* 4356 * XXX: should be checked to be 4357 * installed the valid SA. 4358 */ 4359 4360 /* 4361 * If there is no SA then sending 4362 * expire message. 4363 */ 4364 key_expire(sav, 0); 4365 } 4366 #endif 4367 /* check HARD lifetime by bytes */ 4368 else if (sav->lft_h->bytes != 0 && 4369 sav->lft_h->bytes < sav->lft_c->bytes) { 4370 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4371 key_expire(sav, 1); 4372 KEY_FREESAV(&sav); 4373 } 4374 } 4375 4376 /* delete entry in DEAD */ 4377 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4378 /* sanity check */ 4379 if (sav->state != SADB_SASTATE_DEAD) { 4380 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4381 "(queue: %d SA: %d): kill it anyway\n", 4382 __func__, 4383 SADB_SASTATE_DEAD, sav->state)); 4384 } 4385 /* 4386 * do not call key_freesav() here. 4387 * sav should already be freed, and sav->refcnt 4388 * shows other references to sav 4389 * (such as from SPD). 4390 */ 4391 } 4392 } 4393 SAHTREE_UNLOCK(); 4394 } 4395 4396 static void 4397 key_flush_acq(time_t now) 4398 { 4399 struct secacq *acq, *nextacq; 4400 4401 /* ACQ tree */ 4402 ACQ_LOCK(); 4403 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4404 nextacq = LIST_NEXT(acq, chain); 4405 if (now - acq->created > V_key_blockacq_lifetime 4406 && __LIST_CHAINED(acq)) { 4407 LIST_REMOVE(acq, chain); 4408 free(acq, M_IPSEC_SAQ); 4409 } 4410 } 4411 ACQ_UNLOCK(); 4412 } 4413 4414 static void 4415 key_flush_spacq(time_t now) 4416 { 4417 struct secspacq *acq, *nextacq; 4418 4419 /* SP ACQ tree */ 4420 SPACQ_LOCK(); 4421 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4422 nextacq = LIST_NEXT(acq, chain); 4423 if (now - acq->created > V_key_blockacq_lifetime 4424 && __LIST_CHAINED(acq)) { 4425 LIST_REMOVE(acq, chain); 4426 free(acq, M_IPSEC_SAQ); 4427 } 4428 } 4429 SPACQ_UNLOCK(); 4430 } 4431 4432 /* 4433 * time handler. 4434 * scanning SPD and SAD to check status for each entries, 4435 * and do to remove or to expire. 4436 * XXX: year 2038 problem may remain. 4437 */ 4438 void 4439 key_timehandler(void) 4440 { 4441 VNET_ITERATOR_DECL(vnet_iter); 4442 time_t now = time_second; 4443 4444 VNET_LIST_RLOCK_NOSLEEP(); 4445 VNET_FOREACH(vnet_iter) { 4446 CURVNET_SET(vnet_iter); 4447 key_flush_spd(now); 4448 key_flush_sad(now); 4449 key_flush_acq(now); 4450 key_flush_spacq(now); 4451 CURVNET_RESTORE(); 4452 } 4453 VNET_LIST_RUNLOCK_NOSLEEP(); 4454 4455 #ifndef IPSEC_DEBUG2 4456 /* do exchange to tick time !! */ 4457 (void)timeout((void *)key_timehandler, (void *)0, hz); 4458 #endif /* IPSEC_DEBUG2 */ 4459 } 4460 4461 u_long 4462 key_random() 4463 { 4464 u_long value; 4465 4466 key_randomfill(&value, sizeof(value)); 4467 return value; 4468 } 4469 4470 void 4471 key_randomfill(void *p, size_t l) 4472 { 4473 size_t n; 4474 u_long v; 4475 static int warn = 1; 4476 4477 n = 0; 4478 n = (size_t)read_random(p, (u_int)l); 4479 /* last resort */ 4480 while (n < l) { 4481 v = random(); 4482 bcopy(&v, (u_int8_t *)p + n, 4483 l - n < sizeof(v) ? l - n : sizeof(v)); 4484 n += sizeof(v); 4485 4486 if (warn) { 4487 printf("WARNING: pseudo-random number generator " 4488 "used for IPsec processing\n"); 4489 warn = 0; 4490 } 4491 } 4492 } 4493 4494 /* 4495 * map SADB_SATYPE_* to IPPROTO_*. 4496 * if satype == SADB_SATYPE then satype is mapped to ~0. 4497 * OUT: 4498 * 0: invalid satype. 4499 */ 4500 static u_int16_t 4501 key_satype2proto(u_int8_t satype) 4502 { 4503 switch (satype) { 4504 case SADB_SATYPE_UNSPEC: 4505 return IPSEC_PROTO_ANY; 4506 case SADB_SATYPE_AH: 4507 return IPPROTO_AH; 4508 case SADB_SATYPE_ESP: 4509 return IPPROTO_ESP; 4510 case SADB_X_SATYPE_IPCOMP: 4511 return IPPROTO_IPCOMP; 4512 case SADB_X_SATYPE_TCPSIGNATURE: 4513 return IPPROTO_TCP; 4514 default: 4515 return 0; 4516 } 4517 /* NOTREACHED */ 4518 } 4519 4520 /* 4521 * map IPPROTO_* to SADB_SATYPE_* 4522 * OUT: 4523 * 0: invalid protocol type. 4524 */ 4525 static u_int8_t 4526 key_proto2satype(u_int16_t proto) 4527 { 4528 switch (proto) { 4529 case IPPROTO_AH: 4530 return SADB_SATYPE_AH; 4531 case IPPROTO_ESP: 4532 return SADB_SATYPE_ESP; 4533 case IPPROTO_IPCOMP: 4534 return SADB_X_SATYPE_IPCOMP; 4535 case IPPROTO_TCP: 4536 return SADB_X_SATYPE_TCPSIGNATURE; 4537 default: 4538 return 0; 4539 } 4540 /* NOTREACHED */ 4541 } 4542 4543 /* %%% PF_KEY */ 4544 /* 4545 * SADB_GETSPI processing is to receive 4546 * <base, (SA2), src address, dst address, (SPI range)> 4547 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4548 * tree with the status of LARVAL, and send 4549 * <base, SA(*), address(SD)> 4550 * to the IKMPd. 4551 * 4552 * IN: mhp: pointer to the pointer to each header. 4553 * OUT: NULL if fail. 4554 * other if success, return pointer to the message to send. 4555 */ 4556 static int 4557 key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4558 { 4559 struct sadb_address *src0, *dst0; 4560 struct secasindex saidx; 4561 struct secashead *newsah; 4562 struct secasvar *newsav; 4563 u_int8_t proto; 4564 u_int32_t spi; 4565 u_int8_t mode; 4566 u_int32_t reqid; 4567 int error; 4568 4569 IPSEC_ASSERT(so != NULL, ("null socket")); 4570 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4571 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4572 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4573 4574 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4575 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4576 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4577 __func__)); 4578 return key_senderror(so, m, EINVAL); 4579 } 4580 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4581 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4582 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4583 __func__)); 4584 return key_senderror(so, m, EINVAL); 4585 } 4586 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4587 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4588 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4589 } else { 4590 mode = IPSEC_MODE_ANY; 4591 reqid = 0; 4592 } 4593 4594 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4595 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4596 4597 /* map satype to proto */ 4598 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4599 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4600 __func__)); 4601 return key_senderror(so, m, EINVAL); 4602 } 4603 4604 /* 4605 * Make sure the port numbers are zero. 4606 * In case of NAT-T we will update them later if needed. 4607 */ 4608 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4609 case AF_INET: 4610 if (((struct sockaddr *)(src0 + 1))->sa_len != 4611 sizeof(struct sockaddr_in)) 4612 return key_senderror(so, m, EINVAL); 4613 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4614 break; 4615 case AF_INET6: 4616 if (((struct sockaddr *)(src0 + 1))->sa_len != 4617 sizeof(struct sockaddr_in6)) 4618 return key_senderror(so, m, EINVAL); 4619 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4620 break; 4621 default: 4622 ; /*???*/ 4623 } 4624 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4625 case AF_INET: 4626 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4627 sizeof(struct sockaddr_in)) 4628 return key_senderror(so, m, EINVAL); 4629 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4630 break; 4631 case AF_INET6: 4632 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4633 sizeof(struct sockaddr_in6)) 4634 return key_senderror(so, m, EINVAL); 4635 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4636 break; 4637 default: 4638 ; /*???*/ 4639 } 4640 4641 /* XXX boundary check against sa_len */ 4642 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4643 4644 #ifdef IPSEC_NAT_T 4645 /* 4646 * Handle NAT-T info if present. 4647 * We made sure the port numbers are zero above, so we do 4648 * not have to worry in case we do not update them. 4649 */ 4650 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4651 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4652 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4653 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4654 4655 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4656 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4657 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4658 struct sadb_x_nat_t_type *type; 4659 struct sadb_x_nat_t_port *sport, *dport; 4660 4661 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4662 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4663 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4664 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4665 "passed.\n", __func__)); 4666 return key_senderror(so, m, EINVAL); 4667 } 4668 4669 sport = (struct sadb_x_nat_t_port *) 4670 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4671 dport = (struct sadb_x_nat_t_port *) 4672 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4673 4674 if (sport) 4675 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4676 if (dport) 4677 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4678 } 4679 #endif 4680 4681 /* SPI allocation */ 4682 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4683 &saidx); 4684 if (spi == 0) 4685 return key_senderror(so, m, EINVAL); 4686 4687 /* get a SA index */ 4688 if ((newsah = key_getsah(&saidx)) == NULL) { 4689 /* create a new SA index */ 4690 if ((newsah = key_newsah(&saidx)) == NULL) { 4691 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4692 return key_senderror(so, m, ENOBUFS); 4693 } 4694 } 4695 4696 /* get a new SA */ 4697 /* XXX rewrite */ 4698 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4699 if (newsav == NULL) { 4700 /* XXX don't free new SA index allocated in above. */ 4701 return key_senderror(so, m, error); 4702 } 4703 4704 /* set spi */ 4705 newsav->spi = htonl(spi); 4706 4707 /* delete the entry in acqtree */ 4708 if (mhp->msg->sadb_msg_seq != 0) { 4709 struct secacq *acq; 4710 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4711 /* reset counter in order to deletion by timehandler. */ 4712 acq->created = time_second; 4713 acq->count = 0; 4714 } 4715 } 4716 4717 { 4718 struct mbuf *n, *nn; 4719 struct sadb_sa *m_sa; 4720 struct sadb_msg *newmsg; 4721 int off, len; 4722 4723 /* create new sadb_msg to reply. */ 4724 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4725 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4726 4727 MGETHDR(n, M_NOWAIT, MT_DATA); 4728 if (len > MHLEN) { 4729 MCLGET(n, M_NOWAIT); 4730 if ((n->m_flags & M_EXT) == 0) { 4731 m_freem(n); 4732 n = NULL; 4733 } 4734 } 4735 if (!n) 4736 return key_senderror(so, m, ENOBUFS); 4737 4738 n->m_len = len; 4739 n->m_next = NULL; 4740 off = 0; 4741 4742 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4743 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4744 4745 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4746 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4747 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4748 m_sa->sadb_sa_spi = htonl(spi); 4749 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4750 4751 IPSEC_ASSERT(off == len, 4752 ("length inconsistency (off %u len %u)", off, len)); 4753 4754 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4755 SADB_EXT_ADDRESS_DST); 4756 if (!n->m_next) { 4757 m_freem(n); 4758 return key_senderror(so, m, ENOBUFS); 4759 } 4760 4761 if (n->m_len < sizeof(struct sadb_msg)) { 4762 n = m_pullup(n, sizeof(struct sadb_msg)); 4763 if (n == NULL) 4764 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4765 } 4766 4767 n->m_pkthdr.len = 0; 4768 for (nn = n; nn; nn = nn->m_next) 4769 n->m_pkthdr.len += nn->m_len; 4770 4771 newmsg = mtod(n, struct sadb_msg *); 4772 newmsg->sadb_msg_seq = newsav->seq; 4773 newmsg->sadb_msg_errno = 0; 4774 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4775 4776 m_freem(m); 4777 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4778 } 4779 } 4780 4781 /* 4782 * allocating new SPI 4783 * called by key_getspi(). 4784 * OUT: 4785 * 0: failure. 4786 * others: success. 4787 */ 4788 static u_int32_t 4789 key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx) 4790 { 4791 u_int32_t newspi; 4792 u_int32_t min, max; 4793 int count = V_key_spi_trycnt; 4794 4795 /* set spi range to allocate */ 4796 if (spirange != NULL) { 4797 min = spirange->sadb_spirange_min; 4798 max = spirange->sadb_spirange_max; 4799 } else { 4800 min = V_key_spi_minval; 4801 max = V_key_spi_maxval; 4802 } 4803 /* IPCOMP needs 2-byte SPI */ 4804 if (saidx->proto == IPPROTO_IPCOMP) { 4805 u_int32_t t; 4806 if (min >= 0x10000) 4807 min = 0xffff; 4808 if (max >= 0x10000) 4809 max = 0xffff; 4810 if (min > max) { 4811 t = min; min = max; max = t; 4812 } 4813 } 4814 4815 if (min == max) { 4816 if (key_checkspidup(saidx, min) != NULL) { 4817 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4818 __func__, min)); 4819 return 0; 4820 } 4821 4822 count--; /* taking one cost. */ 4823 newspi = min; 4824 4825 } else { 4826 4827 /* init SPI */ 4828 newspi = 0; 4829 4830 /* when requesting to allocate spi ranged */ 4831 while (count--) { 4832 /* generate pseudo-random SPI value ranged. */ 4833 newspi = min + (key_random() % (max - min + 1)); 4834 4835 if (key_checkspidup(saidx, newspi) == NULL) 4836 break; 4837 } 4838 4839 if (count == 0 || newspi == 0) { 4840 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4841 __func__)); 4842 return 0; 4843 } 4844 } 4845 4846 /* statistics */ 4847 keystat.getspi_count = 4848 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4849 4850 return newspi; 4851 } 4852 4853 /* 4854 * SADB_UPDATE processing 4855 * receive 4856 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4857 * key(AE), (identity(SD),) (sensitivity)> 4858 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4859 * and send 4860 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4861 * (identity(SD),) (sensitivity)> 4862 * to the ikmpd. 4863 * 4864 * m will always be freed. 4865 */ 4866 static int 4867 key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4868 { 4869 struct sadb_sa *sa0; 4870 struct sadb_address *src0, *dst0; 4871 #ifdef IPSEC_NAT_T 4872 struct sadb_x_nat_t_type *type; 4873 struct sadb_x_nat_t_port *sport, *dport; 4874 struct sadb_address *iaddr, *raddr; 4875 struct sadb_x_nat_t_frag *frag; 4876 #endif 4877 struct secasindex saidx; 4878 struct secashead *sah; 4879 struct secasvar *sav; 4880 u_int16_t proto; 4881 u_int8_t mode; 4882 u_int32_t reqid; 4883 int error; 4884 4885 IPSEC_ASSERT(so != NULL, ("null socket")); 4886 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4887 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4888 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4889 4890 /* map satype to proto */ 4891 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4892 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4893 __func__)); 4894 return key_senderror(so, m, EINVAL); 4895 } 4896 4897 if (mhp->ext[SADB_EXT_SA] == NULL || 4898 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4899 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4900 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4901 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4902 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4903 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4904 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4905 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4906 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4907 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4908 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4909 __func__)); 4910 return key_senderror(so, m, EINVAL); 4911 } 4912 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4913 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4914 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4915 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4916 __func__)); 4917 return key_senderror(so, m, EINVAL); 4918 } 4919 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4920 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4921 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4922 } else { 4923 mode = IPSEC_MODE_ANY; 4924 reqid = 0; 4925 } 4926 /* XXX boundary checking for other extensions */ 4927 4928 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4929 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4930 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4931 4932 /* XXX boundary check against sa_len */ 4933 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4934 4935 /* 4936 * Make sure the port numbers are zero. 4937 * In case of NAT-T we will update them later if needed. 4938 */ 4939 KEY_PORTTOSADDR(&saidx.src, 0); 4940 KEY_PORTTOSADDR(&saidx.dst, 0); 4941 4942 #ifdef IPSEC_NAT_T 4943 /* 4944 * Handle NAT-T info if present. 4945 */ 4946 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4947 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4948 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4949 4950 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4951 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4952 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4953 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 4954 __func__)); 4955 return key_senderror(so, m, EINVAL); 4956 } 4957 4958 type = (struct sadb_x_nat_t_type *) 4959 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 4960 sport = (struct sadb_x_nat_t_port *) 4961 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4962 dport = (struct sadb_x_nat_t_port *) 4963 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4964 } else { 4965 type = 0; 4966 sport = dport = 0; 4967 } 4968 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 4969 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 4970 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 4971 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 4972 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4973 __func__)); 4974 return key_senderror(so, m, EINVAL); 4975 } 4976 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 4977 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 4978 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 4979 } else { 4980 iaddr = raddr = NULL; 4981 } 4982 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 4983 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 4984 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4985 __func__)); 4986 return key_senderror(so, m, EINVAL); 4987 } 4988 frag = (struct sadb_x_nat_t_frag *) 4989 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 4990 } else { 4991 frag = 0; 4992 } 4993 #endif 4994 4995 /* get a SA header */ 4996 if ((sah = key_getsah(&saidx)) == NULL) { 4997 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4998 return key_senderror(so, m, ENOENT); 4999 } 5000 5001 /* set spidx if there */ 5002 /* XXX rewrite */ 5003 error = key_setident(sah, m, mhp); 5004 if (error) 5005 return key_senderror(so, m, error); 5006 5007 /* find a SA with sequence number. */ 5008 #ifdef IPSEC_DOSEQCHECK 5009 if (mhp->msg->sadb_msg_seq != 0 5010 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5011 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5012 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5013 return key_senderror(so, m, ENOENT); 5014 } 5015 #else 5016 SAHTREE_LOCK(); 5017 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5018 SAHTREE_UNLOCK(); 5019 if (sav == NULL) { 5020 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5021 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5022 return key_senderror(so, m, EINVAL); 5023 } 5024 #endif 5025 5026 /* validity check */ 5027 if (sav->sah->saidx.proto != proto) { 5028 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5029 "(DB=%u param=%u)\n", __func__, 5030 sav->sah->saidx.proto, proto)); 5031 return key_senderror(so, m, EINVAL); 5032 } 5033 #ifdef IPSEC_DOSEQCHECK 5034 if (sav->spi != sa0->sadb_sa_spi) { 5035 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5036 __func__, 5037 (u_int32_t)ntohl(sav->spi), 5038 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5039 return key_senderror(so, m, EINVAL); 5040 } 5041 #endif 5042 if (sav->pid != mhp->msg->sadb_msg_pid) { 5043 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5044 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5045 return key_senderror(so, m, EINVAL); 5046 } 5047 5048 /* copy sav values */ 5049 error = key_setsaval(sav, m, mhp); 5050 if (error) { 5051 KEY_FREESAV(&sav); 5052 return key_senderror(so, m, error); 5053 } 5054 5055 #ifdef IPSEC_NAT_T 5056 /* 5057 * Handle more NAT-T info if present, 5058 * now that we have a sav to fill. 5059 */ 5060 if (type) 5061 sav->natt_type = type->sadb_x_nat_t_type_type; 5062 5063 if (sport) 5064 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5065 sport->sadb_x_nat_t_port_port); 5066 if (dport) 5067 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5068 dport->sadb_x_nat_t_port_port); 5069 5070 #if 0 5071 /* 5072 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5073 * We should actually check for a minimum MTU here, if we 5074 * want to support it in ip_output. 5075 */ 5076 if (frag) 5077 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5078 #endif 5079 #endif 5080 5081 /* check SA values to be mature. */ 5082 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5083 KEY_FREESAV(&sav); 5084 return key_senderror(so, m, 0); 5085 } 5086 5087 { 5088 struct mbuf *n; 5089 5090 /* set msg buf from mhp */ 5091 n = key_getmsgbuf_x1(m, mhp); 5092 if (n == NULL) { 5093 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5094 return key_senderror(so, m, ENOBUFS); 5095 } 5096 5097 m_freem(m); 5098 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5099 } 5100 } 5101 5102 /* 5103 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5104 * only called by key_update(). 5105 * OUT: 5106 * NULL : not found 5107 * others : found, pointer to a SA. 5108 */ 5109 #ifdef IPSEC_DOSEQCHECK 5110 static struct secasvar * 5111 key_getsavbyseq(struct secashead *sah, u_int32_t seq) 5112 { 5113 struct secasvar *sav; 5114 u_int state; 5115 5116 state = SADB_SASTATE_LARVAL; 5117 5118 /* search SAD with sequence number ? */ 5119 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5120 5121 KEY_CHKSASTATE(state, sav->state, __func__); 5122 5123 if (sav->seq == seq) { 5124 sa_addref(sav); 5125 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5126 printf("DP %s cause refcnt++:%d SA:%p\n", 5127 __func__, sav->refcnt, sav)); 5128 return sav; 5129 } 5130 } 5131 5132 return NULL; 5133 } 5134 #endif 5135 5136 /* 5137 * SADB_ADD processing 5138 * add an entry to SA database, when received 5139 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5140 * key(AE), (identity(SD),) (sensitivity)> 5141 * from the ikmpd, 5142 * and send 5143 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5144 * (identity(SD),) (sensitivity)> 5145 * to the ikmpd. 5146 * 5147 * IGNORE identity and sensitivity messages. 5148 * 5149 * m will always be freed. 5150 */ 5151 static int 5152 key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5153 { 5154 struct sadb_sa *sa0; 5155 struct sadb_address *src0, *dst0; 5156 #ifdef IPSEC_NAT_T 5157 struct sadb_x_nat_t_type *type; 5158 struct sadb_address *iaddr, *raddr; 5159 struct sadb_x_nat_t_frag *frag; 5160 #endif 5161 struct secasindex saidx; 5162 struct secashead *newsah; 5163 struct secasvar *newsav; 5164 u_int16_t proto; 5165 u_int8_t mode; 5166 u_int32_t reqid; 5167 int error; 5168 5169 IPSEC_ASSERT(so != NULL, ("null socket")); 5170 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5171 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5172 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5173 5174 /* map satype to proto */ 5175 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5176 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5177 __func__)); 5178 return key_senderror(so, m, EINVAL); 5179 } 5180 5181 if (mhp->ext[SADB_EXT_SA] == NULL || 5182 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5183 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5184 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5185 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5186 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5187 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5188 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5189 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5190 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5191 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5192 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5193 __func__)); 5194 return key_senderror(so, m, EINVAL); 5195 } 5196 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5197 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5198 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5199 /* XXX need more */ 5200 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5201 __func__)); 5202 return key_senderror(so, m, EINVAL); 5203 } 5204 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5205 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5206 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5207 } else { 5208 mode = IPSEC_MODE_ANY; 5209 reqid = 0; 5210 } 5211 5212 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5213 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5214 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5215 5216 /* XXX boundary check against sa_len */ 5217 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5218 5219 /* 5220 * Make sure the port numbers are zero. 5221 * In case of NAT-T we will update them later if needed. 5222 */ 5223 KEY_PORTTOSADDR(&saidx.src, 0); 5224 KEY_PORTTOSADDR(&saidx.dst, 0); 5225 5226 #ifdef IPSEC_NAT_T 5227 /* 5228 * Handle NAT-T info if present. 5229 */ 5230 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5231 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5232 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5233 struct sadb_x_nat_t_port *sport, *dport; 5234 5235 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5236 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5237 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5238 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5239 __func__)); 5240 return key_senderror(so, m, EINVAL); 5241 } 5242 5243 type = (struct sadb_x_nat_t_type *) 5244 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5245 sport = (struct sadb_x_nat_t_port *) 5246 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5247 dport = (struct sadb_x_nat_t_port *) 5248 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5249 5250 if (sport) 5251 KEY_PORTTOSADDR(&saidx.src, 5252 sport->sadb_x_nat_t_port_port); 5253 if (dport) 5254 KEY_PORTTOSADDR(&saidx.dst, 5255 dport->sadb_x_nat_t_port_port); 5256 } else { 5257 type = 0; 5258 } 5259 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5260 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5261 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5262 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5263 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5264 __func__)); 5265 return key_senderror(so, m, EINVAL); 5266 } 5267 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5268 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5269 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5270 } else { 5271 iaddr = raddr = NULL; 5272 } 5273 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5274 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5275 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5276 __func__)); 5277 return key_senderror(so, m, EINVAL); 5278 } 5279 frag = (struct sadb_x_nat_t_frag *) 5280 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5281 } else { 5282 frag = 0; 5283 } 5284 #endif 5285 5286 /* get a SA header */ 5287 if ((newsah = key_getsah(&saidx)) == NULL) { 5288 /* create a new SA header */ 5289 if ((newsah = key_newsah(&saidx)) == NULL) { 5290 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5291 return key_senderror(so, m, ENOBUFS); 5292 } 5293 } 5294 5295 /* set spidx if there */ 5296 /* XXX rewrite */ 5297 error = key_setident(newsah, m, mhp); 5298 if (error) { 5299 return key_senderror(so, m, error); 5300 } 5301 5302 /* create new SA entry. */ 5303 /* We can create new SA only if SPI is differenct. */ 5304 SAHTREE_LOCK(); 5305 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5306 SAHTREE_UNLOCK(); 5307 if (newsav != NULL) { 5308 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5309 return key_senderror(so, m, EEXIST); 5310 } 5311 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5312 if (newsav == NULL) { 5313 return key_senderror(so, m, error); 5314 } 5315 5316 #ifdef IPSEC_NAT_T 5317 /* 5318 * Handle more NAT-T info if present, 5319 * now that we have a sav to fill. 5320 */ 5321 if (type) 5322 newsav->natt_type = type->sadb_x_nat_t_type_type; 5323 5324 #if 0 5325 /* 5326 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5327 * We should actually check for a minimum MTU here, if we 5328 * want to support it in ip_output. 5329 */ 5330 if (frag) 5331 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5332 #endif 5333 #endif 5334 5335 /* check SA values to be mature. */ 5336 if ((error = key_mature(newsav)) != 0) { 5337 KEY_FREESAV(&newsav); 5338 return key_senderror(so, m, error); 5339 } 5340 5341 /* 5342 * don't call key_freesav() here, as we would like to keep the SA 5343 * in the database on success. 5344 */ 5345 5346 { 5347 struct mbuf *n; 5348 5349 /* set msg buf from mhp */ 5350 n = key_getmsgbuf_x1(m, mhp); 5351 if (n == NULL) { 5352 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5353 return key_senderror(so, m, ENOBUFS); 5354 } 5355 5356 m_freem(m); 5357 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5358 } 5359 } 5360 5361 /* m is retained */ 5362 static int 5363 key_setident(struct secashead *sah, struct mbuf *m, 5364 const struct sadb_msghdr *mhp) 5365 { 5366 const struct sadb_ident *idsrc, *iddst; 5367 int idsrclen, iddstlen; 5368 5369 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5370 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5371 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5372 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5373 5374 /* don't make buffer if not there */ 5375 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5376 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5377 sah->idents = NULL; 5378 sah->identd = NULL; 5379 return 0; 5380 } 5381 5382 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5383 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5384 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5385 return EINVAL; 5386 } 5387 5388 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5389 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5390 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5391 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5392 5393 /* validity check */ 5394 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5395 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5396 return EINVAL; 5397 } 5398 5399 switch (idsrc->sadb_ident_type) { 5400 case SADB_IDENTTYPE_PREFIX: 5401 case SADB_IDENTTYPE_FQDN: 5402 case SADB_IDENTTYPE_USERFQDN: 5403 default: 5404 /* XXX do nothing */ 5405 sah->idents = NULL; 5406 sah->identd = NULL; 5407 return 0; 5408 } 5409 5410 /* make structure */ 5411 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5412 if (sah->idents == NULL) { 5413 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5414 return ENOBUFS; 5415 } 5416 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5417 if (sah->identd == NULL) { 5418 free(sah->idents, M_IPSEC_MISC); 5419 sah->idents = NULL; 5420 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5421 return ENOBUFS; 5422 } 5423 sah->idents->type = idsrc->sadb_ident_type; 5424 sah->idents->id = idsrc->sadb_ident_id; 5425 5426 sah->identd->type = iddst->sadb_ident_type; 5427 sah->identd->id = iddst->sadb_ident_id; 5428 5429 return 0; 5430 } 5431 5432 /* 5433 * m will not be freed on return. 5434 * it is caller's responsibility to free the result. 5435 */ 5436 static struct mbuf * 5437 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) 5438 { 5439 struct mbuf *n; 5440 5441 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5442 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5443 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5444 5445 /* create new sadb_msg to reply. */ 5446 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5447 SADB_EXT_SA, SADB_X_EXT_SA2, 5448 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5449 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5450 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5451 if (!n) 5452 return NULL; 5453 5454 if (n->m_len < sizeof(struct sadb_msg)) { 5455 n = m_pullup(n, sizeof(struct sadb_msg)); 5456 if (n == NULL) 5457 return NULL; 5458 } 5459 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5460 mtod(n, struct sadb_msg *)->sadb_msg_len = 5461 PFKEY_UNIT64(n->m_pkthdr.len); 5462 5463 return n; 5464 } 5465 5466 /* 5467 * SADB_DELETE processing 5468 * receive 5469 * <base, SA(*), address(SD)> 5470 * from the ikmpd, and set SADB_SASTATE_DEAD, 5471 * and send, 5472 * <base, SA(*), address(SD)> 5473 * to the ikmpd. 5474 * 5475 * m will always be freed. 5476 */ 5477 static int 5478 key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5479 { 5480 struct sadb_sa *sa0; 5481 struct sadb_address *src0, *dst0; 5482 struct secasindex saidx; 5483 struct secashead *sah; 5484 struct secasvar *sav = NULL; 5485 u_int16_t proto; 5486 5487 IPSEC_ASSERT(so != NULL, ("null socket")); 5488 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5489 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5490 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5491 5492 /* map satype to proto */ 5493 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5494 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5495 __func__)); 5496 return key_senderror(so, m, EINVAL); 5497 } 5498 5499 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5500 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5501 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5502 __func__)); 5503 return key_senderror(so, m, EINVAL); 5504 } 5505 5506 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5507 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5508 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5509 __func__)); 5510 return key_senderror(so, m, EINVAL); 5511 } 5512 5513 if (mhp->ext[SADB_EXT_SA] == NULL) { 5514 /* 5515 * Caller wants us to delete all non-LARVAL SAs 5516 * that match the src/dst. This is used during 5517 * IKE INITIAL-CONTACT. 5518 */ 5519 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5520 return key_delete_all(so, m, mhp, proto); 5521 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5522 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5523 __func__)); 5524 return key_senderror(so, m, EINVAL); 5525 } 5526 5527 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5528 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5529 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5530 5531 /* XXX boundary check against sa_len */ 5532 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5533 5534 /* 5535 * Make sure the port numbers are zero. 5536 * In case of NAT-T we will update them later if needed. 5537 */ 5538 KEY_PORTTOSADDR(&saidx.src, 0); 5539 KEY_PORTTOSADDR(&saidx.dst, 0); 5540 5541 #ifdef IPSEC_NAT_T 5542 /* 5543 * Handle NAT-T info if present. 5544 */ 5545 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5546 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5547 struct sadb_x_nat_t_port *sport, *dport; 5548 5549 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5550 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5551 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5552 __func__)); 5553 return key_senderror(so, m, EINVAL); 5554 } 5555 5556 sport = (struct sadb_x_nat_t_port *) 5557 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5558 dport = (struct sadb_x_nat_t_port *) 5559 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5560 5561 if (sport) 5562 KEY_PORTTOSADDR(&saidx.src, 5563 sport->sadb_x_nat_t_port_port); 5564 if (dport) 5565 KEY_PORTTOSADDR(&saidx.dst, 5566 dport->sadb_x_nat_t_port_port); 5567 } 5568 #endif 5569 5570 /* get a SA header */ 5571 SAHTREE_LOCK(); 5572 LIST_FOREACH(sah, &V_sahtree, chain) { 5573 if (sah->state == SADB_SASTATE_DEAD) 5574 continue; 5575 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5576 continue; 5577 5578 /* get a SA with SPI. */ 5579 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5580 if (sav) 5581 break; 5582 } 5583 if (sah == NULL) { 5584 SAHTREE_UNLOCK(); 5585 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5586 return key_senderror(so, m, ENOENT); 5587 } 5588 5589 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5590 KEY_FREESAV(&sav); 5591 SAHTREE_UNLOCK(); 5592 5593 { 5594 struct mbuf *n; 5595 struct sadb_msg *newmsg; 5596 5597 /* create new sadb_msg to reply. */ 5598 /* XXX-BZ NAT-T extensions? */ 5599 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5600 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5601 if (!n) 5602 return key_senderror(so, m, ENOBUFS); 5603 5604 if (n->m_len < sizeof(struct sadb_msg)) { 5605 n = m_pullup(n, sizeof(struct sadb_msg)); 5606 if (n == NULL) 5607 return key_senderror(so, m, ENOBUFS); 5608 } 5609 newmsg = mtod(n, struct sadb_msg *); 5610 newmsg->sadb_msg_errno = 0; 5611 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5612 5613 m_freem(m); 5614 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5615 } 5616 } 5617 5618 /* 5619 * delete all SAs for src/dst. Called from key_delete(). 5620 */ 5621 static int 5622 key_delete_all(struct socket *so, struct mbuf *m, 5623 const struct sadb_msghdr *mhp, u_int16_t proto) 5624 { 5625 struct sadb_address *src0, *dst0; 5626 struct secasindex saidx; 5627 struct secashead *sah; 5628 struct secasvar *sav, *nextsav; 5629 u_int stateidx, state; 5630 5631 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5632 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5633 5634 /* XXX boundary check against sa_len */ 5635 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5636 5637 /* 5638 * Make sure the port numbers are zero. 5639 * In case of NAT-T we will update them later if needed. 5640 */ 5641 KEY_PORTTOSADDR(&saidx.src, 0); 5642 KEY_PORTTOSADDR(&saidx.dst, 0); 5643 5644 #ifdef IPSEC_NAT_T 5645 /* 5646 * Handle NAT-T info if present. 5647 */ 5648 5649 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5650 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5651 struct sadb_x_nat_t_port *sport, *dport; 5652 5653 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5654 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5655 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5656 __func__)); 5657 return key_senderror(so, m, EINVAL); 5658 } 5659 5660 sport = (struct sadb_x_nat_t_port *) 5661 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5662 dport = (struct sadb_x_nat_t_port *) 5663 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5664 5665 if (sport) 5666 KEY_PORTTOSADDR(&saidx.src, 5667 sport->sadb_x_nat_t_port_port); 5668 if (dport) 5669 KEY_PORTTOSADDR(&saidx.dst, 5670 dport->sadb_x_nat_t_port_port); 5671 } 5672 #endif 5673 5674 SAHTREE_LOCK(); 5675 LIST_FOREACH(sah, &V_sahtree, chain) { 5676 if (sah->state == SADB_SASTATE_DEAD) 5677 continue; 5678 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5679 continue; 5680 5681 /* Delete all non-LARVAL SAs. */ 5682 for (stateidx = 0; 5683 stateidx < _ARRAYLEN(saorder_state_alive); 5684 stateidx++) { 5685 state = saorder_state_alive[stateidx]; 5686 if (state == SADB_SASTATE_LARVAL) 5687 continue; 5688 for (sav = LIST_FIRST(&sah->savtree[state]); 5689 sav != NULL; sav = nextsav) { 5690 nextsav = LIST_NEXT(sav, chain); 5691 /* sanity check */ 5692 if (sav->state != state) { 5693 ipseclog((LOG_DEBUG, "%s: invalid " 5694 "sav->state (queue %d SA %d)\n", 5695 __func__, state, sav->state)); 5696 continue; 5697 } 5698 5699 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5700 KEY_FREESAV(&sav); 5701 } 5702 } 5703 } 5704 SAHTREE_UNLOCK(); 5705 { 5706 struct mbuf *n; 5707 struct sadb_msg *newmsg; 5708 5709 /* create new sadb_msg to reply. */ 5710 /* XXX-BZ NAT-T extensions? */ 5711 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5712 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5713 if (!n) 5714 return key_senderror(so, m, ENOBUFS); 5715 5716 if (n->m_len < sizeof(struct sadb_msg)) { 5717 n = m_pullup(n, sizeof(struct sadb_msg)); 5718 if (n == NULL) 5719 return key_senderror(so, m, ENOBUFS); 5720 } 5721 newmsg = mtod(n, struct sadb_msg *); 5722 newmsg->sadb_msg_errno = 0; 5723 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5724 5725 m_freem(m); 5726 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5727 } 5728 } 5729 5730 /* 5731 * SADB_GET processing 5732 * receive 5733 * <base, SA(*), address(SD)> 5734 * from the ikmpd, and get a SP and a SA to respond, 5735 * and send, 5736 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5737 * (identity(SD),) (sensitivity)> 5738 * to the ikmpd. 5739 * 5740 * m will always be freed. 5741 */ 5742 static int 5743 key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5744 { 5745 struct sadb_sa *sa0; 5746 struct sadb_address *src0, *dst0; 5747 struct secasindex saidx; 5748 struct secashead *sah; 5749 struct secasvar *sav = NULL; 5750 u_int16_t proto; 5751 5752 IPSEC_ASSERT(so != NULL, ("null socket")); 5753 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5754 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5755 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5756 5757 /* map satype to proto */ 5758 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5759 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5760 __func__)); 5761 return key_senderror(so, m, EINVAL); 5762 } 5763 5764 if (mhp->ext[SADB_EXT_SA] == NULL || 5765 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5766 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5767 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5768 __func__)); 5769 return key_senderror(so, m, EINVAL); 5770 } 5771 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5772 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5773 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5774 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5775 __func__)); 5776 return key_senderror(so, m, EINVAL); 5777 } 5778 5779 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5780 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5781 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5782 5783 /* XXX boundary check against sa_len */ 5784 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5785 5786 /* 5787 * Make sure the port numbers are zero. 5788 * In case of NAT-T we will update them later if needed. 5789 */ 5790 KEY_PORTTOSADDR(&saidx.src, 0); 5791 KEY_PORTTOSADDR(&saidx.dst, 0); 5792 5793 #ifdef IPSEC_NAT_T 5794 /* 5795 * Handle NAT-T info if present. 5796 */ 5797 5798 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5799 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5800 struct sadb_x_nat_t_port *sport, *dport; 5801 5802 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5803 mhp->extlen[