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sys/netipsec/key.c
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1 /* $FreeBSD: releng/8.1/sys/netipsec/key.c 208194 2010-05-17 15:31:24Z vanhu $ */ 2 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4 /*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * This code is referd to RFC 2367 35 */ 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 #include "opt_ipsec.h" 40 41 #include <sys/types.h> 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/lock.h> 46 #include <sys/mutex.h> 47 #include <sys/mbuf.h> 48 #include <sys/domain.h> 49 #include <sys/protosw.h> 50 #include <sys/malloc.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/sysctl.h> 54 #include <sys/errno.h> 55 #include <sys/proc.h> 56 #include <sys/queue.h> 57 #include <sys/refcount.h> 58 #include <sys/syslog.h> 59 60 #include <net/if.h> 61 #include <net/route.h> 62 #include <net/raw_cb.h> 63 #include <net/vnet.h> 64 65 #include <netinet/in.h> 66 #include <netinet/in_systm.h> 67 #include <netinet/ip.h> 68 #include <netinet/in_var.h> 69 70 #ifdef INET6 71 #include <netinet/ip6.h> 72 #include <netinet6/in6_var.h> 73 #include <netinet6/ip6_var.h> 74 #endif /* INET6 */ 75 76 #ifdef INET 77 #include <netinet/in_pcb.h> 78 #endif 79 #ifdef INET6 80 #include <netinet6/in6_pcb.h> 81 #endif /* INET6 */ 82 83 #include <net/pfkeyv2.h> 84 #include <netipsec/keydb.h> 85 #include <netipsec/key.h> 86 #include <netipsec/keysock.h> 87 #include <netipsec/key_debug.h> 88 89 #include <netipsec/ipsec.h> 90 #ifdef INET6 91 #include <netipsec/ipsec6.h> 92 #endif 93 94 #include <netipsec/xform.h> 95 96 #include <machine/stdarg.h> 97 98 /* randomness */ 99 #include <sys/random.h> 100 101 #define FULLMASK 0xff 102 #define _BITS(bytes) ((bytes) << 3) 103 104 /* 105 * Note on SA reference counting: 106 * - SAs that are not in DEAD state will have (total external reference + 1) 107 * following value in reference count field. they cannot be freed and are 108 * referenced from SA header. 109 * - SAs that are in DEAD state will have (total external reference) 110 * in reference count field. they are ready to be freed. reference from 111 * SA header will be removed in key_delsav(), when the reference count 112 * field hits 0 (= no external reference other than from SA header. 113 */ 114 115 VNET_DEFINE(u_int32_t, key_debug_level) = 0; 116 static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 117 static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 118 static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 119 static VNET_DEFINE(u_int32_t, policy_id) = 0; 120 /*interval to initialize randseed,1(m)*/ 121 static VNET_DEFINE(u_int, key_int_random) = 60; 122 /* interval to expire acquiring, 30(s)*/ 123 static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 124 /* counter for blocking SADB_ACQUIRE.*/ 125 static VNET_DEFINE(int, key_blockacq_count) = 10; 126 /* lifetime for blocking SADB_ACQUIRE.*/ 127 static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 128 /* preferred old sa rather than new sa.*/ 129 static VNET_DEFINE(int, key_preferred_oldsa) = 1; 130 #define V_key_spi_trycnt VNET(key_spi_trycnt) 131 #define V_key_spi_minval VNET(key_spi_minval) 132 #define V_key_spi_maxval VNET(key_spi_maxval) 133 #define V_policy_id VNET(policy_id) 134 #define V_key_int_random VNET(key_int_random) 135 #define V_key_larval_lifetime VNET(key_larval_lifetime) 136 #define V_key_blockacq_count VNET(key_blockacq_count) 137 #define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 138 #define V_key_preferred_oldsa VNET(key_preferred_oldsa) 139 140 static VNET_DEFINE(u_int32_t, acq_seq) = 0; 141 #define V_acq_seq VNET(acq_seq) 142 143 /* SPD */ 144 static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 145 #define V_sptree VNET(sptree) 146 static struct mtx sptree_lock; 147 #define SPTREE_LOCK_INIT() \ 148 mtx_init(&sptree_lock, "sptree", \ 149 "fast ipsec security policy database", MTX_DEF) 150 #define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 151 #define SPTREE_LOCK() mtx_lock(&sptree_lock) 152 #define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 153 #define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 154 155 static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 156 #define V_sahtree VNET(sahtree) 157 static struct mtx sahtree_lock; 158 #define SAHTREE_LOCK_INIT() \ 159 mtx_init(&sahtree_lock, "sahtree", \ 160 "fast ipsec security association database", MTX_DEF) 161 #define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 162 #define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 163 #define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 164 #define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 165 166 /* registed list */ 167 static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 168 #define V_regtree VNET(regtree) 169 static struct mtx regtree_lock; 170 #define REGTREE_LOCK_INIT() \ 171 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 172 #define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 173 #define REGTREE_LOCK() mtx_lock(®tree_lock) 174 #define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 175 #define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 176 177 static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 178 #define V_acqtree VNET(acqtree) 179 static struct mtx acq_lock; 180 #define ACQ_LOCK_INIT() \ 181 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 182 #define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 183 #define ACQ_LOCK() mtx_lock(&acq_lock) 184 #define ACQ_UNLOCK() mtx_unlock(&acq_lock) 185 #define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 186 187 /* SP acquiring list */ 188 static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 189 #define V_spacqtree VNET(spacqtree) 190 static struct mtx spacq_lock; 191 #define SPACQ_LOCK_INIT() \ 192 mtx_init(&spacq_lock, "spacqtree", \ 193 "fast ipsec security policy acquire list", MTX_DEF) 194 #define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 195 #define SPACQ_LOCK() mtx_lock(&spacq_lock) 196 #define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 197 #define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 198 199 /* search order for SAs */ 200 static const u_int saorder_state_valid_prefer_old[] = { 201 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 202 }; 203 static const u_int saorder_state_valid_prefer_new[] = { 204 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 205 }; 206 static const u_int saorder_state_alive[] = { 207 /* except DEAD */ 208 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 209 }; 210 static const u_int saorder_state_any[] = { 211 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 212 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 213 }; 214 215 static const int minsize[] = { 216 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 217 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 220 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 221 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 223 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 224 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 225 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 226 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 227 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 228 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 229 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 230 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 231 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 232 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 233 0, /* SADB_X_EXT_KMPRIVATE */ 234 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 235 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 236 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 237 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 238 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 239 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 240 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 241 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 242 }; 243 static const int maxsize[] = { 244 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 245 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 246 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 248 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 249 0, /* SADB_EXT_ADDRESS_SRC */ 250 0, /* SADB_EXT_ADDRESS_DST */ 251 0, /* SADB_EXT_ADDRESS_PROXY */ 252 0, /* SADB_EXT_KEY_AUTH */ 253 0, /* SADB_EXT_KEY_ENCRYPT */ 254 0, /* SADB_EXT_IDENTITY_SRC */ 255 0, /* SADB_EXT_IDENTITY_DST */ 256 0, /* SADB_EXT_SENSITIVITY */ 257 0, /* SADB_EXT_PROPOSAL */ 258 0, /* SADB_EXT_SUPPORTED_AUTH */ 259 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 260 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 261 0, /* SADB_X_EXT_KMPRIVATE */ 262 0, /* SADB_X_EXT_POLICY */ 263 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 264 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 265 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 266 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 267 0, /* SADB_X_EXT_NAT_T_OAI */ 268 0, /* SADB_X_EXT_NAT_T_OAR */ 269 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 270 }; 271 272 static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 273 static VNET_DEFINE(int, ipsec_esp_auth) = 0; 274 static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 275 276 #define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 277 #define V_ipsec_esp_auth VNET(ipsec_esp_auth) 278 #define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 279 280 #ifdef SYSCTL_DECL 281 SYSCTL_DECL(_net_key); 282 #endif 283 284 SYSCTL_VNET_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 285 CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 286 287 /* max count of trial for the decision of spi value */ 288 SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 289 CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 290 291 /* minimum spi value to allocate automatically. */ 292 SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MIN_VALUE, 293 spi_minval, CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 294 295 /* maximun spi value to allocate automatically. */ 296 SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MAX_VALUE, 297 spi_maxval, CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 298 299 /* interval to initialize randseed */ 300 SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 301 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 302 303 /* lifetime for larval SA */ 304 SYSCTL_VNET_INT(_net_key, KEYCTL_LARVAL_LIFETIME, 305 larval_lifetime, CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 306 307 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 308 SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, 309 blockacq_count, CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 310 311 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 312 SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 313 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 314 315 /* ESP auth */ 316 SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 317 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 318 319 /* minimum ESP key length */ 320 SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 321 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 322 323 /* minimum AH key length */ 324 SYSCTL_VNET_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 325 CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 326 327 /* perfered old SA rather than new SA */ 328 SYSCTL_VNET_INT(_net_key, KEYCTL_PREFERED_OLDSA, 329 preferred_oldsa, CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 330 331 #define __LIST_CHAINED(elm) \ 332 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 333 #define LIST_INSERT_TAIL(head, elm, type, field) \ 334 do {\ 335 struct type *curelm = LIST_FIRST(head); \ 336 if (curelm == NULL) {\ 337 LIST_INSERT_HEAD(head, elm, field); \ 338 } else { \ 339 while (LIST_NEXT(curelm, field)) \ 340 curelm = LIST_NEXT(curelm, field);\ 341 LIST_INSERT_AFTER(curelm, elm, field);\ 342 }\ 343 } while (0) 344 345 #define KEY_CHKSASTATE(head, sav, name) \ 346 do { \ 347 if ((head) != (sav)) { \ 348 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 349 (name), (head), (sav))); \ 350 continue; \ 351 } \ 352 } while (0) 353 354 #define KEY_CHKSPDIR(head, sp, name) \ 355 do { \ 356 if ((head) != (sp)) { \ 357 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 358 "anyway continue.\n", \ 359 (name), (head), (sp))); \ 360 } \ 361 } while (0) 362 363 MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 364 MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 365 MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 366 MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 367 MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 368 MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 369 MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 370 371 /* 372 * set parameters into secpolicyindex buffer. 373 * Must allocate secpolicyindex buffer passed to this function. 374 */ 375 #define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 376 do { \ 377 bzero((idx), sizeof(struct secpolicyindex)); \ 378 (idx)->dir = (_dir); \ 379 (idx)->prefs = (ps); \ 380 (idx)->prefd = (pd); \ 381 (idx)->ul_proto = (ulp); \ 382 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 383 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 384 } while (0) 385 386 /* 387 * set parameters into secasindex buffer. 388 * Must allocate secasindex buffer before calling this function. 389 */ 390 #define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 391 do { \ 392 bzero((idx), sizeof(struct secasindex)); \ 393 (idx)->proto = (p); \ 394 (idx)->mode = (m); \ 395 (idx)->reqid = (r); \ 396 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 397 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 398 } while (0) 399 400 /* key statistics */ 401 struct _keystat { 402 u_long getspi_count; /* the avarage of count to try to get new SPI */ 403 } keystat; 404 405 struct sadb_msghdr { 406 struct sadb_msg *msg; 407 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 408 int extoff[SADB_EXT_MAX + 1]; 409 int extlen[SADB_EXT_MAX + 1]; 410 }; 411 412 static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 413 static void key_freesp_so __P((struct secpolicy **)); 414 static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 415 static void key_delsp __P((struct secpolicy *)); 416 static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 417 static void _key_delsp(struct secpolicy *sp); 418 static struct secpolicy *key_getspbyid __P((u_int32_t)); 419 static u_int32_t key_newreqid __P((void)); 420 static struct mbuf *key_gather_mbuf __P((struct mbuf *, 421 const struct sadb_msghdr *, int, int, ...)); 422 static int key_spdadd __P((struct socket *, struct mbuf *, 423 const struct sadb_msghdr *)); 424 static u_int32_t key_getnewspid __P((void)); 425 static int key_spddelete __P((struct socket *, struct mbuf *, 426 const struct sadb_msghdr *)); 427 static int key_spddelete2 __P((struct socket *, struct mbuf *, 428 const struct sadb_msghdr *)); 429 static int key_spdget __P((struct socket *, struct mbuf *, 430 const struct sadb_msghdr *)); 431 static int key_spdflush __P((struct socket *, struct mbuf *, 432 const struct sadb_msghdr *)); 433 static int key_spddump __P((struct socket *, struct mbuf *, 434 const struct sadb_msghdr *)); 435 static struct mbuf *key_setdumpsp __P((struct secpolicy *, 436 u_int8_t, u_int32_t, u_int32_t)); 437 static u_int key_getspreqmsglen __P((struct secpolicy *)); 438 static int key_spdexpire __P((struct secpolicy *)); 439 static struct secashead *key_newsah __P((struct secasindex *)); 440 static void key_delsah __P((struct secashead *)); 441 static struct secasvar *key_newsav __P((struct mbuf *, 442 const struct sadb_msghdr *, struct secashead *, int *, 443 const char*, int)); 444 #define KEY_NEWSAV(m, sadb, sah, e) \ 445 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 446 static void key_delsav __P((struct secasvar *)); 447 static struct secashead *key_getsah __P((struct secasindex *)); 448 static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 449 static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 450 static int key_setsaval __P((struct secasvar *, struct mbuf *, 451 const struct sadb_msghdr *)); 452 static int key_mature __P((struct secasvar *)); 453 static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 454 u_int8_t, u_int32_t, u_int32_t)); 455 static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 456 u_int32_t, pid_t, u_int16_t)); 457 static struct mbuf *key_setsadbsa __P((struct secasvar *)); 458 static struct mbuf *key_setsadbaddr __P((u_int16_t, 459 const struct sockaddr *, u_int8_t, u_int16_t)); 460 #ifdef IPSEC_NAT_T 461 static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 462 static struct mbuf *key_setsadbxtype(u_int16_t); 463 #endif 464 static void key_porttosaddr(struct sockaddr *, u_int16_t); 465 #define KEY_PORTTOSADDR(saddr, port) \ 466 key_porttosaddr((struct sockaddr *)(saddr), (port)) 467 static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 468 static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 469 u_int32_t)); 470 static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 471 struct malloc_type *); 472 static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 473 struct malloc_type *type); 474 #ifdef INET6 475 static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 476 #endif 477 478 /* flags for key_cmpsaidx() */ 479 #define CMP_HEAD 1 /* protocol, addresses. */ 480 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 481 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 482 #define CMP_EXACTLY 4 /* all elements. */ 483 static int key_cmpsaidx 484 __P((const struct secasindex *, const struct secasindex *, int)); 485 486 static int key_cmpspidx_exactly 487 __P((struct secpolicyindex *, struct secpolicyindex *)); 488 static int key_cmpspidx_withmask 489 __P((struct secpolicyindex *, struct secpolicyindex *)); 490 static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 491 static int key_bbcmp __P((const void *, const void *, u_int)); 492 static u_int16_t key_satype2proto __P((u_int8_t)); 493 static u_int8_t key_proto2satype __P((u_int16_t)); 494 495 static int key_getspi __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497 static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 498 struct secasindex *)); 499 static int key_update __P((struct socket *, struct mbuf *, 500 const struct sadb_msghdr *)); 501 #ifdef IPSEC_DOSEQCHECK 502 static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 503 #endif 504 static int key_add __P((struct socket *, struct mbuf *, 505 const struct sadb_msghdr *)); 506 static int key_setident __P((struct secashead *, struct mbuf *, 507 const struct sadb_msghdr *)); 508 static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 509 const struct sadb_msghdr *)); 510 static int key_delete __P((struct socket *, struct mbuf *, 511 const struct sadb_msghdr *)); 512 static int key_get __P((struct socket *, struct mbuf *, 513 const struct sadb_msghdr *)); 514 515 static void key_getcomb_setlifetime __P((struct sadb_comb *)); 516 static struct mbuf *key_getcomb_esp __P((void)); 517 static struct mbuf *key_getcomb_ah __P((void)); 518 static struct mbuf *key_getcomb_ipcomp __P((void)); 519 static struct mbuf *key_getprop __P((const struct secasindex *)); 520 521 static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 522 static struct secacq *key_newacq __P((const struct secasindex *)); 523 static struct secacq *key_getacq __P((const struct secasindex *)); 524 static struct secacq *key_getacqbyseq __P((u_int32_t)); 525 static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 526 static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 527 static int key_acquire2 __P((struct socket *, struct mbuf *, 528 const struct sadb_msghdr *)); 529 static int key_register __P((struct socket *, struct mbuf *, 530 const struct sadb_msghdr *)); 531 static int key_expire __P((struct secasvar *)); 532 static int key_flush __P((struct socket *, struct mbuf *, 533 const struct sadb_msghdr *)); 534 static int key_dump __P((struct socket *, struct mbuf *, 535 const struct sadb_msghdr *)); 536 static int key_promisc __P((struct socket *, struct mbuf *, 537 const struct sadb_msghdr *)); 538 static int key_senderror __P((struct socket *, struct mbuf *, int)); 539 static int key_validate_ext __P((const struct sadb_ext *, int)); 540 static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 541 static struct mbuf *key_setlifetime(struct seclifetime *src, 542 u_int16_t exttype); 543 static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 544 545 #if 0 546 static const char *key_getfqdn __P((void)); 547 static const char *key_getuserfqdn __P((void)); 548 #endif 549 static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 550 static struct mbuf *key_alloc_mbuf __P((int)); 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, int tag) 616 { 617 struct secpolicy *sp; 618 619 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 620 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 621 ("invalid direction %u", dir)); 622 623 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 624 printf("DP %s from %s:%u\n", __func__, where, tag)); 625 626 /* get a SP entry */ 627 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 628 printf("*** objects\n"); 629 kdebug_secpolicyindex(spidx)); 630 631 SPTREE_LOCK(); 632 LIST_FOREACH(sp, &V_sptree[dir], chain) { 633 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 634 printf("*** in SPD\n"); 635 kdebug_secpolicyindex(&sp->spidx)); 636 637 if (sp->state == IPSEC_SPSTATE_DEAD) 638 continue; 639 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 640 goto found; 641 } 642 sp = NULL; 643 found: 644 if (sp) { 645 /* sanity check */ 646 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 647 648 /* found a SPD entry */ 649 sp->lastused = time_second; 650 SP_ADDREF(sp); 651 } 652 SPTREE_UNLOCK(); 653 654 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 655 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 656 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 657 return sp; 658 } 659 660 /* 661 * allocating a SP for OUTBOUND or INBOUND packet. 662 * Must call key_freesp() later. 663 * OUT: NULL: not found 664 * others: found and return the pointer. 665 */ 666 struct secpolicy * 667 key_allocsp2(u_int32_t spi, 668 union sockaddr_union *dst, 669 u_int8_t proto, 670 u_int dir, 671 const char* where, int tag) 672 { 673 struct secpolicy *sp; 674 675 IPSEC_ASSERT(dst != NULL, ("null dst")); 676 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 677 ("invalid direction %u", dir)); 678 679 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 680 printf("DP %s from %s:%u\n", __func__, where, tag)); 681 682 /* get a SP entry */ 683 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 684 printf("*** objects\n"); 685 printf("spi %u proto %u dir %u\n", spi, proto, dir); 686 kdebug_sockaddr(&dst->sa)); 687 688 SPTREE_LOCK(); 689 LIST_FOREACH(sp, &V_sptree[dir], chain) { 690 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 691 printf("*** in SPD\n"); 692 kdebug_secpolicyindex(&sp->spidx)); 693 694 if (sp->state == IPSEC_SPSTATE_DEAD) 695 continue; 696 /* compare simple values, then dst address */ 697 if (sp->spidx.ul_proto != proto) 698 continue; 699 /* NB: spi's must exist and match */ 700 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 701 continue; 702 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 703 goto found; 704 } 705 sp = NULL; 706 found: 707 if (sp) { 708 /* sanity check */ 709 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 710 711 /* found a SPD entry */ 712 sp->lastused = time_second; 713 SP_ADDREF(sp); 714 } 715 SPTREE_UNLOCK(); 716 717 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 718 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 719 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 720 return sp; 721 } 722 723 #if 0 724 /* 725 * return a policy that matches this particular inbound packet. 726 * XXX slow 727 */ 728 struct secpolicy * 729 key_gettunnel(const struct sockaddr *osrc, 730 const struct sockaddr *odst, 731 const struct sockaddr *isrc, 732 const struct sockaddr *idst, 733 const char* where, int tag) 734 { 735 struct secpolicy *sp; 736 const int dir = IPSEC_DIR_INBOUND; 737 struct ipsecrequest *r1, *r2, *p; 738 struct secpolicyindex spidx; 739 740 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 741 printf("DP %s from %s:%u\n", __func__, where, tag)); 742 743 if (isrc->sa_family != idst->sa_family) { 744 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 745 __func__, isrc->sa_family, idst->sa_family)); 746 sp = NULL; 747 goto done; 748 } 749 750 SPTREE_LOCK(); 751 LIST_FOREACH(sp, &V_sptree[dir], chain) { 752 if (sp->state == IPSEC_SPSTATE_DEAD) 753 continue; 754 755 r1 = r2 = NULL; 756 for (p = sp->req; p; p = p->next) { 757 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 758 continue; 759 760 r1 = r2; 761 r2 = p; 762 763 if (!r1) { 764 /* here we look at address matches only */ 765 spidx = sp->spidx; 766 if (isrc->sa_len > sizeof(spidx.src) || 767 idst->sa_len > sizeof(spidx.dst)) 768 continue; 769 bcopy(isrc, &spidx.src, isrc->sa_len); 770 bcopy(idst, &spidx.dst, idst->sa_len); 771 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 772 continue; 773 } else { 774 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 775 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 776 continue; 777 } 778 779 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 780 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 781 continue; 782 783 goto found; 784 } 785 } 786 sp = NULL; 787 found: 788 if (sp) { 789 sp->lastused = time_second; 790 SP_ADDREF(sp); 791 } 792 SPTREE_UNLOCK(); 793 done: 794 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 795 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 796 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 797 return sp; 798 } 799 #endif 800 801 /* 802 * allocating an SA entry for an *OUTBOUND* packet. 803 * checking each request entries in SP, and acquire an SA if need. 804 * OUT: 0: there are valid requests. 805 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 806 */ 807 int 808 key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 809 { 810 u_int level; 811 int error; 812 813 IPSEC_ASSERT(isr != NULL, ("null isr")); 814 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 815 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 816 saidx->mode == IPSEC_MODE_TUNNEL, 817 ("unexpected policy %u", saidx->mode)); 818 819 /* 820 * XXX guard against protocol callbacks from the crypto 821 * thread as they reference ipsecrequest.sav which we 822 * temporarily null out below. Need to rethink how we 823 * handle bundled SA's in the callback thread. 824 */ 825 IPSECREQUEST_LOCK_ASSERT(isr); 826 827 /* get current level */ 828 level = ipsec_get_reqlevel(isr); 829 #if 0 830 /* 831 * We do allocate new SA only if the state of SA in the holder is 832 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 833 */ 834 if (isr->sav != NULL) { 835 if (isr->sav->sah == NULL) 836 panic("%s: sah is null.\n", __func__); 837 if (isr->sav == (struct secasvar *)LIST_FIRST( 838 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 839 KEY_FREESAV(&isr->sav); 840 isr->sav = NULL; 841 } 842 } 843 #else 844 /* 845 * we free any SA stashed in the IPsec request because a different 846 * SA may be involved each time this request is checked, either 847 * because new SAs are being configured, or this request is 848 * associated with an unconnected datagram socket, or this request 849 * is associated with a system default policy. 850 * 851 * The operation may have negative impact to performance. We may 852 * want to check cached SA carefully, rather than picking new SA 853 * every time. 854 */ 855 if (isr->sav != NULL) { 856 KEY_FREESAV(&isr->sav); 857 isr->sav = NULL; 858 } 859 #endif 860 861 /* 862 * new SA allocation if no SA found. 863 * key_allocsa_policy should allocate the oldest SA available. 864 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 865 */ 866 if (isr->sav == NULL) 867 isr->sav = key_allocsa_policy(saidx); 868 869 /* When there is SA. */ 870 if (isr->sav != NULL) { 871 if (isr->sav->state != SADB_SASTATE_MATURE && 872 isr->sav->state != SADB_SASTATE_DYING) 873 return EINVAL; 874 return 0; 875 } 876 877 /* there is no SA */ 878 error = key_acquire(saidx, isr->sp); 879 if (error != 0) { 880 /* XXX What should I do ? */ 881 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 882 __func__, error)); 883 return error; 884 } 885 886 if (level != IPSEC_LEVEL_REQUIRE) { 887 /* XXX sigh, the interface to this routine is botched */ 888 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 889 return 0; 890 } else { 891 return ENOENT; 892 } 893 } 894 895 /* 896 * allocating a SA for policy entry from SAD. 897 * NOTE: searching SAD of aliving state. 898 * OUT: NULL: not found. 899 * others: found and return the pointer. 900 */ 901 static struct secasvar * 902 key_allocsa_policy(const struct secasindex *saidx) 903 { 904 #define N(a) _ARRAYLEN(a) 905 struct secashead *sah; 906 struct secasvar *sav; 907 u_int stateidx, arraysize; 908 const u_int *state_valid; 909 910 SAHTREE_LOCK(); 911 LIST_FOREACH(sah, &V_sahtree, chain) { 912 if (sah->state == SADB_SASTATE_DEAD) 913 continue; 914 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 915 if (V_key_preferred_oldsa) { 916 state_valid = saorder_state_valid_prefer_old; 917 arraysize = N(saorder_state_valid_prefer_old); 918 } else { 919 state_valid = saorder_state_valid_prefer_new; 920 arraysize = N(saorder_state_valid_prefer_new); 921 } 922 SAHTREE_UNLOCK(); 923 goto found; 924 } 925 } 926 SAHTREE_UNLOCK(); 927 928 return NULL; 929 930 found: 931 /* search valid state */ 932 for (stateidx = 0; stateidx < arraysize; stateidx++) { 933 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 934 if (sav != NULL) 935 return sav; 936 } 937 938 return NULL; 939 #undef N 940 } 941 942 /* 943 * searching SAD with direction, protocol, mode and state. 944 * called by key_allocsa_policy(). 945 * OUT: 946 * NULL : not found 947 * others : found, pointer to a SA. 948 */ 949 static struct secasvar * 950 key_do_allocsa_policy(struct secashead *sah, u_int state) 951 { 952 struct secasvar *sav, *nextsav, *candidate, *d; 953 954 /* initilize */ 955 candidate = NULL; 956 957 SAHTREE_LOCK(); 958 for (sav = LIST_FIRST(&sah->savtree[state]); 959 sav != NULL; 960 sav = nextsav) { 961 962 nextsav = LIST_NEXT(sav, chain); 963 964 /* sanity check */ 965 KEY_CHKSASTATE(sav->state, state, __func__); 966 967 /* initialize */ 968 if (candidate == NULL) { 969 candidate = sav; 970 continue; 971 } 972 973 /* Which SA is the better ? */ 974 975 IPSEC_ASSERT(candidate->lft_c != NULL, 976 ("null candidate lifetime")); 977 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 978 979 /* What the best method is to compare ? */ 980 if (V_key_preferred_oldsa) { 981 if (candidate->lft_c->addtime > 982 sav->lft_c->addtime) { 983 candidate = sav; 984 } 985 continue; 986 /*NOTREACHED*/ 987 } 988 989 /* preferred new sa rather than old sa */ 990 if (candidate->lft_c->addtime < 991 sav->lft_c->addtime) { 992 d = candidate; 993 candidate = sav; 994 } else 995 d = sav; 996 997 /* 998 * prepared to delete the SA when there is more 999 * suitable candidate and the lifetime of the SA is not 1000 * permanent. 1001 */ 1002 if (d->lft_h->addtime != 0) { 1003 struct mbuf *m, *result; 1004 u_int8_t satype; 1005 1006 key_sa_chgstate(d, SADB_SASTATE_DEAD); 1007 1008 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 1009 1010 satype = key_proto2satype(d->sah->saidx.proto); 1011 if (satype == 0) 1012 goto msgfail; 1013 1014 m = key_setsadbmsg(SADB_DELETE, 0, 1015 satype, 0, 0, d->refcnt - 1); 1016 if (!m) 1017 goto msgfail; 1018 result = m; 1019 1020 /* set sadb_address for saidx's. */ 1021 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1022 &d->sah->saidx.src.sa, 1023 d->sah->saidx.src.sa.sa_len << 3, 1024 IPSEC_ULPROTO_ANY); 1025 if (!m) 1026 goto msgfail; 1027 m_cat(result, m); 1028 1029 /* set sadb_address for saidx's. */ 1030 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1031 &d->sah->saidx.dst.sa, 1032 d->sah->saidx.dst.sa.sa_len << 3, 1033 IPSEC_ULPROTO_ANY); 1034 if (!m) 1035 goto msgfail; 1036 m_cat(result, m); 1037 1038 /* create SA extension */ 1039 m = key_setsadbsa(d); 1040 if (!m) 1041 goto msgfail; 1042 m_cat(result, m); 1043 1044 if (result->m_len < sizeof(struct sadb_msg)) { 1045 result = m_pullup(result, 1046 sizeof(struct sadb_msg)); 1047 if (result == NULL) 1048 goto msgfail; 1049 } 1050 1051 result->m_pkthdr.len = 0; 1052 for (m = result; m; m = m->m_next) 1053 result->m_pkthdr.len += m->m_len; 1054 mtod(result, struct sadb_msg *)->sadb_msg_len = 1055 PFKEY_UNIT64(result->m_pkthdr.len); 1056 1057 if (key_sendup_mbuf(NULL, result, 1058 KEY_SENDUP_REGISTERED)) 1059 goto msgfail; 1060 msgfail: 1061 KEY_FREESAV(&d); 1062 } 1063 } 1064 if (candidate) { 1065 sa_addref(candidate); 1066 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1067 printf("DP %s cause refcnt++:%d SA:%p\n", 1068 __func__, candidate->refcnt, candidate)); 1069 } 1070 SAHTREE_UNLOCK(); 1071 1072 return candidate; 1073 } 1074 1075 /* 1076 * allocating a usable SA entry for a *INBOUND* packet. 1077 * Must call key_freesav() later. 1078 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1079 * NULL: not found, or error occured. 1080 * 1081 * In the comparison, no source address is used--for RFC2401 conformance. 1082 * To quote, from section 4.1: 1083 * A security association is uniquely identified by a triple consisting 1084 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1085 * security protocol (AH or ESP) identifier. 1086 * Note that, however, we do need to keep source address in IPsec SA. 1087 * IKE specification and PF_KEY specification do assume that we 1088 * keep source address in IPsec SA. We see a tricky situation here. 1089 */ 1090 struct secasvar * 1091 key_allocsa( 1092 union sockaddr_union *dst, 1093 u_int proto, 1094 u_int32_t spi, 1095 const char* where, int tag) 1096 { 1097 struct secashead *sah; 1098 struct secasvar *sav; 1099 u_int stateidx, arraysize, state; 1100 const u_int *saorder_state_valid; 1101 int chkport; 1102 1103 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1104 1105 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1106 printf("DP %s from %s:%u\n", __func__, where, tag)); 1107 1108 #ifdef IPSEC_NAT_T 1109 chkport = (dst->sa.sa_family == AF_INET && 1110 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1111 dst->sin.sin_port != 0); 1112 #else 1113 chkport = 0; 1114 #endif 1115 1116 /* 1117 * searching SAD. 1118 * XXX: to be checked internal IP header somewhere. Also when 1119 * IPsec tunnel packet is received. But ESP tunnel mode is 1120 * encrypted so we can't check internal IP header. 1121 */ 1122 SAHTREE_LOCK(); 1123 if (V_key_preferred_oldsa) { 1124 saorder_state_valid = saorder_state_valid_prefer_old; 1125 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1126 } else { 1127 saorder_state_valid = saorder_state_valid_prefer_new; 1128 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1129 } 1130 LIST_FOREACH(sah, &V_sahtree, chain) { 1131 /* search valid state */ 1132 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1133 state = saorder_state_valid[stateidx]; 1134 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1135 /* sanity check */ 1136 KEY_CHKSASTATE(sav->state, state, __func__); 1137 /* do not return entries w/ unusable state */ 1138 if (sav->state != SADB_SASTATE_MATURE && 1139 sav->state != SADB_SASTATE_DYING) 1140 continue; 1141 if (proto != sav->sah->saidx.proto) 1142 continue; 1143 if (spi != sav->spi) 1144 continue; 1145 #if 0 /* don't check src */ 1146 /* check src address */ 1147 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, chkport) != 0) 1148 continue; 1149 #endif 1150 /* check dst address */ 1151 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, chkport) != 0) 1152 continue; 1153 sa_addref(sav); 1154 goto done; 1155 } 1156 } 1157 } 1158 sav = NULL; 1159 done: 1160 SAHTREE_UNLOCK(); 1161 1162 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1163 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1164 sav, sav ? sav->refcnt : 0)); 1165 return sav; 1166 } 1167 1168 /* 1169 * Must be called after calling key_allocsp(). 1170 * For both the packet without socket and key_freeso(). 1171 */ 1172 void 1173 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1174 { 1175 struct secpolicy *sp = *spp; 1176 1177 IPSEC_ASSERT(sp != NULL, ("null sp")); 1178 1179 SPTREE_LOCK(); 1180 SP_DELREF(sp); 1181 1182 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1183 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1184 __func__, sp, sp->id, where, tag, sp->refcnt)); 1185 1186 if (sp->refcnt == 0) { 1187 *spp = NULL; 1188 key_delsp(sp); 1189 } 1190 SPTREE_UNLOCK(); 1191 } 1192 1193 /* 1194 * Must be called after calling key_allocsp(). 1195 * For the packet with socket. 1196 */ 1197 void 1198 key_freeso(struct socket *so) 1199 { 1200 IPSEC_ASSERT(so != NULL, ("null so")); 1201 1202 switch (so->so_proto->pr_domain->dom_family) { 1203 #if defined(INET) || defined(INET6) 1204 #ifdef INET 1205 case PF_INET: 1206 #endif 1207 #ifdef INET6 1208 case PF_INET6: 1209 #endif 1210 { 1211 struct inpcb *pcb = sotoinpcb(so); 1212 1213 /* Does it have a PCB ? */ 1214 if (pcb == NULL) 1215 return; 1216 key_freesp_so(&pcb->inp_sp->sp_in); 1217 key_freesp_so(&pcb->inp_sp->sp_out); 1218 } 1219 break; 1220 #endif /* INET || INET6 */ 1221 default: 1222 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1223 __func__, so->so_proto->pr_domain->dom_family)); 1224 return; 1225 } 1226 } 1227 1228 static void 1229 key_freesp_so(struct secpolicy **sp) 1230 { 1231 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1232 1233 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1234 (*sp)->policy == IPSEC_POLICY_BYPASS) 1235 return; 1236 1237 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1238 ("invalid policy %u", (*sp)->policy)); 1239 KEY_FREESP(sp); 1240 } 1241 1242 /* 1243 * Must be called after calling key_allocsa(). 1244 * This function is called by key_freesp() to free some SA allocated 1245 * for a policy. 1246 */ 1247 void 1248 key_freesav(struct secasvar **psav, const char* where, int tag) 1249 { 1250 struct secasvar *sav = *psav; 1251 1252 IPSEC_ASSERT(sav != NULL, ("null sav")); 1253 1254 if (sa_delref(sav)) { 1255 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1256 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1257 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1258 *psav = NULL; 1259 key_delsav(sav); 1260 } else { 1261 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1262 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1263 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1264 } 1265 } 1266 1267 /* %%% SPD management */ 1268 /* 1269 * free security policy entry. 1270 */ 1271 static void 1272 key_delsp(struct secpolicy *sp) 1273 { 1274 struct ipsecrequest *isr, *nextisr; 1275 1276 IPSEC_ASSERT(sp != NULL, ("null sp")); 1277 SPTREE_LOCK_ASSERT(); 1278 1279 sp->state = IPSEC_SPSTATE_DEAD; 1280 1281 IPSEC_ASSERT(sp->refcnt == 0, 1282 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1283 1284 /* remove from SP index */ 1285 if (__LIST_CHAINED(sp)) 1286 LIST_REMOVE(sp, chain); 1287 1288 for (isr = sp->req; isr != NULL; isr = nextisr) { 1289 if (isr->sav != NULL) { 1290 KEY_FREESAV(&isr->sav); 1291 isr->sav = NULL; 1292 } 1293 1294 nextisr = isr->next; 1295 ipsec_delisr(isr); 1296 } 1297 _key_delsp(sp); 1298 } 1299 1300 /* 1301 * search SPD 1302 * OUT: NULL : not found 1303 * others : found, pointer to a SP. 1304 */ 1305 static struct secpolicy * 1306 key_getsp(struct secpolicyindex *spidx) 1307 { 1308 struct secpolicy *sp; 1309 1310 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1311 1312 SPTREE_LOCK(); 1313 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1314 if (sp->state == IPSEC_SPSTATE_DEAD) 1315 continue; 1316 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1317 SP_ADDREF(sp); 1318 break; 1319 } 1320 } 1321 SPTREE_UNLOCK(); 1322 1323 return sp; 1324 } 1325 1326 /* 1327 * get SP by index. 1328 * OUT: NULL : not found 1329 * others : found, pointer to a SP. 1330 */ 1331 static struct secpolicy * 1332 key_getspbyid(u_int32_t id) 1333 { 1334 struct secpolicy *sp; 1335 1336 SPTREE_LOCK(); 1337 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1338 if (sp->state == IPSEC_SPSTATE_DEAD) 1339 continue; 1340 if (sp->id == id) { 1341 SP_ADDREF(sp); 1342 goto done; 1343 } 1344 } 1345 1346 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1347 if (sp->state == IPSEC_SPSTATE_DEAD) 1348 continue; 1349 if (sp->id == id) { 1350 SP_ADDREF(sp); 1351 goto done; 1352 } 1353 } 1354 done: 1355 SPTREE_UNLOCK(); 1356 1357 return sp; 1358 } 1359 1360 struct secpolicy * 1361 key_newsp(const char* where, int tag) 1362 { 1363 struct secpolicy *newsp = NULL; 1364 1365 newsp = (struct secpolicy *) 1366 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1367 if (newsp) { 1368 SECPOLICY_LOCK_INIT(newsp); 1369 newsp->refcnt = 1; 1370 newsp->req = NULL; 1371 } 1372 1373 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1374 printf("DP %s from %s:%u return SP:%p\n", __func__, 1375 where, tag, newsp)); 1376 return newsp; 1377 } 1378 1379 static void 1380 _key_delsp(struct secpolicy *sp) 1381 { 1382 SECPOLICY_LOCK_DESTROY(sp); 1383 free(sp, M_IPSEC_SP); 1384 } 1385 1386 /* 1387 * create secpolicy structure from sadb_x_policy structure. 1388 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1389 * so must be set properly later. 1390 */ 1391 struct secpolicy * 1392 key_msg2sp(xpl0, len, error) 1393 struct sadb_x_policy *xpl0; 1394 size_t len; 1395 int *error; 1396 { 1397 struct secpolicy *newsp; 1398 1399 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1400 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1401 1402 if (len != PFKEY_EXTLEN(xpl0)) { 1403 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1404 *error = EINVAL; 1405 return NULL; 1406 } 1407 1408 if ((newsp = KEY_NEWSP()) == NULL) { 1409 *error = ENOBUFS; 1410 return NULL; 1411 } 1412 1413 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1414 newsp->policy = xpl0->sadb_x_policy_type; 1415 1416 /* check policy */ 1417 switch (xpl0->sadb_x_policy_type) { 1418 case IPSEC_POLICY_DISCARD: 1419 case IPSEC_POLICY_NONE: 1420 case IPSEC_POLICY_ENTRUST: 1421 case IPSEC_POLICY_BYPASS: 1422 newsp->req = NULL; 1423 break; 1424 1425 case IPSEC_POLICY_IPSEC: 1426 { 1427 int tlen; 1428 struct sadb_x_ipsecrequest *xisr; 1429 struct ipsecrequest **p_isr = &newsp->req; 1430 1431 /* validity check */ 1432 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1433 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1434 __func__)); 1435 KEY_FREESP(&newsp); 1436 *error = EINVAL; 1437 return NULL; 1438 } 1439 1440 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1441 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1442 1443 while (tlen > 0) { 1444 /* length check */ 1445 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1446 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1447 "length.\n", __func__)); 1448 KEY_FREESP(&newsp); 1449 *error = EINVAL; 1450 return NULL; 1451 } 1452 1453 /* allocate request buffer */ 1454 /* NB: data structure is zero'd */ 1455 *p_isr = ipsec_newisr(); 1456 if ((*p_isr) == NULL) { 1457 ipseclog((LOG_DEBUG, 1458 "%s: No more memory.\n", __func__)); 1459 KEY_FREESP(&newsp); 1460 *error = ENOBUFS; 1461 return NULL; 1462 } 1463 1464 /* set values */ 1465 switch (xisr->sadb_x_ipsecrequest_proto) { 1466 case IPPROTO_ESP: 1467 case IPPROTO_AH: 1468 case IPPROTO_IPCOMP: 1469 break; 1470 default: 1471 ipseclog((LOG_DEBUG, 1472 "%s: invalid proto type=%u\n", __func__, 1473 xisr->sadb_x_ipsecrequest_proto)); 1474 KEY_FREESP(&newsp); 1475 *error = EPROTONOSUPPORT; 1476 return NULL; 1477 } 1478 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1479 1480 switch (xisr->sadb_x_ipsecrequest_mode) { 1481 case IPSEC_MODE_TRANSPORT: 1482 case IPSEC_MODE_TUNNEL: 1483 break; 1484 case IPSEC_MODE_ANY: 1485 default: 1486 ipseclog((LOG_DEBUG, 1487 "%s: invalid mode=%u\n", __func__, 1488 xisr->sadb_x_ipsecrequest_mode)); 1489 KEY_FREESP(&newsp); 1490 *error = EINVAL; 1491 return NULL; 1492 } 1493 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1494 1495 switch (xisr->sadb_x_ipsecrequest_level) { 1496 case IPSEC_LEVEL_DEFAULT: 1497 case IPSEC_LEVEL_USE: 1498 case IPSEC_LEVEL_REQUIRE: 1499 break; 1500 case IPSEC_LEVEL_UNIQUE: 1501 /* validity check */ 1502 /* 1503 * If range violation of reqid, kernel will 1504 * update it, don't refuse it. 1505 */ 1506 if (xisr->sadb_x_ipsecrequest_reqid 1507 > IPSEC_MANUAL_REQID_MAX) { 1508 ipseclog((LOG_DEBUG, 1509 "%s: reqid=%d range " 1510 "violation, updated by kernel.\n", 1511 __func__, 1512 xisr->sadb_x_ipsecrequest_reqid)); 1513 xisr->sadb_x_ipsecrequest_reqid = 0; 1514 } 1515 1516 /* allocate new reqid id if reqid is zero. */ 1517 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1518 u_int32_t reqid; 1519 if ((reqid = key_newreqid()) == 0) { 1520 KEY_FREESP(&newsp); 1521 *error = ENOBUFS; 1522 return NULL; 1523 } 1524 (*p_isr)->saidx.reqid = reqid; 1525 xisr->sadb_x_ipsecrequest_reqid = reqid; 1526 } else { 1527 /* set it for manual keying. */ 1528 (*p_isr)->saidx.reqid = 1529 xisr->sadb_x_ipsecrequest_reqid; 1530 } 1531 break; 1532 1533 default: 1534 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1535 __func__, 1536 xisr->sadb_x_ipsecrequest_level)); 1537 KEY_FREESP(&newsp); 1538 *error = EINVAL; 1539 return NULL; 1540 } 1541 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1542 1543 /* set IP addresses if there */ 1544 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1545 struct sockaddr *paddr; 1546 1547 paddr = (struct sockaddr *)(xisr + 1); 1548 1549 /* validity check */ 1550 if (paddr->sa_len 1551 > sizeof((*p_isr)->saidx.src)) { 1552 ipseclog((LOG_DEBUG, "%s: invalid " 1553 "request address length.\n", 1554 __func__)); 1555 KEY_FREESP(&newsp); 1556 *error = EINVAL; 1557 return NULL; 1558 } 1559 bcopy(paddr, &(*p_isr)->saidx.src, 1560 paddr->sa_len); 1561 1562 paddr = (struct sockaddr *)((caddr_t)paddr 1563 + paddr->sa_len); 1564 1565 /* validity check */ 1566 if (paddr->sa_len 1567 > sizeof((*p_isr)->saidx.dst)) { 1568 ipseclog((LOG_DEBUG, "%s: invalid " 1569 "request address length.\n", 1570 __func__)); 1571 KEY_FREESP(&newsp); 1572 *error = EINVAL; 1573 return NULL; 1574 } 1575 bcopy(paddr, &(*p_isr)->saidx.dst, 1576 paddr->sa_len); 1577 } 1578 1579 (*p_isr)->sp = newsp; 1580 1581 /* initialization for the next. */ 1582 p_isr = &(*p_isr)->next; 1583 tlen -= xisr->sadb_x_ipsecrequest_len; 1584 1585 /* validity check */ 1586 if (tlen < 0) { 1587 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1588 __func__)); 1589 KEY_FREESP(&newsp); 1590 *error = EINVAL; 1591 return NULL; 1592 } 1593 1594 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1595 + xisr->sadb_x_ipsecrequest_len); 1596 } 1597 } 1598 break; 1599 default: 1600 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1601 KEY_FREESP(&newsp); 1602 *error = EINVAL; 1603 return NULL; 1604 } 1605 1606 *error = 0; 1607 return newsp; 1608 } 1609 1610 static u_int32_t 1611 key_newreqid() 1612 { 1613 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1614 1615 auto_reqid = (auto_reqid == ~0 1616 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1617 1618 /* XXX should be unique check */ 1619 1620 return auto_reqid; 1621 } 1622 1623 /* 1624 * copy secpolicy struct to sadb_x_policy structure indicated. 1625 */ 1626 struct mbuf * 1627 key_sp2msg(sp) 1628 struct secpolicy *sp; 1629 { 1630 struct sadb_x_policy *xpl; 1631 int tlen; 1632 caddr_t p; 1633 struct mbuf *m; 1634 1635 IPSEC_ASSERT(sp != NULL, ("null policy")); 1636 1637 tlen = key_getspreqmsglen(sp); 1638 1639 m = key_alloc_mbuf(tlen); 1640 if (!m || m->m_next) { /*XXX*/ 1641 if (m) 1642 m_freem(m); 1643 return NULL; 1644 } 1645 1646 m->m_len = tlen; 1647 m->m_next = NULL; 1648 xpl = mtod(m, struct sadb_x_policy *); 1649 bzero(xpl, tlen); 1650 1651 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1652 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1653 xpl->sadb_x_policy_type = sp->policy; 1654 xpl->sadb_x_policy_dir = sp->spidx.dir; 1655 xpl->sadb_x_policy_id = sp->id; 1656 p = (caddr_t)xpl + sizeof(*xpl); 1657 1658 /* if is the policy for ipsec ? */ 1659 if (sp->policy == IPSEC_POLICY_IPSEC) { 1660 struct sadb_x_ipsecrequest *xisr; 1661 struct ipsecrequest *isr; 1662 1663 for (isr = sp->req; isr != NULL; isr = isr->next) { 1664 1665 xisr = (struct sadb_x_ipsecrequest *)p; 1666 1667 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1668 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1669 xisr->sadb_x_ipsecrequest_level = isr->level; 1670 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1671 1672 p += sizeof(*xisr); 1673 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1674 p += isr->saidx.src.sa.sa_len; 1675 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1676 p += isr->saidx.src.sa.sa_len; 1677 1678 xisr->sadb_x_ipsecrequest_len = 1679 PFKEY_ALIGN8(sizeof(*xisr) 1680 + isr->saidx.src.sa.sa_len 1681 + isr->saidx.dst.sa.sa_len); 1682 } 1683 } 1684 1685 return m; 1686 } 1687 1688 /* m will not be freed nor modified */ 1689 static struct mbuf * 1690 #ifdef __STDC__ 1691 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1692 int ndeep, int nitem, ...) 1693 #else 1694 key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1695 struct mbuf *m; 1696 const struct sadb_msghdr *mhp; 1697 int ndeep; 1698 int nitem; 1699 va_dcl 1700 #endif 1701 { 1702 va_list ap; 1703 int idx; 1704 int i; 1705 struct mbuf *result = NULL, *n; 1706 int len; 1707 1708 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1709 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1710 1711 va_start(ap, nitem); 1712 for (i = 0; i < nitem; i++) { 1713 idx = va_arg(ap, int); 1714 if (idx < 0 || idx > SADB_EXT_MAX) 1715 goto fail; 1716 /* don't attempt to pull empty extension */ 1717 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1718 continue; 1719 if (idx != SADB_EXT_RESERVED && 1720 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1721 continue; 1722 1723 if (idx == SADB_EXT_RESERVED) { 1724 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1725 1726 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1727 1728 MGETHDR(n, M_DONTWAIT, MT_DATA); 1729 if (!n) 1730 goto fail; 1731 n->m_len = len; 1732 n->m_next = NULL; 1733 m_copydata(m, 0, sizeof(struct sadb_msg), 1734 mtod(n, caddr_t)); 1735 } else if (i < ndeep) { 1736 len = mhp->extlen[idx]; 1737 n = key_alloc_mbuf(len); 1738 if (!n || n->m_next) { /*XXX*/ 1739 if (n) 1740 m_freem(n); 1741 goto fail; 1742 } 1743 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1744 mtod(n, caddr_t)); 1745 } else { 1746 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1747 M_DONTWAIT); 1748 } 1749 if (n == NULL) 1750 goto fail; 1751 1752 if (result) 1753 m_cat(result, n); 1754 else 1755 result = n; 1756 } 1757 va_end(ap); 1758 1759 if ((result->m_flags & M_PKTHDR) != 0) { 1760 result->m_pkthdr.len = 0; 1761 for (n = result; n; n = n->m_next) 1762 result->m_pkthdr.len += n->m_len; 1763 } 1764 1765 return result; 1766 1767 fail: 1768 m_freem(result); 1769 return NULL; 1770 } 1771 1772 /* 1773 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1774 * add an entry to SP database, when received 1775 * <base, address(SD), (lifetime(H),) policy> 1776 * from the user(?). 1777 * Adding to SP database, 1778 * and send 1779 * <base, address(SD), (lifetime(H),) policy> 1780 * to the socket which was send. 1781 * 1782 * SPDADD set a unique policy entry. 1783 * SPDSETIDX like SPDADD without a part of policy requests. 1784 * SPDUPDATE replace a unique policy entry. 1785 * 1786 * m will always be freed. 1787 */ 1788 static int 1789 key_spdadd(so, m, mhp) 1790 struct socket *so; 1791 struct mbuf *m; 1792 const struct sadb_msghdr *mhp; 1793 { 1794 struct sadb_address *src0, *dst0; 1795 struct sadb_x_policy *xpl0, *xpl; 1796 struct sadb_lifetime *lft = NULL; 1797 struct secpolicyindex spidx; 1798 struct secpolicy *newsp; 1799 int error; 1800 1801 IPSEC_ASSERT(so != NULL, ("null socket")); 1802 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1803 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1804 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1805 1806 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1807 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1808 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1809 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1810 return key_senderror(so, m, EINVAL); 1811 } 1812 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1813 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1814 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1815 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1816 __func__)); 1817 return key_senderror(so, m, EINVAL); 1818 } 1819 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1820 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1821 < sizeof(struct sadb_lifetime)) { 1822 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1823 __func__)); 1824 return key_senderror(so, m, EINVAL); 1825 } 1826 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1827 } 1828 1829 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1830 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1831 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1832 1833 /* 1834 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1835 * we are processing traffic endpoints. 1836 */ 1837 1838 /* make secindex */ 1839 /* XXX boundary check against sa_len */ 1840 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1841 src0 + 1, 1842 dst0 + 1, 1843 src0->sadb_address_prefixlen, 1844 dst0->sadb_address_prefixlen, 1845 src0->sadb_address_proto, 1846 &spidx); 1847 1848 /* checking the direciton. */ 1849 switch (xpl0->sadb_x_policy_dir) { 1850 case IPSEC_DIR_INBOUND: 1851 case IPSEC_DIR_OUTBOUND: 1852 break; 1853 default: 1854 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1855 mhp->msg->sadb_msg_errno = EINVAL; 1856 return 0; 1857 } 1858 1859 /* check policy */ 1860 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1861 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1862 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1863 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1864 return key_senderror(so, m, EINVAL); 1865 } 1866 1867 /* policy requests are mandatory when action is ipsec. */ 1868 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1869 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1870 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1871 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1872 __func__)); 1873 return key_senderror(so, m, EINVAL); 1874 } 1875 1876 /* 1877 * checking there is SP already or not. 1878 * SPDUPDATE doesn't depend on whether there is a SP or not. 1879 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1880 * then error. 1881 */ 1882 newsp = key_getsp(&spidx); 1883 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1884 if (newsp) { 1885 SPTREE_LOCK(); 1886 newsp->state = IPSEC_SPSTATE_DEAD; 1887 SPTREE_UNLOCK(); 1888 KEY_FREESP(&newsp); 1889 } 1890 } else { 1891 if (newsp != NULL) { 1892 KEY_FREESP(&newsp); 1893 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1894 __func__)); 1895 return key_senderror(so, m, EEXIST); 1896 } 1897 } 1898 1899 /* allocation new SP entry */ 1900 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1901 return key_senderror(so, m, error); 1902 } 1903 1904 if ((newsp->id = key_getnewspid()) == 0) { 1905 _key_delsp(newsp); 1906 return key_senderror(so, m, ENOBUFS); 1907 } 1908 1909 /* XXX boundary check against sa_len */ 1910 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1911 src0 + 1, 1912 dst0 + 1, 1913 src0->sadb_address_prefixlen, 1914 dst0->sadb_address_prefixlen, 1915 src0->sadb_address_proto, 1916 &newsp->spidx); 1917 1918 /* sanity check on addr pair */ 1919 if (((struct sockaddr *)(src0 + 1))->sa_family != 1920 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1921 _key_delsp(newsp); 1922 return key_senderror(so, m, EINVAL); 1923 } 1924 if (((struct sockaddr *)(src0 + 1))->sa_len != 1925 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1926 _key_delsp(newsp); 1927 return key_senderror(so, m, EINVAL); 1928 } 1929 #if 1 1930 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1931 struct sockaddr *sa; 1932 sa = (struct sockaddr *)(src0 + 1); 1933 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1934 _key_delsp(newsp); 1935 return key_senderror(so, m, EINVAL); 1936 } 1937 } 1938 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1939 struct sockaddr *sa; 1940 sa = (struct sockaddr *)(dst0 + 1); 1941 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1942 _key_delsp(newsp); 1943 return key_senderror(so, m, EINVAL); 1944 } 1945 } 1946 #endif 1947 1948 newsp->created = time_second; 1949 newsp->lastused = newsp->created; 1950 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1951 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1952 1953 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1954 newsp->state = IPSEC_SPSTATE_ALIVE; 1955 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1956 1957 /* delete the entry in spacqtree */ 1958 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1959 struct secspacq *spacq = key_getspacq(&spidx); 1960 if (spacq != NULL) { 1961 /* reset counter in order to deletion by timehandler. */ 1962 spacq->created = time_second; 1963 spacq->count = 0; 1964 SPACQ_UNLOCK(); 1965 } 1966 } 1967 1968 { 1969 struct mbuf *n, *mpolicy; 1970 struct sadb_msg *newmsg; 1971 int off; 1972 1973 /* 1974 * Note: do not send SADB_X_EXT_NAT_T_* here: 1975 * we are sending traffic endpoints. 1976 */ 1977 1978 /* create new sadb_msg to reply. */ 1979 if (lft) { 1980 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1981 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1982 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1983 } else { 1984 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1985 SADB_X_EXT_POLICY, 1986 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1987 } 1988 if (!n) 1989 return key_senderror(so, m, ENOBUFS); 1990 1991 if (n->m_len < sizeof(*newmsg)) { 1992 n = m_pullup(n, sizeof(*newmsg)); 1993 if (!n) 1994 return key_senderror(so, m, ENOBUFS); 1995 } 1996 newmsg = mtod(n, struct sadb_msg *); 1997 newmsg->sadb_msg_errno = 0; 1998 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1999 2000 off = 0; 2001 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 2002 sizeof(*xpl), &off); 2003 if (mpolicy == NULL) { 2004 /* n is already freed */ 2005 return key_senderror(so, m, ENOBUFS); 2006 } 2007 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 2008 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 2009 m_freem(n); 2010 return key_senderror(so, m, EINVAL); 2011 } 2012 xpl->sadb_x_policy_id = newsp->id; 2013 2014 m_freem(m); 2015 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2016 } 2017 } 2018 2019 /* 2020 * get new policy id. 2021 * OUT: 2022 * 0: failure. 2023 * others: success. 2024 */ 2025 static u_int32_t 2026 key_getnewspid() 2027 { 2028 u_int32_t newid = 0; 2029 int count = V_key_spi_trycnt; /* XXX */ 2030 struct secpolicy *sp; 2031 2032 /* when requesting to allocate spi ranged */ 2033 while (count--) { 2034 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2035 2036 if ((sp = key_getspbyid(newid)) == NULL) 2037 break; 2038 2039 KEY_FREESP(&sp); 2040 } 2041 2042 if (count == 0 || newid == 0) { 2043 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2044 __func__)); 2045 return 0; 2046 } 2047 2048 return newid; 2049 } 2050 2051 /* 2052 * SADB_SPDDELETE processing 2053 * receive 2054 * <base, address(SD), policy(*)> 2055 * from the user(?), and set SADB_SASTATE_DEAD, 2056 * and send, 2057 * <base, address(SD), policy(*)> 2058 * to the ikmpd. 2059 * policy(*) including direction of policy. 2060 * 2061 * m will always be freed. 2062 */ 2063 static int 2064 key_spddelete(so, m, mhp) 2065 struct socket *so; 2066 struct mbuf *m; 2067 const struct sadb_msghdr *mhp; 2068 { 2069 struct sadb_address *src0, *dst0; 2070 struct sadb_x_policy *xpl0; 2071 struct secpolicyindex spidx; 2072 struct secpolicy *sp; 2073 2074 IPSEC_ASSERT(so != NULL, ("null so")); 2075 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2076 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2077 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2078 2079 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2080 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2081 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2082 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2083 __func__)); 2084 return key_senderror(so, m, EINVAL); 2085 } 2086 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2087 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2088 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2089 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2090 __func__)); 2091 return key_senderror(so, m, EINVAL); 2092 } 2093 2094 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2095 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2096 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2097 2098 /* 2099 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2100 * we are processing traffic endpoints. 2101 */ 2102 2103 /* make secindex */ 2104 /* XXX boundary check against sa_len */ 2105 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2106 src0 + 1, 2107 dst0 + 1, 2108 src0->sadb_address_prefixlen, 2109 dst0->sadb_address_prefixlen, 2110 src0->sadb_address_proto, 2111 &spidx); 2112 2113 /* checking the direciton. */ 2114 switch (xpl0->sadb_x_policy_dir) { 2115 case IPSEC_DIR_INBOUND: 2116 case IPSEC_DIR_OUTBOUND: 2117 break; 2118 default: 2119 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2120 return key_senderror(so, m, EINVAL); 2121 } 2122 2123 /* Is there SP in SPD ? */ 2124 if ((sp = key_getsp(&spidx)) == NULL) { 2125 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2126 return key_senderror(so, m, EINVAL); 2127 } 2128 2129 /* save policy id to buffer to be returned. */ 2130 xpl0->sadb_x_policy_id = sp->id; 2131 2132 SPTREE_LOCK(); 2133 sp->state = IPSEC_SPSTATE_DEAD; 2134 SPTREE_UNLOCK(); 2135 KEY_FREESP(&sp); 2136 2137 { 2138 struct mbuf *n; 2139 struct sadb_msg *newmsg; 2140 2141 /* 2142 * Note: do not send SADB_X_EXT_NAT_T_* here: 2143 * we are sending traffic endpoints. 2144 */ 2145 2146 /* create new sadb_msg to reply. */ 2147 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2148 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2149 if (!n) 2150 return key_senderror(so, m, ENOBUFS); 2151 2152 newmsg = mtod(n, struct sadb_msg *); 2153 newmsg->sadb_msg_errno = 0; 2154 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2155 2156 m_freem(m); 2157 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2158 } 2159 } 2160 2161 /* 2162 * SADB_SPDDELETE2 processing 2163 * receive 2164 * <base, policy(*)> 2165 * from the user(?), and set SADB_SASTATE_DEAD, 2166 * and send, 2167 * <base, policy(*)> 2168 * to the ikmpd. 2169 * policy(*) including direction of policy. 2170 * 2171 * m will always be freed. 2172 */ 2173 static int 2174 key_spddelete2(so, m, mhp) 2175 struct socket *so; 2176 struct mbuf *m; 2177 const struct sadb_msghdr *mhp; 2178 { 2179 u_int32_t id; 2180 struct secpolicy *sp; 2181 2182 IPSEC_ASSERT(so != NULL, ("null socket")); 2183 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2184 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2185 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2186 2187 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2188 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2189 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2190 return key_senderror(so, m, EINVAL); 2191 } 2192 2193 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2194 2195 /* Is there SP in SPD ? */ 2196 if ((sp = key_getspbyid(id)) == NULL) { 2197 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2198 return key_senderror(so, m, EINVAL); 2199 } 2200 2201 SPTREE_LOCK(); 2202 sp->state = IPSEC_SPSTATE_DEAD; 2203 SPTREE_UNLOCK(); 2204 KEY_FREESP(&sp); 2205 2206 { 2207 struct mbuf *n, *nn; 2208 struct sadb_msg *newmsg; 2209 int off, len; 2210 2211 /* create new sadb_msg to reply. */ 2212 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2213 2214 MGETHDR(n, M_DONTWAIT, MT_DATA); 2215 if (n && len > MHLEN) { 2216 MCLGET(n, M_DONTWAIT); 2217 if ((n->m_flags & M_EXT) == 0) { 2218 m_freem(n); 2219 n = NULL; 2220 } 2221 } 2222 if (!n) 2223 return key_senderror(so, m, ENOBUFS); 2224 2225 n->m_len = len; 2226 n->m_next = NULL; 2227 off = 0; 2228 2229 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2230 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2231 2232 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2233 off, len)); 2234 2235 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2236 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2237 if (!n->m_next) { 2238 m_freem(n); 2239 return key_senderror(so, m, ENOBUFS); 2240 } 2241 2242 n->m_pkthdr.len = 0; 2243 for (nn = n; nn; nn = nn->m_next) 2244 n->m_pkthdr.len += nn->m_len; 2245 2246 newmsg = mtod(n, struct sadb_msg *); 2247 newmsg->sadb_msg_errno = 0; 2248 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2249 2250 m_freem(m); 2251 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2252 } 2253 } 2254 2255 /* 2256 * SADB_X_GET processing 2257 * receive 2258 * <base, policy(*)> 2259 * from the user(?), 2260 * and send, 2261 * <base, address(SD), policy> 2262 * to the ikmpd. 2263 * policy(*) including direction of policy. 2264 * 2265 * m will always be freed. 2266 */ 2267 static int 2268 key_spdget(so, m, mhp) 2269 struct socket *so; 2270 struct mbuf *m; 2271 const struct sadb_msghdr *mhp; 2272 { 2273 u_int32_t id; 2274 struct secpolicy *sp; 2275 struct mbuf *n; 2276 2277 IPSEC_ASSERT(so != NULL, ("null socket")); 2278 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2279 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2280 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2281 2282 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2283 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2284 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2285 __func__)); 2286 return key_senderror(so, m, EINVAL); 2287 } 2288 2289 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2290 2291 /* Is there SP in SPD ? */ 2292 if ((sp = key_getspbyid(id)) == NULL) { 2293 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2294 return key_senderror(so, m, ENOENT); 2295 } 2296 2297 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2298 if (n != NULL) { 2299 m_freem(m); 2300 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2301 } else 2302 return key_senderror(so, m, ENOBUFS); 2303 } 2304 2305 /* 2306 * SADB_X_SPDACQUIRE processing. 2307 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2308 * send 2309 * <base, policy(*)> 2310 * to KMD, and expect to receive 2311 * <base> with SADB_X_SPDACQUIRE if error occured, 2312 * or 2313 * <base, policy> 2314 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2315 * policy(*) is without policy requests. 2316 * 2317 * 0 : succeed 2318 * others: error number 2319 */ 2320 int 2321 key_spdacquire(sp) 2322 struct secpolicy *sp; 2323 { 2324 struct mbuf *result = NULL, *m; 2325 struct secspacq *newspacq; 2326 2327 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2328 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2329 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2330 ("policy not IPSEC %u", sp->policy)); 2331 2332 /* Get an entry to check whether sent message or not. */ 2333 newspacq = key_getspacq(&sp->spidx); 2334 if (newspacq != NULL) { 2335 if (V_key_blockacq_count < newspacq->count) { 2336 /* reset counter and do send message. */ 2337 newspacq->count = 0; 2338 } else { 2339 /* increment counter and do nothing. */ 2340 newspacq->count++; 2341 return 0; 2342 } 2343 SPACQ_UNLOCK(); 2344 } else { 2345 /* make new entry for blocking to send SADB_ACQUIRE. */ 2346 newspacq = key_newspacq(&sp->spidx); 2347 if (newspacq == NULL) 2348 return ENOBUFS; 2349 } 2350 2351 /* create new sadb_msg to reply. */ 2352 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2353 if (!m) 2354 return ENOBUFS; 2355 2356 result = m; 2357 2358 result->m_pkthdr.len = 0; 2359 for (m = result; m; m = m->m_next) 2360 result->m_pkthdr.len += m->m_len; 2361 2362 mtod(result, struct sadb_msg *)->sadb_msg_len = 2363 PFKEY_UNIT64(result->m_pkthdr.len); 2364 2365 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2366 } 2367 2368 /* 2369 * SADB_SPDFLUSH processing 2370 * receive 2371 * <base> 2372 * from the user, and free all entries in secpctree. 2373 * and send, 2374 * <base> 2375 * to the user. 2376 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2377 * 2378 * m will always be freed. 2379 */ 2380 static int 2381 key_spdflush(so, m, mhp) 2382 struct socket *so; 2383 struct mbuf *m; 2384 const struct sadb_msghdr *mhp; 2385 { 2386 struct sadb_msg *newmsg; 2387 struct secpolicy *sp; 2388 u_int dir; 2389 2390 IPSEC_ASSERT(so != NULL, ("null socket")); 2391 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2392 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2393 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2394 2395 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2396 return key_senderror(so, m, EINVAL); 2397 2398 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2399 SPTREE_LOCK(); 2400 LIST_FOREACH(sp, &V_sptree[dir], chain) 2401 sp->state = IPSEC_SPSTATE_DEAD; 2402 SPTREE_UNLOCK(); 2403 } 2404 2405 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2406 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2407 return key_senderror(so, m, ENOBUFS); 2408 } 2409 2410 if (m->m_next) 2411 m_freem(m->m_next); 2412 m->m_next = NULL; 2413 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2414 newmsg = mtod(m, struct sadb_msg *); 2415 newmsg->sadb_msg_errno = 0; 2416 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2417 2418 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2419 } 2420 2421 /* 2422 * SADB_SPDDUMP processing 2423 * receive 2424 * <base> 2425 * from the user, and dump all SP leaves 2426 * and send, 2427 * <base> ..... 2428 * to the ikmpd. 2429 * 2430 * m will always be freed. 2431 */ 2432 static int 2433 key_spddump(so, m, mhp) 2434 struct socket *so; 2435 struct mbuf *m; 2436 const struct sadb_msghdr *mhp; 2437 { 2438 struct secpolicy *sp; 2439 int cnt; 2440 u_int dir; 2441 struct mbuf *n; 2442 2443 IPSEC_ASSERT(so != NULL, ("null socket")); 2444 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2445 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2446 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2447 2448 /* search SPD entry and get buffer size. */ 2449 cnt = 0; 2450 SPTREE_LOCK(); 2451 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2452 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2453 cnt++; 2454 } 2455 } 2456 2457 if (cnt == 0) { 2458 SPTREE_UNLOCK(); 2459 return key_senderror(so, m, ENOENT); 2460 } 2461 2462 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2463 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2464 --cnt; 2465 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2466 mhp->msg->sadb_msg_pid); 2467 2468 if (n) 2469 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2470 } 2471 } 2472 2473 SPTREE_UNLOCK(); 2474 m_freem(m); 2475 return 0; 2476 } 2477 2478 static struct mbuf * 2479 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2480 { 2481 struct mbuf *result = NULL, *m; 2482 struct seclifetime lt; 2483 2484 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2485 if (!m) 2486 goto fail; 2487 result = m; 2488 2489 /* 2490 * Note: do not send SADB_X_EXT_NAT_T_* here: 2491 * we are sending traffic endpoints. 2492 */ 2493 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2494 &sp->spidx.src.sa, sp->spidx.prefs, 2495 sp->spidx.ul_proto); 2496 if (!m) 2497 goto fail; 2498 m_cat(result, m); 2499 2500 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2501 &sp->spidx.dst.sa, sp->spidx.prefd, 2502 sp->spidx.ul_proto); 2503 if (!m) 2504 goto fail; 2505 m_cat(result, m); 2506 2507 m = key_sp2msg(sp); 2508 if (!m) 2509 goto fail; 2510 m_cat(result, m); 2511 2512 if(sp->lifetime){ 2513 lt.addtime=sp->created; 2514 lt.usetime= sp->lastused; 2515 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2516 if (!m) 2517 goto fail; 2518 m_cat(result, m); 2519 2520 lt.addtime=sp->lifetime; 2521 lt.usetime= sp->validtime; 2522 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2523 if (!m) 2524 goto fail; 2525 m_cat(result, m); 2526 } 2527 2528 if ((result->m_flags & M_PKTHDR) == 0) 2529 goto fail; 2530 2531 if (result->m_len < sizeof(struct sadb_msg)) { 2532 result = m_pullup(result, sizeof(struct sadb_msg)); 2533 if (result == NULL) 2534 goto fail; 2535 } 2536 2537 result->m_pkthdr.len = 0; 2538 for (m = result; m; m = m->m_next) 2539 result->m_pkthdr.len += m->m_len; 2540 2541 mtod(result, struct sadb_msg *)->sadb_msg_len = 2542 PFKEY_UNIT64(result->m_pkthdr.len); 2543 2544 return result; 2545 2546 fail: 2547 m_freem(result); 2548 return NULL; 2549 } 2550 2551 /* 2552 * get PFKEY message length for security policy and request. 2553 */ 2554 static u_int 2555 key_getspreqmsglen(sp) 2556 struct secpolicy *sp; 2557 { 2558 u_int tlen; 2559 2560 tlen = sizeof(struct sadb_x_policy); 2561 2562 /* if is the policy for ipsec ? */ 2563 if (sp->policy != IPSEC_POLICY_IPSEC) 2564 return tlen; 2565 2566 /* get length of ipsec requests */ 2567 { 2568 struct ipsecrequest *isr; 2569 int len; 2570 2571 for (isr = sp->req; isr != NULL; isr = isr->next) { 2572 len = sizeof(struct sadb_x_ipsecrequest) 2573 + isr->saidx.src.sa.sa_len 2574 + isr->saidx.dst.sa.sa_len; 2575 2576 tlen += PFKEY_ALIGN8(len); 2577 } 2578 } 2579 2580 return tlen; 2581 } 2582 2583 /* 2584 * SADB_SPDEXPIRE processing 2585 * send 2586 * <base, address(SD), lifetime(CH), policy> 2587 * to KMD by PF_KEY. 2588 * 2589 * OUT: 0 : succeed 2590 * others : error number 2591 */ 2592 static int 2593 key_spdexpire(sp) 2594 struct secpolicy *sp; 2595 { 2596 struct mbuf *result = NULL, *m; 2597 int len; 2598 int error = -1; 2599 struct sadb_lifetime *lt; 2600 2601 /* XXX: Why do we lock ? */ 2602 2603 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2604 2605 /* set msg header */ 2606 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2607 if (!m) { 2608 error = ENOBUFS; 2609 goto fail; 2610 } 2611 result = m; 2612 2613 /* create lifetime extension (current and hard) */ 2614 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2615 m = key_alloc_mbuf(len); 2616 if (!m || m->m_next) { /*XXX*/ 2617 if (m) 2618 m_freem(m); 2619 error = ENOBUFS; 2620 goto fail; 2621 } 2622 bzero(mtod(m, caddr_t), len); 2623 lt = mtod(m, struct sadb_lifetime *); 2624 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2625 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2626 lt->sadb_lifetime_allocations = 0; 2627 lt->sadb_lifetime_bytes = 0; 2628 lt->sadb_lifetime_addtime = sp->created; 2629 lt->sadb_lifetime_usetime = sp->lastused; 2630 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2631 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2632 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2633 lt->sadb_lifetime_allocations = 0; 2634 lt->sadb_lifetime_bytes = 0; 2635 lt->sadb_lifetime_addtime = sp->lifetime; 2636 lt->sadb_lifetime_usetime = sp->validtime; 2637 m_cat(result, m); 2638 2639 /* 2640 * Note: do not send SADB_X_EXT_NAT_T_* here: 2641 * we are sending traffic endpoints. 2642 */ 2643 2644 /* set sadb_address for source */ 2645 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2646 &sp->spidx.src.sa, 2647 sp->spidx.prefs, sp->spidx.ul_proto); 2648 if (!m) { 2649 error = ENOBUFS; 2650 goto fail; 2651 } 2652 m_cat(result, m); 2653 2654 /* set sadb_address for destination */ 2655 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2656 &sp->spidx.dst.sa, 2657 sp->spidx.prefd, sp->spidx.ul_proto); 2658 if (!m) { 2659 error = ENOBUFS; 2660 goto fail; 2661 } 2662 m_cat(result, m); 2663 2664 /* set secpolicy */ 2665 m = key_sp2msg(sp); 2666 if (!m) { 2667 error = ENOBUFS; 2668 goto fail; 2669 } 2670 m_cat(result, m); 2671 2672 if ((result->m_flags & M_PKTHDR) == 0) { 2673 error = EINVAL; 2674 goto fail; 2675 } 2676 2677 if (result->m_len < sizeof(struct sadb_msg)) { 2678 result = m_pullup(result, sizeof(struct sadb_msg)); 2679 if (result == NULL) { 2680 error = ENOBUFS; 2681 goto fail; 2682 } 2683 } 2684 2685 result->m_pkthdr.len = 0; 2686 for (m = result; m; m = m->m_next) 2687 result->m_pkthdr.len += m->m_len; 2688 2689 mtod(result, struct sadb_msg *)->sadb_msg_len = 2690 PFKEY_UNIT64(result->m_pkthdr.len); 2691 2692 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2693 2694 fail: 2695 if (result) 2696 m_freem(result); 2697 return error; 2698 } 2699 2700 /* %%% SAD management */ 2701 /* 2702 * allocating a memory for new SA head, and copy from the values of mhp. 2703 * OUT: NULL : failure due to the lack of memory. 2704 * others : pointer to new SA head. 2705 */ 2706 static struct secashead * 2707 key_newsah(saidx) 2708 struct secasindex *saidx; 2709 { 2710 struct secashead *newsah; 2711 2712 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2713 2714 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2715 if (newsah != NULL) { 2716 int i; 2717 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2718 LIST_INIT(&newsah->savtree[i]); 2719 newsah->saidx = *saidx; 2720 2721 /* add to saidxtree */ 2722 newsah->state = SADB_SASTATE_MATURE; 2723 2724 SAHTREE_LOCK(); 2725 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2726 SAHTREE_UNLOCK(); 2727 } 2728 return(newsah); 2729 } 2730 2731 /* 2732 * delete SA index and all SA registerd. 2733 */ 2734 static void 2735 key_delsah(sah) 2736 struct secashead *sah; 2737 { 2738 struct secasvar *sav, *nextsav; 2739 u_int stateidx; 2740 int zombie = 0; 2741 2742 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2743 SAHTREE_LOCK_ASSERT(); 2744 2745 /* searching all SA registerd in the secindex. */ 2746 for (stateidx = 0; 2747 stateidx < _ARRAYLEN(saorder_state_any); 2748 stateidx++) { 2749 u_int state = saorder_state_any[stateidx]; 2750 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2751 if (sav->refcnt == 0) { 2752 /* sanity check */ 2753 KEY_CHKSASTATE(state, sav->state, __func__); 2754 /* 2755 * do NOT call KEY_FREESAV here: 2756 * it will only delete the sav if refcnt == 1, 2757 * where we already know that refcnt == 0 2758 */ 2759 key_delsav(sav); 2760 } else { 2761 /* give up to delete this sa */ 2762 zombie++; 2763 } 2764 } 2765 } 2766 if (!zombie) { /* delete only if there are savs */ 2767 /* remove from tree of SA index */ 2768 if (__LIST_CHAINED(sah)) 2769 LIST_REMOVE(sah, chain); 2770 if (sah->sa_route.ro_rt) { 2771 RTFREE(sah->sa_route.ro_rt); 2772 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2773 } 2774 free(sah, M_IPSEC_SAH); 2775 } 2776 } 2777 2778 /* 2779 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2780 * and copy the values of mhp into new buffer. 2781 * When SAD message type is GETSPI: 2782 * to set sequence number from acq_seq++, 2783 * to set zero to SPI. 2784 * not to call key_setsava(). 2785 * OUT: NULL : fail 2786 * others : pointer to new secasvar. 2787 * 2788 * does not modify mbuf. does not free mbuf on error. 2789 */ 2790 static struct secasvar * 2791 key_newsav(m, mhp, sah, errp, where, tag) 2792 struct mbuf *m; 2793 const struct sadb_msghdr *mhp; 2794 struct secashead *sah; 2795 int *errp; 2796 const char* where; 2797 int tag; 2798 { 2799 struct secasvar *newsav; 2800 const struct sadb_sa *xsa; 2801 2802 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2803 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2804 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2805 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2806 2807 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2808 if (newsav == NULL) { 2809 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2810 *errp = ENOBUFS; 2811 goto done; 2812 } 2813 2814 switch (mhp->msg->sadb_msg_type) { 2815 case SADB_GETSPI: 2816 newsav->spi = 0; 2817 2818 #ifdef IPSEC_DOSEQCHECK 2819 /* sync sequence number */ 2820 if (mhp->msg->sadb_msg_seq == 0) 2821 newsav->seq = 2822 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2823 else 2824 #endif 2825 newsav->seq = mhp->msg->sadb_msg_seq; 2826 break; 2827 2828 case SADB_ADD: 2829 /* sanity check */ 2830 if (mhp->ext[SADB_EXT_SA] == NULL) { 2831 free(newsav, M_IPSEC_SA); 2832 newsav = NULL; 2833 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2834 __func__)); 2835 *errp = EINVAL; 2836 goto done; 2837 } 2838 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2839 newsav->spi = xsa->sadb_sa_spi; 2840 newsav->seq = mhp->msg->sadb_msg_seq; 2841 break; 2842 default: 2843 free(newsav, M_IPSEC_SA); 2844 newsav = NULL; 2845 *errp = EINVAL; 2846 goto done; 2847 } 2848 2849 2850 /* copy sav values */ 2851 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2852 *errp = key_setsaval(newsav, m, mhp); 2853 if (*errp) { 2854 free(newsav, M_IPSEC_SA); 2855 newsav = NULL; 2856 goto done; 2857 } 2858 } 2859 2860 SECASVAR_LOCK_INIT(newsav); 2861 2862 /* reset created */ 2863 newsav->created = time_second; 2864 newsav->pid = mhp->msg->sadb_msg_pid; 2865 2866 /* add to satree */ 2867 newsav->sah = sah; 2868 sa_initref(newsav); 2869 newsav->state = SADB_SASTATE_LARVAL; 2870 2871 /* XXX locking??? */ 2872 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2873 secasvar, chain); 2874 done: 2875 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2876 printf("DP %s from %s:%u return SP:%p\n", __func__, 2877 where, tag, newsav)); 2878 2879 return newsav; 2880 } 2881 2882 /* 2883 * free() SA variable entry. 2884 */ 2885 static void 2886 key_cleansav(struct secasvar *sav) 2887 { 2888 /* 2889 * Cleanup xform state. Note that zeroize'ing causes the 2890 * keys to be cleared; otherwise we must do it ourself. 2891 */ 2892 if (sav->tdb_xform != NULL) { 2893 sav->tdb_xform->xf_zeroize(sav); 2894 sav->tdb_xform = NULL; 2895 } else { 2896 KASSERT(sav->iv == NULL, ("iv but no xform")); 2897 if (sav->key_auth != NULL) 2898 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2899 if (sav->key_enc != NULL) 2900 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2901 } 2902 if (sav->key_auth != NULL) { 2903 if (sav->key_auth->key_data != NULL) 2904 free(sav->key_auth->key_data, M_IPSEC_MISC); 2905 free(sav->key_auth, M_IPSEC_MISC); 2906 sav->key_auth = NULL; 2907 } 2908 if (sav->key_enc != NULL) { 2909 if (sav->key_enc->key_data != NULL) 2910 free(sav->key_enc->key_data, M_IPSEC_MISC); 2911 free(sav->key_enc, M_IPSEC_MISC); 2912 sav->key_enc = NULL; 2913 } 2914 if (sav->sched) { 2915 bzero(sav->sched, sav->schedlen); 2916 free(sav->sched, M_IPSEC_MISC); 2917 sav->sched = NULL; 2918 } 2919 if (sav->replay != NULL) { 2920 free(sav->replay, M_IPSEC_MISC); 2921 sav->replay = NULL; 2922 } 2923 if (sav->lft_c != NULL) { 2924 free(sav->lft_c, M_IPSEC_MISC); 2925 sav->lft_c = NULL; 2926 } 2927 if (sav->lft_h != NULL) { 2928 free(sav->lft_h, M_IPSEC_MISC); 2929 sav->lft_h = NULL; 2930 } 2931 if (sav->lft_s != NULL) { 2932 free(sav->lft_s, M_IPSEC_MISC); 2933 sav->lft_s = NULL; 2934 } 2935 } 2936 2937 /* 2938 * free() SA variable entry. 2939 */ 2940 static void 2941 key_delsav(sav) 2942 struct secasvar *sav; 2943 { 2944 IPSEC_ASSERT(sav != NULL, ("null sav")); 2945 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2946 2947 /* remove from SA header */ 2948 if (__LIST_CHAINED(sav)) 2949 LIST_REMOVE(sav, chain); 2950 key_cleansav(sav); 2951 SECASVAR_LOCK_DESTROY(sav); 2952 free(sav, M_IPSEC_SA); 2953 } 2954 2955 /* 2956 * search SAD. 2957 * OUT: 2958 * NULL : not found 2959 * others : found, pointer to a SA. 2960 */ 2961 static struct secashead * 2962 key_getsah(saidx) 2963 struct secasindex *saidx; 2964 { 2965 struct secashead *sah; 2966 2967 SAHTREE_LOCK(); 2968 LIST_FOREACH(sah, &V_sahtree, chain) { 2969 if (sah->state == SADB_SASTATE_DEAD) 2970 continue; 2971 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2972 break; 2973 } 2974 SAHTREE_UNLOCK(); 2975 2976 return sah; 2977 } 2978 2979 /* 2980 * check not to be duplicated SPI. 2981 * NOTE: this function is too slow due to searching all SAD. 2982 * OUT: 2983 * NULL : not found 2984 * others : found, pointer to a SA. 2985 */ 2986 static struct secasvar * 2987 key_checkspidup(saidx, spi) 2988 struct secasindex *saidx; 2989 u_int32_t spi; 2990 { 2991 struct secashead *sah; 2992 struct secasvar *sav; 2993 2994 /* check address family */ 2995 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2996 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2997 __func__)); 2998 return NULL; 2999 } 3000 3001 sav = NULL; 3002 /* check all SAD */ 3003 SAHTREE_LOCK(); 3004 LIST_FOREACH(sah, &V_sahtree, chain) { 3005 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 3006 continue; 3007 sav = key_getsavbyspi(sah, spi); 3008 if (sav != NULL) 3009 break; 3010 } 3011 SAHTREE_UNLOCK(); 3012 3013 return sav; 3014 } 3015 3016 /* 3017 * search SAD litmited alive SA, protocol, SPI. 3018 * OUT: 3019 * NULL : not found 3020 * others : found, pointer to a SA. 3021 */ 3022 static struct secasvar * 3023 key_getsavbyspi(sah, spi) 3024 struct secashead *sah; 3025 u_int32_t spi; 3026 { 3027 struct secasvar *sav; 3028 u_int stateidx, state; 3029 3030 sav = NULL; 3031 SAHTREE_LOCK_ASSERT(); 3032 /* search all status */ 3033 for (stateidx = 0; 3034 stateidx < _ARRAYLEN(saorder_state_alive); 3035 stateidx++) { 3036 3037 state = saorder_state_alive[stateidx]; 3038 LIST_FOREACH(sav, &sah->savtree[state], chain) { 3039 3040 /* sanity check */ 3041 if (sav->state != state) { 3042 ipseclog((LOG_DEBUG, "%s: " 3043 "invalid sav->state (queue: %d SA: %d)\n", 3044 __func__, state, sav->state)); 3045 continue; 3046 } 3047 3048 if (sav->spi == spi) 3049 return sav; 3050 } 3051 } 3052 3053 return NULL; 3054 } 3055 3056 /* 3057 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3058 * You must update these if need. 3059 * OUT: 0: success. 3060 * !0: failure. 3061 * 3062 * does not modify mbuf. does not free mbuf on error. 3063 */ 3064 static int 3065 key_setsaval(sav, m, mhp) 3066 struct secasvar *sav; 3067 struct mbuf *m; 3068 const struct sadb_msghdr *mhp; 3069 { 3070 int error = 0; 3071 3072 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3073 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3074 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3075 3076 /* initialization */ 3077 sav->replay = NULL; 3078 sav->key_auth = NULL; 3079 sav->key_enc = NULL; 3080 sav->sched = NULL; 3081 sav->schedlen = 0; 3082 sav->iv = NULL; 3083 sav->lft_c = NULL; 3084 sav->lft_h = NULL; 3085 sav->lft_s = NULL; 3086 sav->tdb_xform = NULL; /* transform */ 3087 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3088 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3089 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3090 /* Initialize even if NAT-T not compiled in: */ 3091 sav->natt_type = 0; 3092 sav->natt_esp_frag_len = 0; 3093 3094 /* SA */ 3095 if (mhp->ext[SADB_EXT_SA] != NULL) { 3096 const struct sadb_sa *sa0; 3097 3098 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3099 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3100 error = EINVAL; 3101 goto fail; 3102 } 3103 3104 sav->alg_auth = sa0->sadb_sa_auth; 3105 sav->alg_enc = sa0->sadb_sa_encrypt; 3106 sav->flags = sa0->sadb_sa_flags; 3107 3108 /* replay window */ 3109 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3110 sav->replay = (struct secreplay *) 3111 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3112 if (sav->replay == NULL) { 3113 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3114 __func__)); 3115 error = ENOBUFS; 3116 goto fail; 3117 } 3118 if (sa0->sadb_sa_replay != 0) 3119 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3120 sav->replay->wsize = sa0->sadb_sa_replay; 3121 } 3122 } 3123 3124 /* Authentication keys */ 3125 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3126 const struct sadb_key *key0; 3127 int len; 3128 3129 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3130 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3131 3132 error = 0; 3133 if (len < sizeof(*key0)) { 3134 error = EINVAL; 3135 goto fail; 3136 } 3137 switch (mhp->msg->sadb_msg_satype) { 3138 case SADB_SATYPE_AH: 3139 case SADB_SATYPE_ESP: 3140 case SADB_X_SATYPE_TCPSIGNATURE: 3141 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3142 sav->alg_auth != SADB_X_AALG_NULL) 3143 error = EINVAL; 3144 break; 3145 case SADB_X_SATYPE_IPCOMP: 3146 default: 3147 error = EINVAL; 3148 break; 3149 } 3150 if (error) { 3151 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3152 __func__)); 3153 goto fail; 3154 } 3155 3156 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3157 M_IPSEC_MISC); 3158 if (sav->key_auth == NULL ) { 3159 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3160 __func__)); 3161 error = ENOBUFS; 3162 goto fail; 3163 } 3164 } 3165 3166 /* Encryption key */ 3167 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3168 const struct sadb_key *key0; 3169 int len; 3170 3171 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3172 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3173 3174 error = 0; 3175 if (len < sizeof(*key0)) { 3176 error = EINVAL; 3177 goto fail; 3178 } 3179 switch (mhp->msg->sadb_msg_satype) { 3180 case SADB_SATYPE_ESP: 3181 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3182 sav->alg_enc != SADB_EALG_NULL) { 3183 error = EINVAL; 3184 break; 3185 } 3186 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3187 len, 3188 M_IPSEC_MISC); 3189 if (sav->key_enc == NULL) { 3190 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3191 __func__)); 3192 error = ENOBUFS; 3193 goto fail; 3194 } 3195 break; 3196 case SADB_X_SATYPE_IPCOMP: 3197 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3198 error = EINVAL; 3199 sav->key_enc = NULL; /*just in case*/ 3200 break; 3201 case SADB_SATYPE_AH: 3202 case SADB_X_SATYPE_TCPSIGNATURE: 3203 default: 3204 error = EINVAL; 3205 break; 3206 } 3207 if (error) { 3208 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3209 __func__)); 3210 goto fail; 3211 } 3212 } 3213 3214 /* set iv */ 3215 sav->ivlen = 0; 3216 3217 switch (mhp->msg->sadb_msg_satype) { 3218 case SADB_SATYPE_AH: 3219 error = xform_init(sav, XF_AH); 3220 break; 3221 case SADB_SATYPE_ESP: 3222 error = xform_init(sav, XF_ESP); 3223 break; 3224 case SADB_X_SATYPE_IPCOMP: 3225 error = xform_init(sav, XF_IPCOMP); 3226 break; 3227 case SADB_X_SATYPE_TCPSIGNATURE: 3228 error = xform_init(sav, XF_TCPSIGNATURE); 3229 break; 3230 } 3231 if (error) { 3232 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3233 __func__, mhp->msg->sadb_msg_satype)); 3234 goto fail; 3235 } 3236 3237 /* reset created */ 3238 sav->created = time_second; 3239 3240 /* make lifetime for CURRENT */ 3241 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3242 if (sav->lft_c == NULL) { 3243 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3244 error = ENOBUFS; 3245 goto fail; 3246 } 3247 3248 sav->lft_c->allocations = 0; 3249 sav->lft_c->bytes = 0; 3250 sav->lft_c->addtime = time_second; 3251 sav->lft_c->usetime = 0; 3252 3253 /* lifetimes for HARD and SOFT */ 3254 { 3255 const struct sadb_lifetime *lft0; 3256 3257 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3258 if (lft0 != NULL) { 3259 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3260 error = EINVAL; 3261 goto fail; 3262 } 3263 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3264 if (sav->lft_h == NULL) { 3265 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3266 error = ENOBUFS; 3267 goto fail; 3268 } 3269 /* to be initialize ? */ 3270 } 3271 3272 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3273 if (lft0 != NULL) { 3274 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3275 error = EINVAL; 3276 goto fail; 3277 } 3278 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3279 if (sav->lft_s == NULL) { 3280 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3281 error = ENOBUFS; 3282 goto fail; 3283 } 3284 /* to be initialize ? */ 3285 } 3286 } 3287 3288 return 0; 3289 3290 fail: 3291 /* initialization */ 3292 key_cleansav(sav); 3293 3294 return error; 3295 } 3296 3297 /* 3298 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3299 * OUT: 0: valid 3300 * other: errno 3301 */ 3302 static int 3303 key_mature(struct secasvar *sav) 3304 { 3305 int error; 3306 3307 /* check SPI value */ 3308 switch (sav->sah->saidx.proto) { 3309 case IPPROTO_ESP: 3310 case IPPROTO_AH: 3311 /* 3312 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3313 * 1-255 reserved by IANA for future use, 3314 * 0 for implementation specific, local use. 3315 */ 3316 if (ntohl(sav->spi) <= 255) { 3317 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3318 __func__, (u_int32_t)ntohl(sav->spi))); 3319 return EINVAL; 3320 } 3321 break; 3322 } 3323 3324 /* check satype */ 3325 switch (sav->sah->saidx.proto) { 3326 case IPPROTO_ESP: 3327 /* check flags */ 3328 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3329 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3330 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3331 "given to old-esp.\n", __func__)); 3332 return EINVAL; 3333 } 3334 error = xform_init(sav, XF_ESP); 3335 break; 3336 case IPPROTO_AH: 3337 /* check flags */ 3338 if (sav->flags & SADB_X_EXT_DERIV) { 3339 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3340 "given to AH SA.\n", __func__)); 3341 return EINVAL; 3342 } 3343 if (sav->alg_enc != SADB_EALG_NONE) { 3344 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3345 "mismated.\n", __func__)); 3346 return(EINVAL); 3347 } 3348 error = xform_init(sav, XF_AH); 3349 break; 3350 case IPPROTO_IPCOMP: 3351 if (sav->alg_auth != SADB_AALG_NONE) { 3352 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3353 "mismated.\n", __func__)); 3354 return(EINVAL); 3355 } 3356 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3357 && ntohl(sav->spi) >= 0x10000) { 3358 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3359 __func__)); 3360 return(EINVAL); 3361 } 3362 error = xform_init(sav, XF_IPCOMP); 3363 break; 3364 case IPPROTO_TCP: 3365 if (sav->alg_enc != SADB_EALG_NONE) { 3366 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3367 "mismated.\n", __func__)); 3368 return(EINVAL); 3369 } 3370 error = xform_init(sav, XF_TCPSIGNATURE); 3371 break; 3372 default: 3373 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3374 error = EPROTONOSUPPORT; 3375 break; 3376 } 3377 if (error == 0) { 3378 SAHTREE_LOCK(); 3379 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3380 SAHTREE_UNLOCK(); 3381 } 3382 return (error); 3383 } 3384 3385 /* 3386 * subroutine for SADB_GET and SADB_DUMP. 3387 */ 3388 static struct mbuf * 3389 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3390 u_int32_t seq, u_int32_t pid) 3391 { 3392 struct mbuf *result = NULL, *tres = NULL, *m; 3393 int i; 3394 int dumporder[] = { 3395 SADB_EXT_SA, SADB_X_EXT_SA2, 3396 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3397 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3398 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3399 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3400 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3401 #ifdef IPSEC_NAT_T 3402 SADB_X_EXT_NAT_T_TYPE, 3403 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3404 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3405 SADB_X_EXT_NAT_T_FRAG, 3406 #endif 3407 }; 3408 3409 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3410 if (m == NULL) 3411 goto fail; 3412 result = m; 3413 3414 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3415 m = NULL; 3416 switch (dumporder[i]) { 3417 case SADB_EXT_SA: 3418 m = key_setsadbsa(sav); 3419 if (!m) 3420 goto fail; 3421 break; 3422 3423 case SADB_X_EXT_SA2: 3424 m = key_setsadbxsa2(sav->sah->saidx.mode, 3425 sav->replay ? sav->replay->count : 0, 3426 sav->sah->saidx.reqid); 3427 if (!m) 3428 goto fail; 3429 break; 3430 3431 case SADB_EXT_ADDRESS_SRC: 3432 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3433 &sav->sah->saidx.src.sa, 3434 FULLMASK, IPSEC_ULPROTO_ANY); 3435 if (!m) 3436 goto fail; 3437 break; 3438 3439 case SADB_EXT_ADDRESS_DST: 3440 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3441 &sav->sah->saidx.dst.sa, 3442 FULLMASK, IPSEC_ULPROTO_ANY); 3443 if (!m) 3444 goto fail; 3445 break; 3446 3447 case SADB_EXT_KEY_AUTH: 3448 if (!sav->key_auth) 3449 continue; 3450 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3451 if (!m) 3452 goto fail; 3453 break; 3454 3455 case SADB_EXT_KEY_ENCRYPT: 3456 if (!sav->key_enc) 3457 continue; 3458 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3459 if (!m) 3460 goto fail; 3461 break; 3462 3463 case SADB_EXT_LIFETIME_CURRENT: 3464 if (!sav->lft_c) 3465 continue; 3466 m = key_setlifetime(sav->lft_c, 3467 SADB_EXT_LIFETIME_CURRENT); 3468 if (!m) 3469 goto fail; 3470 break; 3471 3472 case SADB_EXT_LIFETIME_HARD: 3473 if (!sav->lft_h) 3474 continue; 3475 m = key_setlifetime(sav->lft_h, 3476 SADB_EXT_LIFETIME_HARD); 3477 if (!m) 3478 goto fail; 3479 break; 3480 3481 case SADB_EXT_LIFETIME_SOFT: 3482 if (!sav->lft_s) 3483 continue; 3484 m = key_setlifetime(sav->lft_s, 3485 SADB_EXT_LIFETIME_SOFT); 3486 3487 if (!m) 3488 goto fail; 3489 break; 3490 3491 #ifdef IPSEC_NAT_T 3492 case SADB_X_EXT_NAT_T_TYPE: 3493 m = key_setsadbxtype(sav->natt_type); 3494 if (!m) 3495 goto fail; 3496 break; 3497 3498 case SADB_X_EXT_NAT_T_DPORT: 3499 m = key_setsadbxport( 3500 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3501 SADB_X_EXT_NAT_T_DPORT); 3502 if (!m) 3503 goto fail; 3504 break; 3505 3506 case SADB_X_EXT_NAT_T_SPORT: 3507 m = key_setsadbxport( 3508 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3509 SADB_X_EXT_NAT_T_SPORT); 3510 if (!m) 3511 goto fail; 3512 break; 3513 3514 case SADB_X_EXT_NAT_T_OAI: 3515 case SADB_X_EXT_NAT_T_OAR: 3516 case SADB_X_EXT_NAT_T_FRAG: 3517 /* We do not (yet) support those. */ 3518 continue; 3519 #endif 3520 3521 case SADB_EXT_ADDRESS_PROXY: 3522 case SADB_EXT_IDENTITY_SRC: 3523 case SADB_EXT_IDENTITY_DST: 3524 /* XXX: should we brought from SPD ? */ 3525 case SADB_EXT_SENSITIVITY: 3526 default: 3527 continue; 3528 } 3529 3530 if (!m) 3531 goto fail; 3532 if (tres) 3533 m_cat(m, tres); 3534 tres = m; 3535 3536 } 3537 3538 m_cat(result, tres); 3539 if (result->m_len < sizeof(struct sadb_msg)) { 3540 result = m_pullup(result, sizeof(struct sadb_msg)); 3541 if (result == NULL) 3542 goto fail; 3543 } 3544 3545 result->m_pkthdr.len = 0; 3546 for (m = result; m; m = m->m_next) 3547 result->m_pkthdr.len += m->m_len; 3548 3549 mtod(result, struct sadb_msg *)->sadb_msg_len = 3550 PFKEY_UNIT64(result->m_pkthdr.len); 3551 3552 return result; 3553 3554 fail: 3555 m_freem(result); 3556 m_freem(tres); 3557 return NULL; 3558 } 3559 3560 /* 3561 * set data into sadb_msg. 3562 */ 3563 static struct mbuf * 3564 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3565 pid_t pid, u_int16_t reserved) 3566 { 3567 struct mbuf *m; 3568 struct sadb_msg *p; 3569 int len; 3570 3571 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3572 if (len > MCLBYTES) 3573 return NULL; 3574 MGETHDR(m, M_DONTWAIT, MT_DATA); 3575 if (m && len > MHLEN) { 3576 MCLGET(m, M_DONTWAIT); 3577 if ((m->m_flags & M_EXT) == 0) { 3578 m_freem(m); 3579 m = NULL; 3580 } 3581 } 3582 if (!m) 3583 return NULL; 3584 m->m_pkthdr.len = m->m_len = len; 3585 m->m_next = NULL; 3586 3587 p = mtod(m, struct sadb_msg *); 3588 3589 bzero(p, len); 3590 p->sadb_msg_version = PF_KEY_V2; 3591 p->sadb_msg_type = type; 3592 p->sadb_msg_errno = 0; 3593 p->sadb_msg_satype = satype; 3594 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3595 p->sadb_msg_reserved = reserved; 3596 p->sadb_msg_seq = seq; 3597 p->sadb_msg_pid = (u_int32_t)pid; 3598 3599 return m; 3600 } 3601 3602 /* 3603 * copy secasvar data into sadb_address. 3604 */ 3605 static struct mbuf * 3606 key_setsadbsa(sav) 3607 struct secasvar *sav; 3608 { 3609 struct mbuf *m; 3610 struct sadb_sa *p; 3611 int len; 3612 3613 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3614 m = key_alloc_mbuf(len); 3615 if (!m || m->m_next) { /*XXX*/ 3616 if (m) 3617 m_freem(m); 3618 return NULL; 3619 } 3620 3621 p = mtod(m, struct sadb_sa *); 3622 3623 bzero(p, len); 3624 p->sadb_sa_len = PFKEY_UNIT64(len); 3625 p->sadb_sa_exttype = SADB_EXT_SA; 3626 p->sadb_sa_spi = sav->spi; 3627 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3628 p->sadb_sa_state = sav->state; 3629 p->sadb_sa_auth = sav->alg_auth; 3630 p->sadb_sa_encrypt = sav->alg_enc; 3631 p->sadb_sa_flags = sav->flags; 3632 3633 return m; 3634 } 3635 3636 /* 3637 * set data into sadb_address. 3638 */ 3639 static struct mbuf * 3640 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3641 { 3642 struct mbuf *m; 3643 struct sadb_address *p; 3644 size_t len; 3645 3646 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3647 PFKEY_ALIGN8(saddr->sa_len); 3648 m = key_alloc_mbuf(len); 3649 if (!m || m->m_next) { /*XXX*/ 3650 if (m) 3651 m_freem(m); 3652 return NULL; 3653 } 3654 3655 p = mtod(m, struct sadb_address *); 3656 3657 bzero(p, len); 3658 p->sadb_address_len = PFKEY_UNIT64(len); 3659 p->sadb_address_exttype = exttype; 3660 p->sadb_address_proto = ul_proto; 3661 if (prefixlen == FULLMASK) { 3662 switch (saddr->sa_family) { 3663 case AF_INET: 3664 prefixlen = sizeof(struct in_addr) << 3; 3665 break; 3666 case AF_INET6: 3667 prefixlen = sizeof(struct in6_addr) << 3; 3668 break; 3669 default: 3670 ; /*XXX*/ 3671 } 3672 } 3673 p->sadb_address_prefixlen = prefixlen; 3674 p->sadb_address_reserved = 0; 3675 3676 bcopy(saddr, 3677 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3678 saddr->sa_len); 3679 3680 return m; 3681 } 3682 3683 /* 3684 * set data into sadb_x_sa2. 3685 */ 3686 static struct mbuf * 3687 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3688 { 3689 struct mbuf *m; 3690 struct sadb_x_sa2 *p; 3691 size_t len; 3692 3693 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3694 m = key_alloc_mbuf(len); 3695 if (!m || m->m_next) { /*XXX*/ 3696 if (m) 3697 m_freem(m); 3698 return NULL; 3699 } 3700 3701 p = mtod(m, struct sadb_x_sa2 *); 3702 3703 bzero(p, len); 3704 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3705 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3706 p->sadb_x_sa2_mode = mode; 3707 p->sadb_x_sa2_reserved1 = 0; 3708 p->sadb_x_sa2_reserved2 = 0; 3709 p->sadb_x_sa2_sequence = seq; 3710 p->sadb_x_sa2_reqid = reqid; 3711 3712 return m; 3713 } 3714 3715 #ifdef IPSEC_NAT_T 3716 /* 3717 * Set a type in sadb_x_nat_t_type. 3718 */ 3719 static struct mbuf * 3720 key_setsadbxtype(u_int16_t type) 3721 { 3722 struct mbuf *m; 3723 size_t len; 3724 struct sadb_x_nat_t_type *p; 3725 3726 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3727 3728 m = key_alloc_mbuf(len); 3729 if (!m || m->m_next) { /*XXX*/ 3730 if (m) 3731 m_freem(m); 3732 return (NULL); 3733 } 3734 3735 p = mtod(m, struct sadb_x_nat_t_type *); 3736 3737 bzero(p, len); 3738 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3739 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3740 p->sadb_x_nat_t_type_type = type; 3741 3742 return (m); 3743 } 3744 /* 3745 * Set a port in sadb_x_nat_t_port. 3746 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3747 */ 3748 static struct mbuf * 3749 key_setsadbxport(u_int16_t port, u_int16_t type) 3750 { 3751 struct mbuf *m; 3752 size_t len; 3753 struct sadb_x_nat_t_port *p; 3754 3755 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3756 3757 m = key_alloc_mbuf(len); 3758 if (!m || m->m_next) { /*XXX*/ 3759 if (m) 3760 m_freem(m); 3761 return (NULL); 3762 } 3763 3764 p = mtod(m, struct sadb_x_nat_t_port *); 3765 3766 bzero(p, len); 3767 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3768 p->sadb_x_nat_t_port_exttype = type; 3769 p->sadb_x_nat_t_port_port = port; 3770 3771 return (m); 3772 } 3773 3774 /* 3775 * Get port from sockaddr. Port is in network byte order. 3776 */ 3777 u_int16_t 3778 key_portfromsaddr(struct sockaddr *sa) 3779 { 3780 3781 switch (sa->sa_family) { 3782 #ifdef INET 3783 case AF_INET: 3784 return ((struct sockaddr_in *)sa)->sin_port; 3785 #endif 3786 #ifdef INET6 3787 case AF_INET6: 3788 return ((struct sockaddr_in6 *)sa)->sin6_port; 3789 #endif 3790 } 3791 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3792 printf("DP %s unexpected address family %d\n", 3793 __func__, sa->sa_family)); 3794 return (0); 3795 } 3796 #endif /* IPSEC_NAT_T */ 3797 3798 /* 3799 * Set port in struct sockaddr. Port is in network byte order. 3800 */ 3801 static void 3802 key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3803 { 3804 3805 switch (sa->sa_family) { 3806 #ifdef INET 3807 case AF_INET: 3808 ((struct sockaddr_in *)sa)->sin_port = port; 3809 break; 3810 #endif 3811 #ifdef INET6 3812 case AF_INET6: 3813 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3814 break; 3815 #endif 3816 default: 3817 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3818 __func__, sa->sa_family)); 3819 break; 3820 } 3821 } 3822 3823 /* 3824 * set data into sadb_x_policy 3825 */ 3826 static struct mbuf * 3827 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3828 { 3829 struct mbuf *m; 3830 struct sadb_x_policy *p; 3831 size_t len; 3832 3833 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3834 m = key_alloc_mbuf(len); 3835 if (!m || m->m_next) { /*XXX*/ 3836 if (m) 3837 m_freem(m); 3838 return NULL; 3839 } 3840 3841 p = mtod(m, struct sadb_x_policy *); 3842 3843 bzero(p, len); 3844 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3845 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3846 p->sadb_x_policy_type = type; 3847 p->sadb_x_policy_dir = dir; 3848 p->sadb_x_policy_id = id; 3849 3850 return m; 3851 } 3852 3853 /* %%% utilities */ 3854 /* Take a key message (sadb_key) from the socket and turn it into one 3855 * of the kernel's key structures (seckey). 3856 * 3857 * IN: pointer to the src 3858 * OUT: NULL no more memory 3859 */ 3860 struct seckey * 3861 key_dup_keymsg(const struct sadb_key *src, u_int len, 3862 struct malloc_type *type) 3863 { 3864 struct seckey *dst; 3865 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3866 if (dst != NULL) { 3867 dst->bits = src->sadb_key_bits; 3868 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3869 if (dst->key_data != NULL) { 3870 bcopy((const char *)src + sizeof(struct sadb_key), 3871 dst->key_data, len); 3872 } else { 3873 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3874 __func__)); 3875 free(dst, type); 3876 dst = NULL; 3877 } 3878 } else { 3879 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3880 __func__)); 3881 3882 } 3883 return dst; 3884 } 3885 3886 /* Take a lifetime message (sadb_lifetime) passed in on a socket and 3887 * turn it into one of the kernel's lifetime structures (seclifetime). 3888 * 3889 * IN: pointer to the destination, source and malloc type 3890 * OUT: NULL, no more memory 3891 */ 3892 3893 static struct seclifetime * 3894 key_dup_lifemsg(const struct sadb_lifetime *src, 3895 struct malloc_type *type) 3896 { 3897 struct seclifetime *dst = NULL; 3898 3899 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3900 type, M_NOWAIT); 3901 if (dst == NULL) { 3902 /* XXX counter */ 3903 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3904 } else { 3905 dst->allocations = src->sadb_lifetime_allocations; 3906 dst->bytes = src->sadb_lifetime_bytes; 3907 dst->addtime = src->sadb_lifetime_addtime; 3908 dst->usetime = src->sadb_lifetime_usetime; 3909 } 3910 return dst; 3911 } 3912 3913 /* compare my own address 3914 * OUT: 1: true, i.e. my address. 3915 * 0: false 3916 */ 3917 int 3918 key_ismyaddr(sa) 3919 struct sockaddr *sa; 3920 { 3921 #ifdef INET 3922 struct sockaddr_in *sin; 3923 struct in_ifaddr *ia; 3924 #endif 3925 3926 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3927 3928 switch (sa->sa_family) { 3929 #ifdef INET 3930 case AF_INET: 3931 sin = (struct sockaddr_in *)sa; 3932 IN_IFADDR_RLOCK(); 3933 for (ia = V_in_ifaddrhead.tqh_first; ia; 3934 ia = ia->ia_link.tqe_next) 3935 { 3936 if (sin->sin_family == ia->ia_addr.sin_family && 3937 sin->sin_len == ia->ia_addr.sin_len && 3938 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3939 { 3940 IN_IFADDR_RUNLOCK(); 3941 return 1; 3942 } 3943 } 3944 IN_IFADDR_RUNLOCK(); 3945 break; 3946 #endif 3947 #ifdef INET6 3948 case AF_INET6: 3949 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3950 #endif 3951 } 3952 3953 return 0; 3954 } 3955 3956 #ifdef INET6 3957 /* 3958 * compare my own address for IPv6. 3959 * 1: ours 3960 * 0: other 3961 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3962 */ 3963 #include <netinet6/in6_var.h> 3964 3965 static int 3966 key_ismyaddr6(sin6) 3967 struct sockaddr_in6 *sin6; 3968 { 3969 struct in6_ifaddr *ia; 3970 #if 0 3971 struct in6_multi *in6m; 3972 #endif 3973 3974 IN6_IFADDR_RLOCK(); 3975 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3976 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3977 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3978 IN6_IFADDR_RUNLOCK(); 3979 return 1; 3980 } 3981 3982 #if 0 3983 /* 3984 * XXX Multicast 3985 * XXX why do we care about multlicast here while we don't care 3986 * about IPv4 multicast?? 3987 * XXX scope 3988 */ 3989 in6m = NULL; 3990 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3991 if (in6m) { 3992 IN6_IFADDR_RUNLOCK(); 3993 return 1; 3994 } 3995 #endif 3996 } 3997 IN6_IFADDR_RUNLOCK(); 3998 3999 /* loopback, just for safety */ 4000 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 4001 return 1; 4002 4003 return 0; 4004 } 4005 #endif /*INET6*/ 4006 4007 /* 4008 * compare two secasindex structure. 4009 * flag can specify to compare 2 saidxes. 4010 * compare two secasindex structure without both mode and reqid. 4011 * don't compare port. 4012 * IN: 4013 * saidx0: source, it can be in SAD. 4014 * saidx1: object. 4015 * OUT: 4016 * 1 : equal 4017 * 0 : not equal 4018 */ 4019 static int 4020 key_cmpsaidx( 4021 const struct secasindex *saidx0, 4022 const struct secasindex *saidx1, 4023 int flag) 4024 { 4025 int chkport = 0; 4026 4027 /* sanity */ 4028 if (saidx0 == NULL && saidx1 == NULL) 4029 return 1; 4030 4031 if (saidx0 == NULL || saidx1 == NULL) 4032 return 0; 4033 4034 if (saidx0->proto != saidx1->proto) 4035 return 0; 4036 4037 if (flag == CMP_EXACTLY) { 4038 if (saidx0->mode != saidx1->mode) 4039 return 0; 4040 if (saidx0->reqid != saidx1->reqid) 4041 return 0; 4042 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4043 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4044 return 0; 4045 } else { 4046 4047 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4048 if (flag == CMP_MODE_REQID 4049 ||flag == CMP_REQID) { 4050 /* 4051 * If reqid of SPD is non-zero, unique SA is required. 4052 * The result must be of same reqid in this case. 4053 */ 4054 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4055 return 0; 4056 } 4057 4058 if (flag == CMP_MODE_REQID) { 4059 if (saidx0->mode != IPSEC_MODE_ANY 4060 && saidx0->mode != saidx1->mode) 4061 return 0; 4062 } 4063 4064 #ifdef IPSEC_NAT_T 4065 /* 4066 * If NAT-T is enabled, check ports for tunnel mode. 4067 * Do not check ports if they are set to zero in the SPD. 4068 * Also do not do it for transport mode, as there is no 4069 * port information available in the SP. 4070 */ 4071 if (saidx1->mode == IPSEC_MODE_TUNNEL && 4072 saidx1->src.sa.sa_family == AF_INET && 4073 saidx1->dst.sa.sa_family == AF_INET && 4074 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 4075 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 4076 chkport = 1; 4077 #endif /* IPSEC_NAT_T */ 4078 4079 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 4080 return 0; 4081 } 4082 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 4083 return 0; 4084 } 4085 } 4086 4087 return 1; 4088 } 4089 4090 /* 4091 * compare two secindex structure exactly. 4092 * IN: 4093 * spidx0: source, it is often in SPD. 4094 * spidx1: object, it is often from PFKEY message. 4095 * OUT: 4096 * 1 : equal 4097 * 0 : not equal 4098 */ 4099 static int 4100 key_cmpspidx_exactly( 4101 struct secpolicyindex *spidx0, 4102 struct secpolicyindex *spidx1) 4103 { 4104 /* sanity */ 4105 if (spidx0 == NULL && spidx1 == NULL) 4106 return 1; 4107 4108 if (spidx0 == NULL || spidx1 == NULL) 4109 return 0; 4110 4111 if (spidx0->prefs != spidx1->prefs 4112 || spidx0->prefd != spidx1->prefd 4113 || spidx0->ul_proto != spidx1->ul_proto) 4114 return 0; 4115 4116 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4117 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4118 } 4119 4120 /* 4121 * compare two secindex structure with mask. 4122 * IN: 4123 * spidx0: source, it is often in SPD. 4124 * spidx1: object, it is often from IP header. 4125 * OUT: 4126 * 1 : equal 4127 * 0 : not equal 4128 */ 4129 static int 4130 key_cmpspidx_withmask( 4131 struct secpolicyindex *spidx0, 4132 struct secpolicyindex *spidx1) 4133 { 4134 /* sanity */ 4135 if (spidx0 == NULL && spidx1 == NULL) 4136 return 1; 4137 4138 if (spidx0 == NULL || spidx1 == NULL) 4139 return 0; 4140 4141 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4142 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4143 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4144 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4145 return 0; 4146 4147 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4148 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4149 && spidx0->ul_proto != spidx1->ul_proto) 4150 return 0; 4151 4152 switch (spidx0->src.sa.sa_family) { 4153 case AF_INET: 4154 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4155 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4156 return 0; 4157 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4158 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4159 return 0; 4160 break; 4161 case AF_INET6: 4162 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4163 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4164 return 0; 4165 /* 4166 * scope_id check. if sin6_scope_id is 0, we regard it 4167 * as a wildcard scope, which matches any scope zone ID. 4168 */ 4169 if (spidx0->src.sin6.sin6_scope_id && 4170 spidx1->src.sin6.sin6_scope_id && 4171 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4172 return 0; 4173 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4174 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4175 return 0; 4176 break; 4177 default: 4178 /* XXX */ 4179 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4180 return 0; 4181 break; 4182 } 4183 4184 switch (spidx0->dst.sa.sa_family) { 4185 case AF_INET: 4186 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4187 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4188 return 0; 4189 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4190 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4191 return 0; 4192 break; 4193 case AF_INET6: 4194 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4195 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4196 return 0; 4197 /* 4198 * scope_id check. if sin6_scope_id is 0, we regard it 4199 * as a wildcard scope, which matches any scope zone ID. 4200 */ 4201 if (spidx0->dst.sin6.sin6_scope_id && 4202 spidx1->dst.sin6.sin6_scope_id && 4203 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4204 return 0; 4205 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4206 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4207 return 0; 4208 break; 4209 default: 4210 /* XXX */ 4211 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4212 return 0; 4213 break; 4214 } 4215 4216 /* XXX Do we check other field ? e.g. flowinfo */ 4217 4218 return 1; 4219 } 4220 4221 /* returns 0 on match */ 4222 static int 4223 key_sockaddrcmp( 4224 const struct sockaddr *sa1, 4225 const struct sockaddr *sa2, 4226 int port) 4227 { 4228 #ifdef satosin 4229 #undef satosin 4230 #endif 4231 #define satosin(s) ((const struct sockaddr_in *)s) 4232 #ifdef satosin6 4233 #undef satosin6 4234 #endif 4235 #define satosin6(s) ((const struct sockaddr_in6 *)s) 4236 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4237 return 1; 4238 4239 switch (sa1->sa_family) { 4240 case AF_INET: 4241 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4242 return 1; 4243 if (satosin(sa1)->sin_addr.s_addr != 4244 satosin(sa2)->sin_addr.s_addr) { 4245 return 1; 4246 } 4247 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4248 return 1; 4249 break; 4250 case AF_INET6: 4251 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4252 return 1; /*EINVAL*/ 4253 if (satosin6(sa1)->sin6_scope_id != 4254 satosin6(sa2)->sin6_scope_id) { 4255 return 1; 4256 } 4257 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4258 &satosin6(sa2)->sin6_addr)) { 4259 return 1; 4260 } 4261 if (port && 4262 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4263 return 1; 4264 } 4265 break; 4266 default: 4267 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4268 return 1; 4269 break; 4270 } 4271 4272 return 0; 4273 #undef satosin 4274 #undef satosin6 4275 } 4276 4277 /* 4278 * compare two buffers with mask. 4279 * IN: 4280 * addr1: source 4281 * addr2: object 4282 * bits: Number of bits to compare 4283 * OUT: 4284 * 1 : equal 4285 * 0 : not equal 4286 */ 4287 static int 4288 key_bbcmp(const void *a1, const void *a2, u_int bits) 4289 { 4290 const unsigned char *p1 = a1; 4291 const unsigned char *p2 = a2; 4292 4293 /* XXX: This could be considerably faster if we compare a word 4294 * at a time, but it is complicated on LSB Endian machines */ 4295 4296 /* Handle null pointers */ 4297 if (p1 == NULL || p2 == NULL) 4298 return (p1 == p2); 4299 4300 while (bits >= 8) { 4301 if (*p1++ != *p2++) 4302 return 0; 4303 bits -= 8; 4304 } 4305 4306 if (bits > 0) { 4307 u_int8_t mask = ~((1<<(8-bits))-1); 4308 if ((*p1 & mask) != (*p2 & mask)) 4309 return 0; 4310 } 4311 return 1; /* Match! */ 4312 } 4313 4314 static void 4315 key_flush_spd(time_t now) 4316 { 4317 static u_int16_t sptree_scangen = 0; 4318 u_int16_t gen = sptree_scangen++; 4319 struct secpolicy *sp; 4320 u_int dir; 4321 4322 /* SPD */ 4323 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4324 restart: 4325 SPTREE_LOCK(); 4326 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4327 if (sp->scangen == gen) /* previously handled */ 4328 continue; 4329 sp->scangen = gen; 4330 if (sp->state == IPSEC_SPSTATE_DEAD && 4331 sp->refcnt == 1) { 4332 /* 4333 * Ensure that we only decrease refcnt once, 4334 * when we're the last consumer. 4335 * Directly call SP_DELREF/key_delsp instead 4336 * of KEY_FREESP to avoid unlocking/relocking 4337 * SPTREE_LOCK before key_delsp: may refcnt 4338 * be increased again during that time ? 4339 * NB: also clean entries created by 4340 * key_spdflush 4341 */ 4342 SP_DELREF(sp); 4343 key_delsp(sp); 4344 SPTREE_UNLOCK(); 4345 goto restart; 4346 } 4347 if (sp->lifetime == 0 && sp->validtime == 0) 4348 continue; 4349 if ((sp->lifetime && now - sp->created > sp->lifetime) 4350 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4351 sp->state = IPSEC_SPSTATE_DEAD; 4352 SPTREE_UNLOCK(); 4353 key_spdexpire(sp); 4354 goto restart; 4355 } 4356 } 4357 SPTREE_UNLOCK(); 4358 } 4359 } 4360 4361 static void 4362 key_flush_sad(time_t now) 4363 { 4364 struct secashead *sah, *nextsah; 4365 struct secasvar *sav, *nextsav; 4366 4367 /* SAD */ 4368 SAHTREE_LOCK(); 4369 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4370 /* if sah has been dead, then delete it and process next sah. */ 4371 if (sah->state == SADB_SASTATE_DEAD) { 4372 key_delsah(sah); 4373 continue; 4374 } 4375 4376 /* if LARVAL entry doesn't become MATURE, delete it. */ 4377 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4378 /* Need to also check refcnt for a larval SA ??? */ 4379 if (now - sav->created > V_key_larval_lifetime) 4380 KEY_FREESAV(&sav); 4381 } 4382 4383 /* 4384 * check MATURE entry to start to send expire message 4385 * whether or not. 4386 */ 4387 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4388 /* we don't need to check. */ 4389 if (sav->lft_s == NULL) 4390 continue; 4391 4392 /* sanity check */ 4393 if (sav->lft_c == NULL) { 4394 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4395 "time, why?\n", __func__)); 4396 continue; 4397 } 4398 4399 /* check SOFT lifetime */ 4400 if (sav->lft_s->addtime != 0 && 4401 now - sav->created > sav->lft_s->addtime) { 4402 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4403 /* 4404 * Actually, only send expire message if 4405 * SA has been used, as it was done before, 4406 * but should we always send such message, 4407 * and let IKE daemon decide if it should be 4408 * renegotiated or not ? 4409 * XXX expire message will actually NOT be 4410 * sent if SA is only used after soft 4411 * lifetime has been reached, see below 4412 * (DYING state) 4413 */ 4414 if (sav->lft_c->usetime != 0) 4415 key_expire(sav); 4416 } 4417 /* check SOFT lifetime by bytes */ 4418 /* 4419 * XXX I don't know the way to delete this SA 4420 * when new SA is installed. Caution when it's 4421 * installed too big lifetime by time. 4422 */ 4423 else if (sav->lft_s->bytes != 0 && 4424 sav->lft_s->bytes < sav->lft_c->bytes) { 4425 4426 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4427 /* 4428 * XXX If we keep to send expire 4429 * message in the status of 4430 * DYING. Do remove below code. 4431 */ 4432 key_expire(sav); 4433 } 4434 } 4435 4436 /* check DYING entry to change status to DEAD. */ 4437 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4438 /* we don't need to check. */ 4439 if (sav->lft_h == NULL) 4440 continue; 4441 4442 /* sanity check */ 4443 if (sav->lft_c == NULL) { 4444 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4445 "time, why?\n", __func__)); 4446 continue; 4447 } 4448 4449 if (sav->lft_h->addtime != 0 && 4450 now - sav->created > sav->lft_h->addtime) { 4451 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4452 KEY_FREESAV(&sav); 4453 } 4454 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4455 else if (sav->lft_s != NULL 4456 && sav->lft_s->addtime != 0 4457 && now - sav->created > sav->lft_s->addtime) { 4458 /* 4459 * XXX: should be checked to be 4460 * installed the valid SA. 4461 */ 4462 4463 /* 4464 * If there is no SA then sending 4465 * expire message. 4466 */ 4467 key_expire(sav); 4468 } 4469 #endif 4470 /* check HARD lifetime by bytes */ 4471 else if (sav->lft_h->bytes != 0 && 4472 sav->lft_h->bytes < sav->lft_c->bytes) { 4473 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4474 KEY_FREESAV(&sav); 4475 } 4476 } 4477 4478 /* delete entry in DEAD */ 4479 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4480 /* sanity check */ 4481 if (sav->state != SADB_SASTATE_DEAD) { 4482 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4483 "(queue: %d SA: %d): kill it anyway\n", 4484 __func__, 4485 SADB_SASTATE_DEAD, sav->state)); 4486 } 4487 /* 4488 * do not call key_freesav() here. 4489 * sav should already be freed, and sav->refcnt 4490 * shows other references to sav 4491 * (such as from SPD). 4492 */ 4493 } 4494 } 4495 SAHTREE_UNLOCK(); 4496 } 4497 4498 static void 4499 key_flush_acq(time_t now) 4500 { 4501 struct secacq *acq, *nextacq; 4502 4503 /* ACQ tree */ 4504 ACQ_LOCK(); 4505 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4506 nextacq = LIST_NEXT(acq, chain); 4507 if (now - acq->created > V_key_blockacq_lifetime 4508 && __LIST_CHAINED(acq)) { 4509 LIST_REMOVE(acq, chain); 4510 free(acq, M_IPSEC_SAQ); 4511 } 4512 } 4513 ACQ_UNLOCK(); 4514 } 4515 4516 static void 4517 key_flush_spacq(time_t now) 4518 { 4519 struct secspacq *acq, *nextacq; 4520 4521 /* SP ACQ tree */ 4522 SPACQ_LOCK(); 4523 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4524 nextacq = LIST_NEXT(acq, chain); 4525 if (now - acq->created > V_key_blockacq_lifetime 4526 && __LIST_CHAINED(acq)) { 4527 LIST_REMOVE(acq, chain); 4528 free(acq, M_IPSEC_SAQ); 4529 } 4530 } 4531 SPACQ_UNLOCK(); 4532 } 4533 4534 /* 4535 * time handler. 4536 * scanning SPD and SAD to check status for each entries, 4537 * and do to remove or to expire. 4538 * XXX: year 2038 problem may remain. 4539 */ 4540 void 4541 key_timehandler(void) 4542 { 4543 VNET_ITERATOR_DECL(vnet_iter); 4544 time_t now = time_second; 4545 4546 VNET_LIST_RLOCK_NOSLEEP(); 4547 VNET_FOREACH(vnet_iter) { 4548 CURVNET_SET(vnet_iter); 4549 key_flush_spd(now); 4550 key_flush_sad(now); 4551 key_flush_acq(now); 4552 key_flush_spacq(now); 4553 CURVNET_RESTORE(); 4554 } 4555 VNET_LIST_RUNLOCK_NOSLEEP(); 4556 4557 #ifndef IPSEC_DEBUG2 4558 /* do exchange to tick time !! */ 4559 (void)timeout((void *)key_timehandler, (void *)0, hz); 4560 #endif /* IPSEC_DEBUG2 */ 4561 } 4562 4563 u_long 4564 key_random() 4565 { 4566 u_long value; 4567 4568 key_randomfill(&value, sizeof(value)); 4569 return value; 4570 } 4571 4572 void 4573 key_randomfill(p, l) 4574 void *p; 4575 size_t l; 4576 { 4577 size_t n; 4578 u_long v; 4579 static int warn = 1; 4580 4581 n = 0; 4582 n = (size_t)read_random(p, (u_int)l); 4583 /* last resort */ 4584 while (n < l) { 4585 v = random(); 4586 bcopy(&v, (u_int8_t *)p + n, 4587 l - n < sizeof(v) ? l - n : sizeof(v)); 4588 n += sizeof(v); 4589 4590 if (warn) { 4591 printf("WARNING: pseudo-random number generator " 4592 "used for IPsec processing\n"); 4593 warn = 0; 4594 } 4595 } 4596 } 4597 4598 /* 4599 * map SADB_SATYPE_* to IPPROTO_*. 4600 * if satype == SADB_SATYPE then satype is mapped to ~0. 4601 * OUT: 4602 * 0: invalid satype. 4603 */ 4604 static u_int16_t 4605 key_satype2proto(u_int8_t satype) 4606 { 4607 switch (satype) { 4608 case SADB_SATYPE_UNSPEC: 4609 return IPSEC_PROTO_ANY; 4610 case SADB_SATYPE_AH: 4611 return IPPROTO_AH; 4612 case SADB_SATYPE_ESP: 4613 return IPPROTO_ESP; 4614 case SADB_X_SATYPE_IPCOMP: 4615 return IPPROTO_IPCOMP; 4616 case SADB_X_SATYPE_TCPSIGNATURE: 4617 return IPPROTO_TCP; 4618 default: 4619 return 0; 4620 } 4621 /* NOTREACHED */ 4622 } 4623 4624 /* 4625 * map IPPROTO_* to SADB_SATYPE_* 4626 * OUT: 4627 * 0: invalid protocol type. 4628 */ 4629 static u_int8_t 4630 key_proto2satype(u_int16_t proto) 4631 { 4632 switch (proto) { 4633 case IPPROTO_AH: 4634 return SADB_SATYPE_AH; 4635 case IPPROTO_ESP: 4636 return SADB_SATYPE_ESP; 4637 case IPPROTO_IPCOMP: 4638 return SADB_X_SATYPE_IPCOMP; 4639 case IPPROTO_TCP: 4640 return SADB_X_SATYPE_TCPSIGNATURE; 4641 default: 4642 return 0; 4643 } 4644 /* NOTREACHED */ 4645 } 4646 4647 /* %%% PF_KEY */ 4648 /* 4649 * SADB_GETSPI processing is to receive 4650 * <base, (SA2), src address, dst address, (SPI range)> 4651 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4652 * tree with the status of LARVAL, and send 4653 * <base, SA(*), address(SD)> 4654 * to the IKMPd. 4655 * 4656 * IN: mhp: pointer to the pointer to each header. 4657 * OUT: NULL if fail. 4658 * other if success, return pointer to the message to send. 4659 */ 4660 static int 4661 key_getspi(so, m, mhp) 4662 struct socket *so; 4663 struct mbuf *m; 4664 const struct sadb_msghdr *mhp; 4665 { 4666 struct sadb_address *src0, *dst0; 4667 struct secasindex saidx; 4668 struct secashead *newsah; 4669 struct secasvar *newsav; 4670 u_int8_t proto; 4671 u_int32_t spi; 4672 u_int8_t mode; 4673 u_int32_t reqid; 4674 int error; 4675 4676 IPSEC_ASSERT(so != NULL, ("null socket")); 4677 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4678 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4679 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4680 4681 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4682 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4683 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4684 __func__)); 4685 return key_senderror(so, m, EINVAL); 4686 } 4687 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4688 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4689 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4690 __func__)); 4691 return key_senderror(so, m, EINVAL); 4692 } 4693 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4694 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4695 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4696 } else { 4697 mode = IPSEC_MODE_ANY; 4698 reqid = 0; 4699 } 4700 4701 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4702 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4703 4704 /* map satype to proto */ 4705 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4706 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4707 __func__)); 4708 return key_senderror(so, m, EINVAL); 4709 } 4710 4711 /* 4712 * Make sure the port numbers are zero. 4713 * In case of NAT-T we will update them later if needed. 4714 */ 4715 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4716 case AF_INET: 4717 if (((struct sockaddr *)(src0 + 1))->sa_len != 4718 sizeof(struct sockaddr_in)) 4719 return key_senderror(so, m, EINVAL); 4720 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4721 break; 4722 case AF_INET6: 4723 if (((struct sockaddr *)(src0 + 1))->sa_len != 4724 sizeof(struct sockaddr_in6)) 4725 return key_senderror(so, m, EINVAL); 4726 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4727 break; 4728 default: 4729 ; /*???*/ 4730 } 4731 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4732 case AF_INET: 4733 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4734 sizeof(struct sockaddr_in)) 4735 return key_senderror(so, m, EINVAL); 4736 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4737 break; 4738 case AF_INET6: 4739 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4740 sizeof(struct sockaddr_in6)) 4741 return key_senderror(so, m, EINVAL); 4742 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4743 break; 4744 default: 4745 ; /*???*/ 4746 } 4747 4748 /* XXX boundary check against sa_len */ 4749 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4750 4751 #ifdef IPSEC_NAT_T 4752 /* 4753 * Handle NAT-T info if present. 4754 * We made sure the port numbers are zero above, so we do 4755 * not have to worry in case we do not update them. 4756 */ 4757 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4758 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4759 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4760 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4761 4762 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4763 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4764 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4765 struct sadb_x_nat_t_type *type; 4766 struct sadb_x_nat_t_port *sport, *dport; 4767 4768 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4769 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4770 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4771 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4772 "passed.\n", __func__)); 4773 return key_senderror(so, m, EINVAL); 4774 } 4775 4776 sport = (struct sadb_x_nat_t_port *) 4777 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4778 dport = (struct sadb_x_nat_t_port *) 4779 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4780 4781 if (sport) 4782 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4783 if (dport) 4784 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4785 } 4786 #endif 4787 4788 /* SPI allocation */ 4789 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4790 &saidx); 4791 if (spi == 0) 4792 return key_senderror(so, m, EINVAL); 4793 4794 /* get a SA index */ 4795 if ((newsah = key_getsah(&saidx)) == NULL) { 4796 /* create a new SA index */ 4797 if ((newsah = key_newsah(&saidx)) == NULL) { 4798 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4799 return key_senderror(so, m, ENOBUFS); 4800 } 4801 } 4802 4803 /* get a new SA */ 4804 /* XXX rewrite */ 4805 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4806 if (newsav == NULL) { 4807 /* XXX don't free new SA index allocated in above. */ 4808 return key_senderror(so, m, error); 4809 } 4810 4811 /* set spi */ 4812 newsav->spi = htonl(spi); 4813 4814 /* delete the entry in acqtree */ 4815 if (mhp->msg->sadb_msg_seq != 0) { 4816 struct secacq *acq; 4817 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4818 /* reset counter in order to deletion by timehandler. */ 4819 acq->created = time_second; 4820 acq->count = 0; 4821 } 4822 } 4823 4824 { 4825 struct mbuf *n, *nn; 4826 struct sadb_sa *m_sa; 4827 struct sadb_msg *newmsg; 4828 int off, len; 4829 4830 /* create new sadb_msg to reply. */ 4831 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4832 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4833 4834 MGETHDR(n, M_DONTWAIT, MT_DATA); 4835 if (len > MHLEN) { 4836 MCLGET(n, M_DONTWAIT); 4837 if ((n->m_flags & M_EXT) == 0) { 4838 m_freem(n); 4839 n = NULL; 4840 } 4841 } 4842 if (!n) 4843 return key_senderror(so, m, ENOBUFS); 4844 4845 n->m_len = len; 4846 n->m_next = NULL; 4847 off = 0; 4848 4849 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4850 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4851 4852 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4853 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4854 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4855 m_sa->sadb_sa_spi = htonl(spi); 4856 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4857 4858 IPSEC_ASSERT(off == len, 4859 ("length inconsistency (off %u len %u)", off, len)); 4860 4861 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4862 SADB_EXT_ADDRESS_DST); 4863 if (!n->m_next) { 4864 m_freem(n); 4865 return key_senderror(so, m, ENOBUFS); 4866 } 4867 4868 if (n->m_len < sizeof(struct sadb_msg)) { 4869 n = m_pullup(n, sizeof(struct sadb_msg)); 4870 if (n == NULL) 4871 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4872 } 4873 4874 n->m_pkthdr.len = 0; 4875 for (nn = n; nn; nn = nn->m_next) 4876 n->m_pkthdr.len += nn->m_len; 4877 4878 newmsg = mtod(n, struct sadb_msg *); 4879 newmsg->sadb_msg_seq = newsav->seq; 4880 newmsg->sadb_msg_errno = 0; 4881 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4882 4883 m_freem(m); 4884 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4885 } 4886 } 4887 4888 /* 4889 * allocating new SPI 4890 * called by key_getspi(). 4891 * OUT: 4892 * 0: failure. 4893 * others: success. 4894 */ 4895 static u_int32_t 4896 key_do_getnewspi(spirange, saidx) 4897 struct sadb_spirange *spirange; 4898 struct secasindex *saidx; 4899 { 4900 u_int32_t newspi; 4901 u_int32_t min, max; 4902 int count = V_key_spi_trycnt; 4903 4904 /* set spi range to allocate */ 4905 if (spirange != NULL) { 4906 min = spirange->sadb_spirange_min; 4907 max = spirange->sadb_spirange_max; 4908 } else { 4909 min = V_key_spi_minval; 4910 max = V_key_spi_maxval; 4911 } 4912 /* IPCOMP needs 2-byte SPI */ 4913 if (saidx->proto == IPPROTO_IPCOMP) { 4914 u_int32_t t; 4915 if (min >= 0x10000) 4916 min = 0xffff; 4917 if (max >= 0x10000) 4918 max = 0xffff; 4919 if (min > max) { 4920 t = min; min = max; max = t; 4921 } 4922 } 4923 4924 if (min == max) { 4925 if (key_checkspidup(saidx, min) != NULL) { 4926 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4927 __func__, min)); 4928 return 0; 4929 } 4930 4931 count--; /* taking one cost. */ 4932 newspi = min; 4933 4934 } else { 4935 4936 /* init SPI */ 4937 newspi = 0; 4938 4939 /* when requesting to allocate spi ranged */ 4940 while (count--) { 4941 /* generate pseudo-random SPI value ranged. */ 4942 newspi = min + (key_random() % (max - min + 1)); 4943 4944 if (key_checkspidup(saidx, newspi) == NULL) 4945 break; 4946 } 4947 4948 if (count == 0 || newspi == 0) { 4949 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4950 __func__)); 4951 return 0; 4952 } 4953 } 4954 4955 /* statistics */ 4956 keystat.getspi_count = 4957 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4958 4959 return newspi; 4960 } 4961 4962 /* 4963 * SADB_UPDATE processing 4964 * receive 4965 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4966 * key(AE), (identity(SD),) (sensitivity)> 4967 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4968 * and send 4969 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4970 * (identity(SD),) (sensitivity)> 4971 * to the ikmpd. 4972 * 4973 * m will always be freed. 4974 */ 4975 static int 4976 key_update(so, m, mhp) 4977 struct socket *so; 4978 struct mbuf *m; 4979 const struct sadb_msghdr *mhp; 4980 { 4981 struct sadb_sa *sa0; 4982 struct sadb_address *src0, *dst0; 4983 #ifdef IPSEC_NAT_T 4984 struct sadb_x_nat_t_type *type; 4985 struct sadb_x_nat_t_port *sport, *dport; 4986 struct sadb_address *iaddr, *raddr; 4987 struct sadb_x_nat_t_frag *frag; 4988 #endif 4989 struct secasindex saidx; 4990 struct secashead *sah; 4991 struct secasvar *sav; 4992 u_int16_t proto; 4993 u_int8_t mode; 4994 u_int32_t reqid; 4995 int error; 4996 4997 IPSEC_ASSERT(so != NULL, ("null socket")); 4998 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4999 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5000 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5001 5002 /* map satype to proto */ 5003 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5004 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5005 __func__)); 5006 return key_senderror(so, m, EINVAL); 5007 } 5008 5009 if (mhp->ext[SADB_EXT_SA] == NULL || 5010 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5011 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5012 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5013 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5014 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5015 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5016 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5017 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5018 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5019 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5020 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5021 __func__)); 5022 return key_senderror(so, m, EINVAL); 5023 } 5024 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5025 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5026 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5027 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5028 __func__)); 5029 return key_senderror(so, m, EINVAL); 5030 } 5031 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5032 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5033 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5034 } else { 5035 mode = IPSEC_MODE_ANY; 5036 reqid = 0; 5037 } 5038 /* XXX boundary checking for other extensions */ 5039 5040 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5041 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5042 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5043 5044 /* XXX boundary check against sa_len */ 5045 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5046 5047 /* 5048 * Make sure the port numbers are zero. 5049 * In case of NAT-T we will update them later if needed. 5050 */ 5051 KEY_PORTTOSADDR(&saidx.src, 0); 5052 KEY_PORTTOSADDR(&saidx.dst, 0); 5053 5054 #ifdef IPSEC_NAT_T 5055 /* 5056 * Handle NAT-T info if present. 5057 */ 5058 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5059 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5060 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5061 5062 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5063 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5064 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5065 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5066 __func__)); 5067 return key_senderror(so, m, EINVAL); 5068 } 5069 5070 type = (struct sadb_x_nat_t_type *) 5071 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5072 sport = (struct sadb_x_nat_t_port *) 5073 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5074 dport = (struct sadb_x_nat_t_port *) 5075 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5076 } else { 5077 type = 0; 5078 sport = dport = 0; 5079 } 5080 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5081 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5082 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5083 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5084 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5085 __func__)); 5086 return key_senderror(so, m, EINVAL); 5087 } 5088 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5089 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5090 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5091 } else { 5092 iaddr = raddr = NULL; 5093 } 5094 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5095 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5096 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5097 __func__)); 5098 return key_senderror(so, m, EINVAL); 5099 } 5100 frag = (struct sadb_x_nat_t_frag *) 5101 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5102 } else { 5103 frag = 0; 5104 } 5105 #endif 5106 5107 /* get a SA header */ 5108 if ((sah = key_getsah(&saidx)) == NULL) { 5109 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5110 return key_senderror(so, m, ENOENT); 5111 } 5112 5113 /* set spidx if there */ 5114 /* XXX rewrite */ 5115 error = key_setident(sah, m, mhp); 5116 if (error) 5117 return key_senderror(so, m, error); 5118 5119 /* find a SA with sequence number. */ 5120 #ifdef IPSEC_DOSEQCHECK 5121 if (mhp->msg->sadb_msg_seq != 0 5122 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5123 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5124 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5125 return key_senderror(so, m, ENOENT); 5126 } 5127 #else 5128 SAHTREE_LOCK(); 5129 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5130 SAHTREE_UNLOCK(); 5131 if (sav == NULL) { 5132 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5133 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5134 return key_senderror(so, m, EINVAL); 5135 } 5136 #endif 5137 5138 /* validity check */ 5139 if (sav->sah->saidx.proto != proto) { 5140 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5141 "(DB=%u param=%u)\n", __func__, 5142 sav->sah->saidx.proto, proto)); 5143 return key_senderror(so, m, EINVAL); 5144 } 5145 #ifdef IPSEC_DOSEQCHECK 5146 if (sav->spi != sa0->sadb_sa_spi) { 5147 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5148 __func__, 5149 (u_int32_t)ntohl(sav->spi), 5150 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5151 return key_senderror(so, m, EINVAL); 5152 } 5153 #endif 5154 if (sav->pid != mhp->msg->sadb_msg_pid) { 5155 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5156 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5157 return key_senderror(so, m, EINVAL); 5158 } 5159 5160 /* copy sav values */ 5161 error = key_setsaval(sav, m, mhp); 5162 if (error) { 5163 KEY_FREESAV(&sav); 5164 return key_senderror(so, m, error); 5165 } 5166 5167 #ifdef IPSEC_NAT_T 5168 /* 5169 * Handle more NAT-T info if present, 5170 * now that we have a sav to fill. 5171 */ 5172 if (type) 5173 sav->natt_type = type->sadb_x_nat_t_type_type; 5174 5175 if (sport) 5176 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5177 sport->sadb_x_nat_t_port_port); 5178 if (dport) 5179 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5180 dport->sadb_x_nat_t_port_port); 5181 5182 #if 0 5183 /* 5184 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5185 * We should actually check for a minimum MTU here, if we 5186 * want to support it in ip_output. 5187 */ 5188 if (frag) 5189 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5190 #endif 5191 #endif 5192 5193 /* check SA values to be mature. */ 5194 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5195 KEY_FREESAV(&sav); 5196 return key_senderror(so, m, 0); 5197 } 5198 5199 { 5200 struct mbuf *n; 5201 5202 /* set msg buf from mhp */ 5203 n = key_getmsgbuf_x1(m, mhp); 5204 if (n == NULL) { 5205 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5206 return key_senderror(so, m, ENOBUFS); 5207 } 5208 5209 m_freem(m); 5210 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5211 } 5212 } 5213 5214 /* 5215 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5216 * only called by key_update(). 5217 * OUT: 5218 * NULL : not found 5219 * others : found, pointer to a SA. 5220 */ 5221 #ifdef IPSEC_DOSEQCHECK 5222 static struct secasvar * 5223 key_getsavbyseq(sah, seq) 5224 struct secashead *sah; 5225 u_int32_t seq; 5226 { 5227 struct secasvar *sav; 5228 u_int state; 5229 5230 state = SADB_SASTATE_LARVAL; 5231 5232 /* search SAD with sequence number ? */ 5233 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5234 5235 KEY_CHKSASTATE(state, sav->state, __func__); 5236 5237 if (sav->seq == seq) { 5238 sa_addref(sav); 5239 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5240 printf("DP %s cause refcnt++:%d SA:%p\n", 5241 __func__, sav->refcnt, sav)); 5242 return sav; 5243 } 5244 } 5245 5246 return NULL; 5247 } 5248 #endif 5249 5250 /* 5251 * SADB_ADD processing 5252 * add an entry to SA database, when received 5253 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5254 * key(AE), (identity(SD),) (sensitivity)> 5255 * from the ikmpd, 5256 * and send 5257 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5258 * (identity(SD),) (sensitivity)> 5259 * to the ikmpd. 5260 * 5261 * IGNORE identity and sensitivity messages. 5262 * 5263 * m will always be freed. 5264 */ 5265 static int 5266 key_add(so, m, mhp) 5267 struct socket *so; 5268 struct mbuf *m; 5269 const struct sadb_msghdr *mhp; 5270 { 5271 struct sadb_sa *sa0; 5272 struct sadb_address *src0, *dst0; 5273 #ifdef IPSEC_NAT_T 5274 struct sadb_x_nat_t_type *type; 5275 struct sadb_address *iaddr, *raddr; 5276 struct sadb_x_nat_t_frag *frag; 5277 #endif 5278 struct secasindex saidx; 5279 struct secashead *newsah; 5280 struct secasvar *newsav; 5281 u_int16_t proto; 5282 u_int8_t mode; 5283 u_int32_t reqid; 5284 int error; 5285 5286 IPSEC_ASSERT(so != NULL, ("null socket")); 5287 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5288 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5289 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5290 5291 /* map satype to proto */ 5292 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5293 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5294 __func__)); 5295 return key_senderror(so, m, EINVAL); 5296 } 5297 5298 if (mhp->ext[SADB_EXT_SA] == NULL || 5299 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5300 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5301 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5302 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5303 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5304 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5305 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5306 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5307 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5308 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5309 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5310 __func__)); 5311 return key_senderror(so, m, EINVAL); 5312 } 5313 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5314 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5315 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5316 /* XXX need more */ 5317 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5318 __func__)); 5319 return key_senderror(so, m, EINVAL); 5320 } 5321 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5322 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5323 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5324 } else { 5325 mode = IPSEC_MODE_ANY; 5326 reqid = 0; 5327 } 5328 5329 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5330 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5331 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5332 5333 /* XXX boundary check against sa_len */ 5334 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5335 5336 /* 5337 * Make sure the port numbers are zero. 5338 * In case of NAT-T we will update them later if needed. 5339 */ 5340 KEY_PORTTOSADDR(&saidx.src, 0); 5341 KEY_PORTTOSADDR(&saidx.dst, 0); 5342 5343 #ifdef IPSEC_NAT_T 5344 /* 5345 * Handle NAT-T info if present. 5346 */ 5347 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5348 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5349 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5350 struct sadb_x_nat_t_port *sport, *dport; 5351 5352 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5353 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5354 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5355 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5356 __func__)); 5357 return key_senderror(so, m, EINVAL); 5358 } 5359 5360 type = (struct sadb_x_nat_t_type *) 5361 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5362 sport = (struct sadb_x_nat_t_port *) 5363 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5364 dport = (struct sadb_x_nat_t_port *) 5365 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5366 5367 if (sport) 5368 KEY_PORTTOSADDR(&saidx.src, 5369 sport->sadb_x_nat_t_port_port); 5370 if (dport) 5371 KEY_PORTTOSADDR(&saidx.dst, 5372 dport->sadb_x_nat_t_port_port); 5373 } else { 5374 type = 0; 5375 } 5376 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5377 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5378 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5379 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5380 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5381 __func__)); 5382 return key_senderror(so, m, EINVAL); 5383 } 5384 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5385 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5386 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5387 } else { 5388 iaddr = raddr = NULL; 5389 } 5390 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5391 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5392 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5393 __func__)); 5394 return key_senderror(so, m, EINVAL); 5395 } 5396 frag = (struct sadb_x_nat_t_frag *) 5397 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5398 } else { 5399 frag = 0; 5400 } 5401 #endif 5402 5403 /* get a SA header */ 5404 if ((newsah = key_getsah(&saidx)) == NULL) { 5405 /* create a new SA header */ 5406 if ((newsah = key_newsah(&saidx)) == NULL) { 5407 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5408 return key_senderror(so, m, ENOBUFS); 5409 } 5410 } 5411 5412 /* set spidx if there */ 5413 /* XXX rewrite */ 5414 error = key_setident(newsah, m, mhp); 5415 if (error) { 5416 return key_senderror(so, m, error); 5417 } 5418 5419 /* create new SA entry. */ 5420 /* We can create new SA only if SPI is differenct. */ 5421 SAHTREE_LOCK(); 5422 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5423 SAHTREE_UNLOCK(); 5424 if (newsav != NULL) { 5425 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5426 return key_senderror(so, m, EEXIST); 5427 } 5428 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5429 if (newsav == NULL) { 5430 return key_senderror(so, m, error); 5431 } 5432 5433 #ifdef IPSEC_NAT_T 5434 /* 5435 * Handle more NAT-T info if present, 5436 * now that we have a sav to fill. 5437 */ 5438 if (type) 5439 newsav->natt_type = type->sadb_x_nat_t_type_type; 5440 5441 #if 0 5442 /* 5443 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5444 * We should actually check for a minimum MTU here, if we 5445 * want to support it in ip_output. 5446 */ 5447 if (frag) 5448 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5449 #endif 5450 #endif 5451 5452 /* check SA values to be mature. */ 5453 if ((error = key_mature(newsav)) != 0) { 5454 KEY_FREESAV(&newsav); 5455 return key_senderror(so, m, error); 5456 } 5457 5458 /* 5459 * don't call key_freesav() here, as we would like to keep the SA 5460 * in the database on success. 5461 */ 5462 5463 { 5464 struct mbuf *n; 5465 5466 /* set msg buf from mhp */ 5467 n = key_getmsgbuf_x1(m, mhp); 5468 if (n == NULL) { 5469 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5470 return key_senderror(so, m, ENOBUFS); 5471 } 5472 5473 m_freem(m); 5474 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5475 } 5476 } 5477 5478 /* m is retained */ 5479 static int 5480 key_setident(sah, m, mhp) 5481 struct secashead *sah; 5482 struct mbuf *m; 5483 const struct sadb_msghdr *mhp; 5484 { 5485 const struct sadb_ident *idsrc, *iddst; 5486 int idsrclen, iddstlen; 5487 5488 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5489 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5490 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5491 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5492 5493 /* don't make buffer if not there */ 5494 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5495 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5496 sah->idents = NULL; 5497 sah->identd = NULL; 5498 return 0; 5499 } 5500 5501 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5502 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5503 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5504 return EINVAL; 5505 } 5506 5507 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5508 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5509 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5510 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5511 5512 /* validity check */ 5513 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5514 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5515 return EINVAL; 5516 } 5517 5518 switch (idsrc->sadb_ident_type) { 5519 case SADB_IDENTTYPE_PREFIX: 5520 case SADB_IDENTTYPE_FQDN: 5521 case SADB_IDENTTYPE_USERFQDN: 5522 default: 5523 /* XXX do nothing */ 5524 sah->idents = NULL; 5525 sah->identd = NULL; 5526 return 0; 5527 } 5528 5529 /* make structure */ 5530 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5531 if (sah->idents == NULL) { 5532 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5533 return ENOBUFS; 5534 } 5535 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5536 if (sah->identd == NULL) { 5537 free(sah->idents, M_IPSEC_MISC); 5538 sah->idents = NULL; 5539 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5540 return ENOBUFS; 5541 } 5542 sah->idents->type = idsrc->sadb_ident_type; 5543 sah->idents->id = idsrc->sadb_ident_id; 5544 5545 sah->identd->type = iddst->sadb_ident_type; 5546 sah->identd->id = iddst->sadb_ident_id; 5547 5548 return 0; 5549 } 5550 5551 /* 5552 * m will not be freed on return. 5553 * it is caller's responsibility to free the result. 5554 */ 5555 static struct mbuf * 5556 key_getmsgbuf_x1(m, mhp) 5557 struct mbuf *m; 5558 const struct sadb_msghdr *mhp; 5559 { 5560 struct mbuf *n; 5561 5562 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5563 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5564 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5565 5566 /* create new sadb_msg to reply. */ 5567 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5568 SADB_EXT_SA, SADB_X_EXT_SA2, 5569 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5570 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5571 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5572 if (!n) 5573 return NULL; 5574 5575 if (n->m_len < sizeof(struct sadb_msg)) { 5576 n = m_pullup(n, sizeof(struct sadb_msg)); 5577 if (n == NULL) 5578 return NULL; 5579 } 5580 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5581 mtod(n, struct sadb_msg *)->sadb_msg_len = 5582 PFKEY_UNIT64(n->m_pkthdr.len); 5583 5584 return n; 5585 } 5586 5587 static int key_delete_all __P((struct socket *, struct mbuf *, 5588 const struct sadb_msghdr *, u_int16_t)); 5589 5590 /* 5591 * SADB_DELETE processing 5592 * receive 5593 * <base, SA(*), address(SD)> 5594 * from the ikmpd, and set SADB_SASTATE_DEAD, 5595 * and send, 5596 * <base, SA(*), address(SD)> 5597 * to the ikmpd. 5598 * 5599 * m will always be freed. 5600 */ 5601 static int 5602 key_delete(so, m, mhp) 5603 struct socket *so; 5604 struct mbuf *m; 5605 const struct sadb_msghdr *mhp; 5606 { 5607 struct sadb_sa *sa0; 5608 struct sadb_address *src0, *dst0; 5609 struct secasindex saidx; 5610 struct secashead *sah; 5611 struct secasvar *sav = NULL; 5612 u_int16_t proto; 5613 5614 IPSEC_ASSERT(so != NULL, ("null socket")); 5615 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5616 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5617 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5618 5619 /* map satype to proto */ 5620 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5621 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5622 __func__)); 5623 return key_senderror(so, m, EINVAL); 5624 } 5625 5626 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5627 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5628 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5629 __func__)); 5630 return key_senderror(so, m, EINVAL); 5631 } 5632 5633 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5634 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5635 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5636 __func__)); 5637 return key_senderror(so, m, EINVAL); 5638 } 5639 5640 if (mhp->ext[SADB_EXT_SA] == NULL) { 5641 /* 5642 * Caller wants us to delete all non-LARVAL SAs 5643 * that match the src/dst. This is used during 5644 * IKE INITIAL-CONTACT. 5645 */ 5646 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5647 return key_delete_all(so, m, mhp, proto); 5648 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5649 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5650 __func__)); 5651 return key_senderror(so, m, EINVAL); 5652 } 5653 5654 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5655 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5656 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5657 5658 /* XXX boundary check against sa_len */ 5659 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5660 5661 /* 5662 * Make sure the port numbers are zero. 5663 * In case of NAT-T we will update them later if needed. 5664 */ 5665 KEY_PORTTOSADDR(&saidx.src, 0); 5666 KEY_PORTTOSADDR(&saidx.dst, 0); 5667 5668 #ifdef IPSEC_NAT_T 5669 /* 5670 * Handle NAT-T info if present. 5671 */ 5672 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5673 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5674 struct sadb_x_nat_t_port *sport, *dport; 5675 5676 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5677 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5678 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5679 __func__)); 5680 return key_senderror(so, m, EINVAL); 5681 } 5682 5683 sport = (struct sadb_x_nat_t_port *) 5684 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5685 dport = (struct sadb_x_nat_t_port *) 5686 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5687 5688 if (sport) 5689 KEY_PORTTOSADDR(&saidx.src, 5690 sport->sadb_x_nat_t_port_port); 5691 if (dport) 5692 KEY_PORTTOSADDR(&saidx.dst, 5693 dport->sadb_x_nat_t_port_port); 5694 } 5695 #endif 5696 5697 /* get a SA header */ 5698 SAHTREE_LOCK(); 5699 LIST_FOREACH(sah, &V_sahtree, chain) { 5700 if (sah->state == SADB_SASTATE_DEAD) 5701 continue; 5702 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5703 continue; 5704 5705 /* get a SA with SPI. */ 5706 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5707 if (sav) 5708 break; 5709 } 5710 if (sah == NULL) { 5711 SAHTREE_UNLOCK(); 5712 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5713 return key_senderror(so, m, ENOENT); 5714 } 5715 5716 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5717 SAHTREE_UNLOCK(); 5718 KEY_FREESAV(&sav); 5719 5720 { 5721 struct mbuf *n; 5722 struct sadb_msg *newmsg; 5723 5724 /* create new sadb_msg to reply. */ 5725 /* XXX-BZ NAT-T extensions? */ 5726 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5727 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5728 if (!n) 5729 return key_senderror(so, m, ENOBUFS); 5730 5731 if (n->m_len < sizeof(struct sadb_msg)) { 5732 n = m_pullup(n, sizeof(struct sadb_msg)); 5733 if (n == NULL) 5734 return key_senderror(so, m, ENOBUFS); 5735 } 5736 newmsg = mtod(n, struct sadb_msg *); 5737 newmsg->sadb_msg_errno = 0; 5738 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5739 5740 m_freem(m); 5741 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5742 } 5743 } 5744 5745 /* 5746 * delete all SAs for src/dst. Called from key_delete(). 5747 */ 5748 static int 5749 key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5750 u_int16_t proto) 5751 { 5752 struct sadb_address *src0, *dst0; 5753 struct secasindex saidx; 5754 struct secashead *sah; 5755 struct secasvar *sav, *nextsav; 5756 u_int stateidx, state; 5757 5758 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5759 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5760 5761 /* XXX boundary check against sa_len */ 5762 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5763 5764 /* 5765 * Make sure the port numbers are zero. 5766 * In case of NAT-T we will update them later if needed. 5767 */ 5768 KEY_PORTTOSADDR(&saidx.src, 0); 5769 KEY_PORTTOSADDR(&saidx.dst, 0); 5770 5771 #ifdef IPSEC_NAT_T 5772 /* 5773 * Handle NAT-T info if present. 5774 */ 5775 5776 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5777 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5778 struct sadb_x_nat_t_port *sport, *dport; 5779 5780 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5781 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5782 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5783 __func__)); 5784 return key_senderror(so, m, EINVAL); 5785 } 5786 5787 sport = (struct sadb_x_nat_t_port *) 5788 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5789 dport = (struct sadb_x_nat_t_port *) 5790 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5791 5792 if (sport) 5793 KEY_PORTTOSADDR(&saidx.src, 5794 sport->sadb_x_nat_t_port_port); 5795 if (dport) 5796 KEY_PORTTOSADDR(&saidx.dst, 5797 dport->sadb_x_nat_t_port_port); 5798 } 5799 #endif 5800 5801 SAHTREE_LOCK(); 5802 LIST_FOREACH(sah, &V_sahtree, chain) { 5803 if (sah->state == SADB_SASTATE_DEAD) 5804 continue; 5805 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5806 continue; 5807 5808 /* Delete all non-LARVAL SAs. */ 5809 for (stateidx = 0; 5810 stateidx < _ARRAYLEN(saorder_state_alive); 5811 stateidx++) { 5812 state = saorder_state_alive[stateidx]; 5813 if (state == SADB_SASTATE_LARVAL) 5814 continue; 5815 for (sav = LIST_FIRST(&sah->savtree[state]); 5816 sav != NULL; sav = nextsav) { 5817 nextsav = LIST_NEXT(sav, chain); 5818 /* sanity check */ 5819 if (sav->state != state) { 5820 ipseclog((LOG_DEBUG, "%s: invalid " 5821 "sav->state (queue %d SA %d)\n", 5822 __func__, state, sav->state)); 5823 continue; 5824 } 5825 5826 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5827 KEY_FREESAV(&sav); 5828 } 5829 } 5830 } 5831 SAHTREE_UNLOCK(); 5832 { 5833 struct mbuf *n; 5834 struct sadb_msg *newmsg; 5835 5836 /* create new sadb_msg to reply. */ 5837 /* XXX-BZ NAT-T extensions? */ 5838 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5839 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5840 if (!n) 5841 return key_senderror(so, m, ENOBUFS); 5842 5843 if (n->m_len < sizeof(struct sadb_msg)) { 5844 n = m_pullup(n, sizeof(struct sadb_msg)); 5845 if (n == NULL) 5846 return key_senderror(so, m, ENOBUFS); 5847 } 5848 newmsg = mtod(n, struct sadb_msg *); 5849 newmsg->sadb_msg_errno = 0; 5850 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5851 5852 m_freem(m); 5853 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5854 } 5855 } 5856 5857 /* 5858 * SADB_GET processing 5859 * receive 5860 * <base, SA(*), address(SD)> 5861 * from the ikmpd, and get a SP and a SA to respond, 5862 * and send, 5863 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5864 * (identity(SD),) (sensitivity)> 5865 * to the ikmpd. 5866 * 5867 * m will always be freed. 5868 */ 5869 static int 5870 key_get(so, m, mhp) 5871 struct socket *so; 5872 struct mbuf *m; 5873 const struct sadb_msghdr *mhp; 5874 { 5875 struct sadb_sa *sa0; 5876 struct sadb_address *src0, *dst0; 5877 struct secasindex saidx; 5878 struct secashead *sah; 5879 struct secasvar *sav = NULL; 5880 u_int16_t proto; 5881 5882 IPSEC_ASSERT(so != NULL, ("null socket")); 5883 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5884 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5885 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5886 5887 /* map satype to proto */ 5888 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5889 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5890 __func__)); 5891 return key_senderror(so, m, EINVAL); 5892 } 5893 5894 if (mhp->ext[SADB_EXT_SA] == NULL || 5895 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5896 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5897 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5898 __func__)); 5899 return key_senderror(so, m, EINVAL); 5900 } 5901 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5902 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5903 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5904 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5905 __func__)); 5906 return key_senderror(so, m, EINVAL); 5907 } 5908 5909 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5910 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5911 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5912 5913 /* XXX boundary check against sa_len */ 5914 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5915 5916 /* 5917 * Make sure the port numbers are zero. 5918 * In case of NAT-T we will update them later if needed. 5919 */ 5920 KEY_PORTTOSADDR(&saidx.src, 0); 5921 KEY_PORTTOSADDR(&saidx.dst, 0); 5922 5923 #ifdef IPSEC_NAT_T 5924 /* 5925 * Handle NAT-T info if present. 5926 */ 5927 5928 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5929 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5930 struct sadb_x_nat_t_port *sport, *dport; 5931 5932 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5933 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5934 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5935 __func__)); 5936 return key_senderror(so, m, EINVAL); 5937 } 5938 5939 sport = (struct sadb_x_nat_t_port *) 5940 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5941 dport = (struct sadb_x_nat_t_port *) 5942 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5943 5944 if (sport) 5945 KEY_PORTTOSADDR(&saidx.src, 5946 sport->sadb_x_nat_t_port_port); 5947 if (dport) 5948 KEY_PORTTOSADDR(&saidx.dst, 5949 dport->sadb_x_nat_t_port_port); 5950 } 5951 #endif 5952 5953 /* get a SA header */ 5954 SAHTREE_LOCK(); 5955 LIST_FOREACH(sah, &V_sahtree, chain) { 5956 if (sah->state == SADB_SASTATE_DEAD) 5957 continue; 5958 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5959 continue; 5960 5961 /* get a SA with SPI. */ 5962 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5963 if (sav) 5964 break; 5965 } 5966 SAHTREE_UNLOCK(); 5967 if (sah == NULL) { 5968 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5969 return key_senderror(so, m, ENOENT); 5970 } 5971 5972 { 5973 struct mbuf *n; 5974 u_int8_t satype; 5975 5976 /* map proto to satype */ 5977 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5978 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5979 __func__)); 5980 return key_senderror(so, m, EINVAL); 5981 } 5982 5983 /* create new sadb_msg to reply. */ 5984 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5985 mhp->msg->sadb_msg_pid); 5986 if (!n) 5987 return key_senderror(so, m, ENOBUFS); 5988 5989 m_freem(m); 5990 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5991 } 5992 } 5993 5994 /* XXX make it sysctl-configurable? */ 5995 static void 5996 key_getcomb_setlifetime(comb) 5997 struct sadb_comb *comb; 5998 { 5999 6000 comb->sadb_comb_soft_allocations = 1; 6001 comb->sadb_comb_hard_allocations = 1; 6002 comb->sadb_comb_soft_bytes = 0; 6003 comb->sadb_comb_hard_bytes = 0; 6004 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 6005 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 6006 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 6007 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 6008 } 6009 6010 /* 6011 * XXX reorder combinations by preference 6012 * XXX no idea if the user wants ESP authentication or not 6013 */ 6014 static struct mbuf * 6015 key_getcomb_esp() 6016 { 6017 struct sadb_comb *comb; 6018 struct enc_xform *algo; 6019 struct mbuf *result = NULL, *m, *n; 6020 int encmin; 6021 int i, off, o; 6022 int totlen; 6023 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6024 6025 m = NULL; 6026 for (i = 1; i <= SADB_EALG_MAX; i++) { 6027 algo = esp_algorithm_lookup(i); 6028 if (algo == NULL) 6029 continue; 6030 6031 /* discard algorithms with key size smaller than system min */ 6032 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 6033 continue; 6034 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 6035 encmin = V_ipsec_esp_keymin; 6036 else 6037 encmin = _BITS(algo->minkey); 6038 6039 if (V_ipsec_esp_auth) 6040 m = key_getcomb_ah(); 6041 else { 6042 IPSEC_ASSERT(l <= MLEN, 6043 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6044 MGET(m, M_DONTWAIT, MT_DATA); 6045 if (m) { 6046 M_ALIGN(m, l); 6047 m->m_len = l; 6048 m->m_next = NULL; 6049 bzero(mtod(m, caddr_t), m->m_len); 6050 } 6051 } 6052 if (!m) 6053 goto fail; 6054 6055 totlen = 0; 6056 for (n = m; n; n = n->m_next) 6057 totlen += n->m_len; 6058 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 6059 6060 for (off = 0; off < totlen; off += l) { 6061 n = m_pulldown(m, off, l, &o); 6062 if (!n) { 6063 /* m is already freed */ 6064 goto fail; 6065 } 6066 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 6067 bzero(comb, sizeof(*comb)); 6068 key_getcomb_setlifetime(comb); 6069 comb->sadb_comb_encrypt = i; 6070 comb->sadb_comb_encrypt_minbits = encmin; 6071 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 6072 } 6073 6074 if (!result) 6075 result = m; 6076 else 6077 m_cat(result, m); 6078 } 6079 6080 return result; 6081 6082 fail: 6083 if (result) 6084 m_freem(result); 6085 return NULL; 6086 } 6087 6088 static void 6089 key_getsizes_ah( 6090 const struct auth_hash *ah, 6091 int alg, 6092 u_int16_t* min, 6093 u_int16_t* max) 6094 { 6095 6096 *min = *max = ah->keysize; 6097 if (ah->keysize == 0) { 6098 /* 6099 * Transform takes arbitrary key size but algorithm 6100 * key size is restricted. Enforce this here. 6101 */ 6102 switch (alg) { 6103 case SADB_X_AALG_MD5: *min = *max = 16; break; 6104 case SADB_X_AALG_SHA: *min = *max = 20; break; 6105 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 6106 default: 6107 DPRINTF(("%s: unknown AH algorithm %u\n", 6108 __func__, alg)); 6109 break; 6110 } 6111 } 6112 } 6113 6114 /* 6115 * XXX reorder combinations by preference 6116 */ 6117 static struct mbuf * 6118 key_getcomb_ah() 6119 { 6120 struct sadb_comb *comb; 6121 struct auth_hash *algo; 6122 struct mbuf *m; 6123 u_int16_t minkeysize, maxkeysize; 6124 int i; 6125 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6126 6127 m = NULL; 6128 for (i = 1; i <= SADB_AALG_MAX; i++) { 6129 #if 1 6130 /* we prefer HMAC algorithms, not old algorithms */ 6131 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 6132 continue; 6133 #endif 6134 algo = ah_algorithm_lookup(i); 6135 if (!algo) 6136 continue; 6137 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6138 /* discard algorithms with key size smaller than system min */ 6139 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6140 continue; 6141 6142 if (!m) { 6143 IPSEC_ASSERT(l <= MLEN, 6144 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6145 MGET(m, M_DONTWAIT, MT_DATA); 6146 if (m) { 6147 M_ALIGN(m, l); 6148 m->m_len = l; 6149 m->m_next = NULL; 6150 } 6151 } else 6152 M_PREPEND(m, l, M_DONTWAIT); 6153 if (!m) 6154 return NULL; 6155 6156 comb = mtod(m, struct sadb_comb *); 6157 bzero(comb, sizeof(*comb)); 6158 key_getcomb_setlifetime(comb); 6159 comb->sadb_comb_auth = i; 6160 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6161 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6162 } 6163 6164 return m; 6165 } 6166 6167 /* 6168 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6169 * XXX reorder combinations by preference 6170 */ 6171 static struct mbuf * 6172 key_getcomb_ipcomp() 6173 { 6174 struct sadb_comb *comb; 6175 struct comp_algo *algo; 6176 struct mbuf *m; 6177 int i; 6178 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6179 6180 m = NULL; 6181 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6182 algo = ipcomp_algorithm_lookup(i); 6183 if (!algo) 6184 continue; 6185 6186 if (!m) { 6187 IPSEC_ASSERT(l <= MLEN, 6188 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6189 MGET(m, M_DONTWAIT, MT_DATA); 6190 if (m) { 6191 M_ALIGN(m, l); 6192 m->m_len = l; 6193 m->m_next = NULL; 6194 } 6195 } else 6196 M_PREPEND(m, l, M_DONTWAIT); 6197 if (!m) 6198 return NULL; 6199 6200 comb = mtod(m, struct sadb_comb *); 6201 bzero(comb, sizeof(*comb)); 6202 key_getcomb_setlifetime(comb); 6203 comb->sadb_comb_encrypt = i; 6204 /* what should we set into sadb_comb_*_{min,max}bits? */ 6205 } 6206 6207 return m; 6208 } 6209 6210 /* 6211 * XXX no way to pass mode (transport/tunnel) to userland 6212 * XXX replay checking? 6213 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6214 */ 6215 static struct mbuf * 6216 key_getprop(saidx) 6217 const struct secasindex *saidx; 6218 { 6219 struct sadb_prop *prop; 6220 struct mbuf *m, *n; 6221 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6222 int totlen; 6223 6224 switch (saidx->proto) { 6225 case IPPROTO_ESP: 6226 m = key_getcomb_esp(); 6227 break; 6228 case IPPROTO_AH: 6229 m = key_getcomb_ah(); 6230 break; 6231 case IPPROTO_IPCOMP: 6232 m = key_getcomb_ipcomp(); 6233 break; 6234 default: 6235 return NULL; 6236 } 6237 6238 if (!m) 6239 return NULL; 6240 M_PREPEND(m, l, M_DONTWAIT); 6241 if (!m) 6242 return NULL; 6243 6244 totlen = 0; 6245 for (n = m; n; n = n->m_next) 6246 totlen += n->m_len; 6247 6248 prop = mtod(m, struct sadb_prop *); 6249 bzero(prop, sizeof(*prop)); 6250 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6251 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6252 prop->sadb_prop_replay = 32; /* XXX */ 6253 6254 return m; 6255 } 6256 6257 /* 6258 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6259 * send 6260 * <base, SA, address(SD), (address(P)), x_policy, 6261 * (identity(SD),) (sensitivity,) proposal> 6262 * to KMD, and expect to receive 6263 * <base> with SADB_ACQUIRE if error occured, 6264 * or 6265 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6266 * from KMD by PF_KEY. 6267 * 6268 * XXX x_policy is outside of RFC2367 (KAME extension). 6269 * XXX sensitivity is not supported. 6270 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6271 * see comment for key_getcomb_ipcomp(). 6272 * 6273 * OUT: 6274 * 0 : succeed 6275 * others: error number 6276 */ 6277 static int 6278 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6279 { 6280 struct mbuf *result = NULL, *m; 6281 struct secacq *newacq; 6282 u_int8_t satype; 6283 int error = -1; 6284 u_int32_t seq; 6285 6286 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6287 satype = key_proto2satype(saidx->proto); 6288 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6289 6290 /* 6291 * We never do anything about acquirng SA. There is anather 6292 * solution that kernel blocks to send SADB_ACQUIRE message until 6293 * getting something message from IKEd. In later case, to be 6294 * managed with ACQUIRING list. 6295 */ 6296 /* Get an entry to check whether sending message or not. */ 6297 if ((newacq = key_getacq(saidx)) != NULL) { 6298 if (V_key_blockacq_count < newacq->count) { 6299 /* reset counter and do send message. */ 6300 newacq->count = 0; 6301 } else { 6302 /* increment counter and do nothing. */ 6303 newacq->count++; 6304 return 0; 6305 } 6306 } else { 6307 /* make new entry for blocking to send SADB_ACQUIRE. */ 6308 if ((newacq = key_newacq(saidx)) == NULL) 6309 return ENOBUFS; 6310 } 6311 6312 6313 seq = newacq->seq; 6314 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6315 if (!m) { 6316 error = ENOBUFS; 6317 goto fail; 6318 } 6319 result = m; 6320 6321 /* 6322 * No SADB_X_EXT_NAT_T_* here: we do not know 6323 * anything related to NAT-T at this time. 6324 */ 6325 6326 /* set sadb_address for saidx's. */ 6327 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6328 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6329 if (!m) { 6330 error = ENOBUFS; 6331 goto fail; 6332 } 6333 m_cat(result, m); 6334 6335 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6336 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6337 if (!m) { 6338 error = ENOBUFS; 6339 goto fail; 6340 } 6341 m_cat(result, m); 6342 6343 /* XXX proxy address (optional) */ 6344 6345 /* set sadb_x_policy */ 6346 if (sp) { 6347 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6348 if (!m) { 6349 error = ENOBUFS; 6350 goto fail; 6351 } 6352 m_cat(result, m); 6353 } 6354 6355 /* XXX identity (optional) */ 6356 #if 0 6357 if (idexttype && fqdn) { 6358 /* create identity extension (FQDN) */ 6359 struct sadb_ident *id; 6360 int fqdnlen; 6361 6362 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6363 id = (struct sadb_ident *)p; 6364 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6365 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6366 id->sadb_ident_exttype = idexttype; 6367 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6368 bcopy(fqdn, id + 1, fqdnlen); 6369 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6370 } 6371 6372 if (idexttype) { 6373 /* create identity extension (USERFQDN) */ 6374 struct sadb_ident *id; 6375 int userfqdnlen; 6376 6377 if (userfqdn) { 6378 /* +1 for terminating-NUL */ 6379 userfqdnlen = strlen(userfqdn) + 1; 6380 } else 6381 userfqdnlen = 0; 6382 id = (struct sadb_ident *)p; 6383 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6384 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6385 id->sadb_ident_exttype = idexttype; 6386 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6387 /* XXX is it correct? */ 6388 if (curproc && curproc->p_cred) 6389 id->sadb_ident_id = curproc->p_cred->p_ruid; 6390 if (userfqdn && userfqdnlen) 6391 bcopy(userfqdn, id + 1, userfqdnlen); 6392 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6393 } 6394 #endif 6395 6396 /* XXX sensitivity (optional) */ 6397 6398 /* create proposal/combination extension */ 6399 m = key_getprop(saidx); 6400 #if 0 6401 /* 6402 * spec conformant: always attach proposal/combination extension, 6403 * the problem is that we have no way to attach it for ipcomp, 6404 * due to the way sadb_comb is declared in RFC2367. 6405 */ 6406 if (!m) { 6407 error = ENOBUFS; 6408 goto fail; 6409 } 6410 m_cat(result, m); 6411 #else 6412 /* 6413 * outside of spec; make proposal/combination extension optional. 6414 */ 6415 if (m) 6416 m_cat(result, m); 6417 #endif 6418 6419 if ((result->m_flags & M_PKTHDR) == 0) { 6420 error = EINVAL; 6421 goto fail; 6422 } 6423 6424 if (result->m_len < sizeof(struct sadb_msg)) { 6425 result = m_pullup(result, sizeof(struct sadb_msg)); 6426 if (result == NULL) { 6427 error = ENOBUFS; 6428 goto fail; 6429 } 6430 } 6431 6432 result->m_pkthdr.len = 0; 6433 for (m = result; m; m = m->m_next) 6434 result->m_pkthdr.len += m->m_len; 6435 6436 mtod(result, struct sadb_msg *)->sadb_msg_len = 6437 PFKEY_UNIT64(result->m_pkthdr.len); 6438 6439 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6440 6441 fail: 6442 if (result) 6443 m_freem(result); 6444 return error; 6445 } 6446 6447 static struct secacq * 6448 key_newacq(const struct secasindex *saidx) 6449 { 6450 struct secacq *newacq; 6451 6452 /* get new entry */ 6453 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6454 if (newacq == NULL) { 6455 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6456 return NULL; 6457 } 6458 6459 /* copy secindex */ 6460 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6461 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6462 newacq->created = time_second; 6463 newacq->count = 0; 6464 6465 /* add to acqtree */ 6466 ACQ_LOCK(); 6467 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6468 ACQ_UNLOCK(); 6469 6470 return newacq; 6471 } 6472 6473 static struct secacq * 6474 key_getacq(const struct secasindex *saidx) 6475 { 6476 struct secacq *acq; 6477 6478 ACQ_LOCK(); 6479 LIST_FOREACH(acq, &V_acqtree, chain) { 6480 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6481 break; 6482 } 6483 ACQ_UNLOCK(); 6484 6485 return acq; 6486 } 6487 6488 static struct secacq * 6489 key_getacqbyseq(seq) 6490 u_int32_t seq; 6491 { 6492 struct secacq *acq; 6493 6494 ACQ_LOCK(); 6495 LIST_FOREACH(acq, &V_acqtree, chain) { 6496 if (acq->seq == seq) 6497 break; 6498 } 6499 ACQ_UNLOCK(); 6500 6501 return acq; 6502 } 6503 6504 static struct secspacq * 6505 key_newspacq(spidx) 6506 struct secpolicyindex *spidx; 6507 { 6508 struct secspacq *acq; 6509 6510 /* get new entry */ 6511 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6512 if (acq == NULL) { 6513 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6514 return NULL; 6515 } 6516 6517 /* copy secindex */ 6518 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6519 acq->created = time_second; 6520 acq->count = 0; 6521 6522 /* add to spacqtree */ 6523 SPACQ_LOCK(); 6524 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6525 SPACQ_UNLOCK(); 6526 6527 return acq; 6528 } 6529 6530 static struct secspacq * 6531 key_getspacq(spidx) 6532 struct secpolicyindex *spidx; 6533 { 6534 struct secspacq *acq; 6535 6536 SPACQ_LOCK(); 6537 LIST_FOREACH(acq, &V_spacqtree, chain) { 6538 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6539 /* NB: return holding spacq_lock */ 6540 return acq; 6541 } 6542 } 6543 SPACQ_UNLOCK(); 6544 6545 return NULL; 6546 } 6547 6548 /* 6549 * SADB_ACQUIRE processing, 6550 * in first situation, is receiving 6551 * <base> 6552 * from the ikmpd, and clear sequence of its secasvar entry. 6553 * 6554 * In second situation, is receiving 6555 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6556 * from a user land process, and return 6557 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6558 * to the socket. 6559 * 6560 * m will always be freed. 6561 */ 6562 static int 6563 key_acquire2(so, m, mhp) 6564 struct socket *so; 6565 struct mbuf *m; 6566 const struct sadb_msghdr *mhp; 6567 { 6568 const struct sadb_address *src0, *dst0; 6569 struct secasindex saidx; 6570 struct secashead *sah; 6571 u_int16_t proto; 6572 int error; 6573 6574 IPSEC_ASSERT(so != NULL, ("null socket")); 6575 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6576 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6577 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6578 6579 /* 6580 * Error message from KMd. 6581 * We assume that if error was occured in IKEd, the length of PFKEY 6582 * message is equal to the size of sadb_msg structure. 6583 * We do not raise error even if error occured in this function. 6584 */ 6585 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6586 struct secacq *acq; 6587 6588 /* check sequence number */ 6589 if (mhp->msg->sadb_msg_seq == 0) { 6590 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6591 "number.\n", __func__)); 6592 m_freem(m); 6593 return 0; 6594 } 6595 6596 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6597 /* 6598 * the specified larval SA is already gone, or we got 6599 * a bogus sequence number. we can silently ignore it. 6600 */ 6601 m_freem(m); 6602 return 0; 6603 } 6604 6605 /* reset acq counter in order to deletion by timehander. */ 6606 acq->created = time_second; 6607 acq->count = 0; 6608 m_freem(m); 6609 return 0; 6610 } 6611 6612 /* 6613 * This message is from user land. 6614 */ 6615 6616 /* map satype to proto */ 6617 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6618 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6619 __func__)); 6620 return key_senderror(so, m, EINVAL); 6621 } 6622 6623 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6624 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6625 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6626 /* error */ 6627 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6628 __func__)); 6629 return key_senderror(so, m, EINVAL); 6630 } 6631 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6632 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6633 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6634 /* error */ 6635 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6636 __func__)); 6637 return key_senderror(so, m, EINVAL); 6638 } 6639 6640 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6641 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6642 6643 /* XXX boundary check against sa_len */ 6644 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6645 6646 /* 6647 * Make sure the port numbers are zero. 6648 * In case of NAT-T we will update them later if needed. 6649 */ 6650 KEY_PORTTOSADDR(&saidx.src, 0); 6651 KEY_PORTTOSADDR(&saidx.dst, 0); 6652 6653 #ifndef IPSEC_NAT_T 6654 /* 6655 * Handle NAT-T info if present. 6656 */ 6657 6658 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6659 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6660 struct sadb_x_nat_t_port *sport, *dport; 6661 6662 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6663 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6664 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6665 __func__)); 6666 return key_senderror(so, m, EINVAL); 6667 } 6668 6669 sport = (struct sadb_x_nat_t_port *) 6670 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6671 dport = (struct sadb_x_nat_t_port *) 6672 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6673 6674 if (sport) 6675 KEY_PORTTOSADDR(&saidx.src, 6676 sport->sadb_x_nat_t_port_port); 6677 if (dport) 6678 KEY_PORTTOSADDR(&saidx.dst, 6679 dport->sadb_x_nat_t_port_port); 6680 } 6681 #endif 6682 6683 /* get a SA index */ 6684 SAHTREE_LOCK(); 6685 LIST_FOREACH(sah, &V_sahtree, chain) { 6686 if (sah->state == SADB_SASTATE_DEAD) 6687 continue; 6688 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6689 break; 6690 } 6691 SAHTREE_UNLOCK(); 6692 if (sah != NULL) { 6693 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6694 return key_senderror(so, m, EEXIST); 6695 } 6696 6697 error = key_acquire(&saidx, NULL); 6698 if (error != 0) { 6699 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6700 __func__, mhp->msg->sadb_msg_errno)); 6701 return key_senderror(so, m, error); 6702 } 6703 6704 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6705 } 6706 6707 /* 6708 * SADB_REGISTER processing. 6709 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6710 * receive 6711 * <base> 6712 * from the ikmpd, and register a socket to send PF_KEY messages, 6713 * and send 6714 * <base, supported> 6715 * to KMD by PF_KEY. 6716 * If socket is detached, must free from regnode. 6717 * 6718 * m will always be freed. 6719 */ 6720 static int 6721 key_register(so, m, mhp) 6722 struct socket *so; 6723 struct mbuf *m; 6724 const struct sadb_msghdr *mhp; 6725 { 6726 struct secreg *reg, *newreg = 0; 6727 6728 IPSEC_ASSERT(so != NULL, ("null socket")); 6729 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6730 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6731 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6732 6733 /* check for invalid register message */ 6734 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6735 return key_senderror(so, m, EINVAL); 6736 6737 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6738 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6739 goto setmsg; 6740 6741 /* check whether existing or not */ 6742 REGTREE_LOCK(); 6743 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6744 if (reg->so == so) { 6745 REGTREE_UNLOCK(); 6746 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6747 __func__)); 6748 return key_senderror(so, m, EEXIST); 6749 } 6750 } 6751 6752 /* create regnode */ 6753 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6754 if (newreg == NULL) { 6755 REGTREE_UNLOCK(); 6756 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6757 return key_senderror(so, m, ENOBUFS); 6758 } 6759 6760 newreg->so = so; 6761 ((struct keycb *)sotorawcb(so))->kp_registered++; 6762 6763 /* add regnode to regtree. */ 6764 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6765 REGTREE_UNLOCK(); 6766 6767 setmsg: 6768 { 6769 struct mbuf *n; 6770 struct sadb_msg *newmsg; 6771 struct sadb_supported *sup; 6772 u_int len, alen, elen; 6773 int off; 6774 int i; 6775 struct sadb_alg *alg; 6776 6777 /* create new sadb_msg to reply. */ 6778 alen = 0; 6779 for (i = 1; i <= SADB_AALG_MAX; i++) { 6780 if (ah_algorithm_lookup(i)) 6781 alen += sizeof(struct sadb_alg); 6782 } 6783 if (alen) 6784 alen += sizeof(struct sadb_supported); 6785 elen = 0; 6786 for (i = 1; i <= SADB_EALG_MAX; i++) { 6787 if (esp_algorithm_lookup(i)) 6788 elen += sizeof(struct sadb_alg); 6789 } 6790 if (elen) 6791 elen += sizeof(struct sadb_supported); 6792 6793 len = sizeof(struct sadb_msg) + alen + elen; 6794 6795 if (len > MCLBYTES) 6796 return key_senderror(so, m, ENOBUFS); 6797 6798 MGETHDR(n, M_DONTWAIT, MT_DATA); 6799 if (len > MHLEN) { 6800 MCLGET(n, M_DONTWAIT); 6801 if ((n->m_flags & M_EXT) == 0) { 6802 m_freem(n); 6803 n = NULL; 6804 } 6805 } 6806 if (!n) 6807 return key_senderror(so, m, ENOBUFS); 6808 6809 n->m_pkthdr.len = n->m_len = len; 6810 n->m_next = NULL; 6811 off = 0; 6812 6813 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6814 newmsg = mtod(n, struct sadb_msg *); 6815 newmsg->sadb_msg_errno = 0; 6816 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6817 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6818 6819 /* for authentication algorithm */ 6820 if (alen) { 6821 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6822 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6823 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6824 off += PFKEY_ALIGN8(sizeof(*sup)); 6825 6826 for (i = 1; i <= SADB_AALG_MAX; i++) { 6827 struct auth_hash *aalgo; 6828 u_int16_t minkeysize, maxkeysize; 6829 6830 aalgo = ah_algorithm_lookup(i); 6831 if (!aalgo) 6832 continue; 6833 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6834 alg->sadb_alg_id = i; 6835 alg->sadb_alg_ivlen = 0; 6836 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6837 alg->sadb_alg_minbits = _BITS(minkeysize); 6838 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6839 off += PFKEY_ALIGN8(sizeof(*alg)); 6840 } 6841 } 6842 6843 /* for encryption algorithm */ 6844 if (elen) { 6845 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6846 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6847 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6848 off += PFKEY_ALIGN8(sizeof(*sup)); 6849 6850 for (i = 1; i <= SADB_EALG_MAX; i++) { 6851 struct enc_xform *ealgo; 6852 6853 ealgo = esp_algorithm_lookup(i); 6854 if (!ealgo) 6855 continue; 6856 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6857 alg->sadb_alg_id = i; 6858 alg->sadb_alg_ivlen = ealgo->blocksize; 6859 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6860 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6861 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6862 } 6863 } 6864 6865 IPSEC_ASSERT(off == len, 6866 ("length assumption failed (off %u len %u)", off, len)); 6867 6868 m_freem(m); 6869 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6870 } 6871 } 6872 6873 /* 6874 * free secreg entry registered. 6875 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6876 */ 6877 void 6878 key_freereg(struct socket *so) 6879 { 6880 struct secreg *reg; 6881 int i; 6882 6883 IPSEC_ASSERT(so != NULL, ("NULL so")); 6884 6885 /* 6886 * check whether existing or not. 6887 * check all type of SA, because there is a potential that 6888 * one socket is registered to multiple type of SA. 6889 */ 6890 REGTREE_LOCK(); 6891 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6892 LIST_FOREACH(reg, &V_regtree[i], chain) { 6893 if (reg->so == so && __LIST_CHAINED(reg)) { 6894 LIST_REMOVE(reg, chain); 6895 free(reg, M_IPSEC_SAR); 6896 break; 6897 } 6898 } 6899 } 6900 REGTREE_UNLOCK(); 6901 } 6902 6903 /* 6904 * SADB_EXPIRE processing 6905 * send 6906 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6907 * to KMD by PF_KEY. 6908 * NOTE: We send only soft lifetime extension. 6909 * 6910 * OUT: 0 : succeed 6911 * others : error number 6912 */ 6913 static int 6914 key_expire(struct secasvar *sav) 6915 { 6916 int s; 6917 int satype; 6918 struct mbuf *result = NULL, *m; 6919 int len; 6920 int error = -1; 6921 struct sadb_lifetime *lt; 6922 6923 /* XXX: Why do we lock ? */ 6924 s = splnet(); /*called from softclock()*/ 6925 6926 IPSEC_ASSERT (sav != NULL, ("null sav")); 6927 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6928 6929 /* set msg header */ 6930 satype = key_proto2satype(sav->sah->saidx.proto); 6931 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6932 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6933 if (!m) { 6934 error = ENOBUFS; 6935 goto fail; 6936 } 6937 result = m; 6938 6939 /* create SA extension */ 6940 m = key_setsadbsa(sav); 6941 if (!m) { 6942 error = ENOBUFS; 6943 goto fail; 6944 } 6945 m_cat(result, m); 6946 6947 /* create SA extension */ 6948 m = key_setsadbxsa2(sav->sah->saidx.mode, 6949 sav->replay ? sav->replay->count : 0, 6950 sav->sah->saidx.reqid); 6951 if (!m) { 6952 error = ENOBUFS; 6953 goto fail; 6954 } 6955 m_cat(result, m); 6956 6957 /* create lifetime extension (current and soft) */ 6958 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6959 m = key_alloc_mbuf(len); 6960 if (!m || m->m_next) { /*XXX*/ 6961 if (m) 6962 m_freem(m); 6963 error = ENOBUFS; 6964 goto fail; 6965 } 6966 bzero(mtod(m, caddr_t), len); 6967 lt = mtod(m, struct sadb_lifetime *); 6968 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6969 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6970 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6971 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6972 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6973 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6974 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6975 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6976 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6977 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6978 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6979 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6980 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6981 m_cat(result, m); 6982 6983 /* set sadb_address for source */ 6984 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6985 &sav->sah->saidx.src.sa, 6986 FULLMASK, IPSEC_ULPROTO_ANY); 6987 if (!m) { 6988 error = ENOBUFS; 6989 goto fail; 6990 } 6991 m_cat(result, m); 6992 6993 /* set sadb_address for destination */ 6994 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6995 &sav->sah->saidx.dst.sa, 6996 FULLMASK, IPSEC_ULPROTO_ANY); 6997 if (!m) { 6998 error = ENOBUFS; 6999 goto fail; 7000 } 7001 m_cat(result, m); 7002 7003 /* 7004 * XXX-BZ Handle NAT-T extensions here. 7005 */ 7006 7007 if ((result->m_flags & M_PKTHDR) == 0) { 7008 error = EINVAL; 7009 goto fail; 7010 } 7011 7012 if (result->m_len < sizeof(struct sadb_msg)) { 7013 result = m_pullup(result, sizeof(struct sadb_msg)); 7014 if (result == NULL) { 7015 error = ENOBUFS; 7016 goto fail; 7017 } 7018 } 7019 7020 result->m_pkthdr.len = 0; 7021 for (m = result; m; m = m->m_next) 7022 result->m_pkthdr.len += m->m_len; 7023 7024 mtod(result, struct sadb_msg *)->sadb_msg_len = 7025 PFKEY_UNIT64(result->m_pkthdr.len); 7026 7027 splx(s); 7028 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 7029 7030 fail: 7031 if (result) 7032 m_freem(result); 7033 splx(s); 7034 return error; 7035 } 7036 7037 /* 7038 * SADB_FLUSH processing 7039 * receive 7040 * <base> 7041 * from the ikmpd, and free all entries in secastree. 7042 * and send, 7043 * <base> 7044 * to the ikmpd. 7045 * NOTE: to do is only marking SADB_SASTATE_DEAD. 7046 * 7047 * m will always be freed. 7048 */ 7049 static int 7050 key_flush(so, m, mhp) 7051 struct socket *so; 7052 struct mbuf *m; 7053 const struct sadb_msghdr *mhp; 7054 { 7055 struct sadb_msg *newmsg; 7056 struct secashead *sah, *nextsah; 7057 struct secasvar *sav, *nextsav; 7058 u_int16_t proto; 7059 u_int8_t state; 7060 u_int stateidx; 7061 7062 IPSEC_ASSERT(so != NULL, ("null socket")); 7063 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7064 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7065 7066 /* map satype to proto */ 7067 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7068 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7069 __func__)); 7070 return key_senderror(so, m, EINVAL); 7071 } 7072 7073 /* no SATYPE specified, i.e. flushing all SA. */ 7074 SAHTREE_LOCK(); 7075 for (sah = LIST_FIRST(&V_sahtree); 7076 sah != NULL; 7077 sah = nextsah) { 7078 nextsah = LIST_NEXT(sah, chain); 7079 7080 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7081 && proto != sah->saidx.proto) 7082 continue; 7083 7084 for (stateidx = 0; 7085 stateidx < _ARRAYLEN(saorder_state_alive); 7086 stateidx++) { 7087 state = saorder_state_any[stateidx]; 7088 for (sav = LIST_FIRST(&sah->savtree[state]); 7089 sav != NULL; 7090 sav = nextsav) { 7091 7092 nextsav = LIST_NEXT(sav, chain); 7093 7094 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 7095 KEY_FREESAV(&sav); 7096 } 7097 } 7098 7099 sah->state = SADB_SASTATE_DEAD; 7100 } 7101 SAHTREE_UNLOCK(); 7102 7103 if (m->m_len < sizeof(struct sadb_msg) || 7104 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 7105 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 7106 return key_senderror(so, m, ENOBUFS); 7107 } 7108 7109 if (m->m_next) 7110 m_freem(m->m_next); 7111 m->m_next = NULL; 7112 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 7113 newmsg = mtod(m, struct sadb_msg *); 7114 newmsg->sadb_msg_errno = 0; 7115 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 7116 7117 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7118 } 7119 7120 /* 7121 * SADB_DUMP processing 7122 * dump all entries including status of DEAD in SAD. 7123 * receive 7124 * <base> 7125 * from the ikmpd, and dump all secasvar leaves 7126 * and send, 7127 * <base> ..... 7128 * to the ikmpd. 7129 * 7130 * m will always be freed. 7131 */ 7132 static int 7133 key_dump(so, m, mhp) 7134 struct socket *so; 7135 struct mbuf *m; 7136 const struct sadb_msghdr *mhp; 7137 { 7138 struct secashead *sah; 7139 struct secasvar *sav; 7140 u_int16_t proto; 7141 u_int stateidx; 7142 u_int8_t satype; 7143 u_int8_t state; 7144 int cnt; 7145 struct sadb_msg *newmsg; 7146 struct mbuf *n; 7147 7148 IPSEC_ASSERT(so != NULL, ("null socket")); 7149 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7150 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7151 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7152 7153 /* map satype to proto */ 7154 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7155 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7156 __func__)); 7157 return key_senderror(so, m, EINVAL); 7158 } 7159 7160 /* count sav entries to be sent to the userland. */ 7161 cnt = 0; 7162 SAHTREE_LOCK(); 7163 LIST_FOREACH(sah, &V_sahtree, chain) { 7164 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7165 && proto != sah->saidx.proto) 7166 continue; 7167 7168 for (stateidx = 0; 7169 stateidx < _ARRAYLEN(saorder_state_any); 7170 stateidx++) { 7171 state = saorder_state_any[stateidx]; 7172 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7173 cnt++; 7174 } 7175 } 7176 } 7177 7178 if (cnt == 0) { 7179 SAHTREE_UNLOCK(); 7180 return key_senderror(so, m, ENOENT); 7181 } 7182 7183 /* send this to the userland, one at a time. */ 7184 newmsg = NULL; 7185 LIST_FOREACH(sah, &V_sahtree, chain) { 7186 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7187 && proto != sah->saidx.proto) 7188 continue; 7189 7190 /* map proto to satype */ 7191 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7192 SAHTREE_UNLOCK(); 7193 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7194 "SAD.\n", __func__)); 7195 return key_senderror(so, m, EINVAL); 7196 } 7197 7198 for (stateidx = 0; 7199 stateidx < _ARRAYLEN(saorder_state_any); 7200 stateidx++) { 7201 state = saorder_state_any[stateidx]; 7202 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7203 n = key_setdumpsa(sav, SADB_DUMP, satype, 7204 --cnt, mhp->msg->sadb_msg_pid); 7205 if (!n) { 7206 SAHTREE_UNLOCK(); 7207 return key_senderror(so, m, ENOBUFS); 7208 } 7209 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7210 } 7211 } 7212 } 7213 SAHTREE_UNLOCK(); 7214 7215 m_freem(m); 7216 return 0; 7217 } 7218 7219 /* 7220 * SADB_X_PROMISC processing 7221 * 7222 * m will always be freed. 7223 */ 7224 static int 7225 key_promisc(so, m, mhp) 7226 struct socket *so; 7227 struct mbuf *m; 7228 const struct sadb_msghdr *mhp; 7229 { 7230 int olen; 7231 7232 IPSEC_ASSERT(so != NULL, ("null socket")); 7233 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7234 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7235 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7236 7237 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7238 7239 if (olen < sizeof(struct sadb_msg)) { 7240 #if 1 7241 return key_senderror(so, m, EINVAL); 7242 #else 7243 m_freem(m); 7244 return 0; 7245 #endif 7246 } else if (olen == sizeof(struct sadb_msg)) { 7247 /* enable/disable promisc mode */ 7248 struct keycb *kp; 7249 7250 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7251 return key_senderror(so, m, EINVAL); 7252 mhp->msg->sadb_msg_errno = 0; 7253 switch (mhp->msg->sadb_msg_satype) { 7254 case 0: 7255 case 1: 7256 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7257 break; 7258 default: 7259 return key_senderror(so, m, EINVAL); 7260 } 7261 7262 /* send the original message back to everyone */ 7263 mhp->msg->sadb_msg_errno = 0; 7264 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7265 } else { 7266 /* send packet as is */ 7267 7268 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7269 7270 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7271 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7272 } 7273 } 7274 7275 static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 7276 const struct sadb_msghdr *)) = { 7277 NULL, /* SADB_RESERVED */ 7278 key_getspi, /* SADB_GETSPI */ 7279 key_update, /* SADB_UPDATE */ 7280 key_add, /* SADB_ADD */ 7281 key_delete, /* SADB_DELETE */ 7282 key_get, /* SADB_GET */ 7283 key_acquire2, /* SADB_ACQUIRE */ 7284 key_register, /* SADB_REGISTER */ 7285 NULL, /* SADB_EXPIRE */ 7286 key_flush, /* SADB_FLUSH */ 7287 key_dump, /* SADB_DUMP */ 7288 key_promisc, /* SADB_X_PROMISC */ 7289 NULL, /* SADB_X_PCHANGE */ 7290 key_spdadd, /* SADB_X_SPDUPDATE */ 7291 key_spdadd, /* SADB_X_SPDADD */ 7292 key_spddelete, /* SADB_X_SPDDELETE */ 7293 key_spdget, /* SADB_X_SPDGET */ 7294 NULL, /* SADB_X_SPDACQUIRE */ 7295 key_spddump, /* SADB_X_SPDDUMP */ 7296 key_spdflush, /* SADB_X_SPDFLUSH */ 7297 key_spdadd, /* SADB_X_SPDSETIDX */ 7298 NULL, /* SADB_X_SPDEXPIRE */ 7299 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7300 }; 7301 7302 /* 7303 * parse sadb_msg buffer to process PFKEYv2, 7304 * and create a data to response if needed. 7305 * I think to be dealed with mbuf directly. 7306 * IN: 7307 * msgp : pointer to pointer to a received buffer pulluped. 7308 * This is rewrited to response. 7309 * so : pointer to socket. 7310 * OUT: 7311 * length for buffer to send to user process. 7312 */ 7313 int 7314 key_parse(m, so) 7315 struct mbuf *m; 7316 struct socket *so; 7317 { 7318 struct sadb_msg *msg; 7319 struct sadb_msghdr mh; 7320 u_int orglen; 7321 int error; 7322 int target; 7323 7324 IPSEC_ASSERT(so != NULL, ("null socket")); 7325 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7326 7327 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7328 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7329 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7330 kdebug_sadb(msg)); 7331 #endif 7332 7333 if (m->m_len < sizeof(struct sadb_msg)) { 7334 m = m_pullup(m, sizeof(struct sadb_msg)); 7335 if (!m) 7336 return ENOBUFS; 7337 } 7338 msg = mtod(m, struct sadb_msg *); 7339 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7340 target = KEY_SENDUP_ONE; 7341 7342 if ((m->m_flags & M_PKTHDR) == 0 || 7343 m->m_pkthdr.len != m->m_pkthdr.len) { 7344 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7345 V_pfkeystat.out_invlen++; 7346 error = EINVAL; 7347 goto senderror; 7348 } 7349 7350 if (msg->sadb_msg_version != PF_KEY_V2) { 7351 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7352 __func__, msg->sadb_msg_version)); 7353 V_pfkeystat.out_invver++; 7354 error = EINVAL; 7355 goto senderror; 7356 } 7357 7358 if (msg->sadb_msg_type > SADB_MAX) { 7359 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7360 __func__, msg->sadb_msg_type)); 7361 V_pfkeystat.out_invmsgtype++; 7362 error = EINVAL; 7363 goto senderror; 7364 } 7365 7366 /* for old-fashioned code - should be nuked */ 7367 if (m->m_pkthdr.len > MCLBYTES) { 7368 m_freem(m); 7369 return ENOBUFS; 7370 } 7371 if (m->m_next) { 7372 struct mbuf *n; 7373 7374 MGETHDR(n, M_DONTWAIT, MT_DATA); 7375 if (n && m->m_pkthdr.len > MHLEN) { 7376 MCLGET(n, M_DONTWAIT); 7377 if ((n->m_flags & M_EXT) == 0) { 7378 m_free(n); 7379 n = NULL; 7380 } 7381 } 7382 if (!n) { 7383 m_freem(m); 7384 return ENOBUFS; 7385 } 7386 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7387 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7388 n->m_next = NULL; 7389 m_freem(m); 7390 m = n; 7391 } 7392 7393 /* align the mbuf chain so that extensions are in contiguous region. */ 7394 error = key_align(m, &mh); 7395 if (error) 7396 return error; 7397 7398 msg = mh.msg; 7399 7400 /* check SA type */ 7401 switch (msg->sadb_msg_satype) { 7402 case SADB_SATYPE_UNSPEC: 7403 switch (msg->sadb_msg_type) { 7404 case SADB_GETSPI: 7405 case SADB_UPDATE: 7406 case SADB_ADD: 7407 case SADB_DELETE: 7408 case SADB_GET: 7409 case SADB_ACQUIRE: 7410 case SADB_EXPIRE: 7411 ipseclog((LOG_DEBUG, "%s: must specify satype " 7412 "when msg type=%u.\n", __func__, 7413 msg->sadb_msg_type)); 7414 V_pfkeystat.out_invsatype++; 7415 error = EINVAL; 7416 goto senderror; 7417 } 7418 break; 7419 case SADB_SATYPE_AH: 7420 case SADB_SATYPE_ESP: 7421 case SADB_X_SATYPE_IPCOMP: 7422 case SADB_X_SATYPE_TCPSIGNATURE: 7423 switch (msg->sadb_msg_type) { 7424 case SADB_X_SPDADD: 7425 case SADB_X_SPDDELETE: 7426 case SADB_X_SPDGET: 7427 case SADB_X_SPDDUMP: 7428 case SADB_X_SPDFLUSH: 7429 case SADB_X_SPDSETIDX: 7430 case SADB_X_SPDUPDATE: 7431 case SADB_X_SPDDELETE2: 7432 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7433 __func__, msg->sadb_msg_type)); 7434 V_pfkeystat.out_invsatype++; 7435 error = EINVAL; 7436 goto senderror; 7437 } 7438 break; 7439 case SADB_SATYPE_RSVP: 7440 case SADB_SATYPE_OSPFV2: 7441 case SADB_SATYPE_RIPV2: 7442 case SADB_SATYPE_MIP: 7443 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7444 __func__, msg->sadb_msg_satype)); 7445 V_pfkeystat.out_invsatype++; 7446 error = EOPNOTSUPP; 7447 goto senderror; 7448 case 1: /* XXX: What does it do? */ 7449 if (msg->sadb_msg_type == SADB_X_PROMISC) 7450 break; 7451 /*FALLTHROUGH*/ 7452 default: 7453 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7454 __func__, msg->sadb_msg_satype)); 7455 V_pfkeystat.out_invsatype++; 7456 error = EINVAL; 7457 goto senderror; 7458 } 7459 7460 /* check field of upper layer protocol and address family */ 7461 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7462 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7463 struct sadb_address *src0, *dst0; 7464 u_int plen; 7465 7466 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7467 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7468 7469 /* check upper layer protocol */ 7470 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7471 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7472 "mismatched.\n", __func__)); 7473 V_pfkeystat.out_invaddr++; 7474 error = EINVAL; 7475 goto senderror; 7476 } 7477 7478 /* check family */ 7479 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7480 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7481 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7482 __func__)); 7483 V_pfkeystat.out_invaddr++; 7484 error = EINVAL; 7485 goto senderror; 7486 } 7487 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7488 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7489 ipseclog((LOG_DEBUG, "%s: address struct size " 7490 "mismatched.\n", __func__)); 7491 V_pfkeystat.out_invaddr++; 7492 error = EINVAL; 7493 goto senderror; 7494 } 7495 7496 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7497 case AF_INET: 7498 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7499 sizeof(struct sockaddr_in)) { 7500 V_pfkeystat.out_invaddr++; 7501 error = EINVAL; 7502 goto senderror; 7503 } 7504 break; 7505 case AF_INET6: 7506 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7507 sizeof(struct sockaddr_in6)) { 7508 V_pfkeystat.out_invaddr++; 7509 error = EINVAL; 7510 goto senderror; 7511 } 7512 break; 7513 default: 7514 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7515 __func__)); 7516 V_pfkeystat.out_invaddr++; 7517 error = EAFNOSUPPORT; 7518 goto senderror; 7519 } 7520 7521 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7522 case AF_INET: 7523 plen = sizeof(struct in_addr) << 3; 7524 break; 7525 case AF_INET6: 7526 plen = sizeof(struct in6_addr) << 3; 7527 break; 7528 default: 7529 plen = 0; /*fool gcc*/ 7530 break; 7531 } 7532 7533 /* check max prefix length */ 7534 if (src0->sadb_address_prefixlen > plen || 7535 dst0->sadb_address_prefixlen > plen) { 7536 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7537 __func__)); 7538 V_pfkeystat.out_invaddr++; 7539 error = EINVAL; 7540 goto senderror; 7541 } 7542 7543 /* 7544 * prefixlen == 0 is valid because there can be a case when 7545 * all addresses are matched. 7546 */ 7547 } 7548 7549 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7550 key_typesw[msg->sadb_msg_type] == NULL) { 7551 V_pfkeystat.out_invmsgtype++; 7552 error = EINVAL; 7553 goto senderror; 7554 } 7555 7556 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7557 7558 senderror: 7559 msg->sadb_msg_errno = error; 7560 return key_sendup_mbuf(so, m, target); 7561 } 7562 7563 static int 7564 key_senderror(so, m, code) 7565 struct socket *so; 7566 struct mbuf *m; 7567 int code; 7568 { 7569 struct sadb_msg *msg; 7570 7571 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7572 ("mbuf too small, len %u", m->m_len)); 7573 7574 msg = mtod(m, struct sadb_msg *); 7575 msg->sadb_msg_errno = code; 7576 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7577 } 7578 7579 /* 7580 * set the pointer to each header into message buffer. 7581 * m will be freed on error. 7582 * XXX larger-than-MCLBYTES extension? 7583 */ 7584 static int 7585 key_align(m, mhp) 7586 struct mbuf *m; 7587 struct sadb_msghdr *mhp; 7588 { 7589 struct mbuf *n; 7590 struct sadb_ext *ext; 7591 size_t off, end; 7592 int extlen; 7593 int toff; 7594 7595 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7596 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7597 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7598 ("mbuf too small, len %u", m->m_len)); 7599 7600 /* initialize */ 7601 bzero(mhp, sizeof(*mhp)); 7602 7603 mhp->msg = mtod(m, struct sadb_msg *); 7604 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7605 7606 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7607 extlen = end; /*just in case extlen is not updated*/ 7608 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7609 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7610 if (!n) { 7611 /* m is already freed */ 7612 return ENOBUFS; 7613 } 7614 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7615 7616 /* set pointer */ 7617 switch (ext->sadb_ext_type) { 7618 case SADB_EXT_SA: 7619 case SADB_EXT_ADDRESS_SRC: 7620 case SADB_EXT_ADDRESS_DST: 7621 case SADB_EXT_ADDRESS_PROXY: 7622 case SADB_EXT_LIFETIME_CURRENT: 7623 case SADB_EXT_LIFETIME_HARD: 7624 case SADB_EXT_LIFETIME_SOFT: 7625 case SADB_EXT_KEY_AUTH: 7626 case SADB_EXT_KEY_ENCRYPT: 7627 case SADB_EXT_IDENTITY_SRC: 7628 case SADB_EXT_IDENTITY_DST: 7629 case SADB_EXT_SENSITIVITY: 7630 case SADB_EXT_PROPOSAL: 7631 case SADB_EXT_SUPPORTED_AUTH: 7632 case SADB_EXT_SUPPORTED_ENCRYPT: 7633 case SADB_EXT_SPIRANGE: 7634 case SADB_X_EXT_POLICY: 7635 case SADB_X_EXT_SA2: 7636 #ifdef IPSEC_NAT_T 7637 case SADB_X_EXT_NAT_T_TYPE: 7638 case SADB_X_EXT_NAT_T_SPORT: 7639 case SADB_X_EXT_NAT_T_DPORT: 7640 case SADB_X_EXT_NAT_T_OAI: 7641 case SADB_X_EXT_NAT_T_OAR: 7642 case SADB_X_EXT_NAT_T_FRAG: 7643 #endif 7644 /* duplicate check */ 7645 /* 7646 * XXX Are there duplication payloads of either 7647 * KEY_AUTH or KEY_ENCRYPT ? 7648 */ 7649 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7650 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7651 "%u\n", __func__, ext->sadb_ext_type)); 7652 m_freem(m); 7653 V_pfkeystat.out_dupext++; 7654 return EINVAL; 7655 } 7656 break; 7657 default: 7658 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7659 __func__, ext->sadb_ext_type)); 7660 m_freem(m); 7661 V_pfkeystat.out_invexttype++; 7662 return EINVAL; 7663 } 7664 7665 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7666 7667 if (key_validate_ext(ext, extlen)) { 7668 m_freem(m); 7669 V_pfkeystat.out_invlen++; 7670 return EINVAL; 7671 } 7672 7673 n = m_pulldown(m, off, extlen, &toff); 7674 if (!n) { 7675 /* m is already freed */ 7676 return ENOBUFS; 7677 } 7678 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7679 7680 mhp->ext[ext->sadb_ext_type] = ext; 7681 mhp->extoff[ext->sadb_ext_type] = off; 7682 mhp->extlen[ext->sadb_ext_type] = extlen; 7683 } 7684 7685 if (off != end) { 7686 m_freem(m); 7687 V_pfkeystat.out_invlen++; 7688 return EINVAL; 7689 } 7690 7691 return 0; 7692 } 7693 7694 static int 7695 key_validate_ext(ext, len) 7696 const struct sadb_ext *ext; 7697 int len; 7698 { 7699 const struct sockaddr *sa; 7700 enum { NONE, ADDR } checktype = NONE; 7701 int baselen = 0; 7702 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7703 7704 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7705 return EINVAL; 7706 7707 /* if it does not match minimum/maximum length, bail */ 7708 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7709 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7710 return EINVAL; 7711 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7712 return EINVAL; 7713 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7714 return EINVAL; 7715 7716 /* more checks based on sadb_ext_type XXX need more */ 7717 switch (ext->sadb_ext_type) { 7718 case SADB_EXT_ADDRESS_SRC: 7719 case SADB_EXT_ADDRESS_DST: 7720 case SADB_EXT_ADDRESS_PROXY: 7721 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7722 checktype = ADDR; 7723 break; 7724 case SADB_EXT_IDENTITY_SRC: 7725 case SADB_EXT_IDENTITY_DST: 7726 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7727 SADB_X_IDENTTYPE_ADDR) { 7728 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7729 checktype = ADDR; 7730 } else 7731 checktype = NONE; 7732 break; 7733 default: 7734 checktype = NONE; 7735 break; 7736 } 7737 7738 switch (checktype) { 7739 case NONE: 7740 break; 7741 case ADDR: 7742 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7743 if (len < baselen + sal) 7744 return EINVAL; 7745 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7746 return EINVAL; 7747 break; 7748 } 7749 7750 return 0; 7751 } 7752 7753 void 7754 key_init(void) 7755 { 7756 int i; 7757 7758 for (i = 0; i < IPSEC_DIR_MAX; i++) 7759 LIST_INIT(&V_sptree[i]); 7760 7761 LIST_INIT(&V_sahtree); 7762 7763 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7764 LIST_INIT(&V_regtree[i]); 7765 7766 LIST_INIT(&V_acqtree); 7767 LIST_INIT(&V_spacqtree); 7768 7769 /* system default */ 7770 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7771 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7772 7773 if (!IS_DEFAULT_VNET(curvnet)) 7774 return; 7775 7776 SPTREE_LOCK_INIT(); 7777 REGTREE_LOCK_INIT(); 7778 SAHTREE_LOCK_INIT(); 7779 ACQ_LOCK_INIT(); 7780 SPACQ_LOCK_INIT(); 7781 7782 #ifndef IPSEC_DEBUG2 7783 timeout((void *)key_timehandler, (void *)0, hz); 7784 #endif /*IPSEC_DEBUG2*/ 7785 7786 /* initialize key statistics */ 7787 keystat.getspi_count = 1; 7788 7789 printf("IPsec: Initialized Security Association Processing.\n"); 7790 } 7791 7792 #ifdef VIMAGE 7793 void 7794 key_destroy(void) 7795 { 7796 struct secpolicy *sp, *nextsp; 7797 struct secacq *acq, *nextacq; 7798 struct secspacq *spacq, *nextspacq; 7799 struct secashead *sah, *nextsah; 7800 struct secreg *reg; 7801 int i; 7802 7803 SPTREE_LOCK(); 7804 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7805 for (sp = LIST_FIRST(&V_sptree[i]); 7806 sp != NULL; sp = nextsp) { 7807 nextsp = LIST_NEXT(sp, chain); 7808 if (__LIST_CHAINED(sp)) { 7809 LIST_REMOVE(sp, chain); 7810 free(sp, M_IPSEC_SP); 7811 } 7812 } 7813 } 7814 SPTREE_UNLOCK(); 7815 7816 SAHTREE_LOCK(); 7817 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7818 nextsah = LIST_NEXT(sah, chain); 7819 if (__LIST_CHAINED(sah)) { 7820 LIST_REMOVE(sah, chain); 7821 free(sah, M_IPSEC_SAH); 7822 } 7823 } 7824 SAHTREE_UNLOCK(); 7825 7826 REGTREE_LOCK(); 7827 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7828 LIST_FOREACH(reg, &V_regtree[i], chain) { 7829 if (__LIST_CHAINED(reg)) { 7830 LIST_REMOVE(reg, chain); 7831 free(reg, M_IPSEC_SAR); 7832 break; 7833 } 7834 } 7835 } 7836 REGTREE_UNLOCK(); 7837 7838 ACQ_LOCK(); 7839 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 7840 nextacq = LIST_NEXT(acq, chain); 7841 if (__LIST_CHAINED(acq)) { 7842 LIST_REMOVE(acq, chain); 7843 free(acq, M_IPSEC_SAQ); 7844 } 7845 } 7846 ACQ_UNLOCK(); 7847 7848 SPACQ_LOCK(); 7849 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL; 7850 spacq = nextspacq) { 7851 nextspacq = LIST_NEXT(spacq, chain); 7852 if (__LIST_CHAINED(spacq)) { 7853 LIST_REMOVE(spacq, chain); 7854 free(spacq, M_IPSEC_SAQ); 7855 } 7856 } 7857 SPACQ_UNLOCK(); 7858 } 7859 #endif 7860 7861 /* 7862 * XXX: maybe This function is called after INBOUND IPsec processing. 7863 * 7864 * Special check for tunnel-mode packets. 7865 * We must make some checks for consistency between inner and outer IP header. 7866 * 7867 * xxx more checks to be provided 7868 */ 7869 int 7870 key_checktunnelsanity(sav, family, src, dst) 7871 struct secasvar *sav; 7872 u_int family; 7873 caddr_t src; 7874 caddr_t dst; 7875 { 7876 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7877 7878 /* XXX: check inner IP header */ 7879 7880 return 1; 7881 } 7882 7883 /* record data transfer on SA, and update timestamps */ 7884 void 7885 key_sa_recordxfer(sav, m) 7886 struct secasvar *sav; 7887 struct mbuf *m; 7888 { 7889 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7890 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7891 if (!sav->lft_c) 7892 return; 7893 7894 /* 7895 * XXX Currently, there is a difference of bytes size 7896 * between inbound and outbound processing. 7897 */ 7898 sav->lft_c->bytes += m->m_pkthdr.len; 7899 /* to check bytes lifetime is done in key_timehandler(). */ 7900 7901 /* 7902 * We use the number of packets as the unit of 7903 * allocations. We increment the variable 7904 * whenever {esp,ah}_{in,out}put is called. 7905 */ 7906 sav->lft_c->allocations++; 7907 /* XXX check for expires? */ 7908 7909 /* 7910 * NOTE: We record CURRENT usetime by using wall clock, 7911 * in seconds. HARD and SOFT lifetime are measured by the time 7912 * difference (again in seconds) from usetime. 7913 * 7914 * usetime 7915 * v expire expire 7916 * -----+-----+--------+---> t 7917 * <--------------> HARD 7918 * <-----> SOFT 7919 */ 7920 sav->lft_c->usetime = time_second; 7921 /* XXX check for expires? */ 7922 7923 return; 7924 } 7925 7926 /* dumb version */ 7927 void 7928 key_sa_routechange(dst) 7929 struct sockaddr *dst; 7930 { 7931 struct secashead *sah; 7932 struct route *ro; 7933 7934 SAHTREE_LOCK(); 7935 LIST_FOREACH(sah, &V_sahtree, chain) { 7936 ro = &sah->sa_route; 7937 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7938 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7939 RTFREE(ro->ro_rt); 7940 ro->ro_rt = (struct rtentry *)NULL; 7941 } 7942 } 7943 SAHTREE_UNLOCK(); 7944 } 7945 7946 static void 7947 key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7948 { 7949 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7950 SAHTREE_LOCK_ASSERT(); 7951 7952 if (sav->state != state) { 7953 if (__LIST_CHAINED(sav)) 7954 LIST_REMOVE(sav, chain); 7955 sav->state = state; 7956 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7957 } 7958 } 7959 7960 void 7961 key_sa_stir_iv(sav) 7962 struct secasvar *sav; 7963 { 7964 7965 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7966 key_randomfill(sav->iv, sav->ivlen); 7967 } 7968 7969 /* XXX too much? */ 7970 static struct mbuf * 7971 key_alloc_mbuf(l) 7972 int l; 7973 { 7974 struct mbuf *m = NULL, *n; 7975 int len, t; 7976 7977 len = l; 7978 while (len > 0) { 7979 MGET(n, M_DONTWAIT, MT_DATA); 7980 if (n && len > MLEN) 7981 MCLGET(n, M_DONTWAIT); 7982 if (!n) { 7983 m_freem(m); 7984 return NULL; 7985 } 7986 7987 n->m_next = NULL; 7988 n->m_len = 0; 7989 n->m_len = M_TRAILINGSPACE(n); 7990 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7991 if (n->m_len > len) { 7992 t = (n->m_len - len) & ~(sizeof(long) - 1); 7993 n->m_data += t; 7994 n->m_len = len; 7995 } 7996 7997 len -= n->m_len; 7998 7999 if (m) 8000 m_cat(m, n); 8001 else 8002 m = n; 8003 } 8004 8005 return m; 8006 } 8007 8008 /* 8009 * Take one of the kernel's security keys and convert it into a PF_KEY 8010 * structure within an mbuf, suitable for sending up to a waiting 8011 * application in user land. 8012 * 8013 * IN: 8014 * src: A pointer to a kernel security key. 8015 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 8016 * OUT: 8017 * a valid mbuf or NULL indicating an error 8018 * 8019 */ 8020 8021 static struct mbuf * 8022 key_setkey(struct seckey *src, u_int16_t exttype) 8023 { 8024 struct mbuf *m; 8025 struct sadb_key *p; 8026 int len; 8027 8028 if (src == NULL) 8029 return NULL; 8030 8031 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 8032 m = key_alloc_mbuf(len); 8033 if (m == NULL) 8034 return NULL; 8035 p = mtod(m, struct sadb_key *); 8036 bzero(p, len); 8037 p->sadb_key_len = PFKEY_UNIT64(len); 8038 p->sadb_key_exttype = exttype; 8039 p->sadb_key_bits = src->bits; 8040 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 8041 8042 return m; 8043 } 8044 8045 /* 8046 * Take one of the kernel's lifetime data structures and convert it 8047 * into a PF_KEY structure within an mbuf, suitable for sending up to 8048 * a waiting application in user land. 8049 * 8050 * IN: 8051 * src: A pointer to a kernel lifetime structure. 8052 * exttype: Which type of lifetime this is. Refer to the PF_KEY 8053 * data structures for more information. 8054 * OUT: 8055 * a valid mbuf or NULL indicating an error 8056 * 8057 */ 8058 8059 static struct mbuf * 8060 key_setlifetime(struct seclifetime *src, u_int16_t exttype) 8061 { 8062 struct mbuf *m = NULL; 8063 struct sadb_lifetime *p; 8064 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 8065 8066 if (src == NULL) 8067 return NULL; 8068 8069 m = key_alloc_mbuf(len); 8070 if (m == NULL) 8071 return m; 8072 p = mtod(m, struct sadb_lifetime *); 8073 8074 bzero(p, len); 8075 p->sadb_lifetime_len = PFKEY_UNIT64(len); 8076 p->sadb_lifetime_exttype = exttype; 8077 p->sadb_lifetime_allocations = src->allocations; 8078 p->sadb_lifetime_bytes = src->bytes; 8079 p->sadb_lifetime_addtime = src->addtime; 8080 p->sadb_lifetime_usetime = src->usetime; 8081 8082 return m; 8083 8084 }
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