key.c revision 195699
1/* $FreeBSD: head/sys/netipsec/key.c 195699 2009-07-14 22:48:30Z rwatson $ */ 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#include <sys/vimage.h> 60 61#include <net/if.h> 62#include <net/route.h> 63#include <net/raw_cb.h> 64#include <net/vnet.h> 65 66#include <netinet/in.h> 67#include <netinet/in_systm.h> 68#include <netinet/ip.h> 69#include <netinet/in_var.h> 70 71#ifdef INET6 72#include <netinet/ip6.h> 73#include <netinet6/in6_var.h> 74#include <netinet6/ip6_var.h> 75#endif /* INET6 */ 76 77#ifdef INET 78#include <netinet/in_pcb.h> 79#endif 80#ifdef INET6 81#include <netinet6/in6_pcb.h> 82#endif /* INET6 */ 83 84#include <net/pfkeyv2.h> 85#include <netipsec/keydb.h> 86#include <netipsec/key.h> 87#include <netipsec/keysock.h> 88#include <netipsec/key_debug.h> 89 90#include <netipsec/ipsec.h> 91#ifdef INET6 92#include <netipsec/ipsec6.h> 93#endif 94 95#include <netipsec/xform.h> 96 97#include <machine/stdarg.h> 98 99/* randomness */ 100#include <sys/random.h> 101 102#define FULLMASK 0xff 103#define _BITS(bytes) ((bytes) << 3) 104 105/* 106 * Note on SA reference counting: 107 * - SAs that are not in DEAD state will have (total external reference + 1) 108 * following value in reference count field. they cannot be freed and are 109 * referenced from SA header. 110 * - SAs that are in DEAD state will have (total external reference) 111 * in reference count field. they are ready to be freed. reference from 112 * SA header will be removed in key_delsav(), when the reference count 113 * field hits 0 (= no external reference other than from SA header. 114 */ 115 116VNET_DEFINE(u_int32_t, key_debug_level) = 0; 117static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 118#define V_key_spi_trycnt VNET_GET(key_spi_trycnt) 119static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 120#define V_key_spi_minval VNET_GET(key_spi_minval) 121static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 122#define V_key_spi_maxval VNET_GET(key_spi_maxval) 123static VNET_DEFINE(u_int32_t, policy_id) = 0; 124#define V_policy_id VNET_GET(policy_id) 125/*interval to initialize randseed,1(m)*/ 126static VNET_DEFINE(u_int, key_int_random) = 60; 127#define V_key_int_random VNET_GET(key_int_random) 128/* interval to expire acquiring, 30(s)*/ 129static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 130#define V_key_larval_lifetime VNET_GET(key_larval_lifetime) 131/* counter for blocking SADB_ACQUIRE.*/ 132static VNET_DEFINE(int, key_blockacq_count) = 10; 133#define V_key_blockacq_count VNET_GET(key_blockacq_count) 134/* lifetime for blocking SADB_ACQUIRE.*/ 135static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 136#define V_key_blockacq_lifetime VNET_GET(key_blockacq_lifetime) 137/* preferred old sa rather than new sa.*/ 138static VNET_DEFINE(int, key_preferred_oldsa) = 1; 139#define V_key_preferred_oldsa VNET_GET(key_preferred_oldsa) 140 141static VNET_DEFINE(u_int32_t, acq_seq) = 0; 142#define V_acq_seq VNET_GET(acq_seq) 143 144 /* SPD */ 145static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 146#define V_sptree VNET_GET(sptree) 147static struct mtx sptree_lock; 148#define SPTREE_LOCK_INIT() \ 149 mtx_init(&sptree_lock, "sptree", \ 150 "fast ipsec security policy database", MTX_DEF) 151#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 152#define SPTREE_LOCK() mtx_lock(&sptree_lock) 153#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 154#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 155 156static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 157#define V_sahtree VNET_GET(sahtree) 158static struct mtx sahtree_lock; 159#define SAHTREE_LOCK_INIT() \ 160 mtx_init(&sahtree_lock, "sahtree", \ 161 "fast ipsec security association database", MTX_DEF) 162#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 163#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 164#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 165#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 166 167 /* registed list */ 168static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 169#define V_regtree VNET_GET(regtree) 170static struct mtx regtree_lock; 171#define REGTREE_LOCK_INIT() \ 172 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 173#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 174#define REGTREE_LOCK() mtx_lock(®tree_lock) 175#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 176#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 177 178static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 179#define V_acqtree VNET_GET(acqtree) 180static struct mtx acq_lock; 181#define ACQ_LOCK_INIT() \ 182 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 183#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 184#define ACQ_LOCK() mtx_lock(&acq_lock) 185#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 186#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 187 188 /* SP acquiring list */ 189static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 190#define V_spacqtree VNET_GET(spacqtree) 191static struct mtx spacq_lock; 192#define SPACQ_LOCK_INIT() \ 193 mtx_init(&spacq_lock, "spacqtree", \ 194 "fast ipsec security policy acquire list", MTX_DEF) 195#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 196#define SPACQ_LOCK() mtx_lock(&spacq_lock) 197#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 198#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 199 200/* search order for SAs */ 201static const u_int saorder_state_valid_prefer_old[] = { 202 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 203}; 204static const u_int saorder_state_valid_prefer_new[] = { 205 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 206}; 207static const u_int saorder_state_alive[] = { 208 /* except DEAD */ 209 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 210}; 211static const u_int saorder_state_any[] = { 212 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 213 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 214}; 215 216static const int minsize[] = { 217 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 218 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 220 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 221 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 223 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 224 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 225 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 226 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 227 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 228 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 229 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 230 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 231 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 232 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 233 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 234 0, /* SADB_X_EXT_KMPRIVATE */ 235 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 236 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 237 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 238 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 239 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 240 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 241 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 242 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 243}; 244static const int maxsize[] = { 245 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 246 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 248 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 249 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 250 0, /* SADB_EXT_ADDRESS_SRC */ 251 0, /* SADB_EXT_ADDRESS_DST */ 252 0, /* SADB_EXT_ADDRESS_PROXY */ 253 0, /* SADB_EXT_KEY_AUTH */ 254 0, /* SADB_EXT_KEY_ENCRYPT */ 255 0, /* SADB_EXT_IDENTITY_SRC */ 256 0, /* SADB_EXT_IDENTITY_DST */ 257 0, /* SADB_EXT_SENSITIVITY */ 258 0, /* SADB_EXT_PROPOSAL */ 259 0, /* SADB_EXT_SUPPORTED_AUTH */ 260 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 261 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 262 0, /* SADB_X_EXT_KMPRIVATE */ 263 0, /* SADB_X_EXT_POLICY */ 264 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 265 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 266 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 267 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 268 0, /* SADB_X_EXT_NAT_T_OAI */ 269 0, /* SADB_X_EXT_NAT_T_OAR */ 270 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 271}; 272 273static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 274#define V_ipsec_esp_keymin VNET_GET(ipsec_esp_keymin) 275static VNET_DEFINE(int, ipsec_esp_auth) = 0; 276#define V_ipsec_esp_auth VNET_GET(ipsec_esp_auth) 277static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 278#define V_ipsec_ah_keymin VNET_GET(ipsec_ah_keymin) 279 280#ifdef SYSCTL_DECL 281SYSCTL_DECL(_net_key); 282#endif 283 284SYSCTL_VNET_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 285 CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 286 287/* max count of trial for the decision of spi value */ 288SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 289 CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 290 291/* minimum spi value to allocate automatically. */ 292SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MIN_VALUE, 293 spi_minval, CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 294 295/* maximun spi value to allocate automatically. */ 296SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MAX_VALUE, 297 spi_maxval, CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 298 299/* interval to initialize randseed */ 300SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 301 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 302 303/* lifetime for larval SA */ 304SYSCTL_VNET_INT(_net_key, KEYCTL_LARVAL_LIFETIME, 305 larval_lifetime, CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 306 307/* counter for blocking to send SADB_ACQUIRE to IKEd */ 308SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, 309 blockacq_count, CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 310 311/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 312SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 313 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 314 315/* ESP auth */ 316SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 317 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 318 319/* minimum ESP key length */ 320SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 321 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 322 323/* minimum AH key length */ 324SYSCTL_VNET_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 325 CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 326 327/* perfered old SA rather than new SA */ 328SYSCTL_VNET_INT(_net_key, KEYCTL_PREFERED_OLDSA, 329 preferred_oldsa, CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 330 331#define __LIST_CHAINED(elm) \ 332 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 333#define LIST_INSERT_TAIL(head, elm, type, field) \ 334do {\ 335 struct type *curelm = LIST_FIRST(head); \ 336 if (curelm == NULL) {\ 337 LIST_INSERT_HEAD(head, elm, field); \ 338 } else { \ 339 while (LIST_NEXT(curelm, field)) \ 340 curelm = LIST_NEXT(curelm, field);\ 341 LIST_INSERT_AFTER(curelm, elm, field);\ 342 }\ 343} while (0) 344 345#define KEY_CHKSASTATE(head, sav, name) \ 346do { \ 347 if ((head) != (sav)) { \ 348 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 349 (name), (head), (sav))); \ 350 continue; \ 351 } \ 352} while (0) 353 354#define KEY_CHKSPDIR(head, sp, name) \ 355do { \ 356 if ((head) != (sp)) { \ 357 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 358 "anyway continue.\n", \ 359 (name), (head), (sp))); \ 360 } \ 361} while (0) 362 363MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 364MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 365MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 366MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 367MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 368MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 369MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 370 371/* 372 * set parameters into secpolicyindex buffer. 373 * Must allocate secpolicyindex buffer passed to this function. 374 */ 375#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 376do { \ 377 bzero((idx), sizeof(struct secpolicyindex)); \ 378 (idx)->dir = (_dir); \ 379 (idx)->prefs = (ps); \ 380 (idx)->prefd = (pd); \ 381 (idx)->ul_proto = (ulp); \ 382 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 383 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 384} while (0) 385 386/* 387 * set parameters into secasindex buffer. 388 * Must allocate secasindex buffer before calling this function. 389 */ 390#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 391do { \ 392 bzero((idx), sizeof(struct secasindex)); \ 393 (idx)->proto = (p); \ 394 (idx)->mode = (m); \ 395 (idx)->reqid = (r); \ 396 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 397 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 398} while (0) 399 400/* key statistics */ 401struct _keystat { 402 u_long getspi_count; /* the avarage of count to try to get new SPI */ 403} keystat; 404 405struct sadb_msghdr { 406 struct sadb_msg *msg; 407 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 408 int extoff[SADB_EXT_MAX + 1]; 409 int extlen[SADB_EXT_MAX + 1]; 410}; 411 412static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 413static void key_freesp_so __P((struct secpolicy **)); 414static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 415static void key_delsp __P((struct secpolicy *)); 416static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 417static void _key_delsp(struct secpolicy *sp); 418static struct secpolicy *key_getspbyid __P((u_int32_t)); 419static u_int32_t key_newreqid __P((void)); 420static struct mbuf *key_gather_mbuf __P((struct mbuf *, 421 const struct sadb_msghdr *, int, int, ...)); 422static int key_spdadd __P((struct socket *, struct mbuf *, 423 const struct sadb_msghdr *)); 424static u_int32_t key_getnewspid __P((void)); 425static int key_spddelete __P((struct socket *, struct mbuf *, 426 const struct sadb_msghdr *)); 427static int key_spddelete2 __P((struct socket *, struct mbuf *, 428 const struct sadb_msghdr *)); 429static int key_spdget __P((struct socket *, struct mbuf *, 430 const struct sadb_msghdr *)); 431static int key_spdflush __P((struct socket *, struct mbuf *, 432 const struct sadb_msghdr *)); 433static int key_spddump __P((struct socket *, struct mbuf *, 434 const struct sadb_msghdr *)); 435static struct mbuf *key_setdumpsp __P((struct secpolicy *, 436 u_int8_t, u_int32_t, u_int32_t)); 437static u_int key_getspreqmsglen __P((struct secpolicy *)); 438static int key_spdexpire __P((struct secpolicy *)); 439static struct secashead *key_newsah __P((struct secasindex *)); 440static void key_delsah __P((struct secashead *)); 441static struct secasvar *key_newsav __P((struct mbuf *, 442 const struct sadb_msghdr *, struct secashead *, int *, 443 const char*, int)); 444#define KEY_NEWSAV(m, sadb, sah, e) \ 445 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 446static void key_delsav __P((struct secasvar *)); 447static struct secashead *key_getsah __P((struct secasindex *)); 448static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 449static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 450static int key_setsaval __P((struct secasvar *, struct mbuf *, 451 const struct sadb_msghdr *)); 452static int key_mature __P((struct secasvar *)); 453static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 454 u_int8_t, u_int32_t, u_int32_t)); 455static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 456 u_int32_t, pid_t, u_int16_t)); 457static struct mbuf *key_setsadbsa __P((struct secasvar *)); 458static struct mbuf *key_setsadbaddr __P((u_int16_t, 459 const struct sockaddr *, u_int8_t, u_int16_t)); 460#ifdef IPSEC_NAT_T 461static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 462static struct mbuf *key_setsadbxtype(u_int16_t); 463#endif 464static void key_porttosaddr(struct sockaddr *, u_int16_t); 465#define KEY_PORTTOSADDR(saddr, port) \ 466 key_porttosaddr((struct sockaddr *)(saddr), (port)) 467static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 468static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 469 u_int32_t)); 470static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 471 struct malloc_type *); 472static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 473 struct malloc_type *type); 474#ifdef INET6 475static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 476#endif 477 478/* flags for key_cmpsaidx() */ 479#define CMP_HEAD 1 /* protocol, addresses. */ 480#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 481#define CMP_REQID 3 /* additionally HEAD, reaid. */ 482#define CMP_EXACTLY 4 /* all elements. */ 483static int key_cmpsaidx 484 __P((const struct secasindex *, const struct secasindex *, int)); 485 486static int key_cmpspidx_exactly 487 __P((struct secpolicyindex *, struct secpolicyindex *)); 488static int key_cmpspidx_withmask 489 __P((struct secpolicyindex *, struct secpolicyindex *)); 490static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 491static int key_bbcmp __P((const void *, const void *, u_int)); 492static u_int16_t key_satype2proto __P((u_int8_t)); 493static u_int8_t key_proto2satype __P((u_int16_t)); 494 495static int key_getspi __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 498 struct secasindex *)); 499static int key_update __P((struct socket *, struct mbuf *, 500 const struct sadb_msghdr *)); 501#ifdef IPSEC_DOSEQCHECK 502static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 503#endif 504static int key_add __P((struct socket *, struct mbuf *, 505 const struct sadb_msghdr *)); 506static int key_setident __P((struct secashead *, struct mbuf *, 507 const struct sadb_msghdr *)); 508static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 509 const struct sadb_msghdr *)); 510static int key_delete __P((struct socket *, struct mbuf *, 511 const struct sadb_msghdr *)); 512static int key_get __P((struct socket *, struct mbuf *, 513 const struct sadb_msghdr *)); 514 515static void key_getcomb_setlifetime __P((struct sadb_comb *)); 516static struct mbuf *key_getcomb_esp __P((void)); 517static struct mbuf *key_getcomb_ah __P((void)); 518static struct mbuf *key_getcomb_ipcomp __P((void)); 519static struct mbuf *key_getprop __P((const struct secasindex *)); 520 521static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 522static struct secacq *key_newacq __P((const struct secasindex *)); 523static struct secacq *key_getacq __P((const struct secasindex *)); 524static struct secacq *key_getacqbyseq __P((u_int32_t)); 525static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 526static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 527static int key_acquire2 __P((struct socket *, struct mbuf *, 528 const struct sadb_msghdr *)); 529static int key_register __P((struct socket *, struct mbuf *, 530 const struct sadb_msghdr *)); 531static int key_expire __P((struct secasvar *)); 532static int key_flush __P((struct socket *, struct mbuf *, 533 const struct sadb_msghdr *)); 534static int key_dump __P((struct socket *, struct mbuf *, 535 const struct sadb_msghdr *)); 536static int key_promisc __P((struct socket *, struct mbuf *, 537 const struct sadb_msghdr *)); 538static int key_senderror __P((struct socket *, struct mbuf *, int)); 539static int key_validate_ext __P((const struct sadb_ext *, int)); 540static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 541static struct mbuf *key_setlifetime(struct seclifetime *src, 542 u_int16_t exttype); 543static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 544 545#if 0 546static const char *key_getfqdn __P((void)); 547static const char *key_getuserfqdn __P((void)); 548#endif 549static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 550static struct mbuf *key_alloc_mbuf __P((int)); 551 552static __inline void 553sa_initref(struct secasvar *sav) 554{ 555 556 refcount_init(&sav->refcnt, 1); 557} 558static __inline void 559sa_addref(struct secasvar *sav) 560{ 561 562 refcount_acquire(&sav->refcnt); 563 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 564} 565static __inline int 566sa_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 */ 586void 587key_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 */ 599int 600key_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 */ 614struct secpolicy * 615key_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; 643found: 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 */ 666struct secpolicy * 667key_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; 706found: 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 */ 728struct secpolicy * 729key_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; 787found: 788 if (sp) { 789 sp->lastused = time_second; 790 SP_ADDREF(sp); 791 } 792 SPTREE_UNLOCK(); 793done: 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 */ 807int 808key_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 */ 901static struct secasvar * 902key_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 */ 949static struct secasvar * 950key_do_allocsa_policy(struct secashead *sah, u_int state) 951{ 952 struct secasvar *sav, *nextsav, *candidate, *d; 953 954 /* initilize */ 955 candidate = NULL; 956 957 SAHTREE_LOCK(); 958 for (sav = LIST_FIRST(&sah->savtree[state]); 959 sav != NULL; 960 sav = nextsav) { 961 962 nextsav = LIST_NEXT(sav, chain); 963 964 /* sanity check */ 965 KEY_CHKSASTATE(sav->state, state, __func__); 966 967 /* initialize */ 968 if (candidate == NULL) { 969 candidate = sav; 970 continue; 971 } 972 973 /* Which SA is the better ? */ 974 975 IPSEC_ASSERT(candidate->lft_c != NULL, 976 ("null candidate lifetime")); 977 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 978 979 /* What the best method is to compare ? */ 980 if (V_key_preferred_oldsa) { 981 if (candidate->lft_c->addtime > 982 sav->lft_c->addtime) { 983 candidate = sav; 984 } 985 continue; 986 /*NOTREACHED*/ 987 } 988 989 /* preferred new sa rather than old sa */ 990 if (candidate->lft_c->addtime < 991 sav->lft_c->addtime) { 992 d = candidate; 993 candidate = sav; 994 } else 995 d = sav; 996 997 /* 998 * prepared to delete the SA when there is more 999 * suitable candidate and the lifetime of the SA is not 1000 * permanent. 1001 */ 1002 if (d->lft_h->addtime != 0) { 1003 struct mbuf *m, *result; 1004 u_int8_t satype; 1005 1006 key_sa_chgstate(d, SADB_SASTATE_DEAD); 1007 1008 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 1009 1010 satype = key_proto2satype(d->sah->saidx.proto); 1011 if (satype == 0) 1012 goto msgfail; 1013 1014 m = key_setsadbmsg(SADB_DELETE, 0, 1015 satype, 0, 0, d->refcnt - 1); 1016 if (!m) 1017 goto msgfail; 1018 result = m; 1019 1020 /* set sadb_address for saidx's. */ 1021 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1022 &d->sah->saidx.src.sa, 1023 d->sah->saidx.src.sa.sa_len << 3, 1024 IPSEC_ULPROTO_ANY); 1025 if (!m) 1026 goto msgfail; 1027 m_cat(result, m); 1028 1029 /* set sadb_address for saidx's. */ 1030 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1031 &d->sah->saidx.dst.sa, 1032 d->sah->saidx.dst.sa.sa_len << 3, 1033 IPSEC_ULPROTO_ANY); 1034 if (!m) 1035 goto msgfail; 1036 m_cat(result, m); 1037 1038 /* create SA extension */ 1039 m = key_setsadbsa(d); 1040 if (!m) 1041 goto msgfail; 1042 m_cat(result, m); 1043 1044 if (result->m_len < sizeof(struct sadb_msg)) { 1045 result = m_pullup(result, 1046 sizeof(struct sadb_msg)); 1047 if (result == NULL) 1048 goto msgfail; 1049 } 1050 1051 result->m_pkthdr.len = 0; 1052 for (m = result; m; m = m->m_next) 1053 result->m_pkthdr.len += m->m_len; 1054 mtod(result, struct sadb_msg *)->sadb_msg_len = 1055 PFKEY_UNIT64(result->m_pkthdr.len); 1056 1057 if (key_sendup_mbuf(NULL, result, 1058 KEY_SENDUP_REGISTERED)) 1059 goto msgfail; 1060 msgfail: 1061 KEY_FREESAV(&d); 1062 } 1063 } 1064 if (candidate) { 1065 sa_addref(candidate); 1066 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1067 printf("DP %s cause refcnt++:%d SA:%p\n", 1068 __func__, candidate->refcnt, candidate)); 1069 } 1070 SAHTREE_UNLOCK(); 1071 1072 return candidate; 1073} 1074 1075/* 1076 * allocating a usable SA entry for a *INBOUND* packet. 1077 * Must call key_freesav() later. 1078 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1079 * NULL: not found, or error occured. 1080 * 1081 * In the comparison, no source address is used--for RFC2401 conformance. 1082 * To quote, from section 4.1: 1083 * A security association is uniquely identified by a triple consisting 1084 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1085 * security protocol (AH or ESP) identifier. 1086 * Note that, however, we do need to keep source address in IPsec SA. 1087 * IKE specification and PF_KEY specification do assume that we 1088 * keep source address in IPsec SA. We see a tricky situation here. 1089 */ 1090struct secasvar * 1091key_allocsa( 1092 union sockaddr_union *dst, 1093 u_int proto, 1094 u_int32_t spi, 1095 const char* where, int tag) 1096{ 1097 struct secashead *sah; 1098 struct secasvar *sav; 1099 u_int stateidx, arraysize, state; 1100 const u_int *saorder_state_valid; 1101 int chkport; 1102 1103 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1104 1105 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1106 printf("DP %s from %s:%u\n", __func__, where, tag)); 1107 1108#ifdef IPSEC_NAT_T 1109 chkport = (dst->sa.sa_family == AF_INET && 1110 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1111 dst->sin.sin_port != 0); 1112#else 1113 chkport = 0; 1114#endif 1115 1116 /* 1117 * searching SAD. 1118 * XXX: to be checked internal IP header somewhere. Also when 1119 * IPsec tunnel packet is received. But ESP tunnel mode is 1120 * encrypted so we can't check internal IP header. 1121 */ 1122 SAHTREE_LOCK(); 1123 if (V_key_preferred_oldsa) { 1124 saorder_state_valid = saorder_state_valid_prefer_old; 1125 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1126 } else { 1127 saorder_state_valid = saorder_state_valid_prefer_new; 1128 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1129 } 1130 LIST_FOREACH(sah, &V_sahtree, chain) { 1131 /* search valid state */ 1132 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1133 state = saorder_state_valid[stateidx]; 1134 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1135 /* sanity check */ 1136 KEY_CHKSASTATE(sav->state, state, __func__); 1137 /* do not return entries w/ unusable state */ 1138 if (sav->state != SADB_SASTATE_MATURE && 1139 sav->state != SADB_SASTATE_DYING) 1140 continue; 1141 if (proto != sav->sah->saidx.proto) 1142 continue; 1143 if (spi != sav->spi) 1144 continue; 1145#if 0 /* don't check src */ 1146 /* check src address */ 1147 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, chkport) != 0) 1148 continue; 1149#endif 1150 /* check dst address */ 1151 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, chkport) != 0) 1152 continue; 1153 sa_addref(sav); 1154 goto done; 1155 } 1156 } 1157 } 1158 sav = NULL; 1159done: 1160 SAHTREE_UNLOCK(); 1161 1162 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1163 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1164 sav, sav ? sav->refcnt : 0)); 1165 return sav; 1166} 1167 1168/* 1169 * Must be called after calling key_allocsp(). 1170 * For both the packet without socket and key_freeso(). 1171 */ 1172void 1173_key_freesp(struct secpolicy **spp, const char* where, int tag) 1174{ 1175 struct secpolicy *sp = *spp; 1176 1177 IPSEC_ASSERT(sp != NULL, ("null sp")); 1178 1179 SPTREE_LOCK(); 1180 SP_DELREF(sp); 1181 1182 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1183 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1184 __func__, sp, sp->id, where, tag, sp->refcnt)); 1185 1186 if (sp->refcnt == 0) { 1187 *spp = NULL; 1188 key_delsp(sp); 1189 } 1190 SPTREE_UNLOCK(); 1191} 1192 1193/* 1194 * Must be called after calling key_allocsp(). 1195 * For the packet with socket. 1196 */ 1197void 1198key_freeso(struct socket *so) 1199{ 1200 IPSEC_ASSERT(so != NULL, ("null so")); 1201 1202 switch (so->so_proto->pr_domain->dom_family) { 1203#if defined(INET) || defined(INET6) 1204#ifdef INET 1205 case PF_INET: 1206#endif 1207#ifdef INET6 1208 case PF_INET6: 1209#endif 1210 { 1211 struct inpcb *pcb = sotoinpcb(so); 1212 1213 /* Does it have a PCB ? */ 1214 if (pcb == NULL) 1215 return; 1216 key_freesp_so(&pcb->inp_sp->sp_in); 1217 key_freesp_so(&pcb->inp_sp->sp_out); 1218 } 1219 break; 1220#endif /* INET || INET6 */ 1221 default: 1222 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1223 __func__, so->so_proto->pr_domain->dom_family)); 1224 return; 1225 } 1226} 1227 1228static void 1229key_freesp_so(struct secpolicy **sp) 1230{ 1231 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1232 1233 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1234 (*sp)->policy == IPSEC_POLICY_BYPASS) 1235 return; 1236 1237 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1238 ("invalid policy %u", (*sp)->policy)); 1239 KEY_FREESP(sp); 1240} 1241 1242/* 1243 * Must be called after calling key_allocsa(). 1244 * This function is called by key_freesp() to free some SA allocated 1245 * for a policy. 1246 */ 1247void 1248key_freesav(struct secasvar **psav, const char* where, int tag) 1249{ 1250 struct secasvar *sav = *psav; 1251 1252 IPSEC_ASSERT(sav != NULL, ("null sav")); 1253 1254 if (sa_delref(sav)) { 1255 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1256 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1257 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1258 *psav = NULL; 1259 key_delsav(sav); 1260 } else { 1261 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1262 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1263 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1264 } 1265} 1266 1267/* %%% SPD management */ 1268/* 1269 * free security policy entry. 1270 */ 1271static void 1272key_delsp(struct secpolicy *sp) 1273{ 1274 struct ipsecrequest *isr, *nextisr; 1275 1276 IPSEC_ASSERT(sp != NULL, ("null sp")); 1277 SPTREE_LOCK_ASSERT(); 1278 1279 sp->state = IPSEC_SPSTATE_DEAD; 1280 1281 IPSEC_ASSERT(sp->refcnt == 0, 1282 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1283 1284 /* remove from SP index */ 1285 if (__LIST_CHAINED(sp)) 1286 LIST_REMOVE(sp, chain); 1287 1288 for (isr = sp->req; isr != NULL; isr = nextisr) { 1289 if (isr->sav != NULL) { 1290 KEY_FREESAV(&isr->sav); 1291 isr->sav = NULL; 1292 } 1293 1294 nextisr = isr->next; 1295 ipsec_delisr(isr); 1296 } 1297 _key_delsp(sp); 1298} 1299 1300/* 1301 * search SPD 1302 * OUT: NULL : not found 1303 * others : found, pointer to a SP. 1304 */ 1305static struct secpolicy * 1306key_getsp(struct secpolicyindex *spidx) 1307{ 1308 struct secpolicy *sp; 1309 1310 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1311 1312 SPTREE_LOCK(); 1313 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1314 if (sp->state == IPSEC_SPSTATE_DEAD) 1315 continue; 1316 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1317 SP_ADDREF(sp); 1318 break; 1319 } 1320 } 1321 SPTREE_UNLOCK(); 1322 1323 return sp; 1324} 1325 1326/* 1327 * get SP by index. 1328 * OUT: NULL : not found 1329 * others : found, pointer to a SP. 1330 */ 1331static struct secpolicy * 1332key_getspbyid(u_int32_t id) 1333{ 1334 struct secpolicy *sp; 1335 1336 SPTREE_LOCK(); 1337 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1338 if (sp->state == IPSEC_SPSTATE_DEAD) 1339 continue; 1340 if (sp->id == id) { 1341 SP_ADDREF(sp); 1342 goto done; 1343 } 1344 } 1345 1346 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1347 if (sp->state == IPSEC_SPSTATE_DEAD) 1348 continue; 1349 if (sp->id == id) { 1350 SP_ADDREF(sp); 1351 goto done; 1352 } 1353 } 1354done: 1355 SPTREE_UNLOCK(); 1356 1357 return sp; 1358} 1359 1360struct secpolicy * 1361key_newsp(const char* where, int tag) 1362{ 1363 struct secpolicy *newsp = NULL; 1364 1365 newsp = (struct secpolicy *) 1366 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1367 if (newsp) { 1368 SECPOLICY_LOCK_INIT(newsp); 1369 newsp->refcnt = 1; 1370 newsp->req = NULL; 1371 } 1372 1373 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1374 printf("DP %s from %s:%u return SP:%p\n", __func__, 1375 where, tag, newsp)); 1376 return newsp; 1377} 1378 1379static void 1380_key_delsp(struct secpolicy *sp) 1381{ 1382 SECPOLICY_LOCK_DESTROY(sp); 1383 free(sp, M_IPSEC_SP); 1384} 1385 1386/* 1387 * create secpolicy structure from sadb_x_policy structure. 1388 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1389 * so must be set properly later. 1390 */ 1391struct secpolicy * 1392key_msg2sp(xpl0, len, error) 1393 struct sadb_x_policy *xpl0; 1394 size_t len; 1395 int *error; 1396{ 1397 struct secpolicy *newsp; 1398 1399 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1400 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1401 1402 if (len != PFKEY_EXTLEN(xpl0)) { 1403 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1404 *error = EINVAL; 1405 return NULL; 1406 } 1407 1408 if ((newsp = KEY_NEWSP()) == NULL) { 1409 *error = ENOBUFS; 1410 return NULL; 1411 } 1412 1413 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1414 newsp->policy = xpl0->sadb_x_policy_type; 1415 1416 /* check policy */ 1417 switch (xpl0->sadb_x_policy_type) { 1418 case IPSEC_POLICY_DISCARD: 1419 case IPSEC_POLICY_NONE: 1420 case IPSEC_POLICY_ENTRUST: 1421 case IPSEC_POLICY_BYPASS: 1422 newsp->req = NULL; 1423 break; 1424 1425 case IPSEC_POLICY_IPSEC: 1426 { 1427 int tlen; 1428 struct sadb_x_ipsecrequest *xisr; 1429 struct ipsecrequest **p_isr = &newsp->req; 1430 1431 /* validity check */ 1432 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1433 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1434 __func__)); 1435 KEY_FREESP(&newsp); 1436 *error = EINVAL; 1437 return NULL; 1438 } 1439 1440 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1441 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1442 1443 while (tlen > 0) { 1444 /* length check */ 1445 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1446 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1447 "length.\n", __func__)); 1448 KEY_FREESP(&newsp); 1449 *error = EINVAL; 1450 return NULL; 1451 } 1452 1453 /* allocate request buffer */ 1454 /* NB: data structure is zero'd */ 1455 *p_isr = ipsec_newisr(); 1456 if ((*p_isr) == NULL) { 1457 ipseclog((LOG_DEBUG, 1458 "%s: No more memory.\n", __func__)); 1459 KEY_FREESP(&newsp); 1460 *error = ENOBUFS; 1461 return NULL; 1462 } 1463 1464 /* set values */ 1465 switch (xisr->sadb_x_ipsecrequest_proto) { 1466 case IPPROTO_ESP: 1467 case IPPROTO_AH: 1468 case IPPROTO_IPCOMP: 1469 break; 1470 default: 1471 ipseclog((LOG_DEBUG, 1472 "%s: invalid proto type=%u\n", __func__, 1473 xisr->sadb_x_ipsecrequest_proto)); 1474 KEY_FREESP(&newsp); 1475 *error = EPROTONOSUPPORT; 1476 return NULL; 1477 } 1478 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1479 1480 switch (xisr->sadb_x_ipsecrequest_mode) { 1481 case IPSEC_MODE_TRANSPORT: 1482 case IPSEC_MODE_TUNNEL: 1483 break; 1484 case IPSEC_MODE_ANY: 1485 default: 1486 ipseclog((LOG_DEBUG, 1487 "%s: invalid mode=%u\n", __func__, 1488 xisr->sadb_x_ipsecrequest_mode)); 1489 KEY_FREESP(&newsp); 1490 *error = EINVAL; 1491 return NULL; 1492 } 1493 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1494 1495 switch (xisr->sadb_x_ipsecrequest_level) { 1496 case IPSEC_LEVEL_DEFAULT: 1497 case IPSEC_LEVEL_USE: 1498 case IPSEC_LEVEL_REQUIRE: 1499 break; 1500 case IPSEC_LEVEL_UNIQUE: 1501 /* validity check */ 1502 /* 1503 * If range violation of reqid, kernel will 1504 * update it, don't refuse it. 1505 */ 1506 if (xisr->sadb_x_ipsecrequest_reqid 1507 > IPSEC_MANUAL_REQID_MAX) { 1508 ipseclog((LOG_DEBUG, 1509 "%s: reqid=%d range " 1510 "violation, updated by kernel.\n", 1511 __func__, 1512 xisr->sadb_x_ipsecrequest_reqid)); 1513 xisr->sadb_x_ipsecrequest_reqid = 0; 1514 } 1515 1516 /* allocate new reqid id if reqid is zero. */ 1517 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1518 u_int32_t reqid; 1519 if ((reqid = key_newreqid()) == 0) { 1520 KEY_FREESP(&newsp); 1521 *error = ENOBUFS; 1522 return NULL; 1523 } 1524 (*p_isr)->saidx.reqid = reqid; 1525 xisr->sadb_x_ipsecrequest_reqid = reqid; 1526 } else { 1527 /* set it for manual keying. */ 1528 (*p_isr)->saidx.reqid = 1529 xisr->sadb_x_ipsecrequest_reqid; 1530 } 1531 break; 1532 1533 default: 1534 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1535 __func__, 1536 xisr->sadb_x_ipsecrequest_level)); 1537 KEY_FREESP(&newsp); 1538 *error = EINVAL; 1539 return NULL; 1540 } 1541 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1542 1543 /* set IP addresses if there */ 1544 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1545 struct sockaddr *paddr; 1546 1547 paddr = (struct sockaddr *)(xisr + 1); 1548 1549 /* validity check */ 1550 if (paddr->sa_len 1551 > sizeof((*p_isr)->saidx.src)) { 1552 ipseclog((LOG_DEBUG, "%s: invalid " 1553 "request address length.\n", 1554 __func__)); 1555 KEY_FREESP(&newsp); 1556 *error = EINVAL; 1557 return NULL; 1558 } 1559 bcopy(paddr, &(*p_isr)->saidx.src, 1560 paddr->sa_len); 1561 1562 paddr = (struct sockaddr *)((caddr_t)paddr 1563 + paddr->sa_len); 1564 1565 /* validity check */ 1566 if (paddr->sa_len 1567 > sizeof((*p_isr)->saidx.dst)) { 1568 ipseclog((LOG_DEBUG, "%s: invalid " 1569 "request address length.\n", 1570 __func__)); 1571 KEY_FREESP(&newsp); 1572 *error = EINVAL; 1573 return NULL; 1574 } 1575 bcopy(paddr, &(*p_isr)->saidx.dst, 1576 paddr->sa_len); 1577 } 1578 1579 (*p_isr)->sp = newsp; 1580 1581 /* initialization for the next. */ 1582 p_isr = &(*p_isr)->next; 1583 tlen -= xisr->sadb_x_ipsecrequest_len; 1584 1585 /* validity check */ 1586 if (tlen < 0) { 1587 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1588 __func__)); 1589 KEY_FREESP(&newsp); 1590 *error = EINVAL; 1591 return NULL; 1592 } 1593 1594 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1595 + xisr->sadb_x_ipsecrequest_len); 1596 } 1597 } 1598 break; 1599 default: 1600 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1601 KEY_FREESP(&newsp); 1602 *error = EINVAL; 1603 return NULL; 1604 } 1605 1606 *error = 0; 1607 return newsp; 1608} 1609 1610static u_int32_t 1611key_newreqid() 1612{ 1613 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1614 1615 auto_reqid = (auto_reqid == ~0 1616 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1617 1618 /* XXX should be unique check */ 1619 1620 return auto_reqid; 1621} 1622 1623/* 1624 * copy secpolicy struct to sadb_x_policy structure indicated. 1625 */ 1626struct mbuf * 1627key_sp2msg(sp) 1628 struct secpolicy *sp; 1629{ 1630 struct sadb_x_policy *xpl; 1631 int tlen; 1632 caddr_t p; 1633 struct mbuf *m; 1634 1635 IPSEC_ASSERT(sp != NULL, ("null policy")); 1636 1637 tlen = key_getspreqmsglen(sp); 1638 1639 m = key_alloc_mbuf(tlen); 1640 if (!m || m->m_next) { /*XXX*/ 1641 if (m) 1642 m_freem(m); 1643 return NULL; 1644 } 1645 1646 m->m_len = tlen; 1647 m->m_next = NULL; 1648 xpl = mtod(m, struct sadb_x_policy *); 1649 bzero(xpl, tlen); 1650 1651 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1652 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1653 xpl->sadb_x_policy_type = sp->policy; 1654 xpl->sadb_x_policy_dir = sp->spidx.dir; 1655 xpl->sadb_x_policy_id = sp->id; 1656 p = (caddr_t)xpl + sizeof(*xpl); 1657 1658 /* if is the policy for ipsec ? */ 1659 if (sp->policy == IPSEC_POLICY_IPSEC) { 1660 struct sadb_x_ipsecrequest *xisr; 1661 struct ipsecrequest *isr; 1662 1663 for (isr = sp->req; isr != NULL; isr = isr->next) { 1664 1665 xisr = (struct sadb_x_ipsecrequest *)p; 1666 1667 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1668 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1669 xisr->sadb_x_ipsecrequest_level = isr->level; 1670 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1671 1672 p += sizeof(*xisr); 1673 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1674 p += isr->saidx.src.sa.sa_len; 1675 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1676 p += isr->saidx.src.sa.sa_len; 1677 1678 xisr->sadb_x_ipsecrequest_len = 1679 PFKEY_ALIGN8(sizeof(*xisr) 1680 + isr->saidx.src.sa.sa_len 1681 + isr->saidx.dst.sa.sa_len); 1682 } 1683 } 1684 1685 return m; 1686} 1687 1688/* m will not be freed nor modified */ 1689static struct mbuf * 1690#ifdef __STDC__ 1691key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1692 int ndeep, int nitem, ...) 1693#else 1694key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1695 struct mbuf *m; 1696 const struct sadb_msghdr *mhp; 1697 int ndeep; 1698 int nitem; 1699 va_dcl 1700#endif 1701{ 1702 va_list ap; 1703 int idx; 1704 int i; 1705 struct mbuf *result = NULL, *n; 1706 int len; 1707 1708 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1709 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1710 1711 va_start(ap, nitem); 1712 for (i = 0; i < nitem; i++) { 1713 idx = va_arg(ap, int); 1714 if (idx < 0 || idx > SADB_EXT_MAX) 1715 goto fail; 1716 /* don't attempt to pull empty extension */ 1717 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1718 continue; 1719 if (idx != SADB_EXT_RESERVED && 1720 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1721 continue; 1722 1723 if (idx == SADB_EXT_RESERVED) { 1724 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1725 1726 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1727 1728 MGETHDR(n, M_DONTWAIT, MT_DATA); 1729 if (!n) 1730 goto fail; 1731 n->m_len = len; 1732 n->m_next = NULL; 1733 m_copydata(m, 0, sizeof(struct sadb_msg), 1734 mtod(n, caddr_t)); 1735 } else if (i < ndeep) { 1736 len = mhp->extlen[idx]; 1737 n = key_alloc_mbuf(len); 1738 if (!n || n->m_next) { /*XXX*/ 1739 if (n) 1740 m_freem(n); 1741 goto fail; 1742 } 1743 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1744 mtod(n, caddr_t)); 1745 } else { 1746 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1747 M_DONTWAIT); 1748 } 1749 if (n == NULL) 1750 goto fail; 1751 1752 if (result) 1753 m_cat(result, n); 1754 else 1755 result = n; 1756 } 1757 va_end(ap); 1758 1759 if ((result->m_flags & M_PKTHDR) != 0) { 1760 result->m_pkthdr.len = 0; 1761 for (n = result; n; n = n->m_next) 1762 result->m_pkthdr.len += n->m_len; 1763 } 1764 1765 return result; 1766 1767fail: 1768 m_freem(result); 1769 return NULL; 1770} 1771 1772/* 1773 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1774 * add an entry to SP database, when received 1775 * <base, address(SD), (lifetime(H),) policy> 1776 * from the user(?). 1777 * Adding to SP database, 1778 * and send 1779 * <base, address(SD), (lifetime(H),) policy> 1780 * to the socket which was send. 1781 * 1782 * SPDADD set a unique policy entry. 1783 * SPDSETIDX like SPDADD without a part of policy requests. 1784 * SPDUPDATE replace a unique policy entry. 1785 * 1786 * m will always be freed. 1787 */ 1788static int 1789key_spdadd(so, m, mhp) 1790 struct socket *so; 1791 struct mbuf *m; 1792 const struct sadb_msghdr *mhp; 1793{ 1794 struct sadb_address *src0, *dst0; 1795 struct sadb_x_policy *xpl0, *xpl; 1796 struct sadb_lifetime *lft = NULL; 1797 struct secpolicyindex spidx; 1798 struct secpolicy *newsp; 1799 int error; 1800 1801 IPSEC_ASSERT(so != NULL, ("null socket")); 1802 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1803 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1804 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1805 1806 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1807 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1808 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1809 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1810 return key_senderror(so, m, EINVAL); 1811 } 1812 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1813 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1814 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1815 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1816 __func__)); 1817 return key_senderror(so, m, EINVAL); 1818 } 1819 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1820 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1821 < sizeof(struct sadb_lifetime)) { 1822 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1823 __func__)); 1824 return key_senderror(so, m, EINVAL); 1825 } 1826 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1827 } 1828 1829 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1830 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1831 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1832 1833 /* 1834 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1835 * we are processing traffic endpoints. 1836 */ 1837 1838 /* make secindex */ 1839 /* XXX boundary check against sa_len */ 1840 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1841 src0 + 1, 1842 dst0 + 1, 1843 src0->sadb_address_prefixlen, 1844 dst0->sadb_address_prefixlen, 1845 src0->sadb_address_proto, 1846 &spidx); 1847 1848 /* checking the direciton. */ 1849 switch (xpl0->sadb_x_policy_dir) { 1850 case IPSEC_DIR_INBOUND: 1851 case IPSEC_DIR_OUTBOUND: 1852 break; 1853 default: 1854 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1855 mhp->msg->sadb_msg_errno = EINVAL; 1856 return 0; 1857 } 1858 1859 /* check policy */ 1860 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1861 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1862 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1863 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1864 return key_senderror(so, m, EINVAL); 1865 } 1866 1867 /* policy requests are mandatory when action is ipsec. */ 1868 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1869 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1870 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1871 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1872 __func__)); 1873 return key_senderror(so, m, EINVAL); 1874 } 1875 1876 /* 1877 * checking there is SP already or not. 1878 * SPDUPDATE doesn't depend on whether there is a SP or not. 1879 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1880 * then error. 1881 */ 1882 newsp = key_getsp(&spidx); 1883 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1884 if (newsp) { 1885 newsp->state = IPSEC_SPSTATE_DEAD; 1886 KEY_FREESP(&newsp); 1887 } 1888 } else { 1889 if (newsp != NULL) { 1890 KEY_FREESP(&newsp); 1891 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1892 __func__)); 1893 return key_senderror(so, m, EEXIST); 1894 } 1895 } 1896 1897 /* allocation new SP entry */ 1898 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1899 return key_senderror(so, m, error); 1900 } 1901 1902 if ((newsp->id = key_getnewspid()) == 0) { 1903 _key_delsp(newsp); 1904 return key_senderror(so, m, ENOBUFS); 1905 } 1906 1907 /* XXX boundary check against sa_len */ 1908 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1909 src0 + 1, 1910 dst0 + 1, 1911 src0->sadb_address_prefixlen, 1912 dst0->sadb_address_prefixlen, 1913 src0->sadb_address_proto, 1914 &newsp->spidx); 1915 1916 /* sanity check on addr pair */ 1917 if (((struct sockaddr *)(src0 + 1))->sa_family != 1918 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1919 _key_delsp(newsp); 1920 return key_senderror(so, m, EINVAL); 1921 } 1922 if (((struct sockaddr *)(src0 + 1))->sa_len != 1923 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1924 _key_delsp(newsp); 1925 return key_senderror(so, m, EINVAL); 1926 } 1927#if 1 1928 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1929 struct sockaddr *sa; 1930 sa = (struct sockaddr *)(src0 + 1); 1931 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1932 _key_delsp(newsp); 1933 return key_senderror(so, m, EINVAL); 1934 } 1935 } 1936 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1937 struct sockaddr *sa; 1938 sa = (struct sockaddr *)(dst0 + 1); 1939 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1940 _key_delsp(newsp); 1941 return key_senderror(so, m, EINVAL); 1942 } 1943 } 1944#endif 1945 1946 newsp->created = time_second; 1947 newsp->lastused = newsp->created; 1948 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1949 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1950 1951 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1952 newsp->state = IPSEC_SPSTATE_ALIVE; 1953 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1954 1955 /* delete the entry in spacqtree */ 1956 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1957 struct secspacq *spacq = key_getspacq(&spidx); 1958 if (spacq != NULL) { 1959 /* reset counter in order to deletion by timehandler. */ 1960 spacq->created = time_second; 1961 spacq->count = 0; 1962 SPACQ_UNLOCK(); 1963 } 1964 } 1965 1966 { 1967 struct mbuf *n, *mpolicy; 1968 struct sadb_msg *newmsg; 1969 int off; 1970 1971 /* 1972 * Note: do not send SADB_X_EXT_NAT_T_* here: 1973 * we are sending traffic endpoints. 1974 */ 1975 1976 /* create new sadb_msg to reply. */ 1977 if (lft) { 1978 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1979 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1980 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1981 } else { 1982 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1983 SADB_X_EXT_POLICY, 1984 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1985 } 1986 if (!n) 1987 return key_senderror(so, m, ENOBUFS); 1988 1989 if (n->m_len < sizeof(*newmsg)) { 1990 n = m_pullup(n, sizeof(*newmsg)); 1991 if (!n) 1992 return key_senderror(so, m, ENOBUFS); 1993 } 1994 newmsg = mtod(n, struct sadb_msg *); 1995 newmsg->sadb_msg_errno = 0; 1996 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1997 1998 off = 0; 1999 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 2000 sizeof(*xpl), &off); 2001 if (mpolicy == NULL) { 2002 /* n is already freed */ 2003 return key_senderror(so, m, ENOBUFS); 2004 } 2005 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 2006 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 2007 m_freem(n); 2008 return key_senderror(so, m, EINVAL); 2009 } 2010 xpl->sadb_x_policy_id = newsp->id; 2011 2012 m_freem(m); 2013 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2014 } 2015} 2016 2017/* 2018 * get new policy id. 2019 * OUT: 2020 * 0: failure. 2021 * others: success. 2022 */ 2023static u_int32_t 2024key_getnewspid() 2025{ 2026 u_int32_t newid = 0; 2027 int count = V_key_spi_trycnt; /* XXX */ 2028 struct secpolicy *sp; 2029 2030 /* when requesting to allocate spi ranged */ 2031 while (count--) { 2032 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2033 2034 if ((sp = key_getspbyid(newid)) == NULL) 2035 break; 2036 2037 KEY_FREESP(&sp); 2038 } 2039 2040 if (count == 0 || newid == 0) { 2041 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2042 __func__)); 2043 return 0; 2044 } 2045 2046 return newid; 2047} 2048 2049/* 2050 * SADB_SPDDELETE processing 2051 * receive 2052 * <base, address(SD), policy(*)> 2053 * from the user(?), and set SADB_SASTATE_DEAD, 2054 * and send, 2055 * <base, address(SD), policy(*)> 2056 * to the ikmpd. 2057 * policy(*) including direction of policy. 2058 * 2059 * m will always be freed. 2060 */ 2061static int 2062key_spddelete(so, m, mhp) 2063 struct socket *so; 2064 struct mbuf *m; 2065 const struct sadb_msghdr *mhp; 2066{ 2067 struct sadb_address *src0, *dst0; 2068 struct sadb_x_policy *xpl0; 2069 struct secpolicyindex spidx; 2070 struct secpolicy *sp; 2071 2072 IPSEC_ASSERT(so != NULL, ("null so")); 2073 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2074 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2075 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2076 2077 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2078 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2079 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2080 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2081 __func__)); 2082 return key_senderror(so, m, EINVAL); 2083 } 2084 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2085 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2086 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2087 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2088 __func__)); 2089 return key_senderror(so, m, EINVAL); 2090 } 2091 2092 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2093 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2094 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2095 2096 /* 2097 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2098 * we are processing traffic endpoints. 2099 */ 2100 2101 /* make secindex */ 2102 /* XXX boundary check against sa_len */ 2103 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2104 src0 + 1, 2105 dst0 + 1, 2106 src0->sadb_address_prefixlen, 2107 dst0->sadb_address_prefixlen, 2108 src0->sadb_address_proto, 2109 &spidx); 2110 2111 /* checking the direciton. */ 2112 switch (xpl0->sadb_x_policy_dir) { 2113 case IPSEC_DIR_INBOUND: 2114 case IPSEC_DIR_OUTBOUND: 2115 break; 2116 default: 2117 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2118 return key_senderror(so, m, EINVAL); 2119 } 2120 2121 /* Is there SP in SPD ? */ 2122 if ((sp = key_getsp(&spidx)) == NULL) { 2123 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2124 return key_senderror(so, m, EINVAL); 2125 } 2126 2127 /* save policy id to buffer to be returned. */ 2128 xpl0->sadb_x_policy_id = sp->id; 2129 2130 sp->state = IPSEC_SPSTATE_DEAD; 2131 KEY_FREESP(&sp); 2132 2133 { 2134 struct mbuf *n; 2135 struct sadb_msg *newmsg; 2136 2137 /* 2138 * Note: do not send SADB_X_EXT_NAT_T_* here: 2139 * we are sending traffic endpoints. 2140 */ 2141 2142 /* create new sadb_msg to reply. */ 2143 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2144 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2145 if (!n) 2146 return key_senderror(so, m, ENOBUFS); 2147 2148 newmsg = mtod(n, struct sadb_msg *); 2149 newmsg->sadb_msg_errno = 0; 2150 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2151 2152 m_freem(m); 2153 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2154 } 2155} 2156 2157/* 2158 * SADB_SPDDELETE2 processing 2159 * receive 2160 * <base, policy(*)> 2161 * from the user(?), and set SADB_SASTATE_DEAD, 2162 * and send, 2163 * <base, policy(*)> 2164 * to the ikmpd. 2165 * policy(*) including direction of policy. 2166 * 2167 * m will always be freed. 2168 */ 2169static int 2170key_spddelete2(so, m, mhp) 2171 struct socket *so; 2172 struct mbuf *m; 2173 const struct sadb_msghdr *mhp; 2174{ 2175 u_int32_t id; 2176 struct secpolicy *sp; 2177 2178 IPSEC_ASSERT(so != NULL, ("null socket")); 2179 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2180 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2181 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2182 2183 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2184 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2185 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2186 return key_senderror(so, m, EINVAL); 2187 } 2188 2189 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2190 2191 /* Is there SP in SPD ? */ 2192 if ((sp = key_getspbyid(id)) == NULL) { 2193 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2194 return key_senderror(so, m, EINVAL); 2195 } 2196 2197 sp->state = IPSEC_SPSTATE_DEAD; 2198 KEY_FREESP(&sp); 2199 2200 { 2201 struct mbuf *n, *nn; 2202 struct sadb_msg *newmsg; 2203 int off, len; 2204 2205 /* create new sadb_msg to reply. */ 2206 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2207 2208 MGETHDR(n, M_DONTWAIT, MT_DATA); 2209 if (n && len > MHLEN) { 2210 MCLGET(n, M_DONTWAIT); 2211 if ((n->m_flags & M_EXT) == 0) { 2212 m_freem(n); 2213 n = NULL; 2214 } 2215 } 2216 if (!n) 2217 return key_senderror(so, m, ENOBUFS); 2218 2219 n->m_len = len; 2220 n->m_next = NULL; 2221 off = 0; 2222 2223 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2224 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2225 2226 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2227 off, len)); 2228 2229 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2230 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2231 if (!n->m_next) { 2232 m_freem(n); 2233 return key_senderror(so, m, ENOBUFS); 2234 } 2235 2236 n->m_pkthdr.len = 0; 2237 for (nn = n; nn; nn = nn->m_next) 2238 n->m_pkthdr.len += nn->m_len; 2239 2240 newmsg = mtod(n, struct sadb_msg *); 2241 newmsg->sadb_msg_errno = 0; 2242 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2243 2244 m_freem(m); 2245 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2246 } 2247} 2248 2249/* 2250 * SADB_X_GET processing 2251 * receive 2252 * <base, policy(*)> 2253 * from the user(?), 2254 * and send, 2255 * <base, address(SD), policy> 2256 * to the ikmpd. 2257 * policy(*) including direction of policy. 2258 * 2259 * m will always be freed. 2260 */ 2261static int 2262key_spdget(so, m, mhp) 2263 struct socket *so; 2264 struct mbuf *m; 2265 const struct sadb_msghdr *mhp; 2266{ 2267 u_int32_t id; 2268 struct secpolicy *sp; 2269 struct mbuf *n; 2270 2271 IPSEC_ASSERT(so != NULL, ("null socket")); 2272 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2273 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2274 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2275 2276 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2277 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2278 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2279 __func__)); 2280 return key_senderror(so, m, EINVAL); 2281 } 2282 2283 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2284 2285 /* Is there SP in SPD ? */ 2286 if ((sp = key_getspbyid(id)) == NULL) { 2287 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2288 return key_senderror(so, m, ENOENT); 2289 } 2290 2291 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2292 if (n != NULL) { 2293 m_freem(m); 2294 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2295 } else 2296 return key_senderror(so, m, ENOBUFS); 2297} 2298 2299/* 2300 * SADB_X_SPDACQUIRE processing. 2301 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2302 * send 2303 * <base, policy(*)> 2304 * to KMD, and expect to receive 2305 * <base> with SADB_X_SPDACQUIRE if error occured, 2306 * or 2307 * <base, policy> 2308 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2309 * policy(*) is without policy requests. 2310 * 2311 * 0 : succeed 2312 * others: error number 2313 */ 2314int 2315key_spdacquire(sp) 2316 struct secpolicy *sp; 2317{ 2318 struct mbuf *result = NULL, *m; 2319 struct secspacq *newspacq; 2320 2321 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2322 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2323 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2324 ("policy not IPSEC %u", sp->policy)); 2325 2326 /* Get an entry to check whether sent message or not. */ 2327 newspacq = key_getspacq(&sp->spidx); 2328 if (newspacq != NULL) { 2329 if (V_key_blockacq_count < newspacq->count) { 2330 /* reset counter and do send message. */ 2331 newspacq->count = 0; 2332 } else { 2333 /* increment counter and do nothing. */ 2334 newspacq->count++; 2335 return 0; 2336 } 2337 SPACQ_UNLOCK(); 2338 } else { 2339 /* make new entry for blocking to send SADB_ACQUIRE. */ 2340 newspacq = key_newspacq(&sp->spidx); 2341 if (newspacq == NULL) 2342 return ENOBUFS; 2343 } 2344 2345 /* create new sadb_msg to reply. */ 2346 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2347 if (!m) 2348 return ENOBUFS; 2349 2350 result = m; 2351 2352 result->m_pkthdr.len = 0; 2353 for (m = result; m; m = m->m_next) 2354 result->m_pkthdr.len += m->m_len; 2355 2356 mtod(result, struct sadb_msg *)->sadb_msg_len = 2357 PFKEY_UNIT64(result->m_pkthdr.len); 2358 2359 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2360} 2361 2362/* 2363 * SADB_SPDFLUSH processing 2364 * receive 2365 * <base> 2366 * from the user, and free all entries in secpctree. 2367 * and send, 2368 * <base> 2369 * to the user. 2370 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2371 * 2372 * m will always be freed. 2373 */ 2374static int 2375key_spdflush(so, m, mhp) 2376 struct socket *so; 2377 struct mbuf *m; 2378 const struct sadb_msghdr *mhp; 2379{ 2380 struct sadb_msg *newmsg; 2381 struct secpolicy *sp; 2382 u_int dir; 2383 2384 IPSEC_ASSERT(so != NULL, ("null socket")); 2385 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2386 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2387 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2388 2389 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2390 return key_senderror(so, m, EINVAL); 2391 2392 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2393 SPTREE_LOCK(); 2394 LIST_FOREACH(sp, &V_sptree[dir], chain) 2395 sp->state = IPSEC_SPSTATE_DEAD; 2396 SPTREE_UNLOCK(); 2397 } 2398 2399 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2400 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2401 return key_senderror(so, m, ENOBUFS); 2402 } 2403 2404 if (m->m_next) 2405 m_freem(m->m_next); 2406 m->m_next = NULL; 2407 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2408 newmsg = mtod(m, struct sadb_msg *); 2409 newmsg->sadb_msg_errno = 0; 2410 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2411 2412 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2413} 2414 2415/* 2416 * SADB_SPDDUMP processing 2417 * receive 2418 * <base> 2419 * from the user, and dump all SP leaves 2420 * and send, 2421 * <base> ..... 2422 * to the ikmpd. 2423 * 2424 * m will always be freed. 2425 */ 2426static int 2427key_spddump(so, m, mhp) 2428 struct socket *so; 2429 struct mbuf *m; 2430 const struct sadb_msghdr *mhp; 2431{ 2432 struct secpolicy *sp; 2433 int cnt; 2434 u_int dir; 2435 struct mbuf *n; 2436 2437 IPSEC_ASSERT(so != NULL, ("null socket")); 2438 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2439 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2440 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2441 2442 /* search SPD entry and get buffer size. */ 2443 cnt = 0; 2444 SPTREE_LOCK(); 2445 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2446 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2447 cnt++; 2448 } 2449 } 2450 2451 if (cnt == 0) { 2452 SPTREE_UNLOCK(); 2453 return key_senderror(so, m, ENOENT); 2454 } 2455 2456 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2457 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2458 --cnt; 2459 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2460 mhp->msg->sadb_msg_pid); 2461 2462 if (n) 2463 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2464 } 2465 } 2466 2467 SPTREE_UNLOCK(); 2468 m_freem(m); 2469 return 0; 2470} 2471 2472static struct mbuf * 2473key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2474{ 2475 struct mbuf *result = NULL, *m; 2476 struct seclifetime lt; 2477 2478 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2479 if (!m) 2480 goto fail; 2481 result = m; 2482 2483 /* 2484 * Note: do not send SADB_X_EXT_NAT_T_* here: 2485 * we are sending traffic endpoints. 2486 */ 2487 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2488 &sp->spidx.src.sa, sp->spidx.prefs, 2489 sp->spidx.ul_proto); 2490 if (!m) 2491 goto fail; 2492 m_cat(result, m); 2493 2494 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2495 &sp->spidx.dst.sa, sp->spidx.prefd, 2496 sp->spidx.ul_proto); 2497 if (!m) 2498 goto fail; 2499 m_cat(result, m); 2500 2501 m = key_sp2msg(sp); 2502 if (!m) 2503 goto fail; 2504 m_cat(result, m); 2505 2506 if(sp->lifetime){ 2507 lt.addtime=sp->created; 2508 lt.usetime= sp->lastused; 2509 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2510 if (!m) 2511 goto fail; 2512 m_cat(result, m); 2513 2514 lt.addtime=sp->lifetime; 2515 lt.usetime= sp->validtime; 2516 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2517 if (!m) 2518 goto fail; 2519 m_cat(result, m); 2520 } 2521 2522 if ((result->m_flags & M_PKTHDR) == 0) 2523 goto fail; 2524 2525 if (result->m_len < sizeof(struct sadb_msg)) { 2526 result = m_pullup(result, sizeof(struct sadb_msg)); 2527 if (result == NULL) 2528 goto fail; 2529 } 2530 2531 result->m_pkthdr.len = 0; 2532 for (m = result; m; m = m->m_next) 2533 result->m_pkthdr.len += m->m_len; 2534 2535 mtod(result, struct sadb_msg *)->sadb_msg_len = 2536 PFKEY_UNIT64(result->m_pkthdr.len); 2537 2538 return result; 2539 2540fail: 2541 m_freem(result); 2542 return NULL; 2543} 2544 2545/* 2546 * get PFKEY message length for security policy and request. 2547 */ 2548static u_int 2549key_getspreqmsglen(sp) 2550 struct secpolicy *sp; 2551{ 2552 u_int tlen; 2553 2554 tlen = sizeof(struct sadb_x_policy); 2555 2556 /* if is the policy for ipsec ? */ 2557 if (sp->policy != IPSEC_POLICY_IPSEC) 2558 return tlen; 2559 2560 /* get length of ipsec requests */ 2561 { 2562 struct ipsecrequest *isr; 2563 int len; 2564 2565 for (isr = sp->req; isr != NULL; isr = isr->next) { 2566 len = sizeof(struct sadb_x_ipsecrequest) 2567 + isr->saidx.src.sa.sa_len 2568 + isr->saidx.dst.sa.sa_len; 2569 2570 tlen += PFKEY_ALIGN8(len); 2571 } 2572 } 2573 2574 return tlen; 2575} 2576 2577/* 2578 * SADB_SPDEXPIRE processing 2579 * send 2580 * <base, address(SD), lifetime(CH), policy> 2581 * to KMD by PF_KEY. 2582 * 2583 * OUT: 0 : succeed 2584 * others : error number 2585 */ 2586static int 2587key_spdexpire(sp) 2588 struct secpolicy *sp; 2589{ 2590 struct mbuf *result = NULL, *m; 2591 int len; 2592 int error = -1; 2593 struct sadb_lifetime *lt; 2594 2595 /* XXX: Why do we lock ? */ 2596 2597 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2598 2599 /* set msg header */ 2600 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2601 if (!m) { 2602 error = ENOBUFS; 2603 goto fail; 2604 } 2605 result = m; 2606 2607 /* create lifetime extension (current and hard) */ 2608 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2609 m = key_alloc_mbuf(len); 2610 if (!m || m->m_next) { /*XXX*/ 2611 if (m) 2612 m_freem(m); 2613 error = ENOBUFS; 2614 goto fail; 2615 } 2616 bzero(mtod(m, caddr_t), len); 2617 lt = mtod(m, struct sadb_lifetime *); 2618 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2619 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2620 lt->sadb_lifetime_allocations = 0; 2621 lt->sadb_lifetime_bytes = 0; 2622 lt->sadb_lifetime_addtime = sp->created; 2623 lt->sadb_lifetime_usetime = sp->lastused; 2624 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2625 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2626 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2627 lt->sadb_lifetime_allocations = 0; 2628 lt->sadb_lifetime_bytes = 0; 2629 lt->sadb_lifetime_addtime = sp->lifetime; 2630 lt->sadb_lifetime_usetime = sp->validtime; 2631 m_cat(result, m); 2632 2633 /* 2634 * Note: do not send SADB_X_EXT_NAT_T_* here: 2635 * we are sending traffic endpoints. 2636 */ 2637 2638 /* set sadb_address for source */ 2639 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2640 &sp->spidx.src.sa, 2641 sp->spidx.prefs, sp->spidx.ul_proto); 2642 if (!m) { 2643 error = ENOBUFS; 2644 goto fail; 2645 } 2646 m_cat(result, m); 2647 2648 /* set sadb_address for destination */ 2649 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2650 &sp->spidx.dst.sa, 2651 sp->spidx.prefd, sp->spidx.ul_proto); 2652 if (!m) { 2653 error = ENOBUFS; 2654 goto fail; 2655 } 2656 m_cat(result, m); 2657 2658 /* set secpolicy */ 2659 m = key_sp2msg(sp); 2660 if (!m) { 2661 error = ENOBUFS; 2662 goto fail; 2663 } 2664 m_cat(result, m); 2665 2666 if ((result->m_flags & M_PKTHDR) == 0) { 2667 error = EINVAL; 2668 goto fail; 2669 } 2670 2671 if (result->m_len < sizeof(struct sadb_msg)) { 2672 result = m_pullup(result, sizeof(struct sadb_msg)); 2673 if (result == NULL) { 2674 error = ENOBUFS; 2675 goto fail; 2676 } 2677 } 2678 2679 result->m_pkthdr.len = 0; 2680 for (m = result; m; m = m->m_next) 2681 result->m_pkthdr.len += m->m_len; 2682 2683 mtod(result, struct sadb_msg *)->sadb_msg_len = 2684 PFKEY_UNIT64(result->m_pkthdr.len); 2685 2686 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2687 2688 fail: 2689 if (result) 2690 m_freem(result); 2691 return error; 2692} 2693 2694/* %%% SAD management */ 2695/* 2696 * allocating a memory for new SA head, and copy from the values of mhp. 2697 * OUT: NULL : failure due to the lack of memory. 2698 * others : pointer to new SA head. 2699 */ 2700static struct secashead * 2701key_newsah(saidx) 2702 struct secasindex *saidx; 2703{ 2704 struct secashead *newsah; 2705 2706 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2707 2708 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2709 if (newsah != NULL) { 2710 int i; 2711 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2712 LIST_INIT(&newsah->savtree[i]); 2713 newsah->saidx = *saidx; 2714 2715 /* add to saidxtree */ 2716 newsah->state = SADB_SASTATE_MATURE; 2717 2718 SAHTREE_LOCK(); 2719 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2720 SAHTREE_UNLOCK(); 2721 } 2722 return(newsah); 2723} 2724 2725/* 2726 * delete SA index and all SA registerd. 2727 */ 2728static void 2729key_delsah(sah) 2730 struct secashead *sah; 2731{ 2732 struct secasvar *sav, *nextsav; 2733 u_int stateidx; 2734 int zombie = 0; 2735 2736 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2737 SAHTREE_LOCK_ASSERT(); 2738 2739 /* searching all SA registerd in the secindex. */ 2740 for (stateidx = 0; 2741 stateidx < _ARRAYLEN(saorder_state_any); 2742 stateidx++) { 2743 u_int state = saorder_state_any[stateidx]; 2744 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2745 if (sav->refcnt == 0) { 2746 /* sanity check */ 2747 KEY_CHKSASTATE(state, sav->state, __func__); 2748 /* 2749 * do NOT call KEY_FREESAV here: 2750 * it will only delete the sav if refcnt == 1, 2751 * where we already know that refcnt == 0 2752 */ 2753 key_delsav(sav); 2754 } else { 2755 /* give up to delete this sa */ 2756 zombie++; 2757 } 2758 } 2759 } 2760 if (!zombie) { /* delete only if there are savs */ 2761 /* remove from tree of SA index */ 2762 if (__LIST_CHAINED(sah)) 2763 LIST_REMOVE(sah, chain); 2764 if (sah->sa_route.ro_rt) { 2765 RTFREE(sah->sa_route.ro_rt); 2766 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2767 } 2768 free(sah, M_IPSEC_SAH); 2769 } 2770} 2771 2772/* 2773 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2774 * and copy the values of mhp into new buffer. 2775 * When SAD message type is GETSPI: 2776 * to set sequence number from acq_seq++, 2777 * to set zero to SPI. 2778 * not to call key_setsava(). 2779 * OUT: NULL : fail 2780 * others : pointer to new secasvar. 2781 * 2782 * does not modify mbuf. does not free mbuf on error. 2783 */ 2784static struct secasvar * 2785key_newsav(m, mhp, sah, errp, where, tag) 2786 struct mbuf *m; 2787 const struct sadb_msghdr *mhp; 2788 struct secashead *sah; 2789 int *errp; 2790 const char* where; 2791 int tag; 2792{ 2793 struct secasvar *newsav; 2794 const struct sadb_sa *xsa; 2795 2796 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2797 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2798 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2799 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2800 2801 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2802 if (newsav == NULL) { 2803 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2804 *errp = ENOBUFS; 2805 goto done; 2806 } 2807 2808 switch (mhp->msg->sadb_msg_type) { 2809 case SADB_GETSPI: 2810 newsav->spi = 0; 2811 2812#ifdef IPSEC_DOSEQCHECK 2813 /* sync sequence number */ 2814 if (mhp->msg->sadb_msg_seq == 0) 2815 newsav->seq = 2816 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2817 else 2818#endif 2819 newsav->seq = mhp->msg->sadb_msg_seq; 2820 break; 2821 2822 case SADB_ADD: 2823 /* sanity check */ 2824 if (mhp->ext[SADB_EXT_SA] == NULL) { 2825 free(newsav, M_IPSEC_SA); 2826 newsav = NULL; 2827 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2828 __func__)); 2829 *errp = EINVAL; 2830 goto done; 2831 } 2832 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2833 newsav->spi = xsa->sadb_sa_spi; 2834 newsav->seq = mhp->msg->sadb_msg_seq; 2835 break; 2836 default: 2837 free(newsav, M_IPSEC_SA); 2838 newsav = NULL; 2839 *errp = EINVAL; 2840 goto done; 2841 } 2842 2843 2844 /* copy sav values */ 2845 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2846 *errp = key_setsaval(newsav, m, mhp); 2847 if (*errp) { 2848 free(newsav, M_IPSEC_SA); 2849 newsav = NULL; 2850 goto done; 2851 } 2852 } 2853 2854 SECASVAR_LOCK_INIT(newsav); 2855 2856 /* reset created */ 2857 newsav->created = time_second; 2858 newsav->pid = mhp->msg->sadb_msg_pid; 2859 2860 /* add to satree */ 2861 newsav->sah = sah; 2862 sa_initref(newsav); 2863 newsav->state = SADB_SASTATE_LARVAL; 2864 2865 /* XXX locking??? */ 2866 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2867 secasvar, chain); 2868done: 2869 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2870 printf("DP %s from %s:%u return SP:%p\n", __func__, 2871 where, tag, newsav)); 2872 2873 return newsav; 2874} 2875 2876/* 2877 * free() SA variable entry. 2878 */ 2879static void 2880key_cleansav(struct secasvar *sav) 2881{ 2882 /* 2883 * Cleanup xform state. Note that zeroize'ing causes the 2884 * keys to be cleared; otherwise we must do it ourself. 2885 */ 2886 if (sav->tdb_xform != NULL) { 2887 sav->tdb_xform->xf_zeroize(sav); 2888 sav->tdb_xform = NULL; 2889 } else { 2890 KASSERT(sav->iv == NULL, ("iv but no xform")); 2891 if (sav->key_auth != NULL) 2892 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2893 if (sav->key_enc != NULL) 2894 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2895 } 2896 if (sav->key_auth != NULL) { 2897 if (sav->key_auth->key_data != NULL) 2898 free(sav->key_auth->key_data, M_IPSEC_MISC); 2899 free(sav->key_auth, M_IPSEC_MISC); 2900 sav->key_auth = NULL; 2901 } 2902 if (sav->key_enc != NULL) { 2903 if (sav->key_enc->key_data != NULL) 2904 free(sav->key_enc->key_data, M_IPSEC_MISC); 2905 free(sav->key_enc, M_IPSEC_MISC); 2906 sav->key_enc = NULL; 2907 } 2908 if (sav->sched) { 2909 bzero(sav->sched, sav->schedlen); 2910 free(sav->sched, M_IPSEC_MISC); 2911 sav->sched = NULL; 2912 } 2913 if (sav->replay != NULL) { 2914 free(sav->replay, M_IPSEC_MISC); 2915 sav->replay = NULL; 2916 } 2917 if (sav->lft_c != NULL) { 2918 free(sav->lft_c, M_IPSEC_MISC); 2919 sav->lft_c = NULL; 2920 } 2921 if (sav->lft_h != NULL) { 2922 free(sav->lft_h, M_IPSEC_MISC); 2923 sav->lft_h = NULL; 2924 } 2925 if (sav->lft_s != NULL) { 2926 free(sav->lft_s, M_IPSEC_MISC); 2927 sav->lft_s = NULL; 2928 } 2929} 2930 2931/* 2932 * free() SA variable entry. 2933 */ 2934static void 2935key_delsav(sav) 2936 struct secasvar *sav; 2937{ 2938 IPSEC_ASSERT(sav != NULL, ("null sav")); 2939 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2940 2941 /* remove from SA header */ 2942 if (__LIST_CHAINED(sav)) 2943 LIST_REMOVE(sav, chain); 2944 key_cleansav(sav); 2945 SECASVAR_LOCK_DESTROY(sav); 2946 free(sav, M_IPSEC_SA); 2947} 2948 2949/* 2950 * search SAD. 2951 * OUT: 2952 * NULL : not found 2953 * others : found, pointer to a SA. 2954 */ 2955static struct secashead * 2956key_getsah(saidx) 2957 struct secasindex *saidx; 2958{ 2959 struct secashead *sah; 2960 2961 SAHTREE_LOCK(); 2962 LIST_FOREACH(sah, &V_sahtree, chain) { 2963 if (sah->state == SADB_SASTATE_DEAD) 2964 continue; 2965 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2966 break; 2967 } 2968 SAHTREE_UNLOCK(); 2969 2970 return sah; 2971} 2972 2973/* 2974 * check not to be duplicated SPI. 2975 * NOTE: this function is too slow due to searching all SAD. 2976 * OUT: 2977 * NULL : not found 2978 * others : found, pointer to a SA. 2979 */ 2980static struct secasvar * 2981key_checkspidup(saidx, spi) 2982 struct secasindex *saidx; 2983 u_int32_t spi; 2984{ 2985 struct secashead *sah; 2986 struct secasvar *sav; 2987 2988 /* check address family */ 2989 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2990 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2991 __func__)); 2992 return NULL; 2993 } 2994 2995 sav = NULL; 2996 /* check all SAD */ 2997 SAHTREE_LOCK(); 2998 LIST_FOREACH(sah, &V_sahtree, chain) { 2999 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 3000 continue; 3001 sav = key_getsavbyspi(sah, spi); 3002 if (sav != NULL) 3003 break; 3004 } 3005 SAHTREE_UNLOCK(); 3006 3007 return sav; 3008} 3009 3010/* 3011 * search SAD litmited alive SA, protocol, SPI. 3012 * OUT: 3013 * NULL : not found 3014 * others : found, pointer to a SA. 3015 */ 3016static struct secasvar * 3017key_getsavbyspi(sah, spi) 3018 struct secashead *sah; 3019 u_int32_t spi; 3020{ 3021 struct secasvar *sav; 3022 u_int stateidx, state; 3023 3024 sav = NULL; 3025 SAHTREE_LOCK_ASSERT(); 3026 /* search all status */ 3027 for (stateidx = 0; 3028 stateidx < _ARRAYLEN(saorder_state_alive); 3029 stateidx++) { 3030 3031 state = saorder_state_alive[stateidx]; 3032 LIST_FOREACH(sav, &sah->savtree[state], chain) { 3033 3034 /* sanity check */ 3035 if (sav->state != state) { 3036 ipseclog((LOG_DEBUG, "%s: " 3037 "invalid sav->state (queue: %d SA: %d)\n", 3038 __func__, state, sav->state)); 3039 continue; 3040 } 3041 3042 if (sav->spi == spi) 3043 return sav; 3044 } 3045 } 3046 3047 return NULL; 3048} 3049 3050/* 3051 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3052 * You must update these if need. 3053 * OUT: 0: success. 3054 * !0: failure. 3055 * 3056 * does not modify mbuf. does not free mbuf on error. 3057 */ 3058static int 3059key_setsaval(sav, m, mhp) 3060 struct secasvar *sav; 3061 struct mbuf *m; 3062 const struct sadb_msghdr *mhp; 3063{ 3064 int error = 0; 3065 3066 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3067 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3068 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3069 3070 /* initialization */ 3071 sav->replay = NULL; 3072 sav->key_auth = NULL; 3073 sav->key_enc = NULL; 3074 sav->sched = NULL; 3075 sav->schedlen = 0; 3076 sav->iv = NULL; 3077 sav->lft_c = NULL; 3078 sav->lft_h = NULL; 3079 sav->lft_s = NULL; 3080 sav->tdb_xform = NULL; /* transform */ 3081 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3082 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3083 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3084 /* Initialize even if NAT-T not compiled in: */ 3085 sav->natt_type = 0; 3086 sav->natt_esp_frag_len = 0; 3087 3088 /* SA */ 3089 if (mhp->ext[SADB_EXT_SA] != NULL) { 3090 const struct sadb_sa *sa0; 3091 3092 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3093 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3094 error = EINVAL; 3095 goto fail; 3096 } 3097 3098 sav->alg_auth = sa0->sadb_sa_auth; 3099 sav->alg_enc = sa0->sadb_sa_encrypt; 3100 sav->flags = sa0->sadb_sa_flags; 3101 3102 /* replay window */ 3103 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3104 sav->replay = (struct secreplay *) 3105 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3106 if (sav->replay == NULL) { 3107 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3108 __func__)); 3109 error = ENOBUFS; 3110 goto fail; 3111 } 3112 if (sa0->sadb_sa_replay != 0) 3113 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3114 sav->replay->wsize = sa0->sadb_sa_replay; 3115 } 3116 } 3117 3118 /* Authentication keys */ 3119 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3120 const struct sadb_key *key0; 3121 int len; 3122 3123 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3124 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3125 3126 error = 0; 3127 if (len < sizeof(*key0)) { 3128 error = EINVAL; 3129 goto fail; 3130 } 3131 switch (mhp->msg->sadb_msg_satype) { 3132 case SADB_SATYPE_AH: 3133 case SADB_SATYPE_ESP: 3134 case SADB_X_SATYPE_TCPSIGNATURE: 3135 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3136 sav->alg_auth != SADB_X_AALG_NULL) 3137 error = EINVAL; 3138 break; 3139 case SADB_X_SATYPE_IPCOMP: 3140 default: 3141 error = EINVAL; 3142 break; 3143 } 3144 if (error) { 3145 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3146 __func__)); 3147 goto fail; 3148 } 3149 3150 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3151 M_IPSEC_MISC); 3152 if (sav->key_auth == NULL ) { 3153 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3154 __func__)); 3155 error = ENOBUFS; 3156 goto fail; 3157 } 3158 } 3159 3160 /* Encryption key */ 3161 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3162 const struct sadb_key *key0; 3163 int len; 3164 3165 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3166 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3167 3168 error = 0; 3169 if (len < sizeof(*key0)) { 3170 error = EINVAL; 3171 goto fail; 3172 } 3173 switch (mhp->msg->sadb_msg_satype) { 3174 case SADB_SATYPE_ESP: 3175 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3176 sav->alg_enc != SADB_EALG_NULL) { 3177 error = EINVAL; 3178 break; 3179 } 3180 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3181 len, 3182 M_IPSEC_MISC); 3183 if (sav->key_enc == NULL) { 3184 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3185 __func__)); 3186 error = ENOBUFS; 3187 goto fail; 3188 } 3189 break; 3190 case SADB_X_SATYPE_IPCOMP: 3191 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3192 error = EINVAL; 3193 sav->key_enc = NULL; /*just in case*/ 3194 break; 3195 case SADB_SATYPE_AH: 3196 case SADB_X_SATYPE_TCPSIGNATURE: 3197 default: 3198 error = EINVAL; 3199 break; 3200 } 3201 if (error) { 3202 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3203 __func__)); 3204 goto fail; 3205 } 3206 } 3207 3208 /* set iv */ 3209 sav->ivlen = 0; 3210 3211 switch (mhp->msg->sadb_msg_satype) { 3212 case SADB_SATYPE_AH: 3213 error = xform_init(sav, XF_AH); 3214 break; 3215 case SADB_SATYPE_ESP: 3216 error = xform_init(sav, XF_ESP); 3217 break; 3218 case SADB_X_SATYPE_IPCOMP: 3219 error = xform_init(sav, XF_IPCOMP); 3220 break; 3221 case SADB_X_SATYPE_TCPSIGNATURE: 3222 error = xform_init(sav, XF_TCPSIGNATURE); 3223 break; 3224 } 3225 if (error) { 3226 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3227 __func__, mhp->msg->sadb_msg_satype)); 3228 goto fail; 3229 } 3230 3231 /* reset created */ 3232 sav->created = time_second; 3233 3234 /* make lifetime for CURRENT */ 3235 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3236 if (sav->lft_c == NULL) { 3237 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3238 error = ENOBUFS; 3239 goto fail; 3240 } 3241 3242 sav->lft_c->allocations = 0; 3243 sav->lft_c->bytes = 0; 3244 sav->lft_c->addtime = time_second; 3245 sav->lft_c->usetime = 0; 3246 3247 /* lifetimes for HARD and SOFT */ 3248 { 3249 const struct sadb_lifetime *lft0; 3250 3251 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3252 if (lft0 != NULL) { 3253 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3254 error = EINVAL; 3255 goto fail; 3256 } 3257 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3258 if (sav->lft_h == NULL) { 3259 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3260 error = ENOBUFS; 3261 goto fail; 3262 } 3263 /* to be initialize ? */ 3264 } 3265 3266 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3267 if (lft0 != NULL) { 3268 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3269 error = EINVAL; 3270 goto fail; 3271 } 3272 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3273 if (sav->lft_s == NULL) { 3274 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3275 error = ENOBUFS; 3276 goto fail; 3277 } 3278 /* to be initialize ? */ 3279 } 3280 } 3281 3282 return 0; 3283 3284 fail: 3285 /* initialization */ 3286 key_cleansav(sav); 3287 3288 return error; 3289} 3290 3291/* 3292 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3293 * OUT: 0: valid 3294 * other: errno 3295 */ 3296static int 3297key_mature(struct secasvar *sav) 3298{ 3299 int error; 3300 3301 /* check SPI value */ 3302 switch (sav->sah->saidx.proto) { 3303 case IPPROTO_ESP: 3304 case IPPROTO_AH: 3305 /* 3306 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3307 * 1-255 reserved by IANA for future use, 3308 * 0 for implementation specific, local use. 3309 */ 3310 if (ntohl(sav->spi) <= 255) { 3311 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3312 __func__, (u_int32_t)ntohl(sav->spi))); 3313 return EINVAL; 3314 } 3315 break; 3316 } 3317 3318 /* check satype */ 3319 switch (sav->sah->saidx.proto) { 3320 case IPPROTO_ESP: 3321 /* check flags */ 3322 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3323 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3324 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3325 "given to old-esp.\n", __func__)); 3326 return EINVAL; 3327 } 3328 error = xform_init(sav, XF_ESP); 3329 break; 3330 case IPPROTO_AH: 3331 /* check flags */ 3332 if (sav->flags & SADB_X_EXT_DERIV) { 3333 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3334 "given to AH SA.\n", __func__)); 3335 return EINVAL; 3336 } 3337 if (sav->alg_enc != SADB_EALG_NONE) { 3338 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3339 "mismated.\n", __func__)); 3340 return(EINVAL); 3341 } 3342 error = xform_init(sav, XF_AH); 3343 break; 3344 case IPPROTO_IPCOMP: 3345 if (sav->alg_auth != SADB_AALG_NONE) { 3346 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3347 "mismated.\n", __func__)); 3348 return(EINVAL); 3349 } 3350 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3351 && ntohl(sav->spi) >= 0x10000) { 3352 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3353 __func__)); 3354 return(EINVAL); 3355 } 3356 error = xform_init(sav, XF_IPCOMP); 3357 break; 3358 case IPPROTO_TCP: 3359 if (sav->alg_enc != SADB_EALG_NONE) { 3360 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3361 "mismated.\n", __func__)); 3362 return(EINVAL); 3363 } 3364 error = xform_init(sav, XF_TCPSIGNATURE); 3365 break; 3366 default: 3367 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3368 error = EPROTONOSUPPORT; 3369 break; 3370 } 3371 if (error == 0) { 3372 SAHTREE_LOCK(); 3373 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3374 SAHTREE_UNLOCK(); 3375 } 3376 return (error); 3377} 3378 3379/* 3380 * subroutine for SADB_GET and SADB_DUMP. 3381 */ 3382static struct mbuf * 3383key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3384 u_int32_t seq, u_int32_t pid) 3385{ 3386 struct mbuf *result = NULL, *tres = NULL, *m; 3387 int i; 3388 int dumporder[] = { 3389 SADB_EXT_SA, SADB_X_EXT_SA2, 3390 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3391 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3392 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3393 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3394 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3395#ifdef IPSEC_NAT_T 3396 SADB_X_EXT_NAT_T_TYPE, 3397 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3398 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3399 SADB_X_EXT_NAT_T_FRAG, 3400#endif 3401 }; 3402 3403 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3404 if (m == NULL) 3405 goto fail; 3406 result = m; 3407 3408 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3409 m = NULL; 3410 switch (dumporder[i]) { 3411 case SADB_EXT_SA: 3412 m = key_setsadbsa(sav); 3413 if (!m) 3414 goto fail; 3415 break; 3416 3417 case SADB_X_EXT_SA2: 3418 m = key_setsadbxsa2(sav->sah->saidx.mode, 3419 sav->replay ? sav->replay->count : 0, 3420 sav->sah->saidx.reqid); 3421 if (!m) 3422 goto fail; 3423 break; 3424 3425 case SADB_EXT_ADDRESS_SRC: 3426 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3427 &sav->sah->saidx.src.sa, 3428 FULLMASK, IPSEC_ULPROTO_ANY); 3429 if (!m) 3430 goto fail; 3431 break; 3432 3433 case SADB_EXT_ADDRESS_DST: 3434 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3435 &sav->sah->saidx.dst.sa, 3436 FULLMASK, IPSEC_ULPROTO_ANY); 3437 if (!m) 3438 goto fail; 3439 break; 3440 3441 case SADB_EXT_KEY_AUTH: 3442 if (!sav->key_auth) 3443 continue; 3444 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3445 if (!m) 3446 goto fail; 3447 break; 3448 3449 case SADB_EXT_KEY_ENCRYPT: 3450 if (!sav->key_enc) 3451 continue; 3452 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3453 if (!m) 3454 goto fail; 3455 break; 3456 3457 case SADB_EXT_LIFETIME_CURRENT: 3458 if (!sav->lft_c) 3459 continue; 3460 m = key_setlifetime(sav->lft_c, 3461 SADB_EXT_LIFETIME_CURRENT); 3462 if (!m) 3463 goto fail; 3464 break; 3465 3466 case SADB_EXT_LIFETIME_HARD: 3467 if (!sav->lft_h) 3468 continue; 3469 m = key_setlifetime(sav->lft_h, 3470 SADB_EXT_LIFETIME_HARD); 3471 if (!m) 3472 goto fail; 3473 break; 3474 3475 case SADB_EXT_LIFETIME_SOFT: 3476 if (!sav->lft_s) 3477 continue; 3478 m = key_setlifetime(sav->lft_s, 3479 SADB_EXT_LIFETIME_SOFT); 3480 3481 if (!m) 3482 goto fail; 3483 break; 3484 3485#ifdef IPSEC_NAT_T 3486 case SADB_X_EXT_NAT_T_TYPE: 3487 m = key_setsadbxtype(sav->natt_type); 3488 if (!m) 3489 goto fail; 3490 break; 3491 3492 case SADB_X_EXT_NAT_T_DPORT: 3493 m = key_setsadbxport( 3494 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3495 SADB_X_EXT_NAT_T_DPORT); 3496 if (!m) 3497 goto fail; 3498 break; 3499 3500 case SADB_X_EXT_NAT_T_SPORT: 3501 m = key_setsadbxport( 3502 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3503 SADB_X_EXT_NAT_T_SPORT); 3504 if (!m) 3505 goto fail; 3506 break; 3507 3508 case SADB_X_EXT_NAT_T_OAI: 3509 case SADB_X_EXT_NAT_T_OAR: 3510 case SADB_X_EXT_NAT_T_FRAG: 3511 /* We do not (yet) support those. */ 3512 continue; 3513#endif 3514 3515 case SADB_EXT_ADDRESS_PROXY: 3516 case SADB_EXT_IDENTITY_SRC: 3517 case SADB_EXT_IDENTITY_DST: 3518 /* XXX: should we brought from SPD ? */ 3519 case SADB_EXT_SENSITIVITY: 3520 default: 3521 continue; 3522 } 3523 3524 if (!m) 3525 goto fail; 3526 if (tres) 3527 m_cat(m, tres); 3528 tres = m; 3529 3530 } 3531 3532 m_cat(result, tres); 3533 if (result->m_len < sizeof(struct sadb_msg)) { 3534 result = m_pullup(result, sizeof(struct sadb_msg)); 3535 if (result == NULL) 3536 goto fail; 3537 } 3538 3539 result->m_pkthdr.len = 0; 3540 for (m = result; m; m = m->m_next) 3541 result->m_pkthdr.len += m->m_len; 3542 3543 mtod(result, struct sadb_msg *)->sadb_msg_len = 3544 PFKEY_UNIT64(result->m_pkthdr.len); 3545 3546 return result; 3547 3548fail: 3549 m_freem(result); 3550 m_freem(tres); 3551 return NULL; 3552} 3553 3554/* 3555 * set data into sadb_msg. 3556 */ 3557static struct mbuf * 3558key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3559 pid_t pid, u_int16_t reserved) 3560{ 3561 struct mbuf *m; 3562 struct sadb_msg *p; 3563 int len; 3564 3565 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3566 if (len > MCLBYTES) 3567 return NULL; 3568 MGETHDR(m, M_DONTWAIT, MT_DATA); 3569 if (m && len > MHLEN) { 3570 MCLGET(m, M_DONTWAIT); 3571 if ((m->m_flags & M_EXT) == 0) { 3572 m_freem(m); 3573 m = NULL; 3574 } 3575 } 3576 if (!m) 3577 return NULL; 3578 m->m_pkthdr.len = m->m_len = len; 3579 m->m_next = NULL; 3580 3581 p = mtod(m, struct sadb_msg *); 3582 3583 bzero(p, len); 3584 p->sadb_msg_version = PF_KEY_V2; 3585 p->sadb_msg_type = type; 3586 p->sadb_msg_errno = 0; 3587 p->sadb_msg_satype = satype; 3588 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3589 p->sadb_msg_reserved = reserved; 3590 p->sadb_msg_seq = seq; 3591 p->sadb_msg_pid = (u_int32_t)pid; 3592 3593 return m; 3594} 3595 3596/* 3597 * copy secasvar data into sadb_address. 3598 */ 3599static struct mbuf * 3600key_setsadbsa(sav) 3601 struct secasvar *sav; 3602{ 3603 struct mbuf *m; 3604 struct sadb_sa *p; 3605 int len; 3606 3607 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3608 m = key_alloc_mbuf(len); 3609 if (!m || m->m_next) { /*XXX*/ 3610 if (m) 3611 m_freem(m); 3612 return NULL; 3613 } 3614 3615 p = mtod(m, struct sadb_sa *); 3616 3617 bzero(p, len); 3618 p->sadb_sa_len = PFKEY_UNIT64(len); 3619 p->sadb_sa_exttype = SADB_EXT_SA; 3620 p->sadb_sa_spi = sav->spi; 3621 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3622 p->sadb_sa_state = sav->state; 3623 p->sadb_sa_auth = sav->alg_auth; 3624 p->sadb_sa_encrypt = sav->alg_enc; 3625 p->sadb_sa_flags = sav->flags; 3626 3627 return m; 3628} 3629 3630/* 3631 * set data into sadb_address. 3632 */ 3633static struct mbuf * 3634key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3635{ 3636 struct mbuf *m; 3637 struct sadb_address *p; 3638 size_t len; 3639 3640 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3641 PFKEY_ALIGN8(saddr->sa_len); 3642 m = key_alloc_mbuf(len); 3643 if (!m || m->m_next) { /*XXX*/ 3644 if (m) 3645 m_freem(m); 3646 return NULL; 3647 } 3648 3649 p = mtod(m, struct sadb_address *); 3650 3651 bzero(p, len); 3652 p->sadb_address_len = PFKEY_UNIT64(len); 3653 p->sadb_address_exttype = exttype; 3654 p->sadb_address_proto = ul_proto; 3655 if (prefixlen == FULLMASK) { 3656 switch (saddr->sa_family) { 3657 case AF_INET: 3658 prefixlen = sizeof(struct in_addr) << 3; 3659 break; 3660 case AF_INET6: 3661 prefixlen = sizeof(struct in6_addr) << 3; 3662 break; 3663 default: 3664 ; /*XXX*/ 3665 } 3666 } 3667 p->sadb_address_prefixlen = prefixlen; 3668 p->sadb_address_reserved = 0; 3669 3670 bcopy(saddr, 3671 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3672 saddr->sa_len); 3673 3674 return m; 3675} 3676 3677/* 3678 * set data into sadb_x_sa2. 3679 */ 3680static struct mbuf * 3681key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3682{ 3683 struct mbuf *m; 3684 struct sadb_x_sa2 *p; 3685 size_t len; 3686 3687 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3688 m = key_alloc_mbuf(len); 3689 if (!m || m->m_next) { /*XXX*/ 3690 if (m) 3691 m_freem(m); 3692 return NULL; 3693 } 3694 3695 p = mtod(m, struct sadb_x_sa2 *); 3696 3697 bzero(p, len); 3698 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3699 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3700 p->sadb_x_sa2_mode = mode; 3701 p->sadb_x_sa2_reserved1 = 0; 3702 p->sadb_x_sa2_reserved2 = 0; 3703 p->sadb_x_sa2_sequence = seq; 3704 p->sadb_x_sa2_reqid = reqid; 3705 3706 return m; 3707} 3708 3709#ifdef IPSEC_NAT_T 3710/* 3711 * Set a type in sadb_x_nat_t_type. 3712 */ 3713static struct mbuf * 3714key_setsadbxtype(u_int16_t type) 3715{ 3716 struct mbuf *m; 3717 size_t len; 3718 struct sadb_x_nat_t_type *p; 3719 3720 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3721 3722 m = key_alloc_mbuf(len); 3723 if (!m || m->m_next) { /*XXX*/ 3724 if (m) 3725 m_freem(m); 3726 return (NULL); 3727 } 3728 3729 p = mtod(m, struct sadb_x_nat_t_type *); 3730 3731 bzero(p, len); 3732 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3733 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3734 p->sadb_x_nat_t_type_type = type; 3735 3736 return (m); 3737} 3738/* 3739 * Set a port in sadb_x_nat_t_port. 3740 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3741 */ 3742static struct mbuf * 3743key_setsadbxport(u_int16_t port, u_int16_t type) 3744{ 3745 struct mbuf *m; 3746 size_t len; 3747 struct sadb_x_nat_t_port *p; 3748 3749 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3750 3751 m = key_alloc_mbuf(len); 3752 if (!m || m->m_next) { /*XXX*/ 3753 if (m) 3754 m_freem(m); 3755 return (NULL); 3756 } 3757 3758 p = mtod(m, struct sadb_x_nat_t_port *); 3759 3760 bzero(p, len); 3761 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3762 p->sadb_x_nat_t_port_exttype = type; 3763 p->sadb_x_nat_t_port_port = port; 3764 3765 return (m); 3766} 3767 3768/* 3769 * Get port from sockaddr. Port is in network byte order. 3770 */ 3771u_int16_t 3772key_portfromsaddr(struct sockaddr *sa) 3773{ 3774 3775 switch (sa->sa_family) { 3776#ifdef INET 3777 case AF_INET: 3778 return ((struct sockaddr_in *)sa)->sin_port; 3779#endif 3780#ifdef INET6 3781 case AF_INET6: 3782 return ((struct sockaddr_in6 *)sa)->sin6_port; 3783#endif 3784 } 3785 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3786 printf("DP %s unexpected address family %d\n", 3787 __func__, sa->sa_family)); 3788 return (0); 3789} 3790#endif /* IPSEC_NAT_T */ 3791 3792/* 3793 * Set port in struct sockaddr. Port is in network byte order. 3794 */ 3795static void 3796key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3797{ 3798 3799 switch (sa->sa_family) { 3800#ifdef INET 3801 case AF_INET: 3802 ((struct sockaddr_in *)sa)->sin_port = port; 3803 break; 3804#endif 3805#ifdef INET6 3806 case AF_INET6: 3807 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3808 break; 3809#endif 3810 default: 3811 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3812 __func__, sa->sa_family)); 3813 break; 3814 } 3815} 3816 3817/* 3818 * set data into sadb_x_policy 3819 */ 3820static struct mbuf * 3821key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3822{ 3823 struct mbuf *m; 3824 struct sadb_x_policy *p; 3825 size_t len; 3826 3827 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3828 m = key_alloc_mbuf(len); 3829 if (!m || m->m_next) { /*XXX*/ 3830 if (m) 3831 m_freem(m); 3832 return NULL; 3833 } 3834 3835 p = mtod(m, struct sadb_x_policy *); 3836 3837 bzero(p, len); 3838 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3839 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3840 p->sadb_x_policy_type = type; 3841 p->sadb_x_policy_dir = dir; 3842 p->sadb_x_policy_id = id; 3843 3844 return m; 3845} 3846 3847/* %%% utilities */ 3848/* Take a key message (sadb_key) from the socket and turn it into one 3849 * of the kernel's key structures (seckey). 3850 * 3851 * IN: pointer to the src 3852 * OUT: NULL no more memory 3853 */ 3854struct seckey * 3855key_dup_keymsg(const struct sadb_key *src, u_int len, 3856 struct malloc_type *type) 3857{ 3858 struct seckey *dst; 3859 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3860 if (dst != NULL) { 3861 dst->bits = src->sadb_key_bits; 3862 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3863 if (dst->key_data != NULL) { 3864 bcopy((const char *)src + sizeof(struct sadb_key), 3865 dst->key_data, len); 3866 } else { 3867 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3868 __func__)); 3869 free(dst, type); 3870 dst = NULL; 3871 } 3872 } else { 3873 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3874 __func__)); 3875 3876 } 3877 return dst; 3878} 3879 3880/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3881 * turn it into one of the kernel's lifetime structures (seclifetime). 3882 * 3883 * IN: pointer to the destination, source and malloc type 3884 * OUT: NULL, no more memory 3885 */ 3886 3887static struct seclifetime * 3888key_dup_lifemsg(const struct sadb_lifetime *src, 3889 struct malloc_type *type) 3890{ 3891 struct seclifetime *dst = NULL; 3892 3893 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3894 type, M_NOWAIT); 3895 if (dst == NULL) { 3896 /* XXX counter */ 3897 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3898 } else { 3899 dst->allocations = src->sadb_lifetime_allocations; 3900 dst->bytes = src->sadb_lifetime_bytes; 3901 dst->addtime = src->sadb_lifetime_addtime; 3902 dst->usetime = src->sadb_lifetime_usetime; 3903 } 3904 return dst; 3905} 3906 3907/* compare my own address 3908 * OUT: 1: true, i.e. my address. 3909 * 0: false 3910 */ 3911int 3912key_ismyaddr(sa) 3913 struct sockaddr *sa; 3914{ 3915#ifdef INET 3916 struct sockaddr_in *sin; 3917 struct in_ifaddr *ia; 3918#endif 3919 3920 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3921 3922 switch (sa->sa_family) { 3923#ifdef INET 3924 case AF_INET: 3925 sin = (struct sockaddr_in *)sa; 3926 IN_IFADDR_RLOCK(); 3927 for (ia = V_in_ifaddrhead.tqh_first; ia; 3928 ia = ia->ia_link.tqe_next) 3929 { 3930 if (sin->sin_family == ia->ia_addr.sin_family && 3931 sin->sin_len == ia->ia_addr.sin_len && 3932 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3933 { 3934 IN_IFADDR_RUNLOCK(); 3935 return 1; 3936 } 3937 } 3938 IN_IFADDR_RUNLOCK(); 3939 break; 3940#endif 3941#ifdef INET6 3942 case AF_INET6: 3943 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3944#endif 3945 } 3946 3947 return 0; 3948} 3949 3950#ifdef INET6 3951/* 3952 * compare my own address for IPv6. 3953 * 1: ours 3954 * 0: other 3955 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3956 */ 3957#include <netinet6/in6_var.h> 3958 3959static int 3960key_ismyaddr6(sin6) 3961 struct sockaddr_in6 *sin6; 3962{ 3963 struct in6_ifaddr *ia; 3964#if 0 3965 struct in6_multi *in6m; 3966#endif 3967 3968 IN6_IFADDR_RLOCK(); 3969 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3970 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3971 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3972 IN6_IFADDR_RUNLOCK(); 3973 return 1; 3974 } 3975 3976#if 0 3977 /* 3978 * XXX Multicast 3979 * XXX why do we care about multlicast here while we don't care 3980 * about IPv4 multicast?? 3981 * XXX scope 3982 */ 3983 in6m = NULL; 3984 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3985 if (in6m) { 3986 IN6_IFADDR_RUNLOCK(); 3987 return 1; 3988 } 3989#endif 3990 } 3991 IN6_IFADDR_RUNLOCK(); 3992 3993 /* loopback, just for safety */ 3994 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3995 return 1; 3996 3997 return 0; 3998} 3999#endif /*INET6*/ 4000 4001/* 4002 * compare two secasindex structure. 4003 * flag can specify to compare 2 saidxes. 4004 * compare two secasindex structure without both mode and reqid. 4005 * don't compare port. 4006 * IN: 4007 * saidx0: source, it can be in SAD. 4008 * saidx1: object. 4009 * OUT: 4010 * 1 : equal 4011 * 0 : not equal 4012 */ 4013static int 4014key_cmpsaidx( 4015 const struct secasindex *saidx0, 4016 const struct secasindex *saidx1, 4017 int flag) 4018{ 4019 int chkport = 0; 4020 4021 /* sanity */ 4022 if (saidx0 == NULL && saidx1 == NULL) 4023 return 1; 4024 4025 if (saidx0 == NULL || saidx1 == NULL) 4026 return 0; 4027 4028 if (saidx0->proto != saidx1->proto) 4029 return 0; 4030 4031 if (flag == CMP_EXACTLY) { 4032 if (saidx0->mode != saidx1->mode) 4033 return 0; 4034 if (saidx0->reqid != saidx1->reqid) 4035 return 0; 4036 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4037 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4038 return 0; 4039 } else { 4040 4041 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4042 if (flag == CMP_MODE_REQID 4043 ||flag == CMP_REQID) { 4044 /* 4045 * If reqid of SPD is non-zero, unique SA is required. 4046 * The result must be of same reqid in this case. 4047 */ 4048 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4049 return 0; 4050 } 4051 4052 if (flag == CMP_MODE_REQID) { 4053 if (saidx0->mode != IPSEC_MODE_ANY 4054 && saidx0->mode != saidx1->mode) 4055 return 0; 4056 } 4057 4058#ifdef IPSEC_NAT_T 4059 /* 4060 * If NAT-T is enabled, check ports for tunnel mode. 4061 * Do not check ports if they are set to zero in the SPD. 4062 * Also do not do it for transport mode, as there is no 4063 * port information available in the SP. 4064 */ 4065 if (saidx1->mode == IPSEC_MODE_TUNNEL && 4066 saidx1->src.sa.sa_family == AF_INET && 4067 saidx1->dst.sa.sa_family == AF_INET && 4068 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 4069 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 4070 chkport = 1; 4071#endif /* IPSEC_NAT_T */ 4072 4073 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 4074 return 0; 4075 } 4076 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 4077 return 0; 4078 } 4079 } 4080 4081 return 1; 4082} 4083 4084/* 4085 * compare two secindex structure exactly. 4086 * IN: 4087 * spidx0: source, it is often in SPD. 4088 * spidx1: object, it is often from PFKEY message. 4089 * OUT: 4090 * 1 : equal 4091 * 0 : not equal 4092 */ 4093static int 4094key_cmpspidx_exactly( 4095 struct secpolicyindex *spidx0, 4096 struct secpolicyindex *spidx1) 4097{ 4098 /* sanity */ 4099 if (spidx0 == NULL && spidx1 == NULL) 4100 return 1; 4101 4102 if (spidx0 == NULL || spidx1 == NULL) 4103 return 0; 4104 4105 if (spidx0->prefs != spidx1->prefs 4106 || spidx0->prefd != spidx1->prefd 4107 || spidx0->ul_proto != spidx1->ul_proto) 4108 return 0; 4109 4110 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4111 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4112} 4113 4114/* 4115 * compare two secindex structure with mask. 4116 * IN: 4117 * spidx0: source, it is often in SPD. 4118 * spidx1: object, it is often from IP header. 4119 * OUT: 4120 * 1 : equal 4121 * 0 : not equal 4122 */ 4123static int 4124key_cmpspidx_withmask( 4125 struct secpolicyindex *spidx0, 4126 struct secpolicyindex *spidx1) 4127{ 4128 /* sanity */ 4129 if (spidx0 == NULL && spidx1 == NULL) 4130 return 1; 4131 4132 if (spidx0 == NULL || spidx1 == NULL) 4133 return 0; 4134 4135 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4136 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4137 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4138 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4139 return 0; 4140 4141 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4142 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4143 && spidx0->ul_proto != spidx1->ul_proto) 4144 return 0; 4145 4146 switch (spidx0->src.sa.sa_family) { 4147 case AF_INET: 4148 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4149 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4150 return 0; 4151 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4152 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4153 return 0; 4154 break; 4155 case AF_INET6: 4156 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4157 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4158 return 0; 4159 /* 4160 * scope_id check. if sin6_scope_id is 0, we regard it 4161 * as a wildcard scope, which matches any scope zone ID. 4162 */ 4163 if (spidx0->src.sin6.sin6_scope_id && 4164 spidx1->src.sin6.sin6_scope_id && 4165 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4166 return 0; 4167 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4168 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4169 return 0; 4170 break; 4171 default: 4172 /* XXX */ 4173 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4174 return 0; 4175 break; 4176 } 4177 4178 switch (spidx0->dst.sa.sa_family) { 4179 case AF_INET: 4180 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4181 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4182 return 0; 4183 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4184 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4185 return 0; 4186 break; 4187 case AF_INET6: 4188 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4189 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4190 return 0; 4191 /* 4192 * scope_id check. if sin6_scope_id is 0, we regard it 4193 * as a wildcard scope, which matches any scope zone ID. 4194 */ 4195 if (spidx0->dst.sin6.sin6_scope_id && 4196 spidx1->dst.sin6.sin6_scope_id && 4197 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4198 return 0; 4199 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4200 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4201 return 0; 4202 break; 4203 default: 4204 /* XXX */ 4205 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4206 return 0; 4207 break; 4208 } 4209 4210 /* XXX Do we check other field ? e.g. flowinfo */ 4211 4212 return 1; 4213} 4214 4215/* returns 0 on match */ 4216static int 4217key_sockaddrcmp( 4218 const struct sockaddr *sa1, 4219 const struct sockaddr *sa2, 4220 int port) 4221{ 4222#ifdef satosin 4223#undef satosin 4224#endif 4225#define satosin(s) ((const struct sockaddr_in *)s) 4226#ifdef satosin6 4227#undef satosin6 4228#endif 4229#define satosin6(s) ((const struct sockaddr_in6 *)s) 4230 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4231 return 1; 4232 4233 switch (sa1->sa_family) { 4234 case AF_INET: 4235 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4236 return 1; 4237 if (satosin(sa1)->sin_addr.s_addr != 4238 satosin(sa2)->sin_addr.s_addr) { 4239 return 1; 4240 } 4241 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4242 return 1; 4243 break; 4244 case AF_INET6: 4245 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4246 return 1; /*EINVAL*/ 4247 if (satosin6(sa1)->sin6_scope_id != 4248 satosin6(sa2)->sin6_scope_id) { 4249 return 1; 4250 } 4251 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4252 &satosin6(sa2)->sin6_addr)) { 4253 return 1; 4254 } 4255 if (port && 4256 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4257 return 1; 4258 } 4259 break; 4260 default: 4261 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4262 return 1; 4263 break; 4264 } 4265 4266 return 0; 4267#undef satosin 4268#undef satosin6 4269} 4270 4271/* 4272 * compare two buffers with mask. 4273 * IN: 4274 * addr1: source 4275 * addr2: object 4276 * bits: Number of bits to compare 4277 * OUT: 4278 * 1 : equal 4279 * 0 : not equal 4280 */ 4281static int 4282key_bbcmp(const void *a1, const void *a2, u_int bits) 4283{ 4284 const unsigned char *p1 = a1; 4285 const unsigned char *p2 = a2; 4286 4287 /* XXX: This could be considerably faster if we compare a word 4288 * at a time, but it is complicated on LSB Endian machines */ 4289 4290 /* Handle null pointers */ 4291 if (p1 == NULL || p2 == NULL) 4292 return (p1 == p2); 4293 4294 while (bits >= 8) { 4295 if (*p1++ != *p2++) 4296 return 0; 4297 bits -= 8; 4298 } 4299 4300 if (bits > 0) { 4301 u_int8_t mask = ~((1<<(8-bits))-1); 4302 if ((*p1 & mask) != (*p2 & mask)) 4303 return 0; 4304 } 4305 return 1; /* Match! */ 4306} 4307 4308static void 4309key_flush_spd(time_t now) 4310{ 4311 static u_int16_t sptree_scangen = 0; 4312 u_int16_t gen = sptree_scangen++; 4313 struct secpolicy *sp; 4314 u_int dir; 4315 4316 /* SPD */ 4317 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4318restart: 4319 SPTREE_LOCK(); 4320 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4321 if (sp->scangen == gen) /* previously handled */ 4322 continue; 4323 sp->scangen = gen; 4324 if (sp->state == IPSEC_SPSTATE_DEAD && 4325 sp->refcnt == 1) { 4326 /* 4327 * Ensure that we only decrease refcnt once, 4328 * when we're the last consumer. 4329 * Directly call SP_DELREF/key_delsp instead 4330 * of KEY_FREESP to avoid unlocking/relocking 4331 * SPTREE_LOCK before key_delsp: may refcnt 4332 * be increased again during that time ? 4333 * NB: also clean entries created by 4334 * key_spdflush 4335 */ 4336 SP_DELREF(sp); 4337 key_delsp(sp); 4338 SPTREE_UNLOCK(); 4339 goto restart; 4340 } 4341 if (sp->lifetime == 0 && sp->validtime == 0) 4342 continue; 4343 if ((sp->lifetime && now - sp->created > sp->lifetime) 4344 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4345 sp->state = IPSEC_SPSTATE_DEAD; 4346 SPTREE_UNLOCK(); 4347 key_spdexpire(sp); 4348 goto restart; 4349 } 4350 } 4351 SPTREE_UNLOCK(); 4352 } 4353} 4354 4355static void 4356key_flush_sad(time_t now) 4357{ 4358 struct secashead *sah, *nextsah; 4359 struct secasvar *sav, *nextsav; 4360 4361 /* SAD */ 4362 SAHTREE_LOCK(); 4363 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4364 /* if sah has been dead, then delete it and process next sah. */ 4365 if (sah->state == SADB_SASTATE_DEAD) { 4366 key_delsah(sah); 4367 continue; 4368 } 4369 4370 /* if LARVAL entry doesn't become MATURE, delete it. */ 4371 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4372 /* Need to also check refcnt for a larval SA ??? */ 4373 if (now - sav->created > V_key_larval_lifetime) 4374 KEY_FREESAV(&sav); 4375 } 4376 4377 /* 4378 * check MATURE entry to start to send expire message 4379 * whether or not. 4380 */ 4381 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4382 /* we don't need to check. */ 4383 if (sav->lft_s == NULL) 4384 continue; 4385 4386 /* sanity check */ 4387 if (sav->lft_c == NULL) { 4388 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4389 "time, why?\n", __func__)); 4390 continue; 4391 } 4392 4393 /* check SOFT lifetime */ 4394 if (sav->lft_s->addtime != 0 && 4395 now - sav->created > sav->lft_s->addtime) { 4396 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4397 /* 4398 * Actually, only send expire message if 4399 * SA has been used, as it was done before, 4400 * but should we always send such message, 4401 * and let IKE daemon decide if it should be 4402 * renegotiated or not ? 4403 * XXX expire message will actually NOT be 4404 * sent if SA is only used after soft 4405 * lifetime has been reached, see below 4406 * (DYING state) 4407 */ 4408 if (sav->lft_c->usetime != 0) 4409 key_expire(sav); 4410 } 4411 /* check SOFT lifetime by bytes */ 4412 /* 4413 * XXX I don't know the way to delete this SA 4414 * when new SA is installed. Caution when it's 4415 * installed too big lifetime by time. 4416 */ 4417 else if (sav->lft_s->bytes != 0 && 4418 sav->lft_s->bytes < sav->lft_c->bytes) { 4419 4420 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4421 /* 4422 * XXX If we keep to send expire 4423 * message in the status of 4424 * DYING. Do remove below code. 4425 */ 4426 key_expire(sav); 4427 } 4428 } 4429 4430 /* check DYING entry to change status to DEAD. */ 4431 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4432 /* we don't need to check. */ 4433 if (sav->lft_h == NULL) 4434 continue; 4435 4436 /* sanity check */ 4437 if (sav->lft_c == NULL) { 4438 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4439 "time, why?\n", __func__)); 4440 continue; 4441 } 4442 4443 if (sav->lft_h->addtime != 0 && 4444 now - sav->created > sav->lft_h->addtime) { 4445 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4446 KEY_FREESAV(&sav); 4447 } 4448#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4449 else if (sav->lft_s != NULL 4450 && sav->lft_s->addtime != 0 4451 && now - sav->created > sav->lft_s->addtime) { 4452 /* 4453 * XXX: should be checked to be 4454 * installed the valid SA. 4455 */ 4456 4457 /* 4458 * If there is no SA then sending 4459 * expire message. 4460 */ 4461 key_expire(sav); 4462 } 4463#endif 4464 /* check HARD lifetime by bytes */ 4465 else if (sav->lft_h->bytes != 0 && 4466 sav->lft_h->bytes < sav->lft_c->bytes) { 4467 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4468 KEY_FREESAV(&sav); 4469 } 4470 } 4471 4472 /* delete entry in DEAD */ 4473 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4474 /* sanity check */ 4475 if (sav->state != SADB_SASTATE_DEAD) { 4476 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4477 "(queue: %d SA: %d): kill it anyway\n", 4478 __func__, 4479 SADB_SASTATE_DEAD, sav->state)); 4480 } 4481 /* 4482 * do not call key_freesav() here. 4483 * sav should already be freed, and sav->refcnt 4484 * shows other references to sav 4485 * (such as from SPD). 4486 */ 4487 } 4488 } 4489 SAHTREE_UNLOCK(); 4490} 4491 4492static void 4493key_flush_acq(time_t now) 4494{ 4495 struct secacq *acq, *nextacq; 4496 4497 /* ACQ tree */ 4498 ACQ_LOCK(); 4499 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4500 nextacq = LIST_NEXT(acq, chain); 4501 if (now - acq->created > V_key_blockacq_lifetime 4502 && __LIST_CHAINED(acq)) { 4503 LIST_REMOVE(acq, chain); 4504 free(acq, M_IPSEC_SAQ); 4505 } 4506 } 4507 ACQ_UNLOCK(); 4508} 4509 4510static void 4511key_flush_spacq(time_t now) 4512{ 4513 struct secspacq *acq, *nextacq; 4514 4515 /* SP ACQ tree */ 4516 SPACQ_LOCK(); 4517 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4518 nextacq = LIST_NEXT(acq, chain); 4519 if (now - acq->created > V_key_blockacq_lifetime 4520 && __LIST_CHAINED(acq)) { 4521 LIST_REMOVE(acq, chain); 4522 free(acq, M_IPSEC_SAQ); 4523 } 4524 } 4525 SPACQ_UNLOCK(); 4526} 4527 4528/* 4529 * time handler. 4530 * scanning SPD and SAD to check status for each entries, 4531 * and do to remove or to expire. 4532 * XXX: year 2038 problem may remain. 4533 */ 4534void 4535key_timehandler(void) 4536{ 4537 VNET_ITERATOR_DECL(vnet_iter); 4538 time_t now = time_second; 4539 4540 VNET_LIST_RLOCK(); 4541 VNET_FOREACH(vnet_iter) { 4542 CURVNET_SET(vnet_iter); 4543 key_flush_spd(now); 4544 key_flush_sad(now); 4545 key_flush_acq(now); 4546 key_flush_spacq(now); 4547 CURVNET_RESTORE(); 4548 } 4549 VNET_LIST_RUNLOCK(); 4550 4551#ifndef IPSEC_DEBUG2 4552 /* do exchange to tick time !! */ 4553 (void)timeout((void *)key_timehandler, (void *)0, hz); 4554#endif /* IPSEC_DEBUG2 */ 4555} 4556 4557u_long 4558key_random() 4559{ 4560 u_long value; 4561 4562 key_randomfill(&value, sizeof(value)); 4563 return value; 4564} 4565 4566void 4567key_randomfill(p, l) 4568 void *p; 4569 size_t l; 4570{ 4571 size_t n; 4572 u_long v; 4573 static int warn = 1; 4574 4575 n = 0; 4576 n = (size_t)read_random(p, (u_int)l); 4577 /* last resort */ 4578 while (n < l) { 4579 v = random(); 4580 bcopy(&v, (u_int8_t *)p + n, 4581 l - n < sizeof(v) ? l - n : sizeof(v)); 4582 n += sizeof(v); 4583 4584 if (warn) { 4585 printf("WARNING: pseudo-random number generator " 4586 "used for IPsec processing\n"); 4587 warn = 0; 4588 } 4589 } 4590} 4591 4592/* 4593 * map SADB_SATYPE_* to IPPROTO_*. 4594 * if satype == SADB_SATYPE then satype is mapped to ~0. 4595 * OUT: 4596 * 0: invalid satype. 4597 */ 4598static u_int16_t 4599key_satype2proto(u_int8_t satype) 4600{ 4601 switch (satype) { 4602 case SADB_SATYPE_UNSPEC: 4603 return IPSEC_PROTO_ANY; 4604 case SADB_SATYPE_AH: 4605 return IPPROTO_AH; 4606 case SADB_SATYPE_ESP: 4607 return IPPROTO_ESP; 4608 case SADB_X_SATYPE_IPCOMP: 4609 return IPPROTO_IPCOMP; 4610 case SADB_X_SATYPE_TCPSIGNATURE: 4611 return IPPROTO_TCP; 4612 default: 4613 return 0; 4614 } 4615 /* NOTREACHED */ 4616} 4617 4618/* 4619 * map IPPROTO_* to SADB_SATYPE_* 4620 * OUT: 4621 * 0: invalid protocol type. 4622 */ 4623static u_int8_t 4624key_proto2satype(u_int16_t proto) 4625{ 4626 switch (proto) { 4627 case IPPROTO_AH: 4628 return SADB_SATYPE_AH; 4629 case IPPROTO_ESP: 4630 return SADB_SATYPE_ESP; 4631 case IPPROTO_IPCOMP: 4632 return SADB_X_SATYPE_IPCOMP; 4633 case IPPROTO_TCP: 4634 return SADB_X_SATYPE_TCPSIGNATURE; 4635 default: 4636 return 0; 4637 } 4638 /* NOTREACHED */ 4639} 4640 4641/* %%% PF_KEY */ 4642/* 4643 * SADB_GETSPI processing is to receive 4644 * <base, (SA2), src address, dst address, (SPI range)> 4645 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4646 * tree with the status of LARVAL, and send 4647 * <base, SA(*), address(SD)> 4648 * to the IKMPd. 4649 * 4650 * IN: mhp: pointer to the pointer to each header. 4651 * OUT: NULL if fail. 4652 * other if success, return pointer to the message to send. 4653 */ 4654static int 4655key_getspi(so, m, mhp) 4656 struct socket *so; 4657 struct mbuf *m; 4658 const struct sadb_msghdr *mhp; 4659{ 4660 struct sadb_address *src0, *dst0; 4661 struct secasindex saidx; 4662 struct secashead *newsah; 4663 struct secasvar *newsav; 4664 u_int8_t proto; 4665 u_int32_t spi; 4666 u_int8_t mode; 4667 u_int32_t reqid; 4668 int error; 4669 4670 IPSEC_ASSERT(so != NULL, ("null socket")); 4671 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4672 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4673 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4674 4675 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4676 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4677 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4678 __func__)); 4679 return key_senderror(so, m, EINVAL); 4680 } 4681 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4682 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4683 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4684 __func__)); 4685 return key_senderror(so, m, EINVAL); 4686 } 4687 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4688 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4689 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4690 } else { 4691 mode = IPSEC_MODE_ANY; 4692 reqid = 0; 4693 } 4694 4695 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4696 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4697 4698 /* map satype to proto */ 4699 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4700 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4701 __func__)); 4702 return key_senderror(so, m, EINVAL); 4703 } 4704 4705 /* 4706 * Make sure the port numbers are zero. 4707 * In case of NAT-T we will update them later if needed. 4708 */ 4709 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4710 case AF_INET: 4711 if (((struct sockaddr *)(src0 + 1))->sa_len != 4712 sizeof(struct sockaddr_in)) 4713 return key_senderror(so, m, EINVAL); 4714 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4715 break; 4716 case AF_INET6: 4717 if (((struct sockaddr *)(src0 + 1))->sa_len != 4718 sizeof(struct sockaddr_in6)) 4719 return key_senderror(so, m, EINVAL); 4720 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4721 break; 4722 default: 4723 ; /*???*/ 4724 } 4725 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4726 case AF_INET: 4727 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4728 sizeof(struct sockaddr_in)) 4729 return key_senderror(so, m, EINVAL); 4730 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4731 break; 4732 case AF_INET6: 4733 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4734 sizeof(struct sockaddr_in6)) 4735 return key_senderror(so, m, EINVAL); 4736 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4737 break; 4738 default: 4739 ; /*???*/ 4740 } 4741 4742 /* XXX boundary check against sa_len */ 4743 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4744 4745#ifdef IPSEC_NAT_T 4746 /* 4747 * Handle NAT-T info if present. 4748 * We made sure the port numbers are zero above, so we do 4749 * not have to worry in case we do not update them. 4750 */ 4751 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4752 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4753 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4754 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4755 4756 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4757 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4758 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4759 struct sadb_x_nat_t_type *type; 4760 struct sadb_x_nat_t_port *sport, *dport; 4761 4762 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4763 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4764 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4765 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4766 "passed.\n", __func__)); 4767 return key_senderror(so, m, EINVAL); 4768 } 4769 4770 sport = (struct sadb_x_nat_t_port *) 4771 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4772 dport = (struct sadb_x_nat_t_port *) 4773 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4774 4775 if (sport) 4776 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4777 if (dport) 4778 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4779 } 4780#endif 4781 4782 /* SPI allocation */ 4783 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4784 &saidx); 4785 if (spi == 0) 4786 return key_senderror(so, m, EINVAL); 4787 4788 /* get a SA index */ 4789 if ((newsah = key_getsah(&saidx)) == NULL) { 4790 /* create a new SA index */ 4791 if ((newsah = key_newsah(&saidx)) == NULL) { 4792 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4793 return key_senderror(so, m, ENOBUFS); 4794 } 4795 } 4796 4797 /* get a new SA */ 4798 /* XXX rewrite */ 4799 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4800 if (newsav == NULL) { 4801 /* XXX don't free new SA index allocated in above. */ 4802 return key_senderror(so, m, error); 4803 } 4804 4805 /* set spi */ 4806 newsav->spi = htonl(spi); 4807 4808 /* delete the entry in acqtree */ 4809 if (mhp->msg->sadb_msg_seq != 0) { 4810 struct secacq *acq; 4811 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4812 /* reset counter in order to deletion by timehandler. */ 4813 acq->created = time_second; 4814 acq->count = 0; 4815 } 4816 } 4817 4818 { 4819 struct mbuf *n, *nn; 4820 struct sadb_sa *m_sa; 4821 struct sadb_msg *newmsg; 4822 int off, len; 4823 4824 /* create new sadb_msg to reply. */ 4825 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4826 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4827 4828 MGETHDR(n, M_DONTWAIT, MT_DATA); 4829 if (len > MHLEN) { 4830 MCLGET(n, M_DONTWAIT); 4831 if ((n->m_flags & M_EXT) == 0) { 4832 m_freem(n); 4833 n = NULL; 4834 } 4835 } 4836 if (!n) 4837 return key_senderror(so, m, ENOBUFS); 4838 4839 n->m_len = len; 4840 n->m_next = NULL; 4841 off = 0; 4842 4843 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4844 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4845 4846 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4847 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4848 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4849 m_sa->sadb_sa_spi = htonl(spi); 4850 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4851 4852 IPSEC_ASSERT(off == len, 4853 ("length inconsistency (off %u len %u)", off, len)); 4854 4855 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4856 SADB_EXT_ADDRESS_DST); 4857 if (!n->m_next) { 4858 m_freem(n); 4859 return key_senderror(so, m, ENOBUFS); 4860 } 4861 4862 if (n->m_len < sizeof(struct sadb_msg)) { 4863 n = m_pullup(n, sizeof(struct sadb_msg)); 4864 if (n == NULL) 4865 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4866 } 4867 4868 n->m_pkthdr.len = 0; 4869 for (nn = n; nn; nn = nn->m_next) 4870 n->m_pkthdr.len += nn->m_len; 4871 4872 newmsg = mtod(n, struct sadb_msg *); 4873 newmsg->sadb_msg_seq = newsav->seq; 4874 newmsg->sadb_msg_errno = 0; 4875 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4876 4877 m_freem(m); 4878 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4879 } 4880} 4881 4882/* 4883 * allocating new SPI 4884 * called by key_getspi(). 4885 * OUT: 4886 * 0: failure. 4887 * others: success. 4888 */ 4889static u_int32_t 4890key_do_getnewspi(spirange, saidx) 4891 struct sadb_spirange *spirange; 4892 struct secasindex *saidx; 4893{ 4894 u_int32_t newspi; 4895 u_int32_t min, max; 4896 int count = V_key_spi_trycnt; 4897 4898 /* set spi range to allocate */ 4899 if (spirange != NULL) { 4900 min = spirange->sadb_spirange_min; 4901 max = spirange->sadb_spirange_max; 4902 } else { 4903 min = V_key_spi_minval; 4904 max = V_key_spi_maxval; 4905 } 4906 /* IPCOMP needs 2-byte SPI */ 4907 if (saidx->proto == IPPROTO_IPCOMP) { 4908 u_int32_t t; 4909 if (min >= 0x10000) 4910 min = 0xffff; 4911 if (max >= 0x10000) 4912 max = 0xffff; 4913 if (min > max) { 4914 t = min; min = max; max = t; 4915 } 4916 } 4917 4918 if (min == max) { 4919 if (key_checkspidup(saidx, min) != NULL) { 4920 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4921 __func__, min)); 4922 return 0; 4923 } 4924 4925 count--; /* taking one cost. */ 4926 newspi = min; 4927 4928 } else { 4929 4930 /* init SPI */ 4931 newspi = 0; 4932 4933 /* when requesting to allocate spi ranged */ 4934 while (count--) { 4935 /* generate pseudo-random SPI value ranged. */ 4936 newspi = min + (key_random() % (max - min + 1)); 4937 4938 if (key_checkspidup(saidx, newspi) == NULL) 4939 break; 4940 } 4941 4942 if (count == 0 || newspi == 0) { 4943 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4944 __func__)); 4945 return 0; 4946 } 4947 } 4948 4949 /* statistics */ 4950 keystat.getspi_count = 4951 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4952 4953 return newspi; 4954} 4955 4956/* 4957 * SADB_UPDATE processing 4958 * receive 4959 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4960 * key(AE), (identity(SD),) (sensitivity)> 4961 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4962 * and send 4963 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4964 * (identity(SD),) (sensitivity)> 4965 * to the ikmpd. 4966 * 4967 * m will always be freed. 4968 */ 4969static int 4970key_update(so, m, mhp) 4971 struct socket *so; 4972 struct mbuf *m; 4973 const struct sadb_msghdr *mhp; 4974{ 4975 struct sadb_sa *sa0; 4976 struct sadb_address *src0, *dst0; 4977#ifdef IPSEC_NAT_T 4978 struct sadb_x_nat_t_type *type; 4979 struct sadb_x_nat_t_port *sport, *dport; 4980 struct sadb_address *iaddr, *raddr; 4981 struct sadb_x_nat_t_frag *frag; 4982#endif 4983 struct secasindex saidx; 4984 struct secashead *sah; 4985 struct secasvar *sav; 4986 u_int16_t proto; 4987 u_int8_t mode; 4988 u_int32_t reqid; 4989 int error; 4990 4991 IPSEC_ASSERT(so != NULL, ("null socket")); 4992 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4993 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4994 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4995 4996 /* map satype to proto */ 4997 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4998 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4999 __func__)); 5000 return key_senderror(so, m, EINVAL); 5001 } 5002 5003 if (mhp->ext[SADB_EXT_SA] == NULL || 5004 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5005 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5006 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5007 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5008 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5009 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5010 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5011 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5012 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5013 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5014 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5015 __func__)); 5016 return key_senderror(so, m, EINVAL); 5017 } 5018 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5019 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5020 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5021 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5022 __func__)); 5023 return key_senderror(so, m, EINVAL); 5024 } 5025 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5026 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5027 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5028 } else { 5029 mode = IPSEC_MODE_ANY; 5030 reqid = 0; 5031 } 5032 /* XXX boundary checking for other extensions */ 5033 5034 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5035 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5036 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5037 5038 /* XXX boundary check against sa_len */ 5039 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5040 5041 /* 5042 * Make sure the port numbers are zero. 5043 * In case of NAT-T we will update them later if needed. 5044 */ 5045 KEY_PORTTOSADDR(&saidx.src, 0); 5046 KEY_PORTTOSADDR(&saidx.dst, 0); 5047 5048#ifdef IPSEC_NAT_T 5049 /* 5050 * Handle NAT-T info if present. 5051 */ 5052 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5053 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5054 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5055 5056 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5057 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5058 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5059 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5060 __func__)); 5061 return key_senderror(so, m, EINVAL); 5062 } 5063 5064 type = (struct sadb_x_nat_t_type *) 5065 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5066 sport = (struct sadb_x_nat_t_port *) 5067 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5068 dport = (struct sadb_x_nat_t_port *) 5069 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5070 } else { 5071 type = 0; 5072 sport = dport = 0; 5073 } 5074 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5075 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5076 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5077 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5078 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5079 __func__)); 5080 return key_senderror(so, m, EINVAL); 5081 } 5082 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5083 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5084 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5085 } else { 5086 iaddr = raddr = NULL; 5087 } 5088 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5089 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5090 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5091 __func__)); 5092 return key_senderror(so, m, EINVAL); 5093 } 5094 frag = (struct sadb_x_nat_t_frag *) 5095 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5096 } else { 5097 frag = 0; 5098 } 5099#endif 5100 5101 /* get a SA header */ 5102 if ((sah = key_getsah(&saidx)) == NULL) { 5103 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5104 return key_senderror(so, m, ENOENT); 5105 } 5106 5107 /* set spidx if there */ 5108 /* XXX rewrite */ 5109 error = key_setident(sah, m, mhp); 5110 if (error) 5111 return key_senderror(so, m, error); 5112 5113 /* find a SA with sequence number. */ 5114#ifdef IPSEC_DOSEQCHECK 5115 if (mhp->msg->sadb_msg_seq != 0 5116 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5117 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5118 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5119 return key_senderror(so, m, ENOENT); 5120 } 5121#else 5122 SAHTREE_LOCK(); 5123 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5124 SAHTREE_UNLOCK(); 5125 if (sav == NULL) { 5126 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5127 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5128 return key_senderror(so, m, EINVAL); 5129 } 5130#endif 5131 5132 /* validity check */ 5133 if (sav->sah->saidx.proto != proto) { 5134 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5135 "(DB=%u param=%u)\n", __func__, 5136 sav->sah->saidx.proto, proto)); 5137 return key_senderror(so, m, EINVAL); 5138 } 5139#ifdef IPSEC_DOSEQCHECK 5140 if (sav->spi != sa0->sadb_sa_spi) { 5141 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5142 __func__, 5143 (u_int32_t)ntohl(sav->spi), 5144 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5145 return key_senderror(so, m, EINVAL); 5146 } 5147#endif 5148 if (sav->pid != mhp->msg->sadb_msg_pid) { 5149 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5150 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5151 return key_senderror(so, m, EINVAL); 5152 } 5153 5154 /* copy sav values */ 5155 error = key_setsaval(sav, m, mhp); 5156 if (error) { 5157 KEY_FREESAV(&sav); 5158 return key_senderror(so, m, error); 5159 } 5160 5161 /* check SA values to be mature. */ 5162 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5163 KEY_FREESAV(&sav); 5164 return key_senderror(so, m, 0); 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 { 5194 struct mbuf *n; 5195 5196 /* set msg buf from mhp */ 5197 n = key_getmsgbuf_x1(m, mhp); 5198 if (n == NULL) { 5199 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5200 return key_senderror(so, m, ENOBUFS); 5201 } 5202 5203 m_freem(m); 5204 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5205 } 5206} 5207 5208/* 5209 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5210 * only called by key_update(). 5211 * OUT: 5212 * NULL : not found 5213 * others : found, pointer to a SA. 5214 */ 5215#ifdef IPSEC_DOSEQCHECK 5216static struct secasvar * 5217key_getsavbyseq(sah, seq) 5218 struct secashead *sah; 5219 u_int32_t seq; 5220{ 5221 struct secasvar *sav; 5222 u_int state; 5223 5224 state = SADB_SASTATE_LARVAL; 5225 5226 /* search SAD with sequence number ? */ 5227 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5228 5229 KEY_CHKSASTATE(state, sav->state, __func__); 5230 5231 if (sav->seq == seq) { 5232 sa_addref(sav); 5233 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5234 printf("DP %s cause refcnt++:%d SA:%p\n", 5235 __func__, sav->refcnt, sav)); 5236 return sav; 5237 } 5238 } 5239 5240 return NULL; 5241} 5242#endif 5243 5244/* 5245 * SADB_ADD processing 5246 * add an entry to SA database, when received 5247 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5248 * key(AE), (identity(SD),) (sensitivity)> 5249 * from the ikmpd, 5250 * and send 5251 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5252 * (identity(SD),) (sensitivity)> 5253 * to the ikmpd. 5254 * 5255 * IGNORE identity and sensitivity messages. 5256 * 5257 * m will always be freed. 5258 */ 5259static int 5260key_add(so, m, mhp) 5261 struct socket *so; 5262 struct mbuf *m; 5263 const struct sadb_msghdr *mhp; 5264{ 5265 struct sadb_sa *sa0; 5266 struct sadb_address *src0, *dst0; 5267#ifdef IPSEC_NAT_T 5268 struct sadb_x_nat_t_type *type; 5269 struct sadb_address *iaddr, *raddr; 5270 struct sadb_x_nat_t_frag *frag; 5271#endif 5272 struct secasindex saidx; 5273 struct secashead *newsah; 5274 struct secasvar *newsav; 5275 u_int16_t proto; 5276 u_int8_t mode; 5277 u_int32_t reqid; 5278 int error; 5279 5280 IPSEC_ASSERT(so != NULL, ("null socket")); 5281 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5282 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5283 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5284 5285 /* map satype to proto */ 5286 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5287 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5288 __func__)); 5289 return key_senderror(so, m, EINVAL); 5290 } 5291 5292 if (mhp->ext[SADB_EXT_SA] == NULL || 5293 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5294 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5295 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5296 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5297 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5298 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5299 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5300 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5301 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5302 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5303 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5304 __func__)); 5305 return key_senderror(so, m, EINVAL); 5306 } 5307 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5308 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5309 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5310 /* XXX need more */ 5311 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5312 __func__)); 5313 return key_senderror(so, m, EINVAL); 5314 } 5315 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5316 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5317 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5318 } else { 5319 mode = IPSEC_MODE_ANY; 5320 reqid = 0; 5321 } 5322 5323 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5324 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5325 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5326 5327 /* XXX boundary check against sa_len */ 5328 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5329 5330 /* 5331 * Make sure the port numbers are zero. 5332 * In case of NAT-T we will update them later if needed. 5333 */ 5334 KEY_PORTTOSADDR(&saidx.src, 0); 5335 KEY_PORTTOSADDR(&saidx.dst, 0); 5336 5337#ifdef IPSEC_NAT_T 5338 /* 5339 * Handle NAT-T info if present. 5340 */ 5341 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5342 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5343 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5344 struct sadb_x_nat_t_port *sport, *dport; 5345 5346 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5347 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5348 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5349 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5350 __func__)); 5351 return key_senderror(so, m, EINVAL); 5352 } 5353 5354 type = (struct sadb_x_nat_t_type *) 5355 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5356 sport = (struct sadb_x_nat_t_port *) 5357 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5358 dport = (struct sadb_x_nat_t_port *) 5359 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5360 5361 if (sport) 5362 KEY_PORTTOSADDR(&saidx.src, 5363 sport->sadb_x_nat_t_port_port); 5364 if (dport) 5365 KEY_PORTTOSADDR(&saidx.dst, 5366 dport->sadb_x_nat_t_port_port); 5367 } else { 5368 type = 0; 5369 } 5370 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5371 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5372 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5373 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5374 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5375 __func__)); 5376 return key_senderror(so, m, EINVAL); 5377 } 5378 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5379 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5380 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5381 } else { 5382 iaddr = raddr = NULL; 5383 } 5384 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5385 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5386 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5387 __func__)); 5388 return key_senderror(so, m, EINVAL); 5389 } 5390 frag = (struct sadb_x_nat_t_frag *) 5391 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5392 } else { 5393 frag = 0; 5394 } 5395#endif 5396 5397 /* get a SA header */ 5398 if ((newsah = key_getsah(&saidx)) == NULL) { 5399 /* create a new SA header */ 5400 if ((newsah = key_newsah(&saidx)) == NULL) { 5401 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5402 return key_senderror(so, m, ENOBUFS); 5403 } 5404 } 5405 5406 /* set spidx if there */ 5407 /* XXX rewrite */ 5408 error = key_setident(newsah, m, mhp); 5409 if (error) { 5410 return key_senderror(so, m, error); 5411 } 5412 5413 /* create new SA entry. */ 5414 /* We can create new SA only if SPI is differenct. */ 5415 SAHTREE_LOCK(); 5416 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5417 SAHTREE_UNLOCK(); 5418 if (newsav != NULL) { 5419 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5420 return key_senderror(so, m, EEXIST); 5421 } 5422 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5423 if (newsav == NULL) { 5424 return key_senderror(so, m, error); 5425 } 5426 5427 /* check SA values to be mature. */ 5428 if ((error = key_mature(newsav)) != 0) { 5429 KEY_FREESAV(&newsav); 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 /* 5453 * don't call key_freesav() here, as we would like to keep the SA 5454 * in the database on success. 5455 */ 5456 5457 { 5458 struct mbuf *n; 5459 5460 /* set msg buf from mhp */ 5461 n = key_getmsgbuf_x1(m, mhp); 5462 if (n == NULL) { 5463 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5464 return key_senderror(so, m, ENOBUFS); 5465 } 5466 5467 m_freem(m); 5468 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5469 } 5470} 5471 5472/* m is retained */ 5473static int 5474key_setident(sah, m, mhp) 5475 struct secashead *sah; 5476 struct mbuf *m; 5477 const struct sadb_msghdr *mhp; 5478{ 5479 const struct sadb_ident *idsrc, *iddst; 5480 int idsrclen, iddstlen; 5481 5482 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5483 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5484 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5485 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5486 5487 /* don't make buffer if not there */ 5488 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5489 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5490 sah->idents = NULL; 5491 sah->identd = NULL; 5492 return 0; 5493 } 5494 5495 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5496 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5497 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5498 return EINVAL; 5499 } 5500 5501 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5502 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5503 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5504 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5505 5506 /* validity check */ 5507 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5508 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5509 return EINVAL; 5510 } 5511 5512 switch (idsrc->sadb_ident_type) { 5513 case SADB_IDENTTYPE_PREFIX: 5514 case SADB_IDENTTYPE_FQDN: 5515 case SADB_IDENTTYPE_USERFQDN: 5516 default: 5517 /* XXX do nothing */ 5518 sah->idents = NULL; 5519 sah->identd = NULL; 5520 return 0; 5521 } 5522 5523 /* make structure */ 5524 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5525 if (sah->idents == NULL) { 5526 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5527 return ENOBUFS; 5528 } 5529 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5530 if (sah->identd == NULL) { 5531 free(sah->idents, M_IPSEC_MISC); 5532 sah->idents = NULL; 5533 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5534 return ENOBUFS; 5535 } 5536 sah->idents->type = idsrc->sadb_ident_type; 5537 sah->idents->id = idsrc->sadb_ident_id; 5538 5539 sah->identd->type = iddst->sadb_ident_type; 5540 sah->identd->id = iddst->sadb_ident_id; 5541 5542 return 0; 5543} 5544 5545/* 5546 * m will not be freed on return. 5547 * it is caller's responsibility to free the result. 5548 */ 5549static struct mbuf * 5550key_getmsgbuf_x1(m, mhp) 5551 struct mbuf *m; 5552 const struct sadb_msghdr *mhp; 5553{ 5554 struct mbuf *n; 5555 5556 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5557 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5558 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5559 5560 /* create new sadb_msg to reply. */ 5561 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5562 SADB_EXT_SA, SADB_X_EXT_SA2, 5563 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5564 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5565 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5566 if (!n) 5567 return NULL; 5568 5569 if (n->m_len < sizeof(struct sadb_msg)) { 5570 n = m_pullup(n, sizeof(struct sadb_msg)); 5571 if (n == NULL) 5572 return NULL; 5573 } 5574 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5575 mtod(n, struct sadb_msg *)->sadb_msg_len = 5576 PFKEY_UNIT64(n->m_pkthdr.len); 5577 5578 return n; 5579} 5580 5581static int key_delete_all __P((struct socket *, struct mbuf *, 5582 const struct sadb_msghdr *, u_int16_t)); 5583 5584/* 5585 * SADB_DELETE processing 5586 * receive 5587 * <base, SA(*), address(SD)> 5588 * from the ikmpd, and set SADB_SASTATE_DEAD, 5589 * and send, 5590 * <base, SA(*), address(SD)> 5591 * to the ikmpd. 5592 * 5593 * m will always be freed. 5594 */ 5595static int 5596key_delete(so, m, mhp) 5597 struct socket *so; 5598 struct mbuf *m; 5599 const struct sadb_msghdr *mhp; 5600{ 5601 struct sadb_sa *sa0; 5602 struct sadb_address *src0, *dst0; 5603 struct secasindex saidx; 5604 struct secashead *sah; 5605 struct secasvar *sav = NULL; 5606 u_int16_t proto; 5607 5608 IPSEC_ASSERT(so != NULL, ("null socket")); 5609 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5610 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5611 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5612 5613 /* map satype to proto */ 5614 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5615 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5616 __func__)); 5617 return key_senderror(so, m, EINVAL); 5618 } 5619 5620 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5621 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5622 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5623 __func__)); 5624 return key_senderror(so, m, EINVAL); 5625 } 5626 5627 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5628 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5629 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5630 __func__)); 5631 return key_senderror(so, m, EINVAL); 5632 } 5633 5634 if (mhp->ext[SADB_EXT_SA] == NULL) { 5635 /* 5636 * Caller wants us to delete all non-LARVAL SAs 5637 * that match the src/dst. This is used during 5638 * IKE INITIAL-CONTACT. 5639 */ 5640 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5641 return key_delete_all(so, m, mhp, proto); 5642 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5643 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5644 __func__)); 5645 return key_senderror(so, m, EINVAL); 5646 } 5647 5648 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5649 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5650 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5651 5652 /* XXX boundary check against sa_len */ 5653 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5654 5655 /* 5656 * Make sure the port numbers are zero. 5657 * In case of NAT-T we will update them later if needed. 5658 */ 5659 KEY_PORTTOSADDR(&saidx.src, 0); 5660 KEY_PORTTOSADDR(&saidx.dst, 0); 5661 5662#ifdef IPSEC_NAT_T 5663 /* 5664 * Handle NAT-T info if present. 5665 */ 5666 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5667 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5668 struct sadb_x_nat_t_port *sport, *dport; 5669 5670 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5671 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5672 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5673 __func__)); 5674 return key_senderror(so, m, EINVAL); 5675 } 5676 5677 sport = (struct sadb_x_nat_t_port *) 5678 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5679 dport = (struct sadb_x_nat_t_port *) 5680 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5681 5682 if (sport) 5683 KEY_PORTTOSADDR(&saidx.src, 5684 sport->sadb_x_nat_t_port_port); 5685 if (dport) 5686 KEY_PORTTOSADDR(&saidx.dst, 5687 dport->sadb_x_nat_t_port_port); 5688 } 5689#endif 5690 5691 /* get a SA header */ 5692 SAHTREE_LOCK(); 5693 LIST_FOREACH(sah, &V_sahtree, chain) { 5694 if (sah->state == SADB_SASTATE_DEAD) 5695 continue; 5696 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5697 continue; 5698 5699 /* get a SA with SPI. */ 5700 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5701 if (sav) 5702 break; 5703 } 5704 if (sah == NULL) { 5705 SAHTREE_UNLOCK(); 5706 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5707 return key_senderror(so, m, ENOENT); 5708 } 5709 5710 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5711 SAHTREE_UNLOCK(); 5712 KEY_FREESAV(&sav); 5713 5714 { 5715 struct mbuf *n; 5716 struct sadb_msg *newmsg; 5717 5718 /* create new sadb_msg to reply. */ 5719 /* XXX-BZ NAT-T extensions? */ 5720 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5721 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5722 if (!n) 5723 return key_senderror(so, m, ENOBUFS); 5724 5725 if (n->m_len < sizeof(struct sadb_msg)) { 5726 n = m_pullup(n, sizeof(struct sadb_msg)); 5727 if (n == NULL) 5728 return key_senderror(so, m, ENOBUFS); 5729 } 5730 newmsg = mtod(n, struct sadb_msg *); 5731 newmsg->sadb_msg_errno = 0; 5732 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5733 5734 m_freem(m); 5735 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5736 } 5737} 5738 5739/* 5740 * delete all SAs for src/dst. Called from key_delete(). 5741 */ 5742static int 5743key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5744 u_int16_t proto) 5745{ 5746 struct sadb_address *src0, *dst0; 5747 struct secasindex saidx; 5748 struct secashead *sah; 5749 struct secasvar *sav, *nextsav; 5750 u_int stateidx, state; 5751 5752 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5753 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5754 5755 /* XXX boundary check against sa_len */ 5756 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5757 5758 /* 5759 * Make sure the port numbers are zero. 5760 * In case of NAT-T we will update them later if needed. 5761 */ 5762 KEY_PORTTOSADDR(&saidx.src, 0); 5763 KEY_PORTTOSADDR(&saidx.dst, 0); 5764 5765#ifdef IPSEC_NAT_T 5766 /* 5767 * Handle NAT-T info if present. 5768 */ 5769 5770 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5771 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5772 struct sadb_x_nat_t_port *sport, *dport; 5773 5774 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5775 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5776 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5777 __func__)); 5778 return key_senderror(so, m, EINVAL); 5779 } 5780 5781 sport = (struct sadb_x_nat_t_port *) 5782 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5783 dport = (struct sadb_x_nat_t_port *) 5784 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5785 5786 if (sport) 5787 KEY_PORTTOSADDR(&saidx.src, 5788 sport->sadb_x_nat_t_port_port); 5789 if (dport) 5790 KEY_PORTTOSADDR(&saidx.dst, 5791 dport->sadb_x_nat_t_port_port); 5792 } 5793#endif 5794 5795 SAHTREE_LOCK(); 5796 LIST_FOREACH(sah, &V_sahtree, chain) { 5797 if (sah->state == SADB_SASTATE_DEAD) 5798 continue; 5799 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5800 continue; 5801 5802 /* Delete all non-LARVAL SAs. */ 5803 for (stateidx = 0; 5804 stateidx < _ARRAYLEN(saorder_state_alive); 5805 stateidx++) { 5806 state = saorder_state_alive[stateidx]; 5807 if (state == SADB_SASTATE_LARVAL) 5808 continue; 5809 for (sav = LIST_FIRST(&sah->savtree[state]); 5810 sav != NULL; sav = nextsav) { 5811 nextsav = LIST_NEXT(sav, chain); 5812 /* sanity check */ 5813 if (sav->state != state) { 5814 ipseclog((LOG_DEBUG, "%s: invalid " 5815 "sav->state (queue %d SA %d)\n", 5816 __func__, state, sav->state)); 5817 continue; 5818 } 5819 5820 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5821 KEY_FREESAV(&sav); 5822 } 5823 } 5824 } 5825 SAHTREE_UNLOCK(); 5826 { 5827 struct mbuf *n; 5828 struct sadb_msg *newmsg; 5829 5830 /* create new sadb_msg to reply. */ 5831 /* XXX-BZ NAT-T extensions? */ 5832 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5833 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5834 if (!n) 5835 return key_senderror(so, m, ENOBUFS); 5836 5837 if (n->m_len < sizeof(struct sadb_msg)) { 5838 n = m_pullup(n, sizeof(struct sadb_msg)); 5839 if (n == NULL) 5840 return key_senderror(so, m, ENOBUFS); 5841 } 5842 newmsg = mtod(n, struct sadb_msg *); 5843 newmsg->sadb_msg_errno = 0; 5844 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5845 5846 m_freem(m); 5847 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5848 } 5849} 5850 5851/* 5852 * SADB_GET processing 5853 * receive 5854 * <base, SA(*), address(SD)> 5855 * from the ikmpd, and get a SP and a SA to respond, 5856 * and send, 5857 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5858 * (identity(SD),) (sensitivity)> 5859 * to the ikmpd. 5860 * 5861 * m will always be freed. 5862 */ 5863static int 5864key_get(so, m, mhp) 5865 struct socket *so; 5866 struct mbuf *m; 5867 const struct sadb_msghdr *mhp; 5868{ 5869 struct sadb_sa *sa0; 5870 struct sadb_address *src0, *dst0; 5871 struct secasindex saidx; 5872 struct secashead *sah; 5873 struct secasvar *sav = NULL; 5874 u_int16_t proto; 5875 5876 IPSEC_ASSERT(so != NULL, ("null socket")); 5877 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5878 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5879 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5880 5881 /* map satype to proto */ 5882 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5883 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5884 __func__)); 5885 return key_senderror(so, m, EINVAL); 5886 } 5887 5888 if (mhp->ext[SADB_EXT_SA] == NULL || 5889 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5890 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5891 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5892 __func__)); 5893 return key_senderror(so, m, EINVAL); 5894 } 5895 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5896 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5897 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5898 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5899 __func__)); 5900 return key_senderror(so, m, EINVAL); 5901 } 5902 5903 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5904 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5905 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5906 5907 /* XXX boundary check against sa_len */ 5908 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5909 5910 /* 5911 * Make sure the port numbers are zero. 5912 * In case of NAT-T we will update them later if needed. 5913 */ 5914 KEY_PORTTOSADDR(&saidx.src, 0); 5915 KEY_PORTTOSADDR(&saidx.dst, 0); 5916 5917#ifdef IPSEC_NAT_T 5918 /* 5919 * Handle NAT-T info if present. 5920 */ 5921 5922 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5923 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5924 struct sadb_x_nat_t_port *sport, *dport; 5925 5926 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5927 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5928 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5929 __func__)); 5930 return key_senderror(so, m, EINVAL); 5931 } 5932 5933 sport = (struct sadb_x_nat_t_port *) 5934 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5935 dport = (struct sadb_x_nat_t_port *) 5936 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5937 5938 if (sport) 5939 KEY_PORTTOSADDR(&saidx.src, 5940 sport->sadb_x_nat_t_port_port); 5941 if (dport) 5942 KEY_PORTTOSADDR(&saidx.dst, 5943 dport->sadb_x_nat_t_port_port); 5944 } 5945#endif 5946 5947 /* get a SA header */ 5948 SAHTREE_LOCK(); 5949 LIST_FOREACH(sah, &V_sahtree, chain) { 5950 if (sah->state == SADB_SASTATE_DEAD) 5951 continue; 5952 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5953 continue; 5954 5955 /* get a SA with SPI. */ 5956 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5957 if (sav) 5958 break; 5959 } 5960 SAHTREE_UNLOCK(); 5961 if (sah == NULL) { 5962 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5963 return key_senderror(so, m, ENOENT); 5964 } 5965 5966 { 5967 struct mbuf *n; 5968 u_int8_t satype; 5969 5970 /* map proto to satype */ 5971 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5972 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5973 __func__)); 5974 return key_senderror(so, m, EINVAL); 5975 } 5976 5977 /* create new sadb_msg to reply. */ 5978 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5979 mhp->msg->sadb_msg_pid); 5980 if (!n) 5981 return key_senderror(so, m, ENOBUFS); 5982 5983 m_freem(m); 5984 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5985 } 5986} 5987 5988/* XXX make it sysctl-configurable? */ 5989static void 5990key_getcomb_setlifetime(comb) 5991 struct sadb_comb *comb; 5992{ 5993 5994 comb->sadb_comb_soft_allocations = 1; 5995 comb->sadb_comb_hard_allocations = 1; 5996 comb->sadb_comb_soft_bytes = 0; 5997 comb->sadb_comb_hard_bytes = 0; 5998 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5999 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 6000 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 6001 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 6002} 6003 6004/* 6005 * XXX reorder combinations by preference 6006 * XXX no idea if the user wants ESP authentication or not 6007 */ 6008static struct mbuf * 6009key_getcomb_esp() 6010{ 6011 struct sadb_comb *comb; 6012 struct enc_xform *algo; 6013 struct mbuf *result = NULL, *m, *n; 6014 int encmin; 6015 int i, off, o; 6016 int totlen; 6017 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6018 6019 m = NULL; 6020 for (i = 1; i <= SADB_EALG_MAX; i++) { 6021 algo = esp_algorithm_lookup(i); 6022 if (algo == NULL) 6023 continue; 6024 6025 /* discard algorithms with key size smaller than system min */ 6026 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 6027 continue; 6028 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 6029 encmin = V_ipsec_esp_keymin; 6030 else 6031 encmin = _BITS(algo->minkey); 6032 6033 if (V_ipsec_esp_auth) 6034 m = key_getcomb_ah(); 6035 else { 6036 IPSEC_ASSERT(l <= MLEN, 6037 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6038 MGET(m, M_DONTWAIT, MT_DATA); 6039 if (m) { 6040 M_ALIGN(m, l); 6041 m->m_len = l; 6042 m->m_next = NULL; 6043 bzero(mtod(m, caddr_t), m->m_len); 6044 } 6045 } 6046 if (!m) 6047 goto fail; 6048 6049 totlen = 0; 6050 for (n = m; n; n = n->m_next) 6051 totlen += n->m_len; 6052 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 6053 6054 for (off = 0; off < totlen; off += l) { 6055 n = m_pulldown(m, off, l, &o); 6056 if (!n) { 6057 /* m is already freed */ 6058 goto fail; 6059 } 6060 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 6061 bzero(comb, sizeof(*comb)); 6062 key_getcomb_setlifetime(comb); 6063 comb->sadb_comb_encrypt = i; 6064 comb->sadb_comb_encrypt_minbits = encmin; 6065 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 6066 } 6067 6068 if (!result) 6069 result = m; 6070 else 6071 m_cat(result, m); 6072 } 6073 6074 return result; 6075 6076 fail: 6077 if (result) 6078 m_freem(result); 6079 return NULL; 6080} 6081 6082static void 6083key_getsizes_ah( 6084 const struct auth_hash *ah, 6085 int alg, 6086 u_int16_t* min, 6087 u_int16_t* max) 6088{ 6089 6090 *min = *max = ah->keysize; 6091 if (ah->keysize == 0) { 6092 /* 6093 * Transform takes arbitrary key size but algorithm 6094 * key size is restricted. Enforce this here. 6095 */ 6096 switch (alg) { 6097 case SADB_X_AALG_MD5: *min = *max = 16; break; 6098 case SADB_X_AALG_SHA: *min = *max = 20; break; 6099 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 6100 default: 6101 DPRINTF(("%s: unknown AH algorithm %u\n", 6102 __func__, alg)); 6103 break; 6104 } 6105 } 6106} 6107 6108/* 6109 * XXX reorder combinations by preference 6110 */ 6111static struct mbuf * 6112key_getcomb_ah() 6113{ 6114 struct sadb_comb *comb; 6115 struct auth_hash *algo; 6116 struct mbuf *m; 6117 u_int16_t minkeysize, maxkeysize; 6118 int i; 6119 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6120 6121 m = NULL; 6122 for (i = 1; i <= SADB_AALG_MAX; i++) { 6123#if 1 6124 /* we prefer HMAC algorithms, not old algorithms */ 6125 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 6126 continue; 6127#endif 6128 algo = ah_algorithm_lookup(i); 6129 if (!algo) 6130 continue; 6131 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6132 /* discard algorithms with key size smaller than system min */ 6133 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6134 continue; 6135 6136 if (!m) { 6137 IPSEC_ASSERT(l <= MLEN, 6138 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6139 MGET(m, M_DONTWAIT, MT_DATA); 6140 if (m) { 6141 M_ALIGN(m, l); 6142 m->m_len = l; 6143 m->m_next = NULL; 6144 } 6145 } else 6146 M_PREPEND(m, l, M_DONTWAIT); 6147 if (!m) 6148 return NULL; 6149 6150 comb = mtod(m, struct sadb_comb *); 6151 bzero(comb, sizeof(*comb)); 6152 key_getcomb_setlifetime(comb); 6153 comb->sadb_comb_auth = i; 6154 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6155 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6156 } 6157 6158 return m; 6159} 6160 6161/* 6162 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6163 * XXX reorder combinations by preference 6164 */ 6165static struct mbuf * 6166key_getcomb_ipcomp() 6167{ 6168 struct sadb_comb *comb; 6169 struct comp_algo *algo; 6170 struct mbuf *m; 6171 int i; 6172 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6173 6174 m = NULL; 6175 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6176 algo = ipcomp_algorithm_lookup(i); 6177 if (!algo) 6178 continue; 6179 6180 if (!m) { 6181 IPSEC_ASSERT(l <= MLEN, 6182 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6183 MGET(m, M_DONTWAIT, MT_DATA); 6184 if (m) { 6185 M_ALIGN(m, l); 6186 m->m_len = l; 6187 m->m_next = NULL; 6188 } 6189 } else 6190 M_PREPEND(m, l, M_DONTWAIT); 6191 if (!m) 6192 return NULL; 6193 6194 comb = mtod(m, struct sadb_comb *); 6195 bzero(comb, sizeof(*comb)); 6196 key_getcomb_setlifetime(comb); 6197 comb->sadb_comb_encrypt = i; 6198 /* what should we set into sadb_comb_*_{min,max}bits? */ 6199 } 6200 6201 return m; 6202} 6203 6204/* 6205 * XXX no way to pass mode (transport/tunnel) to userland 6206 * XXX replay checking? 6207 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6208 */ 6209static struct mbuf * 6210key_getprop(saidx) 6211 const struct secasindex *saidx; 6212{ 6213 struct sadb_prop *prop; 6214 struct mbuf *m, *n; 6215 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6216 int totlen; 6217 6218 switch (saidx->proto) { 6219 case IPPROTO_ESP: 6220 m = key_getcomb_esp(); 6221 break; 6222 case IPPROTO_AH: 6223 m = key_getcomb_ah(); 6224 break; 6225 case IPPROTO_IPCOMP: 6226 m = key_getcomb_ipcomp(); 6227 break; 6228 default: 6229 return NULL; 6230 } 6231 6232 if (!m) 6233 return NULL; 6234 M_PREPEND(m, l, M_DONTWAIT); 6235 if (!m) 6236 return NULL; 6237 6238 totlen = 0; 6239 for (n = m; n; n = n->m_next) 6240 totlen += n->m_len; 6241 6242 prop = mtod(m, struct sadb_prop *); 6243 bzero(prop, sizeof(*prop)); 6244 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6245 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6246 prop->sadb_prop_replay = 32; /* XXX */ 6247 6248 return m; 6249} 6250 6251/* 6252 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6253 * send 6254 * <base, SA, address(SD), (address(P)), x_policy, 6255 * (identity(SD),) (sensitivity,) proposal> 6256 * to KMD, and expect to receive 6257 * <base> with SADB_ACQUIRE if error occured, 6258 * or 6259 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6260 * from KMD by PF_KEY. 6261 * 6262 * XXX x_policy is outside of RFC2367 (KAME extension). 6263 * XXX sensitivity is not supported. 6264 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6265 * see comment for key_getcomb_ipcomp(). 6266 * 6267 * OUT: 6268 * 0 : succeed 6269 * others: error number 6270 */ 6271static int 6272key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6273{ 6274 struct mbuf *result = NULL, *m; 6275 struct secacq *newacq; 6276 u_int8_t satype; 6277 int error = -1; 6278 u_int32_t seq; 6279 6280 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6281 satype = key_proto2satype(saidx->proto); 6282 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6283 6284 /* 6285 * We never do anything about acquirng SA. There is anather 6286 * solution that kernel blocks to send SADB_ACQUIRE message until 6287 * getting something message from IKEd. In later case, to be 6288 * managed with ACQUIRING list. 6289 */ 6290 /* Get an entry to check whether sending message or not. */ 6291 if ((newacq = key_getacq(saidx)) != NULL) { 6292 if (V_key_blockacq_count < newacq->count) { 6293 /* reset counter and do send message. */ 6294 newacq->count = 0; 6295 } else { 6296 /* increment counter and do nothing. */ 6297 newacq->count++; 6298 return 0; 6299 } 6300 } else { 6301 /* make new entry for blocking to send SADB_ACQUIRE. */ 6302 if ((newacq = key_newacq(saidx)) == NULL) 6303 return ENOBUFS; 6304 } 6305 6306 6307 seq = newacq->seq; 6308 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6309 if (!m) { 6310 error = ENOBUFS; 6311 goto fail; 6312 } 6313 result = m; 6314 6315 /* 6316 * No SADB_X_EXT_NAT_T_* here: we do not know 6317 * anything related to NAT-T at this time. 6318 */ 6319 6320 /* set sadb_address for saidx's. */ 6321 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6322 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6323 if (!m) { 6324 error = ENOBUFS; 6325 goto fail; 6326 } 6327 m_cat(result, m); 6328 6329 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6330 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6331 if (!m) { 6332 error = ENOBUFS; 6333 goto fail; 6334 } 6335 m_cat(result, m); 6336 6337 /* XXX proxy address (optional) */ 6338 6339 /* set sadb_x_policy */ 6340 if (sp) { 6341 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6342 if (!m) { 6343 error = ENOBUFS; 6344 goto fail; 6345 } 6346 m_cat(result, m); 6347 } 6348 6349 /* XXX identity (optional) */ 6350#if 0 6351 if (idexttype && fqdn) { 6352 /* create identity extension (FQDN) */ 6353 struct sadb_ident *id; 6354 int fqdnlen; 6355 6356 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6357 id = (struct sadb_ident *)p; 6358 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6359 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6360 id->sadb_ident_exttype = idexttype; 6361 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6362 bcopy(fqdn, id + 1, fqdnlen); 6363 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6364 } 6365 6366 if (idexttype) { 6367 /* create identity extension (USERFQDN) */ 6368 struct sadb_ident *id; 6369 int userfqdnlen; 6370 6371 if (userfqdn) { 6372 /* +1 for terminating-NUL */ 6373 userfqdnlen = strlen(userfqdn) + 1; 6374 } else 6375 userfqdnlen = 0; 6376 id = (struct sadb_ident *)p; 6377 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6378 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6379 id->sadb_ident_exttype = idexttype; 6380 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6381 /* XXX is it correct? */ 6382 if (curproc && curproc->p_cred) 6383 id->sadb_ident_id = curproc->p_cred->p_ruid; 6384 if (userfqdn && userfqdnlen) 6385 bcopy(userfqdn, id + 1, userfqdnlen); 6386 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6387 } 6388#endif 6389 6390 /* XXX sensitivity (optional) */ 6391 6392 /* create proposal/combination extension */ 6393 m = key_getprop(saidx); 6394#if 0 6395 /* 6396 * spec conformant: always attach proposal/combination extension, 6397 * the problem is that we have no way to attach it for ipcomp, 6398 * due to the way sadb_comb is declared in RFC2367. 6399 */ 6400 if (!m) { 6401 error = ENOBUFS; 6402 goto fail; 6403 } 6404 m_cat(result, m); 6405#else 6406 /* 6407 * outside of spec; make proposal/combination extension optional. 6408 */ 6409 if (m) 6410 m_cat(result, m); 6411#endif 6412 6413 if ((result->m_flags & M_PKTHDR) == 0) { 6414 error = EINVAL; 6415 goto fail; 6416 } 6417 6418 if (result->m_len < sizeof(struct sadb_msg)) { 6419 result = m_pullup(result, sizeof(struct sadb_msg)); 6420 if (result == NULL) { 6421 error = ENOBUFS; 6422 goto fail; 6423 } 6424 } 6425 6426 result->m_pkthdr.len = 0; 6427 for (m = result; m; m = m->m_next) 6428 result->m_pkthdr.len += m->m_len; 6429 6430 mtod(result, struct sadb_msg *)->sadb_msg_len = 6431 PFKEY_UNIT64(result->m_pkthdr.len); 6432 6433 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6434 6435 fail: 6436 if (result) 6437 m_freem(result); 6438 return error; 6439} 6440 6441static struct secacq * 6442key_newacq(const struct secasindex *saidx) 6443{ 6444 struct secacq *newacq; 6445 6446 /* get new entry */ 6447 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6448 if (newacq == NULL) { 6449 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6450 return NULL; 6451 } 6452 6453 /* copy secindex */ 6454 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6455 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6456 newacq->created = time_second; 6457 newacq->count = 0; 6458 6459 /* add to acqtree */ 6460 ACQ_LOCK(); 6461 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6462 ACQ_UNLOCK(); 6463 6464 return newacq; 6465} 6466 6467static struct secacq * 6468key_getacq(const struct secasindex *saidx) 6469{ 6470 struct secacq *acq; 6471 6472 ACQ_LOCK(); 6473 LIST_FOREACH(acq, &V_acqtree, chain) { 6474 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6475 break; 6476 } 6477 ACQ_UNLOCK(); 6478 6479 return acq; 6480} 6481 6482static struct secacq * 6483key_getacqbyseq(seq) 6484 u_int32_t seq; 6485{ 6486 struct secacq *acq; 6487 6488 ACQ_LOCK(); 6489 LIST_FOREACH(acq, &V_acqtree, chain) { 6490 if (acq->seq == seq) 6491 break; 6492 } 6493 ACQ_UNLOCK(); 6494 6495 return acq; 6496} 6497 6498static struct secspacq * 6499key_newspacq(spidx) 6500 struct secpolicyindex *spidx; 6501{ 6502 struct secspacq *acq; 6503 6504 /* get new entry */ 6505 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6506 if (acq == NULL) { 6507 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6508 return NULL; 6509 } 6510 6511 /* copy secindex */ 6512 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6513 acq->created = time_second; 6514 acq->count = 0; 6515 6516 /* add to spacqtree */ 6517 SPACQ_LOCK(); 6518 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6519 SPACQ_UNLOCK(); 6520 6521 return acq; 6522} 6523 6524static struct secspacq * 6525key_getspacq(spidx) 6526 struct secpolicyindex *spidx; 6527{ 6528 struct secspacq *acq; 6529 6530 SPACQ_LOCK(); 6531 LIST_FOREACH(acq, &V_spacqtree, chain) { 6532 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6533 /* NB: return holding spacq_lock */ 6534 return acq; 6535 } 6536 } 6537 SPACQ_UNLOCK(); 6538 6539 return NULL; 6540} 6541 6542/* 6543 * SADB_ACQUIRE processing, 6544 * in first situation, is receiving 6545 * <base> 6546 * from the ikmpd, and clear sequence of its secasvar entry. 6547 * 6548 * In second situation, is receiving 6549 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6550 * from a user land process, and return 6551 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6552 * to the socket. 6553 * 6554 * m will always be freed. 6555 */ 6556static int 6557key_acquire2(so, m, mhp) 6558 struct socket *so; 6559 struct mbuf *m; 6560 const struct sadb_msghdr *mhp; 6561{ 6562 const struct sadb_address *src0, *dst0; 6563 struct secasindex saidx; 6564 struct secashead *sah; 6565 u_int16_t proto; 6566 int error; 6567 6568 IPSEC_ASSERT(so != NULL, ("null socket")); 6569 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6570 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6571 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6572 6573 /* 6574 * Error message from KMd. 6575 * We assume that if error was occured in IKEd, the length of PFKEY 6576 * message is equal to the size of sadb_msg structure. 6577 * We do not raise error even if error occured in this function. 6578 */ 6579 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6580 struct secacq *acq; 6581 6582 /* check sequence number */ 6583 if (mhp->msg->sadb_msg_seq == 0) { 6584 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6585 "number.\n", __func__)); 6586 m_freem(m); 6587 return 0; 6588 } 6589 6590 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6591 /* 6592 * the specified larval SA is already gone, or we got 6593 * a bogus sequence number. we can silently ignore it. 6594 */ 6595 m_freem(m); 6596 return 0; 6597 } 6598 6599 /* reset acq counter in order to deletion by timehander. */ 6600 acq->created = time_second; 6601 acq->count = 0; 6602 m_freem(m); 6603 return 0; 6604 } 6605 6606 /* 6607 * This message is from user land. 6608 */ 6609 6610 /* map satype to proto */ 6611 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6612 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6613 __func__)); 6614 return key_senderror(so, m, EINVAL); 6615 } 6616 6617 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6618 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6619 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6620 /* error */ 6621 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6622 __func__)); 6623 return key_senderror(so, m, EINVAL); 6624 } 6625 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6626 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6627 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6628 /* error */ 6629 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6630 __func__)); 6631 return key_senderror(so, m, EINVAL); 6632 } 6633 6634 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6635 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6636 6637 /* XXX boundary check against sa_len */ 6638 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6639 6640 /* 6641 * Make sure the port numbers are zero. 6642 * In case of NAT-T we will update them later if needed. 6643 */ 6644 KEY_PORTTOSADDR(&saidx.src, 0); 6645 KEY_PORTTOSADDR(&saidx.dst, 0); 6646 6647#ifndef IPSEC_NAT_T 6648 /* 6649 * Handle NAT-T info if present. 6650 */ 6651 6652 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6653 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6654 struct sadb_x_nat_t_port *sport, *dport; 6655 6656 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6657 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6658 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6659 __func__)); 6660 return key_senderror(so, m, EINVAL); 6661 } 6662 6663 sport = (struct sadb_x_nat_t_port *) 6664 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6665 dport = (struct sadb_x_nat_t_port *) 6666 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6667 6668 if (sport) 6669 KEY_PORTTOSADDR(&saidx.src, 6670 sport->sadb_x_nat_t_port_port); 6671 if (dport) 6672 KEY_PORTTOSADDR(&saidx.dst, 6673 dport->sadb_x_nat_t_port_port); 6674 } 6675#endif 6676 6677 /* get a SA index */ 6678 SAHTREE_LOCK(); 6679 LIST_FOREACH(sah, &V_sahtree, chain) { 6680 if (sah->state == SADB_SASTATE_DEAD) 6681 continue; 6682 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6683 break; 6684 } 6685 SAHTREE_UNLOCK(); 6686 if (sah != NULL) { 6687 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6688 return key_senderror(so, m, EEXIST); 6689 } 6690 6691 error = key_acquire(&saidx, NULL); 6692 if (error != 0) { 6693 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6694 __func__, mhp->msg->sadb_msg_errno)); 6695 return key_senderror(so, m, error); 6696 } 6697 6698 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6699} 6700 6701/* 6702 * SADB_REGISTER processing. 6703 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6704 * receive 6705 * <base> 6706 * from the ikmpd, and register a socket to send PF_KEY messages, 6707 * and send 6708 * <base, supported> 6709 * to KMD by PF_KEY. 6710 * If socket is detached, must free from regnode. 6711 * 6712 * m will always be freed. 6713 */ 6714static int 6715key_register(so, m, mhp) 6716 struct socket *so; 6717 struct mbuf *m; 6718 const struct sadb_msghdr *mhp; 6719{ 6720 struct secreg *reg, *newreg = 0; 6721 6722 IPSEC_ASSERT(so != NULL, ("null socket")); 6723 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6724 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6725 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6726 6727 /* check for invalid register message */ 6728 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6729 return key_senderror(so, m, EINVAL); 6730 6731 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6732 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6733 goto setmsg; 6734 6735 /* check whether existing or not */ 6736 REGTREE_LOCK(); 6737 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6738 if (reg->so == so) { 6739 REGTREE_UNLOCK(); 6740 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6741 __func__)); 6742 return key_senderror(so, m, EEXIST); 6743 } 6744 } 6745 6746 /* create regnode */ 6747 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6748 if (newreg == NULL) { 6749 REGTREE_UNLOCK(); 6750 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6751 return key_senderror(so, m, ENOBUFS); 6752 } 6753 6754 newreg->so = so; 6755 ((struct keycb *)sotorawcb(so))->kp_registered++; 6756 6757 /* add regnode to regtree. */ 6758 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6759 REGTREE_UNLOCK(); 6760 6761 setmsg: 6762 { 6763 struct mbuf *n; 6764 struct sadb_msg *newmsg; 6765 struct sadb_supported *sup; 6766 u_int len, alen, elen; 6767 int off; 6768 int i; 6769 struct sadb_alg *alg; 6770 6771 /* create new sadb_msg to reply. */ 6772 alen = 0; 6773 for (i = 1; i <= SADB_AALG_MAX; i++) { 6774 if (ah_algorithm_lookup(i)) 6775 alen += sizeof(struct sadb_alg); 6776 } 6777 if (alen) 6778 alen += sizeof(struct sadb_supported); 6779 elen = 0; 6780 for (i = 1; i <= SADB_EALG_MAX; i++) { 6781 if (esp_algorithm_lookup(i)) 6782 elen += sizeof(struct sadb_alg); 6783 } 6784 if (elen) 6785 elen += sizeof(struct sadb_supported); 6786 6787 len = sizeof(struct sadb_msg) + alen + elen; 6788 6789 if (len > MCLBYTES) 6790 return key_senderror(so, m, ENOBUFS); 6791 6792 MGETHDR(n, M_DONTWAIT, MT_DATA); 6793 if (len > MHLEN) { 6794 MCLGET(n, M_DONTWAIT); 6795 if ((n->m_flags & M_EXT) == 0) { 6796 m_freem(n); 6797 n = NULL; 6798 } 6799 } 6800 if (!n) 6801 return key_senderror(so, m, ENOBUFS); 6802 6803 n->m_pkthdr.len = n->m_len = len; 6804 n->m_next = NULL; 6805 off = 0; 6806 6807 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6808 newmsg = mtod(n, struct sadb_msg *); 6809 newmsg->sadb_msg_errno = 0; 6810 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6811 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6812 6813 /* for authentication algorithm */ 6814 if (alen) { 6815 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6816 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6817 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6818 off += PFKEY_ALIGN8(sizeof(*sup)); 6819 6820 for (i = 1; i <= SADB_AALG_MAX; i++) { 6821 struct auth_hash *aalgo; 6822 u_int16_t minkeysize, maxkeysize; 6823 6824 aalgo = ah_algorithm_lookup(i); 6825 if (!aalgo) 6826 continue; 6827 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6828 alg->sadb_alg_id = i; 6829 alg->sadb_alg_ivlen = 0; 6830 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6831 alg->sadb_alg_minbits = _BITS(minkeysize); 6832 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6833 off += PFKEY_ALIGN8(sizeof(*alg)); 6834 } 6835 } 6836 6837 /* for encryption algorithm */ 6838 if (elen) { 6839 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6840 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6841 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6842 off += PFKEY_ALIGN8(sizeof(*sup)); 6843 6844 for (i = 1; i <= SADB_EALG_MAX; i++) { 6845 struct enc_xform *ealgo; 6846 6847 ealgo = esp_algorithm_lookup(i); 6848 if (!ealgo) 6849 continue; 6850 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6851 alg->sadb_alg_id = i; 6852 alg->sadb_alg_ivlen = ealgo->blocksize; 6853 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6854 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6855 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6856 } 6857 } 6858 6859 IPSEC_ASSERT(off == len, 6860 ("length assumption failed (off %u len %u)", off, len)); 6861 6862 m_freem(m); 6863 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6864 } 6865} 6866 6867/* 6868 * free secreg entry registered. 6869 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6870 */ 6871void 6872key_freereg(struct socket *so) 6873{ 6874 struct secreg *reg; 6875 int i; 6876 6877 IPSEC_ASSERT(so != NULL, ("NULL so")); 6878 6879 /* 6880 * check whether existing or not. 6881 * check all type of SA, because there is a potential that 6882 * one socket is registered to multiple type of SA. 6883 */ 6884 REGTREE_LOCK(); 6885 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6886 LIST_FOREACH(reg, &V_regtree[i], chain) { 6887 if (reg->so == so && __LIST_CHAINED(reg)) { 6888 LIST_REMOVE(reg, chain); 6889 free(reg, M_IPSEC_SAR); 6890 break; 6891 } 6892 } 6893 } 6894 REGTREE_UNLOCK(); 6895} 6896 6897/* 6898 * SADB_EXPIRE processing 6899 * send 6900 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6901 * to KMD by PF_KEY. 6902 * NOTE: We send only soft lifetime extension. 6903 * 6904 * OUT: 0 : succeed 6905 * others : error number 6906 */ 6907static int 6908key_expire(struct secasvar *sav) 6909{ 6910 int s; 6911 int satype; 6912 struct mbuf *result = NULL, *m; 6913 int len; 6914 int error = -1; 6915 struct sadb_lifetime *lt; 6916 6917 /* XXX: Why do we lock ? */ 6918 s = splnet(); /*called from softclock()*/ 6919 6920 IPSEC_ASSERT (sav != NULL, ("null sav")); 6921 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6922 6923 /* set msg header */ 6924 satype = key_proto2satype(sav->sah->saidx.proto); 6925 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6926 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6927 if (!m) { 6928 error = ENOBUFS; 6929 goto fail; 6930 } 6931 result = m; 6932 6933 /* create SA extension */ 6934 m = key_setsadbsa(sav); 6935 if (!m) { 6936 error = ENOBUFS; 6937 goto fail; 6938 } 6939 m_cat(result, m); 6940 6941 /* create SA extension */ 6942 m = key_setsadbxsa2(sav->sah->saidx.mode, 6943 sav->replay ? sav->replay->count : 0, 6944 sav->sah->saidx.reqid); 6945 if (!m) { 6946 error = ENOBUFS; 6947 goto fail; 6948 } 6949 m_cat(result, m); 6950 6951 /* create lifetime extension (current and soft) */ 6952 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6953 m = key_alloc_mbuf(len); 6954 if (!m || m->m_next) { /*XXX*/ 6955 if (m) 6956 m_freem(m); 6957 error = ENOBUFS; 6958 goto fail; 6959 } 6960 bzero(mtod(m, caddr_t), len); 6961 lt = mtod(m, struct sadb_lifetime *); 6962 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6963 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6964 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6965 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6966 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6967 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6968 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6969 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6970 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6971 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6972 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6973 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6974 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6975 m_cat(result, m); 6976 6977 /* set sadb_address for source */ 6978 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6979 &sav->sah->saidx.src.sa, 6980 FULLMASK, IPSEC_ULPROTO_ANY); 6981 if (!m) { 6982 error = ENOBUFS; 6983 goto fail; 6984 } 6985 m_cat(result, m); 6986 6987 /* set sadb_address for destination */ 6988 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6989 &sav->sah->saidx.dst.sa, 6990 FULLMASK, IPSEC_ULPROTO_ANY); 6991 if (!m) { 6992 error = ENOBUFS; 6993 goto fail; 6994 } 6995 m_cat(result, m); 6996 6997 /* 6998 * XXX-BZ Handle NAT-T extensions here. 6999 */ 7000 7001 if ((result->m_flags & M_PKTHDR) == 0) { 7002 error = EINVAL; 7003 goto fail; 7004 } 7005 7006 if (result->m_len < sizeof(struct sadb_msg)) { 7007 result = m_pullup(result, sizeof(struct sadb_msg)); 7008 if (result == NULL) { 7009 error = ENOBUFS; 7010 goto fail; 7011 } 7012 } 7013 7014 result->m_pkthdr.len = 0; 7015 for (m = result; m; m = m->m_next) 7016 result->m_pkthdr.len += m->m_len; 7017 7018 mtod(result, struct sadb_msg *)->sadb_msg_len = 7019 PFKEY_UNIT64(result->m_pkthdr.len); 7020 7021 splx(s); 7022 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 7023 7024 fail: 7025 if (result) 7026 m_freem(result); 7027 splx(s); 7028 return error; 7029} 7030 7031/* 7032 * SADB_FLUSH processing 7033 * receive 7034 * <base> 7035 * from the ikmpd, and free all entries in secastree. 7036 * and send, 7037 * <base> 7038 * to the ikmpd. 7039 * NOTE: to do is only marking SADB_SASTATE_DEAD. 7040 * 7041 * m will always be freed. 7042 */ 7043static int 7044key_flush(so, m, mhp) 7045 struct socket *so; 7046 struct mbuf *m; 7047 const struct sadb_msghdr *mhp; 7048{ 7049 struct sadb_msg *newmsg; 7050 struct secashead *sah, *nextsah; 7051 struct secasvar *sav, *nextsav; 7052 u_int16_t proto; 7053 u_int8_t state; 7054 u_int stateidx; 7055 7056 IPSEC_ASSERT(so != NULL, ("null socket")); 7057 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7058 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7059 7060 /* map satype to proto */ 7061 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7062 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7063 __func__)); 7064 return key_senderror(so, m, EINVAL); 7065 } 7066 7067 /* no SATYPE specified, i.e. flushing all SA. */ 7068 SAHTREE_LOCK(); 7069 for (sah = LIST_FIRST(&V_sahtree); 7070 sah != NULL; 7071 sah = nextsah) { 7072 nextsah = LIST_NEXT(sah, chain); 7073 7074 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7075 && proto != sah->saidx.proto) 7076 continue; 7077 7078 for (stateidx = 0; 7079 stateidx < _ARRAYLEN(saorder_state_alive); 7080 stateidx++) { 7081 state = saorder_state_any[stateidx]; 7082 for (sav = LIST_FIRST(&sah->savtree[state]); 7083 sav != NULL; 7084 sav = nextsav) { 7085 7086 nextsav = LIST_NEXT(sav, chain); 7087 7088 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 7089 KEY_FREESAV(&sav); 7090 } 7091 } 7092 7093 sah->state = SADB_SASTATE_DEAD; 7094 } 7095 SAHTREE_UNLOCK(); 7096 7097 if (m->m_len < sizeof(struct sadb_msg) || 7098 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 7099 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 7100 return key_senderror(so, m, ENOBUFS); 7101 } 7102 7103 if (m->m_next) 7104 m_freem(m->m_next); 7105 m->m_next = NULL; 7106 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 7107 newmsg = mtod(m, struct sadb_msg *); 7108 newmsg->sadb_msg_errno = 0; 7109 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 7110 7111 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7112} 7113 7114/* 7115 * SADB_DUMP processing 7116 * dump all entries including status of DEAD in SAD. 7117 * receive 7118 * <base> 7119 * from the ikmpd, and dump all secasvar leaves 7120 * and send, 7121 * <base> ..... 7122 * to the ikmpd. 7123 * 7124 * m will always be freed. 7125 */ 7126static int 7127key_dump(so, m, mhp) 7128 struct socket *so; 7129 struct mbuf *m; 7130 const struct sadb_msghdr *mhp; 7131{ 7132 struct secashead *sah; 7133 struct secasvar *sav; 7134 u_int16_t proto; 7135 u_int stateidx; 7136 u_int8_t satype; 7137 u_int8_t state; 7138 int cnt; 7139 struct sadb_msg *newmsg; 7140 struct mbuf *n; 7141 7142 IPSEC_ASSERT(so != NULL, ("null socket")); 7143 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7144 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7145 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7146 7147 /* map satype to proto */ 7148 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7149 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7150 __func__)); 7151 return key_senderror(so, m, EINVAL); 7152 } 7153 7154 /* count sav entries to be sent to the userland. */ 7155 cnt = 0; 7156 SAHTREE_LOCK(); 7157 LIST_FOREACH(sah, &V_sahtree, chain) { 7158 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7159 && proto != sah->saidx.proto) 7160 continue; 7161 7162 for (stateidx = 0; 7163 stateidx < _ARRAYLEN(saorder_state_any); 7164 stateidx++) { 7165 state = saorder_state_any[stateidx]; 7166 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7167 cnt++; 7168 } 7169 } 7170 } 7171 7172 if (cnt == 0) { 7173 SAHTREE_UNLOCK(); 7174 return key_senderror(so, m, ENOENT); 7175 } 7176 7177 /* send this to the userland, one at a time. */ 7178 newmsg = NULL; 7179 LIST_FOREACH(sah, &V_sahtree, chain) { 7180 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7181 && proto != sah->saidx.proto) 7182 continue; 7183 7184 /* map proto to satype */ 7185 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7186 SAHTREE_UNLOCK(); 7187 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7188 "SAD.\n", __func__)); 7189 return key_senderror(so, m, EINVAL); 7190 } 7191 7192 for (stateidx = 0; 7193 stateidx < _ARRAYLEN(saorder_state_any); 7194 stateidx++) { 7195 state = saorder_state_any[stateidx]; 7196 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7197 n = key_setdumpsa(sav, SADB_DUMP, satype, 7198 --cnt, mhp->msg->sadb_msg_pid); 7199 if (!n) { 7200 SAHTREE_UNLOCK(); 7201 return key_senderror(so, m, ENOBUFS); 7202 } 7203 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7204 } 7205 } 7206 } 7207 SAHTREE_UNLOCK(); 7208 7209 m_freem(m); 7210 return 0; 7211} 7212 7213/* 7214 * SADB_X_PROMISC processing 7215 * 7216 * m will always be freed. 7217 */ 7218static int 7219key_promisc(so, m, mhp) 7220 struct socket *so; 7221 struct mbuf *m; 7222 const struct sadb_msghdr *mhp; 7223{ 7224 int olen; 7225 7226 IPSEC_ASSERT(so != NULL, ("null socket")); 7227 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7228 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7229 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7230 7231 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7232 7233 if (olen < sizeof(struct sadb_msg)) { 7234#if 1 7235 return key_senderror(so, m, EINVAL); 7236#else 7237 m_freem(m); 7238 return 0; 7239#endif 7240 } else if (olen == sizeof(struct sadb_msg)) { 7241 /* enable/disable promisc mode */ 7242 struct keycb *kp; 7243 7244 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7245 return key_senderror(so, m, EINVAL); 7246 mhp->msg->sadb_msg_errno = 0; 7247 switch (mhp->msg->sadb_msg_satype) { 7248 case 0: 7249 case 1: 7250 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7251 break; 7252 default: 7253 return key_senderror(so, m, EINVAL); 7254 } 7255 7256 /* send the original message back to everyone */ 7257 mhp->msg->sadb_msg_errno = 0; 7258 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7259 } else { 7260 /* send packet as is */ 7261 7262 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7263 7264 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7265 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7266 } 7267} 7268 7269static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 7270 const struct sadb_msghdr *)) = { 7271 NULL, /* SADB_RESERVED */ 7272 key_getspi, /* SADB_GETSPI */ 7273 key_update, /* SADB_UPDATE */ 7274 key_add, /* SADB_ADD */ 7275 key_delete, /* SADB_DELETE */ 7276 key_get, /* SADB_GET */ 7277 key_acquire2, /* SADB_ACQUIRE */ 7278 key_register, /* SADB_REGISTER */ 7279 NULL, /* SADB_EXPIRE */ 7280 key_flush, /* SADB_FLUSH */ 7281 key_dump, /* SADB_DUMP */ 7282 key_promisc, /* SADB_X_PROMISC */ 7283 NULL, /* SADB_X_PCHANGE */ 7284 key_spdadd, /* SADB_X_SPDUPDATE */ 7285 key_spdadd, /* SADB_X_SPDADD */ 7286 key_spddelete, /* SADB_X_SPDDELETE */ 7287 key_spdget, /* SADB_X_SPDGET */ 7288 NULL, /* SADB_X_SPDACQUIRE */ 7289 key_spddump, /* SADB_X_SPDDUMP */ 7290 key_spdflush, /* SADB_X_SPDFLUSH */ 7291 key_spdadd, /* SADB_X_SPDSETIDX */ 7292 NULL, /* SADB_X_SPDEXPIRE */ 7293 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7294}; 7295 7296/* 7297 * parse sadb_msg buffer to process PFKEYv2, 7298 * and create a data to response if needed. 7299 * I think to be dealed with mbuf directly. 7300 * IN: 7301 * msgp : pointer to pointer to a received buffer pulluped. 7302 * This is rewrited to response. 7303 * so : pointer to socket. 7304 * OUT: 7305 * length for buffer to send to user process. 7306 */ 7307int 7308key_parse(m, so) 7309 struct mbuf *m; 7310 struct socket *so; 7311{ 7312 struct sadb_msg *msg; 7313 struct sadb_msghdr mh; 7314 u_int orglen; 7315 int error; 7316 int target; 7317 7318 IPSEC_ASSERT(so != NULL, ("null socket")); 7319 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7320 7321#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7322 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7323 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7324 kdebug_sadb(msg)); 7325#endif 7326 7327 if (m->m_len < sizeof(struct sadb_msg)) { 7328 m = m_pullup(m, sizeof(struct sadb_msg)); 7329 if (!m) 7330 return ENOBUFS; 7331 } 7332 msg = mtod(m, struct sadb_msg *); 7333 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7334 target = KEY_SENDUP_ONE; 7335 7336 if ((m->m_flags & M_PKTHDR) == 0 || 7337 m->m_pkthdr.len != m->m_pkthdr.len) { 7338 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7339 V_pfkeystat.out_invlen++; 7340 error = EINVAL; 7341 goto senderror; 7342 } 7343 7344 if (msg->sadb_msg_version != PF_KEY_V2) { 7345 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7346 __func__, msg->sadb_msg_version)); 7347 V_pfkeystat.out_invver++; 7348 error = EINVAL; 7349 goto senderror; 7350 } 7351 7352 if (msg->sadb_msg_type > SADB_MAX) { 7353 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7354 __func__, msg->sadb_msg_type)); 7355 V_pfkeystat.out_invmsgtype++; 7356 error = EINVAL; 7357 goto senderror; 7358 } 7359 7360 /* for old-fashioned code - should be nuked */ 7361 if (m->m_pkthdr.len > MCLBYTES) { 7362 m_freem(m); 7363 return ENOBUFS; 7364 } 7365 if (m->m_next) { 7366 struct mbuf *n; 7367 7368 MGETHDR(n, M_DONTWAIT, MT_DATA); 7369 if (n && m->m_pkthdr.len > MHLEN) { 7370 MCLGET(n, M_DONTWAIT); 7371 if ((n->m_flags & M_EXT) == 0) { 7372 m_free(n); 7373 n = NULL; 7374 } 7375 } 7376 if (!n) { 7377 m_freem(m); 7378 return ENOBUFS; 7379 } 7380 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7381 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7382 n->m_next = NULL; 7383 m_freem(m); 7384 m = n; 7385 } 7386 7387 /* align the mbuf chain so that extensions are in contiguous region. */ 7388 error = key_align(m, &mh); 7389 if (error) 7390 return error; 7391 7392 msg = mh.msg; 7393 7394 /* check SA type */ 7395 switch (msg->sadb_msg_satype) { 7396 case SADB_SATYPE_UNSPEC: 7397 switch (msg->sadb_msg_type) { 7398 case SADB_GETSPI: 7399 case SADB_UPDATE: 7400 case SADB_ADD: 7401 case SADB_DELETE: 7402 case SADB_GET: 7403 case SADB_ACQUIRE: 7404 case SADB_EXPIRE: 7405 ipseclog((LOG_DEBUG, "%s: must specify satype " 7406 "when msg type=%u.\n", __func__, 7407 msg->sadb_msg_type)); 7408 V_pfkeystat.out_invsatype++; 7409 error = EINVAL; 7410 goto senderror; 7411 } 7412 break; 7413 case SADB_SATYPE_AH: 7414 case SADB_SATYPE_ESP: 7415 case SADB_X_SATYPE_IPCOMP: 7416 case SADB_X_SATYPE_TCPSIGNATURE: 7417 switch (msg->sadb_msg_type) { 7418 case SADB_X_SPDADD: 7419 case SADB_X_SPDDELETE: 7420 case SADB_X_SPDGET: 7421 case SADB_X_SPDDUMP: 7422 case SADB_X_SPDFLUSH: 7423 case SADB_X_SPDSETIDX: 7424 case SADB_X_SPDUPDATE: 7425 case SADB_X_SPDDELETE2: 7426 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7427 __func__, msg->sadb_msg_type)); 7428 V_pfkeystat.out_invsatype++; 7429 error = EINVAL; 7430 goto senderror; 7431 } 7432 break; 7433 case SADB_SATYPE_RSVP: 7434 case SADB_SATYPE_OSPFV2: 7435 case SADB_SATYPE_RIPV2: 7436 case SADB_SATYPE_MIP: 7437 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7438 __func__, msg->sadb_msg_satype)); 7439 V_pfkeystat.out_invsatype++; 7440 error = EOPNOTSUPP; 7441 goto senderror; 7442 case 1: /* XXX: What does it do? */ 7443 if (msg->sadb_msg_type == SADB_X_PROMISC) 7444 break; 7445 /*FALLTHROUGH*/ 7446 default: 7447 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7448 __func__, msg->sadb_msg_satype)); 7449 V_pfkeystat.out_invsatype++; 7450 error = EINVAL; 7451 goto senderror; 7452 } 7453 7454 /* check field of upper layer protocol and address family */ 7455 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7456 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7457 struct sadb_address *src0, *dst0; 7458 u_int plen; 7459 7460 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7461 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7462 7463 /* check upper layer protocol */ 7464 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7465 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7466 "mismatched.\n", __func__)); 7467 V_pfkeystat.out_invaddr++; 7468 error = EINVAL; 7469 goto senderror; 7470 } 7471 7472 /* check family */ 7473 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7474 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7475 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7476 __func__)); 7477 V_pfkeystat.out_invaddr++; 7478 error = EINVAL; 7479 goto senderror; 7480 } 7481 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7482 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7483 ipseclog((LOG_DEBUG, "%s: address struct size " 7484 "mismatched.\n", __func__)); 7485 V_pfkeystat.out_invaddr++; 7486 error = EINVAL; 7487 goto senderror; 7488 } 7489 7490 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7491 case AF_INET: 7492 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7493 sizeof(struct sockaddr_in)) { 7494 V_pfkeystat.out_invaddr++; 7495 error = EINVAL; 7496 goto senderror; 7497 } 7498 break; 7499 case AF_INET6: 7500 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7501 sizeof(struct sockaddr_in6)) { 7502 V_pfkeystat.out_invaddr++; 7503 error = EINVAL; 7504 goto senderror; 7505 } 7506 break; 7507 default: 7508 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7509 __func__)); 7510 V_pfkeystat.out_invaddr++; 7511 error = EAFNOSUPPORT; 7512 goto senderror; 7513 } 7514 7515 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7516 case AF_INET: 7517 plen = sizeof(struct in_addr) << 3; 7518 break; 7519 case AF_INET6: 7520 plen = sizeof(struct in6_addr) << 3; 7521 break; 7522 default: 7523 plen = 0; /*fool gcc*/ 7524 break; 7525 } 7526 7527 /* check max prefix length */ 7528 if (src0->sadb_address_prefixlen > plen || 7529 dst0->sadb_address_prefixlen > plen) { 7530 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7531 __func__)); 7532 V_pfkeystat.out_invaddr++; 7533 error = EINVAL; 7534 goto senderror; 7535 } 7536 7537 /* 7538 * prefixlen == 0 is valid because there can be a case when 7539 * all addresses are matched. 7540 */ 7541 } 7542 7543 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7544 key_typesw[msg->sadb_msg_type] == NULL) { 7545 V_pfkeystat.out_invmsgtype++; 7546 error = EINVAL; 7547 goto senderror; 7548 } 7549 7550 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7551 7552senderror: 7553 msg->sadb_msg_errno = error; 7554 return key_sendup_mbuf(so, m, target); 7555} 7556 7557static int 7558key_senderror(so, m, code) 7559 struct socket *so; 7560 struct mbuf *m; 7561 int code; 7562{ 7563 struct sadb_msg *msg; 7564 7565 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7566 ("mbuf too small, len %u", m->m_len)); 7567 7568 msg = mtod(m, struct sadb_msg *); 7569 msg->sadb_msg_errno = code; 7570 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7571} 7572 7573/* 7574 * set the pointer to each header into message buffer. 7575 * m will be freed on error. 7576 * XXX larger-than-MCLBYTES extension? 7577 */ 7578static int 7579key_align(m, mhp) 7580 struct mbuf *m; 7581 struct sadb_msghdr *mhp; 7582{ 7583 struct mbuf *n; 7584 struct sadb_ext *ext; 7585 size_t off, end; 7586 int extlen; 7587 int toff; 7588 7589 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7590 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7591 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7592 ("mbuf too small, len %u", m->m_len)); 7593 7594 /* initialize */ 7595 bzero(mhp, sizeof(*mhp)); 7596 7597 mhp->msg = mtod(m, struct sadb_msg *); 7598 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7599 7600 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7601 extlen = end; /*just in case extlen is not updated*/ 7602 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7603 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7604 if (!n) { 7605 /* m is already freed */ 7606 return ENOBUFS; 7607 } 7608 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7609 7610 /* set pointer */ 7611 switch (ext->sadb_ext_type) { 7612 case SADB_EXT_SA: 7613 case SADB_EXT_ADDRESS_SRC: 7614 case SADB_EXT_ADDRESS_DST: 7615 case SADB_EXT_ADDRESS_PROXY: 7616 case SADB_EXT_LIFETIME_CURRENT: 7617 case SADB_EXT_LIFETIME_HARD: 7618 case SADB_EXT_LIFETIME_SOFT: 7619 case SADB_EXT_KEY_AUTH: 7620 case SADB_EXT_KEY_ENCRYPT: 7621 case SADB_EXT_IDENTITY_SRC: 7622 case SADB_EXT_IDENTITY_DST: 7623 case SADB_EXT_SENSITIVITY: 7624 case SADB_EXT_PROPOSAL: 7625 case SADB_EXT_SUPPORTED_AUTH: 7626 case SADB_EXT_SUPPORTED_ENCRYPT: 7627 case SADB_EXT_SPIRANGE: 7628 case SADB_X_EXT_POLICY: 7629 case SADB_X_EXT_SA2: 7630#ifdef IPSEC_NAT_T 7631 case SADB_X_EXT_NAT_T_TYPE: 7632 case SADB_X_EXT_NAT_T_SPORT: 7633 case SADB_X_EXT_NAT_T_DPORT: 7634 case SADB_X_EXT_NAT_T_OAI: 7635 case SADB_X_EXT_NAT_T_OAR: 7636 case SADB_X_EXT_NAT_T_FRAG: 7637#endif 7638 /* duplicate check */ 7639 /* 7640 * XXX Are there duplication payloads of either 7641 * KEY_AUTH or KEY_ENCRYPT ? 7642 */ 7643 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7644 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7645 "%u\n", __func__, ext->sadb_ext_type)); 7646 m_freem(m); 7647 V_pfkeystat.out_dupext++; 7648 return EINVAL; 7649 } 7650 break; 7651 default: 7652 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7653 __func__, ext->sadb_ext_type)); 7654 m_freem(m); 7655 V_pfkeystat.out_invexttype++; 7656 return EINVAL; 7657 } 7658 7659 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7660 7661 if (key_validate_ext(ext, extlen)) { 7662 m_freem(m); 7663 V_pfkeystat.out_invlen++; 7664 return EINVAL; 7665 } 7666 7667 n = m_pulldown(m, off, extlen, &toff); 7668 if (!n) { 7669 /* m is already freed */ 7670 return ENOBUFS; 7671 } 7672 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7673 7674 mhp->ext[ext->sadb_ext_type] = ext; 7675 mhp->extoff[ext->sadb_ext_type] = off; 7676 mhp->extlen[ext->sadb_ext_type] = extlen; 7677 } 7678 7679 if (off != end) { 7680 m_freem(m); 7681 V_pfkeystat.out_invlen++; 7682 return EINVAL; 7683 } 7684 7685 return 0; 7686} 7687 7688static int 7689key_validate_ext(ext, len) 7690 const struct sadb_ext *ext; 7691 int len; 7692{ 7693 const struct sockaddr *sa; 7694 enum { NONE, ADDR } checktype = NONE; 7695 int baselen = 0; 7696 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7697 7698 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7699 return EINVAL; 7700 7701 /* if it does not match minimum/maximum length, bail */ 7702 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7703 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7704 return EINVAL; 7705 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7706 return EINVAL; 7707 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7708 return EINVAL; 7709 7710 /* more checks based on sadb_ext_type XXX need more */ 7711 switch (ext->sadb_ext_type) { 7712 case SADB_EXT_ADDRESS_SRC: 7713 case SADB_EXT_ADDRESS_DST: 7714 case SADB_EXT_ADDRESS_PROXY: 7715 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7716 checktype = ADDR; 7717 break; 7718 case SADB_EXT_IDENTITY_SRC: 7719 case SADB_EXT_IDENTITY_DST: 7720 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7721 SADB_X_IDENTTYPE_ADDR) { 7722 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7723 checktype = ADDR; 7724 } else 7725 checktype = NONE; 7726 break; 7727 default: 7728 checktype = NONE; 7729 break; 7730 } 7731 7732 switch (checktype) { 7733 case NONE: 7734 break; 7735 case ADDR: 7736 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7737 if (len < baselen + sal) 7738 return EINVAL; 7739 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7740 return EINVAL; 7741 break; 7742 } 7743 7744 return 0; 7745} 7746 7747void 7748key_init(void) 7749{ 7750 int i; 7751 7752 for (i = 0; i < IPSEC_DIR_MAX; i++) 7753 LIST_INIT(&V_sptree[i]); 7754 7755 LIST_INIT(&V_sahtree); 7756 7757 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7758 LIST_INIT(&V_regtree[i]); 7759 7760 LIST_INIT(&V_acqtree); 7761 LIST_INIT(&V_spacqtree); 7762 7763 /* system default */ 7764 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7765 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7766 7767 if (!IS_DEFAULT_VNET(curvnet)) 7768 return; 7769 7770 SPTREE_LOCK_INIT(); 7771 REGTREE_LOCK_INIT(); 7772 SAHTREE_LOCK_INIT(); 7773 ACQ_LOCK_INIT(); 7774 SPACQ_LOCK_INIT(); 7775 7776#ifndef IPSEC_DEBUG2 7777 timeout((void *)key_timehandler, (void *)0, hz); 7778#endif /*IPSEC_DEBUG2*/ 7779 7780 /* initialize key statistics */ 7781 keystat.getspi_count = 1; 7782 7783 printf("IPsec: Initialized Security Association Processing.\n"); 7784} 7785 7786#ifdef VIMAGE 7787void 7788key_destroy(void) 7789{ 7790 struct secpolicy *sp, *nextsp; 7791 struct secspacq *acq, *nextacq; 7792 struct secashead *sah, *nextsah; 7793 struct secreg *reg; 7794 int i; 7795 7796 SPTREE_LOCK(); 7797 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7798 for (sp = LIST_FIRST(&V_sptree[i]); 7799 sp != NULL; sp = nextsp) { 7800 nextsp = LIST_NEXT(sp, chain); 7801 if (__LIST_CHAINED(sp)) { 7802 LIST_REMOVE(sp, chain); 7803 free(sp, M_IPSEC_SP); 7804 } 7805 } 7806 } 7807 SPTREE_UNLOCK(); 7808 7809 SAHTREE_LOCK(); 7810 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7811 nextsah = LIST_NEXT(sah, chain); 7812 if (__LIST_CHAINED(sah)) { 7813 LIST_REMOVE(sah, chain); 7814 free(sah, M_IPSEC_SAH); 7815 } 7816 } 7817 SAHTREE_UNLOCK(); 7818 7819 REGTREE_LOCK(); 7820 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7821 LIST_FOREACH(reg, &V_regtree[i], chain) { 7822 if (__LIST_CHAINED(reg)) { 7823 LIST_REMOVE(reg, chain); 7824 free(reg, M_IPSEC_SAR); 7825 break; 7826 } 7827 } 7828 } 7829 REGTREE_UNLOCK(); 7830 7831 ACQ_LOCK(); 7832 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7833 nextacq = LIST_NEXT(acq, chain); 7834 if (__LIST_CHAINED(acq)) { 7835 LIST_REMOVE(acq, chain); 7836 free(acq, M_IPSEC_SAQ); 7837 } 7838 } 7839 ACQ_UNLOCK(); 7840 7841 SPACQ_LOCK(); 7842 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7843 nextacq = LIST_NEXT(acq, chain); 7844 if (__LIST_CHAINED(acq)) { 7845 LIST_REMOVE(acq, chain); 7846 free(acq, M_IPSEC_SAQ); 7847 } 7848 } 7849 SPACQ_UNLOCK(); 7850} 7851#endif 7852 7853/* 7854 * XXX: maybe This function is called after INBOUND IPsec processing. 7855 * 7856 * Special check for tunnel-mode packets. 7857 * We must make some checks for consistency between inner and outer IP header. 7858 * 7859 * xxx more checks to be provided 7860 */ 7861int 7862key_checktunnelsanity(sav, family, src, dst) 7863 struct secasvar *sav; 7864 u_int family; 7865 caddr_t src; 7866 caddr_t dst; 7867{ 7868 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7869 7870 /* XXX: check inner IP header */ 7871 7872 return 1; 7873} 7874 7875/* record data transfer on SA, and update timestamps */ 7876void 7877key_sa_recordxfer(sav, m) 7878 struct secasvar *sav; 7879 struct mbuf *m; 7880{ 7881 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7882 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7883 if (!sav->lft_c) 7884 return; 7885 7886 /* 7887 * XXX Currently, there is a difference of bytes size 7888 * between inbound and outbound processing. 7889 */ 7890 sav->lft_c->bytes += m->m_pkthdr.len; 7891 /* to check bytes lifetime is done in key_timehandler(). */ 7892 7893 /* 7894 * We use the number of packets as the unit of 7895 * allocations. We increment the variable 7896 * whenever {esp,ah}_{in,out}put is called. 7897 */ 7898 sav->lft_c->allocations++; 7899 /* XXX check for expires? */ 7900 7901 /* 7902 * NOTE: We record CURRENT usetime by using wall clock, 7903 * in seconds. HARD and SOFT lifetime are measured by the time 7904 * difference (again in seconds) from usetime. 7905 * 7906 * usetime 7907 * v expire expire 7908 * -----+-----+--------+---> t 7909 * <--------------> HARD 7910 * <-----> SOFT 7911 */ 7912 sav->lft_c->usetime = time_second; 7913 /* XXX check for expires? */ 7914 7915 return; 7916} 7917 7918/* dumb version */ 7919void 7920key_sa_routechange(dst) 7921 struct sockaddr *dst; 7922{ 7923 struct secashead *sah; 7924 struct route *ro; 7925 7926 SAHTREE_LOCK(); 7927 LIST_FOREACH(sah, &V_sahtree, chain) { 7928 ro = &sah->sa_route; 7929 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7930 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7931 RTFREE(ro->ro_rt); 7932 ro->ro_rt = (struct rtentry *)NULL; 7933 } 7934 } 7935 SAHTREE_UNLOCK(); 7936} 7937 7938static void 7939key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7940{ 7941 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7942 SAHTREE_LOCK_ASSERT(); 7943 7944 if (sav->state != state) { 7945 if (__LIST_CHAINED(sav)) 7946 LIST_REMOVE(sav, chain); 7947 sav->state = state; 7948 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7949 } 7950} 7951 7952void 7953key_sa_stir_iv(sav) 7954 struct secasvar *sav; 7955{ 7956 7957 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7958 key_randomfill(sav->iv, sav->ivlen); 7959} 7960 7961/* XXX too much? */ 7962static struct mbuf * 7963key_alloc_mbuf(l) 7964 int l; 7965{ 7966 struct mbuf *m = NULL, *n; 7967 int len, t; 7968 7969 len = l; 7970 while (len > 0) { 7971 MGET(n, M_DONTWAIT, MT_DATA); 7972 if (n && len > MLEN) 7973 MCLGET(n, M_DONTWAIT); 7974 if (!n) { 7975 m_freem(m); 7976 return NULL; 7977 } 7978 7979 n->m_next = NULL; 7980 n->m_len = 0; 7981 n->m_len = M_TRAILINGSPACE(n); 7982 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7983 if (n->m_len > len) { 7984 t = (n->m_len - len) & ~(sizeof(long) - 1); 7985 n->m_data += t; 7986 n->m_len = len; 7987 } 7988 7989 len -= n->m_len; 7990 7991 if (m) 7992 m_cat(m, n); 7993 else 7994 m = n; 7995 } 7996 7997 return m; 7998} 7999 8000/* 8001 * Take one of the kernel's security keys and convert it into a PF_KEY 8002 * structure within an mbuf, suitable for sending up to a waiting 8003 * application in user land. 8004 * 8005 * IN: 8006 * src: A pointer to a kernel security key. 8007 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 8008 * OUT: 8009 * a valid mbuf or NULL indicating an error 8010 * 8011 */ 8012 8013static struct mbuf * 8014key_setkey(struct seckey *src, u_int16_t exttype) 8015{ 8016 struct mbuf *m; 8017 struct sadb_key *p; 8018 int len; 8019 8020 if (src == NULL) 8021 return NULL; 8022 8023 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 8024 m = key_alloc_mbuf(len); 8025 if (m == NULL) 8026 return NULL; 8027 p = mtod(m, struct sadb_key *); 8028 bzero(p, len); 8029 p->sadb_key_len = PFKEY_UNIT64(len); 8030 p->sadb_key_exttype = exttype; 8031 p->sadb_key_bits = src->bits; 8032 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 8033 8034 return m; 8035} 8036 8037/* 8038 * Take one of the kernel's lifetime data structures and convert it 8039 * into a PF_KEY structure within an mbuf, suitable for sending up to 8040 * a waiting application in user land. 8041 * 8042 * IN: 8043 * src: A pointer to a kernel lifetime structure. 8044 * exttype: Which type of lifetime this is. Refer to the PF_KEY 8045 * data structures for more information. 8046 * OUT: 8047 * a valid mbuf or NULL indicating an error 8048 * 8049 */ 8050 8051static struct mbuf * 8052key_setlifetime(struct seclifetime *src, u_int16_t exttype) 8053{ 8054 struct mbuf *m = NULL; 8055 struct sadb_lifetime *p; 8056 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 8057 8058 if (src == NULL) 8059 return NULL; 8060 8061 m = key_alloc_mbuf(len); 8062 if (m == NULL) 8063 return m; 8064 p = mtod(m, struct sadb_lifetime *); 8065 8066 bzero(p, len); 8067 p->sadb_lifetime_len = PFKEY_UNIT64(len); 8068 p->sadb_lifetime_exttype = exttype; 8069 p->sadb_lifetime_allocations = src->allocations; 8070 p->sadb_lifetime_bytes = src->bytes; 8071 p->sadb_lifetime_addtime = src->addtime; 8072 p->sadb_lifetime_usetime = src->usetime; 8073 8074 return m; 8075 8076} 8077