key.c revision 196883
1/* $FreeBSD: head/sys/netipsec/key.c 196883 2009-09-06 07:32:16Z pjd $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59 60#include <net/if.h> 61#include <net/route.h> 62#include <net/raw_cb.h> 63#include <net/vnet.h> 64 65#include <netinet/in.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#include <netinet/in_var.h> 69 70#ifdef INET6 71#include <netinet/ip6.h> 72#include <netinet6/in6_var.h> 73#include <netinet6/ip6_var.h> 74#endif /* INET6 */ 75 76#ifdef INET 77#include <netinet/in_pcb.h> 78#endif 79#ifdef INET6 80#include <netinet6/in6_pcb.h> 81#endif /* INET6 */ 82 83#include <net/pfkeyv2.h> 84#include <netipsec/keydb.h> 85#include <netipsec/key.h> 86#include <netipsec/keysock.h> 87#include <netipsec/key_debug.h> 88 89#include <netipsec/ipsec.h> 90#ifdef INET6 91#include <netipsec/ipsec6.h> 92#endif 93 94#include <netipsec/xform.h> 95 96#include <machine/stdarg.h> 97 98/* randomness */ 99#include <sys/random.h> 100 101#define FULLMASK 0xff 102#define _BITS(bytes) ((bytes) << 3) 103 104/* 105 * Note on SA reference counting: 106 * - SAs that are not in DEAD state will have (total external reference + 1) 107 * following value in reference count field. they cannot be freed and are 108 * referenced from SA header. 109 * - SAs that are in DEAD state will have (total external reference) 110 * in reference count field. they are ready to be freed. reference from 111 * SA header will be removed in key_delsav(), when the reference count 112 * field hits 0 (= no external reference other than from SA header. 113 */ 114 115VNET_DEFINE(u_int32_t, key_debug_level) = 0; 116static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 117#define V_key_spi_trycnt VNET(key_spi_trycnt) 118static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 119#define V_key_spi_minval VNET(key_spi_minval) 120static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 121#define V_key_spi_maxval VNET(key_spi_maxval) 122static VNET_DEFINE(u_int32_t, policy_id) = 0; 123#define V_policy_id VNET(policy_id) 124/*interval to initialize randseed,1(m)*/ 125static VNET_DEFINE(u_int, key_int_random) = 60; 126#define V_key_int_random VNET(key_int_random) 127/* interval to expire acquiring, 30(s)*/ 128static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 129#define V_key_larval_lifetime VNET(key_larval_lifetime) 130/* counter for blocking SADB_ACQUIRE.*/ 131static VNET_DEFINE(int, key_blockacq_count) = 10; 132#define V_key_blockacq_count VNET(key_blockacq_count) 133/* lifetime for blocking SADB_ACQUIRE.*/ 134static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 135#define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 136/* preferred old sa rather than new sa.*/ 137static VNET_DEFINE(int, key_preferred_oldsa) = 1; 138#define V_key_preferred_oldsa VNET(key_preferred_oldsa) 139 140static VNET_DEFINE(u_int32_t, acq_seq) = 0; 141#define V_acq_seq VNET(acq_seq) 142 143 /* SPD */ 144static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 145#define V_sptree VNET(sptree) 146static struct mtx sptree_lock; 147#define SPTREE_LOCK_INIT() \ 148 mtx_init(&sptree_lock, "sptree", \ 149 "fast ipsec security policy database", MTX_DEF) 150#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 151#define SPTREE_LOCK() mtx_lock(&sptree_lock) 152#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 153#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 154 155static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 156#define V_sahtree VNET(sahtree) 157static struct mtx sahtree_lock; 158#define SAHTREE_LOCK_INIT() \ 159 mtx_init(&sahtree_lock, "sahtree", \ 160 "fast ipsec security association database", MTX_DEF) 161#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 162#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 163#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 164#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 165 166 /* registed list */ 167static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 168#define V_regtree VNET(regtree) 169static struct mtx regtree_lock; 170#define REGTREE_LOCK_INIT() \ 171 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 172#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 173#define REGTREE_LOCK() mtx_lock(®tree_lock) 174#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 175#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 176 177static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 178#define V_acqtree VNET(acqtree) 179static struct mtx acq_lock; 180#define ACQ_LOCK_INIT() \ 181 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 182#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 183#define ACQ_LOCK() mtx_lock(&acq_lock) 184#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 185#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 186 187 /* SP acquiring list */ 188static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 189#define V_spacqtree VNET(spacqtree) 190static struct mtx spacq_lock; 191#define SPACQ_LOCK_INIT() \ 192 mtx_init(&spacq_lock, "spacqtree", \ 193 "fast ipsec security policy acquire list", MTX_DEF) 194#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 195#define SPACQ_LOCK() mtx_lock(&spacq_lock) 196#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 197#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 198 199/* search order for SAs */ 200static const u_int saorder_state_valid_prefer_old[] = { 201 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 202}; 203static const u_int saorder_state_valid_prefer_new[] = { 204 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 205}; 206static const u_int saorder_state_alive[] = { 207 /* except DEAD */ 208 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 209}; 210static const u_int saorder_state_any[] = { 211 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 212 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 213}; 214 215static const int minsize[] = { 216 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 217 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 220 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 221 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 223 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 224 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 225 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 226 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 227 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 228 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 229 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 230 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 231 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 232 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 233 0, /* SADB_X_EXT_KMPRIVATE */ 234 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 235 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 236 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 237 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 238 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 239 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 240 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 241 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 242}; 243static const int maxsize[] = { 244 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 245 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 246 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 248 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 249 0, /* SADB_EXT_ADDRESS_SRC */ 250 0, /* SADB_EXT_ADDRESS_DST */ 251 0, /* SADB_EXT_ADDRESS_PROXY */ 252 0, /* SADB_EXT_KEY_AUTH */ 253 0, /* SADB_EXT_KEY_ENCRYPT */ 254 0, /* SADB_EXT_IDENTITY_SRC */ 255 0, /* SADB_EXT_IDENTITY_DST */ 256 0, /* SADB_EXT_SENSITIVITY */ 257 0, /* SADB_EXT_PROPOSAL */ 258 0, /* SADB_EXT_SUPPORTED_AUTH */ 259 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 260 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 261 0, /* SADB_X_EXT_KMPRIVATE */ 262 0, /* SADB_X_EXT_POLICY */ 263 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 264 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 265 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 266 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 267 0, /* SADB_X_EXT_NAT_T_OAI */ 268 0, /* SADB_X_EXT_NAT_T_OAR */ 269 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 270}; 271 272static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 273#define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 274static VNET_DEFINE(int, ipsec_esp_auth) = 0; 275#define V_ipsec_esp_auth VNET(ipsec_esp_auth) 276static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 277#define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 278 279#ifdef SYSCTL_DECL 280SYSCTL_DECL(_net_key); 281#endif 282 283SYSCTL_VNET_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, 284 CTLFLAG_RW, &VNET_NAME(key_debug_level), 0, ""); 285 286/* max count of trial for the decision of spi value */ 287SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, 288 CTLFLAG_RW, &VNET_NAME(key_spi_trycnt), 0, ""); 289 290/* minimum spi value to allocate automatically. */ 291SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MIN_VALUE, 292 spi_minval, CTLFLAG_RW, &VNET_NAME(key_spi_minval), 0, ""); 293 294/* maximun spi value to allocate automatically. */ 295SYSCTL_VNET_INT(_net_key, KEYCTL_SPI_MAX_VALUE, 296 spi_maxval, CTLFLAG_RW, &VNET_NAME(key_spi_maxval), 0, ""); 297 298/* interval to initialize randseed */ 299SYSCTL_VNET_INT(_net_key, KEYCTL_RANDOM_INT, 300 int_random, CTLFLAG_RW, &VNET_NAME(key_int_random), 0, ""); 301 302/* lifetime for larval SA */ 303SYSCTL_VNET_INT(_net_key, KEYCTL_LARVAL_LIFETIME, 304 larval_lifetime, CTLFLAG_RW, &VNET_NAME(key_larval_lifetime), 0, ""); 305 306/* counter for blocking to send SADB_ACQUIRE to IKEd */ 307SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, 308 blockacq_count, CTLFLAG_RW, &VNET_NAME(key_blockacq_count), 0, ""); 309 310/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 311SYSCTL_VNET_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, 312 blockacq_lifetime, CTLFLAG_RW, &VNET_NAME(key_blockacq_lifetime), 0, ""); 313 314/* ESP auth */ 315SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, 316 CTLFLAG_RW, &VNET_NAME(ipsec_esp_auth), 0, ""); 317 318/* minimum ESP key length */ 319SYSCTL_VNET_INT(_net_key, KEYCTL_ESP_KEYMIN, 320 esp_keymin, CTLFLAG_RW, &VNET_NAME(ipsec_esp_keymin), 0, ""); 321 322/* minimum AH key length */ 323SYSCTL_VNET_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, 324 CTLFLAG_RW, &VNET_NAME(ipsec_ah_keymin), 0, ""); 325 326/* perfered old SA rather than new SA */ 327SYSCTL_VNET_INT(_net_key, KEYCTL_PREFERED_OLDSA, 328 preferred_oldsa, CTLFLAG_RW, &VNET_NAME(key_preferred_oldsa), 0, ""); 329 330#define __LIST_CHAINED(elm) \ 331 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 332#define LIST_INSERT_TAIL(head, elm, type, field) \ 333do {\ 334 struct type *curelm = LIST_FIRST(head); \ 335 if (curelm == NULL) {\ 336 LIST_INSERT_HEAD(head, elm, field); \ 337 } else { \ 338 while (LIST_NEXT(curelm, field)) \ 339 curelm = LIST_NEXT(curelm, field);\ 340 LIST_INSERT_AFTER(curelm, elm, field);\ 341 }\ 342} while (0) 343 344#define KEY_CHKSASTATE(head, sav, name) \ 345do { \ 346 if ((head) != (sav)) { \ 347 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 348 (name), (head), (sav))); \ 349 continue; \ 350 } \ 351} while (0) 352 353#define KEY_CHKSPDIR(head, sp, name) \ 354do { \ 355 if ((head) != (sp)) { \ 356 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 357 "anyway continue.\n", \ 358 (name), (head), (sp))); \ 359 } \ 360} while (0) 361 362MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 363MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 364MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 365MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 366MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 367MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 368MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 369 370/* 371 * set parameters into secpolicyindex buffer. 372 * Must allocate secpolicyindex buffer passed to this function. 373 */ 374#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 375do { \ 376 bzero((idx), sizeof(struct secpolicyindex)); \ 377 (idx)->dir = (_dir); \ 378 (idx)->prefs = (ps); \ 379 (idx)->prefd = (pd); \ 380 (idx)->ul_proto = (ulp); \ 381 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 382 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 383} while (0) 384 385/* 386 * set parameters into secasindex buffer. 387 * Must allocate secasindex buffer before calling this function. 388 */ 389#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 390do { \ 391 bzero((idx), sizeof(struct secasindex)); \ 392 (idx)->proto = (p); \ 393 (idx)->mode = (m); \ 394 (idx)->reqid = (r); \ 395 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 396 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 397} while (0) 398 399/* key statistics */ 400struct _keystat { 401 u_long getspi_count; /* the avarage of count to try to get new SPI */ 402} keystat; 403 404struct sadb_msghdr { 405 struct sadb_msg *msg; 406 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 407 int extoff[SADB_EXT_MAX + 1]; 408 int extlen[SADB_EXT_MAX + 1]; 409}; 410 411static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 412static void key_freesp_so __P((struct secpolicy **)); 413static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 414static void key_delsp __P((struct secpolicy *)); 415static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 416static void _key_delsp(struct secpolicy *sp); 417static struct secpolicy *key_getspbyid __P((u_int32_t)); 418static u_int32_t key_newreqid __P((void)); 419static struct mbuf *key_gather_mbuf __P((struct mbuf *, 420 const struct sadb_msghdr *, int, int, ...)); 421static int key_spdadd __P((struct socket *, struct mbuf *, 422 const struct sadb_msghdr *)); 423static u_int32_t key_getnewspid __P((void)); 424static int key_spddelete __P((struct socket *, struct mbuf *, 425 const struct sadb_msghdr *)); 426static int key_spddelete2 __P((struct socket *, struct mbuf *, 427 const struct sadb_msghdr *)); 428static int key_spdget __P((struct socket *, struct mbuf *, 429 const struct sadb_msghdr *)); 430static int key_spdflush __P((struct socket *, struct mbuf *, 431 const struct sadb_msghdr *)); 432static int key_spddump __P((struct socket *, struct mbuf *, 433 const struct sadb_msghdr *)); 434static struct mbuf *key_setdumpsp __P((struct secpolicy *, 435 u_int8_t, u_int32_t, u_int32_t)); 436static u_int key_getspreqmsglen __P((struct secpolicy *)); 437static int key_spdexpire __P((struct secpolicy *)); 438static struct secashead *key_newsah __P((struct secasindex *)); 439static void key_delsah __P((struct secashead *)); 440static struct secasvar *key_newsav __P((struct mbuf *, 441 const struct sadb_msghdr *, struct secashead *, int *, 442 const char*, int)); 443#define KEY_NEWSAV(m, sadb, sah, e) \ 444 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 445static void key_delsav __P((struct secasvar *)); 446static struct secashead *key_getsah __P((struct secasindex *)); 447static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 448static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 449static int key_setsaval __P((struct secasvar *, struct mbuf *, 450 const struct sadb_msghdr *)); 451static int key_mature __P((struct secasvar *)); 452static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 453 u_int8_t, u_int32_t, u_int32_t)); 454static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 455 u_int32_t, pid_t, u_int16_t)); 456static struct mbuf *key_setsadbsa __P((struct secasvar *)); 457static struct mbuf *key_setsadbaddr __P((u_int16_t, 458 const struct sockaddr *, u_int8_t, u_int16_t)); 459#ifdef IPSEC_NAT_T 460static struct mbuf *key_setsadbxport(u_int16_t, u_int16_t); 461static struct mbuf *key_setsadbxtype(u_int16_t); 462#endif 463static void key_porttosaddr(struct sockaddr *, u_int16_t); 464#define KEY_PORTTOSADDR(saddr, port) \ 465 key_porttosaddr((struct sockaddr *)(saddr), (port)) 466static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 467static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 468 u_int32_t)); 469static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 470 struct malloc_type *); 471static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 472 struct malloc_type *type); 473#ifdef INET6 474static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 475#endif 476 477/* flags for key_cmpsaidx() */ 478#define CMP_HEAD 1 /* protocol, addresses. */ 479#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 480#define CMP_REQID 3 /* additionally HEAD, reaid. */ 481#define CMP_EXACTLY 4 /* all elements. */ 482static int key_cmpsaidx 483 __P((const struct secasindex *, const struct secasindex *, int)); 484 485static int key_cmpspidx_exactly 486 __P((struct secpolicyindex *, struct secpolicyindex *)); 487static int key_cmpspidx_withmask 488 __P((struct secpolicyindex *, struct secpolicyindex *)); 489static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 490static int key_bbcmp __P((const void *, const void *, u_int)); 491static u_int16_t key_satype2proto __P((u_int8_t)); 492static u_int8_t key_proto2satype __P((u_int16_t)); 493 494static int key_getspi __P((struct socket *, struct mbuf *, 495 const struct sadb_msghdr *)); 496static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 497 struct secasindex *)); 498static int key_update __P((struct socket *, struct mbuf *, 499 const struct sadb_msghdr *)); 500#ifdef IPSEC_DOSEQCHECK 501static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 502#endif 503static int key_add __P((struct socket *, struct mbuf *, 504 const struct sadb_msghdr *)); 505static int key_setident __P((struct secashead *, struct mbuf *, 506 const struct sadb_msghdr *)); 507static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 508 const struct sadb_msghdr *)); 509static int key_delete __P((struct socket *, struct mbuf *, 510 const struct sadb_msghdr *)); 511static int key_get __P((struct socket *, struct mbuf *, 512 const struct sadb_msghdr *)); 513 514static void key_getcomb_setlifetime __P((struct sadb_comb *)); 515static struct mbuf *key_getcomb_esp __P((void)); 516static struct mbuf *key_getcomb_ah __P((void)); 517static struct mbuf *key_getcomb_ipcomp __P((void)); 518static struct mbuf *key_getprop __P((const struct secasindex *)); 519 520static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 521static struct secacq *key_newacq __P((const struct secasindex *)); 522static struct secacq *key_getacq __P((const struct secasindex *)); 523static struct secacq *key_getacqbyseq __P((u_int32_t)); 524static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 525static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 526static int key_acquire2 __P((struct socket *, struct mbuf *, 527 const struct sadb_msghdr *)); 528static int key_register __P((struct socket *, struct mbuf *, 529 const struct sadb_msghdr *)); 530static int key_expire __P((struct secasvar *)); 531static int key_flush __P((struct socket *, struct mbuf *, 532 const struct sadb_msghdr *)); 533static int key_dump __P((struct socket *, struct mbuf *, 534 const struct sadb_msghdr *)); 535static int key_promisc __P((struct socket *, struct mbuf *, 536 const struct sadb_msghdr *)); 537static int key_senderror __P((struct socket *, struct mbuf *, int)); 538static int key_validate_ext __P((const struct sadb_ext *, int)); 539static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 540static struct mbuf *key_setlifetime(struct seclifetime *src, 541 u_int16_t exttype); 542static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 543 544#if 0 545static const char *key_getfqdn __P((void)); 546static const char *key_getuserfqdn __P((void)); 547#endif 548static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 549static struct mbuf *key_alloc_mbuf __P((int)); 550 551static __inline void 552sa_initref(struct secasvar *sav) 553{ 554 555 refcount_init(&sav->refcnt, 1); 556} 557static __inline void 558sa_addref(struct secasvar *sav) 559{ 560 561 refcount_acquire(&sav->refcnt); 562 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 563} 564static __inline int 565sa_delref(struct secasvar *sav) 566{ 567 568 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 569 return (refcount_release(&sav->refcnt)); 570} 571 572#define SP_ADDREF(p) do { \ 573 (p)->refcnt++; \ 574 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 575} while (0) 576#define SP_DELREF(p) do { \ 577 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 578 (p)->refcnt--; \ 579} while (0) 580 581 582/* 583 * Update the refcnt while holding the SPTREE lock. 584 */ 585void 586key_addref(struct secpolicy *sp) 587{ 588 SPTREE_LOCK(); 589 SP_ADDREF(sp); 590 SPTREE_UNLOCK(); 591} 592 593/* 594 * Return 0 when there are known to be no SP's for the specified 595 * direction. Otherwise return 1. This is used by IPsec code 596 * to optimize performance. 597 */ 598int 599key_havesp(u_int dir) 600{ 601 602 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 603 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 604} 605 606/* %%% IPsec policy management */ 607/* 608 * allocating a SP for OUTBOUND or INBOUND packet. 609 * Must call key_freesp() later. 610 * OUT: NULL: not found 611 * others: found and return the pointer. 612 */ 613struct secpolicy * 614key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 615{ 616 struct secpolicy *sp; 617 618 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 619 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 620 ("invalid direction %u", dir)); 621 622 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 623 printf("DP %s from %s:%u\n", __func__, where, tag)); 624 625 /* get a SP entry */ 626 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 627 printf("*** objects\n"); 628 kdebug_secpolicyindex(spidx)); 629 630 SPTREE_LOCK(); 631 LIST_FOREACH(sp, &V_sptree[dir], chain) { 632 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 633 printf("*** in SPD\n"); 634 kdebug_secpolicyindex(&sp->spidx)); 635 636 if (sp->state == IPSEC_SPSTATE_DEAD) 637 continue; 638 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 639 goto found; 640 } 641 sp = NULL; 642found: 643 if (sp) { 644 /* sanity check */ 645 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 646 647 /* found a SPD entry */ 648 sp->lastused = time_second; 649 SP_ADDREF(sp); 650 } 651 SPTREE_UNLOCK(); 652 653 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 654 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 655 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 656 return sp; 657} 658 659/* 660 * allocating a SP for OUTBOUND or INBOUND packet. 661 * Must call key_freesp() later. 662 * OUT: NULL: not found 663 * others: found and return the pointer. 664 */ 665struct secpolicy * 666key_allocsp2(u_int32_t spi, 667 union sockaddr_union *dst, 668 u_int8_t proto, 669 u_int dir, 670 const char* where, int tag) 671{ 672 struct secpolicy *sp; 673 674 IPSEC_ASSERT(dst != NULL, ("null dst")); 675 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 676 ("invalid direction %u", dir)); 677 678 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 679 printf("DP %s from %s:%u\n", __func__, where, tag)); 680 681 /* get a SP entry */ 682 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 683 printf("*** objects\n"); 684 printf("spi %u proto %u dir %u\n", spi, proto, dir); 685 kdebug_sockaddr(&dst->sa)); 686 687 SPTREE_LOCK(); 688 LIST_FOREACH(sp, &V_sptree[dir], chain) { 689 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 690 printf("*** in SPD\n"); 691 kdebug_secpolicyindex(&sp->spidx)); 692 693 if (sp->state == IPSEC_SPSTATE_DEAD) 694 continue; 695 /* compare simple values, then dst address */ 696 if (sp->spidx.ul_proto != proto) 697 continue; 698 /* NB: spi's must exist and match */ 699 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 700 continue; 701 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 702 goto found; 703 } 704 sp = NULL; 705found: 706 if (sp) { 707 /* sanity check */ 708 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 709 710 /* found a SPD entry */ 711 sp->lastused = time_second; 712 SP_ADDREF(sp); 713 } 714 SPTREE_UNLOCK(); 715 716 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 717 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 718 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 719 return sp; 720} 721 722#if 0 723/* 724 * return a policy that matches this particular inbound packet. 725 * XXX slow 726 */ 727struct secpolicy * 728key_gettunnel(const struct sockaddr *osrc, 729 const struct sockaddr *odst, 730 const struct sockaddr *isrc, 731 const struct sockaddr *idst, 732 const char* where, int tag) 733{ 734 struct secpolicy *sp; 735 const int dir = IPSEC_DIR_INBOUND; 736 struct ipsecrequest *r1, *r2, *p; 737 struct secpolicyindex spidx; 738 739 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 740 printf("DP %s from %s:%u\n", __func__, where, tag)); 741 742 if (isrc->sa_family != idst->sa_family) { 743 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 744 __func__, isrc->sa_family, idst->sa_family)); 745 sp = NULL; 746 goto done; 747 } 748 749 SPTREE_LOCK(); 750 LIST_FOREACH(sp, &V_sptree[dir], chain) { 751 if (sp->state == IPSEC_SPSTATE_DEAD) 752 continue; 753 754 r1 = r2 = NULL; 755 for (p = sp->req; p; p = p->next) { 756 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 757 continue; 758 759 r1 = r2; 760 r2 = p; 761 762 if (!r1) { 763 /* here we look at address matches only */ 764 spidx = sp->spidx; 765 if (isrc->sa_len > sizeof(spidx.src) || 766 idst->sa_len > sizeof(spidx.dst)) 767 continue; 768 bcopy(isrc, &spidx.src, isrc->sa_len); 769 bcopy(idst, &spidx.dst, idst->sa_len); 770 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 771 continue; 772 } else { 773 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 774 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 775 continue; 776 } 777 778 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 779 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 780 continue; 781 782 goto found; 783 } 784 } 785 sp = NULL; 786found: 787 if (sp) { 788 sp->lastused = time_second; 789 SP_ADDREF(sp); 790 } 791 SPTREE_UNLOCK(); 792done: 793 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 794 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 795 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 796 return sp; 797} 798#endif 799 800/* 801 * allocating an SA entry for an *OUTBOUND* packet. 802 * checking each request entries in SP, and acquire an SA if need. 803 * OUT: 0: there are valid requests. 804 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 805 */ 806int 807key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 808{ 809 u_int level; 810 int error; 811 812 IPSEC_ASSERT(isr != NULL, ("null isr")); 813 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 814 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 815 saidx->mode == IPSEC_MODE_TUNNEL, 816 ("unexpected policy %u", saidx->mode)); 817 818 /* 819 * XXX guard against protocol callbacks from the crypto 820 * thread as they reference ipsecrequest.sav which we 821 * temporarily null out below. Need to rethink how we 822 * handle bundled SA's in the callback thread. 823 */ 824 IPSECREQUEST_LOCK_ASSERT(isr); 825 826 /* get current level */ 827 level = ipsec_get_reqlevel(isr); 828#if 0 829 /* 830 * We do allocate new SA only if the state of SA in the holder is 831 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 832 */ 833 if (isr->sav != NULL) { 834 if (isr->sav->sah == NULL) 835 panic("%s: sah is null.\n", __func__); 836 if (isr->sav == (struct secasvar *)LIST_FIRST( 837 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 838 KEY_FREESAV(&isr->sav); 839 isr->sav = NULL; 840 } 841 } 842#else 843 /* 844 * we free any SA stashed in the IPsec request because a different 845 * SA may be involved each time this request is checked, either 846 * because new SAs are being configured, or this request is 847 * associated with an unconnected datagram socket, or this request 848 * is associated with a system default policy. 849 * 850 * The operation may have negative impact to performance. We may 851 * want to check cached SA carefully, rather than picking new SA 852 * every time. 853 */ 854 if (isr->sav != NULL) { 855 KEY_FREESAV(&isr->sav); 856 isr->sav = NULL; 857 } 858#endif 859 860 /* 861 * new SA allocation if no SA found. 862 * key_allocsa_policy should allocate the oldest SA available. 863 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 864 */ 865 if (isr->sav == NULL) 866 isr->sav = key_allocsa_policy(saidx); 867 868 /* When there is SA. */ 869 if (isr->sav != NULL) { 870 if (isr->sav->state != SADB_SASTATE_MATURE && 871 isr->sav->state != SADB_SASTATE_DYING) 872 return EINVAL; 873 return 0; 874 } 875 876 /* there is no SA */ 877 error = key_acquire(saidx, isr->sp); 878 if (error != 0) { 879 /* XXX What should I do ? */ 880 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 881 __func__, error)); 882 return error; 883 } 884 885 if (level != IPSEC_LEVEL_REQUIRE) { 886 /* XXX sigh, the interface to this routine is botched */ 887 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 888 return 0; 889 } else { 890 return ENOENT; 891 } 892} 893 894/* 895 * allocating a SA for policy entry from SAD. 896 * NOTE: searching SAD of aliving state. 897 * OUT: NULL: not found. 898 * others: found and return the pointer. 899 */ 900static struct secasvar * 901key_allocsa_policy(const struct secasindex *saidx) 902{ 903#define N(a) _ARRAYLEN(a) 904 struct secashead *sah; 905 struct secasvar *sav; 906 u_int stateidx, arraysize; 907 const u_int *state_valid; 908 909 SAHTREE_LOCK(); 910 LIST_FOREACH(sah, &V_sahtree, chain) { 911 if (sah->state == SADB_SASTATE_DEAD) 912 continue; 913 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 914 if (V_key_preferred_oldsa) { 915 state_valid = saorder_state_valid_prefer_old; 916 arraysize = N(saorder_state_valid_prefer_old); 917 } else { 918 state_valid = saorder_state_valid_prefer_new; 919 arraysize = N(saorder_state_valid_prefer_new); 920 } 921 break; 922 } 923 } 924 SAHTREE_UNLOCK(); 925 926 if (sah == NULL) 927 return NULL; 928 929 /* search valid state */ 930 for (stateidx = 0; stateidx < arraysize; stateidx++) { 931 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 932 if (sav != NULL) 933 return sav; 934 } 935 936 return NULL; 937#undef N 938} 939 940/* 941 * searching SAD with direction, protocol, mode and state. 942 * called by key_allocsa_policy(). 943 * OUT: 944 * NULL : not found 945 * others : found, pointer to a SA. 946 */ 947static struct secasvar * 948key_do_allocsa_policy(struct secashead *sah, u_int state) 949{ 950 struct secasvar *sav, *nextsav, *candidate, *d; 951 952 /* initilize */ 953 candidate = NULL; 954 955 SAHTREE_LOCK(); 956 for (sav = LIST_FIRST(&sah->savtree[state]); 957 sav != NULL; 958 sav = nextsav) { 959 960 nextsav = LIST_NEXT(sav, chain); 961 962 /* sanity check */ 963 KEY_CHKSASTATE(sav->state, state, __func__); 964 965 /* initialize */ 966 if (candidate == NULL) { 967 candidate = sav; 968 continue; 969 } 970 971 /* Which SA is the better ? */ 972 973 IPSEC_ASSERT(candidate->lft_c != NULL, 974 ("null candidate lifetime")); 975 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 976 977 /* What the best method is to compare ? */ 978 if (V_key_preferred_oldsa) { 979 if (candidate->lft_c->addtime > 980 sav->lft_c->addtime) { 981 candidate = sav; 982 } 983 continue; 984 /*NOTREACHED*/ 985 } 986 987 /* preferred new sa rather than old sa */ 988 if (candidate->lft_c->addtime < 989 sav->lft_c->addtime) { 990 d = candidate; 991 candidate = sav; 992 } else 993 d = sav; 994 995 /* 996 * prepared to delete the SA when there is more 997 * suitable candidate and the lifetime of the SA is not 998 * permanent. 999 */ 1000 if (d->lft_h->addtime != 0) { 1001 struct mbuf *m, *result; 1002 u_int8_t satype; 1003 1004 key_sa_chgstate(d, SADB_SASTATE_DEAD); 1005 1006 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 1007 1008 satype = key_proto2satype(d->sah->saidx.proto); 1009 if (satype == 0) 1010 goto msgfail; 1011 1012 m = key_setsadbmsg(SADB_DELETE, 0, 1013 satype, 0, 0, d->refcnt - 1); 1014 if (!m) 1015 goto msgfail; 1016 result = m; 1017 1018 /* set sadb_address for saidx's. */ 1019 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1020 &d->sah->saidx.src.sa, 1021 d->sah->saidx.src.sa.sa_len << 3, 1022 IPSEC_ULPROTO_ANY); 1023 if (!m) 1024 goto msgfail; 1025 m_cat(result, m); 1026 1027 /* set sadb_address for saidx's. */ 1028 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1029 &d->sah->saidx.dst.sa, 1030 d->sah->saidx.dst.sa.sa_len << 3, 1031 IPSEC_ULPROTO_ANY); 1032 if (!m) 1033 goto msgfail; 1034 m_cat(result, m); 1035 1036 /* create SA extension */ 1037 m = key_setsadbsa(d); 1038 if (!m) 1039 goto msgfail; 1040 m_cat(result, m); 1041 1042 if (result->m_len < sizeof(struct sadb_msg)) { 1043 result = m_pullup(result, 1044 sizeof(struct sadb_msg)); 1045 if (result == NULL) 1046 goto msgfail; 1047 } 1048 1049 result->m_pkthdr.len = 0; 1050 for (m = result; m; m = m->m_next) 1051 result->m_pkthdr.len += m->m_len; 1052 mtod(result, struct sadb_msg *)->sadb_msg_len = 1053 PFKEY_UNIT64(result->m_pkthdr.len); 1054 1055 if (key_sendup_mbuf(NULL, result, 1056 KEY_SENDUP_REGISTERED)) 1057 goto msgfail; 1058 msgfail: 1059 KEY_FREESAV(&d); 1060 } 1061 } 1062 if (candidate) { 1063 sa_addref(candidate); 1064 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1065 printf("DP %s cause refcnt++:%d SA:%p\n", 1066 __func__, candidate->refcnt, candidate)); 1067 } 1068 SAHTREE_UNLOCK(); 1069 1070 return candidate; 1071} 1072 1073/* 1074 * allocating a usable SA entry for a *INBOUND* packet. 1075 * Must call key_freesav() later. 1076 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1077 * NULL: not found, or error occured. 1078 * 1079 * In the comparison, no source address is used--for RFC2401 conformance. 1080 * To quote, from section 4.1: 1081 * A security association is uniquely identified by a triple consisting 1082 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1083 * security protocol (AH or ESP) identifier. 1084 * Note that, however, we do need to keep source address in IPsec SA. 1085 * IKE specification and PF_KEY specification do assume that we 1086 * keep source address in IPsec SA. We see a tricky situation here. 1087 */ 1088struct secasvar * 1089key_allocsa( 1090 union sockaddr_union *dst, 1091 u_int proto, 1092 u_int32_t spi, 1093 const char* where, int tag) 1094{ 1095 struct secashead *sah; 1096 struct secasvar *sav; 1097 u_int stateidx, arraysize, state; 1098 const u_int *saorder_state_valid; 1099 int chkport; 1100 1101 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1102 1103 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1104 printf("DP %s from %s:%u\n", __func__, where, tag)); 1105 1106#ifdef IPSEC_NAT_T 1107 chkport = (dst->sa.sa_family == AF_INET && 1108 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1109 dst->sin.sin_port != 0); 1110#else 1111 chkport = 0; 1112#endif 1113 1114 /* 1115 * searching SAD. 1116 * XXX: to be checked internal IP header somewhere. Also when 1117 * IPsec tunnel packet is received. But ESP tunnel mode is 1118 * encrypted so we can't check internal IP header. 1119 */ 1120 SAHTREE_LOCK(); 1121 if (V_key_preferred_oldsa) { 1122 saorder_state_valid = saorder_state_valid_prefer_old; 1123 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1124 } else { 1125 saorder_state_valid = saorder_state_valid_prefer_new; 1126 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1127 } 1128 LIST_FOREACH(sah, &V_sahtree, chain) { 1129 /* search valid state */ 1130 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1131 state = saorder_state_valid[stateidx]; 1132 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1133 /* sanity check */ 1134 KEY_CHKSASTATE(sav->state, state, __func__); 1135 /* do not return entries w/ unusable state */ 1136 if (sav->state != SADB_SASTATE_MATURE && 1137 sav->state != SADB_SASTATE_DYING) 1138 continue; 1139 if (proto != sav->sah->saidx.proto) 1140 continue; 1141 if (spi != sav->spi) 1142 continue; 1143#if 0 /* don't check src */ 1144 /* check src address */ 1145 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, chkport) != 0) 1146 continue; 1147#endif 1148 /* check dst address */ 1149 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, chkport) != 0) 1150 continue; 1151 sa_addref(sav); 1152 goto done; 1153 } 1154 } 1155 } 1156 sav = NULL; 1157done: 1158 SAHTREE_UNLOCK(); 1159 1160 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1161 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1162 sav, sav ? sav->refcnt : 0)); 1163 return sav; 1164} 1165 1166/* 1167 * Must be called after calling key_allocsp(). 1168 * For both the packet without socket and key_freeso(). 1169 */ 1170void 1171_key_freesp(struct secpolicy **spp, const char* where, int tag) 1172{ 1173 struct secpolicy *sp = *spp; 1174 1175 IPSEC_ASSERT(sp != NULL, ("null sp")); 1176 1177 SPTREE_LOCK(); 1178 SP_DELREF(sp); 1179 1180 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1181 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1182 __func__, sp, sp->id, where, tag, sp->refcnt)); 1183 1184 if (sp->refcnt == 0) { 1185 *spp = NULL; 1186 key_delsp(sp); 1187 } 1188 SPTREE_UNLOCK(); 1189} 1190 1191/* 1192 * Must be called after calling key_allocsp(). 1193 * For the packet with socket. 1194 */ 1195void 1196key_freeso(struct socket *so) 1197{ 1198 IPSEC_ASSERT(so != NULL, ("null so")); 1199 1200 switch (so->so_proto->pr_domain->dom_family) { 1201#if defined(INET) || defined(INET6) 1202#ifdef INET 1203 case PF_INET: 1204#endif 1205#ifdef INET6 1206 case PF_INET6: 1207#endif 1208 { 1209 struct inpcb *pcb = sotoinpcb(so); 1210 1211 /* Does it have a PCB ? */ 1212 if (pcb == NULL) 1213 return; 1214 key_freesp_so(&pcb->inp_sp->sp_in); 1215 key_freesp_so(&pcb->inp_sp->sp_out); 1216 } 1217 break; 1218#endif /* INET || INET6 */ 1219 default: 1220 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1221 __func__, so->so_proto->pr_domain->dom_family)); 1222 return; 1223 } 1224} 1225 1226static void 1227key_freesp_so(struct secpolicy **sp) 1228{ 1229 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1230 1231 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1232 (*sp)->policy == IPSEC_POLICY_BYPASS) 1233 return; 1234 1235 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1236 ("invalid policy %u", (*sp)->policy)); 1237 KEY_FREESP(sp); 1238} 1239 1240/* 1241 * Must be called after calling key_allocsa(). 1242 * This function is called by key_freesp() to free some SA allocated 1243 * for a policy. 1244 */ 1245void 1246key_freesav(struct secasvar **psav, const char* where, int tag) 1247{ 1248 struct secasvar *sav = *psav; 1249 1250 IPSEC_ASSERT(sav != NULL, ("null sav")); 1251 1252 if (sa_delref(sav)) { 1253 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1254 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1255 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1256 *psav = NULL; 1257 key_delsav(sav); 1258 } else { 1259 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1260 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1261 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1262 } 1263} 1264 1265/* %%% SPD management */ 1266/* 1267 * free security policy entry. 1268 */ 1269static void 1270key_delsp(struct secpolicy *sp) 1271{ 1272 struct ipsecrequest *isr, *nextisr; 1273 1274 IPSEC_ASSERT(sp != NULL, ("null sp")); 1275 SPTREE_LOCK_ASSERT(); 1276 1277 sp->state = IPSEC_SPSTATE_DEAD; 1278 1279 IPSEC_ASSERT(sp->refcnt == 0, 1280 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1281 1282 /* remove from SP index */ 1283 if (__LIST_CHAINED(sp)) 1284 LIST_REMOVE(sp, chain); 1285 1286 for (isr = sp->req; isr != NULL; isr = nextisr) { 1287 if (isr->sav != NULL) { 1288 KEY_FREESAV(&isr->sav); 1289 isr->sav = NULL; 1290 } 1291 1292 nextisr = isr->next; 1293 ipsec_delisr(isr); 1294 } 1295 _key_delsp(sp); 1296} 1297 1298/* 1299 * search SPD 1300 * OUT: NULL : not found 1301 * others : found, pointer to a SP. 1302 */ 1303static struct secpolicy * 1304key_getsp(struct secpolicyindex *spidx) 1305{ 1306 struct secpolicy *sp; 1307 1308 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1309 1310 SPTREE_LOCK(); 1311 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1312 if (sp->state == IPSEC_SPSTATE_DEAD) 1313 continue; 1314 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1315 SP_ADDREF(sp); 1316 break; 1317 } 1318 } 1319 SPTREE_UNLOCK(); 1320 1321 return sp; 1322} 1323 1324/* 1325 * get SP by index. 1326 * OUT: NULL : not found 1327 * others : found, pointer to a SP. 1328 */ 1329static struct secpolicy * 1330key_getspbyid(u_int32_t id) 1331{ 1332 struct secpolicy *sp; 1333 1334 SPTREE_LOCK(); 1335 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1336 if (sp->state == IPSEC_SPSTATE_DEAD) 1337 continue; 1338 if (sp->id == id) { 1339 SP_ADDREF(sp); 1340 goto done; 1341 } 1342 } 1343 1344 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1345 if (sp->state == IPSEC_SPSTATE_DEAD) 1346 continue; 1347 if (sp->id == id) { 1348 SP_ADDREF(sp); 1349 goto done; 1350 } 1351 } 1352done: 1353 SPTREE_UNLOCK(); 1354 1355 return sp; 1356} 1357 1358struct secpolicy * 1359key_newsp(const char* where, int tag) 1360{ 1361 struct secpolicy *newsp = NULL; 1362 1363 newsp = (struct secpolicy *) 1364 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1365 if (newsp) { 1366 SECPOLICY_LOCK_INIT(newsp); 1367 newsp->refcnt = 1; 1368 newsp->req = NULL; 1369 } 1370 1371 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1372 printf("DP %s from %s:%u return SP:%p\n", __func__, 1373 where, tag, newsp)); 1374 return newsp; 1375} 1376 1377static void 1378_key_delsp(struct secpolicy *sp) 1379{ 1380 SECPOLICY_LOCK_DESTROY(sp); 1381 free(sp, M_IPSEC_SP); 1382} 1383 1384/* 1385 * create secpolicy structure from sadb_x_policy structure. 1386 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1387 * so must be set properly later. 1388 */ 1389struct secpolicy * 1390key_msg2sp(xpl0, len, error) 1391 struct sadb_x_policy *xpl0; 1392 size_t len; 1393 int *error; 1394{ 1395 struct secpolicy *newsp; 1396 1397 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1398 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1399 1400 if (len != PFKEY_EXTLEN(xpl0)) { 1401 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1402 *error = EINVAL; 1403 return NULL; 1404 } 1405 1406 if ((newsp = KEY_NEWSP()) == NULL) { 1407 *error = ENOBUFS; 1408 return NULL; 1409 } 1410 1411 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1412 newsp->policy = xpl0->sadb_x_policy_type; 1413 1414 /* check policy */ 1415 switch (xpl0->sadb_x_policy_type) { 1416 case IPSEC_POLICY_DISCARD: 1417 case IPSEC_POLICY_NONE: 1418 case IPSEC_POLICY_ENTRUST: 1419 case IPSEC_POLICY_BYPASS: 1420 newsp->req = NULL; 1421 break; 1422 1423 case IPSEC_POLICY_IPSEC: 1424 { 1425 int tlen; 1426 struct sadb_x_ipsecrequest *xisr; 1427 struct ipsecrequest **p_isr = &newsp->req; 1428 1429 /* validity check */ 1430 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1431 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1432 __func__)); 1433 KEY_FREESP(&newsp); 1434 *error = EINVAL; 1435 return NULL; 1436 } 1437 1438 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1439 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1440 1441 while (tlen > 0) { 1442 /* length check */ 1443 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1444 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1445 "length.\n", __func__)); 1446 KEY_FREESP(&newsp); 1447 *error = EINVAL; 1448 return NULL; 1449 } 1450 1451 /* allocate request buffer */ 1452 /* NB: data structure is zero'd */ 1453 *p_isr = ipsec_newisr(); 1454 if ((*p_isr) == NULL) { 1455 ipseclog((LOG_DEBUG, 1456 "%s: No more memory.\n", __func__)); 1457 KEY_FREESP(&newsp); 1458 *error = ENOBUFS; 1459 return NULL; 1460 } 1461 1462 /* set values */ 1463 switch (xisr->sadb_x_ipsecrequest_proto) { 1464 case IPPROTO_ESP: 1465 case IPPROTO_AH: 1466 case IPPROTO_IPCOMP: 1467 break; 1468 default: 1469 ipseclog((LOG_DEBUG, 1470 "%s: invalid proto type=%u\n", __func__, 1471 xisr->sadb_x_ipsecrequest_proto)); 1472 KEY_FREESP(&newsp); 1473 *error = EPROTONOSUPPORT; 1474 return NULL; 1475 } 1476 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1477 1478 switch (xisr->sadb_x_ipsecrequest_mode) { 1479 case IPSEC_MODE_TRANSPORT: 1480 case IPSEC_MODE_TUNNEL: 1481 break; 1482 case IPSEC_MODE_ANY: 1483 default: 1484 ipseclog((LOG_DEBUG, 1485 "%s: invalid mode=%u\n", __func__, 1486 xisr->sadb_x_ipsecrequest_mode)); 1487 KEY_FREESP(&newsp); 1488 *error = EINVAL; 1489 return NULL; 1490 } 1491 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1492 1493 switch (xisr->sadb_x_ipsecrequest_level) { 1494 case IPSEC_LEVEL_DEFAULT: 1495 case IPSEC_LEVEL_USE: 1496 case IPSEC_LEVEL_REQUIRE: 1497 break; 1498 case IPSEC_LEVEL_UNIQUE: 1499 /* validity check */ 1500 /* 1501 * If range violation of reqid, kernel will 1502 * update it, don't refuse it. 1503 */ 1504 if (xisr->sadb_x_ipsecrequest_reqid 1505 > IPSEC_MANUAL_REQID_MAX) { 1506 ipseclog((LOG_DEBUG, 1507 "%s: reqid=%d range " 1508 "violation, updated by kernel.\n", 1509 __func__, 1510 xisr->sadb_x_ipsecrequest_reqid)); 1511 xisr->sadb_x_ipsecrequest_reqid = 0; 1512 } 1513 1514 /* allocate new reqid id if reqid is zero. */ 1515 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1516 u_int32_t reqid; 1517 if ((reqid = key_newreqid()) == 0) { 1518 KEY_FREESP(&newsp); 1519 *error = ENOBUFS; 1520 return NULL; 1521 } 1522 (*p_isr)->saidx.reqid = reqid; 1523 xisr->sadb_x_ipsecrequest_reqid = reqid; 1524 } else { 1525 /* set it for manual keying. */ 1526 (*p_isr)->saidx.reqid = 1527 xisr->sadb_x_ipsecrequest_reqid; 1528 } 1529 break; 1530 1531 default: 1532 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1533 __func__, 1534 xisr->sadb_x_ipsecrequest_level)); 1535 KEY_FREESP(&newsp); 1536 *error = EINVAL; 1537 return NULL; 1538 } 1539 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1540 1541 /* set IP addresses if there */ 1542 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1543 struct sockaddr *paddr; 1544 1545 paddr = (struct sockaddr *)(xisr + 1); 1546 1547 /* validity check */ 1548 if (paddr->sa_len 1549 > sizeof((*p_isr)->saidx.src)) { 1550 ipseclog((LOG_DEBUG, "%s: invalid " 1551 "request address length.\n", 1552 __func__)); 1553 KEY_FREESP(&newsp); 1554 *error = EINVAL; 1555 return NULL; 1556 } 1557 bcopy(paddr, &(*p_isr)->saidx.src, 1558 paddr->sa_len); 1559 1560 paddr = (struct sockaddr *)((caddr_t)paddr 1561 + paddr->sa_len); 1562 1563 /* validity check */ 1564 if (paddr->sa_len 1565 > sizeof((*p_isr)->saidx.dst)) { 1566 ipseclog((LOG_DEBUG, "%s: invalid " 1567 "request address length.\n", 1568 __func__)); 1569 KEY_FREESP(&newsp); 1570 *error = EINVAL; 1571 return NULL; 1572 } 1573 bcopy(paddr, &(*p_isr)->saidx.dst, 1574 paddr->sa_len); 1575 } 1576 1577 (*p_isr)->sp = newsp; 1578 1579 /* initialization for the next. */ 1580 p_isr = &(*p_isr)->next; 1581 tlen -= xisr->sadb_x_ipsecrequest_len; 1582 1583 /* validity check */ 1584 if (tlen < 0) { 1585 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1586 __func__)); 1587 KEY_FREESP(&newsp); 1588 *error = EINVAL; 1589 return NULL; 1590 } 1591 1592 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1593 + xisr->sadb_x_ipsecrequest_len); 1594 } 1595 } 1596 break; 1597 default: 1598 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1599 KEY_FREESP(&newsp); 1600 *error = EINVAL; 1601 return NULL; 1602 } 1603 1604 *error = 0; 1605 return newsp; 1606} 1607 1608static u_int32_t 1609key_newreqid() 1610{ 1611 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1612 1613 auto_reqid = (auto_reqid == ~0 1614 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1615 1616 /* XXX should be unique check */ 1617 1618 return auto_reqid; 1619} 1620 1621/* 1622 * copy secpolicy struct to sadb_x_policy structure indicated. 1623 */ 1624struct mbuf * 1625key_sp2msg(sp) 1626 struct secpolicy *sp; 1627{ 1628 struct sadb_x_policy *xpl; 1629 int tlen; 1630 caddr_t p; 1631 struct mbuf *m; 1632 1633 IPSEC_ASSERT(sp != NULL, ("null policy")); 1634 1635 tlen = key_getspreqmsglen(sp); 1636 1637 m = key_alloc_mbuf(tlen); 1638 if (!m || m->m_next) { /*XXX*/ 1639 if (m) 1640 m_freem(m); 1641 return NULL; 1642 } 1643 1644 m->m_len = tlen; 1645 m->m_next = NULL; 1646 xpl = mtod(m, struct sadb_x_policy *); 1647 bzero(xpl, tlen); 1648 1649 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1650 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1651 xpl->sadb_x_policy_type = sp->policy; 1652 xpl->sadb_x_policy_dir = sp->spidx.dir; 1653 xpl->sadb_x_policy_id = sp->id; 1654 p = (caddr_t)xpl + sizeof(*xpl); 1655 1656 /* if is the policy for ipsec ? */ 1657 if (sp->policy == IPSEC_POLICY_IPSEC) { 1658 struct sadb_x_ipsecrequest *xisr; 1659 struct ipsecrequest *isr; 1660 1661 for (isr = sp->req; isr != NULL; isr = isr->next) { 1662 1663 xisr = (struct sadb_x_ipsecrequest *)p; 1664 1665 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1666 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1667 xisr->sadb_x_ipsecrequest_level = isr->level; 1668 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1669 1670 p += sizeof(*xisr); 1671 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1672 p += isr->saidx.src.sa.sa_len; 1673 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1674 p += isr->saidx.src.sa.sa_len; 1675 1676 xisr->sadb_x_ipsecrequest_len = 1677 PFKEY_ALIGN8(sizeof(*xisr) 1678 + isr->saidx.src.sa.sa_len 1679 + isr->saidx.dst.sa.sa_len); 1680 } 1681 } 1682 1683 return m; 1684} 1685 1686/* m will not be freed nor modified */ 1687static struct mbuf * 1688#ifdef __STDC__ 1689key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1690 int ndeep, int nitem, ...) 1691#else 1692key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1693 struct mbuf *m; 1694 const struct sadb_msghdr *mhp; 1695 int ndeep; 1696 int nitem; 1697 va_dcl 1698#endif 1699{ 1700 va_list ap; 1701 int idx; 1702 int i; 1703 struct mbuf *result = NULL, *n; 1704 int len; 1705 1706 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1707 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1708 1709 va_start(ap, nitem); 1710 for (i = 0; i < nitem; i++) { 1711 idx = va_arg(ap, int); 1712 if (idx < 0 || idx > SADB_EXT_MAX) 1713 goto fail; 1714 /* don't attempt to pull empty extension */ 1715 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1716 continue; 1717 if (idx != SADB_EXT_RESERVED && 1718 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1719 continue; 1720 1721 if (idx == SADB_EXT_RESERVED) { 1722 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1723 1724 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1725 1726 MGETHDR(n, M_DONTWAIT, MT_DATA); 1727 if (!n) 1728 goto fail; 1729 n->m_len = len; 1730 n->m_next = NULL; 1731 m_copydata(m, 0, sizeof(struct sadb_msg), 1732 mtod(n, caddr_t)); 1733 } else if (i < ndeep) { 1734 len = mhp->extlen[idx]; 1735 n = key_alloc_mbuf(len); 1736 if (!n || n->m_next) { /*XXX*/ 1737 if (n) 1738 m_freem(n); 1739 goto fail; 1740 } 1741 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1742 mtod(n, caddr_t)); 1743 } else { 1744 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1745 M_DONTWAIT); 1746 } 1747 if (n == NULL) 1748 goto fail; 1749 1750 if (result) 1751 m_cat(result, n); 1752 else 1753 result = n; 1754 } 1755 va_end(ap); 1756 1757 if ((result->m_flags & M_PKTHDR) != 0) { 1758 result->m_pkthdr.len = 0; 1759 for (n = result; n; n = n->m_next) 1760 result->m_pkthdr.len += n->m_len; 1761 } 1762 1763 return result; 1764 1765fail: 1766 m_freem(result); 1767 return NULL; 1768} 1769 1770/* 1771 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1772 * add an entry to SP database, when received 1773 * <base, address(SD), (lifetime(H),) policy> 1774 * from the user(?). 1775 * Adding to SP database, 1776 * and send 1777 * <base, address(SD), (lifetime(H),) policy> 1778 * to the socket which was send. 1779 * 1780 * SPDADD set a unique policy entry. 1781 * SPDSETIDX like SPDADD without a part of policy requests. 1782 * SPDUPDATE replace a unique policy entry. 1783 * 1784 * m will always be freed. 1785 */ 1786static int 1787key_spdadd(so, m, mhp) 1788 struct socket *so; 1789 struct mbuf *m; 1790 const struct sadb_msghdr *mhp; 1791{ 1792 struct sadb_address *src0, *dst0; 1793 struct sadb_x_policy *xpl0, *xpl; 1794 struct sadb_lifetime *lft = NULL; 1795 struct secpolicyindex spidx; 1796 struct secpolicy *newsp; 1797 int error; 1798 1799 IPSEC_ASSERT(so != NULL, ("null socket")); 1800 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1801 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1802 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1803 1804 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1805 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1806 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1807 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1808 return key_senderror(so, m, EINVAL); 1809 } 1810 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1811 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1812 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1813 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1814 __func__)); 1815 return key_senderror(so, m, EINVAL); 1816 } 1817 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1818 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1819 < sizeof(struct sadb_lifetime)) { 1820 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1821 __func__)); 1822 return key_senderror(so, m, EINVAL); 1823 } 1824 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1825 } 1826 1827 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1828 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1829 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1830 1831 /* 1832 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1833 * we are processing traffic endpoints. 1834 */ 1835 1836 /* make secindex */ 1837 /* XXX boundary check against sa_len */ 1838 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1839 src0 + 1, 1840 dst0 + 1, 1841 src0->sadb_address_prefixlen, 1842 dst0->sadb_address_prefixlen, 1843 src0->sadb_address_proto, 1844 &spidx); 1845 1846 /* checking the direciton. */ 1847 switch (xpl0->sadb_x_policy_dir) { 1848 case IPSEC_DIR_INBOUND: 1849 case IPSEC_DIR_OUTBOUND: 1850 break; 1851 default: 1852 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1853 mhp->msg->sadb_msg_errno = EINVAL; 1854 return 0; 1855 } 1856 1857 /* check policy */ 1858 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1859 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1860 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1861 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1862 return key_senderror(so, m, EINVAL); 1863 } 1864 1865 /* policy requests are mandatory when action is ipsec. */ 1866 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1867 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1868 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1869 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1870 __func__)); 1871 return key_senderror(so, m, EINVAL); 1872 } 1873 1874 /* 1875 * checking there is SP already or not. 1876 * SPDUPDATE doesn't depend on whether there is a SP or not. 1877 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1878 * then error. 1879 */ 1880 newsp = key_getsp(&spidx); 1881 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1882 if (newsp) { 1883 newsp->state = IPSEC_SPSTATE_DEAD; 1884 KEY_FREESP(&newsp); 1885 } 1886 } else { 1887 if (newsp != NULL) { 1888 KEY_FREESP(&newsp); 1889 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1890 __func__)); 1891 return key_senderror(so, m, EEXIST); 1892 } 1893 } 1894 1895 /* allocation new SP entry */ 1896 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1897 return key_senderror(so, m, error); 1898 } 1899 1900 if ((newsp->id = key_getnewspid()) == 0) { 1901 _key_delsp(newsp); 1902 return key_senderror(so, m, ENOBUFS); 1903 } 1904 1905 /* XXX boundary check against sa_len */ 1906 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1907 src0 + 1, 1908 dst0 + 1, 1909 src0->sadb_address_prefixlen, 1910 dst0->sadb_address_prefixlen, 1911 src0->sadb_address_proto, 1912 &newsp->spidx); 1913 1914 /* sanity check on addr pair */ 1915 if (((struct sockaddr *)(src0 + 1))->sa_family != 1916 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1917 _key_delsp(newsp); 1918 return key_senderror(so, m, EINVAL); 1919 } 1920 if (((struct sockaddr *)(src0 + 1))->sa_len != 1921 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1922 _key_delsp(newsp); 1923 return key_senderror(so, m, EINVAL); 1924 } 1925#if 1 1926 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1927 struct sockaddr *sa; 1928 sa = (struct sockaddr *)(src0 + 1); 1929 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1930 _key_delsp(newsp); 1931 return key_senderror(so, m, EINVAL); 1932 } 1933 } 1934 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1935 struct sockaddr *sa; 1936 sa = (struct sockaddr *)(dst0 + 1); 1937 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1938 _key_delsp(newsp); 1939 return key_senderror(so, m, EINVAL); 1940 } 1941 } 1942#endif 1943 1944 newsp->created = time_second; 1945 newsp->lastused = newsp->created; 1946 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1947 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1948 1949 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1950 newsp->state = IPSEC_SPSTATE_ALIVE; 1951 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1952 1953 /* delete the entry in spacqtree */ 1954 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1955 struct secspacq *spacq = key_getspacq(&spidx); 1956 if (spacq != NULL) { 1957 /* reset counter in order to deletion by timehandler. */ 1958 spacq->created = time_second; 1959 spacq->count = 0; 1960 SPACQ_UNLOCK(); 1961 } 1962 } 1963 1964 { 1965 struct mbuf *n, *mpolicy; 1966 struct sadb_msg *newmsg; 1967 int off; 1968 1969 /* 1970 * Note: do not send SADB_X_EXT_NAT_T_* here: 1971 * we are sending traffic endpoints. 1972 */ 1973 1974 /* create new sadb_msg to reply. */ 1975 if (lft) { 1976 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1977 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1978 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1979 } else { 1980 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1981 SADB_X_EXT_POLICY, 1982 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1983 } 1984 if (!n) 1985 return key_senderror(so, m, ENOBUFS); 1986 1987 if (n->m_len < sizeof(*newmsg)) { 1988 n = m_pullup(n, sizeof(*newmsg)); 1989 if (!n) 1990 return key_senderror(so, m, ENOBUFS); 1991 } 1992 newmsg = mtod(n, struct sadb_msg *); 1993 newmsg->sadb_msg_errno = 0; 1994 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1995 1996 off = 0; 1997 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1998 sizeof(*xpl), &off); 1999 if (mpolicy == NULL) { 2000 /* n is already freed */ 2001 return key_senderror(so, m, ENOBUFS); 2002 } 2003 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 2004 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 2005 m_freem(n); 2006 return key_senderror(so, m, EINVAL); 2007 } 2008 xpl->sadb_x_policy_id = newsp->id; 2009 2010 m_freem(m); 2011 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2012 } 2013} 2014 2015/* 2016 * get new policy id. 2017 * OUT: 2018 * 0: failure. 2019 * others: success. 2020 */ 2021static u_int32_t 2022key_getnewspid() 2023{ 2024 u_int32_t newid = 0; 2025 int count = V_key_spi_trycnt; /* XXX */ 2026 struct secpolicy *sp; 2027 2028 /* when requesting to allocate spi ranged */ 2029 while (count--) { 2030 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2031 2032 if ((sp = key_getspbyid(newid)) == NULL) 2033 break; 2034 2035 KEY_FREESP(&sp); 2036 } 2037 2038 if (count == 0 || newid == 0) { 2039 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2040 __func__)); 2041 return 0; 2042 } 2043 2044 return newid; 2045} 2046 2047/* 2048 * SADB_SPDDELETE processing 2049 * receive 2050 * <base, address(SD), policy(*)> 2051 * from the user(?), and set SADB_SASTATE_DEAD, 2052 * and send, 2053 * <base, address(SD), policy(*)> 2054 * to the ikmpd. 2055 * policy(*) including direction of policy. 2056 * 2057 * m will always be freed. 2058 */ 2059static int 2060key_spddelete(so, m, mhp) 2061 struct socket *so; 2062 struct mbuf *m; 2063 const struct sadb_msghdr *mhp; 2064{ 2065 struct sadb_address *src0, *dst0; 2066 struct sadb_x_policy *xpl0; 2067 struct secpolicyindex spidx; 2068 struct secpolicy *sp; 2069 2070 IPSEC_ASSERT(so != NULL, ("null so")); 2071 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2072 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2073 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2074 2075 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2076 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2077 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2078 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2079 __func__)); 2080 return key_senderror(so, m, EINVAL); 2081 } 2082 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2083 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2084 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2085 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2086 __func__)); 2087 return key_senderror(so, m, EINVAL); 2088 } 2089 2090 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2091 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2092 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2093 2094 /* 2095 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2096 * we are processing traffic endpoints. 2097 */ 2098 2099 /* make secindex */ 2100 /* XXX boundary check against sa_len */ 2101 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2102 src0 + 1, 2103 dst0 + 1, 2104 src0->sadb_address_prefixlen, 2105 dst0->sadb_address_prefixlen, 2106 src0->sadb_address_proto, 2107 &spidx); 2108 2109 /* checking the direciton. */ 2110 switch (xpl0->sadb_x_policy_dir) { 2111 case IPSEC_DIR_INBOUND: 2112 case IPSEC_DIR_OUTBOUND: 2113 break; 2114 default: 2115 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2116 return key_senderror(so, m, EINVAL); 2117 } 2118 2119 /* Is there SP in SPD ? */ 2120 if ((sp = key_getsp(&spidx)) == NULL) { 2121 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2122 return key_senderror(so, m, EINVAL); 2123 } 2124 2125 /* save policy id to buffer to be returned. */ 2126 xpl0->sadb_x_policy_id = sp->id; 2127 2128 sp->state = IPSEC_SPSTATE_DEAD; 2129 KEY_FREESP(&sp); 2130 2131 { 2132 struct mbuf *n; 2133 struct sadb_msg *newmsg; 2134 2135 /* 2136 * Note: do not send SADB_X_EXT_NAT_T_* here: 2137 * we are sending traffic endpoints. 2138 */ 2139 2140 /* create new sadb_msg to reply. */ 2141 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2142 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2143 if (!n) 2144 return key_senderror(so, m, ENOBUFS); 2145 2146 newmsg = mtod(n, struct sadb_msg *); 2147 newmsg->sadb_msg_errno = 0; 2148 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2149 2150 m_freem(m); 2151 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2152 } 2153} 2154 2155/* 2156 * SADB_SPDDELETE2 processing 2157 * receive 2158 * <base, policy(*)> 2159 * from the user(?), and set SADB_SASTATE_DEAD, 2160 * and send, 2161 * <base, policy(*)> 2162 * to the ikmpd. 2163 * policy(*) including direction of policy. 2164 * 2165 * m will always be freed. 2166 */ 2167static int 2168key_spddelete2(so, m, mhp) 2169 struct socket *so; 2170 struct mbuf *m; 2171 const struct sadb_msghdr *mhp; 2172{ 2173 u_int32_t id; 2174 struct secpolicy *sp; 2175 2176 IPSEC_ASSERT(so != NULL, ("null socket")); 2177 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2178 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2179 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2180 2181 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2182 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2183 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2184 return key_senderror(so, m, EINVAL); 2185 } 2186 2187 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2188 2189 /* Is there SP in SPD ? */ 2190 if ((sp = key_getspbyid(id)) == NULL) { 2191 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2192 return key_senderror(so, m, EINVAL); 2193 } 2194 2195 sp->state = IPSEC_SPSTATE_DEAD; 2196 KEY_FREESP(&sp); 2197 2198 { 2199 struct mbuf *n, *nn; 2200 struct sadb_msg *newmsg; 2201 int off, len; 2202 2203 /* create new sadb_msg to reply. */ 2204 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2205 2206 MGETHDR(n, M_DONTWAIT, MT_DATA); 2207 if (n && len > MHLEN) { 2208 MCLGET(n, M_DONTWAIT); 2209 if ((n->m_flags & M_EXT) == 0) { 2210 m_freem(n); 2211 n = NULL; 2212 } 2213 } 2214 if (!n) 2215 return key_senderror(so, m, ENOBUFS); 2216 2217 n->m_len = len; 2218 n->m_next = NULL; 2219 off = 0; 2220 2221 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2222 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2223 2224 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2225 off, len)); 2226 2227 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2228 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2229 if (!n->m_next) { 2230 m_freem(n); 2231 return key_senderror(so, m, ENOBUFS); 2232 } 2233 2234 n->m_pkthdr.len = 0; 2235 for (nn = n; nn; nn = nn->m_next) 2236 n->m_pkthdr.len += nn->m_len; 2237 2238 newmsg = mtod(n, struct sadb_msg *); 2239 newmsg->sadb_msg_errno = 0; 2240 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2241 2242 m_freem(m); 2243 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2244 } 2245} 2246 2247/* 2248 * SADB_X_GET processing 2249 * receive 2250 * <base, policy(*)> 2251 * from the user(?), 2252 * and send, 2253 * <base, address(SD), policy> 2254 * to the ikmpd. 2255 * policy(*) including direction of policy. 2256 * 2257 * m will always be freed. 2258 */ 2259static int 2260key_spdget(so, m, mhp) 2261 struct socket *so; 2262 struct mbuf *m; 2263 const struct sadb_msghdr *mhp; 2264{ 2265 u_int32_t id; 2266 struct secpolicy *sp; 2267 struct mbuf *n; 2268 2269 IPSEC_ASSERT(so != NULL, ("null socket")); 2270 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2271 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2272 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2273 2274 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2275 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2276 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2277 __func__)); 2278 return key_senderror(so, m, EINVAL); 2279 } 2280 2281 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2282 2283 /* Is there SP in SPD ? */ 2284 if ((sp = key_getspbyid(id)) == NULL) { 2285 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2286 return key_senderror(so, m, ENOENT); 2287 } 2288 2289 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2290 if (n != NULL) { 2291 m_freem(m); 2292 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2293 } else 2294 return key_senderror(so, m, ENOBUFS); 2295} 2296 2297/* 2298 * SADB_X_SPDACQUIRE processing. 2299 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2300 * send 2301 * <base, policy(*)> 2302 * to KMD, and expect to receive 2303 * <base> with SADB_X_SPDACQUIRE if error occured, 2304 * or 2305 * <base, policy> 2306 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2307 * policy(*) is without policy requests. 2308 * 2309 * 0 : succeed 2310 * others: error number 2311 */ 2312int 2313key_spdacquire(sp) 2314 struct secpolicy *sp; 2315{ 2316 struct mbuf *result = NULL, *m; 2317 struct secspacq *newspacq; 2318 2319 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2320 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2321 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2322 ("policy not IPSEC %u", sp->policy)); 2323 2324 /* Get an entry to check whether sent message or not. */ 2325 newspacq = key_getspacq(&sp->spidx); 2326 if (newspacq != NULL) { 2327 if (V_key_blockacq_count < newspacq->count) { 2328 /* reset counter and do send message. */ 2329 newspacq->count = 0; 2330 } else { 2331 /* increment counter and do nothing. */ 2332 newspacq->count++; 2333 return 0; 2334 } 2335 SPACQ_UNLOCK(); 2336 } else { 2337 /* make new entry for blocking to send SADB_ACQUIRE. */ 2338 newspacq = key_newspacq(&sp->spidx); 2339 if (newspacq == NULL) 2340 return ENOBUFS; 2341 } 2342 2343 /* create new sadb_msg to reply. */ 2344 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2345 if (!m) 2346 return ENOBUFS; 2347 2348 result = m; 2349 2350 result->m_pkthdr.len = 0; 2351 for (m = result; m; m = m->m_next) 2352 result->m_pkthdr.len += m->m_len; 2353 2354 mtod(result, struct sadb_msg *)->sadb_msg_len = 2355 PFKEY_UNIT64(result->m_pkthdr.len); 2356 2357 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2358} 2359 2360/* 2361 * SADB_SPDFLUSH processing 2362 * receive 2363 * <base> 2364 * from the user, and free all entries in secpctree. 2365 * and send, 2366 * <base> 2367 * to the user. 2368 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2369 * 2370 * m will always be freed. 2371 */ 2372static int 2373key_spdflush(so, m, mhp) 2374 struct socket *so; 2375 struct mbuf *m; 2376 const struct sadb_msghdr *mhp; 2377{ 2378 struct sadb_msg *newmsg; 2379 struct secpolicy *sp; 2380 u_int dir; 2381 2382 IPSEC_ASSERT(so != NULL, ("null socket")); 2383 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2384 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2385 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2386 2387 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2388 return key_senderror(so, m, EINVAL); 2389 2390 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2391 SPTREE_LOCK(); 2392 LIST_FOREACH(sp, &V_sptree[dir], chain) 2393 sp->state = IPSEC_SPSTATE_DEAD; 2394 SPTREE_UNLOCK(); 2395 } 2396 2397 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2398 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2399 return key_senderror(so, m, ENOBUFS); 2400 } 2401 2402 if (m->m_next) 2403 m_freem(m->m_next); 2404 m->m_next = NULL; 2405 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2406 newmsg = mtod(m, struct sadb_msg *); 2407 newmsg->sadb_msg_errno = 0; 2408 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2409 2410 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2411} 2412 2413/* 2414 * SADB_SPDDUMP processing 2415 * receive 2416 * <base> 2417 * from the user, and dump all SP leaves 2418 * and send, 2419 * <base> ..... 2420 * to the ikmpd. 2421 * 2422 * m will always be freed. 2423 */ 2424static int 2425key_spddump(so, m, mhp) 2426 struct socket *so; 2427 struct mbuf *m; 2428 const struct sadb_msghdr *mhp; 2429{ 2430 struct secpolicy *sp; 2431 int cnt; 2432 u_int dir; 2433 struct mbuf *n; 2434 2435 IPSEC_ASSERT(so != NULL, ("null socket")); 2436 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2437 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2438 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2439 2440 /* search SPD entry and get buffer size. */ 2441 cnt = 0; 2442 SPTREE_LOCK(); 2443 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2444 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2445 cnt++; 2446 } 2447 } 2448 2449 if (cnt == 0) { 2450 SPTREE_UNLOCK(); 2451 return key_senderror(so, m, ENOENT); 2452 } 2453 2454 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2455 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2456 --cnt; 2457 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2458 mhp->msg->sadb_msg_pid); 2459 2460 if (n) 2461 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2462 } 2463 } 2464 2465 SPTREE_UNLOCK(); 2466 m_freem(m); 2467 return 0; 2468} 2469 2470static struct mbuf * 2471key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2472{ 2473 struct mbuf *result = NULL, *m; 2474 struct seclifetime lt; 2475 2476 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2477 if (!m) 2478 goto fail; 2479 result = m; 2480 2481 /* 2482 * Note: do not send SADB_X_EXT_NAT_T_* here: 2483 * we are sending traffic endpoints. 2484 */ 2485 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2486 &sp->spidx.src.sa, sp->spidx.prefs, 2487 sp->spidx.ul_proto); 2488 if (!m) 2489 goto fail; 2490 m_cat(result, m); 2491 2492 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2493 &sp->spidx.dst.sa, sp->spidx.prefd, 2494 sp->spidx.ul_proto); 2495 if (!m) 2496 goto fail; 2497 m_cat(result, m); 2498 2499 m = key_sp2msg(sp); 2500 if (!m) 2501 goto fail; 2502 m_cat(result, m); 2503 2504 if(sp->lifetime){ 2505 lt.addtime=sp->created; 2506 lt.usetime= sp->lastused; 2507 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2508 if (!m) 2509 goto fail; 2510 m_cat(result, m); 2511 2512 lt.addtime=sp->lifetime; 2513 lt.usetime= sp->validtime; 2514 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2515 if (!m) 2516 goto fail; 2517 m_cat(result, m); 2518 } 2519 2520 if ((result->m_flags & M_PKTHDR) == 0) 2521 goto fail; 2522 2523 if (result->m_len < sizeof(struct sadb_msg)) { 2524 result = m_pullup(result, sizeof(struct sadb_msg)); 2525 if (result == NULL) 2526 goto fail; 2527 } 2528 2529 result->m_pkthdr.len = 0; 2530 for (m = result; m; m = m->m_next) 2531 result->m_pkthdr.len += m->m_len; 2532 2533 mtod(result, struct sadb_msg *)->sadb_msg_len = 2534 PFKEY_UNIT64(result->m_pkthdr.len); 2535 2536 return result; 2537 2538fail: 2539 m_freem(result); 2540 return NULL; 2541} 2542 2543/* 2544 * get PFKEY message length for security policy and request. 2545 */ 2546static u_int 2547key_getspreqmsglen(sp) 2548 struct secpolicy *sp; 2549{ 2550 u_int tlen; 2551 2552 tlen = sizeof(struct sadb_x_policy); 2553 2554 /* if is the policy for ipsec ? */ 2555 if (sp->policy != IPSEC_POLICY_IPSEC) 2556 return tlen; 2557 2558 /* get length of ipsec requests */ 2559 { 2560 struct ipsecrequest *isr; 2561 int len; 2562 2563 for (isr = sp->req; isr != NULL; isr = isr->next) { 2564 len = sizeof(struct sadb_x_ipsecrequest) 2565 + isr->saidx.src.sa.sa_len 2566 + isr->saidx.dst.sa.sa_len; 2567 2568 tlen += PFKEY_ALIGN8(len); 2569 } 2570 } 2571 2572 return tlen; 2573} 2574 2575/* 2576 * SADB_SPDEXPIRE processing 2577 * send 2578 * <base, address(SD), lifetime(CH), policy> 2579 * to KMD by PF_KEY. 2580 * 2581 * OUT: 0 : succeed 2582 * others : error number 2583 */ 2584static int 2585key_spdexpire(sp) 2586 struct secpolicy *sp; 2587{ 2588 struct mbuf *result = NULL, *m; 2589 int len; 2590 int error = -1; 2591 struct sadb_lifetime *lt; 2592 2593 /* XXX: Why do we lock ? */ 2594 2595 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2596 2597 /* set msg header */ 2598 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2599 if (!m) { 2600 error = ENOBUFS; 2601 goto fail; 2602 } 2603 result = m; 2604 2605 /* create lifetime extension (current and hard) */ 2606 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2607 m = key_alloc_mbuf(len); 2608 if (!m || m->m_next) { /*XXX*/ 2609 if (m) 2610 m_freem(m); 2611 error = ENOBUFS; 2612 goto fail; 2613 } 2614 bzero(mtod(m, caddr_t), len); 2615 lt = mtod(m, struct sadb_lifetime *); 2616 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2617 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2618 lt->sadb_lifetime_allocations = 0; 2619 lt->sadb_lifetime_bytes = 0; 2620 lt->sadb_lifetime_addtime = sp->created; 2621 lt->sadb_lifetime_usetime = sp->lastused; 2622 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2623 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2624 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2625 lt->sadb_lifetime_allocations = 0; 2626 lt->sadb_lifetime_bytes = 0; 2627 lt->sadb_lifetime_addtime = sp->lifetime; 2628 lt->sadb_lifetime_usetime = sp->validtime; 2629 m_cat(result, m); 2630 2631 /* 2632 * Note: do not send SADB_X_EXT_NAT_T_* here: 2633 * we are sending traffic endpoints. 2634 */ 2635 2636 /* set sadb_address for source */ 2637 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2638 &sp->spidx.src.sa, 2639 sp->spidx.prefs, sp->spidx.ul_proto); 2640 if (!m) { 2641 error = ENOBUFS; 2642 goto fail; 2643 } 2644 m_cat(result, m); 2645 2646 /* set sadb_address for destination */ 2647 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2648 &sp->spidx.dst.sa, 2649 sp->spidx.prefd, sp->spidx.ul_proto); 2650 if (!m) { 2651 error = ENOBUFS; 2652 goto fail; 2653 } 2654 m_cat(result, m); 2655 2656 /* set secpolicy */ 2657 m = key_sp2msg(sp); 2658 if (!m) { 2659 error = ENOBUFS; 2660 goto fail; 2661 } 2662 m_cat(result, m); 2663 2664 if ((result->m_flags & M_PKTHDR) == 0) { 2665 error = EINVAL; 2666 goto fail; 2667 } 2668 2669 if (result->m_len < sizeof(struct sadb_msg)) { 2670 result = m_pullup(result, sizeof(struct sadb_msg)); 2671 if (result == NULL) { 2672 error = ENOBUFS; 2673 goto fail; 2674 } 2675 } 2676 2677 result->m_pkthdr.len = 0; 2678 for (m = result; m; m = m->m_next) 2679 result->m_pkthdr.len += m->m_len; 2680 2681 mtod(result, struct sadb_msg *)->sadb_msg_len = 2682 PFKEY_UNIT64(result->m_pkthdr.len); 2683 2684 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2685 2686 fail: 2687 if (result) 2688 m_freem(result); 2689 return error; 2690} 2691 2692/* %%% SAD management */ 2693/* 2694 * allocating a memory for new SA head, and copy from the values of mhp. 2695 * OUT: NULL : failure due to the lack of memory. 2696 * others : pointer to new SA head. 2697 */ 2698static struct secashead * 2699key_newsah(saidx) 2700 struct secasindex *saidx; 2701{ 2702 struct secashead *newsah; 2703 2704 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2705 2706 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2707 if (newsah != NULL) { 2708 int i; 2709 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2710 LIST_INIT(&newsah->savtree[i]); 2711 newsah->saidx = *saidx; 2712 2713 /* add to saidxtree */ 2714 newsah->state = SADB_SASTATE_MATURE; 2715 2716 SAHTREE_LOCK(); 2717 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2718 SAHTREE_UNLOCK(); 2719 } 2720 return(newsah); 2721} 2722 2723/* 2724 * delete SA index and all SA registerd. 2725 */ 2726static void 2727key_delsah(sah) 2728 struct secashead *sah; 2729{ 2730 struct secasvar *sav, *nextsav; 2731 u_int stateidx; 2732 int zombie = 0; 2733 2734 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2735 SAHTREE_LOCK_ASSERT(); 2736 2737 /* searching all SA registerd in the secindex. */ 2738 for (stateidx = 0; 2739 stateidx < _ARRAYLEN(saorder_state_any); 2740 stateidx++) { 2741 u_int state = saorder_state_any[stateidx]; 2742 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2743 if (sav->refcnt == 0) { 2744 /* sanity check */ 2745 KEY_CHKSASTATE(state, sav->state, __func__); 2746 /* 2747 * do NOT call KEY_FREESAV here: 2748 * it will only delete the sav if refcnt == 1, 2749 * where we already know that refcnt == 0 2750 */ 2751 key_delsav(sav); 2752 } else { 2753 /* give up to delete this sa */ 2754 zombie++; 2755 } 2756 } 2757 } 2758 if (!zombie) { /* delete only if there are savs */ 2759 /* remove from tree of SA index */ 2760 if (__LIST_CHAINED(sah)) 2761 LIST_REMOVE(sah, chain); 2762 if (sah->sa_route.ro_rt) { 2763 RTFREE(sah->sa_route.ro_rt); 2764 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2765 } 2766 free(sah, M_IPSEC_SAH); 2767 } 2768} 2769 2770/* 2771 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2772 * and copy the values of mhp into new buffer. 2773 * When SAD message type is GETSPI: 2774 * to set sequence number from acq_seq++, 2775 * to set zero to SPI. 2776 * not to call key_setsava(). 2777 * OUT: NULL : fail 2778 * others : pointer to new secasvar. 2779 * 2780 * does not modify mbuf. does not free mbuf on error. 2781 */ 2782static struct secasvar * 2783key_newsav(m, mhp, sah, errp, where, tag) 2784 struct mbuf *m; 2785 const struct sadb_msghdr *mhp; 2786 struct secashead *sah; 2787 int *errp; 2788 const char* where; 2789 int tag; 2790{ 2791 struct secasvar *newsav; 2792 const struct sadb_sa *xsa; 2793 2794 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2795 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2796 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2797 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2798 2799 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2800 if (newsav == NULL) { 2801 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2802 *errp = ENOBUFS; 2803 goto done; 2804 } 2805 2806 switch (mhp->msg->sadb_msg_type) { 2807 case SADB_GETSPI: 2808 newsav->spi = 0; 2809 2810#ifdef IPSEC_DOSEQCHECK 2811 /* sync sequence number */ 2812 if (mhp->msg->sadb_msg_seq == 0) 2813 newsav->seq = 2814 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2815 else 2816#endif 2817 newsav->seq = mhp->msg->sadb_msg_seq; 2818 break; 2819 2820 case SADB_ADD: 2821 /* sanity check */ 2822 if (mhp->ext[SADB_EXT_SA] == NULL) { 2823 free(newsav, M_IPSEC_SA); 2824 newsav = NULL; 2825 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2826 __func__)); 2827 *errp = EINVAL; 2828 goto done; 2829 } 2830 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2831 newsav->spi = xsa->sadb_sa_spi; 2832 newsav->seq = mhp->msg->sadb_msg_seq; 2833 break; 2834 default: 2835 free(newsav, M_IPSEC_SA); 2836 newsav = NULL; 2837 *errp = EINVAL; 2838 goto done; 2839 } 2840 2841 2842 /* copy sav values */ 2843 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2844 *errp = key_setsaval(newsav, m, mhp); 2845 if (*errp) { 2846 free(newsav, M_IPSEC_SA); 2847 newsav = NULL; 2848 goto done; 2849 } 2850 } 2851 2852 SECASVAR_LOCK_INIT(newsav); 2853 2854 /* reset created */ 2855 newsav->created = time_second; 2856 newsav->pid = mhp->msg->sadb_msg_pid; 2857 2858 /* add to satree */ 2859 newsav->sah = sah; 2860 sa_initref(newsav); 2861 newsav->state = SADB_SASTATE_LARVAL; 2862 2863 /* XXX locking??? */ 2864 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2865 secasvar, chain); 2866done: 2867 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2868 printf("DP %s from %s:%u return SP:%p\n", __func__, 2869 where, tag, newsav)); 2870 2871 return newsav; 2872} 2873 2874/* 2875 * free() SA variable entry. 2876 */ 2877static void 2878key_cleansav(struct secasvar *sav) 2879{ 2880 /* 2881 * Cleanup xform state. Note that zeroize'ing causes the 2882 * keys to be cleared; otherwise we must do it ourself. 2883 */ 2884 if (sav->tdb_xform != NULL) { 2885 sav->tdb_xform->xf_zeroize(sav); 2886 sav->tdb_xform = NULL; 2887 } else { 2888 KASSERT(sav->iv == NULL, ("iv but no xform")); 2889 if (sav->key_auth != NULL) 2890 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2891 if (sav->key_enc != NULL) 2892 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2893 } 2894 if (sav->key_auth != NULL) { 2895 if (sav->key_auth->key_data != NULL) 2896 free(sav->key_auth->key_data, M_IPSEC_MISC); 2897 free(sav->key_auth, M_IPSEC_MISC); 2898 sav->key_auth = NULL; 2899 } 2900 if (sav->key_enc != NULL) { 2901 if (sav->key_enc->key_data != NULL) 2902 free(sav->key_enc->key_data, M_IPSEC_MISC); 2903 free(sav->key_enc, M_IPSEC_MISC); 2904 sav->key_enc = NULL; 2905 } 2906 if (sav->sched) { 2907 bzero(sav->sched, sav->schedlen); 2908 free(sav->sched, M_IPSEC_MISC); 2909 sav->sched = NULL; 2910 } 2911 if (sav->replay != NULL) { 2912 free(sav->replay, M_IPSEC_MISC); 2913 sav->replay = NULL; 2914 } 2915 if (sav->lft_c != NULL) { 2916 free(sav->lft_c, M_IPSEC_MISC); 2917 sav->lft_c = NULL; 2918 } 2919 if (sav->lft_h != NULL) { 2920 free(sav->lft_h, M_IPSEC_MISC); 2921 sav->lft_h = NULL; 2922 } 2923 if (sav->lft_s != NULL) { 2924 free(sav->lft_s, M_IPSEC_MISC); 2925 sav->lft_s = NULL; 2926 } 2927} 2928 2929/* 2930 * free() SA variable entry. 2931 */ 2932static void 2933key_delsav(sav) 2934 struct secasvar *sav; 2935{ 2936 IPSEC_ASSERT(sav != NULL, ("null sav")); 2937 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2938 2939 /* remove from SA header */ 2940 if (__LIST_CHAINED(sav)) 2941 LIST_REMOVE(sav, chain); 2942 key_cleansav(sav); 2943 SECASVAR_LOCK_DESTROY(sav); 2944 free(sav, M_IPSEC_SA); 2945} 2946 2947/* 2948 * search SAD. 2949 * OUT: 2950 * NULL : not found 2951 * others : found, pointer to a SA. 2952 */ 2953static struct secashead * 2954key_getsah(saidx) 2955 struct secasindex *saidx; 2956{ 2957 struct secashead *sah; 2958 2959 SAHTREE_LOCK(); 2960 LIST_FOREACH(sah, &V_sahtree, chain) { 2961 if (sah->state == SADB_SASTATE_DEAD) 2962 continue; 2963 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2964 break; 2965 } 2966 SAHTREE_UNLOCK(); 2967 2968 return sah; 2969} 2970 2971/* 2972 * check not to be duplicated SPI. 2973 * NOTE: this function is too slow due to searching all SAD. 2974 * OUT: 2975 * NULL : not found 2976 * others : found, pointer to a SA. 2977 */ 2978static struct secasvar * 2979key_checkspidup(saidx, spi) 2980 struct secasindex *saidx; 2981 u_int32_t spi; 2982{ 2983 struct secashead *sah; 2984 struct secasvar *sav; 2985 2986 /* check address family */ 2987 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2988 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2989 __func__)); 2990 return NULL; 2991 } 2992 2993 sav = NULL; 2994 /* check all SAD */ 2995 SAHTREE_LOCK(); 2996 LIST_FOREACH(sah, &V_sahtree, chain) { 2997 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2998 continue; 2999 sav = key_getsavbyspi(sah, spi); 3000 if (sav != NULL) 3001 break; 3002 } 3003 SAHTREE_UNLOCK(); 3004 3005 return sav; 3006} 3007 3008/* 3009 * search SAD litmited alive SA, protocol, SPI. 3010 * OUT: 3011 * NULL : not found 3012 * others : found, pointer to a SA. 3013 */ 3014static struct secasvar * 3015key_getsavbyspi(sah, spi) 3016 struct secashead *sah; 3017 u_int32_t spi; 3018{ 3019 struct secasvar *sav; 3020 u_int stateidx, state; 3021 3022 sav = NULL; 3023 SAHTREE_LOCK_ASSERT(); 3024 /* search all status */ 3025 for (stateidx = 0; 3026 stateidx < _ARRAYLEN(saorder_state_alive); 3027 stateidx++) { 3028 3029 state = saorder_state_alive[stateidx]; 3030 LIST_FOREACH(sav, &sah->savtree[state], chain) { 3031 3032 /* sanity check */ 3033 if (sav->state != state) { 3034 ipseclog((LOG_DEBUG, "%s: " 3035 "invalid sav->state (queue: %d SA: %d)\n", 3036 __func__, state, sav->state)); 3037 continue; 3038 } 3039 3040 if (sav->spi == spi) 3041 return sav; 3042 } 3043 } 3044 3045 return NULL; 3046} 3047 3048/* 3049 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3050 * You must update these if need. 3051 * OUT: 0: success. 3052 * !0: failure. 3053 * 3054 * does not modify mbuf. does not free mbuf on error. 3055 */ 3056static int 3057key_setsaval(sav, m, mhp) 3058 struct secasvar *sav; 3059 struct mbuf *m; 3060 const struct sadb_msghdr *mhp; 3061{ 3062 int error = 0; 3063 3064 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3065 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3066 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3067 3068 /* initialization */ 3069 sav->replay = NULL; 3070 sav->key_auth = NULL; 3071 sav->key_enc = NULL; 3072 sav->sched = NULL; 3073 sav->schedlen = 0; 3074 sav->iv = NULL; 3075 sav->lft_c = NULL; 3076 sav->lft_h = NULL; 3077 sav->lft_s = NULL; 3078 sav->tdb_xform = NULL; /* transform */ 3079 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3080 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3081 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3082 /* Initialize even if NAT-T not compiled in: */ 3083 sav->natt_type = 0; 3084 sav->natt_esp_frag_len = 0; 3085 3086 /* SA */ 3087 if (mhp->ext[SADB_EXT_SA] != NULL) { 3088 const struct sadb_sa *sa0; 3089 3090 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3091 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3092 error = EINVAL; 3093 goto fail; 3094 } 3095 3096 sav->alg_auth = sa0->sadb_sa_auth; 3097 sav->alg_enc = sa0->sadb_sa_encrypt; 3098 sav->flags = sa0->sadb_sa_flags; 3099 3100 /* replay window */ 3101 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3102 sav->replay = (struct secreplay *) 3103 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3104 if (sav->replay == NULL) { 3105 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3106 __func__)); 3107 error = ENOBUFS; 3108 goto fail; 3109 } 3110 if (sa0->sadb_sa_replay != 0) 3111 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3112 sav->replay->wsize = sa0->sadb_sa_replay; 3113 } 3114 } 3115 3116 /* Authentication keys */ 3117 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3118 const struct sadb_key *key0; 3119 int len; 3120 3121 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3122 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3123 3124 error = 0; 3125 if (len < sizeof(*key0)) { 3126 error = EINVAL; 3127 goto fail; 3128 } 3129 switch (mhp->msg->sadb_msg_satype) { 3130 case SADB_SATYPE_AH: 3131 case SADB_SATYPE_ESP: 3132 case SADB_X_SATYPE_TCPSIGNATURE: 3133 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3134 sav->alg_auth != SADB_X_AALG_NULL) 3135 error = EINVAL; 3136 break; 3137 case SADB_X_SATYPE_IPCOMP: 3138 default: 3139 error = EINVAL; 3140 break; 3141 } 3142 if (error) { 3143 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3144 __func__)); 3145 goto fail; 3146 } 3147 3148 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3149 M_IPSEC_MISC); 3150 if (sav->key_auth == NULL ) { 3151 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3152 __func__)); 3153 error = ENOBUFS; 3154 goto fail; 3155 } 3156 } 3157 3158 /* Encryption key */ 3159 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3160 const struct sadb_key *key0; 3161 int len; 3162 3163 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3164 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3165 3166 error = 0; 3167 if (len < sizeof(*key0)) { 3168 error = EINVAL; 3169 goto fail; 3170 } 3171 switch (mhp->msg->sadb_msg_satype) { 3172 case SADB_SATYPE_ESP: 3173 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3174 sav->alg_enc != SADB_EALG_NULL) { 3175 error = EINVAL; 3176 break; 3177 } 3178 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3179 len, 3180 M_IPSEC_MISC); 3181 if (sav->key_enc == NULL) { 3182 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3183 __func__)); 3184 error = ENOBUFS; 3185 goto fail; 3186 } 3187 break; 3188 case SADB_X_SATYPE_IPCOMP: 3189 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3190 error = EINVAL; 3191 sav->key_enc = NULL; /*just in case*/ 3192 break; 3193 case SADB_SATYPE_AH: 3194 case SADB_X_SATYPE_TCPSIGNATURE: 3195 default: 3196 error = EINVAL; 3197 break; 3198 } 3199 if (error) { 3200 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3201 __func__)); 3202 goto fail; 3203 } 3204 } 3205 3206 /* set iv */ 3207 sav->ivlen = 0; 3208 3209 switch (mhp->msg->sadb_msg_satype) { 3210 case SADB_SATYPE_AH: 3211 error = xform_init(sav, XF_AH); 3212 break; 3213 case SADB_SATYPE_ESP: 3214 error = xform_init(sav, XF_ESP); 3215 break; 3216 case SADB_X_SATYPE_IPCOMP: 3217 error = xform_init(sav, XF_IPCOMP); 3218 break; 3219 case SADB_X_SATYPE_TCPSIGNATURE: 3220 error = xform_init(sav, XF_TCPSIGNATURE); 3221 break; 3222 } 3223 if (error) { 3224 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3225 __func__, mhp->msg->sadb_msg_satype)); 3226 goto fail; 3227 } 3228 3229 /* reset created */ 3230 sav->created = time_second; 3231 3232 /* make lifetime for CURRENT */ 3233 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3234 if (sav->lft_c == NULL) { 3235 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3236 error = ENOBUFS; 3237 goto fail; 3238 } 3239 3240 sav->lft_c->allocations = 0; 3241 sav->lft_c->bytes = 0; 3242 sav->lft_c->addtime = time_second; 3243 sav->lft_c->usetime = 0; 3244 3245 /* lifetimes for HARD and SOFT */ 3246 { 3247 const struct sadb_lifetime *lft0; 3248 3249 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3250 if (lft0 != NULL) { 3251 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3252 error = EINVAL; 3253 goto fail; 3254 } 3255 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3256 if (sav->lft_h == NULL) { 3257 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3258 error = ENOBUFS; 3259 goto fail; 3260 } 3261 /* to be initialize ? */ 3262 } 3263 3264 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3265 if (lft0 != NULL) { 3266 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3267 error = EINVAL; 3268 goto fail; 3269 } 3270 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3271 if (sav->lft_s == NULL) { 3272 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3273 error = ENOBUFS; 3274 goto fail; 3275 } 3276 /* to be initialize ? */ 3277 } 3278 } 3279 3280 return 0; 3281 3282 fail: 3283 /* initialization */ 3284 key_cleansav(sav); 3285 3286 return error; 3287} 3288 3289/* 3290 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3291 * OUT: 0: valid 3292 * other: errno 3293 */ 3294static int 3295key_mature(struct secasvar *sav) 3296{ 3297 int error; 3298 3299 /* check SPI value */ 3300 switch (sav->sah->saidx.proto) { 3301 case IPPROTO_ESP: 3302 case IPPROTO_AH: 3303 /* 3304 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3305 * 1-255 reserved by IANA for future use, 3306 * 0 for implementation specific, local use. 3307 */ 3308 if (ntohl(sav->spi) <= 255) { 3309 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3310 __func__, (u_int32_t)ntohl(sav->spi))); 3311 return EINVAL; 3312 } 3313 break; 3314 } 3315 3316 /* check satype */ 3317 switch (sav->sah->saidx.proto) { 3318 case IPPROTO_ESP: 3319 /* check flags */ 3320 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3321 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3322 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3323 "given to old-esp.\n", __func__)); 3324 return EINVAL; 3325 } 3326 error = xform_init(sav, XF_ESP); 3327 break; 3328 case IPPROTO_AH: 3329 /* check flags */ 3330 if (sav->flags & SADB_X_EXT_DERIV) { 3331 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3332 "given to AH SA.\n", __func__)); 3333 return EINVAL; 3334 } 3335 if (sav->alg_enc != SADB_EALG_NONE) { 3336 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3337 "mismated.\n", __func__)); 3338 return(EINVAL); 3339 } 3340 error = xform_init(sav, XF_AH); 3341 break; 3342 case IPPROTO_IPCOMP: 3343 if (sav->alg_auth != SADB_AALG_NONE) { 3344 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3345 "mismated.\n", __func__)); 3346 return(EINVAL); 3347 } 3348 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3349 && ntohl(sav->spi) >= 0x10000) { 3350 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3351 __func__)); 3352 return(EINVAL); 3353 } 3354 error = xform_init(sav, XF_IPCOMP); 3355 break; 3356 case IPPROTO_TCP: 3357 if (sav->alg_enc != SADB_EALG_NONE) { 3358 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3359 "mismated.\n", __func__)); 3360 return(EINVAL); 3361 } 3362 error = xform_init(sav, XF_TCPSIGNATURE); 3363 break; 3364 default: 3365 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3366 error = EPROTONOSUPPORT; 3367 break; 3368 } 3369 if (error == 0) { 3370 SAHTREE_LOCK(); 3371 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3372 SAHTREE_UNLOCK(); 3373 } 3374 return (error); 3375} 3376 3377/* 3378 * subroutine for SADB_GET and SADB_DUMP. 3379 */ 3380static struct mbuf * 3381key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3382 u_int32_t seq, u_int32_t pid) 3383{ 3384 struct mbuf *result = NULL, *tres = NULL, *m; 3385 int i; 3386 int dumporder[] = { 3387 SADB_EXT_SA, SADB_X_EXT_SA2, 3388 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3389 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3390 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3391 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3392 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3393#ifdef IPSEC_NAT_T 3394 SADB_X_EXT_NAT_T_TYPE, 3395 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3396 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3397 SADB_X_EXT_NAT_T_FRAG, 3398#endif 3399 }; 3400 3401 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3402 if (m == NULL) 3403 goto fail; 3404 result = m; 3405 3406 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3407 m = NULL; 3408 switch (dumporder[i]) { 3409 case SADB_EXT_SA: 3410 m = key_setsadbsa(sav); 3411 if (!m) 3412 goto fail; 3413 break; 3414 3415 case SADB_X_EXT_SA2: 3416 m = key_setsadbxsa2(sav->sah->saidx.mode, 3417 sav->replay ? sav->replay->count : 0, 3418 sav->sah->saidx.reqid); 3419 if (!m) 3420 goto fail; 3421 break; 3422 3423 case SADB_EXT_ADDRESS_SRC: 3424 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3425 &sav->sah->saidx.src.sa, 3426 FULLMASK, IPSEC_ULPROTO_ANY); 3427 if (!m) 3428 goto fail; 3429 break; 3430 3431 case SADB_EXT_ADDRESS_DST: 3432 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3433 &sav->sah->saidx.dst.sa, 3434 FULLMASK, IPSEC_ULPROTO_ANY); 3435 if (!m) 3436 goto fail; 3437 break; 3438 3439 case SADB_EXT_KEY_AUTH: 3440 if (!sav->key_auth) 3441 continue; 3442 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3443 if (!m) 3444 goto fail; 3445 break; 3446 3447 case SADB_EXT_KEY_ENCRYPT: 3448 if (!sav->key_enc) 3449 continue; 3450 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3451 if (!m) 3452 goto fail; 3453 break; 3454 3455 case SADB_EXT_LIFETIME_CURRENT: 3456 if (!sav->lft_c) 3457 continue; 3458 m = key_setlifetime(sav->lft_c, 3459 SADB_EXT_LIFETIME_CURRENT); 3460 if (!m) 3461 goto fail; 3462 break; 3463 3464 case SADB_EXT_LIFETIME_HARD: 3465 if (!sav->lft_h) 3466 continue; 3467 m = key_setlifetime(sav->lft_h, 3468 SADB_EXT_LIFETIME_HARD); 3469 if (!m) 3470 goto fail; 3471 break; 3472 3473 case SADB_EXT_LIFETIME_SOFT: 3474 if (!sav->lft_s) 3475 continue; 3476 m = key_setlifetime(sav->lft_s, 3477 SADB_EXT_LIFETIME_SOFT); 3478 3479 if (!m) 3480 goto fail; 3481 break; 3482 3483#ifdef IPSEC_NAT_T 3484 case SADB_X_EXT_NAT_T_TYPE: 3485 m = key_setsadbxtype(sav->natt_type); 3486 if (!m) 3487 goto fail; 3488 break; 3489 3490 case SADB_X_EXT_NAT_T_DPORT: 3491 m = key_setsadbxport( 3492 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3493 SADB_X_EXT_NAT_T_DPORT); 3494 if (!m) 3495 goto fail; 3496 break; 3497 3498 case SADB_X_EXT_NAT_T_SPORT: 3499 m = key_setsadbxport( 3500 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3501 SADB_X_EXT_NAT_T_SPORT); 3502 if (!m) 3503 goto fail; 3504 break; 3505 3506 case SADB_X_EXT_NAT_T_OAI: 3507 case SADB_X_EXT_NAT_T_OAR: 3508 case SADB_X_EXT_NAT_T_FRAG: 3509 /* We do not (yet) support those. */ 3510 continue; 3511#endif 3512 3513 case SADB_EXT_ADDRESS_PROXY: 3514 case SADB_EXT_IDENTITY_SRC: 3515 case SADB_EXT_IDENTITY_DST: 3516 /* XXX: should we brought from SPD ? */ 3517 case SADB_EXT_SENSITIVITY: 3518 default: 3519 continue; 3520 } 3521 3522 if (!m) 3523 goto fail; 3524 if (tres) 3525 m_cat(m, tres); 3526 tres = m; 3527 3528 } 3529 3530 m_cat(result, tres); 3531 if (result->m_len < sizeof(struct sadb_msg)) { 3532 result = m_pullup(result, sizeof(struct sadb_msg)); 3533 if (result == NULL) 3534 goto fail; 3535 } 3536 3537 result->m_pkthdr.len = 0; 3538 for (m = result; m; m = m->m_next) 3539 result->m_pkthdr.len += m->m_len; 3540 3541 mtod(result, struct sadb_msg *)->sadb_msg_len = 3542 PFKEY_UNIT64(result->m_pkthdr.len); 3543 3544 return result; 3545 3546fail: 3547 m_freem(result); 3548 m_freem(tres); 3549 return NULL; 3550} 3551 3552/* 3553 * set data into sadb_msg. 3554 */ 3555static struct mbuf * 3556key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3557 pid_t pid, u_int16_t reserved) 3558{ 3559 struct mbuf *m; 3560 struct sadb_msg *p; 3561 int len; 3562 3563 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3564 if (len > MCLBYTES) 3565 return NULL; 3566 MGETHDR(m, M_DONTWAIT, MT_DATA); 3567 if (m && len > MHLEN) { 3568 MCLGET(m, M_DONTWAIT); 3569 if ((m->m_flags & M_EXT) == 0) { 3570 m_freem(m); 3571 m = NULL; 3572 } 3573 } 3574 if (!m) 3575 return NULL; 3576 m->m_pkthdr.len = m->m_len = len; 3577 m->m_next = NULL; 3578 3579 p = mtod(m, struct sadb_msg *); 3580 3581 bzero(p, len); 3582 p->sadb_msg_version = PF_KEY_V2; 3583 p->sadb_msg_type = type; 3584 p->sadb_msg_errno = 0; 3585 p->sadb_msg_satype = satype; 3586 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3587 p->sadb_msg_reserved = reserved; 3588 p->sadb_msg_seq = seq; 3589 p->sadb_msg_pid = (u_int32_t)pid; 3590 3591 return m; 3592} 3593 3594/* 3595 * copy secasvar data into sadb_address. 3596 */ 3597static struct mbuf * 3598key_setsadbsa(sav) 3599 struct secasvar *sav; 3600{ 3601 struct mbuf *m; 3602 struct sadb_sa *p; 3603 int len; 3604 3605 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3606 m = key_alloc_mbuf(len); 3607 if (!m || m->m_next) { /*XXX*/ 3608 if (m) 3609 m_freem(m); 3610 return NULL; 3611 } 3612 3613 p = mtod(m, struct sadb_sa *); 3614 3615 bzero(p, len); 3616 p->sadb_sa_len = PFKEY_UNIT64(len); 3617 p->sadb_sa_exttype = SADB_EXT_SA; 3618 p->sadb_sa_spi = sav->spi; 3619 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3620 p->sadb_sa_state = sav->state; 3621 p->sadb_sa_auth = sav->alg_auth; 3622 p->sadb_sa_encrypt = sav->alg_enc; 3623 p->sadb_sa_flags = sav->flags; 3624 3625 return m; 3626} 3627 3628/* 3629 * set data into sadb_address. 3630 */ 3631static struct mbuf * 3632key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3633{ 3634 struct mbuf *m; 3635 struct sadb_address *p; 3636 size_t len; 3637 3638 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3639 PFKEY_ALIGN8(saddr->sa_len); 3640 m = key_alloc_mbuf(len); 3641 if (!m || m->m_next) { /*XXX*/ 3642 if (m) 3643 m_freem(m); 3644 return NULL; 3645 } 3646 3647 p = mtod(m, struct sadb_address *); 3648 3649 bzero(p, len); 3650 p->sadb_address_len = PFKEY_UNIT64(len); 3651 p->sadb_address_exttype = exttype; 3652 p->sadb_address_proto = ul_proto; 3653 if (prefixlen == FULLMASK) { 3654 switch (saddr->sa_family) { 3655 case AF_INET: 3656 prefixlen = sizeof(struct in_addr) << 3; 3657 break; 3658 case AF_INET6: 3659 prefixlen = sizeof(struct in6_addr) << 3; 3660 break; 3661 default: 3662 ; /*XXX*/ 3663 } 3664 } 3665 p->sadb_address_prefixlen = prefixlen; 3666 p->sadb_address_reserved = 0; 3667 3668 bcopy(saddr, 3669 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3670 saddr->sa_len); 3671 3672 return m; 3673} 3674 3675/* 3676 * set data into sadb_x_sa2. 3677 */ 3678static struct mbuf * 3679key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3680{ 3681 struct mbuf *m; 3682 struct sadb_x_sa2 *p; 3683 size_t len; 3684 3685 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3686 m = key_alloc_mbuf(len); 3687 if (!m || m->m_next) { /*XXX*/ 3688 if (m) 3689 m_freem(m); 3690 return NULL; 3691 } 3692 3693 p = mtod(m, struct sadb_x_sa2 *); 3694 3695 bzero(p, len); 3696 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3697 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3698 p->sadb_x_sa2_mode = mode; 3699 p->sadb_x_sa2_reserved1 = 0; 3700 p->sadb_x_sa2_reserved2 = 0; 3701 p->sadb_x_sa2_sequence = seq; 3702 p->sadb_x_sa2_reqid = reqid; 3703 3704 return m; 3705} 3706 3707#ifdef IPSEC_NAT_T 3708/* 3709 * Set a type in sadb_x_nat_t_type. 3710 */ 3711static struct mbuf * 3712key_setsadbxtype(u_int16_t type) 3713{ 3714 struct mbuf *m; 3715 size_t len; 3716 struct sadb_x_nat_t_type *p; 3717 3718 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3719 3720 m = key_alloc_mbuf(len); 3721 if (!m || m->m_next) { /*XXX*/ 3722 if (m) 3723 m_freem(m); 3724 return (NULL); 3725 } 3726 3727 p = mtod(m, struct sadb_x_nat_t_type *); 3728 3729 bzero(p, len); 3730 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3731 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3732 p->sadb_x_nat_t_type_type = type; 3733 3734 return (m); 3735} 3736/* 3737 * Set a port in sadb_x_nat_t_port. 3738 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3739 */ 3740static struct mbuf * 3741key_setsadbxport(u_int16_t port, u_int16_t type) 3742{ 3743 struct mbuf *m; 3744 size_t len; 3745 struct sadb_x_nat_t_port *p; 3746 3747 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3748 3749 m = key_alloc_mbuf(len); 3750 if (!m || m->m_next) { /*XXX*/ 3751 if (m) 3752 m_freem(m); 3753 return (NULL); 3754 } 3755 3756 p = mtod(m, struct sadb_x_nat_t_port *); 3757 3758 bzero(p, len); 3759 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3760 p->sadb_x_nat_t_port_exttype = type; 3761 p->sadb_x_nat_t_port_port = port; 3762 3763 return (m); 3764} 3765 3766/* 3767 * Get port from sockaddr. Port is in network byte order. 3768 */ 3769u_int16_t 3770key_portfromsaddr(struct sockaddr *sa) 3771{ 3772 3773 switch (sa->sa_family) { 3774#ifdef INET 3775 case AF_INET: 3776 return ((struct sockaddr_in *)sa)->sin_port; 3777#endif 3778#ifdef INET6 3779 case AF_INET6: 3780 return ((struct sockaddr_in6 *)sa)->sin6_port; 3781#endif 3782 } 3783 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3784 printf("DP %s unexpected address family %d\n", 3785 __func__, sa->sa_family)); 3786 return (0); 3787} 3788#endif /* IPSEC_NAT_T */ 3789 3790/* 3791 * Set port in struct sockaddr. Port is in network byte order. 3792 */ 3793static void 3794key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3795{ 3796 3797 switch (sa->sa_family) { 3798#ifdef INET 3799 case AF_INET: 3800 ((struct sockaddr_in *)sa)->sin_port = port; 3801 break; 3802#endif 3803#ifdef INET6 3804 case AF_INET6: 3805 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3806 break; 3807#endif 3808 default: 3809 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3810 __func__, sa->sa_family)); 3811 break; 3812 } 3813} 3814 3815/* 3816 * set data into sadb_x_policy 3817 */ 3818static struct mbuf * 3819key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3820{ 3821 struct mbuf *m; 3822 struct sadb_x_policy *p; 3823 size_t len; 3824 3825 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3826 m = key_alloc_mbuf(len); 3827 if (!m || m->m_next) { /*XXX*/ 3828 if (m) 3829 m_freem(m); 3830 return NULL; 3831 } 3832 3833 p = mtod(m, struct sadb_x_policy *); 3834 3835 bzero(p, len); 3836 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3837 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3838 p->sadb_x_policy_type = type; 3839 p->sadb_x_policy_dir = dir; 3840 p->sadb_x_policy_id = id; 3841 3842 return m; 3843} 3844 3845/* %%% utilities */ 3846/* Take a key message (sadb_key) from the socket and turn it into one 3847 * of the kernel's key structures (seckey). 3848 * 3849 * IN: pointer to the src 3850 * OUT: NULL no more memory 3851 */ 3852struct seckey * 3853key_dup_keymsg(const struct sadb_key *src, u_int len, 3854 struct malloc_type *type) 3855{ 3856 struct seckey *dst; 3857 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3858 if (dst != NULL) { 3859 dst->bits = src->sadb_key_bits; 3860 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3861 if (dst->key_data != NULL) { 3862 bcopy((const char *)src + sizeof(struct sadb_key), 3863 dst->key_data, len); 3864 } else { 3865 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3866 __func__)); 3867 free(dst, type); 3868 dst = NULL; 3869 } 3870 } else { 3871 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3872 __func__)); 3873 3874 } 3875 return dst; 3876} 3877 3878/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3879 * turn it into one of the kernel's lifetime structures (seclifetime). 3880 * 3881 * IN: pointer to the destination, source and malloc type 3882 * OUT: NULL, no more memory 3883 */ 3884 3885static struct seclifetime * 3886key_dup_lifemsg(const struct sadb_lifetime *src, 3887 struct malloc_type *type) 3888{ 3889 struct seclifetime *dst = NULL; 3890 3891 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3892 type, M_NOWAIT); 3893 if (dst == NULL) { 3894 /* XXX counter */ 3895 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3896 } else { 3897 dst->allocations = src->sadb_lifetime_allocations; 3898 dst->bytes = src->sadb_lifetime_bytes; 3899 dst->addtime = src->sadb_lifetime_addtime; 3900 dst->usetime = src->sadb_lifetime_usetime; 3901 } 3902 return dst; 3903} 3904 3905/* compare my own address 3906 * OUT: 1: true, i.e. my address. 3907 * 0: false 3908 */ 3909int 3910key_ismyaddr(sa) 3911 struct sockaddr *sa; 3912{ 3913#ifdef INET 3914 struct sockaddr_in *sin; 3915 struct in_ifaddr *ia; 3916#endif 3917 3918 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3919 3920 switch (sa->sa_family) { 3921#ifdef INET 3922 case AF_INET: 3923 sin = (struct sockaddr_in *)sa; 3924 IN_IFADDR_RLOCK(); 3925 for (ia = V_in_ifaddrhead.tqh_first; ia; 3926 ia = ia->ia_link.tqe_next) 3927 { 3928 if (sin->sin_family == ia->ia_addr.sin_family && 3929 sin->sin_len == ia->ia_addr.sin_len && 3930 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3931 { 3932 IN_IFADDR_RUNLOCK(); 3933 return 1; 3934 } 3935 } 3936 IN_IFADDR_RUNLOCK(); 3937 break; 3938#endif 3939#ifdef INET6 3940 case AF_INET6: 3941 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3942#endif 3943 } 3944 3945 return 0; 3946} 3947 3948#ifdef INET6 3949/* 3950 * compare my own address for IPv6. 3951 * 1: ours 3952 * 0: other 3953 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3954 */ 3955#include <netinet6/in6_var.h> 3956 3957static int 3958key_ismyaddr6(sin6) 3959 struct sockaddr_in6 *sin6; 3960{ 3961 struct in6_ifaddr *ia; 3962#if 0 3963 struct in6_multi *in6m; 3964#endif 3965 3966 IN6_IFADDR_RLOCK(); 3967 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3968 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3969 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3970 IN6_IFADDR_RUNLOCK(); 3971 return 1; 3972 } 3973 3974#if 0 3975 /* 3976 * XXX Multicast 3977 * XXX why do we care about multlicast here while we don't care 3978 * about IPv4 multicast?? 3979 * XXX scope 3980 */ 3981 in6m = NULL; 3982 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3983 if (in6m) { 3984 IN6_IFADDR_RUNLOCK(); 3985 return 1; 3986 } 3987#endif 3988 } 3989 IN6_IFADDR_RUNLOCK(); 3990 3991 /* loopback, just for safety */ 3992 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3993 return 1; 3994 3995 return 0; 3996} 3997#endif /*INET6*/ 3998 3999/* 4000 * compare two secasindex structure. 4001 * flag can specify to compare 2 saidxes. 4002 * compare two secasindex structure without both mode and reqid. 4003 * don't compare port. 4004 * IN: 4005 * saidx0: source, it can be in SAD. 4006 * saidx1: object. 4007 * OUT: 4008 * 1 : equal 4009 * 0 : not equal 4010 */ 4011static int 4012key_cmpsaidx( 4013 const struct secasindex *saidx0, 4014 const struct secasindex *saidx1, 4015 int flag) 4016{ 4017 int chkport = 0; 4018 4019 /* sanity */ 4020 if (saidx0 == NULL && saidx1 == NULL) 4021 return 1; 4022 4023 if (saidx0 == NULL || saidx1 == NULL) 4024 return 0; 4025 4026 if (saidx0->proto != saidx1->proto) 4027 return 0; 4028 4029 if (flag == CMP_EXACTLY) { 4030 if (saidx0->mode != saidx1->mode) 4031 return 0; 4032 if (saidx0->reqid != saidx1->reqid) 4033 return 0; 4034 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4035 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4036 return 0; 4037 } else { 4038 4039 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4040 if (flag == CMP_MODE_REQID 4041 ||flag == CMP_REQID) { 4042 /* 4043 * If reqid of SPD is non-zero, unique SA is required. 4044 * The result must be of same reqid in this case. 4045 */ 4046 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4047 return 0; 4048 } 4049 4050 if (flag == CMP_MODE_REQID) { 4051 if (saidx0->mode != IPSEC_MODE_ANY 4052 && saidx0->mode != saidx1->mode) 4053 return 0; 4054 } 4055 4056#ifdef IPSEC_NAT_T 4057 /* 4058 * If NAT-T is enabled, check ports for tunnel mode. 4059 * Do not check ports if they are set to zero in the SPD. 4060 * Also do not do it for transport mode, as there is no 4061 * port information available in the SP. 4062 */ 4063 if (saidx1->mode == IPSEC_MODE_TUNNEL && 4064 saidx1->src.sa.sa_family == AF_INET && 4065 saidx1->dst.sa.sa_family == AF_INET && 4066 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 4067 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 4068 chkport = 1; 4069#endif /* IPSEC_NAT_T */ 4070 4071 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 4072 return 0; 4073 } 4074 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 4075 return 0; 4076 } 4077 } 4078 4079 return 1; 4080} 4081 4082/* 4083 * compare two secindex structure exactly. 4084 * IN: 4085 * spidx0: source, it is often in SPD. 4086 * spidx1: object, it is often from PFKEY message. 4087 * OUT: 4088 * 1 : equal 4089 * 0 : not equal 4090 */ 4091static int 4092key_cmpspidx_exactly( 4093 struct secpolicyindex *spidx0, 4094 struct secpolicyindex *spidx1) 4095{ 4096 /* sanity */ 4097 if (spidx0 == NULL && spidx1 == NULL) 4098 return 1; 4099 4100 if (spidx0 == NULL || spidx1 == NULL) 4101 return 0; 4102 4103 if (spidx0->prefs != spidx1->prefs 4104 || spidx0->prefd != spidx1->prefd 4105 || spidx0->ul_proto != spidx1->ul_proto) 4106 return 0; 4107 4108 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4109 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4110} 4111 4112/* 4113 * compare two secindex structure with mask. 4114 * IN: 4115 * spidx0: source, it is often in SPD. 4116 * spidx1: object, it is often from IP header. 4117 * OUT: 4118 * 1 : equal 4119 * 0 : not equal 4120 */ 4121static int 4122key_cmpspidx_withmask( 4123 struct secpolicyindex *spidx0, 4124 struct secpolicyindex *spidx1) 4125{ 4126 /* sanity */ 4127 if (spidx0 == NULL && spidx1 == NULL) 4128 return 1; 4129 4130 if (spidx0 == NULL || spidx1 == NULL) 4131 return 0; 4132 4133 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4134 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4135 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4136 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4137 return 0; 4138 4139 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4140 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4141 && spidx0->ul_proto != spidx1->ul_proto) 4142 return 0; 4143 4144 switch (spidx0->src.sa.sa_family) { 4145 case AF_INET: 4146 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4147 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4148 return 0; 4149 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4150 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4151 return 0; 4152 break; 4153 case AF_INET6: 4154 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4155 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4156 return 0; 4157 /* 4158 * scope_id check. if sin6_scope_id is 0, we regard it 4159 * as a wildcard scope, which matches any scope zone ID. 4160 */ 4161 if (spidx0->src.sin6.sin6_scope_id && 4162 spidx1->src.sin6.sin6_scope_id && 4163 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4164 return 0; 4165 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4166 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4167 return 0; 4168 break; 4169 default: 4170 /* XXX */ 4171 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4172 return 0; 4173 break; 4174 } 4175 4176 switch (spidx0->dst.sa.sa_family) { 4177 case AF_INET: 4178 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4179 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4180 return 0; 4181 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4182 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4183 return 0; 4184 break; 4185 case AF_INET6: 4186 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4187 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4188 return 0; 4189 /* 4190 * scope_id check. if sin6_scope_id is 0, we regard it 4191 * as a wildcard scope, which matches any scope zone ID. 4192 */ 4193 if (spidx0->dst.sin6.sin6_scope_id && 4194 spidx1->dst.sin6.sin6_scope_id && 4195 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4196 return 0; 4197 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4198 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4199 return 0; 4200 break; 4201 default: 4202 /* XXX */ 4203 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4204 return 0; 4205 break; 4206 } 4207 4208 /* XXX Do we check other field ? e.g. flowinfo */ 4209 4210 return 1; 4211} 4212 4213/* returns 0 on match */ 4214static int 4215key_sockaddrcmp( 4216 const struct sockaddr *sa1, 4217 const struct sockaddr *sa2, 4218 int port) 4219{ 4220#ifdef satosin 4221#undef satosin 4222#endif 4223#define satosin(s) ((const struct sockaddr_in *)s) 4224#ifdef satosin6 4225#undef satosin6 4226#endif 4227#define satosin6(s) ((const struct sockaddr_in6 *)s) 4228 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4229 return 1; 4230 4231 switch (sa1->sa_family) { 4232 case AF_INET: 4233 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4234 return 1; 4235 if (satosin(sa1)->sin_addr.s_addr != 4236 satosin(sa2)->sin_addr.s_addr) { 4237 return 1; 4238 } 4239 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4240 return 1; 4241 break; 4242 case AF_INET6: 4243 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4244 return 1; /*EINVAL*/ 4245 if (satosin6(sa1)->sin6_scope_id != 4246 satosin6(sa2)->sin6_scope_id) { 4247 return 1; 4248 } 4249 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4250 &satosin6(sa2)->sin6_addr)) { 4251 return 1; 4252 } 4253 if (port && 4254 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4255 return 1; 4256 } 4257 break; 4258 default: 4259 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4260 return 1; 4261 break; 4262 } 4263 4264 return 0; 4265#undef satosin 4266#undef satosin6 4267} 4268 4269/* 4270 * compare two buffers with mask. 4271 * IN: 4272 * addr1: source 4273 * addr2: object 4274 * bits: Number of bits to compare 4275 * OUT: 4276 * 1 : equal 4277 * 0 : not equal 4278 */ 4279static int 4280key_bbcmp(const void *a1, const void *a2, u_int bits) 4281{ 4282 const unsigned char *p1 = a1; 4283 const unsigned char *p2 = a2; 4284 4285 /* XXX: This could be considerably faster if we compare a word 4286 * at a time, but it is complicated on LSB Endian machines */ 4287 4288 /* Handle null pointers */ 4289 if (p1 == NULL || p2 == NULL) 4290 return (p1 == p2); 4291 4292 while (bits >= 8) { 4293 if (*p1++ != *p2++) 4294 return 0; 4295 bits -= 8; 4296 } 4297 4298 if (bits > 0) { 4299 u_int8_t mask = ~((1<<(8-bits))-1); 4300 if ((*p1 & mask) != (*p2 & mask)) 4301 return 0; 4302 } 4303 return 1; /* Match! */ 4304} 4305 4306static void 4307key_flush_spd(time_t now) 4308{ 4309 static u_int16_t sptree_scangen = 0; 4310 u_int16_t gen = sptree_scangen++; 4311 struct secpolicy *sp; 4312 u_int dir; 4313 4314 /* SPD */ 4315 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4316restart: 4317 SPTREE_LOCK(); 4318 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4319 if (sp->scangen == gen) /* previously handled */ 4320 continue; 4321 sp->scangen = gen; 4322 if (sp->state == IPSEC_SPSTATE_DEAD && 4323 sp->refcnt == 1) { 4324 /* 4325 * Ensure that we only decrease refcnt once, 4326 * when we're the last consumer. 4327 * Directly call SP_DELREF/key_delsp instead 4328 * of KEY_FREESP to avoid unlocking/relocking 4329 * SPTREE_LOCK before key_delsp: may refcnt 4330 * be increased again during that time ? 4331 * NB: also clean entries created by 4332 * key_spdflush 4333 */ 4334 SP_DELREF(sp); 4335 key_delsp(sp); 4336 SPTREE_UNLOCK(); 4337 goto restart; 4338 } 4339 if (sp->lifetime == 0 && sp->validtime == 0) 4340 continue; 4341 if ((sp->lifetime && now - sp->created > sp->lifetime) 4342 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4343 sp->state = IPSEC_SPSTATE_DEAD; 4344 SPTREE_UNLOCK(); 4345 key_spdexpire(sp); 4346 goto restart; 4347 } 4348 } 4349 SPTREE_UNLOCK(); 4350 } 4351} 4352 4353static void 4354key_flush_sad(time_t now) 4355{ 4356 struct secashead *sah, *nextsah; 4357 struct secasvar *sav, *nextsav; 4358 4359 /* SAD */ 4360 SAHTREE_LOCK(); 4361 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4362 /* if sah has been dead, then delete it and process next sah. */ 4363 if (sah->state == SADB_SASTATE_DEAD) { 4364 key_delsah(sah); 4365 continue; 4366 } 4367 4368 /* if LARVAL entry doesn't become MATURE, delete it. */ 4369 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4370 /* Need to also check refcnt for a larval SA ??? */ 4371 if (now - sav->created > V_key_larval_lifetime) 4372 KEY_FREESAV(&sav); 4373 } 4374 4375 /* 4376 * check MATURE entry to start to send expire message 4377 * whether or not. 4378 */ 4379 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4380 /* we don't need to check. */ 4381 if (sav->lft_s == NULL) 4382 continue; 4383 4384 /* sanity check */ 4385 if (sav->lft_c == NULL) { 4386 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4387 "time, why?\n", __func__)); 4388 continue; 4389 } 4390 4391 /* check SOFT lifetime */ 4392 if (sav->lft_s->addtime != 0 && 4393 now - sav->created > sav->lft_s->addtime) { 4394 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4395 /* 4396 * Actually, only send expire message if 4397 * SA has been used, as it was done before, 4398 * but should we always send such message, 4399 * and let IKE daemon decide if it should be 4400 * renegotiated or not ? 4401 * XXX expire message will actually NOT be 4402 * sent if SA is only used after soft 4403 * lifetime has been reached, see below 4404 * (DYING state) 4405 */ 4406 if (sav->lft_c->usetime != 0) 4407 key_expire(sav); 4408 } 4409 /* check SOFT lifetime by bytes */ 4410 /* 4411 * XXX I don't know the way to delete this SA 4412 * when new SA is installed. Caution when it's 4413 * installed too big lifetime by time. 4414 */ 4415 else if (sav->lft_s->bytes != 0 && 4416 sav->lft_s->bytes < sav->lft_c->bytes) { 4417 4418 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4419 /* 4420 * XXX If we keep to send expire 4421 * message in the status of 4422 * DYING. Do remove below code. 4423 */ 4424 key_expire(sav); 4425 } 4426 } 4427 4428 /* check DYING entry to change status to DEAD. */ 4429 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4430 /* we don't need to check. */ 4431 if (sav->lft_h == NULL) 4432 continue; 4433 4434 /* sanity check */ 4435 if (sav->lft_c == NULL) { 4436 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4437 "time, why?\n", __func__)); 4438 continue; 4439 } 4440 4441 if (sav->lft_h->addtime != 0 && 4442 now - sav->created > sav->lft_h->addtime) { 4443 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4444 KEY_FREESAV(&sav); 4445 } 4446#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4447 else if (sav->lft_s != NULL 4448 && sav->lft_s->addtime != 0 4449 && now - sav->created > sav->lft_s->addtime) { 4450 /* 4451 * XXX: should be checked to be 4452 * installed the valid SA. 4453 */ 4454 4455 /* 4456 * If there is no SA then sending 4457 * expire message. 4458 */ 4459 key_expire(sav); 4460 } 4461#endif 4462 /* check HARD lifetime by bytes */ 4463 else if (sav->lft_h->bytes != 0 && 4464 sav->lft_h->bytes < sav->lft_c->bytes) { 4465 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4466 KEY_FREESAV(&sav); 4467 } 4468 } 4469 4470 /* delete entry in DEAD */ 4471 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4472 /* sanity check */ 4473 if (sav->state != SADB_SASTATE_DEAD) { 4474 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4475 "(queue: %d SA: %d): kill it anyway\n", 4476 __func__, 4477 SADB_SASTATE_DEAD, sav->state)); 4478 } 4479 /* 4480 * do not call key_freesav() here. 4481 * sav should already be freed, and sav->refcnt 4482 * shows other references to sav 4483 * (such as from SPD). 4484 */ 4485 } 4486 } 4487 SAHTREE_UNLOCK(); 4488} 4489 4490static void 4491key_flush_acq(time_t now) 4492{ 4493 struct secacq *acq, *nextacq; 4494 4495 /* ACQ tree */ 4496 ACQ_LOCK(); 4497 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4498 nextacq = LIST_NEXT(acq, chain); 4499 if (now - acq->created > V_key_blockacq_lifetime 4500 && __LIST_CHAINED(acq)) { 4501 LIST_REMOVE(acq, chain); 4502 free(acq, M_IPSEC_SAQ); 4503 } 4504 } 4505 ACQ_UNLOCK(); 4506} 4507 4508static void 4509key_flush_spacq(time_t now) 4510{ 4511 struct secspacq *acq, *nextacq; 4512 4513 /* SP ACQ tree */ 4514 SPACQ_LOCK(); 4515 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4516 nextacq = LIST_NEXT(acq, chain); 4517 if (now - acq->created > V_key_blockacq_lifetime 4518 && __LIST_CHAINED(acq)) { 4519 LIST_REMOVE(acq, chain); 4520 free(acq, M_IPSEC_SAQ); 4521 } 4522 } 4523 SPACQ_UNLOCK(); 4524} 4525 4526/* 4527 * time handler. 4528 * scanning SPD and SAD to check status for each entries, 4529 * and do to remove or to expire. 4530 * XXX: year 2038 problem may remain. 4531 */ 4532void 4533key_timehandler(void) 4534{ 4535 VNET_ITERATOR_DECL(vnet_iter); 4536 time_t now = time_second; 4537 4538 VNET_LIST_RLOCK_NOSLEEP(); 4539 VNET_FOREACH(vnet_iter) { 4540 CURVNET_SET(vnet_iter); 4541 key_flush_spd(now); 4542 key_flush_sad(now); 4543 key_flush_acq(now); 4544 key_flush_spacq(now); 4545 CURVNET_RESTORE(); 4546 } 4547 VNET_LIST_RUNLOCK_NOSLEEP(); 4548 4549#ifndef IPSEC_DEBUG2 4550 /* do exchange to tick time !! */ 4551 (void)timeout((void *)key_timehandler, (void *)0, hz); 4552#endif /* IPSEC_DEBUG2 */ 4553} 4554 4555u_long 4556key_random() 4557{ 4558 u_long value; 4559 4560 key_randomfill(&value, sizeof(value)); 4561 return value; 4562} 4563 4564void 4565key_randomfill(p, l) 4566 void *p; 4567 size_t l; 4568{ 4569 size_t n; 4570 u_long v; 4571 static int warn = 1; 4572 4573 n = 0; 4574 n = (size_t)read_random(p, (u_int)l); 4575 /* last resort */ 4576 while (n < l) { 4577 v = random(); 4578 bcopy(&v, (u_int8_t *)p + n, 4579 l - n < sizeof(v) ? l - n : sizeof(v)); 4580 n += sizeof(v); 4581 4582 if (warn) { 4583 printf("WARNING: pseudo-random number generator " 4584 "used for IPsec processing\n"); 4585 warn = 0; 4586 } 4587 } 4588} 4589 4590/* 4591 * map SADB_SATYPE_* to IPPROTO_*. 4592 * if satype == SADB_SATYPE then satype is mapped to ~0. 4593 * OUT: 4594 * 0: invalid satype. 4595 */ 4596static u_int16_t 4597key_satype2proto(u_int8_t satype) 4598{ 4599 switch (satype) { 4600 case SADB_SATYPE_UNSPEC: 4601 return IPSEC_PROTO_ANY; 4602 case SADB_SATYPE_AH: 4603 return IPPROTO_AH; 4604 case SADB_SATYPE_ESP: 4605 return IPPROTO_ESP; 4606 case SADB_X_SATYPE_IPCOMP: 4607 return IPPROTO_IPCOMP; 4608 case SADB_X_SATYPE_TCPSIGNATURE: 4609 return IPPROTO_TCP; 4610 default: 4611 return 0; 4612 } 4613 /* NOTREACHED */ 4614} 4615 4616/* 4617 * map IPPROTO_* to SADB_SATYPE_* 4618 * OUT: 4619 * 0: invalid protocol type. 4620 */ 4621static u_int8_t 4622key_proto2satype(u_int16_t proto) 4623{ 4624 switch (proto) { 4625 case IPPROTO_AH: 4626 return SADB_SATYPE_AH; 4627 case IPPROTO_ESP: 4628 return SADB_SATYPE_ESP; 4629 case IPPROTO_IPCOMP: 4630 return SADB_X_SATYPE_IPCOMP; 4631 case IPPROTO_TCP: 4632 return SADB_X_SATYPE_TCPSIGNATURE; 4633 default: 4634 return 0; 4635 } 4636 /* NOTREACHED */ 4637} 4638 4639/* %%% PF_KEY */ 4640/* 4641 * SADB_GETSPI processing is to receive 4642 * <base, (SA2), src address, dst address, (SPI range)> 4643 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4644 * tree with the status of LARVAL, and send 4645 * <base, SA(*), address(SD)> 4646 * to the IKMPd. 4647 * 4648 * IN: mhp: pointer to the pointer to each header. 4649 * OUT: NULL if fail. 4650 * other if success, return pointer to the message to send. 4651 */ 4652static int 4653key_getspi(so, m, mhp) 4654 struct socket *so; 4655 struct mbuf *m; 4656 const struct sadb_msghdr *mhp; 4657{ 4658 struct sadb_address *src0, *dst0; 4659 struct secasindex saidx; 4660 struct secashead *newsah; 4661 struct secasvar *newsav; 4662 u_int8_t proto; 4663 u_int32_t spi; 4664 u_int8_t mode; 4665 u_int32_t reqid; 4666 int error; 4667 4668 IPSEC_ASSERT(so != NULL, ("null socket")); 4669 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4670 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4671 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4672 4673 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4674 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4675 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4676 __func__)); 4677 return key_senderror(so, m, EINVAL); 4678 } 4679 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4680 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4681 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4682 __func__)); 4683 return key_senderror(so, m, EINVAL); 4684 } 4685 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4686 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4687 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4688 } else { 4689 mode = IPSEC_MODE_ANY; 4690 reqid = 0; 4691 } 4692 4693 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4694 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4695 4696 /* map satype to proto */ 4697 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4698 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4699 __func__)); 4700 return key_senderror(so, m, EINVAL); 4701 } 4702 4703 /* 4704 * Make sure the port numbers are zero. 4705 * In case of NAT-T we will update them later if needed. 4706 */ 4707 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4708 case AF_INET: 4709 if (((struct sockaddr *)(src0 + 1))->sa_len != 4710 sizeof(struct sockaddr_in)) 4711 return key_senderror(so, m, EINVAL); 4712 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4713 break; 4714 case AF_INET6: 4715 if (((struct sockaddr *)(src0 + 1))->sa_len != 4716 sizeof(struct sockaddr_in6)) 4717 return key_senderror(so, m, EINVAL); 4718 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4719 break; 4720 default: 4721 ; /*???*/ 4722 } 4723 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4724 case AF_INET: 4725 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4726 sizeof(struct sockaddr_in)) 4727 return key_senderror(so, m, EINVAL); 4728 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4729 break; 4730 case AF_INET6: 4731 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4732 sizeof(struct sockaddr_in6)) 4733 return key_senderror(so, m, EINVAL); 4734 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4735 break; 4736 default: 4737 ; /*???*/ 4738 } 4739 4740 /* XXX boundary check against sa_len */ 4741 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4742 4743#ifdef IPSEC_NAT_T 4744 /* 4745 * Handle NAT-T info if present. 4746 * We made sure the port numbers are zero above, so we do 4747 * not have to worry in case we do not update them. 4748 */ 4749 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4750 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4751 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4752 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4753 4754 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4755 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4756 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4757 struct sadb_x_nat_t_type *type; 4758 struct sadb_x_nat_t_port *sport, *dport; 4759 4760 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4761 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4762 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4763 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4764 "passed.\n", __func__)); 4765 return key_senderror(so, m, EINVAL); 4766 } 4767 4768 sport = (struct sadb_x_nat_t_port *) 4769 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4770 dport = (struct sadb_x_nat_t_port *) 4771 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4772 4773 if (sport) 4774 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4775 if (dport) 4776 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4777 } 4778#endif 4779 4780 /* SPI allocation */ 4781 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4782 &saidx); 4783 if (spi == 0) 4784 return key_senderror(so, m, EINVAL); 4785 4786 /* get a SA index */ 4787 if ((newsah = key_getsah(&saidx)) == NULL) { 4788 /* create a new SA index */ 4789 if ((newsah = key_newsah(&saidx)) == NULL) { 4790 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4791 return key_senderror(so, m, ENOBUFS); 4792 } 4793 } 4794 4795 /* get a new SA */ 4796 /* XXX rewrite */ 4797 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4798 if (newsav == NULL) { 4799 /* XXX don't free new SA index allocated in above. */ 4800 return key_senderror(so, m, error); 4801 } 4802 4803 /* set spi */ 4804 newsav->spi = htonl(spi); 4805 4806 /* delete the entry in acqtree */ 4807 if (mhp->msg->sadb_msg_seq != 0) { 4808 struct secacq *acq; 4809 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4810 /* reset counter in order to deletion by timehandler. */ 4811 acq->created = time_second; 4812 acq->count = 0; 4813 } 4814 } 4815 4816 { 4817 struct mbuf *n, *nn; 4818 struct sadb_sa *m_sa; 4819 struct sadb_msg *newmsg; 4820 int off, len; 4821 4822 /* create new sadb_msg to reply. */ 4823 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4824 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4825 4826 MGETHDR(n, M_DONTWAIT, MT_DATA); 4827 if (len > MHLEN) { 4828 MCLGET(n, M_DONTWAIT); 4829 if ((n->m_flags & M_EXT) == 0) { 4830 m_freem(n); 4831 n = NULL; 4832 } 4833 } 4834 if (!n) 4835 return key_senderror(so, m, ENOBUFS); 4836 4837 n->m_len = len; 4838 n->m_next = NULL; 4839 off = 0; 4840 4841 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4842 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4843 4844 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4845 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4846 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4847 m_sa->sadb_sa_spi = htonl(spi); 4848 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4849 4850 IPSEC_ASSERT(off == len, 4851 ("length inconsistency (off %u len %u)", off, len)); 4852 4853 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4854 SADB_EXT_ADDRESS_DST); 4855 if (!n->m_next) { 4856 m_freem(n); 4857 return key_senderror(so, m, ENOBUFS); 4858 } 4859 4860 if (n->m_len < sizeof(struct sadb_msg)) { 4861 n = m_pullup(n, sizeof(struct sadb_msg)); 4862 if (n == NULL) 4863 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4864 } 4865 4866 n->m_pkthdr.len = 0; 4867 for (nn = n; nn; nn = nn->m_next) 4868 n->m_pkthdr.len += nn->m_len; 4869 4870 newmsg = mtod(n, struct sadb_msg *); 4871 newmsg->sadb_msg_seq = newsav->seq; 4872 newmsg->sadb_msg_errno = 0; 4873 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4874 4875 m_freem(m); 4876 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4877 } 4878} 4879 4880/* 4881 * allocating new SPI 4882 * called by key_getspi(). 4883 * OUT: 4884 * 0: failure. 4885 * others: success. 4886 */ 4887static u_int32_t 4888key_do_getnewspi(spirange, saidx) 4889 struct sadb_spirange *spirange; 4890 struct secasindex *saidx; 4891{ 4892 u_int32_t newspi; 4893 u_int32_t min, max; 4894 int count = V_key_spi_trycnt; 4895 4896 /* set spi range to allocate */ 4897 if (spirange != NULL) { 4898 min = spirange->sadb_spirange_min; 4899 max = spirange->sadb_spirange_max; 4900 } else { 4901 min = V_key_spi_minval; 4902 max = V_key_spi_maxval; 4903 } 4904 /* IPCOMP needs 2-byte SPI */ 4905 if (saidx->proto == IPPROTO_IPCOMP) { 4906 u_int32_t t; 4907 if (min >= 0x10000) 4908 min = 0xffff; 4909 if (max >= 0x10000) 4910 max = 0xffff; 4911 if (min > max) { 4912 t = min; min = max; max = t; 4913 } 4914 } 4915 4916 if (min == max) { 4917 if (key_checkspidup(saidx, min) != NULL) { 4918 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4919 __func__, min)); 4920 return 0; 4921 } 4922 4923 count--; /* taking one cost. */ 4924 newspi = min; 4925 4926 } else { 4927 4928 /* init SPI */ 4929 newspi = 0; 4930 4931 /* when requesting to allocate spi ranged */ 4932 while (count--) { 4933 /* generate pseudo-random SPI value ranged. */ 4934 newspi = min + (key_random() % (max - min + 1)); 4935 4936 if (key_checkspidup(saidx, newspi) == NULL) 4937 break; 4938 } 4939 4940 if (count == 0 || newspi == 0) { 4941 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4942 __func__)); 4943 return 0; 4944 } 4945 } 4946 4947 /* statistics */ 4948 keystat.getspi_count = 4949 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4950 4951 return newspi; 4952} 4953 4954/* 4955 * SADB_UPDATE processing 4956 * receive 4957 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4958 * key(AE), (identity(SD),) (sensitivity)> 4959 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4960 * and send 4961 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4962 * (identity(SD),) (sensitivity)> 4963 * to the ikmpd. 4964 * 4965 * m will always be freed. 4966 */ 4967static int 4968key_update(so, m, mhp) 4969 struct socket *so; 4970 struct mbuf *m; 4971 const struct sadb_msghdr *mhp; 4972{ 4973 struct sadb_sa *sa0; 4974 struct sadb_address *src0, *dst0; 4975#ifdef IPSEC_NAT_T 4976 struct sadb_x_nat_t_type *type; 4977 struct sadb_x_nat_t_port *sport, *dport; 4978 struct sadb_address *iaddr, *raddr; 4979 struct sadb_x_nat_t_frag *frag; 4980#endif 4981 struct secasindex saidx; 4982 struct secashead *sah; 4983 struct secasvar *sav; 4984 u_int16_t proto; 4985 u_int8_t mode; 4986 u_int32_t reqid; 4987 int error; 4988 4989 IPSEC_ASSERT(so != NULL, ("null socket")); 4990 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4991 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4992 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4993 4994 /* map satype to proto */ 4995 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4996 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4997 __func__)); 4998 return key_senderror(so, m, EINVAL); 4999 } 5000 5001 if (mhp->ext[SADB_EXT_SA] == NULL || 5002 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5003 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5004 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5005 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5006 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5007 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5008 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5009 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5010 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5011 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5012 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5013 __func__)); 5014 return key_senderror(so, m, EINVAL); 5015 } 5016 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5017 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5018 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5019 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5020 __func__)); 5021 return key_senderror(so, m, EINVAL); 5022 } 5023 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5024 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5025 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5026 } else { 5027 mode = IPSEC_MODE_ANY; 5028 reqid = 0; 5029 } 5030 /* XXX boundary checking for other extensions */ 5031 5032 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5033 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5034 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5035 5036 /* XXX boundary check against sa_len */ 5037 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5038 5039 /* 5040 * Make sure the port numbers are zero. 5041 * In case of NAT-T we will update them later if needed. 5042 */ 5043 KEY_PORTTOSADDR(&saidx.src, 0); 5044 KEY_PORTTOSADDR(&saidx.dst, 0); 5045 5046#ifdef IPSEC_NAT_T 5047 /* 5048 * Handle NAT-T info if present. 5049 */ 5050 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5051 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5052 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5053 5054 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5055 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5056 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5057 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5058 __func__)); 5059 return key_senderror(so, m, EINVAL); 5060 } 5061 5062 type = (struct sadb_x_nat_t_type *) 5063 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5064 sport = (struct sadb_x_nat_t_port *) 5065 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5066 dport = (struct sadb_x_nat_t_port *) 5067 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5068 } else { 5069 type = 0; 5070 sport = dport = 0; 5071 } 5072 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5073 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5074 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5075 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5076 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5077 __func__)); 5078 return key_senderror(so, m, EINVAL); 5079 } 5080 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5081 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5082 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5083 } else { 5084 iaddr = raddr = NULL; 5085 } 5086 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5087 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5088 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5089 __func__)); 5090 return key_senderror(so, m, EINVAL); 5091 } 5092 frag = (struct sadb_x_nat_t_frag *) 5093 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5094 } else { 5095 frag = 0; 5096 } 5097#endif 5098 5099 /* get a SA header */ 5100 if ((sah = key_getsah(&saidx)) == NULL) { 5101 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5102 return key_senderror(so, m, ENOENT); 5103 } 5104 5105 /* set spidx if there */ 5106 /* XXX rewrite */ 5107 error = key_setident(sah, m, mhp); 5108 if (error) 5109 return key_senderror(so, m, error); 5110 5111 /* find a SA with sequence number. */ 5112#ifdef IPSEC_DOSEQCHECK 5113 if (mhp->msg->sadb_msg_seq != 0 5114 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5115 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5116 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5117 return key_senderror(so, m, ENOENT); 5118 } 5119#else 5120 SAHTREE_LOCK(); 5121 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5122 SAHTREE_UNLOCK(); 5123 if (sav == NULL) { 5124 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5125 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5126 return key_senderror(so, m, EINVAL); 5127 } 5128#endif 5129 5130 /* validity check */ 5131 if (sav->sah->saidx.proto != proto) { 5132 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5133 "(DB=%u param=%u)\n", __func__, 5134 sav->sah->saidx.proto, proto)); 5135 return key_senderror(so, m, EINVAL); 5136 } 5137#ifdef IPSEC_DOSEQCHECK 5138 if (sav->spi != sa0->sadb_sa_spi) { 5139 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5140 __func__, 5141 (u_int32_t)ntohl(sav->spi), 5142 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5143 return key_senderror(so, m, EINVAL); 5144 } 5145#endif 5146 if (sav->pid != mhp->msg->sadb_msg_pid) { 5147 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5148 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5149 return key_senderror(so, m, EINVAL); 5150 } 5151 5152 /* copy sav values */ 5153 error = key_setsaval(sav, m, mhp); 5154 if (error) { 5155 KEY_FREESAV(&sav); 5156 return key_senderror(so, m, error); 5157 } 5158 5159 /* check SA values to be mature. */ 5160 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5161 KEY_FREESAV(&sav); 5162 return key_senderror(so, m, 0); 5163 } 5164 5165#ifdef IPSEC_NAT_T 5166 /* 5167 * Handle more NAT-T info if present, 5168 * now that we have a sav to fill. 5169 */ 5170 if (type) 5171 sav->natt_type = type->sadb_x_nat_t_type_type; 5172 5173 if (sport) 5174 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5175 sport->sadb_x_nat_t_port_port); 5176 if (dport) 5177 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5178 dport->sadb_x_nat_t_port_port); 5179 5180#if 0 5181 /* 5182 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5183 * We should actually check for a minimum MTU here, if we 5184 * want to support it in ip_output. 5185 */ 5186 if (frag) 5187 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5188#endif 5189#endif 5190 5191 { 5192 struct mbuf *n; 5193 5194 /* set msg buf from mhp */ 5195 n = key_getmsgbuf_x1(m, mhp); 5196 if (n == NULL) { 5197 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5198 return key_senderror(so, m, ENOBUFS); 5199 } 5200 5201 m_freem(m); 5202 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5203 } 5204} 5205 5206/* 5207 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5208 * only called by key_update(). 5209 * OUT: 5210 * NULL : not found 5211 * others : found, pointer to a SA. 5212 */ 5213#ifdef IPSEC_DOSEQCHECK 5214static struct secasvar * 5215key_getsavbyseq(sah, seq) 5216 struct secashead *sah; 5217 u_int32_t seq; 5218{ 5219 struct secasvar *sav; 5220 u_int state; 5221 5222 state = SADB_SASTATE_LARVAL; 5223 5224 /* search SAD with sequence number ? */ 5225 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5226 5227 KEY_CHKSASTATE(state, sav->state, __func__); 5228 5229 if (sav->seq == seq) { 5230 sa_addref(sav); 5231 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5232 printf("DP %s cause refcnt++:%d SA:%p\n", 5233 __func__, sav->refcnt, sav)); 5234 return sav; 5235 } 5236 } 5237 5238 return NULL; 5239} 5240#endif 5241 5242/* 5243 * SADB_ADD processing 5244 * add an entry to SA database, when received 5245 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5246 * key(AE), (identity(SD),) (sensitivity)> 5247 * from the ikmpd, 5248 * and send 5249 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5250 * (identity(SD),) (sensitivity)> 5251 * to the ikmpd. 5252 * 5253 * IGNORE identity and sensitivity messages. 5254 * 5255 * m will always be freed. 5256 */ 5257static int 5258key_add(so, m, mhp) 5259 struct socket *so; 5260 struct mbuf *m; 5261 const struct sadb_msghdr *mhp; 5262{ 5263 struct sadb_sa *sa0; 5264 struct sadb_address *src0, *dst0; 5265#ifdef IPSEC_NAT_T 5266 struct sadb_x_nat_t_type *type; 5267 struct sadb_address *iaddr, *raddr; 5268 struct sadb_x_nat_t_frag *frag; 5269#endif 5270 struct secasindex saidx; 5271 struct secashead *newsah; 5272 struct secasvar *newsav; 5273 u_int16_t proto; 5274 u_int8_t mode; 5275 u_int32_t reqid; 5276 int error; 5277 5278 IPSEC_ASSERT(so != NULL, ("null socket")); 5279 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5280 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5281 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5282 5283 /* map satype to proto */ 5284 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5285 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5286 __func__)); 5287 return key_senderror(so, m, EINVAL); 5288 } 5289 5290 if (mhp->ext[SADB_EXT_SA] == NULL || 5291 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5292 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5293 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5294 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5295 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5296 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5297 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5298 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5299 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5300 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5301 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5302 __func__)); 5303 return key_senderror(so, m, EINVAL); 5304 } 5305 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5306 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5307 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5308 /* XXX need more */ 5309 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5310 __func__)); 5311 return key_senderror(so, m, EINVAL); 5312 } 5313 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5314 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5315 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5316 } else { 5317 mode = IPSEC_MODE_ANY; 5318 reqid = 0; 5319 } 5320 5321 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5322 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5323 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5324 5325 /* XXX boundary check against sa_len */ 5326 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5327 5328 /* 5329 * Make sure the port numbers are zero. 5330 * In case of NAT-T we will update them later if needed. 5331 */ 5332 KEY_PORTTOSADDR(&saidx.src, 0); 5333 KEY_PORTTOSADDR(&saidx.dst, 0); 5334 5335#ifdef IPSEC_NAT_T 5336 /* 5337 * Handle NAT-T info if present. 5338 */ 5339 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5340 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5341 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5342 struct sadb_x_nat_t_port *sport, *dport; 5343 5344 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5345 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5346 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5347 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5348 __func__)); 5349 return key_senderror(so, m, EINVAL); 5350 } 5351 5352 type = (struct sadb_x_nat_t_type *) 5353 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5354 sport = (struct sadb_x_nat_t_port *) 5355 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5356 dport = (struct sadb_x_nat_t_port *) 5357 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5358 5359 if (sport) 5360 KEY_PORTTOSADDR(&saidx.src, 5361 sport->sadb_x_nat_t_port_port); 5362 if (dport) 5363 KEY_PORTTOSADDR(&saidx.dst, 5364 dport->sadb_x_nat_t_port_port); 5365 } else { 5366 type = 0; 5367 } 5368 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5369 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5370 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5371 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5372 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5373 __func__)); 5374 return key_senderror(so, m, EINVAL); 5375 } 5376 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5377 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5378 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5379 } else { 5380 iaddr = raddr = NULL; 5381 } 5382 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5383 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5384 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5385 __func__)); 5386 return key_senderror(so, m, EINVAL); 5387 } 5388 frag = (struct sadb_x_nat_t_frag *) 5389 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5390 } else { 5391 frag = 0; 5392 } 5393#endif 5394 5395 /* get a SA header */ 5396 if ((newsah = key_getsah(&saidx)) == NULL) { 5397 /* create a new SA header */ 5398 if ((newsah = key_newsah(&saidx)) == NULL) { 5399 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5400 return key_senderror(so, m, ENOBUFS); 5401 } 5402 } 5403 5404 /* set spidx if there */ 5405 /* XXX rewrite */ 5406 error = key_setident(newsah, m, mhp); 5407 if (error) { 5408 return key_senderror(so, m, error); 5409 } 5410 5411 /* create new SA entry. */ 5412 /* We can create new SA only if SPI is differenct. */ 5413 SAHTREE_LOCK(); 5414 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5415 SAHTREE_UNLOCK(); 5416 if (newsav != NULL) { 5417 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5418 return key_senderror(so, m, EEXIST); 5419 } 5420 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5421 if (newsav == NULL) { 5422 return key_senderror(so, m, error); 5423 } 5424 5425 /* check SA values to be mature. */ 5426 if ((error = key_mature(newsav)) != 0) { 5427 KEY_FREESAV(&newsav); 5428 return key_senderror(so, m, error); 5429 } 5430 5431#ifdef IPSEC_NAT_T 5432 /* 5433 * Handle more NAT-T info if present, 5434 * now that we have a sav to fill. 5435 */ 5436 if (type) 5437 newsav->natt_type = type->sadb_x_nat_t_type_type; 5438 5439#if 0 5440 /* 5441 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5442 * We should actually check for a minimum MTU here, if we 5443 * want to support it in ip_output. 5444 */ 5445 if (frag) 5446 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5447#endif 5448#endif 5449 5450 /* 5451 * don't call key_freesav() here, as we would like to keep the SA 5452 * in the database on success. 5453 */ 5454 5455 { 5456 struct mbuf *n; 5457 5458 /* set msg buf from mhp */ 5459 n = key_getmsgbuf_x1(m, mhp); 5460 if (n == NULL) { 5461 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5462 return key_senderror(so, m, ENOBUFS); 5463 } 5464 5465 m_freem(m); 5466 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5467 } 5468} 5469 5470/* m is retained */ 5471static int 5472key_setident(sah, m, mhp) 5473 struct secashead *sah; 5474 struct mbuf *m; 5475 const struct sadb_msghdr *mhp; 5476{ 5477 const struct sadb_ident *idsrc, *iddst; 5478 int idsrclen, iddstlen; 5479 5480 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5481 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5482 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5483 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5484 5485 /* don't make buffer if not there */ 5486 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5487 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5488 sah->idents = NULL; 5489 sah->identd = NULL; 5490 return 0; 5491 } 5492 5493 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5494 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5495 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5496 return EINVAL; 5497 } 5498 5499 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5500 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5501 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5502 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5503 5504 /* validity check */ 5505 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5506 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5507 return EINVAL; 5508 } 5509 5510 switch (idsrc->sadb_ident_type) { 5511 case SADB_IDENTTYPE_PREFIX: 5512 case SADB_IDENTTYPE_FQDN: 5513 case SADB_IDENTTYPE_USERFQDN: 5514 default: 5515 /* XXX do nothing */ 5516 sah->idents = NULL; 5517 sah->identd = NULL; 5518 return 0; 5519 } 5520 5521 /* make structure */ 5522 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5523 if (sah->idents == NULL) { 5524 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5525 return ENOBUFS; 5526 } 5527 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5528 if (sah->identd == NULL) { 5529 free(sah->idents, M_IPSEC_MISC); 5530 sah->idents = NULL; 5531 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5532 return ENOBUFS; 5533 } 5534 sah->idents->type = idsrc->sadb_ident_type; 5535 sah->idents->id = idsrc->sadb_ident_id; 5536 5537 sah->identd->type = iddst->sadb_ident_type; 5538 sah->identd->id = iddst->sadb_ident_id; 5539 5540 return 0; 5541} 5542 5543/* 5544 * m will not be freed on return. 5545 * it is caller's responsibility to free the result. 5546 */ 5547static struct mbuf * 5548key_getmsgbuf_x1(m, mhp) 5549 struct mbuf *m; 5550 const struct sadb_msghdr *mhp; 5551{ 5552 struct mbuf *n; 5553 5554 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5555 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5556 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5557 5558 /* create new sadb_msg to reply. */ 5559 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5560 SADB_EXT_SA, SADB_X_EXT_SA2, 5561 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5562 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5563 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5564 if (!n) 5565 return NULL; 5566 5567 if (n->m_len < sizeof(struct sadb_msg)) { 5568 n = m_pullup(n, sizeof(struct sadb_msg)); 5569 if (n == NULL) 5570 return NULL; 5571 } 5572 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5573 mtod(n, struct sadb_msg *)->sadb_msg_len = 5574 PFKEY_UNIT64(n->m_pkthdr.len); 5575 5576 return n; 5577} 5578 5579static int key_delete_all __P((struct socket *, struct mbuf *, 5580 const struct sadb_msghdr *, u_int16_t)); 5581 5582/* 5583 * SADB_DELETE processing 5584 * receive 5585 * <base, SA(*), address(SD)> 5586 * from the ikmpd, and set SADB_SASTATE_DEAD, 5587 * and send, 5588 * <base, SA(*), address(SD)> 5589 * to the ikmpd. 5590 * 5591 * m will always be freed. 5592 */ 5593static int 5594key_delete(so, m, mhp) 5595 struct socket *so; 5596 struct mbuf *m; 5597 const struct sadb_msghdr *mhp; 5598{ 5599 struct sadb_sa *sa0; 5600 struct sadb_address *src0, *dst0; 5601 struct secasindex saidx; 5602 struct secashead *sah; 5603 struct secasvar *sav = NULL; 5604 u_int16_t proto; 5605 5606 IPSEC_ASSERT(so != NULL, ("null socket")); 5607 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5608 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5609 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5610 5611 /* map satype to proto */ 5612 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5613 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5614 __func__)); 5615 return key_senderror(so, m, EINVAL); 5616 } 5617 5618 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5619 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5620 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5621 __func__)); 5622 return key_senderror(so, m, EINVAL); 5623 } 5624 5625 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5626 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5627 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5628 __func__)); 5629 return key_senderror(so, m, EINVAL); 5630 } 5631 5632 if (mhp->ext[SADB_EXT_SA] == NULL) { 5633 /* 5634 * Caller wants us to delete all non-LARVAL SAs 5635 * that match the src/dst. This is used during 5636 * IKE INITIAL-CONTACT. 5637 */ 5638 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5639 return key_delete_all(so, m, mhp, proto); 5640 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5641 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5642 __func__)); 5643 return key_senderror(so, m, EINVAL); 5644 } 5645 5646 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5647 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5648 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5649 5650 /* XXX boundary check against sa_len */ 5651 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5652 5653 /* 5654 * Make sure the port numbers are zero. 5655 * In case of NAT-T we will update them later if needed. 5656 */ 5657 KEY_PORTTOSADDR(&saidx.src, 0); 5658 KEY_PORTTOSADDR(&saidx.dst, 0); 5659 5660#ifdef IPSEC_NAT_T 5661 /* 5662 * Handle NAT-T info if present. 5663 */ 5664 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5665 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5666 struct sadb_x_nat_t_port *sport, *dport; 5667 5668 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5669 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5670 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5671 __func__)); 5672 return key_senderror(so, m, EINVAL); 5673 } 5674 5675 sport = (struct sadb_x_nat_t_port *) 5676 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5677 dport = (struct sadb_x_nat_t_port *) 5678 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5679 5680 if (sport) 5681 KEY_PORTTOSADDR(&saidx.src, 5682 sport->sadb_x_nat_t_port_port); 5683 if (dport) 5684 KEY_PORTTOSADDR(&saidx.dst, 5685 dport->sadb_x_nat_t_port_port); 5686 } 5687#endif 5688 5689 /* get a SA header */ 5690 SAHTREE_LOCK(); 5691 LIST_FOREACH(sah, &V_sahtree, chain) { 5692 if (sah->state == SADB_SASTATE_DEAD) 5693 continue; 5694 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5695 continue; 5696 5697 /* get a SA with SPI. */ 5698 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5699 if (sav) 5700 break; 5701 } 5702 if (sah == NULL) { 5703 SAHTREE_UNLOCK(); 5704 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5705 return key_senderror(so, m, ENOENT); 5706 } 5707 5708 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5709 SAHTREE_UNLOCK(); 5710 KEY_FREESAV(&sav); 5711 5712 { 5713 struct mbuf *n; 5714 struct sadb_msg *newmsg; 5715 5716 /* create new sadb_msg to reply. */ 5717 /* XXX-BZ NAT-T extensions? */ 5718 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5719 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5720 if (!n) 5721 return key_senderror(so, m, ENOBUFS); 5722 5723 if (n->m_len < sizeof(struct sadb_msg)) { 5724 n = m_pullup(n, sizeof(struct sadb_msg)); 5725 if (n == NULL) 5726 return key_senderror(so, m, ENOBUFS); 5727 } 5728 newmsg = mtod(n, struct sadb_msg *); 5729 newmsg->sadb_msg_errno = 0; 5730 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5731 5732 m_freem(m); 5733 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5734 } 5735} 5736 5737/* 5738 * delete all SAs for src/dst. Called from key_delete(). 5739 */ 5740static int 5741key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5742 u_int16_t proto) 5743{ 5744 struct sadb_address *src0, *dst0; 5745 struct secasindex saidx; 5746 struct secashead *sah; 5747 struct secasvar *sav, *nextsav; 5748 u_int stateidx, state; 5749 5750 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5751 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5752 5753 /* XXX boundary check against sa_len */ 5754 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5755 5756 /* 5757 * Make sure the port numbers are zero. 5758 * In case of NAT-T we will update them later if needed. 5759 */ 5760 KEY_PORTTOSADDR(&saidx.src, 0); 5761 KEY_PORTTOSADDR(&saidx.dst, 0); 5762 5763#ifdef IPSEC_NAT_T 5764 /* 5765 * Handle NAT-T info if present. 5766 */ 5767 5768 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5769 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5770 struct sadb_x_nat_t_port *sport, *dport; 5771 5772 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5773 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5774 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5775 __func__)); 5776 return key_senderror(so, m, EINVAL); 5777 } 5778 5779 sport = (struct sadb_x_nat_t_port *) 5780 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5781 dport = (struct sadb_x_nat_t_port *) 5782 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5783 5784 if (sport) 5785 KEY_PORTTOSADDR(&saidx.src, 5786 sport->sadb_x_nat_t_port_port); 5787 if (dport) 5788 KEY_PORTTOSADDR(&saidx.dst, 5789 dport->sadb_x_nat_t_port_port); 5790 } 5791#endif 5792 5793 SAHTREE_LOCK(); 5794 LIST_FOREACH(sah, &V_sahtree, chain) { 5795 if (sah->state == SADB_SASTATE_DEAD) 5796 continue; 5797 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5798 continue; 5799 5800 /* Delete all non-LARVAL SAs. */ 5801 for (stateidx = 0; 5802 stateidx < _ARRAYLEN(saorder_state_alive); 5803 stateidx++) { 5804 state = saorder_state_alive[stateidx]; 5805 if (state == SADB_SASTATE_LARVAL) 5806 continue; 5807 for (sav = LIST_FIRST(&sah->savtree[state]); 5808 sav != NULL; sav = nextsav) { 5809 nextsav = LIST_NEXT(sav, chain); 5810 /* sanity check */ 5811 if (sav->state != state) { 5812 ipseclog((LOG_DEBUG, "%s: invalid " 5813 "sav->state (queue %d SA %d)\n", 5814 __func__, state, sav->state)); 5815 continue; 5816 } 5817 5818 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5819 KEY_FREESAV(&sav); 5820 } 5821 } 5822 } 5823 SAHTREE_UNLOCK(); 5824 { 5825 struct mbuf *n; 5826 struct sadb_msg *newmsg; 5827 5828 /* create new sadb_msg to reply. */ 5829 /* XXX-BZ NAT-T extensions? */ 5830 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5831 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5832 if (!n) 5833 return key_senderror(so, m, ENOBUFS); 5834 5835 if (n->m_len < sizeof(struct sadb_msg)) { 5836 n = m_pullup(n, sizeof(struct sadb_msg)); 5837 if (n == NULL) 5838 return key_senderror(so, m, ENOBUFS); 5839 } 5840 newmsg = mtod(n, struct sadb_msg *); 5841 newmsg->sadb_msg_errno = 0; 5842 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5843 5844 m_freem(m); 5845 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5846 } 5847} 5848 5849/* 5850 * SADB_GET processing 5851 * receive 5852 * <base, SA(*), address(SD)> 5853 * from the ikmpd, and get a SP and a SA to respond, 5854 * and send, 5855 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5856 * (identity(SD),) (sensitivity)> 5857 * to the ikmpd. 5858 * 5859 * m will always be freed. 5860 */ 5861static int 5862key_get(so, m, mhp) 5863 struct socket *so; 5864 struct mbuf *m; 5865 const struct sadb_msghdr *mhp; 5866{ 5867 struct sadb_sa *sa0; 5868 struct sadb_address *src0, *dst0; 5869 struct secasindex saidx; 5870 struct secashead *sah; 5871 struct secasvar *sav = NULL; 5872 u_int16_t proto; 5873 5874 IPSEC_ASSERT(so != NULL, ("null socket")); 5875 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5876 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5877 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5878 5879 /* map satype to proto */ 5880 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5881 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5882 __func__)); 5883 return key_senderror(so, m, EINVAL); 5884 } 5885 5886 if (mhp->ext[SADB_EXT_SA] == NULL || 5887 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5888 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5889 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5890 __func__)); 5891 return key_senderror(so, m, EINVAL); 5892 } 5893 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5894 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5895 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5896 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5897 __func__)); 5898 return key_senderror(so, m, EINVAL); 5899 } 5900 5901 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5902 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5903 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5904 5905 /* XXX boundary check against sa_len */ 5906 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5907 5908 /* 5909 * Make sure the port numbers are zero. 5910 * In case of NAT-T we will update them later if needed. 5911 */ 5912 KEY_PORTTOSADDR(&saidx.src, 0); 5913 KEY_PORTTOSADDR(&saidx.dst, 0); 5914 5915#ifdef IPSEC_NAT_T 5916 /* 5917 * Handle NAT-T info if present. 5918 */ 5919 5920 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5921 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5922 struct sadb_x_nat_t_port *sport, *dport; 5923 5924 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5925 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5926 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5927 __func__)); 5928 return key_senderror(so, m, EINVAL); 5929 } 5930 5931 sport = (struct sadb_x_nat_t_port *) 5932 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5933 dport = (struct sadb_x_nat_t_port *) 5934 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5935 5936 if (sport) 5937 KEY_PORTTOSADDR(&saidx.src, 5938 sport->sadb_x_nat_t_port_port); 5939 if (dport) 5940 KEY_PORTTOSADDR(&saidx.dst, 5941 dport->sadb_x_nat_t_port_port); 5942 } 5943#endif 5944 5945 /* get a SA header */ 5946 SAHTREE_LOCK(); 5947 LIST_FOREACH(sah, &V_sahtree, chain) { 5948 if (sah->state == SADB_SASTATE_DEAD) 5949 continue; 5950 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5951 continue; 5952 5953 /* get a SA with SPI. */ 5954 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5955 if (sav) 5956 break; 5957 } 5958 SAHTREE_UNLOCK(); 5959 if (sah == NULL) { 5960 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5961 return key_senderror(so, m, ENOENT); 5962 } 5963 5964 { 5965 struct mbuf *n; 5966 u_int8_t satype; 5967 5968 /* map proto to satype */ 5969 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5970 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5971 __func__)); 5972 return key_senderror(so, m, EINVAL); 5973 } 5974 5975 /* create new sadb_msg to reply. */ 5976 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5977 mhp->msg->sadb_msg_pid); 5978 if (!n) 5979 return key_senderror(so, m, ENOBUFS); 5980 5981 m_freem(m); 5982 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5983 } 5984} 5985 5986/* XXX make it sysctl-configurable? */ 5987static void 5988key_getcomb_setlifetime(comb) 5989 struct sadb_comb *comb; 5990{ 5991 5992 comb->sadb_comb_soft_allocations = 1; 5993 comb->sadb_comb_hard_allocations = 1; 5994 comb->sadb_comb_soft_bytes = 0; 5995 comb->sadb_comb_hard_bytes = 0; 5996 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5997 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5998 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5999 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 6000} 6001 6002/* 6003 * XXX reorder combinations by preference 6004 * XXX no idea if the user wants ESP authentication or not 6005 */ 6006static struct mbuf * 6007key_getcomb_esp() 6008{ 6009 struct sadb_comb *comb; 6010 struct enc_xform *algo; 6011 struct mbuf *result = NULL, *m, *n; 6012 int encmin; 6013 int i, off, o; 6014 int totlen; 6015 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6016 6017 m = NULL; 6018 for (i = 1; i <= SADB_EALG_MAX; i++) { 6019 algo = esp_algorithm_lookup(i); 6020 if (algo == NULL) 6021 continue; 6022 6023 /* discard algorithms with key size smaller than system min */ 6024 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 6025 continue; 6026 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 6027 encmin = V_ipsec_esp_keymin; 6028 else 6029 encmin = _BITS(algo->minkey); 6030 6031 if (V_ipsec_esp_auth) 6032 m = key_getcomb_ah(); 6033 else { 6034 IPSEC_ASSERT(l <= MLEN, 6035 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6036 MGET(m, M_DONTWAIT, MT_DATA); 6037 if (m) { 6038 M_ALIGN(m, l); 6039 m->m_len = l; 6040 m->m_next = NULL; 6041 bzero(mtod(m, caddr_t), m->m_len); 6042 } 6043 } 6044 if (!m) 6045 goto fail; 6046 6047 totlen = 0; 6048 for (n = m; n; n = n->m_next) 6049 totlen += n->m_len; 6050 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 6051 6052 for (off = 0; off < totlen; off += l) { 6053 n = m_pulldown(m, off, l, &o); 6054 if (!n) { 6055 /* m is already freed */ 6056 goto fail; 6057 } 6058 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 6059 bzero(comb, sizeof(*comb)); 6060 key_getcomb_setlifetime(comb); 6061 comb->sadb_comb_encrypt = i; 6062 comb->sadb_comb_encrypt_minbits = encmin; 6063 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 6064 } 6065 6066 if (!result) 6067 result = m; 6068 else 6069 m_cat(result, m); 6070 } 6071 6072 return result; 6073 6074 fail: 6075 if (result) 6076 m_freem(result); 6077 return NULL; 6078} 6079 6080static void 6081key_getsizes_ah( 6082 const struct auth_hash *ah, 6083 int alg, 6084 u_int16_t* min, 6085 u_int16_t* max) 6086{ 6087 6088 *min = *max = ah->keysize; 6089 if (ah->keysize == 0) { 6090 /* 6091 * Transform takes arbitrary key size but algorithm 6092 * key size is restricted. Enforce this here. 6093 */ 6094 switch (alg) { 6095 case SADB_X_AALG_MD5: *min = *max = 16; break; 6096 case SADB_X_AALG_SHA: *min = *max = 20; break; 6097 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 6098 default: 6099 DPRINTF(("%s: unknown AH algorithm %u\n", 6100 __func__, alg)); 6101 break; 6102 } 6103 } 6104} 6105 6106/* 6107 * XXX reorder combinations by preference 6108 */ 6109static struct mbuf * 6110key_getcomb_ah() 6111{ 6112 struct sadb_comb *comb; 6113 struct auth_hash *algo; 6114 struct mbuf *m; 6115 u_int16_t minkeysize, maxkeysize; 6116 int i; 6117 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6118 6119 m = NULL; 6120 for (i = 1; i <= SADB_AALG_MAX; i++) { 6121#if 1 6122 /* we prefer HMAC algorithms, not old algorithms */ 6123 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 6124 continue; 6125#endif 6126 algo = ah_algorithm_lookup(i); 6127 if (!algo) 6128 continue; 6129 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6130 /* discard algorithms with key size smaller than system min */ 6131 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6132 continue; 6133 6134 if (!m) { 6135 IPSEC_ASSERT(l <= MLEN, 6136 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6137 MGET(m, M_DONTWAIT, MT_DATA); 6138 if (m) { 6139 M_ALIGN(m, l); 6140 m->m_len = l; 6141 m->m_next = NULL; 6142 } 6143 } else 6144 M_PREPEND(m, l, M_DONTWAIT); 6145 if (!m) 6146 return NULL; 6147 6148 comb = mtod(m, struct sadb_comb *); 6149 bzero(comb, sizeof(*comb)); 6150 key_getcomb_setlifetime(comb); 6151 comb->sadb_comb_auth = i; 6152 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6153 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6154 } 6155 6156 return m; 6157} 6158 6159/* 6160 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6161 * XXX reorder combinations by preference 6162 */ 6163static struct mbuf * 6164key_getcomb_ipcomp() 6165{ 6166 struct sadb_comb *comb; 6167 struct comp_algo *algo; 6168 struct mbuf *m; 6169 int i; 6170 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6171 6172 m = NULL; 6173 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6174 algo = ipcomp_algorithm_lookup(i); 6175 if (!algo) 6176 continue; 6177 6178 if (!m) { 6179 IPSEC_ASSERT(l <= MLEN, 6180 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6181 MGET(m, M_DONTWAIT, MT_DATA); 6182 if (m) { 6183 M_ALIGN(m, l); 6184 m->m_len = l; 6185 m->m_next = NULL; 6186 } 6187 } else 6188 M_PREPEND(m, l, M_DONTWAIT); 6189 if (!m) 6190 return NULL; 6191 6192 comb = mtod(m, struct sadb_comb *); 6193 bzero(comb, sizeof(*comb)); 6194 key_getcomb_setlifetime(comb); 6195 comb->sadb_comb_encrypt = i; 6196 /* what should we set into sadb_comb_*_{min,max}bits? */ 6197 } 6198 6199 return m; 6200} 6201 6202/* 6203 * XXX no way to pass mode (transport/tunnel) to userland 6204 * XXX replay checking? 6205 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6206 */ 6207static struct mbuf * 6208key_getprop(saidx) 6209 const struct secasindex *saidx; 6210{ 6211 struct sadb_prop *prop; 6212 struct mbuf *m, *n; 6213 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6214 int totlen; 6215 6216 switch (saidx->proto) { 6217 case IPPROTO_ESP: 6218 m = key_getcomb_esp(); 6219 break; 6220 case IPPROTO_AH: 6221 m = key_getcomb_ah(); 6222 break; 6223 case IPPROTO_IPCOMP: 6224 m = key_getcomb_ipcomp(); 6225 break; 6226 default: 6227 return NULL; 6228 } 6229 6230 if (!m) 6231 return NULL; 6232 M_PREPEND(m, l, M_DONTWAIT); 6233 if (!m) 6234 return NULL; 6235 6236 totlen = 0; 6237 for (n = m; n; n = n->m_next) 6238 totlen += n->m_len; 6239 6240 prop = mtod(m, struct sadb_prop *); 6241 bzero(prop, sizeof(*prop)); 6242 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6243 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6244 prop->sadb_prop_replay = 32; /* XXX */ 6245 6246 return m; 6247} 6248 6249/* 6250 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6251 * send 6252 * <base, SA, address(SD), (address(P)), x_policy, 6253 * (identity(SD),) (sensitivity,) proposal> 6254 * to KMD, and expect to receive 6255 * <base> with SADB_ACQUIRE if error occured, 6256 * or 6257 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6258 * from KMD by PF_KEY. 6259 * 6260 * XXX x_policy is outside of RFC2367 (KAME extension). 6261 * XXX sensitivity is not supported. 6262 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6263 * see comment for key_getcomb_ipcomp(). 6264 * 6265 * OUT: 6266 * 0 : succeed 6267 * others: error number 6268 */ 6269static int 6270key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6271{ 6272 struct mbuf *result = NULL, *m; 6273 struct secacq *newacq; 6274 u_int8_t satype; 6275 int error = -1; 6276 u_int32_t seq; 6277 6278 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6279 satype = key_proto2satype(saidx->proto); 6280 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6281 6282 /* 6283 * We never do anything about acquirng SA. There is anather 6284 * solution that kernel blocks to send SADB_ACQUIRE message until 6285 * getting something message from IKEd. In later case, to be 6286 * managed with ACQUIRING list. 6287 */ 6288 /* Get an entry to check whether sending message or not. */ 6289 if ((newacq = key_getacq(saidx)) != NULL) { 6290 if (V_key_blockacq_count < newacq->count) { 6291 /* reset counter and do send message. */ 6292 newacq->count = 0; 6293 } else { 6294 /* increment counter and do nothing. */ 6295 newacq->count++; 6296 return 0; 6297 } 6298 } else { 6299 /* make new entry for blocking to send SADB_ACQUIRE. */ 6300 if ((newacq = key_newacq(saidx)) == NULL) 6301 return ENOBUFS; 6302 } 6303 6304 6305 seq = newacq->seq; 6306 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6307 if (!m) { 6308 error = ENOBUFS; 6309 goto fail; 6310 } 6311 result = m; 6312 6313 /* 6314 * No SADB_X_EXT_NAT_T_* here: we do not know 6315 * anything related to NAT-T at this time. 6316 */ 6317 6318 /* set sadb_address for saidx's. */ 6319 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6320 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6321 if (!m) { 6322 error = ENOBUFS; 6323 goto fail; 6324 } 6325 m_cat(result, m); 6326 6327 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6328 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6329 if (!m) { 6330 error = ENOBUFS; 6331 goto fail; 6332 } 6333 m_cat(result, m); 6334 6335 /* XXX proxy address (optional) */ 6336 6337 /* set sadb_x_policy */ 6338 if (sp) { 6339 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6340 if (!m) { 6341 error = ENOBUFS; 6342 goto fail; 6343 } 6344 m_cat(result, m); 6345 } 6346 6347 /* XXX identity (optional) */ 6348#if 0 6349 if (idexttype && fqdn) { 6350 /* create identity extension (FQDN) */ 6351 struct sadb_ident *id; 6352 int fqdnlen; 6353 6354 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6355 id = (struct sadb_ident *)p; 6356 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6357 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6358 id->sadb_ident_exttype = idexttype; 6359 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6360 bcopy(fqdn, id + 1, fqdnlen); 6361 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6362 } 6363 6364 if (idexttype) { 6365 /* create identity extension (USERFQDN) */ 6366 struct sadb_ident *id; 6367 int userfqdnlen; 6368 6369 if (userfqdn) { 6370 /* +1 for terminating-NUL */ 6371 userfqdnlen = strlen(userfqdn) + 1; 6372 } else 6373 userfqdnlen = 0; 6374 id = (struct sadb_ident *)p; 6375 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6376 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6377 id->sadb_ident_exttype = idexttype; 6378 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6379 /* XXX is it correct? */ 6380 if (curproc && curproc->p_cred) 6381 id->sadb_ident_id = curproc->p_cred->p_ruid; 6382 if (userfqdn && userfqdnlen) 6383 bcopy(userfqdn, id + 1, userfqdnlen); 6384 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6385 } 6386#endif 6387 6388 /* XXX sensitivity (optional) */ 6389 6390 /* create proposal/combination extension */ 6391 m = key_getprop(saidx); 6392#if 0 6393 /* 6394 * spec conformant: always attach proposal/combination extension, 6395 * the problem is that we have no way to attach it for ipcomp, 6396 * due to the way sadb_comb is declared in RFC2367. 6397 */ 6398 if (!m) { 6399 error = ENOBUFS; 6400 goto fail; 6401 } 6402 m_cat(result, m); 6403#else 6404 /* 6405 * outside of spec; make proposal/combination extension optional. 6406 */ 6407 if (m) 6408 m_cat(result, m); 6409#endif 6410 6411 if ((result->m_flags & M_PKTHDR) == 0) { 6412 error = EINVAL; 6413 goto fail; 6414 } 6415 6416 if (result->m_len < sizeof(struct sadb_msg)) { 6417 result = m_pullup(result, sizeof(struct sadb_msg)); 6418 if (result == NULL) { 6419 error = ENOBUFS; 6420 goto fail; 6421 } 6422 } 6423 6424 result->m_pkthdr.len = 0; 6425 for (m = result; m; m = m->m_next) 6426 result->m_pkthdr.len += m->m_len; 6427 6428 mtod(result, struct sadb_msg *)->sadb_msg_len = 6429 PFKEY_UNIT64(result->m_pkthdr.len); 6430 6431 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6432 6433 fail: 6434 if (result) 6435 m_freem(result); 6436 return error; 6437} 6438 6439static struct secacq * 6440key_newacq(const struct secasindex *saidx) 6441{ 6442 struct secacq *newacq; 6443 6444 /* get new entry */ 6445 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6446 if (newacq == NULL) { 6447 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6448 return NULL; 6449 } 6450 6451 /* copy secindex */ 6452 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6453 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6454 newacq->created = time_second; 6455 newacq->count = 0; 6456 6457 /* add to acqtree */ 6458 ACQ_LOCK(); 6459 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6460 ACQ_UNLOCK(); 6461 6462 return newacq; 6463} 6464 6465static struct secacq * 6466key_getacq(const struct secasindex *saidx) 6467{ 6468 struct secacq *acq; 6469 6470 ACQ_LOCK(); 6471 LIST_FOREACH(acq, &V_acqtree, chain) { 6472 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6473 break; 6474 } 6475 ACQ_UNLOCK(); 6476 6477 return acq; 6478} 6479 6480static struct secacq * 6481key_getacqbyseq(seq) 6482 u_int32_t seq; 6483{ 6484 struct secacq *acq; 6485 6486 ACQ_LOCK(); 6487 LIST_FOREACH(acq, &V_acqtree, chain) { 6488 if (acq->seq == seq) 6489 break; 6490 } 6491 ACQ_UNLOCK(); 6492 6493 return acq; 6494} 6495 6496static struct secspacq * 6497key_newspacq(spidx) 6498 struct secpolicyindex *spidx; 6499{ 6500 struct secspacq *acq; 6501 6502 /* get new entry */ 6503 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6504 if (acq == NULL) { 6505 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6506 return NULL; 6507 } 6508 6509 /* copy secindex */ 6510 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6511 acq->created = time_second; 6512 acq->count = 0; 6513 6514 /* add to spacqtree */ 6515 SPACQ_LOCK(); 6516 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6517 SPACQ_UNLOCK(); 6518 6519 return acq; 6520} 6521 6522static struct secspacq * 6523key_getspacq(spidx) 6524 struct secpolicyindex *spidx; 6525{ 6526 struct secspacq *acq; 6527 6528 SPACQ_LOCK(); 6529 LIST_FOREACH(acq, &V_spacqtree, chain) { 6530 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6531 /* NB: return holding spacq_lock */ 6532 return acq; 6533 } 6534 } 6535 SPACQ_UNLOCK(); 6536 6537 return NULL; 6538} 6539 6540/* 6541 * SADB_ACQUIRE processing, 6542 * in first situation, is receiving 6543 * <base> 6544 * from the ikmpd, and clear sequence of its secasvar entry. 6545 * 6546 * In second situation, is receiving 6547 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6548 * from a user land process, and return 6549 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6550 * to the socket. 6551 * 6552 * m will always be freed. 6553 */ 6554static int 6555key_acquire2(so, m, mhp) 6556 struct socket *so; 6557 struct mbuf *m; 6558 const struct sadb_msghdr *mhp; 6559{ 6560 const struct sadb_address *src0, *dst0; 6561 struct secasindex saidx; 6562 struct secashead *sah; 6563 u_int16_t proto; 6564 int error; 6565 6566 IPSEC_ASSERT(so != NULL, ("null socket")); 6567 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6568 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6569 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6570 6571 /* 6572 * Error message from KMd. 6573 * We assume that if error was occured in IKEd, the length of PFKEY 6574 * message is equal to the size of sadb_msg structure. 6575 * We do not raise error even if error occured in this function. 6576 */ 6577 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6578 struct secacq *acq; 6579 6580 /* check sequence number */ 6581 if (mhp->msg->sadb_msg_seq == 0) { 6582 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6583 "number.\n", __func__)); 6584 m_freem(m); 6585 return 0; 6586 } 6587 6588 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6589 /* 6590 * the specified larval SA is already gone, or we got 6591 * a bogus sequence number. we can silently ignore it. 6592 */ 6593 m_freem(m); 6594 return 0; 6595 } 6596 6597 /* reset acq counter in order to deletion by timehander. */ 6598 acq->created = time_second; 6599 acq->count = 0; 6600 m_freem(m); 6601 return 0; 6602 } 6603 6604 /* 6605 * This message is from user land. 6606 */ 6607 6608 /* map satype to proto */ 6609 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6610 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6611 __func__)); 6612 return key_senderror(so, m, EINVAL); 6613 } 6614 6615 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6616 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6617 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6618 /* error */ 6619 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6620 __func__)); 6621 return key_senderror(so, m, EINVAL); 6622 } 6623 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6624 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6625 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6626 /* error */ 6627 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6628 __func__)); 6629 return key_senderror(so, m, EINVAL); 6630 } 6631 6632 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6633 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6634 6635 /* XXX boundary check against sa_len */ 6636 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6637 6638 /* 6639 * Make sure the port numbers are zero. 6640 * In case of NAT-T we will update them later if needed. 6641 */ 6642 KEY_PORTTOSADDR(&saidx.src, 0); 6643 KEY_PORTTOSADDR(&saidx.dst, 0); 6644 6645#ifndef IPSEC_NAT_T 6646 /* 6647 * Handle NAT-T info if present. 6648 */ 6649 6650 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6651 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6652 struct sadb_x_nat_t_port *sport, *dport; 6653 6654 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6655 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6656 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6657 __func__)); 6658 return key_senderror(so, m, EINVAL); 6659 } 6660 6661 sport = (struct sadb_x_nat_t_port *) 6662 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6663 dport = (struct sadb_x_nat_t_port *) 6664 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6665 6666 if (sport) 6667 KEY_PORTTOSADDR(&saidx.src, 6668 sport->sadb_x_nat_t_port_port); 6669 if (dport) 6670 KEY_PORTTOSADDR(&saidx.dst, 6671 dport->sadb_x_nat_t_port_port); 6672 } 6673#endif 6674 6675 /* get a SA index */ 6676 SAHTREE_LOCK(); 6677 LIST_FOREACH(sah, &V_sahtree, chain) { 6678 if (sah->state == SADB_SASTATE_DEAD) 6679 continue; 6680 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6681 break; 6682 } 6683 SAHTREE_UNLOCK(); 6684 if (sah != NULL) { 6685 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6686 return key_senderror(so, m, EEXIST); 6687 } 6688 6689 error = key_acquire(&saidx, NULL); 6690 if (error != 0) { 6691 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6692 __func__, mhp->msg->sadb_msg_errno)); 6693 return key_senderror(so, m, error); 6694 } 6695 6696 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6697} 6698 6699/* 6700 * SADB_REGISTER processing. 6701 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6702 * receive 6703 * <base> 6704 * from the ikmpd, and register a socket to send PF_KEY messages, 6705 * and send 6706 * <base, supported> 6707 * to KMD by PF_KEY. 6708 * If socket is detached, must free from regnode. 6709 * 6710 * m will always be freed. 6711 */ 6712static int 6713key_register(so, m, mhp) 6714 struct socket *so; 6715 struct mbuf *m; 6716 const struct sadb_msghdr *mhp; 6717{ 6718 struct secreg *reg, *newreg = 0; 6719 6720 IPSEC_ASSERT(so != NULL, ("null socket")); 6721 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6722 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6723 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6724 6725 /* check for invalid register message */ 6726 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6727 return key_senderror(so, m, EINVAL); 6728 6729 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6730 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6731 goto setmsg; 6732 6733 /* check whether existing or not */ 6734 REGTREE_LOCK(); 6735 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6736 if (reg->so == so) { 6737 REGTREE_UNLOCK(); 6738 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6739 __func__)); 6740 return key_senderror(so, m, EEXIST); 6741 } 6742 } 6743 6744 /* create regnode */ 6745 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6746 if (newreg == NULL) { 6747 REGTREE_UNLOCK(); 6748 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6749 return key_senderror(so, m, ENOBUFS); 6750 } 6751 6752 newreg->so = so; 6753 ((struct keycb *)sotorawcb(so))->kp_registered++; 6754 6755 /* add regnode to regtree. */ 6756 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6757 REGTREE_UNLOCK(); 6758 6759 setmsg: 6760 { 6761 struct mbuf *n; 6762 struct sadb_msg *newmsg; 6763 struct sadb_supported *sup; 6764 u_int len, alen, elen; 6765 int off; 6766 int i; 6767 struct sadb_alg *alg; 6768 6769 /* create new sadb_msg to reply. */ 6770 alen = 0; 6771 for (i = 1; i <= SADB_AALG_MAX; i++) { 6772 if (ah_algorithm_lookup(i)) 6773 alen += sizeof(struct sadb_alg); 6774 } 6775 if (alen) 6776 alen += sizeof(struct sadb_supported); 6777 elen = 0; 6778 for (i = 1; i <= SADB_EALG_MAX; i++) { 6779 if (esp_algorithm_lookup(i)) 6780 elen += sizeof(struct sadb_alg); 6781 } 6782 if (elen) 6783 elen += sizeof(struct sadb_supported); 6784 6785 len = sizeof(struct sadb_msg) + alen + elen; 6786 6787 if (len > MCLBYTES) 6788 return key_senderror(so, m, ENOBUFS); 6789 6790 MGETHDR(n, M_DONTWAIT, MT_DATA); 6791 if (len > MHLEN) { 6792 MCLGET(n, M_DONTWAIT); 6793 if ((n->m_flags & M_EXT) == 0) { 6794 m_freem(n); 6795 n = NULL; 6796 } 6797 } 6798 if (!n) 6799 return key_senderror(so, m, ENOBUFS); 6800 6801 n->m_pkthdr.len = n->m_len = len; 6802 n->m_next = NULL; 6803 off = 0; 6804 6805 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6806 newmsg = mtod(n, struct sadb_msg *); 6807 newmsg->sadb_msg_errno = 0; 6808 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6809 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6810 6811 /* for authentication algorithm */ 6812 if (alen) { 6813 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6814 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6815 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6816 off += PFKEY_ALIGN8(sizeof(*sup)); 6817 6818 for (i = 1; i <= SADB_AALG_MAX; i++) { 6819 struct auth_hash *aalgo; 6820 u_int16_t minkeysize, maxkeysize; 6821 6822 aalgo = ah_algorithm_lookup(i); 6823 if (!aalgo) 6824 continue; 6825 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6826 alg->sadb_alg_id = i; 6827 alg->sadb_alg_ivlen = 0; 6828 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6829 alg->sadb_alg_minbits = _BITS(minkeysize); 6830 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6831 off += PFKEY_ALIGN8(sizeof(*alg)); 6832 } 6833 } 6834 6835 /* for encryption algorithm */ 6836 if (elen) { 6837 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6838 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6839 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6840 off += PFKEY_ALIGN8(sizeof(*sup)); 6841 6842 for (i = 1; i <= SADB_EALG_MAX; i++) { 6843 struct enc_xform *ealgo; 6844 6845 ealgo = esp_algorithm_lookup(i); 6846 if (!ealgo) 6847 continue; 6848 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6849 alg->sadb_alg_id = i; 6850 alg->sadb_alg_ivlen = ealgo->blocksize; 6851 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6852 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6853 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6854 } 6855 } 6856 6857 IPSEC_ASSERT(off == len, 6858 ("length assumption failed (off %u len %u)", off, len)); 6859 6860 m_freem(m); 6861 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6862 } 6863} 6864 6865/* 6866 * free secreg entry registered. 6867 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6868 */ 6869void 6870key_freereg(struct socket *so) 6871{ 6872 struct secreg *reg; 6873 int i; 6874 6875 IPSEC_ASSERT(so != NULL, ("NULL so")); 6876 6877 /* 6878 * check whether existing or not. 6879 * check all type of SA, because there is a potential that 6880 * one socket is registered to multiple type of SA. 6881 */ 6882 REGTREE_LOCK(); 6883 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6884 LIST_FOREACH(reg, &V_regtree[i], chain) { 6885 if (reg->so == so && __LIST_CHAINED(reg)) { 6886 LIST_REMOVE(reg, chain); 6887 free(reg, M_IPSEC_SAR); 6888 break; 6889 } 6890 } 6891 } 6892 REGTREE_UNLOCK(); 6893} 6894 6895/* 6896 * SADB_EXPIRE processing 6897 * send 6898 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6899 * to KMD by PF_KEY. 6900 * NOTE: We send only soft lifetime extension. 6901 * 6902 * OUT: 0 : succeed 6903 * others : error number 6904 */ 6905static int 6906key_expire(struct secasvar *sav) 6907{ 6908 int s; 6909 int satype; 6910 struct mbuf *result = NULL, *m; 6911 int len; 6912 int error = -1; 6913 struct sadb_lifetime *lt; 6914 6915 /* XXX: Why do we lock ? */ 6916 s = splnet(); /*called from softclock()*/ 6917 6918 IPSEC_ASSERT (sav != NULL, ("null sav")); 6919 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6920 6921 /* set msg header */ 6922 satype = key_proto2satype(sav->sah->saidx.proto); 6923 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6924 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6925 if (!m) { 6926 error = ENOBUFS; 6927 goto fail; 6928 } 6929 result = m; 6930 6931 /* create SA extension */ 6932 m = key_setsadbsa(sav); 6933 if (!m) { 6934 error = ENOBUFS; 6935 goto fail; 6936 } 6937 m_cat(result, m); 6938 6939 /* create SA extension */ 6940 m = key_setsadbxsa2(sav->sah->saidx.mode, 6941 sav->replay ? sav->replay->count : 0, 6942 sav->sah->saidx.reqid); 6943 if (!m) { 6944 error = ENOBUFS; 6945 goto fail; 6946 } 6947 m_cat(result, m); 6948 6949 /* create lifetime extension (current and soft) */ 6950 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6951 m = key_alloc_mbuf(len); 6952 if (!m || m->m_next) { /*XXX*/ 6953 if (m) 6954 m_freem(m); 6955 error = ENOBUFS; 6956 goto fail; 6957 } 6958 bzero(mtod(m, caddr_t), len); 6959 lt = mtod(m, struct sadb_lifetime *); 6960 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6961 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6962 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6963 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6964 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6965 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6966 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6967 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6968 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6969 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6970 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6971 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6972 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6973 m_cat(result, m); 6974 6975 /* set sadb_address for source */ 6976 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6977 &sav->sah->saidx.src.sa, 6978 FULLMASK, IPSEC_ULPROTO_ANY); 6979 if (!m) { 6980 error = ENOBUFS; 6981 goto fail; 6982 } 6983 m_cat(result, m); 6984 6985 /* set sadb_address for destination */ 6986 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6987 &sav->sah->saidx.dst.sa, 6988 FULLMASK, IPSEC_ULPROTO_ANY); 6989 if (!m) { 6990 error = ENOBUFS; 6991 goto fail; 6992 } 6993 m_cat(result, m); 6994 6995 /* 6996 * XXX-BZ Handle NAT-T extensions here. 6997 */ 6998 6999 if ((result->m_flags & M_PKTHDR) == 0) { 7000 error = EINVAL; 7001 goto fail; 7002 } 7003 7004 if (result->m_len < sizeof(struct sadb_msg)) { 7005 result = m_pullup(result, sizeof(struct sadb_msg)); 7006 if (result == NULL) { 7007 error = ENOBUFS; 7008 goto fail; 7009 } 7010 } 7011 7012 result->m_pkthdr.len = 0; 7013 for (m = result; m; m = m->m_next) 7014 result->m_pkthdr.len += m->m_len; 7015 7016 mtod(result, struct sadb_msg *)->sadb_msg_len = 7017 PFKEY_UNIT64(result->m_pkthdr.len); 7018 7019 splx(s); 7020 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 7021 7022 fail: 7023 if (result) 7024 m_freem(result); 7025 splx(s); 7026 return error; 7027} 7028 7029/* 7030 * SADB_FLUSH processing 7031 * receive 7032 * <base> 7033 * from the ikmpd, and free all entries in secastree. 7034 * and send, 7035 * <base> 7036 * to the ikmpd. 7037 * NOTE: to do is only marking SADB_SASTATE_DEAD. 7038 * 7039 * m will always be freed. 7040 */ 7041static int 7042key_flush(so, m, mhp) 7043 struct socket *so; 7044 struct mbuf *m; 7045 const struct sadb_msghdr *mhp; 7046{ 7047 struct sadb_msg *newmsg; 7048 struct secashead *sah, *nextsah; 7049 struct secasvar *sav, *nextsav; 7050 u_int16_t proto; 7051 u_int8_t state; 7052 u_int stateidx; 7053 7054 IPSEC_ASSERT(so != NULL, ("null socket")); 7055 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7056 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7057 7058 /* map satype to proto */ 7059 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7060 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7061 __func__)); 7062 return key_senderror(so, m, EINVAL); 7063 } 7064 7065 /* no SATYPE specified, i.e. flushing all SA. */ 7066 SAHTREE_LOCK(); 7067 for (sah = LIST_FIRST(&V_sahtree); 7068 sah != NULL; 7069 sah = nextsah) { 7070 nextsah = LIST_NEXT(sah, chain); 7071 7072 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7073 && proto != sah->saidx.proto) 7074 continue; 7075 7076 for (stateidx = 0; 7077 stateidx < _ARRAYLEN(saorder_state_alive); 7078 stateidx++) { 7079 state = saorder_state_any[stateidx]; 7080 for (sav = LIST_FIRST(&sah->savtree[state]); 7081 sav != NULL; 7082 sav = nextsav) { 7083 7084 nextsav = LIST_NEXT(sav, chain); 7085 7086 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 7087 KEY_FREESAV(&sav); 7088 } 7089 } 7090 7091 sah->state = SADB_SASTATE_DEAD; 7092 } 7093 SAHTREE_UNLOCK(); 7094 7095 if (m->m_len < sizeof(struct sadb_msg) || 7096 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 7097 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 7098 return key_senderror(so, m, ENOBUFS); 7099 } 7100 7101 if (m->m_next) 7102 m_freem(m->m_next); 7103 m->m_next = NULL; 7104 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 7105 newmsg = mtod(m, struct sadb_msg *); 7106 newmsg->sadb_msg_errno = 0; 7107 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 7108 7109 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7110} 7111 7112/* 7113 * SADB_DUMP processing 7114 * dump all entries including status of DEAD in SAD. 7115 * receive 7116 * <base> 7117 * from the ikmpd, and dump all secasvar leaves 7118 * and send, 7119 * <base> ..... 7120 * to the ikmpd. 7121 * 7122 * m will always be freed. 7123 */ 7124static int 7125key_dump(so, m, mhp) 7126 struct socket *so; 7127 struct mbuf *m; 7128 const struct sadb_msghdr *mhp; 7129{ 7130 struct secashead *sah; 7131 struct secasvar *sav; 7132 u_int16_t proto; 7133 u_int stateidx; 7134 u_int8_t satype; 7135 u_int8_t state; 7136 int cnt; 7137 struct sadb_msg *newmsg; 7138 struct mbuf *n; 7139 7140 IPSEC_ASSERT(so != NULL, ("null socket")); 7141 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7142 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7143 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7144 7145 /* map satype to proto */ 7146 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7147 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7148 __func__)); 7149 return key_senderror(so, m, EINVAL); 7150 } 7151 7152 /* count sav entries to be sent to the userland. */ 7153 cnt = 0; 7154 SAHTREE_LOCK(); 7155 LIST_FOREACH(sah, &V_sahtree, chain) { 7156 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7157 && proto != sah->saidx.proto) 7158 continue; 7159 7160 for (stateidx = 0; 7161 stateidx < _ARRAYLEN(saorder_state_any); 7162 stateidx++) { 7163 state = saorder_state_any[stateidx]; 7164 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7165 cnt++; 7166 } 7167 } 7168 } 7169 7170 if (cnt == 0) { 7171 SAHTREE_UNLOCK(); 7172 return key_senderror(so, m, ENOENT); 7173 } 7174 7175 /* send this to the userland, one at a time. */ 7176 newmsg = NULL; 7177 LIST_FOREACH(sah, &V_sahtree, chain) { 7178 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7179 && proto != sah->saidx.proto) 7180 continue; 7181 7182 /* map proto to satype */ 7183 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7184 SAHTREE_UNLOCK(); 7185 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7186 "SAD.\n", __func__)); 7187 return key_senderror(so, m, EINVAL); 7188 } 7189 7190 for (stateidx = 0; 7191 stateidx < _ARRAYLEN(saorder_state_any); 7192 stateidx++) { 7193 state = saorder_state_any[stateidx]; 7194 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7195 n = key_setdumpsa(sav, SADB_DUMP, satype, 7196 --cnt, mhp->msg->sadb_msg_pid); 7197 if (!n) { 7198 SAHTREE_UNLOCK(); 7199 return key_senderror(so, m, ENOBUFS); 7200 } 7201 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7202 } 7203 } 7204 } 7205 SAHTREE_UNLOCK(); 7206 7207 m_freem(m); 7208 return 0; 7209} 7210 7211/* 7212 * SADB_X_PROMISC processing 7213 * 7214 * m will always be freed. 7215 */ 7216static int 7217key_promisc(so, m, mhp) 7218 struct socket *so; 7219 struct mbuf *m; 7220 const struct sadb_msghdr *mhp; 7221{ 7222 int olen; 7223 7224 IPSEC_ASSERT(so != NULL, ("null socket")); 7225 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7226 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7227 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7228 7229 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7230 7231 if (olen < sizeof(struct sadb_msg)) { 7232#if 1 7233 return key_senderror(so, m, EINVAL); 7234#else 7235 m_freem(m); 7236 return 0; 7237#endif 7238 } else if (olen == sizeof(struct sadb_msg)) { 7239 /* enable/disable promisc mode */ 7240 struct keycb *kp; 7241 7242 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7243 return key_senderror(so, m, EINVAL); 7244 mhp->msg->sadb_msg_errno = 0; 7245 switch (mhp->msg->sadb_msg_satype) { 7246 case 0: 7247 case 1: 7248 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7249 break; 7250 default: 7251 return key_senderror(so, m, EINVAL); 7252 } 7253 7254 /* send the original message back to everyone */ 7255 mhp->msg->sadb_msg_errno = 0; 7256 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7257 } else { 7258 /* send packet as is */ 7259 7260 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7261 7262 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7263 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7264 } 7265} 7266 7267static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 7268 const struct sadb_msghdr *)) = { 7269 NULL, /* SADB_RESERVED */ 7270 key_getspi, /* SADB_GETSPI */ 7271 key_update, /* SADB_UPDATE */ 7272 key_add, /* SADB_ADD */ 7273 key_delete, /* SADB_DELETE */ 7274 key_get, /* SADB_GET */ 7275 key_acquire2, /* SADB_ACQUIRE */ 7276 key_register, /* SADB_REGISTER */ 7277 NULL, /* SADB_EXPIRE */ 7278 key_flush, /* SADB_FLUSH */ 7279 key_dump, /* SADB_DUMP */ 7280 key_promisc, /* SADB_X_PROMISC */ 7281 NULL, /* SADB_X_PCHANGE */ 7282 key_spdadd, /* SADB_X_SPDUPDATE */ 7283 key_spdadd, /* SADB_X_SPDADD */ 7284 key_spddelete, /* SADB_X_SPDDELETE */ 7285 key_spdget, /* SADB_X_SPDGET */ 7286 NULL, /* SADB_X_SPDACQUIRE */ 7287 key_spddump, /* SADB_X_SPDDUMP */ 7288 key_spdflush, /* SADB_X_SPDFLUSH */ 7289 key_spdadd, /* SADB_X_SPDSETIDX */ 7290 NULL, /* SADB_X_SPDEXPIRE */ 7291 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7292}; 7293 7294/* 7295 * parse sadb_msg buffer to process PFKEYv2, 7296 * and create a data to response if needed. 7297 * I think to be dealed with mbuf directly. 7298 * IN: 7299 * msgp : pointer to pointer to a received buffer pulluped. 7300 * This is rewrited to response. 7301 * so : pointer to socket. 7302 * OUT: 7303 * length for buffer to send to user process. 7304 */ 7305int 7306key_parse(m, so) 7307 struct mbuf *m; 7308 struct socket *so; 7309{ 7310 struct sadb_msg *msg; 7311 struct sadb_msghdr mh; 7312 u_int orglen; 7313 int error; 7314 int target; 7315 7316 IPSEC_ASSERT(so != NULL, ("null socket")); 7317 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7318 7319#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7320 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7321 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7322 kdebug_sadb(msg)); 7323#endif 7324 7325 if (m->m_len < sizeof(struct sadb_msg)) { 7326 m = m_pullup(m, sizeof(struct sadb_msg)); 7327 if (!m) 7328 return ENOBUFS; 7329 } 7330 msg = mtod(m, struct sadb_msg *); 7331 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7332 target = KEY_SENDUP_ONE; 7333 7334 if ((m->m_flags & M_PKTHDR) == 0 || 7335 m->m_pkthdr.len != m->m_pkthdr.len) { 7336 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7337 V_pfkeystat.out_invlen++; 7338 error = EINVAL; 7339 goto senderror; 7340 } 7341 7342 if (msg->sadb_msg_version != PF_KEY_V2) { 7343 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7344 __func__, msg->sadb_msg_version)); 7345 V_pfkeystat.out_invver++; 7346 error = EINVAL; 7347 goto senderror; 7348 } 7349 7350 if (msg->sadb_msg_type > SADB_MAX) { 7351 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7352 __func__, msg->sadb_msg_type)); 7353 V_pfkeystat.out_invmsgtype++; 7354 error = EINVAL; 7355 goto senderror; 7356 } 7357 7358 /* for old-fashioned code - should be nuked */ 7359 if (m->m_pkthdr.len > MCLBYTES) { 7360 m_freem(m); 7361 return ENOBUFS; 7362 } 7363 if (m->m_next) { 7364 struct mbuf *n; 7365 7366 MGETHDR(n, M_DONTWAIT, MT_DATA); 7367 if (n && m->m_pkthdr.len > MHLEN) { 7368 MCLGET(n, M_DONTWAIT); 7369 if ((n->m_flags & M_EXT) == 0) { 7370 m_free(n); 7371 n = NULL; 7372 } 7373 } 7374 if (!n) { 7375 m_freem(m); 7376 return ENOBUFS; 7377 } 7378 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7379 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7380 n->m_next = NULL; 7381 m_freem(m); 7382 m = n; 7383 } 7384 7385 /* align the mbuf chain so that extensions are in contiguous region. */ 7386 error = key_align(m, &mh); 7387 if (error) 7388 return error; 7389 7390 msg = mh.msg; 7391 7392 /* check SA type */ 7393 switch (msg->sadb_msg_satype) { 7394 case SADB_SATYPE_UNSPEC: 7395 switch (msg->sadb_msg_type) { 7396 case SADB_GETSPI: 7397 case SADB_UPDATE: 7398 case SADB_ADD: 7399 case SADB_DELETE: 7400 case SADB_GET: 7401 case SADB_ACQUIRE: 7402 case SADB_EXPIRE: 7403 ipseclog((LOG_DEBUG, "%s: must specify satype " 7404 "when msg type=%u.\n", __func__, 7405 msg->sadb_msg_type)); 7406 V_pfkeystat.out_invsatype++; 7407 error = EINVAL; 7408 goto senderror; 7409 } 7410 break; 7411 case SADB_SATYPE_AH: 7412 case SADB_SATYPE_ESP: 7413 case SADB_X_SATYPE_IPCOMP: 7414 case SADB_X_SATYPE_TCPSIGNATURE: 7415 switch (msg->sadb_msg_type) { 7416 case SADB_X_SPDADD: 7417 case SADB_X_SPDDELETE: 7418 case SADB_X_SPDGET: 7419 case SADB_X_SPDDUMP: 7420 case SADB_X_SPDFLUSH: 7421 case SADB_X_SPDSETIDX: 7422 case SADB_X_SPDUPDATE: 7423 case SADB_X_SPDDELETE2: 7424 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7425 __func__, msg->sadb_msg_type)); 7426 V_pfkeystat.out_invsatype++; 7427 error = EINVAL; 7428 goto senderror; 7429 } 7430 break; 7431 case SADB_SATYPE_RSVP: 7432 case SADB_SATYPE_OSPFV2: 7433 case SADB_SATYPE_RIPV2: 7434 case SADB_SATYPE_MIP: 7435 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7436 __func__, msg->sadb_msg_satype)); 7437 V_pfkeystat.out_invsatype++; 7438 error = EOPNOTSUPP; 7439 goto senderror; 7440 case 1: /* XXX: What does it do? */ 7441 if (msg->sadb_msg_type == SADB_X_PROMISC) 7442 break; 7443 /*FALLTHROUGH*/ 7444 default: 7445 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7446 __func__, msg->sadb_msg_satype)); 7447 V_pfkeystat.out_invsatype++; 7448 error = EINVAL; 7449 goto senderror; 7450 } 7451 7452 /* check field of upper layer protocol and address family */ 7453 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7454 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7455 struct sadb_address *src0, *dst0; 7456 u_int plen; 7457 7458 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7459 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7460 7461 /* check upper layer protocol */ 7462 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7463 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7464 "mismatched.\n", __func__)); 7465 V_pfkeystat.out_invaddr++; 7466 error = EINVAL; 7467 goto senderror; 7468 } 7469 7470 /* check family */ 7471 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7472 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7473 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7474 __func__)); 7475 V_pfkeystat.out_invaddr++; 7476 error = EINVAL; 7477 goto senderror; 7478 } 7479 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7480 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7481 ipseclog((LOG_DEBUG, "%s: address struct size " 7482 "mismatched.\n", __func__)); 7483 V_pfkeystat.out_invaddr++; 7484 error = EINVAL; 7485 goto senderror; 7486 } 7487 7488 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7489 case AF_INET: 7490 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7491 sizeof(struct sockaddr_in)) { 7492 V_pfkeystat.out_invaddr++; 7493 error = EINVAL; 7494 goto senderror; 7495 } 7496 break; 7497 case AF_INET6: 7498 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7499 sizeof(struct sockaddr_in6)) { 7500 V_pfkeystat.out_invaddr++; 7501 error = EINVAL; 7502 goto senderror; 7503 } 7504 break; 7505 default: 7506 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7507 __func__)); 7508 V_pfkeystat.out_invaddr++; 7509 error = EAFNOSUPPORT; 7510 goto senderror; 7511 } 7512 7513 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7514 case AF_INET: 7515 plen = sizeof(struct in_addr) << 3; 7516 break; 7517 case AF_INET6: 7518 plen = sizeof(struct in6_addr) << 3; 7519 break; 7520 default: 7521 plen = 0; /*fool gcc*/ 7522 break; 7523 } 7524 7525 /* check max prefix length */ 7526 if (src0->sadb_address_prefixlen > plen || 7527 dst0->sadb_address_prefixlen > plen) { 7528 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7529 __func__)); 7530 V_pfkeystat.out_invaddr++; 7531 error = EINVAL; 7532 goto senderror; 7533 } 7534 7535 /* 7536 * prefixlen == 0 is valid because there can be a case when 7537 * all addresses are matched. 7538 */ 7539 } 7540 7541 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7542 key_typesw[msg->sadb_msg_type] == NULL) { 7543 V_pfkeystat.out_invmsgtype++; 7544 error = EINVAL; 7545 goto senderror; 7546 } 7547 7548 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7549 7550senderror: 7551 msg->sadb_msg_errno = error; 7552 return key_sendup_mbuf(so, m, target); 7553} 7554 7555static int 7556key_senderror(so, m, code) 7557 struct socket *so; 7558 struct mbuf *m; 7559 int code; 7560{ 7561 struct sadb_msg *msg; 7562 7563 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7564 ("mbuf too small, len %u", m->m_len)); 7565 7566 msg = mtod(m, struct sadb_msg *); 7567 msg->sadb_msg_errno = code; 7568 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7569} 7570 7571/* 7572 * set the pointer to each header into message buffer. 7573 * m will be freed on error. 7574 * XXX larger-than-MCLBYTES extension? 7575 */ 7576static int 7577key_align(m, mhp) 7578 struct mbuf *m; 7579 struct sadb_msghdr *mhp; 7580{ 7581 struct mbuf *n; 7582 struct sadb_ext *ext; 7583 size_t off, end; 7584 int extlen; 7585 int toff; 7586 7587 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7588 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7589 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7590 ("mbuf too small, len %u", m->m_len)); 7591 7592 /* initialize */ 7593 bzero(mhp, sizeof(*mhp)); 7594 7595 mhp->msg = mtod(m, struct sadb_msg *); 7596 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7597 7598 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7599 extlen = end; /*just in case extlen is not updated*/ 7600 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7601 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7602 if (!n) { 7603 /* m is already freed */ 7604 return ENOBUFS; 7605 } 7606 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7607 7608 /* set pointer */ 7609 switch (ext->sadb_ext_type) { 7610 case SADB_EXT_SA: 7611 case SADB_EXT_ADDRESS_SRC: 7612 case SADB_EXT_ADDRESS_DST: 7613 case SADB_EXT_ADDRESS_PROXY: 7614 case SADB_EXT_LIFETIME_CURRENT: 7615 case SADB_EXT_LIFETIME_HARD: 7616 case SADB_EXT_LIFETIME_SOFT: 7617 case SADB_EXT_KEY_AUTH: 7618 case SADB_EXT_KEY_ENCRYPT: 7619 case SADB_EXT_IDENTITY_SRC: 7620 case SADB_EXT_IDENTITY_DST: 7621 case SADB_EXT_SENSITIVITY: 7622 case SADB_EXT_PROPOSAL: 7623 case SADB_EXT_SUPPORTED_AUTH: 7624 case SADB_EXT_SUPPORTED_ENCRYPT: 7625 case SADB_EXT_SPIRANGE: 7626 case SADB_X_EXT_POLICY: 7627 case SADB_X_EXT_SA2: 7628#ifdef IPSEC_NAT_T 7629 case SADB_X_EXT_NAT_T_TYPE: 7630 case SADB_X_EXT_NAT_T_SPORT: 7631 case SADB_X_EXT_NAT_T_DPORT: 7632 case SADB_X_EXT_NAT_T_OAI: 7633 case SADB_X_EXT_NAT_T_OAR: 7634 case SADB_X_EXT_NAT_T_FRAG: 7635#endif 7636 /* duplicate check */ 7637 /* 7638 * XXX Are there duplication payloads of either 7639 * KEY_AUTH or KEY_ENCRYPT ? 7640 */ 7641 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7642 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7643 "%u\n", __func__, ext->sadb_ext_type)); 7644 m_freem(m); 7645 V_pfkeystat.out_dupext++; 7646 return EINVAL; 7647 } 7648 break; 7649 default: 7650 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7651 __func__, ext->sadb_ext_type)); 7652 m_freem(m); 7653 V_pfkeystat.out_invexttype++; 7654 return EINVAL; 7655 } 7656 7657 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7658 7659 if (key_validate_ext(ext, extlen)) { 7660 m_freem(m); 7661 V_pfkeystat.out_invlen++; 7662 return EINVAL; 7663 } 7664 7665 n = m_pulldown(m, off, extlen, &toff); 7666 if (!n) { 7667 /* m is already freed */ 7668 return ENOBUFS; 7669 } 7670 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7671 7672 mhp->ext[ext->sadb_ext_type] = ext; 7673 mhp->extoff[ext->sadb_ext_type] = off; 7674 mhp->extlen[ext->sadb_ext_type] = extlen; 7675 } 7676 7677 if (off != end) { 7678 m_freem(m); 7679 V_pfkeystat.out_invlen++; 7680 return EINVAL; 7681 } 7682 7683 return 0; 7684} 7685 7686static int 7687key_validate_ext(ext, len) 7688 const struct sadb_ext *ext; 7689 int len; 7690{ 7691 const struct sockaddr *sa; 7692 enum { NONE, ADDR } checktype = NONE; 7693 int baselen = 0; 7694 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7695 7696 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7697 return EINVAL; 7698 7699 /* if it does not match minimum/maximum length, bail */ 7700 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7701 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7702 return EINVAL; 7703 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7704 return EINVAL; 7705 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7706 return EINVAL; 7707 7708 /* more checks based on sadb_ext_type XXX need more */ 7709 switch (ext->sadb_ext_type) { 7710 case SADB_EXT_ADDRESS_SRC: 7711 case SADB_EXT_ADDRESS_DST: 7712 case SADB_EXT_ADDRESS_PROXY: 7713 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7714 checktype = ADDR; 7715 break; 7716 case SADB_EXT_IDENTITY_SRC: 7717 case SADB_EXT_IDENTITY_DST: 7718 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7719 SADB_X_IDENTTYPE_ADDR) { 7720 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7721 checktype = ADDR; 7722 } else 7723 checktype = NONE; 7724 break; 7725 default: 7726 checktype = NONE; 7727 break; 7728 } 7729 7730 switch (checktype) { 7731 case NONE: 7732 break; 7733 case ADDR: 7734 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7735 if (len < baselen + sal) 7736 return EINVAL; 7737 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7738 return EINVAL; 7739 break; 7740 } 7741 7742 return 0; 7743} 7744 7745void 7746key_init(void) 7747{ 7748 int i; 7749 7750 for (i = 0; i < IPSEC_DIR_MAX; i++) 7751 LIST_INIT(&V_sptree[i]); 7752 7753 LIST_INIT(&V_sahtree); 7754 7755 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7756 LIST_INIT(&V_regtree[i]); 7757 7758 LIST_INIT(&V_acqtree); 7759 LIST_INIT(&V_spacqtree); 7760 7761 /* system default */ 7762 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7763 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7764 7765 if (!IS_DEFAULT_VNET(curvnet)) 7766 return; 7767 7768 SPTREE_LOCK_INIT(); 7769 REGTREE_LOCK_INIT(); 7770 SAHTREE_LOCK_INIT(); 7771 ACQ_LOCK_INIT(); 7772 SPACQ_LOCK_INIT(); 7773 7774#ifndef IPSEC_DEBUG2 7775 timeout((void *)key_timehandler, (void *)0, hz); 7776#endif /*IPSEC_DEBUG2*/ 7777 7778 /* initialize key statistics */ 7779 keystat.getspi_count = 1; 7780 7781 printf("IPsec: Initialized Security Association Processing.\n"); 7782} 7783 7784#ifdef VIMAGE 7785void 7786key_destroy(void) 7787{ 7788 struct secpolicy *sp, *nextsp; 7789 struct secspacq *acq, *nextacq; 7790 struct secashead *sah, *nextsah; 7791 struct secreg *reg; 7792 int i; 7793 7794 SPTREE_LOCK(); 7795 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7796 for (sp = LIST_FIRST(&V_sptree[i]); 7797 sp != NULL; sp = nextsp) { 7798 nextsp = LIST_NEXT(sp, chain); 7799 if (__LIST_CHAINED(sp)) { 7800 LIST_REMOVE(sp, chain); 7801 free(sp, M_IPSEC_SP); 7802 } 7803 } 7804 } 7805 SPTREE_UNLOCK(); 7806 7807 SAHTREE_LOCK(); 7808 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7809 nextsah = LIST_NEXT(sah, chain); 7810 if (__LIST_CHAINED(sah)) { 7811 LIST_REMOVE(sah, chain); 7812 free(sah, M_IPSEC_SAH); 7813 } 7814 } 7815 SAHTREE_UNLOCK(); 7816 7817 REGTREE_LOCK(); 7818 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7819 LIST_FOREACH(reg, &V_regtree[i], chain) { 7820 if (__LIST_CHAINED(reg)) { 7821 LIST_REMOVE(reg, chain); 7822 free(reg, M_IPSEC_SAR); 7823 break; 7824 } 7825 } 7826 } 7827 REGTREE_UNLOCK(); 7828 7829 ACQ_LOCK(); 7830 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7831 nextacq = LIST_NEXT(acq, chain); 7832 if (__LIST_CHAINED(acq)) { 7833 LIST_REMOVE(acq, chain); 7834 free(acq, M_IPSEC_SAQ); 7835 } 7836 } 7837 ACQ_UNLOCK(); 7838 7839 SPACQ_LOCK(); 7840 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 7841 nextacq = LIST_NEXT(acq, chain); 7842 if (__LIST_CHAINED(acq)) { 7843 LIST_REMOVE(acq, chain); 7844 free(acq, M_IPSEC_SAQ); 7845 } 7846 } 7847 SPACQ_UNLOCK(); 7848} 7849#endif 7850 7851/* 7852 * XXX: maybe This function is called after INBOUND IPsec processing. 7853 * 7854 * Special check for tunnel-mode packets. 7855 * We must make some checks for consistency between inner and outer IP header. 7856 * 7857 * xxx more checks to be provided 7858 */ 7859int 7860key_checktunnelsanity(sav, family, src, dst) 7861 struct secasvar *sav; 7862 u_int family; 7863 caddr_t src; 7864 caddr_t dst; 7865{ 7866 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7867 7868 /* XXX: check inner IP header */ 7869 7870 return 1; 7871} 7872 7873/* record data transfer on SA, and update timestamps */ 7874void 7875key_sa_recordxfer(sav, m) 7876 struct secasvar *sav; 7877 struct mbuf *m; 7878{ 7879 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7880 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7881 if (!sav->lft_c) 7882 return; 7883 7884 /* 7885 * XXX Currently, there is a difference of bytes size 7886 * between inbound and outbound processing. 7887 */ 7888 sav->lft_c->bytes += m->m_pkthdr.len; 7889 /* to check bytes lifetime is done in key_timehandler(). */ 7890 7891 /* 7892 * We use the number of packets as the unit of 7893 * allocations. We increment the variable 7894 * whenever {esp,ah}_{in,out}put is called. 7895 */ 7896 sav->lft_c->allocations++; 7897 /* XXX check for expires? */ 7898 7899 /* 7900 * NOTE: We record CURRENT usetime by using wall clock, 7901 * in seconds. HARD and SOFT lifetime are measured by the time 7902 * difference (again in seconds) from usetime. 7903 * 7904 * usetime 7905 * v expire expire 7906 * -----+-----+--------+---> t 7907 * <--------------> HARD 7908 * <-----> SOFT 7909 */ 7910 sav->lft_c->usetime = time_second; 7911 /* XXX check for expires? */ 7912 7913 return; 7914} 7915 7916/* dumb version */ 7917void 7918key_sa_routechange(dst) 7919 struct sockaddr *dst; 7920{ 7921 struct secashead *sah; 7922 struct route *ro; 7923 7924 SAHTREE_LOCK(); 7925 LIST_FOREACH(sah, &V_sahtree, chain) { 7926 ro = &sah->sa_route; 7927 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7928 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7929 RTFREE(ro->ro_rt); 7930 ro->ro_rt = (struct rtentry *)NULL; 7931 } 7932 } 7933 SAHTREE_UNLOCK(); 7934} 7935 7936static void 7937key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7938{ 7939 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7940 SAHTREE_LOCK_ASSERT(); 7941 7942 if (sav->state != state) { 7943 if (__LIST_CHAINED(sav)) 7944 LIST_REMOVE(sav, chain); 7945 sav->state = state; 7946 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7947 } 7948} 7949 7950void 7951key_sa_stir_iv(sav) 7952 struct secasvar *sav; 7953{ 7954 7955 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7956 key_randomfill(sav->iv, sav->ivlen); 7957} 7958 7959/* XXX too much? */ 7960static struct mbuf * 7961key_alloc_mbuf(l) 7962 int l; 7963{ 7964 struct mbuf *m = NULL, *n; 7965 int len, t; 7966 7967 len = l; 7968 while (len > 0) { 7969 MGET(n, M_DONTWAIT, MT_DATA); 7970 if (n && len > MLEN) 7971 MCLGET(n, M_DONTWAIT); 7972 if (!n) { 7973 m_freem(m); 7974 return NULL; 7975 } 7976 7977 n->m_next = NULL; 7978 n->m_len = 0; 7979 n->m_len = M_TRAILINGSPACE(n); 7980 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7981 if (n->m_len > len) { 7982 t = (n->m_len - len) & ~(sizeof(long) - 1); 7983 n->m_data += t; 7984 n->m_len = len; 7985 } 7986 7987 len -= n->m_len; 7988 7989 if (m) 7990 m_cat(m, n); 7991 else 7992 m = n; 7993 } 7994 7995 return m; 7996} 7997 7998/* 7999 * Take one of the kernel's security keys and convert it into a PF_KEY 8000 * structure within an mbuf, suitable for sending up to a waiting 8001 * application in user land. 8002 * 8003 * IN: 8004 * src: A pointer to a kernel security key. 8005 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 8006 * OUT: 8007 * a valid mbuf or NULL indicating an error 8008 * 8009 */ 8010 8011static struct mbuf * 8012key_setkey(struct seckey *src, u_int16_t exttype) 8013{ 8014 struct mbuf *m; 8015 struct sadb_key *p; 8016 int len; 8017 8018 if (src == NULL) 8019 return NULL; 8020 8021 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 8022 m = key_alloc_mbuf(len); 8023 if (m == NULL) 8024 return NULL; 8025 p = mtod(m, struct sadb_key *); 8026 bzero(p, len); 8027 p->sadb_key_len = PFKEY_UNIT64(len); 8028 p->sadb_key_exttype = exttype; 8029 p->sadb_key_bits = src->bits; 8030 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 8031 8032 return m; 8033} 8034 8035/* 8036 * Take one of the kernel's lifetime data structures and convert it 8037 * into a PF_KEY structure within an mbuf, suitable for sending up to 8038 * a waiting application in user land. 8039 * 8040 * IN: 8041 * src: A pointer to a kernel lifetime structure. 8042 * exttype: Which type of lifetime this is. Refer to the PF_KEY 8043 * data structures for more information. 8044 * OUT: 8045 * a valid mbuf or NULL indicating an error 8046 * 8047 */ 8048 8049static struct mbuf * 8050key_setlifetime(struct seclifetime *src, u_int16_t exttype) 8051{ 8052 struct mbuf *m = NULL; 8053 struct sadb_lifetime *p; 8054 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 8055 8056 if (src == NULL) 8057 return NULL; 8058 8059 m = key_alloc_mbuf(len); 8060 if (m == NULL) 8061 return m; 8062 p = mtod(m, struct sadb_lifetime *); 8063 8064 bzero(p, len); 8065 p->sadb_lifetime_len = PFKEY_UNIT64(len); 8066 p->sadb_lifetime_exttype = exttype; 8067 p->sadb_lifetime_allocations = src->allocations; 8068 p->sadb_lifetime_bytes = src->bytes; 8069 p->sadb_lifetime_addtime = src->addtime; 8070 p->sadb_lifetime_usetime = src->usetime; 8071 8072 return m; 8073 8074} 8075