key.c revision 283902
1/* $FreeBSD: stable/10/sys/netipsec/key.c 283902 2015-06-02 03:43:36Z ae $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59 60#include <net/if.h> 61#include <net/raw_cb.h> 62#include <net/vnet.h> 63 64#include <netinet/in.h> 65#include <netinet/in_systm.h> 66#include <netinet/ip.h> 67#include <netinet/in_var.h> 68 69#ifdef INET6 70#include <netinet/ip6.h> 71#include <netinet6/in6_var.h> 72#include <netinet6/ip6_var.h> 73#endif /* INET6 */ 74 75#if defined(INET) || defined(INET6) 76#include <netinet/in_pcb.h> 77#endif 78#ifdef INET6 79#include <netinet6/in6_pcb.h> 80#endif /* INET6 */ 81 82#include <net/pfkeyv2.h> 83#include <netipsec/keydb.h> 84#include <netipsec/key.h> 85#include <netipsec/keysock.h> 86#include <netipsec/key_debug.h> 87 88#include <netipsec/ipsec.h> 89#ifdef INET6 90#include <netipsec/ipsec6.h> 91#endif 92 93#include <netipsec/xform.h> 94 95#include <machine/stdarg.h> 96 97/* randomness */ 98#include <sys/random.h> 99 100#define FULLMASK 0xff 101#define _BITS(bytes) ((bytes) << 3) 102 103/* 104 * Note on SA reference counting: 105 * - SAs that are not in DEAD state will have (total external reference + 1) 106 * following value in reference count field. they cannot be freed and are 107 * referenced from SA header. 108 * - SAs that are in DEAD state will have (total external reference) 109 * in reference count field. they are ready to be freed. reference from 110 * SA header will be removed in key_delsav(), when the reference count 111 * field hits 0 (= no external reference other than from SA header. 112 */ 113 114VNET_DEFINE(u_int32_t, key_debug_level) = 0; 115static VNET_DEFINE(u_int, key_spi_trycnt) = 1000; 116static VNET_DEFINE(u_int32_t, key_spi_minval) = 0x100; 117static VNET_DEFINE(u_int32_t, key_spi_maxval) = 0x0fffffff; /* XXX */ 118static VNET_DEFINE(u_int32_t, policy_id) = 0; 119/*interval to initialize randseed,1(m)*/ 120static VNET_DEFINE(u_int, key_int_random) = 60; 121/* interval to expire acquiring, 30(s)*/ 122static VNET_DEFINE(u_int, key_larval_lifetime) = 30; 123/* counter for blocking SADB_ACQUIRE.*/ 124static VNET_DEFINE(int, key_blockacq_count) = 10; 125/* lifetime for blocking SADB_ACQUIRE.*/ 126static VNET_DEFINE(int, key_blockacq_lifetime) = 20; 127/* preferred old sa rather than new sa.*/ 128static VNET_DEFINE(int, key_preferred_oldsa) = 1; 129#define V_key_spi_trycnt VNET(key_spi_trycnt) 130#define V_key_spi_minval VNET(key_spi_minval) 131#define V_key_spi_maxval VNET(key_spi_maxval) 132#define V_policy_id VNET(policy_id) 133#define V_key_int_random VNET(key_int_random) 134#define V_key_larval_lifetime VNET(key_larval_lifetime) 135#define V_key_blockacq_count VNET(key_blockacq_count) 136#define V_key_blockacq_lifetime VNET(key_blockacq_lifetime) 137#define V_key_preferred_oldsa VNET(key_preferred_oldsa) 138 139static VNET_DEFINE(u_int32_t, acq_seq) = 0; 140#define V_acq_seq VNET(acq_seq) 141 142 /* SPD */ 143static VNET_DEFINE(LIST_HEAD(_sptree, secpolicy), sptree[IPSEC_DIR_MAX]); 144#define V_sptree VNET(sptree) 145static struct mtx sptree_lock; 146#define SPTREE_LOCK_INIT() \ 147 mtx_init(&sptree_lock, "sptree", \ 148 "fast ipsec security policy database", MTX_DEF) 149#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 150#define SPTREE_LOCK() mtx_lock(&sptree_lock) 151#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 152#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 153 154static VNET_DEFINE(LIST_HEAD(_sahtree, secashead), sahtree); /* SAD */ 155#define V_sahtree VNET(sahtree) 156static struct mtx sahtree_lock; 157#define SAHTREE_LOCK_INIT() \ 158 mtx_init(&sahtree_lock, "sahtree", \ 159 "fast ipsec security association database", MTX_DEF) 160#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 161#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 162#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 163#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 164 165 /* registed list */ 166static VNET_DEFINE(LIST_HEAD(_regtree, secreg), regtree[SADB_SATYPE_MAX + 1]); 167#define V_regtree VNET(regtree) 168static struct mtx regtree_lock; 169#define REGTREE_LOCK_INIT() \ 170 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 171#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 172#define REGTREE_LOCK() mtx_lock(®tree_lock) 173#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 174#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 175 176static VNET_DEFINE(LIST_HEAD(_acqtree, secacq), acqtree); /* acquiring list */ 177#define V_acqtree VNET(acqtree) 178static struct mtx acq_lock; 179#define ACQ_LOCK_INIT() \ 180 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 181#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 182#define ACQ_LOCK() mtx_lock(&acq_lock) 183#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 184#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 185 186 /* SP acquiring list */ 187static VNET_DEFINE(LIST_HEAD(_spacqtree, secspacq), spacqtree); 188#define V_spacqtree VNET(spacqtree) 189static struct mtx spacq_lock; 190#define SPACQ_LOCK_INIT() \ 191 mtx_init(&spacq_lock, "spacqtree", \ 192 "fast ipsec security policy acquire list", MTX_DEF) 193#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 194#define SPACQ_LOCK() mtx_lock(&spacq_lock) 195#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 196#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 197 198/* search order for SAs */ 199static const u_int saorder_state_valid_prefer_old[] = { 200 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 201}; 202static const u_int saorder_state_valid_prefer_new[] = { 203 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 204}; 205static const u_int saorder_state_alive[] = { 206 /* except DEAD */ 207 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 208}; 209static const u_int saorder_state_any[] = { 210 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 211 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 212}; 213 214static const int minsize[] = { 215 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 216 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 217 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 220 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 221 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 222 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 223 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 224 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 225 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 226 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 227 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 228 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 229 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 230 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 231 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 232 0, /* SADB_X_EXT_KMPRIVATE */ 233 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 234 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 235 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 236 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 237 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 238 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 239 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 240 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 241}; 242static const int maxsize[] = { 243 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 244 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 245 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 246 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 247 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 248 0, /* SADB_EXT_ADDRESS_SRC */ 249 0, /* SADB_EXT_ADDRESS_DST */ 250 0, /* SADB_EXT_ADDRESS_PROXY */ 251 0, /* SADB_EXT_KEY_AUTH */ 252 0, /* SADB_EXT_KEY_ENCRYPT */ 253 0, /* SADB_EXT_IDENTITY_SRC */ 254 0, /* SADB_EXT_IDENTITY_DST */ 255 0, /* SADB_EXT_SENSITIVITY */ 256 0, /* SADB_EXT_PROPOSAL */ 257 0, /* SADB_EXT_SUPPORTED_AUTH */ 258 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 259 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 260 0, /* SADB_X_EXT_KMPRIVATE */ 261 0, /* SADB_X_EXT_POLICY */ 262 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 263 sizeof(struct sadb_x_nat_t_type),/* SADB_X_EXT_NAT_T_TYPE */ 264 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_SPORT */ 265 sizeof(struct sadb_x_nat_t_port),/* SADB_X_EXT_NAT_T_DPORT */ 266 0, /* SADB_X_EXT_NAT_T_OAI */ 267 0, /* SADB_X_EXT_NAT_T_OAR */ 268 sizeof(struct sadb_x_nat_t_frag),/* SADB_X_EXT_NAT_T_FRAG */ 269}; 270 271static VNET_DEFINE(int, ipsec_esp_keymin) = 256; 272static VNET_DEFINE(int, ipsec_esp_auth) = 0; 273static VNET_DEFINE(int, ipsec_ah_keymin) = 128; 274 275#define V_ipsec_esp_keymin VNET(ipsec_esp_keymin) 276#define V_ipsec_esp_auth VNET(ipsec_esp_auth) 277#define V_ipsec_ah_keymin VNET(ipsec_ah_keymin) 278 279#ifdef SYSCTL_DECL 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(const struct secasindex *); 412static void key_freesp_so(struct secpolicy **); 413static struct secasvar *key_do_allocsa_policy(struct secashead *, u_int); 414static void key_delsp(struct secpolicy *); 415static struct secpolicy *key_getsp(struct secpolicyindex *); 416static void _key_delsp(struct secpolicy *sp); 417static struct secpolicy *key_getspbyid(u_int32_t); 418static u_int32_t key_newreqid(void); 419static struct mbuf *key_gather_mbuf(struct mbuf *, 420 const struct sadb_msghdr *, int, int, ...); 421static int key_spdadd(struct socket *, struct mbuf *, 422 const struct sadb_msghdr *); 423static u_int32_t key_getnewspid(void); 424static int key_spddelete(struct socket *, struct mbuf *, 425 const struct sadb_msghdr *); 426static int key_spddelete2(struct socket *, struct mbuf *, 427 const struct sadb_msghdr *); 428static int key_spdget(struct socket *, struct mbuf *, 429 const struct sadb_msghdr *); 430static int key_spdflush(struct socket *, struct mbuf *, 431 const struct sadb_msghdr *); 432static int key_spddump(struct socket *, struct mbuf *, 433 const struct sadb_msghdr *); 434static struct mbuf *key_setdumpsp(struct secpolicy *, 435 u_int8_t, u_int32_t, u_int32_t); 436static u_int key_getspreqmsglen(struct secpolicy *); 437static int key_spdexpire(struct secpolicy *); 438static struct secashead *key_newsah(struct secasindex *); 439static void key_delsah(struct secashead *); 440static struct secasvar *key_newsav(struct mbuf *, 441 const struct sadb_msghdr *, struct secashead *, int *, 442 const char*, int); 443#define KEY_NEWSAV(m, sadb, sah, e) \ 444 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 445static void key_delsav(struct secasvar *); 446static struct secashead *key_getsah(struct secasindex *); 447static struct secasvar *key_checkspidup(struct secasindex *, u_int32_t); 448static struct secasvar *key_getsavbyspi(struct secashead *, u_int32_t); 449static int key_setsaval(struct secasvar *, struct mbuf *, 450 const struct sadb_msghdr *); 451static int key_mature(struct secasvar *); 452static struct mbuf *key_setdumpsa(struct secasvar *, u_int8_t, 453 u_int8_t, u_int32_t, u_int32_t); 454static struct mbuf *key_setsadbmsg(u_int8_t, u_int16_t, u_int8_t, 455 u_int32_t, pid_t, u_int16_t); 456static struct mbuf *key_setsadbsa(struct secasvar *); 457static struct mbuf *key_setsadbaddr(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(u_int8_t, u_int32_t, u_int32_t); 467static struct mbuf *key_setsadbxpolicy(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(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(const struct secasindex *, 483 const struct secasindex *, int); 484static int key_cmpspidx_exactly(struct secpolicyindex *, 485 struct secpolicyindex *); 486static int key_cmpspidx_withmask(struct secpolicyindex *, 487 struct secpolicyindex *); 488static int key_sockaddrcmp(const struct sockaddr *, 489 const struct sockaddr *, int); 490static int key_bbcmp(const void *, const void *, u_int); 491static u_int16_t key_satype2proto(u_int8_t); 492static u_int8_t key_proto2satype(u_int16_t); 493 494static int key_getspi(struct socket *, struct mbuf *, 495 const struct sadb_msghdr *); 496static u_int32_t key_do_getnewspi(struct sadb_spirange *, 497 struct secasindex *); 498static int key_update(struct socket *, struct mbuf *, 499 const struct sadb_msghdr *); 500#ifdef IPSEC_DOSEQCHECK 501static struct secasvar *key_getsavbyseq(struct secashead *, u_int32_t); 502#endif 503static int key_add(struct socket *, struct mbuf *, 504 const struct sadb_msghdr *); 505static int key_setident(struct secashead *, struct mbuf *, 506 const struct sadb_msghdr *); 507static struct mbuf *key_getmsgbuf_x1(struct mbuf *, 508 const struct sadb_msghdr *); 509static int key_delete(struct socket *, struct mbuf *, 510 const struct sadb_msghdr *); 511static int key_delete_all(struct socket *, struct mbuf *, 512 const struct sadb_msghdr *, u_int16_t); 513static int key_get(struct socket *, struct mbuf *, 514 const struct sadb_msghdr *); 515 516static void key_getcomb_setlifetime(struct sadb_comb *); 517static struct mbuf *key_getcomb_esp(void); 518static struct mbuf *key_getcomb_ah(void); 519static struct mbuf *key_getcomb_ipcomp(void); 520static struct mbuf *key_getprop(const struct secasindex *); 521 522static int key_acquire(const struct secasindex *, struct secpolicy *); 523static struct secacq *key_newacq(const struct secasindex *); 524static struct secacq *key_getacq(const struct secasindex *); 525static struct secacq *key_getacqbyseq(u_int32_t); 526static struct secspacq *key_newspacq(struct secpolicyindex *); 527static struct secspacq *key_getspacq(struct secpolicyindex *); 528static int key_acquire2(struct socket *, struct mbuf *, 529 const struct sadb_msghdr *); 530static int key_register(struct socket *, struct mbuf *, 531 const struct sadb_msghdr *); 532static int key_expire(struct secasvar *); 533static int key_flush(struct socket *, struct mbuf *, 534 const struct sadb_msghdr *); 535static int key_dump(struct socket *, struct mbuf *, 536 const struct sadb_msghdr *); 537static int key_promisc(struct socket *, struct mbuf *, 538 const struct sadb_msghdr *); 539static int key_senderror(struct socket *, struct mbuf *, int); 540static int key_validate_ext(const struct sadb_ext *, int); 541static int key_align(struct mbuf *, struct sadb_msghdr *); 542static struct mbuf *key_setlifetime(struct seclifetime *src, 543 u_int16_t exttype); 544static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 545 546#if 0 547static const char *key_getfqdn(void); 548static const char *key_getuserfqdn(void); 549#endif 550static void key_sa_chgstate(struct secasvar *, u_int8_t); 551 552static __inline void 553sa_initref(struct secasvar *sav) 554{ 555 556 refcount_init(&sav->refcnt, 1); 557} 558static __inline void 559sa_addref(struct secasvar *sav) 560{ 561 562 refcount_acquire(&sav->refcnt); 563 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 564} 565static __inline int 566sa_delref(struct secasvar *sav) 567{ 568 569 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 570 return (refcount_release(&sav->refcnt)); 571} 572 573#define SP_ADDREF(p) do { \ 574 (p)->refcnt++; \ 575 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 576} while (0) 577#define SP_DELREF(p) do { \ 578 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 579 (p)->refcnt--; \ 580} while (0) 581 582 583/* 584 * Update the refcnt while holding the SPTREE lock. 585 */ 586void 587key_addref(struct secpolicy *sp) 588{ 589 SPTREE_LOCK(); 590 SP_ADDREF(sp); 591 SPTREE_UNLOCK(); 592} 593 594/* 595 * Return 0 when there are known to be no SP's for the specified 596 * direction. Otherwise return 1. This is used by IPsec code 597 * to optimize performance. 598 */ 599int 600key_havesp(u_int dir) 601{ 602 603 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 604 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 605} 606 607/* %%% IPsec policy management */ 608/* 609 * allocating a SP for OUTBOUND or INBOUND packet. 610 * Must call key_freesp() later. 611 * OUT: NULL: not found 612 * others: found and return the pointer. 613 */ 614struct secpolicy * 615key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, 616 int tag) 617{ 618 struct secpolicy *sp; 619 620 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 621 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 622 ("invalid direction %u", dir)); 623 624 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 625 printf("DP %s from %s:%u\n", __func__, where, tag)); 626 627 /* get a SP entry */ 628 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 629 printf("*** objects\n"); 630 kdebug_secpolicyindex(spidx)); 631 632 SPTREE_LOCK(); 633 LIST_FOREACH(sp, &V_sptree[dir], chain) { 634 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 635 printf("*** in SPD\n"); 636 kdebug_secpolicyindex(&sp->spidx)); 637 638 if (sp->state == IPSEC_SPSTATE_DEAD) 639 continue; 640 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 641 goto found; 642 } 643 sp = NULL; 644found: 645 if (sp) { 646 /* sanity check */ 647 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 648 649 /* found a SPD entry */ 650 sp->lastused = time_second; 651 SP_ADDREF(sp); 652 } 653 SPTREE_UNLOCK(); 654 655 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 656 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 657 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 658 return sp; 659} 660 661/* 662 * allocating a SP for OUTBOUND or INBOUND packet. 663 * Must call key_freesp() later. 664 * OUT: NULL: not found 665 * others: found and return the pointer. 666 */ 667struct secpolicy * 668key_allocsp2(u_int32_t spi, union sockaddr_union *dst, u_int8_t proto, 669 u_int dir, const char* where, int tag) 670{ 671 struct secpolicy *sp; 672 673 IPSEC_ASSERT(dst != NULL, ("null dst")); 674 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 675 ("invalid direction %u", dir)); 676 677 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 678 printf("DP %s from %s:%u\n", __func__, where, tag)); 679 680 /* get a SP entry */ 681 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 682 printf("*** objects\n"); 683 printf("spi %u proto %u dir %u\n", spi, proto, dir); 684 kdebug_sockaddr(&dst->sa)); 685 686 SPTREE_LOCK(); 687 LIST_FOREACH(sp, &V_sptree[dir], chain) { 688 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 689 printf("*** in SPD\n"); 690 kdebug_secpolicyindex(&sp->spidx)); 691 692 if (sp->state == IPSEC_SPSTATE_DEAD) 693 continue; 694 /* compare simple values, then dst address */ 695 if (sp->spidx.ul_proto != proto) 696 continue; 697 /* NB: spi's must exist and match */ 698 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 699 continue; 700 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 701 goto found; 702 } 703 sp = NULL; 704found: 705 if (sp) { 706 /* sanity check */ 707 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 708 709 /* found a SPD entry */ 710 sp->lastused = time_second; 711 SP_ADDREF(sp); 712 } 713 SPTREE_UNLOCK(); 714 715 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 716 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 717 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 718 return sp; 719} 720 721#if 0 722/* 723 * return a policy that matches this particular inbound packet. 724 * XXX slow 725 */ 726struct secpolicy * 727key_gettunnel(const struct sockaddr *osrc, 728 const struct sockaddr *odst, 729 const struct sockaddr *isrc, 730 const struct sockaddr *idst, 731 const char* where, int tag) 732{ 733 struct secpolicy *sp; 734 const int dir = IPSEC_DIR_INBOUND; 735 struct ipsecrequest *r1, *r2, *p; 736 struct secpolicyindex spidx; 737 738 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 739 printf("DP %s from %s:%u\n", __func__, where, tag)); 740 741 if (isrc->sa_family != idst->sa_family) { 742 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 743 __func__, isrc->sa_family, idst->sa_family)); 744 sp = NULL; 745 goto done; 746 } 747 748 SPTREE_LOCK(); 749 LIST_FOREACH(sp, &V_sptree[dir], chain) { 750 if (sp->state == IPSEC_SPSTATE_DEAD) 751 continue; 752 753 r1 = r2 = NULL; 754 for (p = sp->req; p; p = p->next) { 755 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 756 continue; 757 758 r1 = r2; 759 r2 = p; 760 761 if (!r1) { 762 /* here we look at address matches only */ 763 spidx = sp->spidx; 764 if (isrc->sa_len > sizeof(spidx.src) || 765 idst->sa_len > sizeof(spidx.dst)) 766 continue; 767 bcopy(isrc, &spidx.src, isrc->sa_len); 768 bcopy(idst, &spidx.dst, idst->sa_len); 769 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 770 continue; 771 } else { 772 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 773 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 774 continue; 775 } 776 777 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 778 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 779 continue; 780 781 goto found; 782 } 783 } 784 sp = NULL; 785found: 786 if (sp) { 787 sp->lastused = time_second; 788 SP_ADDREF(sp); 789 } 790 SPTREE_UNLOCK(); 791done: 792 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 793 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 794 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 795 return sp; 796} 797#endif 798 799/* 800 * allocating an SA entry for an *OUTBOUND* packet. 801 * checking each request entries in SP, and acquire an SA if need. 802 * OUT: 0: there are valid requests. 803 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 804 */ 805int 806key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 807{ 808 u_int level; 809 int error; 810 struct secasvar *sav; 811 812 IPSEC_ASSERT(isr != NULL, ("null isr")); 813 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 814 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 815 saidx->mode == IPSEC_MODE_TUNNEL, 816 ("unexpected policy %u", saidx->mode)); 817 818 /* 819 * XXX guard against protocol callbacks from the crypto 820 * thread as they reference ipsecrequest.sav which we 821 * temporarily null out below. Need to rethink how we 822 * handle bundled SA's in the callback thread. 823 */ 824 IPSECREQUEST_LOCK_ASSERT(isr); 825 826 /* get current level */ 827 level = ipsec_get_reqlevel(isr); 828 829 /* 830 * We check new SA in the IPsec request because a different 831 * SA may be involved each time this request is checked, either 832 * because new SAs are being configured, or this request is 833 * associated with an unconnected datagram socket, or this request 834 * is associated with a system default policy. 835 * 836 * key_allocsa_policy should allocate the oldest SA available. 837 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 838 */ 839 sav = key_allocsa_policy(saidx); 840 if (sav != isr->sav) { 841 /* SA need to be updated. */ 842 if (!IPSECREQUEST_UPGRADE(isr)) { 843 /* Kick everyone off. */ 844 IPSECREQUEST_UNLOCK(isr); 845 IPSECREQUEST_WLOCK(isr); 846 } 847 if (isr->sav != NULL) 848 KEY_FREESAV(&isr->sav); 849 isr->sav = sav; 850 IPSECREQUEST_DOWNGRADE(isr); 851 } else if (sav != NULL) 852 KEY_FREESAV(&sav); 853 854 /* When there is SA. */ 855 if (isr->sav != NULL) { 856 if (isr->sav->state != SADB_SASTATE_MATURE && 857 isr->sav->state != SADB_SASTATE_DYING) 858 return EINVAL; 859 return 0; 860 } 861 862 /* there is no SA */ 863 error = key_acquire(saidx, isr->sp); 864 if (error != 0) { 865 /* XXX What should I do ? */ 866 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 867 __func__, error)); 868 return error; 869 } 870 871 if (level != IPSEC_LEVEL_REQUIRE) { 872 /* XXX sigh, the interface to this routine is botched */ 873 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 874 return 0; 875 } else { 876 return ENOENT; 877 } 878} 879 880/* 881 * allocating a SA for policy entry from SAD. 882 * NOTE: searching SAD of aliving state. 883 * OUT: NULL: not found. 884 * others: found and return the pointer. 885 */ 886static struct secasvar * 887key_allocsa_policy(const struct secasindex *saidx) 888{ 889#define N(a) _ARRAYLEN(a) 890 struct secashead *sah; 891 struct secasvar *sav; 892 u_int stateidx, arraysize; 893 const u_int *state_valid; 894 895 state_valid = NULL; /* silence gcc */ 896 arraysize = 0; /* silence gcc */ 897 898 SAHTREE_LOCK(); 899 LIST_FOREACH(sah, &V_sahtree, chain) { 900 if (sah->state == SADB_SASTATE_DEAD) 901 continue; 902 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 903 if (V_key_preferred_oldsa) { 904 state_valid = saorder_state_valid_prefer_old; 905 arraysize = N(saorder_state_valid_prefer_old); 906 } else { 907 state_valid = saorder_state_valid_prefer_new; 908 arraysize = N(saorder_state_valid_prefer_new); 909 } 910 break; 911 } 912 } 913 SAHTREE_UNLOCK(); 914 if (sah == NULL) 915 return NULL; 916 917 /* search valid state */ 918 for (stateidx = 0; stateidx < arraysize; stateidx++) { 919 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 920 if (sav != NULL) 921 return sav; 922 } 923 924 return NULL; 925#undef N 926} 927 928/* 929 * searching SAD with direction, protocol, mode and state. 930 * called by key_allocsa_policy(). 931 * OUT: 932 * NULL : not found 933 * others : found, pointer to a SA. 934 */ 935static struct secasvar * 936key_do_allocsa_policy(struct secashead *sah, u_int state) 937{ 938 struct secasvar *sav, *nextsav, *candidate, *d; 939 940 /* initilize */ 941 candidate = NULL; 942 943 SAHTREE_LOCK(); 944 for (sav = LIST_FIRST(&sah->savtree[state]); 945 sav != NULL; 946 sav = nextsav) { 947 948 nextsav = LIST_NEXT(sav, chain); 949 950 /* sanity check */ 951 KEY_CHKSASTATE(sav->state, state, __func__); 952 953 /* initialize */ 954 if (candidate == NULL) { 955 candidate = sav; 956 continue; 957 } 958 959 /* Which SA is the better ? */ 960 961 IPSEC_ASSERT(candidate->lft_c != NULL, 962 ("null candidate lifetime")); 963 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 964 965 /* What the best method is to compare ? */ 966 if (V_key_preferred_oldsa) { 967 if (candidate->lft_c->addtime > 968 sav->lft_c->addtime) { 969 candidate = sav; 970 } 971 continue; 972 /*NOTREACHED*/ 973 } 974 975 /* preferred new sa rather than old sa */ 976 if (candidate->lft_c->addtime < 977 sav->lft_c->addtime) { 978 d = candidate; 979 candidate = sav; 980 } else 981 d = sav; 982 983 /* 984 * prepared to delete the SA when there is more 985 * suitable candidate and the lifetime of the SA is not 986 * permanent. 987 */ 988 if (d->lft_h->addtime != 0) { 989 struct mbuf *m, *result; 990 u_int8_t satype; 991 992 key_sa_chgstate(d, SADB_SASTATE_DEAD); 993 994 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 995 996 satype = key_proto2satype(d->sah->saidx.proto); 997 if (satype == 0) 998 goto msgfail; 999 1000 m = key_setsadbmsg(SADB_DELETE, 0, 1001 satype, 0, 0, d->refcnt - 1); 1002 if (!m) 1003 goto msgfail; 1004 result = m; 1005 1006 /* set sadb_address for saidx's. */ 1007 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 1008 &d->sah->saidx.src.sa, 1009 d->sah->saidx.src.sa.sa_len << 3, 1010 IPSEC_ULPROTO_ANY); 1011 if (!m) 1012 goto msgfail; 1013 m_cat(result, m); 1014 1015 /* set sadb_address for saidx's. */ 1016 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 1017 &d->sah->saidx.dst.sa, 1018 d->sah->saidx.dst.sa.sa_len << 3, 1019 IPSEC_ULPROTO_ANY); 1020 if (!m) 1021 goto msgfail; 1022 m_cat(result, m); 1023 1024 /* create SA extension */ 1025 m = key_setsadbsa(d); 1026 if (!m) 1027 goto msgfail; 1028 m_cat(result, m); 1029 1030 if (result->m_len < sizeof(struct sadb_msg)) { 1031 result = m_pullup(result, 1032 sizeof(struct sadb_msg)); 1033 if (result == NULL) 1034 goto msgfail; 1035 } 1036 1037 result->m_pkthdr.len = 0; 1038 for (m = result; m; m = m->m_next) 1039 result->m_pkthdr.len += m->m_len; 1040 mtod(result, struct sadb_msg *)->sadb_msg_len = 1041 PFKEY_UNIT64(result->m_pkthdr.len); 1042 1043 if (key_sendup_mbuf(NULL, result, 1044 KEY_SENDUP_REGISTERED)) 1045 goto msgfail; 1046 msgfail: 1047 KEY_FREESAV(&d); 1048 } 1049 } 1050 if (candidate) { 1051 sa_addref(candidate); 1052 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1053 printf("DP %s cause refcnt++:%d SA:%p\n", 1054 __func__, candidate->refcnt, candidate)); 1055 } 1056 SAHTREE_UNLOCK(); 1057 1058 return candidate; 1059} 1060 1061/* 1062 * allocating a usable SA entry for a *INBOUND* packet. 1063 * Must call key_freesav() later. 1064 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1065 * NULL: not found, or error occured. 1066 * 1067 * In the comparison, no source address is used--for RFC2401 conformance. 1068 * To quote, from section 4.1: 1069 * A security association is uniquely identified by a triple consisting 1070 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1071 * security protocol (AH or ESP) identifier. 1072 * Note that, however, we do need to keep source address in IPsec SA. 1073 * IKE specification and PF_KEY specification do assume that we 1074 * keep source address in IPsec SA. We see a tricky situation here. 1075 */ 1076struct secasvar * 1077key_allocsa(union sockaddr_union *dst, u_int proto, u_int32_t spi, 1078 const char* where, int tag) 1079{ 1080 struct secashead *sah; 1081 struct secasvar *sav; 1082 u_int stateidx, arraysize, state; 1083 const u_int *saorder_state_valid; 1084#ifdef IPSEC_NAT_T 1085 int natt_chkport; 1086#endif 1087 1088 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1089 1090 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1091 printf("DP %s from %s:%u\n", __func__, where, tag)); 1092 1093#ifdef IPSEC_NAT_T 1094 natt_chkport = (dst->sa.sa_family == AF_INET && 1095 dst->sa.sa_len == sizeof(struct sockaddr_in) && 1096 dst->sin.sin_port != 0); 1097#endif 1098 1099 /* 1100 * searching SAD. 1101 * XXX: to be checked internal IP header somewhere. Also when 1102 * IPsec tunnel packet is received. But ESP tunnel mode is 1103 * encrypted so we can't check internal IP header. 1104 */ 1105 SAHTREE_LOCK(); 1106 if (V_key_preferred_oldsa) { 1107 saorder_state_valid = saorder_state_valid_prefer_old; 1108 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1109 } else { 1110 saorder_state_valid = saorder_state_valid_prefer_new; 1111 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1112 } 1113 LIST_FOREACH(sah, &V_sahtree, chain) { 1114 int checkport; 1115 1116 /* search valid state */ 1117 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1118 state = saorder_state_valid[stateidx]; 1119 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1120 /* sanity check */ 1121 KEY_CHKSASTATE(sav->state, state, __func__); 1122 /* do not return entries w/ unusable state */ 1123 if (sav->state != SADB_SASTATE_MATURE && 1124 sav->state != SADB_SASTATE_DYING) 1125 continue; 1126 if (proto != sav->sah->saidx.proto) 1127 continue; 1128 if (spi != sav->spi) 1129 continue; 1130 checkport = 0; 1131#ifdef IPSEC_NAT_T 1132 /* 1133 * Really only check ports when this is a NAT-T 1134 * SA. Otherwise other lookups providing ports 1135 * might suffer. 1136 */ 1137 if (sav->natt_type && natt_chkport) 1138 checkport = 1; 1139#endif 1140#if 0 /* don't check src */ 1141 /* check src address */ 1142 if (key_sockaddrcmp(&src->sa, 1143 &sav->sah->saidx.src.sa, checkport) != 0) 1144 continue; 1145#endif 1146 /* check dst address */ 1147 if (key_sockaddrcmp(&dst->sa, 1148 &sav->sah->saidx.dst.sa, checkport) != 0) 1149 continue; 1150 sa_addref(sav); 1151 goto done; 1152 } 1153 } 1154 } 1155 sav = NULL; 1156done: 1157 SAHTREE_UNLOCK(); 1158 1159 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1160 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1161 sav, sav ? sav->refcnt : 0)); 1162 return sav; 1163} 1164 1165/* 1166 * Must be called after calling key_allocsp(). 1167 * For both the packet without socket and key_freeso(). 1168 */ 1169void 1170_key_freesp(struct secpolicy **spp, const char* where, int tag) 1171{ 1172 struct secpolicy *sp = *spp; 1173 1174 IPSEC_ASSERT(sp != NULL, ("null sp")); 1175 1176 SPTREE_LOCK(); 1177 SP_DELREF(sp); 1178 1179 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1180 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1181 __func__, sp, sp->id, where, tag, sp->refcnt)); 1182 1183 if (sp->refcnt == 0) { 1184 *spp = NULL; 1185 key_delsp(sp); 1186 } 1187 SPTREE_UNLOCK(); 1188} 1189 1190/* 1191 * Must be called after calling key_allocsp(). 1192 * For the packet with socket. 1193 */ 1194void 1195key_freeso(struct socket *so) 1196{ 1197 IPSEC_ASSERT(so != NULL, ("null so")); 1198 1199 switch (so->so_proto->pr_domain->dom_family) { 1200#if defined(INET) || defined(INET6) 1201#ifdef INET 1202 case PF_INET: 1203#endif 1204#ifdef INET6 1205 case PF_INET6: 1206#endif 1207 { 1208 struct inpcb *pcb = sotoinpcb(so); 1209 1210 /* Does it have a PCB ? */ 1211 if (pcb == NULL) 1212 return; 1213 key_freesp_so(&pcb->inp_sp->sp_in); 1214 key_freesp_so(&pcb->inp_sp->sp_out); 1215 } 1216 break; 1217#endif /* INET || INET6 */ 1218 default: 1219 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1220 __func__, so->so_proto->pr_domain->dom_family)); 1221 return; 1222 } 1223} 1224 1225static void 1226key_freesp_so(struct secpolicy **sp) 1227{ 1228 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1229 1230 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1231 (*sp)->policy == IPSEC_POLICY_BYPASS) 1232 return; 1233 1234 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1235 ("invalid policy %u", (*sp)->policy)); 1236 KEY_FREESP(sp); 1237} 1238 1239void 1240key_addrefsa(struct secasvar *sav, const char* where, int tag) 1241{ 1242 1243 IPSEC_ASSERT(sav != NULL, ("null sav")); 1244 IPSEC_ASSERT(sav->refcnt > 0, ("refcount must exist")); 1245 1246 sa_addref(sav); 1247} 1248 1249/* 1250 * Must be called after calling key_allocsa(). 1251 * This function is called by key_freesp() to free some SA allocated 1252 * for a policy. 1253 */ 1254void 1255key_freesav(struct secasvar **psav, const char* where, int tag) 1256{ 1257 struct secasvar *sav = *psav; 1258 1259 IPSEC_ASSERT(sav != NULL, ("null sav")); 1260 1261 if (sa_delref(sav)) { 1262 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1263 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1264 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1265 *psav = NULL; 1266 key_delsav(sav); 1267 } else { 1268 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1269 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1270 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1271 } 1272} 1273 1274/* %%% SPD management */ 1275/* 1276 * free security policy entry. 1277 */ 1278static void 1279key_delsp(struct secpolicy *sp) 1280{ 1281 struct ipsecrequest *isr, *nextisr; 1282 1283 IPSEC_ASSERT(sp != NULL, ("null sp")); 1284 SPTREE_LOCK_ASSERT(); 1285 1286 sp->state = IPSEC_SPSTATE_DEAD; 1287 1288 IPSEC_ASSERT(sp->refcnt == 0, 1289 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1290 1291 /* remove from SP index */ 1292 if (__LIST_CHAINED(sp)) 1293 LIST_REMOVE(sp, chain); 1294 1295 for (isr = sp->req; isr != NULL; isr = nextisr) { 1296 if (isr->sav != NULL) { 1297 KEY_FREESAV(&isr->sav); 1298 isr->sav = NULL; 1299 } 1300 1301 nextisr = isr->next; 1302 ipsec_delisr(isr); 1303 } 1304 _key_delsp(sp); 1305} 1306 1307/* 1308 * search SPD 1309 * OUT: NULL : not found 1310 * others : found, pointer to a SP. 1311 */ 1312static struct secpolicy * 1313key_getsp(struct secpolicyindex *spidx) 1314{ 1315 struct secpolicy *sp; 1316 1317 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1318 1319 SPTREE_LOCK(); 1320 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1321 if (sp->state == IPSEC_SPSTATE_DEAD) 1322 continue; 1323 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1324 SP_ADDREF(sp); 1325 break; 1326 } 1327 } 1328 SPTREE_UNLOCK(); 1329 1330 return sp; 1331} 1332 1333/* 1334 * get SP by index. 1335 * OUT: NULL : not found 1336 * others : found, pointer to a SP. 1337 */ 1338static struct secpolicy * 1339key_getspbyid(u_int32_t id) 1340{ 1341 struct secpolicy *sp; 1342 1343 SPTREE_LOCK(); 1344 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1345 if (sp->state == IPSEC_SPSTATE_DEAD) 1346 continue; 1347 if (sp->id == id) { 1348 SP_ADDREF(sp); 1349 goto done; 1350 } 1351 } 1352 1353 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1354 if (sp->state == IPSEC_SPSTATE_DEAD) 1355 continue; 1356 if (sp->id == id) { 1357 SP_ADDREF(sp); 1358 goto done; 1359 } 1360 } 1361done: 1362 SPTREE_UNLOCK(); 1363 1364 return sp; 1365} 1366 1367struct secpolicy * 1368key_newsp(const char* where, int tag) 1369{ 1370 struct secpolicy *newsp = NULL; 1371 1372 newsp = (struct secpolicy *) 1373 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1374 if (newsp) { 1375 SECPOLICY_LOCK_INIT(newsp); 1376 newsp->refcnt = 1; 1377 newsp->req = NULL; 1378 } 1379 1380 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1381 printf("DP %s from %s:%u return SP:%p\n", __func__, 1382 where, tag, newsp)); 1383 return newsp; 1384} 1385 1386static void 1387_key_delsp(struct secpolicy *sp) 1388{ 1389 SECPOLICY_LOCK_DESTROY(sp); 1390 free(sp, M_IPSEC_SP); 1391} 1392 1393/* 1394 * create secpolicy structure from sadb_x_policy structure. 1395 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1396 * so must be set properly later. 1397 */ 1398struct secpolicy * 1399key_msg2sp(struct sadb_x_policy *xpl0, size_t len, int *error) 1400{ 1401 struct secpolicy *newsp; 1402 1403 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1404 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1405 1406 if (len != PFKEY_EXTLEN(xpl0)) { 1407 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1408 *error = EINVAL; 1409 return NULL; 1410 } 1411 1412 if ((newsp = KEY_NEWSP()) == NULL) { 1413 *error = ENOBUFS; 1414 return NULL; 1415 } 1416 1417 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1418 newsp->policy = xpl0->sadb_x_policy_type; 1419 1420 /* check policy */ 1421 switch (xpl0->sadb_x_policy_type) { 1422 case IPSEC_POLICY_DISCARD: 1423 case IPSEC_POLICY_NONE: 1424 case IPSEC_POLICY_ENTRUST: 1425 case IPSEC_POLICY_BYPASS: 1426 newsp->req = NULL; 1427 break; 1428 1429 case IPSEC_POLICY_IPSEC: 1430 { 1431 int tlen; 1432 struct sadb_x_ipsecrequest *xisr; 1433 struct ipsecrequest **p_isr = &newsp->req; 1434 1435 /* validity check */ 1436 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1437 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1438 __func__)); 1439 KEY_FREESP(&newsp); 1440 *error = EINVAL; 1441 return NULL; 1442 } 1443 1444 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1445 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1446 1447 while (tlen > 0) { 1448 /* length check */ 1449 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1450 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1451 "length.\n", __func__)); 1452 KEY_FREESP(&newsp); 1453 *error = EINVAL; 1454 return NULL; 1455 } 1456 1457 /* allocate request buffer */ 1458 /* NB: data structure is zero'd */ 1459 *p_isr = ipsec_newisr(); 1460 if ((*p_isr) == NULL) { 1461 ipseclog((LOG_DEBUG, 1462 "%s: No more memory.\n", __func__)); 1463 KEY_FREESP(&newsp); 1464 *error = ENOBUFS; 1465 return NULL; 1466 } 1467 1468 /* set values */ 1469 switch (xisr->sadb_x_ipsecrequest_proto) { 1470 case IPPROTO_ESP: 1471 case IPPROTO_AH: 1472 case IPPROTO_IPCOMP: 1473 break; 1474 default: 1475 ipseclog((LOG_DEBUG, 1476 "%s: invalid proto type=%u\n", __func__, 1477 xisr->sadb_x_ipsecrequest_proto)); 1478 KEY_FREESP(&newsp); 1479 *error = EPROTONOSUPPORT; 1480 return NULL; 1481 } 1482 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1483 1484 switch (xisr->sadb_x_ipsecrequest_mode) { 1485 case IPSEC_MODE_TRANSPORT: 1486 case IPSEC_MODE_TUNNEL: 1487 break; 1488 case IPSEC_MODE_ANY: 1489 default: 1490 ipseclog((LOG_DEBUG, 1491 "%s: invalid mode=%u\n", __func__, 1492 xisr->sadb_x_ipsecrequest_mode)); 1493 KEY_FREESP(&newsp); 1494 *error = EINVAL; 1495 return NULL; 1496 } 1497 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1498 1499 switch (xisr->sadb_x_ipsecrequest_level) { 1500 case IPSEC_LEVEL_DEFAULT: 1501 case IPSEC_LEVEL_USE: 1502 case IPSEC_LEVEL_REQUIRE: 1503 break; 1504 case IPSEC_LEVEL_UNIQUE: 1505 /* validity check */ 1506 /* 1507 * If range violation of reqid, kernel will 1508 * update it, don't refuse it. 1509 */ 1510 if (xisr->sadb_x_ipsecrequest_reqid 1511 > IPSEC_MANUAL_REQID_MAX) { 1512 ipseclog((LOG_DEBUG, 1513 "%s: reqid=%d range " 1514 "violation, updated by kernel.\n", 1515 __func__, 1516 xisr->sadb_x_ipsecrequest_reqid)); 1517 xisr->sadb_x_ipsecrequest_reqid = 0; 1518 } 1519 1520 /* allocate new reqid id if reqid is zero. */ 1521 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1522 u_int32_t reqid; 1523 if ((reqid = key_newreqid()) == 0) { 1524 KEY_FREESP(&newsp); 1525 *error = ENOBUFS; 1526 return NULL; 1527 } 1528 (*p_isr)->saidx.reqid = reqid; 1529 xisr->sadb_x_ipsecrequest_reqid = reqid; 1530 } else { 1531 /* set it for manual keying. */ 1532 (*p_isr)->saidx.reqid = 1533 xisr->sadb_x_ipsecrequest_reqid; 1534 } 1535 break; 1536 1537 default: 1538 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1539 __func__, 1540 xisr->sadb_x_ipsecrequest_level)); 1541 KEY_FREESP(&newsp); 1542 *error = EINVAL; 1543 return NULL; 1544 } 1545 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1546 1547 /* set IP addresses if there */ 1548 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1549 struct sockaddr *paddr; 1550 1551 paddr = (struct sockaddr *)(xisr + 1); 1552 1553 /* validity check */ 1554 if (paddr->sa_len 1555 > sizeof((*p_isr)->saidx.src)) { 1556 ipseclog((LOG_DEBUG, "%s: invalid " 1557 "request address length.\n", 1558 __func__)); 1559 KEY_FREESP(&newsp); 1560 *error = EINVAL; 1561 return NULL; 1562 } 1563 bcopy(paddr, &(*p_isr)->saidx.src, 1564 paddr->sa_len); 1565 1566 paddr = (struct sockaddr *)((caddr_t)paddr 1567 + paddr->sa_len); 1568 1569 /* validity check */ 1570 if (paddr->sa_len 1571 > sizeof((*p_isr)->saidx.dst)) { 1572 ipseclog((LOG_DEBUG, "%s: invalid " 1573 "request address length.\n", 1574 __func__)); 1575 KEY_FREESP(&newsp); 1576 *error = EINVAL; 1577 return NULL; 1578 } 1579 bcopy(paddr, &(*p_isr)->saidx.dst, 1580 paddr->sa_len); 1581 } 1582 1583 (*p_isr)->sp = newsp; 1584 1585 /* initialization for the next. */ 1586 p_isr = &(*p_isr)->next; 1587 tlen -= xisr->sadb_x_ipsecrequest_len; 1588 1589 /* validity check */ 1590 if (tlen < 0) { 1591 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1592 __func__)); 1593 KEY_FREESP(&newsp); 1594 *error = EINVAL; 1595 return NULL; 1596 } 1597 1598 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1599 + xisr->sadb_x_ipsecrequest_len); 1600 } 1601 } 1602 break; 1603 default: 1604 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1605 KEY_FREESP(&newsp); 1606 *error = EINVAL; 1607 return NULL; 1608 } 1609 1610 *error = 0; 1611 return newsp; 1612} 1613 1614static u_int32_t 1615key_newreqid() 1616{ 1617 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1618 1619 auto_reqid = (auto_reqid == ~0 1620 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1621 1622 /* XXX should be unique check */ 1623 1624 return auto_reqid; 1625} 1626 1627/* 1628 * copy secpolicy struct to sadb_x_policy structure indicated. 1629 */ 1630struct mbuf * 1631key_sp2msg(struct secpolicy *sp) 1632{ 1633 struct sadb_x_policy *xpl; 1634 int tlen; 1635 caddr_t p; 1636 struct mbuf *m; 1637 1638 IPSEC_ASSERT(sp != NULL, ("null policy")); 1639 1640 tlen = key_getspreqmsglen(sp); 1641 1642 m = m_get2(tlen, M_NOWAIT, MT_DATA, 0); 1643 if (m == NULL) 1644 return (NULL); 1645 m_align(m, tlen); 1646 m->m_len = tlen; 1647 xpl = mtod(m, struct sadb_x_policy *); 1648 bzero(xpl, tlen); 1649 1650 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1651 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1652 xpl->sadb_x_policy_type = sp->policy; 1653 xpl->sadb_x_policy_dir = sp->spidx.dir; 1654 xpl->sadb_x_policy_id = sp->id; 1655 p = (caddr_t)xpl + sizeof(*xpl); 1656 1657 /* if is the policy for ipsec ? */ 1658 if (sp->policy == IPSEC_POLICY_IPSEC) { 1659 struct sadb_x_ipsecrequest *xisr; 1660 struct ipsecrequest *isr; 1661 1662 for (isr = sp->req; isr != NULL; isr = isr->next) { 1663 1664 xisr = (struct sadb_x_ipsecrequest *)p; 1665 1666 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1667 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1668 xisr->sadb_x_ipsecrequest_level = isr->level; 1669 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1670 1671 p += sizeof(*xisr); 1672 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1673 p += isr->saidx.src.sa.sa_len; 1674 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1675 p += isr->saidx.src.sa.sa_len; 1676 1677 xisr->sadb_x_ipsecrequest_len = 1678 PFKEY_ALIGN8(sizeof(*xisr) 1679 + isr->saidx.src.sa.sa_len 1680 + isr->saidx.dst.sa.sa_len); 1681 } 1682 } 1683 1684 return m; 1685} 1686 1687/* m will not be freed nor modified */ 1688static struct mbuf * 1689key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1690 int ndeep, int nitem, ...) 1691{ 1692 va_list ap; 1693 int idx; 1694 int i; 1695 struct mbuf *result = NULL, *n; 1696 int len; 1697 1698 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1699 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1700 1701 va_start(ap, nitem); 1702 for (i = 0; i < nitem; i++) { 1703 idx = va_arg(ap, int); 1704 if (idx < 0 || idx > SADB_EXT_MAX) 1705 goto fail; 1706 /* don't attempt to pull empty extension */ 1707 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1708 continue; 1709 if (idx != SADB_EXT_RESERVED && 1710 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1711 continue; 1712 1713 if (idx == SADB_EXT_RESERVED) { 1714 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1715 1716 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1717 1718 MGETHDR(n, M_NOWAIT, MT_DATA); 1719 if (!n) 1720 goto fail; 1721 n->m_len = len; 1722 n->m_next = NULL; 1723 m_copydata(m, 0, sizeof(struct sadb_msg), 1724 mtod(n, caddr_t)); 1725 } else if (i < ndeep) { 1726 len = mhp->extlen[idx]; 1727 n = m_get2(len, M_NOWAIT, MT_DATA, 0); 1728 if (n == NULL) 1729 goto fail; 1730 m_align(n, len); 1731 n->m_len = len; 1732 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1733 mtod(n, caddr_t)); 1734 } else { 1735 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1736 M_NOWAIT); 1737 } 1738 if (n == NULL) 1739 goto fail; 1740 1741 if (result) 1742 m_cat(result, n); 1743 else 1744 result = n; 1745 } 1746 va_end(ap); 1747 1748 if ((result->m_flags & M_PKTHDR) != 0) { 1749 result->m_pkthdr.len = 0; 1750 for (n = result; n; n = n->m_next) 1751 result->m_pkthdr.len += n->m_len; 1752 } 1753 1754 return result; 1755 1756fail: 1757 m_freem(result); 1758 va_end(ap); 1759 return NULL; 1760} 1761 1762/* 1763 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1764 * add an entry to SP database, when received 1765 * <base, address(SD), (lifetime(H),) policy> 1766 * from the user(?). 1767 * Adding to SP database, 1768 * and send 1769 * <base, address(SD), (lifetime(H),) policy> 1770 * to the socket which was send. 1771 * 1772 * SPDADD set a unique policy entry. 1773 * SPDSETIDX like SPDADD without a part of policy requests. 1774 * SPDUPDATE replace a unique policy entry. 1775 * 1776 * m will always be freed. 1777 */ 1778static int 1779key_spdadd(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 1780{ 1781 struct sadb_address *src0, *dst0; 1782 struct sadb_x_policy *xpl0, *xpl; 1783 struct sadb_lifetime *lft = NULL; 1784 struct secpolicyindex spidx; 1785 struct secpolicy *newsp; 1786 int error; 1787 1788 IPSEC_ASSERT(so != NULL, ("null socket")); 1789 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1790 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1791 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1792 1793 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1794 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1795 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1796 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1797 return key_senderror(so, m, EINVAL); 1798 } 1799 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1800 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1801 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1802 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1803 __func__)); 1804 return key_senderror(so, m, EINVAL); 1805 } 1806 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1807 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1808 < sizeof(struct sadb_lifetime)) { 1809 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1810 __func__)); 1811 return key_senderror(so, m, EINVAL); 1812 } 1813 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1814 } 1815 1816 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1817 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1818 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1819 1820 /* 1821 * Note: do not parse SADB_X_EXT_NAT_T_* here: 1822 * we are processing traffic endpoints. 1823 */ 1824 1825 /* make secindex */ 1826 /* XXX boundary check against sa_len */ 1827 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1828 src0 + 1, 1829 dst0 + 1, 1830 src0->sadb_address_prefixlen, 1831 dst0->sadb_address_prefixlen, 1832 src0->sadb_address_proto, 1833 &spidx); 1834 1835 /* checking the direciton. */ 1836 switch (xpl0->sadb_x_policy_dir) { 1837 case IPSEC_DIR_INBOUND: 1838 case IPSEC_DIR_OUTBOUND: 1839 break; 1840 default: 1841 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1842 mhp->msg->sadb_msg_errno = EINVAL; 1843 return 0; 1844 } 1845 1846 /* check policy */ 1847 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1848 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1849 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1850 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1851 return key_senderror(so, m, EINVAL); 1852 } 1853 1854 /* policy requests are mandatory when action is ipsec. */ 1855 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1856 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1857 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1858 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1859 __func__)); 1860 return key_senderror(so, m, EINVAL); 1861 } 1862 1863 /* 1864 * checking there is SP already or not. 1865 * SPDUPDATE doesn't depend on whether there is a SP or not. 1866 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1867 * then error. 1868 */ 1869 newsp = key_getsp(&spidx); 1870 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1871 if (newsp) { 1872 SPTREE_LOCK(); 1873 newsp->state = IPSEC_SPSTATE_DEAD; 1874 SPTREE_UNLOCK(); 1875 KEY_FREESP(&newsp); 1876 } 1877 } else { 1878 if (newsp != NULL) { 1879 KEY_FREESP(&newsp); 1880 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1881 __func__)); 1882 return key_senderror(so, m, EEXIST); 1883 } 1884 } 1885 1886 /* allocation new SP entry */ 1887 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1888 return key_senderror(so, m, error); 1889 } 1890 1891 if ((newsp->id = key_getnewspid()) == 0) { 1892 _key_delsp(newsp); 1893 return key_senderror(so, m, ENOBUFS); 1894 } 1895 1896 /* XXX boundary check against sa_len */ 1897 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1898 src0 + 1, 1899 dst0 + 1, 1900 src0->sadb_address_prefixlen, 1901 dst0->sadb_address_prefixlen, 1902 src0->sadb_address_proto, 1903 &newsp->spidx); 1904 1905 /* sanity check on addr pair */ 1906 if (((struct sockaddr *)(src0 + 1))->sa_family != 1907 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1908 _key_delsp(newsp); 1909 return key_senderror(so, m, EINVAL); 1910 } 1911 if (((struct sockaddr *)(src0 + 1))->sa_len != 1912 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1913 _key_delsp(newsp); 1914 return key_senderror(so, m, EINVAL); 1915 } 1916#if 1 1917 if (newsp->req && newsp->req->saidx.src.sa.sa_family && newsp->req->saidx.dst.sa.sa_family) { 1918 if (newsp->req->saidx.src.sa.sa_family != newsp->req->saidx.dst.sa.sa_family) { 1919 _key_delsp(newsp); 1920 return key_senderror(so, m, EINVAL); 1921 } 1922 } 1923#endif 1924 1925 newsp->created = time_second; 1926 newsp->lastused = newsp->created; 1927 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1928 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1929 1930 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1931 newsp->state = IPSEC_SPSTATE_ALIVE; 1932 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1933 1934 /* delete the entry in spacqtree */ 1935 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1936 struct secspacq *spacq = key_getspacq(&spidx); 1937 if (spacq != NULL) { 1938 /* reset counter in order to deletion by timehandler. */ 1939 spacq->created = time_second; 1940 spacq->count = 0; 1941 SPACQ_UNLOCK(); 1942 } 1943 } 1944 1945 { 1946 struct mbuf *n, *mpolicy; 1947 struct sadb_msg *newmsg; 1948 int off; 1949 1950 /* 1951 * Note: do not send SADB_X_EXT_NAT_T_* here: 1952 * we are sending traffic endpoints. 1953 */ 1954 1955 /* create new sadb_msg to reply. */ 1956 if (lft) { 1957 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1958 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1959 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1960 } else { 1961 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1962 SADB_X_EXT_POLICY, 1963 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1964 } 1965 if (!n) 1966 return key_senderror(so, m, ENOBUFS); 1967 1968 if (n->m_len < sizeof(*newmsg)) { 1969 n = m_pullup(n, sizeof(*newmsg)); 1970 if (!n) 1971 return key_senderror(so, m, ENOBUFS); 1972 } 1973 newmsg = mtod(n, struct sadb_msg *); 1974 newmsg->sadb_msg_errno = 0; 1975 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1976 1977 off = 0; 1978 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1979 sizeof(*xpl), &off); 1980 if (mpolicy == NULL) { 1981 /* n is already freed */ 1982 return key_senderror(so, m, ENOBUFS); 1983 } 1984 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1985 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1986 m_freem(n); 1987 return key_senderror(so, m, EINVAL); 1988 } 1989 xpl->sadb_x_policy_id = newsp->id; 1990 1991 m_freem(m); 1992 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1993 } 1994} 1995 1996/* 1997 * get new policy id. 1998 * OUT: 1999 * 0: failure. 2000 * others: success. 2001 */ 2002static u_int32_t 2003key_getnewspid() 2004{ 2005 u_int32_t newid = 0; 2006 int count = V_key_spi_trycnt; /* XXX */ 2007 struct secpolicy *sp; 2008 2009 /* when requesting to allocate spi ranged */ 2010 while (count--) { 2011 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 2012 2013 if ((sp = key_getspbyid(newid)) == NULL) 2014 break; 2015 2016 KEY_FREESP(&sp); 2017 } 2018 2019 if (count == 0 || newid == 0) { 2020 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2021 __func__)); 2022 return 0; 2023 } 2024 2025 return newid; 2026} 2027 2028/* 2029 * SADB_SPDDELETE processing 2030 * receive 2031 * <base, address(SD), policy(*)> 2032 * from the user(?), and set SADB_SASTATE_DEAD, 2033 * and send, 2034 * <base, address(SD), policy(*)> 2035 * to the ikmpd. 2036 * policy(*) including direction of policy. 2037 * 2038 * m will always be freed. 2039 */ 2040static int 2041key_spddelete(struct socket *so, struct mbuf *m, 2042 const struct sadb_msghdr *mhp) 2043{ 2044 struct sadb_address *src0, *dst0; 2045 struct sadb_x_policy *xpl0; 2046 struct secpolicyindex spidx; 2047 struct secpolicy *sp; 2048 2049 IPSEC_ASSERT(so != NULL, ("null so")); 2050 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2051 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2052 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2053 2054 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2055 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2056 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2057 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2058 __func__)); 2059 return key_senderror(so, m, EINVAL); 2060 } 2061 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2062 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2063 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2064 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2065 __func__)); 2066 return key_senderror(so, m, EINVAL); 2067 } 2068 2069 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2070 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2071 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2072 2073 /* 2074 * Note: do not parse SADB_X_EXT_NAT_T_* here: 2075 * we are processing traffic endpoints. 2076 */ 2077 2078 /* make secindex */ 2079 /* XXX boundary check against sa_len */ 2080 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2081 src0 + 1, 2082 dst0 + 1, 2083 src0->sadb_address_prefixlen, 2084 dst0->sadb_address_prefixlen, 2085 src0->sadb_address_proto, 2086 &spidx); 2087 2088 /* checking the direciton. */ 2089 switch (xpl0->sadb_x_policy_dir) { 2090 case IPSEC_DIR_INBOUND: 2091 case IPSEC_DIR_OUTBOUND: 2092 break; 2093 default: 2094 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2095 return key_senderror(so, m, EINVAL); 2096 } 2097 2098 /* Is there SP in SPD ? */ 2099 if ((sp = key_getsp(&spidx)) == NULL) { 2100 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2101 return key_senderror(so, m, EINVAL); 2102 } 2103 2104 /* save policy id to buffer to be returned. */ 2105 xpl0->sadb_x_policy_id = sp->id; 2106 2107 SPTREE_LOCK(); 2108 sp->state = IPSEC_SPSTATE_DEAD; 2109 SPTREE_UNLOCK(); 2110 KEY_FREESP(&sp); 2111 2112 { 2113 struct mbuf *n; 2114 struct sadb_msg *newmsg; 2115 2116 /* 2117 * Note: do not send SADB_X_EXT_NAT_T_* here: 2118 * we are sending traffic endpoints. 2119 */ 2120 2121 /* create new sadb_msg to reply. */ 2122 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2123 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2124 if (!n) 2125 return key_senderror(so, m, ENOBUFS); 2126 2127 newmsg = mtod(n, struct sadb_msg *); 2128 newmsg->sadb_msg_errno = 0; 2129 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2130 2131 m_freem(m); 2132 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2133 } 2134} 2135 2136/* 2137 * SADB_SPDDELETE2 processing 2138 * receive 2139 * <base, policy(*)> 2140 * from the user(?), and set SADB_SASTATE_DEAD, 2141 * and send, 2142 * <base, policy(*)> 2143 * to the ikmpd. 2144 * policy(*) including direction of policy. 2145 * 2146 * m will always be freed. 2147 */ 2148static int 2149key_spddelete2(struct socket *so, struct mbuf *m, 2150 const struct sadb_msghdr *mhp) 2151{ 2152 u_int32_t id; 2153 struct secpolicy *sp; 2154 2155 IPSEC_ASSERT(so != NULL, ("null socket")); 2156 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2157 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2158 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2159 2160 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2161 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2162 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2163 return key_senderror(so, m, EINVAL); 2164 } 2165 2166 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2167 2168 /* Is there SP in SPD ? */ 2169 if ((sp = key_getspbyid(id)) == NULL) { 2170 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2171 return key_senderror(so, m, EINVAL); 2172 } 2173 2174 SPTREE_LOCK(); 2175 sp->state = IPSEC_SPSTATE_DEAD; 2176 SPTREE_UNLOCK(); 2177 KEY_FREESP(&sp); 2178 2179 { 2180 struct mbuf *n, *nn; 2181 struct sadb_msg *newmsg; 2182 int off, len; 2183 2184 /* create new sadb_msg to reply. */ 2185 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2186 2187 MGETHDR(n, M_NOWAIT, MT_DATA); 2188 if (n && len > MHLEN) { 2189 MCLGET(n, M_NOWAIT); 2190 if ((n->m_flags & M_EXT) == 0) { 2191 m_freem(n); 2192 n = NULL; 2193 } 2194 } 2195 if (!n) 2196 return key_senderror(so, m, ENOBUFS); 2197 2198 n->m_len = len; 2199 n->m_next = NULL; 2200 off = 0; 2201 2202 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2203 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2204 2205 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2206 off, len)); 2207 2208 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2209 mhp->extlen[SADB_X_EXT_POLICY], M_NOWAIT); 2210 if (!n->m_next) { 2211 m_freem(n); 2212 return key_senderror(so, m, ENOBUFS); 2213 } 2214 2215 n->m_pkthdr.len = 0; 2216 for (nn = n; nn; nn = nn->m_next) 2217 n->m_pkthdr.len += nn->m_len; 2218 2219 newmsg = mtod(n, struct sadb_msg *); 2220 newmsg->sadb_msg_errno = 0; 2221 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2222 2223 m_freem(m); 2224 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2225 } 2226} 2227 2228/* 2229 * SADB_X_GET processing 2230 * receive 2231 * <base, policy(*)> 2232 * from the user(?), 2233 * and send, 2234 * <base, address(SD), policy> 2235 * to the ikmpd. 2236 * policy(*) including direction of policy. 2237 * 2238 * m will always be freed. 2239 */ 2240static int 2241key_spdget(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2242{ 2243 u_int32_t id; 2244 struct secpolicy *sp; 2245 struct mbuf *n; 2246 2247 IPSEC_ASSERT(so != NULL, ("null socket")); 2248 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2249 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2250 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2251 2252 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2253 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2254 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2255 __func__)); 2256 return key_senderror(so, m, EINVAL); 2257 } 2258 2259 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2260 2261 /* Is there SP in SPD ? */ 2262 if ((sp = key_getspbyid(id)) == NULL) { 2263 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2264 return key_senderror(so, m, ENOENT); 2265 } 2266 2267 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2268 KEY_FREESP(&sp); 2269 if (n != NULL) { 2270 m_freem(m); 2271 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2272 } else 2273 return key_senderror(so, m, ENOBUFS); 2274} 2275 2276/* 2277 * SADB_X_SPDACQUIRE processing. 2278 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2279 * send 2280 * <base, policy(*)> 2281 * to KMD, and expect to receive 2282 * <base> with SADB_X_SPDACQUIRE if error occured, 2283 * or 2284 * <base, policy> 2285 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2286 * policy(*) is without policy requests. 2287 * 2288 * 0 : succeed 2289 * others: error number 2290 */ 2291int 2292key_spdacquire(struct secpolicy *sp) 2293{ 2294 struct mbuf *result = NULL, *m; 2295 struct secspacq *newspacq; 2296 2297 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2298 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2299 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2300 ("policy not IPSEC %u", sp->policy)); 2301 2302 /* Get an entry to check whether sent message or not. */ 2303 newspacq = key_getspacq(&sp->spidx); 2304 if (newspacq != NULL) { 2305 if (V_key_blockacq_count < newspacq->count) { 2306 /* reset counter and do send message. */ 2307 newspacq->count = 0; 2308 } else { 2309 /* increment counter and do nothing. */ 2310 newspacq->count++; 2311 SPACQ_UNLOCK(); 2312 return (0); 2313 } 2314 SPACQ_UNLOCK(); 2315 } else { 2316 /* make new entry for blocking to send SADB_ACQUIRE. */ 2317 newspacq = key_newspacq(&sp->spidx); 2318 if (newspacq == NULL) 2319 return ENOBUFS; 2320 } 2321 2322 /* create new sadb_msg to reply. */ 2323 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2324 if (!m) 2325 return ENOBUFS; 2326 2327 result = m; 2328 2329 result->m_pkthdr.len = 0; 2330 for (m = result; m; m = m->m_next) 2331 result->m_pkthdr.len += m->m_len; 2332 2333 mtod(result, struct sadb_msg *)->sadb_msg_len = 2334 PFKEY_UNIT64(result->m_pkthdr.len); 2335 2336 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2337} 2338 2339/* 2340 * SADB_SPDFLUSH processing 2341 * receive 2342 * <base> 2343 * from the user, and free all entries in secpctree. 2344 * and send, 2345 * <base> 2346 * to the user. 2347 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2348 * 2349 * m will always be freed. 2350 */ 2351static int 2352key_spdflush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2353{ 2354 struct sadb_msg *newmsg; 2355 struct secpolicy *sp; 2356 u_int dir; 2357 2358 IPSEC_ASSERT(so != NULL, ("null socket")); 2359 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2360 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2361 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2362 2363 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2364 return key_senderror(so, m, EINVAL); 2365 2366 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2367 SPTREE_LOCK(); 2368 LIST_FOREACH(sp, &V_sptree[dir], chain) 2369 sp->state = IPSEC_SPSTATE_DEAD; 2370 SPTREE_UNLOCK(); 2371 } 2372 2373 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2374 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2375 return key_senderror(so, m, ENOBUFS); 2376 } 2377 2378 if (m->m_next) 2379 m_freem(m->m_next); 2380 m->m_next = NULL; 2381 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2382 newmsg = mtod(m, struct sadb_msg *); 2383 newmsg->sadb_msg_errno = 0; 2384 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2385 2386 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2387} 2388 2389/* 2390 * SADB_SPDDUMP processing 2391 * receive 2392 * <base> 2393 * from the user, and dump all SP leaves 2394 * and send, 2395 * <base> ..... 2396 * to the ikmpd. 2397 * 2398 * m will always be freed. 2399 */ 2400static int 2401key_spddump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 2402{ 2403 struct secpolicy *sp; 2404 int cnt; 2405 u_int dir; 2406 struct mbuf *n; 2407 2408 IPSEC_ASSERT(so != NULL, ("null socket")); 2409 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2410 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2411 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2412 2413 /* search SPD entry and get buffer size. */ 2414 cnt = 0; 2415 SPTREE_LOCK(); 2416 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2417 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2418 cnt++; 2419 } 2420 } 2421 2422 if (cnt == 0) { 2423 SPTREE_UNLOCK(); 2424 return key_senderror(so, m, ENOENT); 2425 } 2426 2427 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2428 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2429 --cnt; 2430 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2431 mhp->msg->sadb_msg_pid); 2432 2433 if (n) 2434 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2435 } 2436 } 2437 2438 SPTREE_UNLOCK(); 2439 m_freem(m); 2440 return 0; 2441} 2442 2443static struct mbuf * 2444key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, 2445 u_int32_t pid) 2446{ 2447 struct mbuf *result = NULL, *m; 2448 struct seclifetime lt; 2449 2450 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2451 if (!m) 2452 goto fail; 2453 result = m; 2454 2455 /* 2456 * Note: do not send SADB_X_EXT_NAT_T_* here: 2457 * we are sending traffic endpoints. 2458 */ 2459 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2460 &sp->spidx.src.sa, sp->spidx.prefs, 2461 sp->spidx.ul_proto); 2462 if (!m) 2463 goto fail; 2464 m_cat(result, m); 2465 2466 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2467 &sp->spidx.dst.sa, sp->spidx.prefd, 2468 sp->spidx.ul_proto); 2469 if (!m) 2470 goto fail; 2471 m_cat(result, m); 2472 2473 m = key_sp2msg(sp); 2474 if (!m) 2475 goto fail; 2476 m_cat(result, m); 2477 2478 if(sp->lifetime){ 2479 lt.addtime=sp->created; 2480 lt.usetime= sp->lastused; 2481 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2482 if (!m) 2483 goto fail; 2484 m_cat(result, m); 2485 2486 lt.addtime=sp->lifetime; 2487 lt.usetime= sp->validtime; 2488 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2489 if (!m) 2490 goto fail; 2491 m_cat(result, m); 2492 } 2493 2494 if ((result->m_flags & M_PKTHDR) == 0) 2495 goto fail; 2496 2497 if (result->m_len < sizeof(struct sadb_msg)) { 2498 result = m_pullup(result, sizeof(struct sadb_msg)); 2499 if (result == NULL) 2500 goto fail; 2501 } 2502 2503 result->m_pkthdr.len = 0; 2504 for (m = result; m; m = m->m_next) 2505 result->m_pkthdr.len += m->m_len; 2506 2507 mtod(result, struct sadb_msg *)->sadb_msg_len = 2508 PFKEY_UNIT64(result->m_pkthdr.len); 2509 2510 return result; 2511 2512fail: 2513 m_freem(result); 2514 return NULL; 2515} 2516 2517/* 2518 * get PFKEY message length for security policy and request. 2519 */ 2520static u_int 2521key_getspreqmsglen(struct secpolicy *sp) 2522{ 2523 u_int tlen; 2524 2525 tlen = sizeof(struct sadb_x_policy); 2526 2527 /* if is the policy for ipsec ? */ 2528 if (sp->policy != IPSEC_POLICY_IPSEC) 2529 return tlen; 2530 2531 /* get length of ipsec requests */ 2532 { 2533 struct ipsecrequest *isr; 2534 int len; 2535 2536 for (isr = sp->req; isr != NULL; isr = isr->next) { 2537 len = sizeof(struct sadb_x_ipsecrequest) 2538 + isr->saidx.src.sa.sa_len 2539 + isr->saidx.dst.sa.sa_len; 2540 2541 tlen += PFKEY_ALIGN8(len); 2542 } 2543 } 2544 2545 return tlen; 2546} 2547 2548/* 2549 * SADB_SPDEXPIRE processing 2550 * send 2551 * <base, address(SD), lifetime(CH), policy> 2552 * to KMD by PF_KEY. 2553 * 2554 * OUT: 0 : succeed 2555 * others : error number 2556 */ 2557static int 2558key_spdexpire(struct secpolicy *sp) 2559{ 2560 struct mbuf *result = NULL, *m; 2561 int len; 2562 int error = -1; 2563 struct sadb_lifetime *lt; 2564 2565 /* XXX: Why do we lock ? */ 2566 2567 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2568 2569 /* set msg header */ 2570 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2571 if (!m) { 2572 error = ENOBUFS; 2573 goto fail; 2574 } 2575 result = m; 2576 2577 /* create lifetime extension (current and hard) */ 2578 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2579 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 2580 if (m == NULL) { 2581 error = ENOBUFS; 2582 goto fail; 2583 } 2584 m_align(m, len); 2585 m->m_len = len; 2586 bzero(mtod(m, caddr_t), len); 2587 lt = mtod(m, struct sadb_lifetime *); 2588 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2589 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2590 lt->sadb_lifetime_allocations = 0; 2591 lt->sadb_lifetime_bytes = 0; 2592 lt->sadb_lifetime_addtime = sp->created; 2593 lt->sadb_lifetime_usetime = sp->lastused; 2594 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2595 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2596 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2597 lt->sadb_lifetime_allocations = 0; 2598 lt->sadb_lifetime_bytes = 0; 2599 lt->sadb_lifetime_addtime = sp->lifetime; 2600 lt->sadb_lifetime_usetime = sp->validtime; 2601 m_cat(result, m); 2602 2603 /* 2604 * Note: do not send SADB_X_EXT_NAT_T_* here: 2605 * we are sending traffic endpoints. 2606 */ 2607 2608 /* set sadb_address for source */ 2609 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2610 &sp->spidx.src.sa, 2611 sp->spidx.prefs, sp->spidx.ul_proto); 2612 if (!m) { 2613 error = ENOBUFS; 2614 goto fail; 2615 } 2616 m_cat(result, m); 2617 2618 /* set sadb_address for destination */ 2619 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2620 &sp->spidx.dst.sa, 2621 sp->spidx.prefd, sp->spidx.ul_proto); 2622 if (!m) { 2623 error = ENOBUFS; 2624 goto fail; 2625 } 2626 m_cat(result, m); 2627 2628 /* set secpolicy */ 2629 m = key_sp2msg(sp); 2630 if (!m) { 2631 error = ENOBUFS; 2632 goto fail; 2633 } 2634 m_cat(result, m); 2635 2636 if ((result->m_flags & M_PKTHDR) == 0) { 2637 error = EINVAL; 2638 goto fail; 2639 } 2640 2641 if (result->m_len < sizeof(struct sadb_msg)) { 2642 result = m_pullup(result, sizeof(struct sadb_msg)); 2643 if (result == NULL) { 2644 error = ENOBUFS; 2645 goto fail; 2646 } 2647 } 2648 2649 result->m_pkthdr.len = 0; 2650 for (m = result; m; m = m->m_next) 2651 result->m_pkthdr.len += m->m_len; 2652 2653 mtod(result, struct sadb_msg *)->sadb_msg_len = 2654 PFKEY_UNIT64(result->m_pkthdr.len); 2655 2656 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2657 2658 fail: 2659 if (result) 2660 m_freem(result); 2661 return error; 2662} 2663 2664/* %%% SAD management */ 2665/* 2666 * allocating a memory for new SA head, and copy from the values of mhp. 2667 * OUT: NULL : failure due to the lack of memory. 2668 * others : pointer to new SA head. 2669 */ 2670static struct secashead * 2671key_newsah(struct secasindex *saidx) 2672{ 2673 struct secashead *newsah; 2674 2675 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2676 2677 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2678 if (newsah != NULL) { 2679 int i; 2680 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2681 LIST_INIT(&newsah->savtree[i]); 2682 newsah->saidx = *saidx; 2683 2684 /* add to saidxtree */ 2685 newsah->state = SADB_SASTATE_MATURE; 2686 2687 SAHTREE_LOCK(); 2688 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2689 SAHTREE_UNLOCK(); 2690 } 2691 return(newsah); 2692} 2693 2694/* 2695 * delete SA index and all SA registerd. 2696 */ 2697static void 2698key_delsah(struct secashead *sah) 2699{ 2700 struct secasvar *sav, *nextsav; 2701 u_int stateidx; 2702 int zombie = 0; 2703 2704 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2705 SAHTREE_LOCK_ASSERT(); 2706 2707 /* searching all SA registerd in the secindex. */ 2708 for (stateidx = 0; 2709 stateidx < _ARRAYLEN(saorder_state_any); 2710 stateidx++) { 2711 u_int state = saorder_state_any[stateidx]; 2712 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2713 if (sav->refcnt == 0) { 2714 /* sanity check */ 2715 KEY_CHKSASTATE(state, sav->state, __func__); 2716 /* 2717 * do NOT call KEY_FREESAV here: 2718 * it will only delete the sav if refcnt == 1, 2719 * where we already know that refcnt == 0 2720 */ 2721 key_delsav(sav); 2722 } else { 2723 /* give up to delete this sa */ 2724 zombie++; 2725 } 2726 } 2727 } 2728 if (!zombie) { /* delete only if there are savs */ 2729 /* remove from tree of SA index */ 2730 if (__LIST_CHAINED(sah)) 2731 LIST_REMOVE(sah, chain); 2732 free(sah, M_IPSEC_SAH); 2733 } 2734} 2735 2736/* 2737 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2738 * and copy the values of mhp into new buffer. 2739 * When SAD message type is GETSPI: 2740 * to set sequence number from acq_seq++, 2741 * to set zero to SPI. 2742 * not to call key_setsava(). 2743 * OUT: NULL : fail 2744 * others : pointer to new secasvar. 2745 * 2746 * does not modify mbuf. does not free mbuf on error. 2747 */ 2748static struct secasvar * 2749key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, 2750 struct secashead *sah, int *errp, const char *where, int tag) 2751{ 2752 struct secasvar *newsav; 2753 const struct sadb_sa *xsa; 2754 2755 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2756 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2757 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2758 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2759 2760 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2761 if (newsav == NULL) { 2762 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2763 *errp = ENOBUFS; 2764 goto done; 2765 } 2766 2767 switch (mhp->msg->sadb_msg_type) { 2768 case SADB_GETSPI: 2769 newsav->spi = 0; 2770 2771#ifdef IPSEC_DOSEQCHECK 2772 /* sync sequence number */ 2773 if (mhp->msg->sadb_msg_seq == 0) 2774 newsav->seq = 2775 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2776 else 2777#endif 2778 newsav->seq = mhp->msg->sadb_msg_seq; 2779 break; 2780 2781 case SADB_ADD: 2782 /* sanity check */ 2783 if (mhp->ext[SADB_EXT_SA] == NULL) { 2784 free(newsav, M_IPSEC_SA); 2785 newsav = NULL; 2786 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2787 __func__)); 2788 *errp = EINVAL; 2789 goto done; 2790 } 2791 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2792 newsav->spi = xsa->sadb_sa_spi; 2793 newsav->seq = mhp->msg->sadb_msg_seq; 2794 break; 2795 default: 2796 free(newsav, M_IPSEC_SA); 2797 newsav = NULL; 2798 *errp = EINVAL; 2799 goto done; 2800 } 2801 2802 2803 /* copy sav values */ 2804 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2805 *errp = key_setsaval(newsav, m, mhp); 2806 if (*errp) { 2807 free(newsav, M_IPSEC_SA); 2808 newsav = NULL; 2809 goto done; 2810 } 2811 } 2812 2813 SECASVAR_LOCK_INIT(newsav); 2814 2815 /* reset created */ 2816 newsav->created = time_second; 2817 newsav->pid = mhp->msg->sadb_msg_pid; 2818 2819 /* add to satree */ 2820 newsav->sah = sah; 2821 sa_initref(newsav); 2822 newsav->state = SADB_SASTATE_LARVAL; 2823 2824 SAHTREE_LOCK(); 2825 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2826 secasvar, chain); 2827 SAHTREE_UNLOCK(); 2828done: 2829 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2830 printf("DP %s from %s:%u return SP:%p\n", __func__, 2831 where, tag, newsav)); 2832 2833 return newsav; 2834} 2835 2836/* 2837 * free() SA variable entry. 2838 */ 2839static void 2840key_cleansav(struct secasvar *sav) 2841{ 2842 /* 2843 * Cleanup xform state. Note that zeroize'ing causes the 2844 * keys to be cleared; otherwise we must do it ourself. 2845 */ 2846 if (sav->tdb_xform != NULL) { 2847 sav->tdb_xform->xf_zeroize(sav); 2848 sav->tdb_xform = NULL; 2849 } else { 2850 KASSERT(sav->iv == NULL, ("iv but no xform")); 2851 if (sav->key_auth != NULL) 2852 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2853 if (sav->key_enc != NULL) 2854 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2855 } 2856 if (sav->key_auth != NULL) { 2857 if (sav->key_auth->key_data != NULL) 2858 free(sav->key_auth->key_data, M_IPSEC_MISC); 2859 free(sav->key_auth, M_IPSEC_MISC); 2860 sav->key_auth = NULL; 2861 } 2862 if (sav->key_enc != NULL) { 2863 if (sav->key_enc->key_data != NULL) 2864 free(sav->key_enc->key_data, M_IPSEC_MISC); 2865 free(sav->key_enc, M_IPSEC_MISC); 2866 sav->key_enc = NULL; 2867 } 2868 if (sav->sched) { 2869 bzero(sav->sched, sav->schedlen); 2870 free(sav->sched, M_IPSEC_MISC); 2871 sav->sched = NULL; 2872 } 2873 if (sav->replay != NULL) { 2874 free(sav->replay, M_IPSEC_MISC); 2875 sav->replay = NULL; 2876 } 2877 if (sav->lft_c != NULL) { 2878 free(sav->lft_c, M_IPSEC_MISC); 2879 sav->lft_c = NULL; 2880 } 2881 if (sav->lft_h != NULL) { 2882 free(sav->lft_h, M_IPSEC_MISC); 2883 sav->lft_h = NULL; 2884 } 2885 if (sav->lft_s != NULL) { 2886 free(sav->lft_s, M_IPSEC_MISC); 2887 sav->lft_s = NULL; 2888 } 2889} 2890 2891/* 2892 * free() SA variable entry. 2893 */ 2894static void 2895key_delsav(struct secasvar *sav) 2896{ 2897 IPSEC_ASSERT(sav != NULL, ("null sav")); 2898 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2899 2900 /* remove from SA header */ 2901 if (__LIST_CHAINED(sav)) 2902 LIST_REMOVE(sav, chain); 2903 key_cleansav(sav); 2904 SECASVAR_LOCK_DESTROY(sav); 2905 free(sav, M_IPSEC_SA); 2906} 2907 2908/* 2909 * search SAD. 2910 * OUT: 2911 * NULL : not found 2912 * others : found, pointer to a SA. 2913 */ 2914static struct secashead * 2915key_getsah(struct secasindex *saidx) 2916{ 2917 struct secashead *sah; 2918 2919 SAHTREE_LOCK(); 2920 LIST_FOREACH(sah, &V_sahtree, chain) { 2921 if (sah->state == SADB_SASTATE_DEAD) 2922 continue; 2923 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2924 break; 2925 } 2926 SAHTREE_UNLOCK(); 2927 2928 return sah; 2929} 2930 2931/* 2932 * check not to be duplicated SPI. 2933 * NOTE: this function is too slow due to searching all SAD. 2934 * OUT: 2935 * NULL : not found 2936 * others : found, pointer to a SA. 2937 */ 2938static struct secasvar * 2939key_checkspidup(struct secasindex *saidx, u_int32_t spi) 2940{ 2941 struct secashead *sah; 2942 struct secasvar *sav; 2943 2944 /* check address family */ 2945 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2946 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2947 __func__)); 2948 return NULL; 2949 } 2950 2951 sav = NULL; 2952 /* check all SAD */ 2953 SAHTREE_LOCK(); 2954 LIST_FOREACH(sah, &V_sahtree, chain) { 2955 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2956 continue; 2957 sav = key_getsavbyspi(sah, spi); 2958 if (sav != NULL) 2959 break; 2960 } 2961 SAHTREE_UNLOCK(); 2962 2963 return sav; 2964} 2965 2966/* 2967 * search SAD litmited alive SA, protocol, SPI. 2968 * OUT: 2969 * NULL : not found 2970 * others : found, pointer to a SA. 2971 */ 2972static struct secasvar * 2973key_getsavbyspi(struct secashead *sah, u_int32_t spi) 2974{ 2975 struct secasvar *sav; 2976 u_int stateidx, state; 2977 2978 sav = NULL; 2979 SAHTREE_LOCK_ASSERT(); 2980 /* search all status */ 2981 for (stateidx = 0; 2982 stateidx < _ARRAYLEN(saorder_state_alive); 2983 stateidx++) { 2984 2985 state = saorder_state_alive[stateidx]; 2986 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2987 2988 /* sanity check */ 2989 if (sav->state != state) { 2990 ipseclog((LOG_DEBUG, "%s: " 2991 "invalid sav->state (queue: %d SA: %d)\n", 2992 __func__, state, sav->state)); 2993 continue; 2994 } 2995 2996 if (sav->spi == spi) 2997 return sav; 2998 } 2999 } 3000 3001 return NULL; 3002} 3003 3004/* 3005 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3006 * You must update these if need. 3007 * OUT: 0: success. 3008 * !0: failure. 3009 * 3010 * does not modify mbuf. does not free mbuf on error. 3011 */ 3012static int 3013key_setsaval(struct secasvar *sav, struct mbuf *m, 3014 const struct sadb_msghdr *mhp) 3015{ 3016 int error = 0; 3017 3018 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3019 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3020 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3021 3022 /* initialization */ 3023 sav->replay = NULL; 3024 sav->key_auth = NULL; 3025 sav->key_enc = NULL; 3026 sav->sched = NULL; 3027 sav->schedlen = 0; 3028 sav->iv = NULL; 3029 sav->lft_c = NULL; 3030 sav->lft_h = NULL; 3031 sav->lft_s = NULL; 3032 sav->tdb_xform = NULL; /* transform */ 3033 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3034 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3035 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3036 /* Initialize even if NAT-T not compiled in: */ 3037 sav->natt_type = 0; 3038 sav->natt_esp_frag_len = 0; 3039 3040 /* SA */ 3041 if (mhp->ext[SADB_EXT_SA] != NULL) { 3042 const struct sadb_sa *sa0; 3043 3044 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3045 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3046 error = EINVAL; 3047 goto fail; 3048 } 3049 3050 sav->alg_auth = sa0->sadb_sa_auth; 3051 sav->alg_enc = sa0->sadb_sa_encrypt; 3052 sav->flags = sa0->sadb_sa_flags; 3053 3054 /* replay window */ 3055 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3056 sav->replay = (struct secreplay *) 3057 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3058 if (sav->replay == NULL) { 3059 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3060 __func__)); 3061 error = ENOBUFS; 3062 goto fail; 3063 } 3064 if (sa0->sadb_sa_replay != 0) 3065 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3066 sav->replay->wsize = sa0->sadb_sa_replay; 3067 } 3068 } 3069 3070 /* Authentication keys */ 3071 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3072 const struct sadb_key *key0; 3073 int len; 3074 3075 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3076 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3077 3078 error = 0; 3079 if (len < sizeof(*key0)) { 3080 error = EINVAL; 3081 goto fail; 3082 } 3083 switch (mhp->msg->sadb_msg_satype) { 3084 case SADB_SATYPE_AH: 3085 case SADB_SATYPE_ESP: 3086 case SADB_X_SATYPE_TCPSIGNATURE: 3087 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3088 sav->alg_auth != SADB_X_AALG_NULL) 3089 error = EINVAL; 3090 break; 3091 case SADB_X_SATYPE_IPCOMP: 3092 default: 3093 error = EINVAL; 3094 break; 3095 } 3096 if (error) { 3097 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3098 __func__)); 3099 goto fail; 3100 } 3101 3102 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3103 M_IPSEC_MISC); 3104 if (sav->key_auth == NULL ) { 3105 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3106 __func__)); 3107 error = ENOBUFS; 3108 goto fail; 3109 } 3110 } 3111 3112 /* Encryption key */ 3113 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3114 const struct sadb_key *key0; 3115 int len; 3116 3117 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3118 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3119 3120 error = 0; 3121 if (len < sizeof(*key0)) { 3122 error = EINVAL; 3123 goto fail; 3124 } 3125 switch (mhp->msg->sadb_msg_satype) { 3126 case SADB_SATYPE_ESP: 3127 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3128 sav->alg_enc != SADB_EALG_NULL) { 3129 error = EINVAL; 3130 break; 3131 } 3132 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3133 len, 3134 M_IPSEC_MISC); 3135 if (sav->key_enc == NULL) { 3136 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3137 __func__)); 3138 error = ENOBUFS; 3139 goto fail; 3140 } 3141 break; 3142 case SADB_X_SATYPE_IPCOMP: 3143 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3144 error = EINVAL; 3145 sav->key_enc = NULL; /*just in case*/ 3146 break; 3147 case SADB_SATYPE_AH: 3148 case SADB_X_SATYPE_TCPSIGNATURE: 3149 default: 3150 error = EINVAL; 3151 break; 3152 } 3153 if (error) { 3154 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3155 __func__)); 3156 goto fail; 3157 } 3158 } 3159 3160 /* set iv */ 3161 sav->ivlen = 0; 3162 3163 switch (mhp->msg->sadb_msg_satype) { 3164 case SADB_SATYPE_AH: 3165 error = xform_init(sav, XF_AH); 3166 break; 3167 case SADB_SATYPE_ESP: 3168 error = xform_init(sav, XF_ESP); 3169 break; 3170 case SADB_X_SATYPE_IPCOMP: 3171 error = xform_init(sav, XF_IPCOMP); 3172 break; 3173 case SADB_X_SATYPE_TCPSIGNATURE: 3174 error = xform_init(sav, XF_TCPSIGNATURE); 3175 break; 3176 } 3177 if (error) { 3178 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3179 __func__, mhp->msg->sadb_msg_satype)); 3180 goto fail; 3181 } 3182 3183 /* reset created */ 3184 sav->created = time_second; 3185 3186 /* make lifetime for CURRENT */ 3187 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3188 if (sav->lft_c == NULL) { 3189 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3190 error = ENOBUFS; 3191 goto fail; 3192 } 3193 3194 sav->lft_c->allocations = 0; 3195 sav->lft_c->bytes = 0; 3196 sav->lft_c->addtime = time_second; 3197 sav->lft_c->usetime = 0; 3198 3199 /* lifetimes for HARD and SOFT */ 3200 { 3201 const struct sadb_lifetime *lft0; 3202 3203 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3204 if (lft0 != NULL) { 3205 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3206 error = EINVAL; 3207 goto fail; 3208 } 3209 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3210 if (sav->lft_h == NULL) { 3211 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3212 error = ENOBUFS; 3213 goto fail; 3214 } 3215 /* to be initialize ? */ 3216 } 3217 3218 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3219 if (lft0 != NULL) { 3220 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3221 error = EINVAL; 3222 goto fail; 3223 } 3224 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3225 if (sav->lft_s == NULL) { 3226 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3227 error = ENOBUFS; 3228 goto fail; 3229 } 3230 /* to be initialize ? */ 3231 } 3232 } 3233 3234 return 0; 3235 3236 fail: 3237 /* initialization */ 3238 key_cleansav(sav); 3239 3240 return error; 3241} 3242 3243/* 3244 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3245 * OUT: 0: valid 3246 * other: errno 3247 */ 3248static int 3249key_mature(struct secasvar *sav) 3250{ 3251 int error; 3252 3253 /* check SPI value */ 3254 switch (sav->sah->saidx.proto) { 3255 case IPPROTO_ESP: 3256 case IPPROTO_AH: 3257 /* 3258 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3259 * 1-255 reserved by IANA for future use, 3260 * 0 for implementation specific, local use. 3261 */ 3262 if (ntohl(sav->spi) <= 255) { 3263 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3264 __func__, (u_int32_t)ntohl(sav->spi))); 3265 return EINVAL; 3266 } 3267 break; 3268 } 3269 3270 /* check satype */ 3271 switch (sav->sah->saidx.proto) { 3272 case IPPROTO_ESP: 3273 /* check flags */ 3274 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3275 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3276 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3277 "given to old-esp.\n", __func__)); 3278 return EINVAL; 3279 } 3280 error = xform_init(sav, XF_ESP); 3281 break; 3282 case IPPROTO_AH: 3283 /* check flags */ 3284 if (sav->flags & SADB_X_EXT_DERIV) { 3285 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3286 "given to AH SA.\n", __func__)); 3287 return EINVAL; 3288 } 3289 if (sav->alg_enc != SADB_EALG_NONE) { 3290 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3291 "mismated.\n", __func__)); 3292 return(EINVAL); 3293 } 3294 error = xform_init(sav, XF_AH); 3295 break; 3296 case IPPROTO_IPCOMP: 3297 if (sav->alg_auth != SADB_AALG_NONE) { 3298 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3299 "mismated.\n", __func__)); 3300 return(EINVAL); 3301 } 3302 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3303 && ntohl(sav->spi) >= 0x10000) { 3304 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3305 __func__)); 3306 return(EINVAL); 3307 } 3308 error = xform_init(sav, XF_IPCOMP); 3309 break; 3310 case IPPROTO_TCP: 3311 if (sav->alg_enc != SADB_EALG_NONE) { 3312 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3313 "mismated.\n", __func__)); 3314 return(EINVAL); 3315 } 3316 error = xform_init(sav, XF_TCPSIGNATURE); 3317 break; 3318 default: 3319 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3320 error = EPROTONOSUPPORT; 3321 break; 3322 } 3323 if (error == 0) { 3324 SAHTREE_LOCK(); 3325 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3326 SAHTREE_UNLOCK(); 3327 } 3328 return (error); 3329} 3330 3331/* 3332 * subroutine for SADB_GET and SADB_DUMP. 3333 */ 3334static struct mbuf * 3335key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3336 u_int32_t seq, u_int32_t pid) 3337{ 3338 struct mbuf *result = NULL, *tres = NULL, *m; 3339 int i; 3340 int dumporder[] = { 3341 SADB_EXT_SA, SADB_X_EXT_SA2, 3342 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3343 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3344 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3345 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3346 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3347#ifdef IPSEC_NAT_T 3348 SADB_X_EXT_NAT_T_TYPE, 3349 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3350 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3351 SADB_X_EXT_NAT_T_FRAG, 3352#endif 3353 }; 3354 3355 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3356 if (m == NULL) 3357 goto fail; 3358 result = m; 3359 3360 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3361 m = NULL; 3362 switch (dumporder[i]) { 3363 case SADB_EXT_SA: 3364 m = key_setsadbsa(sav); 3365 if (!m) 3366 goto fail; 3367 break; 3368 3369 case SADB_X_EXT_SA2: 3370 m = key_setsadbxsa2(sav->sah->saidx.mode, 3371 sav->replay ? sav->replay->count : 0, 3372 sav->sah->saidx.reqid); 3373 if (!m) 3374 goto fail; 3375 break; 3376 3377 case SADB_EXT_ADDRESS_SRC: 3378 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3379 &sav->sah->saidx.src.sa, 3380 FULLMASK, IPSEC_ULPROTO_ANY); 3381 if (!m) 3382 goto fail; 3383 break; 3384 3385 case SADB_EXT_ADDRESS_DST: 3386 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3387 &sav->sah->saidx.dst.sa, 3388 FULLMASK, IPSEC_ULPROTO_ANY); 3389 if (!m) 3390 goto fail; 3391 break; 3392 3393 case SADB_EXT_KEY_AUTH: 3394 if (!sav->key_auth) 3395 continue; 3396 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3397 if (!m) 3398 goto fail; 3399 break; 3400 3401 case SADB_EXT_KEY_ENCRYPT: 3402 if (!sav->key_enc) 3403 continue; 3404 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3405 if (!m) 3406 goto fail; 3407 break; 3408 3409 case SADB_EXT_LIFETIME_CURRENT: 3410 if (!sav->lft_c) 3411 continue; 3412 m = key_setlifetime(sav->lft_c, 3413 SADB_EXT_LIFETIME_CURRENT); 3414 if (!m) 3415 goto fail; 3416 break; 3417 3418 case SADB_EXT_LIFETIME_HARD: 3419 if (!sav->lft_h) 3420 continue; 3421 m = key_setlifetime(sav->lft_h, 3422 SADB_EXT_LIFETIME_HARD); 3423 if (!m) 3424 goto fail; 3425 break; 3426 3427 case SADB_EXT_LIFETIME_SOFT: 3428 if (!sav->lft_s) 3429 continue; 3430 m = key_setlifetime(sav->lft_s, 3431 SADB_EXT_LIFETIME_SOFT); 3432 3433 if (!m) 3434 goto fail; 3435 break; 3436 3437#ifdef IPSEC_NAT_T 3438 case SADB_X_EXT_NAT_T_TYPE: 3439 m = key_setsadbxtype(sav->natt_type); 3440 if (!m) 3441 goto fail; 3442 break; 3443 3444 case SADB_X_EXT_NAT_T_DPORT: 3445 m = key_setsadbxport( 3446 KEY_PORTFROMSADDR(&sav->sah->saidx.dst), 3447 SADB_X_EXT_NAT_T_DPORT); 3448 if (!m) 3449 goto fail; 3450 break; 3451 3452 case SADB_X_EXT_NAT_T_SPORT: 3453 m = key_setsadbxport( 3454 KEY_PORTFROMSADDR(&sav->sah->saidx.src), 3455 SADB_X_EXT_NAT_T_SPORT); 3456 if (!m) 3457 goto fail; 3458 break; 3459 3460 case SADB_X_EXT_NAT_T_OAI: 3461 case SADB_X_EXT_NAT_T_OAR: 3462 case SADB_X_EXT_NAT_T_FRAG: 3463 /* We do not (yet) support those. */ 3464 continue; 3465#endif 3466 3467 case SADB_EXT_ADDRESS_PROXY: 3468 case SADB_EXT_IDENTITY_SRC: 3469 case SADB_EXT_IDENTITY_DST: 3470 /* XXX: should we brought from SPD ? */ 3471 case SADB_EXT_SENSITIVITY: 3472 default: 3473 continue; 3474 } 3475 3476 if (!m) 3477 goto fail; 3478 if (tres) 3479 m_cat(m, tres); 3480 tres = m; 3481 3482 } 3483 3484 m_cat(result, tres); 3485 if (result->m_len < sizeof(struct sadb_msg)) { 3486 result = m_pullup(result, sizeof(struct sadb_msg)); 3487 if (result == NULL) 3488 goto fail; 3489 } 3490 3491 result->m_pkthdr.len = 0; 3492 for (m = result; m; m = m->m_next) 3493 result->m_pkthdr.len += m->m_len; 3494 3495 mtod(result, struct sadb_msg *)->sadb_msg_len = 3496 PFKEY_UNIT64(result->m_pkthdr.len); 3497 3498 return result; 3499 3500fail: 3501 m_freem(result); 3502 m_freem(tres); 3503 return NULL; 3504} 3505 3506/* 3507 * set data into sadb_msg. 3508 */ 3509static struct mbuf * 3510key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3511 pid_t pid, u_int16_t reserved) 3512{ 3513 struct mbuf *m; 3514 struct sadb_msg *p; 3515 int len; 3516 3517 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3518 if (len > MCLBYTES) 3519 return NULL; 3520 MGETHDR(m, M_NOWAIT, MT_DATA); 3521 if (m && len > MHLEN) { 3522 MCLGET(m, M_NOWAIT); 3523 if ((m->m_flags & M_EXT) == 0) { 3524 m_freem(m); 3525 m = NULL; 3526 } 3527 } 3528 if (!m) 3529 return NULL; 3530 m->m_pkthdr.len = m->m_len = len; 3531 m->m_next = NULL; 3532 3533 p = mtod(m, struct sadb_msg *); 3534 3535 bzero(p, len); 3536 p->sadb_msg_version = PF_KEY_V2; 3537 p->sadb_msg_type = type; 3538 p->sadb_msg_errno = 0; 3539 p->sadb_msg_satype = satype; 3540 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3541 p->sadb_msg_reserved = reserved; 3542 p->sadb_msg_seq = seq; 3543 p->sadb_msg_pid = (u_int32_t)pid; 3544 3545 return m; 3546} 3547 3548/* 3549 * copy secasvar data into sadb_address. 3550 */ 3551static struct mbuf * 3552key_setsadbsa(struct secasvar *sav) 3553{ 3554 struct mbuf *m; 3555 struct sadb_sa *p; 3556 int len; 3557 3558 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3559 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3560 if (m == NULL) 3561 return (NULL); 3562 m_align(m, len); 3563 m->m_len = len; 3564 p = mtod(m, struct sadb_sa *); 3565 bzero(p, len); 3566 p->sadb_sa_len = PFKEY_UNIT64(len); 3567 p->sadb_sa_exttype = SADB_EXT_SA; 3568 p->sadb_sa_spi = sav->spi; 3569 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3570 p->sadb_sa_state = sav->state; 3571 p->sadb_sa_auth = sav->alg_auth; 3572 p->sadb_sa_encrypt = sav->alg_enc; 3573 p->sadb_sa_flags = sav->flags; 3574 3575 return m; 3576} 3577 3578/* 3579 * set data into sadb_address. 3580 */ 3581static struct mbuf * 3582key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, 3583 u_int8_t prefixlen, u_int16_t ul_proto) 3584{ 3585 struct mbuf *m; 3586 struct sadb_address *p; 3587 size_t len; 3588 3589 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3590 PFKEY_ALIGN8(saddr->sa_len); 3591 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3592 if (m == NULL) 3593 return (NULL); 3594 m_align(m, len); 3595 m->m_len = len; 3596 p = mtod(m, struct sadb_address *); 3597 3598 bzero(p, len); 3599 p->sadb_address_len = PFKEY_UNIT64(len); 3600 p->sadb_address_exttype = exttype; 3601 p->sadb_address_proto = ul_proto; 3602 if (prefixlen == FULLMASK) { 3603 switch (saddr->sa_family) { 3604 case AF_INET: 3605 prefixlen = sizeof(struct in_addr) << 3; 3606 break; 3607 case AF_INET6: 3608 prefixlen = sizeof(struct in6_addr) << 3; 3609 break; 3610 default: 3611 ; /*XXX*/ 3612 } 3613 } 3614 p->sadb_address_prefixlen = prefixlen; 3615 p->sadb_address_reserved = 0; 3616 3617 bcopy(saddr, 3618 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3619 saddr->sa_len); 3620 3621 return m; 3622} 3623 3624/* 3625 * set data into sadb_x_sa2. 3626 */ 3627static struct mbuf * 3628key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3629{ 3630 struct mbuf *m; 3631 struct sadb_x_sa2 *p; 3632 size_t len; 3633 3634 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3635 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3636 if (m == NULL) 3637 return (NULL); 3638 m_align(m, len); 3639 m->m_len = len; 3640 p = mtod(m, struct sadb_x_sa2 *); 3641 3642 bzero(p, len); 3643 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3644 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3645 p->sadb_x_sa2_mode = mode; 3646 p->sadb_x_sa2_reserved1 = 0; 3647 p->sadb_x_sa2_reserved2 = 0; 3648 p->sadb_x_sa2_sequence = seq; 3649 p->sadb_x_sa2_reqid = reqid; 3650 3651 return m; 3652} 3653 3654#ifdef IPSEC_NAT_T 3655/* 3656 * Set a type in sadb_x_nat_t_type. 3657 */ 3658static struct mbuf * 3659key_setsadbxtype(u_int16_t type) 3660{ 3661 struct mbuf *m; 3662 size_t len; 3663 struct sadb_x_nat_t_type *p; 3664 3665 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3666 3667 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3668 if (m == NULL) 3669 return (NULL); 3670 m_align(m, len); 3671 m->m_len = len; 3672 p = mtod(m, struct sadb_x_nat_t_type *); 3673 3674 bzero(p, len); 3675 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3676 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3677 p->sadb_x_nat_t_type_type = type; 3678 3679 return (m); 3680} 3681/* 3682 * Set a port in sadb_x_nat_t_port. 3683 * In contrast to default RFC 2367 behaviour, port is in network byte order. 3684 */ 3685static struct mbuf * 3686key_setsadbxport(u_int16_t port, u_int16_t type) 3687{ 3688 struct mbuf *m; 3689 size_t len; 3690 struct sadb_x_nat_t_port *p; 3691 3692 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3693 3694 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3695 if (m == NULL) 3696 return (NULL); 3697 m_align(m, len); 3698 m->m_len = len; 3699 p = mtod(m, struct sadb_x_nat_t_port *); 3700 3701 bzero(p, len); 3702 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3703 p->sadb_x_nat_t_port_exttype = type; 3704 p->sadb_x_nat_t_port_port = port; 3705 3706 return (m); 3707} 3708 3709/* 3710 * Get port from sockaddr. Port is in network byte order. 3711 */ 3712u_int16_t 3713key_portfromsaddr(struct sockaddr *sa) 3714{ 3715 3716 switch (sa->sa_family) { 3717#ifdef INET 3718 case AF_INET: 3719 return ((struct sockaddr_in *)sa)->sin_port; 3720#endif 3721#ifdef INET6 3722 case AF_INET6: 3723 return ((struct sockaddr_in6 *)sa)->sin6_port; 3724#endif 3725 } 3726 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 3727 printf("DP %s unexpected address family %d\n", 3728 __func__, sa->sa_family)); 3729 return (0); 3730} 3731#endif /* IPSEC_NAT_T */ 3732 3733/* 3734 * Set port in struct sockaddr. Port is in network byte order. 3735 */ 3736static void 3737key_porttosaddr(struct sockaddr *sa, u_int16_t port) 3738{ 3739 3740 switch (sa->sa_family) { 3741#ifdef INET 3742 case AF_INET: 3743 ((struct sockaddr_in *)sa)->sin_port = port; 3744 break; 3745#endif 3746#ifdef INET6 3747 case AF_INET6: 3748 ((struct sockaddr_in6 *)sa)->sin6_port = port; 3749 break; 3750#endif 3751 default: 3752 ipseclog((LOG_DEBUG, "%s: unexpected address family %d.\n", 3753 __func__, sa->sa_family)); 3754 break; 3755 } 3756} 3757 3758/* 3759 * set data into sadb_x_policy 3760 */ 3761static struct mbuf * 3762key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3763{ 3764 struct mbuf *m; 3765 struct sadb_x_policy *p; 3766 size_t len; 3767 3768 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3769 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 3770 if (m == NULL) 3771 return (NULL); 3772 m_align(m, len); 3773 m->m_len = len; 3774 p = mtod(m, struct sadb_x_policy *); 3775 3776 bzero(p, len); 3777 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3778 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3779 p->sadb_x_policy_type = type; 3780 p->sadb_x_policy_dir = dir; 3781 p->sadb_x_policy_id = id; 3782 3783 return m; 3784} 3785 3786/* %%% utilities */ 3787/* Take a key message (sadb_key) from the socket and turn it into one 3788 * of the kernel's key structures (seckey). 3789 * 3790 * IN: pointer to the src 3791 * OUT: NULL no more memory 3792 */ 3793struct seckey * 3794key_dup_keymsg(const struct sadb_key *src, u_int len, 3795 struct malloc_type *type) 3796{ 3797 struct seckey *dst; 3798 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3799 if (dst != NULL) { 3800 dst->bits = src->sadb_key_bits; 3801 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3802 if (dst->key_data != NULL) { 3803 bcopy((const char *)src + sizeof(struct sadb_key), 3804 dst->key_data, len); 3805 } else { 3806 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3807 __func__)); 3808 free(dst, type); 3809 dst = NULL; 3810 } 3811 } else { 3812 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3813 __func__)); 3814 3815 } 3816 return dst; 3817} 3818 3819/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3820 * turn it into one of the kernel's lifetime structures (seclifetime). 3821 * 3822 * IN: pointer to the destination, source and malloc type 3823 * OUT: NULL, no more memory 3824 */ 3825 3826static struct seclifetime * 3827key_dup_lifemsg(const struct sadb_lifetime *src, struct malloc_type *type) 3828{ 3829 struct seclifetime *dst = NULL; 3830 3831 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3832 type, M_NOWAIT); 3833 if (dst == NULL) { 3834 /* XXX counter */ 3835 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3836 } else { 3837 dst->allocations = src->sadb_lifetime_allocations; 3838 dst->bytes = src->sadb_lifetime_bytes; 3839 dst->addtime = src->sadb_lifetime_addtime; 3840 dst->usetime = src->sadb_lifetime_usetime; 3841 } 3842 return dst; 3843} 3844 3845/* compare my own address 3846 * OUT: 1: true, i.e. my address. 3847 * 0: false 3848 */ 3849int 3850key_ismyaddr(struct sockaddr *sa) 3851{ 3852 3853 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3854 switch (sa->sa_family) { 3855#ifdef INET 3856 case AF_INET: 3857 return (in_localip(satosin(sa)->sin_addr)); 3858#endif 3859#ifdef INET6 3860 case AF_INET6: 3861 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3862#endif 3863 } 3864 3865 return 0; 3866} 3867 3868#ifdef INET6 3869/* 3870 * compare my own address for IPv6. 3871 * 1: ours 3872 * 0: other 3873 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3874 */ 3875#include <netinet6/in6_var.h> 3876 3877static int 3878key_ismyaddr6(struct sockaddr_in6 *sin6) 3879{ 3880 struct in6_ifaddr *ia; 3881#if 0 3882 struct in6_multi *in6m; 3883#endif 3884 3885 IN6_IFADDR_RLOCK(); 3886 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) { 3887 if (key_sockaddrcmp((struct sockaddr *)sin6, 3888 (struct sockaddr *)&ia->ia_addr, 0) == 0) { 3889 IN6_IFADDR_RUNLOCK(); 3890 return 1; 3891 } 3892 3893#if 0 3894 /* 3895 * XXX Multicast 3896 * XXX why do we care about multlicast here while we don't care 3897 * about IPv4 multicast?? 3898 * XXX scope 3899 */ 3900 in6m = NULL; 3901 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3902 if (in6m) { 3903 IN6_IFADDR_RUNLOCK(); 3904 return 1; 3905 } 3906#endif 3907 } 3908 IN6_IFADDR_RUNLOCK(); 3909 3910 /* loopback, just for safety */ 3911 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3912 return 1; 3913 3914 return 0; 3915} 3916#endif /*INET6*/ 3917 3918/* 3919 * compare two secasindex structure. 3920 * flag can specify to compare 2 saidxes. 3921 * compare two secasindex structure without both mode and reqid. 3922 * don't compare port. 3923 * IN: 3924 * saidx0: source, it can be in SAD. 3925 * saidx1: object. 3926 * OUT: 3927 * 1 : equal 3928 * 0 : not equal 3929 */ 3930static int 3931key_cmpsaidx(const struct secasindex *saidx0, const struct secasindex *saidx1, 3932 int flag) 3933{ 3934 int chkport = 0; 3935 3936 /* sanity */ 3937 if (saidx0 == NULL && saidx1 == NULL) 3938 return 1; 3939 3940 if (saidx0 == NULL || saidx1 == NULL) 3941 return 0; 3942 3943 if (saidx0->proto != saidx1->proto) 3944 return 0; 3945 3946 if (flag == CMP_EXACTLY) { 3947 if (saidx0->mode != saidx1->mode) 3948 return 0; 3949 if (saidx0->reqid != saidx1->reqid) 3950 return 0; 3951 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3952 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3953 return 0; 3954 } else { 3955 3956 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3957 if (flag == CMP_MODE_REQID 3958 ||flag == CMP_REQID) { 3959 /* 3960 * If reqid of SPD is non-zero, unique SA is required. 3961 * The result must be of same reqid in this case. 3962 */ 3963 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3964 return 0; 3965 } 3966 3967 if (flag == CMP_MODE_REQID) { 3968 if (saidx0->mode != IPSEC_MODE_ANY 3969 && saidx0->mode != saidx1->mode) 3970 return 0; 3971 } 3972 3973#ifdef IPSEC_NAT_T 3974 /* 3975 * If NAT-T is enabled, check ports for tunnel mode. 3976 * Do not check ports if they are set to zero in the SPD. 3977 * Also do not do it for native transport mode, as there 3978 * is no port information available in the SP. 3979 */ 3980 if ((saidx1->mode == IPSEC_MODE_TUNNEL || 3981 (saidx1->mode == IPSEC_MODE_TRANSPORT && 3982 saidx1->proto == IPPROTO_ESP)) && 3983 saidx1->src.sa.sa_family == AF_INET && 3984 saidx1->dst.sa.sa_family == AF_INET && 3985 ((const struct sockaddr_in *)(&saidx1->src))->sin_port && 3986 ((const struct sockaddr_in *)(&saidx1->dst))->sin_port) 3987 chkport = 1; 3988#endif /* IPSEC_NAT_T */ 3989 3990 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, chkport) != 0) { 3991 return 0; 3992 } 3993 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, chkport) != 0) { 3994 return 0; 3995 } 3996 } 3997 3998 return 1; 3999} 4000 4001/* 4002 * compare two secindex structure exactly. 4003 * IN: 4004 * spidx0: source, it is often in SPD. 4005 * spidx1: object, it is often from PFKEY message. 4006 * OUT: 4007 * 1 : equal 4008 * 0 : not equal 4009 */ 4010static int 4011key_cmpspidx_exactly(struct secpolicyindex *spidx0, 4012 struct secpolicyindex *spidx1) 4013{ 4014 /* sanity */ 4015 if (spidx0 == NULL && spidx1 == NULL) 4016 return 1; 4017 4018 if (spidx0 == NULL || spidx1 == NULL) 4019 return 0; 4020 4021 if (spidx0->prefs != spidx1->prefs 4022 || spidx0->prefd != spidx1->prefd 4023 || spidx0->ul_proto != spidx1->ul_proto) 4024 return 0; 4025 4026 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 4027 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 4028} 4029 4030/* 4031 * compare two secindex structure with mask. 4032 * IN: 4033 * spidx0: source, it is often in SPD. 4034 * spidx1: object, it is often from IP header. 4035 * OUT: 4036 * 1 : equal 4037 * 0 : not equal 4038 */ 4039static int 4040key_cmpspidx_withmask(struct secpolicyindex *spidx0, 4041 struct secpolicyindex *spidx1) 4042{ 4043 /* sanity */ 4044 if (spidx0 == NULL && spidx1 == NULL) 4045 return 1; 4046 4047 if (spidx0 == NULL || spidx1 == NULL) 4048 return 0; 4049 4050 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4051 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4052 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4053 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4054 return 0; 4055 4056 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4057 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 4058 && spidx0->ul_proto != spidx1->ul_proto) 4059 return 0; 4060 4061 switch (spidx0->src.sa.sa_family) { 4062 case AF_INET: 4063 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 4064 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4065 return 0; 4066 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 4067 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4068 return 0; 4069 break; 4070 case AF_INET6: 4071 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 4072 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4073 return 0; 4074 /* 4075 * scope_id check. if sin6_scope_id is 0, we regard it 4076 * as a wildcard scope, which matches any scope zone ID. 4077 */ 4078 if (spidx0->src.sin6.sin6_scope_id && 4079 spidx1->src.sin6.sin6_scope_id && 4080 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4081 return 0; 4082 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 4083 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4084 return 0; 4085 break; 4086 default: 4087 /* XXX */ 4088 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4089 return 0; 4090 break; 4091 } 4092 4093 switch (spidx0->dst.sa.sa_family) { 4094 case AF_INET: 4095 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 4096 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4097 return 0; 4098 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 4099 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4100 return 0; 4101 break; 4102 case AF_INET6: 4103 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 4104 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4105 return 0; 4106 /* 4107 * scope_id check. if sin6_scope_id is 0, we regard it 4108 * as a wildcard scope, which matches any scope zone ID. 4109 */ 4110 if (spidx0->dst.sin6.sin6_scope_id && 4111 spidx1->dst.sin6.sin6_scope_id && 4112 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4113 return 0; 4114 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 4115 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4116 return 0; 4117 break; 4118 default: 4119 /* XXX */ 4120 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4121 return 0; 4122 break; 4123 } 4124 4125 /* XXX Do we check other field ? e.g. flowinfo */ 4126 4127 return 1; 4128} 4129 4130/* returns 0 on match */ 4131static int 4132key_sockaddrcmp(const struct sockaddr *sa1, const struct sockaddr *sa2, 4133 int port) 4134{ 4135#ifdef satosin 4136#undef satosin 4137#endif 4138#define satosin(s) ((const struct sockaddr_in *)s) 4139#ifdef satosin6 4140#undef satosin6 4141#endif 4142#define satosin6(s) ((const struct sockaddr_in6 *)s) 4143 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4144 return 1; 4145 4146 switch (sa1->sa_family) { 4147 case AF_INET: 4148 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4149 return 1; 4150 if (satosin(sa1)->sin_addr.s_addr != 4151 satosin(sa2)->sin_addr.s_addr) { 4152 return 1; 4153 } 4154 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4155 return 1; 4156 break; 4157 case AF_INET6: 4158 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4159 return 1; /*EINVAL*/ 4160 if (satosin6(sa1)->sin6_scope_id != 4161 satosin6(sa2)->sin6_scope_id) { 4162 return 1; 4163 } 4164 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4165 &satosin6(sa2)->sin6_addr)) { 4166 return 1; 4167 } 4168 if (port && 4169 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4170 return 1; 4171 } 4172 break; 4173 default: 4174 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4175 return 1; 4176 break; 4177 } 4178 4179 return 0; 4180#undef satosin 4181#undef satosin6 4182} 4183 4184/* 4185 * compare two buffers with mask. 4186 * IN: 4187 * addr1: source 4188 * addr2: object 4189 * bits: Number of bits to compare 4190 * OUT: 4191 * 1 : equal 4192 * 0 : not equal 4193 */ 4194static int 4195key_bbcmp(const void *a1, const void *a2, u_int bits) 4196{ 4197 const unsigned char *p1 = a1; 4198 const unsigned char *p2 = a2; 4199 4200 /* XXX: This could be considerably faster if we compare a word 4201 * at a time, but it is complicated on LSB Endian machines */ 4202 4203 /* Handle null pointers */ 4204 if (p1 == NULL || p2 == NULL) 4205 return (p1 == p2); 4206 4207 while (bits >= 8) { 4208 if (*p1++ != *p2++) 4209 return 0; 4210 bits -= 8; 4211 } 4212 4213 if (bits > 0) { 4214 u_int8_t mask = ~((1<<(8-bits))-1); 4215 if ((*p1 & mask) != (*p2 & mask)) 4216 return 0; 4217 } 4218 return 1; /* Match! */ 4219} 4220 4221static void 4222key_flush_spd(time_t now) 4223{ 4224 static u_int16_t sptree_scangen = 0; 4225 u_int16_t gen = sptree_scangen++; 4226 struct secpolicy *sp; 4227 u_int dir; 4228 4229 /* SPD */ 4230 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4231restart: 4232 SPTREE_LOCK(); 4233 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4234 if (sp->scangen == gen) /* previously handled */ 4235 continue; 4236 sp->scangen = gen; 4237 if (sp->state == IPSEC_SPSTATE_DEAD && 4238 sp->refcnt == 1) { 4239 /* 4240 * Ensure that we only decrease refcnt once, 4241 * when we're the last consumer. 4242 * Directly call SP_DELREF/key_delsp instead 4243 * of KEY_FREESP to avoid unlocking/relocking 4244 * SPTREE_LOCK before key_delsp: may refcnt 4245 * be increased again during that time ? 4246 * NB: also clean entries created by 4247 * key_spdflush 4248 */ 4249 SP_DELREF(sp); 4250 key_delsp(sp); 4251 SPTREE_UNLOCK(); 4252 goto restart; 4253 } 4254 if (sp->lifetime == 0 && sp->validtime == 0) 4255 continue; 4256 if ((sp->lifetime && now - sp->created > sp->lifetime) 4257 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4258 sp->state = IPSEC_SPSTATE_DEAD; 4259 SPTREE_UNLOCK(); 4260 key_spdexpire(sp); 4261 goto restart; 4262 } 4263 } 4264 SPTREE_UNLOCK(); 4265 } 4266} 4267 4268static void 4269key_flush_sad(time_t now) 4270{ 4271 struct secashead *sah, *nextsah; 4272 struct secasvar *sav, *nextsav; 4273 4274 /* SAD */ 4275 SAHTREE_LOCK(); 4276 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4277 /* if sah has been dead, then delete it and process next sah. */ 4278 if (sah->state == SADB_SASTATE_DEAD) { 4279 key_delsah(sah); 4280 continue; 4281 } 4282 4283 /* if LARVAL entry doesn't become MATURE, delete it. */ 4284 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4285 /* Need to also check refcnt for a larval SA ??? */ 4286 if (now - sav->created > V_key_larval_lifetime) 4287 KEY_FREESAV(&sav); 4288 } 4289 4290 /* 4291 * check MATURE entry to start to send expire message 4292 * whether or not. 4293 */ 4294 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4295 /* we don't need to check. */ 4296 if (sav->lft_s == NULL) 4297 continue; 4298 4299 /* sanity check */ 4300 if (sav->lft_c == NULL) { 4301 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4302 "time, why?\n", __func__)); 4303 continue; 4304 } 4305 4306 /* check SOFT lifetime */ 4307 if (sav->lft_s->addtime != 0 && 4308 now - sav->created > sav->lft_s->addtime) { 4309 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4310 /* 4311 * Actually, only send expire message if 4312 * SA has been used, as it was done before, 4313 * but should we always send such message, 4314 * and let IKE daemon decide if it should be 4315 * renegotiated or not ? 4316 * XXX expire message will actually NOT be 4317 * sent if SA is only used after soft 4318 * lifetime has been reached, see below 4319 * (DYING state) 4320 */ 4321 if (sav->lft_c->usetime != 0) 4322 key_expire(sav); 4323 } 4324 /* check SOFT lifetime by bytes */ 4325 /* 4326 * XXX I don't know the way to delete this SA 4327 * when new SA is installed. Caution when it's 4328 * installed too big lifetime by time. 4329 */ 4330 else if (sav->lft_s->bytes != 0 && 4331 sav->lft_s->bytes < sav->lft_c->bytes) { 4332 4333 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4334 /* 4335 * XXX If we keep to send expire 4336 * message in the status of 4337 * DYING. Do remove below code. 4338 */ 4339 key_expire(sav); 4340 } 4341 } 4342 4343 /* check DYING entry to change status to DEAD. */ 4344 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4345 /* we don't need to check. */ 4346 if (sav->lft_h == NULL) 4347 continue; 4348 4349 /* sanity check */ 4350 if (sav->lft_c == NULL) { 4351 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4352 "time, why?\n", __func__)); 4353 continue; 4354 } 4355 4356 if (sav->lft_h->addtime != 0 && 4357 now - sav->created > sav->lft_h->addtime) { 4358 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4359 KEY_FREESAV(&sav); 4360 } 4361#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4362 else if (sav->lft_s != NULL 4363 && sav->lft_s->addtime != 0 4364 && now - sav->created > sav->lft_s->addtime) { 4365 /* 4366 * XXX: should be checked to be 4367 * installed the valid SA. 4368 */ 4369 4370 /* 4371 * If there is no SA then sending 4372 * expire message. 4373 */ 4374 key_expire(sav); 4375 } 4376#endif 4377 /* check HARD lifetime by bytes */ 4378 else if (sav->lft_h->bytes != 0 && 4379 sav->lft_h->bytes < sav->lft_c->bytes) { 4380 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4381 KEY_FREESAV(&sav); 4382 } 4383 } 4384 4385 /* delete entry in DEAD */ 4386 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4387 /* sanity check */ 4388 if (sav->state != SADB_SASTATE_DEAD) { 4389 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4390 "(queue: %d SA: %d): kill it anyway\n", 4391 __func__, 4392 SADB_SASTATE_DEAD, sav->state)); 4393 } 4394 /* 4395 * do not call key_freesav() here. 4396 * sav should already be freed, and sav->refcnt 4397 * shows other references to sav 4398 * (such as from SPD). 4399 */ 4400 } 4401 } 4402 SAHTREE_UNLOCK(); 4403} 4404 4405static void 4406key_flush_acq(time_t now) 4407{ 4408 struct secacq *acq, *nextacq; 4409 4410 /* ACQ tree */ 4411 ACQ_LOCK(); 4412 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4413 nextacq = LIST_NEXT(acq, chain); 4414 if (now - acq->created > V_key_blockacq_lifetime 4415 && __LIST_CHAINED(acq)) { 4416 LIST_REMOVE(acq, chain); 4417 free(acq, M_IPSEC_SAQ); 4418 } 4419 } 4420 ACQ_UNLOCK(); 4421} 4422 4423static void 4424key_flush_spacq(time_t now) 4425{ 4426 struct secspacq *acq, *nextacq; 4427 4428 /* SP ACQ tree */ 4429 SPACQ_LOCK(); 4430 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4431 nextacq = LIST_NEXT(acq, chain); 4432 if (now - acq->created > V_key_blockacq_lifetime 4433 && __LIST_CHAINED(acq)) { 4434 LIST_REMOVE(acq, chain); 4435 free(acq, M_IPSEC_SAQ); 4436 } 4437 } 4438 SPACQ_UNLOCK(); 4439} 4440 4441/* 4442 * time handler. 4443 * scanning SPD and SAD to check status for each entries, 4444 * and do to remove or to expire. 4445 * XXX: year 2038 problem may remain. 4446 */ 4447void 4448key_timehandler(void) 4449{ 4450 VNET_ITERATOR_DECL(vnet_iter); 4451 time_t now = time_second; 4452 4453 VNET_LIST_RLOCK_NOSLEEP(); 4454 VNET_FOREACH(vnet_iter) { 4455 CURVNET_SET(vnet_iter); 4456 key_flush_spd(now); 4457 key_flush_sad(now); 4458 key_flush_acq(now); 4459 key_flush_spacq(now); 4460 CURVNET_RESTORE(); 4461 } 4462 VNET_LIST_RUNLOCK_NOSLEEP(); 4463 4464#ifndef IPSEC_DEBUG2 4465 /* do exchange to tick time !! */ 4466 (void)timeout((void *)key_timehandler, (void *)0, hz); 4467#endif /* IPSEC_DEBUG2 */ 4468} 4469 4470u_long 4471key_random() 4472{ 4473 u_long value; 4474 4475 key_randomfill(&value, sizeof(value)); 4476 return value; 4477} 4478 4479void 4480key_randomfill(void *p, size_t l) 4481{ 4482 size_t n; 4483 u_long v; 4484 static int warn = 1; 4485 4486 n = 0; 4487 n = (size_t)read_random(p, (u_int)l); 4488 /* last resort */ 4489 while (n < l) { 4490 v = random(); 4491 bcopy(&v, (u_int8_t *)p + n, 4492 l - n < sizeof(v) ? l - n : sizeof(v)); 4493 n += sizeof(v); 4494 4495 if (warn) { 4496 printf("WARNING: pseudo-random number generator " 4497 "used for IPsec processing\n"); 4498 warn = 0; 4499 } 4500 } 4501} 4502 4503/* 4504 * map SADB_SATYPE_* to IPPROTO_*. 4505 * if satype == SADB_SATYPE then satype is mapped to ~0. 4506 * OUT: 4507 * 0: invalid satype. 4508 */ 4509static u_int16_t 4510key_satype2proto(u_int8_t satype) 4511{ 4512 switch (satype) { 4513 case SADB_SATYPE_UNSPEC: 4514 return IPSEC_PROTO_ANY; 4515 case SADB_SATYPE_AH: 4516 return IPPROTO_AH; 4517 case SADB_SATYPE_ESP: 4518 return IPPROTO_ESP; 4519 case SADB_X_SATYPE_IPCOMP: 4520 return IPPROTO_IPCOMP; 4521 case SADB_X_SATYPE_TCPSIGNATURE: 4522 return IPPROTO_TCP; 4523 default: 4524 return 0; 4525 } 4526 /* NOTREACHED */ 4527} 4528 4529/* 4530 * map IPPROTO_* to SADB_SATYPE_* 4531 * OUT: 4532 * 0: invalid protocol type. 4533 */ 4534static u_int8_t 4535key_proto2satype(u_int16_t proto) 4536{ 4537 switch (proto) { 4538 case IPPROTO_AH: 4539 return SADB_SATYPE_AH; 4540 case IPPROTO_ESP: 4541 return SADB_SATYPE_ESP; 4542 case IPPROTO_IPCOMP: 4543 return SADB_X_SATYPE_IPCOMP; 4544 case IPPROTO_TCP: 4545 return SADB_X_SATYPE_TCPSIGNATURE; 4546 default: 4547 return 0; 4548 } 4549 /* NOTREACHED */ 4550} 4551 4552/* %%% PF_KEY */ 4553/* 4554 * SADB_GETSPI processing is to receive 4555 * <base, (SA2), src address, dst address, (SPI range)> 4556 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4557 * tree with the status of LARVAL, and send 4558 * <base, SA(*), address(SD)> 4559 * to the IKMPd. 4560 * 4561 * IN: mhp: pointer to the pointer to each header. 4562 * OUT: NULL if fail. 4563 * other if success, return pointer to the message to send. 4564 */ 4565static int 4566key_getspi(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4567{ 4568 struct sadb_address *src0, *dst0; 4569 struct secasindex saidx; 4570 struct secashead *newsah; 4571 struct secasvar *newsav; 4572 u_int8_t proto; 4573 u_int32_t spi; 4574 u_int8_t mode; 4575 u_int32_t reqid; 4576 int error; 4577 4578 IPSEC_ASSERT(so != NULL, ("null socket")); 4579 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4580 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4581 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4582 4583 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4584 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4585 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4586 __func__)); 4587 return key_senderror(so, m, EINVAL); 4588 } 4589 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4590 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4591 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4592 __func__)); 4593 return key_senderror(so, m, EINVAL); 4594 } 4595 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4596 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4597 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4598 } else { 4599 mode = IPSEC_MODE_ANY; 4600 reqid = 0; 4601 } 4602 4603 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4604 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4605 4606 /* map satype to proto */ 4607 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4608 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4609 __func__)); 4610 return key_senderror(so, m, EINVAL); 4611 } 4612 4613 /* 4614 * Make sure the port numbers are zero. 4615 * In case of NAT-T we will update them later if needed. 4616 */ 4617 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4618 case AF_INET: 4619 if (((struct sockaddr *)(src0 + 1))->sa_len != 4620 sizeof(struct sockaddr_in)) 4621 return key_senderror(so, m, EINVAL); 4622 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4623 break; 4624 case AF_INET6: 4625 if (((struct sockaddr *)(src0 + 1))->sa_len != 4626 sizeof(struct sockaddr_in6)) 4627 return key_senderror(so, m, EINVAL); 4628 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4629 break; 4630 default: 4631 ; /*???*/ 4632 } 4633 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4634 case AF_INET: 4635 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4636 sizeof(struct sockaddr_in)) 4637 return key_senderror(so, m, EINVAL); 4638 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4639 break; 4640 case AF_INET6: 4641 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4642 sizeof(struct sockaddr_in6)) 4643 return key_senderror(so, m, EINVAL); 4644 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4645 break; 4646 default: 4647 ; /*???*/ 4648 } 4649 4650 /* XXX boundary check against sa_len */ 4651 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4652 4653#ifdef IPSEC_NAT_T 4654 /* 4655 * Handle NAT-T info if present. 4656 * We made sure the port numbers are zero above, so we do 4657 * not have to worry in case we do not update them. 4658 */ 4659 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 4660 ipseclog((LOG_DEBUG, "%s: NAT-T OAi present\n", __func__)); 4661 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 4662 ipseclog((LOG_DEBUG, "%s: NAT-T OAr present\n", __func__)); 4663 4664 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4665 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4666 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4667 struct sadb_x_nat_t_type *type; 4668 struct sadb_x_nat_t_port *sport, *dport; 4669 4670 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4671 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4672 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4673 ipseclog((LOG_DEBUG, "%s: invalid nat-t message " 4674 "passed.\n", __func__)); 4675 return key_senderror(so, m, EINVAL); 4676 } 4677 4678 sport = (struct sadb_x_nat_t_port *) 4679 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4680 dport = (struct sadb_x_nat_t_port *) 4681 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4682 4683 if (sport) 4684 KEY_PORTTOSADDR(&saidx.src, sport->sadb_x_nat_t_port_port); 4685 if (dport) 4686 KEY_PORTTOSADDR(&saidx.dst, dport->sadb_x_nat_t_port_port); 4687 } 4688#endif 4689 4690 /* SPI allocation */ 4691 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4692 &saidx); 4693 if (spi == 0) 4694 return key_senderror(so, m, EINVAL); 4695 4696 /* get a SA index */ 4697 if ((newsah = key_getsah(&saidx)) == NULL) { 4698 /* create a new SA index */ 4699 if ((newsah = key_newsah(&saidx)) == NULL) { 4700 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4701 return key_senderror(so, m, ENOBUFS); 4702 } 4703 } 4704 4705 /* get a new SA */ 4706 /* XXX rewrite */ 4707 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4708 if (newsav == NULL) { 4709 /* XXX don't free new SA index allocated in above. */ 4710 return key_senderror(so, m, error); 4711 } 4712 4713 /* set spi */ 4714 newsav->spi = htonl(spi); 4715 4716 /* delete the entry in acqtree */ 4717 if (mhp->msg->sadb_msg_seq != 0) { 4718 struct secacq *acq; 4719 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4720 /* reset counter in order to deletion by timehandler. */ 4721 acq->created = time_second; 4722 acq->count = 0; 4723 } 4724 } 4725 4726 { 4727 struct mbuf *n, *nn; 4728 struct sadb_sa *m_sa; 4729 struct sadb_msg *newmsg; 4730 int off, len; 4731 4732 /* create new sadb_msg to reply. */ 4733 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4734 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4735 4736 MGETHDR(n, M_NOWAIT, MT_DATA); 4737 if (len > MHLEN) { 4738 MCLGET(n, M_NOWAIT); 4739 if ((n->m_flags & M_EXT) == 0) { 4740 m_freem(n); 4741 n = NULL; 4742 } 4743 } 4744 if (!n) 4745 return key_senderror(so, m, ENOBUFS); 4746 4747 n->m_len = len; 4748 n->m_next = NULL; 4749 off = 0; 4750 4751 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4752 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4753 4754 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4755 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4756 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4757 m_sa->sadb_sa_spi = htonl(spi); 4758 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4759 4760 IPSEC_ASSERT(off == len, 4761 ("length inconsistency (off %u len %u)", off, len)); 4762 4763 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4764 SADB_EXT_ADDRESS_DST); 4765 if (!n->m_next) { 4766 m_freem(n); 4767 return key_senderror(so, m, ENOBUFS); 4768 } 4769 4770 if (n->m_len < sizeof(struct sadb_msg)) { 4771 n = m_pullup(n, sizeof(struct sadb_msg)); 4772 if (n == NULL) 4773 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4774 } 4775 4776 n->m_pkthdr.len = 0; 4777 for (nn = n; nn; nn = nn->m_next) 4778 n->m_pkthdr.len += nn->m_len; 4779 4780 newmsg = mtod(n, struct sadb_msg *); 4781 newmsg->sadb_msg_seq = newsav->seq; 4782 newmsg->sadb_msg_errno = 0; 4783 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4784 4785 m_freem(m); 4786 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4787 } 4788} 4789 4790/* 4791 * allocating new SPI 4792 * called by key_getspi(). 4793 * OUT: 4794 * 0: failure. 4795 * others: success. 4796 */ 4797static u_int32_t 4798key_do_getnewspi(struct sadb_spirange *spirange, struct secasindex *saidx) 4799{ 4800 u_int32_t newspi; 4801 u_int32_t min, max; 4802 int count = V_key_spi_trycnt; 4803 4804 /* set spi range to allocate */ 4805 if (spirange != NULL) { 4806 min = spirange->sadb_spirange_min; 4807 max = spirange->sadb_spirange_max; 4808 } else { 4809 min = V_key_spi_minval; 4810 max = V_key_spi_maxval; 4811 } 4812 /* IPCOMP needs 2-byte SPI */ 4813 if (saidx->proto == IPPROTO_IPCOMP) { 4814 u_int32_t t; 4815 if (min >= 0x10000) 4816 min = 0xffff; 4817 if (max >= 0x10000) 4818 max = 0xffff; 4819 if (min > max) { 4820 t = min; min = max; max = t; 4821 } 4822 } 4823 4824 if (min == max) { 4825 if (key_checkspidup(saidx, min) != NULL) { 4826 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4827 __func__, min)); 4828 return 0; 4829 } 4830 4831 count--; /* taking one cost. */ 4832 newspi = min; 4833 4834 } else { 4835 4836 /* init SPI */ 4837 newspi = 0; 4838 4839 /* when requesting to allocate spi ranged */ 4840 while (count--) { 4841 /* generate pseudo-random SPI value ranged. */ 4842 newspi = min + (key_random() % (max - min + 1)); 4843 4844 if (key_checkspidup(saidx, newspi) == NULL) 4845 break; 4846 } 4847 4848 if (count == 0 || newspi == 0) { 4849 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4850 __func__)); 4851 return 0; 4852 } 4853 } 4854 4855 /* statistics */ 4856 keystat.getspi_count = 4857 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4858 4859 return newspi; 4860} 4861 4862/* 4863 * SADB_UPDATE processing 4864 * receive 4865 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4866 * key(AE), (identity(SD),) (sensitivity)> 4867 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4868 * and send 4869 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4870 * (identity(SD),) (sensitivity)> 4871 * to the ikmpd. 4872 * 4873 * m will always be freed. 4874 */ 4875static int 4876key_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 4877{ 4878 struct sadb_sa *sa0; 4879 struct sadb_address *src0, *dst0; 4880#ifdef IPSEC_NAT_T 4881 struct sadb_x_nat_t_type *type; 4882 struct sadb_x_nat_t_port *sport, *dport; 4883 struct sadb_address *iaddr, *raddr; 4884 struct sadb_x_nat_t_frag *frag; 4885#endif 4886 struct secasindex saidx; 4887 struct secashead *sah; 4888 struct secasvar *sav; 4889 u_int16_t proto; 4890 u_int8_t mode; 4891 u_int32_t reqid; 4892 int error; 4893 4894 IPSEC_ASSERT(so != NULL, ("null socket")); 4895 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4896 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4897 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4898 4899 /* map satype to proto */ 4900 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4901 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4902 __func__)); 4903 return key_senderror(so, m, EINVAL); 4904 } 4905 4906 if (mhp->ext[SADB_EXT_SA] == NULL || 4907 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4908 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4909 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4910 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4911 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4912 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4913 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4914 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4915 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4916 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4917 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4918 __func__)); 4919 return key_senderror(so, m, EINVAL); 4920 } 4921 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4922 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4923 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4924 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4925 __func__)); 4926 return key_senderror(so, m, EINVAL); 4927 } 4928 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4929 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4930 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4931 } else { 4932 mode = IPSEC_MODE_ANY; 4933 reqid = 0; 4934 } 4935 /* XXX boundary checking for other extensions */ 4936 4937 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4938 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4939 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4940 4941 /* XXX boundary check against sa_len */ 4942 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4943 4944 /* 4945 * Make sure the port numbers are zero. 4946 * In case of NAT-T we will update them later if needed. 4947 */ 4948 KEY_PORTTOSADDR(&saidx.src, 0); 4949 KEY_PORTTOSADDR(&saidx.dst, 0); 4950 4951#ifdef IPSEC_NAT_T 4952 /* 4953 * Handle NAT-T info if present. 4954 */ 4955 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 4956 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 4957 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 4958 4959 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 4960 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 4961 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4962 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 4963 __func__)); 4964 return key_senderror(so, m, EINVAL); 4965 } 4966 4967 type = (struct sadb_x_nat_t_type *) 4968 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 4969 sport = (struct sadb_x_nat_t_port *) 4970 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4971 dport = (struct sadb_x_nat_t_port *) 4972 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4973 } else { 4974 type = 0; 4975 sport = dport = 0; 4976 } 4977 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 4978 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 4979 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 4980 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 4981 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4982 __func__)); 4983 return key_senderror(so, m, EINVAL); 4984 } 4985 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 4986 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 4987 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 4988 } else { 4989 iaddr = raddr = NULL; 4990 } 4991 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 4992 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 4993 ipseclog((LOG_DEBUG, "%s: invalid message\n", 4994 __func__)); 4995 return key_senderror(so, m, EINVAL); 4996 } 4997 frag = (struct sadb_x_nat_t_frag *) 4998 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 4999 } else { 5000 frag = 0; 5001 } 5002#endif 5003 5004 /* get a SA header */ 5005 if ((sah = key_getsah(&saidx)) == NULL) { 5006 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 5007 return key_senderror(so, m, ENOENT); 5008 } 5009 5010 /* set spidx if there */ 5011 /* XXX rewrite */ 5012 error = key_setident(sah, m, mhp); 5013 if (error) 5014 return key_senderror(so, m, error); 5015 5016 /* find a SA with sequence number. */ 5017#ifdef IPSEC_DOSEQCHECK 5018 if (mhp->msg->sadb_msg_seq != 0 5019 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 5020 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 5021 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 5022 return key_senderror(so, m, ENOENT); 5023 } 5024#else 5025 SAHTREE_LOCK(); 5026 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5027 SAHTREE_UNLOCK(); 5028 if (sav == NULL) { 5029 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 5030 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5031 return key_senderror(so, m, EINVAL); 5032 } 5033#endif 5034 5035 /* validity check */ 5036 if (sav->sah->saidx.proto != proto) { 5037 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 5038 "(DB=%u param=%u)\n", __func__, 5039 sav->sah->saidx.proto, proto)); 5040 return key_senderror(so, m, EINVAL); 5041 } 5042#ifdef IPSEC_DOSEQCHECK 5043 if (sav->spi != sa0->sadb_sa_spi) { 5044 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 5045 __func__, 5046 (u_int32_t)ntohl(sav->spi), 5047 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 5048 return key_senderror(so, m, EINVAL); 5049 } 5050#endif 5051 if (sav->pid != mhp->msg->sadb_msg_pid) { 5052 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 5053 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 5054 return key_senderror(so, m, EINVAL); 5055 } 5056 5057 /* copy sav values */ 5058 error = key_setsaval(sav, m, mhp); 5059 if (error) { 5060 KEY_FREESAV(&sav); 5061 return key_senderror(so, m, error); 5062 } 5063 5064#ifdef IPSEC_NAT_T 5065 /* 5066 * Handle more NAT-T info if present, 5067 * now that we have a sav to fill. 5068 */ 5069 if (type) 5070 sav->natt_type = type->sadb_x_nat_t_type_type; 5071 5072 if (sport) 5073 KEY_PORTTOSADDR(&sav->sah->saidx.src, 5074 sport->sadb_x_nat_t_port_port); 5075 if (dport) 5076 KEY_PORTTOSADDR(&sav->sah->saidx.dst, 5077 dport->sadb_x_nat_t_port_port); 5078 5079#if 0 5080 /* 5081 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5082 * We should actually check for a minimum MTU here, if we 5083 * want to support it in ip_output. 5084 */ 5085 if (frag) 5086 sav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5087#endif 5088#endif 5089 5090 /* check SA values to be mature. */ 5091 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 5092 KEY_FREESAV(&sav); 5093 return key_senderror(so, m, 0); 5094 } 5095 5096 { 5097 struct mbuf *n; 5098 5099 /* set msg buf from mhp */ 5100 n = key_getmsgbuf_x1(m, mhp); 5101 if (n == NULL) { 5102 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5103 return key_senderror(so, m, ENOBUFS); 5104 } 5105 5106 m_freem(m); 5107 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5108 } 5109} 5110 5111/* 5112 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5113 * only called by key_update(). 5114 * OUT: 5115 * NULL : not found 5116 * others : found, pointer to a SA. 5117 */ 5118#ifdef IPSEC_DOSEQCHECK 5119static struct secasvar * 5120key_getsavbyseq(struct secashead *sah, u_int32_t seq) 5121{ 5122 struct secasvar *sav; 5123 u_int state; 5124 5125 state = SADB_SASTATE_LARVAL; 5126 5127 /* search SAD with sequence number ? */ 5128 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5129 5130 KEY_CHKSASTATE(state, sav->state, __func__); 5131 5132 if (sav->seq == seq) { 5133 sa_addref(sav); 5134 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 5135 printf("DP %s cause refcnt++:%d SA:%p\n", 5136 __func__, sav->refcnt, sav)); 5137 return sav; 5138 } 5139 } 5140 5141 return NULL; 5142} 5143#endif 5144 5145/* 5146 * SADB_ADD processing 5147 * add an entry to SA database, when received 5148 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5149 * key(AE), (identity(SD),) (sensitivity)> 5150 * from the ikmpd, 5151 * and send 5152 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5153 * (identity(SD),) (sensitivity)> 5154 * to the ikmpd. 5155 * 5156 * IGNORE identity and sensitivity messages. 5157 * 5158 * m will always be freed. 5159 */ 5160static int 5161key_add(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5162{ 5163 struct sadb_sa *sa0; 5164 struct sadb_address *src0, *dst0; 5165#ifdef IPSEC_NAT_T 5166 struct sadb_x_nat_t_type *type; 5167 struct sadb_address *iaddr, *raddr; 5168 struct sadb_x_nat_t_frag *frag; 5169#endif 5170 struct secasindex saidx; 5171 struct secashead *newsah; 5172 struct secasvar *newsav; 5173 u_int16_t proto; 5174 u_int8_t mode; 5175 u_int32_t reqid; 5176 int error; 5177 5178 IPSEC_ASSERT(so != NULL, ("null socket")); 5179 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5180 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5181 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5182 5183 /* map satype to proto */ 5184 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5185 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5186 __func__)); 5187 return key_senderror(so, m, EINVAL); 5188 } 5189 5190 if (mhp->ext[SADB_EXT_SA] == NULL || 5191 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5192 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5193 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5194 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5195 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5196 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5197 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5198 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5199 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5200 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5201 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5202 __func__)); 5203 return key_senderror(so, m, EINVAL); 5204 } 5205 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5206 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5207 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5208 /* XXX need more */ 5209 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5210 __func__)); 5211 return key_senderror(so, m, EINVAL); 5212 } 5213 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5214 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5215 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5216 } else { 5217 mode = IPSEC_MODE_ANY; 5218 reqid = 0; 5219 } 5220 5221 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5222 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5223 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5224 5225 /* XXX boundary check against sa_len */ 5226 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 5227 5228 /* 5229 * Make sure the port numbers are zero. 5230 * In case of NAT-T we will update them later if needed. 5231 */ 5232 KEY_PORTTOSADDR(&saidx.src, 0); 5233 KEY_PORTTOSADDR(&saidx.dst, 0); 5234 5235#ifdef IPSEC_NAT_T 5236 /* 5237 * Handle NAT-T info if present. 5238 */ 5239 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL && 5240 mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5241 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5242 struct sadb_x_nat_t_port *sport, *dport; 5243 5244 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type) || 5245 mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5246 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5247 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5248 __func__)); 5249 return key_senderror(so, m, EINVAL); 5250 } 5251 5252 type = (struct sadb_x_nat_t_type *) 5253 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5254 sport = (struct sadb_x_nat_t_port *) 5255 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5256 dport = (struct sadb_x_nat_t_port *) 5257 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5258 5259 if (sport) 5260 KEY_PORTTOSADDR(&saidx.src, 5261 sport->sadb_x_nat_t_port_port); 5262 if (dport) 5263 KEY_PORTTOSADDR(&saidx.dst, 5264 dport->sadb_x_nat_t_port_port); 5265 } else { 5266 type = 0; 5267 } 5268 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL && 5269 mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 5270 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr) || 5271 mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 5272 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5273 __func__)); 5274 return key_senderror(so, m, EINVAL); 5275 } 5276 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 5277 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 5278 ipseclog((LOG_DEBUG, "%s: NAT-T OAi/r present\n", __func__)); 5279 } else { 5280 iaddr = raddr = NULL; 5281 } 5282 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 5283 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 5284 ipseclog((LOG_DEBUG, "%s: invalid message\n", 5285 __func__)); 5286 return key_senderror(so, m, EINVAL); 5287 } 5288 frag = (struct sadb_x_nat_t_frag *) 5289 mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 5290 } else { 5291 frag = 0; 5292 } 5293#endif 5294 5295 /* get a SA header */ 5296 if ((newsah = key_getsah(&saidx)) == NULL) { 5297 /* create a new SA header */ 5298 if ((newsah = key_newsah(&saidx)) == NULL) { 5299 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 5300 return key_senderror(so, m, ENOBUFS); 5301 } 5302 } 5303 5304 /* set spidx if there */ 5305 /* XXX rewrite */ 5306 error = key_setident(newsah, m, mhp); 5307 if (error) { 5308 return key_senderror(so, m, error); 5309 } 5310 5311 /* create new SA entry. */ 5312 /* We can create new SA only if SPI is differenct. */ 5313 SAHTREE_LOCK(); 5314 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5315 SAHTREE_UNLOCK(); 5316 if (newsav != NULL) { 5317 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5318 return key_senderror(so, m, EEXIST); 5319 } 5320 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5321 if (newsav == NULL) { 5322 return key_senderror(so, m, error); 5323 } 5324 5325#ifdef IPSEC_NAT_T 5326 /* 5327 * Handle more NAT-T info if present, 5328 * now that we have a sav to fill. 5329 */ 5330 if (type) 5331 newsav->natt_type = type->sadb_x_nat_t_type_type; 5332 5333#if 0 5334 /* 5335 * In case SADB_X_EXT_NAT_T_FRAG was not given, leave it at 0. 5336 * We should actually check for a minimum MTU here, if we 5337 * want to support it in ip_output. 5338 */ 5339 if (frag) 5340 newsav->natt_esp_frag_len = frag->sadb_x_nat_t_frag_fraglen; 5341#endif 5342#endif 5343 5344 /* check SA values to be mature. */ 5345 if ((error = key_mature(newsav)) != 0) { 5346 KEY_FREESAV(&newsav); 5347 return key_senderror(so, m, error); 5348 } 5349 5350 /* 5351 * don't call key_freesav() here, as we would like to keep the SA 5352 * in the database on success. 5353 */ 5354 5355 { 5356 struct mbuf *n; 5357 5358 /* set msg buf from mhp */ 5359 n = key_getmsgbuf_x1(m, mhp); 5360 if (n == NULL) { 5361 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5362 return key_senderror(so, m, ENOBUFS); 5363 } 5364 5365 m_freem(m); 5366 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5367 } 5368} 5369 5370/* m is retained */ 5371static int 5372key_setident(struct secashead *sah, struct mbuf *m, 5373 const struct sadb_msghdr *mhp) 5374{ 5375 const struct sadb_ident *idsrc, *iddst; 5376 int idsrclen, iddstlen; 5377 5378 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5379 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5380 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5381 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5382 5383 /* don't make buffer if not there */ 5384 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5385 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5386 sah->idents = NULL; 5387 sah->identd = NULL; 5388 return 0; 5389 } 5390 5391 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5392 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5393 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5394 return EINVAL; 5395 } 5396 5397 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5398 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5399 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5400 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5401 5402 /* validity check */ 5403 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5404 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5405 return EINVAL; 5406 } 5407 5408 switch (idsrc->sadb_ident_type) { 5409 case SADB_IDENTTYPE_PREFIX: 5410 case SADB_IDENTTYPE_FQDN: 5411 case SADB_IDENTTYPE_USERFQDN: 5412 default: 5413 /* XXX do nothing */ 5414 sah->idents = NULL; 5415 sah->identd = NULL; 5416 return 0; 5417 } 5418 5419 /* make structure */ 5420 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5421 if (sah->idents == NULL) { 5422 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5423 return ENOBUFS; 5424 } 5425 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5426 if (sah->identd == NULL) { 5427 free(sah->idents, M_IPSEC_MISC); 5428 sah->idents = NULL; 5429 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5430 return ENOBUFS; 5431 } 5432 sah->idents->type = idsrc->sadb_ident_type; 5433 sah->idents->id = idsrc->sadb_ident_id; 5434 5435 sah->identd->type = iddst->sadb_ident_type; 5436 sah->identd->id = iddst->sadb_ident_id; 5437 5438 return 0; 5439} 5440 5441/* 5442 * m will not be freed on return. 5443 * it is caller's responsibility to free the result. 5444 */ 5445static struct mbuf * 5446key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) 5447{ 5448 struct mbuf *n; 5449 5450 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5451 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5452 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5453 5454 /* create new sadb_msg to reply. */ 5455 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5456 SADB_EXT_SA, SADB_X_EXT_SA2, 5457 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5458 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5459 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5460 if (!n) 5461 return NULL; 5462 5463 if (n->m_len < sizeof(struct sadb_msg)) { 5464 n = m_pullup(n, sizeof(struct sadb_msg)); 5465 if (n == NULL) 5466 return NULL; 5467 } 5468 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5469 mtod(n, struct sadb_msg *)->sadb_msg_len = 5470 PFKEY_UNIT64(n->m_pkthdr.len); 5471 5472 return n; 5473} 5474 5475/* 5476 * SADB_DELETE processing 5477 * receive 5478 * <base, SA(*), address(SD)> 5479 * from the ikmpd, and set SADB_SASTATE_DEAD, 5480 * and send, 5481 * <base, SA(*), address(SD)> 5482 * to the ikmpd. 5483 * 5484 * m will always be freed. 5485 */ 5486static int 5487key_delete(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5488{ 5489 struct sadb_sa *sa0; 5490 struct sadb_address *src0, *dst0; 5491 struct secasindex saidx; 5492 struct secashead *sah; 5493 struct secasvar *sav = NULL; 5494 u_int16_t proto; 5495 5496 IPSEC_ASSERT(so != NULL, ("null socket")); 5497 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5498 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5499 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5500 5501 /* map satype to proto */ 5502 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5503 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5504 __func__)); 5505 return key_senderror(so, m, EINVAL); 5506 } 5507 5508 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5509 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5510 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5511 __func__)); 5512 return key_senderror(so, m, EINVAL); 5513 } 5514 5515 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5516 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5517 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5518 __func__)); 5519 return key_senderror(so, m, EINVAL); 5520 } 5521 5522 if (mhp->ext[SADB_EXT_SA] == NULL) { 5523 /* 5524 * Caller wants us to delete all non-LARVAL SAs 5525 * that match the src/dst. This is used during 5526 * IKE INITIAL-CONTACT. 5527 */ 5528 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5529 return key_delete_all(so, m, mhp, proto); 5530 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5531 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5532 __func__)); 5533 return key_senderror(so, m, EINVAL); 5534 } 5535 5536 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5537 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5538 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5539 5540 /* XXX boundary check against sa_len */ 5541 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5542 5543 /* 5544 * Make sure the port numbers are zero. 5545 * In case of NAT-T we will update them later if needed. 5546 */ 5547 KEY_PORTTOSADDR(&saidx.src, 0); 5548 KEY_PORTTOSADDR(&saidx.dst, 0); 5549 5550#ifdef IPSEC_NAT_T 5551 /* 5552 * Handle NAT-T info if present. 5553 */ 5554 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5555 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5556 struct sadb_x_nat_t_port *sport, *dport; 5557 5558 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5559 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5560 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5561 __func__)); 5562 return key_senderror(so, m, EINVAL); 5563 } 5564 5565 sport = (struct sadb_x_nat_t_port *) 5566 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5567 dport = (struct sadb_x_nat_t_port *) 5568 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5569 5570 if (sport) 5571 KEY_PORTTOSADDR(&saidx.src, 5572 sport->sadb_x_nat_t_port_port); 5573 if (dport) 5574 KEY_PORTTOSADDR(&saidx.dst, 5575 dport->sadb_x_nat_t_port_port); 5576 } 5577#endif 5578 5579 /* get a SA header */ 5580 SAHTREE_LOCK(); 5581 LIST_FOREACH(sah, &V_sahtree, chain) { 5582 if (sah->state == SADB_SASTATE_DEAD) 5583 continue; 5584 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5585 continue; 5586 5587 /* get a SA with SPI. */ 5588 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5589 if (sav) 5590 break; 5591 } 5592 if (sah == NULL) { 5593 SAHTREE_UNLOCK(); 5594 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5595 return key_senderror(so, m, ENOENT); 5596 } 5597 5598 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5599 KEY_FREESAV(&sav); 5600 SAHTREE_UNLOCK(); 5601 5602 { 5603 struct mbuf *n; 5604 struct sadb_msg *newmsg; 5605 5606 /* create new sadb_msg to reply. */ 5607 /* XXX-BZ NAT-T extensions? */ 5608 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5609 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5610 if (!n) 5611 return key_senderror(so, m, ENOBUFS); 5612 5613 if (n->m_len < sizeof(struct sadb_msg)) { 5614 n = m_pullup(n, sizeof(struct sadb_msg)); 5615 if (n == NULL) 5616 return key_senderror(so, m, ENOBUFS); 5617 } 5618 newmsg = mtod(n, struct sadb_msg *); 5619 newmsg->sadb_msg_errno = 0; 5620 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5621 5622 m_freem(m); 5623 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5624 } 5625} 5626 5627/* 5628 * delete all SAs for src/dst. Called from key_delete(). 5629 */ 5630static int 5631key_delete_all(struct socket *so, struct mbuf *m, 5632 const struct sadb_msghdr *mhp, u_int16_t proto) 5633{ 5634 struct sadb_address *src0, *dst0; 5635 struct secasindex saidx; 5636 struct secashead *sah; 5637 struct secasvar *sav, *nextsav; 5638 u_int stateidx, state; 5639 5640 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5641 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5642 5643 /* XXX boundary check against sa_len */ 5644 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5645 5646 /* 5647 * Make sure the port numbers are zero. 5648 * In case of NAT-T we will update them later if needed. 5649 */ 5650 KEY_PORTTOSADDR(&saidx.src, 0); 5651 KEY_PORTTOSADDR(&saidx.dst, 0); 5652 5653#ifdef IPSEC_NAT_T 5654 /* 5655 * Handle NAT-T info if present. 5656 */ 5657 5658 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5659 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5660 struct sadb_x_nat_t_port *sport, *dport; 5661 5662 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5663 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5664 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5665 __func__)); 5666 return key_senderror(so, m, EINVAL); 5667 } 5668 5669 sport = (struct sadb_x_nat_t_port *) 5670 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5671 dport = (struct sadb_x_nat_t_port *) 5672 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5673 5674 if (sport) 5675 KEY_PORTTOSADDR(&saidx.src, 5676 sport->sadb_x_nat_t_port_port); 5677 if (dport) 5678 KEY_PORTTOSADDR(&saidx.dst, 5679 dport->sadb_x_nat_t_port_port); 5680 } 5681#endif 5682 5683 SAHTREE_LOCK(); 5684 LIST_FOREACH(sah, &V_sahtree, chain) { 5685 if (sah->state == SADB_SASTATE_DEAD) 5686 continue; 5687 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5688 continue; 5689 5690 /* Delete all non-LARVAL SAs. */ 5691 for (stateidx = 0; 5692 stateidx < _ARRAYLEN(saorder_state_alive); 5693 stateidx++) { 5694 state = saorder_state_alive[stateidx]; 5695 if (state == SADB_SASTATE_LARVAL) 5696 continue; 5697 for (sav = LIST_FIRST(&sah->savtree[state]); 5698 sav != NULL; sav = nextsav) { 5699 nextsav = LIST_NEXT(sav, chain); 5700 /* sanity check */ 5701 if (sav->state != state) { 5702 ipseclog((LOG_DEBUG, "%s: invalid " 5703 "sav->state (queue %d SA %d)\n", 5704 __func__, state, sav->state)); 5705 continue; 5706 } 5707 5708 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5709 KEY_FREESAV(&sav); 5710 } 5711 } 5712 } 5713 SAHTREE_UNLOCK(); 5714 { 5715 struct mbuf *n; 5716 struct sadb_msg *newmsg; 5717 5718 /* create new sadb_msg to reply. */ 5719 /* XXX-BZ NAT-T extensions? */ 5720 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5721 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5722 if (!n) 5723 return key_senderror(so, m, ENOBUFS); 5724 5725 if (n->m_len < sizeof(struct sadb_msg)) { 5726 n = m_pullup(n, sizeof(struct sadb_msg)); 5727 if (n == NULL) 5728 return key_senderror(so, m, ENOBUFS); 5729 } 5730 newmsg = mtod(n, struct sadb_msg *); 5731 newmsg->sadb_msg_errno = 0; 5732 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5733 5734 m_freem(m); 5735 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5736 } 5737} 5738 5739/* 5740 * SADB_GET processing 5741 * receive 5742 * <base, SA(*), address(SD)> 5743 * from the ikmpd, and get a SP and a SA to respond, 5744 * and send, 5745 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5746 * (identity(SD),) (sensitivity)> 5747 * to the ikmpd. 5748 * 5749 * m will always be freed. 5750 */ 5751static int 5752key_get(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5753{ 5754 struct sadb_sa *sa0; 5755 struct sadb_address *src0, *dst0; 5756 struct secasindex saidx; 5757 struct secashead *sah; 5758 struct secasvar *sav = NULL; 5759 u_int16_t proto; 5760 5761 IPSEC_ASSERT(so != NULL, ("null socket")); 5762 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5763 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5764 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5765 5766 /* map satype to proto */ 5767 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5768 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5769 __func__)); 5770 return key_senderror(so, m, EINVAL); 5771 } 5772 5773 if (mhp->ext[SADB_EXT_SA] == NULL || 5774 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5775 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5776 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5777 __func__)); 5778 return key_senderror(so, m, EINVAL); 5779 } 5780 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5781 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5782 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5783 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5784 __func__)); 5785 return key_senderror(so, m, EINVAL); 5786 } 5787 5788 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5789 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5790 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5791 5792 /* XXX boundary check against sa_len */ 5793 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5794 5795 /* 5796 * Make sure the port numbers are zero. 5797 * In case of NAT-T we will update them later if needed. 5798 */ 5799 KEY_PORTTOSADDR(&saidx.src, 0); 5800 KEY_PORTTOSADDR(&saidx.dst, 0); 5801 5802#ifdef IPSEC_NAT_T 5803 /* 5804 * Handle NAT-T info if present. 5805 */ 5806 5807 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 5808 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 5809 struct sadb_x_nat_t_port *sport, *dport; 5810 5811 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 5812 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 5813 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 5814 __func__)); 5815 return key_senderror(so, m, EINVAL); 5816 } 5817 5818 sport = (struct sadb_x_nat_t_port *) 5819 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5820 dport = (struct sadb_x_nat_t_port *) 5821 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5822 5823 if (sport) 5824 KEY_PORTTOSADDR(&saidx.src, 5825 sport->sadb_x_nat_t_port_port); 5826 if (dport) 5827 KEY_PORTTOSADDR(&saidx.dst, 5828 dport->sadb_x_nat_t_port_port); 5829 } 5830#endif 5831 5832 /* get a SA header */ 5833 SAHTREE_LOCK(); 5834 LIST_FOREACH(sah, &V_sahtree, chain) { 5835 if (sah->state == SADB_SASTATE_DEAD) 5836 continue; 5837 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5838 continue; 5839 5840 /* get a SA with SPI. */ 5841 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5842 if (sav) 5843 break; 5844 } 5845 SAHTREE_UNLOCK(); 5846 if (sah == NULL) { 5847 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5848 return key_senderror(so, m, ENOENT); 5849 } 5850 5851 { 5852 struct mbuf *n; 5853 u_int8_t satype; 5854 5855 /* map proto to satype */ 5856 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5857 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5858 __func__)); 5859 return key_senderror(so, m, EINVAL); 5860 } 5861 5862 /* create new sadb_msg to reply. */ 5863 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5864 mhp->msg->sadb_msg_pid); 5865 if (!n) 5866 return key_senderror(so, m, ENOBUFS); 5867 5868 m_freem(m); 5869 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5870 } 5871} 5872 5873/* XXX make it sysctl-configurable? */ 5874static void 5875key_getcomb_setlifetime(struct sadb_comb *comb) 5876{ 5877 5878 comb->sadb_comb_soft_allocations = 1; 5879 comb->sadb_comb_hard_allocations = 1; 5880 comb->sadb_comb_soft_bytes = 0; 5881 comb->sadb_comb_hard_bytes = 0; 5882 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5883 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5884 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5885 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5886} 5887 5888/* 5889 * XXX reorder combinations by preference 5890 * XXX no idea if the user wants ESP authentication or not 5891 */ 5892static struct mbuf * 5893key_getcomb_esp() 5894{ 5895 struct sadb_comb *comb; 5896 struct enc_xform *algo; 5897 struct mbuf *result = NULL, *m, *n; 5898 int encmin; 5899 int i, off, o; 5900 int totlen; 5901 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5902 5903 m = NULL; 5904 for (i = 1; i <= SADB_EALG_MAX; i++) { 5905 algo = esp_algorithm_lookup(i); 5906 if (algo == NULL) 5907 continue; 5908 5909 /* discard algorithms with key size smaller than system min */ 5910 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5911 continue; 5912 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5913 encmin = V_ipsec_esp_keymin; 5914 else 5915 encmin = _BITS(algo->minkey); 5916 5917 if (V_ipsec_esp_auth) 5918 m = key_getcomb_ah(); 5919 else { 5920 IPSEC_ASSERT(l <= MLEN, 5921 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5922 MGET(m, M_NOWAIT, MT_DATA); 5923 if (m) { 5924 M_ALIGN(m, l); 5925 m->m_len = l; 5926 m->m_next = NULL; 5927 bzero(mtod(m, caddr_t), m->m_len); 5928 } 5929 } 5930 if (!m) 5931 goto fail; 5932 5933 totlen = 0; 5934 for (n = m; n; n = n->m_next) 5935 totlen += n->m_len; 5936 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5937 5938 for (off = 0; off < totlen; off += l) { 5939 n = m_pulldown(m, off, l, &o); 5940 if (!n) { 5941 /* m is already freed */ 5942 goto fail; 5943 } 5944 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5945 bzero(comb, sizeof(*comb)); 5946 key_getcomb_setlifetime(comb); 5947 comb->sadb_comb_encrypt = i; 5948 comb->sadb_comb_encrypt_minbits = encmin; 5949 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5950 } 5951 5952 if (!result) 5953 result = m; 5954 else 5955 m_cat(result, m); 5956 } 5957 5958 return result; 5959 5960 fail: 5961 if (result) 5962 m_freem(result); 5963 return NULL; 5964} 5965 5966static void 5967key_getsizes_ah(const struct auth_hash *ah, int alg, u_int16_t* min, 5968 u_int16_t* max) 5969{ 5970 5971 *min = *max = ah->keysize; 5972 if (ah->keysize == 0) { 5973 /* 5974 * Transform takes arbitrary key size but algorithm 5975 * key size is restricted. Enforce this here. 5976 */ 5977 switch (alg) { 5978 case SADB_X_AALG_MD5: *min = *max = 16; break; 5979 case SADB_X_AALG_SHA: *min = *max = 20; break; 5980 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5981 case SADB_X_AALG_SHA2_256: *min = *max = 32; break; 5982 case SADB_X_AALG_SHA2_384: *min = *max = 48; break; 5983 case SADB_X_AALG_SHA2_512: *min = *max = 64; break; 5984 default: 5985 DPRINTF(("%s: unknown AH algorithm %u\n", 5986 __func__, alg)); 5987 break; 5988 } 5989 } 5990} 5991 5992/* 5993 * XXX reorder combinations by preference 5994 */ 5995static struct mbuf * 5996key_getcomb_ah() 5997{ 5998 struct sadb_comb *comb; 5999 struct auth_hash *algo; 6000 struct mbuf *m; 6001 u_int16_t minkeysize, maxkeysize; 6002 int i; 6003 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6004 6005 m = NULL; 6006 for (i = 1; i <= SADB_AALG_MAX; i++) { 6007#if 1 6008 /* we prefer HMAC algorithms, not old algorithms */ 6009 if (i != SADB_AALG_SHA1HMAC && 6010 i != SADB_AALG_MD5HMAC && 6011 i != SADB_X_AALG_SHA2_256 && 6012 i != SADB_X_AALG_SHA2_384 && 6013 i != SADB_X_AALG_SHA2_512) 6014 continue; 6015#endif 6016 algo = ah_algorithm_lookup(i); 6017 if (!algo) 6018 continue; 6019 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 6020 /* discard algorithms with key size smaller than system min */ 6021 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 6022 continue; 6023 6024 if (!m) { 6025 IPSEC_ASSERT(l <= MLEN, 6026 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6027 MGET(m, M_NOWAIT, MT_DATA); 6028 if (m) { 6029 M_ALIGN(m, l); 6030 m->m_len = l; 6031 m->m_next = NULL; 6032 } 6033 } else 6034 M_PREPEND(m, l, M_NOWAIT); 6035 if (!m) 6036 return NULL; 6037 6038 comb = mtod(m, struct sadb_comb *); 6039 bzero(comb, sizeof(*comb)); 6040 key_getcomb_setlifetime(comb); 6041 comb->sadb_comb_auth = i; 6042 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 6043 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 6044 } 6045 6046 return m; 6047} 6048 6049/* 6050 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 6051 * XXX reorder combinations by preference 6052 */ 6053static struct mbuf * 6054key_getcomb_ipcomp() 6055{ 6056 struct sadb_comb *comb; 6057 struct comp_algo *algo; 6058 struct mbuf *m; 6059 int i; 6060 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 6061 6062 m = NULL; 6063 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 6064 algo = ipcomp_algorithm_lookup(i); 6065 if (!algo) 6066 continue; 6067 6068 if (!m) { 6069 IPSEC_ASSERT(l <= MLEN, 6070 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 6071 MGET(m, M_NOWAIT, MT_DATA); 6072 if (m) { 6073 M_ALIGN(m, l); 6074 m->m_len = l; 6075 m->m_next = NULL; 6076 } 6077 } else 6078 M_PREPEND(m, l, M_NOWAIT); 6079 if (!m) 6080 return NULL; 6081 6082 comb = mtod(m, struct sadb_comb *); 6083 bzero(comb, sizeof(*comb)); 6084 key_getcomb_setlifetime(comb); 6085 comb->sadb_comb_encrypt = i; 6086 /* what should we set into sadb_comb_*_{min,max}bits? */ 6087 } 6088 6089 return m; 6090} 6091 6092/* 6093 * XXX no way to pass mode (transport/tunnel) to userland 6094 * XXX replay checking? 6095 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6096 */ 6097static struct mbuf * 6098key_getprop(const struct secasindex *saidx) 6099{ 6100 struct sadb_prop *prop; 6101 struct mbuf *m, *n; 6102 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6103 int totlen; 6104 6105 switch (saidx->proto) { 6106 case IPPROTO_ESP: 6107 m = key_getcomb_esp(); 6108 break; 6109 case IPPROTO_AH: 6110 m = key_getcomb_ah(); 6111 break; 6112 case IPPROTO_IPCOMP: 6113 m = key_getcomb_ipcomp(); 6114 break; 6115 default: 6116 return NULL; 6117 } 6118 6119 if (!m) 6120 return NULL; 6121 M_PREPEND(m, l, M_NOWAIT); 6122 if (!m) 6123 return NULL; 6124 6125 totlen = 0; 6126 for (n = m; n; n = n->m_next) 6127 totlen += n->m_len; 6128 6129 prop = mtod(m, struct sadb_prop *); 6130 bzero(prop, sizeof(*prop)); 6131 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6132 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6133 prop->sadb_prop_replay = 32; /* XXX */ 6134 6135 return m; 6136} 6137 6138/* 6139 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 6140 * send 6141 * <base, SA, address(SD), (address(P)), x_policy, 6142 * (identity(SD),) (sensitivity,) proposal> 6143 * to KMD, and expect to receive 6144 * <base> with SADB_ACQUIRE if error occured, 6145 * or 6146 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6147 * from KMD by PF_KEY. 6148 * 6149 * XXX x_policy is outside of RFC2367 (KAME extension). 6150 * XXX sensitivity is not supported. 6151 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6152 * see comment for key_getcomb_ipcomp(). 6153 * 6154 * OUT: 6155 * 0 : succeed 6156 * others: error number 6157 */ 6158static int 6159key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6160{ 6161 struct mbuf *result = NULL, *m; 6162 struct secacq *newacq; 6163 u_int8_t satype; 6164 int error = -1; 6165 u_int32_t seq; 6166 6167 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 6168 satype = key_proto2satype(saidx->proto); 6169 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 6170 6171 /* 6172 * We never do anything about acquirng SA. There is anather 6173 * solution that kernel blocks to send SADB_ACQUIRE message until 6174 * getting something message from IKEd. In later case, to be 6175 * managed with ACQUIRING list. 6176 */ 6177 /* Get an entry to check whether sending message or not. */ 6178 if ((newacq = key_getacq(saidx)) != NULL) { 6179 if (V_key_blockacq_count < newacq->count) { 6180 /* reset counter and do send message. */ 6181 newacq->count = 0; 6182 } else { 6183 /* increment counter and do nothing. */ 6184 newacq->count++; 6185 return 0; 6186 } 6187 } else { 6188 /* make new entry for blocking to send SADB_ACQUIRE. */ 6189 if ((newacq = key_newacq(saidx)) == NULL) 6190 return ENOBUFS; 6191 } 6192 6193 6194 seq = newacq->seq; 6195 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6196 if (!m) { 6197 error = ENOBUFS; 6198 goto fail; 6199 } 6200 result = m; 6201 6202 /* 6203 * No SADB_X_EXT_NAT_T_* here: we do not know 6204 * anything related to NAT-T at this time. 6205 */ 6206 6207 /* set sadb_address for saidx's. */ 6208 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6209 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6210 if (!m) { 6211 error = ENOBUFS; 6212 goto fail; 6213 } 6214 m_cat(result, m); 6215 6216 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6217 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 6218 if (!m) { 6219 error = ENOBUFS; 6220 goto fail; 6221 } 6222 m_cat(result, m); 6223 6224 /* XXX proxy address (optional) */ 6225 6226 /* set sadb_x_policy */ 6227 if (sp) { 6228 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6229 if (!m) { 6230 error = ENOBUFS; 6231 goto fail; 6232 } 6233 m_cat(result, m); 6234 } 6235 6236 /* XXX identity (optional) */ 6237#if 0 6238 if (idexttype && fqdn) { 6239 /* create identity extension (FQDN) */ 6240 struct sadb_ident *id; 6241 int fqdnlen; 6242 6243 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6244 id = (struct sadb_ident *)p; 6245 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6246 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6247 id->sadb_ident_exttype = idexttype; 6248 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6249 bcopy(fqdn, id + 1, fqdnlen); 6250 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6251 } 6252 6253 if (idexttype) { 6254 /* create identity extension (USERFQDN) */ 6255 struct sadb_ident *id; 6256 int userfqdnlen; 6257 6258 if (userfqdn) { 6259 /* +1 for terminating-NUL */ 6260 userfqdnlen = strlen(userfqdn) + 1; 6261 } else 6262 userfqdnlen = 0; 6263 id = (struct sadb_ident *)p; 6264 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6265 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6266 id->sadb_ident_exttype = idexttype; 6267 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6268 /* XXX is it correct? */ 6269 if (curproc && curproc->p_cred) 6270 id->sadb_ident_id = curproc->p_cred->p_ruid; 6271 if (userfqdn && userfqdnlen) 6272 bcopy(userfqdn, id + 1, userfqdnlen); 6273 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6274 } 6275#endif 6276 6277 /* XXX sensitivity (optional) */ 6278 6279 /* create proposal/combination extension */ 6280 m = key_getprop(saidx); 6281#if 0 6282 /* 6283 * spec conformant: always attach proposal/combination extension, 6284 * the problem is that we have no way to attach it for ipcomp, 6285 * due to the way sadb_comb is declared in RFC2367. 6286 */ 6287 if (!m) { 6288 error = ENOBUFS; 6289 goto fail; 6290 } 6291 m_cat(result, m); 6292#else 6293 /* 6294 * outside of spec; make proposal/combination extension optional. 6295 */ 6296 if (m) 6297 m_cat(result, m); 6298#endif 6299 6300 if ((result->m_flags & M_PKTHDR) == 0) { 6301 error = EINVAL; 6302 goto fail; 6303 } 6304 6305 if (result->m_len < sizeof(struct sadb_msg)) { 6306 result = m_pullup(result, sizeof(struct sadb_msg)); 6307 if (result == NULL) { 6308 error = ENOBUFS; 6309 goto fail; 6310 } 6311 } 6312 6313 result->m_pkthdr.len = 0; 6314 for (m = result; m; m = m->m_next) 6315 result->m_pkthdr.len += m->m_len; 6316 6317 mtod(result, struct sadb_msg *)->sadb_msg_len = 6318 PFKEY_UNIT64(result->m_pkthdr.len); 6319 6320 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6321 6322 fail: 6323 if (result) 6324 m_freem(result); 6325 return error; 6326} 6327 6328static struct secacq * 6329key_newacq(const struct secasindex *saidx) 6330{ 6331 struct secacq *newacq; 6332 6333 /* get new entry */ 6334 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6335 if (newacq == NULL) { 6336 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6337 return NULL; 6338 } 6339 6340 /* copy secindex */ 6341 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 6342 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 6343 newacq->created = time_second; 6344 newacq->count = 0; 6345 6346 /* add to acqtree */ 6347 ACQ_LOCK(); 6348 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 6349 ACQ_UNLOCK(); 6350 6351 return newacq; 6352} 6353 6354static struct secacq * 6355key_getacq(const struct secasindex *saidx) 6356{ 6357 struct secacq *acq; 6358 6359 ACQ_LOCK(); 6360 LIST_FOREACH(acq, &V_acqtree, chain) { 6361 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 6362 break; 6363 } 6364 ACQ_UNLOCK(); 6365 6366 return acq; 6367} 6368 6369static struct secacq * 6370key_getacqbyseq(u_int32_t seq) 6371{ 6372 struct secacq *acq; 6373 6374 ACQ_LOCK(); 6375 LIST_FOREACH(acq, &V_acqtree, chain) { 6376 if (acq->seq == seq) 6377 break; 6378 } 6379 ACQ_UNLOCK(); 6380 6381 return acq; 6382} 6383 6384static struct secspacq * 6385key_newspacq(struct secpolicyindex *spidx) 6386{ 6387 struct secspacq *acq; 6388 6389 /* get new entry */ 6390 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 6391 if (acq == NULL) { 6392 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6393 return NULL; 6394 } 6395 6396 /* copy secindex */ 6397 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 6398 acq->created = time_second; 6399 acq->count = 0; 6400 6401 /* add to spacqtree */ 6402 SPACQ_LOCK(); 6403 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 6404 SPACQ_UNLOCK(); 6405 6406 return acq; 6407} 6408 6409static struct secspacq * 6410key_getspacq(struct secpolicyindex *spidx) 6411{ 6412 struct secspacq *acq; 6413 6414 SPACQ_LOCK(); 6415 LIST_FOREACH(acq, &V_spacqtree, chain) { 6416 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 6417 /* NB: return holding spacq_lock */ 6418 return acq; 6419 } 6420 } 6421 SPACQ_UNLOCK(); 6422 6423 return NULL; 6424} 6425 6426/* 6427 * SADB_ACQUIRE processing, 6428 * in first situation, is receiving 6429 * <base> 6430 * from the ikmpd, and clear sequence of its secasvar entry. 6431 * 6432 * In second situation, is receiving 6433 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6434 * from a user land process, and return 6435 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6436 * to the socket. 6437 * 6438 * m will always be freed. 6439 */ 6440static int 6441key_acquire2(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6442{ 6443 const struct sadb_address *src0, *dst0; 6444 struct secasindex saidx; 6445 struct secashead *sah; 6446 u_int16_t proto; 6447 int error; 6448 6449 IPSEC_ASSERT(so != NULL, ("null socket")); 6450 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6451 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6452 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6453 6454 /* 6455 * Error message from KMd. 6456 * We assume that if error was occured in IKEd, the length of PFKEY 6457 * message is equal to the size of sadb_msg structure. 6458 * We do not raise error even if error occured in this function. 6459 */ 6460 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6461 struct secacq *acq; 6462 6463 /* check sequence number */ 6464 if (mhp->msg->sadb_msg_seq == 0) { 6465 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6466 "number.\n", __func__)); 6467 m_freem(m); 6468 return 0; 6469 } 6470 6471 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6472 /* 6473 * the specified larval SA is already gone, or we got 6474 * a bogus sequence number. we can silently ignore it. 6475 */ 6476 m_freem(m); 6477 return 0; 6478 } 6479 6480 /* reset acq counter in order to deletion by timehander. */ 6481 acq->created = time_second; 6482 acq->count = 0; 6483 m_freem(m); 6484 return 0; 6485 } 6486 6487 /* 6488 * This message is from user land. 6489 */ 6490 6491 /* map satype to proto */ 6492 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6493 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6494 __func__)); 6495 return key_senderror(so, m, EINVAL); 6496 } 6497 6498 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6499 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6500 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6501 /* error */ 6502 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6503 __func__)); 6504 return key_senderror(so, m, EINVAL); 6505 } 6506 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6507 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6508 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6509 /* error */ 6510 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6511 __func__)); 6512 return key_senderror(so, m, EINVAL); 6513 } 6514 6515 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6516 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6517 6518 /* XXX boundary check against sa_len */ 6519 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6520 6521 /* 6522 * Make sure the port numbers are zero. 6523 * In case of NAT-T we will update them later if needed. 6524 */ 6525 KEY_PORTTOSADDR(&saidx.src, 0); 6526 KEY_PORTTOSADDR(&saidx.dst, 0); 6527 6528#ifndef IPSEC_NAT_T 6529 /* 6530 * Handle NAT-T info if present. 6531 */ 6532 6533 if (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL && 6534 mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL) { 6535 struct sadb_x_nat_t_port *sport, *dport; 6536 6537 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport) || 6538 mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 6539 ipseclog((LOG_DEBUG, "%s: invalid message.\n", 6540 __func__)); 6541 return key_senderror(so, m, EINVAL); 6542 } 6543 6544 sport = (struct sadb_x_nat_t_port *) 6545 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 6546 dport = (struct sadb_x_nat_t_port *) 6547 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 6548 6549 if (sport) 6550 KEY_PORTTOSADDR(&saidx.src, 6551 sport->sadb_x_nat_t_port_port); 6552 if (dport) 6553 KEY_PORTTOSADDR(&saidx.dst, 6554 dport->sadb_x_nat_t_port_port); 6555 } 6556#endif 6557 6558 /* get a SA index */ 6559 SAHTREE_LOCK(); 6560 LIST_FOREACH(sah, &V_sahtree, chain) { 6561 if (sah->state == SADB_SASTATE_DEAD) 6562 continue; 6563 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6564 break; 6565 } 6566 SAHTREE_UNLOCK(); 6567 if (sah != NULL) { 6568 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6569 return key_senderror(so, m, EEXIST); 6570 } 6571 6572 error = key_acquire(&saidx, NULL); 6573 if (error != 0) { 6574 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6575 __func__, mhp->msg->sadb_msg_errno)); 6576 return key_senderror(so, m, error); 6577 } 6578 6579 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6580} 6581 6582/* 6583 * SADB_REGISTER processing. 6584 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6585 * receive 6586 * <base> 6587 * from the ikmpd, and register a socket to send PF_KEY messages, 6588 * and send 6589 * <base, supported> 6590 * to KMD by PF_KEY. 6591 * If socket is detached, must free from regnode. 6592 * 6593 * m will always be freed. 6594 */ 6595static int 6596key_register(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6597{ 6598 struct secreg *reg, *newreg = 0; 6599 6600 IPSEC_ASSERT(so != NULL, ("null socket")); 6601 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6602 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6603 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6604 6605 /* check for invalid register message */ 6606 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6607 return key_senderror(so, m, EINVAL); 6608 6609 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6610 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6611 goto setmsg; 6612 6613 /* check whether existing or not */ 6614 REGTREE_LOCK(); 6615 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6616 if (reg->so == so) { 6617 REGTREE_UNLOCK(); 6618 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6619 __func__)); 6620 return key_senderror(so, m, EEXIST); 6621 } 6622 } 6623 6624 /* create regnode */ 6625 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6626 if (newreg == NULL) { 6627 REGTREE_UNLOCK(); 6628 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6629 return key_senderror(so, m, ENOBUFS); 6630 } 6631 6632 newreg->so = so; 6633 ((struct keycb *)sotorawcb(so))->kp_registered++; 6634 6635 /* add regnode to regtree. */ 6636 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6637 REGTREE_UNLOCK(); 6638 6639 setmsg: 6640 { 6641 struct mbuf *n; 6642 struct sadb_msg *newmsg; 6643 struct sadb_supported *sup; 6644 u_int len, alen, elen; 6645 int off; 6646 int i; 6647 struct sadb_alg *alg; 6648 6649 /* create new sadb_msg to reply. */ 6650 alen = 0; 6651 for (i = 1; i <= SADB_AALG_MAX; i++) { 6652 if (ah_algorithm_lookup(i)) 6653 alen += sizeof(struct sadb_alg); 6654 } 6655 if (alen) 6656 alen += sizeof(struct sadb_supported); 6657 elen = 0; 6658 for (i = 1; i <= SADB_EALG_MAX; i++) { 6659 if (esp_algorithm_lookup(i)) 6660 elen += sizeof(struct sadb_alg); 6661 } 6662 if (elen) 6663 elen += sizeof(struct sadb_supported); 6664 6665 len = sizeof(struct sadb_msg) + alen + elen; 6666 6667 if (len > MCLBYTES) 6668 return key_senderror(so, m, ENOBUFS); 6669 6670 MGETHDR(n, M_NOWAIT, MT_DATA); 6671 if (len > MHLEN) { 6672 MCLGET(n, M_NOWAIT); 6673 if ((n->m_flags & M_EXT) == 0) { 6674 m_freem(n); 6675 n = NULL; 6676 } 6677 } 6678 if (!n) 6679 return key_senderror(so, m, ENOBUFS); 6680 6681 n->m_pkthdr.len = n->m_len = len; 6682 n->m_next = NULL; 6683 off = 0; 6684 6685 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6686 newmsg = mtod(n, struct sadb_msg *); 6687 newmsg->sadb_msg_errno = 0; 6688 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6689 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6690 6691 /* for authentication algorithm */ 6692 if (alen) { 6693 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6694 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6695 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6696 off += PFKEY_ALIGN8(sizeof(*sup)); 6697 6698 for (i = 1; i <= SADB_AALG_MAX; i++) { 6699 struct auth_hash *aalgo; 6700 u_int16_t minkeysize, maxkeysize; 6701 6702 aalgo = ah_algorithm_lookup(i); 6703 if (!aalgo) 6704 continue; 6705 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6706 alg->sadb_alg_id = i; 6707 alg->sadb_alg_ivlen = 0; 6708 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6709 alg->sadb_alg_minbits = _BITS(minkeysize); 6710 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6711 off += PFKEY_ALIGN8(sizeof(*alg)); 6712 } 6713 } 6714 6715 /* for encryption algorithm */ 6716 if (elen) { 6717 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6718 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6719 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6720 off += PFKEY_ALIGN8(sizeof(*sup)); 6721 6722 for (i = 1; i <= SADB_EALG_MAX; i++) { 6723 struct enc_xform *ealgo; 6724 6725 ealgo = esp_algorithm_lookup(i); 6726 if (!ealgo) 6727 continue; 6728 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6729 alg->sadb_alg_id = i; 6730 alg->sadb_alg_ivlen = ealgo->blocksize; 6731 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6732 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6733 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6734 } 6735 } 6736 6737 IPSEC_ASSERT(off == len, 6738 ("length assumption failed (off %u len %u)", off, len)); 6739 6740 m_freem(m); 6741 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6742 } 6743} 6744 6745/* 6746 * free secreg entry registered. 6747 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6748 */ 6749void 6750key_freereg(struct socket *so) 6751{ 6752 struct secreg *reg; 6753 int i; 6754 6755 IPSEC_ASSERT(so != NULL, ("NULL so")); 6756 6757 /* 6758 * check whether existing or not. 6759 * check all type of SA, because there is a potential that 6760 * one socket is registered to multiple type of SA. 6761 */ 6762 REGTREE_LOCK(); 6763 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6764 LIST_FOREACH(reg, &V_regtree[i], chain) { 6765 if (reg->so == so && __LIST_CHAINED(reg)) { 6766 LIST_REMOVE(reg, chain); 6767 free(reg, M_IPSEC_SAR); 6768 break; 6769 } 6770 } 6771 } 6772 REGTREE_UNLOCK(); 6773} 6774 6775/* 6776 * SADB_EXPIRE processing 6777 * send 6778 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6779 * to KMD by PF_KEY. 6780 * NOTE: We send only soft lifetime extension. 6781 * 6782 * OUT: 0 : succeed 6783 * others : error number 6784 */ 6785static int 6786key_expire(struct secasvar *sav) 6787{ 6788 int satype; 6789 struct mbuf *result = NULL, *m; 6790 int len; 6791 int error = -1; 6792 struct sadb_lifetime *lt; 6793 6794 IPSEC_ASSERT (sav != NULL, ("null sav")); 6795 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6796 6797 /* set msg header */ 6798 satype = key_proto2satype(sav->sah->saidx.proto); 6799 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6800 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6801 if (!m) { 6802 error = ENOBUFS; 6803 goto fail; 6804 } 6805 result = m; 6806 6807 /* create SA extension */ 6808 m = key_setsadbsa(sav); 6809 if (!m) { 6810 error = ENOBUFS; 6811 goto fail; 6812 } 6813 m_cat(result, m); 6814 6815 /* create SA extension */ 6816 m = key_setsadbxsa2(sav->sah->saidx.mode, 6817 sav->replay ? sav->replay->count : 0, 6818 sav->sah->saidx.reqid); 6819 if (!m) { 6820 error = ENOBUFS; 6821 goto fail; 6822 } 6823 m_cat(result, m); 6824 6825 /* create lifetime extension (current and soft) */ 6826 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6827 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 6828 if (m == NULL) { 6829 error = ENOBUFS; 6830 goto fail; 6831 } 6832 m_align(m, len); 6833 m->m_len = len; 6834 bzero(mtod(m, caddr_t), len); 6835 lt = mtod(m, struct sadb_lifetime *); 6836 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6837 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6838 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6839 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6840 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6841 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6842 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6843 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6844 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6845 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6846 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6847 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6848 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6849 m_cat(result, m); 6850 6851 /* set sadb_address for source */ 6852 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6853 &sav->sah->saidx.src.sa, 6854 FULLMASK, IPSEC_ULPROTO_ANY); 6855 if (!m) { 6856 error = ENOBUFS; 6857 goto fail; 6858 } 6859 m_cat(result, m); 6860 6861 /* set sadb_address for destination */ 6862 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6863 &sav->sah->saidx.dst.sa, 6864 FULLMASK, IPSEC_ULPROTO_ANY); 6865 if (!m) { 6866 error = ENOBUFS; 6867 goto fail; 6868 } 6869 m_cat(result, m); 6870 6871 /* 6872 * XXX-BZ Handle NAT-T extensions here. 6873 */ 6874 6875 if ((result->m_flags & M_PKTHDR) == 0) { 6876 error = EINVAL; 6877 goto fail; 6878 } 6879 6880 if (result->m_len < sizeof(struct sadb_msg)) { 6881 result = m_pullup(result, sizeof(struct sadb_msg)); 6882 if (result == NULL) { 6883 error = ENOBUFS; 6884 goto fail; 6885 } 6886 } 6887 6888 result->m_pkthdr.len = 0; 6889 for (m = result; m; m = m->m_next) 6890 result->m_pkthdr.len += m->m_len; 6891 6892 mtod(result, struct sadb_msg *)->sadb_msg_len = 6893 PFKEY_UNIT64(result->m_pkthdr.len); 6894 6895 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6896 6897 fail: 6898 if (result) 6899 m_freem(result); 6900 return error; 6901} 6902 6903/* 6904 * SADB_FLUSH processing 6905 * receive 6906 * <base> 6907 * from the ikmpd, and free all entries in secastree. 6908 * and send, 6909 * <base> 6910 * to the ikmpd. 6911 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6912 * 6913 * m will always be freed. 6914 */ 6915static int 6916key_flush(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6917{ 6918 struct sadb_msg *newmsg; 6919 struct secashead *sah, *nextsah; 6920 struct secasvar *sav, *nextsav; 6921 u_int16_t proto; 6922 u_int8_t state; 6923 u_int stateidx; 6924 6925 IPSEC_ASSERT(so != NULL, ("null socket")); 6926 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6927 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6928 6929 /* map satype to proto */ 6930 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6931 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6932 __func__)); 6933 return key_senderror(so, m, EINVAL); 6934 } 6935 6936 /* no SATYPE specified, i.e. flushing all SA. */ 6937 SAHTREE_LOCK(); 6938 for (sah = LIST_FIRST(&V_sahtree); 6939 sah != NULL; 6940 sah = nextsah) { 6941 nextsah = LIST_NEXT(sah, chain); 6942 6943 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6944 && proto != sah->saidx.proto) 6945 continue; 6946 6947 for (stateidx = 0; 6948 stateidx < _ARRAYLEN(saorder_state_alive); 6949 stateidx++) { 6950 state = saorder_state_any[stateidx]; 6951 for (sav = LIST_FIRST(&sah->savtree[state]); 6952 sav != NULL; 6953 sav = nextsav) { 6954 6955 nextsav = LIST_NEXT(sav, chain); 6956 6957 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6958 KEY_FREESAV(&sav); 6959 } 6960 } 6961 6962 sah->state = SADB_SASTATE_DEAD; 6963 } 6964 SAHTREE_UNLOCK(); 6965 6966 if (m->m_len < sizeof(struct sadb_msg) || 6967 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6968 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6969 return key_senderror(so, m, ENOBUFS); 6970 } 6971 6972 if (m->m_next) 6973 m_freem(m->m_next); 6974 m->m_next = NULL; 6975 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6976 newmsg = mtod(m, struct sadb_msg *); 6977 newmsg->sadb_msg_errno = 0; 6978 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6979 6980 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6981} 6982 6983/* 6984 * SADB_DUMP processing 6985 * dump all entries including status of DEAD in SAD. 6986 * receive 6987 * <base> 6988 * from the ikmpd, and dump all secasvar leaves 6989 * and send, 6990 * <base> ..... 6991 * to the ikmpd. 6992 * 6993 * m will always be freed. 6994 */ 6995static int 6996key_dump(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 6997{ 6998 struct secashead *sah; 6999 struct secasvar *sav; 7000 u_int16_t proto; 7001 u_int stateidx; 7002 u_int8_t satype; 7003 u_int8_t state; 7004 int cnt; 7005 struct sadb_msg *newmsg; 7006 struct mbuf *n; 7007 7008 IPSEC_ASSERT(so != NULL, ("null socket")); 7009 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7010 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7011 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7012 7013 /* map satype to proto */ 7014 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 7015 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 7016 __func__)); 7017 return key_senderror(so, m, EINVAL); 7018 } 7019 7020 /* count sav entries to be sent to the userland. */ 7021 cnt = 0; 7022 SAHTREE_LOCK(); 7023 LIST_FOREACH(sah, &V_sahtree, chain) { 7024 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7025 && proto != sah->saidx.proto) 7026 continue; 7027 7028 for (stateidx = 0; 7029 stateidx < _ARRAYLEN(saorder_state_any); 7030 stateidx++) { 7031 state = saorder_state_any[stateidx]; 7032 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7033 cnt++; 7034 } 7035 } 7036 } 7037 7038 if (cnt == 0) { 7039 SAHTREE_UNLOCK(); 7040 return key_senderror(so, m, ENOENT); 7041 } 7042 7043 /* send this to the userland, one at a time. */ 7044 newmsg = NULL; 7045 LIST_FOREACH(sah, &V_sahtree, chain) { 7046 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 7047 && proto != sah->saidx.proto) 7048 continue; 7049 7050 /* map proto to satype */ 7051 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 7052 SAHTREE_UNLOCK(); 7053 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 7054 "SAD.\n", __func__)); 7055 return key_senderror(so, m, EINVAL); 7056 } 7057 7058 for (stateidx = 0; 7059 stateidx < _ARRAYLEN(saorder_state_any); 7060 stateidx++) { 7061 state = saorder_state_any[stateidx]; 7062 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7063 n = key_setdumpsa(sav, SADB_DUMP, satype, 7064 --cnt, mhp->msg->sadb_msg_pid); 7065 if (!n) { 7066 SAHTREE_UNLOCK(); 7067 return key_senderror(so, m, ENOBUFS); 7068 } 7069 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 7070 } 7071 } 7072 } 7073 SAHTREE_UNLOCK(); 7074 7075 m_freem(m); 7076 return 0; 7077} 7078 7079/* 7080 * SADB_X_PROMISC processing 7081 * 7082 * m will always be freed. 7083 */ 7084static int 7085key_promisc(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 7086{ 7087 int olen; 7088 7089 IPSEC_ASSERT(so != NULL, ("null socket")); 7090 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7091 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7092 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 7093 7094 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7095 7096 if (olen < sizeof(struct sadb_msg)) { 7097#if 1 7098 return key_senderror(so, m, EINVAL); 7099#else 7100 m_freem(m); 7101 return 0; 7102#endif 7103 } else if (olen == sizeof(struct sadb_msg)) { 7104 /* enable/disable promisc mode */ 7105 struct keycb *kp; 7106 7107 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 7108 return key_senderror(so, m, EINVAL); 7109 mhp->msg->sadb_msg_errno = 0; 7110 switch (mhp->msg->sadb_msg_satype) { 7111 case 0: 7112 case 1: 7113 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7114 break; 7115 default: 7116 return key_senderror(so, m, EINVAL); 7117 } 7118 7119 /* send the original message back to everyone */ 7120 mhp->msg->sadb_msg_errno = 0; 7121 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7122 } else { 7123 /* send packet as is */ 7124 7125 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7126 7127 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7128 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7129 } 7130} 7131 7132static int (*key_typesw[])(struct socket *, struct mbuf *, 7133 const struct sadb_msghdr *) = { 7134 NULL, /* SADB_RESERVED */ 7135 key_getspi, /* SADB_GETSPI */ 7136 key_update, /* SADB_UPDATE */ 7137 key_add, /* SADB_ADD */ 7138 key_delete, /* SADB_DELETE */ 7139 key_get, /* SADB_GET */ 7140 key_acquire2, /* SADB_ACQUIRE */ 7141 key_register, /* SADB_REGISTER */ 7142 NULL, /* SADB_EXPIRE */ 7143 key_flush, /* SADB_FLUSH */ 7144 key_dump, /* SADB_DUMP */ 7145 key_promisc, /* SADB_X_PROMISC */ 7146 NULL, /* SADB_X_PCHANGE */ 7147 key_spdadd, /* SADB_X_SPDUPDATE */ 7148 key_spdadd, /* SADB_X_SPDADD */ 7149 key_spddelete, /* SADB_X_SPDDELETE */ 7150 key_spdget, /* SADB_X_SPDGET */ 7151 NULL, /* SADB_X_SPDACQUIRE */ 7152 key_spddump, /* SADB_X_SPDDUMP */ 7153 key_spdflush, /* SADB_X_SPDFLUSH */ 7154 key_spdadd, /* SADB_X_SPDSETIDX */ 7155 NULL, /* SADB_X_SPDEXPIRE */ 7156 key_spddelete2, /* SADB_X_SPDDELETE2 */ 7157}; 7158 7159/* 7160 * parse sadb_msg buffer to process PFKEYv2, 7161 * and create a data to response if needed. 7162 * I think to be dealed with mbuf directly. 7163 * IN: 7164 * msgp : pointer to pointer to a received buffer pulluped. 7165 * This is rewrited to response. 7166 * so : pointer to socket. 7167 * OUT: 7168 * length for buffer to send to user process. 7169 */ 7170int 7171key_parse(struct mbuf *m, struct socket *so) 7172{ 7173 struct sadb_msg *msg; 7174 struct sadb_msghdr mh; 7175 u_int orglen; 7176 int error; 7177 int target; 7178 7179 IPSEC_ASSERT(so != NULL, ("null socket")); 7180 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7181 7182#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7183 KEYDEBUG(KEYDEBUG_KEY_DUMP, 7184 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 7185 kdebug_sadb(msg)); 7186#endif 7187 7188 if (m->m_len < sizeof(struct sadb_msg)) { 7189 m = m_pullup(m, sizeof(struct sadb_msg)); 7190 if (!m) 7191 return ENOBUFS; 7192 } 7193 msg = mtod(m, struct sadb_msg *); 7194 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7195 target = KEY_SENDUP_ONE; 7196 7197 if ((m->m_flags & M_PKTHDR) == 0 || 7198 m->m_pkthdr.len != m->m_pkthdr.len) { 7199 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 7200 PFKEYSTAT_INC(out_invlen); 7201 error = EINVAL; 7202 goto senderror; 7203 } 7204 7205 if (msg->sadb_msg_version != PF_KEY_V2) { 7206 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 7207 __func__, msg->sadb_msg_version)); 7208 PFKEYSTAT_INC(out_invver); 7209 error = EINVAL; 7210 goto senderror; 7211 } 7212 7213 if (msg->sadb_msg_type > SADB_MAX) { 7214 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7215 __func__, msg->sadb_msg_type)); 7216 PFKEYSTAT_INC(out_invmsgtype); 7217 error = EINVAL; 7218 goto senderror; 7219 } 7220 7221 /* for old-fashioned code - should be nuked */ 7222 if (m->m_pkthdr.len > MCLBYTES) { 7223 m_freem(m); 7224 return ENOBUFS; 7225 } 7226 if (m->m_next) { 7227 struct mbuf *n; 7228 7229 MGETHDR(n, M_NOWAIT, MT_DATA); 7230 if (n && m->m_pkthdr.len > MHLEN) { 7231 MCLGET(n, M_NOWAIT); 7232 if ((n->m_flags & M_EXT) == 0) { 7233 m_free(n); 7234 n = NULL; 7235 } 7236 } 7237 if (!n) { 7238 m_freem(m); 7239 return ENOBUFS; 7240 } 7241 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 7242 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7243 n->m_next = NULL; 7244 m_freem(m); 7245 m = n; 7246 } 7247 7248 /* align the mbuf chain so that extensions are in contiguous region. */ 7249 error = key_align(m, &mh); 7250 if (error) 7251 return error; 7252 7253 msg = mh.msg; 7254 7255 /* check SA type */ 7256 switch (msg->sadb_msg_satype) { 7257 case SADB_SATYPE_UNSPEC: 7258 switch (msg->sadb_msg_type) { 7259 case SADB_GETSPI: 7260 case SADB_UPDATE: 7261 case SADB_ADD: 7262 case SADB_DELETE: 7263 case SADB_GET: 7264 case SADB_ACQUIRE: 7265 case SADB_EXPIRE: 7266 ipseclog((LOG_DEBUG, "%s: must specify satype " 7267 "when msg type=%u.\n", __func__, 7268 msg->sadb_msg_type)); 7269 PFKEYSTAT_INC(out_invsatype); 7270 error = EINVAL; 7271 goto senderror; 7272 } 7273 break; 7274 case SADB_SATYPE_AH: 7275 case SADB_SATYPE_ESP: 7276 case SADB_X_SATYPE_IPCOMP: 7277 case SADB_X_SATYPE_TCPSIGNATURE: 7278 switch (msg->sadb_msg_type) { 7279 case SADB_X_SPDADD: 7280 case SADB_X_SPDDELETE: 7281 case SADB_X_SPDGET: 7282 case SADB_X_SPDDUMP: 7283 case SADB_X_SPDFLUSH: 7284 case SADB_X_SPDSETIDX: 7285 case SADB_X_SPDUPDATE: 7286 case SADB_X_SPDDELETE2: 7287 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 7288 __func__, msg->sadb_msg_type)); 7289 PFKEYSTAT_INC(out_invsatype); 7290 error = EINVAL; 7291 goto senderror; 7292 } 7293 break; 7294 case SADB_SATYPE_RSVP: 7295 case SADB_SATYPE_OSPFV2: 7296 case SADB_SATYPE_RIPV2: 7297 case SADB_SATYPE_MIP: 7298 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 7299 __func__, msg->sadb_msg_satype)); 7300 PFKEYSTAT_INC(out_invsatype); 7301 error = EOPNOTSUPP; 7302 goto senderror; 7303 case 1: /* XXX: What does it do? */ 7304 if (msg->sadb_msg_type == SADB_X_PROMISC) 7305 break; 7306 /*FALLTHROUGH*/ 7307 default: 7308 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 7309 __func__, msg->sadb_msg_satype)); 7310 PFKEYSTAT_INC(out_invsatype); 7311 error = EINVAL; 7312 goto senderror; 7313 } 7314 7315 /* check field of upper layer protocol and address family */ 7316 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 7317 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7318 struct sadb_address *src0, *dst0; 7319 u_int plen; 7320 7321 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7322 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7323 7324 /* check upper layer protocol */ 7325 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7326 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 7327 "mismatched.\n", __func__)); 7328 PFKEYSTAT_INC(out_invaddr); 7329 error = EINVAL; 7330 goto senderror; 7331 } 7332 7333 /* check family */ 7334 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7335 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7336 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 7337 __func__)); 7338 PFKEYSTAT_INC(out_invaddr); 7339 error = EINVAL; 7340 goto senderror; 7341 } 7342 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7343 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7344 ipseclog((LOG_DEBUG, "%s: address struct size " 7345 "mismatched.\n", __func__)); 7346 PFKEYSTAT_INC(out_invaddr); 7347 error = EINVAL; 7348 goto senderror; 7349 } 7350 7351 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7352 case AF_INET: 7353 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7354 sizeof(struct sockaddr_in)) { 7355 PFKEYSTAT_INC(out_invaddr); 7356 error = EINVAL; 7357 goto senderror; 7358 } 7359 break; 7360 case AF_INET6: 7361 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7362 sizeof(struct sockaddr_in6)) { 7363 PFKEYSTAT_INC(out_invaddr); 7364 error = EINVAL; 7365 goto senderror; 7366 } 7367 break; 7368 default: 7369 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 7370 __func__)); 7371 PFKEYSTAT_INC(out_invaddr); 7372 error = EAFNOSUPPORT; 7373 goto senderror; 7374 } 7375 7376 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7377 case AF_INET: 7378 plen = sizeof(struct in_addr) << 3; 7379 break; 7380 case AF_INET6: 7381 plen = sizeof(struct in6_addr) << 3; 7382 break; 7383 default: 7384 plen = 0; /*fool gcc*/ 7385 break; 7386 } 7387 7388 /* check max prefix length */ 7389 if (src0->sadb_address_prefixlen > plen || 7390 dst0->sadb_address_prefixlen > plen) { 7391 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 7392 __func__)); 7393 PFKEYSTAT_INC(out_invaddr); 7394 error = EINVAL; 7395 goto senderror; 7396 } 7397 7398 /* 7399 * prefixlen == 0 is valid because there can be a case when 7400 * all addresses are matched. 7401 */ 7402 } 7403 7404 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 7405 key_typesw[msg->sadb_msg_type] == NULL) { 7406 PFKEYSTAT_INC(out_invmsgtype); 7407 error = EINVAL; 7408 goto senderror; 7409 } 7410 7411 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 7412 7413senderror: 7414 msg->sadb_msg_errno = error; 7415 return key_sendup_mbuf(so, m, target); 7416} 7417 7418static int 7419key_senderror(struct socket *so, struct mbuf *m, int code) 7420{ 7421 struct sadb_msg *msg; 7422 7423 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7424 ("mbuf too small, len %u", m->m_len)); 7425 7426 msg = mtod(m, struct sadb_msg *); 7427 msg->sadb_msg_errno = code; 7428 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7429} 7430 7431/* 7432 * set the pointer to each header into message buffer. 7433 * m will be freed on error. 7434 * XXX larger-than-MCLBYTES extension? 7435 */ 7436static int 7437key_align(struct mbuf *m, struct sadb_msghdr *mhp) 7438{ 7439 struct mbuf *n; 7440 struct sadb_ext *ext; 7441 size_t off, end; 7442 int extlen; 7443 int toff; 7444 7445 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7446 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7447 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7448 ("mbuf too small, len %u", m->m_len)); 7449 7450 /* initialize */ 7451 bzero(mhp, sizeof(*mhp)); 7452 7453 mhp->msg = mtod(m, struct sadb_msg *); 7454 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7455 7456 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7457 extlen = end; /*just in case extlen is not updated*/ 7458 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7459 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7460 if (!n) { 7461 /* m is already freed */ 7462 return ENOBUFS; 7463 } 7464 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7465 7466 /* set pointer */ 7467 switch (ext->sadb_ext_type) { 7468 case SADB_EXT_SA: 7469 case SADB_EXT_ADDRESS_SRC: 7470 case SADB_EXT_ADDRESS_DST: 7471 case SADB_EXT_ADDRESS_PROXY: 7472 case SADB_EXT_LIFETIME_CURRENT: 7473 case SADB_EXT_LIFETIME_HARD: 7474 case SADB_EXT_LIFETIME_SOFT: 7475 case SADB_EXT_KEY_AUTH: 7476 case SADB_EXT_KEY_ENCRYPT: 7477 case SADB_EXT_IDENTITY_SRC: 7478 case SADB_EXT_IDENTITY_DST: 7479 case SADB_EXT_SENSITIVITY: 7480 case SADB_EXT_PROPOSAL: 7481 case SADB_EXT_SUPPORTED_AUTH: 7482 case SADB_EXT_SUPPORTED_ENCRYPT: 7483 case SADB_EXT_SPIRANGE: 7484 case SADB_X_EXT_POLICY: 7485 case SADB_X_EXT_SA2: 7486#ifdef IPSEC_NAT_T 7487 case SADB_X_EXT_NAT_T_TYPE: 7488 case SADB_X_EXT_NAT_T_SPORT: 7489 case SADB_X_EXT_NAT_T_DPORT: 7490 case SADB_X_EXT_NAT_T_OAI: 7491 case SADB_X_EXT_NAT_T_OAR: 7492 case SADB_X_EXT_NAT_T_FRAG: 7493#endif 7494 /* duplicate check */ 7495 /* 7496 * XXX Are there duplication payloads of either 7497 * KEY_AUTH or KEY_ENCRYPT ? 7498 */ 7499 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7500 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7501 "%u\n", __func__, ext->sadb_ext_type)); 7502 m_freem(m); 7503 PFKEYSTAT_INC(out_dupext); 7504 return EINVAL; 7505 } 7506 break; 7507 default: 7508 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7509 __func__, ext->sadb_ext_type)); 7510 m_freem(m); 7511 PFKEYSTAT_INC(out_invexttype); 7512 return EINVAL; 7513 } 7514 7515 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7516 7517 if (key_validate_ext(ext, extlen)) { 7518 m_freem(m); 7519 PFKEYSTAT_INC(out_invlen); 7520 return EINVAL; 7521 } 7522 7523 n = m_pulldown(m, off, extlen, &toff); 7524 if (!n) { 7525 /* m is already freed */ 7526 return ENOBUFS; 7527 } 7528 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7529 7530 mhp->ext[ext->sadb_ext_type] = ext; 7531 mhp->extoff[ext->sadb_ext_type] = off; 7532 mhp->extlen[ext->sadb_ext_type] = extlen; 7533 } 7534 7535 if (off != end) { 7536 m_freem(m); 7537 PFKEYSTAT_INC(out_invlen); 7538 return EINVAL; 7539 } 7540 7541 return 0; 7542} 7543 7544static int 7545key_validate_ext(const struct sadb_ext *ext, int len) 7546{ 7547 const struct sockaddr *sa; 7548 enum { NONE, ADDR } checktype = NONE; 7549 int baselen = 0; 7550 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7551 7552 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7553 return EINVAL; 7554 7555 /* if it does not match minimum/maximum length, bail */ 7556 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7557 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7558 return EINVAL; 7559 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7560 return EINVAL; 7561 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7562 return EINVAL; 7563 7564 /* more checks based on sadb_ext_type XXX need more */ 7565 switch (ext->sadb_ext_type) { 7566 case SADB_EXT_ADDRESS_SRC: 7567 case SADB_EXT_ADDRESS_DST: 7568 case SADB_EXT_ADDRESS_PROXY: 7569 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7570 checktype = ADDR; 7571 break; 7572 case SADB_EXT_IDENTITY_SRC: 7573 case SADB_EXT_IDENTITY_DST: 7574 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7575 SADB_X_IDENTTYPE_ADDR) { 7576 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7577 checktype = ADDR; 7578 } else 7579 checktype = NONE; 7580 break; 7581 default: 7582 checktype = NONE; 7583 break; 7584 } 7585 7586 switch (checktype) { 7587 case NONE: 7588 break; 7589 case ADDR: 7590 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7591 if (len < baselen + sal) 7592 return EINVAL; 7593 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7594 return EINVAL; 7595 break; 7596 } 7597 7598 return 0; 7599} 7600 7601void 7602key_init(void) 7603{ 7604 int i; 7605 7606 for (i = 0; i < IPSEC_DIR_MAX; i++) 7607 LIST_INIT(&V_sptree[i]); 7608 7609 LIST_INIT(&V_sahtree); 7610 7611 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7612 LIST_INIT(&V_regtree[i]); 7613 7614 LIST_INIT(&V_acqtree); 7615 LIST_INIT(&V_spacqtree); 7616 7617 /* system default */ 7618 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7619 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7620 7621 if (!IS_DEFAULT_VNET(curvnet)) 7622 return; 7623 7624 SPTREE_LOCK_INIT(); 7625 REGTREE_LOCK_INIT(); 7626 SAHTREE_LOCK_INIT(); 7627 ACQ_LOCK_INIT(); 7628 SPACQ_LOCK_INIT(); 7629 7630#ifndef IPSEC_DEBUG2 7631 timeout((void *)key_timehandler, (void *)0, hz); 7632#endif /*IPSEC_DEBUG2*/ 7633 7634 /* initialize key statistics */ 7635 keystat.getspi_count = 1; 7636 7637 printf("IPsec: Initialized Security Association Processing.\n"); 7638} 7639 7640#ifdef VIMAGE 7641void 7642key_destroy(void) 7643{ 7644 struct secpolicy *sp, *nextsp; 7645 struct secacq *acq, *nextacq; 7646 struct secspacq *spacq, *nextspacq; 7647 struct secashead *sah, *nextsah; 7648 struct secreg *reg; 7649 int i; 7650 7651 SPTREE_LOCK(); 7652 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7653 for (sp = LIST_FIRST(&V_sptree[i]); 7654 sp != NULL; sp = nextsp) { 7655 nextsp = LIST_NEXT(sp, chain); 7656 if (__LIST_CHAINED(sp)) { 7657 LIST_REMOVE(sp, chain); 7658 free(sp, M_IPSEC_SP); 7659 } 7660 } 7661 } 7662 SPTREE_UNLOCK(); 7663 7664 SAHTREE_LOCK(); 7665 for (sah = LIST_FIRST(&V_sahtree); sah != NULL; sah = nextsah) { 7666 nextsah = LIST_NEXT(sah, chain); 7667 if (__LIST_CHAINED(sah)) { 7668 LIST_REMOVE(sah, chain); 7669 free(sah, M_IPSEC_SAH); 7670 } 7671 } 7672 SAHTREE_UNLOCK(); 7673 7674 REGTREE_LOCK(); 7675 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7676 LIST_FOREACH(reg, &V_regtree[i], chain) { 7677 if (__LIST_CHAINED(reg)) { 7678 LIST_REMOVE(reg, chain); 7679 free(reg, M_IPSEC_SAR); 7680 break; 7681 } 7682 } 7683 } 7684 REGTREE_UNLOCK(); 7685 7686 ACQ_LOCK(); 7687 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 7688 nextacq = LIST_NEXT(acq, chain); 7689 if (__LIST_CHAINED(acq)) { 7690 LIST_REMOVE(acq, chain); 7691 free(acq, M_IPSEC_SAQ); 7692 } 7693 } 7694 ACQ_UNLOCK(); 7695 7696 SPACQ_LOCK(); 7697 for (spacq = LIST_FIRST(&V_spacqtree); spacq != NULL; 7698 spacq = nextspacq) { 7699 nextspacq = LIST_NEXT(spacq, chain); 7700 if (__LIST_CHAINED(spacq)) { 7701 LIST_REMOVE(spacq, chain); 7702 free(spacq, M_IPSEC_SAQ); 7703 } 7704 } 7705 SPACQ_UNLOCK(); 7706} 7707#endif 7708 7709/* 7710 * XXX: maybe This function is called after INBOUND IPsec processing. 7711 * 7712 * Special check for tunnel-mode packets. 7713 * We must make some checks for consistency between inner and outer IP header. 7714 * 7715 * xxx more checks to be provided 7716 */ 7717int 7718key_checktunnelsanity(struct secasvar *sav, u_int family, caddr_t src, 7719 caddr_t dst) 7720{ 7721 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7722 7723 /* XXX: check inner IP header */ 7724 7725 return 1; 7726} 7727 7728/* record data transfer on SA, and update timestamps */ 7729void 7730key_sa_recordxfer(struct secasvar *sav, struct mbuf *m) 7731{ 7732 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7733 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7734 if (!sav->lft_c) 7735 return; 7736 7737 /* 7738 * XXX Currently, there is a difference of bytes size 7739 * between inbound and outbound processing. 7740 */ 7741 sav->lft_c->bytes += m->m_pkthdr.len; 7742 /* to check bytes lifetime is done in key_timehandler(). */ 7743 7744 /* 7745 * We use the number of packets as the unit of 7746 * allocations. We increment the variable 7747 * whenever {esp,ah}_{in,out}put is called. 7748 */ 7749 sav->lft_c->allocations++; 7750 /* XXX check for expires? */ 7751 7752 /* 7753 * NOTE: We record CURRENT usetime by using wall clock, 7754 * in seconds. HARD and SOFT lifetime are measured by the time 7755 * difference (again in seconds) from usetime. 7756 * 7757 * usetime 7758 * v expire expire 7759 * -----+-----+--------+---> t 7760 * <--------------> HARD 7761 * <-----> SOFT 7762 */ 7763 sav->lft_c->usetime = time_second; 7764 /* XXX check for expires? */ 7765 7766 return; 7767} 7768 7769static void 7770key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7771{ 7772 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7773 SAHTREE_LOCK_ASSERT(); 7774 7775 if (sav->state != state) { 7776 if (__LIST_CHAINED(sav)) 7777 LIST_REMOVE(sav, chain); 7778 sav->state = state; 7779 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7780 } 7781} 7782 7783void 7784key_sa_stir_iv(struct secasvar *sav) 7785{ 7786 7787 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7788 key_randomfill(sav->iv, sav->ivlen); 7789} 7790 7791/* 7792 * Take one of the kernel's security keys and convert it into a PF_KEY 7793 * structure within an mbuf, suitable for sending up to a waiting 7794 * application in user land. 7795 * 7796 * IN: 7797 * src: A pointer to a kernel security key. 7798 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7799 * OUT: 7800 * a valid mbuf or NULL indicating an error 7801 * 7802 */ 7803 7804static struct mbuf * 7805key_setkey(struct seckey *src, u_int16_t exttype) 7806{ 7807 struct mbuf *m; 7808 struct sadb_key *p; 7809 int len; 7810 7811 if (src == NULL) 7812 return NULL; 7813 7814 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7815 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 7816 if (m == NULL) 7817 return NULL; 7818 m_align(m, len); 7819 m->m_len = len; 7820 p = mtod(m, struct sadb_key *); 7821 bzero(p, len); 7822 p->sadb_key_len = PFKEY_UNIT64(len); 7823 p->sadb_key_exttype = exttype; 7824 p->sadb_key_bits = src->bits; 7825 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7826 7827 return m; 7828} 7829 7830/* 7831 * Take one of the kernel's lifetime data structures and convert it 7832 * into a PF_KEY structure within an mbuf, suitable for sending up to 7833 * a waiting application in user land. 7834 * 7835 * IN: 7836 * src: A pointer to a kernel lifetime structure. 7837 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7838 * data structures for more information. 7839 * OUT: 7840 * a valid mbuf or NULL indicating an error 7841 * 7842 */ 7843 7844static struct mbuf * 7845key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7846{ 7847 struct mbuf *m = NULL; 7848 struct sadb_lifetime *p; 7849 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7850 7851 if (src == NULL) 7852 return NULL; 7853 7854 m = m_get2(len, M_NOWAIT, MT_DATA, 0); 7855 if (m == NULL) 7856 return m; 7857 m_align(m, len); 7858 m->m_len = len; 7859 p = mtod(m, struct sadb_lifetime *); 7860 7861 bzero(p, len); 7862 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7863 p->sadb_lifetime_exttype = exttype; 7864 p->sadb_lifetime_allocations = src->allocations; 7865 p->sadb_lifetime_bytes = src->bytes; 7866 p->sadb_lifetime_addtime = src->addtime; 7867 p->sadb_lifetime_usetime = src->usetime; 7868 7869 return m; 7870 7871} 7872