key.c revision 192882
1/* $FreeBSD: head/sys/netipsec/key.c 192882 2009-05-27 09:44:14Z vanhu $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59#include <sys/vimage.h> 60 61#include <net/if.h> 62#include <net/route.h> 63#include <net/raw_cb.h> 64 65#include <netinet/in.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#include <netinet/in_var.h> 69 70#ifdef INET6 71#include <netinet/ip6.h> 72#include <netinet6/in6_var.h> 73#include <netinet6/ip6_var.h> 74#endif /* INET6 */ 75 76#ifdef INET 77#include <netinet/in_pcb.h> 78#include <netinet/vinet.h> 79#endif 80#ifdef INET6 81#include <netinet6/in6_pcb.h> 82#include <netinet6/vinet6.h> 83#endif /* INET6 */ 84 85#include <net/pfkeyv2.h> 86#include <netipsec/keydb.h> 87#include <netipsec/key.h> 88#include <netipsec/keysock.h> 89#include <netipsec/key_debug.h> 90 91#include <netipsec/ipsec.h> 92#ifdef INET6 93#include <netipsec/ipsec6.h> 94#endif 95 96#include <netipsec/xform.h> 97 98#include <machine/stdarg.h> 99 100/* randomness */ 101#include <sys/random.h> 102#include <sys/vimage.h> 103 104#define FULLMASK 0xff 105#define _BITS(bytes) ((bytes) << 3) 106 107/* 108 * Note on SA reference counting: 109 * - SAs that are not in DEAD state will have (total external reference + 1) 110 * following value in reference count field. they cannot be freed and are 111 * referenced from SA header. 112 * - SAs that are in DEAD state will have (total external reference) 113 * in reference count field. they are ready to be freed. reference from 114 * SA header will be removed in key_delsav(), when the reference count 115 * field hits 0 (= no external reference other than from SA header. 116 */ 117 118#ifdef VIMAGE_GLOBALS 119u_int32_t key_debug_level; 120static u_int key_spi_trycnt; 121static u_int32_t key_spi_minval; 122static u_int32_t key_spi_maxval; 123static u_int32_t policy_id; 124static u_int key_int_random; 125static u_int key_larval_lifetime; 126static int key_blockacq_count; 127static int key_blockacq_lifetime; 128static int key_preferred_oldsa; 129 130static u_int32_t acq_seq; 131 132static int ipsec_esp_keymin; 133static int ipsec_esp_auth; 134static int ipsec_ah_keymin; 135 136static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 137static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 138static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 139static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 140static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 141#endif /* VIMAGE_GLOBALS */ 142 143static struct mtx sptree_lock; 144#define SPTREE_LOCK_INIT() \ 145 mtx_init(&sptree_lock, "sptree", \ 146 "fast ipsec security policy database", MTX_DEF) 147#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 148#define SPTREE_LOCK() mtx_lock(&sptree_lock) 149#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 150#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 151 152static struct mtx sahtree_lock; 153#define SAHTREE_LOCK_INIT() \ 154 mtx_init(&sahtree_lock, "sahtree", \ 155 "fast ipsec security association database", MTX_DEF) 156#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 157#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 158#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 159#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 160 161 /* registed list */ 162static struct mtx regtree_lock; 163#define REGTREE_LOCK_INIT() \ 164 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 165#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 166#define REGTREE_LOCK() mtx_lock(®tree_lock) 167#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 168#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 169 170static struct mtx acq_lock; 171#define ACQ_LOCK_INIT() \ 172 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 173#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 174#define ACQ_LOCK() mtx_lock(&acq_lock) 175#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 176#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 177 178static struct mtx spacq_lock; 179#define SPACQ_LOCK_INIT() \ 180 mtx_init(&spacq_lock, "spacqtree", \ 181 "fast ipsec security policy acquire list", MTX_DEF) 182#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 183#define SPACQ_LOCK() mtx_lock(&spacq_lock) 184#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 185#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 186 187/* search order for SAs */ 188static const u_int saorder_state_valid_prefer_old[] = { 189 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 190}; 191static const u_int saorder_state_valid_prefer_new[] = { 192 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 193}; 194static const u_int saorder_state_alive[] = { 195 /* except DEAD */ 196 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 197}; 198static const u_int saorder_state_any[] = { 199 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 200 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 201}; 202 203static const int minsize[] = { 204 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 205 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 206 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 207 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 208 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 209 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 210 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 211 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 212 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 213 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 214 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 215 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 216 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 217 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 218 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 219 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 220 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 221 0, /* SADB_X_EXT_KMPRIVATE */ 222 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 223 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 224}; 225static const int maxsize[] = { 226 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 227 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 228 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 229 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 230 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 231 0, /* SADB_EXT_ADDRESS_SRC */ 232 0, /* SADB_EXT_ADDRESS_DST */ 233 0, /* SADB_EXT_ADDRESS_PROXY */ 234 0, /* SADB_EXT_KEY_AUTH */ 235 0, /* SADB_EXT_KEY_ENCRYPT */ 236 0, /* SADB_EXT_IDENTITY_SRC */ 237 0, /* SADB_EXT_IDENTITY_DST */ 238 0, /* SADB_EXT_SENSITIVITY */ 239 0, /* SADB_EXT_PROPOSAL */ 240 0, /* SADB_EXT_SUPPORTED_AUTH */ 241 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 242 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 243 0, /* SADB_X_EXT_KMPRIVATE */ 244 0, /* SADB_X_EXT_POLICY */ 245 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 246}; 247 248#ifdef SYSCTL_DECL 249SYSCTL_DECL(_net_key); 250#endif 251 252SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_DEBUG_LEVEL, debug, 253 CTLFLAG_RW, key_debug_level, 0, ""); 254 255/* max count of trial for the decision of spi value */ 256SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_SPI_TRY, spi_trycnt, 257 CTLFLAG_RW, key_spi_trycnt, 0, ""); 258 259/* minimum spi value to allocate automatically. */ 260SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MIN_VALUE, 261 spi_minval, CTLFLAG_RW, key_spi_minval, 0, ""); 262 263/* maximun spi value to allocate automatically. */ 264SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MAX_VALUE, 265 spi_maxval, CTLFLAG_RW, key_spi_maxval, 0, ""); 266 267/* interval to initialize randseed */ 268SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_RANDOM_INT, 269 int_random, CTLFLAG_RW, key_int_random, 0, ""); 270 271/* lifetime for larval SA */ 272SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_LARVAL_LIFETIME, 273 larval_lifetime, CTLFLAG_RW, key_larval_lifetime, 0, ""); 274 275/* counter for blocking to send SADB_ACQUIRE to IKEd */ 276SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_COUNT, 277 blockacq_count, CTLFLAG_RW, key_blockacq_count, 0, ""); 278 279/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 280SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_LIFETIME, 281 blockacq_lifetime, CTLFLAG_RW, key_blockacq_lifetime, 0, ""); 282 283/* ESP auth */ 284SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_AUTH, esp_auth, 285 CTLFLAG_RW, ipsec_esp_auth, 0, ""); 286 287/* minimum ESP key length */ 288SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_KEYMIN, 289 esp_keymin, CTLFLAG_RW, ipsec_esp_keymin, 0, ""); 290 291/* minimum AH key length */ 292SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_AH_KEYMIN, ah_keymin, 293 CTLFLAG_RW, ipsec_ah_keymin, 0, ""); 294 295/* perfered old SA rather than new SA */ 296SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_PREFERED_OLDSA, 297 preferred_oldsa, CTLFLAG_RW, key_preferred_oldsa, 0, ""); 298 299#define __LIST_CHAINED(elm) \ 300 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 301#define LIST_INSERT_TAIL(head, elm, type, field) \ 302do {\ 303 struct type *curelm = LIST_FIRST(head); \ 304 if (curelm == NULL) {\ 305 LIST_INSERT_HEAD(head, elm, field); \ 306 } else { \ 307 while (LIST_NEXT(curelm, field)) \ 308 curelm = LIST_NEXT(curelm, field);\ 309 LIST_INSERT_AFTER(curelm, elm, field);\ 310 }\ 311} while (0) 312 313#define KEY_CHKSASTATE(head, sav, name) \ 314do { \ 315 if ((head) != (sav)) { \ 316 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 317 (name), (head), (sav))); \ 318 continue; \ 319 } \ 320} while (0) 321 322#define KEY_CHKSPDIR(head, sp, name) \ 323do { \ 324 if ((head) != (sp)) { \ 325 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 326 "anyway continue.\n", \ 327 (name), (head), (sp))); \ 328 } \ 329} while (0) 330 331MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 332MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 333MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 334MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 335MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 336MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 337MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 338 339/* 340 * set parameters into secpolicyindex buffer. 341 * Must allocate secpolicyindex buffer passed to this function. 342 */ 343#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 344do { \ 345 bzero((idx), sizeof(struct secpolicyindex)); \ 346 (idx)->dir = (_dir); \ 347 (idx)->prefs = (ps); \ 348 (idx)->prefd = (pd); \ 349 (idx)->ul_proto = (ulp); \ 350 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 351 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 352} while (0) 353 354/* 355 * set parameters into secasindex buffer. 356 * Must allocate secasindex buffer before calling this function. 357 */ 358#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 359do { \ 360 bzero((idx), sizeof(struct secasindex)); \ 361 (idx)->proto = (p); \ 362 (idx)->mode = (m); \ 363 (idx)->reqid = (r); \ 364 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 365 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 366} while (0) 367 368/* key statistics */ 369struct _keystat { 370 u_long getspi_count; /* the avarage of count to try to get new SPI */ 371} keystat; 372 373struct sadb_msghdr { 374 struct sadb_msg *msg; 375 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 376 int extoff[SADB_EXT_MAX + 1]; 377 int extlen[SADB_EXT_MAX + 1]; 378}; 379 380static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 381static void key_freesp_so __P((struct secpolicy **)); 382static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 383static void key_delsp __P((struct secpolicy *)); 384static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 385static void _key_delsp(struct secpolicy *sp); 386static struct secpolicy *key_getspbyid __P((u_int32_t)); 387static u_int32_t key_newreqid __P((void)); 388static struct mbuf *key_gather_mbuf __P((struct mbuf *, 389 const struct sadb_msghdr *, int, int, ...)); 390static int key_spdadd __P((struct socket *, struct mbuf *, 391 const struct sadb_msghdr *)); 392static u_int32_t key_getnewspid __P((void)); 393static int key_spddelete __P((struct socket *, struct mbuf *, 394 const struct sadb_msghdr *)); 395static int key_spddelete2 __P((struct socket *, struct mbuf *, 396 const struct sadb_msghdr *)); 397static int key_spdget __P((struct socket *, struct mbuf *, 398 const struct sadb_msghdr *)); 399static int key_spdflush __P((struct socket *, struct mbuf *, 400 const struct sadb_msghdr *)); 401static int key_spddump __P((struct socket *, struct mbuf *, 402 const struct sadb_msghdr *)); 403static struct mbuf *key_setdumpsp __P((struct secpolicy *, 404 u_int8_t, u_int32_t, u_int32_t)); 405static u_int key_getspreqmsglen __P((struct secpolicy *)); 406static int key_spdexpire __P((struct secpolicy *)); 407static struct secashead *key_newsah __P((struct secasindex *)); 408static void key_delsah __P((struct secashead *)); 409static struct secasvar *key_newsav __P((struct mbuf *, 410 const struct sadb_msghdr *, struct secashead *, int *, 411 const char*, int)); 412#define KEY_NEWSAV(m, sadb, sah, e) \ 413 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 414static void key_delsav __P((struct secasvar *)); 415static struct secashead *key_getsah __P((struct secasindex *)); 416static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 417static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 418static int key_setsaval __P((struct secasvar *, struct mbuf *, 419 const struct sadb_msghdr *)); 420static int key_mature __P((struct secasvar *)); 421static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 422 u_int8_t, u_int32_t, u_int32_t)); 423static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 424 u_int32_t, pid_t, u_int16_t)); 425static struct mbuf *key_setsadbsa __P((struct secasvar *)); 426static struct mbuf *key_setsadbaddr __P((u_int16_t, 427 const struct sockaddr *, u_int8_t, u_int16_t)); 428static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 429static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 430 u_int32_t)); 431static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 432 struct malloc_type *); 433static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 434 struct malloc_type *type); 435#ifdef INET6 436static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 437#endif 438 439/* flags for key_cmpsaidx() */ 440#define CMP_HEAD 1 /* protocol, addresses. */ 441#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 442#define CMP_REQID 3 /* additionally HEAD, reaid. */ 443#define CMP_EXACTLY 4 /* all elements. */ 444static int key_cmpsaidx 445 __P((const struct secasindex *, const struct secasindex *, int)); 446 447static int key_cmpspidx_exactly 448 __P((struct secpolicyindex *, struct secpolicyindex *)); 449static int key_cmpspidx_withmask 450 __P((struct secpolicyindex *, struct secpolicyindex *)); 451static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 452static int key_bbcmp __P((const void *, const void *, u_int)); 453static u_int16_t key_satype2proto __P((u_int8_t)); 454static u_int8_t key_proto2satype __P((u_int16_t)); 455 456static int key_getspi __P((struct socket *, struct mbuf *, 457 const struct sadb_msghdr *)); 458static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 459 struct secasindex *)); 460static int key_update __P((struct socket *, struct mbuf *, 461 const struct sadb_msghdr *)); 462#ifdef IPSEC_DOSEQCHECK 463static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 464#endif 465static int key_add __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467static int key_setident __P((struct secashead *, struct mbuf *, 468 const struct sadb_msghdr *)); 469static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 470 const struct sadb_msghdr *)); 471static int key_delete __P((struct socket *, struct mbuf *, 472 const struct sadb_msghdr *)); 473static int key_get __P((struct socket *, struct mbuf *, 474 const struct sadb_msghdr *)); 475 476static void key_getcomb_setlifetime __P((struct sadb_comb *)); 477static struct mbuf *key_getcomb_esp __P((void)); 478static struct mbuf *key_getcomb_ah __P((void)); 479static struct mbuf *key_getcomb_ipcomp __P((void)); 480static struct mbuf *key_getprop __P((const struct secasindex *)); 481 482static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 483static struct secacq *key_newacq __P((const struct secasindex *)); 484static struct secacq *key_getacq __P((const struct secasindex *)); 485static struct secacq *key_getacqbyseq __P((u_int32_t)); 486static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 487static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 488static int key_acquire2 __P((struct socket *, struct mbuf *, 489 const struct sadb_msghdr *)); 490static int key_register __P((struct socket *, struct mbuf *, 491 const struct sadb_msghdr *)); 492static int key_expire __P((struct secasvar *)); 493static int key_flush __P((struct socket *, struct mbuf *, 494 const struct sadb_msghdr *)); 495static int key_dump __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497static int key_promisc __P((struct socket *, struct mbuf *, 498 const struct sadb_msghdr *)); 499static int key_senderror __P((struct socket *, struct mbuf *, int)); 500static int key_validate_ext __P((const struct sadb_ext *, int)); 501static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 502static struct mbuf *key_setlifetime(struct seclifetime *src, 503 u_int16_t exttype); 504static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 505 506#if 0 507static const char *key_getfqdn __P((void)); 508static const char *key_getuserfqdn __P((void)); 509#endif 510static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 511static struct mbuf *key_alloc_mbuf __P((int)); 512 513static __inline void 514sa_initref(struct secasvar *sav) 515{ 516 517 refcount_init(&sav->refcnt, 1); 518} 519static __inline void 520sa_addref(struct secasvar *sav) 521{ 522 523 refcount_acquire(&sav->refcnt); 524 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 525} 526static __inline int 527sa_delref(struct secasvar *sav) 528{ 529 530 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 531 return (refcount_release(&sav->refcnt)); 532} 533 534#define SP_ADDREF(p) do { \ 535 (p)->refcnt++; \ 536 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 537} while (0) 538#define SP_DELREF(p) do { \ 539 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 540 (p)->refcnt--; \ 541} while (0) 542 543 544/* 545 * Update the refcnt while holding the SPTREE lock. 546 */ 547void 548key_addref(struct secpolicy *sp) 549{ 550 SPTREE_LOCK(); 551 SP_ADDREF(sp); 552 SPTREE_UNLOCK(); 553} 554 555/* 556 * Return 0 when there are known to be no SP's for the specified 557 * direction. Otherwise return 1. This is used by IPsec code 558 * to optimize performance. 559 */ 560int 561key_havesp(u_int dir) 562{ 563 INIT_VNET_IPSEC(curvnet); 564 565 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 566 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 567} 568 569/* %%% IPsec policy management */ 570/* 571 * allocating a SP for OUTBOUND or INBOUND packet. 572 * Must call key_freesp() later. 573 * OUT: NULL: not found 574 * others: found and return the pointer. 575 */ 576struct secpolicy * 577key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 578{ 579 INIT_VNET_IPSEC(curvnet); 580 struct secpolicy *sp; 581 582 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 583 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 584 ("invalid direction %u", dir)); 585 586 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 587 printf("DP %s from %s:%u\n", __func__, where, tag)); 588 589 /* get a SP entry */ 590 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 591 printf("*** objects\n"); 592 kdebug_secpolicyindex(spidx)); 593 594 SPTREE_LOCK(); 595 LIST_FOREACH(sp, &V_sptree[dir], chain) { 596 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 597 printf("*** in SPD\n"); 598 kdebug_secpolicyindex(&sp->spidx)); 599 600 if (sp->state == IPSEC_SPSTATE_DEAD) 601 continue; 602 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 603 goto found; 604 } 605 sp = NULL; 606found: 607 if (sp) { 608 /* sanity check */ 609 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 610 611 /* found a SPD entry */ 612 sp->lastused = time_second; 613 SP_ADDREF(sp); 614 } 615 SPTREE_UNLOCK(); 616 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 619 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 620 return sp; 621} 622 623/* 624 * allocating a SP for OUTBOUND or INBOUND packet. 625 * Must call key_freesp() later. 626 * OUT: NULL: not found 627 * others: found and return the pointer. 628 */ 629struct secpolicy * 630key_allocsp2(u_int32_t spi, 631 union sockaddr_union *dst, 632 u_int8_t proto, 633 u_int dir, 634 const char* where, int tag) 635{ 636 INIT_VNET_IPSEC(curvnet); 637 struct secpolicy *sp; 638 639 IPSEC_ASSERT(dst != NULL, ("null dst")); 640 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 641 ("invalid direction %u", dir)); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 644 printf("DP %s from %s:%u\n", __func__, where, tag)); 645 646 /* get a SP entry */ 647 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 648 printf("*** objects\n"); 649 printf("spi %u proto %u dir %u\n", spi, proto, dir); 650 kdebug_sockaddr(&dst->sa)); 651 652 SPTREE_LOCK(); 653 LIST_FOREACH(sp, &V_sptree[dir], chain) { 654 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 655 printf("*** in SPD\n"); 656 kdebug_secpolicyindex(&sp->spidx)); 657 658 if (sp->state == IPSEC_SPSTATE_DEAD) 659 continue; 660 /* compare simple values, then dst address */ 661 if (sp->spidx.ul_proto != proto) 662 continue; 663 /* NB: spi's must exist and match */ 664 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 665 continue; 666 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 667 goto found; 668 } 669 sp = NULL; 670found: 671 if (sp) { 672 /* sanity check */ 673 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 674 675 /* found a SPD entry */ 676 sp->lastused = time_second; 677 SP_ADDREF(sp); 678 } 679 SPTREE_UNLOCK(); 680 681 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 682 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 683 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 684 return sp; 685} 686 687#if 0 688/* 689 * return a policy that matches this particular inbound packet. 690 * XXX slow 691 */ 692struct secpolicy * 693key_gettunnel(const struct sockaddr *osrc, 694 const struct sockaddr *odst, 695 const struct sockaddr *isrc, 696 const struct sockaddr *idst, 697 const char* where, int tag) 698{ 699 INIT_VNET_IPSEC(curvnet); 700 struct secpolicy *sp; 701 const int dir = IPSEC_DIR_INBOUND; 702 struct ipsecrequest *r1, *r2, *p; 703 struct secpolicyindex spidx; 704 705 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 706 printf("DP %s from %s:%u\n", __func__, where, tag)); 707 708 if (isrc->sa_family != idst->sa_family) { 709 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 710 __func__, isrc->sa_family, idst->sa_family)); 711 sp = NULL; 712 goto done; 713 } 714 715 SPTREE_LOCK(); 716 LIST_FOREACH(sp, &V_sptree[dir], chain) { 717 if (sp->state == IPSEC_SPSTATE_DEAD) 718 continue; 719 720 r1 = r2 = NULL; 721 for (p = sp->req; p; p = p->next) { 722 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 723 continue; 724 725 r1 = r2; 726 r2 = p; 727 728 if (!r1) { 729 /* here we look at address matches only */ 730 spidx = sp->spidx; 731 if (isrc->sa_len > sizeof(spidx.src) || 732 idst->sa_len > sizeof(spidx.dst)) 733 continue; 734 bcopy(isrc, &spidx.src, isrc->sa_len); 735 bcopy(idst, &spidx.dst, idst->sa_len); 736 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 737 continue; 738 } else { 739 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 740 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 741 continue; 742 } 743 744 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 745 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 746 continue; 747 748 goto found; 749 } 750 } 751 sp = NULL; 752found: 753 if (sp) { 754 sp->lastused = time_second; 755 SP_ADDREF(sp); 756 } 757 SPTREE_UNLOCK(); 758done: 759 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 760 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 761 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 762 return sp; 763} 764#endif 765 766/* 767 * allocating an SA entry for an *OUTBOUND* packet. 768 * checking each request entries in SP, and acquire an SA if need. 769 * OUT: 0: there are valid requests. 770 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 771 */ 772int 773key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 774{ 775 INIT_VNET_IPSEC(curvnet); 776 u_int level; 777 int error; 778 779 IPSEC_ASSERT(isr != NULL, ("null isr")); 780 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 781 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 782 saidx->mode == IPSEC_MODE_TUNNEL, 783 ("unexpected policy %u", saidx->mode)); 784 785 /* 786 * XXX guard against protocol callbacks from the crypto 787 * thread as they reference ipsecrequest.sav which we 788 * temporarily null out below. Need to rethink how we 789 * handle bundled SA's in the callback thread. 790 */ 791 IPSECREQUEST_LOCK_ASSERT(isr); 792 793 /* get current level */ 794 level = ipsec_get_reqlevel(isr); 795#if 0 796 /* 797 * We do allocate new SA only if the state of SA in the holder is 798 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 799 */ 800 if (isr->sav != NULL) { 801 if (isr->sav->sah == NULL) 802 panic("%s: sah is null.\n", __func__); 803 if (isr->sav == (struct secasvar *)LIST_FIRST( 804 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 805 KEY_FREESAV(&isr->sav); 806 isr->sav = NULL; 807 } 808 } 809#else 810 /* 811 * we free any SA stashed in the IPsec request because a different 812 * SA may be involved each time this request is checked, either 813 * because new SAs are being configured, or this request is 814 * associated with an unconnected datagram socket, or this request 815 * is associated with a system default policy. 816 * 817 * The operation may have negative impact to performance. We may 818 * want to check cached SA carefully, rather than picking new SA 819 * every time. 820 */ 821 if (isr->sav != NULL) { 822 KEY_FREESAV(&isr->sav); 823 isr->sav = NULL; 824 } 825#endif 826 827 /* 828 * new SA allocation if no SA found. 829 * key_allocsa_policy should allocate the oldest SA available. 830 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 831 */ 832 if (isr->sav == NULL) 833 isr->sav = key_allocsa_policy(saidx); 834 835 /* When there is SA. */ 836 if (isr->sav != NULL) { 837 if (isr->sav->state != SADB_SASTATE_MATURE && 838 isr->sav->state != SADB_SASTATE_DYING) 839 return EINVAL; 840 return 0; 841 } 842 843 /* there is no SA */ 844 error = key_acquire(saidx, isr->sp); 845 if (error != 0) { 846 /* XXX What should I do ? */ 847 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 848 __func__, error)); 849 return error; 850 } 851 852 if (level != IPSEC_LEVEL_REQUIRE) { 853 /* XXX sigh, the interface to this routine is botched */ 854 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 855 return 0; 856 } else { 857 return ENOENT; 858 } 859} 860 861/* 862 * allocating a SA for policy entry from SAD. 863 * NOTE: searching SAD of aliving state. 864 * OUT: NULL: not found. 865 * others: found and return the pointer. 866 */ 867static struct secasvar * 868key_allocsa_policy(const struct secasindex *saidx) 869{ 870#define N(a) _ARRAYLEN(a) 871 INIT_VNET_IPSEC(curvnet); 872 struct secashead *sah; 873 struct secasvar *sav; 874 u_int stateidx, arraysize; 875 const u_int *state_valid; 876 877 SAHTREE_LOCK(); 878 LIST_FOREACH(sah, &V_sahtree, chain) { 879 if (sah->state == SADB_SASTATE_DEAD) 880 continue; 881 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 882 if (V_key_preferred_oldsa) { 883 state_valid = saorder_state_valid_prefer_old; 884 arraysize = N(saorder_state_valid_prefer_old); 885 } else { 886 state_valid = saorder_state_valid_prefer_new; 887 arraysize = N(saorder_state_valid_prefer_new); 888 } 889 SAHTREE_UNLOCK(); 890 goto found; 891 } 892 } 893 SAHTREE_UNLOCK(); 894 895 return NULL; 896 897 found: 898 /* search valid state */ 899 for (stateidx = 0; stateidx < arraysize; stateidx++) { 900 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 901 if (sav != NULL) 902 return sav; 903 } 904 905 return NULL; 906#undef N 907} 908 909/* 910 * searching SAD with direction, protocol, mode and state. 911 * called by key_allocsa_policy(). 912 * OUT: 913 * NULL : not found 914 * others : found, pointer to a SA. 915 */ 916static struct secasvar * 917key_do_allocsa_policy(struct secashead *sah, u_int state) 918{ 919 INIT_VNET_IPSEC(curvnet); 920 struct secasvar *sav, *nextsav, *candidate, *d; 921 922 /* initilize */ 923 candidate = NULL; 924 925 SAHTREE_LOCK(); 926 for (sav = LIST_FIRST(&sah->savtree[state]); 927 sav != NULL; 928 sav = nextsav) { 929 930 nextsav = LIST_NEXT(sav, chain); 931 932 /* sanity check */ 933 KEY_CHKSASTATE(sav->state, state, __func__); 934 935 /* initialize */ 936 if (candidate == NULL) { 937 candidate = sav; 938 continue; 939 } 940 941 /* Which SA is the better ? */ 942 943 IPSEC_ASSERT(candidate->lft_c != NULL, 944 ("null candidate lifetime")); 945 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 946 947 /* What the best method is to compare ? */ 948 if (V_key_preferred_oldsa) { 949 if (candidate->lft_c->addtime > 950 sav->lft_c->addtime) { 951 candidate = sav; 952 } 953 continue; 954 /*NOTREACHED*/ 955 } 956 957 /* preferred new sa rather than old sa */ 958 if (candidate->lft_c->addtime < 959 sav->lft_c->addtime) { 960 d = candidate; 961 candidate = sav; 962 } else 963 d = sav; 964 965 /* 966 * prepared to delete the SA when there is more 967 * suitable candidate and the lifetime of the SA is not 968 * permanent. 969 */ 970 if (d->lft_h->addtime != 0) { 971 struct mbuf *m, *result; 972 u_int8_t satype; 973 974 key_sa_chgstate(d, SADB_SASTATE_DEAD); 975 976 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 977 978 satype = key_proto2satype(d->sah->saidx.proto); 979 if (satype == 0) 980 goto msgfail; 981 982 m = key_setsadbmsg(SADB_DELETE, 0, 983 satype, 0, 0, d->refcnt - 1); 984 if (!m) 985 goto msgfail; 986 result = m; 987 988 /* set sadb_address for saidx's. */ 989 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 990 &d->sah->saidx.src.sa, 991 d->sah->saidx.src.sa.sa_len << 3, 992 IPSEC_ULPROTO_ANY); 993 if (!m) 994 goto msgfail; 995 m_cat(result, m); 996 997 /* set sadb_address for saidx's. */ 998 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 999 &d->sah->saidx.dst.sa, 1000 d->sah->saidx.dst.sa.sa_len << 3, 1001 IPSEC_ULPROTO_ANY); 1002 if (!m) 1003 goto msgfail; 1004 m_cat(result, m); 1005 1006 /* create SA extension */ 1007 m = key_setsadbsa(d); 1008 if (!m) 1009 goto msgfail; 1010 m_cat(result, m); 1011 1012 if (result->m_len < sizeof(struct sadb_msg)) { 1013 result = m_pullup(result, 1014 sizeof(struct sadb_msg)); 1015 if (result == NULL) 1016 goto msgfail; 1017 } 1018 1019 result->m_pkthdr.len = 0; 1020 for (m = result; m; m = m->m_next) 1021 result->m_pkthdr.len += m->m_len; 1022 mtod(result, struct sadb_msg *)->sadb_msg_len = 1023 PFKEY_UNIT64(result->m_pkthdr.len); 1024 1025 if (key_sendup_mbuf(NULL, result, 1026 KEY_SENDUP_REGISTERED)) 1027 goto msgfail; 1028 msgfail: 1029 KEY_FREESAV(&d); 1030 } 1031 } 1032 if (candidate) { 1033 sa_addref(candidate); 1034 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1035 printf("DP %s cause refcnt++:%d SA:%p\n", 1036 __func__, candidate->refcnt, candidate)); 1037 } 1038 SAHTREE_UNLOCK(); 1039 1040 return candidate; 1041} 1042 1043/* 1044 * allocating a usable SA entry for a *INBOUND* packet. 1045 * Must call key_freesav() later. 1046 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1047 * NULL: not found, or error occured. 1048 * 1049 * In the comparison, no source address is used--for RFC2401 conformance. 1050 * To quote, from section 4.1: 1051 * A security association is uniquely identified by a triple consisting 1052 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1053 * security protocol (AH or ESP) identifier. 1054 * Note that, however, we do need to keep source address in IPsec SA. 1055 * IKE specification and PF_KEY specification do assume that we 1056 * keep source address in IPsec SA. We see a tricky situation here. 1057 */ 1058struct secasvar * 1059key_allocsa( 1060 union sockaddr_union *dst, 1061 u_int proto, 1062 u_int32_t spi, 1063 const char* where, int tag) 1064{ 1065 INIT_VNET_IPSEC(curvnet); 1066 struct secashead *sah; 1067 struct secasvar *sav; 1068 u_int stateidx, arraysize, state; 1069 const u_int *saorder_state_valid; 1070 1071 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1072 1073 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1074 printf("DP %s from %s:%u\n", __func__, where, tag)); 1075 1076 /* 1077 * searching SAD. 1078 * XXX: to be checked internal IP header somewhere. Also when 1079 * IPsec tunnel packet is received. But ESP tunnel mode is 1080 * encrypted so we can't check internal IP header. 1081 */ 1082 SAHTREE_LOCK(); 1083 if (V_key_preferred_oldsa) { 1084 saorder_state_valid = saorder_state_valid_prefer_old; 1085 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1086 } else { 1087 saorder_state_valid = saorder_state_valid_prefer_new; 1088 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1089 } 1090 LIST_FOREACH(sah, &V_sahtree, chain) { 1091 /* search valid state */ 1092 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1093 state = saorder_state_valid[stateidx]; 1094 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1095 /* sanity check */ 1096 KEY_CHKSASTATE(sav->state, state, __func__); 1097 /* do not return entries w/ unusable state */ 1098 if (sav->state != SADB_SASTATE_MATURE && 1099 sav->state != SADB_SASTATE_DYING) 1100 continue; 1101 if (proto != sav->sah->saidx.proto) 1102 continue; 1103 if (spi != sav->spi) 1104 continue; 1105#if 0 /* don't check src */ 1106 /* check src address */ 1107 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1108 continue; 1109#endif 1110 /* check dst address */ 1111 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1112 continue; 1113 sa_addref(sav); 1114 goto done; 1115 } 1116 } 1117 } 1118 sav = NULL; 1119done: 1120 SAHTREE_UNLOCK(); 1121 1122 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1123 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1124 sav, sav ? sav->refcnt : 0)); 1125 return sav; 1126} 1127 1128/* 1129 * Must be called after calling key_allocsp(). 1130 * For both the packet without socket and key_freeso(). 1131 */ 1132void 1133_key_freesp(struct secpolicy **spp, const char* where, int tag) 1134{ 1135 INIT_VNET_IPSEC(curvnet); 1136 struct secpolicy *sp = *spp; 1137 1138 IPSEC_ASSERT(sp != NULL, ("null sp")); 1139 1140 SPTREE_LOCK(); 1141 SP_DELREF(sp); 1142 1143 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1144 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1145 __func__, sp, sp->id, where, tag, sp->refcnt)); 1146 1147 if (sp->refcnt == 0) { 1148 *spp = NULL; 1149 key_delsp(sp); 1150 } 1151 SPTREE_UNLOCK(); 1152} 1153 1154/* 1155 * Must be called after calling key_allocsp(). 1156 * For the packet with socket. 1157 */ 1158void 1159key_freeso(struct socket *so) 1160{ 1161 INIT_VNET_IPSEC(curvnet); 1162 IPSEC_ASSERT(so != NULL, ("null so")); 1163 1164 switch (so->so_proto->pr_domain->dom_family) { 1165#if defined(INET) || defined(INET6) 1166#ifdef INET 1167 case PF_INET: 1168#endif 1169#ifdef INET6 1170 case PF_INET6: 1171#endif 1172 { 1173 struct inpcb *pcb = sotoinpcb(so); 1174 1175 /* Does it have a PCB ? */ 1176 if (pcb == NULL) 1177 return; 1178 key_freesp_so(&pcb->inp_sp->sp_in); 1179 key_freesp_so(&pcb->inp_sp->sp_out); 1180 } 1181 break; 1182#endif /* INET || INET6 */ 1183 default: 1184 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1185 __func__, so->so_proto->pr_domain->dom_family)); 1186 return; 1187 } 1188} 1189 1190static void 1191key_freesp_so(struct secpolicy **sp) 1192{ 1193 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1194 1195 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1196 (*sp)->policy == IPSEC_POLICY_BYPASS) 1197 return; 1198 1199 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1200 ("invalid policy %u", (*sp)->policy)); 1201 KEY_FREESP(sp); 1202} 1203 1204/* 1205 * Must be called after calling key_allocsa(). 1206 * This function is called by key_freesp() to free some SA allocated 1207 * for a policy. 1208 */ 1209void 1210key_freesav(struct secasvar **psav, const char* where, int tag) 1211{ 1212 INIT_VNET_IPSEC(curvnet); 1213 struct secasvar *sav = *psav; 1214 1215 IPSEC_ASSERT(sav != NULL, ("null sav")); 1216 1217 if (sa_delref(sav)) { 1218 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1219 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1220 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1221 *psav = NULL; 1222 key_delsav(sav); 1223 } else { 1224 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1225 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1226 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1227 } 1228} 1229 1230/* %%% SPD management */ 1231/* 1232 * free security policy entry. 1233 */ 1234static void 1235key_delsp(struct secpolicy *sp) 1236{ 1237 struct ipsecrequest *isr, *nextisr; 1238 1239 IPSEC_ASSERT(sp != NULL, ("null sp")); 1240 SPTREE_LOCK_ASSERT(); 1241 1242 sp->state = IPSEC_SPSTATE_DEAD; 1243 1244 IPSEC_ASSERT(sp->refcnt == 0, 1245 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1246 1247 /* remove from SP index */ 1248 if (__LIST_CHAINED(sp)) 1249 LIST_REMOVE(sp, chain); 1250 1251 for (isr = sp->req; isr != NULL; isr = nextisr) { 1252 if (isr->sav != NULL) { 1253 KEY_FREESAV(&isr->sav); 1254 isr->sav = NULL; 1255 } 1256 1257 nextisr = isr->next; 1258 ipsec_delisr(isr); 1259 } 1260 _key_delsp(sp); 1261} 1262 1263/* 1264 * search SPD 1265 * OUT: NULL : not found 1266 * others : found, pointer to a SP. 1267 */ 1268static struct secpolicy * 1269key_getsp(struct secpolicyindex *spidx) 1270{ 1271 INIT_VNET_IPSEC(curvnet); 1272 struct secpolicy *sp; 1273 1274 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1275 1276 SPTREE_LOCK(); 1277 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1278 if (sp->state == IPSEC_SPSTATE_DEAD) 1279 continue; 1280 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1281 SP_ADDREF(sp); 1282 break; 1283 } 1284 } 1285 SPTREE_UNLOCK(); 1286 1287 return sp; 1288} 1289 1290/* 1291 * get SP by index. 1292 * OUT: NULL : not found 1293 * others : found, pointer to a SP. 1294 */ 1295static struct secpolicy * 1296key_getspbyid(u_int32_t id) 1297{ 1298 INIT_VNET_IPSEC(curvnet); 1299 struct secpolicy *sp; 1300 1301 SPTREE_LOCK(); 1302 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1303 if (sp->state == IPSEC_SPSTATE_DEAD) 1304 continue; 1305 if (sp->id == id) { 1306 SP_ADDREF(sp); 1307 goto done; 1308 } 1309 } 1310 1311 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1312 if (sp->state == IPSEC_SPSTATE_DEAD) 1313 continue; 1314 if (sp->id == id) { 1315 SP_ADDREF(sp); 1316 goto done; 1317 } 1318 } 1319done: 1320 SPTREE_UNLOCK(); 1321 1322 return sp; 1323} 1324 1325struct secpolicy * 1326key_newsp(const char* where, int tag) 1327{ 1328 INIT_VNET_IPSEC(curvnet); 1329 struct secpolicy *newsp = NULL; 1330 1331 newsp = (struct secpolicy *) 1332 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1333 if (newsp) { 1334 SECPOLICY_LOCK_INIT(newsp); 1335 newsp->refcnt = 1; 1336 newsp->req = NULL; 1337 } 1338 1339 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1340 printf("DP %s from %s:%u return SP:%p\n", __func__, 1341 where, tag, newsp)); 1342 return newsp; 1343} 1344 1345static void 1346_key_delsp(struct secpolicy *sp) 1347{ 1348 SECPOLICY_LOCK_DESTROY(sp); 1349 free(sp, M_IPSEC_SP); 1350} 1351 1352/* 1353 * create secpolicy structure from sadb_x_policy structure. 1354 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1355 * so must be set properly later. 1356 */ 1357struct secpolicy * 1358key_msg2sp(xpl0, len, error) 1359 struct sadb_x_policy *xpl0; 1360 size_t len; 1361 int *error; 1362{ 1363 INIT_VNET_IPSEC(curvnet); 1364 struct secpolicy *newsp; 1365 1366 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1367 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1368 1369 if (len != PFKEY_EXTLEN(xpl0)) { 1370 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1371 *error = EINVAL; 1372 return NULL; 1373 } 1374 1375 if ((newsp = KEY_NEWSP()) == NULL) { 1376 *error = ENOBUFS; 1377 return NULL; 1378 } 1379 1380 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1381 newsp->policy = xpl0->sadb_x_policy_type; 1382 1383 /* check policy */ 1384 switch (xpl0->sadb_x_policy_type) { 1385 case IPSEC_POLICY_DISCARD: 1386 case IPSEC_POLICY_NONE: 1387 case IPSEC_POLICY_ENTRUST: 1388 case IPSEC_POLICY_BYPASS: 1389 newsp->req = NULL; 1390 break; 1391 1392 case IPSEC_POLICY_IPSEC: 1393 { 1394 int tlen; 1395 struct sadb_x_ipsecrequest *xisr; 1396 struct ipsecrequest **p_isr = &newsp->req; 1397 1398 /* validity check */ 1399 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1400 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1401 __func__)); 1402 KEY_FREESP(&newsp); 1403 *error = EINVAL; 1404 return NULL; 1405 } 1406 1407 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1408 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1409 1410 while (tlen > 0) { 1411 /* length check */ 1412 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1413 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1414 "length.\n", __func__)); 1415 KEY_FREESP(&newsp); 1416 *error = EINVAL; 1417 return NULL; 1418 } 1419 1420 /* allocate request buffer */ 1421 /* NB: data structure is zero'd */ 1422 *p_isr = ipsec_newisr(); 1423 if ((*p_isr) == NULL) { 1424 ipseclog((LOG_DEBUG, 1425 "%s: No more memory.\n", __func__)); 1426 KEY_FREESP(&newsp); 1427 *error = ENOBUFS; 1428 return NULL; 1429 } 1430 1431 /* set values */ 1432 switch (xisr->sadb_x_ipsecrequest_proto) { 1433 case IPPROTO_ESP: 1434 case IPPROTO_AH: 1435 case IPPROTO_IPCOMP: 1436 break; 1437 default: 1438 ipseclog((LOG_DEBUG, 1439 "%s: invalid proto type=%u\n", __func__, 1440 xisr->sadb_x_ipsecrequest_proto)); 1441 KEY_FREESP(&newsp); 1442 *error = EPROTONOSUPPORT; 1443 return NULL; 1444 } 1445 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1446 1447 switch (xisr->sadb_x_ipsecrequest_mode) { 1448 case IPSEC_MODE_TRANSPORT: 1449 case IPSEC_MODE_TUNNEL: 1450 break; 1451 case IPSEC_MODE_ANY: 1452 default: 1453 ipseclog((LOG_DEBUG, 1454 "%s: invalid mode=%u\n", __func__, 1455 xisr->sadb_x_ipsecrequest_mode)); 1456 KEY_FREESP(&newsp); 1457 *error = EINVAL; 1458 return NULL; 1459 } 1460 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1461 1462 switch (xisr->sadb_x_ipsecrequest_level) { 1463 case IPSEC_LEVEL_DEFAULT: 1464 case IPSEC_LEVEL_USE: 1465 case IPSEC_LEVEL_REQUIRE: 1466 break; 1467 case IPSEC_LEVEL_UNIQUE: 1468 /* validity check */ 1469 /* 1470 * If range violation of reqid, kernel will 1471 * update it, don't refuse it. 1472 */ 1473 if (xisr->sadb_x_ipsecrequest_reqid 1474 > IPSEC_MANUAL_REQID_MAX) { 1475 ipseclog((LOG_DEBUG, 1476 "%s: reqid=%d range " 1477 "violation, updated by kernel.\n", 1478 __func__, 1479 xisr->sadb_x_ipsecrequest_reqid)); 1480 xisr->sadb_x_ipsecrequest_reqid = 0; 1481 } 1482 1483 /* allocate new reqid id if reqid is zero. */ 1484 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1485 u_int32_t reqid; 1486 if ((reqid = key_newreqid()) == 0) { 1487 KEY_FREESP(&newsp); 1488 *error = ENOBUFS; 1489 return NULL; 1490 } 1491 (*p_isr)->saidx.reqid = reqid; 1492 xisr->sadb_x_ipsecrequest_reqid = reqid; 1493 } else { 1494 /* set it for manual keying. */ 1495 (*p_isr)->saidx.reqid = 1496 xisr->sadb_x_ipsecrequest_reqid; 1497 } 1498 break; 1499 1500 default: 1501 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1502 __func__, 1503 xisr->sadb_x_ipsecrequest_level)); 1504 KEY_FREESP(&newsp); 1505 *error = EINVAL; 1506 return NULL; 1507 } 1508 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1509 1510 /* set IP addresses if there */ 1511 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1512 struct sockaddr *paddr; 1513 1514 paddr = (struct sockaddr *)(xisr + 1); 1515 1516 /* validity check */ 1517 if (paddr->sa_len 1518 > sizeof((*p_isr)->saidx.src)) { 1519 ipseclog((LOG_DEBUG, "%s: invalid " 1520 "request address length.\n", 1521 __func__)); 1522 KEY_FREESP(&newsp); 1523 *error = EINVAL; 1524 return NULL; 1525 } 1526 bcopy(paddr, &(*p_isr)->saidx.src, 1527 paddr->sa_len); 1528 1529 paddr = (struct sockaddr *)((caddr_t)paddr 1530 + paddr->sa_len); 1531 1532 /* validity check */ 1533 if (paddr->sa_len 1534 > sizeof((*p_isr)->saidx.dst)) { 1535 ipseclog((LOG_DEBUG, "%s: invalid " 1536 "request address length.\n", 1537 __func__)); 1538 KEY_FREESP(&newsp); 1539 *error = EINVAL; 1540 return NULL; 1541 } 1542 bcopy(paddr, &(*p_isr)->saidx.dst, 1543 paddr->sa_len); 1544 } 1545 1546 (*p_isr)->sp = newsp; 1547 1548 /* initialization for the next. */ 1549 p_isr = &(*p_isr)->next; 1550 tlen -= xisr->sadb_x_ipsecrequest_len; 1551 1552 /* validity check */ 1553 if (tlen < 0) { 1554 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1555 __func__)); 1556 KEY_FREESP(&newsp); 1557 *error = EINVAL; 1558 return NULL; 1559 } 1560 1561 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1562 + xisr->sadb_x_ipsecrequest_len); 1563 } 1564 } 1565 break; 1566 default: 1567 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1568 KEY_FREESP(&newsp); 1569 *error = EINVAL; 1570 return NULL; 1571 } 1572 1573 *error = 0; 1574 return newsp; 1575} 1576 1577static u_int32_t 1578key_newreqid() 1579{ 1580 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1581 1582 auto_reqid = (auto_reqid == ~0 1583 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1584 1585 /* XXX should be unique check */ 1586 1587 return auto_reqid; 1588} 1589 1590/* 1591 * copy secpolicy struct to sadb_x_policy structure indicated. 1592 */ 1593struct mbuf * 1594key_sp2msg(sp) 1595 struct secpolicy *sp; 1596{ 1597 struct sadb_x_policy *xpl; 1598 int tlen; 1599 caddr_t p; 1600 struct mbuf *m; 1601 1602 IPSEC_ASSERT(sp != NULL, ("null policy")); 1603 1604 tlen = key_getspreqmsglen(sp); 1605 1606 m = key_alloc_mbuf(tlen); 1607 if (!m || m->m_next) { /*XXX*/ 1608 if (m) 1609 m_freem(m); 1610 return NULL; 1611 } 1612 1613 m->m_len = tlen; 1614 m->m_next = NULL; 1615 xpl = mtod(m, struct sadb_x_policy *); 1616 bzero(xpl, tlen); 1617 1618 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1619 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1620 xpl->sadb_x_policy_type = sp->policy; 1621 xpl->sadb_x_policy_dir = sp->spidx.dir; 1622 xpl->sadb_x_policy_id = sp->id; 1623 p = (caddr_t)xpl + sizeof(*xpl); 1624 1625 /* if is the policy for ipsec ? */ 1626 if (sp->policy == IPSEC_POLICY_IPSEC) { 1627 struct sadb_x_ipsecrequest *xisr; 1628 struct ipsecrequest *isr; 1629 1630 for (isr = sp->req; isr != NULL; isr = isr->next) { 1631 1632 xisr = (struct sadb_x_ipsecrequest *)p; 1633 1634 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1635 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1636 xisr->sadb_x_ipsecrequest_level = isr->level; 1637 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1638 1639 p += sizeof(*xisr); 1640 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1641 p += isr->saidx.src.sa.sa_len; 1642 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1643 p += isr->saidx.src.sa.sa_len; 1644 1645 xisr->sadb_x_ipsecrequest_len = 1646 PFKEY_ALIGN8(sizeof(*xisr) 1647 + isr->saidx.src.sa.sa_len 1648 + isr->saidx.dst.sa.sa_len); 1649 } 1650 } 1651 1652 return m; 1653} 1654 1655/* m will not be freed nor modified */ 1656static struct mbuf * 1657#ifdef __STDC__ 1658key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1659 int ndeep, int nitem, ...) 1660#else 1661key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1662 struct mbuf *m; 1663 const struct sadb_msghdr *mhp; 1664 int ndeep; 1665 int nitem; 1666 va_dcl 1667#endif 1668{ 1669 va_list ap; 1670 int idx; 1671 int i; 1672 struct mbuf *result = NULL, *n; 1673 int len; 1674 1675 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1676 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1677 1678 va_start(ap, nitem); 1679 for (i = 0; i < nitem; i++) { 1680 idx = va_arg(ap, int); 1681 if (idx < 0 || idx > SADB_EXT_MAX) 1682 goto fail; 1683 /* don't attempt to pull empty extension */ 1684 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1685 continue; 1686 if (idx != SADB_EXT_RESERVED && 1687 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1688 continue; 1689 1690 if (idx == SADB_EXT_RESERVED) { 1691 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1692 1693 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1694 1695 MGETHDR(n, M_DONTWAIT, MT_DATA); 1696 if (!n) 1697 goto fail; 1698 n->m_len = len; 1699 n->m_next = NULL; 1700 m_copydata(m, 0, sizeof(struct sadb_msg), 1701 mtod(n, caddr_t)); 1702 } else if (i < ndeep) { 1703 len = mhp->extlen[idx]; 1704 n = key_alloc_mbuf(len); 1705 if (!n || n->m_next) { /*XXX*/ 1706 if (n) 1707 m_freem(n); 1708 goto fail; 1709 } 1710 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1711 mtod(n, caddr_t)); 1712 } else { 1713 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1714 M_DONTWAIT); 1715 } 1716 if (n == NULL) 1717 goto fail; 1718 1719 if (result) 1720 m_cat(result, n); 1721 else 1722 result = n; 1723 } 1724 va_end(ap); 1725 1726 if ((result->m_flags & M_PKTHDR) != 0) { 1727 result->m_pkthdr.len = 0; 1728 for (n = result; n; n = n->m_next) 1729 result->m_pkthdr.len += n->m_len; 1730 } 1731 1732 return result; 1733 1734fail: 1735 m_freem(result); 1736 return NULL; 1737} 1738 1739/* 1740 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1741 * add an entry to SP database, when received 1742 * <base, address(SD), (lifetime(H),) policy> 1743 * from the user(?). 1744 * Adding to SP database, 1745 * and send 1746 * <base, address(SD), (lifetime(H),) policy> 1747 * to the socket which was send. 1748 * 1749 * SPDADD set a unique policy entry. 1750 * SPDSETIDX like SPDADD without a part of policy requests. 1751 * SPDUPDATE replace a unique policy entry. 1752 * 1753 * m will always be freed. 1754 */ 1755static int 1756key_spdadd(so, m, mhp) 1757 struct socket *so; 1758 struct mbuf *m; 1759 const struct sadb_msghdr *mhp; 1760{ 1761 INIT_VNET_IPSEC(curvnet); 1762 struct sadb_address *src0, *dst0; 1763 struct sadb_x_policy *xpl0, *xpl; 1764 struct sadb_lifetime *lft = NULL; 1765 struct secpolicyindex spidx; 1766 struct secpolicy *newsp; 1767 int error; 1768 1769 IPSEC_ASSERT(so != NULL, ("null socket")); 1770 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1771 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1772 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1773 1774 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1775 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1776 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1777 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1778 return key_senderror(so, m, EINVAL); 1779 } 1780 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1781 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1782 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1783 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1784 __func__)); 1785 return key_senderror(so, m, EINVAL); 1786 } 1787 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1788 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1789 < sizeof(struct sadb_lifetime)) { 1790 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1791 __func__)); 1792 return key_senderror(so, m, EINVAL); 1793 } 1794 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1795 } 1796 1797 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1798 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1799 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1800 1801 /* make secindex */ 1802 /* XXX boundary check against sa_len */ 1803 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1804 src0 + 1, 1805 dst0 + 1, 1806 src0->sadb_address_prefixlen, 1807 dst0->sadb_address_prefixlen, 1808 src0->sadb_address_proto, 1809 &spidx); 1810 1811 /* checking the direciton. */ 1812 switch (xpl0->sadb_x_policy_dir) { 1813 case IPSEC_DIR_INBOUND: 1814 case IPSEC_DIR_OUTBOUND: 1815 break; 1816 default: 1817 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1818 mhp->msg->sadb_msg_errno = EINVAL; 1819 return 0; 1820 } 1821 1822 /* check policy */ 1823 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1824 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1825 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1826 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1827 return key_senderror(so, m, EINVAL); 1828 } 1829 1830 /* policy requests are mandatory when action is ipsec. */ 1831 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1832 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1833 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1834 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1835 __func__)); 1836 return key_senderror(so, m, EINVAL); 1837 } 1838 1839 /* 1840 * checking there is SP already or not. 1841 * SPDUPDATE doesn't depend on whether there is a SP or not. 1842 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1843 * then error. 1844 */ 1845 newsp = key_getsp(&spidx); 1846 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1847 if (newsp) { 1848 newsp->state = IPSEC_SPSTATE_DEAD; 1849 KEY_FREESP(&newsp); 1850 } 1851 } else { 1852 if (newsp != NULL) { 1853 KEY_FREESP(&newsp); 1854 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1855 __func__)); 1856 return key_senderror(so, m, EEXIST); 1857 } 1858 } 1859 1860 /* allocation new SP entry */ 1861 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1862 return key_senderror(so, m, error); 1863 } 1864 1865 if ((newsp->id = key_getnewspid()) == 0) { 1866 _key_delsp(newsp); 1867 return key_senderror(so, m, ENOBUFS); 1868 } 1869 1870 /* XXX boundary check against sa_len */ 1871 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1872 src0 + 1, 1873 dst0 + 1, 1874 src0->sadb_address_prefixlen, 1875 dst0->sadb_address_prefixlen, 1876 src0->sadb_address_proto, 1877 &newsp->spidx); 1878 1879 /* sanity check on addr pair */ 1880 if (((struct sockaddr *)(src0 + 1))->sa_family != 1881 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1882 _key_delsp(newsp); 1883 return key_senderror(so, m, EINVAL); 1884 } 1885 if (((struct sockaddr *)(src0 + 1))->sa_len != 1886 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1887 _key_delsp(newsp); 1888 return key_senderror(so, m, EINVAL); 1889 } 1890#if 1 1891 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1892 struct sockaddr *sa; 1893 sa = (struct sockaddr *)(src0 + 1); 1894 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1895 _key_delsp(newsp); 1896 return key_senderror(so, m, EINVAL); 1897 } 1898 } 1899 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1900 struct sockaddr *sa; 1901 sa = (struct sockaddr *)(dst0 + 1); 1902 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1903 _key_delsp(newsp); 1904 return key_senderror(so, m, EINVAL); 1905 } 1906 } 1907#endif 1908 1909 newsp->created = time_second; 1910 newsp->lastused = newsp->created; 1911 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1912 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1913 1914 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1915 newsp->state = IPSEC_SPSTATE_ALIVE; 1916 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1917 1918 /* delete the entry in spacqtree */ 1919 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1920 struct secspacq *spacq = key_getspacq(&spidx); 1921 if (spacq != NULL) { 1922 /* reset counter in order to deletion by timehandler. */ 1923 spacq->created = time_second; 1924 spacq->count = 0; 1925 SPACQ_UNLOCK(); 1926 } 1927 } 1928 1929 { 1930 struct mbuf *n, *mpolicy; 1931 struct sadb_msg *newmsg; 1932 int off; 1933 1934 /* create new sadb_msg to reply. */ 1935 if (lft) { 1936 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1937 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1938 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1939 } else { 1940 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1941 SADB_X_EXT_POLICY, 1942 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1943 } 1944 if (!n) 1945 return key_senderror(so, m, ENOBUFS); 1946 1947 if (n->m_len < sizeof(*newmsg)) { 1948 n = m_pullup(n, sizeof(*newmsg)); 1949 if (!n) 1950 return key_senderror(so, m, ENOBUFS); 1951 } 1952 newmsg = mtod(n, struct sadb_msg *); 1953 newmsg->sadb_msg_errno = 0; 1954 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1955 1956 off = 0; 1957 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1958 sizeof(*xpl), &off); 1959 if (mpolicy == NULL) { 1960 /* n is already freed */ 1961 return key_senderror(so, m, ENOBUFS); 1962 } 1963 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1964 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1965 m_freem(n); 1966 return key_senderror(so, m, EINVAL); 1967 } 1968 xpl->sadb_x_policy_id = newsp->id; 1969 1970 m_freem(m); 1971 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1972 } 1973} 1974 1975/* 1976 * get new policy id. 1977 * OUT: 1978 * 0: failure. 1979 * others: success. 1980 */ 1981static u_int32_t 1982key_getnewspid() 1983{ 1984 INIT_VNET_IPSEC(curvnet); 1985 u_int32_t newid = 0; 1986 int count = V_key_spi_trycnt; /* XXX */ 1987 struct secpolicy *sp; 1988 1989 /* when requesting to allocate spi ranged */ 1990 while (count--) { 1991 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1992 1993 if ((sp = key_getspbyid(newid)) == NULL) 1994 break; 1995 1996 KEY_FREESP(&sp); 1997 } 1998 1999 if (count == 0 || newid == 0) { 2000 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2001 __func__)); 2002 return 0; 2003 } 2004 2005 return newid; 2006} 2007 2008/* 2009 * SADB_SPDDELETE processing 2010 * receive 2011 * <base, address(SD), policy(*)> 2012 * from the user(?), and set SADB_SASTATE_DEAD, 2013 * and send, 2014 * <base, address(SD), policy(*)> 2015 * to the ikmpd. 2016 * policy(*) including direction of policy. 2017 * 2018 * m will always be freed. 2019 */ 2020static int 2021key_spddelete(so, m, mhp) 2022 struct socket *so; 2023 struct mbuf *m; 2024 const struct sadb_msghdr *mhp; 2025{ 2026 INIT_VNET_IPSEC(curvnet); 2027 struct sadb_address *src0, *dst0; 2028 struct sadb_x_policy *xpl0; 2029 struct secpolicyindex spidx; 2030 struct secpolicy *sp; 2031 2032 IPSEC_ASSERT(so != NULL, ("null so")); 2033 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2034 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2035 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2036 2037 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2038 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2039 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2040 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2041 __func__)); 2042 return key_senderror(so, m, EINVAL); 2043 } 2044 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2045 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2046 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2047 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2048 __func__)); 2049 return key_senderror(so, m, EINVAL); 2050 } 2051 2052 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2053 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2054 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2055 2056 /* make secindex */ 2057 /* XXX boundary check against sa_len */ 2058 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2059 src0 + 1, 2060 dst0 + 1, 2061 src0->sadb_address_prefixlen, 2062 dst0->sadb_address_prefixlen, 2063 src0->sadb_address_proto, 2064 &spidx); 2065 2066 /* checking the direciton. */ 2067 switch (xpl0->sadb_x_policy_dir) { 2068 case IPSEC_DIR_INBOUND: 2069 case IPSEC_DIR_OUTBOUND: 2070 break; 2071 default: 2072 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2073 return key_senderror(so, m, EINVAL); 2074 } 2075 2076 /* Is there SP in SPD ? */ 2077 if ((sp = key_getsp(&spidx)) == NULL) { 2078 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2079 return key_senderror(so, m, EINVAL); 2080 } 2081 2082 /* save policy id to buffer to be returned. */ 2083 xpl0->sadb_x_policy_id = sp->id; 2084 2085 sp->state = IPSEC_SPSTATE_DEAD; 2086 KEY_FREESP(&sp); 2087 2088 { 2089 struct mbuf *n; 2090 struct sadb_msg *newmsg; 2091 2092 /* create new sadb_msg to reply. */ 2093 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2094 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2095 if (!n) 2096 return key_senderror(so, m, ENOBUFS); 2097 2098 newmsg = mtod(n, struct sadb_msg *); 2099 newmsg->sadb_msg_errno = 0; 2100 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2101 2102 m_freem(m); 2103 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2104 } 2105} 2106 2107/* 2108 * SADB_SPDDELETE2 processing 2109 * receive 2110 * <base, policy(*)> 2111 * from the user(?), and set SADB_SASTATE_DEAD, 2112 * and send, 2113 * <base, policy(*)> 2114 * to the ikmpd. 2115 * policy(*) including direction of policy. 2116 * 2117 * m will always be freed. 2118 */ 2119static int 2120key_spddelete2(so, m, mhp) 2121 struct socket *so; 2122 struct mbuf *m; 2123 const struct sadb_msghdr *mhp; 2124{ 2125 INIT_VNET_IPSEC(curvnet); 2126 u_int32_t id; 2127 struct secpolicy *sp; 2128 2129 IPSEC_ASSERT(so != NULL, ("null socket")); 2130 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2131 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2132 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2133 2134 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2135 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2136 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2137 return key_senderror(so, m, EINVAL); 2138 } 2139 2140 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2141 2142 /* Is there SP in SPD ? */ 2143 if ((sp = key_getspbyid(id)) == NULL) { 2144 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2145 return key_senderror(so, m, EINVAL); 2146 } 2147 2148 sp->state = IPSEC_SPSTATE_DEAD; 2149 KEY_FREESP(&sp); 2150 2151 { 2152 struct mbuf *n, *nn; 2153 struct sadb_msg *newmsg; 2154 int off, len; 2155 2156 /* create new sadb_msg to reply. */ 2157 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2158 2159 MGETHDR(n, M_DONTWAIT, MT_DATA); 2160 if (n && len > MHLEN) { 2161 MCLGET(n, M_DONTWAIT); 2162 if ((n->m_flags & M_EXT) == 0) { 2163 m_freem(n); 2164 n = NULL; 2165 } 2166 } 2167 if (!n) 2168 return key_senderror(so, m, ENOBUFS); 2169 2170 n->m_len = len; 2171 n->m_next = NULL; 2172 off = 0; 2173 2174 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2175 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2176 2177 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2178 off, len)); 2179 2180 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2181 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2182 if (!n->m_next) { 2183 m_freem(n); 2184 return key_senderror(so, m, ENOBUFS); 2185 } 2186 2187 n->m_pkthdr.len = 0; 2188 for (nn = n; nn; nn = nn->m_next) 2189 n->m_pkthdr.len += nn->m_len; 2190 2191 newmsg = mtod(n, struct sadb_msg *); 2192 newmsg->sadb_msg_errno = 0; 2193 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2194 2195 m_freem(m); 2196 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2197 } 2198} 2199 2200/* 2201 * SADB_X_GET processing 2202 * receive 2203 * <base, policy(*)> 2204 * from the user(?), 2205 * and send, 2206 * <base, address(SD), policy> 2207 * to the ikmpd. 2208 * policy(*) including direction of policy. 2209 * 2210 * m will always be freed. 2211 */ 2212static int 2213key_spdget(so, m, mhp) 2214 struct socket *so; 2215 struct mbuf *m; 2216 const struct sadb_msghdr *mhp; 2217{ 2218 INIT_VNET_IPSEC(curvnet); 2219 u_int32_t id; 2220 struct secpolicy *sp; 2221 struct mbuf *n; 2222 2223 IPSEC_ASSERT(so != NULL, ("null socket")); 2224 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2225 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2226 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2227 2228 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2229 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2230 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2231 __func__)); 2232 return key_senderror(so, m, EINVAL); 2233 } 2234 2235 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2236 2237 /* Is there SP in SPD ? */ 2238 if ((sp = key_getspbyid(id)) == NULL) { 2239 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2240 return key_senderror(so, m, ENOENT); 2241 } 2242 2243 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2244 if (n != NULL) { 2245 m_freem(m); 2246 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2247 } else 2248 return key_senderror(so, m, ENOBUFS); 2249} 2250 2251/* 2252 * SADB_X_SPDACQUIRE processing. 2253 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2254 * send 2255 * <base, policy(*)> 2256 * to KMD, and expect to receive 2257 * <base> with SADB_X_SPDACQUIRE if error occured, 2258 * or 2259 * <base, policy> 2260 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2261 * policy(*) is without policy requests. 2262 * 2263 * 0 : succeed 2264 * others: error number 2265 */ 2266int 2267key_spdacquire(sp) 2268 struct secpolicy *sp; 2269{ 2270 INIT_VNET_IPSEC(curvnet); 2271 struct mbuf *result = NULL, *m; 2272 struct secspacq *newspacq; 2273 2274 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2275 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2276 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2277 ("policy not IPSEC %u", sp->policy)); 2278 2279 /* Get an entry to check whether sent message or not. */ 2280 newspacq = key_getspacq(&sp->spidx); 2281 if (newspacq != NULL) { 2282 if (V_key_blockacq_count < newspacq->count) { 2283 /* reset counter and do send message. */ 2284 newspacq->count = 0; 2285 } else { 2286 /* increment counter and do nothing. */ 2287 newspacq->count++; 2288 return 0; 2289 } 2290 SPACQ_UNLOCK(); 2291 } else { 2292 /* make new entry for blocking to send SADB_ACQUIRE. */ 2293 newspacq = key_newspacq(&sp->spidx); 2294 if (newspacq == NULL) 2295 return ENOBUFS; 2296 } 2297 2298 /* create new sadb_msg to reply. */ 2299 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2300 if (!m) 2301 return ENOBUFS; 2302 2303 result = m; 2304 2305 result->m_pkthdr.len = 0; 2306 for (m = result; m; m = m->m_next) 2307 result->m_pkthdr.len += m->m_len; 2308 2309 mtod(result, struct sadb_msg *)->sadb_msg_len = 2310 PFKEY_UNIT64(result->m_pkthdr.len); 2311 2312 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2313} 2314 2315/* 2316 * SADB_SPDFLUSH processing 2317 * receive 2318 * <base> 2319 * from the user, and free all entries in secpctree. 2320 * and send, 2321 * <base> 2322 * to the user. 2323 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2324 * 2325 * m will always be freed. 2326 */ 2327static int 2328key_spdflush(so, m, mhp) 2329 struct socket *so; 2330 struct mbuf *m; 2331 const struct sadb_msghdr *mhp; 2332{ 2333 INIT_VNET_IPSEC(curvnet); 2334 struct sadb_msg *newmsg; 2335 struct secpolicy *sp; 2336 u_int dir; 2337 2338 IPSEC_ASSERT(so != NULL, ("null socket")); 2339 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2340 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2341 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2342 2343 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2344 return key_senderror(so, m, EINVAL); 2345 2346 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2347 SPTREE_LOCK(); 2348 LIST_FOREACH(sp, &V_sptree[dir], chain) 2349 sp->state = IPSEC_SPSTATE_DEAD; 2350 SPTREE_UNLOCK(); 2351 } 2352 2353 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2354 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2355 return key_senderror(so, m, ENOBUFS); 2356 } 2357 2358 if (m->m_next) 2359 m_freem(m->m_next); 2360 m->m_next = NULL; 2361 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2362 newmsg = mtod(m, struct sadb_msg *); 2363 newmsg->sadb_msg_errno = 0; 2364 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2365 2366 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2367} 2368 2369/* 2370 * SADB_SPDDUMP processing 2371 * receive 2372 * <base> 2373 * from the user, and dump all SP leaves 2374 * and send, 2375 * <base> ..... 2376 * to the ikmpd. 2377 * 2378 * m will always be freed. 2379 */ 2380static int 2381key_spddump(so, m, mhp) 2382 struct socket *so; 2383 struct mbuf *m; 2384 const struct sadb_msghdr *mhp; 2385{ 2386 INIT_VNET_IPSEC(curvnet); 2387 struct secpolicy *sp; 2388 int cnt; 2389 u_int dir; 2390 struct mbuf *n; 2391 2392 IPSEC_ASSERT(so != NULL, ("null socket")); 2393 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2394 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2395 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2396 2397 /* search SPD entry and get buffer size. */ 2398 cnt = 0; 2399 SPTREE_LOCK(); 2400 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2401 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2402 cnt++; 2403 } 2404 } 2405 2406 if (cnt == 0) { 2407 SPTREE_UNLOCK(); 2408 return key_senderror(so, m, ENOENT); 2409 } 2410 2411 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2412 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2413 --cnt; 2414 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2415 mhp->msg->sadb_msg_pid); 2416 2417 if (n) 2418 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2419 } 2420 } 2421 2422 SPTREE_UNLOCK(); 2423 m_freem(m); 2424 return 0; 2425} 2426 2427static struct mbuf * 2428key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2429{ 2430 struct mbuf *result = NULL, *m; 2431 struct seclifetime lt; 2432 2433 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2434 if (!m) 2435 goto fail; 2436 result = m; 2437 2438 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2439 &sp->spidx.src.sa, sp->spidx.prefs, 2440 sp->spidx.ul_proto); 2441 if (!m) 2442 goto fail; 2443 m_cat(result, m); 2444 2445 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2446 &sp->spidx.dst.sa, sp->spidx.prefd, 2447 sp->spidx.ul_proto); 2448 if (!m) 2449 goto fail; 2450 m_cat(result, m); 2451 2452 m = key_sp2msg(sp); 2453 if (!m) 2454 goto fail; 2455 m_cat(result, m); 2456 2457 if(sp->lifetime){ 2458 lt.addtime=sp->created; 2459 lt.usetime= sp->lastused; 2460 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2461 if (!m) 2462 goto fail; 2463 m_cat(result, m); 2464 2465 lt.addtime=sp->lifetime; 2466 lt.usetime= sp->validtime; 2467 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2468 if (!m) 2469 goto fail; 2470 m_cat(result, m); 2471 } 2472 2473 if ((result->m_flags & M_PKTHDR) == 0) 2474 goto fail; 2475 2476 if (result->m_len < sizeof(struct sadb_msg)) { 2477 result = m_pullup(result, sizeof(struct sadb_msg)); 2478 if (result == NULL) 2479 goto fail; 2480 } 2481 2482 result->m_pkthdr.len = 0; 2483 for (m = result; m; m = m->m_next) 2484 result->m_pkthdr.len += m->m_len; 2485 2486 mtod(result, struct sadb_msg *)->sadb_msg_len = 2487 PFKEY_UNIT64(result->m_pkthdr.len); 2488 2489 return result; 2490 2491fail: 2492 m_freem(result); 2493 return NULL; 2494} 2495 2496/* 2497 * get PFKEY message length for security policy and request. 2498 */ 2499static u_int 2500key_getspreqmsglen(sp) 2501 struct secpolicy *sp; 2502{ 2503 u_int tlen; 2504 2505 tlen = sizeof(struct sadb_x_policy); 2506 2507 /* if is the policy for ipsec ? */ 2508 if (sp->policy != IPSEC_POLICY_IPSEC) 2509 return tlen; 2510 2511 /* get length of ipsec requests */ 2512 { 2513 struct ipsecrequest *isr; 2514 int len; 2515 2516 for (isr = sp->req; isr != NULL; isr = isr->next) { 2517 len = sizeof(struct sadb_x_ipsecrequest) 2518 + isr->saidx.src.sa.sa_len 2519 + isr->saidx.dst.sa.sa_len; 2520 2521 tlen += PFKEY_ALIGN8(len); 2522 } 2523 } 2524 2525 return tlen; 2526} 2527 2528/* 2529 * SADB_SPDEXPIRE processing 2530 * send 2531 * <base, address(SD), lifetime(CH), policy> 2532 * to KMD by PF_KEY. 2533 * 2534 * OUT: 0 : succeed 2535 * others : error number 2536 */ 2537static int 2538key_spdexpire(sp) 2539 struct secpolicy *sp; 2540{ 2541 struct mbuf *result = NULL, *m; 2542 int len; 2543 int error = -1; 2544 struct sadb_lifetime *lt; 2545 2546 /* XXX: Why do we lock ? */ 2547 2548 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2549 2550 /* set msg header */ 2551 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2552 if (!m) { 2553 error = ENOBUFS; 2554 goto fail; 2555 } 2556 result = m; 2557 2558 /* create lifetime extension (current and hard) */ 2559 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2560 m = key_alloc_mbuf(len); 2561 if (!m || m->m_next) { /*XXX*/ 2562 if (m) 2563 m_freem(m); 2564 error = ENOBUFS; 2565 goto fail; 2566 } 2567 bzero(mtod(m, caddr_t), len); 2568 lt = mtod(m, struct sadb_lifetime *); 2569 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2570 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2571 lt->sadb_lifetime_allocations = 0; 2572 lt->sadb_lifetime_bytes = 0; 2573 lt->sadb_lifetime_addtime = sp->created; 2574 lt->sadb_lifetime_usetime = sp->lastused; 2575 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2576 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2577 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2578 lt->sadb_lifetime_allocations = 0; 2579 lt->sadb_lifetime_bytes = 0; 2580 lt->sadb_lifetime_addtime = sp->lifetime; 2581 lt->sadb_lifetime_usetime = sp->validtime; 2582 m_cat(result, m); 2583 2584 /* set sadb_address for source */ 2585 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2586 &sp->spidx.src.sa, 2587 sp->spidx.prefs, sp->spidx.ul_proto); 2588 if (!m) { 2589 error = ENOBUFS; 2590 goto fail; 2591 } 2592 m_cat(result, m); 2593 2594 /* set sadb_address for destination */ 2595 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2596 &sp->spidx.dst.sa, 2597 sp->spidx.prefd, sp->spidx.ul_proto); 2598 if (!m) { 2599 error = ENOBUFS; 2600 goto fail; 2601 } 2602 m_cat(result, m); 2603 2604 /* set secpolicy */ 2605 m = key_sp2msg(sp); 2606 if (!m) { 2607 error = ENOBUFS; 2608 goto fail; 2609 } 2610 m_cat(result, m); 2611 2612 if ((result->m_flags & M_PKTHDR) == 0) { 2613 error = EINVAL; 2614 goto fail; 2615 } 2616 2617 if (result->m_len < sizeof(struct sadb_msg)) { 2618 result = m_pullup(result, sizeof(struct sadb_msg)); 2619 if (result == NULL) { 2620 error = ENOBUFS; 2621 goto fail; 2622 } 2623 } 2624 2625 result->m_pkthdr.len = 0; 2626 for (m = result; m; m = m->m_next) 2627 result->m_pkthdr.len += m->m_len; 2628 2629 mtod(result, struct sadb_msg *)->sadb_msg_len = 2630 PFKEY_UNIT64(result->m_pkthdr.len); 2631 2632 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2633 2634 fail: 2635 if (result) 2636 m_freem(result); 2637 return error; 2638} 2639 2640/* %%% SAD management */ 2641/* 2642 * allocating a memory for new SA head, and copy from the values of mhp. 2643 * OUT: NULL : failure due to the lack of memory. 2644 * others : pointer to new SA head. 2645 */ 2646static struct secashead * 2647key_newsah(saidx) 2648 struct secasindex *saidx; 2649{ 2650 INIT_VNET_IPSEC(curvnet); 2651 struct secashead *newsah; 2652 2653 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2654 2655 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2656 if (newsah != NULL) { 2657 int i; 2658 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2659 LIST_INIT(&newsah->savtree[i]); 2660 newsah->saidx = *saidx; 2661 2662 /* add to saidxtree */ 2663 newsah->state = SADB_SASTATE_MATURE; 2664 2665 SAHTREE_LOCK(); 2666 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2667 SAHTREE_UNLOCK(); 2668 } 2669 return(newsah); 2670} 2671 2672/* 2673 * delete SA index and all SA registerd. 2674 */ 2675static void 2676key_delsah(sah) 2677 struct secashead *sah; 2678{ 2679 INIT_VNET_IPSEC(curvnet); 2680 struct secasvar *sav, *nextsav; 2681 u_int stateidx; 2682 int zombie = 0; 2683 2684 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2685 SAHTREE_LOCK_ASSERT(); 2686 2687 /* searching all SA registerd in the secindex. */ 2688 for (stateidx = 0; 2689 stateidx < _ARRAYLEN(saorder_state_any); 2690 stateidx++) { 2691 u_int state = saorder_state_any[stateidx]; 2692 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2693 if (sav->refcnt == 0) { 2694 /* sanity check */ 2695 KEY_CHKSASTATE(state, sav->state, __func__); 2696 /* 2697 * do NOT call KEY_FREESAV here: 2698 * it will only delete the sav if refcnt == 1, 2699 * where we already know that refcnt == 0 2700 */ 2701 key_delsav(sav); 2702 } else { 2703 /* give up to delete this sa */ 2704 zombie++; 2705 } 2706 } 2707 } 2708 if (!zombie) { /* delete only if there are savs */ 2709 /* remove from tree of SA index */ 2710 if (__LIST_CHAINED(sah)) 2711 LIST_REMOVE(sah, chain); 2712 if (sah->sa_route.ro_rt) { 2713 RTFREE(sah->sa_route.ro_rt); 2714 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2715 } 2716 free(sah, M_IPSEC_SAH); 2717 } 2718} 2719 2720/* 2721 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2722 * and copy the values of mhp into new buffer. 2723 * When SAD message type is GETSPI: 2724 * to set sequence number from acq_seq++, 2725 * to set zero to SPI. 2726 * not to call key_setsava(). 2727 * OUT: NULL : fail 2728 * others : pointer to new secasvar. 2729 * 2730 * does not modify mbuf. does not free mbuf on error. 2731 */ 2732static struct secasvar * 2733key_newsav(m, mhp, sah, errp, where, tag) 2734 struct mbuf *m; 2735 const struct sadb_msghdr *mhp; 2736 struct secashead *sah; 2737 int *errp; 2738 const char* where; 2739 int tag; 2740{ 2741 INIT_VNET_IPSEC(curvnet); 2742 struct secasvar *newsav; 2743 const struct sadb_sa *xsa; 2744 2745 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2746 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2747 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2748 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2749 2750 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2751 if (newsav == NULL) { 2752 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2753 *errp = ENOBUFS; 2754 goto done; 2755 } 2756 2757 switch (mhp->msg->sadb_msg_type) { 2758 case SADB_GETSPI: 2759 newsav->spi = 0; 2760 2761#ifdef IPSEC_DOSEQCHECK 2762 /* sync sequence number */ 2763 if (mhp->msg->sadb_msg_seq == 0) 2764 newsav->seq = 2765 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2766 else 2767#endif 2768 newsav->seq = mhp->msg->sadb_msg_seq; 2769 break; 2770 2771 case SADB_ADD: 2772 /* sanity check */ 2773 if (mhp->ext[SADB_EXT_SA] == NULL) { 2774 free(newsav, M_IPSEC_SA); 2775 newsav = NULL; 2776 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2777 __func__)); 2778 *errp = EINVAL; 2779 goto done; 2780 } 2781 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2782 newsav->spi = xsa->sadb_sa_spi; 2783 newsav->seq = mhp->msg->sadb_msg_seq; 2784 break; 2785 default: 2786 free(newsav, M_IPSEC_SA); 2787 newsav = NULL; 2788 *errp = EINVAL; 2789 goto done; 2790 } 2791 2792 2793 /* copy sav values */ 2794 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2795 *errp = key_setsaval(newsav, m, mhp); 2796 if (*errp) { 2797 free(newsav, M_IPSEC_SA); 2798 newsav = NULL; 2799 goto done; 2800 } 2801 } 2802 2803 SECASVAR_LOCK_INIT(newsav); 2804 2805 /* reset created */ 2806 newsav->created = time_second; 2807 newsav->pid = mhp->msg->sadb_msg_pid; 2808 2809 /* add to satree */ 2810 newsav->sah = sah; 2811 sa_initref(newsav); 2812 newsav->state = SADB_SASTATE_LARVAL; 2813 2814 /* XXX locking??? */ 2815 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2816 secasvar, chain); 2817done: 2818 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2819 printf("DP %s from %s:%u return SP:%p\n", __func__, 2820 where, tag, newsav)); 2821 2822 return newsav; 2823} 2824 2825/* 2826 * free() SA variable entry. 2827 */ 2828static void 2829key_cleansav(struct secasvar *sav) 2830{ 2831 /* 2832 * Cleanup xform state. Note that zeroize'ing causes the 2833 * keys to be cleared; otherwise we must do it ourself. 2834 */ 2835 if (sav->tdb_xform != NULL) { 2836 sav->tdb_xform->xf_zeroize(sav); 2837 sav->tdb_xform = NULL; 2838 } else { 2839 KASSERT(sav->iv == NULL, ("iv but no xform")); 2840 if (sav->key_auth != NULL) 2841 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2842 if (sav->key_enc != NULL) 2843 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2844 } 2845 if (sav->key_auth != NULL) { 2846 if (sav->key_auth->key_data != NULL) 2847 free(sav->key_auth->key_data, M_IPSEC_MISC); 2848 free(sav->key_auth, M_IPSEC_MISC); 2849 sav->key_auth = NULL; 2850 } 2851 if (sav->key_enc != NULL) { 2852 if (sav->key_enc->key_data != NULL) 2853 free(sav->key_enc->key_data, M_IPSEC_MISC); 2854 free(sav->key_enc, M_IPSEC_MISC); 2855 sav->key_enc = NULL; 2856 } 2857 if (sav->sched) { 2858 bzero(sav->sched, sav->schedlen); 2859 free(sav->sched, M_IPSEC_MISC); 2860 sav->sched = NULL; 2861 } 2862 if (sav->replay != NULL) { 2863 free(sav->replay, M_IPSEC_MISC); 2864 sav->replay = NULL; 2865 } 2866 if (sav->lft_c != NULL) { 2867 free(sav->lft_c, M_IPSEC_MISC); 2868 sav->lft_c = NULL; 2869 } 2870 if (sav->lft_h != NULL) { 2871 free(sav->lft_h, M_IPSEC_MISC); 2872 sav->lft_h = NULL; 2873 } 2874 if (sav->lft_s != NULL) { 2875 free(sav->lft_s, M_IPSEC_MISC); 2876 sav->lft_s = NULL; 2877 } 2878} 2879 2880/* 2881 * free() SA variable entry. 2882 */ 2883static void 2884key_delsav(sav) 2885 struct secasvar *sav; 2886{ 2887 IPSEC_ASSERT(sav != NULL, ("null sav")); 2888 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2889 2890 /* remove from SA header */ 2891 if (__LIST_CHAINED(sav)) 2892 LIST_REMOVE(sav, chain); 2893 key_cleansav(sav); 2894 SECASVAR_LOCK_DESTROY(sav); 2895 free(sav, M_IPSEC_SA); 2896} 2897 2898/* 2899 * search SAD. 2900 * OUT: 2901 * NULL : not found 2902 * others : found, pointer to a SA. 2903 */ 2904static struct secashead * 2905key_getsah(saidx) 2906 struct secasindex *saidx; 2907{ 2908 INIT_VNET_IPSEC(curvnet); 2909 struct secashead *sah; 2910 2911 SAHTREE_LOCK(); 2912 LIST_FOREACH(sah, &V_sahtree, chain) { 2913 if (sah->state == SADB_SASTATE_DEAD) 2914 continue; 2915 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2916 break; 2917 } 2918 SAHTREE_UNLOCK(); 2919 2920 return sah; 2921} 2922 2923/* 2924 * check not to be duplicated SPI. 2925 * NOTE: this function is too slow due to searching all SAD. 2926 * OUT: 2927 * NULL : not found 2928 * others : found, pointer to a SA. 2929 */ 2930static struct secasvar * 2931key_checkspidup(saidx, spi) 2932 struct secasindex *saidx; 2933 u_int32_t spi; 2934{ 2935 INIT_VNET_IPSEC(curvnet); 2936 struct secashead *sah; 2937 struct secasvar *sav; 2938 2939 /* check address family */ 2940 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2941 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2942 __func__)); 2943 return NULL; 2944 } 2945 2946 sav = NULL; 2947 /* check all SAD */ 2948 SAHTREE_LOCK(); 2949 LIST_FOREACH(sah, &V_sahtree, chain) { 2950 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2951 continue; 2952 sav = key_getsavbyspi(sah, spi); 2953 if (sav != NULL) 2954 break; 2955 } 2956 SAHTREE_UNLOCK(); 2957 2958 return sav; 2959} 2960 2961/* 2962 * search SAD litmited alive SA, protocol, SPI. 2963 * OUT: 2964 * NULL : not found 2965 * others : found, pointer to a SA. 2966 */ 2967static struct secasvar * 2968key_getsavbyspi(sah, spi) 2969 struct secashead *sah; 2970 u_int32_t spi; 2971{ 2972 INIT_VNET_IPSEC(curvnet); 2973 struct secasvar *sav; 2974 u_int stateidx, state; 2975 2976 sav = NULL; 2977 SAHTREE_LOCK_ASSERT(); 2978 /* search all status */ 2979 for (stateidx = 0; 2980 stateidx < _ARRAYLEN(saorder_state_alive); 2981 stateidx++) { 2982 2983 state = saorder_state_alive[stateidx]; 2984 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2985 2986 /* sanity check */ 2987 if (sav->state != state) { 2988 ipseclog((LOG_DEBUG, "%s: " 2989 "invalid sav->state (queue: %d SA: %d)\n", 2990 __func__, state, sav->state)); 2991 continue; 2992 } 2993 2994 if (sav->spi == spi) 2995 return sav; 2996 } 2997 } 2998 2999 return NULL; 3000} 3001 3002/* 3003 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3004 * You must update these if need. 3005 * OUT: 0: success. 3006 * !0: failure. 3007 * 3008 * does not modify mbuf. does not free mbuf on error. 3009 */ 3010static int 3011key_setsaval(sav, m, mhp) 3012 struct secasvar *sav; 3013 struct mbuf *m; 3014 const struct sadb_msghdr *mhp; 3015{ 3016 INIT_VNET_IPSEC(curvnet); 3017 int error = 0; 3018 3019 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3020 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3021 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3022 3023 /* initialization */ 3024 sav->replay = NULL; 3025 sav->key_auth = NULL; 3026 sav->key_enc = NULL; 3027 sav->sched = NULL; 3028 sav->schedlen = 0; 3029 sav->iv = NULL; 3030 sav->lft_c = NULL; 3031 sav->lft_h = NULL; 3032 sav->lft_s = NULL; 3033 sav->tdb_xform = NULL; /* transform */ 3034 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3035 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3036 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3037 3038 /* SA */ 3039 if (mhp->ext[SADB_EXT_SA] != NULL) { 3040 const struct sadb_sa *sa0; 3041 3042 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3043 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3044 error = EINVAL; 3045 goto fail; 3046 } 3047 3048 sav->alg_auth = sa0->sadb_sa_auth; 3049 sav->alg_enc = sa0->sadb_sa_encrypt; 3050 sav->flags = sa0->sadb_sa_flags; 3051 3052 /* replay window */ 3053 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3054 sav->replay = (struct secreplay *) 3055 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3056 if (sav->replay == NULL) { 3057 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3058 __func__)); 3059 error = ENOBUFS; 3060 goto fail; 3061 } 3062 if (sa0->sadb_sa_replay != 0) 3063 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3064 sav->replay->wsize = sa0->sadb_sa_replay; 3065 } 3066 } 3067 3068 /* Authentication keys */ 3069 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3070 const struct sadb_key *key0; 3071 int len; 3072 3073 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3074 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3075 3076 error = 0; 3077 if (len < sizeof(*key0)) { 3078 error = EINVAL; 3079 goto fail; 3080 } 3081 switch (mhp->msg->sadb_msg_satype) { 3082 case SADB_SATYPE_AH: 3083 case SADB_SATYPE_ESP: 3084 case SADB_X_SATYPE_TCPSIGNATURE: 3085 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3086 sav->alg_auth != SADB_X_AALG_NULL) 3087 error = EINVAL; 3088 break; 3089 case SADB_X_SATYPE_IPCOMP: 3090 default: 3091 error = EINVAL; 3092 break; 3093 } 3094 if (error) { 3095 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3096 __func__)); 3097 goto fail; 3098 } 3099 3100 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3101 M_IPSEC_MISC); 3102 if (sav->key_auth == NULL ) { 3103 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3104 __func__)); 3105 error = ENOBUFS; 3106 goto fail; 3107 } 3108 } 3109 3110 /* Encryption key */ 3111 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3112 const struct sadb_key *key0; 3113 int len; 3114 3115 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3116 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3117 3118 error = 0; 3119 if (len < sizeof(*key0)) { 3120 error = EINVAL; 3121 goto fail; 3122 } 3123 switch (mhp->msg->sadb_msg_satype) { 3124 case SADB_SATYPE_ESP: 3125 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3126 sav->alg_enc != SADB_EALG_NULL) { 3127 error = EINVAL; 3128 break; 3129 } 3130 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3131 len, 3132 M_IPSEC_MISC); 3133 if (sav->key_enc == NULL) { 3134 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3135 __func__)); 3136 error = ENOBUFS; 3137 goto fail; 3138 } 3139 break; 3140 case SADB_X_SATYPE_IPCOMP: 3141 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3142 error = EINVAL; 3143 sav->key_enc = NULL; /*just in case*/ 3144 break; 3145 case SADB_SATYPE_AH: 3146 case SADB_X_SATYPE_TCPSIGNATURE: 3147 default: 3148 error = EINVAL; 3149 break; 3150 } 3151 if (error) { 3152 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3153 __func__)); 3154 goto fail; 3155 } 3156 } 3157 3158 /* set iv */ 3159 sav->ivlen = 0; 3160 3161 switch (mhp->msg->sadb_msg_satype) { 3162 case SADB_SATYPE_AH: 3163 error = xform_init(sav, XF_AH); 3164 break; 3165 case SADB_SATYPE_ESP: 3166 error = xform_init(sav, XF_ESP); 3167 break; 3168 case SADB_X_SATYPE_IPCOMP: 3169 error = xform_init(sav, XF_IPCOMP); 3170 break; 3171 case SADB_X_SATYPE_TCPSIGNATURE: 3172 error = xform_init(sav, XF_TCPSIGNATURE); 3173 break; 3174 } 3175 if (error) { 3176 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3177 __func__, mhp->msg->sadb_msg_satype)); 3178 goto fail; 3179 } 3180 3181 /* reset created */ 3182 sav->created = time_second; 3183 3184 /* make lifetime for CURRENT */ 3185 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3186 if (sav->lft_c == NULL) { 3187 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3188 error = ENOBUFS; 3189 goto fail; 3190 } 3191 3192 sav->lft_c->allocations = 0; 3193 sav->lft_c->bytes = 0; 3194 sav->lft_c->addtime = time_second; 3195 sav->lft_c->usetime = 0; 3196 3197 /* lifetimes for HARD and SOFT */ 3198 { 3199 const struct sadb_lifetime *lft0; 3200 3201 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3202 if (lft0 != NULL) { 3203 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3204 error = EINVAL; 3205 goto fail; 3206 } 3207 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3208 if (sav->lft_h == NULL) { 3209 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3210 error = ENOBUFS; 3211 goto fail; 3212 } 3213 /* to be initialize ? */ 3214 } 3215 3216 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3217 if (lft0 != NULL) { 3218 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3219 error = EINVAL; 3220 goto fail; 3221 } 3222 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3223 if (sav->lft_s == NULL) { 3224 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3225 error = ENOBUFS; 3226 goto fail; 3227 } 3228 /* to be initialize ? */ 3229 } 3230 } 3231 3232 return 0; 3233 3234 fail: 3235 /* initialization */ 3236 key_cleansav(sav); 3237 3238 return error; 3239} 3240 3241/* 3242 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3243 * OUT: 0: valid 3244 * other: errno 3245 */ 3246static int 3247key_mature(struct secasvar *sav) 3248{ 3249 INIT_VNET_IPSEC(curvnet); 3250 int error; 3251 3252 /* check SPI value */ 3253 switch (sav->sah->saidx.proto) { 3254 case IPPROTO_ESP: 3255 case IPPROTO_AH: 3256 /* 3257 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3258 * 1-255 reserved by IANA for future use, 3259 * 0 for implementation specific, local use. 3260 */ 3261 if (ntohl(sav->spi) <= 255) { 3262 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3263 __func__, (u_int32_t)ntohl(sav->spi))); 3264 return EINVAL; 3265 } 3266 break; 3267 } 3268 3269 /* check satype */ 3270 switch (sav->sah->saidx.proto) { 3271 case IPPROTO_ESP: 3272 /* check flags */ 3273 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3274 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3275 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3276 "given to old-esp.\n", __func__)); 3277 return EINVAL; 3278 } 3279 error = xform_init(sav, XF_ESP); 3280 break; 3281 case IPPROTO_AH: 3282 /* check flags */ 3283 if (sav->flags & SADB_X_EXT_DERIV) { 3284 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3285 "given to AH SA.\n", __func__)); 3286 return EINVAL; 3287 } 3288 if (sav->alg_enc != SADB_EALG_NONE) { 3289 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3290 "mismated.\n", __func__)); 3291 return(EINVAL); 3292 } 3293 error = xform_init(sav, XF_AH); 3294 break; 3295 case IPPROTO_IPCOMP: 3296 if (sav->alg_auth != SADB_AALG_NONE) { 3297 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3298 "mismated.\n", __func__)); 3299 return(EINVAL); 3300 } 3301 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3302 && ntohl(sav->spi) >= 0x10000) { 3303 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3304 __func__)); 3305 return(EINVAL); 3306 } 3307 error = xform_init(sav, XF_IPCOMP); 3308 break; 3309 case IPPROTO_TCP: 3310 if (sav->alg_enc != SADB_EALG_NONE) { 3311 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3312 "mismated.\n", __func__)); 3313 return(EINVAL); 3314 } 3315 error = xform_init(sav, XF_TCPSIGNATURE); 3316 break; 3317 default: 3318 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3319 error = EPROTONOSUPPORT; 3320 break; 3321 } 3322 if (error == 0) { 3323 SAHTREE_LOCK(); 3324 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3325 SAHTREE_UNLOCK(); 3326 } 3327 return (error); 3328} 3329 3330/* 3331 * subroutine for SADB_GET and SADB_DUMP. 3332 */ 3333static struct mbuf * 3334key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3335 u_int32_t seq, u_int32_t pid) 3336{ 3337 struct mbuf *result = NULL, *tres = NULL, *m; 3338 int i; 3339 int dumporder[] = { 3340 SADB_EXT_SA, SADB_X_EXT_SA2, 3341 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3342 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3343 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3344 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3345 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3346 }; 3347 3348 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3349 if (m == NULL) 3350 goto fail; 3351 result = m; 3352 3353 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3354 m = NULL; 3355 switch (dumporder[i]) { 3356 case SADB_EXT_SA: 3357 m = key_setsadbsa(sav); 3358 if (!m) 3359 goto fail; 3360 break; 3361 3362 case SADB_X_EXT_SA2: 3363 m = key_setsadbxsa2(sav->sah->saidx.mode, 3364 sav->replay ? sav->replay->count : 0, 3365 sav->sah->saidx.reqid); 3366 if (!m) 3367 goto fail; 3368 break; 3369 3370 case SADB_EXT_ADDRESS_SRC: 3371 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3372 &sav->sah->saidx.src.sa, 3373 FULLMASK, IPSEC_ULPROTO_ANY); 3374 if (!m) 3375 goto fail; 3376 break; 3377 3378 case SADB_EXT_ADDRESS_DST: 3379 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3380 &sav->sah->saidx.dst.sa, 3381 FULLMASK, IPSEC_ULPROTO_ANY); 3382 if (!m) 3383 goto fail; 3384 break; 3385 3386 case SADB_EXT_KEY_AUTH: 3387 if (!sav->key_auth) 3388 continue; 3389 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3390 if (!m) 3391 goto fail; 3392 break; 3393 3394 case SADB_EXT_KEY_ENCRYPT: 3395 if (!sav->key_enc) 3396 continue; 3397 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3398 if (!m) 3399 goto fail; 3400 break; 3401 3402 case SADB_EXT_LIFETIME_CURRENT: 3403 if (!sav->lft_c) 3404 continue; 3405 m = key_setlifetime(sav->lft_c, 3406 SADB_EXT_LIFETIME_CURRENT); 3407 if (!m) 3408 goto fail; 3409 break; 3410 3411 case SADB_EXT_LIFETIME_HARD: 3412 if (!sav->lft_h) 3413 continue; 3414 m = key_setlifetime(sav->lft_h, 3415 SADB_EXT_LIFETIME_HARD); 3416 if (!m) 3417 goto fail; 3418 break; 3419 3420 case SADB_EXT_LIFETIME_SOFT: 3421 if (!sav->lft_s) 3422 continue; 3423 m = key_setlifetime(sav->lft_s, 3424 SADB_EXT_LIFETIME_SOFT); 3425 3426 if (!m) 3427 goto fail; 3428 break; 3429 3430 case SADB_EXT_ADDRESS_PROXY: 3431 case SADB_EXT_IDENTITY_SRC: 3432 case SADB_EXT_IDENTITY_DST: 3433 /* XXX: should we brought from SPD ? */ 3434 case SADB_EXT_SENSITIVITY: 3435 default: 3436 continue; 3437 } 3438 3439 if (!m) 3440 goto fail; 3441 if (tres) 3442 m_cat(m, tres); 3443 tres = m; 3444 3445 } 3446 3447 m_cat(result, tres); 3448 if (result->m_len < sizeof(struct sadb_msg)) { 3449 result = m_pullup(result, sizeof(struct sadb_msg)); 3450 if (result == NULL) 3451 goto fail; 3452 } 3453 3454 result->m_pkthdr.len = 0; 3455 for (m = result; m; m = m->m_next) 3456 result->m_pkthdr.len += m->m_len; 3457 3458 mtod(result, struct sadb_msg *)->sadb_msg_len = 3459 PFKEY_UNIT64(result->m_pkthdr.len); 3460 3461 return result; 3462 3463fail: 3464 m_freem(result); 3465 m_freem(tres); 3466 return NULL; 3467} 3468 3469/* 3470 * set data into sadb_msg. 3471 */ 3472static struct mbuf * 3473key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3474 pid_t pid, u_int16_t reserved) 3475{ 3476 struct mbuf *m; 3477 struct sadb_msg *p; 3478 int len; 3479 3480 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3481 if (len > MCLBYTES) 3482 return NULL; 3483 MGETHDR(m, M_DONTWAIT, MT_DATA); 3484 if (m && len > MHLEN) { 3485 MCLGET(m, M_DONTWAIT); 3486 if ((m->m_flags & M_EXT) == 0) { 3487 m_freem(m); 3488 m = NULL; 3489 } 3490 } 3491 if (!m) 3492 return NULL; 3493 m->m_pkthdr.len = m->m_len = len; 3494 m->m_next = NULL; 3495 3496 p = mtod(m, struct sadb_msg *); 3497 3498 bzero(p, len); 3499 p->sadb_msg_version = PF_KEY_V2; 3500 p->sadb_msg_type = type; 3501 p->sadb_msg_errno = 0; 3502 p->sadb_msg_satype = satype; 3503 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3504 p->sadb_msg_reserved = reserved; 3505 p->sadb_msg_seq = seq; 3506 p->sadb_msg_pid = (u_int32_t)pid; 3507 3508 return m; 3509} 3510 3511/* 3512 * copy secasvar data into sadb_address. 3513 */ 3514static struct mbuf * 3515key_setsadbsa(sav) 3516 struct secasvar *sav; 3517{ 3518 struct mbuf *m; 3519 struct sadb_sa *p; 3520 int len; 3521 3522 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3523 m = key_alloc_mbuf(len); 3524 if (!m || m->m_next) { /*XXX*/ 3525 if (m) 3526 m_freem(m); 3527 return NULL; 3528 } 3529 3530 p = mtod(m, struct sadb_sa *); 3531 3532 bzero(p, len); 3533 p->sadb_sa_len = PFKEY_UNIT64(len); 3534 p->sadb_sa_exttype = SADB_EXT_SA; 3535 p->sadb_sa_spi = sav->spi; 3536 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3537 p->sadb_sa_state = sav->state; 3538 p->sadb_sa_auth = sav->alg_auth; 3539 p->sadb_sa_encrypt = sav->alg_enc; 3540 p->sadb_sa_flags = sav->flags; 3541 3542 return m; 3543} 3544 3545/* 3546 * set data into sadb_address. 3547 */ 3548static struct mbuf * 3549key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3550{ 3551 struct mbuf *m; 3552 struct sadb_address *p; 3553 size_t len; 3554 3555 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3556 PFKEY_ALIGN8(saddr->sa_len); 3557 m = key_alloc_mbuf(len); 3558 if (!m || m->m_next) { /*XXX*/ 3559 if (m) 3560 m_freem(m); 3561 return NULL; 3562 } 3563 3564 p = mtod(m, struct sadb_address *); 3565 3566 bzero(p, len); 3567 p->sadb_address_len = PFKEY_UNIT64(len); 3568 p->sadb_address_exttype = exttype; 3569 p->sadb_address_proto = ul_proto; 3570 if (prefixlen == FULLMASK) { 3571 switch (saddr->sa_family) { 3572 case AF_INET: 3573 prefixlen = sizeof(struct in_addr) << 3; 3574 break; 3575 case AF_INET6: 3576 prefixlen = sizeof(struct in6_addr) << 3; 3577 break; 3578 default: 3579 ; /*XXX*/ 3580 } 3581 } 3582 p->sadb_address_prefixlen = prefixlen; 3583 p->sadb_address_reserved = 0; 3584 3585 bcopy(saddr, 3586 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3587 saddr->sa_len); 3588 3589 return m; 3590} 3591 3592/* 3593 * set data into sadb_x_sa2. 3594 */ 3595static struct mbuf * 3596key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3597{ 3598 struct mbuf *m; 3599 struct sadb_x_sa2 *p; 3600 size_t len; 3601 3602 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3603 m = key_alloc_mbuf(len); 3604 if (!m || m->m_next) { /*XXX*/ 3605 if (m) 3606 m_freem(m); 3607 return NULL; 3608 } 3609 3610 p = mtod(m, struct sadb_x_sa2 *); 3611 3612 bzero(p, len); 3613 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3614 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3615 p->sadb_x_sa2_mode = mode; 3616 p->sadb_x_sa2_reserved1 = 0; 3617 p->sadb_x_sa2_reserved2 = 0; 3618 p->sadb_x_sa2_sequence = seq; 3619 p->sadb_x_sa2_reqid = reqid; 3620 3621 return m; 3622} 3623 3624/* 3625 * set data into sadb_x_policy 3626 */ 3627static struct mbuf * 3628key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3629{ 3630 struct mbuf *m; 3631 struct sadb_x_policy *p; 3632 size_t len; 3633 3634 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3635 m = key_alloc_mbuf(len); 3636 if (!m || m->m_next) { /*XXX*/ 3637 if (m) 3638 m_freem(m); 3639 return NULL; 3640 } 3641 3642 p = mtod(m, struct sadb_x_policy *); 3643 3644 bzero(p, len); 3645 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3646 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3647 p->sadb_x_policy_type = type; 3648 p->sadb_x_policy_dir = dir; 3649 p->sadb_x_policy_id = id; 3650 3651 return m; 3652} 3653 3654/* %%% utilities */ 3655/* Take a key message (sadb_key) from the socket and turn it into one 3656 * of the kernel's key structures (seckey). 3657 * 3658 * IN: pointer to the src 3659 * OUT: NULL no more memory 3660 */ 3661struct seckey * 3662key_dup_keymsg(const struct sadb_key *src, u_int len, 3663 struct malloc_type *type) 3664{ 3665 INIT_VNET_IPSEC(curvnet); 3666 struct seckey *dst; 3667 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3668 if (dst != NULL) { 3669 dst->bits = src->sadb_key_bits; 3670 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3671 if (dst->key_data != NULL) { 3672 bcopy((const char *)src + sizeof(struct sadb_key), 3673 dst->key_data, len); 3674 } else { 3675 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3676 __func__)); 3677 free(dst, type); 3678 dst = NULL; 3679 } 3680 } else { 3681 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3682 __func__)); 3683 3684 } 3685 return dst; 3686} 3687 3688/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3689 * turn it into one of the kernel's lifetime structures (seclifetime). 3690 * 3691 * IN: pointer to the destination, source and malloc type 3692 * OUT: NULL, no more memory 3693 */ 3694 3695static struct seclifetime * 3696key_dup_lifemsg(const struct sadb_lifetime *src, 3697 struct malloc_type *type) 3698{ 3699 INIT_VNET_IPSEC(curvnet); 3700 struct seclifetime *dst = NULL; 3701 3702 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3703 type, M_NOWAIT); 3704 if (dst == NULL) { 3705 /* XXX counter */ 3706 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3707 } else { 3708 dst->allocations = src->sadb_lifetime_allocations; 3709 dst->bytes = src->sadb_lifetime_bytes; 3710 dst->addtime = src->sadb_lifetime_addtime; 3711 dst->usetime = src->sadb_lifetime_usetime; 3712 } 3713 return dst; 3714} 3715 3716/* compare my own address 3717 * OUT: 1: true, i.e. my address. 3718 * 0: false 3719 */ 3720int 3721key_ismyaddr(sa) 3722 struct sockaddr *sa; 3723{ 3724#ifdef INET 3725 INIT_VNET_INET(curvnet); 3726 struct sockaddr_in *sin; 3727 struct in_ifaddr *ia; 3728#endif 3729 3730 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3731 3732 switch (sa->sa_family) { 3733#ifdef INET 3734 case AF_INET: 3735 sin = (struct sockaddr_in *)sa; 3736 for (ia = V_in_ifaddrhead.tqh_first; ia; 3737 ia = ia->ia_link.tqe_next) 3738 { 3739 if (sin->sin_family == ia->ia_addr.sin_family && 3740 sin->sin_len == ia->ia_addr.sin_len && 3741 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3742 { 3743 return 1; 3744 } 3745 } 3746 break; 3747#endif 3748#ifdef INET6 3749 case AF_INET6: 3750 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3751#endif 3752 } 3753 3754 return 0; 3755} 3756 3757#ifdef INET6 3758/* 3759 * compare my own address for IPv6. 3760 * 1: ours 3761 * 0: other 3762 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3763 */ 3764#include <netinet6/in6_var.h> 3765 3766static int 3767key_ismyaddr6(sin6) 3768 struct sockaddr_in6 *sin6; 3769{ 3770 INIT_VNET_INET6(curvnet); 3771 struct in6_ifaddr *ia; 3772#if 0 3773 struct in6_multi *in6m; 3774#endif 3775 3776 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3777 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3778 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3779 return 1; 3780 3781#if 0 3782 /* 3783 * XXX Multicast 3784 * XXX why do we care about multlicast here while we don't care 3785 * about IPv4 multicast?? 3786 * XXX scope 3787 */ 3788 in6m = NULL; 3789 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3790 if (in6m) 3791 return 1; 3792#endif 3793 } 3794 3795 /* loopback, just for safety */ 3796 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3797 return 1; 3798 3799 return 0; 3800} 3801#endif /*INET6*/ 3802 3803/* 3804 * compare two secasindex structure. 3805 * flag can specify to compare 2 saidxes. 3806 * compare two secasindex structure without both mode and reqid. 3807 * don't compare port. 3808 * IN: 3809 * saidx0: source, it can be in SAD. 3810 * saidx1: object. 3811 * OUT: 3812 * 1 : equal 3813 * 0 : not equal 3814 */ 3815static int 3816key_cmpsaidx( 3817 const struct secasindex *saidx0, 3818 const struct secasindex *saidx1, 3819 int flag) 3820{ 3821 /* sanity */ 3822 if (saidx0 == NULL && saidx1 == NULL) 3823 return 1; 3824 3825 if (saidx0 == NULL || saidx1 == NULL) 3826 return 0; 3827 3828 if (saidx0->proto != saidx1->proto) 3829 return 0; 3830 3831 if (flag == CMP_EXACTLY) { 3832 if (saidx0->mode != saidx1->mode) 3833 return 0; 3834 if (saidx0->reqid != saidx1->reqid) 3835 return 0; 3836 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3837 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3838 return 0; 3839 } else { 3840 3841 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3842 if (flag == CMP_MODE_REQID 3843 ||flag == CMP_REQID) { 3844 /* 3845 * If reqid of SPD is non-zero, unique SA is required. 3846 * The result must be of same reqid in this case. 3847 */ 3848 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3849 return 0; 3850 } 3851 3852 if (flag == CMP_MODE_REQID) { 3853 if (saidx0->mode != IPSEC_MODE_ANY 3854 && saidx0->mode != saidx1->mode) 3855 return 0; 3856 } 3857 3858 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3859 return 0; 3860 } 3861 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3862 return 0; 3863 } 3864 } 3865 3866 return 1; 3867} 3868 3869/* 3870 * compare two secindex structure exactly. 3871 * IN: 3872 * spidx0: source, it is often in SPD. 3873 * spidx1: object, it is often from PFKEY message. 3874 * OUT: 3875 * 1 : equal 3876 * 0 : not equal 3877 */ 3878static int 3879key_cmpspidx_exactly( 3880 struct secpolicyindex *spidx0, 3881 struct secpolicyindex *spidx1) 3882{ 3883 /* sanity */ 3884 if (spidx0 == NULL && spidx1 == NULL) 3885 return 1; 3886 3887 if (spidx0 == NULL || spidx1 == NULL) 3888 return 0; 3889 3890 if (spidx0->prefs != spidx1->prefs 3891 || spidx0->prefd != spidx1->prefd 3892 || spidx0->ul_proto != spidx1->ul_proto) 3893 return 0; 3894 3895 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3896 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3897} 3898 3899/* 3900 * compare two secindex structure with mask. 3901 * IN: 3902 * spidx0: source, it is often in SPD. 3903 * spidx1: object, it is often from IP header. 3904 * OUT: 3905 * 1 : equal 3906 * 0 : not equal 3907 */ 3908static int 3909key_cmpspidx_withmask( 3910 struct secpolicyindex *spidx0, 3911 struct secpolicyindex *spidx1) 3912{ 3913 /* sanity */ 3914 if (spidx0 == NULL && spidx1 == NULL) 3915 return 1; 3916 3917 if (spidx0 == NULL || spidx1 == NULL) 3918 return 0; 3919 3920 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3921 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3922 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3923 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3924 return 0; 3925 3926 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3927 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3928 && spidx0->ul_proto != spidx1->ul_proto) 3929 return 0; 3930 3931 switch (spidx0->src.sa.sa_family) { 3932 case AF_INET: 3933 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3934 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3935 return 0; 3936 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3937 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3938 return 0; 3939 break; 3940 case AF_INET6: 3941 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3942 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3943 return 0; 3944 /* 3945 * scope_id check. if sin6_scope_id is 0, we regard it 3946 * as a wildcard scope, which matches any scope zone ID. 3947 */ 3948 if (spidx0->src.sin6.sin6_scope_id && 3949 spidx1->src.sin6.sin6_scope_id && 3950 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3951 return 0; 3952 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3953 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3954 return 0; 3955 break; 3956 default: 3957 /* XXX */ 3958 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3959 return 0; 3960 break; 3961 } 3962 3963 switch (spidx0->dst.sa.sa_family) { 3964 case AF_INET: 3965 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3966 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3967 return 0; 3968 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3969 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3970 return 0; 3971 break; 3972 case AF_INET6: 3973 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3974 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3975 return 0; 3976 /* 3977 * scope_id check. if sin6_scope_id is 0, we regard it 3978 * as a wildcard scope, which matches any scope zone ID. 3979 */ 3980 if (spidx0->dst.sin6.sin6_scope_id && 3981 spidx1->dst.sin6.sin6_scope_id && 3982 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3983 return 0; 3984 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3985 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3986 return 0; 3987 break; 3988 default: 3989 /* XXX */ 3990 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3991 return 0; 3992 break; 3993 } 3994 3995 /* XXX Do we check other field ? e.g. flowinfo */ 3996 3997 return 1; 3998} 3999 4000/* returns 0 on match */ 4001static int 4002key_sockaddrcmp( 4003 const struct sockaddr *sa1, 4004 const struct sockaddr *sa2, 4005 int port) 4006{ 4007#ifdef satosin 4008#undef satosin 4009#endif 4010#define satosin(s) ((const struct sockaddr_in *)s) 4011#ifdef satosin6 4012#undef satosin6 4013#endif 4014#define satosin6(s) ((const struct sockaddr_in6 *)s) 4015 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4016 return 1; 4017 4018 switch (sa1->sa_family) { 4019 case AF_INET: 4020 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4021 return 1; 4022 if (satosin(sa1)->sin_addr.s_addr != 4023 satosin(sa2)->sin_addr.s_addr) { 4024 return 1; 4025 } 4026 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4027 return 1; 4028 break; 4029 case AF_INET6: 4030 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4031 return 1; /*EINVAL*/ 4032 if (satosin6(sa1)->sin6_scope_id != 4033 satosin6(sa2)->sin6_scope_id) { 4034 return 1; 4035 } 4036 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4037 &satosin6(sa2)->sin6_addr)) { 4038 return 1; 4039 } 4040 if (port && 4041 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4042 return 1; 4043 } 4044 break; 4045 default: 4046 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4047 return 1; 4048 break; 4049 } 4050 4051 return 0; 4052#undef satosin 4053#undef satosin6 4054} 4055 4056/* 4057 * compare two buffers with mask. 4058 * IN: 4059 * addr1: source 4060 * addr2: object 4061 * bits: Number of bits to compare 4062 * OUT: 4063 * 1 : equal 4064 * 0 : not equal 4065 */ 4066static int 4067key_bbcmp(const void *a1, const void *a2, u_int bits) 4068{ 4069 const unsigned char *p1 = a1; 4070 const unsigned char *p2 = a2; 4071 4072 /* XXX: This could be considerably faster if we compare a word 4073 * at a time, but it is complicated on LSB Endian machines */ 4074 4075 /* Handle null pointers */ 4076 if (p1 == NULL || p2 == NULL) 4077 return (p1 == p2); 4078 4079 while (bits >= 8) { 4080 if (*p1++ != *p2++) 4081 return 0; 4082 bits -= 8; 4083 } 4084 4085 if (bits > 0) { 4086 u_int8_t mask = ~((1<<(8-bits))-1); 4087 if ((*p1 & mask) != (*p2 & mask)) 4088 return 0; 4089 } 4090 return 1; /* Match! */ 4091} 4092 4093static void 4094key_flush_spd(time_t now) 4095{ 4096 INIT_VNET_IPSEC(curvnet); 4097 static u_int16_t sptree_scangen = 0; 4098 u_int16_t gen = sptree_scangen++; 4099 struct secpolicy *sp; 4100 u_int dir; 4101 4102 /* SPD */ 4103 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4104restart: 4105 SPTREE_LOCK(); 4106 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4107 if (sp->scangen == gen) /* previously handled */ 4108 continue; 4109 sp->scangen = gen; 4110 if (sp->state == IPSEC_SPSTATE_DEAD && 4111 sp->refcnt == 1) { 4112 /* 4113 * Ensure that we only decrease refcnt once, 4114 * when we're the last consumer. 4115 * Directly call SP_DELREF/key_delsp instead 4116 * of KEY_FREESP to avoid unlocking/relocking 4117 * SPTREE_LOCK before key_delsp: may refcnt 4118 * be increased again during that time ? 4119 * NB: also clean entries created by 4120 * key_spdflush 4121 */ 4122 SP_DELREF(sp); 4123 key_delsp(sp); 4124 SPTREE_UNLOCK(); 4125 goto restart; 4126 } 4127 if (sp->lifetime == 0 && sp->validtime == 0) 4128 continue; 4129 if ((sp->lifetime && now - sp->created > sp->lifetime) 4130 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4131 sp->state = IPSEC_SPSTATE_DEAD; 4132 SPTREE_UNLOCK(); 4133 key_spdexpire(sp); 4134 goto restart; 4135 } 4136 } 4137 SPTREE_UNLOCK(); 4138 } 4139} 4140 4141static void 4142key_flush_sad(time_t now) 4143{ 4144 INIT_VNET_IPSEC(curvnet); 4145 struct secashead *sah, *nextsah; 4146 struct secasvar *sav, *nextsav; 4147 4148 /* SAD */ 4149 SAHTREE_LOCK(); 4150 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4151 /* if sah has been dead, then delete it and process next sah. */ 4152 if (sah->state == SADB_SASTATE_DEAD) { 4153 key_delsah(sah); 4154 continue; 4155 } 4156 4157 /* if LARVAL entry doesn't become MATURE, delete it. */ 4158 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4159 /* Need to also check refcnt for a larval SA ??? */ 4160 if (now - sav->created > V_key_larval_lifetime) 4161 KEY_FREESAV(&sav); 4162 } 4163 4164 /* 4165 * check MATURE entry to start to send expire message 4166 * whether or not. 4167 */ 4168 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4169 /* we don't need to check. */ 4170 if (sav->lft_s == NULL) 4171 continue; 4172 4173 /* sanity check */ 4174 if (sav->lft_c == NULL) { 4175 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4176 "time, why?\n", __func__)); 4177 continue; 4178 } 4179 4180 /* check SOFT lifetime */ 4181 if (sav->lft_s->addtime != 0 && 4182 now - sav->created > sav->lft_s->addtime) { 4183 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4184 /* 4185 * Actually, only send expire message if 4186 * SA has been used, as it was done before, 4187 * but should we always send such message, 4188 * and let IKE daemon decide if it should be 4189 * renegotiated or not ? 4190 * XXX expire message will actually NOT be 4191 * sent if SA is only used after soft 4192 * lifetime has been reached, see below 4193 * (DYING state) 4194 */ 4195 if (sav->lft_c->usetime != 0) 4196 key_expire(sav); 4197 } 4198 /* check SOFT lifetime by bytes */ 4199 /* 4200 * XXX I don't know the way to delete this SA 4201 * when new SA is installed. Caution when it's 4202 * installed too big lifetime by time. 4203 */ 4204 else if (sav->lft_s->bytes != 0 && 4205 sav->lft_s->bytes < sav->lft_c->bytes) { 4206 4207 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4208 /* 4209 * XXX If we keep to send expire 4210 * message in the status of 4211 * DYING. Do remove below code. 4212 */ 4213 key_expire(sav); 4214 } 4215 } 4216 4217 /* check DYING entry to change status to DEAD. */ 4218 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4219 /* we don't need to check. */ 4220 if (sav->lft_h == NULL) 4221 continue; 4222 4223 /* sanity check */ 4224 if (sav->lft_c == NULL) { 4225 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4226 "time, why?\n", __func__)); 4227 continue; 4228 } 4229 4230 if (sav->lft_h->addtime != 0 && 4231 now - sav->created > sav->lft_h->addtime) { 4232 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4233 KEY_FREESAV(&sav); 4234 } 4235#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4236 else if (sav->lft_s != NULL 4237 && sav->lft_s->addtime != 0 4238 && now - sav->created > sav->lft_s->addtime) { 4239 /* 4240 * XXX: should be checked to be 4241 * installed the valid SA. 4242 */ 4243 4244 /* 4245 * If there is no SA then sending 4246 * expire message. 4247 */ 4248 key_expire(sav); 4249 } 4250#endif 4251 /* check HARD lifetime by bytes */ 4252 else if (sav->lft_h->bytes != 0 && 4253 sav->lft_h->bytes < sav->lft_c->bytes) { 4254 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4255 KEY_FREESAV(&sav); 4256 } 4257 } 4258 4259 /* delete entry in DEAD */ 4260 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4261 /* sanity check */ 4262 if (sav->state != SADB_SASTATE_DEAD) { 4263 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4264 "(queue: %d SA: %d): kill it anyway\n", 4265 __func__, 4266 SADB_SASTATE_DEAD, sav->state)); 4267 } 4268 /* 4269 * do not call key_freesav() here. 4270 * sav should already be freed, and sav->refcnt 4271 * shows other references to sav 4272 * (such as from SPD). 4273 */ 4274 } 4275 } 4276 SAHTREE_UNLOCK(); 4277} 4278 4279static void 4280key_flush_acq(time_t now) 4281{ 4282 INIT_VNET_IPSEC(curvnet); 4283 struct secacq *acq, *nextacq; 4284 4285 /* ACQ tree */ 4286 ACQ_LOCK(); 4287 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4288 nextacq = LIST_NEXT(acq, chain); 4289 if (now - acq->created > V_key_blockacq_lifetime 4290 && __LIST_CHAINED(acq)) { 4291 LIST_REMOVE(acq, chain); 4292 free(acq, M_IPSEC_SAQ); 4293 } 4294 } 4295 ACQ_UNLOCK(); 4296} 4297 4298static void 4299key_flush_spacq(time_t now) 4300{ 4301 INIT_VNET_IPSEC(curvnet); 4302 struct secspacq *acq, *nextacq; 4303 4304 /* SP ACQ tree */ 4305 SPACQ_LOCK(); 4306 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4307 nextacq = LIST_NEXT(acq, chain); 4308 if (now - acq->created > V_key_blockacq_lifetime 4309 && __LIST_CHAINED(acq)) { 4310 LIST_REMOVE(acq, chain); 4311 free(acq, M_IPSEC_SAQ); 4312 } 4313 } 4314 SPACQ_UNLOCK(); 4315} 4316 4317/* 4318 * time handler. 4319 * scanning SPD and SAD to check status for each entries, 4320 * and do to remove or to expire. 4321 * XXX: year 2038 problem may remain. 4322 */ 4323void 4324key_timehandler(void) 4325{ 4326 VNET_ITERATOR_DECL(vnet_iter); 4327 time_t now = time_second; 4328 4329 VNET_LIST_RLOCK(); 4330 VNET_FOREACH(vnet_iter) { 4331 CURVNET_SET(vnet_iter); 4332 key_flush_spd(now); 4333 key_flush_sad(now); 4334 key_flush_acq(now); 4335 key_flush_spacq(now); 4336 CURVNET_RESTORE(); 4337 } 4338 VNET_LIST_RUNLOCK(); 4339 4340#ifndef IPSEC_DEBUG2 4341 /* do exchange to tick time !! */ 4342 (void)timeout((void *)key_timehandler, (void *)0, hz); 4343#endif /* IPSEC_DEBUG2 */ 4344} 4345 4346u_long 4347key_random() 4348{ 4349 u_long value; 4350 4351 key_randomfill(&value, sizeof(value)); 4352 return value; 4353} 4354 4355void 4356key_randomfill(p, l) 4357 void *p; 4358 size_t l; 4359{ 4360 size_t n; 4361 u_long v; 4362 static int warn = 1; 4363 4364 n = 0; 4365 n = (size_t)read_random(p, (u_int)l); 4366 /* last resort */ 4367 while (n < l) { 4368 v = random(); 4369 bcopy(&v, (u_int8_t *)p + n, 4370 l - n < sizeof(v) ? l - n : sizeof(v)); 4371 n += sizeof(v); 4372 4373 if (warn) { 4374 printf("WARNING: pseudo-random number generator " 4375 "used for IPsec processing\n"); 4376 warn = 0; 4377 } 4378 } 4379} 4380 4381/* 4382 * map SADB_SATYPE_* to IPPROTO_*. 4383 * if satype == SADB_SATYPE then satype is mapped to ~0. 4384 * OUT: 4385 * 0: invalid satype. 4386 */ 4387static u_int16_t 4388key_satype2proto(u_int8_t satype) 4389{ 4390 switch (satype) { 4391 case SADB_SATYPE_UNSPEC: 4392 return IPSEC_PROTO_ANY; 4393 case SADB_SATYPE_AH: 4394 return IPPROTO_AH; 4395 case SADB_SATYPE_ESP: 4396 return IPPROTO_ESP; 4397 case SADB_X_SATYPE_IPCOMP: 4398 return IPPROTO_IPCOMP; 4399 case SADB_X_SATYPE_TCPSIGNATURE: 4400 return IPPROTO_TCP; 4401 default: 4402 return 0; 4403 } 4404 /* NOTREACHED */ 4405} 4406 4407/* 4408 * map IPPROTO_* to SADB_SATYPE_* 4409 * OUT: 4410 * 0: invalid protocol type. 4411 */ 4412static u_int8_t 4413key_proto2satype(u_int16_t proto) 4414{ 4415 switch (proto) { 4416 case IPPROTO_AH: 4417 return SADB_SATYPE_AH; 4418 case IPPROTO_ESP: 4419 return SADB_SATYPE_ESP; 4420 case IPPROTO_IPCOMP: 4421 return SADB_X_SATYPE_IPCOMP; 4422 case IPPROTO_TCP: 4423 return SADB_X_SATYPE_TCPSIGNATURE; 4424 default: 4425 return 0; 4426 } 4427 /* NOTREACHED */ 4428} 4429 4430/* %%% PF_KEY */ 4431/* 4432 * SADB_GETSPI processing is to receive 4433 * <base, (SA2), src address, dst address, (SPI range)> 4434 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4435 * tree with the status of LARVAL, and send 4436 * <base, SA(*), address(SD)> 4437 * to the IKMPd. 4438 * 4439 * IN: mhp: pointer to the pointer to each header. 4440 * OUT: NULL if fail. 4441 * other if success, return pointer to the message to send. 4442 */ 4443static int 4444key_getspi(so, m, mhp) 4445 struct socket *so; 4446 struct mbuf *m; 4447 const struct sadb_msghdr *mhp; 4448{ 4449 INIT_VNET_IPSEC(curvnet); 4450 struct sadb_address *src0, *dst0; 4451 struct secasindex saidx; 4452 struct secashead *newsah; 4453 struct secasvar *newsav; 4454 u_int8_t proto; 4455 u_int32_t spi; 4456 u_int8_t mode; 4457 u_int32_t reqid; 4458 int error; 4459 4460 IPSEC_ASSERT(so != NULL, ("null socket")); 4461 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4462 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4463 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4464 4465 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4466 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4467 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4468 __func__)); 4469 return key_senderror(so, m, EINVAL); 4470 } 4471 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4472 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4473 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4474 __func__)); 4475 return key_senderror(so, m, EINVAL); 4476 } 4477 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4478 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4479 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4480 } else { 4481 mode = IPSEC_MODE_ANY; 4482 reqid = 0; 4483 } 4484 4485 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4486 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4487 4488 /* map satype to proto */ 4489 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4490 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4491 __func__)); 4492 return key_senderror(so, m, EINVAL); 4493 } 4494 4495 /* make sure if port number is zero. */ 4496 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4497 case AF_INET: 4498 if (((struct sockaddr *)(src0 + 1))->sa_len != 4499 sizeof(struct sockaddr_in)) 4500 return key_senderror(so, m, EINVAL); 4501 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4502 break; 4503 case AF_INET6: 4504 if (((struct sockaddr *)(src0 + 1))->sa_len != 4505 sizeof(struct sockaddr_in6)) 4506 return key_senderror(so, m, EINVAL); 4507 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4508 break; 4509 default: 4510 ; /*???*/ 4511 } 4512 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4513 case AF_INET: 4514 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4515 sizeof(struct sockaddr_in)) 4516 return key_senderror(so, m, EINVAL); 4517 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4518 break; 4519 case AF_INET6: 4520 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4521 sizeof(struct sockaddr_in6)) 4522 return key_senderror(so, m, EINVAL); 4523 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4524 break; 4525 default: 4526 ; /*???*/ 4527 } 4528 4529 /* XXX boundary check against sa_len */ 4530 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4531 4532 /* SPI allocation */ 4533 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4534 &saidx); 4535 if (spi == 0) 4536 return key_senderror(so, m, EINVAL); 4537 4538 /* get a SA index */ 4539 if ((newsah = key_getsah(&saidx)) == NULL) { 4540 /* create a new SA index */ 4541 if ((newsah = key_newsah(&saidx)) == NULL) { 4542 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4543 return key_senderror(so, m, ENOBUFS); 4544 } 4545 } 4546 4547 /* get a new SA */ 4548 /* XXX rewrite */ 4549 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4550 if (newsav == NULL) { 4551 /* XXX don't free new SA index allocated in above. */ 4552 return key_senderror(so, m, error); 4553 } 4554 4555 /* set spi */ 4556 newsav->spi = htonl(spi); 4557 4558 /* delete the entry in acqtree */ 4559 if (mhp->msg->sadb_msg_seq != 0) { 4560 struct secacq *acq; 4561 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4562 /* reset counter in order to deletion by timehandler. */ 4563 acq->created = time_second; 4564 acq->count = 0; 4565 } 4566 } 4567 4568 { 4569 struct mbuf *n, *nn; 4570 struct sadb_sa *m_sa; 4571 struct sadb_msg *newmsg; 4572 int off, len; 4573 4574 /* create new sadb_msg to reply. */ 4575 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4576 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4577 4578 MGETHDR(n, M_DONTWAIT, MT_DATA); 4579 if (len > MHLEN) { 4580 MCLGET(n, M_DONTWAIT); 4581 if ((n->m_flags & M_EXT) == 0) { 4582 m_freem(n); 4583 n = NULL; 4584 } 4585 } 4586 if (!n) 4587 return key_senderror(so, m, ENOBUFS); 4588 4589 n->m_len = len; 4590 n->m_next = NULL; 4591 off = 0; 4592 4593 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4594 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4595 4596 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4597 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4598 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4599 m_sa->sadb_sa_spi = htonl(spi); 4600 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4601 4602 IPSEC_ASSERT(off == len, 4603 ("length inconsistency (off %u len %u)", off, len)); 4604 4605 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4606 SADB_EXT_ADDRESS_DST); 4607 if (!n->m_next) { 4608 m_freem(n); 4609 return key_senderror(so, m, ENOBUFS); 4610 } 4611 4612 if (n->m_len < sizeof(struct sadb_msg)) { 4613 n = m_pullup(n, sizeof(struct sadb_msg)); 4614 if (n == NULL) 4615 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4616 } 4617 4618 n->m_pkthdr.len = 0; 4619 for (nn = n; nn; nn = nn->m_next) 4620 n->m_pkthdr.len += nn->m_len; 4621 4622 newmsg = mtod(n, struct sadb_msg *); 4623 newmsg->sadb_msg_seq = newsav->seq; 4624 newmsg->sadb_msg_errno = 0; 4625 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4626 4627 m_freem(m); 4628 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4629 } 4630} 4631 4632/* 4633 * allocating new SPI 4634 * called by key_getspi(). 4635 * OUT: 4636 * 0: failure. 4637 * others: success. 4638 */ 4639static u_int32_t 4640key_do_getnewspi(spirange, saidx) 4641 struct sadb_spirange *spirange; 4642 struct secasindex *saidx; 4643{ 4644 INIT_VNET_IPSEC(curvnet); 4645 u_int32_t newspi; 4646 u_int32_t min, max; 4647 int count = V_key_spi_trycnt; 4648 4649 /* set spi range to allocate */ 4650 if (spirange != NULL) { 4651 min = spirange->sadb_spirange_min; 4652 max = spirange->sadb_spirange_max; 4653 } else { 4654 min = V_key_spi_minval; 4655 max = V_key_spi_maxval; 4656 } 4657 /* IPCOMP needs 2-byte SPI */ 4658 if (saidx->proto == IPPROTO_IPCOMP) { 4659 u_int32_t t; 4660 if (min >= 0x10000) 4661 min = 0xffff; 4662 if (max >= 0x10000) 4663 max = 0xffff; 4664 if (min > max) { 4665 t = min; min = max; max = t; 4666 } 4667 } 4668 4669 if (min == max) { 4670 if (key_checkspidup(saidx, min) != NULL) { 4671 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4672 __func__, min)); 4673 return 0; 4674 } 4675 4676 count--; /* taking one cost. */ 4677 newspi = min; 4678 4679 } else { 4680 4681 /* init SPI */ 4682 newspi = 0; 4683 4684 /* when requesting to allocate spi ranged */ 4685 while (count--) { 4686 /* generate pseudo-random SPI value ranged. */ 4687 newspi = min + (key_random() % (max - min + 1)); 4688 4689 if (key_checkspidup(saidx, newspi) == NULL) 4690 break; 4691 } 4692 4693 if (count == 0 || newspi == 0) { 4694 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4695 __func__)); 4696 return 0; 4697 } 4698 } 4699 4700 /* statistics */ 4701 keystat.getspi_count = 4702 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4703 4704 return newspi; 4705} 4706 4707/* 4708 * SADB_UPDATE processing 4709 * receive 4710 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4711 * key(AE), (identity(SD),) (sensitivity)> 4712 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4713 * and send 4714 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4715 * (identity(SD),) (sensitivity)> 4716 * to the ikmpd. 4717 * 4718 * m will always be freed. 4719 */ 4720static int 4721key_update(so, m, mhp) 4722 struct socket *so; 4723 struct mbuf *m; 4724 const struct sadb_msghdr *mhp; 4725{ 4726 INIT_VNET_IPSEC(curvnet); 4727 struct sadb_sa *sa0; 4728 struct sadb_address *src0, *dst0; 4729 struct secasindex saidx; 4730 struct secashead *sah; 4731 struct secasvar *sav; 4732 u_int16_t proto; 4733 u_int8_t mode; 4734 u_int32_t reqid; 4735 int error; 4736 4737 IPSEC_ASSERT(so != NULL, ("null socket")); 4738 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4739 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4740 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4741 4742 /* map satype to proto */ 4743 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4744 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4745 __func__)); 4746 return key_senderror(so, m, EINVAL); 4747 } 4748 4749 if (mhp->ext[SADB_EXT_SA] == NULL || 4750 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4751 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4752 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4753 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4754 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4755 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4756 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4757 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4758 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4759 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4760 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4761 __func__)); 4762 return key_senderror(so, m, EINVAL); 4763 } 4764 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4765 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4766 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4767 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4768 __func__)); 4769 return key_senderror(so, m, EINVAL); 4770 } 4771 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4772 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4773 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4774 } else { 4775 mode = IPSEC_MODE_ANY; 4776 reqid = 0; 4777 } 4778 /* XXX boundary checking for other extensions */ 4779 4780 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4781 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4782 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4783 4784 /* XXX boundary check against sa_len */ 4785 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4786 4787 /* get a SA header */ 4788 if ((sah = key_getsah(&saidx)) == NULL) { 4789 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4790 return key_senderror(so, m, ENOENT); 4791 } 4792 4793 /* set spidx if there */ 4794 /* XXX rewrite */ 4795 error = key_setident(sah, m, mhp); 4796 if (error) 4797 return key_senderror(so, m, error); 4798 4799 /* find a SA with sequence number. */ 4800#ifdef IPSEC_DOSEQCHECK 4801 if (mhp->msg->sadb_msg_seq != 0 4802 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4803 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4804 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4805 return key_senderror(so, m, ENOENT); 4806 } 4807#else 4808 SAHTREE_LOCK(); 4809 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4810 SAHTREE_UNLOCK(); 4811 if (sav == NULL) { 4812 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4813 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4814 return key_senderror(so, m, EINVAL); 4815 } 4816#endif 4817 4818 /* validity check */ 4819 if (sav->sah->saidx.proto != proto) { 4820 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4821 "(DB=%u param=%u)\n", __func__, 4822 sav->sah->saidx.proto, proto)); 4823 return key_senderror(so, m, EINVAL); 4824 } 4825#ifdef IPSEC_DOSEQCHECK 4826 if (sav->spi != sa0->sadb_sa_spi) { 4827 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4828 __func__, 4829 (u_int32_t)ntohl(sav->spi), 4830 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4831 return key_senderror(so, m, EINVAL); 4832 } 4833#endif 4834 if (sav->pid != mhp->msg->sadb_msg_pid) { 4835 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4836 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4837 return key_senderror(so, m, EINVAL); 4838 } 4839 4840 /* copy sav values */ 4841 error = key_setsaval(sav, m, mhp); 4842 if (error) { 4843 KEY_FREESAV(&sav); 4844 return key_senderror(so, m, error); 4845 } 4846 4847 /* check SA values to be mature. */ 4848 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4849 KEY_FREESAV(&sav); 4850 return key_senderror(so, m, 0); 4851 } 4852 4853 { 4854 struct mbuf *n; 4855 4856 /* set msg buf from mhp */ 4857 n = key_getmsgbuf_x1(m, mhp); 4858 if (n == NULL) { 4859 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4860 return key_senderror(so, m, ENOBUFS); 4861 } 4862 4863 m_freem(m); 4864 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4865 } 4866} 4867 4868/* 4869 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4870 * only called by key_update(). 4871 * OUT: 4872 * NULL : not found 4873 * others : found, pointer to a SA. 4874 */ 4875#ifdef IPSEC_DOSEQCHECK 4876static struct secasvar * 4877key_getsavbyseq(sah, seq) 4878 struct secashead *sah; 4879 u_int32_t seq; 4880{ 4881 struct secasvar *sav; 4882 u_int state; 4883 4884 state = SADB_SASTATE_LARVAL; 4885 4886 /* search SAD with sequence number ? */ 4887 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4888 4889 KEY_CHKSASTATE(state, sav->state, __func__); 4890 4891 if (sav->seq == seq) { 4892 sa_addref(sav); 4893 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4894 printf("DP %s cause refcnt++:%d SA:%p\n", 4895 __func__, sav->refcnt, sav)); 4896 return sav; 4897 } 4898 } 4899 4900 return NULL; 4901} 4902#endif 4903 4904/* 4905 * SADB_ADD processing 4906 * add an entry to SA database, when received 4907 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4908 * key(AE), (identity(SD),) (sensitivity)> 4909 * from the ikmpd, 4910 * and send 4911 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4912 * (identity(SD),) (sensitivity)> 4913 * to the ikmpd. 4914 * 4915 * IGNORE identity and sensitivity messages. 4916 * 4917 * m will always be freed. 4918 */ 4919static int 4920key_add(so, m, mhp) 4921 struct socket *so; 4922 struct mbuf *m; 4923 const struct sadb_msghdr *mhp; 4924{ 4925 INIT_VNET_IPSEC(curvnet); 4926 struct sadb_sa *sa0; 4927 struct sadb_address *src0, *dst0; 4928 struct secasindex saidx; 4929 struct secashead *newsah; 4930 struct secasvar *newsav; 4931 u_int16_t proto; 4932 u_int8_t mode; 4933 u_int32_t reqid; 4934 int error; 4935 4936 IPSEC_ASSERT(so != NULL, ("null socket")); 4937 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4938 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4939 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4940 4941 /* map satype to proto */ 4942 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4943 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4944 __func__)); 4945 return key_senderror(so, m, EINVAL); 4946 } 4947 4948 if (mhp->ext[SADB_EXT_SA] == NULL || 4949 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4950 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4951 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4952 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4953 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4954 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4955 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4956 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4957 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4958 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4959 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4960 __func__)); 4961 return key_senderror(so, m, EINVAL); 4962 } 4963 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4964 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4965 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4966 /* XXX need more */ 4967 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4968 __func__)); 4969 return key_senderror(so, m, EINVAL); 4970 } 4971 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4972 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4973 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4974 } else { 4975 mode = IPSEC_MODE_ANY; 4976 reqid = 0; 4977 } 4978 4979 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4980 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4981 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4982 4983 /* XXX boundary check against sa_len */ 4984 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4985 4986 /* get a SA header */ 4987 if ((newsah = key_getsah(&saidx)) == NULL) { 4988 /* create a new SA header */ 4989 if ((newsah = key_newsah(&saidx)) == NULL) { 4990 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4991 return key_senderror(so, m, ENOBUFS); 4992 } 4993 } 4994 4995 /* set spidx if there */ 4996 /* XXX rewrite */ 4997 error = key_setident(newsah, m, mhp); 4998 if (error) { 4999 return key_senderror(so, m, error); 5000 } 5001 5002 /* create new SA entry. */ 5003 /* We can create new SA only if SPI is differenct. */ 5004 SAHTREE_LOCK(); 5005 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5006 SAHTREE_UNLOCK(); 5007 if (newsav != NULL) { 5008 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5009 return key_senderror(so, m, EEXIST); 5010 } 5011 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5012 if (newsav == NULL) { 5013 return key_senderror(so, m, error); 5014 } 5015 5016 /* check SA values to be mature. */ 5017 if ((error = key_mature(newsav)) != 0) { 5018 KEY_FREESAV(&newsav); 5019 return key_senderror(so, m, error); 5020 } 5021 5022 /* 5023 * don't call key_freesav() here, as we would like to keep the SA 5024 * in the database on success. 5025 */ 5026 5027 { 5028 struct mbuf *n; 5029 5030 /* set msg buf from mhp */ 5031 n = key_getmsgbuf_x1(m, mhp); 5032 if (n == NULL) { 5033 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5034 return key_senderror(so, m, ENOBUFS); 5035 } 5036 5037 m_freem(m); 5038 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5039 } 5040} 5041 5042/* m is retained */ 5043static int 5044key_setident(sah, m, mhp) 5045 struct secashead *sah; 5046 struct mbuf *m; 5047 const struct sadb_msghdr *mhp; 5048{ 5049 INIT_VNET_IPSEC(curvnet); 5050 const struct sadb_ident *idsrc, *iddst; 5051 int idsrclen, iddstlen; 5052 5053 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5054 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5055 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5056 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5057 5058 /* don't make buffer if not there */ 5059 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5060 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5061 sah->idents = NULL; 5062 sah->identd = NULL; 5063 return 0; 5064 } 5065 5066 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5067 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5068 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5069 return EINVAL; 5070 } 5071 5072 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5073 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5074 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5075 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5076 5077 /* validity check */ 5078 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5079 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5080 return EINVAL; 5081 } 5082 5083 switch (idsrc->sadb_ident_type) { 5084 case SADB_IDENTTYPE_PREFIX: 5085 case SADB_IDENTTYPE_FQDN: 5086 case SADB_IDENTTYPE_USERFQDN: 5087 default: 5088 /* XXX do nothing */ 5089 sah->idents = NULL; 5090 sah->identd = NULL; 5091 return 0; 5092 } 5093 5094 /* make structure */ 5095 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5096 if (sah->idents == NULL) { 5097 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5098 return ENOBUFS; 5099 } 5100 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5101 if (sah->identd == NULL) { 5102 free(sah->idents, M_IPSEC_MISC); 5103 sah->idents = NULL; 5104 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5105 return ENOBUFS; 5106 } 5107 sah->idents->type = idsrc->sadb_ident_type; 5108 sah->idents->id = idsrc->sadb_ident_id; 5109 5110 sah->identd->type = iddst->sadb_ident_type; 5111 sah->identd->id = iddst->sadb_ident_id; 5112 5113 return 0; 5114} 5115 5116/* 5117 * m will not be freed on return. 5118 * it is caller's responsibility to free the result. 5119 */ 5120static struct mbuf * 5121key_getmsgbuf_x1(m, mhp) 5122 struct mbuf *m; 5123 const struct sadb_msghdr *mhp; 5124{ 5125 struct mbuf *n; 5126 5127 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5128 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5129 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5130 5131 /* create new sadb_msg to reply. */ 5132 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5133 SADB_EXT_SA, SADB_X_EXT_SA2, 5134 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5135 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5136 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5137 if (!n) 5138 return NULL; 5139 5140 if (n->m_len < sizeof(struct sadb_msg)) { 5141 n = m_pullup(n, sizeof(struct sadb_msg)); 5142 if (n == NULL) 5143 return NULL; 5144 } 5145 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5146 mtod(n, struct sadb_msg *)->sadb_msg_len = 5147 PFKEY_UNIT64(n->m_pkthdr.len); 5148 5149 return n; 5150} 5151 5152static int key_delete_all __P((struct socket *, struct mbuf *, 5153 const struct sadb_msghdr *, u_int16_t)); 5154 5155/* 5156 * SADB_DELETE processing 5157 * receive 5158 * <base, SA(*), address(SD)> 5159 * from the ikmpd, and set SADB_SASTATE_DEAD, 5160 * and send, 5161 * <base, SA(*), address(SD)> 5162 * to the ikmpd. 5163 * 5164 * m will always be freed. 5165 */ 5166static int 5167key_delete(so, m, mhp) 5168 struct socket *so; 5169 struct mbuf *m; 5170 const struct sadb_msghdr *mhp; 5171{ 5172 INIT_VNET_IPSEC(curvnet); 5173 struct sadb_sa *sa0; 5174 struct sadb_address *src0, *dst0; 5175 struct secasindex saidx; 5176 struct secashead *sah; 5177 struct secasvar *sav = NULL; 5178 u_int16_t proto; 5179 5180 IPSEC_ASSERT(so != NULL, ("null socket")); 5181 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5182 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5183 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5184 5185 /* map satype to proto */ 5186 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5187 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5188 __func__)); 5189 return key_senderror(so, m, EINVAL); 5190 } 5191 5192 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5193 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5194 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5195 __func__)); 5196 return key_senderror(so, m, EINVAL); 5197 } 5198 5199 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5200 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5201 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5202 __func__)); 5203 return key_senderror(so, m, EINVAL); 5204 } 5205 5206 if (mhp->ext[SADB_EXT_SA] == NULL) { 5207 /* 5208 * Caller wants us to delete all non-LARVAL SAs 5209 * that match the src/dst. This is used during 5210 * IKE INITIAL-CONTACT. 5211 */ 5212 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5213 return key_delete_all(so, m, mhp, proto); 5214 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5215 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5216 __func__)); 5217 return key_senderror(so, m, EINVAL); 5218 } 5219 5220 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5221 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5222 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5223 5224 /* XXX boundary check against sa_len */ 5225 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5226 5227 /* get a SA header */ 5228 SAHTREE_LOCK(); 5229 LIST_FOREACH(sah, &V_sahtree, chain) { 5230 if (sah->state == SADB_SASTATE_DEAD) 5231 continue; 5232 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5233 continue; 5234 5235 /* get a SA with SPI. */ 5236 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5237 if (sav) 5238 break; 5239 } 5240 if (sah == NULL) { 5241 SAHTREE_UNLOCK(); 5242 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5243 return key_senderror(so, m, ENOENT); 5244 } 5245 5246 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5247 SAHTREE_UNLOCK(); 5248 KEY_FREESAV(&sav); 5249 5250 { 5251 struct mbuf *n; 5252 struct sadb_msg *newmsg; 5253 5254 /* create new sadb_msg to reply. */ 5255 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5256 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5257 if (!n) 5258 return key_senderror(so, m, ENOBUFS); 5259 5260 if (n->m_len < sizeof(struct sadb_msg)) { 5261 n = m_pullup(n, sizeof(struct sadb_msg)); 5262 if (n == NULL) 5263 return key_senderror(so, m, ENOBUFS); 5264 } 5265 newmsg = mtod(n, struct sadb_msg *); 5266 newmsg->sadb_msg_errno = 0; 5267 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5268 5269 m_freem(m); 5270 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5271 } 5272} 5273 5274/* 5275 * delete all SAs for src/dst. Called from key_delete(). 5276 */ 5277static int 5278key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5279 u_int16_t proto) 5280{ 5281 INIT_VNET_IPSEC(curvnet); 5282 struct sadb_address *src0, *dst0; 5283 struct secasindex saidx; 5284 struct secashead *sah; 5285 struct secasvar *sav, *nextsav; 5286 u_int stateidx, state; 5287 5288 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5289 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5290 5291 /* XXX boundary check against sa_len */ 5292 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5293 5294 SAHTREE_LOCK(); 5295 LIST_FOREACH(sah, &V_sahtree, chain) { 5296 if (sah->state == SADB_SASTATE_DEAD) 5297 continue; 5298 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5299 continue; 5300 5301 /* Delete all non-LARVAL SAs. */ 5302 for (stateidx = 0; 5303 stateidx < _ARRAYLEN(saorder_state_alive); 5304 stateidx++) { 5305 state = saorder_state_alive[stateidx]; 5306 if (state == SADB_SASTATE_LARVAL) 5307 continue; 5308 for (sav = LIST_FIRST(&sah->savtree[state]); 5309 sav != NULL; sav = nextsav) { 5310 nextsav = LIST_NEXT(sav, chain); 5311 /* sanity check */ 5312 if (sav->state != state) { 5313 ipseclog((LOG_DEBUG, "%s: invalid " 5314 "sav->state (queue %d SA %d)\n", 5315 __func__, state, sav->state)); 5316 continue; 5317 } 5318 5319 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5320 KEY_FREESAV(&sav); 5321 } 5322 } 5323 } 5324 SAHTREE_UNLOCK(); 5325 { 5326 struct mbuf *n; 5327 struct sadb_msg *newmsg; 5328 5329 /* create new sadb_msg to reply. */ 5330 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5331 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5332 if (!n) 5333 return key_senderror(so, m, ENOBUFS); 5334 5335 if (n->m_len < sizeof(struct sadb_msg)) { 5336 n = m_pullup(n, sizeof(struct sadb_msg)); 5337 if (n == NULL) 5338 return key_senderror(so, m, ENOBUFS); 5339 } 5340 newmsg = mtod(n, struct sadb_msg *); 5341 newmsg->sadb_msg_errno = 0; 5342 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5343 5344 m_freem(m); 5345 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5346 } 5347} 5348 5349/* 5350 * SADB_GET processing 5351 * receive 5352 * <base, SA(*), address(SD)> 5353 * from the ikmpd, and get a SP and a SA to respond, 5354 * and send, 5355 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5356 * (identity(SD),) (sensitivity)> 5357 * to the ikmpd. 5358 * 5359 * m will always be freed. 5360 */ 5361static int 5362key_get(so, m, mhp) 5363 struct socket *so; 5364 struct mbuf *m; 5365 const struct sadb_msghdr *mhp; 5366{ 5367 INIT_VNET_IPSEC(curvnet); 5368 struct sadb_sa *sa0; 5369 struct sadb_address *src0, *dst0; 5370 struct secasindex saidx; 5371 struct secashead *sah; 5372 struct secasvar *sav = NULL; 5373 u_int16_t proto; 5374 5375 IPSEC_ASSERT(so != NULL, ("null socket")); 5376 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5377 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5378 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5379 5380 /* map satype to proto */ 5381 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5382 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5383 __func__)); 5384 return key_senderror(so, m, EINVAL); 5385 } 5386 5387 if (mhp->ext[SADB_EXT_SA] == NULL || 5388 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5389 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5390 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5391 __func__)); 5392 return key_senderror(so, m, EINVAL); 5393 } 5394 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5395 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5396 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5397 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5398 __func__)); 5399 return key_senderror(so, m, EINVAL); 5400 } 5401 5402 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5403 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5404 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5405 5406 /* XXX boundary check against sa_len */ 5407 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5408 5409 /* get a SA header */ 5410 SAHTREE_LOCK(); 5411 LIST_FOREACH(sah, &V_sahtree, chain) { 5412 if (sah->state == SADB_SASTATE_DEAD) 5413 continue; 5414 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5415 continue; 5416 5417 /* get a SA with SPI. */ 5418 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5419 if (sav) 5420 break; 5421 } 5422 SAHTREE_UNLOCK(); 5423 if (sah == NULL) { 5424 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5425 return key_senderror(so, m, ENOENT); 5426 } 5427 5428 { 5429 struct mbuf *n; 5430 u_int8_t satype; 5431 5432 /* map proto to satype */ 5433 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5434 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5435 __func__)); 5436 return key_senderror(so, m, EINVAL); 5437 } 5438 5439 /* create new sadb_msg to reply. */ 5440 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5441 mhp->msg->sadb_msg_pid); 5442 if (!n) 5443 return key_senderror(so, m, ENOBUFS); 5444 5445 m_freem(m); 5446 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5447 } 5448} 5449 5450/* XXX make it sysctl-configurable? */ 5451static void 5452key_getcomb_setlifetime(comb) 5453 struct sadb_comb *comb; 5454{ 5455 5456 comb->sadb_comb_soft_allocations = 1; 5457 comb->sadb_comb_hard_allocations = 1; 5458 comb->sadb_comb_soft_bytes = 0; 5459 comb->sadb_comb_hard_bytes = 0; 5460 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5461 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5462 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5463 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5464} 5465 5466/* 5467 * XXX reorder combinations by preference 5468 * XXX no idea if the user wants ESP authentication or not 5469 */ 5470static struct mbuf * 5471key_getcomb_esp() 5472{ 5473 INIT_VNET_IPSEC(curvnet); 5474 struct sadb_comb *comb; 5475 struct enc_xform *algo; 5476 struct mbuf *result = NULL, *m, *n; 5477 int encmin; 5478 int i, off, o; 5479 int totlen; 5480 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5481 5482 m = NULL; 5483 for (i = 1; i <= SADB_EALG_MAX; i++) { 5484 algo = esp_algorithm_lookup(i); 5485 if (algo == NULL) 5486 continue; 5487 5488 /* discard algorithms with key size smaller than system min */ 5489 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5490 continue; 5491 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5492 encmin = V_ipsec_esp_keymin; 5493 else 5494 encmin = _BITS(algo->minkey); 5495 5496 if (V_ipsec_esp_auth) 5497 m = key_getcomb_ah(); 5498 else { 5499 IPSEC_ASSERT(l <= MLEN, 5500 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5501 MGET(m, M_DONTWAIT, MT_DATA); 5502 if (m) { 5503 M_ALIGN(m, l); 5504 m->m_len = l; 5505 m->m_next = NULL; 5506 bzero(mtod(m, caddr_t), m->m_len); 5507 } 5508 } 5509 if (!m) 5510 goto fail; 5511 5512 totlen = 0; 5513 for (n = m; n; n = n->m_next) 5514 totlen += n->m_len; 5515 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5516 5517 for (off = 0; off < totlen; off += l) { 5518 n = m_pulldown(m, off, l, &o); 5519 if (!n) { 5520 /* m is already freed */ 5521 goto fail; 5522 } 5523 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5524 bzero(comb, sizeof(*comb)); 5525 key_getcomb_setlifetime(comb); 5526 comb->sadb_comb_encrypt = i; 5527 comb->sadb_comb_encrypt_minbits = encmin; 5528 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5529 } 5530 5531 if (!result) 5532 result = m; 5533 else 5534 m_cat(result, m); 5535 } 5536 5537 return result; 5538 5539 fail: 5540 if (result) 5541 m_freem(result); 5542 return NULL; 5543} 5544 5545static void 5546key_getsizes_ah( 5547 const struct auth_hash *ah, 5548 int alg, 5549 u_int16_t* min, 5550 u_int16_t* max) 5551{ 5552 INIT_VNET_IPSEC(curvnet); 5553 5554 *min = *max = ah->keysize; 5555 if (ah->keysize == 0) { 5556 /* 5557 * Transform takes arbitrary key size but algorithm 5558 * key size is restricted. Enforce this here. 5559 */ 5560 switch (alg) { 5561 case SADB_X_AALG_MD5: *min = *max = 16; break; 5562 case SADB_X_AALG_SHA: *min = *max = 20; break; 5563 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5564 default: 5565 DPRINTF(("%s: unknown AH algorithm %u\n", 5566 __func__, alg)); 5567 break; 5568 } 5569 } 5570} 5571 5572/* 5573 * XXX reorder combinations by preference 5574 */ 5575static struct mbuf * 5576key_getcomb_ah() 5577{ 5578 INIT_VNET_IPSEC(curvnet); 5579 struct sadb_comb *comb; 5580 struct auth_hash *algo; 5581 struct mbuf *m; 5582 u_int16_t minkeysize, maxkeysize; 5583 int i; 5584 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5585 5586 m = NULL; 5587 for (i = 1; i <= SADB_AALG_MAX; i++) { 5588#if 1 5589 /* we prefer HMAC algorithms, not old algorithms */ 5590 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5591 continue; 5592#endif 5593 algo = ah_algorithm_lookup(i); 5594 if (!algo) 5595 continue; 5596 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5597 /* discard algorithms with key size smaller than system min */ 5598 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5599 continue; 5600 5601 if (!m) { 5602 IPSEC_ASSERT(l <= MLEN, 5603 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5604 MGET(m, M_DONTWAIT, MT_DATA); 5605 if (m) { 5606 M_ALIGN(m, l); 5607 m->m_len = l; 5608 m->m_next = NULL; 5609 } 5610 } else 5611 M_PREPEND(m, l, M_DONTWAIT); 5612 if (!m) 5613 return NULL; 5614 5615 comb = mtod(m, struct sadb_comb *); 5616 bzero(comb, sizeof(*comb)); 5617 key_getcomb_setlifetime(comb); 5618 comb->sadb_comb_auth = i; 5619 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5620 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5621 } 5622 5623 return m; 5624} 5625 5626/* 5627 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5628 * XXX reorder combinations by preference 5629 */ 5630static struct mbuf * 5631key_getcomb_ipcomp() 5632{ 5633 struct sadb_comb *comb; 5634 struct comp_algo *algo; 5635 struct mbuf *m; 5636 int i; 5637 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5638 5639 m = NULL; 5640 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5641 algo = ipcomp_algorithm_lookup(i); 5642 if (!algo) 5643 continue; 5644 5645 if (!m) { 5646 IPSEC_ASSERT(l <= MLEN, 5647 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5648 MGET(m, M_DONTWAIT, MT_DATA); 5649 if (m) { 5650 M_ALIGN(m, l); 5651 m->m_len = l; 5652 m->m_next = NULL; 5653 } 5654 } else 5655 M_PREPEND(m, l, M_DONTWAIT); 5656 if (!m) 5657 return NULL; 5658 5659 comb = mtod(m, struct sadb_comb *); 5660 bzero(comb, sizeof(*comb)); 5661 key_getcomb_setlifetime(comb); 5662 comb->sadb_comb_encrypt = i; 5663 /* what should we set into sadb_comb_*_{min,max}bits? */ 5664 } 5665 5666 return m; 5667} 5668 5669/* 5670 * XXX no way to pass mode (transport/tunnel) to userland 5671 * XXX replay checking? 5672 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5673 */ 5674static struct mbuf * 5675key_getprop(saidx) 5676 const struct secasindex *saidx; 5677{ 5678 struct sadb_prop *prop; 5679 struct mbuf *m, *n; 5680 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5681 int totlen; 5682 5683 switch (saidx->proto) { 5684 case IPPROTO_ESP: 5685 m = key_getcomb_esp(); 5686 break; 5687 case IPPROTO_AH: 5688 m = key_getcomb_ah(); 5689 break; 5690 case IPPROTO_IPCOMP: 5691 m = key_getcomb_ipcomp(); 5692 break; 5693 default: 5694 return NULL; 5695 } 5696 5697 if (!m) 5698 return NULL; 5699 M_PREPEND(m, l, M_DONTWAIT); 5700 if (!m) 5701 return NULL; 5702 5703 totlen = 0; 5704 for (n = m; n; n = n->m_next) 5705 totlen += n->m_len; 5706 5707 prop = mtod(m, struct sadb_prop *); 5708 bzero(prop, sizeof(*prop)); 5709 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5710 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5711 prop->sadb_prop_replay = 32; /* XXX */ 5712 5713 return m; 5714} 5715 5716/* 5717 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5718 * send 5719 * <base, SA, address(SD), (address(P)), x_policy, 5720 * (identity(SD),) (sensitivity,) proposal> 5721 * to KMD, and expect to receive 5722 * <base> with SADB_ACQUIRE if error occured, 5723 * or 5724 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5725 * from KMD by PF_KEY. 5726 * 5727 * XXX x_policy is outside of RFC2367 (KAME extension). 5728 * XXX sensitivity is not supported. 5729 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5730 * see comment for key_getcomb_ipcomp(). 5731 * 5732 * OUT: 5733 * 0 : succeed 5734 * others: error number 5735 */ 5736static int 5737key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5738{ 5739 INIT_VNET_IPSEC(curvnet); 5740 struct mbuf *result = NULL, *m; 5741 struct secacq *newacq; 5742 u_int8_t satype; 5743 int error = -1; 5744 u_int32_t seq; 5745 5746 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5747 satype = key_proto2satype(saidx->proto); 5748 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5749 5750 /* 5751 * We never do anything about acquirng SA. There is anather 5752 * solution that kernel blocks to send SADB_ACQUIRE message until 5753 * getting something message from IKEd. In later case, to be 5754 * managed with ACQUIRING list. 5755 */ 5756 /* Get an entry to check whether sending message or not. */ 5757 if ((newacq = key_getacq(saidx)) != NULL) { 5758 if (V_key_blockacq_count < newacq->count) { 5759 /* reset counter and do send message. */ 5760 newacq->count = 0; 5761 } else { 5762 /* increment counter and do nothing. */ 5763 newacq->count++; 5764 return 0; 5765 } 5766 } else { 5767 /* make new entry for blocking to send SADB_ACQUIRE. */ 5768 if ((newacq = key_newacq(saidx)) == NULL) 5769 return ENOBUFS; 5770 } 5771 5772 5773 seq = newacq->seq; 5774 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5775 if (!m) { 5776 error = ENOBUFS; 5777 goto fail; 5778 } 5779 result = m; 5780 5781 /* set sadb_address for saidx's. */ 5782 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5783 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5784 if (!m) { 5785 error = ENOBUFS; 5786 goto fail; 5787 } 5788 m_cat(result, m); 5789 5790 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5791 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5792 if (!m) { 5793 error = ENOBUFS; 5794 goto fail; 5795 } 5796 m_cat(result, m); 5797 5798 /* XXX proxy address (optional) */ 5799 5800 /* set sadb_x_policy */ 5801 if (sp) { 5802 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5803 if (!m) { 5804 error = ENOBUFS; 5805 goto fail; 5806 } 5807 m_cat(result, m); 5808 } 5809 5810 /* XXX identity (optional) */ 5811#if 0 5812 if (idexttype && fqdn) { 5813 /* create identity extension (FQDN) */ 5814 struct sadb_ident *id; 5815 int fqdnlen; 5816 5817 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5818 id = (struct sadb_ident *)p; 5819 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5820 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5821 id->sadb_ident_exttype = idexttype; 5822 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5823 bcopy(fqdn, id + 1, fqdnlen); 5824 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5825 } 5826 5827 if (idexttype) { 5828 /* create identity extension (USERFQDN) */ 5829 struct sadb_ident *id; 5830 int userfqdnlen; 5831 5832 if (userfqdn) { 5833 /* +1 for terminating-NUL */ 5834 userfqdnlen = strlen(userfqdn) + 1; 5835 } else 5836 userfqdnlen = 0; 5837 id = (struct sadb_ident *)p; 5838 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5839 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5840 id->sadb_ident_exttype = idexttype; 5841 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5842 /* XXX is it correct? */ 5843 if (curproc && curproc->p_cred) 5844 id->sadb_ident_id = curproc->p_cred->p_ruid; 5845 if (userfqdn && userfqdnlen) 5846 bcopy(userfqdn, id + 1, userfqdnlen); 5847 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5848 } 5849#endif 5850 5851 /* XXX sensitivity (optional) */ 5852 5853 /* create proposal/combination extension */ 5854 m = key_getprop(saidx); 5855#if 0 5856 /* 5857 * spec conformant: always attach proposal/combination extension, 5858 * the problem is that we have no way to attach it for ipcomp, 5859 * due to the way sadb_comb is declared in RFC2367. 5860 */ 5861 if (!m) { 5862 error = ENOBUFS; 5863 goto fail; 5864 } 5865 m_cat(result, m); 5866#else 5867 /* 5868 * outside of spec; make proposal/combination extension optional. 5869 */ 5870 if (m) 5871 m_cat(result, m); 5872#endif 5873 5874 if ((result->m_flags & M_PKTHDR) == 0) { 5875 error = EINVAL; 5876 goto fail; 5877 } 5878 5879 if (result->m_len < sizeof(struct sadb_msg)) { 5880 result = m_pullup(result, sizeof(struct sadb_msg)); 5881 if (result == NULL) { 5882 error = ENOBUFS; 5883 goto fail; 5884 } 5885 } 5886 5887 result->m_pkthdr.len = 0; 5888 for (m = result; m; m = m->m_next) 5889 result->m_pkthdr.len += m->m_len; 5890 5891 mtod(result, struct sadb_msg *)->sadb_msg_len = 5892 PFKEY_UNIT64(result->m_pkthdr.len); 5893 5894 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5895 5896 fail: 5897 if (result) 5898 m_freem(result); 5899 return error; 5900} 5901 5902static struct secacq * 5903key_newacq(const struct secasindex *saidx) 5904{ 5905 INIT_VNET_IPSEC(curvnet); 5906 struct secacq *newacq; 5907 5908 /* get new entry */ 5909 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5910 if (newacq == NULL) { 5911 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5912 return NULL; 5913 } 5914 5915 /* copy secindex */ 5916 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5917 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5918 newacq->created = time_second; 5919 newacq->count = 0; 5920 5921 /* add to acqtree */ 5922 ACQ_LOCK(); 5923 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5924 ACQ_UNLOCK(); 5925 5926 return newacq; 5927} 5928 5929static struct secacq * 5930key_getacq(const struct secasindex *saidx) 5931{ 5932 INIT_VNET_IPSEC(curvnet); 5933 struct secacq *acq; 5934 5935 ACQ_LOCK(); 5936 LIST_FOREACH(acq, &V_acqtree, chain) { 5937 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5938 break; 5939 } 5940 ACQ_UNLOCK(); 5941 5942 return acq; 5943} 5944 5945static struct secacq * 5946key_getacqbyseq(seq) 5947 u_int32_t seq; 5948{ 5949 INIT_VNET_IPSEC(curvnet); 5950 struct secacq *acq; 5951 5952 ACQ_LOCK(); 5953 LIST_FOREACH(acq, &V_acqtree, chain) { 5954 if (acq->seq == seq) 5955 break; 5956 } 5957 ACQ_UNLOCK(); 5958 5959 return acq; 5960} 5961 5962static struct secspacq * 5963key_newspacq(spidx) 5964 struct secpolicyindex *spidx; 5965{ 5966 INIT_VNET_IPSEC(curvnet); 5967 struct secspacq *acq; 5968 5969 /* get new entry */ 5970 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5971 if (acq == NULL) { 5972 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5973 return NULL; 5974 } 5975 5976 /* copy secindex */ 5977 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5978 acq->created = time_second; 5979 acq->count = 0; 5980 5981 /* add to spacqtree */ 5982 SPACQ_LOCK(); 5983 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5984 SPACQ_UNLOCK(); 5985 5986 return acq; 5987} 5988 5989static struct secspacq * 5990key_getspacq(spidx) 5991 struct secpolicyindex *spidx; 5992{ 5993 INIT_VNET_IPSEC(curvnet); 5994 struct secspacq *acq; 5995 5996 SPACQ_LOCK(); 5997 LIST_FOREACH(acq, &V_spacqtree, chain) { 5998 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5999 /* NB: return holding spacq_lock */ 6000 return acq; 6001 } 6002 } 6003 SPACQ_UNLOCK(); 6004 6005 return NULL; 6006} 6007 6008/* 6009 * SADB_ACQUIRE processing, 6010 * in first situation, is receiving 6011 * <base> 6012 * from the ikmpd, and clear sequence of its secasvar entry. 6013 * 6014 * In second situation, is receiving 6015 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6016 * from a user land process, and return 6017 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6018 * to the socket. 6019 * 6020 * m will always be freed. 6021 */ 6022static int 6023key_acquire2(so, m, mhp) 6024 struct socket *so; 6025 struct mbuf *m; 6026 const struct sadb_msghdr *mhp; 6027{ 6028 INIT_VNET_IPSEC(curvnet); 6029 const struct sadb_address *src0, *dst0; 6030 struct secasindex saidx; 6031 struct secashead *sah; 6032 u_int16_t proto; 6033 int error; 6034 6035 IPSEC_ASSERT(so != NULL, ("null socket")); 6036 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6037 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6038 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6039 6040 /* 6041 * Error message from KMd. 6042 * We assume that if error was occured in IKEd, the length of PFKEY 6043 * message is equal to the size of sadb_msg structure. 6044 * We do not raise error even if error occured in this function. 6045 */ 6046 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6047 struct secacq *acq; 6048 6049 /* check sequence number */ 6050 if (mhp->msg->sadb_msg_seq == 0) { 6051 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6052 "number.\n", __func__)); 6053 m_freem(m); 6054 return 0; 6055 } 6056 6057 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6058 /* 6059 * the specified larval SA is already gone, or we got 6060 * a bogus sequence number. we can silently ignore it. 6061 */ 6062 m_freem(m); 6063 return 0; 6064 } 6065 6066 /* reset acq counter in order to deletion by timehander. */ 6067 acq->created = time_second; 6068 acq->count = 0; 6069 m_freem(m); 6070 return 0; 6071 } 6072 6073 /* 6074 * This message is from user land. 6075 */ 6076 6077 /* map satype to proto */ 6078 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6079 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6080 __func__)); 6081 return key_senderror(so, m, EINVAL); 6082 } 6083 6084 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6085 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6086 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6087 /* error */ 6088 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6089 __func__)); 6090 return key_senderror(so, m, EINVAL); 6091 } 6092 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6093 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6094 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6095 /* error */ 6096 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6097 __func__)); 6098 return key_senderror(so, m, EINVAL); 6099 } 6100 6101 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6102 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6103 6104 /* XXX boundary check against sa_len */ 6105 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6106 6107 /* get a SA index */ 6108 SAHTREE_LOCK(); 6109 LIST_FOREACH(sah, &V_sahtree, chain) { 6110 if (sah->state == SADB_SASTATE_DEAD) 6111 continue; 6112 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6113 break; 6114 } 6115 SAHTREE_UNLOCK(); 6116 if (sah != NULL) { 6117 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6118 return key_senderror(so, m, EEXIST); 6119 } 6120 6121 error = key_acquire(&saidx, NULL); 6122 if (error != 0) { 6123 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6124 __func__, mhp->msg->sadb_msg_errno)); 6125 return key_senderror(so, m, error); 6126 } 6127 6128 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6129} 6130 6131/* 6132 * SADB_REGISTER processing. 6133 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6134 * receive 6135 * <base> 6136 * from the ikmpd, and register a socket to send PF_KEY messages, 6137 * and send 6138 * <base, supported> 6139 * to KMD by PF_KEY. 6140 * If socket is detached, must free from regnode. 6141 * 6142 * m will always be freed. 6143 */ 6144static int 6145key_register(so, m, mhp) 6146 struct socket *so; 6147 struct mbuf *m; 6148 const struct sadb_msghdr *mhp; 6149{ 6150 INIT_VNET_IPSEC(curvnet); 6151 struct secreg *reg, *newreg = 0; 6152 6153 IPSEC_ASSERT(so != NULL, ("null socket")); 6154 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6155 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6156 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6157 6158 /* check for invalid register message */ 6159 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6160 return key_senderror(so, m, EINVAL); 6161 6162 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6163 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6164 goto setmsg; 6165 6166 /* check whether existing or not */ 6167 REGTREE_LOCK(); 6168 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6169 if (reg->so == so) { 6170 REGTREE_UNLOCK(); 6171 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6172 __func__)); 6173 return key_senderror(so, m, EEXIST); 6174 } 6175 } 6176 6177 /* create regnode */ 6178 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6179 if (newreg == NULL) { 6180 REGTREE_UNLOCK(); 6181 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6182 return key_senderror(so, m, ENOBUFS); 6183 } 6184 6185 newreg->so = so; 6186 ((struct keycb *)sotorawcb(so))->kp_registered++; 6187 6188 /* add regnode to regtree. */ 6189 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6190 REGTREE_UNLOCK(); 6191 6192 setmsg: 6193 { 6194 struct mbuf *n; 6195 struct sadb_msg *newmsg; 6196 struct sadb_supported *sup; 6197 u_int len, alen, elen; 6198 int off; 6199 int i; 6200 struct sadb_alg *alg; 6201 6202 /* create new sadb_msg to reply. */ 6203 alen = 0; 6204 for (i = 1; i <= SADB_AALG_MAX; i++) { 6205 if (ah_algorithm_lookup(i)) 6206 alen += sizeof(struct sadb_alg); 6207 } 6208 if (alen) 6209 alen += sizeof(struct sadb_supported); 6210 elen = 0; 6211 for (i = 1; i <= SADB_EALG_MAX; i++) { 6212 if (esp_algorithm_lookup(i)) 6213 elen += sizeof(struct sadb_alg); 6214 } 6215 if (elen) 6216 elen += sizeof(struct sadb_supported); 6217 6218 len = sizeof(struct sadb_msg) + alen + elen; 6219 6220 if (len > MCLBYTES) 6221 return key_senderror(so, m, ENOBUFS); 6222 6223 MGETHDR(n, M_DONTWAIT, MT_DATA); 6224 if (len > MHLEN) { 6225 MCLGET(n, M_DONTWAIT); 6226 if ((n->m_flags & M_EXT) == 0) { 6227 m_freem(n); 6228 n = NULL; 6229 } 6230 } 6231 if (!n) 6232 return key_senderror(so, m, ENOBUFS); 6233 6234 n->m_pkthdr.len = n->m_len = len; 6235 n->m_next = NULL; 6236 off = 0; 6237 6238 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6239 newmsg = mtod(n, struct sadb_msg *); 6240 newmsg->sadb_msg_errno = 0; 6241 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6242 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6243 6244 /* for authentication algorithm */ 6245 if (alen) { 6246 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6247 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6248 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6249 off += PFKEY_ALIGN8(sizeof(*sup)); 6250 6251 for (i = 1; i <= SADB_AALG_MAX; i++) { 6252 struct auth_hash *aalgo; 6253 u_int16_t minkeysize, maxkeysize; 6254 6255 aalgo = ah_algorithm_lookup(i); 6256 if (!aalgo) 6257 continue; 6258 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6259 alg->sadb_alg_id = i; 6260 alg->sadb_alg_ivlen = 0; 6261 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6262 alg->sadb_alg_minbits = _BITS(minkeysize); 6263 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6264 off += PFKEY_ALIGN8(sizeof(*alg)); 6265 } 6266 } 6267 6268 /* for encryption algorithm */ 6269 if (elen) { 6270 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6271 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6272 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6273 off += PFKEY_ALIGN8(sizeof(*sup)); 6274 6275 for (i = 1; i <= SADB_EALG_MAX; i++) { 6276 struct enc_xform *ealgo; 6277 6278 ealgo = esp_algorithm_lookup(i); 6279 if (!ealgo) 6280 continue; 6281 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6282 alg->sadb_alg_id = i; 6283 alg->sadb_alg_ivlen = ealgo->blocksize; 6284 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6285 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6286 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6287 } 6288 } 6289 6290 IPSEC_ASSERT(off == len, 6291 ("length assumption failed (off %u len %u)", off, len)); 6292 6293 m_freem(m); 6294 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6295 } 6296} 6297 6298/* 6299 * free secreg entry registered. 6300 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6301 */ 6302void 6303key_freereg(struct socket *so) 6304{ 6305 INIT_VNET_IPSEC(curvnet); 6306 struct secreg *reg; 6307 int i; 6308 6309 IPSEC_ASSERT(so != NULL, ("NULL so")); 6310 6311 /* 6312 * check whether existing or not. 6313 * check all type of SA, because there is a potential that 6314 * one socket is registered to multiple type of SA. 6315 */ 6316 REGTREE_LOCK(); 6317 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6318 LIST_FOREACH(reg, &V_regtree[i], chain) { 6319 if (reg->so == so && __LIST_CHAINED(reg)) { 6320 LIST_REMOVE(reg, chain); 6321 free(reg, M_IPSEC_SAR); 6322 break; 6323 } 6324 } 6325 } 6326 REGTREE_UNLOCK(); 6327} 6328 6329/* 6330 * SADB_EXPIRE processing 6331 * send 6332 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6333 * to KMD by PF_KEY. 6334 * NOTE: We send only soft lifetime extension. 6335 * 6336 * OUT: 0 : succeed 6337 * others : error number 6338 */ 6339static int 6340key_expire(struct secasvar *sav) 6341{ 6342 int s; 6343 int satype; 6344 struct mbuf *result = NULL, *m; 6345 int len; 6346 int error = -1; 6347 struct sadb_lifetime *lt; 6348 6349 /* XXX: Why do we lock ? */ 6350 s = splnet(); /*called from softclock()*/ 6351 6352 IPSEC_ASSERT (sav != NULL, ("null sav")); 6353 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6354 6355 /* set msg header */ 6356 satype = key_proto2satype(sav->sah->saidx.proto); 6357 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6358 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6359 if (!m) { 6360 error = ENOBUFS; 6361 goto fail; 6362 } 6363 result = m; 6364 6365 /* create SA extension */ 6366 m = key_setsadbsa(sav); 6367 if (!m) { 6368 error = ENOBUFS; 6369 goto fail; 6370 } 6371 m_cat(result, m); 6372 6373 /* create SA extension */ 6374 m = key_setsadbxsa2(sav->sah->saidx.mode, 6375 sav->replay ? sav->replay->count : 0, 6376 sav->sah->saidx.reqid); 6377 if (!m) { 6378 error = ENOBUFS; 6379 goto fail; 6380 } 6381 m_cat(result, m); 6382 6383 /* create lifetime extension (current and soft) */ 6384 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6385 m = key_alloc_mbuf(len); 6386 if (!m || m->m_next) { /*XXX*/ 6387 if (m) 6388 m_freem(m); 6389 error = ENOBUFS; 6390 goto fail; 6391 } 6392 bzero(mtod(m, caddr_t), len); 6393 lt = mtod(m, struct sadb_lifetime *); 6394 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6395 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6396 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6397 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6398 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6399 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6400 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6401 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6402 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6403 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6404 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6405 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6406 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6407 m_cat(result, m); 6408 6409 /* set sadb_address for source */ 6410 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6411 &sav->sah->saidx.src.sa, 6412 FULLMASK, IPSEC_ULPROTO_ANY); 6413 if (!m) { 6414 error = ENOBUFS; 6415 goto fail; 6416 } 6417 m_cat(result, m); 6418 6419 /* set sadb_address for destination */ 6420 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6421 &sav->sah->saidx.dst.sa, 6422 FULLMASK, IPSEC_ULPROTO_ANY); 6423 if (!m) { 6424 error = ENOBUFS; 6425 goto fail; 6426 } 6427 m_cat(result, m); 6428 6429 if ((result->m_flags & M_PKTHDR) == 0) { 6430 error = EINVAL; 6431 goto fail; 6432 } 6433 6434 if (result->m_len < sizeof(struct sadb_msg)) { 6435 result = m_pullup(result, sizeof(struct sadb_msg)); 6436 if (result == NULL) { 6437 error = ENOBUFS; 6438 goto fail; 6439 } 6440 } 6441 6442 result->m_pkthdr.len = 0; 6443 for (m = result; m; m = m->m_next) 6444 result->m_pkthdr.len += m->m_len; 6445 6446 mtod(result, struct sadb_msg *)->sadb_msg_len = 6447 PFKEY_UNIT64(result->m_pkthdr.len); 6448 6449 splx(s); 6450 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6451 6452 fail: 6453 if (result) 6454 m_freem(result); 6455 splx(s); 6456 return error; 6457} 6458 6459/* 6460 * SADB_FLUSH processing 6461 * receive 6462 * <base> 6463 * from the ikmpd, and free all entries in secastree. 6464 * and send, 6465 * <base> 6466 * to the ikmpd. 6467 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6468 * 6469 * m will always be freed. 6470 */ 6471static int 6472key_flush(so, m, mhp) 6473 struct socket *so; 6474 struct mbuf *m; 6475 const struct sadb_msghdr *mhp; 6476{ 6477 INIT_VNET_IPSEC(curvnet); 6478 struct sadb_msg *newmsg; 6479 struct secashead *sah, *nextsah; 6480 struct secasvar *sav, *nextsav; 6481 u_int16_t proto; 6482 u_int8_t state; 6483 u_int stateidx; 6484 6485 IPSEC_ASSERT(so != NULL, ("null socket")); 6486 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6487 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6488 6489 /* map satype to proto */ 6490 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6491 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6492 __func__)); 6493 return key_senderror(so, m, EINVAL); 6494 } 6495 6496 /* no SATYPE specified, i.e. flushing all SA. */ 6497 SAHTREE_LOCK(); 6498 for (sah = LIST_FIRST(&V_sahtree); 6499 sah != NULL; 6500 sah = nextsah) { 6501 nextsah = LIST_NEXT(sah, chain); 6502 6503 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6504 && proto != sah->saidx.proto) 6505 continue; 6506 6507 for (stateidx = 0; 6508 stateidx < _ARRAYLEN(saorder_state_alive); 6509 stateidx++) { 6510 state = saorder_state_any[stateidx]; 6511 for (sav = LIST_FIRST(&sah->savtree[state]); 6512 sav != NULL; 6513 sav = nextsav) { 6514 6515 nextsav = LIST_NEXT(sav, chain); 6516 6517 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6518 KEY_FREESAV(&sav); 6519 } 6520 } 6521 6522 sah->state = SADB_SASTATE_DEAD; 6523 } 6524 SAHTREE_UNLOCK(); 6525 6526 if (m->m_len < sizeof(struct sadb_msg) || 6527 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6528 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6529 return key_senderror(so, m, ENOBUFS); 6530 } 6531 6532 if (m->m_next) 6533 m_freem(m->m_next); 6534 m->m_next = NULL; 6535 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6536 newmsg = mtod(m, struct sadb_msg *); 6537 newmsg->sadb_msg_errno = 0; 6538 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6539 6540 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6541} 6542 6543/* 6544 * SADB_DUMP processing 6545 * dump all entries including status of DEAD in SAD. 6546 * receive 6547 * <base> 6548 * from the ikmpd, and dump all secasvar leaves 6549 * and send, 6550 * <base> ..... 6551 * to the ikmpd. 6552 * 6553 * m will always be freed. 6554 */ 6555static int 6556key_dump(so, m, mhp) 6557 struct socket *so; 6558 struct mbuf *m; 6559 const struct sadb_msghdr *mhp; 6560{ 6561 INIT_VNET_IPSEC(curvnet); 6562 struct secashead *sah; 6563 struct secasvar *sav; 6564 u_int16_t proto; 6565 u_int stateidx; 6566 u_int8_t satype; 6567 u_int8_t state; 6568 int cnt; 6569 struct sadb_msg *newmsg; 6570 struct mbuf *n; 6571 6572 IPSEC_ASSERT(so != NULL, ("null socket")); 6573 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6574 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6575 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6576 6577 /* map satype to proto */ 6578 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6579 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6580 __func__)); 6581 return key_senderror(so, m, EINVAL); 6582 } 6583 6584 /* count sav entries to be sent to the userland. */ 6585 cnt = 0; 6586 SAHTREE_LOCK(); 6587 LIST_FOREACH(sah, &V_sahtree, chain) { 6588 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6589 && proto != sah->saidx.proto) 6590 continue; 6591 6592 for (stateidx = 0; 6593 stateidx < _ARRAYLEN(saorder_state_any); 6594 stateidx++) { 6595 state = saorder_state_any[stateidx]; 6596 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6597 cnt++; 6598 } 6599 } 6600 } 6601 6602 if (cnt == 0) { 6603 SAHTREE_UNLOCK(); 6604 return key_senderror(so, m, ENOENT); 6605 } 6606 6607 /* send this to the userland, one at a time. */ 6608 newmsg = NULL; 6609 LIST_FOREACH(sah, &V_sahtree, chain) { 6610 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6611 && proto != sah->saidx.proto) 6612 continue; 6613 6614 /* map proto to satype */ 6615 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6616 SAHTREE_UNLOCK(); 6617 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6618 "SAD.\n", __func__)); 6619 return key_senderror(so, m, EINVAL); 6620 } 6621 6622 for (stateidx = 0; 6623 stateidx < _ARRAYLEN(saorder_state_any); 6624 stateidx++) { 6625 state = saorder_state_any[stateidx]; 6626 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6627 n = key_setdumpsa(sav, SADB_DUMP, satype, 6628 --cnt, mhp->msg->sadb_msg_pid); 6629 if (!n) { 6630 SAHTREE_UNLOCK(); 6631 return key_senderror(so, m, ENOBUFS); 6632 } 6633 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6634 } 6635 } 6636 } 6637 SAHTREE_UNLOCK(); 6638 6639 m_freem(m); 6640 return 0; 6641} 6642 6643/* 6644 * SADB_X_PROMISC processing 6645 * 6646 * m will always be freed. 6647 */ 6648static int 6649key_promisc(so, m, mhp) 6650 struct socket *so; 6651 struct mbuf *m; 6652 const struct sadb_msghdr *mhp; 6653{ 6654 int olen; 6655 6656 IPSEC_ASSERT(so != NULL, ("null socket")); 6657 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6658 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6659 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6660 6661 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6662 6663 if (olen < sizeof(struct sadb_msg)) { 6664#if 1 6665 return key_senderror(so, m, EINVAL); 6666#else 6667 m_freem(m); 6668 return 0; 6669#endif 6670 } else if (olen == sizeof(struct sadb_msg)) { 6671 /* enable/disable promisc mode */ 6672 struct keycb *kp; 6673 6674 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6675 return key_senderror(so, m, EINVAL); 6676 mhp->msg->sadb_msg_errno = 0; 6677 switch (mhp->msg->sadb_msg_satype) { 6678 case 0: 6679 case 1: 6680 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6681 break; 6682 default: 6683 return key_senderror(so, m, EINVAL); 6684 } 6685 6686 /* send the original message back to everyone */ 6687 mhp->msg->sadb_msg_errno = 0; 6688 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6689 } else { 6690 /* send packet as is */ 6691 6692 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6693 6694 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6695 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6696 } 6697} 6698 6699static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6700 const struct sadb_msghdr *)) = { 6701 NULL, /* SADB_RESERVED */ 6702 key_getspi, /* SADB_GETSPI */ 6703 key_update, /* SADB_UPDATE */ 6704 key_add, /* SADB_ADD */ 6705 key_delete, /* SADB_DELETE */ 6706 key_get, /* SADB_GET */ 6707 key_acquire2, /* SADB_ACQUIRE */ 6708 key_register, /* SADB_REGISTER */ 6709 NULL, /* SADB_EXPIRE */ 6710 key_flush, /* SADB_FLUSH */ 6711 key_dump, /* SADB_DUMP */ 6712 key_promisc, /* SADB_X_PROMISC */ 6713 NULL, /* SADB_X_PCHANGE */ 6714 key_spdadd, /* SADB_X_SPDUPDATE */ 6715 key_spdadd, /* SADB_X_SPDADD */ 6716 key_spddelete, /* SADB_X_SPDDELETE */ 6717 key_spdget, /* SADB_X_SPDGET */ 6718 NULL, /* SADB_X_SPDACQUIRE */ 6719 key_spddump, /* SADB_X_SPDDUMP */ 6720 key_spdflush, /* SADB_X_SPDFLUSH */ 6721 key_spdadd, /* SADB_X_SPDSETIDX */ 6722 NULL, /* SADB_X_SPDEXPIRE */ 6723 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6724}; 6725 6726/* 6727 * parse sadb_msg buffer to process PFKEYv2, 6728 * and create a data to response if needed. 6729 * I think to be dealed with mbuf directly. 6730 * IN: 6731 * msgp : pointer to pointer to a received buffer pulluped. 6732 * This is rewrited to response. 6733 * so : pointer to socket. 6734 * OUT: 6735 * length for buffer to send to user process. 6736 */ 6737int 6738key_parse(m, so) 6739 struct mbuf *m; 6740 struct socket *so; 6741{ 6742 INIT_VNET_IPSEC(curvnet); 6743 struct sadb_msg *msg; 6744 struct sadb_msghdr mh; 6745 u_int orglen; 6746 int error; 6747 int target; 6748 6749 IPSEC_ASSERT(so != NULL, ("null socket")); 6750 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6751 6752#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6753 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6754 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6755 kdebug_sadb(msg)); 6756#endif 6757 6758 if (m->m_len < sizeof(struct sadb_msg)) { 6759 m = m_pullup(m, sizeof(struct sadb_msg)); 6760 if (!m) 6761 return ENOBUFS; 6762 } 6763 msg = mtod(m, struct sadb_msg *); 6764 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6765 target = KEY_SENDUP_ONE; 6766 6767 if ((m->m_flags & M_PKTHDR) == 0 || 6768 m->m_pkthdr.len != m->m_pkthdr.len) { 6769 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6770 V_pfkeystat.out_invlen++; 6771 error = EINVAL; 6772 goto senderror; 6773 } 6774 6775 if (msg->sadb_msg_version != PF_KEY_V2) { 6776 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6777 __func__, msg->sadb_msg_version)); 6778 V_pfkeystat.out_invver++; 6779 error = EINVAL; 6780 goto senderror; 6781 } 6782 6783 if (msg->sadb_msg_type > SADB_MAX) { 6784 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6785 __func__, msg->sadb_msg_type)); 6786 V_pfkeystat.out_invmsgtype++; 6787 error = EINVAL; 6788 goto senderror; 6789 } 6790 6791 /* for old-fashioned code - should be nuked */ 6792 if (m->m_pkthdr.len > MCLBYTES) { 6793 m_freem(m); 6794 return ENOBUFS; 6795 } 6796 if (m->m_next) { 6797 struct mbuf *n; 6798 6799 MGETHDR(n, M_DONTWAIT, MT_DATA); 6800 if (n && m->m_pkthdr.len > MHLEN) { 6801 MCLGET(n, M_DONTWAIT); 6802 if ((n->m_flags & M_EXT) == 0) { 6803 m_free(n); 6804 n = NULL; 6805 } 6806 } 6807 if (!n) { 6808 m_freem(m); 6809 return ENOBUFS; 6810 } 6811 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6812 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6813 n->m_next = NULL; 6814 m_freem(m); 6815 m = n; 6816 } 6817 6818 /* align the mbuf chain so that extensions are in contiguous region. */ 6819 error = key_align(m, &mh); 6820 if (error) 6821 return error; 6822 6823 msg = mh.msg; 6824 6825 /* check SA type */ 6826 switch (msg->sadb_msg_satype) { 6827 case SADB_SATYPE_UNSPEC: 6828 switch (msg->sadb_msg_type) { 6829 case SADB_GETSPI: 6830 case SADB_UPDATE: 6831 case SADB_ADD: 6832 case SADB_DELETE: 6833 case SADB_GET: 6834 case SADB_ACQUIRE: 6835 case SADB_EXPIRE: 6836 ipseclog((LOG_DEBUG, "%s: must specify satype " 6837 "when msg type=%u.\n", __func__, 6838 msg->sadb_msg_type)); 6839 V_pfkeystat.out_invsatype++; 6840 error = EINVAL; 6841 goto senderror; 6842 } 6843 break; 6844 case SADB_SATYPE_AH: 6845 case SADB_SATYPE_ESP: 6846 case SADB_X_SATYPE_IPCOMP: 6847 case SADB_X_SATYPE_TCPSIGNATURE: 6848 switch (msg->sadb_msg_type) { 6849 case SADB_X_SPDADD: 6850 case SADB_X_SPDDELETE: 6851 case SADB_X_SPDGET: 6852 case SADB_X_SPDDUMP: 6853 case SADB_X_SPDFLUSH: 6854 case SADB_X_SPDSETIDX: 6855 case SADB_X_SPDUPDATE: 6856 case SADB_X_SPDDELETE2: 6857 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6858 __func__, msg->sadb_msg_type)); 6859 V_pfkeystat.out_invsatype++; 6860 error = EINVAL; 6861 goto senderror; 6862 } 6863 break; 6864 case SADB_SATYPE_RSVP: 6865 case SADB_SATYPE_OSPFV2: 6866 case SADB_SATYPE_RIPV2: 6867 case SADB_SATYPE_MIP: 6868 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6869 __func__, msg->sadb_msg_satype)); 6870 V_pfkeystat.out_invsatype++; 6871 error = EOPNOTSUPP; 6872 goto senderror; 6873 case 1: /* XXX: What does it do? */ 6874 if (msg->sadb_msg_type == SADB_X_PROMISC) 6875 break; 6876 /*FALLTHROUGH*/ 6877 default: 6878 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6879 __func__, msg->sadb_msg_satype)); 6880 V_pfkeystat.out_invsatype++; 6881 error = EINVAL; 6882 goto senderror; 6883 } 6884 6885 /* check field of upper layer protocol and address family */ 6886 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6887 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6888 struct sadb_address *src0, *dst0; 6889 u_int plen; 6890 6891 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6892 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6893 6894 /* check upper layer protocol */ 6895 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6896 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6897 "mismatched.\n", __func__)); 6898 V_pfkeystat.out_invaddr++; 6899 error = EINVAL; 6900 goto senderror; 6901 } 6902 6903 /* check family */ 6904 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6905 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6906 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6907 __func__)); 6908 V_pfkeystat.out_invaddr++; 6909 error = EINVAL; 6910 goto senderror; 6911 } 6912 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6913 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6914 ipseclog((LOG_DEBUG, "%s: address struct size " 6915 "mismatched.\n", __func__)); 6916 V_pfkeystat.out_invaddr++; 6917 error = EINVAL; 6918 goto senderror; 6919 } 6920 6921 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6922 case AF_INET: 6923 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6924 sizeof(struct sockaddr_in)) { 6925 V_pfkeystat.out_invaddr++; 6926 error = EINVAL; 6927 goto senderror; 6928 } 6929 break; 6930 case AF_INET6: 6931 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6932 sizeof(struct sockaddr_in6)) { 6933 V_pfkeystat.out_invaddr++; 6934 error = EINVAL; 6935 goto senderror; 6936 } 6937 break; 6938 default: 6939 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6940 __func__)); 6941 V_pfkeystat.out_invaddr++; 6942 error = EAFNOSUPPORT; 6943 goto senderror; 6944 } 6945 6946 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6947 case AF_INET: 6948 plen = sizeof(struct in_addr) << 3; 6949 break; 6950 case AF_INET6: 6951 plen = sizeof(struct in6_addr) << 3; 6952 break; 6953 default: 6954 plen = 0; /*fool gcc*/ 6955 break; 6956 } 6957 6958 /* check max prefix length */ 6959 if (src0->sadb_address_prefixlen > plen || 6960 dst0->sadb_address_prefixlen > plen) { 6961 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6962 __func__)); 6963 V_pfkeystat.out_invaddr++; 6964 error = EINVAL; 6965 goto senderror; 6966 } 6967 6968 /* 6969 * prefixlen == 0 is valid because there can be a case when 6970 * all addresses are matched. 6971 */ 6972 } 6973 6974 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6975 key_typesw[msg->sadb_msg_type] == NULL) { 6976 V_pfkeystat.out_invmsgtype++; 6977 error = EINVAL; 6978 goto senderror; 6979 } 6980 6981 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6982 6983senderror: 6984 msg->sadb_msg_errno = error; 6985 return key_sendup_mbuf(so, m, target); 6986} 6987 6988static int 6989key_senderror(so, m, code) 6990 struct socket *so; 6991 struct mbuf *m; 6992 int code; 6993{ 6994 struct sadb_msg *msg; 6995 6996 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6997 ("mbuf too small, len %u", m->m_len)); 6998 6999 msg = mtod(m, struct sadb_msg *); 7000 msg->sadb_msg_errno = code; 7001 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7002} 7003 7004/* 7005 * set the pointer to each header into message buffer. 7006 * m will be freed on error. 7007 * XXX larger-than-MCLBYTES extension? 7008 */ 7009static int 7010key_align(m, mhp) 7011 struct mbuf *m; 7012 struct sadb_msghdr *mhp; 7013{ 7014 INIT_VNET_IPSEC(curvnet); 7015 struct mbuf *n; 7016 struct sadb_ext *ext; 7017 size_t off, end; 7018 int extlen; 7019 int toff; 7020 7021 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7022 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7023 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7024 ("mbuf too small, len %u", m->m_len)); 7025 7026 /* initialize */ 7027 bzero(mhp, sizeof(*mhp)); 7028 7029 mhp->msg = mtod(m, struct sadb_msg *); 7030 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7031 7032 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7033 extlen = end; /*just in case extlen is not updated*/ 7034 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7035 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7036 if (!n) { 7037 /* m is already freed */ 7038 return ENOBUFS; 7039 } 7040 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7041 7042 /* set pointer */ 7043 switch (ext->sadb_ext_type) { 7044 case SADB_EXT_SA: 7045 case SADB_EXT_ADDRESS_SRC: 7046 case SADB_EXT_ADDRESS_DST: 7047 case SADB_EXT_ADDRESS_PROXY: 7048 case SADB_EXT_LIFETIME_CURRENT: 7049 case SADB_EXT_LIFETIME_HARD: 7050 case SADB_EXT_LIFETIME_SOFT: 7051 case SADB_EXT_KEY_AUTH: 7052 case SADB_EXT_KEY_ENCRYPT: 7053 case SADB_EXT_IDENTITY_SRC: 7054 case SADB_EXT_IDENTITY_DST: 7055 case SADB_EXT_SENSITIVITY: 7056 case SADB_EXT_PROPOSAL: 7057 case SADB_EXT_SUPPORTED_AUTH: 7058 case SADB_EXT_SUPPORTED_ENCRYPT: 7059 case SADB_EXT_SPIRANGE: 7060 case SADB_X_EXT_POLICY: 7061 case SADB_X_EXT_SA2: 7062 /* duplicate check */ 7063 /* 7064 * XXX Are there duplication payloads of either 7065 * KEY_AUTH or KEY_ENCRYPT ? 7066 */ 7067 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7068 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7069 "%u\n", __func__, ext->sadb_ext_type)); 7070 m_freem(m); 7071 V_pfkeystat.out_dupext++; 7072 return EINVAL; 7073 } 7074 break; 7075 default: 7076 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7077 __func__, ext->sadb_ext_type)); 7078 m_freem(m); 7079 V_pfkeystat.out_invexttype++; 7080 return EINVAL; 7081 } 7082 7083 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7084 7085 if (key_validate_ext(ext, extlen)) { 7086 m_freem(m); 7087 V_pfkeystat.out_invlen++; 7088 return EINVAL; 7089 } 7090 7091 n = m_pulldown(m, off, extlen, &toff); 7092 if (!n) { 7093 /* m is already freed */ 7094 return ENOBUFS; 7095 } 7096 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7097 7098 mhp->ext[ext->sadb_ext_type] = ext; 7099 mhp->extoff[ext->sadb_ext_type] = off; 7100 mhp->extlen[ext->sadb_ext_type] = extlen; 7101 } 7102 7103 if (off != end) { 7104 m_freem(m); 7105 V_pfkeystat.out_invlen++; 7106 return EINVAL; 7107 } 7108 7109 return 0; 7110} 7111 7112static int 7113key_validate_ext(ext, len) 7114 const struct sadb_ext *ext; 7115 int len; 7116{ 7117 const struct sockaddr *sa; 7118 enum { NONE, ADDR } checktype = NONE; 7119 int baselen = 0; 7120 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7121 7122 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7123 return EINVAL; 7124 7125 /* if it does not match minimum/maximum length, bail */ 7126 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7127 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7128 return EINVAL; 7129 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7130 return EINVAL; 7131 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7132 return EINVAL; 7133 7134 /* more checks based on sadb_ext_type XXX need more */ 7135 switch (ext->sadb_ext_type) { 7136 case SADB_EXT_ADDRESS_SRC: 7137 case SADB_EXT_ADDRESS_DST: 7138 case SADB_EXT_ADDRESS_PROXY: 7139 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7140 checktype = ADDR; 7141 break; 7142 case SADB_EXT_IDENTITY_SRC: 7143 case SADB_EXT_IDENTITY_DST: 7144 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7145 SADB_X_IDENTTYPE_ADDR) { 7146 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7147 checktype = ADDR; 7148 } else 7149 checktype = NONE; 7150 break; 7151 default: 7152 checktype = NONE; 7153 break; 7154 } 7155 7156 switch (checktype) { 7157 case NONE: 7158 break; 7159 case ADDR: 7160 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7161 if (len < baselen + sal) 7162 return EINVAL; 7163 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7164 return EINVAL; 7165 break; 7166 } 7167 7168 return 0; 7169} 7170 7171void 7172key_init(void) 7173{ 7174 INIT_VNET_IPSEC(curvnet); 7175 int i; 7176 7177 V_key_debug_level = 0; 7178 V_key_spi_trycnt = 1000; 7179 V_key_spi_minval = 0x100; 7180 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7181 V_policy_id = 0; 7182 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7183 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7184 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7185 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7186 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7187 7188 V_acq_seq = 0; 7189 7190 V_ipsec_esp_keymin = 256; 7191 V_ipsec_esp_auth = 0; 7192 V_ipsec_ah_keymin = 128; 7193 7194 for (i = 0; i < IPSEC_DIR_MAX; i++) 7195 LIST_INIT(&V_sptree[i]); 7196 7197 LIST_INIT(&V_sahtree); 7198 7199 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7200 LIST_INIT(&V_regtree[i]); 7201 7202 LIST_INIT(&V_acqtree); 7203 LIST_INIT(&V_spacqtree); 7204 7205 /* system default */ 7206 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7207 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7208 7209 if (!IS_DEFAULT_VNET(curvnet)) 7210 return; 7211 7212 SPTREE_LOCK_INIT(); 7213 REGTREE_LOCK_INIT(); 7214 SAHTREE_LOCK_INIT(); 7215 ACQ_LOCK_INIT(); 7216 SPACQ_LOCK_INIT(); 7217 7218#ifndef IPSEC_DEBUG2 7219 timeout((void *)key_timehandler, (void *)0, hz); 7220#endif /*IPSEC_DEBUG2*/ 7221 7222 /* initialize key statistics */ 7223 keystat.getspi_count = 1; 7224 7225 printf("IPsec: Initialized Security Association Processing.\n"); 7226 7227 return; 7228} 7229 7230/* 7231 * XXX: maybe This function is called after INBOUND IPsec processing. 7232 * 7233 * Special check for tunnel-mode packets. 7234 * We must make some checks for consistency between inner and outer IP header. 7235 * 7236 * xxx more checks to be provided 7237 */ 7238int 7239key_checktunnelsanity(sav, family, src, dst) 7240 struct secasvar *sav; 7241 u_int family; 7242 caddr_t src; 7243 caddr_t dst; 7244{ 7245 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7246 7247 /* XXX: check inner IP header */ 7248 7249 return 1; 7250} 7251 7252/* record data transfer on SA, and update timestamps */ 7253void 7254key_sa_recordxfer(sav, m) 7255 struct secasvar *sav; 7256 struct mbuf *m; 7257{ 7258 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7259 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7260 if (!sav->lft_c) 7261 return; 7262 7263 /* 7264 * XXX Currently, there is a difference of bytes size 7265 * between inbound and outbound processing. 7266 */ 7267 sav->lft_c->bytes += m->m_pkthdr.len; 7268 /* to check bytes lifetime is done in key_timehandler(). */ 7269 7270 /* 7271 * We use the number of packets as the unit of 7272 * allocations. We increment the variable 7273 * whenever {esp,ah}_{in,out}put is called. 7274 */ 7275 sav->lft_c->allocations++; 7276 /* XXX check for expires? */ 7277 7278 /* 7279 * NOTE: We record CURRENT usetime by using wall clock, 7280 * in seconds. HARD and SOFT lifetime are measured by the time 7281 * difference (again in seconds) from usetime. 7282 * 7283 * usetime 7284 * v expire expire 7285 * -----+-----+--------+---> t 7286 * <--------------> HARD 7287 * <-----> SOFT 7288 */ 7289 sav->lft_c->usetime = time_second; 7290 /* XXX check for expires? */ 7291 7292 return; 7293} 7294 7295/* dumb version */ 7296void 7297key_sa_routechange(dst) 7298 struct sockaddr *dst; 7299{ 7300 INIT_VNET_IPSEC(curvnet); 7301 struct secashead *sah; 7302 struct route *ro; 7303 7304 SAHTREE_LOCK(); 7305 LIST_FOREACH(sah, &V_sahtree, chain) { 7306 ro = &sah->sa_route; 7307 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7308 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7309 RTFREE(ro->ro_rt); 7310 ro->ro_rt = (struct rtentry *)NULL; 7311 } 7312 } 7313 SAHTREE_UNLOCK(); 7314} 7315 7316static void 7317key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7318{ 7319 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7320 SAHTREE_LOCK_ASSERT(); 7321 7322 if (sav->state != state) { 7323 if (__LIST_CHAINED(sav)) 7324 LIST_REMOVE(sav, chain); 7325 sav->state = state; 7326 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7327 } 7328} 7329 7330void 7331key_sa_stir_iv(sav) 7332 struct secasvar *sav; 7333{ 7334 7335 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7336 key_randomfill(sav->iv, sav->ivlen); 7337} 7338 7339/* XXX too much? */ 7340static struct mbuf * 7341key_alloc_mbuf(l) 7342 int l; 7343{ 7344 struct mbuf *m = NULL, *n; 7345 int len, t; 7346 7347 len = l; 7348 while (len > 0) { 7349 MGET(n, M_DONTWAIT, MT_DATA); 7350 if (n && len > MLEN) 7351 MCLGET(n, M_DONTWAIT); 7352 if (!n) { 7353 m_freem(m); 7354 return NULL; 7355 } 7356 7357 n->m_next = NULL; 7358 n->m_len = 0; 7359 n->m_len = M_TRAILINGSPACE(n); 7360 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7361 if (n->m_len > len) { 7362 t = (n->m_len - len) & ~(sizeof(long) - 1); 7363 n->m_data += t; 7364 n->m_len = len; 7365 } 7366 7367 len -= n->m_len; 7368 7369 if (m) 7370 m_cat(m, n); 7371 else 7372 m = n; 7373 } 7374 7375 return m; 7376} 7377 7378/* 7379 * Take one of the kernel's security keys and convert it into a PF_KEY 7380 * structure within an mbuf, suitable for sending up to a waiting 7381 * application in user land. 7382 * 7383 * IN: 7384 * src: A pointer to a kernel security key. 7385 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7386 * OUT: 7387 * a valid mbuf or NULL indicating an error 7388 * 7389 */ 7390 7391static struct mbuf * 7392key_setkey(struct seckey *src, u_int16_t exttype) 7393{ 7394 struct mbuf *m; 7395 struct sadb_key *p; 7396 int len; 7397 7398 if (src == NULL) 7399 return NULL; 7400 7401 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7402 m = key_alloc_mbuf(len); 7403 if (m == NULL) 7404 return NULL; 7405 p = mtod(m, struct sadb_key *); 7406 bzero(p, len); 7407 p->sadb_key_len = PFKEY_UNIT64(len); 7408 p->sadb_key_exttype = exttype; 7409 p->sadb_key_bits = src->bits; 7410 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7411 7412 return m; 7413} 7414 7415/* 7416 * Take one of the kernel's lifetime data structures and convert it 7417 * into a PF_KEY structure within an mbuf, suitable for sending up to 7418 * a waiting application in user land. 7419 * 7420 * IN: 7421 * src: A pointer to a kernel lifetime structure. 7422 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7423 * data structures for more information. 7424 * OUT: 7425 * a valid mbuf or NULL indicating an error 7426 * 7427 */ 7428 7429static struct mbuf * 7430key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7431{ 7432 struct mbuf *m = NULL; 7433 struct sadb_lifetime *p; 7434 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7435 7436 if (src == NULL) 7437 return NULL; 7438 7439 m = key_alloc_mbuf(len); 7440 if (m == NULL) 7441 return m; 7442 p = mtod(m, struct sadb_lifetime *); 7443 7444 bzero(p, len); 7445 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7446 p->sadb_lifetime_exttype = exttype; 7447 p->sadb_lifetime_allocations = src->allocations; 7448 p->sadb_lifetime_bytes = src->bytes; 7449 p->sadb_lifetime_addtime = src->addtime; 7450 p->sadb_lifetime_usetime = src->usetime; 7451 7452 return m; 7453 7454} 7455