key.c revision 189962
1/* $FreeBSD: head/sys/netipsec/key.c 189962 2009-03-18 14:01:41Z 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/* 688 * return a policy that matches this particular inbound packet. 689 * XXX slow 690 */ 691struct secpolicy * 692key_gettunnel(const struct sockaddr *osrc, 693 const struct sockaddr *odst, 694 const struct sockaddr *isrc, 695 const struct sockaddr *idst, 696 const char* where, int tag) 697{ 698 INIT_VNET_IPSEC(curvnet); 699 struct secpolicy *sp; 700 const int dir = IPSEC_DIR_INBOUND; 701 struct ipsecrequest *r1, *r2, *p; 702 struct secpolicyindex spidx; 703 704 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 705 printf("DP %s from %s:%u\n", __func__, where, tag)); 706 707 if (isrc->sa_family != idst->sa_family) { 708 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 709 __func__, isrc->sa_family, idst->sa_family)); 710 sp = NULL; 711 goto done; 712 } 713 714 SPTREE_LOCK(); 715 LIST_FOREACH(sp, &V_sptree[dir], chain) { 716 if (sp->state == IPSEC_SPSTATE_DEAD) 717 continue; 718 719 r1 = r2 = NULL; 720 for (p = sp->req; p; p = p->next) { 721 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 722 continue; 723 724 r1 = r2; 725 r2 = p; 726 727 if (!r1) { 728 /* here we look at address matches only */ 729 spidx = sp->spidx; 730 if (isrc->sa_len > sizeof(spidx.src) || 731 idst->sa_len > sizeof(spidx.dst)) 732 continue; 733 bcopy(isrc, &spidx.src, isrc->sa_len); 734 bcopy(idst, &spidx.dst, idst->sa_len); 735 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 736 continue; 737 } else { 738 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 739 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 740 continue; 741 } 742 743 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 744 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 745 continue; 746 747 goto found; 748 } 749 } 750 sp = NULL; 751found: 752 if (sp) { 753 sp->lastused = time_second; 754 SP_ADDREF(sp); 755 } 756 SPTREE_UNLOCK(); 757done: 758 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 759 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 760 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 761 return sp; 762} 763 764/* 765 * allocating an SA entry for an *OUTBOUND* packet. 766 * checking each request entries in SP, and acquire an SA if need. 767 * OUT: 0: there are valid requests. 768 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 769 */ 770int 771key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 772{ 773 INIT_VNET_IPSEC(curvnet); 774 u_int level; 775 int error; 776 777 IPSEC_ASSERT(isr != NULL, ("null isr")); 778 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 779 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 780 saidx->mode == IPSEC_MODE_TUNNEL, 781 ("unexpected policy %u", saidx->mode)); 782 783 /* 784 * XXX guard against protocol callbacks from the crypto 785 * thread as they reference ipsecrequest.sav which we 786 * temporarily null out below. Need to rethink how we 787 * handle bundled SA's in the callback thread. 788 */ 789 IPSECREQUEST_LOCK_ASSERT(isr); 790 791 /* get current level */ 792 level = ipsec_get_reqlevel(isr); 793#if 0 794 /* 795 * We do allocate new SA only if the state of SA in the holder is 796 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 797 */ 798 if (isr->sav != NULL) { 799 if (isr->sav->sah == NULL) 800 panic("%s: sah is null.\n", __func__); 801 if (isr->sav == (struct secasvar *)LIST_FIRST( 802 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 803 KEY_FREESAV(&isr->sav); 804 isr->sav = NULL; 805 } 806 } 807#else 808 /* 809 * we free any SA stashed in the IPsec request because a different 810 * SA may be involved each time this request is checked, either 811 * because new SAs are being configured, or this request is 812 * associated with an unconnected datagram socket, or this request 813 * is associated with a system default policy. 814 * 815 * The operation may have negative impact to performance. We may 816 * want to check cached SA carefully, rather than picking new SA 817 * every time. 818 */ 819 if (isr->sav != NULL) { 820 KEY_FREESAV(&isr->sav); 821 isr->sav = NULL; 822 } 823#endif 824 825 /* 826 * new SA allocation if no SA found. 827 * key_allocsa_policy should allocate the oldest SA available. 828 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 829 */ 830 if (isr->sav == NULL) 831 isr->sav = key_allocsa_policy(saidx); 832 833 /* When there is SA. */ 834 if (isr->sav != NULL) { 835 if (isr->sav->state != SADB_SASTATE_MATURE && 836 isr->sav->state != SADB_SASTATE_DYING) 837 return EINVAL; 838 return 0; 839 } 840 841 /* there is no SA */ 842 error = key_acquire(saidx, isr->sp); 843 if (error != 0) { 844 /* XXX What should I do ? */ 845 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 846 __func__, error)); 847 return error; 848 } 849 850 if (level != IPSEC_LEVEL_REQUIRE) { 851 /* XXX sigh, the interface to this routine is botched */ 852 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 853 return 0; 854 } else { 855 return ENOENT; 856 } 857} 858 859/* 860 * allocating a SA for policy entry from SAD. 861 * NOTE: searching SAD of aliving state. 862 * OUT: NULL: not found. 863 * others: found and return the pointer. 864 */ 865static struct secasvar * 866key_allocsa_policy(const struct secasindex *saidx) 867{ 868#define N(a) _ARRAYLEN(a) 869 INIT_VNET_IPSEC(curvnet); 870 struct secashead *sah; 871 struct secasvar *sav; 872 u_int stateidx, arraysize; 873 const u_int *state_valid; 874 875 SAHTREE_LOCK(); 876 LIST_FOREACH(sah, &V_sahtree, chain) { 877 if (sah->state == SADB_SASTATE_DEAD) 878 continue; 879 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 880 if (V_key_preferred_oldsa) { 881 state_valid = saorder_state_valid_prefer_old; 882 arraysize = N(saorder_state_valid_prefer_old); 883 } else { 884 state_valid = saorder_state_valid_prefer_new; 885 arraysize = N(saorder_state_valid_prefer_new); 886 } 887 SAHTREE_UNLOCK(); 888 goto found; 889 } 890 } 891 SAHTREE_UNLOCK(); 892 893 return NULL; 894 895 found: 896 /* search valid state */ 897 for (stateidx = 0; stateidx < arraysize; stateidx++) { 898 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 899 if (sav != NULL) 900 return sav; 901 } 902 903 return NULL; 904#undef N 905} 906 907/* 908 * searching SAD with direction, protocol, mode and state. 909 * called by key_allocsa_policy(). 910 * OUT: 911 * NULL : not found 912 * others : found, pointer to a SA. 913 */ 914static struct secasvar * 915key_do_allocsa_policy(struct secashead *sah, u_int state) 916{ 917 INIT_VNET_IPSEC(curvnet); 918 struct secasvar *sav, *nextsav, *candidate, *d; 919 920 /* initilize */ 921 candidate = NULL; 922 923 SAHTREE_LOCK(); 924 for (sav = LIST_FIRST(&sah->savtree[state]); 925 sav != NULL; 926 sav = nextsav) { 927 928 nextsav = LIST_NEXT(sav, chain); 929 930 /* sanity check */ 931 KEY_CHKSASTATE(sav->state, state, __func__); 932 933 /* initialize */ 934 if (candidate == NULL) { 935 candidate = sav; 936 continue; 937 } 938 939 /* Which SA is the better ? */ 940 941 IPSEC_ASSERT(candidate->lft_c != NULL, 942 ("null candidate lifetime")); 943 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 944 945 /* What the best method is to compare ? */ 946 if (V_key_preferred_oldsa) { 947 if (candidate->lft_c->addtime > 948 sav->lft_c->addtime) { 949 candidate = sav; 950 } 951 continue; 952 /*NOTREACHED*/ 953 } 954 955 /* preferred new sa rather than old sa */ 956 if (candidate->lft_c->addtime < 957 sav->lft_c->addtime) { 958 d = candidate; 959 candidate = sav; 960 } else 961 d = sav; 962 963 /* 964 * prepared to delete the SA when there is more 965 * suitable candidate and the lifetime of the SA is not 966 * permanent. 967 */ 968 if (d->lft_h->addtime != 0) { 969 struct mbuf *m, *result; 970 u_int8_t satype; 971 972 key_sa_chgstate(d, SADB_SASTATE_DEAD); 973 974 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 975 976 satype = key_proto2satype(d->sah->saidx.proto); 977 if (satype == 0) 978 goto msgfail; 979 980 m = key_setsadbmsg(SADB_DELETE, 0, 981 satype, 0, 0, d->refcnt - 1); 982 if (!m) 983 goto msgfail; 984 result = m; 985 986 /* set sadb_address for saidx's. */ 987 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 988 &d->sah->saidx.src.sa, 989 d->sah->saidx.src.sa.sa_len << 3, 990 IPSEC_ULPROTO_ANY); 991 if (!m) 992 goto msgfail; 993 m_cat(result, m); 994 995 /* set sadb_address for saidx's. */ 996 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 997 &d->sah->saidx.dst.sa, 998 d->sah->saidx.dst.sa.sa_len << 3, 999 IPSEC_ULPROTO_ANY); 1000 if (!m) 1001 goto msgfail; 1002 m_cat(result, m); 1003 1004 /* create SA extension */ 1005 m = key_setsadbsa(d); 1006 if (!m) 1007 goto msgfail; 1008 m_cat(result, m); 1009 1010 if (result->m_len < sizeof(struct sadb_msg)) { 1011 result = m_pullup(result, 1012 sizeof(struct sadb_msg)); 1013 if (result == NULL) 1014 goto msgfail; 1015 } 1016 1017 result->m_pkthdr.len = 0; 1018 for (m = result; m; m = m->m_next) 1019 result->m_pkthdr.len += m->m_len; 1020 mtod(result, struct sadb_msg *)->sadb_msg_len = 1021 PFKEY_UNIT64(result->m_pkthdr.len); 1022 1023 if (key_sendup_mbuf(NULL, result, 1024 KEY_SENDUP_REGISTERED)) 1025 goto msgfail; 1026 msgfail: 1027 KEY_FREESAV(&d); 1028 } 1029 } 1030 if (candidate) { 1031 sa_addref(candidate); 1032 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1033 printf("DP %s cause refcnt++:%d SA:%p\n", 1034 __func__, candidate->refcnt, candidate)); 1035 } 1036 SAHTREE_UNLOCK(); 1037 1038 return candidate; 1039} 1040 1041/* 1042 * allocating a usable SA entry for a *INBOUND* packet. 1043 * Must call key_freesav() later. 1044 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1045 * NULL: not found, or error occured. 1046 * 1047 * In the comparison, no source address is used--for RFC2401 conformance. 1048 * To quote, from section 4.1: 1049 * A security association is uniquely identified by a triple consisting 1050 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1051 * security protocol (AH or ESP) identifier. 1052 * Note that, however, we do need to keep source address in IPsec SA. 1053 * IKE specification and PF_KEY specification do assume that we 1054 * keep source address in IPsec SA. We see a tricky situation here. 1055 */ 1056struct secasvar * 1057key_allocsa( 1058 union sockaddr_union *dst, 1059 u_int proto, 1060 u_int32_t spi, 1061 const char* where, int tag) 1062{ 1063 INIT_VNET_IPSEC(curvnet); 1064 struct secashead *sah; 1065 struct secasvar *sav; 1066 u_int stateidx, arraysize, state; 1067 const u_int *saorder_state_valid; 1068 1069 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1070 1071 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1072 printf("DP %s from %s:%u\n", __func__, where, tag)); 1073 1074 /* 1075 * searching SAD. 1076 * XXX: to be checked internal IP header somewhere. Also when 1077 * IPsec tunnel packet is received. But ESP tunnel mode is 1078 * encrypted so we can't check internal IP header. 1079 */ 1080 SAHTREE_LOCK(); 1081 if (V_key_preferred_oldsa) { 1082 saorder_state_valid = saorder_state_valid_prefer_old; 1083 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1084 } else { 1085 saorder_state_valid = saorder_state_valid_prefer_new; 1086 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1087 } 1088 LIST_FOREACH(sah, &V_sahtree, chain) { 1089 /* search valid state */ 1090 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1091 state = saorder_state_valid[stateidx]; 1092 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1093 /* sanity check */ 1094 KEY_CHKSASTATE(sav->state, state, __func__); 1095 /* do not return entries w/ unusable state */ 1096 if (sav->state != SADB_SASTATE_MATURE && 1097 sav->state != SADB_SASTATE_DYING) 1098 continue; 1099 if (proto != sav->sah->saidx.proto) 1100 continue; 1101 if (spi != sav->spi) 1102 continue; 1103#if 0 /* don't check src */ 1104 /* check src address */ 1105 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1106 continue; 1107#endif 1108 /* check dst address */ 1109 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1110 continue; 1111 sa_addref(sav); 1112 goto done; 1113 } 1114 } 1115 } 1116 sav = NULL; 1117done: 1118 SAHTREE_UNLOCK(); 1119 1120 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1121 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1122 sav, sav ? sav->refcnt : 0)); 1123 return sav; 1124} 1125 1126/* 1127 * Must be called after calling key_allocsp(). 1128 * For both the packet without socket and key_freeso(). 1129 */ 1130void 1131_key_freesp(struct secpolicy **spp, const char* where, int tag) 1132{ 1133 INIT_VNET_IPSEC(curvnet); 1134 struct secpolicy *sp = *spp; 1135 1136 IPSEC_ASSERT(sp != NULL, ("null sp")); 1137 1138 SPTREE_LOCK(); 1139 SP_DELREF(sp); 1140 1141 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1142 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1143 __func__, sp, sp->id, where, tag, sp->refcnt)); 1144 1145 if (sp->refcnt == 0) { 1146 *spp = NULL; 1147 key_delsp(sp); 1148 } 1149 SPTREE_UNLOCK(); 1150} 1151 1152/* 1153 * Must be called after calling key_allocsp(). 1154 * For the packet with socket. 1155 */ 1156void 1157key_freeso(struct socket *so) 1158{ 1159 INIT_VNET_IPSEC(curvnet); 1160 IPSEC_ASSERT(so != NULL, ("null so")); 1161 1162 switch (so->so_proto->pr_domain->dom_family) { 1163#if defined(INET) || defined(INET6) 1164#ifdef INET 1165 case PF_INET: 1166#endif 1167#ifdef INET6 1168 case PF_INET6: 1169#endif 1170 { 1171 struct inpcb *pcb = sotoinpcb(so); 1172 1173 /* Does it have a PCB ? */ 1174 if (pcb == NULL) 1175 return; 1176 key_freesp_so(&pcb->inp_sp->sp_in); 1177 key_freesp_so(&pcb->inp_sp->sp_out); 1178 } 1179 break; 1180#endif /* INET || INET6 */ 1181 default: 1182 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1183 __func__, so->so_proto->pr_domain->dom_family)); 1184 return; 1185 } 1186} 1187 1188static void 1189key_freesp_so(struct secpolicy **sp) 1190{ 1191 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1192 1193 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1194 (*sp)->policy == IPSEC_POLICY_BYPASS) 1195 return; 1196 1197 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1198 ("invalid policy %u", (*sp)->policy)); 1199 KEY_FREESP(sp); 1200} 1201 1202/* 1203 * Must be called after calling key_allocsa(). 1204 * This function is called by key_freesp() to free some SA allocated 1205 * for a policy. 1206 */ 1207void 1208key_freesav(struct secasvar **psav, const char* where, int tag) 1209{ 1210 INIT_VNET_IPSEC(curvnet); 1211 struct secasvar *sav = *psav; 1212 1213 IPSEC_ASSERT(sav != NULL, ("null sav")); 1214 1215 if (sa_delref(sav)) { 1216 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1217 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1218 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1219 *psav = NULL; 1220 key_delsav(sav); 1221 } else { 1222 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1223 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1224 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1225 } 1226} 1227 1228/* %%% SPD management */ 1229/* 1230 * free security policy entry. 1231 */ 1232static void 1233key_delsp(struct secpolicy *sp) 1234{ 1235 struct ipsecrequest *isr, *nextisr; 1236 1237 IPSEC_ASSERT(sp != NULL, ("null sp")); 1238 SPTREE_LOCK_ASSERT(); 1239 1240 sp->state = IPSEC_SPSTATE_DEAD; 1241 1242 IPSEC_ASSERT(sp->refcnt == 0, 1243 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1244 1245 /* remove from SP index */ 1246 if (__LIST_CHAINED(sp)) 1247 LIST_REMOVE(sp, chain); 1248 1249 for (isr = sp->req; isr != NULL; isr = nextisr) { 1250 if (isr->sav != NULL) { 1251 KEY_FREESAV(&isr->sav); 1252 isr->sav = NULL; 1253 } 1254 1255 nextisr = isr->next; 1256 ipsec_delisr(isr); 1257 } 1258 _key_delsp(sp); 1259} 1260 1261/* 1262 * search SPD 1263 * OUT: NULL : not found 1264 * others : found, pointer to a SP. 1265 */ 1266static struct secpolicy * 1267key_getsp(struct secpolicyindex *spidx) 1268{ 1269 INIT_VNET_IPSEC(curvnet); 1270 struct secpolicy *sp; 1271 1272 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1273 1274 SPTREE_LOCK(); 1275 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1276 if (sp->state == IPSEC_SPSTATE_DEAD) 1277 continue; 1278 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1279 SP_ADDREF(sp); 1280 break; 1281 } 1282 } 1283 SPTREE_UNLOCK(); 1284 1285 return sp; 1286} 1287 1288/* 1289 * get SP by index. 1290 * OUT: NULL : not found 1291 * others : found, pointer to a SP. 1292 */ 1293static struct secpolicy * 1294key_getspbyid(u_int32_t id) 1295{ 1296 INIT_VNET_IPSEC(curvnet); 1297 struct secpolicy *sp; 1298 1299 SPTREE_LOCK(); 1300 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1301 if (sp->state == IPSEC_SPSTATE_DEAD) 1302 continue; 1303 if (sp->id == id) { 1304 SP_ADDREF(sp); 1305 goto done; 1306 } 1307 } 1308 1309 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1310 if (sp->state == IPSEC_SPSTATE_DEAD) 1311 continue; 1312 if (sp->id == id) { 1313 SP_ADDREF(sp); 1314 goto done; 1315 } 1316 } 1317done: 1318 SPTREE_UNLOCK(); 1319 1320 return sp; 1321} 1322 1323struct secpolicy * 1324key_newsp(const char* where, int tag) 1325{ 1326 INIT_VNET_IPSEC(curvnet); 1327 struct secpolicy *newsp = NULL; 1328 1329 newsp = (struct secpolicy *) 1330 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1331 if (newsp) { 1332 SECPOLICY_LOCK_INIT(newsp); 1333 newsp->refcnt = 1; 1334 newsp->req = NULL; 1335 } 1336 1337 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1338 printf("DP %s from %s:%u return SP:%p\n", __func__, 1339 where, tag, newsp)); 1340 return newsp; 1341} 1342 1343static void 1344_key_delsp(struct secpolicy *sp) 1345{ 1346 SECPOLICY_LOCK_DESTROY(sp); 1347 free(sp, M_IPSEC_SP); 1348} 1349 1350/* 1351 * create secpolicy structure from sadb_x_policy structure. 1352 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1353 * so must be set properly later. 1354 */ 1355struct secpolicy * 1356key_msg2sp(xpl0, len, error) 1357 struct sadb_x_policy *xpl0; 1358 size_t len; 1359 int *error; 1360{ 1361 INIT_VNET_IPSEC(curvnet); 1362 struct secpolicy *newsp; 1363 1364 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1365 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1366 1367 if (len != PFKEY_EXTLEN(xpl0)) { 1368 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1369 *error = EINVAL; 1370 return NULL; 1371 } 1372 1373 if ((newsp = KEY_NEWSP()) == NULL) { 1374 *error = ENOBUFS; 1375 return NULL; 1376 } 1377 1378 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1379 newsp->policy = xpl0->sadb_x_policy_type; 1380 1381 /* check policy */ 1382 switch (xpl0->sadb_x_policy_type) { 1383 case IPSEC_POLICY_DISCARD: 1384 case IPSEC_POLICY_NONE: 1385 case IPSEC_POLICY_ENTRUST: 1386 case IPSEC_POLICY_BYPASS: 1387 newsp->req = NULL; 1388 break; 1389 1390 case IPSEC_POLICY_IPSEC: 1391 { 1392 int tlen; 1393 struct sadb_x_ipsecrequest *xisr; 1394 struct ipsecrequest **p_isr = &newsp->req; 1395 1396 /* validity check */ 1397 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1398 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1399 __func__)); 1400 KEY_FREESP(&newsp); 1401 *error = EINVAL; 1402 return NULL; 1403 } 1404 1405 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1406 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1407 1408 while (tlen > 0) { 1409 /* length check */ 1410 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1411 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1412 "length.\n", __func__)); 1413 KEY_FREESP(&newsp); 1414 *error = EINVAL; 1415 return NULL; 1416 } 1417 1418 /* allocate request buffer */ 1419 /* NB: data structure is zero'd */ 1420 *p_isr = ipsec_newisr(); 1421 if ((*p_isr) == NULL) { 1422 ipseclog((LOG_DEBUG, 1423 "%s: No more memory.\n", __func__)); 1424 KEY_FREESP(&newsp); 1425 *error = ENOBUFS; 1426 return NULL; 1427 } 1428 1429 /* set values */ 1430 switch (xisr->sadb_x_ipsecrequest_proto) { 1431 case IPPROTO_ESP: 1432 case IPPROTO_AH: 1433 case IPPROTO_IPCOMP: 1434 break; 1435 default: 1436 ipseclog((LOG_DEBUG, 1437 "%s: invalid proto type=%u\n", __func__, 1438 xisr->sadb_x_ipsecrequest_proto)); 1439 KEY_FREESP(&newsp); 1440 *error = EPROTONOSUPPORT; 1441 return NULL; 1442 } 1443 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1444 1445 switch (xisr->sadb_x_ipsecrequest_mode) { 1446 case IPSEC_MODE_TRANSPORT: 1447 case IPSEC_MODE_TUNNEL: 1448 break; 1449 case IPSEC_MODE_ANY: 1450 default: 1451 ipseclog((LOG_DEBUG, 1452 "%s: invalid mode=%u\n", __func__, 1453 xisr->sadb_x_ipsecrequest_mode)); 1454 KEY_FREESP(&newsp); 1455 *error = EINVAL; 1456 return NULL; 1457 } 1458 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1459 1460 switch (xisr->sadb_x_ipsecrequest_level) { 1461 case IPSEC_LEVEL_DEFAULT: 1462 case IPSEC_LEVEL_USE: 1463 case IPSEC_LEVEL_REQUIRE: 1464 break; 1465 case IPSEC_LEVEL_UNIQUE: 1466 /* validity check */ 1467 /* 1468 * If range violation of reqid, kernel will 1469 * update it, don't refuse it. 1470 */ 1471 if (xisr->sadb_x_ipsecrequest_reqid 1472 > IPSEC_MANUAL_REQID_MAX) { 1473 ipseclog((LOG_DEBUG, 1474 "%s: reqid=%d range " 1475 "violation, updated by kernel.\n", 1476 __func__, 1477 xisr->sadb_x_ipsecrequest_reqid)); 1478 xisr->sadb_x_ipsecrequest_reqid = 0; 1479 } 1480 1481 /* allocate new reqid id if reqid is zero. */ 1482 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1483 u_int32_t reqid; 1484 if ((reqid = key_newreqid()) == 0) { 1485 KEY_FREESP(&newsp); 1486 *error = ENOBUFS; 1487 return NULL; 1488 } 1489 (*p_isr)->saidx.reqid = reqid; 1490 xisr->sadb_x_ipsecrequest_reqid = reqid; 1491 } else { 1492 /* set it for manual keying. */ 1493 (*p_isr)->saidx.reqid = 1494 xisr->sadb_x_ipsecrequest_reqid; 1495 } 1496 break; 1497 1498 default: 1499 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1500 __func__, 1501 xisr->sadb_x_ipsecrequest_level)); 1502 KEY_FREESP(&newsp); 1503 *error = EINVAL; 1504 return NULL; 1505 } 1506 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1507 1508 /* set IP addresses if there */ 1509 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1510 struct sockaddr *paddr; 1511 1512 paddr = (struct sockaddr *)(xisr + 1); 1513 1514 /* validity check */ 1515 if (paddr->sa_len 1516 > sizeof((*p_isr)->saidx.src)) { 1517 ipseclog((LOG_DEBUG, "%s: invalid " 1518 "request address length.\n", 1519 __func__)); 1520 KEY_FREESP(&newsp); 1521 *error = EINVAL; 1522 return NULL; 1523 } 1524 bcopy(paddr, &(*p_isr)->saidx.src, 1525 paddr->sa_len); 1526 1527 paddr = (struct sockaddr *)((caddr_t)paddr 1528 + paddr->sa_len); 1529 1530 /* validity check */ 1531 if (paddr->sa_len 1532 > sizeof((*p_isr)->saidx.dst)) { 1533 ipseclog((LOG_DEBUG, "%s: invalid " 1534 "request address length.\n", 1535 __func__)); 1536 KEY_FREESP(&newsp); 1537 *error = EINVAL; 1538 return NULL; 1539 } 1540 bcopy(paddr, &(*p_isr)->saidx.dst, 1541 paddr->sa_len); 1542 } 1543 1544 (*p_isr)->sp = newsp; 1545 1546 /* initialization for the next. */ 1547 p_isr = &(*p_isr)->next; 1548 tlen -= xisr->sadb_x_ipsecrequest_len; 1549 1550 /* validity check */ 1551 if (tlen < 0) { 1552 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1553 __func__)); 1554 KEY_FREESP(&newsp); 1555 *error = EINVAL; 1556 return NULL; 1557 } 1558 1559 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1560 + xisr->sadb_x_ipsecrequest_len); 1561 } 1562 } 1563 break; 1564 default: 1565 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1566 KEY_FREESP(&newsp); 1567 *error = EINVAL; 1568 return NULL; 1569 } 1570 1571 *error = 0; 1572 return newsp; 1573} 1574 1575static u_int32_t 1576key_newreqid() 1577{ 1578 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1579 1580 auto_reqid = (auto_reqid == ~0 1581 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1582 1583 /* XXX should be unique check */ 1584 1585 return auto_reqid; 1586} 1587 1588/* 1589 * copy secpolicy struct to sadb_x_policy structure indicated. 1590 */ 1591struct mbuf * 1592key_sp2msg(sp) 1593 struct secpolicy *sp; 1594{ 1595 struct sadb_x_policy *xpl; 1596 int tlen; 1597 caddr_t p; 1598 struct mbuf *m; 1599 1600 IPSEC_ASSERT(sp != NULL, ("null policy")); 1601 1602 tlen = key_getspreqmsglen(sp); 1603 1604 m = key_alloc_mbuf(tlen); 1605 if (!m || m->m_next) { /*XXX*/ 1606 if (m) 1607 m_freem(m); 1608 return NULL; 1609 } 1610 1611 m->m_len = tlen; 1612 m->m_next = NULL; 1613 xpl = mtod(m, struct sadb_x_policy *); 1614 bzero(xpl, tlen); 1615 1616 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1617 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1618 xpl->sadb_x_policy_type = sp->policy; 1619 xpl->sadb_x_policy_dir = sp->spidx.dir; 1620 xpl->sadb_x_policy_id = sp->id; 1621 p = (caddr_t)xpl + sizeof(*xpl); 1622 1623 /* if is the policy for ipsec ? */ 1624 if (sp->policy == IPSEC_POLICY_IPSEC) { 1625 struct sadb_x_ipsecrequest *xisr; 1626 struct ipsecrequest *isr; 1627 1628 for (isr = sp->req; isr != NULL; isr = isr->next) { 1629 1630 xisr = (struct sadb_x_ipsecrequest *)p; 1631 1632 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1633 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1634 xisr->sadb_x_ipsecrequest_level = isr->level; 1635 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1636 1637 p += sizeof(*xisr); 1638 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1639 p += isr->saidx.src.sa.sa_len; 1640 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1641 p += isr->saidx.src.sa.sa_len; 1642 1643 xisr->sadb_x_ipsecrequest_len = 1644 PFKEY_ALIGN8(sizeof(*xisr) 1645 + isr->saidx.src.sa.sa_len 1646 + isr->saidx.dst.sa.sa_len); 1647 } 1648 } 1649 1650 return m; 1651} 1652 1653/* m will not be freed nor modified */ 1654static struct mbuf * 1655#ifdef __STDC__ 1656key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1657 int ndeep, int nitem, ...) 1658#else 1659key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1660 struct mbuf *m; 1661 const struct sadb_msghdr *mhp; 1662 int ndeep; 1663 int nitem; 1664 va_dcl 1665#endif 1666{ 1667 va_list ap; 1668 int idx; 1669 int i; 1670 struct mbuf *result = NULL, *n; 1671 int len; 1672 1673 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1674 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1675 1676 va_start(ap, nitem); 1677 for (i = 0; i < nitem; i++) { 1678 idx = va_arg(ap, int); 1679 if (idx < 0 || idx > SADB_EXT_MAX) 1680 goto fail; 1681 /* don't attempt to pull empty extension */ 1682 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1683 continue; 1684 if (idx != SADB_EXT_RESERVED && 1685 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1686 continue; 1687 1688 if (idx == SADB_EXT_RESERVED) { 1689 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1690 1691 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1692 1693 MGETHDR(n, M_DONTWAIT, MT_DATA); 1694 if (!n) 1695 goto fail; 1696 n->m_len = len; 1697 n->m_next = NULL; 1698 m_copydata(m, 0, sizeof(struct sadb_msg), 1699 mtod(n, caddr_t)); 1700 } else if (i < ndeep) { 1701 len = mhp->extlen[idx]; 1702 n = key_alloc_mbuf(len); 1703 if (!n || n->m_next) { /*XXX*/ 1704 if (n) 1705 m_freem(n); 1706 goto fail; 1707 } 1708 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1709 mtod(n, caddr_t)); 1710 } else { 1711 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1712 M_DONTWAIT); 1713 } 1714 if (n == NULL) 1715 goto fail; 1716 1717 if (result) 1718 m_cat(result, n); 1719 else 1720 result = n; 1721 } 1722 va_end(ap); 1723 1724 if ((result->m_flags & M_PKTHDR) != 0) { 1725 result->m_pkthdr.len = 0; 1726 for (n = result; n; n = n->m_next) 1727 result->m_pkthdr.len += n->m_len; 1728 } 1729 1730 return result; 1731 1732fail: 1733 m_freem(result); 1734 return NULL; 1735} 1736 1737/* 1738 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1739 * add an entry to SP database, when received 1740 * <base, address(SD), (lifetime(H),) policy> 1741 * from the user(?). 1742 * Adding to SP database, 1743 * and send 1744 * <base, address(SD), (lifetime(H),) policy> 1745 * to the socket which was send. 1746 * 1747 * SPDADD set a unique policy entry. 1748 * SPDSETIDX like SPDADD without a part of policy requests. 1749 * SPDUPDATE replace a unique policy entry. 1750 * 1751 * m will always be freed. 1752 */ 1753static int 1754key_spdadd(so, m, mhp) 1755 struct socket *so; 1756 struct mbuf *m; 1757 const struct sadb_msghdr *mhp; 1758{ 1759 INIT_VNET_IPSEC(curvnet); 1760 struct sadb_address *src0, *dst0; 1761 struct sadb_x_policy *xpl0, *xpl; 1762 struct sadb_lifetime *lft = NULL; 1763 struct secpolicyindex spidx; 1764 struct secpolicy *newsp; 1765 int error; 1766 1767 IPSEC_ASSERT(so != NULL, ("null socket")); 1768 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1769 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1770 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1771 1772 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1773 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1774 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1775 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1776 return key_senderror(so, m, EINVAL); 1777 } 1778 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1779 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1780 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1781 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1782 __func__)); 1783 return key_senderror(so, m, EINVAL); 1784 } 1785 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1786 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1787 < sizeof(struct sadb_lifetime)) { 1788 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1789 __func__)); 1790 return key_senderror(so, m, EINVAL); 1791 } 1792 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1793 } 1794 1795 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1796 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1797 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1798 1799 /* make secindex */ 1800 /* XXX boundary check against sa_len */ 1801 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1802 src0 + 1, 1803 dst0 + 1, 1804 src0->sadb_address_prefixlen, 1805 dst0->sadb_address_prefixlen, 1806 src0->sadb_address_proto, 1807 &spidx); 1808 1809 /* checking the direciton. */ 1810 switch (xpl0->sadb_x_policy_dir) { 1811 case IPSEC_DIR_INBOUND: 1812 case IPSEC_DIR_OUTBOUND: 1813 break; 1814 default: 1815 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1816 mhp->msg->sadb_msg_errno = EINVAL; 1817 return 0; 1818 } 1819 1820 /* check policy */ 1821 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1822 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1823 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1824 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1825 return key_senderror(so, m, EINVAL); 1826 } 1827 1828 /* policy requests are mandatory when action is ipsec. */ 1829 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1830 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1831 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1832 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1833 __func__)); 1834 return key_senderror(so, m, EINVAL); 1835 } 1836 1837 /* 1838 * checking there is SP already or not. 1839 * SPDUPDATE doesn't depend on whether there is a SP or not. 1840 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1841 * then error. 1842 */ 1843 newsp = key_getsp(&spidx); 1844 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1845 if (newsp) { 1846 newsp->state = IPSEC_SPSTATE_DEAD; 1847 KEY_FREESP(&newsp); 1848 } 1849 } else { 1850 if (newsp != NULL) { 1851 KEY_FREESP(&newsp); 1852 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1853 __func__)); 1854 return key_senderror(so, m, EEXIST); 1855 } 1856 } 1857 1858 /* allocation new SP entry */ 1859 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1860 return key_senderror(so, m, error); 1861 } 1862 1863 if ((newsp->id = key_getnewspid()) == 0) { 1864 _key_delsp(newsp); 1865 return key_senderror(so, m, ENOBUFS); 1866 } 1867 1868 /* XXX boundary check against sa_len */ 1869 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1870 src0 + 1, 1871 dst0 + 1, 1872 src0->sadb_address_prefixlen, 1873 dst0->sadb_address_prefixlen, 1874 src0->sadb_address_proto, 1875 &newsp->spidx); 1876 1877 /* sanity check on addr pair */ 1878 if (((struct sockaddr *)(src0 + 1))->sa_family != 1879 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1880 _key_delsp(newsp); 1881 return key_senderror(so, m, EINVAL); 1882 } 1883 if (((struct sockaddr *)(src0 + 1))->sa_len != 1884 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1885 _key_delsp(newsp); 1886 return key_senderror(so, m, EINVAL); 1887 } 1888#if 1 1889 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1890 struct sockaddr *sa; 1891 sa = (struct sockaddr *)(src0 + 1); 1892 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1893 _key_delsp(newsp); 1894 return key_senderror(so, m, EINVAL); 1895 } 1896 } 1897 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1898 struct sockaddr *sa; 1899 sa = (struct sockaddr *)(dst0 + 1); 1900 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1901 _key_delsp(newsp); 1902 return key_senderror(so, m, EINVAL); 1903 } 1904 } 1905#endif 1906 1907 newsp->created = time_second; 1908 newsp->lastused = newsp->created; 1909 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1910 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1911 1912 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1913 newsp->state = IPSEC_SPSTATE_ALIVE; 1914 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1915 1916 /* delete the entry in spacqtree */ 1917 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1918 struct secspacq *spacq = key_getspacq(&spidx); 1919 if (spacq != NULL) { 1920 /* reset counter in order to deletion by timehandler. */ 1921 spacq->created = time_second; 1922 spacq->count = 0; 1923 SPACQ_UNLOCK(); 1924 } 1925 } 1926 1927 { 1928 struct mbuf *n, *mpolicy; 1929 struct sadb_msg *newmsg; 1930 int off; 1931 1932 /* create new sadb_msg to reply. */ 1933 if (lft) { 1934 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1935 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1936 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1937 } else { 1938 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1939 SADB_X_EXT_POLICY, 1940 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1941 } 1942 if (!n) 1943 return key_senderror(so, m, ENOBUFS); 1944 1945 if (n->m_len < sizeof(*newmsg)) { 1946 n = m_pullup(n, sizeof(*newmsg)); 1947 if (!n) 1948 return key_senderror(so, m, ENOBUFS); 1949 } 1950 newmsg = mtod(n, struct sadb_msg *); 1951 newmsg->sadb_msg_errno = 0; 1952 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1953 1954 off = 0; 1955 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1956 sizeof(*xpl), &off); 1957 if (mpolicy == NULL) { 1958 /* n is already freed */ 1959 return key_senderror(so, m, ENOBUFS); 1960 } 1961 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1962 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1963 m_freem(n); 1964 return key_senderror(so, m, EINVAL); 1965 } 1966 xpl->sadb_x_policy_id = newsp->id; 1967 1968 m_freem(m); 1969 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1970 } 1971} 1972 1973/* 1974 * get new policy id. 1975 * OUT: 1976 * 0: failure. 1977 * others: success. 1978 */ 1979static u_int32_t 1980key_getnewspid() 1981{ 1982 INIT_VNET_IPSEC(curvnet); 1983 u_int32_t newid = 0; 1984 int count = V_key_spi_trycnt; /* XXX */ 1985 struct secpolicy *sp; 1986 1987 /* when requesting to allocate spi ranged */ 1988 while (count--) { 1989 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1990 1991 if ((sp = key_getspbyid(newid)) == NULL) 1992 break; 1993 1994 KEY_FREESP(&sp); 1995 } 1996 1997 if (count == 0 || newid == 0) { 1998 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 1999 __func__)); 2000 return 0; 2001 } 2002 2003 return newid; 2004} 2005 2006/* 2007 * SADB_SPDDELETE processing 2008 * receive 2009 * <base, address(SD), policy(*)> 2010 * from the user(?), and set SADB_SASTATE_DEAD, 2011 * and send, 2012 * <base, address(SD), policy(*)> 2013 * to the ikmpd. 2014 * policy(*) including direction of policy. 2015 * 2016 * m will always be freed. 2017 */ 2018static int 2019key_spddelete(so, m, mhp) 2020 struct socket *so; 2021 struct mbuf *m; 2022 const struct sadb_msghdr *mhp; 2023{ 2024 INIT_VNET_IPSEC(curvnet); 2025 struct sadb_address *src0, *dst0; 2026 struct sadb_x_policy *xpl0; 2027 struct secpolicyindex spidx; 2028 struct secpolicy *sp; 2029 2030 IPSEC_ASSERT(so != NULL, ("null so")); 2031 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2032 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2033 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2034 2035 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2036 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2037 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2038 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2039 __func__)); 2040 return key_senderror(so, m, EINVAL); 2041 } 2042 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2043 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2044 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2045 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2046 __func__)); 2047 return key_senderror(so, m, EINVAL); 2048 } 2049 2050 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2051 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2052 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2053 2054 /* make secindex */ 2055 /* XXX boundary check against sa_len */ 2056 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2057 src0 + 1, 2058 dst0 + 1, 2059 src0->sadb_address_prefixlen, 2060 dst0->sadb_address_prefixlen, 2061 src0->sadb_address_proto, 2062 &spidx); 2063 2064 /* checking the direciton. */ 2065 switch (xpl0->sadb_x_policy_dir) { 2066 case IPSEC_DIR_INBOUND: 2067 case IPSEC_DIR_OUTBOUND: 2068 break; 2069 default: 2070 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2071 return key_senderror(so, m, EINVAL); 2072 } 2073 2074 /* Is there SP in SPD ? */ 2075 if ((sp = key_getsp(&spidx)) == NULL) { 2076 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2077 return key_senderror(so, m, EINVAL); 2078 } 2079 2080 /* save policy id to buffer to be returned. */ 2081 xpl0->sadb_x_policy_id = sp->id; 2082 2083 sp->state = IPSEC_SPSTATE_DEAD; 2084 KEY_FREESP(&sp); 2085 2086 { 2087 struct mbuf *n; 2088 struct sadb_msg *newmsg; 2089 2090 /* create new sadb_msg to reply. */ 2091 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2092 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2093 if (!n) 2094 return key_senderror(so, m, ENOBUFS); 2095 2096 newmsg = mtod(n, struct sadb_msg *); 2097 newmsg->sadb_msg_errno = 0; 2098 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2099 2100 m_freem(m); 2101 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2102 } 2103} 2104 2105/* 2106 * SADB_SPDDELETE2 processing 2107 * receive 2108 * <base, policy(*)> 2109 * from the user(?), and set SADB_SASTATE_DEAD, 2110 * and send, 2111 * <base, policy(*)> 2112 * to the ikmpd. 2113 * policy(*) including direction of policy. 2114 * 2115 * m will always be freed. 2116 */ 2117static int 2118key_spddelete2(so, m, mhp) 2119 struct socket *so; 2120 struct mbuf *m; 2121 const struct sadb_msghdr *mhp; 2122{ 2123 INIT_VNET_IPSEC(curvnet); 2124 u_int32_t id; 2125 struct secpolicy *sp; 2126 2127 IPSEC_ASSERT(so != NULL, ("null socket")); 2128 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2129 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2130 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2131 2132 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2133 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2134 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2135 return key_senderror(so, m, EINVAL); 2136 } 2137 2138 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2139 2140 /* Is there SP in SPD ? */ 2141 if ((sp = key_getspbyid(id)) == NULL) { 2142 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2143 return key_senderror(so, m, EINVAL); 2144 } 2145 2146 sp->state = IPSEC_SPSTATE_DEAD; 2147 KEY_FREESP(&sp); 2148 2149 { 2150 struct mbuf *n, *nn; 2151 struct sadb_msg *newmsg; 2152 int off, len; 2153 2154 /* create new sadb_msg to reply. */ 2155 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2156 2157 MGETHDR(n, M_DONTWAIT, MT_DATA); 2158 if (n && len > MHLEN) { 2159 MCLGET(n, M_DONTWAIT); 2160 if ((n->m_flags & M_EXT) == 0) { 2161 m_freem(n); 2162 n = NULL; 2163 } 2164 } 2165 if (!n) 2166 return key_senderror(so, m, ENOBUFS); 2167 2168 n->m_len = len; 2169 n->m_next = NULL; 2170 off = 0; 2171 2172 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2173 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2174 2175 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2176 off, len)); 2177 2178 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2179 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2180 if (!n->m_next) { 2181 m_freem(n); 2182 return key_senderror(so, m, ENOBUFS); 2183 } 2184 2185 n->m_pkthdr.len = 0; 2186 for (nn = n; nn; nn = nn->m_next) 2187 n->m_pkthdr.len += nn->m_len; 2188 2189 newmsg = mtod(n, struct sadb_msg *); 2190 newmsg->sadb_msg_errno = 0; 2191 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2192 2193 m_freem(m); 2194 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2195 } 2196} 2197 2198/* 2199 * SADB_X_GET processing 2200 * receive 2201 * <base, policy(*)> 2202 * from the user(?), 2203 * and send, 2204 * <base, address(SD), policy> 2205 * to the ikmpd. 2206 * policy(*) including direction of policy. 2207 * 2208 * m will always be freed. 2209 */ 2210static int 2211key_spdget(so, m, mhp) 2212 struct socket *so; 2213 struct mbuf *m; 2214 const struct sadb_msghdr *mhp; 2215{ 2216 INIT_VNET_IPSEC(curvnet); 2217 u_int32_t id; 2218 struct secpolicy *sp; 2219 struct mbuf *n; 2220 2221 IPSEC_ASSERT(so != NULL, ("null socket")); 2222 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2223 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2224 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2225 2226 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2227 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2228 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2229 __func__)); 2230 return key_senderror(so, m, EINVAL); 2231 } 2232 2233 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2234 2235 /* Is there SP in SPD ? */ 2236 if ((sp = key_getspbyid(id)) == NULL) { 2237 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2238 return key_senderror(so, m, ENOENT); 2239 } 2240 2241 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2242 if (n != NULL) { 2243 m_freem(m); 2244 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2245 } else 2246 return key_senderror(so, m, ENOBUFS); 2247} 2248 2249/* 2250 * SADB_X_SPDACQUIRE processing. 2251 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2252 * send 2253 * <base, policy(*)> 2254 * to KMD, and expect to receive 2255 * <base> with SADB_X_SPDACQUIRE if error occured, 2256 * or 2257 * <base, policy> 2258 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2259 * policy(*) is without policy requests. 2260 * 2261 * 0 : succeed 2262 * others: error number 2263 */ 2264int 2265key_spdacquire(sp) 2266 struct secpolicy *sp; 2267{ 2268 INIT_VNET_IPSEC(curvnet); 2269 struct mbuf *result = NULL, *m; 2270 struct secspacq *newspacq; 2271 2272 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2273 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2274 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2275 ("policy not IPSEC %u", sp->policy)); 2276 2277 /* Get an entry to check whether sent message or not. */ 2278 newspacq = key_getspacq(&sp->spidx); 2279 if (newspacq != NULL) { 2280 if (V_key_blockacq_count < newspacq->count) { 2281 /* reset counter and do send message. */ 2282 newspacq->count = 0; 2283 } else { 2284 /* increment counter and do nothing. */ 2285 newspacq->count++; 2286 return 0; 2287 } 2288 SPACQ_UNLOCK(); 2289 } else { 2290 /* make new entry for blocking to send SADB_ACQUIRE. */ 2291 newspacq = key_newspacq(&sp->spidx); 2292 if (newspacq == NULL) 2293 return ENOBUFS; 2294 } 2295 2296 /* create new sadb_msg to reply. */ 2297 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2298 if (!m) 2299 return ENOBUFS; 2300 2301 result = m; 2302 2303 result->m_pkthdr.len = 0; 2304 for (m = result; m; m = m->m_next) 2305 result->m_pkthdr.len += m->m_len; 2306 2307 mtod(result, struct sadb_msg *)->sadb_msg_len = 2308 PFKEY_UNIT64(result->m_pkthdr.len); 2309 2310 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2311} 2312 2313/* 2314 * SADB_SPDFLUSH processing 2315 * receive 2316 * <base> 2317 * from the user, and free all entries in secpctree. 2318 * and send, 2319 * <base> 2320 * to the user. 2321 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2322 * 2323 * m will always be freed. 2324 */ 2325static int 2326key_spdflush(so, m, mhp) 2327 struct socket *so; 2328 struct mbuf *m; 2329 const struct sadb_msghdr *mhp; 2330{ 2331 INIT_VNET_IPSEC(curvnet); 2332 struct sadb_msg *newmsg; 2333 struct secpolicy *sp; 2334 u_int dir; 2335 2336 IPSEC_ASSERT(so != NULL, ("null socket")); 2337 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2338 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2339 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2340 2341 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2342 return key_senderror(so, m, EINVAL); 2343 2344 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2345 SPTREE_LOCK(); 2346 LIST_FOREACH(sp, &V_sptree[dir], chain) 2347 sp->state = IPSEC_SPSTATE_DEAD; 2348 SPTREE_UNLOCK(); 2349 } 2350 2351 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2352 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2353 return key_senderror(so, m, ENOBUFS); 2354 } 2355 2356 if (m->m_next) 2357 m_freem(m->m_next); 2358 m->m_next = NULL; 2359 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2360 newmsg = mtod(m, struct sadb_msg *); 2361 newmsg->sadb_msg_errno = 0; 2362 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2363 2364 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2365} 2366 2367/* 2368 * SADB_SPDDUMP processing 2369 * receive 2370 * <base> 2371 * from the user, and dump all SP leaves 2372 * and send, 2373 * <base> ..... 2374 * to the ikmpd. 2375 * 2376 * m will always be freed. 2377 */ 2378static int 2379key_spddump(so, m, mhp) 2380 struct socket *so; 2381 struct mbuf *m; 2382 const struct sadb_msghdr *mhp; 2383{ 2384 INIT_VNET_IPSEC(curvnet); 2385 struct secpolicy *sp; 2386 int cnt; 2387 u_int dir; 2388 struct mbuf *n; 2389 2390 IPSEC_ASSERT(so != NULL, ("null socket")); 2391 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2392 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2393 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2394 2395 /* search SPD entry and get buffer size. */ 2396 cnt = 0; 2397 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2398 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2399 cnt++; 2400 } 2401 } 2402 2403 if (cnt == 0) 2404 return key_senderror(so, m, ENOENT); 2405 2406 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2407 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2408 --cnt; 2409 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2410 mhp->msg->sadb_msg_pid); 2411 2412 if (n) 2413 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2414 } 2415 } 2416 2417 m_freem(m); 2418 return 0; 2419} 2420 2421static struct mbuf * 2422key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2423{ 2424 struct mbuf *result = NULL, *m; 2425 struct seclifetime lt; 2426 2427 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2428 if (!m) 2429 goto fail; 2430 result = m; 2431 2432 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2433 &sp->spidx.src.sa, sp->spidx.prefs, 2434 sp->spidx.ul_proto); 2435 if (!m) 2436 goto fail; 2437 m_cat(result, m); 2438 2439 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2440 &sp->spidx.dst.sa, sp->spidx.prefd, 2441 sp->spidx.ul_proto); 2442 if (!m) 2443 goto fail; 2444 m_cat(result, m); 2445 2446 m = key_sp2msg(sp); 2447 if (!m) 2448 goto fail; 2449 m_cat(result, m); 2450 2451 if(sp->lifetime){ 2452 lt.addtime=sp->created; 2453 lt.usetime= sp->lastused; 2454 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2455 if (!m) 2456 goto fail; 2457 m_cat(result, m); 2458 2459 lt.addtime=sp->lifetime; 2460 lt.usetime= sp->validtime; 2461 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2462 if (!m) 2463 goto fail; 2464 m_cat(result, m); 2465 } 2466 2467 if ((result->m_flags & M_PKTHDR) == 0) 2468 goto fail; 2469 2470 if (result->m_len < sizeof(struct sadb_msg)) { 2471 result = m_pullup(result, sizeof(struct sadb_msg)); 2472 if (result == NULL) 2473 goto fail; 2474 } 2475 2476 result->m_pkthdr.len = 0; 2477 for (m = result; m; m = m->m_next) 2478 result->m_pkthdr.len += m->m_len; 2479 2480 mtod(result, struct sadb_msg *)->sadb_msg_len = 2481 PFKEY_UNIT64(result->m_pkthdr.len); 2482 2483 return result; 2484 2485fail: 2486 m_freem(result); 2487 return NULL; 2488} 2489 2490/* 2491 * get PFKEY message length for security policy and request. 2492 */ 2493static u_int 2494key_getspreqmsglen(sp) 2495 struct secpolicy *sp; 2496{ 2497 u_int tlen; 2498 2499 tlen = sizeof(struct sadb_x_policy); 2500 2501 /* if is the policy for ipsec ? */ 2502 if (sp->policy != IPSEC_POLICY_IPSEC) 2503 return tlen; 2504 2505 /* get length of ipsec requests */ 2506 { 2507 struct ipsecrequest *isr; 2508 int len; 2509 2510 for (isr = sp->req; isr != NULL; isr = isr->next) { 2511 len = sizeof(struct sadb_x_ipsecrequest) 2512 + isr->saidx.src.sa.sa_len 2513 + isr->saidx.dst.sa.sa_len; 2514 2515 tlen += PFKEY_ALIGN8(len); 2516 } 2517 } 2518 2519 return tlen; 2520} 2521 2522/* 2523 * SADB_SPDEXPIRE processing 2524 * send 2525 * <base, address(SD), lifetime(CH), policy> 2526 * to KMD by PF_KEY. 2527 * 2528 * OUT: 0 : succeed 2529 * others : error number 2530 */ 2531static int 2532key_spdexpire(sp) 2533 struct secpolicy *sp; 2534{ 2535 struct mbuf *result = NULL, *m; 2536 int len; 2537 int error = -1; 2538 struct sadb_lifetime *lt; 2539 2540 /* XXX: Why do we lock ? */ 2541 2542 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2543 2544 /* set msg header */ 2545 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2546 if (!m) { 2547 error = ENOBUFS; 2548 goto fail; 2549 } 2550 result = m; 2551 2552 /* create lifetime extension (current and hard) */ 2553 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2554 m = key_alloc_mbuf(len); 2555 if (!m || m->m_next) { /*XXX*/ 2556 if (m) 2557 m_freem(m); 2558 error = ENOBUFS; 2559 goto fail; 2560 } 2561 bzero(mtod(m, caddr_t), len); 2562 lt = mtod(m, struct sadb_lifetime *); 2563 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2564 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2565 lt->sadb_lifetime_allocations = 0; 2566 lt->sadb_lifetime_bytes = 0; 2567 lt->sadb_lifetime_addtime = sp->created; 2568 lt->sadb_lifetime_usetime = sp->lastused; 2569 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2570 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2571 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2572 lt->sadb_lifetime_allocations = 0; 2573 lt->sadb_lifetime_bytes = 0; 2574 lt->sadb_lifetime_addtime = sp->lifetime; 2575 lt->sadb_lifetime_usetime = sp->validtime; 2576 m_cat(result, m); 2577 2578 /* set sadb_address for source */ 2579 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2580 &sp->spidx.src.sa, 2581 sp->spidx.prefs, sp->spidx.ul_proto); 2582 if (!m) { 2583 error = ENOBUFS; 2584 goto fail; 2585 } 2586 m_cat(result, m); 2587 2588 /* set sadb_address for destination */ 2589 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2590 &sp->spidx.dst.sa, 2591 sp->spidx.prefd, sp->spidx.ul_proto); 2592 if (!m) { 2593 error = ENOBUFS; 2594 goto fail; 2595 } 2596 m_cat(result, m); 2597 2598 /* set secpolicy */ 2599 m = key_sp2msg(sp); 2600 if (!m) { 2601 error = ENOBUFS; 2602 goto fail; 2603 } 2604 m_cat(result, m); 2605 2606 if ((result->m_flags & M_PKTHDR) == 0) { 2607 error = EINVAL; 2608 goto fail; 2609 } 2610 2611 if (result->m_len < sizeof(struct sadb_msg)) { 2612 result = m_pullup(result, sizeof(struct sadb_msg)); 2613 if (result == NULL) { 2614 error = ENOBUFS; 2615 goto fail; 2616 } 2617 } 2618 2619 result->m_pkthdr.len = 0; 2620 for (m = result; m; m = m->m_next) 2621 result->m_pkthdr.len += m->m_len; 2622 2623 mtod(result, struct sadb_msg *)->sadb_msg_len = 2624 PFKEY_UNIT64(result->m_pkthdr.len); 2625 2626 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2627 2628 fail: 2629 if (result) 2630 m_freem(result); 2631 return error; 2632} 2633 2634/* %%% SAD management */ 2635/* 2636 * allocating a memory for new SA head, and copy from the values of mhp. 2637 * OUT: NULL : failure due to the lack of memory. 2638 * others : pointer to new SA head. 2639 */ 2640static struct secashead * 2641key_newsah(saidx) 2642 struct secasindex *saidx; 2643{ 2644 INIT_VNET_IPSEC(curvnet); 2645 struct secashead *newsah; 2646 2647 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2648 2649 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2650 if (newsah != NULL) { 2651 int i; 2652 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2653 LIST_INIT(&newsah->savtree[i]); 2654 newsah->saidx = *saidx; 2655 2656 /* add to saidxtree */ 2657 newsah->state = SADB_SASTATE_MATURE; 2658 2659 SAHTREE_LOCK(); 2660 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2661 SAHTREE_UNLOCK(); 2662 } 2663 return(newsah); 2664} 2665 2666/* 2667 * delete SA index and all SA registerd. 2668 */ 2669static void 2670key_delsah(sah) 2671 struct secashead *sah; 2672{ 2673 INIT_VNET_IPSEC(curvnet); 2674 struct secasvar *sav, *nextsav; 2675 u_int stateidx; 2676 int zombie = 0; 2677 2678 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2679 SAHTREE_LOCK_ASSERT(); 2680 2681 /* searching all SA registerd in the secindex. */ 2682 for (stateidx = 0; 2683 stateidx < _ARRAYLEN(saorder_state_any); 2684 stateidx++) { 2685 u_int state = saorder_state_any[stateidx]; 2686 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2687 if (sav->refcnt == 0) { 2688 /* sanity check */ 2689 KEY_CHKSASTATE(state, sav->state, __func__); 2690 /* do NOT call KEY_FREESAV here: it will only delete the sav if refcnt == 1, 2691 * where we already know that refcnt == 0 2692 */ 2693 key_delsav(sav); 2694 } else { 2695 /* give up to delete this sa */ 2696 zombie++; 2697 } 2698 } 2699 } 2700 if (!zombie) { /* delete only if there are savs */ 2701 /* remove from tree of SA index */ 2702 if (__LIST_CHAINED(sah)) 2703 LIST_REMOVE(sah, chain); 2704 if (sah->sa_route.ro_rt) { 2705 RTFREE(sah->sa_route.ro_rt); 2706 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2707 } 2708 free(sah, M_IPSEC_SAH); 2709 } 2710} 2711 2712/* 2713 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2714 * and copy the values of mhp into new buffer. 2715 * When SAD message type is GETSPI: 2716 * to set sequence number from acq_seq++, 2717 * to set zero to SPI. 2718 * not to call key_setsava(). 2719 * OUT: NULL : fail 2720 * others : pointer to new secasvar. 2721 * 2722 * does not modify mbuf. does not free mbuf on error. 2723 */ 2724static struct secasvar * 2725key_newsav(m, mhp, sah, errp, where, tag) 2726 struct mbuf *m; 2727 const struct sadb_msghdr *mhp; 2728 struct secashead *sah; 2729 int *errp; 2730 const char* where; 2731 int tag; 2732{ 2733 INIT_VNET_IPSEC(curvnet); 2734 struct secasvar *newsav; 2735 const struct sadb_sa *xsa; 2736 2737 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2738 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2739 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2740 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2741 2742 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2743 if (newsav == NULL) { 2744 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2745 *errp = ENOBUFS; 2746 goto done; 2747 } 2748 2749 switch (mhp->msg->sadb_msg_type) { 2750 case SADB_GETSPI: 2751 newsav->spi = 0; 2752 2753#ifdef IPSEC_DOSEQCHECK 2754 /* sync sequence number */ 2755 if (mhp->msg->sadb_msg_seq == 0) 2756 newsav->seq = 2757 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2758 else 2759#endif 2760 newsav->seq = mhp->msg->sadb_msg_seq; 2761 break; 2762 2763 case SADB_ADD: 2764 /* sanity check */ 2765 if (mhp->ext[SADB_EXT_SA] == NULL) { 2766 free(newsav, M_IPSEC_SA); 2767 newsav = NULL; 2768 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2769 __func__)); 2770 *errp = EINVAL; 2771 goto done; 2772 } 2773 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2774 newsav->spi = xsa->sadb_sa_spi; 2775 newsav->seq = mhp->msg->sadb_msg_seq; 2776 break; 2777 default: 2778 free(newsav, M_IPSEC_SA); 2779 newsav = NULL; 2780 *errp = EINVAL; 2781 goto done; 2782 } 2783 2784 2785 /* copy sav values */ 2786 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2787 *errp = key_setsaval(newsav, m, mhp); 2788 if (*errp) { 2789 free(newsav, M_IPSEC_SA); 2790 newsav = NULL; 2791 goto done; 2792 } 2793 } 2794 2795 SECASVAR_LOCK_INIT(newsav); 2796 2797 /* reset created */ 2798 newsav->created = time_second; 2799 newsav->pid = mhp->msg->sadb_msg_pid; 2800 2801 /* add to satree */ 2802 newsav->sah = sah; 2803 sa_initref(newsav); 2804 newsav->state = SADB_SASTATE_LARVAL; 2805 2806 /* XXX locking??? */ 2807 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2808 secasvar, chain); 2809done: 2810 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2811 printf("DP %s from %s:%u return SP:%p\n", __func__, 2812 where, tag, newsav)); 2813 2814 return newsav; 2815} 2816 2817/* 2818 * free() SA variable entry. 2819 */ 2820static void 2821key_cleansav(struct secasvar *sav) 2822{ 2823 /* 2824 * Cleanup xform state. Note that zeroize'ing causes the 2825 * keys to be cleared; otherwise we must do it ourself. 2826 */ 2827 if (sav->tdb_xform != NULL) { 2828 sav->tdb_xform->xf_zeroize(sav); 2829 sav->tdb_xform = NULL; 2830 } else { 2831 KASSERT(sav->iv == NULL, ("iv but no xform")); 2832 if (sav->key_auth != NULL) 2833 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2834 if (sav->key_enc != NULL) 2835 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2836 } 2837 if (sav->key_auth != NULL) { 2838 if (sav->key_auth->key_data != NULL) 2839 free(sav->key_auth->key_data, M_IPSEC_MISC); 2840 free(sav->key_auth, M_IPSEC_MISC); 2841 sav->key_auth = NULL; 2842 } 2843 if (sav->key_enc != NULL) { 2844 if (sav->key_enc->key_data != NULL) 2845 free(sav->key_enc->key_data, M_IPSEC_MISC); 2846 free(sav->key_enc, M_IPSEC_MISC); 2847 sav->key_enc = NULL; 2848 } 2849 if (sav->sched) { 2850 bzero(sav->sched, sav->schedlen); 2851 free(sav->sched, M_IPSEC_MISC); 2852 sav->sched = NULL; 2853 } 2854 if (sav->replay != NULL) { 2855 free(sav->replay, M_IPSEC_MISC); 2856 sav->replay = NULL; 2857 } 2858 if (sav->lft_c != NULL) { 2859 free(sav->lft_c, M_IPSEC_MISC); 2860 sav->lft_c = NULL; 2861 } 2862 if (sav->lft_h != NULL) { 2863 free(sav->lft_h, M_IPSEC_MISC); 2864 sav->lft_h = NULL; 2865 } 2866 if (sav->lft_s != NULL) { 2867 free(sav->lft_s, M_IPSEC_MISC); 2868 sav->lft_s = NULL; 2869 } 2870} 2871 2872/* 2873 * free() SA variable entry. 2874 */ 2875static void 2876key_delsav(sav) 2877 struct secasvar *sav; 2878{ 2879 IPSEC_ASSERT(sav != NULL, ("null sav")); 2880 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2881 2882 /* remove from SA header */ 2883 if (__LIST_CHAINED(sav)) 2884 LIST_REMOVE(sav, chain); 2885 key_cleansav(sav); 2886 SECASVAR_LOCK_DESTROY(sav); 2887 free(sav, M_IPSEC_SA); 2888} 2889 2890/* 2891 * search SAD. 2892 * OUT: 2893 * NULL : not found 2894 * others : found, pointer to a SA. 2895 */ 2896static struct secashead * 2897key_getsah(saidx) 2898 struct secasindex *saidx; 2899{ 2900 INIT_VNET_IPSEC(curvnet); 2901 struct secashead *sah; 2902 2903 SAHTREE_LOCK(); 2904 LIST_FOREACH(sah, &V_sahtree, chain) { 2905 if (sah->state == SADB_SASTATE_DEAD) 2906 continue; 2907 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2908 break; 2909 } 2910 SAHTREE_UNLOCK(); 2911 2912 return sah; 2913} 2914 2915/* 2916 * check not to be duplicated SPI. 2917 * NOTE: this function is too slow due to searching all SAD. 2918 * OUT: 2919 * NULL : not found 2920 * others : found, pointer to a SA. 2921 */ 2922static struct secasvar * 2923key_checkspidup(saidx, spi) 2924 struct secasindex *saidx; 2925 u_int32_t spi; 2926{ 2927 INIT_VNET_IPSEC(curvnet); 2928 struct secashead *sah; 2929 struct secasvar *sav; 2930 2931 /* check address family */ 2932 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2933 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2934 __func__)); 2935 return NULL; 2936 } 2937 2938 sav = NULL; 2939 /* check all SAD */ 2940 SAHTREE_LOCK(); 2941 LIST_FOREACH(sah, &V_sahtree, chain) { 2942 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2943 continue; 2944 sav = key_getsavbyspi(sah, spi); 2945 if (sav != NULL) 2946 break; 2947 } 2948 SAHTREE_UNLOCK(); 2949 2950 return sav; 2951} 2952 2953/* 2954 * search SAD litmited alive SA, protocol, SPI. 2955 * OUT: 2956 * NULL : not found 2957 * others : found, pointer to a SA. 2958 */ 2959static struct secasvar * 2960key_getsavbyspi(sah, spi) 2961 struct secashead *sah; 2962 u_int32_t spi; 2963{ 2964 INIT_VNET_IPSEC(curvnet); 2965 struct secasvar *sav; 2966 u_int stateidx, state; 2967 2968 sav = NULL; 2969 SAHTREE_LOCK_ASSERT(); 2970 /* search all status */ 2971 for (stateidx = 0; 2972 stateidx < _ARRAYLEN(saorder_state_alive); 2973 stateidx++) { 2974 2975 state = saorder_state_alive[stateidx]; 2976 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2977 2978 /* sanity check */ 2979 if (sav->state != state) { 2980 ipseclog((LOG_DEBUG, "%s: " 2981 "invalid sav->state (queue: %d SA: %d)\n", 2982 __func__, state, sav->state)); 2983 continue; 2984 } 2985 2986 if (sav->spi == spi) 2987 return sav; 2988 } 2989 } 2990 2991 return NULL; 2992} 2993 2994/* 2995 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2996 * You must update these if need. 2997 * OUT: 0: success. 2998 * !0: failure. 2999 * 3000 * does not modify mbuf. does not free mbuf on error. 3001 */ 3002static int 3003key_setsaval(sav, m, mhp) 3004 struct secasvar *sav; 3005 struct mbuf *m; 3006 const struct sadb_msghdr *mhp; 3007{ 3008 INIT_VNET_IPSEC(curvnet); 3009 int error = 0; 3010 3011 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3012 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3013 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3014 3015 /* initialization */ 3016 sav->replay = NULL; 3017 sav->key_auth = NULL; 3018 sav->key_enc = NULL; 3019 sav->sched = NULL; 3020 sav->schedlen = 0; 3021 sav->iv = NULL; 3022 sav->lft_c = NULL; 3023 sav->lft_h = NULL; 3024 sav->lft_s = NULL; 3025 sav->tdb_xform = NULL; /* transform */ 3026 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3027 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3028 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3029 3030 /* SA */ 3031 if (mhp->ext[SADB_EXT_SA] != NULL) { 3032 const struct sadb_sa *sa0; 3033 3034 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3035 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3036 error = EINVAL; 3037 goto fail; 3038 } 3039 3040 sav->alg_auth = sa0->sadb_sa_auth; 3041 sav->alg_enc = sa0->sadb_sa_encrypt; 3042 sav->flags = sa0->sadb_sa_flags; 3043 3044 /* replay window */ 3045 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3046 sav->replay = (struct secreplay *) 3047 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3048 if (sav->replay == NULL) { 3049 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3050 __func__)); 3051 error = ENOBUFS; 3052 goto fail; 3053 } 3054 if (sa0->sadb_sa_replay != 0) 3055 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3056 sav->replay->wsize = sa0->sadb_sa_replay; 3057 } 3058 } 3059 3060 /* Authentication keys */ 3061 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3062 const struct sadb_key *key0; 3063 int len; 3064 3065 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3066 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3067 3068 error = 0; 3069 if (len < sizeof(*key0)) { 3070 error = EINVAL; 3071 goto fail; 3072 } 3073 switch (mhp->msg->sadb_msg_satype) { 3074 case SADB_SATYPE_AH: 3075 case SADB_SATYPE_ESP: 3076 case SADB_X_SATYPE_TCPSIGNATURE: 3077 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3078 sav->alg_auth != SADB_X_AALG_NULL) 3079 error = EINVAL; 3080 break; 3081 case SADB_X_SATYPE_IPCOMP: 3082 default: 3083 error = EINVAL; 3084 break; 3085 } 3086 if (error) { 3087 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3088 __func__)); 3089 goto fail; 3090 } 3091 3092 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3093 M_IPSEC_MISC); 3094 if (sav->key_auth == NULL ) { 3095 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3096 __func__)); 3097 error = ENOBUFS; 3098 goto fail; 3099 } 3100 } 3101 3102 /* Encryption key */ 3103 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3104 const struct sadb_key *key0; 3105 int len; 3106 3107 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3108 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3109 3110 error = 0; 3111 if (len < sizeof(*key0)) { 3112 error = EINVAL; 3113 goto fail; 3114 } 3115 switch (mhp->msg->sadb_msg_satype) { 3116 case SADB_SATYPE_ESP: 3117 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3118 sav->alg_enc != SADB_EALG_NULL) { 3119 error = EINVAL; 3120 break; 3121 } 3122 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3123 len, 3124 M_IPSEC_MISC); 3125 if (sav->key_enc == NULL) { 3126 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3127 __func__)); 3128 error = ENOBUFS; 3129 goto fail; 3130 } 3131 break; 3132 case SADB_X_SATYPE_IPCOMP: 3133 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3134 error = EINVAL; 3135 sav->key_enc = NULL; /*just in case*/ 3136 break; 3137 case SADB_SATYPE_AH: 3138 case SADB_X_SATYPE_TCPSIGNATURE: 3139 default: 3140 error = EINVAL; 3141 break; 3142 } 3143 if (error) { 3144 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3145 __func__)); 3146 goto fail; 3147 } 3148 } 3149 3150 /* set iv */ 3151 sav->ivlen = 0; 3152 3153 switch (mhp->msg->sadb_msg_satype) { 3154 case SADB_SATYPE_AH: 3155 error = xform_init(sav, XF_AH); 3156 break; 3157 case SADB_SATYPE_ESP: 3158 error = xform_init(sav, XF_ESP); 3159 break; 3160 case SADB_X_SATYPE_IPCOMP: 3161 error = xform_init(sav, XF_IPCOMP); 3162 break; 3163 case SADB_X_SATYPE_TCPSIGNATURE: 3164 error = xform_init(sav, XF_TCPSIGNATURE); 3165 break; 3166 } 3167 if (error) { 3168 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3169 __func__, mhp->msg->sadb_msg_satype)); 3170 goto fail; 3171 } 3172 3173 /* reset created */ 3174 sav->created = time_second; 3175 3176 /* make lifetime for CURRENT */ 3177 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3178 if (sav->lft_c == NULL) { 3179 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3180 error = ENOBUFS; 3181 goto fail; 3182 } 3183 3184 sav->lft_c->allocations = 0; 3185 sav->lft_c->bytes = 0; 3186 sav->lft_c->addtime = time_second; 3187 sav->lft_c->usetime = 0; 3188 3189 /* lifetimes for HARD and SOFT */ 3190 { 3191 const struct sadb_lifetime *lft0; 3192 3193 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3194 if (lft0 != NULL) { 3195 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3196 error = EINVAL; 3197 goto fail; 3198 } 3199 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3200 if (sav->lft_h == NULL) { 3201 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3202 error = ENOBUFS; 3203 goto fail; 3204 } 3205 /* to be initialize ? */ 3206 } 3207 3208 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3209 if (lft0 != NULL) { 3210 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3211 error = EINVAL; 3212 goto fail; 3213 } 3214 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3215 if (sav->lft_s == NULL) { 3216 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3217 error = ENOBUFS; 3218 goto fail; 3219 } 3220 /* to be initialize ? */ 3221 } 3222 } 3223 3224 return 0; 3225 3226 fail: 3227 /* initialization */ 3228 key_cleansav(sav); 3229 3230 return error; 3231} 3232 3233/* 3234 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3235 * OUT: 0: valid 3236 * other: errno 3237 */ 3238static int 3239key_mature(struct secasvar *sav) 3240{ 3241 INIT_VNET_IPSEC(curvnet); 3242 int error; 3243 3244 /* check SPI value */ 3245 switch (sav->sah->saidx.proto) { 3246 case IPPROTO_ESP: 3247 case IPPROTO_AH: 3248 /* 3249 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3250 * 1-255 reserved by IANA for future use, 3251 * 0 for implementation specific, local use. 3252 */ 3253 if (ntohl(sav->spi) <= 255) { 3254 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3255 __func__, (u_int32_t)ntohl(sav->spi))); 3256 return EINVAL; 3257 } 3258 break; 3259 } 3260 3261 /* check satype */ 3262 switch (sav->sah->saidx.proto) { 3263 case IPPROTO_ESP: 3264 /* check flags */ 3265 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3266 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3267 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3268 "given to old-esp.\n", __func__)); 3269 return EINVAL; 3270 } 3271 error = xform_init(sav, XF_ESP); 3272 break; 3273 case IPPROTO_AH: 3274 /* check flags */ 3275 if (sav->flags & SADB_X_EXT_DERIV) { 3276 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3277 "given to AH SA.\n", __func__)); 3278 return EINVAL; 3279 } 3280 if (sav->alg_enc != SADB_EALG_NONE) { 3281 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3282 "mismated.\n", __func__)); 3283 return(EINVAL); 3284 } 3285 error = xform_init(sav, XF_AH); 3286 break; 3287 case IPPROTO_IPCOMP: 3288 if (sav->alg_auth != SADB_AALG_NONE) { 3289 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3290 "mismated.\n", __func__)); 3291 return(EINVAL); 3292 } 3293 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3294 && ntohl(sav->spi) >= 0x10000) { 3295 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3296 __func__)); 3297 return(EINVAL); 3298 } 3299 error = xform_init(sav, XF_IPCOMP); 3300 break; 3301 case IPPROTO_TCP: 3302 if (sav->alg_enc != SADB_EALG_NONE) { 3303 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3304 "mismated.\n", __func__)); 3305 return(EINVAL); 3306 } 3307 error = xform_init(sav, XF_TCPSIGNATURE); 3308 break; 3309 default: 3310 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3311 error = EPROTONOSUPPORT; 3312 break; 3313 } 3314 if (error == 0) { 3315 SAHTREE_LOCK(); 3316 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3317 SAHTREE_UNLOCK(); 3318 } 3319 return (error); 3320} 3321 3322/* 3323 * subroutine for SADB_GET and SADB_DUMP. 3324 */ 3325static struct mbuf * 3326key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3327 u_int32_t seq, u_int32_t pid) 3328{ 3329 struct mbuf *result = NULL, *tres = NULL, *m; 3330 int i; 3331 int dumporder[] = { 3332 SADB_EXT_SA, SADB_X_EXT_SA2, 3333 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3334 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3335 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3336 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3337 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3338 }; 3339 3340 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3341 if (m == NULL) 3342 goto fail; 3343 result = m; 3344 3345 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3346 m = NULL; 3347 switch (dumporder[i]) { 3348 case SADB_EXT_SA: 3349 m = key_setsadbsa(sav); 3350 if (!m) 3351 goto fail; 3352 break; 3353 3354 case SADB_X_EXT_SA2: 3355 m = key_setsadbxsa2(sav->sah->saidx.mode, 3356 sav->replay ? sav->replay->count : 0, 3357 sav->sah->saidx.reqid); 3358 if (!m) 3359 goto fail; 3360 break; 3361 3362 case SADB_EXT_ADDRESS_SRC: 3363 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3364 &sav->sah->saidx.src.sa, 3365 FULLMASK, IPSEC_ULPROTO_ANY); 3366 if (!m) 3367 goto fail; 3368 break; 3369 3370 case SADB_EXT_ADDRESS_DST: 3371 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3372 &sav->sah->saidx.dst.sa, 3373 FULLMASK, IPSEC_ULPROTO_ANY); 3374 if (!m) 3375 goto fail; 3376 break; 3377 3378 case SADB_EXT_KEY_AUTH: 3379 if (!sav->key_auth) 3380 continue; 3381 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3382 if (!m) 3383 goto fail; 3384 break; 3385 3386 case SADB_EXT_KEY_ENCRYPT: 3387 if (!sav->key_enc) 3388 continue; 3389 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3390 if (!m) 3391 goto fail; 3392 break; 3393 3394 case SADB_EXT_LIFETIME_CURRENT: 3395 if (!sav->lft_c) 3396 continue; 3397 m = key_setlifetime(sav->lft_c, 3398 SADB_EXT_LIFETIME_CURRENT); 3399 if (!m) 3400 goto fail; 3401 break; 3402 3403 case SADB_EXT_LIFETIME_HARD: 3404 if (!sav->lft_h) 3405 continue; 3406 m = key_setlifetime(sav->lft_h, 3407 SADB_EXT_LIFETIME_HARD); 3408 if (!m) 3409 goto fail; 3410 break; 3411 3412 case SADB_EXT_LIFETIME_SOFT: 3413 if (!sav->lft_s) 3414 continue; 3415 m = key_setlifetime(sav->lft_s, 3416 SADB_EXT_LIFETIME_SOFT); 3417 3418 if (!m) 3419 goto fail; 3420 break; 3421 3422 case SADB_EXT_ADDRESS_PROXY: 3423 case SADB_EXT_IDENTITY_SRC: 3424 case SADB_EXT_IDENTITY_DST: 3425 /* XXX: should we brought from SPD ? */ 3426 case SADB_EXT_SENSITIVITY: 3427 default: 3428 continue; 3429 } 3430 3431 if (!m) 3432 goto fail; 3433 if (tres) 3434 m_cat(m, tres); 3435 tres = m; 3436 3437 } 3438 3439 m_cat(result, tres); 3440 if (result->m_len < sizeof(struct sadb_msg)) { 3441 result = m_pullup(result, sizeof(struct sadb_msg)); 3442 if (result == NULL) 3443 goto fail; 3444 } 3445 3446 result->m_pkthdr.len = 0; 3447 for (m = result; m; m = m->m_next) 3448 result->m_pkthdr.len += m->m_len; 3449 3450 mtod(result, struct sadb_msg *)->sadb_msg_len = 3451 PFKEY_UNIT64(result->m_pkthdr.len); 3452 3453 return result; 3454 3455fail: 3456 m_freem(result); 3457 m_freem(tres); 3458 return NULL; 3459} 3460 3461/* 3462 * set data into sadb_msg. 3463 */ 3464static struct mbuf * 3465key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3466 pid_t pid, u_int16_t reserved) 3467{ 3468 struct mbuf *m; 3469 struct sadb_msg *p; 3470 int len; 3471 3472 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3473 if (len > MCLBYTES) 3474 return NULL; 3475 MGETHDR(m, M_DONTWAIT, MT_DATA); 3476 if (m && len > MHLEN) { 3477 MCLGET(m, M_DONTWAIT); 3478 if ((m->m_flags & M_EXT) == 0) { 3479 m_freem(m); 3480 m = NULL; 3481 } 3482 } 3483 if (!m) 3484 return NULL; 3485 m->m_pkthdr.len = m->m_len = len; 3486 m->m_next = NULL; 3487 3488 p = mtod(m, struct sadb_msg *); 3489 3490 bzero(p, len); 3491 p->sadb_msg_version = PF_KEY_V2; 3492 p->sadb_msg_type = type; 3493 p->sadb_msg_errno = 0; 3494 p->sadb_msg_satype = satype; 3495 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3496 p->sadb_msg_reserved = reserved; 3497 p->sadb_msg_seq = seq; 3498 p->sadb_msg_pid = (u_int32_t)pid; 3499 3500 return m; 3501} 3502 3503/* 3504 * copy secasvar data into sadb_address. 3505 */ 3506static struct mbuf * 3507key_setsadbsa(sav) 3508 struct secasvar *sav; 3509{ 3510 struct mbuf *m; 3511 struct sadb_sa *p; 3512 int len; 3513 3514 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3515 m = key_alloc_mbuf(len); 3516 if (!m || m->m_next) { /*XXX*/ 3517 if (m) 3518 m_freem(m); 3519 return NULL; 3520 } 3521 3522 p = mtod(m, struct sadb_sa *); 3523 3524 bzero(p, len); 3525 p->sadb_sa_len = PFKEY_UNIT64(len); 3526 p->sadb_sa_exttype = SADB_EXT_SA; 3527 p->sadb_sa_spi = sav->spi; 3528 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3529 p->sadb_sa_state = sav->state; 3530 p->sadb_sa_auth = sav->alg_auth; 3531 p->sadb_sa_encrypt = sav->alg_enc; 3532 p->sadb_sa_flags = sav->flags; 3533 3534 return m; 3535} 3536 3537/* 3538 * set data into sadb_address. 3539 */ 3540static struct mbuf * 3541key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3542{ 3543 struct mbuf *m; 3544 struct sadb_address *p; 3545 size_t len; 3546 3547 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3548 PFKEY_ALIGN8(saddr->sa_len); 3549 m = key_alloc_mbuf(len); 3550 if (!m || m->m_next) { /*XXX*/ 3551 if (m) 3552 m_freem(m); 3553 return NULL; 3554 } 3555 3556 p = mtod(m, struct sadb_address *); 3557 3558 bzero(p, len); 3559 p->sadb_address_len = PFKEY_UNIT64(len); 3560 p->sadb_address_exttype = exttype; 3561 p->sadb_address_proto = ul_proto; 3562 if (prefixlen == FULLMASK) { 3563 switch (saddr->sa_family) { 3564 case AF_INET: 3565 prefixlen = sizeof(struct in_addr) << 3; 3566 break; 3567 case AF_INET6: 3568 prefixlen = sizeof(struct in6_addr) << 3; 3569 break; 3570 default: 3571 ; /*XXX*/ 3572 } 3573 } 3574 p->sadb_address_prefixlen = prefixlen; 3575 p->sadb_address_reserved = 0; 3576 3577 bcopy(saddr, 3578 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3579 saddr->sa_len); 3580 3581 return m; 3582} 3583 3584/* 3585 * set data into sadb_x_sa2. 3586 */ 3587static struct mbuf * 3588key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3589{ 3590 struct mbuf *m; 3591 struct sadb_x_sa2 *p; 3592 size_t len; 3593 3594 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3595 m = key_alloc_mbuf(len); 3596 if (!m || m->m_next) { /*XXX*/ 3597 if (m) 3598 m_freem(m); 3599 return NULL; 3600 } 3601 3602 p = mtod(m, struct sadb_x_sa2 *); 3603 3604 bzero(p, len); 3605 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3606 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3607 p->sadb_x_sa2_mode = mode; 3608 p->sadb_x_sa2_reserved1 = 0; 3609 p->sadb_x_sa2_reserved2 = 0; 3610 p->sadb_x_sa2_sequence = seq; 3611 p->sadb_x_sa2_reqid = reqid; 3612 3613 return m; 3614} 3615 3616/* 3617 * set data into sadb_x_policy 3618 */ 3619static struct mbuf * 3620key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3621{ 3622 struct mbuf *m; 3623 struct sadb_x_policy *p; 3624 size_t len; 3625 3626 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3627 m = key_alloc_mbuf(len); 3628 if (!m || m->m_next) { /*XXX*/ 3629 if (m) 3630 m_freem(m); 3631 return NULL; 3632 } 3633 3634 p = mtod(m, struct sadb_x_policy *); 3635 3636 bzero(p, len); 3637 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3638 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3639 p->sadb_x_policy_type = type; 3640 p->sadb_x_policy_dir = dir; 3641 p->sadb_x_policy_id = id; 3642 3643 return m; 3644} 3645 3646/* %%% utilities */ 3647/* Take a key message (sadb_key) from the socket and turn it into one 3648 * of the kernel's key structures (seckey). 3649 * 3650 * IN: pointer to the src 3651 * OUT: NULL no more memory 3652 */ 3653struct seckey * 3654key_dup_keymsg(const struct sadb_key *src, u_int len, 3655 struct malloc_type *type) 3656{ 3657 INIT_VNET_IPSEC(curvnet); 3658 struct seckey *dst; 3659 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3660 if (dst != NULL) { 3661 dst->bits = src->sadb_key_bits; 3662 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3663 if (dst->key_data != NULL) { 3664 bcopy((const char *)src + sizeof(struct sadb_key), 3665 dst->key_data, len); 3666 } else { 3667 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3668 __func__)); 3669 free(dst, type); 3670 dst = NULL; 3671 } 3672 } else { 3673 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3674 __func__)); 3675 3676 } 3677 return dst; 3678} 3679 3680/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3681 * turn it into one of the kernel's lifetime structures (seclifetime). 3682 * 3683 * IN: pointer to the destination, source and malloc type 3684 * OUT: NULL, no more memory 3685 */ 3686 3687static struct seclifetime * 3688key_dup_lifemsg(const struct sadb_lifetime *src, 3689 struct malloc_type *type) 3690{ 3691 INIT_VNET_IPSEC(curvnet); 3692 struct seclifetime *dst = NULL; 3693 3694 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3695 type, M_NOWAIT); 3696 if (dst == NULL) { 3697 /* XXX counter */ 3698 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3699 } else { 3700 dst->allocations = src->sadb_lifetime_allocations; 3701 dst->bytes = src->sadb_lifetime_bytes; 3702 dst->addtime = src->sadb_lifetime_addtime; 3703 dst->usetime = src->sadb_lifetime_usetime; 3704 } 3705 return dst; 3706} 3707 3708/* compare my own address 3709 * OUT: 1: true, i.e. my address. 3710 * 0: false 3711 */ 3712int 3713key_ismyaddr(sa) 3714 struct sockaddr *sa; 3715{ 3716#ifdef INET 3717 INIT_VNET_INET(curvnet); 3718 struct sockaddr_in *sin; 3719 struct in_ifaddr *ia; 3720#endif 3721 3722 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3723 3724 switch (sa->sa_family) { 3725#ifdef INET 3726 case AF_INET: 3727 sin = (struct sockaddr_in *)sa; 3728 for (ia = V_in_ifaddrhead.tqh_first; ia; 3729 ia = ia->ia_link.tqe_next) 3730 { 3731 if (sin->sin_family == ia->ia_addr.sin_family && 3732 sin->sin_len == ia->ia_addr.sin_len && 3733 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3734 { 3735 return 1; 3736 } 3737 } 3738 break; 3739#endif 3740#ifdef INET6 3741 case AF_INET6: 3742 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3743#endif 3744 } 3745 3746 return 0; 3747} 3748 3749#ifdef INET6 3750/* 3751 * compare my own address for IPv6. 3752 * 1: ours 3753 * 0: other 3754 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3755 */ 3756#include <netinet6/in6_var.h> 3757 3758static int 3759key_ismyaddr6(sin6) 3760 struct sockaddr_in6 *sin6; 3761{ 3762 INIT_VNET_INET6(curvnet); 3763 struct in6_ifaddr *ia; 3764 struct in6_multi *in6m; 3765 3766 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3767 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3768 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3769 return 1; 3770 3771 /* 3772 * XXX Multicast 3773 * XXX why do we care about multlicast here while we don't care 3774 * about IPv4 multicast?? 3775 * XXX scope 3776 */ 3777 in6m = NULL; 3778 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3779 if (in6m) 3780 return 1; 3781 } 3782 3783 /* loopback, just for safety */ 3784 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3785 return 1; 3786 3787 return 0; 3788} 3789#endif /*INET6*/ 3790 3791/* 3792 * compare two secasindex structure. 3793 * flag can specify to compare 2 saidxes. 3794 * compare two secasindex structure without both mode and reqid. 3795 * don't compare port. 3796 * IN: 3797 * saidx0: source, it can be in SAD. 3798 * saidx1: object. 3799 * OUT: 3800 * 1 : equal 3801 * 0 : not equal 3802 */ 3803static int 3804key_cmpsaidx( 3805 const struct secasindex *saidx0, 3806 const struct secasindex *saidx1, 3807 int flag) 3808{ 3809 /* sanity */ 3810 if (saidx0 == NULL && saidx1 == NULL) 3811 return 1; 3812 3813 if (saidx0 == NULL || saidx1 == NULL) 3814 return 0; 3815 3816 if (saidx0->proto != saidx1->proto) 3817 return 0; 3818 3819 if (flag == CMP_EXACTLY) { 3820 if (saidx0->mode != saidx1->mode) 3821 return 0; 3822 if (saidx0->reqid != saidx1->reqid) 3823 return 0; 3824 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3825 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3826 return 0; 3827 } else { 3828 3829 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3830 if (flag == CMP_MODE_REQID 3831 ||flag == CMP_REQID) { 3832 /* 3833 * If reqid of SPD is non-zero, unique SA is required. 3834 * The result must be of same reqid in this case. 3835 */ 3836 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3837 return 0; 3838 } 3839 3840 if (flag == CMP_MODE_REQID) { 3841 if (saidx0->mode != IPSEC_MODE_ANY 3842 && saidx0->mode != saidx1->mode) 3843 return 0; 3844 } 3845 3846 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3847 return 0; 3848 } 3849 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3850 return 0; 3851 } 3852 } 3853 3854 return 1; 3855} 3856 3857/* 3858 * compare two secindex structure exactly. 3859 * IN: 3860 * spidx0: source, it is often in SPD. 3861 * spidx1: object, it is often from PFKEY message. 3862 * OUT: 3863 * 1 : equal 3864 * 0 : not equal 3865 */ 3866static int 3867key_cmpspidx_exactly( 3868 struct secpolicyindex *spidx0, 3869 struct secpolicyindex *spidx1) 3870{ 3871 /* sanity */ 3872 if (spidx0 == NULL && spidx1 == NULL) 3873 return 1; 3874 3875 if (spidx0 == NULL || spidx1 == NULL) 3876 return 0; 3877 3878 if (spidx0->prefs != spidx1->prefs 3879 || spidx0->prefd != spidx1->prefd 3880 || spidx0->ul_proto != spidx1->ul_proto) 3881 return 0; 3882 3883 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3884 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3885} 3886 3887/* 3888 * compare two secindex structure with mask. 3889 * IN: 3890 * spidx0: source, it is often in SPD. 3891 * spidx1: object, it is often from IP header. 3892 * OUT: 3893 * 1 : equal 3894 * 0 : not equal 3895 */ 3896static int 3897key_cmpspidx_withmask( 3898 struct secpolicyindex *spidx0, 3899 struct secpolicyindex *spidx1) 3900{ 3901 /* sanity */ 3902 if (spidx0 == NULL && spidx1 == NULL) 3903 return 1; 3904 3905 if (spidx0 == NULL || spidx1 == NULL) 3906 return 0; 3907 3908 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3909 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3910 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3911 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3912 return 0; 3913 3914 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3915 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3916 && spidx0->ul_proto != spidx1->ul_proto) 3917 return 0; 3918 3919 switch (spidx0->src.sa.sa_family) { 3920 case AF_INET: 3921 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3922 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3923 return 0; 3924 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3925 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3926 return 0; 3927 break; 3928 case AF_INET6: 3929 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3930 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3931 return 0; 3932 /* 3933 * scope_id check. if sin6_scope_id is 0, we regard it 3934 * as a wildcard scope, which matches any scope zone ID. 3935 */ 3936 if (spidx0->src.sin6.sin6_scope_id && 3937 spidx1->src.sin6.sin6_scope_id && 3938 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3939 return 0; 3940 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3941 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3942 return 0; 3943 break; 3944 default: 3945 /* XXX */ 3946 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3947 return 0; 3948 break; 3949 } 3950 3951 switch (spidx0->dst.sa.sa_family) { 3952 case AF_INET: 3953 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3954 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3955 return 0; 3956 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3957 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3958 return 0; 3959 break; 3960 case AF_INET6: 3961 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3962 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3963 return 0; 3964 /* 3965 * scope_id check. if sin6_scope_id is 0, we regard it 3966 * as a wildcard scope, which matches any scope zone ID. 3967 */ 3968 if (spidx0->dst.sin6.sin6_scope_id && 3969 spidx1->dst.sin6.sin6_scope_id && 3970 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3971 return 0; 3972 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3973 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3974 return 0; 3975 break; 3976 default: 3977 /* XXX */ 3978 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3979 return 0; 3980 break; 3981 } 3982 3983 /* XXX Do we check other field ? e.g. flowinfo */ 3984 3985 return 1; 3986} 3987 3988/* returns 0 on match */ 3989static int 3990key_sockaddrcmp( 3991 const struct sockaddr *sa1, 3992 const struct sockaddr *sa2, 3993 int port) 3994{ 3995#ifdef satosin 3996#undef satosin 3997#endif 3998#define satosin(s) ((const struct sockaddr_in *)s) 3999#ifdef satosin6 4000#undef satosin6 4001#endif 4002#define satosin6(s) ((const struct sockaddr_in6 *)s) 4003 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4004 return 1; 4005 4006 switch (sa1->sa_family) { 4007 case AF_INET: 4008 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4009 return 1; 4010 if (satosin(sa1)->sin_addr.s_addr != 4011 satosin(sa2)->sin_addr.s_addr) { 4012 return 1; 4013 } 4014 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4015 return 1; 4016 break; 4017 case AF_INET6: 4018 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4019 return 1; /*EINVAL*/ 4020 if (satosin6(sa1)->sin6_scope_id != 4021 satosin6(sa2)->sin6_scope_id) { 4022 return 1; 4023 } 4024 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4025 &satosin6(sa2)->sin6_addr)) { 4026 return 1; 4027 } 4028 if (port && 4029 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4030 return 1; 4031 } 4032 break; 4033 default: 4034 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4035 return 1; 4036 break; 4037 } 4038 4039 return 0; 4040#undef satosin 4041#undef satosin6 4042} 4043 4044/* 4045 * compare two buffers with mask. 4046 * IN: 4047 * addr1: source 4048 * addr2: object 4049 * bits: Number of bits to compare 4050 * OUT: 4051 * 1 : equal 4052 * 0 : not equal 4053 */ 4054static int 4055key_bbcmp(const void *a1, const void *a2, u_int bits) 4056{ 4057 const unsigned char *p1 = a1; 4058 const unsigned char *p2 = a2; 4059 4060 /* XXX: This could be considerably faster if we compare a word 4061 * at a time, but it is complicated on LSB Endian machines */ 4062 4063 /* Handle null pointers */ 4064 if (p1 == NULL || p2 == NULL) 4065 return (p1 == p2); 4066 4067 while (bits >= 8) { 4068 if (*p1++ != *p2++) 4069 return 0; 4070 bits -= 8; 4071 } 4072 4073 if (bits > 0) { 4074 u_int8_t mask = ~((1<<(8-bits))-1); 4075 if ((*p1 & mask) != (*p2 & mask)) 4076 return 0; 4077 } 4078 return 1; /* Match! */ 4079} 4080 4081static void 4082key_flush_spd(time_t now) 4083{ 4084 INIT_VNET_IPSEC(curvnet); 4085 static u_int16_t sptree_scangen = 0; 4086 u_int16_t gen = sptree_scangen++; 4087 struct secpolicy *sp; 4088 u_int dir; 4089 4090 /* SPD */ 4091 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4092restart: 4093 SPTREE_LOCK(); 4094 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4095 if (sp->scangen == gen) /* previously handled */ 4096 continue; 4097 sp->scangen = gen; 4098 if (sp->state == IPSEC_SPSTATE_DEAD) { 4099 /* NB: clean entries created by key_spdflush */ 4100 SPTREE_UNLOCK(); 4101 KEY_FREESP(&sp); 4102 goto restart; 4103 } 4104 if (sp->lifetime == 0 && sp->validtime == 0) 4105 continue; 4106 if ((sp->lifetime && now - sp->created > sp->lifetime) 4107 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4108 sp->state = IPSEC_SPSTATE_DEAD; 4109 SPTREE_UNLOCK(); 4110 key_spdexpire(sp); 4111 KEY_FREESP(&sp); 4112 goto restart; 4113 } 4114 } 4115 SPTREE_UNLOCK(); 4116 } 4117} 4118 4119static void 4120key_flush_sad(time_t now) 4121{ 4122 INIT_VNET_IPSEC(curvnet); 4123 struct secashead *sah, *nextsah; 4124 struct secasvar *sav, *nextsav; 4125 4126 /* SAD */ 4127 SAHTREE_LOCK(); 4128 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4129 /* if sah has been dead, then delete it and process next sah. */ 4130 if (sah->state == SADB_SASTATE_DEAD) { 4131 key_delsah(sah); 4132 continue; 4133 } 4134 4135 /* if LARVAL entry doesn't become MATURE, delete it. */ 4136 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4137 /* Need to also check refcnt for a larval SA ??? 4138 */ 4139 if (now - sav->created > V_key_larval_lifetime) 4140 KEY_FREESAV(&sav); 4141 } 4142 4143 /* 4144 * check MATURE entry to start to send expire message 4145 * whether or not. 4146 */ 4147 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4148 /* we don't need to check. */ 4149 if (sav->lft_s == NULL) 4150 continue; 4151 4152 /* sanity check */ 4153 if (sav->lft_c == NULL) { 4154 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4155 "time, why?\n", __func__)); 4156 continue; 4157 } 4158 4159 /* check SOFT lifetime */ 4160 if (sav->lft_s->addtime != 0 && 4161 now - sav->created > sav->lft_s->addtime) { 4162 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4163 /* Actually, only send expire message if SA has been used, as it 4164 * was done before, but should we always send such message, and let IKE 4165 * daemon decide if it should be renegociated or not ? 4166 * XXX expire message will actually NOT be sent if SA is only used 4167 * after soft lifetime has been reached, see below (DYING state) 4168 */ 4169 if (sav->lft_c->usetime != 0) 4170 key_expire(sav); 4171 } 4172 /* check SOFT lifetime by bytes */ 4173 /* 4174 * XXX I don't know the way to delete this SA 4175 * when new SA is installed. Caution when it's 4176 * installed too big lifetime by time. 4177 */ 4178 else if (sav->lft_s->bytes != 0 && 4179 sav->lft_s->bytes < sav->lft_c->bytes) { 4180 4181 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4182 /* 4183 * XXX If we keep to send expire 4184 * message in the status of 4185 * DYING. Do remove below code. 4186 */ 4187 key_expire(sav); 4188 } 4189 } 4190 4191 /* check DYING entry to change status to DEAD. */ 4192 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4193 /* we don't need to check. */ 4194 if (sav->lft_h == NULL) 4195 continue; 4196 4197 /* sanity check */ 4198 if (sav->lft_c == NULL) { 4199 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4200 "time, why?\n", __func__)); 4201 continue; 4202 } 4203 4204 if (sav->lft_h->addtime != 0 && 4205 now - sav->created > sav->lft_h->addtime) { 4206 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4207 KEY_FREESAV(&sav); 4208 } 4209#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4210 else if (sav->lft_s != NULL 4211 && sav->lft_s->addtime != 0 4212 && now - sav->created > sav->lft_s->addtime) { 4213 /* 4214 * XXX: should be checked to be 4215 * installed the valid SA. 4216 */ 4217 4218 /* 4219 * If there is no SA then sending 4220 * expire message. 4221 */ 4222 key_expire(sav); 4223 } 4224#endif 4225 /* check HARD lifetime by bytes */ 4226 else if (sav->lft_h->bytes != 0 && 4227 sav->lft_h->bytes < sav->lft_c->bytes) { 4228 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4229 KEY_FREESAV(&sav); 4230 } 4231 } 4232 4233 /* delete entry in DEAD */ 4234 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4235 /* sanity check */ 4236 if (sav->state != SADB_SASTATE_DEAD) { 4237 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4238 "(queue: %d SA: %d): kill it anyway\n", 4239 __func__, 4240 SADB_SASTATE_DEAD, sav->state)); 4241 } 4242 /* 4243 * do not call key_freesav() here. 4244 * sav should already be freed, and sav->refcnt 4245 * shows other references to sav 4246 * (such as from SPD). 4247 */ 4248 } 4249 } 4250 SAHTREE_UNLOCK(); 4251} 4252 4253static void 4254key_flush_acq(time_t now) 4255{ 4256 INIT_VNET_IPSEC(curvnet); 4257 struct secacq *acq, *nextacq; 4258 4259 /* ACQ tree */ 4260 ACQ_LOCK(); 4261 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4262 nextacq = LIST_NEXT(acq, chain); 4263 if (now - acq->created > V_key_blockacq_lifetime 4264 && __LIST_CHAINED(acq)) { 4265 LIST_REMOVE(acq, chain); 4266 free(acq, M_IPSEC_SAQ); 4267 } 4268 } 4269 ACQ_UNLOCK(); 4270} 4271 4272static void 4273key_flush_spacq(time_t now) 4274{ 4275 INIT_VNET_IPSEC(curvnet); 4276 struct secspacq *acq, *nextacq; 4277 4278 /* SP ACQ tree */ 4279 SPACQ_LOCK(); 4280 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4281 nextacq = LIST_NEXT(acq, chain); 4282 if (now - acq->created > V_key_blockacq_lifetime 4283 && __LIST_CHAINED(acq)) { 4284 LIST_REMOVE(acq, chain); 4285 free(acq, M_IPSEC_SAQ); 4286 } 4287 } 4288 SPACQ_UNLOCK(); 4289} 4290 4291/* 4292 * time handler. 4293 * scanning SPD and SAD to check status for each entries, 4294 * and do to remove or to expire. 4295 * XXX: year 2038 problem may remain. 4296 */ 4297void 4298key_timehandler(void) 4299{ 4300 VNET_ITERATOR_DECL(vnet_iter); 4301 time_t now = time_second; 4302 4303 VNET_LIST_RLOCK(); 4304 VNET_FOREACH(vnet_iter) { 4305 CURVNET_SET(vnet_iter); 4306 key_flush_spd(now); 4307 key_flush_sad(now); 4308 key_flush_acq(now); 4309 key_flush_spacq(now); 4310 CURVNET_RESTORE(); 4311 } 4312 VNET_LIST_RUNLOCK(); 4313 4314#ifndef IPSEC_DEBUG2 4315 /* do exchange to tick time !! */ 4316 (void)timeout((void *)key_timehandler, (void *)0, hz); 4317#endif /* IPSEC_DEBUG2 */ 4318} 4319 4320u_long 4321key_random() 4322{ 4323 u_long value; 4324 4325 key_randomfill(&value, sizeof(value)); 4326 return value; 4327} 4328 4329void 4330key_randomfill(p, l) 4331 void *p; 4332 size_t l; 4333{ 4334 size_t n; 4335 u_long v; 4336 static int warn = 1; 4337 4338 n = 0; 4339 n = (size_t)read_random(p, (u_int)l); 4340 /* last resort */ 4341 while (n < l) { 4342 v = random(); 4343 bcopy(&v, (u_int8_t *)p + n, 4344 l - n < sizeof(v) ? l - n : sizeof(v)); 4345 n += sizeof(v); 4346 4347 if (warn) { 4348 printf("WARNING: pseudo-random number generator " 4349 "used for IPsec processing\n"); 4350 warn = 0; 4351 } 4352 } 4353} 4354 4355/* 4356 * map SADB_SATYPE_* to IPPROTO_*. 4357 * if satype == SADB_SATYPE then satype is mapped to ~0. 4358 * OUT: 4359 * 0: invalid satype. 4360 */ 4361static u_int16_t 4362key_satype2proto(u_int8_t satype) 4363{ 4364 switch (satype) { 4365 case SADB_SATYPE_UNSPEC: 4366 return IPSEC_PROTO_ANY; 4367 case SADB_SATYPE_AH: 4368 return IPPROTO_AH; 4369 case SADB_SATYPE_ESP: 4370 return IPPROTO_ESP; 4371 case SADB_X_SATYPE_IPCOMP: 4372 return IPPROTO_IPCOMP; 4373 case SADB_X_SATYPE_TCPSIGNATURE: 4374 return IPPROTO_TCP; 4375 default: 4376 return 0; 4377 } 4378 /* NOTREACHED */ 4379} 4380 4381/* 4382 * map IPPROTO_* to SADB_SATYPE_* 4383 * OUT: 4384 * 0: invalid protocol type. 4385 */ 4386static u_int8_t 4387key_proto2satype(u_int16_t proto) 4388{ 4389 switch (proto) { 4390 case IPPROTO_AH: 4391 return SADB_SATYPE_AH; 4392 case IPPROTO_ESP: 4393 return SADB_SATYPE_ESP; 4394 case IPPROTO_IPCOMP: 4395 return SADB_X_SATYPE_IPCOMP; 4396 case IPPROTO_TCP: 4397 return SADB_X_SATYPE_TCPSIGNATURE; 4398 default: 4399 return 0; 4400 } 4401 /* NOTREACHED */ 4402} 4403 4404/* %%% PF_KEY */ 4405/* 4406 * SADB_GETSPI processing is to receive 4407 * <base, (SA2), src address, dst address, (SPI range)> 4408 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4409 * tree with the status of LARVAL, and send 4410 * <base, SA(*), address(SD)> 4411 * to the IKMPd. 4412 * 4413 * IN: mhp: pointer to the pointer to each header. 4414 * OUT: NULL if fail. 4415 * other if success, return pointer to the message to send. 4416 */ 4417static int 4418key_getspi(so, m, mhp) 4419 struct socket *so; 4420 struct mbuf *m; 4421 const struct sadb_msghdr *mhp; 4422{ 4423 INIT_VNET_IPSEC(curvnet); 4424 struct sadb_address *src0, *dst0; 4425 struct secasindex saidx; 4426 struct secashead *newsah; 4427 struct secasvar *newsav; 4428 u_int8_t proto; 4429 u_int32_t spi; 4430 u_int8_t mode; 4431 u_int32_t reqid; 4432 int error; 4433 4434 IPSEC_ASSERT(so != NULL, ("null socket")); 4435 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4436 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4437 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4438 4439 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4440 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4441 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4442 __func__)); 4443 return key_senderror(so, m, EINVAL); 4444 } 4445 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4446 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4447 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4448 __func__)); 4449 return key_senderror(so, m, EINVAL); 4450 } 4451 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4452 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4453 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4454 } else { 4455 mode = IPSEC_MODE_ANY; 4456 reqid = 0; 4457 } 4458 4459 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4460 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4461 4462 /* map satype to proto */ 4463 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4464 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4465 __func__)); 4466 return key_senderror(so, m, EINVAL); 4467 } 4468 4469 /* make sure if port number is zero. */ 4470 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4471 case AF_INET: 4472 if (((struct sockaddr *)(src0 + 1))->sa_len != 4473 sizeof(struct sockaddr_in)) 4474 return key_senderror(so, m, EINVAL); 4475 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4476 break; 4477 case AF_INET6: 4478 if (((struct sockaddr *)(src0 + 1))->sa_len != 4479 sizeof(struct sockaddr_in6)) 4480 return key_senderror(so, m, EINVAL); 4481 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4482 break; 4483 default: 4484 ; /*???*/ 4485 } 4486 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4487 case AF_INET: 4488 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4489 sizeof(struct sockaddr_in)) 4490 return key_senderror(so, m, EINVAL); 4491 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4492 break; 4493 case AF_INET6: 4494 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4495 sizeof(struct sockaddr_in6)) 4496 return key_senderror(so, m, EINVAL); 4497 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4498 break; 4499 default: 4500 ; /*???*/ 4501 } 4502 4503 /* XXX boundary check against sa_len */ 4504 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4505 4506 /* SPI allocation */ 4507 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4508 &saidx); 4509 if (spi == 0) 4510 return key_senderror(so, m, EINVAL); 4511 4512 /* get a SA index */ 4513 if ((newsah = key_getsah(&saidx)) == NULL) { 4514 /* create a new SA index */ 4515 if ((newsah = key_newsah(&saidx)) == NULL) { 4516 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4517 return key_senderror(so, m, ENOBUFS); 4518 } 4519 } 4520 4521 /* get a new SA */ 4522 /* XXX rewrite */ 4523 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4524 if (newsav == NULL) { 4525 /* XXX don't free new SA index allocated in above. */ 4526 return key_senderror(so, m, error); 4527 } 4528 4529 /* set spi */ 4530 newsav->spi = htonl(spi); 4531 4532 /* delete the entry in acqtree */ 4533 if (mhp->msg->sadb_msg_seq != 0) { 4534 struct secacq *acq; 4535 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4536 /* reset counter in order to deletion by timehandler. */ 4537 acq->created = time_second; 4538 acq->count = 0; 4539 } 4540 } 4541 4542 { 4543 struct mbuf *n, *nn; 4544 struct sadb_sa *m_sa; 4545 struct sadb_msg *newmsg; 4546 int off, len; 4547 4548 /* create new sadb_msg to reply. */ 4549 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4550 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4551 4552 MGETHDR(n, M_DONTWAIT, MT_DATA); 4553 if (len > MHLEN) { 4554 MCLGET(n, M_DONTWAIT); 4555 if ((n->m_flags & M_EXT) == 0) { 4556 m_freem(n); 4557 n = NULL; 4558 } 4559 } 4560 if (!n) 4561 return key_senderror(so, m, ENOBUFS); 4562 4563 n->m_len = len; 4564 n->m_next = NULL; 4565 off = 0; 4566 4567 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4568 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4569 4570 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4571 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4572 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4573 m_sa->sadb_sa_spi = htonl(spi); 4574 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4575 4576 IPSEC_ASSERT(off == len, 4577 ("length inconsistency (off %u len %u)", off, len)); 4578 4579 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4580 SADB_EXT_ADDRESS_DST); 4581 if (!n->m_next) { 4582 m_freem(n); 4583 return key_senderror(so, m, ENOBUFS); 4584 } 4585 4586 if (n->m_len < sizeof(struct sadb_msg)) { 4587 n = m_pullup(n, sizeof(struct sadb_msg)); 4588 if (n == NULL) 4589 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4590 } 4591 4592 n->m_pkthdr.len = 0; 4593 for (nn = n; nn; nn = nn->m_next) 4594 n->m_pkthdr.len += nn->m_len; 4595 4596 newmsg = mtod(n, struct sadb_msg *); 4597 newmsg->sadb_msg_seq = newsav->seq; 4598 newmsg->sadb_msg_errno = 0; 4599 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4600 4601 m_freem(m); 4602 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4603 } 4604} 4605 4606/* 4607 * allocating new SPI 4608 * called by key_getspi(). 4609 * OUT: 4610 * 0: failure. 4611 * others: success. 4612 */ 4613static u_int32_t 4614key_do_getnewspi(spirange, saidx) 4615 struct sadb_spirange *spirange; 4616 struct secasindex *saidx; 4617{ 4618 INIT_VNET_IPSEC(curvnet); 4619 u_int32_t newspi; 4620 u_int32_t min, max; 4621 int count = V_key_spi_trycnt; 4622 4623 /* set spi range to allocate */ 4624 if (spirange != NULL) { 4625 min = spirange->sadb_spirange_min; 4626 max = spirange->sadb_spirange_max; 4627 } else { 4628 min = V_key_spi_minval; 4629 max = V_key_spi_maxval; 4630 } 4631 /* IPCOMP needs 2-byte SPI */ 4632 if (saidx->proto == IPPROTO_IPCOMP) { 4633 u_int32_t t; 4634 if (min >= 0x10000) 4635 min = 0xffff; 4636 if (max >= 0x10000) 4637 max = 0xffff; 4638 if (min > max) { 4639 t = min; min = max; max = t; 4640 } 4641 } 4642 4643 if (min == max) { 4644 if (key_checkspidup(saidx, min) != NULL) { 4645 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4646 __func__, min)); 4647 return 0; 4648 } 4649 4650 count--; /* taking one cost. */ 4651 newspi = min; 4652 4653 } else { 4654 4655 /* init SPI */ 4656 newspi = 0; 4657 4658 /* when requesting to allocate spi ranged */ 4659 while (count--) { 4660 /* generate pseudo-random SPI value ranged. */ 4661 newspi = min + (key_random() % (max - min + 1)); 4662 4663 if (key_checkspidup(saidx, newspi) == NULL) 4664 break; 4665 } 4666 4667 if (count == 0 || newspi == 0) { 4668 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4669 __func__)); 4670 return 0; 4671 } 4672 } 4673 4674 /* statistics */ 4675 keystat.getspi_count = 4676 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4677 4678 return newspi; 4679} 4680 4681/* 4682 * SADB_UPDATE processing 4683 * receive 4684 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4685 * key(AE), (identity(SD),) (sensitivity)> 4686 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4687 * and send 4688 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4689 * (identity(SD),) (sensitivity)> 4690 * to the ikmpd. 4691 * 4692 * m will always be freed. 4693 */ 4694static int 4695key_update(so, m, mhp) 4696 struct socket *so; 4697 struct mbuf *m; 4698 const struct sadb_msghdr *mhp; 4699{ 4700 INIT_VNET_IPSEC(curvnet); 4701 struct sadb_sa *sa0; 4702 struct sadb_address *src0, *dst0; 4703 struct secasindex saidx; 4704 struct secashead *sah; 4705 struct secasvar *sav; 4706 u_int16_t proto; 4707 u_int8_t mode; 4708 u_int32_t reqid; 4709 int error; 4710 4711 IPSEC_ASSERT(so != NULL, ("null socket")); 4712 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4713 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4714 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4715 4716 /* map satype to proto */ 4717 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4718 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4719 __func__)); 4720 return key_senderror(so, m, EINVAL); 4721 } 4722 4723 if (mhp->ext[SADB_EXT_SA] == NULL || 4724 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4725 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4726 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4727 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4728 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4729 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4730 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4731 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4732 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4733 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4734 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4735 __func__)); 4736 return key_senderror(so, m, EINVAL); 4737 } 4738 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4739 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4740 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4741 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4742 __func__)); 4743 return key_senderror(so, m, EINVAL); 4744 } 4745 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4746 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4747 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4748 } else { 4749 mode = IPSEC_MODE_ANY; 4750 reqid = 0; 4751 } 4752 /* XXX boundary checking for other extensions */ 4753 4754 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4755 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4756 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4757 4758 /* XXX boundary check against sa_len */ 4759 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4760 4761 /* get a SA header */ 4762 if ((sah = key_getsah(&saidx)) == NULL) { 4763 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4764 return key_senderror(so, m, ENOENT); 4765 } 4766 4767 /* set spidx if there */ 4768 /* XXX rewrite */ 4769 error = key_setident(sah, m, mhp); 4770 if (error) 4771 return key_senderror(so, m, error); 4772 4773 /* find a SA with sequence number. */ 4774#ifdef IPSEC_DOSEQCHECK 4775 if (mhp->msg->sadb_msg_seq != 0 4776 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4777 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4778 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4779 return key_senderror(so, m, ENOENT); 4780 } 4781#else 4782 SAHTREE_LOCK(); 4783 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4784 SAHTREE_UNLOCK(); 4785 if (sav == NULL) { 4786 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4787 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4788 return key_senderror(so, m, EINVAL); 4789 } 4790#endif 4791 4792 /* validity check */ 4793 if (sav->sah->saidx.proto != proto) { 4794 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4795 "(DB=%u param=%u)\n", __func__, 4796 sav->sah->saidx.proto, proto)); 4797 return key_senderror(so, m, EINVAL); 4798 } 4799#ifdef IPSEC_DOSEQCHECK 4800 if (sav->spi != sa0->sadb_sa_spi) { 4801 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4802 __func__, 4803 (u_int32_t)ntohl(sav->spi), 4804 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4805 return key_senderror(so, m, EINVAL); 4806 } 4807#endif 4808 if (sav->pid != mhp->msg->sadb_msg_pid) { 4809 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4810 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4811 return key_senderror(so, m, EINVAL); 4812 } 4813 4814 /* copy sav values */ 4815 error = key_setsaval(sav, m, mhp); 4816 if (error) { 4817 KEY_FREESAV(&sav); 4818 return key_senderror(so, m, error); 4819 } 4820 4821 /* check SA values to be mature. */ 4822 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4823 KEY_FREESAV(&sav); 4824 return key_senderror(so, m, 0); 4825 } 4826 4827 { 4828 struct mbuf *n; 4829 4830 /* set msg buf from mhp */ 4831 n = key_getmsgbuf_x1(m, mhp); 4832 if (n == NULL) { 4833 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4834 return key_senderror(so, m, ENOBUFS); 4835 } 4836 4837 m_freem(m); 4838 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4839 } 4840} 4841 4842/* 4843 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4844 * only called by key_update(). 4845 * OUT: 4846 * NULL : not found 4847 * others : found, pointer to a SA. 4848 */ 4849#ifdef IPSEC_DOSEQCHECK 4850static struct secasvar * 4851key_getsavbyseq(sah, seq) 4852 struct secashead *sah; 4853 u_int32_t seq; 4854{ 4855 struct secasvar *sav; 4856 u_int state; 4857 4858 state = SADB_SASTATE_LARVAL; 4859 4860 /* search SAD with sequence number ? */ 4861 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4862 4863 KEY_CHKSASTATE(state, sav->state, __func__); 4864 4865 if (sav->seq == seq) { 4866 sa_addref(sav); 4867 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4868 printf("DP %s cause refcnt++:%d SA:%p\n", 4869 __func__, sav->refcnt, sav)); 4870 return sav; 4871 } 4872 } 4873 4874 return NULL; 4875} 4876#endif 4877 4878/* 4879 * SADB_ADD processing 4880 * add an entry to SA database, when received 4881 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4882 * key(AE), (identity(SD),) (sensitivity)> 4883 * from the ikmpd, 4884 * and send 4885 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4886 * (identity(SD),) (sensitivity)> 4887 * to the ikmpd. 4888 * 4889 * IGNORE identity and sensitivity messages. 4890 * 4891 * m will always be freed. 4892 */ 4893static int 4894key_add(so, m, mhp) 4895 struct socket *so; 4896 struct mbuf *m; 4897 const struct sadb_msghdr *mhp; 4898{ 4899 INIT_VNET_IPSEC(curvnet); 4900 struct sadb_sa *sa0; 4901 struct sadb_address *src0, *dst0; 4902 struct secasindex saidx; 4903 struct secashead *newsah; 4904 struct secasvar *newsav; 4905 u_int16_t proto; 4906 u_int8_t mode; 4907 u_int32_t reqid; 4908 int error; 4909 4910 IPSEC_ASSERT(so != NULL, ("null socket")); 4911 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4912 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4913 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4914 4915 /* map satype to proto */ 4916 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4917 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4918 __func__)); 4919 return key_senderror(so, m, EINVAL); 4920 } 4921 4922 if (mhp->ext[SADB_EXT_SA] == NULL || 4923 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4924 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4925 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4926 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4927 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4928 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4929 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4930 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4931 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4932 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4933 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4934 __func__)); 4935 return key_senderror(so, m, EINVAL); 4936 } 4937 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4938 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4939 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4940 /* XXX need more */ 4941 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4942 __func__)); 4943 return key_senderror(so, m, EINVAL); 4944 } 4945 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4946 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4947 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4948 } else { 4949 mode = IPSEC_MODE_ANY; 4950 reqid = 0; 4951 } 4952 4953 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4954 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4955 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4956 4957 /* XXX boundary check against sa_len */ 4958 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4959 4960 /* get a SA header */ 4961 if ((newsah = key_getsah(&saidx)) == NULL) { 4962 /* create a new SA header */ 4963 if ((newsah = key_newsah(&saidx)) == NULL) { 4964 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4965 return key_senderror(so, m, ENOBUFS); 4966 } 4967 } 4968 4969 /* set spidx if there */ 4970 /* XXX rewrite */ 4971 error = key_setident(newsah, m, mhp); 4972 if (error) { 4973 return key_senderror(so, m, error); 4974 } 4975 4976 /* create new SA entry. */ 4977 /* We can create new SA only if SPI is differenct. */ 4978 SAHTREE_LOCK(); 4979 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4980 SAHTREE_UNLOCK(); 4981 if (newsav != NULL) { 4982 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4983 return key_senderror(so, m, EEXIST); 4984 } 4985 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4986 if (newsav == NULL) { 4987 return key_senderror(so, m, error); 4988 } 4989 4990 /* check SA values to be mature. */ 4991 if ((error = key_mature(newsav)) != 0) { 4992 KEY_FREESAV(&newsav); 4993 return key_senderror(so, m, error); 4994 } 4995 4996 /* 4997 * don't call key_freesav() here, as we would like to keep the SA 4998 * in the database on success. 4999 */ 5000 5001 { 5002 struct mbuf *n; 5003 5004 /* set msg buf from mhp */ 5005 n = key_getmsgbuf_x1(m, mhp); 5006 if (n == NULL) { 5007 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5008 return key_senderror(so, m, ENOBUFS); 5009 } 5010 5011 m_freem(m); 5012 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5013 } 5014} 5015 5016/* m is retained */ 5017static int 5018key_setident(sah, m, mhp) 5019 struct secashead *sah; 5020 struct mbuf *m; 5021 const struct sadb_msghdr *mhp; 5022{ 5023 INIT_VNET_IPSEC(curvnet); 5024 const struct sadb_ident *idsrc, *iddst; 5025 int idsrclen, iddstlen; 5026 5027 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5028 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5029 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5030 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5031 5032 /* don't make buffer if not there */ 5033 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5034 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5035 sah->idents = NULL; 5036 sah->identd = NULL; 5037 return 0; 5038 } 5039 5040 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5041 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5042 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5043 return EINVAL; 5044 } 5045 5046 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5047 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5048 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5049 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5050 5051 /* validity check */ 5052 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5053 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5054 return EINVAL; 5055 } 5056 5057 switch (idsrc->sadb_ident_type) { 5058 case SADB_IDENTTYPE_PREFIX: 5059 case SADB_IDENTTYPE_FQDN: 5060 case SADB_IDENTTYPE_USERFQDN: 5061 default: 5062 /* XXX do nothing */ 5063 sah->idents = NULL; 5064 sah->identd = NULL; 5065 return 0; 5066 } 5067 5068 /* make structure */ 5069 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5070 if (sah->idents == NULL) { 5071 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5072 return ENOBUFS; 5073 } 5074 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5075 if (sah->identd == NULL) { 5076 free(sah->idents, M_IPSEC_MISC); 5077 sah->idents = NULL; 5078 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5079 return ENOBUFS; 5080 } 5081 sah->idents->type = idsrc->sadb_ident_type; 5082 sah->idents->id = idsrc->sadb_ident_id; 5083 5084 sah->identd->type = iddst->sadb_ident_type; 5085 sah->identd->id = iddst->sadb_ident_id; 5086 5087 return 0; 5088} 5089 5090/* 5091 * m will not be freed on return. 5092 * it is caller's responsibility to free the result. 5093 */ 5094static struct mbuf * 5095key_getmsgbuf_x1(m, mhp) 5096 struct mbuf *m; 5097 const struct sadb_msghdr *mhp; 5098{ 5099 struct mbuf *n; 5100 5101 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5102 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5103 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5104 5105 /* create new sadb_msg to reply. */ 5106 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5107 SADB_EXT_SA, SADB_X_EXT_SA2, 5108 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5109 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5110 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5111 if (!n) 5112 return NULL; 5113 5114 if (n->m_len < sizeof(struct sadb_msg)) { 5115 n = m_pullup(n, sizeof(struct sadb_msg)); 5116 if (n == NULL) 5117 return NULL; 5118 } 5119 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5120 mtod(n, struct sadb_msg *)->sadb_msg_len = 5121 PFKEY_UNIT64(n->m_pkthdr.len); 5122 5123 return n; 5124} 5125 5126static int key_delete_all __P((struct socket *, struct mbuf *, 5127 const struct sadb_msghdr *, u_int16_t)); 5128 5129/* 5130 * SADB_DELETE processing 5131 * receive 5132 * <base, SA(*), address(SD)> 5133 * from the ikmpd, and set SADB_SASTATE_DEAD, 5134 * and send, 5135 * <base, SA(*), address(SD)> 5136 * to the ikmpd. 5137 * 5138 * m will always be freed. 5139 */ 5140static int 5141key_delete(so, m, mhp) 5142 struct socket *so; 5143 struct mbuf *m; 5144 const struct sadb_msghdr *mhp; 5145{ 5146 INIT_VNET_IPSEC(curvnet); 5147 struct sadb_sa *sa0; 5148 struct sadb_address *src0, *dst0; 5149 struct secasindex saidx; 5150 struct secashead *sah; 5151 struct secasvar *sav = NULL; 5152 u_int16_t proto; 5153 5154 IPSEC_ASSERT(so != NULL, ("null socket")); 5155 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5156 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5157 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5158 5159 /* map satype to proto */ 5160 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5161 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5162 __func__)); 5163 return key_senderror(so, m, EINVAL); 5164 } 5165 5166 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5167 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5168 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5169 __func__)); 5170 return key_senderror(so, m, EINVAL); 5171 } 5172 5173 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5174 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5175 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5176 __func__)); 5177 return key_senderror(so, m, EINVAL); 5178 } 5179 5180 if (mhp->ext[SADB_EXT_SA] == NULL) { 5181 /* 5182 * Caller wants us to delete all non-LARVAL SAs 5183 * that match the src/dst. This is used during 5184 * IKE INITIAL-CONTACT. 5185 */ 5186 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5187 return key_delete_all(so, m, mhp, proto); 5188 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5189 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5190 __func__)); 5191 return key_senderror(so, m, EINVAL); 5192 } 5193 5194 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5195 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5196 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5197 5198 /* XXX boundary check against sa_len */ 5199 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5200 5201 /* get a SA header */ 5202 SAHTREE_LOCK(); 5203 LIST_FOREACH(sah, &V_sahtree, chain) { 5204 if (sah->state == SADB_SASTATE_DEAD) 5205 continue; 5206 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5207 continue; 5208 5209 /* get a SA with SPI. */ 5210 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5211 if (sav) 5212 break; 5213 } 5214 if (sah == NULL) { 5215 SAHTREE_UNLOCK(); 5216 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5217 return key_senderror(so, m, ENOENT); 5218 } 5219 5220 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5221 SAHTREE_UNLOCK(); 5222 KEY_FREESAV(&sav); 5223 5224 { 5225 struct mbuf *n; 5226 struct sadb_msg *newmsg; 5227 5228 /* create new sadb_msg to reply. */ 5229 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5230 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5231 if (!n) 5232 return key_senderror(so, m, ENOBUFS); 5233 5234 if (n->m_len < sizeof(struct sadb_msg)) { 5235 n = m_pullup(n, sizeof(struct sadb_msg)); 5236 if (n == NULL) 5237 return key_senderror(so, m, ENOBUFS); 5238 } 5239 newmsg = mtod(n, struct sadb_msg *); 5240 newmsg->sadb_msg_errno = 0; 5241 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5242 5243 m_freem(m); 5244 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5245 } 5246} 5247 5248/* 5249 * delete all SAs for src/dst. Called from key_delete(). 5250 */ 5251static int 5252key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5253 u_int16_t proto) 5254{ 5255 INIT_VNET_IPSEC(curvnet); 5256 struct sadb_address *src0, *dst0; 5257 struct secasindex saidx; 5258 struct secashead *sah; 5259 struct secasvar *sav, *nextsav; 5260 u_int stateidx, state; 5261 5262 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5263 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5264 5265 /* XXX boundary check against sa_len */ 5266 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5267 5268 SAHTREE_LOCK(); 5269 LIST_FOREACH(sah, &V_sahtree, chain) { 5270 if (sah->state == SADB_SASTATE_DEAD) 5271 continue; 5272 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5273 continue; 5274 5275 /* Delete all non-LARVAL SAs. */ 5276 for (stateidx = 0; 5277 stateidx < _ARRAYLEN(saorder_state_alive); 5278 stateidx++) { 5279 state = saorder_state_alive[stateidx]; 5280 if (state == SADB_SASTATE_LARVAL) 5281 continue; 5282 for (sav = LIST_FIRST(&sah->savtree[state]); 5283 sav != NULL; sav = nextsav) { 5284 nextsav = LIST_NEXT(sav, chain); 5285 /* sanity check */ 5286 if (sav->state != state) { 5287 ipseclog((LOG_DEBUG, "%s: invalid " 5288 "sav->state (queue %d SA %d)\n", 5289 __func__, state, sav->state)); 5290 continue; 5291 } 5292 5293 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5294 KEY_FREESAV(&sav); 5295 } 5296 } 5297 } 5298 SAHTREE_UNLOCK(); 5299 { 5300 struct mbuf *n; 5301 struct sadb_msg *newmsg; 5302 5303 /* create new sadb_msg to reply. */ 5304 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5305 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5306 if (!n) 5307 return key_senderror(so, m, ENOBUFS); 5308 5309 if (n->m_len < sizeof(struct sadb_msg)) { 5310 n = m_pullup(n, sizeof(struct sadb_msg)); 5311 if (n == NULL) 5312 return key_senderror(so, m, ENOBUFS); 5313 } 5314 newmsg = mtod(n, struct sadb_msg *); 5315 newmsg->sadb_msg_errno = 0; 5316 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5317 5318 m_freem(m); 5319 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5320 } 5321} 5322 5323/* 5324 * SADB_GET processing 5325 * receive 5326 * <base, SA(*), address(SD)> 5327 * from the ikmpd, and get a SP and a SA to respond, 5328 * and send, 5329 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5330 * (identity(SD),) (sensitivity)> 5331 * to the ikmpd. 5332 * 5333 * m will always be freed. 5334 */ 5335static int 5336key_get(so, m, mhp) 5337 struct socket *so; 5338 struct mbuf *m; 5339 const struct sadb_msghdr *mhp; 5340{ 5341 INIT_VNET_IPSEC(curvnet); 5342 struct sadb_sa *sa0; 5343 struct sadb_address *src0, *dst0; 5344 struct secasindex saidx; 5345 struct secashead *sah; 5346 struct secasvar *sav = NULL; 5347 u_int16_t proto; 5348 5349 IPSEC_ASSERT(so != NULL, ("null socket")); 5350 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5351 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5352 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5353 5354 /* map satype to proto */ 5355 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5356 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5357 __func__)); 5358 return key_senderror(so, m, EINVAL); 5359 } 5360 5361 if (mhp->ext[SADB_EXT_SA] == NULL || 5362 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5363 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5364 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5365 __func__)); 5366 return key_senderror(so, m, EINVAL); 5367 } 5368 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5369 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5370 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5371 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5372 __func__)); 5373 return key_senderror(so, m, EINVAL); 5374 } 5375 5376 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5377 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5378 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5379 5380 /* XXX boundary check against sa_len */ 5381 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5382 5383 /* get a SA header */ 5384 SAHTREE_LOCK(); 5385 LIST_FOREACH(sah, &V_sahtree, chain) { 5386 if (sah->state == SADB_SASTATE_DEAD) 5387 continue; 5388 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5389 continue; 5390 5391 /* get a SA with SPI. */ 5392 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5393 if (sav) 5394 break; 5395 } 5396 SAHTREE_UNLOCK(); 5397 if (sah == NULL) { 5398 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5399 return key_senderror(so, m, ENOENT); 5400 } 5401 5402 { 5403 struct mbuf *n; 5404 u_int8_t satype; 5405 5406 /* map proto to satype */ 5407 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5408 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5409 __func__)); 5410 return key_senderror(so, m, EINVAL); 5411 } 5412 5413 /* create new sadb_msg to reply. */ 5414 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5415 mhp->msg->sadb_msg_pid); 5416 if (!n) 5417 return key_senderror(so, m, ENOBUFS); 5418 5419 m_freem(m); 5420 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5421 } 5422} 5423 5424/* XXX make it sysctl-configurable? */ 5425static void 5426key_getcomb_setlifetime(comb) 5427 struct sadb_comb *comb; 5428{ 5429 5430 comb->sadb_comb_soft_allocations = 1; 5431 comb->sadb_comb_hard_allocations = 1; 5432 comb->sadb_comb_soft_bytes = 0; 5433 comb->sadb_comb_hard_bytes = 0; 5434 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5435 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5436 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5437 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5438} 5439 5440/* 5441 * XXX reorder combinations by preference 5442 * XXX no idea if the user wants ESP authentication or not 5443 */ 5444static struct mbuf * 5445key_getcomb_esp() 5446{ 5447 INIT_VNET_IPSEC(curvnet); 5448 struct sadb_comb *comb; 5449 struct enc_xform *algo; 5450 struct mbuf *result = NULL, *m, *n; 5451 int encmin; 5452 int i, off, o; 5453 int totlen; 5454 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5455 5456 m = NULL; 5457 for (i = 1; i <= SADB_EALG_MAX; i++) { 5458 algo = esp_algorithm_lookup(i); 5459 if (algo == NULL) 5460 continue; 5461 5462 /* discard algorithms with key size smaller than system min */ 5463 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5464 continue; 5465 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5466 encmin = V_ipsec_esp_keymin; 5467 else 5468 encmin = _BITS(algo->minkey); 5469 5470 if (V_ipsec_esp_auth) 5471 m = key_getcomb_ah(); 5472 else { 5473 IPSEC_ASSERT(l <= MLEN, 5474 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5475 MGET(m, M_DONTWAIT, MT_DATA); 5476 if (m) { 5477 M_ALIGN(m, l); 5478 m->m_len = l; 5479 m->m_next = NULL; 5480 bzero(mtod(m, caddr_t), m->m_len); 5481 } 5482 } 5483 if (!m) 5484 goto fail; 5485 5486 totlen = 0; 5487 for (n = m; n; n = n->m_next) 5488 totlen += n->m_len; 5489 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5490 5491 for (off = 0; off < totlen; off += l) { 5492 n = m_pulldown(m, off, l, &o); 5493 if (!n) { 5494 /* m is already freed */ 5495 goto fail; 5496 } 5497 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5498 bzero(comb, sizeof(*comb)); 5499 key_getcomb_setlifetime(comb); 5500 comb->sadb_comb_encrypt = i; 5501 comb->sadb_comb_encrypt_minbits = encmin; 5502 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5503 } 5504 5505 if (!result) 5506 result = m; 5507 else 5508 m_cat(result, m); 5509 } 5510 5511 return result; 5512 5513 fail: 5514 if (result) 5515 m_freem(result); 5516 return NULL; 5517} 5518 5519static void 5520key_getsizes_ah( 5521 const struct auth_hash *ah, 5522 int alg, 5523 u_int16_t* min, 5524 u_int16_t* max) 5525{ 5526 INIT_VNET_IPSEC(curvnet); 5527 5528 *min = *max = ah->keysize; 5529 if (ah->keysize == 0) { 5530 /* 5531 * Transform takes arbitrary key size but algorithm 5532 * key size is restricted. Enforce this here. 5533 */ 5534 switch (alg) { 5535 case SADB_X_AALG_MD5: *min = *max = 16; break; 5536 case SADB_X_AALG_SHA: *min = *max = 20; break; 5537 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5538 default: 5539 DPRINTF(("%s: unknown AH algorithm %u\n", 5540 __func__, alg)); 5541 break; 5542 } 5543 } 5544} 5545 5546/* 5547 * XXX reorder combinations by preference 5548 */ 5549static struct mbuf * 5550key_getcomb_ah() 5551{ 5552 INIT_VNET_IPSEC(curvnet); 5553 struct sadb_comb *comb; 5554 struct auth_hash *algo; 5555 struct mbuf *m; 5556 u_int16_t minkeysize, maxkeysize; 5557 int i; 5558 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5559 5560 m = NULL; 5561 for (i = 1; i <= SADB_AALG_MAX; i++) { 5562#if 1 5563 /* we prefer HMAC algorithms, not old algorithms */ 5564 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5565 continue; 5566#endif 5567 algo = ah_algorithm_lookup(i); 5568 if (!algo) 5569 continue; 5570 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5571 /* discard algorithms with key size smaller than system min */ 5572 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5573 continue; 5574 5575 if (!m) { 5576 IPSEC_ASSERT(l <= MLEN, 5577 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5578 MGET(m, M_DONTWAIT, MT_DATA); 5579 if (m) { 5580 M_ALIGN(m, l); 5581 m->m_len = l; 5582 m->m_next = NULL; 5583 } 5584 } else 5585 M_PREPEND(m, l, M_DONTWAIT); 5586 if (!m) 5587 return NULL; 5588 5589 comb = mtod(m, struct sadb_comb *); 5590 bzero(comb, sizeof(*comb)); 5591 key_getcomb_setlifetime(comb); 5592 comb->sadb_comb_auth = i; 5593 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5594 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5595 } 5596 5597 return m; 5598} 5599 5600/* 5601 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5602 * XXX reorder combinations by preference 5603 */ 5604static struct mbuf * 5605key_getcomb_ipcomp() 5606{ 5607 struct sadb_comb *comb; 5608 struct comp_algo *algo; 5609 struct mbuf *m; 5610 int i; 5611 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5612 5613 m = NULL; 5614 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5615 algo = ipcomp_algorithm_lookup(i); 5616 if (!algo) 5617 continue; 5618 5619 if (!m) { 5620 IPSEC_ASSERT(l <= MLEN, 5621 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5622 MGET(m, M_DONTWAIT, MT_DATA); 5623 if (m) { 5624 M_ALIGN(m, l); 5625 m->m_len = l; 5626 m->m_next = NULL; 5627 } 5628 } else 5629 M_PREPEND(m, l, M_DONTWAIT); 5630 if (!m) 5631 return NULL; 5632 5633 comb = mtod(m, struct sadb_comb *); 5634 bzero(comb, sizeof(*comb)); 5635 key_getcomb_setlifetime(comb); 5636 comb->sadb_comb_encrypt = i; 5637 /* what should we set into sadb_comb_*_{min,max}bits? */ 5638 } 5639 5640 return m; 5641} 5642 5643/* 5644 * XXX no way to pass mode (transport/tunnel) to userland 5645 * XXX replay checking? 5646 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5647 */ 5648static struct mbuf * 5649key_getprop(saidx) 5650 const struct secasindex *saidx; 5651{ 5652 struct sadb_prop *prop; 5653 struct mbuf *m, *n; 5654 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5655 int totlen; 5656 5657 switch (saidx->proto) { 5658 case IPPROTO_ESP: 5659 m = key_getcomb_esp(); 5660 break; 5661 case IPPROTO_AH: 5662 m = key_getcomb_ah(); 5663 break; 5664 case IPPROTO_IPCOMP: 5665 m = key_getcomb_ipcomp(); 5666 break; 5667 default: 5668 return NULL; 5669 } 5670 5671 if (!m) 5672 return NULL; 5673 M_PREPEND(m, l, M_DONTWAIT); 5674 if (!m) 5675 return NULL; 5676 5677 totlen = 0; 5678 for (n = m; n; n = n->m_next) 5679 totlen += n->m_len; 5680 5681 prop = mtod(m, struct sadb_prop *); 5682 bzero(prop, sizeof(*prop)); 5683 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5684 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5685 prop->sadb_prop_replay = 32; /* XXX */ 5686 5687 return m; 5688} 5689 5690/* 5691 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5692 * send 5693 * <base, SA, address(SD), (address(P)), x_policy, 5694 * (identity(SD),) (sensitivity,) proposal> 5695 * to KMD, and expect to receive 5696 * <base> with SADB_ACQUIRE if error occured, 5697 * or 5698 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5699 * from KMD by PF_KEY. 5700 * 5701 * XXX x_policy is outside of RFC2367 (KAME extension). 5702 * XXX sensitivity is not supported. 5703 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5704 * see comment for key_getcomb_ipcomp(). 5705 * 5706 * OUT: 5707 * 0 : succeed 5708 * others: error number 5709 */ 5710static int 5711key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5712{ 5713 INIT_VNET_IPSEC(curvnet); 5714 struct mbuf *result = NULL, *m; 5715 struct secacq *newacq; 5716 u_int8_t satype; 5717 int error = -1; 5718 u_int32_t seq; 5719 5720 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5721 satype = key_proto2satype(saidx->proto); 5722 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5723 5724 /* 5725 * We never do anything about acquirng SA. There is anather 5726 * solution that kernel blocks to send SADB_ACQUIRE message until 5727 * getting something message from IKEd. In later case, to be 5728 * managed with ACQUIRING list. 5729 */ 5730 /* Get an entry to check whether sending message or not. */ 5731 if ((newacq = key_getacq(saidx)) != NULL) { 5732 if (V_key_blockacq_count < newacq->count) { 5733 /* reset counter and do send message. */ 5734 newacq->count = 0; 5735 } else { 5736 /* increment counter and do nothing. */ 5737 newacq->count++; 5738 return 0; 5739 } 5740 } else { 5741 /* make new entry for blocking to send SADB_ACQUIRE. */ 5742 if ((newacq = key_newacq(saidx)) == NULL) 5743 return ENOBUFS; 5744 } 5745 5746 5747 seq = newacq->seq; 5748 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5749 if (!m) { 5750 error = ENOBUFS; 5751 goto fail; 5752 } 5753 result = m; 5754 5755 /* set sadb_address for saidx's. */ 5756 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5757 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5758 if (!m) { 5759 error = ENOBUFS; 5760 goto fail; 5761 } 5762 m_cat(result, m); 5763 5764 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5765 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5766 if (!m) { 5767 error = ENOBUFS; 5768 goto fail; 5769 } 5770 m_cat(result, m); 5771 5772 /* XXX proxy address (optional) */ 5773 5774 /* set sadb_x_policy */ 5775 if (sp) { 5776 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5777 if (!m) { 5778 error = ENOBUFS; 5779 goto fail; 5780 } 5781 m_cat(result, m); 5782 } 5783 5784 /* XXX identity (optional) */ 5785#if 0 5786 if (idexttype && fqdn) { 5787 /* create identity extension (FQDN) */ 5788 struct sadb_ident *id; 5789 int fqdnlen; 5790 5791 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5792 id = (struct sadb_ident *)p; 5793 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5794 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5795 id->sadb_ident_exttype = idexttype; 5796 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5797 bcopy(fqdn, id + 1, fqdnlen); 5798 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5799 } 5800 5801 if (idexttype) { 5802 /* create identity extension (USERFQDN) */ 5803 struct sadb_ident *id; 5804 int userfqdnlen; 5805 5806 if (userfqdn) { 5807 /* +1 for terminating-NUL */ 5808 userfqdnlen = strlen(userfqdn) + 1; 5809 } else 5810 userfqdnlen = 0; 5811 id = (struct sadb_ident *)p; 5812 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5813 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5814 id->sadb_ident_exttype = idexttype; 5815 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5816 /* XXX is it correct? */ 5817 if (curproc && curproc->p_cred) 5818 id->sadb_ident_id = curproc->p_cred->p_ruid; 5819 if (userfqdn && userfqdnlen) 5820 bcopy(userfqdn, id + 1, userfqdnlen); 5821 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5822 } 5823#endif 5824 5825 /* XXX sensitivity (optional) */ 5826 5827 /* create proposal/combination extension */ 5828 m = key_getprop(saidx); 5829#if 0 5830 /* 5831 * spec conformant: always attach proposal/combination extension, 5832 * the problem is that we have no way to attach it for ipcomp, 5833 * due to the way sadb_comb is declared in RFC2367. 5834 */ 5835 if (!m) { 5836 error = ENOBUFS; 5837 goto fail; 5838 } 5839 m_cat(result, m); 5840#else 5841 /* 5842 * outside of spec; make proposal/combination extension optional. 5843 */ 5844 if (m) 5845 m_cat(result, m); 5846#endif 5847 5848 if ((result->m_flags & M_PKTHDR) == 0) { 5849 error = EINVAL; 5850 goto fail; 5851 } 5852 5853 if (result->m_len < sizeof(struct sadb_msg)) { 5854 result = m_pullup(result, sizeof(struct sadb_msg)); 5855 if (result == NULL) { 5856 error = ENOBUFS; 5857 goto fail; 5858 } 5859 } 5860 5861 result->m_pkthdr.len = 0; 5862 for (m = result; m; m = m->m_next) 5863 result->m_pkthdr.len += m->m_len; 5864 5865 mtod(result, struct sadb_msg *)->sadb_msg_len = 5866 PFKEY_UNIT64(result->m_pkthdr.len); 5867 5868 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5869 5870 fail: 5871 if (result) 5872 m_freem(result); 5873 return error; 5874} 5875 5876static struct secacq * 5877key_newacq(const struct secasindex *saidx) 5878{ 5879 INIT_VNET_IPSEC(curvnet); 5880 struct secacq *newacq; 5881 5882 /* get new entry */ 5883 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5884 if (newacq == NULL) { 5885 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5886 return NULL; 5887 } 5888 5889 /* copy secindex */ 5890 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5891 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5892 newacq->created = time_second; 5893 newacq->count = 0; 5894 5895 /* add to acqtree */ 5896 ACQ_LOCK(); 5897 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5898 ACQ_UNLOCK(); 5899 5900 return newacq; 5901} 5902 5903static struct secacq * 5904key_getacq(const struct secasindex *saidx) 5905{ 5906 INIT_VNET_IPSEC(curvnet); 5907 struct secacq *acq; 5908 5909 ACQ_LOCK(); 5910 LIST_FOREACH(acq, &V_acqtree, chain) { 5911 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5912 break; 5913 } 5914 ACQ_UNLOCK(); 5915 5916 return acq; 5917} 5918 5919static struct secacq * 5920key_getacqbyseq(seq) 5921 u_int32_t seq; 5922{ 5923 INIT_VNET_IPSEC(curvnet); 5924 struct secacq *acq; 5925 5926 ACQ_LOCK(); 5927 LIST_FOREACH(acq, &V_acqtree, chain) { 5928 if (acq->seq == seq) 5929 break; 5930 } 5931 ACQ_UNLOCK(); 5932 5933 return acq; 5934} 5935 5936static struct secspacq * 5937key_newspacq(spidx) 5938 struct secpolicyindex *spidx; 5939{ 5940 INIT_VNET_IPSEC(curvnet); 5941 struct secspacq *acq; 5942 5943 /* get new entry */ 5944 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5945 if (acq == NULL) { 5946 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5947 return NULL; 5948 } 5949 5950 /* copy secindex */ 5951 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5952 acq->created = time_second; 5953 acq->count = 0; 5954 5955 /* add to spacqtree */ 5956 SPACQ_LOCK(); 5957 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5958 SPACQ_UNLOCK(); 5959 5960 return acq; 5961} 5962 5963static struct secspacq * 5964key_getspacq(spidx) 5965 struct secpolicyindex *spidx; 5966{ 5967 INIT_VNET_IPSEC(curvnet); 5968 struct secspacq *acq; 5969 5970 SPACQ_LOCK(); 5971 LIST_FOREACH(acq, &V_spacqtree, chain) { 5972 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5973 /* NB: return holding spacq_lock */ 5974 return acq; 5975 } 5976 } 5977 SPACQ_UNLOCK(); 5978 5979 return NULL; 5980} 5981 5982/* 5983 * SADB_ACQUIRE processing, 5984 * in first situation, is receiving 5985 * <base> 5986 * from the ikmpd, and clear sequence of its secasvar entry. 5987 * 5988 * In second situation, is receiving 5989 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5990 * from a user land process, and return 5991 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5992 * to the socket. 5993 * 5994 * m will always be freed. 5995 */ 5996static int 5997key_acquire2(so, m, mhp) 5998 struct socket *so; 5999 struct mbuf *m; 6000 const struct sadb_msghdr *mhp; 6001{ 6002 INIT_VNET_IPSEC(curvnet); 6003 const struct sadb_address *src0, *dst0; 6004 struct secasindex saidx; 6005 struct secashead *sah; 6006 u_int16_t proto; 6007 int error; 6008 6009 IPSEC_ASSERT(so != NULL, ("null socket")); 6010 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6011 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6012 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6013 6014 /* 6015 * Error message from KMd. 6016 * We assume that if error was occured in IKEd, the length of PFKEY 6017 * message is equal to the size of sadb_msg structure. 6018 * We do not raise error even if error occured in this function. 6019 */ 6020 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6021 struct secacq *acq; 6022 6023 /* check sequence number */ 6024 if (mhp->msg->sadb_msg_seq == 0) { 6025 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6026 "number.\n", __func__)); 6027 m_freem(m); 6028 return 0; 6029 } 6030 6031 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6032 /* 6033 * the specified larval SA is already gone, or we got 6034 * a bogus sequence number. we can silently ignore it. 6035 */ 6036 m_freem(m); 6037 return 0; 6038 } 6039 6040 /* reset acq counter in order to deletion by timehander. */ 6041 acq->created = time_second; 6042 acq->count = 0; 6043 m_freem(m); 6044 return 0; 6045 } 6046 6047 /* 6048 * This message is from user land. 6049 */ 6050 6051 /* map satype to proto */ 6052 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6053 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6054 __func__)); 6055 return key_senderror(so, m, EINVAL); 6056 } 6057 6058 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6059 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6060 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6061 /* error */ 6062 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6063 __func__)); 6064 return key_senderror(so, m, EINVAL); 6065 } 6066 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6067 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6068 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6069 /* error */ 6070 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6071 __func__)); 6072 return key_senderror(so, m, EINVAL); 6073 } 6074 6075 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6076 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6077 6078 /* XXX boundary check against sa_len */ 6079 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6080 6081 /* get a SA index */ 6082 SAHTREE_LOCK(); 6083 LIST_FOREACH(sah, &V_sahtree, chain) { 6084 if (sah->state == SADB_SASTATE_DEAD) 6085 continue; 6086 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6087 break; 6088 } 6089 SAHTREE_UNLOCK(); 6090 if (sah != NULL) { 6091 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6092 return key_senderror(so, m, EEXIST); 6093 } 6094 6095 error = key_acquire(&saidx, NULL); 6096 if (error != 0) { 6097 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6098 __func__, mhp->msg->sadb_msg_errno)); 6099 return key_senderror(so, m, error); 6100 } 6101 6102 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6103} 6104 6105/* 6106 * SADB_REGISTER processing. 6107 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6108 * receive 6109 * <base> 6110 * from the ikmpd, and register a socket to send PF_KEY messages, 6111 * and send 6112 * <base, supported> 6113 * to KMD by PF_KEY. 6114 * If socket is detached, must free from regnode. 6115 * 6116 * m will always be freed. 6117 */ 6118static int 6119key_register(so, m, mhp) 6120 struct socket *so; 6121 struct mbuf *m; 6122 const struct sadb_msghdr *mhp; 6123{ 6124 INIT_VNET_IPSEC(curvnet); 6125 struct secreg *reg, *newreg = 0; 6126 6127 IPSEC_ASSERT(so != NULL, ("null socket")); 6128 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6129 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6130 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6131 6132 /* check for invalid register message */ 6133 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6134 return key_senderror(so, m, EINVAL); 6135 6136 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6137 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6138 goto setmsg; 6139 6140 /* check whether existing or not */ 6141 REGTREE_LOCK(); 6142 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6143 if (reg->so == so) { 6144 REGTREE_UNLOCK(); 6145 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6146 __func__)); 6147 return key_senderror(so, m, EEXIST); 6148 } 6149 } 6150 6151 /* create regnode */ 6152 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6153 if (newreg == NULL) { 6154 REGTREE_UNLOCK(); 6155 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6156 return key_senderror(so, m, ENOBUFS); 6157 } 6158 6159 newreg->so = so; 6160 ((struct keycb *)sotorawcb(so))->kp_registered++; 6161 6162 /* add regnode to regtree. */ 6163 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6164 REGTREE_UNLOCK(); 6165 6166 setmsg: 6167 { 6168 struct mbuf *n; 6169 struct sadb_msg *newmsg; 6170 struct sadb_supported *sup; 6171 u_int len, alen, elen; 6172 int off; 6173 int i; 6174 struct sadb_alg *alg; 6175 6176 /* create new sadb_msg to reply. */ 6177 alen = 0; 6178 for (i = 1; i <= SADB_AALG_MAX; i++) { 6179 if (ah_algorithm_lookup(i)) 6180 alen += sizeof(struct sadb_alg); 6181 } 6182 if (alen) 6183 alen += sizeof(struct sadb_supported); 6184 elen = 0; 6185 for (i = 1; i <= SADB_EALG_MAX; i++) { 6186 if (esp_algorithm_lookup(i)) 6187 elen += sizeof(struct sadb_alg); 6188 } 6189 if (elen) 6190 elen += sizeof(struct sadb_supported); 6191 6192 len = sizeof(struct sadb_msg) + alen + elen; 6193 6194 if (len > MCLBYTES) 6195 return key_senderror(so, m, ENOBUFS); 6196 6197 MGETHDR(n, M_DONTWAIT, MT_DATA); 6198 if (len > MHLEN) { 6199 MCLGET(n, M_DONTWAIT); 6200 if ((n->m_flags & M_EXT) == 0) { 6201 m_freem(n); 6202 n = NULL; 6203 } 6204 } 6205 if (!n) 6206 return key_senderror(so, m, ENOBUFS); 6207 6208 n->m_pkthdr.len = n->m_len = len; 6209 n->m_next = NULL; 6210 off = 0; 6211 6212 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6213 newmsg = mtod(n, struct sadb_msg *); 6214 newmsg->sadb_msg_errno = 0; 6215 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6216 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6217 6218 /* for authentication algorithm */ 6219 if (alen) { 6220 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6221 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6222 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6223 off += PFKEY_ALIGN8(sizeof(*sup)); 6224 6225 for (i = 1; i <= SADB_AALG_MAX; i++) { 6226 struct auth_hash *aalgo; 6227 u_int16_t minkeysize, maxkeysize; 6228 6229 aalgo = ah_algorithm_lookup(i); 6230 if (!aalgo) 6231 continue; 6232 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6233 alg->sadb_alg_id = i; 6234 alg->sadb_alg_ivlen = 0; 6235 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6236 alg->sadb_alg_minbits = _BITS(minkeysize); 6237 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6238 off += PFKEY_ALIGN8(sizeof(*alg)); 6239 } 6240 } 6241 6242 /* for encryption algorithm */ 6243 if (elen) { 6244 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6245 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6246 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6247 off += PFKEY_ALIGN8(sizeof(*sup)); 6248 6249 for (i = 1; i <= SADB_EALG_MAX; i++) { 6250 struct enc_xform *ealgo; 6251 6252 ealgo = esp_algorithm_lookup(i); 6253 if (!ealgo) 6254 continue; 6255 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6256 alg->sadb_alg_id = i; 6257 alg->sadb_alg_ivlen = ealgo->blocksize; 6258 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6259 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6260 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6261 } 6262 } 6263 6264 IPSEC_ASSERT(off == len, 6265 ("length assumption failed (off %u len %u)", off, len)); 6266 6267 m_freem(m); 6268 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6269 } 6270} 6271 6272/* 6273 * free secreg entry registered. 6274 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6275 */ 6276void 6277key_freereg(struct socket *so) 6278{ 6279 INIT_VNET_IPSEC(curvnet); 6280 struct secreg *reg; 6281 int i; 6282 6283 IPSEC_ASSERT(so != NULL, ("NULL so")); 6284 6285 /* 6286 * check whether existing or not. 6287 * check all type of SA, because there is a potential that 6288 * one socket is registered to multiple type of SA. 6289 */ 6290 REGTREE_LOCK(); 6291 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6292 LIST_FOREACH(reg, &V_regtree[i], chain) { 6293 if (reg->so == so && __LIST_CHAINED(reg)) { 6294 LIST_REMOVE(reg, chain); 6295 free(reg, M_IPSEC_SAR); 6296 break; 6297 } 6298 } 6299 } 6300 REGTREE_UNLOCK(); 6301} 6302 6303/* 6304 * SADB_EXPIRE processing 6305 * send 6306 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6307 * to KMD by PF_KEY. 6308 * NOTE: We send only soft lifetime extension. 6309 * 6310 * OUT: 0 : succeed 6311 * others : error number 6312 */ 6313static int 6314key_expire(struct secasvar *sav) 6315{ 6316 int s; 6317 int satype; 6318 struct mbuf *result = NULL, *m; 6319 int len; 6320 int error = -1; 6321 struct sadb_lifetime *lt; 6322 6323 /* XXX: Why do we lock ? */ 6324 s = splnet(); /*called from softclock()*/ 6325 6326 IPSEC_ASSERT (sav != NULL, ("null sav")); 6327 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6328 6329 /* set msg header */ 6330 satype = key_proto2satype(sav->sah->saidx.proto); 6331 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6332 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6333 if (!m) { 6334 error = ENOBUFS; 6335 goto fail; 6336 } 6337 result = m; 6338 6339 /* create SA extension */ 6340 m = key_setsadbsa(sav); 6341 if (!m) { 6342 error = ENOBUFS; 6343 goto fail; 6344 } 6345 m_cat(result, m); 6346 6347 /* create SA extension */ 6348 m = key_setsadbxsa2(sav->sah->saidx.mode, 6349 sav->replay ? sav->replay->count : 0, 6350 sav->sah->saidx.reqid); 6351 if (!m) { 6352 error = ENOBUFS; 6353 goto fail; 6354 } 6355 m_cat(result, m); 6356 6357 /* create lifetime extension (current and soft) */ 6358 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6359 m = key_alloc_mbuf(len); 6360 if (!m || m->m_next) { /*XXX*/ 6361 if (m) 6362 m_freem(m); 6363 error = ENOBUFS; 6364 goto fail; 6365 } 6366 bzero(mtod(m, caddr_t), len); 6367 lt = mtod(m, struct sadb_lifetime *); 6368 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6369 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6370 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6371 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6372 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6373 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6374 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6375 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6376 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6377 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6378 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6379 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6380 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6381 m_cat(result, m); 6382 6383 /* set sadb_address for source */ 6384 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6385 &sav->sah->saidx.src.sa, 6386 FULLMASK, IPSEC_ULPROTO_ANY); 6387 if (!m) { 6388 error = ENOBUFS; 6389 goto fail; 6390 } 6391 m_cat(result, m); 6392 6393 /* set sadb_address for destination */ 6394 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6395 &sav->sah->saidx.dst.sa, 6396 FULLMASK, IPSEC_ULPROTO_ANY); 6397 if (!m) { 6398 error = ENOBUFS; 6399 goto fail; 6400 } 6401 m_cat(result, m); 6402 6403 if ((result->m_flags & M_PKTHDR) == 0) { 6404 error = EINVAL; 6405 goto fail; 6406 } 6407 6408 if (result->m_len < sizeof(struct sadb_msg)) { 6409 result = m_pullup(result, sizeof(struct sadb_msg)); 6410 if (result == NULL) { 6411 error = ENOBUFS; 6412 goto fail; 6413 } 6414 } 6415 6416 result->m_pkthdr.len = 0; 6417 for (m = result; m; m = m->m_next) 6418 result->m_pkthdr.len += m->m_len; 6419 6420 mtod(result, struct sadb_msg *)->sadb_msg_len = 6421 PFKEY_UNIT64(result->m_pkthdr.len); 6422 6423 splx(s); 6424 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6425 6426 fail: 6427 if (result) 6428 m_freem(result); 6429 splx(s); 6430 return error; 6431} 6432 6433/* 6434 * SADB_FLUSH processing 6435 * receive 6436 * <base> 6437 * from the ikmpd, and free all entries in secastree. 6438 * and send, 6439 * <base> 6440 * to the ikmpd. 6441 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6442 * 6443 * m will always be freed. 6444 */ 6445static int 6446key_flush(so, m, mhp) 6447 struct socket *so; 6448 struct mbuf *m; 6449 const struct sadb_msghdr *mhp; 6450{ 6451 INIT_VNET_IPSEC(curvnet); 6452 struct sadb_msg *newmsg; 6453 struct secashead *sah, *nextsah; 6454 struct secasvar *sav, *nextsav; 6455 u_int16_t proto; 6456 u_int8_t state; 6457 u_int stateidx; 6458 6459 IPSEC_ASSERT(so != NULL, ("null socket")); 6460 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6461 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6462 6463 /* map satype to proto */ 6464 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6465 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6466 __func__)); 6467 return key_senderror(so, m, EINVAL); 6468 } 6469 6470 /* no SATYPE specified, i.e. flushing all SA. */ 6471 SAHTREE_LOCK(); 6472 for (sah = LIST_FIRST(&V_sahtree); 6473 sah != NULL; 6474 sah = nextsah) { 6475 nextsah = LIST_NEXT(sah, chain); 6476 6477 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6478 && proto != sah->saidx.proto) 6479 continue; 6480 6481 for (stateidx = 0; 6482 stateidx < _ARRAYLEN(saorder_state_alive); 6483 stateidx++) { 6484 state = saorder_state_any[stateidx]; 6485 for (sav = LIST_FIRST(&sah->savtree[state]); 6486 sav != NULL; 6487 sav = nextsav) { 6488 6489 nextsav = LIST_NEXT(sav, chain); 6490 6491 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6492 KEY_FREESAV(&sav); 6493 } 6494 } 6495 6496 sah->state = SADB_SASTATE_DEAD; 6497 } 6498 SAHTREE_UNLOCK(); 6499 6500 if (m->m_len < sizeof(struct sadb_msg) || 6501 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6502 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6503 return key_senderror(so, m, ENOBUFS); 6504 } 6505 6506 if (m->m_next) 6507 m_freem(m->m_next); 6508 m->m_next = NULL; 6509 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6510 newmsg = mtod(m, struct sadb_msg *); 6511 newmsg->sadb_msg_errno = 0; 6512 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6513 6514 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6515} 6516 6517/* 6518 * SADB_DUMP processing 6519 * dump all entries including status of DEAD in SAD. 6520 * receive 6521 * <base> 6522 * from the ikmpd, and dump all secasvar leaves 6523 * and send, 6524 * <base> ..... 6525 * to the ikmpd. 6526 * 6527 * m will always be freed. 6528 */ 6529static int 6530key_dump(so, m, mhp) 6531 struct socket *so; 6532 struct mbuf *m; 6533 const struct sadb_msghdr *mhp; 6534{ 6535 INIT_VNET_IPSEC(curvnet); 6536 struct secashead *sah; 6537 struct secasvar *sav; 6538 u_int16_t proto; 6539 u_int stateidx; 6540 u_int8_t satype; 6541 u_int8_t state; 6542 int cnt; 6543 struct sadb_msg *newmsg; 6544 struct mbuf *n; 6545 6546 IPSEC_ASSERT(so != NULL, ("null socket")); 6547 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6548 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6549 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6550 6551 /* map satype to proto */ 6552 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6553 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6554 __func__)); 6555 return key_senderror(so, m, EINVAL); 6556 } 6557 6558 /* count sav entries to be sent to the userland. */ 6559 cnt = 0; 6560 SAHTREE_LOCK(); 6561 LIST_FOREACH(sah, &V_sahtree, chain) { 6562 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6563 && proto != sah->saidx.proto) 6564 continue; 6565 6566 for (stateidx = 0; 6567 stateidx < _ARRAYLEN(saorder_state_any); 6568 stateidx++) { 6569 state = saorder_state_any[stateidx]; 6570 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6571 cnt++; 6572 } 6573 } 6574 } 6575 6576 if (cnt == 0) { 6577 SAHTREE_UNLOCK(); 6578 return key_senderror(so, m, ENOENT); 6579 } 6580 6581 /* send this to the userland, one at a time. */ 6582 newmsg = NULL; 6583 LIST_FOREACH(sah, &V_sahtree, chain) { 6584 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6585 && proto != sah->saidx.proto) 6586 continue; 6587 6588 /* map proto to satype */ 6589 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6590 SAHTREE_UNLOCK(); 6591 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6592 "SAD.\n", __func__)); 6593 return key_senderror(so, m, EINVAL); 6594 } 6595 6596 for (stateidx = 0; 6597 stateidx < _ARRAYLEN(saorder_state_any); 6598 stateidx++) { 6599 state = saorder_state_any[stateidx]; 6600 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6601 n = key_setdumpsa(sav, SADB_DUMP, satype, 6602 --cnt, mhp->msg->sadb_msg_pid); 6603 if (!n) { 6604 SAHTREE_UNLOCK(); 6605 return key_senderror(so, m, ENOBUFS); 6606 } 6607 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6608 } 6609 } 6610 } 6611 SAHTREE_UNLOCK(); 6612 6613 m_freem(m); 6614 return 0; 6615} 6616 6617/* 6618 * SADB_X_PROMISC processing 6619 * 6620 * m will always be freed. 6621 */ 6622static int 6623key_promisc(so, m, mhp) 6624 struct socket *so; 6625 struct mbuf *m; 6626 const struct sadb_msghdr *mhp; 6627{ 6628 int olen; 6629 6630 IPSEC_ASSERT(so != NULL, ("null socket")); 6631 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6632 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6633 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6634 6635 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6636 6637 if (olen < sizeof(struct sadb_msg)) { 6638#if 1 6639 return key_senderror(so, m, EINVAL); 6640#else 6641 m_freem(m); 6642 return 0; 6643#endif 6644 } else if (olen == sizeof(struct sadb_msg)) { 6645 /* enable/disable promisc mode */ 6646 struct keycb *kp; 6647 6648 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6649 return key_senderror(so, m, EINVAL); 6650 mhp->msg->sadb_msg_errno = 0; 6651 switch (mhp->msg->sadb_msg_satype) { 6652 case 0: 6653 case 1: 6654 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6655 break; 6656 default: 6657 return key_senderror(so, m, EINVAL); 6658 } 6659 6660 /* send the original message back to everyone */ 6661 mhp->msg->sadb_msg_errno = 0; 6662 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6663 } else { 6664 /* send packet as is */ 6665 6666 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6667 6668 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6669 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6670 } 6671} 6672 6673static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6674 const struct sadb_msghdr *)) = { 6675 NULL, /* SADB_RESERVED */ 6676 key_getspi, /* SADB_GETSPI */ 6677 key_update, /* SADB_UPDATE */ 6678 key_add, /* SADB_ADD */ 6679 key_delete, /* SADB_DELETE */ 6680 key_get, /* SADB_GET */ 6681 key_acquire2, /* SADB_ACQUIRE */ 6682 key_register, /* SADB_REGISTER */ 6683 NULL, /* SADB_EXPIRE */ 6684 key_flush, /* SADB_FLUSH */ 6685 key_dump, /* SADB_DUMP */ 6686 key_promisc, /* SADB_X_PROMISC */ 6687 NULL, /* SADB_X_PCHANGE */ 6688 key_spdadd, /* SADB_X_SPDUPDATE */ 6689 key_spdadd, /* SADB_X_SPDADD */ 6690 key_spddelete, /* SADB_X_SPDDELETE */ 6691 key_spdget, /* SADB_X_SPDGET */ 6692 NULL, /* SADB_X_SPDACQUIRE */ 6693 key_spddump, /* SADB_X_SPDDUMP */ 6694 key_spdflush, /* SADB_X_SPDFLUSH */ 6695 key_spdadd, /* SADB_X_SPDSETIDX */ 6696 NULL, /* SADB_X_SPDEXPIRE */ 6697 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6698}; 6699 6700/* 6701 * parse sadb_msg buffer to process PFKEYv2, 6702 * and create a data to response if needed. 6703 * I think to be dealed with mbuf directly. 6704 * IN: 6705 * msgp : pointer to pointer to a received buffer pulluped. 6706 * This is rewrited to response. 6707 * so : pointer to socket. 6708 * OUT: 6709 * length for buffer to send to user process. 6710 */ 6711int 6712key_parse(m, so) 6713 struct mbuf *m; 6714 struct socket *so; 6715{ 6716 INIT_VNET_IPSEC(curvnet); 6717 struct sadb_msg *msg; 6718 struct sadb_msghdr mh; 6719 u_int orglen; 6720 int error; 6721 int target; 6722 6723 IPSEC_ASSERT(so != NULL, ("null socket")); 6724 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6725 6726#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6727 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6728 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6729 kdebug_sadb(msg)); 6730#endif 6731 6732 if (m->m_len < sizeof(struct sadb_msg)) { 6733 m = m_pullup(m, sizeof(struct sadb_msg)); 6734 if (!m) 6735 return ENOBUFS; 6736 } 6737 msg = mtod(m, struct sadb_msg *); 6738 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6739 target = KEY_SENDUP_ONE; 6740 6741 if ((m->m_flags & M_PKTHDR) == 0 || 6742 m->m_pkthdr.len != m->m_pkthdr.len) { 6743 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6744 V_pfkeystat.out_invlen++; 6745 error = EINVAL; 6746 goto senderror; 6747 } 6748 6749 if (msg->sadb_msg_version != PF_KEY_V2) { 6750 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6751 __func__, msg->sadb_msg_version)); 6752 V_pfkeystat.out_invver++; 6753 error = EINVAL; 6754 goto senderror; 6755 } 6756 6757 if (msg->sadb_msg_type > SADB_MAX) { 6758 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6759 __func__, msg->sadb_msg_type)); 6760 V_pfkeystat.out_invmsgtype++; 6761 error = EINVAL; 6762 goto senderror; 6763 } 6764 6765 /* for old-fashioned code - should be nuked */ 6766 if (m->m_pkthdr.len > MCLBYTES) { 6767 m_freem(m); 6768 return ENOBUFS; 6769 } 6770 if (m->m_next) { 6771 struct mbuf *n; 6772 6773 MGETHDR(n, M_DONTWAIT, MT_DATA); 6774 if (n && m->m_pkthdr.len > MHLEN) { 6775 MCLGET(n, M_DONTWAIT); 6776 if ((n->m_flags & M_EXT) == 0) { 6777 m_free(n); 6778 n = NULL; 6779 } 6780 } 6781 if (!n) { 6782 m_freem(m); 6783 return ENOBUFS; 6784 } 6785 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6786 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6787 n->m_next = NULL; 6788 m_freem(m); 6789 m = n; 6790 } 6791 6792 /* align the mbuf chain so that extensions are in contiguous region. */ 6793 error = key_align(m, &mh); 6794 if (error) 6795 return error; 6796 6797 msg = mh.msg; 6798 6799 /* check SA type */ 6800 switch (msg->sadb_msg_satype) { 6801 case SADB_SATYPE_UNSPEC: 6802 switch (msg->sadb_msg_type) { 6803 case SADB_GETSPI: 6804 case SADB_UPDATE: 6805 case SADB_ADD: 6806 case SADB_DELETE: 6807 case SADB_GET: 6808 case SADB_ACQUIRE: 6809 case SADB_EXPIRE: 6810 ipseclog((LOG_DEBUG, "%s: must specify satype " 6811 "when msg type=%u.\n", __func__, 6812 msg->sadb_msg_type)); 6813 V_pfkeystat.out_invsatype++; 6814 error = EINVAL; 6815 goto senderror; 6816 } 6817 break; 6818 case SADB_SATYPE_AH: 6819 case SADB_SATYPE_ESP: 6820 case SADB_X_SATYPE_IPCOMP: 6821 case SADB_X_SATYPE_TCPSIGNATURE: 6822 switch (msg->sadb_msg_type) { 6823 case SADB_X_SPDADD: 6824 case SADB_X_SPDDELETE: 6825 case SADB_X_SPDGET: 6826 case SADB_X_SPDDUMP: 6827 case SADB_X_SPDFLUSH: 6828 case SADB_X_SPDSETIDX: 6829 case SADB_X_SPDUPDATE: 6830 case SADB_X_SPDDELETE2: 6831 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6832 __func__, msg->sadb_msg_type)); 6833 V_pfkeystat.out_invsatype++; 6834 error = EINVAL; 6835 goto senderror; 6836 } 6837 break; 6838 case SADB_SATYPE_RSVP: 6839 case SADB_SATYPE_OSPFV2: 6840 case SADB_SATYPE_RIPV2: 6841 case SADB_SATYPE_MIP: 6842 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6843 __func__, msg->sadb_msg_satype)); 6844 V_pfkeystat.out_invsatype++; 6845 error = EOPNOTSUPP; 6846 goto senderror; 6847 case 1: /* XXX: What does it do? */ 6848 if (msg->sadb_msg_type == SADB_X_PROMISC) 6849 break; 6850 /*FALLTHROUGH*/ 6851 default: 6852 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6853 __func__, msg->sadb_msg_satype)); 6854 V_pfkeystat.out_invsatype++; 6855 error = EINVAL; 6856 goto senderror; 6857 } 6858 6859 /* check field of upper layer protocol and address family */ 6860 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6861 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6862 struct sadb_address *src0, *dst0; 6863 u_int plen; 6864 6865 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6866 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6867 6868 /* check upper layer protocol */ 6869 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6870 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6871 "mismatched.\n", __func__)); 6872 V_pfkeystat.out_invaddr++; 6873 error = EINVAL; 6874 goto senderror; 6875 } 6876 6877 /* check family */ 6878 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6879 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6880 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6881 __func__)); 6882 V_pfkeystat.out_invaddr++; 6883 error = EINVAL; 6884 goto senderror; 6885 } 6886 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6887 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6888 ipseclog((LOG_DEBUG, "%s: address struct size " 6889 "mismatched.\n", __func__)); 6890 V_pfkeystat.out_invaddr++; 6891 error = EINVAL; 6892 goto senderror; 6893 } 6894 6895 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6896 case AF_INET: 6897 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6898 sizeof(struct sockaddr_in)) { 6899 V_pfkeystat.out_invaddr++; 6900 error = EINVAL; 6901 goto senderror; 6902 } 6903 break; 6904 case AF_INET6: 6905 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6906 sizeof(struct sockaddr_in6)) { 6907 V_pfkeystat.out_invaddr++; 6908 error = EINVAL; 6909 goto senderror; 6910 } 6911 break; 6912 default: 6913 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6914 __func__)); 6915 V_pfkeystat.out_invaddr++; 6916 error = EAFNOSUPPORT; 6917 goto senderror; 6918 } 6919 6920 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6921 case AF_INET: 6922 plen = sizeof(struct in_addr) << 3; 6923 break; 6924 case AF_INET6: 6925 plen = sizeof(struct in6_addr) << 3; 6926 break; 6927 default: 6928 plen = 0; /*fool gcc*/ 6929 break; 6930 } 6931 6932 /* check max prefix length */ 6933 if (src0->sadb_address_prefixlen > plen || 6934 dst0->sadb_address_prefixlen > plen) { 6935 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6936 __func__)); 6937 V_pfkeystat.out_invaddr++; 6938 error = EINVAL; 6939 goto senderror; 6940 } 6941 6942 /* 6943 * prefixlen == 0 is valid because there can be a case when 6944 * all addresses are matched. 6945 */ 6946 } 6947 6948 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6949 key_typesw[msg->sadb_msg_type] == NULL) { 6950 V_pfkeystat.out_invmsgtype++; 6951 error = EINVAL; 6952 goto senderror; 6953 } 6954 6955 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6956 6957senderror: 6958 msg->sadb_msg_errno = error; 6959 return key_sendup_mbuf(so, m, target); 6960} 6961 6962static int 6963key_senderror(so, m, code) 6964 struct socket *so; 6965 struct mbuf *m; 6966 int code; 6967{ 6968 struct sadb_msg *msg; 6969 6970 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6971 ("mbuf too small, len %u", m->m_len)); 6972 6973 msg = mtod(m, struct sadb_msg *); 6974 msg->sadb_msg_errno = code; 6975 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6976} 6977 6978/* 6979 * set the pointer to each header into message buffer. 6980 * m will be freed on error. 6981 * XXX larger-than-MCLBYTES extension? 6982 */ 6983static int 6984key_align(m, mhp) 6985 struct mbuf *m; 6986 struct sadb_msghdr *mhp; 6987{ 6988 INIT_VNET_IPSEC(curvnet); 6989 struct mbuf *n; 6990 struct sadb_ext *ext; 6991 size_t off, end; 6992 int extlen; 6993 int toff; 6994 6995 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6996 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6997 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6998 ("mbuf too small, len %u", m->m_len)); 6999 7000 /* initialize */ 7001 bzero(mhp, sizeof(*mhp)); 7002 7003 mhp->msg = mtod(m, struct sadb_msg *); 7004 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7005 7006 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7007 extlen = end; /*just in case extlen is not updated*/ 7008 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7009 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7010 if (!n) { 7011 /* m is already freed */ 7012 return ENOBUFS; 7013 } 7014 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7015 7016 /* set pointer */ 7017 switch (ext->sadb_ext_type) { 7018 case SADB_EXT_SA: 7019 case SADB_EXT_ADDRESS_SRC: 7020 case SADB_EXT_ADDRESS_DST: 7021 case SADB_EXT_ADDRESS_PROXY: 7022 case SADB_EXT_LIFETIME_CURRENT: 7023 case SADB_EXT_LIFETIME_HARD: 7024 case SADB_EXT_LIFETIME_SOFT: 7025 case SADB_EXT_KEY_AUTH: 7026 case SADB_EXT_KEY_ENCRYPT: 7027 case SADB_EXT_IDENTITY_SRC: 7028 case SADB_EXT_IDENTITY_DST: 7029 case SADB_EXT_SENSITIVITY: 7030 case SADB_EXT_PROPOSAL: 7031 case SADB_EXT_SUPPORTED_AUTH: 7032 case SADB_EXT_SUPPORTED_ENCRYPT: 7033 case SADB_EXT_SPIRANGE: 7034 case SADB_X_EXT_POLICY: 7035 case SADB_X_EXT_SA2: 7036 /* duplicate check */ 7037 /* 7038 * XXX Are there duplication payloads of either 7039 * KEY_AUTH or KEY_ENCRYPT ? 7040 */ 7041 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7042 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7043 "%u\n", __func__, ext->sadb_ext_type)); 7044 m_freem(m); 7045 V_pfkeystat.out_dupext++; 7046 return EINVAL; 7047 } 7048 break; 7049 default: 7050 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7051 __func__, ext->sadb_ext_type)); 7052 m_freem(m); 7053 V_pfkeystat.out_invexttype++; 7054 return EINVAL; 7055 } 7056 7057 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7058 7059 if (key_validate_ext(ext, extlen)) { 7060 m_freem(m); 7061 V_pfkeystat.out_invlen++; 7062 return EINVAL; 7063 } 7064 7065 n = m_pulldown(m, off, extlen, &toff); 7066 if (!n) { 7067 /* m is already freed */ 7068 return ENOBUFS; 7069 } 7070 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7071 7072 mhp->ext[ext->sadb_ext_type] = ext; 7073 mhp->extoff[ext->sadb_ext_type] = off; 7074 mhp->extlen[ext->sadb_ext_type] = extlen; 7075 } 7076 7077 if (off != end) { 7078 m_freem(m); 7079 V_pfkeystat.out_invlen++; 7080 return EINVAL; 7081 } 7082 7083 return 0; 7084} 7085 7086static int 7087key_validate_ext(ext, len) 7088 const struct sadb_ext *ext; 7089 int len; 7090{ 7091 const struct sockaddr *sa; 7092 enum { NONE, ADDR } checktype = NONE; 7093 int baselen = 0; 7094 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7095 7096 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7097 return EINVAL; 7098 7099 /* if it does not match minimum/maximum length, bail */ 7100 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7101 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7102 return EINVAL; 7103 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7104 return EINVAL; 7105 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7106 return EINVAL; 7107 7108 /* more checks based on sadb_ext_type XXX need more */ 7109 switch (ext->sadb_ext_type) { 7110 case SADB_EXT_ADDRESS_SRC: 7111 case SADB_EXT_ADDRESS_DST: 7112 case SADB_EXT_ADDRESS_PROXY: 7113 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7114 checktype = ADDR; 7115 break; 7116 case SADB_EXT_IDENTITY_SRC: 7117 case SADB_EXT_IDENTITY_DST: 7118 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7119 SADB_X_IDENTTYPE_ADDR) { 7120 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7121 checktype = ADDR; 7122 } else 7123 checktype = NONE; 7124 break; 7125 default: 7126 checktype = NONE; 7127 break; 7128 } 7129 7130 switch (checktype) { 7131 case NONE: 7132 break; 7133 case ADDR: 7134 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7135 if (len < baselen + sal) 7136 return EINVAL; 7137 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7138 return EINVAL; 7139 break; 7140 } 7141 7142 return 0; 7143} 7144 7145void 7146key_init(void) 7147{ 7148 INIT_VNET_IPSEC(curvnet); 7149 int i; 7150 7151 V_key_debug_level = 0; 7152 V_key_spi_trycnt = 1000; 7153 V_key_spi_minval = 0x100; 7154 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7155 V_policy_id = 0; 7156 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7157 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7158 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7159 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7160 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7161 7162 V_acq_seq = 0; 7163 7164 V_ipsec_esp_keymin = 256; 7165 V_ipsec_esp_auth = 0; 7166 V_ipsec_ah_keymin = 128; 7167 7168 SPTREE_LOCK_INIT(); 7169 REGTREE_LOCK_INIT(); 7170 SAHTREE_LOCK_INIT(); 7171 ACQ_LOCK_INIT(); 7172 SPACQ_LOCK_INIT(); 7173 7174 for (i = 0; i < IPSEC_DIR_MAX; i++) 7175 LIST_INIT(&V_sptree[i]); 7176 7177 LIST_INIT(&V_sahtree); 7178 7179 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7180 LIST_INIT(&V_regtree[i]); 7181 7182 LIST_INIT(&V_acqtree); 7183 LIST_INIT(&V_spacqtree); 7184 7185 /* system default */ 7186 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7187 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7188 7189#ifndef IPSEC_DEBUG2 7190 timeout((void *)key_timehandler, (void *)0, hz); 7191#endif /*IPSEC_DEBUG2*/ 7192 7193 /* initialize key statistics */ 7194 keystat.getspi_count = 1; 7195 7196 printf("IPsec: Initialized Security Association Processing.\n"); 7197 7198 return; 7199} 7200 7201/* 7202 * XXX: maybe This function is called after INBOUND IPsec processing. 7203 * 7204 * Special check for tunnel-mode packets. 7205 * We must make some checks for consistency between inner and outer IP header. 7206 * 7207 * xxx more checks to be provided 7208 */ 7209int 7210key_checktunnelsanity(sav, family, src, dst) 7211 struct secasvar *sav; 7212 u_int family; 7213 caddr_t src; 7214 caddr_t dst; 7215{ 7216 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7217 7218 /* XXX: check inner IP header */ 7219 7220 return 1; 7221} 7222 7223/* record data transfer on SA, and update timestamps */ 7224void 7225key_sa_recordxfer(sav, m) 7226 struct secasvar *sav; 7227 struct mbuf *m; 7228{ 7229 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7230 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7231 if (!sav->lft_c) 7232 return; 7233 7234 /* 7235 * XXX Currently, there is a difference of bytes size 7236 * between inbound and outbound processing. 7237 */ 7238 sav->lft_c->bytes += m->m_pkthdr.len; 7239 /* to check bytes lifetime is done in key_timehandler(). */ 7240 7241 /* 7242 * We use the number of packets as the unit of 7243 * allocations. We increment the variable 7244 * whenever {esp,ah}_{in,out}put is called. 7245 */ 7246 sav->lft_c->allocations++; 7247 /* XXX check for expires? */ 7248 7249 /* 7250 * NOTE: We record CURRENT usetime by using wall clock, 7251 * in seconds. HARD and SOFT lifetime are measured by the time 7252 * difference (again in seconds) from usetime. 7253 * 7254 * usetime 7255 * v expire expire 7256 * -----+-----+--------+---> t 7257 * <--------------> HARD 7258 * <-----> SOFT 7259 */ 7260 sav->lft_c->usetime = time_second; 7261 /* XXX check for expires? */ 7262 7263 return; 7264} 7265 7266/* dumb version */ 7267void 7268key_sa_routechange(dst) 7269 struct sockaddr *dst; 7270{ 7271 INIT_VNET_IPSEC(curvnet); 7272 struct secashead *sah; 7273 struct route *ro; 7274 7275 SAHTREE_LOCK(); 7276 LIST_FOREACH(sah, &V_sahtree, chain) { 7277 ro = &sah->sa_route; 7278 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7279 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7280 RTFREE(ro->ro_rt); 7281 ro->ro_rt = (struct rtentry *)NULL; 7282 } 7283 } 7284 SAHTREE_UNLOCK(); 7285} 7286 7287static void 7288key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7289{ 7290 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7291 SAHTREE_LOCK_ASSERT(); 7292 7293 if (sav->state != state) { 7294 if (__LIST_CHAINED(sav)) 7295 LIST_REMOVE(sav, chain); 7296 sav->state = state; 7297 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7298 } 7299} 7300 7301void 7302key_sa_stir_iv(sav) 7303 struct secasvar *sav; 7304{ 7305 7306 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7307 key_randomfill(sav->iv, sav->ivlen); 7308} 7309 7310/* XXX too much? */ 7311static struct mbuf * 7312key_alloc_mbuf(l) 7313 int l; 7314{ 7315 struct mbuf *m = NULL, *n; 7316 int len, t; 7317 7318 len = l; 7319 while (len > 0) { 7320 MGET(n, M_DONTWAIT, MT_DATA); 7321 if (n && len > MLEN) 7322 MCLGET(n, M_DONTWAIT); 7323 if (!n) { 7324 m_freem(m); 7325 return NULL; 7326 } 7327 7328 n->m_next = NULL; 7329 n->m_len = 0; 7330 n->m_len = M_TRAILINGSPACE(n); 7331 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7332 if (n->m_len > len) { 7333 t = (n->m_len - len) & ~(sizeof(long) - 1); 7334 n->m_data += t; 7335 n->m_len = len; 7336 } 7337 7338 len -= n->m_len; 7339 7340 if (m) 7341 m_cat(m, n); 7342 else 7343 m = n; 7344 } 7345 7346 return m; 7347} 7348 7349/* 7350 * Take one of the kernel's security keys and convert it into a PF_KEY 7351 * structure within an mbuf, suitable for sending up to a waiting 7352 * application in user land. 7353 * 7354 * IN: 7355 * src: A pointer to a kernel security key. 7356 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7357 * OUT: 7358 * a valid mbuf or NULL indicating an error 7359 * 7360 */ 7361 7362static struct mbuf * 7363key_setkey(struct seckey *src, u_int16_t exttype) 7364{ 7365 struct mbuf *m; 7366 struct sadb_key *p; 7367 int len; 7368 7369 if (src == NULL) 7370 return NULL; 7371 7372 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7373 m = key_alloc_mbuf(len); 7374 if (m == NULL) 7375 return NULL; 7376 p = mtod(m, struct sadb_key *); 7377 bzero(p, len); 7378 p->sadb_key_len = PFKEY_UNIT64(len); 7379 p->sadb_key_exttype = exttype; 7380 p->sadb_key_bits = src->bits; 7381 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7382 7383 return m; 7384} 7385 7386/* 7387 * Take one of the kernel's lifetime data structures and convert it 7388 * into a PF_KEY structure within an mbuf, suitable for sending up to 7389 * a waiting application in user land. 7390 * 7391 * IN: 7392 * src: A pointer to a kernel lifetime structure. 7393 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7394 * data structures for more information. 7395 * OUT: 7396 * a valid mbuf or NULL indicating an error 7397 * 7398 */ 7399 7400static struct mbuf * 7401key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7402{ 7403 struct mbuf *m = NULL; 7404 struct sadb_lifetime *p; 7405 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7406 7407 if (src == NULL) 7408 return NULL; 7409 7410 m = key_alloc_mbuf(len); 7411 if (m == NULL) 7412 return m; 7413 p = mtod(m, struct sadb_lifetime *); 7414 7415 bzero(p, len); 7416 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7417 p->sadb_lifetime_exttype = exttype; 7418 p->sadb_lifetime_allocations = src->allocations; 7419 p->sadb_lifetime_bytes = src->bytes; 7420 p->sadb_lifetime_addtime = src->addtime; 7421 p->sadb_lifetime_usetime = src->usetime; 7422 7423 return m; 7424 7425} 7426