key.c revision 192880
1/* $FreeBSD: head/sys/netipsec/key.c 192880 2009-05-27 09:31:50Z vanhu $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59#include <sys/vimage.h> 60 61#include <net/if.h> 62#include <net/route.h> 63#include <net/raw_cb.h> 64 65#include <netinet/in.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#include <netinet/in_var.h> 69 70#ifdef INET6 71#include <netinet/ip6.h> 72#include <netinet6/in6_var.h> 73#include <netinet6/ip6_var.h> 74#endif /* INET6 */ 75 76#ifdef INET 77#include <netinet/in_pcb.h> 78#include <netinet/vinet.h> 79#endif 80#ifdef INET6 81#include <netinet6/in6_pcb.h> 82#include <netinet6/vinet6.h> 83#endif /* INET6 */ 84 85#include <net/pfkeyv2.h> 86#include <netipsec/keydb.h> 87#include <netipsec/key.h> 88#include <netipsec/keysock.h> 89#include <netipsec/key_debug.h> 90 91#include <netipsec/ipsec.h> 92#ifdef INET6 93#include <netipsec/ipsec6.h> 94#endif 95 96#include <netipsec/xform.h> 97 98#include <machine/stdarg.h> 99 100/* randomness */ 101#include <sys/random.h> 102#include <sys/vimage.h> 103 104#define FULLMASK 0xff 105#define _BITS(bytes) ((bytes) << 3) 106 107/* 108 * Note on SA reference counting: 109 * - SAs that are not in DEAD state will have (total external reference + 1) 110 * following value in reference count field. they cannot be freed and are 111 * referenced from SA header. 112 * - SAs that are in DEAD state will have (total external reference) 113 * in reference count field. they are ready to be freed. reference from 114 * SA header will be removed in key_delsav(), when the reference count 115 * field hits 0 (= no external reference other than from SA header. 116 */ 117 118#ifdef VIMAGE_GLOBALS 119u_int32_t key_debug_level; 120static u_int key_spi_trycnt; 121static u_int32_t key_spi_minval; 122static u_int32_t key_spi_maxval; 123static u_int32_t policy_id; 124static u_int key_int_random; 125static u_int key_larval_lifetime; 126static int key_blockacq_count; 127static int key_blockacq_lifetime; 128static int key_preferred_oldsa; 129 130static u_int32_t acq_seq; 131 132static int ipsec_esp_keymin; 133static int ipsec_esp_auth; 134static int ipsec_ah_keymin; 135 136static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 137static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 138static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 139static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 140static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 141#endif /* VIMAGE_GLOBALS */ 142 143static struct mtx sptree_lock; 144#define SPTREE_LOCK_INIT() \ 145 mtx_init(&sptree_lock, "sptree", \ 146 "fast ipsec security policy database", MTX_DEF) 147#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 148#define SPTREE_LOCK() mtx_lock(&sptree_lock) 149#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 150#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 151 152static struct mtx sahtree_lock; 153#define SAHTREE_LOCK_INIT() \ 154 mtx_init(&sahtree_lock, "sahtree", \ 155 "fast ipsec security association database", MTX_DEF) 156#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 157#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 158#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 159#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 160 161 /* registed list */ 162static struct mtx regtree_lock; 163#define REGTREE_LOCK_INIT() \ 164 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 165#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 166#define REGTREE_LOCK() mtx_lock(®tree_lock) 167#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 168#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 169 170static struct mtx acq_lock; 171#define ACQ_LOCK_INIT() \ 172 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 173#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 174#define ACQ_LOCK() mtx_lock(&acq_lock) 175#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 176#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 177 178static struct mtx spacq_lock; 179#define SPACQ_LOCK_INIT() \ 180 mtx_init(&spacq_lock, "spacqtree", \ 181 "fast ipsec security policy acquire list", MTX_DEF) 182#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 183#define SPACQ_LOCK() mtx_lock(&spacq_lock) 184#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 185#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 186 187/* search order for SAs */ 188static const u_int saorder_state_valid_prefer_old[] = { 189 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 190}; 191static const u_int saorder_state_valid_prefer_new[] = { 192 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 193}; 194static const u_int saorder_state_alive[] = { 195 /* except DEAD */ 196 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 197}; 198static const u_int saorder_state_any[] = { 199 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 200 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 201}; 202 203static const int minsize[] = { 204 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 205 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 206 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 207 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 208 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 209 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 210 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 211 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 212 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 213 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 214 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 215 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 216 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 217 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 218 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 219 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 220 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 221 0, /* SADB_X_EXT_KMPRIVATE */ 222 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 223 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 224}; 225static const int maxsize[] = { 226 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 227 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 228 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 229 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 230 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 231 0, /* SADB_EXT_ADDRESS_SRC */ 232 0, /* SADB_EXT_ADDRESS_DST */ 233 0, /* SADB_EXT_ADDRESS_PROXY */ 234 0, /* SADB_EXT_KEY_AUTH */ 235 0, /* SADB_EXT_KEY_ENCRYPT */ 236 0, /* SADB_EXT_IDENTITY_SRC */ 237 0, /* SADB_EXT_IDENTITY_DST */ 238 0, /* SADB_EXT_SENSITIVITY */ 239 0, /* SADB_EXT_PROPOSAL */ 240 0, /* SADB_EXT_SUPPORTED_AUTH */ 241 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 242 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 243 0, /* SADB_X_EXT_KMPRIVATE */ 244 0, /* SADB_X_EXT_POLICY */ 245 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 246}; 247 248#ifdef SYSCTL_DECL 249SYSCTL_DECL(_net_key); 250#endif 251 252SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_DEBUG_LEVEL, debug, 253 CTLFLAG_RW, key_debug_level, 0, ""); 254 255/* max count of trial for the decision of spi value */ 256SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_SPI_TRY, spi_trycnt, 257 CTLFLAG_RW, key_spi_trycnt, 0, ""); 258 259/* minimum spi value to allocate automatically. */ 260SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MIN_VALUE, 261 spi_minval, CTLFLAG_RW, key_spi_minval, 0, ""); 262 263/* maximun spi value to allocate automatically. */ 264SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MAX_VALUE, 265 spi_maxval, CTLFLAG_RW, key_spi_maxval, 0, ""); 266 267/* interval to initialize randseed */ 268SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_RANDOM_INT, 269 int_random, CTLFLAG_RW, key_int_random, 0, ""); 270 271/* lifetime for larval SA */ 272SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_LARVAL_LIFETIME, 273 larval_lifetime, CTLFLAG_RW, key_larval_lifetime, 0, ""); 274 275/* counter for blocking to send SADB_ACQUIRE to IKEd */ 276SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_COUNT, 277 blockacq_count, CTLFLAG_RW, key_blockacq_count, 0, ""); 278 279/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 280SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_LIFETIME, 281 blockacq_lifetime, CTLFLAG_RW, key_blockacq_lifetime, 0, ""); 282 283/* ESP auth */ 284SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_AUTH, esp_auth, 285 CTLFLAG_RW, ipsec_esp_auth, 0, ""); 286 287/* minimum ESP key length */ 288SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_KEYMIN, 289 esp_keymin, CTLFLAG_RW, ipsec_esp_keymin, 0, ""); 290 291/* minimum AH key length */ 292SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_AH_KEYMIN, ah_keymin, 293 CTLFLAG_RW, ipsec_ah_keymin, 0, ""); 294 295/* perfered old SA rather than new SA */ 296SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_PREFERED_OLDSA, 297 preferred_oldsa, CTLFLAG_RW, key_preferred_oldsa, 0, ""); 298 299#define __LIST_CHAINED(elm) \ 300 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 301#define LIST_INSERT_TAIL(head, elm, type, field) \ 302do {\ 303 struct type *curelm = LIST_FIRST(head); \ 304 if (curelm == NULL) {\ 305 LIST_INSERT_HEAD(head, elm, field); \ 306 } else { \ 307 while (LIST_NEXT(curelm, field)) \ 308 curelm = LIST_NEXT(curelm, field);\ 309 LIST_INSERT_AFTER(curelm, elm, field);\ 310 }\ 311} while (0) 312 313#define KEY_CHKSASTATE(head, sav, name) \ 314do { \ 315 if ((head) != (sav)) { \ 316 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 317 (name), (head), (sav))); \ 318 continue; \ 319 } \ 320} while (0) 321 322#define KEY_CHKSPDIR(head, sp, name) \ 323do { \ 324 if ((head) != (sp)) { \ 325 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 326 "anyway continue.\n", \ 327 (name), (head), (sp))); \ 328 } \ 329} while (0) 330 331MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 332MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 333MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 334MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 335MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 336MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 337MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 338 339/* 340 * set parameters into secpolicyindex buffer. 341 * Must allocate secpolicyindex buffer passed to this function. 342 */ 343#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 344do { \ 345 bzero((idx), sizeof(struct secpolicyindex)); \ 346 (idx)->dir = (_dir); \ 347 (idx)->prefs = (ps); \ 348 (idx)->prefd = (pd); \ 349 (idx)->ul_proto = (ulp); \ 350 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 351 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 352} while (0) 353 354/* 355 * set parameters into secasindex buffer. 356 * Must allocate secasindex buffer before calling this function. 357 */ 358#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 359do { \ 360 bzero((idx), sizeof(struct secasindex)); \ 361 (idx)->proto = (p); \ 362 (idx)->mode = (m); \ 363 (idx)->reqid = (r); \ 364 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 365 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 366} while (0) 367 368/* key statistics */ 369struct _keystat { 370 u_long getspi_count; /* the avarage of count to try to get new SPI */ 371} keystat; 372 373struct sadb_msghdr { 374 struct sadb_msg *msg; 375 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 376 int extoff[SADB_EXT_MAX + 1]; 377 int extlen[SADB_EXT_MAX + 1]; 378}; 379 380static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 381static void key_freesp_so __P((struct secpolicy **)); 382static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 383static void key_delsp __P((struct secpolicy *)); 384static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 385static void _key_delsp(struct secpolicy *sp); 386static struct secpolicy *key_getspbyid __P((u_int32_t)); 387static u_int32_t key_newreqid __P((void)); 388static struct mbuf *key_gather_mbuf __P((struct mbuf *, 389 const struct sadb_msghdr *, int, int, ...)); 390static int key_spdadd __P((struct socket *, struct mbuf *, 391 const struct sadb_msghdr *)); 392static u_int32_t key_getnewspid __P((void)); 393static int key_spddelete __P((struct socket *, struct mbuf *, 394 const struct sadb_msghdr *)); 395static int key_spddelete2 __P((struct socket *, struct mbuf *, 396 const struct sadb_msghdr *)); 397static int key_spdget __P((struct socket *, struct mbuf *, 398 const struct sadb_msghdr *)); 399static int key_spdflush __P((struct socket *, struct mbuf *, 400 const struct sadb_msghdr *)); 401static int key_spddump __P((struct socket *, struct mbuf *, 402 const struct sadb_msghdr *)); 403static struct mbuf *key_setdumpsp __P((struct secpolicy *, 404 u_int8_t, u_int32_t, u_int32_t)); 405static u_int key_getspreqmsglen __P((struct secpolicy *)); 406static int key_spdexpire __P((struct secpolicy *)); 407static struct secashead *key_newsah __P((struct secasindex *)); 408static void key_delsah __P((struct secashead *)); 409static struct secasvar *key_newsav __P((struct mbuf *, 410 const struct sadb_msghdr *, struct secashead *, int *, 411 const char*, int)); 412#define KEY_NEWSAV(m, sadb, sah, e) \ 413 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 414static void key_delsav __P((struct secasvar *)); 415static struct secashead *key_getsah __P((struct secasindex *)); 416static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 417static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 418static int key_setsaval __P((struct secasvar *, struct mbuf *, 419 const struct sadb_msghdr *)); 420static int key_mature __P((struct secasvar *)); 421static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 422 u_int8_t, u_int32_t, u_int32_t)); 423static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 424 u_int32_t, pid_t, u_int16_t)); 425static struct mbuf *key_setsadbsa __P((struct secasvar *)); 426static struct mbuf *key_setsadbaddr __P((u_int16_t, 427 const struct sockaddr *, u_int8_t, u_int16_t)); 428static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 429static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 430 u_int32_t)); 431static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 432 struct malloc_type *); 433static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 434 struct malloc_type *type); 435#ifdef INET6 436static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 437#endif 438 439/* flags for key_cmpsaidx() */ 440#define CMP_HEAD 1 /* protocol, addresses. */ 441#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 442#define CMP_REQID 3 /* additionally HEAD, reaid. */ 443#define CMP_EXACTLY 4 /* all elements. */ 444static int key_cmpsaidx 445 __P((const struct secasindex *, const struct secasindex *, int)); 446 447static int key_cmpspidx_exactly 448 __P((struct secpolicyindex *, struct secpolicyindex *)); 449static int key_cmpspidx_withmask 450 __P((struct secpolicyindex *, struct secpolicyindex *)); 451static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 452static int key_bbcmp __P((const void *, const void *, u_int)); 453static u_int16_t key_satype2proto __P((u_int8_t)); 454static u_int8_t key_proto2satype __P((u_int16_t)); 455 456static int key_getspi __P((struct socket *, struct mbuf *, 457 const struct sadb_msghdr *)); 458static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 459 struct secasindex *)); 460static int key_update __P((struct socket *, struct mbuf *, 461 const struct sadb_msghdr *)); 462#ifdef IPSEC_DOSEQCHECK 463static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 464#endif 465static int key_add __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467static int key_setident __P((struct secashead *, struct mbuf *, 468 const struct sadb_msghdr *)); 469static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 470 const struct sadb_msghdr *)); 471static int key_delete __P((struct socket *, struct mbuf *, 472 const struct sadb_msghdr *)); 473static int key_get __P((struct socket *, struct mbuf *, 474 const struct sadb_msghdr *)); 475 476static void key_getcomb_setlifetime __P((struct sadb_comb *)); 477static struct mbuf *key_getcomb_esp __P((void)); 478static struct mbuf *key_getcomb_ah __P((void)); 479static struct mbuf *key_getcomb_ipcomp __P((void)); 480static struct mbuf *key_getprop __P((const struct secasindex *)); 481 482static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 483static struct secacq *key_newacq __P((const struct secasindex *)); 484static struct secacq *key_getacq __P((const struct secasindex *)); 485static struct secacq *key_getacqbyseq __P((u_int32_t)); 486static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 487static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 488static int key_acquire2 __P((struct socket *, struct mbuf *, 489 const struct sadb_msghdr *)); 490static int key_register __P((struct socket *, struct mbuf *, 491 const struct sadb_msghdr *)); 492static int key_expire __P((struct secasvar *)); 493static int key_flush __P((struct socket *, struct mbuf *, 494 const struct sadb_msghdr *)); 495static int key_dump __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497static int key_promisc __P((struct socket *, struct mbuf *, 498 const struct sadb_msghdr *)); 499static int key_senderror __P((struct socket *, struct mbuf *, int)); 500static int key_validate_ext __P((const struct sadb_ext *, int)); 501static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 502static struct mbuf *key_setlifetime(struct seclifetime *src, 503 u_int16_t exttype); 504static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 505 506#if 0 507static const char *key_getfqdn __P((void)); 508static const char *key_getuserfqdn __P((void)); 509#endif 510static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 511static struct mbuf *key_alloc_mbuf __P((int)); 512 513static __inline void 514sa_initref(struct secasvar *sav) 515{ 516 517 refcount_init(&sav->refcnt, 1); 518} 519static __inline void 520sa_addref(struct secasvar *sav) 521{ 522 523 refcount_acquire(&sav->refcnt); 524 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 525} 526static __inline int 527sa_delref(struct secasvar *sav) 528{ 529 530 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 531 return (refcount_release(&sav->refcnt)); 532} 533 534#define SP_ADDREF(p) do { \ 535 (p)->refcnt++; \ 536 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 537} while (0) 538#define SP_DELREF(p) do { \ 539 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 540 (p)->refcnt--; \ 541} while (0) 542 543 544/* 545 * Update the refcnt while holding the SPTREE lock. 546 */ 547void 548key_addref(struct secpolicy *sp) 549{ 550 SPTREE_LOCK(); 551 SP_ADDREF(sp); 552 SPTREE_UNLOCK(); 553} 554 555/* 556 * Return 0 when there are known to be no SP's for the specified 557 * direction. Otherwise return 1. This is used by IPsec code 558 * to optimize performance. 559 */ 560int 561key_havesp(u_int dir) 562{ 563 INIT_VNET_IPSEC(curvnet); 564 565 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 566 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 567} 568 569/* %%% IPsec policy management */ 570/* 571 * allocating a SP for OUTBOUND or INBOUND packet. 572 * Must call key_freesp() later. 573 * OUT: NULL: not found 574 * others: found and return the pointer. 575 */ 576struct secpolicy * 577key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 578{ 579 INIT_VNET_IPSEC(curvnet); 580 struct secpolicy *sp; 581 582 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 583 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 584 ("invalid direction %u", dir)); 585 586 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 587 printf("DP %s from %s:%u\n", __func__, where, tag)); 588 589 /* get a SP entry */ 590 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 591 printf("*** objects\n"); 592 kdebug_secpolicyindex(spidx)); 593 594 SPTREE_LOCK(); 595 LIST_FOREACH(sp, &V_sptree[dir], chain) { 596 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 597 printf("*** in SPD\n"); 598 kdebug_secpolicyindex(&sp->spidx)); 599 600 if (sp->state == IPSEC_SPSTATE_DEAD) 601 continue; 602 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 603 goto found; 604 } 605 sp = NULL; 606found: 607 if (sp) { 608 /* sanity check */ 609 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 610 611 /* found a SPD entry */ 612 sp->lastused = time_second; 613 SP_ADDREF(sp); 614 } 615 SPTREE_UNLOCK(); 616 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 619 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 620 return sp; 621} 622 623/* 624 * allocating a SP for OUTBOUND or INBOUND packet. 625 * Must call key_freesp() later. 626 * OUT: NULL: not found 627 * others: found and return the pointer. 628 */ 629struct secpolicy * 630key_allocsp2(u_int32_t spi, 631 union sockaddr_union *dst, 632 u_int8_t proto, 633 u_int dir, 634 const char* where, int tag) 635{ 636 INIT_VNET_IPSEC(curvnet); 637 struct secpolicy *sp; 638 639 IPSEC_ASSERT(dst != NULL, ("null dst")); 640 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 641 ("invalid direction %u", dir)); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 644 printf("DP %s from %s:%u\n", __func__, where, tag)); 645 646 /* get a SP entry */ 647 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 648 printf("*** objects\n"); 649 printf("spi %u proto %u dir %u\n", spi, proto, dir); 650 kdebug_sockaddr(&dst->sa)); 651 652 SPTREE_LOCK(); 653 LIST_FOREACH(sp, &V_sptree[dir], chain) { 654 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 655 printf("*** in SPD\n"); 656 kdebug_secpolicyindex(&sp->spidx)); 657 658 if (sp->state == IPSEC_SPSTATE_DEAD) 659 continue; 660 /* compare simple values, then dst address */ 661 if (sp->spidx.ul_proto != proto) 662 continue; 663 /* NB: spi's must exist and match */ 664 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 665 continue; 666 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 667 goto found; 668 } 669 sp = NULL; 670found: 671 if (sp) { 672 /* sanity check */ 673 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 674 675 /* found a SPD entry */ 676 sp->lastused = time_second; 677 SP_ADDREF(sp); 678 } 679 SPTREE_UNLOCK(); 680 681 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 682 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 683 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 684 return sp; 685} 686 687#if 0 688/* 689 * return a policy that matches this particular inbound packet. 690 * XXX slow 691 */ 692struct secpolicy * 693key_gettunnel(const struct sockaddr *osrc, 694 const struct sockaddr *odst, 695 const struct sockaddr *isrc, 696 const struct sockaddr *idst, 697 const char* where, int tag) 698{ 699 INIT_VNET_IPSEC(curvnet); 700 struct secpolicy *sp; 701 const int dir = IPSEC_DIR_INBOUND; 702 struct ipsecrequest *r1, *r2, *p; 703 struct secpolicyindex spidx; 704 705 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 706 printf("DP %s from %s:%u\n", __func__, where, tag)); 707 708 if (isrc->sa_family != idst->sa_family) { 709 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 710 __func__, isrc->sa_family, idst->sa_family)); 711 sp = NULL; 712 goto done; 713 } 714 715 SPTREE_LOCK(); 716 LIST_FOREACH(sp, &V_sptree[dir], chain) { 717 if (sp->state == IPSEC_SPSTATE_DEAD) 718 continue; 719 720 r1 = r2 = NULL; 721 for (p = sp->req; p; p = p->next) { 722 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 723 continue; 724 725 r1 = r2; 726 r2 = p; 727 728 if (!r1) { 729 /* here we look at address matches only */ 730 spidx = sp->spidx; 731 if (isrc->sa_len > sizeof(spidx.src) || 732 idst->sa_len > sizeof(spidx.dst)) 733 continue; 734 bcopy(isrc, &spidx.src, isrc->sa_len); 735 bcopy(idst, &spidx.dst, idst->sa_len); 736 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 737 continue; 738 } else { 739 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 740 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 741 continue; 742 } 743 744 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 745 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 746 continue; 747 748 goto found; 749 } 750 } 751 sp = NULL; 752found: 753 if (sp) { 754 sp->lastused = time_second; 755 SP_ADDREF(sp); 756 } 757 SPTREE_UNLOCK(); 758done: 759 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 760 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 761 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 762 return sp; 763} 764#endif 765 766/* 767 * allocating an SA entry for an *OUTBOUND* packet. 768 * checking each request entries in SP, and acquire an SA if need. 769 * OUT: 0: there are valid requests. 770 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 771 */ 772int 773key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 774{ 775 INIT_VNET_IPSEC(curvnet); 776 u_int level; 777 int error; 778 779 IPSEC_ASSERT(isr != NULL, ("null isr")); 780 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 781 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 782 saidx->mode == IPSEC_MODE_TUNNEL, 783 ("unexpected policy %u", saidx->mode)); 784 785 /* 786 * XXX guard against protocol callbacks from the crypto 787 * thread as they reference ipsecrequest.sav which we 788 * temporarily null out below. Need to rethink how we 789 * handle bundled SA's in the callback thread. 790 */ 791 IPSECREQUEST_LOCK_ASSERT(isr); 792 793 /* get current level */ 794 level = ipsec_get_reqlevel(isr); 795#if 0 796 /* 797 * We do allocate new SA only if the state of SA in the holder is 798 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 799 */ 800 if (isr->sav != NULL) { 801 if (isr->sav->sah == NULL) 802 panic("%s: sah is null.\n", __func__); 803 if (isr->sav == (struct secasvar *)LIST_FIRST( 804 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 805 KEY_FREESAV(&isr->sav); 806 isr->sav = NULL; 807 } 808 } 809#else 810 /* 811 * we free any SA stashed in the IPsec request because a different 812 * SA may be involved each time this request is checked, either 813 * because new SAs are being configured, or this request is 814 * associated with an unconnected datagram socket, or this request 815 * is associated with a system default policy. 816 * 817 * The operation may have negative impact to performance. We may 818 * want to check cached SA carefully, rather than picking new SA 819 * every time. 820 */ 821 if (isr->sav != NULL) { 822 KEY_FREESAV(&isr->sav); 823 isr->sav = NULL; 824 } 825#endif 826 827 /* 828 * new SA allocation if no SA found. 829 * key_allocsa_policy should allocate the oldest SA available. 830 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 831 */ 832 if (isr->sav == NULL) 833 isr->sav = key_allocsa_policy(saidx); 834 835 /* When there is SA. */ 836 if (isr->sav != NULL) { 837 if (isr->sav->state != SADB_SASTATE_MATURE && 838 isr->sav->state != SADB_SASTATE_DYING) 839 return EINVAL; 840 return 0; 841 } 842 843 /* there is no SA */ 844 error = key_acquire(saidx, isr->sp); 845 if (error != 0) { 846 /* XXX What should I do ? */ 847 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 848 __func__, error)); 849 return error; 850 } 851 852 if (level != IPSEC_LEVEL_REQUIRE) { 853 /* XXX sigh, the interface to this routine is botched */ 854 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 855 return 0; 856 } else { 857 return ENOENT; 858 } 859} 860 861/* 862 * allocating a SA for policy entry from SAD. 863 * NOTE: searching SAD of aliving state. 864 * OUT: NULL: not found. 865 * others: found and return the pointer. 866 */ 867static struct secasvar * 868key_allocsa_policy(const struct secasindex *saidx) 869{ 870#define N(a) _ARRAYLEN(a) 871 INIT_VNET_IPSEC(curvnet); 872 struct secashead *sah; 873 struct secasvar *sav; 874 u_int stateidx, arraysize; 875 const u_int *state_valid; 876 877 SAHTREE_LOCK(); 878 LIST_FOREACH(sah, &V_sahtree, chain) { 879 if (sah->state == SADB_SASTATE_DEAD) 880 continue; 881 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 882 if (V_key_preferred_oldsa) { 883 state_valid = saorder_state_valid_prefer_old; 884 arraysize = N(saorder_state_valid_prefer_old); 885 } else { 886 state_valid = saorder_state_valid_prefer_new; 887 arraysize = N(saorder_state_valid_prefer_new); 888 } 889 SAHTREE_UNLOCK(); 890 goto found; 891 } 892 } 893 SAHTREE_UNLOCK(); 894 895 return NULL; 896 897 found: 898 /* search valid state */ 899 for (stateidx = 0; stateidx < arraysize; stateidx++) { 900 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 901 if (sav != NULL) 902 return sav; 903 } 904 905 return NULL; 906#undef N 907} 908 909/* 910 * searching SAD with direction, protocol, mode and state. 911 * called by key_allocsa_policy(). 912 * OUT: 913 * NULL : not found 914 * others : found, pointer to a SA. 915 */ 916static struct secasvar * 917key_do_allocsa_policy(struct secashead *sah, u_int state) 918{ 919 INIT_VNET_IPSEC(curvnet); 920 struct secasvar *sav, *nextsav, *candidate, *d; 921 922 /* initilize */ 923 candidate = NULL; 924 925 SAHTREE_LOCK(); 926 for (sav = LIST_FIRST(&sah->savtree[state]); 927 sav != NULL; 928 sav = nextsav) { 929 930 nextsav = LIST_NEXT(sav, chain); 931 932 /* sanity check */ 933 KEY_CHKSASTATE(sav->state, state, __func__); 934 935 /* initialize */ 936 if (candidate == NULL) { 937 candidate = sav; 938 continue; 939 } 940 941 /* Which SA is the better ? */ 942 943 IPSEC_ASSERT(candidate->lft_c != NULL, 944 ("null candidate lifetime")); 945 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 946 947 /* What the best method is to compare ? */ 948 if (V_key_preferred_oldsa) { 949 if (candidate->lft_c->addtime > 950 sav->lft_c->addtime) { 951 candidate = sav; 952 } 953 continue; 954 /*NOTREACHED*/ 955 } 956 957 /* preferred new sa rather than old sa */ 958 if (candidate->lft_c->addtime < 959 sav->lft_c->addtime) { 960 d = candidate; 961 candidate = sav; 962 } else 963 d = sav; 964 965 /* 966 * prepared to delete the SA when there is more 967 * suitable candidate and the lifetime of the SA is not 968 * permanent. 969 */ 970 if (d->lft_h->addtime != 0) { 971 struct mbuf *m, *result; 972 u_int8_t satype; 973 974 key_sa_chgstate(d, SADB_SASTATE_DEAD); 975 976 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 977 978 satype = key_proto2satype(d->sah->saidx.proto); 979 if (satype == 0) 980 goto msgfail; 981 982 m = key_setsadbmsg(SADB_DELETE, 0, 983 satype, 0, 0, d->refcnt - 1); 984 if (!m) 985 goto msgfail; 986 result = m; 987 988 /* set sadb_address for saidx's. */ 989 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 990 &d->sah->saidx.src.sa, 991 d->sah->saidx.src.sa.sa_len << 3, 992 IPSEC_ULPROTO_ANY); 993 if (!m) 994 goto msgfail; 995 m_cat(result, m); 996 997 /* set sadb_address for saidx's. */ 998 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 999 &d->sah->saidx.dst.sa, 1000 d->sah->saidx.dst.sa.sa_len << 3, 1001 IPSEC_ULPROTO_ANY); 1002 if (!m) 1003 goto msgfail; 1004 m_cat(result, m); 1005 1006 /* create SA extension */ 1007 m = key_setsadbsa(d); 1008 if (!m) 1009 goto msgfail; 1010 m_cat(result, m); 1011 1012 if (result->m_len < sizeof(struct sadb_msg)) { 1013 result = m_pullup(result, 1014 sizeof(struct sadb_msg)); 1015 if (result == NULL) 1016 goto msgfail; 1017 } 1018 1019 result->m_pkthdr.len = 0; 1020 for (m = result; m; m = m->m_next) 1021 result->m_pkthdr.len += m->m_len; 1022 mtod(result, struct sadb_msg *)->sadb_msg_len = 1023 PFKEY_UNIT64(result->m_pkthdr.len); 1024 1025 if (key_sendup_mbuf(NULL, result, 1026 KEY_SENDUP_REGISTERED)) 1027 goto msgfail; 1028 msgfail: 1029 KEY_FREESAV(&d); 1030 } 1031 } 1032 if (candidate) { 1033 sa_addref(candidate); 1034 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1035 printf("DP %s cause refcnt++:%d SA:%p\n", 1036 __func__, candidate->refcnt, candidate)); 1037 } 1038 SAHTREE_UNLOCK(); 1039 1040 return candidate; 1041} 1042 1043/* 1044 * allocating a usable SA entry for a *INBOUND* packet. 1045 * Must call key_freesav() later. 1046 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1047 * NULL: not found, or error occured. 1048 * 1049 * In the comparison, no source address is used--for RFC2401 conformance. 1050 * To quote, from section 4.1: 1051 * A security association is uniquely identified by a triple consisting 1052 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1053 * security protocol (AH or ESP) identifier. 1054 * Note that, however, we do need to keep source address in IPsec SA. 1055 * IKE specification and PF_KEY specification do assume that we 1056 * keep source address in IPsec SA. We see a tricky situation here. 1057 */ 1058struct secasvar * 1059key_allocsa( 1060 union sockaddr_union *dst, 1061 u_int proto, 1062 u_int32_t spi, 1063 const char* where, int tag) 1064{ 1065 INIT_VNET_IPSEC(curvnet); 1066 struct secashead *sah; 1067 struct secasvar *sav; 1068 u_int stateidx, arraysize, state; 1069 const u_int *saorder_state_valid; 1070 1071 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1072 1073 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1074 printf("DP %s from %s:%u\n", __func__, where, tag)); 1075 1076 /* 1077 * searching SAD. 1078 * XXX: to be checked internal IP header somewhere. Also when 1079 * IPsec tunnel packet is received. But ESP tunnel mode is 1080 * encrypted so we can't check internal IP header. 1081 */ 1082 SAHTREE_LOCK(); 1083 if (V_key_preferred_oldsa) { 1084 saorder_state_valid = saorder_state_valid_prefer_old; 1085 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1086 } else { 1087 saorder_state_valid = saorder_state_valid_prefer_new; 1088 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1089 } 1090 LIST_FOREACH(sah, &V_sahtree, chain) { 1091 /* search valid state */ 1092 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1093 state = saorder_state_valid[stateidx]; 1094 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1095 /* sanity check */ 1096 KEY_CHKSASTATE(sav->state, state, __func__); 1097 /* do not return entries w/ unusable state */ 1098 if (sav->state != SADB_SASTATE_MATURE && 1099 sav->state != SADB_SASTATE_DYING) 1100 continue; 1101 if (proto != sav->sah->saidx.proto) 1102 continue; 1103 if (spi != sav->spi) 1104 continue; 1105#if 0 /* don't check src */ 1106 /* check src address */ 1107 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1108 continue; 1109#endif 1110 /* check dst address */ 1111 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1112 continue; 1113 sa_addref(sav); 1114 goto done; 1115 } 1116 } 1117 } 1118 sav = NULL; 1119done: 1120 SAHTREE_UNLOCK(); 1121 1122 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1123 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1124 sav, sav ? sav->refcnt : 0)); 1125 return sav; 1126} 1127 1128/* 1129 * Must be called after calling key_allocsp(). 1130 * For both the packet without socket and key_freeso(). 1131 */ 1132void 1133_key_freesp(struct secpolicy **spp, const char* where, int tag) 1134{ 1135 INIT_VNET_IPSEC(curvnet); 1136 struct secpolicy *sp = *spp; 1137 1138 IPSEC_ASSERT(sp != NULL, ("null sp")); 1139 1140 SPTREE_LOCK(); 1141 SP_DELREF(sp); 1142 1143 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1144 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1145 __func__, sp, sp->id, where, tag, sp->refcnt)); 1146 1147 if (sp->refcnt == 0) { 1148 *spp = NULL; 1149 key_delsp(sp); 1150 } 1151 SPTREE_UNLOCK(); 1152} 1153 1154/* 1155 * Must be called after calling key_allocsp(). 1156 * For the packet with socket. 1157 */ 1158void 1159key_freeso(struct socket *so) 1160{ 1161 INIT_VNET_IPSEC(curvnet); 1162 IPSEC_ASSERT(so != NULL, ("null so")); 1163 1164 switch (so->so_proto->pr_domain->dom_family) { 1165#if defined(INET) || defined(INET6) 1166#ifdef INET 1167 case PF_INET: 1168#endif 1169#ifdef INET6 1170 case PF_INET6: 1171#endif 1172 { 1173 struct inpcb *pcb = sotoinpcb(so); 1174 1175 /* Does it have a PCB ? */ 1176 if (pcb == NULL) 1177 return; 1178 key_freesp_so(&pcb->inp_sp->sp_in); 1179 key_freesp_so(&pcb->inp_sp->sp_out); 1180 } 1181 break; 1182#endif /* INET || INET6 */ 1183 default: 1184 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1185 __func__, so->so_proto->pr_domain->dom_family)); 1186 return; 1187 } 1188} 1189 1190static void 1191key_freesp_so(struct secpolicy **sp) 1192{ 1193 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1194 1195 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1196 (*sp)->policy == IPSEC_POLICY_BYPASS) 1197 return; 1198 1199 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1200 ("invalid policy %u", (*sp)->policy)); 1201 KEY_FREESP(sp); 1202} 1203 1204/* 1205 * Must be called after calling key_allocsa(). 1206 * This function is called by key_freesp() to free some SA allocated 1207 * for a policy. 1208 */ 1209void 1210key_freesav(struct secasvar **psav, const char* where, int tag) 1211{ 1212 INIT_VNET_IPSEC(curvnet); 1213 struct secasvar *sav = *psav; 1214 1215 IPSEC_ASSERT(sav != NULL, ("null sav")); 1216 1217 if (sa_delref(sav)) { 1218 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1219 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1220 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1221 *psav = NULL; 1222 key_delsav(sav); 1223 } else { 1224 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1225 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1226 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1227 } 1228} 1229 1230/* %%% SPD management */ 1231/* 1232 * free security policy entry. 1233 */ 1234static void 1235key_delsp(struct secpolicy *sp) 1236{ 1237 struct ipsecrequest *isr, *nextisr; 1238 1239 IPSEC_ASSERT(sp != NULL, ("null sp")); 1240 SPTREE_LOCK_ASSERT(); 1241 1242 sp->state = IPSEC_SPSTATE_DEAD; 1243 1244 IPSEC_ASSERT(sp->refcnt == 0, 1245 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1246 1247 /* remove from SP index */ 1248 if (__LIST_CHAINED(sp)) 1249 LIST_REMOVE(sp, chain); 1250 1251 for (isr = sp->req; isr != NULL; isr = nextisr) { 1252 if (isr->sav != NULL) { 1253 KEY_FREESAV(&isr->sav); 1254 isr->sav = NULL; 1255 } 1256 1257 nextisr = isr->next; 1258 ipsec_delisr(isr); 1259 } 1260 _key_delsp(sp); 1261} 1262 1263/* 1264 * search SPD 1265 * OUT: NULL : not found 1266 * others : found, pointer to a SP. 1267 */ 1268static struct secpolicy * 1269key_getsp(struct secpolicyindex *spidx) 1270{ 1271 INIT_VNET_IPSEC(curvnet); 1272 struct secpolicy *sp; 1273 1274 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1275 1276 SPTREE_LOCK(); 1277 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1278 if (sp->state == IPSEC_SPSTATE_DEAD) 1279 continue; 1280 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1281 SP_ADDREF(sp); 1282 break; 1283 } 1284 } 1285 SPTREE_UNLOCK(); 1286 1287 return sp; 1288} 1289 1290/* 1291 * get SP by index. 1292 * OUT: NULL : not found 1293 * others : found, pointer to a SP. 1294 */ 1295static struct secpolicy * 1296key_getspbyid(u_int32_t id) 1297{ 1298 INIT_VNET_IPSEC(curvnet); 1299 struct secpolicy *sp; 1300 1301 SPTREE_LOCK(); 1302 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1303 if (sp->state == IPSEC_SPSTATE_DEAD) 1304 continue; 1305 if (sp->id == id) { 1306 SP_ADDREF(sp); 1307 goto done; 1308 } 1309 } 1310 1311 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1312 if (sp->state == IPSEC_SPSTATE_DEAD) 1313 continue; 1314 if (sp->id == id) { 1315 SP_ADDREF(sp); 1316 goto done; 1317 } 1318 } 1319done: 1320 SPTREE_UNLOCK(); 1321 1322 return sp; 1323} 1324 1325struct secpolicy * 1326key_newsp(const char* where, int tag) 1327{ 1328 INIT_VNET_IPSEC(curvnet); 1329 struct secpolicy *newsp = NULL; 1330 1331 newsp = (struct secpolicy *) 1332 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1333 if (newsp) { 1334 SECPOLICY_LOCK_INIT(newsp); 1335 newsp->refcnt = 1; 1336 newsp->req = NULL; 1337 } 1338 1339 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1340 printf("DP %s from %s:%u return SP:%p\n", __func__, 1341 where, tag, newsp)); 1342 return newsp; 1343} 1344 1345static void 1346_key_delsp(struct secpolicy *sp) 1347{ 1348 SECPOLICY_LOCK_DESTROY(sp); 1349 free(sp, M_IPSEC_SP); 1350} 1351 1352/* 1353 * create secpolicy structure from sadb_x_policy structure. 1354 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1355 * so must be set properly later. 1356 */ 1357struct secpolicy * 1358key_msg2sp(xpl0, len, error) 1359 struct sadb_x_policy *xpl0; 1360 size_t len; 1361 int *error; 1362{ 1363 INIT_VNET_IPSEC(curvnet); 1364 struct secpolicy *newsp; 1365 1366 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1367 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1368 1369 if (len != PFKEY_EXTLEN(xpl0)) { 1370 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1371 *error = EINVAL; 1372 return NULL; 1373 } 1374 1375 if ((newsp = KEY_NEWSP()) == NULL) { 1376 *error = ENOBUFS; 1377 return NULL; 1378 } 1379 1380 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1381 newsp->policy = xpl0->sadb_x_policy_type; 1382 1383 /* check policy */ 1384 switch (xpl0->sadb_x_policy_type) { 1385 case IPSEC_POLICY_DISCARD: 1386 case IPSEC_POLICY_NONE: 1387 case IPSEC_POLICY_ENTRUST: 1388 case IPSEC_POLICY_BYPASS: 1389 newsp->req = NULL; 1390 break; 1391 1392 case IPSEC_POLICY_IPSEC: 1393 { 1394 int tlen; 1395 struct sadb_x_ipsecrequest *xisr; 1396 struct ipsecrequest **p_isr = &newsp->req; 1397 1398 /* validity check */ 1399 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1400 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1401 __func__)); 1402 KEY_FREESP(&newsp); 1403 *error = EINVAL; 1404 return NULL; 1405 } 1406 1407 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1408 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1409 1410 while (tlen > 0) { 1411 /* length check */ 1412 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1413 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1414 "length.\n", __func__)); 1415 KEY_FREESP(&newsp); 1416 *error = EINVAL; 1417 return NULL; 1418 } 1419 1420 /* allocate request buffer */ 1421 /* NB: data structure is zero'd */ 1422 *p_isr = ipsec_newisr(); 1423 if ((*p_isr) == NULL) { 1424 ipseclog((LOG_DEBUG, 1425 "%s: No more memory.\n", __func__)); 1426 KEY_FREESP(&newsp); 1427 *error = ENOBUFS; 1428 return NULL; 1429 } 1430 1431 /* set values */ 1432 switch (xisr->sadb_x_ipsecrequest_proto) { 1433 case IPPROTO_ESP: 1434 case IPPROTO_AH: 1435 case IPPROTO_IPCOMP: 1436 break; 1437 default: 1438 ipseclog((LOG_DEBUG, 1439 "%s: invalid proto type=%u\n", __func__, 1440 xisr->sadb_x_ipsecrequest_proto)); 1441 KEY_FREESP(&newsp); 1442 *error = EPROTONOSUPPORT; 1443 return NULL; 1444 } 1445 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1446 1447 switch (xisr->sadb_x_ipsecrequest_mode) { 1448 case IPSEC_MODE_TRANSPORT: 1449 case IPSEC_MODE_TUNNEL: 1450 break; 1451 case IPSEC_MODE_ANY: 1452 default: 1453 ipseclog((LOG_DEBUG, 1454 "%s: invalid mode=%u\n", __func__, 1455 xisr->sadb_x_ipsecrequest_mode)); 1456 KEY_FREESP(&newsp); 1457 *error = EINVAL; 1458 return NULL; 1459 } 1460 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1461 1462 switch (xisr->sadb_x_ipsecrequest_level) { 1463 case IPSEC_LEVEL_DEFAULT: 1464 case IPSEC_LEVEL_USE: 1465 case IPSEC_LEVEL_REQUIRE: 1466 break; 1467 case IPSEC_LEVEL_UNIQUE: 1468 /* validity check */ 1469 /* 1470 * If range violation of reqid, kernel will 1471 * update it, don't refuse it. 1472 */ 1473 if (xisr->sadb_x_ipsecrequest_reqid 1474 > IPSEC_MANUAL_REQID_MAX) { 1475 ipseclog((LOG_DEBUG, 1476 "%s: reqid=%d range " 1477 "violation, updated by kernel.\n", 1478 __func__, 1479 xisr->sadb_x_ipsecrequest_reqid)); 1480 xisr->sadb_x_ipsecrequest_reqid = 0; 1481 } 1482 1483 /* allocate new reqid id if reqid is zero. */ 1484 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1485 u_int32_t reqid; 1486 if ((reqid = key_newreqid()) == 0) { 1487 KEY_FREESP(&newsp); 1488 *error = ENOBUFS; 1489 return NULL; 1490 } 1491 (*p_isr)->saidx.reqid = reqid; 1492 xisr->sadb_x_ipsecrequest_reqid = reqid; 1493 } else { 1494 /* set it for manual keying. */ 1495 (*p_isr)->saidx.reqid = 1496 xisr->sadb_x_ipsecrequest_reqid; 1497 } 1498 break; 1499 1500 default: 1501 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1502 __func__, 1503 xisr->sadb_x_ipsecrequest_level)); 1504 KEY_FREESP(&newsp); 1505 *error = EINVAL; 1506 return NULL; 1507 } 1508 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1509 1510 /* set IP addresses if there */ 1511 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1512 struct sockaddr *paddr; 1513 1514 paddr = (struct sockaddr *)(xisr + 1); 1515 1516 /* validity check */ 1517 if (paddr->sa_len 1518 > sizeof((*p_isr)->saidx.src)) { 1519 ipseclog((LOG_DEBUG, "%s: invalid " 1520 "request address length.\n", 1521 __func__)); 1522 KEY_FREESP(&newsp); 1523 *error = EINVAL; 1524 return NULL; 1525 } 1526 bcopy(paddr, &(*p_isr)->saidx.src, 1527 paddr->sa_len); 1528 1529 paddr = (struct sockaddr *)((caddr_t)paddr 1530 + paddr->sa_len); 1531 1532 /* validity check */ 1533 if (paddr->sa_len 1534 > sizeof((*p_isr)->saidx.dst)) { 1535 ipseclog((LOG_DEBUG, "%s: invalid " 1536 "request address length.\n", 1537 __func__)); 1538 KEY_FREESP(&newsp); 1539 *error = EINVAL; 1540 return NULL; 1541 } 1542 bcopy(paddr, &(*p_isr)->saidx.dst, 1543 paddr->sa_len); 1544 } 1545 1546 (*p_isr)->sp = newsp; 1547 1548 /* initialization for the next. */ 1549 p_isr = &(*p_isr)->next; 1550 tlen -= xisr->sadb_x_ipsecrequest_len; 1551 1552 /* validity check */ 1553 if (tlen < 0) { 1554 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1555 __func__)); 1556 KEY_FREESP(&newsp); 1557 *error = EINVAL; 1558 return NULL; 1559 } 1560 1561 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1562 + xisr->sadb_x_ipsecrequest_len); 1563 } 1564 } 1565 break; 1566 default: 1567 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1568 KEY_FREESP(&newsp); 1569 *error = EINVAL; 1570 return NULL; 1571 } 1572 1573 *error = 0; 1574 return newsp; 1575} 1576 1577static u_int32_t 1578key_newreqid() 1579{ 1580 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1581 1582 auto_reqid = (auto_reqid == ~0 1583 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1584 1585 /* XXX should be unique check */ 1586 1587 return auto_reqid; 1588} 1589 1590/* 1591 * copy secpolicy struct to sadb_x_policy structure indicated. 1592 */ 1593struct mbuf * 1594key_sp2msg(sp) 1595 struct secpolicy *sp; 1596{ 1597 struct sadb_x_policy *xpl; 1598 int tlen; 1599 caddr_t p; 1600 struct mbuf *m; 1601 1602 IPSEC_ASSERT(sp != NULL, ("null policy")); 1603 1604 tlen = key_getspreqmsglen(sp); 1605 1606 m = key_alloc_mbuf(tlen); 1607 if (!m || m->m_next) { /*XXX*/ 1608 if (m) 1609 m_freem(m); 1610 return NULL; 1611 } 1612 1613 m->m_len = tlen; 1614 m->m_next = NULL; 1615 xpl = mtod(m, struct sadb_x_policy *); 1616 bzero(xpl, tlen); 1617 1618 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1619 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1620 xpl->sadb_x_policy_type = sp->policy; 1621 xpl->sadb_x_policy_dir = sp->spidx.dir; 1622 xpl->sadb_x_policy_id = sp->id; 1623 p = (caddr_t)xpl + sizeof(*xpl); 1624 1625 /* if is the policy for ipsec ? */ 1626 if (sp->policy == IPSEC_POLICY_IPSEC) { 1627 struct sadb_x_ipsecrequest *xisr; 1628 struct ipsecrequest *isr; 1629 1630 for (isr = sp->req; isr != NULL; isr = isr->next) { 1631 1632 xisr = (struct sadb_x_ipsecrequest *)p; 1633 1634 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1635 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1636 xisr->sadb_x_ipsecrequest_level = isr->level; 1637 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1638 1639 p += sizeof(*xisr); 1640 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1641 p += isr->saidx.src.sa.sa_len; 1642 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1643 p += isr->saidx.src.sa.sa_len; 1644 1645 xisr->sadb_x_ipsecrequest_len = 1646 PFKEY_ALIGN8(sizeof(*xisr) 1647 + isr->saidx.src.sa.sa_len 1648 + isr->saidx.dst.sa.sa_len); 1649 } 1650 } 1651 1652 return m; 1653} 1654 1655/* m will not be freed nor modified */ 1656static struct mbuf * 1657#ifdef __STDC__ 1658key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1659 int ndeep, int nitem, ...) 1660#else 1661key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1662 struct mbuf *m; 1663 const struct sadb_msghdr *mhp; 1664 int ndeep; 1665 int nitem; 1666 va_dcl 1667#endif 1668{ 1669 va_list ap; 1670 int idx; 1671 int i; 1672 struct mbuf *result = NULL, *n; 1673 int len; 1674 1675 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1676 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1677 1678 va_start(ap, nitem); 1679 for (i = 0; i < nitem; i++) { 1680 idx = va_arg(ap, int); 1681 if (idx < 0 || idx > SADB_EXT_MAX) 1682 goto fail; 1683 /* don't attempt to pull empty extension */ 1684 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1685 continue; 1686 if (idx != SADB_EXT_RESERVED && 1687 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1688 continue; 1689 1690 if (idx == SADB_EXT_RESERVED) { 1691 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1692 1693 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1694 1695 MGETHDR(n, M_DONTWAIT, MT_DATA); 1696 if (!n) 1697 goto fail; 1698 n->m_len = len; 1699 n->m_next = NULL; 1700 m_copydata(m, 0, sizeof(struct sadb_msg), 1701 mtod(n, caddr_t)); 1702 } else if (i < ndeep) { 1703 len = mhp->extlen[idx]; 1704 n = key_alloc_mbuf(len); 1705 if (!n || n->m_next) { /*XXX*/ 1706 if (n) 1707 m_freem(n); 1708 goto fail; 1709 } 1710 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1711 mtod(n, caddr_t)); 1712 } else { 1713 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1714 M_DONTWAIT); 1715 } 1716 if (n == NULL) 1717 goto fail; 1718 1719 if (result) 1720 m_cat(result, n); 1721 else 1722 result = n; 1723 } 1724 va_end(ap); 1725 1726 if ((result->m_flags & M_PKTHDR) != 0) { 1727 result->m_pkthdr.len = 0; 1728 for (n = result; n; n = n->m_next) 1729 result->m_pkthdr.len += n->m_len; 1730 } 1731 1732 return result; 1733 1734fail: 1735 m_freem(result); 1736 return NULL; 1737} 1738 1739/* 1740 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1741 * add an entry to SP database, when received 1742 * <base, address(SD), (lifetime(H),) policy> 1743 * from the user(?). 1744 * Adding to SP database, 1745 * and send 1746 * <base, address(SD), (lifetime(H),) policy> 1747 * to the socket which was send. 1748 * 1749 * SPDADD set a unique policy entry. 1750 * SPDSETIDX like SPDADD without a part of policy requests. 1751 * SPDUPDATE replace a unique policy entry. 1752 * 1753 * m will always be freed. 1754 */ 1755static int 1756key_spdadd(so, m, mhp) 1757 struct socket *so; 1758 struct mbuf *m; 1759 const struct sadb_msghdr *mhp; 1760{ 1761 INIT_VNET_IPSEC(curvnet); 1762 struct sadb_address *src0, *dst0; 1763 struct sadb_x_policy *xpl0, *xpl; 1764 struct sadb_lifetime *lft = NULL; 1765 struct secpolicyindex spidx; 1766 struct secpolicy *newsp; 1767 int error; 1768 1769 IPSEC_ASSERT(so != NULL, ("null socket")); 1770 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1771 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1772 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1773 1774 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1775 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1776 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1777 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1778 return key_senderror(so, m, EINVAL); 1779 } 1780 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1781 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1782 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1783 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1784 __func__)); 1785 return key_senderror(so, m, EINVAL); 1786 } 1787 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1788 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1789 < sizeof(struct sadb_lifetime)) { 1790 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1791 __func__)); 1792 return key_senderror(so, m, EINVAL); 1793 } 1794 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1795 } 1796 1797 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1798 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1799 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1800 1801 /* make secindex */ 1802 /* XXX boundary check against sa_len */ 1803 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1804 src0 + 1, 1805 dst0 + 1, 1806 src0->sadb_address_prefixlen, 1807 dst0->sadb_address_prefixlen, 1808 src0->sadb_address_proto, 1809 &spidx); 1810 1811 /* checking the direciton. */ 1812 switch (xpl0->sadb_x_policy_dir) { 1813 case IPSEC_DIR_INBOUND: 1814 case IPSEC_DIR_OUTBOUND: 1815 break; 1816 default: 1817 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1818 mhp->msg->sadb_msg_errno = EINVAL; 1819 return 0; 1820 } 1821 1822 /* check policy */ 1823 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1824 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1825 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1826 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1827 return key_senderror(so, m, EINVAL); 1828 } 1829 1830 /* policy requests are mandatory when action is ipsec. */ 1831 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1832 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1833 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1834 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1835 __func__)); 1836 return key_senderror(so, m, EINVAL); 1837 } 1838 1839 /* 1840 * checking there is SP already or not. 1841 * SPDUPDATE doesn't depend on whether there is a SP or not. 1842 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1843 * then error. 1844 */ 1845 newsp = key_getsp(&spidx); 1846 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1847 if (newsp) { 1848 newsp->state = IPSEC_SPSTATE_DEAD; 1849 KEY_FREESP(&newsp); 1850 } 1851 } else { 1852 if (newsp != NULL) { 1853 KEY_FREESP(&newsp); 1854 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1855 __func__)); 1856 return key_senderror(so, m, EEXIST); 1857 } 1858 } 1859 1860 /* allocation new SP entry */ 1861 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1862 return key_senderror(so, m, error); 1863 } 1864 1865 if ((newsp->id = key_getnewspid()) == 0) { 1866 _key_delsp(newsp); 1867 return key_senderror(so, m, ENOBUFS); 1868 } 1869 1870 /* XXX boundary check against sa_len */ 1871 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1872 src0 + 1, 1873 dst0 + 1, 1874 src0->sadb_address_prefixlen, 1875 dst0->sadb_address_prefixlen, 1876 src0->sadb_address_proto, 1877 &newsp->spidx); 1878 1879 /* sanity check on addr pair */ 1880 if (((struct sockaddr *)(src0 + 1))->sa_family != 1881 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1882 _key_delsp(newsp); 1883 return key_senderror(so, m, EINVAL); 1884 } 1885 if (((struct sockaddr *)(src0 + 1))->sa_len != 1886 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1887 _key_delsp(newsp); 1888 return key_senderror(so, m, EINVAL); 1889 } 1890#if 1 1891 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1892 struct sockaddr *sa; 1893 sa = (struct sockaddr *)(src0 + 1); 1894 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1895 _key_delsp(newsp); 1896 return key_senderror(so, m, EINVAL); 1897 } 1898 } 1899 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1900 struct sockaddr *sa; 1901 sa = (struct sockaddr *)(dst0 + 1); 1902 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1903 _key_delsp(newsp); 1904 return key_senderror(so, m, EINVAL); 1905 } 1906 } 1907#endif 1908 1909 newsp->created = time_second; 1910 newsp->lastused = newsp->created; 1911 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1912 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1913 1914 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1915 newsp->state = IPSEC_SPSTATE_ALIVE; 1916 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1917 1918 /* delete the entry in spacqtree */ 1919 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1920 struct secspacq *spacq = key_getspacq(&spidx); 1921 if (spacq != NULL) { 1922 /* reset counter in order to deletion by timehandler. */ 1923 spacq->created = time_second; 1924 spacq->count = 0; 1925 SPACQ_UNLOCK(); 1926 } 1927 } 1928 1929 { 1930 struct mbuf *n, *mpolicy; 1931 struct sadb_msg *newmsg; 1932 int off; 1933 1934 /* create new sadb_msg to reply. */ 1935 if (lft) { 1936 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1937 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1938 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1939 } else { 1940 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1941 SADB_X_EXT_POLICY, 1942 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1943 } 1944 if (!n) 1945 return key_senderror(so, m, ENOBUFS); 1946 1947 if (n->m_len < sizeof(*newmsg)) { 1948 n = m_pullup(n, sizeof(*newmsg)); 1949 if (!n) 1950 return key_senderror(so, m, ENOBUFS); 1951 } 1952 newmsg = mtod(n, struct sadb_msg *); 1953 newmsg->sadb_msg_errno = 0; 1954 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1955 1956 off = 0; 1957 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1958 sizeof(*xpl), &off); 1959 if (mpolicy == NULL) { 1960 /* n is already freed */ 1961 return key_senderror(so, m, ENOBUFS); 1962 } 1963 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1964 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1965 m_freem(n); 1966 return key_senderror(so, m, EINVAL); 1967 } 1968 xpl->sadb_x_policy_id = newsp->id; 1969 1970 m_freem(m); 1971 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1972 } 1973} 1974 1975/* 1976 * get new policy id. 1977 * OUT: 1978 * 0: failure. 1979 * others: success. 1980 */ 1981static u_int32_t 1982key_getnewspid() 1983{ 1984 INIT_VNET_IPSEC(curvnet); 1985 u_int32_t newid = 0; 1986 int count = V_key_spi_trycnt; /* XXX */ 1987 struct secpolicy *sp; 1988 1989 /* when requesting to allocate spi ranged */ 1990 while (count--) { 1991 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1992 1993 if ((sp = key_getspbyid(newid)) == NULL) 1994 break; 1995 1996 KEY_FREESP(&sp); 1997 } 1998 1999 if (count == 0 || newid == 0) { 2000 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 2001 __func__)); 2002 return 0; 2003 } 2004 2005 return newid; 2006} 2007 2008/* 2009 * SADB_SPDDELETE processing 2010 * receive 2011 * <base, address(SD), policy(*)> 2012 * from the user(?), and set SADB_SASTATE_DEAD, 2013 * and send, 2014 * <base, address(SD), policy(*)> 2015 * to the ikmpd. 2016 * policy(*) including direction of policy. 2017 * 2018 * m will always be freed. 2019 */ 2020static int 2021key_spddelete(so, m, mhp) 2022 struct socket *so; 2023 struct mbuf *m; 2024 const struct sadb_msghdr *mhp; 2025{ 2026 INIT_VNET_IPSEC(curvnet); 2027 struct sadb_address *src0, *dst0; 2028 struct sadb_x_policy *xpl0; 2029 struct secpolicyindex spidx; 2030 struct secpolicy *sp; 2031 2032 IPSEC_ASSERT(so != NULL, ("null so")); 2033 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2034 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2035 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2036 2037 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2038 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2039 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2040 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2041 __func__)); 2042 return key_senderror(so, m, EINVAL); 2043 } 2044 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2045 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2046 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2047 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2048 __func__)); 2049 return key_senderror(so, m, EINVAL); 2050 } 2051 2052 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2053 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2054 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2055 2056 /* make secindex */ 2057 /* XXX boundary check against sa_len */ 2058 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2059 src0 + 1, 2060 dst0 + 1, 2061 src0->sadb_address_prefixlen, 2062 dst0->sadb_address_prefixlen, 2063 src0->sadb_address_proto, 2064 &spidx); 2065 2066 /* checking the direciton. */ 2067 switch (xpl0->sadb_x_policy_dir) { 2068 case IPSEC_DIR_INBOUND: 2069 case IPSEC_DIR_OUTBOUND: 2070 break; 2071 default: 2072 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2073 return key_senderror(so, m, EINVAL); 2074 } 2075 2076 /* Is there SP in SPD ? */ 2077 if ((sp = key_getsp(&spidx)) == NULL) { 2078 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2079 return key_senderror(so, m, EINVAL); 2080 } 2081 2082 /* save policy id to buffer to be returned. */ 2083 xpl0->sadb_x_policy_id = sp->id; 2084 2085 sp->state = IPSEC_SPSTATE_DEAD; 2086 KEY_FREESP(&sp); 2087 2088 { 2089 struct mbuf *n; 2090 struct sadb_msg *newmsg; 2091 2092 /* create new sadb_msg to reply. */ 2093 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2094 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2095 if (!n) 2096 return key_senderror(so, m, ENOBUFS); 2097 2098 newmsg = mtod(n, struct sadb_msg *); 2099 newmsg->sadb_msg_errno = 0; 2100 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2101 2102 m_freem(m); 2103 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2104 } 2105} 2106 2107/* 2108 * SADB_SPDDELETE2 processing 2109 * receive 2110 * <base, policy(*)> 2111 * from the user(?), and set SADB_SASTATE_DEAD, 2112 * and send, 2113 * <base, policy(*)> 2114 * to the ikmpd. 2115 * policy(*) including direction of policy. 2116 * 2117 * m will always be freed. 2118 */ 2119static int 2120key_spddelete2(so, m, mhp) 2121 struct socket *so; 2122 struct mbuf *m; 2123 const struct sadb_msghdr *mhp; 2124{ 2125 INIT_VNET_IPSEC(curvnet); 2126 u_int32_t id; 2127 struct secpolicy *sp; 2128 2129 IPSEC_ASSERT(so != NULL, ("null socket")); 2130 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2131 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2132 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2133 2134 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2135 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2136 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2137 return key_senderror(so, m, EINVAL); 2138 } 2139 2140 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2141 2142 /* Is there SP in SPD ? */ 2143 if ((sp = key_getspbyid(id)) == NULL) { 2144 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2145 return key_senderror(so, m, EINVAL); 2146 } 2147 2148 sp->state = IPSEC_SPSTATE_DEAD; 2149 KEY_FREESP(&sp); 2150 2151 { 2152 struct mbuf *n, *nn; 2153 struct sadb_msg *newmsg; 2154 int off, len; 2155 2156 /* create new sadb_msg to reply. */ 2157 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2158 2159 MGETHDR(n, M_DONTWAIT, MT_DATA); 2160 if (n && len > MHLEN) { 2161 MCLGET(n, M_DONTWAIT); 2162 if ((n->m_flags & M_EXT) == 0) { 2163 m_freem(n); 2164 n = NULL; 2165 } 2166 } 2167 if (!n) 2168 return key_senderror(so, m, ENOBUFS); 2169 2170 n->m_len = len; 2171 n->m_next = NULL; 2172 off = 0; 2173 2174 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2175 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2176 2177 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2178 off, len)); 2179 2180 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2181 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2182 if (!n->m_next) { 2183 m_freem(n); 2184 return key_senderror(so, m, ENOBUFS); 2185 } 2186 2187 n->m_pkthdr.len = 0; 2188 for (nn = n; nn; nn = nn->m_next) 2189 n->m_pkthdr.len += nn->m_len; 2190 2191 newmsg = mtod(n, struct sadb_msg *); 2192 newmsg->sadb_msg_errno = 0; 2193 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2194 2195 m_freem(m); 2196 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2197 } 2198} 2199 2200/* 2201 * SADB_X_GET processing 2202 * receive 2203 * <base, policy(*)> 2204 * from the user(?), 2205 * and send, 2206 * <base, address(SD), policy> 2207 * to the ikmpd. 2208 * policy(*) including direction of policy. 2209 * 2210 * m will always be freed. 2211 */ 2212static int 2213key_spdget(so, m, mhp) 2214 struct socket *so; 2215 struct mbuf *m; 2216 const struct sadb_msghdr *mhp; 2217{ 2218 INIT_VNET_IPSEC(curvnet); 2219 u_int32_t id; 2220 struct secpolicy *sp; 2221 struct mbuf *n; 2222 2223 IPSEC_ASSERT(so != NULL, ("null socket")); 2224 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2225 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2226 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2227 2228 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2229 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2230 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2231 __func__)); 2232 return key_senderror(so, m, EINVAL); 2233 } 2234 2235 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2236 2237 /* Is there SP in SPD ? */ 2238 if ((sp = key_getspbyid(id)) == NULL) { 2239 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2240 return key_senderror(so, m, ENOENT); 2241 } 2242 2243 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2244 if (n != NULL) { 2245 m_freem(m); 2246 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2247 } else 2248 return key_senderror(so, m, ENOBUFS); 2249} 2250 2251/* 2252 * SADB_X_SPDACQUIRE processing. 2253 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2254 * send 2255 * <base, policy(*)> 2256 * to KMD, and expect to receive 2257 * <base> with SADB_X_SPDACQUIRE if error occured, 2258 * or 2259 * <base, policy> 2260 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2261 * policy(*) is without policy requests. 2262 * 2263 * 0 : succeed 2264 * others: error number 2265 */ 2266int 2267key_spdacquire(sp) 2268 struct secpolicy *sp; 2269{ 2270 INIT_VNET_IPSEC(curvnet); 2271 struct mbuf *result = NULL, *m; 2272 struct secspacq *newspacq; 2273 2274 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2275 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2276 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2277 ("policy not IPSEC %u", sp->policy)); 2278 2279 /* Get an entry to check whether sent message or not. */ 2280 newspacq = key_getspacq(&sp->spidx); 2281 if (newspacq != NULL) { 2282 if (V_key_blockacq_count < newspacq->count) { 2283 /* reset counter and do send message. */ 2284 newspacq->count = 0; 2285 } else { 2286 /* increment counter and do nothing. */ 2287 newspacq->count++; 2288 return 0; 2289 } 2290 SPACQ_UNLOCK(); 2291 } else { 2292 /* make new entry for blocking to send SADB_ACQUIRE. */ 2293 newspacq = key_newspacq(&sp->spidx); 2294 if (newspacq == NULL) 2295 return ENOBUFS; 2296 } 2297 2298 /* create new sadb_msg to reply. */ 2299 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2300 if (!m) 2301 return ENOBUFS; 2302 2303 result = m; 2304 2305 result->m_pkthdr.len = 0; 2306 for (m = result; m; m = m->m_next) 2307 result->m_pkthdr.len += m->m_len; 2308 2309 mtod(result, struct sadb_msg *)->sadb_msg_len = 2310 PFKEY_UNIT64(result->m_pkthdr.len); 2311 2312 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2313} 2314 2315/* 2316 * SADB_SPDFLUSH processing 2317 * receive 2318 * <base> 2319 * from the user, and free all entries in secpctree. 2320 * and send, 2321 * <base> 2322 * to the user. 2323 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2324 * 2325 * m will always be freed. 2326 */ 2327static int 2328key_spdflush(so, m, mhp) 2329 struct socket *so; 2330 struct mbuf *m; 2331 const struct sadb_msghdr *mhp; 2332{ 2333 INIT_VNET_IPSEC(curvnet); 2334 struct sadb_msg *newmsg; 2335 struct secpolicy *sp; 2336 u_int dir; 2337 2338 IPSEC_ASSERT(so != NULL, ("null socket")); 2339 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2340 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2341 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2342 2343 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2344 return key_senderror(so, m, EINVAL); 2345 2346 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2347 SPTREE_LOCK(); 2348 LIST_FOREACH(sp, &V_sptree[dir], chain) 2349 sp->state = IPSEC_SPSTATE_DEAD; 2350 SPTREE_UNLOCK(); 2351 } 2352 2353 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2354 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2355 return key_senderror(so, m, ENOBUFS); 2356 } 2357 2358 if (m->m_next) 2359 m_freem(m->m_next); 2360 m->m_next = NULL; 2361 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2362 newmsg = mtod(m, struct sadb_msg *); 2363 newmsg->sadb_msg_errno = 0; 2364 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2365 2366 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2367} 2368 2369/* 2370 * SADB_SPDDUMP processing 2371 * receive 2372 * <base> 2373 * from the user, and dump all SP leaves 2374 * and send, 2375 * <base> ..... 2376 * to the ikmpd. 2377 * 2378 * m will always be freed. 2379 */ 2380static int 2381key_spddump(so, m, mhp) 2382 struct socket *so; 2383 struct mbuf *m; 2384 const struct sadb_msghdr *mhp; 2385{ 2386 INIT_VNET_IPSEC(curvnet); 2387 struct secpolicy *sp; 2388 int cnt; 2389 u_int dir; 2390 struct mbuf *n; 2391 2392 IPSEC_ASSERT(so != NULL, ("null socket")); 2393 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2394 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2395 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2396 2397 /* search SPD entry and get buffer size. */ 2398 cnt = 0; 2399 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2400 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2401 cnt++; 2402 } 2403 } 2404 2405 if (cnt == 0) 2406 return key_senderror(so, m, ENOENT); 2407 2408 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2409 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2410 --cnt; 2411 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2412 mhp->msg->sadb_msg_pid); 2413 2414 if (n) 2415 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2416 } 2417 } 2418 2419 m_freem(m); 2420 return 0; 2421} 2422 2423static struct mbuf * 2424key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2425{ 2426 struct mbuf *result = NULL, *m; 2427 struct seclifetime lt; 2428 2429 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2430 if (!m) 2431 goto fail; 2432 result = m; 2433 2434 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2435 &sp->spidx.src.sa, sp->spidx.prefs, 2436 sp->spidx.ul_proto); 2437 if (!m) 2438 goto fail; 2439 m_cat(result, m); 2440 2441 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2442 &sp->spidx.dst.sa, sp->spidx.prefd, 2443 sp->spidx.ul_proto); 2444 if (!m) 2445 goto fail; 2446 m_cat(result, m); 2447 2448 m = key_sp2msg(sp); 2449 if (!m) 2450 goto fail; 2451 m_cat(result, m); 2452 2453 if(sp->lifetime){ 2454 lt.addtime=sp->created; 2455 lt.usetime= sp->lastused; 2456 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2457 if (!m) 2458 goto fail; 2459 m_cat(result, m); 2460 2461 lt.addtime=sp->lifetime; 2462 lt.usetime= sp->validtime; 2463 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2464 if (!m) 2465 goto fail; 2466 m_cat(result, m); 2467 } 2468 2469 if ((result->m_flags & M_PKTHDR) == 0) 2470 goto fail; 2471 2472 if (result->m_len < sizeof(struct sadb_msg)) { 2473 result = m_pullup(result, sizeof(struct sadb_msg)); 2474 if (result == NULL) 2475 goto fail; 2476 } 2477 2478 result->m_pkthdr.len = 0; 2479 for (m = result; m; m = m->m_next) 2480 result->m_pkthdr.len += m->m_len; 2481 2482 mtod(result, struct sadb_msg *)->sadb_msg_len = 2483 PFKEY_UNIT64(result->m_pkthdr.len); 2484 2485 return result; 2486 2487fail: 2488 m_freem(result); 2489 return NULL; 2490} 2491 2492/* 2493 * get PFKEY message length for security policy and request. 2494 */ 2495static u_int 2496key_getspreqmsglen(sp) 2497 struct secpolicy *sp; 2498{ 2499 u_int tlen; 2500 2501 tlen = sizeof(struct sadb_x_policy); 2502 2503 /* if is the policy for ipsec ? */ 2504 if (sp->policy != IPSEC_POLICY_IPSEC) 2505 return tlen; 2506 2507 /* get length of ipsec requests */ 2508 { 2509 struct ipsecrequest *isr; 2510 int len; 2511 2512 for (isr = sp->req; isr != NULL; isr = isr->next) { 2513 len = sizeof(struct sadb_x_ipsecrequest) 2514 + isr->saidx.src.sa.sa_len 2515 + isr->saidx.dst.sa.sa_len; 2516 2517 tlen += PFKEY_ALIGN8(len); 2518 } 2519 } 2520 2521 return tlen; 2522} 2523 2524/* 2525 * SADB_SPDEXPIRE processing 2526 * send 2527 * <base, address(SD), lifetime(CH), policy> 2528 * to KMD by PF_KEY. 2529 * 2530 * OUT: 0 : succeed 2531 * others : error number 2532 */ 2533static int 2534key_spdexpire(sp) 2535 struct secpolicy *sp; 2536{ 2537 struct mbuf *result = NULL, *m; 2538 int len; 2539 int error = -1; 2540 struct sadb_lifetime *lt; 2541 2542 /* XXX: Why do we lock ? */ 2543 2544 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2545 2546 /* set msg header */ 2547 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2548 if (!m) { 2549 error = ENOBUFS; 2550 goto fail; 2551 } 2552 result = m; 2553 2554 /* create lifetime extension (current and hard) */ 2555 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2556 m = key_alloc_mbuf(len); 2557 if (!m || m->m_next) { /*XXX*/ 2558 if (m) 2559 m_freem(m); 2560 error = ENOBUFS; 2561 goto fail; 2562 } 2563 bzero(mtod(m, caddr_t), len); 2564 lt = mtod(m, struct sadb_lifetime *); 2565 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2566 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2567 lt->sadb_lifetime_allocations = 0; 2568 lt->sadb_lifetime_bytes = 0; 2569 lt->sadb_lifetime_addtime = sp->created; 2570 lt->sadb_lifetime_usetime = sp->lastused; 2571 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2572 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2573 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2574 lt->sadb_lifetime_allocations = 0; 2575 lt->sadb_lifetime_bytes = 0; 2576 lt->sadb_lifetime_addtime = sp->lifetime; 2577 lt->sadb_lifetime_usetime = sp->validtime; 2578 m_cat(result, m); 2579 2580 /* set sadb_address for source */ 2581 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2582 &sp->spidx.src.sa, 2583 sp->spidx.prefs, sp->spidx.ul_proto); 2584 if (!m) { 2585 error = ENOBUFS; 2586 goto fail; 2587 } 2588 m_cat(result, m); 2589 2590 /* set sadb_address for destination */ 2591 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2592 &sp->spidx.dst.sa, 2593 sp->spidx.prefd, sp->spidx.ul_proto); 2594 if (!m) { 2595 error = ENOBUFS; 2596 goto fail; 2597 } 2598 m_cat(result, m); 2599 2600 /* set secpolicy */ 2601 m = key_sp2msg(sp); 2602 if (!m) { 2603 error = ENOBUFS; 2604 goto fail; 2605 } 2606 m_cat(result, m); 2607 2608 if ((result->m_flags & M_PKTHDR) == 0) { 2609 error = EINVAL; 2610 goto fail; 2611 } 2612 2613 if (result->m_len < sizeof(struct sadb_msg)) { 2614 result = m_pullup(result, sizeof(struct sadb_msg)); 2615 if (result == NULL) { 2616 error = ENOBUFS; 2617 goto fail; 2618 } 2619 } 2620 2621 result->m_pkthdr.len = 0; 2622 for (m = result; m; m = m->m_next) 2623 result->m_pkthdr.len += m->m_len; 2624 2625 mtod(result, struct sadb_msg *)->sadb_msg_len = 2626 PFKEY_UNIT64(result->m_pkthdr.len); 2627 2628 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2629 2630 fail: 2631 if (result) 2632 m_freem(result); 2633 return error; 2634} 2635 2636/* %%% SAD management */ 2637/* 2638 * allocating a memory for new SA head, and copy from the values of mhp. 2639 * OUT: NULL : failure due to the lack of memory. 2640 * others : pointer to new SA head. 2641 */ 2642static struct secashead * 2643key_newsah(saidx) 2644 struct secasindex *saidx; 2645{ 2646 INIT_VNET_IPSEC(curvnet); 2647 struct secashead *newsah; 2648 2649 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2650 2651 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2652 if (newsah != NULL) { 2653 int i; 2654 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2655 LIST_INIT(&newsah->savtree[i]); 2656 newsah->saidx = *saidx; 2657 2658 /* add to saidxtree */ 2659 newsah->state = SADB_SASTATE_MATURE; 2660 2661 SAHTREE_LOCK(); 2662 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2663 SAHTREE_UNLOCK(); 2664 } 2665 return(newsah); 2666} 2667 2668/* 2669 * delete SA index and all SA registerd. 2670 */ 2671static void 2672key_delsah(sah) 2673 struct secashead *sah; 2674{ 2675 INIT_VNET_IPSEC(curvnet); 2676 struct secasvar *sav, *nextsav; 2677 u_int stateidx; 2678 int zombie = 0; 2679 2680 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2681 SAHTREE_LOCK_ASSERT(); 2682 2683 /* searching all SA registerd in the secindex. */ 2684 for (stateidx = 0; 2685 stateidx < _ARRAYLEN(saorder_state_any); 2686 stateidx++) { 2687 u_int state = saorder_state_any[stateidx]; 2688 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2689 if (sav->refcnt == 0) { 2690 /* sanity check */ 2691 KEY_CHKSASTATE(state, sav->state, __func__); 2692 /* 2693 * do NOT call KEY_FREESAV here: 2694 * it will only delete the sav if refcnt == 1, 2695 * where we already know that refcnt == 0 2696 */ 2697 key_delsav(sav); 2698 } else { 2699 /* give up to delete this sa */ 2700 zombie++; 2701 } 2702 } 2703 } 2704 if (!zombie) { /* delete only if there are savs */ 2705 /* remove from tree of SA index */ 2706 if (__LIST_CHAINED(sah)) 2707 LIST_REMOVE(sah, chain); 2708 if (sah->sa_route.ro_rt) { 2709 RTFREE(sah->sa_route.ro_rt); 2710 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2711 } 2712 free(sah, M_IPSEC_SAH); 2713 } 2714} 2715 2716/* 2717 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2718 * and copy the values of mhp into new buffer. 2719 * When SAD message type is GETSPI: 2720 * to set sequence number from acq_seq++, 2721 * to set zero to SPI. 2722 * not to call key_setsava(). 2723 * OUT: NULL : fail 2724 * others : pointer to new secasvar. 2725 * 2726 * does not modify mbuf. does not free mbuf on error. 2727 */ 2728static struct secasvar * 2729key_newsav(m, mhp, sah, errp, where, tag) 2730 struct mbuf *m; 2731 const struct sadb_msghdr *mhp; 2732 struct secashead *sah; 2733 int *errp; 2734 const char* where; 2735 int tag; 2736{ 2737 INIT_VNET_IPSEC(curvnet); 2738 struct secasvar *newsav; 2739 const struct sadb_sa *xsa; 2740 2741 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2742 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2743 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2744 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2745 2746 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2747 if (newsav == NULL) { 2748 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2749 *errp = ENOBUFS; 2750 goto done; 2751 } 2752 2753 switch (mhp->msg->sadb_msg_type) { 2754 case SADB_GETSPI: 2755 newsav->spi = 0; 2756 2757#ifdef IPSEC_DOSEQCHECK 2758 /* sync sequence number */ 2759 if (mhp->msg->sadb_msg_seq == 0) 2760 newsav->seq = 2761 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2762 else 2763#endif 2764 newsav->seq = mhp->msg->sadb_msg_seq; 2765 break; 2766 2767 case SADB_ADD: 2768 /* sanity check */ 2769 if (mhp->ext[SADB_EXT_SA] == NULL) { 2770 free(newsav, M_IPSEC_SA); 2771 newsav = NULL; 2772 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2773 __func__)); 2774 *errp = EINVAL; 2775 goto done; 2776 } 2777 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2778 newsav->spi = xsa->sadb_sa_spi; 2779 newsav->seq = mhp->msg->sadb_msg_seq; 2780 break; 2781 default: 2782 free(newsav, M_IPSEC_SA); 2783 newsav = NULL; 2784 *errp = EINVAL; 2785 goto done; 2786 } 2787 2788 2789 /* copy sav values */ 2790 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2791 *errp = key_setsaval(newsav, m, mhp); 2792 if (*errp) { 2793 free(newsav, M_IPSEC_SA); 2794 newsav = NULL; 2795 goto done; 2796 } 2797 } 2798 2799 SECASVAR_LOCK_INIT(newsav); 2800 2801 /* reset created */ 2802 newsav->created = time_second; 2803 newsav->pid = mhp->msg->sadb_msg_pid; 2804 2805 /* add to satree */ 2806 newsav->sah = sah; 2807 sa_initref(newsav); 2808 newsav->state = SADB_SASTATE_LARVAL; 2809 2810 /* XXX locking??? */ 2811 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2812 secasvar, chain); 2813done: 2814 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2815 printf("DP %s from %s:%u return SP:%p\n", __func__, 2816 where, tag, newsav)); 2817 2818 return newsav; 2819} 2820 2821/* 2822 * free() SA variable entry. 2823 */ 2824static void 2825key_cleansav(struct secasvar *sav) 2826{ 2827 /* 2828 * Cleanup xform state. Note that zeroize'ing causes the 2829 * keys to be cleared; otherwise we must do it ourself. 2830 */ 2831 if (sav->tdb_xform != NULL) { 2832 sav->tdb_xform->xf_zeroize(sav); 2833 sav->tdb_xform = NULL; 2834 } else { 2835 KASSERT(sav->iv == NULL, ("iv but no xform")); 2836 if (sav->key_auth != NULL) 2837 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2838 if (sav->key_enc != NULL) 2839 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2840 } 2841 if (sav->key_auth != NULL) { 2842 if (sav->key_auth->key_data != NULL) 2843 free(sav->key_auth->key_data, M_IPSEC_MISC); 2844 free(sav->key_auth, M_IPSEC_MISC); 2845 sav->key_auth = NULL; 2846 } 2847 if (sav->key_enc != NULL) { 2848 if (sav->key_enc->key_data != NULL) 2849 free(sav->key_enc->key_data, M_IPSEC_MISC); 2850 free(sav->key_enc, M_IPSEC_MISC); 2851 sav->key_enc = NULL; 2852 } 2853 if (sav->sched) { 2854 bzero(sav->sched, sav->schedlen); 2855 free(sav->sched, M_IPSEC_MISC); 2856 sav->sched = NULL; 2857 } 2858 if (sav->replay != NULL) { 2859 free(sav->replay, M_IPSEC_MISC); 2860 sav->replay = NULL; 2861 } 2862 if (sav->lft_c != NULL) { 2863 free(sav->lft_c, M_IPSEC_MISC); 2864 sav->lft_c = NULL; 2865 } 2866 if (sav->lft_h != NULL) { 2867 free(sav->lft_h, M_IPSEC_MISC); 2868 sav->lft_h = NULL; 2869 } 2870 if (sav->lft_s != NULL) { 2871 free(sav->lft_s, M_IPSEC_MISC); 2872 sav->lft_s = NULL; 2873 } 2874} 2875 2876/* 2877 * free() SA variable entry. 2878 */ 2879static void 2880key_delsav(sav) 2881 struct secasvar *sav; 2882{ 2883 IPSEC_ASSERT(sav != NULL, ("null sav")); 2884 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2885 2886 /* remove from SA header */ 2887 if (__LIST_CHAINED(sav)) 2888 LIST_REMOVE(sav, chain); 2889 key_cleansav(sav); 2890 SECASVAR_LOCK_DESTROY(sav); 2891 free(sav, M_IPSEC_SA); 2892} 2893 2894/* 2895 * search SAD. 2896 * OUT: 2897 * NULL : not found 2898 * others : found, pointer to a SA. 2899 */ 2900static struct secashead * 2901key_getsah(saidx) 2902 struct secasindex *saidx; 2903{ 2904 INIT_VNET_IPSEC(curvnet); 2905 struct secashead *sah; 2906 2907 SAHTREE_LOCK(); 2908 LIST_FOREACH(sah, &V_sahtree, chain) { 2909 if (sah->state == SADB_SASTATE_DEAD) 2910 continue; 2911 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2912 break; 2913 } 2914 SAHTREE_UNLOCK(); 2915 2916 return sah; 2917} 2918 2919/* 2920 * check not to be duplicated SPI. 2921 * NOTE: this function is too slow due to searching all SAD. 2922 * OUT: 2923 * NULL : not found 2924 * others : found, pointer to a SA. 2925 */ 2926static struct secasvar * 2927key_checkspidup(saidx, spi) 2928 struct secasindex *saidx; 2929 u_int32_t spi; 2930{ 2931 INIT_VNET_IPSEC(curvnet); 2932 struct secashead *sah; 2933 struct secasvar *sav; 2934 2935 /* check address family */ 2936 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2937 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2938 __func__)); 2939 return NULL; 2940 } 2941 2942 sav = NULL; 2943 /* check all SAD */ 2944 SAHTREE_LOCK(); 2945 LIST_FOREACH(sah, &V_sahtree, chain) { 2946 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2947 continue; 2948 sav = key_getsavbyspi(sah, spi); 2949 if (sav != NULL) 2950 break; 2951 } 2952 SAHTREE_UNLOCK(); 2953 2954 return sav; 2955} 2956 2957/* 2958 * search SAD litmited alive SA, protocol, SPI. 2959 * OUT: 2960 * NULL : not found 2961 * others : found, pointer to a SA. 2962 */ 2963static struct secasvar * 2964key_getsavbyspi(sah, spi) 2965 struct secashead *sah; 2966 u_int32_t spi; 2967{ 2968 INIT_VNET_IPSEC(curvnet); 2969 struct secasvar *sav; 2970 u_int stateidx, state; 2971 2972 sav = NULL; 2973 SAHTREE_LOCK_ASSERT(); 2974 /* search all status */ 2975 for (stateidx = 0; 2976 stateidx < _ARRAYLEN(saorder_state_alive); 2977 stateidx++) { 2978 2979 state = saorder_state_alive[stateidx]; 2980 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2981 2982 /* sanity check */ 2983 if (sav->state != state) { 2984 ipseclog((LOG_DEBUG, "%s: " 2985 "invalid sav->state (queue: %d SA: %d)\n", 2986 __func__, state, sav->state)); 2987 continue; 2988 } 2989 2990 if (sav->spi == spi) 2991 return sav; 2992 } 2993 } 2994 2995 return NULL; 2996} 2997 2998/* 2999 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3000 * You must update these if need. 3001 * OUT: 0: success. 3002 * !0: failure. 3003 * 3004 * does not modify mbuf. does not free mbuf on error. 3005 */ 3006static int 3007key_setsaval(sav, m, mhp) 3008 struct secasvar *sav; 3009 struct mbuf *m; 3010 const struct sadb_msghdr *mhp; 3011{ 3012 INIT_VNET_IPSEC(curvnet); 3013 int error = 0; 3014 3015 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3016 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3017 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3018 3019 /* initialization */ 3020 sav->replay = NULL; 3021 sav->key_auth = NULL; 3022 sav->key_enc = NULL; 3023 sav->sched = NULL; 3024 sav->schedlen = 0; 3025 sav->iv = NULL; 3026 sav->lft_c = NULL; 3027 sav->lft_h = NULL; 3028 sav->lft_s = NULL; 3029 sav->tdb_xform = NULL; /* transform */ 3030 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3031 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3032 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3033 3034 /* SA */ 3035 if (mhp->ext[SADB_EXT_SA] != NULL) { 3036 const struct sadb_sa *sa0; 3037 3038 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3039 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3040 error = EINVAL; 3041 goto fail; 3042 } 3043 3044 sav->alg_auth = sa0->sadb_sa_auth; 3045 sav->alg_enc = sa0->sadb_sa_encrypt; 3046 sav->flags = sa0->sadb_sa_flags; 3047 3048 /* replay window */ 3049 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3050 sav->replay = (struct secreplay *) 3051 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3052 if (sav->replay == NULL) { 3053 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3054 __func__)); 3055 error = ENOBUFS; 3056 goto fail; 3057 } 3058 if (sa0->sadb_sa_replay != 0) 3059 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3060 sav->replay->wsize = sa0->sadb_sa_replay; 3061 } 3062 } 3063 3064 /* Authentication keys */ 3065 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3066 const struct sadb_key *key0; 3067 int len; 3068 3069 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3070 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3071 3072 error = 0; 3073 if (len < sizeof(*key0)) { 3074 error = EINVAL; 3075 goto fail; 3076 } 3077 switch (mhp->msg->sadb_msg_satype) { 3078 case SADB_SATYPE_AH: 3079 case SADB_SATYPE_ESP: 3080 case SADB_X_SATYPE_TCPSIGNATURE: 3081 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3082 sav->alg_auth != SADB_X_AALG_NULL) 3083 error = EINVAL; 3084 break; 3085 case SADB_X_SATYPE_IPCOMP: 3086 default: 3087 error = EINVAL; 3088 break; 3089 } 3090 if (error) { 3091 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3092 __func__)); 3093 goto fail; 3094 } 3095 3096 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3097 M_IPSEC_MISC); 3098 if (sav->key_auth == NULL ) { 3099 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3100 __func__)); 3101 error = ENOBUFS; 3102 goto fail; 3103 } 3104 } 3105 3106 /* Encryption key */ 3107 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3108 const struct sadb_key *key0; 3109 int len; 3110 3111 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3112 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3113 3114 error = 0; 3115 if (len < sizeof(*key0)) { 3116 error = EINVAL; 3117 goto fail; 3118 } 3119 switch (mhp->msg->sadb_msg_satype) { 3120 case SADB_SATYPE_ESP: 3121 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3122 sav->alg_enc != SADB_EALG_NULL) { 3123 error = EINVAL; 3124 break; 3125 } 3126 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3127 len, 3128 M_IPSEC_MISC); 3129 if (sav->key_enc == NULL) { 3130 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3131 __func__)); 3132 error = ENOBUFS; 3133 goto fail; 3134 } 3135 break; 3136 case SADB_X_SATYPE_IPCOMP: 3137 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3138 error = EINVAL; 3139 sav->key_enc = NULL; /*just in case*/ 3140 break; 3141 case SADB_SATYPE_AH: 3142 case SADB_X_SATYPE_TCPSIGNATURE: 3143 default: 3144 error = EINVAL; 3145 break; 3146 } 3147 if (error) { 3148 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3149 __func__)); 3150 goto fail; 3151 } 3152 } 3153 3154 /* set iv */ 3155 sav->ivlen = 0; 3156 3157 switch (mhp->msg->sadb_msg_satype) { 3158 case SADB_SATYPE_AH: 3159 error = xform_init(sav, XF_AH); 3160 break; 3161 case SADB_SATYPE_ESP: 3162 error = xform_init(sav, XF_ESP); 3163 break; 3164 case SADB_X_SATYPE_IPCOMP: 3165 error = xform_init(sav, XF_IPCOMP); 3166 break; 3167 case SADB_X_SATYPE_TCPSIGNATURE: 3168 error = xform_init(sav, XF_TCPSIGNATURE); 3169 break; 3170 } 3171 if (error) { 3172 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3173 __func__, mhp->msg->sadb_msg_satype)); 3174 goto fail; 3175 } 3176 3177 /* reset created */ 3178 sav->created = time_second; 3179 3180 /* make lifetime for CURRENT */ 3181 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3182 if (sav->lft_c == NULL) { 3183 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3184 error = ENOBUFS; 3185 goto fail; 3186 } 3187 3188 sav->lft_c->allocations = 0; 3189 sav->lft_c->bytes = 0; 3190 sav->lft_c->addtime = time_second; 3191 sav->lft_c->usetime = 0; 3192 3193 /* lifetimes for HARD and SOFT */ 3194 { 3195 const struct sadb_lifetime *lft0; 3196 3197 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3198 if (lft0 != NULL) { 3199 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3200 error = EINVAL; 3201 goto fail; 3202 } 3203 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3204 if (sav->lft_h == NULL) { 3205 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3206 error = ENOBUFS; 3207 goto fail; 3208 } 3209 /* to be initialize ? */ 3210 } 3211 3212 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3213 if (lft0 != NULL) { 3214 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3215 error = EINVAL; 3216 goto fail; 3217 } 3218 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3219 if (sav->lft_s == NULL) { 3220 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3221 error = ENOBUFS; 3222 goto fail; 3223 } 3224 /* to be initialize ? */ 3225 } 3226 } 3227 3228 return 0; 3229 3230 fail: 3231 /* initialization */ 3232 key_cleansav(sav); 3233 3234 return error; 3235} 3236 3237/* 3238 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3239 * OUT: 0: valid 3240 * other: errno 3241 */ 3242static int 3243key_mature(struct secasvar *sav) 3244{ 3245 INIT_VNET_IPSEC(curvnet); 3246 int error; 3247 3248 /* check SPI value */ 3249 switch (sav->sah->saidx.proto) { 3250 case IPPROTO_ESP: 3251 case IPPROTO_AH: 3252 /* 3253 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3254 * 1-255 reserved by IANA for future use, 3255 * 0 for implementation specific, local use. 3256 */ 3257 if (ntohl(sav->spi) <= 255) { 3258 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3259 __func__, (u_int32_t)ntohl(sav->spi))); 3260 return EINVAL; 3261 } 3262 break; 3263 } 3264 3265 /* check satype */ 3266 switch (sav->sah->saidx.proto) { 3267 case IPPROTO_ESP: 3268 /* check flags */ 3269 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3270 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3271 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3272 "given to old-esp.\n", __func__)); 3273 return EINVAL; 3274 } 3275 error = xform_init(sav, XF_ESP); 3276 break; 3277 case IPPROTO_AH: 3278 /* check flags */ 3279 if (sav->flags & SADB_X_EXT_DERIV) { 3280 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3281 "given to AH SA.\n", __func__)); 3282 return EINVAL; 3283 } 3284 if (sav->alg_enc != SADB_EALG_NONE) { 3285 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3286 "mismated.\n", __func__)); 3287 return(EINVAL); 3288 } 3289 error = xform_init(sav, XF_AH); 3290 break; 3291 case IPPROTO_IPCOMP: 3292 if (sav->alg_auth != SADB_AALG_NONE) { 3293 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3294 "mismated.\n", __func__)); 3295 return(EINVAL); 3296 } 3297 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3298 && ntohl(sav->spi) >= 0x10000) { 3299 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3300 __func__)); 3301 return(EINVAL); 3302 } 3303 error = xform_init(sav, XF_IPCOMP); 3304 break; 3305 case IPPROTO_TCP: 3306 if (sav->alg_enc != SADB_EALG_NONE) { 3307 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3308 "mismated.\n", __func__)); 3309 return(EINVAL); 3310 } 3311 error = xform_init(sav, XF_TCPSIGNATURE); 3312 break; 3313 default: 3314 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3315 error = EPROTONOSUPPORT; 3316 break; 3317 } 3318 if (error == 0) { 3319 SAHTREE_LOCK(); 3320 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3321 SAHTREE_UNLOCK(); 3322 } 3323 return (error); 3324} 3325 3326/* 3327 * subroutine for SADB_GET and SADB_DUMP. 3328 */ 3329static struct mbuf * 3330key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3331 u_int32_t seq, u_int32_t pid) 3332{ 3333 struct mbuf *result = NULL, *tres = NULL, *m; 3334 int i; 3335 int dumporder[] = { 3336 SADB_EXT_SA, SADB_X_EXT_SA2, 3337 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3338 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3339 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3340 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3341 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3342 }; 3343 3344 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3345 if (m == NULL) 3346 goto fail; 3347 result = m; 3348 3349 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3350 m = NULL; 3351 switch (dumporder[i]) { 3352 case SADB_EXT_SA: 3353 m = key_setsadbsa(sav); 3354 if (!m) 3355 goto fail; 3356 break; 3357 3358 case SADB_X_EXT_SA2: 3359 m = key_setsadbxsa2(sav->sah->saidx.mode, 3360 sav->replay ? sav->replay->count : 0, 3361 sav->sah->saidx.reqid); 3362 if (!m) 3363 goto fail; 3364 break; 3365 3366 case SADB_EXT_ADDRESS_SRC: 3367 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3368 &sav->sah->saidx.src.sa, 3369 FULLMASK, IPSEC_ULPROTO_ANY); 3370 if (!m) 3371 goto fail; 3372 break; 3373 3374 case SADB_EXT_ADDRESS_DST: 3375 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3376 &sav->sah->saidx.dst.sa, 3377 FULLMASK, IPSEC_ULPROTO_ANY); 3378 if (!m) 3379 goto fail; 3380 break; 3381 3382 case SADB_EXT_KEY_AUTH: 3383 if (!sav->key_auth) 3384 continue; 3385 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3386 if (!m) 3387 goto fail; 3388 break; 3389 3390 case SADB_EXT_KEY_ENCRYPT: 3391 if (!sav->key_enc) 3392 continue; 3393 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3394 if (!m) 3395 goto fail; 3396 break; 3397 3398 case SADB_EXT_LIFETIME_CURRENT: 3399 if (!sav->lft_c) 3400 continue; 3401 m = key_setlifetime(sav->lft_c, 3402 SADB_EXT_LIFETIME_CURRENT); 3403 if (!m) 3404 goto fail; 3405 break; 3406 3407 case SADB_EXT_LIFETIME_HARD: 3408 if (!sav->lft_h) 3409 continue; 3410 m = key_setlifetime(sav->lft_h, 3411 SADB_EXT_LIFETIME_HARD); 3412 if (!m) 3413 goto fail; 3414 break; 3415 3416 case SADB_EXT_LIFETIME_SOFT: 3417 if (!sav->lft_s) 3418 continue; 3419 m = key_setlifetime(sav->lft_s, 3420 SADB_EXT_LIFETIME_SOFT); 3421 3422 if (!m) 3423 goto fail; 3424 break; 3425 3426 case SADB_EXT_ADDRESS_PROXY: 3427 case SADB_EXT_IDENTITY_SRC: 3428 case SADB_EXT_IDENTITY_DST: 3429 /* XXX: should we brought from SPD ? */ 3430 case SADB_EXT_SENSITIVITY: 3431 default: 3432 continue; 3433 } 3434 3435 if (!m) 3436 goto fail; 3437 if (tres) 3438 m_cat(m, tres); 3439 tres = m; 3440 3441 } 3442 3443 m_cat(result, tres); 3444 if (result->m_len < sizeof(struct sadb_msg)) { 3445 result = m_pullup(result, sizeof(struct sadb_msg)); 3446 if (result == NULL) 3447 goto fail; 3448 } 3449 3450 result->m_pkthdr.len = 0; 3451 for (m = result; m; m = m->m_next) 3452 result->m_pkthdr.len += m->m_len; 3453 3454 mtod(result, struct sadb_msg *)->sadb_msg_len = 3455 PFKEY_UNIT64(result->m_pkthdr.len); 3456 3457 return result; 3458 3459fail: 3460 m_freem(result); 3461 m_freem(tres); 3462 return NULL; 3463} 3464 3465/* 3466 * set data into sadb_msg. 3467 */ 3468static struct mbuf * 3469key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3470 pid_t pid, u_int16_t reserved) 3471{ 3472 struct mbuf *m; 3473 struct sadb_msg *p; 3474 int len; 3475 3476 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3477 if (len > MCLBYTES) 3478 return NULL; 3479 MGETHDR(m, M_DONTWAIT, MT_DATA); 3480 if (m && len > MHLEN) { 3481 MCLGET(m, M_DONTWAIT); 3482 if ((m->m_flags & M_EXT) == 0) { 3483 m_freem(m); 3484 m = NULL; 3485 } 3486 } 3487 if (!m) 3488 return NULL; 3489 m->m_pkthdr.len = m->m_len = len; 3490 m->m_next = NULL; 3491 3492 p = mtod(m, struct sadb_msg *); 3493 3494 bzero(p, len); 3495 p->sadb_msg_version = PF_KEY_V2; 3496 p->sadb_msg_type = type; 3497 p->sadb_msg_errno = 0; 3498 p->sadb_msg_satype = satype; 3499 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3500 p->sadb_msg_reserved = reserved; 3501 p->sadb_msg_seq = seq; 3502 p->sadb_msg_pid = (u_int32_t)pid; 3503 3504 return m; 3505} 3506 3507/* 3508 * copy secasvar data into sadb_address. 3509 */ 3510static struct mbuf * 3511key_setsadbsa(sav) 3512 struct secasvar *sav; 3513{ 3514 struct mbuf *m; 3515 struct sadb_sa *p; 3516 int len; 3517 3518 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3519 m = key_alloc_mbuf(len); 3520 if (!m || m->m_next) { /*XXX*/ 3521 if (m) 3522 m_freem(m); 3523 return NULL; 3524 } 3525 3526 p = mtod(m, struct sadb_sa *); 3527 3528 bzero(p, len); 3529 p->sadb_sa_len = PFKEY_UNIT64(len); 3530 p->sadb_sa_exttype = SADB_EXT_SA; 3531 p->sadb_sa_spi = sav->spi; 3532 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3533 p->sadb_sa_state = sav->state; 3534 p->sadb_sa_auth = sav->alg_auth; 3535 p->sadb_sa_encrypt = sav->alg_enc; 3536 p->sadb_sa_flags = sav->flags; 3537 3538 return m; 3539} 3540 3541/* 3542 * set data into sadb_address. 3543 */ 3544static struct mbuf * 3545key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3546{ 3547 struct mbuf *m; 3548 struct sadb_address *p; 3549 size_t len; 3550 3551 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3552 PFKEY_ALIGN8(saddr->sa_len); 3553 m = key_alloc_mbuf(len); 3554 if (!m || m->m_next) { /*XXX*/ 3555 if (m) 3556 m_freem(m); 3557 return NULL; 3558 } 3559 3560 p = mtod(m, struct sadb_address *); 3561 3562 bzero(p, len); 3563 p->sadb_address_len = PFKEY_UNIT64(len); 3564 p->sadb_address_exttype = exttype; 3565 p->sadb_address_proto = ul_proto; 3566 if (prefixlen == FULLMASK) { 3567 switch (saddr->sa_family) { 3568 case AF_INET: 3569 prefixlen = sizeof(struct in_addr) << 3; 3570 break; 3571 case AF_INET6: 3572 prefixlen = sizeof(struct in6_addr) << 3; 3573 break; 3574 default: 3575 ; /*XXX*/ 3576 } 3577 } 3578 p->sadb_address_prefixlen = prefixlen; 3579 p->sadb_address_reserved = 0; 3580 3581 bcopy(saddr, 3582 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3583 saddr->sa_len); 3584 3585 return m; 3586} 3587 3588/* 3589 * set data into sadb_x_sa2. 3590 */ 3591static struct mbuf * 3592key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3593{ 3594 struct mbuf *m; 3595 struct sadb_x_sa2 *p; 3596 size_t len; 3597 3598 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3599 m = key_alloc_mbuf(len); 3600 if (!m || m->m_next) { /*XXX*/ 3601 if (m) 3602 m_freem(m); 3603 return NULL; 3604 } 3605 3606 p = mtod(m, struct sadb_x_sa2 *); 3607 3608 bzero(p, len); 3609 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3610 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3611 p->sadb_x_sa2_mode = mode; 3612 p->sadb_x_sa2_reserved1 = 0; 3613 p->sadb_x_sa2_reserved2 = 0; 3614 p->sadb_x_sa2_sequence = seq; 3615 p->sadb_x_sa2_reqid = reqid; 3616 3617 return m; 3618} 3619 3620/* 3621 * set data into sadb_x_policy 3622 */ 3623static struct mbuf * 3624key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3625{ 3626 struct mbuf *m; 3627 struct sadb_x_policy *p; 3628 size_t len; 3629 3630 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3631 m = key_alloc_mbuf(len); 3632 if (!m || m->m_next) { /*XXX*/ 3633 if (m) 3634 m_freem(m); 3635 return NULL; 3636 } 3637 3638 p = mtod(m, struct sadb_x_policy *); 3639 3640 bzero(p, len); 3641 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3642 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3643 p->sadb_x_policy_type = type; 3644 p->sadb_x_policy_dir = dir; 3645 p->sadb_x_policy_id = id; 3646 3647 return m; 3648} 3649 3650/* %%% utilities */ 3651/* Take a key message (sadb_key) from the socket and turn it into one 3652 * of the kernel's key structures (seckey). 3653 * 3654 * IN: pointer to the src 3655 * OUT: NULL no more memory 3656 */ 3657struct seckey * 3658key_dup_keymsg(const struct sadb_key *src, u_int len, 3659 struct malloc_type *type) 3660{ 3661 INIT_VNET_IPSEC(curvnet); 3662 struct seckey *dst; 3663 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3664 if (dst != NULL) { 3665 dst->bits = src->sadb_key_bits; 3666 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3667 if (dst->key_data != NULL) { 3668 bcopy((const char *)src + sizeof(struct sadb_key), 3669 dst->key_data, len); 3670 } else { 3671 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3672 __func__)); 3673 free(dst, type); 3674 dst = NULL; 3675 } 3676 } else { 3677 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3678 __func__)); 3679 3680 } 3681 return dst; 3682} 3683 3684/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3685 * turn it into one of the kernel's lifetime structures (seclifetime). 3686 * 3687 * IN: pointer to the destination, source and malloc type 3688 * OUT: NULL, no more memory 3689 */ 3690 3691static struct seclifetime * 3692key_dup_lifemsg(const struct sadb_lifetime *src, 3693 struct malloc_type *type) 3694{ 3695 INIT_VNET_IPSEC(curvnet); 3696 struct seclifetime *dst = NULL; 3697 3698 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3699 type, M_NOWAIT); 3700 if (dst == NULL) { 3701 /* XXX counter */ 3702 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3703 } else { 3704 dst->allocations = src->sadb_lifetime_allocations; 3705 dst->bytes = src->sadb_lifetime_bytes; 3706 dst->addtime = src->sadb_lifetime_addtime; 3707 dst->usetime = src->sadb_lifetime_usetime; 3708 } 3709 return dst; 3710} 3711 3712/* compare my own address 3713 * OUT: 1: true, i.e. my address. 3714 * 0: false 3715 */ 3716int 3717key_ismyaddr(sa) 3718 struct sockaddr *sa; 3719{ 3720#ifdef INET 3721 INIT_VNET_INET(curvnet); 3722 struct sockaddr_in *sin; 3723 struct in_ifaddr *ia; 3724#endif 3725 3726 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3727 3728 switch (sa->sa_family) { 3729#ifdef INET 3730 case AF_INET: 3731 sin = (struct sockaddr_in *)sa; 3732 for (ia = V_in_ifaddrhead.tqh_first; ia; 3733 ia = ia->ia_link.tqe_next) 3734 { 3735 if (sin->sin_family == ia->ia_addr.sin_family && 3736 sin->sin_len == ia->ia_addr.sin_len && 3737 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3738 { 3739 return 1; 3740 } 3741 } 3742 break; 3743#endif 3744#ifdef INET6 3745 case AF_INET6: 3746 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3747#endif 3748 } 3749 3750 return 0; 3751} 3752 3753#ifdef INET6 3754/* 3755 * compare my own address for IPv6. 3756 * 1: ours 3757 * 0: other 3758 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3759 */ 3760#include <netinet6/in6_var.h> 3761 3762static int 3763key_ismyaddr6(sin6) 3764 struct sockaddr_in6 *sin6; 3765{ 3766 INIT_VNET_INET6(curvnet); 3767 struct in6_ifaddr *ia; 3768#if 0 3769 struct in6_multi *in6m; 3770#endif 3771 3772 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3773 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3774 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3775 return 1; 3776 3777#if 0 3778 /* 3779 * XXX Multicast 3780 * XXX why do we care about multlicast here while we don't care 3781 * about IPv4 multicast?? 3782 * XXX scope 3783 */ 3784 in6m = NULL; 3785 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3786 if (in6m) 3787 return 1; 3788#endif 3789 } 3790 3791 /* loopback, just for safety */ 3792 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3793 return 1; 3794 3795 return 0; 3796} 3797#endif /*INET6*/ 3798 3799/* 3800 * compare two secasindex structure. 3801 * flag can specify to compare 2 saidxes. 3802 * compare two secasindex structure without both mode and reqid. 3803 * don't compare port. 3804 * IN: 3805 * saidx0: source, it can be in SAD. 3806 * saidx1: object. 3807 * OUT: 3808 * 1 : equal 3809 * 0 : not equal 3810 */ 3811static int 3812key_cmpsaidx( 3813 const struct secasindex *saidx0, 3814 const struct secasindex *saidx1, 3815 int flag) 3816{ 3817 /* sanity */ 3818 if (saidx0 == NULL && saidx1 == NULL) 3819 return 1; 3820 3821 if (saidx0 == NULL || saidx1 == NULL) 3822 return 0; 3823 3824 if (saidx0->proto != saidx1->proto) 3825 return 0; 3826 3827 if (flag == CMP_EXACTLY) { 3828 if (saidx0->mode != saidx1->mode) 3829 return 0; 3830 if (saidx0->reqid != saidx1->reqid) 3831 return 0; 3832 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3833 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3834 return 0; 3835 } else { 3836 3837 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3838 if (flag == CMP_MODE_REQID 3839 ||flag == CMP_REQID) { 3840 /* 3841 * If reqid of SPD is non-zero, unique SA is required. 3842 * The result must be of same reqid in this case. 3843 */ 3844 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3845 return 0; 3846 } 3847 3848 if (flag == CMP_MODE_REQID) { 3849 if (saidx0->mode != IPSEC_MODE_ANY 3850 && saidx0->mode != saidx1->mode) 3851 return 0; 3852 } 3853 3854 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3855 return 0; 3856 } 3857 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3858 return 0; 3859 } 3860 } 3861 3862 return 1; 3863} 3864 3865/* 3866 * compare two secindex structure exactly. 3867 * IN: 3868 * spidx0: source, it is often in SPD. 3869 * spidx1: object, it is often from PFKEY message. 3870 * OUT: 3871 * 1 : equal 3872 * 0 : not equal 3873 */ 3874static int 3875key_cmpspidx_exactly( 3876 struct secpolicyindex *spidx0, 3877 struct secpolicyindex *spidx1) 3878{ 3879 /* sanity */ 3880 if (spidx0 == NULL && spidx1 == NULL) 3881 return 1; 3882 3883 if (spidx0 == NULL || spidx1 == NULL) 3884 return 0; 3885 3886 if (spidx0->prefs != spidx1->prefs 3887 || spidx0->prefd != spidx1->prefd 3888 || spidx0->ul_proto != spidx1->ul_proto) 3889 return 0; 3890 3891 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3892 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3893} 3894 3895/* 3896 * compare two secindex structure with mask. 3897 * IN: 3898 * spidx0: source, it is often in SPD. 3899 * spidx1: object, it is often from IP header. 3900 * OUT: 3901 * 1 : equal 3902 * 0 : not equal 3903 */ 3904static int 3905key_cmpspidx_withmask( 3906 struct secpolicyindex *spidx0, 3907 struct secpolicyindex *spidx1) 3908{ 3909 /* sanity */ 3910 if (spidx0 == NULL && spidx1 == NULL) 3911 return 1; 3912 3913 if (spidx0 == NULL || spidx1 == NULL) 3914 return 0; 3915 3916 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3917 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3918 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3919 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3920 return 0; 3921 3922 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3923 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3924 && spidx0->ul_proto != spidx1->ul_proto) 3925 return 0; 3926 3927 switch (spidx0->src.sa.sa_family) { 3928 case AF_INET: 3929 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3930 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3931 return 0; 3932 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3933 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3934 return 0; 3935 break; 3936 case AF_INET6: 3937 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3938 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3939 return 0; 3940 /* 3941 * scope_id check. if sin6_scope_id is 0, we regard it 3942 * as a wildcard scope, which matches any scope zone ID. 3943 */ 3944 if (spidx0->src.sin6.sin6_scope_id && 3945 spidx1->src.sin6.sin6_scope_id && 3946 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3947 return 0; 3948 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3949 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3950 return 0; 3951 break; 3952 default: 3953 /* XXX */ 3954 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3955 return 0; 3956 break; 3957 } 3958 3959 switch (spidx0->dst.sa.sa_family) { 3960 case AF_INET: 3961 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3962 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3963 return 0; 3964 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3965 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3966 return 0; 3967 break; 3968 case AF_INET6: 3969 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3970 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3971 return 0; 3972 /* 3973 * scope_id check. if sin6_scope_id is 0, we regard it 3974 * as a wildcard scope, which matches any scope zone ID. 3975 */ 3976 if (spidx0->dst.sin6.sin6_scope_id && 3977 spidx1->dst.sin6.sin6_scope_id && 3978 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3979 return 0; 3980 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3981 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3982 return 0; 3983 break; 3984 default: 3985 /* XXX */ 3986 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3987 return 0; 3988 break; 3989 } 3990 3991 /* XXX Do we check other field ? e.g. flowinfo */ 3992 3993 return 1; 3994} 3995 3996/* returns 0 on match */ 3997static int 3998key_sockaddrcmp( 3999 const struct sockaddr *sa1, 4000 const struct sockaddr *sa2, 4001 int port) 4002{ 4003#ifdef satosin 4004#undef satosin 4005#endif 4006#define satosin(s) ((const struct sockaddr_in *)s) 4007#ifdef satosin6 4008#undef satosin6 4009#endif 4010#define satosin6(s) ((const struct sockaddr_in6 *)s) 4011 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4012 return 1; 4013 4014 switch (sa1->sa_family) { 4015 case AF_INET: 4016 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4017 return 1; 4018 if (satosin(sa1)->sin_addr.s_addr != 4019 satosin(sa2)->sin_addr.s_addr) { 4020 return 1; 4021 } 4022 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4023 return 1; 4024 break; 4025 case AF_INET6: 4026 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4027 return 1; /*EINVAL*/ 4028 if (satosin6(sa1)->sin6_scope_id != 4029 satosin6(sa2)->sin6_scope_id) { 4030 return 1; 4031 } 4032 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4033 &satosin6(sa2)->sin6_addr)) { 4034 return 1; 4035 } 4036 if (port && 4037 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4038 return 1; 4039 } 4040 break; 4041 default: 4042 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4043 return 1; 4044 break; 4045 } 4046 4047 return 0; 4048#undef satosin 4049#undef satosin6 4050} 4051 4052/* 4053 * compare two buffers with mask. 4054 * IN: 4055 * addr1: source 4056 * addr2: object 4057 * bits: Number of bits to compare 4058 * OUT: 4059 * 1 : equal 4060 * 0 : not equal 4061 */ 4062static int 4063key_bbcmp(const void *a1, const void *a2, u_int bits) 4064{ 4065 const unsigned char *p1 = a1; 4066 const unsigned char *p2 = a2; 4067 4068 /* XXX: This could be considerably faster if we compare a word 4069 * at a time, but it is complicated on LSB Endian machines */ 4070 4071 /* Handle null pointers */ 4072 if (p1 == NULL || p2 == NULL) 4073 return (p1 == p2); 4074 4075 while (bits >= 8) { 4076 if (*p1++ != *p2++) 4077 return 0; 4078 bits -= 8; 4079 } 4080 4081 if (bits > 0) { 4082 u_int8_t mask = ~((1<<(8-bits))-1); 4083 if ((*p1 & mask) != (*p2 & mask)) 4084 return 0; 4085 } 4086 return 1; /* Match! */ 4087} 4088 4089static void 4090key_flush_spd(time_t now) 4091{ 4092 INIT_VNET_IPSEC(curvnet); 4093 static u_int16_t sptree_scangen = 0; 4094 u_int16_t gen = sptree_scangen++; 4095 struct secpolicy *sp; 4096 u_int dir; 4097 4098 /* SPD */ 4099 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4100restart: 4101 SPTREE_LOCK(); 4102 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4103 if (sp->scangen == gen) /* previously handled */ 4104 continue; 4105 sp->scangen = gen; 4106 if (sp->state == IPSEC_SPSTATE_DEAD && 4107 sp->refcnt == 1) { 4108 /* 4109 * Ensure that we only decrease refcnt once, 4110 * when we're the last consumer. 4111 * Directly call SP_DELREF/key_delsp instead 4112 * of KEY_FREESP to avoid unlocking/relocking 4113 * SPTREE_LOCK before key_delsp: may refcnt 4114 * be increased again during that time ? 4115 * NB: also clean entries created by 4116 * key_spdflush 4117 */ 4118 SP_DELREF(sp); 4119 key_delsp(sp); 4120 SPTREE_UNLOCK(); 4121 goto restart; 4122 } 4123 if (sp->lifetime == 0 && sp->validtime == 0) 4124 continue; 4125 if ((sp->lifetime && now - sp->created > sp->lifetime) 4126 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4127 sp->state = IPSEC_SPSTATE_DEAD; 4128 SPTREE_UNLOCK(); 4129 key_spdexpire(sp); 4130 goto restart; 4131 } 4132 } 4133 SPTREE_UNLOCK(); 4134 } 4135} 4136 4137static void 4138key_flush_sad(time_t now) 4139{ 4140 INIT_VNET_IPSEC(curvnet); 4141 struct secashead *sah, *nextsah; 4142 struct secasvar *sav, *nextsav; 4143 4144 /* SAD */ 4145 SAHTREE_LOCK(); 4146 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4147 /* if sah has been dead, then delete it and process next sah. */ 4148 if (sah->state == SADB_SASTATE_DEAD) { 4149 key_delsah(sah); 4150 continue; 4151 } 4152 4153 /* if LARVAL entry doesn't become MATURE, delete it. */ 4154 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4155 /* Need to also check refcnt for a larval SA ??? */ 4156 if (now - sav->created > V_key_larval_lifetime) 4157 KEY_FREESAV(&sav); 4158 } 4159 4160 /* 4161 * check MATURE entry to start to send expire message 4162 * whether or not. 4163 */ 4164 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4165 /* we don't need to check. */ 4166 if (sav->lft_s == NULL) 4167 continue; 4168 4169 /* sanity check */ 4170 if (sav->lft_c == NULL) { 4171 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4172 "time, why?\n", __func__)); 4173 continue; 4174 } 4175 4176 /* check SOFT lifetime */ 4177 if (sav->lft_s->addtime != 0 && 4178 now - sav->created > sav->lft_s->addtime) { 4179 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4180 /* 4181 * Actually, only send expire message if 4182 * SA has been used, as it was done before, 4183 * but should we always send such message, 4184 * and let IKE daemon decide if it should be 4185 * renegotiated or not ? 4186 * XXX expire message will actually NOT be 4187 * sent if SA is only used after soft 4188 * lifetime has been reached, see below 4189 * (DYING state) 4190 */ 4191 if (sav->lft_c->usetime != 0) 4192 key_expire(sav); 4193 } 4194 /* check SOFT lifetime by bytes */ 4195 /* 4196 * XXX I don't know the way to delete this SA 4197 * when new SA is installed. Caution when it's 4198 * installed too big lifetime by time. 4199 */ 4200 else if (sav->lft_s->bytes != 0 && 4201 sav->lft_s->bytes < sav->lft_c->bytes) { 4202 4203 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4204 /* 4205 * XXX If we keep to send expire 4206 * message in the status of 4207 * DYING. Do remove below code. 4208 */ 4209 key_expire(sav); 4210 } 4211 } 4212 4213 /* check DYING entry to change status to DEAD. */ 4214 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4215 /* we don't need to check. */ 4216 if (sav->lft_h == NULL) 4217 continue; 4218 4219 /* sanity check */ 4220 if (sav->lft_c == NULL) { 4221 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4222 "time, why?\n", __func__)); 4223 continue; 4224 } 4225 4226 if (sav->lft_h->addtime != 0 && 4227 now - sav->created > sav->lft_h->addtime) { 4228 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4229 KEY_FREESAV(&sav); 4230 } 4231#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4232 else if (sav->lft_s != NULL 4233 && sav->lft_s->addtime != 0 4234 && now - sav->created > sav->lft_s->addtime) { 4235 /* 4236 * XXX: should be checked to be 4237 * installed the valid SA. 4238 */ 4239 4240 /* 4241 * If there is no SA then sending 4242 * expire message. 4243 */ 4244 key_expire(sav); 4245 } 4246#endif 4247 /* check HARD lifetime by bytes */ 4248 else if (sav->lft_h->bytes != 0 && 4249 sav->lft_h->bytes < sav->lft_c->bytes) { 4250 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4251 KEY_FREESAV(&sav); 4252 } 4253 } 4254 4255 /* delete entry in DEAD */ 4256 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4257 /* sanity check */ 4258 if (sav->state != SADB_SASTATE_DEAD) { 4259 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4260 "(queue: %d SA: %d): kill it anyway\n", 4261 __func__, 4262 SADB_SASTATE_DEAD, sav->state)); 4263 } 4264 /* 4265 * do not call key_freesav() here. 4266 * sav should already be freed, and sav->refcnt 4267 * shows other references to sav 4268 * (such as from SPD). 4269 */ 4270 } 4271 } 4272 SAHTREE_UNLOCK(); 4273} 4274 4275static void 4276key_flush_acq(time_t now) 4277{ 4278 INIT_VNET_IPSEC(curvnet); 4279 struct secacq *acq, *nextacq; 4280 4281 /* ACQ tree */ 4282 ACQ_LOCK(); 4283 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4284 nextacq = LIST_NEXT(acq, chain); 4285 if (now - acq->created > V_key_blockacq_lifetime 4286 && __LIST_CHAINED(acq)) { 4287 LIST_REMOVE(acq, chain); 4288 free(acq, M_IPSEC_SAQ); 4289 } 4290 } 4291 ACQ_UNLOCK(); 4292} 4293 4294static void 4295key_flush_spacq(time_t now) 4296{ 4297 INIT_VNET_IPSEC(curvnet); 4298 struct secspacq *acq, *nextacq; 4299 4300 /* SP ACQ tree */ 4301 SPACQ_LOCK(); 4302 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4303 nextacq = LIST_NEXT(acq, chain); 4304 if (now - acq->created > V_key_blockacq_lifetime 4305 && __LIST_CHAINED(acq)) { 4306 LIST_REMOVE(acq, chain); 4307 free(acq, M_IPSEC_SAQ); 4308 } 4309 } 4310 SPACQ_UNLOCK(); 4311} 4312 4313/* 4314 * time handler. 4315 * scanning SPD and SAD to check status for each entries, 4316 * and do to remove or to expire. 4317 * XXX: year 2038 problem may remain. 4318 */ 4319void 4320key_timehandler(void) 4321{ 4322 VNET_ITERATOR_DECL(vnet_iter); 4323 time_t now = time_second; 4324 4325 VNET_LIST_RLOCK(); 4326 VNET_FOREACH(vnet_iter) { 4327 CURVNET_SET(vnet_iter); 4328 key_flush_spd(now); 4329 key_flush_sad(now); 4330 key_flush_acq(now); 4331 key_flush_spacq(now); 4332 CURVNET_RESTORE(); 4333 } 4334 VNET_LIST_RUNLOCK(); 4335 4336#ifndef IPSEC_DEBUG2 4337 /* do exchange to tick time !! */ 4338 (void)timeout((void *)key_timehandler, (void *)0, hz); 4339#endif /* IPSEC_DEBUG2 */ 4340} 4341 4342u_long 4343key_random() 4344{ 4345 u_long value; 4346 4347 key_randomfill(&value, sizeof(value)); 4348 return value; 4349} 4350 4351void 4352key_randomfill(p, l) 4353 void *p; 4354 size_t l; 4355{ 4356 size_t n; 4357 u_long v; 4358 static int warn = 1; 4359 4360 n = 0; 4361 n = (size_t)read_random(p, (u_int)l); 4362 /* last resort */ 4363 while (n < l) { 4364 v = random(); 4365 bcopy(&v, (u_int8_t *)p + n, 4366 l - n < sizeof(v) ? l - n : sizeof(v)); 4367 n += sizeof(v); 4368 4369 if (warn) { 4370 printf("WARNING: pseudo-random number generator " 4371 "used for IPsec processing\n"); 4372 warn = 0; 4373 } 4374 } 4375} 4376 4377/* 4378 * map SADB_SATYPE_* to IPPROTO_*. 4379 * if satype == SADB_SATYPE then satype is mapped to ~0. 4380 * OUT: 4381 * 0: invalid satype. 4382 */ 4383static u_int16_t 4384key_satype2proto(u_int8_t satype) 4385{ 4386 switch (satype) { 4387 case SADB_SATYPE_UNSPEC: 4388 return IPSEC_PROTO_ANY; 4389 case SADB_SATYPE_AH: 4390 return IPPROTO_AH; 4391 case SADB_SATYPE_ESP: 4392 return IPPROTO_ESP; 4393 case SADB_X_SATYPE_IPCOMP: 4394 return IPPROTO_IPCOMP; 4395 case SADB_X_SATYPE_TCPSIGNATURE: 4396 return IPPROTO_TCP; 4397 default: 4398 return 0; 4399 } 4400 /* NOTREACHED */ 4401} 4402 4403/* 4404 * map IPPROTO_* to SADB_SATYPE_* 4405 * OUT: 4406 * 0: invalid protocol type. 4407 */ 4408static u_int8_t 4409key_proto2satype(u_int16_t proto) 4410{ 4411 switch (proto) { 4412 case IPPROTO_AH: 4413 return SADB_SATYPE_AH; 4414 case IPPROTO_ESP: 4415 return SADB_SATYPE_ESP; 4416 case IPPROTO_IPCOMP: 4417 return SADB_X_SATYPE_IPCOMP; 4418 case IPPROTO_TCP: 4419 return SADB_X_SATYPE_TCPSIGNATURE; 4420 default: 4421 return 0; 4422 } 4423 /* NOTREACHED */ 4424} 4425 4426/* %%% PF_KEY */ 4427/* 4428 * SADB_GETSPI processing is to receive 4429 * <base, (SA2), src address, dst address, (SPI range)> 4430 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4431 * tree with the status of LARVAL, and send 4432 * <base, SA(*), address(SD)> 4433 * to the IKMPd. 4434 * 4435 * IN: mhp: pointer to the pointer to each header. 4436 * OUT: NULL if fail. 4437 * other if success, return pointer to the message to send. 4438 */ 4439static int 4440key_getspi(so, m, mhp) 4441 struct socket *so; 4442 struct mbuf *m; 4443 const struct sadb_msghdr *mhp; 4444{ 4445 INIT_VNET_IPSEC(curvnet); 4446 struct sadb_address *src0, *dst0; 4447 struct secasindex saidx; 4448 struct secashead *newsah; 4449 struct secasvar *newsav; 4450 u_int8_t proto; 4451 u_int32_t spi; 4452 u_int8_t mode; 4453 u_int32_t reqid; 4454 int error; 4455 4456 IPSEC_ASSERT(so != NULL, ("null socket")); 4457 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4458 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4459 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4460 4461 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4462 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4463 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4464 __func__)); 4465 return key_senderror(so, m, EINVAL); 4466 } 4467 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4468 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4469 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4470 __func__)); 4471 return key_senderror(so, m, EINVAL); 4472 } 4473 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4474 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4475 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4476 } else { 4477 mode = IPSEC_MODE_ANY; 4478 reqid = 0; 4479 } 4480 4481 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4482 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4483 4484 /* map satype to proto */ 4485 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4486 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4487 __func__)); 4488 return key_senderror(so, m, EINVAL); 4489 } 4490 4491 /* make sure if port number is zero. */ 4492 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4493 case AF_INET: 4494 if (((struct sockaddr *)(src0 + 1))->sa_len != 4495 sizeof(struct sockaddr_in)) 4496 return key_senderror(so, m, EINVAL); 4497 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4498 break; 4499 case AF_INET6: 4500 if (((struct sockaddr *)(src0 + 1))->sa_len != 4501 sizeof(struct sockaddr_in6)) 4502 return key_senderror(so, m, EINVAL); 4503 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4504 break; 4505 default: 4506 ; /*???*/ 4507 } 4508 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4509 case AF_INET: 4510 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4511 sizeof(struct sockaddr_in)) 4512 return key_senderror(so, m, EINVAL); 4513 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4514 break; 4515 case AF_INET6: 4516 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4517 sizeof(struct sockaddr_in6)) 4518 return key_senderror(so, m, EINVAL); 4519 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4520 break; 4521 default: 4522 ; /*???*/ 4523 } 4524 4525 /* XXX boundary check against sa_len */ 4526 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4527 4528 /* SPI allocation */ 4529 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4530 &saidx); 4531 if (spi == 0) 4532 return key_senderror(so, m, EINVAL); 4533 4534 /* get a SA index */ 4535 if ((newsah = key_getsah(&saidx)) == NULL) { 4536 /* create a new SA index */ 4537 if ((newsah = key_newsah(&saidx)) == NULL) { 4538 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4539 return key_senderror(so, m, ENOBUFS); 4540 } 4541 } 4542 4543 /* get a new SA */ 4544 /* XXX rewrite */ 4545 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4546 if (newsav == NULL) { 4547 /* XXX don't free new SA index allocated in above. */ 4548 return key_senderror(so, m, error); 4549 } 4550 4551 /* set spi */ 4552 newsav->spi = htonl(spi); 4553 4554 /* delete the entry in acqtree */ 4555 if (mhp->msg->sadb_msg_seq != 0) { 4556 struct secacq *acq; 4557 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4558 /* reset counter in order to deletion by timehandler. */ 4559 acq->created = time_second; 4560 acq->count = 0; 4561 } 4562 } 4563 4564 { 4565 struct mbuf *n, *nn; 4566 struct sadb_sa *m_sa; 4567 struct sadb_msg *newmsg; 4568 int off, len; 4569 4570 /* create new sadb_msg to reply. */ 4571 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4572 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4573 4574 MGETHDR(n, M_DONTWAIT, MT_DATA); 4575 if (len > MHLEN) { 4576 MCLGET(n, M_DONTWAIT); 4577 if ((n->m_flags & M_EXT) == 0) { 4578 m_freem(n); 4579 n = NULL; 4580 } 4581 } 4582 if (!n) 4583 return key_senderror(so, m, ENOBUFS); 4584 4585 n->m_len = len; 4586 n->m_next = NULL; 4587 off = 0; 4588 4589 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4590 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4591 4592 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4593 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4594 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4595 m_sa->sadb_sa_spi = htonl(spi); 4596 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4597 4598 IPSEC_ASSERT(off == len, 4599 ("length inconsistency (off %u len %u)", off, len)); 4600 4601 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4602 SADB_EXT_ADDRESS_DST); 4603 if (!n->m_next) { 4604 m_freem(n); 4605 return key_senderror(so, m, ENOBUFS); 4606 } 4607 4608 if (n->m_len < sizeof(struct sadb_msg)) { 4609 n = m_pullup(n, sizeof(struct sadb_msg)); 4610 if (n == NULL) 4611 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4612 } 4613 4614 n->m_pkthdr.len = 0; 4615 for (nn = n; nn; nn = nn->m_next) 4616 n->m_pkthdr.len += nn->m_len; 4617 4618 newmsg = mtod(n, struct sadb_msg *); 4619 newmsg->sadb_msg_seq = newsav->seq; 4620 newmsg->sadb_msg_errno = 0; 4621 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4622 4623 m_freem(m); 4624 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4625 } 4626} 4627 4628/* 4629 * allocating new SPI 4630 * called by key_getspi(). 4631 * OUT: 4632 * 0: failure. 4633 * others: success. 4634 */ 4635static u_int32_t 4636key_do_getnewspi(spirange, saidx) 4637 struct sadb_spirange *spirange; 4638 struct secasindex *saidx; 4639{ 4640 INIT_VNET_IPSEC(curvnet); 4641 u_int32_t newspi; 4642 u_int32_t min, max; 4643 int count = V_key_spi_trycnt; 4644 4645 /* set spi range to allocate */ 4646 if (spirange != NULL) { 4647 min = spirange->sadb_spirange_min; 4648 max = spirange->sadb_spirange_max; 4649 } else { 4650 min = V_key_spi_minval; 4651 max = V_key_spi_maxval; 4652 } 4653 /* IPCOMP needs 2-byte SPI */ 4654 if (saidx->proto == IPPROTO_IPCOMP) { 4655 u_int32_t t; 4656 if (min >= 0x10000) 4657 min = 0xffff; 4658 if (max >= 0x10000) 4659 max = 0xffff; 4660 if (min > max) { 4661 t = min; min = max; max = t; 4662 } 4663 } 4664 4665 if (min == max) { 4666 if (key_checkspidup(saidx, min) != NULL) { 4667 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4668 __func__, min)); 4669 return 0; 4670 } 4671 4672 count--; /* taking one cost. */ 4673 newspi = min; 4674 4675 } else { 4676 4677 /* init SPI */ 4678 newspi = 0; 4679 4680 /* when requesting to allocate spi ranged */ 4681 while (count--) { 4682 /* generate pseudo-random SPI value ranged. */ 4683 newspi = min + (key_random() % (max - min + 1)); 4684 4685 if (key_checkspidup(saidx, newspi) == NULL) 4686 break; 4687 } 4688 4689 if (count == 0 || newspi == 0) { 4690 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4691 __func__)); 4692 return 0; 4693 } 4694 } 4695 4696 /* statistics */ 4697 keystat.getspi_count = 4698 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4699 4700 return newspi; 4701} 4702 4703/* 4704 * SADB_UPDATE processing 4705 * receive 4706 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4707 * key(AE), (identity(SD),) (sensitivity)> 4708 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4709 * and send 4710 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4711 * (identity(SD),) (sensitivity)> 4712 * to the ikmpd. 4713 * 4714 * m will always be freed. 4715 */ 4716static int 4717key_update(so, m, mhp) 4718 struct socket *so; 4719 struct mbuf *m; 4720 const struct sadb_msghdr *mhp; 4721{ 4722 INIT_VNET_IPSEC(curvnet); 4723 struct sadb_sa *sa0; 4724 struct sadb_address *src0, *dst0; 4725 struct secasindex saidx; 4726 struct secashead *sah; 4727 struct secasvar *sav; 4728 u_int16_t proto; 4729 u_int8_t mode; 4730 u_int32_t reqid; 4731 int error; 4732 4733 IPSEC_ASSERT(so != NULL, ("null socket")); 4734 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4735 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4736 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4737 4738 /* map satype to proto */ 4739 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4740 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4741 __func__)); 4742 return key_senderror(so, m, EINVAL); 4743 } 4744 4745 if (mhp->ext[SADB_EXT_SA] == NULL || 4746 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4747 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4748 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4749 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4750 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4751 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4752 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4753 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4754 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4755 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4756 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4757 __func__)); 4758 return key_senderror(so, m, EINVAL); 4759 } 4760 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4761 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4762 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4763 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4764 __func__)); 4765 return key_senderror(so, m, EINVAL); 4766 } 4767 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4768 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4769 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4770 } else { 4771 mode = IPSEC_MODE_ANY; 4772 reqid = 0; 4773 } 4774 /* XXX boundary checking for other extensions */ 4775 4776 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4777 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4778 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4779 4780 /* XXX boundary check against sa_len */ 4781 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4782 4783 /* get a SA header */ 4784 if ((sah = key_getsah(&saidx)) == NULL) { 4785 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4786 return key_senderror(so, m, ENOENT); 4787 } 4788 4789 /* set spidx if there */ 4790 /* XXX rewrite */ 4791 error = key_setident(sah, m, mhp); 4792 if (error) 4793 return key_senderror(so, m, error); 4794 4795 /* find a SA with sequence number. */ 4796#ifdef IPSEC_DOSEQCHECK 4797 if (mhp->msg->sadb_msg_seq != 0 4798 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4799 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4800 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4801 return key_senderror(so, m, ENOENT); 4802 } 4803#else 4804 SAHTREE_LOCK(); 4805 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4806 SAHTREE_UNLOCK(); 4807 if (sav == NULL) { 4808 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4809 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4810 return key_senderror(so, m, EINVAL); 4811 } 4812#endif 4813 4814 /* validity check */ 4815 if (sav->sah->saidx.proto != proto) { 4816 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4817 "(DB=%u param=%u)\n", __func__, 4818 sav->sah->saidx.proto, proto)); 4819 return key_senderror(so, m, EINVAL); 4820 } 4821#ifdef IPSEC_DOSEQCHECK 4822 if (sav->spi != sa0->sadb_sa_spi) { 4823 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4824 __func__, 4825 (u_int32_t)ntohl(sav->spi), 4826 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4827 return key_senderror(so, m, EINVAL); 4828 } 4829#endif 4830 if (sav->pid != mhp->msg->sadb_msg_pid) { 4831 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4832 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4833 return key_senderror(so, m, EINVAL); 4834 } 4835 4836 /* copy sav values */ 4837 error = key_setsaval(sav, m, mhp); 4838 if (error) { 4839 KEY_FREESAV(&sav); 4840 return key_senderror(so, m, error); 4841 } 4842 4843 /* check SA values to be mature. */ 4844 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4845 KEY_FREESAV(&sav); 4846 return key_senderror(so, m, 0); 4847 } 4848 4849 { 4850 struct mbuf *n; 4851 4852 /* set msg buf from mhp */ 4853 n = key_getmsgbuf_x1(m, mhp); 4854 if (n == NULL) { 4855 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4856 return key_senderror(so, m, ENOBUFS); 4857 } 4858 4859 m_freem(m); 4860 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4861 } 4862} 4863 4864/* 4865 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4866 * only called by key_update(). 4867 * OUT: 4868 * NULL : not found 4869 * others : found, pointer to a SA. 4870 */ 4871#ifdef IPSEC_DOSEQCHECK 4872static struct secasvar * 4873key_getsavbyseq(sah, seq) 4874 struct secashead *sah; 4875 u_int32_t seq; 4876{ 4877 struct secasvar *sav; 4878 u_int state; 4879 4880 state = SADB_SASTATE_LARVAL; 4881 4882 /* search SAD with sequence number ? */ 4883 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4884 4885 KEY_CHKSASTATE(state, sav->state, __func__); 4886 4887 if (sav->seq == seq) { 4888 sa_addref(sav); 4889 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4890 printf("DP %s cause refcnt++:%d SA:%p\n", 4891 __func__, sav->refcnt, sav)); 4892 return sav; 4893 } 4894 } 4895 4896 return NULL; 4897} 4898#endif 4899 4900/* 4901 * SADB_ADD processing 4902 * add an entry to SA database, when received 4903 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4904 * key(AE), (identity(SD),) (sensitivity)> 4905 * from the ikmpd, 4906 * and send 4907 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4908 * (identity(SD),) (sensitivity)> 4909 * to the ikmpd. 4910 * 4911 * IGNORE identity and sensitivity messages. 4912 * 4913 * m will always be freed. 4914 */ 4915static int 4916key_add(so, m, mhp) 4917 struct socket *so; 4918 struct mbuf *m; 4919 const struct sadb_msghdr *mhp; 4920{ 4921 INIT_VNET_IPSEC(curvnet); 4922 struct sadb_sa *sa0; 4923 struct sadb_address *src0, *dst0; 4924 struct secasindex saidx; 4925 struct secashead *newsah; 4926 struct secasvar *newsav; 4927 u_int16_t proto; 4928 u_int8_t mode; 4929 u_int32_t reqid; 4930 int error; 4931 4932 IPSEC_ASSERT(so != NULL, ("null socket")); 4933 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4934 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4935 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4936 4937 /* map satype to proto */ 4938 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4939 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4940 __func__)); 4941 return key_senderror(so, m, EINVAL); 4942 } 4943 4944 if (mhp->ext[SADB_EXT_SA] == NULL || 4945 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4946 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4947 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4948 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4949 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4950 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4951 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4952 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4953 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4954 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4955 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4956 __func__)); 4957 return key_senderror(so, m, EINVAL); 4958 } 4959 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4960 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4961 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4962 /* XXX need more */ 4963 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4964 __func__)); 4965 return key_senderror(so, m, EINVAL); 4966 } 4967 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4968 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4969 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4970 } else { 4971 mode = IPSEC_MODE_ANY; 4972 reqid = 0; 4973 } 4974 4975 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4976 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4977 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4978 4979 /* XXX boundary check against sa_len */ 4980 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4981 4982 /* get a SA header */ 4983 if ((newsah = key_getsah(&saidx)) == NULL) { 4984 /* create a new SA header */ 4985 if ((newsah = key_newsah(&saidx)) == NULL) { 4986 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4987 return key_senderror(so, m, ENOBUFS); 4988 } 4989 } 4990 4991 /* set spidx if there */ 4992 /* XXX rewrite */ 4993 error = key_setident(newsah, m, mhp); 4994 if (error) { 4995 return key_senderror(so, m, error); 4996 } 4997 4998 /* create new SA entry. */ 4999 /* We can create new SA only if SPI is differenct. */ 5000 SAHTREE_LOCK(); 5001 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5002 SAHTREE_UNLOCK(); 5003 if (newsav != NULL) { 5004 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 5005 return key_senderror(so, m, EEXIST); 5006 } 5007 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 5008 if (newsav == NULL) { 5009 return key_senderror(so, m, error); 5010 } 5011 5012 /* check SA values to be mature. */ 5013 if ((error = key_mature(newsav)) != 0) { 5014 KEY_FREESAV(&newsav); 5015 return key_senderror(so, m, error); 5016 } 5017 5018 /* 5019 * don't call key_freesav() here, as we would like to keep the SA 5020 * in the database on success. 5021 */ 5022 5023 { 5024 struct mbuf *n; 5025 5026 /* set msg buf from mhp */ 5027 n = key_getmsgbuf_x1(m, mhp); 5028 if (n == NULL) { 5029 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5030 return key_senderror(so, m, ENOBUFS); 5031 } 5032 5033 m_freem(m); 5034 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5035 } 5036} 5037 5038/* m is retained */ 5039static int 5040key_setident(sah, m, mhp) 5041 struct secashead *sah; 5042 struct mbuf *m; 5043 const struct sadb_msghdr *mhp; 5044{ 5045 INIT_VNET_IPSEC(curvnet); 5046 const struct sadb_ident *idsrc, *iddst; 5047 int idsrclen, iddstlen; 5048 5049 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5050 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5051 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5052 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5053 5054 /* don't make buffer if not there */ 5055 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5056 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5057 sah->idents = NULL; 5058 sah->identd = NULL; 5059 return 0; 5060 } 5061 5062 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5063 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5064 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5065 return EINVAL; 5066 } 5067 5068 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5069 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5070 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5071 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5072 5073 /* validity check */ 5074 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5075 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5076 return EINVAL; 5077 } 5078 5079 switch (idsrc->sadb_ident_type) { 5080 case SADB_IDENTTYPE_PREFIX: 5081 case SADB_IDENTTYPE_FQDN: 5082 case SADB_IDENTTYPE_USERFQDN: 5083 default: 5084 /* XXX do nothing */ 5085 sah->idents = NULL; 5086 sah->identd = NULL; 5087 return 0; 5088 } 5089 5090 /* make structure */ 5091 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5092 if (sah->idents == NULL) { 5093 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5094 return ENOBUFS; 5095 } 5096 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5097 if (sah->identd == NULL) { 5098 free(sah->idents, M_IPSEC_MISC); 5099 sah->idents = NULL; 5100 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5101 return ENOBUFS; 5102 } 5103 sah->idents->type = idsrc->sadb_ident_type; 5104 sah->idents->id = idsrc->sadb_ident_id; 5105 5106 sah->identd->type = iddst->sadb_ident_type; 5107 sah->identd->id = iddst->sadb_ident_id; 5108 5109 return 0; 5110} 5111 5112/* 5113 * m will not be freed on return. 5114 * it is caller's responsibility to free the result. 5115 */ 5116static struct mbuf * 5117key_getmsgbuf_x1(m, mhp) 5118 struct mbuf *m; 5119 const struct sadb_msghdr *mhp; 5120{ 5121 struct mbuf *n; 5122 5123 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5124 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5125 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5126 5127 /* create new sadb_msg to reply. */ 5128 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5129 SADB_EXT_SA, SADB_X_EXT_SA2, 5130 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5131 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5132 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5133 if (!n) 5134 return NULL; 5135 5136 if (n->m_len < sizeof(struct sadb_msg)) { 5137 n = m_pullup(n, sizeof(struct sadb_msg)); 5138 if (n == NULL) 5139 return NULL; 5140 } 5141 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5142 mtod(n, struct sadb_msg *)->sadb_msg_len = 5143 PFKEY_UNIT64(n->m_pkthdr.len); 5144 5145 return n; 5146} 5147 5148static int key_delete_all __P((struct socket *, struct mbuf *, 5149 const struct sadb_msghdr *, u_int16_t)); 5150 5151/* 5152 * SADB_DELETE processing 5153 * receive 5154 * <base, SA(*), address(SD)> 5155 * from the ikmpd, and set SADB_SASTATE_DEAD, 5156 * and send, 5157 * <base, SA(*), address(SD)> 5158 * to the ikmpd. 5159 * 5160 * m will always be freed. 5161 */ 5162static int 5163key_delete(so, m, mhp) 5164 struct socket *so; 5165 struct mbuf *m; 5166 const struct sadb_msghdr *mhp; 5167{ 5168 INIT_VNET_IPSEC(curvnet); 5169 struct sadb_sa *sa0; 5170 struct sadb_address *src0, *dst0; 5171 struct secasindex saidx; 5172 struct secashead *sah; 5173 struct secasvar *sav = NULL; 5174 u_int16_t proto; 5175 5176 IPSEC_ASSERT(so != NULL, ("null socket")); 5177 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5178 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5179 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5180 5181 /* map satype to proto */ 5182 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5183 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5184 __func__)); 5185 return key_senderror(so, m, EINVAL); 5186 } 5187 5188 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5189 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5190 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5191 __func__)); 5192 return key_senderror(so, m, EINVAL); 5193 } 5194 5195 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5196 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5197 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5198 __func__)); 5199 return key_senderror(so, m, EINVAL); 5200 } 5201 5202 if (mhp->ext[SADB_EXT_SA] == NULL) { 5203 /* 5204 * Caller wants us to delete all non-LARVAL SAs 5205 * that match the src/dst. This is used during 5206 * IKE INITIAL-CONTACT. 5207 */ 5208 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5209 return key_delete_all(so, m, mhp, proto); 5210 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5211 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5212 __func__)); 5213 return key_senderror(so, m, EINVAL); 5214 } 5215 5216 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5217 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5218 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5219 5220 /* XXX boundary check against sa_len */ 5221 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5222 5223 /* get a SA header */ 5224 SAHTREE_LOCK(); 5225 LIST_FOREACH(sah, &V_sahtree, chain) { 5226 if (sah->state == SADB_SASTATE_DEAD) 5227 continue; 5228 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5229 continue; 5230 5231 /* get a SA with SPI. */ 5232 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5233 if (sav) 5234 break; 5235 } 5236 if (sah == NULL) { 5237 SAHTREE_UNLOCK(); 5238 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5239 return key_senderror(so, m, ENOENT); 5240 } 5241 5242 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5243 SAHTREE_UNLOCK(); 5244 KEY_FREESAV(&sav); 5245 5246 { 5247 struct mbuf *n; 5248 struct sadb_msg *newmsg; 5249 5250 /* create new sadb_msg to reply. */ 5251 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5252 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5253 if (!n) 5254 return key_senderror(so, m, ENOBUFS); 5255 5256 if (n->m_len < sizeof(struct sadb_msg)) { 5257 n = m_pullup(n, sizeof(struct sadb_msg)); 5258 if (n == NULL) 5259 return key_senderror(so, m, ENOBUFS); 5260 } 5261 newmsg = mtod(n, struct sadb_msg *); 5262 newmsg->sadb_msg_errno = 0; 5263 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5264 5265 m_freem(m); 5266 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5267 } 5268} 5269 5270/* 5271 * delete all SAs for src/dst. Called from key_delete(). 5272 */ 5273static int 5274key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5275 u_int16_t proto) 5276{ 5277 INIT_VNET_IPSEC(curvnet); 5278 struct sadb_address *src0, *dst0; 5279 struct secasindex saidx; 5280 struct secashead *sah; 5281 struct secasvar *sav, *nextsav; 5282 u_int stateidx, state; 5283 5284 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5285 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5286 5287 /* XXX boundary check against sa_len */ 5288 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5289 5290 SAHTREE_LOCK(); 5291 LIST_FOREACH(sah, &V_sahtree, chain) { 5292 if (sah->state == SADB_SASTATE_DEAD) 5293 continue; 5294 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5295 continue; 5296 5297 /* Delete all non-LARVAL SAs. */ 5298 for (stateidx = 0; 5299 stateidx < _ARRAYLEN(saorder_state_alive); 5300 stateidx++) { 5301 state = saorder_state_alive[stateidx]; 5302 if (state == SADB_SASTATE_LARVAL) 5303 continue; 5304 for (sav = LIST_FIRST(&sah->savtree[state]); 5305 sav != NULL; sav = nextsav) { 5306 nextsav = LIST_NEXT(sav, chain); 5307 /* sanity check */ 5308 if (sav->state != state) { 5309 ipseclog((LOG_DEBUG, "%s: invalid " 5310 "sav->state (queue %d SA %d)\n", 5311 __func__, state, sav->state)); 5312 continue; 5313 } 5314 5315 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5316 KEY_FREESAV(&sav); 5317 } 5318 } 5319 } 5320 SAHTREE_UNLOCK(); 5321 { 5322 struct mbuf *n; 5323 struct sadb_msg *newmsg; 5324 5325 /* create new sadb_msg to reply. */ 5326 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5327 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5328 if (!n) 5329 return key_senderror(so, m, ENOBUFS); 5330 5331 if (n->m_len < sizeof(struct sadb_msg)) { 5332 n = m_pullup(n, sizeof(struct sadb_msg)); 5333 if (n == NULL) 5334 return key_senderror(so, m, ENOBUFS); 5335 } 5336 newmsg = mtod(n, struct sadb_msg *); 5337 newmsg->sadb_msg_errno = 0; 5338 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5339 5340 m_freem(m); 5341 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5342 } 5343} 5344 5345/* 5346 * SADB_GET processing 5347 * receive 5348 * <base, SA(*), address(SD)> 5349 * from the ikmpd, and get a SP and a SA to respond, 5350 * and send, 5351 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5352 * (identity(SD),) (sensitivity)> 5353 * to the ikmpd. 5354 * 5355 * m will always be freed. 5356 */ 5357static int 5358key_get(so, m, mhp) 5359 struct socket *so; 5360 struct mbuf *m; 5361 const struct sadb_msghdr *mhp; 5362{ 5363 INIT_VNET_IPSEC(curvnet); 5364 struct sadb_sa *sa0; 5365 struct sadb_address *src0, *dst0; 5366 struct secasindex saidx; 5367 struct secashead *sah; 5368 struct secasvar *sav = NULL; 5369 u_int16_t proto; 5370 5371 IPSEC_ASSERT(so != NULL, ("null socket")); 5372 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5373 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5374 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5375 5376 /* map satype to proto */ 5377 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5378 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5379 __func__)); 5380 return key_senderror(so, m, EINVAL); 5381 } 5382 5383 if (mhp->ext[SADB_EXT_SA] == NULL || 5384 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5385 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5386 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5387 __func__)); 5388 return key_senderror(so, m, EINVAL); 5389 } 5390 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5391 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5392 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5393 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5394 __func__)); 5395 return key_senderror(so, m, EINVAL); 5396 } 5397 5398 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5399 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5400 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5401 5402 /* XXX boundary check against sa_len */ 5403 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5404 5405 /* get a SA header */ 5406 SAHTREE_LOCK(); 5407 LIST_FOREACH(sah, &V_sahtree, chain) { 5408 if (sah->state == SADB_SASTATE_DEAD) 5409 continue; 5410 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5411 continue; 5412 5413 /* get a SA with SPI. */ 5414 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5415 if (sav) 5416 break; 5417 } 5418 SAHTREE_UNLOCK(); 5419 if (sah == NULL) { 5420 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5421 return key_senderror(so, m, ENOENT); 5422 } 5423 5424 { 5425 struct mbuf *n; 5426 u_int8_t satype; 5427 5428 /* map proto to satype */ 5429 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5430 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5431 __func__)); 5432 return key_senderror(so, m, EINVAL); 5433 } 5434 5435 /* create new sadb_msg to reply. */ 5436 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5437 mhp->msg->sadb_msg_pid); 5438 if (!n) 5439 return key_senderror(so, m, ENOBUFS); 5440 5441 m_freem(m); 5442 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5443 } 5444} 5445 5446/* XXX make it sysctl-configurable? */ 5447static void 5448key_getcomb_setlifetime(comb) 5449 struct sadb_comb *comb; 5450{ 5451 5452 comb->sadb_comb_soft_allocations = 1; 5453 comb->sadb_comb_hard_allocations = 1; 5454 comb->sadb_comb_soft_bytes = 0; 5455 comb->sadb_comb_hard_bytes = 0; 5456 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5457 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5458 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5459 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5460} 5461 5462/* 5463 * XXX reorder combinations by preference 5464 * XXX no idea if the user wants ESP authentication or not 5465 */ 5466static struct mbuf * 5467key_getcomb_esp() 5468{ 5469 INIT_VNET_IPSEC(curvnet); 5470 struct sadb_comb *comb; 5471 struct enc_xform *algo; 5472 struct mbuf *result = NULL, *m, *n; 5473 int encmin; 5474 int i, off, o; 5475 int totlen; 5476 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5477 5478 m = NULL; 5479 for (i = 1; i <= SADB_EALG_MAX; i++) { 5480 algo = esp_algorithm_lookup(i); 5481 if (algo == NULL) 5482 continue; 5483 5484 /* discard algorithms with key size smaller than system min */ 5485 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5486 continue; 5487 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5488 encmin = V_ipsec_esp_keymin; 5489 else 5490 encmin = _BITS(algo->minkey); 5491 5492 if (V_ipsec_esp_auth) 5493 m = key_getcomb_ah(); 5494 else { 5495 IPSEC_ASSERT(l <= MLEN, 5496 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5497 MGET(m, M_DONTWAIT, MT_DATA); 5498 if (m) { 5499 M_ALIGN(m, l); 5500 m->m_len = l; 5501 m->m_next = NULL; 5502 bzero(mtod(m, caddr_t), m->m_len); 5503 } 5504 } 5505 if (!m) 5506 goto fail; 5507 5508 totlen = 0; 5509 for (n = m; n; n = n->m_next) 5510 totlen += n->m_len; 5511 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5512 5513 for (off = 0; off < totlen; off += l) { 5514 n = m_pulldown(m, off, l, &o); 5515 if (!n) { 5516 /* m is already freed */ 5517 goto fail; 5518 } 5519 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5520 bzero(comb, sizeof(*comb)); 5521 key_getcomb_setlifetime(comb); 5522 comb->sadb_comb_encrypt = i; 5523 comb->sadb_comb_encrypt_minbits = encmin; 5524 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5525 } 5526 5527 if (!result) 5528 result = m; 5529 else 5530 m_cat(result, m); 5531 } 5532 5533 return result; 5534 5535 fail: 5536 if (result) 5537 m_freem(result); 5538 return NULL; 5539} 5540 5541static void 5542key_getsizes_ah( 5543 const struct auth_hash *ah, 5544 int alg, 5545 u_int16_t* min, 5546 u_int16_t* max) 5547{ 5548 INIT_VNET_IPSEC(curvnet); 5549 5550 *min = *max = ah->keysize; 5551 if (ah->keysize == 0) { 5552 /* 5553 * Transform takes arbitrary key size but algorithm 5554 * key size is restricted. Enforce this here. 5555 */ 5556 switch (alg) { 5557 case SADB_X_AALG_MD5: *min = *max = 16; break; 5558 case SADB_X_AALG_SHA: *min = *max = 20; break; 5559 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5560 default: 5561 DPRINTF(("%s: unknown AH algorithm %u\n", 5562 __func__, alg)); 5563 break; 5564 } 5565 } 5566} 5567 5568/* 5569 * XXX reorder combinations by preference 5570 */ 5571static struct mbuf * 5572key_getcomb_ah() 5573{ 5574 INIT_VNET_IPSEC(curvnet); 5575 struct sadb_comb *comb; 5576 struct auth_hash *algo; 5577 struct mbuf *m; 5578 u_int16_t minkeysize, maxkeysize; 5579 int i; 5580 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5581 5582 m = NULL; 5583 for (i = 1; i <= SADB_AALG_MAX; i++) { 5584#if 1 5585 /* we prefer HMAC algorithms, not old algorithms */ 5586 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5587 continue; 5588#endif 5589 algo = ah_algorithm_lookup(i); 5590 if (!algo) 5591 continue; 5592 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5593 /* discard algorithms with key size smaller than system min */ 5594 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5595 continue; 5596 5597 if (!m) { 5598 IPSEC_ASSERT(l <= MLEN, 5599 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5600 MGET(m, M_DONTWAIT, MT_DATA); 5601 if (m) { 5602 M_ALIGN(m, l); 5603 m->m_len = l; 5604 m->m_next = NULL; 5605 } 5606 } else 5607 M_PREPEND(m, l, M_DONTWAIT); 5608 if (!m) 5609 return NULL; 5610 5611 comb = mtod(m, struct sadb_comb *); 5612 bzero(comb, sizeof(*comb)); 5613 key_getcomb_setlifetime(comb); 5614 comb->sadb_comb_auth = i; 5615 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5616 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5617 } 5618 5619 return m; 5620} 5621 5622/* 5623 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5624 * XXX reorder combinations by preference 5625 */ 5626static struct mbuf * 5627key_getcomb_ipcomp() 5628{ 5629 struct sadb_comb *comb; 5630 struct comp_algo *algo; 5631 struct mbuf *m; 5632 int i; 5633 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5634 5635 m = NULL; 5636 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5637 algo = ipcomp_algorithm_lookup(i); 5638 if (!algo) 5639 continue; 5640 5641 if (!m) { 5642 IPSEC_ASSERT(l <= MLEN, 5643 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5644 MGET(m, M_DONTWAIT, MT_DATA); 5645 if (m) { 5646 M_ALIGN(m, l); 5647 m->m_len = l; 5648 m->m_next = NULL; 5649 } 5650 } else 5651 M_PREPEND(m, l, M_DONTWAIT); 5652 if (!m) 5653 return NULL; 5654 5655 comb = mtod(m, struct sadb_comb *); 5656 bzero(comb, sizeof(*comb)); 5657 key_getcomb_setlifetime(comb); 5658 comb->sadb_comb_encrypt = i; 5659 /* what should we set into sadb_comb_*_{min,max}bits? */ 5660 } 5661 5662 return m; 5663} 5664 5665/* 5666 * XXX no way to pass mode (transport/tunnel) to userland 5667 * XXX replay checking? 5668 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5669 */ 5670static struct mbuf * 5671key_getprop(saidx) 5672 const struct secasindex *saidx; 5673{ 5674 struct sadb_prop *prop; 5675 struct mbuf *m, *n; 5676 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5677 int totlen; 5678 5679 switch (saidx->proto) { 5680 case IPPROTO_ESP: 5681 m = key_getcomb_esp(); 5682 break; 5683 case IPPROTO_AH: 5684 m = key_getcomb_ah(); 5685 break; 5686 case IPPROTO_IPCOMP: 5687 m = key_getcomb_ipcomp(); 5688 break; 5689 default: 5690 return NULL; 5691 } 5692 5693 if (!m) 5694 return NULL; 5695 M_PREPEND(m, l, M_DONTWAIT); 5696 if (!m) 5697 return NULL; 5698 5699 totlen = 0; 5700 for (n = m; n; n = n->m_next) 5701 totlen += n->m_len; 5702 5703 prop = mtod(m, struct sadb_prop *); 5704 bzero(prop, sizeof(*prop)); 5705 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5706 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5707 prop->sadb_prop_replay = 32; /* XXX */ 5708 5709 return m; 5710} 5711 5712/* 5713 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5714 * send 5715 * <base, SA, address(SD), (address(P)), x_policy, 5716 * (identity(SD),) (sensitivity,) proposal> 5717 * to KMD, and expect to receive 5718 * <base> with SADB_ACQUIRE if error occured, 5719 * or 5720 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5721 * from KMD by PF_KEY. 5722 * 5723 * XXX x_policy is outside of RFC2367 (KAME extension). 5724 * XXX sensitivity is not supported. 5725 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5726 * see comment for key_getcomb_ipcomp(). 5727 * 5728 * OUT: 5729 * 0 : succeed 5730 * others: error number 5731 */ 5732static int 5733key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5734{ 5735 INIT_VNET_IPSEC(curvnet); 5736 struct mbuf *result = NULL, *m; 5737 struct secacq *newacq; 5738 u_int8_t satype; 5739 int error = -1; 5740 u_int32_t seq; 5741 5742 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5743 satype = key_proto2satype(saidx->proto); 5744 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5745 5746 /* 5747 * We never do anything about acquirng SA. There is anather 5748 * solution that kernel blocks to send SADB_ACQUIRE message until 5749 * getting something message from IKEd. In later case, to be 5750 * managed with ACQUIRING list. 5751 */ 5752 /* Get an entry to check whether sending message or not. */ 5753 if ((newacq = key_getacq(saidx)) != NULL) { 5754 if (V_key_blockacq_count < newacq->count) { 5755 /* reset counter and do send message. */ 5756 newacq->count = 0; 5757 } else { 5758 /* increment counter and do nothing. */ 5759 newacq->count++; 5760 return 0; 5761 } 5762 } else { 5763 /* make new entry for blocking to send SADB_ACQUIRE. */ 5764 if ((newacq = key_newacq(saidx)) == NULL) 5765 return ENOBUFS; 5766 } 5767 5768 5769 seq = newacq->seq; 5770 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5771 if (!m) { 5772 error = ENOBUFS; 5773 goto fail; 5774 } 5775 result = m; 5776 5777 /* set sadb_address for saidx's. */ 5778 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5779 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5780 if (!m) { 5781 error = ENOBUFS; 5782 goto fail; 5783 } 5784 m_cat(result, m); 5785 5786 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5787 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5788 if (!m) { 5789 error = ENOBUFS; 5790 goto fail; 5791 } 5792 m_cat(result, m); 5793 5794 /* XXX proxy address (optional) */ 5795 5796 /* set sadb_x_policy */ 5797 if (sp) { 5798 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5799 if (!m) { 5800 error = ENOBUFS; 5801 goto fail; 5802 } 5803 m_cat(result, m); 5804 } 5805 5806 /* XXX identity (optional) */ 5807#if 0 5808 if (idexttype && fqdn) { 5809 /* create identity extension (FQDN) */ 5810 struct sadb_ident *id; 5811 int fqdnlen; 5812 5813 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5814 id = (struct sadb_ident *)p; 5815 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5816 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5817 id->sadb_ident_exttype = idexttype; 5818 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5819 bcopy(fqdn, id + 1, fqdnlen); 5820 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5821 } 5822 5823 if (idexttype) { 5824 /* create identity extension (USERFQDN) */ 5825 struct sadb_ident *id; 5826 int userfqdnlen; 5827 5828 if (userfqdn) { 5829 /* +1 for terminating-NUL */ 5830 userfqdnlen = strlen(userfqdn) + 1; 5831 } else 5832 userfqdnlen = 0; 5833 id = (struct sadb_ident *)p; 5834 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5835 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5836 id->sadb_ident_exttype = idexttype; 5837 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5838 /* XXX is it correct? */ 5839 if (curproc && curproc->p_cred) 5840 id->sadb_ident_id = curproc->p_cred->p_ruid; 5841 if (userfqdn && userfqdnlen) 5842 bcopy(userfqdn, id + 1, userfqdnlen); 5843 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5844 } 5845#endif 5846 5847 /* XXX sensitivity (optional) */ 5848 5849 /* create proposal/combination extension */ 5850 m = key_getprop(saidx); 5851#if 0 5852 /* 5853 * spec conformant: always attach proposal/combination extension, 5854 * the problem is that we have no way to attach it for ipcomp, 5855 * due to the way sadb_comb is declared in RFC2367. 5856 */ 5857 if (!m) { 5858 error = ENOBUFS; 5859 goto fail; 5860 } 5861 m_cat(result, m); 5862#else 5863 /* 5864 * outside of spec; make proposal/combination extension optional. 5865 */ 5866 if (m) 5867 m_cat(result, m); 5868#endif 5869 5870 if ((result->m_flags & M_PKTHDR) == 0) { 5871 error = EINVAL; 5872 goto fail; 5873 } 5874 5875 if (result->m_len < sizeof(struct sadb_msg)) { 5876 result = m_pullup(result, sizeof(struct sadb_msg)); 5877 if (result == NULL) { 5878 error = ENOBUFS; 5879 goto fail; 5880 } 5881 } 5882 5883 result->m_pkthdr.len = 0; 5884 for (m = result; m; m = m->m_next) 5885 result->m_pkthdr.len += m->m_len; 5886 5887 mtod(result, struct sadb_msg *)->sadb_msg_len = 5888 PFKEY_UNIT64(result->m_pkthdr.len); 5889 5890 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5891 5892 fail: 5893 if (result) 5894 m_freem(result); 5895 return error; 5896} 5897 5898static struct secacq * 5899key_newacq(const struct secasindex *saidx) 5900{ 5901 INIT_VNET_IPSEC(curvnet); 5902 struct secacq *newacq; 5903 5904 /* get new entry */ 5905 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5906 if (newacq == NULL) { 5907 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5908 return NULL; 5909 } 5910 5911 /* copy secindex */ 5912 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5913 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5914 newacq->created = time_second; 5915 newacq->count = 0; 5916 5917 /* add to acqtree */ 5918 ACQ_LOCK(); 5919 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5920 ACQ_UNLOCK(); 5921 5922 return newacq; 5923} 5924 5925static struct secacq * 5926key_getacq(const struct secasindex *saidx) 5927{ 5928 INIT_VNET_IPSEC(curvnet); 5929 struct secacq *acq; 5930 5931 ACQ_LOCK(); 5932 LIST_FOREACH(acq, &V_acqtree, chain) { 5933 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5934 break; 5935 } 5936 ACQ_UNLOCK(); 5937 5938 return acq; 5939} 5940 5941static struct secacq * 5942key_getacqbyseq(seq) 5943 u_int32_t seq; 5944{ 5945 INIT_VNET_IPSEC(curvnet); 5946 struct secacq *acq; 5947 5948 ACQ_LOCK(); 5949 LIST_FOREACH(acq, &V_acqtree, chain) { 5950 if (acq->seq == seq) 5951 break; 5952 } 5953 ACQ_UNLOCK(); 5954 5955 return acq; 5956} 5957 5958static struct secspacq * 5959key_newspacq(spidx) 5960 struct secpolicyindex *spidx; 5961{ 5962 INIT_VNET_IPSEC(curvnet); 5963 struct secspacq *acq; 5964 5965 /* get new entry */ 5966 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5967 if (acq == NULL) { 5968 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5969 return NULL; 5970 } 5971 5972 /* copy secindex */ 5973 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5974 acq->created = time_second; 5975 acq->count = 0; 5976 5977 /* add to spacqtree */ 5978 SPACQ_LOCK(); 5979 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5980 SPACQ_UNLOCK(); 5981 5982 return acq; 5983} 5984 5985static struct secspacq * 5986key_getspacq(spidx) 5987 struct secpolicyindex *spidx; 5988{ 5989 INIT_VNET_IPSEC(curvnet); 5990 struct secspacq *acq; 5991 5992 SPACQ_LOCK(); 5993 LIST_FOREACH(acq, &V_spacqtree, chain) { 5994 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5995 /* NB: return holding spacq_lock */ 5996 return acq; 5997 } 5998 } 5999 SPACQ_UNLOCK(); 6000 6001 return NULL; 6002} 6003 6004/* 6005 * SADB_ACQUIRE processing, 6006 * in first situation, is receiving 6007 * <base> 6008 * from the ikmpd, and clear sequence of its secasvar entry. 6009 * 6010 * In second situation, is receiving 6011 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6012 * from a user land process, and return 6013 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6014 * to the socket. 6015 * 6016 * m will always be freed. 6017 */ 6018static int 6019key_acquire2(so, m, mhp) 6020 struct socket *so; 6021 struct mbuf *m; 6022 const struct sadb_msghdr *mhp; 6023{ 6024 INIT_VNET_IPSEC(curvnet); 6025 const struct sadb_address *src0, *dst0; 6026 struct secasindex saidx; 6027 struct secashead *sah; 6028 u_int16_t proto; 6029 int error; 6030 6031 IPSEC_ASSERT(so != NULL, ("null socket")); 6032 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6033 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6034 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6035 6036 /* 6037 * Error message from KMd. 6038 * We assume that if error was occured in IKEd, the length of PFKEY 6039 * message is equal to the size of sadb_msg structure. 6040 * We do not raise error even if error occured in this function. 6041 */ 6042 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6043 struct secacq *acq; 6044 6045 /* check sequence number */ 6046 if (mhp->msg->sadb_msg_seq == 0) { 6047 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6048 "number.\n", __func__)); 6049 m_freem(m); 6050 return 0; 6051 } 6052 6053 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6054 /* 6055 * the specified larval SA is already gone, or we got 6056 * a bogus sequence number. we can silently ignore it. 6057 */ 6058 m_freem(m); 6059 return 0; 6060 } 6061 6062 /* reset acq counter in order to deletion by timehander. */ 6063 acq->created = time_second; 6064 acq->count = 0; 6065 m_freem(m); 6066 return 0; 6067 } 6068 6069 /* 6070 * This message is from user land. 6071 */ 6072 6073 /* map satype to proto */ 6074 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6075 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6076 __func__)); 6077 return key_senderror(so, m, EINVAL); 6078 } 6079 6080 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6081 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6082 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6083 /* error */ 6084 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6085 __func__)); 6086 return key_senderror(so, m, EINVAL); 6087 } 6088 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6089 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6090 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6091 /* error */ 6092 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6093 __func__)); 6094 return key_senderror(so, m, EINVAL); 6095 } 6096 6097 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6098 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6099 6100 /* XXX boundary check against sa_len */ 6101 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6102 6103 /* get a SA index */ 6104 SAHTREE_LOCK(); 6105 LIST_FOREACH(sah, &V_sahtree, chain) { 6106 if (sah->state == SADB_SASTATE_DEAD) 6107 continue; 6108 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6109 break; 6110 } 6111 SAHTREE_UNLOCK(); 6112 if (sah != NULL) { 6113 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6114 return key_senderror(so, m, EEXIST); 6115 } 6116 6117 error = key_acquire(&saidx, NULL); 6118 if (error != 0) { 6119 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6120 __func__, mhp->msg->sadb_msg_errno)); 6121 return key_senderror(so, m, error); 6122 } 6123 6124 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6125} 6126 6127/* 6128 * SADB_REGISTER processing. 6129 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6130 * receive 6131 * <base> 6132 * from the ikmpd, and register a socket to send PF_KEY messages, 6133 * and send 6134 * <base, supported> 6135 * to KMD by PF_KEY. 6136 * If socket is detached, must free from regnode. 6137 * 6138 * m will always be freed. 6139 */ 6140static int 6141key_register(so, m, mhp) 6142 struct socket *so; 6143 struct mbuf *m; 6144 const struct sadb_msghdr *mhp; 6145{ 6146 INIT_VNET_IPSEC(curvnet); 6147 struct secreg *reg, *newreg = 0; 6148 6149 IPSEC_ASSERT(so != NULL, ("null socket")); 6150 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6151 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6152 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6153 6154 /* check for invalid register message */ 6155 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6156 return key_senderror(so, m, EINVAL); 6157 6158 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6159 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6160 goto setmsg; 6161 6162 /* check whether existing or not */ 6163 REGTREE_LOCK(); 6164 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6165 if (reg->so == so) { 6166 REGTREE_UNLOCK(); 6167 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6168 __func__)); 6169 return key_senderror(so, m, EEXIST); 6170 } 6171 } 6172 6173 /* create regnode */ 6174 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6175 if (newreg == NULL) { 6176 REGTREE_UNLOCK(); 6177 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6178 return key_senderror(so, m, ENOBUFS); 6179 } 6180 6181 newreg->so = so; 6182 ((struct keycb *)sotorawcb(so))->kp_registered++; 6183 6184 /* add regnode to regtree. */ 6185 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6186 REGTREE_UNLOCK(); 6187 6188 setmsg: 6189 { 6190 struct mbuf *n; 6191 struct sadb_msg *newmsg; 6192 struct sadb_supported *sup; 6193 u_int len, alen, elen; 6194 int off; 6195 int i; 6196 struct sadb_alg *alg; 6197 6198 /* create new sadb_msg to reply. */ 6199 alen = 0; 6200 for (i = 1; i <= SADB_AALG_MAX; i++) { 6201 if (ah_algorithm_lookup(i)) 6202 alen += sizeof(struct sadb_alg); 6203 } 6204 if (alen) 6205 alen += sizeof(struct sadb_supported); 6206 elen = 0; 6207 for (i = 1; i <= SADB_EALG_MAX; i++) { 6208 if (esp_algorithm_lookup(i)) 6209 elen += sizeof(struct sadb_alg); 6210 } 6211 if (elen) 6212 elen += sizeof(struct sadb_supported); 6213 6214 len = sizeof(struct sadb_msg) + alen + elen; 6215 6216 if (len > MCLBYTES) 6217 return key_senderror(so, m, ENOBUFS); 6218 6219 MGETHDR(n, M_DONTWAIT, MT_DATA); 6220 if (len > MHLEN) { 6221 MCLGET(n, M_DONTWAIT); 6222 if ((n->m_flags & M_EXT) == 0) { 6223 m_freem(n); 6224 n = NULL; 6225 } 6226 } 6227 if (!n) 6228 return key_senderror(so, m, ENOBUFS); 6229 6230 n->m_pkthdr.len = n->m_len = len; 6231 n->m_next = NULL; 6232 off = 0; 6233 6234 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6235 newmsg = mtod(n, struct sadb_msg *); 6236 newmsg->sadb_msg_errno = 0; 6237 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6238 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6239 6240 /* for authentication algorithm */ 6241 if (alen) { 6242 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6243 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6244 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6245 off += PFKEY_ALIGN8(sizeof(*sup)); 6246 6247 for (i = 1; i <= SADB_AALG_MAX; i++) { 6248 struct auth_hash *aalgo; 6249 u_int16_t minkeysize, maxkeysize; 6250 6251 aalgo = ah_algorithm_lookup(i); 6252 if (!aalgo) 6253 continue; 6254 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6255 alg->sadb_alg_id = i; 6256 alg->sadb_alg_ivlen = 0; 6257 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6258 alg->sadb_alg_minbits = _BITS(minkeysize); 6259 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6260 off += PFKEY_ALIGN8(sizeof(*alg)); 6261 } 6262 } 6263 6264 /* for encryption algorithm */ 6265 if (elen) { 6266 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6267 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6268 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6269 off += PFKEY_ALIGN8(sizeof(*sup)); 6270 6271 for (i = 1; i <= SADB_EALG_MAX; i++) { 6272 struct enc_xform *ealgo; 6273 6274 ealgo = esp_algorithm_lookup(i); 6275 if (!ealgo) 6276 continue; 6277 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6278 alg->sadb_alg_id = i; 6279 alg->sadb_alg_ivlen = ealgo->blocksize; 6280 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6281 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6282 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6283 } 6284 } 6285 6286 IPSEC_ASSERT(off == len, 6287 ("length assumption failed (off %u len %u)", off, len)); 6288 6289 m_freem(m); 6290 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6291 } 6292} 6293 6294/* 6295 * free secreg entry registered. 6296 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6297 */ 6298void 6299key_freereg(struct socket *so) 6300{ 6301 INIT_VNET_IPSEC(curvnet); 6302 struct secreg *reg; 6303 int i; 6304 6305 IPSEC_ASSERT(so != NULL, ("NULL so")); 6306 6307 /* 6308 * check whether existing or not. 6309 * check all type of SA, because there is a potential that 6310 * one socket is registered to multiple type of SA. 6311 */ 6312 REGTREE_LOCK(); 6313 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6314 LIST_FOREACH(reg, &V_regtree[i], chain) { 6315 if (reg->so == so && __LIST_CHAINED(reg)) { 6316 LIST_REMOVE(reg, chain); 6317 free(reg, M_IPSEC_SAR); 6318 break; 6319 } 6320 } 6321 } 6322 REGTREE_UNLOCK(); 6323} 6324 6325/* 6326 * SADB_EXPIRE processing 6327 * send 6328 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6329 * to KMD by PF_KEY. 6330 * NOTE: We send only soft lifetime extension. 6331 * 6332 * OUT: 0 : succeed 6333 * others : error number 6334 */ 6335static int 6336key_expire(struct secasvar *sav) 6337{ 6338 int s; 6339 int satype; 6340 struct mbuf *result = NULL, *m; 6341 int len; 6342 int error = -1; 6343 struct sadb_lifetime *lt; 6344 6345 /* XXX: Why do we lock ? */ 6346 s = splnet(); /*called from softclock()*/ 6347 6348 IPSEC_ASSERT (sav != NULL, ("null sav")); 6349 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6350 6351 /* set msg header */ 6352 satype = key_proto2satype(sav->sah->saidx.proto); 6353 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6354 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6355 if (!m) { 6356 error = ENOBUFS; 6357 goto fail; 6358 } 6359 result = m; 6360 6361 /* create SA extension */ 6362 m = key_setsadbsa(sav); 6363 if (!m) { 6364 error = ENOBUFS; 6365 goto fail; 6366 } 6367 m_cat(result, m); 6368 6369 /* create SA extension */ 6370 m = key_setsadbxsa2(sav->sah->saidx.mode, 6371 sav->replay ? sav->replay->count : 0, 6372 sav->sah->saidx.reqid); 6373 if (!m) { 6374 error = ENOBUFS; 6375 goto fail; 6376 } 6377 m_cat(result, m); 6378 6379 /* create lifetime extension (current and soft) */ 6380 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6381 m = key_alloc_mbuf(len); 6382 if (!m || m->m_next) { /*XXX*/ 6383 if (m) 6384 m_freem(m); 6385 error = ENOBUFS; 6386 goto fail; 6387 } 6388 bzero(mtod(m, caddr_t), len); 6389 lt = mtod(m, struct sadb_lifetime *); 6390 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6391 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6392 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6393 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6394 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6395 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6396 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6397 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6398 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6399 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6400 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6401 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6402 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6403 m_cat(result, m); 6404 6405 /* set sadb_address for source */ 6406 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6407 &sav->sah->saidx.src.sa, 6408 FULLMASK, IPSEC_ULPROTO_ANY); 6409 if (!m) { 6410 error = ENOBUFS; 6411 goto fail; 6412 } 6413 m_cat(result, m); 6414 6415 /* set sadb_address for destination */ 6416 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6417 &sav->sah->saidx.dst.sa, 6418 FULLMASK, IPSEC_ULPROTO_ANY); 6419 if (!m) { 6420 error = ENOBUFS; 6421 goto fail; 6422 } 6423 m_cat(result, m); 6424 6425 if ((result->m_flags & M_PKTHDR) == 0) { 6426 error = EINVAL; 6427 goto fail; 6428 } 6429 6430 if (result->m_len < sizeof(struct sadb_msg)) { 6431 result = m_pullup(result, sizeof(struct sadb_msg)); 6432 if (result == NULL) { 6433 error = ENOBUFS; 6434 goto fail; 6435 } 6436 } 6437 6438 result->m_pkthdr.len = 0; 6439 for (m = result; m; m = m->m_next) 6440 result->m_pkthdr.len += m->m_len; 6441 6442 mtod(result, struct sadb_msg *)->sadb_msg_len = 6443 PFKEY_UNIT64(result->m_pkthdr.len); 6444 6445 splx(s); 6446 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6447 6448 fail: 6449 if (result) 6450 m_freem(result); 6451 splx(s); 6452 return error; 6453} 6454 6455/* 6456 * SADB_FLUSH processing 6457 * receive 6458 * <base> 6459 * from the ikmpd, and free all entries in secastree. 6460 * and send, 6461 * <base> 6462 * to the ikmpd. 6463 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6464 * 6465 * m will always be freed. 6466 */ 6467static int 6468key_flush(so, m, mhp) 6469 struct socket *so; 6470 struct mbuf *m; 6471 const struct sadb_msghdr *mhp; 6472{ 6473 INIT_VNET_IPSEC(curvnet); 6474 struct sadb_msg *newmsg; 6475 struct secashead *sah, *nextsah; 6476 struct secasvar *sav, *nextsav; 6477 u_int16_t proto; 6478 u_int8_t state; 6479 u_int stateidx; 6480 6481 IPSEC_ASSERT(so != NULL, ("null socket")); 6482 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6483 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6484 6485 /* map satype to proto */ 6486 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6487 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6488 __func__)); 6489 return key_senderror(so, m, EINVAL); 6490 } 6491 6492 /* no SATYPE specified, i.e. flushing all SA. */ 6493 SAHTREE_LOCK(); 6494 for (sah = LIST_FIRST(&V_sahtree); 6495 sah != NULL; 6496 sah = nextsah) { 6497 nextsah = LIST_NEXT(sah, chain); 6498 6499 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6500 && proto != sah->saidx.proto) 6501 continue; 6502 6503 for (stateidx = 0; 6504 stateidx < _ARRAYLEN(saorder_state_alive); 6505 stateidx++) { 6506 state = saorder_state_any[stateidx]; 6507 for (sav = LIST_FIRST(&sah->savtree[state]); 6508 sav != NULL; 6509 sav = nextsav) { 6510 6511 nextsav = LIST_NEXT(sav, chain); 6512 6513 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6514 KEY_FREESAV(&sav); 6515 } 6516 } 6517 6518 sah->state = SADB_SASTATE_DEAD; 6519 } 6520 SAHTREE_UNLOCK(); 6521 6522 if (m->m_len < sizeof(struct sadb_msg) || 6523 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6524 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6525 return key_senderror(so, m, ENOBUFS); 6526 } 6527 6528 if (m->m_next) 6529 m_freem(m->m_next); 6530 m->m_next = NULL; 6531 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6532 newmsg = mtod(m, struct sadb_msg *); 6533 newmsg->sadb_msg_errno = 0; 6534 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6535 6536 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6537} 6538 6539/* 6540 * SADB_DUMP processing 6541 * dump all entries including status of DEAD in SAD. 6542 * receive 6543 * <base> 6544 * from the ikmpd, and dump all secasvar leaves 6545 * and send, 6546 * <base> ..... 6547 * to the ikmpd. 6548 * 6549 * m will always be freed. 6550 */ 6551static int 6552key_dump(so, m, mhp) 6553 struct socket *so; 6554 struct mbuf *m; 6555 const struct sadb_msghdr *mhp; 6556{ 6557 INIT_VNET_IPSEC(curvnet); 6558 struct secashead *sah; 6559 struct secasvar *sav; 6560 u_int16_t proto; 6561 u_int stateidx; 6562 u_int8_t satype; 6563 u_int8_t state; 6564 int cnt; 6565 struct sadb_msg *newmsg; 6566 struct mbuf *n; 6567 6568 IPSEC_ASSERT(so != NULL, ("null socket")); 6569 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6570 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6571 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6572 6573 /* map satype to proto */ 6574 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6575 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6576 __func__)); 6577 return key_senderror(so, m, EINVAL); 6578 } 6579 6580 /* count sav entries to be sent to the userland. */ 6581 cnt = 0; 6582 SAHTREE_LOCK(); 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 for (stateidx = 0; 6589 stateidx < _ARRAYLEN(saorder_state_any); 6590 stateidx++) { 6591 state = saorder_state_any[stateidx]; 6592 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6593 cnt++; 6594 } 6595 } 6596 } 6597 6598 if (cnt == 0) { 6599 SAHTREE_UNLOCK(); 6600 return key_senderror(so, m, ENOENT); 6601 } 6602 6603 /* send this to the userland, one at a time. */ 6604 newmsg = NULL; 6605 LIST_FOREACH(sah, &V_sahtree, chain) { 6606 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6607 && proto != sah->saidx.proto) 6608 continue; 6609 6610 /* map proto to satype */ 6611 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6612 SAHTREE_UNLOCK(); 6613 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6614 "SAD.\n", __func__)); 6615 return key_senderror(so, m, EINVAL); 6616 } 6617 6618 for (stateidx = 0; 6619 stateidx < _ARRAYLEN(saorder_state_any); 6620 stateidx++) { 6621 state = saorder_state_any[stateidx]; 6622 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6623 n = key_setdumpsa(sav, SADB_DUMP, satype, 6624 --cnt, mhp->msg->sadb_msg_pid); 6625 if (!n) { 6626 SAHTREE_UNLOCK(); 6627 return key_senderror(so, m, ENOBUFS); 6628 } 6629 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6630 } 6631 } 6632 } 6633 SAHTREE_UNLOCK(); 6634 6635 m_freem(m); 6636 return 0; 6637} 6638 6639/* 6640 * SADB_X_PROMISC processing 6641 * 6642 * m will always be freed. 6643 */ 6644static int 6645key_promisc(so, m, mhp) 6646 struct socket *so; 6647 struct mbuf *m; 6648 const struct sadb_msghdr *mhp; 6649{ 6650 int olen; 6651 6652 IPSEC_ASSERT(so != NULL, ("null socket")); 6653 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6654 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6655 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6656 6657 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6658 6659 if (olen < sizeof(struct sadb_msg)) { 6660#if 1 6661 return key_senderror(so, m, EINVAL); 6662#else 6663 m_freem(m); 6664 return 0; 6665#endif 6666 } else if (olen == sizeof(struct sadb_msg)) { 6667 /* enable/disable promisc mode */ 6668 struct keycb *kp; 6669 6670 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6671 return key_senderror(so, m, EINVAL); 6672 mhp->msg->sadb_msg_errno = 0; 6673 switch (mhp->msg->sadb_msg_satype) { 6674 case 0: 6675 case 1: 6676 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6677 break; 6678 default: 6679 return key_senderror(so, m, EINVAL); 6680 } 6681 6682 /* send the original message back to everyone */ 6683 mhp->msg->sadb_msg_errno = 0; 6684 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6685 } else { 6686 /* send packet as is */ 6687 6688 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6689 6690 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6691 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6692 } 6693} 6694 6695static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6696 const struct sadb_msghdr *)) = { 6697 NULL, /* SADB_RESERVED */ 6698 key_getspi, /* SADB_GETSPI */ 6699 key_update, /* SADB_UPDATE */ 6700 key_add, /* SADB_ADD */ 6701 key_delete, /* SADB_DELETE */ 6702 key_get, /* SADB_GET */ 6703 key_acquire2, /* SADB_ACQUIRE */ 6704 key_register, /* SADB_REGISTER */ 6705 NULL, /* SADB_EXPIRE */ 6706 key_flush, /* SADB_FLUSH */ 6707 key_dump, /* SADB_DUMP */ 6708 key_promisc, /* SADB_X_PROMISC */ 6709 NULL, /* SADB_X_PCHANGE */ 6710 key_spdadd, /* SADB_X_SPDUPDATE */ 6711 key_spdadd, /* SADB_X_SPDADD */ 6712 key_spddelete, /* SADB_X_SPDDELETE */ 6713 key_spdget, /* SADB_X_SPDGET */ 6714 NULL, /* SADB_X_SPDACQUIRE */ 6715 key_spddump, /* SADB_X_SPDDUMP */ 6716 key_spdflush, /* SADB_X_SPDFLUSH */ 6717 key_spdadd, /* SADB_X_SPDSETIDX */ 6718 NULL, /* SADB_X_SPDEXPIRE */ 6719 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6720}; 6721 6722/* 6723 * parse sadb_msg buffer to process PFKEYv2, 6724 * and create a data to response if needed. 6725 * I think to be dealed with mbuf directly. 6726 * IN: 6727 * msgp : pointer to pointer to a received buffer pulluped. 6728 * This is rewrited to response. 6729 * so : pointer to socket. 6730 * OUT: 6731 * length for buffer to send to user process. 6732 */ 6733int 6734key_parse(m, so) 6735 struct mbuf *m; 6736 struct socket *so; 6737{ 6738 INIT_VNET_IPSEC(curvnet); 6739 struct sadb_msg *msg; 6740 struct sadb_msghdr mh; 6741 u_int orglen; 6742 int error; 6743 int target; 6744 6745 IPSEC_ASSERT(so != NULL, ("null socket")); 6746 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6747 6748#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6749 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6750 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6751 kdebug_sadb(msg)); 6752#endif 6753 6754 if (m->m_len < sizeof(struct sadb_msg)) { 6755 m = m_pullup(m, sizeof(struct sadb_msg)); 6756 if (!m) 6757 return ENOBUFS; 6758 } 6759 msg = mtod(m, struct sadb_msg *); 6760 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6761 target = KEY_SENDUP_ONE; 6762 6763 if ((m->m_flags & M_PKTHDR) == 0 || 6764 m->m_pkthdr.len != m->m_pkthdr.len) { 6765 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6766 V_pfkeystat.out_invlen++; 6767 error = EINVAL; 6768 goto senderror; 6769 } 6770 6771 if (msg->sadb_msg_version != PF_KEY_V2) { 6772 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6773 __func__, msg->sadb_msg_version)); 6774 V_pfkeystat.out_invver++; 6775 error = EINVAL; 6776 goto senderror; 6777 } 6778 6779 if (msg->sadb_msg_type > SADB_MAX) { 6780 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6781 __func__, msg->sadb_msg_type)); 6782 V_pfkeystat.out_invmsgtype++; 6783 error = EINVAL; 6784 goto senderror; 6785 } 6786 6787 /* for old-fashioned code - should be nuked */ 6788 if (m->m_pkthdr.len > MCLBYTES) { 6789 m_freem(m); 6790 return ENOBUFS; 6791 } 6792 if (m->m_next) { 6793 struct mbuf *n; 6794 6795 MGETHDR(n, M_DONTWAIT, MT_DATA); 6796 if (n && m->m_pkthdr.len > MHLEN) { 6797 MCLGET(n, M_DONTWAIT); 6798 if ((n->m_flags & M_EXT) == 0) { 6799 m_free(n); 6800 n = NULL; 6801 } 6802 } 6803 if (!n) { 6804 m_freem(m); 6805 return ENOBUFS; 6806 } 6807 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6808 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6809 n->m_next = NULL; 6810 m_freem(m); 6811 m = n; 6812 } 6813 6814 /* align the mbuf chain so that extensions are in contiguous region. */ 6815 error = key_align(m, &mh); 6816 if (error) 6817 return error; 6818 6819 msg = mh.msg; 6820 6821 /* check SA type */ 6822 switch (msg->sadb_msg_satype) { 6823 case SADB_SATYPE_UNSPEC: 6824 switch (msg->sadb_msg_type) { 6825 case SADB_GETSPI: 6826 case SADB_UPDATE: 6827 case SADB_ADD: 6828 case SADB_DELETE: 6829 case SADB_GET: 6830 case SADB_ACQUIRE: 6831 case SADB_EXPIRE: 6832 ipseclog((LOG_DEBUG, "%s: must specify satype " 6833 "when msg type=%u.\n", __func__, 6834 msg->sadb_msg_type)); 6835 V_pfkeystat.out_invsatype++; 6836 error = EINVAL; 6837 goto senderror; 6838 } 6839 break; 6840 case SADB_SATYPE_AH: 6841 case SADB_SATYPE_ESP: 6842 case SADB_X_SATYPE_IPCOMP: 6843 case SADB_X_SATYPE_TCPSIGNATURE: 6844 switch (msg->sadb_msg_type) { 6845 case SADB_X_SPDADD: 6846 case SADB_X_SPDDELETE: 6847 case SADB_X_SPDGET: 6848 case SADB_X_SPDDUMP: 6849 case SADB_X_SPDFLUSH: 6850 case SADB_X_SPDSETIDX: 6851 case SADB_X_SPDUPDATE: 6852 case SADB_X_SPDDELETE2: 6853 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6854 __func__, msg->sadb_msg_type)); 6855 V_pfkeystat.out_invsatype++; 6856 error = EINVAL; 6857 goto senderror; 6858 } 6859 break; 6860 case SADB_SATYPE_RSVP: 6861 case SADB_SATYPE_OSPFV2: 6862 case SADB_SATYPE_RIPV2: 6863 case SADB_SATYPE_MIP: 6864 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6865 __func__, msg->sadb_msg_satype)); 6866 V_pfkeystat.out_invsatype++; 6867 error = EOPNOTSUPP; 6868 goto senderror; 6869 case 1: /* XXX: What does it do? */ 6870 if (msg->sadb_msg_type == SADB_X_PROMISC) 6871 break; 6872 /*FALLTHROUGH*/ 6873 default: 6874 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6875 __func__, msg->sadb_msg_satype)); 6876 V_pfkeystat.out_invsatype++; 6877 error = EINVAL; 6878 goto senderror; 6879 } 6880 6881 /* check field of upper layer protocol and address family */ 6882 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6883 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6884 struct sadb_address *src0, *dst0; 6885 u_int plen; 6886 6887 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6888 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6889 6890 /* check upper layer protocol */ 6891 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6892 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6893 "mismatched.\n", __func__)); 6894 V_pfkeystat.out_invaddr++; 6895 error = EINVAL; 6896 goto senderror; 6897 } 6898 6899 /* check family */ 6900 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6901 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6902 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6903 __func__)); 6904 V_pfkeystat.out_invaddr++; 6905 error = EINVAL; 6906 goto senderror; 6907 } 6908 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6909 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6910 ipseclog((LOG_DEBUG, "%s: address struct size " 6911 "mismatched.\n", __func__)); 6912 V_pfkeystat.out_invaddr++; 6913 error = EINVAL; 6914 goto senderror; 6915 } 6916 6917 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6918 case AF_INET: 6919 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6920 sizeof(struct sockaddr_in)) { 6921 V_pfkeystat.out_invaddr++; 6922 error = EINVAL; 6923 goto senderror; 6924 } 6925 break; 6926 case AF_INET6: 6927 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6928 sizeof(struct sockaddr_in6)) { 6929 V_pfkeystat.out_invaddr++; 6930 error = EINVAL; 6931 goto senderror; 6932 } 6933 break; 6934 default: 6935 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6936 __func__)); 6937 V_pfkeystat.out_invaddr++; 6938 error = EAFNOSUPPORT; 6939 goto senderror; 6940 } 6941 6942 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6943 case AF_INET: 6944 plen = sizeof(struct in_addr) << 3; 6945 break; 6946 case AF_INET6: 6947 plen = sizeof(struct in6_addr) << 3; 6948 break; 6949 default: 6950 plen = 0; /*fool gcc*/ 6951 break; 6952 } 6953 6954 /* check max prefix length */ 6955 if (src0->sadb_address_prefixlen > plen || 6956 dst0->sadb_address_prefixlen > plen) { 6957 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6958 __func__)); 6959 V_pfkeystat.out_invaddr++; 6960 error = EINVAL; 6961 goto senderror; 6962 } 6963 6964 /* 6965 * prefixlen == 0 is valid because there can be a case when 6966 * all addresses are matched. 6967 */ 6968 } 6969 6970 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6971 key_typesw[msg->sadb_msg_type] == NULL) { 6972 V_pfkeystat.out_invmsgtype++; 6973 error = EINVAL; 6974 goto senderror; 6975 } 6976 6977 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6978 6979senderror: 6980 msg->sadb_msg_errno = error; 6981 return key_sendup_mbuf(so, m, target); 6982} 6983 6984static int 6985key_senderror(so, m, code) 6986 struct socket *so; 6987 struct mbuf *m; 6988 int code; 6989{ 6990 struct sadb_msg *msg; 6991 6992 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6993 ("mbuf too small, len %u", m->m_len)); 6994 6995 msg = mtod(m, struct sadb_msg *); 6996 msg->sadb_msg_errno = code; 6997 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6998} 6999 7000/* 7001 * set the pointer to each header into message buffer. 7002 * m will be freed on error. 7003 * XXX larger-than-MCLBYTES extension? 7004 */ 7005static int 7006key_align(m, mhp) 7007 struct mbuf *m; 7008 struct sadb_msghdr *mhp; 7009{ 7010 INIT_VNET_IPSEC(curvnet); 7011 struct mbuf *n; 7012 struct sadb_ext *ext; 7013 size_t off, end; 7014 int extlen; 7015 int toff; 7016 7017 IPSEC_ASSERT(m != NULL, ("null mbuf")); 7018 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 7019 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7020 ("mbuf too small, len %u", m->m_len)); 7021 7022 /* initialize */ 7023 bzero(mhp, sizeof(*mhp)); 7024 7025 mhp->msg = mtod(m, struct sadb_msg *); 7026 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7027 7028 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7029 extlen = end; /*just in case extlen is not updated*/ 7030 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7031 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7032 if (!n) { 7033 /* m is already freed */ 7034 return ENOBUFS; 7035 } 7036 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7037 7038 /* set pointer */ 7039 switch (ext->sadb_ext_type) { 7040 case SADB_EXT_SA: 7041 case SADB_EXT_ADDRESS_SRC: 7042 case SADB_EXT_ADDRESS_DST: 7043 case SADB_EXT_ADDRESS_PROXY: 7044 case SADB_EXT_LIFETIME_CURRENT: 7045 case SADB_EXT_LIFETIME_HARD: 7046 case SADB_EXT_LIFETIME_SOFT: 7047 case SADB_EXT_KEY_AUTH: 7048 case SADB_EXT_KEY_ENCRYPT: 7049 case SADB_EXT_IDENTITY_SRC: 7050 case SADB_EXT_IDENTITY_DST: 7051 case SADB_EXT_SENSITIVITY: 7052 case SADB_EXT_PROPOSAL: 7053 case SADB_EXT_SUPPORTED_AUTH: 7054 case SADB_EXT_SUPPORTED_ENCRYPT: 7055 case SADB_EXT_SPIRANGE: 7056 case SADB_X_EXT_POLICY: 7057 case SADB_X_EXT_SA2: 7058 /* duplicate check */ 7059 /* 7060 * XXX Are there duplication payloads of either 7061 * KEY_AUTH or KEY_ENCRYPT ? 7062 */ 7063 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7064 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7065 "%u\n", __func__, ext->sadb_ext_type)); 7066 m_freem(m); 7067 V_pfkeystat.out_dupext++; 7068 return EINVAL; 7069 } 7070 break; 7071 default: 7072 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7073 __func__, ext->sadb_ext_type)); 7074 m_freem(m); 7075 V_pfkeystat.out_invexttype++; 7076 return EINVAL; 7077 } 7078 7079 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7080 7081 if (key_validate_ext(ext, extlen)) { 7082 m_freem(m); 7083 V_pfkeystat.out_invlen++; 7084 return EINVAL; 7085 } 7086 7087 n = m_pulldown(m, off, extlen, &toff); 7088 if (!n) { 7089 /* m is already freed */ 7090 return ENOBUFS; 7091 } 7092 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7093 7094 mhp->ext[ext->sadb_ext_type] = ext; 7095 mhp->extoff[ext->sadb_ext_type] = off; 7096 mhp->extlen[ext->sadb_ext_type] = extlen; 7097 } 7098 7099 if (off != end) { 7100 m_freem(m); 7101 V_pfkeystat.out_invlen++; 7102 return EINVAL; 7103 } 7104 7105 return 0; 7106} 7107 7108static int 7109key_validate_ext(ext, len) 7110 const struct sadb_ext *ext; 7111 int len; 7112{ 7113 const struct sockaddr *sa; 7114 enum { NONE, ADDR } checktype = NONE; 7115 int baselen = 0; 7116 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7117 7118 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7119 return EINVAL; 7120 7121 /* if it does not match minimum/maximum length, bail */ 7122 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7123 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7124 return EINVAL; 7125 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7126 return EINVAL; 7127 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7128 return EINVAL; 7129 7130 /* more checks based on sadb_ext_type XXX need more */ 7131 switch (ext->sadb_ext_type) { 7132 case SADB_EXT_ADDRESS_SRC: 7133 case SADB_EXT_ADDRESS_DST: 7134 case SADB_EXT_ADDRESS_PROXY: 7135 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7136 checktype = ADDR; 7137 break; 7138 case SADB_EXT_IDENTITY_SRC: 7139 case SADB_EXT_IDENTITY_DST: 7140 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7141 SADB_X_IDENTTYPE_ADDR) { 7142 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7143 checktype = ADDR; 7144 } else 7145 checktype = NONE; 7146 break; 7147 default: 7148 checktype = NONE; 7149 break; 7150 } 7151 7152 switch (checktype) { 7153 case NONE: 7154 break; 7155 case ADDR: 7156 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7157 if (len < baselen + sal) 7158 return EINVAL; 7159 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7160 return EINVAL; 7161 break; 7162 } 7163 7164 return 0; 7165} 7166 7167void 7168key_init(void) 7169{ 7170 INIT_VNET_IPSEC(curvnet); 7171 int i; 7172 7173 V_key_debug_level = 0; 7174 V_key_spi_trycnt = 1000; 7175 V_key_spi_minval = 0x100; 7176 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7177 V_policy_id = 0; 7178 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7179 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7180 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7181 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7182 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7183 7184 V_acq_seq = 0; 7185 7186 V_ipsec_esp_keymin = 256; 7187 V_ipsec_esp_auth = 0; 7188 V_ipsec_ah_keymin = 128; 7189 7190 for (i = 0; i < IPSEC_DIR_MAX; i++) 7191 LIST_INIT(&V_sptree[i]); 7192 7193 LIST_INIT(&V_sahtree); 7194 7195 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7196 LIST_INIT(&V_regtree[i]); 7197 7198 LIST_INIT(&V_acqtree); 7199 LIST_INIT(&V_spacqtree); 7200 7201 /* system default */ 7202 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7203 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7204 7205 if (!IS_DEFAULT_VNET(curvnet)) 7206 return; 7207 7208 SPTREE_LOCK_INIT(); 7209 REGTREE_LOCK_INIT(); 7210 SAHTREE_LOCK_INIT(); 7211 ACQ_LOCK_INIT(); 7212 SPACQ_LOCK_INIT(); 7213 7214#ifndef IPSEC_DEBUG2 7215 timeout((void *)key_timehandler, (void *)0, hz); 7216#endif /*IPSEC_DEBUG2*/ 7217 7218 /* initialize key statistics */ 7219 keystat.getspi_count = 1; 7220 7221 printf("IPsec: Initialized Security Association Processing.\n"); 7222 7223 return; 7224} 7225 7226/* 7227 * XXX: maybe This function is called after INBOUND IPsec processing. 7228 * 7229 * Special check for tunnel-mode packets. 7230 * We must make some checks for consistency between inner and outer IP header. 7231 * 7232 * xxx more checks to be provided 7233 */ 7234int 7235key_checktunnelsanity(sav, family, src, dst) 7236 struct secasvar *sav; 7237 u_int family; 7238 caddr_t src; 7239 caddr_t dst; 7240{ 7241 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7242 7243 /* XXX: check inner IP header */ 7244 7245 return 1; 7246} 7247 7248/* record data transfer on SA, and update timestamps */ 7249void 7250key_sa_recordxfer(sav, m) 7251 struct secasvar *sav; 7252 struct mbuf *m; 7253{ 7254 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7255 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7256 if (!sav->lft_c) 7257 return; 7258 7259 /* 7260 * XXX Currently, there is a difference of bytes size 7261 * between inbound and outbound processing. 7262 */ 7263 sav->lft_c->bytes += m->m_pkthdr.len; 7264 /* to check bytes lifetime is done in key_timehandler(). */ 7265 7266 /* 7267 * We use the number of packets as the unit of 7268 * allocations. We increment the variable 7269 * whenever {esp,ah}_{in,out}put is called. 7270 */ 7271 sav->lft_c->allocations++; 7272 /* XXX check for expires? */ 7273 7274 /* 7275 * NOTE: We record CURRENT usetime by using wall clock, 7276 * in seconds. HARD and SOFT lifetime are measured by the time 7277 * difference (again in seconds) from usetime. 7278 * 7279 * usetime 7280 * v expire expire 7281 * -----+-----+--------+---> t 7282 * <--------------> HARD 7283 * <-----> SOFT 7284 */ 7285 sav->lft_c->usetime = time_second; 7286 /* XXX check for expires? */ 7287 7288 return; 7289} 7290 7291/* dumb version */ 7292void 7293key_sa_routechange(dst) 7294 struct sockaddr *dst; 7295{ 7296 INIT_VNET_IPSEC(curvnet); 7297 struct secashead *sah; 7298 struct route *ro; 7299 7300 SAHTREE_LOCK(); 7301 LIST_FOREACH(sah, &V_sahtree, chain) { 7302 ro = &sah->sa_route; 7303 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7304 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7305 RTFREE(ro->ro_rt); 7306 ro->ro_rt = (struct rtentry *)NULL; 7307 } 7308 } 7309 SAHTREE_UNLOCK(); 7310} 7311 7312static void 7313key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7314{ 7315 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7316 SAHTREE_LOCK_ASSERT(); 7317 7318 if (sav->state != state) { 7319 if (__LIST_CHAINED(sav)) 7320 LIST_REMOVE(sav, chain); 7321 sav->state = state; 7322 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7323 } 7324} 7325 7326void 7327key_sa_stir_iv(sav) 7328 struct secasvar *sav; 7329{ 7330 7331 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7332 key_randomfill(sav->iv, sav->ivlen); 7333} 7334 7335/* XXX too much? */ 7336static struct mbuf * 7337key_alloc_mbuf(l) 7338 int l; 7339{ 7340 struct mbuf *m = NULL, *n; 7341 int len, t; 7342 7343 len = l; 7344 while (len > 0) { 7345 MGET(n, M_DONTWAIT, MT_DATA); 7346 if (n && len > MLEN) 7347 MCLGET(n, M_DONTWAIT); 7348 if (!n) { 7349 m_freem(m); 7350 return NULL; 7351 } 7352 7353 n->m_next = NULL; 7354 n->m_len = 0; 7355 n->m_len = M_TRAILINGSPACE(n); 7356 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7357 if (n->m_len > len) { 7358 t = (n->m_len - len) & ~(sizeof(long) - 1); 7359 n->m_data += t; 7360 n->m_len = len; 7361 } 7362 7363 len -= n->m_len; 7364 7365 if (m) 7366 m_cat(m, n); 7367 else 7368 m = n; 7369 } 7370 7371 return m; 7372} 7373 7374/* 7375 * Take one of the kernel's security keys and convert it into a PF_KEY 7376 * structure within an mbuf, suitable for sending up to a waiting 7377 * application in user land. 7378 * 7379 * IN: 7380 * src: A pointer to a kernel security key. 7381 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7382 * OUT: 7383 * a valid mbuf or NULL indicating an error 7384 * 7385 */ 7386 7387static struct mbuf * 7388key_setkey(struct seckey *src, u_int16_t exttype) 7389{ 7390 struct mbuf *m; 7391 struct sadb_key *p; 7392 int len; 7393 7394 if (src == NULL) 7395 return NULL; 7396 7397 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7398 m = key_alloc_mbuf(len); 7399 if (m == NULL) 7400 return NULL; 7401 p = mtod(m, struct sadb_key *); 7402 bzero(p, len); 7403 p->sadb_key_len = PFKEY_UNIT64(len); 7404 p->sadb_key_exttype = exttype; 7405 p->sadb_key_bits = src->bits; 7406 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7407 7408 return m; 7409} 7410 7411/* 7412 * Take one of the kernel's lifetime data structures and convert it 7413 * into a PF_KEY structure within an mbuf, suitable for sending up to 7414 * a waiting application in user land. 7415 * 7416 * IN: 7417 * src: A pointer to a kernel lifetime structure. 7418 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7419 * data structures for more information. 7420 * OUT: 7421 * a valid mbuf or NULL indicating an error 7422 * 7423 */ 7424 7425static struct mbuf * 7426key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7427{ 7428 struct mbuf *m = NULL; 7429 struct sadb_lifetime *p; 7430 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7431 7432 if (src == NULL) 7433 return NULL; 7434 7435 m = key_alloc_mbuf(len); 7436 if (m == NULL) 7437 return m; 7438 p = mtod(m, struct sadb_lifetime *); 7439 7440 bzero(p, len); 7441 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7442 p->sadb_lifetime_exttype = exttype; 7443 p->sadb_lifetime_allocations = src->allocations; 7444 p->sadb_lifetime_bytes = src->bytes; 7445 p->sadb_lifetime_addtime = src->addtime; 7446 p->sadb_lifetime_usetime = src->usetime; 7447 7448 return m; 7449 7450} 7451