key.c revision 189406
1/* $FreeBSD: head/sys/netipsec/key.c 189406 2009-03-05 16:22:32Z vanhu $ */ 2/* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 3 4/*- 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * This code is referd to RFC 2367 35 */ 36 37#include "opt_inet.h" 38#include "opt_inet6.h" 39#include "opt_ipsec.h" 40 41#include <sys/types.h> 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/kernel.h> 45#include <sys/lock.h> 46#include <sys/mutex.h> 47#include <sys/mbuf.h> 48#include <sys/domain.h> 49#include <sys/protosw.h> 50#include <sys/malloc.h> 51#include <sys/socket.h> 52#include <sys/socketvar.h> 53#include <sys/sysctl.h> 54#include <sys/errno.h> 55#include <sys/proc.h> 56#include <sys/queue.h> 57#include <sys/refcount.h> 58#include <sys/syslog.h> 59#include <sys/vimage.h> 60 61#include <net/if.h> 62#include <net/route.h> 63#include <net/raw_cb.h> 64 65#include <netinet/in.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#include <netinet/in_var.h> 69 70#ifdef INET6 71#include <netinet/ip6.h> 72#include <netinet6/in6_var.h> 73#include <netinet6/ip6_var.h> 74#endif /* INET6 */ 75 76#ifdef INET 77#include <netinet/in_pcb.h> 78#include <netinet/vinet.h> 79#endif 80#ifdef INET6 81#include <netinet6/in6_pcb.h> 82#include <netinet6/vinet6.h> 83#endif /* INET6 */ 84 85#include <net/pfkeyv2.h> 86#include <netipsec/keydb.h> 87#include <netipsec/key.h> 88#include <netipsec/keysock.h> 89#include <netipsec/key_debug.h> 90 91#include <netipsec/ipsec.h> 92#ifdef INET6 93#include <netipsec/ipsec6.h> 94#endif 95 96#include <netipsec/xform.h> 97 98#include <machine/stdarg.h> 99 100/* randomness */ 101#include <sys/random.h> 102#include <sys/vimage.h> 103 104#define FULLMASK 0xff 105#define _BITS(bytes) ((bytes) << 3) 106 107/* 108 * Note on SA reference counting: 109 * - SAs that are not in DEAD state will have (total external reference + 1) 110 * following value in reference count field. they cannot be freed and are 111 * referenced from SA header. 112 * - SAs that are in DEAD state will have (total external reference) 113 * in reference count field. they are ready to be freed. reference from 114 * SA header will be removed in key_delsav(), when the reference count 115 * field hits 0 (= no external reference other than from SA header. 116 */ 117 118#ifdef VIMAGE_GLOBALS 119u_int32_t key_debug_level; 120static u_int key_spi_trycnt; 121static u_int32_t key_spi_minval; 122static u_int32_t key_spi_maxval; 123static u_int32_t policy_id; 124static u_int key_int_random; 125static u_int key_larval_lifetime; 126static int key_blockacq_count; 127static int key_blockacq_lifetime; 128static int key_preferred_oldsa; 129 130static u_int32_t acq_seq; 131 132static int ipsec_esp_keymin; 133static int ipsec_esp_auth; 134static int ipsec_ah_keymin; 135 136static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 137static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 138static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 139static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 140static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 141#endif /* VIMAGE_GLOBALS */ 142 143static struct mtx sptree_lock; 144#define SPTREE_LOCK_INIT() \ 145 mtx_init(&sptree_lock, "sptree", \ 146 "fast ipsec security policy database", MTX_DEF) 147#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 148#define SPTREE_LOCK() mtx_lock(&sptree_lock) 149#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 150#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 151 152static struct mtx sahtree_lock; 153#define SAHTREE_LOCK_INIT() \ 154 mtx_init(&sahtree_lock, "sahtree", \ 155 "fast ipsec security association database", MTX_DEF) 156#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 157#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 158#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 159#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 160 161 /* registed list */ 162static struct mtx regtree_lock; 163#define REGTREE_LOCK_INIT() \ 164 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 165#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 166#define REGTREE_LOCK() mtx_lock(®tree_lock) 167#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 168#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 169 170static struct mtx acq_lock; 171#define ACQ_LOCK_INIT() \ 172 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 173#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 174#define ACQ_LOCK() mtx_lock(&acq_lock) 175#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 176#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 177 178static struct mtx spacq_lock; 179#define SPACQ_LOCK_INIT() \ 180 mtx_init(&spacq_lock, "spacqtree", \ 181 "fast ipsec security policy acquire list", MTX_DEF) 182#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 183#define SPACQ_LOCK() mtx_lock(&spacq_lock) 184#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 185#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 186 187/* search order for SAs */ 188static const u_int saorder_state_valid_prefer_old[] = { 189 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 190}; 191static const u_int saorder_state_valid_prefer_new[] = { 192 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 193}; 194static const u_int saorder_state_alive[] = { 195 /* except DEAD */ 196 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 197}; 198static const u_int saorder_state_any[] = { 199 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 200 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 201}; 202 203static const int minsize[] = { 204 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 205 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 206 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 207 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 208 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 209 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 210 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 211 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 212 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 213 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 214 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 215 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 216 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 217 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 218 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 219 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 220 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 221 0, /* SADB_X_EXT_KMPRIVATE */ 222 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 223 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 224}; 225static const int maxsize[] = { 226 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 227 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 228 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 229 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 230 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 231 0, /* SADB_EXT_ADDRESS_SRC */ 232 0, /* SADB_EXT_ADDRESS_DST */ 233 0, /* SADB_EXT_ADDRESS_PROXY */ 234 0, /* SADB_EXT_KEY_AUTH */ 235 0, /* SADB_EXT_KEY_ENCRYPT */ 236 0, /* SADB_EXT_IDENTITY_SRC */ 237 0, /* SADB_EXT_IDENTITY_DST */ 238 0, /* SADB_EXT_SENSITIVITY */ 239 0, /* SADB_EXT_PROPOSAL */ 240 0, /* SADB_EXT_SUPPORTED_AUTH */ 241 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 242 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 243 0, /* SADB_X_EXT_KMPRIVATE */ 244 0, /* SADB_X_EXT_POLICY */ 245 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 246}; 247 248#ifdef SYSCTL_DECL 249SYSCTL_DECL(_net_key); 250#endif 251 252SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_DEBUG_LEVEL, debug, 253 CTLFLAG_RW, key_debug_level, 0, ""); 254 255/* max count of trial for the decision of spi value */ 256SYSCTL_V_INT(V_NET, vnet_ipsec,_net_key, KEYCTL_SPI_TRY, spi_trycnt, 257 CTLFLAG_RW, key_spi_trycnt, 0, ""); 258 259/* minimum spi value to allocate automatically. */ 260SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MIN_VALUE, 261 spi_minval, CTLFLAG_RW, key_spi_minval, 0, ""); 262 263/* maximun spi value to allocate automatically. */ 264SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_SPI_MAX_VALUE, 265 spi_maxval, CTLFLAG_RW, key_spi_maxval, 0, ""); 266 267/* interval to initialize randseed */ 268SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_RANDOM_INT, 269 int_random, CTLFLAG_RW, key_int_random, 0, ""); 270 271/* lifetime for larval SA */ 272SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_LARVAL_LIFETIME, 273 larval_lifetime, CTLFLAG_RW, key_larval_lifetime, 0, ""); 274 275/* counter for blocking to send SADB_ACQUIRE to IKEd */ 276SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_COUNT, 277 blockacq_count, CTLFLAG_RW, key_blockacq_count, 0, ""); 278 279/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 280SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_BLOCKACQ_LIFETIME, 281 blockacq_lifetime, CTLFLAG_RW, key_blockacq_lifetime, 0, ""); 282 283/* ESP auth */ 284SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_AUTH, esp_auth, 285 CTLFLAG_RW, ipsec_esp_auth, 0, ""); 286 287/* minimum ESP key length */ 288SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_ESP_KEYMIN, 289 esp_keymin, CTLFLAG_RW, ipsec_esp_keymin, 0, ""); 290 291/* minimum AH key length */ 292SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_AH_KEYMIN, ah_keymin, 293 CTLFLAG_RW, ipsec_ah_keymin, 0, ""); 294 295/* perfered old SA rather than new SA */ 296SYSCTL_V_INT(V_NET, vnet_ipsec, _net_key, KEYCTL_PREFERED_OLDSA, 297 preferred_oldsa, CTLFLAG_RW, key_preferred_oldsa, 0, ""); 298 299#define __LIST_CHAINED(elm) \ 300 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 301#define LIST_INSERT_TAIL(head, elm, type, field) \ 302do {\ 303 struct type *curelm = LIST_FIRST(head); \ 304 if (curelm == NULL) {\ 305 LIST_INSERT_HEAD(head, elm, field); \ 306 } else { \ 307 while (LIST_NEXT(curelm, field)) \ 308 curelm = LIST_NEXT(curelm, field);\ 309 LIST_INSERT_AFTER(curelm, elm, field);\ 310 }\ 311} while (0) 312 313#define KEY_CHKSASTATE(head, sav, name) \ 314do { \ 315 if ((head) != (sav)) { \ 316 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 317 (name), (head), (sav))); \ 318 continue; \ 319 } \ 320} while (0) 321 322#define KEY_CHKSPDIR(head, sp, name) \ 323do { \ 324 if ((head) != (sp)) { \ 325 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 326 "anyway continue.\n", \ 327 (name), (head), (sp))); \ 328 } \ 329} while (0) 330 331MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 332MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 333MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 334MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 335MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 336MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 337MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 338 339/* 340 * set parameters into secpolicyindex buffer. 341 * Must allocate secpolicyindex buffer passed to this function. 342 */ 343#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 344do { \ 345 bzero((idx), sizeof(struct secpolicyindex)); \ 346 (idx)->dir = (_dir); \ 347 (idx)->prefs = (ps); \ 348 (idx)->prefd = (pd); \ 349 (idx)->ul_proto = (ulp); \ 350 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 351 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 352} while (0) 353 354/* 355 * set parameters into secasindex buffer. 356 * Must allocate secasindex buffer before calling this function. 357 */ 358#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 359do { \ 360 bzero((idx), sizeof(struct secasindex)); \ 361 (idx)->proto = (p); \ 362 (idx)->mode = (m); \ 363 (idx)->reqid = (r); \ 364 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 365 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 366} while (0) 367 368/* key statistics */ 369struct _keystat { 370 u_long getspi_count; /* the avarage of count to try to get new SPI */ 371} keystat; 372 373struct sadb_msghdr { 374 struct sadb_msg *msg; 375 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 376 int extoff[SADB_EXT_MAX + 1]; 377 int extlen[SADB_EXT_MAX + 1]; 378}; 379 380static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 381static void key_freesp_so __P((struct secpolicy **)); 382static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 383static void key_delsp __P((struct secpolicy *)); 384static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 385static void _key_delsp(struct secpolicy *sp); 386static struct secpolicy *key_getspbyid __P((u_int32_t)); 387static u_int32_t key_newreqid __P((void)); 388static struct mbuf *key_gather_mbuf __P((struct mbuf *, 389 const struct sadb_msghdr *, int, int, ...)); 390static int key_spdadd __P((struct socket *, struct mbuf *, 391 const struct sadb_msghdr *)); 392static u_int32_t key_getnewspid __P((void)); 393static int key_spddelete __P((struct socket *, struct mbuf *, 394 const struct sadb_msghdr *)); 395static int key_spddelete2 __P((struct socket *, struct mbuf *, 396 const struct sadb_msghdr *)); 397static int key_spdget __P((struct socket *, struct mbuf *, 398 const struct sadb_msghdr *)); 399static int key_spdflush __P((struct socket *, struct mbuf *, 400 const struct sadb_msghdr *)); 401static int key_spddump __P((struct socket *, struct mbuf *, 402 const struct sadb_msghdr *)); 403static struct mbuf *key_setdumpsp __P((struct secpolicy *, 404 u_int8_t, u_int32_t, u_int32_t)); 405static u_int key_getspreqmsglen __P((struct secpolicy *)); 406static int key_spdexpire __P((struct secpolicy *)); 407static struct secashead *key_newsah __P((struct secasindex *)); 408static void key_delsah __P((struct secashead *)); 409static struct secasvar *key_newsav __P((struct mbuf *, 410 const struct sadb_msghdr *, struct secashead *, int *, 411 const char*, int)); 412#define KEY_NEWSAV(m, sadb, sah, e) \ 413 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 414static void key_delsav __P((struct secasvar *)); 415static struct secashead *key_getsah __P((struct secasindex *)); 416static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 417static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 418static int key_setsaval __P((struct secasvar *, struct mbuf *, 419 const struct sadb_msghdr *)); 420static int key_mature __P((struct secasvar *)); 421static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 422 u_int8_t, u_int32_t, u_int32_t)); 423static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 424 u_int32_t, pid_t, u_int16_t)); 425static struct mbuf *key_setsadbsa __P((struct secasvar *)); 426static struct mbuf *key_setsadbaddr __P((u_int16_t, 427 const struct sockaddr *, u_int8_t, u_int16_t)); 428static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 429static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 430 u_int32_t)); 431static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 432 struct malloc_type *); 433static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 434 struct malloc_type *type); 435#ifdef INET6 436static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 437#endif 438 439/* flags for key_cmpsaidx() */ 440#define CMP_HEAD 1 /* protocol, addresses. */ 441#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 442#define CMP_REQID 3 /* additionally HEAD, reaid. */ 443#define CMP_EXACTLY 4 /* all elements. */ 444static int key_cmpsaidx 445 __P((const struct secasindex *, const struct secasindex *, int)); 446 447static int key_cmpspidx_exactly 448 __P((struct secpolicyindex *, struct secpolicyindex *)); 449static int key_cmpspidx_withmask 450 __P((struct secpolicyindex *, struct secpolicyindex *)); 451static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 452static int key_bbcmp __P((const void *, const void *, u_int)); 453static u_int16_t key_satype2proto __P((u_int8_t)); 454static u_int8_t key_proto2satype __P((u_int16_t)); 455 456static int key_getspi __P((struct socket *, struct mbuf *, 457 const struct sadb_msghdr *)); 458static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 459 struct secasindex *)); 460static int key_update __P((struct socket *, struct mbuf *, 461 const struct sadb_msghdr *)); 462#ifdef IPSEC_DOSEQCHECK 463static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 464#endif 465static int key_add __P((struct socket *, struct mbuf *, 466 const struct sadb_msghdr *)); 467static int key_setident __P((struct secashead *, struct mbuf *, 468 const struct sadb_msghdr *)); 469static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 470 const struct sadb_msghdr *)); 471static int key_delete __P((struct socket *, struct mbuf *, 472 const struct sadb_msghdr *)); 473static int key_get __P((struct socket *, struct mbuf *, 474 const struct sadb_msghdr *)); 475 476static void key_getcomb_setlifetime __P((struct sadb_comb *)); 477static struct mbuf *key_getcomb_esp __P((void)); 478static struct mbuf *key_getcomb_ah __P((void)); 479static struct mbuf *key_getcomb_ipcomp __P((void)); 480static struct mbuf *key_getprop __P((const struct secasindex *)); 481 482static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 483static struct secacq *key_newacq __P((const struct secasindex *)); 484static struct secacq *key_getacq __P((const struct secasindex *)); 485static struct secacq *key_getacqbyseq __P((u_int32_t)); 486static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 487static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 488static int key_acquire2 __P((struct socket *, struct mbuf *, 489 const struct sadb_msghdr *)); 490static int key_register __P((struct socket *, struct mbuf *, 491 const struct sadb_msghdr *)); 492static int key_expire __P((struct secasvar *)); 493static int key_flush __P((struct socket *, struct mbuf *, 494 const struct sadb_msghdr *)); 495static int key_dump __P((struct socket *, struct mbuf *, 496 const struct sadb_msghdr *)); 497static int key_promisc __P((struct socket *, struct mbuf *, 498 const struct sadb_msghdr *)); 499static int key_senderror __P((struct socket *, struct mbuf *, int)); 500static int key_validate_ext __P((const struct sadb_ext *, int)); 501static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 502static struct mbuf *key_setlifetime(struct seclifetime *src, 503 u_int16_t exttype); 504static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 505 506#if 0 507static const char *key_getfqdn __P((void)); 508static const char *key_getuserfqdn __P((void)); 509#endif 510static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 511static struct mbuf *key_alloc_mbuf __P((int)); 512 513static __inline void 514sa_initref(struct secasvar *sav) 515{ 516 517 refcount_init(&sav->refcnt, 1); 518} 519static __inline void 520sa_addref(struct secasvar *sav) 521{ 522 523 refcount_acquire(&sav->refcnt); 524 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 525} 526static __inline int 527sa_delref(struct secasvar *sav) 528{ 529 530 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 531 return (refcount_release(&sav->refcnt)); 532} 533 534#define SP_ADDREF(p) do { \ 535 (p)->refcnt++; \ 536 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 537} while (0) 538#define SP_DELREF(p) do { \ 539 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 540 (p)->refcnt--; \ 541} while (0) 542 543 544/* 545 * Update the refcnt while holding the SPTREE lock. 546 */ 547void 548key_addref(struct secpolicy *sp) 549{ 550 SPTREE_LOCK(); 551 SP_ADDREF(sp); 552 SPTREE_UNLOCK(); 553} 554 555/* 556 * Return 0 when there are known to be no SP's for the specified 557 * direction. Otherwise return 1. This is used by IPsec code 558 * to optimize performance. 559 */ 560int 561key_havesp(u_int dir) 562{ 563 INIT_VNET_IPSEC(curvnet); 564 565 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 566 LIST_FIRST(&V_sptree[dir]) != NULL : 1); 567} 568 569/* %%% IPsec policy management */ 570/* 571 * allocating a SP for OUTBOUND or INBOUND packet. 572 * Must call key_freesp() later. 573 * OUT: NULL: not found 574 * others: found and return the pointer. 575 */ 576struct secpolicy * 577key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 578{ 579 INIT_VNET_IPSEC(curvnet); 580 struct secpolicy *sp; 581 582 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 583 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 584 ("invalid direction %u", dir)); 585 586 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 587 printf("DP %s from %s:%u\n", __func__, where, tag)); 588 589 /* get a SP entry */ 590 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 591 printf("*** objects\n"); 592 kdebug_secpolicyindex(spidx)); 593 594 SPTREE_LOCK(); 595 LIST_FOREACH(sp, &V_sptree[dir], chain) { 596 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 597 printf("*** in SPD\n"); 598 kdebug_secpolicyindex(&sp->spidx)); 599 600 if (sp->state == IPSEC_SPSTATE_DEAD) 601 continue; 602 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 603 goto found; 604 } 605 sp = NULL; 606found: 607 if (sp) { 608 /* sanity check */ 609 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 610 611 /* found a SPD entry */ 612 sp->lastused = time_second; 613 SP_ADDREF(sp); 614 } 615 SPTREE_UNLOCK(); 616 617 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 618 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 619 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 620 return sp; 621} 622 623/* 624 * allocating a SP for OUTBOUND or INBOUND packet. 625 * Must call key_freesp() later. 626 * OUT: NULL: not found 627 * others: found and return the pointer. 628 */ 629struct secpolicy * 630key_allocsp2(u_int32_t spi, 631 union sockaddr_union *dst, 632 u_int8_t proto, 633 u_int dir, 634 const char* where, int tag) 635{ 636 INIT_VNET_IPSEC(curvnet); 637 struct secpolicy *sp; 638 639 IPSEC_ASSERT(dst != NULL, ("null dst")); 640 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 641 ("invalid direction %u", dir)); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 644 printf("DP %s from %s:%u\n", __func__, where, tag)); 645 646 /* get a SP entry */ 647 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 648 printf("*** objects\n"); 649 printf("spi %u proto %u dir %u\n", spi, proto, dir); 650 kdebug_sockaddr(&dst->sa)); 651 652 SPTREE_LOCK(); 653 LIST_FOREACH(sp, &V_sptree[dir], chain) { 654 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 655 printf("*** in SPD\n"); 656 kdebug_secpolicyindex(&sp->spidx)); 657 658 if (sp->state == IPSEC_SPSTATE_DEAD) 659 continue; 660 /* compare simple values, then dst address */ 661 if (sp->spidx.ul_proto != proto) 662 continue; 663 /* NB: spi's must exist and match */ 664 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 665 continue; 666 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 667 goto found; 668 } 669 sp = NULL; 670found: 671 if (sp) { 672 /* sanity check */ 673 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 674 675 /* found a SPD entry */ 676 sp->lastused = time_second; 677 SP_ADDREF(sp); 678 } 679 SPTREE_UNLOCK(); 680 681 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 682 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 683 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 684 return sp; 685} 686 687/* 688 * return a policy that matches this particular inbound packet. 689 * XXX slow 690 */ 691struct secpolicy * 692key_gettunnel(const struct sockaddr *osrc, 693 const struct sockaddr *odst, 694 const struct sockaddr *isrc, 695 const struct sockaddr *idst, 696 const char* where, int tag) 697{ 698 INIT_VNET_IPSEC(curvnet); 699 struct secpolicy *sp; 700 const int dir = IPSEC_DIR_INBOUND; 701 struct ipsecrequest *r1, *r2, *p; 702 struct secpolicyindex spidx; 703 704 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 705 printf("DP %s from %s:%u\n", __func__, where, tag)); 706 707 if (isrc->sa_family != idst->sa_family) { 708 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 709 __func__, isrc->sa_family, idst->sa_family)); 710 sp = NULL; 711 goto done; 712 } 713 714 SPTREE_LOCK(); 715 LIST_FOREACH(sp, &V_sptree[dir], chain) { 716 if (sp->state == IPSEC_SPSTATE_DEAD) 717 continue; 718 719 r1 = r2 = NULL; 720 for (p = sp->req; p; p = p->next) { 721 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 722 continue; 723 724 r1 = r2; 725 r2 = p; 726 727 if (!r1) { 728 /* here we look at address matches only */ 729 spidx = sp->spidx; 730 if (isrc->sa_len > sizeof(spidx.src) || 731 idst->sa_len > sizeof(spidx.dst)) 732 continue; 733 bcopy(isrc, &spidx.src, isrc->sa_len); 734 bcopy(idst, &spidx.dst, idst->sa_len); 735 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 736 continue; 737 } else { 738 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 739 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 740 continue; 741 } 742 743 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 744 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 745 continue; 746 747 goto found; 748 } 749 } 750 sp = NULL; 751found: 752 if (sp) { 753 sp->lastused = time_second; 754 SP_ADDREF(sp); 755 } 756 SPTREE_UNLOCK(); 757done: 758 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 759 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 760 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 761 return sp; 762} 763 764/* 765 * allocating an SA entry for an *OUTBOUND* packet. 766 * checking each request entries in SP, and acquire an SA if need. 767 * OUT: 0: there are valid requests. 768 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 769 */ 770int 771key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 772{ 773 INIT_VNET_IPSEC(curvnet); 774 u_int level; 775 int error; 776 777 IPSEC_ASSERT(isr != NULL, ("null isr")); 778 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 779 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 780 saidx->mode == IPSEC_MODE_TUNNEL, 781 ("unexpected policy %u", saidx->mode)); 782 783 /* 784 * XXX guard against protocol callbacks from the crypto 785 * thread as they reference ipsecrequest.sav which we 786 * temporarily null out below. Need to rethink how we 787 * handle bundled SA's in the callback thread. 788 */ 789 IPSECREQUEST_LOCK_ASSERT(isr); 790 791 /* get current level */ 792 level = ipsec_get_reqlevel(isr); 793#if 0 794 /* 795 * We do allocate new SA only if the state of SA in the holder is 796 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 797 */ 798 if (isr->sav != NULL) { 799 if (isr->sav->sah == NULL) 800 panic("%s: sah is null.\n", __func__); 801 if (isr->sav == (struct secasvar *)LIST_FIRST( 802 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 803 KEY_FREESAV(&isr->sav); 804 isr->sav = NULL; 805 } 806 } 807#else 808 /* 809 * we free any SA stashed in the IPsec request because a different 810 * SA may be involved each time this request is checked, either 811 * because new SAs are being configured, or this request is 812 * associated with an unconnected datagram socket, or this request 813 * is associated with a system default policy. 814 * 815 * The operation may have negative impact to performance. We may 816 * want to check cached SA carefully, rather than picking new SA 817 * every time. 818 */ 819 if (isr->sav != NULL) { 820 KEY_FREESAV(&isr->sav); 821 isr->sav = NULL; 822 } 823#endif 824 825 /* 826 * new SA allocation if no SA found. 827 * key_allocsa_policy should allocate the oldest SA available. 828 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 829 */ 830 if (isr->sav == NULL) 831 isr->sav = key_allocsa_policy(saidx); 832 833 /* When there is SA. */ 834 if (isr->sav != NULL) { 835 if (isr->sav->state != SADB_SASTATE_MATURE && 836 isr->sav->state != SADB_SASTATE_DYING) 837 return EINVAL; 838 return 0; 839 } 840 841 /* there is no SA */ 842 error = key_acquire(saidx, isr->sp); 843 if (error != 0) { 844 /* XXX What should I do ? */ 845 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 846 __func__, error)); 847 return error; 848 } 849 850 if (level != IPSEC_LEVEL_REQUIRE) { 851 /* XXX sigh, the interface to this routine is botched */ 852 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 853 return 0; 854 } else { 855 return ENOENT; 856 } 857} 858 859/* 860 * allocating a SA for policy entry from SAD. 861 * NOTE: searching SAD of aliving state. 862 * OUT: NULL: not found. 863 * others: found and return the pointer. 864 */ 865static struct secasvar * 866key_allocsa_policy(const struct secasindex *saidx) 867{ 868#define N(a) _ARRAYLEN(a) 869 INIT_VNET_IPSEC(curvnet); 870 struct secashead *sah; 871 struct secasvar *sav; 872 u_int stateidx, arraysize; 873 const u_int *state_valid; 874 875 SAHTREE_LOCK(); 876 LIST_FOREACH(sah, &V_sahtree, chain) { 877 if (sah->state == SADB_SASTATE_DEAD) 878 continue; 879 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 880 if (V_key_preferred_oldsa) { 881 state_valid = saorder_state_valid_prefer_old; 882 arraysize = N(saorder_state_valid_prefer_old); 883 } else { 884 state_valid = saorder_state_valid_prefer_new; 885 arraysize = N(saorder_state_valid_prefer_new); 886 } 887 SAHTREE_UNLOCK(); 888 goto found; 889 } 890 } 891 SAHTREE_UNLOCK(); 892 893 return NULL; 894 895 found: 896 /* search valid state */ 897 for (stateidx = 0; stateidx < arraysize; stateidx++) { 898 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 899 if (sav != NULL) 900 return sav; 901 } 902 903 return NULL; 904#undef N 905} 906 907/* 908 * searching SAD with direction, protocol, mode and state. 909 * called by key_allocsa_policy(). 910 * OUT: 911 * NULL : not found 912 * others : found, pointer to a SA. 913 */ 914static struct secasvar * 915key_do_allocsa_policy(struct secashead *sah, u_int state) 916{ 917 INIT_VNET_IPSEC(curvnet); 918 struct secasvar *sav, *nextsav, *candidate, *d; 919 920 /* initilize */ 921 candidate = NULL; 922 923 SAHTREE_LOCK(); 924 for (sav = LIST_FIRST(&sah->savtree[state]); 925 sav != NULL; 926 sav = nextsav) { 927 928 nextsav = LIST_NEXT(sav, chain); 929 930 /* sanity check */ 931 KEY_CHKSASTATE(sav->state, state, __func__); 932 933 /* initialize */ 934 if (candidate == NULL) { 935 candidate = sav; 936 continue; 937 } 938 939 /* Which SA is the better ? */ 940 941 IPSEC_ASSERT(candidate->lft_c != NULL, 942 ("null candidate lifetime")); 943 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 944 945 /* What the best method is to compare ? */ 946 if (V_key_preferred_oldsa) { 947 if (candidate->lft_c->addtime > 948 sav->lft_c->addtime) { 949 candidate = sav; 950 } 951 continue; 952 /*NOTREACHED*/ 953 } 954 955 /* preferred new sa rather than old sa */ 956 if (candidate->lft_c->addtime < 957 sav->lft_c->addtime) { 958 d = candidate; 959 candidate = sav; 960 } else 961 d = sav; 962 963 /* 964 * prepared to delete the SA when there is more 965 * suitable candidate and the lifetime of the SA is not 966 * permanent. 967 */ 968 if (d->lft_h->addtime != 0) { 969 struct mbuf *m, *result; 970 u_int8_t satype; 971 972 key_sa_chgstate(d, SADB_SASTATE_DEAD); 973 974 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 975 976 satype = key_proto2satype(d->sah->saidx.proto); 977 if (satype == 0) 978 goto msgfail; 979 980 m = key_setsadbmsg(SADB_DELETE, 0, 981 satype, 0, 0, d->refcnt - 1); 982 if (!m) 983 goto msgfail; 984 result = m; 985 986 /* set sadb_address for saidx's. */ 987 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 988 &d->sah->saidx.src.sa, 989 d->sah->saidx.src.sa.sa_len << 3, 990 IPSEC_ULPROTO_ANY); 991 if (!m) 992 goto msgfail; 993 m_cat(result, m); 994 995 /* set sadb_address for saidx's. */ 996 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 997 &d->sah->saidx.dst.sa, 998 d->sah->saidx.dst.sa.sa_len << 3, 999 IPSEC_ULPROTO_ANY); 1000 if (!m) 1001 goto msgfail; 1002 m_cat(result, m); 1003 1004 /* create SA extension */ 1005 m = key_setsadbsa(d); 1006 if (!m) 1007 goto msgfail; 1008 m_cat(result, m); 1009 1010 if (result->m_len < sizeof(struct sadb_msg)) { 1011 result = m_pullup(result, 1012 sizeof(struct sadb_msg)); 1013 if (result == NULL) 1014 goto msgfail; 1015 } 1016 1017 result->m_pkthdr.len = 0; 1018 for (m = result; m; m = m->m_next) 1019 result->m_pkthdr.len += m->m_len; 1020 mtod(result, struct sadb_msg *)->sadb_msg_len = 1021 PFKEY_UNIT64(result->m_pkthdr.len); 1022 1023 if (key_sendup_mbuf(NULL, result, 1024 KEY_SENDUP_REGISTERED)) 1025 goto msgfail; 1026 msgfail: 1027 KEY_FREESAV(&d); 1028 } 1029 } 1030 if (candidate) { 1031 sa_addref(candidate); 1032 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1033 printf("DP %s cause refcnt++:%d SA:%p\n", 1034 __func__, candidate->refcnt, candidate)); 1035 } 1036 SAHTREE_UNLOCK(); 1037 1038 return candidate; 1039} 1040 1041/* 1042 * allocating a usable SA entry for a *INBOUND* packet. 1043 * Must call key_freesav() later. 1044 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1045 * NULL: not found, or error occured. 1046 * 1047 * In the comparison, no source address is used--for RFC2401 conformance. 1048 * To quote, from section 4.1: 1049 * A security association is uniquely identified by a triple consisting 1050 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1051 * security protocol (AH or ESP) identifier. 1052 * Note that, however, we do need to keep source address in IPsec SA. 1053 * IKE specification and PF_KEY specification do assume that we 1054 * keep source address in IPsec SA. We see a tricky situation here. 1055 */ 1056struct secasvar * 1057key_allocsa( 1058 union sockaddr_union *dst, 1059 u_int proto, 1060 u_int32_t spi, 1061 const char* where, int tag) 1062{ 1063 INIT_VNET_IPSEC(curvnet); 1064 struct secashead *sah; 1065 struct secasvar *sav; 1066 u_int stateidx, arraysize, state; 1067 const u_int *saorder_state_valid; 1068 1069 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1070 1071 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1072 printf("DP %s from %s:%u\n", __func__, where, tag)); 1073 1074 /* 1075 * searching SAD. 1076 * XXX: to be checked internal IP header somewhere. Also when 1077 * IPsec tunnel packet is received. But ESP tunnel mode is 1078 * encrypted so we can't check internal IP header. 1079 */ 1080 SAHTREE_LOCK(); 1081 if (V_key_preferred_oldsa) { 1082 saorder_state_valid = saorder_state_valid_prefer_old; 1083 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1084 } else { 1085 saorder_state_valid = saorder_state_valid_prefer_new; 1086 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1087 } 1088 LIST_FOREACH(sah, &V_sahtree, chain) { 1089 /* search valid state */ 1090 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1091 state = saorder_state_valid[stateidx]; 1092 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1093 /* sanity check */ 1094 KEY_CHKSASTATE(sav->state, state, __func__); 1095 /* do not return entries w/ unusable state */ 1096 if (sav->state != SADB_SASTATE_MATURE && 1097 sav->state != SADB_SASTATE_DYING) 1098 continue; 1099 if (proto != sav->sah->saidx.proto) 1100 continue; 1101 if (spi != sav->spi) 1102 continue; 1103#if 0 /* don't check src */ 1104 /* check src address */ 1105 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1106 continue; 1107#endif 1108 /* check dst address */ 1109 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1110 continue; 1111 sa_addref(sav); 1112 goto done; 1113 } 1114 } 1115 } 1116 sav = NULL; 1117done: 1118 SAHTREE_UNLOCK(); 1119 1120 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1121 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1122 sav, sav ? sav->refcnt : 0)); 1123 return sav; 1124} 1125 1126/* 1127 * Must be called after calling key_allocsp(). 1128 * For both the packet without socket and key_freeso(). 1129 */ 1130void 1131_key_freesp(struct secpolicy **spp, const char* where, int tag) 1132{ 1133 INIT_VNET_IPSEC(curvnet); 1134 struct secpolicy *sp = *spp; 1135 1136 IPSEC_ASSERT(sp != NULL, ("null sp")); 1137 1138 SPTREE_LOCK(); 1139 SP_DELREF(sp); 1140 1141 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1142 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1143 __func__, sp, sp->id, where, tag, sp->refcnt)); 1144 1145 if (sp->refcnt == 0) { 1146 *spp = NULL; 1147 key_delsp(sp); 1148 } 1149 SPTREE_UNLOCK(); 1150} 1151 1152/* 1153 * Must be called after calling key_allocsp(). 1154 * For the packet with socket. 1155 */ 1156void 1157key_freeso(struct socket *so) 1158{ 1159 INIT_VNET_IPSEC(curvnet); 1160 IPSEC_ASSERT(so != NULL, ("null so")); 1161 1162 switch (so->so_proto->pr_domain->dom_family) { 1163#if defined(INET) || defined(INET6) 1164#ifdef INET 1165 case PF_INET: 1166#endif 1167#ifdef INET6 1168 case PF_INET6: 1169#endif 1170 { 1171 struct inpcb *pcb = sotoinpcb(so); 1172 1173 /* Does it have a PCB ? */ 1174 if (pcb == NULL) 1175 return; 1176 key_freesp_so(&pcb->inp_sp->sp_in); 1177 key_freesp_so(&pcb->inp_sp->sp_out); 1178 } 1179 break; 1180#endif /* INET || INET6 */ 1181 default: 1182 ipseclog((LOG_DEBUG, "%s: unknown address family=%d.\n", 1183 __func__, so->so_proto->pr_domain->dom_family)); 1184 return; 1185 } 1186} 1187 1188static void 1189key_freesp_so(struct secpolicy **sp) 1190{ 1191 IPSEC_ASSERT(sp != NULL && *sp != NULL, ("null sp")); 1192 1193 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1194 (*sp)->policy == IPSEC_POLICY_BYPASS) 1195 return; 1196 1197 IPSEC_ASSERT((*sp)->policy == IPSEC_POLICY_IPSEC, 1198 ("invalid policy %u", (*sp)->policy)); 1199 KEY_FREESP(sp); 1200} 1201 1202/* 1203 * Must be called after calling key_allocsa(). 1204 * This function is called by key_freesp() to free some SA allocated 1205 * for a policy. 1206 */ 1207void 1208key_freesav(struct secasvar **psav, const char* where, int tag) 1209{ 1210 INIT_VNET_IPSEC(curvnet); 1211 struct secasvar *sav = *psav; 1212 1213 IPSEC_ASSERT(sav != NULL, ("null sav")); 1214 1215 if (sa_delref(sav)) { 1216 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1217 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1218 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1219 *psav = NULL; 1220 key_delsav(sav); 1221 } else { 1222 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1223 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1224 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1225 } 1226} 1227 1228/* %%% SPD management */ 1229/* 1230 * free security policy entry. 1231 */ 1232static void 1233key_delsp(struct secpolicy *sp) 1234{ 1235 struct ipsecrequest *isr, *nextisr; 1236 1237 IPSEC_ASSERT(sp != NULL, ("null sp")); 1238 SPTREE_LOCK_ASSERT(); 1239 1240 sp->state = IPSEC_SPSTATE_DEAD; 1241 1242 IPSEC_ASSERT(sp->refcnt == 0, 1243 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1244 1245 /* remove from SP index */ 1246 if (__LIST_CHAINED(sp)) 1247 LIST_REMOVE(sp, chain); 1248 1249 for (isr = sp->req; isr != NULL; isr = nextisr) { 1250 if (isr->sav != NULL) { 1251 KEY_FREESAV(&isr->sav); 1252 isr->sav = NULL; 1253 } 1254 1255 nextisr = isr->next; 1256 ipsec_delisr(isr); 1257 } 1258 _key_delsp(sp); 1259} 1260 1261/* 1262 * search SPD 1263 * OUT: NULL : not found 1264 * others : found, pointer to a SP. 1265 */ 1266static struct secpolicy * 1267key_getsp(struct secpolicyindex *spidx) 1268{ 1269 INIT_VNET_IPSEC(curvnet); 1270 struct secpolicy *sp; 1271 1272 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1273 1274 SPTREE_LOCK(); 1275 LIST_FOREACH(sp, &V_sptree[spidx->dir], chain) { 1276 if (sp->state == IPSEC_SPSTATE_DEAD) 1277 continue; 1278 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1279 SP_ADDREF(sp); 1280 break; 1281 } 1282 } 1283 SPTREE_UNLOCK(); 1284 1285 return sp; 1286} 1287 1288/* 1289 * get SP by index. 1290 * OUT: NULL : not found 1291 * others : found, pointer to a SP. 1292 */ 1293static struct secpolicy * 1294key_getspbyid(u_int32_t id) 1295{ 1296 INIT_VNET_IPSEC(curvnet); 1297 struct secpolicy *sp; 1298 1299 SPTREE_LOCK(); 1300 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_INBOUND], chain) { 1301 if (sp->state == IPSEC_SPSTATE_DEAD) 1302 continue; 1303 if (sp->id == id) { 1304 SP_ADDREF(sp); 1305 goto done; 1306 } 1307 } 1308 1309 LIST_FOREACH(sp, &V_sptree[IPSEC_DIR_OUTBOUND], chain) { 1310 if (sp->state == IPSEC_SPSTATE_DEAD) 1311 continue; 1312 if (sp->id == id) { 1313 SP_ADDREF(sp); 1314 goto done; 1315 } 1316 } 1317done: 1318 SPTREE_UNLOCK(); 1319 1320 return sp; 1321} 1322 1323struct secpolicy * 1324key_newsp(const char* where, int tag) 1325{ 1326 INIT_VNET_IPSEC(curvnet); 1327 struct secpolicy *newsp = NULL; 1328 1329 newsp = (struct secpolicy *) 1330 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1331 if (newsp) { 1332 SECPOLICY_LOCK_INIT(newsp); 1333 newsp->refcnt = 1; 1334 newsp->req = NULL; 1335 } 1336 1337 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1338 printf("DP %s from %s:%u return SP:%p\n", __func__, 1339 where, tag, newsp)); 1340 return newsp; 1341} 1342 1343static void 1344_key_delsp(struct secpolicy *sp) 1345{ 1346 SECPOLICY_LOCK_DESTROY(sp); 1347 free(sp, M_IPSEC_SP); 1348} 1349 1350/* 1351 * create secpolicy structure from sadb_x_policy structure. 1352 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1353 * so must be set properly later. 1354 */ 1355struct secpolicy * 1356key_msg2sp(xpl0, len, error) 1357 struct sadb_x_policy *xpl0; 1358 size_t len; 1359 int *error; 1360{ 1361 INIT_VNET_IPSEC(curvnet); 1362 struct secpolicy *newsp; 1363 1364 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1365 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1366 1367 if (len != PFKEY_EXTLEN(xpl0)) { 1368 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1369 *error = EINVAL; 1370 return NULL; 1371 } 1372 1373 if ((newsp = KEY_NEWSP()) == NULL) { 1374 *error = ENOBUFS; 1375 return NULL; 1376 } 1377 1378 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1379 newsp->policy = xpl0->sadb_x_policy_type; 1380 1381 /* check policy */ 1382 switch (xpl0->sadb_x_policy_type) { 1383 case IPSEC_POLICY_DISCARD: 1384 case IPSEC_POLICY_NONE: 1385 case IPSEC_POLICY_ENTRUST: 1386 case IPSEC_POLICY_BYPASS: 1387 newsp->req = NULL; 1388 break; 1389 1390 case IPSEC_POLICY_IPSEC: 1391 { 1392 int tlen; 1393 struct sadb_x_ipsecrequest *xisr; 1394 struct ipsecrequest **p_isr = &newsp->req; 1395 1396 /* validity check */ 1397 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1398 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1399 __func__)); 1400 KEY_FREESP(&newsp); 1401 *error = EINVAL; 1402 return NULL; 1403 } 1404 1405 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1406 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1407 1408 while (tlen > 0) { 1409 /* length check */ 1410 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1411 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1412 "length.\n", __func__)); 1413 KEY_FREESP(&newsp); 1414 *error = EINVAL; 1415 return NULL; 1416 } 1417 1418 /* allocate request buffer */ 1419 /* NB: data structure is zero'd */ 1420 *p_isr = ipsec_newisr(); 1421 if ((*p_isr) == NULL) { 1422 ipseclog((LOG_DEBUG, 1423 "%s: No more memory.\n", __func__)); 1424 KEY_FREESP(&newsp); 1425 *error = ENOBUFS; 1426 return NULL; 1427 } 1428 1429 /* set values */ 1430 switch (xisr->sadb_x_ipsecrequest_proto) { 1431 case IPPROTO_ESP: 1432 case IPPROTO_AH: 1433 case IPPROTO_IPCOMP: 1434 break; 1435 default: 1436 ipseclog((LOG_DEBUG, 1437 "%s: invalid proto type=%u\n", __func__, 1438 xisr->sadb_x_ipsecrequest_proto)); 1439 KEY_FREESP(&newsp); 1440 *error = EPROTONOSUPPORT; 1441 return NULL; 1442 } 1443 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1444 1445 switch (xisr->sadb_x_ipsecrequest_mode) { 1446 case IPSEC_MODE_TRANSPORT: 1447 case IPSEC_MODE_TUNNEL: 1448 break; 1449 case IPSEC_MODE_ANY: 1450 default: 1451 ipseclog((LOG_DEBUG, 1452 "%s: invalid mode=%u\n", __func__, 1453 xisr->sadb_x_ipsecrequest_mode)); 1454 KEY_FREESP(&newsp); 1455 *error = EINVAL; 1456 return NULL; 1457 } 1458 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1459 1460 switch (xisr->sadb_x_ipsecrequest_level) { 1461 case IPSEC_LEVEL_DEFAULT: 1462 case IPSEC_LEVEL_USE: 1463 case IPSEC_LEVEL_REQUIRE: 1464 break; 1465 case IPSEC_LEVEL_UNIQUE: 1466 /* validity check */ 1467 /* 1468 * If range violation of reqid, kernel will 1469 * update it, don't refuse it. 1470 */ 1471 if (xisr->sadb_x_ipsecrequest_reqid 1472 > IPSEC_MANUAL_REQID_MAX) { 1473 ipseclog((LOG_DEBUG, 1474 "%s: reqid=%d range " 1475 "violation, updated by kernel.\n", 1476 __func__, 1477 xisr->sadb_x_ipsecrequest_reqid)); 1478 xisr->sadb_x_ipsecrequest_reqid = 0; 1479 } 1480 1481 /* allocate new reqid id if reqid is zero. */ 1482 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1483 u_int32_t reqid; 1484 if ((reqid = key_newreqid()) == 0) { 1485 KEY_FREESP(&newsp); 1486 *error = ENOBUFS; 1487 return NULL; 1488 } 1489 (*p_isr)->saidx.reqid = reqid; 1490 xisr->sadb_x_ipsecrequest_reqid = reqid; 1491 } else { 1492 /* set it for manual keying. */ 1493 (*p_isr)->saidx.reqid = 1494 xisr->sadb_x_ipsecrequest_reqid; 1495 } 1496 break; 1497 1498 default: 1499 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1500 __func__, 1501 xisr->sadb_x_ipsecrequest_level)); 1502 KEY_FREESP(&newsp); 1503 *error = EINVAL; 1504 return NULL; 1505 } 1506 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1507 1508 /* set IP addresses if there */ 1509 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1510 struct sockaddr *paddr; 1511 1512 paddr = (struct sockaddr *)(xisr + 1); 1513 1514 /* validity check */ 1515 if (paddr->sa_len 1516 > sizeof((*p_isr)->saidx.src)) { 1517 ipseclog((LOG_DEBUG, "%s: invalid " 1518 "request address length.\n", 1519 __func__)); 1520 KEY_FREESP(&newsp); 1521 *error = EINVAL; 1522 return NULL; 1523 } 1524 bcopy(paddr, &(*p_isr)->saidx.src, 1525 paddr->sa_len); 1526 1527 paddr = (struct sockaddr *)((caddr_t)paddr 1528 + paddr->sa_len); 1529 1530 /* validity check */ 1531 if (paddr->sa_len 1532 > sizeof((*p_isr)->saidx.dst)) { 1533 ipseclog((LOG_DEBUG, "%s: invalid " 1534 "request address length.\n", 1535 __func__)); 1536 KEY_FREESP(&newsp); 1537 *error = EINVAL; 1538 return NULL; 1539 } 1540 bcopy(paddr, &(*p_isr)->saidx.dst, 1541 paddr->sa_len); 1542 } 1543 1544 (*p_isr)->sp = newsp; 1545 1546 /* initialization for the next. */ 1547 p_isr = &(*p_isr)->next; 1548 tlen -= xisr->sadb_x_ipsecrequest_len; 1549 1550 /* validity check */ 1551 if (tlen < 0) { 1552 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1553 __func__)); 1554 KEY_FREESP(&newsp); 1555 *error = EINVAL; 1556 return NULL; 1557 } 1558 1559 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1560 + xisr->sadb_x_ipsecrequest_len); 1561 } 1562 } 1563 break; 1564 default: 1565 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1566 KEY_FREESP(&newsp); 1567 *error = EINVAL; 1568 return NULL; 1569 } 1570 1571 *error = 0; 1572 return newsp; 1573} 1574 1575static u_int32_t 1576key_newreqid() 1577{ 1578 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1579 1580 auto_reqid = (auto_reqid == ~0 1581 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1582 1583 /* XXX should be unique check */ 1584 1585 return auto_reqid; 1586} 1587 1588/* 1589 * copy secpolicy struct to sadb_x_policy structure indicated. 1590 */ 1591struct mbuf * 1592key_sp2msg(sp) 1593 struct secpolicy *sp; 1594{ 1595 struct sadb_x_policy *xpl; 1596 int tlen; 1597 caddr_t p; 1598 struct mbuf *m; 1599 1600 IPSEC_ASSERT(sp != NULL, ("null policy")); 1601 1602 tlen = key_getspreqmsglen(sp); 1603 1604 m = key_alloc_mbuf(tlen); 1605 if (!m || m->m_next) { /*XXX*/ 1606 if (m) 1607 m_freem(m); 1608 return NULL; 1609 } 1610 1611 m->m_len = tlen; 1612 m->m_next = NULL; 1613 xpl = mtod(m, struct sadb_x_policy *); 1614 bzero(xpl, tlen); 1615 1616 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1617 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1618 xpl->sadb_x_policy_type = sp->policy; 1619 xpl->sadb_x_policy_dir = sp->spidx.dir; 1620 xpl->sadb_x_policy_id = sp->id; 1621 p = (caddr_t)xpl + sizeof(*xpl); 1622 1623 /* if is the policy for ipsec ? */ 1624 if (sp->policy == IPSEC_POLICY_IPSEC) { 1625 struct sadb_x_ipsecrequest *xisr; 1626 struct ipsecrequest *isr; 1627 1628 for (isr = sp->req; isr != NULL; isr = isr->next) { 1629 1630 xisr = (struct sadb_x_ipsecrequest *)p; 1631 1632 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1633 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1634 xisr->sadb_x_ipsecrequest_level = isr->level; 1635 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1636 1637 p += sizeof(*xisr); 1638 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1639 p += isr->saidx.src.sa.sa_len; 1640 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1641 p += isr->saidx.src.sa.sa_len; 1642 1643 xisr->sadb_x_ipsecrequest_len = 1644 PFKEY_ALIGN8(sizeof(*xisr) 1645 + isr->saidx.src.sa.sa_len 1646 + isr->saidx.dst.sa.sa_len); 1647 } 1648 } 1649 1650 return m; 1651} 1652 1653/* m will not be freed nor modified */ 1654static struct mbuf * 1655#ifdef __STDC__ 1656key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1657 int ndeep, int nitem, ...) 1658#else 1659key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1660 struct mbuf *m; 1661 const struct sadb_msghdr *mhp; 1662 int ndeep; 1663 int nitem; 1664 va_dcl 1665#endif 1666{ 1667 va_list ap; 1668 int idx; 1669 int i; 1670 struct mbuf *result = NULL, *n; 1671 int len; 1672 1673 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1674 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1675 1676 va_start(ap, nitem); 1677 for (i = 0; i < nitem; i++) { 1678 idx = va_arg(ap, int); 1679 if (idx < 0 || idx > SADB_EXT_MAX) 1680 goto fail; 1681 /* don't attempt to pull empty extension */ 1682 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1683 continue; 1684 if (idx != SADB_EXT_RESERVED && 1685 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1686 continue; 1687 1688 if (idx == SADB_EXT_RESERVED) { 1689 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1690 1691 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1692 1693 MGETHDR(n, M_DONTWAIT, MT_DATA); 1694 if (!n) 1695 goto fail; 1696 n->m_len = len; 1697 n->m_next = NULL; 1698 m_copydata(m, 0, sizeof(struct sadb_msg), 1699 mtod(n, caddr_t)); 1700 } else if (i < ndeep) { 1701 len = mhp->extlen[idx]; 1702 n = key_alloc_mbuf(len); 1703 if (!n || n->m_next) { /*XXX*/ 1704 if (n) 1705 m_freem(n); 1706 goto fail; 1707 } 1708 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1709 mtod(n, caddr_t)); 1710 } else { 1711 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1712 M_DONTWAIT); 1713 } 1714 if (n == NULL) 1715 goto fail; 1716 1717 if (result) 1718 m_cat(result, n); 1719 else 1720 result = n; 1721 } 1722 va_end(ap); 1723 1724 if ((result->m_flags & M_PKTHDR) != 0) { 1725 result->m_pkthdr.len = 0; 1726 for (n = result; n; n = n->m_next) 1727 result->m_pkthdr.len += n->m_len; 1728 } 1729 1730 return result; 1731 1732fail: 1733 m_freem(result); 1734 return NULL; 1735} 1736 1737/* 1738 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1739 * add an entry to SP database, when received 1740 * <base, address(SD), (lifetime(H),) policy> 1741 * from the user(?). 1742 * Adding to SP database, 1743 * and send 1744 * <base, address(SD), (lifetime(H),) policy> 1745 * to the socket which was send. 1746 * 1747 * SPDADD set a unique policy entry. 1748 * SPDSETIDX like SPDADD without a part of policy requests. 1749 * SPDUPDATE replace a unique policy entry. 1750 * 1751 * m will always be freed. 1752 */ 1753static int 1754key_spdadd(so, m, mhp) 1755 struct socket *so; 1756 struct mbuf *m; 1757 const struct sadb_msghdr *mhp; 1758{ 1759 INIT_VNET_IPSEC(curvnet); 1760 struct sadb_address *src0, *dst0; 1761 struct sadb_x_policy *xpl0, *xpl; 1762 struct sadb_lifetime *lft = NULL; 1763 struct secpolicyindex spidx; 1764 struct secpolicy *newsp; 1765 int error; 1766 1767 IPSEC_ASSERT(so != NULL, ("null socket")); 1768 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1769 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1770 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1771 1772 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1773 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1774 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1775 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1776 return key_senderror(so, m, EINVAL); 1777 } 1778 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1779 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1780 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1781 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1782 __func__)); 1783 return key_senderror(so, m, EINVAL); 1784 } 1785 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1786 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1787 < sizeof(struct sadb_lifetime)) { 1788 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1789 __func__)); 1790 return key_senderror(so, m, EINVAL); 1791 } 1792 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1793 } 1794 1795 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1796 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1797 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1798 1799 /* make secindex */ 1800 /* XXX boundary check against sa_len */ 1801 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1802 src0 + 1, 1803 dst0 + 1, 1804 src0->sadb_address_prefixlen, 1805 dst0->sadb_address_prefixlen, 1806 src0->sadb_address_proto, 1807 &spidx); 1808 1809 /* checking the direciton. */ 1810 switch (xpl0->sadb_x_policy_dir) { 1811 case IPSEC_DIR_INBOUND: 1812 case IPSEC_DIR_OUTBOUND: 1813 break; 1814 default: 1815 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1816 mhp->msg->sadb_msg_errno = EINVAL; 1817 return 0; 1818 } 1819 1820 /* check policy */ 1821 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1822 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1823 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1824 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1825 return key_senderror(so, m, EINVAL); 1826 } 1827 1828 /* policy requests are mandatory when action is ipsec. */ 1829 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1830 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1831 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1832 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1833 __func__)); 1834 return key_senderror(so, m, EINVAL); 1835 } 1836 1837 /* 1838 * checking there is SP already or not. 1839 * SPDUPDATE doesn't depend on whether there is a SP or not. 1840 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1841 * then error. 1842 */ 1843 newsp = key_getsp(&spidx); 1844 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1845 if (newsp) { 1846 newsp->state = IPSEC_SPSTATE_DEAD; 1847 KEY_FREESP(&newsp); 1848 } 1849 } else { 1850 if (newsp != NULL) { 1851 KEY_FREESP(&newsp); 1852 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1853 __func__)); 1854 return key_senderror(so, m, EEXIST); 1855 } 1856 } 1857 1858 /* allocation new SP entry */ 1859 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1860 return key_senderror(so, m, error); 1861 } 1862 1863 if ((newsp->id = key_getnewspid()) == 0) { 1864 _key_delsp(newsp); 1865 return key_senderror(so, m, ENOBUFS); 1866 } 1867 1868 /* XXX boundary check against sa_len */ 1869 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1870 src0 + 1, 1871 dst0 + 1, 1872 src0->sadb_address_prefixlen, 1873 dst0->sadb_address_prefixlen, 1874 src0->sadb_address_proto, 1875 &newsp->spidx); 1876 1877 /* sanity check on addr pair */ 1878 if (((struct sockaddr *)(src0 + 1))->sa_family != 1879 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1880 _key_delsp(newsp); 1881 return key_senderror(so, m, EINVAL); 1882 } 1883 if (((struct sockaddr *)(src0 + 1))->sa_len != 1884 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1885 _key_delsp(newsp); 1886 return key_senderror(so, m, EINVAL); 1887 } 1888#if 1 1889 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1890 struct sockaddr *sa; 1891 sa = (struct sockaddr *)(src0 + 1); 1892 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1893 _key_delsp(newsp); 1894 return key_senderror(so, m, EINVAL); 1895 } 1896 } 1897 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1898 struct sockaddr *sa; 1899 sa = (struct sockaddr *)(dst0 + 1); 1900 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1901 _key_delsp(newsp); 1902 return key_senderror(so, m, EINVAL); 1903 } 1904 } 1905#endif 1906 1907 newsp->created = time_second; 1908 newsp->lastused = newsp->created; 1909 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1910 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1911 1912 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1913 newsp->state = IPSEC_SPSTATE_ALIVE; 1914 LIST_INSERT_TAIL(&V_sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1915 1916 /* delete the entry in spacqtree */ 1917 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1918 struct secspacq *spacq = key_getspacq(&spidx); 1919 if (spacq != NULL) { 1920 /* reset counter in order to deletion by timehandler. */ 1921 spacq->created = time_second; 1922 spacq->count = 0; 1923 SPACQ_UNLOCK(); 1924 } 1925 } 1926 1927 { 1928 struct mbuf *n, *mpolicy; 1929 struct sadb_msg *newmsg; 1930 int off; 1931 1932 /* create new sadb_msg to reply. */ 1933 if (lft) { 1934 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1935 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1936 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1937 } else { 1938 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1939 SADB_X_EXT_POLICY, 1940 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1941 } 1942 if (!n) 1943 return key_senderror(so, m, ENOBUFS); 1944 1945 if (n->m_len < sizeof(*newmsg)) { 1946 n = m_pullup(n, sizeof(*newmsg)); 1947 if (!n) 1948 return key_senderror(so, m, ENOBUFS); 1949 } 1950 newmsg = mtod(n, struct sadb_msg *); 1951 newmsg->sadb_msg_errno = 0; 1952 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1953 1954 off = 0; 1955 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1956 sizeof(*xpl), &off); 1957 if (mpolicy == NULL) { 1958 /* n is already freed */ 1959 return key_senderror(so, m, ENOBUFS); 1960 } 1961 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1962 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1963 m_freem(n); 1964 return key_senderror(so, m, EINVAL); 1965 } 1966 xpl->sadb_x_policy_id = newsp->id; 1967 1968 m_freem(m); 1969 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1970 } 1971} 1972 1973/* 1974 * get new policy id. 1975 * OUT: 1976 * 0: failure. 1977 * others: success. 1978 */ 1979static u_int32_t 1980key_getnewspid() 1981{ 1982 INIT_VNET_IPSEC(curvnet); 1983 u_int32_t newid = 0; 1984 int count = V_key_spi_trycnt; /* XXX */ 1985 struct secpolicy *sp; 1986 1987 /* when requesting to allocate spi ranged */ 1988 while (count--) { 1989 newid = (V_policy_id = (V_policy_id == ~0 ? 1 : V_policy_id + 1)); 1990 1991 if ((sp = key_getspbyid(newid)) == NULL) 1992 break; 1993 1994 KEY_FREESP(&sp); 1995 } 1996 1997 if (count == 0 || newid == 0) { 1998 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 1999 __func__)); 2000 return 0; 2001 } 2002 2003 return newid; 2004} 2005 2006/* 2007 * SADB_SPDDELETE processing 2008 * receive 2009 * <base, address(SD), policy(*)> 2010 * from the user(?), and set SADB_SASTATE_DEAD, 2011 * and send, 2012 * <base, address(SD), policy(*)> 2013 * to the ikmpd. 2014 * policy(*) including direction of policy. 2015 * 2016 * m will always be freed. 2017 */ 2018static int 2019key_spddelete(so, m, mhp) 2020 struct socket *so; 2021 struct mbuf *m; 2022 const struct sadb_msghdr *mhp; 2023{ 2024 INIT_VNET_IPSEC(curvnet); 2025 struct sadb_address *src0, *dst0; 2026 struct sadb_x_policy *xpl0; 2027 struct secpolicyindex spidx; 2028 struct secpolicy *sp; 2029 2030 IPSEC_ASSERT(so != NULL, ("null so")); 2031 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2032 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2033 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2034 2035 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2036 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2037 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2038 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2039 __func__)); 2040 return key_senderror(so, m, EINVAL); 2041 } 2042 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2043 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2044 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2045 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2046 __func__)); 2047 return key_senderror(so, m, EINVAL); 2048 } 2049 2050 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2051 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2052 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2053 2054 /* make secindex */ 2055 /* XXX boundary check against sa_len */ 2056 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2057 src0 + 1, 2058 dst0 + 1, 2059 src0->sadb_address_prefixlen, 2060 dst0->sadb_address_prefixlen, 2061 src0->sadb_address_proto, 2062 &spidx); 2063 2064 /* checking the direciton. */ 2065 switch (xpl0->sadb_x_policy_dir) { 2066 case IPSEC_DIR_INBOUND: 2067 case IPSEC_DIR_OUTBOUND: 2068 break; 2069 default: 2070 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2071 return key_senderror(so, m, EINVAL); 2072 } 2073 2074 /* Is there SP in SPD ? */ 2075 if ((sp = key_getsp(&spidx)) == NULL) { 2076 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2077 return key_senderror(so, m, EINVAL); 2078 } 2079 2080 /* save policy id to buffer to be returned. */ 2081 xpl0->sadb_x_policy_id = sp->id; 2082 2083 sp->state = IPSEC_SPSTATE_DEAD; 2084 KEY_FREESP(&sp); 2085 2086 { 2087 struct mbuf *n; 2088 struct sadb_msg *newmsg; 2089 2090 /* create new sadb_msg to reply. */ 2091 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2092 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2093 if (!n) 2094 return key_senderror(so, m, ENOBUFS); 2095 2096 newmsg = mtod(n, struct sadb_msg *); 2097 newmsg->sadb_msg_errno = 0; 2098 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2099 2100 m_freem(m); 2101 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2102 } 2103} 2104 2105/* 2106 * SADB_SPDDELETE2 processing 2107 * receive 2108 * <base, policy(*)> 2109 * from the user(?), and set SADB_SASTATE_DEAD, 2110 * and send, 2111 * <base, policy(*)> 2112 * to the ikmpd. 2113 * policy(*) including direction of policy. 2114 * 2115 * m will always be freed. 2116 */ 2117static int 2118key_spddelete2(so, m, mhp) 2119 struct socket *so; 2120 struct mbuf *m; 2121 const struct sadb_msghdr *mhp; 2122{ 2123 INIT_VNET_IPSEC(curvnet); 2124 u_int32_t id; 2125 struct secpolicy *sp; 2126 2127 IPSEC_ASSERT(so != NULL, ("null socket")); 2128 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2129 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2130 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2131 2132 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2133 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2134 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2135 return key_senderror(so, m, EINVAL); 2136 } 2137 2138 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2139 2140 /* Is there SP in SPD ? */ 2141 if ((sp = key_getspbyid(id)) == NULL) { 2142 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2143 return key_senderror(so, m, EINVAL); 2144 } 2145 2146 sp->state = IPSEC_SPSTATE_DEAD; 2147 KEY_FREESP(&sp); 2148 2149 { 2150 struct mbuf *n, *nn; 2151 struct sadb_msg *newmsg; 2152 int off, len; 2153 2154 /* create new sadb_msg to reply. */ 2155 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2156 2157 MGETHDR(n, M_DONTWAIT, MT_DATA); 2158 if (n && len > MHLEN) { 2159 MCLGET(n, M_DONTWAIT); 2160 if ((n->m_flags & M_EXT) == 0) { 2161 m_freem(n); 2162 n = NULL; 2163 } 2164 } 2165 if (!n) 2166 return key_senderror(so, m, ENOBUFS); 2167 2168 n->m_len = len; 2169 n->m_next = NULL; 2170 off = 0; 2171 2172 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2173 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2174 2175 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2176 off, len)); 2177 2178 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2179 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2180 if (!n->m_next) { 2181 m_freem(n); 2182 return key_senderror(so, m, ENOBUFS); 2183 } 2184 2185 n->m_pkthdr.len = 0; 2186 for (nn = n; nn; nn = nn->m_next) 2187 n->m_pkthdr.len += nn->m_len; 2188 2189 newmsg = mtod(n, struct sadb_msg *); 2190 newmsg->sadb_msg_errno = 0; 2191 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2192 2193 m_freem(m); 2194 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2195 } 2196} 2197 2198/* 2199 * SADB_X_GET processing 2200 * receive 2201 * <base, policy(*)> 2202 * from the user(?), 2203 * and send, 2204 * <base, address(SD), policy> 2205 * to the ikmpd. 2206 * policy(*) including direction of policy. 2207 * 2208 * m will always be freed. 2209 */ 2210static int 2211key_spdget(so, m, mhp) 2212 struct socket *so; 2213 struct mbuf *m; 2214 const struct sadb_msghdr *mhp; 2215{ 2216 INIT_VNET_IPSEC(curvnet); 2217 u_int32_t id; 2218 struct secpolicy *sp; 2219 struct mbuf *n; 2220 2221 IPSEC_ASSERT(so != NULL, ("null socket")); 2222 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2223 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2224 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2225 2226 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2227 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2228 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2229 __func__)); 2230 return key_senderror(so, m, EINVAL); 2231 } 2232 2233 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2234 2235 /* Is there SP in SPD ? */ 2236 if ((sp = key_getspbyid(id)) == NULL) { 2237 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2238 return key_senderror(so, m, ENOENT); 2239 } 2240 2241 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2242 if (n != NULL) { 2243 m_freem(m); 2244 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2245 } else 2246 return key_senderror(so, m, ENOBUFS); 2247} 2248 2249/* 2250 * SADB_X_SPDACQUIRE processing. 2251 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2252 * send 2253 * <base, policy(*)> 2254 * to KMD, and expect to receive 2255 * <base> with SADB_X_SPDACQUIRE if error occured, 2256 * or 2257 * <base, policy> 2258 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2259 * policy(*) is without policy requests. 2260 * 2261 * 0 : succeed 2262 * others: error number 2263 */ 2264int 2265key_spdacquire(sp) 2266 struct secpolicy *sp; 2267{ 2268 INIT_VNET_IPSEC(curvnet); 2269 struct mbuf *result = NULL, *m; 2270 struct secspacq *newspacq; 2271 2272 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2273 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2274 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2275 ("policy not IPSEC %u", sp->policy)); 2276 2277 /* Get an entry to check whether sent message or not. */ 2278 newspacq = key_getspacq(&sp->spidx); 2279 if (newspacq != NULL) { 2280 if (V_key_blockacq_count < newspacq->count) { 2281 /* reset counter and do send message. */ 2282 newspacq->count = 0; 2283 } else { 2284 /* increment counter and do nothing. */ 2285 newspacq->count++; 2286 return 0; 2287 } 2288 SPACQ_UNLOCK(); 2289 } else { 2290 /* make new entry for blocking to send SADB_ACQUIRE. */ 2291 newspacq = key_newspacq(&sp->spidx); 2292 if (newspacq == NULL) 2293 return ENOBUFS; 2294 } 2295 2296 /* create new sadb_msg to reply. */ 2297 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2298 if (!m) 2299 return ENOBUFS; 2300 2301 result = m; 2302 2303 result->m_pkthdr.len = 0; 2304 for (m = result; m; m = m->m_next) 2305 result->m_pkthdr.len += m->m_len; 2306 2307 mtod(result, struct sadb_msg *)->sadb_msg_len = 2308 PFKEY_UNIT64(result->m_pkthdr.len); 2309 2310 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2311} 2312 2313/* 2314 * SADB_SPDFLUSH processing 2315 * receive 2316 * <base> 2317 * from the user, and free all entries in secpctree. 2318 * and send, 2319 * <base> 2320 * to the user. 2321 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2322 * 2323 * m will always be freed. 2324 */ 2325static int 2326key_spdflush(so, m, mhp) 2327 struct socket *so; 2328 struct mbuf *m; 2329 const struct sadb_msghdr *mhp; 2330{ 2331 INIT_VNET_IPSEC(curvnet); 2332 struct sadb_msg *newmsg; 2333 struct secpolicy *sp; 2334 u_int dir; 2335 2336 IPSEC_ASSERT(so != NULL, ("null socket")); 2337 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2338 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2339 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2340 2341 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2342 return key_senderror(so, m, EINVAL); 2343 2344 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2345 SPTREE_LOCK(); 2346 LIST_FOREACH(sp, &V_sptree[dir], chain) 2347 sp->state = IPSEC_SPSTATE_DEAD; 2348 SPTREE_UNLOCK(); 2349 } 2350 2351 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2352 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2353 return key_senderror(so, m, ENOBUFS); 2354 } 2355 2356 if (m->m_next) 2357 m_freem(m->m_next); 2358 m->m_next = NULL; 2359 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2360 newmsg = mtod(m, struct sadb_msg *); 2361 newmsg->sadb_msg_errno = 0; 2362 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2363 2364 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2365} 2366 2367/* 2368 * SADB_SPDDUMP processing 2369 * receive 2370 * <base> 2371 * from the user, and dump all SP leaves 2372 * and send, 2373 * <base> ..... 2374 * to the ikmpd. 2375 * 2376 * m will always be freed. 2377 */ 2378static int 2379key_spddump(so, m, mhp) 2380 struct socket *so; 2381 struct mbuf *m; 2382 const struct sadb_msghdr *mhp; 2383{ 2384 INIT_VNET_IPSEC(curvnet); 2385 struct secpolicy *sp; 2386 int cnt; 2387 u_int dir; 2388 struct mbuf *n; 2389 2390 IPSEC_ASSERT(so != NULL, ("null socket")); 2391 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2392 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2393 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2394 2395 /* search SPD entry and get buffer size. */ 2396 cnt = 0; 2397 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2398 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2399 cnt++; 2400 } 2401 } 2402 2403 if (cnt == 0) 2404 return key_senderror(so, m, ENOENT); 2405 2406 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2407 LIST_FOREACH(sp, &V_sptree[dir], chain) { 2408 --cnt; 2409 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2410 mhp->msg->sadb_msg_pid); 2411 2412 if (n) 2413 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2414 } 2415 } 2416 2417 m_freem(m); 2418 return 0; 2419} 2420 2421static struct mbuf * 2422key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, u_int32_t pid) 2423{ 2424 struct mbuf *result = NULL, *m; 2425 struct seclifetime lt; 2426 2427 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2428 if (!m) 2429 goto fail; 2430 result = m; 2431 2432 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2433 &sp->spidx.src.sa, sp->spidx.prefs, 2434 sp->spidx.ul_proto); 2435 if (!m) 2436 goto fail; 2437 m_cat(result, m); 2438 2439 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2440 &sp->spidx.dst.sa, sp->spidx.prefd, 2441 sp->spidx.ul_proto); 2442 if (!m) 2443 goto fail; 2444 m_cat(result, m); 2445 2446 m = key_sp2msg(sp); 2447 if (!m) 2448 goto fail; 2449 m_cat(result, m); 2450 2451 if(sp->lifetime){ 2452 lt.addtime=sp->created; 2453 lt.usetime= sp->lastused; 2454 m = key_setlifetime(<, SADB_EXT_LIFETIME_CURRENT); 2455 if (!m) 2456 goto fail; 2457 m_cat(result, m); 2458 2459 lt.addtime=sp->lifetime; 2460 lt.usetime= sp->validtime; 2461 m = key_setlifetime(<, SADB_EXT_LIFETIME_HARD); 2462 if (!m) 2463 goto fail; 2464 m_cat(result, m); 2465 } 2466 2467 if ((result->m_flags & M_PKTHDR) == 0) 2468 goto fail; 2469 2470 if (result->m_len < sizeof(struct sadb_msg)) { 2471 result = m_pullup(result, sizeof(struct sadb_msg)); 2472 if (result == NULL) 2473 goto fail; 2474 } 2475 2476 result->m_pkthdr.len = 0; 2477 for (m = result; m; m = m->m_next) 2478 result->m_pkthdr.len += m->m_len; 2479 2480 mtod(result, struct sadb_msg *)->sadb_msg_len = 2481 PFKEY_UNIT64(result->m_pkthdr.len); 2482 2483 return result; 2484 2485fail: 2486 m_freem(result); 2487 return NULL; 2488} 2489 2490/* 2491 * get PFKEY message length for security policy and request. 2492 */ 2493static u_int 2494key_getspreqmsglen(sp) 2495 struct secpolicy *sp; 2496{ 2497 u_int tlen; 2498 2499 tlen = sizeof(struct sadb_x_policy); 2500 2501 /* if is the policy for ipsec ? */ 2502 if (sp->policy != IPSEC_POLICY_IPSEC) 2503 return tlen; 2504 2505 /* get length of ipsec requests */ 2506 { 2507 struct ipsecrequest *isr; 2508 int len; 2509 2510 for (isr = sp->req; isr != NULL; isr = isr->next) { 2511 len = sizeof(struct sadb_x_ipsecrequest) 2512 + isr->saidx.src.sa.sa_len 2513 + isr->saidx.dst.sa.sa_len; 2514 2515 tlen += PFKEY_ALIGN8(len); 2516 } 2517 } 2518 2519 return tlen; 2520} 2521 2522/* 2523 * SADB_SPDEXPIRE processing 2524 * send 2525 * <base, address(SD), lifetime(CH), policy> 2526 * to KMD by PF_KEY. 2527 * 2528 * OUT: 0 : succeed 2529 * others : error number 2530 */ 2531static int 2532key_spdexpire(sp) 2533 struct secpolicy *sp; 2534{ 2535 struct mbuf *result = NULL, *m; 2536 int len; 2537 int error = -1; 2538 struct sadb_lifetime *lt; 2539 2540 /* XXX: Why do we lock ? */ 2541 2542 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2543 2544 /* set msg header */ 2545 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2546 if (!m) { 2547 error = ENOBUFS; 2548 goto fail; 2549 } 2550 result = m; 2551 2552 /* create lifetime extension (current and hard) */ 2553 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2554 m = key_alloc_mbuf(len); 2555 if (!m || m->m_next) { /*XXX*/ 2556 if (m) 2557 m_freem(m); 2558 error = ENOBUFS; 2559 goto fail; 2560 } 2561 bzero(mtod(m, caddr_t), len); 2562 lt = mtod(m, struct sadb_lifetime *); 2563 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2564 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2565 lt->sadb_lifetime_allocations = 0; 2566 lt->sadb_lifetime_bytes = 0; 2567 lt->sadb_lifetime_addtime = sp->created; 2568 lt->sadb_lifetime_usetime = sp->lastused; 2569 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2570 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2571 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2572 lt->sadb_lifetime_allocations = 0; 2573 lt->sadb_lifetime_bytes = 0; 2574 lt->sadb_lifetime_addtime = sp->lifetime; 2575 lt->sadb_lifetime_usetime = sp->validtime; 2576 m_cat(result, m); 2577 2578 /* set sadb_address for source */ 2579 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2580 &sp->spidx.src.sa, 2581 sp->spidx.prefs, sp->spidx.ul_proto); 2582 if (!m) { 2583 error = ENOBUFS; 2584 goto fail; 2585 } 2586 m_cat(result, m); 2587 2588 /* set sadb_address for destination */ 2589 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2590 &sp->spidx.dst.sa, 2591 sp->spidx.prefd, sp->spidx.ul_proto); 2592 if (!m) { 2593 error = ENOBUFS; 2594 goto fail; 2595 } 2596 m_cat(result, m); 2597 2598 /* set secpolicy */ 2599 m = key_sp2msg(sp); 2600 if (!m) { 2601 error = ENOBUFS; 2602 goto fail; 2603 } 2604 m_cat(result, m); 2605 2606 if ((result->m_flags & M_PKTHDR) == 0) { 2607 error = EINVAL; 2608 goto fail; 2609 } 2610 2611 if (result->m_len < sizeof(struct sadb_msg)) { 2612 result = m_pullup(result, sizeof(struct sadb_msg)); 2613 if (result == NULL) { 2614 error = ENOBUFS; 2615 goto fail; 2616 } 2617 } 2618 2619 result->m_pkthdr.len = 0; 2620 for (m = result; m; m = m->m_next) 2621 result->m_pkthdr.len += m->m_len; 2622 2623 mtod(result, struct sadb_msg *)->sadb_msg_len = 2624 PFKEY_UNIT64(result->m_pkthdr.len); 2625 2626 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2627 2628 fail: 2629 if (result) 2630 m_freem(result); 2631 return error; 2632} 2633 2634/* %%% SAD management */ 2635/* 2636 * allocating a memory for new SA head, and copy from the values of mhp. 2637 * OUT: NULL : failure due to the lack of memory. 2638 * others : pointer to new SA head. 2639 */ 2640static struct secashead * 2641key_newsah(saidx) 2642 struct secasindex *saidx; 2643{ 2644 INIT_VNET_IPSEC(curvnet); 2645 struct secashead *newsah; 2646 2647 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2648 2649 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2650 if (newsah != NULL) { 2651 int i; 2652 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2653 LIST_INIT(&newsah->savtree[i]); 2654 newsah->saidx = *saidx; 2655 2656 /* add to saidxtree */ 2657 newsah->state = SADB_SASTATE_MATURE; 2658 2659 SAHTREE_LOCK(); 2660 LIST_INSERT_HEAD(&V_sahtree, newsah, chain); 2661 SAHTREE_UNLOCK(); 2662 } 2663 return(newsah); 2664} 2665 2666/* 2667 * delete SA index and all SA registerd. 2668 */ 2669static void 2670key_delsah(sah) 2671 struct secashead *sah; 2672{ 2673 INIT_VNET_IPSEC(curvnet); 2674 struct secasvar *sav, *nextsav; 2675 u_int stateidx; 2676 int zombie = 0; 2677 2678 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2679 SAHTREE_LOCK_ASSERT(); 2680 2681 /* searching all SA registerd in the secindex. */ 2682 for (stateidx = 0; 2683 stateidx < _ARRAYLEN(saorder_state_any); 2684 stateidx++) { 2685 u_int state = saorder_state_any[stateidx]; 2686 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2687 if (sav->refcnt == 0) { 2688 /* sanity check */ 2689 KEY_CHKSASTATE(state, sav->state, __func__); 2690 KEY_FREESAV(&sav); 2691 } else { 2692 /* give up to delete this sa */ 2693 zombie++; 2694 } 2695 } 2696 } 2697 if (!zombie) { /* delete only if there are savs */ 2698 /* remove from tree of SA index */ 2699 if (__LIST_CHAINED(sah)) 2700 LIST_REMOVE(sah, chain); 2701 if (sah->sa_route.ro_rt) { 2702 RTFREE(sah->sa_route.ro_rt); 2703 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2704 } 2705 free(sah, M_IPSEC_SAH); 2706 } 2707} 2708 2709/* 2710 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2711 * and copy the values of mhp into new buffer. 2712 * When SAD message type is GETSPI: 2713 * to set sequence number from acq_seq++, 2714 * to set zero to SPI. 2715 * not to call key_setsava(). 2716 * OUT: NULL : fail 2717 * others : pointer to new secasvar. 2718 * 2719 * does not modify mbuf. does not free mbuf on error. 2720 */ 2721static struct secasvar * 2722key_newsav(m, mhp, sah, errp, where, tag) 2723 struct mbuf *m; 2724 const struct sadb_msghdr *mhp; 2725 struct secashead *sah; 2726 int *errp; 2727 const char* where; 2728 int tag; 2729{ 2730 INIT_VNET_IPSEC(curvnet); 2731 struct secasvar *newsav; 2732 const struct sadb_sa *xsa; 2733 2734 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2735 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2736 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2737 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2738 2739 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2740 if (newsav == NULL) { 2741 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2742 *errp = ENOBUFS; 2743 goto done; 2744 } 2745 2746 switch (mhp->msg->sadb_msg_type) { 2747 case SADB_GETSPI: 2748 newsav->spi = 0; 2749 2750#ifdef IPSEC_DOSEQCHECK 2751 /* sync sequence number */ 2752 if (mhp->msg->sadb_msg_seq == 0) 2753 newsav->seq = 2754 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2755 else 2756#endif 2757 newsav->seq = mhp->msg->sadb_msg_seq; 2758 break; 2759 2760 case SADB_ADD: 2761 /* sanity check */ 2762 if (mhp->ext[SADB_EXT_SA] == NULL) { 2763 free(newsav, M_IPSEC_SA); 2764 newsav = NULL; 2765 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2766 __func__)); 2767 *errp = EINVAL; 2768 goto done; 2769 } 2770 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2771 newsav->spi = xsa->sadb_sa_spi; 2772 newsav->seq = mhp->msg->sadb_msg_seq; 2773 break; 2774 default: 2775 free(newsav, M_IPSEC_SA); 2776 newsav = NULL; 2777 *errp = EINVAL; 2778 goto done; 2779 } 2780 2781 2782 /* copy sav values */ 2783 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2784 *errp = key_setsaval(newsav, m, mhp); 2785 if (*errp) { 2786 free(newsav, M_IPSEC_SA); 2787 newsav = NULL; 2788 goto done; 2789 } 2790 } 2791 2792 SECASVAR_LOCK_INIT(newsav); 2793 2794 /* reset created */ 2795 newsav->created = time_second; 2796 newsav->pid = mhp->msg->sadb_msg_pid; 2797 2798 /* add to satree */ 2799 newsav->sah = sah; 2800 sa_initref(newsav); 2801 newsav->state = SADB_SASTATE_LARVAL; 2802 2803 /* XXX locking??? */ 2804 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2805 secasvar, chain); 2806done: 2807 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2808 printf("DP %s from %s:%u return SP:%p\n", __func__, 2809 where, tag, newsav)); 2810 2811 return newsav; 2812} 2813 2814/* 2815 * free() SA variable entry. 2816 */ 2817static void 2818key_cleansav(struct secasvar *sav) 2819{ 2820 /* 2821 * Cleanup xform state. Note that zeroize'ing causes the 2822 * keys to be cleared; otherwise we must do it ourself. 2823 */ 2824 if (sav->tdb_xform != NULL) { 2825 sav->tdb_xform->xf_zeroize(sav); 2826 sav->tdb_xform = NULL; 2827 } else { 2828 KASSERT(sav->iv == NULL, ("iv but no xform")); 2829 if (sav->key_auth != NULL) 2830 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2831 if (sav->key_enc != NULL) 2832 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2833 } 2834 if (sav->key_auth != NULL) { 2835 if (sav->key_auth->key_data != NULL) 2836 free(sav->key_auth->key_data, M_IPSEC_MISC); 2837 free(sav->key_auth, M_IPSEC_MISC); 2838 sav->key_auth = NULL; 2839 } 2840 if (sav->key_enc != NULL) { 2841 if (sav->key_enc->key_data != NULL) 2842 free(sav->key_enc->key_data, M_IPSEC_MISC); 2843 free(sav->key_enc, M_IPSEC_MISC); 2844 sav->key_enc = NULL; 2845 } 2846 if (sav->sched) { 2847 bzero(sav->sched, sav->schedlen); 2848 free(sav->sched, M_IPSEC_MISC); 2849 sav->sched = NULL; 2850 } 2851 if (sav->replay != NULL) { 2852 free(sav->replay, M_IPSEC_MISC); 2853 sav->replay = NULL; 2854 } 2855 if (sav->lft_c != NULL) { 2856 free(sav->lft_c, M_IPSEC_MISC); 2857 sav->lft_c = NULL; 2858 } 2859 if (sav->lft_h != NULL) { 2860 free(sav->lft_h, M_IPSEC_MISC); 2861 sav->lft_h = NULL; 2862 } 2863 if (sav->lft_s != NULL) { 2864 free(sav->lft_s, M_IPSEC_MISC); 2865 sav->lft_s = NULL; 2866 } 2867} 2868 2869/* 2870 * free() SA variable entry. 2871 */ 2872static void 2873key_delsav(sav) 2874 struct secasvar *sav; 2875{ 2876 IPSEC_ASSERT(sav != NULL, ("null sav")); 2877 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2878 2879 /* remove from SA header */ 2880 if (__LIST_CHAINED(sav)) 2881 LIST_REMOVE(sav, chain); 2882 key_cleansav(sav); 2883 SECASVAR_LOCK_DESTROY(sav); 2884 free(sav, M_IPSEC_SA); 2885} 2886 2887/* 2888 * search SAD. 2889 * OUT: 2890 * NULL : not found 2891 * others : found, pointer to a SA. 2892 */ 2893static struct secashead * 2894key_getsah(saidx) 2895 struct secasindex *saidx; 2896{ 2897 INIT_VNET_IPSEC(curvnet); 2898 struct secashead *sah; 2899 2900 SAHTREE_LOCK(); 2901 LIST_FOREACH(sah, &V_sahtree, chain) { 2902 if (sah->state == SADB_SASTATE_DEAD) 2903 continue; 2904 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2905 break; 2906 } 2907 SAHTREE_UNLOCK(); 2908 2909 return sah; 2910} 2911 2912/* 2913 * check not to be duplicated SPI. 2914 * NOTE: this function is too slow due to searching all SAD. 2915 * OUT: 2916 * NULL : not found 2917 * others : found, pointer to a SA. 2918 */ 2919static struct secasvar * 2920key_checkspidup(saidx, spi) 2921 struct secasindex *saidx; 2922 u_int32_t spi; 2923{ 2924 INIT_VNET_IPSEC(curvnet); 2925 struct secashead *sah; 2926 struct secasvar *sav; 2927 2928 /* check address family */ 2929 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2930 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2931 __func__)); 2932 return NULL; 2933 } 2934 2935 sav = NULL; 2936 /* check all SAD */ 2937 SAHTREE_LOCK(); 2938 LIST_FOREACH(sah, &V_sahtree, chain) { 2939 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2940 continue; 2941 sav = key_getsavbyspi(sah, spi); 2942 if (sav != NULL) 2943 break; 2944 } 2945 SAHTREE_UNLOCK(); 2946 2947 return sav; 2948} 2949 2950/* 2951 * search SAD litmited alive SA, protocol, SPI. 2952 * OUT: 2953 * NULL : not found 2954 * others : found, pointer to a SA. 2955 */ 2956static struct secasvar * 2957key_getsavbyspi(sah, spi) 2958 struct secashead *sah; 2959 u_int32_t spi; 2960{ 2961 INIT_VNET_IPSEC(curvnet); 2962 struct secasvar *sav; 2963 u_int stateidx, state; 2964 2965 sav = NULL; 2966 SAHTREE_LOCK_ASSERT(); 2967 /* search all status */ 2968 for (stateidx = 0; 2969 stateidx < _ARRAYLEN(saorder_state_alive); 2970 stateidx++) { 2971 2972 state = saorder_state_alive[stateidx]; 2973 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2974 2975 /* sanity check */ 2976 if (sav->state != state) { 2977 ipseclog((LOG_DEBUG, "%s: " 2978 "invalid sav->state (queue: %d SA: %d)\n", 2979 __func__, state, sav->state)); 2980 continue; 2981 } 2982 2983 if (sav->spi == spi) 2984 return sav; 2985 } 2986 } 2987 2988 return NULL; 2989} 2990 2991/* 2992 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2993 * You must update these if need. 2994 * OUT: 0: success. 2995 * !0: failure. 2996 * 2997 * does not modify mbuf. does not free mbuf on error. 2998 */ 2999static int 3000key_setsaval(sav, m, mhp) 3001 struct secasvar *sav; 3002 struct mbuf *m; 3003 const struct sadb_msghdr *mhp; 3004{ 3005 INIT_VNET_IPSEC(curvnet); 3006 int error = 0; 3007 3008 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3009 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3010 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3011 3012 /* initialization */ 3013 sav->replay = NULL; 3014 sav->key_auth = NULL; 3015 sav->key_enc = NULL; 3016 sav->sched = NULL; 3017 sav->schedlen = 0; 3018 sav->iv = NULL; 3019 sav->lft_c = NULL; 3020 sav->lft_h = NULL; 3021 sav->lft_s = NULL; 3022 sav->tdb_xform = NULL; /* transform */ 3023 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3024 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3025 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3026 3027 /* SA */ 3028 if (mhp->ext[SADB_EXT_SA] != NULL) { 3029 const struct sadb_sa *sa0; 3030 3031 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3032 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3033 error = EINVAL; 3034 goto fail; 3035 } 3036 3037 sav->alg_auth = sa0->sadb_sa_auth; 3038 sav->alg_enc = sa0->sadb_sa_encrypt; 3039 sav->flags = sa0->sadb_sa_flags; 3040 3041 /* replay window */ 3042 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3043 sav->replay = (struct secreplay *) 3044 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3045 if (sav->replay == NULL) { 3046 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3047 __func__)); 3048 error = ENOBUFS; 3049 goto fail; 3050 } 3051 if (sa0->sadb_sa_replay != 0) 3052 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3053 sav->replay->wsize = sa0->sadb_sa_replay; 3054 } 3055 } 3056 3057 /* Authentication keys */ 3058 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3059 const struct sadb_key *key0; 3060 int len; 3061 3062 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3063 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3064 3065 error = 0; 3066 if (len < sizeof(*key0)) { 3067 error = EINVAL; 3068 goto fail; 3069 } 3070 switch (mhp->msg->sadb_msg_satype) { 3071 case SADB_SATYPE_AH: 3072 case SADB_SATYPE_ESP: 3073 case SADB_X_SATYPE_TCPSIGNATURE: 3074 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3075 sav->alg_auth != SADB_X_AALG_NULL) 3076 error = EINVAL; 3077 break; 3078 case SADB_X_SATYPE_IPCOMP: 3079 default: 3080 error = EINVAL; 3081 break; 3082 } 3083 if (error) { 3084 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3085 __func__)); 3086 goto fail; 3087 } 3088 3089 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3090 M_IPSEC_MISC); 3091 if (sav->key_auth == NULL ) { 3092 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3093 __func__)); 3094 error = ENOBUFS; 3095 goto fail; 3096 } 3097 } 3098 3099 /* Encryption key */ 3100 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3101 const struct sadb_key *key0; 3102 int len; 3103 3104 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3105 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3106 3107 error = 0; 3108 if (len < sizeof(*key0)) { 3109 error = EINVAL; 3110 goto fail; 3111 } 3112 switch (mhp->msg->sadb_msg_satype) { 3113 case SADB_SATYPE_ESP: 3114 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3115 sav->alg_enc != SADB_EALG_NULL) { 3116 error = EINVAL; 3117 break; 3118 } 3119 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3120 len, 3121 M_IPSEC_MISC); 3122 if (sav->key_enc == NULL) { 3123 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3124 __func__)); 3125 error = ENOBUFS; 3126 goto fail; 3127 } 3128 break; 3129 case SADB_X_SATYPE_IPCOMP: 3130 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3131 error = EINVAL; 3132 sav->key_enc = NULL; /*just in case*/ 3133 break; 3134 case SADB_SATYPE_AH: 3135 case SADB_X_SATYPE_TCPSIGNATURE: 3136 default: 3137 error = EINVAL; 3138 break; 3139 } 3140 if (error) { 3141 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3142 __func__)); 3143 goto fail; 3144 } 3145 } 3146 3147 /* set iv */ 3148 sav->ivlen = 0; 3149 3150 switch (mhp->msg->sadb_msg_satype) { 3151 case SADB_SATYPE_AH: 3152 error = xform_init(sav, XF_AH); 3153 break; 3154 case SADB_SATYPE_ESP: 3155 error = xform_init(sav, XF_ESP); 3156 break; 3157 case SADB_X_SATYPE_IPCOMP: 3158 error = xform_init(sav, XF_IPCOMP); 3159 break; 3160 case SADB_X_SATYPE_TCPSIGNATURE: 3161 error = xform_init(sav, XF_TCPSIGNATURE); 3162 break; 3163 } 3164 if (error) { 3165 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3166 __func__, mhp->msg->sadb_msg_satype)); 3167 goto fail; 3168 } 3169 3170 /* reset created */ 3171 sav->created = time_second; 3172 3173 /* make lifetime for CURRENT */ 3174 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3175 if (sav->lft_c == NULL) { 3176 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3177 error = ENOBUFS; 3178 goto fail; 3179 } 3180 3181 sav->lft_c->allocations = 0; 3182 sav->lft_c->bytes = 0; 3183 sav->lft_c->addtime = time_second; 3184 sav->lft_c->usetime = 0; 3185 3186 /* lifetimes for HARD and SOFT */ 3187 { 3188 const struct sadb_lifetime *lft0; 3189 3190 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3191 if (lft0 != NULL) { 3192 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3193 error = EINVAL; 3194 goto fail; 3195 } 3196 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3197 if (sav->lft_h == NULL) { 3198 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3199 error = ENOBUFS; 3200 goto fail; 3201 } 3202 /* to be initialize ? */ 3203 } 3204 3205 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3206 if (lft0 != NULL) { 3207 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3208 error = EINVAL; 3209 goto fail; 3210 } 3211 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3212 if (sav->lft_s == NULL) { 3213 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3214 error = ENOBUFS; 3215 goto fail; 3216 } 3217 /* to be initialize ? */ 3218 } 3219 } 3220 3221 return 0; 3222 3223 fail: 3224 /* initialization */ 3225 key_cleansav(sav); 3226 3227 return error; 3228} 3229 3230/* 3231 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3232 * OUT: 0: valid 3233 * other: errno 3234 */ 3235static int 3236key_mature(struct secasvar *sav) 3237{ 3238 INIT_VNET_IPSEC(curvnet); 3239 int error; 3240 3241 /* check SPI value */ 3242 switch (sav->sah->saidx.proto) { 3243 case IPPROTO_ESP: 3244 case IPPROTO_AH: 3245 /* 3246 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3247 * 1-255 reserved by IANA for future use, 3248 * 0 for implementation specific, local use. 3249 */ 3250 if (ntohl(sav->spi) <= 255) { 3251 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3252 __func__, (u_int32_t)ntohl(sav->spi))); 3253 return EINVAL; 3254 } 3255 break; 3256 } 3257 3258 /* check satype */ 3259 switch (sav->sah->saidx.proto) { 3260 case IPPROTO_ESP: 3261 /* check flags */ 3262 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3263 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3264 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3265 "given to old-esp.\n", __func__)); 3266 return EINVAL; 3267 } 3268 error = xform_init(sav, XF_ESP); 3269 break; 3270 case IPPROTO_AH: 3271 /* check flags */ 3272 if (sav->flags & SADB_X_EXT_DERIV) { 3273 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3274 "given to AH SA.\n", __func__)); 3275 return EINVAL; 3276 } 3277 if (sav->alg_enc != SADB_EALG_NONE) { 3278 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3279 "mismated.\n", __func__)); 3280 return(EINVAL); 3281 } 3282 error = xform_init(sav, XF_AH); 3283 break; 3284 case IPPROTO_IPCOMP: 3285 if (sav->alg_auth != SADB_AALG_NONE) { 3286 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3287 "mismated.\n", __func__)); 3288 return(EINVAL); 3289 } 3290 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3291 && ntohl(sav->spi) >= 0x10000) { 3292 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3293 __func__)); 3294 return(EINVAL); 3295 } 3296 error = xform_init(sav, XF_IPCOMP); 3297 break; 3298 case IPPROTO_TCP: 3299 if (sav->alg_enc != SADB_EALG_NONE) { 3300 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3301 "mismated.\n", __func__)); 3302 return(EINVAL); 3303 } 3304 error = xform_init(sav, XF_TCPSIGNATURE); 3305 break; 3306 default: 3307 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3308 error = EPROTONOSUPPORT; 3309 break; 3310 } 3311 if (error == 0) { 3312 SAHTREE_LOCK(); 3313 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3314 SAHTREE_UNLOCK(); 3315 } 3316 return (error); 3317} 3318 3319/* 3320 * subroutine for SADB_GET and SADB_DUMP. 3321 */ 3322static struct mbuf * 3323key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3324 u_int32_t seq, u_int32_t pid) 3325{ 3326 struct mbuf *result = NULL, *tres = NULL, *m; 3327 int i; 3328 int dumporder[] = { 3329 SADB_EXT_SA, SADB_X_EXT_SA2, 3330 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3331 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3332 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3333 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3334 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3335 }; 3336 3337 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3338 if (m == NULL) 3339 goto fail; 3340 result = m; 3341 3342 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3343 m = NULL; 3344 switch (dumporder[i]) { 3345 case SADB_EXT_SA: 3346 m = key_setsadbsa(sav); 3347 if (!m) 3348 goto fail; 3349 break; 3350 3351 case SADB_X_EXT_SA2: 3352 m = key_setsadbxsa2(sav->sah->saidx.mode, 3353 sav->replay ? sav->replay->count : 0, 3354 sav->sah->saidx.reqid); 3355 if (!m) 3356 goto fail; 3357 break; 3358 3359 case SADB_EXT_ADDRESS_SRC: 3360 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3361 &sav->sah->saidx.src.sa, 3362 FULLMASK, IPSEC_ULPROTO_ANY); 3363 if (!m) 3364 goto fail; 3365 break; 3366 3367 case SADB_EXT_ADDRESS_DST: 3368 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3369 &sav->sah->saidx.dst.sa, 3370 FULLMASK, IPSEC_ULPROTO_ANY); 3371 if (!m) 3372 goto fail; 3373 break; 3374 3375 case SADB_EXT_KEY_AUTH: 3376 if (!sav->key_auth) 3377 continue; 3378 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3379 if (!m) 3380 goto fail; 3381 break; 3382 3383 case SADB_EXT_KEY_ENCRYPT: 3384 if (!sav->key_enc) 3385 continue; 3386 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3387 if (!m) 3388 goto fail; 3389 break; 3390 3391 case SADB_EXT_LIFETIME_CURRENT: 3392 if (!sav->lft_c) 3393 continue; 3394 m = key_setlifetime(sav->lft_c, 3395 SADB_EXT_LIFETIME_CURRENT); 3396 if (!m) 3397 goto fail; 3398 break; 3399 3400 case SADB_EXT_LIFETIME_HARD: 3401 if (!sav->lft_h) 3402 continue; 3403 m = key_setlifetime(sav->lft_h, 3404 SADB_EXT_LIFETIME_HARD); 3405 if (!m) 3406 goto fail; 3407 break; 3408 3409 case SADB_EXT_LIFETIME_SOFT: 3410 if (!sav->lft_s) 3411 continue; 3412 m = key_setlifetime(sav->lft_s, 3413 SADB_EXT_LIFETIME_SOFT); 3414 3415 if (!m) 3416 goto fail; 3417 break; 3418 3419 case SADB_EXT_ADDRESS_PROXY: 3420 case SADB_EXT_IDENTITY_SRC: 3421 case SADB_EXT_IDENTITY_DST: 3422 /* XXX: should we brought from SPD ? */ 3423 case SADB_EXT_SENSITIVITY: 3424 default: 3425 continue; 3426 } 3427 3428 if (!m) 3429 goto fail; 3430 if (tres) 3431 m_cat(m, tres); 3432 tres = m; 3433 3434 } 3435 3436 m_cat(result, tres); 3437 if (result->m_len < sizeof(struct sadb_msg)) { 3438 result = m_pullup(result, sizeof(struct sadb_msg)); 3439 if (result == NULL) 3440 goto fail; 3441 } 3442 3443 result->m_pkthdr.len = 0; 3444 for (m = result; m; m = m->m_next) 3445 result->m_pkthdr.len += m->m_len; 3446 3447 mtod(result, struct sadb_msg *)->sadb_msg_len = 3448 PFKEY_UNIT64(result->m_pkthdr.len); 3449 3450 return result; 3451 3452fail: 3453 m_freem(result); 3454 m_freem(tres); 3455 return NULL; 3456} 3457 3458/* 3459 * set data into sadb_msg. 3460 */ 3461static struct mbuf * 3462key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3463 pid_t pid, u_int16_t reserved) 3464{ 3465 struct mbuf *m; 3466 struct sadb_msg *p; 3467 int len; 3468 3469 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3470 if (len > MCLBYTES) 3471 return NULL; 3472 MGETHDR(m, M_DONTWAIT, MT_DATA); 3473 if (m && len > MHLEN) { 3474 MCLGET(m, M_DONTWAIT); 3475 if ((m->m_flags & M_EXT) == 0) { 3476 m_freem(m); 3477 m = NULL; 3478 } 3479 } 3480 if (!m) 3481 return NULL; 3482 m->m_pkthdr.len = m->m_len = len; 3483 m->m_next = NULL; 3484 3485 p = mtod(m, struct sadb_msg *); 3486 3487 bzero(p, len); 3488 p->sadb_msg_version = PF_KEY_V2; 3489 p->sadb_msg_type = type; 3490 p->sadb_msg_errno = 0; 3491 p->sadb_msg_satype = satype; 3492 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3493 p->sadb_msg_reserved = reserved; 3494 p->sadb_msg_seq = seq; 3495 p->sadb_msg_pid = (u_int32_t)pid; 3496 3497 return m; 3498} 3499 3500/* 3501 * copy secasvar data into sadb_address. 3502 */ 3503static struct mbuf * 3504key_setsadbsa(sav) 3505 struct secasvar *sav; 3506{ 3507 struct mbuf *m; 3508 struct sadb_sa *p; 3509 int len; 3510 3511 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3512 m = key_alloc_mbuf(len); 3513 if (!m || m->m_next) { /*XXX*/ 3514 if (m) 3515 m_freem(m); 3516 return NULL; 3517 } 3518 3519 p = mtod(m, struct sadb_sa *); 3520 3521 bzero(p, len); 3522 p->sadb_sa_len = PFKEY_UNIT64(len); 3523 p->sadb_sa_exttype = SADB_EXT_SA; 3524 p->sadb_sa_spi = sav->spi; 3525 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3526 p->sadb_sa_state = sav->state; 3527 p->sadb_sa_auth = sav->alg_auth; 3528 p->sadb_sa_encrypt = sav->alg_enc; 3529 p->sadb_sa_flags = sav->flags; 3530 3531 return m; 3532} 3533 3534/* 3535 * set data into sadb_address. 3536 */ 3537static struct mbuf * 3538key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3539{ 3540 struct mbuf *m; 3541 struct sadb_address *p; 3542 size_t len; 3543 3544 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3545 PFKEY_ALIGN8(saddr->sa_len); 3546 m = key_alloc_mbuf(len); 3547 if (!m || m->m_next) { /*XXX*/ 3548 if (m) 3549 m_freem(m); 3550 return NULL; 3551 } 3552 3553 p = mtod(m, struct sadb_address *); 3554 3555 bzero(p, len); 3556 p->sadb_address_len = PFKEY_UNIT64(len); 3557 p->sadb_address_exttype = exttype; 3558 p->sadb_address_proto = ul_proto; 3559 if (prefixlen == FULLMASK) { 3560 switch (saddr->sa_family) { 3561 case AF_INET: 3562 prefixlen = sizeof(struct in_addr) << 3; 3563 break; 3564 case AF_INET6: 3565 prefixlen = sizeof(struct in6_addr) << 3; 3566 break; 3567 default: 3568 ; /*XXX*/ 3569 } 3570 } 3571 p->sadb_address_prefixlen = prefixlen; 3572 p->sadb_address_reserved = 0; 3573 3574 bcopy(saddr, 3575 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3576 saddr->sa_len); 3577 3578 return m; 3579} 3580 3581/* 3582 * set data into sadb_x_sa2. 3583 */ 3584static struct mbuf * 3585key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3586{ 3587 struct mbuf *m; 3588 struct sadb_x_sa2 *p; 3589 size_t len; 3590 3591 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3592 m = key_alloc_mbuf(len); 3593 if (!m || m->m_next) { /*XXX*/ 3594 if (m) 3595 m_freem(m); 3596 return NULL; 3597 } 3598 3599 p = mtod(m, struct sadb_x_sa2 *); 3600 3601 bzero(p, len); 3602 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3603 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3604 p->sadb_x_sa2_mode = mode; 3605 p->sadb_x_sa2_reserved1 = 0; 3606 p->sadb_x_sa2_reserved2 = 0; 3607 p->sadb_x_sa2_sequence = seq; 3608 p->sadb_x_sa2_reqid = reqid; 3609 3610 return m; 3611} 3612 3613/* 3614 * set data into sadb_x_policy 3615 */ 3616static struct mbuf * 3617key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3618{ 3619 struct mbuf *m; 3620 struct sadb_x_policy *p; 3621 size_t len; 3622 3623 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3624 m = key_alloc_mbuf(len); 3625 if (!m || m->m_next) { /*XXX*/ 3626 if (m) 3627 m_freem(m); 3628 return NULL; 3629 } 3630 3631 p = mtod(m, struct sadb_x_policy *); 3632 3633 bzero(p, len); 3634 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3635 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3636 p->sadb_x_policy_type = type; 3637 p->sadb_x_policy_dir = dir; 3638 p->sadb_x_policy_id = id; 3639 3640 return m; 3641} 3642 3643/* %%% utilities */ 3644/* Take a key message (sadb_key) from the socket and turn it into one 3645 * of the kernel's key structures (seckey). 3646 * 3647 * IN: pointer to the src 3648 * OUT: NULL no more memory 3649 */ 3650struct seckey * 3651key_dup_keymsg(const struct sadb_key *src, u_int len, 3652 struct malloc_type *type) 3653{ 3654 INIT_VNET_IPSEC(curvnet); 3655 struct seckey *dst; 3656 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3657 if (dst != NULL) { 3658 dst->bits = src->sadb_key_bits; 3659 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3660 if (dst->key_data != NULL) { 3661 bcopy((const char *)src + sizeof(struct sadb_key), 3662 dst->key_data, len); 3663 } else { 3664 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3665 __func__)); 3666 free(dst, type); 3667 dst = NULL; 3668 } 3669 } else { 3670 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3671 __func__)); 3672 3673 } 3674 return dst; 3675} 3676 3677/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3678 * turn it into one of the kernel's lifetime structures (seclifetime). 3679 * 3680 * IN: pointer to the destination, source and malloc type 3681 * OUT: NULL, no more memory 3682 */ 3683 3684static struct seclifetime * 3685key_dup_lifemsg(const struct sadb_lifetime *src, 3686 struct malloc_type *type) 3687{ 3688 INIT_VNET_IPSEC(curvnet); 3689 struct seclifetime *dst = NULL; 3690 3691 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3692 type, M_NOWAIT); 3693 if (dst == NULL) { 3694 /* XXX counter */ 3695 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3696 } else { 3697 dst->allocations = src->sadb_lifetime_allocations; 3698 dst->bytes = src->sadb_lifetime_bytes; 3699 dst->addtime = src->sadb_lifetime_addtime; 3700 dst->usetime = src->sadb_lifetime_usetime; 3701 } 3702 return dst; 3703} 3704 3705/* compare my own address 3706 * OUT: 1: true, i.e. my address. 3707 * 0: false 3708 */ 3709int 3710key_ismyaddr(sa) 3711 struct sockaddr *sa; 3712{ 3713#ifdef INET 3714 INIT_VNET_INET(curvnet); 3715 struct sockaddr_in *sin; 3716 struct in_ifaddr *ia; 3717#endif 3718 3719 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3720 3721 switch (sa->sa_family) { 3722#ifdef INET 3723 case AF_INET: 3724 sin = (struct sockaddr_in *)sa; 3725 for (ia = V_in_ifaddrhead.tqh_first; ia; 3726 ia = ia->ia_link.tqe_next) 3727 { 3728 if (sin->sin_family == ia->ia_addr.sin_family && 3729 sin->sin_len == ia->ia_addr.sin_len && 3730 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3731 { 3732 return 1; 3733 } 3734 } 3735 break; 3736#endif 3737#ifdef INET6 3738 case AF_INET6: 3739 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3740#endif 3741 } 3742 3743 return 0; 3744} 3745 3746#ifdef INET6 3747/* 3748 * compare my own address for IPv6. 3749 * 1: ours 3750 * 0: other 3751 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3752 */ 3753#include <netinet6/in6_var.h> 3754 3755static int 3756key_ismyaddr6(sin6) 3757 struct sockaddr_in6 *sin6; 3758{ 3759 INIT_VNET_INET6(curvnet); 3760 struct in6_ifaddr *ia; 3761 struct in6_multi *in6m; 3762 3763 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3764 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3765 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3766 return 1; 3767 3768 /* 3769 * XXX Multicast 3770 * XXX why do we care about multlicast here while we don't care 3771 * about IPv4 multicast?? 3772 * XXX scope 3773 */ 3774 in6m = NULL; 3775 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3776 if (in6m) 3777 return 1; 3778 } 3779 3780 /* loopback, just for safety */ 3781 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3782 return 1; 3783 3784 return 0; 3785} 3786#endif /*INET6*/ 3787 3788/* 3789 * compare two secasindex structure. 3790 * flag can specify to compare 2 saidxes. 3791 * compare two secasindex structure without both mode and reqid. 3792 * don't compare port. 3793 * IN: 3794 * saidx0: source, it can be in SAD. 3795 * saidx1: object. 3796 * OUT: 3797 * 1 : equal 3798 * 0 : not equal 3799 */ 3800static int 3801key_cmpsaidx( 3802 const struct secasindex *saidx0, 3803 const struct secasindex *saidx1, 3804 int flag) 3805{ 3806 /* sanity */ 3807 if (saidx0 == NULL && saidx1 == NULL) 3808 return 1; 3809 3810 if (saidx0 == NULL || saidx1 == NULL) 3811 return 0; 3812 3813 if (saidx0->proto != saidx1->proto) 3814 return 0; 3815 3816 if (flag == CMP_EXACTLY) { 3817 if (saidx0->mode != saidx1->mode) 3818 return 0; 3819 if (saidx0->reqid != saidx1->reqid) 3820 return 0; 3821 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3822 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3823 return 0; 3824 } else { 3825 3826 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3827 if (flag == CMP_MODE_REQID 3828 ||flag == CMP_REQID) { 3829 /* 3830 * If reqid of SPD is non-zero, unique SA is required. 3831 * The result must be of same reqid in this case. 3832 */ 3833 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3834 return 0; 3835 } 3836 3837 if (flag == CMP_MODE_REQID) { 3838 if (saidx0->mode != IPSEC_MODE_ANY 3839 && saidx0->mode != saidx1->mode) 3840 return 0; 3841 } 3842 3843 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3844 return 0; 3845 } 3846 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3847 return 0; 3848 } 3849 } 3850 3851 return 1; 3852} 3853 3854/* 3855 * compare two secindex structure exactly. 3856 * IN: 3857 * spidx0: source, it is often in SPD. 3858 * spidx1: object, it is often from PFKEY message. 3859 * OUT: 3860 * 1 : equal 3861 * 0 : not equal 3862 */ 3863static int 3864key_cmpspidx_exactly( 3865 struct secpolicyindex *spidx0, 3866 struct secpolicyindex *spidx1) 3867{ 3868 /* sanity */ 3869 if (spidx0 == NULL && spidx1 == NULL) 3870 return 1; 3871 3872 if (spidx0 == NULL || spidx1 == NULL) 3873 return 0; 3874 3875 if (spidx0->prefs != spidx1->prefs 3876 || spidx0->prefd != spidx1->prefd 3877 || spidx0->ul_proto != spidx1->ul_proto) 3878 return 0; 3879 3880 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3881 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3882} 3883 3884/* 3885 * compare two secindex structure with mask. 3886 * IN: 3887 * spidx0: source, it is often in SPD. 3888 * spidx1: object, it is often from IP header. 3889 * OUT: 3890 * 1 : equal 3891 * 0 : not equal 3892 */ 3893static int 3894key_cmpspidx_withmask( 3895 struct secpolicyindex *spidx0, 3896 struct secpolicyindex *spidx1) 3897{ 3898 /* sanity */ 3899 if (spidx0 == NULL && spidx1 == NULL) 3900 return 1; 3901 3902 if (spidx0 == NULL || spidx1 == NULL) 3903 return 0; 3904 3905 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3906 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3907 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3908 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3909 return 0; 3910 3911 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3912 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3913 && spidx0->ul_proto != spidx1->ul_proto) 3914 return 0; 3915 3916 switch (spidx0->src.sa.sa_family) { 3917 case AF_INET: 3918 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3919 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3920 return 0; 3921 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3922 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3923 return 0; 3924 break; 3925 case AF_INET6: 3926 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3927 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3928 return 0; 3929 /* 3930 * scope_id check. if sin6_scope_id is 0, we regard it 3931 * as a wildcard scope, which matches any scope zone ID. 3932 */ 3933 if (spidx0->src.sin6.sin6_scope_id && 3934 spidx1->src.sin6.sin6_scope_id && 3935 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3936 return 0; 3937 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3938 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3939 return 0; 3940 break; 3941 default: 3942 /* XXX */ 3943 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3944 return 0; 3945 break; 3946 } 3947 3948 switch (spidx0->dst.sa.sa_family) { 3949 case AF_INET: 3950 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3951 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3952 return 0; 3953 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3954 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3955 return 0; 3956 break; 3957 case AF_INET6: 3958 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3959 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3960 return 0; 3961 /* 3962 * scope_id check. if sin6_scope_id is 0, we regard it 3963 * as a wildcard scope, which matches any scope zone ID. 3964 */ 3965 if (spidx0->dst.sin6.sin6_scope_id && 3966 spidx1->dst.sin6.sin6_scope_id && 3967 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3968 return 0; 3969 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3970 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3971 return 0; 3972 break; 3973 default: 3974 /* XXX */ 3975 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3976 return 0; 3977 break; 3978 } 3979 3980 /* XXX Do we check other field ? e.g. flowinfo */ 3981 3982 return 1; 3983} 3984 3985/* returns 0 on match */ 3986static int 3987key_sockaddrcmp( 3988 const struct sockaddr *sa1, 3989 const struct sockaddr *sa2, 3990 int port) 3991{ 3992#ifdef satosin 3993#undef satosin 3994#endif 3995#define satosin(s) ((const struct sockaddr_in *)s) 3996#ifdef satosin6 3997#undef satosin6 3998#endif 3999#define satosin6(s) ((const struct sockaddr_in6 *)s) 4000 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4001 return 1; 4002 4003 switch (sa1->sa_family) { 4004 case AF_INET: 4005 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4006 return 1; 4007 if (satosin(sa1)->sin_addr.s_addr != 4008 satosin(sa2)->sin_addr.s_addr) { 4009 return 1; 4010 } 4011 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4012 return 1; 4013 break; 4014 case AF_INET6: 4015 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4016 return 1; /*EINVAL*/ 4017 if (satosin6(sa1)->sin6_scope_id != 4018 satosin6(sa2)->sin6_scope_id) { 4019 return 1; 4020 } 4021 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4022 &satosin6(sa2)->sin6_addr)) { 4023 return 1; 4024 } 4025 if (port && 4026 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4027 return 1; 4028 } 4029 break; 4030 default: 4031 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4032 return 1; 4033 break; 4034 } 4035 4036 return 0; 4037#undef satosin 4038#undef satosin6 4039} 4040 4041/* 4042 * compare two buffers with mask. 4043 * IN: 4044 * addr1: source 4045 * addr2: object 4046 * bits: Number of bits to compare 4047 * OUT: 4048 * 1 : equal 4049 * 0 : not equal 4050 */ 4051static int 4052key_bbcmp(const void *a1, const void *a2, u_int bits) 4053{ 4054 const unsigned char *p1 = a1; 4055 const unsigned char *p2 = a2; 4056 4057 /* XXX: This could be considerably faster if we compare a word 4058 * at a time, but it is complicated on LSB Endian machines */ 4059 4060 /* Handle null pointers */ 4061 if (p1 == NULL || p2 == NULL) 4062 return (p1 == p2); 4063 4064 while (bits >= 8) { 4065 if (*p1++ != *p2++) 4066 return 0; 4067 bits -= 8; 4068 } 4069 4070 if (bits > 0) { 4071 u_int8_t mask = ~((1<<(8-bits))-1); 4072 if ((*p1 & mask) != (*p2 & mask)) 4073 return 0; 4074 } 4075 return 1; /* Match! */ 4076} 4077 4078static void 4079key_flush_spd(time_t now) 4080{ 4081 INIT_VNET_IPSEC(curvnet); 4082 static u_int16_t sptree_scangen = 0; 4083 u_int16_t gen = sptree_scangen++; 4084 struct secpolicy *sp; 4085 u_int dir; 4086 4087 /* SPD */ 4088 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4089restart: 4090 SPTREE_LOCK(); 4091 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4092 if (sp->scangen == gen) /* previously handled */ 4093 continue; 4094 sp->scangen = gen; 4095 if (sp->state == IPSEC_SPSTATE_DEAD) { 4096 /* NB: clean entries created by key_spdflush */ 4097 SPTREE_UNLOCK(); 4098 KEY_FREESP(&sp); 4099 goto restart; 4100 } 4101 if (sp->lifetime == 0 && sp->validtime == 0) 4102 continue; 4103 if ((sp->lifetime && now - sp->created > sp->lifetime) 4104 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4105 sp->state = IPSEC_SPSTATE_DEAD; 4106 SPTREE_UNLOCK(); 4107 key_spdexpire(sp); 4108 KEY_FREESP(&sp); 4109 goto restart; 4110 } 4111 } 4112 SPTREE_UNLOCK(); 4113 } 4114} 4115 4116static void 4117key_flush_sad(time_t now) 4118{ 4119 INIT_VNET_IPSEC(curvnet); 4120 struct secashead *sah, *nextsah; 4121 struct secasvar *sav, *nextsav; 4122 4123 /* SAD */ 4124 SAHTREE_LOCK(); 4125 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4126 /* if sah has been dead, then delete it and process next sah. */ 4127 if (sah->state == SADB_SASTATE_DEAD) { 4128 key_delsah(sah); 4129 continue; 4130 } 4131 4132 /* if LARVAL entry doesn't become MATURE, delete it. */ 4133 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4134 if (now - sav->created > V_key_larval_lifetime) 4135 KEY_FREESAV(&sav); 4136 } 4137 4138 /* 4139 * check MATURE entry to start to send expire message 4140 * whether or not. 4141 */ 4142 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4143 /* we don't need to check. */ 4144 if (sav->lft_s == NULL) 4145 continue; 4146 4147 /* sanity check */ 4148 if (sav->lft_c == NULL) { 4149 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4150 "time, why?\n", __func__)); 4151 continue; 4152 } 4153 4154 /* check SOFT lifetime */ 4155 if (sav->lft_s->addtime != 0 && 4156 now - sav->created > sav->lft_s->addtime) { 4157 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4158 /* Actually, only send expire message if SA has been used, as it 4159 * was done before, but should we always send such message, and let IKE 4160 * daemon decide if it should be renegociated or not ? 4161 * XXX expire message will actually NOT be sent if SA is only used 4162 * after soft lifetime has been reached, see below (DYING state) 4163 */ 4164 if (sav->lft_c->usetime != 0) 4165 key_expire(sav); 4166 } 4167 /* check SOFT lifetime by bytes */ 4168 /* 4169 * XXX I don't know the way to delete this SA 4170 * when new SA is installed. Caution when it's 4171 * installed too big lifetime by time. 4172 */ 4173 else if (sav->lft_s->bytes != 0 && 4174 sav->lft_s->bytes < sav->lft_c->bytes) { 4175 4176 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4177 /* 4178 * XXX If we keep to send expire 4179 * message in the status of 4180 * DYING. Do remove below code. 4181 */ 4182 key_expire(sav); 4183 } 4184 } 4185 4186 /* check DYING entry to change status to DEAD. */ 4187 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4188 /* we don't need to check. */ 4189 if (sav->lft_h == NULL) 4190 continue; 4191 4192 /* sanity check */ 4193 if (sav->lft_c == NULL) { 4194 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4195 "time, why?\n", __func__)); 4196 continue; 4197 } 4198 4199 if (sav->lft_h->addtime != 0 && 4200 now - sav->created > sav->lft_h->addtime) { 4201 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4202 KEY_FREESAV(&sav); 4203 } 4204#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4205 else if (sav->lft_s != NULL 4206 && sav->lft_s->addtime != 0 4207 && now - sav->created > sav->lft_s->addtime) { 4208 /* 4209 * XXX: should be checked to be 4210 * installed the valid SA. 4211 */ 4212 4213 /* 4214 * If there is no SA then sending 4215 * expire message. 4216 */ 4217 key_expire(sav); 4218 } 4219#endif 4220 /* check HARD lifetime by bytes */ 4221 else if (sav->lft_h->bytes != 0 && 4222 sav->lft_h->bytes < sav->lft_c->bytes) { 4223 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4224 KEY_FREESAV(&sav); 4225 } 4226 } 4227 4228 /* delete entry in DEAD */ 4229 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4230 /* sanity check */ 4231 if (sav->state != SADB_SASTATE_DEAD) { 4232 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4233 "(queue: %d SA: %d): kill it anyway\n", 4234 __func__, 4235 SADB_SASTATE_DEAD, sav->state)); 4236 } 4237 /* 4238 * do not call key_freesav() here. 4239 * sav should already be freed, and sav->refcnt 4240 * shows other references to sav 4241 * (such as from SPD). 4242 */ 4243 } 4244 } 4245 SAHTREE_UNLOCK(); 4246} 4247 4248static void 4249key_flush_acq(time_t now) 4250{ 4251 INIT_VNET_IPSEC(curvnet); 4252 struct secacq *acq, *nextacq; 4253 4254 /* ACQ tree */ 4255 ACQ_LOCK(); 4256 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4257 nextacq = LIST_NEXT(acq, chain); 4258 if (now - acq->created > V_key_blockacq_lifetime 4259 && __LIST_CHAINED(acq)) { 4260 LIST_REMOVE(acq, chain); 4261 free(acq, M_IPSEC_SAQ); 4262 } 4263 } 4264 ACQ_UNLOCK(); 4265} 4266 4267static void 4268key_flush_spacq(time_t now) 4269{ 4270 INIT_VNET_IPSEC(curvnet); 4271 struct secspacq *acq, *nextacq; 4272 4273 /* SP ACQ tree */ 4274 SPACQ_LOCK(); 4275 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4276 nextacq = LIST_NEXT(acq, chain); 4277 if (now - acq->created > V_key_blockacq_lifetime 4278 && __LIST_CHAINED(acq)) { 4279 LIST_REMOVE(acq, chain); 4280 free(acq, M_IPSEC_SAQ); 4281 } 4282 } 4283 SPACQ_UNLOCK(); 4284} 4285 4286/* 4287 * time handler. 4288 * scanning SPD and SAD to check status for each entries, 4289 * and do to remove or to expire. 4290 * XXX: year 2038 problem may remain. 4291 */ 4292void 4293key_timehandler(void) 4294{ 4295 VNET_ITERATOR_DECL(vnet_iter); 4296 time_t now = time_second; 4297 4298 VNET_LIST_RLOCK(); 4299 VNET_FOREACH(vnet_iter) { 4300 CURVNET_SET(vnet_iter); 4301 key_flush_spd(now); 4302 key_flush_sad(now); 4303 key_flush_acq(now); 4304 key_flush_spacq(now); 4305 CURVNET_RESTORE(); 4306 } 4307 VNET_LIST_RUNLOCK(); 4308 4309#ifndef IPSEC_DEBUG2 4310 /* do exchange to tick time !! */ 4311 (void)timeout((void *)key_timehandler, (void *)0, hz); 4312#endif /* IPSEC_DEBUG2 */ 4313} 4314 4315u_long 4316key_random() 4317{ 4318 u_long value; 4319 4320 key_randomfill(&value, sizeof(value)); 4321 return value; 4322} 4323 4324void 4325key_randomfill(p, l) 4326 void *p; 4327 size_t l; 4328{ 4329 size_t n; 4330 u_long v; 4331 static int warn = 1; 4332 4333 n = 0; 4334 n = (size_t)read_random(p, (u_int)l); 4335 /* last resort */ 4336 while (n < l) { 4337 v = random(); 4338 bcopy(&v, (u_int8_t *)p + n, 4339 l - n < sizeof(v) ? l - n : sizeof(v)); 4340 n += sizeof(v); 4341 4342 if (warn) { 4343 printf("WARNING: pseudo-random number generator " 4344 "used for IPsec processing\n"); 4345 warn = 0; 4346 } 4347 } 4348} 4349 4350/* 4351 * map SADB_SATYPE_* to IPPROTO_*. 4352 * if satype == SADB_SATYPE then satype is mapped to ~0. 4353 * OUT: 4354 * 0: invalid satype. 4355 */ 4356static u_int16_t 4357key_satype2proto(u_int8_t satype) 4358{ 4359 switch (satype) { 4360 case SADB_SATYPE_UNSPEC: 4361 return IPSEC_PROTO_ANY; 4362 case SADB_SATYPE_AH: 4363 return IPPROTO_AH; 4364 case SADB_SATYPE_ESP: 4365 return IPPROTO_ESP; 4366 case SADB_X_SATYPE_IPCOMP: 4367 return IPPROTO_IPCOMP; 4368 case SADB_X_SATYPE_TCPSIGNATURE: 4369 return IPPROTO_TCP; 4370 default: 4371 return 0; 4372 } 4373 /* NOTREACHED */ 4374} 4375 4376/* 4377 * map IPPROTO_* to SADB_SATYPE_* 4378 * OUT: 4379 * 0: invalid protocol type. 4380 */ 4381static u_int8_t 4382key_proto2satype(u_int16_t proto) 4383{ 4384 switch (proto) { 4385 case IPPROTO_AH: 4386 return SADB_SATYPE_AH; 4387 case IPPROTO_ESP: 4388 return SADB_SATYPE_ESP; 4389 case IPPROTO_IPCOMP: 4390 return SADB_X_SATYPE_IPCOMP; 4391 case IPPROTO_TCP: 4392 return SADB_X_SATYPE_TCPSIGNATURE; 4393 default: 4394 return 0; 4395 } 4396 /* NOTREACHED */ 4397} 4398 4399/* %%% PF_KEY */ 4400/* 4401 * SADB_GETSPI processing is to receive 4402 * <base, (SA2), src address, dst address, (SPI range)> 4403 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4404 * tree with the status of LARVAL, and send 4405 * <base, SA(*), address(SD)> 4406 * to the IKMPd. 4407 * 4408 * IN: mhp: pointer to the pointer to each header. 4409 * OUT: NULL if fail. 4410 * other if success, return pointer to the message to send. 4411 */ 4412static int 4413key_getspi(so, m, mhp) 4414 struct socket *so; 4415 struct mbuf *m; 4416 const struct sadb_msghdr *mhp; 4417{ 4418 INIT_VNET_IPSEC(curvnet); 4419 struct sadb_address *src0, *dst0; 4420 struct secasindex saidx; 4421 struct secashead *newsah; 4422 struct secasvar *newsav; 4423 u_int8_t proto; 4424 u_int32_t spi; 4425 u_int8_t mode; 4426 u_int32_t reqid; 4427 int error; 4428 4429 IPSEC_ASSERT(so != NULL, ("null socket")); 4430 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4431 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4432 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4433 4434 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4435 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4436 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4437 __func__)); 4438 return key_senderror(so, m, EINVAL); 4439 } 4440 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4441 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4442 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4443 __func__)); 4444 return key_senderror(so, m, EINVAL); 4445 } 4446 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4447 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4448 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4449 } else { 4450 mode = IPSEC_MODE_ANY; 4451 reqid = 0; 4452 } 4453 4454 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4455 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4456 4457 /* map satype to proto */ 4458 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4459 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4460 __func__)); 4461 return key_senderror(so, m, EINVAL); 4462 } 4463 4464 /* make sure if port number is zero. */ 4465 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4466 case AF_INET: 4467 if (((struct sockaddr *)(src0 + 1))->sa_len != 4468 sizeof(struct sockaddr_in)) 4469 return key_senderror(so, m, EINVAL); 4470 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4471 break; 4472 case AF_INET6: 4473 if (((struct sockaddr *)(src0 + 1))->sa_len != 4474 sizeof(struct sockaddr_in6)) 4475 return key_senderror(so, m, EINVAL); 4476 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4477 break; 4478 default: 4479 ; /*???*/ 4480 } 4481 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4482 case AF_INET: 4483 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4484 sizeof(struct sockaddr_in)) 4485 return key_senderror(so, m, EINVAL); 4486 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4487 break; 4488 case AF_INET6: 4489 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4490 sizeof(struct sockaddr_in6)) 4491 return key_senderror(so, m, EINVAL); 4492 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4493 break; 4494 default: 4495 ; /*???*/ 4496 } 4497 4498 /* XXX boundary check against sa_len */ 4499 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4500 4501 /* SPI allocation */ 4502 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4503 &saidx); 4504 if (spi == 0) 4505 return key_senderror(so, m, EINVAL); 4506 4507 /* get a SA index */ 4508 if ((newsah = key_getsah(&saidx)) == NULL) { 4509 /* create a new SA index */ 4510 if ((newsah = key_newsah(&saidx)) == NULL) { 4511 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4512 return key_senderror(so, m, ENOBUFS); 4513 } 4514 } 4515 4516 /* get a new SA */ 4517 /* XXX rewrite */ 4518 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4519 if (newsav == NULL) { 4520 /* XXX don't free new SA index allocated in above. */ 4521 return key_senderror(so, m, error); 4522 } 4523 4524 /* set spi */ 4525 newsav->spi = htonl(spi); 4526 4527 /* delete the entry in acqtree */ 4528 if (mhp->msg->sadb_msg_seq != 0) { 4529 struct secacq *acq; 4530 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4531 /* reset counter in order to deletion by timehandler. */ 4532 acq->created = time_second; 4533 acq->count = 0; 4534 } 4535 } 4536 4537 { 4538 struct mbuf *n, *nn; 4539 struct sadb_sa *m_sa; 4540 struct sadb_msg *newmsg; 4541 int off, len; 4542 4543 /* create new sadb_msg to reply. */ 4544 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4545 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4546 4547 MGETHDR(n, M_DONTWAIT, MT_DATA); 4548 if (len > MHLEN) { 4549 MCLGET(n, M_DONTWAIT); 4550 if ((n->m_flags & M_EXT) == 0) { 4551 m_freem(n); 4552 n = NULL; 4553 } 4554 } 4555 if (!n) 4556 return key_senderror(so, m, ENOBUFS); 4557 4558 n->m_len = len; 4559 n->m_next = NULL; 4560 off = 0; 4561 4562 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4563 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4564 4565 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4566 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4567 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4568 m_sa->sadb_sa_spi = htonl(spi); 4569 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4570 4571 IPSEC_ASSERT(off == len, 4572 ("length inconsistency (off %u len %u)", off, len)); 4573 4574 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4575 SADB_EXT_ADDRESS_DST); 4576 if (!n->m_next) { 4577 m_freem(n); 4578 return key_senderror(so, m, ENOBUFS); 4579 } 4580 4581 if (n->m_len < sizeof(struct sadb_msg)) { 4582 n = m_pullup(n, sizeof(struct sadb_msg)); 4583 if (n == NULL) 4584 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4585 } 4586 4587 n->m_pkthdr.len = 0; 4588 for (nn = n; nn; nn = nn->m_next) 4589 n->m_pkthdr.len += nn->m_len; 4590 4591 newmsg = mtod(n, struct sadb_msg *); 4592 newmsg->sadb_msg_seq = newsav->seq; 4593 newmsg->sadb_msg_errno = 0; 4594 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4595 4596 m_freem(m); 4597 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4598 } 4599} 4600 4601/* 4602 * allocating new SPI 4603 * called by key_getspi(). 4604 * OUT: 4605 * 0: failure. 4606 * others: success. 4607 */ 4608static u_int32_t 4609key_do_getnewspi(spirange, saidx) 4610 struct sadb_spirange *spirange; 4611 struct secasindex *saidx; 4612{ 4613 INIT_VNET_IPSEC(curvnet); 4614 u_int32_t newspi; 4615 u_int32_t min, max; 4616 int count = V_key_spi_trycnt; 4617 4618 /* set spi range to allocate */ 4619 if (spirange != NULL) { 4620 min = spirange->sadb_spirange_min; 4621 max = spirange->sadb_spirange_max; 4622 } else { 4623 min = V_key_spi_minval; 4624 max = V_key_spi_maxval; 4625 } 4626 /* IPCOMP needs 2-byte SPI */ 4627 if (saidx->proto == IPPROTO_IPCOMP) { 4628 u_int32_t t; 4629 if (min >= 0x10000) 4630 min = 0xffff; 4631 if (max >= 0x10000) 4632 max = 0xffff; 4633 if (min > max) { 4634 t = min; min = max; max = t; 4635 } 4636 } 4637 4638 if (min == max) { 4639 if (key_checkspidup(saidx, min) != NULL) { 4640 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4641 __func__, min)); 4642 return 0; 4643 } 4644 4645 count--; /* taking one cost. */ 4646 newspi = min; 4647 4648 } else { 4649 4650 /* init SPI */ 4651 newspi = 0; 4652 4653 /* when requesting to allocate spi ranged */ 4654 while (count--) { 4655 /* generate pseudo-random SPI value ranged. */ 4656 newspi = min + (key_random() % (max - min + 1)); 4657 4658 if (key_checkspidup(saidx, newspi) == NULL) 4659 break; 4660 } 4661 4662 if (count == 0 || newspi == 0) { 4663 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4664 __func__)); 4665 return 0; 4666 } 4667 } 4668 4669 /* statistics */ 4670 keystat.getspi_count = 4671 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4672 4673 return newspi; 4674} 4675 4676/* 4677 * SADB_UPDATE processing 4678 * receive 4679 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4680 * key(AE), (identity(SD),) (sensitivity)> 4681 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4682 * and send 4683 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4684 * (identity(SD),) (sensitivity)> 4685 * to the ikmpd. 4686 * 4687 * m will always be freed. 4688 */ 4689static int 4690key_update(so, m, mhp) 4691 struct socket *so; 4692 struct mbuf *m; 4693 const struct sadb_msghdr *mhp; 4694{ 4695 INIT_VNET_IPSEC(curvnet); 4696 struct sadb_sa *sa0; 4697 struct sadb_address *src0, *dst0; 4698 struct secasindex saidx; 4699 struct secashead *sah; 4700 struct secasvar *sav; 4701 u_int16_t proto; 4702 u_int8_t mode; 4703 u_int32_t reqid; 4704 int error; 4705 4706 IPSEC_ASSERT(so != NULL, ("null socket")); 4707 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4708 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4709 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4710 4711 /* map satype to proto */ 4712 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4713 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4714 __func__)); 4715 return key_senderror(so, m, EINVAL); 4716 } 4717 4718 if (mhp->ext[SADB_EXT_SA] == NULL || 4719 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4720 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4721 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4722 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4723 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4724 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4725 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4726 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4727 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4728 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4729 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4730 __func__)); 4731 return key_senderror(so, m, EINVAL); 4732 } 4733 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4734 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4735 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4736 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4737 __func__)); 4738 return key_senderror(so, m, EINVAL); 4739 } 4740 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4741 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4742 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4743 } else { 4744 mode = IPSEC_MODE_ANY; 4745 reqid = 0; 4746 } 4747 /* XXX boundary checking for other extensions */ 4748 4749 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4750 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4751 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4752 4753 /* XXX boundary check against sa_len */ 4754 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4755 4756 /* get a SA header */ 4757 if ((sah = key_getsah(&saidx)) == NULL) { 4758 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4759 return key_senderror(so, m, ENOENT); 4760 } 4761 4762 /* set spidx if there */ 4763 /* XXX rewrite */ 4764 error = key_setident(sah, m, mhp); 4765 if (error) 4766 return key_senderror(so, m, error); 4767 4768 /* find a SA with sequence number. */ 4769#ifdef IPSEC_DOSEQCHECK 4770 if (mhp->msg->sadb_msg_seq != 0 4771 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4772 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4773 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4774 return key_senderror(so, m, ENOENT); 4775 } 4776#else 4777 SAHTREE_LOCK(); 4778 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4779 SAHTREE_UNLOCK(); 4780 if (sav == NULL) { 4781 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4782 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4783 return key_senderror(so, m, EINVAL); 4784 } 4785#endif 4786 4787 /* validity check */ 4788 if (sav->sah->saidx.proto != proto) { 4789 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4790 "(DB=%u param=%u)\n", __func__, 4791 sav->sah->saidx.proto, proto)); 4792 return key_senderror(so, m, EINVAL); 4793 } 4794#ifdef IPSEC_DOSEQCHECK 4795 if (sav->spi != sa0->sadb_sa_spi) { 4796 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4797 __func__, 4798 (u_int32_t)ntohl(sav->spi), 4799 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4800 return key_senderror(so, m, EINVAL); 4801 } 4802#endif 4803 if (sav->pid != mhp->msg->sadb_msg_pid) { 4804 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4805 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4806 return key_senderror(so, m, EINVAL); 4807 } 4808 4809 /* copy sav values */ 4810 error = key_setsaval(sav, m, mhp); 4811 if (error) { 4812 KEY_FREESAV(&sav); 4813 return key_senderror(so, m, error); 4814 } 4815 4816 /* check SA values to be mature. */ 4817 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4818 KEY_FREESAV(&sav); 4819 return key_senderror(so, m, 0); 4820 } 4821 4822 { 4823 struct mbuf *n; 4824 4825 /* set msg buf from mhp */ 4826 n = key_getmsgbuf_x1(m, mhp); 4827 if (n == NULL) { 4828 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4829 return key_senderror(so, m, ENOBUFS); 4830 } 4831 4832 m_freem(m); 4833 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4834 } 4835} 4836 4837/* 4838 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4839 * only called by key_update(). 4840 * OUT: 4841 * NULL : not found 4842 * others : found, pointer to a SA. 4843 */ 4844#ifdef IPSEC_DOSEQCHECK 4845static struct secasvar * 4846key_getsavbyseq(sah, seq) 4847 struct secashead *sah; 4848 u_int32_t seq; 4849{ 4850 struct secasvar *sav; 4851 u_int state; 4852 4853 state = SADB_SASTATE_LARVAL; 4854 4855 /* search SAD with sequence number ? */ 4856 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4857 4858 KEY_CHKSASTATE(state, sav->state, __func__); 4859 4860 if (sav->seq == seq) { 4861 sa_addref(sav); 4862 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4863 printf("DP %s cause refcnt++:%d SA:%p\n", 4864 __func__, sav->refcnt, sav)); 4865 return sav; 4866 } 4867 } 4868 4869 return NULL; 4870} 4871#endif 4872 4873/* 4874 * SADB_ADD processing 4875 * add an entry to SA database, when received 4876 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4877 * key(AE), (identity(SD),) (sensitivity)> 4878 * from the ikmpd, 4879 * and send 4880 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4881 * (identity(SD),) (sensitivity)> 4882 * to the ikmpd. 4883 * 4884 * IGNORE identity and sensitivity messages. 4885 * 4886 * m will always be freed. 4887 */ 4888static int 4889key_add(so, m, mhp) 4890 struct socket *so; 4891 struct mbuf *m; 4892 const struct sadb_msghdr *mhp; 4893{ 4894 INIT_VNET_IPSEC(curvnet); 4895 struct sadb_sa *sa0; 4896 struct sadb_address *src0, *dst0; 4897 struct secasindex saidx; 4898 struct secashead *newsah; 4899 struct secasvar *newsav; 4900 u_int16_t proto; 4901 u_int8_t mode; 4902 u_int32_t reqid; 4903 int error; 4904 4905 IPSEC_ASSERT(so != NULL, ("null socket")); 4906 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4907 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4908 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4909 4910 /* map satype to proto */ 4911 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4912 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4913 __func__)); 4914 return key_senderror(so, m, EINVAL); 4915 } 4916 4917 if (mhp->ext[SADB_EXT_SA] == NULL || 4918 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4919 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4920 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4921 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4922 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4923 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4924 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4925 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4926 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4927 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4928 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4929 __func__)); 4930 return key_senderror(so, m, EINVAL); 4931 } 4932 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4933 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4934 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4935 /* XXX need more */ 4936 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4937 __func__)); 4938 return key_senderror(so, m, EINVAL); 4939 } 4940 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4941 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4942 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4943 } else { 4944 mode = IPSEC_MODE_ANY; 4945 reqid = 0; 4946 } 4947 4948 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4949 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4950 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4951 4952 /* XXX boundary check against sa_len */ 4953 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4954 4955 /* get a SA header */ 4956 if ((newsah = key_getsah(&saidx)) == NULL) { 4957 /* create a new SA header */ 4958 if ((newsah = key_newsah(&saidx)) == NULL) { 4959 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4960 return key_senderror(so, m, ENOBUFS); 4961 } 4962 } 4963 4964 /* set spidx if there */ 4965 /* XXX rewrite */ 4966 error = key_setident(newsah, m, mhp); 4967 if (error) { 4968 return key_senderror(so, m, error); 4969 } 4970 4971 /* create new SA entry. */ 4972 /* We can create new SA only if SPI is differenct. */ 4973 SAHTREE_LOCK(); 4974 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4975 SAHTREE_UNLOCK(); 4976 if (newsav != NULL) { 4977 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4978 return key_senderror(so, m, EEXIST); 4979 } 4980 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4981 if (newsav == NULL) { 4982 return key_senderror(so, m, error); 4983 } 4984 4985 /* check SA values to be mature. */ 4986 if ((error = key_mature(newsav)) != 0) { 4987 KEY_FREESAV(&newsav); 4988 return key_senderror(so, m, error); 4989 } 4990 4991 /* 4992 * don't call key_freesav() here, as we would like to keep the SA 4993 * in the database on success. 4994 */ 4995 4996 { 4997 struct mbuf *n; 4998 4999 /* set msg buf from mhp */ 5000 n = key_getmsgbuf_x1(m, mhp); 5001 if (n == NULL) { 5002 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5003 return key_senderror(so, m, ENOBUFS); 5004 } 5005 5006 m_freem(m); 5007 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5008 } 5009} 5010 5011/* m is retained */ 5012static int 5013key_setident(sah, m, mhp) 5014 struct secashead *sah; 5015 struct mbuf *m; 5016 const struct sadb_msghdr *mhp; 5017{ 5018 INIT_VNET_IPSEC(curvnet); 5019 const struct sadb_ident *idsrc, *iddst; 5020 int idsrclen, iddstlen; 5021 5022 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5023 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5024 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5025 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5026 5027 /* don't make buffer if not there */ 5028 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5029 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5030 sah->idents = NULL; 5031 sah->identd = NULL; 5032 return 0; 5033 } 5034 5035 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5036 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5037 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5038 return EINVAL; 5039 } 5040 5041 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5042 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5043 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5044 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5045 5046 /* validity check */ 5047 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5048 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5049 return EINVAL; 5050 } 5051 5052 switch (idsrc->sadb_ident_type) { 5053 case SADB_IDENTTYPE_PREFIX: 5054 case SADB_IDENTTYPE_FQDN: 5055 case SADB_IDENTTYPE_USERFQDN: 5056 default: 5057 /* XXX do nothing */ 5058 sah->idents = NULL; 5059 sah->identd = NULL; 5060 return 0; 5061 } 5062 5063 /* make structure */ 5064 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5065 if (sah->idents == NULL) { 5066 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5067 return ENOBUFS; 5068 } 5069 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5070 if (sah->identd == NULL) { 5071 free(sah->idents, M_IPSEC_MISC); 5072 sah->idents = NULL; 5073 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5074 return ENOBUFS; 5075 } 5076 sah->idents->type = idsrc->sadb_ident_type; 5077 sah->idents->id = idsrc->sadb_ident_id; 5078 5079 sah->identd->type = iddst->sadb_ident_type; 5080 sah->identd->id = iddst->sadb_ident_id; 5081 5082 return 0; 5083} 5084 5085/* 5086 * m will not be freed on return. 5087 * it is caller's responsibility to free the result. 5088 */ 5089static struct mbuf * 5090key_getmsgbuf_x1(m, mhp) 5091 struct mbuf *m; 5092 const struct sadb_msghdr *mhp; 5093{ 5094 struct mbuf *n; 5095 5096 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5097 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5098 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5099 5100 /* create new sadb_msg to reply. */ 5101 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5102 SADB_EXT_SA, SADB_X_EXT_SA2, 5103 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5104 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5105 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5106 if (!n) 5107 return NULL; 5108 5109 if (n->m_len < sizeof(struct sadb_msg)) { 5110 n = m_pullup(n, sizeof(struct sadb_msg)); 5111 if (n == NULL) 5112 return NULL; 5113 } 5114 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5115 mtod(n, struct sadb_msg *)->sadb_msg_len = 5116 PFKEY_UNIT64(n->m_pkthdr.len); 5117 5118 return n; 5119} 5120 5121static int key_delete_all __P((struct socket *, struct mbuf *, 5122 const struct sadb_msghdr *, u_int16_t)); 5123 5124/* 5125 * SADB_DELETE processing 5126 * receive 5127 * <base, SA(*), address(SD)> 5128 * from the ikmpd, and set SADB_SASTATE_DEAD, 5129 * and send, 5130 * <base, SA(*), address(SD)> 5131 * to the ikmpd. 5132 * 5133 * m will always be freed. 5134 */ 5135static int 5136key_delete(so, m, mhp) 5137 struct socket *so; 5138 struct mbuf *m; 5139 const struct sadb_msghdr *mhp; 5140{ 5141 INIT_VNET_IPSEC(curvnet); 5142 struct sadb_sa *sa0; 5143 struct sadb_address *src0, *dst0; 5144 struct secasindex saidx; 5145 struct secashead *sah; 5146 struct secasvar *sav = NULL; 5147 u_int16_t proto; 5148 5149 IPSEC_ASSERT(so != NULL, ("null socket")); 5150 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5151 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5152 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5153 5154 /* map satype to proto */ 5155 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5156 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5157 __func__)); 5158 return key_senderror(so, m, EINVAL); 5159 } 5160 5161 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5162 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5163 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5164 __func__)); 5165 return key_senderror(so, m, EINVAL); 5166 } 5167 5168 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5169 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5170 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5171 __func__)); 5172 return key_senderror(so, m, EINVAL); 5173 } 5174 5175 if (mhp->ext[SADB_EXT_SA] == NULL) { 5176 /* 5177 * Caller wants us to delete all non-LARVAL SAs 5178 * that match the src/dst. This is used during 5179 * IKE INITIAL-CONTACT. 5180 */ 5181 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5182 return key_delete_all(so, m, mhp, proto); 5183 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5184 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5185 __func__)); 5186 return key_senderror(so, m, EINVAL); 5187 } 5188 5189 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5190 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5191 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5192 5193 /* XXX boundary check against sa_len */ 5194 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5195 5196 /* get a SA header */ 5197 SAHTREE_LOCK(); 5198 LIST_FOREACH(sah, &V_sahtree, chain) { 5199 if (sah->state == SADB_SASTATE_DEAD) 5200 continue; 5201 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5202 continue; 5203 5204 /* get a SA with SPI. */ 5205 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5206 if (sav) 5207 break; 5208 } 5209 if (sah == NULL) { 5210 SAHTREE_UNLOCK(); 5211 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5212 return key_senderror(so, m, ENOENT); 5213 } 5214 5215 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5216 SAHTREE_UNLOCK(); 5217 KEY_FREESAV(&sav); 5218 5219 { 5220 struct mbuf *n; 5221 struct sadb_msg *newmsg; 5222 5223 /* create new sadb_msg to reply. */ 5224 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5225 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5226 if (!n) 5227 return key_senderror(so, m, ENOBUFS); 5228 5229 if (n->m_len < sizeof(struct sadb_msg)) { 5230 n = m_pullup(n, sizeof(struct sadb_msg)); 5231 if (n == NULL) 5232 return key_senderror(so, m, ENOBUFS); 5233 } 5234 newmsg = mtod(n, struct sadb_msg *); 5235 newmsg->sadb_msg_errno = 0; 5236 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5237 5238 m_freem(m); 5239 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5240 } 5241} 5242 5243/* 5244 * delete all SAs for src/dst. Called from key_delete(). 5245 */ 5246static int 5247key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5248 u_int16_t proto) 5249{ 5250 INIT_VNET_IPSEC(curvnet); 5251 struct sadb_address *src0, *dst0; 5252 struct secasindex saidx; 5253 struct secashead *sah; 5254 struct secasvar *sav, *nextsav; 5255 u_int stateidx, state; 5256 5257 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5258 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5259 5260 /* XXX boundary check against sa_len */ 5261 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5262 5263 SAHTREE_LOCK(); 5264 LIST_FOREACH(sah, &V_sahtree, chain) { 5265 if (sah->state == SADB_SASTATE_DEAD) 5266 continue; 5267 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5268 continue; 5269 5270 /* Delete all non-LARVAL SAs. */ 5271 for (stateidx = 0; 5272 stateidx < _ARRAYLEN(saorder_state_alive); 5273 stateidx++) { 5274 state = saorder_state_alive[stateidx]; 5275 if (state == SADB_SASTATE_LARVAL) 5276 continue; 5277 for (sav = LIST_FIRST(&sah->savtree[state]); 5278 sav != NULL; sav = nextsav) { 5279 nextsav = LIST_NEXT(sav, chain); 5280 /* sanity check */ 5281 if (sav->state != state) { 5282 ipseclog((LOG_DEBUG, "%s: invalid " 5283 "sav->state (queue %d SA %d)\n", 5284 __func__, state, sav->state)); 5285 continue; 5286 } 5287 5288 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5289 KEY_FREESAV(&sav); 5290 } 5291 } 5292 } 5293 SAHTREE_UNLOCK(); 5294 { 5295 struct mbuf *n; 5296 struct sadb_msg *newmsg; 5297 5298 /* create new sadb_msg to reply. */ 5299 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5300 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5301 if (!n) 5302 return key_senderror(so, m, ENOBUFS); 5303 5304 if (n->m_len < sizeof(struct sadb_msg)) { 5305 n = m_pullup(n, sizeof(struct sadb_msg)); 5306 if (n == NULL) 5307 return key_senderror(so, m, ENOBUFS); 5308 } 5309 newmsg = mtod(n, struct sadb_msg *); 5310 newmsg->sadb_msg_errno = 0; 5311 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5312 5313 m_freem(m); 5314 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5315 } 5316} 5317 5318/* 5319 * SADB_GET processing 5320 * receive 5321 * <base, SA(*), address(SD)> 5322 * from the ikmpd, and get a SP and a SA to respond, 5323 * and send, 5324 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5325 * (identity(SD),) (sensitivity)> 5326 * to the ikmpd. 5327 * 5328 * m will always be freed. 5329 */ 5330static int 5331key_get(so, m, mhp) 5332 struct socket *so; 5333 struct mbuf *m; 5334 const struct sadb_msghdr *mhp; 5335{ 5336 INIT_VNET_IPSEC(curvnet); 5337 struct sadb_sa *sa0; 5338 struct sadb_address *src0, *dst0; 5339 struct secasindex saidx; 5340 struct secashead *sah; 5341 struct secasvar *sav = NULL; 5342 u_int16_t proto; 5343 5344 IPSEC_ASSERT(so != NULL, ("null socket")); 5345 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5346 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5347 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5348 5349 /* map satype to proto */ 5350 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5351 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5352 __func__)); 5353 return key_senderror(so, m, EINVAL); 5354 } 5355 5356 if (mhp->ext[SADB_EXT_SA] == NULL || 5357 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5358 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5359 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5360 __func__)); 5361 return key_senderror(so, m, EINVAL); 5362 } 5363 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5364 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5365 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5366 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5367 __func__)); 5368 return key_senderror(so, m, EINVAL); 5369 } 5370 5371 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5372 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5373 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5374 5375 /* XXX boundary check against sa_len */ 5376 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5377 5378 /* get a SA header */ 5379 SAHTREE_LOCK(); 5380 LIST_FOREACH(sah, &V_sahtree, chain) { 5381 if (sah->state == SADB_SASTATE_DEAD) 5382 continue; 5383 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5384 continue; 5385 5386 /* get a SA with SPI. */ 5387 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5388 if (sav) 5389 break; 5390 } 5391 SAHTREE_UNLOCK(); 5392 if (sah == NULL) { 5393 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5394 return key_senderror(so, m, ENOENT); 5395 } 5396 5397 { 5398 struct mbuf *n; 5399 u_int8_t satype; 5400 5401 /* map proto to satype */ 5402 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5403 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5404 __func__)); 5405 return key_senderror(so, m, EINVAL); 5406 } 5407 5408 /* create new sadb_msg to reply. */ 5409 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5410 mhp->msg->sadb_msg_pid); 5411 if (!n) 5412 return key_senderror(so, m, ENOBUFS); 5413 5414 m_freem(m); 5415 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5416 } 5417} 5418 5419/* XXX make it sysctl-configurable? */ 5420static void 5421key_getcomb_setlifetime(comb) 5422 struct sadb_comb *comb; 5423{ 5424 5425 comb->sadb_comb_soft_allocations = 1; 5426 comb->sadb_comb_hard_allocations = 1; 5427 comb->sadb_comb_soft_bytes = 0; 5428 comb->sadb_comb_hard_bytes = 0; 5429 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5430 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5431 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5432 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5433} 5434 5435/* 5436 * XXX reorder combinations by preference 5437 * XXX no idea if the user wants ESP authentication or not 5438 */ 5439static struct mbuf * 5440key_getcomb_esp() 5441{ 5442 INIT_VNET_IPSEC(curvnet); 5443 struct sadb_comb *comb; 5444 struct enc_xform *algo; 5445 struct mbuf *result = NULL, *m, *n; 5446 int encmin; 5447 int i, off, o; 5448 int totlen; 5449 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5450 5451 m = NULL; 5452 for (i = 1; i <= SADB_EALG_MAX; i++) { 5453 algo = esp_algorithm_lookup(i); 5454 if (algo == NULL) 5455 continue; 5456 5457 /* discard algorithms with key size smaller than system min */ 5458 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5459 continue; 5460 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5461 encmin = V_ipsec_esp_keymin; 5462 else 5463 encmin = _BITS(algo->minkey); 5464 5465 if (V_ipsec_esp_auth) 5466 m = key_getcomb_ah(); 5467 else { 5468 IPSEC_ASSERT(l <= MLEN, 5469 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5470 MGET(m, M_DONTWAIT, MT_DATA); 5471 if (m) { 5472 M_ALIGN(m, l); 5473 m->m_len = l; 5474 m->m_next = NULL; 5475 bzero(mtod(m, caddr_t), m->m_len); 5476 } 5477 } 5478 if (!m) 5479 goto fail; 5480 5481 totlen = 0; 5482 for (n = m; n; n = n->m_next) 5483 totlen += n->m_len; 5484 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5485 5486 for (off = 0; off < totlen; off += l) { 5487 n = m_pulldown(m, off, l, &o); 5488 if (!n) { 5489 /* m is already freed */ 5490 goto fail; 5491 } 5492 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5493 bzero(comb, sizeof(*comb)); 5494 key_getcomb_setlifetime(comb); 5495 comb->sadb_comb_encrypt = i; 5496 comb->sadb_comb_encrypt_minbits = encmin; 5497 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5498 } 5499 5500 if (!result) 5501 result = m; 5502 else 5503 m_cat(result, m); 5504 } 5505 5506 return result; 5507 5508 fail: 5509 if (result) 5510 m_freem(result); 5511 return NULL; 5512} 5513 5514static void 5515key_getsizes_ah( 5516 const struct auth_hash *ah, 5517 int alg, 5518 u_int16_t* min, 5519 u_int16_t* max) 5520{ 5521 INIT_VNET_IPSEC(curvnet); 5522 5523 *min = *max = ah->keysize; 5524 if (ah->keysize == 0) { 5525 /* 5526 * Transform takes arbitrary key size but algorithm 5527 * key size is restricted. Enforce this here. 5528 */ 5529 switch (alg) { 5530 case SADB_X_AALG_MD5: *min = *max = 16; break; 5531 case SADB_X_AALG_SHA: *min = *max = 20; break; 5532 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5533 default: 5534 DPRINTF(("%s: unknown AH algorithm %u\n", 5535 __func__, alg)); 5536 break; 5537 } 5538 } 5539} 5540 5541/* 5542 * XXX reorder combinations by preference 5543 */ 5544static struct mbuf * 5545key_getcomb_ah() 5546{ 5547 INIT_VNET_IPSEC(curvnet); 5548 struct sadb_comb *comb; 5549 struct auth_hash *algo; 5550 struct mbuf *m; 5551 u_int16_t minkeysize, maxkeysize; 5552 int i; 5553 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5554 5555 m = NULL; 5556 for (i = 1; i <= SADB_AALG_MAX; i++) { 5557#if 1 5558 /* we prefer HMAC algorithms, not old algorithms */ 5559 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5560 continue; 5561#endif 5562 algo = ah_algorithm_lookup(i); 5563 if (!algo) 5564 continue; 5565 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5566 /* discard algorithms with key size smaller than system min */ 5567 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5568 continue; 5569 5570 if (!m) { 5571 IPSEC_ASSERT(l <= MLEN, 5572 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5573 MGET(m, M_DONTWAIT, MT_DATA); 5574 if (m) { 5575 M_ALIGN(m, l); 5576 m->m_len = l; 5577 m->m_next = NULL; 5578 } 5579 } else 5580 M_PREPEND(m, l, M_DONTWAIT); 5581 if (!m) 5582 return NULL; 5583 5584 comb = mtod(m, struct sadb_comb *); 5585 bzero(comb, sizeof(*comb)); 5586 key_getcomb_setlifetime(comb); 5587 comb->sadb_comb_auth = i; 5588 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5589 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5590 } 5591 5592 return m; 5593} 5594 5595/* 5596 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5597 * XXX reorder combinations by preference 5598 */ 5599static struct mbuf * 5600key_getcomb_ipcomp() 5601{ 5602 struct sadb_comb *comb; 5603 struct comp_algo *algo; 5604 struct mbuf *m; 5605 int i; 5606 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5607 5608 m = NULL; 5609 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5610 algo = ipcomp_algorithm_lookup(i); 5611 if (!algo) 5612 continue; 5613 5614 if (!m) { 5615 IPSEC_ASSERT(l <= MLEN, 5616 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5617 MGET(m, M_DONTWAIT, MT_DATA); 5618 if (m) { 5619 M_ALIGN(m, l); 5620 m->m_len = l; 5621 m->m_next = NULL; 5622 } 5623 } else 5624 M_PREPEND(m, l, M_DONTWAIT); 5625 if (!m) 5626 return NULL; 5627 5628 comb = mtod(m, struct sadb_comb *); 5629 bzero(comb, sizeof(*comb)); 5630 key_getcomb_setlifetime(comb); 5631 comb->sadb_comb_encrypt = i; 5632 /* what should we set into sadb_comb_*_{min,max}bits? */ 5633 } 5634 5635 return m; 5636} 5637 5638/* 5639 * XXX no way to pass mode (transport/tunnel) to userland 5640 * XXX replay checking? 5641 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5642 */ 5643static struct mbuf * 5644key_getprop(saidx) 5645 const struct secasindex *saidx; 5646{ 5647 struct sadb_prop *prop; 5648 struct mbuf *m, *n; 5649 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5650 int totlen; 5651 5652 switch (saidx->proto) { 5653 case IPPROTO_ESP: 5654 m = key_getcomb_esp(); 5655 break; 5656 case IPPROTO_AH: 5657 m = key_getcomb_ah(); 5658 break; 5659 case IPPROTO_IPCOMP: 5660 m = key_getcomb_ipcomp(); 5661 break; 5662 default: 5663 return NULL; 5664 } 5665 5666 if (!m) 5667 return NULL; 5668 M_PREPEND(m, l, M_DONTWAIT); 5669 if (!m) 5670 return NULL; 5671 5672 totlen = 0; 5673 for (n = m; n; n = n->m_next) 5674 totlen += n->m_len; 5675 5676 prop = mtod(m, struct sadb_prop *); 5677 bzero(prop, sizeof(*prop)); 5678 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5679 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5680 prop->sadb_prop_replay = 32; /* XXX */ 5681 5682 return m; 5683} 5684 5685/* 5686 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5687 * send 5688 * <base, SA, address(SD), (address(P)), x_policy, 5689 * (identity(SD),) (sensitivity,) proposal> 5690 * to KMD, and expect to receive 5691 * <base> with SADB_ACQUIRE if error occured, 5692 * or 5693 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5694 * from KMD by PF_KEY. 5695 * 5696 * XXX x_policy is outside of RFC2367 (KAME extension). 5697 * XXX sensitivity is not supported. 5698 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5699 * see comment for key_getcomb_ipcomp(). 5700 * 5701 * OUT: 5702 * 0 : succeed 5703 * others: error number 5704 */ 5705static int 5706key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5707{ 5708 INIT_VNET_IPSEC(curvnet); 5709 struct mbuf *result = NULL, *m; 5710 struct secacq *newacq; 5711 u_int8_t satype; 5712 int error = -1; 5713 u_int32_t seq; 5714 5715 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5716 satype = key_proto2satype(saidx->proto); 5717 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5718 5719 /* 5720 * We never do anything about acquirng SA. There is anather 5721 * solution that kernel blocks to send SADB_ACQUIRE message until 5722 * getting something message from IKEd. In later case, to be 5723 * managed with ACQUIRING list. 5724 */ 5725 /* Get an entry to check whether sending message or not. */ 5726 if ((newacq = key_getacq(saidx)) != NULL) { 5727 if (V_key_blockacq_count < newacq->count) { 5728 /* reset counter and do send message. */ 5729 newacq->count = 0; 5730 } else { 5731 /* increment counter and do nothing. */ 5732 newacq->count++; 5733 return 0; 5734 } 5735 } else { 5736 /* make new entry for blocking to send SADB_ACQUIRE. */ 5737 if ((newacq = key_newacq(saidx)) == NULL) 5738 return ENOBUFS; 5739 } 5740 5741 5742 seq = newacq->seq; 5743 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5744 if (!m) { 5745 error = ENOBUFS; 5746 goto fail; 5747 } 5748 result = m; 5749 5750 /* set sadb_address for saidx's. */ 5751 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5752 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5753 if (!m) { 5754 error = ENOBUFS; 5755 goto fail; 5756 } 5757 m_cat(result, m); 5758 5759 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5760 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5761 if (!m) { 5762 error = ENOBUFS; 5763 goto fail; 5764 } 5765 m_cat(result, m); 5766 5767 /* XXX proxy address (optional) */ 5768 5769 /* set sadb_x_policy */ 5770 if (sp) { 5771 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5772 if (!m) { 5773 error = ENOBUFS; 5774 goto fail; 5775 } 5776 m_cat(result, m); 5777 } 5778 5779 /* XXX identity (optional) */ 5780#if 0 5781 if (idexttype && fqdn) { 5782 /* create identity extension (FQDN) */ 5783 struct sadb_ident *id; 5784 int fqdnlen; 5785 5786 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5787 id = (struct sadb_ident *)p; 5788 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5789 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5790 id->sadb_ident_exttype = idexttype; 5791 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5792 bcopy(fqdn, id + 1, fqdnlen); 5793 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5794 } 5795 5796 if (idexttype) { 5797 /* create identity extension (USERFQDN) */ 5798 struct sadb_ident *id; 5799 int userfqdnlen; 5800 5801 if (userfqdn) { 5802 /* +1 for terminating-NUL */ 5803 userfqdnlen = strlen(userfqdn) + 1; 5804 } else 5805 userfqdnlen = 0; 5806 id = (struct sadb_ident *)p; 5807 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5808 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5809 id->sadb_ident_exttype = idexttype; 5810 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5811 /* XXX is it correct? */ 5812 if (curproc && curproc->p_cred) 5813 id->sadb_ident_id = curproc->p_cred->p_ruid; 5814 if (userfqdn && userfqdnlen) 5815 bcopy(userfqdn, id + 1, userfqdnlen); 5816 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5817 } 5818#endif 5819 5820 /* XXX sensitivity (optional) */ 5821 5822 /* create proposal/combination extension */ 5823 m = key_getprop(saidx); 5824#if 0 5825 /* 5826 * spec conformant: always attach proposal/combination extension, 5827 * the problem is that we have no way to attach it for ipcomp, 5828 * due to the way sadb_comb is declared in RFC2367. 5829 */ 5830 if (!m) { 5831 error = ENOBUFS; 5832 goto fail; 5833 } 5834 m_cat(result, m); 5835#else 5836 /* 5837 * outside of spec; make proposal/combination extension optional. 5838 */ 5839 if (m) 5840 m_cat(result, m); 5841#endif 5842 5843 if ((result->m_flags & M_PKTHDR) == 0) { 5844 error = EINVAL; 5845 goto fail; 5846 } 5847 5848 if (result->m_len < sizeof(struct sadb_msg)) { 5849 result = m_pullup(result, sizeof(struct sadb_msg)); 5850 if (result == NULL) { 5851 error = ENOBUFS; 5852 goto fail; 5853 } 5854 } 5855 5856 result->m_pkthdr.len = 0; 5857 for (m = result; m; m = m->m_next) 5858 result->m_pkthdr.len += m->m_len; 5859 5860 mtod(result, struct sadb_msg *)->sadb_msg_len = 5861 PFKEY_UNIT64(result->m_pkthdr.len); 5862 5863 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5864 5865 fail: 5866 if (result) 5867 m_freem(result); 5868 return error; 5869} 5870 5871static struct secacq * 5872key_newacq(const struct secasindex *saidx) 5873{ 5874 INIT_VNET_IPSEC(curvnet); 5875 struct secacq *newacq; 5876 5877 /* get new entry */ 5878 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5879 if (newacq == NULL) { 5880 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5881 return NULL; 5882 } 5883 5884 /* copy secindex */ 5885 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5886 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5887 newacq->created = time_second; 5888 newacq->count = 0; 5889 5890 /* add to acqtree */ 5891 ACQ_LOCK(); 5892 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5893 ACQ_UNLOCK(); 5894 5895 return newacq; 5896} 5897 5898static struct secacq * 5899key_getacq(const struct secasindex *saidx) 5900{ 5901 INIT_VNET_IPSEC(curvnet); 5902 struct secacq *acq; 5903 5904 ACQ_LOCK(); 5905 LIST_FOREACH(acq, &V_acqtree, chain) { 5906 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5907 break; 5908 } 5909 ACQ_UNLOCK(); 5910 5911 return acq; 5912} 5913 5914static struct secacq * 5915key_getacqbyseq(seq) 5916 u_int32_t seq; 5917{ 5918 INIT_VNET_IPSEC(curvnet); 5919 struct secacq *acq; 5920 5921 ACQ_LOCK(); 5922 LIST_FOREACH(acq, &V_acqtree, chain) { 5923 if (acq->seq == seq) 5924 break; 5925 } 5926 ACQ_UNLOCK(); 5927 5928 return acq; 5929} 5930 5931static struct secspacq * 5932key_newspacq(spidx) 5933 struct secpolicyindex *spidx; 5934{ 5935 INIT_VNET_IPSEC(curvnet); 5936 struct secspacq *acq; 5937 5938 /* get new entry */ 5939 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5940 if (acq == NULL) { 5941 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5942 return NULL; 5943 } 5944 5945 /* copy secindex */ 5946 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5947 acq->created = time_second; 5948 acq->count = 0; 5949 5950 /* add to spacqtree */ 5951 SPACQ_LOCK(); 5952 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5953 SPACQ_UNLOCK(); 5954 5955 return acq; 5956} 5957 5958static struct secspacq * 5959key_getspacq(spidx) 5960 struct secpolicyindex *spidx; 5961{ 5962 INIT_VNET_IPSEC(curvnet); 5963 struct secspacq *acq; 5964 5965 SPACQ_LOCK(); 5966 LIST_FOREACH(acq, &V_spacqtree, chain) { 5967 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5968 /* NB: return holding spacq_lock */ 5969 return acq; 5970 } 5971 } 5972 SPACQ_UNLOCK(); 5973 5974 return NULL; 5975} 5976 5977/* 5978 * SADB_ACQUIRE processing, 5979 * in first situation, is receiving 5980 * <base> 5981 * from the ikmpd, and clear sequence of its secasvar entry. 5982 * 5983 * In second situation, is receiving 5984 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5985 * from a user land process, and return 5986 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5987 * to the socket. 5988 * 5989 * m will always be freed. 5990 */ 5991static int 5992key_acquire2(so, m, mhp) 5993 struct socket *so; 5994 struct mbuf *m; 5995 const struct sadb_msghdr *mhp; 5996{ 5997 INIT_VNET_IPSEC(curvnet); 5998 const struct sadb_address *src0, *dst0; 5999 struct secasindex saidx; 6000 struct secashead *sah; 6001 u_int16_t proto; 6002 int error; 6003 6004 IPSEC_ASSERT(so != NULL, ("null socket")); 6005 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6006 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6007 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6008 6009 /* 6010 * Error message from KMd. 6011 * We assume that if error was occured in IKEd, the length of PFKEY 6012 * message is equal to the size of sadb_msg structure. 6013 * We do not raise error even if error occured in this function. 6014 */ 6015 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6016 struct secacq *acq; 6017 6018 /* check sequence number */ 6019 if (mhp->msg->sadb_msg_seq == 0) { 6020 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6021 "number.\n", __func__)); 6022 m_freem(m); 6023 return 0; 6024 } 6025 6026 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6027 /* 6028 * the specified larval SA is already gone, or we got 6029 * a bogus sequence number. we can silently ignore it. 6030 */ 6031 m_freem(m); 6032 return 0; 6033 } 6034 6035 /* reset acq counter in order to deletion by timehander. */ 6036 acq->created = time_second; 6037 acq->count = 0; 6038 m_freem(m); 6039 return 0; 6040 } 6041 6042 /* 6043 * This message is from user land. 6044 */ 6045 6046 /* map satype to proto */ 6047 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6048 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6049 __func__)); 6050 return key_senderror(so, m, EINVAL); 6051 } 6052 6053 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6054 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6055 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6056 /* error */ 6057 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6058 __func__)); 6059 return key_senderror(so, m, EINVAL); 6060 } 6061 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6062 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6063 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6064 /* error */ 6065 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6066 __func__)); 6067 return key_senderror(so, m, EINVAL); 6068 } 6069 6070 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6071 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6072 6073 /* XXX boundary check against sa_len */ 6074 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6075 6076 /* get a SA index */ 6077 SAHTREE_LOCK(); 6078 LIST_FOREACH(sah, &V_sahtree, chain) { 6079 if (sah->state == SADB_SASTATE_DEAD) 6080 continue; 6081 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6082 break; 6083 } 6084 SAHTREE_UNLOCK(); 6085 if (sah != NULL) { 6086 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6087 return key_senderror(so, m, EEXIST); 6088 } 6089 6090 error = key_acquire(&saidx, NULL); 6091 if (error != 0) { 6092 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6093 __func__, mhp->msg->sadb_msg_errno)); 6094 return key_senderror(so, m, error); 6095 } 6096 6097 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6098} 6099 6100/* 6101 * SADB_REGISTER processing. 6102 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6103 * receive 6104 * <base> 6105 * from the ikmpd, and register a socket to send PF_KEY messages, 6106 * and send 6107 * <base, supported> 6108 * to KMD by PF_KEY. 6109 * If socket is detached, must free from regnode. 6110 * 6111 * m will always be freed. 6112 */ 6113static int 6114key_register(so, m, mhp) 6115 struct socket *so; 6116 struct mbuf *m; 6117 const struct sadb_msghdr *mhp; 6118{ 6119 INIT_VNET_IPSEC(curvnet); 6120 struct secreg *reg, *newreg = 0; 6121 6122 IPSEC_ASSERT(so != NULL, ("null socket")); 6123 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6124 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6125 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6126 6127 /* check for invalid register message */ 6128 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6129 return key_senderror(so, m, EINVAL); 6130 6131 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6132 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6133 goto setmsg; 6134 6135 /* check whether existing or not */ 6136 REGTREE_LOCK(); 6137 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6138 if (reg->so == so) { 6139 REGTREE_UNLOCK(); 6140 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6141 __func__)); 6142 return key_senderror(so, m, EEXIST); 6143 } 6144 } 6145 6146 /* create regnode */ 6147 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6148 if (newreg == NULL) { 6149 REGTREE_UNLOCK(); 6150 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6151 return key_senderror(so, m, ENOBUFS); 6152 } 6153 6154 newreg->so = so; 6155 ((struct keycb *)sotorawcb(so))->kp_registered++; 6156 6157 /* add regnode to regtree. */ 6158 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6159 REGTREE_UNLOCK(); 6160 6161 setmsg: 6162 { 6163 struct mbuf *n; 6164 struct sadb_msg *newmsg; 6165 struct sadb_supported *sup; 6166 u_int len, alen, elen; 6167 int off; 6168 int i; 6169 struct sadb_alg *alg; 6170 6171 /* create new sadb_msg to reply. */ 6172 alen = 0; 6173 for (i = 1; i <= SADB_AALG_MAX; i++) { 6174 if (ah_algorithm_lookup(i)) 6175 alen += sizeof(struct sadb_alg); 6176 } 6177 if (alen) 6178 alen += sizeof(struct sadb_supported); 6179 elen = 0; 6180 for (i = 1; i <= SADB_EALG_MAX; i++) { 6181 if (esp_algorithm_lookup(i)) 6182 elen += sizeof(struct sadb_alg); 6183 } 6184 if (elen) 6185 elen += sizeof(struct sadb_supported); 6186 6187 len = sizeof(struct sadb_msg) + alen + elen; 6188 6189 if (len > MCLBYTES) 6190 return key_senderror(so, m, ENOBUFS); 6191 6192 MGETHDR(n, M_DONTWAIT, MT_DATA); 6193 if (len > MHLEN) { 6194 MCLGET(n, M_DONTWAIT); 6195 if ((n->m_flags & M_EXT) == 0) { 6196 m_freem(n); 6197 n = NULL; 6198 } 6199 } 6200 if (!n) 6201 return key_senderror(so, m, ENOBUFS); 6202 6203 n->m_pkthdr.len = n->m_len = len; 6204 n->m_next = NULL; 6205 off = 0; 6206 6207 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6208 newmsg = mtod(n, struct sadb_msg *); 6209 newmsg->sadb_msg_errno = 0; 6210 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6211 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6212 6213 /* for authentication algorithm */ 6214 if (alen) { 6215 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6216 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6217 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6218 off += PFKEY_ALIGN8(sizeof(*sup)); 6219 6220 for (i = 1; i <= SADB_AALG_MAX; i++) { 6221 struct auth_hash *aalgo; 6222 u_int16_t minkeysize, maxkeysize; 6223 6224 aalgo = ah_algorithm_lookup(i); 6225 if (!aalgo) 6226 continue; 6227 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6228 alg->sadb_alg_id = i; 6229 alg->sadb_alg_ivlen = 0; 6230 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6231 alg->sadb_alg_minbits = _BITS(minkeysize); 6232 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6233 off += PFKEY_ALIGN8(sizeof(*alg)); 6234 } 6235 } 6236 6237 /* for encryption algorithm */ 6238 if (elen) { 6239 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6240 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6241 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6242 off += PFKEY_ALIGN8(sizeof(*sup)); 6243 6244 for (i = 1; i <= SADB_EALG_MAX; i++) { 6245 struct enc_xform *ealgo; 6246 6247 ealgo = esp_algorithm_lookup(i); 6248 if (!ealgo) 6249 continue; 6250 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6251 alg->sadb_alg_id = i; 6252 alg->sadb_alg_ivlen = ealgo->blocksize; 6253 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6254 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6255 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6256 } 6257 } 6258 6259 IPSEC_ASSERT(off == len, 6260 ("length assumption failed (off %u len %u)", off, len)); 6261 6262 m_freem(m); 6263 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6264 } 6265} 6266 6267/* 6268 * free secreg entry registered. 6269 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6270 */ 6271void 6272key_freereg(struct socket *so) 6273{ 6274 INIT_VNET_IPSEC(curvnet); 6275 struct secreg *reg; 6276 int i; 6277 6278 IPSEC_ASSERT(so != NULL, ("NULL so")); 6279 6280 /* 6281 * check whether existing or not. 6282 * check all type of SA, because there is a potential that 6283 * one socket is registered to multiple type of SA. 6284 */ 6285 REGTREE_LOCK(); 6286 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6287 LIST_FOREACH(reg, &V_regtree[i], chain) { 6288 if (reg->so == so && __LIST_CHAINED(reg)) { 6289 LIST_REMOVE(reg, chain); 6290 free(reg, M_IPSEC_SAR); 6291 break; 6292 } 6293 } 6294 } 6295 REGTREE_UNLOCK(); 6296} 6297 6298/* 6299 * SADB_EXPIRE processing 6300 * send 6301 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6302 * to KMD by PF_KEY. 6303 * NOTE: We send only soft lifetime extension. 6304 * 6305 * OUT: 0 : succeed 6306 * others : error number 6307 */ 6308static int 6309key_expire(struct secasvar *sav) 6310{ 6311 int s; 6312 int satype; 6313 struct mbuf *result = NULL, *m; 6314 int len; 6315 int error = -1; 6316 struct sadb_lifetime *lt; 6317 6318 /* XXX: Why do we lock ? */ 6319 s = splnet(); /*called from softclock()*/ 6320 6321 IPSEC_ASSERT (sav != NULL, ("null sav")); 6322 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6323 6324 /* set msg header */ 6325 satype = key_proto2satype(sav->sah->saidx.proto); 6326 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6327 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6328 if (!m) { 6329 error = ENOBUFS; 6330 goto fail; 6331 } 6332 result = m; 6333 6334 /* create SA extension */ 6335 m = key_setsadbsa(sav); 6336 if (!m) { 6337 error = ENOBUFS; 6338 goto fail; 6339 } 6340 m_cat(result, m); 6341 6342 /* create SA extension */ 6343 m = key_setsadbxsa2(sav->sah->saidx.mode, 6344 sav->replay ? sav->replay->count : 0, 6345 sav->sah->saidx.reqid); 6346 if (!m) { 6347 error = ENOBUFS; 6348 goto fail; 6349 } 6350 m_cat(result, m); 6351 6352 /* create lifetime extension (current and soft) */ 6353 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6354 m = key_alloc_mbuf(len); 6355 if (!m || m->m_next) { /*XXX*/ 6356 if (m) 6357 m_freem(m); 6358 error = ENOBUFS; 6359 goto fail; 6360 } 6361 bzero(mtod(m, caddr_t), len); 6362 lt = mtod(m, struct sadb_lifetime *); 6363 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6364 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6365 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6366 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6367 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6368 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6369 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6370 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6371 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6372 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6373 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6374 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6375 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6376 m_cat(result, m); 6377 6378 /* set sadb_address for source */ 6379 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6380 &sav->sah->saidx.src.sa, 6381 FULLMASK, IPSEC_ULPROTO_ANY); 6382 if (!m) { 6383 error = ENOBUFS; 6384 goto fail; 6385 } 6386 m_cat(result, m); 6387 6388 /* set sadb_address for destination */ 6389 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6390 &sav->sah->saidx.dst.sa, 6391 FULLMASK, IPSEC_ULPROTO_ANY); 6392 if (!m) { 6393 error = ENOBUFS; 6394 goto fail; 6395 } 6396 m_cat(result, m); 6397 6398 if ((result->m_flags & M_PKTHDR) == 0) { 6399 error = EINVAL; 6400 goto fail; 6401 } 6402 6403 if (result->m_len < sizeof(struct sadb_msg)) { 6404 result = m_pullup(result, sizeof(struct sadb_msg)); 6405 if (result == NULL) { 6406 error = ENOBUFS; 6407 goto fail; 6408 } 6409 } 6410 6411 result->m_pkthdr.len = 0; 6412 for (m = result; m; m = m->m_next) 6413 result->m_pkthdr.len += m->m_len; 6414 6415 mtod(result, struct sadb_msg *)->sadb_msg_len = 6416 PFKEY_UNIT64(result->m_pkthdr.len); 6417 6418 splx(s); 6419 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6420 6421 fail: 6422 if (result) 6423 m_freem(result); 6424 splx(s); 6425 return error; 6426} 6427 6428/* 6429 * SADB_FLUSH processing 6430 * receive 6431 * <base> 6432 * from the ikmpd, and free all entries in secastree. 6433 * and send, 6434 * <base> 6435 * to the ikmpd. 6436 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6437 * 6438 * m will always be freed. 6439 */ 6440static int 6441key_flush(so, m, mhp) 6442 struct socket *so; 6443 struct mbuf *m; 6444 const struct sadb_msghdr *mhp; 6445{ 6446 INIT_VNET_IPSEC(curvnet); 6447 struct sadb_msg *newmsg; 6448 struct secashead *sah, *nextsah; 6449 struct secasvar *sav, *nextsav; 6450 u_int16_t proto; 6451 u_int8_t state; 6452 u_int stateidx; 6453 6454 IPSEC_ASSERT(so != NULL, ("null socket")); 6455 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6456 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6457 6458 /* map satype to proto */ 6459 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6460 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6461 __func__)); 6462 return key_senderror(so, m, EINVAL); 6463 } 6464 6465 /* no SATYPE specified, i.e. flushing all SA. */ 6466 SAHTREE_LOCK(); 6467 for (sah = LIST_FIRST(&V_sahtree); 6468 sah != NULL; 6469 sah = nextsah) { 6470 nextsah = LIST_NEXT(sah, chain); 6471 6472 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6473 && proto != sah->saidx.proto) 6474 continue; 6475 6476 for (stateidx = 0; 6477 stateidx < _ARRAYLEN(saorder_state_alive); 6478 stateidx++) { 6479 state = saorder_state_any[stateidx]; 6480 for (sav = LIST_FIRST(&sah->savtree[state]); 6481 sav != NULL; 6482 sav = nextsav) { 6483 6484 nextsav = LIST_NEXT(sav, chain); 6485 6486 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6487 KEY_FREESAV(&sav); 6488 } 6489 } 6490 6491 sah->state = SADB_SASTATE_DEAD; 6492 } 6493 SAHTREE_UNLOCK(); 6494 6495 if (m->m_len < sizeof(struct sadb_msg) || 6496 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6497 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6498 return key_senderror(so, m, ENOBUFS); 6499 } 6500 6501 if (m->m_next) 6502 m_freem(m->m_next); 6503 m->m_next = NULL; 6504 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6505 newmsg = mtod(m, struct sadb_msg *); 6506 newmsg->sadb_msg_errno = 0; 6507 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6508 6509 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6510} 6511 6512/* 6513 * SADB_DUMP processing 6514 * dump all entries including status of DEAD in SAD. 6515 * receive 6516 * <base> 6517 * from the ikmpd, and dump all secasvar leaves 6518 * and send, 6519 * <base> ..... 6520 * to the ikmpd. 6521 * 6522 * m will always be freed. 6523 */ 6524static int 6525key_dump(so, m, mhp) 6526 struct socket *so; 6527 struct mbuf *m; 6528 const struct sadb_msghdr *mhp; 6529{ 6530 INIT_VNET_IPSEC(curvnet); 6531 struct secashead *sah; 6532 struct secasvar *sav; 6533 u_int16_t proto; 6534 u_int stateidx; 6535 u_int8_t satype; 6536 u_int8_t state; 6537 int cnt; 6538 struct sadb_msg *newmsg; 6539 struct mbuf *n; 6540 6541 IPSEC_ASSERT(so != NULL, ("null socket")); 6542 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6543 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6544 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6545 6546 /* map satype to proto */ 6547 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6548 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6549 __func__)); 6550 return key_senderror(so, m, EINVAL); 6551 } 6552 6553 /* count sav entries to be sent to the userland. */ 6554 cnt = 0; 6555 SAHTREE_LOCK(); 6556 LIST_FOREACH(sah, &V_sahtree, chain) { 6557 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6558 && proto != sah->saidx.proto) 6559 continue; 6560 6561 for (stateidx = 0; 6562 stateidx < _ARRAYLEN(saorder_state_any); 6563 stateidx++) { 6564 state = saorder_state_any[stateidx]; 6565 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6566 cnt++; 6567 } 6568 } 6569 } 6570 6571 if (cnt == 0) { 6572 SAHTREE_UNLOCK(); 6573 return key_senderror(so, m, ENOENT); 6574 } 6575 6576 /* send this to the userland, one at a time. */ 6577 newmsg = NULL; 6578 LIST_FOREACH(sah, &V_sahtree, chain) { 6579 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6580 && proto != sah->saidx.proto) 6581 continue; 6582 6583 /* map proto to satype */ 6584 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6585 SAHTREE_UNLOCK(); 6586 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6587 "SAD.\n", __func__)); 6588 return key_senderror(so, m, EINVAL); 6589 } 6590 6591 for (stateidx = 0; 6592 stateidx < _ARRAYLEN(saorder_state_any); 6593 stateidx++) { 6594 state = saorder_state_any[stateidx]; 6595 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6596 n = key_setdumpsa(sav, SADB_DUMP, satype, 6597 --cnt, mhp->msg->sadb_msg_pid); 6598 if (!n) { 6599 SAHTREE_UNLOCK(); 6600 return key_senderror(so, m, ENOBUFS); 6601 } 6602 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6603 } 6604 } 6605 } 6606 SAHTREE_UNLOCK(); 6607 6608 m_freem(m); 6609 return 0; 6610} 6611 6612/* 6613 * SADB_X_PROMISC processing 6614 * 6615 * m will always be freed. 6616 */ 6617static int 6618key_promisc(so, m, mhp) 6619 struct socket *so; 6620 struct mbuf *m; 6621 const struct sadb_msghdr *mhp; 6622{ 6623 int olen; 6624 6625 IPSEC_ASSERT(so != NULL, ("null socket")); 6626 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6627 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6628 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6629 6630 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6631 6632 if (olen < sizeof(struct sadb_msg)) { 6633#if 1 6634 return key_senderror(so, m, EINVAL); 6635#else 6636 m_freem(m); 6637 return 0; 6638#endif 6639 } else if (olen == sizeof(struct sadb_msg)) { 6640 /* enable/disable promisc mode */ 6641 struct keycb *kp; 6642 6643 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6644 return key_senderror(so, m, EINVAL); 6645 mhp->msg->sadb_msg_errno = 0; 6646 switch (mhp->msg->sadb_msg_satype) { 6647 case 0: 6648 case 1: 6649 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6650 break; 6651 default: 6652 return key_senderror(so, m, EINVAL); 6653 } 6654 6655 /* send the original message back to everyone */ 6656 mhp->msg->sadb_msg_errno = 0; 6657 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6658 } else { 6659 /* send packet as is */ 6660 6661 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6662 6663 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6664 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6665 } 6666} 6667 6668static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6669 const struct sadb_msghdr *)) = { 6670 NULL, /* SADB_RESERVED */ 6671 key_getspi, /* SADB_GETSPI */ 6672 key_update, /* SADB_UPDATE */ 6673 key_add, /* SADB_ADD */ 6674 key_delete, /* SADB_DELETE */ 6675 key_get, /* SADB_GET */ 6676 key_acquire2, /* SADB_ACQUIRE */ 6677 key_register, /* SADB_REGISTER */ 6678 NULL, /* SADB_EXPIRE */ 6679 key_flush, /* SADB_FLUSH */ 6680 key_dump, /* SADB_DUMP */ 6681 key_promisc, /* SADB_X_PROMISC */ 6682 NULL, /* SADB_X_PCHANGE */ 6683 key_spdadd, /* SADB_X_SPDUPDATE */ 6684 key_spdadd, /* SADB_X_SPDADD */ 6685 key_spddelete, /* SADB_X_SPDDELETE */ 6686 key_spdget, /* SADB_X_SPDGET */ 6687 NULL, /* SADB_X_SPDACQUIRE */ 6688 key_spddump, /* SADB_X_SPDDUMP */ 6689 key_spdflush, /* SADB_X_SPDFLUSH */ 6690 key_spdadd, /* SADB_X_SPDSETIDX */ 6691 NULL, /* SADB_X_SPDEXPIRE */ 6692 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6693}; 6694 6695/* 6696 * parse sadb_msg buffer to process PFKEYv2, 6697 * and create a data to response if needed. 6698 * I think to be dealed with mbuf directly. 6699 * IN: 6700 * msgp : pointer to pointer to a received buffer pulluped. 6701 * This is rewrited to response. 6702 * so : pointer to socket. 6703 * OUT: 6704 * length for buffer to send to user process. 6705 */ 6706int 6707key_parse(m, so) 6708 struct mbuf *m; 6709 struct socket *so; 6710{ 6711 INIT_VNET_IPSEC(curvnet); 6712 struct sadb_msg *msg; 6713 struct sadb_msghdr mh; 6714 u_int orglen; 6715 int error; 6716 int target; 6717 6718 IPSEC_ASSERT(so != NULL, ("null socket")); 6719 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6720 6721#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6722 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6723 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6724 kdebug_sadb(msg)); 6725#endif 6726 6727 if (m->m_len < sizeof(struct sadb_msg)) { 6728 m = m_pullup(m, sizeof(struct sadb_msg)); 6729 if (!m) 6730 return ENOBUFS; 6731 } 6732 msg = mtod(m, struct sadb_msg *); 6733 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6734 target = KEY_SENDUP_ONE; 6735 6736 if ((m->m_flags & M_PKTHDR) == 0 || 6737 m->m_pkthdr.len != m->m_pkthdr.len) { 6738 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6739 V_pfkeystat.out_invlen++; 6740 error = EINVAL; 6741 goto senderror; 6742 } 6743 6744 if (msg->sadb_msg_version != PF_KEY_V2) { 6745 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6746 __func__, msg->sadb_msg_version)); 6747 V_pfkeystat.out_invver++; 6748 error = EINVAL; 6749 goto senderror; 6750 } 6751 6752 if (msg->sadb_msg_type > SADB_MAX) { 6753 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6754 __func__, msg->sadb_msg_type)); 6755 V_pfkeystat.out_invmsgtype++; 6756 error = EINVAL; 6757 goto senderror; 6758 } 6759 6760 /* for old-fashioned code - should be nuked */ 6761 if (m->m_pkthdr.len > MCLBYTES) { 6762 m_freem(m); 6763 return ENOBUFS; 6764 } 6765 if (m->m_next) { 6766 struct mbuf *n; 6767 6768 MGETHDR(n, M_DONTWAIT, MT_DATA); 6769 if (n && m->m_pkthdr.len > MHLEN) { 6770 MCLGET(n, M_DONTWAIT); 6771 if ((n->m_flags & M_EXT) == 0) { 6772 m_free(n); 6773 n = NULL; 6774 } 6775 } 6776 if (!n) { 6777 m_freem(m); 6778 return ENOBUFS; 6779 } 6780 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6781 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6782 n->m_next = NULL; 6783 m_freem(m); 6784 m = n; 6785 } 6786 6787 /* align the mbuf chain so that extensions are in contiguous region. */ 6788 error = key_align(m, &mh); 6789 if (error) 6790 return error; 6791 6792 msg = mh.msg; 6793 6794 /* check SA type */ 6795 switch (msg->sadb_msg_satype) { 6796 case SADB_SATYPE_UNSPEC: 6797 switch (msg->sadb_msg_type) { 6798 case SADB_GETSPI: 6799 case SADB_UPDATE: 6800 case SADB_ADD: 6801 case SADB_DELETE: 6802 case SADB_GET: 6803 case SADB_ACQUIRE: 6804 case SADB_EXPIRE: 6805 ipseclog((LOG_DEBUG, "%s: must specify satype " 6806 "when msg type=%u.\n", __func__, 6807 msg->sadb_msg_type)); 6808 V_pfkeystat.out_invsatype++; 6809 error = EINVAL; 6810 goto senderror; 6811 } 6812 break; 6813 case SADB_SATYPE_AH: 6814 case SADB_SATYPE_ESP: 6815 case SADB_X_SATYPE_IPCOMP: 6816 case SADB_X_SATYPE_TCPSIGNATURE: 6817 switch (msg->sadb_msg_type) { 6818 case SADB_X_SPDADD: 6819 case SADB_X_SPDDELETE: 6820 case SADB_X_SPDGET: 6821 case SADB_X_SPDDUMP: 6822 case SADB_X_SPDFLUSH: 6823 case SADB_X_SPDSETIDX: 6824 case SADB_X_SPDUPDATE: 6825 case SADB_X_SPDDELETE2: 6826 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6827 __func__, msg->sadb_msg_type)); 6828 V_pfkeystat.out_invsatype++; 6829 error = EINVAL; 6830 goto senderror; 6831 } 6832 break; 6833 case SADB_SATYPE_RSVP: 6834 case SADB_SATYPE_OSPFV2: 6835 case SADB_SATYPE_RIPV2: 6836 case SADB_SATYPE_MIP: 6837 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6838 __func__, msg->sadb_msg_satype)); 6839 V_pfkeystat.out_invsatype++; 6840 error = EOPNOTSUPP; 6841 goto senderror; 6842 case 1: /* XXX: What does it do? */ 6843 if (msg->sadb_msg_type == SADB_X_PROMISC) 6844 break; 6845 /*FALLTHROUGH*/ 6846 default: 6847 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6848 __func__, msg->sadb_msg_satype)); 6849 V_pfkeystat.out_invsatype++; 6850 error = EINVAL; 6851 goto senderror; 6852 } 6853 6854 /* check field of upper layer protocol and address family */ 6855 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6856 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6857 struct sadb_address *src0, *dst0; 6858 u_int plen; 6859 6860 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6861 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6862 6863 /* check upper layer protocol */ 6864 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6865 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6866 "mismatched.\n", __func__)); 6867 V_pfkeystat.out_invaddr++; 6868 error = EINVAL; 6869 goto senderror; 6870 } 6871 6872 /* check family */ 6873 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6874 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6875 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6876 __func__)); 6877 V_pfkeystat.out_invaddr++; 6878 error = EINVAL; 6879 goto senderror; 6880 } 6881 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6882 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6883 ipseclog((LOG_DEBUG, "%s: address struct size " 6884 "mismatched.\n", __func__)); 6885 V_pfkeystat.out_invaddr++; 6886 error = EINVAL; 6887 goto senderror; 6888 } 6889 6890 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6891 case AF_INET: 6892 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6893 sizeof(struct sockaddr_in)) { 6894 V_pfkeystat.out_invaddr++; 6895 error = EINVAL; 6896 goto senderror; 6897 } 6898 break; 6899 case AF_INET6: 6900 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6901 sizeof(struct sockaddr_in6)) { 6902 V_pfkeystat.out_invaddr++; 6903 error = EINVAL; 6904 goto senderror; 6905 } 6906 break; 6907 default: 6908 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6909 __func__)); 6910 V_pfkeystat.out_invaddr++; 6911 error = EAFNOSUPPORT; 6912 goto senderror; 6913 } 6914 6915 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6916 case AF_INET: 6917 plen = sizeof(struct in_addr) << 3; 6918 break; 6919 case AF_INET6: 6920 plen = sizeof(struct in6_addr) << 3; 6921 break; 6922 default: 6923 plen = 0; /*fool gcc*/ 6924 break; 6925 } 6926 6927 /* check max prefix length */ 6928 if (src0->sadb_address_prefixlen > plen || 6929 dst0->sadb_address_prefixlen > plen) { 6930 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6931 __func__)); 6932 V_pfkeystat.out_invaddr++; 6933 error = EINVAL; 6934 goto senderror; 6935 } 6936 6937 /* 6938 * prefixlen == 0 is valid because there can be a case when 6939 * all addresses are matched. 6940 */ 6941 } 6942 6943 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6944 key_typesw[msg->sadb_msg_type] == NULL) { 6945 V_pfkeystat.out_invmsgtype++; 6946 error = EINVAL; 6947 goto senderror; 6948 } 6949 6950 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6951 6952senderror: 6953 msg->sadb_msg_errno = error; 6954 return key_sendup_mbuf(so, m, target); 6955} 6956 6957static int 6958key_senderror(so, m, code) 6959 struct socket *so; 6960 struct mbuf *m; 6961 int code; 6962{ 6963 struct sadb_msg *msg; 6964 6965 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6966 ("mbuf too small, len %u", m->m_len)); 6967 6968 msg = mtod(m, struct sadb_msg *); 6969 msg->sadb_msg_errno = code; 6970 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6971} 6972 6973/* 6974 * set the pointer to each header into message buffer. 6975 * m will be freed on error. 6976 * XXX larger-than-MCLBYTES extension? 6977 */ 6978static int 6979key_align(m, mhp) 6980 struct mbuf *m; 6981 struct sadb_msghdr *mhp; 6982{ 6983 INIT_VNET_IPSEC(curvnet); 6984 struct mbuf *n; 6985 struct sadb_ext *ext; 6986 size_t off, end; 6987 int extlen; 6988 int toff; 6989 6990 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6991 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6992 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6993 ("mbuf too small, len %u", m->m_len)); 6994 6995 /* initialize */ 6996 bzero(mhp, sizeof(*mhp)); 6997 6998 mhp->msg = mtod(m, struct sadb_msg *); 6999 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7000 7001 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7002 extlen = end; /*just in case extlen is not updated*/ 7003 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7004 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7005 if (!n) { 7006 /* m is already freed */ 7007 return ENOBUFS; 7008 } 7009 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7010 7011 /* set pointer */ 7012 switch (ext->sadb_ext_type) { 7013 case SADB_EXT_SA: 7014 case SADB_EXT_ADDRESS_SRC: 7015 case SADB_EXT_ADDRESS_DST: 7016 case SADB_EXT_ADDRESS_PROXY: 7017 case SADB_EXT_LIFETIME_CURRENT: 7018 case SADB_EXT_LIFETIME_HARD: 7019 case SADB_EXT_LIFETIME_SOFT: 7020 case SADB_EXT_KEY_AUTH: 7021 case SADB_EXT_KEY_ENCRYPT: 7022 case SADB_EXT_IDENTITY_SRC: 7023 case SADB_EXT_IDENTITY_DST: 7024 case SADB_EXT_SENSITIVITY: 7025 case SADB_EXT_PROPOSAL: 7026 case SADB_EXT_SUPPORTED_AUTH: 7027 case SADB_EXT_SUPPORTED_ENCRYPT: 7028 case SADB_EXT_SPIRANGE: 7029 case SADB_X_EXT_POLICY: 7030 case SADB_X_EXT_SA2: 7031 /* duplicate check */ 7032 /* 7033 * XXX Are there duplication payloads of either 7034 * KEY_AUTH or KEY_ENCRYPT ? 7035 */ 7036 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7037 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7038 "%u\n", __func__, ext->sadb_ext_type)); 7039 m_freem(m); 7040 V_pfkeystat.out_dupext++; 7041 return EINVAL; 7042 } 7043 break; 7044 default: 7045 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7046 __func__, ext->sadb_ext_type)); 7047 m_freem(m); 7048 V_pfkeystat.out_invexttype++; 7049 return EINVAL; 7050 } 7051 7052 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7053 7054 if (key_validate_ext(ext, extlen)) { 7055 m_freem(m); 7056 V_pfkeystat.out_invlen++; 7057 return EINVAL; 7058 } 7059 7060 n = m_pulldown(m, off, extlen, &toff); 7061 if (!n) { 7062 /* m is already freed */ 7063 return ENOBUFS; 7064 } 7065 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7066 7067 mhp->ext[ext->sadb_ext_type] = ext; 7068 mhp->extoff[ext->sadb_ext_type] = off; 7069 mhp->extlen[ext->sadb_ext_type] = extlen; 7070 } 7071 7072 if (off != end) { 7073 m_freem(m); 7074 V_pfkeystat.out_invlen++; 7075 return EINVAL; 7076 } 7077 7078 return 0; 7079} 7080 7081static int 7082key_validate_ext(ext, len) 7083 const struct sadb_ext *ext; 7084 int len; 7085{ 7086 const struct sockaddr *sa; 7087 enum { NONE, ADDR } checktype = NONE; 7088 int baselen = 0; 7089 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7090 7091 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7092 return EINVAL; 7093 7094 /* if it does not match minimum/maximum length, bail */ 7095 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7096 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7097 return EINVAL; 7098 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7099 return EINVAL; 7100 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7101 return EINVAL; 7102 7103 /* more checks based on sadb_ext_type XXX need more */ 7104 switch (ext->sadb_ext_type) { 7105 case SADB_EXT_ADDRESS_SRC: 7106 case SADB_EXT_ADDRESS_DST: 7107 case SADB_EXT_ADDRESS_PROXY: 7108 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7109 checktype = ADDR; 7110 break; 7111 case SADB_EXT_IDENTITY_SRC: 7112 case SADB_EXT_IDENTITY_DST: 7113 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7114 SADB_X_IDENTTYPE_ADDR) { 7115 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7116 checktype = ADDR; 7117 } else 7118 checktype = NONE; 7119 break; 7120 default: 7121 checktype = NONE; 7122 break; 7123 } 7124 7125 switch (checktype) { 7126 case NONE: 7127 break; 7128 case ADDR: 7129 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7130 if (len < baselen + sal) 7131 return EINVAL; 7132 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7133 return EINVAL; 7134 break; 7135 } 7136 7137 return 0; 7138} 7139 7140void 7141key_init(void) 7142{ 7143 INIT_VNET_IPSEC(curvnet); 7144 int i; 7145 7146 V_key_debug_level = 0; 7147 V_key_spi_trycnt = 1000; 7148 V_key_spi_minval = 0x100; 7149 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7150 V_policy_id = 0; 7151 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7152 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7153 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7154 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7155 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7156 7157 V_acq_seq = 0; 7158 7159 V_ipsec_esp_keymin = 256; 7160 V_ipsec_esp_auth = 0; 7161 V_ipsec_ah_keymin = 128; 7162 7163 SPTREE_LOCK_INIT(); 7164 REGTREE_LOCK_INIT(); 7165 SAHTREE_LOCK_INIT(); 7166 ACQ_LOCK_INIT(); 7167 SPACQ_LOCK_INIT(); 7168 7169 for (i = 0; i < IPSEC_DIR_MAX; i++) 7170 LIST_INIT(&V_sptree[i]); 7171 7172 LIST_INIT(&V_sahtree); 7173 7174 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7175 LIST_INIT(&V_regtree[i]); 7176 7177 LIST_INIT(&V_acqtree); 7178 LIST_INIT(&V_spacqtree); 7179 7180 /* system default */ 7181 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7182 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7183 7184#ifndef IPSEC_DEBUG2 7185 timeout((void *)key_timehandler, (void *)0, hz); 7186#endif /*IPSEC_DEBUG2*/ 7187 7188 /* initialize key statistics */ 7189 keystat.getspi_count = 1; 7190 7191 printf("IPsec: Initialized Security Association Processing.\n"); 7192 7193 return; 7194} 7195 7196/* 7197 * XXX: maybe This function is called after INBOUND IPsec processing. 7198 * 7199 * Special check for tunnel-mode packets. 7200 * We must make some checks for consistency between inner and outer IP header. 7201 * 7202 * xxx more checks to be provided 7203 */ 7204int 7205key_checktunnelsanity(sav, family, src, dst) 7206 struct secasvar *sav; 7207 u_int family; 7208 caddr_t src; 7209 caddr_t dst; 7210{ 7211 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7212 7213 /* XXX: check inner IP header */ 7214 7215 return 1; 7216} 7217 7218/* record data transfer on SA, and update timestamps */ 7219void 7220key_sa_recordxfer(sav, m) 7221 struct secasvar *sav; 7222 struct mbuf *m; 7223{ 7224 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7225 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7226 if (!sav->lft_c) 7227 return; 7228 7229 /* 7230 * XXX Currently, there is a difference of bytes size 7231 * between inbound and outbound processing. 7232 */ 7233 sav->lft_c->bytes += m->m_pkthdr.len; 7234 /* to check bytes lifetime is done in key_timehandler(). */ 7235 7236 /* 7237 * We use the number of packets as the unit of 7238 * allocations. We increment the variable 7239 * whenever {esp,ah}_{in,out}put is called. 7240 */ 7241 sav->lft_c->allocations++; 7242 /* XXX check for expires? */ 7243 7244 /* 7245 * NOTE: We record CURRENT usetime by using wall clock, 7246 * in seconds. HARD and SOFT lifetime are measured by the time 7247 * difference (again in seconds) from usetime. 7248 * 7249 * usetime 7250 * v expire expire 7251 * -----+-----+--------+---> t 7252 * <--------------> HARD 7253 * <-----> SOFT 7254 */ 7255 sav->lft_c->usetime = time_second; 7256 /* XXX check for expires? */ 7257 7258 return; 7259} 7260 7261/* dumb version */ 7262void 7263key_sa_routechange(dst) 7264 struct sockaddr *dst; 7265{ 7266 INIT_VNET_IPSEC(curvnet); 7267 struct secashead *sah; 7268 struct route *ro; 7269 7270 SAHTREE_LOCK(); 7271 LIST_FOREACH(sah, &V_sahtree, chain) { 7272 ro = &sah->sa_route; 7273 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7274 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7275 RTFREE(ro->ro_rt); 7276 ro->ro_rt = (struct rtentry *)NULL; 7277 } 7278 } 7279 SAHTREE_UNLOCK(); 7280} 7281 7282static void 7283key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7284{ 7285 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7286 SAHTREE_LOCK_ASSERT(); 7287 7288 if (sav->state != state) { 7289 if (__LIST_CHAINED(sav)) 7290 LIST_REMOVE(sav, chain); 7291 sav->state = state; 7292 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7293 } 7294} 7295 7296void 7297key_sa_stir_iv(sav) 7298 struct secasvar *sav; 7299{ 7300 7301 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7302 key_randomfill(sav->iv, sav->ivlen); 7303} 7304 7305/* XXX too much? */ 7306static struct mbuf * 7307key_alloc_mbuf(l) 7308 int l; 7309{ 7310 struct mbuf *m = NULL, *n; 7311 int len, t; 7312 7313 len = l; 7314 while (len > 0) { 7315 MGET(n, M_DONTWAIT, MT_DATA); 7316 if (n && len > MLEN) 7317 MCLGET(n, M_DONTWAIT); 7318 if (!n) { 7319 m_freem(m); 7320 return NULL; 7321 } 7322 7323 n->m_next = NULL; 7324 n->m_len = 0; 7325 n->m_len = M_TRAILINGSPACE(n); 7326 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7327 if (n->m_len > len) { 7328 t = (n->m_len - len) & ~(sizeof(long) - 1); 7329 n->m_data += t; 7330 n->m_len = len; 7331 } 7332 7333 len -= n->m_len; 7334 7335 if (m) 7336 m_cat(m, n); 7337 else 7338 m = n; 7339 } 7340 7341 return m; 7342} 7343 7344/* 7345 * Take one of the kernel's security keys and convert it into a PF_KEY 7346 * structure within an mbuf, suitable for sending up to a waiting 7347 * application in user land. 7348 * 7349 * IN: 7350 * src: A pointer to a kernel security key. 7351 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7352 * OUT: 7353 * a valid mbuf or NULL indicating an error 7354 * 7355 */ 7356 7357static struct mbuf * 7358key_setkey(struct seckey *src, u_int16_t exttype) 7359{ 7360 struct mbuf *m; 7361 struct sadb_key *p; 7362 int len; 7363 7364 if (src == NULL) 7365 return NULL; 7366 7367 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7368 m = key_alloc_mbuf(len); 7369 if (m == NULL) 7370 return NULL; 7371 p = mtod(m, struct sadb_key *); 7372 bzero(p, len); 7373 p->sadb_key_len = PFKEY_UNIT64(len); 7374 p->sadb_key_exttype = exttype; 7375 p->sadb_key_bits = src->bits; 7376 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7377 7378 return m; 7379} 7380 7381/* 7382 * Take one of the kernel's lifetime data structures and convert it 7383 * into a PF_KEY structure within an mbuf, suitable for sending up to 7384 * a waiting application in user land. 7385 * 7386 * IN: 7387 * src: A pointer to a kernel lifetime structure. 7388 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7389 * data structures for more information. 7390 * OUT: 7391 * a valid mbuf or NULL indicating an error 7392 * 7393 */ 7394 7395static struct mbuf * 7396key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7397{ 7398 struct mbuf *m = NULL; 7399 struct sadb_lifetime *p; 7400 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7401 7402 if (src == NULL) 7403 return NULL; 7404 7405 m = key_alloc_mbuf(len); 7406 if (m == NULL) 7407 return m; 7408 p = mtod(m, struct sadb_lifetime *); 7409 7410 bzero(p, len); 7411 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7412 p->sadb_lifetime_exttype = exttype; 7413 p->sadb_lifetime_allocations = src->allocations; 7414 p->sadb_lifetime_bytes = src->bytes; 7415 p->sadb_lifetime_addtime = src->addtime; 7416 p->sadb_lifetime_usetime = src->usetime; 7417 7418 return m; 7419 7420} 7421