key.c revision 190138
1/* $FreeBSD: head/sys/netipsec/key.c 190138 2009-03-20 09:12:01Z 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 /* 2691 * do NOT call KEY_FREESAV here: 2692 * it will only delete the sav if refcnt == 1, 2693 * where we already know that refcnt == 0 2694 */ 2695 key_delsav(sav); 2696 } else { 2697 /* give up to delete this sa */ 2698 zombie++; 2699 } 2700 } 2701 } 2702 if (!zombie) { /* delete only if there are savs */ 2703 /* remove from tree of SA index */ 2704 if (__LIST_CHAINED(sah)) 2705 LIST_REMOVE(sah, chain); 2706 if (sah->sa_route.ro_rt) { 2707 RTFREE(sah->sa_route.ro_rt); 2708 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2709 } 2710 free(sah, M_IPSEC_SAH); 2711 } 2712} 2713 2714/* 2715 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2716 * and copy the values of mhp into new buffer. 2717 * When SAD message type is GETSPI: 2718 * to set sequence number from acq_seq++, 2719 * to set zero to SPI. 2720 * not to call key_setsava(). 2721 * OUT: NULL : fail 2722 * others : pointer to new secasvar. 2723 * 2724 * does not modify mbuf. does not free mbuf on error. 2725 */ 2726static struct secasvar * 2727key_newsav(m, mhp, sah, errp, where, tag) 2728 struct mbuf *m; 2729 const struct sadb_msghdr *mhp; 2730 struct secashead *sah; 2731 int *errp; 2732 const char* where; 2733 int tag; 2734{ 2735 INIT_VNET_IPSEC(curvnet); 2736 struct secasvar *newsav; 2737 const struct sadb_sa *xsa; 2738 2739 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2740 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2741 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2742 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2743 2744 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2745 if (newsav == NULL) { 2746 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2747 *errp = ENOBUFS; 2748 goto done; 2749 } 2750 2751 switch (mhp->msg->sadb_msg_type) { 2752 case SADB_GETSPI: 2753 newsav->spi = 0; 2754 2755#ifdef IPSEC_DOSEQCHECK 2756 /* sync sequence number */ 2757 if (mhp->msg->sadb_msg_seq == 0) 2758 newsav->seq = 2759 (V_acq_seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq)); 2760 else 2761#endif 2762 newsav->seq = mhp->msg->sadb_msg_seq; 2763 break; 2764 2765 case SADB_ADD: 2766 /* sanity check */ 2767 if (mhp->ext[SADB_EXT_SA] == NULL) { 2768 free(newsav, M_IPSEC_SA); 2769 newsav = NULL; 2770 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2771 __func__)); 2772 *errp = EINVAL; 2773 goto done; 2774 } 2775 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2776 newsav->spi = xsa->sadb_sa_spi; 2777 newsav->seq = mhp->msg->sadb_msg_seq; 2778 break; 2779 default: 2780 free(newsav, M_IPSEC_SA); 2781 newsav = NULL; 2782 *errp = EINVAL; 2783 goto done; 2784 } 2785 2786 2787 /* copy sav values */ 2788 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2789 *errp = key_setsaval(newsav, m, mhp); 2790 if (*errp) { 2791 free(newsav, M_IPSEC_SA); 2792 newsav = NULL; 2793 goto done; 2794 } 2795 } 2796 2797 SECASVAR_LOCK_INIT(newsav); 2798 2799 /* reset created */ 2800 newsav->created = time_second; 2801 newsav->pid = mhp->msg->sadb_msg_pid; 2802 2803 /* add to satree */ 2804 newsav->sah = sah; 2805 sa_initref(newsav); 2806 newsav->state = SADB_SASTATE_LARVAL; 2807 2808 /* XXX locking??? */ 2809 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2810 secasvar, chain); 2811done: 2812 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2813 printf("DP %s from %s:%u return SP:%p\n", __func__, 2814 where, tag, newsav)); 2815 2816 return newsav; 2817} 2818 2819/* 2820 * free() SA variable entry. 2821 */ 2822static void 2823key_cleansav(struct secasvar *sav) 2824{ 2825 /* 2826 * Cleanup xform state. Note that zeroize'ing causes the 2827 * keys to be cleared; otherwise we must do it ourself. 2828 */ 2829 if (sav->tdb_xform != NULL) { 2830 sav->tdb_xform->xf_zeroize(sav); 2831 sav->tdb_xform = NULL; 2832 } else { 2833 KASSERT(sav->iv == NULL, ("iv but no xform")); 2834 if (sav->key_auth != NULL) 2835 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2836 if (sav->key_enc != NULL) 2837 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2838 } 2839 if (sav->key_auth != NULL) { 2840 if (sav->key_auth->key_data != NULL) 2841 free(sav->key_auth->key_data, M_IPSEC_MISC); 2842 free(sav->key_auth, M_IPSEC_MISC); 2843 sav->key_auth = NULL; 2844 } 2845 if (sav->key_enc != NULL) { 2846 if (sav->key_enc->key_data != NULL) 2847 free(sav->key_enc->key_data, M_IPSEC_MISC); 2848 free(sav->key_enc, M_IPSEC_MISC); 2849 sav->key_enc = NULL; 2850 } 2851 if (sav->sched) { 2852 bzero(sav->sched, sav->schedlen); 2853 free(sav->sched, M_IPSEC_MISC); 2854 sav->sched = NULL; 2855 } 2856 if (sav->replay != NULL) { 2857 free(sav->replay, M_IPSEC_MISC); 2858 sav->replay = NULL; 2859 } 2860 if (sav->lft_c != NULL) { 2861 free(sav->lft_c, M_IPSEC_MISC); 2862 sav->lft_c = NULL; 2863 } 2864 if (sav->lft_h != NULL) { 2865 free(sav->lft_h, M_IPSEC_MISC); 2866 sav->lft_h = NULL; 2867 } 2868 if (sav->lft_s != NULL) { 2869 free(sav->lft_s, M_IPSEC_MISC); 2870 sav->lft_s = NULL; 2871 } 2872} 2873 2874/* 2875 * free() SA variable entry. 2876 */ 2877static void 2878key_delsav(sav) 2879 struct secasvar *sav; 2880{ 2881 IPSEC_ASSERT(sav != NULL, ("null sav")); 2882 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2883 2884 /* remove from SA header */ 2885 if (__LIST_CHAINED(sav)) 2886 LIST_REMOVE(sav, chain); 2887 key_cleansav(sav); 2888 SECASVAR_LOCK_DESTROY(sav); 2889 free(sav, M_IPSEC_SA); 2890} 2891 2892/* 2893 * search SAD. 2894 * OUT: 2895 * NULL : not found 2896 * others : found, pointer to a SA. 2897 */ 2898static struct secashead * 2899key_getsah(saidx) 2900 struct secasindex *saidx; 2901{ 2902 INIT_VNET_IPSEC(curvnet); 2903 struct secashead *sah; 2904 2905 SAHTREE_LOCK(); 2906 LIST_FOREACH(sah, &V_sahtree, chain) { 2907 if (sah->state == SADB_SASTATE_DEAD) 2908 continue; 2909 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2910 break; 2911 } 2912 SAHTREE_UNLOCK(); 2913 2914 return sah; 2915} 2916 2917/* 2918 * check not to be duplicated SPI. 2919 * NOTE: this function is too slow due to searching all SAD. 2920 * OUT: 2921 * NULL : not found 2922 * others : found, pointer to a SA. 2923 */ 2924static struct secasvar * 2925key_checkspidup(saidx, spi) 2926 struct secasindex *saidx; 2927 u_int32_t spi; 2928{ 2929 INIT_VNET_IPSEC(curvnet); 2930 struct secashead *sah; 2931 struct secasvar *sav; 2932 2933 /* check address family */ 2934 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2935 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2936 __func__)); 2937 return NULL; 2938 } 2939 2940 sav = NULL; 2941 /* check all SAD */ 2942 SAHTREE_LOCK(); 2943 LIST_FOREACH(sah, &V_sahtree, chain) { 2944 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2945 continue; 2946 sav = key_getsavbyspi(sah, spi); 2947 if (sav != NULL) 2948 break; 2949 } 2950 SAHTREE_UNLOCK(); 2951 2952 return sav; 2953} 2954 2955/* 2956 * search SAD litmited alive SA, protocol, SPI. 2957 * OUT: 2958 * NULL : not found 2959 * others : found, pointer to a SA. 2960 */ 2961static struct secasvar * 2962key_getsavbyspi(sah, spi) 2963 struct secashead *sah; 2964 u_int32_t spi; 2965{ 2966 INIT_VNET_IPSEC(curvnet); 2967 struct secasvar *sav; 2968 u_int stateidx, state; 2969 2970 sav = NULL; 2971 SAHTREE_LOCK_ASSERT(); 2972 /* search all status */ 2973 for (stateidx = 0; 2974 stateidx < _ARRAYLEN(saorder_state_alive); 2975 stateidx++) { 2976 2977 state = saorder_state_alive[stateidx]; 2978 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2979 2980 /* sanity check */ 2981 if (sav->state != state) { 2982 ipseclog((LOG_DEBUG, "%s: " 2983 "invalid sav->state (queue: %d SA: %d)\n", 2984 __func__, state, sav->state)); 2985 continue; 2986 } 2987 2988 if (sav->spi == spi) 2989 return sav; 2990 } 2991 } 2992 2993 return NULL; 2994} 2995 2996/* 2997 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2998 * You must update these if need. 2999 * OUT: 0: success. 3000 * !0: failure. 3001 * 3002 * does not modify mbuf. does not free mbuf on error. 3003 */ 3004static int 3005key_setsaval(sav, m, mhp) 3006 struct secasvar *sav; 3007 struct mbuf *m; 3008 const struct sadb_msghdr *mhp; 3009{ 3010 INIT_VNET_IPSEC(curvnet); 3011 int error = 0; 3012 3013 IPSEC_ASSERT(m != NULL, ("null mbuf")); 3014 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 3015 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 3016 3017 /* initialization */ 3018 sav->replay = NULL; 3019 sav->key_auth = NULL; 3020 sav->key_enc = NULL; 3021 sav->sched = NULL; 3022 sav->schedlen = 0; 3023 sav->iv = NULL; 3024 sav->lft_c = NULL; 3025 sav->lft_h = NULL; 3026 sav->lft_s = NULL; 3027 sav->tdb_xform = NULL; /* transform */ 3028 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3029 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3030 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3031 3032 /* SA */ 3033 if (mhp->ext[SADB_EXT_SA] != NULL) { 3034 const struct sadb_sa *sa0; 3035 3036 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3037 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3038 error = EINVAL; 3039 goto fail; 3040 } 3041 3042 sav->alg_auth = sa0->sadb_sa_auth; 3043 sav->alg_enc = sa0->sadb_sa_encrypt; 3044 sav->flags = sa0->sadb_sa_flags; 3045 3046 /* replay window */ 3047 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3048 sav->replay = (struct secreplay *) 3049 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3050 if (sav->replay == NULL) { 3051 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3052 __func__)); 3053 error = ENOBUFS; 3054 goto fail; 3055 } 3056 if (sa0->sadb_sa_replay != 0) 3057 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3058 sav->replay->wsize = sa0->sadb_sa_replay; 3059 } 3060 } 3061 3062 /* Authentication keys */ 3063 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3064 const struct sadb_key *key0; 3065 int len; 3066 3067 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3068 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3069 3070 error = 0; 3071 if (len < sizeof(*key0)) { 3072 error = EINVAL; 3073 goto fail; 3074 } 3075 switch (mhp->msg->sadb_msg_satype) { 3076 case SADB_SATYPE_AH: 3077 case SADB_SATYPE_ESP: 3078 case SADB_X_SATYPE_TCPSIGNATURE: 3079 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3080 sav->alg_auth != SADB_X_AALG_NULL) 3081 error = EINVAL; 3082 break; 3083 case SADB_X_SATYPE_IPCOMP: 3084 default: 3085 error = EINVAL; 3086 break; 3087 } 3088 if (error) { 3089 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3090 __func__)); 3091 goto fail; 3092 } 3093 3094 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3095 M_IPSEC_MISC); 3096 if (sav->key_auth == NULL ) { 3097 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3098 __func__)); 3099 error = ENOBUFS; 3100 goto fail; 3101 } 3102 } 3103 3104 /* Encryption key */ 3105 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3106 const struct sadb_key *key0; 3107 int len; 3108 3109 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3110 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3111 3112 error = 0; 3113 if (len < sizeof(*key0)) { 3114 error = EINVAL; 3115 goto fail; 3116 } 3117 switch (mhp->msg->sadb_msg_satype) { 3118 case SADB_SATYPE_ESP: 3119 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3120 sav->alg_enc != SADB_EALG_NULL) { 3121 error = EINVAL; 3122 break; 3123 } 3124 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3125 len, 3126 M_IPSEC_MISC); 3127 if (sav->key_enc == NULL) { 3128 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3129 __func__)); 3130 error = ENOBUFS; 3131 goto fail; 3132 } 3133 break; 3134 case SADB_X_SATYPE_IPCOMP: 3135 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3136 error = EINVAL; 3137 sav->key_enc = NULL; /*just in case*/ 3138 break; 3139 case SADB_SATYPE_AH: 3140 case SADB_X_SATYPE_TCPSIGNATURE: 3141 default: 3142 error = EINVAL; 3143 break; 3144 } 3145 if (error) { 3146 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3147 __func__)); 3148 goto fail; 3149 } 3150 } 3151 3152 /* set iv */ 3153 sav->ivlen = 0; 3154 3155 switch (mhp->msg->sadb_msg_satype) { 3156 case SADB_SATYPE_AH: 3157 error = xform_init(sav, XF_AH); 3158 break; 3159 case SADB_SATYPE_ESP: 3160 error = xform_init(sav, XF_ESP); 3161 break; 3162 case SADB_X_SATYPE_IPCOMP: 3163 error = xform_init(sav, XF_IPCOMP); 3164 break; 3165 case SADB_X_SATYPE_TCPSIGNATURE: 3166 error = xform_init(sav, XF_TCPSIGNATURE); 3167 break; 3168 } 3169 if (error) { 3170 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3171 __func__, mhp->msg->sadb_msg_satype)); 3172 goto fail; 3173 } 3174 3175 /* reset created */ 3176 sav->created = time_second; 3177 3178 /* make lifetime for CURRENT */ 3179 sav->lft_c = malloc(sizeof(struct seclifetime), M_IPSEC_MISC, M_NOWAIT); 3180 if (sav->lft_c == NULL) { 3181 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3182 error = ENOBUFS; 3183 goto fail; 3184 } 3185 3186 sav->lft_c->allocations = 0; 3187 sav->lft_c->bytes = 0; 3188 sav->lft_c->addtime = time_second; 3189 sav->lft_c->usetime = 0; 3190 3191 /* lifetimes for HARD and SOFT */ 3192 { 3193 const struct sadb_lifetime *lft0; 3194 3195 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3196 if (lft0 != NULL) { 3197 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3198 error = EINVAL; 3199 goto fail; 3200 } 3201 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3202 if (sav->lft_h == NULL) { 3203 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3204 error = ENOBUFS; 3205 goto fail; 3206 } 3207 /* to be initialize ? */ 3208 } 3209 3210 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3211 if (lft0 != NULL) { 3212 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3213 error = EINVAL; 3214 goto fail; 3215 } 3216 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3217 if (sav->lft_s == NULL) { 3218 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3219 error = ENOBUFS; 3220 goto fail; 3221 } 3222 /* to be initialize ? */ 3223 } 3224 } 3225 3226 return 0; 3227 3228 fail: 3229 /* initialization */ 3230 key_cleansav(sav); 3231 3232 return error; 3233} 3234 3235/* 3236 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3237 * OUT: 0: valid 3238 * other: errno 3239 */ 3240static int 3241key_mature(struct secasvar *sav) 3242{ 3243 INIT_VNET_IPSEC(curvnet); 3244 int error; 3245 3246 /* check SPI value */ 3247 switch (sav->sah->saidx.proto) { 3248 case IPPROTO_ESP: 3249 case IPPROTO_AH: 3250 /* 3251 * RFC 4302, 2.4. Security Parameters Index (SPI), SPI values 3252 * 1-255 reserved by IANA for future use, 3253 * 0 for implementation specific, local use. 3254 */ 3255 if (ntohl(sav->spi) <= 255) { 3256 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3257 __func__, (u_int32_t)ntohl(sav->spi))); 3258 return EINVAL; 3259 } 3260 break; 3261 } 3262 3263 /* check satype */ 3264 switch (sav->sah->saidx.proto) { 3265 case IPPROTO_ESP: 3266 /* check flags */ 3267 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3268 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3269 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3270 "given to old-esp.\n", __func__)); 3271 return EINVAL; 3272 } 3273 error = xform_init(sav, XF_ESP); 3274 break; 3275 case IPPROTO_AH: 3276 /* check flags */ 3277 if (sav->flags & SADB_X_EXT_DERIV) { 3278 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3279 "given to AH SA.\n", __func__)); 3280 return EINVAL; 3281 } 3282 if (sav->alg_enc != SADB_EALG_NONE) { 3283 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3284 "mismated.\n", __func__)); 3285 return(EINVAL); 3286 } 3287 error = xform_init(sav, XF_AH); 3288 break; 3289 case IPPROTO_IPCOMP: 3290 if (sav->alg_auth != SADB_AALG_NONE) { 3291 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3292 "mismated.\n", __func__)); 3293 return(EINVAL); 3294 } 3295 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3296 && ntohl(sav->spi) >= 0x10000) { 3297 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3298 __func__)); 3299 return(EINVAL); 3300 } 3301 error = xform_init(sav, XF_IPCOMP); 3302 break; 3303 case IPPROTO_TCP: 3304 if (sav->alg_enc != SADB_EALG_NONE) { 3305 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3306 "mismated.\n", __func__)); 3307 return(EINVAL); 3308 } 3309 error = xform_init(sav, XF_TCPSIGNATURE); 3310 break; 3311 default: 3312 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3313 error = EPROTONOSUPPORT; 3314 break; 3315 } 3316 if (error == 0) { 3317 SAHTREE_LOCK(); 3318 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3319 SAHTREE_UNLOCK(); 3320 } 3321 return (error); 3322} 3323 3324/* 3325 * subroutine for SADB_GET and SADB_DUMP. 3326 */ 3327static struct mbuf * 3328key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3329 u_int32_t seq, u_int32_t pid) 3330{ 3331 struct mbuf *result = NULL, *tres = NULL, *m; 3332 int i; 3333 int dumporder[] = { 3334 SADB_EXT_SA, SADB_X_EXT_SA2, 3335 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3336 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3337 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3338 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3339 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3340 }; 3341 3342 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3343 if (m == NULL) 3344 goto fail; 3345 result = m; 3346 3347 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3348 m = NULL; 3349 switch (dumporder[i]) { 3350 case SADB_EXT_SA: 3351 m = key_setsadbsa(sav); 3352 if (!m) 3353 goto fail; 3354 break; 3355 3356 case SADB_X_EXT_SA2: 3357 m = key_setsadbxsa2(sav->sah->saidx.mode, 3358 sav->replay ? sav->replay->count : 0, 3359 sav->sah->saidx.reqid); 3360 if (!m) 3361 goto fail; 3362 break; 3363 3364 case SADB_EXT_ADDRESS_SRC: 3365 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3366 &sav->sah->saidx.src.sa, 3367 FULLMASK, IPSEC_ULPROTO_ANY); 3368 if (!m) 3369 goto fail; 3370 break; 3371 3372 case SADB_EXT_ADDRESS_DST: 3373 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3374 &sav->sah->saidx.dst.sa, 3375 FULLMASK, IPSEC_ULPROTO_ANY); 3376 if (!m) 3377 goto fail; 3378 break; 3379 3380 case SADB_EXT_KEY_AUTH: 3381 if (!sav->key_auth) 3382 continue; 3383 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3384 if (!m) 3385 goto fail; 3386 break; 3387 3388 case SADB_EXT_KEY_ENCRYPT: 3389 if (!sav->key_enc) 3390 continue; 3391 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3392 if (!m) 3393 goto fail; 3394 break; 3395 3396 case SADB_EXT_LIFETIME_CURRENT: 3397 if (!sav->lft_c) 3398 continue; 3399 m = key_setlifetime(sav->lft_c, 3400 SADB_EXT_LIFETIME_CURRENT); 3401 if (!m) 3402 goto fail; 3403 break; 3404 3405 case SADB_EXT_LIFETIME_HARD: 3406 if (!sav->lft_h) 3407 continue; 3408 m = key_setlifetime(sav->lft_h, 3409 SADB_EXT_LIFETIME_HARD); 3410 if (!m) 3411 goto fail; 3412 break; 3413 3414 case SADB_EXT_LIFETIME_SOFT: 3415 if (!sav->lft_s) 3416 continue; 3417 m = key_setlifetime(sav->lft_s, 3418 SADB_EXT_LIFETIME_SOFT); 3419 3420 if (!m) 3421 goto fail; 3422 break; 3423 3424 case SADB_EXT_ADDRESS_PROXY: 3425 case SADB_EXT_IDENTITY_SRC: 3426 case SADB_EXT_IDENTITY_DST: 3427 /* XXX: should we brought from SPD ? */ 3428 case SADB_EXT_SENSITIVITY: 3429 default: 3430 continue; 3431 } 3432 3433 if (!m) 3434 goto fail; 3435 if (tres) 3436 m_cat(m, tres); 3437 tres = m; 3438 3439 } 3440 3441 m_cat(result, tres); 3442 if (result->m_len < sizeof(struct sadb_msg)) { 3443 result = m_pullup(result, sizeof(struct sadb_msg)); 3444 if (result == NULL) 3445 goto fail; 3446 } 3447 3448 result->m_pkthdr.len = 0; 3449 for (m = result; m; m = m->m_next) 3450 result->m_pkthdr.len += m->m_len; 3451 3452 mtod(result, struct sadb_msg *)->sadb_msg_len = 3453 PFKEY_UNIT64(result->m_pkthdr.len); 3454 3455 return result; 3456 3457fail: 3458 m_freem(result); 3459 m_freem(tres); 3460 return NULL; 3461} 3462 3463/* 3464 * set data into sadb_msg. 3465 */ 3466static struct mbuf * 3467key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, u_int32_t seq, 3468 pid_t pid, u_int16_t reserved) 3469{ 3470 struct mbuf *m; 3471 struct sadb_msg *p; 3472 int len; 3473 3474 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3475 if (len > MCLBYTES) 3476 return NULL; 3477 MGETHDR(m, M_DONTWAIT, MT_DATA); 3478 if (m && len > MHLEN) { 3479 MCLGET(m, M_DONTWAIT); 3480 if ((m->m_flags & M_EXT) == 0) { 3481 m_freem(m); 3482 m = NULL; 3483 } 3484 } 3485 if (!m) 3486 return NULL; 3487 m->m_pkthdr.len = m->m_len = len; 3488 m->m_next = NULL; 3489 3490 p = mtod(m, struct sadb_msg *); 3491 3492 bzero(p, len); 3493 p->sadb_msg_version = PF_KEY_V2; 3494 p->sadb_msg_type = type; 3495 p->sadb_msg_errno = 0; 3496 p->sadb_msg_satype = satype; 3497 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3498 p->sadb_msg_reserved = reserved; 3499 p->sadb_msg_seq = seq; 3500 p->sadb_msg_pid = (u_int32_t)pid; 3501 3502 return m; 3503} 3504 3505/* 3506 * copy secasvar data into sadb_address. 3507 */ 3508static struct mbuf * 3509key_setsadbsa(sav) 3510 struct secasvar *sav; 3511{ 3512 struct mbuf *m; 3513 struct sadb_sa *p; 3514 int len; 3515 3516 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3517 m = key_alloc_mbuf(len); 3518 if (!m || m->m_next) { /*XXX*/ 3519 if (m) 3520 m_freem(m); 3521 return NULL; 3522 } 3523 3524 p = mtod(m, struct sadb_sa *); 3525 3526 bzero(p, len); 3527 p->sadb_sa_len = PFKEY_UNIT64(len); 3528 p->sadb_sa_exttype = SADB_EXT_SA; 3529 p->sadb_sa_spi = sav->spi; 3530 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3531 p->sadb_sa_state = sav->state; 3532 p->sadb_sa_auth = sav->alg_auth; 3533 p->sadb_sa_encrypt = sav->alg_enc; 3534 p->sadb_sa_flags = sav->flags; 3535 3536 return m; 3537} 3538 3539/* 3540 * set data into sadb_address. 3541 */ 3542static struct mbuf * 3543key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, u_int8_t prefixlen, u_int16_t ul_proto) 3544{ 3545 struct mbuf *m; 3546 struct sadb_address *p; 3547 size_t len; 3548 3549 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3550 PFKEY_ALIGN8(saddr->sa_len); 3551 m = key_alloc_mbuf(len); 3552 if (!m || m->m_next) { /*XXX*/ 3553 if (m) 3554 m_freem(m); 3555 return NULL; 3556 } 3557 3558 p = mtod(m, struct sadb_address *); 3559 3560 bzero(p, len); 3561 p->sadb_address_len = PFKEY_UNIT64(len); 3562 p->sadb_address_exttype = exttype; 3563 p->sadb_address_proto = ul_proto; 3564 if (prefixlen == FULLMASK) { 3565 switch (saddr->sa_family) { 3566 case AF_INET: 3567 prefixlen = sizeof(struct in_addr) << 3; 3568 break; 3569 case AF_INET6: 3570 prefixlen = sizeof(struct in6_addr) << 3; 3571 break; 3572 default: 3573 ; /*XXX*/ 3574 } 3575 } 3576 p->sadb_address_prefixlen = prefixlen; 3577 p->sadb_address_reserved = 0; 3578 3579 bcopy(saddr, 3580 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3581 saddr->sa_len); 3582 3583 return m; 3584} 3585 3586/* 3587 * set data into sadb_x_sa2. 3588 */ 3589static struct mbuf * 3590key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int32_t reqid) 3591{ 3592 struct mbuf *m; 3593 struct sadb_x_sa2 *p; 3594 size_t len; 3595 3596 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3597 m = key_alloc_mbuf(len); 3598 if (!m || m->m_next) { /*XXX*/ 3599 if (m) 3600 m_freem(m); 3601 return NULL; 3602 } 3603 3604 p = mtod(m, struct sadb_x_sa2 *); 3605 3606 bzero(p, len); 3607 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3608 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3609 p->sadb_x_sa2_mode = mode; 3610 p->sadb_x_sa2_reserved1 = 0; 3611 p->sadb_x_sa2_reserved2 = 0; 3612 p->sadb_x_sa2_sequence = seq; 3613 p->sadb_x_sa2_reqid = reqid; 3614 3615 return m; 3616} 3617 3618/* 3619 * set data into sadb_x_policy 3620 */ 3621static struct mbuf * 3622key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3623{ 3624 struct mbuf *m; 3625 struct sadb_x_policy *p; 3626 size_t len; 3627 3628 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3629 m = key_alloc_mbuf(len); 3630 if (!m || m->m_next) { /*XXX*/ 3631 if (m) 3632 m_freem(m); 3633 return NULL; 3634 } 3635 3636 p = mtod(m, struct sadb_x_policy *); 3637 3638 bzero(p, len); 3639 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3640 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3641 p->sadb_x_policy_type = type; 3642 p->sadb_x_policy_dir = dir; 3643 p->sadb_x_policy_id = id; 3644 3645 return m; 3646} 3647 3648/* %%% utilities */ 3649/* Take a key message (sadb_key) from the socket and turn it into one 3650 * of the kernel's key structures (seckey). 3651 * 3652 * IN: pointer to the src 3653 * OUT: NULL no more memory 3654 */ 3655struct seckey * 3656key_dup_keymsg(const struct sadb_key *src, u_int len, 3657 struct malloc_type *type) 3658{ 3659 INIT_VNET_IPSEC(curvnet); 3660 struct seckey *dst; 3661 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3662 if (dst != NULL) { 3663 dst->bits = src->sadb_key_bits; 3664 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3665 if (dst->key_data != NULL) { 3666 bcopy((const char *)src + sizeof(struct sadb_key), 3667 dst->key_data, len); 3668 } else { 3669 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3670 __func__)); 3671 free(dst, type); 3672 dst = NULL; 3673 } 3674 } else { 3675 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3676 __func__)); 3677 3678 } 3679 return dst; 3680} 3681 3682/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3683 * turn it into one of the kernel's lifetime structures (seclifetime). 3684 * 3685 * IN: pointer to the destination, source and malloc type 3686 * OUT: NULL, no more memory 3687 */ 3688 3689static struct seclifetime * 3690key_dup_lifemsg(const struct sadb_lifetime *src, 3691 struct malloc_type *type) 3692{ 3693 INIT_VNET_IPSEC(curvnet); 3694 struct seclifetime *dst = NULL; 3695 3696 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3697 type, M_NOWAIT); 3698 if (dst == NULL) { 3699 /* XXX counter */ 3700 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3701 } else { 3702 dst->allocations = src->sadb_lifetime_allocations; 3703 dst->bytes = src->sadb_lifetime_bytes; 3704 dst->addtime = src->sadb_lifetime_addtime; 3705 dst->usetime = src->sadb_lifetime_usetime; 3706 } 3707 return dst; 3708} 3709 3710/* compare my own address 3711 * OUT: 1: true, i.e. my address. 3712 * 0: false 3713 */ 3714int 3715key_ismyaddr(sa) 3716 struct sockaddr *sa; 3717{ 3718#ifdef INET 3719 INIT_VNET_INET(curvnet); 3720 struct sockaddr_in *sin; 3721 struct in_ifaddr *ia; 3722#endif 3723 3724 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3725 3726 switch (sa->sa_family) { 3727#ifdef INET 3728 case AF_INET: 3729 sin = (struct sockaddr_in *)sa; 3730 for (ia = V_in_ifaddrhead.tqh_first; ia; 3731 ia = ia->ia_link.tqe_next) 3732 { 3733 if (sin->sin_family == ia->ia_addr.sin_family && 3734 sin->sin_len == ia->ia_addr.sin_len && 3735 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3736 { 3737 return 1; 3738 } 3739 } 3740 break; 3741#endif 3742#ifdef INET6 3743 case AF_INET6: 3744 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3745#endif 3746 } 3747 3748 return 0; 3749} 3750 3751#ifdef INET6 3752/* 3753 * compare my own address for IPv6. 3754 * 1: ours 3755 * 0: other 3756 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3757 */ 3758#include <netinet6/in6_var.h> 3759 3760static int 3761key_ismyaddr6(sin6) 3762 struct sockaddr_in6 *sin6; 3763{ 3764 INIT_VNET_INET6(curvnet); 3765 struct in6_ifaddr *ia; 3766 struct in6_multi *in6m; 3767 3768 for (ia = V_in6_ifaddr; ia; ia = ia->ia_next) { 3769 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3770 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3771 return 1; 3772 3773 /* 3774 * XXX Multicast 3775 * XXX why do we care about multlicast here while we don't care 3776 * about IPv4 multicast?? 3777 * XXX scope 3778 */ 3779 in6m = NULL; 3780 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3781 if (in6m) 3782 return 1; 3783 } 3784 3785 /* loopback, just for safety */ 3786 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3787 return 1; 3788 3789 return 0; 3790} 3791#endif /*INET6*/ 3792 3793/* 3794 * compare two secasindex structure. 3795 * flag can specify to compare 2 saidxes. 3796 * compare two secasindex structure without both mode and reqid. 3797 * don't compare port. 3798 * IN: 3799 * saidx0: source, it can be in SAD. 3800 * saidx1: object. 3801 * OUT: 3802 * 1 : equal 3803 * 0 : not equal 3804 */ 3805static int 3806key_cmpsaidx( 3807 const struct secasindex *saidx0, 3808 const struct secasindex *saidx1, 3809 int flag) 3810{ 3811 /* sanity */ 3812 if (saidx0 == NULL && saidx1 == NULL) 3813 return 1; 3814 3815 if (saidx0 == NULL || saidx1 == NULL) 3816 return 0; 3817 3818 if (saidx0->proto != saidx1->proto) 3819 return 0; 3820 3821 if (flag == CMP_EXACTLY) { 3822 if (saidx0->mode != saidx1->mode) 3823 return 0; 3824 if (saidx0->reqid != saidx1->reqid) 3825 return 0; 3826 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3827 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3828 return 0; 3829 } else { 3830 3831 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3832 if (flag == CMP_MODE_REQID 3833 ||flag == CMP_REQID) { 3834 /* 3835 * If reqid of SPD is non-zero, unique SA is required. 3836 * The result must be of same reqid in this case. 3837 */ 3838 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3839 return 0; 3840 } 3841 3842 if (flag == CMP_MODE_REQID) { 3843 if (saidx0->mode != IPSEC_MODE_ANY 3844 && saidx0->mode != saidx1->mode) 3845 return 0; 3846 } 3847 3848 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3849 return 0; 3850 } 3851 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3852 return 0; 3853 } 3854 } 3855 3856 return 1; 3857} 3858 3859/* 3860 * compare two secindex structure exactly. 3861 * IN: 3862 * spidx0: source, it is often in SPD. 3863 * spidx1: object, it is often from PFKEY message. 3864 * OUT: 3865 * 1 : equal 3866 * 0 : not equal 3867 */ 3868static int 3869key_cmpspidx_exactly( 3870 struct secpolicyindex *spidx0, 3871 struct secpolicyindex *spidx1) 3872{ 3873 /* sanity */ 3874 if (spidx0 == NULL && spidx1 == NULL) 3875 return 1; 3876 3877 if (spidx0 == NULL || spidx1 == NULL) 3878 return 0; 3879 3880 if (spidx0->prefs != spidx1->prefs 3881 || spidx0->prefd != spidx1->prefd 3882 || spidx0->ul_proto != spidx1->ul_proto) 3883 return 0; 3884 3885 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3886 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3887} 3888 3889/* 3890 * compare two secindex structure with mask. 3891 * IN: 3892 * spidx0: source, it is often in SPD. 3893 * spidx1: object, it is often from IP header. 3894 * OUT: 3895 * 1 : equal 3896 * 0 : not equal 3897 */ 3898static int 3899key_cmpspidx_withmask( 3900 struct secpolicyindex *spidx0, 3901 struct secpolicyindex *spidx1) 3902{ 3903 /* sanity */ 3904 if (spidx0 == NULL && spidx1 == NULL) 3905 return 1; 3906 3907 if (spidx0 == NULL || spidx1 == NULL) 3908 return 0; 3909 3910 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3911 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3912 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3913 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3914 return 0; 3915 3916 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3917 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3918 && spidx0->ul_proto != spidx1->ul_proto) 3919 return 0; 3920 3921 switch (spidx0->src.sa.sa_family) { 3922 case AF_INET: 3923 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3924 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3925 return 0; 3926 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3927 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3928 return 0; 3929 break; 3930 case AF_INET6: 3931 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3932 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3933 return 0; 3934 /* 3935 * scope_id check. if sin6_scope_id is 0, we regard it 3936 * as a wildcard scope, which matches any scope zone ID. 3937 */ 3938 if (spidx0->src.sin6.sin6_scope_id && 3939 spidx1->src.sin6.sin6_scope_id && 3940 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3941 return 0; 3942 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3943 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3944 return 0; 3945 break; 3946 default: 3947 /* XXX */ 3948 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3949 return 0; 3950 break; 3951 } 3952 3953 switch (spidx0->dst.sa.sa_family) { 3954 case AF_INET: 3955 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3956 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3957 return 0; 3958 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3959 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3960 return 0; 3961 break; 3962 case AF_INET6: 3963 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3964 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3965 return 0; 3966 /* 3967 * scope_id check. if sin6_scope_id is 0, we regard it 3968 * as a wildcard scope, which matches any scope zone ID. 3969 */ 3970 if (spidx0->dst.sin6.sin6_scope_id && 3971 spidx1->dst.sin6.sin6_scope_id && 3972 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3973 return 0; 3974 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3975 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3976 return 0; 3977 break; 3978 default: 3979 /* XXX */ 3980 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3981 return 0; 3982 break; 3983 } 3984 3985 /* XXX Do we check other field ? e.g. flowinfo */ 3986 3987 return 1; 3988} 3989 3990/* returns 0 on match */ 3991static int 3992key_sockaddrcmp( 3993 const struct sockaddr *sa1, 3994 const struct sockaddr *sa2, 3995 int port) 3996{ 3997#ifdef satosin 3998#undef satosin 3999#endif 4000#define satosin(s) ((const struct sockaddr_in *)s) 4001#ifdef satosin6 4002#undef satosin6 4003#endif 4004#define satosin6(s) ((const struct sockaddr_in6 *)s) 4005 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 4006 return 1; 4007 4008 switch (sa1->sa_family) { 4009 case AF_INET: 4010 if (sa1->sa_len != sizeof(struct sockaddr_in)) 4011 return 1; 4012 if (satosin(sa1)->sin_addr.s_addr != 4013 satosin(sa2)->sin_addr.s_addr) { 4014 return 1; 4015 } 4016 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 4017 return 1; 4018 break; 4019 case AF_INET6: 4020 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4021 return 1; /*EINVAL*/ 4022 if (satosin6(sa1)->sin6_scope_id != 4023 satosin6(sa2)->sin6_scope_id) { 4024 return 1; 4025 } 4026 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4027 &satosin6(sa2)->sin6_addr)) { 4028 return 1; 4029 } 4030 if (port && 4031 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4032 return 1; 4033 } 4034 break; 4035 default: 4036 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4037 return 1; 4038 break; 4039 } 4040 4041 return 0; 4042#undef satosin 4043#undef satosin6 4044} 4045 4046/* 4047 * compare two buffers with mask. 4048 * IN: 4049 * addr1: source 4050 * addr2: object 4051 * bits: Number of bits to compare 4052 * OUT: 4053 * 1 : equal 4054 * 0 : not equal 4055 */ 4056static int 4057key_bbcmp(const void *a1, const void *a2, u_int bits) 4058{ 4059 const unsigned char *p1 = a1; 4060 const unsigned char *p2 = a2; 4061 4062 /* XXX: This could be considerably faster if we compare a word 4063 * at a time, but it is complicated on LSB Endian machines */ 4064 4065 /* Handle null pointers */ 4066 if (p1 == NULL || p2 == NULL) 4067 return (p1 == p2); 4068 4069 while (bits >= 8) { 4070 if (*p1++ != *p2++) 4071 return 0; 4072 bits -= 8; 4073 } 4074 4075 if (bits > 0) { 4076 u_int8_t mask = ~((1<<(8-bits))-1); 4077 if ((*p1 & mask) != (*p2 & mask)) 4078 return 0; 4079 } 4080 return 1; /* Match! */ 4081} 4082 4083static void 4084key_flush_spd(time_t now) 4085{ 4086 INIT_VNET_IPSEC(curvnet); 4087 static u_int16_t sptree_scangen = 0; 4088 u_int16_t gen = sptree_scangen++; 4089 struct secpolicy *sp; 4090 u_int dir; 4091 4092 /* SPD */ 4093 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4094restart: 4095 SPTREE_LOCK(); 4096 LIST_FOREACH(sp, &V_sptree[dir], chain) { 4097 if (sp->scangen == gen) /* previously handled */ 4098 continue; 4099 sp->scangen = gen; 4100 if (sp->state == IPSEC_SPSTATE_DEAD) { 4101 /* NB: clean entries created by key_spdflush */ 4102 SPTREE_UNLOCK(); 4103 KEY_FREESP(&sp); 4104 goto restart; 4105 } 4106 if (sp->lifetime == 0 && sp->validtime == 0) 4107 continue; 4108 if ((sp->lifetime && now - sp->created > sp->lifetime) 4109 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4110 sp->state = IPSEC_SPSTATE_DEAD; 4111 SPTREE_UNLOCK(); 4112 key_spdexpire(sp); 4113 KEY_FREESP(&sp); 4114 goto restart; 4115 } 4116 } 4117 SPTREE_UNLOCK(); 4118 } 4119} 4120 4121static void 4122key_flush_sad(time_t now) 4123{ 4124 INIT_VNET_IPSEC(curvnet); 4125 struct secashead *sah, *nextsah; 4126 struct secasvar *sav, *nextsav; 4127 4128 /* SAD */ 4129 SAHTREE_LOCK(); 4130 LIST_FOREACH_SAFE(sah, &V_sahtree, chain, nextsah) { 4131 /* if sah has been dead, then delete it and process next sah. */ 4132 if (sah->state == SADB_SASTATE_DEAD) { 4133 key_delsah(sah); 4134 continue; 4135 } 4136 4137 /* if LARVAL entry doesn't become MATURE, delete it. */ 4138 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4139 /* Need to also check refcnt for a larval SA ??? */ 4140 if (now - sav->created > V_key_larval_lifetime) 4141 KEY_FREESAV(&sav); 4142 } 4143 4144 /* 4145 * check MATURE entry to start to send expire message 4146 * whether or not. 4147 */ 4148 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4149 /* we don't need to check. */ 4150 if (sav->lft_s == NULL) 4151 continue; 4152 4153 /* sanity check */ 4154 if (sav->lft_c == NULL) { 4155 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4156 "time, why?\n", __func__)); 4157 continue; 4158 } 4159 4160 /* check SOFT lifetime */ 4161 if (sav->lft_s->addtime != 0 && 4162 now - sav->created > sav->lft_s->addtime) { 4163 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4164 /* 4165 * Actually, only send expire message if SA has been used, as it 4166 * was done before, but should we always send such message, and let IKE 4167 * daemon decide if it should be renegotiated or not ? 4168 * XXX expire message will actually NOT be sent if SA is only used 4169 * after soft lifetime has been reached, see below (DYING state) 4170 */ 4171 if (sav->lft_c->usetime != 0) 4172 key_expire(sav); 4173 } 4174 /* check SOFT lifetime by bytes */ 4175 /* 4176 * XXX I don't know the way to delete this SA 4177 * when new SA is installed. Caution when it's 4178 * installed too big lifetime by time. 4179 */ 4180 else if (sav->lft_s->bytes != 0 && 4181 sav->lft_s->bytes < sav->lft_c->bytes) { 4182 4183 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4184 /* 4185 * XXX If we keep to send expire 4186 * message in the status of 4187 * DYING. Do remove below code. 4188 */ 4189 key_expire(sav); 4190 } 4191 } 4192 4193 /* check DYING entry to change status to DEAD. */ 4194 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4195 /* we don't need to check. */ 4196 if (sav->lft_h == NULL) 4197 continue; 4198 4199 /* sanity check */ 4200 if (sav->lft_c == NULL) { 4201 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4202 "time, why?\n", __func__)); 4203 continue; 4204 } 4205 4206 if (sav->lft_h->addtime != 0 && 4207 now - sav->created > sav->lft_h->addtime) { 4208 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4209 KEY_FREESAV(&sav); 4210 } 4211#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4212 else if (sav->lft_s != NULL 4213 && sav->lft_s->addtime != 0 4214 && now - sav->created > sav->lft_s->addtime) { 4215 /* 4216 * XXX: should be checked to be 4217 * installed the valid SA. 4218 */ 4219 4220 /* 4221 * If there is no SA then sending 4222 * expire message. 4223 */ 4224 key_expire(sav); 4225 } 4226#endif 4227 /* check HARD lifetime by bytes */ 4228 else if (sav->lft_h->bytes != 0 && 4229 sav->lft_h->bytes < sav->lft_c->bytes) { 4230 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4231 KEY_FREESAV(&sav); 4232 } 4233 } 4234 4235 /* delete entry in DEAD */ 4236 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4237 /* sanity check */ 4238 if (sav->state != SADB_SASTATE_DEAD) { 4239 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4240 "(queue: %d SA: %d): kill it anyway\n", 4241 __func__, 4242 SADB_SASTATE_DEAD, sav->state)); 4243 } 4244 /* 4245 * do not call key_freesav() here. 4246 * sav should already be freed, and sav->refcnt 4247 * shows other references to sav 4248 * (such as from SPD). 4249 */ 4250 } 4251 } 4252 SAHTREE_UNLOCK(); 4253} 4254 4255static void 4256key_flush_acq(time_t now) 4257{ 4258 INIT_VNET_IPSEC(curvnet); 4259 struct secacq *acq, *nextacq; 4260 4261 /* ACQ tree */ 4262 ACQ_LOCK(); 4263 for (acq = LIST_FIRST(&V_acqtree); acq != NULL; acq = nextacq) { 4264 nextacq = LIST_NEXT(acq, chain); 4265 if (now - acq->created > V_key_blockacq_lifetime 4266 && __LIST_CHAINED(acq)) { 4267 LIST_REMOVE(acq, chain); 4268 free(acq, M_IPSEC_SAQ); 4269 } 4270 } 4271 ACQ_UNLOCK(); 4272} 4273 4274static void 4275key_flush_spacq(time_t now) 4276{ 4277 INIT_VNET_IPSEC(curvnet); 4278 struct secspacq *acq, *nextacq; 4279 4280 /* SP ACQ tree */ 4281 SPACQ_LOCK(); 4282 for (acq = LIST_FIRST(&V_spacqtree); acq != NULL; acq = nextacq) { 4283 nextacq = LIST_NEXT(acq, chain); 4284 if (now - acq->created > V_key_blockacq_lifetime 4285 && __LIST_CHAINED(acq)) { 4286 LIST_REMOVE(acq, chain); 4287 free(acq, M_IPSEC_SAQ); 4288 } 4289 } 4290 SPACQ_UNLOCK(); 4291} 4292 4293/* 4294 * time handler. 4295 * scanning SPD and SAD to check status for each entries, 4296 * and do to remove or to expire. 4297 * XXX: year 2038 problem may remain. 4298 */ 4299void 4300key_timehandler(void) 4301{ 4302 VNET_ITERATOR_DECL(vnet_iter); 4303 time_t now = time_second; 4304 4305 VNET_LIST_RLOCK(); 4306 VNET_FOREACH(vnet_iter) { 4307 CURVNET_SET(vnet_iter); 4308 key_flush_spd(now); 4309 key_flush_sad(now); 4310 key_flush_acq(now); 4311 key_flush_spacq(now); 4312 CURVNET_RESTORE(); 4313 } 4314 VNET_LIST_RUNLOCK(); 4315 4316#ifndef IPSEC_DEBUG2 4317 /* do exchange to tick time !! */ 4318 (void)timeout((void *)key_timehandler, (void *)0, hz); 4319#endif /* IPSEC_DEBUG2 */ 4320} 4321 4322u_long 4323key_random() 4324{ 4325 u_long value; 4326 4327 key_randomfill(&value, sizeof(value)); 4328 return value; 4329} 4330 4331void 4332key_randomfill(p, l) 4333 void *p; 4334 size_t l; 4335{ 4336 size_t n; 4337 u_long v; 4338 static int warn = 1; 4339 4340 n = 0; 4341 n = (size_t)read_random(p, (u_int)l); 4342 /* last resort */ 4343 while (n < l) { 4344 v = random(); 4345 bcopy(&v, (u_int8_t *)p + n, 4346 l - n < sizeof(v) ? l - n : sizeof(v)); 4347 n += sizeof(v); 4348 4349 if (warn) { 4350 printf("WARNING: pseudo-random number generator " 4351 "used for IPsec processing\n"); 4352 warn = 0; 4353 } 4354 } 4355} 4356 4357/* 4358 * map SADB_SATYPE_* to IPPROTO_*. 4359 * if satype == SADB_SATYPE then satype is mapped to ~0. 4360 * OUT: 4361 * 0: invalid satype. 4362 */ 4363static u_int16_t 4364key_satype2proto(u_int8_t satype) 4365{ 4366 switch (satype) { 4367 case SADB_SATYPE_UNSPEC: 4368 return IPSEC_PROTO_ANY; 4369 case SADB_SATYPE_AH: 4370 return IPPROTO_AH; 4371 case SADB_SATYPE_ESP: 4372 return IPPROTO_ESP; 4373 case SADB_X_SATYPE_IPCOMP: 4374 return IPPROTO_IPCOMP; 4375 case SADB_X_SATYPE_TCPSIGNATURE: 4376 return IPPROTO_TCP; 4377 default: 4378 return 0; 4379 } 4380 /* NOTREACHED */ 4381} 4382 4383/* 4384 * map IPPROTO_* to SADB_SATYPE_* 4385 * OUT: 4386 * 0: invalid protocol type. 4387 */ 4388static u_int8_t 4389key_proto2satype(u_int16_t proto) 4390{ 4391 switch (proto) { 4392 case IPPROTO_AH: 4393 return SADB_SATYPE_AH; 4394 case IPPROTO_ESP: 4395 return SADB_SATYPE_ESP; 4396 case IPPROTO_IPCOMP: 4397 return SADB_X_SATYPE_IPCOMP; 4398 case IPPROTO_TCP: 4399 return SADB_X_SATYPE_TCPSIGNATURE; 4400 default: 4401 return 0; 4402 } 4403 /* NOTREACHED */ 4404} 4405 4406/* %%% PF_KEY */ 4407/* 4408 * SADB_GETSPI processing is to receive 4409 * <base, (SA2), src address, dst address, (SPI range)> 4410 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4411 * tree with the status of LARVAL, and send 4412 * <base, SA(*), address(SD)> 4413 * to the IKMPd. 4414 * 4415 * IN: mhp: pointer to the pointer to each header. 4416 * OUT: NULL if fail. 4417 * other if success, return pointer to the message to send. 4418 */ 4419static int 4420key_getspi(so, m, mhp) 4421 struct socket *so; 4422 struct mbuf *m; 4423 const struct sadb_msghdr *mhp; 4424{ 4425 INIT_VNET_IPSEC(curvnet); 4426 struct sadb_address *src0, *dst0; 4427 struct secasindex saidx; 4428 struct secashead *newsah; 4429 struct secasvar *newsav; 4430 u_int8_t proto; 4431 u_int32_t spi; 4432 u_int8_t mode; 4433 u_int32_t reqid; 4434 int error; 4435 4436 IPSEC_ASSERT(so != NULL, ("null socket")); 4437 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4438 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4439 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4440 4441 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4442 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4443 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4444 __func__)); 4445 return key_senderror(so, m, EINVAL); 4446 } 4447 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4448 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4449 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4450 __func__)); 4451 return key_senderror(so, m, EINVAL); 4452 } 4453 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4454 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4455 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4456 } else { 4457 mode = IPSEC_MODE_ANY; 4458 reqid = 0; 4459 } 4460 4461 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4462 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4463 4464 /* map satype to proto */ 4465 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4466 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4467 __func__)); 4468 return key_senderror(so, m, EINVAL); 4469 } 4470 4471 /* make sure if port number is zero. */ 4472 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4473 case AF_INET: 4474 if (((struct sockaddr *)(src0 + 1))->sa_len != 4475 sizeof(struct sockaddr_in)) 4476 return key_senderror(so, m, EINVAL); 4477 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4478 break; 4479 case AF_INET6: 4480 if (((struct sockaddr *)(src0 + 1))->sa_len != 4481 sizeof(struct sockaddr_in6)) 4482 return key_senderror(so, m, EINVAL); 4483 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4484 break; 4485 default: 4486 ; /*???*/ 4487 } 4488 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4489 case AF_INET: 4490 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4491 sizeof(struct sockaddr_in)) 4492 return key_senderror(so, m, EINVAL); 4493 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4494 break; 4495 case AF_INET6: 4496 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4497 sizeof(struct sockaddr_in6)) 4498 return key_senderror(so, m, EINVAL); 4499 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4500 break; 4501 default: 4502 ; /*???*/ 4503 } 4504 4505 /* XXX boundary check against sa_len */ 4506 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4507 4508 /* SPI allocation */ 4509 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4510 &saidx); 4511 if (spi == 0) 4512 return key_senderror(so, m, EINVAL); 4513 4514 /* get a SA index */ 4515 if ((newsah = key_getsah(&saidx)) == NULL) { 4516 /* create a new SA index */ 4517 if ((newsah = key_newsah(&saidx)) == NULL) { 4518 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4519 return key_senderror(so, m, ENOBUFS); 4520 } 4521 } 4522 4523 /* get a new SA */ 4524 /* XXX rewrite */ 4525 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4526 if (newsav == NULL) { 4527 /* XXX don't free new SA index allocated in above. */ 4528 return key_senderror(so, m, error); 4529 } 4530 4531 /* set spi */ 4532 newsav->spi = htonl(spi); 4533 4534 /* delete the entry in acqtree */ 4535 if (mhp->msg->sadb_msg_seq != 0) { 4536 struct secacq *acq; 4537 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4538 /* reset counter in order to deletion by timehandler. */ 4539 acq->created = time_second; 4540 acq->count = 0; 4541 } 4542 } 4543 4544 { 4545 struct mbuf *n, *nn; 4546 struct sadb_sa *m_sa; 4547 struct sadb_msg *newmsg; 4548 int off, len; 4549 4550 /* create new sadb_msg to reply. */ 4551 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4552 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4553 4554 MGETHDR(n, M_DONTWAIT, MT_DATA); 4555 if (len > MHLEN) { 4556 MCLGET(n, M_DONTWAIT); 4557 if ((n->m_flags & M_EXT) == 0) { 4558 m_freem(n); 4559 n = NULL; 4560 } 4561 } 4562 if (!n) 4563 return key_senderror(so, m, ENOBUFS); 4564 4565 n->m_len = len; 4566 n->m_next = NULL; 4567 off = 0; 4568 4569 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4570 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4571 4572 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4573 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4574 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4575 m_sa->sadb_sa_spi = htonl(spi); 4576 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4577 4578 IPSEC_ASSERT(off == len, 4579 ("length inconsistency (off %u len %u)", off, len)); 4580 4581 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4582 SADB_EXT_ADDRESS_DST); 4583 if (!n->m_next) { 4584 m_freem(n); 4585 return key_senderror(so, m, ENOBUFS); 4586 } 4587 4588 if (n->m_len < sizeof(struct sadb_msg)) { 4589 n = m_pullup(n, sizeof(struct sadb_msg)); 4590 if (n == NULL) 4591 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4592 } 4593 4594 n->m_pkthdr.len = 0; 4595 for (nn = n; nn; nn = nn->m_next) 4596 n->m_pkthdr.len += nn->m_len; 4597 4598 newmsg = mtod(n, struct sadb_msg *); 4599 newmsg->sadb_msg_seq = newsav->seq; 4600 newmsg->sadb_msg_errno = 0; 4601 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4602 4603 m_freem(m); 4604 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4605 } 4606} 4607 4608/* 4609 * allocating new SPI 4610 * called by key_getspi(). 4611 * OUT: 4612 * 0: failure. 4613 * others: success. 4614 */ 4615static u_int32_t 4616key_do_getnewspi(spirange, saidx) 4617 struct sadb_spirange *spirange; 4618 struct secasindex *saidx; 4619{ 4620 INIT_VNET_IPSEC(curvnet); 4621 u_int32_t newspi; 4622 u_int32_t min, max; 4623 int count = V_key_spi_trycnt; 4624 4625 /* set spi range to allocate */ 4626 if (spirange != NULL) { 4627 min = spirange->sadb_spirange_min; 4628 max = spirange->sadb_spirange_max; 4629 } else { 4630 min = V_key_spi_minval; 4631 max = V_key_spi_maxval; 4632 } 4633 /* IPCOMP needs 2-byte SPI */ 4634 if (saidx->proto == IPPROTO_IPCOMP) { 4635 u_int32_t t; 4636 if (min >= 0x10000) 4637 min = 0xffff; 4638 if (max >= 0x10000) 4639 max = 0xffff; 4640 if (min > max) { 4641 t = min; min = max; max = t; 4642 } 4643 } 4644 4645 if (min == max) { 4646 if (key_checkspidup(saidx, min) != NULL) { 4647 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4648 __func__, min)); 4649 return 0; 4650 } 4651 4652 count--; /* taking one cost. */ 4653 newspi = min; 4654 4655 } else { 4656 4657 /* init SPI */ 4658 newspi = 0; 4659 4660 /* when requesting to allocate spi ranged */ 4661 while (count--) { 4662 /* generate pseudo-random SPI value ranged. */ 4663 newspi = min + (key_random() % (max - min + 1)); 4664 4665 if (key_checkspidup(saidx, newspi) == NULL) 4666 break; 4667 } 4668 4669 if (count == 0 || newspi == 0) { 4670 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4671 __func__)); 4672 return 0; 4673 } 4674 } 4675 4676 /* statistics */ 4677 keystat.getspi_count = 4678 (keystat.getspi_count + V_key_spi_trycnt - count) / 2; 4679 4680 return newspi; 4681} 4682 4683/* 4684 * SADB_UPDATE processing 4685 * receive 4686 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4687 * key(AE), (identity(SD),) (sensitivity)> 4688 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4689 * and send 4690 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4691 * (identity(SD),) (sensitivity)> 4692 * to the ikmpd. 4693 * 4694 * m will always be freed. 4695 */ 4696static int 4697key_update(so, m, mhp) 4698 struct socket *so; 4699 struct mbuf *m; 4700 const struct sadb_msghdr *mhp; 4701{ 4702 INIT_VNET_IPSEC(curvnet); 4703 struct sadb_sa *sa0; 4704 struct sadb_address *src0, *dst0; 4705 struct secasindex saidx; 4706 struct secashead *sah; 4707 struct secasvar *sav; 4708 u_int16_t proto; 4709 u_int8_t mode; 4710 u_int32_t reqid; 4711 int error; 4712 4713 IPSEC_ASSERT(so != NULL, ("null socket")); 4714 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4715 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4716 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4717 4718 /* map satype to proto */ 4719 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4720 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4721 __func__)); 4722 return key_senderror(so, m, EINVAL); 4723 } 4724 4725 if (mhp->ext[SADB_EXT_SA] == NULL || 4726 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4727 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4728 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4729 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4730 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4731 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4732 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4733 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4734 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4735 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4736 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4737 __func__)); 4738 return key_senderror(so, m, EINVAL); 4739 } 4740 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4741 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4742 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4743 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4744 __func__)); 4745 return key_senderror(so, m, EINVAL); 4746 } 4747 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4748 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4749 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4750 } else { 4751 mode = IPSEC_MODE_ANY; 4752 reqid = 0; 4753 } 4754 /* XXX boundary checking for other extensions */ 4755 4756 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4757 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4758 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4759 4760 /* XXX boundary check against sa_len */ 4761 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4762 4763 /* get a SA header */ 4764 if ((sah = key_getsah(&saidx)) == NULL) { 4765 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4766 return key_senderror(so, m, ENOENT); 4767 } 4768 4769 /* set spidx if there */ 4770 /* XXX rewrite */ 4771 error = key_setident(sah, m, mhp); 4772 if (error) 4773 return key_senderror(so, m, error); 4774 4775 /* find a SA with sequence number. */ 4776#ifdef IPSEC_DOSEQCHECK 4777 if (mhp->msg->sadb_msg_seq != 0 4778 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4779 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4780 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4781 return key_senderror(so, m, ENOENT); 4782 } 4783#else 4784 SAHTREE_LOCK(); 4785 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4786 SAHTREE_UNLOCK(); 4787 if (sav == NULL) { 4788 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4789 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4790 return key_senderror(so, m, EINVAL); 4791 } 4792#endif 4793 4794 /* validity check */ 4795 if (sav->sah->saidx.proto != proto) { 4796 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4797 "(DB=%u param=%u)\n", __func__, 4798 sav->sah->saidx.proto, proto)); 4799 return key_senderror(so, m, EINVAL); 4800 } 4801#ifdef IPSEC_DOSEQCHECK 4802 if (sav->spi != sa0->sadb_sa_spi) { 4803 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4804 __func__, 4805 (u_int32_t)ntohl(sav->spi), 4806 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4807 return key_senderror(so, m, EINVAL); 4808 } 4809#endif 4810 if (sav->pid != mhp->msg->sadb_msg_pid) { 4811 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4812 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4813 return key_senderror(so, m, EINVAL); 4814 } 4815 4816 /* copy sav values */ 4817 error = key_setsaval(sav, m, mhp); 4818 if (error) { 4819 KEY_FREESAV(&sav); 4820 return key_senderror(so, m, error); 4821 } 4822 4823 /* check SA values to be mature. */ 4824 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4825 KEY_FREESAV(&sav); 4826 return key_senderror(so, m, 0); 4827 } 4828 4829 { 4830 struct mbuf *n; 4831 4832 /* set msg buf from mhp */ 4833 n = key_getmsgbuf_x1(m, mhp); 4834 if (n == NULL) { 4835 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4836 return key_senderror(so, m, ENOBUFS); 4837 } 4838 4839 m_freem(m); 4840 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4841 } 4842} 4843 4844/* 4845 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4846 * only called by key_update(). 4847 * OUT: 4848 * NULL : not found 4849 * others : found, pointer to a SA. 4850 */ 4851#ifdef IPSEC_DOSEQCHECK 4852static struct secasvar * 4853key_getsavbyseq(sah, seq) 4854 struct secashead *sah; 4855 u_int32_t seq; 4856{ 4857 struct secasvar *sav; 4858 u_int state; 4859 4860 state = SADB_SASTATE_LARVAL; 4861 4862 /* search SAD with sequence number ? */ 4863 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4864 4865 KEY_CHKSASTATE(state, sav->state, __func__); 4866 4867 if (sav->seq == seq) { 4868 sa_addref(sav); 4869 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4870 printf("DP %s cause refcnt++:%d SA:%p\n", 4871 __func__, sav->refcnt, sav)); 4872 return sav; 4873 } 4874 } 4875 4876 return NULL; 4877} 4878#endif 4879 4880/* 4881 * SADB_ADD processing 4882 * add an entry to SA database, when received 4883 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4884 * key(AE), (identity(SD),) (sensitivity)> 4885 * from the ikmpd, 4886 * and send 4887 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4888 * (identity(SD),) (sensitivity)> 4889 * to the ikmpd. 4890 * 4891 * IGNORE identity and sensitivity messages. 4892 * 4893 * m will always be freed. 4894 */ 4895static int 4896key_add(so, m, mhp) 4897 struct socket *so; 4898 struct mbuf *m; 4899 const struct sadb_msghdr *mhp; 4900{ 4901 INIT_VNET_IPSEC(curvnet); 4902 struct sadb_sa *sa0; 4903 struct sadb_address *src0, *dst0; 4904 struct secasindex saidx; 4905 struct secashead *newsah; 4906 struct secasvar *newsav; 4907 u_int16_t proto; 4908 u_int8_t mode; 4909 u_int32_t reqid; 4910 int error; 4911 4912 IPSEC_ASSERT(so != NULL, ("null socket")); 4913 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4914 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4915 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4916 4917 /* map satype to proto */ 4918 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4919 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4920 __func__)); 4921 return key_senderror(so, m, EINVAL); 4922 } 4923 4924 if (mhp->ext[SADB_EXT_SA] == NULL || 4925 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4926 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4927 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4928 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4929 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4930 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4931 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4932 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4933 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4934 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4935 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4936 __func__)); 4937 return key_senderror(so, m, EINVAL); 4938 } 4939 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4940 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4941 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4942 /* XXX need more */ 4943 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4944 __func__)); 4945 return key_senderror(so, m, EINVAL); 4946 } 4947 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4948 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4949 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4950 } else { 4951 mode = IPSEC_MODE_ANY; 4952 reqid = 0; 4953 } 4954 4955 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4956 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4957 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4958 4959 /* XXX boundary check against sa_len */ 4960 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4961 4962 /* get a SA header */ 4963 if ((newsah = key_getsah(&saidx)) == NULL) { 4964 /* create a new SA header */ 4965 if ((newsah = key_newsah(&saidx)) == NULL) { 4966 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4967 return key_senderror(so, m, ENOBUFS); 4968 } 4969 } 4970 4971 /* set spidx if there */ 4972 /* XXX rewrite */ 4973 error = key_setident(newsah, m, mhp); 4974 if (error) { 4975 return key_senderror(so, m, error); 4976 } 4977 4978 /* create new SA entry. */ 4979 /* We can create new SA only if SPI is differenct. */ 4980 SAHTREE_LOCK(); 4981 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4982 SAHTREE_UNLOCK(); 4983 if (newsav != NULL) { 4984 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4985 return key_senderror(so, m, EEXIST); 4986 } 4987 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4988 if (newsav == NULL) { 4989 return key_senderror(so, m, error); 4990 } 4991 4992 /* check SA values to be mature. */ 4993 if ((error = key_mature(newsav)) != 0) { 4994 KEY_FREESAV(&newsav); 4995 return key_senderror(so, m, error); 4996 } 4997 4998 /* 4999 * don't call key_freesav() here, as we would like to keep the SA 5000 * in the database on success. 5001 */ 5002 5003 { 5004 struct mbuf *n; 5005 5006 /* set msg buf from mhp */ 5007 n = key_getmsgbuf_x1(m, mhp); 5008 if (n == NULL) { 5009 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5010 return key_senderror(so, m, ENOBUFS); 5011 } 5012 5013 m_freem(m); 5014 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5015 } 5016} 5017 5018/* m is retained */ 5019static int 5020key_setident(sah, m, mhp) 5021 struct secashead *sah; 5022 struct mbuf *m; 5023 const struct sadb_msghdr *mhp; 5024{ 5025 INIT_VNET_IPSEC(curvnet); 5026 const struct sadb_ident *idsrc, *iddst; 5027 int idsrclen, iddstlen; 5028 5029 IPSEC_ASSERT(sah != NULL, ("null secashead")); 5030 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5031 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5032 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5033 5034 /* don't make buffer if not there */ 5035 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5036 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5037 sah->idents = NULL; 5038 sah->identd = NULL; 5039 return 0; 5040 } 5041 5042 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5043 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5044 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5045 return EINVAL; 5046 } 5047 5048 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5049 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5050 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5051 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5052 5053 /* validity check */ 5054 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5055 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5056 return EINVAL; 5057 } 5058 5059 switch (idsrc->sadb_ident_type) { 5060 case SADB_IDENTTYPE_PREFIX: 5061 case SADB_IDENTTYPE_FQDN: 5062 case SADB_IDENTTYPE_USERFQDN: 5063 default: 5064 /* XXX do nothing */ 5065 sah->idents = NULL; 5066 sah->identd = NULL; 5067 return 0; 5068 } 5069 5070 /* make structure */ 5071 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5072 if (sah->idents == NULL) { 5073 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5074 return ENOBUFS; 5075 } 5076 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5077 if (sah->identd == NULL) { 5078 free(sah->idents, M_IPSEC_MISC); 5079 sah->idents = NULL; 5080 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5081 return ENOBUFS; 5082 } 5083 sah->idents->type = idsrc->sadb_ident_type; 5084 sah->idents->id = idsrc->sadb_ident_id; 5085 5086 sah->identd->type = iddst->sadb_ident_type; 5087 sah->identd->id = iddst->sadb_ident_id; 5088 5089 return 0; 5090} 5091 5092/* 5093 * m will not be freed on return. 5094 * it is caller's responsibility to free the result. 5095 */ 5096static struct mbuf * 5097key_getmsgbuf_x1(m, mhp) 5098 struct mbuf *m; 5099 const struct sadb_msghdr *mhp; 5100{ 5101 struct mbuf *n; 5102 5103 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5104 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5105 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5106 5107 /* create new sadb_msg to reply. */ 5108 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5109 SADB_EXT_SA, SADB_X_EXT_SA2, 5110 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5111 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5112 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5113 if (!n) 5114 return NULL; 5115 5116 if (n->m_len < sizeof(struct sadb_msg)) { 5117 n = m_pullup(n, sizeof(struct sadb_msg)); 5118 if (n == NULL) 5119 return NULL; 5120 } 5121 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5122 mtod(n, struct sadb_msg *)->sadb_msg_len = 5123 PFKEY_UNIT64(n->m_pkthdr.len); 5124 5125 return n; 5126} 5127 5128static int key_delete_all __P((struct socket *, struct mbuf *, 5129 const struct sadb_msghdr *, u_int16_t)); 5130 5131/* 5132 * SADB_DELETE processing 5133 * receive 5134 * <base, SA(*), address(SD)> 5135 * from the ikmpd, and set SADB_SASTATE_DEAD, 5136 * and send, 5137 * <base, SA(*), address(SD)> 5138 * to the ikmpd. 5139 * 5140 * m will always be freed. 5141 */ 5142static int 5143key_delete(so, m, mhp) 5144 struct socket *so; 5145 struct mbuf *m; 5146 const struct sadb_msghdr *mhp; 5147{ 5148 INIT_VNET_IPSEC(curvnet); 5149 struct sadb_sa *sa0; 5150 struct sadb_address *src0, *dst0; 5151 struct secasindex saidx; 5152 struct secashead *sah; 5153 struct secasvar *sav = NULL; 5154 u_int16_t proto; 5155 5156 IPSEC_ASSERT(so != NULL, ("null socket")); 5157 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5158 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5159 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5160 5161 /* map satype to proto */ 5162 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5163 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5164 __func__)); 5165 return key_senderror(so, m, EINVAL); 5166 } 5167 5168 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5169 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5170 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5171 __func__)); 5172 return key_senderror(so, m, EINVAL); 5173 } 5174 5175 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5176 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5177 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5178 __func__)); 5179 return key_senderror(so, m, EINVAL); 5180 } 5181 5182 if (mhp->ext[SADB_EXT_SA] == NULL) { 5183 /* 5184 * Caller wants us to delete all non-LARVAL SAs 5185 * that match the src/dst. This is used during 5186 * IKE INITIAL-CONTACT. 5187 */ 5188 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5189 return key_delete_all(so, m, mhp, proto); 5190 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5191 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5192 __func__)); 5193 return key_senderror(so, m, EINVAL); 5194 } 5195 5196 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5197 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5198 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5199 5200 /* XXX boundary check against sa_len */ 5201 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5202 5203 /* get a SA header */ 5204 SAHTREE_LOCK(); 5205 LIST_FOREACH(sah, &V_sahtree, chain) { 5206 if (sah->state == SADB_SASTATE_DEAD) 5207 continue; 5208 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5209 continue; 5210 5211 /* get a SA with SPI. */ 5212 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5213 if (sav) 5214 break; 5215 } 5216 if (sah == NULL) { 5217 SAHTREE_UNLOCK(); 5218 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5219 return key_senderror(so, m, ENOENT); 5220 } 5221 5222 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5223 SAHTREE_UNLOCK(); 5224 KEY_FREESAV(&sav); 5225 5226 { 5227 struct mbuf *n; 5228 struct sadb_msg *newmsg; 5229 5230 /* create new sadb_msg to reply. */ 5231 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5232 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5233 if (!n) 5234 return key_senderror(so, m, ENOBUFS); 5235 5236 if (n->m_len < sizeof(struct sadb_msg)) { 5237 n = m_pullup(n, sizeof(struct sadb_msg)); 5238 if (n == NULL) 5239 return key_senderror(so, m, ENOBUFS); 5240 } 5241 newmsg = mtod(n, struct sadb_msg *); 5242 newmsg->sadb_msg_errno = 0; 5243 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5244 5245 m_freem(m); 5246 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5247 } 5248} 5249 5250/* 5251 * delete all SAs for src/dst. Called from key_delete(). 5252 */ 5253static int 5254key_delete_all(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp, 5255 u_int16_t proto) 5256{ 5257 INIT_VNET_IPSEC(curvnet); 5258 struct sadb_address *src0, *dst0; 5259 struct secasindex saidx; 5260 struct secashead *sah; 5261 struct secasvar *sav, *nextsav; 5262 u_int stateidx, state; 5263 5264 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5265 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5266 5267 /* XXX boundary check against sa_len */ 5268 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5269 5270 SAHTREE_LOCK(); 5271 LIST_FOREACH(sah, &V_sahtree, chain) { 5272 if (sah->state == SADB_SASTATE_DEAD) 5273 continue; 5274 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5275 continue; 5276 5277 /* Delete all non-LARVAL SAs. */ 5278 for (stateidx = 0; 5279 stateidx < _ARRAYLEN(saorder_state_alive); 5280 stateidx++) { 5281 state = saorder_state_alive[stateidx]; 5282 if (state == SADB_SASTATE_LARVAL) 5283 continue; 5284 for (sav = LIST_FIRST(&sah->savtree[state]); 5285 sav != NULL; sav = nextsav) { 5286 nextsav = LIST_NEXT(sav, chain); 5287 /* sanity check */ 5288 if (sav->state != state) { 5289 ipseclog((LOG_DEBUG, "%s: invalid " 5290 "sav->state (queue %d SA %d)\n", 5291 __func__, state, sav->state)); 5292 continue; 5293 } 5294 5295 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5296 KEY_FREESAV(&sav); 5297 } 5298 } 5299 } 5300 SAHTREE_UNLOCK(); 5301 { 5302 struct mbuf *n; 5303 struct sadb_msg *newmsg; 5304 5305 /* create new sadb_msg to reply. */ 5306 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5307 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5308 if (!n) 5309 return key_senderror(so, m, ENOBUFS); 5310 5311 if (n->m_len < sizeof(struct sadb_msg)) { 5312 n = m_pullup(n, sizeof(struct sadb_msg)); 5313 if (n == NULL) 5314 return key_senderror(so, m, ENOBUFS); 5315 } 5316 newmsg = mtod(n, struct sadb_msg *); 5317 newmsg->sadb_msg_errno = 0; 5318 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5319 5320 m_freem(m); 5321 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5322 } 5323} 5324 5325/* 5326 * SADB_GET processing 5327 * receive 5328 * <base, SA(*), address(SD)> 5329 * from the ikmpd, and get a SP and a SA to respond, 5330 * and send, 5331 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5332 * (identity(SD),) (sensitivity)> 5333 * to the ikmpd. 5334 * 5335 * m will always be freed. 5336 */ 5337static int 5338key_get(so, m, mhp) 5339 struct socket *so; 5340 struct mbuf *m; 5341 const struct sadb_msghdr *mhp; 5342{ 5343 INIT_VNET_IPSEC(curvnet); 5344 struct sadb_sa *sa0; 5345 struct sadb_address *src0, *dst0; 5346 struct secasindex saidx; 5347 struct secashead *sah; 5348 struct secasvar *sav = NULL; 5349 u_int16_t proto; 5350 5351 IPSEC_ASSERT(so != NULL, ("null socket")); 5352 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5353 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5354 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5355 5356 /* map satype to proto */ 5357 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5358 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5359 __func__)); 5360 return key_senderror(so, m, EINVAL); 5361 } 5362 5363 if (mhp->ext[SADB_EXT_SA] == NULL || 5364 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5365 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5366 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5367 __func__)); 5368 return key_senderror(so, m, EINVAL); 5369 } 5370 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5371 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5372 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5373 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5374 __func__)); 5375 return key_senderror(so, m, EINVAL); 5376 } 5377 5378 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5379 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5380 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5381 5382 /* XXX boundary check against sa_len */ 5383 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5384 5385 /* get a SA header */ 5386 SAHTREE_LOCK(); 5387 LIST_FOREACH(sah, &V_sahtree, chain) { 5388 if (sah->state == SADB_SASTATE_DEAD) 5389 continue; 5390 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5391 continue; 5392 5393 /* get a SA with SPI. */ 5394 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5395 if (sav) 5396 break; 5397 } 5398 SAHTREE_UNLOCK(); 5399 if (sah == NULL) { 5400 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5401 return key_senderror(so, m, ENOENT); 5402 } 5403 5404 { 5405 struct mbuf *n; 5406 u_int8_t satype; 5407 5408 /* map proto to satype */ 5409 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5410 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5411 __func__)); 5412 return key_senderror(so, m, EINVAL); 5413 } 5414 5415 /* create new sadb_msg to reply. */ 5416 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5417 mhp->msg->sadb_msg_pid); 5418 if (!n) 5419 return key_senderror(so, m, ENOBUFS); 5420 5421 m_freem(m); 5422 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5423 } 5424} 5425 5426/* XXX make it sysctl-configurable? */ 5427static void 5428key_getcomb_setlifetime(comb) 5429 struct sadb_comb *comb; 5430{ 5431 5432 comb->sadb_comb_soft_allocations = 1; 5433 comb->sadb_comb_hard_allocations = 1; 5434 comb->sadb_comb_soft_bytes = 0; 5435 comb->sadb_comb_hard_bytes = 0; 5436 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5437 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5438 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5439 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5440} 5441 5442/* 5443 * XXX reorder combinations by preference 5444 * XXX no idea if the user wants ESP authentication or not 5445 */ 5446static struct mbuf * 5447key_getcomb_esp() 5448{ 5449 INIT_VNET_IPSEC(curvnet); 5450 struct sadb_comb *comb; 5451 struct enc_xform *algo; 5452 struct mbuf *result = NULL, *m, *n; 5453 int encmin; 5454 int i, off, o; 5455 int totlen; 5456 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5457 5458 m = NULL; 5459 for (i = 1; i <= SADB_EALG_MAX; i++) { 5460 algo = esp_algorithm_lookup(i); 5461 if (algo == NULL) 5462 continue; 5463 5464 /* discard algorithms with key size smaller than system min */ 5465 if (_BITS(algo->maxkey) < V_ipsec_esp_keymin) 5466 continue; 5467 if (_BITS(algo->minkey) < V_ipsec_esp_keymin) 5468 encmin = V_ipsec_esp_keymin; 5469 else 5470 encmin = _BITS(algo->minkey); 5471 5472 if (V_ipsec_esp_auth) 5473 m = key_getcomb_ah(); 5474 else { 5475 IPSEC_ASSERT(l <= MLEN, 5476 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5477 MGET(m, M_DONTWAIT, MT_DATA); 5478 if (m) { 5479 M_ALIGN(m, l); 5480 m->m_len = l; 5481 m->m_next = NULL; 5482 bzero(mtod(m, caddr_t), m->m_len); 5483 } 5484 } 5485 if (!m) 5486 goto fail; 5487 5488 totlen = 0; 5489 for (n = m; n; n = n->m_next) 5490 totlen += n->m_len; 5491 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5492 5493 for (off = 0; off < totlen; off += l) { 5494 n = m_pulldown(m, off, l, &o); 5495 if (!n) { 5496 /* m is already freed */ 5497 goto fail; 5498 } 5499 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5500 bzero(comb, sizeof(*comb)); 5501 key_getcomb_setlifetime(comb); 5502 comb->sadb_comb_encrypt = i; 5503 comb->sadb_comb_encrypt_minbits = encmin; 5504 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5505 } 5506 5507 if (!result) 5508 result = m; 5509 else 5510 m_cat(result, m); 5511 } 5512 5513 return result; 5514 5515 fail: 5516 if (result) 5517 m_freem(result); 5518 return NULL; 5519} 5520 5521static void 5522key_getsizes_ah( 5523 const struct auth_hash *ah, 5524 int alg, 5525 u_int16_t* min, 5526 u_int16_t* max) 5527{ 5528 INIT_VNET_IPSEC(curvnet); 5529 5530 *min = *max = ah->keysize; 5531 if (ah->keysize == 0) { 5532 /* 5533 * Transform takes arbitrary key size but algorithm 5534 * key size is restricted. Enforce this here. 5535 */ 5536 switch (alg) { 5537 case SADB_X_AALG_MD5: *min = *max = 16; break; 5538 case SADB_X_AALG_SHA: *min = *max = 20; break; 5539 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5540 default: 5541 DPRINTF(("%s: unknown AH algorithm %u\n", 5542 __func__, alg)); 5543 break; 5544 } 5545 } 5546} 5547 5548/* 5549 * XXX reorder combinations by preference 5550 */ 5551static struct mbuf * 5552key_getcomb_ah() 5553{ 5554 INIT_VNET_IPSEC(curvnet); 5555 struct sadb_comb *comb; 5556 struct auth_hash *algo; 5557 struct mbuf *m; 5558 u_int16_t minkeysize, maxkeysize; 5559 int i; 5560 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5561 5562 m = NULL; 5563 for (i = 1; i <= SADB_AALG_MAX; i++) { 5564#if 1 5565 /* we prefer HMAC algorithms, not old algorithms */ 5566 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5567 continue; 5568#endif 5569 algo = ah_algorithm_lookup(i); 5570 if (!algo) 5571 continue; 5572 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5573 /* discard algorithms with key size smaller than system min */ 5574 if (_BITS(minkeysize) < V_ipsec_ah_keymin) 5575 continue; 5576 5577 if (!m) { 5578 IPSEC_ASSERT(l <= MLEN, 5579 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5580 MGET(m, M_DONTWAIT, MT_DATA); 5581 if (m) { 5582 M_ALIGN(m, l); 5583 m->m_len = l; 5584 m->m_next = NULL; 5585 } 5586 } else 5587 M_PREPEND(m, l, M_DONTWAIT); 5588 if (!m) 5589 return NULL; 5590 5591 comb = mtod(m, struct sadb_comb *); 5592 bzero(comb, sizeof(*comb)); 5593 key_getcomb_setlifetime(comb); 5594 comb->sadb_comb_auth = i; 5595 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5596 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5597 } 5598 5599 return m; 5600} 5601 5602/* 5603 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5604 * XXX reorder combinations by preference 5605 */ 5606static struct mbuf * 5607key_getcomb_ipcomp() 5608{ 5609 struct sadb_comb *comb; 5610 struct comp_algo *algo; 5611 struct mbuf *m; 5612 int i; 5613 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5614 5615 m = NULL; 5616 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5617 algo = ipcomp_algorithm_lookup(i); 5618 if (!algo) 5619 continue; 5620 5621 if (!m) { 5622 IPSEC_ASSERT(l <= MLEN, 5623 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5624 MGET(m, M_DONTWAIT, MT_DATA); 5625 if (m) { 5626 M_ALIGN(m, l); 5627 m->m_len = l; 5628 m->m_next = NULL; 5629 } 5630 } else 5631 M_PREPEND(m, l, M_DONTWAIT); 5632 if (!m) 5633 return NULL; 5634 5635 comb = mtod(m, struct sadb_comb *); 5636 bzero(comb, sizeof(*comb)); 5637 key_getcomb_setlifetime(comb); 5638 comb->sadb_comb_encrypt = i; 5639 /* what should we set into sadb_comb_*_{min,max}bits? */ 5640 } 5641 5642 return m; 5643} 5644 5645/* 5646 * XXX no way to pass mode (transport/tunnel) to userland 5647 * XXX replay checking? 5648 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5649 */ 5650static struct mbuf * 5651key_getprop(saidx) 5652 const struct secasindex *saidx; 5653{ 5654 struct sadb_prop *prop; 5655 struct mbuf *m, *n; 5656 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5657 int totlen; 5658 5659 switch (saidx->proto) { 5660 case IPPROTO_ESP: 5661 m = key_getcomb_esp(); 5662 break; 5663 case IPPROTO_AH: 5664 m = key_getcomb_ah(); 5665 break; 5666 case IPPROTO_IPCOMP: 5667 m = key_getcomb_ipcomp(); 5668 break; 5669 default: 5670 return NULL; 5671 } 5672 5673 if (!m) 5674 return NULL; 5675 M_PREPEND(m, l, M_DONTWAIT); 5676 if (!m) 5677 return NULL; 5678 5679 totlen = 0; 5680 for (n = m; n; n = n->m_next) 5681 totlen += n->m_len; 5682 5683 prop = mtod(m, struct sadb_prop *); 5684 bzero(prop, sizeof(*prop)); 5685 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5686 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5687 prop->sadb_prop_replay = 32; /* XXX */ 5688 5689 return m; 5690} 5691 5692/* 5693 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5694 * send 5695 * <base, SA, address(SD), (address(P)), x_policy, 5696 * (identity(SD),) (sensitivity,) proposal> 5697 * to KMD, and expect to receive 5698 * <base> with SADB_ACQUIRE if error occured, 5699 * or 5700 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5701 * from KMD by PF_KEY. 5702 * 5703 * XXX x_policy is outside of RFC2367 (KAME extension). 5704 * XXX sensitivity is not supported. 5705 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5706 * see comment for key_getcomb_ipcomp(). 5707 * 5708 * OUT: 5709 * 0 : succeed 5710 * others: error number 5711 */ 5712static int 5713key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5714{ 5715 INIT_VNET_IPSEC(curvnet); 5716 struct mbuf *result = NULL, *m; 5717 struct secacq *newacq; 5718 u_int8_t satype; 5719 int error = -1; 5720 u_int32_t seq; 5721 5722 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5723 satype = key_proto2satype(saidx->proto); 5724 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5725 5726 /* 5727 * We never do anything about acquirng SA. There is anather 5728 * solution that kernel blocks to send SADB_ACQUIRE message until 5729 * getting something message from IKEd. In later case, to be 5730 * managed with ACQUIRING list. 5731 */ 5732 /* Get an entry to check whether sending message or not. */ 5733 if ((newacq = key_getacq(saidx)) != NULL) { 5734 if (V_key_blockacq_count < newacq->count) { 5735 /* reset counter and do send message. */ 5736 newacq->count = 0; 5737 } else { 5738 /* increment counter and do nothing. */ 5739 newacq->count++; 5740 return 0; 5741 } 5742 } else { 5743 /* make new entry for blocking to send SADB_ACQUIRE. */ 5744 if ((newacq = key_newacq(saidx)) == NULL) 5745 return ENOBUFS; 5746 } 5747 5748 5749 seq = newacq->seq; 5750 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5751 if (!m) { 5752 error = ENOBUFS; 5753 goto fail; 5754 } 5755 result = m; 5756 5757 /* set sadb_address for saidx's. */ 5758 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5759 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5760 if (!m) { 5761 error = ENOBUFS; 5762 goto fail; 5763 } 5764 m_cat(result, m); 5765 5766 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5767 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5768 if (!m) { 5769 error = ENOBUFS; 5770 goto fail; 5771 } 5772 m_cat(result, m); 5773 5774 /* XXX proxy address (optional) */ 5775 5776 /* set sadb_x_policy */ 5777 if (sp) { 5778 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5779 if (!m) { 5780 error = ENOBUFS; 5781 goto fail; 5782 } 5783 m_cat(result, m); 5784 } 5785 5786 /* XXX identity (optional) */ 5787#if 0 5788 if (idexttype && fqdn) { 5789 /* create identity extension (FQDN) */ 5790 struct sadb_ident *id; 5791 int fqdnlen; 5792 5793 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5794 id = (struct sadb_ident *)p; 5795 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5796 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5797 id->sadb_ident_exttype = idexttype; 5798 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5799 bcopy(fqdn, id + 1, fqdnlen); 5800 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5801 } 5802 5803 if (idexttype) { 5804 /* create identity extension (USERFQDN) */ 5805 struct sadb_ident *id; 5806 int userfqdnlen; 5807 5808 if (userfqdn) { 5809 /* +1 for terminating-NUL */ 5810 userfqdnlen = strlen(userfqdn) + 1; 5811 } else 5812 userfqdnlen = 0; 5813 id = (struct sadb_ident *)p; 5814 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5815 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5816 id->sadb_ident_exttype = idexttype; 5817 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5818 /* XXX is it correct? */ 5819 if (curproc && curproc->p_cred) 5820 id->sadb_ident_id = curproc->p_cred->p_ruid; 5821 if (userfqdn && userfqdnlen) 5822 bcopy(userfqdn, id + 1, userfqdnlen); 5823 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5824 } 5825#endif 5826 5827 /* XXX sensitivity (optional) */ 5828 5829 /* create proposal/combination extension */ 5830 m = key_getprop(saidx); 5831#if 0 5832 /* 5833 * spec conformant: always attach proposal/combination extension, 5834 * the problem is that we have no way to attach it for ipcomp, 5835 * due to the way sadb_comb is declared in RFC2367. 5836 */ 5837 if (!m) { 5838 error = ENOBUFS; 5839 goto fail; 5840 } 5841 m_cat(result, m); 5842#else 5843 /* 5844 * outside of spec; make proposal/combination extension optional. 5845 */ 5846 if (m) 5847 m_cat(result, m); 5848#endif 5849 5850 if ((result->m_flags & M_PKTHDR) == 0) { 5851 error = EINVAL; 5852 goto fail; 5853 } 5854 5855 if (result->m_len < sizeof(struct sadb_msg)) { 5856 result = m_pullup(result, sizeof(struct sadb_msg)); 5857 if (result == NULL) { 5858 error = ENOBUFS; 5859 goto fail; 5860 } 5861 } 5862 5863 result->m_pkthdr.len = 0; 5864 for (m = result; m; m = m->m_next) 5865 result->m_pkthdr.len += m->m_len; 5866 5867 mtod(result, struct sadb_msg *)->sadb_msg_len = 5868 PFKEY_UNIT64(result->m_pkthdr.len); 5869 5870 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5871 5872 fail: 5873 if (result) 5874 m_freem(result); 5875 return error; 5876} 5877 5878static struct secacq * 5879key_newacq(const struct secasindex *saidx) 5880{ 5881 INIT_VNET_IPSEC(curvnet); 5882 struct secacq *newacq; 5883 5884 /* get new entry */ 5885 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5886 if (newacq == NULL) { 5887 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5888 return NULL; 5889 } 5890 5891 /* copy secindex */ 5892 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5893 newacq->seq = (V_acq_seq == ~0 ? 1 : ++V_acq_seq); 5894 newacq->created = time_second; 5895 newacq->count = 0; 5896 5897 /* add to acqtree */ 5898 ACQ_LOCK(); 5899 LIST_INSERT_HEAD(&V_acqtree, newacq, chain); 5900 ACQ_UNLOCK(); 5901 5902 return newacq; 5903} 5904 5905static struct secacq * 5906key_getacq(const struct secasindex *saidx) 5907{ 5908 INIT_VNET_IPSEC(curvnet); 5909 struct secacq *acq; 5910 5911 ACQ_LOCK(); 5912 LIST_FOREACH(acq, &V_acqtree, chain) { 5913 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5914 break; 5915 } 5916 ACQ_UNLOCK(); 5917 5918 return acq; 5919} 5920 5921static struct secacq * 5922key_getacqbyseq(seq) 5923 u_int32_t seq; 5924{ 5925 INIT_VNET_IPSEC(curvnet); 5926 struct secacq *acq; 5927 5928 ACQ_LOCK(); 5929 LIST_FOREACH(acq, &V_acqtree, chain) { 5930 if (acq->seq == seq) 5931 break; 5932 } 5933 ACQ_UNLOCK(); 5934 5935 return acq; 5936} 5937 5938static struct secspacq * 5939key_newspacq(spidx) 5940 struct secpolicyindex *spidx; 5941{ 5942 INIT_VNET_IPSEC(curvnet); 5943 struct secspacq *acq; 5944 5945 /* get new entry */ 5946 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5947 if (acq == NULL) { 5948 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5949 return NULL; 5950 } 5951 5952 /* copy secindex */ 5953 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5954 acq->created = time_second; 5955 acq->count = 0; 5956 5957 /* add to spacqtree */ 5958 SPACQ_LOCK(); 5959 LIST_INSERT_HEAD(&V_spacqtree, acq, chain); 5960 SPACQ_UNLOCK(); 5961 5962 return acq; 5963} 5964 5965static struct secspacq * 5966key_getspacq(spidx) 5967 struct secpolicyindex *spidx; 5968{ 5969 INIT_VNET_IPSEC(curvnet); 5970 struct secspacq *acq; 5971 5972 SPACQ_LOCK(); 5973 LIST_FOREACH(acq, &V_spacqtree, chain) { 5974 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5975 /* NB: return holding spacq_lock */ 5976 return acq; 5977 } 5978 } 5979 SPACQ_UNLOCK(); 5980 5981 return NULL; 5982} 5983 5984/* 5985 * SADB_ACQUIRE processing, 5986 * in first situation, is receiving 5987 * <base> 5988 * from the ikmpd, and clear sequence of its secasvar entry. 5989 * 5990 * In second situation, is receiving 5991 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5992 * from a user land process, and return 5993 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5994 * to the socket. 5995 * 5996 * m will always be freed. 5997 */ 5998static int 5999key_acquire2(so, m, mhp) 6000 struct socket *so; 6001 struct mbuf *m; 6002 const struct sadb_msghdr *mhp; 6003{ 6004 INIT_VNET_IPSEC(curvnet); 6005 const struct sadb_address *src0, *dst0; 6006 struct secasindex saidx; 6007 struct secashead *sah; 6008 u_int16_t proto; 6009 int error; 6010 6011 IPSEC_ASSERT(so != NULL, ("null socket")); 6012 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6013 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6014 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6015 6016 /* 6017 * Error message from KMd. 6018 * We assume that if error was occured in IKEd, the length of PFKEY 6019 * message is equal to the size of sadb_msg structure. 6020 * We do not raise error even if error occured in this function. 6021 */ 6022 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6023 struct secacq *acq; 6024 6025 /* check sequence number */ 6026 if (mhp->msg->sadb_msg_seq == 0) { 6027 ipseclog((LOG_DEBUG, "%s: must specify sequence " 6028 "number.\n", __func__)); 6029 m_freem(m); 6030 return 0; 6031 } 6032 6033 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 6034 /* 6035 * the specified larval SA is already gone, or we got 6036 * a bogus sequence number. we can silently ignore it. 6037 */ 6038 m_freem(m); 6039 return 0; 6040 } 6041 6042 /* reset acq counter in order to deletion by timehander. */ 6043 acq->created = time_second; 6044 acq->count = 0; 6045 m_freem(m); 6046 return 0; 6047 } 6048 6049 /* 6050 * This message is from user land. 6051 */ 6052 6053 /* map satype to proto */ 6054 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6055 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6056 __func__)); 6057 return key_senderror(so, m, EINVAL); 6058 } 6059 6060 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6061 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6062 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6063 /* error */ 6064 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6065 __func__)); 6066 return key_senderror(so, m, EINVAL); 6067 } 6068 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6069 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6070 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6071 /* error */ 6072 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6073 __func__)); 6074 return key_senderror(so, m, EINVAL); 6075 } 6076 6077 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6078 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6079 6080 /* XXX boundary check against sa_len */ 6081 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6082 6083 /* get a SA index */ 6084 SAHTREE_LOCK(); 6085 LIST_FOREACH(sah, &V_sahtree, chain) { 6086 if (sah->state == SADB_SASTATE_DEAD) 6087 continue; 6088 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6089 break; 6090 } 6091 SAHTREE_UNLOCK(); 6092 if (sah != NULL) { 6093 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6094 return key_senderror(so, m, EEXIST); 6095 } 6096 6097 error = key_acquire(&saidx, NULL); 6098 if (error != 0) { 6099 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6100 __func__, mhp->msg->sadb_msg_errno)); 6101 return key_senderror(so, m, error); 6102 } 6103 6104 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6105} 6106 6107/* 6108 * SADB_REGISTER processing. 6109 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6110 * receive 6111 * <base> 6112 * from the ikmpd, and register a socket to send PF_KEY messages, 6113 * and send 6114 * <base, supported> 6115 * to KMD by PF_KEY. 6116 * If socket is detached, must free from regnode. 6117 * 6118 * m will always be freed. 6119 */ 6120static int 6121key_register(so, m, mhp) 6122 struct socket *so; 6123 struct mbuf *m; 6124 const struct sadb_msghdr *mhp; 6125{ 6126 INIT_VNET_IPSEC(curvnet); 6127 struct secreg *reg, *newreg = 0; 6128 6129 IPSEC_ASSERT(so != NULL, ("null socket")); 6130 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6131 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6132 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6133 6134 /* check for invalid register message */ 6135 if (mhp->msg->sadb_msg_satype >= sizeof(V_regtree)/sizeof(V_regtree[0])) 6136 return key_senderror(so, m, EINVAL); 6137 6138 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6139 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6140 goto setmsg; 6141 6142 /* check whether existing or not */ 6143 REGTREE_LOCK(); 6144 LIST_FOREACH(reg, &V_regtree[mhp->msg->sadb_msg_satype], chain) { 6145 if (reg->so == so) { 6146 REGTREE_UNLOCK(); 6147 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6148 __func__)); 6149 return key_senderror(so, m, EEXIST); 6150 } 6151 } 6152 6153 /* create regnode */ 6154 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6155 if (newreg == NULL) { 6156 REGTREE_UNLOCK(); 6157 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6158 return key_senderror(so, m, ENOBUFS); 6159 } 6160 6161 newreg->so = so; 6162 ((struct keycb *)sotorawcb(so))->kp_registered++; 6163 6164 /* add regnode to regtree. */ 6165 LIST_INSERT_HEAD(&V_regtree[mhp->msg->sadb_msg_satype], newreg, chain); 6166 REGTREE_UNLOCK(); 6167 6168 setmsg: 6169 { 6170 struct mbuf *n; 6171 struct sadb_msg *newmsg; 6172 struct sadb_supported *sup; 6173 u_int len, alen, elen; 6174 int off; 6175 int i; 6176 struct sadb_alg *alg; 6177 6178 /* create new sadb_msg to reply. */ 6179 alen = 0; 6180 for (i = 1; i <= SADB_AALG_MAX; i++) { 6181 if (ah_algorithm_lookup(i)) 6182 alen += sizeof(struct sadb_alg); 6183 } 6184 if (alen) 6185 alen += sizeof(struct sadb_supported); 6186 elen = 0; 6187 for (i = 1; i <= SADB_EALG_MAX; i++) { 6188 if (esp_algorithm_lookup(i)) 6189 elen += sizeof(struct sadb_alg); 6190 } 6191 if (elen) 6192 elen += sizeof(struct sadb_supported); 6193 6194 len = sizeof(struct sadb_msg) + alen + elen; 6195 6196 if (len > MCLBYTES) 6197 return key_senderror(so, m, ENOBUFS); 6198 6199 MGETHDR(n, M_DONTWAIT, MT_DATA); 6200 if (len > MHLEN) { 6201 MCLGET(n, M_DONTWAIT); 6202 if ((n->m_flags & M_EXT) == 0) { 6203 m_freem(n); 6204 n = NULL; 6205 } 6206 } 6207 if (!n) 6208 return key_senderror(so, m, ENOBUFS); 6209 6210 n->m_pkthdr.len = n->m_len = len; 6211 n->m_next = NULL; 6212 off = 0; 6213 6214 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6215 newmsg = mtod(n, struct sadb_msg *); 6216 newmsg->sadb_msg_errno = 0; 6217 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6218 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6219 6220 /* for authentication algorithm */ 6221 if (alen) { 6222 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6223 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6224 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6225 off += PFKEY_ALIGN8(sizeof(*sup)); 6226 6227 for (i = 1; i <= SADB_AALG_MAX; i++) { 6228 struct auth_hash *aalgo; 6229 u_int16_t minkeysize, maxkeysize; 6230 6231 aalgo = ah_algorithm_lookup(i); 6232 if (!aalgo) 6233 continue; 6234 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6235 alg->sadb_alg_id = i; 6236 alg->sadb_alg_ivlen = 0; 6237 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6238 alg->sadb_alg_minbits = _BITS(minkeysize); 6239 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6240 off += PFKEY_ALIGN8(sizeof(*alg)); 6241 } 6242 } 6243 6244 /* for encryption algorithm */ 6245 if (elen) { 6246 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6247 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6248 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6249 off += PFKEY_ALIGN8(sizeof(*sup)); 6250 6251 for (i = 1; i <= SADB_EALG_MAX; i++) { 6252 struct enc_xform *ealgo; 6253 6254 ealgo = esp_algorithm_lookup(i); 6255 if (!ealgo) 6256 continue; 6257 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6258 alg->sadb_alg_id = i; 6259 alg->sadb_alg_ivlen = ealgo->blocksize; 6260 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6261 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6262 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6263 } 6264 } 6265 6266 IPSEC_ASSERT(off == len, 6267 ("length assumption failed (off %u len %u)", off, len)); 6268 6269 m_freem(m); 6270 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6271 } 6272} 6273 6274/* 6275 * free secreg entry registered. 6276 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6277 */ 6278void 6279key_freereg(struct socket *so) 6280{ 6281 INIT_VNET_IPSEC(curvnet); 6282 struct secreg *reg; 6283 int i; 6284 6285 IPSEC_ASSERT(so != NULL, ("NULL so")); 6286 6287 /* 6288 * check whether existing or not. 6289 * check all type of SA, because there is a potential that 6290 * one socket is registered to multiple type of SA. 6291 */ 6292 REGTREE_LOCK(); 6293 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6294 LIST_FOREACH(reg, &V_regtree[i], chain) { 6295 if (reg->so == so && __LIST_CHAINED(reg)) { 6296 LIST_REMOVE(reg, chain); 6297 free(reg, M_IPSEC_SAR); 6298 break; 6299 } 6300 } 6301 } 6302 REGTREE_UNLOCK(); 6303} 6304 6305/* 6306 * SADB_EXPIRE processing 6307 * send 6308 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6309 * to KMD by PF_KEY. 6310 * NOTE: We send only soft lifetime extension. 6311 * 6312 * OUT: 0 : succeed 6313 * others : error number 6314 */ 6315static int 6316key_expire(struct secasvar *sav) 6317{ 6318 int s; 6319 int satype; 6320 struct mbuf *result = NULL, *m; 6321 int len; 6322 int error = -1; 6323 struct sadb_lifetime *lt; 6324 6325 /* XXX: Why do we lock ? */ 6326 s = splnet(); /*called from softclock()*/ 6327 6328 IPSEC_ASSERT (sav != NULL, ("null sav")); 6329 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6330 6331 /* set msg header */ 6332 satype = key_proto2satype(sav->sah->saidx.proto); 6333 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6334 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6335 if (!m) { 6336 error = ENOBUFS; 6337 goto fail; 6338 } 6339 result = m; 6340 6341 /* create SA extension */ 6342 m = key_setsadbsa(sav); 6343 if (!m) { 6344 error = ENOBUFS; 6345 goto fail; 6346 } 6347 m_cat(result, m); 6348 6349 /* create SA extension */ 6350 m = key_setsadbxsa2(sav->sah->saidx.mode, 6351 sav->replay ? sav->replay->count : 0, 6352 sav->sah->saidx.reqid); 6353 if (!m) { 6354 error = ENOBUFS; 6355 goto fail; 6356 } 6357 m_cat(result, m); 6358 6359 /* create lifetime extension (current and soft) */ 6360 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6361 m = key_alloc_mbuf(len); 6362 if (!m || m->m_next) { /*XXX*/ 6363 if (m) 6364 m_freem(m); 6365 error = ENOBUFS; 6366 goto fail; 6367 } 6368 bzero(mtod(m, caddr_t), len); 6369 lt = mtod(m, struct sadb_lifetime *); 6370 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6371 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6372 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6373 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6374 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6375 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6376 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6377 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6378 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; 6379 lt->sadb_lifetime_allocations = sav->lft_s->allocations; 6380 lt->sadb_lifetime_bytes = sav->lft_s->bytes; 6381 lt->sadb_lifetime_addtime = sav->lft_s->addtime; 6382 lt->sadb_lifetime_usetime = sav->lft_s->usetime; 6383 m_cat(result, m); 6384 6385 /* set sadb_address for source */ 6386 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6387 &sav->sah->saidx.src.sa, 6388 FULLMASK, IPSEC_ULPROTO_ANY); 6389 if (!m) { 6390 error = ENOBUFS; 6391 goto fail; 6392 } 6393 m_cat(result, m); 6394 6395 /* set sadb_address for destination */ 6396 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6397 &sav->sah->saidx.dst.sa, 6398 FULLMASK, IPSEC_ULPROTO_ANY); 6399 if (!m) { 6400 error = ENOBUFS; 6401 goto fail; 6402 } 6403 m_cat(result, m); 6404 6405 if ((result->m_flags & M_PKTHDR) == 0) { 6406 error = EINVAL; 6407 goto fail; 6408 } 6409 6410 if (result->m_len < sizeof(struct sadb_msg)) { 6411 result = m_pullup(result, sizeof(struct sadb_msg)); 6412 if (result == NULL) { 6413 error = ENOBUFS; 6414 goto fail; 6415 } 6416 } 6417 6418 result->m_pkthdr.len = 0; 6419 for (m = result; m; m = m->m_next) 6420 result->m_pkthdr.len += m->m_len; 6421 6422 mtod(result, struct sadb_msg *)->sadb_msg_len = 6423 PFKEY_UNIT64(result->m_pkthdr.len); 6424 6425 splx(s); 6426 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6427 6428 fail: 6429 if (result) 6430 m_freem(result); 6431 splx(s); 6432 return error; 6433} 6434 6435/* 6436 * SADB_FLUSH processing 6437 * receive 6438 * <base> 6439 * from the ikmpd, and free all entries in secastree. 6440 * and send, 6441 * <base> 6442 * to the ikmpd. 6443 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6444 * 6445 * m will always be freed. 6446 */ 6447static int 6448key_flush(so, m, mhp) 6449 struct socket *so; 6450 struct mbuf *m; 6451 const struct sadb_msghdr *mhp; 6452{ 6453 INIT_VNET_IPSEC(curvnet); 6454 struct sadb_msg *newmsg; 6455 struct secashead *sah, *nextsah; 6456 struct secasvar *sav, *nextsav; 6457 u_int16_t proto; 6458 u_int8_t state; 6459 u_int stateidx; 6460 6461 IPSEC_ASSERT(so != NULL, ("null socket")); 6462 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6463 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6464 6465 /* map satype to proto */ 6466 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6467 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6468 __func__)); 6469 return key_senderror(so, m, EINVAL); 6470 } 6471 6472 /* no SATYPE specified, i.e. flushing all SA. */ 6473 SAHTREE_LOCK(); 6474 for (sah = LIST_FIRST(&V_sahtree); 6475 sah != NULL; 6476 sah = nextsah) { 6477 nextsah = LIST_NEXT(sah, chain); 6478 6479 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6480 && proto != sah->saidx.proto) 6481 continue; 6482 6483 for (stateidx = 0; 6484 stateidx < _ARRAYLEN(saorder_state_alive); 6485 stateidx++) { 6486 state = saorder_state_any[stateidx]; 6487 for (sav = LIST_FIRST(&sah->savtree[state]); 6488 sav != NULL; 6489 sav = nextsav) { 6490 6491 nextsav = LIST_NEXT(sav, chain); 6492 6493 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6494 KEY_FREESAV(&sav); 6495 } 6496 } 6497 6498 sah->state = SADB_SASTATE_DEAD; 6499 } 6500 SAHTREE_UNLOCK(); 6501 6502 if (m->m_len < sizeof(struct sadb_msg) || 6503 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6504 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6505 return key_senderror(so, m, ENOBUFS); 6506 } 6507 6508 if (m->m_next) 6509 m_freem(m->m_next); 6510 m->m_next = NULL; 6511 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6512 newmsg = mtod(m, struct sadb_msg *); 6513 newmsg->sadb_msg_errno = 0; 6514 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6515 6516 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6517} 6518 6519/* 6520 * SADB_DUMP processing 6521 * dump all entries including status of DEAD in SAD. 6522 * receive 6523 * <base> 6524 * from the ikmpd, and dump all secasvar leaves 6525 * and send, 6526 * <base> ..... 6527 * to the ikmpd. 6528 * 6529 * m will always be freed. 6530 */ 6531static int 6532key_dump(so, m, mhp) 6533 struct socket *so; 6534 struct mbuf *m; 6535 const struct sadb_msghdr *mhp; 6536{ 6537 INIT_VNET_IPSEC(curvnet); 6538 struct secashead *sah; 6539 struct secasvar *sav; 6540 u_int16_t proto; 6541 u_int stateidx; 6542 u_int8_t satype; 6543 u_int8_t state; 6544 int cnt; 6545 struct sadb_msg *newmsg; 6546 struct mbuf *n; 6547 6548 IPSEC_ASSERT(so != NULL, ("null socket")); 6549 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6550 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6551 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6552 6553 /* map satype to proto */ 6554 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6555 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6556 __func__)); 6557 return key_senderror(so, m, EINVAL); 6558 } 6559 6560 /* count sav entries to be sent to the userland. */ 6561 cnt = 0; 6562 SAHTREE_LOCK(); 6563 LIST_FOREACH(sah, &V_sahtree, chain) { 6564 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6565 && proto != sah->saidx.proto) 6566 continue; 6567 6568 for (stateidx = 0; 6569 stateidx < _ARRAYLEN(saorder_state_any); 6570 stateidx++) { 6571 state = saorder_state_any[stateidx]; 6572 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6573 cnt++; 6574 } 6575 } 6576 } 6577 6578 if (cnt == 0) { 6579 SAHTREE_UNLOCK(); 6580 return key_senderror(so, m, ENOENT); 6581 } 6582 6583 /* send this to the userland, one at a time. */ 6584 newmsg = NULL; 6585 LIST_FOREACH(sah, &V_sahtree, chain) { 6586 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6587 && proto != sah->saidx.proto) 6588 continue; 6589 6590 /* map proto to satype */ 6591 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6592 SAHTREE_UNLOCK(); 6593 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6594 "SAD.\n", __func__)); 6595 return key_senderror(so, m, EINVAL); 6596 } 6597 6598 for (stateidx = 0; 6599 stateidx < _ARRAYLEN(saorder_state_any); 6600 stateidx++) { 6601 state = saorder_state_any[stateidx]; 6602 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6603 n = key_setdumpsa(sav, SADB_DUMP, satype, 6604 --cnt, mhp->msg->sadb_msg_pid); 6605 if (!n) { 6606 SAHTREE_UNLOCK(); 6607 return key_senderror(so, m, ENOBUFS); 6608 } 6609 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6610 } 6611 } 6612 } 6613 SAHTREE_UNLOCK(); 6614 6615 m_freem(m); 6616 return 0; 6617} 6618 6619/* 6620 * SADB_X_PROMISC processing 6621 * 6622 * m will always be freed. 6623 */ 6624static int 6625key_promisc(so, m, mhp) 6626 struct socket *so; 6627 struct mbuf *m; 6628 const struct sadb_msghdr *mhp; 6629{ 6630 int olen; 6631 6632 IPSEC_ASSERT(so != NULL, ("null socket")); 6633 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6634 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6635 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6636 6637 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6638 6639 if (olen < sizeof(struct sadb_msg)) { 6640#if 1 6641 return key_senderror(so, m, EINVAL); 6642#else 6643 m_freem(m); 6644 return 0; 6645#endif 6646 } else if (olen == sizeof(struct sadb_msg)) { 6647 /* enable/disable promisc mode */ 6648 struct keycb *kp; 6649 6650 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6651 return key_senderror(so, m, EINVAL); 6652 mhp->msg->sadb_msg_errno = 0; 6653 switch (mhp->msg->sadb_msg_satype) { 6654 case 0: 6655 case 1: 6656 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6657 break; 6658 default: 6659 return key_senderror(so, m, EINVAL); 6660 } 6661 6662 /* send the original message back to everyone */ 6663 mhp->msg->sadb_msg_errno = 0; 6664 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6665 } else { 6666 /* send packet as is */ 6667 6668 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6669 6670 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6671 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6672 } 6673} 6674 6675static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6676 const struct sadb_msghdr *)) = { 6677 NULL, /* SADB_RESERVED */ 6678 key_getspi, /* SADB_GETSPI */ 6679 key_update, /* SADB_UPDATE */ 6680 key_add, /* SADB_ADD */ 6681 key_delete, /* SADB_DELETE */ 6682 key_get, /* SADB_GET */ 6683 key_acquire2, /* SADB_ACQUIRE */ 6684 key_register, /* SADB_REGISTER */ 6685 NULL, /* SADB_EXPIRE */ 6686 key_flush, /* SADB_FLUSH */ 6687 key_dump, /* SADB_DUMP */ 6688 key_promisc, /* SADB_X_PROMISC */ 6689 NULL, /* SADB_X_PCHANGE */ 6690 key_spdadd, /* SADB_X_SPDUPDATE */ 6691 key_spdadd, /* SADB_X_SPDADD */ 6692 key_spddelete, /* SADB_X_SPDDELETE */ 6693 key_spdget, /* SADB_X_SPDGET */ 6694 NULL, /* SADB_X_SPDACQUIRE */ 6695 key_spddump, /* SADB_X_SPDDUMP */ 6696 key_spdflush, /* SADB_X_SPDFLUSH */ 6697 key_spdadd, /* SADB_X_SPDSETIDX */ 6698 NULL, /* SADB_X_SPDEXPIRE */ 6699 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6700}; 6701 6702/* 6703 * parse sadb_msg buffer to process PFKEYv2, 6704 * and create a data to response if needed. 6705 * I think to be dealed with mbuf directly. 6706 * IN: 6707 * msgp : pointer to pointer to a received buffer pulluped. 6708 * This is rewrited to response. 6709 * so : pointer to socket. 6710 * OUT: 6711 * length for buffer to send to user process. 6712 */ 6713int 6714key_parse(m, so) 6715 struct mbuf *m; 6716 struct socket *so; 6717{ 6718 INIT_VNET_IPSEC(curvnet); 6719 struct sadb_msg *msg; 6720 struct sadb_msghdr mh; 6721 u_int orglen; 6722 int error; 6723 int target; 6724 6725 IPSEC_ASSERT(so != NULL, ("null socket")); 6726 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6727 6728#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6729 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6730 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6731 kdebug_sadb(msg)); 6732#endif 6733 6734 if (m->m_len < sizeof(struct sadb_msg)) { 6735 m = m_pullup(m, sizeof(struct sadb_msg)); 6736 if (!m) 6737 return ENOBUFS; 6738 } 6739 msg = mtod(m, struct sadb_msg *); 6740 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6741 target = KEY_SENDUP_ONE; 6742 6743 if ((m->m_flags & M_PKTHDR) == 0 || 6744 m->m_pkthdr.len != m->m_pkthdr.len) { 6745 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6746 V_pfkeystat.out_invlen++; 6747 error = EINVAL; 6748 goto senderror; 6749 } 6750 6751 if (msg->sadb_msg_version != PF_KEY_V2) { 6752 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6753 __func__, msg->sadb_msg_version)); 6754 V_pfkeystat.out_invver++; 6755 error = EINVAL; 6756 goto senderror; 6757 } 6758 6759 if (msg->sadb_msg_type > SADB_MAX) { 6760 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6761 __func__, msg->sadb_msg_type)); 6762 V_pfkeystat.out_invmsgtype++; 6763 error = EINVAL; 6764 goto senderror; 6765 } 6766 6767 /* for old-fashioned code - should be nuked */ 6768 if (m->m_pkthdr.len > MCLBYTES) { 6769 m_freem(m); 6770 return ENOBUFS; 6771 } 6772 if (m->m_next) { 6773 struct mbuf *n; 6774 6775 MGETHDR(n, M_DONTWAIT, MT_DATA); 6776 if (n && m->m_pkthdr.len > MHLEN) { 6777 MCLGET(n, M_DONTWAIT); 6778 if ((n->m_flags & M_EXT) == 0) { 6779 m_free(n); 6780 n = NULL; 6781 } 6782 } 6783 if (!n) { 6784 m_freem(m); 6785 return ENOBUFS; 6786 } 6787 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6788 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6789 n->m_next = NULL; 6790 m_freem(m); 6791 m = n; 6792 } 6793 6794 /* align the mbuf chain so that extensions are in contiguous region. */ 6795 error = key_align(m, &mh); 6796 if (error) 6797 return error; 6798 6799 msg = mh.msg; 6800 6801 /* check SA type */ 6802 switch (msg->sadb_msg_satype) { 6803 case SADB_SATYPE_UNSPEC: 6804 switch (msg->sadb_msg_type) { 6805 case SADB_GETSPI: 6806 case SADB_UPDATE: 6807 case SADB_ADD: 6808 case SADB_DELETE: 6809 case SADB_GET: 6810 case SADB_ACQUIRE: 6811 case SADB_EXPIRE: 6812 ipseclog((LOG_DEBUG, "%s: must specify satype " 6813 "when msg type=%u.\n", __func__, 6814 msg->sadb_msg_type)); 6815 V_pfkeystat.out_invsatype++; 6816 error = EINVAL; 6817 goto senderror; 6818 } 6819 break; 6820 case SADB_SATYPE_AH: 6821 case SADB_SATYPE_ESP: 6822 case SADB_X_SATYPE_IPCOMP: 6823 case SADB_X_SATYPE_TCPSIGNATURE: 6824 switch (msg->sadb_msg_type) { 6825 case SADB_X_SPDADD: 6826 case SADB_X_SPDDELETE: 6827 case SADB_X_SPDGET: 6828 case SADB_X_SPDDUMP: 6829 case SADB_X_SPDFLUSH: 6830 case SADB_X_SPDSETIDX: 6831 case SADB_X_SPDUPDATE: 6832 case SADB_X_SPDDELETE2: 6833 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6834 __func__, msg->sadb_msg_type)); 6835 V_pfkeystat.out_invsatype++; 6836 error = EINVAL; 6837 goto senderror; 6838 } 6839 break; 6840 case SADB_SATYPE_RSVP: 6841 case SADB_SATYPE_OSPFV2: 6842 case SADB_SATYPE_RIPV2: 6843 case SADB_SATYPE_MIP: 6844 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6845 __func__, msg->sadb_msg_satype)); 6846 V_pfkeystat.out_invsatype++; 6847 error = EOPNOTSUPP; 6848 goto senderror; 6849 case 1: /* XXX: What does it do? */ 6850 if (msg->sadb_msg_type == SADB_X_PROMISC) 6851 break; 6852 /*FALLTHROUGH*/ 6853 default: 6854 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6855 __func__, msg->sadb_msg_satype)); 6856 V_pfkeystat.out_invsatype++; 6857 error = EINVAL; 6858 goto senderror; 6859 } 6860 6861 /* check field of upper layer protocol and address family */ 6862 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6863 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6864 struct sadb_address *src0, *dst0; 6865 u_int plen; 6866 6867 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6868 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6869 6870 /* check upper layer protocol */ 6871 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6872 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6873 "mismatched.\n", __func__)); 6874 V_pfkeystat.out_invaddr++; 6875 error = EINVAL; 6876 goto senderror; 6877 } 6878 6879 /* check family */ 6880 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6881 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6882 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6883 __func__)); 6884 V_pfkeystat.out_invaddr++; 6885 error = EINVAL; 6886 goto senderror; 6887 } 6888 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6889 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6890 ipseclog((LOG_DEBUG, "%s: address struct size " 6891 "mismatched.\n", __func__)); 6892 V_pfkeystat.out_invaddr++; 6893 error = EINVAL; 6894 goto senderror; 6895 } 6896 6897 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6898 case AF_INET: 6899 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6900 sizeof(struct sockaddr_in)) { 6901 V_pfkeystat.out_invaddr++; 6902 error = EINVAL; 6903 goto senderror; 6904 } 6905 break; 6906 case AF_INET6: 6907 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6908 sizeof(struct sockaddr_in6)) { 6909 V_pfkeystat.out_invaddr++; 6910 error = EINVAL; 6911 goto senderror; 6912 } 6913 break; 6914 default: 6915 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6916 __func__)); 6917 V_pfkeystat.out_invaddr++; 6918 error = EAFNOSUPPORT; 6919 goto senderror; 6920 } 6921 6922 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6923 case AF_INET: 6924 plen = sizeof(struct in_addr) << 3; 6925 break; 6926 case AF_INET6: 6927 plen = sizeof(struct in6_addr) << 3; 6928 break; 6929 default: 6930 plen = 0; /*fool gcc*/ 6931 break; 6932 } 6933 6934 /* check max prefix length */ 6935 if (src0->sadb_address_prefixlen > plen || 6936 dst0->sadb_address_prefixlen > plen) { 6937 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6938 __func__)); 6939 V_pfkeystat.out_invaddr++; 6940 error = EINVAL; 6941 goto senderror; 6942 } 6943 6944 /* 6945 * prefixlen == 0 is valid because there can be a case when 6946 * all addresses are matched. 6947 */ 6948 } 6949 6950 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6951 key_typesw[msg->sadb_msg_type] == NULL) { 6952 V_pfkeystat.out_invmsgtype++; 6953 error = EINVAL; 6954 goto senderror; 6955 } 6956 6957 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6958 6959senderror: 6960 msg->sadb_msg_errno = error; 6961 return key_sendup_mbuf(so, m, target); 6962} 6963 6964static int 6965key_senderror(so, m, code) 6966 struct socket *so; 6967 struct mbuf *m; 6968 int code; 6969{ 6970 struct sadb_msg *msg; 6971 6972 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6973 ("mbuf too small, len %u", m->m_len)); 6974 6975 msg = mtod(m, struct sadb_msg *); 6976 msg->sadb_msg_errno = code; 6977 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6978} 6979 6980/* 6981 * set the pointer to each header into message buffer. 6982 * m will be freed on error. 6983 * XXX larger-than-MCLBYTES extension? 6984 */ 6985static int 6986key_align(m, mhp) 6987 struct mbuf *m; 6988 struct sadb_msghdr *mhp; 6989{ 6990 INIT_VNET_IPSEC(curvnet); 6991 struct mbuf *n; 6992 struct sadb_ext *ext; 6993 size_t off, end; 6994 int extlen; 6995 int toff; 6996 6997 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6998 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6999 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 7000 ("mbuf too small, len %u", m->m_len)); 7001 7002 /* initialize */ 7003 bzero(mhp, sizeof(*mhp)); 7004 7005 mhp->msg = mtod(m, struct sadb_msg *); 7006 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7007 7008 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7009 extlen = end; /*just in case extlen is not updated*/ 7010 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7011 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7012 if (!n) { 7013 /* m is already freed */ 7014 return ENOBUFS; 7015 } 7016 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7017 7018 /* set pointer */ 7019 switch (ext->sadb_ext_type) { 7020 case SADB_EXT_SA: 7021 case SADB_EXT_ADDRESS_SRC: 7022 case SADB_EXT_ADDRESS_DST: 7023 case SADB_EXT_ADDRESS_PROXY: 7024 case SADB_EXT_LIFETIME_CURRENT: 7025 case SADB_EXT_LIFETIME_HARD: 7026 case SADB_EXT_LIFETIME_SOFT: 7027 case SADB_EXT_KEY_AUTH: 7028 case SADB_EXT_KEY_ENCRYPT: 7029 case SADB_EXT_IDENTITY_SRC: 7030 case SADB_EXT_IDENTITY_DST: 7031 case SADB_EXT_SENSITIVITY: 7032 case SADB_EXT_PROPOSAL: 7033 case SADB_EXT_SUPPORTED_AUTH: 7034 case SADB_EXT_SUPPORTED_ENCRYPT: 7035 case SADB_EXT_SPIRANGE: 7036 case SADB_X_EXT_POLICY: 7037 case SADB_X_EXT_SA2: 7038 /* duplicate check */ 7039 /* 7040 * XXX Are there duplication payloads of either 7041 * KEY_AUTH or KEY_ENCRYPT ? 7042 */ 7043 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7044 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 7045 "%u\n", __func__, ext->sadb_ext_type)); 7046 m_freem(m); 7047 V_pfkeystat.out_dupext++; 7048 return EINVAL; 7049 } 7050 break; 7051 default: 7052 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7053 __func__, ext->sadb_ext_type)); 7054 m_freem(m); 7055 V_pfkeystat.out_invexttype++; 7056 return EINVAL; 7057 } 7058 7059 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7060 7061 if (key_validate_ext(ext, extlen)) { 7062 m_freem(m); 7063 V_pfkeystat.out_invlen++; 7064 return EINVAL; 7065 } 7066 7067 n = m_pulldown(m, off, extlen, &toff); 7068 if (!n) { 7069 /* m is already freed */ 7070 return ENOBUFS; 7071 } 7072 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7073 7074 mhp->ext[ext->sadb_ext_type] = ext; 7075 mhp->extoff[ext->sadb_ext_type] = off; 7076 mhp->extlen[ext->sadb_ext_type] = extlen; 7077 } 7078 7079 if (off != end) { 7080 m_freem(m); 7081 V_pfkeystat.out_invlen++; 7082 return EINVAL; 7083 } 7084 7085 return 0; 7086} 7087 7088static int 7089key_validate_ext(ext, len) 7090 const struct sadb_ext *ext; 7091 int len; 7092{ 7093 const struct sockaddr *sa; 7094 enum { NONE, ADDR } checktype = NONE; 7095 int baselen = 0; 7096 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7097 7098 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7099 return EINVAL; 7100 7101 /* if it does not match minimum/maximum length, bail */ 7102 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7103 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7104 return EINVAL; 7105 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7106 return EINVAL; 7107 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7108 return EINVAL; 7109 7110 /* more checks based on sadb_ext_type XXX need more */ 7111 switch (ext->sadb_ext_type) { 7112 case SADB_EXT_ADDRESS_SRC: 7113 case SADB_EXT_ADDRESS_DST: 7114 case SADB_EXT_ADDRESS_PROXY: 7115 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7116 checktype = ADDR; 7117 break; 7118 case SADB_EXT_IDENTITY_SRC: 7119 case SADB_EXT_IDENTITY_DST: 7120 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7121 SADB_X_IDENTTYPE_ADDR) { 7122 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7123 checktype = ADDR; 7124 } else 7125 checktype = NONE; 7126 break; 7127 default: 7128 checktype = NONE; 7129 break; 7130 } 7131 7132 switch (checktype) { 7133 case NONE: 7134 break; 7135 case ADDR: 7136 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7137 if (len < baselen + sal) 7138 return EINVAL; 7139 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7140 return EINVAL; 7141 break; 7142 } 7143 7144 return 0; 7145} 7146 7147void 7148key_init(void) 7149{ 7150 INIT_VNET_IPSEC(curvnet); 7151 int i; 7152 7153 V_key_debug_level = 0; 7154 V_key_spi_trycnt = 1000; 7155 V_key_spi_minval = 0x100; 7156 V_key_spi_maxval = 0x0fffffff; /* XXX */ 7157 V_policy_id = 0; 7158 V_key_int_random = 60; /*interval to initialize randseed,1(m)*/ 7159 V_key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 7160 V_key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 7161 V_key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 7162 V_key_preferred_oldsa = 1; /* preferred old sa rather than new sa*/ 7163 7164 V_acq_seq = 0; 7165 7166 V_ipsec_esp_keymin = 256; 7167 V_ipsec_esp_auth = 0; 7168 V_ipsec_ah_keymin = 128; 7169 7170 SPTREE_LOCK_INIT(); 7171 REGTREE_LOCK_INIT(); 7172 SAHTREE_LOCK_INIT(); 7173 ACQ_LOCK_INIT(); 7174 SPACQ_LOCK_INIT(); 7175 7176 for (i = 0; i < IPSEC_DIR_MAX; i++) 7177 LIST_INIT(&V_sptree[i]); 7178 7179 LIST_INIT(&V_sahtree); 7180 7181 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7182 LIST_INIT(&V_regtree[i]); 7183 7184 LIST_INIT(&V_acqtree); 7185 LIST_INIT(&V_spacqtree); 7186 7187 /* system default */ 7188 V_ip4_def_policy.policy = IPSEC_POLICY_NONE; 7189 V_ip4_def_policy.refcnt++; /*never reclaim this*/ 7190 7191#ifndef IPSEC_DEBUG2 7192 timeout((void *)key_timehandler, (void *)0, hz); 7193#endif /*IPSEC_DEBUG2*/ 7194 7195 /* initialize key statistics */ 7196 keystat.getspi_count = 1; 7197 7198 printf("IPsec: Initialized Security Association Processing.\n"); 7199 7200 return; 7201} 7202 7203/* 7204 * XXX: maybe This function is called after INBOUND IPsec processing. 7205 * 7206 * Special check for tunnel-mode packets. 7207 * We must make some checks for consistency between inner and outer IP header. 7208 * 7209 * xxx more checks to be provided 7210 */ 7211int 7212key_checktunnelsanity(sav, family, src, dst) 7213 struct secasvar *sav; 7214 u_int family; 7215 caddr_t src; 7216 caddr_t dst; 7217{ 7218 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7219 7220 /* XXX: check inner IP header */ 7221 7222 return 1; 7223} 7224 7225/* record data transfer on SA, and update timestamps */ 7226void 7227key_sa_recordxfer(sav, m) 7228 struct secasvar *sav; 7229 struct mbuf *m; 7230{ 7231 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7232 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7233 if (!sav->lft_c) 7234 return; 7235 7236 /* 7237 * XXX Currently, there is a difference of bytes size 7238 * between inbound and outbound processing. 7239 */ 7240 sav->lft_c->bytes += m->m_pkthdr.len; 7241 /* to check bytes lifetime is done in key_timehandler(). */ 7242 7243 /* 7244 * We use the number of packets as the unit of 7245 * allocations. We increment the variable 7246 * whenever {esp,ah}_{in,out}put is called. 7247 */ 7248 sav->lft_c->allocations++; 7249 /* XXX check for expires? */ 7250 7251 /* 7252 * NOTE: We record CURRENT usetime by using wall clock, 7253 * in seconds. HARD and SOFT lifetime are measured by the time 7254 * difference (again in seconds) from usetime. 7255 * 7256 * usetime 7257 * v expire expire 7258 * -----+-----+--------+---> t 7259 * <--------------> HARD 7260 * <-----> SOFT 7261 */ 7262 sav->lft_c->usetime = time_second; 7263 /* XXX check for expires? */ 7264 7265 return; 7266} 7267 7268/* dumb version */ 7269void 7270key_sa_routechange(dst) 7271 struct sockaddr *dst; 7272{ 7273 INIT_VNET_IPSEC(curvnet); 7274 struct secashead *sah; 7275 struct route *ro; 7276 7277 SAHTREE_LOCK(); 7278 LIST_FOREACH(sah, &V_sahtree, chain) { 7279 ro = &sah->sa_route; 7280 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7281 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7282 RTFREE(ro->ro_rt); 7283 ro->ro_rt = (struct rtentry *)NULL; 7284 } 7285 } 7286 SAHTREE_UNLOCK(); 7287} 7288 7289static void 7290key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7291{ 7292 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7293 SAHTREE_LOCK_ASSERT(); 7294 7295 if (sav->state != state) { 7296 if (__LIST_CHAINED(sav)) 7297 LIST_REMOVE(sav, chain); 7298 sav->state = state; 7299 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7300 } 7301} 7302 7303void 7304key_sa_stir_iv(sav) 7305 struct secasvar *sav; 7306{ 7307 7308 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7309 key_randomfill(sav->iv, sav->ivlen); 7310} 7311 7312/* XXX too much? */ 7313static struct mbuf * 7314key_alloc_mbuf(l) 7315 int l; 7316{ 7317 struct mbuf *m = NULL, *n; 7318 int len, t; 7319 7320 len = l; 7321 while (len > 0) { 7322 MGET(n, M_DONTWAIT, MT_DATA); 7323 if (n && len > MLEN) 7324 MCLGET(n, M_DONTWAIT); 7325 if (!n) { 7326 m_freem(m); 7327 return NULL; 7328 } 7329 7330 n->m_next = NULL; 7331 n->m_len = 0; 7332 n->m_len = M_TRAILINGSPACE(n); 7333 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7334 if (n->m_len > len) { 7335 t = (n->m_len - len) & ~(sizeof(long) - 1); 7336 n->m_data += t; 7337 n->m_len = len; 7338 } 7339 7340 len -= n->m_len; 7341 7342 if (m) 7343 m_cat(m, n); 7344 else 7345 m = n; 7346 } 7347 7348 return m; 7349} 7350 7351/* 7352 * Take one of the kernel's security keys and convert it into a PF_KEY 7353 * structure within an mbuf, suitable for sending up to a waiting 7354 * application in user land. 7355 * 7356 * IN: 7357 * src: A pointer to a kernel security key. 7358 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7359 * OUT: 7360 * a valid mbuf or NULL indicating an error 7361 * 7362 */ 7363 7364static struct mbuf * 7365key_setkey(struct seckey *src, u_int16_t exttype) 7366{ 7367 struct mbuf *m; 7368 struct sadb_key *p; 7369 int len; 7370 7371 if (src == NULL) 7372 return NULL; 7373 7374 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7375 m = key_alloc_mbuf(len); 7376 if (m == NULL) 7377 return NULL; 7378 p = mtod(m, struct sadb_key *); 7379 bzero(p, len); 7380 p->sadb_key_len = PFKEY_UNIT64(len); 7381 p->sadb_key_exttype = exttype; 7382 p->sadb_key_bits = src->bits; 7383 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7384 7385 return m; 7386} 7387 7388/* 7389 * Take one of the kernel's lifetime data structures and convert it 7390 * into a PF_KEY structure within an mbuf, suitable for sending up to 7391 * a waiting application in user land. 7392 * 7393 * IN: 7394 * src: A pointer to a kernel lifetime structure. 7395 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7396 * data structures for more information. 7397 * OUT: 7398 * a valid mbuf or NULL indicating an error 7399 * 7400 */ 7401 7402static struct mbuf * 7403key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7404{ 7405 struct mbuf *m = NULL; 7406 struct sadb_lifetime *p; 7407 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7408 7409 if (src == NULL) 7410 return NULL; 7411 7412 m = key_alloc_mbuf(len); 7413 if (m == NULL) 7414 return m; 7415 p = mtod(m, struct sadb_lifetime *); 7416 7417 bzero(p, len); 7418 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7419 p->sadb_lifetime_exttype = exttype; 7420 p->sadb_lifetime_allocations = src->allocations; 7421 p->sadb_lifetime_bytes = src->bytes; 7422 p->sadb_lifetime_addtime = src->addtime; 7423 p->sadb_lifetime_usetime = src->usetime; 7424 7425 return m; 7426 7427} 7428