key.c revision 170799
1/* $FreeBSD: head/sys/netipsec/key.c 170799 2007-06-15 22:35:59Z bz $ */ 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 60#include <net/if.h> 61#include <net/route.h> 62#include <net/raw_cb.h> 63 64#include <netinet/in.h> 65#include <netinet/in_systm.h> 66#include <netinet/ip.h> 67#include <netinet/in_var.h> 68 69#ifdef INET6 70#include <netinet/ip6.h> 71#include <netinet6/in6_var.h> 72#include <netinet6/ip6_var.h> 73#endif /* INET6 */ 74 75#ifdef INET 76#include <netinet/in_pcb.h> 77#endif 78#ifdef INET6 79#include <netinet6/in6_pcb.h> 80#endif /* INET6 */ 81 82#include <net/pfkeyv2.h> 83#include <netipsec/keydb.h> 84#include <netipsec/key.h> 85#include <netipsec/keysock.h> 86#include <netipsec/key_debug.h> 87 88#include <netipsec/ipsec.h> 89#ifdef INET6 90#include <netipsec/ipsec6.h> 91#endif 92 93#include <netipsec/xform.h> 94 95#include <machine/stdarg.h> 96 97/* randomness */ 98#include <sys/random.h> 99 100#define FULLMASK 0xff 101#define _BITS(bytes) ((bytes) << 3) 102 103/* 104 * Note on SA reference counting: 105 * - SAs that are not in DEAD state will have (total external reference + 1) 106 * following value in reference count field. they cannot be freed and are 107 * referenced from SA header. 108 * - SAs that are in DEAD state will have (total external reference) 109 * in reference count field. they are ready to be freed. reference from 110 * SA header will be removed in key_delsav(), when the reference count 111 * field hits 0 (= no external reference other than from SA header. 112 */ 113 114u_int32_t key_debug_level = 0; 115static u_int key_spi_trycnt = 1000; 116static u_int32_t key_spi_minval = 0x100; 117static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */ 118static u_int32_t policy_id = 0; 119static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/ 120static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 121static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 122static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 123static int key_preferred_oldsa = 1; /* preferred old sa rather than new sa.*/ 124 125static u_int32_t acq_seq = 0; 126 127static LIST_HEAD(_sptree, secpolicy) sptree[IPSEC_DIR_MAX]; /* SPD */ 128static struct mtx sptree_lock; 129#define SPTREE_LOCK_INIT() \ 130 mtx_init(&sptree_lock, "sptree", \ 131 "fast ipsec security policy database", MTX_DEF) 132#define SPTREE_LOCK_DESTROY() mtx_destroy(&sptree_lock) 133#define SPTREE_LOCK() mtx_lock(&sptree_lock) 134#define SPTREE_UNLOCK() mtx_unlock(&sptree_lock) 135#define SPTREE_LOCK_ASSERT() mtx_assert(&sptree_lock, MA_OWNED) 136 137static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 138static struct mtx sahtree_lock; 139#define SAHTREE_LOCK_INIT() \ 140 mtx_init(&sahtree_lock, "sahtree", \ 141 "fast ipsec security association database", MTX_DEF) 142#define SAHTREE_LOCK_DESTROY() mtx_destroy(&sahtree_lock) 143#define SAHTREE_LOCK() mtx_lock(&sahtree_lock) 144#define SAHTREE_UNLOCK() mtx_unlock(&sahtree_lock) 145#define SAHTREE_LOCK_ASSERT() mtx_assert(&sahtree_lock, MA_OWNED) 146 147 /* registed list */ 148static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 149static struct mtx regtree_lock; 150#define REGTREE_LOCK_INIT() \ 151 mtx_init(®tree_lock, "regtree", "fast ipsec regtree", MTX_DEF) 152#define REGTREE_LOCK_DESTROY() mtx_destroy(®tree_lock) 153#define REGTREE_LOCK() mtx_lock(®tree_lock) 154#define REGTREE_UNLOCK() mtx_unlock(®tree_lock) 155#define REGTREE_LOCK_ASSERT() mtx_assert(®tree_lock, MA_OWNED) 156 157static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 158static struct mtx acq_lock; 159#define ACQ_LOCK_INIT() \ 160 mtx_init(&acq_lock, "acqtree", "fast ipsec acquire list", MTX_DEF) 161#define ACQ_LOCK_DESTROY() mtx_destroy(&acq_lock) 162#define ACQ_LOCK() mtx_lock(&acq_lock) 163#define ACQ_UNLOCK() mtx_unlock(&acq_lock) 164#define ACQ_LOCK_ASSERT() mtx_assert(&acq_lock, MA_OWNED) 165 166static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 167static struct mtx spacq_lock; 168#define SPACQ_LOCK_INIT() \ 169 mtx_init(&spacq_lock, "spacqtree", \ 170 "fast ipsec security policy acquire list", MTX_DEF) 171#define SPACQ_LOCK_DESTROY() mtx_destroy(&spacq_lock) 172#define SPACQ_LOCK() mtx_lock(&spacq_lock) 173#define SPACQ_UNLOCK() mtx_unlock(&spacq_lock) 174#define SPACQ_LOCK_ASSERT() mtx_assert(&spacq_lock, MA_OWNED) 175 176/* search order for SAs */ 177static const u_int saorder_state_valid_prefer_old[] = { 178 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 179}; 180static const u_int saorder_state_valid_prefer_new[] = { 181 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 182}; 183static u_int saorder_state_alive[] = { 184 /* except DEAD */ 185 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 186}; 187static u_int saorder_state_any[] = { 188 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 189 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 190}; 191 192static const int minsize[] = { 193 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 194 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 195 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 196 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 197 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 198 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 199 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 200 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 201 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 202 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 203 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 204 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 205 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 206 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 207 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 208 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 209 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 210 0, /* SADB_X_EXT_KMPRIVATE */ 211 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 212 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 213}; 214static const int maxsize[] = { 215 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 216 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 217 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 218 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 219 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 220 0, /* SADB_EXT_ADDRESS_SRC */ 221 0, /* SADB_EXT_ADDRESS_DST */ 222 0, /* SADB_EXT_ADDRESS_PROXY */ 223 0, /* SADB_EXT_KEY_AUTH */ 224 0, /* SADB_EXT_KEY_ENCRYPT */ 225 0, /* SADB_EXT_IDENTITY_SRC */ 226 0, /* SADB_EXT_IDENTITY_DST */ 227 0, /* SADB_EXT_SENSITIVITY */ 228 0, /* SADB_EXT_PROPOSAL */ 229 0, /* SADB_EXT_SUPPORTED_AUTH */ 230 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 231 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 232 0, /* SADB_X_EXT_KMPRIVATE */ 233 0, /* SADB_X_EXT_POLICY */ 234 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 235}; 236 237static int ipsec_esp_keymin = 256; 238static int ipsec_esp_auth = 0; 239static int ipsec_ah_keymin = 128; 240 241#ifdef SYSCTL_DECL 242SYSCTL_DECL(_net_key); 243#endif 244 245SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \ 246 &key_debug_level, 0, ""); 247 248/* max count of trial for the decision of spi value */ 249SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \ 250 &key_spi_trycnt, 0, ""); 251 252/* minimum spi value to allocate automatically. */ 253SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \ 254 &key_spi_minval, 0, ""); 255 256/* maximun spi value to allocate automatically. */ 257SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \ 258 &key_spi_maxval, 0, ""); 259 260/* interval to initialize randseed */ 261SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \ 262 &key_int_random, 0, ""); 263 264/* lifetime for larval SA */ 265SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \ 266 &key_larval_lifetime, 0, ""); 267 268/* counter for blocking to send SADB_ACQUIRE to IKEd */ 269SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \ 270 &key_blockacq_count, 0, ""); 271 272/* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 273SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \ 274 &key_blockacq_lifetime, 0, ""); 275 276/* ESP auth */ 277SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \ 278 &ipsec_esp_auth, 0, ""); 279 280/* minimum ESP key length */ 281SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \ 282 &ipsec_esp_keymin, 0, ""); 283 284/* minimum AH key length */ 285SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \ 286 &ipsec_ah_keymin, 0, ""); 287 288/* perfered old SA rather than new SA */ 289SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, preferred_oldsa, CTLFLAG_RW,\ 290 &key_preferred_oldsa, 0, ""); 291 292#define __LIST_CHAINED(elm) \ 293 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 294#define LIST_INSERT_TAIL(head, elm, type, field) \ 295do {\ 296 struct type *curelm = LIST_FIRST(head); \ 297 if (curelm == NULL) {\ 298 LIST_INSERT_HEAD(head, elm, field); \ 299 } else { \ 300 while (LIST_NEXT(curelm, field)) \ 301 curelm = LIST_NEXT(curelm, field);\ 302 LIST_INSERT_AFTER(curelm, elm, field);\ 303 }\ 304} while (0) 305 306#define KEY_CHKSASTATE(head, sav, name) \ 307do { \ 308 if ((head) != (sav)) { \ 309 ipseclog((LOG_DEBUG, "%s: state mismatched (TREE=%d SA=%d)\n", \ 310 (name), (head), (sav))); \ 311 continue; \ 312 } \ 313} while (0) 314 315#define KEY_CHKSPDIR(head, sp, name) \ 316do { \ 317 if ((head) != (sp)) { \ 318 ipseclog((LOG_DEBUG, "%s: direction mismatched (TREE=%d SP=%d), " \ 319 "anyway continue.\n", \ 320 (name), (head), (sp))); \ 321 } \ 322} while (0) 323 324MALLOC_DEFINE(M_IPSEC_SA, "secasvar", "ipsec security association"); 325MALLOC_DEFINE(M_IPSEC_SAH, "sahead", "ipsec sa head"); 326MALLOC_DEFINE(M_IPSEC_SP, "ipsecpolicy", "ipsec security policy"); 327MALLOC_DEFINE(M_IPSEC_SR, "ipsecrequest", "ipsec security request"); 328MALLOC_DEFINE(M_IPSEC_MISC, "ipsec-misc", "ipsec miscellaneous"); 329MALLOC_DEFINE(M_IPSEC_SAQ, "ipsec-saq", "ipsec sa acquire"); 330MALLOC_DEFINE(M_IPSEC_SAR, "ipsec-reg", "ipsec sa acquire"); 331 332/* 333 * set parameters into secpolicyindex buffer. 334 * Must allocate secpolicyindex buffer passed to this function. 335 */ 336#define KEY_SETSECSPIDX(_dir, s, d, ps, pd, ulp, idx) \ 337do { \ 338 bzero((idx), sizeof(struct secpolicyindex)); \ 339 (idx)->dir = (_dir); \ 340 (idx)->prefs = (ps); \ 341 (idx)->prefd = (pd); \ 342 (idx)->ul_proto = (ulp); \ 343 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 344 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 345} while (0) 346 347/* 348 * set parameters into secasindex buffer. 349 * Must allocate secasindex buffer before calling this function. 350 */ 351#define KEY_SETSECASIDX(p, m, r, s, d, idx) \ 352do { \ 353 bzero((idx), sizeof(struct secasindex)); \ 354 (idx)->proto = (p); \ 355 (idx)->mode = (m); \ 356 (idx)->reqid = (r); \ 357 bcopy((s), &(idx)->src, ((const struct sockaddr *)(s))->sa_len); \ 358 bcopy((d), &(idx)->dst, ((const struct sockaddr *)(d))->sa_len); \ 359} while (0) 360 361/* key statistics */ 362struct _keystat { 363 u_long getspi_count; /* the avarage of count to try to get new SPI */ 364} keystat; 365 366struct sadb_msghdr { 367 struct sadb_msg *msg; 368 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 369 int extoff[SADB_EXT_MAX + 1]; 370 int extlen[SADB_EXT_MAX + 1]; 371}; 372 373static struct secasvar *key_allocsa_policy __P((const struct secasindex *)); 374static void key_freesp_so __P((struct secpolicy **)); 375static struct secasvar *key_do_allocsa_policy __P((struct secashead *, u_int)); 376static void key_delsp __P((struct secpolicy *)); 377static struct secpolicy *key_getsp __P((struct secpolicyindex *)); 378static void _key_delsp(struct secpolicy *sp); 379static struct secpolicy *key_getspbyid __P((u_int32_t)); 380static u_int32_t key_newreqid __P((void)); 381static struct mbuf *key_gather_mbuf __P((struct mbuf *, 382 const struct sadb_msghdr *, int, int, ...)); 383static int key_spdadd __P((struct socket *, struct mbuf *, 384 const struct sadb_msghdr *)); 385static u_int32_t key_getnewspid __P((void)); 386static int key_spddelete __P((struct socket *, struct mbuf *, 387 const struct sadb_msghdr *)); 388static int key_spddelete2 __P((struct socket *, struct mbuf *, 389 const struct sadb_msghdr *)); 390static int key_spdget __P((struct socket *, struct mbuf *, 391 const struct sadb_msghdr *)); 392static int key_spdflush __P((struct socket *, struct mbuf *, 393 const struct sadb_msghdr *)); 394static int key_spddump __P((struct socket *, struct mbuf *, 395 const struct sadb_msghdr *)); 396static struct mbuf *key_setdumpsp __P((struct secpolicy *, 397 u_int8_t, u_int32_t, u_int32_t)); 398static u_int key_getspreqmsglen __P((struct secpolicy *)); 399static int key_spdexpire __P((struct secpolicy *)); 400static struct secashead *key_newsah __P((struct secasindex *)); 401static void key_delsah __P((struct secashead *)); 402static struct secasvar *key_newsav __P((struct mbuf *, 403 const struct sadb_msghdr *, struct secashead *, int *, 404 const char*, int)); 405#define KEY_NEWSAV(m, sadb, sah, e) \ 406 key_newsav(m, sadb, sah, e, __FILE__, __LINE__) 407static void key_delsav __P((struct secasvar *)); 408static struct secashead *key_getsah __P((struct secasindex *)); 409static struct secasvar *key_checkspidup __P((struct secasindex *, u_int32_t)); 410static struct secasvar *key_getsavbyspi __P((struct secashead *, u_int32_t)); 411static int key_setsaval __P((struct secasvar *, struct mbuf *, 412 const struct sadb_msghdr *)); 413static int key_mature __P((struct secasvar *)); 414static struct mbuf *key_setdumpsa __P((struct secasvar *, u_int8_t, 415 u_int8_t, u_int32_t, u_int32_t)); 416static struct mbuf *key_setsadbmsg __P((u_int8_t, u_int16_t, u_int8_t, 417 u_int32_t, pid_t, u_int16_t)); 418static struct mbuf *key_setsadbsa __P((struct secasvar *)); 419static struct mbuf *key_setsadbaddr __P((u_int16_t, 420 const struct sockaddr *, u_int8_t, u_int16_t)); 421static struct mbuf *key_setsadbxsa2 __P((u_int8_t, u_int32_t, u_int32_t)); 422static struct mbuf *key_setsadbxpolicy __P((u_int16_t, u_int8_t, 423 u_int32_t)); 424static struct seckey *key_dup_keymsg(const struct sadb_key *, u_int, 425 struct malloc_type *); 426static struct seclifetime *key_dup_lifemsg(const struct sadb_lifetime *src, 427 struct malloc_type *type); 428#ifdef INET6 429static int key_ismyaddr6 __P((struct sockaddr_in6 *)); 430#endif 431 432/* flags for key_cmpsaidx() */ 433#define CMP_HEAD 1 /* protocol, addresses. */ 434#define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 435#define CMP_REQID 3 /* additionally HEAD, reaid. */ 436#define CMP_EXACTLY 4 /* all elements. */ 437static int key_cmpsaidx 438 __P((const struct secasindex *, const struct secasindex *, int)); 439 440static int key_cmpspidx_exactly 441 __P((struct secpolicyindex *, struct secpolicyindex *)); 442static int key_cmpspidx_withmask 443 __P((struct secpolicyindex *, struct secpolicyindex *)); 444static int key_sockaddrcmp __P((const struct sockaddr *, const struct sockaddr *, int)); 445static int key_bbcmp __P((const void *, const void *, u_int)); 446static u_int16_t key_satype2proto __P((u_int8_t)); 447static u_int8_t key_proto2satype __P((u_int16_t)); 448 449static int key_getspi __P((struct socket *, struct mbuf *, 450 const struct sadb_msghdr *)); 451static u_int32_t key_do_getnewspi __P((struct sadb_spirange *, 452 struct secasindex *)); 453static int key_update __P((struct socket *, struct mbuf *, 454 const struct sadb_msghdr *)); 455#ifdef IPSEC_DOSEQCHECK 456static struct secasvar *key_getsavbyseq __P((struct secashead *, u_int32_t)); 457#endif 458static int key_add __P((struct socket *, struct mbuf *, 459 const struct sadb_msghdr *)); 460static int key_setident __P((struct secashead *, struct mbuf *, 461 const struct sadb_msghdr *)); 462static struct mbuf *key_getmsgbuf_x1 __P((struct mbuf *, 463 const struct sadb_msghdr *)); 464static int key_delete __P((struct socket *, struct mbuf *, 465 const struct sadb_msghdr *)); 466static int key_get __P((struct socket *, struct mbuf *, 467 const struct sadb_msghdr *)); 468 469static void key_getcomb_setlifetime __P((struct sadb_comb *)); 470static struct mbuf *key_getcomb_esp __P((void)); 471static struct mbuf *key_getcomb_ah __P((void)); 472static struct mbuf *key_getcomb_ipcomp __P((void)); 473static struct mbuf *key_getprop __P((const struct secasindex *)); 474 475static int key_acquire __P((const struct secasindex *, struct secpolicy *)); 476static struct secacq *key_newacq __P((const struct secasindex *)); 477static struct secacq *key_getacq __P((const struct secasindex *)); 478static struct secacq *key_getacqbyseq __P((u_int32_t)); 479static struct secspacq *key_newspacq __P((struct secpolicyindex *)); 480static struct secspacq *key_getspacq __P((struct secpolicyindex *)); 481static int key_acquire2 __P((struct socket *, struct mbuf *, 482 const struct sadb_msghdr *)); 483static int key_register __P((struct socket *, struct mbuf *, 484 const struct sadb_msghdr *)); 485static int key_expire __P((struct secasvar *)); 486static int key_flush __P((struct socket *, struct mbuf *, 487 const struct sadb_msghdr *)); 488static int key_dump __P((struct socket *, struct mbuf *, 489 const struct sadb_msghdr *)); 490static int key_promisc __P((struct socket *, struct mbuf *, 491 const struct sadb_msghdr *)); 492static int key_senderror __P((struct socket *, struct mbuf *, int)); 493static int key_validate_ext __P((const struct sadb_ext *, int)); 494static int key_align __P((struct mbuf *, struct sadb_msghdr *)); 495static struct mbuf *key_setlifetime(struct seclifetime *src, 496 u_int16_t exttype); 497static struct mbuf *key_setkey(struct seckey *src, u_int16_t exttype); 498 499#if 0 500static const char *key_getfqdn __P((void)); 501static const char *key_getuserfqdn __P((void)); 502#endif 503static void key_sa_chgstate __P((struct secasvar *, u_int8_t)); 504static struct mbuf *key_alloc_mbuf __P((int)); 505 506static __inline void 507sa_initref(struct secasvar *sav) 508{ 509 510 refcount_init(&sav->refcnt, 1); 511} 512static __inline void 513sa_addref(struct secasvar *sav) 514{ 515 516 refcount_acquire(&sav->refcnt); 517 IPSEC_ASSERT(sav->refcnt != 0, ("SA refcnt overflow")); 518} 519static __inline int 520sa_delref(struct secasvar *sav) 521{ 522 523 IPSEC_ASSERT(sav->refcnt > 0, ("SA refcnt underflow")); 524 return (refcount_release(&sav->refcnt)); 525} 526 527#define SP_ADDREF(p) do { \ 528 (p)->refcnt++; \ 529 IPSEC_ASSERT((p)->refcnt != 0, ("SP refcnt overflow")); \ 530} while (0) 531#define SP_DELREF(p) do { \ 532 IPSEC_ASSERT((p)->refcnt > 0, ("SP refcnt underflow")); \ 533 (p)->refcnt--; \ 534} while (0) 535 536 537/* 538 * Update the refcnt while holding the SPTREE lock. 539 */ 540void 541key_addref(struct secpolicy *sp) 542{ 543 SPTREE_LOCK(); 544 SP_ADDREF(sp); 545 SPTREE_UNLOCK(); 546} 547 548/* 549 * Return 0 when there are known to be no SP's for the specified 550 * direction. Otherwise return 1. This is used by IPsec code 551 * to optimize performance. 552 */ 553int 554key_havesp(u_int dir) 555{ 556 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 557 LIST_FIRST(&sptree[dir]) != NULL : 1); 558} 559 560/* %%% IPsec policy management */ 561/* 562 * allocating a SP for OUTBOUND or INBOUND packet. 563 * Must call key_freesp() later. 564 * OUT: NULL: not found 565 * others: found and return the pointer. 566 */ 567struct secpolicy * 568key_allocsp(struct secpolicyindex *spidx, u_int dir, const char* where, int tag) 569{ 570 struct secpolicy *sp; 571 572 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 573 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 574 ("invalid direction %u", dir)); 575 576 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 577 printf("DP %s from %s:%u\n", __func__, where, tag)); 578 579 /* get a SP entry */ 580 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 581 printf("*** objects\n"); 582 kdebug_secpolicyindex(spidx)); 583 584 SPTREE_LOCK(); 585 LIST_FOREACH(sp, &sptree[dir], chain) { 586 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 587 printf("*** in SPD\n"); 588 kdebug_secpolicyindex(&sp->spidx)); 589 590 if (sp->state == IPSEC_SPSTATE_DEAD) 591 continue; 592 if (key_cmpspidx_withmask(&sp->spidx, spidx)) 593 goto found; 594 } 595 sp = NULL; 596found: 597 if (sp) { 598 /* sanity check */ 599 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 600 601 /* found a SPD entry */ 602 sp->lastused = time_second; 603 SP_ADDREF(sp); 604 } 605 SPTREE_UNLOCK(); 606 607 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 608 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 609 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 610 return sp; 611} 612 613/* 614 * allocating a SP for OUTBOUND or INBOUND packet. 615 * Must call key_freesp() later. 616 * OUT: NULL: not found 617 * others: found and return the pointer. 618 */ 619struct secpolicy * 620key_allocsp2(u_int32_t spi, 621 union sockaddr_union *dst, 622 u_int8_t proto, 623 u_int dir, 624 const char* where, int tag) 625{ 626 struct secpolicy *sp; 627 628 IPSEC_ASSERT(dst != NULL, ("null dst")); 629 IPSEC_ASSERT(dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND, 630 ("invalid direction %u", dir)); 631 632 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 633 printf("DP %s from %s:%u\n", __func__, where, tag)); 634 635 /* get a SP entry */ 636 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 637 printf("*** objects\n"); 638 printf("spi %u proto %u dir %u\n", spi, proto, dir); 639 kdebug_sockaddr(&dst->sa)); 640 641 SPTREE_LOCK(); 642 LIST_FOREACH(sp, &sptree[dir], chain) { 643 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 644 printf("*** in SPD\n"); 645 kdebug_secpolicyindex(&sp->spidx)); 646 647 if (sp->state == IPSEC_SPSTATE_DEAD) 648 continue; 649 /* compare simple values, then dst address */ 650 if (sp->spidx.ul_proto != proto) 651 continue; 652 /* NB: spi's must exist and match */ 653 if (!sp->req || !sp->req->sav || sp->req->sav->spi != spi) 654 continue; 655 if (key_sockaddrcmp(&sp->spidx.dst.sa, &dst->sa, 1) == 0) 656 goto found; 657 } 658 sp = NULL; 659found: 660 if (sp) { 661 /* sanity check */ 662 KEY_CHKSPDIR(sp->spidx.dir, dir, __func__); 663 664 /* found a SPD entry */ 665 sp->lastused = time_second; 666 SP_ADDREF(sp); 667 } 668 SPTREE_UNLOCK(); 669 670 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 671 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 672 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 673 return sp; 674} 675 676/* 677 * return a policy that matches this particular inbound packet. 678 * XXX slow 679 */ 680struct secpolicy * 681key_gettunnel(const struct sockaddr *osrc, 682 const struct sockaddr *odst, 683 const struct sockaddr *isrc, 684 const struct sockaddr *idst, 685 const char* where, int tag) 686{ 687 struct secpolicy *sp; 688 const int dir = IPSEC_DIR_INBOUND; 689 struct ipsecrequest *r1, *r2, *p; 690 struct secpolicyindex spidx; 691 692 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 693 printf("DP %s from %s:%u\n", __func__, where, tag)); 694 695 if (isrc->sa_family != idst->sa_family) { 696 ipseclog((LOG_ERR, "%s: protocol family mismatched %d != %d\n.", 697 __func__, isrc->sa_family, idst->sa_family)); 698 sp = NULL; 699 goto done; 700 } 701 702 SPTREE_LOCK(); 703 LIST_FOREACH(sp, &sptree[dir], chain) { 704 if (sp->state == IPSEC_SPSTATE_DEAD) 705 continue; 706 707 r1 = r2 = NULL; 708 for (p = sp->req; p; p = p->next) { 709 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 710 continue; 711 712 r1 = r2; 713 r2 = p; 714 715 if (!r1) { 716 /* here we look at address matches only */ 717 spidx = sp->spidx; 718 if (isrc->sa_len > sizeof(spidx.src) || 719 idst->sa_len > sizeof(spidx.dst)) 720 continue; 721 bcopy(isrc, &spidx.src, isrc->sa_len); 722 bcopy(idst, &spidx.dst, idst->sa_len); 723 if (!key_cmpspidx_withmask(&sp->spidx, &spidx)) 724 continue; 725 } else { 726 if (key_sockaddrcmp(&r1->saidx.src.sa, isrc, 0) || 727 key_sockaddrcmp(&r1->saidx.dst.sa, idst, 0)) 728 continue; 729 } 730 731 if (key_sockaddrcmp(&r2->saidx.src.sa, osrc, 0) || 732 key_sockaddrcmp(&r2->saidx.dst.sa, odst, 0)) 733 continue; 734 735 goto found; 736 } 737 } 738 sp = NULL; 739found: 740 if (sp) { 741 sp->lastused = time_second; 742 SP_ADDREF(sp); 743 } 744 SPTREE_UNLOCK(); 745done: 746 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 747 printf("DP %s return SP:%p (ID=%u) refcnt %u\n", __func__, 748 sp, sp ? sp->id : 0, sp ? sp->refcnt : 0)); 749 return sp; 750} 751 752/* 753 * allocating an SA entry for an *OUTBOUND* packet. 754 * checking each request entries in SP, and acquire an SA if need. 755 * OUT: 0: there are valid requests. 756 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 757 */ 758int 759key_checkrequest(struct ipsecrequest *isr, const struct secasindex *saidx) 760{ 761 u_int level; 762 int error; 763 764 IPSEC_ASSERT(isr != NULL, ("null isr")); 765 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 766 IPSEC_ASSERT(saidx->mode == IPSEC_MODE_TRANSPORT || 767 saidx->mode == IPSEC_MODE_TUNNEL, 768 ("unexpected policy %u", saidx->mode)); 769 770 /* 771 * XXX guard against protocol callbacks from the crypto 772 * thread as they reference ipsecrequest.sav which we 773 * temporarily null out below. Need to rethink how we 774 * handle bundled SA's in the callback thread. 775 */ 776 IPSECREQUEST_LOCK_ASSERT(isr); 777 778 /* get current level */ 779 level = ipsec_get_reqlevel(isr); 780#if 0 781 /* 782 * We do allocate new SA only if the state of SA in the holder is 783 * SADB_SASTATE_DEAD. The SA for outbound must be the oldest. 784 */ 785 if (isr->sav != NULL) { 786 if (isr->sav->sah == NULL) 787 panic("%s: sah is null.\n", __func__); 788 if (isr->sav == (struct secasvar *)LIST_FIRST( 789 &isr->sav->sah->savtree[SADB_SASTATE_DEAD])) { 790 KEY_FREESAV(&isr->sav); 791 isr->sav = NULL; 792 } 793 } 794#else 795 /* 796 * we free any SA stashed in the IPsec request because a different 797 * SA may be involved each time this request is checked, either 798 * because new SAs are being configured, or this request is 799 * associated with an unconnected datagram socket, or this request 800 * is associated with a system default policy. 801 * 802 * The operation may have negative impact to performance. We may 803 * want to check cached SA carefully, rather than picking new SA 804 * every time. 805 */ 806 if (isr->sav != NULL) { 807 KEY_FREESAV(&isr->sav); 808 isr->sav = NULL; 809 } 810#endif 811 812 /* 813 * new SA allocation if no SA found. 814 * key_allocsa_policy should allocate the oldest SA available. 815 * See key_do_allocsa_policy(), and draft-jenkins-ipsec-rekeying-03.txt. 816 */ 817 if (isr->sav == NULL) 818 isr->sav = key_allocsa_policy(saidx); 819 820 /* When there is SA. */ 821 if (isr->sav != NULL) { 822 if (isr->sav->state != SADB_SASTATE_MATURE && 823 isr->sav->state != SADB_SASTATE_DYING) 824 return EINVAL; 825 return 0; 826 } 827 828 /* there is no SA */ 829 error = key_acquire(saidx, isr->sp); 830 if (error != 0) { 831 /* XXX What should I do ? */ 832 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 833 __func__, error)); 834 return error; 835 } 836 837 if (level != IPSEC_LEVEL_REQUIRE) { 838 /* XXX sigh, the interface to this routine is botched */ 839 IPSEC_ASSERT(isr->sav == NULL, ("unexpected SA")); 840 return 0; 841 } else { 842 return ENOENT; 843 } 844} 845 846/* 847 * allocating a SA for policy entry from SAD. 848 * NOTE: searching SAD of aliving state. 849 * OUT: NULL: not found. 850 * others: found and return the pointer. 851 */ 852static struct secasvar * 853key_allocsa_policy(const struct secasindex *saidx) 854{ 855#define N(a) _ARRAYLEN(a) 856 struct secashead *sah; 857 struct secasvar *sav; 858 u_int stateidx, arraysize; 859 const u_int *state_valid; 860 861 SAHTREE_LOCK(); 862 LIST_FOREACH(sah, &sahtree, chain) { 863 if (sah->state == SADB_SASTATE_DEAD) 864 continue; 865 if (key_cmpsaidx(&sah->saidx, saidx, CMP_MODE_REQID)) { 866 if (key_preferred_oldsa) { 867 state_valid = saorder_state_valid_prefer_old; 868 arraysize = N(saorder_state_valid_prefer_old); 869 } else { 870 state_valid = saorder_state_valid_prefer_new; 871 arraysize = N(saorder_state_valid_prefer_new); 872 } 873 SAHTREE_UNLOCK(); 874 goto found; 875 } 876 } 877 SAHTREE_UNLOCK(); 878 879 return NULL; 880 881 found: 882 /* search valid state */ 883 for (stateidx = 0; stateidx < arraysize; stateidx++) { 884 sav = key_do_allocsa_policy(sah, state_valid[stateidx]); 885 if (sav != NULL) 886 return sav; 887 } 888 889 return NULL; 890#undef N 891} 892 893/* 894 * searching SAD with direction, protocol, mode and state. 895 * called by key_allocsa_policy(). 896 * OUT: 897 * NULL : not found 898 * others : found, pointer to a SA. 899 */ 900static struct secasvar * 901key_do_allocsa_policy(struct secashead *sah, u_int state) 902{ 903 struct secasvar *sav, *nextsav, *candidate, *d; 904 905 /* initilize */ 906 candidate = NULL; 907 908 SAHTREE_LOCK(); 909 for (sav = LIST_FIRST(&sah->savtree[state]); 910 sav != NULL; 911 sav = nextsav) { 912 913 nextsav = LIST_NEXT(sav, chain); 914 915 /* sanity check */ 916 KEY_CHKSASTATE(sav->state, state, __func__); 917 918 /* initialize */ 919 if (candidate == NULL) { 920 candidate = sav; 921 continue; 922 } 923 924 /* Which SA is the better ? */ 925 926 IPSEC_ASSERT(candidate->lft_c != NULL, 927 ("null candidate lifetime")); 928 IPSEC_ASSERT(sav->lft_c != NULL, ("null sav lifetime")); 929 930 /* What the best method is to compare ? */ 931 if (key_preferred_oldsa) { 932 if (candidate->lft_c->addtime > 933 sav->lft_c->addtime) { 934 candidate = sav; 935 } 936 continue; 937 /*NOTREACHED*/ 938 } 939 940 /* preferred new sa rather than old sa */ 941 if (candidate->lft_c->addtime < 942 sav->lft_c->addtime) { 943 d = candidate; 944 candidate = sav; 945 } else 946 d = sav; 947 948 /* 949 * prepared to delete the SA when there is more 950 * suitable candidate and the lifetime of the SA is not 951 * permanent. 952 */ 953 if (d->lft_c->addtime != 0) { 954 struct mbuf *m, *result; 955 u_int8_t satype; 956 957 key_sa_chgstate(d, SADB_SASTATE_DEAD); 958 959 IPSEC_ASSERT(d->refcnt > 0, ("bogus ref count")); 960 961 satype = key_proto2satype(d->sah->saidx.proto); 962 if (satype == 0) 963 goto msgfail; 964 965 m = key_setsadbmsg(SADB_DELETE, 0, 966 satype, 0, 0, d->refcnt - 1); 967 if (!m) 968 goto msgfail; 969 result = m; 970 971 /* set sadb_address for saidx's. */ 972 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 973 &d->sah->saidx.src.sa, 974 d->sah->saidx.src.sa.sa_len << 3, 975 IPSEC_ULPROTO_ANY); 976 if (!m) 977 goto msgfail; 978 m_cat(result, m); 979 980 /* set sadb_address for saidx's. */ 981 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 982 &d->sah->saidx.dst.sa, 983 d->sah->saidx.dst.sa.sa_len << 3, 984 IPSEC_ULPROTO_ANY); 985 if (!m) 986 goto msgfail; 987 m_cat(result, m); 988 989 /* create SA extension */ 990 m = key_setsadbsa(d); 991 if (!m) 992 goto msgfail; 993 m_cat(result, m); 994 995 if (result->m_len < sizeof(struct sadb_msg)) { 996 result = m_pullup(result, 997 sizeof(struct sadb_msg)); 998 if (result == NULL) 999 goto msgfail; 1000 } 1001 1002 result->m_pkthdr.len = 0; 1003 for (m = result; m; m = m->m_next) 1004 result->m_pkthdr.len += m->m_len; 1005 mtod(result, struct sadb_msg *)->sadb_msg_len = 1006 PFKEY_UNIT64(result->m_pkthdr.len); 1007 1008 if (key_sendup_mbuf(NULL, result, 1009 KEY_SENDUP_REGISTERED)) 1010 goto msgfail; 1011 msgfail: 1012 KEY_FREESAV(&d); 1013 } 1014 } 1015 if (candidate) { 1016 sa_addref(candidate); 1017 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1018 printf("DP %s cause refcnt++:%d SA:%p\n", 1019 __func__, candidate->refcnt, candidate)); 1020 } 1021 SAHTREE_UNLOCK(); 1022 1023 return candidate; 1024} 1025 1026/* 1027 * allocating a usable SA entry for a *INBOUND* packet. 1028 * Must call key_freesav() later. 1029 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 1030 * NULL: not found, or error occured. 1031 * 1032 * In the comparison, no source address is used--for RFC2401 conformance. 1033 * To quote, from section 4.1: 1034 * A security association is uniquely identified by a triple consisting 1035 * of a Security Parameter Index (SPI), an IP Destination Address, and a 1036 * security protocol (AH or ESP) identifier. 1037 * Note that, however, we do need to keep source address in IPsec SA. 1038 * IKE specification and PF_KEY specification do assume that we 1039 * keep source address in IPsec SA. We see a tricky situation here. 1040 */ 1041struct secasvar * 1042key_allocsa( 1043 union sockaddr_union *dst, 1044 u_int proto, 1045 u_int32_t spi, 1046 const char* where, int tag) 1047{ 1048 struct secashead *sah; 1049 struct secasvar *sav; 1050 u_int stateidx, arraysize, state; 1051 const u_int *saorder_state_valid; 1052 1053 IPSEC_ASSERT(dst != NULL, ("null dst address")); 1054 1055 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1056 printf("DP %s from %s:%u\n", __func__, where, tag)); 1057 1058 /* 1059 * searching SAD. 1060 * XXX: to be checked internal IP header somewhere. Also when 1061 * IPsec tunnel packet is received. But ESP tunnel mode is 1062 * encrypted so we can't check internal IP header. 1063 */ 1064 SAHTREE_LOCK(); 1065 if (key_preferred_oldsa) { 1066 saorder_state_valid = saorder_state_valid_prefer_old; 1067 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1068 } else { 1069 saorder_state_valid = saorder_state_valid_prefer_new; 1070 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1071 } 1072 LIST_FOREACH(sah, &sahtree, chain) { 1073 /* search valid state */ 1074 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1075 state = saorder_state_valid[stateidx]; 1076 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1077 /* sanity check */ 1078 KEY_CHKSASTATE(sav->state, state, __func__); 1079 /* do not return entries w/ unusable state */ 1080 if (sav->state != SADB_SASTATE_MATURE && 1081 sav->state != SADB_SASTATE_DYING) 1082 continue; 1083 if (proto != sav->sah->saidx.proto) 1084 continue; 1085 if (spi != sav->spi) 1086 continue; 1087#if 0 /* don't check src */ 1088 /* check src address */ 1089 if (key_sockaddrcmp(&src->sa, &sav->sah->saidx.src.sa, 0) != 0) 1090 continue; 1091#endif 1092 /* check dst address */ 1093 if (key_sockaddrcmp(&dst->sa, &sav->sah->saidx.dst.sa, 0) != 0) 1094 continue; 1095 sa_addref(sav); 1096 goto done; 1097 } 1098 } 1099 } 1100 sav = NULL; 1101done: 1102 SAHTREE_UNLOCK(); 1103 1104 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1105 printf("DP %s return SA:%p; refcnt %u\n", __func__, 1106 sav, sav ? sav->refcnt : 0)); 1107 return sav; 1108} 1109 1110/* 1111 * Must be called after calling key_allocsp(). 1112 * For both the packet without socket and key_freeso(). 1113 */ 1114void 1115_key_freesp(struct secpolicy **spp, const char* where, int tag) 1116{ 1117 struct secpolicy *sp = *spp; 1118 1119 IPSEC_ASSERT(sp != NULL, ("null sp")); 1120 1121 SPTREE_LOCK(); 1122 SP_DELREF(sp); 1123 1124 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1125 printf("DP %s SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1126 __func__, sp, sp->id, where, tag, sp->refcnt)); 1127 1128 if (sp->refcnt == 0) { 1129 *spp = NULL; 1130 key_delsp(sp); 1131 } 1132 SPTREE_UNLOCK(); 1133} 1134 1135/* 1136 * Must be called after calling key_allocsp(). 1137 * For the packet with socket. 1138 */ 1139void 1140key_freeso(struct socket *so) 1141{ 1142 IPSEC_ASSERT(so != NULL, ("null so")); 1143 1144 switch (so->so_proto->pr_domain->dom_family) { 1145#ifdef INET 1146 case PF_INET: 1147 { 1148 struct inpcb *pcb = sotoinpcb(so); 1149 1150 /* Does it have a PCB ? */ 1151 if (pcb == NULL) 1152 return; 1153 key_freesp_so(&pcb->inp_sp->sp_in); 1154 key_freesp_so(&pcb->inp_sp->sp_out); 1155 } 1156 break; 1157#endif 1158#ifdef INET6 1159 case PF_INET6: 1160 { 1161#ifdef HAVE_NRL_INPCB 1162 struct inpcb *pcb = sotoinpcb(so); 1163 1164 /* Does it have a PCB ? */ 1165 if (pcb == NULL) 1166 return; 1167 key_freesp_so(&pcb->inp_sp->sp_in); 1168 key_freesp_so(&pcb->inp_sp->sp_out); 1169#else 1170 struct in6pcb *pcb = sotoin6pcb(so); 1171 1172 /* Does it have a PCB ? */ 1173 if (pcb == NULL) 1174 return; 1175 key_freesp_so(&pcb->in6p_sp->sp_in); 1176 key_freesp_so(&pcb->in6p_sp->sp_out); 1177#endif 1178 } 1179 break; 1180#endif /* 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 struct secasvar *sav = *psav; 1211 1212 IPSEC_ASSERT(sav != NULL, ("null sav")); 1213 1214 if (sa_delref(sav)) { 1215 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1216 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1217 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1218 *psav = NULL; 1219 key_delsav(sav); 1220 } else { 1221 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1222 printf("DP %s SA:%p (SPI %u) from %s:%u; refcnt now %u\n", 1223 __func__, sav, ntohl(sav->spi), where, tag, sav->refcnt)); 1224 } 1225} 1226 1227/* %%% SPD management */ 1228/* 1229 * free security policy entry. 1230 */ 1231static void 1232key_delsp(struct secpolicy *sp) 1233{ 1234 struct ipsecrequest *isr, *nextisr; 1235 1236 IPSEC_ASSERT(sp != NULL, ("null sp")); 1237 SPTREE_LOCK_ASSERT(); 1238 1239 sp->state = IPSEC_SPSTATE_DEAD; 1240 1241 IPSEC_ASSERT(sp->refcnt == 0, 1242 ("SP with references deleted (refcnt %u)", sp->refcnt)); 1243 1244 /* remove from SP index */ 1245 if (__LIST_CHAINED(sp)) 1246 LIST_REMOVE(sp, chain); 1247 1248 for (isr = sp->req; isr != NULL; isr = nextisr) { 1249 if (isr->sav != NULL) { 1250 KEY_FREESAV(&isr->sav); 1251 isr->sav = NULL; 1252 } 1253 1254 nextisr = isr->next; 1255 ipsec_delisr(isr); 1256 } 1257 _key_delsp(sp); 1258} 1259 1260/* 1261 * search SPD 1262 * OUT: NULL : not found 1263 * others : found, pointer to a SP. 1264 */ 1265static struct secpolicy * 1266key_getsp(struct secpolicyindex *spidx) 1267{ 1268 struct secpolicy *sp; 1269 1270 IPSEC_ASSERT(spidx != NULL, ("null spidx")); 1271 1272 SPTREE_LOCK(); 1273 LIST_FOREACH(sp, &sptree[spidx->dir], chain) { 1274 if (sp->state == IPSEC_SPSTATE_DEAD) 1275 continue; 1276 if (key_cmpspidx_exactly(spidx, &sp->spidx)) { 1277 SP_ADDREF(sp); 1278 break; 1279 } 1280 } 1281 SPTREE_UNLOCK(); 1282 1283 return sp; 1284} 1285 1286/* 1287 * get SP by index. 1288 * OUT: NULL : not found 1289 * others : found, pointer to a SP. 1290 */ 1291static struct secpolicy * 1292key_getspbyid(u_int32_t id) 1293{ 1294 struct secpolicy *sp; 1295 1296 SPTREE_LOCK(); 1297 LIST_FOREACH(sp, &sptree[IPSEC_DIR_INBOUND], chain) { 1298 if (sp->state == IPSEC_SPSTATE_DEAD) 1299 continue; 1300 if (sp->id == id) { 1301 SP_ADDREF(sp); 1302 goto done; 1303 } 1304 } 1305 1306 LIST_FOREACH(sp, &sptree[IPSEC_DIR_OUTBOUND], chain) { 1307 if (sp->state == IPSEC_SPSTATE_DEAD) 1308 continue; 1309 if (sp->id == id) { 1310 SP_ADDREF(sp); 1311 goto done; 1312 } 1313 } 1314done: 1315 SPTREE_UNLOCK(); 1316 1317 return sp; 1318} 1319 1320struct secpolicy * 1321key_newsp(const char* where, int tag) 1322{ 1323 struct secpolicy *newsp = NULL; 1324 1325 newsp = (struct secpolicy *) 1326 malloc(sizeof(struct secpolicy), M_IPSEC_SP, M_NOWAIT|M_ZERO); 1327 if (newsp) { 1328 SECPOLICY_LOCK_INIT(newsp); 1329 newsp->refcnt = 1; 1330 newsp->req = NULL; 1331 } 1332 1333 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 1334 printf("DP %s from %s:%u return SP:%p\n", __func__, 1335 where, tag, newsp)); 1336 return newsp; 1337} 1338 1339static void 1340_key_delsp(struct secpolicy *sp) 1341{ 1342 SECPOLICY_LOCK_DESTROY(sp); 1343 free(sp, M_IPSEC_SP); 1344} 1345 1346/* 1347 * create secpolicy structure from sadb_x_policy structure. 1348 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1349 * so must be set properly later. 1350 */ 1351struct secpolicy * 1352key_msg2sp(xpl0, len, error) 1353 struct sadb_x_policy *xpl0; 1354 size_t len; 1355 int *error; 1356{ 1357 struct secpolicy *newsp; 1358 1359 IPSEC_ASSERT(xpl0 != NULL, ("null xpl0")); 1360 IPSEC_ASSERT(len >= sizeof(*xpl0), ("policy too short: %zu", len)); 1361 1362 if (len != PFKEY_EXTLEN(xpl0)) { 1363 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", __func__)); 1364 *error = EINVAL; 1365 return NULL; 1366 } 1367 1368 if ((newsp = KEY_NEWSP()) == NULL) { 1369 *error = ENOBUFS; 1370 return NULL; 1371 } 1372 1373 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1374 newsp->policy = xpl0->sadb_x_policy_type; 1375 1376 /* check policy */ 1377 switch (xpl0->sadb_x_policy_type) { 1378 case IPSEC_POLICY_DISCARD: 1379 case IPSEC_POLICY_NONE: 1380 case IPSEC_POLICY_ENTRUST: 1381 case IPSEC_POLICY_BYPASS: 1382 newsp->req = NULL; 1383 break; 1384 1385 case IPSEC_POLICY_IPSEC: 1386 { 1387 int tlen; 1388 struct sadb_x_ipsecrequest *xisr; 1389 struct ipsecrequest **p_isr = &newsp->req; 1390 1391 /* validity check */ 1392 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1393 ipseclog((LOG_DEBUG, "%s: Invalid msg length.\n", 1394 __func__)); 1395 KEY_FREESP(&newsp); 1396 *error = EINVAL; 1397 return NULL; 1398 } 1399 1400 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1401 xisr = (struct sadb_x_ipsecrequest *)(xpl0 + 1); 1402 1403 while (tlen > 0) { 1404 /* length check */ 1405 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1406 ipseclog((LOG_DEBUG, "%s: invalid ipsecrequest " 1407 "length.\n", __func__)); 1408 KEY_FREESP(&newsp); 1409 *error = EINVAL; 1410 return NULL; 1411 } 1412 1413 /* allocate request buffer */ 1414 /* NB: data structure is zero'd */ 1415 *p_isr = ipsec_newisr(); 1416 if ((*p_isr) == NULL) { 1417 ipseclog((LOG_DEBUG, 1418 "%s: No more memory.\n", __func__)); 1419 KEY_FREESP(&newsp); 1420 *error = ENOBUFS; 1421 return NULL; 1422 } 1423 1424 /* set values */ 1425 switch (xisr->sadb_x_ipsecrequest_proto) { 1426 case IPPROTO_ESP: 1427 case IPPROTO_AH: 1428 case IPPROTO_IPCOMP: 1429 break; 1430 default: 1431 ipseclog((LOG_DEBUG, 1432 "%s: invalid proto type=%u\n", __func__, 1433 xisr->sadb_x_ipsecrequest_proto)); 1434 KEY_FREESP(&newsp); 1435 *error = EPROTONOSUPPORT; 1436 return NULL; 1437 } 1438 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1439 1440 switch (xisr->sadb_x_ipsecrequest_mode) { 1441 case IPSEC_MODE_TRANSPORT: 1442 case IPSEC_MODE_TUNNEL: 1443 break; 1444 case IPSEC_MODE_ANY: 1445 default: 1446 ipseclog((LOG_DEBUG, 1447 "%s: invalid mode=%u\n", __func__, 1448 xisr->sadb_x_ipsecrequest_mode)); 1449 KEY_FREESP(&newsp); 1450 *error = EINVAL; 1451 return NULL; 1452 } 1453 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1454 1455 switch (xisr->sadb_x_ipsecrequest_level) { 1456 case IPSEC_LEVEL_DEFAULT: 1457 case IPSEC_LEVEL_USE: 1458 case IPSEC_LEVEL_REQUIRE: 1459 break; 1460 case IPSEC_LEVEL_UNIQUE: 1461 /* validity check */ 1462 /* 1463 * If range violation of reqid, kernel will 1464 * update it, don't refuse it. 1465 */ 1466 if (xisr->sadb_x_ipsecrequest_reqid 1467 > IPSEC_MANUAL_REQID_MAX) { 1468 ipseclog((LOG_DEBUG, 1469 "%s: reqid=%d range " 1470 "violation, updated by kernel.\n", 1471 __func__, 1472 xisr->sadb_x_ipsecrequest_reqid)); 1473 xisr->sadb_x_ipsecrequest_reqid = 0; 1474 } 1475 1476 /* allocate new reqid id if reqid is zero. */ 1477 if (xisr->sadb_x_ipsecrequest_reqid == 0) { 1478 u_int32_t reqid; 1479 if ((reqid = key_newreqid()) == 0) { 1480 KEY_FREESP(&newsp); 1481 *error = ENOBUFS; 1482 return NULL; 1483 } 1484 (*p_isr)->saidx.reqid = reqid; 1485 xisr->sadb_x_ipsecrequest_reqid = reqid; 1486 } else { 1487 /* set it for manual keying. */ 1488 (*p_isr)->saidx.reqid = 1489 xisr->sadb_x_ipsecrequest_reqid; 1490 } 1491 break; 1492 1493 default: 1494 ipseclog((LOG_DEBUG, "%s: invalid level=%u\n", 1495 __func__, 1496 xisr->sadb_x_ipsecrequest_level)); 1497 KEY_FREESP(&newsp); 1498 *error = EINVAL; 1499 return NULL; 1500 } 1501 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1502 1503 /* set IP addresses if there */ 1504 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1505 struct sockaddr *paddr; 1506 1507 paddr = (struct sockaddr *)(xisr + 1); 1508 1509 /* validity check */ 1510 if (paddr->sa_len 1511 > sizeof((*p_isr)->saidx.src)) { 1512 ipseclog((LOG_DEBUG, "%s: invalid " 1513 "request address length.\n", 1514 __func__)); 1515 KEY_FREESP(&newsp); 1516 *error = EINVAL; 1517 return NULL; 1518 } 1519 bcopy(paddr, &(*p_isr)->saidx.src, 1520 paddr->sa_len); 1521 1522 paddr = (struct sockaddr *)((caddr_t)paddr 1523 + paddr->sa_len); 1524 1525 /* validity check */ 1526 if (paddr->sa_len 1527 > sizeof((*p_isr)->saidx.dst)) { 1528 ipseclog((LOG_DEBUG, "%s: invalid " 1529 "request address length.\n", 1530 __func__)); 1531 KEY_FREESP(&newsp); 1532 *error = EINVAL; 1533 return NULL; 1534 } 1535 bcopy(paddr, &(*p_isr)->saidx.dst, 1536 paddr->sa_len); 1537 } 1538 1539 (*p_isr)->sp = newsp; 1540 1541 /* initialization for the next. */ 1542 p_isr = &(*p_isr)->next; 1543 tlen -= xisr->sadb_x_ipsecrequest_len; 1544 1545 /* validity check */ 1546 if (tlen < 0) { 1547 ipseclog((LOG_DEBUG, "%s: becoming tlen < 0.\n", 1548 __func__)); 1549 KEY_FREESP(&newsp); 1550 *error = EINVAL; 1551 return NULL; 1552 } 1553 1554 xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xisr 1555 + xisr->sadb_x_ipsecrequest_len); 1556 } 1557 } 1558 break; 1559 default: 1560 ipseclog((LOG_DEBUG, "%s: invalid policy type.\n", __func__)); 1561 KEY_FREESP(&newsp); 1562 *error = EINVAL; 1563 return NULL; 1564 } 1565 1566 *error = 0; 1567 return newsp; 1568} 1569 1570static u_int32_t 1571key_newreqid() 1572{ 1573 static u_int32_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1574 1575 auto_reqid = (auto_reqid == ~0 1576 ? IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1577 1578 /* XXX should be unique check */ 1579 1580 return auto_reqid; 1581} 1582 1583/* 1584 * copy secpolicy struct to sadb_x_policy structure indicated. 1585 */ 1586struct mbuf * 1587key_sp2msg(sp) 1588 struct secpolicy *sp; 1589{ 1590 struct sadb_x_policy *xpl; 1591 int tlen; 1592 caddr_t p; 1593 struct mbuf *m; 1594 1595 IPSEC_ASSERT(sp != NULL, ("null policy")); 1596 1597 tlen = key_getspreqmsglen(sp); 1598 1599 m = key_alloc_mbuf(tlen); 1600 if (!m || m->m_next) { /*XXX*/ 1601 if (m) 1602 m_freem(m); 1603 return NULL; 1604 } 1605 1606 m->m_len = tlen; 1607 m->m_next = NULL; 1608 xpl = mtod(m, struct sadb_x_policy *); 1609 bzero(xpl, tlen); 1610 1611 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1612 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1613 xpl->sadb_x_policy_type = sp->policy; 1614 xpl->sadb_x_policy_dir = sp->spidx.dir; 1615 xpl->sadb_x_policy_id = sp->id; 1616 p = (caddr_t)xpl + sizeof(*xpl); 1617 1618 /* if is the policy for ipsec ? */ 1619 if (sp->policy == IPSEC_POLICY_IPSEC) { 1620 struct sadb_x_ipsecrequest *xisr; 1621 struct ipsecrequest *isr; 1622 1623 for (isr = sp->req; isr != NULL; isr = isr->next) { 1624 1625 xisr = (struct sadb_x_ipsecrequest *)p; 1626 1627 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1628 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1629 xisr->sadb_x_ipsecrequest_level = isr->level; 1630 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1631 1632 p += sizeof(*xisr); 1633 bcopy(&isr->saidx.src, p, isr->saidx.src.sa.sa_len); 1634 p += isr->saidx.src.sa.sa_len; 1635 bcopy(&isr->saidx.dst, p, isr->saidx.dst.sa.sa_len); 1636 p += isr->saidx.src.sa.sa_len; 1637 1638 xisr->sadb_x_ipsecrequest_len = 1639 PFKEY_ALIGN8(sizeof(*xisr) 1640 + isr->saidx.src.sa.sa_len 1641 + isr->saidx.dst.sa.sa_len); 1642 } 1643 } 1644 1645 return m; 1646} 1647 1648/* m will not be freed nor modified */ 1649static struct mbuf * 1650#ifdef __STDC__ 1651key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1652 int ndeep, int nitem, ...) 1653#else 1654key_gather_mbuf(m, mhp, ndeep, nitem, va_alist) 1655 struct mbuf *m; 1656 const struct sadb_msghdr *mhp; 1657 int ndeep; 1658 int nitem; 1659 va_dcl 1660#endif 1661{ 1662 va_list ap; 1663 int idx; 1664 int i; 1665 struct mbuf *result = NULL, *n; 1666 int len; 1667 1668 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1669 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1670 1671 va_start(ap, nitem); 1672 for (i = 0; i < nitem; i++) { 1673 idx = va_arg(ap, int); 1674 if (idx < 0 || idx > SADB_EXT_MAX) 1675 goto fail; 1676 /* don't attempt to pull empty extension */ 1677 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1678 continue; 1679 if (idx != SADB_EXT_RESERVED && 1680 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1681 continue; 1682 1683 if (idx == SADB_EXT_RESERVED) { 1684 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1685 1686 IPSEC_ASSERT(len <= MHLEN, ("header too big %u", len)); 1687 1688 MGETHDR(n, M_DONTWAIT, MT_DATA); 1689 if (!n) 1690 goto fail; 1691 n->m_len = len; 1692 n->m_next = NULL; 1693 m_copydata(m, 0, sizeof(struct sadb_msg), 1694 mtod(n, caddr_t)); 1695 } else if (i < ndeep) { 1696 len = mhp->extlen[idx]; 1697 n = key_alloc_mbuf(len); 1698 if (!n || n->m_next) { /*XXX*/ 1699 if (n) 1700 m_freem(n); 1701 goto fail; 1702 } 1703 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1704 mtod(n, caddr_t)); 1705 } else { 1706 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1707 M_DONTWAIT); 1708 } 1709 if (n == NULL) 1710 goto fail; 1711 1712 if (result) 1713 m_cat(result, n); 1714 else 1715 result = n; 1716 } 1717 va_end(ap); 1718 1719 if ((result->m_flags & M_PKTHDR) != 0) { 1720 result->m_pkthdr.len = 0; 1721 for (n = result; n; n = n->m_next) 1722 result->m_pkthdr.len += n->m_len; 1723 } 1724 1725 return result; 1726 1727fail: 1728 m_freem(result); 1729 return NULL; 1730} 1731 1732/* 1733 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1734 * add an entry to SP database, when received 1735 * <base, address(SD), (lifetime(H),) policy> 1736 * from the user(?). 1737 * Adding to SP database, 1738 * and send 1739 * <base, address(SD), (lifetime(H),) policy> 1740 * to the socket which was send. 1741 * 1742 * SPDADD set a unique policy entry. 1743 * SPDSETIDX like SPDADD without a part of policy requests. 1744 * SPDUPDATE replace a unique policy entry. 1745 * 1746 * m will always be freed. 1747 */ 1748static int 1749key_spdadd(so, m, mhp) 1750 struct socket *so; 1751 struct mbuf *m; 1752 const struct sadb_msghdr *mhp; 1753{ 1754 struct sadb_address *src0, *dst0; 1755 struct sadb_x_policy *xpl0, *xpl; 1756 struct sadb_lifetime *lft = NULL; 1757 struct secpolicyindex spidx; 1758 struct secpolicy *newsp; 1759 int error; 1760 1761 IPSEC_ASSERT(so != NULL, ("null socket")); 1762 IPSEC_ASSERT(m != NULL, ("null mbuf")); 1763 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 1764 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 1765 1766 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1767 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1768 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1769 ipseclog((LOG_DEBUG, "key_spdadd: invalid message is passed.\n")); 1770 return key_senderror(so, m, EINVAL); 1771 } 1772 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1773 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1774 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1775 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1776 __func__)); 1777 return key_senderror(so, m, EINVAL); 1778 } 1779 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1780 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] 1781 < sizeof(struct sadb_lifetime)) { 1782 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 1783 __func__)); 1784 return key_senderror(so, m, EINVAL); 1785 } 1786 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1787 } 1788 1789 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 1790 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 1791 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1792 1793 /* make secindex */ 1794 /* XXX boundary check against sa_len */ 1795 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1796 src0 + 1, 1797 dst0 + 1, 1798 src0->sadb_address_prefixlen, 1799 dst0->sadb_address_prefixlen, 1800 src0->sadb_address_proto, 1801 &spidx); 1802 1803 /* checking the direciton. */ 1804 switch (xpl0->sadb_x_policy_dir) { 1805 case IPSEC_DIR_INBOUND: 1806 case IPSEC_DIR_OUTBOUND: 1807 break; 1808 default: 1809 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 1810 mhp->msg->sadb_msg_errno = EINVAL; 1811 return 0; 1812 } 1813 1814 /* check policy */ 1815 /* key_spdadd() accepts DISCARD, NONE and IPSEC. */ 1816 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST 1817 || xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1818 ipseclog((LOG_DEBUG, "%s: Invalid policy type.\n", __func__)); 1819 return key_senderror(so, m, EINVAL); 1820 } 1821 1822 /* policy requests are mandatory when action is ipsec. */ 1823 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX 1824 && xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC 1825 && mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1826 ipseclog((LOG_DEBUG, "%s: some policy requests part required\n", 1827 __func__)); 1828 return key_senderror(so, m, EINVAL); 1829 } 1830 1831 /* 1832 * checking there is SP already or not. 1833 * SPDUPDATE doesn't depend on whether there is a SP or not. 1834 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1835 * then error. 1836 */ 1837 newsp = key_getsp(&spidx); 1838 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1839 if (newsp) { 1840 newsp->state = IPSEC_SPSTATE_DEAD; 1841 KEY_FREESP(&newsp); 1842 } 1843 } else { 1844 if (newsp != NULL) { 1845 KEY_FREESP(&newsp); 1846 ipseclog((LOG_DEBUG, "%s: a SP entry exists already.\n", 1847 __func__)); 1848 return key_senderror(so, m, EEXIST); 1849 } 1850 } 1851 1852 /* allocation new SP entry */ 1853 if ((newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error)) == NULL) { 1854 return key_senderror(so, m, error); 1855 } 1856 1857 if ((newsp->id = key_getnewspid()) == 0) { 1858 _key_delsp(newsp); 1859 return key_senderror(so, m, ENOBUFS); 1860 } 1861 1862 /* XXX boundary check against sa_len */ 1863 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 1864 src0 + 1, 1865 dst0 + 1, 1866 src0->sadb_address_prefixlen, 1867 dst0->sadb_address_prefixlen, 1868 src0->sadb_address_proto, 1869 &newsp->spidx); 1870 1871 /* sanity check on addr pair */ 1872 if (((struct sockaddr *)(src0 + 1))->sa_family != 1873 ((struct sockaddr *)(dst0+ 1))->sa_family) { 1874 _key_delsp(newsp); 1875 return key_senderror(so, m, EINVAL); 1876 } 1877 if (((struct sockaddr *)(src0 + 1))->sa_len != 1878 ((struct sockaddr *)(dst0+ 1))->sa_len) { 1879 _key_delsp(newsp); 1880 return key_senderror(so, m, EINVAL); 1881 } 1882#if 1 1883 if (newsp->req && newsp->req->saidx.src.sa.sa_family) { 1884 struct sockaddr *sa; 1885 sa = (struct sockaddr *)(src0 + 1); 1886 if (sa->sa_family != newsp->req->saidx.src.sa.sa_family) { 1887 _key_delsp(newsp); 1888 return key_senderror(so, m, EINVAL); 1889 } 1890 } 1891 if (newsp->req && newsp->req->saidx.dst.sa.sa_family) { 1892 struct sockaddr *sa; 1893 sa = (struct sockaddr *)(dst0 + 1); 1894 if (sa->sa_family != newsp->req->saidx.dst.sa.sa_family) { 1895 _key_delsp(newsp); 1896 return key_senderror(so, m, EINVAL); 1897 } 1898 } 1899#endif 1900 1901 newsp->created = time_second; 1902 newsp->lastused = newsp->created; 1903 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1904 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1905 1906 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1907 newsp->state = IPSEC_SPSTATE_ALIVE; 1908 LIST_INSERT_TAIL(&sptree[newsp->spidx.dir], newsp, secpolicy, chain); 1909 1910 /* delete the entry in spacqtree */ 1911 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1912 struct secspacq *spacq = key_getspacq(&spidx); 1913 if (spacq != NULL) { 1914 /* reset counter in order to deletion by timehandler. */ 1915 spacq->created = time_second; 1916 spacq->count = 0; 1917 SPACQ_UNLOCK(); 1918 } 1919 } 1920 1921 { 1922 struct mbuf *n, *mpolicy; 1923 struct sadb_msg *newmsg; 1924 int off; 1925 1926 /* create new sadb_msg to reply. */ 1927 if (lft) { 1928 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1929 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1930 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1931 } else { 1932 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1933 SADB_X_EXT_POLICY, 1934 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1935 } 1936 if (!n) 1937 return key_senderror(so, m, ENOBUFS); 1938 1939 if (n->m_len < sizeof(*newmsg)) { 1940 n = m_pullup(n, sizeof(*newmsg)); 1941 if (!n) 1942 return key_senderror(so, m, ENOBUFS); 1943 } 1944 newmsg = mtod(n, struct sadb_msg *); 1945 newmsg->sadb_msg_errno = 0; 1946 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 1947 1948 off = 0; 1949 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1950 sizeof(*xpl), &off); 1951 if (mpolicy == NULL) { 1952 /* n is already freed */ 1953 return key_senderror(so, m, ENOBUFS); 1954 } 1955 xpl = (struct sadb_x_policy *)(mtod(mpolicy, caddr_t) + off); 1956 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1957 m_freem(n); 1958 return key_senderror(so, m, EINVAL); 1959 } 1960 xpl->sadb_x_policy_id = newsp->id; 1961 1962 m_freem(m); 1963 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1964 } 1965} 1966 1967/* 1968 * get new policy id. 1969 * OUT: 1970 * 0: failure. 1971 * others: success. 1972 */ 1973static u_int32_t 1974key_getnewspid() 1975{ 1976 u_int32_t newid = 0; 1977 int count = key_spi_trycnt; /* XXX */ 1978 struct secpolicy *sp; 1979 1980 /* when requesting to allocate spi ranged */ 1981 while (count--) { 1982 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1)); 1983 1984 if ((sp = key_getspbyid(newid)) == NULL) 1985 break; 1986 1987 KEY_FREESP(&sp); 1988 } 1989 1990 if (count == 0 || newid == 0) { 1991 ipseclog((LOG_DEBUG, "%s: to allocate policy id is failed.\n", 1992 __func__)); 1993 return 0; 1994 } 1995 1996 return newid; 1997} 1998 1999/* 2000 * SADB_SPDDELETE processing 2001 * receive 2002 * <base, address(SD), policy(*)> 2003 * from the user(?), and set SADB_SASTATE_DEAD, 2004 * and send, 2005 * <base, address(SD), policy(*)> 2006 * to the ikmpd. 2007 * policy(*) including direction of policy. 2008 * 2009 * m will always be freed. 2010 */ 2011static int 2012key_spddelete(so, m, mhp) 2013 struct socket *so; 2014 struct mbuf *m; 2015 const struct sadb_msghdr *mhp; 2016{ 2017 struct sadb_address *src0, *dst0; 2018 struct sadb_x_policy *xpl0; 2019 struct secpolicyindex spidx; 2020 struct secpolicy *sp; 2021 2022 IPSEC_ASSERT(so != NULL, ("null so")); 2023 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2024 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2025 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2026 2027 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2028 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2029 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2030 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2031 __func__)); 2032 return key_senderror(so, m, EINVAL); 2033 } 2034 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2035 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2036 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2037 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2038 __func__)); 2039 return key_senderror(so, m, EINVAL); 2040 } 2041 2042 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 2043 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 2044 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2045 2046 /* make secindex */ 2047 /* XXX boundary check against sa_len */ 2048 KEY_SETSECSPIDX(xpl0->sadb_x_policy_dir, 2049 src0 + 1, 2050 dst0 + 1, 2051 src0->sadb_address_prefixlen, 2052 dst0->sadb_address_prefixlen, 2053 src0->sadb_address_proto, 2054 &spidx); 2055 2056 /* checking the direciton. */ 2057 switch (xpl0->sadb_x_policy_dir) { 2058 case IPSEC_DIR_INBOUND: 2059 case IPSEC_DIR_OUTBOUND: 2060 break; 2061 default: 2062 ipseclog((LOG_DEBUG, "%s: Invalid SP direction.\n", __func__)); 2063 return key_senderror(so, m, EINVAL); 2064 } 2065 2066 /* Is there SP in SPD ? */ 2067 if ((sp = key_getsp(&spidx)) == NULL) { 2068 ipseclog((LOG_DEBUG, "%s: no SP found.\n", __func__)); 2069 return key_senderror(so, m, EINVAL); 2070 } 2071 2072 /* save policy id to buffer to be returned. */ 2073 xpl0->sadb_x_policy_id = sp->id; 2074 2075 sp->state = IPSEC_SPSTATE_DEAD; 2076 KEY_FREESP(&sp); 2077 2078 { 2079 struct mbuf *n; 2080 struct sadb_msg *newmsg; 2081 2082 /* create new sadb_msg to reply. */ 2083 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2084 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2085 if (!n) 2086 return key_senderror(so, m, ENOBUFS); 2087 2088 newmsg = mtod(n, struct sadb_msg *); 2089 newmsg->sadb_msg_errno = 0; 2090 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2091 2092 m_freem(m); 2093 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2094 } 2095} 2096 2097/* 2098 * SADB_SPDDELETE2 processing 2099 * receive 2100 * <base, policy(*)> 2101 * from the user(?), and set SADB_SASTATE_DEAD, 2102 * and send, 2103 * <base, policy(*)> 2104 * to the ikmpd. 2105 * policy(*) including direction of policy. 2106 * 2107 * m will always be freed. 2108 */ 2109static int 2110key_spddelete2(so, m, mhp) 2111 struct socket *so; 2112 struct mbuf *m; 2113 const struct sadb_msghdr *mhp; 2114{ 2115 u_int32_t id; 2116 struct secpolicy *sp; 2117 2118 IPSEC_ASSERT(so != NULL, ("null socket")); 2119 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2120 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2121 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2122 2123 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2124 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2125 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", __func__)); 2126 key_senderror(so, m, EINVAL); 2127 return 0; 2128 } 2129 2130 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2131 2132 /* Is there SP in SPD ? */ 2133 if ((sp = key_getspbyid(id)) == NULL) { 2134 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2135 key_senderror(so, m, EINVAL); 2136 } 2137 2138 sp->state = IPSEC_SPSTATE_DEAD; 2139 KEY_FREESP(&sp); 2140 2141 { 2142 struct mbuf *n, *nn; 2143 struct sadb_msg *newmsg; 2144 int off, len; 2145 2146 /* create new sadb_msg to reply. */ 2147 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2148 2149 if (len > MCLBYTES) 2150 return key_senderror(so, m, ENOBUFS); 2151 MGETHDR(n, M_DONTWAIT, MT_DATA); 2152 if (n && len > MHLEN) { 2153 MCLGET(n, M_DONTWAIT); 2154 if ((n->m_flags & M_EXT) == 0) { 2155 m_freem(n); 2156 n = NULL; 2157 } 2158 } 2159 if (!n) 2160 return key_senderror(so, m, ENOBUFS); 2161 2162 n->m_len = len; 2163 n->m_next = NULL; 2164 off = 0; 2165 2166 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 2167 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2168 2169 IPSEC_ASSERT(off == len, ("length inconsistency (off %u len %u)", 2170 off, len)); 2171 2172 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2173 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2174 if (!n->m_next) { 2175 m_freem(n); 2176 return key_senderror(so, m, ENOBUFS); 2177 } 2178 2179 n->m_pkthdr.len = 0; 2180 for (nn = n; nn; nn = nn->m_next) 2181 n->m_pkthdr.len += nn->m_len; 2182 2183 newmsg = mtod(n, struct sadb_msg *); 2184 newmsg->sadb_msg_errno = 0; 2185 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 2186 2187 m_freem(m); 2188 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2189 } 2190} 2191 2192/* 2193 * SADB_X_GET processing 2194 * receive 2195 * <base, policy(*)> 2196 * from the user(?), 2197 * and send, 2198 * <base, address(SD), policy> 2199 * to the ikmpd. 2200 * policy(*) including direction of policy. 2201 * 2202 * m will always be freed. 2203 */ 2204static int 2205key_spdget(so, m, mhp) 2206 struct socket *so; 2207 struct mbuf *m; 2208 const struct sadb_msghdr *mhp; 2209{ 2210 u_int32_t id; 2211 struct secpolicy *sp; 2212 struct mbuf *n; 2213 2214 IPSEC_ASSERT(so != NULL, ("null socket")); 2215 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2216 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2217 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2218 2219 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2220 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2221 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2222 __func__)); 2223 return key_senderror(so, m, EINVAL); 2224 } 2225 2226 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2227 2228 /* Is there SP in SPD ? */ 2229 if ((sp = key_getspbyid(id)) == NULL) { 2230 ipseclog((LOG_DEBUG, "%s: no SP found id:%u.\n", __func__, id)); 2231 return key_senderror(so, m, ENOENT); 2232 } 2233 2234 n = key_setdumpsp(sp, SADB_X_SPDGET, 0, mhp->msg->sadb_msg_pid); 2235 if (n != NULL) { 2236 m_freem(m); 2237 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2238 } else 2239 return key_senderror(so, m, ENOBUFS); 2240} 2241 2242/* 2243 * SADB_X_SPDACQUIRE processing. 2244 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2245 * send 2246 * <base, policy(*)> 2247 * to KMD, and expect to receive 2248 * <base> with SADB_X_SPDACQUIRE if error occured, 2249 * or 2250 * <base, policy> 2251 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2252 * policy(*) is without policy requests. 2253 * 2254 * 0 : succeed 2255 * others: error number 2256 */ 2257int 2258key_spdacquire(sp) 2259 struct secpolicy *sp; 2260{ 2261 struct mbuf *result = NULL, *m; 2262 struct secspacq *newspacq; 2263 int error; 2264 2265 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2266 IPSEC_ASSERT(sp->req == NULL, ("policy exists")); 2267 IPSEC_ASSERT(sp->policy == IPSEC_POLICY_IPSEC, 2268 ("policy not IPSEC %u", sp->policy)); 2269 2270 /* Get an entry to check whether sent message or not. */ 2271 newspacq = key_getspacq(&sp->spidx); 2272 if (newspacq != NULL) { 2273 if (key_blockacq_count < newspacq->count) { 2274 /* reset counter and do send message. */ 2275 newspacq->count = 0; 2276 } else { 2277 /* increment counter and do nothing. */ 2278 newspacq->count++; 2279 return 0; 2280 } 2281 SPACQ_UNLOCK(); 2282 } else { 2283 /* make new entry for blocking to send SADB_ACQUIRE. */ 2284 newspacq = key_newspacq(&sp->spidx); 2285 if (newspacq == NULL) 2286 return ENOBUFS; 2287 } 2288 2289 /* create new sadb_msg to reply. */ 2290 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2291 if (!m) { 2292 error = ENOBUFS; 2293 goto fail; 2294 } 2295 result = m; 2296 2297 result->m_pkthdr.len = 0; 2298 for (m = result; m; m = m->m_next) 2299 result->m_pkthdr.len += m->m_len; 2300 2301 mtod(result, struct sadb_msg *)->sadb_msg_len = 2302 PFKEY_UNIT64(result->m_pkthdr.len); 2303 2304 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2305 2306fail: 2307 if (result) 2308 m_freem(result); 2309 return error; 2310} 2311 2312/* 2313 * SADB_SPDFLUSH processing 2314 * receive 2315 * <base> 2316 * from the user, and free all entries in secpctree. 2317 * and send, 2318 * <base> 2319 * to the user. 2320 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2321 * 2322 * m will always be freed. 2323 */ 2324static int 2325key_spdflush(so, m, mhp) 2326 struct socket *so; 2327 struct mbuf *m; 2328 const struct sadb_msghdr *mhp; 2329{ 2330 struct sadb_msg *newmsg; 2331 struct secpolicy *sp; 2332 u_int dir; 2333 2334 IPSEC_ASSERT(so != NULL, ("null socket")); 2335 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2336 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2337 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2338 2339 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2340 return key_senderror(so, m, EINVAL); 2341 2342 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2343 SPTREE_LOCK(); 2344 LIST_FOREACH(sp, &sptree[dir], chain) 2345 sp->state = IPSEC_SPSTATE_DEAD; 2346 SPTREE_UNLOCK(); 2347 } 2348 2349 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2350 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2351 return key_senderror(so, m, ENOBUFS); 2352 } 2353 2354 if (m->m_next) 2355 m_freem(m->m_next); 2356 m->m_next = NULL; 2357 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2358 newmsg = mtod(m, struct sadb_msg *); 2359 newmsg->sadb_msg_errno = 0; 2360 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2361 2362 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2363} 2364 2365/* 2366 * SADB_SPDDUMP processing 2367 * receive 2368 * <base> 2369 * from the user, and dump all SP leaves 2370 * and send, 2371 * <base> ..... 2372 * to the ikmpd. 2373 * 2374 * m will always be freed. 2375 */ 2376static int 2377key_spddump(so, m, mhp) 2378 struct socket *so; 2379 struct mbuf *m; 2380 const struct sadb_msghdr *mhp; 2381{ 2382 struct secpolicy *sp; 2383 int cnt; 2384 u_int dir; 2385 struct mbuf *n; 2386 2387 IPSEC_ASSERT(so != NULL, ("null socket")); 2388 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2389 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2390 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2391 2392 /* search SPD entry and get buffer size. */ 2393 cnt = 0; 2394 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2395 LIST_FOREACH(sp, &sptree[dir], chain) { 2396 cnt++; 2397 } 2398 } 2399 2400 if (cnt == 0) 2401 return key_senderror(so, m, ENOENT); 2402 2403 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2404 LIST_FOREACH(sp, &sptree[dir], chain) { 2405 --cnt; 2406 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, 2407 mhp->msg->sadb_msg_pid); 2408 2409 if (n) 2410 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2411 } 2412 } 2413 2414 m_freem(m); 2415 return 0; 2416} 2417 2418static struct mbuf * 2419key_setdumpsp(sp, type, seq, pid) 2420 struct secpolicy *sp; 2421 u_int8_t type; 2422 u_int32_t seq, pid; 2423{ 2424 struct mbuf *result = NULL, *m; 2425 2426 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, sp->refcnt); 2427 if (!m) 2428 goto fail; 2429 result = m; 2430 2431 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2432 &sp->spidx.src.sa, sp->spidx.prefs, 2433 sp->spidx.ul_proto); 2434 if (!m) 2435 goto fail; 2436 m_cat(result, m); 2437 2438 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2439 &sp->spidx.dst.sa, sp->spidx.prefd, 2440 sp->spidx.ul_proto); 2441 if (!m) 2442 goto fail; 2443 m_cat(result, m); 2444 2445 m = key_sp2msg(sp); 2446 if (!m) 2447 goto fail; 2448 m_cat(result, m); 2449 2450 if ((result->m_flags & M_PKTHDR) == 0) 2451 goto fail; 2452 2453 if (result->m_len < sizeof(struct sadb_msg)) { 2454 result = m_pullup(result, sizeof(struct sadb_msg)); 2455 if (result == NULL) 2456 goto fail; 2457 } 2458 2459 result->m_pkthdr.len = 0; 2460 for (m = result; m; m = m->m_next) 2461 result->m_pkthdr.len += m->m_len; 2462 2463 mtod(result, struct sadb_msg *)->sadb_msg_len = 2464 PFKEY_UNIT64(result->m_pkthdr.len); 2465 2466 return result; 2467 2468fail: 2469 m_freem(result); 2470 return NULL; 2471} 2472 2473/* 2474 * get PFKEY message length for security policy and request. 2475 */ 2476static u_int 2477key_getspreqmsglen(sp) 2478 struct secpolicy *sp; 2479{ 2480 u_int tlen; 2481 2482 tlen = sizeof(struct sadb_x_policy); 2483 2484 /* if is the policy for ipsec ? */ 2485 if (sp->policy != IPSEC_POLICY_IPSEC) 2486 return tlen; 2487 2488 /* get length of ipsec requests */ 2489 { 2490 struct ipsecrequest *isr; 2491 int len; 2492 2493 for (isr = sp->req; isr != NULL; isr = isr->next) { 2494 len = sizeof(struct sadb_x_ipsecrequest) 2495 + isr->saidx.src.sa.sa_len 2496 + isr->saidx.dst.sa.sa_len; 2497 2498 tlen += PFKEY_ALIGN8(len); 2499 } 2500 } 2501 2502 return tlen; 2503} 2504 2505/* 2506 * SADB_SPDEXPIRE processing 2507 * send 2508 * <base, address(SD), lifetime(CH), policy> 2509 * to KMD by PF_KEY. 2510 * 2511 * OUT: 0 : succeed 2512 * others : error number 2513 */ 2514static int 2515key_spdexpire(sp) 2516 struct secpolicy *sp; 2517{ 2518 struct mbuf *result = NULL, *m; 2519 int len; 2520 int error = -1; 2521 struct sadb_lifetime *lt; 2522 2523 /* XXX: Why do we lock ? */ 2524 2525 IPSEC_ASSERT(sp != NULL, ("null secpolicy")); 2526 2527 /* set msg header */ 2528 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2529 if (!m) { 2530 error = ENOBUFS; 2531 goto fail; 2532 } 2533 result = m; 2534 2535 /* create lifetime extension (current and hard) */ 2536 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2537 m = key_alloc_mbuf(len); 2538 if (!m || m->m_next) { /*XXX*/ 2539 if (m) 2540 m_freem(m); 2541 error = ENOBUFS; 2542 goto fail; 2543 } 2544 bzero(mtod(m, caddr_t), len); 2545 lt = mtod(m, struct sadb_lifetime *); 2546 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2547 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2548 lt->sadb_lifetime_allocations = 0; 2549 lt->sadb_lifetime_bytes = 0; 2550 lt->sadb_lifetime_addtime = sp->created; 2551 lt->sadb_lifetime_usetime = sp->lastused; 2552 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 2553 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2554 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2555 lt->sadb_lifetime_allocations = 0; 2556 lt->sadb_lifetime_bytes = 0; 2557 lt->sadb_lifetime_addtime = sp->lifetime; 2558 lt->sadb_lifetime_usetime = sp->validtime; 2559 m_cat(result, m); 2560 2561 /* set sadb_address for source */ 2562 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2563 &sp->spidx.src.sa, 2564 sp->spidx.prefs, sp->spidx.ul_proto); 2565 if (!m) { 2566 error = ENOBUFS; 2567 goto fail; 2568 } 2569 m_cat(result, m); 2570 2571 /* set sadb_address for destination */ 2572 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2573 &sp->spidx.dst.sa, 2574 sp->spidx.prefd, sp->spidx.ul_proto); 2575 if (!m) { 2576 error = ENOBUFS; 2577 goto fail; 2578 } 2579 m_cat(result, m); 2580 2581 /* set secpolicy */ 2582 m = key_sp2msg(sp); 2583 if (!m) { 2584 error = ENOBUFS; 2585 goto fail; 2586 } 2587 m_cat(result, m); 2588 2589 if ((result->m_flags & M_PKTHDR) == 0) { 2590 error = EINVAL; 2591 goto fail; 2592 } 2593 2594 if (result->m_len < sizeof(struct sadb_msg)) { 2595 result = m_pullup(result, sizeof(struct sadb_msg)); 2596 if (result == NULL) { 2597 error = ENOBUFS; 2598 goto fail; 2599 } 2600 } 2601 2602 result->m_pkthdr.len = 0; 2603 for (m = result; m; m = m->m_next) 2604 result->m_pkthdr.len += m->m_len; 2605 2606 mtod(result, struct sadb_msg *)->sadb_msg_len = 2607 PFKEY_UNIT64(result->m_pkthdr.len); 2608 2609 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2610 2611 fail: 2612 if (result) 2613 m_freem(result); 2614 return error; 2615} 2616 2617/* %%% SAD management */ 2618/* 2619 * allocating a memory for new SA head, and copy from the values of mhp. 2620 * OUT: NULL : failure due to the lack of memory. 2621 * others : pointer to new SA head. 2622 */ 2623static struct secashead * 2624key_newsah(saidx) 2625 struct secasindex *saidx; 2626{ 2627 struct secashead *newsah; 2628 2629 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 2630 2631 newsah = malloc(sizeof(struct secashead), M_IPSEC_SAH, M_NOWAIT|M_ZERO); 2632 if (newsah != NULL) { 2633 int i; 2634 for (i = 0; i < sizeof(newsah->savtree)/sizeof(newsah->savtree[0]); i++) 2635 LIST_INIT(&newsah->savtree[i]); 2636 newsah->saidx = *saidx; 2637 2638 /* add to saidxtree */ 2639 newsah->state = SADB_SASTATE_MATURE; 2640 2641 SAHTREE_LOCK(); 2642 LIST_INSERT_HEAD(&sahtree, newsah, chain); 2643 SAHTREE_UNLOCK(); 2644 } 2645 return(newsah); 2646} 2647 2648/* 2649 * delete SA index and all SA registerd. 2650 */ 2651static void 2652key_delsah(sah) 2653 struct secashead *sah; 2654{ 2655 struct secasvar *sav, *nextsav; 2656 u_int stateidx; 2657 int zombie = 0; 2658 2659 IPSEC_ASSERT(sah != NULL, ("NULL sah")); 2660 SAHTREE_LOCK_ASSERT(); 2661 2662 /* searching all SA registerd in the secindex. */ 2663 for (stateidx = 0; 2664 stateidx < _ARRAYLEN(saorder_state_any); 2665 stateidx++) { 2666 u_int state = saorder_state_any[stateidx]; 2667 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, nextsav) { 2668 if (sav->refcnt == 0) { 2669 /* sanity check */ 2670 KEY_CHKSASTATE(state, sav->state, __func__); 2671 KEY_FREESAV(&sav); 2672 } else { 2673 /* give up to delete this sa */ 2674 zombie++; 2675 } 2676 } 2677 } 2678 if (!zombie) { /* delete only if there are savs */ 2679 /* remove from tree of SA index */ 2680 if (__LIST_CHAINED(sah)) 2681 LIST_REMOVE(sah, chain); 2682 if (sah->sa_route.ro_rt) { 2683 RTFREE(sah->sa_route.ro_rt); 2684 sah->sa_route.ro_rt = (struct rtentry *)NULL; 2685 } 2686 free(sah, M_IPSEC_SAH); 2687 } 2688} 2689 2690/* 2691 * allocating a new SA with LARVAL state. key_add() and key_getspi() call, 2692 * and copy the values of mhp into new buffer. 2693 * When SAD message type is GETSPI: 2694 * to set sequence number from acq_seq++, 2695 * to set zero to SPI. 2696 * not to call key_setsava(). 2697 * OUT: NULL : fail 2698 * others : pointer to new secasvar. 2699 * 2700 * does not modify mbuf. does not free mbuf on error. 2701 */ 2702static struct secasvar * 2703key_newsav(m, mhp, sah, errp, where, tag) 2704 struct mbuf *m; 2705 const struct sadb_msghdr *mhp; 2706 struct secashead *sah; 2707 int *errp; 2708 const char* where; 2709 int tag; 2710{ 2711 struct secasvar *newsav; 2712 const struct sadb_sa *xsa; 2713 2714 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2715 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2716 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2717 IPSEC_ASSERT(sah != NULL, ("null secashead")); 2718 2719 newsav = malloc(sizeof(struct secasvar), M_IPSEC_SA, M_NOWAIT|M_ZERO); 2720 if (newsav == NULL) { 2721 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 2722 *errp = ENOBUFS; 2723 goto done; 2724 } 2725 2726 switch (mhp->msg->sadb_msg_type) { 2727 case SADB_GETSPI: 2728 newsav->spi = 0; 2729 2730#ifdef IPSEC_DOSEQCHECK 2731 /* sync sequence number */ 2732 if (mhp->msg->sadb_msg_seq == 0) 2733 newsav->seq = 2734 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 2735 else 2736#endif 2737 newsav->seq = mhp->msg->sadb_msg_seq; 2738 break; 2739 2740 case SADB_ADD: 2741 /* sanity check */ 2742 if (mhp->ext[SADB_EXT_SA] == NULL) { 2743 free(newsav, M_IPSEC_SA); 2744 newsav = NULL; 2745 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 2746 __func__)); 2747 *errp = EINVAL; 2748 goto done; 2749 } 2750 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2751 newsav->spi = xsa->sadb_sa_spi; 2752 newsav->seq = mhp->msg->sadb_msg_seq; 2753 break; 2754 default: 2755 free(newsav, M_IPSEC_SA); 2756 newsav = NULL; 2757 *errp = EINVAL; 2758 goto done; 2759 } 2760 2761 2762 /* copy sav values */ 2763 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2764 *errp = key_setsaval(newsav, m, mhp); 2765 if (*errp) { 2766 free(newsav, M_IPSEC_SA); 2767 newsav = NULL; 2768 goto done; 2769 } 2770 } 2771 2772 SECASVAR_LOCK_INIT(newsav); 2773 2774 /* reset created */ 2775 newsav->created = time_second; 2776 newsav->pid = mhp->msg->sadb_msg_pid; 2777 2778 /* add to satree */ 2779 newsav->sah = sah; 2780 sa_initref(newsav); 2781 newsav->state = SADB_SASTATE_LARVAL; 2782 2783 /* XXX locking??? */ 2784 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_LARVAL], newsav, 2785 secasvar, chain); 2786done: 2787 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 2788 printf("DP %s from %s:%u return SP:%p\n", __func__, 2789 where, tag, newsav)); 2790 2791 return newsav; 2792} 2793 2794/* 2795 * free() SA variable entry. 2796 */ 2797static void 2798key_cleansav(struct secasvar *sav) 2799{ 2800 /* 2801 * Cleanup xform state. Note that zeroize'ing causes the 2802 * keys to be cleared; otherwise we must do it ourself. 2803 */ 2804 if (sav->tdb_xform != NULL) { 2805 sav->tdb_xform->xf_zeroize(sav); 2806 sav->tdb_xform = NULL; 2807 } else { 2808 KASSERT(sav->iv == NULL, ("iv but no xform")); 2809 if (sav->key_auth != NULL) 2810 bzero(sav->key_auth->key_data, _KEYLEN(sav->key_auth)); 2811 if (sav->key_enc != NULL) 2812 bzero(sav->key_enc->key_data, _KEYLEN(sav->key_enc)); 2813 } 2814 if (sav->key_auth != NULL) { 2815 if (sav->key_auth->key_data != NULL) 2816 free(sav->key_auth->key_data, M_IPSEC_MISC); 2817 free(sav->key_auth, M_IPSEC_MISC); 2818 sav->key_auth = NULL; 2819 } 2820 if (sav->key_enc != NULL) { 2821 if (sav->key_enc->key_data != NULL) 2822 free(sav->key_enc->key_data, M_IPSEC_MISC); 2823 free(sav->key_enc, M_IPSEC_MISC); 2824 sav->key_enc = NULL; 2825 } 2826 if (sav->sched) { 2827 bzero(sav->sched, sav->schedlen); 2828 free(sav->sched, M_IPSEC_MISC); 2829 sav->sched = NULL; 2830 } 2831 if (sav->replay != NULL) { 2832 free(sav->replay, M_IPSEC_MISC); 2833 sav->replay = NULL; 2834 } 2835 if (sav->lft_c != NULL) { 2836 free(sav->lft_c, M_IPSEC_MISC); 2837 sav->lft_c = NULL; 2838 } 2839 if (sav->lft_h != NULL) { 2840 free(sav->lft_h, M_IPSEC_MISC); 2841 sav->lft_h = NULL; 2842 } 2843 if (sav->lft_s != NULL) { 2844 free(sav->lft_s, M_IPSEC_MISC); 2845 sav->lft_s = NULL; 2846 } 2847} 2848 2849/* 2850 * free() SA variable entry. 2851 */ 2852static void 2853key_delsav(sav) 2854 struct secasvar *sav; 2855{ 2856 IPSEC_ASSERT(sav != NULL, ("null sav")); 2857 IPSEC_ASSERT(sav->refcnt == 0, ("reference count %u > 0", sav->refcnt)); 2858 2859 /* remove from SA header */ 2860 if (__LIST_CHAINED(sav)) 2861 LIST_REMOVE(sav, chain); 2862 key_cleansav(sav); 2863 SECASVAR_LOCK_DESTROY(sav); 2864 free(sav, M_IPSEC_SA); 2865} 2866 2867/* 2868 * search SAD. 2869 * OUT: 2870 * NULL : not found 2871 * others : found, pointer to a SA. 2872 */ 2873static struct secashead * 2874key_getsah(saidx) 2875 struct secasindex *saidx; 2876{ 2877 struct secashead *sah; 2878 2879 SAHTREE_LOCK(); 2880 LIST_FOREACH(sah, &sahtree, chain) { 2881 if (sah->state == SADB_SASTATE_DEAD) 2882 continue; 2883 if (key_cmpsaidx(&sah->saidx, saidx, CMP_REQID)) 2884 break; 2885 } 2886 SAHTREE_UNLOCK(); 2887 2888 return sah; 2889} 2890 2891/* 2892 * check not to be duplicated SPI. 2893 * NOTE: this function is too slow due to searching all SAD. 2894 * OUT: 2895 * NULL : not found 2896 * others : found, pointer to a SA. 2897 */ 2898static struct secasvar * 2899key_checkspidup(saidx, spi) 2900 struct secasindex *saidx; 2901 u_int32_t spi; 2902{ 2903 struct secashead *sah; 2904 struct secasvar *sav; 2905 2906 /* check address family */ 2907 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2908 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 2909 __func__)); 2910 return NULL; 2911 } 2912 2913 sav = NULL; 2914 /* check all SAD */ 2915 SAHTREE_LOCK(); 2916 LIST_FOREACH(sah, &sahtree, chain) { 2917 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2918 continue; 2919 sav = key_getsavbyspi(sah, spi); 2920 if (sav != NULL) 2921 break; 2922 } 2923 SAHTREE_UNLOCK(); 2924 2925 return sav; 2926} 2927 2928/* 2929 * search SAD litmited alive SA, protocol, SPI. 2930 * OUT: 2931 * NULL : not found 2932 * others : found, pointer to a SA. 2933 */ 2934static struct secasvar * 2935key_getsavbyspi(sah, spi) 2936 struct secashead *sah; 2937 u_int32_t spi; 2938{ 2939 struct secasvar *sav; 2940 u_int stateidx, state; 2941 2942 sav = NULL; 2943 SAHTREE_LOCK_ASSERT(); 2944 /* search all status */ 2945 for (stateidx = 0; 2946 stateidx < _ARRAYLEN(saorder_state_alive); 2947 stateidx++) { 2948 2949 state = saorder_state_alive[stateidx]; 2950 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2951 2952 /* sanity check */ 2953 if (sav->state != state) { 2954 ipseclog((LOG_DEBUG, "%s: " 2955 "invalid sav->state (queue: %d SA: %d)\n", 2956 __func__, state, sav->state)); 2957 continue; 2958 } 2959 2960 if (sav->spi == spi) 2961 return sav; 2962 } 2963 } 2964 2965 return NULL; 2966} 2967 2968/* 2969 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 2970 * You must update these if need. 2971 * OUT: 0: success. 2972 * !0: failure. 2973 * 2974 * does not modify mbuf. does not free mbuf on error. 2975 */ 2976static int 2977key_setsaval(sav, m, mhp) 2978 struct secasvar *sav; 2979 struct mbuf *m; 2980 const struct sadb_msghdr *mhp; 2981{ 2982 int error = 0; 2983 2984 IPSEC_ASSERT(m != NULL, ("null mbuf")); 2985 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 2986 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 2987 2988 /* initialization */ 2989 sav->replay = NULL; 2990 sav->key_auth = NULL; 2991 sav->key_enc = NULL; 2992 sav->sched = NULL; 2993 sav->schedlen = 0; 2994 sav->iv = NULL; 2995 sav->lft_c = NULL; 2996 sav->lft_h = NULL; 2997 sav->lft_s = NULL; 2998 sav->tdb_xform = NULL; /* transform */ 2999 sav->tdb_encalgxform = NULL; /* encoding algorithm */ 3000 sav->tdb_authalgxform = NULL; /* authentication algorithm */ 3001 sav->tdb_compalgxform = NULL; /* compression algorithm */ 3002 3003 /* SA */ 3004 if (mhp->ext[SADB_EXT_SA] != NULL) { 3005 const struct sadb_sa *sa0; 3006 3007 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3008 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3009 error = EINVAL; 3010 goto fail; 3011 } 3012 3013 sav->alg_auth = sa0->sadb_sa_auth; 3014 sav->alg_enc = sa0->sadb_sa_encrypt; 3015 sav->flags = sa0->sadb_sa_flags; 3016 3017 /* replay window */ 3018 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3019 sav->replay = (struct secreplay *) 3020 malloc(sizeof(struct secreplay)+sa0->sadb_sa_replay, M_IPSEC_MISC, M_NOWAIT|M_ZERO); 3021 if (sav->replay == NULL) { 3022 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3023 __func__)); 3024 error = ENOBUFS; 3025 goto fail; 3026 } 3027 if (sa0->sadb_sa_replay != 0) 3028 sav->replay->bitmap = (caddr_t)(sav->replay+1); 3029 sav->replay->wsize = sa0->sadb_sa_replay; 3030 } 3031 } 3032 3033 /* Authentication keys */ 3034 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3035 const struct sadb_key *key0; 3036 int len; 3037 3038 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3039 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3040 3041 error = 0; 3042 if (len < sizeof(*key0)) { 3043 error = EINVAL; 3044 goto fail; 3045 } 3046 switch (mhp->msg->sadb_msg_satype) { 3047 case SADB_SATYPE_AH: 3048 case SADB_SATYPE_ESP: 3049 case SADB_X_SATYPE_TCPSIGNATURE: 3050 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3051 sav->alg_auth != SADB_X_AALG_NULL) 3052 error = EINVAL; 3053 break; 3054 case SADB_X_SATYPE_IPCOMP: 3055 default: 3056 error = EINVAL; 3057 break; 3058 } 3059 if (error) { 3060 ipseclog((LOG_DEBUG, "%s: invalid key_auth values.\n", 3061 __func__)); 3062 goto fail; 3063 } 3064 3065 sav->key_auth = (struct seckey *)key_dup_keymsg(key0, len, 3066 M_IPSEC_MISC); 3067 if (sav->key_auth == NULL ) { 3068 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3069 __func__)); 3070 error = ENOBUFS; 3071 goto fail; 3072 } 3073 } 3074 3075 /* Encryption key */ 3076 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3077 const struct sadb_key *key0; 3078 int len; 3079 3080 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3081 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3082 3083 error = 0; 3084 if (len < sizeof(*key0)) { 3085 error = EINVAL; 3086 goto fail; 3087 } 3088 switch (mhp->msg->sadb_msg_satype) { 3089 case SADB_SATYPE_ESP: 3090 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3091 sav->alg_enc != SADB_EALG_NULL) { 3092 error = EINVAL; 3093 break; 3094 } 3095 sav->key_enc = (struct seckey *)key_dup_keymsg(key0, 3096 len, 3097 M_IPSEC_MISC); 3098 if (sav->key_enc == NULL) { 3099 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3100 __func__)); 3101 error = ENOBUFS; 3102 goto fail; 3103 } 3104 break; 3105 case SADB_X_SATYPE_IPCOMP: 3106 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3107 error = EINVAL; 3108 sav->key_enc = NULL; /*just in case*/ 3109 break; 3110 case SADB_SATYPE_AH: 3111 case SADB_X_SATYPE_TCPSIGNATURE: 3112 default: 3113 error = EINVAL; 3114 break; 3115 } 3116 if (error) { 3117 ipseclog((LOG_DEBUG, "%s: invalid key_enc value.\n", 3118 __func__)); 3119 goto fail; 3120 } 3121 } 3122 3123 /* set iv */ 3124 sav->ivlen = 0; 3125 3126 switch (mhp->msg->sadb_msg_satype) { 3127 case SADB_SATYPE_AH: 3128 error = xform_init(sav, XF_AH); 3129 break; 3130 case SADB_SATYPE_ESP: 3131 error = xform_init(sav, XF_ESP); 3132 break; 3133 case SADB_X_SATYPE_IPCOMP: 3134 error = xform_init(sav, XF_IPCOMP); 3135 break; 3136 case SADB_X_SATYPE_TCPSIGNATURE: 3137 error = xform_init(sav, XF_TCPSIGNATURE); 3138 break; 3139 } 3140 if (error) { 3141 ipseclog((LOG_DEBUG, "%s: unable to initialize SA type %u.\n", 3142 __func__, mhp->msg->sadb_msg_satype)); 3143 goto fail; 3144 } 3145 3146 /* reset created */ 3147 sav->created = time_second; 3148 3149 /* make lifetime for CURRENT */ 3150 sav->lft_c = malloc(sizeof(struct sadb_lifetime), M_IPSEC_MISC, M_NOWAIT); 3151 if (sav->lft_c == NULL) { 3152 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3153 error = ENOBUFS; 3154 goto fail; 3155 } 3156 3157 sav->lft_c->allocations = 0; 3158 sav->lft_c->bytes = 0; 3159 sav->lft_c->addtime = time_second; 3160 sav->lft_c->usetime = 0; 3161 3162 /* lifetimes for HARD and SOFT */ 3163 { 3164 const struct sadb_lifetime *lft0; 3165 3166 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3167 if (lft0 != NULL) { 3168 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3169 error = EINVAL; 3170 goto fail; 3171 } 3172 sav->lft_h = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3173 if (sav->lft_h == NULL) { 3174 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3175 error = ENOBUFS; 3176 goto fail; 3177 } 3178 /* to be initialize ? */ 3179 } 3180 3181 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3182 if (lft0 != NULL) { 3183 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3184 error = EINVAL; 3185 goto fail; 3186 } 3187 sav->lft_s = key_dup_lifemsg(lft0, M_IPSEC_MISC); 3188 if (sav->lft_s == NULL) { 3189 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 3190 error = ENOBUFS; 3191 goto fail; 3192 } 3193 /* to be initialize ? */ 3194 } 3195 } 3196 3197 return 0; 3198 3199 fail: 3200 /* initialization */ 3201 key_cleansav(sav); 3202 3203 return error; 3204} 3205 3206/* 3207 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3208 * OUT: 0: valid 3209 * other: errno 3210 */ 3211static int 3212key_mature(struct secasvar *sav) 3213{ 3214 int error; 3215 3216 /* check SPI value */ 3217 switch (sav->sah->saidx.proto) { 3218 case IPPROTO_ESP: 3219 case IPPROTO_AH: 3220 if (ntohl(sav->spi) >= 0 && ntohl(sav->spi) <= 255) { 3221 ipseclog((LOG_DEBUG, "%s: illegal range of SPI %u.\n", 3222 __func__, (u_int32_t)ntohl(sav->spi))); 3223 return EINVAL; 3224 } 3225 break; 3226 } 3227 3228 /* check satype */ 3229 switch (sav->sah->saidx.proto) { 3230 case IPPROTO_ESP: 3231 /* check flags */ 3232 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3233 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3234 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3235 "given to old-esp.\n", __func__)); 3236 return EINVAL; 3237 } 3238 error = xform_init(sav, XF_ESP); 3239 break; 3240 case IPPROTO_AH: 3241 /* check flags */ 3242 if (sav->flags & SADB_X_EXT_DERIV) { 3243 ipseclog((LOG_DEBUG, "%s: invalid flag (derived) " 3244 "given to AH SA.\n", __func__)); 3245 return EINVAL; 3246 } 3247 if (sav->alg_enc != SADB_EALG_NONE) { 3248 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3249 "mismated.\n", __func__)); 3250 return(EINVAL); 3251 } 3252 error = xform_init(sav, XF_AH); 3253 break; 3254 case IPPROTO_IPCOMP: 3255 if (sav->alg_auth != SADB_AALG_NONE) { 3256 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3257 "mismated.\n", __func__)); 3258 return(EINVAL); 3259 } 3260 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3261 && ntohl(sav->spi) >= 0x10000) { 3262 ipseclog((LOG_DEBUG, "%s: invalid cpi for IPComp.\n", 3263 __func__)); 3264 return(EINVAL); 3265 } 3266 error = xform_init(sav, XF_IPCOMP); 3267 break; 3268 case IPPROTO_TCP: 3269 if (sav->alg_enc != SADB_EALG_NONE) { 3270 ipseclog((LOG_DEBUG, "%s: protocol and algorithm " 3271 "mismated.\n", __func__)); 3272 return(EINVAL); 3273 } 3274 error = xform_init(sav, XF_TCPSIGNATURE); 3275 break; 3276 default: 3277 ipseclog((LOG_DEBUG, "%s: Invalid satype.\n", __func__)); 3278 error = EPROTONOSUPPORT; 3279 break; 3280 } 3281 if (error == 0) { 3282 SAHTREE_LOCK(); 3283 key_sa_chgstate(sav, SADB_SASTATE_MATURE); 3284 SAHTREE_UNLOCK(); 3285 } 3286 return (error); 3287} 3288 3289/* 3290 * subroutine for SADB_GET and SADB_DUMP. 3291 */ 3292static struct mbuf * 3293key_setdumpsa(sav, type, satype, seq, pid) 3294 struct secasvar *sav; 3295 u_int8_t type, satype; 3296 u_int32_t seq, pid; 3297{ 3298 struct mbuf *result = NULL, *tres = NULL, *m; 3299 int i; 3300 int dumporder[] = { 3301 SADB_EXT_SA, SADB_X_EXT_SA2, 3302 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3303 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3304 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3305 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3306 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3307 }; 3308 3309 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3310 if (m == NULL) 3311 goto fail; 3312 result = m; 3313 3314 for (i = sizeof(dumporder)/sizeof(dumporder[0]) - 1; i >= 0; i--) { 3315 m = NULL; 3316 switch (dumporder[i]) { 3317 case SADB_EXT_SA: 3318 m = key_setsadbsa(sav); 3319 if (!m) 3320 goto fail; 3321 break; 3322 3323 case SADB_X_EXT_SA2: 3324 m = key_setsadbxsa2(sav->sah->saidx.mode, 3325 sav->replay ? sav->replay->count : 0, 3326 sav->sah->saidx.reqid); 3327 if (!m) 3328 goto fail; 3329 break; 3330 3331 case SADB_EXT_ADDRESS_SRC: 3332 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3333 &sav->sah->saidx.src.sa, 3334 FULLMASK, IPSEC_ULPROTO_ANY); 3335 if (!m) 3336 goto fail; 3337 break; 3338 3339 case SADB_EXT_ADDRESS_DST: 3340 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3341 &sav->sah->saidx.dst.sa, 3342 FULLMASK, IPSEC_ULPROTO_ANY); 3343 if (!m) 3344 goto fail; 3345 break; 3346 3347 case SADB_EXT_KEY_AUTH: 3348 if (!sav->key_auth) 3349 continue; 3350 m = key_setkey(sav->key_auth, SADB_EXT_KEY_AUTH); 3351 if (!m) 3352 goto fail; 3353 break; 3354 3355 case SADB_EXT_KEY_ENCRYPT: 3356 if (!sav->key_enc) 3357 continue; 3358 m = key_setkey(sav->key_enc, SADB_EXT_KEY_ENCRYPT); 3359 if (!m) 3360 goto fail; 3361 break; 3362 3363 case SADB_EXT_LIFETIME_CURRENT: 3364 if (!sav->lft_c) 3365 continue; 3366 m = key_setlifetime(sav->lft_c, 3367 SADB_EXT_LIFETIME_CURRENT); 3368 if (!m) 3369 goto fail; 3370 break; 3371 3372 case SADB_EXT_LIFETIME_HARD: 3373 if (!sav->lft_h) 3374 continue; 3375 m = key_setlifetime(sav->lft_h, 3376 SADB_EXT_LIFETIME_HARD); 3377 if (!m) 3378 goto fail; 3379 break; 3380 3381 case SADB_EXT_LIFETIME_SOFT: 3382 if (!sav->lft_s) 3383 continue; 3384 m = key_setlifetime(sav->lft_h, 3385 SADB_EXT_LIFETIME_SOFT); 3386 3387 if (!m) 3388 goto fail; 3389 break; 3390 3391 case SADB_EXT_ADDRESS_PROXY: 3392 case SADB_EXT_IDENTITY_SRC: 3393 case SADB_EXT_IDENTITY_DST: 3394 /* XXX: should we brought from SPD ? */ 3395 case SADB_EXT_SENSITIVITY: 3396 default: 3397 continue; 3398 } 3399 3400 if (!m) 3401 goto fail; 3402 if (tres) 3403 m_cat(m, tres); 3404 tres = m; 3405 3406 } 3407 3408 m_cat(result, tres); 3409 if (result->m_len < sizeof(struct sadb_msg)) { 3410 result = m_pullup(result, sizeof(struct sadb_msg)); 3411 if (result == NULL) 3412 goto fail; 3413 } 3414 3415 result->m_pkthdr.len = 0; 3416 for (m = result; m; m = m->m_next) 3417 result->m_pkthdr.len += m->m_len; 3418 3419 mtod(result, struct sadb_msg *)->sadb_msg_len = 3420 PFKEY_UNIT64(result->m_pkthdr.len); 3421 3422 return result; 3423 3424fail: 3425 m_freem(result); 3426 m_freem(tres); 3427 return NULL; 3428} 3429 3430/* 3431 * set data into sadb_msg. 3432 */ 3433static struct mbuf * 3434key_setsadbmsg(type, tlen, satype, seq, pid, reserved) 3435 u_int8_t type, satype; 3436 u_int16_t tlen; 3437 u_int32_t seq; 3438 pid_t pid; 3439 u_int16_t reserved; 3440{ 3441 struct mbuf *m; 3442 struct sadb_msg *p; 3443 int len; 3444 3445 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3446 if (len > MCLBYTES) 3447 return NULL; 3448 MGETHDR(m, M_DONTWAIT, MT_DATA); 3449 if (m && len > MHLEN) { 3450 MCLGET(m, M_DONTWAIT); 3451 if ((m->m_flags & M_EXT) == 0) { 3452 m_freem(m); 3453 m = NULL; 3454 } 3455 } 3456 if (!m) 3457 return NULL; 3458 m->m_pkthdr.len = m->m_len = len; 3459 m->m_next = NULL; 3460 3461 p = mtod(m, struct sadb_msg *); 3462 3463 bzero(p, len); 3464 p->sadb_msg_version = PF_KEY_V2; 3465 p->sadb_msg_type = type; 3466 p->sadb_msg_errno = 0; 3467 p->sadb_msg_satype = satype; 3468 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3469 p->sadb_msg_reserved = reserved; 3470 p->sadb_msg_seq = seq; 3471 p->sadb_msg_pid = (u_int32_t)pid; 3472 3473 return m; 3474} 3475 3476/* 3477 * copy secasvar data into sadb_address. 3478 */ 3479static struct mbuf * 3480key_setsadbsa(sav) 3481 struct secasvar *sav; 3482{ 3483 struct mbuf *m; 3484 struct sadb_sa *p; 3485 int len; 3486 3487 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3488 m = key_alloc_mbuf(len); 3489 if (!m || m->m_next) { /*XXX*/ 3490 if (m) 3491 m_freem(m); 3492 return NULL; 3493 } 3494 3495 p = mtod(m, struct sadb_sa *); 3496 3497 bzero(p, len); 3498 p->sadb_sa_len = PFKEY_UNIT64(len); 3499 p->sadb_sa_exttype = SADB_EXT_SA; 3500 p->sadb_sa_spi = sav->spi; 3501 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3502 p->sadb_sa_state = sav->state; 3503 p->sadb_sa_auth = sav->alg_auth; 3504 p->sadb_sa_encrypt = sav->alg_enc; 3505 p->sadb_sa_flags = sav->flags; 3506 3507 return m; 3508} 3509 3510/* 3511 * set data into sadb_address. 3512 */ 3513static struct mbuf * 3514key_setsadbaddr(exttype, saddr, prefixlen, ul_proto) 3515 u_int16_t exttype; 3516 const struct sockaddr *saddr; 3517 u_int8_t prefixlen; 3518 u_int16_t ul_proto; 3519{ 3520 struct mbuf *m; 3521 struct sadb_address *p; 3522 size_t len; 3523 3524 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3525 PFKEY_ALIGN8(saddr->sa_len); 3526 m = key_alloc_mbuf(len); 3527 if (!m || m->m_next) { /*XXX*/ 3528 if (m) 3529 m_freem(m); 3530 return NULL; 3531 } 3532 3533 p = mtod(m, struct sadb_address *); 3534 3535 bzero(p, len); 3536 p->sadb_address_len = PFKEY_UNIT64(len); 3537 p->sadb_address_exttype = exttype; 3538 p->sadb_address_proto = ul_proto; 3539 if (prefixlen == FULLMASK) { 3540 switch (saddr->sa_family) { 3541 case AF_INET: 3542 prefixlen = sizeof(struct in_addr) << 3; 3543 break; 3544 case AF_INET6: 3545 prefixlen = sizeof(struct in6_addr) << 3; 3546 break; 3547 default: 3548 ; /*XXX*/ 3549 } 3550 } 3551 p->sadb_address_prefixlen = prefixlen; 3552 p->sadb_address_reserved = 0; 3553 3554 bcopy(saddr, 3555 mtod(m, caddr_t) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3556 saddr->sa_len); 3557 3558 return m; 3559} 3560 3561/* 3562 * set data into sadb_x_sa2. 3563 */ 3564static struct mbuf * 3565key_setsadbxsa2(mode, seq, reqid) 3566 u_int8_t mode; 3567 u_int32_t seq, reqid; 3568{ 3569 struct mbuf *m; 3570 struct sadb_x_sa2 *p; 3571 size_t len; 3572 3573 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3574 m = key_alloc_mbuf(len); 3575 if (!m || m->m_next) { /*XXX*/ 3576 if (m) 3577 m_freem(m); 3578 return NULL; 3579 } 3580 3581 p = mtod(m, struct sadb_x_sa2 *); 3582 3583 bzero(p, len); 3584 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3585 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3586 p->sadb_x_sa2_mode = mode; 3587 p->sadb_x_sa2_reserved1 = 0; 3588 p->sadb_x_sa2_reserved2 = 0; 3589 p->sadb_x_sa2_sequence = seq; 3590 p->sadb_x_sa2_reqid = reqid; 3591 3592 return m; 3593} 3594 3595/* 3596 * set data into sadb_x_policy 3597 */ 3598static struct mbuf * 3599key_setsadbxpolicy(type, dir, id) 3600 u_int16_t type; 3601 u_int8_t dir; 3602 u_int32_t id; 3603{ 3604 struct mbuf *m; 3605 struct sadb_x_policy *p; 3606 size_t len; 3607 3608 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3609 m = key_alloc_mbuf(len); 3610 if (!m || m->m_next) { /*XXX*/ 3611 if (m) 3612 m_freem(m); 3613 return NULL; 3614 } 3615 3616 p = mtod(m, struct sadb_x_policy *); 3617 3618 bzero(p, len); 3619 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3620 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3621 p->sadb_x_policy_type = type; 3622 p->sadb_x_policy_dir = dir; 3623 p->sadb_x_policy_id = id; 3624 3625 return m; 3626} 3627 3628/* %%% utilities */ 3629/* Take a key message (sadb_key) from the socket and turn it into one 3630 * of the kernel's key structures (seckey). 3631 * 3632 * IN: pointer to the src 3633 * OUT: NULL no more memory 3634 */ 3635struct seckey * 3636key_dup_keymsg(const struct sadb_key *src, u_int len, 3637 struct malloc_type *type) 3638{ 3639 struct seckey *dst; 3640 dst = (struct seckey *)malloc(sizeof(struct seckey), type, M_NOWAIT); 3641 if (dst != NULL) { 3642 dst->bits = src->sadb_key_bits; 3643 dst->key_data = (char *)malloc(len, type, M_NOWAIT); 3644 if (dst->key_data != NULL) { 3645 bcopy((const char *)src + sizeof(struct sadb_key), 3646 dst->key_data, len); 3647 } else { 3648 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3649 __func__)); 3650 free(dst, type); 3651 dst = NULL; 3652 } 3653 } else { 3654 ipseclog((LOG_DEBUG, "%s: No more memory.\n", 3655 __func__)); 3656 3657 } 3658 return dst; 3659} 3660 3661/* Take a lifetime message (sadb_lifetime) passed in on a socket and 3662 * turn it into one of the kernel's lifetime structures (seclifetime). 3663 * 3664 * IN: pointer to the destination, source and malloc type 3665 * OUT: NULL, no more memory 3666 */ 3667 3668static struct seclifetime * 3669key_dup_lifemsg(const struct sadb_lifetime *src, 3670 struct malloc_type *type) 3671{ 3672 struct seclifetime *dst = NULL; 3673 3674 dst = (struct seclifetime *)malloc(sizeof(struct seclifetime), 3675 type, M_NOWAIT); 3676 if (dst == NULL) { 3677 /* XXX counter */ 3678 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 3679 } else { 3680 dst->allocations = src->sadb_lifetime_allocations; 3681 dst->bytes = src->sadb_lifetime_bytes; 3682 dst->addtime = src->sadb_lifetime_addtime; 3683 dst->usetime = src->sadb_lifetime_usetime; 3684 } 3685 return dst; 3686} 3687 3688/* compare my own address 3689 * OUT: 1: true, i.e. my address. 3690 * 0: false 3691 */ 3692int 3693key_ismyaddr(sa) 3694 struct sockaddr *sa; 3695{ 3696#ifdef INET 3697 struct sockaddr_in *sin; 3698 struct in_ifaddr *ia; 3699#endif 3700 3701 IPSEC_ASSERT(sa != NULL, ("null sockaddr")); 3702 3703 switch (sa->sa_family) { 3704#ifdef INET 3705 case AF_INET: 3706 sin = (struct sockaddr_in *)sa; 3707 for (ia = in_ifaddrhead.tqh_first; ia; 3708 ia = ia->ia_link.tqe_next) 3709 { 3710 if (sin->sin_family == ia->ia_addr.sin_family && 3711 sin->sin_len == ia->ia_addr.sin_len && 3712 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3713 { 3714 return 1; 3715 } 3716 } 3717 break; 3718#endif 3719#ifdef INET6 3720 case AF_INET6: 3721 return key_ismyaddr6((struct sockaddr_in6 *)sa); 3722#endif 3723 } 3724 3725 return 0; 3726} 3727 3728#ifdef INET6 3729/* 3730 * compare my own address for IPv6. 3731 * 1: ours 3732 * 0: other 3733 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3734 */ 3735#include <netinet6/in6_var.h> 3736 3737static int 3738key_ismyaddr6(sin6) 3739 struct sockaddr_in6 *sin6; 3740{ 3741 struct in6_ifaddr *ia; 3742 struct in6_multi *in6m; 3743 3744 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 3745 if (key_sockaddrcmp((struct sockaddr *)&sin6, 3746 (struct sockaddr *)&ia->ia_addr, 0) == 0) 3747 return 1; 3748 3749 /* 3750 * XXX Multicast 3751 * XXX why do we care about multlicast here while we don't care 3752 * about IPv4 multicast?? 3753 * XXX scope 3754 */ 3755 in6m = NULL; 3756 IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m); 3757 if (in6m) 3758 return 1; 3759 } 3760 3761 /* loopback, just for safety */ 3762 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3763 return 1; 3764 3765 return 0; 3766} 3767#endif /*INET6*/ 3768 3769/* 3770 * compare two secasindex structure. 3771 * flag can specify to compare 2 saidxes. 3772 * compare two secasindex structure without both mode and reqid. 3773 * don't compare port. 3774 * IN: 3775 * saidx0: source, it can be in SAD. 3776 * saidx1: object. 3777 * OUT: 3778 * 1 : equal 3779 * 0 : not equal 3780 */ 3781static int 3782key_cmpsaidx( 3783 const struct secasindex *saidx0, 3784 const struct secasindex *saidx1, 3785 int flag) 3786{ 3787 /* sanity */ 3788 if (saidx0 == NULL && saidx1 == NULL) 3789 return 1; 3790 3791 if (saidx0 == NULL || saidx1 == NULL) 3792 return 0; 3793 3794 if (saidx0->proto != saidx1->proto) 3795 return 0; 3796 3797 if (flag == CMP_EXACTLY) { 3798 if (saidx0->mode != saidx1->mode) 3799 return 0; 3800 if (saidx0->reqid != saidx1->reqid) 3801 return 0; 3802 if (bcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 3803 bcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 3804 return 0; 3805 } else { 3806 3807 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 3808 if (flag == CMP_MODE_REQID 3809 ||flag == CMP_REQID) { 3810 /* 3811 * If reqid of SPD is non-zero, unique SA is required. 3812 * The result must be of same reqid in this case. 3813 */ 3814 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 3815 return 0; 3816 } 3817 3818 if (flag == CMP_MODE_REQID) { 3819 if (saidx0->mode != IPSEC_MODE_ANY 3820 && saidx0->mode != saidx1->mode) 3821 return 0; 3822 } 3823 3824 if (key_sockaddrcmp(&saidx0->src.sa, &saidx1->src.sa, 0) != 0) { 3825 return 0; 3826 } 3827 if (key_sockaddrcmp(&saidx0->dst.sa, &saidx1->dst.sa, 0) != 0) { 3828 return 0; 3829 } 3830 } 3831 3832 return 1; 3833} 3834 3835/* 3836 * compare two secindex structure exactly. 3837 * IN: 3838 * spidx0: source, it is often in SPD. 3839 * spidx1: object, it is often from PFKEY message. 3840 * OUT: 3841 * 1 : equal 3842 * 0 : not equal 3843 */ 3844static int 3845key_cmpspidx_exactly( 3846 struct secpolicyindex *spidx0, 3847 struct secpolicyindex *spidx1) 3848{ 3849 /* sanity */ 3850 if (spidx0 == NULL && spidx1 == NULL) 3851 return 1; 3852 3853 if (spidx0 == NULL || spidx1 == NULL) 3854 return 0; 3855 3856 if (spidx0->prefs != spidx1->prefs 3857 || spidx0->prefd != spidx1->prefd 3858 || spidx0->ul_proto != spidx1->ul_proto) 3859 return 0; 3860 3861 return key_sockaddrcmp(&spidx0->src.sa, &spidx1->src.sa, 1) == 0 && 3862 key_sockaddrcmp(&spidx0->dst.sa, &spidx1->dst.sa, 1) == 0; 3863} 3864 3865/* 3866 * compare two secindex structure with mask. 3867 * IN: 3868 * spidx0: source, it is often in SPD. 3869 * spidx1: object, it is often from IP header. 3870 * OUT: 3871 * 1 : equal 3872 * 0 : not equal 3873 */ 3874static int 3875key_cmpspidx_withmask( 3876 struct secpolicyindex *spidx0, 3877 struct secpolicyindex *spidx1) 3878{ 3879 /* sanity */ 3880 if (spidx0 == NULL && spidx1 == NULL) 3881 return 1; 3882 3883 if (spidx0 == NULL || spidx1 == NULL) 3884 return 0; 3885 3886 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 3887 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 3888 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 3889 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 3890 return 0; 3891 3892 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 3893 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY 3894 && spidx0->ul_proto != spidx1->ul_proto) 3895 return 0; 3896 3897 switch (spidx0->src.sa.sa_family) { 3898 case AF_INET: 3899 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY 3900 && spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 3901 return 0; 3902 if (!key_bbcmp(&spidx0->src.sin.sin_addr, 3903 &spidx1->src.sin.sin_addr, spidx0->prefs)) 3904 return 0; 3905 break; 3906 case AF_INET6: 3907 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY 3908 && spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 3909 return 0; 3910 /* 3911 * scope_id check. if sin6_scope_id is 0, we regard it 3912 * as a wildcard scope, which matches any scope zone ID. 3913 */ 3914 if (spidx0->src.sin6.sin6_scope_id && 3915 spidx1->src.sin6.sin6_scope_id && 3916 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 3917 return 0; 3918 if (!key_bbcmp(&spidx0->src.sin6.sin6_addr, 3919 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 3920 return 0; 3921 break; 3922 default: 3923 /* XXX */ 3924 if (bcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 3925 return 0; 3926 break; 3927 } 3928 3929 switch (spidx0->dst.sa.sa_family) { 3930 case AF_INET: 3931 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY 3932 && spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 3933 return 0; 3934 if (!key_bbcmp(&spidx0->dst.sin.sin_addr, 3935 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 3936 return 0; 3937 break; 3938 case AF_INET6: 3939 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY 3940 && spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 3941 return 0; 3942 /* 3943 * scope_id check. if sin6_scope_id is 0, we regard it 3944 * as a wildcard scope, which matches any scope zone ID. 3945 */ 3946 if (spidx0->dst.sin6.sin6_scope_id && 3947 spidx1->dst.sin6.sin6_scope_id && 3948 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 3949 return 0; 3950 if (!key_bbcmp(&spidx0->dst.sin6.sin6_addr, 3951 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 3952 return 0; 3953 break; 3954 default: 3955 /* XXX */ 3956 if (bcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 3957 return 0; 3958 break; 3959 } 3960 3961 /* XXX Do we check other field ? e.g. flowinfo */ 3962 3963 return 1; 3964} 3965 3966/* returns 0 on match */ 3967static int 3968key_sockaddrcmp( 3969 const struct sockaddr *sa1, 3970 const struct sockaddr *sa2, 3971 int port) 3972{ 3973#ifdef satosin 3974#undef satosin 3975#endif 3976#define satosin(s) ((const struct sockaddr_in *)s) 3977#ifdef satosin6 3978#undef satosin6 3979#endif 3980#define satosin6(s) ((const struct sockaddr_in6 *)s) 3981 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) 3982 return 1; 3983 3984 switch (sa1->sa_family) { 3985 case AF_INET: 3986 if (sa1->sa_len != sizeof(struct sockaddr_in)) 3987 return 1; 3988 if (satosin(sa1)->sin_addr.s_addr != 3989 satosin(sa2)->sin_addr.s_addr) { 3990 return 1; 3991 } 3992 if (port && satosin(sa1)->sin_port != satosin(sa2)->sin_port) 3993 return 1; 3994 break; 3995 case AF_INET6: 3996 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 3997 return 1; /*EINVAL*/ 3998 if (satosin6(sa1)->sin6_scope_id != 3999 satosin6(sa2)->sin6_scope_id) { 4000 return 1; 4001 } 4002 if (!IN6_ARE_ADDR_EQUAL(&satosin6(sa1)->sin6_addr, 4003 &satosin6(sa2)->sin6_addr)) { 4004 return 1; 4005 } 4006 if (port && 4007 satosin6(sa1)->sin6_port != satosin6(sa2)->sin6_port) { 4008 return 1; 4009 } 4010 break; 4011 default: 4012 if (bcmp(sa1, sa2, sa1->sa_len) != 0) 4013 return 1; 4014 break; 4015 } 4016 4017 return 0; 4018#undef satosin 4019#undef satosin6 4020} 4021 4022/* 4023 * compare two buffers with mask. 4024 * IN: 4025 * addr1: source 4026 * addr2: object 4027 * bits: Number of bits to compare 4028 * OUT: 4029 * 1 : equal 4030 * 0 : not equal 4031 */ 4032static int 4033key_bbcmp(const void *a1, const void *a2, u_int bits) 4034{ 4035 const unsigned char *p1 = a1; 4036 const unsigned char *p2 = a2; 4037 4038 /* XXX: This could be considerably faster if we compare a word 4039 * at a time, but it is complicated on LSB Endian machines */ 4040 4041 /* Handle null pointers */ 4042 if (p1 == NULL || p2 == NULL) 4043 return (p1 == p2); 4044 4045 while (bits >= 8) { 4046 if (*p1++ != *p2++) 4047 return 0; 4048 bits -= 8; 4049 } 4050 4051 if (bits > 0) { 4052 u_int8_t mask = ~((1<<(8-bits))-1); 4053 if ((*p1 & mask) != (*p2 & mask)) 4054 return 0; 4055 } 4056 return 1; /* Match! */ 4057} 4058 4059static void 4060key_flush_spd(time_t now) 4061{ 4062 static u_int16_t sptree_scangen = 0; 4063 u_int16_t gen = sptree_scangen++; 4064 struct secpolicy *sp; 4065 u_int dir; 4066 4067 /* SPD */ 4068 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4069restart: 4070 SPTREE_LOCK(); 4071 LIST_FOREACH(sp, &sptree[dir], chain) { 4072 if (sp->scangen == gen) /* previously handled */ 4073 continue; 4074 sp->scangen = gen; 4075 if (sp->state == IPSEC_SPSTATE_DEAD) { 4076 /* NB: clean entries created by key_spdflush */ 4077 SPTREE_UNLOCK(); 4078 KEY_FREESP(&sp); 4079 goto restart; 4080 } 4081 if (sp->lifetime == 0 && sp->validtime == 0) 4082 continue; 4083 if ((sp->lifetime && now - sp->created > sp->lifetime) 4084 || (sp->validtime && now - sp->lastused > sp->validtime)) { 4085 sp->state = IPSEC_SPSTATE_DEAD; 4086 SPTREE_UNLOCK(); 4087 key_spdexpire(sp); 4088 KEY_FREESP(&sp); 4089 goto restart; 4090 } 4091 } 4092 SPTREE_UNLOCK(); 4093 } 4094} 4095 4096static void 4097key_flush_sad(time_t now) 4098{ 4099 struct secashead *sah, *nextsah; 4100 struct secasvar *sav, *nextsav; 4101 4102 /* SAD */ 4103 SAHTREE_LOCK(); 4104 LIST_FOREACH_SAFE(sah, &sahtree, chain, nextsah) { 4105 /* if sah has been dead, then delete it and process next sah. */ 4106 if (sah->state == SADB_SASTATE_DEAD) { 4107 key_delsah(sah); 4108 continue; 4109 } 4110 4111 /* if LARVAL entry doesn't become MATURE, delete it. */ 4112 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], chain, nextsav) { 4113 if (now - sav->created > key_larval_lifetime) 4114 KEY_FREESAV(&sav); 4115 } 4116 4117 /* 4118 * check MATURE entry to start to send expire message 4119 * whether or not. 4120 */ 4121 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], chain, nextsav) { 4122 /* we don't need to check. */ 4123 if (sav->lft_s == NULL) 4124 continue; 4125 4126 /* sanity check */ 4127 if (sav->lft_c == NULL) { 4128 ipseclog((LOG_DEBUG,"%s: there is no CURRENT " 4129 "time, why?\n", __func__)); 4130 continue; 4131 } 4132 4133 /* check SOFT lifetime */ 4134 if (sav->lft_s->addtime != 0 && 4135 now - sav->created > sav->lft_s->addtime) { 4136 /* 4137 * check SA to be used whether or not. 4138 * when SA hasn't been used, delete it. 4139 */ 4140 if (sav->lft_c->usetime == 0) { 4141 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4142 KEY_FREESAV(&sav); 4143 } else { 4144 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4145 /* 4146 * XXX If we keep to send expire 4147 * message in the status of 4148 * DYING. Do remove below code. 4149 */ 4150 key_expire(sav); 4151 } 4152 } 4153 /* check SOFT lifetime by bytes */ 4154 /* 4155 * XXX I don't know the way to delete this SA 4156 * when new SA is installed. Caution when it's 4157 * installed too big lifetime by time. 4158 */ 4159 else if (sav->lft_s->bytes != 0 && 4160 sav->lft_s->bytes < sav->lft_c->bytes) { 4161 4162 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4163 /* 4164 * XXX If we keep to send expire 4165 * message in the status of 4166 * DYING. Do remove below code. 4167 */ 4168 key_expire(sav); 4169 } 4170 } 4171 4172 /* check DYING entry to change status to DEAD. */ 4173 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], chain, nextsav) { 4174 /* we don't need to check. */ 4175 if (sav->lft_h == NULL) 4176 continue; 4177 4178 /* sanity check */ 4179 if (sav->lft_c == NULL) { 4180 ipseclog((LOG_DEBUG, "%s: there is no CURRENT " 4181 "time, why?\n", __func__)); 4182 continue; 4183 } 4184 4185 if (sav->lft_h->addtime != 0 && 4186 now - sav->created > sav->lft_h->addtime) { 4187 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4188 KEY_FREESAV(&sav); 4189 } 4190#if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4191 else if (sav->lft_s != NULL 4192 && sav->lft_s->addtime != 0 4193 && now - sav->created > sav->lft_s->addtime) { 4194 /* 4195 * XXX: should be checked to be 4196 * installed the valid SA. 4197 */ 4198 4199 /* 4200 * If there is no SA then sending 4201 * expire message. 4202 */ 4203 key_expire(sav); 4204 } 4205#endif 4206 /* check HARD lifetime by bytes */ 4207 else if (sav->lft_h->bytes != 0 && 4208 sav->lft_h->bytes < sav->lft_c->bytes) { 4209 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4210 KEY_FREESAV(&sav); 4211 } 4212 } 4213 4214 /* delete entry in DEAD */ 4215 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], chain, nextsav) { 4216 /* sanity check */ 4217 if (sav->state != SADB_SASTATE_DEAD) { 4218 ipseclog((LOG_DEBUG, "%s: invalid sav->state " 4219 "(queue: %d SA: %d): kill it anyway\n", 4220 __func__, 4221 SADB_SASTATE_DEAD, sav->state)); 4222 } 4223 /* 4224 * do not call key_freesav() here. 4225 * sav should already be freed, and sav->refcnt 4226 * shows other references to sav 4227 * (such as from SPD). 4228 */ 4229 } 4230 } 4231 SAHTREE_UNLOCK(); 4232} 4233 4234static void 4235key_flush_acq(time_t now) 4236{ 4237 struct secacq *acq, *nextacq; 4238 4239 /* ACQ tree */ 4240 ACQ_LOCK(); 4241 for (acq = LIST_FIRST(&acqtree); acq != NULL; acq = nextacq) { 4242 nextacq = LIST_NEXT(acq, chain); 4243 if (now - acq->created > key_blockacq_lifetime 4244 && __LIST_CHAINED(acq)) { 4245 LIST_REMOVE(acq, chain); 4246 free(acq, M_IPSEC_SAQ); 4247 } 4248 } 4249 ACQ_UNLOCK(); 4250} 4251 4252static void 4253key_flush_spacq(time_t now) 4254{ 4255 struct secspacq *acq, *nextacq; 4256 4257 /* SP ACQ tree */ 4258 SPACQ_LOCK(); 4259 for (acq = LIST_FIRST(&spacqtree); acq != NULL; acq = nextacq) { 4260 nextacq = LIST_NEXT(acq, chain); 4261 if (now - acq->created > key_blockacq_lifetime 4262 && __LIST_CHAINED(acq)) { 4263 LIST_REMOVE(acq, chain); 4264 free(acq, M_IPSEC_SAQ); 4265 } 4266 } 4267 SPACQ_UNLOCK(); 4268} 4269 4270/* 4271 * time handler. 4272 * scanning SPD and SAD to check status for each entries, 4273 * and do to remove or to expire. 4274 * XXX: year 2038 problem may remain. 4275 */ 4276void 4277key_timehandler(void) 4278{ 4279 time_t now = time_second; 4280 4281 key_flush_spd(now); 4282 key_flush_sad(now); 4283 key_flush_acq(now); 4284 key_flush_spacq(now); 4285 4286#ifndef IPSEC_DEBUG2 4287 /* do exchange to tick time !! */ 4288 (void)timeout((void *)key_timehandler, (void *)0, hz); 4289#endif /* IPSEC_DEBUG2 */ 4290} 4291 4292u_long 4293key_random() 4294{ 4295 u_long value; 4296 4297 key_randomfill(&value, sizeof(value)); 4298 return value; 4299} 4300 4301void 4302key_randomfill(p, l) 4303 void *p; 4304 size_t l; 4305{ 4306 size_t n; 4307 u_long v; 4308 static int warn = 1; 4309 4310 n = 0; 4311 n = (size_t)read_random(p, (u_int)l); 4312 /* last resort */ 4313 while (n < l) { 4314 v = random(); 4315 bcopy(&v, (u_int8_t *)p + n, 4316 l - n < sizeof(v) ? l - n : sizeof(v)); 4317 n += sizeof(v); 4318 4319 if (warn) { 4320 printf("WARNING: pseudo-random number generator " 4321 "used for IPsec processing\n"); 4322 warn = 0; 4323 } 4324 } 4325} 4326 4327/* 4328 * map SADB_SATYPE_* to IPPROTO_*. 4329 * if satype == SADB_SATYPE then satype is mapped to ~0. 4330 * OUT: 4331 * 0: invalid satype. 4332 */ 4333static u_int16_t 4334key_satype2proto(satype) 4335 u_int8_t satype; 4336{ 4337 switch (satype) { 4338 case SADB_SATYPE_UNSPEC: 4339 return IPSEC_PROTO_ANY; 4340 case SADB_SATYPE_AH: 4341 return IPPROTO_AH; 4342 case SADB_SATYPE_ESP: 4343 return IPPROTO_ESP; 4344 case SADB_X_SATYPE_IPCOMP: 4345 return IPPROTO_IPCOMP; 4346 case SADB_X_SATYPE_TCPSIGNATURE: 4347 return IPPROTO_TCP; 4348 default: 4349 return 0; 4350 } 4351 /* NOTREACHED */ 4352} 4353 4354/* 4355 * map IPPROTO_* to SADB_SATYPE_* 4356 * OUT: 4357 * 0: invalid protocol type. 4358 */ 4359static u_int8_t 4360key_proto2satype(proto) 4361 u_int16_t proto; 4362{ 4363 switch (proto) { 4364 case IPPROTO_AH: 4365 return SADB_SATYPE_AH; 4366 case IPPROTO_ESP: 4367 return SADB_SATYPE_ESP; 4368 case IPPROTO_IPCOMP: 4369 return SADB_X_SATYPE_IPCOMP; 4370 case IPPROTO_TCP: 4371 return SADB_X_SATYPE_TCPSIGNATURE; 4372 default: 4373 return 0; 4374 } 4375 /* NOTREACHED */ 4376} 4377 4378/* %%% PF_KEY */ 4379/* 4380 * SADB_GETSPI processing is to receive 4381 * <base, (SA2), src address, dst address, (SPI range)> 4382 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4383 * tree with the status of LARVAL, and send 4384 * <base, SA(*), address(SD)> 4385 * to the IKMPd. 4386 * 4387 * IN: mhp: pointer to the pointer to each header. 4388 * OUT: NULL if fail. 4389 * other if success, return pointer to the message to send. 4390 */ 4391static int 4392key_getspi(so, m, mhp) 4393 struct socket *so; 4394 struct mbuf *m; 4395 const struct sadb_msghdr *mhp; 4396{ 4397 struct sadb_address *src0, *dst0; 4398 struct secasindex saidx; 4399 struct secashead *newsah; 4400 struct secasvar *newsav; 4401 u_int8_t proto; 4402 u_int32_t spi; 4403 u_int8_t mode; 4404 u_int32_t reqid; 4405 int error; 4406 4407 IPSEC_ASSERT(so != NULL, ("null socket")); 4408 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4409 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4410 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4411 4412 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4413 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4414 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4415 __func__)); 4416 return key_senderror(so, m, EINVAL); 4417 } 4418 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4419 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4420 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4421 __func__)); 4422 return key_senderror(so, m, EINVAL); 4423 } 4424 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4425 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4426 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4427 } else { 4428 mode = IPSEC_MODE_ANY; 4429 reqid = 0; 4430 } 4431 4432 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4433 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4434 4435 /* map satype to proto */ 4436 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4437 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4438 __func__)); 4439 return key_senderror(so, m, EINVAL); 4440 } 4441 4442 /* make sure if port number is zero. */ 4443 switch (((struct sockaddr *)(src0 + 1))->sa_family) { 4444 case AF_INET: 4445 if (((struct sockaddr *)(src0 + 1))->sa_len != 4446 sizeof(struct sockaddr_in)) 4447 return key_senderror(so, m, EINVAL); 4448 ((struct sockaddr_in *)(src0 + 1))->sin_port = 0; 4449 break; 4450 case AF_INET6: 4451 if (((struct sockaddr *)(src0 + 1))->sa_len != 4452 sizeof(struct sockaddr_in6)) 4453 return key_senderror(so, m, EINVAL); 4454 ((struct sockaddr_in6 *)(src0 + 1))->sin6_port = 0; 4455 break; 4456 default: 4457 ; /*???*/ 4458 } 4459 switch (((struct sockaddr *)(dst0 + 1))->sa_family) { 4460 case AF_INET: 4461 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4462 sizeof(struct sockaddr_in)) 4463 return key_senderror(so, m, EINVAL); 4464 ((struct sockaddr_in *)(dst0 + 1))->sin_port = 0; 4465 break; 4466 case AF_INET6: 4467 if (((struct sockaddr *)(dst0 + 1))->sa_len != 4468 sizeof(struct sockaddr_in6)) 4469 return key_senderror(so, m, EINVAL); 4470 ((struct sockaddr_in6 *)(dst0 + 1))->sin6_port = 0; 4471 break; 4472 default: 4473 ; /*???*/ 4474 } 4475 4476 /* XXX boundary check against sa_len */ 4477 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4478 4479 /* SPI allocation */ 4480 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4481 &saidx); 4482 if (spi == 0) 4483 return key_senderror(so, m, EINVAL); 4484 4485 /* get a SA index */ 4486 if ((newsah = key_getsah(&saidx)) == NULL) { 4487 /* create a new SA index */ 4488 if ((newsah = key_newsah(&saidx)) == NULL) { 4489 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4490 return key_senderror(so, m, ENOBUFS); 4491 } 4492 } 4493 4494 /* get a new SA */ 4495 /* XXX rewrite */ 4496 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4497 if (newsav == NULL) { 4498 /* XXX don't free new SA index allocated in above. */ 4499 return key_senderror(so, m, error); 4500 } 4501 4502 /* set spi */ 4503 newsav->spi = htonl(spi); 4504 4505 /* delete the entry in acqtree */ 4506 if (mhp->msg->sadb_msg_seq != 0) { 4507 struct secacq *acq; 4508 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) != NULL) { 4509 /* reset counter in order to deletion by timehandler. */ 4510 acq->created = time_second; 4511 acq->count = 0; 4512 } 4513 } 4514 4515 { 4516 struct mbuf *n, *nn; 4517 struct sadb_sa *m_sa; 4518 struct sadb_msg *newmsg; 4519 int off, len; 4520 4521 /* create new sadb_msg to reply. */ 4522 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4523 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4524 if (len > MCLBYTES) 4525 return key_senderror(so, m, ENOBUFS); 4526 4527 MGETHDR(n, M_DONTWAIT, MT_DATA); 4528 if (len > MHLEN) { 4529 MCLGET(n, M_DONTWAIT); 4530 if ((n->m_flags & M_EXT) == 0) { 4531 m_freem(n); 4532 n = NULL; 4533 } 4534 } 4535 if (!n) 4536 return key_senderror(so, m, ENOBUFS); 4537 4538 n->m_len = len; 4539 n->m_next = NULL; 4540 off = 0; 4541 4542 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 4543 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4544 4545 m_sa = (struct sadb_sa *)(mtod(n, caddr_t) + off); 4546 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4547 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4548 m_sa->sadb_sa_spi = htonl(spi); 4549 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4550 4551 IPSEC_ASSERT(off == len, 4552 ("length inconsistency (off %u len %u)", off, len)); 4553 4554 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4555 SADB_EXT_ADDRESS_DST); 4556 if (!n->m_next) { 4557 m_freem(n); 4558 return key_senderror(so, m, ENOBUFS); 4559 } 4560 4561 if (n->m_len < sizeof(struct sadb_msg)) { 4562 n = m_pullup(n, sizeof(struct sadb_msg)); 4563 if (n == NULL) 4564 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4565 } 4566 4567 n->m_pkthdr.len = 0; 4568 for (nn = n; nn; nn = nn->m_next) 4569 n->m_pkthdr.len += nn->m_len; 4570 4571 newmsg = mtod(n, struct sadb_msg *); 4572 newmsg->sadb_msg_seq = newsav->seq; 4573 newmsg->sadb_msg_errno = 0; 4574 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 4575 4576 m_freem(m); 4577 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4578 } 4579} 4580 4581/* 4582 * allocating new SPI 4583 * called by key_getspi(). 4584 * OUT: 4585 * 0: failure. 4586 * others: success. 4587 */ 4588static u_int32_t 4589key_do_getnewspi(spirange, saidx) 4590 struct sadb_spirange *spirange; 4591 struct secasindex *saidx; 4592{ 4593 u_int32_t newspi; 4594 u_int32_t min, max; 4595 int count = key_spi_trycnt; 4596 4597 /* set spi range to allocate */ 4598 if (spirange != NULL) { 4599 min = spirange->sadb_spirange_min; 4600 max = spirange->sadb_spirange_max; 4601 } else { 4602 min = key_spi_minval; 4603 max = key_spi_maxval; 4604 } 4605 /* IPCOMP needs 2-byte SPI */ 4606 if (saidx->proto == IPPROTO_IPCOMP) { 4607 u_int32_t t; 4608 if (min >= 0x10000) 4609 min = 0xffff; 4610 if (max >= 0x10000) 4611 max = 0xffff; 4612 if (min > max) { 4613 t = min; min = max; max = t; 4614 } 4615 } 4616 4617 if (min == max) { 4618 if (key_checkspidup(saidx, min) != NULL) { 4619 ipseclog((LOG_DEBUG, "%s: SPI %u exists already.\n", 4620 __func__, min)); 4621 return 0; 4622 } 4623 4624 count--; /* taking one cost. */ 4625 newspi = min; 4626 4627 } else { 4628 4629 /* init SPI */ 4630 newspi = 0; 4631 4632 /* when requesting to allocate spi ranged */ 4633 while (count--) { 4634 /* generate pseudo-random SPI value ranged. */ 4635 newspi = min + (key_random() % (max - min + 1)); 4636 4637 if (key_checkspidup(saidx, newspi) == NULL) 4638 break; 4639 } 4640 4641 if (count == 0 || newspi == 0) { 4642 ipseclog((LOG_DEBUG, "%s: to allocate spi is failed.\n", 4643 __func__)); 4644 return 0; 4645 } 4646 } 4647 4648 /* statistics */ 4649 keystat.getspi_count = 4650 (keystat.getspi_count + key_spi_trycnt - count) / 2; 4651 4652 return newspi; 4653} 4654 4655/* 4656 * SADB_UPDATE processing 4657 * receive 4658 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4659 * key(AE), (identity(SD),) (sensitivity)> 4660 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 4661 * and send 4662 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4663 * (identity(SD),) (sensitivity)> 4664 * to the ikmpd. 4665 * 4666 * m will always be freed. 4667 */ 4668static int 4669key_update(so, m, mhp) 4670 struct socket *so; 4671 struct mbuf *m; 4672 const struct sadb_msghdr *mhp; 4673{ 4674 struct sadb_sa *sa0; 4675 struct sadb_address *src0, *dst0; 4676 struct secasindex saidx; 4677 struct secashead *sah; 4678 struct secasvar *sav; 4679 u_int16_t proto; 4680 u_int8_t mode; 4681 u_int32_t reqid; 4682 int error; 4683 4684 IPSEC_ASSERT(so != NULL, ("null socket")); 4685 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4686 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4687 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4688 4689 /* map satype to proto */ 4690 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4691 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4692 __func__)); 4693 return key_senderror(so, m, EINVAL); 4694 } 4695 4696 if (mhp->ext[SADB_EXT_SA] == NULL || 4697 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4698 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4699 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4700 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4701 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4702 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4703 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4704 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4705 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4706 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4707 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4708 __func__)); 4709 return key_senderror(so, m, EINVAL); 4710 } 4711 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4712 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4713 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4714 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4715 __func__)); 4716 return key_senderror(so, m, EINVAL); 4717 } 4718 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4719 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4720 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4721 } else { 4722 mode = IPSEC_MODE_ANY; 4723 reqid = 0; 4724 } 4725 /* XXX boundary checking for other extensions */ 4726 4727 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4728 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 4729 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 4730 4731 /* XXX boundary check against sa_len */ 4732 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4733 4734 /* get a SA header */ 4735 if ((sah = key_getsah(&saidx)) == NULL) { 4736 ipseclog((LOG_DEBUG, "%s: no SA index found.\n", __func__)); 4737 return key_senderror(so, m, ENOENT); 4738 } 4739 4740 /* set spidx if there */ 4741 /* XXX rewrite */ 4742 error = key_setident(sah, m, mhp); 4743 if (error) 4744 return key_senderror(so, m, error); 4745 4746 /* find a SA with sequence number. */ 4747#ifdef IPSEC_DOSEQCHECK 4748 if (mhp->msg->sadb_msg_seq != 0 4749 && (sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq)) == NULL) { 4750 ipseclog((LOG_DEBUG, "%s: no larval SA with sequence %u " 4751 "exists.\n", __func__, mhp->msg->sadb_msg_seq)); 4752 return key_senderror(so, m, ENOENT); 4753 } 4754#else 4755 SAHTREE_LOCK(); 4756 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 4757 SAHTREE_UNLOCK(); 4758 if (sav == NULL) { 4759 ipseclog((LOG_DEBUG, "%s: no such a SA found (spi:%u)\n", 4760 __func__, (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4761 return key_senderror(so, m, EINVAL); 4762 } 4763#endif 4764 4765 /* validity check */ 4766 if (sav->sah->saidx.proto != proto) { 4767 ipseclog((LOG_DEBUG, "%s: protocol mismatched " 4768 "(DB=%u param=%u)\n", __func__, 4769 sav->sah->saidx.proto, proto)); 4770 return key_senderror(so, m, EINVAL); 4771 } 4772#ifdef IPSEC_DOSEQCHECK 4773 if (sav->spi != sa0->sadb_sa_spi) { 4774 ipseclog((LOG_DEBUG, "%s: SPI mismatched (DB:%u param:%u)\n", 4775 __func__, 4776 (u_int32_t)ntohl(sav->spi), 4777 (u_int32_t)ntohl(sa0->sadb_sa_spi))); 4778 return key_senderror(so, m, EINVAL); 4779 } 4780#endif 4781 if (sav->pid != mhp->msg->sadb_msg_pid) { 4782 ipseclog((LOG_DEBUG, "%s: pid mismatched (DB:%u param:%u)\n", 4783 __func__, sav->pid, mhp->msg->sadb_msg_pid)); 4784 return key_senderror(so, m, EINVAL); 4785 } 4786 4787 /* copy sav values */ 4788 error = key_setsaval(sav, m, mhp); 4789 if (error) { 4790 KEY_FREESAV(&sav); 4791 return key_senderror(so, m, error); 4792 } 4793 4794 /* check SA values to be mature. */ 4795 if ((mhp->msg->sadb_msg_errno = key_mature(sav)) != 0) { 4796 KEY_FREESAV(&sav); 4797 return key_senderror(so, m, 0); 4798 } 4799 4800 { 4801 struct mbuf *n; 4802 4803 /* set msg buf from mhp */ 4804 n = key_getmsgbuf_x1(m, mhp); 4805 if (n == NULL) { 4806 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4807 return key_senderror(so, m, ENOBUFS); 4808 } 4809 4810 m_freem(m); 4811 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4812 } 4813} 4814 4815/* 4816 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 4817 * only called by key_update(). 4818 * OUT: 4819 * NULL : not found 4820 * others : found, pointer to a SA. 4821 */ 4822#ifdef IPSEC_DOSEQCHECK 4823static struct secasvar * 4824key_getsavbyseq(sah, seq) 4825 struct secashead *sah; 4826 u_int32_t seq; 4827{ 4828 struct secasvar *sav; 4829 u_int state; 4830 4831 state = SADB_SASTATE_LARVAL; 4832 4833 /* search SAD with sequence number ? */ 4834 LIST_FOREACH(sav, &sah->savtree[state], chain) { 4835 4836 KEY_CHKSASTATE(state, sav->state, __func__); 4837 4838 if (sav->seq == seq) { 4839 sa_addref(sav); 4840 KEYDEBUG(KEYDEBUG_IPSEC_STAMP, 4841 printf("DP %s cause refcnt++:%d SA:%p\n", 4842 __func__, sav->refcnt, sav)); 4843 return sav; 4844 } 4845 } 4846 4847 return NULL; 4848} 4849#endif 4850 4851/* 4852 * SADB_ADD processing 4853 * add an entry to SA database, when received 4854 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4855 * key(AE), (identity(SD),) (sensitivity)> 4856 * from the ikmpd, 4857 * and send 4858 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 4859 * (identity(SD),) (sensitivity)> 4860 * to the ikmpd. 4861 * 4862 * IGNORE identity and sensitivity messages. 4863 * 4864 * m will always be freed. 4865 */ 4866static int 4867key_add(so, m, mhp) 4868 struct socket *so; 4869 struct mbuf *m; 4870 const struct sadb_msghdr *mhp; 4871{ 4872 struct sadb_sa *sa0; 4873 struct sadb_address *src0, *dst0; 4874 struct secasindex saidx; 4875 struct secashead *newsah; 4876 struct secasvar *newsav; 4877 u_int16_t proto; 4878 u_int8_t mode; 4879 u_int32_t reqid; 4880 int error; 4881 4882 IPSEC_ASSERT(so != NULL, ("null socket")); 4883 IPSEC_ASSERT(m != NULL, ("null mbuf")); 4884 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 4885 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 4886 4887 /* map satype to proto */ 4888 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 4889 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 4890 __func__)); 4891 return key_senderror(so, m, EINVAL); 4892 } 4893 4894 if (mhp->ext[SADB_EXT_SA] == NULL || 4895 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4896 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 4897 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 4898 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 4899 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 4900 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 4901 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 4902 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 4903 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 4904 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 4905 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4906 __func__)); 4907 return key_senderror(so, m, EINVAL); 4908 } 4909 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 4910 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4911 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4912 /* XXX need more */ 4913 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 4914 __func__)); 4915 return key_senderror(so, m, EINVAL); 4916 } 4917 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4918 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4919 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4920 } else { 4921 mode = IPSEC_MODE_ANY; 4922 reqid = 0; 4923 } 4924 4925 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 4926 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4927 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4928 4929 /* XXX boundary check against sa_len */ 4930 KEY_SETSECASIDX(proto, mode, reqid, src0 + 1, dst0 + 1, &saidx); 4931 4932 /* get a SA header */ 4933 if ((newsah = key_getsah(&saidx)) == NULL) { 4934 /* create a new SA header */ 4935 if ((newsah = key_newsah(&saidx)) == NULL) { 4936 ipseclog((LOG_DEBUG, "%s: No more memory.\n",__func__)); 4937 return key_senderror(so, m, ENOBUFS); 4938 } 4939 } 4940 4941 /* set spidx if there */ 4942 /* XXX rewrite */ 4943 error = key_setident(newsah, m, mhp); 4944 if (error) { 4945 return key_senderror(so, m, error); 4946 } 4947 4948 /* create new SA entry. */ 4949 /* We can create new SA only if SPI is differenct. */ 4950 SAHTREE_LOCK(); 4951 newsav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 4952 SAHTREE_UNLOCK(); 4953 if (newsav != NULL) { 4954 ipseclog((LOG_DEBUG, "%s: SA already exists.\n", __func__)); 4955 return key_senderror(so, m, EEXIST); 4956 } 4957 newsav = KEY_NEWSAV(m, mhp, newsah, &error); 4958 if (newsav == NULL) { 4959 return key_senderror(so, m, error); 4960 } 4961 4962 /* check SA values to be mature. */ 4963 if ((error = key_mature(newsav)) != 0) { 4964 KEY_FREESAV(&newsav); 4965 return key_senderror(so, m, error); 4966 } 4967 4968 /* 4969 * don't call key_freesav() here, as we would like to keep the SA 4970 * in the database on success. 4971 */ 4972 4973 { 4974 struct mbuf *n; 4975 4976 /* set msg buf from mhp */ 4977 n = key_getmsgbuf_x1(m, mhp); 4978 if (n == NULL) { 4979 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 4980 return key_senderror(so, m, ENOBUFS); 4981 } 4982 4983 m_freem(m); 4984 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 4985 } 4986} 4987 4988/* m is retained */ 4989static int 4990key_setident(sah, m, mhp) 4991 struct secashead *sah; 4992 struct mbuf *m; 4993 const struct sadb_msghdr *mhp; 4994{ 4995 const struct sadb_ident *idsrc, *iddst; 4996 int idsrclen, iddstlen; 4997 4998 IPSEC_ASSERT(sah != NULL, ("null secashead")); 4999 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5000 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5001 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5002 5003 /* don't make buffer if not there */ 5004 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5005 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5006 sah->idents = NULL; 5007 sah->identd = NULL; 5008 return 0; 5009 } 5010 5011 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5012 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5013 ipseclog((LOG_DEBUG, "%s: invalid identity.\n", __func__)); 5014 return EINVAL; 5015 } 5016 5017 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5018 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5019 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5020 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5021 5022 /* validity check */ 5023 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5024 ipseclog((LOG_DEBUG, "%s: ident type mismatch.\n", __func__)); 5025 return EINVAL; 5026 } 5027 5028 switch (idsrc->sadb_ident_type) { 5029 case SADB_IDENTTYPE_PREFIX: 5030 case SADB_IDENTTYPE_FQDN: 5031 case SADB_IDENTTYPE_USERFQDN: 5032 default: 5033 /* XXX do nothing */ 5034 sah->idents = NULL; 5035 sah->identd = NULL; 5036 return 0; 5037 } 5038 5039 /* make structure */ 5040 sah->idents = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5041 if (sah->idents == NULL) { 5042 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5043 return ENOBUFS; 5044 } 5045 sah->identd = malloc(sizeof(struct secident), M_IPSEC_MISC, M_NOWAIT); 5046 if (sah->identd == NULL) { 5047 free(sah->idents, M_IPSEC_MISC); 5048 sah->idents = NULL; 5049 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5050 return ENOBUFS; 5051 } 5052 sah->idents->type = idsrc->sadb_ident_type; 5053 sah->idents->id = idsrc->sadb_ident_id; 5054 5055 sah->identd->type = iddst->sadb_ident_type; 5056 sah->identd->id = iddst->sadb_ident_id; 5057 5058 return 0; 5059} 5060 5061/* 5062 * m will not be freed on return. 5063 * it is caller's responsibility to free the result. 5064 */ 5065static struct mbuf * 5066key_getmsgbuf_x1(m, mhp) 5067 struct mbuf *m; 5068 const struct sadb_msghdr *mhp; 5069{ 5070 struct mbuf *n; 5071 5072 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5073 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5074 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5075 5076 /* create new sadb_msg to reply. */ 5077 n = key_gather_mbuf(m, mhp, 1, 9, SADB_EXT_RESERVED, 5078 SADB_EXT_SA, SADB_X_EXT_SA2, 5079 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5080 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5081 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST); 5082 if (!n) 5083 return NULL; 5084 5085 if (n->m_len < sizeof(struct sadb_msg)) { 5086 n = m_pullup(n, sizeof(struct sadb_msg)); 5087 if (n == NULL) 5088 return NULL; 5089 } 5090 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5091 mtod(n, struct sadb_msg *)->sadb_msg_len = 5092 PFKEY_UNIT64(n->m_pkthdr.len); 5093 5094 return n; 5095} 5096 5097static int key_delete_all __P((struct socket *, struct mbuf *, 5098 const struct sadb_msghdr *, u_int16_t)); 5099 5100/* 5101 * SADB_DELETE processing 5102 * receive 5103 * <base, SA(*), address(SD)> 5104 * from the ikmpd, and set SADB_SASTATE_DEAD, 5105 * and send, 5106 * <base, SA(*), address(SD)> 5107 * to the ikmpd. 5108 * 5109 * m will always be freed. 5110 */ 5111static int 5112key_delete(so, m, mhp) 5113 struct socket *so; 5114 struct mbuf *m; 5115 const struct sadb_msghdr *mhp; 5116{ 5117 struct sadb_sa *sa0; 5118 struct sadb_address *src0, *dst0; 5119 struct secasindex saidx; 5120 struct secashead *sah; 5121 struct secasvar *sav = NULL; 5122 u_int16_t proto; 5123 5124 IPSEC_ASSERT(so != NULL, ("null socket")); 5125 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5126 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5127 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5128 5129 /* map satype to proto */ 5130 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5131 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5132 __func__)); 5133 return key_senderror(so, m, EINVAL); 5134 } 5135 5136 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5137 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5138 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5139 __func__)); 5140 return key_senderror(so, m, EINVAL); 5141 } 5142 5143 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5144 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5145 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5146 __func__)); 5147 return key_senderror(so, m, EINVAL); 5148 } 5149 5150 if (mhp->ext[SADB_EXT_SA] == NULL) { 5151 /* 5152 * Caller wants us to delete all non-LARVAL SAs 5153 * that match the src/dst. This is used during 5154 * IKE INITIAL-CONTACT. 5155 */ 5156 ipseclog((LOG_DEBUG, "%s: doing delete all.\n", __func__)); 5157 return key_delete_all(so, m, mhp, proto); 5158 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5159 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5160 __func__)); 5161 return key_senderror(so, m, EINVAL); 5162 } 5163 5164 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5165 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5166 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5167 5168 /* XXX boundary check against sa_len */ 5169 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5170 5171 /* get a SA header */ 5172 SAHTREE_LOCK(); 5173 LIST_FOREACH(sah, &sahtree, chain) { 5174 if (sah->state == SADB_SASTATE_DEAD) 5175 continue; 5176 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5177 continue; 5178 5179 /* get a SA with SPI. */ 5180 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5181 if (sav) 5182 break; 5183 } 5184 if (sah == NULL) { 5185 SAHTREE_UNLOCK(); 5186 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5187 return key_senderror(so, m, ENOENT); 5188 } 5189 5190 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5191 SAHTREE_UNLOCK(); 5192 KEY_FREESAV(&sav); 5193 5194 { 5195 struct mbuf *n; 5196 struct sadb_msg *newmsg; 5197 5198 /* create new sadb_msg to reply. */ 5199 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5200 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5201 if (!n) 5202 return key_senderror(so, m, ENOBUFS); 5203 5204 if (n->m_len < sizeof(struct sadb_msg)) { 5205 n = m_pullup(n, sizeof(struct sadb_msg)); 5206 if (n == NULL) 5207 return key_senderror(so, m, ENOBUFS); 5208 } 5209 newmsg = mtod(n, struct sadb_msg *); 5210 newmsg->sadb_msg_errno = 0; 5211 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5212 5213 m_freem(m); 5214 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5215 } 5216} 5217 5218/* 5219 * delete all SAs for src/dst. Called from key_delete(). 5220 */ 5221static int 5222key_delete_all(so, m, mhp, proto) 5223 struct socket *so; 5224 struct mbuf *m; 5225 const struct sadb_msghdr *mhp; 5226 u_int16_t proto; 5227{ 5228 struct sadb_address *src0, *dst0; 5229 struct secasindex saidx; 5230 struct secashead *sah; 5231 struct secasvar *sav, *nextsav; 5232 u_int stateidx, state; 5233 5234 src0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_SRC]); 5235 dst0 = (struct sadb_address *)(mhp->ext[SADB_EXT_ADDRESS_DST]); 5236 5237 /* XXX boundary check against sa_len */ 5238 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5239 5240 SAHTREE_LOCK(); 5241 LIST_FOREACH(sah, &sahtree, chain) { 5242 if (sah->state == SADB_SASTATE_DEAD) 5243 continue; 5244 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5245 continue; 5246 5247 /* Delete all non-LARVAL SAs. */ 5248 for (stateidx = 0; 5249 stateidx < _ARRAYLEN(saorder_state_alive); 5250 stateidx++) { 5251 state = saorder_state_alive[stateidx]; 5252 if (state == SADB_SASTATE_LARVAL) 5253 continue; 5254 for (sav = LIST_FIRST(&sah->savtree[state]); 5255 sav != NULL; sav = nextsav) { 5256 nextsav = LIST_NEXT(sav, chain); 5257 /* sanity check */ 5258 if (sav->state != state) { 5259 ipseclog((LOG_DEBUG, "%s: invalid " 5260 "sav->state (queue %d SA %d)\n", 5261 __func__, state, sav->state)); 5262 continue; 5263 } 5264 5265 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5266 KEY_FREESAV(&sav); 5267 } 5268 } 5269 } 5270 SAHTREE_UNLOCK(); 5271 { 5272 struct mbuf *n; 5273 struct sadb_msg *newmsg; 5274 5275 /* create new sadb_msg to reply. */ 5276 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5277 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5278 if (!n) 5279 return key_senderror(so, m, ENOBUFS); 5280 5281 if (n->m_len < sizeof(struct sadb_msg)) { 5282 n = m_pullup(n, sizeof(struct sadb_msg)); 5283 if (n == NULL) 5284 return key_senderror(so, m, ENOBUFS); 5285 } 5286 newmsg = mtod(n, struct sadb_msg *); 5287 newmsg->sadb_msg_errno = 0; 5288 newmsg->sadb_msg_len = PFKEY_UNIT64(n->m_pkthdr.len); 5289 5290 m_freem(m); 5291 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5292 } 5293} 5294 5295/* 5296 * SADB_GET processing 5297 * receive 5298 * <base, SA(*), address(SD)> 5299 * from the ikmpd, and get a SP and a SA to respond, 5300 * and send, 5301 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5302 * (identity(SD),) (sensitivity)> 5303 * to the ikmpd. 5304 * 5305 * m will always be freed. 5306 */ 5307static int 5308key_get(so, m, mhp) 5309 struct socket *so; 5310 struct mbuf *m; 5311 const struct sadb_msghdr *mhp; 5312{ 5313 struct sadb_sa *sa0; 5314 struct sadb_address *src0, *dst0; 5315 struct secasindex saidx; 5316 struct secashead *sah; 5317 struct secasvar *sav = NULL; 5318 u_int16_t proto; 5319 5320 IPSEC_ASSERT(so != NULL, ("null socket")); 5321 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5322 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5323 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5324 5325 /* map satype to proto */ 5326 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5327 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 5328 __func__)); 5329 return key_senderror(so, m, EINVAL); 5330 } 5331 5332 if (mhp->ext[SADB_EXT_SA] == NULL || 5333 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5334 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5335 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5336 __func__)); 5337 return key_senderror(so, m, EINVAL); 5338 } 5339 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5340 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5341 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5342 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 5343 __func__)); 5344 return key_senderror(so, m, EINVAL); 5345 } 5346 5347 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5348 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 5349 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 5350 5351 /* XXX boundary check against sa_len */ 5352 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 5353 5354 /* get a SA header */ 5355 SAHTREE_LOCK(); 5356 LIST_FOREACH(sah, &sahtree, chain) { 5357 if (sah->state == SADB_SASTATE_DEAD) 5358 continue; 5359 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_HEAD) == 0) 5360 continue; 5361 5362 /* get a SA with SPI. */ 5363 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5364 if (sav) 5365 break; 5366 } 5367 SAHTREE_UNLOCK(); 5368 if (sah == NULL) { 5369 ipseclog((LOG_DEBUG, "%s: no SA found.\n", __func__)); 5370 return key_senderror(so, m, ENOENT); 5371 } 5372 5373 { 5374 struct mbuf *n; 5375 u_int8_t satype; 5376 5377 /* map proto to satype */ 5378 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 5379 ipseclog((LOG_DEBUG, "%s: there was invalid proto in SAD.\n", 5380 __func__)); 5381 return key_senderror(so, m, EINVAL); 5382 } 5383 5384 /* create new sadb_msg to reply. */ 5385 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5386 mhp->msg->sadb_msg_pid); 5387 if (!n) 5388 return key_senderror(so, m, ENOBUFS); 5389 5390 m_freem(m); 5391 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5392 } 5393} 5394 5395/* XXX make it sysctl-configurable? */ 5396static void 5397key_getcomb_setlifetime(comb) 5398 struct sadb_comb *comb; 5399{ 5400 5401 comb->sadb_comb_soft_allocations = 1; 5402 comb->sadb_comb_hard_allocations = 1; 5403 comb->sadb_comb_soft_bytes = 0; 5404 comb->sadb_comb_hard_bytes = 0; 5405 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5406 comb->sadb_comb_soft_addtime = comb->sadb_comb_soft_addtime * 80 / 100; 5407 comb->sadb_comb_soft_usetime = 28800; /* 8 hours */ 5408 comb->sadb_comb_hard_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5409} 5410 5411/* 5412 * XXX reorder combinations by preference 5413 * XXX no idea if the user wants ESP authentication or not 5414 */ 5415static struct mbuf * 5416key_getcomb_esp() 5417{ 5418 struct sadb_comb *comb; 5419 struct enc_xform *algo; 5420 struct mbuf *result = NULL, *m, *n; 5421 int encmin; 5422 int i, off, o; 5423 int totlen; 5424 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5425 5426 m = NULL; 5427 for (i = 1; i <= SADB_EALG_MAX; i++) { 5428 algo = esp_algorithm_lookup(i); 5429 if (algo == NULL) 5430 continue; 5431 5432 /* discard algorithms with key size smaller than system min */ 5433 if (_BITS(algo->maxkey) < ipsec_esp_keymin) 5434 continue; 5435 if (_BITS(algo->minkey) < ipsec_esp_keymin) 5436 encmin = ipsec_esp_keymin; 5437 else 5438 encmin = _BITS(algo->minkey); 5439 5440 if (ipsec_esp_auth) 5441 m = key_getcomb_ah(); 5442 else { 5443 IPSEC_ASSERT(l <= MLEN, 5444 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5445 MGET(m, M_DONTWAIT, MT_DATA); 5446 if (m) { 5447 M_ALIGN(m, l); 5448 m->m_len = l; 5449 m->m_next = NULL; 5450 bzero(mtod(m, caddr_t), m->m_len); 5451 } 5452 } 5453 if (!m) 5454 goto fail; 5455 5456 totlen = 0; 5457 for (n = m; n; n = n->m_next) 5458 totlen += n->m_len; 5459 IPSEC_ASSERT((totlen % l) == 0, ("totlen=%u, l=%u", totlen, l)); 5460 5461 for (off = 0; off < totlen; off += l) { 5462 n = m_pulldown(m, off, l, &o); 5463 if (!n) { 5464 /* m is already freed */ 5465 goto fail; 5466 } 5467 comb = (struct sadb_comb *)(mtod(n, caddr_t) + o); 5468 bzero(comb, sizeof(*comb)); 5469 key_getcomb_setlifetime(comb); 5470 comb->sadb_comb_encrypt = i; 5471 comb->sadb_comb_encrypt_minbits = encmin; 5472 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5473 } 5474 5475 if (!result) 5476 result = m; 5477 else 5478 m_cat(result, m); 5479 } 5480 5481 return result; 5482 5483 fail: 5484 if (result) 5485 m_freem(result); 5486 return NULL; 5487} 5488 5489static void 5490key_getsizes_ah( 5491 const struct auth_hash *ah, 5492 int alg, 5493 u_int16_t* min, 5494 u_int16_t* max) 5495{ 5496 *min = *max = ah->keysize; 5497 if (ah->keysize == 0) { 5498 /* 5499 * Transform takes arbitrary key size but algorithm 5500 * key size is restricted. Enforce this here. 5501 */ 5502 switch (alg) { 5503 case SADB_X_AALG_MD5: *min = *max = 16; break; 5504 case SADB_X_AALG_SHA: *min = *max = 20; break; 5505 case SADB_X_AALG_NULL: *min = 1; *max = 256; break; 5506 default: 5507 DPRINTF(("%s: unknown AH algorithm %u\n", 5508 __func__, alg)); 5509 break; 5510 } 5511 } 5512} 5513 5514/* 5515 * XXX reorder combinations by preference 5516 */ 5517static struct mbuf * 5518key_getcomb_ah() 5519{ 5520 struct sadb_comb *comb; 5521 struct auth_hash *algo; 5522 struct mbuf *m; 5523 u_int16_t minkeysize, maxkeysize; 5524 int i; 5525 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5526 5527 m = NULL; 5528 for (i = 1; i <= SADB_AALG_MAX; i++) { 5529#if 1 5530 /* we prefer HMAC algorithms, not old algorithms */ 5531 if (i != SADB_AALG_SHA1HMAC && i != SADB_AALG_MD5HMAC) 5532 continue; 5533#endif 5534 algo = ah_algorithm_lookup(i); 5535 if (!algo) 5536 continue; 5537 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5538 /* discard algorithms with key size smaller than system min */ 5539 if (_BITS(minkeysize) < ipsec_ah_keymin) 5540 continue; 5541 5542 if (!m) { 5543 IPSEC_ASSERT(l <= MLEN, 5544 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5545 MGET(m, M_DONTWAIT, MT_DATA); 5546 if (m) { 5547 M_ALIGN(m, l); 5548 m->m_len = l; 5549 m->m_next = NULL; 5550 } 5551 } else 5552 M_PREPEND(m, l, M_DONTWAIT); 5553 if (!m) 5554 return NULL; 5555 5556 comb = mtod(m, struct sadb_comb *); 5557 bzero(comb, sizeof(*comb)); 5558 key_getcomb_setlifetime(comb); 5559 comb->sadb_comb_auth = i; 5560 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5561 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5562 } 5563 5564 return m; 5565} 5566 5567/* 5568 * not really an official behavior. discussed in pf_key@inner.net in Sep2000. 5569 * XXX reorder combinations by preference 5570 */ 5571static struct mbuf * 5572key_getcomb_ipcomp() 5573{ 5574 struct sadb_comb *comb; 5575 struct comp_algo *algo; 5576 struct mbuf *m; 5577 int i; 5578 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5579 5580 m = NULL; 5581 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5582 algo = ipcomp_algorithm_lookup(i); 5583 if (!algo) 5584 continue; 5585 5586 if (!m) { 5587 IPSEC_ASSERT(l <= MLEN, 5588 ("l=%u > MLEN=%lu", l, (u_long) MLEN)); 5589 MGET(m, M_DONTWAIT, MT_DATA); 5590 if (m) { 5591 M_ALIGN(m, l); 5592 m->m_len = l; 5593 m->m_next = NULL; 5594 } 5595 } else 5596 M_PREPEND(m, l, M_DONTWAIT); 5597 if (!m) 5598 return NULL; 5599 5600 comb = mtod(m, struct sadb_comb *); 5601 bzero(comb, sizeof(*comb)); 5602 key_getcomb_setlifetime(comb); 5603 comb->sadb_comb_encrypt = i; 5604 /* what should we set into sadb_comb_*_{min,max}bits? */ 5605 } 5606 5607 return m; 5608} 5609 5610/* 5611 * XXX no way to pass mode (transport/tunnel) to userland 5612 * XXX replay checking? 5613 * XXX sysctl interface to ipsec_{ah,esp}_keymin 5614 */ 5615static struct mbuf * 5616key_getprop(saidx) 5617 const struct secasindex *saidx; 5618{ 5619 struct sadb_prop *prop; 5620 struct mbuf *m, *n; 5621 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 5622 int totlen; 5623 5624 switch (saidx->proto) { 5625 case IPPROTO_ESP: 5626 m = key_getcomb_esp(); 5627 break; 5628 case IPPROTO_AH: 5629 m = key_getcomb_ah(); 5630 break; 5631 case IPPROTO_IPCOMP: 5632 m = key_getcomb_ipcomp(); 5633 break; 5634 default: 5635 return NULL; 5636 } 5637 5638 if (!m) 5639 return NULL; 5640 M_PREPEND(m, l, M_DONTWAIT); 5641 if (!m) 5642 return NULL; 5643 5644 totlen = 0; 5645 for (n = m; n; n = n->m_next) 5646 totlen += n->m_len; 5647 5648 prop = mtod(m, struct sadb_prop *); 5649 bzero(prop, sizeof(*prop)); 5650 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 5651 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 5652 prop->sadb_prop_replay = 32; /* XXX */ 5653 5654 return m; 5655} 5656 5657/* 5658 * SADB_ACQUIRE processing called by key_checkrequest() and key_acquire2(). 5659 * send 5660 * <base, SA, address(SD), (address(P)), x_policy, 5661 * (identity(SD),) (sensitivity,) proposal> 5662 * to KMD, and expect to receive 5663 * <base> with SADB_ACQUIRE if error occured, 5664 * or 5665 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 5666 * from KMD by PF_KEY. 5667 * 5668 * XXX x_policy is outside of RFC2367 (KAME extension). 5669 * XXX sensitivity is not supported. 5670 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 5671 * see comment for key_getcomb_ipcomp(). 5672 * 5673 * OUT: 5674 * 0 : succeed 5675 * others: error number 5676 */ 5677static int 5678key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 5679{ 5680 struct mbuf *result = NULL, *m; 5681 struct secacq *newacq; 5682 u_int8_t satype; 5683 int error = -1; 5684 u_int32_t seq; 5685 5686 IPSEC_ASSERT(saidx != NULL, ("null saidx")); 5687 satype = key_proto2satype(saidx->proto); 5688 IPSEC_ASSERT(satype != 0, ("null satype, protocol %u", saidx->proto)); 5689 5690 /* 5691 * We never do anything about acquirng SA. There is anather 5692 * solution that kernel blocks to send SADB_ACQUIRE message until 5693 * getting something message from IKEd. In later case, to be 5694 * managed with ACQUIRING list. 5695 */ 5696 /* Get an entry to check whether sending message or not. */ 5697 if ((newacq = key_getacq(saidx)) != NULL) { 5698 if (key_blockacq_count < newacq->count) { 5699 /* reset counter and do send message. */ 5700 newacq->count = 0; 5701 } else { 5702 /* increment counter and do nothing. */ 5703 newacq->count++; 5704 return 0; 5705 } 5706 } else { 5707 /* make new entry for blocking to send SADB_ACQUIRE. */ 5708 if ((newacq = key_newacq(saidx)) == NULL) 5709 return ENOBUFS; 5710 } 5711 5712 5713 seq = newacq->seq; 5714 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 5715 if (!m) { 5716 error = ENOBUFS; 5717 goto fail; 5718 } 5719 result = m; 5720 5721 /* set sadb_address for saidx's. */ 5722 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 5723 &saidx->src.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5724 if (!m) { 5725 error = ENOBUFS; 5726 goto fail; 5727 } 5728 m_cat(result, m); 5729 5730 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 5731 &saidx->dst.sa, FULLMASK, IPSEC_ULPROTO_ANY); 5732 if (!m) { 5733 error = ENOBUFS; 5734 goto fail; 5735 } 5736 m_cat(result, m); 5737 5738 /* XXX proxy address (optional) */ 5739 5740 /* set sadb_x_policy */ 5741 if (sp) { 5742 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 5743 if (!m) { 5744 error = ENOBUFS; 5745 goto fail; 5746 } 5747 m_cat(result, m); 5748 } 5749 5750 /* XXX identity (optional) */ 5751#if 0 5752 if (idexttype && fqdn) { 5753 /* create identity extension (FQDN) */ 5754 struct sadb_ident *id; 5755 int fqdnlen; 5756 5757 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 5758 id = (struct sadb_ident *)p; 5759 bzero(id, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5760 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 5761 id->sadb_ident_exttype = idexttype; 5762 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 5763 bcopy(fqdn, id + 1, fqdnlen); 5764 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 5765 } 5766 5767 if (idexttype) { 5768 /* create identity extension (USERFQDN) */ 5769 struct sadb_ident *id; 5770 int userfqdnlen; 5771 5772 if (userfqdn) { 5773 /* +1 for terminating-NUL */ 5774 userfqdnlen = strlen(userfqdn) + 1; 5775 } else 5776 userfqdnlen = 0; 5777 id = (struct sadb_ident *)p; 5778 bzero(id, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5779 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 5780 id->sadb_ident_exttype = idexttype; 5781 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 5782 /* XXX is it correct? */ 5783 if (curproc && curproc->p_cred) 5784 id->sadb_ident_id = curproc->p_cred->p_ruid; 5785 if (userfqdn && userfqdnlen) 5786 bcopy(userfqdn, id + 1, userfqdnlen); 5787 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 5788 } 5789#endif 5790 5791 /* XXX sensitivity (optional) */ 5792 5793 /* create proposal/combination extension */ 5794 m = key_getprop(saidx); 5795#if 0 5796 /* 5797 * spec conformant: always attach proposal/combination extension, 5798 * the problem is that we have no way to attach it for ipcomp, 5799 * due to the way sadb_comb is declared in RFC2367. 5800 */ 5801 if (!m) { 5802 error = ENOBUFS; 5803 goto fail; 5804 } 5805 m_cat(result, m); 5806#else 5807 /* 5808 * outside of spec; make proposal/combination extension optional. 5809 */ 5810 if (m) 5811 m_cat(result, m); 5812#endif 5813 5814 if ((result->m_flags & M_PKTHDR) == 0) { 5815 error = EINVAL; 5816 goto fail; 5817 } 5818 5819 if (result->m_len < sizeof(struct sadb_msg)) { 5820 result = m_pullup(result, sizeof(struct sadb_msg)); 5821 if (result == NULL) { 5822 error = ENOBUFS; 5823 goto fail; 5824 } 5825 } 5826 5827 result->m_pkthdr.len = 0; 5828 for (m = result; m; m = m->m_next) 5829 result->m_pkthdr.len += m->m_len; 5830 5831 mtod(result, struct sadb_msg *)->sadb_msg_len = 5832 PFKEY_UNIT64(result->m_pkthdr.len); 5833 5834 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 5835 5836 fail: 5837 if (result) 5838 m_freem(result); 5839 return error; 5840} 5841 5842static struct secacq * 5843key_newacq(const struct secasindex *saidx) 5844{ 5845 struct secacq *newacq; 5846 5847 /* get new entry */ 5848 newacq = malloc(sizeof(struct secacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5849 if (newacq == NULL) { 5850 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5851 return NULL; 5852 } 5853 5854 /* copy secindex */ 5855 bcopy(saidx, &newacq->saidx, sizeof(newacq->saidx)); 5856 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq); 5857 newacq->created = time_second; 5858 newacq->count = 0; 5859 5860 /* add to acqtree */ 5861 ACQ_LOCK(); 5862 LIST_INSERT_HEAD(&acqtree, newacq, chain); 5863 ACQ_UNLOCK(); 5864 5865 return newacq; 5866} 5867 5868static struct secacq * 5869key_getacq(const struct secasindex *saidx) 5870{ 5871 struct secacq *acq; 5872 5873 ACQ_LOCK(); 5874 LIST_FOREACH(acq, &acqtree, chain) { 5875 if (key_cmpsaidx(saidx, &acq->saidx, CMP_EXACTLY)) 5876 break; 5877 } 5878 ACQ_UNLOCK(); 5879 5880 return acq; 5881} 5882 5883static struct secacq * 5884key_getacqbyseq(seq) 5885 u_int32_t seq; 5886{ 5887 struct secacq *acq; 5888 5889 ACQ_LOCK(); 5890 LIST_FOREACH(acq, &acqtree, chain) { 5891 if (acq->seq == seq) 5892 break; 5893 } 5894 ACQ_UNLOCK(); 5895 5896 return acq; 5897} 5898 5899static struct secspacq * 5900key_newspacq(spidx) 5901 struct secpolicyindex *spidx; 5902{ 5903 struct secspacq *acq; 5904 5905 /* get new entry */ 5906 acq = malloc(sizeof(struct secspacq), M_IPSEC_SAQ, M_NOWAIT|M_ZERO); 5907 if (acq == NULL) { 5908 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 5909 return NULL; 5910 } 5911 5912 /* copy secindex */ 5913 bcopy(spidx, &acq->spidx, sizeof(acq->spidx)); 5914 acq->created = time_second; 5915 acq->count = 0; 5916 5917 /* add to spacqtree */ 5918 SPACQ_LOCK(); 5919 LIST_INSERT_HEAD(&spacqtree, acq, chain); 5920 SPACQ_UNLOCK(); 5921 5922 return acq; 5923} 5924 5925static struct secspacq * 5926key_getspacq(spidx) 5927 struct secpolicyindex *spidx; 5928{ 5929 struct secspacq *acq; 5930 5931 SPACQ_LOCK(); 5932 LIST_FOREACH(acq, &spacqtree, chain) { 5933 if (key_cmpspidx_exactly(spidx, &acq->spidx)) { 5934 /* NB: return holding spacq_lock */ 5935 return acq; 5936 } 5937 } 5938 SPACQ_UNLOCK(); 5939 5940 return NULL; 5941} 5942 5943/* 5944 * SADB_ACQUIRE processing, 5945 * in first situation, is receiving 5946 * <base> 5947 * from the ikmpd, and clear sequence of its secasvar entry. 5948 * 5949 * In second situation, is receiving 5950 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5951 * from a user land process, and return 5952 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 5953 * to the socket. 5954 * 5955 * m will always be freed. 5956 */ 5957static int 5958key_acquire2(so, m, mhp) 5959 struct socket *so; 5960 struct mbuf *m; 5961 const struct sadb_msghdr *mhp; 5962{ 5963 const struct sadb_address *src0, *dst0; 5964 struct secasindex saidx; 5965 struct secashead *sah; 5966 u_int16_t proto; 5967 int error; 5968 5969 IPSEC_ASSERT(so != NULL, ("null socket")); 5970 IPSEC_ASSERT(m != NULL, ("null mbuf")); 5971 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 5972 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 5973 5974 /* 5975 * Error message from KMd. 5976 * We assume that if error was occured in IKEd, the length of PFKEY 5977 * message is equal to the size of sadb_msg structure. 5978 * We do not raise error even if error occured in this function. 5979 */ 5980 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 5981 struct secacq *acq; 5982 5983 /* check sequence number */ 5984 if (mhp->msg->sadb_msg_seq == 0) { 5985 ipseclog((LOG_DEBUG, "%s: must specify sequence " 5986 "number.\n", __func__)); 5987 m_freem(m); 5988 return 0; 5989 } 5990 5991 if ((acq = key_getacqbyseq(mhp->msg->sadb_msg_seq)) == NULL) { 5992 /* 5993 * the specified larval SA is already gone, or we got 5994 * a bogus sequence number. we can silently ignore it. 5995 */ 5996 m_freem(m); 5997 return 0; 5998 } 5999 6000 /* reset acq counter in order to deletion by timehander. */ 6001 acq->created = time_second; 6002 acq->count = 0; 6003 m_freem(m); 6004 return 0; 6005 } 6006 6007 /* 6008 * This message is from user land. 6009 */ 6010 6011 /* map satype to proto */ 6012 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6013 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6014 __func__)); 6015 return key_senderror(so, m, EINVAL); 6016 } 6017 6018 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6019 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6020 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6021 /* error */ 6022 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6023 __func__)); 6024 return key_senderror(so, m, EINVAL); 6025 } 6026 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6027 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6028 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6029 /* error */ 6030 ipseclog((LOG_DEBUG, "%s: invalid message is passed.\n", 6031 __func__)); 6032 return key_senderror(so, m, EINVAL); 6033 } 6034 6035 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 6036 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 6037 6038 /* XXX boundary check against sa_len */ 6039 KEY_SETSECASIDX(proto, IPSEC_MODE_ANY, 0, src0 + 1, dst0 + 1, &saidx); 6040 6041 /* get a SA index */ 6042 SAHTREE_LOCK(); 6043 LIST_FOREACH(sah, &sahtree, chain) { 6044 if (sah->state == SADB_SASTATE_DEAD) 6045 continue; 6046 if (key_cmpsaidx(&sah->saidx, &saidx, CMP_MODE_REQID)) 6047 break; 6048 } 6049 SAHTREE_UNLOCK(); 6050 if (sah != NULL) { 6051 ipseclog((LOG_DEBUG, "%s: a SA exists already.\n", __func__)); 6052 return key_senderror(so, m, EEXIST); 6053 } 6054 6055 error = key_acquire(&saidx, NULL); 6056 if (error != 0) { 6057 ipseclog((LOG_DEBUG, "%s: error %d returned from key_acquire\n", 6058 __func__, mhp->msg->sadb_msg_errno)); 6059 return key_senderror(so, m, error); 6060 } 6061 6062 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6063} 6064 6065/* 6066 * SADB_REGISTER processing. 6067 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6068 * receive 6069 * <base> 6070 * from the ikmpd, and register a socket to send PF_KEY messages, 6071 * and send 6072 * <base, supported> 6073 * to KMD by PF_KEY. 6074 * If socket is detached, must free from regnode. 6075 * 6076 * m will always be freed. 6077 */ 6078static int 6079key_register(so, m, mhp) 6080 struct socket *so; 6081 struct mbuf *m; 6082 const struct sadb_msghdr *mhp; 6083{ 6084 struct secreg *reg, *newreg = 0; 6085 6086 IPSEC_ASSERT(so != NULL, ("null socket")); 6087 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6088 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6089 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6090 6091 /* check for invalid register message */ 6092 if (mhp->msg->sadb_msg_satype >= sizeof(regtree)/sizeof(regtree[0])) 6093 return key_senderror(so, m, EINVAL); 6094 6095 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6096 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6097 goto setmsg; 6098 6099 /* check whether existing or not */ 6100 REGTREE_LOCK(); 6101 LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) { 6102 if (reg->so == so) { 6103 REGTREE_UNLOCK(); 6104 ipseclog((LOG_DEBUG, "%s: socket exists already.\n", 6105 __func__)); 6106 return key_senderror(so, m, EEXIST); 6107 } 6108 } 6109 6110 /* create regnode */ 6111 newreg = malloc(sizeof(struct secreg), M_IPSEC_SAR, M_NOWAIT|M_ZERO); 6112 if (newreg == NULL) { 6113 REGTREE_UNLOCK(); 6114 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6115 return key_senderror(so, m, ENOBUFS); 6116 } 6117 6118 newreg->so = so; 6119 ((struct keycb *)sotorawcb(so))->kp_registered++; 6120 6121 /* add regnode to regtree. */ 6122 LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain); 6123 REGTREE_UNLOCK(); 6124 6125 setmsg: 6126 { 6127 struct mbuf *n; 6128 struct sadb_msg *newmsg; 6129 struct sadb_supported *sup; 6130 u_int len, alen, elen; 6131 int off; 6132 int i; 6133 struct sadb_alg *alg; 6134 6135 /* create new sadb_msg to reply. */ 6136 alen = 0; 6137 for (i = 1; i <= SADB_AALG_MAX; i++) { 6138 if (ah_algorithm_lookup(i)) 6139 alen += sizeof(struct sadb_alg); 6140 } 6141 if (alen) 6142 alen += sizeof(struct sadb_supported); 6143 elen = 0; 6144 for (i = 1; i <= SADB_EALG_MAX; i++) { 6145 if (esp_algorithm_lookup(i)) 6146 elen += sizeof(struct sadb_alg); 6147 } 6148 if (elen) 6149 elen += sizeof(struct sadb_supported); 6150 6151 len = sizeof(struct sadb_msg) + alen + elen; 6152 6153 if (len > MCLBYTES) 6154 return key_senderror(so, m, ENOBUFS); 6155 6156 MGETHDR(n, M_DONTWAIT, MT_DATA); 6157 if (len > MHLEN) { 6158 MCLGET(n, M_DONTWAIT); 6159 if ((n->m_flags & M_EXT) == 0) { 6160 m_freem(n); 6161 n = NULL; 6162 } 6163 } 6164 if (!n) 6165 return key_senderror(so, m, ENOBUFS); 6166 6167 n->m_pkthdr.len = n->m_len = len; 6168 n->m_next = NULL; 6169 off = 0; 6170 6171 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, caddr_t) + off); 6172 newmsg = mtod(n, struct sadb_msg *); 6173 newmsg->sadb_msg_errno = 0; 6174 newmsg->sadb_msg_len = PFKEY_UNIT64(len); 6175 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6176 6177 /* for authentication algorithm */ 6178 if (alen) { 6179 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6180 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6181 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6182 off += PFKEY_ALIGN8(sizeof(*sup)); 6183 6184 for (i = 1; i <= SADB_AALG_MAX; i++) { 6185 struct auth_hash *aalgo; 6186 u_int16_t minkeysize, maxkeysize; 6187 6188 aalgo = ah_algorithm_lookup(i); 6189 if (!aalgo) 6190 continue; 6191 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6192 alg->sadb_alg_id = i; 6193 alg->sadb_alg_ivlen = 0; 6194 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6195 alg->sadb_alg_minbits = _BITS(minkeysize); 6196 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6197 off += PFKEY_ALIGN8(sizeof(*alg)); 6198 } 6199 } 6200 6201 /* for encryption algorithm */ 6202 if (elen) { 6203 sup = (struct sadb_supported *)(mtod(n, caddr_t) + off); 6204 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6205 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6206 off += PFKEY_ALIGN8(sizeof(*sup)); 6207 6208 for (i = 1; i <= SADB_EALG_MAX; i++) { 6209 struct enc_xform *ealgo; 6210 6211 ealgo = esp_algorithm_lookup(i); 6212 if (!ealgo) 6213 continue; 6214 alg = (struct sadb_alg *)(mtod(n, caddr_t) + off); 6215 alg->sadb_alg_id = i; 6216 alg->sadb_alg_ivlen = ealgo->blocksize; 6217 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6218 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6219 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6220 } 6221 } 6222 6223 IPSEC_ASSERT(off == len, 6224 ("length assumption failed (off %u len %u)", off, len)); 6225 6226 m_freem(m); 6227 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6228 } 6229} 6230 6231/* 6232 * free secreg entry registered. 6233 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6234 */ 6235void 6236key_freereg(struct socket *so) 6237{ 6238 struct secreg *reg; 6239 int i; 6240 6241 IPSEC_ASSERT(so != NULL, ("NULL so")); 6242 6243 /* 6244 * check whether existing or not. 6245 * check all type of SA, because there is a potential that 6246 * one socket is registered to multiple type of SA. 6247 */ 6248 REGTREE_LOCK(); 6249 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6250 LIST_FOREACH(reg, ®tree[i], chain) { 6251 if (reg->so == so && __LIST_CHAINED(reg)) { 6252 LIST_REMOVE(reg, chain); 6253 free(reg, M_IPSEC_SAR); 6254 break; 6255 } 6256 } 6257 } 6258 REGTREE_UNLOCK(); 6259} 6260 6261/* 6262 * SADB_EXPIRE processing 6263 * send 6264 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6265 * to KMD by PF_KEY. 6266 * NOTE: We send only soft lifetime extension. 6267 * 6268 * OUT: 0 : succeed 6269 * others : error number 6270 */ 6271static int 6272key_expire(struct secasvar *sav) 6273{ 6274 int s; 6275 int satype; 6276 struct mbuf *result = NULL, *m; 6277 int len; 6278 int error = -1; 6279 struct sadb_lifetime *lt; 6280 6281 /* XXX: Why do we lock ? */ 6282 s = splnet(); /*called from softclock()*/ 6283 6284 IPSEC_ASSERT (sav != NULL, ("null sav")); 6285 IPSEC_ASSERT (sav->sah != NULL, ("null sa header")); 6286 6287 /* set msg header */ 6288 satype = key_proto2satype(sav->sah->saidx.proto); 6289 IPSEC_ASSERT(satype != 0, ("invalid proto, satype %u", satype)); 6290 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6291 if (!m) { 6292 error = ENOBUFS; 6293 goto fail; 6294 } 6295 result = m; 6296 6297 /* create SA extension */ 6298 m = key_setsadbsa(sav); 6299 if (!m) { 6300 error = ENOBUFS; 6301 goto fail; 6302 } 6303 m_cat(result, m); 6304 6305 /* create SA extension */ 6306 m = key_setsadbxsa2(sav->sah->saidx.mode, 6307 sav->replay ? sav->replay->count : 0, 6308 sav->sah->saidx.reqid); 6309 if (!m) { 6310 error = ENOBUFS; 6311 goto fail; 6312 } 6313 m_cat(result, m); 6314 6315 /* create lifetime extension (current and soft) */ 6316 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6317 m = key_alloc_mbuf(len); 6318 if (!m || m->m_next) { /*XXX*/ 6319 if (m) 6320 m_freem(m); 6321 error = ENOBUFS; 6322 goto fail; 6323 } 6324 bzero(mtod(m, caddr_t), len); 6325 lt = mtod(m, struct sadb_lifetime *); 6326 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6327 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6328 lt->sadb_lifetime_allocations = sav->lft_c->allocations; 6329 lt->sadb_lifetime_bytes = sav->lft_c->bytes; 6330 lt->sadb_lifetime_addtime = sav->lft_c->addtime; 6331 lt->sadb_lifetime_usetime = sav->lft_c->usetime; 6332 lt = (struct sadb_lifetime *)(mtod(m, caddr_t) + len / 2); 6333 bcopy(sav->lft_s, lt, sizeof(*lt)); 6334 m_cat(result, m); 6335 6336 /* set sadb_address for source */ 6337 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 6338 &sav->sah->saidx.src.sa, 6339 FULLMASK, IPSEC_ULPROTO_ANY); 6340 if (!m) { 6341 error = ENOBUFS; 6342 goto fail; 6343 } 6344 m_cat(result, m); 6345 6346 /* set sadb_address for destination */ 6347 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 6348 &sav->sah->saidx.dst.sa, 6349 FULLMASK, IPSEC_ULPROTO_ANY); 6350 if (!m) { 6351 error = ENOBUFS; 6352 goto fail; 6353 } 6354 m_cat(result, m); 6355 6356 if ((result->m_flags & M_PKTHDR) == 0) { 6357 error = EINVAL; 6358 goto fail; 6359 } 6360 6361 if (result->m_len < sizeof(struct sadb_msg)) { 6362 result = m_pullup(result, sizeof(struct sadb_msg)); 6363 if (result == NULL) { 6364 error = ENOBUFS; 6365 goto fail; 6366 } 6367 } 6368 6369 result->m_pkthdr.len = 0; 6370 for (m = result; m; m = m->m_next) 6371 result->m_pkthdr.len += m->m_len; 6372 6373 mtod(result, struct sadb_msg *)->sadb_msg_len = 6374 PFKEY_UNIT64(result->m_pkthdr.len); 6375 6376 splx(s); 6377 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6378 6379 fail: 6380 if (result) 6381 m_freem(result); 6382 splx(s); 6383 return error; 6384} 6385 6386/* 6387 * SADB_FLUSH processing 6388 * receive 6389 * <base> 6390 * from the ikmpd, and free all entries in secastree. 6391 * and send, 6392 * <base> 6393 * to the ikmpd. 6394 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6395 * 6396 * m will always be freed. 6397 */ 6398static int 6399key_flush(so, m, mhp) 6400 struct socket *so; 6401 struct mbuf *m; 6402 const struct sadb_msghdr *mhp; 6403{ 6404 struct sadb_msg *newmsg; 6405 struct secashead *sah, *nextsah; 6406 struct secasvar *sav, *nextsav; 6407 u_int16_t proto; 6408 u_int8_t state; 6409 u_int stateidx; 6410 6411 IPSEC_ASSERT(so != NULL, ("null socket")); 6412 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6413 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6414 6415 /* map satype to proto */ 6416 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6417 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6418 __func__)); 6419 return key_senderror(so, m, EINVAL); 6420 } 6421 6422 /* no SATYPE specified, i.e. flushing all SA. */ 6423 SAHTREE_LOCK(); 6424 for (sah = LIST_FIRST(&sahtree); 6425 sah != NULL; 6426 sah = nextsah) { 6427 nextsah = LIST_NEXT(sah, chain); 6428 6429 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6430 && proto != sah->saidx.proto) 6431 continue; 6432 6433 for (stateidx = 0; 6434 stateidx < _ARRAYLEN(saorder_state_alive); 6435 stateidx++) { 6436 state = saorder_state_any[stateidx]; 6437 for (sav = LIST_FIRST(&sah->savtree[state]); 6438 sav != NULL; 6439 sav = nextsav) { 6440 6441 nextsav = LIST_NEXT(sav, chain); 6442 6443 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6444 KEY_FREESAV(&sav); 6445 } 6446 } 6447 6448 sah->state = SADB_SASTATE_DEAD; 6449 } 6450 SAHTREE_UNLOCK(); 6451 6452 if (m->m_len < sizeof(struct sadb_msg) || 6453 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6454 ipseclog((LOG_DEBUG, "%s: No more memory.\n", __func__)); 6455 return key_senderror(so, m, ENOBUFS); 6456 } 6457 6458 if (m->m_next) 6459 m_freem(m->m_next); 6460 m->m_next = NULL; 6461 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6462 newmsg = mtod(m, struct sadb_msg *); 6463 newmsg->sadb_msg_errno = 0; 6464 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6465 6466 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6467} 6468 6469/* 6470 * SADB_DUMP processing 6471 * dump all entries including status of DEAD in SAD. 6472 * receive 6473 * <base> 6474 * from the ikmpd, and dump all secasvar leaves 6475 * and send, 6476 * <base> ..... 6477 * to the ikmpd. 6478 * 6479 * m will always be freed. 6480 */ 6481static int 6482key_dump(so, m, mhp) 6483 struct socket *so; 6484 struct mbuf *m; 6485 const struct sadb_msghdr *mhp; 6486{ 6487 struct secashead *sah; 6488 struct secasvar *sav; 6489 u_int16_t proto; 6490 u_int stateidx; 6491 u_int8_t satype; 6492 u_int8_t state; 6493 int cnt; 6494 struct sadb_msg *newmsg; 6495 struct mbuf *n; 6496 6497 IPSEC_ASSERT(so != NULL, ("null socket")); 6498 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6499 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6500 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6501 6502 /* map satype to proto */ 6503 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 6504 ipseclog((LOG_DEBUG, "%s: invalid satype is passed.\n", 6505 __func__)); 6506 return key_senderror(so, m, EINVAL); 6507 } 6508 6509 /* count sav entries to be sent to the userland. */ 6510 cnt = 0; 6511 SAHTREE_LOCK(); 6512 LIST_FOREACH(sah, &sahtree, chain) { 6513 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6514 && proto != sah->saidx.proto) 6515 continue; 6516 6517 for (stateidx = 0; 6518 stateidx < _ARRAYLEN(saorder_state_any); 6519 stateidx++) { 6520 state = saorder_state_any[stateidx]; 6521 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6522 cnt++; 6523 } 6524 } 6525 } 6526 6527 if (cnt == 0) { 6528 SAHTREE_UNLOCK(); 6529 return key_senderror(so, m, ENOENT); 6530 } 6531 6532 /* send this to the userland, one at a time. */ 6533 newmsg = NULL; 6534 LIST_FOREACH(sah, &sahtree, chain) { 6535 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC 6536 && proto != sah->saidx.proto) 6537 continue; 6538 6539 /* map proto to satype */ 6540 if ((satype = key_proto2satype(sah->saidx.proto)) == 0) { 6541 SAHTREE_UNLOCK(); 6542 ipseclog((LOG_DEBUG, "%s: there was invalid proto in " 6543 "SAD.\n", __func__)); 6544 return key_senderror(so, m, EINVAL); 6545 } 6546 6547 for (stateidx = 0; 6548 stateidx < _ARRAYLEN(saorder_state_any); 6549 stateidx++) { 6550 state = saorder_state_any[stateidx]; 6551 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6552 n = key_setdumpsa(sav, SADB_DUMP, satype, 6553 --cnt, mhp->msg->sadb_msg_pid); 6554 if (!n) { 6555 SAHTREE_UNLOCK(); 6556 return key_senderror(so, m, ENOBUFS); 6557 } 6558 key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 6559 } 6560 } 6561 } 6562 SAHTREE_UNLOCK(); 6563 6564 m_freem(m); 6565 return 0; 6566} 6567 6568/* 6569 * SADB_X_PROMISC processing 6570 * 6571 * m will always be freed. 6572 */ 6573static int 6574key_promisc(so, m, mhp) 6575 struct socket *so; 6576 struct mbuf *m; 6577 const struct sadb_msghdr *mhp; 6578{ 6579 int olen; 6580 6581 IPSEC_ASSERT(so != NULL, ("null socket")); 6582 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6583 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6584 IPSEC_ASSERT(mhp->msg != NULL, ("null msg")); 6585 6586 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6587 6588 if (olen < sizeof(struct sadb_msg)) { 6589#if 1 6590 return key_senderror(so, m, EINVAL); 6591#else 6592 m_freem(m); 6593 return 0; 6594#endif 6595 } else if (olen == sizeof(struct sadb_msg)) { 6596 /* enable/disable promisc mode */ 6597 struct keycb *kp; 6598 6599 if ((kp = (struct keycb *)sotorawcb(so)) == NULL) 6600 return key_senderror(so, m, EINVAL); 6601 mhp->msg->sadb_msg_errno = 0; 6602 switch (mhp->msg->sadb_msg_satype) { 6603 case 0: 6604 case 1: 6605 kp->kp_promisc = mhp->msg->sadb_msg_satype; 6606 break; 6607 default: 6608 return key_senderror(so, m, EINVAL); 6609 } 6610 6611 /* send the original message back to everyone */ 6612 mhp->msg->sadb_msg_errno = 0; 6613 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6614 } else { 6615 /* send packet as is */ 6616 6617 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 6618 6619 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 6620 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6621 } 6622} 6623 6624static int (*key_typesw[]) __P((struct socket *, struct mbuf *, 6625 const struct sadb_msghdr *)) = { 6626 NULL, /* SADB_RESERVED */ 6627 key_getspi, /* SADB_GETSPI */ 6628 key_update, /* SADB_UPDATE */ 6629 key_add, /* SADB_ADD */ 6630 key_delete, /* SADB_DELETE */ 6631 key_get, /* SADB_GET */ 6632 key_acquire2, /* SADB_ACQUIRE */ 6633 key_register, /* SADB_REGISTER */ 6634 NULL, /* SADB_EXPIRE */ 6635 key_flush, /* SADB_FLUSH */ 6636 key_dump, /* SADB_DUMP */ 6637 key_promisc, /* SADB_X_PROMISC */ 6638 NULL, /* SADB_X_PCHANGE */ 6639 key_spdadd, /* SADB_X_SPDUPDATE */ 6640 key_spdadd, /* SADB_X_SPDADD */ 6641 key_spddelete, /* SADB_X_SPDDELETE */ 6642 key_spdget, /* SADB_X_SPDGET */ 6643 NULL, /* SADB_X_SPDACQUIRE */ 6644 key_spddump, /* SADB_X_SPDDUMP */ 6645 key_spdflush, /* SADB_X_SPDFLUSH */ 6646 key_spdadd, /* SADB_X_SPDSETIDX */ 6647 NULL, /* SADB_X_SPDEXPIRE */ 6648 key_spddelete2, /* SADB_X_SPDDELETE2 */ 6649}; 6650 6651/* 6652 * parse sadb_msg buffer to process PFKEYv2, 6653 * and create a data to response if needed. 6654 * I think to be dealed with mbuf directly. 6655 * IN: 6656 * msgp : pointer to pointer to a received buffer pulluped. 6657 * This is rewrited to response. 6658 * so : pointer to socket. 6659 * OUT: 6660 * length for buffer to send to user process. 6661 */ 6662int 6663key_parse(m, so) 6664 struct mbuf *m; 6665 struct socket *so; 6666{ 6667 struct sadb_msg *msg; 6668 struct sadb_msghdr mh; 6669 u_int orglen; 6670 int error; 6671 int target; 6672 6673 IPSEC_ASSERT(so != NULL, ("null socket")); 6674 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6675 6676#if 0 /*kdebug_sadb assumes msg in linear buffer*/ 6677 KEYDEBUG(KEYDEBUG_KEY_DUMP, 6678 ipseclog((LOG_DEBUG, "%s: passed sadb_msg\n", __func__)); 6679 kdebug_sadb(msg)); 6680#endif 6681 6682 if (m->m_len < sizeof(struct sadb_msg)) { 6683 m = m_pullup(m, sizeof(struct sadb_msg)); 6684 if (!m) 6685 return ENOBUFS; 6686 } 6687 msg = mtod(m, struct sadb_msg *); 6688 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 6689 target = KEY_SENDUP_ONE; 6690 6691 if ((m->m_flags & M_PKTHDR) == 0 || 6692 m->m_pkthdr.len != m->m_pkthdr.len) { 6693 ipseclog((LOG_DEBUG, "%s: invalid message length.\n",__func__)); 6694 pfkeystat.out_invlen++; 6695 error = EINVAL; 6696 goto senderror; 6697 } 6698 6699 if (msg->sadb_msg_version != PF_KEY_V2) { 6700 ipseclog((LOG_DEBUG, "%s: PF_KEY version %u is mismatched.\n", 6701 __func__, msg->sadb_msg_version)); 6702 pfkeystat.out_invver++; 6703 error = EINVAL; 6704 goto senderror; 6705 } 6706 6707 if (msg->sadb_msg_type > SADB_MAX) { 6708 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6709 __func__, msg->sadb_msg_type)); 6710 pfkeystat.out_invmsgtype++; 6711 error = EINVAL; 6712 goto senderror; 6713 } 6714 6715 /* for old-fashioned code - should be nuked */ 6716 if (m->m_pkthdr.len > MCLBYTES) { 6717 m_freem(m); 6718 return ENOBUFS; 6719 } 6720 if (m->m_next) { 6721 struct mbuf *n; 6722 6723 MGETHDR(n, M_DONTWAIT, MT_DATA); 6724 if (n && m->m_pkthdr.len > MHLEN) { 6725 MCLGET(n, M_DONTWAIT); 6726 if ((n->m_flags & M_EXT) == 0) { 6727 m_free(n); 6728 n = NULL; 6729 } 6730 } 6731 if (!n) { 6732 m_freem(m); 6733 return ENOBUFS; 6734 } 6735 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); 6736 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 6737 n->m_next = NULL; 6738 m_freem(m); 6739 m = n; 6740 } 6741 6742 /* align the mbuf chain so that extensions are in contiguous region. */ 6743 error = key_align(m, &mh); 6744 if (error) 6745 return error; 6746 6747 msg = mh.msg; 6748 6749 /* check SA type */ 6750 switch (msg->sadb_msg_satype) { 6751 case SADB_SATYPE_UNSPEC: 6752 switch (msg->sadb_msg_type) { 6753 case SADB_GETSPI: 6754 case SADB_UPDATE: 6755 case SADB_ADD: 6756 case SADB_DELETE: 6757 case SADB_GET: 6758 case SADB_ACQUIRE: 6759 case SADB_EXPIRE: 6760 ipseclog((LOG_DEBUG, "%s: must specify satype " 6761 "when msg type=%u.\n", __func__, 6762 msg->sadb_msg_type)); 6763 pfkeystat.out_invsatype++; 6764 error = EINVAL; 6765 goto senderror; 6766 } 6767 break; 6768 case SADB_SATYPE_AH: 6769 case SADB_SATYPE_ESP: 6770 case SADB_X_SATYPE_IPCOMP: 6771 case SADB_X_SATYPE_TCPSIGNATURE: 6772 switch (msg->sadb_msg_type) { 6773 case SADB_X_SPDADD: 6774 case SADB_X_SPDDELETE: 6775 case SADB_X_SPDGET: 6776 case SADB_X_SPDDUMP: 6777 case SADB_X_SPDFLUSH: 6778 case SADB_X_SPDSETIDX: 6779 case SADB_X_SPDUPDATE: 6780 case SADB_X_SPDDELETE2: 6781 ipseclog((LOG_DEBUG, "%s: illegal satype=%u\n", 6782 __func__, msg->sadb_msg_type)); 6783 pfkeystat.out_invsatype++; 6784 error = EINVAL; 6785 goto senderror; 6786 } 6787 break; 6788 case SADB_SATYPE_RSVP: 6789 case SADB_SATYPE_OSPFV2: 6790 case SADB_SATYPE_RIPV2: 6791 case SADB_SATYPE_MIP: 6792 ipseclog((LOG_DEBUG, "%s: type %u isn't supported.\n", 6793 __func__, msg->sadb_msg_satype)); 6794 pfkeystat.out_invsatype++; 6795 error = EOPNOTSUPP; 6796 goto senderror; 6797 case 1: /* XXX: What does it do? */ 6798 if (msg->sadb_msg_type == SADB_X_PROMISC) 6799 break; 6800 /*FALLTHROUGH*/ 6801 default: 6802 ipseclog((LOG_DEBUG, "%s: invalid type %u is passed.\n", 6803 __func__, msg->sadb_msg_satype)); 6804 pfkeystat.out_invsatype++; 6805 error = EINVAL; 6806 goto senderror; 6807 } 6808 6809 /* check field of upper layer protocol and address family */ 6810 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL 6811 && mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 6812 struct sadb_address *src0, *dst0; 6813 u_int plen; 6814 6815 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 6816 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 6817 6818 /* check upper layer protocol */ 6819 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 6820 ipseclog((LOG_DEBUG, "%s: upper layer protocol " 6821 "mismatched.\n", __func__)); 6822 pfkeystat.out_invaddr++; 6823 error = EINVAL; 6824 goto senderror; 6825 } 6826 6827 /* check family */ 6828 if (PFKEY_ADDR_SADDR(src0)->sa_family != 6829 PFKEY_ADDR_SADDR(dst0)->sa_family) { 6830 ipseclog((LOG_DEBUG, "%s: address family mismatched.\n", 6831 __func__)); 6832 pfkeystat.out_invaddr++; 6833 error = EINVAL; 6834 goto senderror; 6835 } 6836 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6837 PFKEY_ADDR_SADDR(dst0)->sa_len) { 6838 ipseclog((LOG_DEBUG, "%s: address struct size " 6839 "mismatched.\n", __func__)); 6840 pfkeystat.out_invaddr++; 6841 error = EINVAL; 6842 goto senderror; 6843 } 6844 6845 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6846 case AF_INET: 6847 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6848 sizeof(struct sockaddr_in)) { 6849 pfkeystat.out_invaddr++; 6850 error = EINVAL; 6851 goto senderror; 6852 } 6853 break; 6854 case AF_INET6: 6855 if (PFKEY_ADDR_SADDR(src0)->sa_len != 6856 sizeof(struct sockaddr_in6)) { 6857 pfkeystat.out_invaddr++; 6858 error = EINVAL; 6859 goto senderror; 6860 } 6861 break; 6862 default: 6863 ipseclog((LOG_DEBUG, "%s: unsupported address family\n", 6864 __func__)); 6865 pfkeystat.out_invaddr++; 6866 error = EAFNOSUPPORT; 6867 goto senderror; 6868 } 6869 6870 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 6871 case AF_INET: 6872 plen = sizeof(struct in_addr) << 3; 6873 break; 6874 case AF_INET6: 6875 plen = sizeof(struct in6_addr) << 3; 6876 break; 6877 default: 6878 plen = 0; /*fool gcc*/ 6879 break; 6880 } 6881 6882 /* check max prefix length */ 6883 if (src0->sadb_address_prefixlen > plen || 6884 dst0->sadb_address_prefixlen > plen) { 6885 ipseclog((LOG_DEBUG, "%s: illegal prefixlen.\n", 6886 __func__)); 6887 pfkeystat.out_invaddr++; 6888 error = EINVAL; 6889 goto senderror; 6890 } 6891 6892 /* 6893 * prefixlen == 0 is valid because there can be a case when 6894 * all addresses are matched. 6895 */ 6896 } 6897 6898 if (msg->sadb_msg_type >= sizeof(key_typesw)/sizeof(key_typesw[0]) || 6899 key_typesw[msg->sadb_msg_type] == NULL) { 6900 pfkeystat.out_invmsgtype++; 6901 error = EINVAL; 6902 goto senderror; 6903 } 6904 6905 return (*key_typesw[msg->sadb_msg_type])(so, m, &mh); 6906 6907senderror: 6908 msg->sadb_msg_errno = error; 6909 return key_sendup_mbuf(so, m, target); 6910} 6911 6912static int 6913key_senderror(so, m, code) 6914 struct socket *so; 6915 struct mbuf *m; 6916 int code; 6917{ 6918 struct sadb_msg *msg; 6919 6920 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6921 ("mbuf too small, len %u", m->m_len)); 6922 6923 msg = mtod(m, struct sadb_msg *); 6924 msg->sadb_msg_errno = code; 6925 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 6926} 6927 6928/* 6929 * set the pointer to each header into message buffer. 6930 * m will be freed on error. 6931 * XXX larger-than-MCLBYTES extension? 6932 */ 6933static int 6934key_align(m, mhp) 6935 struct mbuf *m; 6936 struct sadb_msghdr *mhp; 6937{ 6938 struct mbuf *n; 6939 struct sadb_ext *ext; 6940 size_t off, end; 6941 int extlen; 6942 int toff; 6943 6944 IPSEC_ASSERT(m != NULL, ("null mbuf")); 6945 IPSEC_ASSERT(mhp != NULL, ("null msghdr")); 6946 IPSEC_ASSERT(m->m_len >= sizeof(struct sadb_msg), 6947 ("mbuf too small, len %u", m->m_len)); 6948 6949 /* initialize */ 6950 bzero(mhp, sizeof(*mhp)); 6951 6952 mhp->msg = mtod(m, struct sadb_msg *); 6953 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 6954 6955 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 6956 extlen = end; /*just in case extlen is not updated*/ 6957 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 6958 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 6959 if (!n) { 6960 /* m is already freed */ 6961 return ENOBUFS; 6962 } 6963 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 6964 6965 /* set pointer */ 6966 switch (ext->sadb_ext_type) { 6967 case SADB_EXT_SA: 6968 case SADB_EXT_ADDRESS_SRC: 6969 case SADB_EXT_ADDRESS_DST: 6970 case SADB_EXT_ADDRESS_PROXY: 6971 case SADB_EXT_LIFETIME_CURRENT: 6972 case SADB_EXT_LIFETIME_HARD: 6973 case SADB_EXT_LIFETIME_SOFT: 6974 case SADB_EXT_KEY_AUTH: 6975 case SADB_EXT_KEY_ENCRYPT: 6976 case SADB_EXT_IDENTITY_SRC: 6977 case SADB_EXT_IDENTITY_DST: 6978 case SADB_EXT_SENSITIVITY: 6979 case SADB_EXT_PROPOSAL: 6980 case SADB_EXT_SUPPORTED_AUTH: 6981 case SADB_EXT_SUPPORTED_ENCRYPT: 6982 case SADB_EXT_SPIRANGE: 6983 case SADB_X_EXT_POLICY: 6984 case SADB_X_EXT_SA2: 6985 /* duplicate check */ 6986 /* 6987 * XXX Are there duplication payloads of either 6988 * KEY_AUTH or KEY_ENCRYPT ? 6989 */ 6990 if (mhp->ext[ext->sadb_ext_type] != NULL) { 6991 ipseclog((LOG_DEBUG, "%s: duplicate ext_type " 6992 "%u\n", __func__, ext->sadb_ext_type)); 6993 m_freem(m); 6994 pfkeystat.out_dupext++; 6995 return EINVAL; 6996 } 6997 break; 6998 default: 6999 ipseclog((LOG_DEBUG, "%s: invalid ext_type %u\n", 7000 __func__, ext->sadb_ext_type)); 7001 m_freem(m); 7002 pfkeystat.out_invexttype++; 7003 return EINVAL; 7004 } 7005 7006 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7007 7008 if (key_validate_ext(ext, extlen)) { 7009 m_freem(m); 7010 pfkeystat.out_invlen++; 7011 return EINVAL; 7012 } 7013 7014 n = m_pulldown(m, off, extlen, &toff); 7015 if (!n) { 7016 /* m is already freed */ 7017 return ENOBUFS; 7018 } 7019 ext = (struct sadb_ext *)(mtod(n, caddr_t) + toff); 7020 7021 mhp->ext[ext->sadb_ext_type] = ext; 7022 mhp->extoff[ext->sadb_ext_type] = off; 7023 mhp->extlen[ext->sadb_ext_type] = extlen; 7024 } 7025 7026 if (off != end) { 7027 m_freem(m); 7028 pfkeystat.out_invlen++; 7029 return EINVAL; 7030 } 7031 7032 return 0; 7033} 7034 7035static int 7036key_validate_ext(ext, len) 7037 const struct sadb_ext *ext; 7038 int len; 7039{ 7040 const struct sockaddr *sa; 7041 enum { NONE, ADDR } checktype = NONE; 7042 int baselen = 0; 7043 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7044 7045 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7046 return EINVAL; 7047 7048 /* if it does not match minimum/maximum length, bail */ 7049 if (ext->sadb_ext_type >= sizeof(minsize) / sizeof(minsize[0]) || 7050 ext->sadb_ext_type >= sizeof(maxsize) / sizeof(maxsize[0])) 7051 return EINVAL; 7052 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7053 return EINVAL; 7054 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7055 return EINVAL; 7056 7057 /* more checks based on sadb_ext_type XXX need more */ 7058 switch (ext->sadb_ext_type) { 7059 case SADB_EXT_ADDRESS_SRC: 7060 case SADB_EXT_ADDRESS_DST: 7061 case SADB_EXT_ADDRESS_PROXY: 7062 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7063 checktype = ADDR; 7064 break; 7065 case SADB_EXT_IDENTITY_SRC: 7066 case SADB_EXT_IDENTITY_DST: 7067 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7068 SADB_X_IDENTTYPE_ADDR) { 7069 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7070 checktype = ADDR; 7071 } else 7072 checktype = NONE; 7073 break; 7074 default: 7075 checktype = NONE; 7076 break; 7077 } 7078 7079 switch (checktype) { 7080 case NONE: 7081 break; 7082 case ADDR: 7083 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7084 if (len < baselen + sal) 7085 return EINVAL; 7086 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7087 return EINVAL; 7088 break; 7089 } 7090 7091 return 0; 7092} 7093 7094void 7095key_init() 7096{ 7097 int i; 7098 7099 SPTREE_LOCK_INIT(); 7100 REGTREE_LOCK_INIT(); 7101 SAHTREE_LOCK_INIT(); 7102 ACQ_LOCK_INIT(); 7103 SPACQ_LOCK_INIT(); 7104 7105 for (i = 0; i < IPSEC_DIR_MAX; i++) 7106 LIST_INIT(&sptree[i]); 7107 7108 LIST_INIT(&sahtree); 7109 7110 for (i = 0; i <= SADB_SATYPE_MAX; i++) 7111 LIST_INIT(®tree[i]); 7112 7113 LIST_INIT(&acqtree); 7114 LIST_INIT(&spacqtree); 7115 7116 /* system default */ 7117 ip4_def_policy.policy = IPSEC_POLICY_NONE; 7118 ip4_def_policy.refcnt++; /*never reclaim this*/ 7119 7120#ifndef IPSEC_DEBUG2 7121 timeout((void *)key_timehandler, (void *)0, hz); 7122#endif /*IPSEC_DEBUG2*/ 7123 7124 /* initialize key statistics */ 7125 keystat.getspi_count = 1; 7126 7127 printf("Fast IPsec: Initialized Security Association Processing.\n"); 7128 7129 return; 7130} 7131 7132/* 7133 * XXX: maybe This function is called after INBOUND IPsec processing. 7134 * 7135 * Special check for tunnel-mode packets. 7136 * We must make some checks for consistency between inner and outer IP header. 7137 * 7138 * xxx more checks to be provided 7139 */ 7140int 7141key_checktunnelsanity(sav, family, src, dst) 7142 struct secasvar *sav; 7143 u_int family; 7144 caddr_t src; 7145 caddr_t dst; 7146{ 7147 IPSEC_ASSERT(sav->sah != NULL, ("null SA header")); 7148 7149 /* XXX: check inner IP header */ 7150 7151 return 1; 7152} 7153 7154/* record data transfer on SA, and update timestamps */ 7155void 7156key_sa_recordxfer(sav, m) 7157 struct secasvar *sav; 7158 struct mbuf *m; 7159{ 7160 IPSEC_ASSERT(sav != NULL, ("Null secasvar")); 7161 IPSEC_ASSERT(m != NULL, ("Null mbuf")); 7162 if (!sav->lft_c) 7163 return; 7164 7165 /* 7166 * XXX Currently, there is a difference of bytes size 7167 * between inbound and outbound processing. 7168 */ 7169 sav->lft_c->bytes += m->m_pkthdr.len; 7170 /* to check bytes lifetime is done in key_timehandler(). */ 7171 7172 /* 7173 * We use the number of packets as the unit of 7174 * allocations. We increment the variable 7175 * whenever {esp,ah}_{in,out}put is called. 7176 */ 7177 sav->lft_c->allocations++; 7178 /* XXX check for expires? */ 7179 7180 /* 7181 * NOTE: We record CURRENT usetime by using wall clock, 7182 * in seconds. HARD and SOFT lifetime are measured by the time 7183 * difference (again in seconds) from usetime. 7184 * 7185 * usetime 7186 * v expire expire 7187 * -----+-----+--------+---> t 7188 * <--------------> HARD 7189 * <-----> SOFT 7190 */ 7191 sav->lft_c->usetime = time_second; 7192 /* XXX check for expires? */ 7193 7194 return; 7195} 7196 7197/* dumb version */ 7198void 7199key_sa_routechange(dst) 7200 struct sockaddr *dst; 7201{ 7202 struct secashead *sah; 7203 struct route *ro; 7204 7205 SAHTREE_LOCK(); 7206 LIST_FOREACH(sah, &sahtree, chain) { 7207 ro = &sah->sa_route; 7208 if (ro->ro_rt && dst->sa_len == ro->ro_dst.sa_len 7209 && bcmp(dst, &ro->ro_dst, dst->sa_len) == 0) { 7210 RTFREE(ro->ro_rt); 7211 ro->ro_rt = (struct rtentry *)NULL; 7212 } 7213 } 7214 SAHTREE_UNLOCK(); 7215} 7216 7217static void 7218key_sa_chgstate(sav, state) 7219 struct secasvar *sav; 7220 u_int8_t state; 7221{ 7222 IPSEC_ASSERT(sav != NULL, ("NULL sav")); 7223 SAHTREE_LOCK_ASSERT(); 7224 7225 if (sav->state != state) { 7226 if (__LIST_CHAINED(sav)) 7227 LIST_REMOVE(sav, chain); 7228 sav->state = state; 7229 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7230 } 7231} 7232 7233void 7234key_sa_stir_iv(sav) 7235 struct secasvar *sav; 7236{ 7237 7238 IPSEC_ASSERT(sav->iv != NULL, ("null IV")); 7239 key_randomfill(sav->iv, sav->ivlen); 7240} 7241 7242/* XXX too much? */ 7243static struct mbuf * 7244key_alloc_mbuf(l) 7245 int l; 7246{ 7247 struct mbuf *m = NULL, *n; 7248 int len, t; 7249 7250 len = l; 7251 while (len > 0) { 7252 MGET(n, M_DONTWAIT, MT_DATA); 7253 if (n && len > MLEN) 7254 MCLGET(n, M_DONTWAIT); 7255 if (!n) { 7256 m_freem(m); 7257 return NULL; 7258 } 7259 7260 n->m_next = NULL; 7261 n->m_len = 0; 7262 n->m_len = M_TRAILINGSPACE(n); 7263 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7264 if (n->m_len > len) { 7265 t = (n->m_len - len) & ~(sizeof(long) - 1); 7266 n->m_data += t; 7267 n->m_len = len; 7268 } 7269 7270 len -= n->m_len; 7271 7272 if (m) 7273 m_cat(m, n); 7274 else 7275 m = n; 7276 } 7277 7278 return m; 7279} 7280 7281/* 7282 * Take one of the kernel's security keys and convert it into a PF_KEY 7283 * structure within an mbuf, suitable for sending up to a waiting 7284 * application in user land. 7285 * 7286 * IN: 7287 * src: A pointer to a kernel security key. 7288 * exttype: Which type of key this is. Refer to the PF_KEY data structures. 7289 * OUT: 7290 * a valid mbuf or NULL indicating an error 7291 * 7292 */ 7293 7294static struct mbuf * 7295key_setkey(struct seckey *src, u_int16_t exttype) 7296{ 7297 struct mbuf *m; 7298 struct sadb_key *p; 7299 int len; 7300 7301 if (src == NULL) 7302 return NULL; 7303 7304 len = PFKEY_ALIGN8(sizeof(struct sadb_key) + _KEYLEN(src)); 7305 7306 m = key_alloc_mbuf(len); 7307 if (m == NULL) 7308 return NULL; 7309 p = mtod(m, struct sadb_key *); 7310 bzero(p, len); 7311 p->sadb_key_len = PFKEY_UNIT64(len); 7312 p->sadb_key_exttype = exttype; 7313 p->sadb_key_bits = src->bits; 7314 bcopy(src->key_data, _KEYBUF(p), _KEYLEN(src)); 7315 7316 return m; 7317} 7318 7319/* 7320 * Take one of the kernel's lifetime data structures and convert it 7321 * into a PF_KEY structure within an mbuf, suitable for sending up to 7322 * a waiting application in user land. 7323 * 7324 * IN: 7325 * src: A pointer to a kernel lifetime structure. 7326 * exttype: Which type of lifetime this is. Refer to the PF_KEY 7327 * data structures for more information. 7328 * OUT: 7329 * a valid mbuf or NULL indicating an error 7330 * 7331 */ 7332 7333static struct mbuf * 7334key_setlifetime(struct seclifetime *src, u_int16_t exttype) 7335{ 7336 struct mbuf *m = NULL; 7337 struct sadb_lifetime *p; 7338 int len = PFKEY_ALIGN8(sizeof(struct sadb_lifetime)); 7339 7340 if (src == NULL) 7341 return NULL; 7342 7343 m = key_alloc_mbuf(len); 7344 if (m == NULL) 7345 return m; 7346 p = mtod(m, struct sadb_lifetime *); 7347 7348 bzero(p, len); 7349 p->sadb_lifetime_len = PFKEY_UNIT64(len); 7350 p->sadb_lifetime_exttype = exttype; 7351 p->sadb_lifetime_allocations = src->allocations; 7352 p->sadb_lifetime_bytes = src->bytes; 7353 p->sadb_lifetime_addtime = src->addtime; 7354 p->sadb_lifetime_usetime = src->usetime; 7355 7356 return m; 7357 7358} 7359