key.c revision 1.195
1 /* $NetBSD: key.c,v 1.195 2017/07/27 06:59:28 ozaki-r Exp $ */ 2 /* $FreeBSD: src/sys/netipsec/key.c,v 1.3.2.3 2004/02/14 22:23:23 bms Exp $ */ 3 /* $KAME: key.c,v 1.191 2001/06/27 10:46:49 sakane Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: key.c,v 1.195 2017/07/27 06:59:28 ozaki-r Exp $"); 36 37 /* 38 * This code is referd to RFC 2367 39 */ 40 41 #if defined(_KERNEL_OPT) 42 #include "opt_inet.h" 43 #include "opt_ipsec.h" 44 #include "opt_gateway.h" 45 #endif 46 47 #include <sys/types.h> 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/callout.h> 51 #include <sys/kernel.h> 52 #include <sys/mbuf.h> 53 #include <sys/domain.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/sysctl.h> 57 #include <sys/errno.h> 58 #include <sys/proc.h> 59 #include <sys/queue.h> 60 #include <sys/syslog.h> 61 #include <sys/once.h> 62 #include <sys/cprng.h> 63 #include <sys/psref.h> 64 #include <sys/lwp.h> 65 #include <sys/workqueue.h> 66 #include <sys/kmem.h> 67 #include <sys/cpu.h> 68 #include <sys/atomic.h> 69 #include <sys/pslist.h> 70 71 #include <net/if.h> 72 #include <net/route.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/ip.h> 77 #include <netinet/in_var.h> 78 #ifdef INET 79 #include <netinet/ip_var.h> 80 #endif 81 82 #ifdef INET6 83 #include <netinet/ip6.h> 84 #include <netinet6/in6_var.h> 85 #include <netinet6/ip6_var.h> 86 #endif /* INET6 */ 87 88 #ifdef INET 89 #include <netinet/in_pcb.h> 90 #endif 91 #ifdef INET6 92 #include <netinet6/in6_pcb.h> 93 #endif /* INET6 */ 94 95 #include <net/pfkeyv2.h> 96 #include <netipsec/keydb.h> 97 #include <netipsec/key.h> 98 #include <netipsec/keysock.h> 99 #include <netipsec/key_debug.h> 100 101 #include <netipsec/ipsec.h> 102 #ifdef INET6 103 #include <netipsec/ipsec6.h> 104 #endif 105 #include <netipsec/ipsec_private.h> 106 107 #include <netipsec/xform.h> 108 #include <netipsec/ipcomp.h> 109 110 111 #include <net/net_osdep.h> 112 113 #define FULLMASK 0xff 114 #define _BITS(bytes) ((bytes) << 3) 115 116 #define PORT_NONE 0 117 #define PORT_LOOSE 1 118 #define PORT_STRICT 2 119 120 percpu_t *pfkeystat_percpu; 121 122 /* 123 * Note on SA reference counting: 124 * - SAs that are not in DEAD state will have (total external reference + 1) 125 * following value in reference count field. they cannot be freed and are 126 * referenced from SA header. 127 * - SAs that are in DEAD state will have (total external reference) 128 * in reference count field. they are ready to be freed. reference from 129 * SA header will be removed in key_delsav(), when the reference count 130 * field hits 0 (= no external reference other than from SA header. 131 */ 132 133 u_int32_t key_debug_level = 0; 134 static u_int key_spi_trycnt = 1000; 135 static u_int32_t key_spi_minval = 0x100; 136 static u_int32_t key_spi_maxval = 0x0fffffff; /* XXX */ 137 static u_int32_t policy_id = 0; 138 static u_int key_int_random = 60; /*interval to initialize randseed,1(m)*/ 139 static u_int key_larval_lifetime = 30; /* interval to expire acquiring, 30(s)*/ 140 static int key_blockacq_count = 10; /* counter for blocking SADB_ACQUIRE.*/ 141 static int key_blockacq_lifetime = 20; /* lifetime for blocking SADB_ACQUIRE.*/ 142 static int key_prefered_oldsa = 0; /* prefered old sa rather than new sa.*/ 143 144 static u_int32_t acq_seq = 0; 145 146 static struct pslist_head sptree[IPSEC_DIR_MAX]; /* SPD */ 147 static LIST_HEAD(_sahtree, secashead) sahtree; /* SAD */ 148 static LIST_HEAD(_regtree, secreg) regtree[SADB_SATYPE_MAX + 1]; 149 /* registed list */ 150 #ifndef IPSEC_NONBLOCK_ACQUIRE 151 static LIST_HEAD(_acqtree, secacq) acqtree; /* acquiring list */ 152 #endif 153 #ifdef notyet 154 static LIST_HEAD(_spacqtree, secspacq) spacqtree; /* SP acquiring list */ 155 #endif 156 157 #define SPLIST_ENTRY_INIT(sp) \ 158 PSLIST_ENTRY_INIT((sp), pslist_entry) 159 #define SPLIST_ENTRY_DESTROY(sp) \ 160 PSLIST_ENTRY_DESTROY((sp), pslist_entry) 161 #define SPLIST_WRITER_REMOVE(sp) \ 162 PSLIST_WRITER_REMOVE((sp), pslist_entry) 163 #define SPLIST_READER_EMPTY(dir) \ 164 (PSLIST_READER_FIRST(&sptree[(dir)], struct secpolicy, \ 165 pslist_entry) == NULL) 166 #define SPLIST_READER_FOREACH(sp, dir) \ 167 PSLIST_READER_FOREACH((sp), &sptree[(dir)], struct secpolicy, \ 168 pslist_entry) 169 #define SPLIST_WRITER_FOREACH(sp, dir) \ 170 PSLIST_WRITER_FOREACH((sp), &sptree[(dir)], struct secpolicy, \ 171 pslist_entry) 172 #define SPLIST_WRITER_INSERT_AFTER(sp, new) \ 173 PSLIST_WRITER_INSERT_AFTER((sp), (new), pslist_entry) 174 #define SPLIST_WRITER_EMPTY(dir) \ 175 (PSLIST_WRITER_FIRST(&sptree[(dir)], struct secpolicy, \ 176 pslist_entry) == NULL) 177 #define SPLIST_WRITER_INSERT_HEAD(dir, sp) \ 178 PSLIST_WRITER_INSERT_HEAD(&sptree[(dir)], (sp), pslist_entry) 179 #define SPLIST_WRITER_NEXT(sp) \ 180 PSLIST_WRITER_NEXT((sp), struct secpolicy, pslist_entry) 181 #define SPLIST_WRITER_INSERT_TAIL(dir, new) \ 182 do { \ 183 if (SPLIST_WRITER_EMPTY((dir))) { \ 184 SPLIST_WRITER_INSERT_HEAD((dir), (new)); \ 185 } else { \ 186 struct secpolicy *__sp; \ 187 SPLIST_WRITER_FOREACH(__sp, (dir)) { \ 188 if (SPLIST_WRITER_NEXT(__sp) == NULL) { \ 189 SPLIST_WRITER_INSERT_AFTER(__sp,\ 190 (new)); \ 191 break; \ 192 } \ 193 } \ 194 } \ 195 } while (0) 196 197 /* 198 * Protect regtree, acqtree and items stored in the lists. 199 */ 200 static kmutex_t key_mtx __cacheline_aligned; 201 202 /* search order for SAs */ 203 /* 204 * This order is important because we must select the oldest SA 205 * for outbound processing. For inbound, This is not important. 206 */ 207 static const u_int saorder_state_valid_prefer_old[] = { 208 SADB_SASTATE_DYING, SADB_SASTATE_MATURE, 209 }; 210 static const u_int saorder_state_valid_prefer_new[] = { 211 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 212 }; 213 214 static const u_int saorder_state_alive[] = { 215 /* except DEAD */ 216 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, SADB_SASTATE_LARVAL 217 }; 218 static const u_int saorder_state_any[] = { 219 SADB_SASTATE_MATURE, SADB_SASTATE_DYING, 220 SADB_SASTATE_LARVAL, SADB_SASTATE_DEAD 221 }; 222 223 #define SASTATE_ALIVE_FOREACH(s) \ 224 for (int _i = 0; \ 225 _i < __arraycount(saorder_state_alive) ? \ 226 (s) = saorder_state_alive[_i], true : false; \ 227 _i++) 228 #define SASTATE_ANY_FOREACH(s) \ 229 for (int _i = 0; \ 230 _i < __arraycount(saorder_state_any) ? \ 231 (s) = saorder_state_any[_i], true : false; \ 232 _i++) 233 234 static const int minsize[] = { 235 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 236 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 237 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 238 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 239 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 240 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_SRC */ 241 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_DST */ 242 sizeof(struct sadb_address), /* SADB_EXT_ADDRESS_PROXY */ 243 sizeof(struct sadb_key), /* SADB_EXT_KEY_AUTH */ 244 sizeof(struct sadb_key), /* SADB_EXT_KEY_ENCRYPT */ 245 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_SRC */ 246 sizeof(struct sadb_ident), /* SADB_EXT_IDENTITY_DST */ 247 sizeof(struct sadb_sens), /* SADB_EXT_SENSITIVITY */ 248 sizeof(struct sadb_prop), /* SADB_EXT_PROPOSAL */ 249 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_AUTH */ 250 sizeof(struct sadb_supported), /* SADB_EXT_SUPPORTED_ENCRYPT */ 251 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 252 0, /* SADB_X_EXT_KMPRIVATE */ 253 sizeof(struct sadb_x_policy), /* SADB_X_EXT_POLICY */ 254 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 255 sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */ 256 sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */ 257 sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */ 258 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAI */ 259 sizeof(struct sadb_address), /* SADB_X_EXT_NAT_T_OAR */ 260 sizeof(struct sadb_x_nat_t_frag), /* SADB_X_EXT_NAT_T_FRAG */ 261 }; 262 static const int maxsize[] = { 263 sizeof(struct sadb_msg), /* SADB_EXT_RESERVED */ 264 sizeof(struct sadb_sa), /* SADB_EXT_SA */ 265 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_CURRENT */ 266 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_HARD */ 267 sizeof(struct sadb_lifetime), /* SADB_EXT_LIFETIME_SOFT */ 268 0, /* SADB_EXT_ADDRESS_SRC */ 269 0, /* SADB_EXT_ADDRESS_DST */ 270 0, /* SADB_EXT_ADDRESS_PROXY */ 271 0, /* SADB_EXT_KEY_AUTH */ 272 0, /* SADB_EXT_KEY_ENCRYPT */ 273 0, /* SADB_EXT_IDENTITY_SRC */ 274 0, /* SADB_EXT_IDENTITY_DST */ 275 0, /* SADB_EXT_SENSITIVITY */ 276 0, /* SADB_EXT_PROPOSAL */ 277 0, /* SADB_EXT_SUPPORTED_AUTH */ 278 0, /* SADB_EXT_SUPPORTED_ENCRYPT */ 279 sizeof(struct sadb_spirange), /* SADB_EXT_SPIRANGE */ 280 0, /* SADB_X_EXT_KMPRIVATE */ 281 0, /* SADB_X_EXT_POLICY */ 282 sizeof(struct sadb_x_sa2), /* SADB_X_SA2 */ 283 sizeof(struct sadb_x_nat_t_type), /* SADB_X_EXT_NAT_T_TYPE */ 284 sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_SPORT */ 285 sizeof(struct sadb_x_nat_t_port), /* SADB_X_EXT_NAT_T_DPORT */ 286 0, /* SADB_X_EXT_NAT_T_OAI */ 287 0, /* SADB_X_EXT_NAT_T_OAR */ 288 sizeof(struct sadb_x_nat_t_frag), /* SADB_X_EXT_NAT_T_FRAG */ 289 }; 290 291 static int ipsec_esp_keymin = 256; 292 static int ipsec_esp_auth = 0; 293 static int ipsec_ah_keymin = 128; 294 295 #ifdef SYSCTL_DECL 296 SYSCTL_DECL(_net_key); 297 #endif 298 299 #ifdef SYSCTL_INT 300 SYSCTL_INT(_net_key, KEYCTL_DEBUG_LEVEL, debug, CTLFLAG_RW, \ 301 &key_debug_level, 0, ""); 302 303 /* max count of trial for the decision of spi value */ 304 SYSCTL_INT(_net_key, KEYCTL_SPI_TRY, spi_trycnt, CTLFLAG_RW, \ 305 &key_spi_trycnt, 0, ""); 306 307 /* minimum spi value to allocate automatically. */ 308 SYSCTL_INT(_net_key, KEYCTL_SPI_MIN_VALUE, spi_minval, CTLFLAG_RW, \ 309 &key_spi_minval, 0, ""); 310 311 /* maximun spi value to allocate automatically. */ 312 SYSCTL_INT(_net_key, KEYCTL_SPI_MAX_VALUE, spi_maxval, CTLFLAG_RW, \ 313 &key_spi_maxval, 0, ""); 314 315 /* interval to initialize randseed */ 316 SYSCTL_INT(_net_key, KEYCTL_RANDOM_INT, int_random, CTLFLAG_RW, \ 317 &key_int_random, 0, ""); 318 319 /* lifetime for larval SA */ 320 SYSCTL_INT(_net_key, KEYCTL_LARVAL_LIFETIME, larval_lifetime, CTLFLAG_RW, \ 321 &key_larval_lifetime, 0, ""); 322 323 /* counter for blocking to send SADB_ACQUIRE to IKEd */ 324 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_COUNT, blockacq_count, CTLFLAG_RW, \ 325 &key_blockacq_count, 0, ""); 326 327 /* lifetime for blocking to send SADB_ACQUIRE to IKEd */ 328 SYSCTL_INT(_net_key, KEYCTL_BLOCKACQ_LIFETIME, blockacq_lifetime, CTLFLAG_RW, \ 329 &key_blockacq_lifetime, 0, ""); 330 331 /* ESP auth */ 332 SYSCTL_INT(_net_key, KEYCTL_ESP_AUTH, esp_auth, CTLFLAG_RW, \ 333 &ipsec_esp_auth, 0, ""); 334 335 /* minimum ESP key length */ 336 SYSCTL_INT(_net_key, KEYCTL_ESP_KEYMIN, esp_keymin, CTLFLAG_RW, \ 337 &ipsec_esp_keymin, 0, ""); 338 339 /* minimum AH key length */ 340 SYSCTL_INT(_net_key, KEYCTL_AH_KEYMIN, ah_keymin, CTLFLAG_RW, \ 341 &ipsec_ah_keymin, 0, ""); 342 343 /* perfered old SA rather than new SA */ 344 SYSCTL_INT(_net_key, KEYCTL_PREFERED_OLDSA, prefered_oldsa, CTLFLAG_RW,\ 345 &key_prefered_oldsa, 0, ""); 346 #endif /* SYSCTL_INT */ 347 348 #define __LIST_CHAINED(elm) \ 349 (!((elm)->chain.le_next == NULL && (elm)->chain.le_prev == NULL)) 350 #define LIST_INSERT_TAIL(head, elm, type, field) \ 351 do {\ 352 struct type *curelm = LIST_FIRST(head); \ 353 if (curelm == NULL) {\ 354 LIST_INSERT_HEAD(head, elm, field); \ 355 } else { \ 356 while (LIST_NEXT(curelm, field)) \ 357 curelm = LIST_NEXT(curelm, field);\ 358 LIST_INSERT_AFTER(curelm, elm, field);\ 359 }\ 360 } while (0) 361 362 #define KEY_CHKSASTATE(head, sav) \ 363 /* do */ { \ 364 if ((head) != (sav)) { \ 365 IPSECLOG(LOG_DEBUG, \ 366 "state mismatched (TREE=%d SA=%d)\n", \ 367 (head), (sav)); \ 368 continue; \ 369 } \ 370 } /* while (0) */ 371 372 #define KEY_CHKSPDIR(head, sp) \ 373 do { \ 374 if ((head) != (sp)) { \ 375 IPSECLOG(LOG_DEBUG, \ 376 "direction mismatched (TREE=%d SP=%d), anyway continue.\n",\ 377 (head), (sp)); \ 378 } \ 379 } while (0) 380 381 /* 382 * set parameters into secasindex buffer. 383 * Must allocate secasindex buffer before calling this function. 384 */ 385 static int 386 key_setsecasidx(int, int, int, const struct sockaddr *, 387 const struct sockaddr *, struct secasindex *); 388 389 /* key statistics */ 390 struct _keystat { 391 u_long getspi_count; /* the avarage of count to try to get new SPI */ 392 } keystat; 393 394 struct sadb_msghdr { 395 struct sadb_msg *msg; 396 struct sadb_ext *ext[SADB_EXT_MAX + 1]; 397 int extoff[SADB_EXT_MAX + 1]; 398 int extlen[SADB_EXT_MAX + 1]; 399 }; 400 401 static void 402 key_init_spidx_bymsghdr(struct secpolicyindex *, const struct sadb_msghdr *); 403 404 static const struct sockaddr * 405 key_msghdr_get_sockaddr(const struct sadb_msghdr *mhp, int idx) 406 { 407 408 return PFKEY_ADDR_SADDR((struct sadb_address *)mhp->ext[idx]); 409 } 410 411 static struct mbuf * 412 key_fill_replymsg(struct mbuf *m, int seq) 413 { 414 struct sadb_msg *msg; 415 416 if (m->m_len < sizeof(*msg)) { 417 m = m_pullup(m, sizeof(*msg)); 418 if (m == NULL) 419 return NULL; 420 } 421 msg = mtod(m, struct sadb_msg *); 422 msg->sadb_msg_errno = 0; 423 msg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 424 if (seq != 0) 425 msg->sadb_msg_seq = seq; 426 427 return m; 428 } 429 430 static struct secasvar *key_lookup_sa_bysaidx(const struct secasindex *); 431 #if 0 432 static void key_freeso(struct socket *); 433 static void key_freesp_so(struct secpolicy **); 434 #endif 435 static void key_delsp (struct secpolicy *); 436 static struct secpolicy *key_getsp (const struct secpolicyindex *); 437 static struct secpolicy *key_getspbyid (u_int32_t); 438 static u_int16_t key_newreqid (void); 439 static struct mbuf *key_gather_mbuf (struct mbuf *, 440 const struct sadb_msghdr *, int, int, ...); 441 static int key_api_spdadd(struct socket *, struct mbuf *, 442 const struct sadb_msghdr *); 443 static u_int32_t key_getnewspid (void); 444 static int key_api_spddelete(struct socket *, struct mbuf *, 445 const struct sadb_msghdr *); 446 static int key_api_spddelete2(struct socket *, struct mbuf *, 447 const struct sadb_msghdr *); 448 static int key_api_spdget(struct socket *, struct mbuf *, 449 const struct sadb_msghdr *); 450 static int key_api_spdflush(struct socket *, struct mbuf *, 451 const struct sadb_msghdr *); 452 static int key_api_spddump(struct socket *, struct mbuf *, 453 const struct sadb_msghdr *); 454 static struct mbuf * key_setspddump (int *errorp, pid_t); 455 static struct mbuf * key_setspddump_chain (int *errorp, int *lenp, pid_t pid); 456 static int key_api_nat_map(struct socket *, struct mbuf *, 457 const struct sadb_msghdr *); 458 static struct mbuf *key_setdumpsp (struct secpolicy *, 459 u_int8_t, u_int32_t, pid_t); 460 static u_int key_getspreqmsglen (const struct secpolicy *); 461 static int key_spdexpire (struct secpolicy *); 462 static struct secashead *key_newsah (const struct secasindex *); 463 static void key_delsah (struct secashead *); 464 static struct secasvar *key_newsav(struct mbuf *, 465 const struct sadb_msghdr *, int *, const char*, int); 466 #define KEY_NEWSAV(m, sadb, e) \ 467 key_newsav(m, sadb, e, __func__, __LINE__) 468 static void key_delsav (struct secasvar *); 469 static struct secashead *key_getsah(const struct secasindex *, int); 470 static bool key_checkspidup(const struct secasindex *, u_int32_t); 471 static struct secasvar *key_getsavbyspi (struct secashead *, u_int32_t); 472 static int key_setsaval (struct secasvar *, struct mbuf *, 473 const struct sadb_msghdr *); 474 static void key_freesaval(struct secasvar *); 475 static int key_init_xform(struct secasvar *); 476 static void key_clear_xform(struct secasvar *); 477 static struct mbuf *key_setdumpsa (struct secasvar *, u_int8_t, 478 u_int8_t, u_int32_t, u_int32_t); 479 static struct mbuf *key_setsadbxport (u_int16_t, u_int16_t); 480 static struct mbuf *key_setsadbxtype (u_int16_t); 481 static struct mbuf *key_setsadbxfrag (u_int16_t); 482 static void key_porttosaddr (union sockaddr_union *, u_int16_t); 483 static int key_checksalen (const union sockaddr_union *); 484 static struct mbuf *key_setsadbmsg (u_int8_t, u_int16_t, u_int8_t, 485 u_int32_t, pid_t, u_int16_t); 486 static struct mbuf *key_setsadbsa (struct secasvar *); 487 static struct mbuf *key_setsadbaddr (u_int16_t, 488 const struct sockaddr *, u_int8_t, u_int16_t); 489 #if 0 490 static struct mbuf *key_setsadbident (u_int16_t, u_int16_t, void *, 491 int, u_int64_t); 492 #endif 493 static struct mbuf *key_setsadbxsa2 (u_int8_t, u_int32_t, u_int16_t); 494 static struct mbuf *key_setsadbxpolicy (u_int16_t, u_int8_t, 495 u_int32_t); 496 static void *key_newbuf (const void *, u_int); 497 #ifdef INET6 498 static int key_ismyaddr6 (const struct sockaddr_in6 *); 499 #endif 500 501 static void sysctl_net_keyv2_setup(struct sysctllog **); 502 static void sysctl_net_key_compat_setup(struct sysctllog **); 503 504 /* flags for key_saidx_match() */ 505 #define CMP_HEAD 1 /* protocol, addresses. */ 506 #define CMP_MODE_REQID 2 /* additionally HEAD, reqid, mode. */ 507 #define CMP_REQID 3 /* additionally HEAD, reaid. */ 508 #define CMP_EXACTLY 4 /* all elements. */ 509 static int key_saidx_match(const struct secasindex *, 510 const struct secasindex *, int); 511 512 static int key_sockaddr_match(const struct sockaddr *, 513 const struct sockaddr *, int); 514 static int key_bb_match_withmask(const void *, const void *, u_int); 515 static u_int16_t key_satype2proto (u_int8_t); 516 static u_int8_t key_proto2satype (u_int16_t); 517 518 static int key_spidx_match_exactly(const struct secpolicyindex *, 519 const struct secpolicyindex *); 520 static int key_spidx_match_withmask(const struct secpolicyindex *, 521 const struct secpolicyindex *); 522 523 static int key_api_getspi(struct socket *, struct mbuf *, 524 const struct sadb_msghdr *); 525 static u_int32_t key_do_getnewspi (const struct sadb_spirange *, 526 const struct secasindex *); 527 static int key_handle_natt_info (struct secasvar *, 528 const struct sadb_msghdr *); 529 static int key_set_natt_ports (union sockaddr_union *, 530 union sockaddr_union *, 531 const struct sadb_msghdr *); 532 static int key_api_update(struct socket *, struct mbuf *, 533 const struct sadb_msghdr *); 534 #ifdef IPSEC_DOSEQCHECK 535 static struct secasvar *key_getsavbyseq (struct secashead *, u_int32_t); 536 #endif 537 static int key_api_add(struct socket *, struct mbuf *, 538 const struct sadb_msghdr *); 539 static int key_setident (struct secashead *, struct mbuf *, 540 const struct sadb_msghdr *); 541 static struct mbuf *key_getmsgbuf_x1 (struct mbuf *, 542 const struct sadb_msghdr *); 543 static int key_api_delete(struct socket *, struct mbuf *, 544 const struct sadb_msghdr *); 545 static int key_api_get(struct socket *, struct mbuf *, 546 const struct sadb_msghdr *); 547 548 static void key_getcomb_setlifetime (struct sadb_comb *); 549 static struct mbuf *key_getcomb_esp (void); 550 static struct mbuf *key_getcomb_ah (void); 551 static struct mbuf *key_getcomb_ipcomp (void); 552 static struct mbuf *key_getprop (const struct secasindex *); 553 554 static int key_acquire (const struct secasindex *, struct secpolicy *); 555 #ifndef IPSEC_NONBLOCK_ACQUIRE 556 static struct secacq *key_newacq (const struct secasindex *); 557 static struct secacq *key_getacq (const struct secasindex *); 558 static struct secacq *key_getacqbyseq (u_int32_t); 559 #endif 560 #ifdef notyet 561 static struct secspacq *key_newspacq (const struct secpolicyindex *); 562 static struct secspacq *key_getspacq (const struct secpolicyindex *); 563 #endif 564 static int key_api_acquire(struct socket *, struct mbuf *, 565 const struct sadb_msghdr *); 566 static int key_api_register(struct socket *, struct mbuf *, 567 const struct sadb_msghdr *); 568 static int key_expire (struct secasvar *); 569 static int key_api_flush(struct socket *, struct mbuf *, 570 const struct sadb_msghdr *); 571 static struct mbuf *key_setdump_chain (u_int8_t req_satype, int *errorp, 572 int *lenp, pid_t pid); 573 static int key_api_dump(struct socket *, struct mbuf *, 574 const struct sadb_msghdr *); 575 static int key_api_promisc(struct socket *, struct mbuf *, 576 const struct sadb_msghdr *); 577 static int key_senderror (struct socket *, struct mbuf *, int); 578 static int key_validate_ext (const struct sadb_ext *, int); 579 static int key_align (struct mbuf *, struct sadb_msghdr *); 580 #if 0 581 static const char *key_getfqdn (void); 582 static const char *key_getuserfqdn (void); 583 #endif 584 static void key_sa_chgstate (struct secasvar *, u_int8_t); 585 static inline void key_sp_dead (struct secpolicy *); 586 static void key_sp_unlink (struct secpolicy *sp); 587 588 static struct mbuf *key_alloc_mbuf (int); 589 590 static void key_timehandler(void *); 591 static void key_timehandler_work(struct work *, void *); 592 static struct callout key_timehandler_ch; 593 static struct workqueue *key_timehandler_wq; 594 static struct work key_timehandler_wk; 595 596 #ifdef IPSEC_REF_DEBUG 597 #define REFLOG(label, p, where, tag) \ 598 log(LOG_DEBUG, "%s:%d: " label " : refcnt=%d (%p)\n.", \ 599 (where), (tag), (p)->refcnt, (p)) 600 #else 601 #define REFLOG(label, p, where, tag) do {} while (0) 602 #endif 603 604 #define SA_ADDREF(p) do { \ 605 atomic_inc_uint(&(p)->refcnt); \ 606 REFLOG("SA_ADDREF", (p), __func__, __LINE__); \ 607 KASSERTMSG((p)->refcnt != 0, "SA refcnt overflow"); \ 608 } while (0) 609 #define SA_ADDREF2(p, where, tag) do { \ 610 atomic_inc_uint(&(p)->refcnt); \ 611 REFLOG("SA_ADDREF", (p), (where), (tag)); \ 612 KASSERTMSG((p)->refcnt != 0, "SA refcnt overflow"); \ 613 } while (0) 614 #define SA_DELREF(p) do { \ 615 KASSERTMSG((p)->refcnt > 0, "SA refcnt underflow"); \ 616 atomic_dec_uint(&(p)->refcnt); \ 617 REFLOG("SA_DELREF", (p), __func__, __LINE__); \ 618 } while (0) 619 #define SA_DELREF2(p, nv, where, tag) do { \ 620 KASSERTMSG((p)->refcnt > 0, "SA refcnt underflow"); \ 621 nv = atomic_dec_uint_nv(&(p)->refcnt); \ 622 REFLOG("SA_DELREF", (p), (where), (tag)); \ 623 } while (0) 624 625 #define SP_ADDREF(p) do { \ 626 atomic_inc_uint(&(p)->refcnt); \ 627 REFLOG("SP_ADDREF", (p), __func__, __LINE__); \ 628 KASSERTMSG((p)->refcnt != 0, "SP refcnt overflow"); \ 629 } while (0) 630 #define SP_ADDREF2(p, where, tag) do { \ 631 atomic_inc_uint(&(p)->refcnt); \ 632 REFLOG("SP_ADDREF", (p), (where), (tag)); \ 633 KASSERTMSG((p)->refcnt != 0, "SP refcnt overflow"); \ 634 } while (0) 635 #define SP_DELREF(p) do { \ 636 KASSERTMSG((p)->refcnt > 0, "SP refcnt underflow"); \ 637 atomic_dec_uint(&(p)->refcnt); \ 638 REFLOG("SP_DELREF", (p), __func__, __LINE__); \ 639 } while (0) 640 #define SP_DELREF2(p, nv, where, tag) do { \ 641 KASSERTMSG((p)->refcnt > 0, "SP refcnt underflow"); \ 642 nv = atomic_dec_uint_nv(&(p)->refcnt); \ 643 REFLOG("SP_DELREF", (p), (where), (tag)); \ 644 } while (0) 645 646 u_int 647 key_sp_refcnt(const struct secpolicy *sp) 648 { 649 650 if (sp == NULL) 651 return 0; 652 653 return sp->refcnt; 654 } 655 656 static inline void 657 key_sp_dead(struct secpolicy *sp) 658 { 659 660 /* mark the SP dead */ 661 sp->state = IPSEC_SPSTATE_DEAD; 662 } 663 664 static void 665 key_sp_unlink(struct secpolicy *sp) 666 { 667 668 /* remove from SP index */ 669 SPLIST_WRITER_REMOVE(sp); 670 /* Release refcount held just for being on chain */ 671 KEY_FREESP(&sp); 672 } 673 674 675 /* 676 * Return 0 when there are known to be no SP's for the specified 677 * direction. Otherwise return 1. This is used by IPsec code 678 * to optimize performance. 679 */ 680 int 681 key_havesp(u_int dir) 682 { 683 return (dir == IPSEC_DIR_INBOUND || dir == IPSEC_DIR_OUTBOUND ? 684 !SPLIST_READER_EMPTY(dir) : 1); 685 } 686 687 /* %%% IPsec policy management */ 688 /* 689 * allocating a SP for OUTBOUND or INBOUND packet. 690 * Must call key_freesp() later. 691 * OUT: NULL: not found 692 * others: found and return the pointer. 693 */ 694 struct secpolicy * 695 key_lookup_sp_byspidx(const struct secpolicyindex *spidx, 696 u_int dir, const char* where, int tag) 697 { 698 struct secpolicy *sp; 699 int s; 700 701 KASSERT(spidx != NULL); 702 KASSERTMSG(IPSEC_DIR_IS_INOROUT(dir), "invalid direction %u", dir); 703 704 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP from %s:%u\n", where, tag); 705 706 /* get a SP entry */ 707 s = splsoftnet(); /*called from softclock()*/ 708 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 709 printf("*** objects\n"); 710 kdebug_secpolicyindex(spidx); 711 } 712 713 SPLIST_READER_FOREACH(sp, dir) { 714 if (KEYDEBUG_ON(KEYDEBUG_IPSEC_DATA)) { 715 printf("*** in SPD\n"); 716 kdebug_secpolicyindex(&sp->spidx); 717 } 718 719 if (sp->state == IPSEC_SPSTATE_DEAD) 720 continue; 721 if (key_spidx_match_withmask(&sp->spidx, spidx)) 722 goto found; 723 } 724 sp = NULL; 725 found: 726 if (sp) { 727 /* sanity check */ 728 KEY_CHKSPDIR(sp->spidx.dir, dir); 729 730 /* found a SPD entry */ 731 sp->lastused = time_uptime; 732 SP_ADDREF2(sp, where, tag); 733 } 734 splx(s); 735 736 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 737 "DP return SP:%p (ID=%u) refcnt %u\n", 738 sp, sp ? sp->id : 0, key_sp_refcnt(sp)); 739 return sp; 740 } 741 742 /* 743 * return a policy that matches this particular inbound packet. 744 * XXX slow 745 */ 746 struct secpolicy * 747 key_gettunnel(const struct sockaddr *osrc, 748 const struct sockaddr *odst, 749 const struct sockaddr *isrc, 750 const struct sockaddr *idst, 751 const char* where, int tag) 752 { 753 struct secpolicy *sp; 754 const int dir = IPSEC_DIR_INBOUND; 755 int s; 756 struct ipsecrequest *r1, *r2, *p; 757 struct secpolicyindex spidx; 758 759 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, "DP from %s:%u\n", where, tag); 760 761 if (isrc->sa_family != idst->sa_family) { 762 IPSECLOG(LOG_ERR, "protocol family mismatched %d != %d\n.", 763 isrc->sa_family, idst->sa_family); 764 sp = NULL; 765 goto done; 766 } 767 768 s = splsoftnet(); /*called from softclock()*/ 769 SPLIST_READER_FOREACH(sp, dir) { 770 if (sp->state == IPSEC_SPSTATE_DEAD) 771 continue; 772 773 r1 = r2 = NULL; 774 for (p = sp->req; p; p = p->next) { 775 if (p->saidx.mode != IPSEC_MODE_TUNNEL) 776 continue; 777 778 r1 = r2; 779 r2 = p; 780 781 if (!r1) { 782 /* here we look at address matches only */ 783 spidx = sp->spidx; 784 if (isrc->sa_len > sizeof(spidx.src) || 785 idst->sa_len > sizeof(spidx.dst)) 786 continue; 787 memcpy(&spidx.src, isrc, isrc->sa_len); 788 memcpy(&spidx.dst, idst, idst->sa_len); 789 if (!key_spidx_match_withmask(&sp->spidx, &spidx)) 790 continue; 791 } else { 792 if (!key_sockaddr_match(&r1->saidx.src.sa, isrc, PORT_NONE) || 793 !key_sockaddr_match(&r1->saidx.dst.sa, idst, PORT_NONE)) 794 continue; 795 } 796 797 if (!key_sockaddr_match(&r2->saidx.src.sa, osrc, PORT_NONE) || 798 !key_sockaddr_match(&r2->saidx.dst.sa, odst, PORT_NONE)) 799 continue; 800 801 goto found; 802 } 803 } 804 sp = NULL; 805 found: 806 if (sp) { 807 sp->lastused = time_uptime; 808 SP_ADDREF2(sp, where, tag); 809 } 810 splx(s); 811 done: 812 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 813 "DP return SP:%p (ID=%u) refcnt %u\n", 814 sp, sp ? sp->id : 0, key_sp_refcnt(sp)); 815 return sp; 816 } 817 818 /* 819 * allocating an SA entry for an *OUTBOUND* packet. 820 * checking each request entries in SP, and acquire an SA if need. 821 * OUT: 0: there are valid requests. 822 * ENOENT: policy may be valid, but SA with REQUIRE is on acquiring. 823 */ 824 int 825 key_checkrequest(struct ipsecrequest *isr, struct secasvar **ret) 826 { 827 u_int level; 828 int error; 829 const struct secasindex *saidx = &isr->saidx; 830 struct secasvar *sav; 831 832 KASSERT(isr != NULL); 833 KASSERTMSG(saidx->mode == IPSEC_MODE_TRANSPORT || 834 saidx->mode == IPSEC_MODE_TUNNEL, 835 "unexpected policy %u", saidx->mode); 836 837 /* get current level */ 838 level = ipsec_get_reqlevel(isr); 839 840 /* 841 * XXX guard against protocol callbacks from the crypto 842 * thread as they reference ipsecrequest.sav which we 843 * temporarily null out below. Need to rethink how we 844 * handle bundled SA's in the callback thread. 845 */ 846 IPSEC_SPLASSERT_SOFTNET("key_checkrequest"); 847 848 sav = key_lookup_sa_bysaidx(saidx); 849 if (sav != NULL) { 850 *ret = sav; 851 return 0; 852 } 853 854 /* there is no SA */ 855 error = key_acquire(saidx, isr->sp); 856 if (error != 0) { 857 /* XXX What should I do ? */ 858 IPSECLOG(LOG_DEBUG, "error %d returned from key_acquire.\n", 859 error); 860 return error; 861 } 862 863 if (level != IPSEC_LEVEL_REQUIRE) { 864 /* XXX sigh, the interface to this routine is botched */ 865 *ret = NULL; 866 return 0; 867 } else { 868 return ENOENT; 869 } 870 } 871 872 /* 873 * looking up a SA for policy entry from SAD. 874 * NOTE: searching SAD of aliving state. 875 * OUT: NULL: not found. 876 * others: found and return the pointer. 877 */ 878 static struct secasvar * 879 key_lookup_sa_bysaidx(const struct secasindex *saidx) 880 { 881 struct secashead *sah; 882 struct secasvar *sav; 883 u_int stateidx, state; 884 const u_int *saorder_state_valid; 885 int arraysize; 886 887 sah = key_getsah(saidx, CMP_MODE_REQID); 888 if (sah == NULL) 889 return NULL; 890 891 /* 892 * search a valid state list for outbound packet. 893 * This search order is important. 894 */ 895 if (key_prefered_oldsa) { 896 saorder_state_valid = saorder_state_valid_prefer_old; 897 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 898 } else { 899 saorder_state_valid = saorder_state_valid_prefer_new; 900 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 901 } 902 903 /* search valid state */ 904 for (stateidx = 0; 905 stateidx < arraysize; 906 stateidx++) { 907 908 state = saorder_state_valid[stateidx]; 909 910 if (key_prefered_oldsa) 911 sav = LIST_FIRST(&sah->savtree[state]); 912 else { 913 /* XXX need O(1) lookup */ 914 struct secasvar *last = NULL; 915 916 LIST_FOREACH(sav, &sah->savtree[state], chain) 917 last = sav; 918 sav = last; 919 } 920 if (sav != NULL) { 921 SA_ADDREF(sav); 922 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 923 "DP cause refcnt++:%d SA:%p\n", 924 sav->refcnt, sav); 925 return sav; 926 } 927 } 928 929 return NULL; 930 } 931 932 #if 0 933 static void 934 key_sendup_message_delete(struct secasvar *sav) 935 { 936 struct mbuf *m, *result = 0; 937 uint8_t satype; 938 939 satype = key_proto2satype(sav->sah->saidx.proto); 940 if (satype == 0) 941 goto msgfail; 942 943 m = key_setsadbmsg(SADB_DELETE, 0, satype, 0, 0, sav->refcnt - 1); 944 if (m == NULL) 945 goto msgfail; 946 result = m; 947 948 /* set sadb_address for saidx's. */ 949 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sav->sah->saidx.src.sa, 950 sav->sah->saidx.src.sa.sa_len << 3, IPSEC_ULPROTO_ANY); 951 if (m == NULL) 952 goto msgfail; 953 m_cat(result, m); 954 955 /* set sadb_address for saidx's. */ 956 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sav->sah->saidx.src.sa, 957 sav->sah->saidx.src.sa.sa_len << 3, IPSEC_ULPROTO_ANY); 958 if (m == NULL) 959 goto msgfail; 960 m_cat(result, m); 961 962 /* create SA extension */ 963 m = key_setsadbsa(sav); 964 if (m == NULL) 965 goto msgfail; 966 m_cat(result, m); 967 968 if (result->m_len < sizeof(struct sadb_msg)) { 969 result = m_pullup(result, sizeof(struct sadb_msg)); 970 if (result == NULL) 971 goto msgfail; 972 } 973 974 result->m_pkthdr.len = 0; 975 for (m = result; m; m = m->m_next) 976 result->m_pkthdr.len += m->m_len; 977 mtod(result, struct sadb_msg *)->sadb_msg_len = 978 PFKEY_UNIT64(result->m_pkthdr.len); 979 980 key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 981 result = NULL; 982 msgfail: 983 if (result) 984 m_freem(result); 985 } 986 #endif 987 988 /* 989 * allocating a usable SA entry for a *INBOUND* packet. 990 * Must call key_freesav() later. 991 * OUT: positive: pointer to a usable sav (i.e. MATURE or DYING state). 992 * NULL: not found, or error occurred. 993 * 994 * In the comparison, no source address is used--for RFC2401 conformance. 995 * To quote, from section 4.1: 996 * A security association is uniquely identified by a triple consisting 997 * of a Security Parameter Index (SPI), an IP Destination Address, and a 998 * security protocol (AH or ESP) identifier. 999 * Note that, however, we do need to keep source address in IPsec SA. 1000 * IKE specification and PF_KEY specification do assume that we 1001 * keep source address in IPsec SA. We see a tricky situation here. 1002 * 1003 * sport and dport are used for NAT-T. network order is always used. 1004 */ 1005 struct secasvar * 1006 key_lookup_sa( 1007 const union sockaddr_union *dst, 1008 u_int proto, 1009 u_int32_t spi, 1010 u_int16_t sport, 1011 u_int16_t dport, 1012 const char* where, int tag) 1013 { 1014 struct secashead *sah; 1015 struct secasvar *sav; 1016 u_int stateidx, state; 1017 const u_int *saorder_state_valid; 1018 int arraysize, chkport; 1019 int s; 1020 1021 int must_check_spi = 1; 1022 int must_check_alg = 0; 1023 u_int16_t cpi = 0; 1024 u_int8_t algo = 0; 1025 1026 if ((sport != 0) && (dport != 0)) 1027 chkport = PORT_STRICT; 1028 else 1029 chkport = PORT_NONE; 1030 1031 KASSERT(dst != NULL); 1032 1033 /* 1034 * XXX IPCOMP case 1035 * We use cpi to define spi here. In the case where cpi <= 1036 * IPCOMP_CPI_NEGOTIATE_MIN, cpi just define the algorithm used, not 1037 * the real spi. In this case, don't check the spi but check the 1038 * algorithm 1039 */ 1040 1041 if (proto == IPPROTO_IPCOMP) { 1042 u_int32_t tmp; 1043 tmp = ntohl(spi); 1044 cpi = (u_int16_t) tmp; 1045 if (cpi < IPCOMP_CPI_NEGOTIATE_MIN) { 1046 algo = (u_int8_t) cpi; 1047 must_check_spi = 0; 1048 must_check_alg = 1; 1049 } 1050 } 1051 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1052 "DP from %s:%u check_spi=%d, check_alg=%d\n", 1053 where, tag, must_check_spi, must_check_alg); 1054 1055 1056 /* 1057 * searching SAD. 1058 * XXX: to be checked internal IP header somewhere. Also when 1059 * IPsec tunnel packet is received. But ESP tunnel mode is 1060 * encrypted so we can't check internal IP header. 1061 */ 1062 s = splsoftnet(); /*called from softclock()*/ 1063 if (key_prefered_oldsa) { 1064 saorder_state_valid = saorder_state_valid_prefer_old; 1065 arraysize = _ARRAYLEN(saorder_state_valid_prefer_old); 1066 } else { 1067 saorder_state_valid = saorder_state_valid_prefer_new; 1068 arraysize = _ARRAYLEN(saorder_state_valid_prefer_new); 1069 } 1070 LIST_FOREACH(sah, &sahtree, chain) { 1071 /* search valid state */ 1072 for (stateidx = 0; stateidx < arraysize; stateidx++) { 1073 state = saorder_state_valid[stateidx]; 1074 LIST_FOREACH(sav, &sah->savtree[state], chain) { 1075 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 1076 "try match spi %#x, %#x\n", 1077 ntohl(spi), ntohl(sav->spi)); 1078 /* sanity check */ 1079 KEY_CHKSASTATE(sav->state, state); 1080 /* do not return entries w/ unusable state */ 1081 if (!SADB_SASTATE_USABLE_P(sav)) { 1082 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 1083 "bad state %d\n", sav->state); 1084 continue; 1085 } 1086 if (proto != sav->sah->saidx.proto) { 1087 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 1088 "proto fail %d != %d\n", 1089 proto, sav->sah->saidx.proto); 1090 continue; 1091 } 1092 if (must_check_spi && spi != sav->spi) { 1093 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 1094 "spi fail %#x != %#x\n", 1095 ntohl(spi), ntohl(sav->spi)); 1096 continue; 1097 } 1098 /* XXX only on the ipcomp case */ 1099 if (must_check_alg && algo != sav->alg_comp) { 1100 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 1101 "algo fail %d != %d\n", 1102 algo, sav->alg_comp); 1103 continue; 1104 } 1105 1106 #if 0 /* don't check src */ 1107 /* Fix port in src->sa */ 1108 1109 /* check src address */ 1110 if (!key_sockaddr_match(&src->sa, &sav->sah->saidx.src.sa, PORT_NONE)) 1111 continue; 1112 #endif 1113 /* fix port of dst address XXX*/ 1114 key_porttosaddr(__UNCONST(dst), dport); 1115 /* check dst address */ 1116 if (!key_sockaddr_match(&dst->sa, &sav->sah->saidx.dst.sa, chkport)) 1117 continue; 1118 SA_ADDREF2(sav, where, tag); 1119 goto done; 1120 } 1121 } 1122 } 1123 sav = NULL; 1124 done: 1125 splx(s); 1126 1127 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1128 "DP return SA:%p; refcnt %u\n", sav, sav ? sav->refcnt : 0); 1129 return sav; 1130 } 1131 1132 static void 1133 key_validate_savlist(const struct secashead *sah, const u_int state) 1134 { 1135 #ifdef DEBUG 1136 struct secasvar *sav, *next; 1137 1138 /* 1139 * The list should be sorted by lft_c->sadb_lifetime_addtime 1140 * in ascending order. 1141 */ 1142 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, next) { 1143 if (next != NULL && 1144 sav->lft_c != NULL && next->lft_c != NULL) { 1145 KDASSERTMSG(sav->lft_c->sadb_lifetime_addtime <= 1146 next->lft_c->sadb_lifetime_addtime, 1147 "savlist is not sorted: sah=%p, state=%d, " 1148 "sav=%" PRIu64 ", next=%" PRIu64, sah, state, 1149 sav->lft_c->sadb_lifetime_addtime, 1150 next->lft_c->sadb_lifetime_addtime); 1151 } 1152 } 1153 #endif 1154 } 1155 1156 void 1157 key_sp_ref(struct secpolicy *sp, const char* where, int tag) 1158 { 1159 1160 SP_ADDREF2(sp, where, tag); 1161 1162 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1163 "DP SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1164 sp, sp->id, where, tag, key_sp_refcnt(sp)); 1165 } 1166 1167 void 1168 key_sa_ref(struct secasvar *sav, const char* where, int tag) 1169 { 1170 1171 SA_ADDREF2(sav, where, tag); 1172 1173 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1174 "DP cause refcnt++:%d SA:%p from %s:%u\n", 1175 sav->refcnt, sav, where, tag); 1176 } 1177 1178 /* 1179 * Must be called after calling key_lookup_sp*(). 1180 * For both the packet without socket and key_freeso(). 1181 */ 1182 void 1183 _key_freesp(struct secpolicy **spp, const char* where, int tag) 1184 { 1185 struct secpolicy *sp = *spp; 1186 unsigned int nv; 1187 1188 KASSERT(sp != NULL); 1189 1190 SP_DELREF2(sp, nv, where, tag); 1191 1192 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1193 "DP SP:%p (ID=%u) from %s:%u; refcnt now %u\n", 1194 sp, sp->id, where, tag, nv); 1195 1196 if (nv == 0) { 1197 *spp = NULL; 1198 key_delsp(sp); 1199 } 1200 } 1201 1202 #if 0 1203 /* 1204 * Must be called after calling key_lookup_sp*(). 1205 * For the packet with socket. 1206 */ 1207 static void 1208 key_freeso(struct socket *so) 1209 { 1210 /* sanity check */ 1211 KASSERT(so != NULL); 1212 1213 switch (so->so_proto->pr_domain->dom_family) { 1214 #ifdef INET 1215 case PF_INET: 1216 { 1217 struct inpcb *pcb = sotoinpcb(so); 1218 1219 /* Does it have a PCB ? */ 1220 if (pcb == NULL) 1221 return; 1222 1223 struct inpcbpolicy *sp = pcb->inp_sp; 1224 key_freesp_so(&sp->sp_in); 1225 key_freesp_so(&sp->sp_out); 1226 } 1227 break; 1228 #endif 1229 #ifdef INET6 1230 case PF_INET6: 1231 { 1232 #ifdef HAVE_NRL_INPCB 1233 struct inpcb *pcb = sotoinpcb(so); 1234 struct inpcbpolicy *sp = pcb->inp_sp; 1235 1236 /* Does it have a PCB ? */ 1237 if (pcb == NULL) 1238 return; 1239 key_freesp_so(&sp->sp_in); 1240 key_freesp_so(&sp->sp_out); 1241 #else 1242 struct in6pcb *pcb = sotoin6pcb(so); 1243 1244 /* Does it have a PCB ? */ 1245 if (pcb == NULL) 1246 return; 1247 key_freesp_so(&pcb->in6p_sp->sp_in); 1248 key_freesp_so(&pcb->in6p_sp->sp_out); 1249 #endif 1250 } 1251 break; 1252 #endif /* INET6 */ 1253 default: 1254 IPSECLOG(LOG_DEBUG, "unknown address family=%d.\n", 1255 so->so_proto->pr_domain->dom_family); 1256 return; 1257 } 1258 } 1259 1260 static void 1261 key_freesp_so(struct secpolicy **sp) 1262 { 1263 1264 KASSERT(sp != NULL); 1265 KASSERT(*sp != NULL); 1266 1267 if ((*sp)->policy == IPSEC_POLICY_ENTRUST || 1268 (*sp)->policy == IPSEC_POLICY_BYPASS) 1269 return; 1270 1271 KASSERTMSG((*sp)->policy == IPSEC_POLICY_IPSEC, 1272 "invalid policy %u", (*sp)->policy); 1273 KEY_FREESP(sp); 1274 } 1275 #endif 1276 1277 /* 1278 * Must be called after calling key_lookup_sa(). 1279 * This function is called by key_freesp() to free some SA allocated 1280 * for a policy. 1281 */ 1282 void 1283 key_freesav(struct secasvar **psav, const char* where, int tag) 1284 { 1285 struct secasvar *sav = *psav; 1286 unsigned int nv; 1287 1288 KASSERT(sav != NULL); 1289 1290 SA_DELREF2(sav, nv, where, tag); 1291 1292 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1293 "DP SA:%p (SPI %lu) from %s:%u; refcnt now %u\n", 1294 sav, (u_long)ntohl(sav->spi), where, tag, nv); 1295 1296 if (nv == 0) { 1297 *psav = NULL; 1298 1299 /* remove from SA header */ 1300 KASSERT(__LIST_CHAINED(sav)); 1301 LIST_REMOVE(sav, chain); 1302 1303 key_delsav(sav); 1304 } 1305 } 1306 1307 /* %%% SPD management */ 1308 /* 1309 * free security policy entry. 1310 */ 1311 static void 1312 key_delsp(struct secpolicy *sp) 1313 { 1314 int s; 1315 1316 KASSERT(sp != NULL); 1317 1318 key_sp_dead(sp); 1319 1320 KASSERTMSG(sp->refcnt == 0, 1321 "SP with references deleted (refcnt %u)", sp->refcnt); 1322 1323 s = splsoftnet(); /*called from softclock()*/ 1324 1325 { 1326 struct ipsecrequest *isr = sp->req, *nextisr; 1327 1328 while (isr != NULL) { 1329 nextisr = isr->next; 1330 kmem_intr_free(isr, sizeof(*isr)); 1331 isr = nextisr; 1332 } 1333 } 1334 1335 SPLIST_ENTRY_DESTROY(sp); 1336 kmem_intr_free(sp, sizeof(*sp)); 1337 1338 splx(s); 1339 } 1340 1341 /* 1342 * search SPD 1343 * OUT: NULL : not found 1344 * others : found, pointer to a SP. 1345 */ 1346 static struct secpolicy * 1347 key_getsp(const struct secpolicyindex *spidx) 1348 { 1349 struct secpolicy *sp; 1350 1351 KASSERT(spidx != NULL); 1352 1353 SPLIST_READER_FOREACH(sp, spidx->dir) { 1354 if (sp->state == IPSEC_SPSTATE_DEAD) 1355 continue; 1356 if (key_spidx_match_exactly(spidx, &sp->spidx)) { 1357 SP_ADDREF(sp); 1358 return sp; 1359 } 1360 } 1361 1362 return NULL; 1363 } 1364 1365 /* 1366 * get SP by index. 1367 * OUT: NULL : not found 1368 * others : found, pointer to a SP. 1369 */ 1370 static struct secpolicy * 1371 key_getspbyid(u_int32_t id) 1372 { 1373 struct secpolicy *sp; 1374 1375 SPLIST_READER_FOREACH(sp, IPSEC_DIR_INBOUND) { 1376 if (sp->state == IPSEC_SPSTATE_DEAD) 1377 continue; 1378 if (sp->id == id) { 1379 SP_ADDREF(sp); 1380 return sp; 1381 } 1382 } 1383 1384 SPLIST_READER_FOREACH(sp, IPSEC_DIR_OUTBOUND) { 1385 if (sp->state == IPSEC_SPSTATE_DEAD) 1386 continue; 1387 if (sp->id == id) { 1388 SP_ADDREF(sp); 1389 return sp; 1390 } 1391 } 1392 1393 return NULL; 1394 } 1395 1396 struct secpolicy * 1397 key_newsp(const char* where, int tag) 1398 { 1399 struct secpolicy *newsp = NULL; 1400 1401 newsp = kmem_intr_zalloc(sizeof(struct secpolicy), KM_NOSLEEP); 1402 if (newsp != NULL) 1403 newsp->refcnt = 1; 1404 1405 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 1406 "DP from %s:%u return SP:%p\n", where, tag, newsp); 1407 return newsp; 1408 } 1409 1410 /* 1411 * create secpolicy structure from sadb_x_policy structure. 1412 * NOTE: `state', `secpolicyindex' in secpolicy structure are not set, 1413 * so must be set properly later. 1414 */ 1415 struct secpolicy * 1416 key_msg2sp(const struct sadb_x_policy *xpl0, size_t len, int *error) 1417 { 1418 struct secpolicy *newsp; 1419 1420 KASSERT(!cpu_softintr_p()); 1421 KASSERT(xpl0 != NULL); 1422 KASSERT(len >= sizeof(*xpl0)); 1423 1424 if (len != PFKEY_EXTLEN(xpl0)) { 1425 IPSECLOG(LOG_DEBUG, "Invalid msg length.\n"); 1426 *error = EINVAL; 1427 return NULL; 1428 } 1429 1430 newsp = KEY_NEWSP(); 1431 if (newsp == NULL) { 1432 *error = ENOBUFS; 1433 return NULL; 1434 } 1435 1436 newsp->spidx.dir = xpl0->sadb_x_policy_dir; 1437 newsp->policy = xpl0->sadb_x_policy_type; 1438 1439 /* check policy */ 1440 switch (xpl0->sadb_x_policy_type) { 1441 case IPSEC_POLICY_DISCARD: 1442 case IPSEC_POLICY_NONE: 1443 case IPSEC_POLICY_ENTRUST: 1444 case IPSEC_POLICY_BYPASS: 1445 newsp->req = NULL; 1446 *error = 0; 1447 return newsp; 1448 1449 case IPSEC_POLICY_IPSEC: 1450 /* Continued */ 1451 break; 1452 default: 1453 IPSECLOG(LOG_DEBUG, "invalid policy type.\n"); 1454 KEY_FREESP(&newsp); 1455 *error = EINVAL; 1456 return NULL; 1457 } 1458 1459 /* IPSEC_POLICY_IPSEC */ 1460 { 1461 int tlen; 1462 const struct sadb_x_ipsecrequest *xisr; 1463 uint16_t xisr_reqid; 1464 struct ipsecrequest **p_isr = &newsp->req; 1465 1466 /* validity check */ 1467 if (PFKEY_EXTLEN(xpl0) < sizeof(*xpl0)) { 1468 IPSECLOG(LOG_DEBUG, "Invalid msg length.\n"); 1469 *error = EINVAL; 1470 goto free_exit; 1471 } 1472 1473 tlen = PFKEY_EXTLEN(xpl0) - sizeof(*xpl0); 1474 xisr = (const struct sadb_x_ipsecrequest *)(xpl0 + 1); 1475 1476 while (tlen > 0) { 1477 /* length check */ 1478 if (xisr->sadb_x_ipsecrequest_len < sizeof(*xisr)) { 1479 IPSECLOG(LOG_DEBUG, "invalid ipsecrequest length.\n"); 1480 *error = EINVAL; 1481 goto free_exit; 1482 } 1483 1484 /* allocate request buffer */ 1485 *p_isr = kmem_zalloc(sizeof(**p_isr), KM_SLEEP); 1486 1487 /* set values */ 1488 (*p_isr)->next = NULL; 1489 1490 switch (xisr->sadb_x_ipsecrequest_proto) { 1491 case IPPROTO_ESP: 1492 case IPPROTO_AH: 1493 case IPPROTO_IPCOMP: 1494 break; 1495 default: 1496 IPSECLOG(LOG_DEBUG, "invalid proto type=%u\n", 1497 xisr->sadb_x_ipsecrequest_proto); 1498 *error = EPROTONOSUPPORT; 1499 goto free_exit; 1500 } 1501 (*p_isr)->saidx.proto = xisr->sadb_x_ipsecrequest_proto; 1502 1503 switch (xisr->sadb_x_ipsecrequest_mode) { 1504 case IPSEC_MODE_TRANSPORT: 1505 case IPSEC_MODE_TUNNEL: 1506 break; 1507 case IPSEC_MODE_ANY: 1508 default: 1509 IPSECLOG(LOG_DEBUG, "invalid mode=%u\n", 1510 xisr->sadb_x_ipsecrequest_mode); 1511 *error = EINVAL; 1512 goto free_exit; 1513 } 1514 (*p_isr)->saidx.mode = xisr->sadb_x_ipsecrequest_mode; 1515 1516 switch (xisr->sadb_x_ipsecrequest_level) { 1517 case IPSEC_LEVEL_DEFAULT: 1518 case IPSEC_LEVEL_USE: 1519 case IPSEC_LEVEL_REQUIRE: 1520 break; 1521 case IPSEC_LEVEL_UNIQUE: 1522 xisr_reqid = xisr->sadb_x_ipsecrequest_reqid; 1523 /* validity check */ 1524 /* 1525 * If range violation of reqid, kernel will 1526 * update it, don't refuse it. 1527 */ 1528 if (xisr_reqid > IPSEC_MANUAL_REQID_MAX) { 1529 IPSECLOG(LOG_DEBUG, 1530 "reqid=%d range " 1531 "violation, updated by kernel.\n", 1532 xisr_reqid); 1533 xisr_reqid = 0; 1534 } 1535 1536 /* allocate new reqid id if reqid is zero. */ 1537 if (xisr_reqid == 0) { 1538 u_int16_t reqid = key_newreqid(); 1539 if (reqid == 0) { 1540 *error = ENOBUFS; 1541 goto free_exit; 1542 } 1543 (*p_isr)->saidx.reqid = reqid; 1544 } else { 1545 /* set it for manual keying. */ 1546 (*p_isr)->saidx.reqid = xisr_reqid; 1547 } 1548 break; 1549 1550 default: 1551 IPSECLOG(LOG_DEBUG, "invalid level=%u\n", 1552 xisr->sadb_x_ipsecrequest_level); 1553 *error = EINVAL; 1554 goto free_exit; 1555 } 1556 (*p_isr)->level = xisr->sadb_x_ipsecrequest_level; 1557 1558 /* set IP addresses if there */ 1559 if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) { 1560 const struct sockaddr *paddr; 1561 1562 paddr = (const struct sockaddr *)(xisr + 1); 1563 1564 /* validity check */ 1565 if (paddr->sa_len > sizeof((*p_isr)->saidx.src)) { 1566 IPSECLOG(LOG_DEBUG, "invalid request " 1567 "address length.\n"); 1568 *error = EINVAL; 1569 goto free_exit; 1570 } 1571 memcpy(&(*p_isr)->saidx.src, paddr, paddr->sa_len); 1572 1573 paddr = (const struct sockaddr *)((const char *)paddr 1574 + paddr->sa_len); 1575 1576 /* validity check */ 1577 if (paddr->sa_len > sizeof((*p_isr)->saidx.dst)) { 1578 IPSECLOG(LOG_DEBUG, "invalid request " 1579 "address length.\n"); 1580 *error = EINVAL; 1581 goto free_exit; 1582 } 1583 memcpy(&(*p_isr)->saidx.dst, paddr, paddr->sa_len); 1584 } 1585 1586 (*p_isr)->sp = newsp; 1587 1588 /* initialization for the next. */ 1589 p_isr = &(*p_isr)->next; 1590 tlen -= xisr->sadb_x_ipsecrequest_len; 1591 1592 /* validity check */ 1593 if (tlen < 0) { 1594 IPSECLOG(LOG_DEBUG, "becoming tlen < 0.\n"); 1595 *error = EINVAL; 1596 goto free_exit; 1597 } 1598 1599 xisr = (const struct sadb_x_ipsecrequest *)((const char *)xisr + 1600 xisr->sadb_x_ipsecrequest_len); 1601 } 1602 } 1603 1604 *error = 0; 1605 return newsp; 1606 1607 free_exit: 1608 KEY_FREESP(&newsp); 1609 return NULL; 1610 } 1611 1612 static u_int16_t 1613 key_newreqid(void) 1614 { 1615 static u_int16_t auto_reqid = IPSEC_MANUAL_REQID_MAX + 1; 1616 1617 auto_reqid = (auto_reqid == 0xffff ? 1618 IPSEC_MANUAL_REQID_MAX + 1 : auto_reqid + 1); 1619 1620 /* XXX should be unique check */ 1621 1622 return auto_reqid; 1623 } 1624 1625 /* 1626 * copy secpolicy struct to sadb_x_policy structure indicated. 1627 */ 1628 struct mbuf * 1629 key_sp2msg(const struct secpolicy *sp) 1630 { 1631 struct sadb_x_policy *xpl; 1632 int tlen; 1633 char *p; 1634 struct mbuf *m; 1635 1636 KASSERT(sp != NULL); 1637 1638 tlen = key_getspreqmsglen(sp); 1639 1640 m = key_alloc_mbuf(tlen); 1641 if (!m || m->m_next) { /*XXX*/ 1642 if (m) 1643 m_freem(m); 1644 return NULL; 1645 } 1646 1647 m->m_len = tlen; 1648 m->m_next = NULL; 1649 xpl = mtod(m, struct sadb_x_policy *); 1650 memset(xpl, 0, tlen); 1651 1652 xpl->sadb_x_policy_len = PFKEY_UNIT64(tlen); 1653 xpl->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 1654 xpl->sadb_x_policy_type = sp->policy; 1655 xpl->sadb_x_policy_dir = sp->spidx.dir; 1656 xpl->sadb_x_policy_id = sp->id; 1657 p = (char *)xpl + sizeof(*xpl); 1658 1659 /* if is the policy for ipsec ? */ 1660 if (sp->policy == IPSEC_POLICY_IPSEC) { 1661 struct sadb_x_ipsecrequest *xisr; 1662 struct ipsecrequest *isr; 1663 1664 for (isr = sp->req; isr != NULL; isr = isr->next) { 1665 1666 xisr = (struct sadb_x_ipsecrequest *)p; 1667 1668 xisr->sadb_x_ipsecrequest_proto = isr->saidx.proto; 1669 xisr->sadb_x_ipsecrequest_mode = isr->saidx.mode; 1670 xisr->sadb_x_ipsecrequest_level = isr->level; 1671 xisr->sadb_x_ipsecrequest_reqid = isr->saidx.reqid; 1672 1673 p += sizeof(*xisr); 1674 memcpy(p, &isr->saidx.src, isr->saidx.src.sa.sa_len); 1675 p += isr->saidx.src.sa.sa_len; 1676 memcpy(p, &isr->saidx.dst, isr->saidx.dst.sa.sa_len); 1677 p += isr->saidx.src.sa.sa_len; 1678 1679 xisr->sadb_x_ipsecrequest_len = 1680 PFKEY_ALIGN8(sizeof(*xisr) 1681 + isr->saidx.src.sa.sa_len 1682 + isr->saidx.dst.sa.sa_len); 1683 } 1684 } 1685 1686 return m; 1687 } 1688 1689 /* m will not be freed nor modified */ 1690 static struct mbuf * 1691 key_gather_mbuf(struct mbuf *m, const struct sadb_msghdr *mhp, 1692 int ndeep, int nitem, ...) 1693 { 1694 va_list ap; 1695 int idx; 1696 int i; 1697 struct mbuf *result = NULL, *n; 1698 int len; 1699 1700 KASSERT(m != NULL); 1701 KASSERT(mhp != NULL); 1702 1703 va_start(ap, nitem); 1704 for (i = 0; i < nitem; i++) { 1705 idx = va_arg(ap, int); 1706 if (idx < 0 || idx > SADB_EXT_MAX) 1707 goto fail; 1708 /* don't attempt to pull empty extension */ 1709 if (idx == SADB_EXT_RESERVED && mhp->msg == NULL) 1710 continue; 1711 if (idx != SADB_EXT_RESERVED && 1712 (mhp->ext[idx] == NULL || mhp->extlen[idx] == 0)) 1713 continue; 1714 1715 if (idx == SADB_EXT_RESERVED) { 1716 CTASSERT(PFKEY_ALIGN8(sizeof(struct sadb_msg)) <= MHLEN); 1717 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 1718 MGETHDR(n, M_DONTWAIT, MT_DATA); 1719 if (!n) 1720 goto fail; 1721 n->m_len = len; 1722 n->m_next = NULL; 1723 m_copydata(m, 0, sizeof(struct sadb_msg), 1724 mtod(n, void *)); 1725 } else if (i < ndeep) { 1726 len = mhp->extlen[idx]; 1727 n = key_alloc_mbuf(len); 1728 if (!n || n->m_next) { /*XXX*/ 1729 if (n) 1730 m_freem(n); 1731 goto fail; 1732 } 1733 m_copydata(m, mhp->extoff[idx], mhp->extlen[idx], 1734 mtod(n, void *)); 1735 } else { 1736 n = m_copym(m, mhp->extoff[idx], mhp->extlen[idx], 1737 M_DONTWAIT); 1738 } 1739 if (n == NULL) 1740 goto fail; 1741 1742 if (result) 1743 m_cat(result, n); 1744 else 1745 result = n; 1746 } 1747 va_end(ap); 1748 1749 if (result && (result->m_flags & M_PKTHDR) != 0) { 1750 result->m_pkthdr.len = 0; 1751 for (n = result; n; n = n->m_next) 1752 result->m_pkthdr.len += n->m_len; 1753 } 1754 1755 return result; 1756 1757 fail: 1758 va_end(ap); 1759 m_freem(result); 1760 return NULL; 1761 } 1762 1763 /* 1764 * SADB_X_SPDADD, SADB_X_SPDSETIDX or SADB_X_SPDUPDATE processing 1765 * add an entry to SP database, when received 1766 * <base, address(SD), (lifetime(H),) policy> 1767 * from the user(?). 1768 * Adding to SP database, 1769 * and send 1770 * <base, address(SD), (lifetime(H),) policy> 1771 * to the socket which was send. 1772 * 1773 * SPDADD set a unique policy entry. 1774 * SPDSETIDX like SPDADD without a part of policy requests. 1775 * SPDUPDATE replace a unique policy entry. 1776 * 1777 * m will always be freed. 1778 */ 1779 static int 1780 key_api_spdadd(struct socket *so, struct mbuf *m, 1781 const struct sadb_msghdr *mhp) 1782 { 1783 const struct sockaddr *src, *dst; 1784 const struct sadb_x_policy *xpl0; 1785 struct sadb_x_policy *xpl; 1786 const struct sadb_lifetime *lft = NULL; 1787 struct secpolicyindex spidx; 1788 struct secpolicy *newsp; 1789 int error; 1790 1791 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 1792 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 1793 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 1794 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 1795 return key_senderror(so, m, EINVAL); 1796 } 1797 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 1798 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 1799 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 1800 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 1801 return key_senderror(so, m, EINVAL); 1802 } 1803 if (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL) { 1804 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < 1805 sizeof(struct sadb_lifetime)) { 1806 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 1807 return key_senderror(so, m, EINVAL); 1808 } 1809 lft = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 1810 } 1811 1812 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 1813 1814 /* checking the direciton. */ 1815 switch (xpl0->sadb_x_policy_dir) { 1816 case IPSEC_DIR_INBOUND: 1817 case IPSEC_DIR_OUTBOUND: 1818 break; 1819 default: 1820 IPSECLOG(LOG_DEBUG, "Invalid SP direction.\n"); 1821 return key_senderror(so, m, EINVAL); 1822 } 1823 1824 /* check policy */ 1825 /* key_api_spdadd() accepts DISCARD, NONE and IPSEC. */ 1826 if (xpl0->sadb_x_policy_type == IPSEC_POLICY_ENTRUST || 1827 xpl0->sadb_x_policy_type == IPSEC_POLICY_BYPASS) { 1828 IPSECLOG(LOG_DEBUG, "Invalid policy type.\n"); 1829 return key_senderror(so, m, EINVAL); 1830 } 1831 1832 /* policy requests are mandatory when action is ipsec. */ 1833 if (mhp->msg->sadb_msg_type != SADB_X_SPDSETIDX && 1834 xpl0->sadb_x_policy_type == IPSEC_POLICY_IPSEC && 1835 mhp->extlen[SADB_X_EXT_POLICY] <= sizeof(*xpl0)) { 1836 IPSECLOG(LOG_DEBUG, "some policy requests part required.\n"); 1837 return key_senderror(so, m, EINVAL); 1838 } 1839 1840 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 1841 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 1842 1843 /* sanity check on addr pair */ 1844 if (src->sa_family != dst->sa_family) 1845 return key_senderror(so, m, EINVAL); 1846 if (src->sa_len != dst->sa_len) 1847 return key_senderror(so, m, EINVAL); 1848 1849 key_init_spidx_bymsghdr(&spidx, mhp); 1850 1851 /* 1852 * checking there is SP already or not. 1853 * SPDUPDATE doesn't depend on whether there is a SP or not. 1854 * If the type is either SPDADD or SPDSETIDX AND a SP is found, 1855 * then error. 1856 */ 1857 { 1858 struct secpolicy *sp; 1859 1860 sp = key_getsp(&spidx); 1861 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1862 if (sp) { 1863 key_sp_dead(sp); 1864 key_sp_unlink(sp); /* XXX jrs ordering */ 1865 KEY_FREESP(&sp); 1866 } 1867 } else { 1868 if (sp != NULL) { 1869 KEY_FREESP(&sp); 1870 IPSECLOG(LOG_DEBUG, "a SP entry exists already.\n"); 1871 return key_senderror(so, m, EEXIST); 1872 } 1873 } 1874 } 1875 1876 /* allocation new SP entry */ 1877 newsp = key_msg2sp(xpl0, PFKEY_EXTLEN(xpl0), &error); 1878 if (newsp == NULL) { 1879 return key_senderror(so, m, error); 1880 } 1881 1882 newsp->id = key_getnewspid(); 1883 if (newsp->id == 0) { 1884 kmem_free(newsp, sizeof(*newsp)); 1885 return key_senderror(so, m, ENOBUFS); 1886 } 1887 1888 newsp->spidx = spidx; 1889 newsp->created = time_uptime; 1890 newsp->lastused = newsp->created; 1891 newsp->lifetime = lft ? lft->sadb_lifetime_addtime : 0; 1892 newsp->validtime = lft ? lft->sadb_lifetime_usetime : 0; 1893 1894 newsp->refcnt = 1; /* do not reclaim until I say I do */ 1895 newsp->state = IPSEC_SPSTATE_ALIVE; 1896 if (newsp->policy == IPSEC_POLICY_IPSEC) 1897 KASSERT(newsp->req != NULL); 1898 SPLIST_ENTRY_INIT(newsp); 1899 SPLIST_WRITER_INSERT_TAIL(newsp->spidx.dir, newsp); 1900 1901 #ifdef notyet 1902 /* delete the entry in spacqtree */ 1903 if (mhp->msg->sadb_msg_type == SADB_X_SPDUPDATE) { 1904 struct secspacq *spacq = key_getspacq(&spidx); 1905 if (spacq != NULL) { 1906 /* reset counter in order to deletion by timehandler. */ 1907 spacq->created = time_uptime; 1908 spacq->count = 0; 1909 } 1910 } 1911 #endif 1912 1913 /* Invalidate all cached SPD pointers in the PCBs. */ 1914 ipsec_invalpcbcacheall(); 1915 1916 #if defined(GATEWAY) 1917 /* Invalidate the ipflow cache, as well. */ 1918 ipflow_invalidate_all(0); 1919 #ifdef INET6 1920 if (in6_present) 1921 ip6flow_invalidate_all(0); 1922 #endif /* INET6 */ 1923 #endif /* GATEWAY */ 1924 1925 { 1926 struct mbuf *n, *mpolicy; 1927 int off; 1928 1929 /* create new sadb_msg to reply. */ 1930 if (lft) { 1931 n = key_gather_mbuf(m, mhp, 2, 5, SADB_EXT_RESERVED, 1932 SADB_X_EXT_POLICY, SADB_EXT_LIFETIME_HARD, 1933 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1934 } else { 1935 n = key_gather_mbuf(m, mhp, 2, 4, SADB_EXT_RESERVED, 1936 SADB_X_EXT_POLICY, 1937 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 1938 } 1939 if (!n) 1940 return key_senderror(so, m, ENOBUFS); 1941 1942 n = key_fill_replymsg(n, 0); 1943 if (n == NULL) 1944 return key_senderror(so, m, ENOBUFS); 1945 1946 off = 0; 1947 mpolicy = m_pulldown(n, PFKEY_ALIGN8(sizeof(struct sadb_msg)), 1948 sizeof(*xpl), &off); 1949 if (mpolicy == NULL) { 1950 /* n is already freed */ 1951 return key_senderror(so, m, ENOBUFS); 1952 } 1953 xpl = (struct sadb_x_policy *)(mtod(mpolicy, char *) + off); 1954 if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) { 1955 m_freem(n); 1956 return key_senderror(so, m, EINVAL); 1957 } 1958 xpl->sadb_x_policy_id = newsp->id; 1959 1960 m_freem(m); 1961 key_update_used(); 1962 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 1963 } 1964 } 1965 1966 /* 1967 * get new policy id. 1968 * OUT: 1969 * 0: failure. 1970 * others: success. 1971 */ 1972 static u_int32_t 1973 key_getnewspid(void) 1974 { 1975 u_int32_t newid = 0; 1976 int count = key_spi_trycnt; /* XXX */ 1977 struct secpolicy *sp; 1978 1979 /* when requesting to allocate spi ranged */ 1980 while (count--) { 1981 newid = (policy_id = (policy_id == ~0 ? 1 : policy_id + 1)); 1982 1983 sp = key_getspbyid(newid); 1984 if (sp == NULL) 1985 break; 1986 1987 KEY_FREESP(&sp); 1988 } 1989 1990 if (count == 0 || newid == 0) { 1991 IPSECLOG(LOG_DEBUG, "to allocate policy id is failed.\n"); 1992 return 0; 1993 } 1994 1995 return newid; 1996 } 1997 1998 /* 1999 * SADB_SPDDELETE processing 2000 * receive 2001 * <base, address(SD), policy(*)> 2002 * from the user(?), and set SADB_SASTATE_DEAD, 2003 * and send, 2004 * <base, address(SD), policy(*)> 2005 * to the ikmpd. 2006 * policy(*) including direction of policy. 2007 * 2008 * m will always be freed. 2009 */ 2010 static int 2011 key_api_spddelete(struct socket *so, struct mbuf *m, 2012 const struct sadb_msghdr *mhp) 2013 { 2014 struct sadb_x_policy *xpl0; 2015 struct secpolicyindex spidx; 2016 struct secpolicy *sp; 2017 2018 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 2019 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 2020 mhp->ext[SADB_X_EXT_POLICY] == NULL) { 2021 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 2022 return key_senderror(so, m, EINVAL); 2023 } 2024 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 2025 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 2026 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2027 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 2028 return key_senderror(so, m, EINVAL); 2029 } 2030 2031 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 2032 2033 /* checking the direciton. */ 2034 switch (xpl0->sadb_x_policy_dir) { 2035 case IPSEC_DIR_INBOUND: 2036 case IPSEC_DIR_OUTBOUND: 2037 break; 2038 default: 2039 IPSECLOG(LOG_DEBUG, "Invalid SP direction.\n"); 2040 return key_senderror(so, m, EINVAL); 2041 } 2042 2043 /* make secindex */ 2044 key_init_spidx_bymsghdr(&spidx, mhp); 2045 2046 /* Is there SP in SPD ? */ 2047 sp = key_getsp(&spidx); 2048 if (sp == NULL) { 2049 IPSECLOG(LOG_DEBUG, "no SP found.\n"); 2050 return key_senderror(so, m, EINVAL); 2051 } 2052 2053 /* save policy id to buffer to be returned. */ 2054 xpl0->sadb_x_policy_id = sp->id; 2055 2056 key_sp_dead(sp); 2057 key_sp_unlink(sp); /* XXX jrs ordering */ 2058 KEY_FREESP(&sp); /* ref gained by key_getspbyid */ 2059 2060 /* Invalidate all cached SPD pointers in the PCBs. */ 2061 ipsec_invalpcbcacheall(); 2062 2063 /* We're deleting policy; no need to invalidate the ipflow cache. */ 2064 2065 { 2066 struct mbuf *n; 2067 2068 /* create new sadb_msg to reply. */ 2069 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 2070 SADB_X_EXT_POLICY, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 2071 if (!n) 2072 return key_senderror(so, m, ENOBUFS); 2073 2074 n = key_fill_replymsg(n, 0); 2075 if (n == NULL) 2076 return key_senderror(so, m, ENOBUFS); 2077 2078 m_freem(m); 2079 key_update_used(); 2080 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2081 } 2082 } 2083 2084 /* 2085 * SADB_SPDDELETE2 processing 2086 * receive 2087 * <base, policy(*)> 2088 * from the user(?), and set SADB_SASTATE_DEAD, 2089 * and send, 2090 * <base, policy(*)> 2091 * to the ikmpd. 2092 * policy(*) including direction of policy. 2093 * 2094 * m will always be freed. 2095 */ 2096 static int 2097 key_api_spddelete2(struct socket *so, struct mbuf *m, 2098 const struct sadb_msghdr *mhp) 2099 { 2100 u_int32_t id; 2101 struct secpolicy *sp; 2102 2103 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2104 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2105 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 2106 return key_senderror(so, m, EINVAL); 2107 } 2108 2109 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2110 2111 /* Is there SP in SPD ? */ 2112 sp = key_getspbyid(id); 2113 if (sp == NULL) { 2114 IPSECLOG(LOG_DEBUG, "no SP found id:%u.\n", id); 2115 return key_senderror(so, m, EINVAL); 2116 } 2117 2118 key_sp_dead(sp); 2119 key_sp_unlink(sp); /* XXX jrs ordering */ 2120 KEY_FREESP(&sp); /* ref gained by key_getsp */ 2121 sp = NULL; 2122 2123 /* Invalidate all cached SPD pointers in the PCBs. */ 2124 ipsec_invalpcbcacheall(); 2125 2126 /* We're deleting policy; no need to invalidate the ipflow cache. */ 2127 2128 { 2129 struct mbuf *n, *nn; 2130 int off, len; 2131 2132 CTASSERT(PFKEY_ALIGN8(sizeof(struct sadb_msg)) <= MCLBYTES); 2133 2134 /* create new sadb_msg to reply. */ 2135 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2136 2137 MGETHDR(n, M_DONTWAIT, MT_DATA); 2138 if (n && len > MHLEN) { 2139 MCLGET(n, M_DONTWAIT); 2140 if ((n->m_flags & M_EXT) == 0) { 2141 m_freem(n); 2142 n = NULL; 2143 } 2144 } 2145 if (!n) 2146 return key_senderror(so, m, ENOBUFS); 2147 2148 n->m_len = len; 2149 n->m_next = NULL; 2150 off = 0; 2151 2152 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); 2153 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2154 2155 KASSERTMSG(off == len, "length inconsistency"); 2156 2157 n->m_next = m_copym(m, mhp->extoff[SADB_X_EXT_POLICY], 2158 mhp->extlen[SADB_X_EXT_POLICY], M_DONTWAIT); 2159 if (!n->m_next) { 2160 m_freem(n); 2161 return key_senderror(so, m, ENOBUFS); 2162 } 2163 2164 n->m_pkthdr.len = 0; 2165 for (nn = n; nn; nn = nn->m_next) 2166 n->m_pkthdr.len += nn->m_len; 2167 2168 n = key_fill_replymsg(n, 0); 2169 if (n == NULL) 2170 return key_senderror(so, m, ENOBUFS); 2171 2172 m_freem(m); 2173 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 2174 } 2175 } 2176 2177 /* 2178 * SADB_X_GET processing 2179 * receive 2180 * <base, policy(*)> 2181 * from the user(?), 2182 * and send, 2183 * <base, address(SD), policy> 2184 * to the ikmpd. 2185 * policy(*) including direction of policy. 2186 * 2187 * m will always be freed. 2188 */ 2189 static int 2190 key_api_spdget(struct socket *so, struct mbuf *m, 2191 const struct sadb_msghdr *mhp) 2192 { 2193 u_int32_t id; 2194 struct secpolicy *sp; 2195 struct mbuf *n; 2196 2197 if (mhp->ext[SADB_X_EXT_POLICY] == NULL || 2198 mhp->extlen[SADB_X_EXT_POLICY] < sizeof(struct sadb_x_policy)) { 2199 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 2200 return key_senderror(so, m, EINVAL); 2201 } 2202 2203 id = ((struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY])->sadb_x_policy_id; 2204 2205 /* Is there SP in SPD ? */ 2206 sp = key_getspbyid(id); 2207 if (sp == NULL) { 2208 IPSECLOG(LOG_DEBUG, "no SP found id:%u.\n", id); 2209 return key_senderror(so, m, ENOENT); 2210 } 2211 2212 n = key_setdumpsp(sp, SADB_X_SPDGET, mhp->msg->sadb_msg_seq, 2213 mhp->msg->sadb_msg_pid); 2214 KEY_FREESP(&sp); /* ref gained by key_getspbyid */ 2215 if (n != NULL) { 2216 m_freem(m); 2217 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 2218 } else 2219 return key_senderror(so, m, ENOBUFS); 2220 } 2221 2222 #ifdef notyet 2223 /* 2224 * SADB_X_SPDACQUIRE processing. 2225 * Acquire policy and SA(s) for a *OUTBOUND* packet. 2226 * send 2227 * <base, policy(*)> 2228 * to KMD, and expect to receive 2229 * <base> with SADB_X_SPDACQUIRE if error occurred, 2230 * or 2231 * <base, policy> 2232 * with SADB_X_SPDUPDATE from KMD by PF_KEY. 2233 * policy(*) is without policy requests. 2234 * 2235 * 0 : succeed 2236 * others: error number 2237 */ 2238 int 2239 key_spdacquire(const struct secpolicy *sp) 2240 { 2241 struct mbuf *result = NULL, *m; 2242 struct secspacq *newspacq; 2243 int error; 2244 2245 KASSERT(sp != NULL); 2246 KASSERTMSG(sp->req == NULL, "called but there is request"); 2247 KASSERTMSG(sp->policy == IPSEC_POLICY_IPSEC, 2248 "policy mismathed. IPsec is expected"); 2249 2250 /* Get an entry to check whether sent message or not. */ 2251 newspacq = key_getspacq(&sp->spidx); 2252 if (newspacq != NULL) { 2253 if (key_blockacq_count < newspacq->count) { 2254 /* reset counter and do send message. */ 2255 newspacq->count = 0; 2256 } else { 2257 /* increment counter and do nothing. */ 2258 newspacq->count++; 2259 return 0; 2260 } 2261 } else { 2262 /* make new entry for blocking to send SADB_ACQUIRE. */ 2263 newspacq = key_newspacq(&sp->spidx); 2264 if (newspacq == NULL) 2265 return ENOBUFS; 2266 2267 /* add to acqtree */ 2268 LIST_INSERT_HEAD(&spacqtree, newspacq, chain); 2269 } 2270 2271 /* create new sadb_msg to reply. */ 2272 m = key_setsadbmsg(SADB_X_SPDACQUIRE, 0, 0, 0, 0, 0); 2273 if (!m) { 2274 error = ENOBUFS; 2275 goto fail; 2276 } 2277 result = m; 2278 2279 result->m_pkthdr.len = 0; 2280 for (m = result; m; m = m->m_next) 2281 result->m_pkthdr.len += m->m_len; 2282 2283 mtod(result, struct sadb_msg *)->sadb_msg_len = 2284 PFKEY_UNIT64(result->m_pkthdr.len); 2285 2286 return key_sendup_mbuf(NULL, m, KEY_SENDUP_REGISTERED); 2287 2288 fail: 2289 if (result) 2290 m_freem(result); 2291 return error; 2292 } 2293 #endif /* notyet */ 2294 2295 /* 2296 * SADB_SPDFLUSH processing 2297 * receive 2298 * <base> 2299 * from the user, and free all entries in secpctree. 2300 * and send, 2301 * <base> 2302 * to the user. 2303 * NOTE: what to do is only marking SADB_SASTATE_DEAD. 2304 * 2305 * m will always be freed. 2306 */ 2307 static int 2308 key_api_spdflush(struct socket *so, struct mbuf *m, 2309 const struct sadb_msghdr *mhp) 2310 { 2311 struct sadb_msg *newmsg; 2312 struct secpolicy *sp; 2313 u_int dir; 2314 2315 if (m->m_len != PFKEY_ALIGN8(sizeof(struct sadb_msg))) 2316 return key_senderror(so, m, EINVAL); 2317 2318 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2319 retry: 2320 SPLIST_WRITER_FOREACH(sp, dir) { 2321 if (sp->state == IPSEC_SPSTATE_DEAD) 2322 continue; 2323 key_sp_dead(sp); 2324 key_sp_unlink(sp); 2325 goto retry; 2326 } 2327 } 2328 2329 /* Invalidate all cached SPD pointers in the PCBs. */ 2330 ipsec_invalpcbcacheall(); 2331 2332 /* We're deleting policy; no need to invalidate the ipflow cache. */ 2333 2334 if (sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 2335 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 2336 return key_senderror(so, m, ENOBUFS); 2337 } 2338 2339 if (m->m_next) 2340 m_freem(m->m_next); 2341 m->m_next = NULL; 2342 m->m_pkthdr.len = m->m_len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 2343 newmsg = mtod(m, struct sadb_msg *); 2344 newmsg->sadb_msg_errno = 0; 2345 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 2346 2347 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 2348 } 2349 2350 static struct sockaddr key_src = { 2351 .sa_len = 2, 2352 .sa_family = PF_KEY, 2353 }; 2354 2355 static struct mbuf * 2356 key_setspddump_chain(int *errorp, int *lenp, pid_t pid) 2357 { 2358 struct secpolicy *sp; 2359 int cnt; 2360 u_int dir; 2361 struct mbuf *m, *n, *prev; 2362 int totlen; 2363 2364 *lenp = 0; 2365 2366 /* search SPD entry and get buffer size. */ 2367 cnt = 0; 2368 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2369 SPLIST_READER_FOREACH(sp, dir) { 2370 cnt++; 2371 } 2372 } 2373 2374 if (cnt == 0) { 2375 *errorp = ENOENT; 2376 return (NULL); 2377 } 2378 2379 m = NULL; 2380 prev = m; 2381 totlen = 0; 2382 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 2383 SPLIST_READER_FOREACH(sp, dir) { 2384 --cnt; 2385 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, pid); 2386 2387 if (!n) { 2388 *errorp = ENOBUFS; 2389 if (m) 2390 m_freem(m); 2391 return (NULL); 2392 } 2393 2394 totlen += n->m_pkthdr.len; 2395 if (!m) { 2396 m = n; 2397 } else { 2398 prev->m_nextpkt = n; 2399 } 2400 prev = n; 2401 } 2402 } 2403 2404 *lenp = totlen; 2405 *errorp = 0; 2406 return (m); 2407 } 2408 2409 /* 2410 * SADB_SPDDUMP processing 2411 * receive 2412 * <base> 2413 * from the user, and dump all SP leaves 2414 * and send, 2415 * <base> ..... 2416 * to the ikmpd. 2417 * 2418 * m will always be freed. 2419 */ 2420 static int 2421 key_api_spddump(struct socket *so, struct mbuf *m0, 2422 const struct sadb_msghdr *mhp) 2423 { 2424 struct mbuf *n; 2425 int error, len; 2426 int ok, s; 2427 pid_t pid; 2428 2429 pid = mhp->msg->sadb_msg_pid; 2430 /* 2431 * If the requestor has insufficient socket-buffer space 2432 * for the entire chain, nobody gets any response to the DUMP. 2433 * XXX For now, only the requestor ever gets anything. 2434 * Moreover, if the requestor has any space at all, they receive 2435 * the entire chain, otherwise the request is refused with ENOBUFS. 2436 */ 2437 if (sbspace(&so->so_rcv) <= 0) { 2438 return key_senderror(so, m0, ENOBUFS); 2439 } 2440 2441 s = splsoftnet(); 2442 n = key_setspddump_chain(&error, &len, pid); 2443 splx(s); 2444 2445 if (n == NULL) { 2446 return key_senderror(so, m0, ENOENT); 2447 } 2448 { 2449 uint64_t *ps = PFKEY_STAT_GETREF(); 2450 ps[PFKEY_STAT_IN_TOTAL]++; 2451 ps[PFKEY_STAT_IN_BYTES] += len; 2452 PFKEY_STAT_PUTREF(); 2453 } 2454 2455 /* 2456 * PF_KEY DUMP responses are no longer broadcast to all PF_KEY sockets. 2457 * The requestor receives either the entire chain, or an 2458 * error message with ENOBUFS. 2459 */ 2460 2461 /* 2462 * sbappendchainwith record takes the chain of entries, one 2463 * packet-record per SPD entry, prepends the key_src sockaddr 2464 * to each packet-record, links the sockaddr mbufs into a new 2465 * list of records, then appends the entire resulting 2466 * list to the requesting socket. 2467 */ 2468 ok = sbappendaddrchain(&so->so_rcv, (struct sockaddr *)&key_src, n, 2469 SB_PRIO_ONESHOT_OVERFLOW); 2470 2471 if (!ok) { 2472 PFKEY_STATINC(PFKEY_STAT_IN_NOMEM); 2473 m_freem(n); 2474 return key_senderror(so, m0, ENOBUFS); 2475 } 2476 2477 m_freem(m0); 2478 return error; 2479 } 2480 2481 /* 2482 * SADB_X_NAT_T_NEW_MAPPING. Unused by racoon as of 2005/04/23 2483 */ 2484 static int 2485 key_api_nat_map(struct socket *so, struct mbuf *m, 2486 const struct sadb_msghdr *mhp) 2487 { 2488 struct sadb_x_nat_t_type *type; 2489 struct sadb_x_nat_t_port *sport; 2490 struct sadb_x_nat_t_port *dport; 2491 struct sadb_address *iaddr, *raddr; 2492 struct sadb_x_nat_t_frag *frag; 2493 2494 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] == NULL || 2495 mhp->ext[SADB_X_EXT_NAT_T_SPORT] == NULL || 2496 mhp->ext[SADB_X_EXT_NAT_T_DPORT] == NULL) { 2497 IPSECLOG(LOG_DEBUG, "invalid message.\n"); 2498 return key_senderror(so, m, EINVAL); 2499 } 2500 if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) || 2501 (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) || 2502 (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) { 2503 IPSECLOG(LOG_DEBUG, "invalid message.\n"); 2504 return key_senderror(so, m, EINVAL); 2505 } 2506 2507 if ((mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) && 2508 (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr))) { 2509 IPSECLOG(LOG_DEBUG, "invalid message\n"); 2510 return key_senderror(so, m, EINVAL); 2511 } 2512 2513 if ((mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) && 2514 (mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr))) { 2515 IPSECLOG(LOG_DEBUG, "invalid message\n"); 2516 return key_senderror(so, m, EINVAL); 2517 } 2518 2519 if ((mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) && 2520 (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag))) { 2521 IPSECLOG(LOG_DEBUG, "invalid message\n"); 2522 return key_senderror(so, m, EINVAL); 2523 } 2524 2525 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 2526 sport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 2527 dport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 2528 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 2529 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 2530 frag = (struct sadb_x_nat_t_frag *) mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 2531 2532 /* 2533 * XXX handle that, it should also contain a SA, or anything 2534 * that enable to update the SA information. 2535 */ 2536 2537 return 0; 2538 } 2539 2540 static struct mbuf * 2541 key_setdumpsp(struct secpolicy *sp, u_int8_t type, u_int32_t seq, pid_t pid) 2542 { 2543 struct mbuf *result = NULL, *m; 2544 2545 m = key_setsadbmsg(type, 0, SADB_SATYPE_UNSPEC, seq, pid, 2546 key_sp_refcnt(sp)); 2547 if (!m) 2548 goto fail; 2549 result = m; 2550 2551 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 2552 &sp->spidx.src.sa, sp->spidx.prefs, sp->spidx.ul_proto); 2553 if (!m) 2554 goto fail; 2555 m_cat(result, m); 2556 2557 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 2558 &sp->spidx.dst.sa, sp->spidx.prefd, sp->spidx.ul_proto); 2559 if (!m) 2560 goto fail; 2561 m_cat(result, m); 2562 2563 m = key_sp2msg(sp); 2564 if (!m) 2565 goto fail; 2566 m_cat(result, m); 2567 2568 if ((result->m_flags & M_PKTHDR) == 0) 2569 goto fail; 2570 2571 if (result->m_len < sizeof(struct sadb_msg)) { 2572 result = m_pullup(result, sizeof(struct sadb_msg)); 2573 if (result == NULL) 2574 goto fail; 2575 } 2576 2577 result->m_pkthdr.len = 0; 2578 for (m = result; m; m = m->m_next) 2579 result->m_pkthdr.len += m->m_len; 2580 2581 mtod(result, struct sadb_msg *)->sadb_msg_len = 2582 PFKEY_UNIT64(result->m_pkthdr.len); 2583 2584 return result; 2585 2586 fail: 2587 m_freem(result); 2588 return NULL; 2589 } 2590 2591 /* 2592 * get PFKEY message length for security policy and request. 2593 */ 2594 static u_int 2595 key_getspreqmsglen(const struct secpolicy *sp) 2596 { 2597 u_int tlen; 2598 2599 tlen = sizeof(struct sadb_x_policy); 2600 2601 /* if is the policy for ipsec ? */ 2602 if (sp->policy != IPSEC_POLICY_IPSEC) 2603 return tlen; 2604 2605 /* get length of ipsec requests */ 2606 { 2607 const struct ipsecrequest *isr; 2608 int len; 2609 2610 for (isr = sp->req; isr != NULL; isr = isr->next) { 2611 len = sizeof(struct sadb_x_ipsecrequest) 2612 + isr->saidx.src.sa.sa_len + isr->saidx.dst.sa.sa_len; 2613 2614 tlen += PFKEY_ALIGN8(len); 2615 } 2616 } 2617 2618 return tlen; 2619 } 2620 2621 /* 2622 * SADB_SPDEXPIRE processing 2623 * send 2624 * <base, address(SD), lifetime(CH), policy> 2625 * to KMD by PF_KEY. 2626 * 2627 * OUT: 0 : succeed 2628 * others : error number 2629 */ 2630 static int 2631 key_spdexpire(struct secpolicy *sp) 2632 { 2633 int s; 2634 struct mbuf *result = NULL, *m; 2635 int len; 2636 int error = -1; 2637 struct sadb_lifetime *lt; 2638 2639 /* XXX: Why do we lock ? */ 2640 s = splsoftnet(); /*called from softclock()*/ 2641 2642 KASSERT(sp != NULL); 2643 2644 /* set msg header */ 2645 m = key_setsadbmsg(SADB_X_SPDEXPIRE, 0, 0, 0, 0, 0); 2646 if (!m) { 2647 error = ENOBUFS; 2648 goto fail; 2649 } 2650 result = m; 2651 2652 /* create lifetime extension (current and hard) */ 2653 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 2654 m = key_alloc_mbuf(len); 2655 if (!m || m->m_next) { /*XXX*/ 2656 if (m) 2657 m_freem(m); 2658 error = ENOBUFS; 2659 goto fail; 2660 } 2661 memset(mtod(m, void *), 0, len); 2662 lt = mtod(m, struct sadb_lifetime *); 2663 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2664 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 2665 lt->sadb_lifetime_allocations = 0; 2666 lt->sadb_lifetime_bytes = 0; 2667 lt->sadb_lifetime_addtime = time_mono_to_wall(sp->created); 2668 lt->sadb_lifetime_usetime = time_mono_to_wall(sp->lastused); 2669 lt = (struct sadb_lifetime *)(mtod(m, char *) + len / 2); 2670 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 2671 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; 2672 lt->sadb_lifetime_allocations = 0; 2673 lt->sadb_lifetime_bytes = 0; 2674 lt->sadb_lifetime_addtime = sp->lifetime; 2675 lt->sadb_lifetime_usetime = sp->validtime; 2676 m_cat(result, m); 2677 2678 /* set sadb_address for source */ 2679 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sp->spidx.src.sa, 2680 sp->spidx.prefs, sp->spidx.ul_proto); 2681 if (!m) { 2682 error = ENOBUFS; 2683 goto fail; 2684 } 2685 m_cat(result, m); 2686 2687 /* set sadb_address for destination */ 2688 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sp->spidx.dst.sa, 2689 sp->spidx.prefd, sp->spidx.ul_proto); 2690 if (!m) { 2691 error = ENOBUFS; 2692 goto fail; 2693 } 2694 m_cat(result, m); 2695 2696 /* set secpolicy */ 2697 m = key_sp2msg(sp); 2698 if (!m) { 2699 error = ENOBUFS; 2700 goto fail; 2701 } 2702 m_cat(result, m); 2703 2704 if ((result->m_flags & M_PKTHDR) == 0) { 2705 error = EINVAL; 2706 goto fail; 2707 } 2708 2709 if (result->m_len < sizeof(struct sadb_msg)) { 2710 result = m_pullup(result, sizeof(struct sadb_msg)); 2711 if (result == NULL) { 2712 error = ENOBUFS; 2713 goto fail; 2714 } 2715 } 2716 2717 result->m_pkthdr.len = 0; 2718 for (m = result; m; m = m->m_next) 2719 result->m_pkthdr.len += m->m_len; 2720 2721 mtod(result, struct sadb_msg *)->sadb_msg_len = 2722 PFKEY_UNIT64(result->m_pkthdr.len); 2723 2724 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 2725 2726 fail: 2727 if (result) 2728 m_freem(result); 2729 splx(s); 2730 return error; 2731 } 2732 2733 /* %%% SAD management */ 2734 /* 2735 * allocating a memory for new SA head, and copy from the values of mhp. 2736 * OUT: NULL : failure due to the lack of memory. 2737 * others : pointer to new SA head. 2738 */ 2739 static struct secashead * 2740 key_newsah(const struct secasindex *saidx) 2741 { 2742 struct secashead *newsah; 2743 int i; 2744 2745 KASSERT(saidx != NULL); 2746 2747 newsah = kmem_zalloc(sizeof(struct secashead), KM_SLEEP); 2748 for (i = 0; i < __arraycount(newsah->savtree); i++) 2749 LIST_INIT(&newsah->savtree[i]); 2750 newsah->saidx = *saidx; 2751 2752 /* add to saidxtree */ 2753 newsah->state = SADB_SASTATE_MATURE; 2754 LIST_INSERT_HEAD(&sahtree, newsah, chain); 2755 2756 return newsah; 2757 } 2758 2759 /* 2760 * delete SA index and all SA registerd. 2761 */ 2762 static void 2763 key_delsah(struct secashead *sah) 2764 { 2765 struct secasvar *sav; 2766 u_int state; 2767 int s; 2768 int zombie = 0; 2769 2770 KASSERT(!cpu_softintr_p()); 2771 KASSERT(sah != NULL); 2772 2773 s = splsoftnet(); 2774 2775 /* searching all SA registerd in the secindex. */ 2776 SASTATE_ANY_FOREACH(state) { 2777 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2778 /* give up to delete this sa */ 2779 zombie++; 2780 } 2781 } 2782 2783 /* don't delete sah only if there are savs. */ 2784 if (zombie) { 2785 splx(s); 2786 return; 2787 } 2788 2789 rtcache_free(&sah->sa_route); 2790 2791 /* remove from tree of SA index */ 2792 KASSERT(__LIST_CHAINED(sah)); 2793 LIST_REMOVE(sah, chain); 2794 2795 if (sah->idents != NULL) 2796 kmem_free(sah->idents, sah->idents_len); 2797 if (sah->identd != NULL) 2798 kmem_free(sah->identd, sah->identd_len); 2799 2800 kmem_free(sah, sizeof(*sah)); 2801 2802 splx(s); 2803 return; 2804 } 2805 2806 /* 2807 * allocating a new SA with LARVAL state. 2808 * key_api_add() and key_api_getspi() call, 2809 * and copy the values of mhp into new buffer. 2810 * When SAD message type is GETSPI: 2811 * to set sequence number from acq_seq++, 2812 * to set zero to SPI. 2813 * not to call key_setsava(). 2814 * OUT: NULL : fail 2815 * others : pointer to new secasvar. 2816 * 2817 * does not modify mbuf. does not free mbuf on error. 2818 */ 2819 static struct secasvar * 2820 key_newsav(struct mbuf *m, const struct sadb_msghdr *mhp, 2821 int *errp, const char* where, int tag) 2822 { 2823 struct secasvar *newsav; 2824 const struct sadb_sa *xsa; 2825 2826 KASSERT(!cpu_softintr_p()); 2827 KASSERT(m != NULL); 2828 KASSERT(mhp != NULL); 2829 KASSERT(mhp->msg != NULL); 2830 2831 newsav = kmem_zalloc(sizeof(struct secasvar), KM_SLEEP); 2832 2833 switch (mhp->msg->sadb_msg_type) { 2834 case SADB_GETSPI: 2835 newsav->spi = 0; 2836 2837 #ifdef IPSEC_DOSEQCHECK 2838 /* sync sequence number */ 2839 if (mhp->msg->sadb_msg_seq == 0) 2840 newsav->seq = 2841 (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 2842 else 2843 #endif 2844 newsav->seq = mhp->msg->sadb_msg_seq; 2845 break; 2846 2847 case SADB_ADD: 2848 /* sanity check */ 2849 if (mhp->ext[SADB_EXT_SA] == NULL) { 2850 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 2851 *errp = EINVAL; 2852 goto error; 2853 } 2854 xsa = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 2855 newsav->spi = xsa->sadb_sa_spi; 2856 newsav->seq = mhp->msg->sadb_msg_seq; 2857 break; 2858 default: 2859 *errp = EINVAL; 2860 goto error; 2861 } 2862 2863 /* copy sav values */ 2864 if (mhp->msg->sadb_msg_type != SADB_GETSPI) { 2865 *errp = key_setsaval(newsav, m, mhp); 2866 if (*errp) 2867 goto error; 2868 } 2869 2870 /* reset created */ 2871 newsav->created = time_uptime; 2872 newsav->pid = mhp->msg->sadb_msg_pid; 2873 2874 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 2875 "DP from %s:%u return SA:%p\n", where, tag, newsav); 2876 return newsav; 2877 2878 error: 2879 KASSERT(*errp != 0); 2880 kmem_free(newsav, sizeof(*newsav)); 2881 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 2882 "DP from %s:%u return SA:NULL\n", where, tag); 2883 return NULL; 2884 } 2885 2886 2887 static void 2888 key_clear_xform(struct secasvar *sav) 2889 { 2890 2891 /* 2892 * Cleanup xform state. Note that zeroize'ing causes the 2893 * keys to be cleared; otherwise we must do it ourself. 2894 */ 2895 if (sav->tdb_xform != NULL) { 2896 sav->tdb_xform->xf_zeroize(sav); 2897 sav->tdb_xform = NULL; 2898 } else { 2899 if (sav->key_auth != NULL) 2900 explicit_memset(_KEYBUF(sav->key_auth), 0, 2901 _KEYLEN(sav->key_auth)); 2902 if (sav->key_enc != NULL) 2903 explicit_memset(_KEYBUF(sav->key_enc), 0, 2904 _KEYLEN(sav->key_enc)); 2905 } 2906 } 2907 2908 /* 2909 * free() SA variable entry. 2910 */ 2911 static void 2912 key_delsav(struct secasvar *sav) 2913 { 2914 2915 KASSERT(sav != NULL); 2916 KASSERTMSG(sav->refcnt == 0, "reference count %u > 0", sav->refcnt); 2917 2918 key_clear_xform(sav); 2919 key_freesaval(sav); 2920 kmem_intr_free(sav, sizeof(*sav)); 2921 2922 return; 2923 } 2924 2925 /* 2926 * search SAD. 2927 * OUT: 2928 * NULL : not found 2929 * others : found, pointer to a SA. 2930 */ 2931 static struct secashead * 2932 key_getsah(const struct secasindex *saidx, int flag) 2933 { 2934 struct secashead *sah; 2935 2936 LIST_FOREACH(sah, &sahtree, chain) { 2937 if (sah->state == SADB_SASTATE_DEAD) 2938 continue; 2939 if (key_saidx_match(&sah->saidx, saidx, flag)) 2940 return sah; 2941 } 2942 2943 return NULL; 2944 } 2945 2946 /* 2947 * check not to be duplicated SPI. 2948 * NOTE: this function is too slow due to searching all SAD. 2949 * OUT: 2950 * NULL : not found 2951 * others : found, pointer to a SA. 2952 */ 2953 static bool 2954 key_checkspidup(const struct secasindex *saidx, u_int32_t spi) 2955 { 2956 struct secashead *sah; 2957 struct secasvar *sav; 2958 2959 /* check address family */ 2960 if (saidx->src.sa.sa_family != saidx->dst.sa.sa_family) { 2961 IPSECLOG(LOG_DEBUG, "address family mismatched.\n"); 2962 return false; 2963 } 2964 2965 /* check all SAD */ 2966 LIST_FOREACH(sah, &sahtree, chain) { 2967 if (!key_ismyaddr((struct sockaddr *)&sah->saidx.dst)) 2968 continue; 2969 sav = key_getsavbyspi(sah, spi); 2970 if (sav != NULL) { 2971 KEY_FREESAV(&sav); 2972 return true; 2973 } 2974 } 2975 2976 return false; 2977 } 2978 2979 /* 2980 * search SAD litmited alive SA, protocol, SPI. 2981 * OUT: 2982 * NULL : not found 2983 * others : found, pointer to a SA. 2984 */ 2985 static struct secasvar * 2986 key_getsavbyspi(struct secashead *sah, u_int32_t spi) 2987 { 2988 struct secasvar *sav; 2989 u_int state; 2990 2991 /* search all status */ 2992 SASTATE_ALIVE_FOREACH(state) { 2993 LIST_FOREACH(sav, &sah->savtree[state], chain) { 2994 2995 /* sanity check */ 2996 if (sav->state != state) { 2997 IPSECLOG(LOG_DEBUG, 2998 "invalid sav->state (queue: %d SA: %d)\n", 2999 state, sav->state); 3000 continue; 3001 } 3002 3003 if (sav->spi == spi) { 3004 SA_ADDREF(sav); 3005 return sav; 3006 } 3007 } 3008 } 3009 3010 return NULL; 3011 } 3012 3013 /* 3014 * Free allocated data to member variables of sav: 3015 * sav->replay, sav->key_* and sav->lft_*. 3016 */ 3017 static void 3018 key_freesaval(struct secasvar *sav) 3019 { 3020 3021 KASSERT(sav->refcnt == 0); 3022 3023 if (sav->replay != NULL) 3024 kmem_intr_free(sav->replay, sav->replay_len); 3025 if (sav->key_auth != NULL) 3026 kmem_intr_free(sav->key_auth, sav->key_auth_len); 3027 if (sav->key_enc != NULL) 3028 kmem_intr_free(sav->key_enc, sav->key_enc_len); 3029 if (sav->lft_c != NULL) 3030 kmem_intr_free(sav->lft_c, sizeof(*(sav->lft_c))); 3031 if (sav->lft_h != NULL) 3032 kmem_intr_free(sav->lft_h, sizeof(*(sav->lft_h))); 3033 if (sav->lft_s != NULL) 3034 kmem_intr_free(sav->lft_s, sizeof(*(sav->lft_s))); 3035 } 3036 3037 /* 3038 * copy SA values from PF_KEY message except *SPI, SEQ, PID, STATE and TYPE*. 3039 * You must update these if need. 3040 * OUT: 0: success. 3041 * !0: failure. 3042 * 3043 * does not modify mbuf. does not free mbuf on error. 3044 */ 3045 static int 3046 key_setsaval(struct secasvar *sav, struct mbuf *m, 3047 const struct sadb_msghdr *mhp) 3048 { 3049 int error = 0; 3050 3051 KASSERT(!cpu_softintr_p()); 3052 KASSERT(m != NULL); 3053 KASSERT(mhp != NULL); 3054 KASSERT(mhp->msg != NULL); 3055 3056 /* We shouldn't initialize sav variables while someone uses it. */ 3057 KASSERT(sav->refcnt == 0); 3058 3059 /* SA */ 3060 if (mhp->ext[SADB_EXT_SA] != NULL) { 3061 const struct sadb_sa *sa0; 3062 3063 sa0 = (const struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 3064 if (mhp->extlen[SADB_EXT_SA] < sizeof(*sa0)) { 3065 error = EINVAL; 3066 goto fail; 3067 } 3068 3069 sav->alg_auth = sa0->sadb_sa_auth; 3070 sav->alg_enc = sa0->sadb_sa_encrypt; 3071 sav->flags = sa0->sadb_sa_flags; 3072 3073 /* replay window */ 3074 if ((sa0->sadb_sa_flags & SADB_X_EXT_OLD) == 0) { 3075 size_t len = sizeof(struct secreplay) + 3076 sa0->sadb_sa_replay; 3077 sav->replay = kmem_zalloc(len, KM_SLEEP); 3078 sav->replay_len = len; 3079 if (sa0->sadb_sa_replay != 0) 3080 sav->replay->bitmap = (char*)(sav->replay+1); 3081 sav->replay->wsize = sa0->sadb_sa_replay; 3082 } 3083 } 3084 3085 /* Authentication keys */ 3086 if (mhp->ext[SADB_EXT_KEY_AUTH] != NULL) { 3087 const struct sadb_key *key0; 3088 int len; 3089 3090 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_AUTH]; 3091 len = mhp->extlen[SADB_EXT_KEY_AUTH]; 3092 3093 error = 0; 3094 if (len < sizeof(*key0)) { 3095 error = EINVAL; 3096 goto fail; 3097 } 3098 switch (mhp->msg->sadb_msg_satype) { 3099 case SADB_SATYPE_AH: 3100 case SADB_SATYPE_ESP: 3101 case SADB_X_SATYPE_TCPSIGNATURE: 3102 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3103 sav->alg_auth != SADB_X_AALG_NULL) 3104 error = EINVAL; 3105 break; 3106 case SADB_X_SATYPE_IPCOMP: 3107 default: 3108 error = EINVAL; 3109 break; 3110 } 3111 if (error) { 3112 IPSECLOG(LOG_DEBUG, "invalid key_auth values.\n"); 3113 goto fail; 3114 } 3115 3116 sav->key_auth = key_newbuf(key0, len); 3117 sav->key_auth_len = len; 3118 } 3119 3120 /* Encryption key */ 3121 if (mhp->ext[SADB_EXT_KEY_ENCRYPT] != NULL) { 3122 const struct sadb_key *key0; 3123 int len; 3124 3125 key0 = (const struct sadb_key *)mhp->ext[SADB_EXT_KEY_ENCRYPT]; 3126 len = mhp->extlen[SADB_EXT_KEY_ENCRYPT]; 3127 3128 error = 0; 3129 if (len < sizeof(*key0)) { 3130 error = EINVAL; 3131 goto fail; 3132 } 3133 switch (mhp->msg->sadb_msg_satype) { 3134 case SADB_SATYPE_ESP: 3135 if (len == PFKEY_ALIGN8(sizeof(struct sadb_key)) && 3136 sav->alg_enc != SADB_EALG_NULL) { 3137 error = EINVAL; 3138 break; 3139 } 3140 sav->key_enc = key_newbuf(key0, len); 3141 sav->key_enc_len = len; 3142 break; 3143 case SADB_X_SATYPE_IPCOMP: 3144 if (len != PFKEY_ALIGN8(sizeof(struct sadb_key))) 3145 error = EINVAL; 3146 sav->key_enc = NULL; /*just in case*/ 3147 break; 3148 case SADB_SATYPE_AH: 3149 case SADB_X_SATYPE_TCPSIGNATURE: 3150 default: 3151 error = EINVAL; 3152 break; 3153 } 3154 if (error) { 3155 IPSECLOG(LOG_DEBUG, "invalid key_enc value.\n"); 3156 goto fail; 3157 } 3158 } 3159 3160 /* set iv */ 3161 sav->ivlen = 0; 3162 3163 switch (mhp->msg->sadb_msg_satype) { 3164 case SADB_SATYPE_AH: 3165 error = xform_init(sav, XF_AH); 3166 break; 3167 case SADB_SATYPE_ESP: 3168 error = xform_init(sav, XF_ESP); 3169 break; 3170 case SADB_X_SATYPE_IPCOMP: 3171 error = xform_init(sav, XF_IPCOMP); 3172 break; 3173 case SADB_X_SATYPE_TCPSIGNATURE: 3174 error = xform_init(sav, XF_TCPSIGNATURE); 3175 break; 3176 } 3177 if (error) { 3178 IPSECLOG(LOG_DEBUG, "unable to initialize SA type %u.\n", 3179 mhp->msg->sadb_msg_satype); 3180 goto fail; 3181 } 3182 3183 /* reset created */ 3184 sav->created = time_uptime; 3185 3186 /* make lifetime for CURRENT */ 3187 sav->lft_c = kmem_alloc(sizeof(struct sadb_lifetime), KM_SLEEP); 3188 3189 sav->lft_c->sadb_lifetime_len = 3190 PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 3191 sav->lft_c->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 3192 sav->lft_c->sadb_lifetime_allocations = 0; 3193 sav->lft_c->sadb_lifetime_bytes = 0; 3194 sav->lft_c->sadb_lifetime_addtime = time_uptime; 3195 sav->lft_c->sadb_lifetime_usetime = 0; 3196 3197 /* lifetimes for HARD and SOFT */ 3198 { 3199 const struct sadb_lifetime *lft0; 3200 3201 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_HARD]; 3202 if (lft0 != NULL) { 3203 if (mhp->extlen[SADB_EXT_LIFETIME_HARD] < sizeof(*lft0)) { 3204 error = EINVAL; 3205 goto fail; 3206 } 3207 sav->lft_h = key_newbuf(lft0, sizeof(*lft0)); 3208 } 3209 3210 lft0 = (struct sadb_lifetime *)mhp->ext[SADB_EXT_LIFETIME_SOFT]; 3211 if (lft0 != NULL) { 3212 if (mhp->extlen[SADB_EXT_LIFETIME_SOFT] < sizeof(*lft0)) { 3213 error = EINVAL; 3214 goto fail; 3215 } 3216 sav->lft_s = key_newbuf(lft0, sizeof(*lft0)); 3217 /* to be initialize ? */ 3218 } 3219 } 3220 3221 return 0; 3222 3223 fail: 3224 key_clear_xform(sav); 3225 key_freesaval(sav); 3226 3227 return error; 3228 } 3229 3230 /* 3231 * validation with a secasvar entry, and set SADB_SATYPE_MATURE. 3232 * OUT: 0: valid 3233 * other: errno 3234 */ 3235 static int 3236 key_init_xform(struct secasvar *sav) 3237 { 3238 int error; 3239 3240 /* We shouldn't initialize sav variables while someone uses it. */ 3241 KASSERT(sav->refcnt == 0); 3242 3243 /* check SPI value */ 3244 switch (sav->sah->saidx.proto) { 3245 case IPPROTO_ESP: 3246 case IPPROTO_AH: 3247 if (ntohl(sav->spi) <= 255) { 3248 IPSECLOG(LOG_DEBUG, "illegal range of SPI %u.\n", 3249 (u_int32_t)ntohl(sav->spi)); 3250 return EINVAL; 3251 } 3252 break; 3253 } 3254 3255 /* check satype */ 3256 switch (sav->sah->saidx.proto) { 3257 case IPPROTO_ESP: 3258 /* check flags */ 3259 if ((sav->flags & (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) == 3260 (SADB_X_EXT_OLD|SADB_X_EXT_DERIV)) { 3261 IPSECLOG(LOG_DEBUG, 3262 "invalid flag (derived) given to old-esp.\n"); 3263 return EINVAL; 3264 } 3265 error = xform_init(sav, XF_ESP); 3266 break; 3267 case IPPROTO_AH: 3268 /* check flags */ 3269 if (sav->flags & SADB_X_EXT_DERIV) { 3270 IPSECLOG(LOG_DEBUG, 3271 "invalid flag (derived) given to AH SA.\n"); 3272 return EINVAL; 3273 } 3274 if (sav->alg_enc != SADB_EALG_NONE) { 3275 IPSECLOG(LOG_DEBUG, 3276 "protocol and algorithm mismated.\n"); 3277 return(EINVAL); 3278 } 3279 error = xform_init(sav, XF_AH); 3280 break; 3281 case IPPROTO_IPCOMP: 3282 if (sav->alg_auth != SADB_AALG_NONE) { 3283 IPSECLOG(LOG_DEBUG, 3284 "protocol and algorithm mismated.\n"); 3285 return(EINVAL); 3286 } 3287 if ((sav->flags & SADB_X_EXT_RAWCPI) == 0 3288 && ntohl(sav->spi) >= 0x10000) { 3289 IPSECLOG(LOG_DEBUG, "invalid cpi for IPComp.\n"); 3290 return(EINVAL); 3291 } 3292 error = xform_init(sav, XF_IPCOMP); 3293 break; 3294 case IPPROTO_TCP: 3295 if (sav->alg_enc != SADB_EALG_NONE) { 3296 IPSECLOG(LOG_DEBUG, 3297 "protocol and algorithm mismated.\n"); 3298 return(EINVAL); 3299 } 3300 error = xform_init(sav, XF_TCPSIGNATURE); 3301 break; 3302 default: 3303 IPSECLOG(LOG_DEBUG, "Invalid satype.\n"); 3304 error = EPROTONOSUPPORT; 3305 break; 3306 } 3307 3308 return error; 3309 } 3310 3311 /* 3312 * subroutine for SADB_GET and SADB_DUMP. 3313 */ 3314 static struct mbuf * 3315 key_setdumpsa(struct secasvar *sav, u_int8_t type, u_int8_t satype, 3316 u_int32_t seq, u_int32_t pid) 3317 { 3318 struct mbuf *result = NULL, *tres = NULL, *m; 3319 int l = 0; 3320 int i; 3321 void *p; 3322 struct sadb_lifetime lt; 3323 int dumporder[] = { 3324 SADB_EXT_SA, SADB_X_EXT_SA2, 3325 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 3326 SADB_EXT_LIFETIME_CURRENT, SADB_EXT_ADDRESS_SRC, 3327 SADB_EXT_ADDRESS_DST, SADB_EXT_ADDRESS_PROXY, SADB_EXT_KEY_AUTH, 3328 SADB_EXT_KEY_ENCRYPT, SADB_EXT_IDENTITY_SRC, 3329 SADB_EXT_IDENTITY_DST, SADB_EXT_SENSITIVITY, 3330 SADB_X_EXT_NAT_T_TYPE, 3331 SADB_X_EXT_NAT_T_SPORT, SADB_X_EXT_NAT_T_DPORT, 3332 SADB_X_EXT_NAT_T_OAI, SADB_X_EXT_NAT_T_OAR, 3333 SADB_X_EXT_NAT_T_FRAG, 3334 3335 }; 3336 3337 m = key_setsadbmsg(type, 0, satype, seq, pid, sav->refcnt); 3338 if (m == NULL) 3339 goto fail; 3340 result = m; 3341 3342 for (i = __arraycount(dumporder) - 1; i >= 0; i--) { 3343 m = NULL; 3344 p = NULL; 3345 switch (dumporder[i]) { 3346 case SADB_EXT_SA: 3347 m = key_setsadbsa(sav); 3348 break; 3349 3350 case SADB_X_EXT_SA2: 3351 m = key_setsadbxsa2(sav->sah->saidx.mode, 3352 sav->replay ? sav->replay->count : 0, 3353 sav->sah->saidx.reqid); 3354 break; 3355 3356 case SADB_EXT_ADDRESS_SRC: 3357 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, 3358 &sav->sah->saidx.src.sa, 3359 FULLMASK, IPSEC_ULPROTO_ANY); 3360 break; 3361 3362 case SADB_EXT_ADDRESS_DST: 3363 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, 3364 &sav->sah->saidx.dst.sa, 3365 FULLMASK, IPSEC_ULPROTO_ANY); 3366 break; 3367 3368 case SADB_EXT_KEY_AUTH: 3369 if (!sav->key_auth) 3370 continue; 3371 l = PFKEY_UNUNIT64(sav->key_auth->sadb_key_len); 3372 p = sav->key_auth; 3373 break; 3374 3375 case SADB_EXT_KEY_ENCRYPT: 3376 if (!sav->key_enc) 3377 continue; 3378 l = PFKEY_UNUNIT64(sav->key_enc->sadb_key_len); 3379 p = sav->key_enc; 3380 break; 3381 3382 case SADB_EXT_LIFETIME_CURRENT: 3383 KASSERT(sav->lft_c != NULL); 3384 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_c)->sadb_ext_len); 3385 memcpy(<, sav->lft_c, sizeof(struct sadb_lifetime)); 3386 lt.sadb_lifetime_addtime = 3387 time_mono_to_wall(lt.sadb_lifetime_addtime); 3388 lt.sadb_lifetime_usetime = 3389 time_mono_to_wall(lt.sadb_lifetime_usetime); 3390 p = < 3391 break; 3392 3393 case SADB_EXT_LIFETIME_HARD: 3394 if (!sav->lft_h) 3395 continue; 3396 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_h)->sadb_ext_len); 3397 p = sav->lft_h; 3398 break; 3399 3400 case SADB_EXT_LIFETIME_SOFT: 3401 if (!sav->lft_s) 3402 continue; 3403 l = PFKEY_UNUNIT64(((struct sadb_ext *)sav->lft_s)->sadb_ext_len); 3404 p = sav->lft_s; 3405 break; 3406 3407 case SADB_X_EXT_NAT_T_TYPE: 3408 m = key_setsadbxtype(sav->natt_type); 3409 break; 3410 3411 case SADB_X_EXT_NAT_T_DPORT: 3412 if (sav->natt_type == 0) 3413 continue; 3414 m = key_setsadbxport( 3415 key_portfromsaddr(&sav->sah->saidx.dst), 3416 SADB_X_EXT_NAT_T_DPORT); 3417 break; 3418 3419 case SADB_X_EXT_NAT_T_SPORT: 3420 if (sav->natt_type == 0) 3421 continue; 3422 m = key_setsadbxport( 3423 key_portfromsaddr(&sav->sah->saidx.src), 3424 SADB_X_EXT_NAT_T_SPORT); 3425 break; 3426 3427 case SADB_X_EXT_NAT_T_FRAG: 3428 /* don't send frag info if not set */ 3429 if (sav->natt_type == 0 || sav->esp_frag == IP_MAXPACKET) 3430 continue; 3431 m = key_setsadbxfrag(sav->esp_frag); 3432 break; 3433 3434 case SADB_X_EXT_NAT_T_OAI: 3435 case SADB_X_EXT_NAT_T_OAR: 3436 continue; 3437 3438 case SADB_EXT_ADDRESS_PROXY: 3439 case SADB_EXT_IDENTITY_SRC: 3440 case SADB_EXT_IDENTITY_DST: 3441 /* XXX: should we brought from SPD ? */ 3442 case SADB_EXT_SENSITIVITY: 3443 default: 3444 continue; 3445 } 3446 3447 KASSERT(!(m && p)); 3448 if (!m && !p) 3449 goto fail; 3450 if (p && tres) { 3451 M_PREPEND(tres, l, M_DONTWAIT); 3452 if (!tres) 3453 goto fail; 3454 memcpy(mtod(tres, void *), p, l); 3455 continue; 3456 } 3457 if (p) { 3458 m = key_alloc_mbuf(l); 3459 if (!m) 3460 goto fail; 3461 m_copyback(m, 0, l, p); 3462 } 3463 3464 if (tres) 3465 m_cat(m, tres); 3466 tres = m; 3467 } 3468 3469 m_cat(result, tres); 3470 tres = NULL; /* avoid free on error below */ 3471 3472 if (result->m_len < sizeof(struct sadb_msg)) { 3473 result = m_pullup(result, sizeof(struct sadb_msg)); 3474 if (result == NULL) 3475 goto fail; 3476 } 3477 3478 result->m_pkthdr.len = 0; 3479 for (m = result; m; m = m->m_next) 3480 result->m_pkthdr.len += m->m_len; 3481 3482 mtod(result, struct sadb_msg *)->sadb_msg_len = 3483 PFKEY_UNIT64(result->m_pkthdr.len); 3484 3485 return result; 3486 3487 fail: 3488 m_freem(result); 3489 m_freem(tres); 3490 return NULL; 3491 } 3492 3493 3494 /* 3495 * set a type in sadb_x_nat_t_type 3496 */ 3497 static struct mbuf * 3498 key_setsadbxtype(u_int16_t type) 3499 { 3500 struct mbuf *m; 3501 size_t len; 3502 struct sadb_x_nat_t_type *p; 3503 3504 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_type)); 3505 3506 m = key_alloc_mbuf(len); 3507 if (!m || m->m_next) { /*XXX*/ 3508 if (m) 3509 m_freem(m); 3510 return NULL; 3511 } 3512 3513 p = mtod(m, struct sadb_x_nat_t_type *); 3514 3515 memset(p, 0, len); 3516 p->sadb_x_nat_t_type_len = PFKEY_UNIT64(len); 3517 p->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; 3518 p->sadb_x_nat_t_type_type = type; 3519 3520 return m; 3521 } 3522 /* 3523 * set a port in sadb_x_nat_t_port. port is in network order 3524 */ 3525 static struct mbuf * 3526 key_setsadbxport(u_int16_t port, u_int16_t type) 3527 { 3528 struct mbuf *m; 3529 size_t len; 3530 struct sadb_x_nat_t_port *p; 3531 3532 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_port)); 3533 3534 m = key_alloc_mbuf(len); 3535 if (!m || m->m_next) { /*XXX*/ 3536 if (m) 3537 m_freem(m); 3538 return NULL; 3539 } 3540 3541 p = mtod(m, struct sadb_x_nat_t_port *); 3542 3543 memset(p, 0, len); 3544 p->sadb_x_nat_t_port_len = PFKEY_UNIT64(len); 3545 p->sadb_x_nat_t_port_exttype = type; 3546 p->sadb_x_nat_t_port_port = port; 3547 3548 return m; 3549 } 3550 3551 /* 3552 * set fragmentation info in sadb_x_nat_t_frag 3553 */ 3554 static struct mbuf * 3555 key_setsadbxfrag(u_int16_t flen) 3556 { 3557 struct mbuf *m; 3558 size_t len; 3559 struct sadb_x_nat_t_frag *p; 3560 3561 len = PFKEY_ALIGN8(sizeof(struct sadb_x_nat_t_frag)); 3562 3563 m = key_alloc_mbuf(len); 3564 if (!m || m->m_next) { /*XXX*/ 3565 if (m) 3566 m_freem(m); 3567 return NULL; 3568 } 3569 3570 p = mtod(m, struct sadb_x_nat_t_frag *); 3571 3572 memset(p, 0, len); 3573 p->sadb_x_nat_t_frag_len = PFKEY_UNIT64(len); 3574 p->sadb_x_nat_t_frag_exttype = SADB_X_EXT_NAT_T_FRAG; 3575 p->sadb_x_nat_t_frag_fraglen = flen; 3576 3577 return m; 3578 } 3579 3580 /* 3581 * Get port from sockaddr, port is in network order 3582 */ 3583 u_int16_t 3584 key_portfromsaddr(const union sockaddr_union *saddr) 3585 { 3586 u_int16_t port; 3587 3588 switch (saddr->sa.sa_family) { 3589 case AF_INET: { 3590 port = saddr->sin.sin_port; 3591 break; 3592 } 3593 #ifdef INET6 3594 case AF_INET6: { 3595 port = saddr->sin6.sin6_port; 3596 break; 3597 } 3598 #endif 3599 default: 3600 printf("%s: unexpected address family\n", __func__); 3601 port = 0; 3602 break; 3603 } 3604 3605 return port; 3606 } 3607 3608 3609 /* 3610 * Set port is struct sockaddr. port is in network order 3611 */ 3612 static void 3613 key_porttosaddr(union sockaddr_union *saddr, u_int16_t port) 3614 { 3615 switch (saddr->sa.sa_family) { 3616 case AF_INET: { 3617 saddr->sin.sin_port = port; 3618 break; 3619 } 3620 #ifdef INET6 3621 case AF_INET6: { 3622 saddr->sin6.sin6_port = port; 3623 break; 3624 } 3625 #endif 3626 default: 3627 printf("%s: unexpected address family %d\n", __func__, 3628 saddr->sa.sa_family); 3629 break; 3630 } 3631 3632 return; 3633 } 3634 3635 /* 3636 * Safety check sa_len 3637 */ 3638 static int 3639 key_checksalen(const union sockaddr_union *saddr) 3640 { 3641 switch (saddr->sa.sa_family) { 3642 case AF_INET: 3643 if (saddr->sa.sa_len != sizeof(struct sockaddr_in)) 3644 return -1; 3645 break; 3646 #ifdef INET6 3647 case AF_INET6: 3648 if (saddr->sa.sa_len != sizeof(struct sockaddr_in6)) 3649 return -1; 3650 break; 3651 #endif 3652 default: 3653 printf("%s: unexpected sa_family %d\n", __func__, 3654 saddr->sa.sa_family); 3655 return -1; 3656 break; 3657 } 3658 return 0; 3659 } 3660 3661 3662 /* 3663 * set data into sadb_msg. 3664 */ 3665 static struct mbuf * 3666 key_setsadbmsg(u_int8_t type, u_int16_t tlen, u_int8_t satype, 3667 u_int32_t seq, pid_t pid, u_int16_t reserved) 3668 { 3669 struct mbuf *m; 3670 struct sadb_msg *p; 3671 int len; 3672 3673 CTASSERT(PFKEY_ALIGN8(sizeof(struct sadb_msg)) <= MCLBYTES); 3674 3675 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)); 3676 3677 MGETHDR(m, M_DONTWAIT, MT_DATA); 3678 if (m && len > MHLEN) { 3679 MCLGET(m, M_DONTWAIT); 3680 if ((m->m_flags & M_EXT) == 0) { 3681 m_freem(m); 3682 m = NULL; 3683 } 3684 } 3685 if (!m) 3686 return NULL; 3687 m->m_pkthdr.len = m->m_len = len; 3688 m->m_next = NULL; 3689 3690 p = mtod(m, struct sadb_msg *); 3691 3692 memset(p, 0, len); 3693 p->sadb_msg_version = PF_KEY_V2; 3694 p->sadb_msg_type = type; 3695 p->sadb_msg_errno = 0; 3696 p->sadb_msg_satype = satype; 3697 p->sadb_msg_len = PFKEY_UNIT64(tlen); 3698 p->sadb_msg_reserved = reserved; 3699 p->sadb_msg_seq = seq; 3700 p->sadb_msg_pid = (u_int32_t)pid; 3701 3702 return m; 3703 } 3704 3705 /* 3706 * copy secasvar data into sadb_address. 3707 */ 3708 static struct mbuf * 3709 key_setsadbsa(struct secasvar *sav) 3710 { 3711 struct mbuf *m; 3712 struct sadb_sa *p; 3713 int len; 3714 3715 len = PFKEY_ALIGN8(sizeof(struct sadb_sa)); 3716 m = key_alloc_mbuf(len); 3717 if (!m || m->m_next) { /*XXX*/ 3718 if (m) 3719 m_freem(m); 3720 return NULL; 3721 } 3722 3723 p = mtod(m, struct sadb_sa *); 3724 3725 memset(p, 0, len); 3726 p->sadb_sa_len = PFKEY_UNIT64(len); 3727 p->sadb_sa_exttype = SADB_EXT_SA; 3728 p->sadb_sa_spi = sav->spi; 3729 p->sadb_sa_replay = (sav->replay != NULL ? sav->replay->wsize : 0); 3730 p->sadb_sa_state = sav->state; 3731 p->sadb_sa_auth = sav->alg_auth; 3732 p->sadb_sa_encrypt = sav->alg_enc; 3733 p->sadb_sa_flags = sav->flags; 3734 3735 return m; 3736 } 3737 3738 /* 3739 * set data into sadb_address. 3740 */ 3741 static struct mbuf * 3742 key_setsadbaddr(u_int16_t exttype, const struct sockaddr *saddr, 3743 u_int8_t prefixlen, u_int16_t ul_proto) 3744 { 3745 struct mbuf *m; 3746 struct sadb_address *p; 3747 size_t len; 3748 3749 len = PFKEY_ALIGN8(sizeof(struct sadb_address)) + 3750 PFKEY_ALIGN8(saddr->sa_len); 3751 m = key_alloc_mbuf(len); 3752 if (!m || m->m_next) { /*XXX*/ 3753 if (m) 3754 m_freem(m); 3755 return NULL; 3756 } 3757 3758 p = mtod(m, struct sadb_address *); 3759 3760 memset(p, 0, len); 3761 p->sadb_address_len = PFKEY_UNIT64(len); 3762 p->sadb_address_exttype = exttype; 3763 p->sadb_address_proto = ul_proto; 3764 if (prefixlen == FULLMASK) { 3765 switch (saddr->sa_family) { 3766 case AF_INET: 3767 prefixlen = sizeof(struct in_addr) << 3; 3768 break; 3769 case AF_INET6: 3770 prefixlen = sizeof(struct in6_addr) << 3; 3771 break; 3772 default: 3773 ; /*XXX*/ 3774 } 3775 } 3776 p->sadb_address_prefixlen = prefixlen; 3777 p->sadb_address_reserved = 0; 3778 3779 memcpy(mtod(m, char *) + PFKEY_ALIGN8(sizeof(struct sadb_address)), 3780 saddr, saddr->sa_len); 3781 3782 return m; 3783 } 3784 3785 #if 0 3786 /* 3787 * set data into sadb_ident. 3788 */ 3789 static struct mbuf * 3790 key_setsadbident(u_int16_t exttype, u_int16_t idtype, 3791 void *string, int stringlen, u_int64_t id) 3792 { 3793 struct mbuf *m; 3794 struct sadb_ident *p; 3795 size_t len; 3796 3797 len = PFKEY_ALIGN8(sizeof(struct sadb_ident)) + PFKEY_ALIGN8(stringlen); 3798 m = key_alloc_mbuf(len); 3799 if (!m || m->m_next) { /*XXX*/ 3800 if (m) 3801 m_freem(m); 3802 return NULL; 3803 } 3804 3805 p = mtod(m, struct sadb_ident *); 3806 3807 memset(p, 0, len); 3808 p->sadb_ident_len = PFKEY_UNIT64(len); 3809 p->sadb_ident_exttype = exttype; 3810 p->sadb_ident_type = idtype; 3811 p->sadb_ident_reserved = 0; 3812 p->sadb_ident_id = id; 3813 3814 memcpy(mtod(m, void *) + PFKEY_ALIGN8(sizeof(struct sadb_ident)), 3815 string, stringlen); 3816 3817 return m; 3818 } 3819 #endif 3820 3821 /* 3822 * set data into sadb_x_sa2. 3823 */ 3824 static struct mbuf * 3825 key_setsadbxsa2(u_int8_t mode, u_int32_t seq, u_int16_t reqid) 3826 { 3827 struct mbuf *m; 3828 struct sadb_x_sa2 *p; 3829 size_t len; 3830 3831 len = PFKEY_ALIGN8(sizeof(struct sadb_x_sa2)); 3832 m = key_alloc_mbuf(len); 3833 if (!m || m->m_next) { /*XXX*/ 3834 if (m) 3835 m_freem(m); 3836 return NULL; 3837 } 3838 3839 p = mtod(m, struct sadb_x_sa2 *); 3840 3841 memset(p, 0, len); 3842 p->sadb_x_sa2_len = PFKEY_UNIT64(len); 3843 p->sadb_x_sa2_exttype = SADB_X_EXT_SA2; 3844 p->sadb_x_sa2_mode = mode; 3845 p->sadb_x_sa2_reserved1 = 0; 3846 p->sadb_x_sa2_reserved2 = 0; 3847 p->sadb_x_sa2_sequence = seq; 3848 p->sadb_x_sa2_reqid = reqid; 3849 3850 return m; 3851 } 3852 3853 /* 3854 * set data into sadb_x_policy 3855 */ 3856 static struct mbuf * 3857 key_setsadbxpolicy(u_int16_t type, u_int8_t dir, u_int32_t id) 3858 { 3859 struct mbuf *m; 3860 struct sadb_x_policy *p; 3861 size_t len; 3862 3863 len = PFKEY_ALIGN8(sizeof(struct sadb_x_policy)); 3864 m = key_alloc_mbuf(len); 3865 if (!m || m->m_next) { /*XXX*/ 3866 if (m) 3867 m_freem(m); 3868 return NULL; 3869 } 3870 3871 p = mtod(m, struct sadb_x_policy *); 3872 3873 memset(p, 0, len); 3874 p->sadb_x_policy_len = PFKEY_UNIT64(len); 3875 p->sadb_x_policy_exttype = SADB_X_EXT_POLICY; 3876 p->sadb_x_policy_type = type; 3877 p->sadb_x_policy_dir = dir; 3878 p->sadb_x_policy_id = id; 3879 3880 return m; 3881 } 3882 3883 /* %%% utilities */ 3884 /* 3885 * copy a buffer into the new buffer allocated. 3886 */ 3887 static void * 3888 key_newbuf(const void *src, u_int len) 3889 { 3890 void *new; 3891 3892 new = kmem_alloc(len, KM_SLEEP); 3893 memcpy(new, src, len); 3894 3895 return new; 3896 } 3897 3898 /* compare my own address 3899 * OUT: 1: true, i.e. my address. 3900 * 0: false 3901 */ 3902 int 3903 key_ismyaddr(const struct sockaddr *sa) 3904 { 3905 #ifdef INET 3906 const struct sockaddr_in *sin; 3907 const struct in_ifaddr *ia; 3908 int s; 3909 #endif 3910 3911 KASSERT(sa != NULL); 3912 3913 switch (sa->sa_family) { 3914 #ifdef INET 3915 case AF_INET: 3916 sin = (const struct sockaddr_in *)sa; 3917 s = pserialize_read_enter(); 3918 IN_ADDRLIST_READER_FOREACH(ia) { 3919 if (sin->sin_family == ia->ia_addr.sin_family && 3920 sin->sin_len == ia->ia_addr.sin_len && 3921 sin->sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr) 3922 { 3923 pserialize_read_exit(s); 3924 return 1; 3925 } 3926 } 3927 pserialize_read_exit(s); 3928 break; 3929 #endif 3930 #ifdef INET6 3931 case AF_INET6: 3932 return key_ismyaddr6((const struct sockaddr_in6 *)sa); 3933 #endif 3934 } 3935 3936 return 0; 3937 } 3938 3939 #ifdef INET6 3940 /* 3941 * compare my own address for IPv6. 3942 * 1: ours 3943 * 0: other 3944 * NOTE: derived ip6_input() in KAME. This is necessary to modify more. 3945 */ 3946 #include <netinet6/in6_var.h> 3947 3948 static int 3949 key_ismyaddr6(const struct sockaddr_in6 *sin6) 3950 { 3951 struct in6_ifaddr *ia; 3952 int s; 3953 struct psref psref; 3954 int bound; 3955 int ours = 1; 3956 3957 bound = curlwp_bind(); 3958 s = pserialize_read_enter(); 3959 IN6_ADDRLIST_READER_FOREACH(ia) { 3960 bool ingroup; 3961 3962 if (key_sockaddr_match((const struct sockaddr *)&sin6, 3963 (const struct sockaddr *)&ia->ia_addr, 0)) { 3964 pserialize_read_exit(s); 3965 goto ours; 3966 } 3967 ia6_acquire(ia, &psref); 3968 pserialize_read_exit(s); 3969 3970 /* 3971 * XXX Multicast 3972 * XXX why do we care about multlicast here while we don't care 3973 * about IPv4 multicast?? 3974 * XXX scope 3975 */ 3976 ingroup = in6_multi_group(&sin6->sin6_addr, ia->ia_ifp); 3977 if (ingroup) { 3978 ia6_release(ia, &psref); 3979 goto ours; 3980 } 3981 3982 s = pserialize_read_enter(); 3983 ia6_release(ia, &psref); 3984 } 3985 pserialize_read_exit(s); 3986 3987 /* loopback, just for safety */ 3988 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr)) 3989 goto ours; 3990 3991 ours = 0; 3992 ours: 3993 curlwp_bindx(bound); 3994 3995 return ours; 3996 } 3997 #endif /*INET6*/ 3998 3999 /* 4000 * compare two secasindex structure. 4001 * flag can specify to compare 2 saidxes. 4002 * compare two secasindex structure without both mode and reqid. 4003 * don't compare port. 4004 * IN: 4005 * saidx0: source, it can be in SAD. 4006 * saidx1: object. 4007 * OUT: 4008 * 1 : equal 4009 * 0 : not equal 4010 */ 4011 static int 4012 key_saidx_match( 4013 const struct secasindex *saidx0, 4014 const struct secasindex *saidx1, 4015 int flag) 4016 { 4017 int chkport; 4018 const struct sockaddr *sa0src, *sa0dst, *sa1src, *sa1dst; 4019 4020 KASSERT(saidx0 != NULL); 4021 KASSERT(saidx1 != NULL); 4022 4023 /* sanity */ 4024 if (saidx0->proto != saidx1->proto) 4025 return 0; 4026 4027 if (flag == CMP_EXACTLY) { 4028 if (saidx0->mode != saidx1->mode) 4029 return 0; 4030 if (saidx0->reqid != saidx1->reqid) 4031 return 0; 4032 if (memcmp(&saidx0->src, &saidx1->src, saidx0->src.sa.sa_len) != 0 || 4033 memcmp(&saidx0->dst, &saidx1->dst, saidx0->dst.sa.sa_len) != 0) 4034 return 0; 4035 } else { 4036 4037 /* CMP_MODE_REQID, CMP_REQID, CMP_HEAD */ 4038 if (flag == CMP_MODE_REQID ||flag == CMP_REQID) { 4039 /* 4040 * If reqid of SPD is non-zero, unique SA is required. 4041 * The result must be of same reqid in this case. 4042 */ 4043 if (saidx1->reqid != 0 && saidx0->reqid != saidx1->reqid) 4044 return 0; 4045 } 4046 4047 if (flag == CMP_MODE_REQID) { 4048 if (saidx0->mode != IPSEC_MODE_ANY && 4049 saidx0->mode != saidx1->mode) 4050 return 0; 4051 } 4052 4053 4054 sa0src = &saidx0->src.sa; 4055 sa0dst = &saidx0->dst.sa; 4056 sa1src = &saidx1->src.sa; 4057 sa1dst = &saidx1->dst.sa; 4058 /* 4059 * If NAT-T is enabled, check ports for tunnel mode. 4060 * Don't do it for transport mode, as there is no 4061 * port information available in the SP. 4062 * Also don't check ports if they are set to zero 4063 * in the SPD: This means we have a non-generated 4064 * SPD which can't know UDP ports. 4065 */ 4066 if (saidx1->mode == IPSEC_MODE_TUNNEL) 4067 chkport = PORT_LOOSE; 4068 else 4069 chkport = PORT_NONE; 4070 4071 if (!key_sockaddr_match(sa0src, sa1src, chkport)) { 4072 return 0; 4073 } 4074 if (!key_sockaddr_match(sa0dst, sa1dst, chkport)) { 4075 return 0; 4076 } 4077 } 4078 4079 return 1; 4080 } 4081 4082 /* 4083 * compare two secindex structure exactly. 4084 * IN: 4085 * spidx0: source, it is often in SPD. 4086 * spidx1: object, it is often from PFKEY message. 4087 * OUT: 4088 * 1 : equal 4089 * 0 : not equal 4090 */ 4091 static int 4092 key_spidx_match_exactly( 4093 const struct secpolicyindex *spidx0, 4094 const struct secpolicyindex *spidx1) 4095 { 4096 4097 KASSERT(spidx0 != NULL); 4098 KASSERT(spidx1 != NULL); 4099 4100 /* sanity */ 4101 if (spidx0->prefs != spidx1->prefs || 4102 spidx0->prefd != spidx1->prefd || 4103 spidx0->ul_proto != spidx1->ul_proto) 4104 return 0; 4105 4106 return key_sockaddr_match(&spidx0->src.sa, &spidx1->src.sa, PORT_STRICT) && 4107 key_sockaddr_match(&spidx0->dst.sa, &spidx1->dst.sa, PORT_STRICT); 4108 } 4109 4110 /* 4111 * compare two secindex structure with mask. 4112 * IN: 4113 * spidx0: source, it is often in SPD. 4114 * spidx1: object, it is often from IP header. 4115 * OUT: 4116 * 1 : equal 4117 * 0 : not equal 4118 */ 4119 static int 4120 key_spidx_match_withmask( 4121 const struct secpolicyindex *spidx0, 4122 const struct secpolicyindex *spidx1) 4123 { 4124 4125 KASSERT(spidx0 != NULL); 4126 KASSERT(spidx1 != NULL); 4127 4128 if (spidx0->src.sa.sa_family != spidx1->src.sa.sa_family || 4129 spidx0->dst.sa.sa_family != spidx1->dst.sa.sa_family || 4130 spidx0->src.sa.sa_len != spidx1->src.sa.sa_len || 4131 spidx0->dst.sa.sa_len != spidx1->dst.sa.sa_len) 4132 return 0; 4133 4134 /* if spidx.ul_proto == IPSEC_ULPROTO_ANY, ignore. */ 4135 if (spidx0->ul_proto != (u_int16_t)IPSEC_ULPROTO_ANY && 4136 spidx0->ul_proto != spidx1->ul_proto) 4137 return 0; 4138 4139 switch (spidx0->src.sa.sa_family) { 4140 case AF_INET: 4141 if (spidx0->src.sin.sin_port != IPSEC_PORT_ANY && 4142 spidx0->src.sin.sin_port != spidx1->src.sin.sin_port) 4143 return 0; 4144 if (!key_bb_match_withmask(&spidx0->src.sin.sin_addr, 4145 &spidx1->src.sin.sin_addr, spidx0->prefs)) 4146 return 0; 4147 break; 4148 case AF_INET6: 4149 if (spidx0->src.sin6.sin6_port != IPSEC_PORT_ANY && 4150 spidx0->src.sin6.sin6_port != spidx1->src.sin6.sin6_port) 4151 return 0; 4152 /* 4153 * scope_id check. if sin6_scope_id is 0, we regard it 4154 * as a wildcard scope, which matches any scope zone ID. 4155 */ 4156 if (spidx0->src.sin6.sin6_scope_id && 4157 spidx1->src.sin6.sin6_scope_id && 4158 spidx0->src.sin6.sin6_scope_id != spidx1->src.sin6.sin6_scope_id) 4159 return 0; 4160 if (!key_bb_match_withmask(&spidx0->src.sin6.sin6_addr, 4161 &spidx1->src.sin6.sin6_addr, spidx0->prefs)) 4162 return 0; 4163 break; 4164 default: 4165 /* XXX */ 4166 if (memcmp(&spidx0->src, &spidx1->src, spidx0->src.sa.sa_len) != 0) 4167 return 0; 4168 break; 4169 } 4170 4171 switch (spidx0->dst.sa.sa_family) { 4172 case AF_INET: 4173 if (spidx0->dst.sin.sin_port != IPSEC_PORT_ANY && 4174 spidx0->dst.sin.sin_port != spidx1->dst.sin.sin_port) 4175 return 0; 4176 if (!key_bb_match_withmask(&spidx0->dst.sin.sin_addr, 4177 &spidx1->dst.sin.sin_addr, spidx0->prefd)) 4178 return 0; 4179 break; 4180 case AF_INET6: 4181 if (spidx0->dst.sin6.sin6_port != IPSEC_PORT_ANY && 4182 spidx0->dst.sin6.sin6_port != spidx1->dst.sin6.sin6_port) 4183 return 0; 4184 /* 4185 * scope_id check. if sin6_scope_id is 0, we regard it 4186 * as a wildcard scope, which matches any scope zone ID. 4187 */ 4188 if (spidx0->src.sin6.sin6_scope_id && 4189 spidx1->src.sin6.sin6_scope_id && 4190 spidx0->dst.sin6.sin6_scope_id != spidx1->dst.sin6.sin6_scope_id) 4191 return 0; 4192 if (!key_bb_match_withmask(&spidx0->dst.sin6.sin6_addr, 4193 &spidx1->dst.sin6.sin6_addr, spidx0->prefd)) 4194 return 0; 4195 break; 4196 default: 4197 /* XXX */ 4198 if (memcmp(&spidx0->dst, &spidx1->dst, spidx0->dst.sa.sa_len) != 0) 4199 return 0; 4200 break; 4201 } 4202 4203 /* XXX Do we check other field ? e.g. flowinfo */ 4204 4205 return 1; 4206 } 4207 4208 /* returns 0 on match */ 4209 static int 4210 key_portcomp(in_port_t port1, in_port_t port2, int howport) 4211 { 4212 switch (howport) { 4213 case PORT_NONE: 4214 return 0; 4215 case PORT_LOOSE: 4216 if (port1 == 0 || port2 == 0) 4217 return 0; 4218 /*FALLTHROUGH*/ 4219 case PORT_STRICT: 4220 if (port1 != port2) { 4221 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 4222 "port fail %d != %d\n", port1, port2); 4223 return 1; 4224 } 4225 return 0; 4226 default: 4227 KASSERT(0); 4228 return 1; 4229 } 4230 } 4231 4232 /* returns 1 on match */ 4233 static int 4234 key_sockaddr_match( 4235 const struct sockaddr *sa1, 4236 const struct sockaddr *sa2, 4237 int howport) 4238 { 4239 const struct sockaddr_in *sin1, *sin2; 4240 const struct sockaddr_in6 *sin61, *sin62; 4241 4242 if (sa1->sa_family != sa2->sa_family || sa1->sa_len != sa2->sa_len) { 4243 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 4244 "fam/len fail %d != %d || %d != %d\n", 4245 sa1->sa_family, sa2->sa_family, sa1->sa_len, 4246 sa2->sa_len); 4247 return 0; 4248 } 4249 4250 switch (sa1->sa_family) { 4251 case AF_INET: 4252 if (sa1->sa_len != sizeof(struct sockaddr_in)) { 4253 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 4254 "len fail %d != %zu\n", 4255 sa1->sa_len, sizeof(struct sockaddr_in)); 4256 return 0; 4257 } 4258 sin1 = (const struct sockaddr_in *)sa1; 4259 sin2 = (const struct sockaddr_in *)sa2; 4260 if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) { 4261 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 4262 "addr fail %#x != %#x\n", 4263 sin1->sin_addr.s_addr, sin2->sin_addr.s_addr); 4264 return 0; 4265 } 4266 if (key_portcomp(sin1->sin_port, sin2->sin_port, howport)) { 4267 return 0; 4268 } 4269 KEYDEBUG_PRINTF(KEYDEBUG_MATCH, 4270 "addr success %#x[%d] == %#x[%d]\n", 4271 sin1->sin_addr.s_addr, sin1->sin_port, 4272 sin2->sin_addr.s_addr, sin2->sin_port); 4273 break; 4274 case AF_INET6: 4275 sin61 = (const struct sockaddr_in6 *)sa1; 4276 sin62 = (const struct sockaddr_in6 *)sa2; 4277 if (sa1->sa_len != sizeof(struct sockaddr_in6)) 4278 return 0; /*EINVAL*/ 4279 4280 if (sin61->sin6_scope_id != sin62->sin6_scope_id) { 4281 return 0; 4282 } 4283 if (!IN6_ARE_ADDR_EQUAL(&sin61->sin6_addr, &sin62->sin6_addr)) { 4284 return 0; 4285 } 4286 if (key_portcomp(sin61->sin6_port, sin62->sin6_port, howport)) { 4287 return 0; 4288 } 4289 break; 4290 default: 4291 if (memcmp(sa1, sa2, sa1->sa_len) != 0) 4292 return 0; 4293 break; 4294 } 4295 4296 return 1; 4297 } 4298 4299 /* 4300 * compare two buffers with mask. 4301 * IN: 4302 * addr1: source 4303 * addr2: object 4304 * bits: Number of bits to compare 4305 * OUT: 4306 * 1 : equal 4307 * 0 : not equal 4308 */ 4309 static int 4310 key_bb_match_withmask(const void *a1, const void *a2, u_int bits) 4311 { 4312 const unsigned char *p1 = a1; 4313 const unsigned char *p2 = a2; 4314 4315 /* XXX: This could be considerably faster if we compare a word 4316 * at a time, but it is complicated on LSB Endian machines */ 4317 4318 /* Handle null pointers */ 4319 if (p1 == NULL || p2 == NULL) 4320 return (p1 == p2); 4321 4322 while (bits >= 8) { 4323 if (*p1++ != *p2++) 4324 return 0; 4325 bits -= 8; 4326 } 4327 4328 if (bits > 0) { 4329 u_int8_t mask = ~((1<<(8-bits))-1); 4330 if ((*p1 & mask) != (*p2 & mask)) 4331 return 0; 4332 } 4333 return 1; /* Match! */ 4334 } 4335 4336 static void 4337 key_timehandler_spd(time_t now) 4338 { 4339 u_int dir; 4340 struct secpolicy *sp; 4341 4342 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 4343 retry: 4344 SPLIST_WRITER_FOREACH(sp, dir) { 4345 if (sp->state == IPSEC_SPSTATE_DEAD) { 4346 key_sp_unlink(sp); /*XXX*/ 4347 goto retry; 4348 } 4349 4350 if (sp->lifetime == 0 && sp->validtime == 0) 4351 continue; 4352 4353 /* the deletion will occur next time */ 4354 if ((sp->lifetime && now - sp->created > sp->lifetime) || 4355 (sp->validtime && now - sp->lastused > sp->validtime)) { 4356 key_sp_dead(sp); 4357 key_spdexpire(sp); 4358 goto retry; 4359 } 4360 } 4361 } 4362 } 4363 4364 static void 4365 key_timehandler_sad(time_t now) 4366 { 4367 struct secashead *sah, *nextsah; 4368 struct secasvar *sav, *nextsav; 4369 4370 LIST_FOREACH_SAFE(sah, &sahtree, chain, nextsah) { 4371 /* if sah has been dead, then delete it and process next sah. */ 4372 if (sah->state == SADB_SASTATE_DEAD) { 4373 key_delsah(sah); 4374 continue; 4375 } 4376 4377 /* if LARVAL entry doesn't become MATURE, delete it. */ 4378 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_LARVAL], 4379 chain, nextsav) { 4380 if (now - sav->created > key_larval_lifetime) { 4381 KEY_FREESAV(&sav); 4382 } 4383 } 4384 4385 /* 4386 * check MATURE entry to start to send expire message 4387 * whether or not. 4388 */ 4389 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_MATURE], 4390 chain, nextsav) { 4391 /* we don't need to check. */ 4392 if (sav->lft_s == NULL) 4393 continue; 4394 4395 /* sanity check */ 4396 KASSERT(sav->lft_c != NULL); 4397 4398 /* check SOFT lifetime */ 4399 if (sav->lft_s->sadb_lifetime_addtime != 0 && 4400 now - sav->created > sav->lft_s->sadb_lifetime_addtime) { 4401 /* 4402 * check SA to be used whether or not. 4403 * when SA hasn't been used, delete it. 4404 */ 4405 if (sav->lft_c->sadb_lifetime_usetime == 0) { 4406 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4407 KEY_FREESAV(&sav); 4408 } else { 4409 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4410 /* 4411 * XXX If we keep to send expire 4412 * message in the status of 4413 * DYING. Do remove below code. 4414 */ 4415 key_expire(sav); 4416 } 4417 } 4418 /* check SOFT lifetime by bytes */ 4419 /* 4420 * XXX I don't know the way to delete this SA 4421 * when new SA is installed. Caution when it's 4422 * installed too big lifetime by time. 4423 */ 4424 else if (sav->lft_s->sadb_lifetime_bytes != 0 && 4425 sav->lft_s->sadb_lifetime_bytes < 4426 sav->lft_c->sadb_lifetime_bytes) { 4427 4428 key_sa_chgstate(sav, SADB_SASTATE_DYING); 4429 /* 4430 * XXX If we keep to send expire 4431 * message in the status of 4432 * DYING. Do remove below code. 4433 */ 4434 key_expire(sav); 4435 } 4436 } 4437 4438 /* check DYING entry to change status to DEAD. */ 4439 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DYING], 4440 chain, nextsav) { 4441 /* we don't need to check. */ 4442 if (sav->lft_h == NULL) 4443 continue; 4444 4445 /* sanity check */ 4446 KASSERT(sav->lft_c != NULL); 4447 4448 if (sav->lft_h->sadb_lifetime_addtime != 0 && 4449 now - sav->created > sav->lft_h->sadb_lifetime_addtime) { 4450 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4451 KEY_FREESAV(&sav); 4452 } 4453 #if 0 /* XXX Should we keep to send expire message until HARD lifetime ? */ 4454 else if (sav->lft_s != NULL 4455 && sav->lft_s->sadb_lifetime_addtime != 0 4456 && now - sav->created > sav->lft_s->sadb_lifetime_addtime) { 4457 /* 4458 * XXX: should be checked to be 4459 * installed the valid SA. 4460 */ 4461 4462 /* 4463 * If there is no SA then sending 4464 * expire message. 4465 */ 4466 key_expire(sav); 4467 } 4468 #endif 4469 /* check HARD lifetime by bytes */ 4470 else if (sav->lft_h->sadb_lifetime_bytes != 0 && 4471 sav->lft_h->sadb_lifetime_bytes < 4472 sav->lft_c->sadb_lifetime_bytes) { 4473 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 4474 KEY_FREESAV(&sav); 4475 } 4476 } 4477 4478 /* delete entry in DEAD */ 4479 LIST_FOREACH_SAFE(sav, &sah->savtree[SADB_SASTATE_DEAD], 4480 chain, nextsav) { 4481 /* sanity check */ 4482 if (sav->state != SADB_SASTATE_DEAD) { 4483 IPSECLOG(LOG_DEBUG, 4484 "invalid sav->state (queue: %d SA: %d): " 4485 "kill it anyway\n", 4486 SADB_SASTATE_DEAD, sav->state); 4487 } 4488 4489 /* 4490 * do not call key_freesav() here. 4491 * sav should already be freed, and sav->refcnt 4492 * shows other references to sav 4493 * (such as from SPD). 4494 */ 4495 } 4496 } 4497 } 4498 4499 static void 4500 key_timehandler_acq(time_t now) 4501 { 4502 #ifndef IPSEC_NONBLOCK_ACQUIRE 4503 struct secacq *acq, *nextacq; 4504 4505 restart: 4506 mutex_enter(&key_mtx); 4507 LIST_FOREACH_SAFE(acq, &acqtree, chain, nextacq) { 4508 if (now - acq->created > key_blockacq_lifetime) { 4509 LIST_REMOVE(acq, chain); 4510 mutex_exit(&key_mtx); 4511 kmem_free(acq, sizeof(*acq)); 4512 goto restart; 4513 } 4514 } 4515 mutex_exit(&key_mtx); 4516 #endif 4517 } 4518 4519 static void 4520 key_timehandler_spacq(time_t now) 4521 { 4522 #ifdef notyet 4523 struct secspacq *acq, *nextacq; 4524 4525 LIST_FOREACH_SAFE(acq, &spacqtree, chain, nextacq) { 4526 if (now - acq->created > key_blockacq_lifetime) { 4527 KASSERT(__LIST_CHAINED(acq)); 4528 LIST_REMOVE(acq, chain); 4529 kmem_free(acq, sizeof(*acq)); 4530 } 4531 } 4532 #endif 4533 } 4534 4535 /* 4536 * time handler. 4537 * scanning SPD and SAD to check status for each entries, 4538 * and do to remove or to expire. 4539 */ 4540 static void 4541 key_timehandler_work(struct work *wk, void *arg) 4542 { 4543 time_t now = time_uptime; 4544 IPSEC_DECLARE_LOCK_VARIABLE; 4545 4546 IPSEC_ACQUIRE_GLOBAL_LOCKS(); 4547 4548 key_timehandler_spd(now); 4549 key_timehandler_sad(now); 4550 key_timehandler_acq(now); 4551 key_timehandler_spacq(now); 4552 4553 /* do exchange to tick time !! */ 4554 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); 4555 4556 IPSEC_RELEASE_GLOBAL_LOCKS(); 4557 return; 4558 } 4559 4560 static void 4561 key_timehandler(void *arg) 4562 { 4563 4564 workqueue_enqueue(key_timehandler_wq, &key_timehandler_wk, NULL); 4565 } 4566 4567 u_long 4568 key_random(void) 4569 { 4570 u_long value; 4571 4572 key_randomfill(&value, sizeof(value)); 4573 return value; 4574 } 4575 4576 void 4577 key_randomfill(void *p, size_t l) 4578 { 4579 4580 cprng_fast(p, l); 4581 } 4582 4583 /* 4584 * map SADB_SATYPE_* to IPPROTO_*. 4585 * if satype == SADB_SATYPE then satype is mapped to ~0. 4586 * OUT: 4587 * 0: invalid satype. 4588 */ 4589 static u_int16_t 4590 key_satype2proto(u_int8_t satype) 4591 { 4592 switch (satype) { 4593 case SADB_SATYPE_UNSPEC: 4594 return IPSEC_PROTO_ANY; 4595 case SADB_SATYPE_AH: 4596 return IPPROTO_AH; 4597 case SADB_SATYPE_ESP: 4598 return IPPROTO_ESP; 4599 case SADB_X_SATYPE_IPCOMP: 4600 return IPPROTO_IPCOMP; 4601 case SADB_X_SATYPE_TCPSIGNATURE: 4602 return IPPROTO_TCP; 4603 default: 4604 return 0; 4605 } 4606 /* NOTREACHED */ 4607 } 4608 4609 /* 4610 * map IPPROTO_* to SADB_SATYPE_* 4611 * OUT: 4612 * 0: invalid protocol type. 4613 */ 4614 static u_int8_t 4615 key_proto2satype(u_int16_t proto) 4616 { 4617 switch (proto) { 4618 case IPPROTO_AH: 4619 return SADB_SATYPE_AH; 4620 case IPPROTO_ESP: 4621 return SADB_SATYPE_ESP; 4622 case IPPROTO_IPCOMP: 4623 return SADB_X_SATYPE_IPCOMP; 4624 case IPPROTO_TCP: 4625 return SADB_X_SATYPE_TCPSIGNATURE; 4626 default: 4627 return 0; 4628 } 4629 /* NOTREACHED */ 4630 } 4631 4632 static int 4633 key_setsecasidx(int proto, int mode, int reqid, 4634 const struct sockaddr *src, const struct sockaddr *dst, 4635 struct secasindex * saidx) 4636 { 4637 const union sockaddr_union *src_u = (const union sockaddr_union *)src; 4638 const union sockaddr_union *dst_u = (const union sockaddr_union *)dst; 4639 4640 /* sa len safety check */ 4641 if (key_checksalen(src_u) != 0) 4642 return -1; 4643 if (key_checksalen(dst_u) != 0) 4644 return -1; 4645 4646 memset(saidx, 0, sizeof(*saidx)); 4647 saidx->proto = proto; 4648 saidx->mode = mode; 4649 saidx->reqid = reqid; 4650 memcpy(&saidx->src, src_u, src_u->sa.sa_len); 4651 memcpy(&saidx->dst, dst_u, dst_u->sa.sa_len); 4652 4653 key_porttosaddr(&((saidx)->src), 0); 4654 key_porttosaddr(&((saidx)->dst), 0); 4655 return 0; 4656 } 4657 4658 static void 4659 key_init_spidx_bymsghdr(struct secpolicyindex *spidx, 4660 const struct sadb_msghdr *mhp) 4661 { 4662 const struct sadb_address *src0, *dst0; 4663 const struct sockaddr *src, *dst; 4664 const struct sadb_x_policy *xpl0; 4665 4666 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4667 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4668 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 4669 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 4670 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 4671 4672 memset(spidx, 0, sizeof(*spidx)); 4673 spidx->dir = xpl0->sadb_x_policy_dir; 4674 spidx->prefs = src0->sadb_address_prefixlen; 4675 spidx->prefd = dst0->sadb_address_prefixlen; 4676 spidx->ul_proto = src0->sadb_address_proto; 4677 /* XXX boundary check against sa_len */ 4678 memcpy(&spidx->src, src, src->sa_len); 4679 memcpy(&spidx->dst, dst, dst->sa_len); 4680 } 4681 4682 /* %%% PF_KEY */ 4683 /* 4684 * SADB_GETSPI processing is to receive 4685 * <base, (SA2), src address, dst address, (SPI range)> 4686 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4687 * tree with the status of LARVAL, and send 4688 * <base, SA(*), address(SD)> 4689 * to the IKMPd. 4690 * 4691 * IN: mhp: pointer to the pointer to each header. 4692 * OUT: NULL if fail. 4693 * other if success, return pointer to the message to send. 4694 */ 4695 static int 4696 key_api_getspi(struct socket *so, struct mbuf *m, 4697 const struct sadb_msghdr *mhp) 4698 { 4699 const struct sockaddr *src, *dst; 4700 struct secasindex saidx; 4701 struct secashead *newsah; 4702 struct secasvar *newsav; 4703 u_int8_t proto; 4704 u_int32_t spi; 4705 u_int8_t mode; 4706 u_int16_t reqid; 4707 int error; 4708 4709 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4710 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4711 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 4712 return key_senderror(so, m, EINVAL); 4713 } 4714 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4715 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4716 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 4717 return key_senderror(so, m, EINVAL); 4718 } 4719 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4720 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4721 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4722 } else { 4723 mode = IPSEC_MODE_ANY; 4724 reqid = 0; 4725 } 4726 4727 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 4728 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 4729 4730 /* map satype to proto */ 4731 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 4732 if (proto == 0) { 4733 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 4734 return key_senderror(so, m, EINVAL); 4735 } 4736 4737 4738 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 4739 if (error != 0) 4740 return key_senderror(so, m, EINVAL); 4741 4742 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 4743 if (error != 0) 4744 return key_senderror(so, m, EINVAL); 4745 4746 /* SPI allocation */ 4747 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4748 &saidx); 4749 if (spi == 0) 4750 return key_senderror(so, m, EINVAL); 4751 4752 /* get a SA index */ 4753 newsah = key_getsah(&saidx, CMP_REQID); 4754 if (newsah == NULL) { 4755 /* create a new SA index */ 4756 newsah = key_newsah(&saidx); 4757 if (newsah == NULL) { 4758 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 4759 return key_senderror(so, m, ENOBUFS); 4760 } 4761 } 4762 4763 /* get a new SA */ 4764 /* XXX rewrite */ 4765 newsav = KEY_NEWSAV(m, mhp, &error); 4766 if (newsav == NULL) { 4767 /* XXX don't free new SA index allocated in above. */ 4768 return key_senderror(so, m, error); 4769 } 4770 4771 /* set spi */ 4772 newsav->spi = htonl(spi); 4773 4774 /* add to satree */ 4775 newsav->refcnt = 1; 4776 newsav->sah = newsah; 4777 newsav->state = SADB_SASTATE_LARVAL; 4778 LIST_INSERT_TAIL(&newsah->savtree[SADB_SASTATE_LARVAL], newsav, 4779 secasvar, chain); 4780 key_validate_savlist(newsah, SADB_SASTATE_LARVAL); 4781 4782 #ifndef IPSEC_NONBLOCK_ACQUIRE 4783 /* delete the entry in acqtree */ 4784 if (mhp->msg->sadb_msg_seq != 0) { 4785 struct secacq *acq; 4786 mutex_enter(&key_mtx); 4787 acq = key_getacqbyseq(mhp->msg->sadb_msg_seq); 4788 if (acq != NULL) { 4789 /* reset counter in order to deletion by timehandler. */ 4790 acq->created = time_uptime; 4791 acq->count = 0; 4792 } 4793 mutex_exit(&key_mtx); 4794 } 4795 #endif 4796 4797 { 4798 struct mbuf *n, *nn; 4799 struct sadb_sa *m_sa; 4800 int off, len; 4801 4802 CTASSERT(PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4803 PFKEY_ALIGN8(sizeof(struct sadb_sa)) <= MCLBYTES); 4804 4805 /* create new sadb_msg to reply. */ 4806 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4807 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4808 4809 MGETHDR(n, M_DONTWAIT, MT_DATA); 4810 if (len > MHLEN) { 4811 MCLGET(n, M_DONTWAIT); 4812 if ((n->m_flags & M_EXT) == 0) { 4813 m_freem(n); 4814 n = NULL; 4815 } 4816 } 4817 if (!n) 4818 return key_senderror(so, m, ENOBUFS); 4819 4820 n->m_len = len; 4821 n->m_next = NULL; 4822 off = 0; 4823 4824 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); 4825 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4826 4827 m_sa = (struct sadb_sa *)(mtod(n, char *) + off); 4828 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4829 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4830 m_sa->sadb_sa_spi = htonl(spi); 4831 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4832 4833 KASSERTMSG(off == len, "length inconsistency"); 4834 4835 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4836 SADB_EXT_ADDRESS_DST); 4837 if (!n->m_next) { 4838 m_freem(n); 4839 return key_senderror(so, m, ENOBUFS); 4840 } 4841 4842 if (n->m_len < sizeof(struct sadb_msg)) { 4843 n = m_pullup(n, sizeof(struct sadb_msg)); 4844 if (n == NULL) 4845 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4846 } 4847 4848 n->m_pkthdr.len = 0; 4849 for (nn = n; nn; nn = nn->m_next) 4850 n->m_pkthdr.len += nn->m_len; 4851 4852 key_fill_replymsg(n, newsav->seq); 4853 4854 m_freem(m); 4855 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4856 } 4857 } 4858 4859 /* 4860 * allocating new SPI 4861 * called by key_api_getspi(). 4862 * OUT: 4863 * 0: failure. 4864 * others: success. 4865 */ 4866 static u_int32_t 4867 key_do_getnewspi(const struct sadb_spirange *spirange, 4868 const struct secasindex *saidx) 4869 { 4870 u_int32_t newspi; 4871 u_int32_t spmin, spmax; 4872 int count = key_spi_trycnt; 4873 4874 /* set spi range to allocate */ 4875 if (spirange != NULL) { 4876 spmin = spirange->sadb_spirange_min; 4877 spmax = spirange->sadb_spirange_max; 4878 } else { 4879 spmin = key_spi_minval; 4880 spmax = key_spi_maxval; 4881 } 4882 /* IPCOMP needs 2-byte SPI */ 4883 if (saidx->proto == IPPROTO_IPCOMP) { 4884 u_int32_t t; 4885 if (spmin >= 0x10000) 4886 spmin = 0xffff; 4887 if (spmax >= 0x10000) 4888 spmax = 0xffff; 4889 if (spmin > spmax) { 4890 t = spmin; spmin = spmax; spmax = t; 4891 } 4892 } 4893 4894 if (spmin == spmax) { 4895 if (key_checkspidup(saidx, htonl(spmin))) { 4896 IPSECLOG(LOG_DEBUG, "SPI %u exists already.\n", spmin); 4897 return 0; 4898 } 4899 4900 count--; /* taking one cost. */ 4901 newspi = spmin; 4902 4903 } else { 4904 4905 /* init SPI */ 4906 newspi = 0; 4907 4908 /* when requesting to allocate spi ranged */ 4909 while (count--) { 4910 /* generate pseudo-random SPI value ranged. */ 4911 newspi = spmin + (key_random() % (spmax - spmin + 1)); 4912 4913 if (!key_checkspidup(saidx, htonl(newspi))) 4914 break; 4915 } 4916 4917 if (count == 0 || newspi == 0) { 4918 IPSECLOG(LOG_DEBUG, "to allocate spi is failed.\n"); 4919 return 0; 4920 } 4921 } 4922 4923 /* statistics */ 4924 keystat.getspi_count = 4925 (keystat.getspi_count + key_spi_trycnt - count) / 2; 4926 4927 return newspi; 4928 } 4929 4930 static int 4931 key_handle_natt_info(struct secasvar *sav, 4932 const struct sadb_msghdr *mhp) 4933 { 4934 const char *msg = "?" ; 4935 struct sadb_x_nat_t_type *type; 4936 struct sadb_x_nat_t_port *sport, *dport; 4937 struct sadb_address *iaddr, *raddr; 4938 struct sadb_x_nat_t_frag *frag; 4939 4940 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] == NULL || 4941 mhp->ext[SADB_X_EXT_NAT_T_SPORT] == NULL || 4942 mhp->ext[SADB_X_EXT_NAT_T_DPORT] == NULL) 4943 return 0; 4944 4945 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) { 4946 msg = "TYPE"; 4947 goto bad; 4948 } 4949 4950 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) { 4951 msg = "SPORT"; 4952 goto bad; 4953 } 4954 4955 if (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4956 msg = "DPORT"; 4957 goto bad; 4958 } 4959 4960 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) { 4961 IPSECLOG(LOG_DEBUG, "NAT-T OAi present\n"); 4962 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr)) { 4963 msg = "OAI"; 4964 goto bad; 4965 } 4966 } 4967 4968 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 4969 IPSECLOG(LOG_DEBUG, "NAT-T OAr present\n"); 4970 if (mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 4971 msg = "OAR"; 4972 goto bad; 4973 } 4974 } 4975 4976 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 4977 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 4978 msg = "FRAG"; 4979 goto bad; 4980 } 4981 } 4982 4983 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 4984 sport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4985 dport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4986 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 4987 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 4988 frag = (struct sadb_x_nat_t_frag *)mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 4989 4990 IPSECLOG(LOG_DEBUG, "type %d, sport = %d, dport = %d\n", 4991 type->sadb_x_nat_t_type_type, 4992 ntohs(sport->sadb_x_nat_t_port_port), 4993 ntohs(dport->sadb_x_nat_t_port_port)); 4994 4995 sav->natt_type = type->sadb_x_nat_t_type_type; 4996 key_porttosaddr(&sav->sah->saidx.src, sport->sadb_x_nat_t_port_port); 4997 key_porttosaddr(&sav->sah->saidx.dst, dport->sadb_x_nat_t_port_port); 4998 if (frag) 4999 sav->esp_frag = frag->sadb_x_nat_t_frag_fraglen; 5000 else 5001 sav->esp_frag = IP_MAXPACKET; 5002 5003 return 0; 5004 bad: 5005 IPSECLOG(LOG_DEBUG, "invalid message %s\n", msg); 5006 __USE(msg); 5007 return -1; 5008 } 5009 5010 /* Just update the IPSEC_NAT_T ports if present */ 5011 static int 5012 key_set_natt_ports(union sockaddr_union *src, union sockaddr_union *dst, 5013 const struct sadb_msghdr *mhp) 5014 { 5015 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 5016 IPSECLOG(LOG_DEBUG, "NAT-T OAi present\n"); 5017 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 5018 IPSECLOG(LOG_DEBUG, "NAT-T OAr present\n"); 5019 5020 if ((mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL) && 5021 (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL) && 5022 (mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL)) { 5023 struct sadb_x_nat_t_type *type; 5024 struct sadb_x_nat_t_port *sport; 5025 struct sadb_x_nat_t_port *dport; 5026 5027 if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) || 5028 (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) || 5029 (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) { 5030 IPSECLOG(LOG_DEBUG, "invalid message\n"); 5031 return -1; 5032 } 5033 5034 type = (struct sadb_x_nat_t_type *) 5035 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5036 sport = (struct sadb_x_nat_t_port *) 5037 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5038 dport = (struct sadb_x_nat_t_port *) 5039 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5040 5041 key_porttosaddr(src, sport->sadb_x_nat_t_port_port); 5042 key_porttosaddr(dst, dport->sadb_x_nat_t_port_port); 5043 5044 IPSECLOG(LOG_DEBUG, "type %d, sport = %d, dport = %d\n", 5045 type->sadb_x_nat_t_type_type, 5046 ntohs(sport->sadb_x_nat_t_port_port), 5047 ntohs(dport->sadb_x_nat_t_port_port)); 5048 } 5049 5050 return 0; 5051 } 5052 5053 5054 /* 5055 * SADB_UPDATE processing 5056 * receive 5057 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5058 * key(AE), (identity(SD),) (sensitivity)> 5059 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 5060 * and send 5061 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5062 * (identity(SD),) (sensitivity)> 5063 * to the ikmpd. 5064 * 5065 * m will always be freed. 5066 */ 5067 static int 5068 key_api_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5069 { 5070 struct sadb_sa *sa0; 5071 const struct sockaddr *src, *dst; 5072 struct secasindex saidx; 5073 struct secashead *sah; 5074 struct secasvar *sav, *newsav; 5075 u_int16_t proto; 5076 u_int8_t mode; 5077 u_int16_t reqid; 5078 int error; 5079 5080 /* map satype to proto */ 5081 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5082 if (proto == 0) { 5083 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5084 return key_senderror(so, m, EINVAL); 5085 } 5086 5087 if (mhp->ext[SADB_EXT_SA] == NULL || 5088 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5089 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5090 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5091 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5092 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5093 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5094 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5095 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5096 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5097 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5098 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5099 return key_senderror(so, m, EINVAL); 5100 } 5101 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5102 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5103 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5104 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5105 return key_senderror(so, m, EINVAL); 5106 } 5107 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5108 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5109 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5110 } else { 5111 mode = IPSEC_MODE_ANY; 5112 reqid = 0; 5113 } 5114 /* XXX boundary checking for other extensions */ 5115 5116 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5117 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5118 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5119 5120 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 5121 if (error != 0) 5122 return key_senderror(so, m, EINVAL); 5123 5124 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5125 if (error != 0) 5126 return key_senderror(so, m, EINVAL); 5127 5128 /* get a SA header */ 5129 sah = key_getsah(&saidx, CMP_REQID); 5130 if (sah == NULL) { 5131 IPSECLOG(LOG_DEBUG, "no SA index found.\n"); 5132 return key_senderror(so, m, ENOENT); 5133 } 5134 5135 /* set spidx if there */ 5136 /* XXX rewrite */ 5137 error = key_setident(sah, m, mhp); 5138 if (error) 5139 return key_senderror(so, m, error); 5140 5141 /* find a SA with sequence number. */ 5142 #ifdef IPSEC_DOSEQCHECK 5143 if (mhp->msg->sadb_msg_seq != 0) { 5144 sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq); 5145 if (sav == NULL) { 5146 IPSECLOG(LOG_DEBUG, 5147 "no larval SA with sequence %u exists.\n", 5148 mhp->msg->sadb_msg_seq); 5149 return key_senderror(so, m, ENOENT); 5150 } 5151 } 5152 #else 5153 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5154 if (sav == NULL) { 5155 IPSECLOG(LOG_DEBUG, "no such a SA found (spi:%u)\n", 5156 (u_int32_t)ntohl(sa0->sadb_sa_spi)); 5157 return key_senderror(so, m, EINVAL); 5158 } 5159 #endif 5160 5161 /* validity check */ 5162 if (sav->sah->saidx.proto != proto) { 5163 IPSECLOG(LOG_DEBUG, "protocol mismatched (DB=%u param=%u)\n", 5164 sav->sah->saidx.proto, proto); 5165 error = EINVAL; 5166 goto error; 5167 } 5168 #ifdef IPSEC_DOSEQCHECK 5169 if (sav->spi != sa0->sadb_sa_spi) { 5170 IPSECLOG(LOG_DEBUG, "SPI mismatched (DB:%u param:%u)\n", 5171 (u_int32_t)ntohl(sav->spi), 5172 (u_int32_t)ntohl(sa0->sadb_sa_spi)); 5173 error = EINVAL; 5174 goto error; 5175 } 5176 #endif 5177 if (sav->pid != mhp->msg->sadb_msg_pid) { 5178 IPSECLOG(LOG_DEBUG, "pid mismatched (DB:%u param:%u)\n", 5179 sav->pid, mhp->msg->sadb_msg_pid); 5180 error = EINVAL; 5181 goto error; 5182 } 5183 5184 /* 5185 * Allocate a new SA instead of modifying the existing SA directly 5186 * to avoid race conditions. 5187 */ 5188 newsav = kmem_zalloc(sizeof(struct secasvar), KM_SLEEP); 5189 5190 /* copy sav values */ 5191 newsav->spi = sav->spi; 5192 newsav->seq = sav->seq; 5193 newsav->created = sav->created; 5194 newsav->pid = sav->pid; 5195 newsav->sah = sav->sah; 5196 5197 error = key_setsaval(newsav, m, mhp); 5198 if (error) { 5199 key_delsav(newsav); 5200 goto error; 5201 } 5202 5203 error = key_handle_natt_info(newsav, mhp); 5204 if (error != 0) { 5205 key_delsav(newsav); 5206 goto error; 5207 } 5208 5209 error = key_init_xform(newsav); 5210 if (error != 0) { 5211 key_delsav(newsav); 5212 goto error; 5213 } 5214 5215 /* add to satree */ 5216 newsav->refcnt = 1; 5217 newsav->state = SADB_SASTATE_MATURE; 5218 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_MATURE], newsav, 5219 secasvar, chain); 5220 key_validate_savlist(sah, SADB_SASTATE_MATURE); 5221 5222 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5223 KEY_FREESAV(&sav); 5224 KEY_FREESAV(&sav); 5225 5226 { 5227 struct mbuf *n; 5228 5229 /* set msg buf from mhp */ 5230 n = key_getmsgbuf_x1(m, mhp); 5231 if (n == NULL) { 5232 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5233 return key_senderror(so, m, ENOBUFS); 5234 } 5235 5236 m_freem(m); 5237 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5238 } 5239 error: 5240 KEY_FREESAV(&sav); 5241 return key_senderror(so, m, error); 5242 } 5243 5244 /* 5245 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5246 * only called by key_api_update(). 5247 * OUT: 5248 * NULL : not found 5249 * others : found, pointer to a SA. 5250 */ 5251 #ifdef IPSEC_DOSEQCHECK 5252 static struct secasvar * 5253 key_getsavbyseq(struct secashead *sah, u_int32_t seq) 5254 { 5255 struct secasvar *sav; 5256 u_int state; 5257 5258 state = SADB_SASTATE_LARVAL; 5259 5260 /* search SAD with sequence number ? */ 5261 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5262 5263 KEY_CHKSASTATE(state, sav->state); 5264 5265 if (sav->seq == seq) { 5266 SA_ADDREF(sav); 5267 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 5268 "DP cause refcnt++:%d SA:%p\n", 5269 sav->refcnt, sav); 5270 return sav; 5271 } 5272 } 5273 5274 return NULL; 5275 } 5276 #endif 5277 5278 /* 5279 * SADB_ADD processing 5280 * add an entry to SA database, when received 5281 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5282 * key(AE), (identity(SD),) (sensitivity)> 5283 * from the ikmpd, 5284 * and send 5285 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5286 * (identity(SD),) (sensitivity)> 5287 * to the ikmpd. 5288 * 5289 * IGNORE identity and sensitivity messages. 5290 * 5291 * m will always be freed. 5292 */ 5293 static int 5294 key_api_add(struct socket *so, struct mbuf *m, 5295 const struct sadb_msghdr *mhp) 5296 { 5297 struct sadb_sa *sa0; 5298 const struct sockaddr *src, *dst; 5299 struct secasindex saidx; 5300 struct secashead *newsah; 5301 struct secasvar *newsav; 5302 u_int16_t proto; 5303 u_int8_t mode; 5304 u_int16_t reqid; 5305 int error; 5306 5307 /* map satype to proto */ 5308 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5309 if (proto == 0) { 5310 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5311 return key_senderror(so, m, EINVAL); 5312 } 5313 5314 if (mhp->ext[SADB_EXT_SA] == NULL || 5315 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5316 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5317 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5318 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5319 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5320 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5321 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5322 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5323 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5324 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5325 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5326 return key_senderror(so, m, EINVAL); 5327 } 5328 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5329 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5330 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5331 /* XXX need more */ 5332 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5333 return key_senderror(so, m, EINVAL); 5334 } 5335 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5336 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5337 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5338 } else { 5339 mode = IPSEC_MODE_ANY; 5340 reqid = 0; 5341 } 5342 5343 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5344 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5345 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5346 5347 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 5348 if (error != 0) 5349 return key_senderror(so, m, EINVAL); 5350 5351 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5352 if (error != 0) 5353 return key_senderror(so, m, EINVAL); 5354 5355 /* get a SA header */ 5356 newsah = key_getsah(&saidx, CMP_REQID); 5357 if (newsah == NULL) { 5358 /* create a new SA header */ 5359 newsah = key_newsah(&saidx); 5360 if (newsah == NULL) { 5361 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5362 return key_senderror(so, m, ENOBUFS); 5363 } 5364 } 5365 5366 /* set spidx if there */ 5367 /* XXX rewrite */ 5368 error = key_setident(newsah, m, mhp); 5369 if (error) { 5370 return key_senderror(so, m, error); 5371 } 5372 5373 { 5374 struct secasvar *sav; 5375 5376 /* We can create new SA only if SPI is differenct. */ 5377 sav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5378 if (sav != NULL) { 5379 KEY_FREESAV(&sav); 5380 IPSECLOG(LOG_DEBUG, "SA already exists.\n"); 5381 return key_senderror(so, m, EEXIST); 5382 } 5383 } 5384 5385 /* create new SA entry. */ 5386 newsav = KEY_NEWSAV(m, mhp, &error); 5387 if (newsav == NULL) { 5388 return key_senderror(so, m, error); 5389 } 5390 newsav->sah = newsah; 5391 5392 error = key_handle_natt_info(newsav, mhp); 5393 if (error != 0) { 5394 key_delsav(newsav); 5395 return key_senderror(so, m, EINVAL); 5396 } 5397 5398 error = key_init_xform(newsav); 5399 if (error != 0) { 5400 key_delsav(newsav); 5401 return key_senderror(so, m, error); 5402 } 5403 5404 /* add to satree */ 5405 newsav->refcnt = 1; 5406 newsav->state = SADB_SASTATE_MATURE; 5407 LIST_INSERT_TAIL(&newsah->savtree[SADB_SASTATE_MATURE], newsav, 5408 secasvar, chain); 5409 key_validate_savlist(newsah, SADB_SASTATE_MATURE); 5410 5411 /* 5412 * don't call key_freesav() here, as we would like to keep the SA 5413 * in the database on success. 5414 */ 5415 5416 { 5417 struct mbuf *n; 5418 5419 /* set msg buf from mhp */ 5420 n = key_getmsgbuf_x1(m, mhp); 5421 if (n == NULL) { 5422 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5423 return key_senderror(so, m, ENOBUFS); 5424 } 5425 5426 m_freem(m); 5427 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5428 } 5429 } 5430 5431 /* m is retained */ 5432 static int 5433 key_setident(struct secashead *sah, struct mbuf *m, 5434 const struct sadb_msghdr *mhp) 5435 { 5436 const struct sadb_ident *idsrc, *iddst; 5437 int idsrclen, iddstlen; 5438 5439 KASSERT(!cpu_softintr_p()); 5440 KASSERT(sah != NULL); 5441 KASSERT(m != NULL); 5442 KASSERT(mhp != NULL); 5443 KASSERT(mhp->msg != NULL); 5444 5445 /* 5446 * Can be called with an existing sah from key_api_update(). 5447 */ 5448 if (sah->idents != NULL) { 5449 kmem_free(sah->idents, sah->idents_len); 5450 sah->idents = NULL; 5451 sah->idents_len = 0; 5452 } 5453 if (sah->identd != NULL) { 5454 kmem_free(sah->identd, sah->identd_len); 5455 sah->identd = NULL; 5456 sah->identd_len = 0; 5457 } 5458 5459 /* don't make buffer if not there */ 5460 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5461 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5462 sah->idents = NULL; 5463 sah->identd = NULL; 5464 return 0; 5465 } 5466 5467 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5468 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5469 IPSECLOG(LOG_DEBUG, "invalid identity.\n"); 5470 return EINVAL; 5471 } 5472 5473 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5474 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5475 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5476 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5477 5478 /* validity check */ 5479 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5480 IPSECLOG(LOG_DEBUG, "ident type mismatch.\n"); 5481 return EINVAL; 5482 } 5483 5484 switch (idsrc->sadb_ident_type) { 5485 case SADB_IDENTTYPE_PREFIX: 5486 case SADB_IDENTTYPE_FQDN: 5487 case SADB_IDENTTYPE_USERFQDN: 5488 default: 5489 /* XXX do nothing */ 5490 sah->idents = NULL; 5491 sah->identd = NULL; 5492 return 0; 5493 } 5494 5495 /* make structure */ 5496 sah->idents = kmem_alloc(idsrclen, KM_SLEEP); 5497 sah->idents_len = idsrclen; 5498 sah->identd = kmem_alloc(iddstlen, KM_SLEEP); 5499 sah->identd_len = iddstlen; 5500 memcpy(sah->idents, idsrc, idsrclen); 5501 memcpy(sah->identd, iddst, iddstlen); 5502 5503 return 0; 5504 } 5505 5506 /* 5507 * m will not be freed on return. 5508 * it is caller's responsibility to free the result. 5509 */ 5510 static struct mbuf * 5511 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) 5512 { 5513 struct mbuf *n; 5514 5515 KASSERT(m != NULL); 5516 KASSERT(mhp != NULL); 5517 KASSERT(mhp->msg != NULL); 5518 5519 /* create new sadb_msg to reply. */ 5520 n = key_gather_mbuf(m, mhp, 1, 15, SADB_EXT_RESERVED, 5521 SADB_EXT_SA, SADB_X_EXT_SA2, 5522 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5523 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5524 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST, 5525 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT, 5526 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI, 5527 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NAT_T_FRAG); 5528 if (!n) 5529 return NULL; 5530 5531 if (n->m_len < sizeof(struct sadb_msg)) { 5532 n = m_pullup(n, sizeof(struct sadb_msg)); 5533 if (n == NULL) 5534 return NULL; 5535 } 5536 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5537 mtod(n, struct sadb_msg *)->sadb_msg_len = 5538 PFKEY_UNIT64(n->m_pkthdr.len); 5539 5540 return n; 5541 } 5542 5543 static int key_delete_all (struct socket *, struct mbuf *, 5544 const struct sadb_msghdr *, u_int16_t); 5545 5546 /* 5547 * SADB_DELETE processing 5548 * receive 5549 * <base, SA(*), address(SD)> 5550 * from the ikmpd, and set SADB_SASTATE_DEAD, 5551 * and send, 5552 * <base, SA(*), address(SD)> 5553 * to the ikmpd. 5554 * 5555 * m will always be freed. 5556 */ 5557 static int 5558 key_api_delete(struct socket *so, struct mbuf *m, 5559 const struct sadb_msghdr *mhp) 5560 { 5561 struct sadb_sa *sa0; 5562 const struct sockaddr *src, *dst; 5563 struct secasindex saidx; 5564 struct secashead *sah; 5565 struct secasvar *sav = NULL; 5566 u_int16_t proto; 5567 int error; 5568 5569 /* map satype to proto */ 5570 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5571 if (proto == 0) { 5572 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5573 return key_senderror(so, m, EINVAL); 5574 } 5575 5576 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5577 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5578 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5579 return key_senderror(so, m, EINVAL); 5580 } 5581 5582 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5583 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5584 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5585 return key_senderror(so, m, EINVAL); 5586 } 5587 5588 if (mhp->ext[SADB_EXT_SA] == NULL) { 5589 /* 5590 * Caller wants us to delete all non-LARVAL SAs 5591 * that match the src/dst. This is used during 5592 * IKE INITIAL-CONTACT. 5593 */ 5594 IPSECLOG(LOG_DEBUG, "doing delete all.\n"); 5595 return key_delete_all(so, m, mhp, proto); 5596 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5597 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5598 return key_senderror(so, m, EINVAL); 5599 } 5600 5601 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5602 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5603 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5604 5605 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5606 if (error != 0) 5607 return key_senderror(so, m, EINVAL); 5608 5609 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5610 if (error != 0) 5611 return key_senderror(so, m, EINVAL); 5612 5613 /* get a SA header */ 5614 sah = key_getsah(&saidx, CMP_HEAD); 5615 if (sah != NULL) { 5616 /* get a SA with SPI. */ 5617 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5618 } 5619 5620 if (sav == NULL) { 5621 IPSECLOG(LOG_DEBUG, "no SA found.\n"); 5622 return key_senderror(so, m, ENOENT); 5623 } 5624 5625 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5626 KEY_FREESAV(&sav); 5627 KEY_FREESAV(&sav); 5628 5629 { 5630 struct mbuf *n; 5631 5632 /* create new sadb_msg to reply. */ 5633 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5634 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5635 if (!n) 5636 return key_senderror(so, m, ENOBUFS); 5637 5638 n = key_fill_replymsg(n, 0); 5639 if (n == NULL) 5640 return key_senderror(so, m, ENOBUFS); 5641 5642 m_freem(m); 5643 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5644 } 5645 } 5646 5647 /* 5648 * delete all SAs for src/dst. Called from key_api_delete(). 5649 */ 5650 static int 5651 key_delete_all(struct socket *so, struct mbuf *m, 5652 const struct sadb_msghdr *mhp, u_int16_t proto) 5653 { 5654 const struct sockaddr *src, *dst; 5655 struct secasindex saidx; 5656 struct secashead *sah; 5657 struct secasvar *sav, *nextsav; 5658 u_int state; 5659 int error; 5660 5661 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5662 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5663 5664 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5665 if (error != 0) 5666 return key_senderror(so, m, EINVAL); 5667 5668 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5669 if (error != 0) 5670 return key_senderror(so, m, EINVAL); 5671 5672 sah = key_getsah(&saidx, CMP_HEAD); 5673 if (sah != NULL) { 5674 /* Delete all non-LARVAL SAs. */ 5675 SASTATE_ALIVE_FOREACH(state) { 5676 if (state == SADB_SASTATE_LARVAL) 5677 continue; 5678 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, 5679 nextsav) { 5680 /* sanity check */ 5681 if (sav->state != state) { 5682 IPSECLOG(LOG_DEBUG, 5683 "invalid sav->state " 5684 "(queue: %d SA: %d)\n", 5685 state, sav->state); 5686 continue; 5687 } 5688 5689 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5690 KEY_FREESAV(&sav); 5691 } 5692 } 5693 } 5694 { 5695 struct mbuf *n; 5696 5697 /* create new sadb_msg to reply. */ 5698 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5699 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5700 if (!n) 5701 return key_senderror(so, m, ENOBUFS); 5702 5703 n = key_fill_replymsg(n, 0); 5704 if (n == NULL) 5705 return key_senderror(so, m, ENOBUFS); 5706 5707 m_freem(m); 5708 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5709 } 5710 } 5711 5712 /* 5713 * SADB_GET processing 5714 * receive 5715 * <base, SA(*), address(SD)> 5716 * from the ikmpd, and get a SP and a SA to respond, 5717 * and send, 5718 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5719 * (identity(SD),) (sensitivity)> 5720 * to the ikmpd. 5721 * 5722 * m will always be freed. 5723 */ 5724 static int 5725 key_api_get(struct socket *so, struct mbuf *m, 5726 const struct sadb_msghdr *mhp) 5727 { 5728 struct sadb_sa *sa0; 5729 const struct sockaddr *src, *dst; 5730 struct secasindex saidx; 5731 struct secashead *sah; 5732 struct secasvar *sav = NULL; 5733 u_int16_t proto; 5734 int error; 5735 5736 /* map satype to proto */ 5737 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5738 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5739 return key_senderror(so, m, EINVAL); 5740 } 5741 5742 if (mhp->ext[SADB_EXT_SA] == NULL || 5743 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5744 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5745 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5746 return key_senderror(so, m, EINVAL); 5747 } 5748 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5749 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5750 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5751 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5752 return key_senderror(so, m, EINVAL); 5753 } 5754 5755 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5756 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5757 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5758 5759 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5760 if (error != 0) 5761 return key_senderror(so, m, EINVAL); 5762 5763 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5764 if (error != 0) 5765 return key_senderror(so, m, EINVAL); 5766 5767 /* get a SA header */ 5768 sah = key_getsah(&saidx, CMP_HEAD); 5769 if (sah != NULL) { 5770 /* get a SA with SPI. */ 5771 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5772 } 5773 if (sav == NULL) { 5774 IPSECLOG(LOG_DEBUG, "no SA found.\n"); 5775 return key_senderror(so, m, ENOENT); 5776 } 5777 5778 { 5779 struct mbuf *n; 5780 u_int8_t satype; 5781 5782 /* map proto to satype */ 5783 satype = key_proto2satype(sah->saidx.proto); 5784 if (satype == 0) { 5785 KEY_FREESAV(&sav); 5786 IPSECLOG(LOG_DEBUG, "there was invalid proto in SAD.\n"); 5787 return key_senderror(so, m, EINVAL); 5788 } 5789 5790 /* create new sadb_msg to reply. */ 5791 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5792 mhp->msg->sadb_msg_pid); 5793 KEY_FREESAV(&sav); 5794 if (!n) 5795 return key_senderror(so, m, ENOBUFS); 5796 5797 m_freem(m); 5798 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5799 } 5800 } 5801 5802 /* XXX make it sysctl-configurable? */ 5803 static void 5804 key_getcomb_setlifetime(struct sadb_comb *comb) 5805 { 5806 5807 comb->sadb_comb_soft_allocations = 1; 5808 comb->sadb_comb_hard_allocations = 1; 5809 comb->sadb_comb_soft_bytes = 0; 5810 comb->sadb_comb_hard_bytes = 0; 5811 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5812 comb->sadb_comb_soft_addtime = comb->sadb_comb_hard_addtime * 80 / 100; 5813 comb->sadb_comb_hard_usetime = 28800; /* 8 hours */ 5814 comb->sadb_comb_soft_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5815 } 5816 5817 /* 5818 * XXX reorder combinations by preference 5819 * XXX no idea if the user wants ESP authentication or not 5820 */ 5821 static struct mbuf * 5822 key_getcomb_esp(void) 5823 { 5824 struct sadb_comb *comb; 5825 const struct enc_xform *algo; 5826 struct mbuf *result = NULL, *m, *n; 5827 int encmin; 5828 int i, off, o; 5829 int totlen; 5830 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5831 5832 m = NULL; 5833 for (i = 1; i <= SADB_EALG_MAX; i++) { 5834 algo = esp_algorithm_lookup(i); 5835 if (algo == NULL) 5836 continue; 5837 5838 /* discard algorithms with key size smaller than system min */ 5839 if (_BITS(algo->maxkey) < ipsec_esp_keymin) 5840 continue; 5841 if (_BITS(algo->minkey) < ipsec_esp_keymin) 5842 encmin = ipsec_esp_keymin; 5843 else 5844 encmin = _BITS(algo->minkey); 5845 5846 if (ipsec_esp_auth) 5847 m = key_getcomb_ah(); 5848 else { 5849 KASSERTMSG(l <= MLEN, 5850 "l=%u > MLEN=%lu", l, (u_long) MLEN); 5851 MGET(m, M_DONTWAIT, MT_DATA); 5852 if (m) { 5853 M_ALIGN(m, l); 5854 m->m_len = l; 5855 m->m_next = NULL; 5856 memset(mtod(m, void *), 0, m->m_len); 5857 } 5858 } 5859 if (!m) 5860 goto fail; 5861 5862 totlen = 0; 5863 for (n = m; n; n = n->m_next) 5864 totlen += n->m_len; 5865 KASSERTMSG((totlen % l) == 0, "totlen=%u, l=%u", totlen, l); 5866 5867 for (off = 0; off < totlen; off += l) { 5868 n = m_pulldown(m, off, l, &o); 5869 if (!n) { 5870 /* m is already freed */ 5871 goto fail; 5872 } 5873 comb = (struct sadb_comb *)(mtod(n, char *) + o); 5874 memset(comb, 0, sizeof(*comb)); 5875 key_getcomb_setlifetime(comb); 5876 comb->sadb_comb_encrypt = i; 5877 comb->sadb_comb_encrypt_minbits = encmin; 5878 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5879 } 5880 5881 if (!result) 5882 result = m; 5883 else 5884 m_cat(result, m); 5885 } 5886 5887 return result; 5888 5889 fail: 5890 if (result) 5891 m_freem(result); 5892 return NULL; 5893 } 5894 5895 static void 5896 key_getsizes_ah(const struct auth_hash *ah, int alg, 5897 u_int16_t* ksmin, u_int16_t* ksmax) 5898 { 5899 *ksmin = *ksmax = ah->keysize; 5900 if (ah->keysize == 0) { 5901 /* 5902 * Transform takes arbitrary key size but algorithm 5903 * key size is restricted. Enforce this here. 5904 */ 5905 switch (alg) { 5906 case SADB_X_AALG_MD5: *ksmin = *ksmax = 16; break; 5907 case SADB_X_AALG_SHA: *ksmin = *ksmax = 20; break; 5908 case SADB_X_AALG_NULL: *ksmin = 0; *ksmax = 256; break; 5909 default: 5910 IPSECLOG(LOG_DEBUG, "unknown AH algorithm %u\n", alg); 5911 break; 5912 } 5913 } 5914 } 5915 5916 /* 5917 * XXX reorder combinations by preference 5918 */ 5919 static struct mbuf * 5920 key_getcomb_ah(void) 5921 { 5922 struct sadb_comb *comb; 5923 const struct auth_hash *algo; 5924 struct mbuf *m; 5925 u_int16_t minkeysize, maxkeysize; 5926 int i; 5927 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5928 5929 m = NULL; 5930 for (i = 1; i <= SADB_AALG_MAX; i++) { 5931 #if 1 5932 /* we prefer HMAC algorithms, not old algorithms */ 5933 if (i != SADB_AALG_SHA1HMAC && 5934 i != SADB_AALG_MD5HMAC && 5935 i != SADB_X_AALG_SHA2_256 && 5936 i != SADB_X_AALG_SHA2_384 && 5937 i != SADB_X_AALG_SHA2_512) 5938 continue; 5939 #endif 5940 algo = ah_algorithm_lookup(i); 5941 if (!algo) 5942 continue; 5943 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5944 /* discard algorithms with key size smaller than system min */ 5945 if (_BITS(minkeysize) < ipsec_ah_keymin) 5946 continue; 5947 5948 if (!m) { 5949 KASSERTMSG(l <= MLEN, 5950 "l=%u > MLEN=%lu", l, (u_long) MLEN); 5951 MGET(m, M_DONTWAIT, MT_DATA); 5952 if (m) { 5953 M_ALIGN(m, l); 5954 m->m_len = l; 5955 m->m_next = NULL; 5956 } 5957 } else 5958 M_PREPEND(m, l, M_DONTWAIT); 5959 if (!m) 5960 return NULL; 5961 5962 if (m->m_len < sizeof(struct sadb_comb)) { 5963 m = m_pullup(m, sizeof(struct sadb_comb)); 5964 if (m == NULL) 5965 return NULL; 5966 } 5967 5968 comb = mtod(m, struct sadb_comb *); 5969 memset(comb, 0, sizeof(*comb)); 5970 key_getcomb_setlifetime(comb); 5971 comb->sadb_comb_auth = i; 5972 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5973 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5974 } 5975 5976 return m; 5977 } 5978 5979 /* 5980 * not really an official behavior. discussed in pf_key (at) inner.net in Sep2000. 5981 * XXX reorder combinations by preference 5982 */ 5983 static struct mbuf * 5984 key_getcomb_ipcomp(void) 5985 { 5986 struct sadb_comb *comb; 5987 const struct comp_algo *algo; 5988 struct mbuf *m; 5989 int i; 5990 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5991 5992 m = NULL; 5993 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5994 algo = ipcomp_algorithm_lookup(i); 5995 if (!algo) 5996 continue; 5997 5998 if (!m) { 5999 KASSERTMSG(l <= MLEN, 6000 "l=%u > MLEN=%lu", l, (u_long) MLEN); 6001 MGET(m, M_DONTWAIT, MT_DATA); 6002 if (m) { 6003 M_ALIGN(m, l); 6004 m->m_len = l; 6005 m->m_next = NULL; 6006 } 6007 } else 6008 M_PREPEND(m, l, M_DONTWAIT); 6009 if (!m) 6010 return NULL; 6011 6012 if (m->m_len < sizeof(struct sadb_comb)) { 6013 m = m_pullup(m, sizeof(struct sadb_comb)); 6014 if (m == NULL) 6015 return NULL; 6016 } 6017 6018 comb = mtod(m, struct sadb_comb *); 6019 memset(comb, 0, sizeof(*comb)); 6020 key_getcomb_setlifetime(comb); 6021 comb->sadb_comb_encrypt = i; 6022 /* what should we set into sadb_comb_*_{min,max}bits? */ 6023 } 6024 6025 return m; 6026 } 6027 6028 /* 6029 * XXX no way to pass mode (transport/tunnel) to userland 6030 * XXX replay checking? 6031 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6032 */ 6033 static struct mbuf * 6034 key_getprop(const struct secasindex *saidx) 6035 { 6036 struct sadb_prop *prop; 6037 struct mbuf *m, *n; 6038 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6039 int totlen; 6040 6041 switch (saidx->proto) { 6042 case IPPROTO_ESP: 6043 m = key_getcomb_esp(); 6044 break; 6045 case IPPROTO_AH: 6046 m = key_getcomb_ah(); 6047 break; 6048 case IPPROTO_IPCOMP: 6049 m = key_getcomb_ipcomp(); 6050 break; 6051 default: 6052 return NULL; 6053 } 6054 6055 if (!m) 6056 return NULL; 6057 M_PREPEND(m, l, M_DONTWAIT); 6058 if (!m) 6059 return NULL; 6060 6061 totlen = 0; 6062 for (n = m; n; n = n->m_next) 6063 totlen += n->m_len; 6064 6065 prop = mtod(m, struct sadb_prop *); 6066 memset(prop, 0, sizeof(*prop)); 6067 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6068 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6069 prop->sadb_prop_replay = 32; /* XXX */ 6070 6071 return m; 6072 } 6073 6074 /* 6075 * SADB_ACQUIRE processing called by key_checkrequest() and key_api_acquire(). 6076 * send 6077 * <base, SA, address(SD), (address(P)), x_policy, 6078 * (identity(SD),) (sensitivity,) proposal> 6079 * to KMD, and expect to receive 6080 * <base> with SADB_ACQUIRE if error occurred, 6081 * or 6082 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6083 * from KMD by PF_KEY. 6084 * 6085 * XXX x_policy is outside of RFC2367 (KAME extension). 6086 * XXX sensitivity is not supported. 6087 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6088 * see comment for key_getcomb_ipcomp(). 6089 * 6090 * OUT: 6091 * 0 : succeed 6092 * others: error number 6093 */ 6094 static int 6095 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6096 { 6097 struct mbuf *result = NULL, *m; 6098 #ifndef IPSEC_NONBLOCK_ACQUIRE 6099 struct secacq *newacq; 6100 #endif 6101 u_int8_t satype; 6102 int error = -1; 6103 u_int32_t seq; 6104 6105 /* sanity check */ 6106 KASSERT(saidx != NULL); 6107 satype = key_proto2satype(saidx->proto); 6108 KASSERTMSG(satype != 0, "null satype, protocol %u", saidx->proto); 6109 6110 #ifndef IPSEC_NONBLOCK_ACQUIRE 6111 /* 6112 * We never do anything about acquirng SA. There is anather 6113 * solution that kernel blocks to send SADB_ACQUIRE message until 6114 * getting something message from IKEd. In later case, to be 6115 * managed with ACQUIRING list. 6116 */ 6117 /* Get an entry to check whether sending message or not. */ 6118 mutex_enter(&key_mtx); 6119 newacq = key_getacq(saidx); 6120 if (newacq != NULL) { 6121 if (key_blockacq_count < newacq->count) { 6122 /* reset counter and do send message. */ 6123 newacq->count = 0; 6124 } else { 6125 /* increment counter and do nothing. */ 6126 newacq->count++; 6127 mutex_exit(&key_mtx); 6128 return 0; 6129 } 6130 } else { 6131 /* make new entry for blocking to send SADB_ACQUIRE. */ 6132 newacq = key_newacq(saidx); 6133 if (newacq == NULL) 6134 return ENOBUFS; 6135 6136 /* add to acqtree */ 6137 LIST_INSERT_HEAD(&acqtree, newacq, chain); 6138 } 6139 6140 seq = newacq->seq; 6141 mutex_exit(&key_mtx); 6142 #else 6143 seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 6144 #endif 6145 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6146 if (!m) { 6147 error = ENOBUFS; 6148 goto fail; 6149 } 6150 result = m; 6151 6152 /* set sadb_address for saidx's. */ 6153 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &saidx->src.sa, FULLMASK, 6154 IPSEC_ULPROTO_ANY); 6155 if (!m) { 6156 error = ENOBUFS; 6157 goto fail; 6158 } 6159 m_cat(result, m); 6160 6161 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &saidx->dst.sa, FULLMASK, 6162 IPSEC_ULPROTO_ANY); 6163 if (!m) { 6164 error = ENOBUFS; 6165 goto fail; 6166 } 6167 m_cat(result, m); 6168 6169 /* XXX proxy address (optional) */ 6170 6171 /* set sadb_x_policy */ 6172 if (sp) { 6173 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6174 if (!m) { 6175 error = ENOBUFS; 6176 goto fail; 6177 } 6178 m_cat(result, m); 6179 } 6180 6181 /* XXX identity (optional) */ 6182 #if 0 6183 if (idexttype && fqdn) { 6184 /* create identity extension (FQDN) */ 6185 struct sadb_ident *id; 6186 int fqdnlen; 6187 6188 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6189 id = (struct sadb_ident *)p; 6190 memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6191 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6192 id->sadb_ident_exttype = idexttype; 6193 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6194 memcpy(id + 1, fqdn, fqdnlen); 6195 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6196 } 6197 6198 if (idexttype) { 6199 /* create identity extension (USERFQDN) */ 6200 struct sadb_ident *id; 6201 int userfqdnlen; 6202 6203 if (userfqdn) { 6204 /* +1 for terminating-NUL */ 6205 userfqdnlen = strlen(userfqdn) + 1; 6206 } else 6207 userfqdnlen = 0; 6208 id = (struct sadb_ident *)p; 6209 memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6210 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6211 id->sadb_ident_exttype = idexttype; 6212 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6213 /* XXX is it correct? */ 6214 if (curlwp) 6215 id->sadb_ident_id = kauth_cred_getuid(curlwp->l_cred); 6216 if (userfqdn && userfqdnlen) 6217 memcpy(id + 1, userfqdn, userfqdnlen); 6218 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6219 } 6220 #endif 6221 6222 /* XXX sensitivity (optional) */ 6223 6224 /* create proposal/combination extension */ 6225 m = key_getprop(saidx); 6226 #if 0 6227 /* 6228 * spec conformant: always attach proposal/combination extension, 6229 * the problem is that we have no way to attach it for ipcomp, 6230 * due to the way sadb_comb is declared in RFC2367. 6231 */ 6232 if (!m) { 6233 error = ENOBUFS; 6234 goto fail; 6235 } 6236 m_cat(result, m); 6237 #else 6238 /* 6239 * outside of spec; make proposal/combination extension optional. 6240 */ 6241 if (m) 6242 m_cat(result, m); 6243 #endif 6244 6245 if ((result->m_flags & M_PKTHDR) == 0) { 6246 error = EINVAL; 6247 goto fail; 6248 } 6249 6250 if (result->m_len < sizeof(struct sadb_msg)) { 6251 result = m_pullup(result, sizeof(struct sadb_msg)); 6252 if (result == NULL) { 6253 error = ENOBUFS; 6254 goto fail; 6255 } 6256 } 6257 6258 result->m_pkthdr.len = 0; 6259 for (m = result; m; m = m->m_next) 6260 result->m_pkthdr.len += m->m_len; 6261 6262 mtod(result, struct sadb_msg *)->sadb_msg_len = 6263 PFKEY_UNIT64(result->m_pkthdr.len); 6264 6265 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6266 6267 fail: 6268 if (result) 6269 m_freem(result); 6270 return error; 6271 } 6272 6273 #ifndef IPSEC_NONBLOCK_ACQUIRE 6274 static struct secacq * 6275 key_newacq(const struct secasindex *saidx) 6276 { 6277 struct secacq *newacq; 6278 6279 /* get new entry */ 6280 newacq = kmem_intr_zalloc(sizeof(struct secacq), KM_NOSLEEP); 6281 if (newacq == NULL) { 6282 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6283 return NULL; 6284 } 6285 6286 /* copy secindex */ 6287 memcpy(&newacq->saidx, saidx, sizeof(newacq->saidx)); 6288 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq); 6289 newacq->created = time_uptime; 6290 newacq->count = 0; 6291 6292 return newacq; 6293 } 6294 6295 static struct secacq * 6296 key_getacq(const struct secasindex *saidx) 6297 { 6298 struct secacq *acq; 6299 6300 KASSERT(mutex_owned(&key_mtx)); 6301 6302 LIST_FOREACH(acq, &acqtree, chain) { 6303 if (key_saidx_match(saidx, &acq->saidx, CMP_EXACTLY)) 6304 return acq; 6305 } 6306 6307 return NULL; 6308 } 6309 6310 static struct secacq * 6311 key_getacqbyseq(u_int32_t seq) 6312 { 6313 struct secacq *acq; 6314 6315 KASSERT(mutex_owned(&key_mtx)); 6316 6317 LIST_FOREACH(acq, &acqtree, chain) { 6318 if (acq->seq == seq) 6319 return acq; 6320 } 6321 6322 return NULL; 6323 } 6324 #endif 6325 6326 #ifdef notyet 6327 static struct secspacq * 6328 key_newspacq(const struct secpolicyindex *spidx) 6329 { 6330 struct secspacq *acq; 6331 6332 /* get new entry */ 6333 acq = kmem_intr_zalloc(sizeof(struct secspacq), KM_NOSLEEP); 6334 if (acq == NULL) { 6335 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6336 return NULL; 6337 } 6338 6339 /* copy secindex */ 6340 memcpy(&acq->spidx, spidx, sizeof(acq->spidx)); 6341 acq->created = time_uptime; 6342 acq->count = 0; 6343 6344 return acq; 6345 } 6346 6347 static struct secspacq * 6348 key_getspacq(const struct secpolicyindex *spidx) 6349 { 6350 struct secspacq *acq; 6351 6352 LIST_FOREACH(acq, &spacqtree, chain) { 6353 if (key_spidx_match_exactly(spidx, &acq->spidx)) 6354 return acq; 6355 } 6356 6357 return NULL; 6358 } 6359 #endif /* notyet */ 6360 6361 /* 6362 * SADB_ACQUIRE processing, 6363 * in first situation, is receiving 6364 * <base> 6365 * from the ikmpd, and clear sequence of its secasvar entry. 6366 * 6367 * In second situation, is receiving 6368 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6369 * from a user land process, and return 6370 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6371 * to the socket. 6372 * 6373 * m will always be freed. 6374 */ 6375 static int 6376 key_api_acquire(struct socket *so, struct mbuf *m, 6377 const struct sadb_msghdr *mhp) 6378 { 6379 const struct sockaddr *src, *dst; 6380 struct secasindex saidx; 6381 struct secashead *sah; 6382 u_int16_t proto; 6383 int error; 6384 6385 /* 6386 * Error message from KMd. 6387 * We assume that if error was occurred in IKEd, the length of PFKEY 6388 * message is equal to the size of sadb_msg structure. 6389 * We do not raise error even if error occurred in this function. 6390 */ 6391 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6392 #ifndef IPSEC_NONBLOCK_ACQUIRE 6393 struct secacq *acq; 6394 6395 /* check sequence number */ 6396 if (mhp->msg->sadb_msg_seq == 0) { 6397 IPSECLOG(LOG_DEBUG, "must specify sequence number.\n"); 6398 m_freem(m); 6399 return 0; 6400 } 6401 6402 mutex_enter(&key_mtx); 6403 acq = key_getacqbyseq(mhp->msg->sadb_msg_seq); 6404 if (acq == NULL) { 6405 mutex_exit(&key_mtx); 6406 /* 6407 * the specified larval SA is already gone, or we got 6408 * a bogus sequence number. we can silently ignore it. 6409 */ 6410 m_freem(m); 6411 return 0; 6412 } 6413 6414 /* reset acq counter in order to deletion by timehander. */ 6415 acq->created = time_uptime; 6416 acq->count = 0; 6417 mutex_exit(&key_mtx); 6418 #endif 6419 m_freem(m); 6420 return 0; 6421 } 6422 6423 /* 6424 * This message is from user land. 6425 */ 6426 6427 /* map satype to proto */ 6428 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 6429 if (proto == 0) { 6430 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6431 return key_senderror(so, m, EINVAL); 6432 } 6433 6434 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6435 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6436 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6437 /* error */ 6438 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 6439 return key_senderror(so, m, EINVAL); 6440 } 6441 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6442 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6443 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6444 /* error */ 6445 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 6446 return key_senderror(so, m, EINVAL); 6447 } 6448 6449 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 6450 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 6451 6452 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 6453 if (error != 0) 6454 return key_senderror(so, m, EINVAL); 6455 6456 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 6457 if (error != 0) 6458 return key_senderror(so, m, EINVAL); 6459 6460 /* get a SA index */ 6461 sah = key_getsah(&saidx, CMP_MODE_REQID); 6462 if (sah != NULL) { 6463 IPSECLOG(LOG_DEBUG, "a SA exists already.\n"); 6464 return key_senderror(so, m, EEXIST); 6465 } 6466 6467 error = key_acquire(&saidx, NULL); 6468 if (error != 0) { 6469 IPSECLOG(LOG_DEBUG, "error %d returned from key_acquire.\n", 6470 error); 6471 return key_senderror(so, m, error); 6472 } 6473 6474 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6475 } 6476 6477 /* 6478 * SADB_REGISTER processing. 6479 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6480 * receive 6481 * <base> 6482 * from the ikmpd, and register a socket to send PF_KEY messages, 6483 * and send 6484 * <base, supported> 6485 * to KMD by PF_KEY. 6486 * If socket is detached, must free from regnode. 6487 * 6488 * m will always be freed. 6489 */ 6490 static int 6491 key_api_register(struct socket *so, struct mbuf *m, 6492 const struct sadb_msghdr *mhp) 6493 { 6494 struct secreg *reg, *newreg = 0; 6495 6496 /* check for invalid register message */ 6497 if (mhp->msg->sadb_msg_satype >= __arraycount(regtree)) 6498 return key_senderror(so, m, EINVAL); 6499 6500 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6501 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6502 goto setmsg; 6503 6504 /* Allocate regnode in advance, out of mutex */ 6505 newreg = kmem_zalloc(sizeof(*newreg), KM_SLEEP); 6506 6507 /* check whether existing or not */ 6508 mutex_enter(&key_mtx); 6509 LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) { 6510 if (reg->so == so) { 6511 IPSECLOG(LOG_DEBUG, "socket exists already.\n"); 6512 mutex_exit(&key_mtx); 6513 kmem_free(newreg, sizeof(*newreg)); 6514 return key_senderror(so, m, EEXIST); 6515 } 6516 } 6517 6518 newreg->so = so; 6519 ((struct keycb *)sotorawcb(so))->kp_registered++; 6520 6521 /* add regnode to regtree. */ 6522 LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain); 6523 mutex_exit(&key_mtx); 6524 6525 setmsg: 6526 { 6527 struct mbuf *n; 6528 struct sadb_supported *sup; 6529 u_int len, alen, elen; 6530 int off; 6531 int i; 6532 struct sadb_alg *alg; 6533 6534 /* create new sadb_msg to reply. */ 6535 alen = 0; 6536 for (i = 1; i <= SADB_AALG_MAX; i++) { 6537 if (ah_algorithm_lookup(i)) 6538 alen += sizeof(struct sadb_alg); 6539 } 6540 if (alen) 6541 alen += sizeof(struct sadb_supported); 6542 elen = 0; 6543 for (i = 1; i <= SADB_EALG_MAX; i++) { 6544 if (esp_algorithm_lookup(i)) 6545 elen += sizeof(struct sadb_alg); 6546 } 6547 if (elen) 6548 elen += sizeof(struct sadb_supported); 6549 6550 len = sizeof(struct sadb_msg) + alen + elen; 6551 6552 if (len > MCLBYTES) 6553 return key_senderror(so, m, ENOBUFS); 6554 6555 MGETHDR(n, M_DONTWAIT, MT_DATA); 6556 if (len > MHLEN) { 6557 MCLGET(n, M_DONTWAIT); 6558 if ((n->m_flags & M_EXT) == 0) { 6559 m_freem(n); 6560 n = NULL; 6561 } 6562 } 6563 if (!n) 6564 return key_senderror(so, m, ENOBUFS); 6565 6566 n->m_pkthdr.len = n->m_len = len; 6567 n->m_next = NULL; 6568 off = 0; 6569 6570 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); 6571 n = key_fill_replymsg(n, 0); 6572 if (n == NULL) 6573 return key_senderror(so, m, ENOBUFS); 6574 6575 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6576 6577 /* for authentication algorithm */ 6578 if (alen) { 6579 sup = (struct sadb_supported *)(mtod(n, char *) + off); 6580 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6581 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6582 off += PFKEY_ALIGN8(sizeof(*sup)); 6583 6584 for (i = 1; i <= SADB_AALG_MAX; i++) { 6585 const struct auth_hash *aalgo; 6586 u_int16_t minkeysize, maxkeysize; 6587 6588 aalgo = ah_algorithm_lookup(i); 6589 if (!aalgo) 6590 continue; 6591 alg = (struct sadb_alg *)(mtod(n, char *) + off); 6592 alg->sadb_alg_id = i; 6593 alg->sadb_alg_ivlen = 0; 6594 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6595 alg->sadb_alg_minbits = _BITS(minkeysize); 6596 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6597 off += PFKEY_ALIGN8(sizeof(*alg)); 6598 } 6599 } 6600 6601 /* for encryption algorithm */ 6602 if (elen) { 6603 sup = (struct sadb_supported *)(mtod(n, char *) + off); 6604 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6605 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6606 off += PFKEY_ALIGN8(sizeof(*sup)); 6607 6608 for (i = 1; i <= SADB_EALG_MAX; i++) { 6609 const struct enc_xform *ealgo; 6610 6611 ealgo = esp_algorithm_lookup(i); 6612 if (!ealgo) 6613 continue; 6614 alg = (struct sadb_alg *)(mtod(n, char *) + off); 6615 alg->sadb_alg_id = i; 6616 alg->sadb_alg_ivlen = ealgo->blocksize; 6617 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6618 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6619 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6620 } 6621 } 6622 6623 KASSERTMSG(off == len, "length inconsistency"); 6624 6625 m_freem(m); 6626 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6627 } 6628 } 6629 6630 /* 6631 * free secreg entry registered. 6632 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6633 */ 6634 void 6635 key_freereg(struct socket *so) 6636 { 6637 struct secreg *reg; 6638 int i; 6639 6640 KASSERT(!cpu_softintr_p()); 6641 KASSERT(so != NULL); 6642 6643 /* 6644 * check whether existing or not. 6645 * check all type of SA, because there is a potential that 6646 * one socket is registered to multiple type of SA. 6647 */ 6648 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6649 mutex_enter(&key_mtx); 6650 LIST_FOREACH(reg, ®tree[i], chain) { 6651 if (reg->so == so) { 6652 LIST_REMOVE(reg, chain); 6653 break; 6654 } 6655 } 6656 mutex_exit(&key_mtx); 6657 if (reg != NULL) 6658 kmem_free(reg, sizeof(*reg)); 6659 } 6660 6661 return; 6662 } 6663 6664 /* 6665 * SADB_EXPIRE processing 6666 * send 6667 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6668 * to KMD by PF_KEY. 6669 * NOTE: We send only soft lifetime extension. 6670 * 6671 * OUT: 0 : succeed 6672 * others : error number 6673 */ 6674 static int 6675 key_expire(struct secasvar *sav) 6676 { 6677 int s; 6678 int satype; 6679 struct mbuf *result = NULL, *m; 6680 int len; 6681 int error = -1; 6682 struct sadb_lifetime *lt; 6683 6684 /* XXX: Why do we lock ? */ 6685 s = splsoftnet(); /*called from softclock()*/ 6686 6687 KASSERT(sav != NULL); 6688 6689 satype = key_proto2satype(sav->sah->saidx.proto); 6690 KASSERTMSG(satype != 0, "invalid proto is passed"); 6691 6692 /* set msg header */ 6693 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6694 if (!m) { 6695 error = ENOBUFS; 6696 goto fail; 6697 } 6698 result = m; 6699 6700 /* create SA extension */ 6701 m = key_setsadbsa(sav); 6702 if (!m) { 6703 error = ENOBUFS; 6704 goto fail; 6705 } 6706 m_cat(result, m); 6707 6708 /* create SA extension */ 6709 m = key_setsadbxsa2(sav->sah->saidx.mode, 6710 sav->replay ? sav->replay->count : 0, sav->sah->saidx.reqid); 6711 if (!m) { 6712 error = ENOBUFS; 6713 goto fail; 6714 } 6715 m_cat(result, m); 6716 6717 /* create lifetime extension (current and soft) */ 6718 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6719 m = key_alloc_mbuf(len); 6720 if (!m || m->m_next) { /*XXX*/ 6721 if (m) 6722 m_freem(m); 6723 error = ENOBUFS; 6724 goto fail; 6725 } 6726 memset(mtod(m, void *), 0, len); 6727 lt = mtod(m, struct sadb_lifetime *); 6728 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6729 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6730 lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations; 6731 lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes; 6732 lt->sadb_lifetime_addtime = 6733 time_mono_to_wall(sav->lft_c->sadb_lifetime_addtime); 6734 lt->sadb_lifetime_usetime = 6735 time_mono_to_wall(sav->lft_c->sadb_lifetime_usetime); 6736 lt = (struct sadb_lifetime *)(mtod(m, char *) + len / 2); 6737 memcpy(lt, sav->lft_s, sizeof(*lt)); 6738 m_cat(result, m); 6739 6740 /* set sadb_address for source */ 6741 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sav->sah->saidx.src.sa, 6742 FULLMASK, IPSEC_ULPROTO_ANY); 6743 if (!m) { 6744 error = ENOBUFS; 6745 goto fail; 6746 } 6747 m_cat(result, m); 6748 6749 /* set sadb_address for destination */ 6750 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sav->sah->saidx.dst.sa, 6751 FULLMASK, IPSEC_ULPROTO_ANY); 6752 if (!m) { 6753 error = ENOBUFS; 6754 goto fail; 6755 } 6756 m_cat(result, m); 6757 6758 if ((result->m_flags & M_PKTHDR) == 0) { 6759 error = EINVAL; 6760 goto fail; 6761 } 6762 6763 if (result->m_len < sizeof(struct sadb_msg)) { 6764 result = m_pullup(result, sizeof(struct sadb_msg)); 6765 if (result == NULL) { 6766 error = ENOBUFS; 6767 goto fail; 6768 } 6769 } 6770 6771 result->m_pkthdr.len = 0; 6772 for (m = result; m; m = m->m_next) 6773 result->m_pkthdr.len += m->m_len; 6774 6775 mtod(result, struct sadb_msg *)->sadb_msg_len = 6776 PFKEY_UNIT64(result->m_pkthdr.len); 6777 6778 splx(s); 6779 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6780 6781 fail: 6782 if (result) 6783 m_freem(result); 6784 splx(s); 6785 return error; 6786 } 6787 6788 /* 6789 * SADB_FLUSH processing 6790 * receive 6791 * <base> 6792 * from the ikmpd, and free all entries in secastree. 6793 * and send, 6794 * <base> 6795 * to the ikmpd. 6796 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6797 * 6798 * m will always be freed. 6799 */ 6800 static int 6801 key_api_flush(struct socket *so, struct mbuf *m, 6802 const struct sadb_msghdr *mhp) 6803 { 6804 struct sadb_msg *newmsg; 6805 struct secashead *sah; 6806 struct secasvar *sav, *nextsav; 6807 u_int16_t proto; 6808 u_int8_t state; 6809 6810 /* map satype to proto */ 6811 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 6812 if (proto == 0) { 6813 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6814 return key_senderror(so, m, EINVAL); 6815 } 6816 6817 /* no SATYPE specified, i.e. flushing all SA. */ 6818 LIST_FOREACH(sah, &sahtree, chain) { 6819 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC && 6820 proto != sah->saidx.proto) 6821 continue; 6822 6823 SASTATE_ALIVE_FOREACH(state) { 6824 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, 6825 nextsav) { 6826 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6827 KEY_FREESAV(&sav); 6828 } 6829 } 6830 6831 sah->state = SADB_SASTATE_DEAD; 6832 } 6833 6834 if (m->m_len < sizeof(struct sadb_msg) || 6835 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6836 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6837 return key_senderror(so, m, ENOBUFS); 6838 } 6839 6840 if (m->m_next) 6841 m_freem(m->m_next); 6842 m->m_next = NULL; 6843 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6844 newmsg = mtod(m, struct sadb_msg *); 6845 newmsg->sadb_msg_errno = 0; 6846 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6847 6848 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6849 } 6850 6851 6852 static struct mbuf * 6853 key_setdump_chain(u_int8_t req_satype, int *errorp, int *lenp, pid_t pid) 6854 { 6855 struct secashead *sah; 6856 struct secasvar *sav; 6857 u_int16_t proto; 6858 u_int8_t satype; 6859 u_int8_t state; 6860 int cnt; 6861 struct mbuf *m, *n, *prev; 6862 6863 *lenp = 0; 6864 6865 /* map satype to proto */ 6866 proto = key_satype2proto(req_satype); 6867 if (proto == 0) { 6868 *errorp = EINVAL; 6869 return (NULL); 6870 } 6871 6872 /* count sav entries to be sent to userland. */ 6873 cnt = 0; 6874 LIST_FOREACH(sah, &sahtree, chain) { 6875 if (req_satype != SADB_SATYPE_UNSPEC && 6876 proto != sah->saidx.proto) 6877 continue; 6878 6879 SASTATE_ANY_FOREACH(state) { 6880 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6881 cnt++; 6882 } 6883 } 6884 } 6885 6886 if (cnt == 0) { 6887 *errorp = ENOENT; 6888 return (NULL); 6889 } 6890 6891 /* send this to the userland, one at a time. */ 6892 m = NULL; 6893 prev = m; 6894 LIST_FOREACH(sah, &sahtree, chain) { 6895 if (req_satype != SADB_SATYPE_UNSPEC && 6896 proto != sah->saidx.proto) 6897 continue; 6898 6899 /* map proto to satype */ 6900 satype = key_proto2satype(sah->saidx.proto); 6901 if (satype == 0) { 6902 m_freem(m); 6903 *errorp = EINVAL; 6904 return (NULL); 6905 } 6906 6907 SASTATE_ANY_FOREACH(state) { 6908 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6909 n = key_setdumpsa(sav, SADB_DUMP, satype, 6910 --cnt, pid); 6911 if (!n) { 6912 m_freem(m); 6913 *errorp = ENOBUFS; 6914 return (NULL); 6915 } 6916 6917 if (!m) 6918 m = n; 6919 else 6920 prev->m_nextpkt = n; 6921 prev = n; 6922 } 6923 } 6924 } 6925 6926 if (!m) { 6927 *errorp = EINVAL; 6928 return (NULL); 6929 } 6930 6931 if ((m->m_flags & M_PKTHDR) != 0) { 6932 m->m_pkthdr.len = 0; 6933 for (n = m; n; n = n->m_next) 6934 m->m_pkthdr.len += n->m_len; 6935 } 6936 6937 *errorp = 0; 6938 return (m); 6939 } 6940 6941 /* 6942 * SADB_DUMP processing 6943 * dump all entries including status of DEAD in SAD. 6944 * receive 6945 * <base> 6946 * from the ikmpd, and dump all secasvar leaves 6947 * and send, 6948 * <base> ..... 6949 * to the ikmpd. 6950 * 6951 * m will always be freed. 6952 */ 6953 static int 6954 key_api_dump(struct socket *so, struct mbuf *m0, 6955 const struct sadb_msghdr *mhp) 6956 { 6957 u_int16_t proto; 6958 u_int8_t satype; 6959 struct mbuf *n; 6960 int s; 6961 int error, len, ok; 6962 6963 /* map satype to proto */ 6964 satype = mhp->msg->sadb_msg_satype; 6965 proto = key_satype2proto(satype); 6966 if (proto == 0) { 6967 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6968 return key_senderror(so, m0, EINVAL); 6969 } 6970 6971 /* 6972 * If the requestor has insufficient socket-buffer space 6973 * for the entire chain, nobody gets any response to the DUMP. 6974 * XXX For now, only the requestor ever gets anything. 6975 * Moreover, if the requestor has any space at all, they receive 6976 * the entire chain, otherwise the request is refused with ENOBUFS. 6977 */ 6978 if (sbspace(&so->so_rcv) <= 0) { 6979 return key_senderror(so, m0, ENOBUFS); 6980 } 6981 6982 s = splsoftnet(); 6983 n = key_setdump_chain(satype, &error, &len, mhp->msg->sadb_msg_pid); 6984 splx(s); 6985 6986 if (n == NULL) { 6987 return key_senderror(so, m0, ENOENT); 6988 } 6989 { 6990 uint64_t *ps = PFKEY_STAT_GETREF(); 6991 ps[PFKEY_STAT_IN_TOTAL]++; 6992 ps[PFKEY_STAT_IN_BYTES] += len; 6993 PFKEY_STAT_PUTREF(); 6994 } 6995 6996 /* 6997 * PF_KEY DUMP responses are no longer broadcast to all PF_KEY sockets. 6998 * The requestor receives either the entire chain, or an 6999 * error message with ENOBUFS. 7000 * 7001 * sbappendaddrchain() takes the chain of entries, one 7002 * packet-record per SPD entry, prepends the key_src sockaddr 7003 * to each packet-record, links the sockaddr mbufs into a new 7004 * list of records, then appends the entire resulting 7005 * list to the requesting socket. 7006 */ 7007 ok = sbappendaddrchain(&so->so_rcv, (struct sockaddr *)&key_src, n, 7008 SB_PRIO_ONESHOT_OVERFLOW); 7009 7010 if (!ok) { 7011 PFKEY_STATINC(PFKEY_STAT_IN_NOMEM); 7012 m_freem(n); 7013 return key_senderror(so, m0, ENOBUFS); 7014 } 7015 7016 m_freem(m0); 7017 return 0; 7018 } 7019 7020 /* 7021 * SADB_X_PROMISC processing 7022 * 7023 * m will always be freed. 7024 */ 7025 static int 7026 key_api_promisc(struct socket *so, struct mbuf *m, 7027 const struct sadb_msghdr *mhp) 7028 { 7029 int olen; 7030 7031 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7032 7033 if (olen < sizeof(struct sadb_msg)) { 7034 #if 1 7035 return key_senderror(so, m, EINVAL); 7036 #else 7037 m_freem(m); 7038 return 0; 7039 #endif 7040 } else if (olen == sizeof(struct sadb_msg)) { 7041 /* enable/disable promisc mode */ 7042 struct keycb *kp = (struct keycb *)sotorawcb(so); 7043 if (kp == NULL) 7044 return key_senderror(so, m, EINVAL); 7045 mhp->msg->sadb_msg_errno = 0; 7046 switch (mhp->msg->sadb_msg_satype) { 7047 case 0: 7048 case 1: 7049 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7050 break; 7051 default: 7052 return key_senderror(so, m, EINVAL); 7053 } 7054 7055 /* send the original message back to everyone */ 7056 mhp->msg->sadb_msg_errno = 0; 7057 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7058 } else { 7059 /* send packet as is */ 7060 7061 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7062 7063 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7064 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7065 } 7066 } 7067 7068 static int (*key_api_typesw[]) (struct socket *, struct mbuf *, 7069 const struct sadb_msghdr *) = { 7070 NULL, /* SADB_RESERVED */ 7071 key_api_getspi, /* SADB_GETSPI */ 7072 key_api_update, /* SADB_UPDATE */ 7073 key_api_add, /* SADB_ADD */ 7074 key_api_delete, /* SADB_DELETE */ 7075 key_api_get, /* SADB_GET */ 7076 key_api_acquire, /* SADB_ACQUIRE */ 7077 key_api_register, /* SADB_REGISTER */ 7078 NULL, /* SADB_EXPIRE */ 7079 key_api_flush, /* SADB_FLUSH */ 7080 key_api_dump, /* SADB_DUMP */ 7081 key_api_promisc, /* SADB_X_PROMISC */ 7082 NULL, /* SADB_X_PCHANGE */ 7083 key_api_spdadd, /* SADB_X_SPDUPDATE */ 7084 key_api_spdadd, /* SADB_X_SPDADD */ 7085 key_api_spddelete, /* SADB_X_SPDDELETE */ 7086 key_api_spdget, /* SADB_X_SPDGET */ 7087 NULL, /* SADB_X_SPDACQUIRE */ 7088 key_api_spddump, /* SADB_X_SPDDUMP */ 7089 key_api_spdflush, /* SADB_X_SPDFLUSH */ 7090 key_api_spdadd, /* SADB_X_SPDSETIDX */ 7091 NULL, /* SADB_X_SPDEXPIRE */ 7092 key_api_spddelete2, /* SADB_X_SPDDELETE2 */ 7093 key_api_nat_map, /* SADB_X_NAT_T_NEW_MAPPING */ 7094 }; 7095 7096 /* 7097 * parse sadb_msg buffer to process PFKEYv2, 7098 * and create a data to response if needed. 7099 * I think to be dealed with mbuf directly. 7100 * IN: 7101 * msgp : pointer to pointer to a received buffer pulluped. 7102 * This is rewrited to response. 7103 * so : pointer to socket. 7104 * OUT: 7105 * length for buffer to send to user process. 7106 */ 7107 int 7108 key_parse(struct mbuf *m, struct socket *so) 7109 { 7110 struct sadb_msg *msg; 7111 struct sadb_msghdr mh; 7112 u_int orglen; 7113 int error; 7114 7115 KASSERT(m != NULL); 7116 KASSERT(so != NULL); 7117 7118 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7119 if (KEYDEBUG_ON(KEYDEBUG_KEY_DUMP)) { 7120 IPSECLOG(LOG_DEBUG, "passed sadb_msg\n"); 7121 kdebug_sadb(msg); 7122 } 7123 #endif 7124 7125 if (m->m_len < sizeof(struct sadb_msg)) { 7126 m = m_pullup(m, sizeof(struct sadb_msg)); 7127 if (!m) 7128 return ENOBUFS; 7129 } 7130 msg = mtod(m, struct sadb_msg *); 7131 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7132 7133 if ((m->m_flags & M_PKTHDR) == 0 || 7134 m->m_pkthdr.len != orglen) { 7135 IPSECLOG(LOG_DEBUG, "invalid message length.\n"); 7136 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7137 error = EINVAL; 7138 goto senderror; 7139 } 7140 7141 if (msg->sadb_msg_version != PF_KEY_V2) { 7142 IPSECLOG(LOG_DEBUG, "PF_KEY version %u is mismatched.\n", 7143 msg->sadb_msg_version); 7144 PFKEY_STATINC(PFKEY_STAT_OUT_INVVER); 7145 error = EINVAL; 7146 goto senderror; 7147 } 7148 7149 if (msg->sadb_msg_type > SADB_MAX) { 7150 IPSECLOG(LOG_DEBUG, "invalid type %u is passed.\n", 7151 msg->sadb_msg_type); 7152 PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); 7153 error = EINVAL; 7154 goto senderror; 7155 } 7156 7157 /* for old-fashioned code - should be nuked */ 7158 if (m->m_pkthdr.len > MCLBYTES) { 7159 m_freem(m); 7160 return ENOBUFS; 7161 } 7162 if (m->m_next) { 7163 struct mbuf *n; 7164 7165 MGETHDR(n, M_DONTWAIT, MT_DATA); 7166 if (n && m->m_pkthdr.len > MHLEN) { 7167 MCLGET(n, M_DONTWAIT); 7168 if ((n->m_flags & M_EXT) == 0) { 7169 m_free(n); 7170 n = NULL; 7171 } 7172 } 7173 if (!n) { 7174 m_freem(m); 7175 return ENOBUFS; 7176 } 7177 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, void *)); 7178 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7179 n->m_next = NULL; 7180 m_freem(m); 7181 m = n; 7182 } 7183 7184 /* align the mbuf chain so that extensions are in contiguous region. */ 7185 error = key_align(m, &mh); 7186 if (error) 7187 return error; 7188 7189 if (m->m_next) { /*XXX*/ 7190 m_freem(m); 7191 return ENOBUFS; 7192 } 7193 7194 msg = mh.msg; 7195 7196 /* check SA type */ 7197 switch (msg->sadb_msg_satype) { 7198 case SADB_SATYPE_UNSPEC: 7199 switch (msg->sadb_msg_type) { 7200 case SADB_GETSPI: 7201 case SADB_UPDATE: 7202 case SADB_ADD: 7203 case SADB_DELETE: 7204 case SADB_GET: 7205 case SADB_ACQUIRE: 7206 case SADB_EXPIRE: 7207 IPSECLOG(LOG_DEBUG, 7208 "must specify satype when msg type=%u.\n", 7209 msg->sadb_msg_type); 7210 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7211 error = EINVAL; 7212 goto senderror; 7213 } 7214 break; 7215 case SADB_SATYPE_AH: 7216 case SADB_SATYPE_ESP: 7217 case SADB_X_SATYPE_IPCOMP: 7218 case SADB_X_SATYPE_TCPSIGNATURE: 7219 switch (msg->sadb_msg_type) { 7220 case SADB_X_SPDADD: 7221 case SADB_X_SPDDELETE: 7222 case SADB_X_SPDGET: 7223 case SADB_X_SPDDUMP: 7224 case SADB_X_SPDFLUSH: 7225 case SADB_X_SPDSETIDX: 7226 case SADB_X_SPDUPDATE: 7227 case SADB_X_SPDDELETE2: 7228 IPSECLOG(LOG_DEBUG, "illegal satype=%u\n", 7229 msg->sadb_msg_type); 7230 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7231 error = EINVAL; 7232 goto senderror; 7233 } 7234 break; 7235 case SADB_SATYPE_RSVP: 7236 case SADB_SATYPE_OSPFV2: 7237 case SADB_SATYPE_RIPV2: 7238 case SADB_SATYPE_MIP: 7239 IPSECLOG(LOG_DEBUG, "type %u isn't supported.\n", 7240 msg->sadb_msg_satype); 7241 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7242 error = EOPNOTSUPP; 7243 goto senderror; 7244 case 1: /* XXX: What does it do? */ 7245 if (msg->sadb_msg_type == SADB_X_PROMISC) 7246 break; 7247 /*FALLTHROUGH*/ 7248 default: 7249 IPSECLOG(LOG_DEBUG, "invalid type %u is passed.\n", 7250 msg->sadb_msg_satype); 7251 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7252 error = EINVAL; 7253 goto senderror; 7254 } 7255 7256 /* check field of upper layer protocol and address family */ 7257 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL && 7258 mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7259 struct sadb_address *src0, *dst0; 7260 u_int plen; 7261 7262 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7263 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7264 7265 /* check upper layer protocol */ 7266 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7267 IPSECLOG(LOG_DEBUG, "upper layer protocol mismatched.\n"); 7268 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7269 error = EINVAL; 7270 goto senderror; 7271 } 7272 7273 /* check family */ 7274 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7275 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7276 IPSECLOG(LOG_DEBUG, "address family mismatched.\n"); 7277 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7278 error = EINVAL; 7279 goto senderror; 7280 } 7281 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7282 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7283 IPSECLOG(LOG_DEBUG, 7284 "address struct size mismatched.\n"); 7285 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7286 error = EINVAL; 7287 goto senderror; 7288 } 7289 7290 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7291 case AF_INET: 7292 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7293 sizeof(struct sockaddr_in)) { 7294 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7295 error = EINVAL; 7296 goto senderror; 7297 } 7298 break; 7299 case AF_INET6: 7300 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7301 sizeof(struct sockaddr_in6)) { 7302 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7303 error = EINVAL; 7304 goto senderror; 7305 } 7306 break; 7307 default: 7308 IPSECLOG(LOG_DEBUG, "unsupported address family.\n"); 7309 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7310 error = EAFNOSUPPORT; 7311 goto senderror; 7312 } 7313 7314 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7315 case AF_INET: 7316 plen = sizeof(struct in_addr) << 3; 7317 break; 7318 case AF_INET6: 7319 plen = sizeof(struct in6_addr) << 3; 7320 break; 7321 default: 7322 plen = 0; /*fool gcc*/ 7323 break; 7324 } 7325 7326 /* check max prefix length */ 7327 if (src0->sadb_address_prefixlen > plen || 7328 dst0->sadb_address_prefixlen > plen) { 7329 IPSECLOG(LOG_DEBUG, "illegal prefixlen.\n"); 7330 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7331 error = EINVAL; 7332 goto senderror; 7333 } 7334 7335 /* 7336 * prefixlen == 0 is valid because there can be a case when 7337 * all addresses are matched. 7338 */ 7339 } 7340 7341 if (msg->sadb_msg_type >= __arraycount(key_api_typesw) || 7342 key_api_typesw[msg->sadb_msg_type] == NULL) { 7343 PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); 7344 error = EINVAL; 7345 goto senderror; 7346 } 7347 7348 return (*key_api_typesw[msg->sadb_msg_type])(so, m, &mh); 7349 7350 senderror: 7351 return key_senderror(so, m, error); 7352 } 7353 7354 static int 7355 key_senderror(struct socket *so, struct mbuf *m, int code) 7356 { 7357 struct sadb_msg *msg; 7358 7359 KASSERT(m->m_len >= sizeof(struct sadb_msg)); 7360 7361 msg = mtod(m, struct sadb_msg *); 7362 msg->sadb_msg_errno = code; 7363 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7364 } 7365 7366 /* 7367 * set the pointer to each header into message buffer. 7368 * m will be freed on error. 7369 * XXX larger-than-MCLBYTES extension? 7370 */ 7371 static int 7372 key_align(struct mbuf *m, struct sadb_msghdr *mhp) 7373 { 7374 struct mbuf *n; 7375 struct sadb_ext *ext; 7376 size_t off, end; 7377 int extlen; 7378 int toff; 7379 7380 KASSERT(m != NULL); 7381 KASSERT(mhp != NULL); 7382 KASSERT(m->m_len >= sizeof(struct sadb_msg)); 7383 7384 /* initialize */ 7385 memset(mhp, 0, sizeof(*mhp)); 7386 7387 mhp->msg = mtod(m, struct sadb_msg *); 7388 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7389 7390 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7391 extlen = end; /*just in case extlen is not updated*/ 7392 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7393 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7394 if (!n) { 7395 /* m is already freed */ 7396 return ENOBUFS; 7397 } 7398 ext = (struct sadb_ext *)(mtod(n, char *) + toff); 7399 7400 /* set pointer */ 7401 switch (ext->sadb_ext_type) { 7402 case SADB_EXT_SA: 7403 case SADB_EXT_ADDRESS_SRC: 7404 case SADB_EXT_ADDRESS_DST: 7405 case SADB_EXT_ADDRESS_PROXY: 7406 case SADB_EXT_LIFETIME_CURRENT: 7407 case SADB_EXT_LIFETIME_HARD: 7408 case SADB_EXT_LIFETIME_SOFT: 7409 case SADB_EXT_KEY_AUTH: 7410 case SADB_EXT_KEY_ENCRYPT: 7411 case SADB_EXT_IDENTITY_SRC: 7412 case SADB_EXT_IDENTITY_DST: 7413 case SADB_EXT_SENSITIVITY: 7414 case SADB_EXT_PROPOSAL: 7415 case SADB_EXT_SUPPORTED_AUTH: 7416 case SADB_EXT_SUPPORTED_ENCRYPT: 7417 case SADB_EXT_SPIRANGE: 7418 case SADB_X_EXT_POLICY: 7419 case SADB_X_EXT_SA2: 7420 case SADB_X_EXT_NAT_T_TYPE: 7421 case SADB_X_EXT_NAT_T_SPORT: 7422 case SADB_X_EXT_NAT_T_DPORT: 7423 case SADB_X_EXT_NAT_T_OAI: 7424 case SADB_X_EXT_NAT_T_OAR: 7425 case SADB_X_EXT_NAT_T_FRAG: 7426 /* duplicate check */ 7427 /* 7428 * XXX Are there duplication payloads of either 7429 * KEY_AUTH or KEY_ENCRYPT ? 7430 */ 7431 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7432 IPSECLOG(LOG_DEBUG, 7433 "duplicate ext_type %u is passed.\n", 7434 ext->sadb_ext_type); 7435 m_freem(m); 7436 PFKEY_STATINC(PFKEY_STAT_OUT_DUPEXT); 7437 return EINVAL; 7438 } 7439 break; 7440 default: 7441 IPSECLOG(LOG_DEBUG, "invalid ext_type %u is passed.\n", 7442 ext->sadb_ext_type); 7443 m_freem(m); 7444 PFKEY_STATINC(PFKEY_STAT_OUT_INVEXTTYPE); 7445 return EINVAL; 7446 } 7447 7448 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7449 7450 if (key_validate_ext(ext, extlen)) { 7451 m_freem(m); 7452 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7453 return EINVAL; 7454 } 7455 7456 n = m_pulldown(m, off, extlen, &toff); 7457 if (!n) { 7458 /* m is already freed */ 7459 return ENOBUFS; 7460 } 7461 ext = (struct sadb_ext *)(mtod(n, char *) + toff); 7462 7463 mhp->ext[ext->sadb_ext_type] = ext; 7464 mhp->extoff[ext->sadb_ext_type] = off; 7465 mhp->extlen[ext->sadb_ext_type] = extlen; 7466 } 7467 7468 if (off != end) { 7469 m_freem(m); 7470 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7471 return EINVAL; 7472 } 7473 7474 return 0; 7475 } 7476 7477 static int 7478 key_validate_ext(const struct sadb_ext *ext, int len) 7479 { 7480 const struct sockaddr *sa; 7481 enum { NONE, ADDR } checktype = NONE; 7482 int baselen = 0; 7483 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7484 7485 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7486 return EINVAL; 7487 7488 /* if it does not match minimum/maximum length, bail */ 7489 if (ext->sadb_ext_type >= __arraycount(minsize) || 7490 ext->sadb_ext_type >= __arraycount(maxsize)) 7491 return EINVAL; 7492 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7493 return EINVAL; 7494 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7495 return EINVAL; 7496 7497 /* more checks based on sadb_ext_type XXX need more */ 7498 switch (ext->sadb_ext_type) { 7499 case SADB_EXT_ADDRESS_SRC: 7500 case SADB_EXT_ADDRESS_DST: 7501 case SADB_EXT_ADDRESS_PROXY: 7502 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7503 checktype = ADDR; 7504 break; 7505 case SADB_EXT_IDENTITY_SRC: 7506 case SADB_EXT_IDENTITY_DST: 7507 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7508 SADB_X_IDENTTYPE_ADDR) { 7509 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7510 checktype = ADDR; 7511 } else 7512 checktype = NONE; 7513 break; 7514 default: 7515 checktype = NONE; 7516 break; 7517 } 7518 7519 switch (checktype) { 7520 case NONE: 7521 break; 7522 case ADDR: 7523 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7524 if (len < baselen + sal) 7525 return EINVAL; 7526 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7527 return EINVAL; 7528 break; 7529 } 7530 7531 return 0; 7532 } 7533 7534 static int 7535 key_do_init(void) 7536 { 7537 int i, error; 7538 7539 mutex_init(&key_mtx, MUTEX_DEFAULT, IPL_NONE); 7540 7541 pfkeystat_percpu = percpu_alloc(sizeof(uint64_t) * PFKEY_NSTATS); 7542 7543 callout_init(&key_timehandler_ch, 0); 7544 error = workqueue_create(&key_timehandler_wq, "key_timehandler", 7545 key_timehandler_work, NULL, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 7546 if (error != 0) 7547 panic("%s: workqueue_create failed (%d)\n", __func__, error); 7548 7549 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7550 PSLIST_INIT(&sptree[i]); 7551 } 7552 7553 LIST_INIT(&sahtree); 7554 7555 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7556 LIST_INIT(®tree[i]); 7557 } 7558 7559 #ifndef IPSEC_NONBLOCK_ACQUIRE 7560 LIST_INIT(&acqtree); 7561 #endif 7562 #ifdef notyet 7563 LIST_INIT(&spacqtree); 7564 #endif 7565 7566 /* system default */ 7567 ip4_def_policy.policy = IPSEC_POLICY_NONE; 7568 ip4_def_policy.refcnt++; /*never reclaim this*/ 7569 7570 #ifdef INET6 7571 ip6_def_policy.policy = IPSEC_POLICY_NONE; 7572 ip6_def_policy.refcnt++; /*never reclaim this*/ 7573 #endif 7574 7575 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); 7576 7577 /* initialize key statistics */ 7578 keystat.getspi_count = 1; 7579 7580 aprint_verbose("IPsec: Initialized Security Association Processing.\n"); 7581 7582 return (0); 7583 } 7584 7585 void 7586 key_init(void) 7587 { 7588 static ONCE_DECL(key_init_once); 7589 7590 sysctl_net_keyv2_setup(NULL); 7591 sysctl_net_key_compat_setup(NULL); 7592 7593 RUN_ONCE(&key_init_once, key_do_init); 7594 } 7595 7596 /* 7597 * XXX: maybe This function is called after INBOUND IPsec processing. 7598 * 7599 * Special check for tunnel-mode packets. 7600 * We must make some checks for consistency between inner and outer IP header. 7601 * 7602 * xxx more checks to be provided 7603 */ 7604 int 7605 key_checktunnelsanity( 7606 struct secasvar *sav, 7607 u_int family, 7608 void *src, 7609 void *dst 7610 ) 7611 { 7612 7613 /* XXX: check inner IP header */ 7614 7615 return 1; 7616 } 7617 7618 #if 0 7619 #define hostnamelen strlen(hostname) 7620 7621 /* 7622 * Get FQDN for the host. 7623 * If the administrator configured hostname (by hostname(1)) without 7624 * domain name, returns nothing. 7625 */ 7626 static const char * 7627 key_getfqdn(void) 7628 { 7629 int i; 7630 int hasdot; 7631 static char fqdn[MAXHOSTNAMELEN + 1]; 7632 7633 if (!hostnamelen) 7634 return NULL; 7635 7636 /* check if it comes with domain name. */ 7637 hasdot = 0; 7638 for (i = 0; i < hostnamelen; i++) { 7639 if (hostname[i] == '.') 7640 hasdot++; 7641 } 7642 if (!hasdot) 7643 return NULL; 7644 7645 /* NOTE: hostname may not be NUL-terminated. */ 7646 memset(fqdn, 0, sizeof(fqdn)); 7647 memcpy(fqdn, hostname, hostnamelen); 7648 fqdn[hostnamelen] = '\0'; 7649 return fqdn; 7650 } 7651 7652 /* 7653 * get username@FQDN for the host/user. 7654 */ 7655 static const char * 7656 key_getuserfqdn(void) 7657 { 7658 const char *host; 7659 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2]; 7660 struct proc *p = curproc; 7661 char *q; 7662 7663 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) 7664 return NULL; 7665 if (!(host = key_getfqdn())) 7666 return NULL; 7667 7668 /* NOTE: s_login may not be-NUL terminated. */ 7669 memset(userfqdn, 0, sizeof(userfqdn)); 7670 memcpy(userfqdn, Mp->p_pgrp->pg_session->s_login, AXLOGNAME); 7671 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */ 7672 q = userfqdn + strlen(userfqdn); 7673 *q++ = '@'; 7674 memcpy(q, host, strlen(host)); 7675 q += strlen(host); 7676 *q++ = '\0'; 7677 7678 return userfqdn; 7679 } 7680 #endif 7681 7682 /* record data transfer on SA, and update timestamps */ 7683 void 7684 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m) 7685 { 7686 7687 KASSERT(sav != NULL); 7688 KASSERT(sav->lft_c != NULL); 7689 KASSERT(m != NULL); 7690 7691 /* 7692 * XXX Currently, there is a difference of bytes size 7693 * between inbound and outbound processing. 7694 */ 7695 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len; 7696 /* to check bytes lifetime is done in key_timehandler(). */ 7697 7698 /* 7699 * We use the number of packets as the unit of 7700 * sadb_lifetime_allocations. We increment the variable 7701 * whenever {esp,ah}_{in,out}put is called. 7702 */ 7703 sav->lft_c->sadb_lifetime_allocations++; 7704 /* XXX check for expires? */ 7705 7706 /* 7707 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock, 7708 * in seconds. HARD and SOFT lifetime are measured by the time 7709 * difference (again in seconds) from sadb_lifetime_usetime. 7710 * 7711 * usetime 7712 * v expire expire 7713 * -----+-----+--------+---> t 7714 * <--------------> HARD 7715 * <-----> SOFT 7716 */ 7717 sav->lft_c->sadb_lifetime_usetime = time_uptime; 7718 /* XXX check for expires? */ 7719 7720 return; 7721 } 7722 7723 /* dumb version */ 7724 void 7725 key_sa_routechange(struct sockaddr *dst) 7726 { 7727 struct secashead *sah; 7728 struct route *ro; 7729 const struct sockaddr *sa; 7730 7731 LIST_FOREACH(sah, &sahtree, chain) { 7732 ro = &sah->sa_route; 7733 sa = rtcache_getdst(ro); 7734 if (sa != NULL && dst->sa_len == sa->sa_len && 7735 memcmp(dst, sa, dst->sa_len) == 0) 7736 rtcache_free(ro); 7737 } 7738 7739 return; 7740 } 7741 7742 static void 7743 key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7744 { 7745 struct secasvar *_sav; 7746 7747 KASSERT(sav != NULL); 7748 7749 if (sav->state == state) 7750 return; 7751 7752 KASSERT(__LIST_CHAINED(sav)); 7753 LIST_REMOVE(sav, chain); 7754 7755 sav->state = state; 7756 if (!SADB_SASTATE_USABLE_P(sav)) { 7757 /* We don't need to care about the order */ 7758 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7759 return; 7760 } 7761 /* 7762 * Sort the list by lft_c->sadb_lifetime_addtime 7763 * in ascending order. 7764 */ 7765 LIST_FOREACH(_sav, &sav->sah->savtree[state], chain) { 7766 if (_sav->lft_c->sadb_lifetime_addtime > 7767 sav->lft_c->sadb_lifetime_addtime) { 7768 LIST_INSERT_BEFORE(_sav, sav, chain); 7769 break; 7770 } 7771 } 7772 if (_sav == NULL) { 7773 LIST_INSERT_TAIL(&sav->sah->savtree[state], sav, secasvar, 7774 chain); 7775 } 7776 key_validate_savlist(sav->sah, state); 7777 } 7778 7779 /* XXX too much? */ 7780 static struct mbuf * 7781 key_alloc_mbuf(int l) 7782 { 7783 struct mbuf *m = NULL, *n; 7784 int len, t; 7785 7786 len = l; 7787 while (len > 0) { 7788 MGET(n, M_DONTWAIT, MT_DATA); 7789 if (n && len > MLEN) 7790 MCLGET(n, M_DONTWAIT); 7791 if (!n) { 7792 m_freem(m); 7793 return NULL; 7794 } 7795 7796 n->m_next = NULL; 7797 n->m_len = 0; 7798 n->m_len = M_TRAILINGSPACE(n); 7799 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7800 if (n->m_len > len) { 7801 t = (n->m_len - len) & ~(sizeof(long) - 1); 7802 n->m_data += t; 7803 n->m_len = len; 7804 } 7805 7806 len -= n->m_len; 7807 7808 if (m) 7809 m_cat(m, n); 7810 else 7811 m = n; 7812 } 7813 7814 return m; 7815 } 7816 7817 static struct mbuf * 7818 key_setdump(u_int8_t req_satype, int *errorp, uint32_t pid) 7819 { 7820 struct secashead *sah; 7821 struct secasvar *sav; 7822 u_int16_t proto; 7823 u_int8_t satype; 7824 u_int8_t state; 7825 int cnt; 7826 struct mbuf *m, *n; 7827 7828 /* map satype to proto */ 7829 proto = key_satype2proto(req_satype); 7830 if (proto == 0) { 7831 *errorp = EINVAL; 7832 return (NULL); 7833 } 7834 7835 /* count sav entries to be sent to the userland. */ 7836 cnt = 0; 7837 LIST_FOREACH(sah, &sahtree, chain) { 7838 if (req_satype != SADB_SATYPE_UNSPEC && 7839 proto != sah->saidx.proto) 7840 continue; 7841 7842 SASTATE_ANY_FOREACH(state) { 7843 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7844 cnt++; 7845 } 7846 } 7847 } 7848 7849 if (cnt == 0) { 7850 *errorp = ENOENT; 7851 return (NULL); 7852 } 7853 7854 /* send this to the userland, one at a time. */ 7855 m = NULL; 7856 LIST_FOREACH(sah, &sahtree, chain) { 7857 if (req_satype != SADB_SATYPE_UNSPEC && 7858 proto != sah->saidx.proto) 7859 continue; 7860 7861 /* map proto to satype */ 7862 satype = key_proto2satype(sah->saidx.proto); 7863 if (satype == 0) { 7864 m_freem(m); 7865 *errorp = EINVAL; 7866 return (NULL); 7867 } 7868 7869 SASTATE_ANY_FOREACH(state) { 7870 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7871 n = key_setdumpsa(sav, SADB_DUMP, satype, 7872 --cnt, pid); 7873 if (!n) { 7874 m_freem(m); 7875 *errorp = ENOBUFS; 7876 return (NULL); 7877 } 7878 7879 if (!m) 7880 m = n; 7881 else 7882 m_cat(m, n); 7883 } 7884 } 7885 } 7886 7887 if (!m) { 7888 *errorp = EINVAL; 7889 return (NULL); 7890 } 7891 7892 if ((m->m_flags & M_PKTHDR) != 0) { 7893 m->m_pkthdr.len = 0; 7894 for (n = m; n; n = n->m_next) 7895 m->m_pkthdr.len += n->m_len; 7896 } 7897 7898 *errorp = 0; 7899 return (m); 7900 } 7901 7902 static struct mbuf * 7903 key_setspddump(int *errorp, pid_t pid) 7904 { 7905 struct secpolicy *sp; 7906 int cnt; 7907 u_int dir; 7908 struct mbuf *m, *n; 7909 7910 /* search SPD entry and get buffer size. */ 7911 cnt = 0; 7912 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 7913 SPLIST_READER_FOREACH(sp, dir) { 7914 cnt++; 7915 } 7916 } 7917 7918 if (cnt == 0) { 7919 *errorp = ENOENT; 7920 return (NULL); 7921 } 7922 7923 m = NULL; 7924 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 7925 SPLIST_READER_FOREACH(sp, dir) { 7926 --cnt; 7927 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, pid); 7928 7929 if (!n) { 7930 *errorp = ENOBUFS; 7931 m_freem(m); 7932 return (NULL); 7933 } 7934 if (!m) 7935 m = n; 7936 else { 7937 m->m_pkthdr.len += n->m_pkthdr.len; 7938 m_cat(m, n); 7939 } 7940 } 7941 } 7942 7943 *errorp = 0; 7944 return (m); 7945 } 7946 7947 int 7948 key_get_used(void) { 7949 return !SPLIST_READER_EMPTY(IPSEC_DIR_INBOUND) || 7950 !SPLIST_READER_EMPTY(IPSEC_DIR_OUTBOUND); 7951 } 7952 7953 void 7954 key_update_used(void) 7955 { 7956 switch (ipsec_enabled) { 7957 default: 7958 case 0: 7959 #ifdef notyet 7960 /* XXX: racy */ 7961 ipsec_used = 0; 7962 #endif 7963 break; 7964 case 1: 7965 #ifndef notyet 7966 /* XXX: racy */ 7967 if (!ipsec_used) 7968 #endif 7969 ipsec_used = key_get_used(); 7970 break; 7971 case 2: 7972 ipsec_used = 1; 7973 break; 7974 } 7975 } 7976 7977 static int 7978 sysctl_net_key_dumpsa(SYSCTLFN_ARGS) 7979 { 7980 struct mbuf *m, *n; 7981 int err2 = 0; 7982 char *p, *ep; 7983 size_t len; 7984 int s, error; 7985 7986 if (newp) 7987 return (EPERM); 7988 if (namelen != 1) 7989 return (EINVAL); 7990 7991 s = splsoftnet(); 7992 m = key_setdump(name[0], &error, l->l_proc->p_pid); 7993 splx(s); 7994 if (!m) 7995 return (error); 7996 if (!oldp) 7997 *oldlenp = m->m_pkthdr.len; 7998 else { 7999 p = oldp; 8000 if (*oldlenp < m->m_pkthdr.len) { 8001 err2 = ENOMEM; 8002 ep = p + *oldlenp; 8003 } else { 8004 *oldlenp = m->m_pkthdr.len; 8005 ep = p + m->m_pkthdr.len; 8006 } 8007 for (n = m; n; n = n->m_next) { 8008 len = (ep - p < n->m_len) ? 8009 ep - p : n->m_len; 8010 error = copyout(mtod(n, const void *), p, len); 8011 p += len; 8012 if (error) 8013 break; 8014 } 8015 if (error == 0) 8016 error = err2; 8017 } 8018 m_freem(m); 8019 8020 return (error); 8021 } 8022 8023 static int 8024 sysctl_net_key_dumpsp(SYSCTLFN_ARGS) 8025 { 8026 struct mbuf *m, *n; 8027 int err2 = 0; 8028 char *p, *ep; 8029 size_t len; 8030 int s, error; 8031 8032 if (newp) 8033 return (EPERM); 8034 if (namelen != 0) 8035 return (EINVAL); 8036 8037 s = splsoftnet(); 8038 m = key_setspddump(&error, l->l_proc->p_pid); 8039 splx(s); 8040 if (!m) 8041 return (error); 8042 if (!oldp) 8043 *oldlenp = m->m_pkthdr.len; 8044 else { 8045 p = oldp; 8046 if (*oldlenp < m->m_pkthdr.len) { 8047 err2 = ENOMEM; 8048 ep = p + *oldlenp; 8049 } else { 8050 *oldlenp = m->m_pkthdr.len; 8051 ep = p + m->m_pkthdr.len; 8052 } 8053 for (n = m; n; n = n->m_next) { 8054 len = (ep - p < n->m_len) ? ep - p : n->m_len; 8055 error = copyout(mtod(n, const void *), p, len); 8056 p += len; 8057 if (error) 8058 break; 8059 } 8060 if (error == 0) 8061 error = err2; 8062 } 8063 m_freem(m); 8064 8065 return (error); 8066 } 8067 8068 /* 8069 * Create sysctl tree for native IPSEC key knobs, originally 8070 * under name "net.keyv2" * with MIB number { CTL_NET, PF_KEY_V2. }. 8071 * However, sysctl(8) never checked for nodes under { CTL_NET, PF_KEY_V2 }; 8072 * and in any case the part of our sysctl namespace used for dumping the 8073 * SPD and SA database *HAS* to be compatible with the KAME sysctl 8074 * namespace, for API reasons. 8075 * 8076 * Pending a consensus on the right way to fix this, add a level of 8077 * indirection in how we number the `native' IPSEC key nodes; 8078 * and (as requested by Andrew Brown) move registration of the 8079 * KAME-compatible names to a separate function. 8080 */ 8081 #if 0 8082 # define IPSEC_PFKEY PF_KEY_V2 8083 # define IPSEC_PFKEY_NAME "keyv2" 8084 #else 8085 # define IPSEC_PFKEY PF_KEY 8086 # define IPSEC_PFKEY_NAME "key" 8087 #endif 8088 8089 static int 8090 sysctl_net_key_stats(SYSCTLFN_ARGS) 8091 { 8092 8093 return (NETSTAT_SYSCTL(pfkeystat_percpu, PFKEY_NSTATS)); 8094 } 8095 8096 static void 8097 sysctl_net_keyv2_setup(struct sysctllog **clog) 8098 { 8099 8100 sysctl_createv(clog, 0, NULL, NULL, 8101 CTLFLAG_PERMANENT, 8102 CTLTYPE_NODE, IPSEC_PFKEY_NAME, NULL, 8103 NULL, 0, NULL, 0, 8104 CTL_NET, IPSEC_PFKEY, CTL_EOL); 8105 8106 sysctl_createv(clog, 0, NULL, NULL, 8107 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8108 CTLTYPE_INT, "debug", NULL, 8109 NULL, 0, &key_debug_level, 0, 8110 CTL_NET, IPSEC_PFKEY, KEYCTL_DEBUG_LEVEL, CTL_EOL); 8111 sysctl_createv(clog, 0, NULL, NULL, 8112 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8113 CTLTYPE_INT, "spi_try", NULL, 8114 NULL, 0, &key_spi_trycnt, 0, 8115 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_TRY, CTL_EOL); 8116 sysctl_createv(clog, 0, NULL, NULL, 8117 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8118 CTLTYPE_INT, "spi_min_value", NULL, 8119 NULL, 0, &key_spi_minval, 0, 8120 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_MIN_VALUE, CTL_EOL); 8121 sysctl_createv(clog, 0, NULL, NULL, 8122 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8123 CTLTYPE_INT, "spi_max_value", NULL, 8124 NULL, 0, &key_spi_maxval, 0, 8125 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_MAX_VALUE, CTL_EOL); 8126 sysctl_createv(clog, 0, NULL, NULL, 8127 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8128 CTLTYPE_INT, "random_int", NULL, 8129 NULL, 0, &key_int_random, 0, 8130 CTL_NET, IPSEC_PFKEY, KEYCTL_RANDOM_INT, CTL_EOL); 8131 sysctl_createv(clog, 0, NULL, NULL, 8132 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8133 CTLTYPE_INT, "larval_lifetime", NULL, 8134 NULL, 0, &key_larval_lifetime, 0, 8135 CTL_NET, IPSEC_PFKEY, KEYCTL_LARVAL_LIFETIME, CTL_EOL); 8136 sysctl_createv(clog, 0, NULL, NULL, 8137 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8138 CTLTYPE_INT, "blockacq_count", NULL, 8139 NULL, 0, &key_blockacq_count, 0, 8140 CTL_NET, IPSEC_PFKEY, KEYCTL_BLOCKACQ_COUNT, CTL_EOL); 8141 sysctl_createv(clog, 0, NULL, NULL, 8142 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8143 CTLTYPE_INT, "blockacq_lifetime", NULL, 8144 NULL, 0, &key_blockacq_lifetime, 0, 8145 CTL_NET, IPSEC_PFKEY, KEYCTL_BLOCKACQ_LIFETIME, CTL_EOL); 8146 sysctl_createv(clog, 0, NULL, NULL, 8147 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8148 CTLTYPE_INT, "esp_keymin", NULL, 8149 NULL, 0, &ipsec_esp_keymin, 0, 8150 CTL_NET, IPSEC_PFKEY, KEYCTL_ESP_KEYMIN, CTL_EOL); 8151 sysctl_createv(clog, 0, NULL, NULL, 8152 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8153 CTLTYPE_INT, "prefered_oldsa", NULL, 8154 NULL, 0, &key_prefered_oldsa, 0, 8155 CTL_NET, PF_KEY, KEYCTL_PREFERED_OLDSA, CTL_EOL); 8156 sysctl_createv(clog, 0, NULL, NULL, 8157 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8158 CTLTYPE_INT, "esp_auth", NULL, 8159 NULL, 0, &ipsec_esp_auth, 0, 8160 CTL_NET, IPSEC_PFKEY, KEYCTL_ESP_AUTH, CTL_EOL); 8161 sysctl_createv(clog, 0, NULL, NULL, 8162 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8163 CTLTYPE_INT, "ah_keymin", NULL, 8164 NULL, 0, &ipsec_ah_keymin, 0, 8165 CTL_NET, IPSEC_PFKEY, KEYCTL_AH_KEYMIN, CTL_EOL); 8166 sysctl_createv(clog, 0, NULL, NULL, 8167 CTLFLAG_PERMANENT, 8168 CTLTYPE_STRUCT, "stats", 8169 SYSCTL_DESCR("PF_KEY statistics"), 8170 sysctl_net_key_stats, 0, NULL, 0, 8171 CTL_NET, IPSEC_PFKEY, CTL_CREATE, CTL_EOL); 8172 } 8173 8174 /* 8175 * Register sysctl names used by setkey(8). For historical reasons, 8176 * and to share a single API, these names appear under { CTL_NET, PF_KEY } 8177 * for both IPSEC and KAME IPSEC. 8178 */ 8179 static void 8180 sysctl_net_key_compat_setup(struct sysctllog **clog) 8181 { 8182 8183 sysctl_createv(clog, 0, NULL, NULL, 8184 CTLFLAG_PERMANENT, 8185 CTLTYPE_NODE, "key", NULL, 8186 NULL, 0, NULL, 0, 8187 CTL_NET, PF_KEY, CTL_EOL); 8188 8189 /* Register the net.key.dump{sa,sp} nodes used by setkey(8). */ 8190 sysctl_createv(clog, 0, NULL, NULL, 8191 CTLFLAG_PERMANENT, 8192 CTLTYPE_STRUCT, "dumpsa", NULL, 8193 sysctl_net_key_dumpsa, 0, NULL, 0, 8194 CTL_NET, PF_KEY, KEYCTL_DUMPSA, CTL_EOL); 8195 sysctl_createv(clog, 0, NULL, NULL, 8196 CTLFLAG_PERMANENT, 8197 CTLTYPE_STRUCT, "dumpsp", NULL, 8198 sysctl_net_key_dumpsp, 0, NULL, 0, 8199 CTL_NET, PF_KEY, KEYCTL_DUMPSP, CTL_EOL); 8200 } 8201
Indexes created Mon Sep 22 13:09:51 GMT 2025