key.c revision 1.194
1 /* $NetBSD: key.c,v 1.194 2017/07/26 09:18:15 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 1.194 2017/07/26 09:18:15 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 int s; 4544 time_t now = time_uptime; 4545 4546 s = splsoftnet(); 4547 mutex_enter(softnet_lock); 4548 4549 key_timehandler_spd(now); 4550 key_timehandler_sad(now); 4551 key_timehandler_acq(now); 4552 key_timehandler_spacq(now); 4553 4554 /* do exchange to tick time !! */ 4555 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); 4556 4557 mutex_exit(softnet_lock); 4558 splx(s); 4559 return; 4560 } 4561 4562 static void 4563 key_timehandler(void *arg) 4564 { 4565 4566 workqueue_enqueue(key_timehandler_wq, &key_timehandler_wk, NULL); 4567 } 4568 4569 u_long 4570 key_random(void) 4571 { 4572 u_long value; 4573 4574 key_randomfill(&value, sizeof(value)); 4575 return value; 4576 } 4577 4578 void 4579 key_randomfill(void *p, size_t l) 4580 { 4581 4582 cprng_fast(p, l); 4583 } 4584 4585 /* 4586 * map SADB_SATYPE_* to IPPROTO_*. 4587 * if satype == SADB_SATYPE then satype is mapped to ~0. 4588 * OUT: 4589 * 0: invalid satype. 4590 */ 4591 static u_int16_t 4592 key_satype2proto(u_int8_t satype) 4593 { 4594 switch (satype) { 4595 case SADB_SATYPE_UNSPEC: 4596 return IPSEC_PROTO_ANY; 4597 case SADB_SATYPE_AH: 4598 return IPPROTO_AH; 4599 case SADB_SATYPE_ESP: 4600 return IPPROTO_ESP; 4601 case SADB_X_SATYPE_IPCOMP: 4602 return IPPROTO_IPCOMP; 4603 case SADB_X_SATYPE_TCPSIGNATURE: 4604 return IPPROTO_TCP; 4605 default: 4606 return 0; 4607 } 4608 /* NOTREACHED */ 4609 } 4610 4611 /* 4612 * map IPPROTO_* to SADB_SATYPE_* 4613 * OUT: 4614 * 0: invalid protocol type. 4615 */ 4616 static u_int8_t 4617 key_proto2satype(u_int16_t proto) 4618 { 4619 switch (proto) { 4620 case IPPROTO_AH: 4621 return SADB_SATYPE_AH; 4622 case IPPROTO_ESP: 4623 return SADB_SATYPE_ESP; 4624 case IPPROTO_IPCOMP: 4625 return SADB_X_SATYPE_IPCOMP; 4626 case IPPROTO_TCP: 4627 return SADB_X_SATYPE_TCPSIGNATURE; 4628 default: 4629 return 0; 4630 } 4631 /* NOTREACHED */ 4632 } 4633 4634 static int 4635 key_setsecasidx(int proto, int mode, int reqid, 4636 const struct sockaddr *src, const struct sockaddr *dst, 4637 struct secasindex * saidx) 4638 { 4639 const union sockaddr_union *src_u = (const union sockaddr_union *)src; 4640 const union sockaddr_union *dst_u = (const union sockaddr_union *)dst; 4641 4642 /* sa len safety check */ 4643 if (key_checksalen(src_u) != 0) 4644 return -1; 4645 if (key_checksalen(dst_u) != 0) 4646 return -1; 4647 4648 memset(saidx, 0, sizeof(*saidx)); 4649 saidx->proto = proto; 4650 saidx->mode = mode; 4651 saidx->reqid = reqid; 4652 memcpy(&saidx->src, src_u, src_u->sa.sa_len); 4653 memcpy(&saidx->dst, dst_u, dst_u->sa.sa_len); 4654 4655 key_porttosaddr(&((saidx)->src), 0); 4656 key_porttosaddr(&((saidx)->dst), 0); 4657 return 0; 4658 } 4659 4660 static void 4661 key_init_spidx_bymsghdr(struct secpolicyindex *spidx, 4662 const struct sadb_msghdr *mhp) 4663 { 4664 const struct sadb_address *src0, *dst0; 4665 const struct sockaddr *src, *dst; 4666 const struct sadb_x_policy *xpl0; 4667 4668 src0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_SRC]; 4669 dst0 = (struct sadb_address *)mhp->ext[SADB_EXT_ADDRESS_DST]; 4670 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 4671 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 4672 xpl0 = (struct sadb_x_policy *)mhp->ext[SADB_X_EXT_POLICY]; 4673 4674 memset(spidx, 0, sizeof(*spidx)); 4675 spidx->dir = xpl0->sadb_x_policy_dir; 4676 spidx->prefs = src0->sadb_address_prefixlen; 4677 spidx->prefd = dst0->sadb_address_prefixlen; 4678 spidx->ul_proto = src0->sadb_address_proto; 4679 /* XXX boundary check against sa_len */ 4680 memcpy(&spidx->src, src, src->sa_len); 4681 memcpy(&spidx->dst, dst, dst->sa_len); 4682 } 4683 4684 /* %%% PF_KEY */ 4685 /* 4686 * SADB_GETSPI processing is to receive 4687 * <base, (SA2), src address, dst address, (SPI range)> 4688 * from the IKMPd, to assign a unique spi value, to hang on the INBOUND 4689 * tree with the status of LARVAL, and send 4690 * <base, SA(*), address(SD)> 4691 * to the IKMPd. 4692 * 4693 * IN: mhp: pointer to the pointer to each header. 4694 * OUT: NULL if fail. 4695 * other if success, return pointer to the message to send. 4696 */ 4697 static int 4698 key_api_getspi(struct socket *so, struct mbuf *m, 4699 const struct sadb_msghdr *mhp) 4700 { 4701 const struct sockaddr *src, *dst; 4702 struct secasindex saidx; 4703 struct secashead *newsah; 4704 struct secasvar *newsav; 4705 u_int8_t proto; 4706 u_int32_t spi; 4707 u_int8_t mode; 4708 u_int16_t reqid; 4709 int error; 4710 4711 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 4712 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 4713 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 4714 return key_senderror(so, m, EINVAL); 4715 } 4716 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 4717 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 4718 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 4719 return key_senderror(so, m, EINVAL); 4720 } 4721 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 4722 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 4723 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 4724 } else { 4725 mode = IPSEC_MODE_ANY; 4726 reqid = 0; 4727 } 4728 4729 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 4730 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 4731 4732 /* map satype to proto */ 4733 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 4734 if (proto == 0) { 4735 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 4736 return key_senderror(so, m, EINVAL); 4737 } 4738 4739 4740 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 4741 if (error != 0) 4742 return key_senderror(so, m, EINVAL); 4743 4744 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 4745 if (error != 0) 4746 return key_senderror(so, m, EINVAL); 4747 4748 /* SPI allocation */ 4749 spi = key_do_getnewspi((struct sadb_spirange *)mhp->ext[SADB_EXT_SPIRANGE], 4750 &saidx); 4751 if (spi == 0) 4752 return key_senderror(so, m, EINVAL); 4753 4754 /* get a SA index */ 4755 newsah = key_getsah(&saidx, CMP_REQID); 4756 if (newsah == NULL) { 4757 /* create a new SA index */ 4758 newsah = key_newsah(&saidx); 4759 if (newsah == NULL) { 4760 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 4761 return key_senderror(so, m, ENOBUFS); 4762 } 4763 } 4764 4765 /* get a new SA */ 4766 /* XXX rewrite */ 4767 newsav = KEY_NEWSAV(m, mhp, &error); 4768 if (newsav == NULL) { 4769 /* XXX don't free new SA index allocated in above. */ 4770 return key_senderror(so, m, error); 4771 } 4772 4773 /* set spi */ 4774 newsav->spi = htonl(spi); 4775 4776 /* add to satree */ 4777 newsav->refcnt = 1; 4778 newsav->sah = newsah; 4779 newsav->state = SADB_SASTATE_LARVAL; 4780 LIST_INSERT_TAIL(&newsah->savtree[SADB_SASTATE_LARVAL], newsav, 4781 secasvar, chain); 4782 key_validate_savlist(newsah, SADB_SASTATE_LARVAL); 4783 4784 #ifndef IPSEC_NONBLOCK_ACQUIRE 4785 /* delete the entry in acqtree */ 4786 if (mhp->msg->sadb_msg_seq != 0) { 4787 struct secacq *acq; 4788 mutex_enter(&key_mtx); 4789 acq = key_getacqbyseq(mhp->msg->sadb_msg_seq); 4790 if (acq != NULL) { 4791 /* reset counter in order to deletion by timehandler. */ 4792 acq->created = time_uptime; 4793 acq->count = 0; 4794 } 4795 mutex_exit(&key_mtx); 4796 } 4797 #endif 4798 4799 { 4800 struct mbuf *n, *nn; 4801 struct sadb_sa *m_sa; 4802 int off, len; 4803 4804 CTASSERT(PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4805 PFKEY_ALIGN8(sizeof(struct sadb_sa)) <= MCLBYTES); 4806 4807 /* create new sadb_msg to reply. */ 4808 len = PFKEY_ALIGN8(sizeof(struct sadb_msg)) + 4809 PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4810 4811 MGETHDR(n, M_DONTWAIT, MT_DATA); 4812 if (len > MHLEN) { 4813 MCLGET(n, M_DONTWAIT); 4814 if ((n->m_flags & M_EXT) == 0) { 4815 m_freem(n); 4816 n = NULL; 4817 } 4818 } 4819 if (!n) 4820 return key_senderror(so, m, ENOBUFS); 4821 4822 n->m_len = len; 4823 n->m_next = NULL; 4824 off = 0; 4825 4826 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); 4827 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 4828 4829 m_sa = (struct sadb_sa *)(mtod(n, char *) + off); 4830 m_sa->sadb_sa_len = PFKEY_UNIT64(sizeof(struct sadb_sa)); 4831 m_sa->sadb_sa_exttype = SADB_EXT_SA; 4832 m_sa->sadb_sa_spi = htonl(spi); 4833 off += PFKEY_ALIGN8(sizeof(struct sadb_sa)); 4834 4835 KASSERTMSG(off == len, "length inconsistency"); 4836 4837 n->m_next = key_gather_mbuf(m, mhp, 0, 2, SADB_EXT_ADDRESS_SRC, 4838 SADB_EXT_ADDRESS_DST); 4839 if (!n->m_next) { 4840 m_freem(n); 4841 return key_senderror(so, m, ENOBUFS); 4842 } 4843 4844 if (n->m_len < sizeof(struct sadb_msg)) { 4845 n = m_pullup(n, sizeof(struct sadb_msg)); 4846 if (n == NULL) 4847 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 4848 } 4849 4850 n->m_pkthdr.len = 0; 4851 for (nn = n; nn; nn = nn->m_next) 4852 n->m_pkthdr.len += nn->m_len; 4853 4854 key_fill_replymsg(n, newsav->seq); 4855 4856 m_freem(m); 4857 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 4858 } 4859 } 4860 4861 /* 4862 * allocating new SPI 4863 * called by key_api_getspi(). 4864 * OUT: 4865 * 0: failure. 4866 * others: success. 4867 */ 4868 static u_int32_t 4869 key_do_getnewspi(const struct sadb_spirange *spirange, 4870 const struct secasindex *saidx) 4871 { 4872 u_int32_t newspi; 4873 u_int32_t spmin, spmax; 4874 int count = key_spi_trycnt; 4875 4876 /* set spi range to allocate */ 4877 if (spirange != NULL) { 4878 spmin = spirange->sadb_spirange_min; 4879 spmax = spirange->sadb_spirange_max; 4880 } else { 4881 spmin = key_spi_minval; 4882 spmax = key_spi_maxval; 4883 } 4884 /* IPCOMP needs 2-byte SPI */ 4885 if (saidx->proto == IPPROTO_IPCOMP) { 4886 u_int32_t t; 4887 if (spmin >= 0x10000) 4888 spmin = 0xffff; 4889 if (spmax >= 0x10000) 4890 spmax = 0xffff; 4891 if (spmin > spmax) { 4892 t = spmin; spmin = spmax; spmax = t; 4893 } 4894 } 4895 4896 if (spmin == spmax) { 4897 if (key_checkspidup(saidx, htonl(spmin))) { 4898 IPSECLOG(LOG_DEBUG, "SPI %u exists already.\n", spmin); 4899 return 0; 4900 } 4901 4902 count--; /* taking one cost. */ 4903 newspi = spmin; 4904 4905 } else { 4906 4907 /* init SPI */ 4908 newspi = 0; 4909 4910 /* when requesting to allocate spi ranged */ 4911 while (count--) { 4912 /* generate pseudo-random SPI value ranged. */ 4913 newspi = spmin + (key_random() % (spmax - spmin + 1)); 4914 4915 if (!key_checkspidup(saidx, htonl(newspi))) 4916 break; 4917 } 4918 4919 if (count == 0 || newspi == 0) { 4920 IPSECLOG(LOG_DEBUG, "to allocate spi is failed.\n"); 4921 return 0; 4922 } 4923 } 4924 4925 /* statistics */ 4926 keystat.getspi_count = 4927 (keystat.getspi_count + key_spi_trycnt - count) / 2; 4928 4929 return newspi; 4930 } 4931 4932 static int 4933 key_handle_natt_info(struct secasvar *sav, 4934 const struct sadb_msghdr *mhp) 4935 { 4936 const char *msg = "?" ; 4937 struct sadb_x_nat_t_type *type; 4938 struct sadb_x_nat_t_port *sport, *dport; 4939 struct sadb_address *iaddr, *raddr; 4940 struct sadb_x_nat_t_frag *frag; 4941 4942 if (mhp->ext[SADB_X_EXT_NAT_T_TYPE] == NULL || 4943 mhp->ext[SADB_X_EXT_NAT_T_SPORT] == NULL || 4944 mhp->ext[SADB_X_EXT_NAT_T_DPORT] == NULL) 4945 return 0; 4946 4947 if (mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) { 4948 msg = "TYPE"; 4949 goto bad; 4950 } 4951 4952 if (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) { 4953 msg = "SPORT"; 4954 goto bad; 4955 } 4956 4957 if (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport)) { 4958 msg = "DPORT"; 4959 goto bad; 4960 } 4961 4962 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) { 4963 IPSECLOG(LOG_DEBUG, "NAT-T OAi present\n"); 4964 if (mhp->extlen[SADB_X_EXT_NAT_T_OAI] < sizeof(*iaddr)) { 4965 msg = "OAI"; 4966 goto bad; 4967 } 4968 } 4969 4970 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) { 4971 IPSECLOG(LOG_DEBUG, "NAT-T OAr present\n"); 4972 if (mhp->extlen[SADB_X_EXT_NAT_T_OAR] < sizeof(*raddr)) { 4973 msg = "OAR"; 4974 goto bad; 4975 } 4976 } 4977 4978 if (mhp->ext[SADB_X_EXT_NAT_T_FRAG] != NULL) { 4979 if (mhp->extlen[SADB_X_EXT_NAT_T_FRAG] < sizeof(*frag)) { 4980 msg = "FRAG"; 4981 goto bad; 4982 } 4983 } 4984 4985 type = (struct sadb_x_nat_t_type *)mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 4986 sport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 4987 dport = (struct sadb_x_nat_t_port *)mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 4988 iaddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAI]; 4989 raddr = (struct sadb_address *)mhp->ext[SADB_X_EXT_NAT_T_OAR]; 4990 frag = (struct sadb_x_nat_t_frag *)mhp->ext[SADB_X_EXT_NAT_T_FRAG]; 4991 4992 IPSECLOG(LOG_DEBUG, "type %d, sport = %d, dport = %d\n", 4993 type->sadb_x_nat_t_type_type, 4994 ntohs(sport->sadb_x_nat_t_port_port), 4995 ntohs(dport->sadb_x_nat_t_port_port)); 4996 4997 sav->natt_type = type->sadb_x_nat_t_type_type; 4998 key_porttosaddr(&sav->sah->saidx.src, sport->sadb_x_nat_t_port_port); 4999 key_porttosaddr(&sav->sah->saidx.dst, dport->sadb_x_nat_t_port_port); 5000 if (frag) 5001 sav->esp_frag = frag->sadb_x_nat_t_frag_fraglen; 5002 else 5003 sav->esp_frag = IP_MAXPACKET; 5004 5005 return 0; 5006 bad: 5007 IPSECLOG(LOG_DEBUG, "invalid message %s\n", msg); 5008 __USE(msg); 5009 return -1; 5010 } 5011 5012 /* Just update the IPSEC_NAT_T ports if present */ 5013 static int 5014 key_set_natt_ports(union sockaddr_union *src, union sockaddr_union *dst, 5015 const struct sadb_msghdr *mhp) 5016 { 5017 if (mhp->ext[SADB_X_EXT_NAT_T_OAI] != NULL) 5018 IPSECLOG(LOG_DEBUG, "NAT-T OAi present\n"); 5019 if (mhp->ext[SADB_X_EXT_NAT_T_OAR] != NULL) 5020 IPSECLOG(LOG_DEBUG, "NAT-T OAr present\n"); 5021 5022 if ((mhp->ext[SADB_X_EXT_NAT_T_TYPE] != NULL) && 5023 (mhp->ext[SADB_X_EXT_NAT_T_SPORT] != NULL) && 5024 (mhp->ext[SADB_X_EXT_NAT_T_DPORT] != NULL)) { 5025 struct sadb_x_nat_t_type *type; 5026 struct sadb_x_nat_t_port *sport; 5027 struct sadb_x_nat_t_port *dport; 5028 5029 if ((mhp->extlen[SADB_X_EXT_NAT_T_TYPE] < sizeof(*type)) || 5030 (mhp->extlen[SADB_X_EXT_NAT_T_SPORT] < sizeof(*sport)) || 5031 (mhp->extlen[SADB_X_EXT_NAT_T_DPORT] < sizeof(*dport))) { 5032 IPSECLOG(LOG_DEBUG, "invalid message\n"); 5033 return -1; 5034 } 5035 5036 type = (struct sadb_x_nat_t_type *) 5037 mhp->ext[SADB_X_EXT_NAT_T_TYPE]; 5038 sport = (struct sadb_x_nat_t_port *) 5039 mhp->ext[SADB_X_EXT_NAT_T_SPORT]; 5040 dport = (struct sadb_x_nat_t_port *) 5041 mhp->ext[SADB_X_EXT_NAT_T_DPORT]; 5042 5043 key_porttosaddr(src, sport->sadb_x_nat_t_port_port); 5044 key_porttosaddr(dst, dport->sadb_x_nat_t_port_port); 5045 5046 IPSECLOG(LOG_DEBUG, "type %d, sport = %d, dport = %d\n", 5047 type->sadb_x_nat_t_type_type, 5048 ntohs(sport->sadb_x_nat_t_port_port), 5049 ntohs(dport->sadb_x_nat_t_port_port)); 5050 } 5051 5052 return 0; 5053 } 5054 5055 5056 /* 5057 * SADB_UPDATE processing 5058 * receive 5059 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5060 * key(AE), (identity(SD),) (sensitivity)> 5061 * from the ikmpd, and update a secasvar entry whose status is SADB_SASTATE_LARVAL. 5062 * and send 5063 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5064 * (identity(SD),) (sensitivity)> 5065 * to the ikmpd. 5066 * 5067 * m will always be freed. 5068 */ 5069 static int 5070 key_api_update(struct socket *so, struct mbuf *m, const struct sadb_msghdr *mhp) 5071 { 5072 struct sadb_sa *sa0; 5073 const struct sockaddr *src, *dst; 5074 struct secasindex saidx; 5075 struct secashead *sah; 5076 struct secasvar *sav, *newsav; 5077 u_int16_t proto; 5078 u_int8_t mode; 5079 u_int16_t reqid; 5080 int error; 5081 5082 /* map satype to proto */ 5083 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5084 if (proto == 0) { 5085 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5086 return key_senderror(so, m, EINVAL); 5087 } 5088 5089 if (mhp->ext[SADB_EXT_SA] == NULL || 5090 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5091 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5092 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5093 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5094 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5095 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5096 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5097 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5098 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5099 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5100 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5101 return key_senderror(so, m, EINVAL); 5102 } 5103 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5104 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5105 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5106 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5107 return key_senderror(so, m, EINVAL); 5108 } 5109 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5110 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5111 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5112 } else { 5113 mode = IPSEC_MODE_ANY; 5114 reqid = 0; 5115 } 5116 /* XXX boundary checking for other extensions */ 5117 5118 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5119 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5120 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5121 5122 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 5123 if (error != 0) 5124 return key_senderror(so, m, EINVAL); 5125 5126 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5127 if (error != 0) 5128 return key_senderror(so, m, EINVAL); 5129 5130 /* get a SA header */ 5131 sah = key_getsah(&saidx, CMP_REQID); 5132 if (sah == NULL) { 5133 IPSECLOG(LOG_DEBUG, "no SA index found.\n"); 5134 return key_senderror(so, m, ENOENT); 5135 } 5136 5137 /* set spidx if there */ 5138 /* XXX rewrite */ 5139 error = key_setident(sah, m, mhp); 5140 if (error) 5141 return key_senderror(so, m, error); 5142 5143 /* find a SA with sequence number. */ 5144 #ifdef IPSEC_DOSEQCHECK 5145 if (mhp->msg->sadb_msg_seq != 0) { 5146 sav = key_getsavbyseq(sah, mhp->msg->sadb_msg_seq); 5147 if (sav == NULL) { 5148 IPSECLOG(LOG_DEBUG, 5149 "no larval SA with sequence %u exists.\n", 5150 mhp->msg->sadb_msg_seq); 5151 return key_senderror(so, m, ENOENT); 5152 } 5153 } 5154 #else 5155 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5156 if (sav == NULL) { 5157 IPSECLOG(LOG_DEBUG, "no such a SA found (spi:%u)\n", 5158 (u_int32_t)ntohl(sa0->sadb_sa_spi)); 5159 return key_senderror(so, m, EINVAL); 5160 } 5161 #endif 5162 5163 /* validity check */ 5164 if (sav->sah->saidx.proto != proto) { 5165 IPSECLOG(LOG_DEBUG, "protocol mismatched (DB=%u param=%u)\n", 5166 sav->sah->saidx.proto, proto); 5167 error = EINVAL; 5168 goto error; 5169 } 5170 #ifdef IPSEC_DOSEQCHECK 5171 if (sav->spi != sa0->sadb_sa_spi) { 5172 IPSECLOG(LOG_DEBUG, "SPI mismatched (DB:%u param:%u)\n", 5173 (u_int32_t)ntohl(sav->spi), 5174 (u_int32_t)ntohl(sa0->sadb_sa_spi)); 5175 error = EINVAL; 5176 goto error; 5177 } 5178 #endif 5179 if (sav->pid != mhp->msg->sadb_msg_pid) { 5180 IPSECLOG(LOG_DEBUG, "pid mismatched (DB:%u param:%u)\n", 5181 sav->pid, mhp->msg->sadb_msg_pid); 5182 error = EINVAL; 5183 goto error; 5184 } 5185 5186 /* 5187 * Allocate a new SA instead of modifying the existing SA directly 5188 * to avoid race conditions. 5189 */ 5190 newsav = kmem_zalloc(sizeof(struct secasvar), KM_SLEEP); 5191 5192 /* copy sav values */ 5193 newsav->spi = sav->spi; 5194 newsav->seq = sav->seq; 5195 newsav->created = sav->created; 5196 newsav->pid = sav->pid; 5197 newsav->sah = sav->sah; 5198 5199 error = key_setsaval(newsav, m, mhp); 5200 if (error) { 5201 key_delsav(newsav); 5202 goto error; 5203 } 5204 5205 error = key_handle_natt_info(newsav, mhp); 5206 if (error != 0) { 5207 key_delsav(newsav); 5208 goto error; 5209 } 5210 5211 error = key_init_xform(newsav); 5212 if (error != 0) { 5213 key_delsav(newsav); 5214 goto error; 5215 } 5216 5217 /* add to satree */ 5218 newsav->refcnt = 1; 5219 newsav->state = SADB_SASTATE_MATURE; 5220 LIST_INSERT_TAIL(&sah->savtree[SADB_SASTATE_MATURE], newsav, 5221 secasvar, chain); 5222 key_validate_savlist(sah, SADB_SASTATE_MATURE); 5223 5224 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5225 KEY_FREESAV(&sav); 5226 KEY_FREESAV(&sav); 5227 5228 { 5229 struct mbuf *n; 5230 5231 /* set msg buf from mhp */ 5232 n = key_getmsgbuf_x1(m, mhp); 5233 if (n == NULL) { 5234 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5235 return key_senderror(so, m, ENOBUFS); 5236 } 5237 5238 m_freem(m); 5239 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5240 } 5241 error: 5242 KEY_FREESAV(&sav); 5243 return key_senderror(so, m, error); 5244 } 5245 5246 /* 5247 * search SAD with sequence for a SA which state is SADB_SASTATE_LARVAL. 5248 * only called by key_api_update(). 5249 * OUT: 5250 * NULL : not found 5251 * others : found, pointer to a SA. 5252 */ 5253 #ifdef IPSEC_DOSEQCHECK 5254 static struct secasvar * 5255 key_getsavbyseq(struct secashead *sah, u_int32_t seq) 5256 { 5257 struct secasvar *sav; 5258 u_int state; 5259 5260 state = SADB_SASTATE_LARVAL; 5261 5262 /* search SAD with sequence number ? */ 5263 LIST_FOREACH(sav, &sah->savtree[state], chain) { 5264 5265 KEY_CHKSASTATE(state, sav->state); 5266 5267 if (sav->seq == seq) { 5268 SA_ADDREF(sav); 5269 KEYDEBUG_PRINTF(KEYDEBUG_IPSEC_STAMP, 5270 "DP cause refcnt++:%d SA:%p\n", 5271 sav->refcnt, sav); 5272 return sav; 5273 } 5274 } 5275 5276 return NULL; 5277 } 5278 #endif 5279 5280 /* 5281 * SADB_ADD processing 5282 * add an entry to SA database, when received 5283 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5284 * key(AE), (identity(SD),) (sensitivity)> 5285 * from the ikmpd, 5286 * and send 5287 * <base, SA, (SA2), (lifetime(HSC),) address(SD), (address(P),) 5288 * (identity(SD),) (sensitivity)> 5289 * to the ikmpd. 5290 * 5291 * IGNORE identity and sensitivity messages. 5292 * 5293 * m will always be freed. 5294 */ 5295 static int 5296 key_api_add(struct socket *so, struct mbuf *m, 5297 const struct sadb_msghdr *mhp) 5298 { 5299 struct sadb_sa *sa0; 5300 const struct sockaddr *src, *dst; 5301 struct secasindex saidx; 5302 struct secashead *newsah; 5303 struct secasvar *newsav; 5304 u_int16_t proto; 5305 u_int8_t mode; 5306 u_int16_t reqid; 5307 int error; 5308 5309 /* map satype to proto */ 5310 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5311 if (proto == 0) { 5312 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5313 return key_senderror(so, m, EINVAL); 5314 } 5315 5316 if (mhp->ext[SADB_EXT_SA] == NULL || 5317 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5318 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 5319 (mhp->msg->sadb_msg_satype == SADB_SATYPE_ESP && 5320 mhp->ext[SADB_EXT_KEY_ENCRYPT] == NULL) || 5321 (mhp->msg->sadb_msg_satype == SADB_SATYPE_AH && 5322 mhp->ext[SADB_EXT_KEY_AUTH] == NULL) || 5323 (mhp->ext[SADB_EXT_LIFETIME_HARD] != NULL && 5324 mhp->ext[SADB_EXT_LIFETIME_SOFT] == NULL) || 5325 (mhp->ext[SADB_EXT_LIFETIME_HARD] == NULL && 5326 mhp->ext[SADB_EXT_LIFETIME_SOFT] != NULL)) { 5327 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5328 return key_senderror(so, m, EINVAL); 5329 } 5330 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5331 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5332 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5333 /* XXX need more */ 5334 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5335 return key_senderror(so, m, EINVAL); 5336 } 5337 if (mhp->ext[SADB_X_EXT_SA2] != NULL) { 5338 mode = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_mode; 5339 reqid = ((struct sadb_x_sa2 *)mhp->ext[SADB_X_EXT_SA2])->sadb_x_sa2_reqid; 5340 } else { 5341 mode = IPSEC_MODE_ANY; 5342 reqid = 0; 5343 } 5344 5345 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5346 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5347 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5348 5349 error = key_setsecasidx(proto, mode, reqid, src, dst, &saidx); 5350 if (error != 0) 5351 return key_senderror(so, m, EINVAL); 5352 5353 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5354 if (error != 0) 5355 return key_senderror(so, m, EINVAL); 5356 5357 /* get a SA header */ 5358 newsah = key_getsah(&saidx, CMP_REQID); 5359 if (newsah == NULL) { 5360 /* create a new SA header */ 5361 newsah = key_newsah(&saidx); 5362 if (newsah == NULL) { 5363 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5364 return key_senderror(so, m, ENOBUFS); 5365 } 5366 } 5367 5368 /* set spidx if there */ 5369 /* XXX rewrite */ 5370 error = key_setident(newsah, m, mhp); 5371 if (error) { 5372 return key_senderror(so, m, error); 5373 } 5374 5375 { 5376 struct secasvar *sav; 5377 5378 /* We can create new SA only if SPI is differenct. */ 5379 sav = key_getsavbyspi(newsah, sa0->sadb_sa_spi); 5380 if (sav != NULL) { 5381 KEY_FREESAV(&sav); 5382 IPSECLOG(LOG_DEBUG, "SA already exists.\n"); 5383 return key_senderror(so, m, EEXIST); 5384 } 5385 } 5386 5387 /* create new SA entry. */ 5388 newsav = KEY_NEWSAV(m, mhp, &error); 5389 if (newsav == NULL) { 5390 return key_senderror(so, m, error); 5391 } 5392 newsav->sah = newsah; 5393 5394 error = key_handle_natt_info(newsav, mhp); 5395 if (error != 0) { 5396 key_delsav(newsav); 5397 return key_senderror(so, m, EINVAL); 5398 } 5399 5400 error = key_init_xform(newsav); 5401 if (error != 0) { 5402 key_delsav(newsav); 5403 return key_senderror(so, m, error); 5404 } 5405 5406 /* add to satree */ 5407 newsav->refcnt = 1; 5408 newsav->state = SADB_SASTATE_MATURE; 5409 LIST_INSERT_TAIL(&newsah->savtree[SADB_SASTATE_MATURE], newsav, 5410 secasvar, chain); 5411 key_validate_savlist(newsah, SADB_SASTATE_MATURE); 5412 5413 /* 5414 * don't call key_freesav() here, as we would like to keep the SA 5415 * in the database on success. 5416 */ 5417 5418 { 5419 struct mbuf *n; 5420 5421 /* set msg buf from mhp */ 5422 n = key_getmsgbuf_x1(m, mhp); 5423 if (n == NULL) { 5424 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 5425 return key_senderror(so, m, ENOBUFS); 5426 } 5427 5428 m_freem(m); 5429 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5430 } 5431 } 5432 5433 /* m is retained */ 5434 static int 5435 key_setident(struct secashead *sah, struct mbuf *m, 5436 const struct sadb_msghdr *mhp) 5437 { 5438 const struct sadb_ident *idsrc, *iddst; 5439 int idsrclen, iddstlen; 5440 5441 KASSERT(!cpu_softintr_p()); 5442 KASSERT(sah != NULL); 5443 KASSERT(m != NULL); 5444 KASSERT(mhp != NULL); 5445 KASSERT(mhp->msg != NULL); 5446 5447 /* 5448 * Can be called with an existing sah from key_api_update(). 5449 */ 5450 if (sah->idents != NULL) { 5451 kmem_free(sah->idents, sah->idents_len); 5452 sah->idents = NULL; 5453 sah->idents_len = 0; 5454 } 5455 if (sah->identd != NULL) { 5456 kmem_free(sah->identd, sah->identd_len); 5457 sah->identd = NULL; 5458 sah->identd_len = 0; 5459 } 5460 5461 /* don't make buffer if not there */ 5462 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL && 5463 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5464 sah->idents = NULL; 5465 sah->identd = NULL; 5466 return 0; 5467 } 5468 5469 if (mhp->ext[SADB_EXT_IDENTITY_SRC] == NULL || 5470 mhp->ext[SADB_EXT_IDENTITY_DST] == NULL) { 5471 IPSECLOG(LOG_DEBUG, "invalid identity.\n"); 5472 return EINVAL; 5473 } 5474 5475 idsrc = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_SRC]; 5476 iddst = (const struct sadb_ident *)mhp->ext[SADB_EXT_IDENTITY_DST]; 5477 idsrclen = mhp->extlen[SADB_EXT_IDENTITY_SRC]; 5478 iddstlen = mhp->extlen[SADB_EXT_IDENTITY_DST]; 5479 5480 /* validity check */ 5481 if (idsrc->sadb_ident_type != iddst->sadb_ident_type) { 5482 IPSECLOG(LOG_DEBUG, "ident type mismatch.\n"); 5483 return EINVAL; 5484 } 5485 5486 switch (idsrc->sadb_ident_type) { 5487 case SADB_IDENTTYPE_PREFIX: 5488 case SADB_IDENTTYPE_FQDN: 5489 case SADB_IDENTTYPE_USERFQDN: 5490 default: 5491 /* XXX do nothing */ 5492 sah->idents = NULL; 5493 sah->identd = NULL; 5494 return 0; 5495 } 5496 5497 /* make structure */ 5498 sah->idents = kmem_alloc(idsrclen, KM_SLEEP); 5499 sah->idents_len = idsrclen; 5500 sah->identd = kmem_alloc(iddstlen, KM_SLEEP); 5501 sah->identd_len = iddstlen; 5502 memcpy(sah->idents, idsrc, idsrclen); 5503 memcpy(sah->identd, iddst, iddstlen); 5504 5505 return 0; 5506 } 5507 5508 /* 5509 * m will not be freed on return. 5510 * it is caller's responsibility to free the result. 5511 */ 5512 static struct mbuf * 5513 key_getmsgbuf_x1(struct mbuf *m, const struct sadb_msghdr *mhp) 5514 { 5515 struct mbuf *n; 5516 5517 KASSERT(m != NULL); 5518 KASSERT(mhp != NULL); 5519 KASSERT(mhp->msg != NULL); 5520 5521 /* create new sadb_msg to reply. */ 5522 n = key_gather_mbuf(m, mhp, 1, 15, SADB_EXT_RESERVED, 5523 SADB_EXT_SA, SADB_X_EXT_SA2, 5524 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST, 5525 SADB_EXT_LIFETIME_HARD, SADB_EXT_LIFETIME_SOFT, 5526 SADB_EXT_IDENTITY_SRC, SADB_EXT_IDENTITY_DST, 5527 SADB_X_EXT_NAT_T_TYPE, SADB_X_EXT_NAT_T_SPORT, 5528 SADB_X_EXT_NAT_T_DPORT, SADB_X_EXT_NAT_T_OAI, 5529 SADB_X_EXT_NAT_T_OAR, SADB_X_EXT_NAT_T_FRAG); 5530 if (!n) 5531 return NULL; 5532 5533 if (n->m_len < sizeof(struct sadb_msg)) { 5534 n = m_pullup(n, sizeof(struct sadb_msg)); 5535 if (n == NULL) 5536 return NULL; 5537 } 5538 mtod(n, struct sadb_msg *)->sadb_msg_errno = 0; 5539 mtod(n, struct sadb_msg *)->sadb_msg_len = 5540 PFKEY_UNIT64(n->m_pkthdr.len); 5541 5542 return n; 5543 } 5544 5545 static int key_delete_all (struct socket *, struct mbuf *, 5546 const struct sadb_msghdr *, u_int16_t); 5547 5548 /* 5549 * SADB_DELETE processing 5550 * receive 5551 * <base, SA(*), address(SD)> 5552 * from the ikmpd, and set SADB_SASTATE_DEAD, 5553 * and send, 5554 * <base, SA(*), address(SD)> 5555 * to the ikmpd. 5556 * 5557 * m will always be freed. 5558 */ 5559 static int 5560 key_api_delete(struct socket *so, struct mbuf *m, 5561 const struct sadb_msghdr *mhp) 5562 { 5563 struct sadb_sa *sa0; 5564 const struct sockaddr *src, *dst; 5565 struct secasindex saidx; 5566 struct secashead *sah; 5567 struct secasvar *sav = NULL; 5568 u_int16_t proto; 5569 int error; 5570 5571 /* map satype to proto */ 5572 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 5573 if (proto == 0) { 5574 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5575 return key_senderror(so, m, EINVAL); 5576 } 5577 5578 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5579 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5580 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5581 return key_senderror(so, m, EINVAL); 5582 } 5583 5584 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5585 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5586 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5587 return key_senderror(so, m, EINVAL); 5588 } 5589 5590 if (mhp->ext[SADB_EXT_SA] == NULL) { 5591 /* 5592 * Caller wants us to delete all non-LARVAL SAs 5593 * that match the src/dst. This is used during 5594 * IKE INITIAL-CONTACT. 5595 */ 5596 IPSECLOG(LOG_DEBUG, "doing delete all.\n"); 5597 return key_delete_all(so, m, mhp, proto); 5598 } else if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa)) { 5599 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5600 return key_senderror(so, m, EINVAL); 5601 } 5602 5603 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5604 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5605 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5606 5607 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5608 if (error != 0) 5609 return key_senderror(so, m, EINVAL); 5610 5611 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5612 if (error != 0) 5613 return key_senderror(so, m, EINVAL); 5614 5615 /* get a SA header */ 5616 sah = key_getsah(&saidx, CMP_HEAD); 5617 if (sah != NULL) { 5618 /* get a SA with SPI. */ 5619 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5620 } 5621 5622 if (sav == NULL) { 5623 IPSECLOG(LOG_DEBUG, "no SA found.\n"); 5624 return key_senderror(so, m, ENOENT); 5625 } 5626 5627 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5628 KEY_FREESAV(&sav); 5629 KEY_FREESAV(&sav); 5630 5631 { 5632 struct mbuf *n; 5633 5634 /* create new sadb_msg to reply. */ 5635 n = key_gather_mbuf(m, mhp, 1, 4, SADB_EXT_RESERVED, 5636 SADB_EXT_SA, SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5637 if (!n) 5638 return key_senderror(so, m, ENOBUFS); 5639 5640 n = key_fill_replymsg(n, 0); 5641 if (n == NULL) 5642 return key_senderror(so, m, ENOBUFS); 5643 5644 m_freem(m); 5645 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5646 } 5647 } 5648 5649 /* 5650 * delete all SAs for src/dst. Called from key_api_delete(). 5651 */ 5652 static int 5653 key_delete_all(struct socket *so, struct mbuf *m, 5654 const struct sadb_msghdr *mhp, u_int16_t proto) 5655 { 5656 const struct sockaddr *src, *dst; 5657 struct secasindex saidx; 5658 struct secashead *sah; 5659 struct secasvar *sav, *nextsav; 5660 u_int state; 5661 int error; 5662 5663 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5664 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5665 5666 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5667 if (error != 0) 5668 return key_senderror(so, m, EINVAL); 5669 5670 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5671 if (error != 0) 5672 return key_senderror(so, m, EINVAL); 5673 5674 sah = key_getsah(&saidx, CMP_HEAD); 5675 if (sah != NULL) { 5676 /* Delete all non-LARVAL SAs. */ 5677 SASTATE_ALIVE_FOREACH(state) { 5678 if (state == SADB_SASTATE_LARVAL) 5679 continue; 5680 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, 5681 nextsav) { 5682 /* sanity check */ 5683 if (sav->state != state) { 5684 IPSECLOG(LOG_DEBUG, 5685 "invalid sav->state " 5686 "(queue: %d SA: %d)\n", 5687 state, sav->state); 5688 continue; 5689 } 5690 5691 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 5692 KEY_FREESAV(&sav); 5693 } 5694 } 5695 } 5696 { 5697 struct mbuf *n; 5698 5699 /* create new sadb_msg to reply. */ 5700 n = key_gather_mbuf(m, mhp, 1, 3, SADB_EXT_RESERVED, 5701 SADB_EXT_ADDRESS_SRC, SADB_EXT_ADDRESS_DST); 5702 if (!n) 5703 return key_senderror(so, m, ENOBUFS); 5704 5705 n = key_fill_replymsg(n, 0); 5706 if (n == NULL) 5707 return key_senderror(so, m, ENOBUFS); 5708 5709 m_freem(m); 5710 return key_sendup_mbuf(so, n, KEY_SENDUP_ALL); 5711 } 5712 } 5713 5714 /* 5715 * SADB_GET processing 5716 * receive 5717 * <base, SA(*), address(SD)> 5718 * from the ikmpd, and get a SP and a SA to respond, 5719 * and send, 5720 * <base, SA, (lifetime(HSC),) address(SD), (address(P),) key(AE), 5721 * (identity(SD),) (sensitivity)> 5722 * to the ikmpd. 5723 * 5724 * m will always be freed. 5725 */ 5726 static int 5727 key_api_get(struct socket *so, struct mbuf *m, 5728 const struct sadb_msghdr *mhp) 5729 { 5730 struct sadb_sa *sa0; 5731 const struct sockaddr *src, *dst; 5732 struct secasindex saidx; 5733 struct secashead *sah; 5734 struct secasvar *sav = NULL; 5735 u_int16_t proto; 5736 int error; 5737 5738 /* map satype to proto */ 5739 if ((proto = key_satype2proto(mhp->msg->sadb_msg_satype)) == 0) { 5740 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 5741 return key_senderror(so, m, EINVAL); 5742 } 5743 5744 if (mhp->ext[SADB_EXT_SA] == NULL || 5745 mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 5746 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL) { 5747 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5748 return key_senderror(so, m, EINVAL); 5749 } 5750 if (mhp->extlen[SADB_EXT_SA] < sizeof(struct sadb_sa) || 5751 mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 5752 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address)) { 5753 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 5754 return key_senderror(so, m, EINVAL); 5755 } 5756 5757 sa0 = (struct sadb_sa *)mhp->ext[SADB_EXT_SA]; 5758 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 5759 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 5760 5761 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 5762 if (error != 0) 5763 return key_senderror(so, m, EINVAL); 5764 5765 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 5766 if (error != 0) 5767 return key_senderror(so, m, EINVAL); 5768 5769 /* get a SA header */ 5770 sah = key_getsah(&saidx, CMP_HEAD); 5771 if (sah != NULL) { 5772 /* get a SA with SPI. */ 5773 sav = key_getsavbyspi(sah, sa0->sadb_sa_spi); 5774 } 5775 if (sav == NULL) { 5776 IPSECLOG(LOG_DEBUG, "no SA found.\n"); 5777 return key_senderror(so, m, ENOENT); 5778 } 5779 5780 { 5781 struct mbuf *n; 5782 u_int8_t satype; 5783 5784 /* map proto to satype */ 5785 satype = key_proto2satype(sah->saidx.proto); 5786 if (satype == 0) { 5787 KEY_FREESAV(&sav); 5788 IPSECLOG(LOG_DEBUG, "there was invalid proto in SAD.\n"); 5789 return key_senderror(so, m, EINVAL); 5790 } 5791 5792 /* create new sadb_msg to reply. */ 5793 n = key_setdumpsa(sav, SADB_GET, satype, mhp->msg->sadb_msg_seq, 5794 mhp->msg->sadb_msg_pid); 5795 KEY_FREESAV(&sav); 5796 if (!n) 5797 return key_senderror(so, m, ENOBUFS); 5798 5799 m_freem(m); 5800 return key_sendup_mbuf(so, n, KEY_SENDUP_ONE); 5801 } 5802 } 5803 5804 /* XXX make it sysctl-configurable? */ 5805 static void 5806 key_getcomb_setlifetime(struct sadb_comb *comb) 5807 { 5808 5809 comb->sadb_comb_soft_allocations = 1; 5810 comb->sadb_comb_hard_allocations = 1; 5811 comb->sadb_comb_soft_bytes = 0; 5812 comb->sadb_comb_hard_bytes = 0; 5813 comb->sadb_comb_hard_addtime = 86400; /* 1 day */ 5814 comb->sadb_comb_soft_addtime = comb->sadb_comb_hard_addtime * 80 / 100; 5815 comb->sadb_comb_hard_usetime = 28800; /* 8 hours */ 5816 comb->sadb_comb_soft_usetime = comb->sadb_comb_hard_usetime * 80 / 100; 5817 } 5818 5819 /* 5820 * XXX reorder combinations by preference 5821 * XXX no idea if the user wants ESP authentication or not 5822 */ 5823 static struct mbuf * 5824 key_getcomb_esp(void) 5825 { 5826 struct sadb_comb *comb; 5827 const struct enc_xform *algo; 5828 struct mbuf *result = NULL, *m, *n; 5829 int encmin; 5830 int i, off, o; 5831 int totlen; 5832 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5833 5834 m = NULL; 5835 for (i = 1; i <= SADB_EALG_MAX; i++) { 5836 algo = esp_algorithm_lookup(i); 5837 if (algo == NULL) 5838 continue; 5839 5840 /* discard algorithms with key size smaller than system min */ 5841 if (_BITS(algo->maxkey) < ipsec_esp_keymin) 5842 continue; 5843 if (_BITS(algo->minkey) < ipsec_esp_keymin) 5844 encmin = ipsec_esp_keymin; 5845 else 5846 encmin = _BITS(algo->minkey); 5847 5848 if (ipsec_esp_auth) 5849 m = key_getcomb_ah(); 5850 else { 5851 KASSERTMSG(l <= MLEN, 5852 "l=%u > MLEN=%lu", l, (u_long) MLEN); 5853 MGET(m, M_DONTWAIT, MT_DATA); 5854 if (m) { 5855 M_ALIGN(m, l); 5856 m->m_len = l; 5857 m->m_next = NULL; 5858 memset(mtod(m, void *), 0, m->m_len); 5859 } 5860 } 5861 if (!m) 5862 goto fail; 5863 5864 totlen = 0; 5865 for (n = m; n; n = n->m_next) 5866 totlen += n->m_len; 5867 KASSERTMSG((totlen % l) == 0, "totlen=%u, l=%u", totlen, l); 5868 5869 for (off = 0; off < totlen; off += l) { 5870 n = m_pulldown(m, off, l, &o); 5871 if (!n) { 5872 /* m is already freed */ 5873 goto fail; 5874 } 5875 comb = (struct sadb_comb *)(mtod(n, char *) + o); 5876 memset(comb, 0, sizeof(*comb)); 5877 key_getcomb_setlifetime(comb); 5878 comb->sadb_comb_encrypt = i; 5879 comb->sadb_comb_encrypt_minbits = encmin; 5880 comb->sadb_comb_encrypt_maxbits = _BITS(algo->maxkey); 5881 } 5882 5883 if (!result) 5884 result = m; 5885 else 5886 m_cat(result, m); 5887 } 5888 5889 return result; 5890 5891 fail: 5892 if (result) 5893 m_freem(result); 5894 return NULL; 5895 } 5896 5897 static void 5898 key_getsizes_ah(const struct auth_hash *ah, int alg, 5899 u_int16_t* ksmin, u_int16_t* ksmax) 5900 { 5901 *ksmin = *ksmax = ah->keysize; 5902 if (ah->keysize == 0) { 5903 /* 5904 * Transform takes arbitrary key size but algorithm 5905 * key size is restricted. Enforce this here. 5906 */ 5907 switch (alg) { 5908 case SADB_X_AALG_MD5: *ksmin = *ksmax = 16; break; 5909 case SADB_X_AALG_SHA: *ksmin = *ksmax = 20; break; 5910 case SADB_X_AALG_NULL: *ksmin = 0; *ksmax = 256; break; 5911 default: 5912 IPSECLOG(LOG_DEBUG, "unknown AH algorithm %u\n", alg); 5913 break; 5914 } 5915 } 5916 } 5917 5918 /* 5919 * XXX reorder combinations by preference 5920 */ 5921 static struct mbuf * 5922 key_getcomb_ah(void) 5923 { 5924 struct sadb_comb *comb; 5925 const struct auth_hash *algo; 5926 struct mbuf *m; 5927 u_int16_t minkeysize, maxkeysize; 5928 int i; 5929 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5930 5931 m = NULL; 5932 for (i = 1; i <= SADB_AALG_MAX; i++) { 5933 #if 1 5934 /* we prefer HMAC algorithms, not old algorithms */ 5935 if (i != SADB_AALG_SHA1HMAC && 5936 i != SADB_AALG_MD5HMAC && 5937 i != SADB_X_AALG_SHA2_256 && 5938 i != SADB_X_AALG_SHA2_384 && 5939 i != SADB_X_AALG_SHA2_512) 5940 continue; 5941 #endif 5942 algo = ah_algorithm_lookup(i); 5943 if (!algo) 5944 continue; 5945 key_getsizes_ah(algo, i, &minkeysize, &maxkeysize); 5946 /* discard algorithms with key size smaller than system min */ 5947 if (_BITS(minkeysize) < ipsec_ah_keymin) 5948 continue; 5949 5950 if (!m) { 5951 KASSERTMSG(l <= MLEN, 5952 "l=%u > MLEN=%lu", l, (u_long) MLEN); 5953 MGET(m, M_DONTWAIT, MT_DATA); 5954 if (m) { 5955 M_ALIGN(m, l); 5956 m->m_len = l; 5957 m->m_next = NULL; 5958 } 5959 } else 5960 M_PREPEND(m, l, M_DONTWAIT); 5961 if (!m) 5962 return NULL; 5963 5964 if (m->m_len < sizeof(struct sadb_comb)) { 5965 m = m_pullup(m, sizeof(struct sadb_comb)); 5966 if (m == NULL) 5967 return NULL; 5968 } 5969 5970 comb = mtod(m, struct sadb_comb *); 5971 memset(comb, 0, sizeof(*comb)); 5972 key_getcomb_setlifetime(comb); 5973 comb->sadb_comb_auth = i; 5974 comb->sadb_comb_auth_minbits = _BITS(minkeysize); 5975 comb->sadb_comb_auth_maxbits = _BITS(maxkeysize); 5976 } 5977 5978 return m; 5979 } 5980 5981 /* 5982 * not really an official behavior. discussed in pf_key (at) inner.net in Sep2000. 5983 * XXX reorder combinations by preference 5984 */ 5985 static struct mbuf * 5986 key_getcomb_ipcomp(void) 5987 { 5988 struct sadb_comb *comb; 5989 const struct comp_algo *algo; 5990 struct mbuf *m; 5991 int i; 5992 const int l = PFKEY_ALIGN8(sizeof(struct sadb_comb)); 5993 5994 m = NULL; 5995 for (i = 1; i <= SADB_X_CALG_MAX; i++) { 5996 algo = ipcomp_algorithm_lookup(i); 5997 if (!algo) 5998 continue; 5999 6000 if (!m) { 6001 KASSERTMSG(l <= MLEN, 6002 "l=%u > MLEN=%lu", l, (u_long) MLEN); 6003 MGET(m, M_DONTWAIT, MT_DATA); 6004 if (m) { 6005 M_ALIGN(m, l); 6006 m->m_len = l; 6007 m->m_next = NULL; 6008 } 6009 } else 6010 M_PREPEND(m, l, M_DONTWAIT); 6011 if (!m) 6012 return NULL; 6013 6014 if (m->m_len < sizeof(struct sadb_comb)) { 6015 m = m_pullup(m, sizeof(struct sadb_comb)); 6016 if (m == NULL) 6017 return NULL; 6018 } 6019 6020 comb = mtod(m, struct sadb_comb *); 6021 memset(comb, 0, sizeof(*comb)); 6022 key_getcomb_setlifetime(comb); 6023 comb->sadb_comb_encrypt = i; 6024 /* what should we set into sadb_comb_*_{min,max}bits? */ 6025 } 6026 6027 return m; 6028 } 6029 6030 /* 6031 * XXX no way to pass mode (transport/tunnel) to userland 6032 * XXX replay checking? 6033 * XXX sysctl interface to ipsec_{ah,esp}_keymin 6034 */ 6035 static struct mbuf * 6036 key_getprop(const struct secasindex *saidx) 6037 { 6038 struct sadb_prop *prop; 6039 struct mbuf *m, *n; 6040 const int l = PFKEY_ALIGN8(sizeof(struct sadb_prop)); 6041 int totlen; 6042 6043 switch (saidx->proto) { 6044 case IPPROTO_ESP: 6045 m = key_getcomb_esp(); 6046 break; 6047 case IPPROTO_AH: 6048 m = key_getcomb_ah(); 6049 break; 6050 case IPPROTO_IPCOMP: 6051 m = key_getcomb_ipcomp(); 6052 break; 6053 default: 6054 return NULL; 6055 } 6056 6057 if (!m) 6058 return NULL; 6059 M_PREPEND(m, l, M_DONTWAIT); 6060 if (!m) 6061 return NULL; 6062 6063 totlen = 0; 6064 for (n = m; n; n = n->m_next) 6065 totlen += n->m_len; 6066 6067 prop = mtod(m, struct sadb_prop *); 6068 memset(prop, 0, sizeof(*prop)); 6069 prop->sadb_prop_len = PFKEY_UNIT64(totlen); 6070 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 6071 prop->sadb_prop_replay = 32; /* XXX */ 6072 6073 return m; 6074 } 6075 6076 /* 6077 * SADB_ACQUIRE processing called by key_checkrequest() and key_api_acquire(). 6078 * send 6079 * <base, SA, address(SD), (address(P)), x_policy, 6080 * (identity(SD),) (sensitivity,) proposal> 6081 * to KMD, and expect to receive 6082 * <base> with SADB_ACQUIRE if error occurred, 6083 * or 6084 * <base, src address, dst address, (SPI range)> with SADB_GETSPI 6085 * from KMD by PF_KEY. 6086 * 6087 * XXX x_policy is outside of RFC2367 (KAME extension). 6088 * XXX sensitivity is not supported. 6089 * XXX for ipcomp, RFC2367 does not define how to fill in proposal. 6090 * see comment for key_getcomb_ipcomp(). 6091 * 6092 * OUT: 6093 * 0 : succeed 6094 * others: error number 6095 */ 6096 static int 6097 key_acquire(const struct secasindex *saidx, struct secpolicy *sp) 6098 { 6099 struct mbuf *result = NULL, *m; 6100 #ifndef IPSEC_NONBLOCK_ACQUIRE 6101 struct secacq *newacq; 6102 #endif 6103 u_int8_t satype; 6104 int error = -1; 6105 u_int32_t seq; 6106 6107 /* sanity check */ 6108 KASSERT(saidx != NULL); 6109 satype = key_proto2satype(saidx->proto); 6110 KASSERTMSG(satype != 0, "null satype, protocol %u", saidx->proto); 6111 6112 #ifndef IPSEC_NONBLOCK_ACQUIRE 6113 /* 6114 * We never do anything about acquirng SA. There is anather 6115 * solution that kernel blocks to send SADB_ACQUIRE message until 6116 * getting something message from IKEd. In later case, to be 6117 * managed with ACQUIRING list. 6118 */ 6119 /* Get an entry to check whether sending message or not. */ 6120 mutex_enter(&key_mtx); 6121 newacq = key_getacq(saidx); 6122 if (newacq != NULL) { 6123 if (key_blockacq_count < newacq->count) { 6124 /* reset counter and do send message. */ 6125 newacq->count = 0; 6126 } else { 6127 /* increment counter and do nothing. */ 6128 newacq->count++; 6129 mutex_exit(&key_mtx); 6130 return 0; 6131 } 6132 } else { 6133 /* make new entry for blocking to send SADB_ACQUIRE. */ 6134 newacq = key_newacq(saidx); 6135 if (newacq == NULL) 6136 return ENOBUFS; 6137 6138 /* add to acqtree */ 6139 LIST_INSERT_HEAD(&acqtree, newacq, chain); 6140 } 6141 6142 seq = newacq->seq; 6143 mutex_exit(&key_mtx); 6144 #else 6145 seq = (acq_seq = (acq_seq == ~0 ? 1 : ++acq_seq)); 6146 #endif 6147 m = key_setsadbmsg(SADB_ACQUIRE, 0, satype, seq, 0, 0); 6148 if (!m) { 6149 error = ENOBUFS; 6150 goto fail; 6151 } 6152 result = m; 6153 6154 /* set sadb_address for saidx's. */ 6155 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &saidx->src.sa, FULLMASK, 6156 IPSEC_ULPROTO_ANY); 6157 if (!m) { 6158 error = ENOBUFS; 6159 goto fail; 6160 } 6161 m_cat(result, m); 6162 6163 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &saidx->dst.sa, FULLMASK, 6164 IPSEC_ULPROTO_ANY); 6165 if (!m) { 6166 error = ENOBUFS; 6167 goto fail; 6168 } 6169 m_cat(result, m); 6170 6171 /* XXX proxy address (optional) */ 6172 6173 /* set sadb_x_policy */ 6174 if (sp) { 6175 m = key_setsadbxpolicy(sp->policy, sp->spidx.dir, sp->id); 6176 if (!m) { 6177 error = ENOBUFS; 6178 goto fail; 6179 } 6180 m_cat(result, m); 6181 } 6182 6183 /* XXX identity (optional) */ 6184 #if 0 6185 if (idexttype && fqdn) { 6186 /* create identity extension (FQDN) */ 6187 struct sadb_ident *id; 6188 int fqdnlen; 6189 6190 fqdnlen = strlen(fqdn) + 1; /* +1 for terminating-NUL */ 6191 id = (struct sadb_ident *)p; 6192 memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6193 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(fqdnlen)); 6194 id->sadb_ident_exttype = idexttype; 6195 id->sadb_ident_type = SADB_IDENTTYPE_FQDN; 6196 memcpy(id + 1, fqdn, fqdnlen); 6197 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(fqdnlen); 6198 } 6199 6200 if (idexttype) { 6201 /* create identity extension (USERFQDN) */ 6202 struct sadb_ident *id; 6203 int userfqdnlen; 6204 6205 if (userfqdn) { 6206 /* +1 for terminating-NUL */ 6207 userfqdnlen = strlen(userfqdn) + 1; 6208 } else 6209 userfqdnlen = 0; 6210 id = (struct sadb_ident *)p; 6211 memset(id, 0, sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6212 id->sadb_ident_len = PFKEY_UNIT64(sizeof(*id) + PFKEY_ALIGN8(userfqdnlen)); 6213 id->sadb_ident_exttype = idexttype; 6214 id->sadb_ident_type = SADB_IDENTTYPE_USERFQDN; 6215 /* XXX is it correct? */ 6216 if (curlwp) 6217 id->sadb_ident_id = kauth_cred_getuid(curlwp->l_cred); 6218 if (userfqdn && userfqdnlen) 6219 memcpy(id + 1, userfqdn, userfqdnlen); 6220 p += sizeof(struct sadb_ident) + PFKEY_ALIGN8(userfqdnlen); 6221 } 6222 #endif 6223 6224 /* XXX sensitivity (optional) */ 6225 6226 /* create proposal/combination extension */ 6227 m = key_getprop(saidx); 6228 #if 0 6229 /* 6230 * spec conformant: always attach proposal/combination extension, 6231 * the problem is that we have no way to attach it for ipcomp, 6232 * due to the way sadb_comb is declared in RFC2367. 6233 */ 6234 if (!m) { 6235 error = ENOBUFS; 6236 goto fail; 6237 } 6238 m_cat(result, m); 6239 #else 6240 /* 6241 * outside of spec; make proposal/combination extension optional. 6242 */ 6243 if (m) 6244 m_cat(result, m); 6245 #endif 6246 6247 if ((result->m_flags & M_PKTHDR) == 0) { 6248 error = EINVAL; 6249 goto fail; 6250 } 6251 6252 if (result->m_len < sizeof(struct sadb_msg)) { 6253 result = m_pullup(result, sizeof(struct sadb_msg)); 6254 if (result == NULL) { 6255 error = ENOBUFS; 6256 goto fail; 6257 } 6258 } 6259 6260 result->m_pkthdr.len = 0; 6261 for (m = result; m; m = m->m_next) 6262 result->m_pkthdr.len += m->m_len; 6263 6264 mtod(result, struct sadb_msg *)->sadb_msg_len = 6265 PFKEY_UNIT64(result->m_pkthdr.len); 6266 6267 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6268 6269 fail: 6270 if (result) 6271 m_freem(result); 6272 return error; 6273 } 6274 6275 #ifndef IPSEC_NONBLOCK_ACQUIRE 6276 static struct secacq * 6277 key_newacq(const struct secasindex *saidx) 6278 { 6279 struct secacq *newacq; 6280 6281 /* get new entry */ 6282 newacq = kmem_intr_zalloc(sizeof(struct secacq), KM_NOSLEEP); 6283 if (newacq == NULL) { 6284 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6285 return NULL; 6286 } 6287 6288 /* copy secindex */ 6289 memcpy(&newacq->saidx, saidx, sizeof(newacq->saidx)); 6290 newacq->seq = (acq_seq == ~0 ? 1 : ++acq_seq); 6291 newacq->created = time_uptime; 6292 newacq->count = 0; 6293 6294 return newacq; 6295 } 6296 6297 static struct secacq * 6298 key_getacq(const struct secasindex *saidx) 6299 { 6300 struct secacq *acq; 6301 6302 KASSERT(mutex_owned(&key_mtx)); 6303 6304 LIST_FOREACH(acq, &acqtree, chain) { 6305 if (key_saidx_match(saidx, &acq->saidx, CMP_EXACTLY)) 6306 return acq; 6307 } 6308 6309 return NULL; 6310 } 6311 6312 static struct secacq * 6313 key_getacqbyseq(u_int32_t seq) 6314 { 6315 struct secacq *acq; 6316 6317 KASSERT(mutex_owned(&key_mtx)); 6318 6319 LIST_FOREACH(acq, &acqtree, chain) { 6320 if (acq->seq == seq) 6321 return acq; 6322 } 6323 6324 return NULL; 6325 } 6326 #endif 6327 6328 #ifdef notyet 6329 static struct secspacq * 6330 key_newspacq(const struct secpolicyindex *spidx) 6331 { 6332 struct secspacq *acq; 6333 6334 /* get new entry */ 6335 acq = kmem_intr_zalloc(sizeof(struct secspacq), KM_NOSLEEP); 6336 if (acq == NULL) { 6337 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6338 return NULL; 6339 } 6340 6341 /* copy secindex */ 6342 memcpy(&acq->spidx, spidx, sizeof(acq->spidx)); 6343 acq->created = time_uptime; 6344 acq->count = 0; 6345 6346 return acq; 6347 } 6348 6349 static struct secspacq * 6350 key_getspacq(const struct secpolicyindex *spidx) 6351 { 6352 struct secspacq *acq; 6353 6354 LIST_FOREACH(acq, &spacqtree, chain) { 6355 if (key_spidx_match_exactly(spidx, &acq->spidx)) 6356 return acq; 6357 } 6358 6359 return NULL; 6360 } 6361 #endif /* notyet */ 6362 6363 /* 6364 * SADB_ACQUIRE processing, 6365 * in first situation, is receiving 6366 * <base> 6367 * from the ikmpd, and clear sequence of its secasvar entry. 6368 * 6369 * In second situation, is receiving 6370 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6371 * from a user land process, and return 6372 * <base, address(SD), (address(P),) (identity(SD),) (sensitivity,) proposal> 6373 * to the socket. 6374 * 6375 * m will always be freed. 6376 */ 6377 static int 6378 key_api_acquire(struct socket *so, struct mbuf *m, 6379 const struct sadb_msghdr *mhp) 6380 { 6381 const struct sockaddr *src, *dst; 6382 struct secasindex saidx; 6383 struct secashead *sah; 6384 u_int16_t proto; 6385 int error; 6386 6387 /* 6388 * Error message from KMd. 6389 * We assume that if error was occurred in IKEd, the length of PFKEY 6390 * message is equal to the size of sadb_msg structure. 6391 * We do not raise error even if error occurred in this function. 6392 */ 6393 if (mhp->msg->sadb_msg_len == PFKEY_UNIT64(sizeof(struct sadb_msg))) { 6394 #ifndef IPSEC_NONBLOCK_ACQUIRE 6395 struct secacq *acq; 6396 6397 /* check sequence number */ 6398 if (mhp->msg->sadb_msg_seq == 0) { 6399 IPSECLOG(LOG_DEBUG, "must specify sequence number.\n"); 6400 m_freem(m); 6401 return 0; 6402 } 6403 6404 mutex_enter(&key_mtx); 6405 acq = key_getacqbyseq(mhp->msg->sadb_msg_seq); 6406 if (acq == NULL) { 6407 mutex_exit(&key_mtx); 6408 /* 6409 * the specified larval SA is already gone, or we got 6410 * a bogus sequence number. we can silently ignore it. 6411 */ 6412 m_freem(m); 6413 return 0; 6414 } 6415 6416 /* reset acq counter in order to deletion by timehander. */ 6417 acq->created = time_uptime; 6418 acq->count = 0; 6419 mutex_exit(&key_mtx); 6420 #endif 6421 m_freem(m); 6422 return 0; 6423 } 6424 6425 /* 6426 * This message is from user land. 6427 */ 6428 6429 /* map satype to proto */ 6430 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 6431 if (proto == 0) { 6432 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6433 return key_senderror(so, m, EINVAL); 6434 } 6435 6436 if (mhp->ext[SADB_EXT_ADDRESS_SRC] == NULL || 6437 mhp->ext[SADB_EXT_ADDRESS_DST] == NULL || 6438 mhp->ext[SADB_EXT_PROPOSAL] == NULL) { 6439 /* error */ 6440 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 6441 return key_senderror(so, m, EINVAL); 6442 } 6443 if (mhp->extlen[SADB_EXT_ADDRESS_SRC] < sizeof(struct sadb_address) || 6444 mhp->extlen[SADB_EXT_ADDRESS_DST] < sizeof(struct sadb_address) || 6445 mhp->extlen[SADB_EXT_PROPOSAL] < sizeof(struct sadb_prop)) { 6446 /* error */ 6447 IPSECLOG(LOG_DEBUG, "invalid message is passed.\n"); 6448 return key_senderror(so, m, EINVAL); 6449 } 6450 6451 src = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_SRC); 6452 dst = key_msghdr_get_sockaddr(mhp, SADB_EXT_ADDRESS_DST); 6453 6454 error = key_setsecasidx(proto, IPSEC_MODE_ANY, 0, src, dst, &saidx); 6455 if (error != 0) 6456 return key_senderror(so, m, EINVAL); 6457 6458 error = key_set_natt_ports(&saidx.src, &saidx.dst, mhp); 6459 if (error != 0) 6460 return key_senderror(so, m, EINVAL); 6461 6462 /* get a SA index */ 6463 sah = key_getsah(&saidx, CMP_MODE_REQID); 6464 if (sah != NULL) { 6465 IPSECLOG(LOG_DEBUG, "a SA exists already.\n"); 6466 return key_senderror(so, m, EEXIST); 6467 } 6468 6469 error = key_acquire(&saidx, NULL); 6470 if (error != 0) { 6471 IPSECLOG(LOG_DEBUG, "error %d returned from key_acquire.\n", 6472 error); 6473 return key_senderror(so, m, error); 6474 } 6475 6476 return key_sendup_mbuf(so, m, KEY_SENDUP_REGISTERED); 6477 } 6478 6479 /* 6480 * SADB_REGISTER processing. 6481 * If SATYPE_UNSPEC has been passed as satype, only return sabd_supported. 6482 * receive 6483 * <base> 6484 * from the ikmpd, and register a socket to send PF_KEY messages, 6485 * and send 6486 * <base, supported> 6487 * to KMD by PF_KEY. 6488 * If socket is detached, must free from regnode. 6489 * 6490 * m will always be freed. 6491 */ 6492 static int 6493 key_api_register(struct socket *so, struct mbuf *m, 6494 const struct sadb_msghdr *mhp) 6495 { 6496 struct secreg *reg, *newreg = 0; 6497 6498 /* check for invalid register message */ 6499 if (mhp->msg->sadb_msg_satype >= __arraycount(regtree)) 6500 return key_senderror(so, m, EINVAL); 6501 6502 /* When SATYPE_UNSPEC is specified, only return sabd_supported. */ 6503 if (mhp->msg->sadb_msg_satype == SADB_SATYPE_UNSPEC) 6504 goto setmsg; 6505 6506 /* Allocate regnode in advance, out of mutex */ 6507 newreg = kmem_zalloc(sizeof(*newreg), KM_SLEEP); 6508 6509 /* check whether existing or not */ 6510 mutex_enter(&key_mtx); 6511 LIST_FOREACH(reg, ®tree[mhp->msg->sadb_msg_satype], chain) { 6512 if (reg->so == so) { 6513 IPSECLOG(LOG_DEBUG, "socket exists already.\n"); 6514 mutex_exit(&key_mtx); 6515 kmem_free(newreg, sizeof(*newreg)); 6516 return key_senderror(so, m, EEXIST); 6517 } 6518 } 6519 6520 newreg->so = so; 6521 ((struct keycb *)sotorawcb(so))->kp_registered++; 6522 6523 /* add regnode to regtree. */ 6524 LIST_INSERT_HEAD(®tree[mhp->msg->sadb_msg_satype], newreg, chain); 6525 mutex_exit(&key_mtx); 6526 6527 setmsg: 6528 { 6529 struct mbuf *n; 6530 struct sadb_supported *sup; 6531 u_int len, alen, elen; 6532 int off; 6533 int i; 6534 struct sadb_alg *alg; 6535 6536 /* create new sadb_msg to reply. */ 6537 alen = 0; 6538 for (i = 1; i <= SADB_AALG_MAX; i++) { 6539 if (ah_algorithm_lookup(i)) 6540 alen += sizeof(struct sadb_alg); 6541 } 6542 if (alen) 6543 alen += sizeof(struct sadb_supported); 6544 elen = 0; 6545 for (i = 1; i <= SADB_EALG_MAX; i++) { 6546 if (esp_algorithm_lookup(i)) 6547 elen += sizeof(struct sadb_alg); 6548 } 6549 if (elen) 6550 elen += sizeof(struct sadb_supported); 6551 6552 len = sizeof(struct sadb_msg) + alen + elen; 6553 6554 if (len > MCLBYTES) 6555 return key_senderror(so, m, ENOBUFS); 6556 6557 MGETHDR(n, M_DONTWAIT, MT_DATA); 6558 if (len > MHLEN) { 6559 MCLGET(n, M_DONTWAIT); 6560 if ((n->m_flags & M_EXT) == 0) { 6561 m_freem(n); 6562 n = NULL; 6563 } 6564 } 6565 if (!n) 6566 return key_senderror(so, m, ENOBUFS); 6567 6568 n->m_pkthdr.len = n->m_len = len; 6569 n->m_next = NULL; 6570 off = 0; 6571 6572 m_copydata(m, 0, sizeof(struct sadb_msg), mtod(n, char *) + off); 6573 n = key_fill_replymsg(n, 0); 6574 if (n == NULL) 6575 return key_senderror(so, m, ENOBUFS); 6576 6577 off += PFKEY_ALIGN8(sizeof(struct sadb_msg)); 6578 6579 /* for authentication algorithm */ 6580 if (alen) { 6581 sup = (struct sadb_supported *)(mtod(n, char *) + off); 6582 sup->sadb_supported_len = PFKEY_UNIT64(alen); 6583 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 6584 off += PFKEY_ALIGN8(sizeof(*sup)); 6585 6586 for (i = 1; i <= SADB_AALG_MAX; i++) { 6587 const struct auth_hash *aalgo; 6588 u_int16_t minkeysize, maxkeysize; 6589 6590 aalgo = ah_algorithm_lookup(i); 6591 if (!aalgo) 6592 continue; 6593 alg = (struct sadb_alg *)(mtod(n, char *) + off); 6594 alg->sadb_alg_id = i; 6595 alg->sadb_alg_ivlen = 0; 6596 key_getsizes_ah(aalgo, i, &minkeysize, &maxkeysize); 6597 alg->sadb_alg_minbits = _BITS(minkeysize); 6598 alg->sadb_alg_maxbits = _BITS(maxkeysize); 6599 off += PFKEY_ALIGN8(sizeof(*alg)); 6600 } 6601 } 6602 6603 /* for encryption algorithm */ 6604 if (elen) { 6605 sup = (struct sadb_supported *)(mtod(n, char *) + off); 6606 sup->sadb_supported_len = PFKEY_UNIT64(elen); 6607 sup->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; 6608 off += PFKEY_ALIGN8(sizeof(*sup)); 6609 6610 for (i = 1; i <= SADB_EALG_MAX; i++) { 6611 const struct enc_xform *ealgo; 6612 6613 ealgo = esp_algorithm_lookup(i); 6614 if (!ealgo) 6615 continue; 6616 alg = (struct sadb_alg *)(mtod(n, char *) + off); 6617 alg->sadb_alg_id = i; 6618 alg->sadb_alg_ivlen = ealgo->blocksize; 6619 alg->sadb_alg_minbits = _BITS(ealgo->minkey); 6620 alg->sadb_alg_maxbits = _BITS(ealgo->maxkey); 6621 off += PFKEY_ALIGN8(sizeof(struct sadb_alg)); 6622 } 6623 } 6624 6625 KASSERTMSG(off == len, "length inconsistency"); 6626 6627 m_freem(m); 6628 return key_sendup_mbuf(so, n, KEY_SENDUP_REGISTERED); 6629 } 6630 } 6631 6632 /* 6633 * free secreg entry registered. 6634 * XXX: I want to do free a socket marked done SADB_RESIGER to socket. 6635 */ 6636 void 6637 key_freereg(struct socket *so) 6638 { 6639 struct secreg *reg; 6640 int i; 6641 6642 KASSERT(!cpu_softintr_p()); 6643 KASSERT(so != NULL); 6644 6645 /* 6646 * check whether existing or not. 6647 * check all type of SA, because there is a potential that 6648 * one socket is registered to multiple type of SA. 6649 */ 6650 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 6651 mutex_enter(&key_mtx); 6652 LIST_FOREACH(reg, ®tree[i], chain) { 6653 if (reg->so == so) { 6654 LIST_REMOVE(reg, chain); 6655 break; 6656 } 6657 } 6658 mutex_exit(&key_mtx); 6659 if (reg != NULL) 6660 kmem_free(reg, sizeof(*reg)); 6661 } 6662 6663 return; 6664 } 6665 6666 /* 6667 * SADB_EXPIRE processing 6668 * send 6669 * <base, SA, SA2, lifetime(C and one of HS), address(SD)> 6670 * to KMD by PF_KEY. 6671 * NOTE: We send only soft lifetime extension. 6672 * 6673 * OUT: 0 : succeed 6674 * others : error number 6675 */ 6676 static int 6677 key_expire(struct secasvar *sav) 6678 { 6679 int s; 6680 int satype; 6681 struct mbuf *result = NULL, *m; 6682 int len; 6683 int error = -1; 6684 struct sadb_lifetime *lt; 6685 6686 /* XXX: Why do we lock ? */ 6687 s = splsoftnet(); /*called from softclock()*/ 6688 6689 KASSERT(sav != NULL); 6690 6691 satype = key_proto2satype(sav->sah->saidx.proto); 6692 KASSERTMSG(satype != 0, "invalid proto is passed"); 6693 6694 /* set msg header */ 6695 m = key_setsadbmsg(SADB_EXPIRE, 0, satype, sav->seq, 0, sav->refcnt); 6696 if (!m) { 6697 error = ENOBUFS; 6698 goto fail; 6699 } 6700 result = m; 6701 6702 /* create SA extension */ 6703 m = key_setsadbsa(sav); 6704 if (!m) { 6705 error = ENOBUFS; 6706 goto fail; 6707 } 6708 m_cat(result, m); 6709 6710 /* create SA extension */ 6711 m = key_setsadbxsa2(sav->sah->saidx.mode, 6712 sav->replay ? sav->replay->count : 0, sav->sah->saidx.reqid); 6713 if (!m) { 6714 error = ENOBUFS; 6715 goto fail; 6716 } 6717 m_cat(result, m); 6718 6719 /* create lifetime extension (current and soft) */ 6720 len = PFKEY_ALIGN8(sizeof(*lt)) * 2; 6721 m = key_alloc_mbuf(len); 6722 if (!m || m->m_next) { /*XXX*/ 6723 if (m) 6724 m_freem(m); 6725 error = ENOBUFS; 6726 goto fail; 6727 } 6728 memset(mtod(m, void *), 0, len); 6729 lt = mtod(m, struct sadb_lifetime *); 6730 lt->sadb_lifetime_len = PFKEY_UNIT64(sizeof(struct sadb_lifetime)); 6731 lt->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; 6732 lt->sadb_lifetime_allocations = sav->lft_c->sadb_lifetime_allocations; 6733 lt->sadb_lifetime_bytes = sav->lft_c->sadb_lifetime_bytes; 6734 lt->sadb_lifetime_addtime = 6735 time_mono_to_wall(sav->lft_c->sadb_lifetime_addtime); 6736 lt->sadb_lifetime_usetime = 6737 time_mono_to_wall(sav->lft_c->sadb_lifetime_usetime); 6738 lt = (struct sadb_lifetime *)(mtod(m, char *) + len / 2); 6739 memcpy(lt, sav->lft_s, sizeof(*lt)); 6740 m_cat(result, m); 6741 6742 /* set sadb_address for source */ 6743 m = key_setsadbaddr(SADB_EXT_ADDRESS_SRC, &sav->sah->saidx.src.sa, 6744 FULLMASK, IPSEC_ULPROTO_ANY); 6745 if (!m) { 6746 error = ENOBUFS; 6747 goto fail; 6748 } 6749 m_cat(result, m); 6750 6751 /* set sadb_address for destination */ 6752 m = key_setsadbaddr(SADB_EXT_ADDRESS_DST, &sav->sah->saidx.dst.sa, 6753 FULLMASK, IPSEC_ULPROTO_ANY); 6754 if (!m) { 6755 error = ENOBUFS; 6756 goto fail; 6757 } 6758 m_cat(result, m); 6759 6760 if ((result->m_flags & M_PKTHDR) == 0) { 6761 error = EINVAL; 6762 goto fail; 6763 } 6764 6765 if (result->m_len < sizeof(struct sadb_msg)) { 6766 result = m_pullup(result, sizeof(struct sadb_msg)); 6767 if (result == NULL) { 6768 error = ENOBUFS; 6769 goto fail; 6770 } 6771 } 6772 6773 result->m_pkthdr.len = 0; 6774 for (m = result; m; m = m->m_next) 6775 result->m_pkthdr.len += m->m_len; 6776 6777 mtod(result, struct sadb_msg *)->sadb_msg_len = 6778 PFKEY_UNIT64(result->m_pkthdr.len); 6779 6780 splx(s); 6781 return key_sendup_mbuf(NULL, result, KEY_SENDUP_REGISTERED); 6782 6783 fail: 6784 if (result) 6785 m_freem(result); 6786 splx(s); 6787 return error; 6788 } 6789 6790 /* 6791 * SADB_FLUSH processing 6792 * receive 6793 * <base> 6794 * from the ikmpd, and free all entries in secastree. 6795 * and send, 6796 * <base> 6797 * to the ikmpd. 6798 * NOTE: to do is only marking SADB_SASTATE_DEAD. 6799 * 6800 * m will always be freed. 6801 */ 6802 static int 6803 key_api_flush(struct socket *so, struct mbuf *m, 6804 const struct sadb_msghdr *mhp) 6805 { 6806 struct sadb_msg *newmsg; 6807 struct secashead *sah; 6808 struct secasvar *sav, *nextsav; 6809 u_int16_t proto; 6810 u_int8_t state; 6811 6812 /* map satype to proto */ 6813 proto = key_satype2proto(mhp->msg->sadb_msg_satype); 6814 if (proto == 0) { 6815 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6816 return key_senderror(so, m, EINVAL); 6817 } 6818 6819 /* no SATYPE specified, i.e. flushing all SA. */ 6820 LIST_FOREACH(sah, &sahtree, chain) { 6821 if (mhp->msg->sadb_msg_satype != SADB_SATYPE_UNSPEC && 6822 proto != sah->saidx.proto) 6823 continue; 6824 6825 SASTATE_ALIVE_FOREACH(state) { 6826 LIST_FOREACH_SAFE(sav, &sah->savtree[state], chain, 6827 nextsav) { 6828 key_sa_chgstate(sav, SADB_SASTATE_DEAD); 6829 KEY_FREESAV(&sav); 6830 } 6831 } 6832 6833 sah->state = SADB_SASTATE_DEAD; 6834 } 6835 6836 if (m->m_len < sizeof(struct sadb_msg) || 6837 sizeof(struct sadb_msg) > m->m_len + M_TRAILINGSPACE(m)) { 6838 IPSECLOG(LOG_DEBUG, "No more memory.\n"); 6839 return key_senderror(so, m, ENOBUFS); 6840 } 6841 6842 if (m->m_next) 6843 m_freem(m->m_next); 6844 m->m_next = NULL; 6845 m->m_pkthdr.len = m->m_len = sizeof(struct sadb_msg); 6846 newmsg = mtod(m, struct sadb_msg *); 6847 newmsg->sadb_msg_errno = 0; 6848 newmsg->sadb_msg_len = PFKEY_UNIT64(m->m_pkthdr.len); 6849 6850 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 6851 } 6852 6853 6854 static struct mbuf * 6855 key_setdump_chain(u_int8_t req_satype, int *errorp, int *lenp, pid_t pid) 6856 { 6857 struct secashead *sah; 6858 struct secasvar *sav; 6859 u_int16_t proto; 6860 u_int8_t satype; 6861 u_int8_t state; 6862 int cnt; 6863 struct mbuf *m, *n, *prev; 6864 6865 *lenp = 0; 6866 6867 /* map satype to proto */ 6868 proto = key_satype2proto(req_satype); 6869 if (proto == 0) { 6870 *errorp = EINVAL; 6871 return (NULL); 6872 } 6873 6874 /* count sav entries to be sent to userland. */ 6875 cnt = 0; 6876 LIST_FOREACH(sah, &sahtree, chain) { 6877 if (req_satype != SADB_SATYPE_UNSPEC && 6878 proto != sah->saidx.proto) 6879 continue; 6880 6881 SASTATE_ANY_FOREACH(state) { 6882 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6883 cnt++; 6884 } 6885 } 6886 } 6887 6888 if (cnt == 0) { 6889 *errorp = ENOENT; 6890 return (NULL); 6891 } 6892 6893 /* send this to the userland, one at a time. */ 6894 m = NULL; 6895 prev = m; 6896 LIST_FOREACH(sah, &sahtree, chain) { 6897 if (req_satype != SADB_SATYPE_UNSPEC && 6898 proto != sah->saidx.proto) 6899 continue; 6900 6901 /* map proto to satype */ 6902 satype = key_proto2satype(sah->saidx.proto); 6903 if (satype == 0) { 6904 m_freem(m); 6905 *errorp = EINVAL; 6906 return (NULL); 6907 } 6908 6909 SASTATE_ANY_FOREACH(state) { 6910 LIST_FOREACH(sav, &sah->savtree[state], chain) { 6911 n = key_setdumpsa(sav, SADB_DUMP, satype, 6912 --cnt, pid); 6913 if (!n) { 6914 m_freem(m); 6915 *errorp = ENOBUFS; 6916 return (NULL); 6917 } 6918 6919 if (!m) 6920 m = n; 6921 else 6922 prev->m_nextpkt = n; 6923 prev = n; 6924 } 6925 } 6926 } 6927 6928 if (!m) { 6929 *errorp = EINVAL; 6930 return (NULL); 6931 } 6932 6933 if ((m->m_flags & M_PKTHDR) != 0) { 6934 m->m_pkthdr.len = 0; 6935 for (n = m; n; n = n->m_next) 6936 m->m_pkthdr.len += n->m_len; 6937 } 6938 6939 *errorp = 0; 6940 return (m); 6941 } 6942 6943 /* 6944 * SADB_DUMP processing 6945 * dump all entries including status of DEAD in SAD. 6946 * receive 6947 * <base> 6948 * from the ikmpd, and dump all secasvar leaves 6949 * and send, 6950 * <base> ..... 6951 * to the ikmpd. 6952 * 6953 * m will always be freed. 6954 */ 6955 static int 6956 key_api_dump(struct socket *so, struct mbuf *m0, 6957 const struct sadb_msghdr *mhp) 6958 { 6959 u_int16_t proto; 6960 u_int8_t satype; 6961 struct mbuf *n; 6962 int s; 6963 int error, len, ok; 6964 6965 /* map satype to proto */ 6966 satype = mhp->msg->sadb_msg_satype; 6967 proto = key_satype2proto(satype); 6968 if (proto == 0) { 6969 IPSECLOG(LOG_DEBUG, "invalid satype is passed.\n"); 6970 return key_senderror(so, m0, EINVAL); 6971 } 6972 6973 /* 6974 * If the requestor has insufficient socket-buffer space 6975 * for the entire chain, nobody gets any response to the DUMP. 6976 * XXX For now, only the requestor ever gets anything. 6977 * Moreover, if the requestor has any space at all, they receive 6978 * the entire chain, otherwise the request is refused with ENOBUFS. 6979 */ 6980 if (sbspace(&so->so_rcv) <= 0) { 6981 return key_senderror(so, m0, ENOBUFS); 6982 } 6983 6984 s = splsoftnet(); 6985 n = key_setdump_chain(satype, &error, &len, mhp->msg->sadb_msg_pid); 6986 splx(s); 6987 6988 if (n == NULL) { 6989 return key_senderror(so, m0, ENOENT); 6990 } 6991 { 6992 uint64_t *ps = PFKEY_STAT_GETREF(); 6993 ps[PFKEY_STAT_IN_TOTAL]++; 6994 ps[PFKEY_STAT_IN_BYTES] += len; 6995 PFKEY_STAT_PUTREF(); 6996 } 6997 6998 /* 6999 * PF_KEY DUMP responses are no longer broadcast to all PF_KEY sockets. 7000 * The requestor receives either the entire chain, or an 7001 * error message with ENOBUFS. 7002 * 7003 * sbappendaddrchain() takes the chain of entries, one 7004 * packet-record per SPD entry, prepends the key_src sockaddr 7005 * to each packet-record, links the sockaddr mbufs into a new 7006 * list of records, then appends the entire resulting 7007 * list to the requesting socket. 7008 */ 7009 ok = sbappendaddrchain(&so->so_rcv, (struct sockaddr *)&key_src, n, 7010 SB_PRIO_ONESHOT_OVERFLOW); 7011 7012 if (!ok) { 7013 PFKEY_STATINC(PFKEY_STAT_IN_NOMEM); 7014 m_freem(n); 7015 return key_senderror(so, m0, ENOBUFS); 7016 } 7017 7018 m_freem(m0); 7019 return 0; 7020 } 7021 7022 /* 7023 * SADB_X_PROMISC processing 7024 * 7025 * m will always be freed. 7026 */ 7027 static int 7028 key_api_promisc(struct socket *so, struct mbuf *m, 7029 const struct sadb_msghdr *mhp) 7030 { 7031 int olen; 7032 7033 olen = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7034 7035 if (olen < sizeof(struct sadb_msg)) { 7036 #if 1 7037 return key_senderror(so, m, EINVAL); 7038 #else 7039 m_freem(m); 7040 return 0; 7041 #endif 7042 } else if (olen == sizeof(struct sadb_msg)) { 7043 /* enable/disable promisc mode */ 7044 struct keycb *kp = (struct keycb *)sotorawcb(so); 7045 if (kp == NULL) 7046 return key_senderror(so, m, EINVAL); 7047 mhp->msg->sadb_msg_errno = 0; 7048 switch (mhp->msg->sadb_msg_satype) { 7049 case 0: 7050 case 1: 7051 kp->kp_promisc = mhp->msg->sadb_msg_satype; 7052 break; 7053 default: 7054 return key_senderror(so, m, EINVAL); 7055 } 7056 7057 /* send the original message back to everyone */ 7058 mhp->msg->sadb_msg_errno = 0; 7059 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7060 } else { 7061 /* send packet as is */ 7062 7063 m_adj(m, PFKEY_ALIGN8(sizeof(struct sadb_msg))); 7064 7065 /* TODO: if sadb_msg_seq is specified, send to specific pid */ 7066 return key_sendup_mbuf(so, m, KEY_SENDUP_ALL); 7067 } 7068 } 7069 7070 static int (*key_api_typesw[]) (struct socket *, struct mbuf *, 7071 const struct sadb_msghdr *) = { 7072 NULL, /* SADB_RESERVED */ 7073 key_api_getspi, /* SADB_GETSPI */ 7074 key_api_update, /* SADB_UPDATE */ 7075 key_api_add, /* SADB_ADD */ 7076 key_api_delete, /* SADB_DELETE */ 7077 key_api_get, /* SADB_GET */ 7078 key_api_acquire, /* SADB_ACQUIRE */ 7079 key_api_register, /* SADB_REGISTER */ 7080 NULL, /* SADB_EXPIRE */ 7081 key_api_flush, /* SADB_FLUSH */ 7082 key_api_dump, /* SADB_DUMP */ 7083 key_api_promisc, /* SADB_X_PROMISC */ 7084 NULL, /* SADB_X_PCHANGE */ 7085 key_api_spdadd, /* SADB_X_SPDUPDATE */ 7086 key_api_spdadd, /* SADB_X_SPDADD */ 7087 key_api_spddelete, /* SADB_X_SPDDELETE */ 7088 key_api_spdget, /* SADB_X_SPDGET */ 7089 NULL, /* SADB_X_SPDACQUIRE */ 7090 key_api_spddump, /* SADB_X_SPDDUMP */ 7091 key_api_spdflush, /* SADB_X_SPDFLUSH */ 7092 key_api_spdadd, /* SADB_X_SPDSETIDX */ 7093 NULL, /* SADB_X_SPDEXPIRE */ 7094 key_api_spddelete2, /* SADB_X_SPDDELETE2 */ 7095 key_api_nat_map, /* SADB_X_NAT_T_NEW_MAPPING */ 7096 }; 7097 7098 /* 7099 * parse sadb_msg buffer to process PFKEYv2, 7100 * and create a data to response if needed. 7101 * I think to be dealed with mbuf directly. 7102 * IN: 7103 * msgp : pointer to pointer to a received buffer pulluped. 7104 * This is rewrited to response. 7105 * so : pointer to socket. 7106 * OUT: 7107 * length for buffer to send to user process. 7108 */ 7109 int 7110 key_parse(struct mbuf *m, struct socket *so) 7111 { 7112 struct sadb_msg *msg; 7113 struct sadb_msghdr mh; 7114 u_int orglen; 7115 int error; 7116 7117 KASSERT(m != NULL); 7118 KASSERT(so != NULL); 7119 7120 #if 0 /*kdebug_sadb assumes msg in linear buffer*/ 7121 if (KEYDEBUG_ON(KEYDEBUG_KEY_DUMP)) { 7122 IPSECLOG(LOG_DEBUG, "passed sadb_msg\n"); 7123 kdebug_sadb(msg); 7124 } 7125 #endif 7126 7127 if (m->m_len < sizeof(struct sadb_msg)) { 7128 m = m_pullup(m, sizeof(struct sadb_msg)); 7129 if (!m) 7130 return ENOBUFS; 7131 } 7132 msg = mtod(m, struct sadb_msg *); 7133 orglen = PFKEY_UNUNIT64(msg->sadb_msg_len); 7134 7135 if ((m->m_flags & M_PKTHDR) == 0 || 7136 m->m_pkthdr.len != orglen) { 7137 IPSECLOG(LOG_DEBUG, "invalid message length.\n"); 7138 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7139 error = EINVAL; 7140 goto senderror; 7141 } 7142 7143 if (msg->sadb_msg_version != PF_KEY_V2) { 7144 IPSECLOG(LOG_DEBUG, "PF_KEY version %u is mismatched.\n", 7145 msg->sadb_msg_version); 7146 PFKEY_STATINC(PFKEY_STAT_OUT_INVVER); 7147 error = EINVAL; 7148 goto senderror; 7149 } 7150 7151 if (msg->sadb_msg_type > SADB_MAX) { 7152 IPSECLOG(LOG_DEBUG, "invalid type %u is passed.\n", 7153 msg->sadb_msg_type); 7154 PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); 7155 error = EINVAL; 7156 goto senderror; 7157 } 7158 7159 /* for old-fashioned code - should be nuked */ 7160 if (m->m_pkthdr.len > MCLBYTES) { 7161 m_freem(m); 7162 return ENOBUFS; 7163 } 7164 if (m->m_next) { 7165 struct mbuf *n; 7166 7167 MGETHDR(n, M_DONTWAIT, MT_DATA); 7168 if (n && m->m_pkthdr.len > MHLEN) { 7169 MCLGET(n, M_DONTWAIT); 7170 if ((n->m_flags & M_EXT) == 0) { 7171 m_free(n); 7172 n = NULL; 7173 } 7174 } 7175 if (!n) { 7176 m_freem(m); 7177 return ENOBUFS; 7178 } 7179 m_copydata(m, 0, m->m_pkthdr.len, mtod(n, void *)); 7180 n->m_pkthdr.len = n->m_len = m->m_pkthdr.len; 7181 n->m_next = NULL; 7182 m_freem(m); 7183 m = n; 7184 } 7185 7186 /* align the mbuf chain so that extensions are in contiguous region. */ 7187 error = key_align(m, &mh); 7188 if (error) 7189 return error; 7190 7191 if (m->m_next) { /*XXX*/ 7192 m_freem(m); 7193 return ENOBUFS; 7194 } 7195 7196 msg = mh.msg; 7197 7198 /* check SA type */ 7199 switch (msg->sadb_msg_satype) { 7200 case SADB_SATYPE_UNSPEC: 7201 switch (msg->sadb_msg_type) { 7202 case SADB_GETSPI: 7203 case SADB_UPDATE: 7204 case SADB_ADD: 7205 case SADB_DELETE: 7206 case SADB_GET: 7207 case SADB_ACQUIRE: 7208 case SADB_EXPIRE: 7209 IPSECLOG(LOG_DEBUG, 7210 "must specify satype when msg type=%u.\n", 7211 msg->sadb_msg_type); 7212 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7213 error = EINVAL; 7214 goto senderror; 7215 } 7216 break; 7217 case SADB_SATYPE_AH: 7218 case SADB_SATYPE_ESP: 7219 case SADB_X_SATYPE_IPCOMP: 7220 case SADB_X_SATYPE_TCPSIGNATURE: 7221 switch (msg->sadb_msg_type) { 7222 case SADB_X_SPDADD: 7223 case SADB_X_SPDDELETE: 7224 case SADB_X_SPDGET: 7225 case SADB_X_SPDDUMP: 7226 case SADB_X_SPDFLUSH: 7227 case SADB_X_SPDSETIDX: 7228 case SADB_X_SPDUPDATE: 7229 case SADB_X_SPDDELETE2: 7230 IPSECLOG(LOG_DEBUG, "illegal satype=%u\n", 7231 msg->sadb_msg_type); 7232 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7233 error = EINVAL; 7234 goto senderror; 7235 } 7236 break; 7237 case SADB_SATYPE_RSVP: 7238 case SADB_SATYPE_OSPFV2: 7239 case SADB_SATYPE_RIPV2: 7240 case SADB_SATYPE_MIP: 7241 IPSECLOG(LOG_DEBUG, "type %u isn't supported.\n", 7242 msg->sadb_msg_satype); 7243 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7244 error = EOPNOTSUPP; 7245 goto senderror; 7246 case 1: /* XXX: What does it do? */ 7247 if (msg->sadb_msg_type == SADB_X_PROMISC) 7248 break; 7249 /*FALLTHROUGH*/ 7250 default: 7251 IPSECLOG(LOG_DEBUG, "invalid type %u is passed.\n", 7252 msg->sadb_msg_satype); 7253 PFKEY_STATINC(PFKEY_STAT_OUT_INVSATYPE); 7254 error = EINVAL; 7255 goto senderror; 7256 } 7257 7258 /* check field of upper layer protocol and address family */ 7259 if (mh.ext[SADB_EXT_ADDRESS_SRC] != NULL && 7260 mh.ext[SADB_EXT_ADDRESS_DST] != NULL) { 7261 struct sadb_address *src0, *dst0; 7262 u_int plen; 7263 7264 src0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_SRC]); 7265 dst0 = (struct sadb_address *)(mh.ext[SADB_EXT_ADDRESS_DST]); 7266 7267 /* check upper layer protocol */ 7268 if (src0->sadb_address_proto != dst0->sadb_address_proto) { 7269 IPSECLOG(LOG_DEBUG, "upper layer protocol mismatched.\n"); 7270 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7271 error = EINVAL; 7272 goto senderror; 7273 } 7274 7275 /* check family */ 7276 if (PFKEY_ADDR_SADDR(src0)->sa_family != 7277 PFKEY_ADDR_SADDR(dst0)->sa_family) { 7278 IPSECLOG(LOG_DEBUG, "address family mismatched.\n"); 7279 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7280 error = EINVAL; 7281 goto senderror; 7282 } 7283 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7284 PFKEY_ADDR_SADDR(dst0)->sa_len) { 7285 IPSECLOG(LOG_DEBUG, 7286 "address struct size mismatched.\n"); 7287 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7288 error = EINVAL; 7289 goto senderror; 7290 } 7291 7292 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7293 case AF_INET: 7294 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7295 sizeof(struct sockaddr_in)) { 7296 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7297 error = EINVAL; 7298 goto senderror; 7299 } 7300 break; 7301 case AF_INET6: 7302 if (PFKEY_ADDR_SADDR(src0)->sa_len != 7303 sizeof(struct sockaddr_in6)) { 7304 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7305 error = EINVAL; 7306 goto senderror; 7307 } 7308 break; 7309 default: 7310 IPSECLOG(LOG_DEBUG, "unsupported address family.\n"); 7311 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7312 error = EAFNOSUPPORT; 7313 goto senderror; 7314 } 7315 7316 switch (PFKEY_ADDR_SADDR(src0)->sa_family) { 7317 case AF_INET: 7318 plen = sizeof(struct in_addr) << 3; 7319 break; 7320 case AF_INET6: 7321 plen = sizeof(struct in6_addr) << 3; 7322 break; 7323 default: 7324 plen = 0; /*fool gcc*/ 7325 break; 7326 } 7327 7328 /* check max prefix length */ 7329 if (src0->sadb_address_prefixlen > plen || 7330 dst0->sadb_address_prefixlen > plen) { 7331 IPSECLOG(LOG_DEBUG, "illegal prefixlen.\n"); 7332 PFKEY_STATINC(PFKEY_STAT_OUT_INVADDR); 7333 error = EINVAL; 7334 goto senderror; 7335 } 7336 7337 /* 7338 * prefixlen == 0 is valid because there can be a case when 7339 * all addresses are matched. 7340 */ 7341 } 7342 7343 if (msg->sadb_msg_type >= __arraycount(key_api_typesw) || 7344 key_api_typesw[msg->sadb_msg_type] == NULL) { 7345 PFKEY_STATINC(PFKEY_STAT_OUT_INVMSGTYPE); 7346 error = EINVAL; 7347 goto senderror; 7348 } 7349 7350 return (*key_api_typesw[msg->sadb_msg_type])(so, m, &mh); 7351 7352 senderror: 7353 return key_senderror(so, m, error); 7354 } 7355 7356 static int 7357 key_senderror(struct socket *so, struct mbuf *m, int code) 7358 { 7359 struct sadb_msg *msg; 7360 7361 KASSERT(m->m_len >= sizeof(struct sadb_msg)); 7362 7363 msg = mtod(m, struct sadb_msg *); 7364 msg->sadb_msg_errno = code; 7365 return key_sendup_mbuf(so, m, KEY_SENDUP_ONE); 7366 } 7367 7368 /* 7369 * set the pointer to each header into message buffer. 7370 * m will be freed on error. 7371 * XXX larger-than-MCLBYTES extension? 7372 */ 7373 static int 7374 key_align(struct mbuf *m, struct sadb_msghdr *mhp) 7375 { 7376 struct mbuf *n; 7377 struct sadb_ext *ext; 7378 size_t off, end; 7379 int extlen; 7380 int toff; 7381 7382 KASSERT(m != NULL); 7383 KASSERT(mhp != NULL); 7384 KASSERT(m->m_len >= sizeof(struct sadb_msg)); 7385 7386 /* initialize */ 7387 memset(mhp, 0, sizeof(*mhp)); 7388 7389 mhp->msg = mtod(m, struct sadb_msg *); 7390 mhp->ext[0] = (struct sadb_ext *)mhp->msg; /*XXX backward compat */ 7391 7392 end = PFKEY_UNUNIT64(mhp->msg->sadb_msg_len); 7393 extlen = end; /*just in case extlen is not updated*/ 7394 for (off = sizeof(struct sadb_msg); off < end; off += extlen) { 7395 n = m_pulldown(m, off, sizeof(struct sadb_ext), &toff); 7396 if (!n) { 7397 /* m is already freed */ 7398 return ENOBUFS; 7399 } 7400 ext = (struct sadb_ext *)(mtod(n, char *) + toff); 7401 7402 /* set pointer */ 7403 switch (ext->sadb_ext_type) { 7404 case SADB_EXT_SA: 7405 case SADB_EXT_ADDRESS_SRC: 7406 case SADB_EXT_ADDRESS_DST: 7407 case SADB_EXT_ADDRESS_PROXY: 7408 case SADB_EXT_LIFETIME_CURRENT: 7409 case SADB_EXT_LIFETIME_HARD: 7410 case SADB_EXT_LIFETIME_SOFT: 7411 case SADB_EXT_KEY_AUTH: 7412 case SADB_EXT_KEY_ENCRYPT: 7413 case SADB_EXT_IDENTITY_SRC: 7414 case SADB_EXT_IDENTITY_DST: 7415 case SADB_EXT_SENSITIVITY: 7416 case SADB_EXT_PROPOSAL: 7417 case SADB_EXT_SUPPORTED_AUTH: 7418 case SADB_EXT_SUPPORTED_ENCRYPT: 7419 case SADB_EXT_SPIRANGE: 7420 case SADB_X_EXT_POLICY: 7421 case SADB_X_EXT_SA2: 7422 case SADB_X_EXT_NAT_T_TYPE: 7423 case SADB_X_EXT_NAT_T_SPORT: 7424 case SADB_X_EXT_NAT_T_DPORT: 7425 case SADB_X_EXT_NAT_T_OAI: 7426 case SADB_X_EXT_NAT_T_OAR: 7427 case SADB_X_EXT_NAT_T_FRAG: 7428 /* duplicate check */ 7429 /* 7430 * XXX Are there duplication payloads of either 7431 * KEY_AUTH or KEY_ENCRYPT ? 7432 */ 7433 if (mhp->ext[ext->sadb_ext_type] != NULL) { 7434 IPSECLOG(LOG_DEBUG, 7435 "duplicate ext_type %u is passed.\n", 7436 ext->sadb_ext_type); 7437 m_freem(m); 7438 PFKEY_STATINC(PFKEY_STAT_OUT_DUPEXT); 7439 return EINVAL; 7440 } 7441 break; 7442 default: 7443 IPSECLOG(LOG_DEBUG, "invalid ext_type %u is passed.\n", 7444 ext->sadb_ext_type); 7445 m_freem(m); 7446 PFKEY_STATINC(PFKEY_STAT_OUT_INVEXTTYPE); 7447 return EINVAL; 7448 } 7449 7450 extlen = PFKEY_UNUNIT64(ext->sadb_ext_len); 7451 7452 if (key_validate_ext(ext, extlen)) { 7453 m_freem(m); 7454 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7455 return EINVAL; 7456 } 7457 7458 n = m_pulldown(m, off, extlen, &toff); 7459 if (!n) { 7460 /* m is already freed */ 7461 return ENOBUFS; 7462 } 7463 ext = (struct sadb_ext *)(mtod(n, char *) + toff); 7464 7465 mhp->ext[ext->sadb_ext_type] = ext; 7466 mhp->extoff[ext->sadb_ext_type] = off; 7467 mhp->extlen[ext->sadb_ext_type] = extlen; 7468 } 7469 7470 if (off != end) { 7471 m_freem(m); 7472 PFKEY_STATINC(PFKEY_STAT_OUT_INVLEN); 7473 return EINVAL; 7474 } 7475 7476 return 0; 7477 } 7478 7479 static int 7480 key_validate_ext(const struct sadb_ext *ext, int len) 7481 { 7482 const struct sockaddr *sa; 7483 enum { NONE, ADDR } checktype = NONE; 7484 int baselen = 0; 7485 const int sal = offsetof(struct sockaddr, sa_len) + sizeof(sa->sa_len); 7486 7487 if (len != PFKEY_UNUNIT64(ext->sadb_ext_len)) 7488 return EINVAL; 7489 7490 /* if it does not match minimum/maximum length, bail */ 7491 if (ext->sadb_ext_type >= __arraycount(minsize) || 7492 ext->sadb_ext_type >= __arraycount(maxsize)) 7493 return EINVAL; 7494 if (!minsize[ext->sadb_ext_type] || len < minsize[ext->sadb_ext_type]) 7495 return EINVAL; 7496 if (maxsize[ext->sadb_ext_type] && len > maxsize[ext->sadb_ext_type]) 7497 return EINVAL; 7498 7499 /* more checks based on sadb_ext_type XXX need more */ 7500 switch (ext->sadb_ext_type) { 7501 case SADB_EXT_ADDRESS_SRC: 7502 case SADB_EXT_ADDRESS_DST: 7503 case SADB_EXT_ADDRESS_PROXY: 7504 baselen = PFKEY_ALIGN8(sizeof(struct sadb_address)); 7505 checktype = ADDR; 7506 break; 7507 case SADB_EXT_IDENTITY_SRC: 7508 case SADB_EXT_IDENTITY_DST: 7509 if (((const struct sadb_ident *)ext)->sadb_ident_type == 7510 SADB_X_IDENTTYPE_ADDR) { 7511 baselen = PFKEY_ALIGN8(sizeof(struct sadb_ident)); 7512 checktype = ADDR; 7513 } else 7514 checktype = NONE; 7515 break; 7516 default: 7517 checktype = NONE; 7518 break; 7519 } 7520 7521 switch (checktype) { 7522 case NONE: 7523 break; 7524 case ADDR: 7525 sa = (const struct sockaddr *)(((const u_int8_t*)ext)+baselen); 7526 if (len < baselen + sal) 7527 return EINVAL; 7528 if (baselen + PFKEY_ALIGN8(sa->sa_len) != len) 7529 return EINVAL; 7530 break; 7531 } 7532 7533 return 0; 7534 } 7535 7536 static int 7537 key_do_init(void) 7538 { 7539 int i, error; 7540 7541 mutex_init(&key_mtx, MUTEX_DEFAULT, IPL_NONE); 7542 7543 pfkeystat_percpu = percpu_alloc(sizeof(uint64_t) * PFKEY_NSTATS); 7544 7545 callout_init(&key_timehandler_ch, 0); 7546 error = workqueue_create(&key_timehandler_wq, "key_timehandler", 7547 key_timehandler_work, NULL, PRI_SOFTNET, IPL_SOFTNET, WQ_MPSAFE); 7548 if (error != 0) 7549 panic("%s: workqueue_create failed (%d)\n", __func__, error); 7550 7551 for (i = 0; i < IPSEC_DIR_MAX; i++) { 7552 PSLIST_INIT(&sptree[i]); 7553 } 7554 7555 LIST_INIT(&sahtree); 7556 7557 for (i = 0; i <= SADB_SATYPE_MAX; i++) { 7558 LIST_INIT(®tree[i]); 7559 } 7560 7561 #ifndef IPSEC_NONBLOCK_ACQUIRE 7562 LIST_INIT(&acqtree); 7563 #endif 7564 #ifdef notyet 7565 LIST_INIT(&spacqtree); 7566 #endif 7567 7568 /* system default */ 7569 ip4_def_policy.policy = IPSEC_POLICY_NONE; 7570 ip4_def_policy.refcnt++; /*never reclaim this*/ 7571 7572 #ifdef INET6 7573 ip6_def_policy.policy = IPSEC_POLICY_NONE; 7574 ip6_def_policy.refcnt++; /*never reclaim this*/ 7575 #endif 7576 7577 callout_reset(&key_timehandler_ch, hz, key_timehandler, NULL); 7578 7579 /* initialize key statistics */ 7580 keystat.getspi_count = 1; 7581 7582 aprint_verbose("IPsec: Initialized Security Association Processing.\n"); 7583 7584 return (0); 7585 } 7586 7587 void 7588 key_init(void) 7589 { 7590 static ONCE_DECL(key_init_once); 7591 7592 sysctl_net_keyv2_setup(NULL); 7593 sysctl_net_key_compat_setup(NULL); 7594 7595 RUN_ONCE(&key_init_once, key_do_init); 7596 } 7597 7598 /* 7599 * XXX: maybe This function is called after INBOUND IPsec processing. 7600 * 7601 * Special check for tunnel-mode packets. 7602 * We must make some checks for consistency between inner and outer IP header. 7603 * 7604 * xxx more checks to be provided 7605 */ 7606 int 7607 key_checktunnelsanity( 7608 struct secasvar *sav, 7609 u_int family, 7610 void *src, 7611 void *dst 7612 ) 7613 { 7614 7615 /* XXX: check inner IP header */ 7616 7617 return 1; 7618 } 7619 7620 #if 0 7621 #define hostnamelen strlen(hostname) 7622 7623 /* 7624 * Get FQDN for the host. 7625 * If the administrator configured hostname (by hostname(1)) without 7626 * domain name, returns nothing. 7627 */ 7628 static const char * 7629 key_getfqdn(void) 7630 { 7631 int i; 7632 int hasdot; 7633 static char fqdn[MAXHOSTNAMELEN + 1]; 7634 7635 if (!hostnamelen) 7636 return NULL; 7637 7638 /* check if it comes with domain name. */ 7639 hasdot = 0; 7640 for (i = 0; i < hostnamelen; i++) { 7641 if (hostname[i] == '.') 7642 hasdot++; 7643 } 7644 if (!hasdot) 7645 return NULL; 7646 7647 /* NOTE: hostname may not be NUL-terminated. */ 7648 memset(fqdn, 0, sizeof(fqdn)); 7649 memcpy(fqdn, hostname, hostnamelen); 7650 fqdn[hostnamelen] = '\0'; 7651 return fqdn; 7652 } 7653 7654 /* 7655 * get username@FQDN for the host/user. 7656 */ 7657 static const char * 7658 key_getuserfqdn(void) 7659 { 7660 const char *host; 7661 static char userfqdn[MAXHOSTNAMELEN + MAXLOGNAME + 2]; 7662 struct proc *p = curproc; 7663 char *q; 7664 7665 if (!p || !p->p_pgrp || !p->p_pgrp->pg_session) 7666 return NULL; 7667 if (!(host = key_getfqdn())) 7668 return NULL; 7669 7670 /* NOTE: s_login may not be-NUL terminated. */ 7671 memset(userfqdn, 0, sizeof(userfqdn)); 7672 memcpy(userfqdn, Mp->p_pgrp->pg_session->s_login, AXLOGNAME); 7673 userfqdn[MAXLOGNAME] = '\0'; /* safeguard */ 7674 q = userfqdn + strlen(userfqdn); 7675 *q++ = '@'; 7676 memcpy(q, host, strlen(host)); 7677 q += strlen(host); 7678 *q++ = '\0'; 7679 7680 return userfqdn; 7681 } 7682 #endif 7683 7684 /* record data transfer on SA, and update timestamps */ 7685 void 7686 key_sa_recordxfer(struct secasvar *sav, struct mbuf *m) 7687 { 7688 7689 KASSERT(sav != NULL); 7690 KASSERT(sav->lft_c != NULL); 7691 KASSERT(m != NULL); 7692 7693 /* 7694 * XXX Currently, there is a difference of bytes size 7695 * between inbound and outbound processing. 7696 */ 7697 sav->lft_c->sadb_lifetime_bytes += m->m_pkthdr.len; 7698 /* to check bytes lifetime is done in key_timehandler(). */ 7699 7700 /* 7701 * We use the number of packets as the unit of 7702 * sadb_lifetime_allocations. We increment the variable 7703 * whenever {esp,ah}_{in,out}put is called. 7704 */ 7705 sav->lft_c->sadb_lifetime_allocations++; 7706 /* XXX check for expires? */ 7707 7708 /* 7709 * NOTE: We record CURRENT sadb_lifetime_usetime by using wall clock, 7710 * in seconds. HARD and SOFT lifetime are measured by the time 7711 * difference (again in seconds) from sadb_lifetime_usetime. 7712 * 7713 * usetime 7714 * v expire expire 7715 * -----+-----+--------+---> t 7716 * <--------------> HARD 7717 * <-----> SOFT 7718 */ 7719 sav->lft_c->sadb_lifetime_usetime = time_uptime; 7720 /* XXX check for expires? */ 7721 7722 return; 7723 } 7724 7725 /* dumb version */ 7726 void 7727 key_sa_routechange(struct sockaddr *dst) 7728 { 7729 struct secashead *sah; 7730 struct route *ro; 7731 const struct sockaddr *sa; 7732 7733 LIST_FOREACH(sah, &sahtree, chain) { 7734 ro = &sah->sa_route; 7735 sa = rtcache_getdst(ro); 7736 if (sa != NULL && dst->sa_len == sa->sa_len && 7737 memcmp(dst, sa, dst->sa_len) == 0) 7738 rtcache_free(ro); 7739 } 7740 7741 return; 7742 } 7743 7744 static void 7745 key_sa_chgstate(struct secasvar *sav, u_int8_t state) 7746 { 7747 struct secasvar *_sav; 7748 7749 KASSERT(sav != NULL); 7750 7751 if (sav->state == state) 7752 return; 7753 7754 KASSERT(__LIST_CHAINED(sav)); 7755 LIST_REMOVE(sav, chain); 7756 7757 sav->state = state; 7758 if (!SADB_SASTATE_USABLE_P(sav)) { 7759 /* We don't need to care about the order */ 7760 LIST_INSERT_HEAD(&sav->sah->savtree[state], sav, chain); 7761 return; 7762 } 7763 /* 7764 * Sort the list by lft_c->sadb_lifetime_addtime 7765 * in ascending order. 7766 */ 7767 LIST_FOREACH(_sav, &sav->sah->savtree[state], chain) { 7768 if (_sav->lft_c->sadb_lifetime_addtime > 7769 sav->lft_c->sadb_lifetime_addtime) { 7770 LIST_INSERT_BEFORE(_sav, sav, chain); 7771 break; 7772 } 7773 } 7774 if (_sav == NULL) { 7775 LIST_INSERT_TAIL(&sav->sah->savtree[state], sav, secasvar, 7776 chain); 7777 } 7778 key_validate_savlist(sav->sah, state); 7779 } 7780 7781 /* XXX too much? */ 7782 static struct mbuf * 7783 key_alloc_mbuf(int l) 7784 { 7785 struct mbuf *m = NULL, *n; 7786 int len, t; 7787 7788 len = l; 7789 while (len > 0) { 7790 MGET(n, M_DONTWAIT, MT_DATA); 7791 if (n && len > MLEN) 7792 MCLGET(n, M_DONTWAIT); 7793 if (!n) { 7794 m_freem(m); 7795 return NULL; 7796 } 7797 7798 n->m_next = NULL; 7799 n->m_len = 0; 7800 n->m_len = M_TRAILINGSPACE(n); 7801 /* use the bottom of mbuf, hoping we can prepend afterwards */ 7802 if (n->m_len > len) { 7803 t = (n->m_len - len) & ~(sizeof(long) - 1); 7804 n->m_data += t; 7805 n->m_len = len; 7806 } 7807 7808 len -= n->m_len; 7809 7810 if (m) 7811 m_cat(m, n); 7812 else 7813 m = n; 7814 } 7815 7816 return m; 7817 } 7818 7819 static struct mbuf * 7820 key_setdump(u_int8_t req_satype, int *errorp, uint32_t pid) 7821 { 7822 struct secashead *sah; 7823 struct secasvar *sav; 7824 u_int16_t proto; 7825 u_int8_t satype; 7826 u_int8_t state; 7827 int cnt; 7828 struct mbuf *m, *n; 7829 7830 /* map satype to proto */ 7831 proto = key_satype2proto(req_satype); 7832 if (proto == 0) { 7833 *errorp = EINVAL; 7834 return (NULL); 7835 } 7836 7837 /* count sav entries to be sent to the userland. */ 7838 cnt = 0; 7839 LIST_FOREACH(sah, &sahtree, chain) { 7840 if (req_satype != SADB_SATYPE_UNSPEC && 7841 proto != sah->saidx.proto) 7842 continue; 7843 7844 SASTATE_ANY_FOREACH(state) { 7845 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7846 cnt++; 7847 } 7848 } 7849 } 7850 7851 if (cnt == 0) { 7852 *errorp = ENOENT; 7853 return (NULL); 7854 } 7855 7856 /* send this to the userland, one at a time. */ 7857 m = NULL; 7858 LIST_FOREACH(sah, &sahtree, chain) { 7859 if (req_satype != SADB_SATYPE_UNSPEC && 7860 proto != sah->saidx.proto) 7861 continue; 7862 7863 /* map proto to satype */ 7864 satype = key_proto2satype(sah->saidx.proto); 7865 if (satype == 0) { 7866 m_freem(m); 7867 *errorp = EINVAL; 7868 return (NULL); 7869 } 7870 7871 SASTATE_ANY_FOREACH(state) { 7872 LIST_FOREACH(sav, &sah->savtree[state], chain) { 7873 n = key_setdumpsa(sav, SADB_DUMP, satype, 7874 --cnt, pid); 7875 if (!n) { 7876 m_freem(m); 7877 *errorp = ENOBUFS; 7878 return (NULL); 7879 } 7880 7881 if (!m) 7882 m = n; 7883 else 7884 m_cat(m, n); 7885 } 7886 } 7887 } 7888 7889 if (!m) { 7890 *errorp = EINVAL; 7891 return (NULL); 7892 } 7893 7894 if ((m->m_flags & M_PKTHDR) != 0) { 7895 m->m_pkthdr.len = 0; 7896 for (n = m; n; n = n->m_next) 7897 m->m_pkthdr.len += n->m_len; 7898 } 7899 7900 *errorp = 0; 7901 return (m); 7902 } 7903 7904 static struct mbuf * 7905 key_setspddump(int *errorp, pid_t pid) 7906 { 7907 struct secpolicy *sp; 7908 int cnt; 7909 u_int dir; 7910 struct mbuf *m, *n; 7911 7912 /* search SPD entry and get buffer size. */ 7913 cnt = 0; 7914 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 7915 SPLIST_READER_FOREACH(sp, dir) { 7916 cnt++; 7917 } 7918 } 7919 7920 if (cnt == 0) { 7921 *errorp = ENOENT; 7922 return (NULL); 7923 } 7924 7925 m = NULL; 7926 for (dir = 0; dir < IPSEC_DIR_MAX; dir++) { 7927 SPLIST_READER_FOREACH(sp, dir) { 7928 --cnt; 7929 n = key_setdumpsp(sp, SADB_X_SPDDUMP, cnt, pid); 7930 7931 if (!n) { 7932 *errorp = ENOBUFS; 7933 m_freem(m); 7934 return (NULL); 7935 } 7936 if (!m) 7937 m = n; 7938 else { 7939 m->m_pkthdr.len += n->m_pkthdr.len; 7940 m_cat(m, n); 7941 } 7942 } 7943 } 7944 7945 *errorp = 0; 7946 return (m); 7947 } 7948 7949 int 7950 key_get_used(void) { 7951 return !SPLIST_READER_EMPTY(IPSEC_DIR_INBOUND) || 7952 !SPLIST_READER_EMPTY(IPSEC_DIR_OUTBOUND); 7953 } 7954 7955 void 7956 key_update_used(void) 7957 { 7958 switch (ipsec_enabled) { 7959 default: 7960 case 0: 7961 #ifdef notyet 7962 /* XXX: racy */ 7963 ipsec_used = 0; 7964 #endif 7965 break; 7966 case 1: 7967 #ifndef notyet 7968 /* XXX: racy */ 7969 if (!ipsec_used) 7970 #endif 7971 ipsec_used = key_get_used(); 7972 break; 7973 case 2: 7974 ipsec_used = 1; 7975 break; 7976 } 7977 } 7978 7979 static int 7980 sysctl_net_key_dumpsa(SYSCTLFN_ARGS) 7981 { 7982 struct mbuf *m, *n; 7983 int err2 = 0; 7984 char *p, *ep; 7985 size_t len; 7986 int s, error; 7987 7988 if (newp) 7989 return (EPERM); 7990 if (namelen != 1) 7991 return (EINVAL); 7992 7993 s = splsoftnet(); 7994 m = key_setdump(name[0], &error, l->l_proc->p_pid); 7995 splx(s); 7996 if (!m) 7997 return (error); 7998 if (!oldp) 7999 *oldlenp = m->m_pkthdr.len; 8000 else { 8001 p = oldp; 8002 if (*oldlenp < m->m_pkthdr.len) { 8003 err2 = ENOMEM; 8004 ep = p + *oldlenp; 8005 } else { 8006 *oldlenp = m->m_pkthdr.len; 8007 ep = p + m->m_pkthdr.len; 8008 } 8009 for (n = m; n; n = n->m_next) { 8010 len = (ep - p < n->m_len) ? 8011 ep - p : n->m_len; 8012 error = copyout(mtod(n, const void *), p, len); 8013 p += len; 8014 if (error) 8015 break; 8016 } 8017 if (error == 0) 8018 error = err2; 8019 } 8020 m_freem(m); 8021 8022 return (error); 8023 } 8024 8025 static int 8026 sysctl_net_key_dumpsp(SYSCTLFN_ARGS) 8027 { 8028 struct mbuf *m, *n; 8029 int err2 = 0; 8030 char *p, *ep; 8031 size_t len; 8032 int s, error; 8033 8034 if (newp) 8035 return (EPERM); 8036 if (namelen != 0) 8037 return (EINVAL); 8038 8039 s = splsoftnet(); 8040 m = key_setspddump(&error, l->l_proc->p_pid); 8041 splx(s); 8042 if (!m) 8043 return (error); 8044 if (!oldp) 8045 *oldlenp = m->m_pkthdr.len; 8046 else { 8047 p = oldp; 8048 if (*oldlenp < m->m_pkthdr.len) { 8049 err2 = ENOMEM; 8050 ep = p + *oldlenp; 8051 } else { 8052 *oldlenp = m->m_pkthdr.len; 8053 ep = p + m->m_pkthdr.len; 8054 } 8055 for (n = m; n; n = n->m_next) { 8056 len = (ep - p < n->m_len) ? ep - p : n->m_len; 8057 error = copyout(mtod(n, const void *), p, len); 8058 p += len; 8059 if (error) 8060 break; 8061 } 8062 if (error == 0) 8063 error = err2; 8064 } 8065 m_freem(m); 8066 8067 return (error); 8068 } 8069 8070 /* 8071 * Create sysctl tree for native IPSEC key knobs, originally 8072 * under name "net.keyv2" * with MIB number { CTL_NET, PF_KEY_V2. }. 8073 * However, sysctl(8) never checked for nodes under { CTL_NET, PF_KEY_V2 }; 8074 * and in any case the part of our sysctl namespace used for dumping the 8075 * SPD and SA database *HAS* to be compatible with the KAME sysctl 8076 * namespace, for API reasons. 8077 * 8078 * Pending a consensus on the right way to fix this, add a level of 8079 * indirection in how we number the `native' IPSEC key nodes; 8080 * and (as requested by Andrew Brown) move registration of the 8081 * KAME-compatible names to a separate function. 8082 */ 8083 #if 0 8084 # define IPSEC_PFKEY PF_KEY_V2 8085 # define IPSEC_PFKEY_NAME "keyv2" 8086 #else 8087 # define IPSEC_PFKEY PF_KEY 8088 # define IPSEC_PFKEY_NAME "key" 8089 #endif 8090 8091 static int 8092 sysctl_net_key_stats(SYSCTLFN_ARGS) 8093 { 8094 8095 return (NETSTAT_SYSCTL(pfkeystat_percpu, PFKEY_NSTATS)); 8096 } 8097 8098 static void 8099 sysctl_net_keyv2_setup(struct sysctllog **clog) 8100 { 8101 8102 sysctl_createv(clog, 0, NULL, NULL, 8103 CTLFLAG_PERMANENT, 8104 CTLTYPE_NODE, IPSEC_PFKEY_NAME, NULL, 8105 NULL, 0, NULL, 0, 8106 CTL_NET, IPSEC_PFKEY, CTL_EOL); 8107 8108 sysctl_createv(clog, 0, NULL, NULL, 8109 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8110 CTLTYPE_INT, "debug", NULL, 8111 NULL, 0, &key_debug_level, 0, 8112 CTL_NET, IPSEC_PFKEY, KEYCTL_DEBUG_LEVEL, CTL_EOL); 8113 sysctl_createv(clog, 0, NULL, NULL, 8114 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8115 CTLTYPE_INT, "spi_try", NULL, 8116 NULL, 0, &key_spi_trycnt, 0, 8117 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_TRY, CTL_EOL); 8118 sysctl_createv(clog, 0, NULL, NULL, 8119 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8120 CTLTYPE_INT, "spi_min_value", NULL, 8121 NULL, 0, &key_spi_minval, 0, 8122 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_MIN_VALUE, CTL_EOL); 8123 sysctl_createv(clog, 0, NULL, NULL, 8124 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8125 CTLTYPE_INT, "spi_max_value", NULL, 8126 NULL, 0, &key_spi_maxval, 0, 8127 CTL_NET, IPSEC_PFKEY, KEYCTL_SPI_MAX_VALUE, CTL_EOL); 8128 sysctl_createv(clog, 0, NULL, NULL, 8129 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8130 CTLTYPE_INT, "random_int", NULL, 8131 NULL, 0, &key_int_random, 0, 8132 CTL_NET, IPSEC_PFKEY, KEYCTL_RANDOM_INT, CTL_EOL); 8133 sysctl_createv(clog, 0, NULL, NULL, 8134 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8135 CTLTYPE_INT, "larval_lifetime", NULL, 8136 NULL, 0, &key_larval_lifetime, 0, 8137 CTL_NET, IPSEC_PFKEY, KEYCTL_LARVAL_LIFETIME, CTL_EOL); 8138 sysctl_createv(clog, 0, NULL, NULL, 8139 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8140 CTLTYPE_INT, "blockacq_count", NULL, 8141 NULL, 0, &key_blockacq_count, 0, 8142 CTL_NET, IPSEC_PFKEY, KEYCTL_BLOCKACQ_COUNT, CTL_EOL); 8143 sysctl_createv(clog, 0, NULL, NULL, 8144 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8145 CTLTYPE_INT, "blockacq_lifetime", NULL, 8146 NULL, 0, &key_blockacq_lifetime, 0, 8147 CTL_NET, IPSEC_PFKEY, KEYCTL_BLOCKACQ_LIFETIME, CTL_EOL); 8148 sysctl_createv(clog, 0, NULL, NULL, 8149 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8150 CTLTYPE_INT, "esp_keymin", NULL, 8151 NULL, 0, &ipsec_esp_keymin, 0, 8152 CTL_NET, IPSEC_PFKEY, KEYCTL_ESP_KEYMIN, CTL_EOL); 8153 sysctl_createv(clog, 0, NULL, NULL, 8154 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8155 CTLTYPE_INT, "prefered_oldsa", NULL, 8156 NULL, 0, &key_prefered_oldsa, 0, 8157 CTL_NET, PF_KEY, KEYCTL_PREFERED_OLDSA, CTL_EOL); 8158 sysctl_createv(clog, 0, NULL, NULL, 8159 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8160 CTLTYPE_INT, "esp_auth", NULL, 8161 NULL, 0, &ipsec_esp_auth, 0, 8162 CTL_NET, IPSEC_PFKEY, KEYCTL_ESP_AUTH, CTL_EOL); 8163 sysctl_createv(clog, 0, NULL, NULL, 8164 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 8165 CTLTYPE_INT, "ah_keymin", NULL, 8166 NULL, 0, &ipsec_ah_keymin, 0, 8167 CTL_NET, IPSEC_PFKEY, KEYCTL_AH_KEYMIN, CTL_EOL); 8168 sysctl_createv(clog, 0, NULL, NULL, 8169 CTLFLAG_PERMANENT, 8170 CTLTYPE_STRUCT, "stats", 8171 SYSCTL_DESCR("PF_KEY statistics"), 8172 sysctl_net_key_stats, 0, NULL, 0, 8173 CTL_NET, IPSEC_PFKEY, CTL_CREATE, CTL_EOL); 8174 } 8175 8176 /* 8177 * Register sysctl names used by setkey(8). For historical reasons, 8178 * and to share a single API, these names appear under { CTL_NET, PF_KEY } 8179 * for both IPSEC and KAME IPSEC. 8180 */ 8181 static void 8182 sysctl_net_key_compat_setup(struct sysctllog **clog) 8183 { 8184 8185 sysctl_createv(clog, 0, NULL, NULL, 8186 CTLFLAG_PERMANENT, 8187 CTLTYPE_NODE, "key", NULL, 8188 NULL, 0, NULL, 0, 8189 CTL_NET, PF_KEY, CTL_EOL); 8190 8191 /* Register the net.key.dump{sa,sp} nodes used by setkey(8). */ 8192 sysctl_createv(clog, 0, NULL, NULL, 8193 CTLFLAG_PERMANENT, 8194 CTLTYPE_STRUCT, "dumpsa", NULL, 8195 sysctl_net_key_dumpsa, 0, NULL, 0, 8196 CTL_NET, PF_KEY, KEYCTL_DUMPSA, CTL_EOL); 8197 sysctl_createv(clog, 0, NULL, NULL, 8198 CTLFLAG_PERMANENT, 8199 CTLTYPE_STRUCT, "dumpsp", NULL, 8200 sysctl_net_key_dumpsp, 0, NULL, 0, 8201 CTL_NET, PF_KEY, KEYCTL_DUMPSP, CTL_EOL); 8202 } 8203
Indexes created Tue Sep 23 02:09:52 GMT 2025