1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/stream.h> 30 #include <sys/stropts.h> 31 #include <sys/errno.h> 32 #include <sys/strlog.h> 33 #include <sys/tihdr.h> 34 #include <sys/socket.h> 35 #include <sys/ddi.h> 36 #include <sys/sunddi.h> 37 #include <sys/kmem.h> 38 #include <sys/zone.h> 39 #include <sys/sysmacros.h> 40 #include <sys/cmn_err.h> 41 #include <sys/vtrace.h> 42 #include <sys/debug.h> 43 #include <sys/atomic.h> 44 #include <sys/strsun.h> 45 #include <sys/random.h> 46 #include <netinet/in.h> 47 #include <net/if.h> 48 #include <netinet/ip6.h> 49 #include <net/pfkeyv2.h> 50 51 #include <inet/common.h> 52 #include <inet/mi.h> 53 #include <inet/nd.h> 54 #include <inet/ip.h> 55 #include <inet/ip_impl.h> 56 #include <inet/ip6.h> 57 #include <inet/sadb.h> 58 #include <inet/ipsec_info.h> 59 #include <inet/ipsec_impl.h> 60 #include <inet/ipsecesp.h> 61 #include <inet/ipdrop.h> 62 #include <inet/tcp.h> 63 #include <sys/kstat.h> 64 #include <sys/policy.h> 65 #include <sys/strsun.h> 66 #include <inet/udp_impl.h> 67 #include <sys/taskq.h> 68 #include <sys/note.h> 69 70 #include <sys/iphada.h> 71 72 /* 73 * Table of ND variables supported by ipsecesp. These are loaded into 74 * ipsecesp_g_nd in ipsecesp_init_nd. 75 * All of these are alterable, within the min/max values given, at run time. 76 */ 77 static ipsecespparam_t lcl_param_arr[] = { 78 /* min max value name */ 79 { 0, 3, 0, "ipsecesp_debug"}, 80 { 125, 32000, SADB_AGE_INTERVAL_DEFAULT, "ipsecesp_age_interval"}, 81 { 1, 10, 1, "ipsecesp_reap_delay"}, 82 { 1, SADB_MAX_REPLAY, 64, "ipsecesp_replay_size"}, 83 { 1, 300, 15, "ipsecesp_acquire_timeout"}, 84 { 1, 1800, 90, "ipsecesp_larval_timeout"}, 85 /* Default lifetime values for ACQUIRE messages. */ 86 { 0, 0xffffffffU, 0, "ipsecesp_default_soft_bytes"}, 87 { 0, 0xffffffffU, 0, "ipsecesp_default_hard_bytes"}, 88 { 0, 0xffffffffU, 24000, "ipsecesp_default_soft_addtime"}, 89 { 0, 0xffffffffU, 28800, "ipsecesp_default_hard_addtime"}, 90 { 0, 0xffffffffU, 0, "ipsecesp_default_soft_usetime"}, 91 { 0, 0xffffffffU, 0, "ipsecesp_default_hard_usetime"}, 92 { 0, 1, 0, "ipsecesp_log_unknown_spi"}, 93 { 0, 2, 1, "ipsecesp_padding_check"}, 94 { 0, 600, 20, "ipsecesp_nat_keepalive_interval"}, 95 }; 96 #define ipsecesp_debug ipsecesp_params[0].ipsecesp_param_value 97 #define ipsecesp_age_interval ipsecesp_params[1].ipsecesp_param_value 98 #define ipsecesp_age_int_max ipsecesp_params[1].ipsecesp_param_max 99 #define ipsecesp_reap_delay ipsecesp_params[2].ipsecesp_param_value 100 #define ipsecesp_replay_size ipsecesp_params[3].ipsecesp_param_value 101 #define ipsecesp_acquire_timeout \ 102 ipsecesp_params[4].ipsecesp_param_value 103 #define ipsecesp_larval_timeout \ 104 ipsecesp_params[5].ipsecesp_param_value 105 #define ipsecesp_default_soft_bytes \ 106 ipsecesp_params[6].ipsecesp_param_value 107 #define ipsecesp_default_hard_bytes \ 108 ipsecesp_params[7].ipsecesp_param_value 109 #define ipsecesp_default_soft_addtime \ 110 ipsecesp_params[8].ipsecesp_param_value 111 #define ipsecesp_default_hard_addtime \ 112 ipsecesp_params[9].ipsecesp_param_value 113 #define ipsecesp_default_soft_usetime \ 114 ipsecesp_params[10].ipsecesp_param_value 115 #define ipsecesp_default_hard_usetime \ 116 ipsecesp_params[11].ipsecesp_param_value 117 #define ipsecesp_log_unknown_spi \ 118 ipsecesp_params[12].ipsecesp_param_value 119 #define ipsecesp_padding_check \ 120 ipsecesp_params[13].ipsecesp_param_value 121 /* For ipsecesp_nat_keepalive_interval, see ipsecesp.h. */ 122 123 #define esp0dbg(a) printf a 124 /* NOTE: != 0 instead of > 0 so lint doesn't complain. */ 125 #define esp1dbg(espstack, a) if (espstack->ipsecesp_debug != 0) printf a 126 #define esp2dbg(espstack, a) if (espstack->ipsecesp_debug > 1) printf a 127 #define esp3dbg(espstack, a) if (espstack->ipsecesp_debug > 2) printf a 128 129 static int ipsecesp_open(queue_t *, dev_t *, int, int, cred_t *); 130 static int ipsecesp_close(queue_t *); 131 static void ipsecesp_rput(queue_t *, mblk_t *); 132 static void ipsecesp_wput(queue_t *, mblk_t *); 133 static void *ipsecesp_stack_init(netstackid_t stackid, netstack_t *ns); 134 static void ipsecesp_stack_fini(netstackid_t stackid, void *arg); 135 static void esp_send_acquire(ipsacq_t *, mblk_t *, netstack_t *); 136 137 static void esp_prepare_udp(netstack_t *, mblk_t *, ipha_t *); 138 static ipsec_status_t esp_outbound_accelerated(mblk_t *, uint_t); 139 static ipsec_status_t esp_inbound_accelerated(mblk_t *, mblk_t *, 140 boolean_t, ipsa_t *); 141 142 static boolean_t esp_register_out(uint32_t, uint32_t, uint_t, 143 ipsecesp_stack_t *); 144 static boolean_t esp_strip_header(mblk_t *, boolean_t, uint32_t, 145 kstat_named_t **, ipsecesp_stack_t *); 146 static ipsec_status_t esp_submit_req_inbound(mblk_t *, ipsa_t *, uint_t); 147 static ipsec_status_t esp_submit_req_outbound(mblk_t *, ipsa_t *, uchar_t *, 148 uint_t); 149 /* Setable in /etc/system */ 150 uint32_t esp_hash_size = IPSEC_DEFAULT_HASH_SIZE; 151 152 static struct module_info info = { 153 5137, "ipsecesp", 0, INFPSZ, 65536, 1024 154 }; 155 156 static struct qinit rinit = { 157 (pfi_t)ipsecesp_rput, NULL, ipsecesp_open, ipsecesp_close, NULL, &info, 158 NULL 159 }; 160 161 static struct qinit winit = { 162 (pfi_t)ipsecesp_wput, NULL, ipsecesp_open, ipsecesp_close, NULL, &info, 163 NULL 164 }; 165 166 struct streamtab ipsecespinfo = { 167 &rinit, &winit, NULL, NULL 168 }; 169 170 static taskq_t *esp_taskq; 171 172 /* 173 * OTOH, this one is set at open/close, and I'm D_MTQPAIR for now. 174 * 175 * Question: Do I need this, given that all instance's esps->esps_wq point 176 * to IP? 177 * 178 * Answer: Yes, because I need to know which queue is BOUND to 179 * IPPROTO_ESP 180 */ 181 182 /* 183 * Stats. This may eventually become a full-blown SNMP MIB once that spec 184 * stabilizes. 185 */ 186 187 typedef struct esp_kstats_s { 188 kstat_named_t esp_stat_num_aalgs; 189 kstat_named_t esp_stat_good_auth; 190 kstat_named_t esp_stat_bad_auth; 191 kstat_named_t esp_stat_bad_padding; 192 kstat_named_t esp_stat_replay_failures; 193 kstat_named_t esp_stat_replay_early_failures; 194 kstat_named_t esp_stat_keysock_in; 195 kstat_named_t esp_stat_out_requests; 196 kstat_named_t esp_stat_acquire_requests; 197 kstat_named_t esp_stat_bytes_expired; 198 kstat_named_t esp_stat_out_discards; 199 kstat_named_t esp_stat_in_accelerated; 200 kstat_named_t esp_stat_out_accelerated; 201 kstat_named_t esp_stat_noaccel; 202 kstat_named_t esp_stat_crypto_sync; 203 kstat_named_t esp_stat_crypto_async; 204 kstat_named_t esp_stat_crypto_failures; 205 kstat_named_t esp_stat_num_ealgs; 206 kstat_named_t esp_stat_bad_decrypt; 207 } esp_kstats_t; 208 209 /* 210 * espstack->esp_kstats is equal to espstack->esp_ksp->ks_data if 211 * kstat_create_netstack for espstack->esp_ksp succeeds, but when it 212 * fails, it will be NULL. Note this is done for all stack instances, 213 * so it *could* fail. hence a non-NULL checking is done for 214 * ESP_BUMP_STAT and ESP_DEBUMP_STAT 215 */ 216 #define ESP_BUMP_STAT(espstack, x) \ 217 do { \ 218 if (espstack->esp_kstats != NULL) \ 219 (espstack->esp_kstats->esp_stat_ ## x).value.ui64++; \ 220 _NOTE(CONSTCOND) \ 221 } while (0) 222 223 #define ESP_DEBUMP_STAT(espstack, x) \ 224 do { \ 225 if (espstack->esp_kstats != NULL) \ 226 (espstack->esp_kstats->esp_stat_ ## x).value.ui64--; \ 227 _NOTE(CONSTCOND) \ 228 } while (0) 229 230 static int esp_kstat_update(kstat_t *, int); 231 232 static boolean_t 233 esp_kstat_init(ipsecesp_stack_t *espstack, netstackid_t stackid) 234 { 235 espstack->esp_ksp = kstat_create_netstack("ipsecesp", 0, "esp_stat", 236 "net", KSTAT_TYPE_NAMED, 237 sizeof (esp_kstats_t) / sizeof (kstat_named_t), 238 KSTAT_FLAG_PERSISTENT, stackid); 239 240 if (espstack->esp_ksp == NULL || espstack->esp_ksp->ks_data == NULL) 241 return (B_FALSE); 242 243 espstack->esp_kstats = espstack->esp_ksp->ks_data; 244 245 espstack->esp_ksp->ks_update = esp_kstat_update; 246 espstack->esp_ksp->ks_private = (void *)(uintptr_t)stackid; 247 248 #define K64 KSTAT_DATA_UINT64 249 #define KI(x) kstat_named_init(&(espstack->esp_kstats->esp_stat_##x), #x, K64) 250 251 KI(num_aalgs); 252 KI(num_ealgs); 253 KI(good_auth); 254 KI(bad_auth); 255 KI(bad_padding); 256 KI(replay_failures); 257 KI(replay_early_failures); 258 KI(keysock_in); 259 KI(out_requests); 260 KI(acquire_requests); 261 KI(bytes_expired); 262 KI(out_discards); 263 KI(in_accelerated); 264 KI(out_accelerated); 265 KI(noaccel); 266 KI(crypto_sync); 267 KI(crypto_async); 268 KI(crypto_failures); 269 KI(bad_decrypt); 270 271 #undef KI 272 #undef K64 273 274 kstat_install(espstack->esp_ksp); 275 276 return (B_TRUE); 277 } 278 279 static int 280 esp_kstat_update(kstat_t *kp, int rw) 281 { 282 esp_kstats_t *ekp; 283 netstackid_t stackid = (zoneid_t)(uintptr_t)kp->ks_private; 284 netstack_t *ns; 285 ipsec_stack_t *ipss; 286 287 if ((kp == NULL) || (kp->ks_data == NULL)) 288 return (EIO); 289 290 if (rw == KSTAT_WRITE) 291 return (EACCES); 292 293 ns = netstack_find_by_stackid(stackid); 294 if (ns == NULL) 295 return (-1); 296 ipss = ns->netstack_ipsec; 297 if (ipss == NULL) { 298 netstack_rele(ns); 299 return (-1); 300 } 301 ekp = (esp_kstats_t *)kp->ks_data; 302 303 mutex_enter(&ipss->ipsec_alg_lock); 304 ekp->esp_stat_num_aalgs.value.ui64 = 305 ipss->ipsec_nalgs[IPSEC_ALG_AUTH]; 306 ekp->esp_stat_num_ealgs.value.ui64 = 307 ipss->ipsec_nalgs[IPSEC_ALG_ENCR]; 308 mutex_exit(&ipss->ipsec_alg_lock); 309 310 netstack_rele(ns); 311 return (0); 312 } 313 314 #ifdef DEBUG 315 /* 316 * Debug routine, useful to see pre-encryption data. 317 */ 318 static char * 319 dump_msg(mblk_t *mp) 320 { 321 char tmp_str[3], tmp_line[256]; 322 323 while (mp != NULL) { 324 unsigned char *ptr; 325 326 printf("mblk address 0x%p, length %ld, db_ref %d " 327 "type %d, base 0x%p, lim 0x%p\n", 328 (void *) mp, (long)(mp->b_wptr - mp->b_rptr), 329 mp->b_datap->db_ref, mp->b_datap->db_type, 330 (void *)mp->b_datap->db_base, (void *)mp->b_datap->db_lim); 331 ptr = mp->b_rptr; 332 333 tmp_line[0] = '\0'; 334 while (ptr < mp->b_wptr) { 335 uint_t diff; 336 337 diff = (ptr - mp->b_rptr); 338 if (!(diff & 0x1f)) { 339 if (strlen(tmp_line) > 0) { 340 printf("bytes: %s\n", tmp_line); 341 tmp_line[0] = '\0'; 342 } 343 } 344 if (!(diff & 0x3)) 345 (void) strcat(tmp_line, " "); 346 (void) sprintf(tmp_str, "%02x", *ptr); 347 (void) strcat(tmp_line, tmp_str); 348 ptr++; 349 } 350 if (strlen(tmp_line) > 0) 351 printf("bytes: %s\n", tmp_line); 352 353 mp = mp->b_cont; 354 } 355 356 return ("\n"); 357 } 358 359 #else /* DEBUG */ 360 static char * 361 dump_msg(mblk_t *mp) 362 { 363 printf("Find value of mp %p.\n", mp); 364 return ("\n"); 365 } 366 #endif /* DEBUG */ 367 368 /* 369 * Don't have to lock age_interval, as only one thread will access it at 370 * a time, because I control the one function that does with timeout(). 371 */ 372 static void 373 esp_ager(void *arg) 374 { 375 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)arg; 376 netstack_t *ns = espstack->ipsecesp_netstack; 377 hrtime_t begin = gethrtime(); 378 379 sadb_ager(&espstack->esp_sadb.s_v4, espstack->esp_pfkey_q, 380 espstack->esp_sadb.s_ip_q, espstack->ipsecesp_reap_delay, ns); 381 sadb_ager(&espstack->esp_sadb.s_v6, espstack->esp_pfkey_q, 382 espstack->esp_sadb.s_ip_q, espstack->ipsecesp_reap_delay, ns); 383 384 espstack->esp_event = sadb_retimeout(begin, espstack->esp_pfkey_q, 385 esp_ager, espstack, 386 &espstack->ipsecesp_age_interval, espstack->ipsecesp_age_int_max, 387 info.mi_idnum); 388 } 389 390 /* 391 * Get an ESP NDD parameter. 392 */ 393 /* ARGSUSED */ 394 static int 395 ipsecesp_param_get(q, mp, cp, cr) 396 queue_t *q; 397 mblk_t *mp; 398 caddr_t cp; 399 cred_t *cr; 400 { 401 ipsecespparam_t *ipsecesppa = (ipsecespparam_t *)cp; 402 uint_t value; 403 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 404 405 mutex_enter(&espstack->ipsecesp_param_lock); 406 value = ipsecesppa->ipsecesp_param_value; 407 mutex_exit(&espstack->ipsecesp_param_lock); 408 409 (void) mi_mpprintf(mp, "%u", value); 410 return (0); 411 } 412 413 /* 414 * This routine sets an NDD variable in a ipsecespparam_t structure. 415 */ 416 /* ARGSUSED */ 417 static int 418 ipsecesp_param_set(q, mp, value, cp, cr) 419 queue_t *q; 420 mblk_t *mp; 421 char *value; 422 caddr_t cp; 423 cred_t *cr; 424 { 425 ulong_t new_value; 426 ipsecespparam_t *ipsecesppa = (ipsecespparam_t *)cp; 427 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 428 429 /* 430 * Fail the request if the new value does not lie within the 431 * required bounds. 432 */ 433 if (ddi_strtoul(value, NULL, 10, &new_value) != 0 || 434 new_value < ipsecesppa->ipsecesp_param_min || 435 new_value > ipsecesppa->ipsecesp_param_max) { 436 return (EINVAL); 437 } 438 439 /* Set the new value */ 440 mutex_enter(&espstack->ipsecesp_param_lock); 441 ipsecesppa->ipsecesp_param_value = new_value; 442 mutex_exit(&espstack->ipsecesp_param_lock); 443 return (0); 444 } 445 446 /* 447 * Using lifetime NDD variables, fill in an extended combination's 448 * lifetime information. 449 */ 450 void 451 ipsecesp_fill_defs(sadb_x_ecomb_t *ecomb, netstack_t *ns) 452 { 453 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 454 455 ecomb->sadb_x_ecomb_soft_bytes = espstack->ipsecesp_default_soft_bytes; 456 ecomb->sadb_x_ecomb_hard_bytes = espstack->ipsecesp_default_hard_bytes; 457 ecomb->sadb_x_ecomb_soft_addtime = 458 espstack->ipsecesp_default_soft_addtime; 459 ecomb->sadb_x_ecomb_hard_addtime = 460 espstack->ipsecesp_default_hard_addtime; 461 ecomb->sadb_x_ecomb_soft_usetime = 462 espstack->ipsecesp_default_soft_usetime; 463 ecomb->sadb_x_ecomb_hard_usetime = 464 espstack->ipsecesp_default_hard_usetime; 465 } 466 467 /* 468 * Initialize things for ESP at module load time. 469 */ 470 boolean_t 471 ipsecesp_ddi_init(void) 472 { 473 esp_taskq = taskq_create("esp_taskq", 1, minclsyspri, 474 IPSEC_TASKQ_MIN, IPSEC_TASKQ_MAX, 0); 475 476 /* 477 * We want to be informed each time a stack is created or 478 * destroyed in the kernel, so we can maintain the 479 * set of ipsecesp_stack_t's. 480 */ 481 netstack_register(NS_IPSECESP, ipsecesp_stack_init, NULL, 482 ipsecesp_stack_fini); 483 484 return (B_TRUE); 485 } 486 487 /* 488 * Walk through the param array specified registering each element with the 489 * named dispatch handler. 490 */ 491 static boolean_t 492 ipsecesp_param_register(IDP *ndp, ipsecespparam_t *espp, int cnt) 493 { 494 for (; cnt-- > 0; espp++) { 495 if (espp->ipsecesp_param_name != NULL && 496 espp->ipsecesp_param_name[0]) { 497 if (!nd_load(ndp, 498 espp->ipsecesp_param_name, 499 ipsecesp_param_get, ipsecesp_param_set, 500 (caddr_t)espp)) { 501 nd_free(ndp); 502 return (B_FALSE); 503 } 504 } 505 } 506 return (B_TRUE); 507 } 508 /* 509 * Initialize things for ESP for each stack instance 510 */ 511 static void * 512 ipsecesp_stack_init(netstackid_t stackid, netstack_t *ns) 513 { 514 ipsecesp_stack_t *espstack; 515 ipsecespparam_t *espp; 516 517 espstack = (ipsecesp_stack_t *)kmem_zalloc(sizeof (*espstack), 518 KM_SLEEP); 519 espstack->ipsecesp_netstack = ns; 520 521 espp = (ipsecespparam_t *)kmem_alloc(sizeof (lcl_param_arr), KM_SLEEP); 522 espstack->ipsecesp_params = espp; 523 bcopy(lcl_param_arr, espp, sizeof (lcl_param_arr)); 524 525 (void) ipsecesp_param_register(&espstack->ipsecesp_g_nd, espp, 526 A_CNT(lcl_param_arr)); 527 528 (void) esp_kstat_init(espstack, stackid); 529 530 espstack->esp_sadb.s_acquire_timeout = 531 &espstack->ipsecesp_acquire_timeout; 532 espstack->esp_sadb.s_acqfn = esp_send_acquire; 533 sadbp_init("ESP", &espstack->esp_sadb, SADB_SATYPE_ESP, esp_hash_size, 534 espstack->ipsecesp_netstack); 535 536 mutex_init(&espstack->ipsecesp_param_lock, NULL, MUTEX_DEFAULT, 0); 537 538 ip_drop_register(&espstack->esp_dropper, "IPsec ESP"); 539 return (espstack); 540 } 541 542 /* 543 * Destroy things for ESP at module unload time. 544 */ 545 void 546 ipsecesp_ddi_destroy(void) 547 { 548 netstack_unregister(NS_IPSECESP); 549 taskq_destroy(esp_taskq); 550 } 551 552 /* 553 * Destroy things for ESP for one stack instance 554 */ 555 static void 556 ipsecesp_stack_fini(netstackid_t stackid, void *arg) 557 { 558 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)arg; 559 560 if (espstack->esp_pfkey_q != NULL) { 561 (void) quntimeout(espstack->esp_pfkey_q, espstack->esp_event); 562 } 563 espstack->esp_sadb.s_acqfn = NULL; 564 espstack->esp_sadb.s_acquire_timeout = NULL; 565 sadbp_destroy(&espstack->esp_sadb, espstack->ipsecesp_netstack); 566 ip_drop_unregister(&espstack->esp_dropper); 567 mutex_destroy(&espstack->ipsecesp_param_lock); 568 nd_free(&espstack->ipsecesp_g_nd); 569 570 kmem_free(espstack->ipsecesp_params, sizeof (lcl_param_arr)); 571 espstack->ipsecesp_params = NULL; 572 kstat_delete_netstack(espstack->esp_ksp, stackid); 573 espstack->esp_ksp = NULL; 574 espstack->esp_kstats = NULL; 575 kmem_free(espstack, sizeof (*espstack)); 576 } 577 578 /* 579 * ESP module open routine. 580 */ 581 /* ARGSUSED */ 582 static int 583 ipsecesp_open(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp) 584 { 585 netstack_t *ns; 586 ipsecesp_stack_t *espstack; 587 588 if (secpolicy_ip_config(credp, B_FALSE) != 0) { 589 esp0dbg(("Non-privileged user trying to open ipsecesp.\n")); 590 return (EPERM); 591 } 592 593 if (q->q_ptr != NULL) 594 return (0); /* Re-open of an already open instance. */ 595 596 if (sflag != MODOPEN) 597 return (EINVAL); 598 599 ns = netstack_find_by_cred(credp); 600 ASSERT(ns != NULL); 601 espstack = ns->netstack_ipsecesp; 602 ASSERT(espstack != NULL); 603 604 /* 605 * ASSUMPTIONS (because I'm MT_OCEXCL): 606 * 607 * * I'm being pushed on top of IP for all my opens (incl. #1). 608 * * Only ipsecesp_open() can write into esp_sadb.s_ip_q. 609 * * Because of this, I can check lazily for esp_sadb.s_ip_q. 610 * 611 * If these assumptions are wrong, I'm in BIG trouble... 612 */ 613 614 q->q_ptr = espstack; 615 WR(q)->q_ptr = q->q_ptr; 616 617 if (espstack->esp_sadb.s_ip_q == NULL) { 618 struct T_unbind_req *tur; 619 620 espstack->esp_sadb.s_ip_q = WR(q); 621 /* Allocate an unbind... */ 622 espstack->esp_ip_unbind = allocb(sizeof (struct T_unbind_req), 623 BPRI_HI); 624 625 /* 626 * Send down T_BIND_REQ to bind IPPROTO_ESP. 627 * Handle the ACK here in ESP. 628 */ 629 qprocson(q); 630 if (espstack->esp_ip_unbind == NULL || 631 !sadb_t_bind_req(espstack->esp_sadb.s_ip_q, IPPROTO_ESP)) { 632 if (espstack->esp_ip_unbind != NULL) { 633 freeb(espstack->esp_ip_unbind); 634 espstack->esp_ip_unbind = NULL; 635 } 636 q->q_ptr = NULL; 637 netstack_rele(espstack->ipsecesp_netstack); 638 return (ENOMEM); 639 } 640 641 espstack->esp_ip_unbind->b_datap->db_type = M_PROTO; 642 tur = (struct T_unbind_req *)espstack->esp_ip_unbind->b_rptr; 643 tur->PRIM_type = T_UNBIND_REQ; 644 } else { 645 qprocson(q); 646 } 647 648 /* 649 * For now, there's not much I can do. I'll be getting a message 650 * passed down to me from keysock (in my wput), and a T_BIND_ACK 651 * up from IP (in my rput). 652 */ 653 654 return (0); 655 } 656 657 /* 658 * ESP module close routine. 659 */ 660 static int 661 ipsecesp_close(queue_t *q) 662 { 663 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 664 665 /* 666 * If esp_sadb.s_ip_q is attached to this instance, send a 667 * T_UNBIND_REQ to IP for the instance before doing 668 * a qprocsoff(). 669 */ 670 if (WR(q) == espstack->esp_sadb.s_ip_q && 671 espstack->esp_ip_unbind != NULL) { 672 putnext(WR(q), espstack->esp_ip_unbind); 673 espstack->esp_ip_unbind = NULL; 674 } 675 676 /* 677 * Clean up q_ptr, if needed. 678 */ 679 qprocsoff(q); 680 681 /* Keysock queue check is safe, because of OCEXCL perimeter. */ 682 683 if (q == espstack->esp_pfkey_q) { 684 esp1dbg(espstack, 685 ("ipsecesp_close: Ummm... keysock is closing ESP.\n")); 686 espstack->esp_pfkey_q = NULL; 687 /* Detach qtimeouts. */ 688 (void) quntimeout(q, espstack->esp_event); 689 } 690 691 if (WR(q) == espstack->esp_sadb.s_ip_q) { 692 /* 693 * If the esp_sadb.s_ip_q is attached to this instance, find 694 * another. The OCEXCL outer perimeter helps us here. 695 */ 696 espstack->esp_sadb.s_ip_q = NULL; 697 698 /* 699 * Find a replacement queue for esp_sadb.s_ip_q. 700 */ 701 if (espstack->esp_pfkey_q != NULL && 702 espstack->esp_pfkey_q != RD(q)) { 703 /* 704 * See if we can use the pfkey_q. 705 */ 706 espstack->esp_sadb.s_ip_q = WR(espstack->esp_pfkey_q); 707 } 708 709 if (espstack->esp_sadb.s_ip_q == NULL || 710 !sadb_t_bind_req(espstack->esp_sadb.s_ip_q, IPPROTO_ESP)) { 711 esp1dbg(espstack, ("ipsecesp: Can't reassign ip_q.\n")); 712 espstack->esp_sadb.s_ip_q = NULL; 713 } else { 714 espstack->esp_ip_unbind = 715 allocb(sizeof (struct T_unbind_req), BPRI_HI); 716 717 if (espstack->esp_ip_unbind != NULL) { 718 struct T_unbind_req *tur; 719 720 espstack->esp_ip_unbind->b_datap->db_type = 721 M_PROTO; 722 tur = (struct T_unbind_req *) 723 espstack->esp_ip_unbind->b_rptr; 724 tur->PRIM_type = T_UNBIND_REQ; 725 } 726 /* If it's NULL, I can't do much here. */ 727 } 728 } 729 730 netstack_rele(espstack->ipsecesp_netstack); 731 return (0); 732 } 733 734 /* 735 * Add a number of bytes to what the SA has protected so far. Return 736 * B_TRUE if the SA can still protect that many bytes. 737 * 738 * Caller must REFRELE the passed-in assoc. This function must REFRELE 739 * any obtained peer SA. 740 */ 741 static boolean_t 742 esp_age_bytes(ipsa_t *assoc, uint64_t bytes, boolean_t inbound) 743 { 744 ipsa_t *inassoc, *outassoc; 745 isaf_t *bucket; 746 boolean_t inrc, outrc, isv6; 747 sadb_t *sp; 748 int outhash; 749 netstack_t *ns = assoc->ipsa_netstack; 750 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 751 752 /* No peer? No problem! */ 753 if (!assoc->ipsa_haspeer) { 754 return (sadb_age_bytes(espstack->esp_pfkey_q, assoc, bytes, 755 B_TRUE)); 756 } 757 758 /* 759 * Otherwise, we want to grab both the original assoc and its peer. 760 * There might be a race for this, but if it's a real race, two 761 * expire messages may occur. We limit this by only sending the 762 * expire message on one of the peers, we'll pick the inbound 763 * arbitrarily. 764 * 765 * If we need tight synchronization on the peer SA, then we need to 766 * reconsider. 767 */ 768 769 /* Use address length to select IPv6/IPv4 */ 770 isv6 = (assoc->ipsa_addrfam == AF_INET6); 771 sp = isv6 ? &espstack->esp_sadb.s_v6 : &espstack->esp_sadb.s_v4; 772 773 if (inbound) { 774 inassoc = assoc; 775 if (isv6) { 776 outhash = OUTBOUND_HASH_V6(sp, *((in6_addr_t *) 777 &inassoc->ipsa_dstaddr)); 778 } else { 779 outhash = OUTBOUND_HASH_V4(sp, *((ipaddr_t *) 780 &inassoc->ipsa_dstaddr)); 781 } 782 bucket = &sp->sdb_of[outhash]; 783 mutex_enter(&bucket->isaf_lock); 784 outassoc = ipsec_getassocbyspi(bucket, inassoc->ipsa_spi, 785 inassoc->ipsa_srcaddr, inassoc->ipsa_dstaddr, 786 inassoc->ipsa_addrfam); 787 mutex_exit(&bucket->isaf_lock); 788 if (outassoc == NULL) { 789 /* Q: Do we wish to set haspeer == B_FALSE? */ 790 esp0dbg(("esp_age_bytes: " 791 "can't find peer for inbound.\n")); 792 return (sadb_age_bytes(espstack->esp_pfkey_q, inassoc, 793 bytes, B_TRUE)); 794 } 795 } else { 796 outassoc = assoc; 797 bucket = INBOUND_BUCKET(sp, outassoc->ipsa_spi); 798 mutex_enter(&bucket->isaf_lock); 799 inassoc = ipsec_getassocbyspi(bucket, outassoc->ipsa_spi, 800 outassoc->ipsa_srcaddr, outassoc->ipsa_dstaddr, 801 outassoc->ipsa_addrfam); 802 mutex_exit(&bucket->isaf_lock); 803 if (inassoc == NULL) { 804 /* Q: Do we wish to set haspeer == B_FALSE? */ 805 esp0dbg(("esp_age_bytes: " 806 "can't find peer for outbound.\n")); 807 return (sadb_age_bytes(espstack->esp_pfkey_q, outassoc, 808 bytes, B_TRUE)); 809 } 810 } 811 812 inrc = sadb_age_bytes(espstack->esp_pfkey_q, inassoc, bytes, B_TRUE); 813 outrc = sadb_age_bytes(espstack->esp_pfkey_q, outassoc, bytes, B_FALSE); 814 815 /* 816 * REFRELE any peer SA. 817 * 818 * Because of the multi-line macro nature of IPSA_REFRELE, keep 819 * them in { }. 820 */ 821 if (inbound) { 822 IPSA_REFRELE(outassoc); 823 } else { 824 IPSA_REFRELE(inassoc); 825 } 826 827 return (inrc && outrc); 828 } 829 830 /* 831 * Do incoming NAT-T manipulations for packet. 832 */ 833 static ipsec_status_t 834 esp_fix_natt_checksums(mblk_t *data_mp, ipsa_t *assoc) 835 { 836 ipha_t *ipha = (ipha_t *)data_mp->b_rptr; 837 tcpha_t *tcph; 838 udpha_t *udpha; 839 /* Initialize to our inbound cksum adjustment... */ 840 uint32_t sum = assoc->ipsa_inbound_cksum; 841 842 switch (ipha->ipha_protocol) { 843 case IPPROTO_TCP: 844 tcph = (tcpha_t *)(data_mp->b_rptr + 845 IPH_HDR_LENGTH(ipha)); 846 847 #define DOWN_SUM(x) (x) = ((x) & 0xFFFF) + ((x) >> 16) 848 sum += ~ntohs(tcph->tha_sum) & 0xFFFF; 849 DOWN_SUM(sum); 850 DOWN_SUM(sum); 851 tcph->tha_sum = ~htons(sum); 852 break; 853 case IPPROTO_UDP: 854 udpha = (udpha_t *)(data_mp->b_rptr + IPH_HDR_LENGTH(ipha)); 855 856 if (udpha->uha_checksum != 0) { 857 /* Adujst if the inbound one was not zero. */ 858 sum += ~ntohs(udpha->uha_checksum) & 0xFFFF; 859 DOWN_SUM(sum); 860 DOWN_SUM(sum); 861 udpha->uha_checksum = ~htons(sum); 862 if (udpha->uha_checksum == 0) 863 udpha->uha_checksum = 0xFFFF; 864 } 865 #undef DOWN_SUM 866 break; 867 case IPPROTO_IP: 868 /* 869 * This case is only an issue for self-encapsulated 870 * packets. So for now, fall through. 871 */ 872 break; 873 } 874 return (IPSEC_STATUS_SUCCESS); 875 } 876 877 878 /* 879 * Strip ESP header, check padding, and fix IP header. 880 * Returns B_TRUE on success, B_FALSE if an error occured. 881 */ 882 static boolean_t 883 esp_strip_header(mblk_t *data_mp, boolean_t isv4, uint32_t ivlen, 884 kstat_named_t **counter, ipsecesp_stack_t *espstack) 885 { 886 ipha_t *ipha; 887 ip6_t *ip6h; 888 uint_t divpoint; 889 mblk_t *scratch; 890 uint8_t nexthdr, padlen; 891 uint8_t lastpad; 892 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 893 uint8_t *lastbyte; 894 895 /* 896 * Strip ESP data and fix IP header. 897 * 898 * XXX In case the beginning of esp_inbound() changes to not do a 899 * pullup, this part of the code can remain unchanged. 900 */ 901 if (isv4) { 902 ASSERT((data_mp->b_wptr - data_mp->b_rptr) >= sizeof (ipha_t)); 903 ipha = (ipha_t *)data_mp->b_rptr; 904 ASSERT((data_mp->b_wptr - data_mp->b_rptr) >= sizeof (esph_t) + 905 IPH_HDR_LENGTH(ipha)); 906 divpoint = IPH_HDR_LENGTH(ipha); 907 } else { 908 ASSERT((data_mp->b_wptr - data_mp->b_rptr) >= sizeof (ip6_t)); 909 ip6h = (ip6_t *)data_mp->b_rptr; 910 divpoint = ip_hdr_length_v6(data_mp, ip6h); 911 } 912 913 scratch = data_mp; 914 while (scratch->b_cont != NULL) 915 scratch = scratch->b_cont; 916 917 ASSERT((scratch->b_wptr - scratch->b_rptr) >= 3); 918 919 /* 920 * "Next header" and padding length are the last two bytes in the 921 * ESP-protected datagram, thus the explicit - 1 and - 2. 922 * lastpad is the last byte of the padding, which can be used for 923 * a quick check to see if the padding is correct. 924 */ 925 lastbyte = scratch->b_wptr - 1; 926 nexthdr = *lastbyte--; 927 padlen = *lastbyte--; 928 929 if (isv4) { 930 /* Fix part of the IP header. */ 931 ipha->ipha_protocol = nexthdr; 932 /* 933 * Reality check the padlen. The explicit - 2 is for the 934 * padding length and the next-header bytes. 935 */ 936 if (padlen >= ntohs(ipha->ipha_length) - sizeof (ipha_t) - 2 - 937 sizeof (esph_t) - ivlen) { 938 ESP_BUMP_STAT(espstack, bad_decrypt); 939 ipsec_rl_strlog(espstack->ipsecesp_netstack, 940 info.mi_idnum, 0, 0, 941 SL_ERROR | SL_WARN, 942 "Corrupt ESP packet (padlen too big).\n"); 943 esp1dbg(espstack, ("padlen (%d) is greater than:\n", 944 padlen)); 945 esp1dbg(espstack, ("pkt len(%d) - ip hdr - esp " 946 "hdr - ivlen(%d) = %d.\n", 947 ntohs(ipha->ipha_length), ivlen, 948 (int)(ntohs(ipha->ipha_length) - sizeof (ipha_t) - 949 2 - sizeof (esph_t) - ivlen))); 950 *counter = DROPPER(ipss, ipds_esp_bad_padlen); 951 return (B_FALSE); 952 } 953 954 /* 955 * Fix the rest of the header. The explicit - 2 is for the 956 * padding length and the next-header bytes. 957 */ 958 ipha->ipha_length = htons(ntohs(ipha->ipha_length) - padlen - 959 2 - sizeof (esph_t) - ivlen); 960 ipha->ipha_hdr_checksum = 0; 961 ipha->ipha_hdr_checksum = (uint16_t)ip_csum_hdr(ipha); 962 } else { 963 if (ip6h->ip6_nxt == IPPROTO_ESP) { 964 ip6h->ip6_nxt = nexthdr; 965 } else { 966 ip6_pkt_t ipp; 967 968 bzero(&ipp, sizeof (ipp)); 969 (void) ip_find_hdr_v6(data_mp, ip6h, &ipp, NULL); 970 if (ipp.ipp_dstopts != NULL) { 971 ipp.ipp_dstopts->ip6d_nxt = nexthdr; 972 } else if (ipp.ipp_rthdr != NULL) { 973 ipp.ipp_rthdr->ip6r_nxt = nexthdr; 974 } else if (ipp.ipp_hopopts != NULL) { 975 ipp.ipp_hopopts->ip6h_nxt = nexthdr; 976 } else { 977 /* Panic a DEBUG kernel. */ 978 ASSERT(ipp.ipp_hopopts != NULL); 979 /* Otherwise, pretend it's IP + ESP. */ 980 cmn_err(CE_WARN, "ESP IPv6 headers wrong.\n"); 981 ip6h->ip6_nxt = nexthdr; 982 } 983 } 984 985 if (padlen >= ntohs(ip6h->ip6_plen) - 2 - sizeof (esph_t) - 986 ivlen) { 987 ESP_BUMP_STAT(espstack, bad_decrypt); 988 ipsec_rl_strlog(espstack->ipsecesp_netstack, 989 info.mi_idnum, 0, 0, 990 SL_ERROR | SL_WARN, 991 "Corrupt ESP packet (v6 padlen too big).\n"); 992 esp1dbg(espstack, ("padlen (%d) is greater than:\n", 993 padlen)); 994 esp1dbg(espstack, 995 ("pkt len(%u) - ip hdr - esp hdr - ivlen(%d) = " 996 "%u.\n", (unsigned)(ntohs(ip6h->ip6_plen) 997 + sizeof (ip6_t)), ivlen, 998 (unsigned)(ntohs(ip6h->ip6_plen) - 2 - 999 sizeof (esph_t) - ivlen))); 1000 *counter = DROPPER(ipss, ipds_esp_bad_padlen); 1001 return (B_FALSE); 1002 } 1003 1004 1005 /* 1006 * Fix the rest of the header. The explicit - 2 is for the 1007 * padding length and the next-header bytes. IPv6 is nice, 1008 * because there's no hdr checksum! 1009 */ 1010 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) - padlen - 1011 2 - sizeof (esph_t) - ivlen); 1012 } 1013 1014 if (espstack->ipsecesp_padding_check > 0 && padlen > 0) { 1015 /* 1016 * Weak padding check: compare last-byte to length, they 1017 * should be equal. 1018 */ 1019 lastpad = *lastbyte--; 1020 1021 if (padlen != lastpad) { 1022 ipsec_rl_strlog(espstack->ipsecesp_netstack, 1023 info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 1024 "Corrupt ESP packet (lastpad != padlen).\n"); 1025 esp1dbg(espstack, 1026 ("lastpad (%d) not equal to padlen (%d):\n", 1027 lastpad, padlen)); 1028 ESP_BUMP_STAT(espstack, bad_padding); 1029 *counter = DROPPER(ipss, ipds_esp_bad_padding); 1030 return (B_FALSE); 1031 } 1032 1033 /* 1034 * Strong padding check: Check all pad bytes to see that 1035 * they're ascending. Go backwards using a descending counter 1036 * to verify. padlen == 1 is checked by previous block, so 1037 * only bother if we've more than 1 byte of padding. 1038 * Consequently, start the check one byte before the location 1039 * of "lastpad". 1040 */ 1041 if (espstack->ipsecesp_padding_check > 1) { 1042 /* 1043 * This assert may have to become an if and a pullup 1044 * if we start accepting multi-dblk mblks. For now, 1045 * though, any packet here will have been pulled up in 1046 * esp_inbound. 1047 */ 1048 ASSERT(MBLKL(scratch) >= lastpad + 3); 1049 1050 /* 1051 * Use "--lastpad" because we already checked the very 1052 * last pad byte previously. 1053 */ 1054 while (--lastpad != 0) { 1055 if (lastpad != *lastbyte) { 1056 ipsec_rl_strlog( 1057 espstack->ipsecesp_netstack, 1058 info.mi_idnum, 0, 0, 1059 SL_ERROR | SL_WARN, "Corrupt ESP " 1060 "packet (bad padding).\n"); 1061 esp1dbg(espstack, 1062 ("padding not in correct" 1063 " format:\n")); 1064 ESP_BUMP_STAT(espstack, bad_padding); 1065 *counter = DROPPER(ipss, 1066 ipds_esp_bad_padding); 1067 return (B_FALSE); 1068 } 1069 lastbyte--; 1070 } 1071 } 1072 } 1073 1074 /* Trim off the padding. */ 1075 ASSERT(data_mp->b_cont == NULL); 1076 data_mp->b_wptr -= (padlen + 2); 1077 1078 /* 1079 * Remove the ESP header. 1080 * 1081 * The above assertions about data_mp's size will make this work. 1082 * 1083 * XXX Question: If I send up and get back a contiguous mblk, 1084 * would it be quicker to bcopy over, or keep doing the dupb stuff? 1085 * I go with copying for now. 1086 */ 1087 1088 if (IS_P2ALIGNED(data_mp->b_rptr, sizeof (uint32_t)) && 1089 IS_P2ALIGNED(ivlen, sizeof (uint32_t))) { 1090 uint8_t *start = data_mp->b_rptr; 1091 uint32_t *src, *dst; 1092 1093 src = (uint32_t *)(start + divpoint); 1094 dst = (uint32_t *)(start + divpoint + sizeof (esph_t) + ivlen); 1095 1096 ASSERT(IS_P2ALIGNED(dst, sizeof (uint32_t)) && 1097 IS_P2ALIGNED(src, sizeof (uint32_t))); 1098 1099 do { 1100 src--; 1101 dst--; 1102 *dst = *src; 1103 } while (src != (uint32_t *)start); 1104 1105 data_mp->b_rptr = (uchar_t *)dst; 1106 } else { 1107 uint8_t *start = data_mp->b_rptr; 1108 uint8_t *src, *dst; 1109 1110 src = start + divpoint; 1111 dst = src + sizeof (esph_t) + ivlen; 1112 1113 do { 1114 src--; 1115 dst--; 1116 *dst = *src; 1117 } while (src != start); 1118 1119 data_mp->b_rptr = dst; 1120 } 1121 1122 esp2dbg(espstack, ("data_mp after inbound ESP adjustment:\n")); 1123 esp2dbg(espstack, (dump_msg(data_mp))); 1124 1125 return (B_TRUE); 1126 } 1127 1128 /* 1129 * Updating use times can be tricky business if the ipsa_haspeer flag is 1130 * set. This function is called once in an SA's lifetime. 1131 * 1132 * Caller has to REFRELE "assoc" which is passed in. This function has 1133 * to REFRELE any peer SA that is obtained. 1134 */ 1135 static void 1136 esp_set_usetime(ipsa_t *assoc, boolean_t inbound) 1137 { 1138 ipsa_t *inassoc, *outassoc; 1139 isaf_t *bucket; 1140 sadb_t *sp; 1141 int outhash; 1142 boolean_t isv6; 1143 netstack_t *ns = assoc->ipsa_netstack; 1144 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 1145 1146 /* No peer? No problem! */ 1147 if (!assoc->ipsa_haspeer) { 1148 sadb_set_usetime(assoc); 1149 return; 1150 } 1151 1152 /* 1153 * Otherwise, we want to grab both the original assoc and its peer. 1154 * There might be a race for this, but if it's a real race, the times 1155 * will be out-of-synch by at most a second, and since our time 1156 * granularity is a second, this won't be a problem. 1157 * 1158 * If we need tight synchronization on the peer SA, then we need to 1159 * reconsider. 1160 */ 1161 1162 /* Use address length to select IPv6/IPv4 */ 1163 isv6 = (assoc->ipsa_addrfam == AF_INET6); 1164 sp = isv6 ? &espstack->esp_sadb.s_v6 : &espstack->esp_sadb.s_v4; 1165 1166 if (inbound) { 1167 inassoc = assoc; 1168 if (isv6) { 1169 outhash = OUTBOUND_HASH_V6(sp, *((in6_addr_t *) 1170 &inassoc->ipsa_dstaddr)); 1171 } else { 1172 outhash = OUTBOUND_HASH_V4(sp, *((ipaddr_t *) 1173 &inassoc->ipsa_dstaddr)); 1174 } 1175 bucket = &sp->sdb_of[outhash]; 1176 mutex_enter(&bucket->isaf_lock); 1177 outassoc = ipsec_getassocbyspi(bucket, inassoc->ipsa_spi, 1178 inassoc->ipsa_srcaddr, inassoc->ipsa_dstaddr, 1179 inassoc->ipsa_addrfam); 1180 mutex_exit(&bucket->isaf_lock); 1181 if (outassoc == NULL) { 1182 /* Q: Do we wish to set haspeer == B_FALSE? */ 1183 esp0dbg(("esp_set_usetime: " 1184 "can't find peer for inbound.\n")); 1185 sadb_set_usetime(inassoc); 1186 return; 1187 } 1188 } else { 1189 outassoc = assoc; 1190 bucket = INBOUND_BUCKET(sp, outassoc->ipsa_spi); 1191 mutex_enter(&bucket->isaf_lock); 1192 inassoc = ipsec_getassocbyspi(bucket, outassoc->ipsa_spi, 1193 outassoc->ipsa_srcaddr, outassoc->ipsa_dstaddr, 1194 outassoc->ipsa_addrfam); 1195 mutex_exit(&bucket->isaf_lock); 1196 if (inassoc == NULL) { 1197 /* Q: Do we wish to set haspeer == B_FALSE? */ 1198 esp0dbg(("esp_set_usetime: " 1199 "can't find peer for outbound.\n")); 1200 sadb_set_usetime(outassoc); 1201 return; 1202 } 1203 } 1204 1205 /* Update usetime on both. */ 1206 sadb_set_usetime(inassoc); 1207 sadb_set_usetime(outassoc); 1208 1209 /* 1210 * REFRELE any peer SA. 1211 * 1212 * Because of the multi-line macro nature of IPSA_REFRELE, keep 1213 * them in { }. 1214 */ 1215 if (inbound) { 1216 IPSA_REFRELE(outassoc); 1217 } else { 1218 IPSA_REFRELE(inassoc); 1219 } 1220 } 1221 1222 /* 1223 * Handle ESP inbound data for IPv4 and IPv6. 1224 * On success returns B_TRUE, on failure returns B_FALSE and frees the 1225 * mblk chain ipsec_in_mp. 1226 */ 1227 ipsec_status_t 1228 esp_inbound(mblk_t *ipsec_in_mp, void *arg) 1229 { 1230 mblk_t *data_mp = ipsec_in_mp->b_cont; 1231 ipsec_in_t *ii = (ipsec_in_t *)ipsec_in_mp->b_rptr; 1232 esph_t *esph = (esph_t *)arg; 1233 ipsa_t *ipsa = ii->ipsec_in_esp_sa; 1234 netstack_t *ns = ii->ipsec_in_ns; 1235 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 1236 ipsec_stack_t *ipss = ns->netstack_ipsec; 1237 1238 /* 1239 * We may wish to check replay in-range-only here as an optimization. 1240 * Include the reality check of ipsa->ipsa_replay > 1241 * ipsa->ipsa_replay_wsize for times when it's the first N packets, 1242 * where N == ipsa->ipsa_replay_wsize. 1243 * 1244 * Another check that may come here later is the "collision" check. 1245 * If legitimate packets flow quickly enough, this won't be a problem, 1246 * but collisions may cause authentication algorithm crunching to 1247 * take place when it doesn't need to. 1248 */ 1249 if (!sadb_replay_peek(ipsa, esph->esph_replay)) { 1250 ESP_BUMP_STAT(espstack, replay_early_failures); 1251 IP_ESP_BUMP_STAT(ipss, in_discards); 1252 /* 1253 * TODO: Extract inbound interface from the IPSEC_IN 1254 * message's ii->ipsec_in_rill_index. 1255 */ 1256 ip_drop_packet(ipsec_in_mp, B_TRUE, NULL, NULL, 1257 DROPPER(ipss, ipds_esp_early_replay), 1258 &espstack->esp_dropper); 1259 return (IPSEC_STATUS_FAILED); 1260 } 1261 1262 /* 1263 * Has this packet already been processed by a hardware 1264 * IPsec accelerator? 1265 */ 1266 if (ii->ipsec_in_accelerated) { 1267 ipsec_status_t rv; 1268 esp3dbg(espstack, 1269 ("esp_inbound: pkt processed by ill=%d isv6=%d\n", 1270 ii->ipsec_in_ill_index, !ii->ipsec_in_v4)); 1271 rv = esp_inbound_accelerated(ipsec_in_mp, 1272 data_mp, ii->ipsec_in_v4, ipsa); 1273 return (rv); 1274 } 1275 ESP_BUMP_STAT(espstack, noaccel); 1276 1277 /* 1278 * Adjust the IP header's payload length to reflect the removal 1279 * of the ICV. 1280 */ 1281 if (!ii->ipsec_in_v4) { 1282 ip6_t *ip6h = (ip6_t *)data_mp->b_rptr; 1283 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) - 1284 ipsa->ipsa_mac_len); 1285 } else { 1286 ipha_t *ipha = (ipha_t *)data_mp->b_rptr; 1287 ipha->ipha_length = htons(ntohs(ipha->ipha_length) - 1288 ipsa->ipsa_mac_len); 1289 } 1290 1291 /* submit the request to the crypto framework */ 1292 return (esp_submit_req_inbound(ipsec_in_mp, ipsa, 1293 (uint8_t *)esph - data_mp->b_rptr)); 1294 } 1295 1296 /* 1297 * Perform the really difficult work of inserting the proposed situation. 1298 * Called while holding the algorithm lock. 1299 */ 1300 static void 1301 esp_insert_prop(sadb_prop_t *prop, ipsacq_t *acqrec, uint_t combs) 1302 { 1303 sadb_comb_t *comb = (sadb_comb_t *)(prop + 1); 1304 ipsec_out_t *io; 1305 ipsec_action_t *ap; 1306 ipsec_prot_t *prot; 1307 netstack_t *ns; 1308 ipsecesp_stack_t *espstack; 1309 ipsec_stack_t *ipss; 1310 1311 io = (ipsec_out_t *)acqrec->ipsacq_mp->b_rptr; 1312 ASSERT(io->ipsec_out_type == IPSEC_OUT); 1313 ns = io->ipsec_out_ns; 1314 espstack = ns->netstack_ipsecesp; 1315 ipss = ns->netstack_ipsec; 1316 ASSERT(MUTEX_HELD(&ipss->ipsec_alg_lock)); 1317 1318 prop->sadb_prop_exttype = SADB_EXT_PROPOSAL; 1319 prop->sadb_prop_len = SADB_8TO64(sizeof (sadb_prop_t)); 1320 *(uint32_t *)(&prop->sadb_prop_replay) = 0; /* Quick zero-out! */ 1321 1322 prop->sadb_prop_replay = espstack->ipsecesp_replay_size; 1323 1324 /* 1325 * Based upon algorithm properties, and what-not, prioritize 1326 * a proposal. If the IPSEC_OUT message has an algorithm specified, 1327 * use it first and foremost. 1328 * 1329 * For each action in policy list 1330 * Add combination. If I've hit limit, return. 1331 */ 1332 1333 for (ap = acqrec->ipsacq_act; ap != NULL; 1334 ap = ap->ipa_next) { 1335 ipsec_alginfo_t *ealg = NULL; 1336 ipsec_alginfo_t *aalg = NULL; 1337 1338 if (ap->ipa_act.ipa_type != IPSEC_POLICY_APPLY) 1339 continue; 1340 1341 prot = &ap->ipa_act.ipa_apply; 1342 1343 if (!(prot->ipp_use_esp)) 1344 continue; 1345 1346 if (prot->ipp_esp_auth_alg != 0) { 1347 aalg = ipss->ipsec_alglists[IPSEC_ALG_AUTH] 1348 [prot->ipp_esp_auth_alg]; 1349 if (aalg == NULL || !ALG_VALID(aalg)) 1350 continue; 1351 } 1352 1353 ASSERT(prot->ipp_encr_alg > 0); 1354 ealg = ipss->ipsec_alglists[IPSEC_ALG_ENCR] 1355 [prot->ipp_encr_alg]; 1356 if (ealg == NULL || !ALG_VALID(ealg)) 1357 continue; 1358 1359 comb->sadb_comb_flags = 0; 1360 comb->sadb_comb_reserved = 0; 1361 comb->sadb_comb_encrypt = ealg->alg_id; 1362 comb->sadb_comb_encrypt_minbits = 1363 MAX(prot->ipp_espe_minbits, ealg->alg_ef_minbits); 1364 comb->sadb_comb_encrypt_maxbits = 1365 MIN(prot->ipp_espe_maxbits, ealg->alg_ef_maxbits); 1366 if (aalg == NULL) { 1367 comb->sadb_comb_auth = 0; 1368 comb->sadb_comb_auth_minbits = 0; 1369 comb->sadb_comb_auth_maxbits = 0; 1370 } else { 1371 comb->sadb_comb_auth = aalg->alg_id; 1372 comb->sadb_comb_auth_minbits = 1373 MAX(prot->ipp_espa_minbits, aalg->alg_ef_minbits); 1374 comb->sadb_comb_auth_maxbits = 1375 MIN(prot->ipp_espa_maxbits, aalg->alg_ef_maxbits); 1376 } 1377 1378 /* 1379 * The following may be based on algorithm 1380 * properties, but in the meantime, we just pick 1381 * some good, sensible numbers. Key mgmt. can 1382 * (and perhaps should) be the place to finalize 1383 * such decisions. 1384 */ 1385 1386 /* 1387 * No limits on allocations, since we really don't 1388 * support that concept currently. 1389 */ 1390 comb->sadb_comb_soft_allocations = 0; 1391 comb->sadb_comb_hard_allocations = 0; 1392 1393 /* 1394 * These may want to come from policy rule.. 1395 */ 1396 comb->sadb_comb_soft_bytes = 1397 espstack->ipsecesp_default_soft_bytes; 1398 comb->sadb_comb_hard_bytes = 1399 espstack->ipsecesp_default_hard_bytes; 1400 comb->sadb_comb_soft_addtime = 1401 espstack->ipsecesp_default_soft_addtime; 1402 comb->sadb_comb_hard_addtime = 1403 espstack->ipsecesp_default_hard_addtime; 1404 comb->sadb_comb_soft_usetime = 1405 espstack->ipsecesp_default_soft_usetime; 1406 comb->sadb_comb_hard_usetime = 1407 espstack->ipsecesp_default_hard_usetime; 1408 1409 prop->sadb_prop_len += SADB_8TO64(sizeof (*comb)); 1410 if (--combs == 0) 1411 break; /* out of space.. */ 1412 comb++; 1413 } 1414 } 1415 1416 /* 1417 * Prepare and actually send the SADB_ACQUIRE message to PF_KEY. 1418 */ 1419 static void 1420 esp_send_acquire(ipsacq_t *acqrec, mblk_t *extended, netstack_t *ns) 1421 { 1422 uint_t combs; 1423 sadb_msg_t *samsg; 1424 sadb_prop_t *prop; 1425 mblk_t *pfkeymp, *msgmp; 1426 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 1427 ipsec_stack_t *ipss = ns->netstack_ipsec; 1428 1429 ESP_BUMP_STAT(espstack, acquire_requests); 1430 1431 if (espstack->esp_pfkey_q == NULL) 1432 return; 1433 1434 /* Set up ACQUIRE. */ 1435 pfkeymp = sadb_setup_acquire(acqrec, SADB_SATYPE_ESP, 1436 ns->netstack_ipsec); 1437 if (pfkeymp == NULL) { 1438 esp0dbg(("sadb_setup_acquire failed.\n")); 1439 return; 1440 } 1441 ASSERT(MUTEX_HELD(&ipss->ipsec_alg_lock)); 1442 combs = ipss->ipsec_nalgs[IPSEC_ALG_AUTH] * 1443 ipss->ipsec_nalgs[IPSEC_ALG_ENCR]; 1444 msgmp = pfkeymp->b_cont; 1445 samsg = (sadb_msg_t *)(msgmp->b_rptr); 1446 1447 /* Insert proposal here. */ 1448 1449 prop = (sadb_prop_t *)(((uint64_t *)samsg) + samsg->sadb_msg_len); 1450 esp_insert_prop(prop, acqrec, combs); 1451 samsg->sadb_msg_len += prop->sadb_prop_len; 1452 msgmp->b_wptr += SADB_64TO8(samsg->sadb_msg_len); 1453 1454 mutex_exit(&ipss->ipsec_alg_lock); 1455 1456 /* 1457 * Must mutex_exit() before sending PF_KEY message up, in 1458 * order to avoid recursive mutex_enter() if there are no registered 1459 * listeners. 1460 * 1461 * Once I've sent the message, I'm cool anyway. 1462 */ 1463 mutex_exit(&acqrec->ipsacq_lock); 1464 if (extended != NULL) { 1465 putnext(espstack->esp_pfkey_q, extended); 1466 } 1467 putnext(espstack->esp_pfkey_q, pfkeymp); 1468 } 1469 1470 /* 1471 * Handle the SADB_GETSPI message. Create a larval SA. 1472 */ 1473 static void 1474 esp_getspi(mblk_t *mp, keysock_in_t *ksi, ipsecesp_stack_t *espstack) 1475 { 1476 ipsa_t *newbie, *target; 1477 isaf_t *outbound, *inbound; 1478 int rc, diagnostic; 1479 sadb_sa_t *assoc; 1480 keysock_out_t *kso; 1481 uint32_t newspi; 1482 1483 /* 1484 * Randomly generate a proposed SPI value 1485 */ 1486 (void) random_get_pseudo_bytes((uint8_t *)&newspi, sizeof (uint32_t)); 1487 newbie = sadb_getspi(ksi, newspi, &diagnostic, 1488 espstack->ipsecesp_netstack); 1489 1490 if (newbie == NULL) { 1491 sadb_pfkey_error(espstack->esp_pfkey_q, mp, ENOMEM, diagnostic, 1492 ksi->ks_in_serial); 1493 return; 1494 } else if (newbie == (ipsa_t *)-1) { 1495 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EINVAL, diagnostic, 1496 ksi->ks_in_serial); 1497 return; 1498 } 1499 1500 /* 1501 * XXX - We may randomly collide. We really should recover from this. 1502 * Unfortunately, that could require spending way-too-much-time 1503 * in here. For now, let the user retry. 1504 */ 1505 1506 if (newbie->ipsa_addrfam == AF_INET6) { 1507 outbound = OUTBOUND_BUCKET_V6(&espstack->esp_sadb.s_v6, 1508 *(uint32_t *)(newbie->ipsa_dstaddr)); 1509 inbound = INBOUND_BUCKET(&espstack->esp_sadb.s_v6, 1510 newbie->ipsa_spi); 1511 } else { 1512 ASSERT(newbie->ipsa_addrfam == AF_INET); 1513 outbound = OUTBOUND_BUCKET_V4(&espstack->esp_sadb.s_v4, 1514 *(uint32_t *)(newbie->ipsa_dstaddr)); 1515 inbound = INBOUND_BUCKET(&espstack->esp_sadb.s_v4, 1516 newbie->ipsa_spi); 1517 } 1518 1519 mutex_enter(&outbound->isaf_lock); 1520 mutex_enter(&inbound->isaf_lock); 1521 1522 /* 1523 * Check for collisions (i.e. did sadb_getspi() return with something 1524 * that already exists?). 1525 * 1526 * Try outbound first. Even though SADB_GETSPI is traditionally 1527 * for inbound SAs, you never know what a user might do. 1528 */ 1529 target = ipsec_getassocbyspi(outbound, newbie->ipsa_spi, 1530 newbie->ipsa_srcaddr, newbie->ipsa_dstaddr, newbie->ipsa_addrfam); 1531 if (target == NULL) { 1532 target = ipsec_getassocbyspi(inbound, newbie->ipsa_spi, 1533 newbie->ipsa_srcaddr, newbie->ipsa_dstaddr, 1534 newbie->ipsa_addrfam); 1535 } 1536 1537 /* 1538 * I don't have collisions elsewhere! 1539 * (Nor will I because I'm still holding inbound/outbound locks.) 1540 */ 1541 1542 if (target != NULL) { 1543 rc = EEXIST; 1544 IPSA_REFRELE(target); 1545 } else { 1546 /* 1547 * sadb_insertassoc() also checks for collisions, so 1548 * if there's a colliding entry, rc will be set 1549 * to EEXIST. 1550 */ 1551 rc = sadb_insertassoc(newbie, inbound); 1552 newbie->ipsa_hardexpiretime = gethrestime_sec(); 1553 newbie->ipsa_hardexpiretime += 1554 espstack->ipsecesp_larval_timeout; 1555 } 1556 1557 /* 1558 * Can exit outbound mutex. Hold inbound until we're done 1559 * with newbie. 1560 */ 1561 mutex_exit(&outbound->isaf_lock); 1562 1563 if (rc != 0) { 1564 mutex_exit(&inbound->isaf_lock); 1565 IPSA_REFRELE(newbie); 1566 sadb_pfkey_error(espstack->esp_pfkey_q, mp, rc, 1567 SADB_X_DIAGNOSTIC_NONE, ksi->ks_in_serial); 1568 return; 1569 } 1570 1571 1572 /* Can write here because I'm still holding the bucket lock. */ 1573 newbie->ipsa_type = SADB_SATYPE_ESP; 1574 1575 /* 1576 * Construct successful return message. We have one thing going 1577 * for us in PF_KEY v2. That's the fact that 1578 * sizeof (sadb_spirange_t) == sizeof (sadb_sa_t) 1579 */ 1580 assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SPIRANGE]; 1581 assoc->sadb_sa_exttype = SADB_EXT_SA; 1582 assoc->sadb_sa_spi = newbie->ipsa_spi; 1583 *((uint64_t *)(&assoc->sadb_sa_replay)) = 0; 1584 mutex_exit(&inbound->isaf_lock); 1585 1586 /* Convert KEYSOCK_IN to KEYSOCK_OUT. */ 1587 kso = (keysock_out_t *)ksi; 1588 kso->ks_out_len = sizeof (*kso); 1589 kso->ks_out_serial = ksi->ks_in_serial; 1590 kso->ks_out_type = KEYSOCK_OUT; 1591 1592 /* 1593 * Can safely putnext() to esp_pfkey_q, because this is a turnaround 1594 * from the esp_pfkey_q. 1595 */ 1596 putnext(espstack->esp_pfkey_q, mp); 1597 } 1598 1599 /* 1600 * Insert the ESP header into a packet. Duplicate an mblk, and insert a newly 1601 * allocated mblk with the ESP header in between the two. 1602 */ 1603 static boolean_t 1604 esp_insert_esp(mblk_t *mp, mblk_t *esp_mp, uint_t divpoint, 1605 ipsecesp_stack_t *espstack) 1606 { 1607 mblk_t *split_mp = mp; 1608 uint_t wheretodiv = divpoint; 1609 1610 while ((split_mp->b_wptr - split_mp->b_rptr) < wheretodiv) { 1611 wheretodiv -= (split_mp->b_wptr - split_mp->b_rptr); 1612 split_mp = split_mp->b_cont; 1613 ASSERT(split_mp != NULL); 1614 } 1615 1616 if (split_mp->b_wptr - split_mp->b_rptr != wheretodiv) { 1617 mblk_t *scratch; 1618 1619 /* "scratch" is the 2nd half, split_mp is the first. */ 1620 scratch = dupb(split_mp); 1621 if (scratch == NULL) { 1622 esp1dbg(espstack, 1623 ("esp_insert_esp: can't allocate scratch.\n")); 1624 return (B_FALSE); 1625 } 1626 /* NOTE: dupb() doesn't set b_cont appropriately. */ 1627 scratch->b_cont = split_mp->b_cont; 1628 scratch->b_rptr += wheretodiv; 1629 split_mp->b_wptr = split_mp->b_rptr + wheretodiv; 1630 split_mp->b_cont = scratch; 1631 } 1632 /* 1633 * At this point, split_mp is exactly "wheretodiv" bytes long, and 1634 * holds the end of the pre-ESP part of the datagram. 1635 */ 1636 esp_mp->b_cont = split_mp->b_cont; 1637 split_mp->b_cont = esp_mp; 1638 1639 return (B_TRUE); 1640 } 1641 1642 /* 1643 * Finish processing of an inbound ESP packet after processing by the 1644 * crypto framework. 1645 * - Remove the ESP header. 1646 * - Send packet back to IP. 1647 * If authentication was performed on the packet, this function is called 1648 * only if the authentication succeeded. 1649 * On success returns B_TRUE, on failure returns B_FALSE and frees the 1650 * mblk chain ipsec_in_mp. 1651 */ 1652 static ipsec_status_t 1653 esp_in_done(mblk_t *ipsec_in_mp) 1654 { 1655 ipsec_in_t *ii = (ipsec_in_t *)ipsec_in_mp->b_rptr; 1656 mblk_t *data_mp; 1657 ipsa_t *assoc; 1658 uint_t espstart; 1659 uint32_t ivlen = 0; 1660 uint_t processed_len; 1661 esph_t *esph; 1662 kstat_named_t *counter; 1663 boolean_t is_natt; 1664 netstack_t *ns = ii->ipsec_in_ns; 1665 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 1666 ipsec_stack_t *ipss = ns->netstack_ipsec; 1667 1668 assoc = ii->ipsec_in_esp_sa; 1669 ASSERT(assoc != NULL); 1670 1671 is_natt = ((assoc->ipsa_flags & IPSA_F_NATT) != 0); 1672 1673 /* get the pointer to the ESP header */ 1674 if (assoc->ipsa_encr_alg == SADB_EALG_NULL) { 1675 /* authentication-only ESP */ 1676 espstart = ii->ipsec_in_crypto_data.cd_offset; 1677 processed_len = ii->ipsec_in_crypto_data.cd_length; 1678 } else { 1679 /* encryption present */ 1680 ivlen = assoc->ipsa_iv_len; 1681 if (assoc->ipsa_auth_alg == SADB_AALG_NONE) { 1682 /* encryption-only ESP */ 1683 espstart = ii->ipsec_in_crypto_data.cd_offset - 1684 sizeof (esph_t) - assoc->ipsa_iv_len; 1685 processed_len = ii->ipsec_in_crypto_data.cd_length + 1686 ivlen; 1687 } else { 1688 /* encryption with authentication */ 1689 espstart = ii->ipsec_in_crypto_dual_data.dd_offset1; 1690 processed_len = ii->ipsec_in_crypto_dual_data.dd_len2 + 1691 ivlen; 1692 } 1693 } 1694 1695 data_mp = ipsec_in_mp->b_cont; 1696 esph = (esph_t *)(data_mp->b_rptr + espstart); 1697 1698 if (assoc->ipsa_auth_alg != IPSA_AALG_NONE) { 1699 /* authentication passed if we reach this point */ 1700 ESP_BUMP_STAT(espstack, good_auth); 1701 data_mp->b_wptr -= assoc->ipsa_mac_len; 1702 1703 /* 1704 * Check replay window here! 1705 * For right now, assume keysock will set the replay window 1706 * size to zero for SAs that have an unspecified sender. 1707 * This may change... 1708 */ 1709 1710 if (!sadb_replay_check(assoc, esph->esph_replay)) { 1711 /* 1712 * Log the event. As of now we print out an event. 1713 * Do not print the replay failure number, or else 1714 * syslog cannot collate the error messages. Printing 1715 * the replay number that failed opens a denial-of- 1716 * service attack. 1717 */ 1718 ipsec_assocfailure(info.mi_idnum, 0, 0, 1719 SL_ERROR | SL_WARN, 1720 "Replay failed for ESP spi 0x%x, dst %s.\n", 1721 assoc->ipsa_spi, assoc->ipsa_dstaddr, 1722 assoc->ipsa_addrfam, espstack->ipsecesp_netstack); 1723 ESP_BUMP_STAT(espstack, replay_failures); 1724 counter = DROPPER(ipss, ipds_esp_replay); 1725 goto drop_and_bail; 1726 } 1727 } 1728 1729 esp_set_usetime(assoc, B_TRUE); 1730 1731 if (!esp_age_bytes(assoc, processed_len, B_TRUE)) { 1732 /* The ipsa has hit hard expiration, LOG and AUDIT. */ 1733 ipsec_assocfailure(info.mi_idnum, 0, 0, 1734 SL_ERROR | SL_WARN, 1735 "ESP association 0x%x, dst %s had bytes expire.\n", 1736 assoc->ipsa_spi, assoc->ipsa_dstaddr, assoc->ipsa_addrfam, 1737 espstack->ipsecesp_netstack); 1738 ESP_BUMP_STAT(espstack, bytes_expired); 1739 counter = DROPPER(ipss, ipds_esp_bytes_expire); 1740 goto drop_and_bail; 1741 } 1742 1743 /* 1744 * Remove ESP header and padding from packet. I hope the compiler 1745 * spews "branch, predict taken" code for this. 1746 */ 1747 1748 if (esp_strip_header(data_mp, ii->ipsec_in_v4, ivlen, &counter, 1749 espstack)) { 1750 if (is_natt) 1751 return (esp_fix_natt_checksums(data_mp, assoc)); 1752 return (IPSEC_STATUS_SUCCESS); 1753 } 1754 1755 esp1dbg(espstack, ("esp_in_done: esp_strip_header() failed\n")); 1756 drop_and_bail: 1757 IP_ESP_BUMP_STAT(ipss, in_discards); 1758 /* 1759 * TODO: Extract inbound interface from the IPSEC_IN message's 1760 * ii->ipsec_in_rill_index. 1761 */ 1762 ip_drop_packet(ipsec_in_mp, B_TRUE, NULL, NULL, counter, 1763 &espstack->esp_dropper); 1764 return (IPSEC_STATUS_FAILED); 1765 } 1766 1767 /* 1768 * Called upon failing the inbound ICV check. The message passed as 1769 * argument is freed. 1770 */ 1771 static void 1772 esp_log_bad_auth(mblk_t *ipsec_in) 1773 { 1774 ipsec_in_t *ii = (ipsec_in_t *)ipsec_in->b_rptr; 1775 ipsa_t *assoc = ii->ipsec_in_esp_sa; 1776 netstack_t *ns = ii->ipsec_in_ns; 1777 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 1778 ipsec_stack_t *ipss = ns->netstack_ipsec; 1779 1780 /* 1781 * Log the event. Don't print to the console, block 1782 * potential denial-of-service attack. 1783 */ 1784 ESP_BUMP_STAT(espstack, bad_auth); 1785 1786 ipsec_assocfailure(info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 1787 "ESP Authentication failed for spi 0x%x, dst %s.\n", 1788 assoc->ipsa_spi, assoc->ipsa_dstaddr, assoc->ipsa_addrfam, 1789 espstack->ipsecesp_netstack); 1790 1791 IP_ESP_BUMP_STAT(ipss, in_discards); 1792 /* 1793 * TODO: Extract inbound interface from the IPSEC_IN 1794 * message's ii->ipsec_in_rill_index. 1795 */ 1796 ip_drop_packet(ipsec_in, B_TRUE, NULL, NULL, 1797 DROPPER(ipss, ipds_esp_bad_auth), 1798 &espstack->esp_dropper); 1799 } 1800 1801 1802 /* 1803 * Invoked for outbound packets after ESP processing. If the packet 1804 * also requires AH, performs the AH SA selection and AH processing. 1805 * Returns B_TRUE if the AH processing was not needed or if it was 1806 * performed successfully. Returns B_FALSE and consumes the passed mblk 1807 * if AH processing was required but could not be performed. 1808 */ 1809 static boolean_t 1810 esp_do_outbound_ah(mblk_t *ipsec_mp) 1811 { 1812 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 1813 ipsec_status_t ipsec_rc; 1814 ipsec_action_t *ap; 1815 1816 ap = io->ipsec_out_act; 1817 if (ap == NULL) { 1818 ipsec_policy_t *pp = io->ipsec_out_policy; 1819 ap = pp->ipsp_act; 1820 } 1821 1822 if (!ap->ipa_want_ah) 1823 return (B_TRUE); 1824 1825 ASSERT(io->ipsec_out_ah_done == B_FALSE); 1826 1827 if (io->ipsec_out_ah_sa == NULL) { 1828 if (!ipsec_outbound_sa(ipsec_mp, IPPROTO_AH)) { 1829 sadb_acquire(ipsec_mp, io, B_TRUE, B_FALSE); 1830 return (B_FALSE); 1831 } 1832 } 1833 ASSERT(io->ipsec_out_ah_sa != NULL); 1834 1835 io->ipsec_out_ah_done = B_TRUE; 1836 ipsec_rc = io->ipsec_out_ah_sa->ipsa_output_func(ipsec_mp); 1837 return (ipsec_rc == IPSEC_STATUS_SUCCESS); 1838 } 1839 1840 1841 /* 1842 * Kernel crypto framework callback invoked after completion of async 1843 * crypto requests. 1844 */ 1845 static void 1846 esp_kcf_callback(void *arg, int status) 1847 { 1848 mblk_t *ipsec_mp = (mblk_t *)arg; 1849 ipsec_in_t *ii = (ipsec_in_t *)ipsec_mp->b_rptr; 1850 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 1851 boolean_t is_inbound = (ii->ipsec_in_type == IPSEC_IN); 1852 netstackid_t stackid; 1853 netstack_t *ns, *ns_arg; 1854 ipsecesp_stack_t *espstack; 1855 ipsec_stack_t *ipss; 1856 1857 ASSERT(ipsec_mp->b_cont != NULL); 1858 1859 if (is_inbound) { 1860 stackid = ii->ipsec_in_stackid; 1861 ns_arg = ii->ipsec_in_ns; 1862 } else { 1863 stackid = io->ipsec_out_stackid; 1864 ns_arg = io->ipsec_out_ns; 1865 } 1866 1867 /* 1868 * Verify that the netstack is still around; could have vanished 1869 * while kEf was doing its work. 1870 */ 1871 ns = netstack_find_by_stackid(stackid); 1872 if (ns == NULL || ns != ns_arg) { 1873 /* Disappeared on us */ 1874 if (ns != NULL) 1875 netstack_rele(ns); 1876 freemsg(ipsec_mp); 1877 return; 1878 } 1879 1880 espstack = ns->netstack_ipsecesp; 1881 ipss = ns->netstack_ipsec; 1882 1883 if (status == CRYPTO_SUCCESS) { 1884 if (is_inbound) { 1885 if (esp_in_done(ipsec_mp) != IPSEC_STATUS_SUCCESS) { 1886 netstack_rele(ns); 1887 return; 1888 } 1889 /* finish IPsec processing */ 1890 ip_fanout_proto_again(ipsec_mp, NULL, NULL, NULL); 1891 } else { 1892 /* 1893 * If a ICV was computed, it was stored by the 1894 * crypto framework at the end of the packet. 1895 */ 1896 ipha_t *ipha = (ipha_t *)ipsec_mp->b_cont->b_rptr; 1897 1898 esp_set_usetime(io->ipsec_out_esp_sa, B_FALSE); 1899 /* NAT-T packet. */ 1900 if (ipha->ipha_protocol == IPPROTO_UDP) 1901 esp_prepare_udp(ns, ipsec_mp->b_cont, ipha); 1902 1903 /* do AH processing if needed */ 1904 if (!esp_do_outbound_ah(ipsec_mp)) { 1905 netstack_rele(ns); 1906 return; 1907 } 1908 /* finish IPsec processing */ 1909 if (IPH_HDR_VERSION(ipha) == IP_VERSION) { 1910 ip_wput_ipsec_out(NULL, ipsec_mp, ipha, NULL, 1911 NULL); 1912 } else { 1913 ip6_t *ip6h = (ip6_t *)ipha; 1914 ip_wput_ipsec_out_v6(NULL, ipsec_mp, ip6h, 1915 NULL, NULL); 1916 } 1917 } 1918 1919 } else if (status == CRYPTO_INVALID_MAC) { 1920 esp_log_bad_auth(ipsec_mp); 1921 1922 } else { 1923 esp1dbg(espstack, 1924 ("esp_kcf_callback: crypto failed with 0x%x\n", 1925 status)); 1926 ESP_BUMP_STAT(espstack, crypto_failures); 1927 if (is_inbound) 1928 IP_ESP_BUMP_STAT(ipss, in_discards); 1929 else 1930 ESP_BUMP_STAT(espstack, out_discards); 1931 ip_drop_packet(ipsec_mp, is_inbound, NULL, NULL, 1932 DROPPER(ipss, ipds_esp_crypto_failed), 1933 &espstack->esp_dropper); 1934 } 1935 netstack_rele(ns); 1936 } 1937 1938 /* 1939 * Invoked on crypto framework failure during inbound and outbound processing. 1940 */ 1941 static void 1942 esp_crypto_failed(mblk_t *mp, boolean_t is_inbound, int kef_rc, 1943 ipsecesp_stack_t *espstack) 1944 { 1945 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 1946 1947 esp1dbg(espstack, ("crypto failed for %s ESP with 0x%x\n", 1948 is_inbound ? "inbound" : "outbound", kef_rc)); 1949 ip_drop_packet(mp, is_inbound, NULL, NULL, 1950 DROPPER(ipss, ipds_esp_crypto_failed), 1951 &espstack->esp_dropper); 1952 ESP_BUMP_STAT(espstack, crypto_failures); 1953 if (is_inbound) 1954 IP_ESP_BUMP_STAT(ipss, in_discards); 1955 else 1956 ESP_BUMP_STAT(espstack, out_discards); 1957 } 1958 1959 #define ESP_INIT_CALLREQ(_cr) { \ 1960 (_cr)->cr_flag = CRYPTO_SKIP_REQID|CRYPTO_RESTRICTED; \ 1961 (_cr)->cr_callback_arg = ipsec_mp; \ 1962 (_cr)->cr_callback_func = esp_kcf_callback; \ 1963 } 1964 1965 #define ESP_INIT_CRYPTO_MAC(mac, icvlen, icvbuf) { \ 1966 (mac)->cd_format = CRYPTO_DATA_RAW; \ 1967 (mac)->cd_offset = 0; \ 1968 (mac)->cd_length = icvlen; \ 1969 (mac)->cd_raw.iov_base = (char *)icvbuf; \ 1970 (mac)->cd_raw.iov_len = icvlen; \ 1971 } 1972 1973 #define ESP_INIT_CRYPTO_DATA(data, mp, off, len) { \ 1974 if (MBLKL(mp) >= (len) + (off)) { \ 1975 (data)->cd_format = CRYPTO_DATA_RAW; \ 1976 (data)->cd_raw.iov_base = (char *)(mp)->b_rptr; \ 1977 (data)->cd_raw.iov_len = MBLKL(mp); \ 1978 (data)->cd_offset = off; \ 1979 } else { \ 1980 (data)->cd_format = CRYPTO_DATA_MBLK; \ 1981 (data)->cd_mp = mp; \ 1982 (data)->cd_offset = off; \ 1983 } \ 1984 (data)->cd_length = len; \ 1985 } 1986 1987 #define ESP_INIT_CRYPTO_DUAL_DATA(data, mp, off1, len1, off2, len2) { \ 1988 (data)->dd_format = CRYPTO_DATA_MBLK; \ 1989 (data)->dd_mp = mp; \ 1990 (data)->dd_len1 = len1; \ 1991 (data)->dd_offset1 = off1; \ 1992 (data)->dd_len2 = len2; \ 1993 (data)->dd_offset2 = off2; \ 1994 } 1995 1996 static ipsec_status_t 1997 esp_submit_req_inbound(mblk_t *ipsec_mp, ipsa_t *assoc, uint_t esph_offset) 1998 { 1999 ipsec_in_t *ii = (ipsec_in_t *)ipsec_mp->b_rptr; 2000 boolean_t do_auth; 2001 uint_t auth_offset, msg_len, auth_len; 2002 crypto_call_req_t call_req; 2003 mblk_t *esp_mp; 2004 int kef_rc = CRYPTO_FAILED; 2005 uint_t icv_len = assoc->ipsa_mac_len; 2006 crypto_ctx_template_t auth_ctx_tmpl; 2007 boolean_t do_encr; 2008 uint_t encr_offset, encr_len; 2009 uint_t iv_len = assoc->ipsa_iv_len; 2010 crypto_ctx_template_t encr_ctx_tmpl; 2011 netstack_t *ns = ii->ipsec_in_ns; 2012 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 2013 ipsec_stack_t *ipss = ns->netstack_ipsec; 2014 2015 ASSERT(ii->ipsec_in_type == IPSEC_IN); 2016 2017 /* 2018 * In case kEF queues and calls back, keep netstackid_t for 2019 * verification that the IP instance is still around in 2020 * esp_kcf_callback(). 2021 */ 2022 ii->ipsec_in_stackid = ns->netstack_stackid; 2023 2024 do_auth = assoc->ipsa_auth_alg != SADB_AALG_NONE; 2025 do_encr = assoc->ipsa_encr_alg != SADB_EALG_NULL; 2026 2027 /* 2028 * An inbound packet is of the form: 2029 * IPSEC_IN -> [IP,options,ESP,IV,data,ICV,pad] 2030 */ 2031 esp_mp = ipsec_mp->b_cont; 2032 msg_len = MBLKL(esp_mp); 2033 2034 ESP_INIT_CALLREQ(&call_req); 2035 2036 if (do_auth) { 2037 /* force asynchronous processing? */ 2038 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_AUTH] == 2039 IPSEC_ALGS_EXEC_ASYNC) 2040 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2041 2042 /* authentication context template */ 2043 IPSEC_CTX_TMPL(assoc, ipsa_authtmpl, IPSEC_ALG_AUTH, 2044 auth_ctx_tmpl); 2045 2046 /* ICV to be verified */ 2047 ESP_INIT_CRYPTO_MAC(&ii->ipsec_in_crypto_mac, 2048 icv_len, esp_mp->b_wptr - icv_len); 2049 2050 /* authentication starts at the ESP header */ 2051 auth_offset = esph_offset; 2052 auth_len = msg_len - auth_offset - icv_len; 2053 if (!do_encr) { 2054 /* authentication only */ 2055 /* initialize input data argument */ 2056 ESP_INIT_CRYPTO_DATA(&ii->ipsec_in_crypto_data, 2057 esp_mp, auth_offset, auth_len); 2058 2059 /* call the crypto framework */ 2060 kef_rc = crypto_mac_verify(&assoc->ipsa_amech, 2061 &ii->ipsec_in_crypto_data, 2062 &assoc->ipsa_kcfauthkey, auth_ctx_tmpl, 2063 &ii->ipsec_in_crypto_mac, &call_req); 2064 } 2065 } 2066 2067 if (do_encr) { 2068 /* force asynchronous processing? */ 2069 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_ENCR] == 2070 IPSEC_ALGS_EXEC_ASYNC) 2071 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2072 2073 /* encryption template */ 2074 IPSEC_CTX_TMPL(assoc, ipsa_encrtmpl, IPSEC_ALG_ENCR, 2075 encr_ctx_tmpl); 2076 2077 /* skip IV, since it is passed separately */ 2078 encr_offset = esph_offset + sizeof (esph_t) + iv_len; 2079 encr_len = msg_len - encr_offset; 2080 2081 if (!do_auth) { 2082 /* decryption only */ 2083 /* initialize input data argument */ 2084 ESP_INIT_CRYPTO_DATA(&ii->ipsec_in_crypto_data, 2085 esp_mp, encr_offset, encr_len); 2086 2087 /* specify IV */ 2088 ii->ipsec_in_crypto_data.cd_miscdata = 2089 (char *)esp_mp->b_rptr + sizeof (esph_t) + 2090 esph_offset; 2091 2092 /* call the crypto framework */ 2093 kef_rc = crypto_decrypt(&assoc->ipsa_emech, 2094 &ii->ipsec_in_crypto_data, 2095 &assoc->ipsa_kcfencrkey, encr_ctx_tmpl, 2096 NULL, &call_req); 2097 } 2098 } 2099 2100 if (do_auth && do_encr) { 2101 /* dual operation */ 2102 /* initialize input data argument */ 2103 ESP_INIT_CRYPTO_DUAL_DATA(&ii->ipsec_in_crypto_dual_data, 2104 esp_mp, auth_offset, auth_len, 2105 encr_offset, encr_len - icv_len); 2106 2107 /* specify IV */ 2108 ii->ipsec_in_crypto_dual_data.dd_miscdata = 2109 (char *)esp_mp->b_rptr + sizeof (esph_t) + esph_offset; 2110 2111 /* call the framework */ 2112 kef_rc = crypto_mac_verify_decrypt(&assoc->ipsa_amech, 2113 &assoc->ipsa_emech, &ii->ipsec_in_crypto_dual_data, 2114 &assoc->ipsa_kcfauthkey, &assoc->ipsa_kcfencrkey, 2115 auth_ctx_tmpl, encr_ctx_tmpl, &ii->ipsec_in_crypto_mac, 2116 NULL, &call_req); 2117 } 2118 2119 switch (kef_rc) { 2120 case CRYPTO_SUCCESS: 2121 ESP_BUMP_STAT(espstack, crypto_sync); 2122 return (esp_in_done(ipsec_mp)); 2123 case CRYPTO_QUEUED: 2124 /* esp_kcf_callback() will be invoked on completion */ 2125 ESP_BUMP_STAT(espstack, crypto_async); 2126 return (IPSEC_STATUS_PENDING); 2127 case CRYPTO_INVALID_MAC: 2128 ESP_BUMP_STAT(espstack, crypto_sync); 2129 esp_log_bad_auth(ipsec_mp); 2130 return (IPSEC_STATUS_FAILED); 2131 } 2132 2133 esp_crypto_failed(ipsec_mp, B_TRUE, kef_rc, espstack); 2134 return (IPSEC_STATUS_FAILED); 2135 } 2136 2137 /* 2138 * Compute the IP and UDP checksums -- common code for both keepalives and 2139 * actual ESP-in-UDP packets. Be flexible with multiple mblks because ESP 2140 * uses mblk-insertion to insert the UDP header. 2141 * TODO - If there is an easy way to prep a packet for HW checksums, make 2142 * it happen here. 2143 */ 2144 static void 2145 esp_prepare_udp(netstack_t *ns, mblk_t *mp, ipha_t *ipha) 2146 { 2147 int offset; 2148 uint32_t cksum; 2149 uint16_t *arr; 2150 mblk_t *udpmp = mp; 2151 2152 ASSERT(MBLKL(mp) >= sizeof (ipha_t)); 2153 2154 ipha->ipha_hdr_checksum = 0; 2155 ipha->ipha_hdr_checksum = ip_csum_hdr(ipha); 2156 2157 if (ns->netstack_udp->us_do_checksum) { 2158 ASSERT(MBLKL(udpmp) >= sizeof (udpha_t)); 2159 /* arr points to the IP header. */ 2160 arr = (uint16_t *)ipha; 2161 IP_STAT(ns->netstack_ip, ip_out_sw_cksum); 2162 IP_STAT_UPDATE(ns->netstack_ip, ip_udp_out_sw_cksum_bytes, 2163 ntohs(htons(ipha->ipha_length) - IP_SIMPLE_HDR_LENGTH)); 2164 /* arr[6-9] are the IP addresses. */ 2165 cksum = IP_UDP_CSUM_COMP + arr[6] + arr[7] + arr[8] + arr[9] + 2166 ntohs(htons(ipha->ipha_length) - IP_SIMPLE_HDR_LENGTH); 2167 cksum = IP_CSUM(mp, IP_SIMPLE_HDR_LENGTH, cksum); 2168 offset = IP_SIMPLE_HDR_LENGTH + UDP_CHECKSUM_OFFSET; 2169 while (offset >= MBLKL(udpmp)) { 2170 offset -= MBLKL(udpmp); 2171 udpmp = udpmp->b_cont; 2172 } 2173 /* arr points to the UDP header's checksum field. */ 2174 arr = (uint16_t *)(udpmp->b_rptr + offset); 2175 *arr = cksum; 2176 } 2177 } 2178 2179 /* 2180 * Send a one-byte UDP NAT-T keepalive. Construct an IPSEC_OUT too that'll 2181 * get fed into esp_send_udp/ip_wput_ipsec_out. 2182 */ 2183 void 2184 ipsecesp_send_keepalive(ipsa_t *assoc) 2185 { 2186 mblk_t *mp = NULL, *ipsec_mp = NULL; 2187 ipha_t *ipha; 2188 udpha_t *udpha; 2189 ipsec_out_t *io; 2190 2191 ASSERT(!MUTEX_HELD(&assoc->ipsa_lock)); 2192 2193 mp = allocb(sizeof (ipha_t) + sizeof (udpha_t) + 1, BPRI_HI); 2194 if (mp == NULL) 2195 return; 2196 ipha = (ipha_t *)mp->b_rptr; 2197 ipha->ipha_version_and_hdr_length = IP_SIMPLE_HDR_VERSION; 2198 ipha->ipha_type_of_service = 0; 2199 ipha->ipha_length = htons(sizeof (ipha_t) + sizeof (udpha_t) + 1); 2200 /* Use the low-16 of the SPI so we have some clue where it came from. */ 2201 ipha->ipha_ident = *(((uint16_t *)(&assoc->ipsa_spi)) + 1); 2202 ipha->ipha_fragment_offset_and_flags = 0; /* Too small to fragment! */ 2203 ipha->ipha_ttl = 0xFF; 2204 ipha->ipha_protocol = IPPROTO_UDP; 2205 ipha->ipha_hdr_checksum = 0; 2206 ipha->ipha_src = assoc->ipsa_srcaddr[0]; 2207 ipha->ipha_dst = assoc->ipsa_dstaddr[0]; 2208 udpha = (udpha_t *)(ipha + 1); 2209 udpha->uha_src_port = (assoc->ipsa_local_nat_port != 0) ? 2210 assoc->ipsa_local_nat_port : htons(IPPORT_IKE_NATT); 2211 udpha->uha_dst_port = (assoc->ipsa_remote_nat_port != 0) ? 2212 assoc->ipsa_remote_nat_port : htons(IPPORT_IKE_NATT); 2213 udpha->uha_length = htons(sizeof (udpha_t) + 1); 2214 udpha->uha_checksum = 0; 2215 mp->b_wptr = (uint8_t *)(udpha + 1); 2216 *(mp->b_wptr++) = 0xFF; 2217 2218 ipsec_mp = ipsec_alloc_ipsec_out(assoc->ipsa_netstack); 2219 if (ipsec_mp == NULL) { 2220 freeb(mp); 2221 return; 2222 } 2223 ipsec_mp->b_cont = mp; 2224 io = (ipsec_out_t *)ipsec_mp->b_rptr; 2225 io->ipsec_out_zoneid = 2226 netstackid_to_zoneid(assoc->ipsa_netstack->netstack_stackid); 2227 2228 esp_prepare_udp(assoc->ipsa_netstack, mp, ipha); 2229 ip_wput_ipsec_out(NULL, ipsec_mp, ipha, NULL, NULL); 2230 } 2231 2232 static ipsec_status_t 2233 esp_submit_req_outbound(mblk_t *ipsec_mp, ipsa_t *assoc, uchar_t *icv_buf, 2234 uint_t payload_len) 2235 { 2236 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 2237 uint_t auth_len; 2238 crypto_call_req_t call_req; 2239 mblk_t *esp_mp; 2240 int kef_rc = CRYPTO_FAILED; 2241 uint_t icv_len = assoc->ipsa_mac_len; 2242 crypto_ctx_template_t auth_ctx_tmpl; 2243 boolean_t do_auth; 2244 boolean_t do_encr; 2245 uint_t iv_len = assoc->ipsa_iv_len; 2246 crypto_ctx_template_t encr_ctx_tmpl; 2247 boolean_t is_natt = ((assoc->ipsa_flags & IPSA_F_NATT) != 0); 2248 size_t esph_offset = (is_natt ? UDPH_SIZE : 0); 2249 netstack_t *ns = io->ipsec_out_ns; 2250 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 2251 ipsec_stack_t *ipss = ns->netstack_ipsec; 2252 2253 esp3dbg(espstack, ("esp_submit_req_outbound:%s", 2254 is_natt ? "natt" : "not natt")); 2255 2256 ASSERT(io->ipsec_out_type == IPSEC_OUT); 2257 2258 /* 2259 * In case kEF queues and calls back, keep netstackid_t for 2260 * verification that the IP instance is still around in 2261 * esp_kcf_callback(). 2262 */ 2263 io->ipsec_out_stackid = ns->netstack_stackid; 2264 2265 do_encr = assoc->ipsa_encr_alg != SADB_EALG_NULL; 2266 do_auth = assoc->ipsa_auth_alg != SADB_AALG_NONE; 2267 2268 /* 2269 * Outbound IPsec packets are of the form: 2270 * IPSEC_OUT -> [IP,options] -> [ESP,IV] -> [data] -> [pad,ICV] 2271 * unless it's NATT, then it's 2272 * IPSEC_OUT -> [IP,options] -> [udp][ESP,IV] -> [data] -> [pad,ICV] 2273 * Get a pointer to the mblk containing the ESP header. 2274 */ 2275 ASSERT(ipsec_mp->b_cont != NULL && ipsec_mp->b_cont->b_cont != NULL); 2276 esp_mp = ipsec_mp->b_cont->b_cont; 2277 2278 ESP_INIT_CALLREQ(&call_req); 2279 2280 if (do_auth) { 2281 /* force asynchronous processing? */ 2282 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_AUTH] == 2283 IPSEC_ALGS_EXEC_ASYNC) 2284 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2285 2286 /* authentication context template */ 2287 IPSEC_CTX_TMPL(assoc, ipsa_authtmpl, IPSEC_ALG_AUTH, 2288 auth_ctx_tmpl); 2289 2290 /* where to store the computed mac */ 2291 ESP_INIT_CRYPTO_MAC(&io->ipsec_out_crypto_mac, 2292 icv_len, icv_buf); 2293 2294 /* authentication starts at the ESP header */ 2295 auth_len = payload_len + iv_len + sizeof (esph_t); 2296 if (!do_encr) { 2297 /* authentication only */ 2298 /* initialize input data argument */ 2299 ESP_INIT_CRYPTO_DATA(&io->ipsec_out_crypto_data, 2300 esp_mp, esph_offset, auth_len); 2301 2302 /* call the crypto framework */ 2303 kef_rc = crypto_mac(&assoc->ipsa_amech, 2304 &io->ipsec_out_crypto_data, 2305 &assoc->ipsa_kcfauthkey, auth_ctx_tmpl, 2306 &io->ipsec_out_crypto_mac, &call_req); 2307 } 2308 } 2309 2310 if (do_encr) { 2311 /* force asynchronous processing? */ 2312 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_ENCR] == 2313 IPSEC_ALGS_EXEC_ASYNC) 2314 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2315 2316 /* encryption context template */ 2317 IPSEC_CTX_TMPL(assoc, ipsa_encrtmpl, IPSEC_ALG_ENCR, 2318 encr_ctx_tmpl); 2319 2320 if (!do_auth) { 2321 /* encryption only, skip mblk that contains ESP hdr */ 2322 /* initialize input data argument */ 2323 ESP_INIT_CRYPTO_DATA(&io->ipsec_out_crypto_data, 2324 esp_mp->b_cont, 0, payload_len); 2325 2326 /* specify IV */ 2327 io->ipsec_out_crypto_data.cd_miscdata = 2328 (char *)esp_mp->b_rptr + sizeof (esph_t) + 2329 esph_offset; 2330 2331 /* call the crypto framework */ 2332 kef_rc = crypto_encrypt(&assoc->ipsa_emech, 2333 &io->ipsec_out_crypto_data, 2334 &assoc->ipsa_kcfencrkey, encr_ctx_tmpl, 2335 NULL, &call_req); 2336 } 2337 } 2338 2339 if (do_auth && do_encr) { 2340 /* 2341 * Encryption and authentication: 2342 * Pass the pointer to the mblk chain starting at the ESP 2343 * header to the framework. Skip the ESP header mblk 2344 * for encryption, which is reflected by an encryption 2345 * offset equal to the length of that mblk. Start 2346 * the authentication at the ESP header, i.e. use an 2347 * authentication offset of zero. 2348 */ 2349 ESP_INIT_CRYPTO_DUAL_DATA(&io->ipsec_out_crypto_dual_data, 2350 esp_mp, MBLKL(esp_mp), payload_len, esph_offset, auth_len); 2351 2352 /* specify IV */ 2353 io->ipsec_out_crypto_dual_data.dd_miscdata = 2354 (char *)esp_mp->b_rptr + sizeof (esph_t) + esph_offset; 2355 2356 /* call the framework */ 2357 kef_rc = crypto_encrypt_mac(&assoc->ipsa_emech, 2358 &assoc->ipsa_amech, NULL, 2359 &assoc->ipsa_kcfencrkey, &assoc->ipsa_kcfauthkey, 2360 encr_ctx_tmpl, auth_ctx_tmpl, 2361 &io->ipsec_out_crypto_dual_data, 2362 &io->ipsec_out_crypto_mac, &call_req); 2363 } 2364 2365 switch (kef_rc) { 2366 case CRYPTO_SUCCESS: 2367 ESP_BUMP_STAT(espstack, crypto_sync); 2368 esp_set_usetime(assoc, B_FALSE); 2369 if (is_natt) 2370 esp_prepare_udp(ns, ipsec_mp->b_cont, 2371 (ipha_t *)ipsec_mp->b_cont->b_rptr); 2372 return (IPSEC_STATUS_SUCCESS); 2373 case CRYPTO_QUEUED: 2374 /* esp_kcf_callback() will be invoked on completion */ 2375 ESP_BUMP_STAT(espstack, crypto_async); 2376 return (IPSEC_STATUS_PENDING); 2377 } 2378 2379 esp_crypto_failed(ipsec_mp, B_TRUE, kef_rc, espstack); 2380 return (IPSEC_STATUS_FAILED); 2381 } 2382 2383 /* 2384 * Handle outbound IPsec processing for IPv4 and IPv6 2385 * On success returns B_TRUE, on failure returns B_FALSE and frees the 2386 * mblk chain ipsec_in_mp. 2387 */ 2388 static ipsec_status_t 2389 esp_outbound(mblk_t *mp) 2390 { 2391 mblk_t *ipsec_out_mp, *data_mp, *espmp, *tailmp; 2392 ipsec_out_t *io; 2393 ipha_t *ipha; 2394 ip6_t *ip6h; 2395 esph_t *esph; 2396 uint_t af; 2397 uint8_t *nhp; 2398 uintptr_t divpoint, datalen, adj, padlen, i, alloclen; 2399 uintptr_t esplen = sizeof (esph_t); 2400 uint8_t protocol; 2401 ipsa_t *assoc; 2402 uint_t iv_len, mac_len = 0; 2403 uchar_t *icv_buf; 2404 udpha_t *udpha; 2405 boolean_t is_natt = B_FALSE; 2406 netstack_t *ns; 2407 ipsecesp_stack_t *espstack; 2408 ipsec_stack_t *ipss; 2409 2410 ipsec_out_mp = mp; 2411 data_mp = ipsec_out_mp->b_cont; 2412 2413 io = (ipsec_out_t *)ipsec_out_mp->b_rptr; 2414 ns = io->ipsec_out_ns; 2415 espstack = ns->netstack_ipsecesp; 2416 ipss = ns->netstack_ipsec; 2417 2418 ESP_BUMP_STAT(espstack, out_requests); 2419 2420 /* 2421 * <sigh> We have to copy the message here, because TCP (for example) 2422 * keeps a dupb() of the message lying around for retransmission. 2423 * Since ESP changes the whole of the datagram, we have to create our 2424 * own copy lest we clobber TCP's data. Since we have to copy anyway, 2425 * we might as well make use of msgpullup() and get the mblk into one 2426 * contiguous piece! 2427 */ 2428 ipsec_out_mp->b_cont = msgpullup(data_mp, -1); 2429 if (ipsec_out_mp->b_cont == NULL) { 2430 esp0dbg(("esp_outbound: msgpullup() failed, " 2431 "dropping packet.\n")); 2432 ipsec_out_mp->b_cont = data_mp; 2433 /* 2434 * TODO: Find the outbound IRE for this packet and 2435 * pass it to ip_drop_packet(). 2436 */ 2437 ip_drop_packet(ipsec_out_mp, B_FALSE, NULL, NULL, 2438 DROPPER(ipss, ipds_esp_nomem), 2439 &espstack->esp_dropper); 2440 return (IPSEC_STATUS_FAILED); 2441 } else { 2442 freemsg(data_mp); 2443 data_mp = ipsec_out_mp->b_cont; 2444 } 2445 2446 /* 2447 * Reality check.... 2448 */ 2449 2450 ipha = (ipha_t *)data_mp->b_rptr; /* So we can call esp_acquire(). */ 2451 2452 if (io->ipsec_out_v4) { 2453 af = AF_INET; 2454 divpoint = IPH_HDR_LENGTH(ipha); 2455 datalen = ntohs(ipha->ipha_length) - divpoint; 2456 nhp = (uint8_t *)&ipha->ipha_protocol; 2457 } else { 2458 ip6_pkt_t ipp; 2459 2460 af = AF_INET6; 2461 ip6h = (ip6_t *)ipha; 2462 bzero(&ipp, sizeof (ipp)); 2463 divpoint = ip_find_hdr_v6(data_mp, ip6h, &ipp, NULL); 2464 if (ipp.ipp_dstopts != NULL && 2465 ipp.ipp_dstopts->ip6d_nxt != IPPROTO_ROUTING) { 2466 /* 2467 * Destination options are tricky. If we get in here, 2468 * then we have a terminal header following the 2469 * destination options. We need to adjust backwards 2470 * so we insert ESP BEFORE the destination options 2471 * bag. (So that the dstopts get encrypted!) 2472 * 2473 * Since this is for outbound packets only, we know 2474 * that non-terminal destination options only precede 2475 * routing headers. 2476 */ 2477 divpoint -= ipp.ipp_dstoptslen; 2478 } 2479 datalen = ntohs(ip6h->ip6_plen) + sizeof (ip6_t) - divpoint; 2480 2481 if (ipp.ipp_rthdr != NULL) { 2482 nhp = &ipp.ipp_rthdr->ip6r_nxt; 2483 } else if (ipp.ipp_hopopts != NULL) { 2484 nhp = &ipp.ipp_hopopts->ip6h_nxt; 2485 } else { 2486 ASSERT(divpoint == sizeof (ip6_t)); 2487 /* It's probably IP + ESP. */ 2488 nhp = &ip6h->ip6_nxt; 2489 } 2490 } 2491 assoc = io->ipsec_out_esp_sa; 2492 ASSERT(assoc != NULL); 2493 2494 if (assoc->ipsa_auth_alg != SADB_AALG_NONE) 2495 mac_len = assoc->ipsa_mac_len; 2496 2497 if (assoc->ipsa_flags & IPSA_F_NATT) { 2498 /* wedge in fake UDP */ 2499 is_natt = B_TRUE; 2500 esplen += UDPH_SIZE; 2501 } 2502 2503 /* 2504 * Set up ESP header and encryption padding for ENCR PI request. 2505 */ 2506 2507 /* Determine the padding length. Pad to 4-bytes for no-encryption. */ 2508 if (assoc->ipsa_encr_alg != SADB_EALG_NULL) { 2509 iv_len = assoc->ipsa_iv_len; 2510 2511 /* 2512 * Include the two additional bytes (hence the - 2) for the 2513 * padding length and the next header. Take this into account 2514 * when calculating the actual length of the padding. 2515 */ 2516 ASSERT(ISP2(iv_len)); 2517 padlen = ((unsigned)(iv_len - datalen - 2)) & (iv_len - 1); 2518 } else { 2519 iv_len = 0; 2520 padlen = ((unsigned)(sizeof (uint32_t) - datalen - 2)) & 2521 (sizeof (uint32_t) - 1); 2522 } 2523 2524 /* Allocate ESP header and IV. */ 2525 esplen += iv_len; 2526 2527 /* 2528 * Update association byte-count lifetimes. Don't forget to take 2529 * into account the padding length and next-header (hence the + 2). 2530 * 2531 * Use the amount of data fed into the "encryption algorithm". This 2532 * is the IV, the data length, the padding length, and the final two 2533 * bytes (padlen, and next-header). 2534 * 2535 */ 2536 2537 if (!esp_age_bytes(assoc, datalen + padlen + iv_len + 2, B_FALSE)) { 2538 /* 2539 * TODO: Find the outbound IRE for this packet and 2540 * pass it to ip_drop_packet(). 2541 */ 2542 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2543 DROPPER(ipss, ipds_esp_bytes_expire), 2544 &espstack->esp_dropper); 2545 return (IPSEC_STATUS_FAILED); 2546 } 2547 2548 espmp = allocb(esplen, BPRI_HI); 2549 if (espmp == NULL) { 2550 ESP_BUMP_STAT(espstack, out_discards); 2551 esp1dbg(espstack, ("esp_outbound: can't allocate espmp.\n")); 2552 /* 2553 * TODO: Find the outbound IRE for this packet and 2554 * pass it to ip_drop_packet(). 2555 */ 2556 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2557 DROPPER(ipss, ipds_esp_nomem), 2558 &espstack->esp_dropper); 2559 return (IPSEC_STATUS_FAILED); 2560 } 2561 espmp->b_wptr += esplen; 2562 esph = (esph_t *)espmp->b_rptr; 2563 2564 if (is_natt) { 2565 esp3dbg(espstack, ("esp_outbound: NATT")); 2566 2567 udpha = (udpha_t *)espmp->b_rptr; 2568 udpha->uha_src_port = (assoc->ipsa_local_nat_port != 0) ? 2569 assoc->ipsa_local_nat_port : htons(IPPORT_IKE_NATT); 2570 udpha->uha_dst_port = (assoc->ipsa_remote_nat_port != 0) ? 2571 assoc->ipsa_remote_nat_port : htons(IPPORT_IKE_NATT); 2572 /* 2573 * Set the checksum to 0, so that the esp_prepare_udp() call 2574 * can do the right thing. 2575 */ 2576 udpha->uha_checksum = 0; 2577 esph = (esph_t *)(udpha + 1); 2578 } 2579 2580 esph->esph_spi = assoc->ipsa_spi; 2581 2582 esph->esph_replay = htonl(atomic_add_32_nv(&assoc->ipsa_replay, 1)); 2583 if (esph->esph_replay == 0 && assoc->ipsa_replay_wsize != 0) { 2584 /* 2585 * XXX We have replay counter wrapping. 2586 * We probably want to nuke this SA (and its peer). 2587 */ 2588 ipsec_assocfailure(info.mi_idnum, 0, 0, 2589 SL_ERROR | SL_CONSOLE | SL_WARN, 2590 "Outbound ESP SA (0x%x, %s) has wrapped sequence.\n", 2591 esph->esph_spi, assoc->ipsa_dstaddr, af, 2592 espstack->ipsecesp_netstack); 2593 2594 ESP_BUMP_STAT(espstack, out_discards); 2595 sadb_replay_delete(assoc); 2596 /* 2597 * TODO: Find the outbound IRE for this packet and 2598 * pass it to ip_drop_packet(). 2599 */ 2600 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2601 DROPPER(ipss, ipds_esp_replay), 2602 &espstack->esp_dropper); 2603 return (IPSEC_STATUS_FAILED); 2604 } 2605 2606 /* 2607 * Set the IV to a random quantity. We do not require the 2608 * highest quality random bits, but for best security with CBC 2609 * mode ciphers, the value must be unlikely to repeat and also 2610 * must not be known in advance to an adversary capable of 2611 * influencing the plaintext. 2612 */ 2613 (void) random_get_pseudo_bytes((uint8_t *)(esph + 1), iv_len); 2614 2615 /* Fix the IP header. */ 2616 alloclen = padlen + 2 + mac_len; 2617 adj = alloclen + (espmp->b_wptr - espmp->b_rptr); 2618 2619 protocol = *nhp; 2620 2621 if (io->ipsec_out_v4) { 2622 ipha->ipha_length = htons(ntohs(ipha->ipha_length) + adj); 2623 if (is_natt) { 2624 *nhp = IPPROTO_UDP; 2625 udpha->uha_length = htons(ntohs(ipha->ipha_length) - 2626 IPH_HDR_LENGTH(ipha)); 2627 } else { 2628 *nhp = IPPROTO_ESP; 2629 } 2630 ipha->ipha_hdr_checksum = 0; 2631 ipha->ipha_hdr_checksum = (uint16_t)ip_csum_hdr(ipha); 2632 } else { 2633 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) + adj); 2634 *nhp = IPPROTO_ESP; 2635 } 2636 2637 /* I've got the two ESP mblks, now insert them. */ 2638 2639 esp2dbg(espstack, ("data_mp before outbound ESP adjustment:\n")); 2640 esp2dbg(espstack, (dump_msg(data_mp))); 2641 2642 if (!esp_insert_esp(data_mp, espmp, divpoint, espstack)) { 2643 ESP_BUMP_STAT(espstack, out_discards); 2644 /* NOTE: esp_insert_esp() only fails if there's no memory. */ 2645 /* 2646 * TODO: Find the outbound IRE for this packet and 2647 * pass it to ip_drop_packet(). 2648 */ 2649 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2650 DROPPER(ipss, ipds_esp_nomem), 2651 &espstack->esp_dropper); 2652 freeb(espmp); 2653 return (IPSEC_STATUS_FAILED); 2654 } 2655 2656 /* Append padding (and leave room for ICV). */ 2657 for (tailmp = data_mp; tailmp->b_cont != NULL; tailmp = tailmp->b_cont) 2658 ; 2659 if (tailmp->b_wptr + alloclen > tailmp->b_datap->db_lim) { 2660 tailmp->b_cont = allocb(alloclen, BPRI_HI); 2661 if (tailmp->b_cont == NULL) { 2662 ESP_BUMP_STAT(espstack, out_discards); 2663 esp0dbg(("esp_outbound: Can't allocate tailmp.\n")); 2664 /* 2665 * TODO: Find the outbound IRE for this packet and 2666 * pass it to ip_drop_packet(). 2667 */ 2668 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2669 DROPPER(ipss, ipds_esp_nomem), 2670 &espstack->esp_dropper); 2671 return (IPSEC_STATUS_FAILED); 2672 } 2673 tailmp = tailmp->b_cont; 2674 } 2675 2676 /* 2677 * If there's padding, N bytes of padding must be of the form 0x1, 2678 * 0x2, 0x3... 0xN. 2679 */ 2680 for (i = 0; i < padlen; ) { 2681 i++; 2682 *tailmp->b_wptr++ = i; 2683 } 2684 *tailmp->b_wptr++ = i; 2685 *tailmp->b_wptr++ = protocol; 2686 2687 esp2dbg(espstack, ("data_Mp before encryption:\n")); 2688 esp2dbg(espstack, (dump_msg(data_mp))); 2689 2690 /* 2691 * The packet is eligible for hardware acceleration if the 2692 * following conditions are satisfied: 2693 * 2694 * 1. the packet will not be fragmented 2695 * 2. the provider supports the algorithms specified by SA 2696 * 3. there is no pending control message being exchanged 2697 * 4. snoop is not attached 2698 * 5. the destination address is not a multicast address 2699 * 2700 * All five of these conditions are checked by IP prior to 2701 * sending the packet to ESP. 2702 * 2703 * But We, and We Alone, can, nay MUST check if the packet 2704 * is over NATT, and then disqualify it from hardware 2705 * acceleration. 2706 */ 2707 2708 if (io->ipsec_out_is_capab_ill && !(assoc->ipsa_flags & IPSA_F_NATT)) { 2709 return (esp_outbound_accelerated(ipsec_out_mp, mac_len)); 2710 } 2711 ESP_BUMP_STAT(espstack, noaccel); 2712 2713 /* 2714 * Okay. I've set up the pre-encryption ESP. Let's do it! 2715 */ 2716 2717 if (mac_len > 0) { 2718 ASSERT(tailmp->b_wptr + mac_len <= tailmp->b_datap->db_lim); 2719 icv_buf = tailmp->b_wptr; 2720 tailmp->b_wptr += mac_len; 2721 } else { 2722 icv_buf = NULL; 2723 } 2724 2725 return (esp_submit_req_outbound(ipsec_out_mp, assoc, icv_buf, 2726 datalen + padlen + 2)); 2727 } 2728 2729 /* 2730 * IP calls this to validate the ICMP errors that 2731 * we got from the network. 2732 */ 2733 ipsec_status_t 2734 ipsecesp_icmp_error(mblk_t *ipsec_mp) 2735 { 2736 ipsec_in_t *ii = (ipsec_in_t *)ipsec_mp->b_rptr; 2737 boolean_t is_inbound = (ii->ipsec_in_type == IPSEC_IN); 2738 netstack_t *ns; 2739 ipsecesp_stack_t *espstack; 2740 ipsec_stack_t *ipss; 2741 2742 if (is_inbound) { 2743 ns = ii->ipsec_in_ns; 2744 } else { 2745 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 2746 2747 ns = io->ipsec_out_ns; 2748 } 2749 espstack = ns->netstack_ipsecesp; 2750 ipss = ns->netstack_ipsec; 2751 2752 /* 2753 * Unless we get an entire packet back, this function is useless. 2754 * Why? 2755 * 2756 * 1.) Partial packets are useless, because the "next header" 2757 * is at the end of the decrypted ESP packet. Without the 2758 * whole packet, this is useless. 2759 * 2760 * 2.) If we every use a stateful cipher, such as a stream or a 2761 * one-time pad, we can't do anything. 2762 * 2763 * Since the chances of us getting an entire packet back are very 2764 * very small, we discard here. 2765 */ 2766 IP_ESP_BUMP_STAT(ipss, in_discards); 2767 ip_drop_packet(ipsec_mp, B_TRUE, NULL, NULL, 2768 DROPPER(ipss, ipds_esp_icmp), 2769 &espstack->esp_dropper); 2770 return (IPSEC_STATUS_FAILED); 2771 } 2772 2773 /* 2774 * ESP module read put routine. 2775 */ 2776 /* ARGSUSED */ 2777 static void 2778 ipsecesp_rput(queue_t *q, mblk_t *mp) 2779 { 2780 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 2781 2782 ASSERT(mp->b_datap->db_type != M_CTL); /* No more IRE_DB_REQ. */ 2783 2784 switch (mp->b_datap->db_type) { 2785 case M_PROTO: 2786 case M_PCPROTO: 2787 /* TPI message of some sort. */ 2788 switch (*((t_scalar_t *)mp->b_rptr)) { 2789 case T_BIND_ACK: 2790 esp3dbg(espstack, 2791 ("Thank you IP from ESP for T_BIND_ACK\n")); 2792 break; 2793 case T_ERROR_ACK: 2794 cmn_err(CE_WARN, 2795 "ipsecesp: ESP received T_ERROR_ACK from IP."); 2796 /* 2797 * Make esp_sadb.s_ip_q NULL, and in the 2798 * future, perhaps try again. 2799 */ 2800 espstack->esp_sadb.s_ip_q = NULL; 2801 break; 2802 case T_OK_ACK: 2803 /* Probably from a (rarely sent) T_UNBIND_REQ. */ 2804 break; 2805 default: 2806 esp0dbg(("Unknown M_{,PC}PROTO message.\n")); 2807 } 2808 freemsg(mp); 2809 break; 2810 default: 2811 /* For now, passthru message. */ 2812 esp2dbg(espstack, ("ESP got unknown mblk type %d.\n", 2813 mp->b_datap->db_type)); 2814 putnext(q, mp); 2815 } 2816 } 2817 2818 /* 2819 * Construct an SADB_REGISTER message with the current algorithms. 2820 */ 2821 static boolean_t 2822 esp_register_out(uint32_t sequence, uint32_t pid, uint_t serial, 2823 ipsecesp_stack_t *espstack) 2824 { 2825 mblk_t *pfkey_msg_mp, *keysock_out_mp; 2826 sadb_msg_t *samsg; 2827 sadb_supported_t *sasupp_auth = NULL; 2828 sadb_supported_t *sasupp_encr = NULL; 2829 sadb_alg_t *saalg; 2830 uint_t allocsize = sizeof (*samsg); 2831 uint_t i, numalgs_snap; 2832 int current_aalgs; 2833 ipsec_alginfo_t **authalgs; 2834 uint_t num_aalgs; 2835 int current_ealgs; 2836 ipsec_alginfo_t **encralgs; 2837 uint_t num_ealgs; 2838 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 2839 2840 /* Allocate the KEYSOCK_OUT. */ 2841 keysock_out_mp = sadb_keysock_out(serial); 2842 if (keysock_out_mp == NULL) { 2843 esp0dbg(("esp_register_out: couldn't allocate mblk.\n")); 2844 return (B_FALSE); 2845 } 2846 2847 /* 2848 * Allocate the PF_KEY message that follows KEYSOCK_OUT. 2849 */ 2850 2851 mutex_enter(&ipss->ipsec_alg_lock); 2852 2853 /* 2854 * Fill SADB_REGISTER message's algorithm descriptors. Hold 2855 * down the lock while filling it. 2856 * 2857 * Return only valid algorithms, so the number of algorithms 2858 * to send up may be less than the number of algorithm entries 2859 * in the table. 2860 */ 2861 authalgs = ipss->ipsec_alglists[IPSEC_ALG_AUTH]; 2862 for (num_aalgs = 0, i = 0; i < IPSEC_MAX_ALGS; i++) 2863 if (authalgs[i] != NULL && ALG_VALID(authalgs[i])) 2864 num_aalgs++; 2865 2866 if (num_aalgs != 0) { 2867 allocsize += (num_aalgs * sizeof (*saalg)); 2868 allocsize += sizeof (*sasupp_auth); 2869 } 2870 encralgs = ipss->ipsec_alglists[IPSEC_ALG_ENCR]; 2871 for (num_ealgs = 0, i = 0; i < IPSEC_MAX_ALGS; i++) 2872 if (encralgs[i] != NULL && ALG_VALID(encralgs[i])) 2873 num_ealgs++; 2874 2875 if (num_ealgs != 0) { 2876 allocsize += (num_ealgs * sizeof (*saalg)); 2877 allocsize += sizeof (*sasupp_encr); 2878 } 2879 keysock_out_mp->b_cont = allocb(allocsize, BPRI_HI); 2880 if (keysock_out_mp->b_cont == NULL) { 2881 mutex_exit(&ipss->ipsec_alg_lock); 2882 freemsg(keysock_out_mp); 2883 return (B_FALSE); 2884 } 2885 2886 pfkey_msg_mp = keysock_out_mp->b_cont; 2887 pfkey_msg_mp->b_wptr += allocsize; 2888 if (num_aalgs != 0) { 2889 sasupp_auth = (sadb_supported_t *) 2890 (pfkey_msg_mp->b_rptr + sizeof (*samsg)); 2891 saalg = (sadb_alg_t *)(sasupp_auth + 1); 2892 2893 ASSERT(((ulong_t)saalg & 0x7) == 0); 2894 2895 numalgs_snap = 0; 2896 for (i = 0; 2897 ((i < IPSEC_MAX_ALGS) && (numalgs_snap < num_aalgs)); 2898 i++) { 2899 if (authalgs[i] == NULL || !ALG_VALID(authalgs[i])) 2900 continue; 2901 2902 saalg->sadb_alg_id = authalgs[i]->alg_id; 2903 saalg->sadb_alg_ivlen = 0; 2904 saalg->sadb_alg_minbits = authalgs[i]->alg_ef_minbits; 2905 saalg->sadb_alg_maxbits = authalgs[i]->alg_ef_maxbits; 2906 saalg->sadb_x_alg_defincr = authalgs[i]->alg_ef_default; 2907 saalg->sadb_x_alg_increment = 2908 authalgs[i]->alg_increment; 2909 numalgs_snap++; 2910 saalg++; 2911 } 2912 ASSERT(numalgs_snap == num_aalgs); 2913 #ifdef DEBUG 2914 /* 2915 * Reality check to make sure I snagged all of the 2916 * algorithms. 2917 */ 2918 for (; i < IPSEC_MAX_ALGS; i++) { 2919 if (authalgs[i] != NULL && ALG_VALID(authalgs[i])) { 2920 cmn_err(CE_PANIC, "esp_register_out()! " 2921 "Missed aalg #%d.\n", i); 2922 } 2923 } 2924 #endif /* DEBUG */ 2925 } else { 2926 saalg = (sadb_alg_t *)(pfkey_msg_mp->b_rptr + sizeof (*samsg)); 2927 } 2928 2929 if (num_ealgs != 0) { 2930 sasupp_encr = (sadb_supported_t *)saalg; 2931 saalg = (sadb_alg_t *)(sasupp_encr + 1); 2932 2933 numalgs_snap = 0; 2934 for (i = 0; 2935 ((i < IPSEC_MAX_ALGS) && (numalgs_snap < num_ealgs)); i++) { 2936 if (encralgs[i] == NULL || !ALG_VALID(encralgs[i])) 2937 continue; 2938 saalg->sadb_alg_id = encralgs[i]->alg_id; 2939 saalg->sadb_alg_ivlen = encralgs[i]->alg_datalen; 2940 saalg->sadb_alg_minbits = encralgs[i]->alg_ef_minbits; 2941 saalg->sadb_alg_maxbits = encralgs[i]->alg_ef_maxbits; 2942 saalg->sadb_x_alg_defincr = encralgs[i]->alg_ef_default; 2943 saalg->sadb_x_alg_increment = 2944 encralgs[i]->alg_increment; 2945 numalgs_snap++; 2946 saalg++; 2947 } 2948 ASSERT(numalgs_snap == num_ealgs); 2949 #ifdef DEBUG 2950 /* 2951 * Reality check to make sure I snagged all of the 2952 * algorithms. 2953 */ 2954 for (; i < IPSEC_MAX_ALGS; i++) { 2955 if (encralgs[i] != NULL && ALG_VALID(encralgs[i])) { 2956 cmn_err(CE_PANIC, "esp_register_out()! " 2957 "Missed ealg #%d.\n", i); 2958 } 2959 } 2960 #endif /* DEBUG */ 2961 } 2962 2963 current_aalgs = num_aalgs; 2964 current_ealgs = num_ealgs; 2965 2966 mutex_exit(&ipss->ipsec_alg_lock); 2967 2968 /* Now fill the rest of the SADB_REGISTER message. */ 2969 2970 samsg = (sadb_msg_t *)pfkey_msg_mp->b_rptr; 2971 samsg->sadb_msg_version = PF_KEY_V2; 2972 samsg->sadb_msg_type = SADB_REGISTER; 2973 samsg->sadb_msg_errno = 0; 2974 samsg->sadb_msg_satype = SADB_SATYPE_ESP; 2975 samsg->sadb_msg_len = SADB_8TO64(allocsize); 2976 samsg->sadb_msg_reserved = 0; 2977 /* 2978 * Assume caller has sufficient sequence/pid number info. If it's one 2979 * from me over a new alg., I could give two hoots about sequence. 2980 */ 2981 samsg->sadb_msg_seq = sequence; 2982 samsg->sadb_msg_pid = pid; 2983 2984 if (sasupp_auth != NULL) { 2985 sasupp_auth->sadb_supported_len = SADB_8TO64( 2986 sizeof (*sasupp_auth) + sizeof (*saalg) * current_aalgs); 2987 sasupp_auth->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 2988 sasupp_auth->sadb_supported_reserved = 0; 2989 } 2990 2991 if (sasupp_encr != NULL) { 2992 sasupp_encr->sadb_supported_len = SADB_8TO64( 2993 sizeof (*sasupp_encr) + sizeof (*saalg) * current_ealgs); 2994 sasupp_encr->sadb_supported_exttype = 2995 SADB_EXT_SUPPORTED_ENCRYPT; 2996 sasupp_encr->sadb_supported_reserved = 0; 2997 } 2998 2999 if (espstack->esp_pfkey_q != NULL) 3000 putnext(espstack->esp_pfkey_q, keysock_out_mp); 3001 else { 3002 freemsg(keysock_out_mp); 3003 return (B_FALSE); 3004 } 3005 3006 return (B_TRUE); 3007 } 3008 3009 /* 3010 * Invoked when the algorithm table changes. Causes SADB_REGISTER 3011 * messages continaining the current list of algorithms to be 3012 * sent up to the ESP listeners. 3013 */ 3014 void 3015 ipsecesp_algs_changed(netstack_t *ns) 3016 { 3017 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3018 3019 /* 3020 * Time to send a PF_KEY SADB_REGISTER message to ESP listeners 3021 * everywhere. (The function itself checks for NULL esp_pfkey_q.) 3022 */ 3023 (void) esp_register_out(0, 0, 0, espstack); 3024 } 3025 3026 /* 3027 * taskq_dispatch handler. 3028 */ 3029 static void 3030 inbound_task(void *arg) 3031 { 3032 esph_t *esph; 3033 mblk_t *mp = (mblk_t *)arg; 3034 ipsec_in_t *ii = (ipsec_in_t *)mp->b_rptr; 3035 netstack_t *ns = ii->ipsec_in_ns; 3036 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3037 int ipsec_rc; 3038 3039 esp2dbg(espstack, ("in ESP inbound_task")); 3040 ASSERT(espstack != NULL); 3041 3042 esph = ipsec_inbound_esp_sa(mp, ns); 3043 if (esph == NULL) 3044 return; 3045 ASSERT(ii->ipsec_in_esp_sa != NULL); 3046 ipsec_rc = ii->ipsec_in_esp_sa->ipsa_input_func(mp, esph); 3047 if (ipsec_rc != IPSEC_STATUS_SUCCESS) 3048 return; 3049 ip_fanout_proto_again(mp, NULL, NULL, NULL); 3050 } 3051 3052 /* 3053 * Now that weak-key passed, actually ADD the security association, and 3054 * send back a reply ADD message. 3055 */ 3056 static int 3057 esp_add_sa_finish(mblk_t *mp, sadb_msg_t *samsg, keysock_in_t *ksi, 3058 int *diagnostic, ipsecesp_stack_t *espstack) 3059 { 3060 isaf_t *primary, *secondary, *inbound, *outbound; 3061 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3062 sadb_address_t *dstext = 3063 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3064 struct sockaddr_in *dst; 3065 struct sockaddr_in6 *dst6; 3066 boolean_t is_ipv4, clone = B_FALSE, is_inbound = B_FALSE; 3067 uint32_t *dstaddr; 3068 ipsa_t *larval = NULL; 3069 ipsacq_t *acqrec; 3070 iacqf_t *acq_bucket; 3071 mblk_t *acq_msgs = NULL; 3072 int rc; 3073 sadb_t *sp; 3074 int outhash; 3075 mblk_t *lpkt; 3076 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 3077 3078 /* 3079 * Locate the appropriate table(s). 3080 */ 3081 3082 dst = (struct sockaddr_in *)(dstext + 1); 3083 dst6 = (struct sockaddr_in6 *)dst; 3084 is_ipv4 = (dst->sin_family == AF_INET); 3085 if (is_ipv4) { 3086 sp = &espstack->esp_sadb.s_v4; 3087 dstaddr = (uint32_t *)(&dst->sin_addr); 3088 outhash = OUTBOUND_HASH_V4(sp, *(ipaddr_t *)dstaddr); 3089 } else { 3090 sp = &espstack->esp_sadb.s_v6; 3091 dstaddr = (uint32_t *)(&dst6->sin6_addr); 3092 outhash = OUTBOUND_HASH_V6(sp, *(in6_addr_t *)dstaddr); 3093 } 3094 3095 inbound = INBOUND_BUCKET(sp, assoc->sadb_sa_spi); 3096 outbound = &sp->sdb_of[outhash]; 3097 3098 switch (ksi->ks_in_dsttype) { 3099 case KS_IN_ADDR_MBCAST: 3100 clone = B_TRUE; /* All mcast SAs can be bidirectional */ 3101 /* FALLTHRU */ 3102 case KS_IN_ADDR_ME: 3103 primary = inbound; 3104 secondary = outbound; 3105 /* 3106 * If the source address is either one of mine, or unspecified 3107 * (which is best summed up by saying "not 'not mine'"), 3108 * then the association is potentially bi-directional, 3109 * in that it can be used for inbound traffic and outbound 3110 * traffic. The best example of such an SA is a multicast 3111 * SA (which allows me to receive the outbound traffic). 3112 */ 3113 if (ksi->ks_in_srctype != KS_IN_ADDR_NOTME) 3114 clone = B_TRUE; 3115 is_inbound = B_TRUE; 3116 break; 3117 case KS_IN_ADDR_NOTME: 3118 primary = outbound; 3119 secondary = inbound; 3120 /* 3121 * If the source address literally not mine (either 3122 * unspecified or not mine), then this SA may have an 3123 * address that WILL be mine after some configuration. 3124 * We pay the price for this by making it a bi-directional 3125 * SA. 3126 */ 3127 if (ksi->ks_in_srctype != KS_IN_ADDR_ME) 3128 clone = B_TRUE; 3129 break; 3130 default: 3131 *diagnostic = SADB_X_DIAGNOSTIC_BAD_DST; 3132 return (EINVAL); 3133 } 3134 3135 /* 3136 * Find a ACQUIRE list entry if possible. If we've added an SA that 3137 * suits the needs of an ACQUIRE list entry, we can eliminate the 3138 * ACQUIRE list entry and transmit the enqueued packets. Use the 3139 * high-bit of the sequence number to queue it. Key off destination 3140 * addr, and change acqrec's state. 3141 */ 3142 3143 if (samsg->sadb_msg_seq & IACQF_LOWEST_SEQ) { 3144 acq_bucket = &sp->sdb_acq[outhash]; 3145 mutex_enter(&acq_bucket->iacqf_lock); 3146 for (acqrec = acq_bucket->iacqf_ipsacq; acqrec != NULL; 3147 acqrec = acqrec->ipsacq_next) { 3148 mutex_enter(&acqrec->ipsacq_lock); 3149 /* 3150 * Q: I only check sequence. Should I check dst? 3151 * A: Yes, check dest because those are the packets 3152 * that are queued up. 3153 */ 3154 if (acqrec->ipsacq_seq == samsg->sadb_msg_seq && 3155 IPSA_ARE_ADDR_EQUAL(dstaddr, 3156 acqrec->ipsacq_dstaddr, acqrec->ipsacq_addrfam)) 3157 break; 3158 mutex_exit(&acqrec->ipsacq_lock); 3159 } 3160 if (acqrec != NULL) { 3161 /* 3162 * AHA! I found an ACQUIRE record for this SA. 3163 * Grab the msg list, and free the acquire record. 3164 * I already am holding the lock for this record, 3165 * so all I have to do is free it. 3166 */ 3167 acq_msgs = acqrec->ipsacq_mp; 3168 acqrec->ipsacq_mp = NULL; 3169 mutex_exit(&acqrec->ipsacq_lock); 3170 sadb_destroy_acquire(acqrec, 3171 espstack->ipsecesp_netstack); 3172 } 3173 mutex_exit(&acq_bucket->iacqf_lock); 3174 } 3175 3176 /* 3177 * Find PF_KEY message, and see if I'm an update. If so, find entry 3178 * in larval list (if there). 3179 */ 3180 3181 if (samsg->sadb_msg_type == SADB_UPDATE) { 3182 mutex_enter(&inbound->isaf_lock); 3183 larval = ipsec_getassocbyspi(inbound, assoc->sadb_sa_spi, 3184 ALL_ZEROES_PTR, dstaddr, dst->sin_family); 3185 mutex_exit(&inbound->isaf_lock); 3186 3187 if (larval == NULL) { 3188 esp0dbg(("Larval update, but larval disappeared.\n")); 3189 return (ESRCH); 3190 } /* Else sadb_common_add unlinks it for me! */ 3191 } 3192 3193 lpkt = NULL; 3194 if (larval != NULL) 3195 lpkt = sadb_clear_lpkt(larval); 3196 3197 rc = sadb_common_add(espstack->esp_sadb.s_ip_q, espstack->esp_pfkey_q, 3198 mp, samsg, ksi, primary, secondary, larval, clone, is_inbound, 3199 diagnostic, espstack->ipsecesp_netstack); 3200 3201 if (rc == 0 && lpkt != NULL) { 3202 rc = !taskq_dispatch(esp_taskq, inbound_task, 3203 (void *) lpkt, TQ_NOSLEEP); 3204 } 3205 3206 if (rc != 0) { 3207 ip_drop_packet(lpkt, B_TRUE, NULL, NULL, 3208 DROPPER(ipss, ipds_sadb_inlarval_timeout), 3209 &espstack->esp_dropper); 3210 } 3211 3212 /* 3213 * How much more stack will I create with all of these 3214 * esp_outbound() calls? 3215 */ 3216 3217 while (acq_msgs != NULL) { 3218 mblk_t *mp = acq_msgs; 3219 3220 acq_msgs = acq_msgs->b_next; 3221 mp->b_next = NULL; 3222 if (rc == 0) { 3223 if (ipsec_outbound_sa(mp, IPPROTO_ESP)) { 3224 ((ipsec_out_t *)(mp->b_rptr))-> 3225 ipsec_out_esp_done = B_TRUE; 3226 if (esp_outbound(mp) == IPSEC_STATUS_SUCCESS) { 3227 ipha_t *ipha; 3228 3229 /* do AH processing if needed */ 3230 if (!esp_do_outbound_ah(mp)) 3231 continue; 3232 3233 ipha = (ipha_t *)mp->b_cont->b_rptr; 3234 3235 /* finish IPsec processing */ 3236 if (is_ipv4) { 3237 ip_wput_ipsec_out(NULL, mp, 3238 ipha, NULL, NULL); 3239 } else { 3240 ip6_t *ip6h = (ip6_t *)ipha; 3241 ip_wput_ipsec_out_v6(NULL, 3242 mp, ip6h, NULL, NULL); 3243 } 3244 } 3245 continue; 3246 } 3247 } 3248 ESP_BUMP_STAT(espstack, out_discards); 3249 ip_drop_packet(mp, B_FALSE, NULL, NULL, 3250 DROPPER(ipss, ipds_sadb_acquire_timeout), 3251 &espstack->esp_dropper); 3252 } 3253 3254 return (rc); 3255 } 3256 3257 /* 3258 * Add new ESP security association. This may become a generic AH/ESP 3259 * routine eventually. 3260 */ 3261 static int 3262 esp_add_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, netstack_t *ns) 3263 { 3264 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3265 sadb_address_t *srcext = 3266 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_SRC]; 3267 sadb_address_t *dstext = 3268 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3269 sadb_address_t *isrcext = 3270 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_INNER_SRC]; 3271 sadb_address_t *idstext = 3272 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_INNER_DST]; 3273 sadb_address_t *nttext_loc = 3274 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_NATT_LOC]; 3275 sadb_address_t *nttext_rem = 3276 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_NATT_REM]; 3277 sadb_key_t *akey = (sadb_key_t *)ksi->ks_in_extv[SADB_EXT_KEY_AUTH]; 3278 sadb_key_t *ekey = (sadb_key_t *)ksi->ks_in_extv[SADB_EXT_KEY_ENCRYPT]; 3279 struct sockaddr_in *src, *dst; 3280 struct sockaddr_in *natt_loc, *natt_rem; 3281 struct sockaddr_in6 *natt_loc6, *natt_rem6; 3282 sadb_lifetime_t *soft = 3283 (sadb_lifetime_t *)ksi->ks_in_extv[SADB_EXT_LIFETIME_SOFT]; 3284 sadb_lifetime_t *hard = 3285 (sadb_lifetime_t *)ksi->ks_in_extv[SADB_EXT_LIFETIME_HARD]; 3286 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3287 ipsec_stack_t *ipss = ns->netstack_ipsec; 3288 3289 /* I need certain extensions present for an ADD message. */ 3290 if (srcext == NULL) { 3291 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SRC; 3292 return (EINVAL); 3293 } 3294 if (dstext == NULL) { 3295 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_DST; 3296 return (EINVAL); 3297 } 3298 if (isrcext == NULL && idstext != NULL) { 3299 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_INNER_SRC; 3300 return (EINVAL); 3301 } 3302 if (isrcext != NULL && idstext == NULL) { 3303 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_INNER_DST; 3304 return (EINVAL); 3305 } 3306 if (assoc == NULL) { 3307 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SA; 3308 return (EINVAL); 3309 } 3310 if (ekey == NULL && assoc->sadb_sa_encrypt != SADB_EALG_NULL) { 3311 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_EKEY; 3312 return (EINVAL); 3313 } 3314 3315 src = (struct sockaddr_in *)(srcext + 1); 3316 dst = (struct sockaddr_in *)(dstext + 1); 3317 natt_loc = (struct sockaddr_in *)(nttext_loc + 1); 3318 natt_loc6 = (struct sockaddr_in6 *)(nttext_loc + 1); 3319 natt_rem = (struct sockaddr_in *)(nttext_rem + 1); 3320 natt_rem6 = (struct sockaddr_in6 *)(nttext_rem + 1); 3321 3322 /* Sundry ADD-specific reality checks. */ 3323 /* XXX STATS : Logging/stats here? */ 3324 if (assoc->sadb_sa_state != SADB_SASTATE_MATURE) { 3325 *diagnostic = SADB_X_DIAGNOSTIC_BAD_SASTATE; 3326 return (EINVAL); 3327 } 3328 if (assoc->sadb_sa_encrypt == SADB_EALG_NONE) { 3329 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EALG; 3330 return (EINVAL); 3331 } 3332 3333 if (assoc->sadb_sa_encrypt == SADB_EALG_NULL && 3334 assoc->sadb_sa_auth == SADB_AALG_NONE) { 3335 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AALG; 3336 return (EINVAL); 3337 } 3338 3339 if (assoc->sadb_sa_flags & ~(SADB_SAFLAGS_NOREPLAY | 3340 SADB_X_SAFLAGS_NATT_LOC | SADB_X_SAFLAGS_NATT_REM | 3341 SADB_X_SAFLAGS_TUNNEL)) { 3342 *diagnostic = SADB_X_DIAGNOSTIC_BAD_SAFLAGS; 3343 return (EINVAL); 3344 } 3345 3346 if ((*diagnostic = sadb_hardsoftchk(hard, soft)) != 0) { 3347 return (EINVAL); 3348 } 3349 ASSERT(src->sin_family == dst->sin_family); 3350 3351 if (assoc->sadb_sa_flags & SADB_X_SAFLAGS_NATT_LOC) { 3352 if (nttext_loc == NULL) { 3353 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_NATT_LOC; 3354 return (EINVAL); 3355 } 3356 3357 if (natt_loc->sin_family == AF_INET6 && 3358 !IN6_IS_ADDR_V4MAPPED(&natt_loc6->sin6_addr)) { 3359 *diagnostic = SADB_X_DIAGNOSTIC_MALFORMED_NATT_LOC; 3360 return (EINVAL); 3361 } 3362 } 3363 3364 if (assoc->sadb_sa_flags & SADB_X_SAFLAGS_NATT_REM) { 3365 if (nttext_rem == NULL) { 3366 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_NATT_REM; 3367 return (EINVAL); 3368 } 3369 if (natt_rem->sin_family == AF_INET6 && 3370 !IN6_IS_ADDR_V4MAPPED(&natt_rem6->sin6_addr)) { 3371 *diagnostic = SADB_X_DIAGNOSTIC_MALFORMED_NATT_REM; 3372 return (EINVAL); 3373 } 3374 } 3375 3376 3377 /* Stuff I don't support, for now. XXX Diagnostic? */ 3378 if (ksi->ks_in_extv[SADB_EXT_LIFETIME_CURRENT] != NULL || 3379 ksi->ks_in_extv[SADB_EXT_SENSITIVITY] != NULL) 3380 return (EOPNOTSUPP); 3381 3382 /* 3383 * XXX Policy : I'm not checking identities or sensitivity 3384 * labels at this time, but if I did, I'd do them here, before I sent 3385 * the weak key check up to the algorithm. 3386 */ 3387 3388 mutex_enter(&ipss->ipsec_alg_lock); 3389 3390 /* 3391 * First locate the authentication algorithm. 3392 */ 3393 if (akey != NULL) { 3394 ipsec_alginfo_t *aalg; 3395 3396 aalg = ipss->ipsec_alglists[IPSEC_ALG_AUTH] 3397 [assoc->sadb_sa_auth]; 3398 if (aalg == NULL || !ALG_VALID(aalg)) { 3399 mutex_exit(&ipss->ipsec_alg_lock); 3400 esp1dbg(espstack, ("Couldn't find auth alg #%d.\n", 3401 assoc->sadb_sa_auth)); 3402 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AALG; 3403 return (EINVAL); 3404 } 3405 3406 /* 3407 * Sanity check key sizes. 3408 * Note: It's not possible to use SADB_AALG_NONE because 3409 * this auth_alg is not defined with ALG_FLAG_VALID. If this 3410 * ever changes, the same check for SADB_AALG_NONE and 3411 * a auth_key != NULL should be made here ( see below). 3412 */ 3413 if (!ipsec_valid_key_size(akey->sadb_key_bits, aalg)) { 3414 mutex_exit(&ipss->ipsec_alg_lock); 3415 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AKEYBITS; 3416 return (EINVAL); 3417 } 3418 ASSERT(aalg->alg_mech_type != CRYPTO_MECHANISM_INVALID); 3419 3420 /* check key and fix parity if needed */ 3421 if (ipsec_check_key(aalg->alg_mech_type, akey, B_TRUE, 3422 diagnostic) != 0) { 3423 mutex_exit(&ipss->ipsec_alg_lock); 3424 return (EINVAL); 3425 } 3426 } 3427 3428 /* 3429 * Then locate the encryption algorithm. 3430 */ 3431 if (ekey != NULL) { 3432 ipsec_alginfo_t *ealg; 3433 3434 ealg = ipss->ipsec_alglists[IPSEC_ALG_ENCR] 3435 [assoc->sadb_sa_encrypt]; 3436 if (ealg == NULL || !ALG_VALID(ealg)) { 3437 mutex_exit(&ipss->ipsec_alg_lock); 3438 esp1dbg(espstack, ("Couldn't find encr alg #%d.\n", 3439 assoc->sadb_sa_encrypt)); 3440 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EALG; 3441 return (EINVAL); 3442 } 3443 3444 /* 3445 * Sanity check key sizes. If the encryption algorithm is 3446 * SADB_EALG_NULL but the encryption key is NOT 3447 * NULL then complain. 3448 */ 3449 if ((assoc->sadb_sa_encrypt == SADB_EALG_NULL) || 3450 (!ipsec_valid_key_size(ekey->sadb_key_bits, ealg))) { 3451 mutex_exit(&ipss->ipsec_alg_lock); 3452 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EKEYBITS; 3453 return (EINVAL); 3454 } 3455 ASSERT(ealg->alg_mech_type != CRYPTO_MECHANISM_INVALID); 3456 3457 /* check key */ 3458 if (ipsec_check_key(ealg->alg_mech_type, ekey, B_FALSE, 3459 diagnostic) != 0) { 3460 mutex_exit(&ipss->ipsec_alg_lock); 3461 return (EINVAL); 3462 } 3463 } 3464 mutex_exit(&ipss->ipsec_alg_lock); 3465 3466 return (esp_add_sa_finish(mp, (sadb_msg_t *)mp->b_cont->b_rptr, ksi, 3467 diagnostic, espstack)); 3468 } 3469 3470 /* 3471 * Update a security association. Updates come in two varieties. The first 3472 * is an update of lifetimes on a non-larval SA. The second is an update of 3473 * a larval SA, which ends up looking a lot more like an add. 3474 */ 3475 static int 3476 esp_update_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, 3477 ipsecesp_stack_t *espstack) 3478 { 3479 sadb_address_t *dstext = 3480 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3481 struct sockaddr_in *sin; 3482 3483 if (dstext == NULL) { 3484 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_DST; 3485 return (EINVAL); 3486 } 3487 3488 sin = (struct sockaddr_in *)(dstext + 1); 3489 return (sadb_update_sa(mp, ksi, 3490 (sin->sin_family == AF_INET6) ? &espstack->esp_sadb.s_v6 : 3491 &espstack->esp_sadb.s_v4, diagnostic, espstack->esp_pfkey_q, 3492 esp_add_sa, espstack->ipsecesp_netstack)); 3493 } 3494 3495 /* 3496 * Delete a security association. This is REALLY likely to be code common to 3497 * both AH and ESP. Find the association, then unlink it. 3498 */ 3499 static int 3500 esp_del_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, 3501 ipsecesp_stack_t *espstack) 3502 { 3503 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3504 sadb_address_t *dstext = 3505 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3506 sadb_address_t *srcext = 3507 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_SRC]; 3508 struct sockaddr_in *sin; 3509 3510 if (assoc == NULL) { 3511 if (dstext != NULL) { 3512 sin = (struct sockaddr_in *)(dstext + 1); 3513 } else if (srcext != NULL) { 3514 sin = (struct sockaddr_in *)(srcext + 1); 3515 } else { 3516 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SA; 3517 return (EINVAL); 3518 } 3519 return (sadb_purge_sa(mp, ksi, 3520 (sin->sin_family == AF_INET6) ? &espstack->esp_sadb.s_v6 : 3521 &espstack->esp_sadb.s_v4, espstack->esp_pfkey_q, 3522 espstack->esp_sadb.s_ip_q)); 3523 } 3524 3525 return (sadb_del_sa(mp, ksi, &espstack->esp_sadb, diagnostic, 3526 espstack->esp_pfkey_q)); 3527 } 3528 3529 /* 3530 * Convert the entire contents of all of ESP's SA tables into PF_KEY SADB_DUMP 3531 * messages. 3532 */ 3533 static void 3534 esp_dump(mblk_t *mp, keysock_in_t *ksi, ipsecesp_stack_t *espstack) 3535 { 3536 int error; 3537 sadb_msg_t *samsg; 3538 3539 /* 3540 * Dump each fanout, bailing if error is non-zero. 3541 */ 3542 3543 error = sadb_dump(espstack->esp_pfkey_q, mp, ksi->ks_in_serial, 3544 &espstack->esp_sadb.s_v4); 3545 if (error != 0) 3546 goto bail; 3547 3548 error = sadb_dump(espstack->esp_pfkey_q, mp, ksi->ks_in_serial, 3549 &espstack->esp_sadb.s_v6); 3550 bail: 3551 ASSERT(mp->b_cont != NULL); 3552 samsg = (sadb_msg_t *)mp->b_cont->b_rptr; 3553 samsg->sadb_msg_errno = (uint8_t)error; 3554 sadb_pfkey_echo(espstack->esp_pfkey_q, mp, 3555 (sadb_msg_t *)mp->b_cont->b_rptr, ksi, NULL); 3556 } 3557 3558 /* 3559 * First-cut reality check for an inbound PF_KEY message. 3560 */ 3561 static boolean_t 3562 esp_pfkey_reality_failures(mblk_t *mp, keysock_in_t *ksi, 3563 ipsecesp_stack_t *espstack) 3564 { 3565 int diagnostic; 3566 3567 if (ksi->ks_in_extv[SADB_EXT_PROPOSAL] != NULL) { 3568 diagnostic = SADB_X_DIAGNOSTIC_PROP_PRESENT; 3569 goto badmsg; 3570 } 3571 if (ksi->ks_in_extv[SADB_EXT_SUPPORTED_AUTH] != NULL || 3572 ksi->ks_in_extv[SADB_EXT_SUPPORTED_ENCRYPT] != NULL) { 3573 diagnostic = SADB_X_DIAGNOSTIC_SUPP_PRESENT; 3574 goto badmsg; 3575 } 3576 return (B_FALSE); /* False ==> no failures */ 3577 3578 badmsg: 3579 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EINVAL, diagnostic, 3580 ksi->ks_in_serial); 3581 return (B_TRUE); /* True ==> failures */ 3582 } 3583 3584 /* 3585 * ESP parsing of PF_KEY messages. Keysock did most of the really silly 3586 * error cases. What I receive is a fully-formed, syntactically legal 3587 * PF_KEY message. I then need to check semantics... 3588 * 3589 * This code may become common to AH and ESP. Stay tuned. 3590 * 3591 * I also make the assumption that db_ref's are cool. If this assumption 3592 * is wrong, this means that someone other than keysock or me has been 3593 * mucking with PF_KEY messages. 3594 */ 3595 static void 3596 esp_parse_pfkey(mblk_t *mp, ipsecesp_stack_t *espstack) 3597 { 3598 mblk_t *msg = mp->b_cont; 3599 sadb_msg_t *samsg; 3600 keysock_in_t *ksi; 3601 int error; 3602 int diagnostic = SADB_X_DIAGNOSTIC_NONE; 3603 3604 ASSERT(msg != NULL); 3605 3606 samsg = (sadb_msg_t *)msg->b_rptr; 3607 ksi = (keysock_in_t *)mp->b_rptr; 3608 3609 /* 3610 * If applicable, convert unspecified AF_INET6 to unspecified 3611 * AF_INET. And do other address reality checks. 3612 */ 3613 if (!sadb_addrfix(ksi, espstack->esp_pfkey_q, mp, 3614 espstack->ipsecesp_netstack) || 3615 esp_pfkey_reality_failures(mp, ksi, espstack)) { 3616 return; 3617 } 3618 3619 switch (samsg->sadb_msg_type) { 3620 case SADB_ADD: 3621 error = esp_add_sa(mp, ksi, &diagnostic, 3622 espstack->ipsecesp_netstack); 3623 if (error != 0) { 3624 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3625 diagnostic, ksi->ks_in_serial); 3626 } 3627 /* else esp_add_sa() took care of things. */ 3628 break; 3629 case SADB_DELETE: 3630 error = esp_del_sa(mp, ksi, &diagnostic, espstack); 3631 if (error != 0) { 3632 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3633 diagnostic, ksi->ks_in_serial); 3634 } 3635 /* Else esp_del_sa() took care of things. */ 3636 break; 3637 case SADB_GET: 3638 error = sadb_get_sa(mp, ksi, &espstack->esp_sadb, &diagnostic, 3639 espstack->esp_pfkey_q); 3640 if (error != 0) { 3641 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3642 diagnostic, ksi->ks_in_serial); 3643 } 3644 /* Else sadb_get_sa() took care of things. */ 3645 break; 3646 case SADB_FLUSH: 3647 sadbp_flush(&espstack->esp_sadb, espstack->ipsecesp_netstack); 3648 sadb_pfkey_echo(espstack->esp_pfkey_q, mp, samsg, ksi, NULL); 3649 break; 3650 case SADB_REGISTER: 3651 /* 3652 * Hmmm, let's do it! Check for extensions (there should 3653 * be none), extract the fields, call esp_register_out(), 3654 * then either free or report an error. 3655 * 3656 * Keysock takes care of the PF_KEY bookkeeping for this. 3657 */ 3658 if (esp_register_out(samsg->sadb_msg_seq, samsg->sadb_msg_pid, 3659 ksi->ks_in_serial, espstack)) { 3660 freemsg(mp); 3661 } else { 3662 /* 3663 * Only way this path hits is if there is a memory 3664 * failure. It will not return B_FALSE because of 3665 * lack of esp_pfkey_q if I am in wput(). 3666 */ 3667 sadb_pfkey_error(espstack->esp_pfkey_q, mp, ENOMEM, 3668 diagnostic, ksi->ks_in_serial); 3669 } 3670 break; 3671 case SADB_UPDATE: 3672 /* 3673 * Find a larval, if not there, find a full one and get 3674 * strict. 3675 */ 3676 error = esp_update_sa(mp, ksi, &diagnostic, espstack); 3677 if (error != 0) { 3678 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3679 diagnostic, ksi->ks_in_serial); 3680 } 3681 /* else esp_update_sa() took care of things. */ 3682 break; 3683 case SADB_GETSPI: 3684 /* 3685 * Reserve a new larval entry. 3686 */ 3687 esp_getspi(mp, ksi, espstack); 3688 break; 3689 case SADB_ACQUIRE: 3690 /* 3691 * Find larval and/or ACQUIRE record and kill it (them), I'm 3692 * most likely an error. Inbound ACQUIRE messages should only 3693 * have the base header. 3694 */ 3695 sadb_in_acquire(samsg, &espstack->esp_sadb, 3696 espstack->esp_pfkey_q, espstack->ipsecesp_netstack); 3697 freemsg(mp); 3698 break; 3699 case SADB_DUMP: 3700 /* 3701 * Dump all entries. 3702 */ 3703 esp_dump(mp, ksi, espstack); 3704 /* esp_dump will take care of the return message, etc. */ 3705 break; 3706 case SADB_EXPIRE: 3707 /* Should never reach me. */ 3708 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EOPNOTSUPP, 3709 diagnostic, ksi->ks_in_serial); 3710 break; 3711 default: 3712 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EINVAL, 3713 SADB_X_DIAGNOSTIC_UNKNOWN_MSG, ksi->ks_in_serial); 3714 break; 3715 } 3716 } 3717 3718 /* 3719 * Handle case where PF_KEY says it can't find a keysock for one of my 3720 * ACQUIRE messages. 3721 */ 3722 static void 3723 esp_keysock_no_socket(mblk_t *mp, ipsecesp_stack_t *espstack) 3724 { 3725 sadb_msg_t *samsg; 3726 keysock_out_err_t *kse = (keysock_out_err_t *)mp->b_rptr; 3727 3728 if (mp->b_cont == NULL) { 3729 freemsg(mp); 3730 return; 3731 } 3732 samsg = (sadb_msg_t *)mp->b_cont->b_rptr; 3733 3734 /* 3735 * If keysock can't find any registered, delete the acquire record 3736 * immediately, and handle errors. 3737 */ 3738 if (samsg->sadb_msg_type == SADB_ACQUIRE) { 3739 samsg->sadb_msg_errno = kse->ks_err_errno; 3740 samsg->sadb_msg_len = SADB_8TO64(sizeof (*samsg)); 3741 /* 3742 * Use the write-side of the esp_pfkey_q, in case there is 3743 * no esp_sadb.s_ip_q. 3744 */ 3745 sadb_in_acquire(samsg, &espstack->esp_sadb, 3746 WR(espstack->esp_pfkey_q), espstack->ipsecesp_netstack); 3747 } 3748 3749 freemsg(mp); 3750 } 3751 3752 /* 3753 * ESP module write put routine. 3754 */ 3755 static void 3756 ipsecesp_wput(queue_t *q, mblk_t *mp) 3757 { 3758 ipsec_info_t *ii; 3759 struct iocblk *iocp; 3760 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 3761 3762 esp3dbg(espstack, ("In esp_wput().\n")); 3763 3764 /* NOTE: Each case must take care of freeing or passing mp. */ 3765 switch (mp->b_datap->db_type) { 3766 case M_CTL: 3767 if ((mp->b_wptr - mp->b_rptr) < sizeof (ipsec_info_t)) { 3768 /* Not big enough message. */ 3769 freemsg(mp); 3770 break; 3771 } 3772 ii = (ipsec_info_t *)mp->b_rptr; 3773 3774 switch (ii->ipsec_info_type) { 3775 case KEYSOCK_OUT_ERR: 3776 esp1dbg(espstack, ("Got KEYSOCK_OUT_ERR message.\n")); 3777 esp_keysock_no_socket(mp, espstack); 3778 break; 3779 case KEYSOCK_IN: 3780 ESP_BUMP_STAT(espstack, keysock_in); 3781 esp3dbg(espstack, ("Got KEYSOCK_IN message.\n")); 3782 3783 /* Parse the message. */ 3784 esp_parse_pfkey(mp, espstack); 3785 break; 3786 case KEYSOCK_HELLO: 3787 sadb_keysock_hello(&espstack->esp_pfkey_q, q, mp, 3788 esp_ager, (void *)espstack, &espstack->esp_event, 3789 SADB_SATYPE_ESP); 3790 break; 3791 default: 3792 esp2dbg(espstack, ("Got M_CTL from above of 0x%x.\n", 3793 ii->ipsec_info_type)); 3794 freemsg(mp); 3795 break; 3796 } 3797 break; 3798 case M_IOCTL: 3799 iocp = (struct iocblk *)mp->b_rptr; 3800 switch (iocp->ioc_cmd) { 3801 case ND_SET: 3802 case ND_GET: 3803 if (nd_getset(q, espstack->ipsecesp_g_nd, mp)) { 3804 qreply(q, mp); 3805 return; 3806 } else { 3807 iocp->ioc_error = ENOENT; 3808 } 3809 /* FALLTHRU */ 3810 default: 3811 /* We really don't support any other ioctls, do we? */ 3812 3813 /* Return EINVAL */ 3814 if (iocp->ioc_error != ENOENT) 3815 iocp->ioc_error = EINVAL; 3816 iocp->ioc_count = 0; 3817 mp->b_datap->db_type = M_IOCACK; 3818 qreply(q, mp); 3819 return; 3820 } 3821 default: 3822 esp3dbg(espstack, 3823 ("Got default message, type %d, passing to IP.\n", 3824 mp->b_datap->db_type)); 3825 putnext(q, mp); 3826 } 3827 } 3828 3829 /* 3830 * Process an outbound ESP packet that can be accelerated by a IPsec 3831 * hardware acceleration capable Provider. 3832 * The caller already inserted and initialized the ESP header. 3833 * This function allocates a tagging M_CTL, and adds room at the end 3834 * of the packet to hold the ICV if authentication is needed. 3835 * 3836 * On success returns B_TRUE, on failure returns B_FALSE and frees the 3837 * mblk chain ipsec_out. 3838 */ 3839 static ipsec_status_t 3840 esp_outbound_accelerated(mblk_t *ipsec_out, uint_t icv_len) 3841 { 3842 ipsec_out_t *io; 3843 mblk_t *lastmp; 3844 netstack_t *ns; 3845 ipsecesp_stack_t *espstack; 3846 ipsec_stack_t *ipss; 3847 3848 io = (ipsec_out_t *)ipsec_out->b_rptr; 3849 ns = io->ipsec_out_ns; 3850 espstack = ns->netstack_ipsecesp; 3851 ipss = ns->netstack_ipsec; 3852 3853 ESP_BUMP_STAT(espstack, out_accelerated); 3854 3855 /* mark packet as being accelerated in IPSEC_OUT */ 3856 ASSERT(io->ipsec_out_accelerated == B_FALSE); 3857 io->ipsec_out_accelerated = B_TRUE; 3858 3859 /* 3860 * add room at the end of the packet for the ICV if needed 3861 */ 3862 if (icv_len > 0) { 3863 /* go to last mblk */ 3864 lastmp = ipsec_out; /* For following while loop. */ 3865 do { 3866 lastmp = lastmp->b_cont; 3867 } while (lastmp->b_cont != NULL); 3868 3869 /* if not enough available room, allocate new mblk */ 3870 if ((lastmp->b_wptr + icv_len) > lastmp->b_datap->db_lim) { 3871 lastmp->b_cont = allocb(icv_len, BPRI_HI); 3872 if (lastmp->b_cont == NULL) { 3873 ESP_BUMP_STAT(espstack, out_discards); 3874 ip_drop_packet(ipsec_out, B_FALSE, NULL, NULL, 3875 DROPPER(ipss, ipds_esp_nomem), 3876 &espstack->esp_dropper); 3877 return (IPSEC_STATUS_FAILED); 3878 } 3879 lastmp = lastmp->b_cont; 3880 } 3881 lastmp->b_wptr += icv_len; 3882 } 3883 3884 return (IPSEC_STATUS_SUCCESS); 3885 } 3886 3887 /* 3888 * Process an inbound accelerated ESP packet. 3889 * On success returns B_TRUE, on failure returns B_FALSE and frees the 3890 * mblk chain ipsec_in. 3891 */ 3892 static ipsec_status_t 3893 esp_inbound_accelerated(mblk_t *ipsec_in, mblk_t *data_mp, boolean_t isv4, 3894 ipsa_t *assoc) 3895 { 3896 ipsec_in_t *ii = (ipsec_in_t *)ipsec_in->b_rptr; 3897 mblk_t *hada_mp; 3898 uint32_t icv_len = 0; 3899 da_ipsec_t *hada; 3900 ipha_t *ipha; 3901 ip6_t *ip6h; 3902 kstat_named_t *counter; 3903 netstack_t *ns = ii->ipsec_in_ns; 3904 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3905 ipsec_stack_t *ipss = ns->netstack_ipsec; 3906 3907 ESP_BUMP_STAT(espstack, in_accelerated); 3908 3909 hada_mp = ii->ipsec_in_da; 3910 ASSERT(hada_mp != NULL); 3911 hada = (da_ipsec_t *)hada_mp->b_rptr; 3912 3913 /* 3914 * We only support one level of decapsulation in hardware, so 3915 * nuke the pointer. 3916 */ 3917 ii->ipsec_in_da = NULL; 3918 ii->ipsec_in_accelerated = B_FALSE; 3919 3920 if (assoc->ipsa_auth_alg != IPSA_AALG_NONE) { 3921 /* 3922 * ESP with authentication. We expect the Provider to have 3923 * computed the ICV and placed it in the hardware acceleration 3924 * data attributes. 3925 * 3926 * Extract ICV length from attributes M_CTL and sanity check 3927 * its value. We allow the mblk to be smaller than da_ipsec_t 3928 * for a small ICV, as long as the entire ICV fits within the 3929 * mblk. 3930 * 3931 * Also ensures that the ICV length computed by Provider 3932 * corresponds to the ICV length of the agorithm specified by 3933 * the SA. 3934 */ 3935 icv_len = hada->da_icv_len; 3936 if ((icv_len != assoc->ipsa_mac_len) || 3937 (icv_len > DA_ICV_MAX_LEN) || (MBLKL(hada_mp) < 3938 (sizeof (da_ipsec_t) - DA_ICV_MAX_LEN + icv_len))) { 3939 esp0dbg(("esp_inbound_accelerated: " 3940 "ICV len (%u) incorrect or mblk too small (%u)\n", 3941 icv_len, (uint32_t)(MBLKL(hada_mp)))); 3942 counter = DROPPER(ipss, ipds_esp_bad_auth); 3943 goto esp_in_discard; 3944 } 3945 } 3946 3947 /* get pointers to IP header */ 3948 if (isv4) { 3949 ipha = (ipha_t *)data_mp->b_rptr; 3950 } else { 3951 ip6h = (ip6_t *)data_mp->b_rptr; 3952 } 3953 3954 /* 3955 * Compare ICV in ESP packet vs ICV computed by adapter. 3956 * We also remove the ICV from the end of the packet since 3957 * it will no longer be needed. 3958 * 3959 * Assume that esp_inbound() already ensured that the pkt 3960 * was in one mblk. 3961 */ 3962 ASSERT(data_mp->b_cont == NULL); 3963 data_mp->b_wptr -= icv_len; 3964 /* adjust IP header */ 3965 if (isv4) 3966 ipha->ipha_length = htons(ntohs(ipha->ipha_length) - icv_len); 3967 else 3968 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) - icv_len); 3969 if (icv_len && bcmp(hada->da_icv, data_mp->b_wptr, icv_len)) { 3970 int af; 3971 void *addr; 3972 3973 if (isv4) { 3974 addr = &ipha->ipha_dst; 3975 af = AF_INET; 3976 } else { 3977 addr = &ip6h->ip6_dst; 3978 af = AF_INET6; 3979 } 3980 3981 /* 3982 * Log the event. Don't print to the console, block 3983 * potential denial-of-service attack. 3984 */ 3985 ESP_BUMP_STAT(espstack, bad_auth); 3986 ipsec_assocfailure(info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 3987 "ESP Authentication failed spi %x, dst_addr %s", 3988 assoc->ipsa_spi, addr, af, espstack->ipsecesp_netstack); 3989 counter = DROPPER(ipss, ipds_esp_bad_auth); 3990 goto esp_in_discard; 3991 } 3992 3993 esp3dbg(espstack, ("esp_inbound_accelerated: ESP authentication " 3994 "succeeded, checking replay\n")); 3995 3996 ipsec_in->b_cont = data_mp; 3997 3998 /* 3999 * Remove ESP header and padding from packet. 4000 */ 4001 if (!esp_strip_header(data_mp, ii->ipsec_in_v4, assoc->ipsa_iv_len, 4002 &counter, espstack)) { 4003 esp1dbg(espstack, ("esp_inbound_accelerated: " 4004 "esp_strip_header() failed\n")); 4005 goto esp_in_discard; 4006 } 4007 4008 freeb(hada_mp); 4009 4010 /* 4011 * Account for usage.. 4012 */ 4013 if (!esp_age_bytes(assoc, msgdsize(data_mp), B_TRUE)) { 4014 /* The ipsa has hit hard expiration, LOG and AUDIT. */ 4015 ESP_BUMP_STAT(espstack, bytes_expired); 4016 IP_ESP_BUMP_STAT(ipss, in_discards); 4017 ipsec_assocfailure(info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 4018 "ESP association 0x%x, dst %s had bytes expire.\n", 4019 assoc->ipsa_spi, assoc->ipsa_dstaddr, assoc->ipsa_addrfam, 4020 espstack->ipsecesp_netstack); 4021 ip_drop_packet(ipsec_in, B_TRUE, NULL, NULL, 4022 DROPPER(ipss, ipds_esp_bytes_expire), 4023 &espstack->esp_dropper); 4024 return (IPSEC_STATUS_FAILED); 4025 } 4026 4027 /* done processing the packet */ 4028 return (IPSEC_STATUS_SUCCESS); 4029 4030 esp_in_discard: 4031 IP_ESP_BUMP_STAT(ipss, in_discards); 4032 freeb(hada_mp); 4033 4034 ipsec_in->b_cont = data_mp; /* For ip_drop_packet()'s sake... */ 4035 ip_drop_packet(ipsec_in, B_TRUE, NULL, NULL, counter, 4036 &espstack->esp_dropper); 4037 4038 return (IPSEC_STATUS_FAILED); 4039 } 4040 4041 /* 4042 * Wrapper to allow IP to trigger an ESP association failure message 4043 * during inbound SA selection. 4044 */ 4045 void 4046 ipsecesp_in_assocfailure(mblk_t *mp, char level, ushort_t sl, char *fmt, 4047 uint32_t spi, void *addr, int af, ipsecesp_stack_t *espstack) 4048 { 4049 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 4050 4051 if (espstack->ipsecesp_log_unknown_spi) { 4052 ipsec_assocfailure(info.mi_idnum, 0, level, sl, fmt, spi, 4053 addr, af, espstack->ipsecesp_netstack); 4054 } 4055 4056 ip_drop_packet(mp, B_TRUE, NULL, NULL, 4057 DROPPER(ipss, ipds_esp_no_sa), 4058 &espstack->esp_dropper); 4059 } 4060 4061 /* 4062 * Initialize the ESP input and output processing functions. 4063 */ 4064 void 4065 ipsecesp_init_funcs(ipsa_t *sa) 4066 { 4067 if (sa->ipsa_output_func == NULL) 4068 sa->ipsa_output_func = esp_outbound; 4069 if (sa->ipsa_input_func == NULL) 4070 sa->ipsa_input_func = esp_inbound; 4071 } 4072