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 2008 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 uint_t hlen = IPH_HDR_LENGTH(ipha); 2152 2153 ASSERT(MBLKL(mp) >= sizeof (ipha_t)); 2154 2155 ipha->ipha_hdr_checksum = 0; 2156 ipha->ipha_hdr_checksum = ip_csum_hdr(ipha); 2157 2158 if (ns->netstack_udp->us_do_checksum) { 2159 ASSERT(MBLKL(udpmp) >= sizeof (udpha_t)); 2160 /* arr points to the IP header. */ 2161 arr = (uint16_t *)ipha; 2162 IP_STAT(ns->netstack_ip, ip_out_sw_cksum); 2163 IP_STAT_UPDATE(ns->netstack_ip, ip_udp_out_sw_cksum_bytes, 2164 ntohs(htons(ipha->ipha_length) - hlen)); 2165 /* arr[6-9] are the IP addresses. */ 2166 cksum = IP_UDP_CSUM_COMP + arr[6] + arr[7] + arr[8] + arr[9] + 2167 ntohs(htons(ipha->ipha_length) - hlen); 2168 cksum = IP_CSUM(mp, hlen, cksum); 2169 offset = hlen + UDP_CHECKSUM_OFFSET; 2170 while (offset >= MBLKL(udpmp)) { 2171 offset -= MBLKL(udpmp); 2172 udpmp = udpmp->b_cont; 2173 } 2174 /* arr points to the UDP header's checksum field. */ 2175 arr = (uint16_t *)(udpmp->b_rptr + offset); 2176 *arr = cksum; 2177 } 2178 } 2179 2180 /* 2181 * Send a one-byte UDP NAT-T keepalive. Construct an IPSEC_OUT too that'll 2182 * get fed into esp_send_udp/ip_wput_ipsec_out. 2183 */ 2184 void 2185 ipsecesp_send_keepalive(ipsa_t *assoc) 2186 { 2187 mblk_t *mp = NULL, *ipsec_mp = NULL; 2188 ipha_t *ipha; 2189 udpha_t *udpha; 2190 ipsec_out_t *io; 2191 2192 ASSERT(!MUTEX_HELD(&assoc->ipsa_lock)); 2193 2194 mp = allocb(sizeof (ipha_t) + sizeof (udpha_t) + 1, BPRI_HI); 2195 if (mp == NULL) 2196 return; 2197 ipha = (ipha_t *)mp->b_rptr; 2198 ipha->ipha_version_and_hdr_length = IP_SIMPLE_HDR_VERSION; 2199 ipha->ipha_type_of_service = 0; 2200 ipha->ipha_length = htons(sizeof (ipha_t) + sizeof (udpha_t) + 1); 2201 /* Use the low-16 of the SPI so we have some clue where it came from. */ 2202 ipha->ipha_ident = *(((uint16_t *)(&assoc->ipsa_spi)) + 1); 2203 ipha->ipha_fragment_offset_and_flags = 0; /* Too small to fragment! */ 2204 ipha->ipha_ttl = 0xFF; 2205 ipha->ipha_protocol = IPPROTO_UDP; 2206 ipha->ipha_hdr_checksum = 0; 2207 ipha->ipha_src = assoc->ipsa_srcaddr[0]; 2208 ipha->ipha_dst = assoc->ipsa_dstaddr[0]; 2209 udpha = (udpha_t *)(ipha + 1); 2210 udpha->uha_src_port = (assoc->ipsa_local_nat_port != 0) ? 2211 assoc->ipsa_local_nat_port : htons(IPPORT_IKE_NATT); 2212 udpha->uha_dst_port = (assoc->ipsa_remote_nat_port != 0) ? 2213 assoc->ipsa_remote_nat_port : htons(IPPORT_IKE_NATT); 2214 udpha->uha_length = htons(sizeof (udpha_t) + 1); 2215 udpha->uha_checksum = 0; 2216 mp->b_wptr = (uint8_t *)(udpha + 1); 2217 *(mp->b_wptr++) = 0xFF; 2218 2219 ipsec_mp = ipsec_alloc_ipsec_out(assoc->ipsa_netstack); 2220 if (ipsec_mp == NULL) { 2221 freeb(mp); 2222 return; 2223 } 2224 ipsec_mp->b_cont = mp; 2225 io = (ipsec_out_t *)ipsec_mp->b_rptr; 2226 io->ipsec_out_zoneid = 2227 netstackid_to_zoneid(assoc->ipsa_netstack->netstack_stackid); 2228 2229 esp_prepare_udp(assoc->ipsa_netstack, mp, ipha); 2230 ip_wput_ipsec_out(NULL, ipsec_mp, ipha, NULL, NULL); 2231 } 2232 2233 static ipsec_status_t 2234 esp_submit_req_outbound(mblk_t *ipsec_mp, ipsa_t *assoc, uchar_t *icv_buf, 2235 uint_t payload_len) 2236 { 2237 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 2238 uint_t auth_len; 2239 crypto_call_req_t call_req; 2240 mblk_t *esp_mp; 2241 int kef_rc = CRYPTO_FAILED; 2242 uint_t icv_len = assoc->ipsa_mac_len; 2243 crypto_ctx_template_t auth_ctx_tmpl; 2244 boolean_t do_auth; 2245 boolean_t do_encr; 2246 uint_t iv_len = assoc->ipsa_iv_len; 2247 crypto_ctx_template_t encr_ctx_tmpl; 2248 boolean_t is_natt = ((assoc->ipsa_flags & IPSA_F_NATT) != 0); 2249 size_t esph_offset = (is_natt ? UDPH_SIZE : 0); 2250 netstack_t *ns = io->ipsec_out_ns; 2251 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 2252 ipsec_stack_t *ipss = ns->netstack_ipsec; 2253 2254 esp3dbg(espstack, ("esp_submit_req_outbound:%s", 2255 is_natt ? "natt" : "not natt")); 2256 2257 ASSERT(io->ipsec_out_type == IPSEC_OUT); 2258 2259 /* 2260 * In case kEF queues and calls back, keep netstackid_t for 2261 * verification that the IP instance is still around in 2262 * esp_kcf_callback(). 2263 */ 2264 io->ipsec_out_stackid = ns->netstack_stackid; 2265 2266 do_encr = assoc->ipsa_encr_alg != SADB_EALG_NULL; 2267 do_auth = assoc->ipsa_auth_alg != SADB_AALG_NONE; 2268 2269 /* 2270 * Outbound IPsec packets are of the form: 2271 * IPSEC_OUT -> [IP,options] -> [ESP,IV] -> [data] -> [pad,ICV] 2272 * unless it's NATT, then it's 2273 * IPSEC_OUT -> [IP,options] -> [udp][ESP,IV] -> [data] -> [pad,ICV] 2274 * Get a pointer to the mblk containing the ESP header. 2275 */ 2276 ASSERT(ipsec_mp->b_cont != NULL && ipsec_mp->b_cont->b_cont != NULL); 2277 esp_mp = ipsec_mp->b_cont->b_cont; 2278 2279 ESP_INIT_CALLREQ(&call_req); 2280 2281 if (do_auth) { 2282 /* force asynchronous processing? */ 2283 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_AUTH] == 2284 IPSEC_ALGS_EXEC_ASYNC) 2285 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2286 2287 /* authentication context template */ 2288 IPSEC_CTX_TMPL(assoc, ipsa_authtmpl, IPSEC_ALG_AUTH, 2289 auth_ctx_tmpl); 2290 2291 /* where to store the computed mac */ 2292 ESP_INIT_CRYPTO_MAC(&io->ipsec_out_crypto_mac, 2293 icv_len, icv_buf); 2294 2295 /* authentication starts at the ESP header */ 2296 auth_len = payload_len + iv_len + sizeof (esph_t); 2297 if (!do_encr) { 2298 /* authentication only */ 2299 /* initialize input data argument */ 2300 ESP_INIT_CRYPTO_DATA(&io->ipsec_out_crypto_data, 2301 esp_mp, esph_offset, auth_len); 2302 2303 /* call the crypto framework */ 2304 kef_rc = crypto_mac(&assoc->ipsa_amech, 2305 &io->ipsec_out_crypto_data, 2306 &assoc->ipsa_kcfauthkey, auth_ctx_tmpl, 2307 &io->ipsec_out_crypto_mac, &call_req); 2308 } 2309 } 2310 2311 if (do_encr) { 2312 /* force asynchronous processing? */ 2313 if (ipss->ipsec_algs_exec_mode[IPSEC_ALG_ENCR] == 2314 IPSEC_ALGS_EXEC_ASYNC) 2315 call_req.cr_flag |= CRYPTO_ALWAYS_QUEUE; 2316 2317 /* encryption context template */ 2318 IPSEC_CTX_TMPL(assoc, ipsa_encrtmpl, IPSEC_ALG_ENCR, 2319 encr_ctx_tmpl); 2320 2321 if (!do_auth) { 2322 /* encryption only, skip mblk that contains ESP hdr */ 2323 /* initialize input data argument */ 2324 ESP_INIT_CRYPTO_DATA(&io->ipsec_out_crypto_data, 2325 esp_mp->b_cont, 0, payload_len); 2326 2327 /* specify IV */ 2328 io->ipsec_out_crypto_data.cd_miscdata = 2329 (char *)esp_mp->b_rptr + sizeof (esph_t) + 2330 esph_offset; 2331 2332 /* call the crypto framework */ 2333 kef_rc = crypto_encrypt(&assoc->ipsa_emech, 2334 &io->ipsec_out_crypto_data, 2335 &assoc->ipsa_kcfencrkey, encr_ctx_tmpl, 2336 NULL, &call_req); 2337 } 2338 } 2339 2340 if (do_auth && do_encr) { 2341 /* 2342 * Encryption and authentication: 2343 * Pass the pointer to the mblk chain starting at the ESP 2344 * header to the framework. Skip the ESP header mblk 2345 * for encryption, which is reflected by an encryption 2346 * offset equal to the length of that mblk. Start 2347 * the authentication at the ESP header, i.e. use an 2348 * authentication offset of zero. 2349 */ 2350 ESP_INIT_CRYPTO_DUAL_DATA(&io->ipsec_out_crypto_dual_data, 2351 esp_mp, MBLKL(esp_mp), payload_len, esph_offset, auth_len); 2352 2353 /* specify IV */ 2354 io->ipsec_out_crypto_dual_data.dd_miscdata = 2355 (char *)esp_mp->b_rptr + sizeof (esph_t) + esph_offset; 2356 2357 /* call the framework */ 2358 kef_rc = crypto_encrypt_mac(&assoc->ipsa_emech, 2359 &assoc->ipsa_amech, NULL, 2360 &assoc->ipsa_kcfencrkey, &assoc->ipsa_kcfauthkey, 2361 encr_ctx_tmpl, auth_ctx_tmpl, 2362 &io->ipsec_out_crypto_dual_data, 2363 &io->ipsec_out_crypto_mac, &call_req); 2364 } 2365 2366 switch (kef_rc) { 2367 case CRYPTO_SUCCESS: 2368 ESP_BUMP_STAT(espstack, crypto_sync); 2369 esp_set_usetime(assoc, B_FALSE); 2370 if (is_natt) 2371 esp_prepare_udp(ns, ipsec_mp->b_cont, 2372 (ipha_t *)ipsec_mp->b_cont->b_rptr); 2373 return (IPSEC_STATUS_SUCCESS); 2374 case CRYPTO_QUEUED: 2375 /* esp_kcf_callback() will be invoked on completion */ 2376 ESP_BUMP_STAT(espstack, crypto_async); 2377 return (IPSEC_STATUS_PENDING); 2378 } 2379 2380 esp_crypto_failed(ipsec_mp, B_TRUE, kef_rc, espstack); 2381 return (IPSEC_STATUS_FAILED); 2382 } 2383 2384 /* 2385 * Handle outbound IPsec processing for IPv4 and IPv6 2386 * On success returns B_TRUE, on failure returns B_FALSE and frees the 2387 * mblk chain ipsec_in_mp. 2388 */ 2389 static ipsec_status_t 2390 esp_outbound(mblk_t *mp) 2391 { 2392 mblk_t *ipsec_out_mp, *data_mp, *espmp, *tailmp; 2393 ipsec_out_t *io; 2394 ipha_t *ipha; 2395 ip6_t *ip6h; 2396 esph_t *esph; 2397 uint_t af; 2398 uint8_t *nhp; 2399 uintptr_t divpoint, datalen, adj, padlen, i, alloclen; 2400 uintptr_t esplen = sizeof (esph_t); 2401 uint8_t protocol; 2402 ipsa_t *assoc; 2403 uint_t iv_len, mac_len = 0; 2404 uchar_t *icv_buf; 2405 udpha_t *udpha; 2406 boolean_t is_natt = B_FALSE; 2407 netstack_t *ns; 2408 ipsecesp_stack_t *espstack; 2409 ipsec_stack_t *ipss; 2410 2411 ipsec_out_mp = mp; 2412 data_mp = ipsec_out_mp->b_cont; 2413 2414 io = (ipsec_out_t *)ipsec_out_mp->b_rptr; 2415 ns = io->ipsec_out_ns; 2416 espstack = ns->netstack_ipsecesp; 2417 ipss = ns->netstack_ipsec; 2418 2419 ESP_BUMP_STAT(espstack, out_requests); 2420 2421 /* 2422 * <sigh> We have to copy the message here, because TCP (for example) 2423 * keeps a dupb() of the message lying around for retransmission. 2424 * Since ESP changes the whole of the datagram, we have to create our 2425 * own copy lest we clobber TCP's data. Since we have to copy anyway, 2426 * we might as well make use of msgpullup() and get the mblk into one 2427 * contiguous piece! 2428 */ 2429 ipsec_out_mp->b_cont = msgpullup(data_mp, -1); 2430 if (ipsec_out_mp->b_cont == NULL) { 2431 esp0dbg(("esp_outbound: msgpullup() failed, " 2432 "dropping packet.\n")); 2433 ipsec_out_mp->b_cont = data_mp; 2434 /* 2435 * TODO: Find the outbound IRE for this packet and 2436 * pass it to ip_drop_packet(). 2437 */ 2438 ip_drop_packet(ipsec_out_mp, B_FALSE, NULL, NULL, 2439 DROPPER(ipss, ipds_esp_nomem), 2440 &espstack->esp_dropper); 2441 return (IPSEC_STATUS_FAILED); 2442 } else { 2443 freemsg(data_mp); 2444 data_mp = ipsec_out_mp->b_cont; 2445 } 2446 2447 /* 2448 * Reality check.... 2449 */ 2450 2451 ipha = (ipha_t *)data_mp->b_rptr; /* So we can call esp_acquire(). */ 2452 2453 if (io->ipsec_out_v4) { 2454 af = AF_INET; 2455 divpoint = IPH_HDR_LENGTH(ipha); 2456 datalen = ntohs(ipha->ipha_length) - divpoint; 2457 nhp = (uint8_t *)&ipha->ipha_protocol; 2458 } else { 2459 ip6_pkt_t ipp; 2460 2461 af = AF_INET6; 2462 ip6h = (ip6_t *)ipha; 2463 bzero(&ipp, sizeof (ipp)); 2464 divpoint = ip_find_hdr_v6(data_mp, ip6h, &ipp, NULL); 2465 if (ipp.ipp_dstopts != NULL && 2466 ipp.ipp_dstopts->ip6d_nxt != IPPROTO_ROUTING) { 2467 /* 2468 * Destination options are tricky. If we get in here, 2469 * then we have a terminal header following the 2470 * destination options. We need to adjust backwards 2471 * so we insert ESP BEFORE the destination options 2472 * bag. (So that the dstopts get encrypted!) 2473 * 2474 * Since this is for outbound packets only, we know 2475 * that non-terminal destination options only precede 2476 * routing headers. 2477 */ 2478 divpoint -= ipp.ipp_dstoptslen; 2479 } 2480 datalen = ntohs(ip6h->ip6_plen) + sizeof (ip6_t) - divpoint; 2481 2482 if (ipp.ipp_rthdr != NULL) { 2483 nhp = &ipp.ipp_rthdr->ip6r_nxt; 2484 } else if (ipp.ipp_hopopts != NULL) { 2485 nhp = &ipp.ipp_hopopts->ip6h_nxt; 2486 } else { 2487 ASSERT(divpoint == sizeof (ip6_t)); 2488 /* It's probably IP + ESP. */ 2489 nhp = &ip6h->ip6_nxt; 2490 } 2491 } 2492 assoc = io->ipsec_out_esp_sa; 2493 ASSERT(assoc != NULL); 2494 2495 if (assoc->ipsa_auth_alg != SADB_AALG_NONE) 2496 mac_len = assoc->ipsa_mac_len; 2497 2498 if (assoc->ipsa_flags & IPSA_F_NATT) { 2499 /* wedge in fake UDP */ 2500 is_natt = B_TRUE; 2501 esplen += UDPH_SIZE; 2502 } 2503 2504 /* 2505 * Set up ESP header and encryption padding for ENCR PI request. 2506 */ 2507 2508 /* Determine the padding length. Pad to 4-bytes for no-encryption. */ 2509 if (assoc->ipsa_encr_alg != SADB_EALG_NULL) { 2510 iv_len = assoc->ipsa_iv_len; 2511 2512 /* 2513 * Include the two additional bytes (hence the - 2) for the 2514 * padding length and the next header. Take this into account 2515 * when calculating the actual length of the padding. 2516 */ 2517 ASSERT(ISP2(iv_len)); 2518 padlen = ((unsigned)(iv_len - datalen - 2)) & (iv_len - 1); 2519 } else { 2520 iv_len = 0; 2521 padlen = ((unsigned)(sizeof (uint32_t) - datalen - 2)) & 2522 (sizeof (uint32_t) - 1); 2523 } 2524 2525 /* Allocate ESP header and IV. */ 2526 esplen += iv_len; 2527 2528 /* 2529 * Update association byte-count lifetimes. Don't forget to take 2530 * into account the padding length and next-header (hence the + 2). 2531 * 2532 * Use the amount of data fed into the "encryption algorithm". This 2533 * is the IV, the data length, the padding length, and the final two 2534 * bytes (padlen, and next-header). 2535 * 2536 */ 2537 2538 if (!esp_age_bytes(assoc, datalen + padlen + iv_len + 2, B_FALSE)) { 2539 /* 2540 * TODO: Find the outbound IRE for this packet and 2541 * pass it to ip_drop_packet(). 2542 */ 2543 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2544 DROPPER(ipss, ipds_esp_bytes_expire), 2545 &espstack->esp_dropper); 2546 return (IPSEC_STATUS_FAILED); 2547 } 2548 2549 espmp = allocb(esplen, BPRI_HI); 2550 if (espmp == NULL) { 2551 ESP_BUMP_STAT(espstack, out_discards); 2552 esp1dbg(espstack, ("esp_outbound: can't allocate espmp.\n")); 2553 /* 2554 * TODO: Find the outbound IRE for this packet and 2555 * pass it to ip_drop_packet(). 2556 */ 2557 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2558 DROPPER(ipss, ipds_esp_nomem), 2559 &espstack->esp_dropper); 2560 return (IPSEC_STATUS_FAILED); 2561 } 2562 espmp->b_wptr += esplen; 2563 esph = (esph_t *)espmp->b_rptr; 2564 2565 if (is_natt) { 2566 esp3dbg(espstack, ("esp_outbound: NATT")); 2567 2568 udpha = (udpha_t *)espmp->b_rptr; 2569 udpha->uha_src_port = (assoc->ipsa_local_nat_port != 0) ? 2570 assoc->ipsa_local_nat_port : htons(IPPORT_IKE_NATT); 2571 udpha->uha_dst_port = (assoc->ipsa_remote_nat_port != 0) ? 2572 assoc->ipsa_remote_nat_port : htons(IPPORT_IKE_NATT); 2573 /* 2574 * Set the checksum to 0, so that the esp_prepare_udp() call 2575 * can do the right thing. 2576 */ 2577 udpha->uha_checksum = 0; 2578 esph = (esph_t *)(udpha + 1); 2579 } 2580 2581 esph->esph_spi = assoc->ipsa_spi; 2582 2583 esph->esph_replay = htonl(atomic_add_32_nv(&assoc->ipsa_replay, 1)); 2584 if (esph->esph_replay == 0 && assoc->ipsa_replay_wsize != 0) { 2585 /* 2586 * XXX We have replay counter wrapping. 2587 * We probably want to nuke this SA (and its peer). 2588 */ 2589 ipsec_assocfailure(info.mi_idnum, 0, 0, 2590 SL_ERROR | SL_CONSOLE | SL_WARN, 2591 "Outbound ESP SA (0x%x, %s) has wrapped sequence.\n", 2592 esph->esph_spi, assoc->ipsa_dstaddr, af, 2593 espstack->ipsecesp_netstack); 2594 2595 ESP_BUMP_STAT(espstack, out_discards); 2596 sadb_replay_delete(assoc); 2597 /* 2598 * TODO: Find the outbound IRE for this packet and 2599 * pass it to ip_drop_packet(). 2600 */ 2601 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2602 DROPPER(ipss, ipds_esp_replay), 2603 &espstack->esp_dropper); 2604 return (IPSEC_STATUS_FAILED); 2605 } 2606 2607 /* 2608 * Set the IV to a random quantity. We do not require the 2609 * highest quality random bits, but for best security with CBC 2610 * mode ciphers, the value must be unlikely to repeat and also 2611 * must not be known in advance to an adversary capable of 2612 * influencing the plaintext. 2613 */ 2614 (void) random_get_pseudo_bytes((uint8_t *)(esph + 1), iv_len); 2615 2616 /* Fix the IP header. */ 2617 alloclen = padlen + 2 + mac_len; 2618 adj = alloclen + (espmp->b_wptr - espmp->b_rptr); 2619 2620 protocol = *nhp; 2621 2622 if (io->ipsec_out_v4) { 2623 ipha->ipha_length = htons(ntohs(ipha->ipha_length) + adj); 2624 if (is_natt) { 2625 *nhp = IPPROTO_UDP; 2626 udpha->uha_length = htons(ntohs(ipha->ipha_length) - 2627 IPH_HDR_LENGTH(ipha)); 2628 } else { 2629 *nhp = IPPROTO_ESP; 2630 } 2631 ipha->ipha_hdr_checksum = 0; 2632 ipha->ipha_hdr_checksum = (uint16_t)ip_csum_hdr(ipha); 2633 } else { 2634 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) + adj); 2635 *nhp = IPPROTO_ESP; 2636 } 2637 2638 /* I've got the two ESP mblks, now insert them. */ 2639 2640 esp2dbg(espstack, ("data_mp before outbound ESP adjustment:\n")); 2641 esp2dbg(espstack, (dump_msg(data_mp))); 2642 2643 if (!esp_insert_esp(data_mp, espmp, divpoint, espstack)) { 2644 ESP_BUMP_STAT(espstack, out_discards); 2645 /* NOTE: esp_insert_esp() only fails if there's no memory. */ 2646 /* 2647 * TODO: Find the outbound IRE for this packet and 2648 * pass it to ip_drop_packet(). 2649 */ 2650 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2651 DROPPER(ipss, ipds_esp_nomem), 2652 &espstack->esp_dropper); 2653 freeb(espmp); 2654 return (IPSEC_STATUS_FAILED); 2655 } 2656 2657 /* Append padding (and leave room for ICV). */ 2658 for (tailmp = data_mp; tailmp->b_cont != NULL; tailmp = tailmp->b_cont) 2659 ; 2660 if (tailmp->b_wptr + alloclen > tailmp->b_datap->db_lim) { 2661 tailmp->b_cont = allocb(alloclen, BPRI_HI); 2662 if (tailmp->b_cont == NULL) { 2663 ESP_BUMP_STAT(espstack, out_discards); 2664 esp0dbg(("esp_outbound: Can't allocate tailmp.\n")); 2665 /* 2666 * TODO: Find the outbound IRE for this packet and 2667 * pass it to ip_drop_packet(). 2668 */ 2669 ip_drop_packet(mp, B_FALSE, NULL, NULL, 2670 DROPPER(ipss, ipds_esp_nomem), 2671 &espstack->esp_dropper); 2672 return (IPSEC_STATUS_FAILED); 2673 } 2674 tailmp = tailmp->b_cont; 2675 } 2676 2677 /* 2678 * If there's padding, N bytes of padding must be of the form 0x1, 2679 * 0x2, 0x3... 0xN. 2680 */ 2681 for (i = 0; i < padlen; ) { 2682 i++; 2683 *tailmp->b_wptr++ = i; 2684 } 2685 *tailmp->b_wptr++ = i; 2686 *tailmp->b_wptr++ = protocol; 2687 2688 esp2dbg(espstack, ("data_Mp before encryption:\n")); 2689 esp2dbg(espstack, (dump_msg(data_mp))); 2690 2691 /* 2692 * The packet is eligible for hardware acceleration if the 2693 * following conditions are satisfied: 2694 * 2695 * 1. the packet will not be fragmented 2696 * 2. the provider supports the algorithms specified by SA 2697 * 3. there is no pending control message being exchanged 2698 * 4. snoop is not attached 2699 * 5. the destination address is not a multicast address 2700 * 2701 * All five of these conditions are checked by IP prior to 2702 * sending the packet to ESP. 2703 * 2704 * But We, and We Alone, can, nay MUST check if the packet 2705 * is over NATT, and then disqualify it from hardware 2706 * acceleration. 2707 */ 2708 2709 if (io->ipsec_out_is_capab_ill && !(assoc->ipsa_flags & IPSA_F_NATT)) { 2710 return (esp_outbound_accelerated(ipsec_out_mp, mac_len)); 2711 } 2712 ESP_BUMP_STAT(espstack, noaccel); 2713 2714 /* 2715 * Okay. I've set up the pre-encryption ESP. Let's do it! 2716 */ 2717 2718 if (mac_len > 0) { 2719 ASSERT(tailmp->b_wptr + mac_len <= tailmp->b_datap->db_lim); 2720 icv_buf = tailmp->b_wptr; 2721 tailmp->b_wptr += mac_len; 2722 } else { 2723 icv_buf = NULL; 2724 } 2725 2726 return (esp_submit_req_outbound(ipsec_out_mp, assoc, icv_buf, 2727 datalen + padlen + 2)); 2728 } 2729 2730 /* 2731 * IP calls this to validate the ICMP errors that 2732 * we got from the network. 2733 */ 2734 ipsec_status_t 2735 ipsecesp_icmp_error(mblk_t *ipsec_mp) 2736 { 2737 ipsec_in_t *ii = (ipsec_in_t *)ipsec_mp->b_rptr; 2738 boolean_t is_inbound = (ii->ipsec_in_type == IPSEC_IN); 2739 netstack_t *ns; 2740 ipsecesp_stack_t *espstack; 2741 ipsec_stack_t *ipss; 2742 2743 if (is_inbound) { 2744 ns = ii->ipsec_in_ns; 2745 } else { 2746 ipsec_out_t *io = (ipsec_out_t *)ipsec_mp->b_rptr; 2747 2748 ns = io->ipsec_out_ns; 2749 } 2750 espstack = ns->netstack_ipsecesp; 2751 ipss = ns->netstack_ipsec; 2752 2753 /* 2754 * Unless we get an entire packet back, this function is useless. 2755 * Why? 2756 * 2757 * 1.) Partial packets are useless, because the "next header" 2758 * is at the end of the decrypted ESP packet. Without the 2759 * whole packet, this is useless. 2760 * 2761 * 2.) If we every use a stateful cipher, such as a stream or a 2762 * one-time pad, we can't do anything. 2763 * 2764 * Since the chances of us getting an entire packet back are very 2765 * very small, we discard here. 2766 */ 2767 IP_ESP_BUMP_STAT(ipss, in_discards); 2768 ip_drop_packet(ipsec_mp, B_TRUE, NULL, NULL, 2769 DROPPER(ipss, ipds_esp_icmp), 2770 &espstack->esp_dropper); 2771 return (IPSEC_STATUS_FAILED); 2772 } 2773 2774 /* 2775 * ESP module read put routine. 2776 */ 2777 /* ARGSUSED */ 2778 static void 2779 ipsecesp_rput(queue_t *q, mblk_t *mp) 2780 { 2781 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 2782 2783 ASSERT(mp->b_datap->db_type != M_CTL); /* No more IRE_DB_REQ. */ 2784 2785 switch (mp->b_datap->db_type) { 2786 case M_PROTO: 2787 case M_PCPROTO: 2788 /* TPI message of some sort. */ 2789 switch (*((t_scalar_t *)mp->b_rptr)) { 2790 case T_BIND_ACK: 2791 esp3dbg(espstack, 2792 ("Thank you IP from ESP for T_BIND_ACK\n")); 2793 break; 2794 case T_ERROR_ACK: 2795 cmn_err(CE_WARN, 2796 "ipsecesp: ESP received T_ERROR_ACK from IP."); 2797 /* 2798 * Make esp_sadb.s_ip_q NULL, and in the 2799 * future, perhaps try again. 2800 */ 2801 espstack->esp_sadb.s_ip_q = NULL; 2802 break; 2803 case T_OK_ACK: 2804 /* Probably from a (rarely sent) T_UNBIND_REQ. */ 2805 break; 2806 default: 2807 esp0dbg(("Unknown M_{,PC}PROTO message.\n")); 2808 } 2809 freemsg(mp); 2810 break; 2811 default: 2812 /* For now, passthru message. */ 2813 esp2dbg(espstack, ("ESP got unknown mblk type %d.\n", 2814 mp->b_datap->db_type)); 2815 putnext(q, mp); 2816 } 2817 } 2818 2819 /* 2820 * Construct an SADB_REGISTER message with the current algorithms. 2821 */ 2822 static boolean_t 2823 esp_register_out(uint32_t sequence, uint32_t pid, uint_t serial, 2824 ipsecesp_stack_t *espstack) 2825 { 2826 mblk_t *pfkey_msg_mp, *keysock_out_mp; 2827 sadb_msg_t *samsg; 2828 sadb_supported_t *sasupp_auth = NULL; 2829 sadb_supported_t *sasupp_encr = NULL; 2830 sadb_alg_t *saalg; 2831 uint_t allocsize = sizeof (*samsg); 2832 uint_t i, numalgs_snap; 2833 int current_aalgs; 2834 ipsec_alginfo_t **authalgs; 2835 uint_t num_aalgs; 2836 int current_ealgs; 2837 ipsec_alginfo_t **encralgs; 2838 uint_t num_ealgs; 2839 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 2840 2841 /* Allocate the KEYSOCK_OUT. */ 2842 keysock_out_mp = sadb_keysock_out(serial); 2843 if (keysock_out_mp == NULL) { 2844 esp0dbg(("esp_register_out: couldn't allocate mblk.\n")); 2845 return (B_FALSE); 2846 } 2847 2848 /* 2849 * Allocate the PF_KEY message that follows KEYSOCK_OUT. 2850 */ 2851 2852 mutex_enter(&ipss->ipsec_alg_lock); 2853 2854 /* 2855 * Fill SADB_REGISTER message's algorithm descriptors. Hold 2856 * down the lock while filling it. 2857 * 2858 * Return only valid algorithms, so the number of algorithms 2859 * to send up may be less than the number of algorithm entries 2860 * in the table. 2861 */ 2862 authalgs = ipss->ipsec_alglists[IPSEC_ALG_AUTH]; 2863 for (num_aalgs = 0, i = 0; i < IPSEC_MAX_ALGS; i++) 2864 if (authalgs[i] != NULL && ALG_VALID(authalgs[i])) 2865 num_aalgs++; 2866 2867 if (num_aalgs != 0) { 2868 allocsize += (num_aalgs * sizeof (*saalg)); 2869 allocsize += sizeof (*sasupp_auth); 2870 } 2871 encralgs = ipss->ipsec_alglists[IPSEC_ALG_ENCR]; 2872 for (num_ealgs = 0, i = 0; i < IPSEC_MAX_ALGS; i++) 2873 if (encralgs[i] != NULL && ALG_VALID(encralgs[i])) 2874 num_ealgs++; 2875 2876 if (num_ealgs != 0) { 2877 allocsize += (num_ealgs * sizeof (*saalg)); 2878 allocsize += sizeof (*sasupp_encr); 2879 } 2880 keysock_out_mp->b_cont = allocb(allocsize, BPRI_HI); 2881 if (keysock_out_mp->b_cont == NULL) { 2882 mutex_exit(&ipss->ipsec_alg_lock); 2883 freemsg(keysock_out_mp); 2884 return (B_FALSE); 2885 } 2886 2887 pfkey_msg_mp = keysock_out_mp->b_cont; 2888 pfkey_msg_mp->b_wptr += allocsize; 2889 if (num_aalgs != 0) { 2890 sasupp_auth = (sadb_supported_t *) 2891 (pfkey_msg_mp->b_rptr + sizeof (*samsg)); 2892 saalg = (sadb_alg_t *)(sasupp_auth + 1); 2893 2894 ASSERT(((ulong_t)saalg & 0x7) == 0); 2895 2896 numalgs_snap = 0; 2897 for (i = 0; 2898 ((i < IPSEC_MAX_ALGS) && (numalgs_snap < num_aalgs)); 2899 i++) { 2900 if (authalgs[i] == NULL || !ALG_VALID(authalgs[i])) 2901 continue; 2902 2903 saalg->sadb_alg_id = authalgs[i]->alg_id; 2904 saalg->sadb_alg_ivlen = 0; 2905 saalg->sadb_alg_minbits = authalgs[i]->alg_ef_minbits; 2906 saalg->sadb_alg_maxbits = authalgs[i]->alg_ef_maxbits; 2907 saalg->sadb_x_alg_defincr = authalgs[i]->alg_ef_default; 2908 saalg->sadb_x_alg_increment = 2909 authalgs[i]->alg_increment; 2910 numalgs_snap++; 2911 saalg++; 2912 } 2913 ASSERT(numalgs_snap == num_aalgs); 2914 #ifdef DEBUG 2915 /* 2916 * Reality check to make sure I snagged all of the 2917 * algorithms. 2918 */ 2919 for (; i < IPSEC_MAX_ALGS; i++) { 2920 if (authalgs[i] != NULL && ALG_VALID(authalgs[i])) { 2921 cmn_err(CE_PANIC, "esp_register_out()! " 2922 "Missed aalg #%d.\n", i); 2923 } 2924 } 2925 #endif /* DEBUG */ 2926 } else { 2927 saalg = (sadb_alg_t *)(pfkey_msg_mp->b_rptr + sizeof (*samsg)); 2928 } 2929 2930 if (num_ealgs != 0) { 2931 sasupp_encr = (sadb_supported_t *)saalg; 2932 saalg = (sadb_alg_t *)(sasupp_encr + 1); 2933 2934 numalgs_snap = 0; 2935 for (i = 0; 2936 ((i < IPSEC_MAX_ALGS) && (numalgs_snap < num_ealgs)); i++) { 2937 if (encralgs[i] == NULL || !ALG_VALID(encralgs[i])) 2938 continue; 2939 saalg->sadb_alg_id = encralgs[i]->alg_id; 2940 saalg->sadb_alg_ivlen = encralgs[i]->alg_datalen; 2941 saalg->sadb_alg_minbits = encralgs[i]->alg_ef_minbits; 2942 saalg->sadb_alg_maxbits = encralgs[i]->alg_ef_maxbits; 2943 saalg->sadb_x_alg_defincr = encralgs[i]->alg_ef_default; 2944 saalg->sadb_x_alg_increment = 2945 encralgs[i]->alg_increment; 2946 numalgs_snap++; 2947 saalg++; 2948 } 2949 ASSERT(numalgs_snap == num_ealgs); 2950 #ifdef DEBUG 2951 /* 2952 * Reality check to make sure I snagged all of the 2953 * algorithms. 2954 */ 2955 for (; i < IPSEC_MAX_ALGS; i++) { 2956 if (encralgs[i] != NULL && ALG_VALID(encralgs[i])) { 2957 cmn_err(CE_PANIC, "esp_register_out()! " 2958 "Missed ealg #%d.\n", i); 2959 } 2960 } 2961 #endif /* DEBUG */ 2962 } 2963 2964 current_aalgs = num_aalgs; 2965 current_ealgs = num_ealgs; 2966 2967 mutex_exit(&ipss->ipsec_alg_lock); 2968 2969 /* Now fill the rest of the SADB_REGISTER message. */ 2970 2971 samsg = (sadb_msg_t *)pfkey_msg_mp->b_rptr; 2972 samsg->sadb_msg_version = PF_KEY_V2; 2973 samsg->sadb_msg_type = SADB_REGISTER; 2974 samsg->sadb_msg_errno = 0; 2975 samsg->sadb_msg_satype = SADB_SATYPE_ESP; 2976 samsg->sadb_msg_len = SADB_8TO64(allocsize); 2977 samsg->sadb_msg_reserved = 0; 2978 /* 2979 * Assume caller has sufficient sequence/pid number info. If it's one 2980 * from me over a new alg., I could give two hoots about sequence. 2981 */ 2982 samsg->sadb_msg_seq = sequence; 2983 samsg->sadb_msg_pid = pid; 2984 2985 if (sasupp_auth != NULL) { 2986 sasupp_auth->sadb_supported_len = SADB_8TO64( 2987 sizeof (*sasupp_auth) + sizeof (*saalg) * current_aalgs); 2988 sasupp_auth->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; 2989 sasupp_auth->sadb_supported_reserved = 0; 2990 } 2991 2992 if (sasupp_encr != NULL) { 2993 sasupp_encr->sadb_supported_len = SADB_8TO64( 2994 sizeof (*sasupp_encr) + sizeof (*saalg) * current_ealgs); 2995 sasupp_encr->sadb_supported_exttype = 2996 SADB_EXT_SUPPORTED_ENCRYPT; 2997 sasupp_encr->sadb_supported_reserved = 0; 2998 } 2999 3000 if (espstack->esp_pfkey_q != NULL) 3001 putnext(espstack->esp_pfkey_q, keysock_out_mp); 3002 else { 3003 freemsg(keysock_out_mp); 3004 return (B_FALSE); 3005 } 3006 3007 return (B_TRUE); 3008 } 3009 3010 /* 3011 * Invoked when the algorithm table changes. Causes SADB_REGISTER 3012 * messages continaining the current list of algorithms to be 3013 * sent up to the ESP listeners. 3014 */ 3015 void 3016 ipsecesp_algs_changed(netstack_t *ns) 3017 { 3018 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3019 3020 /* 3021 * Time to send a PF_KEY SADB_REGISTER message to ESP listeners 3022 * everywhere. (The function itself checks for NULL esp_pfkey_q.) 3023 */ 3024 (void) esp_register_out(0, 0, 0, espstack); 3025 } 3026 3027 /* 3028 * taskq_dispatch handler. 3029 */ 3030 static void 3031 inbound_task(void *arg) 3032 { 3033 esph_t *esph; 3034 mblk_t *mp = (mblk_t *)arg; 3035 ipsec_in_t *ii = (ipsec_in_t *)mp->b_rptr; 3036 netstack_t *ns = ii->ipsec_in_ns; 3037 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3038 int ipsec_rc; 3039 3040 esp2dbg(espstack, ("in ESP inbound_task")); 3041 ASSERT(espstack != NULL); 3042 3043 esph = ipsec_inbound_esp_sa(mp, ns); 3044 if (esph == NULL) 3045 return; 3046 ASSERT(ii->ipsec_in_esp_sa != NULL); 3047 ipsec_rc = ii->ipsec_in_esp_sa->ipsa_input_func(mp, esph); 3048 if (ipsec_rc != IPSEC_STATUS_SUCCESS) 3049 return; 3050 ip_fanout_proto_again(mp, NULL, NULL, NULL); 3051 } 3052 3053 /* 3054 * Now that weak-key passed, actually ADD the security association, and 3055 * send back a reply ADD message. 3056 */ 3057 static int 3058 esp_add_sa_finish(mblk_t *mp, sadb_msg_t *samsg, keysock_in_t *ksi, 3059 int *diagnostic, ipsecesp_stack_t *espstack) 3060 { 3061 isaf_t *primary = NULL, *secondary, *inbound, *outbound; 3062 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3063 sadb_address_t *dstext = 3064 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3065 struct sockaddr_in *dst; 3066 struct sockaddr_in6 *dst6; 3067 boolean_t is_ipv4, clone = B_FALSE, is_inbound = B_FALSE; 3068 uint32_t *dstaddr; 3069 ipsa_t *larval = NULL; 3070 ipsacq_t *acqrec; 3071 iacqf_t *acq_bucket; 3072 mblk_t *acq_msgs = NULL; 3073 int rc; 3074 sadb_t *sp; 3075 int outhash; 3076 mblk_t *lpkt; 3077 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 3078 3079 /* 3080 * Locate the appropriate table(s). 3081 */ 3082 3083 dst = (struct sockaddr_in *)(dstext + 1); 3084 dst6 = (struct sockaddr_in6 *)dst; 3085 is_ipv4 = (dst->sin_family == AF_INET); 3086 if (is_ipv4) { 3087 sp = &espstack->esp_sadb.s_v4; 3088 dstaddr = (uint32_t *)(&dst->sin_addr); 3089 outhash = OUTBOUND_HASH_V4(sp, *(ipaddr_t *)dstaddr); 3090 } else { 3091 sp = &espstack->esp_sadb.s_v6; 3092 dstaddr = (uint32_t *)(&dst6->sin6_addr); 3093 outhash = OUTBOUND_HASH_V6(sp, *(in6_addr_t *)dstaddr); 3094 } 3095 3096 inbound = INBOUND_BUCKET(sp, assoc->sadb_sa_spi); 3097 outbound = &sp->sdb_of[outhash]; 3098 3099 /* 3100 * Use the direction flags provided by the KMD to determine 3101 * if the inbound or outbound table should be the primary 3102 * for this SA. If these flags were absent then make this 3103 * decision based on the addresses. 3104 */ 3105 if (assoc->sadb_sa_flags & IPSA_F_INBOUND) { 3106 primary = inbound; 3107 secondary = outbound; 3108 is_inbound = B_TRUE; 3109 if (assoc->sadb_sa_flags & IPSA_F_OUTBOUND) 3110 clone = B_TRUE; 3111 } else { 3112 if (assoc->sadb_sa_flags & IPSA_F_OUTBOUND) { 3113 primary = outbound; 3114 secondary = inbound; 3115 } 3116 } 3117 3118 if (primary == NULL) { 3119 /* 3120 * The KMD did not set a direction flag, determine which 3121 * table to insert the SA into based on addresses. 3122 */ 3123 switch (ksi->ks_in_dsttype) { 3124 case KS_IN_ADDR_MBCAST: 3125 clone = B_TRUE; /* All mcast SAs can be bidirectional */ 3126 assoc->sadb_sa_flags |= IPSA_F_OUTBOUND; 3127 /* FALLTHRU */ 3128 /* 3129 * If the source address is either one of mine, or unspecified 3130 * (which is best summed up by saying "not 'not mine'"), 3131 * then the association is potentially bi-directional, 3132 * in that it can be used for inbound traffic and outbound 3133 * traffic. The best example of such an SA is a multicast 3134 * SA (which allows me to receive the outbound traffic). 3135 */ 3136 case KS_IN_ADDR_ME: 3137 assoc->sadb_sa_flags |= IPSA_F_INBOUND; 3138 primary = inbound; 3139 secondary = outbound; 3140 if (ksi->ks_in_srctype != KS_IN_ADDR_NOTME) 3141 clone = B_TRUE; 3142 is_inbound = B_TRUE; 3143 break; 3144 /* 3145 * If the source address literally not mine (either 3146 * unspecified or not mine), then this SA may have an 3147 * address that WILL be mine after some configuration. 3148 * We pay the price for this by making it a bi-directional 3149 * SA. 3150 */ 3151 case KS_IN_ADDR_NOTME: 3152 assoc->sadb_sa_flags |= IPSA_F_OUTBOUND; 3153 primary = outbound; 3154 secondary = inbound; 3155 if (ksi->ks_in_srctype != KS_IN_ADDR_ME) { 3156 assoc->sadb_sa_flags |= IPSA_F_INBOUND; 3157 clone = B_TRUE; 3158 } 3159 break; 3160 default: 3161 *diagnostic = SADB_X_DIAGNOSTIC_BAD_DST; 3162 return (EINVAL); 3163 } 3164 } 3165 3166 /* 3167 * Find a ACQUIRE list entry if possible. If we've added an SA that 3168 * suits the needs of an ACQUIRE list entry, we can eliminate the 3169 * ACQUIRE list entry and transmit the enqueued packets. Use the 3170 * high-bit of the sequence number to queue it. Key off destination 3171 * addr, and change acqrec's state. 3172 */ 3173 3174 if (samsg->sadb_msg_seq & IACQF_LOWEST_SEQ) { 3175 acq_bucket = &sp->sdb_acq[outhash]; 3176 mutex_enter(&acq_bucket->iacqf_lock); 3177 for (acqrec = acq_bucket->iacqf_ipsacq; acqrec != NULL; 3178 acqrec = acqrec->ipsacq_next) { 3179 mutex_enter(&acqrec->ipsacq_lock); 3180 /* 3181 * Q: I only check sequence. Should I check dst? 3182 * A: Yes, check dest because those are the packets 3183 * that are queued up. 3184 */ 3185 if (acqrec->ipsacq_seq == samsg->sadb_msg_seq && 3186 IPSA_ARE_ADDR_EQUAL(dstaddr, 3187 acqrec->ipsacq_dstaddr, acqrec->ipsacq_addrfam)) 3188 break; 3189 mutex_exit(&acqrec->ipsacq_lock); 3190 } 3191 if (acqrec != NULL) { 3192 /* 3193 * AHA! I found an ACQUIRE record for this SA. 3194 * Grab the msg list, and free the acquire record. 3195 * I already am holding the lock for this record, 3196 * so all I have to do is free it. 3197 */ 3198 acq_msgs = acqrec->ipsacq_mp; 3199 acqrec->ipsacq_mp = NULL; 3200 mutex_exit(&acqrec->ipsacq_lock); 3201 sadb_destroy_acquire(acqrec, 3202 espstack->ipsecesp_netstack); 3203 } 3204 mutex_exit(&acq_bucket->iacqf_lock); 3205 } 3206 3207 /* 3208 * Find PF_KEY message, and see if I'm an update. If so, find entry 3209 * in larval list (if there). 3210 */ 3211 3212 if (samsg->sadb_msg_type == SADB_UPDATE) { 3213 mutex_enter(&inbound->isaf_lock); 3214 larval = ipsec_getassocbyspi(inbound, assoc->sadb_sa_spi, 3215 ALL_ZEROES_PTR, dstaddr, dst->sin_family); 3216 mutex_exit(&inbound->isaf_lock); 3217 3218 if (larval == NULL) { 3219 *diagnostic = SADB_X_DIAGNOSTIC_SA_NOTFOUND; 3220 esp0dbg(("Larval update, but larval disappeared.\n")); 3221 return (ESRCH); 3222 } /* Else sadb_common_add unlinks it for me! */ 3223 } 3224 3225 lpkt = NULL; 3226 if (larval != NULL) 3227 lpkt = sadb_clear_lpkt(larval); 3228 3229 rc = sadb_common_add(espstack->esp_sadb.s_ip_q, espstack->esp_pfkey_q, 3230 mp, samsg, ksi, primary, secondary, larval, clone, is_inbound, 3231 diagnostic, espstack->ipsecesp_netstack, &espstack->esp_sadb); 3232 3233 if (rc == 0 && lpkt != NULL) { 3234 rc = !taskq_dispatch(esp_taskq, inbound_task, 3235 (void *) lpkt, TQ_NOSLEEP); 3236 } 3237 3238 if (rc != 0) { 3239 ip_drop_packet(lpkt, B_TRUE, NULL, NULL, 3240 DROPPER(ipss, ipds_sadb_inlarval_timeout), 3241 &espstack->esp_dropper); 3242 } 3243 3244 /* 3245 * How much more stack will I create with all of these 3246 * esp_outbound() calls? 3247 */ 3248 3249 while (acq_msgs != NULL) { 3250 mblk_t *mp = acq_msgs; 3251 3252 acq_msgs = acq_msgs->b_next; 3253 mp->b_next = NULL; 3254 if (rc == 0) { 3255 if (ipsec_outbound_sa(mp, IPPROTO_ESP)) { 3256 ((ipsec_out_t *)(mp->b_rptr))-> 3257 ipsec_out_esp_done = B_TRUE; 3258 if (esp_outbound(mp) == IPSEC_STATUS_SUCCESS) { 3259 ipha_t *ipha; 3260 3261 /* do AH processing if needed */ 3262 if (!esp_do_outbound_ah(mp)) 3263 continue; 3264 3265 ipha = (ipha_t *)mp->b_cont->b_rptr; 3266 3267 /* finish IPsec processing */ 3268 if (is_ipv4) { 3269 ip_wput_ipsec_out(NULL, mp, 3270 ipha, NULL, NULL); 3271 } else { 3272 ip6_t *ip6h = (ip6_t *)ipha; 3273 ip_wput_ipsec_out_v6(NULL, 3274 mp, ip6h, NULL, NULL); 3275 } 3276 } 3277 continue; 3278 } 3279 } 3280 ESP_BUMP_STAT(espstack, out_discards); 3281 ip_drop_packet(mp, B_FALSE, NULL, NULL, 3282 DROPPER(ipss, ipds_sadb_acquire_timeout), 3283 &espstack->esp_dropper); 3284 } 3285 3286 return (rc); 3287 } 3288 3289 /* 3290 * Add new ESP security association. This may become a generic AH/ESP 3291 * routine eventually. 3292 */ 3293 static int 3294 esp_add_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, netstack_t *ns) 3295 { 3296 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3297 sadb_address_t *srcext = 3298 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_SRC]; 3299 sadb_address_t *dstext = 3300 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3301 sadb_address_t *isrcext = 3302 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_INNER_SRC]; 3303 sadb_address_t *idstext = 3304 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_INNER_DST]; 3305 sadb_address_t *nttext_loc = 3306 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_NATT_LOC]; 3307 sadb_address_t *nttext_rem = 3308 (sadb_address_t *)ksi->ks_in_extv[SADB_X_EXT_ADDRESS_NATT_REM]; 3309 sadb_key_t *akey = (sadb_key_t *)ksi->ks_in_extv[SADB_EXT_KEY_AUTH]; 3310 sadb_key_t *ekey = (sadb_key_t *)ksi->ks_in_extv[SADB_EXT_KEY_ENCRYPT]; 3311 struct sockaddr_in *src, *dst; 3312 struct sockaddr_in *natt_loc, *natt_rem; 3313 struct sockaddr_in6 *natt_loc6, *natt_rem6; 3314 sadb_lifetime_t *soft = 3315 (sadb_lifetime_t *)ksi->ks_in_extv[SADB_EXT_LIFETIME_SOFT]; 3316 sadb_lifetime_t *hard = 3317 (sadb_lifetime_t *)ksi->ks_in_extv[SADB_EXT_LIFETIME_HARD]; 3318 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3319 ipsec_stack_t *ipss = ns->netstack_ipsec; 3320 3321 /* I need certain extensions present for an ADD message. */ 3322 if (srcext == NULL) { 3323 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SRC; 3324 return (EINVAL); 3325 } 3326 if (dstext == NULL) { 3327 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_DST; 3328 return (EINVAL); 3329 } 3330 if (isrcext == NULL && idstext != NULL) { 3331 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_INNER_SRC; 3332 return (EINVAL); 3333 } 3334 if (isrcext != NULL && idstext == NULL) { 3335 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_INNER_DST; 3336 return (EINVAL); 3337 } 3338 if (assoc == NULL) { 3339 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SA; 3340 return (EINVAL); 3341 } 3342 if (ekey == NULL && assoc->sadb_sa_encrypt != SADB_EALG_NULL) { 3343 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_EKEY; 3344 return (EINVAL); 3345 } 3346 3347 src = (struct sockaddr_in *)(srcext + 1); 3348 dst = (struct sockaddr_in *)(dstext + 1); 3349 natt_loc = (struct sockaddr_in *)(nttext_loc + 1); 3350 natt_loc6 = (struct sockaddr_in6 *)(nttext_loc + 1); 3351 natt_rem = (struct sockaddr_in *)(nttext_rem + 1); 3352 natt_rem6 = (struct sockaddr_in6 *)(nttext_rem + 1); 3353 3354 /* Sundry ADD-specific reality checks. */ 3355 /* XXX STATS : Logging/stats here? */ 3356 if (assoc->sadb_sa_state != SADB_SASTATE_MATURE) { 3357 *diagnostic = SADB_X_DIAGNOSTIC_BAD_SASTATE; 3358 return (EINVAL); 3359 } 3360 if (assoc->sadb_sa_encrypt == SADB_EALG_NONE) { 3361 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EALG; 3362 return (EINVAL); 3363 } 3364 3365 if (assoc->sadb_sa_encrypt == SADB_EALG_NULL && 3366 assoc->sadb_sa_auth == SADB_AALG_NONE) { 3367 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AALG; 3368 return (EINVAL); 3369 } 3370 3371 if (assoc->sadb_sa_flags & ~(SADB_SAFLAGS_NOREPLAY | 3372 SADB_X_SAFLAGS_NATT_LOC | SADB_X_SAFLAGS_NATT_REM | 3373 SADB_X_SAFLAGS_TUNNEL | SADB_X_SAFLAGS_OUTBOUND | 3374 SADB_X_SAFLAGS_INBOUND | SADB_X_SAFLAGS_PAIRED)) { 3375 *diagnostic = SADB_X_DIAGNOSTIC_BAD_SAFLAGS; 3376 return (EINVAL); 3377 } 3378 3379 if ((*diagnostic = sadb_hardsoftchk(hard, soft)) != 0) { 3380 return (EINVAL); 3381 } 3382 ASSERT(src->sin_family == dst->sin_family); 3383 3384 if (assoc->sadb_sa_flags & SADB_X_SAFLAGS_NATT_LOC) { 3385 if (nttext_loc == NULL) { 3386 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_NATT_LOC; 3387 return (EINVAL); 3388 } 3389 3390 if (natt_loc->sin_family == AF_INET6 && 3391 !IN6_IS_ADDR_V4MAPPED(&natt_loc6->sin6_addr)) { 3392 *diagnostic = SADB_X_DIAGNOSTIC_MALFORMED_NATT_LOC; 3393 return (EINVAL); 3394 } 3395 } 3396 3397 if (assoc->sadb_sa_flags & SADB_X_SAFLAGS_NATT_REM) { 3398 if (nttext_rem == NULL) { 3399 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_NATT_REM; 3400 return (EINVAL); 3401 } 3402 if (natt_rem->sin_family == AF_INET6 && 3403 !IN6_IS_ADDR_V4MAPPED(&natt_rem6->sin6_addr)) { 3404 *diagnostic = SADB_X_DIAGNOSTIC_MALFORMED_NATT_REM; 3405 return (EINVAL); 3406 } 3407 } 3408 3409 3410 /* Stuff I don't support, for now. XXX Diagnostic? */ 3411 if (ksi->ks_in_extv[SADB_EXT_LIFETIME_CURRENT] != NULL || 3412 ksi->ks_in_extv[SADB_EXT_SENSITIVITY] != NULL) 3413 return (EOPNOTSUPP); 3414 3415 /* 3416 * XXX Policy : I'm not checking identities or sensitivity 3417 * labels at this time, but if I did, I'd do them here, before I sent 3418 * the weak key check up to the algorithm. 3419 */ 3420 3421 mutex_enter(&ipss->ipsec_alg_lock); 3422 3423 /* 3424 * First locate the authentication algorithm. 3425 */ 3426 if (akey != NULL) { 3427 ipsec_alginfo_t *aalg; 3428 3429 aalg = ipss->ipsec_alglists[IPSEC_ALG_AUTH] 3430 [assoc->sadb_sa_auth]; 3431 if (aalg == NULL || !ALG_VALID(aalg)) { 3432 mutex_exit(&ipss->ipsec_alg_lock); 3433 esp1dbg(espstack, ("Couldn't find auth alg #%d.\n", 3434 assoc->sadb_sa_auth)); 3435 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AALG; 3436 return (EINVAL); 3437 } 3438 3439 /* 3440 * Sanity check key sizes. 3441 * Note: It's not possible to use SADB_AALG_NONE because 3442 * this auth_alg is not defined with ALG_FLAG_VALID. If this 3443 * ever changes, the same check for SADB_AALG_NONE and 3444 * a auth_key != NULL should be made here ( see below). 3445 */ 3446 if (!ipsec_valid_key_size(akey->sadb_key_bits, aalg)) { 3447 mutex_exit(&ipss->ipsec_alg_lock); 3448 *diagnostic = SADB_X_DIAGNOSTIC_BAD_AKEYBITS; 3449 return (EINVAL); 3450 } 3451 ASSERT(aalg->alg_mech_type != CRYPTO_MECHANISM_INVALID); 3452 3453 /* check key and fix parity if needed */ 3454 if (ipsec_check_key(aalg->alg_mech_type, akey, B_TRUE, 3455 diagnostic) != 0) { 3456 mutex_exit(&ipss->ipsec_alg_lock); 3457 return (EINVAL); 3458 } 3459 } 3460 3461 /* 3462 * Then locate the encryption algorithm. 3463 */ 3464 if (ekey != NULL) { 3465 ipsec_alginfo_t *ealg; 3466 3467 ealg = ipss->ipsec_alglists[IPSEC_ALG_ENCR] 3468 [assoc->sadb_sa_encrypt]; 3469 if (ealg == NULL || !ALG_VALID(ealg)) { 3470 mutex_exit(&ipss->ipsec_alg_lock); 3471 esp1dbg(espstack, ("Couldn't find encr alg #%d.\n", 3472 assoc->sadb_sa_encrypt)); 3473 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EALG; 3474 return (EINVAL); 3475 } 3476 3477 /* 3478 * Sanity check key sizes. If the encryption algorithm is 3479 * SADB_EALG_NULL but the encryption key is NOT 3480 * NULL then complain. 3481 */ 3482 if ((assoc->sadb_sa_encrypt == SADB_EALG_NULL) || 3483 (!ipsec_valid_key_size(ekey->sadb_key_bits, ealg))) { 3484 mutex_exit(&ipss->ipsec_alg_lock); 3485 *diagnostic = SADB_X_DIAGNOSTIC_BAD_EKEYBITS; 3486 return (EINVAL); 3487 } 3488 ASSERT(ealg->alg_mech_type != CRYPTO_MECHANISM_INVALID); 3489 3490 /* check key */ 3491 if (ipsec_check_key(ealg->alg_mech_type, ekey, B_FALSE, 3492 diagnostic) != 0) { 3493 mutex_exit(&ipss->ipsec_alg_lock); 3494 return (EINVAL); 3495 } 3496 } 3497 mutex_exit(&ipss->ipsec_alg_lock); 3498 3499 return (esp_add_sa_finish(mp, (sadb_msg_t *)mp->b_cont->b_rptr, ksi, 3500 diagnostic, espstack)); 3501 } 3502 3503 /* 3504 * Update a security association. Updates come in two varieties. The first 3505 * is an update of lifetimes on a non-larval SA. The second is an update of 3506 * a larval SA, which ends up looking a lot more like an add. 3507 */ 3508 static int 3509 esp_update_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, 3510 ipsecesp_stack_t *espstack, uint8_t sadb_msg_type) 3511 { 3512 sadb_address_t *dstext = 3513 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3514 3515 if (dstext == NULL) { 3516 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_DST; 3517 return (EINVAL); 3518 } 3519 3520 return (sadb_update_sa(mp, ksi, &espstack->esp_sadb, 3521 diagnostic, espstack->esp_pfkey_q, 3522 esp_add_sa, espstack->ipsecesp_netstack, sadb_msg_type)); 3523 } 3524 3525 /* 3526 * Delete a security association. This is REALLY likely to be code common to 3527 * both AH and ESP. Find the association, then unlink it. 3528 */ 3529 static int 3530 esp_del_sa(mblk_t *mp, keysock_in_t *ksi, int *diagnostic, 3531 ipsecesp_stack_t *espstack, uint8_t sadb_msg_type) 3532 { 3533 sadb_sa_t *assoc = (sadb_sa_t *)ksi->ks_in_extv[SADB_EXT_SA]; 3534 sadb_address_t *dstext = 3535 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_DST]; 3536 sadb_address_t *srcext = 3537 (sadb_address_t *)ksi->ks_in_extv[SADB_EXT_ADDRESS_SRC]; 3538 struct sockaddr_in *sin; 3539 3540 if (assoc == NULL) { 3541 if (dstext != NULL) { 3542 sin = (struct sockaddr_in *)(dstext + 1); 3543 } else if (srcext != NULL) { 3544 sin = (struct sockaddr_in *)(srcext + 1); 3545 } else { 3546 *diagnostic = SADB_X_DIAGNOSTIC_MISSING_SA; 3547 return (EINVAL); 3548 } 3549 return (sadb_purge_sa(mp, ksi, 3550 (sin->sin_family == AF_INET6) ? &espstack->esp_sadb.s_v6 : 3551 &espstack->esp_sadb.s_v4, espstack->esp_pfkey_q, 3552 espstack->esp_sadb.s_ip_q)); 3553 } 3554 3555 return (sadb_delget_sa(mp, ksi, &espstack->esp_sadb, diagnostic, 3556 espstack->esp_pfkey_q, sadb_msg_type)); 3557 } 3558 3559 /* 3560 * Convert the entire contents of all of ESP's SA tables into PF_KEY SADB_DUMP 3561 * messages. 3562 */ 3563 static void 3564 esp_dump(mblk_t *mp, keysock_in_t *ksi, ipsecesp_stack_t *espstack) 3565 { 3566 int error; 3567 sadb_msg_t *samsg; 3568 3569 /* 3570 * Dump each fanout, bailing if error is non-zero. 3571 */ 3572 3573 error = sadb_dump(espstack->esp_pfkey_q, mp, ksi->ks_in_serial, 3574 &espstack->esp_sadb.s_v4); 3575 if (error != 0) 3576 goto bail; 3577 3578 error = sadb_dump(espstack->esp_pfkey_q, mp, ksi->ks_in_serial, 3579 &espstack->esp_sadb.s_v6); 3580 bail: 3581 ASSERT(mp->b_cont != NULL); 3582 samsg = (sadb_msg_t *)mp->b_cont->b_rptr; 3583 samsg->sadb_msg_errno = (uint8_t)error; 3584 sadb_pfkey_echo(espstack->esp_pfkey_q, mp, 3585 (sadb_msg_t *)mp->b_cont->b_rptr, ksi, NULL); 3586 } 3587 3588 /* 3589 * First-cut reality check for an inbound PF_KEY message. 3590 */ 3591 static boolean_t 3592 esp_pfkey_reality_failures(mblk_t *mp, keysock_in_t *ksi, 3593 ipsecesp_stack_t *espstack) 3594 { 3595 int diagnostic; 3596 3597 if (ksi->ks_in_extv[SADB_EXT_PROPOSAL] != NULL) { 3598 diagnostic = SADB_X_DIAGNOSTIC_PROP_PRESENT; 3599 goto badmsg; 3600 } 3601 if (ksi->ks_in_extv[SADB_EXT_SUPPORTED_AUTH] != NULL || 3602 ksi->ks_in_extv[SADB_EXT_SUPPORTED_ENCRYPT] != NULL) { 3603 diagnostic = SADB_X_DIAGNOSTIC_SUPP_PRESENT; 3604 goto badmsg; 3605 } 3606 return (B_FALSE); /* False ==> no failures */ 3607 3608 badmsg: 3609 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EINVAL, diagnostic, 3610 ksi->ks_in_serial); 3611 return (B_TRUE); /* True ==> failures */ 3612 } 3613 3614 /* 3615 * ESP parsing of PF_KEY messages. Keysock did most of the really silly 3616 * error cases. What I receive is a fully-formed, syntactically legal 3617 * PF_KEY message. I then need to check semantics... 3618 * 3619 * This code may become common to AH and ESP. Stay tuned. 3620 * 3621 * I also make the assumption that db_ref's are cool. If this assumption 3622 * is wrong, this means that someone other than keysock or me has been 3623 * mucking with PF_KEY messages. 3624 */ 3625 static void 3626 esp_parse_pfkey(mblk_t *mp, ipsecesp_stack_t *espstack) 3627 { 3628 mblk_t *msg = mp->b_cont; 3629 sadb_msg_t *samsg; 3630 keysock_in_t *ksi; 3631 int error; 3632 int diagnostic = SADB_X_DIAGNOSTIC_NONE; 3633 3634 ASSERT(msg != NULL); 3635 3636 samsg = (sadb_msg_t *)msg->b_rptr; 3637 ksi = (keysock_in_t *)mp->b_rptr; 3638 3639 /* 3640 * If applicable, convert unspecified AF_INET6 to unspecified 3641 * AF_INET. And do other address reality checks. 3642 */ 3643 if (!sadb_addrfix(ksi, espstack->esp_pfkey_q, mp, 3644 espstack->ipsecesp_netstack) || 3645 esp_pfkey_reality_failures(mp, ksi, espstack)) { 3646 return; 3647 } 3648 3649 switch (samsg->sadb_msg_type) { 3650 case SADB_ADD: 3651 error = esp_add_sa(mp, ksi, &diagnostic, 3652 espstack->ipsecesp_netstack); 3653 if (error != 0) { 3654 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3655 diagnostic, ksi->ks_in_serial); 3656 } 3657 /* else esp_add_sa() took care of things. */ 3658 break; 3659 case SADB_DELETE: 3660 case SADB_X_DELPAIR: 3661 error = esp_del_sa(mp, ksi, &diagnostic, espstack, 3662 samsg->sadb_msg_type); 3663 if (error != 0) { 3664 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3665 diagnostic, ksi->ks_in_serial); 3666 } 3667 /* Else esp_del_sa() took care of things. */ 3668 break; 3669 case SADB_GET: 3670 error = sadb_delget_sa(mp, ksi, &espstack->esp_sadb, 3671 &diagnostic, espstack->esp_pfkey_q, samsg->sadb_msg_type); 3672 if (error != 0) { 3673 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3674 diagnostic, ksi->ks_in_serial); 3675 } 3676 /* Else sadb_get_sa() took care of things. */ 3677 break; 3678 case SADB_FLUSH: 3679 sadbp_flush(&espstack->esp_sadb, espstack->ipsecesp_netstack); 3680 sadb_pfkey_echo(espstack->esp_pfkey_q, mp, samsg, ksi, NULL); 3681 break; 3682 case SADB_REGISTER: 3683 /* 3684 * Hmmm, let's do it! Check for extensions (there should 3685 * be none), extract the fields, call esp_register_out(), 3686 * then either free or report an error. 3687 * 3688 * Keysock takes care of the PF_KEY bookkeeping for this. 3689 */ 3690 if (esp_register_out(samsg->sadb_msg_seq, samsg->sadb_msg_pid, 3691 ksi->ks_in_serial, espstack)) { 3692 freemsg(mp); 3693 } else { 3694 /* 3695 * Only way this path hits is if there is a memory 3696 * failure. It will not return B_FALSE because of 3697 * lack of esp_pfkey_q if I am in wput(). 3698 */ 3699 sadb_pfkey_error(espstack->esp_pfkey_q, mp, ENOMEM, 3700 diagnostic, ksi->ks_in_serial); 3701 } 3702 break; 3703 case SADB_UPDATE: 3704 case SADB_X_UPDATEPAIR: 3705 /* 3706 * Find a larval, if not there, find a full one and get 3707 * strict. 3708 */ 3709 error = esp_update_sa(mp, ksi, &diagnostic, espstack, 3710 samsg->sadb_msg_type); 3711 if (error != 0) { 3712 sadb_pfkey_error(espstack->esp_pfkey_q, mp, error, 3713 diagnostic, ksi->ks_in_serial); 3714 } 3715 /* else esp_update_sa() took care of things. */ 3716 break; 3717 case SADB_GETSPI: 3718 /* 3719 * Reserve a new larval entry. 3720 */ 3721 esp_getspi(mp, ksi, espstack); 3722 break; 3723 case SADB_ACQUIRE: 3724 /* 3725 * Find larval and/or ACQUIRE record and kill it (them), I'm 3726 * most likely an error. Inbound ACQUIRE messages should only 3727 * have the base header. 3728 */ 3729 sadb_in_acquire(samsg, &espstack->esp_sadb, 3730 espstack->esp_pfkey_q, espstack->ipsecesp_netstack); 3731 freemsg(mp); 3732 break; 3733 case SADB_DUMP: 3734 /* 3735 * Dump all entries. 3736 */ 3737 esp_dump(mp, ksi, espstack); 3738 /* esp_dump will take care of the return message, etc. */ 3739 break; 3740 case SADB_EXPIRE: 3741 /* Should never reach me. */ 3742 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EOPNOTSUPP, 3743 diagnostic, ksi->ks_in_serial); 3744 break; 3745 default: 3746 sadb_pfkey_error(espstack->esp_pfkey_q, mp, EINVAL, 3747 SADB_X_DIAGNOSTIC_UNKNOWN_MSG, ksi->ks_in_serial); 3748 break; 3749 } 3750 } 3751 3752 /* 3753 * Handle case where PF_KEY says it can't find a keysock for one of my 3754 * ACQUIRE messages. 3755 */ 3756 static void 3757 esp_keysock_no_socket(mblk_t *mp, ipsecesp_stack_t *espstack) 3758 { 3759 sadb_msg_t *samsg; 3760 keysock_out_err_t *kse = (keysock_out_err_t *)mp->b_rptr; 3761 3762 if (mp->b_cont == NULL) { 3763 freemsg(mp); 3764 return; 3765 } 3766 samsg = (sadb_msg_t *)mp->b_cont->b_rptr; 3767 3768 /* 3769 * If keysock can't find any registered, delete the acquire record 3770 * immediately, and handle errors. 3771 */ 3772 if (samsg->sadb_msg_type == SADB_ACQUIRE) { 3773 samsg->sadb_msg_errno = kse->ks_err_errno; 3774 samsg->sadb_msg_len = SADB_8TO64(sizeof (*samsg)); 3775 /* 3776 * Use the write-side of the esp_pfkey_q, in case there is 3777 * no esp_sadb.s_ip_q. 3778 */ 3779 sadb_in_acquire(samsg, &espstack->esp_sadb, 3780 WR(espstack->esp_pfkey_q), espstack->ipsecesp_netstack); 3781 } 3782 3783 freemsg(mp); 3784 } 3785 3786 /* 3787 * ESP module write put routine. 3788 */ 3789 static void 3790 ipsecesp_wput(queue_t *q, mblk_t *mp) 3791 { 3792 ipsec_info_t *ii; 3793 struct iocblk *iocp; 3794 ipsecesp_stack_t *espstack = (ipsecesp_stack_t *)q->q_ptr; 3795 3796 esp3dbg(espstack, ("In esp_wput().\n")); 3797 3798 /* NOTE: Each case must take care of freeing or passing mp. */ 3799 switch (mp->b_datap->db_type) { 3800 case M_CTL: 3801 if ((mp->b_wptr - mp->b_rptr) < sizeof (ipsec_info_t)) { 3802 /* Not big enough message. */ 3803 freemsg(mp); 3804 break; 3805 } 3806 ii = (ipsec_info_t *)mp->b_rptr; 3807 3808 switch (ii->ipsec_info_type) { 3809 case KEYSOCK_OUT_ERR: 3810 esp1dbg(espstack, ("Got KEYSOCK_OUT_ERR message.\n")); 3811 esp_keysock_no_socket(mp, espstack); 3812 break; 3813 case KEYSOCK_IN: 3814 ESP_BUMP_STAT(espstack, keysock_in); 3815 esp3dbg(espstack, ("Got KEYSOCK_IN message.\n")); 3816 3817 /* Parse the message. */ 3818 esp_parse_pfkey(mp, espstack); 3819 break; 3820 case KEYSOCK_HELLO: 3821 sadb_keysock_hello(&espstack->esp_pfkey_q, q, mp, 3822 esp_ager, (void *)espstack, &espstack->esp_event, 3823 SADB_SATYPE_ESP); 3824 break; 3825 default: 3826 esp2dbg(espstack, ("Got M_CTL from above of 0x%x.\n", 3827 ii->ipsec_info_type)); 3828 freemsg(mp); 3829 break; 3830 } 3831 break; 3832 case M_IOCTL: 3833 iocp = (struct iocblk *)mp->b_rptr; 3834 switch (iocp->ioc_cmd) { 3835 case ND_SET: 3836 case ND_GET: 3837 if (nd_getset(q, espstack->ipsecesp_g_nd, mp)) { 3838 qreply(q, mp); 3839 return; 3840 } else { 3841 iocp->ioc_error = ENOENT; 3842 } 3843 /* FALLTHRU */ 3844 default: 3845 /* We really don't support any other ioctls, do we? */ 3846 3847 /* Return EINVAL */ 3848 if (iocp->ioc_error != ENOENT) 3849 iocp->ioc_error = EINVAL; 3850 iocp->ioc_count = 0; 3851 mp->b_datap->db_type = M_IOCACK; 3852 qreply(q, mp); 3853 return; 3854 } 3855 default: 3856 esp3dbg(espstack, 3857 ("Got default message, type %d, passing to IP.\n", 3858 mp->b_datap->db_type)); 3859 putnext(q, mp); 3860 } 3861 } 3862 3863 /* 3864 * Process an outbound ESP packet that can be accelerated by a IPsec 3865 * hardware acceleration capable Provider. 3866 * The caller already inserted and initialized the ESP header. 3867 * This function allocates a tagging M_CTL, and adds room at the end 3868 * of the packet to hold the ICV if authentication is needed. 3869 * 3870 * On success returns B_TRUE, on failure returns B_FALSE and frees the 3871 * mblk chain ipsec_out. 3872 */ 3873 static ipsec_status_t 3874 esp_outbound_accelerated(mblk_t *ipsec_out, uint_t icv_len) 3875 { 3876 ipsec_out_t *io; 3877 mblk_t *lastmp; 3878 netstack_t *ns; 3879 ipsecesp_stack_t *espstack; 3880 ipsec_stack_t *ipss; 3881 3882 io = (ipsec_out_t *)ipsec_out->b_rptr; 3883 ns = io->ipsec_out_ns; 3884 espstack = ns->netstack_ipsecesp; 3885 ipss = ns->netstack_ipsec; 3886 3887 ESP_BUMP_STAT(espstack, out_accelerated); 3888 3889 /* mark packet as being accelerated in IPSEC_OUT */ 3890 ASSERT(io->ipsec_out_accelerated == B_FALSE); 3891 io->ipsec_out_accelerated = B_TRUE; 3892 3893 /* 3894 * add room at the end of the packet for the ICV if needed 3895 */ 3896 if (icv_len > 0) { 3897 /* go to last mblk */ 3898 lastmp = ipsec_out; /* For following while loop. */ 3899 do { 3900 lastmp = lastmp->b_cont; 3901 } while (lastmp->b_cont != NULL); 3902 3903 /* if not enough available room, allocate new mblk */ 3904 if ((lastmp->b_wptr + icv_len) > lastmp->b_datap->db_lim) { 3905 lastmp->b_cont = allocb(icv_len, BPRI_HI); 3906 if (lastmp->b_cont == NULL) { 3907 ESP_BUMP_STAT(espstack, out_discards); 3908 ip_drop_packet(ipsec_out, B_FALSE, NULL, NULL, 3909 DROPPER(ipss, ipds_esp_nomem), 3910 &espstack->esp_dropper); 3911 return (IPSEC_STATUS_FAILED); 3912 } 3913 lastmp = lastmp->b_cont; 3914 } 3915 lastmp->b_wptr += icv_len; 3916 } 3917 3918 return (IPSEC_STATUS_SUCCESS); 3919 } 3920 3921 /* 3922 * Process an inbound accelerated ESP packet. 3923 * On success returns B_TRUE, on failure returns B_FALSE and frees the 3924 * mblk chain ipsec_in. 3925 */ 3926 static ipsec_status_t 3927 esp_inbound_accelerated(mblk_t *ipsec_in, mblk_t *data_mp, boolean_t isv4, 3928 ipsa_t *assoc) 3929 { 3930 ipsec_in_t *ii = (ipsec_in_t *)ipsec_in->b_rptr; 3931 mblk_t *hada_mp; 3932 uint32_t icv_len = 0; 3933 da_ipsec_t *hada; 3934 ipha_t *ipha; 3935 ip6_t *ip6h; 3936 kstat_named_t *counter; 3937 netstack_t *ns = ii->ipsec_in_ns; 3938 ipsecesp_stack_t *espstack = ns->netstack_ipsecesp; 3939 ipsec_stack_t *ipss = ns->netstack_ipsec; 3940 3941 ESP_BUMP_STAT(espstack, in_accelerated); 3942 3943 hada_mp = ii->ipsec_in_da; 3944 ASSERT(hada_mp != NULL); 3945 hada = (da_ipsec_t *)hada_mp->b_rptr; 3946 3947 /* 3948 * We only support one level of decapsulation in hardware, so 3949 * nuke the pointer. 3950 */ 3951 ii->ipsec_in_da = NULL; 3952 ii->ipsec_in_accelerated = B_FALSE; 3953 3954 if (assoc->ipsa_auth_alg != IPSA_AALG_NONE) { 3955 /* 3956 * ESP with authentication. We expect the Provider to have 3957 * computed the ICV and placed it in the hardware acceleration 3958 * data attributes. 3959 * 3960 * Extract ICV length from attributes M_CTL and sanity check 3961 * its value. We allow the mblk to be smaller than da_ipsec_t 3962 * for a small ICV, as long as the entire ICV fits within the 3963 * mblk. 3964 * 3965 * Also ensures that the ICV length computed by Provider 3966 * corresponds to the ICV length of the agorithm specified by 3967 * the SA. 3968 */ 3969 icv_len = hada->da_icv_len; 3970 if ((icv_len != assoc->ipsa_mac_len) || 3971 (icv_len > DA_ICV_MAX_LEN) || (MBLKL(hada_mp) < 3972 (sizeof (da_ipsec_t) - DA_ICV_MAX_LEN + icv_len))) { 3973 esp0dbg(("esp_inbound_accelerated: " 3974 "ICV len (%u) incorrect or mblk too small (%u)\n", 3975 icv_len, (uint32_t)(MBLKL(hada_mp)))); 3976 counter = DROPPER(ipss, ipds_esp_bad_auth); 3977 goto esp_in_discard; 3978 } 3979 } 3980 3981 /* get pointers to IP header */ 3982 if (isv4) { 3983 ipha = (ipha_t *)data_mp->b_rptr; 3984 } else { 3985 ip6h = (ip6_t *)data_mp->b_rptr; 3986 } 3987 3988 /* 3989 * Compare ICV in ESP packet vs ICV computed by adapter. 3990 * We also remove the ICV from the end of the packet since 3991 * it will no longer be needed. 3992 * 3993 * Assume that esp_inbound() already ensured that the pkt 3994 * was in one mblk. 3995 */ 3996 ASSERT(data_mp->b_cont == NULL); 3997 data_mp->b_wptr -= icv_len; 3998 /* adjust IP header */ 3999 if (isv4) 4000 ipha->ipha_length = htons(ntohs(ipha->ipha_length) - icv_len); 4001 else 4002 ip6h->ip6_plen = htons(ntohs(ip6h->ip6_plen) - icv_len); 4003 if (icv_len && bcmp(hada->da_icv, data_mp->b_wptr, icv_len)) { 4004 int af; 4005 void *addr; 4006 4007 if (isv4) { 4008 addr = &ipha->ipha_dst; 4009 af = AF_INET; 4010 } else { 4011 addr = &ip6h->ip6_dst; 4012 af = AF_INET6; 4013 } 4014 4015 /* 4016 * Log the event. Don't print to the console, block 4017 * potential denial-of-service attack. 4018 */ 4019 ESP_BUMP_STAT(espstack, bad_auth); 4020 ipsec_assocfailure(info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 4021 "ESP Authentication failed spi %x, dst_addr %s", 4022 assoc->ipsa_spi, addr, af, espstack->ipsecesp_netstack); 4023 counter = DROPPER(ipss, ipds_esp_bad_auth); 4024 goto esp_in_discard; 4025 } 4026 4027 esp3dbg(espstack, ("esp_inbound_accelerated: ESP authentication " 4028 "succeeded, checking replay\n")); 4029 4030 ipsec_in->b_cont = data_mp; 4031 4032 /* 4033 * Remove ESP header and padding from packet. 4034 */ 4035 if (!esp_strip_header(data_mp, ii->ipsec_in_v4, assoc->ipsa_iv_len, 4036 &counter, espstack)) { 4037 esp1dbg(espstack, ("esp_inbound_accelerated: " 4038 "esp_strip_header() failed\n")); 4039 goto esp_in_discard; 4040 } 4041 4042 freeb(hada_mp); 4043 4044 /* 4045 * Account for usage.. 4046 */ 4047 if (!esp_age_bytes(assoc, msgdsize(data_mp), B_TRUE)) { 4048 /* The ipsa has hit hard expiration, LOG and AUDIT. */ 4049 ESP_BUMP_STAT(espstack, bytes_expired); 4050 IP_ESP_BUMP_STAT(ipss, in_discards); 4051 ipsec_assocfailure(info.mi_idnum, 0, 0, SL_ERROR | SL_WARN, 4052 "ESP association 0x%x, dst %s had bytes expire.\n", 4053 assoc->ipsa_spi, assoc->ipsa_dstaddr, assoc->ipsa_addrfam, 4054 espstack->ipsecesp_netstack); 4055 ip_drop_packet(ipsec_in, B_TRUE, NULL, NULL, 4056 DROPPER(ipss, ipds_esp_bytes_expire), 4057 &espstack->esp_dropper); 4058 return (IPSEC_STATUS_FAILED); 4059 } 4060 4061 /* done processing the packet */ 4062 return (IPSEC_STATUS_SUCCESS); 4063 4064 esp_in_discard: 4065 IP_ESP_BUMP_STAT(ipss, in_discards); 4066 freeb(hada_mp); 4067 4068 ipsec_in->b_cont = data_mp; /* For ip_drop_packet()'s sake... */ 4069 ip_drop_packet(ipsec_in, B_TRUE, NULL, NULL, counter, 4070 &espstack->esp_dropper); 4071 4072 return (IPSEC_STATUS_FAILED); 4073 } 4074 4075 /* 4076 * Wrapper to allow IP to trigger an ESP association failure message 4077 * during inbound SA selection. 4078 */ 4079 void 4080 ipsecesp_in_assocfailure(mblk_t *mp, char level, ushort_t sl, char *fmt, 4081 uint32_t spi, void *addr, int af, ipsecesp_stack_t *espstack) 4082 { 4083 ipsec_stack_t *ipss = espstack->ipsecesp_netstack->netstack_ipsec; 4084 4085 if (espstack->ipsecesp_log_unknown_spi) { 4086 ipsec_assocfailure(info.mi_idnum, 0, level, sl, fmt, spi, 4087 addr, af, espstack->ipsecesp_netstack); 4088 } 4089 4090 ip_drop_packet(mp, B_TRUE, NULL, NULL, 4091 DROPPER(ipss, ipds_esp_no_sa), 4092 &espstack->esp_dropper); 4093 } 4094 4095 /* 4096 * Initialize the ESP input and output processing functions. 4097 */ 4098 void 4099 ipsecesp_init_funcs(ipsa_t *sa) 4100 { 4101 if (sa->ipsa_output_func == NULL) 4102 sa->ipsa_output_func = esp_outbound; 4103 if (sa->ipsa_input_func == NULL) 4104 sa->ipsa_input_func = esp_inbound; 4105 } 4106