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 /* 23 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 24 */ 25 26 #include <sys/types.h> 27 #include <sys/systm.h> 28 #include <sys/stream.h> 29 #include <sys/cmn_err.h> 30 #include <sys/kmem.h> 31 #define _SUN_TPI_VERSION 2 32 #include <sys/tihdr.h> 33 #include <sys/stropts.h> 34 #include <sys/socket.h> 35 #include <sys/random.h> 36 #include <sys/policy.h> 37 #include <sys/tsol/tndb.h> 38 #include <sys/tsol/tnet.h> 39 40 #include <netinet/in.h> 41 #include <netinet/ip6.h> 42 43 #include <inet/common.h> 44 #include <inet/ip.h> 45 #include <inet/ip6.h> 46 #include <inet/ipclassifier.h> 47 #include "sctp_impl.h" 48 #include "sctp_asconf.h" 49 #include "sctp_addr.h" 50 51 /* 52 * Minimum number of associations which can be created per listener. Used 53 * when the listener association count is in effect. 54 */ 55 static uint32_t sctp_min_assoc_listener = 2; 56 57 /* 58 * Returns 0 on success, EACCES on permission failure. 59 */ 60 static int 61 sctp_select_port(sctp_t *sctp, in_port_t *requested_port, int *user_specified) 62 { 63 sctp_stack_t *sctps = sctp->sctp_sctps; 64 conn_t *connp = sctp->sctp_connp; 65 66 /* 67 * Get a valid port (within the anonymous range and should not 68 * be a privileged one) to use if the user has not given a port. 69 * If multiple threads are here, they may all start with 70 * with the same initial port. But, it should be fine as long as 71 * sctp_bindi will ensure that no two threads will be assigned 72 * the same port. 73 */ 74 if (*requested_port == 0) { 75 *requested_port = sctp_update_next_port( 76 sctps->sctps_next_port_to_try, 77 crgetzone(connp->conn_cred), sctps); 78 if (*requested_port == 0) 79 return (EACCES); 80 *user_specified = 0; 81 } else { 82 int i; 83 boolean_t priv = B_FALSE; 84 85 /* 86 * If the requested_port is in the well-known privileged range, 87 * verify that the stream was opened by a privileged user. 88 * Note: No locks are held when inspecting sctp_g_*epriv_ports 89 * but instead the code relies on: 90 * - the fact that the address of the array and its size never 91 * changes 92 * - the atomic assignment of the elements of the array 93 */ 94 if (*requested_port < sctps->sctps_smallest_nonpriv_port) { 95 priv = B_TRUE; 96 } else { 97 for (i = 0; i < sctps->sctps_g_num_epriv_ports; i++) { 98 if (*requested_port == 99 sctps->sctps_g_epriv_ports[i]) { 100 priv = B_TRUE; 101 break; 102 } 103 } 104 } 105 if (priv) { 106 /* 107 * sctp_bind() should take a cred_t argument so that 108 * we can use it here. 109 */ 110 if (secpolicy_net_privaddr(connp->conn_cred, 111 *requested_port, IPPROTO_SCTP) != 0) { 112 dprint(1, 113 ("sctp_bind(x): no prive for port %d", 114 *requested_port)); 115 return (EACCES); 116 } 117 } 118 *user_specified = 1; 119 } 120 121 return (0); 122 } 123 124 int 125 sctp_listen(sctp_t *sctp) 126 { 127 sctp_tf_t *tf; 128 sctp_stack_t *sctps = sctp->sctp_sctps; 129 conn_t *connp = sctp->sctp_connp; 130 131 RUN_SCTP(sctp); 132 /* 133 * TCP handles listen() increasing the backlog, need to check 134 * if it should be handled here too 135 */ 136 if (sctp->sctp_state > SCTPS_BOUND || 137 (sctp->sctp_connp->conn_state_flags & CONN_CLOSING)) { 138 WAKE_SCTP(sctp); 139 return (EINVAL); 140 } 141 142 /* Do an anonymous bind for unbound socket doing listen(). */ 143 if (sctp->sctp_nsaddrs == 0) { 144 struct sockaddr_storage ss; 145 int ret; 146 147 bzero(&ss, sizeof (ss)); 148 ss.ss_family = connp->conn_family; 149 150 WAKE_SCTP(sctp); 151 if ((ret = sctp_bind(sctp, (struct sockaddr *)&ss, 152 sizeof (ss))) != 0) 153 return (ret); 154 RUN_SCTP(sctp) 155 } 156 157 /* Cache things in the ixa without any refhold */ 158 ASSERT(!(connp->conn_ixa->ixa_free_flags & IXA_FREE_CRED)); 159 connp->conn_ixa->ixa_cred = connp->conn_cred; 160 connp->conn_ixa->ixa_cpid = connp->conn_cpid; 161 if (is_system_labeled()) 162 connp->conn_ixa->ixa_tsl = crgetlabel(connp->conn_cred); 163 164 sctp->sctp_state = SCTPS_LISTEN; 165 (void) random_get_pseudo_bytes(sctp->sctp_secret, SCTP_SECRET_LEN); 166 sctp->sctp_last_secret_update = ddi_get_lbolt64(); 167 bzero(sctp->sctp_old_secret, SCTP_SECRET_LEN); 168 169 /* 170 * If there is an association limit, allocate and initialize 171 * the counter struct. Note that since listen can be called 172 * multiple times, the struct may have been allready allocated. 173 */ 174 if (!list_is_empty(&sctps->sctps_listener_conf) && 175 sctp->sctp_listen_cnt == NULL) { 176 sctp_listen_cnt_t *slc; 177 uint32_t ratio; 178 179 ratio = sctp_find_listener_conf(sctps, 180 ntohs(connp->conn_lport)); 181 if (ratio != 0) { 182 uint32_t mem_ratio, tot_buf; 183 184 slc = kmem_alloc(sizeof (sctp_listen_cnt_t), KM_SLEEP); 185 /* 186 * Calculate the connection limit based on 187 * the configured ratio and maxusers. Maxusers 188 * are calculated based on memory size, 189 * ~ 1 user per MB. Note that the conn_rcvbuf 190 * and conn_sndbuf may change after a 191 * connection is accepted. So what we have 192 * is only an approximation. 193 */ 194 if ((tot_buf = connp->conn_rcvbuf + 195 connp->conn_sndbuf) < MB) { 196 mem_ratio = MB / tot_buf; 197 slc->slc_max = maxusers / ratio * mem_ratio; 198 } else { 199 mem_ratio = tot_buf / MB; 200 slc->slc_max = maxusers / ratio / mem_ratio; 201 } 202 /* At least we should allow some associations! */ 203 if (slc->slc_max < sctp_min_assoc_listener) 204 slc->slc_max = sctp_min_assoc_listener; 205 slc->slc_cnt = 1; 206 slc->slc_drop = 0; 207 sctp->sctp_listen_cnt = slc; 208 } 209 } 210 211 212 tf = &sctps->sctps_listen_fanout[SCTP_LISTEN_HASH( 213 ntohs(connp->conn_lport))]; 214 sctp_listen_hash_insert(tf, sctp); 215 216 WAKE_SCTP(sctp); 217 return (0); 218 } 219 220 /* 221 * Bind the sctp_t to a sockaddr, which includes an address and other 222 * information, such as port or flowinfo. 223 */ 224 int 225 sctp_bind(sctp_t *sctp, struct sockaddr *sa, socklen_t len) 226 { 227 int user_specified; 228 boolean_t bind_to_req_port_only; 229 in_port_t requested_port; 230 in_port_t allocated_port; 231 int err = 0; 232 conn_t *connp = sctp->sctp_connp; 233 uint_t scope_id; 234 sin_t *sin; 235 sin6_t *sin6; 236 237 ASSERT(sctp != NULL); 238 239 RUN_SCTP(sctp); 240 241 if ((sctp->sctp_state >= SCTPS_BOUND) || 242 (sctp->sctp_connp->conn_state_flags & CONN_CLOSING) || 243 (sa == NULL || len == 0)) { 244 /* 245 * Multiple binds not allowed for any SCTP socket 246 * Also binding with null address is not supported. 247 */ 248 err = EINVAL; 249 goto done; 250 } 251 252 switch (sa->sa_family) { 253 case AF_INET: 254 sin = (sin_t *)sa; 255 if (len < sizeof (struct sockaddr_in) || 256 connp->conn_family == AF_INET6) { 257 err = EINVAL; 258 goto done; 259 } 260 requested_port = ntohs(sin->sin_port); 261 break; 262 case AF_INET6: 263 sin6 = (sin6_t *)sa; 264 if (len < sizeof (struct sockaddr_in6) || 265 connp->conn_family == AF_INET) { 266 err = EINVAL; 267 goto done; 268 } 269 requested_port = ntohs(sin6->sin6_port); 270 /* Set the flowinfo. */ 271 connp->conn_flowinfo = 272 sin6->sin6_flowinfo & ~IPV6_VERS_AND_FLOW_MASK; 273 274 scope_id = sin6->sin6_scope_id; 275 if (scope_id != 0 && IN6_IS_ADDR_LINKSCOPE(&sin6->sin6_addr)) { 276 connp->conn_ixa->ixa_flags |= IXAF_SCOPEID_SET; 277 connp->conn_ixa->ixa_scopeid = scope_id; 278 connp->conn_incoming_ifindex = scope_id; 279 } else { 280 connp->conn_ixa->ixa_flags &= ~IXAF_SCOPEID_SET; 281 connp->conn_incoming_ifindex = connp->conn_bound_if; 282 } 283 break; 284 default: 285 err = EAFNOSUPPORT; 286 goto done; 287 } 288 bind_to_req_port_only = requested_port == 0 ? B_FALSE : B_TRUE; 289 290 err = sctp_select_port(sctp, &requested_port, &user_specified); 291 if (err != 0) 292 goto done; 293 294 if ((err = sctp_bind_add(sctp, sa, 1, B_TRUE, 295 user_specified == 1 ? htons(requested_port) : 0)) != 0) { 296 goto done; 297 } 298 err = sctp_bindi(sctp, requested_port, bind_to_req_port_only, 299 user_specified, &allocated_port); 300 if (err != 0) { 301 sctp_free_saddrs(sctp); 302 } else { 303 ASSERT(sctp->sctp_state == SCTPS_BOUND); 304 } 305 done: 306 WAKE_SCTP(sctp); 307 return (err); 308 } 309 310 /* 311 * Perform bind/unbind operation of a list of addresses on a sctp_t 312 */ 313 int 314 sctp_bindx(sctp_t *sctp, const void *addrs, int addrcnt, int bindop) 315 { 316 ASSERT(sctp != NULL); 317 ASSERT(addrs != NULL); 318 ASSERT(addrcnt > 0); 319 320 switch (bindop) { 321 case SCTP_BINDX_ADD_ADDR: 322 return (sctp_bind_add(sctp, addrs, addrcnt, B_FALSE, 323 sctp->sctp_connp->conn_lport)); 324 case SCTP_BINDX_REM_ADDR: 325 return (sctp_bind_del(sctp, addrs, addrcnt, B_FALSE)); 326 default: 327 return (EINVAL); 328 } 329 } 330 331 /* 332 * Add a list of addresses to a sctp_t. 333 */ 334 int 335 sctp_bind_add(sctp_t *sctp, const void *addrs, uint32_t addrcnt, 336 boolean_t caller_hold_lock, in_port_t port) 337 { 338 int err = 0; 339 boolean_t do_asconf = B_FALSE; 340 sctp_stack_t *sctps = sctp->sctp_sctps; 341 conn_t *connp = sctp->sctp_connp; 342 343 if (!caller_hold_lock) 344 RUN_SCTP(sctp); 345 346 if (sctp->sctp_state > SCTPS_ESTABLISHED || 347 (sctp->sctp_connp->conn_state_flags & CONN_CLOSING)) { 348 if (!caller_hold_lock) 349 WAKE_SCTP(sctp); 350 return (EINVAL); 351 } 352 353 if (sctp->sctp_state > SCTPS_LISTEN) { 354 /* 355 * Let's do some checking here rather than undoing the 356 * add later (for these reasons). 357 */ 358 if (!sctps->sctps_addip_enabled || 359 !sctp->sctp_understands_asconf || 360 !sctp->sctp_understands_addip) { 361 if (!caller_hold_lock) 362 WAKE_SCTP(sctp); 363 return (EINVAL); 364 } 365 do_asconf = B_TRUE; 366 } 367 /* 368 * On a clustered node, for an inaddr_any bind, we will pass the list 369 * of all the addresses in the global list, minus any address on the 370 * loopback interface, and expect the clustering susbsystem to give us 371 * the correct list for the 'port'. For explicit binds we give the 372 * list of addresses and the clustering module validates it for the 373 * 'port'. 374 * 375 * On a non-clustered node, cl_sctp_check_addrs will be NULL and 376 * we proceed as usual. 377 */ 378 if (cl_sctp_check_addrs != NULL) { 379 uchar_t *addrlist = NULL; 380 size_t size = 0; 381 int unspec = 0; 382 boolean_t do_listen; 383 uchar_t *llist = NULL; 384 size_t lsize = 0; 385 386 /* 387 * If we are adding addresses after listening, but before 388 * an association is established, we need to update the 389 * clustering module with this info. 390 */ 391 do_listen = !do_asconf && sctp->sctp_state > SCTPS_BOUND && 392 cl_sctp_listen != NULL; 393 394 err = sctp_get_addrlist(sctp, addrs, &addrcnt, &addrlist, 395 &unspec, &size); 396 if (err != 0) { 397 ASSERT(addrlist == NULL); 398 ASSERT(addrcnt == 0); 399 ASSERT(size == 0); 400 if (!caller_hold_lock) 401 WAKE_SCTP(sctp); 402 SCTP_KSTAT(sctps, sctp_cl_check_addrs); 403 return (err); 404 } 405 ASSERT(addrlist != NULL); 406 (*cl_sctp_check_addrs)(connp->conn_family, port, &addrlist, 407 size, &addrcnt, unspec == 1); 408 if (addrcnt == 0) { 409 /* We free the list */ 410 kmem_free(addrlist, size); 411 if (!caller_hold_lock) 412 WAKE_SCTP(sctp); 413 return (EINVAL); 414 } 415 if (do_listen) { 416 lsize = sizeof (in6_addr_t) * addrcnt; 417 llist = kmem_alloc(lsize, KM_SLEEP); 418 } 419 err = sctp_valid_addr_list(sctp, addrlist, addrcnt, llist, 420 lsize); 421 if (err == 0 && do_listen) { 422 (*cl_sctp_listen)(connp->conn_family, llist, 423 addrcnt, connp->conn_lport); 424 /* list will be freed by the clustering module */ 425 } else if (err != 0 && llist != NULL) { 426 kmem_free(llist, lsize); 427 } 428 /* free the list we allocated */ 429 kmem_free(addrlist, size); 430 } else { 431 err = sctp_valid_addr_list(sctp, addrs, addrcnt, NULL, 0); 432 } 433 if (err != 0) { 434 if (!caller_hold_lock) 435 WAKE_SCTP(sctp); 436 return (err); 437 } 438 /* Need to send ASCONF messages */ 439 if (do_asconf) { 440 err = sctp_add_ip(sctp, addrs, addrcnt); 441 if (err != 0) { 442 sctp_del_saddr_list(sctp, addrs, addrcnt, B_FALSE); 443 if (!caller_hold_lock) 444 WAKE_SCTP(sctp); 445 return (err); 446 } 447 } 448 if (!caller_hold_lock) 449 WAKE_SCTP(sctp); 450 return (0); 451 } 452 453 /* 454 * Remove one or more addresses bound to the sctp_t. 455 */ 456 int 457 sctp_bind_del(sctp_t *sctp, const void *addrs, uint32_t addrcnt, 458 boolean_t caller_hold_lock) 459 { 460 int error = 0; 461 boolean_t do_asconf = B_FALSE; 462 uchar_t *ulist = NULL; 463 size_t usize = 0; 464 sctp_stack_t *sctps = sctp->sctp_sctps; 465 conn_t *connp = sctp->sctp_connp; 466 467 if (!caller_hold_lock) 468 RUN_SCTP(sctp); 469 470 if (sctp->sctp_state > SCTPS_ESTABLISHED || 471 (sctp->sctp_connp->conn_state_flags & CONN_CLOSING)) { 472 if (!caller_hold_lock) 473 WAKE_SCTP(sctp); 474 return (EINVAL); 475 } 476 /* 477 * Fail the remove if we are beyond listen, but can't send this 478 * to the peer. 479 */ 480 if (sctp->sctp_state > SCTPS_LISTEN) { 481 if (!sctps->sctps_addip_enabled || 482 !sctp->sctp_understands_asconf || 483 !sctp->sctp_understands_addip) { 484 if (!caller_hold_lock) 485 WAKE_SCTP(sctp); 486 return (EINVAL); 487 } 488 do_asconf = B_TRUE; 489 } 490 491 /* Can't delete the last address nor all of the addresses */ 492 if (sctp->sctp_nsaddrs == 1 || addrcnt >= sctp->sctp_nsaddrs) { 493 if (!caller_hold_lock) 494 WAKE_SCTP(sctp); 495 return (EINVAL); 496 } 497 498 if (cl_sctp_unlisten != NULL && !do_asconf && 499 sctp->sctp_state > SCTPS_BOUND) { 500 usize = sizeof (in6_addr_t) * addrcnt; 501 ulist = kmem_alloc(usize, KM_SLEEP); 502 } 503 504 error = sctp_del_ip(sctp, addrs, addrcnt, ulist, usize); 505 if (error != 0) { 506 if (ulist != NULL) 507 kmem_free(ulist, usize); 508 if (!caller_hold_lock) 509 WAKE_SCTP(sctp); 510 return (error); 511 } 512 /* ulist will be non-NULL only if cl_sctp_unlisten is non-NULL */ 513 if (ulist != NULL) { 514 ASSERT(cl_sctp_unlisten != NULL); 515 (*cl_sctp_unlisten)(connp->conn_family, ulist, addrcnt, 516 connp->conn_lport); 517 /* ulist will be freed by the clustering module */ 518 } 519 if (!caller_hold_lock) 520 WAKE_SCTP(sctp); 521 return (error); 522 } 523 524 /* 525 * Returns 0 for success, errno value otherwise. 526 * 527 * If the "bind_to_req_port_only" parameter is set and the requested port 528 * number is available, then set allocated_port to it. If not available, 529 * return an error. 530 * 531 * If the "bind_to_req_port_only" parameter is not set and the requested port 532 * number is available, then set allocated_port to it. If not available, 533 * find the first anonymous port we can and set allocated_port to that. If no 534 * anonymous ports are available, return an error. 535 * 536 * In either case, when succeeding, update the sctp_t to record the port number 537 * and insert it in the bind hash table. 538 */ 539 int 540 sctp_bindi(sctp_t *sctp, in_port_t port, boolean_t bind_to_req_port_only, 541 int user_specified, in_port_t *allocated_port) 542 { 543 /* number of times we have run around the loop */ 544 int count = 0; 545 /* maximum number of times to run around the loop */ 546 int loopmax; 547 sctp_stack_t *sctps = sctp->sctp_sctps; 548 conn_t *connp = sctp->sctp_connp; 549 zone_t *zone = crgetzone(connp->conn_cred); 550 zoneid_t zoneid = connp->conn_zoneid; 551 552 /* 553 * Lookup for free addresses is done in a loop and "loopmax" 554 * influences how long we spin in the loop 555 */ 556 if (bind_to_req_port_only) { 557 /* 558 * If the requested port is busy, don't bother to look 559 * for a new one. Setting loop maximum count to 1 has 560 * that effect. 561 */ 562 loopmax = 1; 563 } else { 564 /* 565 * If the requested port is busy, look for a free one 566 * in the anonymous port range. 567 * Set loopmax appropriately so that one does not look 568 * forever in the case all of the anonymous ports are in use. 569 */ 570 loopmax = (sctps->sctps_largest_anon_port - 571 sctps->sctps_smallest_anon_port + 1); 572 } 573 do { 574 uint16_t lport; 575 sctp_tf_t *tbf; 576 sctp_t *lsctp; 577 int addrcmp; 578 579 lport = htons(port); 580 581 /* 582 * Ensure that the sctp_t is not currently in the bind hash. 583 * Hold the lock on the hash bucket to ensure that 584 * the duplicate check plus the insertion is an atomic 585 * operation. 586 * 587 * This function does an inline lookup on the bind hash list 588 * Make sure that we access only members of sctp_t 589 * and that we don't look at sctp_sctp, since we are not 590 * doing a SCTPB_REFHOLD. For more details please see the notes 591 * in sctp_compress() 592 */ 593 sctp_bind_hash_remove(sctp); 594 tbf = &sctps->sctps_bind_fanout[SCTP_BIND_HASH(port)]; 595 mutex_enter(&tbf->tf_lock); 596 for (lsctp = tbf->tf_sctp; lsctp != NULL; 597 lsctp = lsctp->sctp_bind_hash) { 598 conn_t *lconnp = lsctp->sctp_connp; 599 600 if (lport != lconnp->conn_lport || 601 lsctp->sctp_state < SCTPS_BOUND) 602 continue; 603 604 /* 605 * On a labeled system, we must treat bindings to ports 606 * on shared IP addresses by sockets with MAC exemption 607 * privilege as being in all zones, as there's 608 * otherwise no way to identify the right receiver. 609 */ 610 if (lconnp->conn_zoneid != zoneid && 611 lconnp->conn_mac_mode == CONN_MAC_DEFAULT && 612 connp->conn_mac_mode == CONN_MAC_DEFAULT) 613 continue; 614 615 addrcmp = sctp_compare_saddrs(sctp, lsctp); 616 if (addrcmp != SCTP_ADDR_DISJOINT) { 617 if (!connp->conn_reuseaddr) { 618 /* in use */ 619 break; 620 } else if (lsctp->sctp_state == SCTPS_BOUND || 621 lsctp->sctp_state == SCTPS_LISTEN) { 622 /* 623 * socket option SO_REUSEADDR is set 624 * on the binding sctp_t. 625 * 626 * We have found a match of IP source 627 * address and source port, which is 628 * refused regardless of the 629 * SO_REUSEADDR setting, so we break. 630 */ 631 break; 632 } 633 } 634 } 635 if (lsctp != NULL) { 636 /* The port number is busy */ 637 mutex_exit(&tbf->tf_lock); 638 } else { 639 if (is_system_labeled()) { 640 mlp_type_t addrtype, mlptype; 641 uint_t ipversion; 642 643 /* 644 * On a labeled system we must check the type 645 * of the binding requested by the user (either 646 * MLP or SLP on shared and private addresses), 647 * and that the user's requested binding 648 * is permitted. 649 */ 650 if (connp->conn_family == AF_INET) 651 ipversion = IPV4_VERSION; 652 else 653 ipversion = IPV6_VERSION; 654 655 addrtype = tsol_mlp_addr_type( 656 connp->conn_allzones ? ALL_ZONES : 657 zone->zone_id, 658 ipversion, 659 connp->conn_family == AF_INET ? 660 (void *)&sctp->sctp_ipha->ipha_src : 661 (void *)&sctp->sctp_ip6h->ip6_src, 662 sctps->sctps_netstack->netstack_ip); 663 664 /* 665 * tsol_mlp_addr_type returns the possibilities 666 * for the selected address. Since all local 667 * addresses are either private or shared, the 668 * return value mlptSingle means "local address 669 * not valid (interface not present)." 670 */ 671 if (addrtype == mlptSingle) { 672 mutex_exit(&tbf->tf_lock); 673 return (EADDRNOTAVAIL); 674 } 675 mlptype = tsol_mlp_port_type(zone, IPPROTO_SCTP, 676 port, addrtype); 677 if (mlptype != mlptSingle) { 678 if (secpolicy_net_bindmlp(connp-> 679 conn_cred) != 0) { 680 mutex_exit(&tbf->tf_lock); 681 return (EACCES); 682 } 683 /* 684 * If we're binding a shared MLP, then 685 * make sure that this zone is the one 686 * that owns that MLP. Shared MLPs can 687 * be owned by at most one zone. 688 * 689 * No need to handle exclusive-stack 690 * zones since ALL_ZONES only applies 691 * to the shared stack. 692 */ 693 694 if (mlptype == mlptShared && 695 addrtype == mlptShared && 696 connp->conn_zoneid != 697 tsol_mlp_findzone(IPPROTO_SCTP, 698 lport)) { 699 mutex_exit(&tbf->tf_lock); 700 return (EACCES); 701 } 702 connp->conn_mlp_type = mlptype; 703 } 704 } 705 /* 706 * This port is ours. Insert in fanout and mark as 707 * bound to prevent others from getting the port 708 * number. 709 */ 710 sctp->sctp_state = SCTPS_BOUND; 711 connp->conn_lport = lport; 712 713 ASSERT(&sctps->sctps_bind_fanout[ 714 SCTP_BIND_HASH(port)] == tbf); 715 sctp_bind_hash_insert(tbf, sctp, 1); 716 717 mutex_exit(&tbf->tf_lock); 718 719 /* 720 * We don't want sctp_next_port_to_try to "inherit" 721 * a port number supplied by the user in a bind. 722 * 723 * This is the only place where sctp_next_port_to_try 724 * is updated. After the update, it may or may not 725 * be in the valid range. 726 */ 727 if (user_specified == 0) 728 sctps->sctps_next_port_to_try = port + 1; 729 730 *allocated_port = port; 731 732 return (0); 733 } 734 735 if ((count == 0) && (user_specified)) { 736 /* 737 * We may have to return an anonymous port. So 738 * get one to start with. 739 */ 740 port = sctp_update_next_port( 741 sctps->sctps_next_port_to_try, 742 zone, sctps); 743 user_specified = 0; 744 } else { 745 port = sctp_update_next_port(port + 1, zone, sctps); 746 } 747 if (port == 0) 748 break; 749 750 /* 751 * Don't let this loop run forever in the case where 752 * all of the anonymous ports are in use. 753 */ 754 } while (++count < loopmax); 755 756 return (bind_to_req_port_only ? EADDRINUSE : EADDRNOTAVAIL); 757 } 758 759 /* 760 * Don't let port fall into the privileged range. 761 * Since the extra privileged ports can be arbitrary we also 762 * ensure that we exclude those from consideration. 763 * sctp_g_epriv_ports is not sorted thus we loop over it until 764 * there are no changes. 765 * 766 * Note: No locks are held when inspecting sctp_g_*epriv_ports 767 * but instead the code relies on: 768 * - the fact that the address of the array and its size never changes 769 * - the atomic assignment of the elements of the array 770 */ 771 in_port_t 772 sctp_update_next_port(in_port_t port, zone_t *zone, sctp_stack_t *sctps) 773 { 774 int i; 775 boolean_t restart = B_FALSE; 776 777 retry: 778 if (port < sctps->sctps_smallest_anon_port) 779 port = sctps->sctps_smallest_anon_port; 780 781 if (port > sctps->sctps_largest_anon_port) { 782 if (restart) 783 return (0); 784 restart = B_TRUE; 785 port = sctps->sctps_smallest_anon_port; 786 } 787 788 if (port < sctps->sctps_smallest_nonpriv_port) 789 port = sctps->sctps_smallest_nonpriv_port; 790 791 for (i = 0; i < sctps->sctps_g_num_epriv_ports; i++) { 792 if (port == sctps->sctps_g_epriv_ports[i]) { 793 port++; 794 /* 795 * Make sure whether the port is in the 796 * valid range. 797 * 798 * XXX Note that if sctp_g_epriv_ports contains 799 * all the anonymous ports this will be an 800 * infinite loop. 801 */ 802 goto retry; 803 } 804 } 805 806 if (is_system_labeled() && 807 (i = tsol_next_port(zone, port, IPPROTO_SCTP, B_TRUE)) != 0) { 808 port = i; 809 goto retry; 810 } 811 812 return (port); 813 } 814