1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * Copyright (c) 2001 Nokia, Inc. 7 * Copyright (c) 2001 La Monte H.P. Yarroll 8 * 9 * This file is part of the SCTP kernel implementation 10 * 11 * Initialization/cleanup for SCTP protocol support. 12 * 13 * This SCTP implementation is free software; 14 * you can redistribute it and/or modify it under the terms of 15 * the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This SCTP implementation is distributed in the hope that it 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 21 * ************************ 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 23 * See the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with GNU CC; see the file COPYING. If not, write to 27 * the Free Software Foundation, 59 Temple Place - Suite 330, 28 * Boston, MA 02111-1307, USA. 29 * 30 * Please send any bug reports or fixes you make to the 31 * email address(es): 32 * lksctp developers <lksctp-developers@lists.sourceforge.net> 33 * 34 * Or submit a bug report through the following website: 35 * http://www.sf.net/projects/lksctp 36 * 37 * Written or modified by: 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Karl Knutson <karl@athena.chicago.il.us> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Sridhar Samudrala <sri@us.ibm.com> 42 * Daisy Chang <daisyc@us.ibm.com> 43 * Ardelle Fan <ardelle.fan@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #include <linux/module.h> 50 #include <linux/init.h> 51 #include <linux/netdevice.h> 52 #include <linux/inetdevice.h> 53 #include <linux/seq_file.h> 54 #include <linux/bootmem.h> 55 #include <linux/highmem.h> 56 #include <linux/swap.h> 57 #include <net/net_namespace.h> 58 #include <net/protocol.h> 59 #include <net/ip.h> 60 #include <net/ipv6.h> 61 #include <net/route.h> 62 #include <net/sctp/sctp.h> 63 #include <net/addrconf.h> 64 #include <net/inet_common.h> 65 #include <net/inet_ecn.h> 66 67 /* Global data structures. */ 68 struct sctp_globals sctp_globals __read_mostly; 69 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 70 71 #ifdef CONFIG_PROC_FS 72 struct proc_dir_entry *proc_net_sctp; 73 #endif 74 75 struct idr sctp_assocs_id; 76 DEFINE_SPINLOCK(sctp_assocs_id_lock); 77 78 /* This is the global socket data structure used for responding to 79 * the Out-of-the-blue (OOTB) packets. A control sock will be created 80 * for this socket at the initialization time. 81 */ 82 static struct sock *sctp_ctl_sock; 83 84 static struct sctp_pf *sctp_pf_inet6_specific; 85 static struct sctp_pf *sctp_pf_inet_specific; 86 static struct sctp_af *sctp_af_v4_specific; 87 static struct sctp_af *sctp_af_v6_specific; 88 89 struct kmem_cache *sctp_chunk_cachep __read_mostly; 90 struct kmem_cache *sctp_bucket_cachep __read_mostly; 91 92 int sysctl_sctp_mem[3]; 93 int sysctl_sctp_rmem[3]; 94 int sysctl_sctp_wmem[3]; 95 96 /* Return the address of the control sock. */ 97 struct sock *sctp_get_ctl_sock(void) 98 { 99 return sctp_ctl_sock; 100 } 101 102 /* Set up the proc fs entry for the SCTP protocol. */ 103 static __init int sctp_proc_init(void) 104 { 105 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 106 goto out_nomem; 107 #ifdef CONFIG_PROC_FS 108 if (!proc_net_sctp) { 109 struct proc_dir_entry *ent; 110 ent = proc_mkdir("sctp", init_net.proc_net); 111 if (ent) { 112 ent->owner = THIS_MODULE; 113 proc_net_sctp = ent; 114 } else 115 goto out_free_percpu; 116 } 117 118 if (sctp_snmp_proc_init()) 119 goto out_snmp_proc_init; 120 if (sctp_eps_proc_init()) 121 goto out_eps_proc_init; 122 if (sctp_assocs_proc_init()) 123 goto out_assocs_proc_init; 124 if (sctp_remaddr_proc_init()) 125 goto out_remaddr_proc_init; 126 127 return 0; 128 129 out_remaddr_proc_init: 130 sctp_assocs_proc_exit(); 131 out_assocs_proc_init: 132 sctp_eps_proc_exit(); 133 out_eps_proc_init: 134 sctp_snmp_proc_exit(); 135 out_snmp_proc_init: 136 if (proc_net_sctp) { 137 proc_net_sctp = NULL; 138 remove_proc_entry("sctp", init_net.proc_net); 139 } 140 out_free_percpu: 141 percpu_counter_destroy(&sctp_sockets_allocated); 142 #else 143 return 0; 144 #endif /* CONFIG_PROC_FS */ 145 146 out_nomem: 147 return -ENOMEM; 148 } 149 150 /* Clean up the proc fs entry for the SCTP protocol. 151 * Note: Do not make this __exit as it is used in the init error 152 * path. 153 */ 154 static void sctp_proc_exit(void) 155 { 156 #ifdef CONFIG_PROC_FS 157 sctp_snmp_proc_exit(); 158 sctp_eps_proc_exit(); 159 sctp_assocs_proc_exit(); 160 sctp_remaddr_proc_exit(); 161 162 if (proc_net_sctp) { 163 proc_net_sctp = NULL; 164 remove_proc_entry("sctp", init_net.proc_net); 165 } 166 #endif 167 } 168 169 /* Private helper to extract ipv4 address and stash them in 170 * the protocol structure. 171 */ 172 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 173 struct net_device *dev) 174 { 175 struct in_device *in_dev; 176 struct in_ifaddr *ifa; 177 struct sctp_sockaddr_entry *addr; 178 179 rcu_read_lock(); 180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 181 rcu_read_unlock(); 182 return; 183 } 184 185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 186 /* Add the address to the local list. */ 187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 188 if (addr) { 189 addr->a.v4.sin_family = AF_INET; 190 addr->a.v4.sin_port = 0; 191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 192 addr->valid = 1; 193 INIT_LIST_HEAD(&addr->list); 194 INIT_RCU_HEAD(&addr->rcu); 195 list_add_tail(&addr->list, addrlist); 196 } 197 } 198 199 rcu_read_unlock(); 200 } 201 202 /* Extract our IP addresses from the system and stash them in the 203 * protocol structure. 204 */ 205 static void sctp_get_local_addr_list(void) 206 { 207 struct net_device *dev; 208 struct list_head *pos; 209 struct sctp_af *af; 210 211 read_lock(&dev_base_lock); 212 for_each_netdev(&init_net, dev) { 213 __list_for_each(pos, &sctp_address_families) { 214 af = list_entry(pos, struct sctp_af, list); 215 af->copy_addrlist(&sctp_local_addr_list, dev); 216 } 217 } 218 read_unlock(&dev_base_lock); 219 } 220 221 /* Free the existing local addresses. */ 222 static void sctp_free_local_addr_list(void) 223 { 224 struct sctp_sockaddr_entry *addr; 225 struct list_head *pos, *temp; 226 227 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 228 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 229 list_del(pos); 230 kfree(addr); 231 } 232 } 233 234 void sctp_local_addr_free(struct rcu_head *head) 235 { 236 struct sctp_sockaddr_entry *e = container_of(head, 237 struct sctp_sockaddr_entry, rcu); 238 kfree(e); 239 } 240 241 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 242 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 243 gfp_t gfp, int copy_flags) 244 { 245 struct sctp_sockaddr_entry *addr; 246 int error = 0; 247 248 rcu_read_lock(); 249 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 250 if (!addr->valid) 251 continue; 252 if (sctp_in_scope(&addr->a, scope)) { 253 /* Now that the address is in scope, check to see if 254 * the address type is really supported by the local 255 * sock as well as the remote peer. 256 */ 257 if ((((AF_INET == addr->a.sa.sa_family) && 258 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 259 (((AF_INET6 == addr->a.sa.sa_family) && 260 (copy_flags & SCTP_ADDR6_ALLOWED) && 261 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 262 error = sctp_add_bind_addr(bp, &addr->a, 263 SCTP_ADDR_SRC, GFP_ATOMIC); 264 if (error) 265 goto end_copy; 266 } 267 } 268 } 269 270 end_copy: 271 rcu_read_unlock(); 272 return error; 273 } 274 275 /* Initialize a sctp_addr from in incoming skb. */ 276 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 277 int is_saddr) 278 { 279 void *from; 280 __be16 *port; 281 struct sctphdr *sh; 282 283 port = &addr->v4.sin_port; 284 addr->v4.sin_family = AF_INET; 285 286 sh = sctp_hdr(skb); 287 if (is_saddr) { 288 *port = sh->source; 289 from = &ip_hdr(skb)->saddr; 290 } else { 291 *port = sh->dest; 292 from = &ip_hdr(skb)->daddr; 293 } 294 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 295 } 296 297 /* Initialize an sctp_addr from a socket. */ 298 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 299 { 300 addr->v4.sin_family = AF_INET; 301 addr->v4.sin_port = 0; 302 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; 303 } 304 305 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 306 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 307 { 308 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; 309 } 310 311 /* Initialize sk->sk_daddr from sctp_addr. */ 312 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 313 { 314 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; 315 } 316 317 /* Initialize a sctp_addr from an address parameter. */ 318 static void sctp_v4_from_addr_param(union sctp_addr *addr, 319 union sctp_addr_param *param, 320 __be16 port, int iif) 321 { 322 addr->v4.sin_family = AF_INET; 323 addr->v4.sin_port = port; 324 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 325 } 326 327 /* Initialize an address parameter from a sctp_addr and return the length 328 * of the address parameter. 329 */ 330 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 331 union sctp_addr_param *param) 332 { 333 int length = sizeof(sctp_ipv4addr_param_t); 334 335 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 336 param->v4.param_hdr.length = htons(length); 337 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 338 339 return length; 340 } 341 342 /* Initialize a sctp_addr from a dst_entry. */ 343 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 344 __be16 port) 345 { 346 struct rtable *rt = (struct rtable *)dst; 347 saddr->v4.sin_family = AF_INET; 348 saddr->v4.sin_port = port; 349 saddr->v4.sin_addr.s_addr = rt->rt_src; 350 } 351 352 /* Compare two addresses exactly. */ 353 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 354 const union sctp_addr *addr2) 355 { 356 if (addr1->sa.sa_family != addr2->sa.sa_family) 357 return 0; 358 if (addr1->v4.sin_port != addr2->v4.sin_port) 359 return 0; 360 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 361 return 0; 362 363 return 1; 364 } 365 366 /* Initialize addr struct to INADDR_ANY. */ 367 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 368 { 369 addr->v4.sin_family = AF_INET; 370 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 371 addr->v4.sin_port = port; 372 } 373 374 /* Is this a wildcard address? */ 375 static int sctp_v4_is_any(const union sctp_addr *addr) 376 { 377 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 378 } 379 380 /* This function checks if the address is a valid address to be used for 381 * SCTP binding. 382 * 383 * Output: 384 * Return 0 - If the address is a non-unicast or an illegal address. 385 * Return 1 - If the address is a unicast. 386 */ 387 static int sctp_v4_addr_valid(union sctp_addr *addr, 388 struct sctp_sock *sp, 389 const struct sk_buff *skb) 390 { 391 /* IPv4 addresses not allowed */ 392 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 393 return 0; 394 395 /* Is this a non-unicast address or a unusable SCTP address? */ 396 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 397 return 0; 398 399 /* Is this a broadcast address? */ 400 if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) 401 return 0; 402 403 return 1; 404 } 405 406 /* Should this be available for binding? */ 407 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 408 { 409 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 410 411 412 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 413 ret != RTN_LOCAL && 414 !sp->inet.freebind && 415 !sysctl_ip_nonlocal_bind) 416 return 0; 417 418 if (ipv6_only_sock(sctp_opt2sk(sp))) 419 return 0; 420 421 return 1; 422 } 423 424 /* Checking the loopback, private and other address scopes as defined in 425 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 426 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 427 * 428 * Level 0 - unusable SCTP addresses 429 * Level 1 - loopback address 430 * Level 2 - link-local addresses 431 * Level 3 - private addresses. 432 * Level 4 - global addresses 433 * For INIT and INIT-ACK address list, let L be the level of 434 * of requested destination address, sender and receiver 435 * SHOULD include all of its addresses with level greater 436 * than or equal to L. 437 */ 438 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 439 { 440 sctp_scope_t retval; 441 442 /* Should IPv4 scoping be a sysctl configurable option 443 * so users can turn it off (default on) for certain 444 * unconventional networking environments? 445 */ 446 447 /* Check for unusable SCTP addresses. */ 448 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 449 retval = SCTP_SCOPE_UNUSABLE; 450 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 451 retval = SCTP_SCOPE_LOOPBACK; 452 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 453 retval = SCTP_SCOPE_LINK; 454 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 455 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 456 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 457 retval = SCTP_SCOPE_PRIVATE; 458 } else { 459 retval = SCTP_SCOPE_GLOBAL; 460 } 461 462 return retval; 463 } 464 465 /* Returns a valid dst cache entry for the given source and destination ip 466 * addresses. If an association is passed, trys to get a dst entry with a 467 * source address that matches an address in the bind address list. 468 */ 469 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 470 union sctp_addr *daddr, 471 union sctp_addr *saddr) 472 { 473 struct rtable *rt; 474 struct flowi fl; 475 struct sctp_bind_addr *bp; 476 struct sctp_sockaddr_entry *laddr; 477 struct dst_entry *dst = NULL; 478 union sctp_addr dst_saddr; 479 480 memset(&fl, 0x0, sizeof(struct flowi)); 481 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 482 fl.proto = IPPROTO_SCTP; 483 if (asoc) { 484 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 485 fl.oif = asoc->base.sk->sk_bound_dev_if; 486 } 487 if (saddr) 488 fl.fl4_src = saddr->v4.sin_addr.s_addr; 489 490 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 491 __func__, &fl.fl4_dst, &fl.fl4_src); 492 493 if (!ip_route_output_key(&init_net, &rt, &fl)) { 494 dst = &rt->u.dst; 495 } 496 497 /* If there is no association or if a source address is passed, no 498 * more validation is required. 499 */ 500 if (!asoc || saddr) 501 goto out; 502 503 bp = &asoc->base.bind_addr; 504 505 if (dst) { 506 /* Walk through the bind address list and look for a bind 507 * address that matches the source address of the returned dst. 508 */ 509 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 510 rcu_read_lock(); 511 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 512 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 513 continue; 514 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 515 goto out_unlock; 516 } 517 rcu_read_unlock(); 518 519 /* None of the bound addresses match the source address of the 520 * dst. So release it. 521 */ 522 dst_release(dst); 523 dst = NULL; 524 } 525 526 /* Walk through the bind address list and try to get a dst that 527 * matches a bind address as the source address. 528 */ 529 rcu_read_lock(); 530 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 531 if (!laddr->valid) 532 continue; 533 if ((laddr->state == SCTP_ADDR_SRC) && 534 (AF_INET == laddr->a.sa.sa_family)) { 535 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 536 if (!ip_route_output_key(&init_net, &rt, &fl)) { 537 dst = &rt->u.dst; 538 goto out_unlock; 539 } 540 } 541 } 542 543 out_unlock: 544 rcu_read_unlock(); 545 out: 546 if (dst) 547 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 548 &rt->rt_dst, &rt->rt_src); 549 else 550 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 551 552 return dst; 553 } 554 555 /* For v4, the source address is cached in the route entry(dst). So no need 556 * to cache it separately and hence this is an empty routine. 557 */ 558 static void sctp_v4_get_saddr(struct sctp_sock *sk, 559 struct sctp_association *asoc, 560 struct dst_entry *dst, 561 union sctp_addr *daddr, 562 union sctp_addr *saddr) 563 { 564 struct rtable *rt = (struct rtable *)dst; 565 566 if (!asoc) 567 return; 568 569 if (rt) { 570 saddr->v4.sin_family = AF_INET; 571 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 572 saddr->v4.sin_addr.s_addr = rt->rt_src; 573 } 574 } 575 576 /* What interface did this skb arrive on? */ 577 static int sctp_v4_skb_iif(const struct sk_buff *skb) 578 { 579 return skb->rtable->rt_iif; 580 } 581 582 /* Was this packet marked by Explicit Congestion Notification? */ 583 static int sctp_v4_is_ce(const struct sk_buff *skb) 584 { 585 return INET_ECN_is_ce(ip_hdr(skb)->tos); 586 } 587 588 /* Create and initialize a new sk for the socket returned by accept(). */ 589 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 590 struct sctp_association *asoc) 591 { 592 struct inet_sock *inet = inet_sk(sk); 593 struct inet_sock *newinet; 594 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 595 sk->sk_prot); 596 597 if (!newsk) 598 goto out; 599 600 sock_init_data(NULL, newsk); 601 602 newsk->sk_type = SOCK_STREAM; 603 604 newsk->sk_no_check = sk->sk_no_check; 605 newsk->sk_reuse = sk->sk_reuse; 606 newsk->sk_shutdown = sk->sk_shutdown; 607 608 newsk->sk_destruct = inet_sock_destruct; 609 newsk->sk_family = PF_INET; 610 newsk->sk_protocol = IPPROTO_SCTP; 611 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 612 sock_reset_flag(newsk, SOCK_ZAPPED); 613 614 newinet = inet_sk(newsk); 615 616 /* Initialize sk's sport, dport, rcv_saddr and daddr for 617 * getsockname() and getpeername() 618 */ 619 newinet->sport = inet->sport; 620 newinet->saddr = inet->saddr; 621 newinet->rcv_saddr = inet->rcv_saddr; 622 newinet->dport = htons(asoc->peer.port); 623 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 624 newinet->pmtudisc = inet->pmtudisc; 625 newinet->id = asoc->next_tsn ^ jiffies; 626 627 newinet->uc_ttl = -1; 628 newinet->mc_loop = 1; 629 newinet->mc_ttl = 1; 630 newinet->mc_index = 0; 631 newinet->mc_list = NULL; 632 633 sk_refcnt_debug_inc(newsk); 634 635 if (newsk->sk_prot->init(newsk)) { 636 sk_common_release(newsk); 637 newsk = NULL; 638 } 639 640 out: 641 return newsk; 642 } 643 644 /* Map address, empty for v4 family */ 645 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 646 { 647 /* Empty */ 648 } 649 650 /* Dump the v4 addr to the seq file. */ 651 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 652 { 653 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 654 } 655 656 static void sctp_v4_ecn_capable(struct sock *sk) 657 { 658 INET_ECN_xmit(sk); 659 } 660 661 /* Event handler for inet address addition/deletion events. 662 * The sctp_local_addr_list needs to be protocted by a spin lock since 663 * multiple notifiers (say IPv4 and IPv6) may be running at the same 664 * time and thus corrupt the list. 665 * The reader side is protected with RCU. 666 */ 667 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 668 void *ptr) 669 { 670 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 671 struct sctp_sockaddr_entry *addr = NULL; 672 struct sctp_sockaddr_entry *temp; 673 int found = 0; 674 675 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 676 return NOTIFY_DONE; 677 678 switch (ev) { 679 case NETDEV_UP: 680 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 681 if (addr) { 682 addr->a.v4.sin_family = AF_INET; 683 addr->a.v4.sin_port = 0; 684 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 685 addr->valid = 1; 686 spin_lock_bh(&sctp_local_addr_lock); 687 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 688 spin_unlock_bh(&sctp_local_addr_lock); 689 } 690 break; 691 case NETDEV_DOWN: 692 spin_lock_bh(&sctp_local_addr_lock); 693 list_for_each_entry_safe(addr, temp, 694 &sctp_local_addr_list, list) { 695 if (addr->a.sa.sa_family == AF_INET && 696 addr->a.v4.sin_addr.s_addr == 697 ifa->ifa_local) { 698 found = 1; 699 addr->valid = 0; 700 list_del_rcu(&addr->list); 701 break; 702 } 703 } 704 spin_unlock_bh(&sctp_local_addr_lock); 705 if (found) 706 call_rcu(&addr->rcu, sctp_local_addr_free); 707 break; 708 } 709 710 return NOTIFY_DONE; 711 } 712 713 /* 714 * Initialize the control inode/socket with a control endpoint data 715 * structure. This endpoint is reserved exclusively for the OOTB processing. 716 */ 717 static int sctp_ctl_sock_init(void) 718 { 719 int err; 720 sa_family_t family = PF_INET; 721 722 if (sctp_get_pf_specific(PF_INET6)) 723 family = PF_INET6; 724 725 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 726 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 727 728 /* If IPv6 socket could not be created, try the IPv4 socket */ 729 if (err < 0 && family == PF_INET6) 730 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 731 SOCK_SEQPACKET, IPPROTO_SCTP, 732 &init_net); 733 734 if (err < 0) { 735 printk(KERN_ERR 736 "SCTP: Failed to create the SCTP control socket.\n"); 737 return err; 738 } 739 return 0; 740 } 741 742 /* Register address family specific functions. */ 743 int sctp_register_af(struct sctp_af *af) 744 { 745 switch (af->sa_family) { 746 case AF_INET: 747 if (sctp_af_v4_specific) 748 return 0; 749 sctp_af_v4_specific = af; 750 break; 751 case AF_INET6: 752 if (sctp_af_v6_specific) 753 return 0; 754 sctp_af_v6_specific = af; 755 break; 756 default: 757 return 0; 758 } 759 760 INIT_LIST_HEAD(&af->list); 761 list_add_tail(&af->list, &sctp_address_families); 762 return 1; 763 } 764 765 /* Get the table of functions for manipulating a particular address 766 * family. 767 */ 768 struct sctp_af *sctp_get_af_specific(sa_family_t family) 769 { 770 switch (family) { 771 case AF_INET: 772 return sctp_af_v4_specific; 773 case AF_INET6: 774 return sctp_af_v6_specific; 775 default: 776 return NULL; 777 } 778 } 779 780 /* Common code to initialize a AF_INET msg_name. */ 781 static void sctp_inet_msgname(char *msgname, int *addr_len) 782 { 783 struct sockaddr_in *sin; 784 785 sin = (struct sockaddr_in *)msgname; 786 *addr_len = sizeof(struct sockaddr_in); 787 sin->sin_family = AF_INET; 788 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 789 } 790 791 /* Copy the primary address of the peer primary address as the msg_name. */ 792 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 793 int *addr_len) 794 { 795 struct sockaddr_in *sin, *sinfrom; 796 797 if (msgname) { 798 struct sctp_association *asoc; 799 800 asoc = event->asoc; 801 sctp_inet_msgname(msgname, addr_len); 802 sin = (struct sockaddr_in *)msgname; 803 sinfrom = &asoc->peer.primary_addr.v4; 804 sin->sin_port = htons(asoc->peer.port); 805 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 806 } 807 } 808 809 /* Initialize and copy out a msgname from an inbound skb. */ 810 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 811 { 812 if (msgname) { 813 struct sctphdr *sh = sctp_hdr(skb); 814 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 815 816 sctp_inet_msgname(msgname, len); 817 sin->sin_port = sh->source; 818 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 819 } 820 } 821 822 /* Do we support this AF? */ 823 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 824 { 825 /* PF_INET only supports AF_INET addresses. */ 826 return (AF_INET == family); 827 } 828 829 /* Address matching with wildcards allowed. */ 830 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 831 const union sctp_addr *addr2, 832 struct sctp_sock *opt) 833 { 834 /* PF_INET only supports AF_INET addresses. */ 835 if (addr1->sa.sa_family != addr2->sa.sa_family) 836 return 0; 837 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 838 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 839 return 1; 840 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 841 return 1; 842 843 return 0; 844 } 845 846 /* Verify that provided sockaddr looks bindable. Common verification has 847 * already been taken care of. 848 */ 849 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 850 { 851 return sctp_v4_available(addr, opt); 852 } 853 854 /* Verify that sockaddr looks sendable. Common verification has already 855 * been taken care of. 856 */ 857 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 858 { 859 return 1; 860 } 861 862 /* Fill in Supported Address Type information for INIT and INIT-ACK 863 * chunks. Returns number of addresses supported. 864 */ 865 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 866 __be16 *types) 867 { 868 types[0] = SCTP_PARAM_IPV4_ADDRESS; 869 return 1; 870 } 871 872 /* Wrapper routine that calls the ip transmit routine. */ 873 static inline int sctp_v4_xmit(struct sk_buff *skb, 874 struct sctp_transport *transport) 875 { 876 struct inet_sock *inet = inet_sk(skb->sk); 877 878 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 879 __func__, skb, skb->len, 880 &skb->rtable->rt_src, 881 &skb->rtable->rt_dst); 882 883 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 884 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 885 886 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 887 return ip_queue_xmit(skb, 0); 888 } 889 890 static struct sctp_af sctp_af_inet; 891 892 static struct sctp_pf sctp_pf_inet = { 893 .event_msgname = sctp_inet_event_msgname, 894 .skb_msgname = sctp_inet_skb_msgname, 895 .af_supported = sctp_inet_af_supported, 896 .cmp_addr = sctp_inet_cmp_addr, 897 .bind_verify = sctp_inet_bind_verify, 898 .send_verify = sctp_inet_send_verify, 899 .supported_addrs = sctp_inet_supported_addrs, 900 .create_accept_sk = sctp_v4_create_accept_sk, 901 .addr_v4map = sctp_v4_addr_v4map, 902 .af = &sctp_af_inet 903 }; 904 905 /* Notifier for inetaddr addition/deletion events. */ 906 static struct notifier_block sctp_inetaddr_notifier = { 907 .notifier_call = sctp_inetaddr_event, 908 }; 909 910 /* Socket operations. */ 911 static const struct proto_ops inet_seqpacket_ops = { 912 .family = PF_INET, 913 .owner = THIS_MODULE, 914 .release = inet_release, /* Needs to be wrapped... */ 915 .bind = inet_bind, 916 .connect = inet_dgram_connect, 917 .socketpair = sock_no_socketpair, 918 .accept = inet_accept, 919 .getname = inet_getname, /* Semantics are different. */ 920 .poll = sctp_poll, 921 .ioctl = inet_ioctl, 922 .listen = sctp_inet_listen, 923 .shutdown = inet_shutdown, /* Looks harmless. */ 924 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 925 .getsockopt = sock_common_getsockopt, 926 .sendmsg = inet_sendmsg, 927 .recvmsg = sock_common_recvmsg, 928 .mmap = sock_no_mmap, 929 .sendpage = sock_no_sendpage, 930 #ifdef CONFIG_COMPAT 931 .compat_setsockopt = compat_sock_common_setsockopt, 932 .compat_getsockopt = compat_sock_common_getsockopt, 933 #endif 934 }; 935 936 /* Registration with AF_INET family. */ 937 static struct inet_protosw sctp_seqpacket_protosw = { 938 .type = SOCK_SEQPACKET, 939 .protocol = IPPROTO_SCTP, 940 .prot = &sctp_prot, 941 .ops = &inet_seqpacket_ops, 942 .capability = -1, 943 .no_check = 0, 944 .flags = SCTP_PROTOSW_FLAG 945 }; 946 static struct inet_protosw sctp_stream_protosw = { 947 .type = SOCK_STREAM, 948 .protocol = IPPROTO_SCTP, 949 .prot = &sctp_prot, 950 .ops = &inet_seqpacket_ops, 951 .capability = -1, 952 .no_check = 0, 953 .flags = SCTP_PROTOSW_FLAG 954 }; 955 956 /* Register with IP layer. */ 957 static struct net_protocol sctp_protocol = { 958 .handler = sctp_rcv, 959 .err_handler = sctp_v4_err, 960 .no_policy = 1, 961 }; 962 963 /* IPv4 address related functions. */ 964 static struct sctp_af sctp_af_inet = { 965 .sa_family = AF_INET, 966 .sctp_xmit = sctp_v4_xmit, 967 .setsockopt = ip_setsockopt, 968 .getsockopt = ip_getsockopt, 969 .get_dst = sctp_v4_get_dst, 970 .get_saddr = sctp_v4_get_saddr, 971 .copy_addrlist = sctp_v4_copy_addrlist, 972 .from_skb = sctp_v4_from_skb, 973 .from_sk = sctp_v4_from_sk, 974 .to_sk_saddr = sctp_v4_to_sk_saddr, 975 .to_sk_daddr = sctp_v4_to_sk_daddr, 976 .from_addr_param = sctp_v4_from_addr_param, 977 .to_addr_param = sctp_v4_to_addr_param, 978 .dst_saddr = sctp_v4_dst_saddr, 979 .cmp_addr = sctp_v4_cmp_addr, 980 .addr_valid = sctp_v4_addr_valid, 981 .inaddr_any = sctp_v4_inaddr_any, 982 .is_any = sctp_v4_is_any, 983 .available = sctp_v4_available, 984 .scope = sctp_v4_scope, 985 .skb_iif = sctp_v4_skb_iif, 986 .is_ce = sctp_v4_is_ce, 987 .seq_dump_addr = sctp_v4_seq_dump_addr, 988 .ecn_capable = sctp_v4_ecn_capable, 989 .net_header_len = sizeof(struct iphdr), 990 .sockaddr_len = sizeof(struct sockaddr_in), 991 #ifdef CONFIG_COMPAT 992 .compat_setsockopt = compat_ip_setsockopt, 993 .compat_getsockopt = compat_ip_getsockopt, 994 #endif 995 }; 996 997 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 998 999 switch (family) { 1000 case PF_INET: 1001 return sctp_pf_inet_specific; 1002 case PF_INET6: 1003 return sctp_pf_inet6_specific; 1004 default: 1005 return NULL; 1006 } 1007 } 1008 1009 /* Register the PF specific function table. */ 1010 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1011 { 1012 switch (family) { 1013 case PF_INET: 1014 if (sctp_pf_inet_specific) 1015 return 0; 1016 sctp_pf_inet_specific = pf; 1017 break; 1018 case PF_INET6: 1019 if (sctp_pf_inet6_specific) 1020 return 0; 1021 sctp_pf_inet6_specific = pf; 1022 break; 1023 default: 1024 return 0; 1025 } 1026 return 1; 1027 } 1028 1029 static inline int init_sctp_mibs(void) 1030 { 1031 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); 1032 } 1033 1034 static inline void cleanup_sctp_mibs(void) 1035 { 1036 snmp_mib_free((void**)sctp_statistics); 1037 } 1038 1039 static void sctp_v4_pf_init(void) 1040 { 1041 /* Initialize the SCTP specific PF functions. */ 1042 sctp_register_pf(&sctp_pf_inet, PF_INET); 1043 sctp_register_af(&sctp_af_inet); 1044 } 1045 1046 static void sctp_v4_pf_exit(void) 1047 { 1048 list_del(&sctp_af_inet.list); 1049 } 1050 1051 static int sctp_v4_protosw_init(void) 1052 { 1053 int rc; 1054 1055 rc = proto_register(&sctp_prot, 1); 1056 if (rc) 1057 return rc; 1058 1059 /* Register SCTP(UDP and TCP style) with socket layer. */ 1060 inet_register_protosw(&sctp_seqpacket_protosw); 1061 inet_register_protosw(&sctp_stream_protosw); 1062 1063 return 0; 1064 } 1065 1066 static void sctp_v4_protosw_exit(void) 1067 { 1068 inet_unregister_protosw(&sctp_stream_protosw); 1069 inet_unregister_protosw(&sctp_seqpacket_protosw); 1070 proto_unregister(&sctp_prot); 1071 } 1072 1073 static int sctp_v4_add_protocol(void) 1074 { 1075 /* Register notifier for inet address additions/deletions. */ 1076 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1077 1078 /* Register SCTP with inet layer. */ 1079 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1080 return -EAGAIN; 1081 1082 return 0; 1083 } 1084 1085 static void sctp_v4_del_protocol(void) 1086 { 1087 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1088 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1089 } 1090 1091 /* Initialize the universe into something sensible. */ 1092 SCTP_STATIC __init int sctp_init(void) 1093 { 1094 int i; 1095 int status = -EINVAL; 1096 unsigned long goal; 1097 unsigned long limit; 1098 unsigned long nr_pages; 1099 int max_share; 1100 int order; 1101 1102 /* SCTP_DEBUG sanity check. */ 1103 if (!sctp_sanity_check()) 1104 goto out; 1105 1106 /* Allocate bind_bucket and chunk caches. */ 1107 status = -ENOBUFS; 1108 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1109 sizeof(struct sctp_bind_bucket), 1110 0, SLAB_HWCACHE_ALIGN, 1111 NULL); 1112 if (!sctp_bucket_cachep) 1113 goto out; 1114 1115 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1116 sizeof(struct sctp_chunk), 1117 0, SLAB_HWCACHE_ALIGN, 1118 NULL); 1119 if (!sctp_chunk_cachep) 1120 goto err_chunk_cachep; 1121 1122 /* Allocate and initialise sctp mibs. */ 1123 status = init_sctp_mibs(); 1124 if (status) 1125 goto err_init_mibs; 1126 1127 /* Initialize proc fs directory. */ 1128 status = sctp_proc_init(); 1129 if (status) 1130 goto err_init_proc; 1131 1132 /* Initialize object count debugging. */ 1133 sctp_dbg_objcnt_init(); 1134 1135 /* 1136 * 14. Suggested SCTP Protocol Parameter Values 1137 */ 1138 /* The following protocol parameters are RECOMMENDED: */ 1139 /* RTO.Initial - 3 seconds */ 1140 sctp_rto_initial = SCTP_RTO_INITIAL; 1141 /* RTO.Min - 1 second */ 1142 sctp_rto_min = SCTP_RTO_MIN; 1143 /* RTO.Max - 60 seconds */ 1144 sctp_rto_max = SCTP_RTO_MAX; 1145 /* RTO.Alpha - 1/8 */ 1146 sctp_rto_alpha = SCTP_RTO_ALPHA; 1147 /* RTO.Beta - 1/4 */ 1148 sctp_rto_beta = SCTP_RTO_BETA; 1149 1150 /* Valid.Cookie.Life - 60 seconds */ 1151 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1152 1153 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1154 sctp_cookie_preserve_enable = 1; 1155 1156 /* Max.Burst - 4 */ 1157 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1158 1159 /* Association.Max.Retrans - 10 attempts 1160 * Path.Max.Retrans - 5 attempts (per destination address) 1161 * Max.Init.Retransmits - 8 attempts 1162 */ 1163 sctp_max_retrans_association = 10; 1164 sctp_max_retrans_path = 5; 1165 sctp_max_retrans_init = 8; 1166 1167 /* Sendbuffer growth - do per-socket accounting */ 1168 sctp_sndbuf_policy = 0; 1169 1170 /* Rcvbuffer growth - do per-socket accounting */ 1171 sctp_rcvbuf_policy = 0; 1172 1173 /* HB.interval - 30 seconds */ 1174 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1175 1176 /* delayed SACK timeout */ 1177 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1178 1179 /* Implementation specific variables. */ 1180 1181 /* Initialize default stream count setup information. */ 1182 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1183 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1184 1185 /* Initialize handle used for association ids. */ 1186 idr_init(&sctp_assocs_id); 1187 1188 /* Set the pressure threshold to be a fraction of global memory that 1189 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1190 * memory, with a floor of 128 pages. 1191 * Note this initalizes the data in sctpv6_prot too 1192 * Unabashedly stolen from tcp_init 1193 */ 1194 nr_pages = totalram_pages - totalhigh_pages; 1195 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1196 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1197 limit = max(limit, 128UL); 1198 sysctl_sctp_mem[0] = limit / 4 * 3; 1199 sysctl_sctp_mem[1] = limit; 1200 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1201 1202 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1203 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1204 max_share = min(4UL*1024*1024, limit); 1205 1206 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1207 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1208 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1209 1210 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1211 sysctl_sctp_wmem[1] = 16*1024; 1212 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1213 1214 /* Size and allocate the association hash table. 1215 * The methodology is similar to that of the tcp hash tables. 1216 */ 1217 if (num_physpages >= (128 * 1024)) 1218 goal = num_physpages >> (22 - PAGE_SHIFT); 1219 else 1220 goal = num_physpages >> (24 - PAGE_SHIFT); 1221 1222 for (order = 0; (1UL << order) < goal; order++) 1223 ; 1224 1225 do { 1226 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1227 sizeof(struct sctp_hashbucket); 1228 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1229 continue; 1230 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1231 __get_free_pages(GFP_ATOMIC, order); 1232 } while (!sctp_assoc_hashtable && --order > 0); 1233 if (!sctp_assoc_hashtable) { 1234 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1235 status = -ENOMEM; 1236 goto err_ahash_alloc; 1237 } 1238 for (i = 0; i < sctp_assoc_hashsize; i++) { 1239 rwlock_init(&sctp_assoc_hashtable[i].lock); 1240 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1241 } 1242 1243 /* Allocate and initialize the endpoint hash table. */ 1244 sctp_ep_hashsize = 64; 1245 sctp_ep_hashtable = (struct sctp_hashbucket *) 1246 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1247 if (!sctp_ep_hashtable) { 1248 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1249 status = -ENOMEM; 1250 goto err_ehash_alloc; 1251 } 1252 for (i = 0; i < sctp_ep_hashsize; i++) { 1253 rwlock_init(&sctp_ep_hashtable[i].lock); 1254 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1255 } 1256 1257 /* Allocate and initialize the SCTP port hash table. */ 1258 do { 1259 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1260 sizeof(struct sctp_bind_hashbucket); 1261 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1262 continue; 1263 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1264 __get_free_pages(GFP_ATOMIC, order); 1265 } while (!sctp_port_hashtable && --order > 0); 1266 if (!sctp_port_hashtable) { 1267 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1268 status = -ENOMEM; 1269 goto err_bhash_alloc; 1270 } 1271 for (i = 0; i < sctp_port_hashsize; i++) { 1272 spin_lock_init(&sctp_port_hashtable[i].lock); 1273 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1274 } 1275 1276 printk(KERN_INFO "SCTP: Hash tables configured " 1277 "(established %d bind %d)\n", 1278 sctp_assoc_hashsize, sctp_port_hashsize); 1279 1280 /* Disable ADDIP by default. */ 1281 sctp_addip_enable = 0; 1282 sctp_addip_noauth = 0; 1283 1284 /* Enable PR-SCTP by default. */ 1285 sctp_prsctp_enable = 1; 1286 1287 /* Disable AUTH by default. */ 1288 sctp_auth_enable = 0; 1289 1290 sctp_sysctl_register(); 1291 1292 INIT_LIST_HEAD(&sctp_address_families); 1293 sctp_v4_pf_init(); 1294 sctp_v6_pf_init(); 1295 1296 /* Initialize the local address list. */ 1297 INIT_LIST_HEAD(&sctp_local_addr_list); 1298 spin_lock_init(&sctp_local_addr_lock); 1299 sctp_get_local_addr_list(); 1300 1301 status = sctp_v4_protosw_init(); 1302 1303 if (status) 1304 goto err_protosw_init; 1305 1306 status = sctp_v6_protosw_init(); 1307 if (status) 1308 goto err_v6_protosw_init; 1309 1310 /* Initialize the control inode/socket for handling OOTB packets. */ 1311 if ((status = sctp_ctl_sock_init())) { 1312 printk (KERN_ERR 1313 "SCTP: Failed to initialize the SCTP control sock.\n"); 1314 goto err_ctl_sock_init; 1315 } 1316 1317 status = sctp_v4_add_protocol(); 1318 if (status) 1319 goto err_add_protocol; 1320 1321 /* Register SCTP with inet6 layer. */ 1322 status = sctp_v6_add_protocol(); 1323 if (status) 1324 goto err_v6_add_protocol; 1325 1326 status = 0; 1327 out: 1328 return status; 1329 err_v6_add_protocol: 1330 sctp_v4_del_protocol(); 1331 err_add_protocol: 1332 inet_ctl_sock_destroy(sctp_ctl_sock); 1333 err_ctl_sock_init: 1334 sctp_v6_protosw_exit(); 1335 err_v6_protosw_init: 1336 sctp_v4_protosw_exit(); 1337 err_protosw_init: 1338 sctp_free_local_addr_list(); 1339 sctp_v4_pf_exit(); 1340 sctp_v6_pf_exit(); 1341 sctp_sysctl_unregister(); 1342 free_pages((unsigned long)sctp_port_hashtable, 1343 get_order(sctp_port_hashsize * 1344 sizeof(struct sctp_bind_hashbucket))); 1345 err_bhash_alloc: 1346 kfree(sctp_ep_hashtable); 1347 err_ehash_alloc: 1348 free_pages((unsigned long)sctp_assoc_hashtable, 1349 get_order(sctp_assoc_hashsize * 1350 sizeof(struct sctp_hashbucket))); 1351 err_ahash_alloc: 1352 sctp_dbg_objcnt_exit(); 1353 sctp_proc_exit(); 1354 err_init_proc: 1355 cleanup_sctp_mibs(); 1356 err_init_mibs: 1357 kmem_cache_destroy(sctp_chunk_cachep); 1358 err_chunk_cachep: 1359 kmem_cache_destroy(sctp_bucket_cachep); 1360 goto out; 1361 } 1362 1363 /* Exit handler for the SCTP protocol. */ 1364 SCTP_STATIC __exit void sctp_exit(void) 1365 { 1366 /* BUG. This should probably do something useful like clean 1367 * up all the remaining associations and all that memory. 1368 */ 1369 1370 /* Unregister with inet6/inet layers. */ 1371 sctp_v6_del_protocol(); 1372 sctp_v4_del_protocol(); 1373 1374 /* Free the control endpoint. */ 1375 inet_ctl_sock_destroy(sctp_ctl_sock); 1376 1377 /* Free protosw registrations */ 1378 sctp_v6_protosw_exit(); 1379 sctp_v4_protosw_exit(); 1380 1381 /* Free the local address list. */ 1382 sctp_free_local_addr_list(); 1383 1384 /* Unregister with socket layer. */ 1385 sctp_v6_pf_exit(); 1386 sctp_v4_pf_exit(); 1387 1388 sctp_sysctl_unregister(); 1389 1390 free_pages((unsigned long)sctp_assoc_hashtable, 1391 get_order(sctp_assoc_hashsize * 1392 sizeof(struct sctp_hashbucket))); 1393 kfree(sctp_ep_hashtable); 1394 free_pages((unsigned long)sctp_port_hashtable, 1395 get_order(sctp_port_hashsize * 1396 sizeof(struct sctp_bind_hashbucket))); 1397 1398 sctp_dbg_objcnt_exit(); 1399 sctp_proc_exit(); 1400 cleanup_sctp_mibs(); 1401 1402 kmem_cache_destroy(sctp_chunk_cachep); 1403 kmem_cache_destroy(sctp_bucket_cachep); 1404 } 1405 1406 module_init(sctp_init); 1407 module_exit(sctp_exit); 1408 1409 /* 1410 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1411 */ 1412 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1413 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1414 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1415 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1416 MODULE_LICENSE("GPL"); 1417