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