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 socket *sctp_ctl_socket; 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_socket->sk; 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 && ((struct rtable *)skb->dst)->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 __FUNCTION__, 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 rcu_read_lock(); 474 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 475 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 476 continue; 477 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 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_association *asoc, 523 struct dst_entry *dst, 524 union sctp_addr *daddr, 525 union sctp_addr *saddr) 526 { 527 struct rtable *rt = (struct rtable *)dst; 528 529 if (!asoc) 530 return; 531 532 if (rt) { 533 saddr->v4.sin_family = AF_INET; 534 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 535 saddr->v4.sin_addr.s_addr = rt->rt_src; 536 } 537 } 538 539 /* What interface did this skb arrive on? */ 540 static int sctp_v4_skb_iif(const struct sk_buff *skb) 541 { 542 return ((struct rtable *)skb->dst)->rt_iif; 543 } 544 545 /* Was this packet marked by Explicit Congestion Notification? */ 546 static int sctp_v4_is_ce(const struct sk_buff *skb) 547 { 548 return INET_ECN_is_ce(ip_hdr(skb)->tos); 549 } 550 551 /* Create and initialize a new sk for the socket returned by accept(). */ 552 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 553 struct sctp_association *asoc) 554 { 555 struct inet_sock *inet = inet_sk(sk); 556 struct inet_sock *newinet; 557 struct sock *newsk = sk_alloc(sk->sk_net, PF_INET, GFP_KERNEL, 558 sk->sk_prot); 559 560 if (!newsk) 561 goto out; 562 563 sock_init_data(NULL, newsk); 564 565 newsk->sk_type = SOCK_STREAM; 566 567 newsk->sk_no_check = sk->sk_no_check; 568 newsk->sk_reuse = sk->sk_reuse; 569 newsk->sk_shutdown = sk->sk_shutdown; 570 571 newsk->sk_destruct = inet_sock_destruct; 572 newsk->sk_family = PF_INET; 573 newsk->sk_protocol = IPPROTO_SCTP; 574 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 575 sock_reset_flag(newsk, SOCK_ZAPPED); 576 577 newinet = inet_sk(newsk); 578 579 /* Initialize sk's sport, dport, rcv_saddr and daddr for 580 * getsockname() and getpeername() 581 */ 582 newinet->sport = inet->sport; 583 newinet->saddr = inet->saddr; 584 newinet->rcv_saddr = inet->rcv_saddr; 585 newinet->dport = htons(asoc->peer.port); 586 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 587 newinet->pmtudisc = inet->pmtudisc; 588 newinet->id = asoc->next_tsn ^ jiffies; 589 590 newinet->uc_ttl = -1; 591 newinet->mc_loop = 1; 592 newinet->mc_ttl = 1; 593 newinet->mc_index = 0; 594 newinet->mc_list = NULL; 595 596 sk_refcnt_debug_inc(newsk); 597 598 if (newsk->sk_prot->init(newsk)) { 599 sk_common_release(newsk); 600 newsk = NULL; 601 } 602 603 out: 604 return newsk; 605 } 606 607 /* Map address, empty for v4 family */ 608 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 609 { 610 /* Empty */ 611 } 612 613 /* Dump the v4 addr to the seq file. */ 614 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 615 { 616 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); 617 } 618 619 /* Event handler for inet address addition/deletion events. 620 * The sctp_local_addr_list needs to be protocted by a spin lock since 621 * multiple notifiers (say IPv4 and IPv6) may be running at the same 622 * time and thus corrupt the list. 623 * The reader side is protected with RCU. 624 */ 625 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 626 void *ptr) 627 { 628 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 629 struct sctp_sockaddr_entry *addr = NULL; 630 struct sctp_sockaddr_entry *temp; 631 int found = 0; 632 633 switch (ev) { 634 case NETDEV_UP: 635 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 636 if (addr) { 637 addr->a.v4.sin_family = AF_INET; 638 addr->a.v4.sin_port = 0; 639 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 640 addr->valid = 1; 641 spin_lock_bh(&sctp_local_addr_lock); 642 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 643 spin_unlock_bh(&sctp_local_addr_lock); 644 } 645 break; 646 case NETDEV_DOWN: 647 spin_lock_bh(&sctp_local_addr_lock); 648 list_for_each_entry_safe(addr, temp, 649 &sctp_local_addr_list, list) { 650 if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) { 651 found = 1; 652 addr->valid = 0; 653 list_del_rcu(&addr->list); 654 break; 655 } 656 } 657 spin_unlock_bh(&sctp_local_addr_lock); 658 if (found) 659 call_rcu(&addr->rcu, sctp_local_addr_free); 660 break; 661 } 662 663 return NOTIFY_DONE; 664 } 665 666 /* 667 * Initialize the control inode/socket with a control endpoint data 668 * structure. This endpoint is reserved exclusively for the OOTB processing. 669 */ 670 static int sctp_ctl_sock_init(void) 671 { 672 int err; 673 sa_family_t family; 674 675 if (sctp_get_pf_specific(PF_INET6)) 676 family = PF_INET6; 677 else 678 family = PF_INET; 679 680 err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP, 681 &sctp_ctl_socket); 682 if (err < 0) { 683 printk(KERN_ERR 684 "SCTP: Failed to create the SCTP control socket.\n"); 685 return err; 686 } 687 sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC; 688 inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1; 689 690 return 0; 691 } 692 693 /* Register address family specific functions. */ 694 int sctp_register_af(struct sctp_af *af) 695 { 696 switch (af->sa_family) { 697 case AF_INET: 698 if (sctp_af_v4_specific) 699 return 0; 700 sctp_af_v4_specific = af; 701 break; 702 case AF_INET6: 703 if (sctp_af_v6_specific) 704 return 0; 705 sctp_af_v6_specific = af; 706 break; 707 default: 708 return 0; 709 } 710 711 INIT_LIST_HEAD(&af->list); 712 list_add_tail(&af->list, &sctp_address_families); 713 return 1; 714 } 715 716 /* Get the table of functions for manipulating a particular address 717 * family. 718 */ 719 struct sctp_af *sctp_get_af_specific(sa_family_t family) 720 { 721 switch (family) { 722 case AF_INET: 723 return sctp_af_v4_specific; 724 case AF_INET6: 725 return sctp_af_v6_specific; 726 default: 727 return NULL; 728 } 729 } 730 731 /* Common code to initialize a AF_INET msg_name. */ 732 static void sctp_inet_msgname(char *msgname, int *addr_len) 733 { 734 struct sockaddr_in *sin; 735 736 sin = (struct sockaddr_in *)msgname; 737 *addr_len = sizeof(struct sockaddr_in); 738 sin->sin_family = AF_INET; 739 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 740 } 741 742 /* Copy the primary address of the peer primary address as the msg_name. */ 743 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 744 int *addr_len) 745 { 746 struct sockaddr_in *sin, *sinfrom; 747 748 if (msgname) { 749 struct sctp_association *asoc; 750 751 asoc = event->asoc; 752 sctp_inet_msgname(msgname, addr_len); 753 sin = (struct sockaddr_in *)msgname; 754 sinfrom = &asoc->peer.primary_addr.v4; 755 sin->sin_port = htons(asoc->peer.port); 756 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 757 } 758 } 759 760 /* Initialize and copy out a msgname from an inbound skb. */ 761 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 762 { 763 if (msgname) { 764 struct sctphdr *sh = sctp_hdr(skb); 765 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 766 767 sctp_inet_msgname(msgname, len); 768 sin->sin_port = sh->source; 769 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 770 } 771 } 772 773 /* Do we support this AF? */ 774 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 775 { 776 /* PF_INET only supports AF_INET addresses. */ 777 return (AF_INET == family); 778 } 779 780 /* Address matching with wildcards allowed. */ 781 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 782 const union sctp_addr *addr2, 783 struct sctp_sock *opt) 784 { 785 /* PF_INET only supports AF_INET addresses. */ 786 if (addr1->sa.sa_family != addr2->sa.sa_family) 787 return 0; 788 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 789 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 790 return 1; 791 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 792 return 1; 793 794 return 0; 795 } 796 797 /* Verify that provided sockaddr looks bindable. Common verification has 798 * already been taken care of. 799 */ 800 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 801 { 802 return sctp_v4_available(addr, opt); 803 } 804 805 /* Verify that sockaddr looks sendable. Common verification has already 806 * been taken care of. 807 */ 808 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 809 { 810 return 1; 811 } 812 813 /* Fill in Supported Address Type information for INIT and INIT-ACK 814 * chunks. Returns number of addresses supported. 815 */ 816 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 817 __be16 *types) 818 { 819 types[0] = SCTP_PARAM_IPV4_ADDRESS; 820 return 1; 821 } 822 823 /* Wrapper routine that calls the ip transmit routine. */ 824 static inline int sctp_v4_xmit(struct sk_buff *skb, 825 struct sctp_transport *transport, int ipfragok) 826 { 827 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 828 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", 829 __FUNCTION__, skb, skb->len, 830 NIPQUAD(((struct rtable *)skb->dst)->rt_src), 831 NIPQUAD(((struct rtable *)skb->dst)->rt_dst)); 832 833 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 834 return ip_queue_xmit(skb, ipfragok); 835 } 836 837 static struct sctp_af sctp_af_inet; 838 839 static struct sctp_pf sctp_pf_inet = { 840 .event_msgname = sctp_inet_event_msgname, 841 .skb_msgname = sctp_inet_skb_msgname, 842 .af_supported = sctp_inet_af_supported, 843 .cmp_addr = sctp_inet_cmp_addr, 844 .bind_verify = sctp_inet_bind_verify, 845 .send_verify = sctp_inet_send_verify, 846 .supported_addrs = sctp_inet_supported_addrs, 847 .create_accept_sk = sctp_v4_create_accept_sk, 848 .addr_v4map = sctp_v4_addr_v4map, 849 .af = &sctp_af_inet 850 }; 851 852 /* Notifier for inetaddr addition/deletion events. */ 853 static struct notifier_block sctp_inetaddr_notifier = { 854 .notifier_call = sctp_inetaddr_event, 855 }; 856 857 /* Socket operations. */ 858 static const struct proto_ops inet_seqpacket_ops = { 859 .family = PF_INET, 860 .owner = THIS_MODULE, 861 .release = inet_release, /* Needs to be wrapped... */ 862 .bind = inet_bind, 863 .connect = inet_dgram_connect, 864 .socketpair = sock_no_socketpair, 865 .accept = inet_accept, 866 .getname = inet_getname, /* Semantics are different. */ 867 .poll = sctp_poll, 868 .ioctl = inet_ioctl, 869 .listen = sctp_inet_listen, 870 .shutdown = inet_shutdown, /* Looks harmless. */ 871 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 872 .getsockopt = sock_common_getsockopt, 873 .sendmsg = inet_sendmsg, 874 .recvmsg = sock_common_recvmsg, 875 .mmap = sock_no_mmap, 876 .sendpage = sock_no_sendpage, 877 #ifdef CONFIG_COMPAT 878 .compat_setsockopt = compat_sock_common_setsockopt, 879 .compat_getsockopt = compat_sock_common_getsockopt, 880 #endif 881 }; 882 883 /* Registration with AF_INET family. */ 884 static struct inet_protosw sctp_seqpacket_protosw = { 885 .type = SOCK_SEQPACKET, 886 .protocol = IPPROTO_SCTP, 887 .prot = &sctp_prot, 888 .ops = &inet_seqpacket_ops, 889 .capability = -1, 890 .no_check = 0, 891 .flags = SCTP_PROTOSW_FLAG 892 }; 893 static struct inet_protosw sctp_stream_protosw = { 894 .type = SOCK_STREAM, 895 .protocol = IPPROTO_SCTP, 896 .prot = &sctp_prot, 897 .ops = &inet_seqpacket_ops, 898 .capability = -1, 899 .no_check = 0, 900 .flags = SCTP_PROTOSW_FLAG 901 }; 902 903 /* Register with IP layer. */ 904 static struct net_protocol sctp_protocol = { 905 .handler = sctp_rcv, 906 .err_handler = sctp_v4_err, 907 .no_policy = 1, 908 }; 909 910 /* IPv4 address related functions. */ 911 static struct sctp_af sctp_af_inet = { 912 .sa_family = AF_INET, 913 .sctp_xmit = sctp_v4_xmit, 914 .setsockopt = ip_setsockopt, 915 .getsockopt = ip_getsockopt, 916 .get_dst = sctp_v4_get_dst, 917 .get_saddr = sctp_v4_get_saddr, 918 .copy_addrlist = sctp_v4_copy_addrlist, 919 .from_skb = sctp_v4_from_skb, 920 .from_sk = sctp_v4_from_sk, 921 .to_sk_saddr = sctp_v4_to_sk_saddr, 922 .to_sk_daddr = sctp_v4_to_sk_daddr, 923 .from_addr_param = sctp_v4_from_addr_param, 924 .to_addr_param = sctp_v4_to_addr_param, 925 .dst_saddr = sctp_v4_dst_saddr, 926 .cmp_addr = sctp_v4_cmp_addr, 927 .addr_valid = sctp_v4_addr_valid, 928 .inaddr_any = sctp_v4_inaddr_any, 929 .is_any = sctp_v4_is_any, 930 .available = sctp_v4_available, 931 .scope = sctp_v4_scope, 932 .skb_iif = sctp_v4_skb_iif, 933 .is_ce = sctp_v4_is_ce, 934 .seq_dump_addr = sctp_v4_seq_dump_addr, 935 .net_header_len = sizeof(struct iphdr), 936 .sockaddr_len = sizeof(struct sockaddr_in), 937 #ifdef CONFIG_COMPAT 938 .compat_setsockopt = compat_ip_setsockopt, 939 .compat_getsockopt = compat_ip_getsockopt, 940 #endif 941 }; 942 943 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 944 945 switch (family) { 946 case PF_INET: 947 return sctp_pf_inet_specific; 948 case PF_INET6: 949 return sctp_pf_inet6_specific; 950 default: 951 return NULL; 952 } 953 } 954 955 /* Register the PF specific function table. */ 956 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 957 { 958 switch (family) { 959 case PF_INET: 960 if (sctp_pf_inet_specific) 961 return 0; 962 sctp_pf_inet_specific = pf; 963 break; 964 case PF_INET6: 965 if (sctp_pf_inet6_specific) 966 return 0; 967 sctp_pf_inet6_specific = pf; 968 break; 969 default: 970 return 0; 971 } 972 return 1; 973 } 974 975 static int __init init_sctp_mibs(void) 976 { 977 sctp_statistics[0] = alloc_percpu(struct sctp_mib); 978 if (!sctp_statistics[0]) 979 return -ENOMEM; 980 sctp_statistics[1] = alloc_percpu(struct sctp_mib); 981 if (!sctp_statistics[1]) { 982 free_percpu(sctp_statistics[0]); 983 return -ENOMEM; 984 } 985 return 0; 986 987 } 988 989 static void cleanup_sctp_mibs(void) 990 { 991 free_percpu(sctp_statistics[0]); 992 free_percpu(sctp_statistics[1]); 993 } 994 995 static void sctp_v4_pf_init(void) 996 { 997 /* Initialize the SCTP specific PF functions. */ 998 sctp_register_pf(&sctp_pf_inet, PF_INET); 999 sctp_register_af(&sctp_af_inet); 1000 } 1001 1002 static void sctp_v4_pf_exit(void) 1003 { 1004 list_del(&sctp_af_inet.list); 1005 } 1006 1007 static int sctp_v4_protosw_init(void) 1008 { 1009 int rc; 1010 1011 rc = proto_register(&sctp_prot, 1); 1012 if (rc) 1013 return rc; 1014 1015 /* Register SCTP(UDP and TCP style) with socket layer. */ 1016 inet_register_protosw(&sctp_seqpacket_protosw); 1017 inet_register_protosw(&sctp_stream_protosw); 1018 1019 return 0; 1020 } 1021 1022 static void sctp_v4_protosw_exit(void) 1023 { 1024 inet_unregister_protosw(&sctp_stream_protosw); 1025 inet_unregister_protosw(&sctp_seqpacket_protosw); 1026 proto_unregister(&sctp_prot); 1027 } 1028 1029 static int sctp_v4_add_protocol(void) 1030 { 1031 /* Register notifier for inet address additions/deletions. */ 1032 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1033 1034 /* Register SCTP with inet layer. */ 1035 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1036 return -EAGAIN; 1037 1038 return 0; 1039 } 1040 1041 static void sctp_v4_del_protocol(void) 1042 { 1043 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1044 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1045 } 1046 1047 /* Initialize the universe into something sensible. */ 1048 SCTP_STATIC __init int sctp_init(void) 1049 { 1050 int i; 1051 int status = -EINVAL; 1052 unsigned long goal; 1053 unsigned long limit; 1054 int max_share; 1055 int order; 1056 1057 /* SCTP_DEBUG sanity check. */ 1058 if (!sctp_sanity_check()) 1059 goto out; 1060 1061 /* Allocate bind_bucket and chunk caches. */ 1062 status = -ENOBUFS; 1063 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1064 sizeof(struct sctp_bind_bucket), 1065 0, SLAB_HWCACHE_ALIGN, 1066 NULL); 1067 if (!sctp_bucket_cachep) 1068 goto out; 1069 1070 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1071 sizeof(struct sctp_chunk), 1072 0, SLAB_HWCACHE_ALIGN, 1073 NULL); 1074 if (!sctp_chunk_cachep) 1075 goto err_chunk_cachep; 1076 1077 /* Allocate and initialise sctp mibs. */ 1078 status = init_sctp_mibs(); 1079 if (status) 1080 goto err_init_mibs; 1081 1082 /* Initialize proc fs directory. */ 1083 status = sctp_proc_init(); 1084 if (status) 1085 goto err_init_proc; 1086 1087 /* Initialize object count debugging. */ 1088 sctp_dbg_objcnt_init(); 1089 1090 /* 1091 * 14. Suggested SCTP Protocol Parameter Values 1092 */ 1093 /* The following protocol parameters are RECOMMENDED: */ 1094 /* RTO.Initial - 3 seconds */ 1095 sctp_rto_initial = SCTP_RTO_INITIAL; 1096 /* RTO.Min - 1 second */ 1097 sctp_rto_min = SCTP_RTO_MIN; 1098 /* RTO.Max - 60 seconds */ 1099 sctp_rto_max = SCTP_RTO_MAX; 1100 /* RTO.Alpha - 1/8 */ 1101 sctp_rto_alpha = SCTP_RTO_ALPHA; 1102 /* RTO.Beta - 1/4 */ 1103 sctp_rto_beta = SCTP_RTO_BETA; 1104 1105 /* Valid.Cookie.Life - 60 seconds */ 1106 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1107 1108 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1109 sctp_cookie_preserve_enable = 1; 1110 1111 /* Max.Burst - 4 */ 1112 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1113 1114 /* Association.Max.Retrans - 10 attempts 1115 * Path.Max.Retrans - 5 attempts (per destination address) 1116 * Max.Init.Retransmits - 8 attempts 1117 */ 1118 sctp_max_retrans_association = 10; 1119 sctp_max_retrans_path = 5; 1120 sctp_max_retrans_init = 8; 1121 1122 /* Sendbuffer growth - do per-socket accounting */ 1123 sctp_sndbuf_policy = 0; 1124 1125 /* Rcvbuffer growth - do per-socket accounting */ 1126 sctp_rcvbuf_policy = 0; 1127 1128 /* HB.interval - 30 seconds */ 1129 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1130 1131 /* delayed SACK timeout */ 1132 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1133 1134 /* Implementation specific variables. */ 1135 1136 /* Initialize default stream count setup information. */ 1137 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1138 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1139 1140 /* Initialize handle used for association ids. */ 1141 idr_init(&sctp_assocs_id); 1142 1143 /* Set the pressure threshold to be a fraction of global memory that 1144 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1145 * memory, with a floor of 128 pages. 1146 * Note this initalizes the data in sctpv6_prot too 1147 * Unabashedly stolen from tcp_init 1148 */ 1149 limit = min(num_physpages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1150 limit = (limit * (num_physpages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1151 limit = max(limit, 128UL); 1152 sysctl_sctp_mem[0] = limit / 4 * 3; 1153 sysctl_sctp_mem[1] = limit; 1154 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1155 1156 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1157 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1158 max_share = min(4UL*1024*1024, limit); 1159 1160 sysctl_sctp_rmem[0] = PAGE_SIZE; /* give each asoc 1 page min */ 1161 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1162 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1163 1164 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1165 sysctl_sctp_wmem[1] = 16*1024; 1166 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1167 1168 /* Size and allocate the association hash table. 1169 * The methodology is similar to that of the tcp hash tables. 1170 */ 1171 if (num_physpages >= (128 * 1024)) 1172 goal = num_physpages >> (22 - PAGE_SHIFT); 1173 else 1174 goal = num_physpages >> (24 - PAGE_SHIFT); 1175 1176 for (order = 0; (1UL << order) < goal; order++) 1177 ; 1178 1179 do { 1180 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1181 sizeof(struct sctp_hashbucket); 1182 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1183 continue; 1184 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1185 __get_free_pages(GFP_ATOMIC, order); 1186 } while (!sctp_assoc_hashtable && --order > 0); 1187 if (!sctp_assoc_hashtable) { 1188 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1189 status = -ENOMEM; 1190 goto err_ahash_alloc; 1191 } 1192 for (i = 0; i < sctp_assoc_hashsize; i++) { 1193 rwlock_init(&sctp_assoc_hashtable[i].lock); 1194 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1195 } 1196 1197 /* Allocate and initialize the endpoint hash table. */ 1198 sctp_ep_hashsize = 64; 1199 sctp_ep_hashtable = (struct sctp_hashbucket *) 1200 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1201 if (!sctp_ep_hashtable) { 1202 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1203 status = -ENOMEM; 1204 goto err_ehash_alloc; 1205 } 1206 for (i = 0; i < sctp_ep_hashsize; i++) { 1207 rwlock_init(&sctp_ep_hashtable[i].lock); 1208 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1209 } 1210 1211 /* Allocate and initialize the SCTP port hash table. */ 1212 do { 1213 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1214 sizeof(struct sctp_bind_hashbucket); 1215 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1216 continue; 1217 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1218 __get_free_pages(GFP_ATOMIC, order); 1219 } while (!sctp_port_hashtable && --order > 0); 1220 if (!sctp_port_hashtable) { 1221 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1222 status = -ENOMEM; 1223 goto err_bhash_alloc; 1224 } 1225 for (i = 0; i < sctp_port_hashsize; i++) { 1226 spin_lock_init(&sctp_port_hashtable[i].lock); 1227 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1228 } 1229 1230 printk(KERN_INFO "SCTP: Hash tables configured " 1231 "(established %d bind %d)\n", 1232 sctp_assoc_hashsize, sctp_port_hashsize); 1233 1234 /* Disable ADDIP by default. */ 1235 sctp_addip_enable = 0; 1236 sctp_addip_noauth = 0; 1237 1238 /* Enable PR-SCTP by default. */ 1239 sctp_prsctp_enable = 1; 1240 1241 /* Disable AUTH by default. */ 1242 sctp_auth_enable = 0; 1243 1244 sctp_sysctl_register(); 1245 1246 INIT_LIST_HEAD(&sctp_address_families); 1247 sctp_v4_pf_init(); 1248 sctp_v6_pf_init(); 1249 1250 /* Initialize the local address list. */ 1251 INIT_LIST_HEAD(&sctp_local_addr_list); 1252 spin_lock_init(&sctp_local_addr_lock); 1253 sctp_get_local_addr_list(); 1254 1255 status = sctp_v4_protosw_init(); 1256 1257 if (status) 1258 goto err_protosw_init; 1259 1260 status = sctp_v6_protosw_init(); 1261 if (status) 1262 goto err_v6_protosw_init; 1263 1264 /* Initialize the control inode/socket for handling OOTB packets. */ 1265 if ((status = sctp_ctl_sock_init())) { 1266 printk (KERN_ERR 1267 "SCTP: Failed to initialize the SCTP control sock.\n"); 1268 goto err_ctl_sock_init; 1269 } 1270 1271 status = sctp_v4_add_protocol(); 1272 if (status) 1273 goto err_add_protocol; 1274 1275 /* Register SCTP with inet6 layer. */ 1276 status = sctp_v6_add_protocol(); 1277 if (status) 1278 goto err_v6_add_protocol; 1279 1280 status = 0; 1281 out: 1282 return status; 1283 err_v6_add_protocol: 1284 sctp_v6_del_protocol(); 1285 err_add_protocol: 1286 sctp_v4_del_protocol(); 1287 sock_release(sctp_ctl_socket); 1288 err_ctl_sock_init: 1289 sctp_v6_protosw_exit(); 1290 err_v6_protosw_init: 1291 sctp_v4_protosw_exit(); 1292 err_protosw_init: 1293 sctp_free_local_addr_list(); 1294 sctp_v4_pf_exit(); 1295 sctp_v6_pf_exit(); 1296 sctp_sysctl_unregister(); 1297 list_del(&sctp_af_inet.list); 1298 free_pages((unsigned long)sctp_port_hashtable, 1299 get_order(sctp_port_hashsize * 1300 sizeof(struct sctp_bind_hashbucket))); 1301 err_bhash_alloc: 1302 kfree(sctp_ep_hashtable); 1303 err_ehash_alloc: 1304 free_pages((unsigned long)sctp_assoc_hashtable, 1305 get_order(sctp_assoc_hashsize * 1306 sizeof(struct sctp_hashbucket))); 1307 err_ahash_alloc: 1308 sctp_dbg_objcnt_exit(); 1309 sctp_proc_exit(); 1310 err_init_proc: 1311 cleanup_sctp_mibs(); 1312 err_init_mibs: 1313 kmem_cache_destroy(sctp_chunk_cachep); 1314 err_chunk_cachep: 1315 kmem_cache_destroy(sctp_bucket_cachep); 1316 goto out; 1317 } 1318 1319 /* Exit handler for the SCTP protocol. */ 1320 SCTP_STATIC __exit void sctp_exit(void) 1321 { 1322 /* BUG. This should probably do something useful like clean 1323 * up all the remaining associations and all that memory. 1324 */ 1325 1326 /* Unregister with inet6/inet layers. */ 1327 sctp_v6_del_protocol(); 1328 sctp_v4_del_protocol(); 1329 1330 /* Free the control endpoint. */ 1331 sock_release(sctp_ctl_socket); 1332 1333 /* Free protosw registrations */ 1334 sctp_v6_protosw_exit(); 1335 sctp_v4_protosw_exit(); 1336 1337 /* Free the local address list. */ 1338 sctp_free_local_addr_list(); 1339 1340 /* Unregister with socket layer. */ 1341 sctp_v6_pf_exit(); 1342 sctp_v4_pf_exit(); 1343 1344 sctp_sysctl_unregister(); 1345 list_del(&sctp_af_inet.list); 1346 1347 free_pages((unsigned long)sctp_assoc_hashtable, 1348 get_order(sctp_assoc_hashsize * 1349 sizeof(struct sctp_hashbucket))); 1350 kfree(sctp_ep_hashtable); 1351 free_pages((unsigned long)sctp_port_hashtable, 1352 get_order(sctp_port_hashsize * 1353 sizeof(struct sctp_bind_hashbucket))); 1354 1355 sctp_dbg_objcnt_exit(); 1356 sctp_proc_exit(); 1357 cleanup_sctp_mibs(); 1358 1359 kmem_cache_destroy(sctp_chunk_cachep); 1360 kmem_cache_destroy(sctp_bucket_cachep); 1361 } 1362 1363 module_init(sctp_init); 1364 module_exit(sctp_exit); 1365 1366 /* 1367 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1368 */ 1369 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1370 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1371 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1372 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1373 MODULE_LICENSE("GPL"); 1374