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 <linux/slab.h> 58#include <net/net_namespace.h> 59#include <net/protocol.h> 60#include <net/ip.h> 61#include <net/ipv6.h> 62#include <net/route.h> 63#include <net/sctp/sctp.h> 64#include <net/addrconf.h> 65#include <net/inet_common.h> 66#include <net/inet_ecn.h> 67 68/* Global data structures. */ 69struct sctp_globals sctp_globals __read_mostly; 70DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 71 72#ifdef CONFIG_PROC_FS 73struct proc_dir_entry *proc_net_sctp; 74#endif 75 76struct idr sctp_assocs_id; 77DEFINE_SPINLOCK(sctp_assocs_id_lock); 78 79/* This is the global socket data structure used for responding to 80 * the Out-of-the-blue (OOTB) packets. A control sock will be created 81 * for this socket at the initialization time. 82 */ 83static struct sock *sctp_ctl_sock; 84 85static struct sctp_pf *sctp_pf_inet6_specific; 86static struct sctp_pf *sctp_pf_inet_specific; 87static struct sctp_af *sctp_af_v4_specific; 88static struct sctp_af *sctp_af_v6_specific; 89 90struct kmem_cache *sctp_chunk_cachep __read_mostly; 91struct kmem_cache *sctp_bucket_cachep __read_mostly; 92 93int sysctl_sctp_mem[3]; 94int sysctl_sctp_rmem[3]; 95int sysctl_sctp_wmem[3]; 96 97/* Return the address of the control sock. */ 98struct sock *sctp_get_ctl_sock(void) 99{ 100 return sctp_ctl_sock; 101} 102 103/* Set up the proc fs entry for the SCTP protocol. */ 104static __init int sctp_proc_init(void) 105{ 106 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 107 goto out_nomem; 108#ifdef CONFIG_PROC_FS 109 if (!proc_net_sctp) { 110 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 111 if (!proc_net_sctp) 112 goto out_free_percpu; 113 } 114 115 if (sctp_snmp_proc_init()) 116 goto out_snmp_proc_init; 117 if (sctp_eps_proc_init()) 118 goto out_eps_proc_init; 119 if (sctp_assocs_proc_init()) 120 goto out_assocs_proc_init; 121 if (sctp_remaddr_proc_init()) 122 goto out_remaddr_proc_init; 123 124 return 0; 125 126out_remaddr_proc_init: 127 sctp_assocs_proc_exit(); 128out_assocs_proc_init: 129 sctp_eps_proc_exit(); 130out_eps_proc_init: 131 sctp_snmp_proc_exit(); 132out_snmp_proc_init: 133 if (proc_net_sctp) { 134 proc_net_sctp = NULL; 135 remove_proc_entry("sctp", init_net.proc_net); 136 } 137out_free_percpu: 138 percpu_counter_destroy(&sctp_sockets_allocated); 139#else 140 return 0; 141#endif /* CONFIG_PROC_FS */ 142 143out_nomem: 144 return -ENOMEM; 145} 146 147/* Clean up the proc fs entry for the SCTP protocol. 148 * Note: Do not make this __exit as it is used in the init error 149 * path. 150 */ 151static void sctp_proc_exit(void) 152{ 153#ifdef CONFIG_PROC_FS 154 sctp_snmp_proc_exit(); 155 sctp_eps_proc_exit(); 156 sctp_assocs_proc_exit(); 157 sctp_remaddr_proc_exit(); 158 159 if (proc_net_sctp) { 160 proc_net_sctp = NULL; 161 remove_proc_entry("sctp", init_net.proc_net); 162 } 163#endif 164 percpu_counter_destroy(&sctp_sockets_allocated); 165} 166 167/* Private helper to extract ipv4 address and stash them in 168 * the protocol structure. 169 */ 170static void sctp_v4_copy_addrlist(struct list_head *addrlist, 171 struct net_device *dev) 172{ 173 struct in_device *in_dev; 174 struct in_ifaddr *ifa; 175 struct sctp_sockaddr_entry *addr; 176 177 rcu_read_lock(); 178 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 179 rcu_read_unlock(); 180 return; 181 } 182 183 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 184 /* Add the address to the local list. */ 185 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 186 if (addr) { 187 addr->a.v4.sin_family = AF_INET; 188 addr->a.v4.sin_port = 0; 189 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 190 addr->valid = 1; 191 INIT_LIST_HEAD(&addr->list); 192 list_add_tail(&addr->list, addrlist); 193 } 194 } 195 196 rcu_read_unlock(); 197} 198 199/* Extract our IP addresses from the system and stash them in the 200 * protocol structure. 201 */ 202static void sctp_get_local_addr_list(void) 203{ 204 struct net_device *dev; 205 struct list_head *pos; 206 struct sctp_af *af; 207 208 rcu_read_lock(); 209 for_each_netdev_rcu(&init_net, dev) { 210 __list_for_each(pos, &sctp_address_families) { 211 af = list_entry(pos, struct sctp_af, list); 212 af->copy_addrlist(&sctp_local_addr_list, dev); 213 } 214 } 215 rcu_read_unlock(); 216} 217 218/* Free the existing local addresses. */ 219static void sctp_free_local_addr_list(void) 220{ 221 struct sctp_sockaddr_entry *addr; 222 struct list_head *pos, *temp; 223 224 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 225 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 226 list_del(pos); 227 kfree(addr); 228 } 229} 230 231void sctp_local_addr_free(struct rcu_head *head) 232{ 233 struct sctp_sockaddr_entry *e = container_of(head, 234 struct sctp_sockaddr_entry, rcu); 235 kfree(e); 236} 237 238/* Copy the local addresses which are valid for 'scope' into 'bp'. */ 239int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 240 gfp_t gfp, int copy_flags) 241{ 242 struct sctp_sockaddr_entry *addr; 243 int error = 0; 244 245 rcu_read_lock(); 246 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 247 if (!addr->valid) 248 continue; 249 if (sctp_in_scope(&addr->a, scope)) { 250 /* Now that the address is in scope, check to see if 251 * the address type is really supported by the local 252 * sock as well as the remote peer. 253 */ 254 if ((((AF_INET == addr->a.sa.sa_family) && 255 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 256 (((AF_INET6 == addr->a.sa.sa_family) && 257 (copy_flags & SCTP_ADDR6_ALLOWED) && 258 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 259 error = sctp_add_bind_addr(bp, &addr->a, 260 SCTP_ADDR_SRC, GFP_ATOMIC); 261 if (error) 262 goto end_copy; 263 } 264 } 265 } 266 267end_copy: 268 rcu_read_unlock(); 269 return error; 270} 271 272/* Initialize a sctp_addr from in incoming skb. */ 273static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 274 int is_saddr) 275{ 276 void *from; 277 __be16 *port; 278 struct sctphdr *sh; 279 280 port = &addr->v4.sin_port; 281 addr->v4.sin_family = AF_INET; 282 283 sh = sctp_hdr(skb); 284 if (is_saddr) { 285 *port = sh->source; 286 from = &ip_hdr(skb)->saddr; 287 } else { 288 *port = sh->dest; 289 from = &ip_hdr(skb)->daddr; 290 } 291 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 292} 293 294/* Initialize an sctp_addr from a socket. */ 295static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 296{ 297 addr->v4.sin_family = AF_INET; 298 addr->v4.sin_port = 0; 299 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 300} 301 302/* Initialize sk->sk_rcv_saddr from sctp_addr. */ 303static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 304{ 305 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 306} 307 308/* Initialize sk->sk_daddr from sctp_addr. */ 309static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 310{ 311 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 312} 313 314/* Initialize a sctp_addr from an address parameter. */ 315static void sctp_v4_from_addr_param(union sctp_addr *addr, 316 union sctp_addr_param *param, 317 __be16 port, int iif) 318{ 319 addr->v4.sin_family = AF_INET; 320 addr->v4.sin_port = port; 321 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 322} 323 324/* Initialize an address parameter from a sctp_addr and return the length 325 * of the address parameter. 326 */ 327static int sctp_v4_to_addr_param(const union sctp_addr *addr, 328 union sctp_addr_param *param) 329{ 330 int length = sizeof(sctp_ipv4addr_param_t); 331 332 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 333 param->v4.param_hdr.length = htons(length); 334 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 335 336 return length; 337} 338 339/* Initialize a sctp_addr from a dst_entry. */ 340static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 341 __be16 port) 342{ 343 struct rtable *rt = (struct rtable *)dst; 344 saddr->v4.sin_family = AF_INET; 345 saddr->v4.sin_port = port; 346 saddr->v4.sin_addr.s_addr = rt->rt_src; 347} 348 349/* Compare two addresses exactly. */ 350static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 351 const union sctp_addr *addr2) 352{ 353 if (addr1->sa.sa_family != addr2->sa.sa_family) 354 return 0; 355 if (addr1->v4.sin_port != addr2->v4.sin_port) 356 return 0; 357 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 358 return 0; 359 360 return 1; 361} 362 363/* Initialize addr struct to INADDR_ANY. */ 364static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 365{ 366 addr->v4.sin_family = AF_INET; 367 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 368 addr->v4.sin_port = port; 369} 370 371/* Is this a wildcard address? */ 372static int sctp_v4_is_any(const union sctp_addr *addr) 373{ 374 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 375} 376 377/* This function checks if the address is a valid address to be used for 378 * SCTP binding. 379 * 380 * Output: 381 * Return 0 - If the address is a non-unicast or an illegal address. 382 * Return 1 - If the address is a unicast. 383 */ 384static int sctp_v4_addr_valid(union sctp_addr *addr, 385 struct sctp_sock *sp, 386 const struct sk_buff *skb) 387{ 388 /* IPv4 addresses not allowed */ 389 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 390 return 0; 391 392 /* Is this a non-unicast address or a unusable SCTP address? */ 393 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 394 return 0; 395 396 /* Is this a broadcast address? */ 397 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 398 return 0; 399 400 return 1; 401} 402 403/* Should this be available for binding? */ 404static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 405{ 406 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 407 408 409 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 410 ret != RTN_LOCAL && 411 !sp->inet.freebind && 412 !sysctl_ip_nonlocal_bind) 413 return 0; 414 415 if (ipv6_only_sock(sctp_opt2sk(sp))) 416 return 0; 417 418 return 1; 419} 420 421/* Checking the loopback, private and other address scopes as defined in 422 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 423 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 424 * 425 * Level 0 - unusable SCTP addresses 426 * Level 1 - loopback address 427 * Level 2 - link-local addresses 428 * Level 3 - private addresses. 429 * Level 4 - global addresses 430 * For INIT and INIT-ACK address list, let L be the level of 431 * of requested destination address, sender and receiver 432 * SHOULD include all of its addresses with level greater 433 * than or equal to L. 434 * 435 * IPv4 scoping can be controlled through sysctl option 436 * net.sctp.addr_scope_policy 437 */ 438static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 439{ 440 sctp_scope_t retval; 441 442 /* Check for unusable SCTP addresses. */ 443 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 444 retval = SCTP_SCOPE_UNUSABLE; 445 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 446 retval = SCTP_SCOPE_LOOPBACK; 447 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 448 retval = SCTP_SCOPE_LINK; 449 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 450 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 451 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 452 retval = SCTP_SCOPE_PRIVATE; 453 } else { 454 retval = SCTP_SCOPE_GLOBAL; 455 } 456 457 return retval; 458} 459 460/* Returns a valid dst cache entry for the given source and destination ip 461 * addresses. If an association is passed, trys to get a dst entry with a 462 * source address that matches an address in the bind address list. 463 */ 464static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 465 union sctp_addr *daddr, 466 union sctp_addr *saddr) 467{ 468 struct rtable *rt; 469 struct flowi fl; 470 struct sctp_bind_addr *bp; 471 struct sctp_sockaddr_entry *laddr; 472 struct dst_entry *dst = NULL; 473 union sctp_addr dst_saddr; 474 475 memset(&fl, 0x0, sizeof(struct flowi)); 476 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 477 fl.fl_ip_dport = daddr->v4.sin_port; 478 fl.proto = IPPROTO_SCTP; 479 if (asoc) { 480 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 481 fl.oif = asoc->base.sk->sk_bound_dev_if; 482 fl.fl_ip_sport = htons(asoc->base.bind_addr.port); 483 } 484 if (saddr) { 485 fl.fl4_src = saddr->v4.sin_addr.s_addr; 486 fl.fl_ip_sport = saddr->v4.sin_port; 487 } 488 489 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 490 __func__, &fl.fl4_dst, &fl.fl4_src); 491 492 if (!ip_route_output_key(&init_net, &rt, &fl)) { 493 dst = &rt->dst; 494 } 495 496 /* If there is no association or if a source address is passed, no 497 * more validation is required. 498 */ 499 if (!asoc || saddr) 500 goto out; 501 502 bp = &asoc->base.bind_addr; 503 504 if (dst) { 505 /* Walk through the bind address list and look for a bind 506 * address that matches the source address of the returned dst. 507 */ 508 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 509 rcu_read_lock(); 510 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 511 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 512 continue; 513 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 514 goto out_unlock; 515 } 516 rcu_read_unlock(); 517 518 /* None of the bound addresses match the source address of the 519 * dst. So release it. 520 */ 521 dst_release(dst); 522 dst = NULL; 523 } 524 525 /* Walk through the bind address list and try to get a dst that 526 * matches a bind address as the source address. 527 */ 528 rcu_read_lock(); 529 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 530 if (!laddr->valid) 531 continue; 532 if ((laddr->state == SCTP_ADDR_SRC) && 533 (AF_INET == laddr->a.sa.sa_family)) { 534 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 535 fl.fl_ip_sport = laddr->a.v4.sin_port; 536 if (!ip_route_output_key(&init_net, &rt, &fl)) { 537 dst = &rt->dst; 538 goto out_unlock; 539 } 540 } 541 } 542 543out_unlock: 544 rcu_read_unlock(); 545out: 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 */ 558static 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? */ 577static int sctp_v4_skb_iif(const struct sk_buff *skb) 578{ 579 return skb_rtable(skb)->rt_iif; 580} 581 582/* Was this packet marked by Explicit Congestion Notification? */ 583static 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(). */ 589static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 590 struct sctp_association *asoc) 591{ 592 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 593 sk->sk_prot); 594 struct inet_sock *newinet; 595 596 if (!newsk) 597 goto out; 598 599 sock_init_data(NULL, newsk); 600 601 sctp_copy_sock(newsk, sk, asoc); 602 sock_reset_flag(newsk, SOCK_ZAPPED); 603 604 newinet = inet_sk(newsk); 605 606 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 607 608 sk_refcnt_debug_inc(newsk); 609 610 if (newsk->sk_prot->init(newsk)) { 611 sk_common_release(newsk); 612 newsk = NULL; 613 } 614 615out: 616 return newsk; 617} 618 619/* Map address, empty for v4 family */ 620static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 621{ 622 /* Empty */ 623} 624 625/* Dump the v4 addr to the seq file. */ 626static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 627{ 628 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 629} 630 631static void sctp_v4_ecn_capable(struct sock *sk) 632{ 633 INET_ECN_xmit(sk); 634} 635 636/* Event handler for inet address addition/deletion events. 637 * The sctp_local_addr_list needs to be protocted by a spin lock since 638 * multiple notifiers (say IPv4 and IPv6) may be running at the same 639 * time and thus corrupt the list. 640 * The reader side is protected with RCU. 641 */ 642static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 643 void *ptr) 644{ 645 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 646 struct sctp_sockaddr_entry *addr = NULL; 647 struct sctp_sockaddr_entry *temp; 648 int found = 0; 649 650 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 651 return NOTIFY_DONE; 652 653 switch (ev) { 654 case NETDEV_UP: 655 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 656 if (addr) { 657 addr->a.v4.sin_family = AF_INET; 658 addr->a.v4.sin_port = 0; 659 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 660 addr->valid = 1; 661 spin_lock_bh(&sctp_local_addr_lock); 662 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 663 spin_unlock_bh(&sctp_local_addr_lock); 664 } 665 break; 666 case NETDEV_DOWN: 667 spin_lock_bh(&sctp_local_addr_lock); 668 list_for_each_entry_safe(addr, temp, 669 &sctp_local_addr_list, list) { 670 if (addr->a.sa.sa_family == AF_INET && 671 addr->a.v4.sin_addr.s_addr == 672 ifa->ifa_local) { 673 found = 1; 674 addr->valid = 0; 675 list_del_rcu(&addr->list); 676 break; 677 } 678 } 679 spin_unlock_bh(&sctp_local_addr_lock); 680 if (found) 681 call_rcu(&addr->rcu, sctp_local_addr_free); 682 break; 683 } 684 685 return NOTIFY_DONE; 686} 687 688/* 689 * Initialize the control inode/socket with a control endpoint data 690 * structure. This endpoint is reserved exclusively for the OOTB processing. 691 */ 692static int sctp_ctl_sock_init(void) 693{ 694 int err; 695 sa_family_t family = PF_INET; 696 697 if (sctp_get_pf_specific(PF_INET6)) 698 family = PF_INET6; 699 700 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 701 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 702 703 /* If IPv6 socket could not be created, try the IPv4 socket */ 704 if (err < 0 && family == PF_INET6) 705 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 706 SOCK_SEQPACKET, IPPROTO_SCTP, 707 &init_net); 708 709 if (err < 0) { 710 printk(KERN_ERR 711 "SCTP: Failed to create the SCTP control socket.\n"); 712 return err; 713 } 714 return 0; 715} 716 717/* Register address family specific functions. */ 718int sctp_register_af(struct sctp_af *af) 719{ 720 switch (af->sa_family) { 721 case AF_INET: 722 if (sctp_af_v4_specific) 723 return 0; 724 sctp_af_v4_specific = af; 725 break; 726 case AF_INET6: 727 if (sctp_af_v6_specific) 728 return 0; 729 sctp_af_v6_specific = af; 730 break; 731 default: 732 return 0; 733 } 734 735 INIT_LIST_HEAD(&af->list); 736 list_add_tail(&af->list, &sctp_address_families); 737 return 1; 738} 739 740/* Get the table of functions for manipulating a particular address 741 * family. 742 */ 743struct sctp_af *sctp_get_af_specific(sa_family_t family) 744{ 745 switch (family) { 746 case AF_INET: 747 return sctp_af_v4_specific; 748 case AF_INET6: 749 return sctp_af_v6_specific; 750 default: 751 return NULL; 752 } 753} 754 755/* Common code to initialize a AF_INET msg_name. */ 756static void sctp_inet_msgname(char *msgname, int *addr_len) 757{ 758 struct sockaddr_in *sin; 759 760 sin = (struct sockaddr_in *)msgname; 761 *addr_len = sizeof(struct sockaddr_in); 762 sin->sin_family = AF_INET; 763 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 764} 765 766/* Copy the primary address of the peer primary address as the msg_name. */ 767static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 768 int *addr_len) 769{ 770 struct sockaddr_in *sin, *sinfrom; 771 772 if (msgname) { 773 struct sctp_association *asoc; 774 775 asoc = event->asoc; 776 sctp_inet_msgname(msgname, addr_len); 777 sin = (struct sockaddr_in *)msgname; 778 sinfrom = &asoc->peer.primary_addr.v4; 779 sin->sin_port = htons(asoc->peer.port); 780 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 781 } 782} 783 784/* Initialize and copy out a msgname from an inbound skb. */ 785static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 786{ 787 if (msgname) { 788 struct sctphdr *sh = sctp_hdr(skb); 789 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 790 791 sctp_inet_msgname(msgname, len); 792 sin->sin_port = sh->source; 793 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 794 } 795} 796 797/* Do we support this AF? */ 798static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 799{ 800 /* PF_INET only supports AF_INET addresses. */ 801 return (AF_INET == family); 802} 803 804/* Address matching with wildcards allowed. */ 805static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 806 const union sctp_addr *addr2, 807 struct sctp_sock *opt) 808{ 809 /* PF_INET only supports AF_INET addresses. */ 810 if (addr1->sa.sa_family != addr2->sa.sa_family) 811 return 0; 812 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 813 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 814 return 1; 815 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 816 return 1; 817 818 return 0; 819} 820 821/* Verify that provided sockaddr looks bindable. Common verification has 822 * already been taken care of. 823 */ 824static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 825{ 826 return sctp_v4_available(addr, opt); 827} 828 829/* Verify that sockaddr looks sendable. Common verification has already 830 * been taken care of. 831 */ 832static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 833{ 834 return 1; 835} 836 837/* Fill in Supported Address Type information for INIT and INIT-ACK 838 * chunks. Returns number of addresses supported. 839 */ 840static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 841 __be16 *types) 842{ 843 types[0] = SCTP_PARAM_IPV4_ADDRESS; 844 return 1; 845} 846 847/* Wrapper routine that calls the ip transmit routine. */ 848static inline int sctp_v4_xmit(struct sk_buff *skb, 849 struct sctp_transport *transport) 850{ 851 struct inet_sock *inet = inet_sk(skb->sk); 852 853 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 854 __func__, skb, skb->len, 855 &skb_rtable(skb)->rt_src, 856 &skb_rtable(skb)->rt_dst); 857 858 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 859 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 860 861 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 862 return ip_queue_xmit(skb); 863} 864 865static struct sctp_af sctp_af_inet; 866 867static struct sctp_pf sctp_pf_inet = { 868 .event_msgname = sctp_inet_event_msgname, 869 .skb_msgname = sctp_inet_skb_msgname, 870 .af_supported = sctp_inet_af_supported, 871 .cmp_addr = sctp_inet_cmp_addr, 872 .bind_verify = sctp_inet_bind_verify, 873 .send_verify = sctp_inet_send_verify, 874 .supported_addrs = sctp_inet_supported_addrs, 875 .create_accept_sk = sctp_v4_create_accept_sk, 876 .addr_v4map = sctp_v4_addr_v4map, 877 .af = &sctp_af_inet 878}; 879 880/* Notifier for inetaddr addition/deletion events. */ 881static struct notifier_block sctp_inetaddr_notifier = { 882 .notifier_call = sctp_inetaddr_event, 883}; 884 885/* Socket operations. */ 886static const struct proto_ops inet_seqpacket_ops = { 887 .family = PF_INET, 888 .owner = THIS_MODULE, 889 .release = inet_release, /* Needs to be wrapped... */ 890 .bind = inet_bind, 891 .connect = inet_dgram_connect, 892 .socketpair = sock_no_socketpair, 893 .accept = inet_accept, 894 .getname = inet_getname, /* Semantics are different. */ 895 .poll = sctp_poll, 896 .ioctl = inet_ioctl, 897 .listen = sctp_inet_listen, 898 .shutdown = inet_shutdown, /* Looks harmless. */ 899 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 900 .getsockopt = sock_common_getsockopt, 901 .sendmsg = inet_sendmsg, 902 .recvmsg = sock_common_recvmsg, 903 .mmap = sock_no_mmap, 904 .sendpage = sock_no_sendpage, 905#ifdef CONFIG_COMPAT 906 .compat_setsockopt = compat_sock_common_setsockopt, 907 .compat_getsockopt = compat_sock_common_getsockopt, 908#endif 909}; 910 911/* Registration with AF_INET family. */ 912static struct inet_protosw sctp_seqpacket_protosw = { 913 .type = SOCK_SEQPACKET, 914 .protocol = IPPROTO_SCTP, 915 .prot = &sctp_prot, 916 .ops = &inet_seqpacket_ops, 917 .no_check = 0, 918 .flags = SCTP_PROTOSW_FLAG 919}; 920static struct inet_protosw sctp_stream_protosw = { 921 .type = SOCK_STREAM, 922 .protocol = IPPROTO_SCTP, 923 .prot = &sctp_prot, 924 .ops = &inet_seqpacket_ops, 925 .no_check = 0, 926 .flags = SCTP_PROTOSW_FLAG 927}; 928 929/* Register with IP layer. */ 930static const struct net_protocol sctp_protocol = { 931 .handler = sctp_rcv, 932 .err_handler = sctp_v4_err, 933 .no_policy = 1, 934}; 935 936/* IPv4 address related functions. */ 937static struct sctp_af sctp_af_inet = { 938 .sa_family = AF_INET, 939 .sctp_xmit = sctp_v4_xmit, 940 .setsockopt = ip_setsockopt, 941 .getsockopt = ip_getsockopt, 942 .get_dst = sctp_v4_get_dst, 943 .get_saddr = sctp_v4_get_saddr, 944 .copy_addrlist = sctp_v4_copy_addrlist, 945 .from_skb = sctp_v4_from_skb, 946 .from_sk = sctp_v4_from_sk, 947 .to_sk_saddr = sctp_v4_to_sk_saddr, 948 .to_sk_daddr = sctp_v4_to_sk_daddr, 949 .from_addr_param = sctp_v4_from_addr_param, 950 .to_addr_param = sctp_v4_to_addr_param, 951 .dst_saddr = sctp_v4_dst_saddr, 952 .cmp_addr = sctp_v4_cmp_addr, 953 .addr_valid = sctp_v4_addr_valid, 954 .inaddr_any = sctp_v4_inaddr_any, 955 .is_any = sctp_v4_is_any, 956 .available = sctp_v4_available, 957 .scope = sctp_v4_scope, 958 .skb_iif = sctp_v4_skb_iif, 959 .is_ce = sctp_v4_is_ce, 960 .seq_dump_addr = sctp_v4_seq_dump_addr, 961 .ecn_capable = sctp_v4_ecn_capable, 962 .net_header_len = sizeof(struct iphdr), 963 .sockaddr_len = sizeof(struct sockaddr_in), 964#ifdef CONFIG_COMPAT 965 .compat_setsockopt = compat_ip_setsockopt, 966 .compat_getsockopt = compat_ip_getsockopt, 967#endif 968}; 969 970struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 971 972 switch (family) { 973 case PF_INET: 974 return sctp_pf_inet_specific; 975 case PF_INET6: 976 return sctp_pf_inet6_specific; 977 default: 978 return NULL; 979 } 980} 981 982/* Register the PF specific function table. */ 983int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 984{ 985 switch (family) { 986 case PF_INET: 987 if (sctp_pf_inet_specific) 988 return 0; 989 sctp_pf_inet_specific = pf; 990 break; 991 case PF_INET6: 992 if (sctp_pf_inet6_specific) 993 return 0; 994 sctp_pf_inet6_specific = pf; 995 break; 996 default: 997 return 0; 998 } 999 return 1; 1000} 1001 1002static inline int init_sctp_mibs(void) 1003{ 1004 return snmp_mib_init((void __percpu **)sctp_statistics, 1005 sizeof(struct sctp_mib), 1006 __alignof__(struct sctp_mib)); 1007} 1008 1009static inline void cleanup_sctp_mibs(void) 1010{ 1011 snmp_mib_free((void __percpu **)sctp_statistics); 1012} 1013 1014static void sctp_v4_pf_init(void) 1015{ 1016 /* Initialize the SCTP specific PF functions. */ 1017 sctp_register_pf(&sctp_pf_inet, PF_INET); 1018 sctp_register_af(&sctp_af_inet); 1019} 1020 1021static void sctp_v4_pf_exit(void) 1022{ 1023 list_del(&sctp_af_inet.list); 1024} 1025 1026static int sctp_v4_protosw_init(void) 1027{ 1028 int rc; 1029 1030 rc = proto_register(&sctp_prot, 1); 1031 if (rc) 1032 return rc; 1033 1034 /* Register SCTP(UDP and TCP style) with socket layer. */ 1035 inet_register_protosw(&sctp_seqpacket_protosw); 1036 inet_register_protosw(&sctp_stream_protosw); 1037 1038 return 0; 1039} 1040 1041static void sctp_v4_protosw_exit(void) 1042{ 1043 inet_unregister_protosw(&sctp_stream_protosw); 1044 inet_unregister_protosw(&sctp_seqpacket_protosw); 1045 proto_unregister(&sctp_prot); 1046} 1047 1048static int sctp_v4_add_protocol(void) 1049{ 1050 /* Register notifier for inet address additions/deletions. */ 1051 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1052 1053 /* Register SCTP with inet layer. */ 1054 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1055 return -EAGAIN; 1056 1057 return 0; 1058} 1059 1060static void sctp_v4_del_protocol(void) 1061{ 1062 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1063 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1064} 1065 1066/* Initialize the universe into something sensible. */ 1067SCTP_STATIC __init int sctp_init(void) 1068{ 1069 int i; 1070 int status = -EINVAL; 1071 unsigned long goal; 1072 unsigned long limit; 1073 unsigned long nr_pages; 1074 int max_share; 1075 int order; 1076 1077 /* SCTP_DEBUG sanity check. */ 1078 if (!sctp_sanity_check()) 1079 goto out; 1080 1081 /* Allocate bind_bucket and chunk caches. */ 1082 status = -ENOBUFS; 1083 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1084 sizeof(struct sctp_bind_bucket), 1085 0, SLAB_HWCACHE_ALIGN, 1086 NULL); 1087 if (!sctp_bucket_cachep) 1088 goto out; 1089 1090 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1091 sizeof(struct sctp_chunk), 1092 0, SLAB_HWCACHE_ALIGN, 1093 NULL); 1094 if (!sctp_chunk_cachep) 1095 goto err_chunk_cachep; 1096 1097 /* Allocate and initialise sctp mibs. */ 1098 status = init_sctp_mibs(); 1099 if (status) 1100 goto err_init_mibs; 1101 1102 /* Initialize proc fs directory. */ 1103 status = sctp_proc_init(); 1104 if (status) 1105 goto err_init_proc; 1106 1107 /* Initialize object count debugging. */ 1108 sctp_dbg_objcnt_init(); 1109 1110 /* 1111 * 14. Suggested SCTP Protocol Parameter Values 1112 */ 1113 /* The following protocol parameters are RECOMMENDED: */ 1114 /* RTO.Initial - 3 seconds */ 1115 sctp_rto_initial = SCTP_RTO_INITIAL; 1116 /* RTO.Min - 1 second */ 1117 sctp_rto_min = SCTP_RTO_MIN; 1118 /* RTO.Max - 60 seconds */ 1119 sctp_rto_max = SCTP_RTO_MAX; 1120 /* RTO.Alpha - 1/8 */ 1121 sctp_rto_alpha = SCTP_RTO_ALPHA; 1122 /* RTO.Beta - 1/4 */ 1123 sctp_rto_beta = SCTP_RTO_BETA; 1124 1125 /* Valid.Cookie.Life - 60 seconds */ 1126 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1127 1128 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1129 sctp_cookie_preserve_enable = 1; 1130 1131 /* Max.Burst - 4 */ 1132 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1133 1134 /* Association.Max.Retrans - 10 attempts 1135 * Path.Max.Retrans - 5 attempts (per destination address) 1136 * Max.Init.Retransmits - 8 attempts 1137 */ 1138 sctp_max_retrans_association = 10; 1139 sctp_max_retrans_path = 5; 1140 sctp_max_retrans_init = 8; 1141 1142 /* Sendbuffer growth - do per-socket accounting */ 1143 sctp_sndbuf_policy = 0; 1144 1145 /* Rcvbuffer growth - do per-socket accounting */ 1146 sctp_rcvbuf_policy = 0; 1147 1148 /* HB.interval - 30 seconds */ 1149 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1150 1151 /* delayed SACK timeout */ 1152 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1153 1154 /* Implementation specific variables. */ 1155 1156 /* Initialize default stream count setup information. */ 1157 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1158 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1159 1160 /* Initialize handle used for association ids. */ 1161 idr_init(&sctp_assocs_id); 1162 1163 /* Set the pressure threshold to be a fraction of global memory that 1164 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1165 * memory, with a floor of 128 pages. 1166 * Note this initializes the data in sctpv6_prot too 1167 * Unabashedly stolen from tcp_init 1168 */ 1169 nr_pages = totalram_pages - totalhigh_pages; 1170 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1171 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1172 limit = max(limit, 128UL); 1173 sysctl_sctp_mem[0] = limit / 4 * 3; 1174 sysctl_sctp_mem[1] = limit; 1175 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1176 1177 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1178 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1179 max_share = min(4UL*1024*1024, limit); 1180 1181 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1182 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1183 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1184 1185 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1186 sysctl_sctp_wmem[1] = 16*1024; 1187 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1188 1189 /* Size and allocate the association hash table. 1190 * The methodology is similar to that of the tcp hash tables. 1191 */ 1192 if (totalram_pages >= (128 * 1024)) 1193 goal = totalram_pages >> (22 - PAGE_SHIFT); 1194 else 1195 goal = totalram_pages >> (24 - PAGE_SHIFT); 1196 1197 for (order = 0; (1UL << order) < goal; order++) 1198 ; 1199 1200 do { 1201 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1202 sizeof(struct sctp_hashbucket); 1203 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1204 continue; 1205 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1206 __get_free_pages(GFP_ATOMIC, order); 1207 } while (!sctp_assoc_hashtable && --order > 0); 1208 if (!sctp_assoc_hashtable) { 1209 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1210 status = -ENOMEM; 1211 goto err_ahash_alloc; 1212 } 1213 for (i = 0; i < sctp_assoc_hashsize; i++) { 1214 rwlock_init(&sctp_assoc_hashtable[i].lock); 1215 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1216 } 1217 1218 /* Allocate and initialize the endpoint hash table. */ 1219 sctp_ep_hashsize = 64; 1220 sctp_ep_hashtable = (struct sctp_hashbucket *) 1221 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1222 if (!sctp_ep_hashtable) { 1223 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1224 status = -ENOMEM; 1225 goto err_ehash_alloc; 1226 } 1227 for (i = 0; i < sctp_ep_hashsize; i++) { 1228 rwlock_init(&sctp_ep_hashtable[i].lock); 1229 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1230 } 1231 1232 /* Allocate and initialize the SCTP port hash table. */ 1233 do { 1234 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1235 sizeof(struct sctp_bind_hashbucket); 1236 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1237 continue; 1238 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1239 __get_free_pages(GFP_ATOMIC, order); 1240 } while (!sctp_port_hashtable && --order > 0); 1241 if (!sctp_port_hashtable) { 1242 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1243 status = -ENOMEM; 1244 goto err_bhash_alloc; 1245 } 1246 for (i = 0; i < sctp_port_hashsize; i++) { 1247 spin_lock_init(&sctp_port_hashtable[i].lock); 1248 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1249 } 1250 1251 printk(KERN_INFO "SCTP: Hash tables configured " 1252 "(established %d bind %d)\n", 1253 sctp_assoc_hashsize, sctp_port_hashsize); 1254 1255 /* Disable ADDIP by default. */ 1256 sctp_addip_enable = 0; 1257 sctp_addip_noauth = 0; 1258 1259 /* Enable PR-SCTP by default. */ 1260 sctp_prsctp_enable = 1; 1261 1262 /* Disable AUTH by default. */ 1263 sctp_auth_enable = 0; 1264 1265 /* Set SCOPE policy to enabled */ 1266 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1267 1268 /* Set the default rwnd update threshold */ 1269 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1270 1271 sctp_sysctl_register(); 1272 1273 INIT_LIST_HEAD(&sctp_address_families); 1274 sctp_v4_pf_init(); 1275 sctp_v6_pf_init(); 1276 1277 /* Initialize the local address list. */ 1278 INIT_LIST_HEAD(&sctp_local_addr_list); 1279 spin_lock_init(&sctp_local_addr_lock); 1280 sctp_get_local_addr_list(); 1281 1282 status = sctp_v4_protosw_init(); 1283 1284 if (status) 1285 goto err_protosw_init; 1286 1287 status = sctp_v6_protosw_init(); 1288 if (status) 1289 goto err_v6_protosw_init; 1290 1291 /* Initialize the control inode/socket for handling OOTB packets. */ 1292 if ((status = sctp_ctl_sock_init())) { 1293 printk (KERN_ERR 1294 "SCTP: Failed to initialize the SCTP control sock.\n"); 1295 goto err_ctl_sock_init; 1296 } 1297 1298 status = sctp_v4_add_protocol(); 1299 if (status) 1300 goto err_add_protocol; 1301 1302 /* Register SCTP with inet6 layer. */ 1303 status = sctp_v6_add_protocol(); 1304 if (status) 1305 goto err_v6_add_protocol; 1306 1307 status = 0; 1308out: 1309 return status; 1310err_v6_add_protocol: 1311 sctp_v4_del_protocol(); 1312err_add_protocol: 1313 inet_ctl_sock_destroy(sctp_ctl_sock); 1314err_ctl_sock_init: 1315 sctp_v6_protosw_exit(); 1316err_v6_protosw_init: 1317 sctp_v4_protosw_exit(); 1318err_protosw_init: 1319 sctp_free_local_addr_list(); 1320 sctp_v4_pf_exit(); 1321 sctp_v6_pf_exit(); 1322 sctp_sysctl_unregister(); 1323 free_pages((unsigned long)sctp_port_hashtable, 1324 get_order(sctp_port_hashsize * 1325 sizeof(struct sctp_bind_hashbucket))); 1326err_bhash_alloc: 1327 kfree(sctp_ep_hashtable); 1328err_ehash_alloc: 1329 free_pages((unsigned long)sctp_assoc_hashtable, 1330 get_order(sctp_assoc_hashsize * 1331 sizeof(struct sctp_hashbucket))); 1332err_ahash_alloc: 1333 sctp_dbg_objcnt_exit(); 1334 sctp_proc_exit(); 1335err_init_proc: 1336 cleanup_sctp_mibs(); 1337err_init_mibs: 1338 kmem_cache_destroy(sctp_chunk_cachep); 1339err_chunk_cachep: 1340 kmem_cache_destroy(sctp_bucket_cachep); 1341 goto out; 1342} 1343 1344/* Exit handler for the SCTP protocol. */ 1345SCTP_STATIC __exit void sctp_exit(void) 1346{ 1347 /* BUG. This should probably do something useful like clean 1348 * up all the remaining associations and all that memory. 1349 */ 1350 1351 /* Unregister with inet6/inet layers. */ 1352 sctp_v6_del_protocol(); 1353 sctp_v4_del_protocol(); 1354 1355 /* Free the control endpoint. */ 1356 inet_ctl_sock_destroy(sctp_ctl_sock); 1357 1358 /* Free protosw registrations */ 1359 sctp_v6_protosw_exit(); 1360 sctp_v4_protosw_exit(); 1361 1362 /* Free the local address list. */ 1363 sctp_free_local_addr_list(); 1364 1365 /* Unregister with socket layer. */ 1366 sctp_v6_pf_exit(); 1367 sctp_v4_pf_exit(); 1368 1369 sctp_sysctl_unregister(); 1370 1371 free_pages((unsigned long)sctp_assoc_hashtable, 1372 get_order(sctp_assoc_hashsize * 1373 sizeof(struct sctp_hashbucket))); 1374 kfree(sctp_ep_hashtable); 1375 free_pages((unsigned long)sctp_port_hashtable, 1376 get_order(sctp_port_hashsize * 1377 sizeof(struct sctp_bind_hashbucket))); 1378 1379 sctp_dbg_objcnt_exit(); 1380 sctp_proc_exit(); 1381 cleanup_sctp_mibs(); 1382 1383 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1384 1385 kmem_cache_destroy(sctp_chunk_cachep); 1386 kmem_cache_destroy(sctp_bucket_cachep); 1387} 1388 1389module_init(sctp_init); 1390module_exit(sctp_exit); 1391 1392/* 1393 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1394 */ 1395MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1396MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1397MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1398MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1399module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1400MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1401MODULE_LICENSE("GPL"); 1402