1 /* SCTP kernel implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001 Intel Corp. 6 * Copyright (c) 2001 Nokia, Inc. 7 * Copyright (c) 2001 La Monte H.P. Yarroll 8 * 9 * This file is part of the SCTP kernel implementation 10 * 11 * Initialization/cleanup for SCTP protocol support. 12 * 13 * This SCTP implementation is free software; 14 * you can redistribute it and/or modify it under the terms of 15 * the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This SCTP implementation is distributed in the hope that it 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 21 * ************************ 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 23 * See the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with GNU CC; see the file COPYING. If not, write to 27 * the Free Software Foundation, 59 Temple Place - Suite 330, 28 * Boston, MA 02111-1307, USA. 29 * 30 * Please send any bug reports or fixes you make to the 31 * email address(es): 32 * lksctp developers <lksctp-developers@lists.sourceforge.net> 33 * 34 * Or submit a bug report through the following website: 35 * http://www.sf.net/projects/lksctp 36 * 37 * Written or modified by: 38 * La Monte H.P. Yarroll <piggy@acm.org> 39 * Karl Knutson <karl@athena.chicago.il.us> 40 * Jon Grimm <jgrimm@us.ibm.com> 41 * Sridhar Samudrala <sri@us.ibm.com> 42 * Daisy Chang <daisyc@us.ibm.com> 43 * Ardelle Fan <ardelle.fan@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #include <linux/module.h> 50 #include <linux/init.h> 51 #include <linux/netdevice.h> 52 #include <linux/inetdevice.h> 53 #include <linux/seq_file.h> 54 #include <linux/bootmem.h> 55 #include <linux/highmem.h> 56 #include <linux/swap.h> 57 #include <net/net_namespace.h> 58 #include <net/protocol.h> 59 #include <net/ip.h> 60 #include <net/ipv6.h> 61 #include <net/route.h> 62 #include <net/sctp/sctp.h> 63 #include <net/addrconf.h> 64 #include <net/inet_common.h> 65 #include <net/inet_ecn.h> 66 67 /* Global data structures. */ 68 struct sctp_globals sctp_globals __read_mostly; 69 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 70 71 #ifdef CONFIG_PROC_FS 72 struct proc_dir_entry *proc_net_sctp; 73 #endif 74 75 struct idr sctp_assocs_id; 76 DEFINE_SPINLOCK(sctp_assocs_id_lock); 77 78 /* This is the global socket data structure used for responding to 79 * the Out-of-the-blue (OOTB) packets. A control sock will be created 80 * for this socket at the initialization time. 81 */ 82 static struct sock *sctp_ctl_sock; 83 84 static struct sctp_pf *sctp_pf_inet6_specific; 85 static struct sctp_pf *sctp_pf_inet_specific; 86 static struct sctp_af *sctp_af_v4_specific; 87 static struct sctp_af *sctp_af_v6_specific; 88 89 struct kmem_cache *sctp_chunk_cachep __read_mostly; 90 struct kmem_cache *sctp_bucket_cachep __read_mostly; 91 92 int sysctl_sctp_mem[3]; 93 int sysctl_sctp_rmem[3]; 94 int sysctl_sctp_wmem[3]; 95 96 /* Return the address of the control sock. */ 97 struct sock *sctp_get_ctl_sock(void) 98 { 99 return sctp_ctl_sock; 100 } 101 102 /* Set up the proc fs entry for the SCTP protocol. */ 103 static __init int sctp_proc_init(void) 104 { 105 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 106 goto out_nomem; 107 #ifdef CONFIG_PROC_FS 108 if (!proc_net_sctp) { 109 struct proc_dir_entry *ent; 110 ent = proc_mkdir("sctp", init_net.proc_net); 111 if (ent) { 112 ent->owner = THIS_MODULE; 113 proc_net_sctp = ent; 114 } else 115 goto out_free_percpu; 116 } 117 118 if (sctp_snmp_proc_init()) 119 goto out_snmp_proc_init; 120 if (sctp_eps_proc_init()) 121 goto out_eps_proc_init; 122 if (sctp_assocs_proc_init()) 123 goto out_assocs_proc_init; 124 if (sctp_remaddr_proc_init()) 125 goto out_remaddr_proc_init; 126 127 return 0; 128 129 out_remaddr_proc_init: 130 sctp_assocs_proc_exit(); 131 out_assocs_proc_init: 132 sctp_eps_proc_exit(); 133 out_eps_proc_init: 134 sctp_snmp_proc_exit(); 135 out_snmp_proc_init: 136 if (proc_net_sctp) { 137 proc_net_sctp = NULL; 138 remove_proc_entry("sctp", init_net.proc_net); 139 } 140 out_free_percpu: 141 percpu_counter_destroy(&sctp_sockets_allocated); 142 #else 143 return 0; 144 #endif /* CONFIG_PROC_FS */ 145 146 out_nomem: 147 return -ENOMEM; 148 } 149 150 /* Clean up the proc fs entry for the SCTP protocol. 151 * Note: Do not make this __exit as it is used in the init error 152 * path. 153 */ 154 static void sctp_proc_exit(void) 155 { 156 #ifdef CONFIG_PROC_FS 157 sctp_snmp_proc_exit(); 158 sctp_eps_proc_exit(); 159 sctp_assocs_proc_exit(); 160 sctp_remaddr_proc_exit(); 161 162 if (proc_net_sctp) { 163 proc_net_sctp = NULL; 164 remove_proc_entry("sctp", init_net.proc_net); 165 } 166 #endif 167 } 168 169 /* Private helper to extract ipv4 address and stash them in 170 * the protocol structure. 171 */ 172 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 173 struct net_device *dev) 174 { 175 struct in_device *in_dev; 176 struct in_ifaddr *ifa; 177 struct sctp_sockaddr_entry *addr; 178 179 rcu_read_lock(); 180 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 181 rcu_read_unlock(); 182 return; 183 } 184 185 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 186 /* Add the address to the local list. */ 187 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 188 if (addr) { 189 addr->a.v4.sin_family = AF_INET; 190 addr->a.v4.sin_port = 0; 191 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 192 addr->valid = 1; 193 INIT_LIST_HEAD(&addr->list); 194 INIT_RCU_HEAD(&addr->rcu); 195 list_add_tail(&addr->list, addrlist); 196 } 197 } 198 199 rcu_read_unlock(); 200 } 201 202 /* Extract our IP addresses from the system and stash them in the 203 * protocol structure. 204 */ 205 static void sctp_get_local_addr_list(void) 206 { 207 struct net_device *dev; 208 struct list_head *pos; 209 struct sctp_af *af; 210 211 read_lock(&dev_base_lock); 212 for_each_netdev(&init_net, dev) { 213 __list_for_each(pos, &sctp_address_families) { 214 af = list_entry(pos, struct sctp_af, list); 215 af->copy_addrlist(&sctp_local_addr_list, dev); 216 } 217 } 218 read_unlock(&dev_base_lock); 219 } 220 221 /* Free the existing local addresses. */ 222 static void sctp_free_local_addr_list(void) 223 { 224 struct sctp_sockaddr_entry *addr; 225 struct list_head *pos, *temp; 226 227 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 228 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 229 list_del(pos); 230 kfree(addr); 231 } 232 } 233 234 void sctp_local_addr_free(struct rcu_head *head) 235 { 236 struct sctp_sockaddr_entry *e = container_of(head, 237 struct sctp_sockaddr_entry, rcu); 238 kfree(e); 239 } 240 241 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 242 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 243 gfp_t gfp, int copy_flags) 244 { 245 struct sctp_sockaddr_entry *addr; 246 int error = 0; 247 248 rcu_read_lock(); 249 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 250 if (!addr->valid) 251 continue; 252 if (sctp_in_scope(&addr->a, scope)) { 253 /* Now that the address is in scope, check to see if 254 * the address type is really supported by the local 255 * sock as well as the remote peer. 256 */ 257 if ((((AF_INET == addr->a.sa.sa_family) && 258 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 259 (((AF_INET6 == addr->a.sa.sa_family) && 260 (copy_flags & SCTP_ADDR6_ALLOWED) && 261 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 262 error = sctp_add_bind_addr(bp, &addr->a, 263 SCTP_ADDR_SRC, GFP_ATOMIC); 264 if (error) 265 goto end_copy; 266 } 267 } 268 } 269 270 end_copy: 271 rcu_read_unlock(); 272 return error; 273 } 274 275 /* Initialize a sctp_addr from in incoming skb. */ 276 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 277 int is_saddr) 278 { 279 void *from; 280 __be16 *port; 281 struct sctphdr *sh; 282 283 port = &addr->v4.sin_port; 284 addr->v4.sin_family = AF_INET; 285 286 sh = sctp_hdr(skb); 287 if (is_saddr) { 288 *port = sh->source; 289 from = &ip_hdr(skb)->saddr; 290 } else { 291 *port = sh->dest; 292 from = &ip_hdr(skb)->daddr; 293 } 294 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 295 } 296 297 /* Initialize an sctp_addr from a socket. */ 298 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 299 { 300 addr->v4.sin_family = AF_INET; 301 addr->v4.sin_port = 0; 302 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; 303 } 304 305 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 306 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 307 { 308 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; 309 } 310 311 /* Initialize sk->sk_daddr from sctp_addr. */ 312 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 313 { 314 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; 315 } 316 317 /* Initialize a sctp_addr from an address parameter. */ 318 static void sctp_v4_from_addr_param(union sctp_addr *addr, 319 union sctp_addr_param *param, 320 __be16 port, int iif) 321 { 322 addr->v4.sin_family = AF_INET; 323 addr->v4.sin_port = port; 324 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 325 } 326 327 /* Initialize an address parameter from a sctp_addr and return the length 328 * of the address parameter. 329 */ 330 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 331 union sctp_addr_param *param) 332 { 333 int length = sizeof(sctp_ipv4addr_param_t); 334 335 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 336 param->v4.param_hdr.length = htons(length); 337 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 338 339 return length; 340 } 341 342 /* Initialize a sctp_addr from a dst_entry. */ 343 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 344 __be16 port) 345 { 346 struct rtable *rt = (struct rtable *)dst; 347 saddr->v4.sin_family = AF_INET; 348 saddr->v4.sin_port = port; 349 saddr->v4.sin_addr.s_addr = rt->rt_src; 350 } 351 352 /* Compare two addresses exactly. */ 353 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 354 const union sctp_addr *addr2) 355 { 356 if (addr1->sa.sa_family != addr2->sa.sa_family) 357 return 0; 358 if (addr1->v4.sin_port != addr2->v4.sin_port) 359 return 0; 360 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 361 return 0; 362 363 return 1; 364 } 365 366 /* Initialize addr struct to INADDR_ANY. */ 367 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 368 { 369 addr->v4.sin_family = AF_INET; 370 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 371 addr->v4.sin_port = port; 372 } 373 374 /* Is this a wildcard address? */ 375 static int sctp_v4_is_any(const union sctp_addr *addr) 376 { 377 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 378 } 379 380 /* This function checks if the address is a valid address to be used for 381 * SCTP binding. 382 * 383 * Output: 384 * Return 0 - If the address is a non-unicast or an illegal address. 385 * Return 1 - If the address is a unicast. 386 */ 387 static int sctp_v4_addr_valid(union sctp_addr *addr, 388 struct sctp_sock *sp, 389 const struct sk_buff *skb) 390 { 391 /* IPv4 addresses not allowed */ 392 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 393 return 0; 394 395 /* Is this a non-unicast address or a unusable SCTP address? */ 396 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 397 return 0; 398 399 /* Is this a broadcast address? */ 400 if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) 401 return 0; 402 403 return 1; 404 } 405 406 /* Should this be available for binding? */ 407 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 408 { 409 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 410 411 412 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 413 ret != RTN_LOCAL && 414 !sp->inet.freebind && 415 !sysctl_ip_nonlocal_bind) 416 return 0; 417 418 if (ipv6_only_sock(sctp_opt2sk(sp))) 419 return 0; 420 421 return 1; 422 } 423 424 /* Checking the loopback, private and other address scopes as defined in 425 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 426 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 427 * 428 * Level 0 - unusable SCTP addresses 429 * Level 1 - loopback address 430 * Level 2 - link-local addresses 431 * Level 3 - private addresses. 432 * Level 4 - global addresses 433 * For INIT and INIT-ACK address list, let L be the level of 434 * of requested destination address, sender and receiver 435 * SHOULD include all of its addresses with level greater 436 * than or equal to L. 437 */ 438 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 439 { 440 sctp_scope_t retval; 441 442 /* Should IPv4 scoping be a sysctl configurable option 443 * so users can turn it off (default on) for certain 444 * unconventional networking environments? 445 */ 446 447 /* Check for unusable SCTP addresses. */ 448 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 449 retval = SCTP_SCOPE_UNUSABLE; 450 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 451 retval = SCTP_SCOPE_LOOPBACK; 452 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 453 retval = SCTP_SCOPE_LINK; 454 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 455 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 456 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 457 retval = SCTP_SCOPE_PRIVATE; 458 } else { 459 retval = SCTP_SCOPE_GLOBAL; 460 } 461 462 return retval; 463 } 464 465 /* Returns a valid dst cache entry for the given source and destination ip 466 * addresses. If an association is passed, trys to get a dst entry with a 467 * source address that matches an address in the bind address list. 468 */ 469 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 470 union sctp_addr *daddr, 471 union sctp_addr *saddr) 472 { 473 struct rtable *rt; 474 struct flowi fl; 475 struct sctp_bind_addr *bp; 476 struct sctp_sockaddr_entry *laddr; 477 struct dst_entry *dst = NULL; 478 union sctp_addr dst_saddr; 479 480 memset(&fl, 0x0, sizeof(struct flowi)); 481 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 482 fl.proto = IPPROTO_SCTP; 483 if (asoc) { 484 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 485 fl.oif = asoc->base.sk->sk_bound_dev_if; 486 } 487 if (saddr) 488 fl.fl4_src = saddr->v4.sin_addr.s_addr; 489 490 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 491 __func__, &fl.fl4_dst, &fl.fl4_src); 492 493 if (!ip_route_output_key(&init_net, &rt, &fl)) { 494 dst = &rt->u.dst; 495 } 496 497 /* If there is no association or if a source address is passed, no 498 * more validation is required. 499 */ 500 if (!asoc || saddr) 501 goto out; 502 503 bp = &asoc->base.bind_addr; 504 505 if (dst) { 506 /* Walk through the bind address list and look for a bind 507 * address that matches the source address of the returned dst. 508 */ 509 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 510 rcu_read_lock(); 511 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 512 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 513 continue; 514 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 515 goto out_unlock; 516 } 517 rcu_read_unlock(); 518 519 /* None of the bound addresses match the source address of the 520 * dst. So release it. 521 */ 522 dst_release(dst); 523 dst = NULL; 524 } 525 526 /* Walk through the bind address list and try to get a dst that 527 * matches a bind address as the source address. 528 */ 529 rcu_read_lock(); 530 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 531 if (!laddr->valid) 532 continue; 533 if ((laddr->state == SCTP_ADDR_SRC) && 534 (AF_INET == laddr->a.sa.sa_family)) { 535 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 536 if (!ip_route_output_key(&init_net, &rt, &fl)) { 537 dst = &rt->u.dst; 538 goto out_unlock; 539 } 540 } 541 } 542 543 out_unlock: 544 rcu_read_unlock(); 545 out: 546 if (dst) 547 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 548 &rt->rt_dst, &rt->rt_src); 549 else 550 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 551 552 return dst; 553 } 554 555 /* For v4, the source address is cached in the route entry(dst). So no need 556 * to cache it separately and hence this is an empty routine. 557 */ 558 static void sctp_v4_get_saddr(struct sctp_sock *sk, 559 struct sctp_association *asoc, 560 struct dst_entry *dst, 561 union sctp_addr *daddr, 562 union sctp_addr *saddr) 563 { 564 struct rtable *rt = (struct rtable *)dst; 565 566 if (!asoc) 567 return; 568 569 if (rt) { 570 saddr->v4.sin_family = AF_INET; 571 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 572 saddr->v4.sin_addr.s_addr = rt->rt_src; 573 } 574 } 575 576 /* What interface did this skb arrive on? */ 577 static int sctp_v4_skb_iif(const struct sk_buff *skb) 578 { 579 return skb->rtable->rt_iif; 580 } 581 582 /* Was this packet marked by Explicit Congestion Notification? */ 583 static int sctp_v4_is_ce(const struct sk_buff *skb) 584 { 585 return INET_ECN_is_ce(ip_hdr(skb)->tos); 586 } 587 588 /* Create and initialize a new sk for the socket returned by accept(). */ 589 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 590 struct sctp_association *asoc) 591 { 592 struct 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->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 } 614 615 out: 616 return newsk; 617 } 618 619 /* Map address, empty for v4 family */ 620 static 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. */ 626 static 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 } 630 631 static 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 */ 642 static 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 */ 692 static 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. */ 718 int 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 */ 743 struct 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. */ 756 static 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. */ 767 static 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. */ 785 static 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? */ 798 static 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. */ 805 static 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 */ 824 static 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 */ 832 static 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 */ 840 static 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. */ 848 static 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->rt_src, 856 &skb->rtable->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, 0); 863 } 864 865 static struct sctp_af sctp_af_inet; 866 867 static 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. */ 881 static struct notifier_block sctp_inetaddr_notifier = { 882 .notifier_call = sctp_inetaddr_event, 883 }; 884 885 /* Socket operations. */ 886 static 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. */ 912 static struct inet_protosw sctp_seqpacket_protosw = { 913 .type = SOCK_SEQPACKET, 914 .protocol = IPPROTO_SCTP, 915 .prot = &sctp_prot, 916 .ops = &inet_seqpacket_ops, 917 .capability = -1, 918 .no_check = 0, 919 .flags = SCTP_PROTOSW_FLAG 920 }; 921 static struct inet_protosw sctp_stream_protosw = { 922 .type = SOCK_STREAM, 923 .protocol = IPPROTO_SCTP, 924 .prot = &sctp_prot, 925 .ops = &inet_seqpacket_ops, 926 .capability = -1, 927 .no_check = 0, 928 .flags = SCTP_PROTOSW_FLAG 929 }; 930 931 /* Register with IP layer. */ 932 static struct net_protocol sctp_protocol = { 933 .handler = sctp_rcv, 934 .err_handler = sctp_v4_err, 935 .no_policy = 1, 936 }; 937 938 /* IPv4 address related functions. */ 939 static struct sctp_af sctp_af_inet = { 940 .sa_family = AF_INET, 941 .sctp_xmit = sctp_v4_xmit, 942 .setsockopt = ip_setsockopt, 943 .getsockopt = ip_getsockopt, 944 .get_dst = sctp_v4_get_dst, 945 .get_saddr = sctp_v4_get_saddr, 946 .copy_addrlist = sctp_v4_copy_addrlist, 947 .from_skb = sctp_v4_from_skb, 948 .from_sk = sctp_v4_from_sk, 949 .to_sk_saddr = sctp_v4_to_sk_saddr, 950 .to_sk_daddr = sctp_v4_to_sk_daddr, 951 .from_addr_param = sctp_v4_from_addr_param, 952 .to_addr_param = sctp_v4_to_addr_param, 953 .dst_saddr = sctp_v4_dst_saddr, 954 .cmp_addr = sctp_v4_cmp_addr, 955 .addr_valid = sctp_v4_addr_valid, 956 .inaddr_any = sctp_v4_inaddr_any, 957 .is_any = sctp_v4_is_any, 958 .available = sctp_v4_available, 959 .scope = sctp_v4_scope, 960 .skb_iif = sctp_v4_skb_iif, 961 .is_ce = sctp_v4_is_ce, 962 .seq_dump_addr = sctp_v4_seq_dump_addr, 963 .ecn_capable = sctp_v4_ecn_capable, 964 .net_header_len = sizeof(struct iphdr), 965 .sockaddr_len = sizeof(struct sockaddr_in), 966 #ifdef CONFIG_COMPAT 967 .compat_setsockopt = compat_ip_setsockopt, 968 .compat_getsockopt = compat_ip_getsockopt, 969 #endif 970 }; 971 972 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 973 974 switch (family) { 975 case PF_INET: 976 return sctp_pf_inet_specific; 977 case PF_INET6: 978 return sctp_pf_inet6_specific; 979 default: 980 return NULL; 981 } 982 } 983 984 /* Register the PF specific function table. */ 985 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 986 { 987 switch (family) { 988 case PF_INET: 989 if (sctp_pf_inet_specific) 990 return 0; 991 sctp_pf_inet_specific = pf; 992 break; 993 case PF_INET6: 994 if (sctp_pf_inet6_specific) 995 return 0; 996 sctp_pf_inet6_specific = pf; 997 break; 998 default: 999 return 0; 1000 } 1001 return 1; 1002 } 1003 1004 static inline int init_sctp_mibs(void) 1005 { 1006 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); 1007 } 1008 1009 static inline void cleanup_sctp_mibs(void) 1010 { 1011 snmp_mib_free((void**)sctp_statistics); 1012 } 1013 1014 static 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 1021 static void sctp_v4_pf_exit(void) 1022 { 1023 list_del(&sctp_af_inet.list); 1024 } 1025 1026 static 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 1041 static 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 1048 static 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 1060 static 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. */ 1067 SCTP_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 initalizes 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 (num_physpages >= (128 * 1024)) 1193 goal = num_physpages >> (22 - PAGE_SHIFT); 1194 else 1195 goal = num_physpages >> (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 sctp_sysctl_register(); 1266 1267 INIT_LIST_HEAD(&sctp_address_families); 1268 sctp_v4_pf_init(); 1269 sctp_v6_pf_init(); 1270 1271 /* Initialize the local address list. */ 1272 INIT_LIST_HEAD(&sctp_local_addr_list); 1273 spin_lock_init(&sctp_local_addr_lock); 1274 sctp_get_local_addr_list(); 1275 1276 status = sctp_v4_protosw_init(); 1277 1278 if (status) 1279 goto err_protosw_init; 1280 1281 status = sctp_v6_protosw_init(); 1282 if (status) 1283 goto err_v6_protosw_init; 1284 1285 /* Initialize the control inode/socket for handling OOTB packets. */ 1286 if ((status = sctp_ctl_sock_init())) { 1287 printk (KERN_ERR 1288 "SCTP: Failed to initialize the SCTP control sock.\n"); 1289 goto err_ctl_sock_init; 1290 } 1291 1292 status = sctp_v4_add_protocol(); 1293 if (status) 1294 goto err_add_protocol; 1295 1296 /* Register SCTP with inet6 layer. */ 1297 status = sctp_v6_add_protocol(); 1298 if (status) 1299 goto err_v6_add_protocol; 1300 1301 status = 0; 1302 out: 1303 return status; 1304 err_v6_add_protocol: 1305 sctp_v4_del_protocol(); 1306 err_add_protocol: 1307 inet_ctl_sock_destroy(sctp_ctl_sock); 1308 err_ctl_sock_init: 1309 sctp_v6_protosw_exit(); 1310 err_v6_protosw_init: 1311 sctp_v4_protosw_exit(); 1312 err_protosw_init: 1313 sctp_free_local_addr_list(); 1314 sctp_v4_pf_exit(); 1315 sctp_v6_pf_exit(); 1316 sctp_sysctl_unregister(); 1317 free_pages((unsigned long)sctp_port_hashtable, 1318 get_order(sctp_port_hashsize * 1319 sizeof(struct sctp_bind_hashbucket))); 1320 err_bhash_alloc: 1321 kfree(sctp_ep_hashtable); 1322 err_ehash_alloc: 1323 free_pages((unsigned long)sctp_assoc_hashtable, 1324 get_order(sctp_assoc_hashsize * 1325 sizeof(struct sctp_hashbucket))); 1326 err_ahash_alloc: 1327 sctp_dbg_objcnt_exit(); 1328 sctp_proc_exit(); 1329 err_init_proc: 1330 cleanup_sctp_mibs(); 1331 err_init_mibs: 1332 kmem_cache_destroy(sctp_chunk_cachep); 1333 err_chunk_cachep: 1334 kmem_cache_destroy(sctp_bucket_cachep); 1335 goto out; 1336 } 1337 1338 /* Exit handler for the SCTP protocol. */ 1339 SCTP_STATIC __exit void sctp_exit(void) 1340 { 1341 /* BUG. This should probably do something useful like clean 1342 * up all the remaining associations and all that memory. 1343 */ 1344 1345 /* Unregister with inet6/inet layers. */ 1346 sctp_v6_del_protocol(); 1347 sctp_v4_del_protocol(); 1348 1349 /* Free the control endpoint. */ 1350 inet_ctl_sock_destroy(sctp_ctl_sock); 1351 1352 /* Free protosw registrations */ 1353 sctp_v6_protosw_exit(); 1354 sctp_v4_protosw_exit(); 1355 1356 /* Free the local address list. */ 1357 sctp_free_local_addr_list(); 1358 1359 /* Unregister with socket layer. */ 1360 sctp_v6_pf_exit(); 1361 sctp_v4_pf_exit(); 1362 1363 sctp_sysctl_unregister(); 1364 1365 free_pages((unsigned long)sctp_assoc_hashtable, 1366 get_order(sctp_assoc_hashsize * 1367 sizeof(struct sctp_hashbucket))); 1368 kfree(sctp_ep_hashtable); 1369 free_pages((unsigned long)sctp_port_hashtable, 1370 get_order(sctp_port_hashsize * 1371 sizeof(struct sctp_bind_hashbucket))); 1372 1373 sctp_dbg_objcnt_exit(); 1374 sctp_proc_exit(); 1375 cleanup_sctp_mibs(); 1376 1377 kmem_cache_destroy(sctp_chunk_cachep); 1378 kmem_cache_destroy(sctp_bucket_cachep); 1379 } 1380 1381 module_init(sctp_init); 1382 module_exit(sctp_exit); 1383 1384 /* 1385 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1386 */ 1387 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1388 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1389 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1390 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1391 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1392 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1393 MODULE_LICENSE("GPL"); 1394