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. */ 69 struct sctp_globals sctp_globals __read_mostly; 70 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 71 72 #ifdef CONFIG_PROC_FS 73 struct proc_dir_entry *proc_net_sctp; 74 #endif 75 76 struct idr sctp_assocs_id; 77 DEFINE_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 */ 83 static struct sock *sctp_ctl_sock; 84 85 static struct sctp_pf *sctp_pf_inet6_specific; 86 static struct sctp_pf *sctp_pf_inet_specific; 87 static struct sctp_af *sctp_af_v4_specific; 88 static struct sctp_af *sctp_af_v6_specific; 89 90 struct kmem_cache *sctp_chunk_cachep __read_mostly; 91 struct kmem_cache *sctp_bucket_cachep __read_mostly; 92 93 int sysctl_sctp_mem[3]; 94 int sysctl_sctp_rmem[3]; 95 int sysctl_sctp_wmem[3]; 96 97 /* Return the address of the control sock. */ 98 struct 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. */ 104 static __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; 125 126 out_remaddr_proc_init: 127 sctp_assocs_proc_exit(); 128 out_assocs_proc_init: 129 sctp_eps_proc_exit(); 130 out_eps_proc_init: 131 sctp_snmp_proc_exit(); 132 out_snmp_proc_init: 133 if (proc_net_sctp) { 134 proc_net_sctp = NULL; 135 remove_proc_entry("sctp", init_net.proc_net); 136 } 137 out_free_percpu: 138 percpu_counter_destroy(&sctp_sockets_allocated); 139 #else 140 return 0; 141 #endif /* CONFIG_PROC_FS */ 142 143 out_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 */ 151 static 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 */ 170 static 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 */ 202 static 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. */ 219 static 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 } 230 231 void 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'. */ 239 int 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 } 266 267 end_copy: 268 rcu_read_unlock(); 269 return error; 270 } 271 272 /* Initialize a sctp_addr from in incoming skb. */ 273 static 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. */ 295 static 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. */ 303 static 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. */ 309 static 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. */ 315 static 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 */ 327 static 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. */ 340 static 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. */ 350 static 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. */ 364 static 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? */ 372 static 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 */ 384 static 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? */ 404 static 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 */ 438 static 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 */ 464 static 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.proto = IPPROTO_SCTP; 478 if (asoc) { 479 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 480 fl.oif = asoc->base.sk->sk_bound_dev_if; 481 } 482 if (saddr) 483 fl.fl4_src = saddr->v4.sin_addr.s_addr; 484 485 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 486 __func__, &fl.fl4_dst, &fl.fl4_src); 487 488 if (!ip_route_output_key(&init_net, &rt, &fl)) { 489 dst = &rt->u.dst; 490 } 491 492 /* If there is no association or if a source address is passed, no 493 * more validation is required. 494 */ 495 if (!asoc || saddr) 496 goto out; 497 498 bp = &asoc->base.bind_addr; 499 500 if (dst) { 501 /* Walk through the bind address list and look for a bind 502 * address that matches the source address of the returned dst. 503 */ 504 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 505 rcu_read_lock(); 506 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 507 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 508 continue; 509 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 510 goto out_unlock; 511 } 512 rcu_read_unlock(); 513 514 /* None of the bound addresses match the source address of the 515 * dst. So release it. 516 */ 517 dst_release(dst); 518 dst = NULL; 519 } 520 521 /* Walk through the bind address list and try to get a dst that 522 * matches a bind address as the source address. 523 */ 524 rcu_read_lock(); 525 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 526 if (!laddr->valid) 527 continue; 528 if ((laddr->state == SCTP_ADDR_SRC) && 529 (AF_INET == laddr->a.sa.sa_family)) { 530 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 531 if (!ip_route_output_key(&init_net, &rt, &fl)) { 532 dst = &rt->u.dst; 533 goto out_unlock; 534 } 535 } 536 } 537 538 out_unlock: 539 rcu_read_unlock(); 540 out: 541 if (dst) 542 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 543 &rt->rt_dst, &rt->rt_src); 544 else 545 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 546 547 return dst; 548 } 549 550 /* For v4, the source address is cached in the route entry(dst). So no need 551 * to cache it separately and hence this is an empty routine. 552 */ 553 static void sctp_v4_get_saddr(struct sctp_sock *sk, 554 struct sctp_association *asoc, 555 struct dst_entry *dst, 556 union sctp_addr *daddr, 557 union sctp_addr *saddr) 558 { 559 struct rtable *rt = (struct rtable *)dst; 560 561 if (!asoc) 562 return; 563 564 if (rt) { 565 saddr->v4.sin_family = AF_INET; 566 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 567 saddr->v4.sin_addr.s_addr = rt->rt_src; 568 } 569 } 570 571 /* What interface did this skb arrive on? */ 572 static int sctp_v4_skb_iif(const struct sk_buff *skb) 573 { 574 return skb_rtable(skb)->rt_iif; 575 } 576 577 /* Was this packet marked by Explicit Congestion Notification? */ 578 static int sctp_v4_is_ce(const struct sk_buff *skb) 579 { 580 return INET_ECN_is_ce(ip_hdr(skb)->tos); 581 } 582 583 /* Create and initialize a new sk for the socket returned by accept(). */ 584 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 585 struct sctp_association *asoc) 586 { 587 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 588 sk->sk_prot); 589 struct inet_sock *newinet; 590 591 if (!newsk) 592 goto out; 593 594 sock_init_data(NULL, newsk); 595 596 sctp_copy_sock(newsk, sk, asoc); 597 sock_reset_flag(newsk, SOCK_ZAPPED); 598 599 newinet = inet_sk(newsk); 600 601 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 602 603 sk_refcnt_debug_inc(newsk); 604 605 if (newsk->sk_prot->init(newsk)) { 606 sk_common_release(newsk); 607 newsk = NULL; 608 } 609 610 out: 611 return newsk; 612 } 613 614 /* Map address, empty for v4 family */ 615 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 616 { 617 /* Empty */ 618 } 619 620 /* Dump the v4 addr to the seq file. */ 621 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 622 { 623 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 624 } 625 626 static void sctp_v4_ecn_capable(struct sock *sk) 627 { 628 INET_ECN_xmit(sk); 629 } 630 631 /* Event handler for inet address addition/deletion events. 632 * The sctp_local_addr_list needs to be protocted by a spin lock since 633 * multiple notifiers (say IPv4 and IPv6) may be running at the same 634 * time and thus corrupt the list. 635 * The reader side is protected with RCU. 636 */ 637 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 638 void *ptr) 639 { 640 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 641 struct sctp_sockaddr_entry *addr = NULL; 642 struct sctp_sockaddr_entry *temp; 643 int found = 0; 644 645 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 646 return NOTIFY_DONE; 647 648 switch (ev) { 649 case NETDEV_UP: 650 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 651 if (addr) { 652 addr->a.v4.sin_family = AF_INET; 653 addr->a.v4.sin_port = 0; 654 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 655 addr->valid = 1; 656 spin_lock_bh(&sctp_local_addr_lock); 657 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 658 spin_unlock_bh(&sctp_local_addr_lock); 659 } 660 break; 661 case NETDEV_DOWN: 662 spin_lock_bh(&sctp_local_addr_lock); 663 list_for_each_entry_safe(addr, temp, 664 &sctp_local_addr_list, list) { 665 if (addr->a.sa.sa_family == AF_INET && 666 addr->a.v4.sin_addr.s_addr == 667 ifa->ifa_local) { 668 found = 1; 669 addr->valid = 0; 670 list_del_rcu(&addr->list); 671 break; 672 } 673 } 674 spin_unlock_bh(&sctp_local_addr_lock); 675 if (found) 676 call_rcu(&addr->rcu, sctp_local_addr_free); 677 break; 678 } 679 680 return NOTIFY_DONE; 681 } 682 683 /* 684 * Initialize the control inode/socket with a control endpoint data 685 * structure. This endpoint is reserved exclusively for the OOTB processing. 686 */ 687 static int sctp_ctl_sock_init(void) 688 { 689 int err; 690 sa_family_t family = PF_INET; 691 692 if (sctp_get_pf_specific(PF_INET6)) 693 family = PF_INET6; 694 695 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 696 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 697 698 /* If IPv6 socket could not be created, try the IPv4 socket */ 699 if (err < 0 && family == PF_INET6) 700 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 701 SOCK_SEQPACKET, IPPROTO_SCTP, 702 &init_net); 703 704 if (err < 0) { 705 printk(KERN_ERR 706 "SCTP: Failed to create the SCTP control socket.\n"); 707 return err; 708 } 709 return 0; 710 } 711 712 /* Register address family specific functions. */ 713 int sctp_register_af(struct sctp_af *af) 714 { 715 switch (af->sa_family) { 716 case AF_INET: 717 if (sctp_af_v4_specific) 718 return 0; 719 sctp_af_v4_specific = af; 720 break; 721 case AF_INET6: 722 if (sctp_af_v6_specific) 723 return 0; 724 sctp_af_v6_specific = af; 725 break; 726 default: 727 return 0; 728 } 729 730 INIT_LIST_HEAD(&af->list); 731 list_add_tail(&af->list, &sctp_address_families); 732 return 1; 733 } 734 735 /* Get the table of functions for manipulating a particular address 736 * family. 737 */ 738 struct sctp_af *sctp_get_af_specific(sa_family_t family) 739 { 740 switch (family) { 741 case AF_INET: 742 return sctp_af_v4_specific; 743 case AF_INET6: 744 return sctp_af_v6_specific; 745 default: 746 return NULL; 747 } 748 } 749 750 /* Common code to initialize a AF_INET msg_name. */ 751 static void sctp_inet_msgname(char *msgname, int *addr_len) 752 { 753 struct sockaddr_in *sin; 754 755 sin = (struct sockaddr_in *)msgname; 756 *addr_len = sizeof(struct sockaddr_in); 757 sin->sin_family = AF_INET; 758 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 759 } 760 761 /* Copy the primary address of the peer primary address as the msg_name. */ 762 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 763 int *addr_len) 764 { 765 struct sockaddr_in *sin, *sinfrom; 766 767 if (msgname) { 768 struct sctp_association *asoc; 769 770 asoc = event->asoc; 771 sctp_inet_msgname(msgname, addr_len); 772 sin = (struct sockaddr_in *)msgname; 773 sinfrom = &asoc->peer.primary_addr.v4; 774 sin->sin_port = htons(asoc->peer.port); 775 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 776 } 777 } 778 779 /* Initialize and copy out a msgname from an inbound skb. */ 780 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 781 { 782 if (msgname) { 783 struct sctphdr *sh = sctp_hdr(skb); 784 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 785 786 sctp_inet_msgname(msgname, len); 787 sin->sin_port = sh->source; 788 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 789 } 790 } 791 792 /* Do we support this AF? */ 793 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 794 { 795 /* PF_INET only supports AF_INET addresses. */ 796 return (AF_INET == family); 797 } 798 799 /* Address matching with wildcards allowed. */ 800 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 801 const union sctp_addr *addr2, 802 struct sctp_sock *opt) 803 { 804 /* PF_INET only supports AF_INET addresses. */ 805 if (addr1->sa.sa_family != addr2->sa.sa_family) 806 return 0; 807 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 808 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 809 return 1; 810 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 811 return 1; 812 813 return 0; 814 } 815 816 /* Verify that provided sockaddr looks bindable. Common verification has 817 * already been taken care of. 818 */ 819 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 820 { 821 return sctp_v4_available(addr, opt); 822 } 823 824 /* Verify that sockaddr looks sendable. Common verification has already 825 * been taken care of. 826 */ 827 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 828 { 829 return 1; 830 } 831 832 /* Fill in Supported Address Type information for INIT and INIT-ACK 833 * chunks. Returns number of addresses supported. 834 */ 835 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 836 __be16 *types) 837 { 838 types[0] = SCTP_PARAM_IPV4_ADDRESS; 839 return 1; 840 } 841 842 /* Wrapper routine that calls the ip transmit routine. */ 843 static inline int sctp_v4_xmit(struct sk_buff *skb, 844 struct sctp_transport *transport) 845 { 846 struct inet_sock *inet = inet_sk(skb->sk); 847 848 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 849 __func__, skb, skb->len, 850 &skb_rtable(skb)->rt_src, 851 &skb_rtable(skb)->rt_dst); 852 853 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 854 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 855 856 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 857 return ip_queue_xmit(skb, 0); 858 } 859 860 static struct sctp_af sctp_af_inet; 861 862 static struct sctp_pf sctp_pf_inet = { 863 .event_msgname = sctp_inet_event_msgname, 864 .skb_msgname = sctp_inet_skb_msgname, 865 .af_supported = sctp_inet_af_supported, 866 .cmp_addr = sctp_inet_cmp_addr, 867 .bind_verify = sctp_inet_bind_verify, 868 .send_verify = sctp_inet_send_verify, 869 .supported_addrs = sctp_inet_supported_addrs, 870 .create_accept_sk = sctp_v4_create_accept_sk, 871 .addr_v4map = sctp_v4_addr_v4map, 872 .af = &sctp_af_inet 873 }; 874 875 /* Notifier for inetaddr addition/deletion events. */ 876 static struct notifier_block sctp_inetaddr_notifier = { 877 .notifier_call = sctp_inetaddr_event, 878 }; 879 880 /* Socket operations. */ 881 static const struct proto_ops inet_seqpacket_ops = { 882 .family = PF_INET, 883 .owner = THIS_MODULE, 884 .release = inet_release, /* Needs to be wrapped... */ 885 .bind = inet_bind, 886 .connect = inet_dgram_connect, 887 .socketpair = sock_no_socketpair, 888 .accept = inet_accept, 889 .getname = inet_getname, /* Semantics are different. */ 890 .poll = sctp_poll, 891 .ioctl = inet_ioctl, 892 .listen = sctp_inet_listen, 893 .shutdown = inet_shutdown, /* Looks harmless. */ 894 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 895 .getsockopt = sock_common_getsockopt, 896 .sendmsg = inet_sendmsg, 897 .recvmsg = sock_common_recvmsg, 898 .mmap = sock_no_mmap, 899 .sendpage = sock_no_sendpage, 900 #ifdef CONFIG_COMPAT 901 .compat_setsockopt = compat_sock_common_setsockopt, 902 .compat_getsockopt = compat_sock_common_getsockopt, 903 #endif 904 }; 905 906 /* Registration with AF_INET family. */ 907 static struct inet_protosw sctp_seqpacket_protosw = { 908 .type = SOCK_SEQPACKET, 909 .protocol = IPPROTO_SCTP, 910 .prot = &sctp_prot, 911 .ops = &inet_seqpacket_ops, 912 .no_check = 0, 913 .flags = SCTP_PROTOSW_FLAG 914 }; 915 static struct inet_protosw sctp_stream_protosw = { 916 .type = SOCK_STREAM, 917 .protocol = IPPROTO_SCTP, 918 .prot = &sctp_prot, 919 .ops = &inet_seqpacket_ops, 920 .no_check = 0, 921 .flags = SCTP_PROTOSW_FLAG 922 }; 923 924 /* Register with IP layer. */ 925 static const struct net_protocol sctp_protocol = { 926 .handler = sctp_rcv, 927 .err_handler = sctp_v4_err, 928 .no_policy = 1, 929 }; 930 931 /* IPv4 address related functions. */ 932 static struct sctp_af sctp_af_inet = { 933 .sa_family = AF_INET, 934 .sctp_xmit = sctp_v4_xmit, 935 .setsockopt = ip_setsockopt, 936 .getsockopt = ip_getsockopt, 937 .get_dst = sctp_v4_get_dst, 938 .get_saddr = sctp_v4_get_saddr, 939 .copy_addrlist = sctp_v4_copy_addrlist, 940 .from_skb = sctp_v4_from_skb, 941 .from_sk = sctp_v4_from_sk, 942 .to_sk_saddr = sctp_v4_to_sk_saddr, 943 .to_sk_daddr = sctp_v4_to_sk_daddr, 944 .from_addr_param = sctp_v4_from_addr_param, 945 .to_addr_param = sctp_v4_to_addr_param, 946 .dst_saddr = sctp_v4_dst_saddr, 947 .cmp_addr = sctp_v4_cmp_addr, 948 .addr_valid = sctp_v4_addr_valid, 949 .inaddr_any = sctp_v4_inaddr_any, 950 .is_any = sctp_v4_is_any, 951 .available = sctp_v4_available, 952 .scope = sctp_v4_scope, 953 .skb_iif = sctp_v4_skb_iif, 954 .is_ce = sctp_v4_is_ce, 955 .seq_dump_addr = sctp_v4_seq_dump_addr, 956 .ecn_capable = sctp_v4_ecn_capable, 957 .net_header_len = sizeof(struct iphdr), 958 .sockaddr_len = sizeof(struct sockaddr_in), 959 #ifdef CONFIG_COMPAT 960 .compat_setsockopt = compat_ip_setsockopt, 961 .compat_getsockopt = compat_ip_getsockopt, 962 #endif 963 }; 964 965 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 966 967 switch (family) { 968 case PF_INET: 969 return sctp_pf_inet_specific; 970 case PF_INET6: 971 return sctp_pf_inet6_specific; 972 default: 973 return NULL; 974 } 975 } 976 977 /* Register the PF specific function table. */ 978 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 979 { 980 switch (family) { 981 case PF_INET: 982 if (sctp_pf_inet_specific) 983 return 0; 984 sctp_pf_inet_specific = pf; 985 break; 986 case PF_INET6: 987 if (sctp_pf_inet6_specific) 988 return 0; 989 sctp_pf_inet6_specific = pf; 990 break; 991 default: 992 return 0; 993 } 994 return 1; 995 } 996 997 static inline int init_sctp_mibs(void) 998 { 999 return snmp_mib_init((void __percpu **)sctp_statistics, 1000 sizeof(struct sctp_mib)); 1001 } 1002 1003 static inline void cleanup_sctp_mibs(void) 1004 { 1005 snmp_mib_free((void __percpu **)sctp_statistics); 1006 } 1007 1008 static void sctp_v4_pf_init(void) 1009 { 1010 /* Initialize the SCTP specific PF functions. */ 1011 sctp_register_pf(&sctp_pf_inet, PF_INET); 1012 sctp_register_af(&sctp_af_inet); 1013 } 1014 1015 static void sctp_v4_pf_exit(void) 1016 { 1017 list_del(&sctp_af_inet.list); 1018 } 1019 1020 static int sctp_v4_protosw_init(void) 1021 { 1022 int rc; 1023 1024 rc = proto_register(&sctp_prot, 1); 1025 if (rc) 1026 return rc; 1027 1028 /* Register SCTP(UDP and TCP style) with socket layer. */ 1029 inet_register_protosw(&sctp_seqpacket_protosw); 1030 inet_register_protosw(&sctp_stream_protosw); 1031 1032 return 0; 1033 } 1034 1035 static void sctp_v4_protosw_exit(void) 1036 { 1037 inet_unregister_protosw(&sctp_stream_protosw); 1038 inet_unregister_protosw(&sctp_seqpacket_protosw); 1039 proto_unregister(&sctp_prot); 1040 } 1041 1042 static int sctp_v4_add_protocol(void) 1043 { 1044 /* Register notifier for inet address additions/deletions. */ 1045 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1046 1047 /* Register SCTP with inet layer. */ 1048 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1049 return -EAGAIN; 1050 1051 return 0; 1052 } 1053 1054 static void sctp_v4_del_protocol(void) 1055 { 1056 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1057 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1058 } 1059 1060 /* Initialize the universe into something sensible. */ 1061 SCTP_STATIC __init int sctp_init(void) 1062 { 1063 int i; 1064 int status = -EINVAL; 1065 unsigned long goal; 1066 unsigned long limit; 1067 unsigned long nr_pages; 1068 int max_share; 1069 int order; 1070 1071 /* SCTP_DEBUG sanity check. */ 1072 if (!sctp_sanity_check()) 1073 goto out; 1074 1075 /* Allocate bind_bucket and chunk caches. */ 1076 status = -ENOBUFS; 1077 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1078 sizeof(struct sctp_bind_bucket), 1079 0, SLAB_HWCACHE_ALIGN, 1080 NULL); 1081 if (!sctp_bucket_cachep) 1082 goto out; 1083 1084 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1085 sizeof(struct sctp_chunk), 1086 0, SLAB_HWCACHE_ALIGN, 1087 NULL); 1088 if (!sctp_chunk_cachep) 1089 goto err_chunk_cachep; 1090 1091 /* Allocate and initialise sctp mibs. */ 1092 status = init_sctp_mibs(); 1093 if (status) 1094 goto err_init_mibs; 1095 1096 /* Initialize proc fs directory. */ 1097 status = sctp_proc_init(); 1098 if (status) 1099 goto err_init_proc; 1100 1101 /* Initialize object count debugging. */ 1102 sctp_dbg_objcnt_init(); 1103 1104 /* 1105 * 14. Suggested SCTP Protocol Parameter Values 1106 */ 1107 /* The following protocol parameters are RECOMMENDED: */ 1108 /* RTO.Initial - 3 seconds */ 1109 sctp_rto_initial = SCTP_RTO_INITIAL; 1110 /* RTO.Min - 1 second */ 1111 sctp_rto_min = SCTP_RTO_MIN; 1112 /* RTO.Max - 60 seconds */ 1113 sctp_rto_max = SCTP_RTO_MAX; 1114 /* RTO.Alpha - 1/8 */ 1115 sctp_rto_alpha = SCTP_RTO_ALPHA; 1116 /* RTO.Beta - 1/4 */ 1117 sctp_rto_beta = SCTP_RTO_BETA; 1118 1119 /* Valid.Cookie.Life - 60 seconds */ 1120 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1121 1122 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1123 sctp_cookie_preserve_enable = 1; 1124 1125 /* Max.Burst - 4 */ 1126 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1127 1128 /* Association.Max.Retrans - 10 attempts 1129 * Path.Max.Retrans - 5 attempts (per destination address) 1130 * Max.Init.Retransmits - 8 attempts 1131 */ 1132 sctp_max_retrans_association = 10; 1133 sctp_max_retrans_path = 5; 1134 sctp_max_retrans_init = 8; 1135 1136 /* Sendbuffer growth - do per-socket accounting */ 1137 sctp_sndbuf_policy = 0; 1138 1139 /* Rcvbuffer growth - do per-socket accounting */ 1140 sctp_rcvbuf_policy = 0; 1141 1142 /* HB.interval - 30 seconds */ 1143 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1144 1145 /* delayed SACK timeout */ 1146 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1147 1148 /* Implementation specific variables. */ 1149 1150 /* Initialize default stream count setup information. */ 1151 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1152 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1153 1154 /* Initialize handle used for association ids. */ 1155 idr_init(&sctp_assocs_id); 1156 1157 /* Set the pressure threshold to be a fraction of global memory that 1158 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1159 * memory, with a floor of 128 pages. 1160 * Note this initalizes the data in sctpv6_prot too 1161 * Unabashedly stolen from tcp_init 1162 */ 1163 nr_pages = totalram_pages - totalhigh_pages; 1164 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1165 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1166 limit = max(limit, 128UL); 1167 sysctl_sctp_mem[0] = limit / 4 * 3; 1168 sysctl_sctp_mem[1] = limit; 1169 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1170 1171 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1172 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1173 max_share = min(4UL*1024*1024, limit); 1174 1175 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1176 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1177 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1178 1179 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1180 sysctl_sctp_wmem[1] = 16*1024; 1181 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1182 1183 /* Size and allocate the association hash table. 1184 * The methodology is similar to that of the tcp hash tables. 1185 */ 1186 if (totalram_pages >= (128 * 1024)) 1187 goal = totalram_pages >> (22 - PAGE_SHIFT); 1188 else 1189 goal = totalram_pages >> (24 - PAGE_SHIFT); 1190 1191 for (order = 0; (1UL << order) < goal; order++) 1192 ; 1193 1194 do { 1195 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1196 sizeof(struct sctp_hashbucket); 1197 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1198 continue; 1199 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1200 __get_free_pages(GFP_ATOMIC, order); 1201 } while (!sctp_assoc_hashtable && --order > 0); 1202 if (!sctp_assoc_hashtable) { 1203 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1204 status = -ENOMEM; 1205 goto err_ahash_alloc; 1206 } 1207 for (i = 0; i < sctp_assoc_hashsize; i++) { 1208 rwlock_init(&sctp_assoc_hashtable[i].lock); 1209 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1210 } 1211 1212 /* Allocate and initialize the endpoint hash table. */ 1213 sctp_ep_hashsize = 64; 1214 sctp_ep_hashtable = (struct sctp_hashbucket *) 1215 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1216 if (!sctp_ep_hashtable) { 1217 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1218 status = -ENOMEM; 1219 goto err_ehash_alloc; 1220 } 1221 for (i = 0; i < sctp_ep_hashsize; i++) { 1222 rwlock_init(&sctp_ep_hashtable[i].lock); 1223 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1224 } 1225 1226 /* Allocate and initialize the SCTP port hash table. */ 1227 do { 1228 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1229 sizeof(struct sctp_bind_hashbucket); 1230 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1231 continue; 1232 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1233 __get_free_pages(GFP_ATOMIC, order); 1234 } while (!sctp_port_hashtable && --order > 0); 1235 if (!sctp_port_hashtable) { 1236 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1237 status = -ENOMEM; 1238 goto err_bhash_alloc; 1239 } 1240 for (i = 0; i < sctp_port_hashsize; i++) { 1241 spin_lock_init(&sctp_port_hashtable[i].lock); 1242 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1243 } 1244 1245 printk(KERN_INFO "SCTP: Hash tables configured " 1246 "(established %d bind %d)\n", 1247 sctp_assoc_hashsize, sctp_port_hashsize); 1248 1249 /* Disable ADDIP by default. */ 1250 sctp_addip_enable = 0; 1251 sctp_addip_noauth = 0; 1252 1253 /* Enable PR-SCTP by default. */ 1254 sctp_prsctp_enable = 1; 1255 1256 /* Disable AUTH by default. */ 1257 sctp_auth_enable = 0; 1258 1259 /* Set SCOPE policy to enabled */ 1260 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1261 1262 /* Set the default rwnd update threshold */ 1263 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 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 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1378 1379 kmem_cache_destroy(sctp_chunk_cachep); 1380 kmem_cache_destroy(sctp_bucket_cachep); 1381 } 1382 1383 module_init(sctp_init); 1384 module_exit(sctp_exit); 1385 1386 /* 1387 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1388 */ 1389 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1390 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1391 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1392 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1393 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1394 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1395 MODULE_LICENSE("GPL"); 1396