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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 50 51 #include <linux/module.h> 52 #include <linux/init.h> 53 #include <linux/netdevice.h> 54 #include <linux/inetdevice.h> 55 #include <linux/seq_file.h> 56 #include <linux/bootmem.h> 57 #include <linux/highmem.h> 58 #include <linux/swap.h> 59 #include <linux/slab.h> 60 #include <net/net_namespace.h> 61 #include <net/protocol.h> 62 #include <net/ip.h> 63 #include <net/ipv6.h> 64 #include <net/route.h> 65 #include <net/sctp/sctp.h> 66 #include <net/addrconf.h> 67 #include <net/inet_common.h> 68 #include <net/inet_ecn.h> 69 70 /* Global data structures. */ 71 struct sctp_globals sctp_globals __read_mostly; 72 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly; 73 74 #ifdef CONFIG_PROC_FS 75 struct proc_dir_entry *proc_net_sctp; 76 #endif 77 78 struct idr sctp_assocs_id; 79 DEFINE_SPINLOCK(sctp_assocs_id_lock); 80 81 /* This is the global socket data structure used for responding to 82 * the Out-of-the-blue (OOTB) packets. A control sock will be created 83 * for this socket at the initialization time. 84 */ 85 static struct sock *sctp_ctl_sock; 86 87 static struct sctp_pf *sctp_pf_inet6_specific; 88 static struct sctp_pf *sctp_pf_inet_specific; 89 static struct sctp_af *sctp_af_v4_specific; 90 static struct sctp_af *sctp_af_v6_specific; 91 92 struct kmem_cache *sctp_chunk_cachep __read_mostly; 93 struct kmem_cache *sctp_bucket_cachep __read_mostly; 94 95 long sysctl_sctp_mem[3]; 96 int sysctl_sctp_rmem[3]; 97 int sysctl_sctp_wmem[3]; 98 99 /* Return the address of the control sock. */ 100 struct sock *sctp_get_ctl_sock(void) 101 { 102 return sctp_ctl_sock; 103 } 104 105 /* Set up the proc fs entry for the SCTP protocol. */ 106 static __init int sctp_proc_init(void) 107 { 108 if (percpu_counter_init(&sctp_sockets_allocated, 0)) 109 goto out_nomem; 110 #ifdef CONFIG_PROC_FS 111 if (!proc_net_sctp) { 112 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 113 if (!proc_net_sctp) 114 goto out_free_percpu; 115 } 116 117 if (sctp_snmp_proc_init()) 118 goto out_snmp_proc_init; 119 if (sctp_eps_proc_init()) 120 goto out_eps_proc_init; 121 if (sctp_assocs_proc_init()) 122 goto out_assocs_proc_init; 123 if (sctp_remaddr_proc_init()) 124 goto out_remaddr_proc_init; 125 126 return 0; 127 128 out_remaddr_proc_init: 129 sctp_assocs_proc_exit(); 130 out_assocs_proc_init: 131 sctp_eps_proc_exit(); 132 out_eps_proc_init: 133 sctp_snmp_proc_exit(); 134 out_snmp_proc_init: 135 if (proc_net_sctp) { 136 proc_net_sctp = NULL; 137 remove_proc_entry("sctp", init_net.proc_net); 138 } 139 out_free_percpu: 140 percpu_counter_destroy(&sctp_sockets_allocated); 141 #else 142 return 0; 143 #endif /* CONFIG_PROC_FS */ 144 145 out_nomem: 146 return -ENOMEM; 147 } 148 149 /* Clean up the proc fs entry for the SCTP protocol. 150 * Note: Do not make this __exit as it is used in the init error 151 * path. 152 */ 153 static void sctp_proc_exit(void) 154 { 155 #ifdef CONFIG_PROC_FS 156 sctp_snmp_proc_exit(); 157 sctp_eps_proc_exit(); 158 sctp_assocs_proc_exit(); 159 sctp_remaddr_proc_exit(); 160 161 if (proc_net_sctp) { 162 proc_net_sctp = NULL; 163 remove_proc_entry("sctp", init_net.proc_net); 164 } 165 #endif 166 percpu_counter_destroy(&sctp_sockets_allocated); 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 list_add_tail(&addr->list, addrlist); 195 } 196 } 197 198 rcu_read_unlock(); 199 } 200 201 /* Extract our IP addresses from the system and stash them in the 202 * protocol structure. 203 */ 204 static void sctp_get_local_addr_list(void) 205 { 206 struct net_device *dev; 207 struct list_head *pos; 208 struct sctp_af *af; 209 210 rcu_read_lock(); 211 for_each_netdev_rcu(&init_net, dev) { 212 __list_for_each(pos, &sctp_address_families) { 213 af = list_entry(pos, struct sctp_af, list); 214 af->copy_addrlist(&sctp_local_addr_list, dev); 215 } 216 } 217 rcu_read_unlock(); 218 } 219 220 /* Free the existing local addresses. */ 221 static void sctp_free_local_addr_list(void) 222 { 223 struct sctp_sockaddr_entry *addr; 224 struct list_head *pos, *temp; 225 226 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 227 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 228 list_del(pos); 229 kfree(addr); 230 } 231 } 232 233 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 234 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 235 gfp_t gfp, int copy_flags) 236 { 237 struct sctp_sockaddr_entry *addr; 238 int error = 0; 239 240 rcu_read_lock(); 241 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 242 if (!addr->valid) 243 continue; 244 if (sctp_in_scope(&addr->a, scope)) { 245 /* Now that the address is in scope, check to see if 246 * the address type is really supported by the local 247 * sock as well as the remote peer. 248 */ 249 if ((((AF_INET == addr->a.sa.sa_family) && 250 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 251 (((AF_INET6 == addr->a.sa.sa_family) && 252 (copy_flags & SCTP_ADDR6_ALLOWED) && 253 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 254 error = sctp_add_bind_addr(bp, &addr->a, 255 SCTP_ADDR_SRC, GFP_ATOMIC); 256 if (error) 257 goto end_copy; 258 } 259 } 260 } 261 262 end_copy: 263 rcu_read_unlock(); 264 return error; 265 } 266 267 /* Initialize a sctp_addr from in incoming skb. */ 268 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 269 int is_saddr) 270 { 271 void *from; 272 __be16 *port; 273 struct sctphdr *sh; 274 275 port = &addr->v4.sin_port; 276 addr->v4.sin_family = AF_INET; 277 278 sh = sctp_hdr(skb); 279 if (is_saddr) { 280 *port = sh->source; 281 from = &ip_hdr(skb)->saddr; 282 } else { 283 *port = sh->dest; 284 from = &ip_hdr(skb)->daddr; 285 } 286 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 287 } 288 289 /* Initialize an sctp_addr from a socket. */ 290 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 291 { 292 addr->v4.sin_family = AF_INET; 293 addr->v4.sin_port = 0; 294 addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr; 295 } 296 297 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 298 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 299 { 300 inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr; 301 } 302 303 /* Initialize sk->sk_daddr from sctp_addr. */ 304 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 305 { 306 inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr; 307 } 308 309 /* Initialize a sctp_addr from an address parameter. */ 310 static void sctp_v4_from_addr_param(union sctp_addr *addr, 311 union sctp_addr_param *param, 312 __be16 port, int iif) 313 { 314 addr->v4.sin_family = AF_INET; 315 addr->v4.sin_port = port; 316 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 317 } 318 319 /* Initialize an address parameter from a sctp_addr and return the length 320 * of the address parameter. 321 */ 322 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 323 union sctp_addr_param *param) 324 { 325 int length = sizeof(sctp_ipv4addr_param_t); 326 327 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 328 param->v4.param_hdr.length = htons(length); 329 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 330 331 return length; 332 } 333 334 /* Initialize a sctp_addr from a dst_entry. */ 335 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4, 336 __be16 port) 337 { 338 saddr->v4.sin_family = AF_INET; 339 saddr->v4.sin_port = port; 340 saddr->v4.sin_addr.s_addr = fl4->saddr; 341 } 342 343 /* Compare two addresses exactly. */ 344 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 345 const union sctp_addr *addr2) 346 { 347 if (addr1->sa.sa_family != addr2->sa.sa_family) 348 return 0; 349 if (addr1->v4.sin_port != addr2->v4.sin_port) 350 return 0; 351 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 352 return 0; 353 354 return 1; 355 } 356 357 /* Initialize addr struct to INADDR_ANY. */ 358 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 359 { 360 addr->v4.sin_family = AF_INET; 361 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 362 addr->v4.sin_port = port; 363 } 364 365 /* Is this a wildcard address? */ 366 static int sctp_v4_is_any(const union sctp_addr *addr) 367 { 368 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 369 } 370 371 /* This function checks if the address is a valid address to be used for 372 * SCTP binding. 373 * 374 * Output: 375 * Return 0 - If the address is a non-unicast or an illegal address. 376 * Return 1 - If the address is a unicast. 377 */ 378 static int sctp_v4_addr_valid(union sctp_addr *addr, 379 struct sctp_sock *sp, 380 const struct sk_buff *skb) 381 { 382 /* IPv4 addresses not allowed */ 383 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 384 return 0; 385 386 /* Is this a non-unicast address or a unusable SCTP address? */ 387 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 388 return 0; 389 390 /* Is this a broadcast address? */ 391 if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST) 392 return 0; 393 394 return 1; 395 } 396 397 /* Should this be available for binding? */ 398 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 399 { 400 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 401 402 403 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 404 ret != RTN_LOCAL && 405 !sp->inet.freebind && 406 !sysctl_ip_nonlocal_bind) 407 return 0; 408 409 if (ipv6_only_sock(sctp_opt2sk(sp))) 410 return 0; 411 412 return 1; 413 } 414 415 /* Checking the loopback, private and other address scopes as defined in 416 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 417 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 418 * 419 * Level 0 - unusable SCTP addresses 420 * Level 1 - loopback address 421 * Level 2 - link-local addresses 422 * Level 3 - private addresses. 423 * Level 4 - global addresses 424 * For INIT and INIT-ACK address list, let L be the level of 425 * of requested destination address, sender and receiver 426 * SHOULD include all of its addresses with level greater 427 * than or equal to L. 428 * 429 * IPv4 scoping can be controlled through sysctl option 430 * net.sctp.addr_scope_policy 431 */ 432 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 433 { 434 sctp_scope_t retval; 435 436 /* Check for unusable SCTP addresses. */ 437 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 438 retval = SCTP_SCOPE_UNUSABLE; 439 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 440 retval = SCTP_SCOPE_LOOPBACK; 441 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 442 retval = SCTP_SCOPE_LINK; 443 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 444 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 445 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 446 retval = SCTP_SCOPE_PRIVATE; 447 } else { 448 retval = SCTP_SCOPE_GLOBAL; 449 } 450 451 return retval; 452 } 453 454 /* Returns a valid dst cache entry for the given source and destination ip 455 * addresses. If an association is passed, trys to get a dst entry with a 456 * source address that matches an address in the bind address list. 457 */ 458 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr, 459 struct flowi *fl, struct sock *sk) 460 { 461 struct sctp_association *asoc = t->asoc; 462 struct rtable *rt; 463 struct flowi4 *fl4 = &fl->u.ip4; 464 struct sctp_bind_addr *bp; 465 struct sctp_sockaddr_entry *laddr; 466 struct dst_entry *dst = NULL; 467 union sctp_addr *daddr = &t->ipaddr; 468 union sctp_addr dst_saddr; 469 470 memset(fl4, 0x0, sizeof(struct flowi4)); 471 fl4->daddr = daddr->v4.sin_addr.s_addr; 472 fl4->fl4_dport = daddr->v4.sin_port; 473 fl4->flowi4_proto = IPPROTO_SCTP; 474 if (asoc) { 475 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk); 476 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if; 477 fl4->fl4_sport = htons(asoc->base.bind_addr.port); 478 } 479 if (saddr) { 480 fl4->saddr = saddr->v4.sin_addr.s_addr; 481 fl4->fl4_sport = saddr->v4.sin_port; 482 } 483 484 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 485 __func__, &fl4->daddr, &fl4->saddr); 486 487 rt = ip_route_output_key(&init_net, fl4); 488 if (!IS_ERR(rt)) 489 dst = &rt->dst; 490 491 /* If there is no association or if a source address is passed, no 492 * more validation is required. 493 */ 494 if (!asoc || saddr) 495 goto out; 496 497 bp = &asoc->base.bind_addr; 498 499 if (dst) { 500 /* Walk through the bind address list and look for a bind 501 * address that matches the source address of the returned dst. 502 */ 503 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port)); 504 rcu_read_lock(); 505 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 506 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 507 continue; 508 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 509 goto out_unlock; 510 } 511 rcu_read_unlock(); 512 513 /* None of the bound addresses match the source address of the 514 * dst. So release it. 515 */ 516 dst_release(dst); 517 dst = NULL; 518 } 519 520 /* Walk through the bind address list and try to get a dst that 521 * matches a bind address as the source address. 522 */ 523 rcu_read_lock(); 524 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 525 if (!laddr->valid) 526 continue; 527 if ((laddr->state == SCTP_ADDR_SRC) && 528 (AF_INET == laddr->a.sa.sa_family)) { 529 fl4->saddr = laddr->a.v4.sin_addr.s_addr; 530 fl4->fl4_sport = laddr->a.v4.sin_port; 531 rt = ip_route_output_key(&init_net, fl4); 532 if (!IS_ERR(rt)) { 533 dst = &rt->dst; 534 goto out_unlock; 535 } 536 } 537 } 538 539 out_unlock: 540 rcu_read_unlock(); 541 out: 542 t->dst = dst; 543 if (dst) 544 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 545 &fl4->daddr, &fl4->saddr); 546 else 547 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 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_transport *t, 555 struct flowi *fl) 556 { 557 union sctp_addr *saddr = &t->saddr; 558 struct rtable *rt = (struct rtable *)t->dst; 559 560 if (rt) { 561 saddr->v4.sin_family = AF_INET; 562 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr; 563 } 564 } 565 566 /* What interface did this skb arrive on? */ 567 static int sctp_v4_skb_iif(const struct sk_buff *skb) 568 { 569 return skb_rtable(skb)->rt_iif; 570 } 571 572 /* Was this packet marked by Explicit Congestion Notification? */ 573 static int sctp_v4_is_ce(const struct sk_buff *skb) 574 { 575 return INET_ECN_is_ce(ip_hdr(skb)->tos); 576 } 577 578 /* Create and initialize a new sk for the socket returned by accept(). */ 579 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 580 struct sctp_association *asoc) 581 { 582 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 583 sk->sk_prot); 584 struct inet_sock *newinet; 585 586 if (!newsk) 587 goto out; 588 589 sock_init_data(NULL, newsk); 590 591 sctp_copy_sock(newsk, sk, asoc); 592 sock_reset_flag(newsk, SOCK_ZAPPED); 593 594 newinet = inet_sk(newsk); 595 596 newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 597 598 sk_refcnt_debug_inc(newsk); 599 600 if (newsk->sk_prot->init(newsk)) { 601 sk_common_release(newsk); 602 newsk = NULL; 603 } 604 605 out: 606 return newsk; 607 } 608 609 /* Map address, empty for v4 family */ 610 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 611 { 612 /* Empty */ 613 } 614 615 /* Dump the v4 addr to the seq file. */ 616 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 617 { 618 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 619 } 620 621 static void sctp_v4_ecn_capable(struct sock *sk) 622 { 623 INET_ECN_xmit(sk); 624 } 625 626 /* Event handler for inet address addition/deletion events. 627 * The sctp_local_addr_list needs to be protocted by a spin lock since 628 * multiple notifiers (say IPv4 and IPv6) may be running at the same 629 * time and thus corrupt the list. 630 * The reader side is protected with RCU. 631 */ 632 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 633 void *ptr) 634 { 635 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 636 struct sctp_sockaddr_entry *addr = NULL; 637 struct sctp_sockaddr_entry *temp; 638 int found = 0; 639 640 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 641 return NOTIFY_DONE; 642 643 switch (ev) { 644 case NETDEV_UP: 645 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 646 if (addr) { 647 addr->a.v4.sin_family = AF_INET; 648 addr->a.v4.sin_port = 0; 649 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 650 addr->valid = 1; 651 spin_lock_bh(&sctp_local_addr_lock); 652 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 653 spin_unlock_bh(&sctp_local_addr_lock); 654 } 655 break; 656 case NETDEV_DOWN: 657 spin_lock_bh(&sctp_local_addr_lock); 658 list_for_each_entry_safe(addr, temp, 659 &sctp_local_addr_list, list) { 660 if (addr->a.sa.sa_family == AF_INET && 661 addr->a.v4.sin_addr.s_addr == 662 ifa->ifa_local) { 663 found = 1; 664 addr->valid = 0; 665 list_del_rcu(&addr->list); 666 break; 667 } 668 } 669 spin_unlock_bh(&sctp_local_addr_lock); 670 if (found) 671 kfree_rcu(addr, rcu); 672 break; 673 } 674 675 return NOTIFY_DONE; 676 } 677 678 /* 679 * Initialize the control inode/socket with a control endpoint data 680 * structure. This endpoint is reserved exclusively for the OOTB processing. 681 */ 682 static int sctp_ctl_sock_init(void) 683 { 684 int err; 685 sa_family_t family = PF_INET; 686 687 if (sctp_get_pf_specific(PF_INET6)) 688 family = PF_INET6; 689 690 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 691 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 692 693 /* If IPv6 socket could not be created, try the IPv4 socket */ 694 if (err < 0 && family == PF_INET6) 695 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 696 SOCK_SEQPACKET, IPPROTO_SCTP, 697 &init_net); 698 699 if (err < 0) { 700 pr_err("Failed to create the SCTP control socket\n"); 701 return err; 702 } 703 return 0; 704 } 705 706 /* Register address family specific functions. */ 707 int sctp_register_af(struct sctp_af *af) 708 { 709 switch (af->sa_family) { 710 case AF_INET: 711 if (sctp_af_v4_specific) 712 return 0; 713 sctp_af_v4_specific = af; 714 break; 715 case AF_INET6: 716 if (sctp_af_v6_specific) 717 return 0; 718 sctp_af_v6_specific = af; 719 break; 720 default: 721 return 0; 722 } 723 724 INIT_LIST_HEAD(&af->list); 725 list_add_tail(&af->list, &sctp_address_families); 726 return 1; 727 } 728 729 /* Get the table of functions for manipulating a particular address 730 * family. 731 */ 732 struct sctp_af *sctp_get_af_specific(sa_family_t family) 733 { 734 switch (family) { 735 case AF_INET: 736 return sctp_af_v4_specific; 737 case AF_INET6: 738 return sctp_af_v6_specific; 739 default: 740 return NULL; 741 } 742 } 743 744 /* Common code to initialize a AF_INET msg_name. */ 745 static void sctp_inet_msgname(char *msgname, int *addr_len) 746 { 747 struct sockaddr_in *sin; 748 749 sin = (struct sockaddr_in *)msgname; 750 *addr_len = sizeof(struct sockaddr_in); 751 sin->sin_family = AF_INET; 752 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 753 } 754 755 /* Copy the primary address of the peer primary address as the msg_name. */ 756 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 757 int *addr_len) 758 { 759 struct sockaddr_in *sin, *sinfrom; 760 761 if (msgname) { 762 struct sctp_association *asoc; 763 764 asoc = event->asoc; 765 sctp_inet_msgname(msgname, addr_len); 766 sin = (struct sockaddr_in *)msgname; 767 sinfrom = &asoc->peer.primary_addr.v4; 768 sin->sin_port = htons(asoc->peer.port); 769 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 770 } 771 } 772 773 /* Initialize and copy out a msgname from an inbound skb. */ 774 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 775 { 776 if (msgname) { 777 struct sctphdr *sh = sctp_hdr(skb); 778 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 779 780 sctp_inet_msgname(msgname, len); 781 sin->sin_port = sh->source; 782 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 783 } 784 } 785 786 /* Do we support this AF? */ 787 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 788 { 789 /* PF_INET only supports AF_INET addresses. */ 790 return AF_INET == family; 791 } 792 793 /* Address matching with wildcards allowed. */ 794 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 795 const union sctp_addr *addr2, 796 struct sctp_sock *opt) 797 { 798 /* PF_INET only supports AF_INET addresses. */ 799 if (addr1->sa.sa_family != addr2->sa.sa_family) 800 return 0; 801 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 802 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 803 return 1; 804 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 805 return 1; 806 807 return 0; 808 } 809 810 /* Verify that provided sockaddr looks bindable. Common verification has 811 * already been taken care of. 812 */ 813 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 814 { 815 return sctp_v4_available(addr, opt); 816 } 817 818 /* Verify that sockaddr looks sendable. Common verification has already 819 * been taken care of. 820 */ 821 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 822 { 823 return 1; 824 } 825 826 /* Fill in Supported Address Type information for INIT and INIT-ACK 827 * chunks. Returns number of addresses supported. 828 */ 829 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 830 __be16 *types) 831 { 832 types[0] = SCTP_PARAM_IPV4_ADDRESS; 833 return 1; 834 } 835 836 /* Wrapper routine that calls the ip transmit routine. */ 837 static inline int sctp_v4_xmit(struct sk_buff *skb, 838 struct sctp_transport *transport) 839 { 840 struct inet_sock *inet = inet_sk(skb->sk); 841 842 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 843 __func__, skb, skb->len, 844 &transport->fl.u.ip4.saddr, 845 &transport->fl.u.ip4.daddr); 846 847 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 848 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 849 850 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 851 return ip_queue_xmit(skb, &transport->fl); 852 } 853 854 static struct sctp_af sctp_af_inet; 855 856 static struct sctp_pf sctp_pf_inet = { 857 .event_msgname = sctp_inet_event_msgname, 858 .skb_msgname = sctp_inet_skb_msgname, 859 .af_supported = sctp_inet_af_supported, 860 .cmp_addr = sctp_inet_cmp_addr, 861 .bind_verify = sctp_inet_bind_verify, 862 .send_verify = sctp_inet_send_verify, 863 .supported_addrs = sctp_inet_supported_addrs, 864 .create_accept_sk = sctp_v4_create_accept_sk, 865 .addr_v4map = sctp_v4_addr_v4map, 866 .af = &sctp_af_inet 867 }; 868 869 /* Notifier for inetaddr addition/deletion events. */ 870 static struct notifier_block sctp_inetaddr_notifier = { 871 .notifier_call = sctp_inetaddr_event, 872 }; 873 874 /* Socket operations. */ 875 static const struct proto_ops inet_seqpacket_ops = { 876 .family = PF_INET, 877 .owner = THIS_MODULE, 878 .release = inet_release, /* Needs to be wrapped... */ 879 .bind = inet_bind, 880 .connect = inet_dgram_connect, 881 .socketpair = sock_no_socketpair, 882 .accept = inet_accept, 883 .getname = inet_getname, /* Semantics are different. */ 884 .poll = sctp_poll, 885 .ioctl = inet_ioctl, 886 .listen = sctp_inet_listen, 887 .shutdown = inet_shutdown, /* Looks harmless. */ 888 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 889 .getsockopt = sock_common_getsockopt, 890 .sendmsg = inet_sendmsg, 891 .recvmsg = sock_common_recvmsg, 892 .mmap = sock_no_mmap, 893 .sendpage = sock_no_sendpage, 894 #ifdef CONFIG_COMPAT 895 .compat_setsockopt = compat_sock_common_setsockopt, 896 .compat_getsockopt = compat_sock_common_getsockopt, 897 #endif 898 }; 899 900 /* Registration with AF_INET family. */ 901 static struct inet_protosw sctp_seqpacket_protosw = { 902 .type = SOCK_SEQPACKET, 903 .protocol = IPPROTO_SCTP, 904 .prot = &sctp_prot, 905 .ops = &inet_seqpacket_ops, 906 .no_check = 0, 907 .flags = SCTP_PROTOSW_FLAG 908 }; 909 static struct inet_protosw sctp_stream_protosw = { 910 .type = SOCK_STREAM, 911 .protocol = IPPROTO_SCTP, 912 .prot = &sctp_prot, 913 .ops = &inet_seqpacket_ops, 914 .no_check = 0, 915 .flags = SCTP_PROTOSW_FLAG 916 }; 917 918 /* Register with IP layer. */ 919 static const struct net_protocol sctp_protocol = { 920 .handler = sctp_rcv, 921 .err_handler = sctp_v4_err, 922 .no_policy = 1, 923 }; 924 925 /* IPv4 address related functions. */ 926 static struct sctp_af sctp_af_inet = { 927 .sa_family = AF_INET, 928 .sctp_xmit = sctp_v4_xmit, 929 .setsockopt = ip_setsockopt, 930 .getsockopt = ip_getsockopt, 931 .get_dst = sctp_v4_get_dst, 932 .get_saddr = sctp_v4_get_saddr, 933 .copy_addrlist = sctp_v4_copy_addrlist, 934 .from_skb = sctp_v4_from_skb, 935 .from_sk = sctp_v4_from_sk, 936 .to_sk_saddr = sctp_v4_to_sk_saddr, 937 .to_sk_daddr = sctp_v4_to_sk_daddr, 938 .from_addr_param = sctp_v4_from_addr_param, 939 .to_addr_param = sctp_v4_to_addr_param, 940 .cmp_addr = sctp_v4_cmp_addr, 941 .addr_valid = sctp_v4_addr_valid, 942 .inaddr_any = sctp_v4_inaddr_any, 943 .is_any = sctp_v4_is_any, 944 .available = sctp_v4_available, 945 .scope = sctp_v4_scope, 946 .skb_iif = sctp_v4_skb_iif, 947 .is_ce = sctp_v4_is_ce, 948 .seq_dump_addr = sctp_v4_seq_dump_addr, 949 .ecn_capable = sctp_v4_ecn_capable, 950 .net_header_len = sizeof(struct iphdr), 951 .sockaddr_len = sizeof(struct sockaddr_in), 952 #ifdef CONFIG_COMPAT 953 .compat_setsockopt = compat_ip_setsockopt, 954 .compat_getsockopt = compat_ip_getsockopt, 955 #endif 956 }; 957 958 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 959 960 switch (family) { 961 case PF_INET: 962 return sctp_pf_inet_specific; 963 case PF_INET6: 964 return sctp_pf_inet6_specific; 965 default: 966 return NULL; 967 } 968 } 969 970 /* Register the PF specific function table. */ 971 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 972 { 973 switch (family) { 974 case PF_INET: 975 if (sctp_pf_inet_specific) 976 return 0; 977 sctp_pf_inet_specific = pf; 978 break; 979 case PF_INET6: 980 if (sctp_pf_inet6_specific) 981 return 0; 982 sctp_pf_inet6_specific = pf; 983 break; 984 default: 985 return 0; 986 } 987 return 1; 988 } 989 990 static inline int init_sctp_mibs(void) 991 { 992 return snmp_mib_init((void __percpu **)sctp_statistics, 993 sizeof(struct sctp_mib), 994 __alignof__(struct sctp_mib)); 995 } 996 997 static inline void cleanup_sctp_mibs(void) 998 { 999 snmp_mib_free((void __percpu **)sctp_statistics); 1000 } 1001 1002 static void sctp_v4_pf_init(void) 1003 { 1004 /* Initialize the SCTP specific PF functions. */ 1005 sctp_register_pf(&sctp_pf_inet, PF_INET); 1006 sctp_register_af(&sctp_af_inet); 1007 } 1008 1009 static void sctp_v4_pf_exit(void) 1010 { 1011 list_del(&sctp_af_inet.list); 1012 } 1013 1014 static int sctp_v4_protosw_init(void) 1015 { 1016 int rc; 1017 1018 rc = proto_register(&sctp_prot, 1); 1019 if (rc) 1020 return rc; 1021 1022 /* Register SCTP(UDP and TCP style) with socket layer. */ 1023 inet_register_protosw(&sctp_seqpacket_protosw); 1024 inet_register_protosw(&sctp_stream_protosw); 1025 1026 return 0; 1027 } 1028 1029 static void sctp_v4_protosw_exit(void) 1030 { 1031 inet_unregister_protosw(&sctp_stream_protosw); 1032 inet_unregister_protosw(&sctp_seqpacket_protosw); 1033 proto_unregister(&sctp_prot); 1034 } 1035 1036 static int sctp_v4_add_protocol(void) 1037 { 1038 /* Register notifier for inet address additions/deletions. */ 1039 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1040 1041 /* Register SCTP with inet layer. */ 1042 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1043 return -EAGAIN; 1044 1045 return 0; 1046 } 1047 1048 static void sctp_v4_del_protocol(void) 1049 { 1050 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1051 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1052 } 1053 1054 /* Initialize the universe into something sensible. */ 1055 SCTP_STATIC __init int sctp_init(void) 1056 { 1057 int i; 1058 int status = -EINVAL; 1059 unsigned long goal; 1060 unsigned long limit; 1061 int max_share; 1062 int order; 1063 1064 /* SCTP_DEBUG sanity check. */ 1065 if (!sctp_sanity_check()) 1066 goto out; 1067 1068 /* Allocate bind_bucket and chunk caches. */ 1069 status = -ENOBUFS; 1070 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1071 sizeof(struct sctp_bind_bucket), 1072 0, SLAB_HWCACHE_ALIGN, 1073 NULL); 1074 if (!sctp_bucket_cachep) 1075 goto out; 1076 1077 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1078 sizeof(struct sctp_chunk), 1079 0, SLAB_HWCACHE_ALIGN, 1080 NULL); 1081 if (!sctp_chunk_cachep) 1082 goto err_chunk_cachep; 1083 1084 /* Allocate and initialise sctp mibs. */ 1085 status = init_sctp_mibs(); 1086 if (status) 1087 goto err_init_mibs; 1088 1089 /* Initialize proc fs directory. */ 1090 status = sctp_proc_init(); 1091 if (status) 1092 goto err_init_proc; 1093 1094 /* Initialize object count debugging. */ 1095 sctp_dbg_objcnt_init(); 1096 1097 /* 1098 * 14. Suggested SCTP Protocol Parameter Values 1099 */ 1100 /* The following protocol parameters are RECOMMENDED: */ 1101 /* RTO.Initial - 3 seconds */ 1102 sctp_rto_initial = SCTP_RTO_INITIAL; 1103 /* RTO.Min - 1 second */ 1104 sctp_rto_min = SCTP_RTO_MIN; 1105 /* RTO.Max - 60 seconds */ 1106 sctp_rto_max = SCTP_RTO_MAX; 1107 /* RTO.Alpha - 1/8 */ 1108 sctp_rto_alpha = SCTP_RTO_ALPHA; 1109 /* RTO.Beta - 1/4 */ 1110 sctp_rto_beta = SCTP_RTO_BETA; 1111 1112 /* Valid.Cookie.Life - 60 seconds */ 1113 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1114 1115 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1116 sctp_cookie_preserve_enable = 1; 1117 1118 /* Max.Burst - 4 */ 1119 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1120 1121 /* Association.Max.Retrans - 10 attempts 1122 * Path.Max.Retrans - 5 attempts (per destination address) 1123 * Max.Init.Retransmits - 8 attempts 1124 */ 1125 sctp_max_retrans_association = 10; 1126 sctp_max_retrans_path = 5; 1127 sctp_max_retrans_init = 8; 1128 1129 /* Sendbuffer growth - do per-socket accounting */ 1130 sctp_sndbuf_policy = 0; 1131 1132 /* Rcvbuffer growth - do per-socket accounting */ 1133 sctp_rcvbuf_policy = 0; 1134 1135 /* HB.interval - 30 seconds */ 1136 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1137 1138 /* delayed SACK timeout */ 1139 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1140 1141 /* Implementation specific variables. */ 1142 1143 /* Initialize default stream count setup information. */ 1144 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1145 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1146 1147 /* Initialize handle used for association ids. */ 1148 idr_init(&sctp_assocs_id); 1149 1150 limit = nr_free_buffer_pages() / 8; 1151 limit = max(limit, 128UL); 1152 sysctl_sctp_mem[0] = limit / 4 * 3; 1153 sysctl_sctp_mem[1] = limit; 1154 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1155 1156 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1157 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1158 max_share = min(4UL*1024*1024, limit); 1159 1160 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1161 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1162 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1163 1164 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1165 sysctl_sctp_wmem[1] = 16*1024; 1166 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1167 1168 /* Size and allocate the association hash table. 1169 * The methodology is similar to that of the tcp hash tables. 1170 */ 1171 if (totalram_pages >= (128 * 1024)) 1172 goal = totalram_pages >> (22 - PAGE_SHIFT); 1173 else 1174 goal = totalram_pages >> (24 - PAGE_SHIFT); 1175 1176 for (order = 0; (1UL << order) < goal; order++) 1177 ; 1178 1179 do { 1180 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1181 sizeof(struct sctp_hashbucket); 1182 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1183 continue; 1184 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1185 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1186 } while (!sctp_assoc_hashtable && --order > 0); 1187 if (!sctp_assoc_hashtable) { 1188 pr_err("Failed association hash alloc\n"); 1189 status = -ENOMEM; 1190 goto err_ahash_alloc; 1191 } 1192 for (i = 0; i < sctp_assoc_hashsize; i++) { 1193 rwlock_init(&sctp_assoc_hashtable[i].lock); 1194 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1195 } 1196 1197 /* Allocate and initialize the endpoint hash table. */ 1198 sctp_ep_hashsize = 64; 1199 sctp_ep_hashtable = (struct sctp_hashbucket *) 1200 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1201 if (!sctp_ep_hashtable) { 1202 pr_err("Failed endpoint_hash alloc\n"); 1203 status = -ENOMEM; 1204 goto err_ehash_alloc; 1205 } 1206 for (i = 0; i < sctp_ep_hashsize; i++) { 1207 rwlock_init(&sctp_ep_hashtable[i].lock); 1208 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1209 } 1210 1211 /* Allocate and initialize the SCTP port hash table. */ 1212 do { 1213 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1214 sizeof(struct sctp_bind_hashbucket); 1215 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1216 continue; 1217 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1218 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order); 1219 } while (!sctp_port_hashtable && --order > 0); 1220 if (!sctp_port_hashtable) { 1221 pr_err("Failed bind hash alloc\n"); 1222 status = -ENOMEM; 1223 goto err_bhash_alloc; 1224 } 1225 for (i = 0; i < sctp_port_hashsize; i++) { 1226 spin_lock_init(&sctp_port_hashtable[i].lock); 1227 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1228 } 1229 1230 pr_info("Hash tables configured (established %d bind %d)\n", 1231 sctp_assoc_hashsize, sctp_port_hashsize); 1232 1233 /* Disable ADDIP by default. */ 1234 sctp_addip_enable = 0; 1235 sctp_addip_noauth = 0; 1236 1237 /* Enable PR-SCTP by default. */ 1238 sctp_prsctp_enable = 1; 1239 1240 /* Disable AUTH by default. */ 1241 sctp_auth_enable = 0; 1242 1243 /* Set SCOPE policy to enabled */ 1244 sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE; 1245 1246 /* Set the default rwnd update threshold */ 1247 sctp_rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT; 1248 1249 sctp_sysctl_register(); 1250 1251 INIT_LIST_HEAD(&sctp_address_families); 1252 sctp_v4_pf_init(); 1253 sctp_v6_pf_init(); 1254 1255 /* Initialize the local address list. */ 1256 INIT_LIST_HEAD(&sctp_local_addr_list); 1257 spin_lock_init(&sctp_local_addr_lock); 1258 sctp_get_local_addr_list(); 1259 1260 status = sctp_v4_protosw_init(); 1261 1262 if (status) 1263 goto err_protosw_init; 1264 1265 status = sctp_v6_protosw_init(); 1266 if (status) 1267 goto err_v6_protosw_init; 1268 1269 /* Initialize the control inode/socket for handling OOTB packets. */ 1270 if ((status = sctp_ctl_sock_init())) { 1271 pr_err("Failed to initialize the SCTP control sock\n"); 1272 goto err_ctl_sock_init; 1273 } 1274 1275 status = sctp_v4_add_protocol(); 1276 if (status) 1277 goto err_add_protocol; 1278 1279 /* Register SCTP with inet6 layer. */ 1280 status = sctp_v6_add_protocol(); 1281 if (status) 1282 goto err_v6_add_protocol; 1283 1284 status = 0; 1285 out: 1286 return status; 1287 err_v6_add_protocol: 1288 sctp_v4_del_protocol(); 1289 err_add_protocol: 1290 inet_ctl_sock_destroy(sctp_ctl_sock); 1291 err_ctl_sock_init: 1292 sctp_v6_protosw_exit(); 1293 err_v6_protosw_init: 1294 sctp_v4_protosw_exit(); 1295 err_protosw_init: 1296 sctp_free_local_addr_list(); 1297 sctp_v4_pf_exit(); 1298 sctp_v6_pf_exit(); 1299 sctp_sysctl_unregister(); 1300 free_pages((unsigned long)sctp_port_hashtable, 1301 get_order(sctp_port_hashsize * 1302 sizeof(struct sctp_bind_hashbucket))); 1303 err_bhash_alloc: 1304 kfree(sctp_ep_hashtable); 1305 err_ehash_alloc: 1306 free_pages((unsigned long)sctp_assoc_hashtable, 1307 get_order(sctp_assoc_hashsize * 1308 sizeof(struct sctp_hashbucket))); 1309 err_ahash_alloc: 1310 sctp_dbg_objcnt_exit(); 1311 sctp_proc_exit(); 1312 err_init_proc: 1313 cleanup_sctp_mibs(); 1314 err_init_mibs: 1315 kmem_cache_destroy(sctp_chunk_cachep); 1316 err_chunk_cachep: 1317 kmem_cache_destroy(sctp_bucket_cachep); 1318 goto out; 1319 } 1320 1321 /* Exit handler for the SCTP protocol. */ 1322 SCTP_STATIC __exit void sctp_exit(void) 1323 { 1324 /* BUG. This should probably do something useful like clean 1325 * up all the remaining associations and all that memory. 1326 */ 1327 1328 /* Unregister with inet6/inet layers. */ 1329 sctp_v6_del_protocol(); 1330 sctp_v4_del_protocol(); 1331 1332 /* Free the control endpoint. */ 1333 inet_ctl_sock_destroy(sctp_ctl_sock); 1334 1335 /* Free protosw registrations */ 1336 sctp_v6_protosw_exit(); 1337 sctp_v4_protosw_exit(); 1338 1339 /* Free the local address list. */ 1340 sctp_free_local_addr_list(); 1341 1342 /* Unregister with socket layer. */ 1343 sctp_v6_pf_exit(); 1344 sctp_v4_pf_exit(); 1345 1346 sctp_sysctl_unregister(); 1347 1348 free_pages((unsigned long)sctp_assoc_hashtable, 1349 get_order(sctp_assoc_hashsize * 1350 sizeof(struct sctp_hashbucket))); 1351 kfree(sctp_ep_hashtable); 1352 free_pages((unsigned long)sctp_port_hashtable, 1353 get_order(sctp_port_hashsize * 1354 sizeof(struct sctp_bind_hashbucket))); 1355 1356 sctp_dbg_objcnt_exit(); 1357 sctp_proc_exit(); 1358 cleanup_sctp_mibs(); 1359 1360 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1361 1362 kmem_cache_destroy(sctp_chunk_cachep); 1363 kmem_cache_destroy(sctp_bucket_cachep); 1364 } 1365 1366 module_init(sctp_init); 1367 module_exit(sctp_exit); 1368 1369 /* 1370 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1371 */ 1372 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1373 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1374 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1375 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1376 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1377 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1378 MODULE_LICENSE("GPL"); 1379