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 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net); 110 if (!proc_net_sctp) 111 goto out_free_percpu; 112 } 113 114 if (sctp_snmp_proc_init()) 115 goto out_snmp_proc_init; 116 if (sctp_eps_proc_init()) 117 goto out_eps_proc_init; 118 if (sctp_assocs_proc_init()) 119 goto out_assocs_proc_init; 120 if (sctp_remaddr_proc_init()) 121 goto out_remaddr_proc_init; 122 123 return 0; 124 125 out_remaddr_proc_init: 126 sctp_assocs_proc_exit(); 127 out_assocs_proc_init: 128 sctp_eps_proc_exit(); 129 out_eps_proc_init: 130 sctp_snmp_proc_exit(); 131 out_snmp_proc_init: 132 if (proc_net_sctp) { 133 proc_net_sctp = NULL; 134 remove_proc_entry("sctp", init_net.proc_net); 135 } 136 out_free_percpu: 137 percpu_counter_destroy(&sctp_sockets_allocated); 138 #else 139 return 0; 140 #endif /* CONFIG_PROC_FS */ 141 142 out_nomem: 143 return -ENOMEM; 144 } 145 146 /* Clean up the proc fs entry for the SCTP protocol. 147 * Note: Do not make this __exit as it is used in the init error 148 * path. 149 */ 150 static void sctp_proc_exit(void) 151 { 152 #ifdef CONFIG_PROC_FS 153 sctp_snmp_proc_exit(); 154 sctp_eps_proc_exit(); 155 sctp_assocs_proc_exit(); 156 sctp_remaddr_proc_exit(); 157 158 if (proc_net_sctp) { 159 proc_net_sctp = NULL; 160 remove_proc_entry("sctp", init_net.proc_net); 161 } 162 #endif 163 percpu_counter_destroy(&sctp_sockets_allocated); 164 } 165 166 /* Private helper to extract ipv4 address and stash them in 167 * the protocol structure. 168 */ 169 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 170 struct net_device *dev) 171 { 172 struct in_device *in_dev; 173 struct in_ifaddr *ifa; 174 struct sctp_sockaddr_entry *addr; 175 176 rcu_read_lock(); 177 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 178 rcu_read_unlock(); 179 return; 180 } 181 182 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 183 /* Add the address to the local list. */ 184 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 185 if (addr) { 186 addr->a.v4.sin_family = AF_INET; 187 addr->a.v4.sin_port = 0; 188 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 189 addr->valid = 1; 190 INIT_LIST_HEAD(&addr->list); 191 INIT_RCU_HEAD(&addr->rcu); 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 read_lock(&dev_base_lock); 209 for_each_netdev(&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 read_unlock(&dev_base_lock); 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)->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)->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)->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 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 436 { 437 sctp_scope_t retval; 438 439 /* Should IPv4 scoping be a sysctl configurable option 440 * so users can turn it off (default on) for certain 441 * unconventional networking environments? 442 */ 443 444 /* Check for unusable SCTP addresses. */ 445 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) { 446 retval = SCTP_SCOPE_UNUSABLE; 447 } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) { 448 retval = SCTP_SCOPE_LOOPBACK; 449 } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) { 450 retval = SCTP_SCOPE_LINK; 451 } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) || 452 ipv4_is_private_172(addr->v4.sin_addr.s_addr) || 453 ipv4_is_private_192(addr->v4.sin_addr.s_addr)) { 454 retval = SCTP_SCOPE_PRIVATE; 455 } else { 456 retval = SCTP_SCOPE_GLOBAL; 457 } 458 459 return retval; 460 } 461 462 /* Returns a valid dst cache entry for the given source and destination ip 463 * addresses. If an association is passed, trys to get a dst entry with a 464 * source address that matches an address in the bind address list. 465 */ 466 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc, 467 union sctp_addr *daddr, 468 union sctp_addr *saddr) 469 { 470 struct rtable *rt; 471 struct flowi fl; 472 struct sctp_bind_addr *bp; 473 struct sctp_sockaddr_entry *laddr; 474 struct dst_entry *dst = NULL; 475 union sctp_addr dst_saddr; 476 477 memset(&fl, 0x0, sizeof(struct flowi)); 478 fl.fl4_dst = daddr->v4.sin_addr.s_addr; 479 fl.proto = IPPROTO_SCTP; 480 if (asoc) { 481 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk); 482 fl.oif = asoc->base.sk->sk_bound_dev_if; 483 } 484 if (saddr) 485 fl.fl4_src = saddr->v4.sin_addr.s_addr; 486 487 SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ", 488 __func__, &fl.fl4_dst, &fl.fl4_src); 489 490 if (!ip_route_output_key(&init_net, &rt, &fl)) { 491 dst = &rt->u.dst; 492 } 493 494 /* If there is no association or if a source address is passed, no 495 * more validation is required. 496 */ 497 if (!asoc || saddr) 498 goto out; 499 500 bp = &asoc->base.bind_addr; 501 502 if (dst) { 503 /* Walk through the bind address list and look for a bind 504 * address that matches the source address of the returned dst. 505 */ 506 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 507 rcu_read_lock(); 508 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 509 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 510 continue; 511 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 512 goto out_unlock; 513 } 514 rcu_read_unlock(); 515 516 /* None of the bound addresses match the source address of the 517 * dst. So release it. 518 */ 519 dst_release(dst); 520 dst = NULL; 521 } 522 523 /* Walk through the bind address list and try to get a dst that 524 * matches a bind address as the source address. 525 */ 526 rcu_read_lock(); 527 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 528 if (!laddr->valid) 529 continue; 530 if ((laddr->state == SCTP_ADDR_SRC) && 531 (AF_INET == laddr->a.sa.sa_family)) { 532 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 533 if (!ip_route_output_key(&init_net, &rt, &fl)) { 534 dst = &rt->u.dst; 535 goto out_unlock; 536 } 537 } 538 } 539 540 out_unlock: 541 rcu_read_unlock(); 542 out: 543 if (dst) 544 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n", 545 &rt->rt_dst, &rt->rt_src); 546 else 547 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 548 549 return dst; 550 } 551 552 /* For v4, the source address is cached in the route entry(dst). So no need 553 * to cache it separately and hence this is an empty routine. 554 */ 555 static void sctp_v4_get_saddr(struct sctp_sock *sk, 556 struct sctp_association *asoc, 557 struct dst_entry *dst, 558 union sctp_addr *daddr, 559 union sctp_addr *saddr) 560 { 561 struct rtable *rt = (struct rtable *)dst; 562 563 if (!asoc) 564 return; 565 566 if (rt) { 567 saddr->v4.sin_family = AF_INET; 568 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 569 saddr->v4.sin_addr.s_addr = rt->rt_src; 570 } 571 } 572 573 /* What interface did this skb arrive on? */ 574 static int sctp_v4_skb_iif(const struct sk_buff *skb) 575 { 576 return skb_rtable(skb)->rt_iif; 577 } 578 579 /* Was this packet marked by Explicit Congestion Notification? */ 580 static int sctp_v4_is_ce(const struct sk_buff *skb) 581 { 582 return INET_ECN_is_ce(ip_hdr(skb)->tos); 583 } 584 585 /* Create and initialize a new sk for the socket returned by accept(). */ 586 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 587 struct sctp_association *asoc) 588 { 589 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 590 sk->sk_prot); 591 struct inet_sock *newinet; 592 593 if (!newsk) 594 goto out; 595 596 sock_init_data(NULL, newsk); 597 598 sctp_copy_sock(newsk, sk, asoc); 599 sock_reset_flag(newsk, SOCK_ZAPPED); 600 601 newinet = inet_sk(newsk); 602 603 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 604 605 sk_refcnt_debug_inc(newsk); 606 607 if (newsk->sk_prot->init(newsk)) { 608 sk_common_release(newsk); 609 newsk = NULL; 610 } 611 612 out: 613 return newsk; 614 } 615 616 /* Map address, empty for v4 family */ 617 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 618 { 619 /* Empty */ 620 } 621 622 /* Dump the v4 addr to the seq file. */ 623 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 624 { 625 seq_printf(seq, "%pI4 ", &addr->v4.sin_addr); 626 } 627 628 static void sctp_v4_ecn_capable(struct sock *sk) 629 { 630 INET_ECN_xmit(sk); 631 } 632 633 /* Event handler for inet address addition/deletion events. 634 * The sctp_local_addr_list needs to be protocted by a spin lock since 635 * multiple notifiers (say IPv4 and IPv6) may be running at the same 636 * time and thus corrupt the list. 637 * The reader side is protected with RCU. 638 */ 639 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 640 void *ptr) 641 { 642 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 643 struct sctp_sockaddr_entry *addr = NULL; 644 struct sctp_sockaddr_entry *temp; 645 int found = 0; 646 647 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 648 return NOTIFY_DONE; 649 650 switch (ev) { 651 case NETDEV_UP: 652 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 653 if (addr) { 654 addr->a.v4.sin_family = AF_INET; 655 addr->a.v4.sin_port = 0; 656 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 657 addr->valid = 1; 658 spin_lock_bh(&sctp_local_addr_lock); 659 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 660 spin_unlock_bh(&sctp_local_addr_lock); 661 } 662 break; 663 case NETDEV_DOWN: 664 spin_lock_bh(&sctp_local_addr_lock); 665 list_for_each_entry_safe(addr, temp, 666 &sctp_local_addr_list, list) { 667 if (addr->a.sa.sa_family == AF_INET && 668 addr->a.v4.sin_addr.s_addr == 669 ifa->ifa_local) { 670 found = 1; 671 addr->valid = 0; 672 list_del_rcu(&addr->list); 673 break; 674 } 675 } 676 spin_unlock_bh(&sctp_local_addr_lock); 677 if (found) 678 call_rcu(&addr->rcu, sctp_local_addr_free); 679 break; 680 } 681 682 return NOTIFY_DONE; 683 } 684 685 /* 686 * Initialize the control inode/socket with a control endpoint data 687 * structure. This endpoint is reserved exclusively for the OOTB processing. 688 */ 689 static int sctp_ctl_sock_init(void) 690 { 691 int err; 692 sa_family_t family = PF_INET; 693 694 if (sctp_get_pf_specific(PF_INET6)) 695 family = PF_INET6; 696 697 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 698 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 699 700 /* If IPv6 socket could not be created, try the IPv4 socket */ 701 if (err < 0 && family == PF_INET6) 702 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET, 703 SOCK_SEQPACKET, IPPROTO_SCTP, 704 &init_net); 705 706 if (err < 0) { 707 printk(KERN_ERR 708 "SCTP: Failed to create the SCTP control socket.\n"); 709 return err; 710 } 711 return 0; 712 } 713 714 /* Register address family specific functions. */ 715 int sctp_register_af(struct sctp_af *af) 716 { 717 switch (af->sa_family) { 718 case AF_INET: 719 if (sctp_af_v4_specific) 720 return 0; 721 sctp_af_v4_specific = af; 722 break; 723 case AF_INET6: 724 if (sctp_af_v6_specific) 725 return 0; 726 sctp_af_v6_specific = af; 727 break; 728 default: 729 return 0; 730 } 731 732 INIT_LIST_HEAD(&af->list); 733 list_add_tail(&af->list, &sctp_address_families); 734 return 1; 735 } 736 737 /* Get the table of functions for manipulating a particular address 738 * family. 739 */ 740 struct sctp_af *sctp_get_af_specific(sa_family_t family) 741 { 742 switch (family) { 743 case AF_INET: 744 return sctp_af_v4_specific; 745 case AF_INET6: 746 return sctp_af_v6_specific; 747 default: 748 return NULL; 749 } 750 } 751 752 /* Common code to initialize a AF_INET msg_name. */ 753 static void sctp_inet_msgname(char *msgname, int *addr_len) 754 { 755 struct sockaddr_in *sin; 756 757 sin = (struct sockaddr_in *)msgname; 758 *addr_len = sizeof(struct sockaddr_in); 759 sin->sin_family = AF_INET; 760 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 761 } 762 763 /* Copy the primary address of the peer primary address as the msg_name. */ 764 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 765 int *addr_len) 766 { 767 struct sockaddr_in *sin, *sinfrom; 768 769 if (msgname) { 770 struct sctp_association *asoc; 771 772 asoc = event->asoc; 773 sctp_inet_msgname(msgname, addr_len); 774 sin = (struct sockaddr_in *)msgname; 775 sinfrom = &asoc->peer.primary_addr.v4; 776 sin->sin_port = htons(asoc->peer.port); 777 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 778 } 779 } 780 781 /* Initialize and copy out a msgname from an inbound skb. */ 782 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 783 { 784 if (msgname) { 785 struct sctphdr *sh = sctp_hdr(skb); 786 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 787 788 sctp_inet_msgname(msgname, len); 789 sin->sin_port = sh->source; 790 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 791 } 792 } 793 794 /* Do we support this AF? */ 795 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 796 { 797 /* PF_INET only supports AF_INET addresses. */ 798 return (AF_INET == family); 799 } 800 801 /* Address matching with wildcards allowed. */ 802 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 803 const union sctp_addr *addr2, 804 struct sctp_sock *opt) 805 { 806 /* PF_INET only supports AF_INET addresses. */ 807 if (addr1->sa.sa_family != addr2->sa.sa_family) 808 return 0; 809 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 810 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 811 return 1; 812 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 813 return 1; 814 815 return 0; 816 } 817 818 /* Verify that provided sockaddr looks bindable. Common verification has 819 * already been taken care of. 820 */ 821 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 822 { 823 return sctp_v4_available(addr, opt); 824 } 825 826 /* Verify that sockaddr looks sendable. Common verification has already 827 * been taken care of. 828 */ 829 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 830 { 831 return 1; 832 } 833 834 /* Fill in Supported Address Type information for INIT and INIT-ACK 835 * chunks. Returns number of addresses supported. 836 */ 837 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 838 __be16 *types) 839 { 840 types[0] = SCTP_PARAM_IPV4_ADDRESS; 841 return 1; 842 } 843 844 /* Wrapper routine that calls the ip transmit routine. */ 845 static inline int sctp_v4_xmit(struct sk_buff *skb, 846 struct sctp_transport *transport) 847 { 848 struct inet_sock *inet = inet_sk(skb->sk); 849 850 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", 851 __func__, skb, skb->len, 852 &skb_rtable(skb)->rt_src, 853 &skb_rtable(skb)->rt_dst); 854 855 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 856 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 857 858 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 859 return ip_queue_xmit(skb, 0); 860 } 861 862 static struct sctp_af sctp_af_inet; 863 864 static struct sctp_pf sctp_pf_inet = { 865 .event_msgname = sctp_inet_event_msgname, 866 .skb_msgname = sctp_inet_skb_msgname, 867 .af_supported = sctp_inet_af_supported, 868 .cmp_addr = sctp_inet_cmp_addr, 869 .bind_verify = sctp_inet_bind_verify, 870 .send_verify = sctp_inet_send_verify, 871 .supported_addrs = sctp_inet_supported_addrs, 872 .create_accept_sk = sctp_v4_create_accept_sk, 873 .addr_v4map = sctp_v4_addr_v4map, 874 .af = &sctp_af_inet 875 }; 876 877 /* Notifier for inetaddr addition/deletion events. */ 878 static struct notifier_block sctp_inetaddr_notifier = { 879 .notifier_call = sctp_inetaddr_event, 880 }; 881 882 /* Socket operations. */ 883 static const struct proto_ops inet_seqpacket_ops = { 884 .family = PF_INET, 885 .owner = THIS_MODULE, 886 .release = inet_release, /* Needs to be wrapped... */ 887 .bind = inet_bind, 888 .connect = inet_dgram_connect, 889 .socketpair = sock_no_socketpair, 890 .accept = inet_accept, 891 .getname = inet_getname, /* Semantics are different. */ 892 .poll = sctp_poll, 893 .ioctl = inet_ioctl, 894 .listen = sctp_inet_listen, 895 .shutdown = inet_shutdown, /* Looks harmless. */ 896 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 897 .getsockopt = sock_common_getsockopt, 898 .sendmsg = inet_sendmsg, 899 .recvmsg = sock_common_recvmsg, 900 .mmap = sock_no_mmap, 901 .sendpage = sock_no_sendpage, 902 #ifdef CONFIG_COMPAT 903 .compat_setsockopt = compat_sock_common_setsockopt, 904 .compat_getsockopt = compat_sock_common_getsockopt, 905 #endif 906 }; 907 908 /* Registration with AF_INET family. */ 909 static struct inet_protosw sctp_seqpacket_protosw = { 910 .type = SOCK_SEQPACKET, 911 .protocol = IPPROTO_SCTP, 912 .prot = &sctp_prot, 913 .ops = &inet_seqpacket_ops, 914 .capability = -1, 915 .no_check = 0, 916 .flags = SCTP_PROTOSW_FLAG 917 }; 918 static struct inet_protosw sctp_stream_protosw = { 919 .type = SOCK_STREAM, 920 .protocol = IPPROTO_SCTP, 921 .prot = &sctp_prot, 922 .ops = &inet_seqpacket_ops, 923 .capability = -1, 924 .no_check = 0, 925 .flags = SCTP_PROTOSW_FLAG 926 }; 927 928 /* Register with IP layer. */ 929 static struct net_protocol sctp_protocol = { 930 .handler = sctp_rcv, 931 .err_handler = sctp_v4_err, 932 .no_policy = 1, 933 }; 934 935 /* IPv4 address related functions. */ 936 static struct sctp_af sctp_af_inet = { 937 .sa_family = AF_INET, 938 .sctp_xmit = sctp_v4_xmit, 939 .setsockopt = ip_setsockopt, 940 .getsockopt = ip_getsockopt, 941 .get_dst = sctp_v4_get_dst, 942 .get_saddr = sctp_v4_get_saddr, 943 .copy_addrlist = sctp_v4_copy_addrlist, 944 .from_skb = sctp_v4_from_skb, 945 .from_sk = sctp_v4_from_sk, 946 .to_sk_saddr = sctp_v4_to_sk_saddr, 947 .to_sk_daddr = sctp_v4_to_sk_daddr, 948 .from_addr_param = sctp_v4_from_addr_param, 949 .to_addr_param = sctp_v4_to_addr_param, 950 .dst_saddr = sctp_v4_dst_saddr, 951 .cmp_addr = sctp_v4_cmp_addr, 952 .addr_valid = sctp_v4_addr_valid, 953 .inaddr_any = sctp_v4_inaddr_any, 954 .is_any = sctp_v4_is_any, 955 .available = sctp_v4_available, 956 .scope = sctp_v4_scope, 957 .skb_iif = sctp_v4_skb_iif, 958 .is_ce = sctp_v4_is_ce, 959 .seq_dump_addr = sctp_v4_seq_dump_addr, 960 .ecn_capable = sctp_v4_ecn_capable, 961 .net_header_len = sizeof(struct iphdr), 962 .sockaddr_len = sizeof(struct sockaddr_in), 963 #ifdef CONFIG_COMPAT 964 .compat_setsockopt = compat_ip_setsockopt, 965 .compat_getsockopt = compat_ip_getsockopt, 966 #endif 967 }; 968 969 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 970 971 switch (family) { 972 case PF_INET: 973 return sctp_pf_inet_specific; 974 case PF_INET6: 975 return sctp_pf_inet6_specific; 976 default: 977 return NULL; 978 } 979 } 980 981 /* Register the PF specific function table. */ 982 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 983 { 984 switch (family) { 985 case PF_INET: 986 if (sctp_pf_inet_specific) 987 return 0; 988 sctp_pf_inet_specific = pf; 989 break; 990 case PF_INET6: 991 if (sctp_pf_inet6_specific) 992 return 0; 993 sctp_pf_inet6_specific = pf; 994 break; 995 default: 996 return 0; 997 } 998 return 1; 999 } 1000 1001 static inline int init_sctp_mibs(void) 1002 { 1003 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); 1004 } 1005 1006 static inline void cleanup_sctp_mibs(void) 1007 { 1008 snmp_mib_free((void**)sctp_statistics); 1009 } 1010 1011 static void sctp_v4_pf_init(void) 1012 { 1013 /* Initialize the SCTP specific PF functions. */ 1014 sctp_register_pf(&sctp_pf_inet, PF_INET); 1015 sctp_register_af(&sctp_af_inet); 1016 } 1017 1018 static void sctp_v4_pf_exit(void) 1019 { 1020 list_del(&sctp_af_inet.list); 1021 } 1022 1023 static int sctp_v4_protosw_init(void) 1024 { 1025 int rc; 1026 1027 rc = proto_register(&sctp_prot, 1); 1028 if (rc) 1029 return rc; 1030 1031 /* Register SCTP(UDP and TCP style) with socket layer. */ 1032 inet_register_protosw(&sctp_seqpacket_protosw); 1033 inet_register_protosw(&sctp_stream_protosw); 1034 1035 return 0; 1036 } 1037 1038 static void sctp_v4_protosw_exit(void) 1039 { 1040 inet_unregister_protosw(&sctp_stream_protosw); 1041 inet_unregister_protosw(&sctp_seqpacket_protosw); 1042 proto_unregister(&sctp_prot); 1043 } 1044 1045 static int sctp_v4_add_protocol(void) 1046 { 1047 /* Register notifier for inet address additions/deletions. */ 1048 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1049 1050 /* Register SCTP with inet layer. */ 1051 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1052 return -EAGAIN; 1053 1054 return 0; 1055 } 1056 1057 static void sctp_v4_del_protocol(void) 1058 { 1059 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1060 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1061 } 1062 1063 /* Initialize the universe into something sensible. */ 1064 SCTP_STATIC __init int sctp_init(void) 1065 { 1066 int i; 1067 int status = -EINVAL; 1068 unsigned long goal; 1069 unsigned long limit; 1070 unsigned long nr_pages; 1071 int max_share; 1072 int order; 1073 1074 /* SCTP_DEBUG sanity check. */ 1075 if (!sctp_sanity_check()) 1076 goto out; 1077 1078 /* Allocate bind_bucket and chunk caches. */ 1079 status = -ENOBUFS; 1080 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1081 sizeof(struct sctp_bind_bucket), 1082 0, SLAB_HWCACHE_ALIGN, 1083 NULL); 1084 if (!sctp_bucket_cachep) 1085 goto out; 1086 1087 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1088 sizeof(struct sctp_chunk), 1089 0, SLAB_HWCACHE_ALIGN, 1090 NULL); 1091 if (!sctp_chunk_cachep) 1092 goto err_chunk_cachep; 1093 1094 /* Allocate and initialise sctp mibs. */ 1095 status = init_sctp_mibs(); 1096 if (status) 1097 goto err_init_mibs; 1098 1099 /* Initialize proc fs directory. */ 1100 status = sctp_proc_init(); 1101 if (status) 1102 goto err_init_proc; 1103 1104 /* Initialize object count debugging. */ 1105 sctp_dbg_objcnt_init(); 1106 1107 /* 1108 * 14. Suggested SCTP Protocol Parameter Values 1109 */ 1110 /* The following protocol parameters are RECOMMENDED: */ 1111 /* RTO.Initial - 3 seconds */ 1112 sctp_rto_initial = SCTP_RTO_INITIAL; 1113 /* RTO.Min - 1 second */ 1114 sctp_rto_min = SCTP_RTO_MIN; 1115 /* RTO.Max - 60 seconds */ 1116 sctp_rto_max = SCTP_RTO_MAX; 1117 /* RTO.Alpha - 1/8 */ 1118 sctp_rto_alpha = SCTP_RTO_ALPHA; 1119 /* RTO.Beta - 1/4 */ 1120 sctp_rto_beta = SCTP_RTO_BETA; 1121 1122 /* Valid.Cookie.Life - 60 seconds */ 1123 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1124 1125 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1126 sctp_cookie_preserve_enable = 1; 1127 1128 /* Max.Burst - 4 */ 1129 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1130 1131 /* Association.Max.Retrans - 10 attempts 1132 * Path.Max.Retrans - 5 attempts (per destination address) 1133 * Max.Init.Retransmits - 8 attempts 1134 */ 1135 sctp_max_retrans_association = 10; 1136 sctp_max_retrans_path = 5; 1137 sctp_max_retrans_init = 8; 1138 1139 /* Sendbuffer growth - do per-socket accounting */ 1140 sctp_sndbuf_policy = 0; 1141 1142 /* Rcvbuffer growth - do per-socket accounting */ 1143 sctp_rcvbuf_policy = 0; 1144 1145 /* HB.interval - 30 seconds */ 1146 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1147 1148 /* delayed SACK timeout */ 1149 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1150 1151 /* Implementation specific variables. */ 1152 1153 /* Initialize default stream count setup information. */ 1154 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1155 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1156 1157 /* Initialize handle used for association ids. */ 1158 idr_init(&sctp_assocs_id); 1159 1160 /* Set the pressure threshold to be a fraction of global memory that 1161 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1162 * memory, with a floor of 128 pages. 1163 * Note this initalizes the data in sctpv6_prot too 1164 * Unabashedly stolen from tcp_init 1165 */ 1166 nr_pages = totalram_pages - totalhigh_pages; 1167 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1168 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1169 limit = max(limit, 128UL); 1170 sysctl_sctp_mem[0] = limit / 4 * 3; 1171 sysctl_sctp_mem[1] = limit; 1172 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1173 1174 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1175 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1176 max_share = min(4UL*1024*1024, limit); 1177 1178 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1179 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1180 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1181 1182 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1183 sysctl_sctp_wmem[1] = 16*1024; 1184 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1185 1186 /* Size and allocate the association hash table. 1187 * The methodology is similar to that of the tcp hash tables. 1188 */ 1189 if (num_physpages >= (128 * 1024)) 1190 goal = num_physpages >> (22 - PAGE_SHIFT); 1191 else 1192 goal = num_physpages >> (24 - PAGE_SHIFT); 1193 1194 for (order = 0; (1UL << order) < goal; order++) 1195 ; 1196 1197 do { 1198 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1199 sizeof(struct sctp_hashbucket); 1200 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1201 continue; 1202 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1203 __get_free_pages(GFP_ATOMIC, order); 1204 } while (!sctp_assoc_hashtable && --order > 0); 1205 if (!sctp_assoc_hashtable) { 1206 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1207 status = -ENOMEM; 1208 goto err_ahash_alloc; 1209 } 1210 for (i = 0; i < sctp_assoc_hashsize; i++) { 1211 rwlock_init(&sctp_assoc_hashtable[i].lock); 1212 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1213 } 1214 1215 /* Allocate and initialize the endpoint hash table. */ 1216 sctp_ep_hashsize = 64; 1217 sctp_ep_hashtable = (struct sctp_hashbucket *) 1218 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1219 if (!sctp_ep_hashtable) { 1220 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1221 status = -ENOMEM; 1222 goto err_ehash_alloc; 1223 } 1224 for (i = 0; i < sctp_ep_hashsize; i++) { 1225 rwlock_init(&sctp_ep_hashtable[i].lock); 1226 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1227 } 1228 1229 /* Allocate and initialize the SCTP port hash table. */ 1230 do { 1231 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1232 sizeof(struct sctp_bind_hashbucket); 1233 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1234 continue; 1235 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1236 __get_free_pages(GFP_ATOMIC, order); 1237 } while (!sctp_port_hashtable && --order > 0); 1238 if (!sctp_port_hashtable) { 1239 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1240 status = -ENOMEM; 1241 goto err_bhash_alloc; 1242 } 1243 for (i = 0; i < sctp_port_hashsize; i++) { 1244 spin_lock_init(&sctp_port_hashtable[i].lock); 1245 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1246 } 1247 1248 printk(KERN_INFO "SCTP: Hash tables configured " 1249 "(established %d bind %d)\n", 1250 sctp_assoc_hashsize, sctp_port_hashsize); 1251 1252 /* Disable ADDIP by default. */ 1253 sctp_addip_enable = 0; 1254 sctp_addip_noauth = 0; 1255 1256 /* Enable PR-SCTP by default. */ 1257 sctp_prsctp_enable = 1; 1258 1259 /* Disable AUTH by default. */ 1260 sctp_auth_enable = 0; 1261 1262 sctp_sysctl_register(); 1263 1264 INIT_LIST_HEAD(&sctp_address_families); 1265 sctp_v4_pf_init(); 1266 sctp_v6_pf_init(); 1267 1268 /* Initialize the local address list. */ 1269 INIT_LIST_HEAD(&sctp_local_addr_list); 1270 spin_lock_init(&sctp_local_addr_lock); 1271 sctp_get_local_addr_list(); 1272 1273 status = sctp_v4_protosw_init(); 1274 1275 if (status) 1276 goto err_protosw_init; 1277 1278 status = sctp_v6_protosw_init(); 1279 if (status) 1280 goto err_v6_protosw_init; 1281 1282 /* Initialize the control inode/socket for handling OOTB packets. */ 1283 if ((status = sctp_ctl_sock_init())) { 1284 printk (KERN_ERR 1285 "SCTP: Failed to initialize the SCTP control sock.\n"); 1286 goto err_ctl_sock_init; 1287 } 1288 1289 status = sctp_v4_add_protocol(); 1290 if (status) 1291 goto err_add_protocol; 1292 1293 /* Register SCTP with inet6 layer. */ 1294 status = sctp_v6_add_protocol(); 1295 if (status) 1296 goto err_v6_add_protocol; 1297 1298 status = 0; 1299 out: 1300 return status; 1301 err_v6_add_protocol: 1302 sctp_v4_del_protocol(); 1303 err_add_protocol: 1304 inet_ctl_sock_destroy(sctp_ctl_sock); 1305 err_ctl_sock_init: 1306 sctp_v6_protosw_exit(); 1307 err_v6_protosw_init: 1308 sctp_v4_protosw_exit(); 1309 err_protosw_init: 1310 sctp_free_local_addr_list(); 1311 sctp_v4_pf_exit(); 1312 sctp_v6_pf_exit(); 1313 sctp_sysctl_unregister(); 1314 free_pages((unsigned long)sctp_port_hashtable, 1315 get_order(sctp_port_hashsize * 1316 sizeof(struct sctp_bind_hashbucket))); 1317 err_bhash_alloc: 1318 kfree(sctp_ep_hashtable); 1319 err_ehash_alloc: 1320 free_pages((unsigned long)sctp_assoc_hashtable, 1321 get_order(sctp_assoc_hashsize * 1322 sizeof(struct sctp_hashbucket))); 1323 err_ahash_alloc: 1324 sctp_dbg_objcnt_exit(); 1325 sctp_proc_exit(); 1326 err_init_proc: 1327 cleanup_sctp_mibs(); 1328 err_init_mibs: 1329 kmem_cache_destroy(sctp_chunk_cachep); 1330 err_chunk_cachep: 1331 kmem_cache_destroy(sctp_bucket_cachep); 1332 goto out; 1333 } 1334 1335 /* Exit handler for the SCTP protocol. */ 1336 SCTP_STATIC __exit void sctp_exit(void) 1337 { 1338 /* BUG. This should probably do something useful like clean 1339 * up all the remaining associations and all that memory. 1340 */ 1341 1342 /* Unregister with inet6/inet layers. */ 1343 sctp_v6_del_protocol(); 1344 sctp_v4_del_protocol(); 1345 1346 /* Free the control endpoint. */ 1347 inet_ctl_sock_destroy(sctp_ctl_sock); 1348 1349 /* Free protosw registrations */ 1350 sctp_v6_protosw_exit(); 1351 sctp_v4_protosw_exit(); 1352 1353 /* Free the local address list. */ 1354 sctp_free_local_addr_list(); 1355 1356 /* Unregister with socket layer. */ 1357 sctp_v6_pf_exit(); 1358 sctp_v4_pf_exit(); 1359 1360 sctp_sysctl_unregister(); 1361 1362 free_pages((unsigned long)sctp_assoc_hashtable, 1363 get_order(sctp_assoc_hashsize * 1364 sizeof(struct sctp_hashbucket))); 1365 kfree(sctp_ep_hashtable); 1366 free_pages((unsigned long)sctp_port_hashtable, 1367 get_order(sctp_port_hashsize * 1368 sizeof(struct sctp_bind_hashbucket))); 1369 1370 sctp_dbg_objcnt_exit(); 1371 sctp_proc_exit(); 1372 cleanup_sctp_mibs(); 1373 1374 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1375 1376 kmem_cache_destroy(sctp_chunk_cachep); 1377 kmem_cache_destroy(sctp_bucket_cachep); 1378 } 1379 1380 module_init(sctp_init); 1381 module_exit(sctp_exit); 1382 1383 /* 1384 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1385 */ 1386 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1387 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1388 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1389 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1390 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644); 1391 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification"); 1392 MODULE_LICENSE("GPL"); 1393