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 #ifdef CONFIG_PROC_FS 106 if (!proc_net_sctp) { 107 struct proc_dir_entry *ent; 108 ent = proc_mkdir("sctp", init_net.proc_net); 109 if (ent) { 110 ent->owner = THIS_MODULE; 111 proc_net_sctp = ent; 112 } else 113 goto out_nomem; 114 } 115 116 if (sctp_snmp_proc_init()) 117 goto out_snmp_proc_init; 118 if (sctp_eps_proc_init()) 119 goto out_eps_proc_init; 120 if (sctp_assocs_proc_init()) 121 goto out_assocs_proc_init; 122 if (sctp_remaddr_proc_init()) 123 goto out_remaddr_proc_init; 124 125 return 0; 126 127 out_remaddr_proc_init: 128 sctp_assocs_proc_exit(); 129 out_assocs_proc_init: 130 sctp_eps_proc_exit(); 131 out_eps_proc_init: 132 sctp_snmp_proc_exit(); 133 out_snmp_proc_init: 134 if (proc_net_sctp) { 135 proc_net_sctp = NULL; 136 remove_proc_entry("sctp", init_net.proc_net); 137 } 138 out_nomem: 139 return -ENOMEM; 140 #else 141 return 0; 142 #endif /* CONFIG_PROC_FS */ 143 } 144 145 /* Clean up the proc fs entry for the SCTP protocol. 146 * Note: Do not make this __exit as it is used in the init error 147 * path. 148 */ 149 static void sctp_proc_exit(void) 150 { 151 #ifdef CONFIG_PROC_FS 152 sctp_snmp_proc_exit(); 153 sctp_eps_proc_exit(); 154 sctp_assocs_proc_exit(); 155 sctp_remaddr_proc_exit(); 156 157 if (proc_net_sctp) { 158 proc_net_sctp = NULL; 159 remove_proc_entry("sctp", init_net.proc_net); 160 } 161 #endif 162 } 163 164 /* Private helper to extract ipv4 address and stash them in 165 * the protocol structure. 166 */ 167 static void sctp_v4_copy_addrlist(struct list_head *addrlist, 168 struct net_device *dev) 169 { 170 struct in_device *in_dev; 171 struct in_ifaddr *ifa; 172 struct sctp_sockaddr_entry *addr; 173 174 rcu_read_lock(); 175 if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { 176 rcu_read_unlock(); 177 return; 178 } 179 180 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 181 /* Add the address to the local list. */ 182 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); 183 if (addr) { 184 addr->a.v4.sin_family = AF_INET; 185 addr->a.v4.sin_port = 0; 186 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 187 addr->valid = 1; 188 INIT_LIST_HEAD(&addr->list); 189 INIT_RCU_HEAD(&addr->rcu); 190 list_add_tail(&addr->list, addrlist); 191 } 192 } 193 194 rcu_read_unlock(); 195 } 196 197 /* Extract our IP addresses from the system and stash them in the 198 * protocol structure. 199 */ 200 static void sctp_get_local_addr_list(void) 201 { 202 struct net_device *dev; 203 struct list_head *pos; 204 struct sctp_af *af; 205 206 read_lock(&dev_base_lock); 207 for_each_netdev(&init_net, dev) { 208 __list_for_each(pos, &sctp_address_families) { 209 af = list_entry(pos, struct sctp_af, list); 210 af->copy_addrlist(&sctp_local_addr_list, dev); 211 } 212 } 213 read_unlock(&dev_base_lock); 214 } 215 216 /* Free the existing local addresses. */ 217 static void sctp_free_local_addr_list(void) 218 { 219 struct sctp_sockaddr_entry *addr; 220 struct list_head *pos, *temp; 221 222 list_for_each_safe(pos, temp, &sctp_local_addr_list) { 223 addr = list_entry(pos, struct sctp_sockaddr_entry, list); 224 list_del(pos); 225 kfree(addr); 226 } 227 } 228 229 void sctp_local_addr_free(struct rcu_head *head) 230 { 231 struct sctp_sockaddr_entry *e = container_of(head, 232 struct sctp_sockaddr_entry, rcu); 233 kfree(e); 234 } 235 236 /* Copy the local addresses which are valid for 'scope' into 'bp'. */ 237 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope, 238 gfp_t gfp, int copy_flags) 239 { 240 struct sctp_sockaddr_entry *addr; 241 int error = 0; 242 243 rcu_read_lock(); 244 list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) { 245 if (!addr->valid) 246 continue; 247 if (sctp_in_scope(&addr->a, scope)) { 248 /* Now that the address is in scope, check to see if 249 * the address type is really supported by the local 250 * sock as well as the remote peer. 251 */ 252 if ((((AF_INET == addr->a.sa.sa_family) && 253 (copy_flags & SCTP_ADDR4_PEERSUPP))) || 254 (((AF_INET6 == addr->a.sa.sa_family) && 255 (copy_flags & SCTP_ADDR6_ALLOWED) && 256 (copy_flags & SCTP_ADDR6_PEERSUPP)))) { 257 error = sctp_add_bind_addr(bp, &addr->a, 258 SCTP_ADDR_SRC, GFP_ATOMIC); 259 if (error) 260 goto end_copy; 261 } 262 } 263 } 264 265 end_copy: 266 rcu_read_unlock(); 267 return error; 268 } 269 270 /* Initialize a sctp_addr from in incoming skb. */ 271 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb, 272 int is_saddr) 273 { 274 void *from; 275 __be16 *port; 276 struct sctphdr *sh; 277 278 port = &addr->v4.sin_port; 279 addr->v4.sin_family = AF_INET; 280 281 sh = sctp_hdr(skb); 282 if (is_saddr) { 283 *port = sh->source; 284 from = &ip_hdr(skb)->saddr; 285 } else { 286 *port = sh->dest; 287 from = &ip_hdr(skb)->daddr; 288 } 289 memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr)); 290 } 291 292 /* Initialize an sctp_addr from a socket. */ 293 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk) 294 { 295 addr->v4.sin_family = AF_INET; 296 addr->v4.sin_port = 0; 297 addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr; 298 } 299 300 /* Initialize sk->sk_rcv_saddr from sctp_addr. */ 301 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk) 302 { 303 inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr; 304 } 305 306 /* Initialize sk->sk_daddr from sctp_addr. */ 307 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk) 308 { 309 inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr; 310 } 311 312 /* Initialize a sctp_addr from an address parameter. */ 313 static void sctp_v4_from_addr_param(union sctp_addr *addr, 314 union sctp_addr_param *param, 315 __be16 port, int iif) 316 { 317 addr->v4.sin_family = AF_INET; 318 addr->v4.sin_port = port; 319 addr->v4.sin_addr.s_addr = param->v4.addr.s_addr; 320 } 321 322 /* Initialize an address parameter from a sctp_addr and return the length 323 * of the address parameter. 324 */ 325 static int sctp_v4_to_addr_param(const union sctp_addr *addr, 326 union sctp_addr_param *param) 327 { 328 int length = sizeof(sctp_ipv4addr_param_t); 329 330 param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS; 331 param->v4.param_hdr.length = htons(length); 332 param->v4.addr.s_addr = addr->v4.sin_addr.s_addr; 333 334 return length; 335 } 336 337 /* Initialize a sctp_addr from a dst_entry. */ 338 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst, 339 __be16 port) 340 { 341 struct rtable *rt = (struct rtable *)dst; 342 saddr->v4.sin_family = AF_INET; 343 saddr->v4.sin_port = port; 344 saddr->v4.sin_addr.s_addr = rt->rt_src; 345 } 346 347 /* Compare two addresses exactly. */ 348 static int sctp_v4_cmp_addr(const union sctp_addr *addr1, 349 const union sctp_addr *addr2) 350 { 351 if (addr1->sa.sa_family != addr2->sa.sa_family) 352 return 0; 353 if (addr1->v4.sin_port != addr2->v4.sin_port) 354 return 0; 355 if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr) 356 return 0; 357 358 return 1; 359 } 360 361 /* Initialize addr struct to INADDR_ANY. */ 362 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port) 363 { 364 addr->v4.sin_family = AF_INET; 365 addr->v4.sin_addr.s_addr = htonl(INADDR_ANY); 366 addr->v4.sin_port = port; 367 } 368 369 /* Is this a wildcard address? */ 370 static int sctp_v4_is_any(const union sctp_addr *addr) 371 { 372 return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr; 373 } 374 375 /* This function checks if the address is a valid address to be used for 376 * SCTP binding. 377 * 378 * Output: 379 * Return 0 - If the address is a non-unicast or an illegal address. 380 * Return 1 - If the address is a unicast. 381 */ 382 static int sctp_v4_addr_valid(union sctp_addr *addr, 383 struct sctp_sock *sp, 384 const struct sk_buff *skb) 385 { 386 /* IPv4 addresses not allowed */ 387 if (sp && ipv6_only_sock(sctp_opt2sk(sp))) 388 return 0; 389 390 /* Is this a non-unicast address or a unusable SCTP address? */ 391 if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) 392 return 0; 393 394 /* Is this a broadcast address? */ 395 if (skb && skb->rtable->rt_flags & RTCF_BROADCAST) 396 return 0; 397 398 return 1; 399 } 400 401 /* Should this be available for binding? */ 402 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp) 403 { 404 int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr); 405 406 407 if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) && 408 ret != RTN_LOCAL && 409 !sp->inet.freebind && 410 !sysctl_ip_nonlocal_bind) 411 return 0; 412 413 if (ipv6_only_sock(sctp_opt2sk(sp))) 414 return 0; 415 416 return 1; 417 } 418 419 /* Checking the loopback, private and other address scopes as defined in 420 * RFC 1918. The IPv4 scoping is based on the draft for SCTP IPv4 421 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>. 422 * 423 * Level 0 - unusable SCTP addresses 424 * Level 1 - loopback address 425 * Level 2 - link-local addresses 426 * Level 3 - private addresses. 427 * Level 4 - global addresses 428 * For INIT and INIT-ACK address list, let L be the level of 429 * of requested destination address, sender and receiver 430 * SHOULD include all of its addresses with level greater 431 * than or equal to L. 432 */ 433 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr) 434 { 435 sctp_scope_t retval; 436 437 /* Should IPv4 scoping be a sysctl configurable option 438 * so users can turn it off (default on) for certain 439 * unconventional networking environments? 440 */ 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:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ", 486 __func__, NIPQUAD(fl.fl4_dst), 487 NIPQUAD(fl.fl4_src)); 488 489 if (!ip_route_output_key(&init_net, &rt, &fl)) { 490 dst = &rt->u.dst; 491 } 492 493 /* If there is no association or if a source address is passed, no 494 * more validation is required. 495 */ 496 if (!asoc || saddr) 497 goto out; 498 499 bp = &asoc->base.bind_addr; 500 501 if (dst) { 502 /* Walk through the bind address list and look for a bind 503 * address that matches the source address of the returned dst. 504 */ 505 sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port)); 506 rcu_read_lock(); 507 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 508 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC)) 509 continue; 510 if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a)) 511 goto out_unlock; 512 } 513 rcu_read_unlock(); 514 515 /* None of the bound addresses match the source address of the 516 * dst. So release it. 517 */ 518 dst_release(dst); 519 dst = NULL; 520 } 521 522 /* Walk through the bind address list and try to get a dst that 523 * matches a bind address as the source address. 524 */ 525 rcu_read_lock(); 526 list_for_each_entry_rcu(laddr, &bp->address_list, list) { 527 if (!laddr->valid) 528 continue; 529 if ((laddr->state == SCTP_ADDR_SRC) && 530 (AF_INET == laddr->a.sa.sa_family)) { 531 fl.fl4_src = laddr->a.v4.sin_addr.s_addr; 532 if (!ip_route_output_key(&init_net, &rt, &fl)) { 533 dst = &rt->u.dst; 534 goto out_unlock; 535 } 536 } 537 } 538 539 out_unlock: 540 rcu_read_unlock(); 541 out: 542 if (dst) 543 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n", 544 NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src)); 545 else 546 SCTP_DEBUG_PRINTK("NO ROUTE\n"); 547 548 return dst; 549 } 550 551 /* For v4, the source address is cached in the route entry(dst). So no need 552 * to cache it separately and hence this is an empty routine. 553 */ 554 static void sctp_v4_get_saddr(struct sctp_sock *sk, 555 struct sctp_association *asoc, 556 struct dst_entry *dst, 557 union sctp_addr *daddr, 558 union sctp_addr *saddr) 559 { 560 struct rtable *rt = (struct rtable *)dst; 561 562 if (!asoc) 563 return; 564 565 if (rt) { 566 saddr->v4.sin_family = AF_INET; 567 saddr->v4.sin_port = htons(asoc->base.bind_addr.port); 568 saddr->v4.sin_addr.s_addr = rt->rt_src; 569 } 570 } 571 572 /* What interface did this skb arrive on? */ 573 static int sctp_v4_skb_iif(const struct sk_buff *skb) 574 { 575 return skb->rtable->rt_iif; 576 } 577 578 /* Was this packet marked by Explicit Congestion Notification? */ 579 static int sctp_v4_is_ce(const struct sk_buff *skb) 580 { 581 return INET_ECN_is_ce(ip_hdr(skb)->tos); 582 } 583 584 /* Create and initialize a new sk for the socket returned by accept(). */ 585 static struct sock *sctp_v4_create_accept_sk(struct sock *sk, 586 struct sctp_association *asoc) 587 { 588 struct inet_sock *inet = inet_sk(sk); 589 struct inet_sock *newinet; 590 struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL, 591 sk->sk_prot); 592 593 if (!newsk) 594 goto out; 595 596 sock_init_data(NULL, newsk); 597 598 newsk->sk_type = SOCK_STREAM; 599 600 newsk->sk_no_check = sk->sk_no_check; 601 newsk->sk_reuse = sk->sk_reuse; 602 newsk->sk_shutdown = sk->sk_shutdown; 603 604 newsk->sk_destruct = inet_sock_destruct; 605 newsk->sk_family = PF_INET; 606 newsk->sk_protocol = IPPROTO_SCTP; 607 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 608 sock_reset_flag(newsk, SOCK_ZAPPED); 609 610 newinet = inet_sk(newsk); 611 612 /* Initialize sk's sport, dport, rcv_saddr and daddr for 613 * getsockname() and getpeername() 614 */ 615 newinet->sport = inet->sport; 616 newinet->saddr = inet->saddr; 617 newinet->rcv_saddr = inet->rcv_saddr; 618 newinet->dport = htons(asoc->peer.port); 619 newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr; 620 newinet->pmtudisc = inet->pmtudisc; 621 newinet->id = asoc->next_tsn ^ jiffies; 622 623 newinet->uc_ttl = -1; 624 newinet->mc_loop = 1; 625 newinet->mc_ttl = 1; 626 newinet->mc_index = 0; 627 newinet->mc_list = NULL; 628 629 sk_refcnt_debug_inc(newsk); 630 631 if (newsk->sk_prot->init(newsk)) { 632 sk_common_release(newsk); 633 newsk = NULL; 634 } 635 636 out: 637 return newsk; 638 } 639 640 /* Map address, empty for v4 family */ 641 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) 642 { 643 /* Empty */ 644 } 645 646 /* Dump the v4 addr to the seq file. */ 647 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) 648 { 649 seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr)); 650 } 651 652 static void sctp_v4_ecn_capable(struct sock *sk) 653 { 654 INET_ECN_xmit(sk); 655 } 656 657 /* Event handler for inet address addition/deletion events. 658 * The sctp_local_addr_list needs to be protocted by a spin lock since 659 * multiple notifiers (say IPv4 and IPv6) may be running at the same 660 * time and thus corrupt the list. 661 * The reader side is protected with RCU. 662 */ 663 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev, 664 void *ptr) 665 { 666 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 667 struct sctp_sockaddr_entry *addr = NULL; 668 struct sctp_sockaddr_entry *temp; 669 int found = 0; 670 671 if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net)) 672 return NOTIFY_DONE; 673 674 switch (ev) { 675 case NETDEV_UP: 676 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); 677 if (addr) { 678 addr->a.v4.sin_family = AF_INET; 679 addr->a.v4.sin_port = 0; 680 addr->a.v4.sin_addr.s_addr = ifa->ifa_local; 681 addr->valid = 1; 682 spin_lock_bh(&sctp_local_addr_lock); 683 list_add_tail_rcu(&addr->list, &sctp_local_addr_list); 684 spin_unlock_bh(&sctp_local_addr_lock); 685 } 686 break; 687 case NETDEV_DOWN: 688 spin_lock_bh(&sctp_local_addr_lock); 689 list_for_each_entry_safe(addr, temp, 690 &sctp_local_addr_list, list) { 691 if (addr->a.sa.sa_family == AF_INET && 692 addr->a.v4.sin_addr.s_addr == 693 ifa->ifa_local) { 694 found = 1; 695 addr->valid = 0; 696 list_del_rcu(&addr->list); 697 break; 698 } 699 } 700 spin_unlock_bh(&sctp_local_addr_lock); 701 if (found) 702 call_rcu(&addr->rcu, sctp_local_addr_free); 703 break; 704 } 705 706 return NOTIFY_DONE; 707 } 708 709 /* 710 * Initialize the control inode/socket with a control endpoint data 711 * structure. This endpoint is reserved exclusively for the OOTB processing. 712 */ 713 static int sctp_ctl_sock_init(void) 714 { 715 int err; 716 sa_family_t family; 717 718 if (sctp_get_pf_specific(PF_INET6)) 719 family = PF_INET6; 720 else 721 family = PF_INET; 722 723 err = inet_ctl_sock_create(&sctp_ctl_sock, family, 724 SOCK_SEQPACKET, IPPROTO_SCTP, &init_net); 725 if (err < 0) { 726 printk(KERN_ERR 727 "SCTP: Failed to create the SCTP control socket.\n"); 728 return err; 729 } 730 return 0; 731 } 732 733 /* Register address family specific functions. */ 734 int sctp_register_af(struct sctp_af *af) 735 { 736 switch (af->sa_family) { 737 case AF_INET: 738 if (sctp_af_v4_specific) 739 return 0; 740 sctp_af_v4_specific = af; 741 break; 742 case AF_INET6: 743 if (sctp_af_v6_specific) 744 return 0; 745 sctp_af_v6_specific = af; 746 break; 747 default: 748 return 0; 749 } 750 751 INIT_LIST_HEAD(&af->list); 752 list_add_tail(&af->list, &sctp_address_families); 753 return 1; 754 } 755 756 /* Get the table of functions for manipulating a particular address 757 * family. 758 */ 759 struct sctp_af *sctp_get_af_specific(sa_family_t family) 760 { 761 switch (family) { 762 case AF_INET: 763 return sctp_af_v4_specific; 764 case AF_INET6: 765 return sctp_af_v6_specific; 766 default: 767 return NULL; 768 } 769 } 770 771 /* Common code to initialize a AF_INET msg_name. */ 772 static void sctp_inet_msgname(char *msgname, int *addr_len) 773 { 774 struct sockaddr_in *sin; 775 776 sin = (struct sockaddr_in *)msgname; 777 *addr_len = sizeof(struct sockaddr_in); 778 sin->sin_family = AF_INET; 779 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 780 } 781 782 /* Copy the primary address of the peer primary address as the msg_name. */ 783 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname, 784 int *addr_len) 785 { 786 struct sockaddr_in *sin, *sinfrom; 787 788 if (msgname) { 789 struct sctp_association *asoc; 790 791 asoc = event->asoc; 792 sctp_inet_msgname(msgname, addr_len); 793 sin = (struct sockaddr_in *)msgname; 794 sinfrom = &asoc->peer.primary_addr.v4; 795 sin->sin_port = htons(asoc->peer.port); 796 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr; 797 } 798 } 799 800 /* Initialize and copy out a msgname from an inbound skb. */ 801 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len) 802 { 803 if (msgname) { 804 struct sctphdr *sh = sctp_hdr(skb); 805 struct sockaddr_in *sin = (struct sockaddr_in *)msgname; 806 807 sctp_inet_msgname(msgname, len); 808 sin->sin_port = sh->source; 809 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 810 } 811 } 812 813 /* Do we support this AF? */ 814 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp) 815 { 816 /* PF_INET only supports AF_INET addresses. */ 817 return (AF_INET == family); 818 } 819 820 /* Address matching with wildcards allowed. */ 821 static int sctp_inet_cmp_addr(const union sctp_addr *addr1, 822 const union sctp_addr *addr2, 823 struct sctp_sock *opt) 824 { 825 /* PF_INET only supports AF_INET addresses. */ 826 if (addr1->sa.sa_family != addr2->sa.sa_family) 827 return 0; 828 if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr || 829 htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr) 830 return 1; 831 if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr) 832 return 1; 833 834 return 0; 835 } 836 837 /* Verify that provided sockaddr looks bindable. Common verification has 838 * already been taken care of. 839 */ 840 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) 841 { 842 return sctp_v4_available(addr, opt); 843 } 844 845 /* Verify that sockaddr looks sendable. Common verification has already 846 * been taken care of. 847 */ 848 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr) 849 { 850 return 1; 851 } 852 853 /* Fill in Supported Address Type information for INIT and INIT-ACK 854 * chunks. Returns number of addresses supported. 855 */ 856 static int sctp_inet_supported_addrs(const struct sctp_sock *opt, 857 __be16 *types) 858 { 859 types[0] = SCTP_PARAM_IPV4_ADDRESS; 860 return 1; 861 } 862 863 /* Wrapper routine that calls the ip transmit routine. */ 864 static inline int sctp_v4_xmit(struct sk_buff *skb, 865 struct sctp_transport *transport) 866 { 867 struct inet_sock *inet = inet_sk(skb->sk); 868 869 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " 870 "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n", 871 __func__, skb, skb->len, 872 NIPQUAD(skb->rtable->rt_src), 873 NIPQUAD(skb->rtable->rt_dst)); 874 875 inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ? 876 IP_PMTUDISC_DO : IP_PMTUDISC_DONT; 877 878 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); 879 return ip_queue_xmit(skb, 0); 880 } 881 882 static struct sctp_af sctp_af_inet; 883 884 static struct sctp_pf sctp_pf_inet = { 885 .event_msgname = sctp_inet_event_msgname, 886 .skb_msgname = sctp_inet_skb_msgname, 887 .af_supported = sctp_inet_af_supported, 888 .cmp_addr = sctp_inet_cmp_addr, 889 .bind_verify = sctp_inet_bind_verify, 890 .send_verify = sctp_inet_send_verify, 891 .supported_addrs = sctp_inet_supported_addrs, 892 .create_accept_sk = sctp_v4_create_accept_sk, 893 .addr_v4map = sctp_v4_addr_v4map, 894 .af = &sctp_af_inet 895 }; 896 897 /* Notifier for inetaddr addition/deletion events. */ 898 static struct notifier_block sctp_inetaddr_notifier = { 899 .notifier_call = sctp_inetaddr_event, 900 }; 901 902 /* Socket operations. */ 903 static const struct proto_ops inet_seqpacket_ops = { 904 .family = PF_INET, 905 .owner = THIS_MODULE, 906 .release = inet_release, /* Needs to be wrapped... */ 907 .bind = inet_bind, 908 .connect = inet_dgram_connect, 909 .socketpair = sock_no_socketpair, 910 .accept = inet_accept, 911 .getname = inet_getname, /* Semantics are different. */ 912 .poll = sctp_poll, 913 .ioctl = inet_ioctl, 914 .listen = sctp_inet_listen, 915 .shutdown = inet_shutdown, /* Looks harmless. */ 916 .setsockopt = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */ 917 .getsockopt = sock_common_getsockopt, 918 .sendmsg = inet_sendmsg, 919 .recvmsg = sock_common_recvmsg, 920 .mmap = sock_no_mmap, 921 .sendpage = sock_no_sendpage, 922 #ifdef CONFIG_COMPAT 923 .compat_setsockopt = compat_sock_common_setsockopt, 924 .compat_getsockopt = compat_sock_common_getsockopt, 925 #endif 926 }; 927 928 /* Registration with AF_INET family. */ 929 static struct inet_protosw sctp_seqpacket_protosw = { 930 .type = SOCK_SEQPACKET, 931 .protocol = IPPROTO_SCTP, 932 .prot = &sctp_prot, 933 .ops = &inet_seqpacket_ops, 934 .capability = -1, 935 .no_check = 0, 936 .flags = SCTP_PROTOSW_FLAG 937 }; 938 static struct inet_protosw sctp_stream_protosw = { 939 .type = SOCK_STREAM, 940 .protocol = IPPROTO_SCTP, 941 .prot = &sctp_prot, 942 .ops = &inet_seqpacket_ops, 943 .capability = -1, 944 .no_check = 0, 945 .flags = SCTP_PROTOSW_FLAG 946 }; 947 948 /* Register with IP layer. */ 949 static struct net_protocol sctp_protocol = { 950 .handler = sctp_rcv, 951 .err_handler = sctp_v4_err, 952 .no_policy = 1, 953 }; 954 955 /* IPv4 address related functions. */ 956 static struct sctp_af sctp_af_inet = { 957 .sa_family = AF_INET, 958 .sctp_xmit = sctp_v4_xmit, 959 .setsockopt = ip_setsockopt, 960 .getsockopt = ip_getsockopt, 961 .get_dst = sctp_v4_get_dst, 962 .get_saddr = sctp_v4_get_saddr, 963 .copy_addrlist = sctp_v4_copy_addrlist, 964 .from_skb = sctp_v4_from_skb, 965 .from_sk = sctp_v4_from_sk, 966 .to_sk_saddr = sctp_v4_to_sk_saddr, 967 .to_sk_daddr = sctp_v4_to_sk_daddr, 968 .from_addr_param = sctp_v4_from_addr_param, 969 .to_addr_param = sctp_v4_to_addr_param, 970 .dst_saddr = sctp_v4_dst_saddr, 971 .cmp_addr = sctp_v4_cmp_addr, 972 .addr_valid = sctp_v4_addr_valid, 973 .inaddr_any = sctp_v4_inaddr_any, 974 .is_any = sctp_v4_is_any, 975 .available = sctp_v4_available, 976 .scope = sctp_v4_scope, 977 .skb_iif = sctp_v4_skb_iif, 978 .is_ce = sctp_v4_is_ce, 979 .seq_dump_addr = sctp_v4_seq_dump_addr, 980 .ecn_capable = sctp_v4_ecn_capable, 981 .net_header_len = sizeof(struct iphdr), 982 .sockaddr_len = sizeof(struct sockaddr_in), 983 #ifdef CONFIG_COMPAT 984 .compat_setsockopt = compat_ip_setsockopt, 985 .compat_getsockopt = compat_ip_getsockopt, 986 #endif 987 }; 988 989 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) { 990 991 switch (family) { 992 case PF_INET: 993 return sctp_pf_inet_specific; 994 case PF_INET6: 995 return sctp_pf_inet6_specific; 996 default: 997 return NULL; 998 } 999 } 1000 1001 /* Register the PF specific function table. */ 1002 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family) 1003 { 1004 switch (family) { 1005 case PF_INET: 1006 if (sctp_pf_inet_specific) 1007 return 0; 1008 sctp_pf_inet_specific = pf; 1009 break; 1010 case PF_INET6: 1011 if (sctp_pf_inet6_specific) 1012 return 0; 1013 sctp_pf_inet6_specific = pf; 1014 break; 1015 default: 1016 return 0; 1017 } 1018 return 1; 1019 } 1020 1021 static inline int init_sctp_mibs(void) 1022 { 1023 return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib)); 1024 } 1025 1026 static inline void cleanup_sctp_mibs(void) 1027 { 1028 snmp_mib_free((void**)sctp_statistics); 1029 } 1030 1031 static void sctp_v4_pf_init(void) 1032 { 1033 /* Initialize the SCTP specific PF functions. */ 1034 sctp_register_pf(&sctp_pf_inet, PF_INET); 1035 sctp_register_af(&sctp_af_inet); 1036 } 1037 1038 static void sctp_v4_pf_exit(void) 1039 { 1040 list_del(&sctp_af_inet.list); 1041 } 1042 1043 static int sctp_v4_protosw_init(void) 1044 { 1045 int rc; 1046 1047 rc = proto_register(&sctp_prot, 1); 1048 if (rc) 1049 return rc; 1050 1051 /* Register SCTP(UDP and TCP style) with socket layer. */ 1052 inet_register_protosw(&sctp_seqpacket_protosw); 1053 inet_register_protosw(&sctp_stream_protosw); 1054 1055 return 0; 1056 } 1057 1058 static void sctp_v4_protosw_exit(void) 1059 { 1060 inet_unregister_protosw(&sctp_stream_protosw); 1061 inet_unregister_protosw(&sctp_seqpacket_protosw); 1062 proto_unregister(&sctp_prot); 1063 } 1064 1065 static int sctp_v4_add_protocol(void) 1066 { 1067 /* Register notifier for inet address additions/deletions. */ 1068 register_inetaddr_notifier(&sctp_inetaddr_notifier); 1069 1070 /* Register SCTP with inet layer. */ 1071 if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) 1072 return -EAGAIN; 1073 1074 return 0; 1075 } 1076 1077 static void sctp_v4_del_protocol(void) 1078 { 1079 inet_del_protocol(&sctp_protocol, IPPROTO_SCTP); 1080 unregister_inetaddr_notifier(&sctp_inetaddr_notifier); 1081 } 1082 1083 /* Initialize the universe into something sensible. */ 1084 SCTP_STATIC __init int sctp_init(void) 1085 { 1086 int i; 1087 int status = -EINVAL; 1088 unsigned long goal; 1089 unsigned long limit; 1090 unsigned long nr_pages; 1091 int max_share; 1092 int order; 1093 1094 /* SCTP_DEBUG sanity check. */ 1095 if (!sctp_sanity_check()) 1096 goto out; 1097 1098 /* Allocate bind_bucket and chunk caches. */ 1099 status = -ENOBUFS; 1100 sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket", 1101 sizeof(struct sctp_bind_bucket), 1102 0, SLAB_HWCACHE_ALIGN, 1103 NULL); 1104 if (!sctp_bucket_cachep) 1105 goto out; 1106 1107 sctp_chunk_cachep = kmem_cache_create("sctp_chunk", 1108 sizeof(struct sctp_chunk), 1109 0, SLAB_HWCACHE_ALIGN, 1110 NULL); 1111 if (!sctp_chunk_cachep) 1112 goto err_chunk_cachep; 1113 1114 /* Allocate and initialise sctp mibs. */ 1115 status = init_sctp_mibs(); 1116 if (status) 1117 goto err_init_mibs; 1118 1119 /* Initialize proc fs directory. */ 1120 status = sctp_proc_init(); 1121 if (status) 1122 goto err_init_proc; 1123 1124 /* Initialize object count debugging. */ 1125 sctp_dbg_objcnt_init(); 1126 1127 /* 1128 * 14. Suggested SCTP Protocol Parameter Values 1129 */ 1130 /* The following protocol parameters are RECOMMENDED: */ 1131 /* RTO.Initial - 3 seconds */ 1132 sctp_rto_initial = SCTP_RTO_INITIAL; 1133 /* RTO.Min - 1 second */ 1134 sctp_rto_min = SCTP_RTO_MIN; 1135 /* RTO.Max - 60 seconds */ 1136 sctp_rto_max = SCTP_RTO_MAX; 1137 /* RTO.Alpha - 1/8 */ 1138 sctp_rto_alpha = SCTP_RTO_ALPHA; 1139 /* RTO.Beta - 1/4 */ 1140 sctp_rto_beta = SCTP_RTO_BETA; 1141 1142 /* Valid.Cookie.Life - 60 seconds */ 1143 sctp_valid_cookie_life = SCTP_DEFAULT_COOKIE_LIFE; 1144 1145 /* Whether Cookie Preservative is enabled(1) or not(0) */ 1146 sctp_cookie_preserve_enable = 1; 1147 1148 /* Max.Burst - 4 */ 1149 sctp_max_burst = SCTP_DEFAULT_MAX_BURST; 1150 1151 /* Association.Max.Retrans - 10 attempts 1152 * Path.Max.Retrans - 5 attempts (per destination address) 1153 * Max.Init.Retransmits - 8 attempts 1154 */ 1155 sctp_max_retrans_association = 10; 1156 sctp_max_retrans_path = 5; 1157 sctp_max_retrans_init = 8; 1158 1159 /* Sendbuffer growth - do per-socket accounting */ 1160 sctp_sndbuf_policy = 0; 1161 1162 /* Rcvbuffer growth - do per-socket accounting */ 1163 sctp_rcvbuf_policy = 0; 1164 1165 /* HB.interval - 30 seconds */ 1166 sctp_hb_interval = SCTP_DEFAULT_TIMEOUT_HEARTBEAT; 1167 1168 /* delayed SACK timeout */ 1169 sctp_sack_timeout = SCTP_DEFAULT_TIMEOUT_SACK; 1170 1171 /* Implementation specific variables. */ 1172 1173 /* Initialize default stream count setup information. */ 1174 sctp_max_instreams = SCTP_DEFAULT_INSTREAMS; 1175 sctp_max_outstreams = SCTP_DEFAULT_OUTSTREAMS; 1176 1177 /* Initialize handle used for association ids. */ 1178 idr_init(&sctp_assocs_id); 1179 1180 /* Set the pressure threshold to be a fraction of global memory that 1181 * is up to 1/2 at 256 MB, decreasing toward zero with the amount of 1182 * memory, with a floor of 128 pages. 1183 * Note this initalizes the data in sctpv6_prot too 1184 * Unabashedly stolen from tcp_init 1185 */ 1186 nr_pages = totalram_pages - totalhigh_pages; 1187 limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); 1188 limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); 1189 limit = max(limit, 128UL); 1190 sysctl_sctp_mem[0] = limit / 4 * 3; 1191 sysctl_sctp_mem[1] = limit; 1192 sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2; 1193 1194 /* Set per-socket limits to no more than 1/128 the pressure threshold*/ 1195 limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7); 1196 max_share = min(4UL*1024*1024, limit); 1197 1198 sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */ 1199 sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1)); 1200 sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share); 1201 1202 sysctl_sctp_wmem[0] = SK_MEM_QUANTUM; 1203 sysctl_sctp_wmem[1] = 16*1024; 1204 sysctl_sctp_wmem[2] = max(64*1024, max_share); 1205 1206 /* Size and allocate the association hash table. 1207 * The methodology is similar to that of the tcp hash tables. 1208 */ 1209 if (num_physpages >= (128 * 1024)) 1210 goal = num_physpages >> (22 - PAGE_SHIFT); 1211 else 1212 goal = num_physpages >> (24 - PAGE_SHIFT); 1213 1214 for (order = 0; (1UL << order) < goal; order++) 1215 ; 1216 1217 do { 1218 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE / 1219 sizeof(struct sctp_hashbucket); 1220 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0) 1221 continue; 1222 sctp_assoc_hashtable = (struct sctp_hashbucket *) 1223 __get_free_pages(GFP_ATOMIC, order); 1224 } while (!sctp_assoc_hashtable && --order > 0); 1225 if (!sctp_assoc_hashtable) { 1226 printk(KERN_ERR "SCTP: Failed association hash alloc.\n"); 1227 status = -ENOMEM; 1228 goto err_ahash_alloc; 1229 } 1230 for (i = 0; i < sctp_assoc_hashsize; i++) { 1231 rwlock_init(&sctp_assoc_hashtable[i].lock); 1232 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain); 1233 } 1234 1235 /* Allocate and initialize the endpoint hash table. */ 1236 sctp_ep_hashsize = 64; 1237 sctp_ep_hashtable = (struct sctp_hashbucket *) 1238 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL); 1239 if (!sctp_ep_hashtable) { 1240 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n"); 1241 status = -ENOMEM; 1242 goto err_ehash_alloc; 1243 } 1244 for (i = 0; i < sctp_ep_hashsize; i++) { 1245 rwlock_init(&sctp_ep_hashtable[i].lock); 1246 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain); 1247 } 1248 1249 /* Allocate and initialize the SCTP port hash table. */ 1250 do { 1251 sctp_port_hashsize = (1UL << order) * PAGE_SIZE / 1252 sizeof(struct sctp_bind_hashbucket); 1253 if ((sctp_port_hashsize > (64 * 1024)) && order > 0) 1254 continue; 1255 sctp_port_hashtable = (struct sctp_bind_hashbucket *) 1256 __get_free_pages(GFP_ATOMIC, order); 1257 } while (!sctp_port_hashtable && --order > 0); 1258 if (!sctp_port_hashtable) { 1259 printk(KERN_ERR "SCTP: Failed bind hash alloc."); 1260 status = -ENOMEM; 1261 goto err_bhash_alloc; 1262 } 1263 for (i = 0; i < sctp_port_hashsize; i++) { 1264 spin_lock_init(&sctp_port_hashtable[i].lock); 1265 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain); 1266 } 1267 1268 printk(KERN_INFO "SCTP: Hash tables configured " 1269 "(established %d bind %d)\n", 1270 sctp_assoc_hashsize, sctp_port_hashsize); 1271 1272 /* Disable ADDIP by default. */ 1273 sctp_addip_enable = 0; 1274 sctp_addip_noauth = 0; 1275 1276 /* Enable PR-SCTP by default. */ 1277 sctp_prsctp_enable = 1; 1278 1279 /* Disable AUTH by default. */ 1280 sctp_auth_enable = 0; 1281 1282 sctp_sysctl_register(); 1283 1284 INIT_LIST_HEAD(&sctp_address_families); 1285 sctp_v4_pf_init(); 1286 sctp_v6_pf_init(); 1287 1288 /* Initialize the local address list. */ 1289 INIT_LIST_HEAD(&sctp_local_addr_list); 1290 spin_lock_init(&sctp_local_addr_lock); 1291 sctp_get_local_addr_list(); 1292 1293 status = sctp_v4_protosw_init(); 1294 1295 if (status) 1296 goto err_protosw_init; 1297 1298 status = sctp_v6_protosw_init(); 1299 if (status) 1300 goto err_v6_protosw_init; 1301 1302 /* Initialize the control inode/socket for handling OOTB packets. */ 1303 if ((status = sctp_ctl_sock_init())) { 1304 printk (KERN_ERR 1305 "SCTP: Failed to initialize the SCTP control sock.\n"); 1306 goto err_ctl_sock_init; 1307 } 1308 1309 status = sctp_v4_add_protocol(); 1310 if (status) 1311 goto err_add_protocol; 1312 1313 /* Register SCTP with inet6 layer. */ 1314 status = sctp_v6_add_protocol(); 1315 if (status) 1316 goto err_v6_add_protocol; 1317 1318 status = 0; 1319 out: 1320 return status; 1321 err_v6_add_protocol: 1322 sctp_v6_del_protocol(); 1323 err_add_protocol: 1324 sctp_v4_del_protocol(); 1325 inet_ctl_sock_destroy(sctp_ctl_sock); 1326 err_ctl_sock_init: 1327 sctp_v6_protosw_exit(); 1328 err_v6_protosw_init: 1329 sctp_v4_protosw_exit(); 1330 err_protosw_init: 1331 sctp_free_local_addr_list(); 1332 sctp_v4_pf_exit(); 1333 sctp_v6_pf_exit(); 1334 sctp_sysctl_unregister(); 1335 list_del(&sctp_af_inet.list); 1336 free_pages((unsigned long)sctp_port_hashtable, 1337 get_order(sctp_port_hashsize * 1338 sizeof(struct sctp_bind_hashbucket))); 1339 err_bhash_alloc: 1340 kfree(sctp_ep_hashtable); 1341 err_ehash_alloc: 1342 free_pages((unsigned long)sctp_assoc_hashtable, 1343 get_order(sctp_assoc_hashsize * 1344 sizeof(struct sctp_hashbucket))); 1345 err_ahash_alloc: 1346 sctp_dbg_objcnt_exit(); 1347 sctp_proc_exit(); 1348 err_init_proc: 1349 cleanup_sctp_mibs(); 1350 err_init_mibs: 1351 kmem_cache_destroy(sctp_chunk_cachep); 1352 err_chunk_cachep: 1353 kmem_cache_destroy(sctp_bucket_cachep); 1354 goto out; 1355 } 1356 1357 /* Exit handler for the SCTP protocol. */ 1358 SCTP_STATIC __exit void sctp_exit(void) 1359 { 1360 /* BUG. This should probably do something useful like clean 1361 * up all the remaining associations and all that memory. 1362 */ 1363 1364 /* Unregister with inet6/inet layers. */ 1365 sctp_v6_del_protocol(); 1366 sctp_v4_del_protocol(); 1367 1368 /* Free the control endpoint. */ 1369 inet_ctl_sock_destroy(sctp_ctl_sock); 1370 1371 /* Free protosw registrations */ 1372 sctp_v6_protosw_exit(); 1373 sctp_v4_protosw_exit(); 1374 1375 /* Free the local address list. */ 1376 sctp_free_local_addr_list(); 1377 1378 /* Unregister with socket layer. */ 1379 sctp_v6_pf_exit(); 1380 sctp_v4_pf_exit(); 1381 1382 sctp_sysctl_unregister(); 1383 list_del(&sctp_af_inet.list); 1384 1385 free_pages((unsigned long)sctp_assoc_hashtable, 1386 get_order(sctp_assoc_hashsize * 1387 sizeof(struct sctp_hashbucket))); 1388 kfree(sctp_ep_hashtable); 1389 free_pages((unsigned long)sctp_port_hashtable, 1390 get_order(sctp_port_hashsize * 1391 sizeof(struct sctp_bind_hashbucket))); 1392 1393 sctp_dbg_objcnt_exit(); 1394 sctp_proc_exit(); 1395 cleanup_sctp_mibs(); 1396 1397 kmem_cache_destroy(sctp_chunk_cachep); 1398 kmem_cache_destroy(sctp_bucket_cachep); 1399 } 1400 1401 module_init(sctp_init); 1402 module_exit(sctp_exit); 1403 1404 /* 1405 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly. 1406 */ 1407 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132"); 1408 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132"); 1409 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>"); 1410 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)"); 1411 MODULE_LICENSE("GPL"); 1412