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   1 /* SCTP kernel reference 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 reference Implementation
  10  *
  11  * Initialization/cleanup for SCTP protocol support.
  12  *
  13  * The SCTP reference 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  * The SCTP reference 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 <net/protocol.h>
  55 #include <net/ip.h>
  56 #include <net/ipv6.h>
  57 #include <net/route.h>
  58 #include <net/sctp/sctp.h>
  59 #include <net/addrconf.h>
  60 #include <net/inet_common.h>
  61 #include <net/inet_ecn.h>
  62
  63 /* Global data structures. */
  64 struct sctp_globals sctp_globals __read_mostly;
  65 struct proc_dir_entry   *proc_net_sctp;
  66 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
  67
  68 struct idr sctp_assocs_id;
  69 DEFINE_SPINLOCK(sctp_assocs_id_lock);
  70
  71 /* This is the global socket data structure used for responding to
  72  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
  73  * for this socket at the initialization time.
  74  */
  75 static struct socket *sctp_ctl_socket;
  76
  77 static struct sctp_pf *sctp_pf_inet6_specific;
  78 static struct sctp_pf *sctp_pf_inet_specific;
  79 static struct sctp_af *sctp_af_v4_specific;
  80 static struct sctp_af *sctp_af_v6_specific;
  81
  82 struct kmem_cache *sctp_chunk_cachep __read_mostly;
  83 struct kmem_cache *sctp_bucket_cachep __read_mostly;
  84
  85 /* Return the address of the control sock. */
  86 struct sock *sctp_get_ctl_sock(void)
  87 {
  88         return sctp_ctl_socket->sk;
  89 }
  90
  91 /* Set up the proc fs entry for the SCTP protocol. */
  92 static __init int sctp_proc_init(void)
  93 {
  94         if (!proc_net_sctp) {
  95                 struct proc_dir_entry *ent;
  96                 ent = proc_mkdir("net/sctp", NULL);
  97                 if (ent) {
  98                         ent->owner = THIS_MODULE;
  99                         proc_net_sctp = ent;
 100                 } else
 101                         goto out_nomem;
 102         }
 103
 104         if (sctp_snmp_proc_init())
 105                 goto out_nomem;
 106         if (sctp_eps_proc_init())
 107                 goto out_nomem;
 108         if (sctp_assocs_proc_init())
 109                 goto out_nomem;
 110
 111         return 0;
 112
 113 out_nomem:
 114         return -ENOMEM;
 115 }
 116
 117 /* Clean up the proc fs entry for the SCTP protocol.
 118  * Note: Do not make this __exit as it is used in the init error
 119  * path.
 120  */
 121 static void sctp_proc_exit(void)
 122 {
 123         sctp_snmp_proc_exit();
 124         sctp_eps_proc_exit();
 125         sctp_assocs_proc_exit();
 126
 127         if (proc_net_sctp) {
 128                 proc_net_sctp = NULL;
 129                 remove_proc_entry("net/sctp", NULL);
 130         }
 131 }
 132
 133 /* Private helper to extract ipv4 address and stash them in
 134  * the protocol structure.
 135  */
 136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 137                                   struct net_device *dev)
 138 {
 139         struct in_device *in_dev;
 140         struct in_ifaddr *ifa;
 141         struct sctp_sockaddr_entry *addr;
 142
 143         rcu_read_lock();
 144         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 145                 rcu_read_unlock();
 146                 return;
 147         }
 148
 149         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 150                 /* Add the address to the local list.  */
 151                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 152                 if (addr) {
 153                         addr->a.v4.sin_family = AF_INET;
 154                         addr->a.v4.sin_port = 0;
 155                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 156                         list_add_tail(&addr->list, addrlist);
 157                 }
 158         }
 159
 160         rcu_read_unlock();
 161 }
 162
 163 /* Extract our IP addresses from the system and stash them in the
 164  * protocol structure.
 165  */
 166 static void sctp_get_local_addr_list(void)
 167 {
 168         struct net_device *dev;
 169         struct list_head *pos;
 170         struct sctp_af *af;
 171
 172         read_lock(&dev_base_lock);
 173         for (dev = dev_base; dev; dev = dev->next) {
 174                 __list_for_each(pos, &sctp_address_families) {
 175                         af = list_entry(pos, struct sctp_af, list);
 176                         af->copy_addrlist(&sctp_local_addr_list, dev);
 177                 }
 178         }
 179         read_unlock(&dev_base_lock);
 180 }
 181
 182 /* Free the existing local addresses.  */
 183 static void sctp_free_local_addr_list(void)
 184 {
 185         struct sctp_sockaddr_entry *addr;
 186         struct list_head *pos, *temp;
 187
 188         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 189                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 190                 list_del(pos);
 191                 kfree(addr);
 192         }
 193 }
 194
 195 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 196 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 197                               gfp_t gfp, int copy_flags)
 198 {
 199         struct sctp_sockaddr_entry *addr;
 200         int error = 0;
 201         struct list_head *pos, *temp;
 202
 203         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 204                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 205                 if (sctp_in_scope(&addr->a, scope)) {
 206                         /* Now that the address is in scope, check to see if
 207                          * the address type is really supported by the local
 208                          * sock as well as the remote peer.
 209                          */
 210                         if ((((AF_INET == addr->a.sa.sa_family) &&
 211                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 212                             (((AF_INET6 == addr->a.sa.sa_family) &&
 213                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
 214                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 215                                 error = sctp_add_bind_addr(bp, &addr->a, 1,
 216                                                            GFP_ATOMIC);
 217                                 if (error)
 218                                         goto end_copy;
 219                         }
 220                 }
 221         }
 222
 223 end_copy:
 224         return error;
 225 }
 226
 227 /* Initialize a sctp_addr from in incoming skb.  */
 228 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 229                              int is_saddr)
 230 {
 231         void *from;
 232         __be16 *port;
 233         struct sctphdr *sh;
 234
 235         port = &addr->v4.sin_port;
 236         addr->v4.sin_family = AF_INET;
 237
 238         sh = sctp_hdr(skb);
 239         if (is_saddr) {
 240                 *port  = sh->source;
 241                 from = &ip_hdr(skb)->saddr;
 242         } else {
 243                 *port = sh->dest;
 244                 from = &ip_hdr(skb)->daddr;
 245         }
 246         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 247 }
 248
 249 /* Initialize an sctp_addr from a socket. */
 250 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 251 {
 252         addr->v4.sin_family = AF_INET;
 253         addr->v4.sin_port = 0;
 254         addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
 255 }
 256
 257 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
 258 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 259 {
 260         inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
 261 }
 262
 263 /* Initialize sk->sk_daddr from sctp_addr. */
 264 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 265 {
 266         inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
 267 }
 268
 269 /* Initialize a sctp_addr from an address parameter. */
 270 static void sctp_v4_from_addr_param(union sctp_addr *addr,
 271                                     union sctp_addr_param *param,
 272                                     __be16 port, int iif)
 273 {
 274         addr->v4.sin_family = AF_INET;
 275         addr->v4.sin_port = port;
 276         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 277 }
 278
 279 /* Initialize an address parameter from a sctp_addr and return the length
 280  * of the address parameter.
 281  */
 282 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 283                                  union sctp_addr_param *param)
 284 {
 285         int length = sizeof(sctp_ipv4addr_param_t);
 286
 287         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 288         param->v4.param_hdr.length = htons(length);
 289         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 290
 291         return length;
 292 }
 293
 294 /* Initialize a sctp_addr from a dst_entry. */
 295 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
 296                               __be16 port)
 297 {
 298         struct rtable *rt = (struct rtable *)dst;
 299         saddr->v4.sin_family = AF_INET;
 300         saddr->v4.sin_port = port;
 301         saddr->v4.sin_addr.s_addr = rt->rt_src;
 302 }
 303
 304 /* Compare two addresses exactly. */
 305 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 306                             const union sctp_addr *addr2)
 307 {
 308         if (addr1->sa.sa_family != addr2->sa.sa_family)
 309                 return 0;
 310         if (addr1->v4.sin_port != addr2->v4.sin_port)
 311                 return 0;
 312         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 313                 return 0;
 314
 315         return 1;
 316 }
 317
 318 /* Initialize addr struct to INADDR_ANY. */
 319 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 320 {
 321         addr->v4.sin_family = AF_INET;
 322         addr->v4.sin_addr.s_addr = INADDR_ANY;
 323         addr->v4.sin_port = port;
 324 }
 325
 326 /* Is this a wildcard address? */
 327 static int sctp_v4_is_any(const union sctp_addr *addr)
 328 {
 329         return INADDR_ANY == addr->v4.sin_addr.s_addr;
 330 }
 331
 332 /* This function checks if the address is a valid address to be used for
 333  * SCTP binding.
 334  *
 335  * Output:
 336  * Return 0 - If the address is a non-unicast or an illegal address.
 337  * Return 1 - If the address is a unicast.
 338  */
 339 static int sctp_v4_addr_valid(union sctp_addr *addr,
 340                               struct sctp_sock *sp,
 341                               const struct sk_buff *skb)
 342 {
 343         /* Is this a non-unicast address or a unusable SCTP address? */
 344         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
 345                 return 0;
 346
 347         /* Is this a broadcast address? */
 348         if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
 349                 return 0;
 350
 351         return 1;
 352 }
 353
 354 /* Should this be available for binding?   */
 355 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 356 {
 357         int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
 358
 359
 360         if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
 361            ret != RTN_LOCAL &&
 362            !sp->inet.freebind &&
 363            !sysctl_ip_nonlocal_bind)
 364                 return 0;
 365
 366         return 1;
 367 }
 368
 369 /* Checking the loopback, private and other address scopes as defined in
 370  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 371  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 372  *
 373  * Level 0 - unusable SCTP addresses
 374  * Level 1 - loopback address
 375  * Level 2 - link-local addresses
 376  * Level 3 - private addresses.
 377  * Level 4 - global addresses
 378  * For INIT and INIT-ACK address list, let L be the level of
 379  * of requested destination address, sender and receiver
 380  * SHOULD include all of its addresses with level greater
 381  * than or equal to L.
 382  */
 383 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 384 {
 385         sctp_scope_t retval;
 386
 387         /* Should IPv4 scoping be a sysctl configurable option
 388          * so users can turn it off (default on) for certain
 389          * unconventional networking environments?
 390          */
 391
 392         /* Check for unusable SCTP addresses. */
 393         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 394                 retval =  SCTP_SCOPE_UNUSABLE;
 395         } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
 396                 retval = SCTP_SCOPE_LOOPBACK;
 397         } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 398                 retval = SCTP_SCOPE_LINK;
 399         } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 400                 retval = SCTP_SCOPE_PRIVATE;
 401         } else {
 402                 retval = SCTP_SCOPE_GLOBAL;
 403         }
 404
 405         return retval;
 406 }
 407
 408 /* Returns a valid dst cache entry for the given source and destination ip
 409  * addresses. If an association is passed, trys to get a dst entry with a
 410  * source address that matches an address in the bind address list.
 411  */
 412 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
 413                                          union sctp_addr *daddr,
 414                                          union sctp_addr *saddr)
 415 {
 416         struct rtable *rt;
 417         struct flowi fl;
 418         struct sctp_bind_addr *bp;
 419         rwlock_t *addr_lock;
 420         struct sctp_sockaddr_entry *laddr;
 421         struct list_head *pos;
 422         struct dst_entry *dst = NULL;
 423         union sctp_addr dst_saddr;
 424
 425         memset(&fl, 0x0, sizeof(struct flowi));
 426         fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 427         fl.proto = IPPROTO_SCTP;
 428         if (asoc) {
 429                 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
 430                 fl.oif = asoc->base.sk->sk_bound_dev_if;
 431         }
 432         if (saddr)
 433                 fl.fl4_src = saddr->v4.sin_addr.s_addr;
 434
 435         SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
 436                           __FUNCTION__, NIPQUAD(fl.fl4_dst),
 437                           NIPQUAD(fl.fl4_src));
 438
 439         if (!ip_route_output_key(&rt, &fl)) {
 440                 dst = &rt->u.dst;
 441         }
 442
 443         /* If there is no association or if a source address is passed, no
 444          * more validation is required.
 445          */
 446         if (!asoc || saddr)
 447                 goto out;
 448
 449         bp = &asoc->base.bind_addr;
 450         addr_lock = &asoc->base.addr_lock;
 451
 452         if (dst) {
 453                 /* Walk through the bind address list and look for a bind
 454                  * address that matches the source address of the returned dst.
 455                  */
 456                 sctp_read_lock(addr_lock);
 457                 list_for_each(pos, &bp->address_list) {
 458                         laddr = list_entry(pos, struct sctp_sockaddr_entry,
 459                                            list);
 460                         if (!laddr->use_as_src)
 461                                 continue;
 462                         sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 463                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 464                                 goto out_unlock;
 465                 }
 466                 sctp_read_unlock(addr_lock);
 467
 468                 /* None of the bound addresses match the source address of the
 469                  * dst. So release it.
 470                  */
 471                 dst_release(dst);
 472                 dst = NULL;
 473         }
 474
 475         /* Walk through the bind address list and try to get a dst that
 476          * matches a bind address as the source address.
 477          */
 478         sctp_read_lock(addr_lock);
 479         list_for_each(pos, &bp->address_list) {
 480                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
 481
 482                 if ((laddr->use_as_src) &&
 483                     (AF_INET == laddr->a.sa.sa_family)) {
 484                         fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
 485                         if (!ip_route_output_key(&rt, &fl)) {
 486                                 dst = &rt->u.dst;
 487                                 goto out_unlock;
 488                         }
 489                 }
 490         }
 491
 492 out_unlock:
 493         sctp_read_unlock(addr_lock);
 494 out:
 495         if (dst)
 496                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
 497                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
 498         else
 499                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 500
 501         return dst;
 502 }
 503
 504 /* For v4, the source address is cached in the route entry(dst). So no need
 505  * to cache it separately and hence this is an empty routine.
 506  */
 507 static void sctp_v4_get_saddr(struct sctp_association *asoc,
 508                               struct dst_entry *dst,
 509                               union sctp_addr *daddr,
 510                               union sctp_addr *saddr)
 511 {
 512         struct rtable *rt = (struct rtable *)dst;
 513
 514         if (!asoc)
 515                 return;
 516
 517         if (rt) {
 518                 saddr->v4.sin_family = AF_INET;
 519                 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 520                 saddr->v4.sin_addr.s_addr = rt->rt_src;
 521         }
 522 }
 523
 524 /* What interface did this skb arrive on? */
 525 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 526 {
 527         return ((struct rtable *)skb->dst)->rt_iif;
 528 }
 529
 530 /* Was this packet marked by Explicit Congestion Notification? */
 531 static int sctp_v4_is_ce(const struct sk_buff *skb)
 532 {
 533         return INET_ECN_is_ce(ip_hdr(skb)->tos);
 534 }
 535
 536 /* Create and initialize a new sk for the socket returned by accept(). */
 537 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 538                                              struct sctp_association *asoc)
 539 {
 540         struct inet_sock *inet = inet_sk(sk);
 541         struct inet_sock *newinet;
 542         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
 543
 544         if (!newsk)
 545                 goto out;
 546
 547         sock_init_data(NULL, newsk);
 548
 549         newsk->sk_type = SOCK_STREAM;
 550
 551         newsk->sk_no_check = sk->sk_no_check;
 552         newsk->sk_reuse = sk->sk_reuse;
 553         newsk->sk_shutdown = sk->sk_shutdown;
 554
 555         newsk->sk_destruct = inet_sock_destruct;
 556         newsk->sk_family = PF_INET;
 557         newsk->sk_protocol = IPPROTO_SCTP;
 558         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 559         sock_reset_flag(newsk, SOCK_ZAPPED);
 560
 561         newinet = inet_sk(newsk);
 562
 563         /* Initialize sk's sport, dport, rcv_saddr and daddr for
 564          * getsockname() and getpeername()
 565          */
 566         newinet->sport = inet->sport;
 567         newinet->saddr = inet->saddr;
 568         newinet->rcv_saddr = inet->rcv_saddr;
 569         newinet->dport = htons(asoc->peer.port);
 570         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 571         newinet->pmtudisc = inet->pmtudisc;
 572         newinet->id = asoc->next_tsn ^ jiffies;
 573
 574         newinet->uc_ttl = -1;
 575         newinet->mc_loop = 1;
 576         newinet->mc_ttl = 1;
 577         newinet->mc_index = 0;
 578         newinet->mc_list = NULL;
 579
 580         sk_refcnt_debug_inc(newsk);
 581
 582         if (newsk->sk_prot->init(newsk)) {
 583                 sk_common_release(newsk);
 584                 newsk = NULL;
 585         }
 586
 587 out:
 588         return newsk;
 589 }
 590
 591 /* Map address, empty for v4 family */
 592 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 593 {
 594         /* Empty */
 595 }
 596
 597 /* Dump the v4 addr to the seq file. */
 598 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 599 {
 600         seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
 601 }
 602
 603 /* Event handler for inet address addition/deletion events.  */
 604 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 605                                void *ptr)
 606 {
 607         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 608         struct sctp_sockaddr_entry *addr;
 609         struct list_head *pos, *temp;
 610
 611         switch (ev) {
 612         case NETDEV_UP:
 613                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 614                 if (addr) {
 615                         addr->a.v4.sin_family = AF_INET;
 616                         addr->a.v4.sin_port = 0;
 617                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 618                         list_add_tail(&addr->list, &sctp_local_addr_list);
 619                 }
 620                 break;
 621         case NETDEV_DOWN:
 622                 list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 623                         addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 624                         if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
 625                                 list_del(pos);
 626                                 kfree(addr);
 627                                 break;
 628                         }
 629                 }
 630
 631                 break;
 632         }
 633
 634         return NOTIFY_DONE;
 635 }
 636
 637 /*
 638  * Initialize the control inode/socket with a control endpoint data
 639  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 640  */
 641 static int sctp_ctl_sock_init(void)
 642 {
 643         int err;
 644         sa_family_t family;
 645
 646         if (sctp_get_pf_specific(PF_INET6))
 647                 family = PF_INET6;
 648         else
 649                 family = PF_INET;
 650
 651         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
 652                                &sctp_ctl_socket);
 653         if (err < 0) {
 654                 printk(KERN_ERR
 655                        "SCTP: Failed to create the SCTP control socket.\n");
 656                 return err;
 657         }
 658         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
 659         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
 660
 661         return 0;
 662 }
 663
 664 /* Register address family specific functions. */
 665 int sctp_register_af(struct sctp_af *af)
 666 {
 667         switch (af->sa_family) {
 668         case AF_INET:
 669                 if (sctp_af_v4_specific)
 670                         return 0;
 671                 sctp_af_v4_specific = af;
 672                 break;
 673         case AF_INET6:
 674                 if (sctp_af_v6_specific)
 675                         return 0;
 676                 sctp_af_v6_specific = af;
 677                 break;
 678         default:
 679                 return 0;
 680         }
 681
 682         INIT_LIST_HEAD(&af->list);
 683         list_add_tail(&af->list, &sctp_address_families);
 684         return 1;
 685 }
 686
 687 /* Get the table of functions for manipulating a particular address
 688  * family.
 689  */
 690 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 691 {
 692         switch (family) {
 693         case AF_INET:
 694                 return sctp_af_v4_specific;
 695         case AF_INET6:
 696                 return sctp_af_v6_specific;
 697         default:
 698                 return NULL;
 699         }
 700 }
 701
 702 /* Common code to initialize a AF_INET msg_name. */
 703 static void sctp_inet_msgname(char *msgname, int *addr_len)
 704 {
 705         struct sockaddr_in *sin;
 706
 707         sin = (struct sockaddr_in *)msgname;
 708         *addr_len = sizeof(struct sockaddr_in);
 709         sin->sin_family = AF_INET;
 710         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 711 }
 712
 713 /* Copy the primary address of the peer primary address as the msg_name. */
 714 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 715                                     int *addr_len)
 716 {
 717         struct sockaddr_in *sin, *sinfrom;
 718
 719         if (msgname) {
 720                 struct sctp_association *asoc;
 721
 722                 asoc = event->asoc;
 723                 sctp_inet_msgname(msgname, addr_len);
 724                 sin = (struct sockaddr_in *)msgname;
 725                 sinfrom = &asoc->peer.primary_addr.v4;
 726                 sin->sin_port = htons(asoc->peer.port);
 727                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 728         }
 729 }
 730
 731 /* Initialize and copy out a msgname from an inbound skb. */
 732 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 733 {
 734         if (msgname) {
 735                 struct sctphdr *sh = sctp_hdr(skb);
 736                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 737
 738                 sctp_inet_msgname(msgname, len);
 739                 sin->sin_port = sh->source;
 740                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 741         }
 742 }
 743
 744 /* Do we support this AF? */
 745 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 746 {
 747         /* PF_INET only supports AF_INET addresses. */
 748         return (AF_INET == family);
 749 }
 750
 751 /* Address matching with wildcards allowed. */
 752 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 753                               const union sctp_addr *addr2,
 754                               struct sctp_sock *opt)
 755 {
 756         /* PF_INET only supports AF_INET addresses. */
 757         if (addr1->sa.sa_family != addr2->sa.sa_family)
 758                 return 0;
 759         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
 760             INADDR_ANY == addr2->v4.sin_addr.s_addr)
 761                 return 1;
 762         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 763                 return 1;
 764
 765         return 0;
 766 }
 767
 768 /* Verify that provided sockaddr looks bindable.  Common verification has
 769  * already been taken care of.
 770  */
 771 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 772 {
 773         return sctp_v4_available(addr, opt);
 774 }
 775
 776 /* Verify that sockaddr looks sendable.  Common verification has already
 777  * been taken care of.
 778  */
 779 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 780 {
 781         return 1;
 782 }
 783
 784 /* Fill in Supported Address Type information for INIT and INIT-ACK
 785  * chunks.  Returns number of addresses supported.
 786  */
 787 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 788                                      __be16 *types)
 789 {
 790         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 791         return 1;
 792 }
 793
 794 /* Wrapper routine that calls the ip transmit routine. */
 795 static inline int sctp_v4_xmit(struct sk_buff *skb,
 796                                struct sctp_transport *transport, int ipfragok)
 797 {
 798         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 799                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
 800                           __FUNCTION__, skb, skb->len,
 801                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
 802                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 803
 804         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 805         return ip_queue_xmit(skb, ipfragok);
 806 }
 807
 808 static struct sctp_af sctp_ipv4_specific;
 809
 810 static struct sctp_pf sctp_pf_inet = {
 811         .event_msgname = sctp_inet_event_msgname,
 812         .skb_msgname   = sctp_inet_skb_msgname,
 813         .af_supported  = sctp_inet_af_supported,
 814         .cmp_addr      = sctp_inet_cmp_addr,
 815         .bind_verify   = sctp_inet_bind_verify,
 816         .send_verify   = sctp_inet_send_verify,
 817         .supported_addrs = sctp_inet_supported_addrs,
 818         .create_accept_sk = sctp_v4_create_accept_sk,
 819         .addr_v4map     = sctp_v4_addr_v4map,
 820         .af            = &sctp_ipv4_specific,
 821 };
 822
 823 /* Notifier for inetaddr addition/deletion events.  */
 824 static struct notifier_block sctp_inetaddr_notifier = {
 825         .notifier_call = sctp_inetaddr_event,
 826 };
 827
 828 /* Socket operations.  */
 829 static const struct proto_ops inet_seqpacket_ops = {
 830         .family            = PF_INET,
 831         .owner             = THIS_MODULE,
 832         .release           = inet_release,      /* Needs to be wrapped... */
 833         .bind              = inet_bind,
 834         .connect           = inet_dgram_connect,
 835         .socketpair        = sock_no_socketpair,
 836         .accept            = inet_accept,
 837         .getname           = inet_getname,      /* Semantics are different.  */
 838         .poll              = sctp_poll,
 839         .ioctl             = inet_ioctl,
 840         .listen            = sctp_inet_listen,
 841         .shutdown          = inet_shutdown,     /* Looks harmless.  */
 842         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 843         .getsockopt        = sock_common_getsockopt,
 844         .sendmsg           = inet_sendmsg,
 845         .recvmsg           = sock_common_recvmsg,
 846         .mmap              = sock_no_mmap,
 847         .sendpage          = sock_no_sendpage,
 848 #ifdef CONFIG_COMPAT
 849         .compat_setsockopt = compat_sock_common_setsockopt,
 850         .compat_getsockopt = compat_sock_common_getsockopt,
 851 #endif
 852 };
 853
 854 /* Registration with AF_INET family.  */
 855 static struct inet_protosw sctp_seqpacket_protosw = {
 856         .type       = SOCK_SEQPACKET,
 857         .protocol   = IPPROTO_SCTP,
 858         .prot       = &sctp_prot,
 859         .ops        = &inet_seqpacket_ops,
 860         .capability = -1,
 861         .no_check   = 0,
 862         .flags      = SCTP_PROTOSW_FLAG
 863 };
 864 static struct inet_protosw sctp_stream_protosw = {
 865         .type       = SOCK_STREAM,
 866         .protocol   = IPPROTO_SCTP,
 867         .prot       = &sctp_prot,
 868         .ops        = &inet_seqpacket_ops,
 869         .capability = -1,
 870         .no_check   = 0,
 871         .flags      = SCTP_PROTOSW_FLAG
 872 };
 873
 874 /* Register with IP layer.  */
 875 static struct net_protocol sctp_protocol = {
 876         .handler     = sctp_rcv,
 877         .err_handler = sctp_v4_err,
 878         .no_policy   = 1,
 879 };
 880
 881 /* IPv4 address related functions.  */
 882 static struct sctp_af sctp_ipv4_specific = {
 883         .sa_family         = AF_INET,
 884         .sctp_xmit         = sctp_v4_xmit,
 885         .setsockopt        = ip_setsockopt,
 886         .getsockopt        = ip_getsockopt,
 887         .get_dst           = sctp_v4_get_dst,
 888         .get_saddr         = sctp_v4_get_saddr,
 889         .copy_addrlist     = sctp_v4_copy_addrlist,
 890         .from_skb          = sctp_v4_from_skb,
 891         .from_sk           = sctp_v4_from_sk,
 892         .to_sk_saddr       = sctp_v4_to_sk_saddr,
 893         .to_sk_daddr       = sctp_v4_to_sk_daddr,
 894         .from_addr_param   = sctp_v4_from_addr_param,
 895         .to_addr_param     = sctp_v4_to_addr_param,
 896         .dst_saddr         = sctp_v4_dst_saddr,
 897         .cmp_addr          = sctp_v4_cmp_addr,
 898         .addr_valid        = sctp_v4_addr_valid,
 899         .inaddr_any        = sctp_v4_inaddr_any,
 900         .is_any            = sctp_v4_is_any,
 901         .available         = sctp_v4_available,
 902         .scope             = sctp_v4_scope,
 903         .skb_iif           = sctp_v4_skb_iif,
 904         .is_ce             = sctp_v4_is_ce,
 905         .seq_dump_addr     = sctp_v4_seq_dump_addr,
 906         .net_header_len    = sizeof(struct iphdr),
 907         .sockaddr_len      = sizeof(struct sockaddr_in),
 908 #ifdef CONFIG_COMPAT
 909         .compat_setsockopt = compat_ip_setsockopt,
 910         .compat_getsockopt = compat_ip_getsockopt,
 911 #endif
 912 };
 913
 914 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 915
 916         switch (family) {
 917         case PF_INET:
 918                 return sctp_pf_inet_specific;
 919         case PF_INET6:
 920                 return sctp_pf_inet6_specific;
 921         default:
 922                 return NULL;
 923         }
 924 }
 925
 926 /* Register the PF specific function table.  */
 927 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 928 {
 929         switch (family) {
 930         case PF_INET:
 931                 if (sctp_pf_inet_specific)
 932                         return 0;
 933                 sctp_pf_inet_specific = pf;
 934                 break;
 935         case PF_INET6:
 936                 if (sctp_pf_inet6_specific)
 937                         return 0;
 938                 sctp_pf_inet6_specific = pf;
 939                 break;
 940         default:
 941                 return 0;
 942         }
 943         return 1;
 944 }
 945
 946 static int __init init_sctp_mibs(void)
 947 {
 948         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
 949         if (!sctp_statistics[0])
 950                 return -ENOMEM;
 951         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
 952         if (!sctp_statistics[1]) {
 953                 free_percpu(sctp_statistics[0]);
 954                 return -ENOMEM;
 955         }
 956         return 0;
 957
 958 }
 959
 960 static void cleanup_sctp_mibs(void)
 961 {
 962         free_percpu(sctp_statistics[0]);
 963         free_percpu(sctp_statistics[1]);
 964 }
 965
 966 /* Initialize the universe into something sensible.  */
 967 SCTP_STATIC __init int sctp_init(void)
 968 {
 969         int i;
 970         int status = -EINVAL;
 971         unsigned long goal;
 972         int order;
 973
 974         /* SCTP_DEBUG sanity check. */
 975         if (!sctp_sanity_check())
 976                 goto out;
 977
 978         status = proto_register(&sctp_prot, 1);
 979         if (status)
 980                 goto out;
 981
 982         /* Add SCTP to inet_protos hash table.  */
 983         status = -EAGAIN;
 984         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
 985                 goto err_add_protocol;
 986
 987         /* Add SCTP(TCP and UDP style) to inetsw linked list.  */
 988         inet_register_protosw(&sctp_seqpacket_protosw);
 989         inet_register_protosw(&sctp_stream_protosw);
 990
 991         /* Allocate a cache pools. */
 992         status = -ENOBUFS;
 993         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
 994                                                sizeof(struct sctp_bind_bucket),
 995                                                0, SLAB_HWCACHE_ALIGN,
 996                                                NULL, NULL);
 997
 998         if (!sctp_bucket_cachep)
 999                 goto err_bucket_cachep;
1000
1001         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1002                                                sizeof(struct sctp_chunk),
1003                                                0, SLAB_HWCACHE_ALIGN,
1004                                                NULL, NULL);
1005         if (!sctp_chunk_cachep)
1006                 goto err_chunk_cachep;
1007
1008         /* Allocate and initialise sctp mibs.  */
1009         status = init_sctp_mibs();
1010         if (status)
1011                 goto err_init_mibs;
1012
1013         /* Initialize proc fs directory.  */
1014         status = sctp_proc_init();
1015         if (status)
1016                 goto err_init_proc;
1017
1018         /* Initialize object count debugging.  */
1019         sctp_dbg_objcnt_init();
1020
1021         /* Initialize the SCTP specific PF functions. */
1022         sctp_register_pf(&sctp_pf_inet, PF_INET);
1023         /*
1024          * 14. Suggested SCTP Protocol Parameter Values
1025          */
1026         /* The following protocol parameters are RECOMMENDED:  */
1027         /* RTO.Initial              - 3  seconds */
1028         sctp_rto_initial                = SCTP_RTO_INITIAL;
1029         /* RTO.Min                  - 1  second */
1030         sctp_rto_min                    = SCTP_RTO_MIN;
1031         /* RTO.Max                 -  60 seconds */
1032         sctp_rto_max                    = SCTP_RTO_MAX;
1033         /* RTO.Alpha                - 1/8 */
1034         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1035         /* RTO.Beta                 - 1/4 */
1036         sctp_rto_beta                   = SCTP_RTO_BETA;
1037
1038         /* Valid.Cookie.Life        - 60  seconds */
1039         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1040
1041         /* Whether Cookie Preservative is enabled(1) or not(0) */
1042         sctp_cookie_preserve_enable     = 1;
1043
1044         /* Max.Burst                - 4 */
1045         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1046
1047         /* Association.Max.Retrans  - 10 attempts
1048          * Path.Max.Retrans         - 5  attempts (per destination address)
1049          * Max.Init.Retransmits     - 8  attempts
1050          */
1051         sctp_max_retrans_association    = 10;
1052         sctp_max_retrans_path           = 5;
1053         sctp_max_retrans_init           = 8;
1054
1055         /* Sendbuffer growth        - do per-socket accounting */
1056         sctp_sndbuf_policy              = 0;
1057
1058         /* Rcvbuffer growth         - do per-socket accounting */
1059         sctp_rcvbuf_policy              = 0;
1060
1061         /* HB.interval              - 30 seconds */
1062         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1063
1064         /* delayed SACK timeout */
1065         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1066
1067         /* Implementation specific variables. */
1068
1069         /* Initialize default stream count setup information. */
1070         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1071         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1072
1073         /* Initialize handle used for association ids. */
1074         idr_init(&sctp_assocs_id);
1075
1076         /* Size and allocate the association hash table.
1077          * The methodology is similar to that of the tcp hash tables.
1078          */
1079         if (num_physpages >= (128 * 1024))
1080                 goal = num_physpages >> (22 - PAGE_SHIFT);
1081         else
1082                 goal = num_physpages >> (24 - PAGE_SHIFT);
1083
1084         for (order = 0; (1UL << order) < goal; order++)
1085                 ;
1086
1087         do {
1088                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1089                                         sizeof(struct sctp_hashbucket);
1090                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1091                         continue;
1092                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1093                                         __get_free_pages(GFP_ATOMIC, order);
1094         } while (!sctp_assoc_hashtable && --order > 0);
1095         if (!sctp_assoc_hashtable) {
1096                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1097                 status = -ENOMEM;
1098                 goto err_ahash_alloc;
1099         }
1100         for (i = 0; i < sctp_assoc_hashsize; i++) {
1101                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1102                 sctp_assoc_hashtable[i].chain = NULL;
1103         }
1104
1105         /* Allocate and initialize the endpoint hash table.  */
1106         sctp_ep_hashsize = 64;
1107         sctp_ep_hashtable = (struct sctp_hashbucket *)
1108                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1109         if (!sctp_ep_hashtable) {
1110                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1111                 status = -ENOMEM;
1112                 goto err_ehash_alloc;
1113         }
1114         for (i = 0; i < sctp_ep_hashsize; i++) {
1115                 rwlock_init(&sctp_ep_hashtable[i].lock);
1116                 sctp_ep_hashtable[i].chain = NULL;
1117         }
1118
1119         /* Allocate and initialize the SCTP port hash table.  */
1120         do {
1121                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1122                                         sizeof(struct sctp_bind_hashbucket);
1123                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1124                         continue;
1125                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1126                                         __get_free_pages(GFP_ATOMIC, order);
1127         } while (!sctp_port_hashtable && --order > 0);
1128         if (!sctp_port_hashtable) {
1129                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1130                 status = -ENOMEM;
1131                 goto err_bhash_alloc;
1132         }
1133         for (i = 0; i < sctp_port_hashsize; i++) {
1134                 spin_lock_init(&sctp_port_hashtable[i].lock);
1135                 sctp_port_hashtable[i].chain = NULL;
1136         }
1137
1138         spin_lock_init(&sctp_port_alloc_lock);
1139         sctp_port_rover = sysctl_local_port_range[0] - 1;
1140
1141         printk(KERN_INFO "SCTP: Hash tables configured "
1142                          "(established %d bind %d)\n",
1143                 sctp_assoc_hashsize, sctp_port_hashsize);
1144
1145         /* Disable ADDIP by default. */
1146         sctp_addip_enable = 0;
1147
1148         /* Enable PR-SCTP by default. */
1149         sctp_prsctp_enable = 1;
1150
1151         sctp_sysctl_register();
1152
1153         INIT_LIST_HEAD(&sctp_address_families);
1154         sctp_register_af(&sctp_ipv4_specific);
1155
1156         status = sctp_v6_init();
1157         if (status)
1158                 goto err_v6_init;
1159
1160         /* Initialize the control inode/socket for handling OOTB packets.  */
1161         if ((status = sctp_ctl_sock_init())) {
1162                 printk (KERN_ERR
1163                         "SCTP: Failed to initialize the SCTP control sock.\n");
1164                 goto err_ctl_sock_init;
1165         }
1166
1167         /* Initialize the local address list. */
1168         INIT_LIST_HEAD(&sctp_local_addr_list);
1169
1170         sctp_get_local_addr_list();
1171
1172         /* Register notifier for inet address additions/deletions. */
1173         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1174
1175         __unsafe(THIS_MODULE);
1176         status = 0;
1177 out:
1178         return status;
1179 err_ctl_sock_init:
1180         sctp_v6_exit();
1181 err_v6_init:
1182         sctp_sysctl_unregister();
1183         list_del(&sctp_ipv4_specific.list);
1184         free_pages((unsigned long)sctp_port_hashtable,
1185                    get_order(sctp_port_hashsize *
1186                              sizeof(struct sctp_bind_hashbucket)));
1187 err_bhash_alloc:
1188         kfree(sctp_ep_hashtable);
1189 err_ehash_alloc:
1190         free_pages((unsigned long)sctp_assoc_hashtable,
1191                    get_order(sctp_assoc_hashsize *
1192                              sizeof(struct sctp_hashbucket)));
1193 err_ahash_alloc:
1194         sctp_dbg_objcnt_exit();
1195 err_init_proc:
1196         sctp_proc_exit();
1197         cleanup_sctp_mibs();
1198 err_init_mibs:
1199         kmem_cache_destroy(sctp_chunk_cachep);
1200 err_chunk_cachep:
1201         kmem_cache_destroy(sctp_bucket_cachep);
1202 err_bucket_cachep:
1203         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1204         inet_unregister_protosw(&sctp_seqpacket_protosw);
1205         inet_unregister_protosw(&sctp_stream_protosw);
1206 err_add_protocol:
1207         proto_unregister(&sctp_prot);
1208         goto out;
1209 }
1210
1211 /* Exit handler for the SCTP protocol.  */
1212 SCTP_STATIC __exit void sctp_exit(void)
1213 {
1214         /* BUG.  This should probably do something useful like clean
1215          * up all the remaining associations and all that memory.
1216          */
1217
1218         /* Unregister notifier for inet address additions/deletions. */
1219         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1220
1221         /* Free the local address list.  */
1222         sctp_free_local_addr_list();
1223
1224         /* Free the control endpoint.  */
1225         sock_release(sctp_ctl_socket);
1226
1227         sctp_v6_exit();
1228         sctp_sysctl_unregister();
1229         list_del(&sctp_ipv4_specific.list);
1230
1231         free_pages((unsigned long)sctp_assoc_hashtable,
1232                    get_order(sctp_assoc_hashsize *
1233                              sizeof(struct sctp_hashbucket)));
1234         kfree(sctp_ep_hashtable);
1235         free_pages((unsigned long)sctp_port_hashtable,
1236                    get_order(sctp_port_hashsize *
1237                              sizeof(struct sctp_bind_hashbucket)));
1238
1239         kmem_cache_destroy(sctp_chunk_cachep);
1240         kmem_cache_destroy(sctp_bucket_cachep);
1241
1242         sctp_dbg_objcnt_exit();
1243         sctp_proc_exit();
1244         cleanup_sctp_mibs();
1245
1246         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1247         inet_unregister_protosw(&sctp_seqpacket_protosw);
1248         inet_unregister_protosw(&sctp_stream_protosw);
1249         proto_unregister(&sctp_prot);
1250 }
1251
1252 module_init(sctp_init);
1253 module_exit(sctp_exit);
1254
1255 /*
1256  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1257  */
1258 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1259 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1260 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1261 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1262 MODULE_LICENSE("GPL");