net/sctp/protocol.c

   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 kmem_cache_t *sctp_chunk_cachep __read_mostly;
  83 kmem_cache_t *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                         addr->a_h = addr->a;
 157                         list_add_tail(&addr->list, addrlist);
 158                 }
 159         }
 160
 161         rcu_read_unlock();
 162 }
 163
 164 /* Extract our IP addresses from the system and stash them in the
 165  * protocol structure.
 166  */
 167 static void __sctp_get_local_addr_list(void)
 168 {
 169         struct net_device *dev;
 170         struct list_head *pos;
 171         struct sctp_af *af;
 172
 173         read_lock(&dev_base_lock);
 174         for (dev = dev_base; dev; dev = dev->next) {
 175                 __list_for_each(pos, &sctp_address_families) {
 176                         af = list_entry(pos, struct sctp_af, list);
 177                         af->copy_addrlist(&sctp_local_addr_list, dev);
 178                 }
 179         }
 180         read_unlock(&dev_base_lock);
 181 }
 182
 183 static void sctp_get_local_addr_list(void)
 184 {
 185         unsigned long flags;
 186
 187         sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
 188         __sctp_get_local_addr_list();
 189         sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
 190 }
 191
 192 /* Free the existing local addresses.  */
 193 static void __sctp_free_local_addr_list(void)
 194 {
 195         struct sctp_sockaddr_entry *addr;
 196         struct list_head *pos, *temp;
 197
 198         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 199                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 200                 list_del(pos);
 201                 kfree(addr);
 202         }
 203 }
 204
 205 /* Free the existing local addresses.  */
 206 static void sctp_free_local_addr_list(void)
 207 {
 208         unsigned long flags;
 209
 210         sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
 211         __sctp_free_local_addr_list();
 212         sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
 213 }
 214
 215 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 216 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 217                               gfp_t gfp, int copy_flags)
 218 {
 219         struct sctp_sockaddr_entry *addr;
 220         int error = 0;
 221         struct list_head *pos;
 222         unsigned long flags;
 223
 224         sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
 225         list_for_each(pos, &sctp_local_addr_list) {
 226                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 227                 if (sctp_in_scope(&addr->a_h, scope)) {
 228                         /* Now that the address is in scope, check to see if
 229                          * the address type is really supported by the local
 230                          * sock as well as the remote peer.
 231                          */
 232                         if ((((AF_INET == addr->a_h.sa.sa_family) &&
 233                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 234                             (((AF_INET6 == addr->a_h.sa.sa_family) &&
 235                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
 236                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 237                                 error = sctp_add_bind_addr(bp, &addr->a_h, 1,
 238                                                            GFP_ATOMIC);
 239                                 if (error)
 240                                         goto end_copy;
 241                         }
 242                 }
 243         }
 244
 245 end_copy:
 246         sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
 247         return error;
 248 }
 249
 250 /* Initialize a sctp_addr from in incoming skb.  */
 251 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 252                              int is_saddr)
 253 {
 254         void *from;
 255         __u16 *port;
 256         struct sctphdr *sh;
 257
 258         port = &addr->v4.sin_port;
 259         addr->v4.sin_family = AF_INET;
 260
 261         sh = (struct sctphdr *) skb->h.raw;
 262         if (is_saddr) {
 263                 *port  = ntohs(sh->source);
 264                 from = &skb->nh.iph->saddr;
 265         } else {
 266                 *port = ntohs(sh->dest);
 267                 from = &skb->nh.iph->daddr;
 268         }
 269         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 270 }
 271
 272 /* Initialize an sctp_addr from a socket. */
 273 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 274 {
 275         addr->v4.sin_family = AF_INET;
 276         addr->v4.sin_port = inet_sk(sk)->num;
 277         addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
 278 }
 279
 280 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
 281 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 282 {
 283         inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
 284 }
 285
 286 /* Initialize sk->sk_daddr from sctp_addr. */
 287 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 288 {
 289         inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
 290 }
 291
 292 /* Initialize a sctp_addr from an address parameter. */
 293 static void sctp_v4_from_addr_param(union sctp_addr *addr,
 294                                     union sctp_addr_param *param,
 295                                     __u16 port, int iif)
 296 {
 297         addr->v4.sin_family = AF_INET;
 298         addr->v4.sin_port = port;
 299         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 300 }
 301
 302 /* Initialize an address parameter from a sctp_addr and return the length
 303  * of the address parameter.
 304  */
 305 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 306                                  union sctp_addr_param *param)
 307 {
 308         int length = sizeof(sctp_ipv4addr_param_t);
 309
 310         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 311         param->v4.param_hdr.length = htons(length);
 312         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 313
 314         return length;
 315 }
 316
 317 /* Initialize a sctp_addr from a dst_entry. */
 318 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
 319                               unsigned short port)
 320 {
 321         struct rtable *rt = (struct rtable *)dst;
 322         saddr->v4.sin_family = AF_INET;
 323         saddr->v4.sin_port = port;
 324         saddr->v4.sin_addr.s_addr = rt->rt_src;
 325 }
 326
 327 /* Compare two addresses exactly. */
 328 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 329                             const union sctp_addr *addr2)
 330 {
 331         if (addr1->sa.sa_family != addr2->sa.sa_family)
 332                 return 0;
 333         if (addr1->v4.sin_port != addr2->v4.sin_port)
 334                 return 0;
 335         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 336                 return 0;
 337
 338         return 1;
 339 }
 340
 341 /* Initialize addr struct to INADDR_ANY. */
 342 static void sctp_v4_inaddr_any(union sctp_addr *addr, unsigned short port)
 343 {
 344         addr->v4.sin_family = AF_INET;
 345         addr->v4.sin_addr.s_addr = INADDR_ANY;
 346         addr->v4.sin_port = port;
 347 }
 348
 349 /* Is this a wildcard address? */
 350 static int sctp_v4_is_any(const union sctp_addr *addr)
 351 {
 352         return INADDR_ANY == addr->v4.sin_addr.s_addr;
 353 }
 354
 355 /* This function checks if the address is a valid address to be used for
 356  * SCTP binding.
 357  *
 358  * Output:
 359  * Return 0 - If the address is a non-unicast or an illegal address.
 360  * Return 1 - If the address is a unicast.
 361  */
 362 static int sctp_v4_addr_valid(union sctp_addr *addr,
 363                               struct sctp_sock *sp,
 364                               const struct sk_buff *skb)
 365 {
 366         /* Is this a non-unicast address or a unusable SCTP address? */
 367         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
 368                 return 0;
 369
 370         /* Is this a broadcast address? */
 371         if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
 372                 return 0;
 373
 374         return 1;
 375 }
 376
 377 /* Should this be available for binding?   */
 378 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 379 {
 380         int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
 381
 382
 383         if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
 384            ret != RTN_LOCAL &&
 385            !sp->inet.freebind &&
 386            !sysctl_ip_nonlocal_bind)
 387                 return 0;
 388
 389         return 1;
 390 }
 391
 392 /* Checking the loopback, private and other address scopes as defined in
 393  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 394  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 395  *
 396  * Level 0 - unusable SCTP addresses
 397  * Level 1 - loopback address
 398  * Level 2 - link-local addresses
 399  * Level 3 - private addresses.
 400  * Level 4 - global addresses
 401  * For INIT and INIT-ACK address list, let L be the level of
 402  * of requested destination address, sender and receiver
 403  * SHOULD include all of its addresses with level greater
 404  * than or equal to L.
 405  */
 406 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 407 {
 408         sctp_scope_t retval;
 409
 410         /* Should IPv4 scoping be a sysctl configurable option
 411          * so users can turn it off (default on) for certain
 412          * unconventional networking environments?
 413          */
 414
 415         /* Check for unusable SCTP addresses. */
 416         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 417                 retval =  SCTP_SCOPE_UNUSABLE;
 418         } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
 419                 retval = SCTP_SCOPE_LOOPBACK;
 420         } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 421                 retval = SCTP_SCOPE_LINK;
 422         } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 423                 retval = SCTP_SCOPE_PRIVATE;
 424         } else {
 425                 retval = SCTP_SCOPE_GLOBAL;
 426         }
 427
 428         return retval;
 429 }
 430
 431 /* Returns a valid dst cache entry for the given source and destination ip
 432  * addresses. If an association is passed, trys to get a dst entry with a
 433  * source address that matches an address in the bind address list.
 434  */
 435 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
 436                                          union sctp_addr *daddr,
 437                                          union sctp_addr *saddr)
 438 {
 439         struct rtable *rt;
 440         struct flowi fl;
 441         struct sctp_bind_addr *bp;
 442         rwlock_t *addr_lock;
 443         struct sctp_sockaddr_entry *laddr;
 444         struct list_head *pos;
 445         struct dst_entry *dst = NULL;
 446         union sctp_addr dst_saddr;
 447
 448         memset(&fl, 0x0, sizeof(struct flowi));
 449         fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 450         fl.proto = IPPROTO_SCTP;
 451         if (asoc) {
 452                 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
 453                 fl.oif = asoc->base.sk->sk_bound_dev_if;
 454         }
 455         if (saddr)
 456                 fl.fl4_src = saddr->v4.sin_addr.s_addr;
 457
 458         SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
 459                           __FUNCTION__, NIPQUAD(fl.fl4_dst),
 460                           NIPQUAD(fl.fl4_src));
 461
 462         if (!ip_route_output_key(&rt, &fl)) {
 463                 dst = &rt->u.dst;
 464         }
 465
 466         /* If there is no association or if a source address is passed, no
 467          * more validation is required.
 468          */
 469         if (!asoc || saddr)
 470                 goto out;
 471
 472         bp = &asoc->base.bind_addr;
 473         addr_lock = &asoc->base.addr_lock;
 474
 475         if (dst) {
 476                 /* Walk through the bind address list and look for a bind
 477                  * address that matches the source address of the returned dst.
 478                  */
 479                 sctp_read_lock(addr_lock);
 480                 list_for_each(pos, &bp->address_list) {
 481                         union sctp_addr tmp;
 482                         laddr = list_entry(pos, struct sctp_sockaddr_entry,
 483                                            list);
 484                         if (!laddr->use_as_src)
 485                                 continue;
 486                         sctp_v4_dst_saddr(&dst_saddr, dst, bp->port);
 487                         flip_to_n(&tmp, &dst_saddr);
 488                         if (sctp_v4_cmp_addr(&tmp, &laddr->a))
 489                                 goto out_unlock;
 490                 }
 491                 sctp_read_unlock(addr_lock);
 492
 493                 /* None of the bound addresses match the source address of the
 494                  * dst. So release it.
 495                  */
 496                 dst_release(dst);
 497                 dst = NULL;
 498         }
 499
 500         /* Walk through the bind address list and try to get a dst that
 501          * matches a bind address as the source address.
 502          */
 503         sctp_read_lock(addr_lock);
 504         list_for_each(pos, &bp->address_list) {
 505                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
 506
 507                 if ((laddr->use_as_src) &&
 508                     (AF_INET == laddr->a_h.sa.sa_family)) {
 509                         fl.fl4_src = laddr->a_h.v4.sin_addr.s_addr;
 510                         if (!ip_route_output_key(&rt, &fl)) {
 511                                 dst = &rt->u.dst;
 512                                 goto out_unlock;
 513                         }
 514                 }
 515         }
 516
 517 out_unlock:
 518         sctp_read_unlock(addr_lock);
 519 out:
 520         if (dst)
 521                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
 522                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
 523         else
 524                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 525
 526         return dst;
 527 }
 528
 529 /* For v4, the source address is cached in the route entry(dst). So no need
 530  * to cache it separately and hence this is an empty routine.
 531  */
 532 static void sctp_v4_get_saddr(struct sctp_association *asoc,
 533                               struct dst_entry *dst,
 534                               union sctp_addr *daddr,
 535                               union sctp_addr *saddr)
 536 {
 537         struct rtable *rt = (struct rtable *)dst;
 538
 539         if (!asoc)
 540                 return;
 541
 542         if (rt) {
 543                 saddr->v4.sin_family = AF_INET;
 544                 saddr->v4.sin_port = asoc->base.bind_addr.port;
 545                 saddr->v4.sin_addr.s_addr = rt->rt_src;
 546         }
 547 }
 548
 549 /* What interface did this skb arrive on? */
 550 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 551 {
 552         return ((struct rtable *)skb->dst)->rt_iif;
 553 }
 554
 555 /* Was this packet marked by Explicit Congestion Notification? */
 556 static int sctp_v4_is_ce(const struct sk_buff *skb)
 557 {
 558         return INET_ECN_is_ce(skb->nh.iph->tos);
 559 }
 560
 561 /* Create and initialize a new sk for the socket returned by accept(). */
 562 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 563                                              struct sctp_association *asoc)
 564 {
 565         struct inet_sock *inet = inet_sk(sk);
 566         struct inet_sock *newinet;
 567         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
 568
 569         if (!newsk)
 570                 goto out;
 571
 572         sock_init_data(NULL, newsk);
 573
 574         newsk->sk_type = SOCK_STREAM;
 575
 576         newsk->sk_no_check = sk->sk_no_check;
 577         newsk->sk_reuse = sk->sk_reuse;
 578         newsk->sk_shutdown = sk->sk_shutdown;
 579
 580         newsk->sk_destruct = inet_sock_destruct;
 581         newsk->sk_family = PF_INET;
 582         newsk->sk_protocol = IPPROTO_SCTP;
 583         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 584         sock_reset_flag(newsk, SOCK_ZAPPED);
 585
 586         newinet = inet_sk(newsk);
 587
 588         /* Initialize sk's sport, dport, rcv_saddr and daddr for
 589          * getsockname() and getpeername()
 590          */
 591         newinet->sport = inet->sport;
 592         newinet->saddr = inet->saddr;
 593         newinet->rcv_saddr = inet->rcv_saddr;
 594         newinet->dport = htons(asoc->peer.port);
 595         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 596         newinet->pmtudisc = inet->pmtudisc;
 597         newinet->id = asoc->next_tsn ^ jiffies;
 598
 599         newinet->uc_ttl = -1;
 600         newinet->mc_loop = 1;
 601         newinet->mc_ttl = 1;
 602         newinet->mc_index = 0;
 603         newinet->mc_list = NULL;
 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, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
 626 }
 627
 628 /* Event handler for inet address addition/deletion events.
 629  * Basically, whenever there is an event, we re-build our local address list.
 630  */
 631 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 632                         void *ptr)
 633 {
 634         unsigned long flags;
 635
 636         sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
 637         __sctp_free_local_addr_list();
 638         __sctp_get_local_addr_list();
 639         sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
 640
 641         return NOTIFY_DONE;
 642 }
 643
 644 /*
 645  * Initialize the control inode/socket with a control endpoint data
 646  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 647  */
 648 static int sctp_ctl_sock_init(void)
 649 {
 650         int err;
 651         sa_family_t family;
 652
 653         if (sctp_get_pf_specific(PF_INET6))
 654                 family = PF_INET6;
 655         else
 656                 family = PF_INET;
 657
 658         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
 659                                &sctp_ctl_socket);
 660         if (err < 0) {
 661                 printk(KERN_ERR
 662                        "SCTP: Failed to create the SCTP control socket.\n");
 663                 return err;
 664         }
 665         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
 666         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
 667
 668         return 0;
 669 }
 670
 671 /* Register address family specific functions. */
 672 int sctp_register_af(struct sctp_af *af)
 673 {
 674         switch (af->sa_family) {
 675         case AF_INET:
 676                 if (sctp_af_v4_specific)
 677                         return 0;
 678                 sctp_af_v4_specific = af;
 679                 break;
 680         case AF_INET6:
 681                 if (sctp_af_v6_specific)
 682                         return 0;
 683                 sctp_af_v6_specific = af;
 684                 break;
 685         default:
 686                 return 0;
 687         }
 688
 689         INIT_LIST_HEAD(&af->list);
 690         list_add_tail(&af->list, &sctp_address_families);
 691         return 1;
 692 }
 693
 694 /* Get the table of functions for manipulating a particular address
 695  * family.
 696  */
 697 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 698 {
 699         switch (family) {
 700         case AF_INET:
 701                 return sctp_af_v4_specific;
 702         case AF_INET6:
 703                 return sctp_af_v6_specific;
 704         default:
 705                 return NULL;
 706         }
 707 }
 708
 709 /* Common code to initialize a AF_INET msg_name. */
 710 static void sctp_inet_msgname(char *msgname, int *addr_len)
 711 {
 712         struct sockaddr_in *sin;
 713
 714         sin = (struct sockaddr_in *)msgname;
 715         *addr_len = sizeof(struct sockaddr_in);
 716         sin->sin_family = AF_INET;
 717         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 718 }
 719
 720 /* Copy the primary address of the peer primary address as the msg_name. */
 721 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 722                                     int *addr_len)
 723 {
 724         struct sockaddr_in *sin, *sinfrom;
 725
 726         if (msgname) {
 727                 struct sctp_association *asoc;
 728
 729                 asoc = event->asoc;
 730                 sctp_inet_msgname(msgname, addr_len);
 731                 sin = (struct sockaddr_in *)msgname;
 732                 sinfrom = &asoc->peer.primary_addr.v4;
 733                 sin->sin_port = htons(asoc->peer.port);
 734                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 735         }
 736 }
 737
 738 /* Initialize and copy out a msgname from an inbound skb. */
 739 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 740 {
 741         struct sctphdr *sh;
 742         struct sockaddr_in *sin;
 743
 744         if (msgname) {
 745                 sctp_inet_msgname(msgname, len);
 746                 sin = (struct sockaddr_in *)msgname;
 747                 sh = (struct sctphdr *)skb->h.raw;
 748                 sin->sin_port = sh->source;
 749                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 750         }
 751 }
 752
 753 /* Do we support this AF? */
 754 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 755 {
 756         /* PF_INET only supports AF_INET addresses. */
 757         return (AF_INET == family);
 758 }
 759
 760 /* Address matching with wildcards allowed. */
 761 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 762                               const union sctp_addr *addr2,
 763                               struct sctp_sock *opt)
 764 {
 765         /* PF_INET only supports AF_INET addresses. */
 766         if (addr1->sa.sa_family != addr2->sa.sa_family)
 767                 return 0;
 768         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
 769             INADDR_ANY == addr2->v4.sin_addr.s_addr)
 770                 return 1;
 771         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 772                 return 1;
 773
 774         return 0;
 775 }
 776
 777 /* Verify that provided sockaddr looks bindable.  Common verification has
 778  * already been taken care of.
 779  */
 780 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 781 {
 782         return sctp_v4_available(addr, opt);
 783 }
 784
 785 /* Verify that sockaddr looks sendable.  Common verification has already
 786  * been taken care of.
 787  */
 788 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 789 {
 790         return 1;
 791 }
 792
 793 /* Fill in Supported Address Type information for INIT and INIT-ACK
 794  * chunks.  Returns number of addresses supported.
 795  */
 796 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 797                                      __u16 *types)
 798 {
 799         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 800         return 1;
 801 }
 802
 803 /* Wrapper routine that calls the ip transmit routine. */
 804 static inline int sctp_v4_xmit(struct sk_buff *skb,
 805                                struct sctp_transport *transport, int ipfragok)
 806 {
 807         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 808                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
 809                           __FUNCTION__, skb, skb->len,
 810                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
 811                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 812
 813         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 814         return ip_queue_xmit(skb, skb->sk, ipfragok);
 815 }
 816
 817 static struct sctp_af sctp_ipv4_specific;
 818
 819 static struct sctp_pf sctp_pf_inet = {
 820         .event_msgname = sctp_inet_event_msgname,
 821         .skb_msgname   = sctp_inet_skb_msgname,
 822         .af_supported  = sctp_inet_af_supported,
 823         .cmp_addr      = sctp_inet_cmp_addr,
 824         .bind_verify   = sctp_inet_bind_verify,
 825         .send_verify   = sctp_inet_send_verify,
 826         .supported_addrs = sctp_inet_supported_addrs,
 827         .create_accept_sk = sctp_v4_create_accept_sk,
 828         .addr_v4map     = sctp_v4_addr_v4map,
 829         .af            = &sctp_ipv4_specific,
 830 };
 831
 832 /* Notifier for inetaddr addition/deletion events.  */
 833 static struct notifier_block sctp_inetaddr_notifier = {
 834         .notifier_call = sctp_inetaddr_event,
 835 };
 836
 837 /* Socket operations.  */
 838 static const struct proto_ops inet_seqpacket_ops = {
 839         .family            = PF_INET,
 840         .owner             = THIS_MODULE,
 841         .release           = inet_release,      /* Needs to be wrapped... */
 842         .bind              = inet_bind,
 843         .connect           = inet_dgram_connect,
 844         .socketpair        = sock_no_socketpair,
 845         .accept            = inet_accept,
 846         .getname           = inet_getname,      /* Semantics are different.  */
 847         .poll              = sctp_poll,
 848         .ioctl             = inet_ioctl,
 849         .listen            = sctp_inet_listen,
 850         .shutdown          = inet_shutdown,     /* Looks harmless.  */
 851         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 852         .getsockopt        = sock_common_getsockopt,
 853         .sendmsg           = inet_sendmsg,
 854         .recvmsg           = sock_common_recvmsg,
 855         .mmap              = sock_no_mmap,
 856         .sendpage          = sock_no_sendpage,
 857 #ifdef CONFIG_COMPAT
 858         .compat_setsockopt = compat_sock_common_setsockopt,
 859         .compat_getsockopt = compat_sock_common_getsockopt,
 860 #endif
 861 };
 862
 863 /* Registration with AF_INET family.  */
 864 static struct inet_protosw sctp_seqpacket_protosw = {
 865         .type       = SOCK_SEQPACKET,
 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 static struct inet_protosw sctp_stream_protosw = {
 874         .type       = SOCK_STREAM,
 875         .protocol   = IPPROTO_SCTP,
 876         .prot       = &sctp_prot,
 877         .ops        = &inet_seqpacket_ops,
 878         .capability = -1,
 879         .no_check   = 0,
 880         .flags      = SCTP_PROTOSW_FLAG
 881 };
 882
 883 /* Register with IP layer.  */
 884 static struct net_protocol sctp_protocol = {
 885         .handler     = sctp_rcv,
 886         .err_handler = sctp_v4_err,
 887         .no_policy   = 1,
 888 };
 889
 890 /* IPv4 address related functions.  */
 891 static struct sctp_af sctp_ipv4_specific = {
 892         .sa_family         = AF_INET,
 893         .sctp_xmit         = sctp_v4_xmit,
 894         .setsockopt        = ip_setsockopt,
 895         .getsockopt        = ip_getsockopt,
 896         .get_dst           = sctp_v4_get_dst,
 897         .get_saddr         = sctp_v4_get_saddr,
 898         .copy_addrlist     = sctp_v4_copy_addrlist,
 899         .from_skb          = sctp_v4_from_skb,
 900         .from_sk           = sctp_v4_from_sk,
 901         .to_sk_saddr       = sctp_v4_to_sk_saddr,
 902         .to_sk_daddr       = sctp_v4_to_sk_daddr,
 903         .from_addr_param   = sctp_v4_from_addr_param,
 904         .to_addr_param     = sctp_v4_to_addr_param,
 905         .dst_saddr         = sctp_v4_dst_saddr,
 906         .cmp_addr          = sctp_v4_cmp_addr,
 907         .addr_valid        = sctp_v4_addr_valid,
 908         .inaddr_any        = sctp_v4_inaddr_any,
 909         .is_any            = sctp_v4_is_any,
 910         .available         = sctp_v4_available,
 911         .scope             = sctp_v4_scope,
 912         .skb_iif           = sctp_v4_skb_iif,
 913         .is_ce             = sctp_v4_is_ce,
 914         .seq_dump_addr     = sctp_v4_seq_dump_addr,
 915         .net_header_len    = sizeof(struct iphdr),
 916         .sockaddr_len      = sizeof(struct sockaddr_in),
 917 #ifdef CONFIG_COMPAT
 918         .compat_setsockopt = compat_ip_setsockopt,
 919         .compat_getsockopt = compat_ip_getsockopt,
 920 #endif
 921 };
 922
 923 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 924
 925         switch (family) {
 926         case PF_INET:
 927                 return sctp_pf_inet_specific;
 928         case PF_INET6:
 929                 return sctp_pf_inet6_specific;
 930         default:
 931                 return NULL;
 932         }
 933 }
 934
 935 /* Register the PF specific function table.  */
 936 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 937 {
 938         switch (family) {
 939         case PF_INET:
 940                 if (sctp_pf_inet_specific)
 941                         return 0;
 942                 sctp_pf_inet_specific = pf;
 943                 break;
 944         case PF_INET6:
 945                 if (sctp_pf_inet6_specific)
 946                         return 0;
 947                 sctp_pf_inet6_specific = pf;
 948                 break;
 949         default:
 950                 return 0;
 951         }
 952         return 1;
 953 }
 954
 955 static int __init init_sctp_mibs(void)
 956 {
 957         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
 958         if (!sctp_statistics[0])
 959                 return -ENOMEM;
 960         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
 961         if (!sctp_statistics[1]) {
 962                 free_percpu(sctp_statistics[0]);
 963                 return -ENOMEM;
 964         }
 965         return 0;
 966
 967 }
 968
 969 static void cleanup_sctp_mibs(void)
 970 {
 971         free_percpu(sctp_statistics[0]);
 972         free_percpu(sctp_statistics[1]);
 973 }
 974
 975 /* Initialize the universe into something sensible.  */
 976 SCTP_STATIC __init int sctp_init(void)
 977 {
 978         int i;
 979         int status = -EINVAL;
 980         unsigned long goal;
 981         int order;
 982
 983         /* SCTP_DEBUG sanity check. */
 984         if (!sctp_sanity_check())
 985                 goto out;
 986
 987         status = proto_register(&sctp_prot, 1);
 988         if (status)
 989                 goto out;
 990
 991         /* Add SCTP to inet_protos hash table.  */
 992         status = -EAGAIN;
 993         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
 994                 goto err_add_protocol;
 995
 996         /* Add SCTP(TCP and UDP style) to inetsw linked list.  */
 997         inet_register_protosw(&sctp_seqpacket_protosw);
 998         inet_register_protosw(&sctp_stream_protosw);
 999
1000         /* Allocate a cache pools. */
1001         status = -ENOBUFS;
1002         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1003                                                sizeof(struct sctp_bind_bucket),
1004                                                0, SLAB_HWCACHE_ALIGN,
1005                                                NULL, NULL);
1006
1007         if (!sctp_bucket_cachep)
1008                 goto err_bucket_cachep;
1009
1010         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1011                                                sizeof(struct sctp_chunk),
1012                                                0, SLAB_HWCACHE_ALIGN,
1013                                                NULL, NULL);
1014         if (!sctp_chunk_cachep)
1015                 goto err_chunk_cachep;
1016
1017         /* Allocate and initialise sctp mibs.  */
1018         status = init_sctp_mibs();
1019         if (status)
1020                 goto err_init_mibs;
1021
1022         /* Initialize proc fs directory.  */
1023         status = sctp_proc_init();
1024         if (status)
1025                 goto err_init_proc;
1026
1027         /* Initialize object count debugging.  */
1028         sctp_dbg_objcnt_init();
1029
1030         /* Initialize the SCTP specific PF functions. */
1031         sctp_register_pf(&sctp_pf_inet, PF_INET);
1032         /*
1033          * 14. Suggested SCTP Protocol Parameter Values
1034          */
1035         /* The following protocol parameters are RECOMMENDED:  */
1036         /* RTO.Initial              - 3  seconds */
1037         sctp_rto_initial                = SCTP_RTO_INITIAL;
1038         /* RTO.Min                  - 1  second */
1039         sctp_rto_min                    = SCTP_RTO_MIN;
1040         /* RTO.Max                 -  60 seconds */
1041         sctp_rto_max                    = SCTP_RTO_MAX;
1042         /* RTO.Alpha                - 1/8 */
1043         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1044         /* RTO.Beta                 - 1/4 */
1045         sctp_rto_beta                   = SCTP_RTO_BETA;
1046
1047         /* Valid.Cookie.Life        - 60  seconds */
1048         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1049
1050         /* Whether Cookie Preservative is enabled(1) or not(0) */
1051         sctp_cookie_preserve_enable     = 1;
1052
1053         /* Max.Burst                - 4 */
1054         sctp_max_burst                  = SCTP_MAX_BURST;
1055
1056         /* Association.Max.Retrans  - 10 attempts
1057          * Path.Max.Retrans         - 5  attempts (per destination address)
1058          * Max.Init.Retransmits     - 8  attempts
1059          */
1060         sctp_max_retrans_association    = 10;
1061         sctp_max_retrans_path           = 5;
1062         sctp_max_retrans_init           = 8;
1063
1064         /* Sendbuffer growth        - do per-socket accounting */
1065         sctp_sndbuf_policy              = 0;
1066
1067         /* Rcvbuffer growth         - do per-socket accounting */
1068         sctp_rcvbuf_policy              = 0;
1069
1070         /* HB.interval              - 30 seconds */
1071         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1072
1073         /* delayed SACK timeout */
1074         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1075
1076         /* Implementation specific variables. */
1077
1078         /* Initialize default stream count setup information. */
1079         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1080         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1081
1082         /* Initialize handle used for association ids. */
1083         idr_init(&sctp_assocs_id);
1084
1085         /* Size and allocate the association hash table.
1086          * The methodology is similar to that of the tcp hash tables.
1087          */
1088         if (num_physpages >= (128 * 1024))
1089                 goal = num_physpages >> (22 - PAGE_SHIFT);
1090         else
1091                 goal = num_physpages >> (24 - PAGE_SHIFT);
1092
1093         for (order = 0; (1UL << order) < goal; order++)
1094                 ;
1095
1096         do {
1097                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1098                                         sizeof(struct sctp_hashbucket);
1099                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1100                         continue;
1101                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1102                                         __get_free_pages(GFP_ATOMIC, order);
1103         } while (!sctp_assoc_hashtable && --order > 0);
1104         if (!sctp_assoc_hashtable) {
1105                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1106                 status = -ENOMEM;
1107                 goto err_ahash_alloc;
1108         }
1109         for (i = 0; i < sctp_assoc_hashsize; i++) {
1110                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1111                 sctp_assoc_hashtable[i].chain = NULL;
1112         }
1113
1114         /* Allocate and initialize the endpoint hash table.  */
1115         sctp_ep_hashsize = 64;
1116         sctp_ep_hashtable = (struct sctp_hashbucket *)
1117                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1118         if (!sctp_ep_hashtable) {
1119                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1120                 status = -ENOMEM;
1121                 goto err_ehash_alloc;
1122         }
1123         for (i = 0; i < sctp_ep_hashsize; i++) {
1124                 rwlock_init(&sctp_ep_hashtable[i].lock);
1125                 sctp_ep_hashtable[i].chain = NULL;
1126         }
1127
1128         /* Allocate and initialize the SCTP port hash table.  */
1129         do {
1130                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1131                                         sizeof(struct sctp_bind_hashbucket);
1132                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1133                         continue;
1134                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1135                                         __get_free_pages(GFP_ATOMIC, order);
1136         } while (!sctp_port_hashtable && --order > 0);
1137         if (!sctp_port_hashtable) {
1138                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1139                 status = -ENOMEM;
1140                 goto err_bhash_alloc;
1141         }
1142         for (i = 0; i < sctp_port_hashsize; i++) {
1143                 spin_lock_init(&sctp_port_hashtable[i].lock);
1144                 sctp_port_hashtable[i].chain = NULL;
1145         }
1146
1147         spin_lock_init(&sctp_port_alloc_lock);
1148         sctp_port_rover = sysctl_local_port_range[0] - 1;
1149
1150         printk(KERN_INFO "SCTP: Hash tables configured "
1151                          "(established %d bind %d)\n",
1152                 sctp_assoc_hashsize, sctp_port_hashsize);
1153
1154         /* Disable ADDIP by default. */
1155         sctp_addip_enable = 0;
1156
1157         /* Enable PR-SCTP by default. */
1158         sctp_prsctp_enable = 1;
1159
1160         sctp_sysctl_register();
1161
1162         INIT_LIST_HEAD(&sctp_address_families);
1163         sctp_register_af(&sctp_ipv4_specific);
1164
1165         status = sctp_v6_init();
1166         if (status)
1167                 goto err_v6_init;
1168
1169         /* Initialize the control inode/socket for handling OOTB packets.  */
1170         if ((status = sctp_ctl_sock_init())) {
1171                 printk (KERN_ERR
1172                         "SCTP: Failed to initialize the SCTP control sock.\n");
1173                 goto err_ctl_sock_init;
1174         }
1175
1176         /* Initialize the local address list. */
1177         INIT_LIST_HEAD(&sctp_local_addr_list);
1178         spin_lock_init(&sctp_local_addr_lock);
1179
1180         /* Register notifier for inet address additions/deletions. */
1181         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1182
1183         sctp_get_local_addr_list();
1184
1185         __unsafe(THIS_MODULE);
1186         status = 0;
1187 out:
1188         return status;
1189 err_ctl_sock_init:
1190         sctp_v6_exit();
1191 err_v6_init:
1192         sctp_sysctl_unregister();
1193         list_del(&sctp_ipv4_specific.list);
1194         free_pages((unsigned long)sctp_port_hashtable,
1195                    get_order(sctp_port_hashsize *
1196                              sizeof(struct sctp_bind_hashbucket)));
1197 err_bhash_alloc:
1198         kfree(sctp_ep_hashtable);
1199 err_ehash_alloc:
1200         free_pages((unsigned long)sctp_assoc_hashtable,
1201                    get_order(sctp_assoc_hashsize *
1202                              sizeof(struct sctp_hashbucket)));
1203 err_ahash_alloc:
1204         sctp_dbg_objcnt_exit();
1205 err_init_proc:
1206         sctp_proc_exit();
1207         cleanup_sctp_mibs();
1208 err_init_mibs:
1209         kmem_cache_destroy(sctp_chunk_cachep);
1210 err_chunk_cachep:
1211         kmem_cache_destroy(sctp_bucket_cachep);
1212 err_bucket_cachep:
1213         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1214         inet_unregister_protosw(&sctp_seqpacket_protosw);
1215         inet_unregister_protosw(&sctp_stream_protosw);
1216 err_add_protocol:
1217         proto_unregister(&sctp_prot);
1218         goto out;
1219 }
1220
1221 /* Exit handler for the SCTP protocol.  */
1222 SCTP_STATIC __exit void sctp_exit(void)
1223 {
1224         /* BUG.  This should probably do something useful like clean
1225          * up all the remaining associations and all that memory.
1226          */
1227
1228         /* Unregister notifier for inet address additions/deletions. */
1229         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1230
1231         /* Free the local address list.  */
1232         sctp_free_local_addr_list();
1233
1234         /* Free the control endpoint.  */
1235         sock_release(sctp_ctl_socket);
1236
1237         sctp_v6_exit();
1238         sctp_sysctl_unregister();
1239         list_del(&sctp_ipv4_specific.list);
1240
1241         free_pages((unsigned long)sctp_assoc_hashtable,
1242                    get_order(sctp_assoc_hashsize *
1243                              sizeof(struct sctp_hashbucket)));
1244         kfree(sctp_ep_hashtable);
1245         free_pages((unsigned long)sctp_port_hashtable,
1246                    get_order(sctp_port_hashsize *
1247                              sizeof(struct sctp_bind_hashbucket)));
1248
1249         kmem_cache_destroy(sctp_chunk_cachep);
1250         kmem_cache_destroy(sctp_bucket_cachep);
1251
1252         sctp_dbg_objcnt_exit();
1253         sctp_proc_exit();
1254         cleanup_sctp_mibs();
1255
1256         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1257         inet_unregister_protosw(&sctp_seqpacket_protosw);
1258         inet_unregister_protosw(&sctp_stream_protosw);
1259         proto_unregister(&sctp_prot);
1260 }
1261
1262 module_init(sctp_init);
1263 module_exit(sctp_exit);
1264
1265 /*
1266  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1267  */
1268 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1269 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1270 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1271 MODULE_LICENSE("GPL");