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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 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, 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         __be16 *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  = sh->source;
 264                 from = &skb->nh.iph->saddr;
 265         } else {
 266                 *port = 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                                     __be16 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                               __be16 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                         laddr = list_entry(pos, struct sctp_sockaddr_entry,
 482                                            list);
 483                         if (!laddr->use_as_src)
 484                                 continue;
 485                         sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 486                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 487                                 goto out_unlock;
 488                 }
 489                 sctp_read_unlock(addr_lock);
 490
 491                 /* None of the bound addresses match the source address of the
 492                  * dst. So release it.
 493                  */
 494                 dst_release(dst);
 495                 dst = NULL;
 496         }
 497
 498         /* Walk through the bind address list and try to get a dst that
 499          * matches a bind address as the source address.
 500          */
 501         sctp_read_lock(addr_lock);
 502         list_for_each(pos, &bp->address_list) {
 503                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
 504
 505                 if ((laddr->use_as_src) &&
 506                     (AF_INET == laddr->a_h.sa.sa_family)) {
 507                         fl.fl4_src = laddr->a_h.v4.sin_addr.s_addr;
 508                         if (!ip_route_output_key(&rt, &fl)) {
 509                                 dst = &rt->u.dst;
 510                                 goto out_unlock;
 511                         }
 512                 }
 513         }
 514
 515 out_unlock:
 516         sctp_read_unlock(addr_lock);
 517 out:
 518         if (dst)
 519                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
 520                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
 521         else
 522                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 523
 524         return dst;
 525 }
 526
 527 /* For v4, the source address is cached in the route entry(dst). So no need
 528  * to cache it separately and hence this is an empty routine.
 529  */
 530 static void sctp_v4_get_saddr(struct sctp_association *asoc,
 531                               struct dst_entry *dst,
 532                               union sctp_addr *daddr,
 533                               union sctp_addr *saddr)
 534 {
 535         struct rtable *rt = (struct rtable *)dst;
 536
 537         if (!asoc)
 538                 return;
 539
 540         if (rt) {
 541                 saddr->v4.sin_family = AF_INET;
 542                 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 543                 saddr->v4.sin_addr.s_addr = rt->rt_src;
 544         }
 545 }
 546
 547 /* What interface did this skb arrive on? */
 548 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 549 {
 550         return ((struct rtable *)skb->dst)->rt_iif;
 551 }
 552
 553 /* Was this packet marked by Explicit Congestion Notification? */
 554 static int sctp_v4_is_ce(const struct sk_buff *skb)
 555 {
 556         return INET_ECN_is_ce(skb->nh.iph->tos);
 557 }
 558
 559 /* Create and initialize a new sk for the socket returned by accept(). */
 560 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 561                                              struct sctp_association *asoc)
 562 {
 563         struct inet_sock *inet = inet_sk(sk);
 564         struct inet_sock *newinet;
 565         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
 566
 567         if (!newsk)
 568                 goto out;
 569
 570         sock_init_data(NULL, newsk);
 571
 572         newsk->sk_type = SOCK_STREAM;
 573
 574         newsk->sk_no_check = sk->sk_no_check;
 575         newsk->sk_reuse = sk->sk_reuse;
 576         newsk->sk_shutdown = sk->sk_shutdown;
 577
 578         newsk->sk_destruct = inet_sock_destruct;
 579         newsk->sk_family = PF_INET;
 580         newsk->sk_protocol = IPPROTO_SCTP;
 581         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 582         sock_reset_flag(newsk, SOCK_ZAPPED);
 583
 584         newinet = inet_sk(newsk);
 585
 586         /* Initialize sk's sport, dport, rcv_saddr and daddr for
 587          * getsockname() and getpeername()
 588          */
 589         newinet->sport = inet->sport;
 590         newinet->saddr = inet->saddr;
 591         newinet->rcv_saddr = inet->rcv_saddr;
 592         newinet->dport = htons(asoc->peer.port);
 593         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 594         newinet->pmtudisc = inet->pmtudisc;
 595         newinet->id = asoc->next_tsn ^ jiffies;
 596
 597         newinet->uc_ttl = -1;
 598         newinet->mc_loop = 1;
 599         newinet->mc_ttl = 1;
 600         newinet->mc_index = 0;
 601         newinet->mc_list = NULL;
 602
 603         sk_refcnt_debug_inc(newsk);
 604
 605         if (newsk->sk_prot->init(newsk)) {
 606                 sk_common_release(newsk);
 607                 newsk = NULL;
 608         }
 609
 610 out:
 611         return newsk;
 612 }
 613
 614 /* Map address, empty for v4 family */
 615 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 616 {
 617         /* Empty */
 618 }
 619
 620 /* Dump the v4 addr to the seq file. */
 621 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 622 {
 623         seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
 624 }
 625
 626 /* Event handler for inet address addition/deletion events.
 627  * Basically, whenever there is an event, we re-build our local address list.
 628  */
 629 int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 630                         void *ptr)
 631 {
 632         unsigned long flags;
 633
 634         sctp_spin_lock_irqsave(&sctp_local_addr_lock, flags);
 635         __sctp_free_local_addr_list();
 636         __sctp_get_local_addr_list();
 637         sctp_spin_unlock_irqrestore(&sctp_local_addr_lock, flags);
 638
 639         return NOTIFY_DONE;
 640 }
 641
 642 /*
 643  * Initialize the control inode/socket with a control endpoint data
 644  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 645  */
 646 static int sctp_ctl_sock_init(void)
 647 {
 648         int err;
 649         sa_family_t family;
 650
 651         if (sctp_get_pf_specific(PF_INET6))
 652                 family = PF_INET6;
 653         else
 654                 family = PF_INET;
 655
 656         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
 657                                &sctp_ctl_socket);
 658         if (err < 0) {
 659                 printk(KERN_ERR
 660                        "SCTP: Failed to create the SCTP control socket.\n");
 661                 return err;
 662         }
 663         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
 664         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
 665
 666         return 0;
 667 }
 668
 669 /* Register address family specific functions. */
 670 int sctp_register_af(struct sctp_af *af)
 671 {
 672         switch (af->sa_family) {
 673         case AF_INET:
 674                 if (sctp_af_v4_specific)
 675                         return 0;
 676                 sctp_af_v4_specific = af;
 677                 break;
 678         case AF_INET6:
 679                 if (sctp_af_v6_specific)
 680                         return 0;
 681                 sctp_af_v6_specific = af;
 682                 break;
 683         default:
 684                 return 0;
 685         }
 686
 687         INIT_LIST_HEAD(&af->list);
 688         list_add_tail(&af->list, &sctp_address_families);
 689         return 1;
 690 }
 691
 692 /* Get the table of functions for manipulating a particular address
 693  * family.
 694  */
 695 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 696 {
 697         switch (family) {
 698         case AF_INET:
 699                 return sctp_af_v4_specific;
 700         case AF_INET6:
 701                 return sctp_af_v6_specific;
 702         default:
 703                 return NULL;
 704         }
 705 }
 706
 707 /* Common code to initialize a AF_INET msg_name. */
 708 static void sctp_inet_msgname(char *msgname, int *addr_len)
 709 {
 710         struct sockaddr_in *sin;
 711
 712         sin = (struct sockaddr_in *)msgname;
 713         *addr_len = sizeof(struct sockaddr_in);
 714         sin->sin_family = AF_INET;
 715         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 716 }
 717
 718 /* Copy the primary address of the peer primary address as the msg_name. */
 719 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 720                                     int *addr_len)
 721 {
 722         struct sockaddr_in *sin, *sinfrom;
 723
 724         if (msgname) {
 725                 struct sctp_association *asoc;
 726
 727                 asoc = event->asoc;
 728                 sctp_inet_msgname(msgname, addr_len);
 729                 sin = (struct sockaddr_in *)msgname;
 730                 sinfrom = &asoc->peer.primary_addr.v4;
 731                 sin->sin_port = htons(asoc->peer.port);
 732                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 733         }
 734 }
 735
 736 /* Initialize and copy out a msgname from an inbound skb. */
 737 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 738 {
 739         struct sctphdr *sh;
 740         struct sockaddr_in *sin;
 741
 742         if (msgname) {
 743                 sctp_inet_msgname(msgname, len);
 744                 sin = (struct sockaddr_in *)msgname;
 745                 sh = (struct sctphdr *)skb->h.raw;
 746                 sin->sin_port = sh->source;
 747                 sin->sin_addr.s_addr = skb->nh.iph->saddr;
 748         }
 749 }
 750
 751 /* Do we support this AF? */
 752 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 753 {
 754         /* PF_INET only supports AF_INET addresses. */
 755         return (AF_INET == family);
 756 }
 757
 758 /* Address matching with wildcards allowed. */
 759 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 760                               const union sctp_addr *addr2,
 761                               struct sctp_sock *opt)
 762 {
 763         /* PF_INET only supports AF_INET addresses. */
 764         if (addr1->sa.sa_family != addr2->sa.sa_family)
 765                 return 0;
 766         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
 767             INADDR_ANY == addr2->v4.sin_addr.s_addr)
 768                 return 1;
 769         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 770                 return 1;
 771
 772         return 0;
 773 }
 774
 775 /* Verify that provided sockaddr looks bindable.  Common verification has
 776  * already been taken care of.
 777  */
 778 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 779 {
 780         return sctp_v4_available(addr, opt);
 781 }
 782
 783 /* Verify that sockaddr looks sendable.  Common verification has already
 784  * been taken care of.
 785  */
 786 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 787 {
 788         return 1;
 789 }
 790
 791 /* Fill in Supported Address Type information for INIT and INIT-ACK
 792  * chunks.  Returns number of addresses supported.
 793  */
 794 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 795                                      __u16 *types)
 796 {
 797         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 798         return 1;
 799 }
 800
 801 /* Wrapper routine that calls the ip transmit routine. */
 802 static inline int sctp_v4_xmit(struct sk_buff *skb,
 803                                struct sctp_transport *transport, int ipfragok)
 804 {
 805         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 806                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
 807                           __FUNCTION__, skb, skb->len,
 808                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
 809                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 810
 811         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 812         return ip_queue_xmit(skb, skb->sk, ipfragok);
 813 }
 814
 815 static struct sctp_af sctp_ipv4_specific;
 816
 817 static struct sctp_pf sctp_pf_inet = {
 818         .event_msgname = sctp_inet_event_msgname,
 819         .skb_msgname   = sctp_inet_skb_msgname,
 820         .af_supported  = sctp_inet_af_supported,
 821         .cmp_addr      = sctp_inet_cmp_addr,
 822         .bind_verify   = sctp_inet_bind_verify,
 823         .send_verify   = sctp_inet_send_verify,
 824         .supported_addrs = sctp_inet_supported_addrs,
 825         .create_accept_sk = sctp_v4_create_accept_sk,
 826         .addr_v4map     = sctp_v4_addr_v4map,
 827         .af            = &sctp_ipv4_specific,
 828 };
 829
 830 /* Notifier for inetaddr addition/deletion events.  */
 831 static struct notifier_block sctp_inetaddr_notifier = {
 832         .notifier_call = sctp_inetaddr_event,
 833 };
 834
 835 /* Socket operations.  */
 836 static const struct proto_ops inet_seqpacket_ops = {
 837         .family            = PF_INET,
 838         .owner             = THIS_MODULE,
 839         .release           = inet_release,      /* Needs to be wrapped... */
 840         .bind              = inet_bind,
 841         .connect           = inet_dgram_connect,
 842         .socketpair        = sock_no_socketpair,
 843         .accept            = inet_accept,
 844         .getname           = inet_getname,      /* Semantics are different.  */
 845         .poll              = sctp_poll,
 846         .ioctl             = inet_ioctl,
 847         .listen            = sctp_inet_listen,
 848         .shutdown          = inet_shutdown,     /* Looks harmless.  */
 849         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 850         .getsockopt        = sock_common_getsockopt,
 851         .sendmsg           = inet_sendmsg,
 852         .recvmsg           = sock_common_recvmsg,
 853         .mmap              = sock_no_mmap,
 854         .sendpage          = sock_no_sendpage,
 855 #ifdef CONFIG_COMPAT
 856         .compat_setsockopt = compat_sock_common_setsockopt,
 857         .compat_getsockopt = compat_sock_common_getsockopt,
 858 #endif
 859 };
 860
 861 /* Registration with AF_INET family.  */
 862 static struct inet_protosw sctp_seqpacket_protosw = {
 863         .type       = SOCK_SEQPACKET,
 864         .protocol   = IPPROTO_SCTP,
 865         .prot       = &sctp_prot,
 866         .ops        = &inet_seqpacket_ops,
 867         .capability = -1,
 868         .no_check   = 0,
 869         .flags      = SCTP_PROTOSW_FLAG
 870 };
 871 static struct inet_protosw sctp_stream_protosw = {
 872         .type       = SOCK_STREAM,
 873         .protocol   = IPPROTO_SCTP,
 874         .prot       = &sctp_prot,
 875         .ops        = &inet_seqpacket_ops,
 876         .capability = -1,
 877         .no_check   = 0,
 878         .flags      = SCTP_PROTOSW_FLAG
 879 };
 880
 881 /* Register with IP layer.  */
 882 static struct net_protocol sctp_protocol = {
 883         .handler     = sctp_rcv,
 884         .err_handler = sctp_v4_err,
 885         .no_policy   = 1,
 886 };
 887
 888 /* IPv4 address related functions.  */
 889 static struct sctp_af sctp_ipv4_specific = {
 890         .sa_family         = AF_INET,
 891         .sctp_xmit         = sctp_v4_xmit,
 892         .setsockopt        = ip_setsockopt,
 893         .getsockopt        = ip_getsockopt,
 894         .get_dst           = sctp_v4_get_dst,
 895         .get_saddr         = sctp_v4_get_saddr,
 896         .copy_addrlist     = sctp_v4_copy_addrlist,
 897         .from_skb          = sctp_v4_from_skb,
 898         .from_sk           = sctp_v4_from_sk,
 899         .to_sk_saddr       = sctp_v4_to_sk_saddr,
 900         .to_sk_daddr       = sctp_v4_to_sk_daddr,
 901         .from_addr_param   = sctp_v4_from_addr_param,
 902         .to_addr_param     = sctp_v4_to_addr_param,
 903         .dst_saddr         = sctp_v4_dst_saddr,
 904         .cmp_addr          = sctp_v4_cmp_addr,
 905         .addr_valid        = sctp_v4_addr_valid,
 906         .inaddr_any        = sctp_v4_inaddr_any,
 907         .is_any            = sctp_v4_is_any,
 908         .available         = sctp_v4_available,
 909         .scope             = sctp_v4_scope,
 910         .skb_iif           = sctp_v4_skb_iif,
 911         .is_ce             = sctp_v4_is_ce,
 912         .seq_dump_addr     = sctp_v4_seq_dump_addr,
 913         .net_header_len    = sizeof(struct iphdr),
 914         .sockaddr_len      = sizeof(struct sockaddr_in),
 915 #ifdef CONFIG_COMPAT
 916         .compat_setsockopt = compat_ip_setsockopt,
 917         .compat_getsockopt = compat_ip_getsockopt,
 918 #endif
 919 };
 920
 921 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 922
 923         switch (family) {
 924         case PF_INET:
 925                 return sctp_pf_inet_specific;
 926         case PF_INET6:
 927                 return sctp_pf_inet6_specific;
 928         default:
 929                 return NULL;
 930         }
 931 }
 932
 933 /* Register the PF specific function table.  */
 934 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 935 {
 936         switch (family) {
 937         case PF_INET:
 938                 if (sctp_pf_inet_specific)
 939                         return 0;
 940                 sctp_pf_inet_specific = pf;
 941                 break;
 942         case PF_INET6:
 943                 if (sctp_pf_inet6_specific)
 944                         return 0;
 945                 sctp_pf_inet6_specific = pf;
 946                 break;
 947         default:
 948                 return 0;
 949         }
 950         return 1;
 951 }
 952
 953 static int __init init_sctp_mibs(void)
 954 {
 955         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
 956         if (!sctp_statistics[0])
 957                 return -ENOMEM;
 958         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
 959         if (!sctp_statistics[1]) {
 960                 free_percpu(sctp_statistics[0]);
 961                 return -ENOMEM;
 962         }
 963         return 0;
 964
 965 }
 966
 967 static void cleanup_sctp_mibs(void)
 968 {
 969         free_percpu(sctp_statistics[0]);
 970         free_percpu(sctp_statistics[1]);
 971 }
 972
 973 /* Initialize the universe into something sensible.  */
 974 SCTP_STATIC __init int sctp_init(void)
 975 {
 976         int i;
 977         int status = -EINVAL;
 978         unsigned long goal;
 979         int order;
 980
 981         /* SCTP_DEBUG sanity check. */
 982         if (!sctp_sanity_check())
 983                 goto out;
 984
 985         status = proto_register(&sctp_prot, 1);
 986         if (status)
 987                 goto out;
 988
 989         /* Add SCTP to inet_protos hash table.  */
 990         status = -EAGAIN;
 991         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
 992                 goto err_add_protocol;
 993
 994         /* Add SCTP(TCP and UDP style) to inetsw linked list.  */
 995         inet_register_protosw(&sctp_seqpacket_protosw);
 996         inet_register_protosw(&sctp_stream_protosw);
 997
 998         /* Allocate a cache pools. */
 999         status = -ENOBUFS;
1000         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1001                                                sizeof(struct sctp_bind_bucket),
1002                                                0, SLAB_HWCACHE_ALIGN,
1003                                                NULL, NULL);
1004
1005         if (!sctp_bucket_cachep)
1006                 goto err_bucket_cachep;
1007
1008         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1009                                                sizeof(struct sctp_chunk),
1010                                                0, SLAB_HWCACHE_ALIGN,
1011                                                NULL, NULL);
1012         if (!sctp_chunk_cachep)
1013                 goto err_chunk_cachep;
1014
1015         /* Allocate and initialise sctp mibs.  */
1016         status = init_sctp_mibs();
1017         if (status)
1018                 goto err_init_mibs;
1019
1020         /* Initialize proc fs directory.  */
1021         status = sctp_proc_init();
1022         if (status)
1023                 goto err_init_proc;
1024
1025         /* Initialize object count debugging.  */
1026         sctp_dbg_objcnt_init();
1027
1028         /* Initialize the SCTP specific PF functions. */
1029         sctp_register_pf(&sctp_pf_inet, PF_INET);
1030         /*
1031          * 14. Suggested SCTP Protocol Parameter Values
1032          */
1033         /* The following protocol parameters are RECOMMENDED:  */
1034         /* RTO.Initial              - 3  seconds */
1035         sctp_rto_initial                = SCTP_RTO_INITIAL;
1036         /* RTO.Min                  - 1  second */
1037         sctp_rto_min                    = SCTP_RTO_MIN;
1038         /* RTO.Max                 -  60 seconds */
1039         sctp_rto_max                    = SCTP_RTO_MAX;
1040         /* RTO.Alpha                - 1/8 */
1041         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1042         /* RTO.Beta                 - 1/4 */
1043         sctp_rto_beta                   = SCTP_RTO_BETA;
1044
1045         /* Valid.Cookie.Life        - 60  seconds */
1046         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1047
1048         /* Whether Cookie Preservative is enabled(1) or not(0) */
1049         sctp_cookie_preserve_enable     = 1;
1050
1051         /* Max.Burst                - 4 */
1052         sctp_max_burst                  = SCTP_MAX_BURST;
1053
1054         /* Association.Max.Retrans  - 10 attempts
1055          * Path.Max.Retrans         - 5  attempts (per destination address)
1056          * Max.Init.Retransmits     - 8  attempts
1057          */
1058         sctp_max_retrans_association    = 10;
1059         sctp_max_retrans_path           = 5;
1060         sctp_max_retrans_init           = 8;
1061
1062         /* Sendbuffer growth        - do per-socket accounting */
1063         sctp_sndbuf_policy              = 0;
1064
1065         /* Rcvbuffer growth         - do per-socket accounting */
1066         sctp_rcvbuf_policy              = 0;
1067
1068         /* HB.interval              - 30 seconds */
1069         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1070
1071         /* delayed SACK timeout */
1072         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1073
1074         /* Implementation specific variables. */
1075
1076         /* Initialize default stream count setup information. */
1077         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1078         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1079
1080         /* Initialize handle used for association ids. */
1081         idr_init(&sctp_assocs_id);
1082
1083         /* Size and allocate the association hash table.
1084          * The methodology is similar to that of the tcp hash tables.
1085          */
1086         if (num_physpages >= (128 * 1024))
1087                 goal = num_physpages >> (22 - PAGE_SHIFT);
1088         else
1089                 goal = num_physpages >> (24 - PAGE_SHIFT);
1090
1091         for (order = 0; (1UL << order) < goal; order++)
1092                 ;
1093
1094         do {
1095                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1096                                         sizeof(struct sctp_hashbucket);
1097                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1098                         continue;
1099                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1100                                         __get_free_pages(GFP_ATOMIC, order);
1101         } while (!sctp_assoc_hashtable && --order > 0);
1102         if (!sctp_assoc_hashtable) {
1103                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1104                 status = -ENOMEM;
1105                 goto err_ahash_alloc;
1106         }
1107         for (i = 0; i < sctp_assoc_hashsize; i++) {
1108                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1109                 sctp_assoc_hashtable[i].chain = NULL;
1110         }
1111
1112         /* Allocate and initialize the endpoint hash table.  */
1113         sctp_ep_hashsize = 64;
1114         sctp_ep_hashtable = (struct sctp_hashbucket *)
1115                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1116         if (!sctp_ep_hashtable) {
1117                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1118                 status = -ENOMEM;
1119                 goto err_ehash_alloc;
1120         }
1121         for (i = 0; i < sctp_ep_hashsize; i++) {
1122                 rwlock_init(&sctp_ep_hashtable[i].lock);
1123                 sctp_ep_hashtable[i].chain = NULL;
1124         }
1125
1126         /* Allocate and initialize the SCTP port hash table.  */
1127         do {
1128                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1129                                         sizeof(struct sctp_bind_hashbucket);
1130                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1131                         continue;
1132                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1133                                         __get_free_pages(GFP_ATOMIC, order);
1134         } while (!sctp_port_hashtable && --order > 0);
1135         if (!sctp_port_hashtable) {
1136                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1137                 status = -ENOMEM;
1138                 goto err_bhash_alloc;
1139         }
1140         for (i = 0; i < sctp_port_hashsize; i++) {
1141                 spin_lock_init(&sctp_port_hashtable[i].lock);
1142                 sctp_port_hashtable[i].chain = NULL;
1143         }
1144
1145         spin_lock_init(&sctp_port_alloc_lock);
1146         sctp_port_rover = sysctl_local_port_range[0] - 1;
1147
1148         printk(KERN_INFO "SCTP: Hash tables configured "
1149                          "(established %d bind %d)\n",
1150                 sctp_assoc_hashsize, sctp_port_hashsize);
1151
1152         /* Disable ADDIP by default. */
1153         sctp_addip_enable = 0;
1154
1155         /* Enable PR-SCTP by default. */
1156         sctp_prsctp_enable = 1;
1157
1158         sctp_sysctl_register();
1159
1160         INIT_LIST_HEAD(&sctp_address_families);
1161         sctp_register_af(&sctp_ipv4_specific);
1162
1163         status = sctp_v6_init();
1164         if (status)
1165                 goto err_v6_init;
1166
1167         /* Initialize the control inode/socket for handling OOTB packets.  */
1168         if ((status = sctp_ctl_sock_init())) {
1169                 printk (KERN_ERR
1170                         "SCTP: Failed to initialize the SCTP control sock.\n");
1171                 goto err_ctl_sock_init;
1172         }
1173
1174         /* Initialize the local address list. */
1175         INIT_LIST_HEAD(&sctp_local_addr_list);
1176         spin_lock_init(&sctp_local_addr_lock);
1177
1178         /* Register notifier for inet address additions/deletions. */
1179         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1180
1181         sctp_get_local_addr_list();
1182
1183         __unsafe(THIS_MODULE);
1184         status = 0;
1185 out:
1186         return status;
1187 err_ctl_sock_init:
1188         sctp_v6_exit();
1189 err_v6_init:
1190         sctp_sysctl_unregister();
1191         list_del(&sctp_ipv4_specific.list);
1192         free_pages((unsigned long)sctp_port_hashtable,
1193                    get_order(sctp_port_hashsize *
1194                              sizeof(struct sctp_bind_hashbucket)));
1195 err_bhash_alloc:
1196         kfree(sctp_ep_hashtable);
1197 err_ehash_alloc:
1198         free_pages((unsigned long)sctp_assoc_hashtable,
1199                    get_order(sctp_assoc_hashsize *
1200                              sizeof(struct sctp_hashbucket)));
1201 err_ahash_alloc:
1202         sctp_dbg_objcnt_exit();
1203 err_init_proc:
1204         sctp_proc_exit();
1205         cleanup_sctp_mibs();
1206 err_init_mibs:
1207         kmem_cache_destroy(sctp_chunk_cachep);
1208 err_chunk_cachep:
1209         kmem_cache_destroy(sctp_bucket_cachep);
1210 err_bucket_cachep:
1211         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1212         inet_unregister_protosw(&sctp_seqpacket_protosw);
1213         inet_unregister_protosw(&sctp_stream_protosw);
1214 err_add_protocol:
1215         proto_unregister(&sctp_prot);
1216         goto out;
1217 }
1218
1219 /* Exit handler for the SCTP protocol.  */
1220 SCTP_STATIC __exit void sctp_exit(void)
1221 {
1222         /* BUG.  This should probably do something useful like clean
1223          * up all the remaining associations and all that memory.
1224          */
1225
1226         /* Unregister notifier for inet address additions/deletions. */
1227         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1228
1229         /* Free the local address list.  */
1230         sctp_free_local_addr_list();
1231
1232         /* Free the control endpoint.  */
1233         sock_release(sctp_ctl_socket);
1234
1235         sctp_v6_exit();
1236         sctp_sysctl_unregister();
1237         list_del(&sctp_ipv4_specific.list);
1238
1239         free_pages((unsigned long)sctp_assoc_hashtable,
1240                    get_order(sctp_assoc_hashsize *
1241                              sizeof(struct sctp_hashbucket)));
1242         kfree(sctp_ep_hashtable);
1243         free_pages((unsigned long)sctp_port_hashtable,
1244                    get_order(sctp_port_hashsize *
1245                              sizeof(struct sctp_bind_hashbucket)));
1246
1247         kmem_cache_destroy(sctp_chunk_cachep);
1248         kmem_cache_destroy(sctp_bucket_cachep);
1249
1250         sctp_dbg_objcnt_exit();
1251         sctp_proc_exit();
1252         cleanup_sctp_mibs();
1253
1254         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1255         inet_unregister_protosw(&sctp_seqpacket_protosw);
1256         inet_unregister_protosw(&sctp_stream_protosw);
1257         proto_unregister(&sctp_prot);
1258 }
1259
1260 module_init(sctp_init);
1261 module_exit(sctp_exit);
1262
1263 /*
1264  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1265  */
1266 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1267 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1268 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1269 MODULE_LICENSE("GPL");