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 struct kmem_cache *sctp_chunk_cachep __read_mostly;
  83 struct kmem_cache *sctp_bucket_cachep __read_mostly;
  84
  85 /* Return the address of the control sock. */
  86 struct sock *sctp_get_ctl_sock(void)
  87 {
  88         return sctp_ctl_socket->sk;
  89 }
  90
  91 /* Set up the proc fs entry for the SCTP protocol. */
  92 static __init int sctp_proc_init(void)
  93 {
  94         if (!proc_net_sctp) {
  95                 struct proc_dir_entry *ent;
  96                 ent = proc_mkdir("net/sctp", NULL);
  97                 if (ent) {
  98                         ent->owner = THIS_MODULE;
  99                         proc_net_sctp = ent;
 100                 } else
 101                         goto out_nomem;
 102         }
 103
 104         if (sctp_snmp_proc_init())
 105                 goto out_nomem;
 106         if (sctp_eps_proc_init())
 107                 goto out_nomem;
 108         if (sctp_assocs_proc_init())
 109                 goto out_nomem;
 110
 111         return 0;
 112
 113 out_nomem:
 114         return -ENOMEM;
 115 }
 116
 117 /* Clean up the proc fs entry for the SCTP protocol.
 118  * Note: Do not make this __exit as it is used in the init error
 119  * path.
 120  */
 121 static void sctp_proc_exit(void)
 122 {
 123         sctp_snmp_proc_exit();
 124         sctp_eps_proc_exit();
 125         sctp_assocs_proc_exit();
 126
 127         if (proc_net_sctp) {
 128                 proc_net_sctp = NULL;
 129                 remove_proc_entry("net/sctp", NULL);
 130         }
 131 }
 132
 133 /* Private helper to extract ipv4 address and stash them in
 134  * the protocol structure.
 135  */
 136 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 137                                   struct net_device *dev)
 138 {
 139         struct in_device *in_dev;
 140         struct in_ifaddr *ifa;
 141         struct sctp_sockaddr_entry *addr;
 142
 143         rcu_read_lock();
 144         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 145                 rcu_read_unlock();
 146                 return;
 147         }
 148
 149         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 150                 /* Add the address to the local list.  */
 151                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 152                 if (addr) {
 153                         addr->a.v4.sin_family = AF_INET;
 154                         addr->a.v4.sin_port = 0;
 155                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 156                         addr->valid = 1;
 157                         INIT_LIST_HEAD(&addr->list);
 158                         INIT_RCU_HEAD(&addr->rcu);
 159                         list_add_tail(&addr->list, addrlist);
 160                 }
 161         }
 162
 163         rcu_read_unlock();
 164 }
 165
 166 /* Extract our IP addresses from the system and stash them in the
 167  * protocol structure.
 168  */
 169 static void sctp_get_local_addr_list(void)
 170 {
 171         struct net_device *dev;
 172         struct list_head *pos;
 173         struct sctp_af *af;
 174
 175         read_lock(&dev_base_lock);
 176         for_each_netdev(dev) {
 177                 __list_for_each(pos, &sctp_address_families) {
 178                         af = list_entry(pos, struct sctp_af, list);
 179                         af->copy_addrlist(&sctp_local_addr_list, dev);
 180                 }
 181         }
 182         read_unlock(&dev_base_lock);
 183 }
 184
 185 /* Free the existing local addresses.  */
 186 static void sctp_free_local_addr_list(void)
 187 {
 188         struct sctp_sockaddr_entry *addr;
 189         struct list_head *pos, *temp;
 190
 191         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 192                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 193                 list_del(pos);
 194                 kfree(addr);
 195         }
 196 }
 197
 198 void sctp_local_addr_free(struct rcu_head *head)
 199 {
 200         struct sctp_sockaddr_entry *e = container_of(head,
 201                                 struct sctp_sockaddr_entry, rcu);
 202         kfree(e);
 203 }
 204
 205 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 206 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 207                               gfp_t gfp, int copy_flags)
 208 {
 209         struct sctp_sockaddr_entry *addr;
 210         int error = 0;
 211
 212         rcu_read_lock();
 213         list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
 214                 if (!addr->valid)
 215                         continue;
 216                 if (sctp_in_scope(&addr->a, scope)) {
 217                         /* Now that the address is in scope, check to see if
 218                          * the address type is really supported by the local
 219                          * sock as well as the remote peer.
 220                          */
 221                         if ((((AF_INET == addr->a.sa.sa_family) &&
 222                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 223                             (((AF_INET6 == addr->a.sa.sa_family) &&
 224                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
 225                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 226                                 error = sctp_add_bind_addr(bp, &addr->a, 1,
 227                                                     GFP_ATOMIC);
 228                                 if (error)
 229                                         goto end_copy;
 230                         }
 231                 }
 232         }
 233
 234 end_copy:
 235         rcu_read_unlock();
 236         return error;
 237 }
 238
 239 /* Initialize a sctp_addr from in incoming skb.  */
 240 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 241                              int is_saddr)
 242 {
 243         void *from;
 244         __be16 *port;
 245         struct sctphdr *sh;
 246
 247         port = &addr->v4.sin_port;
 248         addr->v4.sin_family = AF_INET;
 249
 250         sh = sctp_hdr(skb);
 251         if (is_saddr) {
 252                 *port  = sh->source;
 253                 from = &ip_hdr(skb)->saddr;
 254         } else {
 255                 *port = sh->dest;
 256                 from = &ip_hdr(skb)->daddr;
 257         }
 258         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 259 }
 260
 261 /* Initialize an sctp_addr from a socket. */
 262 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 263 {
 264         addr->v4.sin_family = AF_INET;
 265         addr->v4.sin_port = 0;
 266         addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
 267 }
 268
 269 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
 270 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 271 {
 272         inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
 273 }
 274
 275 /* Initialize sk->sk_daddr from sctp_addr. */
 276 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 277 {
 278         inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
 279 }
 280
 281 /* Initialize a sctp_addr from an address parameter. */
 282 static void sctp_v4_from_addr_param(union sctp_addr *addr,
 283                                     union sctp_addr_param *param,
 284                                     __be16 port, int iif)
 285 {
 286         addr->v4.sin_family = AF_INET;
 287         addr->v4.sin_port = port;
 288         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 289 }
 290
 291 /* Initialize an address parameter from a sctp_addr and return the length
 292  * of the address parameter.
 293  */
 294 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 295                                  union sctp_addr_param *param)
 296 {
 297         int length = sizeof(sctp_ipv4addr_param_t);
 298
 299         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 300         param->v4.param_hdr.length = htons(length);
 301         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 302
 303         return length;
 304 }
 305
 306 /* Initialize a sctp_addr from a dst_entry. */
 307 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
 308                               __be16 port)
 309 {
 310         struct rtable *rt = (struct rtable *)dst;
 311         saddr->v4.sin_family = AF_INET;
 312         saddr->v4.sin_port = port;
 313         saddr->v4.sin_addr.s_addr = rt->rt_src;
 314 }
 315
 316 /* Compare two addresses exactly. */
 317 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 318                             const union sctp_addr *addr2)
 319 {
 320         if (addr1->sa.sa_family != addr2->sa.sa_family)
 321                 return 0;
 322         if (addr1->v4.sin_port != addr2->v4.sin_port)
 323                 return 0;
 324         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 325                 return 0;
 326
 327         return 1;
 328 }
 329
 330 /* Initialize addr struct to INADDR_ANY. */
 331 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 332 {
 333         addr->v4.sin_family = AF_INET;
 334         addr->v4.sin_addr.s_addr = INADDR_ANY;
 335         addr->v4.sin_port = port;
 336 }
 337
 338 /* Is this a wildcard address? */
 339 static int sctp_v4_is_any(const union sctp_addr *addr)
 340 {
 341         return INADDR_ANY == addr->v4.sin_addr.s_addr;
 342 }
 343
 344 /* This function checks if the address is a valid address to be used for
 345  * SCTP binding.
 346  *
 347  * Output:
 348  * Return 0 - If the address is a non-unicast or an illegal address.
 349  * Return 1 - If the address is a unicast.
 350  */
 351 static int sctp_v4_addr_valid(union sctp_addr *addr,
 352                               struct sctp_sock *sp,
 353                               const struct sk_buff *skb)
 354 {
 355         /* Is this a non-unicast address or a unusable SCTP address? */
 356         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
 357                 return 0;
 358
 359         /* Is this a broadcast address? */
 360         if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
 361                 return 0;
 362
 363         return 1;
 364 }
 365
 366 /* Should this be available for binding?   */
 367 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 368 {
 369         int ret = inet_addr_type(addr->v4.sin_addr.s_addr);
 370
 371
 372         if (addr->v4.sin_addr.s_addr != INADDR_ANY &&
 373            ret != RTN_LOCAL &&
 374            !sp->inet.freebind &&
 375            !sysctl_ip_nonlocal_bind)
 376                 return 0;
 377
 378         return 1;
 379 }
 380
 381 /* Checking the loopback, private and other address scopes as defined in
 382  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 383  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 384  *
 385  * Level 0 - unusable SCTP addresses
 386  * Level 1 - loopback address
 387  * Level 2 - link-local addresses
 388  * Level 3 - private addresses.
 389  * Level 4 - global addresses
 390  * For INIT and INIT-ACK address list, let L be the level of
 391  * of requested destination address, sender and receiver
 392  * SHOULD include all of its addresses with level greater
 393  * than or equal to L.
 394  */
 395 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 396 {
 397         sctp_scope_t retval;
 398
 399         /* Should IPv4 scoping be a sysctl configurable option
 400          * so users can turn it off (default on) for certain
 401          * unconventional networking environments?
 402          */
 403
 404         /* Check for unusable SCTP addresses. */
 405         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 406                 retval =  SCTP_SCOPE_UNUSABLE;
 407         } else if (LOOPBACK(addr->v4.sin_addr.s_addr)) {
 408                 retval = SCTP_SCOPE_LOOPBACK;
 409         } else if (IS_IPV4_LINK_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 410                 retval = SCTP_SCOPE_LINK;
 411         } else if (IS_IPV4_PRIVATE_ADDRESS(&addr->v4.sin_addr.s_addr)) {
 412                 retval = SCTP_SCOPE_PRIVATE;
 413         } else {
 414                 retval = SCTP_SCOPE_GLOBAL;
 415         }
 416
 417         return retval;
 418 }
 419
 420 /* Returns a valid dst cache entry for the given source and destination ip
 421  * addresses. If an association is passed, trys to get a dst entry with a
 422  * source address that matches an address in the bind address list.
 423  */
 424 static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
 425                                          union sctp_addr *daddr,
 426                                          union sctp_addr *saddr)
 427 {
 428         struct rtable *rt;
 429         struct flowi fl;
 430         struct sctp_bind_addr *bp;
 431         struct sctp_sockaddr_entry *laddr;
 432         struct dst_entry *dst = NULL;
 433         union sctp_addr dst_saddr;
 434
 435         memset(&fl, 0x0, sizeof(struct flowi));
 436         fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 437         fl.proto = IPPROTO_SCTP;
 438         if (asoc) {
 439                 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
 440                 fl.oif = asoc->base.sk->sk_bound_dev_if;
 441         }
 442         if (saddr)
 443                 fl.fl4_src = saddr->v4.sin_addr.s_addr;
 444
 445         SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
 446                           __FUNCTION__, NIPQUAD(fl.fl4_dst),
 447                           NIPQUAD(fl.fl4_src));
 448
 449         if (!ip_route_output_key(&rt, &fl)) {
 450                 dst = &rt->u.dst;
 451         }
 452
 453         /* If there is no association or if a source address is passed, no
 454          * more validation is required.
 455          */
 456         if (!asoc || saddr)
 457                 goto out;
 458
 459         bp = &asoc->base.bind_addr;
 460
 461         if (dst) {
 462                 /* Walk through the bind address list and look for a bind
 463                  * address that matches the source address of the returned dst.
 464                  */
 465                 rcu_read_lock();
 466                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 467                         if (!laddr->valid || !laddr->use_as_src)
 468                                 continue;
 469                         sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 470                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 471                                 goto out_unlock;
 472                 }
 473                 rcu_read_unlock();
 474
 475                 /* None of the bound addresses match the source address of the
 476                  * dst. So release it.
 477                  */
 478                 dst_release(dst);
 479                 dst = NULL;
 480         }
 481
 482         /* Walk through the bind address list and try to get a dst that
 483          * matches a bind address as the source address.
 484          */
 485         rcu_read_lock();
 486         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 487                 if (!laddr->valid)
 488                         continue;
 489                 if ((laddr->use_as_src) &&
 490                     (AF_INET == laddr->a.sa.sa_family)) {
 491                         fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
 492                         if (!ip_route_output_key(&rt, &fl)) {
 493                                 dst = &rt->u.dst;
 494                                 goto out_unlock;
 495                         }
 496                 }
 497         }
 498
 499 out_unlock:
 500         rcu_read_unlock();
 501 out:
 502         if (dst)
 503                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
 504                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
 505         else
 506                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 507
 508         return dst;
 509 }
 510
 511 /* For v4, the source address is cached in the route entry(dst). So no need
 512  * to cache it separately and hence this is an empty routine.
 513  */
 514 static void sctp_v4_get_saddr(struct sctp_association *asoc,
 515                               struct dst_entry *dst,
 516                               union sctp_addr *daddr,
 517                               union sctp_addr *saddr)
 518 {
 519         struct rtable *rt = (struct rtable *)dst;
 520
 521         if (!asoc)
 522                 return;
 523
 524         if (rt) {
 525                 saddr->v4.sin_family = AF_INET;
 526                 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 527                 saddr->v4.sin_addr.s_addr = rt->rt_src;
 528         }
 529 }
 530
 531 /* What interface did this skb arrive on? */
 532 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 533 {
 534         return ((struct rtable *)skb->dst)->rt_iif;
 535 }
 536
 537 /* Was this packet marked by Explicit Congestion Notification? */
 538 static int sctp_v4_is_ce(const struct sk_buff *skb)
 539 {
 540         return INET_ECN_is_ce(ip_hdr(skb)->tos);
 541 }
 542
 543 /* Create and initialize a new sk for the socket returned by accept(). */
 544 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 545                                              struct sctp_association *asoc)
 546 {
 547         struct inet_sock *inet = inet_sk(sk);
 548         struct inet_sock *newinet;
 549         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
 550
 551         if (!newsk)
 552                 goto out;
 553
 554         sock_init_data(NULL, newsk);
 555
 556         newsk->sk_type = SOCK_STREAM;
 557
 558         newsk->sk_no_check = sk->sk_no_check;
 559         newsk->sk_reuse = sk->sk_reuse;
 560         newsk->sk_shutdown = sk->sk_shutdown;
 561
 562         newsk->sk_destruct = inet_sock_destruct;
 563         newsk->sk_family = PF_INET;
 564         newsk->sk_protocol = IPPROTO_SCTP;
 565         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 566         sock_reset_flag(newsk, SOCK_ZAPPED);
 567
 568         newinet = inet_sk(newsk);
 569
 570         /* Initialize sk's sport, dport, rcv_saddr and daddr for
 571          * getsockname() and getpeername()
 572          */
 573         newinet->sport = inet->sport;
 574         newinet->saddr = inet->saddr;
 575         newinet->rcv_saddr = inet->rcv_saddr;
 576         newinet->dport = htons(asoc->peer.port);
 577         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 578         newinet->pmtudisc = inet->pmtudisc;
 579         newinet->id = asoc->next_tsn ^ jiffies;
 580
 581         newinet->uc_ttl = -1;
 582         newinet->mc_loop = 1;
 583         newinet->mc_ttl = 1;
 584         newinet->mc_index = 0;
 585         newinet->mc_list = NULL;
 586
 587         sk_refcnt_debug_inc(newsk);
 588
 589         if (newsk->sk_prot->init(newsk)) {
 590                 sk_common_release(newsk);
 591                 newsk = NULL;
 592         }
 593
 594 out:
 595         return newsk;
 596 }
 597
 598 /* Map address, empty for v4 family */
 599 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 600 {
 601         /* Empty */
 602 }
 603
 604 /* Dump the v4 addr to the seq file. */
 605 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 606 {
 607         seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
 608 }
 609
 610 /* Event handler for inet address addition/deletion events.
 611  * The sctp_local_addr_list needs to be protocted by a spin lock since
 612  * multiple notifiers (say IPv4 and IPv6) may be running at the same
 613  * time and thus corrupt the list.
 614  * The reader side is protected with RCU.
 615  */
 616 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 617                                void *ptr)
 618 {
 619         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 620         struct sctp_sockaddr_entry *addr = NULL;
 621         struct sctp_sockaddr_entry *temp;
 622
 623         switch (ev) {
 624         case NETDEV_UP:
 625                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 626                 if (addr) {
 627                         addr->a.v4.sin_family = AF_INET;
 628                         addr->a.v4.sin_port = 0;
 629                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 630                         addr->valid = 1;
 631                         spin_lock_bh(&sctp_local_addr_lock);
 632                         list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 633                         spin_unlock_bh(&sctp_local_addr_lock);
 634                 }
 635                 break;
 636         case NETDEV_DOWN:
 637                 spin_lock_bh(&sctp_local_addr_lock);
 638                 list_for_each_entry_safe(addr, temp,
 639                                         &sctp_local_addr_list, list) {
 640                         if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
 641                                 addr->valid = 0;
 642                                 list_del_rcu(&addr->list);
 643                                 break;
 644                         }
 645                 }
 646                 spin_unlock_bh(&sctp_local_addr_lock);
 647                 if (addr && !addr->valid)
 648                         call_rcu(&addr->rcu, sctp_local_addr_free);
 649                 break;
 650         }
 651
 652         return NOTIFY_DONE;
 653 }
 654
 655 /*
 656  * Initialize the control inode/socket with a control endpoint data
 657  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 658  */
 659 static int sctp_ctl_sock_init(void)
 660 {
 661         int err;
 662         sa_family_t family;
 663
 664         if (sctp_get_pf_specific(PF_INET6))
 665                 family = PF_INET6;
 666         else
 667                 family = PF_INET;
 668
 669         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
 670                                &sctp_ctl_socket);
 671         if (err < 0) {
 672                 printk(KERN_ERR
 673                        "SCTP: Failed to create the SCTP control socket.\n");
 674                 return err;
 675         }
 676         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
 677         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
 678
 679         return 0;
 680 }
 681
 682 /* Register address family specific functions. */
 683 int sctp_register_af(struct sctp_af *af)
 684 {
 685         switch (af->sa_family) {
 686         case AF_INET:
 687                 if (sctp_af_v4_specific)
 688                         return 0;
 689                 sctp_af_v4_specific = af;
 690                 break;
 691         case AF_INET6:
 692                 if (sctp_af_v6_specific)
 693                         return 0;
 694                 sctp_af_v6_specific = af;
 695                 break;
 696         default:
 697                 return 0;
 698         }
 699
 700         INIT_LIST_HEAD(&af->list);
 701         list_add_tail(&af->list, &sctp_address_families);
 702         return 1;
 703 }
 704
 705 /* Get the table of functions for manipulating a particular address
 706  * family.
 707  */
 708 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 709 {
 710         switch (family) {
 711         case AF_INET:
 712                 return sctp_af_v4_specific;
 713         case AF_INET6:
 714                 return sctp_af_v6_specific;
 715         default:
 716                 return NULL;
 717         }
 718 }
 719
 720 /* Common code to initialize a AF_INET msg_name. */
 721 static void sctp_inet_msgname(char *msgname, int *addr_len)
 722 {
 723         struct sockaddr_in *sin;
 724
 725         sin = (struct sockaddr_in *)msgname;
 726         *addr_len = sizeof(struct sockaddr_in);
 727         sin->sin_family = AF_INET;
 728         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 729 }
 730
 731 /* Copy the primary address of the peer primary address as the msg_name. */
 732 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 733                                     int *addr_len)
 734 {
 735         struct sockaddr_in *sin, *sinfrom;
 736
 737         if (msgname) {
 738                 struct sctp_association *asoc;
 739
 740                 asoc = event->asoc;
 741                 sctp_inet_msgname(msgname, addr_len);
 742                 sin = (struct sockaddr_in *)msgname;
 743                 sinfrom = &asoc->peer.primary_addr.v4;
 744                 sin->sin_port = htons(asoc->peer.port);
 745                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 746         }
 747 }
 748
 749 /* Initialize and copy out a msgname from an inbound skb. */
 750 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 751 {
 752         if (msgname) {
 753                 struct sctphdr *sh = sctp_hdr(skb);
 754                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 755
 756                 sctp_inet_msgname(msgname, len);
 757                 sin->sin_port = sh->source;
 758                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 759         }
 760 }
 761
 762 /* Do we support this AF? */
 763 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 764 {
 765         /* PF_INET only supports AF_INET addresses. */
 766         return (AF_INET == family);
 767 }
 768
 769 /* Address matching with wildcards allowed. */
 770 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 771                               const union sctp_addr *addr2,
 772                               struct sctp_sock *opt)
 773 {
 774         /* PF_INET only supports AF_INET addresses. */
 775         if (addr1->sa.sa_family != addr2->sa.sa_family)
 776                 return 0;
 777         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
 778             INADDR_ANY == addr2->v4.sin_addr.s_addr)
 779                 return 1;
 780         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 781                 return 1;
 782
 783         return 0;
 784 }
 785
 786 /* Verify that provided sockaddr looks bindable.  Common verification has
 787  * already been taken care of.
 788  */
 789 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 790 {
 791         return sctp_v4_available(addr, opt);
 792 }
 793
 794 /* Verify that sockaddr looks sendable.  Common verification has already
 795  * been taken care of.
 796  */
 797 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 798 {
 799         return 1;
 800 }
 801
 802 /* Fill in Supported Address Type information for INIT and INIT-ACK
 803  * chunks.  Returns number of addresses supported.
 804  */
 805 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 806                                      __be16 *types)
 807 {
 808         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 809         return 1;
 810 }
 811
 812 /* Wrapper routine that calls the ip transmit routine. */
 813 static inline int sctp_v4_xmit(struct sk_buff *skb,
 814                                struct sctp_transport *transport, int ipfragok)
 815 {
 816         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 817                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
 818                           __FUNCTION__, skb, skb->len,
 819                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
 820                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 821
 822         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 823         return ip_queue_xmit(skb, ipfragok);
 824 }
 825
 826 static struct sctp_af sctp_ipv4_specific;
 827
 828 static struct sctp_pf sctp_pf_inet = {
 829         .event_msgname = sctp_inet_event_msgname,
 830         .skb_msgname   = sctp_inet_skb_msgname,
 831         .af_supported  = sctp_inet_af_supported,
 832         .cmp_addr      = sctp_inet_cmp_addr,
 833         .bind_verify   = sctp_inet_bind_verify,
 834         .send_verify   = sctp_inet_send_verify,
 835         .supported_addrs = sctp_inet_supported_addrs,
 836         .create_accept_sk = sctp_v4_create_accept_sk,
 837         .addr_v4map     = sctp_v4_addr_v4map,
 838         .af            = &sctp_ipv4_specific,
 839 };
 840
 841 /* Notifier for inetaddr addition/deletion events.  */
 842 static struct notifier_block sctp_inetaddr_notifier = {
 843         .notifier_call = sctp_inetaddr_event,
 844 };
 845
 846 /* Socket operations.  */
 847 static const struct proto_ops inet_seqpacket_ops = {
 848         .family            = PF_INET,
 849         .owner             = THIS_MODULE,
 850         .release           = inet_release,      /* Needs to be wrapped... */
 851         .bind              = inet_bind,
 852         .connect           = inet_dgram_connect,
 853         .socketpair        = sock_no_socketpair,
 854         .accept            = inet_accept,
 855         .getname           = inet_getname,      /* Semantics are different.  */
 856         .poll              = sctp_poll,
 857         .ioctl             = inet_ioctl,
 858         .listen            = sctp_inet_listen,
 859         .shutdown          = inet_shutdown,     /* Looks harmless.  */
 860         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 861         .getsockopt        = sock_common_getsockopt,
 862         .sendmsg           = inet_sendmsg,
 863         .recvmsg           = sock_common_recvmsg,
 864         .mmap              = sock_no_mmap,
 865         .sendpage          = sock_no_sendpage,
 866 #ifdef CONFIG_COMPAT
 867         .compat_setsockopt = compat_sock_common_setsockopt,
 868         .compat_getsockopt = compat_sock_common_getsockopt,
 869 #endif
 870 };
 871
 872 /* Registration with AF_INET family.  */
 873 static struct inet_protosw sctp_seqpacket_protosw = {
 874         .type       = SOCK_SEQPACKET,
 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 static struct inet_protosw sctp_stream_protosw = {
 883         .type       = SOCK_STREAM,
 884         .protocol   = IPPROTO_SCTP,
 885         .prot       = &sctp_prot,
 886         .ops        = &inet_seqpacket_ops,
 887         .capability = -1,
 888         .no_check   = 0,
 889         .flags      = SCTP_PROTOSW_FLAG
 890 };
 891
 892 /* Register with IP layer.  */
 893 static struct net_protocol sctp_protocol = {
 894         .handler     = sctp_rcv,
 895         .err_handler = sctp_v4_err,
 896         .no_policy   = 1,
 897 };
 898
 899 /* IPv4 address related functions.  */
 900 static struct sctp_af sctp_ipv4_specific = {
 901         .sa_family         = AF_INET,
 902         .sctp_xmit         = sctp_v4_xmit,
 903         .setsockopt        = ip_setsockopt,
 904         .getsockopt        = ip_getsockopt,
 905         .get_dst           = sctp_v4_get_dst,
 906         .get_saddr         = sctp_v4_get_saddr,
 907         .copy_addrlist     = sctp_v4_copy_addrlist,
 908         .from_skb          = sctp_v4_from_skb,
 909         .from_sk           = sctp_v4_from_sk,
 910         .to_sk_saddr       = sctp_v4_to_sk_saddr,
 911         .to_sk_daddr       = sctp_v4_to_sk_daddr,
 912         .from_addr_param   = sctp_v4_from_addr_param,
 913         .to_addr_param     = sctp_v4_to_addr_param,
 914         .dst_saddr         = sctp_v4_dst_saddr,
 915         .cmp_addr          = sctp_v4_cmp_addr,
 916         .addr_valid        = sctp_v4_addr_valid,
 917         .inaddr_any        = sctp_v4_inaddr_any,
 918         .is_any            = sctp_v4_is_any,
 919         .available         = sctp_v4_available,
 920         .scope             = sctp_v4_scope,
 921         .skb_iif           = sctp_v4_skb_iif,
 922         .is_ce             = sctp_v4_is_ce,
 923         .seq_dump_addr     = sctp_v4_seq_dump_addr,
 924         .net_header_len    = sizeof(struct iphdr),
 925         .sockaddr_len      = sizeof(struct sockaddr_in),
 926 #ifdef CONFIG_COMPAT
 927         .compat_setsockopt = compat_ip_setsockopt,
 928         .compat_getsockopt = compat_ip_getsockopt,
 929 #endif
 930 };
 931
 932 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 933
 934         switch (family) {
 935         case PF_INET:
 936                 return sctp_pf_inet_specific;
 937         case PF_INET6:
 938                 return sctp_pf_inet6_specific;
 939         default:
 940                 return NULL;
 941         }
 942 }
 943
 944 /* Register the PF specific function table.  */
 945 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 946 {
 947         switch (family) {
 948         case PF_INET:
 949                 if (sctp_pf_inet_specific)
 950                         return 0;
 951                 sctp_pf_inet_specific = pf;
 952                 break;
 953         case PF_INET6:
 954                 if (sctp_pf_inet6_specific)
 955                         return 0;
 956                 sctp_pf_inet6_specific = pf;
 957                 break;
 958         default:
 959                 return 0;
 960         }
 961         return 1;
 962 }
 963
 964 static int __init init_sctp_mibs(void)
 965 {
 966         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
 967         if (!sctp_statistics[0])
 968                 return -ENOMEM;
 969         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
 970         if (!sctp_statistics[1]) {
 971                 free_percpu(sctp_statistics[0]);
 972                 return -ENOMEM;
 973         }
 974         return 0;
 975
 976 }
 977
 978 static void cleanup_sctp_mibs(void)
 979 {
 980         free_percpu(sctp_statistics[0]);
 981         free_percpu(sctp_statistics[1]);
 982 }
 983
 984 /* Initialize the universe into something sensible.  */
 985 SCTP_STATIC __init int sctp_init(void)
 986 {
 987         int i;
 988         int status = -EINVAL;
 989         unsigned long goal;
 990         int order;
 991
 992         /* SCTP_DEBUG sanity check. */
 993         if (!sctp_sanity_check())
 994                 goto out;
 995
 996         /* Allocate bind_bucket and chunk caches. */
 997         status = -ENOBUFS;
 998         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
 999                                                sizeof(struct sctp_bind_bucket),
1000                                                0, SLAB_HWCACHE_ALIGN,
1001                                                NULL);
1002         if (!sctp_bucket_cachep)
1003                 goto out;
1004
1005         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1006                                                sizeof(struct sctp_chunk),
1007                                                0, SLAB_HWCACHE_ALIGN,
1008                                                NULL);
1009         if (!sctp_chunk_cachep)
1010                 goto err_chunk_cachep;
1011
1012         /* Allocate and initialise sctp mibs.  */
1013         status = init_sctp_mibs();
1014         if (status)
1015                 goto err_init_mibs;
1016
1017         /* Initialize proc fs directory.  */
1018         status = sctp_proc_init();
1019         if (status)
1020                 goto err_init_proc;
1021
1022         /* Initialize object count debugging.  */
1023         sctp_dbg_objcnt_init();
1024
1025         /* Initialize the SCTP specific PF functions. */
1026         sctp_register_pf(&sctp_pf_inet, PF_INET);
1027         /*
1028          * 14. Suggested SCTP Protocol Parameter Values
1029          */
1030         /* The following protocol parameters are RECOMMENDED:  */
1031         /* RTO.Initial              - 3  seconds */
1032         sctp_rto_initial                = SCTP_RTO_INITIAL;
1033         /* RTO.Min                  - 1  second */
1034         sctp_rto_min                    = SCTP_RTO_MIN;
1035         /* RTO.Max                 -  60 seconds */
1036         sctp_rto_max                    = SCTP_RTO_MAX;
1037         /* RTO.Alpha                - 1/8 */
1038         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1039         /* RTO.Beta                 - 1/4 */
1040         sctp_rto_beta                   = SCTP_RTO_BETA;
1041
1042         /* Valid.Cookie.Life        - 60  seconds */
1043         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1044
1045         /* Whether Cookie Preservative is enabled(1) or not(0) */
1046         sctp_cookie_preserve_enable     = 1;
1047
1048         /* Max.Burst                - 4 */
1049         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1050
1051         /* Association.Max.Retrans  - 10 attempts
1052          * Path.Max.Retrans         - 5  attempts (per destination address)
1053          * Max.Init.Retransmits     - 8  attempts
1054          */
1055         sctp_max_retrans_association    = 10;
1056         sctp_max_retrans_path           = 5;
1057         sctp_max_retrans_init           = 8;
1058
1059         /* Sendbuffer growth        - do per-socket accounting */
1060         sctp_sndbuf_policy              = 0;
1061
1062         /* Rcvbuffer growth         - do per-socket accounting */
1063         sctp_rcvbuf_policy              = 0;
1064
1065         /* HB.interval              - 30 seconds */
1066         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1067
1068         /* delayed SACK timeout */
1069         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1070
1071         /* Implementation specific variables. */
1072
1073         /* Initialize default stream count setup information. */
1074         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1075         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1076
1077         /* Initialize handle used for association ids. */
1078         idr_init(&sctp_assocs_id);
1079
1080         /* Size and allocate the association hash table.
1081          * The methodology is similar to that of the tcp hash tables.
1082          */
1083         if (num_physpages >= (128 * 1024))
1084                 goal = num_physpages >> (22 - PAGE_SHIFT);
1085         else
1086                 goal = num_physpages >> (24 - PAGE_SHIFT);
1087
1088         for (order = 0; (1UL << order) < goal; order++)
1089                 ;
1090
1091         do {
1092                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1093                                         sizeof(struct sctp_hashbucket);
1094                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1095                         continue;
1096                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1097                                         __get_free_pages(GFP_ATOMIC, order);
1098         } while (!sctp_assoc_hashtable && --order > 0);
1099         if (!sctp_assoc_hashtable) {
1100                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1101                 status = -ENOMEM;
1102                 goto err_ahash_alloc;
1103         }
1104         for (i = 0; i < sctp_assoc_hashsize; i++) {
1105                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1106                 sctp_assoc_hashtable[i].chain = NULL;
1107         }
1108
1109         /* Allocate and initialize the endpoint hash table.  */
1110         sctp_ep_hashsize = 64;
1111         sctp_ep_hashtable = (struct sctp_hashbucket *)
1112                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1113         if (!sctp_ep_hashtable) {
1114                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1115                 status = -ENOMEM;
1116                 goto err_ehash_alloc;
1117         }
1118         for (i = 0; i < sctp_ep_hashsize; i++) {
1119                 rwlock_init(&sctp_ep_hashtable[i].lock);
1120                 sctp_ep_hashtable[i].chain = NULL;
1121         }
1122
1123         /* Allocate and initialize the SCTP port hash table.  */
1124         do {
1125                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1126                                         sizeof(struct sctp_bind_hashbucket);
1127                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1128                         continue;
1129                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1130                                         __get_free_pages(GFP_ATOMIC, order);
1131         } while (!sctp_port_hashtable && --order > 0);
1132         if (!sctp_port_hashtable) {
1133                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1134                 status = -ENOMEM;
1135                 goto err_bhash_alloc;
1136         }
1137         for (i = 0; i < sctp_port_hashsize; i++) {
1138                 spin_lock_init(&sctp_port_hashtable[i].lock);
1139                 sctp_port_hashtable[i].chain = NULL;
1140         }
1141
1142         spin_lock_init(&sctp_port_alloc_lock);
1143         sctp_port_rover = sysctl_local_port_range[0] - 1;
1144
1145         printk(KERN_INFO "SCTP: Hash tables configured "
1146                          "(established %d bind %d)\n",
1147                 sctp_assoc_hashsize, sctp_port_hashsize);
1148
1149         /* Disable ADDIP by default. */
1150         sctp_addip_enable = 0;
1151
1152         /* Enable PR-SCTP by default. */
1153         sctp_prsctp_enable = 1;
1154
1155         sctp_sysctl_register();
1156
1157         INIT_LIST_HEAD(&sctp_address_families);
1158         sctp_register_af(&sctp_ipv4_specific);
1159
1160         status = proto_register(&sctp_prot, 1);
1161         if (status)
1162                 goto err_proto_register;
1163
1164         /* Register SCTP(UDP and TCP style) with socket layer.  */
1165         inet_register_protosw(&sctp_seqpacket_protosw);
1166         inet_register_protosw(&sctp_stream_protosw);
1167
1168         status = sctp_v6_init();
1169         if (status)
1170                 goto err_v6_init;
1171
1172         /* Initialize the control inode/socket for handling OOTB packets.  */
1173         if ((status = sctp_ctl_sock_init())) {
1174                 printk (KERN_ERR
1175                         "SCTP: Failed to initialize the SCTP control sock.\n");
1176                 goto err_ctl_sock_init;
1177         }
1178
1179         /* Initialize the local address list. */
1180         INIT_LIST_HEAD(&sctp_local_addr_list);
1181         spin_lock_init(&sctp_local_addr_lock);
1182         sctp_get_local_addr_list();
1183
1184         /* Register notifier for inet address additions/deletions. */
1185         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1186
1187         /* Register SCTP with inet layer.  */
1188         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) {
1189                 status = -EAGAIN;
1190                 goto err_add_protocol;
1191         }
1192
1193         /* Register SCTP with inet6 layer.  */
1194         status = sctp_v6_add_protocol();
1195         if (status)
1196                 goto err_v6_add_protocol;
1197
1198         __unsafe(THIS_MODULE);
1199         status = 0;
1200 out:
1201         return status;
1202 err_v6_add_protocol:
1203         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1204         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1205 err_add_protocol:
1206         sctp_free_local_addr_list();
1207         sock_release(sctp_ctl_socket);
1208 err_ctl_sock_init:
1209         sctp_v6_exit();
1210 err_v6_init:
1211         inet_unregister_protosw(&sctp_stream_protosw);
1212         inet_unregister_protosw(&sctp_seqpacket_protosw);
1213         proto_unregister(&sctp_prot);
1214 err_proto_register:
1215         sctp_sysctl_unregister();
1216         list_del(&sctp_ipv4_specific.list);
1217         free_pages((unsigned long)sctp_port_hashtable,
1218                    get_order(sctp_port_hashsize *
1219                              sizeof(struct sctp_bind_hashbucket)));
1220 err_bhash_alloc:
1221         kfree(sctp_ep_hashtable);
1222 err_ehash_alloc:
1223         free_pages((unsigned long)sctp_assoc_hashtable,
1224                    get_order(sctp_assoc_hashsize *
1225                              sizeof(struct sctp_hashbucket)));
1226 err_ahash_alloc:
1227         sctp_dbg_objcnt_exit();
1228         sctp_proc_exit();
1229 err_init_proc:
1230         cleanup_sctp_mibs();
1231 err_init_mibs:
1232         kmem_cache_destroy(sctp_chunk_cachep);
1233 err_chunk_cachep:
1234         kmem_cache_destroy(sctp_bucket_cachep);
1235         goto out;
1236 }
1237
1238 /* Exit handler for the SCTP protocol.  */
1239 SCTP_STATIC __exit void sctp_exit(void)
1240 {
1241         /* BUG.  This should probably do something useful like clean
1242          * up all the remaining associations and all that memory.
1243          */
1244
1245         /* Unregister with inet6/inet layers. */
1246         sctp_v6_del_protocol();
1247         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1248
1249         /* Unregister notifier for inet address additions/deletions. */
1250         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1251
1252         /* Free the local address list.  */
1253         sctp_free_local_addr_list();
1254
1255         /* Free the control endpoint.  */
1256         sock_release(sctp_ctl_socket);
1257
1258         /* Cleanup v6 initializations. */
1259         sctp_v6_exit();
1260
1261         /* Unregister with socket layer. */
1262         inet_unregister_protosw(&sctp_stream_protosw);
1263         inet_unregister_protosw(&sctp_seqpacket_protosw);
1264
1265         sctp_sysctl_unregister();
1266         list_del(&sctp_ipv4_specific.list);
1267
1268         free_pages((unsigned long)sctp_assoc_hashtable,
1269                    get_order(sctp_assoc_hashsize *
1270                              sizeof(struct sctp_hashbucket)));
1271         kfree(sctp_ep_hashtable);
1272         free_pages((unsigned long)sctp_port_hashtable,
1273                    get_order(sctp_port_hashsize *
1274                              sizeof(struct sctp_bind_hashbucket)));
1275
1276         sctp_dbg_objcnt_exit();
1277         sctp_proc_exit();
1278         cleanup_sctp_mibs();
1279
1280         kmem_cache_destroy(sctp_chunk_cachep);
1281         kmem_cache_destroy(sctp_bucket_cachep);
1282
1283         proto_unregister(&sctp_prot);
1284 }
1285
1286 module_init(sctp_init);
1287 module_exit(sctp_exit);
1288
1289 /*
1290  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1291  */
1292 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1293 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1294 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1295 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1296 MODULE_LICENSE("GPL");