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         rwlock_t *addr_lock;
 432         struct sctp_sockaddr_entry *laddr;
 433         struct list_head *pos;
 434         struct dst_entry *dst = NULL;
 435         union sctp_addr dst_saddr;
 436
 437         memset(&fl, 0x0, sizeof(struct flowi));
 438         fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 439         fl.proto = IPPROTO_SCTP;
 440         if (asoc) {
 441                 fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
 442                 fl.oif = asoc->base.sk->sk_bound_dev_if;
 443         }
 444         if (saddr)
 445                 fl.fl4_src = saddr->v4.sin_addr.s_addr;
 446
 447         SCTP_DEBUG_PRINTK("%s: DST:%u.%u.%u.%u, SRC:%u.%u.%u.%u - ",
 448                           __FUNCTION__, NIPQUAD(fl.fl4_dst),
 449                           NIPQUAD(fl.fl4_src));
 450
 451         if (!ip_route_output_key(&rt, &fl)) {
 452                 dst = &rt->u.dst;
 453         }
 454
 455         /* If there is no association or if a source address is passed, no
 456          * more validation is required.
 457          */
 458         if (!asoc || saddr)
 459                 goto out;
 460
 461         bp = &asoc->base.bind_addr;
 462         addr_lock = &asoc->base.addr_lock;
 463
 464         if (dst) {
 465                 /* Walk through the bind address list and look for a bind
 466                  * address that matches the source address of the returned dst.
 467                  */
 468                 sctp_read_lock(addr_lock);
 469                 list_for_each(pos, &bp->address_list) {
 470                         laddr = list_entry(pos, struct sctp_sockaddr_entry,
 471                                            list);
 472                         if (!laddr->use_as_src)
 473                                 continue;
 474                         sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 475                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 476                                 goto out_unlock;
 477                 }
 478                 sctp_read_unlock(addr_lock);
 479
 480                 /* None of the bound addresses match the source address of the
 481                  * dst. So release it.
 482                  */
 483                 dst_release(dst);
 484                 dst = NULL;
 485         }
 486
 487         /* Walk through the bind address list and try to get a dst that
 488          * matches a bind address as the source address.
 489          */
 490         sctp_read_lock(addr_lock);
 491         list_for_each(pos, &bp->address_list) {
 492                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
 493
 494                 if ((laddr->use_as_src) &&
 495                     (AF_INET == laddr->a.sa.sa_family)) {
 496                         fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
 497                         if (!ip_route_output_key(&rt, &fl)) {
 498                                 dst = &rt->u.dst;
 499                                 goto out_unlock;
 500                         }
 501                 }
 502         }
 503
 504 out_unlock:
 505         sctp_read_unlock(addr_lock);
 506 out:
 507         if (dst)
 508                 SCTP_DEBUG_PRINTK("rt_dst:%u.%u.%u.%u, rt_src:%u.%u.%u.%u\n",
 509                                   NIPQUAD(rt->rt_dst), NIPQUAD(rt->rt_src));
 510         else
 511                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 512
 513         return dst;
 514 }
 515
 516 /* For v4, the source address is cached in the route entry(dst). So no need
 517  * to cache it separately and hence this is an empty routine.
 518  */
 519 static void sctp_v4_get_saddr(struct sctp_association *asoc,
 520                               struct dst_entry *dst,
 521                               union sctp_addr *daddr,
 522                               union sctp_addr *saddr)
 523 {
 524         struct rtable *rt = (struct rtable *)dst;
 525
 526         if (!asoc)
 527                 return;
 528
 529         if (rt) {
 530                 saddr->v4.sin_family = AF_INET;
 531                 saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 532                 saddr->v4.sin_addr.s_addr = rt->rt_src;
 533         }
 534 }
 535
 536 /* What interface did this skb arrive on? */
 537 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 538 {
 539         return ((struct rtable *)skb->dst)->rt_iif;
 540 }
 541
 542 /* Was this packet marked by Explicit Congestion Notification? */
 543 static int sctp_v4_is_ce(const struct sk_buff *skb)
 544 {
 545         return INET_ECN_is_ce(ip_hdr(skb)->tos);
 546 }
 547
 548 /* Create and initialize a new sk for the socket returned by accept(). */
 549 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 550                                              struct sctp_association *asoc)
 551 {
 552         struct inet_sock *inet = inet_sk(sk);
 553         struct inet_sock *newinet;
 554         struct sock *newsk = sk_alloc(PF_INET, GFP_KERNEL, sk->sk_prot, 1);
 555
 556         if (!newsk)
 557                 goto out;
 558
 559         sock_init_data(NULL, newsk);
 560
 561         newsk->sk_type = SOCK_STREAM;
 562
 563         newsk->sk_no_check = sk->sk_no_check;
 564         newsk->sk_reuse = sk->sk_reuse;
 565         newsk->sk_shutdown = sk->sk_shutdown;
 566
 567         newsk->sk_destruct = inet_sock_destruct;
 568         newsk->sk_family = PF_INET;
 569         newsk->sk_protocol = IPPROTO_SCTP;
 570         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 571         sock_reset_flag(newsk, SOCK_ZAPPED);
 572
 573         newinet = inet_sk(newsk);
 574
 575         /* Initialize sk's sport, dport, rcv_saddr and daddr for
 576          * getsockname() and getpeername()
 577          */
 578         newinet->sport = inet->sport;
 579         newinet->saddr = inet->saddr;
 580         newinet->rcv_saddr = inet->rcv_saddr;
 581         newinet->dport = htons(asoc->peer.port);
 582         newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 583         newinet->pmtudisc = inet->pmtudisc;
 584         newinet->id = asoc->next_tsn ^ jiffies;
 585
 586         newinet->uc_ttl = -1;
 587         newinet->mc_loop = 1;
 588         newinet->mc_ttl = 1;
 589         newinet->mc_index = 0;
 590         newinet->mc_list = NULL;
 591
 592         sk_refcnt_debug_inc(newsk);
 593
 594         if (newsk->sk_prot->init(newsk)) {
 595                 sk_common_release(newsk);
 596                 newsk = NULL;
 597         }
 598
 599 out:
 600         return newsk;
 601 }
 602
 603 /* Map address, empty for v4 family */
 604 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 605 {
 606         /* Empty */
 607 }
 608
 609 /* Dump the v4 addr to the seq file. */
 610 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 611 {
 612         seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
 613 }
 614
 615 /* Event handler for inet address addition/deletion events.
 616  * The sctp_local_addr_list needs to be protocted by a spin lock since
 617  * multiple notifiers (say IPv4 and IPv6) may be running at the same
 618  * time and thus corrupt the list.
 619  * The reader side is protected with RCU.
 620  */
 621 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 622                                void *ptr)
 623 {
 624         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 625         struct sctp_sockaddr_entry *addr = NULL;
 626         struct sctp_sockaddr_entry *temp;
 627
 628         switch (ev) {
 629         case NETDEV_UP:
 630                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 631                 if (addr) {
 632                         addr->a.v4.sin_family = AF_INET;
 633                         addr->a.v4.sin_port = 0;
 634                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 635                         addr->valid = 1;
 636                         spin_lock_bh(&sctp_local_addr_lock);
 637                         list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 638                         spin_unlock_bh(&sctp_local_addr_lock);
 639                 }
 640                 break;
 641         case NETDEV_DOWN:
 642                 spin_lock_bh(&sctp_local_addr_lock);
 643                 list_for_each_entry_safe(addr, temp,
 644                                         &sctp_local_addr_list, list) {
 645                         if (addr->a.v4.sin_addr.s_addr == ifa->ifa_local) {
 646                                 addr->valid = 0;
 647                                 list_del_rcu(&addr->list);
 648                                 break;
 649                         }
 650                 }
 651                 spin_unlock_bh(&sctp_local_addr_lock);
 652                 if (addr && !addr->valid)
 653                         call_rcu(&addr->rcu, sctp_local_addr_free);
 654                 break;
 655         }
 656
 657         return NOTIFY_DONE;
 658 }
 659
 660 /*
 661  * Initialize the control inode/socket with a control endpoint data
 662  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 663  */
 664 static int sctp_ctl_sock_init(void)
 665 {
 666         int err;
 667         sa_family_t family;
 668
 669         if (sctp_get_pf_specific(PF_INET6))
 670                 family = PF_INET6;
 671         else
 672                 family = PF_INET;
 673
 674         err = sock_create_kern(family, SOCK_SEQPACKET, IPPROTO_SCTP,
 675                                &sctp_ctl_socket);
 676         if (err < 0) {
 677                 printk(KERN_ERR
 678                        "SCTP: Failed to create the SCTP control socket.\n");
 679                 return err;
 680         }
 681         sctp_ctl_socket->sk->sk_allocation = GFP_ATOMIC;
 682         inet_sk(sctp_ctl_socket->sk)->uc_ttl = -1;
 683
 684         return 0;
 685 }
 686
 687 /* Register address family specific functions. */
 688 int sctp_register_af(struct sctp_af *af)
 689 {
 690         switch (af->sa_family) {
 691         case AF_INET:
 692                 if (sctp_af_v4_specific)
 693                         return 0;
 694                 sctp_af_v4_specific = af;
 695                 break;
 696         case AF_INET6:
 697                 if (sctp_af_v6_specific)
 698                         return 0;
 699                 sctp_af_v6_specific = af;
 700                 break;
 701         default:
 702                 return 0;
 703         }
 704
 705         INIT_LIST_HEAD(&af->list);
 706         list_add_tail(&af->list, &sctp_address_families);
 707         return 1;
 708 }
 709
 710 /* Get the table of functions for manipulating a particular address
 711  * family.
 712  */
 713 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 714 {
 715         switch (family) {
 716         case AF_INET:
 717                 return sctp_af_v4_specific;
 718         case AF_INET6:
 719                 return sctp_af_v6_specific;
 720         default:
 721                 return NULL;
 722         }
 723 }
 724
 725 /* Common code to initialize a AF_INET msg_name. */
 726 static void sctp_inet_msgname(char *msgname, int *addr_len)
 727 {
 728         struct sockaddr_in *sin;
 729
 730         sin = (struct sockaddr_in *)msgname;
 731         *addr_len = sizeof(struct sockaddr_in);
 732         sin->sin_family = AF_INET;
 733         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 734 }
 735
 736 /* Copy the primary address of the peer primary address as the msg_name. */
 737 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 738                                     int *addr_len)
 739 {
 740         struct sockaddr_in *sin, *sinfrom;
 741
 742         if (msgname) {
 743                 struct sctp_association *asoc;
 744
 745                 asoc = event->asoc;
 746                 sctp_inet_msgname(msgname, addr_len);
 747                 sin = (struct sockaddr_in *)msgname;
 748                 sinfrom = &asoc->peer.primary_addr.v4;
 749                 sin->sin_port = htons(asoc->peer.port);
 750                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 751         }
 752 }
 753
 754 /* Initialize and copy out a msgname from an inbound skb. */
 755 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 756 {
 757         if (msgname) {
 758                 struct sctphdr *sh = sctp_hdr(skb);
 759                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 760
 761                 sctp_inet_msgname(msgname, len);
 762                 sin->sin_port = sh->source;
 763                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 764         }
 765 }
 766
 767 /* Do we support this AF? */
 768 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 769 {
 770         /* PF_INET only supports AF_INET addresses. */
 771         return (AF_INET == family);
 772 }
 773
 774 /* Address matching with wildcards allowed. */
 775 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 776                               const union sctp_addr *addr2,
 777                               struct sctp_sock *opt)
 778 {
 779         /* PF_INET only supports AF_INET addresses. */
 780         if (addr1->sa.sa_family != addr2->sa.sa_family)
 781                 return 0;
 782         if (INADDR_ANY == addr1->v4.sin_addr.s_addr ||
 783             INADDR_ANY == addr2->v4.sin_addr.s_addr)
 784                 return 1;
 785         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 786                 return 1;
 787
 788         return 0;
 789 }
 790
 791 /* Verify that provided sockaddr looks bindable.  Common verification has
 792  * already been taken care of.
 793  */
 794 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 795 {
 796         return sctp_v4_available(addr, opt);
 797 }
 798
 799 /* Verify that sockaddr looks sendable.  Common verification has already
 800  * been taken care of.
 801  */
 802 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 803 {
 804         return 1;
 805 }
 806
 807 /* Fill in Supported Address Type information for INIT and INIT-ACK
 808  * chunks.  Returns number of addresses supported.
 809  */
 810 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 811                                      __be16 *types)
 812 {
 813         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 814         return 1;
 815 }
 816
 817 /* Wrapper routine that calls the ip transmit routine. */
 818 static inline int sctp_v4_xmit(struct sk_buff *skb,
 819                                struct sctp_transport *transport, int ipfragok)
 820 {
 821         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
 822                           "src:%u.%u.%u.%u, dst:%u.%u.%u.%u\n",
 823                           __FUNCTION__, skb, skb->len,
 824                           NIPQUAD(((struct rtable *)skb->dst)->rt_src),
 825                           NIPQUAD(((struct rtable *)skb->dst)->rt_dst));
 826
 827         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 828         return ip_queue_xmit(skb, ipfragok);
 829 }
 830
 831 static struct sctp_af sctp_ipv4_specific;
 832
 833 static struct sctp_pf sctp_pf_inet = {
 834         .event_msgname = sctp_inet_event_msgname,
 835         .skb_msgname   = sctp_inet_skb_msgname,
 836         .af_supported  = sctp_inet_af_supported,
 837         .cmp_addr      = sctp_inet_cmp_addr,
 838         .bind_verify   = sctp_inet_bind_verify,
 839         .send_verify   = sctp_inet_send_verify,
 840         .supported_addrs = sctp_inet_supported_addrs,
 841         .create_accept_sk = sctp_v4_create_accept_sk,
 842         .addr_v4map     = sctp_v4_addr_v4map,
 843         .af            = &sctp_ipv4_specific,
 844 };
 845
 846 /* Notifier for inetaddr addition/deletion events.  */
 847 static struct notifier_block sctp_inetaddr_notifier = {
 848         .notifier_call = sctp_inetaddr_event,
 849 };
 850
 851 /* Socket operations.  */
 852 static const struct proto_ops inet_seqpacket_ops = {
 853         .family            = PF_INET,
 854         .owner             = THIS_MODULE,
 855         .release           = inet_release,      /* Needs to be wrapped... */
 856         .bind              = inet_bind,
 857         .connect           = inet_dgram_connect,
 858         .socketpair        = sock_no_socketpair,
 859         .accept            = inet_accept,
 860         .getname           = inet_getname,      /* Semantics are different.  */
 861         .poll              = sctp_poll,
 862         .ioctl             = inet_ioctl,
 863         .listen            = sctp_inet_listen,
 864         .shutdown          = inet_shutdown,     /* Looks harmless.  */
 865         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 866         .getsockopt        = sock_common_getsockopt,
 867         .sendmsg           = inet_sendmsg,
 868         .recvmsg           = sock_common_recvmsg,
 869         .mmap              = sock_no_mmap,
 870         .sendpage          = sock_no_sendpage,
 871 #ifdef CONFIG_COMPAT
 872         .compat_setsockopt = compat_sock_common_setsockopt,
 873         .compat_getsockopt = compat_sock_common_getsockopt,
 874 #endif
 875 };
 876
 877 /* Registration with AF_INET family.  */
 878 static struct inet_protosw sctp_seqpacket_protosw = {
 879         .type       = SOCK_SEQPACKET,
 880         .protocol   = IPPROTO_SCTP,
 881         .prot       = &sctp_prot,
 882         .ops        = &inet_seqpacket_ops,
 883         .capability = -1,
 884         .no_check   = 0,
 885         .flags      = SCTP_PROTOSW_FLAG
 886 };
 887 static struct inet_protosw sctp_stream_protosw = {
 888         .type       = SOCK_STREAM,
 889         .protocol   = IPPROTO_SCTP,
 890         .prot       = &sctp_prot,
 891         .ops        = &inet_seqpacket_ops,
 892         .capability = -1,
 893         .no_check   = 0,
 894         .flags      = SCTP_PROTOSW_FLAG
 895 };
 896
 897 /* Register with IP layer.  */
 898 static struct net_protocol sctp_protocol = {
 899         .handler     = sctp_rcv,
 900         .err_handler = sctp_v4_err,
 901         .no_policy   = 1,
 902 };
 903
 904 /* IPv4 address related functions.  */
 905 static struct sctp_af sctp_ipv4_specific = {
 906         .sa_family         = AF_INET,
 907         .sctp_xmit         = sctp_v4_xmit,
 908         .setsockopt        = ip_setsockopt,
 909         .getsockopt        = ip_getsockopt,
 910         .get_dst           = sctp_v4_get_dst,
 911         .get_saddr         = sctp_v4_get_saddr,
 912         .copy_addrlist     = sctp_v4_copy_addrlist,
 913         .from_skb          = sctp_v4_from_skb,
 914         .from_sk           = sctp_v4_from_sk,
 915         .to_sk_saddr       = sctp_v4_to_sk_saddr,
 916         .to_sk_daddr       = sctp_v4_to_sk_daddr,
 917         .from_addr_param   = sctp_v4_from_addr_param,
 918         .to_addr_param     = sctp_v4_to_addr_param,
 919         .dst_saddr         = sctp_v4_dst_saddr,
 920         .cmp_addr          = sctp_v4_cmp_addr,
 921         .addr_valid        = sctp_v4_addr_valid,
 922         .inaddr_any        = sctp_v4_inaddr_any,
 923         .is_any            = sctp_v4_is_any,
 924         .available         = sctp_v4_available,
 925         .scope             = sctp_v4_scope,
 926         .skb_iif           = sctp_v4_skb_iif,
 927         .is_ce             = sctp_v4_is_ce,
 928         .seq_dump_addr     = sctp_v4_seq_dump_addr,
 929         .net_header_len    = sizeof(struct iphdr),
 930         .sockaddr_len      = sizeof(struct sockaddr_in),
 931 #ifdef CONFIG_COMPAT
 932         .compat_setsockopt = compat_ip_setsockopt,
 933         .compat_getsockopt = compat_ip_getsockopt,
 934 #endif
 935 };
 936
 937 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 938
 939         switch (family) {
 940         case PF_INET:
 941                 return sctp_pf_inet_specific;
 942         case PF_INET6:
 943                 return sctp_pf_inet6_specific;
 944         default:
 945                 return NULL;
 946         }
 947 }
 948
 949 /* Register the PF specific function table.  */
 950 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 951 {
 952         switch (family) {
 953         case PF_INET:
 954                 if (sctp_pf_inet_specific)
 955                         return 0;
 956                 sctp_pf_inet_specific = pf;
 957                 break;
 958         case PF_INET6:
 959                 if (sctp_pf_inet6_specific)
 960                         return 0;
 961                 sctp_pf_inet6_specific = pf;
 962                 break;
 963         default:
 964                 return 0;
 965         }
 966         return 1;
 967 }
 968
 969 static int __init init_sctp_mibs(void)
 970 {
 971         sctp_statistics[0] = alloc_percpu(struct sctp_mib);
 972         if (!sctp_statistics[0])
 973                 return -ENOMEM;
 974         sctp_statistics[1] = alloc_percpu(struct sctp_mib);
 975         if (!sctp_statistics[1]) {
 976                 free_percpu(sctp_statistics[0]);
 977                 return -ENOMEM;
 978         }
 979         return 0;
 980
 981 }
 982
 983 static void cleanup_sctp_mibs(void)
 984 {
 985         free_percpu(sctp_statistics[0]);
 986         free_percpu(sctp_statistics[1]);
 987 }
 988
 989 /* Initialize the universe into something sensible.  */
 990 SCTP_STATIC __init int sctp_init(void)
 991 {
 992         int i;
 993         int status = -EINVAL;
 994         unsigned long goal;
 995         int order;
 996
 997         /* SCTP_DEBUG sanity check. */
 998         if (!sctp_sanity_check())
 999                 goto out;
1000
1001         /* Allocate bind_bucket and chunk caches. */
1002         status = -ENOBUFS;
1003         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1004                                                sizeof(struct sctp_bind_bucket),
1005                                                0, SLAB_HWCACHE_ALIGN,
1006                                                NULL);
1007         if (!sctp_bucket_cachep)
1008                 goto out;
1009
1010         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1011                                                sizeof(struct sctp_chunk),
1012                                                0, SLAB_HWCACHE_ALIGN,
1013                                                NULL);
1014         if (!sctp_chunk_cachep)
1015                 goto err_chunk_cachep;
1016
1017         /* Allocate and initialise sctp mibs.  */
1018         status = init_sctp_mibs();
1019         if (status)
1020                 goto err_init_mibs;
1021
1022         /* Initialize proc fs directory.  */
1023         status = sctp_proc_init();
1024         if (status)
1025                 goto err_init_proc;
1026
1027         /* Initialize object count debugging.  */
1028         sctp_dbg_objcnt_init();
1029
1030         /* Initialize the SCTP specific PF functions. */
1031         sctp_register_pf(&sctp_pf_inet, PF_INET);
1032         /*
1033          * 14. Suggested SCTP Protocol Parameter Values
1034          */
1035         /* The following protocol parameters are RECOMMENDED:  */
1036         /* RTO.Initial              - 3  seconds */
1037         sctp_rto_initial                = SCTP_RTO_INITIAL;
1038         /* RTO.Min                  - 1  second */
1039         sctp_rto_min                    = SCTP_RTO_MIN;
1040         /* RTO.Max                 -  60 seconds */
1041         sctp_rto_max                    = SCTP_RTO_MAX;
1042         /* RTO.Alpha                - 1/8 */
1043         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1044         /* RTO.Beta                 - 1/4 */
1045         sctp_rto_beta                   = SCTP_RTO_BETA;
1046
1047         /* Valid.Cookie.Life        - 60  seconds */
1048         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1049
1050         /* Whether Cookie Preservative is enabled(1) or not(0) */
1051         sctp_cookie_preserve_enable     = 1;
1052
1053         /* Max.Burst                - 4 */
1054         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1055
1056         /* Association.Max.Retrans  - 10 attempts
1057          * Path.Max.Retrans         - 5  attempts (per destination address)
1058          * Max.Init.Retransmits     - 8  attempts
1059          */
1060         sctp_max_retrans_association    = 10;
1061         sctp_max_retrans_path           = 5;
1062         sctp_max_retrans_init           = 8;
1063
1064         /* Sendbuffer growth        - do per-socket accounting */
1065         sctp_sndbuf_policy              = 0;
1066
1067         /* Rcvbuffer growth         - do per-socket accounting */
1068         sctp_rcvbuf_policy              = 0;
1069
1070         /* HB.interval              - 30 seconds */
1071         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1072
1073         /* delayed SACK timeout */
1074         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1075
1076         /* Implementation specific variables. */
1077
1078         /* Initialize default stream count setup information. */
1079         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1080         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1081
1082         /* Initialize handle used for association ids. */
1083         idr_init(&sctp_assocs_id);
1084
1085         /* Size and allocate the association hash table.
1086          * The methodology is similar to that of the tcp hash tables.
1087          */
1088         if (num_physpages >= (128 * 1024))
1089                 goal = num_physpages >> (22 - PAGE_SHIFT);
1090         else
1091                 goal = num_physpages >> (24 - PAGE_SHIFT);
1092
1093         for (order = 0; (1UL << order) < goal; order++)
1094                 ;
1095
1096         do {
1097                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1098                                         sizeof(struct sctp_hashbucket);
1099                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1100                         continue;
1101                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1102                                         __get_free_pages(GFP_ATOMIC, order);
1103         } while (!sctp_assoc_hashtable && --order > 0);
1104         if (!sctp_assoc_hashtable) {
1105                 printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1106                 status = -ENOMEM;
1107                 goto err_ahash_alloc;
1108         }
1109         for (i = 0; i < sctp_assoc_hashsize; i++) {
1110                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1111                 sctp_assoc_hashtable[i].chain = NULL;
1112         }
1113
1114         /* Allocate and initialize the endpoint hash table.  */
1115         sctp_ep_hashsize = 64;
1116         sctp_ep_hashtable = (struct sctp_hashbucket *)
1117                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1118         if (!sctp_ep_hashtable) {
1119                 printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1120                 status = -ENOMEM;
1121                 goto err_ehash_alloc;
1122         }
1123         for (i = 0; i < sctp_ep_hashsize; i++) {
1124                 rwlock_init(&sctp_ep_hashtable[i].lock);
1125                 sctp_ep_hashtable[i].chain = NULL;
1126         }
1127
1128         /* Allocate and initialize the SCTP port hash table.  */
1129         do {
1130                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1131                                         sizeof(struct sctp_bind_hashbucket);
1132                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1133                         continue;
1134                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1135                                         __get_free_pages(GFP_ATOMIC, order);
1136         } while (!sctp_port_hashtable && --order > 0);
1137         if (!sctp_port_hashtable) {
1138                 printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1139                 status = -ENOMEM;
1140                 goto err_bhash_alloc;
1141         }
1142         for (i = 0; i < sctp_port_hashsize; i++) {
1143                 spin_lock_init(&sctp_port_hashtable[i].lock);
1144                 sctp_port_hashtable[i].chain = NULL;
1145         }
1146
1147         spin_lock_init(&sctp_port_alloc_lock);
1148         sctp_port_rover = sysctl_local_port_range[0] - 1;
1149
1150         printk(KERN_INFO "SCTP: Hash tables configured "
1151                          "(established %d bind %d)\n",
1152                 sctp_assoc_hashsize, sctp_port_hashsize);
1153
1154         /* Disable ADDIP by default. */
1155         sctp_addip_enable = 0;
1156
1157         /* Enable PR-SCTP by default. */
1158         sctp_prsctp_enable = 1;
1159
1160         sctp_sysctl_register();
1161
1162         INIT_LIST_HEAD(&sctp_address_families);
1163         sctp_register_af(&sctp_ipv4_specific);
1164
1165         status = proto_register(&sctp_prot, 1);
1166         if (status)
1167                 goto err_proto_register;
1168
1169         /* Register SCTP(UDP and TCP style) with socket layer.  */
1170         inet_register_protosw(&sctp_seqpacket_protosw);
1171         inet_register_protosw(&sctp_stream_protosw);
1172
1173         status = sctp_v6_init();
1174         if (status)
1175                 goto err_v6_init;
1176
1177         /* Initialize the control inode/socket for handling OOTB packets.  */
1178         if ((status = sctp_ctl_sock_init())) {
1179                 printk (KERN_ERR
1180                         "SCTP: Failed to initialize the SCTP control sock.\n");
1181                 goto err_ctl_sock_init;
1182         }
1183
1184         /* Initialize the local address list. */
1185         INIT_LIST_HEAD(&sctp_local_addr_list);
1186         spin_lock_init(&sctp_local_addr_lock);
1187         sctp_get_local_addr_list();
1188
1189         /* Register notifier for inet address additions/deletions. */
1190         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1191
1192         /* Register SCTP with inet layer.  */
1193         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0) {
1194                 status = -EAGAIN;
1195                 goto err_add_protocol;
1196         }
1197
1198         /* Register SCTP with inet6 layer.  */
1199         status = sctp_v6_add_protocol();
1200         if (status)
1201                 goto err_v6_add_protocol;
1202
1203         __unsafe(THIS_MODULE);
1204         status = 0;
1205 out:
1206         return status;
1207 err_v6_add_protocol:
1208         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1209         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1210 err_add_protocol:
1211         sctp_free_local_addr_list();
1212         sock_release(sctp_ctl_socket);
1213 err_ctl_sock_init:
1214         sctp_v6_exit();
1215 err_v6_init:
1216         inet_unregister_protosw(&sctp_stream_protosw);
1217         inet_unregister_protosw(&sctp_seqpacket_protosw);
1218         proto_unregister(&sctp_prot);
1219 err_proto_register:
1220         sctp_sysctl_unregister();
1221         list_del(&sctp_ipv4_specific.list);
1222         free_pages((unsigned long)sctp_port_hashtable,
1223                    get_order(sctp_port_hashsize *
1224                              sizeof(struct sctp_bind_hashbucket)));
1225 err_bhash_alloc:
1226         kfree(sctp_ep_hashtable);
1227 err_ehash_alloc:
1228         free_pages((unsigned long)sctp_assoc_hashtable,
1229                    get_order(sctp_assoc_hashsize *
1230                              sizeof(struct sctp_hashbucket)));
1231 err_ahash_alloc:
1232         sctp_dbg_objcnt_exit();
1233         sctp_proc_exit();
1234 err_init_proc:
1235         cleanup_sctp_mibs();
1236 err_init_mibs:
1237         kmem_cache_destroy(sctp_chunk_cachep);
1238 err_chunk_cachep:
1239         kmem_cache_destroy(sctp_bucket_cachep);
1240         goto out;
1241 }
1242
1243 /* Exit handler for the SCTP protocol.  */
1244 SCTP_STATIC __exit void sctp_exit(void)
1245 {
1246         /* BUG.  This should probably do something useful like clean
1247          * up all the remaining associations and all that memory.
1248          */
1249
1250         /* Unregister with inet6/inet layers. */
1251         sctp_v6_del_protocol();
1252         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1253
1254         /* Unregister notifier for inet address additions/deletions. */
1255         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1256
1257         /* Free the local address list.  */
1258         sctp_free_local_addr_list();
1259
1260         /* Free the control endpoint.  */
1261         sock_release(sctp_ctl_socket);
1262
1263         /* Cleanup v6 initializations. */
1264         sctp_v6_exit();
1265
1266         /* Unregister with socket layer. */
1267         inet_unregister_protosw(&sctp_stream_protosw);
1268         inet_unregister_protosw(&sctp_seqpacket_protosw);
1269
1270         sctp_sysctl_unregister();
1271         list_del(&sctp_ipv4_specific.list);
1272
1273         free_pages((unsigned long)sctp_assoc_hashtable,
1274                    get_order(sctp_assoc_hashsize *
1275                              sizeof(struct sctp_hashbucket)));
1276         kfree(sctp_ep_hashtable);
1277         free_pages((unsigned long)sctp_port_hashtable,
1278                    get_order(sctp_port_hashsize *
1279                              sizeof(struct sctp_bind_hashbucket)));
1280
1281         sctp_dbg_objcnt_exit();
1282         sctp_proc_exit();
1283         cleanup_sctp_mibs();
1284
1285         kmem_cache_destroy(sctp_chunk_cachep);
1286         kmem_cache_destroy(sctp_bucket_cachep);
1287
1288         proto_unregister(&sctp_prot);
1289 }
1290
1291 module_init(sctp_init);
1292 module_exit(sctp_exit);
1293
1294 /*
1295  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1296  */
1297 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1298 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1299 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1300 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1301 MODULE_LICENSE("GPL");