linux/net/sctp/protocol.c
<<
>>
Prefs
   1/* SCTP kernel 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 implementation
  10 *
  11 * Initialization/cleanup for SCTP protocol support.
  12 *
  13 * This SCTP 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 * This SCTP 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 <linux/bootmem.h>
  55#include <linux/highmem.h>
  56#include <linux/swap.h>
  57#include <net/net_namespace.h>
  58#include <net/protocol.h>
  59#include <net/ip.h>
  60#include <net/ipv6.h>
  61#include <net/route.h>
  62#include <net/sctp/sctp.h>
  63#include <net/addrconf.h>
  64#include <net/inet_common.h>
  65#include <net/inet_ecn.h>
  66
  67/* Global data structures. */
  68struct sctp_globals sctp_globals __read_mostly;
  69DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
  70
  71#ifdef CONFIG_PROC_FS
  72struct proc_dir_entry   *proc_net_sctp;
  73#endif
  74
  75struct idr sctp_assocs_id;
  76DEFINE_SPINLOCK(sctp_assocs_id_lock);
  77
  78/* This is the global socket data structure used for responding to
  79 * the Out-of-the-blue (OOTB) packets.  A control sock will be created
  80 * for this socket at the initialization time.
  81 */
  82static struct sock *sctp_ctl_sock;
  83
  84static struct sctp_pf *sctp_pf_inet6_specific;
  85static struct sctp_pf *sctp_pf_inet_specific;
  86static struct sctp_af *sctp_af_v4_specific;
  87static struct sctp_af *sctp_af_v6_specific;
  88
  89struct kmem_cache *sctp_chunk_cachep __read_mostly;
  90struct kmem_cache *sctp_bucket_cachep __read_mostly;
  91
  92int sysctl_sctp_mem[3];
  93int sysctl_sctp_rmem[3];
  94int sysctl_sctp_wmem[3];
  95
  96/* Return the address of the control sock. */
  97struct sock *sctp_get_ctl_sock(void)
  98{
  99        return sctp_ctl_sock;
 100}
 101
 102/* Set up the proc fs entry for the SCTP protocol. */
 103static __init int sctp_proc_init(void)
 104{
 105        if (percpu_counter_init(&sctp_sockets_allocated, 0))
 106                goto out_nomem;
 107#ifdef CONFIG_PROC_FS
 108        if (!proc_net_sctp) {
 109                proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
 110                if (!proc_net_sctp)
 111                        goto out_free_percpu;
 112        }
 113
 114        if (sctp_snmp_proc_init())
 115                goto out_snmp_proc_init;
 116        if (sctp_eps_proc_init())
 117                goto out_eps_proc_init;
 118        if (sctp_assocs_proc_init())
 119                goto out_assocs_proc_init;
 120        if (sctp_remaddr_proc_init())
 121                goto out_remaddr_proc_init;
 122
 123        return 0;
 124
 125out_remaddr_proc_init:
 126        sctp_assocs_proc_exit();
 127out_assocs_proc_init:
 128        sctp_eps_proc_exit();
 129out_eps_proc_init:
 130        sctp_snmp_proc_exit();
 131out_snmp_proc_init:
 132        if (proc_net_sctp) {
 133                proc_net_sctp = NULL;
 134                remove_proc_entry("sctp", init_net.proc_net);
 135        }
 136out_free_percpu:
 137        percpu_counter_destroy(&sctp_sockets_allocated);
 138#else
 139        return 0;
 140#endif /* CONFIG_PROC_FS */
 141
 142out_nomem:
 143        return -ENOMEM;
 144}
 145
 146/* Clean up the proc fs entry for the SCTP protocol.
 147 * Note: Do not make this __exit as it is used in the init error
 148 * path.
 149 */
 150static void sctp_proc_exit(void)
 151{
 152#ifdef CONFIG_PROC_FS
 153        sctp_snmp_proc_exit();
 154        sctp_eps_proc_exit();
 155        sctp_assocs_proc_exit();
 156        sctp_remaddr_proc_exit();
 157
 158        if (proc_net_sctp) {
 159                proc_net_sctp = NULL;
 160                remove_proc_entry("sctp", init_net.proc_net);
 161        }
 162#endif
 163}
 164
 165/* Private helper to extract ipv4 address and stash them in
 166 * the protocol structure.
 167 */
 168static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 169                                  struct net_device *dev)
 170{
 171        struct in_device *in_dev;
 172        struct in_ifaddr *ifa;
 173        struct sctp_sockaddr_entry *addr;
 174
 175        rcu_read_lock();
 176        if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 177                rcu_read_unlock();
 178                return;
 179        }
 180
 181        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 182                /* Add the address to the local list.  */
 183                addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 184                if (addr) {
 185                        addr->a.v4.sin_family = AF_INET;
 186                        addr->a.v4.sin_port = 0;
 187                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 188                        addr->valid = 1;
 189                        INIT_LIST_HEAD(&addr->list);
 190                        INIT_RCU_HEAD(&addr->rcu);
 191                        list_add_tail(&addr->list, addrlist);
 192                }
 193        }
 194
 195        rcu_read_unlock();
 196}
 197
 198/* Extract our IP addresses from the system and stash them in the
 199 * protocol structure.
 200 */
 201static void sctp_get_local_addr_list(void)
 202{
 203        struct net_device *dev;
 204        struct list_head *pos;
 205        struct sctp_af *af;
 206
 207        read_lock(&dev_base_lock);
 208        for_each_netdev(&init_net, dev) {
 209                __list_for_each(pos, &sctp_address_families) {
 210                        af = list_entry(pos, struct sctp_af, list);
 211                        af->copy_addrlist(&sctp_local_addr_list, dev);
 212                }
 213        }
 214        read_unlock(&dev_base_lock);
 215}
 216
 217/* Free the existing local addresses.  */
 218static void sctp_free_local_addr_list(void)
 219{
 220        struct sctp_sockaddr_entry *addr;
 221        struct list_head *pos, *temp;
 222
 223        list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 224                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 225                list_del(pos);
 226                kfree(addr);
 227        }
 228}
 229
 230void sctp_local_addr_free(struct rcu_head *head)
 231{
 232        struct sctp_sockaddr_entry *e = container_of(head,
 233                                struct sctp_sockaddr_entry, rcu);
 234        kfree(e);
 235}
 236
 237/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 238int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 239                              gfp_t gfp, int copy_flags)
 240{
 241        struct sctp_sockaddr_entry *addr;
 242        int error = 0;
 243
 244        rcu_read_lock();
 245        list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
 246                if (!addr->valid)
 247                        continue;
 248                if (sctp_in_scope(&addr->a, scope)) {
 249                        /* Now that the address is in scope, check to see if
 250                         * the address type is really supported by the local
 251                         * sock as well as the remote peer.
 252                         */
 253                        if ((((AF_INET == addr->a.sa.sa_family) &&
 254                              (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 255                            (((AF_INET6 == addr->a.sa.sa_family) &&
 256                              (copy_flags & SCTP_ADDR6_ALLOWED) &&
 257                              (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 258                                error = sctp_add_bind_addr(bp, &addr->a,
 259                                                    SCTP_ADDR_SRC, GFP_ATOMIC);
 260                                if (error)
 261                                        goto end_copy;
 262                        }
 263                }
 264        }
 265
 266end_copy:
 267        rcu_read_unlock();
 268        return error;
 269}
 270
 271/* Initialize a sctp_addr from in incoming skb.  */
 272static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 273                             int is_saddr)
 274{
 275        void *from;
 276        __be16 *port;
 277        struct sctphdr *sh;
 278
 279        port = &addr->v4.sin_port;
 280        addr->v4.sin_family = AF_INET;
 281
 282        sh = sctp_hdr(skb);
 283        if (is_saddr) {
 284                *port  = sh->source;
 285                from = &ip_hdr(skb)->saddr;
 286        } else {
 287                *port = sh->dest;
 288                from = &ip_hdr(skb)->daddr;
 289        }
 290        memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 291}
 292
 293/* Initialize an sctp_addr from a socket. */
 294static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 295{
 296        addr->v4.sin_family = AF_INET;
 297        addr->v4.sin_port = 0;
 298        addr->v4.sin_addr.s_addr = inet_sk(sk)->rcv_saddr;
 299}
 300
 301/* Initialize sk->sk_rcv_saddr from sctp_addr. */
 302static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 303{
 304        inet_sk(sk)->rcv_saddr = addr->v4.sin_addr.s_addr;
 305}
 306
 307/* Initialize sk->sk_daddr from sctp_addr. */
 308static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 309{
 310        inet_sk(sk)->daddr = addr->v4.sin_addr.s_addr;
 311}
 312
 313/* Initialize a sctp_addr from an address parameter. */
 314static void sctp_v4_from_addr_param(union sctp_addr *addr,
 315                                    union sctp_addr_param *param,
 316                                    __be16 port, int iif)
 317{
 318        addr->v4.sin_family = AF_INET;
 319        addr->v4.sin_port = port;
 320        addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 321}
 322
 323/* Initialize an address parameter from a sctp_addr and return the length
 324 * of the address parameter.
 325 */
 326static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 327                                 union sctp_addr_param *param)
 328{
 329        int length = sizeof(sctp_ipv4addr_param_t);
 330
 331        param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 332        param->v4.param_hdr.length = htons(length);
 333        param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 334
 335        return length;
 336}
 337
 338/* Initialize a sctp_addr from a dst_entry. */
 339static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
 340                              __be16 port)
 341{
 342        struct rtable *rt = (struct rtable *)dst;
 343        saddr->v4.sin_family = AF_INET;
 344        saddr->v4.sin_port = port;
 345        saddr->v4.sin_addr.s_addr = rt->rt_src;
 346}
 347
 348/* Compare two addresses exactly. */
 349static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 350                            const union sctp_addr *addr2)
 351{
 352        if (addr1->sa.sa_family != addr2->sa.sa_family)
 353                return 0;
 354        if (addr1->v4.sin_port != addr2->v4.sin_port)
 355                return 0;
 356        if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 357                return 0;
 358
 359        return 1;
 360}
 361
 362/* Initialize addr struct to INADDR_ANY. */
 363static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 364{
 365        addr->v4.sin_family = AF_INET;
 366        addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 367        addr->v4.sin_port = port;
 368}
 369
 370/* Is this a wildcard address? */
 371static int sctp_v4_is_any(const union sctp_addr *addr)
 372{
 373        return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 374}
 375
 376/* This function checks if the address is a valid address to be used for
 377 * SCTP binding.
 378 *
 379 * Output:
 380 * Return 0 - If the address is a non-unicast or an illegal address.
 381 * Return 1 - If the address is a unicast.
 382 */
 383static int sctp_v4_addr_valid(union sctp_addr *addr,
 384                              struct sctp_sock *sp,
 385                              const struct sk_buff *skb)
 386{
 387        /* IPv4 addresses not allowed */
 388        if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 389                return 0;
 390
 391        /* Is this a non-unicast address or a unusable SCTP address? */
 392        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 393                return 0;
 394
 395        /* Is this a broadcast address? */
 396        if (skb && skb->rtable->rt_flags & RTCF_BROADCAST)
 397                return 0;
 398
 399        return 1;
 400}
 401
 402/* Should this be available for binding?   */
 403static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 404{
 405        int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
 406
 407
 408        if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 409           ret != RTN_LOCAL &&
 410           !sp->inet.freebind &&
 411           !sysctl_ip_nonlocal_bind)
 412                return 0;
 413
 414        if (ipv6_only_sock(sctp_opt2sk(sp)))
 415                return 0;
 416
 417        return 1;
 418}
 419
 420/* Checking the loopback, private and other address scopes as defined in
 421 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 422 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 423 *
 424 * Level 0 - unusable SCTP addresses
 425 * Level 1 - loopback address
 426 * Level 2 - link-local addresses
 427 * Level 3 - private addresses.
 428 * Level 4 - global addresses
 429 * For INIT and INIT-ACK address list, let L be the level of
 430 * of requested destination address, sender and receiver
 431 * SHOULD include all of its addresses with level greater
 432 * than or equal to L.
 433 */
 434static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 435{
 436        sctp_scope_t retval;
 437
 438        /* Should IPv4 scoping be a sysctl configurable option
 439         * so users can turn it off (default on) for certain
 440         * unconventional networking environments?
 441         */
 442
 443        /* Check for unusable SCTP addresses. */
 444        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 445                retval =  SCTP_SCOPE_UNUSABLE;
 446        } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 447                retval = SCTP_SCOPE_LOOPBACK;
 448        } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 449                retval = SCTP_SCOPE_LINK;
 450        } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 451                   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 452                   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 453                retval = SCTP_SCOPE_PRIVATE;
 454        } else {
 455                retval = SCTP_SCOPE_GLOBAL;
 456        }
 457
 458        return retval;
 459}
 460
 461/* Returns a valid dst cache entry for the given source and destination ip
 462 * addresses. If an association is passed, trys to get a dst entry with a
 463 * source address that matches an address in the bind address list.
 464 */
 465static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
 466                                         union sctp_addr *daddr,
 467                                         union sctp_addr *saddr)
 468{
 469        struct rtable *rt;
 470        struct flowi fl;
 471        struct sctp_bind_addr *bp;
 472        struct sctp_sockaddr_entry *laddr;
 473        struct dst_entry *dst = NULL;
 474        union sctp_addr dst_saddr;
 475
 476        memset(&fl, 0x0, sizeof(struct flowi));
 477        fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 478        fl.proto = IPPROTO_SCTP;
 479        if (asoc) {
 480                fl.fl4_tos = RT_CONN_FLAGS(asoc->base.sk);
 481                fl.oif = asoc->base.sk->sk_bound_dev_if;
 482        }
 483        if (saddr)
 484                fl.fl4_src = saddr->v4.sin_addr.s_addr;
 485
 486        SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
 487                          __func__, &fl.fl4_dst, &fl.fl4_src);
 488
 489        if (!ip_route_output_key(&init_net, &rt, &fl)) {
 490                dst = &rt->u.dst;
 491        }
 492
 493        /* If there is no association or if a source address is passed, no
 494         * more validation is required.
 495         */
 496        if (!asoc || saddr)
 497                goto out;
 498
 499        bp = &asoc->base.bind_addr;
 500
 501        if (dst) {
 502                /* Walk through the bind address list and look for a bind
 503                 * address that matches the source address of the returned dst.
 504                 */
 505                sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 506                rcu_read_lock();
 507                list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 508                        if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
 509                                continue;
 510                        if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 511                                goto out_unlock;
 512                }
 513                rcu_read_unlock();
 514
 515                /* None of the bound addresses match the source address of the
 516                 * dst. So release it.
 517                 */
 518                dst_release(dst);
 519                dst = NULL;
 520        }
 521
 522        /* Walk through the bind address list and try to get a dst that
 523         * matches a bind address as the source address.
 524         */
 525        rcu_read_lock();
 526        list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 527                if (!laddr->valid)
 528                        continue;
 529                if ((laddr->state == SCTP_ADDR_SRC) &&
 530                    (AF_INET == laddr->a.sa.sa_family)) {
 531                        fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
 532                        if (!ip_route_output_key(&init_net, &rt, &fl)) {
 533                                dst = &rt->u.dst;
 534                                goto out_unlock;
 535                        }
 536                }
 537        }
 538
 539out_unlock:
 540        rcu_read_unlock();
 541out:
 542        if (dst)
 543                SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
 544                                  &rt->rt_dst, &rt->rt_src);
 545        else
 546                SCTP_DEBUG_PRINTK("NO ROUTE\n");
 547
 548        return dst;
 549}
 550
 551/* For v4, the source address is cached in the route entry(dst). So no need
 552 * to cache it separately and hence this is an empty routine.
 553 */
 554static void sctp_v4_get_saddr(struct sctp_sock *sk,
 555                              struct sctp_association *asoc,
 556                              struct dst_entry *dst,
 557                              union sctp_addr *daddr,
 558                              union sctp_addr *saddr)
 559{
 560        struct rtable *rt = (struct rtable *)dst;
 561
 562        if (!asoc)
 563                return;
 564
 565        if (rt) {
 566                saddr->v4.sin_family = AF_INET;
 567                saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 568                saddr->v4.sin_addr.s_addr = rt->rt_src;
 569        }
 570}
 571
 572/* What interface did this skb arrive on? */
 573static int sctp_v4_skb_iif(const struct sk_buff *skb)
 574{
 575        return skb->rtable->rt_iif;
 576}
 577
 578/* Was this packet marked by Explicit Congestion Notification? */
 579static int sctp_v4_is_ce(const struct sk_buff *skb)
 580{
 581        return INET_ECN_is_ce(ip_hdr(skb)->tos);
 582}
 583
 584/* Create and initialize a new sk for the socket returned by accept(). */
 585static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 586                                             struct sctp_association *asoc)
 587{
 588        struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 589                        sk->sk_prot);
 590        struct inet_sock *newinet;
 591
 592        if (!newsk)
 593                goto out;
 594
 595        sock_init_data(NULL, newsk);
 596
 597        sctp_copy_sock(newsk, sk, asoc);
 598        sock_reset_flag(newsk, SOCK_ZAPPED);
 599
 600        newinet = inet_sk(newsk);
 601
 602        newinet->daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 603
 604        sk_refcnt_debug_inc(newsk);
 605
 606        if (newsk->sk_prot->init(newsk)) {
 607                sk_common_release(newsk);
 608                newsk = NULL;
 609        }
 610
 611out:
 612        return newsk;
 613}
 614
 615/* Map address, empty for v4 family */
 616static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 617{
 618        /* Empty */
 619}
 620
 621/* Dump the v4 addr to the seq file. */
 622static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 623{
 624        seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 625}
 626
 627static void sctp_v4_ecn_capable(struct sock *sk)
 628{
 629        INET_ECN_xmit(sk);
 630}
 631
 632/* Event handler for inet address addition/deletion events.
 633 * The sctp_local_addr_list needs to be protocted by a spin lock since
 634 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 635 * time and thus corrupt the list.
 636 * The reader side is protected with RCU.
 637 */
 638static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 639                               void *ptr)
 640{
 641        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 642        struct sctp_sockaddr_entry *addr = NULL;
 643        struct sctp_sockaddr_entry *temp;
 644        int found = 0;
 645
 646        if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
 647                return NOTIFY_DONE;
 648
 649        switch (ev) {
 650        case NETDEV_UP:
 651                addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 652                if (addr) {
 653                        addr->a.v4.sin_family = AF_INET;
 654                        addr->a.v4.sin_port = 0;
 655                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 656                        addr->valid = 1;
 657                        spin_lock_bh(&sctp_local_addr_lock);
 658                        list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 659                        spin_unlock_bh(&sctp_local_addr_lock);
 660                }
 661                break;
 662        case NETDEV_DOWN:
 663                spin_lock_bh(&sctp_local_addr_lock);
 664                list_for_each_entry_safe(addr, temp,
 665                                        &sctp_local_addr_list, list) {
 666                        if (addr->a.sa.sa_family == AF_INET &&
 667                                        addr->a.v4.sin_addr.s_addr ==
 668                                        ifa->ifa_local) {
 669                                found = 1;
 670                                addr->valid = 0;
 671                                list_del_rcu(&addr->list);
 672                                break;
 673                        }
 674                }
 675                spin_unlock_bh(&sctp_local_addr_lock);
 676                if (found)
 677                        call_rcu(&addr->rcu, sctp_local_addr_free);
 678                break;
 679        }
 680
 681        return NOTIFY_DONE;
 682}
 683
 684/*
 685 * Initialize the control inode/socket with a control endpoint data
 686 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 687 */
 688static int sctp_ctl_sock_init(void)
 689{
 690        int err;
 691        sa_family_t family = PF_INET;
 692
 693        if (sctp_get_pf_specific(PF_INET6))
 694                family = PF_INET6;
 695
 696        err = inet_ctl_sock_create(&sctp_ctl_sock, family,
 697                                   SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
 698
 699        /* If IPv6 socket could not be created, try the IPv4 socket */
 700        if (err < 0 && family == PF_INET6)
 701                err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
 702                                           SOCK_SEQPACKET, IPPROTO_SCTP,
 703                                           &init_net);
 704
 705        if (err < 0) {
 706                printk(KERN_ERR
 707                       "SCTP: Failed to create the SCTP control socket.\n");
 708                return err;
 709        }
 710        return 0;
 711}
 712
 713/* Register address family specific functions. */
 714int sctp_register_af(struct sctp_af *af)
 715{
 716        switch (af->sa_family) {
 717        case AF_INET:
 718                if (sctp_af_v4_specific)
 719                        return 0;
 720                sctp_af_v4_specific = af;
 721                break;
 722        case AF_INET6:
 723                if (sctp_af_v6_specific)
 724                        return 0;
 725                sctp_af_v6_specific = af;
 726                break;
 727        default:
 728                return 0;
 729        }
 730
 731        INIT_LIST_HEAD(&af->list);
 732        list_add_tail(&af->list, &sctp_address_families);
 733        return 1;
 734}
 735
 736/* Get the table of functions for manipulating a particular address
 737 * family.
 738 */
 739struct sctp_af *sctp_get_af_specific(sa_family_t family)
 740{
 741        switch (family) {
 742        case AF_INET:
 743                return sctp_af_v4_specific;
 744        case AF_INET6:
 745                return sctp_af_v6_specific;
 746        default:
 747                return NULL;
 748        }
 749}
 750
 751/* Common code to initialize a AF_INET msg_name. */
 752static void sctp_inet_msgname(char *msgname, int *addr_len)
 753{
 754        struct sockaddr_in *sin;
 755
 756        sin = (struct sockaddr_in *)msgname;
 757        *addr_len = sizeof(struct sockaddr_in);
 758        sin->sin_family = AF_INET;
 759        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 760}
 761
 762/* Copy the primary address of the peer primary address as the msg_name. */
 763static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 764                                    int *addr_len)
 765{
 766        struct sockaddr_in *sin, *sinfrom;
 767
 768        if (msgname) {
 769                struct sctp_association *asoc;
 770
 771                asoc = event->asoc;
 772                sctp_inet_msgname(msgname, addr_len);
 773                sin = (struct sockaddr_in *)msgname;
 774                sinfrom = &asoc->peer.primary_addr.v4;
 775                sin->sin_port = htons(asoc->peer.port);
 776                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 777        }
 778}
 779
 780/* Initialize and copy out a msgname from an inbound skb. */
 781static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 782{
 783        if (msgname) {
 784                struct sctphdr *sh = sctp_hdr(skb);
 785                struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 786
 787                sctp_inet_msgname(msgname, len);
 788                sin->sin_port = sh->source;
 789                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 790        }
 791}
 792
 793/* Do we support this AF? */
 794static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 795{
 796        /* PF_INET only supports AF_INET addresses. */
 797        return (AF_INET == family);
 798}
 799
 800/* Address matching with wildcards allowed. */
 801static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 802                              const union sctp_addr *addr2,
 803                              struct sctp_sock *opt)
 804{
 805        /* PF_INET only supports AF_INET addresses. */
 806        if (addr1->sa.sa_family != addr2->sa.sa_family)
 807                return 0;
 808        if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 809            htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 810                return 1;
 811        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 812                return 1;
 813
 814        return 0;
 815}
 816
 817/* Verify that provided sockaddr looks bindable.  Common verification has
 818 * already been taken care of.
 819 */
 820static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 821{
 822        return sctp_v4_available(addr, opt);
 823}
 824
 825/* Verify that sockaddr looks sendable.  Common verification has already
 826 * been taken care of.
 827 */
 828static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 829{
 830        return 1;
 831}
 832
 833/* Fill in Supported Address Type information for INIT and INIT-ACK
 834 * chunks.  Returns number of addresses supported.
 835 */
 836static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 837                                     __be16 *types)
 838{
 839        types[0] = SCTP_PARAM_IPV4_ADDRESS;
 840        return 1;
 841}
 842
 843/* Wrapper routine that calls the ip transmit routine. */
 844static inline int sctp_v4_xmit(struct sk_buff *skb,
 845                               struct sctp_transport *transport)
 846{
 847        struct inet_sock *inet = inet_sk(skb->sk);
 848
 849        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 850                          __func__, skb, skb->len,
 851                          &skb->rtable->rt_src,
 852                          &skb->rtable->rt_dst);
 853
 854        inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 855                         IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 856
 857        SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 858        return ip_queue_xmit(skb, 0);
 859}
 860
 861static struct sctp_af sctp_af_inet;
 862
 863static struct sctp_pf sctp_pf_inet = {
 864        .event_msgname = sctp_inet_event_msgname,
 865        .skb_msgname   = sctp_inet_skb_msgname,
 866        .af_supported  = sctp_inet_af_supported,
 867        .cmp_addr      = sctp_inet_cmp_addr,
 868        .bind_verify   = sctp_inet_bind_verify,
 869        .send_verify   = sctp_inet_send_verify,
 870        .supported_addrs = sctp_inet_supported_addrs,
 871        .create_accept_sk = sctp_v4_create_accept_sk,
 872        .addr_v4map     = sctp_v4_addr_v4map,
 873        .af            = &sctp_af_inet
 874};
 875
 876/* Notifier for inetaddr addition/deletion events.  */
 877static struct notifier_block sctp_inetaddr_notifier = {
 878        .notifier_call = sctp_inetaddr_event,
 879};
 880
 881/* Socket operations.  */
 882static const struct proto_ops inet_seqpacket_ops = {
 883        .family            = PF_INET,
 884        .owner             = THIS_MODULE,
 885        .release           = inet_release,      /* Needs to be wrapped... */
 886        .bind              = inet_bind,
 887        .connect           = inet_dgram_connect,
 888        .socketpair        = sock_no_socketpair,
 889        .accept            = inet_accept,
 890        .getname           = inet_getname,      /* Semantics are different.  */
 891        .poll              = sctp_poll,
 892        .ioctl             = inet_ioctl,
 893        .listen            = sctp_inet_listen,
 894        .shutdown          = inet_shutdown,     /* Looks harmless.  */
 895        .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 896        .getsockopt        = sock_common_getsockopt,
 897        .sendmsg           = inet_sendmsg,
 898        .recvmsg           = sock_common_recvmsg,
 899        .mmap              = sock_no_mmap,
 900        .sendpage          = sock_no_sendpage,
 901#ifdef CONFIG_COMPAT
 902        .compat_setsockopt = compat_sock_common_setsockopt,
 903        .compat_getsockopt = compat_sock_common_getsockopt,
 904#endif
 905};
 906
 907/* Registration with AF_INET family.  */
 908static struct inet_protosw sctp_seqpacket_protosw = {
 909        .type       = SOCK_SEQPACKET,
 910        .protocol   = IPPROTO_SCTP,
 911        .prot       = &sctp_prot,
 912        .ops        = &inet_seqpacket_ops,
 913        .capability = -1,
 914        .no_check   = 0,
 915        .flags      = SCTP_PROTOSW_FLAG
 916};
 917static struct inet_protosw sctp_stream_protosw = {
 918        .type       = SOCK_STREAM,
 919        .protocol   = IPPROTO_SCTP,
 920        .prot       = &sctp_prot,
 921        .ops        = &inet_seqpacket_ops,
 922        .capability = -1,
 923        .no_check   = 0,
 924        .flags      = SCTP_PROTOSW_FLAG
 925};
 926
 927/* Register with IP layer.  */
 928static struct net_protocol sctp_protocol = {
 929        .handler     = sctp_rcv,
 930        .err_handler = sctp_v4_err,
 931        .no_policy   = 1,
 932};
 933
 934/* IPv4 address related functions.  */
 935static struct sctp_af sctp_af_inet = {
 936        .sa_family         = AF_INET,
 937        .sctp_xmit         = sctp_v4_xmit,
 938        .setsockopt        = ip_setsockopt,
 939        .getsockopt        = ip_getsockopt,
 940        .get_dst           = sctp_v4_get_dst,
 941        .get_saddr         = sctp_v4_get_saddr,
 942        .copy_addrlist     = sctp_v4_copy_addrlist,
 943        .from_skb          = sctp_v4_from_skb,
 944        .from_sk           = sctp_v4_from_sk,
 945        .to_sk_saddr       = sctp_v4_to_sk_saddr,
 946        .to_sk_daddr       = sctp_v4_to_sk_daddr,
 947        .from_addr_param   = sctp_v4_from_addr_param,
 948        .to_addr_param     = sctp_v4_to_addr_param,
 949        .dst_saddr         = sctp_v4_dst_saddr,
 950        .cmp_addr          = sctp_v4_cmp_addr,
 951        .addr_valid        = sctp_v4_addr_valid,
 952        .inaddr_any        = sctp_v4_inaddr_any,
 953        .is_any            = sctp_v4_is_any,
 954        .available         = sctp_v4_available,
 955        .scope             = sctp_v4_scope,
 956        .skb_iif           = sctp_v4_skb_iif,
 957        .is_ce             = sctp_v4_is_ce,
 958        .seq_dump_addr     = sctp_v4_seq_dump_addr,
 959        .ecn_capable       = sctp_v4_ecn_capable,
 960        .net_header_len    = sizeof(struct iphdr),
 961        .sockaddr_len      = sizeof(struct sockaddr_in),
 962#ifdef CONFIG_COMPAT
 963        .compat_setsockopt = compat_ip_setsockopt,
 964        .compat_getsockopt = compat_ip_getsockopt,
 965#endif
 966};
 967
 968struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 969
 970        switch (family) {
 971        case PF_INET:
 972                return sctp_pf_inet_specific;
 973        case PF_INET6:
 974                return sctp_pf_inet6_specific;
 975        default:
 976                return NULL;
 977        }
 978}
 979
 980/* Register the PF specific function table.  */
 981int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 982{
 983        switch (family) {
 984        case PF_INET:
 985                if (sctp_pf_inet_specific)
 986                        return 0;
 987                sctp_pf_inet_specific = pf;
 988                break;
 989        case PF_INET6:
 990                if (sctp_pf_inet6_specific)
 991                        return 0;
 992                sctp_pf_inet6_specific = pf;
 993                break;
 994        default:
 995                return 0;
 996        }
 997        return 1;
 998}
 999
1000static inline int init_sctp_mibs(void)
1001{
1002        return snmp_mib_init((void**)sctp_statistics, sizeof(struct sctp_mib));
1003}
1004
1005static inline void cleanup_sctp_mibs(void)
1006{
1007        snmp_mib_free((void**)sctp_statistics);
1008}
1009
1010static void sctp_v4_pf_init(void)
1011{
1012        /* Initialize the SCTP specific PF functions. */
1013        sctp_register_pf(&sctp_pf_inet, PF_INET);
1014        sctp_register_af(&sctp_af_inet);
1015}
1016
1017static void sctp_v4_pf_exit(void)
1018{
1019        list_del(&sctp_af_inet.list);
1020}
1021
1022static int sctp_v4_protosw_init(void)
1023{
1024        int rc;
1025
1026        rc = proto_register(&sctp_prot, 1);
1027        if (rc)
1028                return rc;
1029
1030        /* Register SCTP(UDP and TCP style) with socket layer.  */
1031        inet_register_protosw(&sctp_seqpacket_protosw);
1032        inet_register_protosw(&sctp_stream_protosw);
1033
1034        return 0;
1035}
1036
1037static void sctp_v4_protosw_exit(void)
1038{
1039        inet_unregister_protosw(&sctp_stream_protosw);
1040        inet_unregister_protosw(&sctp_seqpacket_protosw);
1041        proto_unregister(&sctp_prot);
1042}
1043
1044static int sctp_v4_add_protocol(void)
1045{
1046        /* Register notifier for inet address additions/deletions. */
1047        register_inetaddr_notifier(&sctp_inetaddr_notifier);
1048
1049        /* Register SCTP with inet layer.  */
1050        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1051                return -EAGAIN;
1052
1053        return 0;
1054}
1055
1056static void sctp_v4_del_protocol(void)
1057{
1058        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1059        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1060}
1061
1062/* Initialize the universe into something sensible.  */
1063SCTP_STATIC __init int sctp_init(void)
1064{
1065        int i;
1066        int status = -EINVAL;
1067        unsigned long goal;
1068        unsigned long limit;
1069        unsigned long nr_pages;
1070        int max_share;
1071        int order;
1072
1073        /* SCTP_DEBUG sanity check. */
1074        if (!sctp_sanity_check())
1075                goto out;
1076
1077        /* Allocate bind_bucket and chunk caches. */
1078        status = -ENOBUFS;
1079        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1080                                               sizeof(struct sctp_bind_bucket),
1081                                               0, SLAB_HWCACHE_ALIGN,
1082                                               NULL);
1083        if (!sctp_bucket_cachep)
1084                goto out;
1085
1086        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1087                                               sizeof(struct sctp_chunk),
1088                                               0, SLAB_HWCACHE_ALIGN,
1089                                               NULL);
1090        if (!sctp_chunk_cachep)
1091                goto err_chunk_cachep;
1092
1093        /* Allocate and initialise sctp mibs.  */
1094        status = init_sctp_mibs();
1095        if (status)
1096                goto err_init_mibs;
1097
1098        /* Initialize proc fs directory.  */
1099        status = sctp_proc_init();
1100        if (status)
1101                goto err_init_proc;
1102
1103        /* Initialize object count debugging.  */
1104        sctp_dbg_objcnt_init();
1105
1106        /*
1107         * 14. Suggested SCTP Protocol Parameter Values
1108         */
1109        /* The following protocol parameters are RECOMMENDED:  */
1110        /* RTO.Initial              - 3  seconds */
1111        sctp_rto_initial                = SCTP_RTO_INITIAL;
1112        /* RTO.Min                  - 1  second */
1113        sctp_rto_min                    = SCTP_RTO_MIN;
1114        /* RTO.Max                 -  60 seconds */
1115        sctp_rto_max                    = SCTP_RTO_MAX;
1116        /* RTO.Alpha                - 1/8 */
1117        sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1118        /* RTO.Beta                 - 1/4 */
1119        sctp_rto_beta                   = SCTP_RTO_BETA;
1120
1121        /* Valid.Cookie.Life        - 60  seconds */
1122        sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1123
1124        /* Whether Cookie Preservative is enabled(1) or not(0) */
1125        sctp_cookie_preserve_enable     = 1;
1126
1127        /* Max.Burst                - 4 */
1128        sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1129
1130        /* Association.Max.Retrans  - 10 attempts
1131         * Path.Max.Retrans         - 5  attempts (per destination address)
1132         * Max.Init.Retransmits     - 8  attempts
1133         */
1134        sctp_max_retrans_association    = 10;
1135        sctp_max_retrans_path           = 5;
1136        sctp_max_retrans_init           = 8;
1137
1138        /* Sendbuffer growth        - do per-socket accounting */
1139        sctp_sndbuf_policy              = 0;
1140
1141        /* Rcvbuffer growth         - do per-socket accounting */
1142        sctp_rcvbuf_policy              = 0;
1143
1144        /* HB.interval              - 30 seconds */
1145        sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1146
1147        /* delayed SACK timeout */
1148        sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1149
1150        /* Implementation specific variables. */
1151
1152        /* Initialize default stream count setup information. */
1153        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1154        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1155
1156        /* Initialize handle used for association ids. */
1157        idr_init(&sctp_assocs_id);
1158
1159        /* Set the pressure threshold to be a fraction of global memory that
1160         * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1161         * memory, with a floor of 128 pages.
1162         * Note this initalizes the data in sctpv6_prot too
1163         * Unabashedly stolen from tcp_init
1164         */
1165        nr_pages = totalram_pages - totalhigh_pages;
1166        limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1167        limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1168        limit = max(limit, 128UL);
1169        sysctl_sctp_mem[0] = limit / 4 * 3;
1170        sysctl_sctp_mem[1] = limit;
1171        sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1172
1173        /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1174        limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1175        max_share = min(4UL*1024*1024, limit);
1176
1177        sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1178        sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1179        sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1180
1181        sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1182        sysctl_sctp_wmem[1] = 16*1024;
1183        sysctl_sctp_wmem[2] = max(64*1024, max_share);
1184
1185        /* Size and allocate the association hash table.
1186         * The methodology is similar to that of the tcp hash tables.
1187         */
1188        if (num_physpages >= (128 * 1024))
1189                goal = num_physpages >> (22 - PAGE_SHIFT);
1190        else
1191                goal = num_physpages >> (24 - PAGE_SHIFT);
1192
1193        for (order = 0; (1UL << order) < goal; order++)
1194                ;
1195
1196        do {
1197                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1198                                        sizeof(struct sctp_hashbucket);
1199                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1200                        continue;
1201                sctp_assoc_hashtable = (struct sctp_hashbucket *)
1202                                        __get_free_pages(GFP_ATOMIC, order);
1203        } while (!sctp_assoc_hashtable && --order > 0);
1204        if (!sctp_assoc_hashtable) {
1205                printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1206                status = -ENOMEM;
1207                goto err_ahash_alloc;
1208        }
1209        for (i = 0; i < sctp_assoc_hashsize; i++) {
1210                rwlock_init(&sctp_assoc_hashtable[i].lock);
1211                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1212        }
1213
1214        /* Allocate and initialize the endpoint hash table.  */
1215        sctp_ep_hashsize = 64;
1216        sctp_ep_hashtable = (struct sctp_hashbucket *)
1217                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1218        if (!sctp_ep_hashtable) {
1219                printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1220                status = -ENOMEM;
1221                goto err_ehash_alloc;
1222        }
1223        for (i = 0; i < sctp_ep_hashsize; i++) {
1224                rwlock_init(&sctp_ep_hashtable[i].lock);
1225                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1226        }
1227
1228        /* Allocate and initialize the SCTP port hash table.  */
1229        do {
1230                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1231                                        sizeof(struct sctp_bind_hashbucket);
1232                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1233                        continue;
1234                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1235                                        __get_free_pages(GFP_ATOMIC, order);
1236        } while (!sctp_port_hashtable && --order > 0);
1237        if (!sctp_port_hashtable) {
1238                printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1239                status = -ENOMEM;
1240                goto err_bhash_alloc;
1241        }
1242        for (i = 0; i < sctp_port_hashsize; i++) {
1243                spin_lock_init(&sctp_port_hashtable[i].lock);
1244                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1245        }
1246
1247        printk(KERN_INFO "SCTP: Hash tables configured "
1248                         "(established %d bind %d)\n",
1249                sctp_assoc_hashsize, sctp_port_hashsize);
1250
1251        /* Disable ADDIP by default. */
1252        sctp_addip_enable = 0;
1253        sctp_addip_noauth = 0;
1254
1255        /* Enable PR-SCTP by default. */
1256        sctp_prsctp_enable = 1;
1257
1258        /* Disable AUTH by default. */
1259        sctp_auth_enable = 0;
1260
1261        sctp_sysctl_register();
1262
1263        INIT_LIST_HEAD(&sctp_address_families);
1264        sctp_v4_pf_init();
1265        sctp_v6_pf_init();
1266
1267        /* Initialize the local address list. */
1268        INIT_LIST_HEAD(&sctp_local_addr_list);
1269        spin_lock_init(&sctp_local_addr_lock);
1270        sctp_get_local_addr_list();
1271
1272        status = sctp_v4_protosw_init();
1273
1274        if (status)
1275                goto err_protosw_init;
1276
1277        status = sctp_v6_protosw_init();
1278        if (status)
1279                goto err_v6_protosw_init;
1280
1281        /* Initialize the control inode/socket for handling OOTB packets.  */
1282        if ((status = sctp_ctl_sock_init())) {
1283                printk (KERN_ERR
1284                        "SCTP: Failed to initialize the SCTP control sock.\n");
1285                goto err_ctl_sock_init;
1286        }
1287
1288        status = sctp_v4_add_protocol();
1289        if (status)
1290                goto err_add_protocol;
1291
1292        /* Register SCTP with inet6 layer.  */
1293        status = sctp_v6_add_protocol();
1294        if (status)
1295                goto err_v6_add_protocol;
1296
1297        status = 0;
1298out:
1299        return status;
1300err_v6_add_protocol:
1301        sctp_v4_del_protocol();
1302err_add_protocol:
1303        inet_ctl_sock_destroy(sctp_ctl_sock);
1304err_ctl_sock_init:
1305        sctp_v6_protosw_exit();
1306err_v6_protosw_init:
1307        sctp_v4_protosw_exit();
1308err_protosw_init:
1309        sctp_free_local_addr_list();
1310        sctp_v4_pf_exit();
1311        sctp_v6_pf_exit();
1312        sctp_sysctl_unregister();
1313        free_pages((unsigned long)sctp_port_hashtable,
1314                   get_order(sctp_port_hashsize *
1315                             sizeof(struct sctp_bind_hashbucket)));
1316err_bhash_alloc:
1317        kfree(sctp_ep_hashtable);
1318err_ehash_alloc:
1319        free_pages((unsigned long)sctp_assoc_hashtable,
1320                   get_order(sctp_assoc_hashsize *
1321                             sizeof(struct sctp_hashbucket)));
1322err_ahash_alloc:
1323        sctp_dbg_objcnt_exit();
1324        sctp_proc_exit();
1325err_init_proc:
1326        cleanup_sctp_mibs();
1327err_init_mibs:
1328        kmem_cache_destroy(sctp_chunk_cachep);
1329err_chunk_cachep:
1330        kmem_cache_destroy(sctp_bucket_cachep);
1331        goto out;
1332}
1333
1334/* Exit handler for the SCTP protocol.  */
1335SCTP_STATIC __exit void sctp_exit(void)
1336{
1337        /* BUG.  This should probably do something useful like clean
1338         * up all the remaining associations and all that memory.
1339         */
1340
1341        /* Unregister with inet6/inet layers. */
1342        sctp_v6_del_protocol();
1343        sctp_v4_del_protocol();
1344
1345        /* Free the control endpoint.  */
1346        inet_ctl_sock_destroy(sctp_ctl_sock);
1347
1348        /* Free protosw registrations */
1349        sctp_v6_protosw_exit();
1350        sctp_v4_protosw_exit();
1351
1352        /* Free the local address list.  */
1353        sctp_free_local_addr_list();
1354
1355        /* Unregister with socket layer. */
1356        sctp_v6_pf_exit();
1357        sctp_v4_pf_exit();
1358
1359        sctp_sysctl_unregister();
1360
1361        free_pages((unsigned long)sctp_assoc_hashtable,
1362                   get_order(sctp_assoc_hashsize *
1363                             sizeof(struct sctp_hashbucket)));
1364        kfree(sctp_ep_hashtable);
1365        free_pages((unsigned long)sctp_port_hashtable,
1366                   get_order(sctp_port_hashsize *
1367                             sizeof(struct sctp_bind_hashbucket)));
1368
1369        sctp_dbg_objcnt_exit();
1370        sctp_proc_exit();
1371        cleanup_sctp_mibs();
1372
1373        kmem_cache_destroy(sctp_chunk_cachep);
1374        kmem_cache_destroy(sctp_bucket_cachep);
1375}
1376
1377module_init(sctp_init);
1378module_exit(sctp_exit);
1379
1380/*
1381 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1382 */
1383MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1384MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1385MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1386MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1387module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1388MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1389MODULE_LICENSE("GPL");
1390