linux/net/sctp/protocol.c
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   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 <linux/slab.h>
  58#include <net/net_namespace.h>
  59#include <net/protocol.h>
  60#include <net/ip.h>
  61#include <net/ipv6.h>
  62#include <net/route.h>
  63#include <net/sctp/sctp.h>
  64#include <net/addrconf.h>
  65#include <net/inet_common.h>
  66#include <net/inet_ecn.h>
  67
  68/* Global data structures. */
  69struct sctp_globals sctp_globals __read_mostly;
  70DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
  71
  72#ifdef CONFIG_PROC_FS
  73struct proc_dir_entry   *proc_net_sctp;
  74#endif
  75
  76struct idr sctp_assocs_id;
  77DEFINE_SPINLOCK(sctp_assocs_id_lock);
  78
  79/* This is the global socket data structure used for responding to
  80 * the Out-of-the-blue (OOTB) packets.  A control sock will be created
  81 * for this socket at the initialization time.
  82 */
  83static struct sock *sctp_ctl_sock;
  84
  85static struct sctp_pf *sctp_pf_inet6_specific;
  86static struct sctp_pf *sctp_pf_inet_specific;
  87static struct sctp_af *sctp_af_v4_specific;
  88static struct sctp_af *sctp_af_v6_specific;
  89
  90struct kmem_cache *sctp_chunk_cachep __read_mostly;
  91struct kmem_cache *sctp_bucket_cachep __read_mostly;
  92
  93int sysctl_sctp_mem[3];
  94int sysctl_sctp_rmem[3];
  95int sysctl_sctp_wmem[3];
  96
  97/* Return the address of the control sock. */
  98struct sock *sctp_get_ctl_sock(void)
  99{
 100        return sctp_ctl_sock;
 101}
 102
 103/* Set up the proc fs entry for the SCTP protocol. */
 104static __init int sctp_proc_init(void)
 105{
 106        if (percpu_counter_init(&sctp_sockets_allocated, 0))
 107                goto out_nomem;
 108#ifdef CONFIG_PROC_FS
 109        if (!proc_net_sctp) {
 110                proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
 111                if (!proc_net_sctp)
 112                        goto out_free_percpu;
 113        }
 114
 115        if (sctp_snmp_proc_init())
 116                goto out_snmp_proc_init;
 117        if (sctp_eps_proc_init())
 118                goto out_eps_proc_init;
 119        if (sctp_assocs_proc_init())
 120                goto out_assocs_proc_init;
 121        if (sctp_remaddr_proc_init())
 122                goto out_remaddr_proc_init;
 123
 124        return 0;
 125
 126out_remaddr_proc_init:
 127        sctp_assocs_proc_exit();
 128out_assocs_proc_init:
 129        sctp_eps_proc_exit();
 130out_eps_proc_init:
 131        sctp_snmp_proc_exit();
 132out_snmp_proc_init:
 133        if (proc_net_sctp) {
 134                proc_net_sctp = NULL;
 135                remove_proc_entry("sctp", init_net.proc_net);
 136        }
 137out_free_percpu:
 138        percpu_counter_destroy(&sctp_sockets_allocated);
 139#else
 140        return 0;
 141#endif /* CONFIG_PROC_FS */
 142
 143out_nomem:
 144        return -ENOMEM;
 145}
 146
 147/* Clean up the proc fs entry for the SCTP protocol.
 148 * Note: Do not make this __exit as it is used in the init error
 149 * path.
 150 */
 151static void sctp_proc_exit(void)
 152{
 153#ifdef CONFIG_PROC_FS
 154        sctp_snmp_proc_exit();
 155        sctp_eps_proc_exit();
 156        sctp_assocs_proc_exit();
 157        sctp_remaddr_proc_exit();
 158
 159        if (proc_net_sctp) {
 160                proc_net_sctp = NULL;
 161                remove_proc_entry("sctp", init_net.proc_net);
 162        }
 163#endif
 164        percpu_counter_destroy(&sctp_sockets_allocated);
 165}
 166
 167/* Private helper to extract ipv4 address and stash them in
 168 * the protocol structure.
 169 */
 170static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 171                                  struct net_device *dev)
 172{
 173        struct in_device *in_dev;
 174        struct in_ifaddr *ifa;
 175        struct sctp_sockaddr_entry *addr;
 176
 177        rcu_read_lock();
 178        if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 179                rcu_read_unlock();
 180                return;
 181        }
 182
 183        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 184                /* Add the address to the local list.  */
 185                addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 186                if (addr) {
 187                        addr->a.v4.sin_family = AF_INET;
 188                        addr->a.v4.sin_port = 0;
 189                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 190                        addr->valid = 1;
 191                        INIT_LIST_HEAD(&addr->list);
 192                        list_add_tail(&addr->list, addrlist);
 193                }
 194        }
 195
 196        rcu_read_unlock();
 197}
 198
 199/* Extract our IP addresses from the system and stash them in the
 200 * protocol structure.
 201 */
 202static void sctp_get_local_addr_list(void)
 203{
 204        struct net_device *dev;
 205        struct list_head *pos;
 206        struct sctp_af *af;
 207
 208        rcu_read_lock();
 209        for_each_netdev_rcu(&init_net, dev) {
 210                __list_for_each(pos, &sctp_address_families) {
 211                        af = list_entry(pos, struct sctp_af, list);
 212                        af->copy_addrlist(&sctp_local_addr_list, dev);
 213                }
 214        }
 215        rcu_read_unlock();
 216}
 217
 218/* Free the existing local addresses.  */
 219static void sctp_free_local_addr_list(void)
 220{
 221        struct sctp_sockaddr_entry *addr;
 222        struct list_head *pos, *temp;
 223
 224        list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 225                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 226                list_del(pos);
 227                kfree(addr);
 228        }
 229}
 230
 231void sctp_local_addr_free(struct rcu_head *head)
 232{
 233        struct sctp_sockaddr_entry *e = container_of(head,
 234                                struct sctp_sockaddr_entry, rcu);
 235        kfree(e);
 236}
 237
 238/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 239int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 240                              gfp_t gfp, int copy_flags)
 241{
 242        struct sctp_sockaddr_entry *addr;
 243        int error = 0;
 244
 245        rcu_read_lock();
 246        list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
 247                if (!addr->valid)
 248                        continue;
 249                if (sctp_in_scope(&addr->a, scope)) {
 250                        /* Now that the address is in scope, check to see if
 251                         * the address type is really supported by the local
 252                         * sock as well as the remote peer.
 253                         */
 254                        if ((((AF_INET == addr->a.sa.sa_family) &&
 255                              (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 256                            (((AF_INET6 == addr->a.sa.sa_family) &&
 257                              (copy_flags & SCTP_ADDR6_ALLOWED) &&
 258                              (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 259                                error = sctp_add_bind_addr(bp, &addr->a,
 260                                                    SCTP_ADDR_SRC, GFP_ATOMIC);
 261                                if (error)
 262                                        goto end_copy;
 263                        }
 264                }
 265        }
 266
 267end_copy:
 268        rcu_read_unlock();
 269        return error;
 270}
 271
 272/* Initialize a sctp_addr from in incoming skb.  */
 273static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 274                             int is_saddr)
 275{
 276        void *from;
 277        __be16 *port;
 278        struct sctphdr *sh;
 279
 280        port = &addr->v4.sin_port;
 281        addr->v4.sin_family = AF_INET;
 282
 283        sh = sctp_hdr(skb);
 284        if (is_saddr) {
 285                *port  = sh->source;
 286                from = &ip_hdr(skb)->saddr;
 287        } else {
 288                *port = sh->dest;
 289                from = &ip_hdr(skb)->daddr;
 290        }
 291        memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 292}
 293
 294/* Initialize an sctp_addr from a socket. */
 295static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 296{
 297        addr->v4.sin_family = AF_INET;
 298        addr->v4.sin_port = 0;
 299        addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
 300}
 301
 302/* Initialize sk->sk_rcv_saddr from sctp_addr. */
 303static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 304{
 305        inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
 306}
 307
 308/* Initialize sk->sk_daddr from sctp_addr. */
 309static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 310{
 311        inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
 312}
 313
 314/* Initialize a sctp_addr from an address parameter. */
 315static void sctp_v4_from_addr_param(union sctp_addr *addr,
 316                                    union sctp_addr_param *param,
 317                                    __be16 port, int iif)
 318{
 319        addr->v4.sin_family = AF_INET;
 320        addr->v4.sin_port = port;
 321        addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 322}
 323
 324/* Initialize an address parameter from a sctp_addr and return the length
 325 * of the address parameter.
 326 */
 327static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 328                                 union sctp_addr_param *param)
 329{
 330        int length = sizeof(sctp_ipv4addr_param_t);
 331
 332        param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 333        param->v4.param_hdr.length = htons(length);
 334        param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 335
 336        return length;
 337}
 338
 339/* Initialize a sctp_addr from a dst_entry. */
 340static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct dst_entry *dst,
 341                              __be16 port)
 342{
 343        struct rtable *rt = (struct rtable *)dst;
 344        saddr->v4.sin_family = AF_INET;
 345        saddr->v4.sin_port = port;
 346        saddr->v4.sin_addr.s_addr = rt->rt_src;
 347}
 348
 349/* Compare two addresses exactly. */
 350static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 351                            const union sctp_addr *addr2)
 352{
 353        if (addr1->sa.sa_family != addr2->sa.sa_family)
 354                return 0;
 355        if (addr1->v4.sin_port != addr2->v4.sin_port)
 356                return 0;
 357        if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 358                return 0;
 359
 360        return 1;
 361}
 362
 363/* Initialize addr struct to INADDR_ANY. */
 364static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 365{
 366        addr->v4.sin_family = AF_INET;
 367        addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 368        addr->v4.sin_port = port;
 369}
 370
 371/* Is this a wildcard address? */
 372static int sctp_v4_is_any(const union sctp_addr *addr)
 373{
 374        return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 375}
 376
 377/* This function checks if the address is a valid address to be used for
 378 * SCTP binding.
 379 *
 380 * Output:
 381 * Return 0 - If the address is a non-unicast or an illegal address.
 382 * Return 1 - If the address is a unicast.
 383 */
 384static int sctp_v4_addr_valid(union sctp_addr *addr,
 385                              struct sctp_sock *sp,
 386                              const struct sk_buff *skb)
 387{
 388        /* IPv4 addresses not allowed */
 389        if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 390                return 0;
 391
 392        /* Is this a non-unicast address or a unusable SCTP address? */
 393        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 394                return 0;
 395
 396        /* Is this a broadcast address? */
 397        if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
 398                return 0;
 399
 400        return 1;
 401}
 402
 403/* Should this be available for binding?   */
 404static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 405{
 406        int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
 407
 408
 409        if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 410           ret != RTN_LOCAL &&
 411           !sp->inet.freebind &&
 412           !sysctl_ip_nonlocal_bind)
 413                return 0;
 414
 415        if (ipv6_only_sock(sctp_opt2sk(sp)))
 416                return 0;
 417
 418        return 1;
 419}
 420
 421/* Checking the loopback, private and other address scopes as defined in
 422 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 423 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 424 *
 425 * Level 0 - unusable SCTP addresses
 426 * Level 1 - loopback address
 427 * Level 2 - link-local addresses
 428 * Level 3 - private addresses.
 429 * Level 4 - global addresses
 430 * For INIT and INIT-ACK address list, let L be the level of
 431 * of requested destination address, sender and receiver
 432 * SHOULD include all of its addresses with level greater
 433 * than or equal to L.
 434 *
 435 * IPv4 scoping can be controlled through sysctl option
 436 * net.sctp.addr_scope_policy
 437 */
 438static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 439{
 440        sctp_scope_t retval;
 441
 442        /* Check for unusable SCTP addresses. */
 443        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 444                retval =  SCTP_SCOPE_UNUSABLE;
 445        } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 446                retval = SCTP_SCOPE_LOOPBACK;
 447        } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 448                retval = SCTP_SCOPE_LINK;
 449        } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 450                   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 451                   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 452                retval = SCTP_SCOPE_PRIVATE;
 453        } else {
 454                retval = SCTP_SCOPE_GLOBAL;
 455        }
 456
 457        return retval;
 458}
 459
 460/* Returns a valid dst cache entry for the given source and destination ip
 461 * addresses. If an association is passed, trys to get a dst entry with a
 462 * source address that matches an address in the bind address list.
 463 */
 464static struct dst_entry *sctp_v4_get_dst(struct sctp_association *asoc,
 465                                         union sctp_addr *daddr,
 466                                         union sctp_addr *saddr)
 467{
 468        struct rtable *rt;
 469        struct flowi fl;
 470        struct sctp_bind_addr *bp;
 471        struct sctp_sockaddr_entry *laddr;
 472        struct dst_entry *dst = NULL;
 473        union sctp_addr dst_saddr;
 474
 475        memset(&fl, 0x0, sizeof(struct flowi));
 476        fl.fl4_dst  = daddr->v4.sin_addr.s_addr;
 477        fl.fl_ip_dport = daddr->v4.sin_port;
 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                fl.fl_ip_sport = htons(asoc->base.bind_addr.port);
 483        }
 484        if (saddr) {
 485                fl.fl4_src = saddr->v4.sin_addr.s_addr;
 486                fl.fl_ip_sport = saddr->v4.sin_port;
 487        }
 488
 489        SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
 490                          __func__, &fl.fl4_dst, &fl.fl4_src);
 491
 492        if (!ip_route_output_key(&init_net, &rt, &fl)) {
 493                dst = &rt->u.dst;
 494        }
 495
 496        /* If there is no association or if a source address is passed, no
 497         * more validation is required.
 498         */
 499        if (!asoc || saddr)
 500                goto out;
 501
 502        bp = &asoc->base.bind_addr;
 503
 504        if (dst) {
 505                /* Walk through the bind address list and look for a bind
 506                 * address that matches the source address of the returned dst.
 507                 */
 508                sctp_v4_dst_saddr(&dst_saddr, dst, htons(bp->port));
 509                rcu_read_lock();
 510                list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 511                        if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
 512                                continue;
 513                        if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 514                                goto out_unlock;
 515                }
 516                rcu_read_unlock();
 517
 518                /* None of the bound addresses match the source address of the
 519                 * dst. So release it.
 520                 */
 521                dst_release(dst);
 522                dst = NULL;
 523        }
 524
 525        /* Walk through the bind address list and try to get a dst that
 526         * matches a bind address as the source address.
 527         */
 528        rcu_read_lock();
 529        list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 530                if (!laddr->valid)
 531                        continue;
 532                if ((laddr->state == SCTP_ADDR_SRC) &&
 533                    (AF_INET == laddr->a.sa.sa_family)) {
 534                        fl.fl4_src = laddr->a.v4.sin_addr.s_addr;
 535                        fl.fl_ip_sport = laddr->a.v4.sin_port;
 536                        if (!ip_route_output_key(&init_net, &rt, &fl)) {
 537                                dst = &rt->u.dst;
 538                                goto out_unlock;
 539                        }
 540                }
 541        }
 542
 543out_unlock:
 544        rcu_read_unlock();
 545out:
 546        if (dst)
 547                SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
 548                                  &rt->rt_dst, &rt->rt_src);
 549        else
 550                SCTP_DEBUG_PRINTK("NO ROUTE\n");
 551
 552        return dst;
 553}
 554
 555/* For v4, the source address is cached in the route entry(dst). So no need
 556 * to cache it separately and hence this is an empty routine.
 557 */
 558static void sctp_v4_get_saddr(struct sctp_sock *sk,
 559                              struct sctp_association *asoc,
 560                              struct dst_entry *dst,
 561                              union sctp_addr *daddr,
 562                              union sctp_addr *saddr)
 563{
 564        struct rtable *rt = (struct rtable *)dst;
 565
 566        if (!asoc)
 567                return;
 568
 569        if (rt) {
 570                saddr->v4.sin_family = AF_INET;
 571                saddr->v4.sin_port = htons(asoc->base.bind_addr.port);
 572                saddr->v4.sin_addr.s_addr = rt->rt_src;
 573        }
 574}
 575
 576/* What interface did this skb arrive on? */
 577static int sctp_v4_skb_iif(const struct sk_buff *skb)
 578{
 579        return skb_rtable(skb)->rt_iif;
 580}
 581
 582/* Was this packet marked by Explicit Congestion Notification? */
 583static int sctp_v4_is_ce(const struct sk_buff *skb)
 584{
 585        return INET_ECN_is_ce(ip_hdr(skb)->tos);
 586}
 587
 588/* Create and initialize a new sk for the socket returned by accept(). */
 589static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 590                                             struct sctp_association *asoc)
 591{
 592        struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 593                        sk->sk_prot);
 594        struct inet_sock *newinet;
 595
 596        if (!newsk)
 597                goto out;
 598
 599        sock_init_data(NULL, newsk);
 600
 601        sctp_copy_sock(newsk, sk, asoc);
 602        sock_reset_flag(newsk, SOCK_ZAPPED);
 603
 604        newinet = inet_sk(newsk);
 605
 606        newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 607
 608        sk_refcnt_debug_inc(newsk);
 609
 610        if (newsk->sk_prot->init(newsk)) {
 611                sk_common_release(newsk);
 612                newsk = NULL;
 613        }
 614
 615out:
 616        return newsk;
 617}
 618
 619/* Map address, empty for v4 family */
 620static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 621{
 622        /* Empty */
 623}
 624
 625/* Dump the v4 addr to the seq file. */
 626static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 627{
 628        seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 629}
 630
 631static void sctp_v4_ecn_capable(struct sock *sk)
 632{
 633        INET_ECN_xmit(sk);
 634}
 635
 636/* Event handler for inet address addition/deletion events.
 637 * The sctp_local_addr_list needs to be protocted by a spin lock since
 638 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 639 * time and thus corrupt the list.
 640 * The reader side is protected with RCU.
 641 */
 642static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 643                               void *ptr)
 644{
 645        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 646        struct sctp_sockaddr_entry *addr = NULL;
 647        struct sctp_sockaddr_entry *temp;
 648        int found = 0;
 649
 650        if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
 651                return NOTIFY_DONE;
 652
 653        switch (ev) {
 654        case NETDEV_UP:
 655                addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 656                if (addr) {
 657                        addr->a.v4.sin_family = AF_INET;
 658                        addr->a.v4.sin_port = 0;
 659                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 660                        addr->valid = 1;
 661                        spin_lock_bh(&sctp_local_addr_lock);
 662                        list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 663                        spin_unlock_bh(&sctp_local_addr_lock);
 664                }
 665                break;
 666        case NETDEV_DOWN:
 667                spin_lock_bh(&sctp_local_addr_lock);
 668                list_for_each_entry_safe(addr, temp,
 669                                        &sctp_local_addr_list, list) {
 670                        if (addr->a.sa.sa_family == AF_INET &&
 671                                        addr->a.v4.sin_addr.s_addr ==
 672                                        ifa->ifa_local) {
 673                                found = 1;
 674                                addr->valid = 0;
 675                                list_del_rcu(&addr->list);
 676                                break;
 677                        }
 678                }
 679                spin_unlock_bh(&sctp_local_addr_lock);
 680                if (found)
 681                        call_rcu(&addr->rcu, sctp_local_addr_free);
 682                break;
 683        }
 684
 685        return NOTIFY_DONE;
 686}
 687
 688/*
 689 * Initialize the control inode/socket with a control endpoint data
 690 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 691 */
 692static int sctp_ctl_sock_init(void)
 693{
 694        int err;
 695        sa_family_t family = PF_INET;
 696
 697        if (sctp_get_pf_specific(PF_INET6))
 698                family = PF_INET6;
 699
 700        err = inet_ctl_sock_create(&sctp_ctl_sock, family,
 701                                   SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
 702
 703        /* If IPv6 socket could not be created, try the IPv4 socket */
 704        if (err < 0 && family == PF_INET6)
 705                err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
 706                                           SOCK_SEQPACKET, IPPROTO_SCTP,
 707                                           &init_net);
 708
 709        if (err < 0) {
 710                printk(KERN_ERR
 711                       "SCTP: Failed to create the SCTP control socket.\n");
 712                return err;
 713        }
 714        return 0;
 715}
 716
 717/* Register address family specific functions. */
 718int sctp_register_af(struct sctp_af *af)
 719{
 720        switch (af->sa_family) {
 721        case AF_INET:
 722                if (sctp_af_v4_specific)
 723                        return 0;
 724                sctp_af_v4_specific = af;
 725                break;
 726        case AF_INET6:
 727                if (sctp_af_v6_specific)
 728                        return 0;
 729                sctp_af_v6_specific = af;
 730                break;
 731        default:
 732                return 0;
 733        }
 734
 735        INIT_LIST_HEAD(&af->list);
 736        list_add_tail(&af->list, &sctp_address_families);
 737        return 1;
 738}
 739
 740/* Get the table of functions for manipulating a particular address
 741 * family.
 742 */
 743struct sctp_af *sctp_get_af_specific(sa_family_t family)
 744{
 745        switch (family) {
 746        case AF_INET:
 747                return sctp_af_v4_specific;
 748        case AF_INET6:
 749                return sctp_af_v6_specific;
 750        default:
 751                return NULL;
 752        }
 753}
 754
 755/* Common code to initialize a AF_INET msg_name. */
 756static void sctp_inet_msgname(char *msgname, int *addr_len)
 757{
 758        struct sockaddr_in *sin;
 759
 760        sin = (struct sockaddr_in *)msgname;
 761        *addr_len = sizeof(struct sockaddr_in);
 762        sin->sin_family = AF_INET;
 763        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 764}
 765
 766/* Copy the primary address of the peer primary address as the msg_name. */
 767static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 768                                    int *addr_len)
 769{
 770        struct sockaddr_in *sin, *sinfrom;
 771
 772        if (msgname) {
 773                struct sctp_association *asoc;
 774
 775                asoc = event->asoc;
 776                sctp_inet_msgname(msgname, addr_len);
 777                sin = (struct sockaddr_in *)msgname;
 778                sinfrom = &asoc->peer.primary_addr.v4;
 779                sin->sin_port = htons(asoc->peer.port);
 780                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 781        }
 782}
 783
 784/* Initialize and copy out a msgname from an inbound skb. */
 785static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 786{
 787        if (msgname) {
 788                struct sctphdr *sh = sctp_hdr(skb);
 789                struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 790
 791                sctp_inet_msgname(msgname, len);
 792                sin->sin_port = sh->source;
 793                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 794        }
 795}
 796
 797/* Do we support this AF? */
 798static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 799{
 800        /* PF_INET only supports AF_INET addresses. */
 801        return (AF_INET == family);
 802}
 803
 804/* Address matching with wildcards allowed. */
 805static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 806                              const union sctp_addr *addr2,
 807                              struct sctp_sock *opt)
 808{
 809        /* PF_INET only supports AF_INET addresses. */
 810        if (addr1->sa.sa_family != addr2->sa.sa_family)
 811                return 0;
 812        if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 813            htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 814                return 1;
 815        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 816                return 1;
 817
 818        return 0;
 819}
 820
 821/* Verify that provided sockaddr looks bindable.  Common verification has
 822 * already been taken care of.
 823 */
 824static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 825{
 826        return sctp_v4_available(addr, opt);
 827}
 828
 829/* Verify that sockaddr looks sendable.  Common verification has already
 830 * been taken care of.
 831 */
 832static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 833{
 834        return 1;
 835}
 836
 837/* Fill in Supported Address Type information for INIT and INIT-ACK
 838 * chunks.  Returns number of addresses supported.
 839 */
 840static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 841                                     __be16 *types)
 842{
 843        types[0] = SCTP_PARAM_IPV4_ADDRESS;
 844        return 1;
 845}
 846
 847/* Wrapper routine that calls the ip transmit routine. */
 848static inline int sctp_v4_xmit(struct sk_buff *skb,
 849                               struct sctp_transport *transport)
 850{
 851        struct inet_sock *inet = inet_sk(skb->sk);
 852
 853        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 854                          __func__, skb, skb->len,
 855                          &skb_rtable(skb)->rt_src,
 856                          &skb_rtable(skb)->rt_dst);
 857
 858        inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 859                         IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 860
 861        SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 862        return ip_queue_xmit(skb);
 863}
 864
 865static struct sctp_af sctp_af_inet;
 866
 867static struct sctp_pf sctp_pf_inet = {
 868        .event_msgname = sctp_inet_event_msgname,
 869        .skb_msgname   = sctp_inet_skb_msgname,
 870        .af_supported  = sctp_inet_af_supported,
 871        .cmp_addr      = sctp_inet_cmp_addr,
 872        .bind_verify   = sctp_inet_bind_verify,
 873        .send_verify   = sctp_inet_send_verify,
 874        .supported_addrs = sctp_inet_supported_addrs,
 875        .create_accept_sk = sctp_v4_create_accept_sk,
 876        .addr_v4map     = sctp_v4_addr_v4map,
 877        .af            = &sctp_af_inet
 878};
 879
 880/* Notifier for inetaddr addition/deletion events.  */
 881static struct notifier_block sctp_inetaddr_notifier = {
 882        .notifier_call = sctp_inetaddr_event,
 883};
 884
 885/* Socket operations.  */
 886static const struct proto_ops inet_seqpacket_ops = {
 887        .family            = PF_INET,
 888        .owner             = THIS_MODULE,
 889        .release           = inet_release,      /* Needs to be wrapped... */
 890        .bind              = inet_bind,
 891        .connect           = inet_dgram_connect,
 892        .socketpair        = sock_no_socketpair,
 893        .accept            = inet_accept,
 894        .getname           = inet_getname,      /* Semantics are different.  */
 895        .poll              = sctp_poll,
 896        .ioctl             = inet_ioctl,
 897        .listen            = sctp_inet_listen,
 898        .shutdown          = inet_shutdown,     /* Looks harmless.  */
 899        .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
 900        .getsockopt        = sock_common_getsockopt,
 901        .sendmsg           = inet_sendmsg,
 902        .recvmsg           = sock_common_recvmsg,
 903        .mmap              = sock_no_mmap,
 904        .sendpage          = sock_no_sendpage,
 905#ifdef CONFIG_COMPAT
 906        .compat_setsockopt = compat_sock_common_setsockopt,
 907        .compat_getsockopt = compat_sock_common_getsockopt,
 908#endif
 909};
 910
 911/* Registration with AF_INET family.  */
 912static struct inet_protosw sctp_seqpacket_protosw = {
 913        .type       = SOCK_SEQPACKET,
 914        .protocol   = IPPROTO_SCTP,
 915        .prot       = &sctp_prot,
 916        .ops        = &inet_seqpacket_ops,
 917        .no_check   = 0,
 918        .flags      = SCTP_PROTOSW_FLAG
 919};
 920static struct inet_protosw sctp_stream_protosw = {
 921        .type       = SOCK_STREAM,
 922        .protocol   = IPPROTO_SCTP,
 923        .prot       = &sctp_prot,
 924        .ops        = &inet_seqpacket_ops,
 925        .no_check   = 0,
 926        .flags      = SCTP_PROTOSW_FLAG
 927};
 928
 929/* Register with IP layer.  */
 930static const struct net_protocol sctp_protocol = {
 931        .handler     = sctp_rcv,
 932        .err_handler = sctp_v4_err,
 933        .no_policy   = 1,
 934};
 935
 936/* IPv4 address related functions.  */
 937static struct sctp_af sctp_af_inet = {
 938        .sa_family         = AF_INET,
 939        .sctp_xmit         = sctp_v4_xmit,
 940        .setsockopt        = ip_setsockopt,
 941        .getsockopt        = ip_getsockopt,
 942        .get_dst           = sctp_v4_get_dst,
 943        .get_saddr         = sctp_v4_get_saddr,
 944        .copy_addrlist     = sctp_v4_copy_addrlist,
 945        .from_skb          = sctp_v4_from_skb,
 946        .from_sk           = sctp_v4_from_sk,
 947        .to_sk_saddr       = sctp_v4_to_sk_saddr,
 948        .to_sk_daddr       = sctp_v4_to_sk_daddr,
 949        .from_addr_param   = sctp_v4_from_addr_param,
 950        .to_addr_param     = sctp_v4_to_addr_param,
 951        .dst_saddr         = sctp_v4_dst_saddr,
 952        .cmp_addr          = sctp_v4_cmp_addr,
 953        .addr_valid        = sctp_v4_addr_valid,
 954        .inaddr_any        = sctp_v4_inaddr_any,
 955        .is_any            = sctp_v4_is_any,
 956        .available         = sctp_v4_available,
 957        .scope             = sctp_v4_scope,
 958        .skb_iif           = sctp_v4_skb_iif,
 959        .is_ce             = sctp_v4_is_ce,
 960        .seq_dump_addr     = sctp_v4_seq_dump_addr,
 961        .ecn_capable       = sctp_v4_ecn_capable,
 962        .net_header_len    = sizeof(struct iphdr),
 963        .sockaddr_len      = sizeof(struct sockaddr_in),
 964#ifdef CONFIG_COMPAT
 965        .compat_setsockopt = compat_ip_setsockopt,
 966        .compat_getsockopt = compat_ip_getsockopt,
 967#endif
 968};
 969
 970struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
 971
 972        switch (family) {
 973        case PF_INET:
 974                return sctp_pf_inet_specific;
 975        case PF_INET6:
 976                return sctp_pf_inet6_specific;
 977        default:
 978                return NULL;
 979        }
 980}
 981
 982/* Register the PF specific function table.  */
 983int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
 984{
 985        switch (family) {
 986        case PF_INET:
 987                if (sctp_pf_inet_specific)
 988                        return 0;
 989                sctp_pf_inet_specific = pf;
 990                break;
 991        case PF_INET6:
 992                if (sctp_pf_inet6_specific)
 993                        return 0;
 994                sctp_pf_inet6_specific = pf;
 995                break;
 996        default:
 997                return 0;
 998        }
 999        return 1;
1000}
1001
1002static inline int init_sctp_mibs(void)
1003{
1004        return snmp_mib_init((void __percpu **)sctp_statistics,
1005                             sizeof(struct sctp_mib));
1006}
1007
1008static inline void cleanup_sctp_mibs(void)
1009{
1010        snmp_mib_free((void __percpu **)sctp_statistics);
1011}
1012
1013static void sctp_v4_pf_init(void)
1014{
1015        /* Initialize the SCTP specific PF functions. */
1016        sctp_register_pf(&sctp_pf_inet, PF_INET);
1017        sctp_register_af(&sctp_af_inet);
1018}
1019
1020static void sctp_v4_pf_exit(void)
1021{
1022        list_del(&sctp_af_inet.list);
1023}
1024
1025static int sctp_v4_protosw_init(void)
1026{
1027        int rc;
1028
1029        rc = proto_register(&sctp_prot, 1);
1030        if (rc)
1031                return rc;
1032
1033        /* Register SCTP(UDP and TCP style) with socket layer.  */
1034        inet_register_protosw(&sctp_seqpacket_protosw);
1035        inet_register_protosw(&sctp_stream_protosw);
1036
1037        return 0;
1038}
1039
1040static void sctp_v4_protosw_exit(void)
1041{
1042        inet_unregister_protosw(&sctp_stream_protosw);
1043        inet_unregister_protosw(&sctp_seqpacket_protosw);
1044        proto_unregister(&sctp_prot);
1045}
1046
1047static int sctp_v4_add_protocol(void)
1048{
1049        /* Register notifier for inet address additions/deletions. */
1050        register_inetaddr_notifier(&sctp_inetaddr_notifier);
1051
1052        /* Register SCTP with inet layer.  */
1053        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1054                return -EAGAIN;
1055
1056        return 0;
1057}
1058
1059static void sctp_v4_del_protocol(void)
1060{
1061        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1062        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1063}
1064
1065/* Initialize the universe into something sensible.  */
1066SCTP_STATIC __init int sctp_init(void)
1067{
1068        int i;
1069        int status = -EINVAL;
1070        unsigned long goal;
1071        unsigned long limit;
1072        unsigned long nr_pages;
1073        int max_share;
1074        int order;
1075
1076        /* SCTP_DEBUG sanity check. */
1077        if (!sctp_sanity_check())
1078                goto out;
1079
1080        /* Allocate bind_bucket and chunk caches. */
1081        status = -ENOBUFS;
1082        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1083                                               sizeof(struct sctp_bind_bucket),
1084                                               0, SLAB_HWCACHE_ALIGN,
1085                                               NULL);
1086        if (!sctp_bucket_cachep)
1087                goto out;
1088
1089        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1090                                               sizeof(struct sctp_chunk),
1091                                               0, SLAB_HWCACHE_ALIGN,
1092                                               NULL);
1093        if (!sctp_chunk_cachep)
1094                goto err_chunk_cachep;
1095
1096        /* Allocate and initialise sctp mibs.  */
1097        status = init_sctp_mibs();
1098        if (status)
1099                goto err_init_mibs;
1100
1101        /* Initialize proc fs directory.  */
1102        status = sctp_proc_init();
1103        if (status)
1104                goto err_init_proc;
1105
1106        /* Initialize object count debugging.  */
1107        sctp_dbg_objcnt_init();
1108
1109        /*
1110         * 14. Suggested SCTP Protocol Parameter Values
1111         */
1112        /* The following protocol parameters are RECOMMENDED:  */
1113        /* RTO.Initial              - 3  seconds */
1114        sctp_rto_initial                = SCTP_RTO_INITIAL;
1115        /* RTO.Min                  - 1  second */
1116        sctp_rto_min                    = SCTP_RTO_MIN;
1117        /* RTO.Max                 -  60 seconds */
1118        sctp_rto_max                    = SCTP_RTO_MAX;
1119        /* RTO.Alpha                - 1/8 */
1120        sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1121        /* RTO.Beta                 - 1/4 */
1122        sctp_rto_beta                   = SCTP_RTO_BETA;
1123
1124        /* Valid.Cookie.Life        - 60  seconds */
1125        sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1126
1127        /* Whether Cookie Preservative is enabled(1) or not(0) */
1128        sctp_cookie_preserve_enable     = 1;
1129
1130        /* Max.Burst                - 4 */
1131        sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1132
1133        /* Association.Max.Retrans  - 10 attempts
1134         * Path.Max.Retrans         - 5  attempts (per destination address)
1135         * Max.Init.Retransmits     - 8  attempts
1136         */
1137        sctp_max_retrans_association    = 10;
1138        sctp_max_retrans_path           = 5;
1139        sctp_max_retrans_init           = 8;
1140
1141        /* Sendbuffer growth        - do per-socket accounting */
1142        sctp_sndbuf_policy              = 0;
1143
1144        /* Rcvbuffer growth         - do per-socket accounting */
1145        sctp_rcvbuf_policy              = 0;
1146
1147        /* HB.interval              - 30 seconds */
1148        sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1149
1150        /* delayed SACK timeout */
1151        sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1152
1153        /* Implementation specific variables. */
1154
1155        /* Initialize default stream count setup information. */
1156        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1157        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1158
1159        /* Initialize handle used for association ids. */
1160        idr_init(&sctp_assocs_id);
1161
1162        /* Set the pressure threshold to be a fraction of global memory that
1163         * is up to 1/2 at 256 MB, decreasing toward zero with the amount of
1164         * memory, with a floor of 128 pages.
1165         * Note this initalizes the data in sctpv6_prot too
1166         * Unabashedly stolen from tcp_init
1167         */
1168        nr_pages = totalram_pages - totalhigh_pages;
1169        limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT);
1170        limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11);
1171        limit = max(limit, 128UL);
1172        sysctl_sctp_mem[0] = limit / 4 * 3;
1173        sysctl_sctp_mem[1] = limit;
1174        sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1175
1176        /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1177        limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1178        max_share = min(4UL*1024*1024, limit);
1179
1180        sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1181        sysctl_sctp_rmem[1] = (1500 *(sizeof(struct sk_buff) + 1));
1182        sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1183
1184        sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1185        sysctl_sctp_wmem[1] = 16*1024;
1186        sysctl_sctp_wmem[2] = max(64*1024, max_share);
1187
1188        /* Size and allocate the association hash table.
1189         * The methodology is similar to that of the tcp hash tables.
1190         */
1191        if (totalram_pages >= (128 * 1024))
1192                goal = totalram_pages >> (22 - PAGE_SHIFT);
1193        else
1194                goal = totalram_pages >> (24 - PAGE_SHIFT);
1195
1196        for (order = 0; (1UL << order) < goal; order++)
1197                ;
1198
1199        do {
1200                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1201                                        sizeof(struct sctp_hashbucket);
1202                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1203                        continue;
1204                sctp_assoc_hashtable = (struct sctp_hashbucket *)
1205                                        __get_free_pages(GFP_ATOMIC, order);
1206        } while (!sctp_assoc_hashtable && --order > 0);
1207        if (!sctp_assoc_hashtable) {
1208                printk(KERN_ERR "SCTP: Failed association hash alloc.\n");
1209                status = -ENOMEM;
1210                goto err_ahash_alloc;
1211        }
1212        for (i = 0; i < sctp_assoc_hashsize; i++) {
1213                rwlock_init(&sctp_assoc_hashtable[i].lock);
1214                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1215        }
1216
1217        /* Allocate and initialize the endpoint hash table.  */
1218        sctp_ep_hashsize = 64;
1219        sctp_ep_hashtable = (struct sctp_hashbucket *)
1220                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1221        if (!sctp_ep_hashtable) {
1222                printk(KERN_ERR "SCTP: Failed endpoint_hash alloc.\n");
1223                status = -ENOMEM;
1224                goto err_ehash_alloc;
1225        }
1226        for (i = 0; i < sctp_ep_hashsize; i++) {
1227                rwlock_init(&sctp_ep_hashtable[i].lock);
1228                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1229        }
1230
1231        /* Allocate and initialize the SCTP port hash table.  */
1232        do {
1233                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1234                                        sizeof(struct sctp_bind_hashbucket);
1235                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1236                        continue;
1237                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1238                                        __get_free_pages(GFP_ATOMIC, order);
1239        } while (!sctp_port_hashtable && --order > 0);
1240        if (!sctp_port_hashtable) {
1241                printk(KERN_ERR "SCTP: Failed bind hash alloc.");
1242                status = -ENOMEM;
1243                goto err_bhash_alloc;
1244        }
1245        for (i = 0; i < sctp_port_hashsize; i++) {
1246                spin_lock_init(&sctp_port_hashtable[i].lock);
1247                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1248        }
1249
1250        printk(KERN_INFO "SCTP: Hash tables configured "
1251                         "(established %d bind %d)\n",
1252                sctp_assoc_hashsize, sctp_port_hashsize);
1253
1254        /* Disable ADDIP by default. */
1255        sctp_addip_enable = 0;
1256        sctp_addip_noauth = 0;
1257
1258        /* Enable PR-SCTP by default. */
1259        sctp_prsctp_enable = 1;
1260
1261        /* Disable AUTH by default. */
1262        sctp_auth_enable = 0;
1263
1264        /* Set SCOPE policy to enabled */
1265        sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1266
1267        /* Set the default rwnd update threshold */
1268        sctp_rwnd_upd_shift             = SCTP_DEFAULT_RWND_SHIFT;
1269
1270        sctp_sysctl_register();
1271
1272        INIT_LIST_HEAD(&sctp_address_families);
1273        sctp_v4_pf_init();
1274        sctp_v6_pf_init();
1275
1276        /* Initialize the local address list. */
1277        INIT_LIST_HEAD(&sctp_local_addr_list);
1278        spin_lock_init(&sctp_local_addr_lock);
1279        sctp_get_local_addr_list();
1280
1281        status = sctp_v4_protosw_init();
1282
1283        if (status)
1284                goto err_protosw_init;
1285
1286        status = sctp_v6_protosw_init();
1287        if (status)
1288                goto err_v6_protosw_init;
1289
1290        /* Initialize the control inode/socket for handling OOTB packets.  */
1291        if ((status = sctp_ctl_sock_init())) {
1292                printk (KERN_ERR
1293                        "SCTP: Failed to initialize the SCTP control sock.\n");
1294                goto err_ctl_sock_init;
1295        }
1296
1297        status = sctp_v4_add_protocol();
1298        if (status)
1299                goto err_add_protocol;
1300
1301        /* Register SCTP with inet6 layer.  */
1302        status = sctp_v6_add_protocol();
1303        if (status)
1304                goto err_v6_add_protocol;
1305
1306        status = 0;
1307out:
1308        return status;
1309err_v6_add_protocol:
1310        sctp_v4_del_protocol();
1311err_add_protocol:
1312        inet_ctl_sock_destroy(sctp_ctl_sock);
1313err_ctl_sock_init:
1314        sctp_v6_protosw_exit();
1315err_v6_protosw_init:
1316        sctp_v4_protosw_exit();
1317err_protosw_init:
1318        sctp_free_local_addr_list();
1319        sctp_v4_pf_exit();
1320        sctp_v6_pf_exit();
1321        sctp_sysctl_unregister();
1322        free_pages((unsigned long)sctp_port_hashtable,
1323                   get_order(sctp_port_hashsize *
1324                             sizeof(struct sctp_bind_hashbucket)));
1325err_bhash_alloc:
1326        kfree(sctp_ep_hashtable);
1327err_ehash_alloc:
1328        free_pages((unsigned long)sctp_assoc_hashtable,
1329                   get_order(sctp_assoc_hashsize *
1330                             sizeof(struct sctp_hashbucket)));
1331err_ahash_alloc:
1332        sctp_dbg_objcnt_exit();
1333        sctp_proc_exit();
1334err_init_proc:
1335        cleanup_sctp_mibs();
1336err_init_mibs:
1337        kmem_cache_destroy(sctp_chunk_cachep);
1338err_chunk_cachep:
1339        kmem_cache_destroy(sctp_bucket_cachep);
1340        goto out;
1341}
1342
1343/* Exit handler for the SCTP protocol.  */
1344SCTP_STATIC __exit void sctp_exit(void)
1345{
1346        /* BUG.  This should probably do something useful like clean
1347         * up all the remaining associations and all that memory.
1348         */
1349
1350        /* Unregister with inet6/inet layers. */
1351        sctp_v6_del_protocol();
1352        sctp_v4_del_protocol();
1353
1354        /* Free the control endpoint.  */
1355        inet_ctl_sock_destroy(sctp_ctl_sock);
1356
1357        /* Free protosw registrations */
1358        sctp_v6_protosw_exit();
1359        sctp_v4_protosw_exit();
1360
1361        /* Free the local address list.  */
1362        sctp_free_local_addr_list();
1363
1364        /* Unregister with socket layer. */
1365        sctp_v6_pf_exit();
1366        sctp_v4_pf_exit();
1367
1368        sctp_sysctl_unregister();
1369
1370        free_pages((unsigned long)sctp_assoc_hashtable,
1371                   get_order(sctp_assoc_hashsize *
1372                             sizeof(struct sctp_hashbucket)));
1373        kfree(sctp_ep_hashtable);
1374        free_pages((unsigned long)sctp_port_hashtable,
1375                   get_order(sctp_port_hashsize *
1376                             sizeof(struct sctp_bind_hashbucket)));
1377
1378        sctp_dbg_objcnt_exit();
1379        sctp_proc_exit();
1380        cleanup_sctp_mibs();
1381
1382        rcu_barrier(); /* Wait for completion of call_rcu()'s */
1383
1384        kmem_cache_destroy(sctp_chunk_cachep);
1385        kmem_cache_destroy(sctp_bucket_cachep);
1386}
1387
1388module_init(sctp_init);
1389module_exit(sctp_exit);
1390
1391/*
1392 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1393 */
1394MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1395MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1396MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1397MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1398module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1399MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1400MODULE_LICENSE("GPL");
1401