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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  50
  51#include <linux/module.h>
  52#include <linux/init.h>
  53#include <linux/netdevice.h>
  54#include <linux/inetdevice.h>
  55#include <linux/seq_file.h>
  56#include <linux/bootmem.h>
  57#include <linux/highmem.h>
  58#include <linux/swap.h>
  59#include <linux/slab.h>
  60#include <net/net_namespace.h>
  61#include <net/protocol.h>
  62#include <net/ip.h>
  63#include <net/ipv6.h>
  64#include <net/route.h>
  65#include <net/sctp/sctp.h>
  66#include <net/addrconf.h>
  67#include <net/inet_common.h>
  68#include <net/inet_ecn.h>
  69
  70/* Global data structures. */
  71struct sctp_globals sctp_globals __read_mostly;
  72
  73struct idr sctp_assocs_id;
  74DEFINE_SPINLOCK(sctp_assocs_id_lock);
  75
  76static struct sctp_pf *sctp_pf_inet6_specific;
  77static struct sctp_pf *sctp_pf_inet_specific;
  78static struct sctp_af *sctp_af_v4_specific;
  79static struct sctp_af *sctp_af_v6_specific;
  80
  81struct kmem_cache *sctp_chunk_cachep __read_mostly;
  82struct kmem_cache *sctp_bucket_cachep __read_mostly;
  83
  84long sysctl_sctp_mem[3];
  85int sysctl_sctp_rmem[3];
  86int sysctl_sctp_wmem[3];
  87
  88/* Set up the proc fs entry for the SCTP protocol. */
  89static __net_init int sctp_proc_init(struct net *net)
  90{
  91#ifdef CONFIG_PROC_FS
  92        net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
  93        if (!net->sctp.proc_net_sctp)
  94                goto out_proc_net_sctp;
  95        if (sctp_snmp_proc_init(net))
  96                goto out_snmp_proc_init;
  97        if (sctp_eps_proc_init(net))
  98                goto out_eps_proc_init;
  99        if (sctp_assocs_proc_init(net))
 100                goto out_assocs_proc_init;
 101        if (sctp_remaddr_proc_init(net))
 102                goto out_remaddr_proc_init;
 103
 104        return 0;
 105
 106out_remaddr_proc_init:
 107        sctp_assocs_proc_exit(net);
 108out_assocs_proc_init:
 109        sctp_eps_proc_exit(net);
 110out_eps_proc_init:
 111        sctp_snmp_proc_exit(net);
 112out_snmp_proc_init:
 113        remove_proc_entry("sctp", net->proc_net);
 114        net->sctp.proc_net_sctp = NULL;
 115out_proc_net_sctp:
 116        return -ENOMEM;
 117#endif /* CONFIG_PROC_FS */
 118        return 0;
 119}
 120
 121/* Clean up the proc fs entry for the SCTP protocol.
 122 * Note: Do not make this __exit as it is used in the init error
 123 * path.
 124 */
 125static void sctp_proc_exit(struct net *net)
 126{
 127#ifdef CONFIG_PROC_FS
 128        sctp_snmp_proc_exit(net);
 129        sctp_eps_proc_exit(net);
 130        sctp_assocs_proc_exit(net);
 131        sctp_remaddr_proc_exit(net);
 132
 133        remove_proc_entry("sctp", net->proc_net);
 134        net->sctp.proc_net_sctp = NULL;
 135#endif
 136}
 137
 138/* Private helper to extract ipv4 address and stash them in
 139 * the protocol structure.
 140 */
 141static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 142                                  struct net_device *dev)
 143{
 144        struct in_device *in_dev;
 145        struct in_ifaddr *ifa;
 146        struct sctp_sockaddr_entry *addr;
 147
 148        rcu_read_lock();
 149        if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 150                rcu_read_unlock();
 151                return;
 152        }
 153
 154        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 155                /* Add the address to the local list.  */
 156                addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 157                if (addr) {
 158                        addr->a.v4.sin_family = AF_INET;
 159                        addr->a.v4.sin_port = 0;
 160                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 161                        addr->valid = 1;
 162                        INIT_LIST_HEAD(&addr->list);
 163                        list_add_tail(&addr->list, addrlist);
 164                }
 165        }
 166
 167        rcu_read_unlock();
 168}
 169
 170/* Extract our IP addresses from the system and stash them in the
 171 * protocol structure.
 172 */
 173static void sctp_get_local_addr_list(struct net *net)
 174{
 175        struct net_device *dev;
 176        struct list_head *pos;
 177        struct sctp_af *af;
 178
 179        rcu_read_lock();
 180        for_each_netdev_rcu(net, dev) {
 181                __list_for_each(pos, &sctp_address_families) {
 182                        af = list_entry(pos, struct sctp_af, list);
 183                        af->copy_addrlist(&net->sctp.local_addr_list, dev);
 184                }
 185        }
 186        rcu_read_unlock();
 187}
 188
 189/* Free the existing local addresses.  */
 190static void sctp_free_local_addr_list(struct net *net)
 191{
 192        struct sctp_sockaddr_entry *addr;
 193        struct list_head *pos, *temp;
 194
 195        list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
 196                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 197                list_del(pos);
 198                kfree(addr);
 199        }
 200}
 201
 202/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 203int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
 204                              sctp_scope_t scope, gfp_t gfp, int copy_flags)
 205{
 206        struct sctp_sockaddr_entry *addr;
 207        int error = 0;
 208
 209        rcu_read_lock();
 210        list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
 211                if (!addr->valid)
 212                        continue;
 213                if (sctp_in_scope(net, &addr->a, scope)) {
 214                        /* Now that the address is in scope, check to see if
 215                         * the address type is really supported by the local
 216                         * sock as well as the remote peer.
 217                         */
 218                        if ((((AF_INET == addr->a.sa.sa_family) &&
 219                              (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 220                            (((AF_INET6 == addr->a.sa.sa_family) &&
 221                              (copy_flags & SCTP_ADDR6_ALLOWED) &&
 222                              (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 223                                error = sctp_add_bind_addr(bp, &addr->a,
 224                                                    SCTP_ADDR_SRC, GFP_ATOMIC);
 225                                if (error)
 226                                        goto end_copy;
 227                        }
 228                }
 229        }
 230
 231end_copy:
 232        rcu_read_unlock();
 233        return error;
 234}
 235
 236/* Initialize a sctp_addr from in incoming skb.  */
 237static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 238                             int is_saddr)
 239{
 240        void *from;
 241        __be16 *port;
 242        struct sctphdr *sh;
 243
 244        port = &addr->v4.sin_port;
 245        addr->v4.sin_family = AF_INET;
 246
 247        sh = sctp_hdr(skb);
 248        if (is_saddr) {
 249                *port  = sh->source;
 250                from = &ip_hdr(skb)->saddr;
 251        } else {
 252                *port = sh->dest;
 253                from = &ip_hdr(skb)->daddr;
 254        }
 255        memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 256}
 257
 258/* Initialize an sctp_addr from a socket. */
 259static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 260{
 261        addr->v4.sin_family = AF_INET;
 262        addr->v4.sin_port = 0;
 263        addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
 264}
 265
 266/* Initialize sk->sk_rcv_saddr from sctp_addr. */
 267static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 268{
 269        inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
 270}
 271
 272/* Initialize sk->sk_daddr from sctp_addr. */
 273static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 274{
 275        inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
 276}
 277
 278/* Initialize a sctp_addr from an address parameter. */
 279static void sctp_v4_from_addr_param(union sctp_addr *addr,
 280                                    union sctp_addr_param *param,
 281                                    __be16 port, int iif)
 282{
 283        addr->v4.sin_family = AF_INET;
 284        addr->v4.sin_port = port;
 285        addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 286}
 287
 288/* Initialize an address parameter from a sctp_addr and return the length
 289 * of the address parameter.
 290 */
 291static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 292                                 union sctp_addr_param *param)
 293{
 294        int length = sizeof(sctp_ipv4addr_param_t);
 295
 296        param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 297        param->v4.param_hdr.length = htons(length);
 298        param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 299
 300        return length;
 301}
 302
 303/* Initialize a sctp_addr from a dst_entry. */
 304static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
 305                              __be16 port)
 306{
 307        saddr->v4.sin_family = AF_INET;
 308        saddr->v4.sin_port = port;
 309        saddr->v4.sin_addr.s_addr = fl4->saddr;
 310}
 311
 312/* Compare two addresses exactly. */
 313static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 314                            const union sctp_addr *addr2)
 315{
 316        if (addr1->sa.sa_family != addr2->sa.sa_family)
 317                return 0;
 318        if (addr1->v4.sin_port != addr2->v4.sin_port)
 319                return 0;
 320        if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 321                return 0;
 322
 323        return 1;
 324}
 325
 326/* Initialize addr struct to INADDR_ANY. */
 327static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 328{
 329        addr->v4.sin_family = AF_INET;
 330        addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 331        addr->v4.sin_port = port;
 332}
 333
 334/* Is this a wildcard address? */
 335static int sctp_v4_is_any(const union sctp_addr *addr)
 336{
 337        return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 338}
 339
 340/* This function checks if the address is a valid address to be used for
 341 * SCTP binding.
 342 *
 343 * Output:
 344 * Return 0 - If the address is a non-unicast or an illegal address.
 345 * Return 1 - If the address is a unicast.
 346 */
 347static int sctp_v4_addr_valid(union sctp_addr *addr,
 348                              struct sctp_sock *sp,
 349                              const struct sk_buff *skb)
 350{
 351        /* IPv4 addresses not allowed */
 352        if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 353                return 0;
 354
 355        /* Is this a non-unicast address or a unusable SCTP address? */
 356        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 357                return 0;
 358
 359        /* Is this a broadcast address? */
 360        if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
 361                return 0;
 362
 363        return 1;
 364}
 365
 366/* Should this be available for binding?   */
 367static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 368{
 369        struct net *net = sock_net(&sp->inet.sk);
 370        int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
 371
 372
 373        if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 374           ret != RTN_LOCAL &&
 375           !sp->inet.freebind &&
 376           !sysctl_ip_nonlocal_bind)
 377                return 0;
 378
 379        if (ipv6_only_sock(sctp_opt2sk(sp)))
 380                return 0;
 381
 382        return 1;
 383}
 384
 385/* Checking the loopback, private and other address scopes as defined in
 386 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 387 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 388 *
 389 * Level 0 - unusable SCTP addresses
 390 * Level 1 - loopback address
 391 * Level 2 - link-local addresses
 392 * Level 3 - private addresses.
 393 * Level 4 - global addresses
 394 * For INIT and INIT-ACK address list, let L be the level of
 395 * of requested destination address, sender and receiver
 396 * SHOULD include all of its addresses with level greater
 397 * than or equal to L.
 398 *
 399 * IPv4 scoping can be controlled through sysctl option
 400 * net.sctp.addr_scope_policy
 401 */
 402static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 403{
 404        sctp_scope_t retval;
 405
 406        /* Check for unusable SCTP addresses. */
 407        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 408                retval =  SCTP_SCOPE_UNUSABLE;
 409        } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 410                retval = SCTP_SCOPE_LOOPBACK;
 411        } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 412                retval = SCTP_SCOPE_LINK;
 413        } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 414                   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 415                   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 416                retval = SCTP_SCOPE_PRIVATE;
 417        } else {
 418                retval = SCTP_SCOPE_GLOBAL;
 419        }
 420
 421        return retval;
 422}
 423
 424/* Returns a valid dst cache entry for the given source and destination ip
 425 * addresses. If an association is passed, trys to get a dst entry with a
 426 * source address that matches an address in the bind address list.
 427 */
 428static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 429                                struct flowi *fl, struct sock *sk)
 430{
 431        struct sctp_association *asoc = t->asoc;
 432        struct rtable *rt;
 433        struct flowi4 *fl4 = &fl->u.ip4;
 434        struct sctp_bind_addr *bp;
 435        struct sctp_sockaddr_entry *laddr;
 436        struct dst_entry *dst = NULL;
 437        union sctp_addr *daddr = &t->ipaddr;
 438        union sctp_addr dst_saddr;
 439
 440        memset(fl4, 0x0, sizeof(struct flowi4));
 441        fl4->daddr  = daddr->v4.sin_addr.s_addr;
 442        fl4->fl4_dport = daddr->v4.sin_port;
 443        fl4->flowi4_proto = IPPROTO_SCTP;
 444        if (asoc) {
 445                fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
 446                fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
 447                fl4->fl4_sport = htons(asoc->base.bind_addr.port);
 448        }
 449        if (saddr) {
 450                fl4->saddr = saddr->v4.sin_addr.s_addr;
 451                fl4->fl4_sport = saddr->v4.sin_port;
 452        }
 453
 454        SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
 455                          __func__, &fl4->daddr, &fl4->saddr);
 456
 457        rt = ip_route_output_key(sock_net(sk), fl4);
 458        if (!IS_ERR(rt))
 459                dst = &rt->dst;
 460
 461        /* If there is no association or if a source address is passed, no
 462         * more validation is required.
 463         */
 464        if (!asoc || saddr)
 465                goto out;
 466
 467        bp = &asoc->base.bind_addr;
 468
 469        if (dst) {
 470                /* Walk through the bind address list and look for a bind
 471                 * address that matches the source address of the returned dst.
 472                 */
 473                sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
 474                rcu_read_lock();
 475                list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 476                        if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
 477                            (laddr->state != SCTP_ADDR_SRC &&
 478                            !asoc->src_out_of_asoc_ok))
 479                                continue;
 480                        if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 481                                goto out_unlock;
 482                }
 483                rcu_read_unlock();
 484
 485                /* None of the bound addresses match the source address of the
 486                 * dst. So release it.
 487                 */
 488                dst_release(dst);
 489                dst = NULL;
 490        }
 491
 492        /* Walk through the bind address list and try to get a dst that
 493         * matches a bind address as the source address.
 494         */
 495        rcu_read_lock();
 496        list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 497                if (!laddr->valid)
 498                        continue;
 499                if ((laddr->state == SCTP_ADDR_SRC) &&
 500                    (AF_INET == laddr->a.sa.sa_family)) {
 501                        fl4->saddr = laddr->a.v4.sin_addr.s_addr;
 502                        fl4->fl4_sport = laddr->a.v4.sin_port;
 503                        rt = ip_route_output_key(sock_net(sk), fl4);
 504                        if (!IS_ERR(rt)) {
 505                                dst = &rt->dst;
 506                                goto out_unlock;
 507                        }
 508                }
 509        }
 510
 511out_unlock:
 512        rcu_read_unlock();
 513out:
 514        t->dst = dst;
 515        if (dst)
 516                SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
 517                                  &fl4->daddr, &fl4->saddr);
 518        else
 519                SCTP_DEBUG_PRINTK("NO ROUTE\n");
 520}
 521
 522/* For v4, the source address is cached in the route entry(dst). So no need
 523 * to cache it separately and hence this is an empty routine.
 524 */
 525static void sctp_v4_get_saddr(struct sctp_sock *sk,
 526                              struct sctp_transport *t,
 527                              struct flowi *fl)
 528{
 529        union sctp_addr *saddr = &t->saddr;
 530        struct rtable *rt = (struct rtable *)t->dst;
 531
 532        if (rt) {
 533                saddr->v4.sin_family = AF_INET;
 534                saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 535        }
 536}
 537
 538/* What interface did this skb arrive on? */
 539static int sctp_v4_skb_iif(const struct sk_buff *skb)
 540{
 541        return inet_iif(skb);
 542}
 543
 544/* Was this packet marked by Explicit Congestion Notification? */
 545static int sctp_v4_is_ce(const struct sk_buff *skb)
 546{
 547        return INET_ECN_is_ce(ip_hdr(skb)->tos);
 548}
 549
 550/* Create and initialize a new sk for the socket returned by accept(). */
 551static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 552                                             struct sctp_association *asoc)
 553{
 554        struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 555                        sk->sk_prot);
 556        struct inet_sock *newinet;
 557
 558        if (!newsk)
 559                goto out;
 560
 561        sock_init_data(NULL, newsk);
 562
 563        sctp_copy_sock(newsk, sk, asoc);
 564        sock_reset_flag(newsk, SOCK_ZAPPED);
 565
 566        newinet = inet_sk(newsk);
 567
 568        newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 569
 570        sk_refcnt_debug_inc(newsk);
 571
 572        if (newsk->sk_prot->init(newsk)) {
 573                sk_common_release(newsk);
 574                newsk = NULL;
 575        }
 576
 577out:
 578        return newsk;
 579}
 580
 581/* Map address, empty for v4 family */
 582static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 583{
 584        /* Empty */
 585}
 586
 587/* Dump the v4 addr to the seq file. */
 588static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 589{
 590        seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 591}
 592
 593static void sctp_v4_ecn_capable(struct sock *sk)
 594{
 595        INET_ECN_xmit(sk);
 596}
 597
 598void sctp_addr_wq_timeout_handler(unsigned long arg)
 599{
 600        struct net *net = (struct net *)arg;
 601        struct sctp_sockaddr_entry *addrw, *temp;
 602        struct sctp_sock *sp;
 603
 604        spin_lock_bh(&net->sctp.addr_wq_lock);
 605
 606        list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 607                SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
 608                    " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
 609                    addrw);
 610
 611#if IS_ENABLED(CONFIG_IPV6)
 612                /* Now we send an ASCONF for each association */
 613                /* Note. we currently don't handle link local IPv6 addressees */
 614                if (addrw->a.sa.sa_family == AF_INET6) {
 615                        struct in6_addr *in6;
 616
 617                        if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
 618                            IPV6_ADDR_LINKLOCAL)
 619                                goto free_next;
 620
 621                        in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
 622                        if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
 623                            addrw->state == SCTP_ADDR_NEW) {
 624                                unsigned long timeo_val;
 625
 626                                SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
 627                                    SCTP_ADDRESS_TICK_DELAY);
 628                                timeo_val = jiffies;
 629                                timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 630                                mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 631                                break;
 632                        }
 633                }
 634#endif
 635                list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
 636                        struct sock *sk;
 637
 638                        sk = sctp_opt2sk(sp);
 639                        /* ignore bound-specific endpoints */
 640                        if (!sctp_is_ep_boundall(sk))
 641                                continue;
 642                        sctp_bh_lock_sock(sk);
 643                        if (sctp_asconf_mgmt(sp, addrw) < 0)
 644                                SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
 645                        sctp_bh_unlock_sock(sk);
 646                }
 647#if IS_ENABLED(CONFIG_IPV6)
 648free_next:
 649#endif
 650                list_del(&addrw->list);
 651                kfree(addrw);
 652        }
 653        spin_unlock_bh(&net->sctp.addr_wq_lock);
 654}
 655
 656static void sctp_free_addr_wq(struct net *net)
 657{
 658        struct sctp_sockaddr_entry *addrw;
 659        struct sctp_sockaddr_entry *temp;
 660
 661        spin_lock_bh(&net->sctp.addr_wq_lock);
 662        del_timer(&net->sctp.addr_wq_timer);
 663        list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 664                list_del(&addrw->list);
 665                kfree(addrw);
 666        }
 667        spin_unlock_bh(&net->sctp.addr_wq_lock);
 668}
 669
 670/* lookup the entry for the same address in the addr_waitq
 671 * sctp_addr_wq MUST be locked
 672 */
 673static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
 674                                        struct sctp_sockaddr_entry *addr)
 675{
 676        struct sctp_sockaddr_entry *addrw;
 677
 678        list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
 679                if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
 680                        continue;
 681                if (addrw->a.sa.sa_family == AF_INET) {
 682                        if (addrw->a.v4.sin_addr.s_addr ==
 683                            addr->a.v4.sin_addr.s_addr)
 684                                return addrw;
 685                } else if (addrw->a.sa.sa_family == AF_INET6) {
 686                        if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
 687                            &addr->a.v6.sin6_addr))
 688                                return addrw;
 689                }
 690        }
 691        return NULL;
 692}
 693
 694void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
 695{
 696        struct sctp_sockaddr_entry *addrw;
 697        unsigned long timeo_val;
 698
 699        /* first, we check if an opposite message already exist in the queue.
 700         * If we found such message, it is removed.
 701         * This operation is a bit stupid, but the DHCP client attaches the
 702         * new address after a couple of addition and deletion of that address
 703         */
 704
 705        spin_lock_bh(&net->sctp.addr_wq_lock);
 706        /* Offsets existing events in addr_wq */
 707        addrw = sctp_addr_wq_lookup(net, addr);
 708        if (addrw) {
 709                if (addrw->state != cmd) {
 710                        SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
 711                            " in wq %p\n", addrw->state, &addrw->a,
 712                            &net->sctp.addr_waitq);
 713                        list_del(&addrw->list);
 714                        kfree(addrw);
 715                }
 716                spin_unlock_bh(&net->sctp.addr_wq_lock);
 717                return;
 718        }
 719
 720        /* OK, we have to add the new address to the wait queue */
 721        addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 722        if (addrw == NULL) {
 723                spin_unlock_bh(&net->sctp.addr_wq_lock);
 724                return;
 725        }
 726        addrw->state = cmd;
 727        list_add_tail(&addrw->list, &net->sctp.addr_waitq);
 728        SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
 729            " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
 730
 731        if (!timer_pending(&net->sctp.addr_wq_timer)) {
 732                timeo_val = jiffies;
 733                timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 734                mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 735        }
 736        spin_unlock_bh(&net->sctp.addr_wq_lock);
 737}
 738
 739/* Event handler for inet address addition/deletion events.
 740 * The sctp_local_addr_list needs to be protocted by a spin lock since
 741 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 742 * time and thus corrupt the list.
 743 * The reader side is protected with RCU.
 744 */
 745static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 746                               void *ptr)
 747{
 748        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 749        struct sctp_sockaddr_entry *addr = NULL;
 750        struct sctp_sockaddr_entry *temp;
 751        struct net *net = dev_net(ifa->ifa_dev->dev);
 752        int found = 0;
 753
 754        switch (ev) {
 755        case NETDEV_UP:
 756                addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 757                if (addr) {
 758                        addr->a.v4.sin_family = AF_INET;
 759                        addr->a.v4.sin_port = 0;
 760                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 761                        addr->valid = 1;
 762                        spin_lock_bh(&net->sctp.local_addr_lock);
 763                        list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
 764                        sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
 765                        spin_unlock_bh(&net->sctp.local_addr_lock);
 766                }
 767                break;
 768        case NETDEV_DOWN:
 769                spin_lock_bh(&net->sctp.local_addr_lock);
 770                list_for_each_entry_safe(addr, temp,
 771                                        &net->sctp.local_addr_list, list) {
 772                        if (addr->a.sa.sa_family == AF_INET &&
 773                                        addr->a.v4.sin_addr.s_addr ==
 774                                        ifa->ifa_local) {
 775                                sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
 776                                found = 1;
 777                                addr->valid = 0;
 778                                list_del_rcu(&addr->list);
 779                                break;
 780                        }
 781                }
 782                spin_unlock_bh(&net->sctp.local_addr_lock);
 783                if (found)
 784                        kfree_rcu(addr, rcu);
 785                break;
 786        }
 787
 788        return NOTIFY_DONE;
 789}
 790
 791/*
 792 * Initialize the control inode/socket with a control endpoint data
 793 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 794 */
 795static int sctp_ctl_sock_init(struct net *net)
 796{
 797        int err;
 798        sa_family_t family = PF_INET;
 799
 800        if (sctp_get_pf_specific(PF_INET6))
 801                family = PF_INET6;
 802
 803        err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
 804                                   SOCK_SEQPACKET, IPPROTO_SCTP, net);
 805
 806        /* If IPv6 socket could not be created, try the IPv4 socket */
 807        if (err < 0 && family == PF_INET6)
 808                err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
 809                                           SOCK_SEQPACKET, IPPROTO_SCTP,
 810                                           net);
 811
 812        if (err < 0) {
 813                pr_err("Failed to create the SCTP control socket\n");
 814                return err;
 815        }
 816        return 0;
 817}
 818
 819/* Register address family specific functions. */
 820int sctp_register_af(struct sctp_af *af)
 821{
 822        switch (af->sa_family) {
 823        case AF_INET:
 824                if (sctp_af_v4_specific)
 825                        return 0;
 826                sctp_af_v4_specific = af;
 827                break;
 828        case AF_INET6:
 829                if (sctp_af_v6_specific)
 830                        return 0;
 831                sctp_af_v6_specific = af;
 832                break;
 833        default:
 834                return 0;
 835        }
 836
 837        INIT_LIST_HEAD(&af->list);
 838        list_add_tail(&af->list, &sctp_address_families);
 839        return 1;
 840}
 841
 842/* Get the table of functions for manipulating a particular address
 843 * family.
 844 */
 845struct sctp_af *sctp_get_af_specific(sa_family_t family)
 846{
 847        switch (family) {
 848        case AF_INET:
 849                return sctp_af_v4_specific;
 850        case AF_INET6:
 851                return sctp_af_v6_specific;
 852        default:
 853                return NULL;
 854        }
 855}
 856
 857/* Common code to initialize a AF_INET msg_name. */
 858static void sctp_inet_msgname(char *msgname, int *addr_len)
 859{
 860        struct sockaddr_in *sin;
 861
 862        sin = (struct sockaddr_in *)msgname;
 863        *addr_len = sizeof(struct sockaddr_in);
 864        sin->sin_family = AF_INET;
 865        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 866}
 867
 868/* Copy the primary address of the peer primary address as the msg_name. */
 869static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 870                                    int *addr_len)
 871{
 872        struct sockaddr_in *sin, *sinfrom;
 873
 874        if (msgname) {
 875                struct sctp_association *asoc;
 876
 877                asoc = event->asoc;
 878                sctp_inet_msgname(msgname, addr_len);
 879                sin = (struct sockaddr_in *)msgname;
 880                sinfrom = &asoc->peer.primary_addr.v4;
 881                sin->sin_port = htons(asoc->peer.port);
 882                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 883        }
 884}
 885
 886/* Initialize and copy out a msgname from an inbound skb. */
 887static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 888{
 889        if (msgname) {
 890                struct sctphdr *sh = sctp_hdr(skb);
 891                struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 892
 893                sctp_inet_msgname(msgname, len);
 894                sin->sin_port = sh->source;
 895                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 896        }
 897}
 898
 899/* Do we support this AF? */
 900static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 901{
 902        /* PF_INET only supports AF_INET addresses. */
 903        return AF_INET == family;
 904}
 905
 906/* Address matching with wildcards allowed. */
 907static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 908                              const union sctp_addr *addr2,
 909                              struct sctp_sock *opt)
 910{
 911        /* PF_INET only supports AF_INET addresses. */
 912        if (addr1->sa.sa_family != addr2->sa.sa_family)
 913                return 0;
 914        if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 915            htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 916                return 1;
 917        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 918                return 1;
 919
 920        return 0;
 921}
 922
 923/* Verify that provided sockaddr looks bindable.  Common verification has
 924 * already been taken care of.
 925 */
 926static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 927{
 928        return sctp_v4_available(addr, opt);
 929}
 930
 931/* Verify that sockaddr looks sendable.  Common verification has already
 932 * been taken care of.
 933 */
 934static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 935{
 936        return 1;
 937}
 938
 939/* Fill in Supported Address Type information for INIT and INIT-ACK
 940 * chunks.  Returns number of addresses supported.
 941 */
 942static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 943                                     __be16 *types)
 944{
 945        types[0] = SCTP_PARAM_IPV4_ADDRESS;
 946        return 1;
 947}
 948
 949/* Wrapper routine that calls the ip transmit routine. */
 950static inline int sctp_v4_xmit(struct sk_buff *skb,
 951                               struct sctp_transport *transport)
 952{
 953        struct inet_sock *inet = inet_sk(skb->sk);
 954
 955        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 956                          __func__, skb, skb->len,
 957                          &transport->fl.u.ip4.saddr,
 958                          &transport->fl.u.ip4.daddr);
 959
 960        inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 961                         IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 962
 963        SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
 964        return ip_queue_xmit(skb, &transport->fl);
 965}
 966
 967static struct sctp_af sctp_af_inet;
 968
 969static struct sctp_pf sctp_pf_inet = {
 970        .event_msgname = sctp_inet_event_msgname,
 971        .skb_msgname   = sctp_inet_skb_msgname,
 972        .af_supported  = sctp_inet_af_supported,
 973        .cmp_addr      = sctp_inet_cmp_addr,
 974        .bind_verify   = sctp_inet_bind_verify,
 975        .send_verify   = sctp_inet_send_verify,
 976        .supported_addrs = sctp_inet_supported_addrs,
 977        .create_accept_sk = sctp_v4_create_accept_sk,
 978        .addr_v4map     = sctp_v4_addr_v4map,
 979        .af            = &sctp_af_inet
 980};
 981
 982/* Notifier for inetaddr addition/deletion events.  */
 983static struct notifier_block sctp_inetaddr_notifier = {
 984        .notifier_call = sctp_inetaddr_event,
 985};
 986
 987/* Socket operations.  */
 988static const struct proto_ops inet_seqpacket_ops = {
 989        .family            = PF_INET,
 990        .owner             = THIS_MODULE,
 991        .release           = inet_release,      /* Needs to be wrapped... */
 992        .bind              = inet_bind,
 993        .connect           = inet_dgram_connect,
 994        .socketpair        = sock_no_socketpair,
 995        .accept            = inet_accept,
 996        .getname           = inet_getname,      /* Semantics are different.  */
 997        .poll              = sctp_poll,
 998        .ioctl             = inet_ioctl,
 999        .listen            = sctp_inet_listen,
1000        .shutdown          = inet_shutdown,     /* Looks harmless.  */
1001        .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1002        .getsockopt        = sock_common_getsockopt,
1003        .sendmsg           = inet_sendmsg,
1004        .recvmsg           = sock_common_recvmsg,
1005        .mmap              = sock_no_mmap,
1006        .sendpage          = sock_no_sendpage,
1007#ifdef CONFIG_COMPAT
1008        .compat_setsockopt = compat_sock_common_setsockopt,
1009        .compat_getsockopt = compat_sock_common_getsockopt,
1010#endif
1011};
1012
1013/* Registration with AF_INET family.  */
1014static struct inet_protosw sctp_seqpacket_protosw = {
1015        .type       = SOCK_SEQPACKET,
1016        .protocol   = IPPROTO_SCTP,
1017        .prot       = &sctp_prot,
1018        .ops        = &inet_seqpacket_ops,
1019        .no_check   = 0,
1020        .flags      = SCTP_PROTOSW_FLAG
1021};
1022static struct inet_protosw sctp_stream_protosw = {
1023        .type       = SOCK_STREAM,
1024        .protocol   = IPPROTO_SCTP,
1025        .prot       = &sctp_prot,
1026        .ops        = &inet_seqpacket_ops,
1027        .no_check   = 0,
1028        .flags      = SCTP_PROTOSW_FLAG
1029};
1030
1031/* Register with IP layer.  */
1032static const struct net_protocol sctp_protocol = {
1033        .handler     = sctp_rcv,
1034        .err_handler = sctp_v4_err,
1035        .no_policy   = 1,
1036        .netns_ok    = 1,
1037};
1038
1039/* IPv4 address related functions.  */
1040static struct sctp_af sctp_af_inet = {
1041        .sa_family         = AF_INET,
1042        .sctp_xmit         = sctp_v4_xmit,
1043        .setsockopt        = ip_setsockopt,
1044        .getsockopt        = ip_getsockopt,
1045        .get_dst           = sctp_v4_get_dst,
1046        .get_saddr         = sctp_v4_get_saddr,
1047        .copy_addrlist     = sctp_v4_copy_addrlist,
1048        .from_skb          = sctp_v4_from_skb,
1049        .from_sk           = sctp_v4_from_sk,
1050        .to_sk_saddr       = sctp_v4_to_sk_saddr,
1051        .to_sk_daddr       = sctp_v4_to_sk_daddr,
1052        .from_addr_param   = sctp_v4_from_addr_param,
1053        .to_addr_param     = sctp_v4_to_addr_param,
1054        .cmp_addr          = sctp_v4_cmp_addr,
1055        .addr_valid        = sctp_v4_addr_valid,
1056        .inaddr_any        = sctp_v4_inaddr_any,
1057        .is_any            = sctp_v4_is_any,
1058        .available         = sctp_v4_available,
1059        .scope             = sctp_v4_scope,
1060        .skb_iif           = sctp_v4_skb_iif,
1061        .is_ce             = sctp_v4_is_ce,
1062        .seq_dump_addr     = sctp_v4_seq_dump_addr,
1063        .ecn_capable       = sctp_v4_ecn_capable,
1064        .net_header_len    = sizeof(struct iphdr),
1065        .sockaddr_len      = sizeof(struct sockaddr_in),
1066#ifdef CONFIG_COMPAT
1067        .compat_setsockopt = compat_ip_setsockopt,
1068        .compat_getsockopt = compat_ip_getsockopt,
1069#endif
1070};
1071
1072struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1073
1074        switch (family) {
1075        case PF_INET:
1076                return sctp_pf_inet_specific;
1077        case PF_INET6:
1078                return sctp_pf_inet6_specific;
1079        default:
1080                return NULL;
1081        }
1082}
1083
1084/* Register the PF specific function table.  */
1085int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1086{
1087        switch (family) {
1088        case PF_INET:
1089                if (sctp_pf_inet_specific)
1090                        return 0;
1091                sctp_pf_inet_specific = pf;
1092                break;
1093        case PF_INET6:
1094                if (sctp_pf_inet6_specific)
1095                        return 0;
1096                sctp_pf_inet6_specific = pf;
1097                break;
1098        default:
1099                return 0;
1100        }
1101        return 1;
1102}
1103
1104static inline int init_sctp_mibs(struct net *net)
1105{
1106        return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
1107                             sizeof(struct sctp_mib),
1108                             __alignof__(struct sctp_mib));
1109}
1110
1111static inline void cleanup_sctp_mibs(struct net *net)
1112{
1113        snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
1114}
1115
1116static void sctp_v4_pf_init(void)
1117{
1118        /* Initialize the SCTP specific PF functions. */
1119        sctp_register_pf(&sctp_pf_inet, PF_INET);
1120        sctp_register_af(&sctp_af_inet);
1121}
1122
1123static void sctp_v4_pf_exit(void)
1124{
1125        list_del(&sctp_af_inet.list);
1126}
1127
1128static int sctp_v4_protosw_init(void)
1129{
1130        int rc;
1131
1132        rc = proto_register(&sctp_prot, 1);
1133        if (rc)
1134                return rc;
1135
1136        /* Register SCTP(UDP and TCP style) with socket layer.  */
1137        inet_register_protosw(&sctp_seqpacket_protosw);
1138        inet_register_protosw(&sctp_stream_protosw);
1139
1140        return 0;
1141}
1142
1143static void sctp_v4_protosw_exit(void)
1144{
1145        inet_unregister_protosw(&sctp_stream_protosw);
1146        inet_unregister_protosw(&sctp_seqpacket_protosw);
1147        proto_unregister(&sctp_prot);
1148}
1149
1150static int sctp_v4_add_protocol(void)
1151{
1152        /* Register notifier for inet address additions/deletions. */
1153        register_inetaddr_notifier(&sctp_inetaddr_notifier);
1154
1155        /* Register SCTP with inet layer.  */
1156        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1157                return -EAGAIN;
1158
1159        return 0;
1160}
1161
1162static void sctp_v4_del_protocol(void)
1163{
1164        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1165        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1166}
1167
1168static int sctp_net_init(struct net *net)
1169{
1170        int status;
1171
1172        /*
1173         * 14. Suggested SCTP Protocol Parameter Values
1174         */
1175        /* The following protocol parameters are RECOMMENDED:  */
1176        /* RTO.Initial              - 3  seconds */
1177        net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1178        /* RTO.Min                  - 1  second */
1179        net->sctp.rto_min                       = SCTP_RTO_MIN;
1180        /* RTO.Max                 -  60 seconds */
1181        net->sctp.rto_max                       = SCTP_RTO_MAX;
1182        /* RTO.Alpha                - 1/8 */
1183        net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1184        /* RTO.Beta                 - 1/4 */
1185        net->sctp.rto_beta                      = SCTP_RTO_BETA;
1186
1187        /* Valid.Cookie.Life        - 60  seconds */
1188        net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1189
1190        /* Whether Cookie Preservative is enabled(1) or not(0) */
1191        net->sctp.cookie_preserve_enable        = 1;
1192
1193        /* Max.Burst                - 4 */
1194        net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1195
1196        /* Association.Max.Retrans  - 10 attempts
1197         * Path.Max.Retrans         - 5  attempts (per destination address)
1198         * Max.Init.Retransmits     - 8  attempts
1199         */
1200        net->sctp.max_retrans_association       = 10;
1201        net->sctp.max_retrans_path              = 5;
1202        net->sctp.max_retrans_init              = 8;
1203
1204        /* Sendbuffer growth        - do per-socket accounting */
1205        net->sctp.sndbuf_policy                 = 0;
1206
1207        /* Rcvbuffer growth         - do per-socket accounting */
1208        net->sctp.rcvbuf_policy                 = 0;
1209
1210        /* HB.interval              - 30 seconds */
1211        net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1212
1213        /* delayed SACK timeout */
1214        net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1215
1216        /* Disable ADDIP by default. */
1217        net->sctp.addip_enable = 0;
1218        net->sctp.addip_noauth = 0;
1219        net->sctp.default_auto_asconf = 0;
1220
1221        /* Enable PR-SCTP by default. */
1222        net->sctp.prsctp_enable = 1;
1223
1224        /* Disable AUTH by default. */
1225        net->sctp.auth_enable = 0;
1226
1227        /* Set SCOPE policy to enabled */
1228        net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1229
1230        /* Set the default rwnd update threshold */
1231        net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1232
1233        /* Initialize maximum autoclose timeout. */
1234        net->sctp.max_autoclose         = INT_MAX / HZ;
1235
1236        status = sctp_sysctl_net_register(net);
1237        if (status)
1238                goto err_sysctl_register;
1239
1240        /* Allocate and initialise sctp mibs.  */
1241        status = init_sctp_mibs(net);
1242        if (status)
1243                goto err_init_mibs;
1244
1245        /* Initialize proc fs directory.  */
1246        status = sctp_proc_init(net);
1247        if (status)
1248                goto err_init_proc;
1249
1250        sctp_dbg_objcnt_init(net);
1251
1252        /* Initialize the control inode/socket for handling OOTB packets.  */
1253        if ((status = sctp_ctl_sock_init(net))) {
1254                pr_err("Failed to initialize the SCTP control sock\n");
1255                goto err_ctl_sock_init;
1256        }
1257
1258        /* Initialize the local address list. */
1259        INIT_LIST_HEAD(&net->sctp.local_addr_list);
1260        spin_lock_init(&net->sctp.local_addr_lock);
1261        sctp_get_local_addr_list(net);
1262
1263        /* Initialize the address event list */
1264        INIT_LIST_HEAD(&net->sctp.addr_waitq);
1265        INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1266        spin_lock_init(&net->sctp.addr_wq_lock);
1267        net->sctp.addr_wq_timer.expires = 0;
1268        setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1269                    (unsigned long)net);
1270
1271        return 0;
1272
1273err_ctl_sock_init:
1274        sctp_dbg_objcnt_exit(net);
1275        sctp_proc_exit(net);
1276err_init_proc:
1277        cleanup_sctp_mibs(net);
1278err_init_mibs:
1279        sctp_sysctl_net_unregister(net);
1280err_sysctl_register:
1281        return status;
1282}
1283
1284static void sctp_net_exit(struct net *net)
1285{
1286        /* Free the local address list */
1287        sctp_free_addr_wq(net);
1288        sctp_free_local_addr_list(net);
1289
1290        /* Free the control endpoint.  */
1291        inet_ctl_sock_destroy(net->sctp.ctl_sock);
1292
1293        sctp_dbg_objcnt_exit(net);
1294
1295        sctp_proc_exit(net);
1296        cleanup_sctp_mibs(net);
1297        sctp_sysctl_net_unregister(net);
1298}
1299
1300static struct pernet_operations sctp_net_ops = {
1301        .init = sctp_net_init,
1302        .exit = sctp_net_exit,
1303};
1304
1305/* Initialize the universe into something sensible.  */
1306SCTP_STATIC __init int sctp_init(void)
1307{
1308        int i;
1309        int status = -EINVAL;
1310        unsigned long goal;
1311        unsigned long limit;
1312        int max_share;
1313        int order;
1314
1315        /* SCTP_DEBUG sanity check. */
1316        if (!sctp_sanity_check())
1317                goto out;
1318
1319        /* Allocate bind_bucket and chunk caches. */
1320        status = -ENOBUFS;
1321        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1322                                               sizeof(struct sctp_bind_bucket),
1323                                               0, SLAB_HWCACHE_ALIGN,
1324                                               NULL);
1325        if (!sctp_bucket_cachep)
1326                goto out;
1327
1328        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1329                                               sizeof(struct sctp_chunk),
1330                                               0, SLAB_HWCACHE_ALIGN,
1331                                               NULL);
1332        if (!sctp_chunk_cachep)
1333                goto err_chunk_cachep;
1334
1335        status = percpu_counter_init(&sctp_sockets_allocated, 0);
1336        if (status)
1337                goto err_percpu_counter_init;
1338
1339        /* Implementation specific variables. */
1340
1341        /* Initialize default stream count setup information. */
1342        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1343        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1344
1345        /* Initialize handle used for association ids. */
1346        idr_init(&sctp_assocs_id);
1347
1348        limit = nr_free_buffer_pages() / 8;
1349        limit = max(limit, 128UL);
1350        sysctl_sctp_mem[0] = limit / 4 * 3;
1351        sysctl_sctp_mem[1] = limit;
1352        sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1353
1354        /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1355        limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1356        max_share = min(4UL*1024*1024, limit);
1357
1358        sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1359        sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1360        sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1361
1362        sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1363        sysctl_sctp_wmem[1] = 16*1024;
1364        sysctl_sctp_wmem[2] = max(64*1024, max_share);
1365
1366        /* Size and allocate the association hash table.
1367         * The methodology is similar to that of the tcp hash tables.
1368         */
1369        if (totalram_pages >= (128 * 1024))
1370                goal = totalram_pages >> (22 - PAGE_SHIFT);
1371        else
1372                goal = totalram_pages >> (24 - PAGE_SHIFT);
1373
1374        for (order = 0; (1UL << order) < goal; order++)
1375                ;
1376
1377        do {
1378                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1379                                        sizeof(struct sctp_hashbucket);
1380                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1381                        continue;
1382                sctp_assoc_hashtable = (struct sctp_hashbucket *)
1383                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1384        } while (!sctp_assoc_hashtable && --order > 0);
1385        if (!sctp_assoc_hashtable) {
1386                pr_err("Failed association hash alloc\n");
1387                status = -ENOMEM;
1388                goto err_ahash_alloc;
1389        }
1390        for (i = 0; i < sctp_assoc_hashsize; i++) {
1391                rwlock_init(&sctp_assoc_hashtable[i].lock);
1392                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1393        }
1394
1395        /* Allocate and initialize the endpoint hash table.  */
1396        sctp_ep_hashsize = 64;
1397        sctp_ep_hashtable = (struct sctp_hashbucket *)
1398                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1399        if (!sctp_ep_hashtable) {
1400                pr_err("Failed endpoint_hash alloc\n");
1401                status = -ENOMEM;
1402                goto err_ehash_alloc;
1403        }
1404        for (i = 0; i < sctp_ep_hashsize; i++) {
1405                rwlock_init(&sctp_ep_hashtable[i].lock);
1406                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1407        }
1408
1409        /* Allocate and initialize the SCTP port hash table.  */
1410        do {
1411                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1412                                        sizeof(struct sctp_bind_hashbucket);
1413                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1414                        continue;
1415                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1416                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1417        } while (!sctp_port_hashtable && --order > 0);
1418        if (!sctp_port_hashtable) {
1419                pr_err("Failed bind hash alloc\n");
1420                status = -ENOMEM;
1421                goto err_bhash_alloc;
1422        }
1423        for (i = 0; i < sctp_port_hashsize; i++) {
1424                spin_lock_init(&sctp_port_hashtable[i].lock);
1425                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1426        }
1427
1428        pr_info("Hash tables configured (established %d bind %d)\n",
1429                sctp_assoc_hashsize, sctp_port_hashsize);
1430
1431        sctp_sysctl_register();
1432
1433        INIT_LIST_HEAD(&sctp_address_families);
1434        sctp_v4_pf_init();
1435        sctp_v6_pf_init();
1436
1437        status = sctp_v4_protosw_init();
1438
1439        if (status)
1440                goto err_protosw_init;
1441
1442        status = sctp_v6_protosw_init();
1443        if (status)
1444                goto err_v6_protosw_init;
1445
1446        status = register_pernet_subsys(&sctp_net_ops);
1447        if (status)
1448                goto err_register_pernet_subsys;
1449
1450        status = sctp_v4_add_protocol();
1451        if (status)
1452                goto err_add_protocol;
1453
1454        /* Register SCTP with inet6 layer.  */
1455        status = sctp_v6_add_protocol();
1456        if (status)
1457                goto err_v6_add_protocol;
1458
1459        status = 0;
1460out:
1461        return status;
1462err_v6_add_protocol:
1463        sctp_v4_del_protocol();
1464err_add_protocol:
1465        unregister_pernet_subsys(&sctp_net_ops);
1466err_register_pernet_subsys:
1467        sctp_v6_protosw_exit();
1468err_v6_protosw_init:
1469        sctp_v4_protosw_exit();
1470err_protosw_init:
1471        sctp_v4_pf_exit();
1472        sctp_v6_pf_exit();
1473        sctp_sysctl_unregister();
1474        free_pages((unsigned long)sctp_port_hashtable,
1475                   get_order(sctp_port_hashsize *
1476                             sizeof(struct sctp_bind_hashbucket)));
1477err_bhash_alloc:
1478        kfree(sctp_ep_hashtable);
1479err_ehash_alloc:
1480        free_pages((unsigned long)sctp_assoc_hashtable,
1481                   get_order(sctp_assoc_hashsize *
1482                             sizeof(struct sctp_hashbucket)));
1483err_ahash_alloc:
1484        percpu_counter_destroy(&sctp_sockets_allocated);
1485err_percpu_counter_init:
1486        kmem_cache_destroy(sctp_chunk_cachep);
1487err_chunk_cachep:
1488        kmem_cache_destroy(sctp_bucket_cachep);
1489        goto out;
1490}
1491
1492/* Exit handler for the SCTP protocol.  */
1493SCTP_STATIC __exit void sctp_exit(void)
1494{
1495        /* BUG.  This should probably do something useful like clean
1496         * up all the remaining associations and all that memory.
1497         */
1498
1499        /* Unregister with inet6/inet layers. */
1500        sctp_v6_del_protocol();
1501        sctp_v4_del_protocol();
1502
1503        unregister_pernet_subsys(&sctp_net_ops);
1504
1505        /* Free protosw registrations */
1506        sctp_v6_protosw_exit();
1507        sctp_v4_protosw_exit();
1508
1509        /* Unregister with socket layer. */
1510        sctp_v6_pf_exit();
1511        sctp_v4_pf_exit();
1512
1513        sctp_sysctl_unregister();
1514
1515        free_pages((unsigned long)sctp_assoc_hashtable,
1516                   get_order(sctp_assoc_hashsize *
1517                             sizeof(struct sctp_hashbucket)));
1518        kfree(sctp_ep_hashtable);
1519        free_pages((unsigned long)sctp_port_hashtable,
1520                   get_order(sctp_port_hashsize *
1521                             sizeof(struct sctp_bind_hashbucket)));
1522
1523        percpu_counter_destroy(&sctp_sockets_allocated);
1524
1525        rcu_barrier(); /* Wait for completion of call_rcu()'s */
1526
1527        kmem_cache_destroy(sctp_chunk_cachep);
1528        kmem_cache_destroy(sctp_bucket_cachep);
1529}
1530
1531module_init(sctp_init);
1532module_exit(sctp_exit);
1533
1534/*
1535 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1536 */
1537MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1538MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1539MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1540MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1541module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1542MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1543MODULE_LICENSE("GPL");
1544
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