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, see
  27 * <http://www.gnu.org/licenses/>.
  28 *
  29 * Please send any bug reports or fixes you make to the
  30 * email address(es):
  31 *    lksctp developers <linux-sctp@vger.kernel.org>
  32 *
  33 * Written or modified by:
  34 *    La Monte H.P. Yarroll <piggy@acm.org>
  35 *    Karl Knutson <karl@athena.chicago.il.us>
  36 *    Jon Grimm <jgrimm@us.ibm.com>
  37 *    Sridhar Samudrala <sri@us.ibm.com>
  38 *    Daisy Chang <daisyc@us.ibm.com>
  39 *    Ardelle Fan <ardelle.fan@intel.com>
  40 */
  41
  42#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  43
  44#include <linux/module.h>
  45#include <linux/init.h>
  46#include <linux/netdevice.h>
  47#include <linux/inetdevice.h>
  48#include <linux/seq_file.h>
  49#include <linux/bootmem.h>
  50#include <linux/highmem.h>
  51#include <linux/swap.h>
  52#include <linux/slab.h>
  53#include <net/net_namespace.h>
  54#include <net/protocol.h>
  55#include <net/ip.h>
  56#include <net/ipv6.h>
  57#include <net/route.h>
  58#include <net/sctp/sctp.h>
  59#include <net/addrconf.h>
  60#include <net/inet_common.h>
  61#include <net/inet_ecn.h>
  62
  63/* Global data structures. */
  64struct sctp_globals sctp_globals __read_mostly;
  65
  66struct idr sctp_assocs_id;
  67DEFINE_SPINLOCK(sctp_assocs_id_lock);
  68
  69static struct sctp_pf *sctp_pf_inet6_specific;
  70static struct sctp_pf *sctp_pf_inet_specific;
  71static struct sctp_af *sctp_af_v4_specific;
  72static struct sctp_af *sctp_af_v6_specific;
  73
  74struct kmem_cache *sctp_chunk_cachep __read_mostly;
  75struct kmem_cache *sctp_bucket_cachep __read_mostly;
  76
  77long sysctl_sctp_mem[3];
  78int sysctl_sctp_rmem[3];
  79int sysctl_sctp_wmem[3];
  80
  81/* Set up the proc fs entry for the SCTP protocol. */
  82static int __net_init sctp_proc_init(struct net *net)
  83{
  84#ifdef CONFIG_PROC_FS
  85        net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net);
  86        if (!net->sctp.proc_net_sctp)
  87                goto out_proc_net_sctp;
  88        if (sctp_snmp_proc_init(net))
  89                goto out_snmp_proc_init;
  90        if (sctp_eps_proc_init(net))
  91                goto out_eps_proc_init;
  92        if (sctp_assocs_proc_init(net))
  93                goto out_assocs_proc_init;
  94        if (sctp_remaddr_proc_init(net))
  95                goto out_remaddr_proc_init;
  96
  97        return 0;
  98
  99out_remaddr_proc_init:
 100        sctp_assocs_proc_exit(net);
 101out_assocs_proc_init:
 102        sctp_eps_proc_exit(net);
 103out_eps_proc_init:
 104        sctp_snmp_proc_exit(net);
 105out_snmp_proc_init:
 106        remove_proc_entry("sctp", net->proc_net);
 107        net->sctp.proc_net_sctp = NULL;
 108out_proc_net_sctp:
 109        return -ENOMEM;
 110#endif /* CONFIG_PROC_FS */
 111        return 0;
 112}
 113
 114/* Clean up the proc fs entry for the SCTP protocol.
 115 * Note: Do not make this __exit as it is used in the init error
 116 * path.
 117 */
 118static void sctp_proc_exit(struct net *net)
 119{
 120#ifdef CONFIG_PROC_FS
 121        sctp_snmp_proc_exit(net);
 122        sctp_eps_proc_exit(net);
 123        sctp_assocs_proc_exit(net);
 124        sctp_remaddr_proc_exit(net);
 125
 126        remove_proc_entry("sctp", net->proc_net);
 127        net->sctp.proc_net_sctp = NULL;
 128#endif
 129}
 130
 131/* Private helper to extract ipv4 address and stash them in
 132 * the protocol structure.
 133 */
 134static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 135                                  struct net_device *dev)
 136{
 137        struct in_device *in_dev;
 138        struct in_ifaddr *ifa;
 139        struct sctp_sockaddr_entry *addr;
 140
 141        rcu_read_lock();
 142        if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 143                rcu_read_unlock();
 144                return;
 145        }
 146
 147        for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 148                /* Add the address to the local list.  */
 149                addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
 150                if (addr) {
 151                        addr->a.v4.sin_family = AF_INET;
 152                        addr->a.v4.sin_port = 0;
 153                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 154                        addr->valid = 1;
 155                        INIT_LIST_HEAD(&addr->list);
 156                        list_add_tail(&addr->list, addrlist);
 157                }
 158        }
 159
 160        rcu_read_unlock();
 161}
 162
 163/* Extract our IP addresses from the system and stash them in the
 164 * protocol structure.
 165 */
 166static void sctp_get_local_addr_list(struct net *net)
 167{
 168        struct net_device *dev;
 169        struct list_head *pos;
 170        struct sctp_af *af;
 171
 172        rcu_read_lock();
 173        for_each_netdev_rcu(net, dev) {
 174                list_for_each(pos, &sctp_address_families) {
 175                        af = list_entry(pos, struct sctp_af, list);
 176                        af->copy_addrlist(&net->sctp.local_addr_list, dev);
 177                }
 178        }
 179        rcu_read_unlock();
 180}
 181
 182/* Free the existing local addresses.  */
 183static void sctp_free_local_addr_list(struct net *net)
 184{
 185        struct sctp_sockaddr_entry *addr;
 186        struct list_head *pos, *temp;
 187
 188        list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
 189                addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 190                list_del(pos);
 191                kfree(addr);
 192        }
 193}
 194
 195/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 196int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
 197                              sctp_scope_t scope, gfp_t gfp, int copy_flags)
 198{
 199        struct sctp_sockaddr_entry *addr;
 200        int error = 0;
 201
 202        rcu_read_lock();
 203        list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
 204                if (!addr->valid)
 205                        continue;
 206                if (sctp_in_scope(net, &addr->a, scope)) {
 207                        /* Now that the address is in scope, check to see if
 208                         * the address type is really supported by the local
 209                         * sock as well as the remote peer.
 210                         */
 211                        if ((((AF_INET == addr->a.sa.sa_family) &&
 212                              (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 213                            (((AF_INET6 == addr->a.sa.sa_family) &&
 214                              (copy_flags & SCTP_ADDR6_ALLOWED) &&
 215                              (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 216                                error = sctp_add_bind_addr(bp, &addr->a,
 217                                                    SCTP_ADDR_SRC, GFP_ATOMIC);
 218                                if (error)
 219                                        goto end_copy;
 220                        }
 221                }
 222        }
 223
 224end_copy:
 225        rcu_read_unlock();
 226        return error;
 227}
 228
 229/* Initialize a sctp_addr from in incoming skb.  */
 230static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 231                             int is_saddr)
 232{
 233        void *from;
 234        __be16 *port;
 235        struct sctphdr *sh;
 236
 237        port = &addr->v4.sin_port;
 238        addr->v4.sin_family = AF_INET;
 239
 240        sh = sctp_hdr(skb);
 241        if (is_saddr) {
 242                *port  = sh->source;
 243                from = &ip_hdr(skb)->saddr;
 244        } else {
 245                *port = sh->dest;
 246                from = &ip_hdr(skb)->daddr;
 247        }
 248        memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 249}
 250
 251/* Initialize an sctp_addr from a socket. */
 252static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 253{
 254        addr->v4.sin_family = AF_INET;
 255        addr->v4.sin_port = 0;
 256        addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
 257}
 258
 259/* Initialize sk->sk_rcv_saddr from sctp_addr. */
 260static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 261{
 262        inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
 263}
 264
 265/* Initialize sk->sk_daddr from sctp_addr. */
 266static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 267{
 268        inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
 269}
 270
 271/* Initialize a sctp_addr from an address parameter. */
 272static void sctp_v4_from_addr_param(union sctp_addr *addr,
 273                                    union sctp_addr_param *param,
 274                                    __be16 port, int iif)
 275{
 276        addr->v4.sin_family = AF_INET;
 277        addr->v4.sin_port = port;
 278        addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 279}
 280
 281/* Initialize an address parameter from a sctp_addr and return the length
 282 * of the address parameter.
 283 */
 284static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 285                                 union sctp_addr_param *param)
 286{
 287        int length = sizeof(sctp_ipv4addr_param_t);
 288
 289        param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 290        param->v4.param_hdr.length = htons(length);
 291        param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 292
 293        return length;
 294}
 295
 296/* Initialize a sctp_addr from a dst_entry. */
 297static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
 298                              __be16 port)
 299{
 300        saddr->v4.sin_family = AF_INET;
 301        saddr->v4.sin_port = port;
 302        saddr->v4.sin_addr.s_addr = fl4->saddr;
 303}
 304
 305/* Compare two addresses exactly. */
 306static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 307                            const union sctp_addr *addr2)
 308{
 309        if (addr1->sa.sa_family != addr2->sa.sa_family)
 310                return 0;
 311        if (addr1->v4.sin_port != addr2->v4.sin_port)
 312                return 0;
 313        if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 314                return 0;
 315
 316        return 1;
 317}
 318
 319/* Initialize addr struct to INADDR_ANY. */
 320static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 321{
 322        addr->v4.sin_family = AF_INET;
 323        addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 324        addr->v4.sin_port = port;
 325}
 326
 327/* Is this a wildcard address? */
 328static int sctp_v4_is_any(const union sctp_addr *addr)
 329{
 330        return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 331}
 332
 333/* This function checks if the address is a valid address to be used for
 334 * SCTP binding.
 335 *
 336 * Output:
 337 * Return 0 - If the address is a non-unicast or an illegal address.
 338 * Return 1 - If the address is a unicast.
 339 */
 340static int sctp_v4_addr_valid(union sctp_addr *addr,
 341                              struct sctp_sock *sp,
 342                              const struct sk_buff *skb)
 343{
 344        /* IPv4 addresses not allowed */
 345        if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 346                return 0;
 347
 348        /* Is this a non-unicast address or a unusable SCTP address? */
 349        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 350                return 0;
 351
 352        /* Is this a broadcast address? */
 353        if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
 354                return 0;
 355
 356        return 1;
 357}
 358
 359/* Should this be available for binding?   */
 360static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 361{
 362        struct net *net = sock_net(&sp->inet.sk);
 363        int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
 364
 365
 366        if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 367           ret != RTN_LOCAL &&
 368           !sp->inet.freebind &&
 369           !sysctl_ip_nonlocal_bind)
 370                return 0;
 371
 372        if (ipv6_only_sock(sctp_opt2sk(sp)))
 373                return 0;
 374
 375        return 1;
 376}
 377
 378/* Checking the loopback, private and other address scopes as defined in
 379 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 380 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 381 *
 382 * Level 0 - unusable SCTP addresses
 383 * Level 1 - loopback address
 384 * Level 2 - link-local addresses
 385 * Level 3 - private addresses.
 386 * Level 4 - global addresses
 387 * For INIT and INIT-ACK address list, let L be the level of
 388 * of requested destination address, sender and receiver
 389 * SHOULD include all of its addresses with level greater
 390 * than or equal to L.
 391 *
 392 * IPv4 scoping can be controlled through sysctl option
 393 * net.sctp.addr_scope_policy
 394 */
 395static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 396{
 397        sctp_scope_t retval;
 398
 399        /* Check for unusable SCTP addresses. */
 400        if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 401                retval =  SCTP_SCOPE_UNUSABLE;
 402        } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 403                retval = SCTP_SCOPE_LOOPBACK;
 404        } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 405                retval = SCTP_SCOPE_LINK;
 406        } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 407                   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 408                   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 409                retval = SCTP_SCOPE_PRIVATE;
 410        } else {
 411                retval = SCTP_SCOPE_GLOBAL;
 412        }
 413
 414        return retval;
 415}
 416
 417/* Returns a valid dst cache entry for the given source and destination ip
 418 * addresses. If an association is passed, trys to get a dst entry with a
 419 * source address that matches an address in the bind address list.
 420 */
 421static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 422                                struct flowi *fl, struct sock *sk)
 423{
 424        struct sctp_association *asoc = t->asoc;
 425        struct rtable *rt;
 426        struct flowi4 *fl4 = &fl->u.ip4;
 427        struct sctp_bind_addr *bp;
 428        struct sctp_sockaddr_entry *laddr;
 429        struct dst_entry *dst = NULL;
 430        union sctp_addr *daddr = &t->ipaddr;
 431        union sctp_addr dst_saddr;
 432
 433        memset(fl4, 0x0, sizeof(struct flowi4));
 434        fl4->daddr  = daddr->v4.sin_addr.s_addr;
 435        fl4->fl4_dport = daddr->v4.sin_port;
 436        fl4->flowi4_proto = IPPROTO_SCTP;
 437        if (asoc) {
 438                fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
 439                fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
 440                fl4->fl4_sport = htons(asoc->base.bind_addr.port);
 441        }
 442        if (saddr) {
 443                fl4->saddr = saddr->v4.sin_addr.s_addr;
 444                fl4->fl4_sport = saddr->v4.sin_port;
 445        }
 446
 447        pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
 448                 &fl4->saddr);
 449
 450        rt = ip_route_output_key(sock_net(sk), fl4);
 451        if (!IS_ERR(rt))
 452                dst = &rt->dst;
 453
 454        /* If there is no association or if a source address is passed, no
 455         * more validation is required.
 456         */
 457        if (!asoc || saddr)
 458                goto out;
 459
 460        bp = &asoc->base.bind_addr;
 461
 462        if (dst) {
 463                /* Walk through the bind address list and look for a bind
 464                 * address that matches the source address of the returned dst.
 465                 */
 466                sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
 467                rcu_read_lock();
 468                list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 469                        if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
 470                            (laddr->state != SCTP_ADDR_SRC &&
 471                            !asoc->src_out_of_asoc_ok))
 472                                continue;
 473                        if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 474                                goto out_unlock;
 475                }
 476                rcu_read_unlock();
 477
 478                /* None of the bound addresses match the source address of the
 479                 * dst. So release it.
 480                 */
 481                dst_release(dst);
 482                dst = NULL;
 483        }
 484
 485        /* Walk through the bind address list and try to get a dst that
 486         * matches a bind address as the source address.
 487         */
 488        rcu_read_lock();
 489        list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 490                if (!laddr->valid)
 491                        continue;
 492                if ((laddr->state == SCTP_ADDR_SRC) &&
 493                    (AF_INET == laddr->a.sa.sa_family)) {
 494                        fl4->fl4_sport = laddr->a.v4.sin_port;
 495                        flowi4_update_output(fl4,
 496                                             asoc->base.sk->sk_bound_dev_if,
 497                                             RT_CONN_FLAGS(asoc->base.sk),
 498                                             daddr->v4.sin_addr.s_addr,
 499                                             laddr->a.v4.sin_addr.s_addr);
 500
 501                        rt = ip_route_output_key(sock_net(sk), fl4);
 502                        if (!IS_ERR(rt)) {
 503                                dst = &rt->dst;
 504                                goto out_unlock;
 505                        }
 506                }
 507        }
 508
 509out_unlock:
 510        rcu_read_unlock();
 511out:
 512        t->dst = dst;
 513        if (dst)
 514                pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
 515                         &fl4->daddr, &fl4->saddr);
 516        else
 517                pr_debug("no route\n");
 518}
 519
 520/* For v4, the source address is cached in the route entry(dst). So no need
 521 * to cache it separately and hence this is an empty routine.
 522 */
 523static void sctp_v4_get_saddr(struct sctp_sock *sk,
 524                              struct sctp_transport *t,
 525                              struct flowi *fl)
 526{
 527        union sctp_addr *saddr = &t->saddr;
 528        struct rtable *rt = (struct rtable *)t->dst;
 529
 530        if (rt) {
 531                saddr->v4.sin_family = AF_INET;
 532                saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 533        }
 534}
 535
 536/* What interface did this skb arrive on? */
 537static int sctp_v4_skb_iif(const struct sk_buff *skb)
 538{
 539        return inet_iif(skb);
 540}
 541
 542/* Was this packet marked by Explicit Congestion Notification? */
 543static int sctp_v4_is_ce(const struct sk_buff *skb)
 544{
 545        return INET_ECN_is_ce(ip_hdr(skb)->tos);
 546}
 547
 548/* Create and initialize a new sk for the socket returned by accept(). */
 549static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 550                                             struct sctp_association *asoc)
 551{
 552        struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 553                        sk->sk_prot);
 554        struct inet_sock *newinet;
 555
 556        if (!newsk)
 557                goto out;
 558
 559        sock_init_data(NULL, newsk);
 560
 561        sctp_copy_sock(newsk, sk, asoc);
 562        sock_reset_flag(newsk, SOCK_ZAPPED);
 563
 564        newinet = inet_sk(newsk);
 565
 566        newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 567
 568        sk_refcnt_debug_inc(newsk);
 569
 570        if (newsk->sk_prot->init(newsk)) {
 571                sk_common_release(newsk);
 572                newsk = NULL;
 573        }
 574
 575out:
 576        return newsk;
 577}
 578
 579/* Map address, empty for v4 family */
 580static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 581{
 582        /* Empty */
 583}
 584
 585/* Dump the v4 addr to the seq file. */
 586static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 587{
 588        seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 589}
 590
 591static void sctp_v4_ecn_capable(struct sock *sk)
 592{
 593        INET_ECN_xmit(sk);
 594}
 595
 596static void sctp_addr_wq_timeout_handler(unsigned long arg)
 597{
 598        struct net *net = (struct net *)arg;
 599        struct sctp_sockaddr_entry *addrw, *temp;
 600        struct sctp_sock *sp;
 601
 602        spin_lock_bh(&net->sctp.addr_wq_lock);
 603
 604        list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 605                pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
 606                         "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
 607                         addrw->state, addrw);
 608
 609#if IS_ENABLED(CONFIG_IPV6)
 610                /* Now we send an ASCONF for each association */
 611                /* Note. we currently don't handle link local IPv6 addressees */
 612                if (addrw->a.sa.sa_family == AF_INET6) {
 613                        struct in6_addr *in6;
 614
 615                        if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
 616                            IPV6_ADDR_LINKLOCAL)
 617                                goto free_next;
 618
 619                        in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
 620                        if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
 621                            addrw->state == SCTP_ADDR_NEW) {
 622                                unsigned long timeo_val;
 623
 624                                pr_debug("%s: this is on DAD, trying %d sec "
 625                                         "later\n", __func__,
 626                                         SCTP_ADDRESS_TICK_DELAY);
 627
 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                        bh_lock_sock(sk);
 643                        if (sctp_asconf_mgmt(sp, addrw) < 0)
 644                                pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
 645                        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                        pr_debug("%s: offsets existing entry for %d, addr:%pISc "
 711                                 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
 712                                 &net->sctp.addr_waitq);
 713
 714                        list_del(&addrw->list);
 715                        kfree(addrw);
 716                }
 717                spin_unlock_bh(&net->sctp.addr_wq_lock);
 718                return;
 719        }
 720
 721        /* OK, we have to add the new address to the wait queue */
 722        addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 723        if (addrw == NULL) {
 724                spin_unlock_bh(&net->sctp.addr_wq_lock);
 725                return;
 726        }
 727        addrw->state = cmd;
 728        list_add_tail(&addrw->list, &net->sctp.addr_waitq);
 729
 730        pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
 731                 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
 732
 733        if (!timer_pending(&net->sctp.addr_wq_timer)) {
 734                timeo_val = jiffies;
 735                timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 736                mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 737        }
 738        spin_unlock_bh(&net->sctp.addr_wq_lock);
 739}
 740
 741/* Event handler for inet address addition/deletion events.
 742 * The sctp_local_addr_list needs to be protocted by a spin lock since
 743 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 744 * time and thus corrupt the list.
 745 * The reader side is protected with RCU.
 746 */
 747static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 748                               void *ptr)
 749{
 750        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 751        struct sctp_sockaddr_entry *addr = NULL;
 752        struct sctp_sockaddr_entry *temp;
 753        struct net *net = dev_net(ifa->ifa_dev->dev);
 754        int found = 0;
 755
 756        switch (ev) {
 757        case NETDEV_UP:
 758                addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 759                if (addr) {
 760                        addr->a.v4.sin_family = AF_INET;
 761                        addr->a.v4.sin_port = 0;
 762                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 763                        addr->valid = 1;
 764                        spin_lock_bh(&net->sctp.local_addr_lock);
 765                        list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
 766                        sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
 767                        spin_unlock_bh(&net->sctp.local_addr_lock);
 768                }
 769                break;
 770        case NETDEV_DOWN:
 771                spin_lock_bh(&net->sctp.local_addr_lock);
 772                list_for_each_entry_safe(addr, temp,
 773                                        &net->sctp.local_addr_list, list) {
 774                        if (addr->a.sa.sa_family == AF_INET &&
 775                                        addr->a.v4.sin_addr.s_addr ==
 776                                        ifa->ifa_local) {
 777                                sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
 778                                found = 1;
 779                                addr->valid = 0;
 780                                list_del_rcu(&addr->list);
 781                                break;
 782                        }
 783                }
 784                spin_unlock_bh(&net->sctp.local_addr_lock);
 785                if (found)
 786                        kfree_rcu(addr, rcu);
 787                break;
 788        }
 789
 790        return NOTIFY_DONE;
 791}
 792
 793/*
 794 * Initialize the control inode/socket with a control endpoint data
 795 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 796 */
 797static int sctp_ctl_sock_init(struct net *net)
 798{
 799        int err;
 800        sa_family_t family = PF_INET;
 801
 802        if (sctp_get_pf_specific(PF_INET6))
 803                family = PF_INET6;
 804
 805        err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
 806                                   SOCK_SEQPACKET, IPPROTO_SCTP, net);
 807
 808        /* If IPv6 socket could not be created, try the IPv4 socket */
 809        if (err < 0 && family == PF_INET6)
 810                err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
 811                                           SOCK_SEQPACKET, IPPROTO_SCTP,
 812                                           net);
 813
 814        if (err < 0) {
 815                pr_err("Failed to create the SCTP control socket\n");
 816                return err;
 817        }
 818        return 0;
 819}
 820
 821/* Register address family specific functions. */
 822int sctp_register_af(struct sctp_af *af)
 823{
 824        switch (af->sa_family) {
 825        case AF_INET:
 826                if (sctp_af_v4_specific)
 827                        return 0;
 828                sctp_af_v4_specific = af;
 829                break;
 830        case AF_INET6:
 831                if (sctp_af_v6_specific)
 832                        return 0;
 833                sctp_af_v6_specific = af;
 834                break;
 835        default:
 836                return 0;
 837        }
 838
 839        INIT_LIST_HEAD(&af->list);
 840        list_add_tail(&af->list, &sctp_address_families);
 841        return 1;
 842}
 843
 844/* Get the table of functions for manipulating a particular address
 845 * family.
 846 */
 847struct sctp_af *sctp_get_af_specific(sa_family_t family)
 848{
 849        switch (family) {
 850        case AF_INET:
 851                return sctp_af_v4_specific;
 852        case AF_INET6:
 853                return sctp_af_v6_specific;
 854        default:
 855                return NULL;
 856        }
 857}
 858
 859/* Common code to initialize a AF_INET msg_name. */
 860static void sctp_inet_msgname(char *msgname, int *addr_len)
 861{
 862        struct sockaddr_in *sin;
 863
 864        sin = (struct sockaddr_in *)msgname;
 865        *addr_len = sizeof(struct sockaddr_in);
 866        sin->sin_family = AF_INET;
 867        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 868}
 869
 870/* Copy the primary address of the peer primary address as the msg_name. */
 871static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 872                                    int *addr_len)
 873{
 874        struct sockaddr_in *sin, *sinfrom;
 875
 876        if (msgname) {
 877                struct sctp_association *asoc;
 878
 879                asoc = event->asoc;
 880                sctp_inet_msgname(msgname, addr_len);
 881                sin = (struct sockaddr_in *)msgname;
 882                sinfrom = &asoc->peer.primary_addr.v4;
 883                sin->sin_port = htons(asoc->peer.port);
 884                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 885        }
 886}
 887
 888/* Initialize and copy out a msgname from an inbound skb. */
 889static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 890{
 891        if (msgname) {
 892                struct sctphdr *sh = sctp_hdr(skb);
 893                struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 894
 895                sctp_inet_msgname(msgname, len);
 896                sin->sin_port = sh->source;
 897                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 898        }
 899}
 900
 901/* Do we support this AF? */
 902static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 903{
 904        /* PF_INET only supports AF_INET addresses. */
 905        return AF_INET == family;
 906}
 907
 908/* Address matching with wildcards allowed. */
 909static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 910                              const union sctp_addr *addr2,
 911                              struct sctp_sock *opt)
 912{
 913        /* PF_INET only supports AF_INET addresses. */
 914        if (addr1->sa.sa_family != addr2->sa.sa_family)
 915                return 0;
 916        if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 917            htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 918                return 1;
 919        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 920                return 1;
 921
 922        return 0;
 923}
 924
 925/* Verify that provided sockaddr looks bindable.  Common verification has
 926 * already been taken care of.
 927 */
 928static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 929{
 930        return sctp_v4_available(addr, opt);
 931}
 932
 933/* Verify that sockaddr looks sendable.  Common verification has already
 934 * been taken care of.
 935 */
 936static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 937{
 938        return 1;
 939}
 940
 941/* Fill in Supported Address Type information for INIT and INIT-ACK
 942 * chunks.  Returns number of addresses supported.
 943 */
 944static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 945                                     __be16 *types)
 946{
 947        types[0] = SCTP_PARAM_IPV4_ADDRESS;
 948        return 1;
 949}
 950
 951/* Wrapper routine that calls the ip transmit routine. */
 952static inline int sctp_v4_xmit(struct sk_buff *skb,
 953                               struct sctp_transport *transport)
 954{
 955        struct inet_sock *inet = inet_sk(skb->sk);
 956
 957        pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
 958                 skb->len, &transport->fl.u.ip4.saddr, &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
 965        return ip_queue_xmit(&inet->sk, skb, &transport->fl);
 966}
 967
 968static struct sctp_af sctp_af_inet;
 969
 970static struct sctp_pf sctp_pf_inet = {
 971        .event_msgname = sctp_inet_event_msgname,
 972        .skb_msgname   = sctp_inet_skb_msgname,
 973        .af_supported  = sctp_inet_af_supported,
 974        .cmp_addr      = sctp_inet_cmp_addr,
 975        .bind_verify   = sctp_inet_bind_verify,
 976        .send_verify   = sctp_inet_send_verify,
 977        .supported_addrs = sctp_inet_supported_addrs,
 978        .create_accept_sk = sctp_v4_create_accept_sk,
 979        .addr_v4map     = sctp_v4_addr_v4map,
 980        .af            = &sctp_af_inet
 981};
 982
 983/* Notifier for inetaddr addition/deletion events.  */
 984static struct notifier_block sctp_inetaddr_notifier = {
 985        .notifier_call = sctp_inetaddr_event,
 986};
 987
 988/* Socket operations.  */
 989static const struct proto_ops inet_seqpacket_ops = {
 990        .family            = PF_INET,
 991        .owner             = THIS_MODULE,
 992        .release           = inet_release,      /* Needs to be wrapped... */
 993        .bind              = inet_bind,
 994        .connect           = inet_dgram_connect,
 995        .socketpair        = sock_no_socketpair,
 996        .accept            = inet_accept,
 997        .getname           = inet_getname,      /* Semantics are different.  */
 998        .poll              = sctp_poll,
 999        .ioctl             = inet_ioctl,
1000        .listen            = sctp_inet_listen,
1001        .shutdown          = inet_shutdown,     /* Looks harmless.  */
1002        .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1003        .getsockopt        = sock_common_getsockopt,
1004        .sendmsg           = inet_sendmsg,
1005        .recvmsg           = sock_common_recvmsg,
1006        .mmap              = sock_no_mmap,
1007        .sendpage          = sock_no_sendpage,
1008#ifdef CONFIG_COMPAT
1009        .compat_setsockopt = compat_sock_common_setsockopt,
1010        .compat_getsockopt = compat_sock_common_getsockopt,
1011#endif
1012};
1013
1014/* Registration with AF_INET family.  */
1015static struct inet_protosw sctp_seqpacket_protosw = {
1016        .type       = SOCK_SEQPACKET,
1017        .protocol   = IPPROTO_SCTP,
1018        .prot       = &sctp_prot,
1019        .ops        = &inet_seqpacket_ops,
1020        .no_check   = 0,
1021        .flags      = SCTP_PROTOSW_FLAG
1022};
1023static struct inet_protosw sctp_stream_protosw = {
1024        .type       = SOCK_STREAM,
1025        .protocol   = IPPROTO_SCTP,
1026        .prot       = &sctp_prot,
1027        .ops        = &inet_seqpacket_ops,
1028        .no_check   = 0,
1029        .flags      = SCTP_PROTOSW_FLAG
1030};
1031
1032/* Register with IP layer.  */
1033static const struct net_protocol sctp_protocol = {
1034        .handler     = sctp_rcv,
1035        .err_handler = sctp_v4_err,
1036        .no_policy   = 1,
1037        .netns_ok    = 1,
1038        .icmp_strict_tag_validation = 1,
1039};
1040
1041/* IPv4 address related functions.  */
1042static struct sctp_af sctp_af_inet = {
1043        .sa_family         = AF_INET,
1044        .sctp_xmit         = sctp_v4_xmit,
1045        .setsockopt        = ip_setsockopt,
1046        .getsockopt        = ip_getsockopt,
1047        .get_dst           = sctp_v4_get_dst,
1048        .get_saddr         = sctp_v4_get_saddr,
1049        .copy_addrlist     = sctp_v4_copy_addrlist,
1050        .from_skb          = sctp_v4_from_skb,
1051        .from_sk           = sctp_v4_from_sk,
1052        .to_sk_saddr       = sctp_v4_to_sk_saddr,
1053        .to_sk_daddr       = sctp_v4_to_sk_daddr,
1054        .from_addr_param   = sctp_v4_from_addr_param,
1055        .to_addr_param     = sctp_v4_to_addr_param,
1056        .cmp_addr          = sctp_v4_cmp_addr,
1057        .addr_valid        = sctp_v4_addr_valid,
1058        .inaddr_any        = sctp_v4_inaddr_any,
1059        .is_any            = sctp_v4_is_any,
1060        .available         = sctp_v4_available,
1061        .scope             = sctp_v4_scope,
1062        .skb_iif           = sctp_v4_skb_iif,
1063        .is_ce             = sctp_v4_is_ce,
1064        .seq_dump_addr     = sctp_v4_seq_dump_addr,
1065        .ecn_capable       = sctp_v4_ecn_capable,
1066        .net_header_len    = sizeof(struct iphdr),
1067        .sockaddr_len      = sizeof(struct sockaddr_in),
1068#ifdef CONFIG_COMPAT
1069        .compat_setsockopt = compat_ip_setsockopt,
1070        .compat_getsockopt = compat_ip_getsockopt,
1071#endif
1072};
1073
1074struct sctp_pf *sctp_get_pf_specific(sa_family_t family)
1075{
1076        switch (family) {
1077        case PF_INET:
1078                return sctp_pf_inet_specific;
1079        case PF_INET6:
1080                return sctp_pf_inet6_specific;
1081        default:
1082                return NULL;
1083        }
1084}
1085
1086/* Register the PF specific function table.  */
1087int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1088{
1089        switch (family) {
1090        case PF_INET:
1091                if (sctp_pf_inet_specific)
1092                        return 0;
1093                sctp_pf_inet_specific = pf;
1094                break;
1095        case PF_INET6:
1096                if (sctp_pf_inet6_specific)
1097                        return 0;
1098                sctp_pf_inet6_specific = pf;
1099                break;
1100        default:
1101                return 0;
1102        }
1103        return 1;
1104}
1105
1106static inline int init_sctp_mibs(struct net *net)
1107{
1108        return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
1109                             sizeof(struct sctp_mib),
1110                             __alignof__(struct sctp_mib));
1111}
1112
1113static inline void cleanup_sctp_mibs(struct net *net)
1114{
1115        snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
1116}
1117
1118static void sctp_v4_pf_init(void)
1119{
1120        /* Initialize the SCTP specific PF functions. */
1121        sctp_register_pf(&sctp_pf_inet, PF_INET);
1122        sctp_register_af(&sctp_af_inet);
1123}
1124
1125static void sctp_v4_pf_exit(void)
1126{
1127        list_del(&sctp_af_inet.list);
1128}
1129
1130static int sctp_v4_protosw_init(void)
1131{
1132        int rc;
1133
1134        rc = proto_register(&sctp_prot, 1);
1135        if (rc)
1136                return rc;
1137
1138        /* Register SCTP(UDP and TCP style) with socket layer.  */
1139        inet_register_protosw(&sctp_seqpacket_protosw);
1140        inet_register_protosw(&sctp_stream_protosw);
1141
1142        return 0;
1143}
1144
1145static void sctp_v4_protosw_exit(void)
1146{
1147        inet_unregister_protosw(&sctp_stream_protosw);
1148        inet_unregister_protosw(&sctp_seqpacket_protosw);
1149        proto_unregister(&sctp_prot);
1150}
1151
1152static int sctp_v4_add_protocol(void)
1153{
1154        /* Register notifier for inet address additions/deletions. */
1155        register_inetaddr_notifier(&sctp_inetaddr_notifier);
1156
1157        /* Register SCTP with inet layer.  */
1158        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1159                return -EAGAIN;
1160
1161        return 0;
1162}
1163
1164static void sctp_v4_del_protocol(void)
1165{
1166        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1167        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1168}
1169
1170static int __net_init sctp_net_init(struct net *net)
1171{
1172        int status;
1173
1174        /*
1175         * 14. Suggested SCTP Protocol Parameter Values
1176         */
1177        /* The following protocol parameters are RECOMMENDED:  */
1178        /* RTO.Initial              - 3  seconds */
1179        net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1180        /* RTO.Min                  - 1  second */
1181        net->sctp.rto_min                       = SCTP_RTO_MIN;
1182        /* RTO.Max                 -  60 seconds */
1183        net->sctp.rto_max                       = SCTP_RTO_MAX;
1184        /* RTO.Alpha                - 1/8 */
1185        net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1186        /* RTO.Beta                 - 1/4 */
1187        net->sctp.rto_beta                      = SCTP_RTO_BETA;
1188
1189        /* Valid.Cookie.Life        - 60  seconds */
1190        net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1191
1192        /* Whether Cookie Preservative is enabled(1) or not(0) */
1193        net->sctp.cookie_preserve_enable        = 1;
1194
1195        /* Default sctp sockets to use md5 as their hmac alg */
1196#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1197        net->sctp.sctp_hmac_alg                 = "md5";
1198#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1199        net->sctp.sctp_hmac_alg                 = "sha1";
1200#else
1201        net->sctp.sctp_hmac_alg                 = NULL;
1202#endif
1203
1204        /* Max.Burst                - 4 */
1205        net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1206
1207        /* Association.Max.Retrans  - 10 attempts
1208         * Path.Max.Retrans         - 5  attempts (per destination address)
1209         * Max.Init.Retransmits     - 8  attempts
1210         */
1211        net->sctp.max_retrans_association       = 10;
1212        net->sctp.max_retrans_path              = 5;
1213        net->sctp.max_retrans_init              = 8;
1214
1215        /* Sendbuffer growth        - do per-socket accounting */
1216        net->sctp.sndbuf_policy                 = 0;
1217
1218        /* Rcvbuffer growth         - do per-socket accounting */
1219        net->sctp.rcvbuf_policy                 = 0;
1220
1221        /* HB.interval              - 30 seconds */
1222        net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1223
1224        /* delayed SACK timeout */
1225        net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1226
1227        /* Disable ADDIP by default. */
1228        net->sctp.addip_enable = 0;
1229        net->sctp.addip_noauth = 0;
1230        net->sctp.default_auto_asconf = 0;
1231
1232        /* Enable PR-SCTP by default. */
1233        net->sctp.prsctp_enable = 1;
1234
1235        /* Disable AUTH by default. */
1236        net->sctp.auth_enable = 0;
1237
1238        /* Set SCOPE policy to enabled */
1239        net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1240
1241        /* Set the default rwnd update threshold */
1242        net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1243
1244        /* Initialize maximum autoclose timeout. */
1245        net->sctp.max_autoclose         = INT_MAX / HZ;
1246
1247        status = sctp_sysctl_net_register(net);
1248        if (status)
1249                goto err_sysctl_register;
1250
1251        /* Allocate and initialise sctp mibs.  */
1252        status = init_sctp_mibs(net);
1253        if (status)
1254                goto err_init_mibs;
1255
1256        /* Initialize proc fs directory.  */
1257        status = sctp_proc_init(net);
1258        if (status)
1259                goto err_init_proc;
1260
1261        sctp_dbg_objcnt_init(net);
1262
1263        /* Initialize the control inode/socket for handling OOTB packets.  */
1264        if ((status = sctp_ctl_sock_init(net))) {
1265                pr_err("Failed to initialize the SCTP control sock\n");
1266                goto err_ctl_sock_init;
1267        }
1268
1269        /* Initialize the local address list. */
1270        INIT_LIST_HEAD(&net->sctp.local_addr_list);
1271        spin_lock_init(&net->sctp.local_addr_lock);
1272        sctp_get_local_addr_list(net);
1273
1274        /* Initialize the address event list */
1275        INIT_LIST_HEAD(&net->sctp.addr_waitq);
1276        INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1277        spin_lock_init(&net->sctp.addr_wq_lock);
1278        net->sctp.addr_wq_timer.expires = 0;
1279        setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1280                    (unsigned long)net);
1281
1282        return 0;
1283
1284err_ctl_sock_init:
1285        sctp_dbg_objcnt_exit(net);
1286        sctp_proc_exit(net);
1287err_init_proc:
1288        cleanup_sctp_mibs(net);
1289err_init_mibs:
1290        sctp_sysctl_net_unregister(net);
1291err_sysctl_register:
1292        return status;
1293}
1294
1295static void __net_exit sctp_net_exit(struct net *net)
1296{
1297        /* Free the local address list */
1298        sctp_free_addr_wq(net);
1299        sctp_free_local_addr_list(net);
1300
1301        /* Free the control endpoint.  */
1302        inet_ctl_sock_destroy(net->sctp.ctl_sock);
1303
1304        sctp_dbg_objcnt_exit(net);
1305
1306        sctp_proc_exit(net);
1307        cleanup_sctp_mibs(net);
1308        sctp_sysctl_net_unregister(net);
1309}
1310
1311static struct pernet_operations sctp_net_ops = {
1312        .init = sctp_net_init,
1313        .exit = sctp_net_exit,
1314};
1315
1316/* Initialize the universe into something sensible.  */
1317static __init int sctp_init(void)
1318{
1319        int i;
1320        int status = -EINVAL;
1321        unsigned long goal;
1322        unsigned long limit;
1323        int max_share;
1324        int order;
1325
1326        BUILD_BUG_ON(sizeof(struct sctp_ulpevent) >
1327                     sizeof(((struct sk_buff *) 0)->cb));
1328
1329        /* Allocate bind_bucket and chunk caches. */
1330        status = -ENOBUFS;
1331        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1332                                               sizeof(struct sctp_bind_bucket),
1333                                               0, SLAB_HWCACHE_ALIGN,
1334                                               NULL);
1335        if (!sctp_bucket_cachep)
1336                goto out;
1337
1338        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1339                                               sizeof(struct sctp_chunk),
1340                                               0, SLAB_HWCACHE_ALIGN,
1341                                               NULL);
1342        if (!sctp_chunk_cachep)
1343                goto err_chunk_cachep;
1344
1345        status = percpu_counter_init(&sctp_sockets_allocated, 0);
1346        if (status)
1347                goto err_percpu_counter_init;
1348
1349        /* Implementation specific variables. */
1350
1351        /* Initialize default stream count setup information. */
1352        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1353        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1354
1355        /* Initialize handle used for association ids. */
1356        idr_init(&sctp_assocs_id);
1357
1358        limit = nr_free_buffer_pages() / 8;
1359        limit = max(limit, 128UL);
1360        sysctl_sctp_mem[0] = limit / 4 * 3;
1361        sysctl_sctp_mem[1] = limit;
1362        sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1363
1364        /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1365        limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1366        max_share = min(4UL*1024*1024, limit);
1367
1368        sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1369        sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1370        sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1371
1372        sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1373        sysctl_sctp_wmem[1] = 16*1024;
1374        sysctl_sctp_wmem[2] = max(64*1024, max_share);
1375
1376        /* Size and allocate the association hash table.
1377         * The methodology is similar to that of the tcp hash tables.
1378         */
1379        if (totalram_pages >= (128 * 1024))
1380                goal = totalram_pages >> (22 - PAGE_SHIFT);
1381        else
1382                goal = totalram_pages >> (24 - PAGE_SHIFT);
1383
1384        for (order = 0; (1UL << order) < goal; order++)
1385                ;
1386
1387        do {
1388                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1389                                        sizeof(struct sctp_hashbucket);
1390                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1391                        continue;
1392                sctp_assoc_hashtable = (struct sctp_hashbucket *)
1393                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1394        } while (!sctp_assoc_hashtable && --order > 0);
1395        if (!sctp_assoc_hashtable) {
1396                pr_err("Failed association hash alloc\n");
1397                status = -ENOMEM;
1398                goto err_ahash_alloc;
1399        }
1400        for (i = 0; i < sctp_assoc_hashsize; i++) {
1401                rwlock_init(&sctp_assoc_hashtable[i].lock);
1402                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1403        }
1404
1405        /* Allocate and initialize the endpoint hash table.  */
1406        sctp_ep_hashsize = 64;
1407        sctp_ep_hashtable =
1408                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1409        if (!sctp_ep_hashtable) {
1410                pr_err("Failed endpoint_hash alloc\n");
1411                status = -ENOMEM;
1412                goto err_ehash_alloc;
1413        }
1414        for (i = 0; i < sctp_ep_hashsize; i++) {
1415                rwlock_init(&sctp_ep_hashtable[i].lock);
1416                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1417        }
1418
1419        /* Allocate and initialize the SCTP port hash table.  */
1420        do {
1421                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1422                                        sizeof(struct sctp_bind_hashbucket);
1423                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1424                        continue;
1425                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1426                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1427        } while (!sctp_port_hashtable && --order > 0);
1428        if (!sctp_port_hashtable) {
1429                pr_err("Failed bind hash alloc\n");
1430                status = -ENOMEM;
1431                goto err_bhash_alloc;
1432        }
1433        for (i = 0; i < sctp_port_hashsize; i++) {
1434                spin_lock_init(&sctp_port_hashtable[i].lock);
1435                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1436        }
1437
1438        pr_info("Hash tables configured (established %d bind %d)\n",
1439                sctp_assoc_hashsize, sctp_port_hashsize);
1440
1441        sctp_sysctl_register();
1442
1443        INIT_LIST_HEAD(&sctp_address_families);
1444        sctp_v4_pf_init();
1445        sctp_v6_pf_init();
1446
1447        status = sctp_v4_protosw_init();
1448
1449        if (status)
1450                goto err_protosw_init;
1451
1452        status = sctp_v6_protosw_init();
1453        if (status)
1454                goto err_v6_protosw_init;
1455
1456        status = register_pernet_subsys(&sctp_net_ops);
1457        if (status)
1458                goto err_register_pernet_subsys;
1459
1460        status = sctp_v4_add_protocol();
1461        if (status)
1462                goto err_add_protocol;
1463
1464        /* Register SCTP with inet6 layer.  */
1465        status = sctp_v6_add_protocol();
1466        if (status)
1467                goto err_v6_add_protocol;
1468
1469out:
1470        return status;
1471err_v6_add_protocol:
1472        sctp_v4_del_protocol();
1473err_add_protocol:
1474        unregister_pernet_subsys(&sctp_net_ops);
1475err_register_pernet_subsys:
1476        sctp_v6_protosw_exit();
1477err_v6_protosw_init:
1478        sctp_v4_protosw_exit();
1479err_protosw_init:
1480        sctp_v4_pf_exit();
1481        sctp_v6_pf_exit();
1482        sctp_sysctl_unregister();
1483        free_pages((unsigned long)sctp_port_hashtable,
1484                   get_order(sctp_port_hashsize *
1485                             sizeof(struct sctp_bind_hashbucket)));
1486err_bhash_alloc:
1487        kfree(sctp_ep_hashtable);
1488err_ehash_alloc:
1489        free_pages((unsigned long)sctp_assoc_hashtable,
1490                   get_order(sctp_assoc_hashsize *
1491                             sizeof(struct sctp_hashbucket)));
1492err_ahash_alloc:
1493        percpu_counter_destroy(&sctp_sockets_allocated);
1494err_percpu_counter_init:
1495        kmem_cache_destroy(sctp_chunk_cachep);
1496err_chunk_cachep:
1497        kmem_cache_destroy(sctp_bucket_cachep);
1498        goto out;
1499}
1500
1501/* Exit handler for the SCTP protocol.  */
1502static __exit void sctp_exit(void)
1503{
1504        /* BUG.  This should probably do something useful like clean
1505         * up all the remaining associations and all that memory.
1506         */
1507
1508        /* Unregister with inet6/inet layers. */
1509        sctp_v6_del_protocol();
1510        sctp_v4_del_protocol();
1511
1512        unregister_pernet_subsys(&sctp_net_ops);
1513
1514        /* Free protosw registrations */
1515        sctp_v6_protosw_exit();
1516        sctp_v4_protosw_exit();
1517
1518        /* Unregister with socket layer. */
1519        sctp_v6_pf_exit();
1520        sctp_v4_pf_exit();
1521
1522        sctp_sysctl_unregister();
1523
1524        free_pages((unsigned long)sctp_assoc_hashtable,
1525                   get_order(sctp_assoc_hashsize *
1526                             sizeof(struct sctp_hashbucket)));
1527        kfree(sctp_ep_hashtable);
1528        free_pages((unsigned long)sctp_port_hashtable,
1529                   get_order(sctp_port_hashsize *
1530                             sizeof(struct sctp_bind_hashbucket)));
1531
1532        percpu_counter_destroy(&sctp_sockets_allocated);
1533
1534        rcu_barrier(); /* Wait for completion of call_rcu()'s */
1535
1536        kmem_cache_destroy(sctp_chunk_cachep);
1537        kmem_cache_destroy(sctp_bucket_cachep);
1538}
1539
1540module_init(sctp_init);
1541module_exit(sctp_exit);
1542
1543/*
1544 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1545 */
1546MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1547MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1548MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1549MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1550module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1551MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1552MODULE_LICENSE("GPL");
1553