net/sctp/protocol.c

   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. */
  71 struct sctp_globals sctp_globals __read_mostly;
  72
  73 struct idr sctp_assocs_id;
  74 DEFINE_SPINLOCK(sctp_assocs_id_lock);
  75
  76 static struct sctp_pf *sctp_pf_inet6_specific;
  77 static struct sctp_pf *sctp_pf_inet_specific;
  78 static struct sctp_af *sctp_af_v4_specific;
  79 static struct sctp_af *sctp_af_v6_specific;
  80
  81 struct kmem_cache *sctp_chunk_cachep __read_mostly;
  82 struct kmem_cache *sctp_bucket_cachep __read_mostly;
  83
  84 long sysctl_sctp_mem[3];
  85 int sysctl_sctp_rmem[3];
  86 int sysctl_sctp_wmem[3];
  87
  88 /* Set up the proc fs entry for the SCTP protocol. */
  89 static int __net_init 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
 106 out_remaddr_proc_init:
 107         sctp_assocs_proc_exit(net);
 108 out_assocs_proc_init:
 109         sctp_eps_proc_exit(net);
 110 out_eps_proc_init:
 111         sctp_snmp_proc_exit(net);
 112 out_snmp_proc_init:
 113         remove_proc_entry("sctp", net->proc_net);
 114         net->sctp.proc_net_sctp = NULL;
 115 out_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  */
 125 static 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  */
 141 static 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  */
 173 static 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.  */
 190 static 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'.  */
 203 int 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
 231 end_copy:
 232         rcu_read_unlock();
 233         return error;
 234 }
 235
 236 /* Initialize a sctp_addr from in incoming skb.  */
 237 static 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. */
 259 static 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. */
 267 static 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. */
 273 static 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. */
 279 static 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  */
 291 static 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. */
 304 static 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. */
 313 static 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. */
 327 static 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? */
 335 static 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  */
 347 static 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?   */
 367 static 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  */
 402 static 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  */
 428 static 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->fl4_sport = laddr->a.v4.sin_port;
 502                         flowi4_update_output(fl4,
 503                                              asoc->base.sk->sk_bound_dev_if,
 504                                              RT_CONN_FLAGS(asoc->base.sk),
 505                                              daddr->v4.sin_addr.s_addr,
 506                                              laddr->a.v4.sin_addr.s_addr);
 507
 508                         rt = ip_route_output_key(sock_net(sk), fl4);
 509                         if (!IS_ERR(rt)) {
 510                                 dst = &rt->dst;
 511                                 goto out_unlock;
 512                         }
 513                 }
 514         }
 515
 516 out_unlock:
 517         rcu_read_unlock();
 518 out:
 519         t->dst = dst;
 520         if (dst)
 521                 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
 522                                   &fl4->daddr, &fl4->saddr);
 523         else
 524                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 525 }
 526
 527 /* For v4, the source address is cached in the route entry(dst). So no need
 528  * to cache it separately and hence this is an empty routine.
 529  */
 530 static void sctp_v4_get_saddr(struct sctp_sock *sk,
 531                               struct sctp_transport *t,
 532                               struct flowi *fl)
 533 {
 534         union sctp_addr *saddr = &t->saddr;
 535         struct rtable *rt = (struct rtable *)t->dst;
 536
 537         if (rt) {
 538                 saddr->v4.sin_family = AF_INET;
 539                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 540         }
 541 }
 542
 543 /* What interface did this skb arrive on? */
 544 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 545 {
 546         return inet_iif(skb);
 547 }
 548
 549 /* Was this packet marked by Explicit Congestion Notification? */
 550 static int sctp_v4_is_ce(const struct sk_buff *skb)
 551 {
 552         return INET_ECN_is_ce(ip_hdr(skb)->tos);
 553 }
 554
 555 /* Create and initialize a new sk for the socket returned by accept(). */
 556 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 557                                              struct sctp_association *asoc)
 558 {
 559         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 560                         sk->sk_prot);
 561         struct inet_sock *newinet;
 562
 563         if (!newsk)
 564                 goto out;
 565
 566         sock_init_data(NULL, newsk);
 567
 568         sctp_copy_sock(newsk, sk, asoc);
 569         sock_reset_flag(newsk, SOCK_ZAPPED);
 570
 571         newinet = inet_sk(newsk);
 572
 573         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 574
 575         sk_refcnt_debug_inc(newsk);
 576
 577         if (newsk->sk_prot->init(newsk)) {
 578                 sk_common_release(newsk);
 579                 newsk = NULL;
 580         }
 581
 582 out:
 583         return newsk;
 584 }
 585
 586 /* Map address, empty for v4 family */
 587 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 588 {
 589         /* Empty */
 590 }
 591
 592 /* Dump the v4 addr to the seq file. */
 593 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 594 {
 595         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 596 }
 597
 598 static void sctp_v4_ecn_capable(struct sock *sk)
 599 {
 600         INET_ECN_xmit(sk);
 601 }
 602
 603 static void sctp_addr_wq_timeout_handler(unsigned long arg)
 604 {
 605         struct net *net = (struct net *)arg;
 606         struct sctp_sockaddr_entry *addrw, *temp;
 607         struct sctp_sock *sp;
 608
 609         spin_lock_bh(&net->sctp.addr_wq_lock);
 610
 611         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 612                 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
 613                     " for cmd %d at entry %p\n", &net->sctp.addr_waitq, &addrw->a, addrw->state,
 614                     addrw);
 615
 616 #if IS_ENABLED(CONFIG_IPV6)
 617                 /* Now we send an ASCONF for each association */
 618                 /* Note. we currently don't handle link local IPv6 addressees */
 619                 if (addrw->a.sa.sa_family == AF_INET6) {
 620                         struct in6_addr *in6;
 621
 622                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
 623                             IPV6_ADDR_LINKLOCAL)
 624                                 goto free_next;
 625
 626                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
 627                         if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
 628                             addrw->state == SCTP_ADDR_NEW) {
 629                                 unsigned long timeo_val;
 630
 631                                 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
 632                                     SCTP_ADDRESS_TICK_DELAY);
 633                                 timeo_val = jiffies;
 634                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 635                                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 636                                 break;
 637                         }
 638                 }
 639 #endif
 640                 list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
 641                         struct sock *sk;
 642
 643                         sk = sctp_opt2sk(sp);
 644                         /* ignore bound-specific endpoints */
 645                         if (!sctp_is_ep_boundall(sk))
 646                                 continue;
 647                         sctp_bh_lock_sock(sk);
 648                         if (sctp_asconf_mgmt(sp, addrw) < 0)
 649                                 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
 650                         sctp_bh_unlock_sock(sk);
 651                 }
 652 #if IS_ENABLED(CONFIG_IPV6)
 653 free_next:
 654 #endif
 655                 list_del(&addrw->list);
 656                 kfree(addrw);
 657         }
 658         spin_unlock_bh(&net->sctp.addr_wq_lock);
 659 }
 660
 661 static void sctp_free_addr_wq(struct net *net)
 662 {
 663         struct sctp_sockaddr_entry *addrw;
 664         struct sctp_sockaddr_entry *temp;
 665
 666         spin_lock_bh(&net->sctp.addr_wq_lock);
 667         del_timer(&net->sctp.addr_wq_timer);
 668         list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 669                 list_del(&addrw->list);
 670                 kfree(addrw);
 671         }
 672         spin_unlock_bh(&net->sctp.addr_wq_lock);
 673 }
 674
 675 /* lookup the entry for the same address in the addr_waitq
 676  * sctp_addr_wq MUST be locked
 677  */
 678 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
 679                                         struct sctp_sockaddr_entry *addr)
 680 {
 681         struct sctp_sockaddr_entry *addrw;
 682
 683         list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
 684                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
 685                         continue;
 686                 if (addrw->a.sa.sa_family == AF_INET) {
 687                         if (addrw->a.v4.sin_addr.s_addr ==
 688                             addr->a.v4.sin_addr.s_addr)
 689                                 return addrw;
 690                 } else if (addrw->a.sa.sa_family == AF_INET6) {
 691                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
 692                             &addr->a.v6.sin6_addr))
 693                                 return addrw;
 694                 }
 695         }
 696         return NULL;
 697 }
 698
 699 void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
 700 {
 701         struct sctp_sockaddr_entry *addrw;
 702         unsigned long timeo_val;
 703
 704         /* first, we check if an opposite message already exist in the queue.
 705          * If we found such message, it is removed.
 706          * This operation is a bit stupid, but the DHCP client attaches the
 707          * new address after a couple of addition and deletion of that address
 708          */
 709
 710         spin_lock_bh(&net->sctp.addr_wq_lock);
 711         /* Offsets existing events in addr_wq */
 712         addrw = sctp_addr_wq_lookup(net, addr);
 713         if (addrw) {
 714                 if (addrw->state != cmd) {
 715                         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
 716                             " in wq %p\n", addrw->state, &addrw->a,
 717                             &net->sctp.addr_waitq);
 718                         list_del(&addrw->list);
 719                         kfree(addrw);
 720                 }
 721                 spin_unlock_bh(&net->sctp.addr_wq_lock);
 722                 return;
 723         }
 724
 725         /* OK, we have to add the new address to the wait queue */
 726         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 727         if (addrw == NULL) {
 728                 spin_unlock_bh(&net->sctp.addr_wq_lock);
 729                 return;
 730         }
 731         addrw->state = cmd;
 732         list_add_tail(&addrw->list, &net->sctp.addr_waitq);
 733         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
 734             " in wq %p\n", addrw->state, &addrw->a, &net->sctp.addr_waitq);
 735
 736         if (!timer_pending(&net->sctp.addr_wq_timer)) {
 737                 timeo_val = jiffies;
 738                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 739                 mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 740         }
 741         spin_unlock_bh(&net->sctp.addr_wq_lock);
 742 }
 743
 744 /* Event handler for inet address addition/deletion events.
 745  * The sctp_local_addr_list needs to be protocted by a spin lock since
 746  * multiple notifiers (say IPv4 and IPv6) may be running at the same
 747  * time and thus corrupt the list.
 748  * The reader side is protected with RCU.
 749  */
 750 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 751                                void *ptr)
 752 {
 753         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 754         struct sctp_sockaddr_entry *addr = NULL;
 755         struct sctp_sockaddr_entry *temp;
 756         struct net *net = dev_net(ifa->ifa_dev->dev);
 757         int found = 0;
 758
 759         switch (ev) {
 760         case NETDEV_UP:
 761                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 762                 if (addr) {
 763                         addr->a.v4.sin_family = AF_INET;
 764                         addr->a.v4.sin_port = 0;
 765                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 766                         addr->valid = 1;
 767                         spin_lock_bh(&net->sctp.local_addr_lock);
 768                         list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
 769                         sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
 770                         spin_unlock_bh(&net->sctp.local_addr_lock);
 771                 }
 772                 break;
 773         case NETDEV_DOWN:
 774                 spin_lock_bh(&net->sctp.local_addr_lock);
 775                 list_for_each_entry_safe(addr, temp,
 776                                         &net->sctp.local_addr_list, list) {
 777                         if (addr->a.sa.sa_family == AF_INET &&
 778                                         addr->a.v4.sin_addr.s_addr ==
 779                                         ifa->ifa_local) {
 780                                 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
 781                                 found = 1;
 782                                 addr->valid = 0;
 783                                 list_del_rcu(&addr->list);
 784                                 break;
 785                         }
 786                 }
 787                 spin_unlock_bh(&net->sctp.local_addr_lock);
 788                 if (found)
 789                         kfree_rcu(addr, rcu);
 790                 break;
 791         }
 792
 793         return NOTIFY_DONE;
 794 }
 795
 796 /*
 797  * Initialize the control inode/socket with a control endpoint data
 798  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 799  */
 800 static int sctp_ctl_sock_init(struct net *net)
 801 {
 802         int err;
 803         sa_family_t family = PF_INET;
 804
 805         if (sctp_get_pf_specific(PF_INET6))
 806                 family = PF_INET6;
 807
 808         err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
 809                                    SOCK_SEQPACKET, IPPROTO_SCTP, net);
 810
 811         /* If IPv6 socket could not be created, try the IPv4 socket */
 812         if (err < 0 && family == PF_INET6)
 813                 err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
 814                                            SOCK_SEQPACKET, IPPROTO_SCTP,
 815                                            net);
 816
 817         if (err < 0) {
 818                 pr_err("Failed to create the SCTP control socket\n");
 819                 return err;
 820         }
 821         return 0;
 822 }
 823
 824 /* Register address family specific functions. */
 825 int sctp_register_af(struct sctp_af *af)
 826 {
 827         switch (af->sa_family) {
 828         case AF_INET:
 829                 if (sctp_af_v4_specific)
 830                         return 0;
 831                 sctp_af_v4_specific = af;
 832                 break;
 833         case AF_INET6:
 834                 if (sctp_af_v6_specific)
 835                         return 0;
 836                 sctp_af_v6_specific = af;
 837                 break;
 838         default:
 839                 return 0;
 840         }
 841
 842         INIT_LIST_HEAD(&af->list);
 843         list_add_tail(&af->list, &sctp_address_families);
 844         return 1;
 845 }
 846
 847 /* Get the table of functions for manipulating a particular address
 848  * family.
 849  */
 850 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 851 {
 852         switch (family) {
 853         case AF_INET:
 854                 return sctp_af_v4_specific;
 855         case AF_INET6:
 856                 return sctp_af_v6_specific;
 857         default:
 858                 return NULL;
 859         }
 860 }
 861
 862 /* Common code to initialize a AF_INET msg_name. */
 863 static void sctp_inet_msgname(char *msgname, int *addr_len)
 864 {
 865         struct sockaddr_in *sin;
 866
 867         sin = (struct sockaddr_in *)msgname;
 868         *addr_len = sizeof(struct sockaddr_in);
 869         sin->sin_family = AF_INET;
 870         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 871 }
 872
 873 /* Copy the primary address of the peer primary address as the msg_name. */
 874 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 875                                     int *addr_len)
 876 {
 877         struct sockaddr_in *sin, *sinfrom;
 878
 879         if (msgname) {
 880                 struct sctp_association *asoc;
 881
 882                 asoc = event->asoc;
 883                 sctp_inet_msgname(msgname, addr_len);
 884                 sin = (struct sockaddr_in *)msgname;
 885                 sinfrom = &asoc->peer.primary_addr.v4;
 886                 sin->sin_port = htons(asoc->peer.port);
 887                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 888         }
 889 }
 890
 891 /* Initialize and copy out a msgname from an inbound skb. */
 892 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 893 {
 894         if (msgname) {
 895                 struct sctphdr *sh = sctp_hdr(skb);
 896                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 897
 898                 sctp_inet_msgname(msgname, len);
 899                 sin->sin_port = sh->source;
 900                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 901         }
 902 }
 903
 904 /* Do we support this AF? */
 905 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 906 {
 907         /* PF_INET only supports AF_INET addresses. */
 908         return AF_INET == family;
 909 }
 910
 911 /* Address matching with wildcards allowed. */
 912 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 913                               const union sctp_addr *addr2,
 914                               struct sctp_sock *opt)
 915 {
 916         /* PF_INET only supports AF_INET addresses. */
 917         if (addr1->sa.sa_family != addr2->sa.sa_family)
 918                 return 0;
 919         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 920             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 921                 return 1;
 922         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 923                 return 1;
 924
 925         return 0;
 926 }
 927
 928 /* Verify that provided sockaddr looks bindable.  Common verification has
 929  * already been taken care of.
 930  */
 931 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 932 {
 933         return sctp_v4_available(addr, opt);
 934 }
 935
 936 /* Verify that sockaddr looks sendable.  Common verification has already
 937  * been taken care of.
 938  */
 939 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 940 {
 941         return 1;
 942 }
 943
 944 /* Fill in Supported Address Type information for INIT and INIT-ACK
 945  * chunks.  Returns number of addresses supported.
 946  */
 947 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 948                                      __be16 *types)
 949 {
 950         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 951         return 1;
 952 }
 953
 954 /* Wrapper routine that calls the ip transmit routine. */
 955 static inline int sctp_v4_xmit(struct sk_buff *skb,
 956                                struct sctp_transport *transport)
 957 {
 958         struct inet_sock *inet = inet_sk(skb->sk);
 959
 960         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 961                           __func__, skb, skb->len,
 962                           &transport->fl.u.ip4.saddr,
 963                           &transport->fl.u.ip4.daddr);
 964
 965         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 966                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 967
 968         SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
 969         return ip_queue_xmit(skb, &transport->fl);
 970 }
 971
 972 static struct sctp_af sctp_af_inet;
 973
 974 static struct sctp_pf sctp_pf_inet = {
 975         .event_msgname = sctp_inet_event_msgname,
 976         .skb_msgname   = sctp_inet_skb_msgname,
 977         .af_supported  = sctp_inet_af_supported,
 978         .cmp_addr      = sctp_inet_cmp_addr,
 979         .bind_verify   = sctp_inet_bind_verify,
 980         .send_verify   = sctp_inet_send_verify,
 981         .supported_addrs = sctp_inet_supported_addrs,
 982         .create_accept_sk = sctp_v4_create_accept_sk,
 983         .addr_v4map     = sctp_v4_addr_v4map,
 984         .af            = &sctp_af_inet
 985 };
 986
 987 /* Notifier for inetaddr addition/deletion events.  */
 988 static struct notifier_block sctp_inetaddr_notifier = {
 989         .notifier_call = sctp_inetaddr_event,
 990 };
 991
 992 /* Socket operations.  */
 993 static const struct proto_ops inet_seqpacket_ops = {
 994         .family            = PF_INET,
 995         .owner             = THIS_MODULE,
 996         .release           = inet_release,      /* Needs to be wrapped... */
 997         .bind              = inet_bind,
 998         .connect           = inet_dgram_connect,
 999         .socketpair        = sock_no_socketpair,
1000         .accept            = inet_accept,
1001         .getname           = inet_getname,      /* Semantics are different.  */
1002         .poll              = sctp_poll,
1003         .ioctl             = inet_ioctl,
1004         .listen            = sctp_inet_listen,
1005         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1006         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1007         .getsockopt        = sock_common_getsockopt,
1008         .sendmsg           = inet_sendmsg,
1009         .recvmsg           = sock_common_recvmsg,
1010         .mmap              = sock_no_mmap,
1011         .sendpage          = sock_no_sendpage,
1012 #ifdef CONFIG_COMPAT
1013         .compat_setsockopt = compat_sock_common_setsockopt,
1014         .compat_getsockopt = compat_sock_common_getsockopt,
1015 #endif
1016 };
1017
1018 /* Registration with AF_INET family.  */
1019 static struct inet_protosw sctp_seqpacket_protosw = {
1020         .type       = SOCK_SEQPACKET,
1021         .protocol   = IPPROTO_SCTP,
1022         .prot       = &sctp_prot,
1023         .ops        = &inet_seqpacket_ops,
1024         .no_check   = 0,
1025         .flags      = SCTP_PROTOSW_FLAG
1026 };
1027 static struct inet_protosw sctp_stream_protosw = {
1028         .type       = SOCK_STREAM,
1029         .protocol   = IPPROTO_SCTP,
1030         .prot       = &sctp_prot,
1031         .ops        = &inet_seqpacket_ops,
1032         .no_check   = 0,
1033         .flags      = SCTP_PROTOSW_FLAG
1034 };
1035
1036 /* Register with IP layer.  */
1037 static const struct net_protocol sctp_protocol = {
1038         .handler     = sctp_rcv,
1039         .err_handler = sctp_v4_err,
1040         .no_policy   = 1,
1041         .netns_ok    = 1,
1042 };
1043
1044 /* IPv4 address related functions.  */
1045 static struct sctp_af sctp_af_inet = {
1046         .sa_family         = AF_INET,
1047         .sctp_xmit         = sctp_v4_xmit,
1048         .setsockopt        = ip_setsockopt,
1049         .getsockopt        = ip_getsockopt,
1050         .get_dst           = sctp_v4_get_dst,
1051         .get_saddr         = sctp_v4_get_saddr,
1052         .copy_addrlist     = sctp_v4_copy_addrlist,
1053         .from_skb          = sctp_v4_from_skb,
1054         .from_sk           = sctp_v4_from_sk,
1055         .to_sk_saddr       = sctp_v4_to_sk_saddr,
1056         .to_sk_daddr       = sctp_v4_to_sk_daddr,
1057         .from_addr_param   = sctp_v4_from_addr_param,
1058         .to_addr_param     = sctp_v4_to_addr_param,
1059         .cmp_addr          = sctp_v4_cmp_addr,
1060         .addr_valid        = sctp_v4_addr_valid,
1061         .inaddr_any        = sctp_v4_inaddr_any,
1062         .is_any            = sctp_v4_is_any,
1063         .available         = sctp_v4_available,
1064         .scope             = sctp_v4_scope,
1065         .skb_iif           = sctp_v4_skb_iif,
1066         .is_ce             = sctp_v4_is_ce,
1067         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1068         .ecn_capable       = sctp_v4_ecn_capable,
1069         .net_header_len    = sizeof(struct iphdr),
1070         .sockaddr_len      = sizeof(struct sockaddr_in),
1071 #ifdef CONFIG_COMPAT
1072         .compat_setsockopt = compat_ip_setsockopt,
1073         .compat_getsockopt = compat_ip_getsockopt,
1074 #endif
1075 };
1076
1077 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1078
1079         switch (family) {
1080         case PF_INET:
1081                 return sctp_pf_inet_specific;
1082         case PF_INET6:
1083                 return sctp_pf_inet6_specific;
1084         default:
1085                 return NULL;
1086         }
1087 }
1088
1089 /* Register the PF specific function table.  */
1090 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1091 {
1092         switch (family) {
1093         case PF_INET:
1094                 if (sctp_pf_inet_specific)
1095                         return 0;
1096                 sctp_pf_inet_specific = pf;
1097                 break;
1098         case PF_INET6:
1099                 if (sctp_pf_inet6_specific)
1100                         return 0;
1101                 sctp_pf_inet6_specific = pf;
1102                 break;
1103         default:
1104                 return 0;
1105         }
1106         return 1;
1107 }
1108
1109 static inline int init_sctp_mibs(struct net *net)
1110 {
1111         return snmp_mib_init((void __percpu **)net->sctp.sctp_statistics,
1112                              sizeof(struct sctp_mib),
1113                              __alignof__(struct sctp_mib));
1114 }
1115
1116 static inline void cleanup_sctp_mibs(struct net *net)
1117 {
1118         snmp_mib_free((void __percpu **)net->sctp.sctp_statistics);
1119 }
1120
1121 static void sctp_v4_pf_init(void)
1122 {
1123         /* Initialize the SCTP specific PF functions. */
1124         sctp_register_pf(&sctp_pf_inet, PF_INET);
1125         sctp_register_af(&sctp_af_inet);
1126 }
1127
1128 static void sctp_v4_pf_exit(void)
1129 {
1130         list_del(&sctp_af_inet.list);
1131 }
1132
1133 static int sctp_v4_protosw_init(void)
1134 {
1135         int rc;
1136
1137         rc = proto_register(&sctp_prot, 1);
1138         if (rc)
1139                 return rc;
1140
1141         /* Register SCTP(UDP and TCP style) with socket layer.  */
1142         inet_register_protosw(&sctp_seqpacket_protosw);
1143         inet_register_protosw(&sctp_stream_protosw);
1144
1145         return 0;
1146 }
1147
1148 static void sctp_v4_protosw_exit(void)
1149 {
1150         inet_unregister_protosw(&sctp_stream_protosw);
1151         inet_unregister_protosw(&sctp_seqpacket_protosw);
1152         proto_unregister(&sctp_prot);
1153 }
1154
1155 static int sctp_v4_add_protocol(void)
1156 {
1157         /* Register notifier for inet address additions/deletions. */
1158         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1159
1160         /* Register SCTP with inet layer.  */
1161         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1162                 return -EAGAIN;
1163
1164         return 0;
1165 }
1166
1167 static void sctp_v4_del_protocol(void)
1168 {
1169         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1170         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1171 }
1172
1173 static int __net_init sctp_net_init(struct net *net)
1174 {
1175         int status;
1176
1177         /*
1178          * 14. Suggested SCTP Protocol Parameter Values
1179          */
1180         /* The following protocol parameters are RECOMMENDED:  */
1181         /* RTO.Initial              - 3  seconds */
1182         net->sctp.rto_initial                   = SCTP_RTO_INITIAL;
1183         /* RTO.Min                  - 1  second */
1184         net->sctp.rto_min                       = SCTP_RTO_MIN;
1185         /* RTO.Max                 -  60 seconds */
1186         net->sctp.rto_max                       = SCTP_RTO_MAX;
1187         /* RTO.Alpha                - 1/8 */
1188         net->sctp.rto_alpha                     = SCTP_RTO_ALPHA;
1189         /* RTO.Beta                 - 1/4 */
1190         net->sctp.rto_beta                      = SCTP_RTO_BETA;
1191
1192         /* Valid.Cookie.Life        - 60  seconds */
1193         net->sctp.valid_cookie_life             = SCTP_DEFAULT_COOKIE_LIFE;
1194
1195         /* Whether Cookie Preservative is enabled(1) or not(0) */
1196         net->sctp.cookie_preserve_enable        = 1;
1197
1198         /* Default sctp sockets to use md5 as their hmac alg */
1199 #if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1200         net->sctp.sctp_hmac_alg                 = "md5";
1201 #elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1202         net->sctp.sctp_hmac_alg                 = "sha1";
1203 #else
1204         net->sctp.sctp_hmac_alg                 = NULL;
1205 #endif
1206
1207         /* Max.Burst                - 4 */
1208         net->sctp.max_burst                     = SCTP_DEFAULT_MAX_BURST;
1209
1210         /* Association.Max.Retrans  - 10 attempts
1211          * Path.Max.Retrans         - 5  attempts (per destination address)
1212          * Max.Init.Retransmits     - 8  attempts
1213          */
1214         net->sctp.max_retrans_association       = 10;
1215         net->sctp.max_retrans_path              = 5;
1216         net->sctp.max_retrans_init              = 8;
1217
1218         /* Sendbuffer growth        - do per-socket accounting */
1219         net->sctp.sndbuf_policy                 = 0;
1220
1221         /* Rcvbuffer growth         - do per-socket accounting */
1222         net->sctp.rcvbuf_policy                 = 0;
1223
1224         /* HB.interval              - 30 seconds */
1225         net->sctp.hb_interval                   = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1226
1227         /* delayed SACK timeout */
1228         net->sctp.sack_timeout                  = SCTP_DEFAULT_TIMEOUT_SACK;
1229
1230         /* Disable ADDIP by default. */
1231         net->sctp.addip_enable = 0;
1232         net->sctp.addip_noauth = 0;
1233         net->sctp.default_auto_asconf = 0;
1234
1235         /* Enable PR-SCTP by default. */
1236         net->sctp.prsctp_enable = 1;
1237
1238         /* Disable AUTH by default. */
1239         net->sctp.auth_enable = 0;
1240
1241         /* Set SCOPE policy to enabled */
1242         net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1243
1244         /* Set the default rwnd update threshold */
1245         net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1246
1247         /* Initialize maximum autoclose timeout. */
1248         net->sctp.max_autoclose         = INT_MAX / HZ;
1249
1250         status = sctp_sysctl_net_register(net);
1251         if (status)
1252                 goto err_sysctl_register;
1253
1254         /* Allocate and initialise sctp mibs.  */
1255         status = init_sctp_mibs(net);
1256         if (status)
1257                 goto err_init_mibs;
1258
1259         /* Initialize proc fs directory.  */
1260         status = sctp_proc_init(net);
1261         if (status)
1262                 goto err_init_proc;
1263
1264         sctp_dbg_objcnt_init(net);
1265
1266         /* Initialize the control inode/socket for handling OOTB packets.  */
1267         if ((status = sctp_ctl_sock_init(net))) {
1268                 pr_err("Failed to initialize the SCTP control sock\n");
1269                 goto err_ctl_sock_init;
1270         }
1271
1272         /* Initialize the local address list. */
1273         INIT_LIST_HEAD(&net->sctp.local_addr_list);
1274         spin_lock_init(&net->sctp.local_addr_lock);
1275         sctp_get_local_addr_list(net);
1276
1277         /* Initialize the address event list */
1278         INIT_LIST_HEAD(&net->sctp.addr_waitq);
1279         INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1280         spin_lock_init(&net->sctp.addr_wq_lock);
1281         net->sctp.addr_wq_timer.expires = 0;
1282         setup_timer(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler,
1283                     (unsigned long)net);
1284
1285         return 0;
1286
1287 err_ctl_sock_init:
1288         sctp_dbg_objcnt_exit(net);
1289         sctp_proc_exit(net);
1290 err_init_proc:
1291         cleanup_sctp_mibs(net);
1292 err_init_mibs:
1293         sctp_sysctl_net_unregister(net);
1294 err_sysctl_register:
1295         return status;
1296 }
1297
1298 static void __net_exit sctp_net_exit(struct net *net)
1299 {
1300         /* Free the local address list */
1301         sctp_free_addr_wq(net);
1302         sctp_free_local_addr_list(net);
1303
1304         /* Free the control endpoint.  */
1305         inet_ctl_sock_destroy(net->sctp.ctl_sock);
1306
1307         sctp_dbg_objcnt_exit(net);
1308
1309         sctp_proc_exit(net);
1310         cleanup_sctp_mibs(net);
1311         sctp_sysctl_net_unregister(net);
1312 }
1313
1314 static struct pernet_operations sctp_net_ops = {
1315         .init = sctp_net_init,
1316         .exit = sctp_net_exit,
1317 };
1318
1319 /* Initialize the universe into something sensible.  */
1320 SCTP_STATIC __init int sctp_init(void)
1321 {
1322         int i;
1323         int status = -EINVAL;
1324         unsigned long goal;
1325         unsigned long limit;
1326         int max_share;
1327         int order;
1328
1329         /* SCTP_DEBUG sanity check. */
1330         if (!sctp_sanity_check())
1331                 goto out;
1332
1333         /* Allocate bind_bucket and chunk caches. */
1334         status = -ENOBUFS;
1335         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1336                                                sizeof(struct sctp_bind_bucket),
1337                                                0, SLAB_HWCACHE_ALIGN,
1338                                                NULL);
1339         if (!sctp_bucket_cachep)
1340                 goto out;
1341
1342         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1343                                                sizeof(struct sctp_chunk),
1344                                                0, SLAB_HWCACHE_ALIGN,
1345                                                NULL);
1346         if (!sctp_chunk_cachep)
1347                 goto err_chunk_cachep;
1348
1349         status = percpu_counter_init(&sctp_sockets_allocated, 0);
1350         if (status)
1351                 goto err_percpu_counter_init;
1352
1353         /* Implementation specific variables. */
1354
1355         /* Initialize default stream count setup information. */
1356         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1357         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1358
1359         /* Initialize handle used for association ids. */
1360         idr_init(&sctp_assocs_id);
1361
1362         limit = nr_free_buffer_pages() / 8;
1363         limit = max(limit, 128UL);
1364         sysctl_sctp_mem[0] = limit / 4 * 3;
1365         sysctl_sctp_mem[1] = limit;
1366         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1367
1368         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1369         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1370         max_share = min(4UL*1024*1024, limit);
1371
1372         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1373         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1374         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1375
1376         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1377         sysctl_sctp_wmem[1] = 16*1024;
1378         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1379
1380         /* Size and allocate the association hash table.
1381          * The methodology is similar to that of the tcp hash tables.
1382          */
1383         if (totalram_pages >= (128 * 1024))
1384                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1385         else
1386                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1387
1388         for (order = 0; (1UL << order) < goal; order++)
1389                 ;
1390
1391         do {
1392                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1393                                         sizeof(struct sctp_hashbucket);
1394                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1395                         continue;
1396                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1397                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1398         } while (!sctp_assoc_hashtable && --order > 0);
1399         if (!sctp_assoc_hashtable) {
1400                 pr_err("Failed association hash alloc\n");
1401                 status = -ENOMEM;
1402                 goto err_ahash_alloc;
1403         }
1404         for (i = 0; i < sctp_assoc_hashsize; i++) {
1405                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1406                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1407         }
1408
1409         /* Allocate and initialize the endpoint hash table.  */
1410         sctp_ep_hashsize = 64;
1411         sctp_ep_hashtable =
1412                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1413         if (!sctp_ep_hashtable) {
1414                 pr_err("Failed endpoint_hash alloc\n");
1415                 status = -ENOMEM;
1416                 goto err_ehash_alloc;
1417         }
1418         for (i = 0; i < sctp_ep_hashsize; i++) {
1419                 rwlock_init(&sctp_ep_hashtable[i].lock);
1420                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1421         }
1422
1423         /* Allocate and initialize the SCTP port hash table.  */
1424         do {
1425                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1426                                         sizeof(struct sctp_bind_hashbucket);
1427                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1428                         continue;
1429                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1430                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1431         } while (!sctp_port_hashtable && --order > 0);
1432         if (!sctp_port_hashtable) {
1433                 pr_err("Failed bind hash alloc\n");
1434                 status = -ENOMEM;
1435                 goto err_bhash_alloc;
1436         }
1437         for (i = 0; i < sctp_port_hashsize; i++) {
1438                 spin_lock_init(&sctp_port_hashtable[i].lock);
1439                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1440         }
1441
1442         pr_info("Hash tables configured (established %d bind %d)\n",
1443                 sctp_assoc_hashsize, sctp_port_hashsize);
1444
1445         sctp_sysctl_register();
1446
1447         INIT_LIST_HEAD(&sctp_address_families);
1448         sctp_v4_pf_init();
1449         sctp_v6_pf_init();
1450
1451         status = sctp_v4_protosw_init();
1452
1453         if (status)
1454                 goto err_protosw_init;
1455
1456         status = sctp_v6_protosw_init();
1457         if (status)
1458                 goto err_v6_protosw_init;
1459
1460         status = register_pernet_subsys(&sctp_net_ops);
1461         if (status)
1462                 goto err_register_pernet_subsys;
1463
1464         status = sctp_v4_add_protocol();
1465         if (status)
1466                 goto err_add_protocol;
1467
1468         /* Register SCTP with inet6 layer.  */
1469         status = sctp_v6_add_protocol();
1470         if (status)
1471                 goto err_v6_add_protocol;
1472
1473         status = 0;
1474 out:
1475         return status;
1476 err_v6_add_protocol:
1477         sctp_v4_del_protocol();
1478 err_add_protocol:
1479         unregister_pernet_subsys(&sctp_net_ops);
1480 err_register_pernet_subsys:
1481         sctp_v6_protosw_exit();
1482 err_v6_protosw_init:
1483         sctp_v4_protosw_exit();
1484 err_protosw_init:
1485         sctp_v4_pf_exit();
1486         sctp_v6_pf_exit();
1487         sctp_sysctl_unregister();
1488         free_pages((unsigned long)sctp_port_hashtable,
1489                    get_order(sctp_port_hashsize *
1490                              sizeof(struct sctp_bind_hashbucket)));
1491 err_bhash_alloc:
1492         kfree(sctp_ep_hashtable);
1493 err_ehash_alloc:
1494         free_pages((unsigned long)sctp_assoc_hashtable,
1495                    get_order(sctp_assoc_hashsize *
1496                              sizeof(struct sctp_hashbucket)));
1497 err_ahash_alloc:
1498         percpu_counter_destroy(&sctp_sockets_allocated);
1499 err_percpu_counter_init:
1500         kmem_cache_destroy(sctp_chunk_cachep);
1501 err_chunk_cachep:
1502         kmem_cache_destroy(sctp_bucket_cachep);
1503         goto out;
1504 }
1505
1506 /* Exit handler for the SCTP protocol.  */
1507 SCTP_STATIC __exit void sctp_exit(void)
1508 {
1509         /* BUG.  This should probably do something useful like clean
1510          * up all the remaining associations and all that memory.
1511          */
1512
1513         /* Unregister with inet6/inet layers. */
1514         sctp_v6_del_protocol();
1515         sctp_v4_del_protocol();
1516
1517         unregister_pernet_subsys(&sctp_net_ops);
1518
1519         /* Free protosw registrations */
1520         sctp_v6_protosw_exit();
1521         sctp_v4_protosw_exit();
1522
1523         /* Unregister with socket layer. */
1524         sctp_v6_pf_exit();
1525         sctp_v4_pf_exit();
1526
1527         sctp_sysctl_unregister();
1528
1529         free_pages((unsigned long)sctp_assoc_hashtable,
1530                    get_order(sctp_assoc_hashsize *
1531                              sizeof(struct sctp_hashbucket)));
1532         kfree(sctp_ep_hashtable);
1533         free_pages((unsigned long)sctp_port_hashtable,
1534                    get_order(sctp_port_hashsize *
1535                              sizeof(struct sctp_bind_hashbucket)));
1536
1537         percpu_counter_destroy(&sctp_sockets_allocated);
1538
1539         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1540
1541         kmem_cache_destroy(sctp_chunk_cachep);
1542         kmem_cache_destroy(sctp_bucket_cachep);
1543 }
1544
1545 module_init(sctp_init);
1546 module_exit(sctp_exit);
1547
1548 /*
1549  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1550  */
1551 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1552 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1553 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1554 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1555 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1556 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1557 MODULE_LICENSE("GPL");