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 DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
  73
  74 #ifdef CONFIG_PROC_FS
  75 struct proc_dir_entry   *proc_net_sctp;
  76 #endif
  77
  78 struct idr sctp_assocs_id;
  79 DEFINE_SPINLOCK(sctp_assocs_id_lock);
  80
  81 /* This is the global socket data structure used for responding to
  82  * the Out-of-the-blue (OOTB) packets.  A control sock will be created
  83  * for this socket at the initialization time.
  84  */
  85 static struct sock *sctp_ctl_sock;
  86
  87 static struct sctp_pf *sctp_pf_inet6_specific;
  88 static struct sctp_pf *sctp_pf_inet_specific;
  89 static struct sctp_af *sctp_af_v4_specific;
  90 static struct sctp_af *sctp_af_v6_specific;
  91
  92 struct kmem_cache *sctp_chunk_cachep __read_mostly;
  93 struct kmem_cache *sctp_bucket_cachep __read_mostly;
  94
  95 long sysctl_sctp_mem[3];
  96 int sysctl_sctp_rmem[3];
  97 int sysctl_sctp_wmem[3];
  98
  99 /* Return the address of the control sock. */
 100 struct sock *sctp_get_ctl_sock(void)
 101 {
 102         return sctp_ctl_sock;
 103 }
 104
 105 /* Set up the proc fs entry for the SCTP protocol. */
 106 static __init int sctp_proc_init(void)
 107 {
 108         if (percpu_counter_init(&sctp_sockets_allocated, 0))
 109                 goto out_nomem;
 110 #ifdef CONFIG_PROC_FS
 111         if (!proc_net_sctp) {
 112                 proc_net_sctp = proc_mkdir("sctp", init_net.proc_net);
 113                 if (!proc_net_sctp)
 114                         goto out_free_percpu;
 115         }
 116
 117         if (sctp_snmp_proc_init())
 118                 goto out_snmp_proc_init;
 119         if (sctp_eps_proc_init())
 120                 goto out_eps_proc_init;
 121         if (sctp_assocs_proc_init())
 122                 goto out_assocs_proc_init;
 123         if (sctp_remaddr_proc_init())
 124                 goto out_remaddr_proc_init;
 125
 126         return 0;
 127
 128 out_remaddr_proc_init:
 129         sctp_assocs_proc_exit();
 130 out_assocs_proc_init:
 131         sctp_eps_proc_exit();
 132 out_eps_proc_init:
 133         sctp_snmp_proc_exit();
 134 out_snmp_proc_init:
 135         if (proc_net_sctp) {
 136                 proc_net_sctp = NULL;
 137                 remove_proc_entry("sctp", init_net.proc_net);
 138         }
 139 out_free_percpu:
 140         percpu_counter_destroy(&sctp_sockets_allocated);
 141 #else
 142         return 0;
 143 #endif /* CONFIG_PROC_FS */
 144
 145 out_nomem:
 146         return -ENOMEM;
 147 }
 148
 149 /* Clean up the proc fs entry for the SCTP protocol.
 150  * Note: Do not make this __exit as it is used in the init error
 151  * path.
 152  */
 153 static void sctp_proc_exit(void)
 154 {
 155 #ifdef CONFIG_PROC_FS
 156         sctp_snmp_proc_exit();
 157         sctp_eps_proc_exit();
 158         sctp_assocs_proc_exit();
 159         sctp_remaddr_proc_exit();
 160
 161         if (proc_net_sctp) {
 162                 proc_net_sctp = NULL;
 163                 remove_proc_entry("sctp", init_net.proc_net);
 164         }
 165 #endif
 166         percpu_counter_destroy(&sctp_sockets_allocated);
 167 }
 168
 169 /* Private helper to extract ipv4 address and stash them in
 170  * the protocol structure.
 171  */
 172 static void sctp_v4_copy_addrlist(struct list_head *addrlist,
 173                                   struct net_device *dev)
 174 {
 175         struct in_device *in_dev;
 176         struct in_ifaddr *ifa;
 177         struct sctp_sockaddr_entry *addr;
 178
 179         rcu_read_lock();
 180         if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
 181                 rcu_read_unlock();
 182                 return;
 183         }
 184
 185         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
 186                 /* Add the address to the local list.  */
 187                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
 188                 if (addr) {
 189                         addr->a.v4.sin_family = AF_INET;
 190                         addr->a.v4.sin_port = 0;
 191                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 192                         addr->valid = 1;
 193                         INIT_LIST_HEAD(&addr->list);
 194                         list_add_tail(&addr->list, addrlist);
 195                 }
 196         }
 197
 198         rcu_read_unlock();
 199 }
 200
 201 /* Extract our IP addresses from the system and stash them in the
 202  * protocol structure.
 203  */
 204 static void sctp_get_local_addr_list(void)
 205 {
 206         struct net_device *dev;
 207         struct list_head *pos;
 208         struct sctp_af *af;
 209
 210         rcu_read_lock();
 211         for_each_netdev_rcu(&init_net, dev) {
 212                 __list_for_each(pos, &sctp_address_families) {
 213                         af = list_entry(pos, struct sctp_af, list);
 214                         af->copy_addrlist(&sctp_local_addr_list, dev);
 215                 }
 216         }
 217         rcu_read_unlock();
 218 }
 219
 220 /* Free the existing local addresses.  */
 221 static void sctp_free_local_addr_list(void)
 222 {
 223         struct sctp_sockaddr_entry *addr;
 224         struct list_head *pos, *temp;
 225
 226         list_for_each_safe(pos, temp, &sctp_local_addr_list) {
 227                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 228                 list_del(pos);
 229                 kfree(addr);
 230         }
 231 }
 232
 233 /* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 234 int sctp_copy_local_addr_list(struct sctp_bind_addr *bp, sctp_scope_t scope,
 235                               gfp_t gfp, int copy_flags)
 236 {
 237         struct sctp_sockaddr_entry *addr;
 238         int error = 0;
 239
 240         rcu_read_lock();
 241         list_for_each_entry_rcu(addr, &sctp_local_addr_list, list) {
 242                 if (!addr->valid)
 243                         continue;
 244                 if (sctp_in_scope(&addr->a, scope)) {
 245                         /* Now that the address is in scope, check to see if
 246                          * the address type is really supported by the local
 247                          * sock as well as the remote peer.
 248                          */
 249                         if ((((AF_INET == addr->a.sa.sa_family) &&
 250                               (copy_flags & SCTP_ADDR4_PEERSUPP))) ||
 251                             (((AF_INET6 == addr->a.sa.sa_family) &&
 252                               (copy_flags & SCTP_ADDR6_ALLOWED) &&
 253                               (copy_flags & SCTP_ADDR6_PEERSUPP)))) {
 254                                 error = sctp_add_bind_addr(bp, &addr->a,
 255                                                     SCTP_ADDR_SRC, GFP_ATOMIC);
 256                                 if (error)
 257                                         goto end_copy;
 258                         }
 259                 }
 260         }
 261
 262 end_copy:
 263         rcu_read_unlock();
 264         return error;
 265 }
 266
 267 /* Initialize a sctp_addr from in incoming skb.  */
 268 static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 269                              int is_saddr)
 270 {
 271         void *from;
 272         __be16 *port;
 273         struct sctphdr *sh;
 274
 275         port = &addr->v4.sin_port;
 276         addr->v4.sin_family = AF_INET;
 277
 278         sh = sctp_hdr(skb);
 279         if (is_saddr) {
 280                 *port  = sh->source;
 281                 from = &ip_hdr(skb)->saddr;
 282         } else {
 283                 *port = sh->dest;
 284                 from = &ip_hdr(skb)->daddr;
 285         }
 286         memcpy(&addr->v4.sin_addr.s_addr, from, sizeof(struct in_addr));
 287 }
 288
 289 /* Initialize an sctp_addr from a socket. */
 290 static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 291 {
 292         addr->v4.sin_family = AF_INET;
 293         addr->v4.sin_port = 0;
 294         addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
 295 }
 296
 297 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
 298 static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 299 {
 300         inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
 301 }
 302
 303 /* Initialize sk->sk_daddr from sctp_addr. */
 304 static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 305 {
 306         inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
 307 }
 308
 309 /* Initialize a sctp_addr from an address parameter. */
 310 static void sctp_v4_from_addr_param(union sctp_addr *addr,
 311                                     union sctp_addr_param *param,
 312                                     __be16 port, int iif)
 313 {
 314         addr->v4.sin_family = AF_INET;
 315         addr->v4.sin_port = port;
 316         addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 317 }
 318
 319 /* Initialize an address parameter from a sctp_addr and return the length
 320  * of the address parameter.
 321  */
 322 static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 323                                  union sctp_addr_param *param)
 324 {
 325         int length = sizeof(sctp_ipv4addr_param_t);
 326
 327         param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 328         param->v4.param_hdr.length = htons(length);
 329         param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 330
 331         return length;
 332 }
 333
 334 /* Initialize a sctp_addr from a dst_entry. */
 335 static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
 336                               __be16 port)
 337 {
 338         saddr->v4.sin_family = AF_INET;
 339         saddr->v4.sin_port = port;
 340         saddr->v4.sin_addr.s_addr = fl4->saddr;
 341 }
 342
 343 /* Compare two addresses exactly. */
 344 static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 345                             const union sctp_addr *addr2)
 346 {
 347         if (addr1->sa.sa_family != addr2->sa.sa_family)
 348                 return 0;
 349         if (addr1->v4.sin_port != addr2->v4.sin_port)
 350                 return 0;
 351         if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 352                 return 0;
 353
 354         return 1;
 355 }
 356
 357 /* Initialize addr struct to INADDR_ANY. */
 358 static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 359 {
 360         addr->v4.sin_family = AF_INET;
 361         addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 362         addr->v4.sin_port = port;
 363 }
 364
 365 /* Is this a wildcard address? */
 366 static int sctp_v4_is_any(const union sctp_addr *addr)
 367 {
 368         return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 369 }
 370
 371 /* This function checks if the address is a valid address to be used for
 372  * SCTP binding.
 373  *
 374  * Output:
 375  * Return 0 - If the address is a non-unicast or an illegal address.
 376  * Return 1 - If the address is a unicast.
 377  */
 378 static int sctp_v4_addr_valid(union sctp_addr *addr,
 379                               struct sctp_sock *sp,
 380                               const struct sk_buff *skb)
 381 {
 382         /* IPv4 addresses not allowed */
 383         if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 384                 return 0;
 385
 386         /* Is this a non-unicast address or a unusable SCTP address? */
 387         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 388                 return 0;
 389
 390         /* Is this a broadcast address? */
 391         if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
 392                 return 0;
 393
 394         return 1;
 395 }
 396
 397 /* Should this be available for binding?   */
 398 static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 399 {
 400         int ret = inet_addr_type(&init_net, addr->v4.sin_addr.s_addr);
 401
 402
 403         if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 404            ret != RTN_LOCAL &&
 405            !sp->inet.freebind &&
 406            !sysctl_ip_nonlocal_bind)
 407                 return 0;
 408
 409         if (ipv6_only_sock(sctp_opt2sk(sp)))
 410                 return 0;
 411
 412         return 1;
 413 }
 414
 415 /* Checking the loopback, private and other address scopes as defined in
 416  * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 417  * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 418  *
 419  * Level 0 - unusable SCTP addresses
 420  * Level 1 - loopback address
 421  * Level 2 - link-local addresses
 422  * Level 3 - private addresses.
 423  * Level 4 - global addresses
 424  * For INIT and INIT-ACK address list, let L be the level of
 425  * of requested destination address, sender and receiver
 426  * SHOULD include all of its addresses with level greater
 427  * than or equal to L.
 428  *
 429  * IPv4 scoping can be controlled through sysctl option
 430  * net.sctp.addr_scope_policy
 431  */
 432 static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
 433 {
 434         sctp_scope_t retval;
 435
 436         /* Check for unusable SCTP addresses. */
 437         if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 438                 retval =  SCTP_SCOPE_UNUSABLE;
 439         } else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 440                 retval = SCTP_SCOPE_LOOPBACK;
 441         } else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 442                 retval = SCTP_SCOPE_LINK;
 443         } else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 444                    ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 445                    ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 446                 retval = SCTP_SCOPE_PRIVATE;
 447         } else {
 448                 retval = SCTP_SCOPE_GLOBAL;
 449         }
 450
 451         return retval;
 452 }
 453
 454 /* Returns a valid dst cache entry for the given source and destination ip
 455  * addresses. If an association is passed, trys to get a dst entry with a
 456  * source address that matches an address in the bind address list.
 457  */
 458 static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 459                                 struct flowi *fl, struct sock *sk)
 460 {
 461         struct sctp_association *asoc = t->asoc;
 462         struct rtable *rt;
 463         struct flowi4 *fl4 = &fl->u.ip4;
 464         struct sctp_bind_addr *bp;
 465         struct sctp_sockaddr_entry *laddr;
 466         struct dst_entry *dst = NULL;
 467         union sctp_addr *daddr = &t->ipaddr;
 468         union sctp_addr dst_saddr;
 469
 470         memset(fl4, 0x0, sizeof(struct flowi4));
 471         fl4->daddr  = daddr->v4.sin_addr.s_addr;
 472         fl4->fl4_dport = daddr->v4.sin_port;
 473         fl4->flowi4_proto = IPPROTO_SCTP;
 474         if (asoc) {
 475                 fl4->flowi4_tos = RT_CONN_FLAGS(asoc->base.sk);
 476                 fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
 477                 fl4->fl4_sport = htons(asoc->base.bind_addr.port);
 478         }
 479         if (saddr) {
 480                 fl4->saddr = saddr->v4.sin_addr.s_addr;
 481                 fl4->fl4_sport = saddr->v4.sin_port;
 482         }
 483
 484         SCTP_DEBUG_PRINTK("%s: DST:%pI4, SRC:%pI4 - ",
 485                           __func__, &fl4->daddr, &fl4->saddr);
 486
 487         rt = ip_route_output_key(&init_net, fl4);
 488         if (!IS_ERR(rt))
 489                 dst = &rt->dst;
 490
 491         /* If there is no association or if a source address is passed, no
 492          * more validation is required.
 493          */
 494         if (!asoc || saddr)
 495                 goto out;
 496
 497         bp = &asoc->base.bind_addr;
 498
 499         if (dst) {
 500                 /* Walk through the bind address list and look for a bind
 501                  * address that matches the source address of the returned dst.
 502                  */
 503                 sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
 504                 rcu_read_lock();
 505                 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 506                         if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
 507                             (laddr->state != SCTP_ADDR_SRC &&
 508                             !asoc->src_out_of_asoc_ok))
 509                                 continue;
 510                         if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 511                                 goto out_unlock;
 512                 }
 513                 rcu_read_unlock();
 514
 515                 /* None of the bound addresses match the source address of the
 516                  * dst. So release it.
 517                  */
 518                 dst_release(dst);
 519                 dst = NULL;
 520         }
 521
 522         /* Walk through the bind address list and try to get a dst that
 523          * matches a bind address as the source address.
 524          */
 525         rcu_read_lock();
 526         list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 527                 if (!laddr->valid)
 528                         continue;
 529                 if ((laddr->state == SCTP_ADDR_SRC) &&
 530                     (AF_INET == laddr->a.sa.sa_family)) {
 531                         fl4->saddr = laddr->a.v4.sin_addr.s_addr;
 532                         fl4->fl4_sport = laddr->a.v4.sin_port;
 533                         rt = ip_route_output_key(&init_net, fl4);
 534                         if (!IS_ERR(rt)) {
 535                                 dst = &rt->dst;
 536                                 goto out_unlock;
 537                         }
 538                 }
 539         }
 540
 541 out_unlock:
 542         rcu_read_unlock();
 543 out:
 544         t->dst = dst;
 545         if (dst)
 546                 SCTP_DEBUG_PRINTK("rt_dst:%pI4, rt_src:%pI4\n",
 547                                   &fl4->daddr, &fl4->saddr);
 548         else
 549                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
 550 }
 551
 552 /* For v4, the source address is cached in the route entry(dst). So no need
 553  * to cache it separately and hence this is an empty routine.
 554  */
 555 static void sctp_v4_get_saddr(struct sctp_sock *sk,
 556                               struct sctp_transport *t,
 557                               struct flowi *fl)
 558 {
 559         union sctp_addr *saddr = &t->saddr;
 560         struct rtable *rt = (struct rtable *)t->dst;
 561
 562         if (rt) {
 563                 saddr->v4.sin_family = AF_INET;
 564                 saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 565         }
 566 }
 567
 568 /* What interface did this skb arrive on? */
 569 static int sctp_v4_skb_iif(const struct sk_buff *skb)
 570 {
 571         return skb_rtable(skb)->rt_iif;
 572 }
 573
 574 /* Was this packet marked by Explicit Congestion Notification? */
 575 static int sctp_v4_is_ce(const struct sk_buff *skb)
 576 {
 577         return INET_ECN_is_ce(ip_hdr(skb)->tos);
 578 }
 579
 580 /* Create and initialize a new sk for the socket returned by accept(). */
 581 static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 582                                              struct sctp_association *asoc)
 583 {
 584         struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 585                         sk->sk_prot);
 586         struct inet_sock *newinet;
 587
 588         if (!newsk)
 589                 goto out;
 590
 591         sock_init_data(NULL, newsk);
 592
 593         sctp_copy_sock(newsk, sk, asoc);
 594         sock_reset_flag(newsk, SOCK_ZAPPED);
 595
 596         newinet = inet_sk(newsk);
 597
 598         newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 599
 600         sk_refcnt_debug_inc(newsk);
 601
 602         if (newsk->sk_prot->init(newsk)) {
 603                 sk_common_release(newsk);
 604                 newsk = NULL;
 605         }
 606
 607 out:
 608         return newsk;
 609 }
 610
 611 /* Map address, empty for v4 family */
 612 static void sctp_v4_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
 613 {
 614         /* Empty */
 615 }
 616
 617 /* Dump the v4 addr to the seq file. */
 618 static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 619 {
 620         seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 621 }
 622
 623 static void sctp_v4_ecn_capable(struct sock *sk)
 624 {
 625         INET_ECN_xmit(sk);
 626 }
 627
 628 void sctp_addr_wq_timeout_handler(unsigned long arg)
 629 {
 630         struct sctp_sockaddr_entry *addrw, *temp;
 631         struct sctp_sock *sp;
 632
 633         spin_lock_bh(&sctp_addr_wq_lock);
 634
 635         list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
 636                 SCTP_DEBUG_PRINTK_IPADDR("sctp_addrwq_timo_handler: the first ent in wq %p is ",
 637                     " for cmd %d at entry %p\n", &sctp_addr_waitq, &addrw->a, addrw->state,
 638                     addrw);
 639
 640 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 641                 /* Now we send an ASCONF for each association */
 642                 /* Note. we currently don't handle link local IPv6 addressees */
 643                 if (addrw->a.sa.sa_family == AF_INET6) {
 644                         struct in6_addr *in6;
 645
 646                         if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
 647                             IPV6_ADDR_LINKLOCAL)
 648                                 goto free_next;
 649
 650                         in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
 651                         if (ipv6_chk_addr(&init_net, in6, NULL, 0) == 0 &&
 652                             addrw->state == SCTP_ADDR_NEW) {
 653                                 unsigned long timeo_val;
 654
 655                                 SCTP_DEBUG_PRINTK("sctp_timo_handler: this is on DAD, trying %d sec later\n",
 656                                     SCTP_ADDRESS_TICK_DELAY);
 657                                 timeo_val = jiffies;
 658                                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 659                                 mod_timer(&sctp_addr_wq_timer, timeo_val);
 660                                 break;
 661                         }
 662                 }
 663 #endif
 664                 list_for_each_entry(sp, &sctp_auto_asconf_splist, auto_asconf_list) {
 665                         struct sock *sk;
 666
 667                         sk = sctp_opt2sk(sp);
 668                         /* ignore bound-specific endpoints */
 669                         if (!sctp_is_ep_boundall(sk))
 670                                 continue;
 671                         sctp_bh_lock_sock(sk);
 672                         if (sctp_asconf_mgmt(sp, addrw) < 0)
 673                                 SCTP_DEBUG_PRINTK("sctp_addrwq_timo_handler: sctp_asconf_mgmt failed\n");
 674                         sctp_bh_unlock_sock(sk);
 675                 }
 676 free_next:
 677                 list_del(&addrw->list);
 678                 kfree(addrw);
 679         }
 680         spin_unlock_bh(&sctp_addr_wq_lock);
 681 }
 682
 683 static void sctp_free_addr_wq(void)
 684 {
 685         struct sctp_sockaddr_entry *addrw;
 686         struct sctp_sockaddr_entry *temp;
 687
 688         spin_lock_bh(&sctp_addr_wq_lock);
 689         del_timer(&sctp_addr_wq_timer);
 690         list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
 691                 list_del(&addrw->list);
 692                 kfree(addrw);
 693         }
 694         spin_unlock_bh(&sctp_addr_wq_lock);
 695 }
 696
 697 /* lookup the entry for the same address in the addr_waitq
 698  * sctp_addr_wq MUST be locked
 699  */
 700 static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr)
 701 {
 702         struct sctp_sockaddr_entry *addrw;
 703
 704         list_for_each_entry(addrw, &sctp_addr_waitq, list) {
 705                 if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
 706                         continue;
 707                 if (addrw->a.sa.sa_family == AF_INET) {
 708                         if (addrw->a.v4.sin_addr.s_addr ==
 709                             addr->a.v4.sin_addr.s_addr)
 710                                 return addrw;
 711                 } else if (addrw->a.sa.sa_family == AF_INET6) {
 712                         if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
 713                             &addr->a.v6.sin6_addr))
 714                                 return addrw;
 715                 }
 716         }
 717         return NULL;
 718 }
 719
 720 void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd)
 721 {
 722         struct sctp_sockaddr_entry *addrw;
 723         unsigned long timeo_val;
 724
 725         /* first, we check if an opposite message already exist in the queue.
 726          * If we found such message, it is removed.
 727          * This operation is a bit stupid, but the DHCP client attaches the
 728          * new address after a couple of addition and deletion of that address
 729          */
 730
 731         spin_lock_bh(&sctp_addr_wq_lock);
 732         /* Offsets existing events in addr_wq */
 733         addrw = sctp_addr_wq_lookup(addr);
 734         if (addrw) {
 735                 if (addrw->state != cmd) {
 736                         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
 737                             " in wq %p\n", addrw->state, &addrw->a,
 738                             &sctp_addr_waitq);
 739                         list_del(&addrw->list);
 740                         kfree(addrw);
 741                 }
 742                 spin_unlock_bh(&sctp_addr_wq_lock);
 743                 return;
 744         }
 745
 746         /* OK, we have to add the new address to the wait queue */
 747         addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 748         if (addrw == NULL) {
 749                 spin_unlock_bh(&sctp_addr_wq_lock);
 750                 return;
 751         }
 752         addrw->state = cmd;
 753         list_add_tail(&addrw->list, &sctp_addr_waitq);
 754         SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
 755             " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq);
 756
 757         if (!timer_pending(&sctp_addr_wq_timer)) {
 758                 timeo_val = jiffies;
 759                 timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 760                 mod_timer(&sctp_addr_wq_timer, timeo_val);
 761         }
 762         spin_unlock_bh(&sctp_addr_wq_lock);
 763 }
 764
 765 /* Event handler for inet address addition/deletion events.
 766  * The sctp_local_addr_list needs to be protocted by a spin lock since
 767  * multiple notifiers (say IPv4 and IPv6) may be running at the same
 768  * time and thus corrupt the list.
 769  * The reader side is protected with RCU.
 770  */
 771 static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 772                                void *ptr)
 773 {
 774         struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 775         struct sctp_sockaddr_entry *addr = NULL;
 776         struct sctp_sockaddr_entry *temp;
 777         int found = 0;
 778
 779         if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
 780                 return NOTIFY_DONE;
 781
 782         switch (ev) {
 783         case NETDEV_UP:
 784                 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 785                 if (addr) {
 786                         addr->a.v4.sin_family = AF_INET;
 787                         addr->a.v4.sin_port = 0;
 788                         addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 789                         addr->valid = 1;
 790                         spin_lock_bh(&sctp_local_addr_lock);
 791                         list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 792                         sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
 793                         spin_unlock_bh(&sctp_local_addr_lock);
 794                 }
 795                 break;
 796         case NETDEV_DOWN:
 797                 spin_lock_bh(&sctp_local_addr_lock);
 798                 list_for_each_entry_safe(addr, temp,
 799                                         &sctp_local_addr_list, list) {
 800                         if (addr->a.sa.sa_family == AF_INET &&
 801                                         addr->a.v4.sin_addr.s_addr ==
 802                                         ifa->ifa_local) {
 803                                 sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
 804                                 found = 1;
 805                                 addr->valid = 0;
 806                                 list_del_rcu(&addr->list);
 807                                 break;
 808                         }
 809                 }
 810                 spin_unlock_bh(&sctp_local_addr_lock);
 811                 if (found)
 812                         kfree_rcu(addr, rcu);
 813                 break;
 814         }
 815
 816         return NOTIFY_DONE;
 817 }
 818
 819 /*
 820  * Initialize the control inode/socket with a control endpoint data
 821  * structure.  This endpoint is reserved exclusively for the OOTB processing.
 822  */
 823 static int sctp_ctl_sock_init(void)
 824 {
 825         int err;
 826         sa_family_t family = PF_INET;
 827
 828         if (sctp_get_pf_specific(PF_INET6))
 829                 family = PF_INET6;
 830
 831         err = inet_ctl_sock_create(&sctp_ctl_sock, family,
 832                                    SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
 833
 834         /* If IPv6 socket could not be created, try the IPv4 socket */
 835         if (err < 0 && family == PF_INET6)
 836                 err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
 837                                            SOCK_SEQPACKET, IPPROTO_SCTP,
 838                                            &init_net);
 839
 840         if (err < 0) {
 841                 pr_err("Failed to create the SCTP control socket\n");
 842                 return err;
 843         }
 844         return 0;
 845 }
 846
 847 /* Register address family specific functions. */
 848 int sctp_register_af(struct sctp_af *af)
 849 {
 850         switch (af->sa_family) {
 851         case AF_INET:
 852                 if (sctp_af_v4_specific)
 853                         return 0;
 854                 sctp_af_v4_specific = af;
 855                 break;
 856         case AF_INET6:
 857                 if (sctp_af_v6_specific)
 858                         return 0;
 859                 sctp_af_v6_specific = af;
 860                 break;
 861         default:
 862                 return 0;
 863         }
 864
 865         INIT_LIST_HEAD(&af->list);
 866         list_add_tail(&af->list, &sctp_address_families);
 867         return 1;
 868 }
 869
 870 /* Get the table of functions for manipulating a particular address
 871  * family.
 872  */
 873 struct sctp_af *sctp_get_af_specific(sa_family_t family)
 874 {
 875         switch (family) {
 876         case AF_INET:
 877                 return sctp_af_v4_specific;
 878         case AF_INET6:
 879                 return sctp_af_v6_specific;
 880         default:
 881                 return NULL;
 882         }
 883 }
 884
 885 /* Common code to initialize a AF_INET msg_name. */
 886 static void sctp_inet_msgname(char *msgname, int *addr_len)
 887 {
 888         struct sockaddr_in *sin;
 889
 890         sin = (struct sockaddr_in *)msgname;
 891         *addr_len = sizeof(struct sockaddr_in);
 892         sin->sin_family = AF_INET;
 893         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 894 }
 895
 896 /* Copy the primary address of the peer primary address as the msg_name. */
 897 static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 898                                     int *addr_len)
 899 {
 900         struct sockaddr_in *sin, *sinfrom;
 901
 902         if (msgname) {
 903                 struct sctp_association *asoc;
 904
 905                 asoc = event->asoc;
 906                 sctp_inet_msgname(msgname, addr_len);
 907                 sin = (struct sockaddr_in *)msgname;
 908                 sinfrom = &asoc->peer.primary_addr.v4;
 909                 sin->sin_port = htons(asoc->peer.port);
 910                 sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 911         }
 912 }
 913
 914 /* Initialize and copy out a msgname from an inbound skb. */
 915 static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 916 {
 917         if (msgname) {
 918                 struct sctphdr *sh = sctp_hdr(skb);
 919                 struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 920
 921                 sctp_inet_msgname(msgname, len);
 922                 sin->sin_port = sh->source;
 923                 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 924         }
 925 }
 926
 927 /* Do we support this AF? */
 928 static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 929 {
 930         /* PF_INET only supports AF_INET addresses. */
 931         return AF_INET == family;
 932 }
 933
 934 /* Address matching with wildcards allowed. */
 935 static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 936                               const union sctp_addr *addr2,
 937                               struct sctp_sock *opt)
 938 {
 939         /* PF_INET only supports AF_INET addresses. */
 940         if (addr1->sa.sa_family != addr2->sa.sa_family)
 941                 return 0;
 942         if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 943             htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 944                 return 1;
 945         if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 946                 return 1;
 947
 948         return 0;
 949 }
 950
 951 /* Verify that provided sockaddr looks bindable.  Common verification has
 952  * already been taken care of.
 953  */
 954 static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 955 {
 956         return sctp_v4_available(addr, opt);
 957 }
 958
 959 /* Verify that sockaddr looks sendable.  Common verification has already
 960  * been taken care of.
 961  */
 962 static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 963 {
 964         return 1;
 965 }
 966
 967 /* Fill in Supported Address Type information for INIT and INIT-ACK
 968  * chunks.  Returns number of addresses supported.
 969  */
 970 static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 971                                      __be16 *types)
 972 {
 973         types[0] = SCTP_PARAM_IPV4_ADDRESS;
 974         return 1;
 975 }
 976
 977 /* Wrapper routine that calls the ip transmit routine. */
 978 static inline int sctp_v4_xmit(struct sk_buff *skb,
 979                                struct sctp_transport *transport)
 980 {
 981         struct inet_sock *inet = inet_sk(skb->sk);
 982
 983         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 984                           __func__, skb, skb->len,
 985                           &transport->fl.u.ip4.saddr,
 986                           &transport->fl.u.ip4.daddr);
 987
 988         inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 989                          IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 990
 991         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 992         return ip_queue_xmit(skb, &transport->fl);
 993 }
 994
 995 static struct sctp_af sctp_af_inet;
 996
 997 static struct sctp_pf sctp_pf_inet = {
 998         .event_msgname = sctp_inet_event_msgname,
 999         .skb_msgname   = sctp_inet_skb_msgname,
1000         .af_supported  = sctp_inet_af_supported,
1001         .cmp_addr      = sctp_inet_cmp_addr,
1002         .bind_verify   = sctp_inet_bind_verify,
1003         .send_verify   = sctp_inet_send_verify,
1004         .supported_addrs = sctp_inet_supported_addrs,
1005         .create_accept_sk = sctp_v4_create_accept_sk,
1006         .addr_v4map     = sctp_v4_addr_v4map,
1007         .af            = &sctp_af_inet
1008 };
1009
1010 /* Notifier for inetaddr addition/deletion events.  */
1011 static struct notifier_block sctp_inetaddr_notifier = {
1012         .notifier_call = sctp_inetaddr_event,
1013 };
1014
1015 /* Socket operations.  */
1016 static const struct proto_ops inet_seqpacket_ops = {
1017         .family            = PF_INET,
1018         .owner             = THIS_MODULE,
1019         .release           = inet_release,      /* Needs to be wrapped... */
1020         .bind              = inet_bind,
1021         .connect           = inet_dgram_connect,
1022         .socketpair        = sock_no_socketpair,
1023         .accept            = inet_accept,
1024         .getname           = inet_getname,      /* Semantics are different.  */
1025         .poll              = sctp_poll,
1026         .ioctl             = inet_ioctl,
1027         .listen            = sctp_inet_listen,
1028         .shutdown          = inet_shutdown,     /* Looks harmless.  */
1029         .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1030         .getsockopt        = sock_common_getsockopt,
1031         .sendmsg           = inet_sendmsg,
1032         .recvmsg           = sock_common_recvmsg,
1033         .mmap              = sock_no_mmap,
1034         .sendpage          = sock_no_sendpage,
1035 #ifdef CONFIG_COMPAT
1036         .compat_setsockopt = compat_sock_common_setsockopt,
1037         .compat_getsockopt = compat_sock_common_getsockopt,
1038 #endif
1039 };
1040
1041 /* Registration with AF_INET family.  */
1042 static struct inet_protosw sctp_seqpacket_protosw = {
1043         .type       = SOCK_SEQPACKET,
1044         .protocol   = IPPROTO_SCTP,
1045         .prot       = &sctp_prot,
1046         .ops        = &inet_seqpacket_ops,
1047         .no_check   = 0,
1048         .flags      = SCTP_PROTOSW_FLAG
1049 };
1050 static struct inet_protosw sctp_stream_protosw = {
1051         .type       = SOCK_STREAM,
1052         .protocol   = IPPROTO_SCTP,
1053         .prot       = &sctp_prot,
1054         .ops        = &inet_seqpacket_ops,
1055         .no_check   = 0,
1056         .flags      = SCTP_PROTOSW_FLAG
1057 };
1058
1059 /* Register with IP layer.  */
1060 static const struct net_protocol sctp_protocol = {
1061         .handler     = sctp_rcv,
1062         .err_handler = sctp_v4_err,
1063         .no_policy   = 1,
1064 };
1065
1066 /* IPv4 address related functions.  */
1067 static struct sctp_af sctp_af_inet = {
1068         .sa_family         = AF_INET,
1069         .sctp_xmit         = sctp_v4_xmit,
1070         .setsockopt        = ip_setsockopt,
1071         .getsockopt        = ip_getsockopt,
1072         .get_dst           = sctp_v4_get_dst,
1073         .get_saddr         = sctp_v4_get_saddr,
1074         .copy_addrlist     = sctp_v4_copy_addrlist,
1075         .from_skb          = sctp_v4_from_skb,
1076         .from_sk           = sctp_v4_from_sk,
1077         .to_sk_saddr       = sctp_v4_to_sk_saddr,
1078         .to_sk_daddr       = sctp_v4_to_sk_daddr,
1079         .from_addr_param   = sctp_v4_from_addr_param,
1080         .to_addr_param     = sctp_v4_to_addr_param,
1081         .cmp_addr          = sctp_v4_cmp_addr,
1082         .addr_valid        = sctp_v4_addr_valid,
1083         .inaddr_any        = sctp_v4_inaddr_any,
1084         .is_any            = sctp_v4_is_any,
1085         .available         = sctp_v4_available,
1086         .scope             = sctp_v4_scope,
1087         .skb_iif           = sctp_v4_skb_iif,
1088         .is_ce             = sctp_v4_is_ce,
1089         .seq_dump_addr     = sctp_v4_seq_dump_addr,
1090         .ecn_capable       = sctp_v4_ecn_capable,
1091         .net_header_len    = sizeof(struct iphdr),
1092         .sockaddr_len      = sizeof(struct sockaddr_in),
1093 #ifdef CONFIG_COMPAT
1094         .compat_setsockopt = compat_ip_setsockopt,
1095         .compat_getsockopt = compat_ip_getsockopt,
1096 #endif
1097 };
1098
1099 struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1100
1101         switch (family) {
1102         case PF_INET:
1103                 return sctp_pf_inet_specific;
1104         case PF_INET6:
1105                 return sctp_pf_inet6_specific;
1106         default:
1107                 return NULL;
1108         }
1109 }
1110
1111 /* Register the PF specific function table.  */
1112 int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1113 {
1114         switch (family) {
1115         case PF_INET:
1116                 if (sctp_pf_inet_specific)
1117                         return 0;
1118                 sctp_pf_inet_specific = pf;
1119                 break;
1120         case PF_INET6:
1121                 if (sctp_pf_inet6_specific)
1122                         return 0;
1123                 sctp_pf_inet6_specific = pf;
1124                 break;
1125         default:
1126                 return 0;
1127         }
1128         return 1;
1129 }
1130
1131 static inline int init_sctp_mibs(void)
1132 {
1133         return snmp_mib_init((void __percpu **)sctp_statistics,
1134                              sizeof(struct sctp_mib),
1135                              __alignof__(struct sctp_mib));
1136 }
1137
1138 static inline void cleanup_sctp_mibs(void)
1139 {
1140         snmp_mib_free((void __percpu **)sctp_statistics);
1141 }
1142
1143 static void sctp_v4_pf_init(void)
1144 {
1145         /* Initialize the SCTP specific PF functions. */
1146         sctp_register_pf(&sctp_pf_inet, PF_INET);
1147         sctp_register_af(&sctp_af_inet);
1148 }
1149
1150 static void sctp_v4_pf_exit(void)
1151 {
1152         list_del(&sctp_af_inet.list);
1153 }
1154
1155 static int sctp_v4_protosw_init(void)
1156 {
1157         int rc;
1158
1159         rc = proto_register(&sctp_prot, 1);
1160         if (rc)
1161                 return rc;
1162
1163         /* Register SCTP(UDP and TCP style) with socket layer.  */
1164         inet_register_protosw(&sctp_seqpacket_protosw);
1165         inet_register_protosw(&sctp_stream_protosw);
1166
1167         return 0;
1168 }
1169
1170 static void sctp_v4_protosw_exit(void)
1171 {
1172         inet_unregister_protosw(&sctp_stream_protosw);
1173         inet_unregister_protosw(&sctp_seqpacket_protosw);
1174         proto_unregister(&sctp_prot);
1175 }
1176
1177 static int sctp_v4_add_protocol(void)
1178 {
1179         /* Register notifier for inet address additions/deletions. */
1180         register_inetaddr_notifier(&sctp_inetaddr_notifier);
1181
1182         /* Register SCTP with inet layer.  */
1183         if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1184                 return -EAGAIN;
1185
1186         return 0;
1187 }
1188
1189 static void sctp_v4_del_protocol(void)
1190 {
1191         inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1192         unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1193 }
1194
1195 /* Initialize the universe into something sensible.  */
1196 SCTP_STATIC __init int sctp_init(void)
1197 {
1198         int i;
1199         int status = -EINVAL;
1200         unsigned long goal;
1201         unsigned long limit;
1202         int max_share;
1203         int order;
1204
1205         /* SCTP_DEBUG sanity check. */
1206         if (!sctp_sanity_check())
1207                 goto out;
1208
1209         /* Allocate bind_bucket and chunk caches. */
1210         status = -ENOBUFS;
1211         sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1212                                                sizeof(struct sctp_bind_bucket),
1213                                                0, SLAB_HWCACHE_ALIGN,
1214                                                NULL);
1215         if (!sctp_bucket_cachep)
1216                 goto out;
1217
1218         sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1219                                                sizeof(struct sctp_chunk),
1220                                                0, SLAB_HWCACHE_ALIGN,
1221                                                NULL);
1222         if (!sctp_chunk_cachep)
1223                 goto err_chunk_cachep;
1224
1225         /* Allocate and initialise sctp mibs.  */
1226         status = init_sctp_mibs();
1227         if (status)
1228                 goto err_init_mibs;
1229
1230         /* Initialize proc fs directory.  */
1231         status = sctp_proc_init();
1232         if (status)
1233                 goto err_init_proc;
1234
1235         /* Initialize object count debugging.  */
1236         sctp_dbg_objcnt_init();
1237
1238         /*
1239          * 14. Suggested SCTP Protocol Parameter Values
1240          */
1241         /* The following protocol parameters are RECOMMENDED:  */
1242         /* RTO.Initial              - 3  seconds */
1243         sctp_rto_initial                = SCTP_RTO_INITIAL;
1244         /* RTO.Min                  - 1  second */
1245         sctp_rto_min                    = SCTP_RTO_MIN;
1246         /* RTO.Max                 -  60 seconds */
1247         sctp_rto_max                    = SCTP_RTO_MAX;
1248         /* RTO.Alpha                - 1/8 */
1249         sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1250         /* RTO.Beta                 - 1/4 */
1251         sctp_rto_beta                   = SCTP_RTO_BETA;
1252
1253         /* Valid.Cookie.Life        - 60  seconds */
1254         sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1255
1256         /* Whether Cookie Preservative is enabled(1) or not(0) */
1257         sctp_cookie_preserve_enable     = 1;
1258
1259         /* Max.Burst                - 4 */
1260         sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1261
1262         /* Association.Max.Retrans  - 10 attempts
1263          * Path.Max.Retrans         - 5  attempts (per destination address)
1264          * Max.Init.Retransmits     - 8  attempts
1265          */
1266         sctp_max_retrans_association    = 10;
1267         sctp_max_retrans_path           = 5;
1268         sctp_max_retrans_init           = 8;
1269
1270         /* Sendbuffer growth        - do per-socket accounting */
1271         sctp_sndbuf_policy              = 0;
1272
1273         /* Rcvbuffer growth         - do per-socket accounting */
1274         sctp_rcvbuf_policy              = 0;
1275
1276         /* HB.interval              - 30 seconds */
1277         sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1278
1279         /* delayed SACK timeout */
1280         sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1281
1282         /* Implementation specific variables. */
1283
1284         /* Initialize default stream count setup information. */
1285         sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1286         sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1287
1288         /* Initialize handle used for association ids. */
1289         idr_init(&sctp_assocs_id);
1290
1291         limit = nr_free_buffer_pages() / 8;
1292         limit = max(limit, 128UL);
1293         sysctl_sctp_mem[0] = limit / 4 * 3;
1294         sysctl_sctp_mem[1] = limit;
1295         sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1296
1297         /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1298         limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1299         max_share = min(4UL*1024*1024, limit);
1300
1301         sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1302         sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1303         sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1304
1305         sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1306         sysctl_sctp_wmem[1] = 16*1024;
1307         sysctl_sctp_wmem[2] = max(64*1024, max_share);
1308
1309         /* Size and allocate the association hash table.
1310          * The methodology is similar to that of the tcp hash tables.
1311          */
1312         if (totalram_pages >= (128 * 1024))
1313                 goal = totalram_pages >> (22 - PAGE_SHIFT);
1314         else
1315                 goal = totalram_pages >> (24 - PAGE_SHIFT);
1316
1317         for (order = 0; (1UL << order) < goal; order++)
1318                 ;
1319
1320         do {
1321                 sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1322                                         sizeof(struct sctp_hashbucket);
1323                 if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1324                         continue;
1325                 sctp_assoc_hashtable = (struct sctp_hashbucket *)
1326                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1327         } while (!sctp_assoc_hashtable && --order > 0);
1328         if (!sctp_assoc_hashtable) {
1329                 pr_err("Failed association hash alloc\n");
1330                 status = -ENOMEM;
1331                 goto err_ahash_alloc;
1332         }
1333         for (i = 0; i < sctp_assoc_hashsize; i++) {
1334                 rwlock_init(&sctp_assoc_hashtable[i].lock);
1335                 INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1336         }
1337
1338         /* Allocate and initialize the endpoint hash table.  */
1339         sctp_ep_hashsize = 64;
1340         sctp_ep_hashtable = (struct sctp_hashbucket *)
1341                 kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1342         if (!sctp_ep_hashtable) {
1343                 pr_err("Failed endpoint_hash alloc\n");
1344                 status = -ENOMEM;
1345                 goto err_ehash_alloc;
1346         }
1347         for (i = 0; i < sctp_ep_hashsize; i++) {
1348                 rwlock_init(&sctp_ep_hashtable[i].lock);
1349                 INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1350         }
1351
1352         /* Allocate and initialize the SCTP port hash table.  */
1353         do {
1354                 sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1355                                         sizeof(struct sctp_bind_hashbucket);
1356                 if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1357                         continue;
1358                 sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1359                         __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1360         } while (!sctp_port_hashtable && --order > 0);
1361         if (!sctp_port_hashtable) {
1362                 pr_err("Failed bind hash alloc\n");
1363                 status = -ENOMEM;
1364                 goto err_bhash_alloc;
1365         }
1366         for (i = 0; i < sctp_port_hashsize; i++) {
1367                 spin_lock_init(&sctp_port_hashtable[i].lock);
1368                 INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1369         }
1370
1371         pr_info("Hash tables configured (established %d bind %d)\n",
1372                 sctp_assoc_hashsize, sctp_port_hashsize);
1373
1374         /* Disable ADDIP by default. */
1375         sctp_addip_enable = 0;
1376         sctp_addip_noauth = 0;
1377         sctp_default_auto_asconf = 0;
1378
1379         /* Enable PR-SCTP by default. */
1380         sctp_prsctp_enable = 1;
1381
1382         /* Disable AUTH by default. */
1383         sctp_auth_enable = 0;
1384
1385         /* Set SCOPE policy to enabled */
1386         sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1387
1388         /* Set the default rwnd update threshold */
1389         sctp_rwnd_upd_shift             = SCTP_DEFAULT_RWND_SHIFT;
1390
1391         sctp_sysctl_register();
1392
1393         INIT_LIST_HEAD(&sctp_address_families);
1394         sctp_v4_pf_init();
1395         sctp_v6_pf_init();
1396
1397         /* Initialize the local address list. */
1398         INIT_LIST_HEAD(&sctp_local_addr_list);
1399         spin_lock_init(&sctp_local_addr_lock);
1400         sctp_get_local_addr_list();
1401
1402         /* Initialize the address event list */
1403         INIT_LIST_HEAD(&sctp_addr_waitq);
1404         INIT_LIST_HEAD(&sctp_auto_asconf_splist);
1405         spin_lock_init(&sctp_addr_wq_lock);
1406         sctp_addr_wq_timer.expires = 0;
1407         setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1408
1409         status = sctp_v4_protosw_init();
1410
1411         if (status)
1412                 goto err_protosw_init;
1413
1414         status = sctp_v6_protosw_init();
1415         if (status)
1416                 goto err_v6_protosw_init;
1417
1418         /* Initialize the control inode/socket for handling OOTB packets.  */
1419         if ((status = sctp_ctl_sock_init())) {
1420                 pr_err("Failed to initialize the SCTP control sock\n");
1421                 goto err_ctl_sock_init;
1422         }
1423
1424         status = sctp_v4_add_protocol();
1425         if (status)
1426                 goto err_add_protocol;
1427
1428         /* Register SCTP with inet6 layer.  */
1429         status = sctp_v6_add_protocol();
1430         if (status)
1431                 goto err_v6_add_protocol;
1432
1433         status = 0;
1434 out:
1435         return status;
1436 err_v6_add_protocol:
1437         sctp_v4_del_protocol();
1438 err_add_protocol:
1439         inet_ctl_sock_destroy(sctp_ctl_sock);
1440 err_ctl_sock_init:
1441         sctp_v6_protosw_exit();
1442 err_v6_protosw_init:
1443         sctp_v4_protosw_exit();
1444 err_protosw_init:
1445         sctp_free_local_addr_list();
1446         sctp_v4_pf_exit();
1447         sctp_v6_pf_exit();
1448         sctp_sysctl_unregister();
1449         free_pages((unsigned long)sctp_port_hashtable,
1450                    get_order(sctp_port_hashsize *
1451                              sizeof(struct sctp_bind_hashbucket)));
1452 err_bhash_alloc:
1453         kfree(sctp_ep_hashtable);
1454 err_ehash_alloc:
1455         free_pages((unsigned long)sctp_assoc_hashtable,
1456                    get_order(sctp_assoc_hashsize *
1457                              sizeof(struct sctp_hashbucket)));
1458 err_ahash_alloc:
1459         sctp_dbg_objcnt_exit();
1460         sctp_proc_exit();
1461 err_init_proc:
1462         cleanup_sctp_mibs();
1463 err_init_mibs:
1464         kmem_cache_destroy(sctp_chunk_cachep);
1465 err_chunk_cachep:
1466         kmem_cache_destroy(sctp_bucket_cachep);
1467         goto out;
1468 }
1469
1470 /* Exit handler for the SCTP protocol.  */
1471 SCTP_STATIC __exit void sctp_exit(void)
1472 {
1473         /* BUG.  This should probably do something useful like clean
1474          * up all the remaining associations and all that memory.
1475          */
1476
1477         /* Unregister with inet6/inet layers. */
1478         sctp_v6_del_protocol();
1479         sctp_v4_del_protocol();
1480         sctp_free_addr_wq();
1481
1482         /* Free the control endpoint.  */
1483         inet_ctl_sock_destroy(sctp_ctl_sock);
1484
1485         /* Free protosw registrations */
1486         sctp_v6_protosw_exit();
1487         sctp_v4_protosw_exit();
1488
1489         /* Free the local address list.  */
1490         sctp_free_local_addr_list();
1491
1492         /* Unregister with socket layer. */
1493         sctp_v6_pf_exit();
1494         sctp_v4_pf_exit();
1495
1496         sctp_sysctl_unregister();
1497
1498         free_pages((unsigned long)sctp_assoc_hashtable,
1499                    get_order(sctp_assoc_hashsize *
1500                              sizeof(struct sctp_hashbucket)));
1501         kfree(sctp_ep_hashtable);
1502         free_pages((unsigned long)sctp_port_hashtable,
1503                    get_order(sctp_port_hashsize *
1504                              sizeof(struct sctp_bind_hashbucket)));
1505
1506         sctp_dbg_objcnt_exit();
1507         sctp_proc_exit();
1508         cleanup_sctp_mibs();
1509
1510         rcu_barrier(); /* Wait for completion of call_rcu()'s */
1511
1512         kmem_cache_destroy(sctp_chunk_cachep);
1513         kmem_cache_destroy(sctp_bucket_cachep);
1514 }
1515
1516 module_init(sctp_init);
1517 module_exit(sctp_exit);
1518
1519 /*
1520  * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1521  */
1522 MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1523 MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1524 MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1525 MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1526 module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1527 MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1528 MODULE_LICENSE("GPL");