linux/net/sctp/protocol.c
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   1/* SCTP kernel implementation
   2 * (C) Copyright IBM Corp. 2001, 2004
   3 * Copyright (c) 1999-2000 Cisco, Inc.
   4 * Copyright (c) 1999-2001 Motorola, Inc.
   5 * Copyright (c) 2001 Intel Corp.
   6 * Copyright (c) 2001 Nokia, Inc.
   7 * Copyright (c) 2001 La Monte H.P. Yarroll
   8 *
   9 * This file is part of the SCTP kernel implementation
  10 *
  11 * Initialization/cleanup for SCTP protocol support.
  12 *
  13 * This SCTP implementation is free software;
  14 * you can redistribute it and/or modify it under the terms of
  15 * the GNU General Public License as published by
  16 * the Free Software Foundation; either version 2, or (at your option)
  17 * any later version.
  18 *
  19 * This SCTP implementation is distributed in the hope that it
  20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  21 *                 ************************
  22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  23 * See the GNU General Public License for more details.
  24 *
  25 * You should have received a copy of the GNU General Public License
  26 * along with GNU CC; see the file COPYING.  If not, write to
  27 * the Free Software Foundation, 59 Temple Place - Suite 330,
  28 * Boston, MA 02111-1307, USA.
  29 *
  30 * Please send any bug reports or fixes you make to the
  31 * email address(es):
  32 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  33 *
  34 * Or submit a bug report through the following website:
  35 *    http://www.sf.net/projects/lksctp
  36 *
  37 * Written or modified by:
  38 *    La Monte H.P. Yarroll <piggy@acm.org>
  39 *    Karl Knutson <karl@athena.chicago.il.us>
  40 *    Jon Grimm <jgrimm@us.ibm.com>
  41 *    Sridhar Samudrala <sri@us.ibm.com>
  42 *    Daisy Chang <daisyc@us.ibm.com>
  43 *    Ardelle Fan <ardelle.fan@intel.com>
  44 *
  45 * Any bugs reported given to us we will try to fix... any fixes shared will
  46 * be incorporated into the next SCTP release.
  47 */
  48
  49#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  50
  51#include <linux/module.h>
  52#include <linux/init.h>
  53#include <linux/netdevice.h>
  54#include <linux/inetdevice.h>
  55#include <linux/seq_file.h>
  56#include <linux/bootmem.h>
  57#include <linux/highmem.h>
  58#include <linux/swap.h>
  59#include <linux/slab.h>
  60#include <net/net_namespace.h>
  61#include <net/protocol.h>
  62#include <net/ip.h>
  63#include <net/ipv6.h>
  64#include <net/route.h>
  65#include <net/sctp/sctp.h>
  66#include <net/addrconf.h>
  67#include <net/inet_common.h>
  68#include <net/inet_ecn.h>
  69
  70/* Global data structures. */
  71struct sctp_globals sctp_globals __read_mostly;
  72DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics) __read_mostly;
  73
  74#ifdef CONFIG_PROC_FS
  75struct proc_dir_entry   *proc_net_sctp;
  76#endif
  77
  78struct idr sctp_assocs_id;
  79DEFINE_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 */
  85static struct sock *sctp_ctl_sock;
  86
  87static struct sctp_pf *sctp_pf_inet6_specific;
  88static struct sctp_pf *sctp_pf_inet_specific;
  89static struct sctp_af *sctp_af_v4_specific;
  90static struct sctp_af *sctp_af_v6_specific;
  91
  92struct kmem_cache *sctp_chunk_cachep __read_mostly;
  93struct kmem_cache *sctp_bucket_cachep __read_mostly;
  94
  95long sysctl_sctp_mem[3];
  96int sysctl_sctp_rmem[3];
  97int sysctl_sctp_wmem[3];
  98
  99/* Return the address of the control sock. */
 100struct 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. */
 106static __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
 128out_remaddr_proc_init:
 129        sctp_assocs_proc_exit();
 130out_assocs_proc_init:
 131        sctp_eps_proc_exit();
 132out_eps_proc_init:
 133        sctp_snmp_proc_exit();
 134out_snmp_proc_init:
 135        if (proc_net_sctp) {
 136                proc_net_sctp = NULL;
 137                remove_proc_entry("sctp", init_net.proc_net);
 138        }
 139out_free_percpu:
 140        percpu_counter_destroy(&sctp_sockets_allocated);
 141#else
 142        return 0;
 143#endif /* CONFIG_PROC_FS */
 144
 145out_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 */
 153static 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 */
 172static 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 */
 204static 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.  */
 221static 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'.  */
 234int 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
 262end_copy:
 263        rcu_read_unlock();
 264        return error;
 265}
 266
 267/* Initialize a sctp_addr from in incoming skb.  */
 268static 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. */
 290static 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. */
 298static 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. */
 304static 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. */
 310static 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 */
 322static 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. */
 335static 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. */
 344static 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. */
 358static 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? */
 366static 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 */
 378static 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?   */
 398static 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 */
 432static 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 */
 458static 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
 541out_unlock:
 542        rcu_read_unlock();
 543out:
 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 */
 555static 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? */
 569static int sctp_v4_skb_iif(const struct sk_buff *skb)
 570{
 571        return inet_iif(skb);
 572}
 573
 574/* Was this packet marked by Explicit Congestion Notification? */
 575static 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(). */
 581static 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
 607out:
 608        return newsk;
 609}
 610
 611/* Map address, empty for v4 family */
 612static 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. */
 618static 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
 623static void sctp_v4_ecn_capable(struct sock *sk)
 624{
 625        INET_ECN_xmit(sk);
 626}
 627
 628void 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 IS_ENABLED(CONFIG_IPV6)
 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#if IS_ENABLED(CONFIG_IPV6)
 677free_next:
 678#endif
 679                list_del(&addrw->list);
 680                kfree(addrw);
 681        }
 682        spin_unlock_bh(&sctp_addr_wq_lock);
 683}
 684
 685static void sctp_free_addr_wq(void)
 686{
 687        struct sctp_sockaddr_entry *addrw;
 688        struct sctp_sockaddr_entry *temp;
 689
 690        spin_lock_bh(&sctp_addr_wq_lock);
 691        del_timer(&sctp_addr_wq_timer);
 692        list_for_each_entry_safe(addrw, temp, &sctp_addr_waitq, list) {
 693                list_del(&addrw->list);
 694                kfree(addrw);
 695        }
 696        spin_unlock_bh(&sctp_addr_wq_lock);
 697}
 698
 699/* lookup the entry for the same address in the addr_waitq
 700 * sctp_addr_wq MUST be locked
 701 */
 702static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct sctp_sockaddr_entry *addr)
 703{
 704        struct sctp_sockaddr_entry *addrw;
 705
 706        list_for_each_entry(addrw, &sctp_addr_waitq, list) {
 707                if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
 708                        continue;
 709                if (addrw->a.sa.sa_family == AF_INET) {
 710                        if (addrw->a.v4.sin_addr.s_addr ==
 711                            addr->a.v4.sin_addr.s_addr)
 712                                return addrw;
 713                } else if (addrw->a.sa.sa_family == AF_INET6) {
 714                        if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
 715                            &addr->a.v6.sin6_addr))
 716                                return addrw;
 717                }
 718        }
 719        return NULL;
 720}
 721
 722void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *addr, int cmd)
 723{
 724        struct sctp_sockaddr_entry *addrw;
 725        unsigned long timeo_val;
 726
 727        /* first, we check if an opposite message already exist in the queue.
 728         * If we found such message, it is removed.
 729         * This operation is a bit stupid, but the DHCP client attaches the
 730         * new address after a couple of addition and deletion of that address
 731         */
 732
 733        spin_lock_bh(&sctp_addr_wq_lock);
 734        /* Offsets existing events in addr_wq */
 735        addrw = sctp_addr_wq_lookup(addr);
 736        if (addrw) {
 737                if (addrw->state != cmd) {
 738                        SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt offsets existing entry for %d ",
 739                            " in wq %p\n", addrw->state, &addrw->a,
 740                            &sctp_addr_waitq);
 741                        list_del(&addrw->list);
 742                        kfree(addrw);
 743                }
 744                spin_unlock_bh(&sctp_addr_wq_lock);
 745                return;
 746        }
 747
 748        /* OK, we have to add the new address to the wait queue */
 749        addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 750        if (addrw == NULL) {
 751                spin_unlock_bh(&sctp_addr_wq_lock);
 752                return;
 753        }
 754        addrw->state = cmd;
 755        list_add_tail(&addrw->list, &sctp_addr_waitq);
 756        SCTP_DEBUG_PRINTK_IPADDR("sctp_addr_wq_mgmt add new entry for cmd:%d ",
 757            " in wq %p\n", addrw->state, &addrw->a, &sctp_addr_waitq);
 758
 759        if (!timer_pending(&sctp_addr_wq_timer)) {
 760                timeo_val = jiffies;
 761                timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 762                mod_timer(&sctp_addr_wq_timer, timeo_val);
 763        }
 764        spin_unlock_bh(&sctp_addr_wq_lock);
 765}
 766
 767/* Event handler for inet address addition/deletion events.
 768 * The sctp_local_addr_list needs to be protocted by a spin lock since
 769 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 770 * time and thus corrupt the list.
 771 * The reader side is protected with RCU.
 772 */
 773static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 774                               void *ptr)
 775{
 776        struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 777        struct sctp_sockaddr_entry *addr = NULL;
 778        struct sctp_sockaddr_entry *temp;
 779        int found = 0;
 780
 781        if (!net_eq(dev_net(ifa->ifa_dev->dev), &init_net))
 782                return NOTIFY_DONE;
 783
 784        switch (ev) {
 785        case NETDEV_UP:
 786                addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 787                if (addr) {
 788                        addr->a.v4.sin_family = AF_INET;
 789                        addr->a.v4.sin_port = 0;
 790                        addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 791                        addr->valid = 1;
 792                        spin_lock_bh(&sctp_local_addr_lock);
 793                        list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
 794                        sctp_addr_wq_mgmt(addr, SCTP_ADDR_NEW);
 795                        spin_unlock_bh(&sctp_local_addr_lock);
 796                }
 797                break;
 798        case NETDEV_DOWN:
 799                spin_lock_bh(&sctp_local_addr_lock);
 800                list_for_each_entry_safe(addr, temp,
 801                                        &sctp_local_addr_list, list) {
 802                        if (addr->a.sa.sa_family == AF_INET &&
 803                                        addr->a.v4.sin_addr.s_addr ==
 804                                        ifa->ifa_local) {
 805                                sctp_addr_wq_mgmt(addr, SCTP_ADDR_DEL);
 806                                found = 1;
 807                                addr->valid = 0;
 808                                list_del_rcu(&addr->list);
 809                                break;
 810                        }
 811                }
 812                spin_unlock_bh(&sctp_local_addr_lock);
 813                if (found)
 814                        kfree_rcu(addr, rcu);
 815                break;
 816        }
 817
 818        return NOTIFY_DONE;
 819}
 820
 821/*
 822 * Initialize the control inode/socket with a control endpoint data
 823 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 824 */
 825static int sctp_ctl_sock_init(void)
 826{
 827        int err;
 828        sa_family_t family = PF_INET;
 829
 830        if (sctp_get_pf_specific(PF_INET6))
 831                family = PF_INET6;
 832
 833        err = inet_ctl_sock_create(&sctp_ctl_sock, family,
 834                                   SOCK_SEQPACKET, IPPROTO_SCTP, &init_net);
 835
 836        /* If IPv6 socket could not be created, try the IPv4 socket */
 837        if (err < 0 && family == PF_INET6)
 838                err = inet_ctl_sock_create(&sctp_ctl_sock, AF_INET,
 839                                           SOCK_SEQPACKET, IPPROTO_SCTP,
 840                                           &init_net);
 841
 842        if (err < 0) {
 843                pr_err("Failed to create the SCTP control socket\n");
 844                return err;
 845        }
 846        return 0;
 847}
 848
 849/* Register address family specific functions. */
 850int sctp_register_af(struct sctp_af *af)
 851{
 852        switch (af->sa_family) {
 853        case AF_INET:
 854                if (sctp_af_v4_specific)
 855                        return 0;
 856                sctp_af_v4_specific = af;
 857                break;
 858        case AF_INET6:
 859                if (sctp_af_v6_specific)
 860                        return 0;
 861                sctp_af_v6_specific = af;
 862                break;
 863        default:
 864                return 0;
 865        }
 866
 867        INIT_LIST_HEAD(&af->list);
 868        list_add_tail(&af->list, &sctp_address_families);
 869        return 1;
 870}
 871
 872/* Get the table of functions for manipulating a particular address
 873 * family.
 874 */
 875struct sctp_af *sctp_get_af_specific(sa_family_t family)
 876{
 877        switch (family) {
 878        case AF_INET:
 879                return sctp_af_v4_specific;
 880        case AF_INET6:
 881                return sctp_af_v6_specific;
 882        default:
 883                return NULL;
 884        }
 885}
 886
 887/* Common code to initialize a AF_INET msg_name. */
 888static void sctp_inet_msgname(char *msgname, int *addr_len)
 889{
 890        struct sockaddr_in *sin;
 891
 892        sin = (struct sockaddr_in *)msgname;
 893        *addr_len = sizeof(struct sockaddr_in);
 894        sin->sin_family = AF_INET;
 895        memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 896}
 897
 898/* Copy the primary address of the peer primary address as the msg_name. */
 899static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 900                                    int *addr_len)
 901{
 902        struct sockaddr_in *sin, *sinfrom;
 903
 904        if (msgname) {
 905                struct sctp_association *asoc;
 906
 907                asoc = event->asoc;
 908                sctp_inet_msgname(msgname, addr_len);
 909                sin = (struct sockaddr_in *)msgname;
 910                sinfrom = &asoc->peer.primary_addr.v4;
 911                sin->sin_port = htons(asoc->peer.port);
 912                sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 913        }
 914}
 915
 916/* Initialize and copy out a msgname from an inbound skb. */
 917static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 918{
 919        if (msgname) {
 920                struct sctphdr *sh = sctp_hdr(skb);
 921                struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 922
 923                sctp_inet_msgname(msgname, len);
 924                sin->sin_port = sh->source;
 925                sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 926        }
 927}
 928
 929/* Do we support this AF? */
 930static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 931{
 932        /* PF_INET only supports AF_INET addresses. */
 933        return AF_INET == family;
 934}
 935
 936/* Address matching with wildcards allowed. */
 937static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 938                              const union sctp_addr *addr2,
 939                              struct sctp_sock *opt)
 940{
 941        /* PF_INET only supports AF_INET addresses. */
 942        if (addr1->sa.sa_family != addr2->sa.sa_family)
 943                return 0;
 944        if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 945            htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 946                return 1;
 947        if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 948                return 1;
 949
 950        return 0;
 951}
 952
 953/* Verify that provided sockaddr looks bindable.  Common verification has
 954 * already been taken care of.
 955 */
 956static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 957{
 958        return sctp_v4_available(addr, opt);
 959}
 960
 961/* Verify that sockaddr looks sendable.  Common verification has already
 962 * been taken care of.
 963 */
 964static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 965{
 966        return 1;
 967}
 968
 969/* Fill in Supported Address Type information for INIT and INIT-ACK
 970 * chunks.  Returns number of addresses supported.
 971 */
 972static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 973                                     __be16 *types)
 974{
 975        types[0] = SCTP_PARAM_IPV4_ADDRESS;
 976        return 1;
 977}
 978
 979/* Wrapper routine that calls the ip transmit routine. */
 980static inline int sctp_v4_xmit(struct sk_buff *skb,
 981                               struct sctp_transport *transport)
 982{
 983        struct inet_sock *inet = inet_sk(skb->sk);
 984
 985        SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n",
 986                          __func__, skb, skb->len,
 987                          &transport->fl.u.ip4.saddr,
 988                          &transport->fl.u.ip4.daddr);
 989
 990        inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 991                         IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 992
 993        SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
 994        return ip_queue_xmit(skb, &transport->fl);
 995}
 996
 997static struct sctp_af sctp_af_inet;
 998
 999static struct sctp_pf sctp_pf_inet = {
1000        .event_msgname = sctp_inet_event_msgname,
1001        .skb_msgname   = sctp_inet_skb_msgname,
1002        .af_supported  = sctp_inet_af_supported,
1003        .cmp_addr      = sctp_inet_cmp_addr,
1004        .bind_verify   = sctp_inet_bind_verify,
1005        .send_verify   = sctp_inet_send_verify,
1006        .supported_addrs = sctp_inet_supported_addrs,
1007        .create_accept_sk = sctp_v4_create_accept_sk,
1008        .addr_v4map     = sctp_v4_addr_v4map,
1009        .af            = &sctp_af_inet
1010};
1011
1012/* Notifier for inetaddr addition/deletion events.  */
1013static struct notifier_block sctp_inetaddr_notifier = {
1014        .notifier_call = sctp_inetaddr_event,
1015};
1016
1017/* Socket operations.  */
1018static const struct proto_ops inet_seqpacket_ops = {
1019        .family            = PF_INET,
1020        .owner             = THIS_MODULE,
1021        .release           = inet_release,      /* Needs to be wrapped... */
1022        .bind              = inet_bind,
1023        .connect           = inet_dgram_connect,
1024        .socketpair        = sock_no_socketpair,
1025        .accept            = inet_accept,
1026        .getname           = inet_getname,      /* Semantics are different.  */
1027        .poll              = sctp_poll,
1028        .ioctl             = inet_ioctl,
1029        .listen            = sctp_inet_listen,
1030        .shutdown          = inet_shutdown,     /* Looks harmless.  */
1031        .setsockopt        = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1032        .getsockopt        = sock_common_getsockopt,
1033        .sendmsg           = inet_sendmsg,
1034        .recvmsg           = sock_common_recvmsg,
1035        .mmap              = sock_no_mmap,
1036        .sendpage          = sock_no_sendpage,
1037#ifdef CONFIG_COMPAT
1038        .compat_setsockopt = compat_sock_common_setsockopt,
1039        .compat_getsockopt = compat_sock_common_getsockopt,
1040#endif
1041};
1042
1043/* Registration with AF_INET family.  */
1044static struct inet_protosw sctp_seqpacket_protosw = {
1045        .type       = SOCK_SEQPACKET,
1046        .protocol   = IPPROTO_SCTP,
1047        .prot       = &sctp_prot,
1048        .ops        = &inet_seqpacket_ops,
1049        .no_check   = 0,
1050        .flags      = SCTP_PROTOSW_FLAG
1051};
1052static struct inet_protosw sctp_stream_protosw = {
1053        .type       = SOCK_STREAM,
1054        .protocol   = IPPROTO_SCTP,
1055        .prot       = &sctp_prot,
1056        .ops        = &inet_seqpacket_ops,
1057        .no_check   = 0,
1058        .flags      = SCTP_PROTOSW_FLAG
1059};
1060
1061/* Register with IP layer.  */
1062static const struct net_protocol sctp_protocol = {
1063        .handler     = sctp_rcv,
1064        .err_handler = sctp_v4_err,
1065        .no_policy   = 1,
1066};
1067
1068/* IPv4 address related functions.  */
1069static struct sctp_af sctp_af_inet = {
1070        .sa_family         = AF_INET,
1071        .sctp_xmit         = sctp_v4_xmit,
1072        .setsockopt        = ip_setsockopt,
1073        .getsockopt        = ip_getsockopt,
1074        .get_dst           = sctp_v4_get_dst,
1075        .get_saddr         = sctp_v4_get_saddr,
1076        .copy_addrlist     = sctp_v4_copy_addrlist,
1077        .from_skb          = sctp_v4_from_skb,
1078        .from_sk           = sctp_v4_from_sk,
1079        .to_sk_saddr       = sctp_v4_to_sk_saddr,
1080        .to_sk_daddr       = sctp_v4_to_sk_daddr,
1081        .from_addr_param   = sctp_v4_from_addr_param,
1082        .to_addr_param     = sctp_v4_to_addr_param,
1083        .cmp_addr          = sctp_v4_cmp_addr,
1084        .addr_valid        = sctp_v4_addr_valid,
1085        .inaddr_any        = sctp_v4_inaddr_any,
1086        .is_any            = sctp_v4_is_any,
1087        .available         = sctp_v4_available,
1088        .scope             = sctp_v4_scope,
1089        .skb_iif           = sctp_v4_skb_iif,
1090        .is_ce             = sctp_v4_is_ce,
1091        .seq_dump_addr     = sctp_v4_seq_dump_addr,
1092        .ecn_capable       = sctp_v4_ecn_capable,
1093        .net_header_len    = sizeof(struct iphdr),
1094        .sockaddr_len      = sizeof(struct sockaddr_in),
1095#ifdef CONFIG_COMPAT
1096        .compat_setsockopt = compat_ip_setsockopt,
1097        .compat_getsockopt = compat_ip_getsockopt,
1098#endif
1099};
1100
1101struct sctp_pf *sctp_get_pf_specific(sa_family_t family) {
1102
1103        switch (family) {
1104        case PF_INET:
1105                return sctp_pf_inet_specific;
1106        case PF_INET6:
1107                return sctp_pf_inet6_specific;
1108        default:
1109                return NULL;
1110        }
1111}
1112
1113/* Register the PF specific function table.  */
1114int sctp_register_pf(struct sctp_pf *pf, sa_family_t family)
1115{
1116        switch (family) {
1117        case PF_INET:
1118                if (sctp_pf_inet_specific)
1119                        return 0;
1120                sctp_pf_inet_specific = pf;
1121                break;
1122        case PF_INET6:
1123                if (sctp_pf_inet6_specific)
1124                        return 0;
1125                sctp_pf_inet6_specific = pf;
1126                break;
1127        default:
1128                return 0;
1129        }
1130        return 1;
1131}
1132
1133static inline int init_sctp_mibs(void)
1134{
1135        return snmp_mib_init((void __percpu **)sctp_statistics,
1136                             sizeof(struct sctp_mib),
1137                             __alignof__(struct sctp_mib));
1138}
1139
1140static inline void cleanup_sctp_mibs(void)
1141{
1142        snmp_mib_free((void __percpu **)sctp_statistics);
1143}
1144
1145static void sctp_v4_pf_init(void)
1146{
1147        /* Initialize the SCTP specific PF functions. */
1148        sctp_register_pf(&sctp_pf_inet, PF_INET);
1149        sctp_register_af(&sctp_af_inet);
1150}
1151
1152static void sctp_v4_pf_exit(void)
1153{
1154        list_del(&sctp_af_inet.list);
1155}
1156
1157static int sctp_v4_protosw_init(void)
1158{
1159        int rc;
1160
1161        rc = proto_register(&sctp_prot, 1);
1162        if (rc)
1163                return rc;
1164
1165        /* Register SCTP(UDP and TCP style) with socket layer.  */
1166        inet_register_protosw(&sctp_seqpacket_protosw);
1167        inet_register_protosw(&sctp_stream_protosw);
1168
1169        return 0;
1170}
1171
1172static void sctp_v4_protosw_exit(void)
1173{
1174        inet_unregister_protosw(&sctp_stream_protosw);
1175        inet_unregister_protosw(&sctp_seqpacket_protosw);
1176        proto_unregister(&sctp_prot);
1177}
1178
1179static int sctp_v4_add_protocol(void)
1180{
1181        /* Register notifier for inet address additions/deletions. */
1182        register_inetaddr_notifier(&sctp_inetaddr_notifier);
1183
1184        /* Register SCTP with inet layer.  */
1185        if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1186                return -EAGAIN;
1187
1188        return 0;
1189}
1190
1191static void sctp_v4_del_protocol(void)
1192{
1193        inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1194        unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1195}
1196
1197/* Initialize the universe into something sensible.  */
1198SCTP_STATIC __init int sctp_init(void)
1199{
1200        int i;
1201        int status = -EINVAL;
1202        unsigned long goal;
1203        unsigned long limit;
1204        int max_share;
1205        int order;
1206
1207        /* SCTP_DEBUG sanity check. */
1208        if (!sctp_sanity_check())
1209                goto out;
1210
1211        /* Allocate bind_bucket and chunk caches. */
1212        status = -ENOBUFS;
1213        sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1214                                               sizeof(struct sctp_bind_bucket),
1215                                               0, SLAB_HWCACHE_ALIGN,
1216                                               NULL);
1217        if (!sctp_bucket_cachep)
1218                goto out;
1219
1220        sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1221                                               sizeof(struct sctp_chunk),
1222                                               0, SLAB_HWCACHE_ALIGN,
1223                                               NULL);
1224        if (!sctp_chunk_cachep)
1225                goto err_chunk_cachep;
1226
1227        /* Allocate and initialise sctp mibs.  */
1228        status = init_sctp_mibs();
1229        if (status)
1230                goto err_init_mibs;
1231
1232        /* Initialize proc fs directory.  */
1233        status = sctp_proc_init();
1234        if (status)
1235                goto err_init_proc;
1236
1237        /* Initialize object count debugging.  */
1238        sctp_dbg_objcnt_init();
1239
1240        /*
1241         * 14. Suggested SCTP Protocol Parameter Values
1242         */
1243        /* The following protocol parameters are RECOMMENDED:  */
1244        /* RTO.Initial              - 3  seconds */
1245        sctp_rto_initial                = SCTP_RTO_INITIAL;
1246        /* RTO.Min                  - 1  second */
1247        sctp_rto_min                    = SCTP_RTO_MIN;
1248        /* RTO.Max                 -  60 seconds */
1249        sctp_rto_max                    = SCTP_RTO_MAX;
1250        /* RTO.Alpha                - 1/8 */
1251        sctp_rto_alpha                  = SCTP_RTO_ALPHA;
1252        /* RTO.Beta                 - 1/4 */
1253        sctp_rto_beta                   = SCTP_RTO_BETA;
1254
1255        /* Valid.Cookie.Life        - 60  seconds */
1256        sctp_valid_cookie_life          = SCTP_DEFAULT_COOKIE_LIFE;
1257
1258        /* Whether Cookie Preservative is enabled(1) or not(0) */
1259        sctp_cookie_preserve_enable     = 1;
1260
1261        /* Max.Burst                - 4 */
1262        sctp_max_burst                  = SCTP_DEFAULT_MAX_BURST;
1263
1264        /* Association.Max.Retrans  - 10 attempts
1265         * Path.Max.Retrans         - 5  attempts (per destination address)
1266         * Max.Init.Retransmits     - 8  attempts
1267         */
1268        sctp_max_retrans_association    = 10;
1269        sctp_max_retrans_path           = 5;
1270        sctp_max_retrans_init           = 8;
1271
1272        /* Sendbuffer growth        - do per-socket accounting */
1273        sctp_sndbuf_policy              = 0;
1274
1275        /* Rcvbuffer growth         - do per-socket accounting */
1276        sctp_rcvbuf_policy              = 0;
1277
1278        /* HB.interval              - 30 seconds */
1279        sctp_hb_interval                = SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1280
1281        /* delayed SACK timeout */
1282        sctp_sack_timeout               = SCTP_DEFAULT_TIMEOUT_SACK;
1283
1284        /* Implementation specific variables. */
1285
1286        /* Initialize default stream count setup information. */
1287        sctp_max_instreams              = SCTP_DEFAULT_INSTREAMS;
1288        sctp_max_outstreams             = SCTP_DEFAULT_OUTSTREAMS;
1289
1290        /* Initialize maximum autoclose timeout. */
1291        sctp_max_autoclose              = INT_MAX / HZ;
1292
1293        /* Initialize handle used for association ids. */
1294        idr_init(&sctp_assocs_id);
1295
1296        limit = nr_free_buffer_pages() / 8;
1297        limit = max(limit, 128UL);
1298        sysctl_sctp_mem[0] = limit / 4 * 3;
1299        sysctl_sctp_mem[1] = limit;
1300        sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1301
1302        /* Set per-socket limits to no more than 1/128 the pressure threshold*/
1303        limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1304        max_share = min(4UL*1024*1024, limit);
1305
1306        sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1307        sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1308        sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1309
1310        sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1311        sysctl_sctp_wmem[1] = 16*1024;
1312        sysctl_sctp_wmem[2] = max(64*1024, max_share);
1313
1314        /* Size and allocate the association hash table.
1315         * The methodology is similar to that of the tcp hash tables.
1316         */
1317        if (totalram_pages >= (128 * 1024))
1318                goal = totalram_pages >> (22 - PAGE_SHIFT);
1319        else
1320                goal = totalram_pages >> (24 - PAGE_SHIFT);
1321
1322        for (order = 0; (1UL << order) < goal; order++)
1323                ;
1324
1325        do {
1326                sctp_assoc_hashsize = (1UL << order) * PAGE_SIZE /
1327                                        sizeof(struct sctp_hashbucket);
1328                if ((sctp_assoc_hashsize > (64 * 1024)) && order > 0)
1329                        continue;
1330                sctp_assoc_hashtable = (struct sctp_hashbucket *)
1331                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1332        } while (!sctp_assoc_hashtable && --order > 0);
1333        if (!sctp_assoc_hashtable) {
1334                pr_err("Failed association hash alloc\n");
1335                status = -ENOMEM;
1336                goto err_ahash_alloc;
1337        }
1338        for (i = 0; i < sctp_assoc_hashsize; i++) {
1339                rwlock_init(&sctp_assoc_hashtable[i].lock);
1340                INIT_HLIST_HEAD(&sctp_assoc_hashtable[i].chain);
1341        }
1342
1343        /* Allocate and initialize the endpoint hash table.  */
1344        sctp_ep_hashsize = 64;
1345        sctp_ep_hashtable = (struct sctp_hashbucket *)
1346                kmalloc(64 * sizeof(struct sctp_hashbucket), GFP_KERNEL);
1347        if (!sctp_ep_hashtable) {
1348                pr_err("Failed endpoint_hash alloc\n");
1349                status = -ENOMEM;
1350                goto err_ehash_alloc;
1351        }
1352        for (i = 0; i < sctp_ep_hashsize; i++) {
1353                rwlock_init(&sctp_ep_hashtable[i].lock);
1354                INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1355        }
1356
1357        /* Allocate and initialize the SCTP port hash table.  */
1358        do {
1359                sctp_port_hashsize = (1UL << order) * PAGE_SIZE /
1360                                        sizeof(struct sctp_bind_hashbucket);
1361                if ((sctp_port_hashsize > (64 * 1024)) && order > 0)
1362                        continue;
1363                sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1364                        __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, order);
1365        } while (!sctp_port_hashtable && --order > 0);
1366        if (!sctp_port_hashtable) {
1367                pr_err("Failed bind hash alloc\n");
1368                status = -ENOMEM;
1369                goto err_bhash_alloc;
1370        }
1371        for (i = 0; i < sctp_port_hashsize; i++) {
1372                spin_lock_init(&sctp_port_hashtable[i].lock);
1373                INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1374        }
1375
1376        pr_info("Hash tables configured (established %d bind %d)\n",
1377                sctp_assoc_hashsize, sctp_port_hashsize);
1378
1379        /* Disable ADDIP by default. */
1380        sctp_addip_enable = 0;
1381        sctp_addip_noauth = 0;
1382        sctp_default_auto_asconf = 0;
1383
1384        /* Enable PR-SCTP by default. */
1385        sctp_prsctp_enable = 1;
1386
1387        /* Disable AUTH by default. */
1388        sctp_auth_enable = 0;
1389
1390        /* Set SCOPE policy to enabled */
1391        sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1392
1393        /* Set the default rwnd update threshold */
1394        sctp_rwnd_upd_shift             = SCTP_DEFAULT_RWND_SHIFT;
1395
1396        sctp_sysctl_register();
1397
1398        INIT_LIST_HEAD(&sctp_address_families);
1399        sctp_v4_pf_init();
1400        sctp_v6_pf_init();
1401
1402        /* Initialize the local address list. */
1403        INIT_LIST_HEAD(&sctp_local_addr_list);
1404        spin_lock_init(&sctp_local_addr_lock);
1405        sctp_get_local_addr_list();
1406
1407        /* Initialize the address event list */
1408        INIT_LIST_HEAD(&sctp_addr_waitq);
1409        INIT_LIST_HEAD(&sctp_auto_asconf_splist);
1410        spin_lock_init(&sctp_addr_wq_lock);
1411        sctp_addr_wq_timer.expires = 0;
1412        setup_timer(&sctp_addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1413
1414        status = sctp_v4_protosw_init();
1415
1416        if (status)
1417                goto err_protosw_init;
1418
1419        status = sctp_v6_protosw_init();
1420        if (status)
1421                goto err_v6_protosw_init;
1422
1423        /* Initialize the control inode/socket for handling OOTB packets.  */
1424        if ((status = sctp_ctl_sock_init())) {
1425                pr_err("Failed to initialize the SCTP control sock\n");
1426                goto err_ctl_sock_init;
1427        }
1428
1429        status = sctp_v4_add_protocol();
1430        if (status)
1431                goto err_add_protocol;
1432
1433        /* Register SCTP with inet6 layer.  */
1434        status = sctp_v6_add_protocol();
1435        if (status)
1436                goto err_v6_add_protocol;
1437
1438        status = 0;
1439out:
1440        return status;
1441err_v6_add_protocol:
1442        sctp_v4_del_protocol();
1443err_add_protocol:
1444        inet_ctl_sock_destroy(sctp_ctl_sock);
1445err_ctl_sock_init:
1446        sctp_v6_protosw_exit();
1447err_v6_protosw_init:
1448        sctp_v4_protosw_exit();
1449err_protosw_init:
1450        sctp_free_local_addr_list();
1451        sctp_v4_pf_exit();
1452        sctp_v6_pf_exit();
1453        sctp_sysctl_unregister();
1454        free_pages((unsigned long)sctp_port_hashtable,
1455                   get_order(sctp_port_hashsize *
1456                             sizeof(struct sctp_bind_hashbucket)));
1457err_bhash_alloc:
1458        kfree(sctp_ep_hashtable);
1459err_ehash_alloc:
1460        free_pages((unsigned long)sctp_assoc_hashtable,
1461                   get_order(sctp_assoc_hashsize *
1462                             sizeof(struct sctp_hashbucket)));
1463err_ahash_alloc:
1464        sctp_dbg_objcnt_exit();
1465        sctp_proc_exit();
1466err_init_proc:
1467        cleanup_sctp_mibs();
1468err_init_mibs:
1469        kmem_cache_destroy(sctp_chunk_cachep);
1470err_chunk_cachep:
1471        kmem_cache_destroy(sctp_bucket_cachep);
1472        goto out;
1473}
1474
1475/* Exit handler for the SCTP protocol.  */
1476SCTP_STATIC __exit void sctp_exit(void)
1477{
1478        /* BUG.  This should probably do something useful like clean
1479         * up all the remaining associations and all that memory.
1480         */
1481
1482        /* Unregister with inet6/inet layers. */
1483        sctp_v6_del_protocol();
1484        sctp_v4_del_protocol();
1485        sctp_free_addr_wq();
1486
1487        /* Free the control endpoint.  */
1488        inet_ctl_sock_destroy(sctp_ctl_sock);
1489
1490        /* Free protosw registrations */
1491        sctp_v6_protosw_exit();
1492        sctp_v4_protosw_exit();
1493
1494        /* Free the local address list.  */
1495        sctp_free_local_addr_list();
1496
1497        /* Unregister with socket layer. */
1498        sctp_v6_pf_exit();
1499        sctp_v4_pf_exit();
1500
1501        sctp_sysctl_unregister();
1502
1503        free_pages((unsigned long)sctp_assoc_hashtable,
1504                   get_order(sctp_assoc_hashsize *
1505                             sizeof(struct sctp_hashbucket)));
1506        kfree(sctp_ep_hashtable);
1507        free_pages((unsigned long)sctp_port_hashtable,
1508                   get_order(sctp_port_hashsize *
1509                             sizeof(struct sctp_bind_hashbucket)));
1510
1511        sctp_dbg_objcnt_exit();
1512        sctp_proc_exit();
1513        cleanup_sctp_mibs();
1514
1515        rcu_barrier(); /* Wait for completion of call_rcu()'s */
1516
1517        kmem_cache_destroy(sctp_chunk_cachep);
1518        kmem_cache_destroy(sctp_bucket_cachep);
1519}
1520
1521module_init(sctp_init);
1522module_exit(sctp_exit);
1523
1524/*
1525 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1526 */
1527MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1528MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1529MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1530MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1531module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1532MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1533MODULE_LICENSE("GPL");
1534
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