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 skb_rtable(skb)->rt_iif;
 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 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		}
 
 676free_next:
 
 677		list_del(&addrw->list);
 678		kfree(addrw);
 679	}
 680	spin_unlock_bh(&sctp_addr_wq_lock);
 681}
 682
 683static 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 */
 700static 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
 720void 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 */
 771static 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 */
 823static 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. */
 848int 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 */
 873struct 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. */
 886static 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. */
 897static 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. */
 915static 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? */
 928static 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. */
 935static 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 */
 954static 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 */
 962static 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 */
 970static 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. */
 978static 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
 995static struct sctp_af sctp_af_inet;
 996
 997static 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.  */
1011static struct notifier_block sctp_inetaddr_notifier = {
1012	.notifier_call = sctp_inetaddr_event,
1013};
1014
1015/* Socket operations.  */
1016static 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.  */
1042static 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};
1050static 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.  */
1060static 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.  */
1067static 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
1099struct 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.  */
1112int 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
1131static 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
1138static inline void cleanup_sctp_mibs(void)
1139{
1140	snmp_mib_free((void __percpu **)sctp_statistics);
1141}
1142
1143static 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
1150static void sctp_v4_pf_exit(void)
1151{
1152	list_del(&sctp_af_inet.list);
1153}
1154
1155static 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
1170static 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
1177static 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
1189static 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.  */
1196SCTP_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 *(sizeof(struct sk_buff) + 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;
1434out:
1435	return status;
1436err_v6_add_protocol:
1437	sctp_v4_del_protocol();
1438err_add_protocol:
1439	inet_ctl_sock_destroy(sctp_ctl_sock);
1440err_ctl_sock_init:
1441	sctp_v6_protosw_exit();
1442err_v6_protosw_init:
1443	sctp_v4_protosw_exit();
1444err_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)));
1452err_bhash_alloc:
1453	kfree(sctp_ep_hashtable);
1454err_ehash_alloc:
1455	free_pages((unsigned long)sctp_assoc_hashtable,
1456		   get_order(sctp_assoc_hashsize *
1457			     sizeof(struct sctp_hashbucket)));
1458err_ahash_alloc:
1459	sctp_dbg_objcnt_exit();
1460	sctp_proc_exit();
1461err_init_proc:
1462	cleanup_sctp_mibs();
1463err_init_mibs:
1464	kmem_cache_destroy(sctp_chunk_cachep);
1465err_chunk_cachep:
1466	kmem_cache_destroy(sctp_bucket_cachep);
1467	goto out;
1468}
1469
1470/* Exit handler for the SCTP protocol.  */
1471SCTP_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
1516module_init(sctp_init);
1517module_exit(sctp_exit);
1518
1519/*
1520 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1521 */
1522MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1523MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1524MODULE_AUTHOR("Linux Kernel SCTP developers <lksctp-developers@lists.sourceforge.net>");
1525MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1526module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1527MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1528MODULE_LICENSE("GPL");