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/net/sctp/protocol.c

http://github.com/mirrors/linux
C | 1630 lines | 1141 code | 244 blank | 245 comment | 146 complexity | 1fbb44a1530c708b5d397933adaad4d6 MD5 | raw file
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* SCTP kernel implementation
   3 * (C) Copyright IBM Corp. 2001, 2004
   4 * Copyright (c) 1999-2000 Cisco, Inc.
   5 * Copyright (c) 1999-2001 Motorola, Inc.
   6 * Copyright (c) 2001 Intel Corp.
   7 * Copyright (c) 2001 Nokia, Inc.
   8 * Copyright (c) 2001 La Monte H.P. Yarroll
   9 *
  10 * This file is part of the SCTP kernel implementation
  11 *
  12 * Initialization/cleanup for SCTP protocol support.
  13 *
  14 * Please send any bug reports or fixes you make to the
  15 * email address(es):
  16 *    lksctp developers <linux-sctp@vger.kernel.org>
  17 *
  18 * Written or modified by:
  19 *    La Monte H.P. Yarroll <piggy@acm.org>
  20 *    Karl Knutson <karl@athena.chicago.il.us>
  21 *    Jon Grimm <jgrimm@us.ibm.com>
  22 *    Sridhar Samudrala <sri@us.ibm.com>
  23 *    Daisy Chang <daisyc@us.ibm.com>
  24 *    Ardelle Fan <ardelle.fan@intel.com>
  25 */
  26
  27#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  28
  29#include <linux/module.h>
  30#include <linux/init.h>
  31#include <linux/netdevice.h>
  32#include <linux/inetdevice.h>
  33#include <linux/seq_file.h>
  34#include <linux/memblock.h>
  35#include <linux/highmem.h>
  36#include <linux/swap.h>
  37#include <linux/slab.h>
  38#include <net/net_namespace.h>
  39#include <net/protocol.h>
  40#include <net/ip.h>
  41#include <net/ipv6.h>
  42#include <net/route.h>
  43#include <net/sctp/sctp.h>
  44#include <net/addrconf.h>
  45#include <net/inet_common.h>
  46#include <net/inet_ecn.h>
  47
  48#define MAX_SCTP_PORT_HASH_ENTRIES (64 * 1024)
  49
  50/* Global data structures. */
  51struct sctp_globals sctp_globals __read_mostly;
  52
  53struct idr sctp_assocs_id;
  54DEFINE_SPINLOCK(sctp_assocs_id_lock);
  55
  56static struct sctp_pf *sctp_pf_inet6_specific;
  57static struct sctp_pf *sctp_pf_inet_specific;
  58static struct sctp_af *sctp_af_v4_specific;
  59static struct sctp_af *sctp_af_v6_specific;
  60
  61struct kmem_cache *sctp_chunk_cachep __read_mostly;
  62struct kmem_cache *sctp_bucket_cachep __read_mostly;
  63
  64long sysctl_sctp_mem[3];
  65int sysctl_sctp_rmem[3];
  66int sysctl_sctp_wmem[3];
  67
  68/* Private helper to extract ipv4 address and stash them in
  69 * the protocol structure.
  70 */
  71static void sctp_v4_copy_addrlist(struct list_head *addrlist,
  72				  struct net_device *dev)
  73{
  74	struct in_device *in_dev;
  75	struct in_ifaddr *ifa;
  76	struct sctp_sockaddr_entry *addr;
  77
  78	rcu_read_lock();
  79	if ((in_dev = __in_dev_get_rcu(dev)) == NULL) {
  80		rcu_read_unlock();
  81		return;
  82	}
  83
  84	in_dev_for_each_ifa_rcu(ifa, in_dev) {
  85		/* Add the address to the local list.  */
  86		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
  87		if (addr) {
  88			addr->a.v4.sin_family = AF_INET;
  89			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
  90			addr->valid = 1;
  91			INIT_LIST_HEAD(&addr->list);
  92			list_add_tail(&addr->list, addrlist);
  93		}
  94	}
  95
  96	rcu_read_unlock();
  97}
  98
  99/* Extract our IP addresses from the system and stash them in the
 100 * protocol structure.
 101 */
 102static void sctp_get_local_addr_list(struct net *net)
 103{
 104	struct net_device *dev;
 105	struct list_head *pos;
 106	struct sctp_af *af;
 107
 108	rcu_read_lock();
 109	for_each_netdev_rcu(net, dev) {
 110		list_for_each(pos, &sctp_address_families) {
 111			af = list_entry(pos, struct sctp_af, list);
 112			af->copy_addrlist(&net->sctp.local_addr_list, dev);
 113		}
 114	}
 115	rcu_read_unlock();
 116}
 117
 118/* Free the existing local addresses.  */
 119static void sctp_free_local_addr_list(struct net *net)
 120{
 121	struct sctp_sockaddr_entry *addr;
 122	struct list_head *pos, *temp;
 123
 124	list_for_each_safe(pos, temp, &net->sctp.local_addr_list) {
 125		addr = list_entry(pos, struct sctp_sockaddr_entry, list);
 126		list_del(pos);
 127		kfree(addr);
 128	}
 129}
 130
 131/* Copy the local addresses which are valid for 'scope' into 'bp'.  */
 132int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
 133			      enum sctp_scope scope, gfp_t gfp, int copy_flags)
 134{
 135	struct sctp_sockaddr_entry *addr;
 136	union sctp_addr laddr;
 137	int error = 0;
 138
 139	rcu_read_lock();
 140	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
 141		if (!addr->valid)
 142			continue;
 143		if (!sctp_in_scope(net, &addr->a, scope))
 144			continue;
 145
 146		/* Now that the address is in scope, check to see if
 147		 * the address type is really supported by the local
 148		 * sock as well as the remote peer.
 149		 */
 150		if (addr->a.sa.sa_family == AF_INET &&
 151		    !(copy_flags & SCTP_ADDR4_PEERSUPP))
 152			continue;
 153		if (addr->a.sa.sa_family == AF_INET6 &&
 154		    (!(copy_flags & SCTP_ADDR6_ALLOWED) ||
 155		     !(copy_flags & SCTP_ADDR6_PEERSUPP)))
 156			continue;
 157
 158		laddr = addr->a;
 159		/* also works for setting ipv6 address port */
 160		laddr.v4.sin_port = htons(bp->port);
 161		if (sctp_bind_addr_state(bp, &laddr) != -1)
 162			continue;
 163
 164		error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),
 165					   SCTP_ADDR_SRC, GFP_ATOMIC);
 166		if (error)
 167			break;
 168	}
 169
 170	rcu_read_unlock();
 171	return error;
 172}
 173
 174/* Copy over any ip options */
 175static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
 176{
 177	struct inet_sock *newinet, *inet = inet_sk(sk);
 178	struct ip_options_rcu *inet_opt, *newopt = NULL;
 179
 180	newinet = inet_sk(newsk);
 181
 182	rcu_read_lock();
 183	inet_opt = rcu_dereference(inet->inet_opt);
 184	if (inet_opt) {
 185		newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
 186				      inet_opt->opt.optlen, GFP_ATOMIC);
 187		if (newopt)
 188			memcpy(newopt, inet_opt, sizeof(*inet_opt) +
 189			       inet_opt->opt.optlen);
 190		else
 191			pr_err("%s: Failed to copy ip options\n", __func__);
 192	}
 193	RCU_INIT_POINTER(newinet->inet_opt, newopt);
 194	rcu_read_unlock();
 195}
 196
 197/* Account for the IP options */
 198static int sctp_v4_ip_options_len(struct sock *sk)
 199{
 200	struct inet_sock *inet = inet_sk(sk);
 201	struct ip_options_rcu *inet_opt;
 202	int len = 0;
 203
 204	rcu_read_lock();
 205	inet_opt = rcu_dereference(inet->inet_opt);
 206	if (inet_opt)
 207		len = inet_opt->opt.optlen;
 208
 209	rcu_read_unlock();
 210	return len;
 211}
 212
 213/* Initialize a sctp_addr from in incoming skb.  */
 214static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 215			     int is_saddr)
 216{
 217	/* Always called on head skb, so this is safe */
 218	struct sctphdr *sh = sctp_hdr(skb);
 219	struct sockaddr_in *sa = &addr->v4;
 220
 221	addr->v4.sin_family = AF_INET;
 222
 223	if (is_saddr) {
 224		sa->sin_port = sh->source;
 225		sa->sin_addr.s_addr = ip_hdr(skb)->saddr;
 226	} else {
 227		sa->sin_port = sh->dest;
 228		sa->sin_addr.s_addr = ip_hdr(skb)->daddr;
 229	}
 230	memset(sa->sin_zero, 0, sizeof(sa->sin_zero));
 231}
 232
 233/* Initialize an sctp_addr from a socket. */
 234static void sctp_v4_from_sk(union sctp_addr *addr, struct sock *sk)
 235{
 236	addr->v4.sin_family = AF_INET;
 237	addr->v4.sin_port = 0;
 238	addr->v4.sin_addr.s_addr = inet_sk(sk)->inet_rcv_saddr;
 239	memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
 240}
 241
 242/* Initialize sk->sk_rcv_saddr from sctp_addr. */
 243static void sctp_v4_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
 244{
 245	inet_sk(sk)->inet_rcv_saddr = addr->v4.sin_addr.s_addr;
 246}
 247
 248/* Initialize sk->sk_daddr from sctp_addr. */
 249static void sctp_v4_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
 250{
 251	inet_sk(sk)->inet_daddr = addr->v4.sin_addr.s_addr;
 252}
 253
 254/* Initialize a sctp_addr from an address parameter. */
 255static void sctp_v4_from_addr_param(union sctp_addr *addr,
 256				    union sctp_addr_param *param,
 257				    __be16 port, int iif)
 258{
 259	addr->v4.sin_family = AF_INET;
 260	addr->v4.sin_port = port;
 261	addr->v4.sin_addr.s_addr = param->v4.addr.s_addr;
 262	memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
 263}
 264
 265/* Initialize an address parameter from a sctp_addr and return the length
 266 * of the address parameter.
 267 */
 268static int sctp_v4_to_addr_param(const union sctp_addr *addr,
 269				 union sctp_addr_param *param)
 270{
 271	int length = sizeof(struct sctp_ipv4addr_param);
 272
 273	param->v4.param_hdr.type = SCTP_PARAM_IPV4_ADDRESS;
 274	param->v4.param_hdr.length = htons(length);
 275	param->v4.addr.s_addr = addr->v4.sin_addr.s_addr;
 276
 277	return length;
 278}
 279
 280/* Initialize a sctp_addr from a dst_entry. */
 281static void sctp_v4_dst_saddr(union sctp_addr *saddr, struct flowi4 *fl4,
 282			      __be16 port)
 283{
 284	saddr->v4.sin_family = AF_INET;
 285	saddr->v4.sin_port = port;
 286	saddr->v4.sin_addr.s_addr = fl4->saddr;
 287	memset(saddr->v4.sin_zero, 0, sizeof(saddr->v4.sin_zero));
 288}
 289
 290/* Compare two addresses exactly. */
 291static int sctp_v4_cmp_addr(const union sctp_addr *addr1,
 292			    const union sctp_addr *addr2)
 293{
 294	if (addr1->sa.sa_family != addr2->sa.sa_family)
 295		return 0;
 296	if (addr1->v4.sin_port != addr2->v4.sin_port)
 297		return 0;
 298	if (addr1->v4.sin_addr.s_addr != addr2->v4.sin_addr.s_addr)
 299		return 0;
 300
 301	return 1;
 302}
 303
 304/* Initialize addr struct to INADDR_ANY. */
 305static void sctp_v4_inaddr_any(union sctp_addr *addr, __be16 port)
 306{
 307	addr->v4.sin_family = AF_INET;
 308	addr->v4.sin_addr.s_addr = htonl(INADDR_ANY);
 309	addr->v4.sin_port = port;
 310	memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
 311}
 312
 313/* Is this a wildcard address? */
 314static int sctp_v4_is_any(const union sctp_addr *addr)
 315{
 316	return htonl(INADDR_ANY) == addr->v4.sin_addr.s_addr;
 317}
 318
 319/* This function checks if the address is a valid address to be used for
 320 * SCTP binding.
 321 *
 322 * Output:
 323 * Return 0 - If the address is a non-unicast or an illegal address.
 324 * Return 1 - If the address is a unicast.
 325 */
 326static int sctp_v4_addr_valid(union sctp_addr *addr,
 327			      struct sctp_sock *sp,
 328			      const struct sk_buff *skb)
 329{
 330	/* IPv4 addresses not allowed */
 331	if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
 332		return 0;
 333
 334	/* Is this a non-unicast address or a unusable SCTP address? */
 335	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr))
 336		return 0;
 337
 338	/* Is this a broadcast address? */
 339	if (skb && skb_rtable(skb)->rt_flags & RTCF_BROADCAST)
 340		return 0;
 341
 342	return 1;
 343}
 344
 345/* Should this be available for binding?   */
 346static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
 347{
 348	struct net *net = sock_net(&sp->inet.sk);
 349	int ret = inet_addr_type(net, addr->v4.sin_addr.s_addr);
 350
 351
 352	if (addr->v4.sin_addr.s_addr != htonl(INADDR_ANY) &&
 353	   ret != RTN_LOCAL &&
 354	   !sp->inet.freebind &&
 355	   !net->ipv4.sysctl_ip_nonlocal_bind)
 356		return 0;
 357
 358	if (ipv6_only_sock(sctp_opt2sk(sp)))
 359		return 0;
 360
 361	return 1;
 362}
 363
 364/* Checking the loopback, private and other address scopes as defined in
 365 * RFC 1918.   The IPv4 scoping is based on the draft for SCTP IPv4
 366 * scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
 367 *
 368 * Level 0 - unusable SCTP addresses
 369 * Level 1 - loopback address
 370 * Level 2 - link-local addresses
 371 * Level 3 - private addresses.
 372 * Level 4 - global addresses
 373 * For INIT and INIT-ACK address list, let L be the level of
 374 * of requested destination address, sender and receiver
 375 * SHOULD include all of its addresses with level greater
 376 * than or equal to L.
 377 *
 378 * IPv4 scoping can be controlled through sysctl option
 379 * net.sctp.addr_scope_policy
 380 */
 381static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
 382{
 383	enum sctp_scope retval;
 384
 385	/* Check for unusable SCTP addresses. */
 386	if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
 387		retval =  SCTP_SCOPE_UNUSABLE;
 388	} else if (ipv4_is_loopback(addr->v4.sin_addr.s_addr)) {
 389		retval = SCTP_SCOPE_LOOPBACK;
 390	} else if (ipv4_is_linklocal_169(addr->v4.sin_addr.s_addr)) {
 391		retval = SCTP_SCOPE_LINK;
 392	} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
 393		   ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
 394		   ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
 395		retval = SCTP_SCOPE_PRIVATE;
 396	} else {
 397		retval = SCTP_SCOPE_GLOBAL;
 398	}
 399
 400	return retval;
 401}
 402
 403/* Returns a valid dst cache entry for the given source and destination ip
 404 * addresses. If an association is passed, trys to get a dst entry with a
 405 * source address that matches an address in the bind address list.
 406 */
 407static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 408				struct flowi *fl, struct sock *sk)
 409{
 410	struct sctp_association *asoc = t->asoc;
 411	struct rtable *rt;
 412	struct flowi _fl;
 413	struct flowi4 *fl4 = &_fl.u.ip4;
 414	struct sctp_bind_addr *bp;
 415	struct sctp_sockaddr_entry *laddr;
 416	struct dst_entry *dst = NULL;
 417	union sctp_addr *daddr = &t->ipaddr;
 418	union sctp_addr dst_saddr;
 419	__u8 tos = inet_sk(sk)->tos;
 420
 421	if (t->dscp & SCTP_DSCP_SET_MASK)
 422		tos = t->dscp & SCTP_DSCP_VAL_MASK;
 423	memset(&_fl, 0x0, sizeof(_fl));
 424	fl4->daddr  = daddr->v4.sin_addr.s_addr;
 425	fl4->fl4_dport = daddr->v4.sin_port;
 426	fl4->flowi4_proto = IPPROTO_SCTP;
 427	if (asoc) {
 428		fl4->flowi4_tos = RT_CONN_FLAGS_TOS(asoc->base.sk, tos);
 429		fl4->flowi4_oif = asoc->base.sk->sk_bound_dev_if;
 430		fl4->fl4_sport = htons(asoc->base.bind_addr.port);
 431	}
 432	if (saddr) {
 433		fl4->saddr = saddr->v4.sin_addr.s_addr;
 434		if (!fl4->fl4_sport)
 435			fl4->fl4_sport = saddr->v4.sin_port;
 436	}
 437
 438	pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
 439		 &fl4->saddr);
 440
 441	rt = ip_route_output_key(sock_net(sk), fl4);
 442	if (!IS_ERR(rt)) {
 443		dst = &rt->dst;
 444		t->dst = dst;
 445		memcpy(fl, &_fl, sizeof(_fl));
 446	}
 447
 448	/* If there is no association or if a source address is passed, no
 449	 * more validation is required.
 450	 */
 451	if (!asoc || saddr)
 452		goto out;
 453
 454	bp = &asoc->base.bind_addr;
 455
 456	if (dst) {
 457		/* Walk through the bind address list and look for a bind
 458		 * address that matches the source address of the returned dst.
 459		 */
 460		sctp_v4_dst_saddr(&dst_saddr, fl4, htons(bp->port));
 461		rcu_read_lock();
 462		list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 463			if (!laddr->valid || (laddr->state == SCTP_ADDR_DEL) ||
 464			    (laddr->state != SCTP_ADDR_SRC &&
 465			    !asoc->src_out_of_asoc_ok))
 466				continue;
 467			if (sctp_v4_cmp_addr(&dst_saddr, &laddr->a))
 468				goto out_unlock;
 469		}
 470		rcu_read_unlock();
 471
 472		/* None of the bound addresses match the source address of the
 473		 * dst. So release it.
 474		 */
 475		dst_release(dst);
 476		dst = NULL;
 477	}
 478
 479	/* Walk through the bind address list and try to get a dst that
 480	 * matches a bind address as the source address.
 481	 */
 482	rcu_read_lock();
 483	list_for_each_entry_rcu(laddr, &bp->address_list, list) {
 484		struct net_device *odev;
 485
 486		if (!laddr->valid)
 487			continue;
 488		if (laddr->state != SCTP_ADDR_SRC ||
 489		    AF_INET != laddr->a.sa.sa_family)
 490			continue;
 491
 492		fl4->fl4_sport = laddr->a.v4.sin_port;
 493		flowi4_update_output(fl4,
 494				     asoc->base.sk->sk_bound_dev_if,
 495				     RT_CONN_FLAGS_TOS(asoc->base.sk, tos),
 496				     daddr->v4.sin_addr.s_addr,
 497				     laddr->a.v4.sin_addr.s_addr);
 498
 499		rt = ip_route_output_key(sock_net(sk), fl4);
 500		if (IS_ERR(rt))
 501			continue;
 502
 503		/* Ensure the src address belongs to the output
 504		 * interface.
 505		 */
 506		odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
 507				     false);
 508		if (!odev || odev->ifindex != fl4->flowi4_oif) {
 509			if (!dst) {
 510				dst = &rt->dst;
 511				t->dst = dst;
 512				memcpy(fl, &_fl, sizeof(_fl));
 513			} else {
 514				dst_release(&rt->dst);
 515			}
 516			continue;
 517		}
 518
 519		dst_release(dst);
 520		dst = &rt->dst;
 521		t->dst = dst;
 522		memcpy(fl, &_fl, sizeof(_fl));
 523		break;
 524	}
 525
 526out_unlock:
 527	rcu_read_unlock();
 528out:
 529	if (dst) {
 530		pr_debug("rt_dst:%pI4, rt_src:%pI4\n",
 531			 &fl->u.ip4.daddr, &fl->u.ip4.saddr);
 532	} else {
 533		t->dst = NULL;
 534		pr_debug("no route\n");
 535	}
 536}
 537
 538/* For v4, the source address is cached in the route entry(dst). So no need
 539 * to cache it separately and hence this is an empty routine.
 540 */
 541static void sctp_v4_get_saddr(struct sctp_sock *sk,
 542			      struct sctp_transport *t,
 543			      struct flowi *fl)
 544{
 545	union sctp_addr *saddr = &t->saddr;
 546	struct rtable *rt = (struct rtable *)t->dst;
 547
 548	if (rt) {
 549		saddr->v4.sin_family = AF_INET;
 550		saddr->v4.sin_addr.s_addr = fl->u.ip4.saddr;
 551	}
 552}
 553
 554/* What interface did this skb arrive on? */
 555static int sctp_v4_skb_iif(const struct sk_buff *skb)
 556{
 557	return inet_iif(skb);
 558}
 559
 560/* Was this packet marked by Explicit Congestion Notification? */
 561static int sctp_v4_is_ce(const struct sk_buff *skb)
 562{
 563	return INET_ECN_is_ce(ip_hdr(skb)->tos);
 564}
 565
 566/* Create and initialize a new sk for the socket returned by accept(). */
 567static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 568					     struct sctp_association *asoc,
 569					     bool kern)
 570{
 571	struct sock *newsk = sk_alloc(sock_net(sk), PF_INET, GFP_KERNEL,
 572			sk->sk_prot, kern);
 573	struct inet_sock *newinet;
 574
 575	if (!newsk)
 576		goto out;
 577
 578	sock_init_data(NULL, newsk);
 579
 580	sctp_copy_sock(newsk, sk, asoc);
 581	sock_reset_flag(newsk, SOCK_ZAPPED);
 582
 583	sctp_v4_copy_ip_options(sk, newsk);
 584
 585	newinet = inet_sk(newsk);
 586
 587	newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
 588
 589	sk_refcnt_debug_inc(newsk);
 590
 591	if (newsk->sk_prot->init(newsk)) {
 592		sk_common_release(newsk);
 593		newsk = NULL;
 594	}
 595
 596out:
 597	return newsk;
 598}
 599
 600static int sctp_v4_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
 601{
 602	/* No address mapping for V4 sockets */
 603	memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
 604	return sizeof(struct sockaddr_in);
 605}
 606
 607/* Dump the v4 addr to the seq file. */
 608static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
 609{
 610	seq_printf(seq, "%pI4 ", &addr->v4.sin_addr);
 611}
 612
 613static void sctp_v4_ecn_capable(struct sock *sk)
 614{
 615	INET_ECN_xmit(sk);
 616}
 617
 618static void sctp_addr_wq_timeout_handler(struct timer_list *t)
 619{
 620	struct net *net = from_timer(net, t, sctp.addr_wq_timer);
 621	struct sctp_sockaddr_entry *addrw, *temp;
 622	struct sctp_sock *sp;
 623
 624	spin_lock_bh(&net->sctp.addr_wq_lock);
 625
 626	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 627		pr_debug("%s: the first ent in wq:%p is addr:%pISc for cmd:%d at "
 628			 "entry:%p\n", __func__, &net->sctp.addr_waitq, &addrw->a.sa,
 629			 addrw->state, addrw);
 630
 631#if IS_ENABLED(CONFIG_IPV6)
 632		/* Now we send an ASCONF for each association */
 633		/* Note. we currently don't handle link local IPv6 addressees */
 634		if (addrw->a.sa.sa_family == AF_INET6) {
 635			struct in6_addr *in6;
 636
 637			if (ipv6_addr_type(&addrw->a.v6.sin6_addr) &
 638			    IPV6_ADDR_LINKLOCAL)
 639				goto free_next;
 640
 641			in6 = (struct in6_addr *)&addrw->a.v6.sin6_addr;
 642			if (ipv6_chk_addr(net, in6, NULL, 0) == 0 &&
 643			    addrw->state == SCTP_ADDR_NEW) {
 644				unsigned long timeo_val;
 645
 646				pr_debug("%s: this is on DAD, trying %d sec "
 647					 "later\n", __func__,
 648					 SCTP_ADDRESS_TICK_DELAY);
 649
 650				timeo_val = jiffies;
 651				timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 652				mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 653				break;
 654			}
 655		}
 656#endif
 657		list_for_each_entry(sp, &net->sctp.auto_asconf_splist, auto_asconf_list) {
 658			struct sock *sk;
 659
 660			sk = sctp_opt2sk(sp);
 661			/* ignore bound-specific endpoints */
 662			if (!sctp_is_ep_boundall(sk))
 663				continue;
 664			bh_lock_sock(sk);
 665			if (sctp_asconf_mgmt(sp, addrw) < 0)
 666				pr_debug("%s: sctp_asconf_mgmt failed\n", __func__);
 667			bh_unlock_sock(sk);
 668		}
 669#if IS_ENABLED(CONFIG_IPV6)
 670free_next:
 671#endif
 672		list_del(&addrw->list);
 673		kfree(addrw);
 674	}
 675	spin_unlock_bh(&net->sctp.addr_wq_lock);
 676}
 677
 678static void sctp_free_addr_wq(struct net *net)
 679{
 680	struct sctp_sockaddr_entry *addrw;
 681	struct sctp_sockaddr_entry *temp;
 682
 683	spin_lock_bh(&net->sctp.addr_wq_lock);
 684	del_timer(&net->sctp.addr_wq_timer);
 685	list_for_each_entry_safe(addrw, temp, &net->sctp.addr_waitq, list) {
 686		list_del(&addrw->list);
 687		kfree(addrw);
 688	}
 689	spin_unlock_bh(&net->sctp.addr_wq_lock);
 690}
 691
 692/* lookup the entry for the same address in the addr_waitq
 693 * sctp_addr_wq MUST be locked
 694 */
 695static struct sctp_sockaddr_entry *sctp_addr_wq_lookup(struct net *net,
 696					struct sctp_sockaddr_entry *addr)
 697{
 698	struct sctp_sockaddr_entry *addrw;
 699
 700	list_for_each_entry(addrw, &net->sctp.addr_waitq, list) {
 701		if (addrw->a.sa.sa_family != addr->a.sa.sa_family)
 702			continue;
 703		if (addrw->a.sa.sa_family == AF_INET) {
 704			if (addrw->a.v4.sin_addr.s_addr ==
 705			    addr->a.v4.sin_addr.s_addr)
 706				return addrw;
 707		} else if (addrw->a.sa.sa_family == AF_INET6) {
 708			if (ipv6_addr_equal(&addrw->a.v6.sin6_addr,
 709			    &addr->a.v6.sin6_addr))
 710				return addrw;
 711		}
 712	}
 713	return NULL;
 714}
 715
 716void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
 717{
 718	struct sctp_sockaddr_entry *addrw;
 719	unsigned long timeo_val;
 720
 721	/* first, we check if an opposite message already exist in the queue.
 722	 * If we found such message, it is removed.
 723	 * This operation is a bit stupid, but the DHCP client attaches the
 724	 * new address after a couple of addition and deletion of that address
 725	 */
 726
 727	spin_lock_bh(&net->sctp.addr_wq_lock);
 728	/* Offsets existing events in addr_wq */
 729	addrw = sctp_addr_wq_lookup(net, addr);
 730	if (addrw) {
 731		if (addrw->state != cmd) {
 732			pr_debug("%s: offsets existing entry for %d, addr:%pISc "
 733				 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
 734				 &net->sctp.addr_waitq);
 735
 736			list_del(&addrw->list);
 737			kfree(addrw);
 738		}
 739		spin_unlock_bh(&net->sctp.addr_wq_lock);
 740		return;
 741	}
 742
 743	/* OK, we have to add the new address to the wait queue */
 744	addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
 745	if (addrw == NULL) {
 746		spin_unlock_bh(&net->sctp.addr_wq_lock);
 747		return;
 748	}
 749	addrw->state = cmd;
 750	list_add_tail(&addrw->list, &net->sctp.addr_waitq);
 751
 752	pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
 753		 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);
 754
 755	if (!timer_pending(&net->sctp.addr_wq_timer)) {
 756		timeo_val = jiffies;
 757		timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
 758		mod_timer(&net->sctp.addr_wq_timer, timeo_val);
 759	}
 760	spin_unlock_bh(&net->sctp.addr_wq_lock);
 761}
 762
 763/* Event handler for inet address addition/deletion events.
 764 * The sctp_local_addr_list needs to be protocted by a spin lock since
 765 * multiple notifiers (say IPv4 and IPv6) may be running at the same
 766 * time and thus corrupt the list.
 767 * The reader side is protected with RCU.
 768 */
 769static int sctp_inetaddr_event(struct notifier_block *this, unsigned long ev,
 770			       void *ptr)
 771{
 772	struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
 773	struct sctp_sockaddr_entry *addr = NULL;
 774	struct sctp_sockaddr_entry *temp;
 775	struct net *net = dev_net(ifa->ifa_dev->dev);
 776	int found = 0;
 777
 778	switch (ev) {
 779	case NETDEV_UP:
 780		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
 781		if (addr) {
 782			addr->a.v4.sin_family = AF_INET;
 783			addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
 784			addr->valid = 1;
 785			spin_lock_bh(&net->sctp.local_addr_lock);
 786			list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
 787			sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
 788			spin_unlock_bh(&net->sctp.local_addr_lock);
 789		}
 790		break;
 791	case NETDEV_DOWN:
 792		spin_lock_bh(&net->sctp.local_addr_lock);
 793		list_for_each_entry_safe(addr, temp,
 794					&net->sctp.local_addr_list, list) {
 795			if (addr->a.sa.sa_family == AF_INET &&
 796					addr->a.v4.sin_addr.s_addr ==
 797					ifa->ifa_local) {
 798				sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
 799				found = 1;
 800				addr->valid = 0;
 801				list_del_rcu(&addr->list);
 802				break;
 803			}
 804		}
 805		spin_unlock_bh(&net->sctp.local_addr_lock);
 806		if (found)
 807			kfree_rcu(addr, rcu);
 808		break;
 809	}
 810
 811	return NOTIFY_DONE;
 812}
 813
 814/*
 815 * Initialize the control inode/socket with a control endpoint data
 816 * structure.  This endpoint is reserved exclusively for the OOTB processing.
 817 */
 818static int sctp_ctl_sock_init(struct net *net)
 819{
 820	int err;
 821	sa_family_t family = PF_INET;
 822
 823	if (sctp_get_pf_specific(PF_INET6))
 824		family = PF_INET6;
 825
 826	err = inet_ctl_sock_create(&net->sctp.ctl_sock, family,
 827				   SOCK_SEQPACKET, IPPROTO_SCTP, net);
 828
 829	/* If IPv6 socket could not be created, try the IPv4 socket */
 830	if (err < 0 && family == PF_INET6)
 831		err = inet_ctl_sock_create(&net->sctp.ctl_sock, AF_INET,
 832					   SOCK_SEQPACKET, IPPROTO_SCTP,
 833					   net);
 834
 835	if (err < 0) {
 836		pr_err("Failed to create the SCTP control socket\n");
 837		return err;
 838	}
 839	return 0;
 840}
 841
 842/* Register address family specific functions. */
 843int sctp_register_af(struct sctp_af *af)
 844{
 845	switch (af->sa_family) {
 846	case AF_INET:
 847		if (sctp_af_v4_specific)
 848			return 0;
 849		sctp_af_v4_specific = af;
 850		break;
 851	case AF_INET6:
 852		if (sctp_af_v6_specific)
 853			return 0;
 854		sctp_af_v6_specific = af;
 855		break;
 856	default:
 857		return 0;
 858	}
 859
 860	INIT_LIST_HEAD(&af->list);
 861	list_add_tail(&af->list, &sctp_address_families);
 862	return 1;
 863}
 864
 865/* Get the table of functions for manipulating a particular address
 866 * family.
 867 */
 868struct sctp_af *sctp_get_af_specific(sa_family_t family)
 869{
 870	switch (family) {
 871	case AF_INET:
 872		return sctp_af_v4_specific;
 873	case AF_INET6:
 874		return sctp_af_v6_specific;
 875	default:
 876		return NULL;
 877	}
 878}
 879
 880/* Common code to initialize a AF_INET msg_name. */
 881static void sctp_inet_msgname(char *msgname, int *addr_len)
 882{
 883	struct sockaddr_in *sin;
 884
 885	sin = (struct sockaddr_in *)msgname;
 886	*addr_len = sizeof(struct sockaddr_in);
 887	sin->sin_family = AF_INET;
 888	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 889}
 890
 891/* Copy the primary address of the peer primary address as the msg_name. */
 892static void sctp_inet_event_msgname(struct sctp_ulpevent *event, char *msgname,
 893				    int *addr_len)
 894{
 895	struct sockaddr_in *sin, *sinfrom;
 896
 897	if (msgname) {
 898		struct sctp_association *asoc;
 899
 900		asoc = event->asoc;
 901		sctp_inet_msgname(msgname, addr_len);
 902		sin = (struct sockaddr_in *)msgname;
 903		sinfrom = &asoc->peer.primary_addr.v4;
 904		sin->sin_port = htons(asoc->peer.port);
 905		sin->sin_addr.s_addr = sinfrom->sin_addr.s_addr;
 906	}
 907}
 908
 909/* Initialize and copy out a msgname from an inbound skb. */
 910static void sctp_inet_skb_msgname(struct sk_buff *skb, char *msgname, int *len)
 911{
 912	if (msgname) {
 913		struct sctphdr *sh = sctp_hdr(skb);
 914		struct sockaddr_in *sin = (struct sockaddr_in *)msgname;
 915
 916		sctp_inet_msgname(msgname, len);
 917		sin->sin_port = sh->source;
 918		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 919	}
 920}
 921
 922/* Do we support this AF? */
 923static int sctp_inet_af_supported(sa_family_t family, struct sctp_sock *sp)
 924{
 925	/* PF_INET only supports AF_INET addresses. */
 926	return AF_INET == family;
 927}
 928
 929/* Address matching with wildcards allowed. */
 930static int sctp_inet_cmp_addr(const union sctp_addr *addr1,
 931			      const union sctp_addr *addr2,
 932			      struct sctp_sock *opt)
 933{
 934	/* PF_INET only supports AF_INET addresses. */
 935	if (addr1->sa.sa_family != addr2->sa.sa_family)
 936		return 0;
 937	if (htonl(INADDR_ANY) == addr1->v4.sin_addr.s_addr ||
 938	    htonl(INADDR_ANY) == addr2->v4.sin_addr.s_addr)
 939		return 1;
 940	if (addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr)
 941		return 1;
 942
 943	return 0;
 944}
 945
 946/* Verify that provided sockaddr looks bindable.  Common verification has
 947 * already been taken care of.
 948 */
 949static int sctp_inet_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
 950{
 951	return sctp_v4_available(addr, opt);
 952}
 953
 954/* Verify that sockaddr looks sendable.  Common verification has already
 955 * been taken care of.
 956 */
 957static int sctp_inet_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
 958{
 959	return 1;
 960}
 961
 962/* Fill in Supported Address Type information for INIT and INIT-ACK
 963 * chunks.  Returns number of addresses supported.
 964 */
 965static int sctp_inet_supported_addrs(const struct sctp_sock *opt,
 966				     __be16 *types)
 967{
 968	types[0] = SCTP_PARAM_IPV4_ADDRESS;
 969	return 1;
 970}
 971
 972/* Wrapper routine that calls the ip transmit routine. */
 973static inline int sctp_v4_xmit(struct sk_buff *skb,
 974			       struct sctp_transport *transport)
 975{
 976	struct inet_sock *inet = inet_sk(skb->sk);
 977	__u8 dscp = inet->tos;
 978
 979	pr_debug("%s: skb:%p, len:%d, src:%pI4, dst:%pI4\n", __func__, skb,
 980		 skb->len, &transport->fl.u.ip4.saddr,
 981		 &transport->fl.u.ip4.daddr);
 982
 983	if (transport->dscp & SCTP_DSCP_SET_MASK)
 984		dscp = transport->dscp & SCTP_DSCP_VAL_MASK;
 985
 986	inet->pmtudisc = transport->param_flags & SPP_PMTUD_ENABLE ?
 987			 IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
 988
 989	SCTP_INC_STATS(sock_net(&inet->sk), SCTP_MIB_OUTSCTPPACKS);
 990
 991	return __ip_queue_xmit(&inet->sk, skb, &transport->fl, dscp);
 992}
 993
 994static struct sctp_af sctp_af_inet;
 995
 996static struct sctp_pf sctp_pf_inet = {
 997	.event_msgname = sctp_inet_event_msgname,
 998	.skb_msgname   = sctp_inet_skb_msgname,
 999	.af_supported  = sctp_inet_af_supported,
1000	.cmp_addr      = sctp_inet_cmp_addr,
1001	.bind_verify   = sctp_inet_bind_verify,
1002	.send_verify   = sctp_inet_send_verify,
1003	.supported_addrs = sctp_inet_supported_addrs,
1004	.create_accept_sk = sctp_v4_create_accept_sk,
1005	.addr_to_user  = sctp_v4_addr_to_user,
1006	.to_sk_saddr   = sctp_v4_to_sk_saddr,
1007	.to_sk_daddr   = sctp_v4_to_sk_daddr,
1008	.copy_ip_options = sctp_v4_copy_ip_options,
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	   = sctp_inet_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	.gettstamp	   = sock_gettstamp,
1030	.listen		   = sctp_inet_listen,
1031	.shutdown	   = inet_shutdown,	/* Looks harmless.  */
1032	.setsockopt	   = sock_common_setsockopt, /* IP_SOL IP_OPTION is a problem */
1033	.getsockopt	   = sock_common_getsockopt,
1034	.sendmsg	   = inet_sendmsg,
1035	.recvmsg	   = inet_recvmsg,
1036	.mmap		   = sock_no_mmap,
1037	.sendpage	   = sock_no_sendpage,
1038#ifdef CONFIG_COMPAT
1039	.compat_setsockopt = compat_sock_common_setsockopt,
1040	.compat_getsockopt = compat_sock_common_getsockopt,
1041#endif
1042};
1043
1044/* Registration with AF_INET family.  */
1045static struct inet_protosw sctp_seqpacket_protosw = {
1046	.type       = SOCK_SEQPACKET,
1047	.protocol   = IPPROTO_SCTP,
1048	.prot       = &sctp_prot,
1049	.ops        = &inet_seqpacket_ops,
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	.flags      = SCTP_PROTOSW_FLAG
1058};
1059
1060/* Register with IP layer.  */
1061static const struct net_protocol sctp_protocol = {
1062	.handler     = sctp_rcv,
1063	.err_handler = sctp_v4_err,
1064	.no_policy   = 1,
1065	.netns_ok    = 1,
1066	.icmp_strict_tag_validation = 1,
1067};
1068
1069/* IPv4 address related functions.  */
1070static struct sctp_af sctp_af_inet = {
1071	.sa_family	   = AF_INET,
1072	.sctp_xmit	   = sctp_v4_xmit,
1073	.setsockopt	   = ip_setsockopt,
1074	.getsockopt	   = ip_getsockopt,
1075	.get_dst	   = sctp_v4_get_dst,
1076	.get_saddr	   = sctp_v4_get_saddr,
1077	.copy_addrlist	   = sctp_v4_copy_addrlist,
1078	.from_skb	   = sctp_v4_from_skb,
1079	.from_sk	   = sctp_v4_from_sk,
1080	.from_addr_param   = sctp_v4_from_addr_param,
1081	.to_addr_param	   = sctp_v4_to_addr_param,
1082	.cmp_addr	   = sctp_v4_cmp_addr,
1083	.addr_valid	   = sctp_v4_addr_valid,
1084	.inaddr_any	   = sctp_v4_inaddr_any,
1085	.is_any		   = sctp_v4_is_any,
1086	.available	   = sctp_v4_available,
1087	.scope		   = sctp_v4_scope,
1088	.skb_iif	   = sctp_v4_skb_iif,
1089	.is_ce		   = sctp_v4_is_ce,
1090	.seq_dump_addr	   = sctp_v4_seq_dump_addr,
1091	.ecn_capable	   = sctp_v4_ecn_capable,
1092	.net_header_len	   = sizeof(struct iphdr),
1093	.sockaddr_len	   = sizeof(struct sockaddr_in),
1094	.ip_options_len	   = sctp_v4_ip_options_len,
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(struct net *net)
1134{
1135	net->sctp.sctp_statistics = alloc_percpu(struct sctp_mib);
1136	if (!net->sctp.sctp_statistics)
1137		return -ENOMEM;
1138	return 0;
1139}
1140
1141static inline void cleanup_sctp_mibs(struct net *net)
1142{
1143	free_percpu(net->sctp.sctp_statistics);
1144}
1145
1146static void sctp_v4_pf_init(void)
1147{
1148	/* Initialize the SCTP specific PF functions. */
1149	sctp_register_pf(&sctp_pf_inet, PF_INET);
1150	sctp_register_af(&sctp_af_inet);
1151}
1152
1153static void sctp_v4_pf_exit(void)
1154{
1155	list_del(&sctp_af_inet.list);
1156}
1157
1158static int sctp_v4_protosw_init(void)
1159{
1160	int rc;
1161
1162	rc = proto_register(&sctp_prot, 1);
1163	if (rc)
1164		return rc;
1165
1166	/* Register SCTP(UDP and TCP style) with socket layer.  */
1167	inet_register_protosw(&sctp_seqpacket_protosw);
1168	inet_register_protosw(&sctp_stream_protosw);
1169
1170	return 0;
1171}
1172
1173static void sctp_v4_protosw_exit(void)
1174{
1175	inet_unregister_protosw(&sctp_stream_protosw);
1176	inet_unregister_protosw(&sctp_seqpacket_protosw);
1177	proto_unregister(&sctp_prot);
1178}
1179
1180static int sctp_v4_add_protocol(void)
1181{
1182	/* Register notifier for inet address additions/deletions. */
1183	register_inetaddr_notifier(&sctp_inetaddr_notifier);
1184
1185	/* Register SCTP with inet layer.  */
1186	if (inet_add_protocol(&sctp_protocol, IPPROTO_SCTP) < 0)
1187		return -EAGAIN;
1188
1189	return 0;
1190}
1191
1192static void sctp_v4_del_protocol(void)
1193{
1194	inet_del_protocol(&sctp_protocol, IPPROTO_SCTP);
1195	unregister_inetaddr_notifier(&sctp_inetaddr_notifier);
1196}
1197
1198static int __net_init sctp_defaults_init(struct net *net)
1199{
1200	int status;
1201
1202	/*
1203	 * 14. Suggested SCTP Protocol Parameter Values
1204	 */
1205	/* The following protocol parameters are RECOMMENDED:  */
1206	/* RTO.Initial              - 3  seconds */
1207	net->sctp.rto_initial			= SCTP_RTO_INITIAL;
1208	/* RTO.Min                  - 1  second */
1209	net->sctp.rto_min	 		= SCTP_RTO_MIN;
1210	/* RTO.Max                 -  60 seconds */
1211	net->sctp.rto_max 			= SCTP_RTO_MAX;
1212	/* RTO.Alpha                - 1/8 */
1213	net->sctp.rto_alpha			= SCTP_RTO_ALPHA;
1214	/* RTO.Beta                 - 1/4 */
1215	net->sctp.rto_beta			= SCTP_RTO_BETA;
1216
1217	/* Valid.Cookie.Life        - 60  seconds */
1218	net->sctp.valid_cookie_life		= SCTP_DEFAULT_COOKIE_LIFE;
1219
1220	/* Whether Cookie Preservative is enabled(1) or not(0) */
1221	net->sctp.cookie_preserve_enable 	= 1;
1222
1223	/* Default sctp sockets to use md5 as their hmac alg */
1224#if defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_MD5)
1225	net->sctp.sctp_hmac_alg			= "md5";
1226#elif defined (CONFIG_SCTP_DEFAULT_COOKIE_HMAC_SHA1)
1227	net->sctp.sctp_hmac_alg			= "sha1";
1228#else
1229	net->sctp.sctp_hmac_alg			= NULL;
1230#endif
1231
1232	/* Max.Burst		    - 4 */
1233	net->sctp.max_burst			= SCTP_DEFAULT_MAX_BURST;
1234
1235	/* Disable of Primary Path Switchover by default */
1236	net->sctp.ps_retrans = SCTP_PS_RETRANS_MAX;
1237
1238	/* Enable pf state by default */
1239	net->sctp.pf_enable = 1;
1240
1241	/* Ignore pf exposure feature by default */
1242	net->sctp.pf_expose = SCTP_PF_EXPOSE_UNSET;
1243
1244	/* Association.Max.Retrans  - 10 attempts
1245	 * Path.Max.Retrans         - 5  attempts (per destination address)
1246	 * Max.Init.Retransmits     - 8  attempts
1247	 */
1248	net->sctp.max_retrans_association	= 10;
1249	net->sctp.max_retrans_path		= 5;
1250	net->sctp.max_retrans_init		= 8;
1251
1252	/* Sendbuffer growth	    - do per-socket accounting */
1253	net->sctp.sndbuf_policy			= 0;
1254
1255	/* Rcvbuffer growth	    - do per-socket accounting */
1256	net->sctp.rcvbuf_policy			= 0;
1257
1258	/* HB.interval              - 30 seconds */
1259	net->sctp.hb_interval			= SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
1260
1261	/* delayed SACK timeout */
1262	net->sctp.sack_timeout			= SCTP_DEFAULT_TIMEOUT_SACK;
1263
1264	/* Disable ADDIP by default. */
1265	net->sctp.addip_enable = 0;
1266	net->sctp.addip_noauth = 0;
1267	net->sctp.default_auto_asconf = 0;
1268
1269	/* Enable PR-SCTP by default. */
1270	net->sctp.prsctp_enable = 1;
1271
1272	/* Disable RECONF by default. */
1273	net->sctp.reconf_enable = 0;
1274
1275	/* Disable AUTH by default. */
1276	net->sctp.auth_enable = 0;
1277
1278	/* Enable ECN by default. */
1279	net->sctp.ecn_enable = 1;
1280
1281	/* Set SCOPE policy to enabled */
1282	net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
1283
1284	/* Set the default rwnd update threshold */
1285	net->sctp.rwnd_upd_shift = SCTP_DEFAULT_RWND_SHIFT;
1286
1287	/* Initialize maximum autoclose timeout. */
1288	net->sctp.max_autoclose		= INT_MAX / HZ;
1289
1290	status = sctp_sysctl_net_register(net);
1291	if (status)
1292		goto err_sysctl_register;
1293
1294	/* Allocate and initialise sctp mibs.  */
1295	status = init_sctp_mibs(net);
1296	if (status)
1297		goto err_init_mibs;
1298
1299#ifdef CONFIG_PROC_FS
1300	/* Initialize proc fs directory.  */
1301	status = sctp_proc_init(net);
1302	if (status)
1303		goto err_init_proc;
1304#endif
1305
1306	sctp_dbg_objcnt_init(net);
1307
1308	/* Initialize the local address list. */
1309	INIT_LIST_HEAD(&net->sctp.local_addr_list);
1310	spin_lock_init(&net->sctp.local_addr_lock);
1311	sctp_get_local_addr_list(net);
1312
1313	/* Initialize the address event list */
1314	INIT_LIST_HEAD(&net->sctp.addr_waitq);
1315	INIT_LIST_HEAD(&net->sctp.auto_asconf_splist);
1316	spin_lock_init(&net->sctp.addr_wq_lock);
1317	net->sctp.addr_wq_timer.expires = 0;
1318	timer_setup(&net->sctp.addr_wq_timer, sctp_addr_wq_timeout_handler, 0);
1319
1320	return 0;
1321
1322#ifdef CONFIG_PROC_FS
1323err_init_proc:
1324	cleanup_sctp_mibs(net);
1325#endif
1326err_init_mibs:
1327	sctp_sysctl_net_unregister(net);
1328err_sysctl_register:
1329	return status;
1330}
1331
1332static void __net_exit sctp_defaults_exit(struct net *net)
1333{
1334	/* Free the local address list */
1335	sctp_free_addr_wq(net);
1336	sctp_free_local_addr_list(net);
1337
1338#ifdef CONFIG_PROC_FS
1339	remove_proc_subtree("sctp", net->proc_net);
1340	net->sctp.proc_net_sctp = NULL;
1341#endif
1342	cleanup_sctp_mibs(net);
1343	sctp_sysctl_net_unregister(net);
1344}
1345
1346static struct pernet_operations sctp_defaults_ops = {
1347	.init = sctp_defaults_init,
1348	.exit = sctp_defaults_exit,
1349};
1350
1351static int __net_init sctp_ctrlsock_init(struct net *net)
1352{
1353	int status;
1354
1355	/* Initialize the control inode/socket for handling OOTB packets.  */
1356	status = sctp_ctl_sock_init(net);
1357	if (status)
1358		pr_err("Failed to initialize the SCTP control sock\n");
1359
1360	return status;
1361}
1362
1363static void __net_exit sctp_ctrlsock_exit(struct net *net)
1364{
1365	/* Free the control endpoint.  */
1366	inet_ctl_sock_destroy(net->sctp.ctl_sock);
1367}
1368
1369static struct pernet_operations sctp_ctrlsock_ops = {
1370	.init = sctp_ctrlsock_init,
1371	.exit = sctp_ctrlsock_exit,
1372};
1373
1374/* Initialize the universe into something sensible.  */
1375static __init int sctp_init(void)
1376{
1377	int i;
1378	int status = -EINVAL;
1379	unsigned long goal;
1380	unsigned long limit;
1381	unsigned long nr_pages = totalram_pages();
1382	int max_share;
1383	int order;
1384	int num_entries;
1385	int max_entry_order;
1386
1387	sock_skb_cb_check_size(sizeof(struct sctp_ulpevent));
1388
1389	/* Allocate bind_bucket and chunk caches. */
1390	status = -ENOBUFS;
1391	sctp_bucket_cachep = kmem_cache_create("sctp_bind_bucket",
1392					       sizeof(struct sctp_bind_bucket),
1393					       0, SLAB_HWCACHE_ALIGN,
1394					       NULL);
1395	if (!sctp_bucket_cachep)
1396		goto out;
1397
1398	sctp_chunk_cachep = kmem_cache_create("sctp_chunk",
1399					       sizeof(struct sctp_chunk),
1400					       0, SLAB_HWCACHE_ALIGN,
1401					       NULL);
1402	if (!sctp_chunk_cachep)
1403		goto err_chunk_cachep;
1404
1405	status = percpu_counter_init(&sctp_sockets_allocated, 0, GFP_KERNEL);
1406	if (status)
1407		goto err_percpu_counter_init;
1408
1409	/* Implementation specific variables. */
1410
1411	/* Initialize default stream count setup information. */
1412	sctp_max_instreams    		= SCTP_DEFAULT_INSTREAMS;
1413	sctp_max_outstreams   		= SCTP_DEFAULT_OUTSTREAMS;
1414
1415	/* Initialize handle used for association ids. */
1416	idr_init(&sctp_assocs_id);
1417
1418	limit = nr_free_buffer_pages() / 8;
1419	limit = max(limit, 128UL);
1420	sysctl_sctp_mem[0] = limit / 4 * 3;
1421	sysctl_sctp_mem[1] = limit;
1422	sysctl_sctp_mem[2] = sysctl_sctp_mem[0] * 2;
1423
1424	/* Set per-socket limits to no more than 1/128 the pressure threshold*/
1425	limit = (sysctl_sctp_mem[1]) << (PAGE_SHIFT - 7);
1426	max_share = min(4UL*1024*1024, limit);
1427
1428	sysctl_sctp_rmem[0] = SK_MEM_QUANTUM; /* give each asoc 1 page min */
1429	sysctl_sctp_rmem[1] = 1500 * SKB_TRUESIZE(1);
1430	sysctl_sctp_rmem[2] = max(sysctl_sctp_rmem[1], max_share);
1431
1432	sysctl_sctp_wmem[0] = SK_MEM_QUANTUM;
1433	sysctl_sctp_wmem[1] = 16*1024;
1434	sysctl_sctp_wmem[2] = max(64*1024, max_share);
1435
1436	/* Size and allocate the association hash table.
1437	 * The methodology is similar to that of the tcp hash tables.
1438	 * Though not identical.  Start by getting a goal size
1439	 */
1440	if (nr_pages >= (128 * 1024))
1441		goal = nr_pages >> (22 - PAGE_SHIFT);
1442	else
1443		goal = nr_pages >> (24 - PAGE_SHIFT);
1444
1445	/* Then compute the page order for said goal */
1446	order = get_order(goal);
1447
1448	/* Now compute the required page order for the maximum sized table we
1449	 * want to create
1450	 */
1451	max_entry_order = get_order(MAX_SCTP_PORT_HASH_ENTRIES *
1452				    sizeof(struct sctp_bind_hashbucket));
1453
1454	/* Limit the page order by that maximum hash table size */
1455	order = min(order, max_entry_order);
1456
1457	/* Allocate and initialize the endpoint hash table.  */
1458	sctp_ep_hashsize = 64;
1459	sctp_ep_hashtable =
1460		kmalloc_array(64, sizeof(struct sctp_hashbucket), GFP_KERNEL);
1461	if (!sctp_ep_hashtable) {
1462		pr_err("Failed endpoint_hash alloc\n");
1463		status = -ENOMEM;
1464		goto err_ehash_alloc;
1465	}
1466	for (i = 0; i < sctp_ep_hashsize; i++) {
1467		rwlock_init(&sctp_ep_hashtable[i].lock);
1468		INIT_HLIST_HEAD(&sctp_ep_hashtable[i].chain);
1469	}
1470
1471	/* Allocate and initialize the SCTP port hash table.
1472	 * Note that order is initalized to start at the max sized
1473	 * table we want to support.  If we can't get that many pages
1474	 * reduce the order and try again
1475	 */
1476	do {
1477		sctp_port_hashtable = (struct sctp_bind_hashbucket *)
1478			__get_free_pages(GFP_KERNEL | __GFP_NOWARN, order);
1479	} while (!sctp_port_hashtable && --order > 0);
1480
1481	if (!sctp_port_hashtable) {
1482		pr_err("Failed bind hash alloc\n");
1483		status = -ENOMEM;
1484		goto err_bhash_alloc;
1485	}
1486
1487	/* Now compute the number of entries that will fit in the
1488	 * port hash space we allocated
1489	 */
1490	num_entries = (1UL << order) * PAGE_SIZE /
1491		      sizeof(struct sctp_bind_hashbucket);
1492
1493	/* And finish by rounding it down to the nearest power of two
1494	 * this wastes some memory of course, but its needed because
1495	 * the hash function operates based on the assumption that
1496	 * that the number of entries is a power of two
1497	 */
1498	sctp_port_hashsize = rounddown_pow_of_two(num_entries);
1499
1500	for (i = 0; i < sctp_port_hashsize; i++) {
1501		spin_lock_init(&sctp_port_hashtable[i].lock);
1502		INIT_HLIST_HEAD(&sctp_port_hashtable[i].chain);
1503	}
1504
1505	status = sctp_transport_hashtable_init();
1506	if (status)
1507		goto err_thash_alloc;
1508
1509	pr_info("Hash tables configured (bind %d/%d)\n", sctp_port_hashsize,
1510		num_entries);
1511
1512	sctp_sysctl_register();
1513
1514	INIT_LIST_HEAD(&sctp_address_families);
1515	sctp_v4_pf_init();
1516	sctp_v6_pf_init();
1517	sctp_sched_ops_init();
1518
1519	status = register_pernet_subsys(&sctp_defaults_ops);
1520	if (status)
1521		goto err_register_defaults;
1522
1523	status = sctp_v4_protosw_init();
1524	if (status)
1525		goto err_protosw_init;
1526
1527	status = sctp_v6_protosw_init();
1528	if (status)
1529		goto err_v6_protosw_init;
1530
1531	status = register_pernet_subsys(&sctp_ctrlsock_ops);
1532	if (status)
1533		goto err_register_ctrlsock;
1534
1535	status = sctp_v4_add_protocol();
1536	if (status)
1537		goto err_add_protocol;
1538
1539	/* Register SCTP with inet6 layer.  */
1540	status = sctp_v6_add_protocol();
1541	if (status)
1542		goto err_v6_add_protocol;
1543
1544	if (sctp_offload_init() < 0)
1545		pr_crit("%s: Cannot add SCTP protocol offload\n", __func__);
1546
1547out:
1548	return status;
1549err_v6_add_protocol:
1550	sctp_v4_del_protocol();
1551err_add_protocol:
1552	unregister_pernet_subsys(&sctp_ctrlsock_ops);
1553err_register_ctrlsock:
1554	sctp_v6_protosw_exit();
1555err_v6_protosw_init:
1556	sctp_v4_protosw_exit();
1557err_protosw_init:
1558	unregister_pernet_subsys(&sctp_defaults_ops);
1559err_register_defaults:
1560	sctp_v4_pf_exit();
1561	sctp_v6_pf_exit();
1562	sctp_sysctl_unregister();
1563	free_pages((unsigned long)sctp_port_hashtable,
1564		   get_order(sctp_port_hashsize *
1565			     sizeof(struct sctp_bind_hashbucket)));
1566err_bhash_alloc:
1567	sctp_transport_hashtable_destroy();
1568err_thash_alloc:
1569	kfree(sctp_ep_hashtable);
1570err_ehash_alloc:
1571	percpu_counter_destroy(&sctp_sockets_allocated);
1572err_percpu_counter_init:
1573	kmem_cache_destroy(sctp_chunk_cachep);
1574err_chunk_cachep:
1575	kmem_cache_destroy(sctp_bucket_cachep);
1576	goto out;
1577}
1578
1579/* Exit handler for the SCTP protocol.  */
1580static __exit void sctp_exit(void)
1581{
1582	/* BUG.  This should probably do something useful like clean
1583	 * up all the remaining associations and all that memory.
1584	 */
1585
1586	/* Unregister with inet6/inet layers. */
1587	sctp_v6_del_protocol();
1588	sctp_v4_del_protocol();
1589
1590	unregister_pernet_subsys(&sctp_ctrlsock_ops);
1591
1592	/* Free protosw registrations */
1593	sctp_v6_protosw_exit();
1594	sctp_v4_protosw_exit();
1595
1596	unregister_pernet_subsys(&sctp_defaults_ops);
1597
1598	/* Unregister with socket layer. */
1599	sctp_v6_pf_exit();
1600	sctp_v4_pf_exit();
1601
1602	sctp_sysctl_unregister();
1603
1604	free_pages((unsigned long)sctp_port_hashtable,
1605		   get_order(sctp_port_hashsize *
1606			     sizeof(struct sctp_bind_hashbucket)));
1607	kfree(sctp_ep_hashtable);
1608	sctp_transport_hashtable_destroy();
1609
1610	percpu_counter_destroy(&sctp_sockets_allocated);
1611
1612	rcu_barrier(); /* Wait for completion of call_rcu()'s */
1613
1614	kmem_cache_destroy(sctp_chunk_cachep);
1615	kmem_cache_destroy(sctp_bucket_cachep);
1616}
1617
1618module_init(sctp_init);
1619module_exit(sctp_exit);
1620
1621/*
1622 * __stringify doesn't likes enums, so use IPPROTO_SCTP value (132) directly.
1623 */
1624MODULE_ALIAS("net-pf-" __stringify(PF_INET) "-proto-132");
1625MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-132");
1626MODULE_AUTHOR("Linux Kernel SCTP developers <linux-sctp@vger.kernel.org>");
1627MODULE_DESCRIPTION("Support for the SCTP protocol (RFC2960)");
1628module_param_named(no_checksums, sctp_checksum_disable, bool, 0644);
1629MODULE_PARM_DESC(no_checksums, "Disable checksums computing and verification");
1630MODULE_LICENSE("GPL");